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Casey Schauflere114e472008-02-04 22:29:50 -08001/*
2 * Simplified MAC Kernel (smack) security module
3 *
4 * This file contains the smack hook function implementations.
5 *
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +02006 * Authors:
Casey Schauflere114e472008-02-04 22:29:50 -08007 * Casey Schaufler <casey@schaufler-ca.com>
Jarkko Sakkinen84088ba2011-10-07 09:27:53 +03008 * Jarkko Sakkinen <jarkko.sakkinen@intel.com>
Casey Schauflere114e472008-02-04 22:29:50 -08009 *
10 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
Paul Moore07feee82009-03-27 17:10:54 -040011 * Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
Paul Moore82c21bf2011-08-01 11:10:33 +000012 * Paul Moore <paul@paul-moore.com>
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +020013 * Copyright (C) 2010 Nokia Corporation
Jarkko Sakkinen84088ba2011-10-07 09:27:53 +030014 * Copyright (C) 2011 Intel Corporation.
Casey Schauflere114e472008-02-04 22:29:50 -080015 *
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License version 2,
18 * as published by the Free Software Foundation.
19 */
20
21#include <linux/xattr.h>
22#include <linux/pagemap.h>
23#include <linux/mount.h>
24#include <linux/stat.h>
Casey Schauflere114e472008-02-04 22:29:50 -080025#include <linux/kd.h>
26#include <asm/ioctls.h>
Paul Moore07feee82009-03-27 17:10:54 -040027#include <linux/ip.h>
Casey Schauflere114e472008-02-04 22:29:50 -080028#include <linux/tcp.h>
29#include <linux/udp.h>
Casey Schauflerc6739442013-05-22 18:42:56 -070030#include <linux/dccp.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090031#include <linux/slab.h>
Casey Schauflere114e472008-02-04 22:29:50 -080032#include <linux/mutex.h>
33#include <linux/pipe_fs_i.h>
Casey Schauflere114e472008-02-04 22:29:50 -080034#include <net/cipso_ipv4.h>
Casey Schauflerc6739442013-05-22 18:42:56 -070035#include <net/ip.h>
36#include <net/ipv6.h>
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +100037#include <linux/audit.h>
Nick Black1fd7317d2009-09-22 16:43:33 -070038#include <linux/magic.h>
Eric Paris2a7dba32011-02-01 11:05:39 -050039#include <linux/dcache.h>
Jarkko Sakkinen16014d82011-10-14 13:16:24 +030040#include <linux/personality.h>
Al Viro40401532012-02-13 03:58:52 +000041#include <linux/msg.h>
42#include <linux/shm.h>
43#include <linux/binfmts.h>
Vivek Trivedi3bf27892015-06-22 15:36:06 +053044#include <linux/parser.h>
Casey Schauflere114e472008-02-04 22:29:50 -080045#include "smack.h"
46
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +020047#define TRANS_TRUE "TRUE"
48#define TRANS_TRUE_SIZE 4
49
Casey Schauflerc6739442013-05-22 18:42:56 -070050#define SMK_CONNECTING 0
51#define SMK_RECEIVING 1
52#define SMK_SENDING 2
53
Casey Schaufler21abb1e2015-07-22 14:25:31 -070054#ifdef SMACK_IPV6_PORT_LABELING
Vishal Goel3c7ce342016-11-23 10:31:08 +053055DEFINE_MUTEX(smack_ipv6_lock);
Geliang Tang8b549ef2015-09-27 23:10:25 +080056static LIST_HEAD(smk_ipv6_port_list);
Casey Schaufler21abb1e2015-07-22 14:25:31 -070057#endif
Rohit1a5b4722014-10-15 17:40:41 +053058static struct kmem_cache *smack_inode_cache;
Casey Schaufler69f287a2014-12-12 17:08:40 -080059int smack_enabled;
Casey Schauflerc6739442013-05-22 18:42:56 -070060
Casey Schaufler3d04c922015-08-12 11:56:02 -070061static const match_table_t smk_mount_tokens = {
Vivek Trivedi3bf27892015-06-22 15:36:06 +053062 {Opt_fsdefault, SMK_FSDEFAULT "%s"},
63 {Opt_fsfloor, SMK_FSFLOOR "%s"},
64 {Opt_fshat, SMK_FSHAT "%s"},
65 {Opt_fsroot, SMK_FSROOT "%s"},
66 {Opt_fstransmute, SMK_FSTRANS "%s"},
67 {Opt_error, NULL},
68};
69
Casey Schaufler3d04c922015-08-12 11:56:02 -070070#ifdef CONFIG_SECURITY_SMACK_BRINGUP
71static char *smk_bu_mess[] = {
72 "Bringup Error", /* Unused */
73 "Bringup", /* SMACK_BRINGUP_ALLOW */
74 "Unconfined Subject", /* SMACK_UNCONFINED_SUBJECT */
75 "Unconfined Object", /* SMACK_UNCONFINED_OBJECT */
76};
77
Casey Schauflerd166c802014-08-27 14:51:27 -070078static void smk_bu_mode(int mode, char *s)
79{
80 int i = 0;
81
82 if (mode & MAY_READ)
83 s[i++] = 'r';
84 if (mode & MAY_WRITE)
85 s[i++] = 'w';
86 if (mode & MAY_EXEC)
87 s[i++] = 'x';
88 if (mode & MAY_APPEND)
89 s[i++] = 'a';
90 if (mode & MAY_TRANSMUTE)
91 s[i++] = 't';
92 if (mode & MAY_LOCK)
93 s[i++] = 'l';
94 if (i == 0)
95 s[i++] = '-';
96 s[i] = '\0';
97}
98#endif
99
100#ifdef CONFIG_SECURITY_SMACK_BRINGUP
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +0200101static int smk_bu_note(char *note, struct smack_known *sskp,
102 struct smack_known *oskp, int mode, int rc)
Casey Schauflerd166c802014-08-27 14:51:27 -0700103{
104 char acc[SMK_NUM_ACCESS_TYPE + 1];
105
106 if (rc <= 0)
107 return rc;
Casey Schauflerbf4b2fe2015-03-21 18:26:40 -0700108 if (rc > SMACK_UNCONFINED_OBJECT)
109 rc = 0;
Casey Schauflerd166c802014-08-27 14:51:27 -0700110
111 smk_bu_mode(mode, acc);
Casey Schauflerbf4b2fe2015-03-21 18:26:40 -0700112 pr_info("Smack %s: (%s %s %s) %s\n", smk_bu_mess[rc],
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +0200113 sskp->smk_known, oskp->smk_known, acc, note);
Casey Schauflerd166c802014-08-27 14:51:27 -0700114 return 0;
115}
116#else
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +0200117#define smk_bu_note(note, sskp, oskp, mode, RC) (RC)
Casey Schauflerd166c802014-08-27 14:51:27 -0700118#endif
119
120#ifdef CONFIG_SECURITY_SMACK_BRINGUP
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +0200121static int smk_bu_current(char *note, struct smack_known *oskp,
122 int mode, int rc)
Casey Schauflerd166c802014-08-27 14:51:27 -0700123{
124 struct task_smack *tsp = current_security();
125 char acc[SMK_NUM_ACCESS_TYPE + 1];
126
127 if (rc <= 0)
128 return rc;
Casey Schauflerbf4b2fe2015-03-21 18:26:40 -0700129 if (rc > SMACK_UNCONFINED_OBJECT)
130 rc = 0;
Casey Schauflerd166c802014-08-27 14:51:27 -0700131
132 smk_bu_mode(mode, acc);
Casey Schauflerbf4b2fe2015-03-21 18:26:40 -0700133 pr_info("Smack %s: (%s %s %s) %s %s\n", smk_bu_mess[rc],
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +0200134 tsp->smk_task->smk_known, oskp->smk_known,
135 acc, current->comm, note);
Casey Schauflerd166c802014-08-27 14:51:27 -0700136 return 0;
137}
138#else
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +0200139#define smk_bu_current(note, oskp, mode, RC) (RC)
Casey Schauflerd166c802014-08-27 14:51:27 -0700140#endif
141
142#ifdef CONFIG_SECURITY_SMACK_BRINGUP
143static int smk_bu_task(struct task_struct *otp, int mode, int rc)
144{
145 struct task_smack *tsp = current_security();
Andrey Ryabinin6d1cff22015-01-13 18:52:40 +0300146 struct smack_known *smk_task = smk_of_task_struct(otp);
Casey Schauflerd166c802014-08-27 14:51:27 -0700147 char acc[SMK_NUM_ACCESS_TYPE + 1];
148
149 if (rc <= 0)
150 return rc;
Casey Schauflerbf4b2fe2015-03-21 18:26:40 -0700151 if (rc > SMACK_UNCONFINED_OBJECT)
152 rc = 0;
Casey Schauflerd166c802014-08-27 14:51:27 -0700153
154 smk_bu_mode(mode, acc);
Casey Schauflerbf4b2fe2015-03-21 18:26:40 -0700155 pr_info("Smack %s: (%s %s %s) %s to %s\n", smk_bu_mess[rc],
Andrey Ryabinin6d1cff22015-01-13 18:52:40 +0300156 tsp->smk_task->smk_known, smk_task->smk_known, acc,
Casey Schauflerd166c802014-08-27 14:51:27 -0700157 current->comm, otp->comm);
158 return 0;
159}
160#else
161#define smk_bu_task(otp, mode, RC) (RC)
162#endif
163
164#ifdef CONFIG_SECURITY_SMACK_BRINGUP
165static int smk_bu_inode(struct inode *inode, int mode, int rc)
166{
167 struct task_smack *tsp = current_security();
Casey Schauflerbf4b2fe2015-03-21 18:26:40 -0700168 struct inode_smack *isp = inode->i_security;
Casey Schauflerd166c802014-08-27 14:51:27 -0700169 char acc[SMK_NUM_ACCESS_TYPE + 1];
170
Casey Schauflerbf4b2fe2015-03-21 18:26:40 -0700171 if (isp->smk_flags & SMK_INODE_IMPURE)
172 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
173 inode->i_sb->s_id, inode->i_ino, current->comm);
174
Casey Schauflerd166c802014-08-27 14:51:27 -0700175 if (rc <= 0)
176 return rc;
Casey Schauflerbf4b2fe2015-03-21 18:26:40 -0700177 if (rc > SMACK_UNCONFINED_OBJECT)
178 rc = 0;
179 if (rc == SMACK_UNCONFINED_SUBJECT &&
180 (mode & (MAY_WRITE | MAY_APPEND)))
181 isp->smk_flags |= SMK_INODE_IMPURE;
Casey Schauflerd166c802014-08-27 14:51:27 -0700182
183 smk_bu_mode(mode, acc);
Casey Schauflerbf4b2fe2015-03-21 18:26:40 -0700184
185 pr_info("Smack %s: (%s %s %s) inode=(%s %ld) %s\n", smk_bu_mess[rc],
186 tsp->smk_task->smk_known, isp->smk_inode->smk_known, acc,
Casey Schauflerd166c802014-08-27 14:51:27 -0700187 inode->i_sb->s_id, inode->i_ino, current->comm);
188 return 0;
189}
190#else
191#define smk_bu_inode(inode, mode, RC) (RC)
192#endif
193
194#ifdef CONFIG_SECURITY_SMACK_BRINGUP
195static int smk_bu_file(struct file *file, int mode, int rc)
196{
197 struct task_smack *tsp = current_security();
198 struct smack_known *sskp = tsp->smk_task;
Casey Schaufler5e7270a2014-12-12 17:19:19 -0800199 struct inode *inode = file_inode(file);
Casey Schauflerbf4b2fe2015-03-21 18:26:40 -0700200 struct inode_smack *isp = inode->i_security;
Casey Schauflerd166c802014-08-27 14:51:27 -0700201 char acc[SMK_NUM_ACCESS_TYPE + 1];
202
Casey Schauflerbf4b2fe2015-03-21 18:26:40 -0700203 if (isp->smk_flags & SMK_INODE_IMPURE)
204 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
205 inode->i_sb->s_id, inode->i_ino, current->comm);
206
Casey Schauflerd166c802014-08-27 14:51:27 -0700207 if (rc <= 0)
208 return rc;
Casey Schauflerbf4b2fe2015-03-21 18:26:40 -0700209 if (rc > SMACK_UNCONFINED_OBJECT)
210 rc = 0;
Casey Schauflerd166c802014-08-27 14:51:27 -0700211
212 smk_bu_mode(mode, acc);
Casey Schauflerbf4b2fe2015-03-21 18:26:40 -0700213 pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc],
Casey Schaufler5e7270a2014-12-12 17:19:19 -0800214 sskp->smk_known, smk_of_inode(inode)->smk_known, acc,
Al Viroa4555892014-10-21 20:11:25 -0400215 inode->i_sb->s_id, inode->i_ino, file,
Casey Schauflerd166c802014-08-27 14:51:27 -0700216 current->comm);
217 return 0;
218}
219#else
220#define smk_bu_file(file, mode, RC) (RC)
221#endif
222
223#ifdef CONFIG_SECURITY_SMACK_BRINGUP
224static int smk_bu_credfile(const struct cred *cred, struct file *file,
225 int mode, int rc)
226{
227 struct task_smack *tsp = cred->security;
228 struct smack_known *sskp = tsp->smk_task;
Al Viro45063092016-12-04 18:24:56 -0500229 struct inode *inode = file_inode(file);
Casey Schauflerbf4b2fe2015-03-21 18:26:40 -0700230 struct inode_smack *isp = inode->i_security;
Casey Schauflerd166c802014-08-27 14:51:27 -0700231 char acc[SMK_NUM_ACCESS_TYPE + 1];
232
Casey Schauflerbf4b2fe2015-03-21 18:26:40 -0700233 if (isp->smk_flags & SMK_INODE_IMPURE)
234 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
235 inode->i_sb->s_id, inode->i_ino, current->comm);
236
Casey Schauflerd166c802014-08-27 14:51:27 -0700237 if (rc <= 0)
238 return rc;
Casey Schauflerbf4b2fe2015-03-21 18:26:40 -0700239 if (rc > SMACK_UNCONFINED_OBJECT)
240 rc = 0;
Casey Schauflerd166c802014-08-27 14:51:27 -0700241
242 smk_bu_mode(mode, acc);
Casey Schauflerbf4b2fe2015-03-21 18:26:40 -0700243 pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc],
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +0200244 sskp->smk_known, smk_of_inode(inode)->smk_known, acc,
Al Viroa4555892014-10-21 20:11:25 -0400245 inode->i_sb->s_id, inode->i_ino, file,
Casey Schauflerd166c802014-08-27 14:51:27 -0700246 current->comm);
247 return 0;
248}
249#else
250#define smk_bu_credfile(cred, file, mode, RC) (RC)
251#endif
252
Casey Schauflere114e472008-02-04 22:29:50 -0800253/**
254 * smk_fetch - Fetch the smack label from a file.
Lukasz Pawelczyk1a289792014-11-26 15:31:06 +0100255 * @name: type of the label (attribute)
Casey Schauflere114e472008-02-04 22:29:50 -0800256 * @ip: a pointer to the inode
257 * @dp: a pointer to the dentry
258 *
Lukasz Pawelczyke774ad62015-04-20 17:12:54 +0200259 * Returns a pointer to the master list entry for the Smack label,
260 * NULL if there was no label to fetch, or an error code.
Casey Schauflere114e472008-02-04 22:29:50 -0800261 */
Casey Schaufler2f823ff2013-05-22 18:43:03 -0700262static struct smack_known *smk_fetch(const char *name, struct inode *ip,
263 struct dentry *dp)
Casey Schauflere114e472008-02-04 22:29:50 -0800264{
265 int rc;
Casey Schauflerf7112e62012-05-06 15:22:02 -0700266 char *buffer;
Casey Schaufler2f823ff2013-05-22 18:43:03 -0700267 struct smack_known *skp = NULL;
Casey Schauflere114e472008-02-04 22:29:50 -0800268
Andreas Gruenbacher5d6c3192016-09-29 17:48:42 +0200269 if (!(ip->i_opflags & IOP_XATTR))
Lukasz Pawelczyke774ad62015-04-20 17:12:54 +0200270 return ERR_PTR(-EOPNOTSUPP);
Casey Schauflere114e472008-02-04 22:29:50 -0800271
Casey Schauflerf7112e62012-05-06 15:22:02 -0700272 buffer = kzalloc(SMK_LONGLABEL, GFP_KERNEL);
273 if (buffer == NULL)
Lukasz Pawelczyke774ad62015-04-20 17:12:54 +0200274 return ERR_PTR(-ENOMEM);
Casey Schauflere114e472008-02-04 22:29:50 -0800275
Andreas Gruenbacher5d6c3192016-09-29 17:48:42 +0200276 rc = __vfs_getxattr(dp, ip, name, buffer, SMK_LONGLABEL);
Lukasz Pawelczyke774ad62015-04-20 17:12:54 +0200277 if (rc < 0)
278 skp = ERR_PTR(rc);
279 else if (rc == 0)
280 skp = NULL;
281 else
Casey Schaufler2f823ff2013-05-22 18:43:03 -0700282 skp = smk_import_entry(buffer, rc);
Casey Schauflerf7112e62012-05-06 15:22:02 -0700283
284 kfree(buffer);
285
Casey Schaufler2f823ff2013-05-22 18:43:03 -0700286 return skp;
Casey Schauflere114e472008-02-04 22:29:50 -0800287}
288
289/**
290 * new_inode_smack - allocate an inode security blob
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +0200291 * @skp: a pointer to the Smack label entry to use in the blob
Casey Schauflere114e472008-02-04 22:29:50 -0800292 *
293 * Returns the new blob or NULL if there's no memory available
294 */
Casey Schaufler1eddfe82015-07-30 14:35:14 -0700295static struct inode_smack *new_inode_smack(struct smack_known *skp)
Casey Schauflere114e472008-02-04 22:29:50 -0800296{
297 struct inode_smack *isp;
298
Rohit1a5b4722014-10-15 17:40:41 +0530299 isp = kmem_cache_zalloc(smack_inode_cache, GFP_NOFS);
Casey Schauflere114e472008-02-04 22:29:50 -0800300 if (isp == NULL)
301 return NULL;
302
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +0200303 isp->smk_inode = skp;
Casey Schauflere114e472008-02-04 22:29:50 -0800304 isp->smk_flags = 0;
305 mutex_init(&isp->smk_lock);
306
307 return isp;
308}
309
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800310/**
311 * new_task_smack - allocate a task security blob
Lukasz Pawelczyk1a289792014-11-26 15:31:06 +0100312 * @task: a pointer to the Smack label for the running task
313 * @forked: a pointer to the Smack label for the forked task
314 * @gfp: type of the memory for the allocation
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800315 *
316 * Returns the new blob or NULL if there's no memory available
317 */
Casey Schaufler2f823ff2013-05-22 18:43:03 -0700318static struct task_smack *new_task_smack(struct smack_known *task,
319 struct smack_known *forked, gfp_t gfp)
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800320{
321 struct task_smack *tsp;
322
323 tsp = kzalloc(sizeof(struct task_smack), gfp);
324 if (tsp == NULL)
325 return NULL;
326
327 tsp->smk_task = task;
328 tsp->smk_forked = forked;
329 INIT_LIST_HEAD(&tsp->smk_rules);
Zbigniew Jasinski38416e52015-10-19 18:23:53 +0200330 INIT_LIST_HEAD(&tsp->smk_relabel);
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800331 mutex_init(&tsp->smk_rules_lock);
332
333 return tsp;
334}
335
336/**
337 * smk_copy_rules - copy a rule set
Lukasz Pawelczyk1a289792014-11-26 15:31:06 +0100338 * @nhead: new rules header pointer
339 * @ohead: old rules header pointer
340 * @gfp: type of the memory for the allocation
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800341 *
342 * Returns 0 on success, -ENOMEM on error
343 */
344static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead,
345 gfp_t gfp)
346{
347 struct smack_rule *nrp;
348 struct smack_rule *orp;
349 int rc = 0;
350
Casey Schaufler7898e1f2011-01-17 08:05:27 -0800351 list_for_each_entry_rcu(orp, ohead, list) {
352 nrp = kzalloc(sizeof(struct smack_rule), gfp);
353 if (nrp == NULL) {
354 rc = -ENOMEM;
355 break;
356 }
357 *nrp = *orp;
358 list_add_rcu(&nrp->list, nhead);
359 }
360 return rc;
361}
362
Lukasz Pawelczyk56638842014-03-11 17:07:05 +0100363/**
Zbigniew Jasinski38416e52015-10-19 18:23:53 +0200364 * smk_copy_relabel - copy smk_relabel labels list
365 * @nhead: new rules header pointer
366 * @ohead: old rules header pointer
367 * @gfp: type of the memory for the allocation
368 *
369 * Returns 0 on success, -ENOMEM on error
370 */
371static int smk_copy_relabel(struct list_head *nhead, struct list_head *ohead,
372 gfp_t gfp)
373{
374 struct smack_known_list_elem *nklep;
375 struct smack_known_list_elem *oklep;
376
Zbigniew Jasinski38416e52015-10-19 18:23:53 +0200377 list_for_each_entry(oklep, ohead, list) {
378 nklep = kzalloc(sizeof(struct smack_known_list_elem), gfp);
379 if (nklep == NULL) {
380 smk_destroy_label_list(nhead);
381 return -ENOMEM;
382 }
383 nklep->smk_label = oklep->smk_label;
384 list_add(&nklep->list, nhead);
385 }
386
387 return 0;
388}
389
390/**
Lukasz Pawelczyk56638842014-03-11 17:07:05 +0100391 * smk_ptrace_mode - helper function for converting PTRACE_MODE_* into MAY_*
392 * @mode - input mode in form of PTRACE_MODE_*
393 *
394 * Returns a converted MAY_* mode usable by smack rules
395 */
396static inline unsigned int smk_ptrace_mode(unsigned int mode)
397{
Jann Horn3dfb7d82016-01-20 15:00:01 -0800398 if (mode & PTRACE_MODE_ATTACH)
Lukasz Pawelczyk56638842014-03-11 17:07:05 +0100399 return MAY_READWRITE;
Jann Horn3dfb7d82016-01-20 15:00:01 -0800400 if (mode & PTRACE_MODE_READ)
401 return MAY_READ;
Lukasz Pawelczyk56638842014-03-11 17:07:05 +0100402
403 return 0;
404}
405
406/**
407 * smk_ptrace_rule_check - helper for ptrace access
408 * @tracer: tracer process
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +0200409 * @tracee_known: label entry of the process that's about to be traced
Lukasz Pawelczyk56638842014-03-11 17:07:05 +0100410 * @mode: ptrace attachment mode (PTRACE_MODE_*)
411 * @func: name of the function that called us, used for audit
412 *
413 * Returns 0 on access granted, -error on error
414 */
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +0200415static int smk_ptrace_rule_check(struct task_struct *tracer,
416 struct smack_known *tracee_known,
Lukasz Pawelczyk56638842014-03-11 17:07:05 +0100417 unsigned int mode, const char *func)
418{
419 int rc;
420 struct smk_audit_info ad, *saip = NULL;
421 struct task_smack *tsp;
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +0200422 struct smack_known *tracer_known;
Lukasz Pawelczyk56638842014-03-11 17:07:05 +0100423
424 if ((mode & PTRACE_MODE_NOAUDIT) == 0) {
425 smk_ad_init(&ad, func, LSM_AUDIT_DATA_TASK);
426 smk_ad_setfield_u_tsk(&ad, tracer);
427 saip = &ad;
428 }
429
Andrey Ryabinin6d1cff22015-01-13 18:52:40 +0300430 rcu_read_lock();
431 tsp = __task_cred(tracer)->security;
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +0200432 tracer_known = smk_of_task(tsp);
Lukasz Pawelczyk56638842014-03-11 17:07:05 +0100433
Lukasz Pawelczyk66867812014-03-11 17:07:06 +0100434 if ((mode & PTRACE_MODE_ATTACH) &&
435 (smack_ptrace_rule == SMACK_PTRACE_EXACT ||
436 smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)) {
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +0200437 if (tracer_known->smk_known == tracee_known->smk_known)
Lukasz Pawelczyk66867812014-03-11 17:07:06 +0100438 rc = 0;
439 else if (smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)
440 rc = -EACCES;
441 else if (capable(CAP_SYS_PTRACE))
442 rc = 0;
443 else
444 rc = -EACCES;
445
446 if (saip)
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +0200447 smack_log(tracer_known->smk_known,
448 tracee_known->smk_known,
449 0, rc, saip);
Lukasz Pawelczyk66867812014-03-11 17:07:06 +0100450
Andrey Ryabinin6d1cff22015-01-13 18:52:40 +0300451 rcu_read_unlock();
Lukasz Pawelczyk66867812014-03-11 17:07:06 +0100452 return rc;
453 }
454
455 /* In case of rule==SMACK_PTRACE_DEFAULT or mode==PTRACE_MODE_READ */
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +0200456 rc = smk_tskacc(tsp, tracee_known, smk_ptrace_mode(mode), saip);
Andrey Ryabinin6d1cff22015-01-13 18:52:40 +0300457
458 rcu_read_unlock();
Lukasz Pawelczyk56638842014-03-11 17:07:05 +0100459 return rc;
460}
461
Casey Schauflere114e472008-02-04 22:29:50 -0800462/*
463 * LSM hooks.
464 * We he, that is fun!
465 */
466
467/**
Ingo Molnar9e488582009-05-07 19:26:19 +1000468 * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH
Casey Schauflere114e472008-02-04 22:29:50 -0800469 * @ctp: child task pointer
Lukasz Pawelczyk56638842014-03-11 17:07:05 +0100470 * @mode: ptrace attachment mode (PTRACE_MODE_*)
Casey Schauflere114e472008-02-04 22:29:50 -0800471 *
472 * Returns 0 if access is OK, an error code otherwise
473 *
Lukasz Pawelczyk56638842014-03-11 17:07:05 +0100474 * Do the capability checks.
Casey Schauflere114e472008-02-04 22:29:50 -0800475 */
Ingo Molnar9e488582009-05-07 19:26:19 +1000476static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode)
Casey Schauflere114e472008-02-04 22:29:50 -0800477{
Casey Schaufler2f823ff2013-05-22 18:43:03 -0700478 struct smack_known *skp;
Casey Schauflere114e472008-02-04 22:29:50 -0800479
Andrey Ryabinin6d1cff22015-01-13 18:52:40 +0300480 skp = smk_of_task_struct(ctp);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200481
Casey Schauflerb1d9e6b2015-05-02 15:11:42 -0700482 return smk_ptrace_rule_check(current, skp, mode, __func__);
David Howells5cd9c582008-08-14 11:37:28 +0100483}
Casey Schauflere114e472008-02-04 22:29:50 -0800484
David Howells5cd9c582008-08-14 11:37:28 +0100485/**
486 * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
487 * @ptp: parent task pointer
488 *
489 * Returns 0 if access is OK, an error code otherwise
490 *
Lukasz Pawelczyk56638842014-03-11 17:07:05 +0100491 * Do the capability checks, and require PTRACE_MODE_ATTACH.
David Howells5cd9c582008-08-14 11:37:28 +0100492 */
493static int smack_ptrace_traceme(struct task_struct *ptp)
494{
495 int rc;
Casey Schaufler2f823ff2013-05-22 18:43:03 -0700496 struct smack_known *skp;
David Howells5cd9c582008-08-14 11:37:28 +0100497
Lukasz Pawelczyk959e6c72014-03-11 17:07:04 +0100498 skp = smk_of_task(current_security());
Etienne Bassetecfcc532009-04-08 20:40:06 +0200499
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +0200500 rc = smk_ptrace_rule_check(ptp, skp, PTRACE_MODE_ATTACH, __func__);
Casey Schauflere114e472008-02-04 22:29:50 -0800501 return rc;
502}
503
504/**
505 * smack_syslog - Smack approval on syslog
506 * @type: message type
507 *
Casey Schauflere114e472008-02-04 22:29:50 -0800508 * Returns 0 on success, error code otherwise.
509 */
Eric Paris12b30522010-11-15 18:36:29 -0500510static int smack_syslog(int typefrom_file)
Casey Schauflere114e472008-02-04 22:29:50 -0800511{
Eric Paris12b30522010-11-15 18:36:29 -0500512 int rc = 0;
Casey Schaufler2f823ff2013-05-22 18:43:03 -0700513 struct smack_known *skp = smk_of_current();
Casey Schauflere114e472008-02-04 22:29:50 -0800514
Casey Schaufler1880eff2012-06-05 15:28:30 -0700515 if (smack_privileged(CAP_MAC_OVERRIDE))
Casey Schauflere114e472008-02-04 22:29:50 -0800516 return 0;
517
Casey Schaufler24ea1b62013-12-30 09:38:00 -0800518 if (smack_syslog_label != NULL && smack_syslog_label != skp)
Casey Schauflere114e472008-02-04 22:29:50 -0800519 rc = -EACCES;
520
521 return rc;
522}
523
524
525/*
526 * Superblock Hooks.
527 */
528
529/**
530 * smack_sb_alloc_security - allocate a superblock blob
531 * @sb: the superblock getting the blob
532 *
533 * Returns 0 on success or -ENOMEM on error.
534 */
535static int smack_sb_alloc_security(struct super_block *sb)
536{
537 struct superblock_smack *sbsp;
538
539 sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL);
540
541 if (sbsp == NULL)
542 return -ENOMEM;
543
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +0200544 sbsp->smk_root = &smack_known_floor;
545 sbsp->smk_default = &smack_known_floor;
546 sbsp->smk_floor = &smack_known_floor;
547 sbsp->smk_hat = &smack_known_hat;
Casey Schauflere830b392013-05-22 18:43:07 -0700548 /*
Seth Forshee9f50eda2015-09-23 15:16:06 -0500549 * SMK_SB_INITIALIZED will be zero from kzalloc.
Casey Schauflere830b392013-05-22 18:43:07 -0700550 */
Casey Schauflere114e472008-02-04 22:29:50 -0800551 sb->s_security = sbsp;
552
553 return 0;
554}
555
556/**
557 * smack_sb_free_security - free a superblock blob
558 * @sb: the superblock getting the blob
559 *
560 */
561static void smack_sb_free_security(struct super_block *sb)
562{
563 kfree(sb->s_security);
564 sb->s_security = NULL;
565}
566
567/**
568 * smack_sb_copy_data - copy mount options data for processing
Casey Schauflere114e472008-02-04 22:29:50 -0800569 * @orig: where to start
Randy Dunlap251a2a92009-02-18 11:42:33 -0800570 * @smackopts: mount options string
Casey Schauflere114e472008-02-04 22:29:50 -0800571 *
572 * Returns 0 on success or -ENOMEM on error.
573 *
574 * Copy the Smack specific mount options out of the mount
575 * options list.
576 */
Eric Parise0007522008-03-05 10:31:54 -0500577static int smack_sb_copy_data(char *orig, char *smackopts)
Casey Schauflere114e472008-02-04 22:29:50 -0800578{
579 char *cp, *commap, *otheropts, *dp;
580
Casey Schauflere114e472008-02-04 22:29:50 -0800581 otheropts = (char *)get_zeroed_page(GFP_KERNEL);
582 if (otheropts == NULL)
583 return -ENOMEM;
584
585 for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) {
586 if (strstr(cp, SMK_FSDEFAULT) == cp)
587 dp = smackopts;
588 else if (strstr(cp, SMK_FSFLOOR) == cp)
589 dp = smackopts;
590 else if (strstr(cp, SMK_FSHAT) == cp)
591 dp = smackopts;
592 else if (strstr(cp, SMK_FSROOT) == cp)
593 dp = smackopts;
Casey Schauflere830b392013-05-22 18:43:07 -0700594 else if (strstr(cp, SMK_FSTRANS) == cp)
595 dp = smackopts;
Casey Schauflere114e472008-02-04 22:29:50 -0800596 else
597 dp = otheropts;
598
599 commap = strchr(cp, ',');
600 if (commap != NULL)
601 *commap = '\0';
602
603 if (*dp != '\0')
604 strcat(dp, ",");
605 strcat(dp, cp);
606 }
607
608 strcpy(orig, otheropts);
609 free_page((unsigned long)otheropts);
610
611 return 0;
612}
613
614/**
Vivek Trivedi3bf27892015-06-22 15:36:06 +0530615 * smack_parse_opts_str - parse Smack specific mount options
616 * @options: mount options string
617 * @opts: where to store converted mount opts
618 *
619 * Returns 0 on success or -ENOMEM on error.
620 *
621 * converts Smack specific mount options to generic security option format
622 */
623static int smack_parse_opts_str(char *options,
624 struct security_mnt_opts *opts)
625{
626 char *p;
Casey Schaufler3d04c922015-08-12 11:56:02 -0700627 char *fsdefault = NULL;
628 char *fsfloor = NULL;
629 char *fshat = NULL;
630 char *fsroot = NULL;
631 char *fstransmute = NULL;
632 int rc = -ENOMEM;
633 int num_mnt_opts = 0;
634 int token;
Vivek Trivedi3bf27892015-06-22 15:36:06 +0530635
636 opts->num_mnt_opts = 0;
637
638 if (!options)
639 return 0;
640
641 while ((p = strsep(&options, ",")) != NULL) {
Vivek Trivedi3bf27892015-06-22 15:36:06 +0530642 substring_t args[MAX_OPT_ARGS];
643
644 if (!*p)
645 continue;
646
Casey Schaufler3d04c922015-08-12 11:56:02 -0700647 token = match_token(p, smk_mount_tokens, args);
Vivek Trivedi3bf27892015-06-22 15:36:06 +0530648
649 switch (token) {
650 case Opt_fsdefault:
651 if (fsdefault)
652 goto out_opt_err;
653 fsdefault = match_strdup(&args[0]);
654 if (!fsdefault)
655 goto out_err;
656 break;
657 case Opt_fsfloor:
658 if (fsfloor)
659 goto out_opt_err;
660 fsfloor = match_strdup(&args[0]);
661 if (!fsfloor)
662 goto out_err;
663 break;
664 case Opt_fshat:
665 if (fshat)
666 goto out_opt_err;
667 fshat = match_strdup(&args[0]);
668 if (!fshat)
669 goto out_err;
670 break;
671 case Opt_fsroot:
672 if (fsroot)
673 goto out_opt_err;
674 fsroot = match_strdup(&args[0]);
675 if (!fsroot)
676 goto out_err;
677 break;
678 case Opt_fstransmute:
679 if (fstransmute)
680 goto out_opt_err;
681 fstransmute = match_strdup(&args[0]);
682 if (!fstransmute)
683 goto out_err;
684 break;
685 default:
686 rc = -EINVAL;
687 pr_warn("Smack: unknown mount option\n");
688 goto out_err;
689 }
690 }
691
Tetsuo Handa8c15d662016-11-14 20:12:55 +0900692 opts->mnt_opts = kcalloc(NUM_SMK_MNT_OPTS, sizeof(char *), GFP_KERNEL);
Vivek Trivedi3bf27892015-06-22 15:36:06 +0530693 if (!opts->mnt_opts)
694 goto out_err;
695
696 opts->mnt_opts_flags = kcalloc(NUM_SMK_MNT_OPTS, sizeof(int),
Tetsuo Handa8c15d662016-11-14 20:12:55 +0900697 GFP_KERNEL);
Tetsuo Handac3c8dc92017-03-24 20:42:05 +0900698 if (!opts->mnt_opts_flags)
Vivek Trivedi3bf27892015-06-22 15:36:06 +0530699 goto out_err;
Vivek Trivedi3bf27892015-06-22 15:36:06 +0530700
701 if (fsdefault) {
702 opts->mnt_opts[num_mnt_opts] = fsdefault;
703 opts->mnt_opts_flags[num_mnt_opts++] = FSDEFAULT_MNT;
704 }
705 if (fsfloor) {
706 opts->mnt_opts[num_mnt_opts] = fsfloor;
707 opts->mnt_opts_flags[num_mnt_opts++] = FSFLOOR_MNT;
708 }
709 if (fshat) {
710 opts->mnt_opts[num_mnt_opts] = fshat;
711 opts->mnt_opts_flags[num_mnt_opts++] = FSHAT_MNT;
712 }
713 if (fsroot) {
714 opts->mnt_opts[num_mnt_opts] = fsroot;
715 opts->mnt_opts_flags[num_mnt_opts++] = FSROOT_MNT;
716 }
717 if (fstransmute) {
718 opts->mnt_opts[num_mnt_opts] = fstransmute;
719 opts->mnt_opts_flags[num_mnt_opts++] = FSTRANS_MNT;
720 }
721
722 opts->num_mnt_opts = num_mnt_opts;
723 return 0;
724
725out_opt_err:
726 rc = -EINVAL;
727 pr_warn("Smack: duplicate mount options\n");
728
729out_err:
730 kfree(fsdefault);
731 kfree(fsfloor);
732 kfree(fshat);
733 kfree(fsroot);
734 kfree(fstransmute);
735 return rc;
736}
737
738/**
739 * smack_set_mnt_opts - set Smack specific mount options
Casey Schauflere114e472008-02-04 22:29:50 -0800740 * @sb: the file system superblock
Vivek Trivedi3bf27892015-06-22 15:36:06 +0530741 * @opts: Smack mount options
742 * @kern_flags: mount option from kernel space or user space
743 * @set_kern_flags: where to store converted mount opts
Casey Schauflere114e472008-02-04 22:29:50 -0800744 *
745 * Returns 0 on success, an error code on failure
Vivek Trivedi3bf27892015-06-22 15:36:06 +0530746 *
747 * Allow filesystems with binary mount data to explicitly set Smack mount
748 * labels.
Casey Schauflere114e472008-02-04 22:29:50 -0800749 */
Vivek Trivedi3bf27892015-06-22 15:36:06 +0530750static int smack_set_mnt_opts(struct super_block *sb,
751 struct security_mnt_opts *opts,
752 unsigned long kern_flags,
753 unsigned long *set_kern_flags)
Casey Schauflere114e472008-02-04 22:29:50 -0800754{
755 struct dentry *root = sb->s_root;
David Howellsc6f493d2015-03-17 22:26:22 +0000756 struct inode *inode = d_backing_inode(root);
Casey Schauflere114e472008-02-04 22:29:50 -0800757 struct superblock_smack *sp = sb->s_security;
758 struct inode_smack *isp;
Casey Schaufler24ea1b62013-12-30 09:38:00 -0800759 struct smack_known *skp;
Vivek Trivedi3bf27892015-06-22 15:36:06 +0530760 int i;
761 int num_opts = opts->num_mnt_opts;
Casey Schauflere830b392013-05-22 18:43:07 -0700762 int transmute = 0;
Casey Schauflere114e472008-02-04 22:29:50 -0800763
Seth Forshee9f50eda2015-09-23 15:16:06 -0500764 if (sp->smk_flags & SMK_SB_INITIALIZED)
Casey Schauflere114e472008-02-04 22:29:50 -0800765 return 0;
Casey Schauflereb982cb2012-05-23 17:46:58 -0700766
Himanshu Shukla2097f592016-11-10 16:19:52 +0530767 if (!smack_privileged(CAP_MAC_ADMIN)) {
768 /*
769 * Unprivileged mounts don't get to specify Smack values.
770 */
771 if (num_opts)
772 return -EPERM;
773 /*
774 * Unprivileged mounts get root and default from the caller.
775 */
776 skp = smk_of_current();
777 sp->smk_root = skp;
778 sp->smk_default = skp;
779 /*
780 * For a handful of fs types with no user-controlled
781 * backing store it's okay to trust security labels
782 * in the filesystem. The rest are untrusted.
783 */
784 if (sb->s_user_ns != &init_user_ns &&
785 sb->s_magic != SYSFS_MAGIC && sb->s_magic != TMPFS_MAGIC &&
786 sb->s_magic != RAMFS_MAGIC) {
787 transmute = 1;
788 sp->smk_flags |= SMK_SB_UNTRUSTED;
789 }
790 }
791
Seth Forshee9f50eda2015-09-23 15:16:06 -0500792 sp->smk_flags |= SMK_SB_INITIALIZED;
Casey Schauflere114e472008-02-04 22:29:50 -0800793
Vivek Trivedi3bf27892015-06-22 15:36:06 +0530794 for (i = 0; i < num_opts; i++) {
795 switch (opts->mnt_opts_flags[i]) {
796 case FSDEFAULT_MNT:
797 skp = smk_import_entry(opts->mnt_opts[i], 0);
Lukasz Pawelczyke774ad62015-04-20 17:12:54 +0200798 if (IS_ERR(skp))
799 return PTR_ERR(skp);
800 sp->smk_default = skp;
Vivek Trivedi3bf27892015-06-22 15:36:06 +0530801 break;
802 case FSFLOOR_MNT:
803 skp = smk_import_entry(opts->mnt_opts[i], 0);
804 if (IS_ERR(skp))
805 return PTR_ERR(skp);
806 sp->smk_floor = skp;
807 break;
808 case FSHAT_MNT:
809 skp = smk_import_entry(opts->mnt_opts[i], 0);
810 if (IS_ERR(skp))
811 return PTR_ERR(skp);
812 sp->smk_hat = skp;
813 break;
814 case FSROOT_MNT:
815 skp = smk_import_entry(opts->mnt_opts[i], 0);
Lukasz Pawelczyke774ad62015-04-20 17:12:54 +0200816 if (IS_ERR(skp))
817 return PTR_ERR(skp);
818 sp->smk_root = skp;
Vivek Trivedi3bf27892015-06-22 15:36:06 +0530819 break;
820 case FSTRANS_MNT:
821 skp = smk_import_entry(opts->mnt_opts[i], 0);
Lukasz Pawelczyke774ad62015-04-20 17:12:54 +0200822 if (IS_ERR(skp))
823 return PTR_ERR(skp);
824 sp->smk_root = skp;
825 transmute = 1;
Vivek Trivedi3bf27892015-06-22 15:36:06 +0530826 break;
827 default:
828 break;
Casey Schauflere114e472008-02-04 22:29:50 -0800829 }
830 }
831
832 /*
833 * Initialize the root inode.
834 */
835 isp = inode->i_security;
José Bollo55dfc5d2014-01-08 15:53:05 +0100836 if (isp == NULL) {
837 isp = new_inode_smack(sp->smk_root);
838 if (isp == NULL)
839 return -ENOMEM;
840 inode->i_security = isp;
Casey Schauflere830b392013-05-22 18:43:07 -0700841 } else
Casey Schauflere114e472008-02-04 22:29:50 -0800842 isp->smk_inode = sp->smk_root;
843
Casey Schauflere830b392013-05-22 18:43:07 -0700844 if (transmute)
845 isp->smk_flags |= SMK_INODE_TRANSMUTE;
846
Casey Schauflere114e472008-02-04 22:29:50 -0800847 return 0;
848}
849
850/**
Vivek Trivedi3bf27892015-06-22 15:36:06 +0530851 * smack_sb_kern_mount - Smack specific mount processing
852 * @sb: the file system superblock
853 * @flags: the mount flags
854 * @data: the smack mount options
855 *
856 * Returns 0 on success, an error code on failure
857 */
858static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data)
859{
860 int rc = 0;
861 char *options = data;
862 struct security_mnt_opts opts;
863
864 security_init_mnt_opts(&opts);
865
866 if (!options)
867 goto out;
868
869 rc = smack_parse_opts_str(options, &opts);
870 if (rc)
871 goto out_err;
872
873out:
874 rc = smack_set_mnt_opts(sb, &opts, 0, NULL);
875
876out_err:
877 security_free_mnt_opts(&opts);
878 return rc;
879}
880
881/**
Casey Schauflere114e472008-02-04 22:29:50 -0800882 * smack_sb_statfs - Smack check on statfs
883 * @dentry: identifies the file system in question
884 *
885 * Returns 0 if current can read the floor of the filesystem,
886 * and error code otherwise
887 */
888static int smack_sb_statfs(struct dentry *dentry)
889{
890 struct superblock_smack *sbp = dentry->d_sb->s_security;
Etienne Bassetecfcc532009-04-08 20:40:06 +0200891 int rc;
892 struct smk_audit_info ad;
Casey Schauflere114e472008-02-04 22:29:50 -0800893
Eric Parisa2694342011-04-25 13:10:27 -0400894 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200895 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
896
897 rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad);
Casey Schauflerd166c802014-08-27 14:51:27 -0700898 rc = smk_bu_current("statfs", sbp->smk_floor, MAY_READ, rc);
Etienne Bassetecfcc532009-04-08 20:40:06 +0200899 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -0800900}
901
Casey Schauflere114e472008-02-04 22:29:50 -0800902/*
Casey Schaufler676dac42010-12-02 06:43:39 -0800903 * BPRM hooks
904 */
905
Casey Schauflerce8a4322011-09-29 18:21:01 -0700906/**
907 * smack_bprm_set_creds - set creds for exec
908 * @bprm: the exec information
909 *
Lukasz Pawelczyk56638842014-03-11 17:07:05 +0100910 * Returns 0 if it gets a blob, -EPERM if exec forbidden and -ENOMEM otherwise
Casey Schauflerce8a4322011-09-29 18:21:01 -0700911 */
Casey Schaufler676dac42010-12-02 06:43:39 -0800912static int smack_bprm_set_creds(struct linux_binprm *bprm)
913{
Al Viro496ad9a2013-01-23 17:07:38 -0500914 struct inode *inode = file_inode(bprm->file);
Jarkko Sakkinen84088ba2011-10-07 09:27:53 +0300915 struct task_smack *bsp = bprm->cred->security;
Casey Schaufler676dac42010-12-02 06:43:39 -0800916 struct inode_smack *isp;
Seth Forshee809c02e2016-04-26 14:36:22 -0500917 struct superblock_smack *sbsp;
Casey Schaufler676dac42010-12-02 06:43:39 -0800918 int rc;
919
Kees Cookddb4a142017-07-18 15:25:23 -0700920 if (bprm->called_set_creds)
Casey Schaufler676dac42010-12-02 06:43:39 -0800921 return 0;
922
Jarkko Sakkinen84088ba2011-10-07 09:27:53 +0300923 isp = inode->i_security;
924 if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task)
Casey Schaufler676dac42010-12-02 06:43:39 -0800925 return 0;
926
Seth Forshee809c02e2016-04-26 14:36:22 -0500927 sbsp = inode->i_sb->s_security;
928 if ((sbsp->smk_flags & SMK_SB_UNTRUSTED) &&
929 isp->smk_task != sbsp->smk_root)
930 return 0;
931
Eric W. Biederman9227dd22017-01-23 17:26:31 +1300932 if (bprm->unsafe & LSM_UNSAFE_PTRACE) {
Lukasz Pawelczyk56638842014-03-11 17:07:05 +0100933 struct task_struct *tracer;
934 rc = 0;
935
936 rcu_read_lock();
937 tracer = ptrace_parent(current);
938 if (likely(tracer != NULL))
939 rc = smk_ptrace_rule_check(tracer,
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +0200940 isp->smk_task,
Lukasz Pawelczyk56638842014-03-11 17:07:05 +0100941 PTRACE_MODE_ATTACH,
942 __func__);
943 rcu_read_unlock();
944
945 if (rc != 0)
946 return rc;
947 } else if (bprm->unsafe)
Jarkko Sakkinen84088ba2011-10-07 09:27:53 +0300948 return -EPERM;
Casey Schaufler676dac42010-12-02 06:43:39 -0800949
Jarkko Sakkinen84088ba2011-10-07 09:27:53 +0300950 bsp->smk_task = isp->smk_task;
951 bprm->per_clear |= PER_CLEAR_ON_SETID;
Casey Schaufler676dac42010-12-02 06:43:39 -0800952
Kees Cookccbb6e12017-07-18 15:25:26 -0700953 /* Decide if this is a secure exec. */
954 if (bsp->smk_task != bsp->smk_forked)
955 bprm->secureexec = 1;
956
Casey Schaufler676dac42010-12-02 06:43:39 -0800957 return 0;
958}
959
960/*
Casey Schauflere114e472008-02-04 22:29:50 -0800961 * Inode hooks
962 */
963
964/**
965 * smack_inode_alloc_security - allocate an inode blob
Randy Dunlap251a2a92009-02-18 11:42:33 -0800966 * @inode: the inode in need of a blob
Casey Schauflere114e472008-02-04 22:29:50 -0800967 *
968 * Returns 0 if it gets a blob, -ENOMEM otherwise
969 */
970static int smack_inode_alloc_security(struct inode *inode)
971{
Casey Schaufler2f823ff2013-05-22 18:43:03 -0700972 struct smack_known *skp = smk_of_current();
973
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +0200974 inode->i_security = new_inode_smack(skp);
Casey Schauflere114e472008-02-04 22:29:50 -0800975 if (inode->i_security == NULL)
976 return -ENOMEM;
977 return 0;
978}
979
980/**
Himanshu Shukla3d4f6732016-11-23 11:59:19 +0530981 * smack_inode_free_rcu - Free inode_smack blob from cache
982 * @head: the rcu_head for getting inode_smack pointer
983 *
984 * Call back function called from call_rcu() to free
985 * the i_security blob pointer in inode
986 */
987static void smack_inode_free_rcu(struct rcu_head *head)
988{
989 struct inode_smack *issp;
990
991 issp = container_of(head, struct inode_smack, smk_rcu);
992 kmem_cache_free(smack_inode_cache, issp);
993}
994
995/**
996 * smack_inode_free_security - free an inode blob using call_rcu()
Randy Dunlap251a2a92009-02-18 11:42:33 -0800997 * @inode: the inode with a blob
Casey Schauflere114e472008-02-04 22:29:50 -0800998 *
Himanshu Shukla3d4f6732016-11-23 11:59:19 +0530999 * Clears the blob pointer in inode using RCU
Casey Schauflere114e472008-02-04 22:29:50 -08001000 */
1001static void smack_inode_free_security(struct inode *inode)
1002{
Himanshu Shukla3d4f6732016-11-23 11:59:19 +05301003 struct inode_smack *issp = inode->i_security;
1004
1005 /*
1006 * The inode may still be referenced in a path walk and
1007 * a call to smack_inode_permission() can be made
1008 * after smack_inode_free_security() is called.
1009 * To avoid race condition free the i_security via RCU
1010 * and leave the current inode->i_security pointer intact.
1011 * The inode will be freed after the RCU grace period too.
1012 */
1013 call_rcu(&issp->smk_rcu, smack_inode_free_rcu);
Casey Schauflere114e472008-02-04 22:29:50 -08001014}
1015
1016/**
1017 * smack_inode_init_security - copy out the smack from an inode
Lukasz Pawelczyke95ef492014-08-29 17:02:53 +02001018 * @inode: the newly created inode
1019 * @dir: containing directory object
Eric Paris2a7dba32011-02-01 11:05:39 -05001020 * @qstr: unused
Casey Schauflere114e472008-02-04 22:29:50 -08001021 * @name: where to put the attribute name
1022 * @value: where to put the attribute value
1023 * @len: where to put the length of the attribute
1024 *
1025 * Returns 0 if it all works out, -ENOMEM if there's no memory
1026 */
1027static int smack_inode_init_security(struct inode *inode, struct inode *dir,
Tetsuo Handa95489062013-07-25 05:44:02 +09001028 const struct qstr *qstr, const char **name,
Eric Paris2a7dba32011-02-01 11:05:39 -05001029 void **value, size_t *len)
Casey Schauflere114e472008-02-04 22:29:50 -08001030{
Casey Schaufler2267b132012-03-13 19:14:19 -07001031 struct inode_smack *issp = inode->i_security;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001032 struct smack_known *skp = smk_of_current();
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02001033 struct smack_known *isp = smk_of_inode(inode);
1034 struct smack_known *dsp = smk_of_inode(dir);
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001035 int may;
Casey Schauflere114e472008-02-04 22:29:50 -08001036
Tetsuo Handa95489062013-07-25 05:44:02 +09001037 if (name)
1038 *name = XATTR_SMACK_SUFFIX;
Casey Schauflere114e472008-02-04 22:29:50 -08001039
Lukasz Pawelczyk68390cc2014-11-26 15:31:07 +01001040 if (value && len) {
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001041 rcu_read_lock();
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02001042 may = smk_access_entry(skp->smk_known, dsp->smk_known,
1043 &skp->smk_rules);
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001044 rcu_read_unlock();
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +02001045
1046 /*
1047 * If the access rule allows transmutation and
1048 * the directory requests transmutation then
1049 * by all means transmute.
Casey Schaufler2267b132012-03-13 19:14:19 -07001050 * Mark the inode as changed.
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +02001051 */
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001052 if (may > 0 && ((may & MAY_TRANSMUTE) != 0) &&
Casey Schaufler2267b132012-03-13 19:14:19 -07001053 smk_inode_transmutable(dir)) {
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +02001054 isp = dsp;
Casey Schaufler2267b132012-03-13 19:14:19 -07001055 issp->smk_flags |= SMK_INODE_CHANGED;
1056 }
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +02001057
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02001058 *value = kstrdup(isp->smk_known, GFP_NOFS);
Casey Schauflere114e472008-02-04 22:29:50 -08001059 if (*value == NULL)
1060 return -ENOMEM;
Casey Schauflere114e472008-02-04 22:29:50 -08001061
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02001062 *len = strlen(isp->smk_known);
Lukasz Pawelczyk68390cc2014-11-26 15:31:07 +01001063 }
Casey Schauflere114e472008-02-04 22:29:50 -08001064
1065 return 0;
1066}
1067
1068/**
1069 * smack_inode_link - Smack check on link
1070 * @old_dentry: the existing object
1071 * @dir: unused
1072 * @new_dentry: the new object
1073 *
1074 * Returns 0 if access is permitted, an error code otherwise
1075 */
1076static int smack_inode_link(struct dentry *old_dentry, struct inode *dir,
1077 struct dentry *new_dentry)
1078{
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02001079 struct smack_known *isp;
Etienne Bassetecfcc532009-04-08 20:40:06 +02001080 struct smk_audit_info ad;
1081 int rc;
1082
Eric Parisa2694342011-04-25 13:10:27 -04001083 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
Etienne Bassetecfcc532009-04-08 20:40:06 +02001084 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
Casey Schauflere114e472008-02-04 22:29:50 -08001085
David Howellsc6f493d2015-03-17 22:26:22 +00001086 isp = smk_of_inode(d_backing_inode(old_dentry));
Etienne Bassetecfcc532009-04-08 20:40:06 +02001087 rc = smk_curacc(isp, MAY_WRITE, &ad);
David Howellsc6f493d2015-03-17 22:26:22 +00001088 rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_WRITE, rc);
Casey Schauflere114e472008-02-04 22:29:50 -08001089
David Howells88025652015-01-29 12:02:32 +00001090 if (rc == 0 && d_is_positive(new_dentry)) {
David Howellsc6f493d2015-03-17 22:26:22 +00001091 isp = smk_of_inode(d_backing_inode(new_dentry));
Etienne Bassetecfcc532009-04-08 20:40:06 +02001092 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
1093 rc = smk_curacc(isp, MAY_WRITE, &ad);
David Howellsc6f493d2015-03-17 22:26:22 +00001094 rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_WRITE, rc);
Casey Schauflere114e472008-02-04 22:29:50 -08001095 }
1096
1097 return rc;
1098}
1099
1100/**
1101 * smack_inode_unlink - Smack check on inode deletion
1102 * @dir: containing directory object
1103 * @dentry: file to unlink
1104 *
1105 * Returns 0 if current can write the containing directory
1106 * and the object, error code otherwise
1107 */
1108static int smack_inode_unlink(struct inode *dir, struct dentry *dentry)
1109{
David Howellsc6f493d2015-03-17 22:26:22 +00001110 struct inode *ip = d_backing_inode(dentry);
Etienne Bassetecfcc532009-04-08 20:40:06 +02001111 struct smk_audit_info ad;
Casey Schauflere114e472008-02-04 22:29:50 -08001112 int rc;
1113
Eric Parisa2694342011-04-25 13:10:27 -04001114 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
Etienne Bassetecfcc532009-04-08 20:40:06 +02001115 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1116
Casey Schauflere114e472008-02-04 22:29:50 -08001117 /*
1118 * You need write access to the thing you're unlinking
1119 */
Etienne Bassetecfcc532009-04-08 20:40:06 +02001120 rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad);
Casey Schauflerd166c802014-08-27 14:51:27 -07001121 rc = smk_bu_inode(ip, MAY_WRITE, rc);
Etienne Bassetecfcc532009-04-08 20:40:06 +02001122 if (rc == 0) {
Casey Schauflere114e472008-02-04 22:29:50 -08001123 /*
1124 * You also need write access to the containing directory
1125 */
Igor Zhbanovcdb56b62013-03-19 13:49:47 +04001126 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
Etienne Bassetecfcc532009-04-08 20:40:06 +02001127 smk_ad_setfield_u_fs_inode(&ad, dir);
1128 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
Casey Schauflerd166c802014-08-27 14:51:27 -07001129 rc = smk_bu_inode(dir, MAY_WRITE, rc);
Etienne Bassetecfcc532009-04-08 20:40:06 +02001130 }
Casey Schauflere114e472008-02-04 22:29:50 -08001131 return rc;
1132}
1133
1134/**
1135 * smack_inode_rmdir - Smack check on directory deletion
1136 * @dir: containing directory object
1137 * @dentry: directory to unlink
1138 *
1139 * Returns 0 if current can write the containing directory
1140 * and the directory, error code otherwise
1141 */
1142static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry)
1143{
Etienne Bassetecfcc532009-04-08 20:40:06 +02001144 struct smk_audit_info ad;
Casey Schauflere114e472008-02-04 22:29:50 -08001145 int rc;
1146
Eric Parisa2694342011-04-25 13:10:27 -04001147 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
Etienne Bassetecfcc532009-04-08 20:40:06 +02001148 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1149
Casey Schauflere114e472008-02-04 22:29:50 -08001150 /*
1151 * You need write access to the thing you're removing
1152 */
David Howellsc6f493d2015-03-17 22:26:22 +00001153 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1154 rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
Etienne Bassetecfcc532009-04-08 20:40:06 +02001155 if (rc == 0) {
Casey Schauflere114e472008-02-04 22:29:50 -08001156 /*
1157 * You also need write access to the containing directory
1158 */
Igor Zhbanovcdb56b62013-03-19 13:49:47 +04001159 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
Etienne Bassetecfcc532009-04-08 20:40:06 +02001160 smk_ad_setfield_u_fs_inode(&ad, dir);
1161 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
Casey Schauflerd166c802014-08-27 14:51:27 -07001162 rc = smk_bu_inode(dir, MAY_WRITE, rc);
Etienne Bassetecfcc532009-04-08 20:40:06 +02001163 }
Casey Schauflere114e472008-02-04 22:29:50 -08001164
1165 return rc;
1166}
1167
1168/**
1169 * smack_inode_rename - Smack check on rename
Lukasz Pawelczyke95ef492014-08-29 17:02:53 +02001170 * @old_inode: unused
1171 * @old_dentry: the old object
1172 * @new_inode: unused
1173 * @new_dentry: the new object
Casey Schauflere114e472008-02-04 22:29:50 -08001174 *
1175 * Read and write access is required on both the old and
1176 * new directories.
1177 *
1178 * Returns 0 if access is permitted, an error code otherwise
1179 */
1180static int smack_inode_rename(struct inode *old_inode,
1181 struct dentry *old_dentry,
1182 struct inode *new_inode,
1183 struct dentry *new_dentry)
1184{
1185 int rc;
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02001186 struct smack_known *isp;
Etienne Bassetecfcc532009-04-08 20:40:06 +02001187 struct smk_audit_info ad;
1188
Eric Parisa2694342011-04-25 13:10:27 -04001189 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
Etienne Bassetecfcc532009-04-08 20:40:06 +02001190 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
Casey Schauflere114e472008-02-04 22:29:50 -08001191
David Howellsc6f493d2015-03-17 22:26:22 +00001192 isp = smk_of_inode(d_backing_inode(old_dentry));
Etienne Bassetecfcc532009-04-08 20:40:06 +02001193 rc = smk_curacc(isp, MAY_READWRITE, &ad);
David Howellsc6f493d2015-03-17 22:26:22 +00001194 rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_READWRITE, rc);
Casey Schauflere114e472008-02-04 22:29:50 -08001195
David Howells88025652015-01-29 12:02:32 +00001196 if (rc == 0 && d_is_positive(new_dentry)) {
David Howellsc6f493d2015-03-17 22:26:22 +00001197 isp = smk_of_inode(d_backing_inode(new_dentry));
Etienne Bassetecfcc532009-04-08 20:40:06 +02001198 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
1199 rc = smk_curacc(isp, MAY_READWRITE, &ad);
David Howellsc6f493d2015-03-17 22:26:22 +00001200 rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_READWRITE, rc);
Casey Schauflere114e472008-02-04 22:29:50 -08001201 }
Casey Schauflere114e472008-02-04 22:29:50 -08001202 return rc;
1203}
1204
1205/**
1206 * smack_inode_permission - Smack version of permission()
1207 * @inode: the inode in question
1208 * @mask: the access requested
Casey Schauflere114e472008-02-04 22:29:50 -08001209 *
1210 * This is the important Smack hook.
1211 *
1212 * Returns 0 if access is permitted, -EACCES otherwise
1213 */
Al Viroe74f71e2011-06-20 19:38:15 -04001214static int smack_inode_permission(struct inode *inode, int mask)
Casey Schauflere114e472008-02-04 22:29:50 -08001215{
Seth Forshee9f50eda2015-09-23 15:16:06 -05001216 struct superblock_smack *sbsp = inode->i_sb->s_security;
Etienne Bassetecfcc532009-04-08 20:40:06 +02001217 struct smk_audit_info ad;
Al Viroe74f71e2011-06-20 19:38:15 -04001218 int no_block = mask & MAY_NOT_BLOCK;
Casey Schauflerd166c802014-08-27 14:51:27 -07001219 int rc;
Eric Parisd09ca732010-07-23 11:43:57 -04001220
1221 mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND);
Casey Schauflere114e472008-02-04 22:29:50 -08001222 /*
1223 * No permission to check. Existence test. Yup, it's there.
1224 */
1225 if (mask == 0)
1226 return 0;
Andi Kleen8c9e80e2011-04-21 17:23:19 -07001227
Seth Forshee9f50eda2015-09-23 15:16:06 -05001228 if (sbsp->smk_flags & SMK_SB_UNTRUSTED) {
1229 if (smk_of_inode(inode) != sbsp->smk_root)
1230 return -EACCES;
1231 }
1232
Andi Kleen8c9e80e2011-04-21 17:23:19 -07001233 /* May be droppable after audit */
Al Viroe74f71e2011-06-20 19:38:15 -04001234 if (no_block)
Andi Kleen8c9e80e2011-04-21 17:23:19 -07001235 return -ECHILD;
Eric Parisf48b7392011-04-25 12:54:27 -04001236 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
Etienne Bassetecfcc532009-04-08 20:40:06 +02001237 smk_ad_setfield_u_fs_inode(&ad, inode);
Casey Schauflerd166c802014-08-27 14:51:27 -07001238 rc = smk_curacc(smk_of_inode(inode), mask, &ad);
1239 rc = smk_bu_inode(inode, mask, rc);
1240 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -08001241}
1242
1243/**
1244 * smack_inode_setattr - Smack check for setting attributes
1245 * @dentry: the object
1246 * @iattr: for the force flag
1247 *
1248 * Returns 0 if access is permitted, an error code otherwise
1249 */
1250static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr)
1251{
Etienne Bassetecfcc532009-04-08 20:40:06 +02001252 struct smk_audit_info ad;
Casey Schauflerd166c802014-08-27 14:51:27 -07001253 int rc;
1254
Casey Schauflere114e472008-02-04 22:29:50 -08001255 /*
1256 * Need to allow for clearing the setuid bit.
1257 */
1258 if (iattr->ia_valid & ATTR_FORCE)
1259 return 0;
Eric Parisa2694342011-04-25 13:10:27 -04001260 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
Etienne Bassetecfcc532009-04-08 20:40:06 +02001261 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
Casey Schauflere114e472008-02-04 22:29:50 -08001262
David Howellsc6f493d2015-03-17 22:26:22 +00001263 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1264 rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
Casey Schauflerd166c802014-08-27 14:51:27 -07001265 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -08001266}
1267
1268/**
1269 * smack_inode_getattr - Smack check for getting attributes
Lukasz Pawelczyke95ef492014-08-29 17:02:53 +02001270 * @mnt: vfsmount of the object
Casey Schauflere114e472008-02-04 22:29:50 -08001271 * @dentry: the object
1272 *
1273 * Returns 0 if access is permitted, an error code otherwise
1274 */
Al Viro3f7036a2015-03-08 19:28:30 -04001275static int smack_inode_getattr(const struct path *path)
Casey Schauflere114e472008-02-04 22:29:50 -08001276{
Etienne Bassetecfcc532009-04-08 20:40:06 +02001277 struct smk_audit_info ad;
David Howellsc6f493d2015-03-17 22:26:22 +00001278 struct inode *inode = d_backing_inode(path->dentry);
Casey Schauflerd166c802014-08-27 14:51:27 -07001279 int rc;
Etienne Bassetecfcc532009-04-08 20:40:06 +02001280
Eric Parisf48b7392011-04-25 12:54:27 -04001281 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
Al Viro3f7036a2015-03-08 19:28:30 -04001282 smk_ad_setfield_u_fs_path(&ad, *path);
1283 rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad);
1284 rc = smk_bu_inode(inode, MAY_READ, rc);
Casey Schauflerd166c802014-08-27 14:51:27 -07001285 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -08001286}
1287
1288/**
1289 * smack_inode_setxattr - Smack check for setting xattrs
1290 * @dentry: the object
1291 * @name: name of the attribute
Lukasz Pawelczyke95ef492014-08-29 17:02:53 +02001292 * @value: value of the attribute
1293 * @size: size of the value
Casey Schauflere114e472008-02-04 22:29:50 -08001294 * @flags: unused
1295 *
1296 * This protects the Smack attribute explicitly.
1297 *
1298 * Returns 0 if access is permitted, an error code otherwise
1299 */
David Howells8f0cfa52008-04-29 00:59:41 -07001300static int smack_inode_setxattr(struct dentry *dentry, const char *name,
1301 const void *value, size_t size, int flags)
Casey Schauflere114e472008-02-04 22:29:50 -08001302{
Etienne Bassetecfcc532009-04-08 20:40:06 +02001303 struct smk_audit_info ad;
Casey Schaufler19760ad2013-12-16 16:27:26 -08001304 struct smack_known *skp;
1305 int check_priv = 0;
1306 int check_import = 0;
1307 int check_star = 0;
Casey Schauflerbcdca222008-02-23 15:24:04 -08001308 int rc = 0;
Casey Schauflere114e472008-02-04 22:29:50 -08001309
Casey Schaufler19760ad2013-12-16 16:27:26 -08001310 /*
1311 * Check label validity here so import won't fail in post_setxattr
1312 */
Casey Schauflerbcdca222008-02-23 15:24:04 -08001313 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
1314 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
Casey Schaufler19760ad2013-12-16 16:27:26 -08001315 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) {
1316 check_priv = 1;
1317 check_import = 1;
1318 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
1319 strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
1320 check_priv = 1;
1321 check_import = 1;
1322 check_star = 1;
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +02001323 } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
Casey Schaufler19760ad2013-12-16 16:27:26 -08001324 check_priv = 1;
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +02001325 if (size != TRANS_TRUE_SIZE ||
1326 strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0)
1327 rc = -EINVAL;
Casey Schauflerbcdca222008-02-23 15:24:04 -08001328 } else
1329 rc = cap_inode_setxattr(dentry, name, value, size, flags);
1330
Casey Schaufler19760ad2013-12-16 16:27:26 -08001331 if (check_priv && !smack_privileged(CAP_MAC_ADMIN))
1332 rc = -EPERM;
1333
1334 if (rc == 0 && check_import) {
Konstantin Khlebnikovb862e562014-08-07 20:52:43 +04001335 skp = size ? smk_import_entry(value, size) : NULL;
Lukasz Pawelczyke774ad62015-04-20 17:12:54 +02001336 if (IS_ERR(skp))
1337 rc = PTR_ERR(skp);
1338 else if (skp == NULL || (check_star &&
Casey Schaufler19760ad2013-12-16 16:27:26 -08001339 (skp == &smack_known_star || skp == &smack_known_web)))
1340 rc = -EINVAL;
1341 }
1342
Eric Parisa2694342011-04-25 13:10:27 -04001343 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
Etienne Bassetecfcc532009-04-08 20:40:06 +02001344 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1345
Casey Schauflerd166c802014-08-27 14:51:27 -07001346 if (rc == 0) {
David Howellsc6f493d2015-03-17 22:26:22 +00001347 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1348 rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
Casey Schauflerd166c802014-08-27 14:51:27 -07001349 }
Casey Schauflerbcdca222008-02-23 15:24:04 -08001350
1351 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -08001352}
1353
1354/**
1355 * smack_inode_post_setxattr - Apply the Smack update approved above
1356 * @dentry: object
1357 * @name: attribute name
1358 * @value: attribute value
1359 * @size: attribute size
1360 * @flags: unused
1361 *
1362 * Set the pointer in the inode blob to the entry found
1363 * in the master label list.
1364 */
David Howells8f0cfa52008-04-29 00:59:41 -07001365static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
1366 const void *value, size_t size, int flags)
Casey Schauflere114e472008-02-04 22:29:50 -08001367{
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001368 struct smack_known *skp;
David Howellsc6f493d2015-03-17 22:26:22 +00001369 struct inode_smack *isp = d_backing_inode(dentry)->i_security;
Casey Schaufler676dac42010-12-02 06:43:39 -08001370
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001371 if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
1372 isp->smk_flags |= SMK_INODE_TRANSMUTE;
1373 return;
1374 }
1375
Casey Schaufler676dac42010-12-02 06:43:39 -08001376 if (strcmp(name, XATTR_NAME_SMACK) == 0) {
José Bollo9598f4c2014-04-03 13:48:41 +02001377 skp = smk_import_entry(value, size);
Lukasz Pawelczyke774ad62015-04-20 17:12:54 +02001378 if (!IS_ERR(skp))
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02001379 isp->smk_inode = skp;
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +02001380 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) {
José Bollo9598f4c2014-04-03 13:48:41 +02001381 skp = smk_import_entry(value, size);
Lukasz Pawelczyke774ad62015-04-20 17:12:54 +02001382 if (!IS_ERR(skp))
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001383 isp->smk_task = skp;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001384 } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
José Bollo9598f4c2014-04-03 13:48:41 +02001385 skp = smk_import_entry(value, size);
Lukasz Pawelczyke774ad62015-04-20 17:12:54 +02001386 if (!IS_ERR(skp))
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001387 isp->smk_mmap = skp;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001388 }
Casey Schauflere114e472008-02-04 22:29:50 -08001389
1390 return;
1391}
1392
Casey Schauflerce8a4322011-09-29 18:21:01 -07001393/**
Casey Schauflere114e472008-02-04 22:29:50 -08001394 * smack_inode_getxattr - Smack check on getxattr
1395 * @dentry: the object
1396 * @name: unused
1397 *
1398 * Returns 0 if access is permitted, an error code otherwise
1399 */
David Howells8f0cfa52008-04-29 00:59:41 -07001400static int smack_inode_getxattr(struct dentry *dentry, const char *name)
Casey Schauflere114e472008-02-04 22:29:50 -08001401{
Etienne Bassetecfcc532009-04-08 20:40:06 +02001402 struct smk_audit_info ad;
Casey Schauflerd166c802014-08-27 14:51:27 -07001403 int rc;
Etienne Bassetecfcc532009-04-08 20:40:06 +02001404
Eric Parisa2694342011-04-25 13:10:27 -04001405 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
Etienne Bassetecfcc532009-04-08 20:40:06 +02001406 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1407
David Howellsc6f493d2015-03-17 22:26:22 +00001408 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_READ, &ad);
1409 rc = smk_bu_inode(d_backing_inode(dentry), MAY_READ, rc);
Casey Schauflerd166c802014-08-27 14:51:27 -07001410 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -08001411}
1412
Casey Schauflerce8a4322011-09-29 18:21:01 -07001413/**
Casey Schauflere114e472008-02-04 22:29:50 -08001414 * smack_inode_removexattr - Smack check on removexattr
1415 * @dentry: the object
1416 * @name: name of the attribute
1417 *
1418 * Removing the Smack attribute requires CAP_MAC_ADMIN
1419 *
1420 * Returns 0 if access is permitted, an error code otherwise
1421 */
David Howells8f0cfa52008-04-29 00:59:41 -07001422static int smack_inode_removexattr(struct dentry *dentry, const char *name)
Casey Schauflere114e472008-02-04 22:29:50 -08001423{
Casey Schaufler676dac42010-12-02 06:43:39 -08001424 struct inode_smack *isp;
Etienne Bassetecfcc532009-04-08 20:40:06 +02001425 struct smk_audit_info ad;
Casey Schauflerbcdca222008-02-23 15:24:04 -08001426 int rc = 0;
Casey Schauflere114e472008-02-04 22:29:50 -08001427
Casey Schauflerbcdca222008-02-23 15:24:04 -08001428 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
1429 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
Casey Schaufler676dac42010-12-02 06:43:39 -08001430 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +02001431 strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001432 strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 ||
Pankaj Kumar5e9ab592013-12-13 15:12:22 +05301433 strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
Casey Schaufler1880eff2012-06-05 15:28:30 -07001434 if (!smack_privileged(CAP_MAC_ADMIN))
Casey Schauflerbcdca222008-02-23 15:24:04 -08001435 rc = -EPERM;
1436 } else
1437 rc = cap_inode_removexattr(dentry, name);
1438
Casey Schauflerf59bdfb2014-04-10 16:35:36 -07001439 if (rc != 0)
1440 return rc;
1441
Eric Parisa2694342011-04-25 13:10:27 -04001442 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
Etienne Bassetecfcc532009-04-08 20:40:06 +02001443 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
Casey Schauflerbcdca222008-02-23 15:24:04 -08001444
David Howellsc6f493d2015-03-17 22:26:22 +00001445 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1446 rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
Casey Schauflerf59bdfb2014-04-10 16:35:36 -07001447 if (rc != 0)
1448 return rc;
1449
David Howellsc6f493d2015-03-17 22:26:22 +00001450 isp = d_backing_inode(dentry)->i_security;
Casey Schauflerf59bdfb2014-04-10 16:35:36 -07001451 /*
1452 * Don't do anything special for these.
1453 * XATTR_NAME_SMACKIPIN
1454 * XATTR_NAME_SMACKIPOUT
Casey Schauflerf59bdfb2014-04-10 16:35:36 -07001455 */
José Bollo80124952016-01-12 21:23:40 +01001456 if (strcmp(name, XATTR_NAME_SMACK) == 0) {
Al Virofc640052016-04-10 01:33:30 -04001457 struct super_block *sbp = dentry->d_sb;
José Bollo80124952016-01-12 21:23:40 +01001458 struct superblock_smack *sbsp = sbp->s_security;
1459
1460 isp->smk_inode = sbsp->smk_default;
1461 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0)
Casey Schaufler676dac42010-12-02 06:43:39 -08001462 isp->smk_task = NULL;
Casey Schauflerf59bdfb2014-04-10 16:35:36 -07001463 else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0)
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001464 isp->smk_mmap = NULL;
Casey Schauflerf59bdfb2014-04-10 16:35:36 -07001465 else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0)
1466 isp->smk_flags &= ~SMK_INODE_TRANSMUTE;
Casey Schaufler676dac42010-12-02 06:43:39 -08001467
Casey Schauflerf59bdfb2014-04-10 16:35:36 -07001468 return 0;
Casey Schauflere114e472008-02-04 22:29:50 -08001469}
1470
1471/**
1472 * smack_inode_getsecurity - get smack xattrs
1473 * @inode: the object
1474 * @name: attribute name
1475 * @buffer: where to put the result
Casey Schaufler57e7ba02017-09-19 09:39:08 -07001476 * @alloc: duplicate memory
Casey Schauflere114e472008-02-04 22:29:50 -08001477 *
1478 * Returns the size of the attribute or an error code
1479 */
Andreas Gruenbacherea861df2015-12-24 11:09:39 -05001480static int smack_inode_getsecurity(struct inode *inode,
Casey Schauflere114e472008-02-04 22:29:50 -08001481 const char *name, void **buffer,
1482 bool alloc)
1483{
1484 struct socket_smack *ssp;
1485 struct socket *sock;
1486 struct super_block *sbp;
1487 struct inode *ip = (struct inode *)inode;
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02001488 struct smack_known *isp;
Casey Schauflere114e472008-02-04 22:29:50 -08001489
Casey Schaufler57e7ba02017-09-19 09:39:08 -07001490 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0)
Casey Schauflere114e472008-02-04 22:29:50 -08001491 isp = smk_of_inode(inode);
Casey Schaufler57e7ba02017-09-19 09:39:08 -07001492 else {
1493 /*
1494 * The rest of the Smack xattrs are only on sockets.
1495 */
1496 sbp = ip->i_sb;
1497 if (sbp->s_magic != SOCKFS_MAGIC)
1498 return -EOPNOTSUPP;
1499
1500 sock = SOCKET_I(ip);
1501 if (sock == NULL || sock->sk == NULL)
1502 return -EOPNOTSUPP;
1503
1504 ssp = sock->sk->sk_security;
1505
1506 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
1507 isp = ssp->smk_in;
1508 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0)
1509 isp = ssp->smk_out;
1510 else
1511 return -EOPNOTSUPP;
Casey Schauflere114e472008-02-04 22:29:50 -08001512 }
1513
Casey Schaufler57e7ba02017-09-19 09:39:08 -07001514 if (alloc) {
1515 *buffer = kstrdup(isp->smk_known, GFP_KERNEL);
1516 if (*buffer == NULL)
1517 return -ENOMEM;
Casey Schauflere114e472008-02-04 22:29:50 -08001518 }
1519
Casey Schaufler57e7ba02017-09-19 09:39:08 -07001520 return strlen(isp->smk_known);
Casey Schauflere114e472008-02-04 22:29:50 -08001521}
1522
1523
1524/**
1525 * smack_inode_listsecurity - list the Smack attributes
1526 * @inode: the object
1527 * @buffer: where they go
1528 * @buffer_size: size of buffer
Casey Schauflere114e472008-02-04 22:29:50 -08001529 */
1530static int smack_inode_listsecurity(struct inode *inode, char *buffer,
1531 size_t buffer_size)
1532{
Konstantin Khlebnikovfd5c9d22014-08-07 20:52:33 +04001533 int len = sizeof(XATTR_NAME_SMACK);
Casey Schauflere114e472008-02-04 22:29:50 -08001534
Konstantin Khlebnikovfd5c9d22014-08-07 20:52:33 +04001535 if (buffer != NULL && len <= buffer_size)
Casey Schauflere114e472008-02-04 22:29:50 -08001536 memcpy(buffer, XATTR_NAME_SMACK, len);
Konstantin Khlebnikovfd5c9d22014-08-07 20:52:33 +04001537
1538 return len;
Casey Schauflere114e472008-02-04 22:29:50 -08001539}
1540
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10001541/**
1542 * smack_inode_getsecid - Extract inode's security id
1543 * @inode: inode to extract the info from
1544 * @secid: where result will be saved
1545 */
Andreas Gruenbacherd6335d72015-12-24 11:09:39 -05001546static void smack_inode_getsecid(struct inode *inode, u32 *secid)
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10001547{
1548 struct inode_smack *isp = inode->i_security;
1549
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02001550 *secid = isp->smk_inode->smk_secid;
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10001551}
1552
Casey Schauflere114e472008-02-04 22:29:50 -08001553/*
1554 * File Hooks
1555 */
1556
Casey Schaufler491a0b02016-01-26 15:08:35 -08001557/*
1558 * There is no smack_file_permission hook
Casey Schauflere114e472008-02-04 22:29:50 -08001559 *
1560 * Should access checks be done on each read or write?
1561 * UNICOS and SELinux say yes.
1562 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
1563 *
1564 * I'll say no for now. Smack does not do the frequent
1565 * label changing that SELinux does.
1566 */
Casey Schauflere114e472008-02-04 22:29:50 -08001567
1568/**
1569 * smack_file_alloc_security - assign a file security blob
1570 * @file: the object
1571 *
1572 * The security blob for a file is a pointer to the master
1573 * label list, so no allocation is done.
1574 *
Casey Schaufler5e7270a2014-12-12 17:19:19 -08001575 * f_security is the owner security information. It
1576 * isn't used on file access checks, it's for send_sigio.
1577 *
Casey Schauflere114e472008-02-04 22:29:50 -08001578 * Returns 0
1579 */
1580static int smack_file_alloc_security(struct file *file)
1581{
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001582 struct smack_known *skp = smk_of_current();
1583
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02001584 file->f_security = skp;
Casey Schauflere114e472008-02-04 22:29:50 -08001585 return 0;
1586}
1587
1588/**
1589 * smack_file_free_security - clear a file security blob
1590 * @file: the object
1591 *
1592 * The security blob for a file is a pointer to the master
1593 * label list, so no memory is freed.
1594 */
1595static void smack_file_free_security(struct file *file)
1596{
1597 file->f_security = NULL;
1598}
1599
1600/**
1601 * smack_file_ioctl - Smack check on ioctls
1602 * @file: the object
1603 * @cmd: what to do
1604 * @arg: unused
1605 *
1606 * Relies heavily on the correct use of the ioctl command conventions.
1607 *
1608 * Returns 0 if allowed, error code otherwise
1609 */
1610static int smack_file_ioctl(struct file *file, unsigned int cmd,
1611 unsigned long arg)
1612{
1613 int rc = 0;
Etienne Bassetecfcc532009-04-08 20:40:06 +02001614 struct smk_audit_info ad;
Casey Schaufler5e7270a2014-12-12 17:19:19 -08001615 struct inode *inode = file_inode(file);
Etienne Bassetecfcc532009-04-08 20:40:06 +02001616
Seung-Woo Kim83a1e532016-12-12 17:35:26 +09001617 if (unlikely(IS_PRIVATE(inode)))
1618 return 0;
1619
Eric Parisf48b7392011-04-25 12:54:27 -04001620 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
Etienne Bassetecfcc532009-04-08 20:40:06 +02001621 smk_ad_setfield_u_fs_path(&ad, file->f_path);
Casey Schauflere114e472008-02-04 22:29:50 -08001622
Casey Schauflerd166c802014-08-27 14:51:27 -07001623 if (_IOC_DIR(cmd) & _IOC_WRITE) {
Casey Schaufler5e7270a2014-12-12 17:19:19 -08001624 rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad);
Casey Schauflerd166c802014-08-27 14:51:27 -07001625 rc = smk_bu_file(file, MAY_WRITE, rc);
1626 }
Casey Schauflere114e472008-02-04 22:29:50 -08001627
Casey Schauflerd166c802014-08-27 14:51:27 -07001628 if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) {
Casey Schaufler5e7270a2014-12-12 17:19:19 -08001629 rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad);
Casey Schauflerd166c802014-08-27 14:51:27 -07001630 rc = smk_bu_file(file, MAY_READ, rc);
1631 }
Casey Schauflere114e472008-02-04 22:29:50 -08001632
1633 return rc;
1634}
1635
1636/**
1637 * smack_file_lock - Smack check on file locking
1638 * @file: the object
Randy Dunlap251a2a92009-02-18 11:42:33 -08001639 * @cmd: unused
Casey Schauflere114e472008-02-04 22:29:50 -08001640 *
Casey Schauflerc0ab6e52013-10-11 18:06:39 -07001641 * Returns 0 if current has lock access, error code otherwise
Casey Schauflere114e472008-02-04 22:29:50 -08001642 */
1643static int smack_file_lock(struct file *file, unsigned int cmd)
1644{
Etienne Bassetecfcc532009-04-08 20:40:06 +02001645 struct smk_audit_info ad;
Casey Schauflerd166c802014-08-27 14:51:27 -07001646 int rc;
Casey Schaufler5e7270a2014-12-12 17:19:19 -08001647 struct inode *inode = file_inode(file);
Etienne Bassetecfcc532009-04-08 20:40:06 +02001648
Seung-Woo Kim83a1e532016-12-12 17:35:26 +09001649 if (unlikely(IS_PRIVATE(inode)))
1650 return 0;
1651
Eric Paris92f42502011-04-25 13:15:55 -04001652 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1653 smk_ad_setfield_u_fs_path(&ad, file->f_path);
Casey Schaufler5e7270a2014-12-12 17:19:19 -08001654 rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad);
Casey Schauflerd166c802014-08-27 14:51:27 -07001655 rc = smk_bu_file(file, MAY_LOCK, rc);
1656 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -08001657}
1658
1659/**
1660 * smack_file_fcntl - Smack check on fcntl
1661 * @file: the object
1662 * @cmd: what action to check
1663 * @arg: unused
1664 *
Casey Schaufler531f1d42011-09-19 12:41:42 -07001665 * Generally these operations are harmless.
1666 * File locking operations present an obvious mechanism
1667 * for passing information, so they require write access.
1668 *
Casey Schauflere114e472008-02-04 22:29:50 -08001669 * Returns 0 if current has access, error code otherwise
1670 */
1671static int smack_file_fcntl(struct file *file, unsigned int cmd,
1672 unsigned long arg)
1673{
Etienne Bassetecfcc532009-04-08 20:40:06 +02001674 struct smk_audit_info ad;
Casey Schaufler531f1d42011-09-19 12:41:42 -07001675 int rc = 0;
Casey Schaufler5e7270a2014-12-12 17:19:19 -08001676 struct inode *inode = file_inode(file);
Etienne Bassetecfcc532009-04-08 20:40:06 +02001677
Seung-Woo Kim83a1e532016-12-12 17:35:26 +09001678 if (unlikely(IS_PRIVATE(inode)))
1679 return 0;
1680
Casey Schauflere114e472008-02-04 22:29:50 -08001681 switch (cmd) {
Casey Schauflere114e472008-02-04 22:29:50 -08001682 case F_GETLK:
Casey Schauflerc0ab6e52013-10-11 18:06:39 -07001683 break;
Casey Schauflere114e472008-02-04 22:29:50 -08001684 case F_SETLK:
1685 case F_SETLKW:
Casey Schauflerc0ab6e52013-10-11 18:06:39 -07001686 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1687 smk_ad_setfield_u_fs_path(&ad, file->f_path);
Casey Schaufler5e7270a2014-12-12 17:19:19 -08001688 rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad);
Casey Schauflerd166c802014-08-27 14:51:27 -07001689 rc = smk_bu_file(file, MAY_LOCK, rc);
Casey Schauflerc0ab6e52013-10-11 18:06:39 -07001690 break;
Casey Schauflere114e472008-02-04 22:29:50 -08001691 case F_SETOWN:
1692 case F_SETSIG:
Casey Schaufler531f1d42011-09-19 12:41:42 -07001693 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1694 smk_ad_setfield_u_fs_path(&ad, file->f_path);
Casey Schaufler5e7270a2014-12-12 17:19:19 -08001695 rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad);
Casey Schauflerd166c802014-08-27 14:51:27 -07001696 rc = smk_bu_file(file, MAY_WRITE, rc);
Casey Schauflere114e472008-02-04 22:29:50 -08001697 break;
1698 default:
Casey Schaufler531f1d42011-09-19 12:41:42 -07001699 break;
Casey Schauflere114e472008-02-04 22:29:50 -08001700 }
1701
1702 return rc;
1703}
1704
1705/**
Al Viroe5467852012-05-30 13:30:51 -04001706 * smack_mmap_file :
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001707 * Check permissions for a mmap operation. The @file may be NULL, e.g.
1708 * if mapping anonymous memory.
1709 * @file contains the file structure for file to map (may be NULL).
1710 * @reqprot contains the protection requested by the application.
1711 * @prot contains the protection that will be applied by the kernel.
1712 * @flags contains the operational flags.
1713 * Return 0 if permission is granted.
1714 */
Al Viroe5467852012-05-30 13:30:51 -04001715static int smack_mmap_file(struct file *file,
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001716 unsigned long reqprot, unsigned long prot,
Al Viroe5467852012-05-30 13:30:51 -04001717 unsigned long flags)
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001718{
Casey Schaufler272cd7a2011-09-20 12:24:36 -07001719 struct smack_known *skp;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001720 struct smack_known *mkp;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001721 struct smack_rule *srp;
1722 struct task_smack *tsp;
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02001723 struct smack_known *okp;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001724 struct inode_smack *isp;
Seth Forshee809c02e2016-04-26 14:36:22 -05001725 struct superblock_smack *sbsp;
Casey Schaufler0e0a0702011-02-08 16:36:24 -08001726 int may;
1727 int mmay;
1728 int tmay;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001729 int rc;
1730
Al Viro496ad9a2013-01-23 17:07:38 -05001731 if (file == NULL)
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001732 return 0;
1733
Seung-Woo Kim83a1e532016-12-12 17:35:26 +09001734 if (unlikely(IS_PRIVATE(file_inode(file))))
1735 return 0;
1736
Al Viro496ad9a2013-01-23 17:07:38 -05001737 isp = file_inode(file)->i_security;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001738 if (isp->smk_mmap == NULL)
1739 return 0;
Seth Forshee809c02e2016-04-26 14:36:22 -05001740 sbsp = file_inode(file)->i_sb->s_security;
1741 if (sbsp->smk_flags & SMK_SB_UNTRUSTED &&
1742 isp->smk_mmap != sbsp->smk_root)
1743 return -EACCES;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001744 mkp = isp->smk_mmap;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001745
1746 tsp = current_security();
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001747 skp = smk_of_current();
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001748 rc = 0;
1749
1750 rcu_read_lock();
1751 /*
1752 * For each Smack rule associated with the subject
1753 * label verify that the SMACK64MMAP also has access
1754 * to that rule's object label.
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001755 */
Casey Schaufler272cd7a2011-09-20 12:24:36 -07001756 list_for_each_entry_rcu(srp, &skp->smk_rules, list) {
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02001757 okp = srp->smk_object;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001758 /*
1759 * Matching labels always allows access.
1760 */
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02001761 if (mkp->smk_known == okp->smk_known)
Casey Schaufler0e0a0702011-02-08 16:36:24 -08001762 continue;
1763 /*
1764 * If there is a matching local rule take
1765 * that into account as well.
1766 */
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02001767 may = smk_access_entry(srp->smk_subject->smk_known,
1768 okp->smk_known,
1769 &tsp->smk_rules);
Casey Schaufler0e0a0702011-02-08 16:36:24 -08001770 if (may == -ENOENT)
1771 may = srp->smk_access;
1772 else
1773 may &= srp->smk_access;
1774 /*
1775 * If may is zero the SMACK64MMAP subject can't
1776 * possibly have less access.
1777 */
1778 if (may == 0)
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001779 continue;
1780
Casey Schaufler0e0a0702011-02-08 16:36:24 -08001781 /*
1782 * Fetch the global list entry.
1783 * If there isn't one a SMACK64MMAP subject
1784 * can't have as much access as current.
1785 */
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02001786 mmay = smk_access_entry(mkp->smk_known, okp->smk_known,
1787 &mkp->smk_rules);
Casey Schaufler0e0a0702011-02-08 16:36:24 -08001788 if (mmay == -ENOENT) {
1789 rc = -EACCES;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001790 break;
Casey Schaufler0e0a0702011-02-08 16:36:24 -08001791 }
1792 /*
1793 * If there is a local entry it modifies the
1794 * potential access, too.
1795 */
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02001796 tmay = smk_access_entry(mkp->smk_known, okp->smk_known,
1797 &tsp->smk_rules);
Casey Schaufler0e0a0702011-02-08 16:36:24 -08001798 if (tmay != -ENOENT)
1799 mmay &= tmay;
1800
1801 /*
1802 * If there is any access available to current that is
1803 * not available to a SMACK64MMAP subject
1804 * deny access.
1805 */
Casey Schaufler75a25632011-02-09 19:58:42 -08001806 if ((may | mmay) != mmay) {
Casey Schaufler0e0a0702011-02-08 16:36:24 -08001807 rc = -EACCES;
1808 break;
1809 }
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001810 }
1811
1812 rcu_read_unlock();
1813
1814 return rc;
1815}
1816
1817/**
Casey Schauflere114e472008-02-04 22:29:50 -08001818 * smack_file_set_fowner - set the file security blob value
1819 * @file: object in question
1820 *
Casey Schauflere114e472008-02-04 22:29:50 -08001821 */
Jeff Laytone0b93ed2014-08-22 11:27:32 -04001822static void smack_file_set_fowner(struct file *file)
Casey Schauflere114e472008-02-04 22:29:50 -08001823{
Casey Schaufler5e7270a2014-12-12 17:19:19 -08001824 file->f_security = smk_of_current();
Casey Schauflere114e472008-02-04 22:29:50 -08001825}
1826
1827/**
1828 * smack_file_send_sigiotask - Smack on sigio
1829 * @tsk: The target task
1830 * @fown: the object the signal come from
1831 * @signum: unused
1832 *
1833 * Allow a privileged task to get signals even if it shouldn't
1834 *
1835 * Returns 0 if a subject with the object's smack could
1836 * write to the task, an error code otherwise.
1837 */
1838static int smack_file_send_sigiotask(struct task_struct *tsk,
1839 struct fown_struct *fown, int signum)
1840{
Casey Schaufler2f823ff2013-05-22 18:43:03 -07001841 struct smack_known *skp;
1842 struct smack_known *tkp = smk_of_task(tsk->cred->security);
Casey Schauflere114e472008-02-04 22:29:50 -08001843 struct file *file;
1844 int rc;
Etienne Bassetecfcc532009-04-08 20:40:06 +02001845 struct smk_audit_info ad;
Casey Schauflere114e472008-02-04 22:29:50 -08001846
1847 /*
1848 * struct fown_struct is never outside the context of a struct file
1849 */
1850 file = container_of(fown, struct file, f_owner);
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001851
Etienne Bassetecfcc532009-04-08 20:40:06 +02001852 /* we don't log here as rc can be overriden */
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02001853 skp = file->f_security;
Casey Schauflerc60b9062016-08-30 10:31:39 -07001854 rc = smk_access(skp, tkp, MAY_DELIVER, NULL);
1855 rc = smk_bu_note("sigiotask", skp, tkp, MAY_DELIVER, rc);
David Howells5cd9c582008-08-14 11:37:28 +01001856 if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE))
Etienne Bassetecfcc532009-04-08 20:40:06 +02001857 rc = 0;
1858
1859 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1860 smk_ad_setfield_u_tsk(&ad, tsk);
Casey Schauflerc60b9062016-08-30 10:31:39 -07001861 smack_log(skp->smk_known, tkp->smk_known, MAY_DELIVER, rc, &ad);
Casey Schauflere114e472008-02-04 22:29:50 -08001862 return rc;
1863}
1864
1865/**
1866 * smack_file_receive - Smack file receive check
1867 * @file: the object
1868 *
1869 * Returns 0 if current has access, error code otherwise
1870 */
1871static int smack_file_receive(struct file *file)
1872{
Casey Schauflerd166c802014-08-27 14:51:27 -07001873 int rc;
Casey Schauflere114e472008-02-04 22:29:50 -08001874 int may = 0;
Etienne Bassetecfcc532009-04-08 20:40:06 +02001875 struct smk_audit_info ad;
Casey Schaufler5e7270a2014-12-12 17:19:19 -08001876 struct inode *inode = file_inode(file);
Casey Schaufler79be0932015-12-07 14:34:32 -08001877 struct socket *sock;
1878 struct task_smack *tsp;
1879 struct socket_smack *ssp;
Casey Schauflere114e472008-02-04 22:29:50 -08001880
Seung-Woo Kim97775822015-04-17 15:25:04 +09001881 if (unlikely(IS_PRIVATE(inode)))
1882 return 0;
1883
Casey Schaufler4482a442013-12-30 17:37:45 -08001884 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
Etienne Bassetecfcc532009-04-08 20:40:06 +02001885 smk_ad_setfield_u_fs_path(&ad, file->f_path);
Casey Schaufler79be0932015-12-07 14:34:32 -08001886
Casey Schaufler51d59af2017-05-31 08:53:42 -07001887 if (inode->i_sb->s_magic == SOCKFS_MAGIC) {
Casey Schaufler79be0932015-12-07 14:34:32 -08001888 sock = SOCKET_I(inode);
1889 ssp = sock->sk->sk_security;
1890 tsp = current_security();
1891 /*
1892 * If the receiving process can't write to the
1893 * passed socket or if the passed socket can't
1894 * write to the receiving process don't accept
1895 * the passed socket.
1896 */
1897 rc = smk_access(tsp->smk_task, ssp->smk_out, MAY_WRITE, &ad);
1898 rc = smk_bu_file(file, may, rc);
1899 if (rc < 0)
1900 return rc;
1901 rc = smk_access(ssp->smk_in, tsp->smk_task, MAY_WRITE, &ad);
1902 rc = smk_bu_file(file, may, rc);
1903 return rc;
1904 }
Casey Schauflere114e472008-02-04 22:29:50 -08001905 /*
1906 * This code relies on bitmasks.
1907 */
1908 if (file->f_mode & FMODE_READ)
1909 may = MAY_READ;
1910 if (file->f_mode & FMODE_WRITE)
1911 may |= MAY_WRITE;
1912
Casey Schaufler5e7270a2014-12-12 17:19:19 -08001913 rc = smk_curacc(smk_of_inode(inode), may, &ad);
Casey Schauflerd166c802014-08-27 14:51:27 -07001914 rc = smk_bu_file(file, may, rc);
1915 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -08001916}
1917
Casey Schaufler531f1d42011-09-19 12:41:42 -07001918/**
Eric Paris83d49852012-04-04 13:45:40 -04001919 * smack_file_open - Smack dentry open processing
Casey Schaufler531f1d42011-09-19 12:41:42 -07001920 * @file: the object
Casey Schauflera6834c02014-04-21 11:10:26 -07001921 * @cred: task credential
Casey Schaufler531f1d42011-09-19 12:41:42 -07001922 *
1923 * Set the security blob in the file structure.
Casey Schauflera6834c02014-04-21 11:10:26 -07001924 * Allow the open only if the task has read access. There are
1925 * many read operations (e.g. fstat) that you can do with an
1926 * fd even if you have the file open write-only.
Casey Schaufler531f1d42011-09-19 12:41:42 -07001927 *
1928 * Returns 0
1929 */
Eric Paris83d49852012-04-04 13:45:40 -04001930static int smack_file_open(struct file *file, const struct cred *cred)
Casey Schaufler531f1d42011-09-19 12:41:42 -07001931{
Casey Schauflera6834c02014-04-21 11:10:26 -07001932 struct task_smack *tsp = cred->security;
Casey Schaufler5e7270a2014-12-12 17:19:19 -08001933 struct inode *inode = file_inode(file);
Casey Schauflera6834c02014-04-21 11:10:26 -07001934 struct smk_audit_info ad;
1935 int rc;
Casey Schaufler531f1d42011-09-19 12:41:42 -07001936
Casey Schauflera6834c02014-04-21 11:10:26 -07001937 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1938 smk_ad_setfield_u_fs_path(&ad, file->f_path);
Himanshu Shuklac9d238a2016-11-23 11:59:45 +05301939 rc = smk_tskacc(tsp, smk_of_inode(inode), MAY_READ, &ad);
Casey Schauflerd166c802014-08-27 14:51:27 -07001940 rc = smk_bu_credfile(cred, file, MAY_READ, rc);
Casey Schauflera6834c02014-04-21 11:10:26 -07001941
1942 return rc;
Casey Schaufler531f1d42011-09-19 12:41:42 -07001943}
1944
Casey Schauflere114e472008-02-04 22:29:50 -08001945/*
1946 * Task hooks
1947 */
1948
1949/**
David Howellsee18d642009-09-02 09:14:21 +01001950 * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1951 * @new: the new credentials
1952 * @gfp: the atomicity of any memory allocations
1953 *
1954 * Prepare a blank set of credentials for modification. This must allocate all
1955 * the memory the LSM module might require such that cred_transfer() can
1956 * complete without error.
1957 */
1958static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp)
1959{
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001960 struct task_smack *tsp;
1961
1962 tsp = new_task_smack(NULL, NULL, gfp);
1963 if (tsp == NULL)
Casey Schaufler676dac42010-12-02 06:43:39 -08001964 return -ENOMEM;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001965
1966 cred->security = tsp;
1967
David Howellsee18d642009-09-02 09:14:21 +01001968 return 0;
1969}
1970
1971
1972/**
David Howellsf1752ee2008-11-14 10:39:17 +11001973 * smack_cred_free - "free" task-level security credentials
1974 * @cred: the credentials in question
Casey Schauflere114e472008-02-04 22:29:50 -08001975 *
Casey Schauflere114e472008-02-04 22:29:50 -08001976 */
David Howellsf1752ee2008-11-14 10:39:17 +11001977static void smack_cred_free(struct cred *cred)
Casey Schauflere114e472008-02-04 22:29:50 -08001978{
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001979 struct task_smack *tsp = cred->security;
1980 struct smack_rule *rp;
1981 struct list_head *l;
1982 struct list_head *n;
1983
1984 if (tsp == NULL)
1985 return;
1986 cred->security = NULL;
1987
Zbigniew Jasinski38416e52015-10-19 18:23:53 +02001988 smk_destroy_label_list(&tsp->smk_relabel);
1989
Casey Schaufler7898e1f2011-01-17 08:05:27 -08001990 list_for_each_safe(l, n, &tsp->smk_rules) {
1991 rp = list_entry(l, struct smack_rule, list);
1992 list_del(&rp->list);
1993 kfree(rp);
1994 }
1995 kfree(tsp);
Casey Schauflere114e472008-02-04 22:29:50 -08001996}
1997
1998/**
David Howellsd84f4f92008-11-14 10:39:23 +11001999 * smack_cred_prepare - prepare new set of credentials for modification
2000 * @new: the new credentials
2001 * @old: the original credentials
2002 * @gfp: the atomicity of any memory allocations
2003 *
2004 * Prepare a new set of credentials for modification.
2005 */
2006static int smack_cred_prepare(struct cred *new, const struct cred *old,
2007 gfp_t gfp)
2008{
Casey Schaufler676dac42010-12-02 06:43:39 -08002009 struct task_smack *old_tsp = old->security;
2010 struct task_smack *new_tsp;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08002011 int rc;
Casey Schaufler676dac42010-12-02 06:43:39 -08002012
Casey Schaufler7898e1f2011-01-17 08:05:27 -08002013 new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp);
Casey Schaufler676dac42010-12-02 06:43:39 -08002014 if (new_tsp == NULL)
2015 return -ENOMEM;
2016
Himanshu Shuklab437aba2016-11-10 16:17:02 +05302017 new->security = new_tsp;
2018
Casey Schaufler7898e1f2011-01-17 08:05:27 -08002019 rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp);
2020 if (rc != 0)
2021 return rc;
2022
Zbigniew Jasinski38416e52015-10-19 18:23:53 +02002023 rc = smk_copy_relabel(&new_tsp->smk_relabel, &old_tsp->smk_relabel,
2024 gfp);
2025 if (rc != 0)
2026 return rc;
2027
David Howellsd84f4f92008-11-14 10:39:23 +11002028 return 0;
2029}
2030
Randy Dunlap251a2a92009-02-18 11:42:33 -08002031/**
David Howellsee18d642009-09-02 09:14:21 +01002032 * smack_cred_transfer - Transfer the old credentials to the new credentials
2033 * @new: the new credentials
2034 * @old: the original credentials
2035 *
2036 * Fill in a set of blank credentials from another set of credentials.
2037 */
2038static void smack_cred_transfer(struct cred *new, const struct cred *old)
2039{
Casey Schaufler676dac42010-12-02 06:43:39 -08002040 struct task_smack *old_tsp = old->security;
2041 struct task_smack *new_tsp = new->security;
2042
2043 new_tsp->smk_task = old_tsp->smk_task;
2044 new_tsp->smk_forked = old_tsp->smk_task;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08002045 mutex_init(&new_tsp->smk_rules_lock);
2046 INIT_LIST_HEAD(&new_tsp->smk_rules);
2047
2048
2049 /* cbs copy rule list */
David Howellsee18d642009-09-02 09:14:21 +01002050}
2051
2052/**
David Howells3a3b7ce2008-11-14 10:39:28 +11002053 * smack_kernel_act_as - Set the subjective context in a set of credentials
Randy Dunlap251a2a92009-02-18 11:42:33 -08002054 * @new: points to the set of credentials to be modified.
2055 * @secid: specifies the security ID to be set
David Howells3a3b7ce2008-11-14 10:39:28 +11002056 *
2057 * Set the security data for a kernel service.
2058 */
2059static int smack_kernel_act_as(struct cred *new, u32 secid)
2060{
Casey Schaufler676dac42010-12-02 06:43:39 -08002061 struct task_smack *new_tsp = new->security;
David Howells3a3b7ce2008-11-14 10:39:28 +11002062
Casey Schaufler152f91d2016-11-14 09:38:15 -08002063 new_tsp->smk_task = smack_from_secid(secid);
David Howells3a3b7ce2008-11-14 10:39:28 +11002064 return 0;
2065}
2066
2067/**
2068 * smack_kernel_create_files_as - Set the file creation label in a set of creds
Randy Dunlap251a2a92009-02-18 11:42:33 -08002069 * @new: points to the set of credentials to be modified
2070 * @inode: points to the inode to use as a reference
David Howells3a3b7ce2008-11-14 10:39:28 +11002071 *
2072 * Set the file creation context in a set of credentials to the same
2073 * as the objective context of the specified inode
2074 */
2075static int smack_kernel_create_files_as(struct cred *new,
2076 struct inode *inode)
2077{
2078 struct inode_smack *isp = inode->i_security;
Casey Schaufler676dac42010-12-02 06:43:39 -08002079 struct task_smack *tsp = new->security;
David Howells3a3b7ce2008-11-14 10:39:28 +11002080
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02002081 tsp->smk_forked = isp->smk_inode;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002082 tsp->smk_task = tsp->smk_forked;
David Howells3a3b7ce2008-11-14 10:39:28 +11002083 return 0;
2084}
2085
2086/**
Etienne Bassetecfcc532009-04-08 20:40:06 +02002087 * smk_curacc_on_task - helper to log task related access
2088 * @p: the task object
Casey Schaufler531f1d42011-09-19 12:41:42 -07002089 * @access: the access requested
2090 * @caller: name of the calling function for audit
Etienne Bassetecfcc532009-04-08 20:40:06 +02002091 *
2092 * Return 0 if access is permitted
2093 */
Casey Schaufler531f1d42011-09-19 12:41:42 -07002094static int smk_curacc_on_task(struct task_struct *p, int access,
2095 const char *caller)
Etienne Bassetecfcc532009-04-08 20:40:06 +02002096{
2097 struct smk_audit_info ad;
Andrey Ryabinin6d1cff22015-01-13 18:52:40 +03002098 struct smack_known *skp = smk_of_task_struct(p);
Casey Schauflerd166c802014-08-27 14:51:27 -07002099 int rc;
Etienne Bassetecfcc532009-04-08 20:40:06 +02002100
Casey Schaufler531f1d42011-09-19 12:41:42 -07002101 smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK);
Etienne Bassetecfcc532009-04-08 20:40:06 +02002102 smk_ad_setfield_u_tsk(&ad, p);
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02002103 rc = smk_curacc(skp, access, &ad);
Casey Schauflerd166c802014-08-27 14:51:27 -07002104 rc = smk_bu_task(p, access, rc);
2105 return rc;
Etienne Bassetecfcc532009-04-08 20:40:06 +02002106}
2107
2108/**
Casey Schauflere114e472008-02-04 22:29:50 -08002109 * smack_task_setpgid - Smack check on setting pgid
2110 * @p: the task object
2111 * @pgid: unused
2112 *
2113 * Return 0 if write access is permitted
2114 */
2115static int smack_task_setpgid(struct task_struct *p, pid_t pgid)
2116{
Casey Schaufler531f1d42011-09-19 12:41:42 -07002117 return smk_curacc_on_task(p, MAY_WRITE, __func__);
Casey Schauflere114e472008-02-04 22:29:50 -08002118}
2119
2120/**
2121 * smack_task_getpgid - Smack access check for getpgid
2122 * @p: the object task
2123 *
2124 * Returns 0 if current can read the object task, error code otherwise
2125 */
2126static int smack_task_getpgid(struct task_struct *p)
2127{
Casey Schaufler531f1d42011-09-19 12:41:42 -07002128 return smk_curacc_on_task(p, MAY_READ, __func__);
Casey Schauflere114e472008-02-04 22:29:50 -08002129}
2130
2131/**
2132 * smack_task_getsid - Smack access check for getsid
2133 * @p: the object task
2134 *
2135 * Returns 0 if current can read the object task, error code otherwise
2136 */
2137static int smack_task_getsid(struct task_struct *p)
2138{
Casey Schaufler531f1d42011-09-19 12:41:42 -07002139 return smk_curacc_on_task(p, MAY_READ, __func__);
Casey Schauflere114e472008-02-04 22:29:50 -08002140}
2141
2142/**
2143 * smack_task_getsecid - get the secid of the task
2144 * @p: the object task
2145 * @secid: where to put the result
2146 *
2147 * Sets the secid to contain a u32 version of the smack label.
2148 */
2149static void smack_task_getsecid(struct task_struct *p, u32 *secid)
2150{
Andrey Ryabinin6d1cff22015-01-13 18:52:40 +03002151 struct smack_known *skp = smk_of_task_struct(p);
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002152
2153 *secid = skp->smk_secid;
Casey Schauflere114e472008-02-04 22:29:50 -08002154}
2155
2156/**
2157 * smack_task_setnice - Smack check on setting nice
2158 * @p: the task object
2159 * @nice: unused
2160 *
2161 * Return 0 if write access is permitted
2162 */
2163static int smack_task_setnice(struct task_struct *p, int nice)
2164{
Casey Schauflerb1d9e6b2015-05-02 15:11:42 -07002165 return smk_curacc_on_task(p, MAY_WRITE, __func__);
Casey Schauflere114e472008-02-04 22:29:50 -08002166}
2167
2168/**
2169 * smack_task_setioprio - Smack check on setting ioprio
2170 * @p: the task object
2171 * @ioprio: unused
2172 *
2173 * Return 0 if write access is permitted
2174 */
2175static int smack_task_setioprio(struct task_struct *p, int ioprio)
2176{
Casey Schauflerb1d9e6b2015-05-02 15:11:42 -07002177 return smk_curacc_on_task(p, MAY_WRITE, __func__);
Casey Schauflere114e472008-02-04 22:29:50 -08002178}
2179
2180/**
2181 * smack_task_getioprio - Smack check on reading ioprio
2182 * @p: the task object
2183 *
2184 * Return 0 if read access is permitted
2185 */
2186static int smack_task_getioprio(struct task_struct *p)
2187{
Casey Schaufler531f1d42011-09-19 12:41:42 -07002188 return smk_curacc_on_task(p, MAY_READ, __func__);
Casey Schauflere114e472008-02-04 22:29:50 -08002189}
2190
2191/**
2192 * smack_task_setscheduler - Smack check on setting scheduler
2193 * @p: the task object
2194 * @policy: unused
2195 * @lp: unused
2196 *
2197 * Return 0 if read access is permitted
2198 */
KOSAKI Motohirob0ae1982010-10-15 04:21:18 +09002199static int smack_task_setscheduler(struct task_struct *p)
Casey Schauflere114e472008-02-04 22:29:50 -08002200{
Casey Schauflerb1d9e6b2015-05-02 15:11:42 -07002201 return smk_curacc_on_task(p, MAY_WRITE, __func__);
Casey Schauflere114e472008-02-04 22:29:50 -08002202}
2203
2204/**
2205 * smack_task_getscheduler - Smack check on reading scheduler
2206 * @p: the task object
2207 *
2208 * Return 0 if read access is permitted
2209 */
2210static int smack_task_getscheduler(struct task_struct *p)
2211{
Casey Schaufler531f1d42011-09-19 12:41:42 -07002212 return smk_curacc_on_task(p, MAY_READ, __func__);
Casey Schauflere114e472008-02-04 22:29:50 -08002213}
2214
2215/**
2216 * smack_task_movememory - Smack check on moving memory
2217 * @p: the task object
2218 *
2219 * Return 0 if write access is permitted
2220 */
2221static int smack_task_movememory(struct task_struct *p)
2222{
Casey Schaufler531f1d42011-09-19 12:41:42 -07002223 return smk_curacc_on_task(p, MAY_WRITE, __func__);
Casey Schauflere114e472008-02-04 22:29:50 -08002224}
2225
2226/**
2227 * smack_task_kill - Smack check on signal delivery
2228 * @p: the task object
2229 * @info: unused
2230 * @sig: unused
2231 * @secid: identifies the smack to use in lieu of current's
2232 *
2233 * Return 0 if write access is permitted
2234 *
2235 * The secid behavior is an artifact of an SELinux hack
2236 * in the USB code. Someday it may go away.
2237 */
2238static int smack_task_kill(struct task_struct *p, struct siginfo *info,
2239 int sig, u32 secid)
2240{
Etienne Bassetecfcc532009-04-08 20:40:06 +02002241 struct smk_audit_info ad;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002242 struct smack_known *skp;
Andrey Ryabinin6d1cff22015-01-13 18:52:40 +03002243 struct smack_known *tkp = smk_of_task_struct(p);
Casey Schauflerd166c802014-08-27 14:51:27 -07002244 int rc;
Etienne Bassetecfcc532009-04-08 20:40:06 +02002245
Rafal Krypa18d872f2016-04-04 11:14:53 +02002246 if (!sig)
2247 return 0; /* null signal; existence test */
2248
Etienne Bassetecfcc532009-04-08 20:40:06 +02002249 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
2250 smk_ad_setfield_u_tsk(&ad, p);
Casey Schauflere114e472008-02-04 22:29:50 -08002251 /*
Casey Schauflere114e472008-02-04 22:29:50 -08002252 * Sending a signal requires that the sender
2253 * can write the receiver.
2254 */
Casey Schauflerd166c802014-08-27 14:51:27 -07002255 if (secid == 0) {
Casey Schauflerc60b9062016-08-30 10:31:39 -07002256 rc = smk_curacc(tkp, MAY_DELIVER, &ad);
2257 rc = smk_bu_task(p, MAY_DELIVER, rc);
Casey Schauflerd166c802014-08-27 14:51:27 -07002258 return rc;
2259 }
Casey Schauflere114e472008-02-04 22:29:50 -08002260 /*
2261 * If the secid isn't 0 we're dealing with some USB IO
2262 * specific behavior. This is not clean. For one thing
2263 * we can't take privilege into account.
2264 */
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002265 skp = smack_from_secid(secid);
Casey Schauflerc60b9062016-08-30 10:31:39 -07002266 rc = smk_access(skp, tkp, MAY_DELIVER, &ad);
2267 rc = smk_bu_note("USB signal", skp, tkp, MAY_DELIVER, rc);
Casey Schauflerd166c802014-08-27 14:51:27 -07002268 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -08002269}
2270
2271/**
Casey Schauflere114e472008-02-04 22:29:50 -08002272 * smack_task_to_inode - copy task smack into the inode blob
2273 * @p: task to copy from
Randy Dunlap251a2a92009-02-18 11:42:33 -08002274 * @inode: inode to copy to
Casey Schauflere114e472008-02-04 22:29:50 -08002275 *
2276 * Sets the smack pointer in the inode security blob
2277 */
2278static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
2279{
2280 struct inode_smack *isp = inode->i_security;
Andrey Ryabinin6d1cff22015-01-13 18:52:40 +03002281 struct smack_known *skp = smk_of_task_struct(p);
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002282
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02002283 isp->smk_inode = skp;
Casey Schauflere114e472008-02-04 22:29:50 -08002284}
2285
2286/*
2287 * Socket hooks.
2288 */
2289
2290/**
2291 * smack_sk_alloc_security - Allocate a socket blob
2292 * @sk: the socket
2293 * @family: unused
Randy Dunlap251a2a92009-02-18 11:42:33 -08002294 * @gfp_flags: memory allocation flags
Casey Schauflere114e472008-02-04 22:29:50 -08002295 *
2296 * Assign Smack pointers to current
2297 *
2298 * Returns 0 on success, -ENOMEM is there's no memory
2299 */
2300static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
2301{
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002302 struct smack_known *skp = smk_of_current();
Casey Schauflere114e472008-02-04 22:29:50 -08002303 struct socket_smack *ssp;
2304
2305 ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
2306 if (ssp == NULL)
2307 return -ENOMEM;
2308
jooseong lee08382c92016-11-03 11:54:39 +01002309 /*
2310 * Sockets created by kernel threads receive web label.
2311 */
2312 if (unlikely(current->flags & PF_KTHREAD)) {
2313 ssp->smk_in = &smack_known_web;
2314 ssp->smk_out = &smack_known_web;
2315 } else {
2316 ssp->smk_in = skp;
2317 ssp->smk_out = skp;
2318 }
Casey Schaufler272cd7a2011-09-20 12:24:36 -07002319 ssp->smk_packet = NULL;
Casey Schauflere114e472008-02-04 22:29:50 -08002320
2321 sk->sk_security = ssp;
2322
2323 return 0;
2324}
2325
2326/**
2327 * smack_sk_free_security - Free a socket blob
2328 * @sk: the socket
2329 *
2330 * Clears the blob pointer
2331 */
2332static void smack_sk_free_security(struct sock *sk)
2333{
Vishal Goel0c96d1f2016-11-23 10:32:54 +05302334#ifdef SMACK_IPV6_PORT_LABELING
2335 struct smk_port_label *spp;
2336
2337 if (sk->sk_family == PF_INET6) {
2338 rcu_read_lock();
2339 list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) {
2340 if (spp->smk_sock != sk)
2341 continue;
2342 spp->smk_can_reuse = 1;
2343 break;
2344 }
2345 rcu_read_unlock();
2346 }
2347#endif
Casey Schauflere114e472008-02-04 22:29:50 -08002348 kfree(sk->sk_security);
2349}
2350
2351/**
Casey Schaufler21abb1e2015-07-22 14:25:31 -07002352* smack_ipv4host_label - check host based restrictions
Paul Moore07feee82009-03-27 17:10:54 -04002353* @sip: the object end
2354*
2355* looks for host based access restrictions
2356*
2357* This version will only be appropriate for really small sets of single label
2358* hosts. The caller is responsible for ensuring that the RCU read lock is
2359* taken before calling this function.
2360*
2361* Returns the label of the far end or NULL if it's not special.
2362*/
Casey Schaufler21abb1e2015-07-22 14:25:31 -07002363static struct smack_known *smack_ipv4host_label(struct sockaddr_in *sip)
Paul Moore07feee82009-03-27 17:10:54 -04002364{
Casey Schaufler21abb1e2015-07-22 14:25:31 -07002365 struct smk_net4addr *snp;
Paul Moore07feee82009-03-27 17:10:54 -04002366 struct in_addr *siap = &sip->sin_addr;
2367
2368 if (siap->s_addr == 0)
2369 return NULL;
2370
Casey Schaufler21abb1e2015-07-22 14:25:31 -07002371 list_for_each_entry_rcu(snp, &smk_net4addr_list, list)
2372 /*
2373 * we break after finding the first match because
2374 * the list is sorted from longest to shortest mask
2375 * so we have found the most specific match
2376 */
2377 if (snp->smk_host.s_addr ==
2378 (siap->s_addr & snp->smk_mask.s_addr))
2379 return snp->smk_label;
2380
2381 return NULL;
2382}
2383
2384#if IS_ENABLED(CONFIG_IPV6)
2385/*
2386 * smk_ipv6_localhost - Check for local ipv6 host address
2387 * @sip: the address
2388 *
2389 * Returns boolean true if this is the localhost address
2390 */
2391static bool smk_ipv6_localhost(struct sockaddr_in6 *sip)
2392{
2393 __be16 *be16p = (__be16 *)&sip->sin6_addr;
2394 __be32 *be32p = (__be32 *)&sip->sin6_addr;
2395
2396 if (be32p[0] == 0 && be32p[1] == 0 && be32p[2] == 0 && be16p[6] == 0 &&
2397 ntohs(be16p[7]) == 1)
2398 return true;
2399 return false;
2400}
2401
2402/**
2403* smack_ipv6host_label - check host based restrictions
2404* @sip: the object end
2405*
2406* looks for host based access restrictions
2407*
2408* This version will only be appropriate for really small sets of single label
2409* hosts. The caller is responsible for ensuring that the RCU read lock is
2410* taken before calling this function.
2411*
2412* Returns the label of the far end or NULL if it's not special.
2413*/
2414static struct smack_known *smack_ipv6host_label(struct sockaddr_in6 *sip)
2415{
2416 struct smk_net6addr *snp;
2417 struct in6_addr *sap = &sip->sin6_addr;
2418 int i;
2419 int found = 0;
2420
2421 /*
2422 * It's local. Don't look for a host label.
2423 */
2424 if (smk_ipv6_localhost(sip))
2425 return NULL;
2426
2427 list_for_each_entry_rcu(snp, &smk_net6addr_list, list) {
Paul Moore07feee82009-03-27 17:10:54 -04002428 /*
Casey Schaufler2e4939f2016-11-07 19:01:09 -08002429 * If the label is NULL the entry has
2430 * been renounced. Ignore it.
2431 */
2432 if (snp->smk_label == NULL)
2433 continue;
2434 /*
Paul Moore07feee82009-03-27 17:10:54 -04002435 * we break after finding the first match because
2436 * the list is sorted from longest to shortest mask
2437 * so we have found the most specific match
2438 */
Casey Schaufler21abb1e2015-07-22 14:25:31 -07002439 for (found = 1, i = 0; i < 8; i++) {
Casey Schaufler21abb1e2015-07-22 14:25:31 -07002440 if ((sap->s6_addr16[i] & snp->smk_mask.s6_addr16[i]) !=
2441 snp->smk_host.s6_addr16[i]) {
2442 found = 0;
2443 break;
2444 }
Etienne Basset43031542009-03-27 17:11:01 -04002445 }
Casey Schaufler21abb1e2015-07-22 14:25:31 -07002446 if (found)
2447 return snp->smk_label;
2448 }
Paul Moore07feee82009-03-27 17:10:54 -04002449
2450 return NULL;
2451}
Casey Schaufler21abb1e2015-07-22 14:25:31 -07002452#endif /* CONFIG_IPV6 */
Paul Moore07feee82009-03-27 17:10:54 -04002453
2454/**
Casey Schauflere114e472008-02-04 22:29:50 -08002455 * smack_netlabel - Set the secattr on a socket
2456 * @sk: the socket
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002457 * @labeled: socket label scheme
Casey Schauflere114e472008-02-04 22:29:50 -08002458 *
2459 * Convert the outbound smack value (smk_out) to a
2460 * secattr and attach it to the socket.
2461 *
2462 * Returns 0 on success or an error code
2463 */
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002464static int smack_netlabel(struct sock *sk, int labeled)
Casey Schauflere114e472008-02-04 22:29:50 -08002465{
Casey Schauflerf7112e62012-05-06 15:22:02 -07002466 struct smack_known *skp;
Paul Moore07feee82009-03-27 17:10:54 -04002467 struct socket_smack *ssp = sk->sk_security;
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002468 int rc = 0;
Casey Schauflere114e472008-02-04 22:29:50 -08002469
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002470 /*
2471 * Usually the netlabel code will handle changing the
2472 * packet labeling based on the label.
2473 * The case of a single label host is different, because
2474 * a single label host should never get a labeled packet
2475 * even though the label is usually associated with a packet
2476 * label.
2477 */
2478 local_bh_disable();
2479 bh_lock_sock_nested(sk);
2480
2481 if (ssp->smk_out == smack_net_ambient ||
2482 labeled == SMACK_UNLABELED_SOCKET)
2483 netlbl_sock_delattr(sk);
2484 else {
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002485 skp = ssp->smk_out;
Casey Schauflerf7112e62012-05-06 15:22:02 -07002486 rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel);
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002487 }
2488
2489 bh_unlock_sock(sk);
2490 local_bh_enable();
Casey Schaufler4bc87e62008-02-15 15:24:25 -08002491
Casey Schauflere114e472008-02-04 22:29:50 -08002492 return rc;
2493}
2494
2495/**
Paul Moore07feee82009-03-27 17:10:54 -04002496 * smack_netlbel_send - Set the secattr on a socket and perform access checks
2497 * @sk: the socket
2498 * @sap: the destination address
2499 *
2500 * Set the correct secattr for the given socket based on the destination
2501 * address and perform any outbound access checks needed.
2502 *
2503 * Returns 0 on success or an error code.
2504 *
2505 */
2506static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap)
2507{
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002508 struct smack_known *skp;
Paul Moore07feee82009-03-27 17:10:54 -04002509 int rc;
2510 int sk_lbl;
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02002511 struct smack_known *hkp;
Paul Moore07feee82009-03-27 17:10:54 -04002512 struct socket_smack *ssp = sk->sk_security;
Etienne Bassetecfcc532009-04-08 20:40:06 +02002513 struct smk_audit_info ad;
Paul Moore07feee82009-03-27 17:10:54 -04002514
2515 rcu_read_lock();
Casey Schaufler21abb1e2015-07-22 14:25:31 -07002516 hkp = smack_ipv4host_label(sap);
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02002517 if (hkp != NULL) {
Etienne Bassetecfcc532009-04-08 20:40:06 +02002518#ifdef CONFIG_AUDIT
Kees Cook923e9a12012-04-10 13:26:44 -07002519 struct lsm_network_audit net;
2520
Eric Paris48c62af2012-04-02 13:15:44 -04002521 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2522 ad.a.u.net->family = sap->sin_family;
2523 ad.a.u.net->dport = sap->sin_port;
2524 ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr;
Etienne Bassetecfcc532009-04-08 20:40:06 +02002525#endif
Kees Cook923e9a12012-04-10 13:26:44 -07002526 sk_lbl = SMACK_UNLABELED_SOCKET;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002527 skp = ssp->smk_out;
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02002528 rc = smk_access(skp, hkp, MAY_WRITE, &ad);
2529 rc = smk_bu_note("IPv4 host check", skp, hkp, MAY_WRITE, rc);
Paul Moore07feee82009-03-27 17:10:54 -04002530 } else {
2531 sk_lbl = SMACK_CIPSO_SOCKET;
2532 rc = 0;
2533 }
2534 rcu_read_unlock();
2535 if (rc != 0)
2536 return rc;
2537
2538 return smack_netlabel(sk, sk_lbl);
2539}
2540
Casey Schaufler21abb1e2015-07-22 14:25:31 -07002541#if IS_ENABLED(CONFIG_IPV6)
2542/**
2543 * smk_ipv6_check - check Smack access
2544 * @subject: subject Smack label
2545 * @object: object Smack label
2546 * @address: address
2547 * @act: the action being taken
2548 *
2549 * Check an IPv6 access
2550 */
2551static int smk_ipv6_check(struct smack_known *subject,
2552 struct smack_known *object,
2553 struct sockaddr_in6 *address, int act)
2554{
2555#ifdef CONFIG_AUDIT
2556 struct lsm_network_audit net;
2557#endif
2558 struct smk_audit_info ad;
2559 int rc;
2560
2561#ifdef CONFIG_AUDIT
2562 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2563 ad.a.u.net->family = PF_INET6;
2564 ad.a.u.net->dport = ntohs(address->sin6_port);
2565 if (act == SMK_RECEIVING)
2566 ad.a.u.net->v6info.saddr = address->sin6_addr;
2567 else
2568 ad.a.u.net->v6info.daddr = address->sin6_addr;
2569#endif
2570 rc = smk_access(subject, object, MAY_WRITE, &ad);
2571 rc = smk_bu_note("IPv6 check", subject, object, MAY_WRITE, rc);
2572 return rc;
2573}
2574#endif /* CONFIG_IPV6 */
2575
2576#ifdef SMACK_IPV6_PORT_LABELING
Paul Moore07feee82009-03-27 17:10:54 -04002577/**
Casey Schauflerc6739442013-05-22 18:42:56 -07002578 * smk_ipv6_port_label - Smack port access table management
2579 * @sock: socket
2580 * @address: address
2581 *
2582 * Create or update the port list entry
2583 */
2584static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address)
2585{
2586 struct sock *sk = sock->sk;
2587 struct sockaddr_in6 *addr6;
2588 struct socket_smack *ssp = sock->sk->sk_security;
2589 struct smk_port_label *spp;
2590 unsigned short port = 0;
2591
2592 if (address == NULL) {
2593 /*
2594 * This operation is changing the Smack information
2595 * on the bound socket. Take the changes to the port
2596 * as well.
2597 */
Vishal Goel3c7ce342016-11-23 10:31:08 +05302598 rcu_read_lock();
2599 list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) {
Casey Schauflerc6739442013-05-22 18:42:56 -07002600 if (sk != spp->smk_sock)
2601 continue;
2602 spp->smk_in = ssp->smk_in;
2603 spp->smk_out = ssp->smk_out;
Vishal Goel3c7ce342016-11-23 10:31:08 +05302604 rcu_read_unlock();
Casey Schauflerc6739442013-05-22 18:42:56 -07002605 return;
2606 }
2607 /*
2608 * A NULL address is only used for updating existing
2609 * bound entries. If there isn't one, it's OK.
2610 */
Vishal Goel3c7ce342016-11-23 10:31:08 +05302611 rcu_read_unlock();
Casey Schauflerc6739442013-05-22 18:42:56 -07002612 return;
2613 }
2614
2615 addr6 = (struct sockaddr_in6 *)address;
2616 port = ntohs(addr6->sin6_port);
2617 /*
2618 * This is a special case that is safely ignored.
2619 */
2620 if (port == 0)
2621 return;
2622
2623 /*
2624 * Look for an existing port list entry.
2625 * This is an indication that a port is getting reused.
2626 */
Vishal Goel3c7ce342016-11-23 10:31:08 +05302627 rcu_read_lock();
2628 list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) {
Vishal Goel9d44c972016-11-23 10:31:59 +05302629 if (spp->smk_port != port || spp->smk_sock_type != sock->type)
Casey Schauflerc6739442013-05-22 18:42:56 -07002630 continue;
Vishal Goel0c96d1f2016-11-23 10:32:54 +05302631 if (spp->smk_can_reuse != 1) {
2632 rcu_read_unlock();
2633 return;
2634 }
Casey Schauflerc6739442013-05-22 18:42:56 -07002635 spp->smk_port = port;
2636 spp->smk_sock = sk;
2637 spp->smk_in = ssp->smk_in;
2638 spp->smk_out = ssp->smk_out;
Vishal Goel0c96d1f2016-11-23 10:32:54 +05302639 spp->smk_can_reuse = 0;
Vishal Goel3c7ce342016-11-23 10:31:08 +05302640 rcu_read_unlock();
Casey Schauflerc6739442013-05-22 18:42:56 -07002641 return;
2642 }
Vishal Goel3c7ce342016-11-23 10:31:08 +05302643 rcu_read_unlock();
Casey Schauflerc6739442013-05-22 18:42:56 -07002644 /*
2645 * A new port entry is required.
2646 */
2647 spp = kzalloc(sizeof(*spp), GFP_KERNEL);
2648 if (spp == NULL)
2649 return;
2650
2651 spp->smk_port = port;
2652 spp->smk_sock = sk;
2653 spp->smk_in = ssp->smk_in;
2654 spp->smk_out = ssp->smk_out;
Vishal Goel9d44c972016-11-23 10:31:59 +05302655 spp->smk_sock_type = sock->type;
Vishal Goel0c96d1f2016-11-23 10:32:54 +05302656 spp->smk_can_reuse = 0;
Casey Schauflerc6739442013-05-22 18:42:56 -07002657
Vishal Goel3c7ce342016-11-23 10:31:08 +05302658 mutex_lock(&smack_ipv6_lock);
2659 list_add_rcu(&spp->list, &smk_ipv6_port_list);
2660 mutex_unlock(&smack_ipv6_lock);
Casey Schauflerc6739442013-05-22 18:42:56 -07002661 return;
2662}
2663
2664/**
2665 * smk_ipv6_port_check - check Smack port access
2666 * @sock: socket
2667 * @address: address
2668 *
2669 * Create or update the port list entry
2670 */
Casey Schaufler6ea06242013-08-05 13:21:22 -07002671static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address,
Casey Schauflerc6739442013-05-22 18:42:56 -07002672 int act)
2673{
Casey Schauflerc6739442013-05-22 18:42:56 -07002674 struct smk_port_label *spp;
2675 struct socket_smack *ssp = sk->sk_security;
Casey Schaufler21abb1e2015-07-22 14:25:31 -07002676 struct smack_known *skp = NULL;
2677 unsigned short port;
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02002678 struct smack_known *object;
Casey Schauflerc6739442013-05-22 18:42:56 -07002679
2680 if (act == SMK_RECEIVING) {
Casey Schaufler21abb1e2015-07-22 14:25:31 -07002681 skp = smack_ipv6host_label(address);
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02002682 object = ssp->smk_in;
Casey Schauflerc6739442013-05-22 18:42:56 -07002683 } else {
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002684 skp = ssp->smk_out;
Casey Schaufler21abb1e2015-07-22 14:25:31 -07002685 object = smack_ipv6host_label(address);
Casey Schauflerc6739442013-05-22 18:42:56 -07002686 }
2687
2688 /*
Casey Schaufler21abb1e2015-07-22 14:25:31 -07002689 * The other end is a single label host.
Casey Schauflerc6739442013-05-22 18:42:56 -07002690 */
Casey Schaufler21abb1e2015-07-22 14:25:31 -07002691 if (skp != NULL && object != NULL)
2692 return smk_ipv6_check(skp, object, address, act);
2693 if (skp == NULL)
2694 skp = smack_net_ambient;
2695 if (object == NULL)
2696 object = smack_net_ambient;
Casey Schauflerc6739442013-05-22 18:42:56 -07002697
2698 /*
2699 * It's remote, so port lookup does no good.
2700 */
Casey Schaufler21abb1e2015-07-22 14:25:31 -07002701 if (!smk_ipv6_localhost(address))
2702 return smk_ipv6_check(skp, object, address, act);
Casey Schauflerc6739442013-05-22 18:42:56 -07002703
2704 /*
2705 * It's local so the send check has to have passed.
2706 */
Casey Schaufler21abb1e2015-07-22 14:25:31 -07002707 if (act == SMK_RECEIVING)
2708 return 0;
Casey Schauflerc6739442013-05-22 18:42:56 -07002709
Casey Schaufler21abb1e2015-07-22 14:25:31 -07002710 port = ntohs(address->sin6_port);
Vishal Goel3c7ce342016-11-23 10:31:08 +05302711 rcu_read_lock();
2712 list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) {
Vishal Goel9d44c972016-11-23 10:31:59 +05302713 if (spp->smk_port != port || spp->smk_sock_type != sk->sk_type)
Casey Schauflerc6739442013-05-22 18:42:56 -07002714 continue;
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02002715 object = spp->smk_in;
Casey Schauflerc6739442013-05-22 18:42:56 -07002716 if (act == SMK_CONNECTING)
Casey Schaufler54e70ec2014-04-10 16:37:08 -07002717 ssp->smk_packet = spp->smk_out;
Casey Schauflerc6739442013-05-22 18:42:56 -07002718 break;
2719 }
Vishal Goel3c7ce342016-11-23 10:31:08 +05302720 rcu_read_unlock();
Casey Schauflerc6739442013-05-22 18:42:56 -07002721
Casey Schaufler21abb1e2015-07-22 14:25:31 -07002722 return smk_ipv6_check(skp, object, address, act);
Casey Schauflerc6739442013-05-22 18:42:56 -07002723}
Casey Schaufler21abb1e2015-07-22 14:25:31 -07002724#endif /* SMACK_IPV6_PORT_LABELING */
Casey Schauflerc6739442013-05-22 18:42:56 -07002725
2726/**
Casey Schauflere114e472008-02-04 22:29:50 -08002727 * smack_inode_setsecurity - set smack xattrs
2728 * @inode: the object
2729 * @name: attribute name
2730 * @value: attribute value
2731 * @size: size of the attribute
2732 * @flags: unused
2733 *
2734 * Sets the named attribute in the appropriate blob
2735 *
2736 * Returns 0 on success, or an error code
2737 */
2738static int smack_inode_setsecurity(struct inode *inode, const char *name,
2739 const void *value, size_t size, int flags)
2740{
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002741 struct smack_known *skp;
Casey Schauflere114e472008-02-04 22:29:50 -08002742 struct inode_smack *nsp = inode->i_security;
2743 struct socket_smack *ssp;
2744 struct socket *sock;
Casey Schaufler4bc87e62008-02-15 15:24:25 -08002745 int rc = 0;
Casey Schauflere114e472008-02-04 22:29:50 -08002746
Casey Schauflerf7112e62012-05-06 15:22:02 -07002747 if (value == NULL || size > SMK_LONGLABEL || size == 0)
Pankaj Kumar5e9ab592013-12-13 15:12:22 +05302748 return -EINVAL;
Casey Schauflere114e472008-02-04 22:29:50 -08002749
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002750 skp = smk_import_entry(value, size);
Lukasz Pawelczyke774ad62015-04-20 17:12:54 +02002751 if (IS_ERR(skp))
2752 return PTR_ERR(skp);
Casey Schauflere114e472008-02-04 22:29:50 -08002753
2754 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02002755 nsp->smk_inode = skp;
David P. Quigleyddd29ec2009-09-09 14:25:37 -04002756 nsp->smk_flags |= SMK_INODE_INSTANT;
Casey Schauflere114e472008-02-04 22:29:50 -08002757 return 0;
2758 }
2759 /*
2760 * The rest of the Smack xattrs are only on sockets.
2761 */
2762 if (inode->i_sb->s_magic != SOCKFS_MAGIC)
2763 return -EOPNOTSUPP;
2764
2765 sock = SOCKET_I(inode);
Ahmed S. Darwish2e1d1462008-02-13 15:03:34 -08002766 if (sock == NULL || sock->sk == NULL)
Casey Schauflere114e472008-02-04 22:29:50 -08002767 return -EOPNOTSUPP;
2768
2769 ssp = sock->sk->sk_security;
2770
2771 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
Casey Schaufler54e70ec2014-04-10 16:37:08 -07002772 ssp->smk_in = skp;
Casey Schauflere114e472008-02-04 22:29:50 -08002773 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) {
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002774 ssp->smk_out = skp;
Casey Schauflerc6739442013-05-22 18:42:56 -07002775 if (sock->sk->sk_family == PF_INET) {
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08002776 rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
2777 if (rc != 0)
2778 printk(KERN_WARNING
2779 "Smack: \"%s\" netlbl error %d.\n",
2780 __func__, -rc);
2781 }
Casey Schauflere114e472008-02-04 22:29:50 -08002782 } else
2783 return -EOPNOTSUPP;
2784
Casey Schaufler21abb1e2015-07-22 14:25:31 -07002785#ifdef SMACK_IPV6_PORT_LABELING
Casey Schauflerc6739442013-05-22 18:42:56 -07002786 if (sock->sk->sk_family == PF_INET6)
2787 smk_ipv6_port_label(sock, NULL);
Casey Schaufler21abb1e2015-07-22 14:25:31 -07002788#endif
Casey Schauflerc6739442013-05-22 18:42:56 -07002789
Casey Schauflere114e472008-02-04 22:29:50 -08002790 return 0;
2791}
2792
2793/**
2794 * smack_socket_post_create - finish socket setup
2795 * @sock: the socket
2796 * @family: protocol family
2797 * @type: unused
2798 * @protocol: unused
2799 * @kern: unused
2800 *
2801 * Sets the netlabel information on the socket
2802 *
2803 * Returns 0 on success, and error code otherwise
2804 */
2805static int smack_socket_post_create(struct socket *sock, int family,
2806 int type, int protocol, int kern)
2807{
Marcin Lis74123012015-01-22 15:40:33 +01002808 struct socket_smack *ssp;
2809
2810 if (sock->sk == NULL)
2811 return 0;
2812
2813 /*
2814 * Sockets created by kernel threads receive web label.
2815 */
2816 if (unlikely(current->flags & PF_KTHREAD)) {
2817 ssp = sock->sk->sk_security;
2818 ssp->smk_in = &smack_known_web;
2819 ssp->smk_out = &smack_known_web;
2820 }
2821
2822 if (family != PF_INET)
Casey Schauflere114e472008-02-04 22:29:50 -08002823 return 0;
2824 /*
2825 * Set the outbound netlbl.
2826 */
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002827 return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
2828}
2829
Casey Schaufler21abb1e2015-07-22 14:25:31 -07002830#ifdef SMACK_IPV6_PORT_LABELING
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002831/**
Casey Schauflerc6739442013-05-22 18:42:56 -07002832 * smack_socket_bind - record port binding information.
2833 * @sock: the socket
2834 * @address: the port address
2835 * @addrlen: size of the address
2836 *
2837 * Records the label bound to a port.
2838 *
2839 * Returns 0
2840 */
2841static int smack_socket_bind(struct socket *sock, struct sockaddr *address,
2842 int addrlen)
2843{
2844 if (sock->sk != NULL && sock->sk->sk_family == PF_INET6)
2845 smk_ipv6_port_label(sock, address);
Casey Schauflerc6739442013-05-22 18:42:56 -07002846 return 0;
2847}
Casey Schaufler21abb1e2015-07-22 14:25:31 -07002848#endif /* SMACK_IPV6_PORT_LABELING */
Casey Schauflerc6739442013-05-22 18:42:56 -07002849
2850/**
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002851 * smack_socket_connect - connect access check
2852 * @sock: the socket
2853 * @sap: the other end
2854 * @addrlen: size of sap
2855 *
2856 * Verifies that a connection may be possible
2857 *
2858 * Returns 0 on success, and error code otherwise
2859 */
2860static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
2861 int addrlen)
2862{
Casey Schauflerc6739442013-05-22 18:42:56 -07002863 int rc = 0;
Casey Schaufler21abb1e2015-07-22 14:25:31 -07002864#if IS_ENABLED(CONFIG_IPV6)
2865 struct sockaddr_in6 *sip = (struct sockaddr_in6 *)sap;
2866#endif
2867#ifdef SMACK_IPV6_SECMARK_LABELING
2868 struct smack_known *rsp;
Vasyl Gomonovychda49b5d2017-12-21 16:57:52 +01002869 struct socket_smack *ssp;
Casey Schaufler21abb1e2015-07-22 14:25:31 -07002870#endif
Casey Schaufler6d3dc072008-12-31 12:54:12 -05002871
Casey Schauflerc6739442013-05-22 18:42:56 -07002872 if (sock->sk == NULL)
2873 return 0;
2874
Vasyl Gomonovychda49b5d2017-12-21 16:57:52 +01002875#ifdef SMACK_IPV6_SECMARK_LABELING
2876 ssp = sock->sk->sk_security;
2877#endif
2878
Casey Schauflerc6739442013-05-22 18:42:56 -07002879 switch (sock->sk->sk_family) {
2880 case PF_INET:
2881 if (addrlen < sizeof(struct sockaddr_in))
2882 return -EINVAL;
2883 rc = smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap);
2884 break;
2885 case PF_INET6:
2886 if (addrlen < sizeof(struct sockaddr_in6))
2887 return -EINVAL;
Casey Schaufler21abb1e2015-07-22 14:25:31 -07002888#ifdef SMACK_IPV6_SECMARK_LABELING
2889 rsp = smack_ipv6host_label(sip);
2890 if (rsp != NULL)
2891 rc = smk_ipv6_check(ssp->smk_out, rsp, sip,
Casey Schaufler6ea06242013-08-05 13:21:22 -07002892 SMK_CONNECTING);
Casey Schaufler21abb1e2015-07-22 14:25:31 -07002893#endif
2894#ifdef SMACK_IPV6_PORT_LABELING
2895 rc = smk_ipv6_port_check(sock->sk, sip, SMK_CONNECTING);
2896#endif
Casey Schauflerc6739442013-05-22 18:42:56 -07002897 break;
2898 }
2899 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -08002900}
2901
2902/**
2903 * smack_flags_to_may - convert S_ to MAY_ values
2904 * @flags: the S_ value
2905 *
2906 * Returns the equivalent MAY_ value
2907 */
2908static int smack_flags_to_may(int flags)
2909{
2910 int may = 0;
2911
2912 if (flags & S_IRUGO)
2913 may |= MAY_READ;
2914 if (flags & S_IWUGO)
2915 may |= MAY_WRITE;
2916 if (flags & S_IXUGO)
2917 may |= MAY_EXEC;
2918
2919 return may;
2920}
2921
2922/**
2923 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
2924 * @msg: the object
2925 *
2926 * Returns 0
2927 */
2928static int smack_msg_msg_alloc_security(struct msg_msg *msg)
2929{
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002930 struct smack_known *skp = smk_of_current();
2931
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02002932 msg->security = skp;
Casey Schauflere114e472008-02-04 22:29:50 -08002933 return 0;
2934}
2935
2936/**
2937 * smack_msg_msg_free_security - Clear the security blob for msg_msg
2938 * @msg: the object
2939 *
2940 * Clears the blob pointer
2941 */
2942static void smack_msg_msg_free_security(struct msg_msg *msg)
2943{
2944 msg->security = NULL;
2945}
2946
2947/**
2948 * smack_of_shm - the smack pointer for the shm
2949 * @shp: the object
2950 *
2951 * Returns a pointer to the smack value
2952 */
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02002953static struct smack_known *smack_of_shm(struct shmid_kernel *shp)
Casey Schauflere114e472008-02-04 22:29:50 -08002954{
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02002955 return (struct smack_known *)shp->shm_perm.security;
Casey Schauflere114e472008-02-04 22:29:50 -08002956}
2957
2958/**
2959 * smack_shm_alloc_security - Set the security blob for shm
2960 * @shp: the object
2961 *
2962 * Returns 0
2963 */
2964static int smack_shm_alloc_security(struct shmid_kernel *shp)
2965{
2966 struct kern_ipc_perm *isp = &shp->shm_perm;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07002967 struct smack_known *skp = smk_of_current();
Casey Schauflere114e472008-02-04 22:29:50 -08002968
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02002969 isp->security = skp;
Casey Schauflere114e472008-02-04 22:29:50 -08002970 return 0;
2971}
2972
2973/**
2974 * smack_shm_free_security - Clear the security blob for shm
2975 * @shp: the object
2976 *
2977 * Clears the blob pointer
2978 */
2979static void smack_shm_free_security(struct shmid_kernel *shp)
2980{
2981 struct kern_ipc_perm *isp = &shp->shm_perm;
2982
2983 isp->security = NULL;
2984}
2985
2986/**
Etienne Bassetecfcc532009-04-08 20:40:06 +02002987 * smk_curacc_shm : check if current has access on shm
2988 * @shp : the object
2989 * @access : access requested
2990 *
2991 * Returns 0 if current has the requested access, error code otherwise
2992 */
2993static int smk_curacc_shm(struct shmid_kernel *shp, int access)
2994{
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02002995 struct smack_known *ssp = smack_of_shm(shp);
Etienne Bassetecfcc532009-04-08 20:40:06 +02002996 struct smk_audit_info ad;
Casey Schauflerd166c802014-08-27 14:51:27 -07002997 int rc;
Etienne Bassetecfcc532009-04-08 20:40:06 +02002998
2999#ifdef CONFIG_AUDIT
3000 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3001 ad.a.u.ipc_id = shp->shm_perm.id;
3002#endif
Casey Schauflerd166c802014-08-27 14:51:27 -07003003 rc = smk_curacc(ssp, access, &ad);
3004 rc = smk_bu_current("shm", ssp, access, rc);
3005 return rc;
Etienne Bassetecfcc532009-04-08 20:40:06 +02003006}
3007
3008/**
Casey Schauflere114e472008-02-04 22:29:50 -08003009 * smack_shm_associate - Smack access check for shm
3010 * @shp: the object
3011 * @shmflg: access requested
3012 *
3013 * Returns 0 if current has the requested access, error code otherwise
3014 */
3015static int smack_shm_associate(struct shmid_kernel *shp, int shmflg)
3016{
Casey Schauflere114e472008-02-04 22:29:50 -08003017 int may;
3018
3019 may = smack_flags_to_may(shmflg);
Etienne Bassetecfcc532009-04-08 20:40:06 +02003020 return smk_curacc_shm(shp, may);
Casey Schauflere114e472008-02-04 22:29:50 -08003021}
3022
3023/**
3024 * smack_shm_shmctl - Smack access check for shm
3025 * @shp: the object
3026 * @cmd: what it wants to do
3027 *
3028 * Returns 0 if current has the requested access, error code otherwise
3029 */
3030static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd)
3031{
Casey Schauflere114e472008-02-04 22:29:50 -08003032 int may;
3033
3034 switch (cmd) {
3035 case IPC_STAT:
3036 case SHM_STAT:
3037 may = MAY_READ;
3038 break;
3039 case IPC_SET:
3040 case SHM_LOCK:
3041 case SHM_UNLOCK:
3042 case IPC_RMID:
3043 may = MAY_READWRITE;
3044 break;
3045 case IPC_INFO:
3046 case SHM_INFO:
3047 /*
3048 * System level information.
3049 */
3050 return 0;
3051 default:
3052 return -EINVAL;
3053 }
Etienne Bassetecfcc532009-04-08 20:40:06 +02003054 return smk_curacc_shm(shp, may);
Casey Schauflere114e472008-02-04 22:29:50 -08003055}
3056
3057/**
3058 * smack_shm_shmat - Smack access for shmat
3059 * @shp: the object
3060 * @shmaddr: unused
3061 * @shmflg: access requested
3062 *
3063 * Returns 0 if current has the requested access, error code otherwise
3064 */
3065static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr,
3066 int shmflg)
3067{
Casey Schauflere114e472008-02-04 22:29:50 -08003068 int may;
3069
3070 may = smack_flags_to_may(shmflg);
Etienne Bassetecfcc532009-04-08 20:40:06 +02003071 return smk_curacc_shm(shp, may);
Casey Schauflere114e472008-02-04 22:29:50 -08003072}
3073
3074/**
3075 * smack_of_sem - the smack pointer for the sem
3076 * @sma: the object
3077 *
3078 * Returns a pointer to the smack value
3079 */
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02003080static struct smack_known *smack_of_sem(struct sem_array *sma)
Casey Schauflere114e472008-02-04 22:29:50 -08003081{
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02003082 return (struct smack_known *)sma->sem_perm.security;
Casey Schauflere114e472008-02-04 22:29:50 -08003083}
3084
3085/**
3086 * smack_sem_alloc_security - Set the security blob for sem
3087 * @sma: the object
3088 *
3089 * Returns 0
3090 */
3091static int smack_sem_alloc_security(struct sem_array *sma)
3092{
3093 struct kern_ipc_perm *isp = &sma->sem_perm;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003094 struct smack_known *skp = smk_of_current();
Casey Schauflere114e472008-02-04 22:29:50 -08003095
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02003096 isp->security = skp;
Casey Schauflere114e472008-02-04 22:29:50 -08003097 return 0;
3098}
3099
3100/**
3101 * smack_sem_free_security - Clear the security blob for sem
3102 * @sma: the object
3103 *
3104 * Clears the blob pointer
3105 */
3106static void smack_sem_free_security(struct sem_array *sma)
3107{
3108 struct kern_ipc_perm *isp = &sma->sem_perm;
3109
3110 isp->security = NULL;
3111}
3112
3113/**
Etienne Bassetecfcc532009-04-08 20:40:06 +02003114 * smk_curacc_sem : check if current has access on sem
3115 * @sma : the object
3116 * @access : access requested
3117 *
3118 * Returns 0 if current has the requested access, error code otherwise
3119 */
3120static int smk_curacc_sem(struct sem_array *sma, int access)
3121{
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02003122 struct smack_known *ssp = smack_of_sem(sma);
Etienne Bassetecfcc532009-04-08 20:40:06 +02003123 struct smk_audit_info ad;
Casey Schauflerd166c802014-08-27 14:51:27 -07003124 int rc;
Etienne Bassetecfcc532009-04-08 20:40:06 +02003125
3126#ifdef CONFIG_AUDIT
3127 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3128 ad.a.u.ipc_id = sma->sem_perm.id;
3129#endif
Casey Schauflerd166c802014-08-27 14:51:27 -07003130 rc = smk_curacc(ssp, access, &ad);
3131 rc = smk_bu_current("sem", ssp, access, rc);
3132 return rc;
Etienne Bassetecfcc532009-04-08 20:40:06 +02003133}
3134
3135/**
Casey Schauflere114e472008-02-04 22:29:50 -08003136 * smack_sem_associate - Smack access check for sem
3137 * @sma: the object
3138 * @semflg: access requested
3139 *
3140 * Returns 0 if current has the requested access, error code otherwise
3141 */
3142static int smack_sem_associate(struct sem_array *sma, int semflg)
3143{
Casey Schauflere114e472008-02-04 22:29:50 -08003144 int may;
3145
3146 may = smack_flags_to_may(semflg);
Etienne Bassetecfcc532009-04-08 20:40:06 +02003147 return smk_curacc_sem(sma, may);
Casey Schauflere114e472008-02-04 22:29:50 -08003148}
3149
3150/**
3151 * smack_sem_shmctl - Smack access check for sem
3152 * @sma: the object
3153 * @cmd: what it wants to do
3154 *
3155 * Returns 0 if current has the requested access, error code otherwise
3156 */
3157static int smack_sem_semctl(struct sem_array *sma, int cmd)
3158{
Casey Schauflere114e472008-02-04 22:29:50 -08003159 int may;
3160
3161 switch (cmd) {
3162 case GETPID:
3163 case GETNCNT:
3164 case GETZCNT:
3165 case GETVAL:
3166 case GETALL:
3167 case IPC_STAT:
3168 case SEM_STAT:
3169 may = MAY_READ;
3170 break;
3171 case SETVAL:
3172 case SETALL:
3173 case IPC_RMID:
3174 case IPC_SET:
3175 may = MAY_READWRITE;
3176 break;
3177 case IPC_INFO:
3178 case SEM_INFO:
3179 /*
3180 * System level information
3181 */
3182 return 0;
3183 default:
3184 return -EINVAL;
3185 }
3186
Etienne Bassetecfcc532009-04-08 20:40:06 +02003187 return smk_curacc_sem(sma, may);
Casey Schauflere114e472008-02-04 22:29:50 -08003188}
3189
3190/**
3191 * smack_sem_semop - Smack checks of semaphore operations
3192 * @sma: the object
3193 * @sops: unused
3194 * @nsops: unused
3195 * @alter: unused
3196 *
3197 * Treated as read and write in all cases.
3198 *
3199 * Returns 0 if access is allowed, error code otherwise
3200 */
3201static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops,
3202 unsigned nsops, int alter)
3203{
Etienne Bassetecfcc532009-04-08 20:40:06 +02003204 return smk_curacc_sem(sma, MAY_READWRITE);
Casey Schauflere114e472008-02-04 22:29:50 -08003205}
3206
3207/**
3208 * smack_msg_alloc_security - Set the security blob for msg
3209 * @msq: the object
3210 *
3211 * Returns 0
3212 */
3213static int smack_msg_queue_alloc_security(struct msg_queue *msq)
3214{
3215 struct kern_ipc_perm *kisp = &msq->q_perm;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003216 struct smack_known *skp = smk_of_current();
Casey Schauflere114e472008-02-04 22:29:50 -08003217
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02003218 kisp->security = skp;
Casey Schauflere114e472008-02-04 22:29:50 -08003219 return 0;
3220}
3221
3222/**
3223 * smack_msg_free_security - Clear the security blob for msg
3224 * @msq: the object
3225 *
3226 * Clears the blob pointer
3227 */
3228static void smack_msg_queue_free_security(struct msg_queue *msq)
3229{
3230 struct kern_ipc_perm *kisp = &msq->q_perm;
3231
3232 kisp->security = NULL;
3233}
3234
3235/**
3236 * smack_of_msq - the smack pointer for the msq
3237 * @msq: the object
3238 *
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02003239 * Returns a pointer to the smack label entry
Casey Schauflere114e472008-02-04 22:29:50 -08003240 */
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02003241static struct smack_known *smack_of_msq(struct msg_queue *msq)
Casey Schauflere114e472008-02-04 22:29:50 -08003242{
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02003243 return (struct smack_known *)msq->q_perm.security;
Casey Schauflere114e472008-02-04 22:29:50 -08003244}
3245
3246/**
Etienne Bassetecfcc532009-04-08 20:40:06 +02003247 * smk_curacc_msq : helper to check if current has access on msq
3248 * @msq : the msq
3249 * @access : access requested
3250 *
3251 * return 0 if current has access, error otherwise
3252 */
3253static int smk_curacc_msq(struct msg_queue *msq, int access)
3254{
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02003255 struct smack_known *msp = smack_of_msq(msq);
Etienne Bassetecfcc532009-04-08 20:40:06 +02003256 struct smk_audit_info ad;
Casey Schauflerd166c802014-08-27 14:51:27 -07003257 int rc;
Etienne Bassetecfcc532009-04-08 20:40:06 +02003258
3259#ifdef CONFIG_AUDIT
3260 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3261 ad.a.u.ipc_id = msq->q_perm.id;
3262#endif
Casey Schauflerd166c802014-08-27 14:51:27 -07003263 rc = smk_curacc(msp, access, &ad);
3264 rc = smk_bu_current("msq", msp, access, rc);
3265 return rc;
Etienne Bassetecfcc532009-04-08 20:40:06 +02003266}
3267
3268/**
Casey Schauflere114e472008-02-04 22:29:50 -08003269 * smack_msg_queue_associate - Smack access check for msg_queue
3270 * @msq: the object
3271 * @msqflg: access requested
3272 *
3273 * Returns 0 if current has the requested access, error code otherwise
3274 */
3275static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg)
3276{
Casey Schauflere114e472008-02-04 22:29:50 -08003277 int may;
3278
3279 may = smack_flags_to_may(msqflg);
Etienne Bassetecfcc532009-04-08 20:40:06 +02003280 return smk_curacc_msq(msq, may);
Casey Schauflere114e472008-02-04 22:29:50 -08003281}
3282
3283/**
3284 * smack_msg_queue_msgctl - Smack access check for msg_queue
3285 * @msq: the object
3286 * @cmd: what it wants to do
3287 *
3288 * Returns 0 if current has the requested access, error code otherwise
3289 */
3290static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd)
3291{
Casey Schauflere114e472008-02-04 22:29:50 -08003292 int may;
3293
3294 switch (cmd) {
3295 case IPC_STAT:
3296 case MSG_STAT:
3297 may = MAY_READ;
3298 break;
3299 case IPC_SET:
3300 case IPC_RMID:
3301 may = MAY_READWRITE;
3302 break;
3303 case IPC_INFO:
3304 case MSG_INFO:
3305 /*
3306 * System level information
3307 */
3308 return 0;
3309 default:
3310 return -EINVAL;
3311 }
3312
Etienne Bassetecfcc532009-04-08 20:40:06 +02003313 return smk_curacc_msq(msq, may);
Casey Schauflere114e472008-02-04 22:29:50 -08003314}
3315
3316/**
3317 * smack_msg_queue_msgsnd - Smack access check for msg_queue
3318 * @msq: the object
3319 * @msg: unused
3320 * @msqflg: access requested
3321 *
3322 * Returns 0 if current has the requested access, error code otherwise
3323 */
3324static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg,
3325 int msqflg)
3326{
Etienne Bassetecfcc532009-04-08 20:40:06 +02003327 int may;
Casey Schauflere114e472008-02-04 22:29:50 -08003328
Etienne Bassetecfcc532009-04-08 20:40:06 +02003329 may = smack_flags_to_may(msqflg);
3330 return smk_curacc_msq(msq, may);
Casey Schauflere114e472008-02-04 22:29:50 -08003331}
3332
3333/**
3334 * smack_msg_queue_msgsnd - Smack access check for msg_queue
3335 * @msq: the object
3336 * @msg: unused
3337 * @target: unused
3338 * @type: unused
3339 * @mode: unused
3340 *
3341 * Returns 0 if current has read and write access, error code otherwise
3342 */
3343static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
3344 struct task_struct *target, long type, int mode)
3345{
Etienne Bassetecfcc532009-04-08 20:40:06 +02003346 return smk_curacc_msq(msq, MAY_READWRITE);
Casey Schauflere114e472008-02-04 22:29:50 -08003347}
3348
3349/**
3350 * smack_ipc_permission - Smack access for ipc_permission()
3351 * @ipp: the object permissions
3352 * @flag: access requested
3353 *
3354 * Returns 0 if current has read and write access, error code otherwise
3355 */
3356static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
3357{
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02003358 struct smack_known *iskp = ipp->security;
Etienne Bassetecfcc532009-04-08 20:40:06 +02003359 int may = smack_flags_to_may(flag);
3360 struct smk_audit_info ad;
Casey Schauflerd166c802014-08-27 14:51:27 -07003361 int rc;
Casey Schauflere114e472008-02-04 22:29:50 -08003362
Etienne Bassetecfcc532009-04-08 20:40:06 +02003363#ifdef CONFIG_AUDIT
3364 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3365 ad.a.u.ipc_id = ipp->id;
3366#endif
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02003367 rc = smk_curacc(iskp, may, &ad);
3368 rc = smk_bu_current("svipc", iskp, may, rc);
Casey Schauflerd166c802014-08-27 14:51:27 -07003369 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -08003370}
3371
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10003372/**
3373 * smack_ipc_getsecid - Extract smack security id
Randy Dunlap251a2a92009-02-18 11:42:33 -08003374 * @ipp: the object permissions
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10003375 * @secid: where result will be saved
3376 */
3377static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid)
3378{
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02003379 struct smack_known *iskp = ipp->security;
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10003380
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02003381 *secid = iskp->smk_secid;
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10003382}
3383
Casey Schauflere114e472008-02-04 22:29:50 -08003384/**
3385 * smack_d_instantiate - Make sure the blob is correct on an inode
Dan Carpenter3e62cbb2010-06-01 09:14:04 +02003386 * @opt_dentry: dentry where inode will be attached
Casey Schauflere114e472008-02-04 22:29:50 -08003387 * @inode: the object
3388 *
3389 * Set the inode's security blob if it hasn't been done already.
3390 */
3391static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
3392{
3393 struct super_block *sbp;
3394 struct superblock_smack *sbsp;
3395 struct inode_smack *isp;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003396 struct smack_known *skp;
3397 struct smack_known *ckp = smk_of_current();
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02003398 struct smack_known *final;
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +02003399 char trattr[TRANS_TRUE_SIZE];
3400 int transflag = 0;
Casey Schaufler2267b132012-03-13 19:14:19 -07003401 int rc;
Casey Schauflere114e472008-02-04 22:29:50 -08003402 struct dentry *dp;
3403
3404 if (inode == NULL)
3405 return;
3406
3407 isp = inode->i_security;
3408
3409 mutex_lock(&isp->smk_lock);
3410 /*
3411 * If the inode is already instantiated
3412 * take the quick way out
3413 */
3414 if (isp->smk_flags & SMK_INODE_INSTANT)
3415 goto unlockandout;
3416
3417 sbp = inode->i_sb;
3418 sbsp = sbp->s_security;
3419 /*
3420 * We're going to use the superblock default label
3421 * if there's no label on the file.
3422 */
3423 final = sbsp->smk_default;
3424
3425 /*
Casey Schauflere97dcb02008-06-02 10:04:32 -07003426 * If this is the root inode the superblock
3427 * may be in the process of initialization.
3428 * If that is the case use the root value out
3429 * of the superblock.
3430 */
3431 if (opt_dentry->d_parent == opt_dentry) {
Łukasz Stelmach1d8c2322014-12-16 16:53:08 +01003432 switch (sbp->s_magic) {
3433 case CGROUP_SUPER_MAGIC:
Casey Schaufler36ea7352014-04-28 15:23:01 -07003434 /*
3435 * The cgroup filesystem is never mounted,
3436 * so there's no opportunity to set the mount
3437 * options.
3438 */
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02003439 sbsp->smk_root = &smack_known_star;
3440 sbsp->smk_default = &smack_known_star;
Łukasz Stelmach1d8c2322014-12-16 16:53:08 +01003441 isp->smk_inode = sbsp->smk_root;
3442 break;
3443 case TMPFS_MAGIC:
3444 /*
3445 * What about shmem/tmpfs anonymous files with dentry
3446 * obtained from d_alloc_pseudo()?
3447 */
3448 isp->smk_inode = smk_of_current();
3449 break;
Roman Kubiak8da4aba2015-10-05 12:27:16 +02003450 case PIPEFS_MAGIC:
3451 isp->smk_inode = smk_of_current();
3452 break;
Rafal Krypa805b65a2016-12-09 14:03:04 +01003453 case SOCKFS_MAGIC:
3454 /*
3455 * Socket access is controlled by the socket
3456 * structures associated with the task involved.
3457 */
3458 isp->smk_inode = &smack_known_star;
3459 break;
Łukasz Stelmach1d8c2322014-12-16 16:53:08 +01003460 default:
3461 isp->smk_inode = sbsp->smk_root;
3462 break;
Casey Schaufler36ea7352014-04-28 15:23:01 -07003463 }
Casey Schauflere97dcb02008-06-02 10:04:32 -07003464 isp->smk_flags |= SMK_INODE_INSTANT;
3465 goto unlockandout;
3466 }
3467
3468 /*
Casey Schauflere114e472008-02-04 22:29:50 -08003469 * This is pretty hackish.
3470 * Casey says that we shouldn't have to do
3471 * file system specific code, but it does help
3472 * with keeping it simple.
3473 */
3474 switch (sbp->s_magic) {
3475 case SMACK_MAGIC:
Casey Schaufler36ea7352014-04-28 15:23:01 -07003476 case CGROUP_SUPER_MAGIC:
Casey Schauflere114e472008-02-04 22:29:50 -08003477 /*
Lucas De Marchi25985ed2011-03-30 22:57:33 -03003478 * Casey says that it's a little embarrassing
Casey Schauflere114e472008-02-04 22:29:50 -08003479 * that the smack file system doesn't do
3480 * extended attributes.
Casey Schaufler36ea7352014-04-28 15:23:01 -07003481 *
Casey Schaufler36ea7352014-04-28 15:23:01 -07003482 * Cgroupfs is special
Casey Schauflere114e472008-02-04 22:29:50 -08003483 */
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02003484 final = &smack_known_star;
Casey Schauflere114e472008-02-04 22:29:50 -08003485 break;
3486 case DEVPTS_SUPER_MAGIC:
3487 /*
3488 * devpts seems content with the label of the task.
3489 * Programs that change smack have to treat the
3490 * pty with respect.
3491 */
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02003492 final = ckp;
Casey Schauflere114e472008-02-04 22:29:50 -08003493 break;
Casey Schauflere114e472008-02-04 22:29:50 -08003494 case PROC_SUPER_MAGIC:
3495 /*
3496 * Casey says procfs appears not to care.
3497 * The superblock default suffices.
3498 */
3499 break;
3500 case TMPFS_MAGIC:
3501 /*
3502 * Device labels should come from the filesystem,
3503 * but watch out, because they're volitile,
3504 * getting recreated on every reboot.
3505 */
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02003506 final = &smack_known_star;
Casey Schauflere114e472008-02-04 22:29:50 -08003507 /*
3508 * No break.
3509 *
3510 * If a smack value has been set we want to use it,
3511 * but since tmpfs isn't giving us the opportunity
3512 * to set mount options simulate setting the
3513 * superblock default.
3514 */
3515 default:
3516 /*
3517 * This isn't an understood special case.
3518 * Get the value from the xattr.
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08003519 */
3520
3521 /*
3522 * UNIX domain sockets use lower level socket data.
3523 */
3524 if (S_ISSOCK(inode->i_mode)) {
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02003525 final = &smack_known_star;
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08003526 break;
3527 }
3528 /*
Casey Schauflere114e472008-02-04 22:29:50 -08003529 * No xattr support means, alas, no SMACK label.
3530 * Use the aforeapplied default.
3531 * It would be curious if the label of the task
3532 * does not match that assigned.
3533 */
Andreas Gruenbacher5d6c3192016-09-29 17:48:42 +02003534 if (!(inode->i_opflags & IOP_XATTR))
3535 break;
Casey Schauflere114e472008-02-04 22:29:50 -08003536 /*
3537 * Get the dentry for xattr.
3538 */
Dan Carpenter3e62cbb2010-06-01 09:14:04 +02003539 dp = dget(opt_dentry);
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003540 skp = smk_fetch(XATTR_NAME_SMACK, inode, dp);
Lukasz Pawelczyke774ad62015-04-20 17:12:54 +02003541 if (!IS_ERR_OR_NULL(skp))
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02003542 final = skp;
Casey Schaufler2267b132012-03-13 19:14:19 -07003543
3544 /*
3545 * Transmuting directory
3546 */
3547 if (S_ISDIR(inode->i_mode)) {
3548 /*
3549 * If this is a new directory and the label was
3550 * transmuted when the inode was initialized
3551 * set the transmute attribute on the directory
3552 * and mark the inode.
3553 *
3554 * If there is a transmute attribute on the
3555 * directory mark the inode.
3556 */
3557 if (isp->smk_flags & SMK_INODE_CHANGED) {
3558 isp->smk_flags &= ~SMK_INODE_CHANGED;
Andreas Gruenbacher5d6c3192016-09-29 17:48:42 +02003559 rc = __vfs_setxattr(dp, inode,
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +02003560 XATTR_NAME_SMACKTRANSMUTE,
Casey Schaufler2267b132012-03-13 19:14:19 -07003561 TRANS_TRUE, TRANS_TRUE_SIZE,
3562 0);
3563 } else {
Andreas Gruenbacher5d6c3192016-09-29 17:48:42 +02003564 rc = __vfs_getxattr(dp, inode,
Casey Schaufler2267b132012-03-13 19:14:19 -07003565 XATTR_NAME_SMACKTRANSMUTE, trattr,
3566 TRANS_TRUE_SIZE);
3567 if (rc >= 0 && strncmp(trattr, TRANS_TRUE,
3568 TRANS_TRUE_SIZE) != 0)
3569 rc = -EINVAL;
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +02003570 }
Casey Schaufler2267b132012-03-13 19:14:19 -07003571 if (rc >= 0)
3572 transflag = SMK_INODE_TRANSMUTE;
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +02003573 }
Seth Forshee809c02e2016-04-26 14:36:22 -05003574 /*
3575 * Don't let the exec or mmap label be "*" or "@".
3576 */
3577 skp = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp);
3578 if (IS_ERR(skp) || skp == &smack_known_star ||
3579 skp == &smack_known_web)
3580 skp = NULL;
3581 isp->smk_task = skp;
Lukasz Pawelczyke774ad62015-04-20 17:12:54 +02003582
Casey Schaufler19760ad2013-12-16 16:27:26 -08003583 skp = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp);
Lukasz Pawelczyke774ad62015-04-20 17:12:54 +02003584 if (IS_ERR(skp) || skp == &smack_known_star ||
3585 skp == &smack_known_web)
Casey Schaufler19760ad2013-12-16 16:27:26 -08003586 skp = NULL;
3587 isp->smk_mmap = skp;
Casey Schaufler676dac42010-12-02 06:43:39 -08003588
Casey Schauflere114e472008-02-04 22:29:50 -08003589 dput(dp);
3590 break;
3591 }
3592
3593 if (final == NULL)
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02003594 isp->smk_inode = ckp;
Casey Schauflere114e472008-02-04 22:29:50 -08003595 else
3596 isp->smk_inode = final;
3597
Jarkko Sakkinen5c6d1122010-12-07 13:34:01 +02003598 isp->smk_flags |= (SMK_INODE_INSTANT | transflag);
Casey Schauflere114e472008-02-04 22:29:50 -08003599
3600unlockandout:
3601 mutex_unlock(&isp->smk_lock);
3602 return;
3603}
3604
3605/**
3606 * smack_getprocattr - Smack process attribute access
3607 * @p: the object task
3608 * @name: the name of the attribute in /proc/.../attr
3609 * @value: where to put the result
3610 *
3611 * Places a copy of the task Smack into value
3612 *
3613 * Returns the length of the smack label or an error code
3614 */
3615static int smack_getprocattr(struct task_struct *p, char *name, char **value)
3616{
Andrey Ryabinin6d1cff22015-01-13 18:52:40 +03003617 struct smack_known *skp = smk_of_task_struct(p);
Casey Schauflere114e472008-02-04 22:29:50 -08003618 char *cp;
3619 int slen;
3620
3621 if (strcmp(name, "current") != 0)
3622 return -EINVAL;
3623
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003624 cp = kstrdup(skp->smk_known, GFP_KERNEL);
Casey Schauflere114e472008-02-04 22:29:50 -08003625 if (cp == NULL)
3626 return -ENOMEM;
3627
3628 slen = strlen(cp);
3629 *value = cp;
3630 return slen;
3631}
3632
3633/**
3634 * smack_setprocattr - Smack process attribute setting
Casey Schauflere114e472008-02-04 22:29:50 -08003635 * @name: the name of the attribute in /proc/.../attr
3636 * @value: the value to set
3637 * @size: the size of the value
3638 *
3639 * Sets the Smack value of the task. Only setting self
3640 * is permitted and only with privilege
3641 *
3642 * Returns the length of the smack label or an error code
3643 */
Stephen Smalleyb21507e2017-01-09 10:07:31 -05003644static int smack_setprocattr(const char *name, void *value, size_t size)
Casey Schauflere114e472008-02-04 22:29:50 -08003645{
Zbigniew Jasinski38416e52015-10-19 18:23:53 +02003646 struct task_smack *tsp = current_security();
David Howellsd84f4f92008-11-14 10:39:23 +11003647 struct cred *new;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003648 struct smack_known *skp;
Zbigniew Jasinski38416e52015-10-19 18:23:53 +02003649 struct smack_known_list_elem *sklep;
3650 int rc;
Casey Schauflere114e472008-02-04 22:29:50 -08003651
Zbigniew Jasinski38416e52015-10-19 18:23:53 +02003652 if (!smack_privileged(CAP_MAC_ADMIN) && list_empty(&tsp->smk_relabel))
David Howells5cd9c582008-08-14 11:37:28 +01003653 return -EPERM;
3654
Casey Schauflerf7112e62012-05-06 15:22:02 -07003655 if (value == NULL || size == 0 || size >= SMK_LONGLABEL)
Casey Schauflere114e472008-02-04 22:29:50 -08003656 return -EINVAL;
3657
3658 if (strcmp(name, "current") != 0)
3659 return -EINVAL;
3660
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003661 skp = smk_import_entry(value, size);
Lukasz Pawelczyke774ad62015-04-20 17:12:54 +02003662 if (IS_ERR(skp))
3663 return PTR_ERR(skp);
Casey Schauflere114e472008-02-04 22:29:50 -08003664
Casey Schaufler6d3dc072008-12-31 12:54:12 -05003665 /*
Himanshu Shukla7128ea12016-11-10 16:17:49 +05303666 * No process is ever allowed the web ("@") label
3667 * and the star ("*") label.
Casey Schaufler6d3dc072008-12-31 12:54:12 -05003668 */
Himanshu Shukla7128ea12016-11-10 16:17:49 +05303669 if (skp == &smack_known_web || skp == &smack_known_star)
3670 return -EINVAL;
Casey Schaufler6d3dc072008-12-31 12:54:12 -05003671
Zbigniew Jasinski38416e52015-10-19 18:23:53 +02003672 if (!smack_privileged(CAP_MAC_ADMIN)) {
3673 rc = -EPERM;
3674 list_for_each_entry(sklep, &tsp->smk_relabel, list)
3675 if (sklep->smk_label == skp) {
3676 rc = 0;
3677 break;
3678 }
3679 if (rc)
3680 return rc;
3681 }
3682
David Howellsd84f4f92008-11-14 10:39:23 +11003683 new = prepare_creds();
Casey Schaufler6d3dc072008-12-31 12:54:12 -05003684 if (new == NULL)
David Howellsd84f4f92008-11-14 10:39:23 +11003685 return -ENOMEM;
Casey Schaufler7898e1f2011-01-17 08:05:27 -08003686
Casey Schaufler46a2f3b2012-08-22 11:44:03 -07003687 tsp = new->security;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003688 tsp->smk_task = skp;
Zbigniew Jasinski38416e52015-10-19 18:23:53 +02003689 /*
3690 * process can change its label only once
3691 */
3692 smk_destroy_label_list(&tsp->smk_relabel);
Casey Schaufler7898e1f2011-01-17 08:05:27 -08003693
David Howellsd84f4f92008-11-14 10:39:23 +11003694 commit_creds(new);
Casey Schauflere114e472008-02-04 22:29:50 -08003695 return size;
3696}
3697
3698/**
3699 * smack_unix_stream_connect - Smack access on UDS
David S. Miller3610cda2011-01-05 15:38:53 -08003700 * @sock: one sock
3701 * @other: the other sock
Casey Schauflere114e472008-02-04 22:29:50 -08003702 * @newsk: unused
3703 *
3704 * Return 0 if a subject with the smack of sock could access
3705 * an object with the smack of other, otherwise an error code
3706 */
David S. Miller3610cda2011-01-05 15:38:53 -08003707static int smack_unix_stream_connect(struct sock *sock,
3708 struct sock *other, struct sock *newsk)
Casey Schauflere114e472008-02-04 22:29:50 -08003709{
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003710 struct smack_known *skp;
Casey Schaufler54e70ec2014-04-10 16:37:08 -07003711 struct smack_known *okp;
James Morrisd2e7ad12011-01-10 09:46:24 +11003712 struct socket_smack *ssp = sock->sk_security;
3713 struct socket_smack *osp = other->sk_security;
Casey Schaufler975d5e52011-09-26 14:43:39 -07003714 struct socket_smack *nsp = newsk->sk_security;
Etienne Bassetecfcc532009-04-08 20:40:06 +02003715 struct smk_audit_info ad;
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08003716 int rc = 0;
Kees Cook923e9a12012-04-10 13:26:44 -07003717#ifdef CONFIG_AUDIT
3718 struct lsm_network_audit net;
Kees Cook923e9a12012-04-10 13:26:44 -07003719#endif
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08003720
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003721 if (!smack_privileged(CAP_MAC_OVERRIDE)) {
3722 skp = ssp->smk_out;
Zbigniew Jasinski96be7b52014-12-29 15:34:58 +01003723 okp = osp->smk_in;
Casey Schaufler54e70ec2014-04-10 16:37:08 -07003724#ifdef CONFIG_AUDIT
3725 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3726 smk_ad_setfield_u_net_sk(&ad, other);
3727#endif
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02003728 rc = smk_access(skp, okp, MAY_WRITE, &ad);
3729 rc = smk_bu_note("UDS connect", skp, okp, MAY_WRITE, rc);
Casey Schauflerd166c802014-08-27 14:51:27 -07003730 if (rc == 0) {
Zbigniew Jasinski96be7b52014-12-29 15:34:58 +01003731 okp = osp->smk_out;
3732 skp = ssp->smk_in;
Rafal Krypa138a8682015-01-08 18:52:45 +01003733 rc = smk_access(okp, skp, MAY_WRITE, &ad);
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02003734 rc = smk_bu_note("UDS connect", okp, skp,
Casey Schauflerd166c802014-08-27 14:51:27 -07003735 MAY_WRITE, rc);
3736 }
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003737 }
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08003738
Casey Schaufler975d5e52011-09-26 14:43:39 -07003739 /*
3740 * Cross reference the peer labels for SO_PEERSEC.
3741 */
3742 if (rc == 0) {
Casey Schaufler54e70ec2014-04-10 16:37:08 -07003743 nsp->smk_packet = ssp->smk_out;
3744 ssp->smk_packet = osp->smk_out;
Casey Schaufler975d5e52011-09-26 14:43:39 -07003745 }
3746
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08003747 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -08003748}
3749
3750/**
3751 * smack_unix_may_send - Smack access on UDS
3752 * @sock: one socket
3753 * @other: the other socket
3754 *
3755 * Return 0 if a subject with the smack of sock could access
3756 * an object with the smack of other, otherwise an error code
3757 */
3758static int smack_unix_may_send(struct socket *sock, struct socket *other)
3759{
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08003760 struct socket_smack *ssp = sock->sk->sk_security;
3761 struct socket_smack *osp = other->sk->sk_security;
Etienne Bassetecfcc532009-04-08 20:40:06 +02003762 struct smk_audit_info ad;
Casey Schauflerd166c802014-08-27 14:51:27 -07003763 int rc;
Casey Schauflere114e472008-02-04 22:29:50 -08003764
Kees Cook923e9a12012-04-10 13:26:44 -07003765#ifdef CONFIG_AUDIT
3766 struct lsm_network_audit net;
3767
Eric Paris48c62af2012-04-02 13:15:44 -04003768 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
Etienne Bassetecfcc532009-04-08 20:40:06 +02003769 smk_ad_setfield_u_net_sk(&ad, other->sk);
Kees Cook923e9a12012-04-10 13:26:44 -07003770#endif
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08003771
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003772 if (smack_privileged(CAP_MAC_OVERRIDE))
3773 return 0;
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08003774
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02003775 rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad);
3776 rc = smk_bu_note("UDS send", ssp->smk_out, osp->smk_in, MAY_WRITE, rc);
Casey Schauflerd166c802014-08-27 14:51:27 -07003777 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -08003778}
3779
3780/**
Casey Schaufler6d3dc072008-12-31 12:54:12 -05003781 * smack_socket_sendmsg - Smack check based on destination host
3782 * @sock: the socket
Randy Dunlap251a2a92009-02-18 11:42:33 -08003783 * @msg: the message
Casey Schaufler6d3dc072008-12-31 12:54:12 -05003784 * @size: the size of the message
3785 *
Casey Schauflerc6739442013-05-22 18:42:56 -07003786 * Return 0 if the current subject can write to the destination host.
3787 * For IPv4 this is only a question if the destination is a single label host.
3788 * For IPv6 this is a check against the label of the port.
Casey Schaufler6d3dc072008-12-31 12:54:12 -05003789 */
3790static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
3791 int size)
3792{
3793 struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name;
Casey Schaufler21abb1e2015-07-22 14:25:31 -07003794#if IS_ENABLED(CONFIG_IPV6)
Casey Schaufler6ea06242013-08-05 13:21:22 -07003795 struct sockaddr_in6 *sap = (struct sockaddr_in6 *) msg->msg_name;
Casey Schaufler21abb1e2015-07-22 14:25:31 -07003796#endif
3797#ifdef SMACK_IPV6_SECMARK_LABELING
3798 struct socket_smack *ssp = sock->sk->sk_security;
3799 struct smack_known *rsp;
3800#endif
Casey Schauflerc6739442013-05-22 18:42:56 -07003801 int rc = 0;
Casey Schaufler6d3dc072008-12-31 12:54:12 -05003802
3803 /*
3804 * Perfectly reasonable for this to be NULL
3805 */
Casey Schauflerc6739442013-05-22 18:42:56 -07003806 if (sip == NULL)
Casey Schaufler6d3dc072008-12-31 12:54:12 -05003807 return 0;
3808
Roman Kubiak81bd0d52015-12-17 13:24:35 +01003809 switch (sock->sk->sk_family) {
Casey Schauflerc6739442013-05-22 18:42:56 -07003810 case AF_INET:
3811 rc = smack_netlabel_send(sock->sk, sip);
3812 break;
3813 case AF_INET6:
Casey Schaufler21abb1e2015-07-22 14:25:31 -07003814#ifdef SMACK_IPV6_SECMARK_LABELING
3815 rsp = smack_ipv6host_label(sap);
3816 if (rsp != NULL)
3817 rc = smk_ipv6_check(ssp->smk_out, rsp, sap,
3818 SMK_CONNECTING);
3819#endif
3820#ifdef SMACK_IPV6_PORT_LABELING
Casey Schauflerc6739442013-05-22 18:42:56 -07003821 rc = smk_ipv6_port_check(sock->sk, sap, SMK_SENDING);
Casey Schaufler21abb1e2015-07-22 14:25:31 -07003822#endif
Casey Schauflerc6739442013-05-22 18:42:56 -07003823 break;
3824 }
3825 return rc;
Casey Schaufler6d3dc072008-12-31 12:54:12 -05003826}
3827
Casey Schaufler6d3dc072008-12-31 12:54:12 -05003828/**
Randy Dunlap251a2a92009-02-18 11:42:33 -08003829 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
Casey Schauflere114e472008-02-04 22:29:50 -08003830 * @sap: netlabel secattr
Casey Schaufler272cd7a2011-09-20 12:24:36 -07003831 * @ssp: socket security information
Casey Schauflere114e472008-02-04 22:29:50 -08003832 *
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003833 * Returns a pointer to a Smack label entry found on the label list.
Casey Schauflere114e472008-02-04 22:29:50 -08003834 */
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003835static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap,
3836 struct socket_smack *ssp)
Casey Schauflere114e472008-02-04 22:29:50 -08003837{
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003838 struct smack_known *skp;
Casey Schauflerf7112e62012-05-06 15:22:02 -07003839 int found = 0;
Casey Schaufler677264e2013-06-28 13:47:07 -07003840 int acat;
3841 int kcat;
Casey Schauflere114e472008-02-04 22:29:50 -08003842
Casey Schaufler6d3dc072008-12-31 12:54:12 -05003843 if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) {
Casey Schauflere114e472008-02-04 22:29:50 -08003844 /*
Casey Schaufler6d3dc072008-12-31 12:54:12 -05003845 * Looks like a CIPSO packet.
Casey Schauflere114e472008-02-04 22:29:50 -08003846 * If there are flags but no level netlabel isn't
3847 * behaving the way we expect it to.
3848 *
Casey Schauflerf7112e62012-05-06 15:22:02 -07003849 * Look it up in the label table
Casey Schauflere114e472008-02-04 22:29:50 -08003850 * Without guidance regarding the smack value
3851 * for the packet fall back on the network
3852 * ambient value.
3853 */
Casey Schauflerf7112e62012-05-06 15:22:02 -07003854 rcu_read_lock();
Vishal Goel348dc282016-11-23 10:45:31 +05303855 list_for_each_entry_rcu(skp, &smack_known_list, list) {
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003856 if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl)
Casey Schauflerf7112e62012-05-06 15:22:02 -07003857 continue;
Casey Schaufler677264e2013-06-28 13:47:07 -07003858 /*
3859 * Compare the catsets. Use the netlbl APIs.
3860 */
3861 if ((sap->flags & NETLBL_SECATTR_MLS_CAT) == 0) {
3862 if ((skp->smk_netlabel.flags &
3863 NETLBL_SECATTR_MLS_CAT) == 0)
3864 found = 1;
3865 break;
3866 }
3867 for (acat = -1, kcat = -1; acat == kcat; ) {
Paul Moore4fbe63d2014-08-01 11:17:37 -04003868 acat = netlbl_catmap_walk(sap->attr.mls.cat,
3869 acat + 1);
3870 kcat = netlbl_catmap_walk(
Casey Schaufler677264e2013-06-28 13:47:07 -07003871 skp->smk_netlabel.attr.mls.cat,
3872 kcat + 1);
3873 if (acat < 0 || kcat < 0)
3874 break;
3875 }
3876 if (acat == kcat) {
3877 found = 1;
3878 break;
3879 }
Casey Schauflere114e472008-02-04 22:29:50 -08003880 }
Casey Schauflerf7112e62012-05-06 15:22:02 -07003881 rcu_read_unlock();
3882
3883 if (found)
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003884 return skp;
Casey Schauflerf7112e62012-05-06 15:22:02 -07003885
Casey Schaufler54e70ec2014-04-10 16:37:08 -07003886 if (ssp != NULL && ssp->smk_in == &smack_known_star)
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003887 return &smack_known_web;
3888 return &smack_known_star;
Casey Schaufler6d3dc072008-12-31 12:54:12 -05003889 }
Casey Schaufler152f91d2016-11-14 09:38:15 -08003890 if ((sap->flags & NETLBL_SECATTR_SECID) != 0)
Casey Schaufler6d3dc072008-12-31 12:54:12 -05003891 /*
3892 * Looks like a fallback, which gives us a secid.
3893 */
Casey Schaufler152f91d2016-11-14 09:38:15 -08003894 return smack_from_secid(sap->attr.secid);
Casey Schauflere114e472008-02-04 22:29:50 -08003895 /*
Casey Schaufler6d3dc072008-12-31 12:54:12 -05003896 * Without guidance regarding the smack value
3897 * for the packet fall back on the network
3898 * ambient value.
Casey Schauflere114e472008-02-04 22:29:50 -08003899 */
Casey Schaufler272cd7a2011-09-20 12:24:36 -07003900 return smack_net_ambient;
Casey Schauflere114e472008-02-04 22:29:50 -08003901}
3902
Casey Schaufler69f287a2014-12-12 17:08:40 -08003903#if IS_ENABLED(CONFIG_IPV6)
Casey Schaufler6ea06242013-08-05 13:21:22 -07003904static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr_in6 *sip)
Casey Schauflerc6739442013-05-22 18:42:56 -07003905{
Casey Schauflerc6739442013-05-22 18:42:56 -07003906 u8 nexthdr;
3907 int offset;
3908 int proto = -EINVAL;
3909 struct ipv6hdr _ipv6h;
3910 struct ipv6hdr *ip6;
3911 __be16 frag_off;
3912 struct tcphdr _tcph, *th;
3913 struct udphdr _udph, *uh;
3914 struct dccp_hdr _dccph, *dh;
3915
3916 sip->sin6_port = 0;
3917
3918 offset = skb_network_offset(skb);
3919 ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h);
3920 if (ip6 == NULL)
3921 return -EINVAL;
3922 sip->sin6_addr = ip6->saddr;
3923
3924 nexthdr = ip6->nexthdr;
3925 offset += sizeof(_ipv6h);
3926 offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
3927 if (offset < 0)
3928 return -EINVAL;
3929
3930 proto = nexthdr;
3931 switch (proto) {
3932 case IPPROTO_TCP:
3933 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
3934 if (th != NULL)
3935 sip->sin6_port = th->source;
3936 break;
3937 case IPPROTO_UDP:
3938 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
3939 if (uh != NULL)
3940 sip->sin6_port = uh->source;
3941 break;
3942 case IPPROTO_DCCP:
3943 dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
3944 if (dh != NULL)
3945 sip->sin6_port = dh->dccph_sport;
3946 break;
3947 }
3948 return proto;
3949}
Casey Schaufler69f287a2014-12-12 17:08:40 -08003950#endif /* CONFIG_IPV6 */
Casey Schauflerc6739442013-05-22 18:42:56 -07003951
Casey Schauflere114e472008-02-04 22:29:50 -08003952/**
3953 * smack_socket_sock_rcv_skb - Smack packet delivery access check
3954 * @sk: socket
3955 * @skb: packet
3956 *
3957 * Returns 0 if the packet should be delivered, an error code otherwise
3958 */
3959static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
3960{
3961 struct netlbl_lsm_secattr secattr;
3962 struct socket_smack *ssp = sk->sk_security;
Casey Schaufler69f287a2014-12-12 17:08:40 -08003963 struct smack_known *skp = NULL;
Casey Schauflerc6739442013-05-22 18:42:56 -07003964 int rc = 0;
Etienne Bassetecfcc532009-04-08 20:40:06 +02003965 struct smk_audit_info ad;
Kees Cook923e9a12012-04-10 13:26:44 -07003966#ifdef CONFIG_AUDIT
Eric Paris48c62af2012-04-02 13:15:44 -04003967 struct lsm_network_audit net;
Kees Cook923e9a12012-04-10 13:26:44 -07003968#endif
Casey Schaufler69f287a2014-12-12 17:08:40 -08003969#if IS_ENABLED(CONFIG_IPV6)
3970 struct sockaddr_in6 sadd;
3971 int proto;
3972#endif /* CONFIG_IPV6 */
3973
Casey Schauflerc6739442013-05-22 18:42:56 -07003974 switch (sk->sk_family) {
3975 case PF_INET:
Casey Schaufler69f287a2014-12-12 17:08:40 -08003976#ifdef CONFIG_SECURITY_SMACK_NETFILTER
3977 /*
3978 * If there is a secmark use it rather than the CIPSO label.
3979 * If there is no secmark fall back to CIPSO.
3980 * The secmark is assumed to reflect policy better.
3981 */
3982 if (skb && skb->secmark != 0) {
3983 skp = smack_from_secid(skb->secmark);
3984 goto access_check;
3985 }
3986#endif /* CONFIG_SECURITY_SMACK_NETFILTER */
Casey Schauflerc6739442013-05-22 18:42:56 -07003987 /*
3988 * Translate what netlabel gave us.
3989 */
3990 netlbl_secattr_init(&secattr);
Casey Schauflere114e472008-02-04 22:29:50 -08003991
Casey Schauflerc6739442013-05-22 18:42:56 -07003992 rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr);
3993 if (rc == 0)
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003994 skp = smack_from_secattr(&secattr, ssp);
Casey Schauflerc6739442013-05-22 18:42:56 -07003995 else
Casey Schaufler2f823ff2013-05-22 18:43:03 -07003996 skp = smack_net_ambient;
Casey Schaufler6d3dc072008-12-31 12:54:12 -05003997
Casey Schauflerc6739442013-05-22 18:42:56 -07003998 netlbl_secattr_destroy(&secattr);
Casey Schaufler6d3dc072008-12-31 12:54:12 -05003999
Casey Schaufler69f287a2014-12-12 17:08:40 -08004000#ifdef CONFIG_SECURITY_SMACK_NETFILTER
4001access_check:
4002#endif
Etienne Bassetecfcc532009-04-08 20:40:06 +02004003#ifdef CONFIG_AUDIT
Casey Schauflerc6739442013-05-22 18:42:56 -07004004 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
4005 ad.a.u.net->family = sk->sk_family;
4006 ad.a.u.net->netif = skb->skb_iif;
4007 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
Etienne Bassetecfcc532009-04-08 20:40:06 +02004008#endif
Casey Schauflerc6739442013-05-22 18:42:56 -07004009 /*
4010 * Receiving a packet requires that the other end
4011 * be able to write here. Read access is not required.
4012 * This is the simplist possible security model
4013 * for networking.
4014 */
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02004015 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
4016 rc = smk_bu_note("IPv4 delivery", skp, ssp->smk_in,
Casey Schauflerd166c802014-08-27 14:51:27 -07004017 MAY_WRITE, rc);
Casey Schauflerc6739442013-05-22 18:42:56 -07004018 if (rc != 0)
Huw Daviesa04e71f2016-06-27 15:06:16 -04004019 netlbl_skbuff_err(skb, sk->sk_family, rc, 0);
Casey Schauflerc6739442013-05-22 18:42:56 -07004020 break;
Casey Schaufler69f287a2014-12-12 17:08:40 -08004021#if IS_ENABLED(CONFIG_IPV6)
Casey Schauflerc6739442013-05-22 18:42:56 -07004022 case PF_INET6:
Casey Schaufler69f287a2014-12-12 17:08:40 -08004023 proto = smk_skb_to_addr_ipv6(skb, &sadd);
4024 if (proto != IPPROTO_UDP && proto != IPPROTO_TCP)
4025 break;
Casey Schaufler21abb1e2015-07-22 14:25:31 -07004026#ifdef SMACK_IPV6_SECMARK_LABELING
Casey Schaufler69f287a2014-12-12 17:08:40 -08004027 if (skb && skb->secmark != 0)
4028 skp = smack_from_secid(skb->secmark);
Casey Schauflerc6739442013-05-22 18:42:56 -07004029 else
Casey Schaufler21abb1e2015-07-22 14:25:31 -07004030 skp = smack_ipv6host_label(&sadd);
4031 if (skp == NULL)
Casey Schaufler69f287a2014-12-12 17:08:40 -08004032 skp = smack_net_ambient;
4033#ifdef CONFIG_AUDIT
4034 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
4035 ad.a.u.net->family = sk->sk_family;
4036 ad.a.u.net->netif = skb->skb_iif;
4037 ipv6_skb_to_auditdata(skb, &ad.a, NULL);
4038#endif /* CONFIG_AUDIT */
4039 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
4040 rc = smk_bu_note("IPv6 delivery", skp, ssp->smk_in,
4041 MAY_WRITE, rc);
Casey Schaufler21abb1e2015-07-22 14:25:31 -07004042#endif /* SMACK_IPV6_SECMARK_LABELING */
4043#ifdef SMACK_IPV6_PORT_LABELING
Casey Schaufler69f287a2014-12-12 17:08:40 -08004044 rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING);
Casey Schaufler21abb1e2015-07-22 14:25:31 -07004045#endif /* SMACK_IPV6_PORT_LABELING */
Casey Schauflerc6739442013-05-22 18:42:56 -07004046 break;
Casey Schaufler69f287a2014-12-12 17:08:40 -08004047#endif /* CONFIG_IPV6 */
Casey Schauflerc6739442013-05-22 18:42:56 -07004048 }
Casey Schaufler69f287a2014-12-12 17:08:40 -08004049
Paul Moorea8134292008-10-10 10:16:31 -04004050 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -08004051}
4052
4053/**
4054 * smack_socket_getpeersec_stream - pull in packet label
4055 * @sock: the socket
4056 * @optval: user's destination
4057 * @optlen: size thereof
Randy Dunlap251a2a92009-02-18 11:42:33 -08004058 * @len: max thereof
Casey Schauflere114e472008-02-04 22:29:50 -08004059 *
4060 * returns zero on success, an error code otherwise
4061 */
4062static int smack_socket_getpeersec_stream(struct socket *sock,
4063 char __user *optval,
4064 int __user *optlen, unsigned len)
4065{
4066 struct socket_smack *ssp;
Casey Schaufler272cd7a2011-09-20 12:24:36 -07004067 char *rcp = "";
4068 int slen = 1;
Casey Schauflere114e472008-02-04 22:29:50 -08004069 int rc = 0;
4070
4071 ssp = sock->sk->sk_security;
Casey Schaufler272cd7a2011-09-20 12:24:36 -07004072 if (ssp->smk_packet != NULL) {
Casey Schaufler54e70ec2014-04-10 16:37:08 -07004073 rcp = ssp->smk_packet->smk_known;
Casey Schaufler272cd7a2011-09-20 12:24:36 -07004074 slen = strlen(rcp) + 1;
4075 }
Casey Schauflere114e472008-02-04 22:29:50 -08004076
4077 if (slen > len)
4078 rc = -ERANGE;
Casey Schaufler272cd7a2011-09-20 12:24:36 -07004079 else if (copy_to_user(optval, rcp, slen) != 0)
Casey Schauflere114e472008-02-04 22:29:50 -08004080 rc = -EFAULT;
4081
4082 if (put_user(slen, optlen) != 0)
4083 rc = -EFAULT;
4084
4085 return rc;
4086}
4087
4088
4089/**
4090 * smack_socket_getpeersec_dgram - pull in packet label
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08004091 * @sock: the peer socket
Casey Schauflere114e472008-02-04 22:29:50 -08004092 * @skb: packet data
4093 * @secid: pointer to where to put the secid of the packet
4094 *
4095 * Sets the netlabel socket state on sk from parent
4096 */
4097static int smack_socket_getpeersec_dgram(struct socket *sock,
4098 struct sk_buff *skb, u32 *secid)
4099
4100{
4101 struct netlbl_lsm_secattr secattr;
Casey Schaufler272cd7a2011-09-20 12:24:36 -07004102 struct socket_smack *ssp = NULL;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07004103 struct smack_known *skp;
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08004104 int family = PF_UNSPEC;
4105 u32 s = 0; /* 0 is the invalid secid */
Casey Schauflere114e472008-02-04 22:29:50 -08004106 int rc;
4107
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08004108 if (skb != NULL) {
4109 if (skb->protocol == htons(ETH_P_IP))
4110 family = PF_INET;
Casey Schaufler69f287a2014-12-12 17:08:40 -08004111#if IS_ENABLED(CONFIG_IPV6)
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08004112 else if (skb->protocol == htons(ETH_P_IPV6))
4113 family = PF_INET6;
Casey Schaufler69f287a2014-12-12 17:08:40 -08004114#endif /* CONFIG_IPV6 */
Casey Schauflere114e472008-02-04 22:29:50 -08004115 }
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08004116 if (family == PF_UNSPEC && sock != NULL)
4117 family = sock->sk->sk_family;
Casey Schauflere114e472008-02-04 22:29:50 -08004118
Casey Schaufler69f287a2014-12-12 17:08:40 -08004119 switch (family) {
4120 case PF_UNIX:
Casey Schaufler272cd7a2011-09-20 12:24:36 -07004121 ssp = sock->sk->sk_security;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07004122 s = ssp->smk_out->smk_secid;
Casey Schaufler69f287a2014-12-12 17:08:40 -08004123 break;
4124 case PF_INET:
4125#ifdef CONFIG_SECURITY_SMACK_NETFILTER
4126 s = skb->secmark;
4127 if (s != 0)
4128 break;
4129#endif
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08004130 /*
4131 * Translate what netlabel gave us.
4132 */
Casey Schaufler272cd7a2011-09-20 12:24:36 -07004133 if (sock != NULL && sock->sk != NULL)
4134 ssp = sock->sk->sk_security;
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08004135 netlbl_secattr_init(&secattr);
4136 rc = netlbl_skbuff_getattr(skb, family, &secattr);
4137 if (rc == 0) {
Casey Schaufler2f823ff2013-05-22 18:43:03 -07004138 skp = smack_from_secattr(&secattr, ssp);
4139 s = skp->smk_secid;
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08004140 }
4141 netlbl_secattr_destroy(&secattr);
Casey Schaufler69f287a2014-12-12 17:08:40 -08004142 break;
Casey Schaufler69f287a2014-12-12 17:08:40 -08004143 case PF_INET6:
Casey Schaufler21abb1e2015-07-22 14:25:31 -07004144#ifdef SMACK_IPV6_SECMARK_LABELING
Casey Schaufler69f287a2014-12-12 17:08:40 -08004145 s = skb->secmark;
Casey Schaufler21abb1e2015-07-22 14:25:31 -07004146#endif
Casey Schaufler69f287a2014-12-12 17:08:40 -08004147 break;
Casey Schauflerb4e0d5f2010-11-24 17:12:10 -08004148 }
4149 *secid = s;
Casey Schauflere114e472008-02-04 22:29:50 -08004150 if (s == 0)
4151 return -EINVAL;
Casey Schauflere114e472008-02-04 22:29:50 -08004152 return 0;
4153}
4154
4155/**
Paul Moore07feee82009-03-27 17:10:54 -04004156 * smack_sock_graft - Initialize a newly created socket with an existing sock
4157 * @sk: child sock
4158 * @parent: parent socket
Casey Schauflere114e472008-02-04 22:29:50 -08004159 *
Paul Moore07feee82009-03-27 17:10:54 -04004160 * Set the smk_{in,out} state of an existing sock based on the process that
4161 * is creating the new socket.
Casey Schauflere114e472008-02-04 22:29:50 -08004162 */
4163static void smack_sock_graft(struct sock *sk, struct socket *parent)
4164{
4165 struct socket_smack *ssp;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07004166 struct smack_known *skp = smk_of_current();
Casey Schauflere114e472008-02-04 22:29:50 -08004167
Paul Moore07feee82009-03-27 17:10:54 -04004168 if (sk == NULL ||
4169 (sk->sk_family != PF_INET && sk->sk_family != PF_INET6))
Casey Schauflere114e472008-02-04 22:29:50 -08004170 return;
4171
4172 ssp = sk->sk_security;
Casey Schaufler54e70ec2014-04-10 16:37:08 -07004173 ssp->smk_in = skp;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07004174 ssp->smk_out = skp;
Paul Moore07feee82009-03-27 17:10:54 -04004175 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
Casey Schauflere114e472008-02-04 22:29:50 -08004176}
4177
4178/**
4179 * smack_inet_conn_request - Smack access check on connect
4180 * @sk: socket involved
4181 * @skb: packet
4182 * @req: unused
4183 *
4184 * Returns 0 if a task with the packet label could write to
4185 * the socket, otherwise an error code
4186 */
4187static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
4188 struct request_sock *req)
4189{
Paul Moore07feee82009-03-27 17:10:54 -04004190 u16 family = sk->sk_family;
Casey Schauflerf7112e62012-05-06 15:22:02 -07004191 struct smack_known *skp;
Casey Schauflere114e472008-02-04 22:29:50 -08004192 struct socket_smack *ssp = sk->sk_security;
Paul Moore07feee82009-03-27 17:10:54 -04004193 struct netlbl_lsm_secattr secattr;
4194 struct sockaddr_in addr;
4195 struct iphdr *hdr;
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02004196 struct smack_known *hskp;
Casey Schauflere114e472008-02-04 22:29:50 -08004197 int rc;
Etienne Bassetecfcc532009-04-08 20:40:06 +02004198 struct smk_audit_info ad;
Kees Cook923e9a12012-04-10 13:26:44 -07004199#ifdef CONFIG_AUDIT
Eric Paris48c62af2012-04-02 13:15:44 -04004200 struct lsm_network_audit net;
Kees Cook923e9a12012-04-10 13:26:44 -07004201#endif
Casey Schauflere114e472008-02-04 22:29:50 -08004202
Casey Schaufler69f287a2014-12-12 17:08:40 -08004203#if IS_ENABLED(CONFIG_IPV6)
Casey Schauflerc6739442013-05-22 18:42:56 -07004204 if (family == PF_INET6) {
4205 /*
4206 * Handle mapped IPv4 packets arriving
4207 * via IPv6 sockets. Don't set up netlabel
4208 * processing on IPv6.
4209 */
4210 if (skb->protocol == htons(ETH_P_IP))
4211 family = PF_INET;
4212 else
4213 return 0;
4214 }
Casey Schaufler69f287a2014-12-12 17:08:40 -08004215#endif /* CONFIG_IPV6 */
Casey Schauflere114e472008-02-04 22:29:50 -08004216
Casey Schaufler7f368ad2015-02-11 12:52:32 -08004217#ifdef CONFIG_SECURITY_SMACK_NETFILTER
4218 /*
4219 * If there is a secmark use it rather than the CIPSO label.
4220 * If there is no secmark fall back to CIPSO.
4221 * The secmark is assumed to reflect policy better.
4222 */
4223 if (skb && skb->secmark != 0) {
4224 skp = smack_from_secid(skb->secmark);
4225 goto access_check;
4226 }
4227#endif /* CONFIG_SECURITY_SMACK_NETFILTER */
4228
Paul Moore07feee82009-03-27 17:10:54 -04004229 netlbl_secattr_init(&secattr);
4230 rc = netlbl_skbuff_getattr(skb, family, &secattr);
Casey Schauflere114e472008-02-04 22:29:50 -08004231 if (rc == 0)
Casey Schaufler2f823ff2013-05-22 18:43:03 -07004232 skp = smack_from_secattr(&secattr, ssp);
Casey Schauflere114e472008-02-04 22:29:50 -08004233 else
Casey Schaufler2f823ff2013-05-22 18:43:03 -07004234 skp = &smack_known_huh;
Paul Moore07feee82009-03-27 17:10:54 -04004235 netlbl_secattr_destroy(&secattr);
4236
Casey Schaufler7f368ad2015-02-11 12:52:32 -08004237#ifdef CONFIG_SECURITY_SMACK_NETFILTER
4238access_check:
4239#endif
4240
Etienne Bassetecfcc532009-04-08 20:40:06 +02004241#ifdef CONFIG_AUDIT
Eric Paris48c62af2012-04-02 13:15:44 -04004242 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
4243 ad.a.u.net->family = family;
4244 ad.a.u.net->netif = skb->skb_iif;
Etienne Bassetecfcc532009-04-08 20:40:06 +02004245 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
4246#endif
Casey Schauflere114e472008-02-04 22:29:50 -08004247 /*
Paul Moore07feee82009-03-27 17:10:54 -04004248 * Receiving a packet requires that the other end be able to write
4249 * here. Read access is not required.
Casey Schauflere114e472008-02-04 22:29:50 -08004250 */
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02004251 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
4252 rc = smk_bu_note("IPv4 connect", skp, ssp->smk_in, MAY_WRITE, rc);
Paul Moore07feee82009-03-27 17:10:54 -04004253 if (rc != 0)
4254 return rc;
4255
4256 /*
4257 * Save the peer's label in the request_sock so we can later setup
4258 * smk_packet in the child socket so that SO_PEERCRED can report it.
4259 */
Casey Schaufler2f823ff2013-05-22 18:43:03 -07004260 req->peer_secid = skp->smk_secid;
Paul Moore07feee82009-03-27 17:10:54 -04004261
4262 /*
4263 * We need to decide if we want to label the incoming connection here
4264 * if we do we only need to label the request_sock and the stack will
Lucas De Marchi25985ed2011-03-30 22:57:33 -03004265 * propagate the wire-label to the sock when it is created.
Paul Moore07feee82009-03-27 17:10:54 -04004266 */
4267 hdr = ip_hdr(skb);
4268 addr.sin_addr.s_addr = hdr->saddr;
4269 rcu_read_lock();
Casey Schaufler21abb1e2015-07-22 14:25:31 -07004270 hskp = smack_ipv4host_label(&addr);
Casey Schauflerf7112e62012-05-06 15:22:02 -07004271 rcu_read_unlock();
4272
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02004273 if (hskp == NULL)
Casey Schauflerf7112e62012-05-06 15:22:02 -07004274 rc = netlbl_req_setattr(req, &skp->smk_netlabel);
Casey Schaufler2f823ff2013-05-22 18:43:03 -07004275 else
Paul Moore07feee82009-03-27 17:10:54 -04004276 netlbl_req_delattr(req);
Casey Schauflere114e472008-02-04 22:29:50 -08004277
4278 return rc;
4279}
4280
Paul Moore07feee82009-03-27 17:10:54 -04004281/**
4282 * smack_inet_csk_clone - Copy the connection information to the new socket
4283 * @sk: the new socket
4284 * @req: the connection's request_sock
4285 *
4286 * Transfer the connection's peer label to the newly created socket.
4287 */
4288static void smack_inet_csk_clone(struct sock *sk,
4289 const struct request_sock *req)
4290{
4291 struct socket_smack *ssp = sk->sk_security;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07004292 struct smack_known *skp;
Paul Moore07feee82009-03-27 17:10:54 -04004293
Casey Schaufler2f823ff2013-05-22 18:43:03 -07004294 if (req->peer_secid != 0) {
4295 skp = smack_from_secid(req->peer_secid);
Casey Schaufler54e70ec2014-04-10 16:37:08 -07004296 ssp->smk_packet = skp;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07004297 } else
Casey Schaufler272cd7a2011-09-20 12:24:36 -07004298 ssp->smk_packet = NULL;
Paul Moore07feee82009-03-27 17:10:54 -04004299}
4300
Casey Schauflere114e472008-02-04 22:29:50 -08004301/*
4302 * Key management security hooks
4303 *
4304 * Casey has not tested key support very heavily.
4305 * The permission check is most likely too restrictive.
4306 * If you care about keys please have a look.
4307 */
4308#ifdef CONFIG_KEYS
4309
4310/**
4311 * smack_key_alloc - Set the key security blob
4312 * @key: object
David Howellsd84f4f92008-11-14 10:39:23 +11004313 * @cred: the credentials to use
Casey Schauflere114e472008-02-04 22:29:50 -08004314 * @flags: unused
4315 *
4316 * No allocation required
4317 *
4318 * Returns 0
4319 */
David Howellsd84f4f92008-11-14 10:39:23 +11004320static int smack_key_alloc(struct key *key, const struct cred *cred,
Casey Schauflere114e472008-02-04 22:29:50 -08004321 unsigned long flags)
4322{
Casey Schaufler2f823ff2013-05-22 18:43:03 -07004323 struct smack_known *skp = smk_of_task(cred->security);
4324
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02004325 key->security = skp;
Casey Schauflere114e472008-02-04 22:29:50 -08004326 return 0;
4327}
4328
4329/**
4330 * smack_key_free - Clear the key security blob
4331 * @key: the object
4332 *
4333 * Clear the blob pointer
4334 */
4335static void smack_key_free(struct key *key)
4336{
4337 key->security = NULL;
4338}
4339
Lukasz Pawelczyk1a289792014-11-26 15:31:06 +01004340/**
Casey Schauflere114e472008-02-04 22:29:50 -08004341 * smack_key_permission - Smack access on a key
4342 * @key_ref: gets to the object
David Howellsd84f4f92008-11-14 10:39:23 +11004343 * @cred: the credentials to use
Lukasz Pawelczyk1a289792014-11-26 15:31:06 +01004344 * @perm: requested key permissions
Casey Schauflere114e472008-02-04 22:29:50 -08004345 *
4346 * Return 0 if the task has read and write to the object,
4347 * an error code otherwise
4348 */
4349static int smack_key_permission(key_ref_t key_ref,
David Howellsf5895942014-03-14 17:44:49 +00004350 const struct cred *cred, unsigned perm)
Casey Schauflere114e472008-02-04 22:29:50 -08004351{
4352 struct key *keyp;
Etienne Bassetecfcc532009-04-08 20:40:06 +02004353 struct smk_audit_info ad;
Casey Schaufler2f823ff2013-05-22 18:43:03 -07004354 struct smack_known *tkp = smk_of_task(cred->security);
Dmitry Kasatkinfffea212014-03-14 17:44:49 +00004355 int request = 0;
Casey Schauflerd166c802014-08-27 14:51:27 -07004356 int rc;
Casey Schauflere114e472008-02-04 22:29:50 -08004357
4358 keyp = key_ref_to_ptr(key_ref);
4359 if (keyp == NULL)
4360 return -EINVAL;
4361 /*
4362 * If the key hasn't been initialized give it access so that
4363 * it may do so.
4364 */
4365 if (keyp->security == NULL)
4366 return 0;
4367 /*
4368 * This should not occur
4369 */
Casey Schaufler2f823ff2013-05-22 18:43:03 -07004370 if (tkp == NULL)
Casey Schauflere114e472008-02-04 22:29:50 -08004371 return -EACCES;
Etienne Bassetecfcc532009-04-08 20:40:06 +02004372#ifdef CONFIG_AUDIT
4373 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY);
4374 ad.a.u.key_struct.key = keyp->serial;
4375 ad.a.u.key_struct.key_desc = keyp->description;
4376#endif
Dmitry Kasatkinfffea212014-03-14 17:44:49 +00004377 if (perm & KEY_NEED_READ)
4378 request = MAY_READ;
4379 if (perm & (KEY_NEED_WRITE | KEY_NEED_LINK | KEY_NEED_SETATTR))
4380 request = MAY_WRITE;
Casey Schauflerd166c802014-08-27 14:51:27 -07004381 rc = smk_access(tkp, keyp->security, request, &ad);
4382 rc = smk_bu_note("key access", tkp, keyp->security, request, rc);
4383 return rc;
Casey Schauflere114e472008-02-04 22:29:50 -08004384}
José Bollo7fc5f362015-02-17 15:41:22 +01004385
4386/*
4387 * smack_key_getsecurity - Smack label tagging the key
4388 * @key points to the key to be queried
4389 * @_buffer points to a pointer that should be set to point to the
4390 * resulting string (if no label or an error occurs).
4391 * Return the length of the string (including terminating NUL) or -ve if
4392 * an error.
4393 * May also return 0 (and a NULL buffer pointer) if there is no label.
4394 */
4395static int smack_key_getsecurity(struct key *key, char **_buffer)
4396{
4397 struct smack_known *skp = key->security;
4398 size_t length;
4399 char *copy;
4400
4401 if (key->security == NULL) {
4402 *_buffer = NULL;
4403 return 0;
4404 }
4405
4406 copy = kstrdup(skp->smk_known, GFP_KERNEL);
4407 if (copy == NULL)
4408 return -ENOMEM;
4409 length = strlen(copy) + 1;
4410
4411 *_buffer = copy;
4412 return length;
4413}
4414
Casey Schauflere114e472008-02-04 22:29:50 -08004415#endif /* CONFIG_KEYS */
4416
4417/*
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10004418 * Smack Audit hooks
4419 *
4420 * Audit requires a unique representation of each Smack specific
4421 * rule. This unique representation is used to distinguish the
4422 * object to be audited from remaining kernel objects and also
4423 * works as a glue between the audit hooks.
4424 *
4425 * Since repository entries are added but never deleted, we'll use
4426 * the smack_known label address related to the given audit rule as
4427 * the needed unique representation. This also better fits the smack
4428 * model where nearly everything is a label.
4429 */
4430#ifdef CONFIG_AUDIT
4431
4432/**
4433 * smack_audit_rule_init - Initialize a smack audit rule
4434 * @field: audit rule fields given from user-space (audit.h)
4435 * @op: required testing operator (=, !=, >, <, ...)
4436 * @rulestr: smack label to be audited
4437 * @vrule: pointer to save our own audit rule representation
4438 *
4439 * Prepare to audit cases where (@field @op @rulestr) is true.
4440 * The label to be audited is created if necessay.
4441 */
4442static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
4443{
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02004444 struct smack_known *skp;
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10004445 char **rule = (char **)vrule;
4446 *rule = NULL;
4447
4448 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
4449 return -EINVAL;
4450
Al Viro5af75d82008-12-16 05:59:26 -05004451 if (op != Audit_equal && op != Audit_not_equal)
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10004452 return -EINVAL;
4453
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02004454 skp = smk_import_entry(rulestr, 0);
Lukasz Pawelczyke774ad62015-04-20 17:12:54 +02004455 if (IS_ERR(skp))
4456 return PTR_ERR(skp);
4457
4458 *rule = skp->smk_known;
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10004459
4460 return 0;
4461}
4462
4463/**
4464 * smack_audit_rule_known - Distinguish Smack audit rules
4465 * @krule: rule of interest, in Audit kernel representation format
4466 *
4467 * This is used to filter Smack rules from remaining Audit ones.
4468 * If it's proved that this rule belongs to us, the
4469 * audit_rule_match hook will be called to do the final judgement.
4470 */
4471static int smack_audit_rule_known(struct audit_krule *krule)
4472{
4473 struct audit_field *f;
4474 int i;
4475
4476 for (i = 0; i < krule->field_count; i++) {
4477 f = &krule->fields[i];
4478
4479 if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER)
4480 return 1;
4481 }
4482
4483 return 0;
4484}
4485
4486/**
4487 * smack_audit_rule_match - Audit given object ?
4488 * @secid: security id for identifying the object to test
4489 * @field: audit rule flags given from user-space
4490 * @op: required testing operator
4491 * @vrule: smack internal rule presentation
4492 * @actx: audit context associated with the check
4493 *
4494 * The core Audit hook. It's used to take the decision of
4495 * whether to audit or not to audit a given object.
4496 */
4497static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule,
4498 struct audit_context *actx)
4499{
Casey Schaufler2f823ff2013-05-22 18:43:03 -07004500 struct smack_known *skp;
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10004501 char *rule = vrule;
4502
Richard Guy Briggs4eb0f4a2013-11-21 13:57:33 -05004503 if (unlikely(!rule)) {
4504 WARN_ONCE(1, "Smack: missing rule\n");
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10004505 return -ENOENT;
4506 }
4507
4508 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
4509 return 0;
4510
Casey Schaufler2f823ff2013-05-22 18:43:03 -07004511 skp = smack_from_secid(secid);
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10004512
4513 /*
4514 * No need to do string comparisons. If a match occurs,
4515 * both pointers will point to the same smack_known
4516 * label.
4517 */
Al Viro5af75d82008-12-16 05:59:26 -05004518 if (op == Audit_equal)
Casey Schaufler2f823ff2013-05-22 18:43:03 -07004519 return (rule == skp->smk_known);
Al Viro5af75d82008-12-16 05:59:26 -05004520 if (op == Audit_not_equal)
Casey Schaufler2f823ff2013-05-22 18:43:03 -07004521 return (rule != skp->smk_known);
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10004522
4523 return 0;
4524}
4525
Casey Schaufler491a0b02016-01-26 15:08:35 -08004526/*
4527 * There is no need for a smack_audit_rule_free hook.
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10004528 * No memory was allocated.
4529 */
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10004530
4531#endif /* CONFIG_AUDIT */
4532
Randy Dunlap251a2a92009-02-18 11:42:33 -08004533/**
David Quigley746df9b2013-05-22 12:50:35 -04004534 * smack_ismaclabel - check if xattr @name references a smack MAC label
4535 * @name: Full xattr name to check.
4536 */
4537static int smack_ismaclabel(const char *name)
4538{
4539 return (strcmp(name, XATTR_SMACK_SUFFIX) == 0);
4540}
4541
4542
4543/**
Casey Schauflere114e472008-02-04 22:29:50 -08004544 * smack_secid_to_secctx - return the smack label for a secid
4545 * @secid: incoming integer
4546 * @secdata: destination
4547 * @seclen: how long it is
4548 *
4549 * Exists for networking code.
4550 */
4551static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
4552{
Casey Schaufler2f823ff2013-05-22 18:43:03 -07004553 struct smack_known *skp = smack_from_secid(secid);
Casey Schauflere114e472008-02-04 22:29:50 -08004554
Eric Parisd5630b92010-10-13 16:24:48 -04004555 if (secdata)
Casey Schaufler2f823ff2013-05-22 18:43:03 -07004556 *secdata = skp->smk_known;
4557 *seclen = strlen(skp->smk_known);
Casey Schauflere114e472008-02-04 22:29:50 -08004558 return 0;
4559}
4560
Randy Dunlap251a2a92009-02-18 11:42:33 -08004561/**
Casey Schaufler4bc87e62008-02-15 15:24:25 -08004562 * smack_secctx_to_secid - return the secid for a smack label
4563 * @secdata: smack label
4564 * @seclen: how long result is
4565 * @secid: outgoing integer
4566 *
4567 * Exists for audit and networking code.
4568 */
David Howellse52c17642008-04-29 20:52:51 +01004569static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
Casey Schaufler4bc87e62008-02-15 15:24:25 -08004570{
Lukasz Pawelczyk21c7eae2014-08-29 17:02:55 +02004571 struct smack_known *skp = smk_find_entry(secdata);
4572
4573 if (skp)
4574 *secid = skp->smk_secid;
4575 else
4576 *secid = 0;
Casey Schaufler4bc87e62008-02-15 15:24:25 -08004577 return 0;
4578}
4579
Casey Schaufler491a0b02016-01-26 15:08:35 -08004580/*
4581 * There used to be a smack_release_secctx hook
4582 * that did nothing back when hooks were in a vector.
4583 * Now that there's a list such a hook adds cost.
Casey Schauflere114e472008-02-04 22:29:50 -08004584 */
Casey Schauflere114e472008-02-04 22:29:50 -08004585
David P. Quigley1ee65e32009-09-03 14:25:57 -04004586static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
4587{
4588 return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0);
4589}
4590
4591static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
4592{
4593 return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0);
4594}
4595
4596static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
4597{
4598 int len = 0;
4599 len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true);
4600
4601 if (len < 0)
4602 return len;
4603 *ctxlen = len;
4604 return 0;
4605}
4606
Casey Schauflerd6d80cb2017-09-28 14:54:50 -07004607static int smack_inode_copy_up(struct dentry *dentry, struct cred **new)
4608{
4609
4610 struct task_smack *tsp;
4611 struct smack_known *skp;
4612 struct inode_smack *isp;
4613 struct cred *new_creds = *new;
4614
4615 if (new_creds == NULL) {
4616 new_creds = prepare_creds();
4617 if (new_creds == NULL)
4618 return -ENOMEM;
4619 }
4620
4621 tsp = new_creds->security;
4622
4623 /*
4624 * Get label from overlay inode and set it in create_sid
4625 */
4626 isp = d_inode(dentry->d_parent)->i_security;
4627 skp = isp->smk_inode;
4628 tsp->smk_task = skp;
4629 *new = new_creds;
4630 return 0;
4631}
4632
4633static int smack_inode_copy_up_xattr(const char *name)
4634{
4635 /*
4636 * Return 1 if this is the smack access Smack attribute.
4637 */
4638 if (strcmp(name, XATTR_NAME_SMACK) == 0)
4639 return 1;
4640
4641 return -EOPNOTSUPP;
4642}
4643
4644static int smack_dentry_create_files_as(struct dentry *dentry, int mode,
4645 struct qstr *name,
4646 const struct cred *old,
4647 struct cred *new)
4648{
4649 struct task_smack *otsp = old->security;
4650 struct task_smack *ntsp = new->security;
4651 struct inode_smack *isp;
4652 int may;
4653
4654 /*
4655 * Use the process credential unless all of
4656 * the transmuting criteria are met
4657 */
4658 ntsp->smk_task = otsp->smk_task;
4659
4660 /*
4661 * the attribute of the containing directory
4662 */
4663 isp = d_inode(dentry->d_parent)->i_security;
4664
4665 if (isp->smk_flags & SMK_INODE_TRANSMUTE) {
4666 rcu_read_lock();
4667 may = smk_access_entry(otsp->smk_task->smk_known,
4668 isp->smk_inode->smk_known,
4669 &otsp->smk_task->smk_rules);
4670 rcu_read_unlock();
4671
4672 /*
4673 * If the directory is transmuting and the rule
4674 * providing access is transmuting use the containing
4675 * directory label instead of the process label.
4676 */
4677 if (may > 0 && (may & MAY_TRANSMUTE))
4678 ntsp->smk_task = isp->smk_inode;
4679 }
4680 return 0;
4681}
4682
James Morrisca97d932017-02-15 00:18:51 +11004683static struct security_hook_list smack_hooks[] __lsm_ro_after_init = {
Casey Schauflere20b0432015-05-02 15:11:36 -07004684 LSM_HOOK_INIT(ptrace_access_check, smack_ptrace_access_check),
4685 LSM_HOOK_INIT(ptrace_traceme, smack_ptrace_traceme),
4686 LSM_HOOK_INIT(syslog, smack_syslog),
Casey Schauflere114e472008-02-04 22:29:50 -08004687
Casey Schauflere20b0432015-05-02 15:11:36 -07004688 LSM_HOOK_INIT(sb_alloc_security, smack_sb_alloc_security),
4689 LSM_HOOK_INIT(sb_free_security, smack_sb_free_security),
4690 LSM_HOOK_INIT(sb_copy_data, smack_sb_copy_data),
4691 LSM_HOOK_INIT(sb_kern_mount, smack_sb_kern_mount),
4692 LSM_HOOK_INIT(sb_statfs, smack_sb_statfs),
Vivek Trivedi3bf27892015-06-22 15:36:06 +05304693 LSM_HOOK_INIT(sb_set_mnt_opts, smack_set_mnt_opts),
4694 LSM_HOOK_INIT(sb_parse_opts_str, smack_parse_opts_str),
Casey Schauflere114e472008-02-04 22:29:50 -08004695
Casey Schauflere20b0432015-05-02 15:11:36 -07004696 LSM_HOOK_INIT(bprm_set_creds, smack_bprm_set_creds),
Casey Schaufler676dac42010-12-02 06:43:39 -08004697
Casey Schauflere20b0432015-05-02 15:11:36 -07004698 LSM_HOOK_INIT(inode_alloc_security, smack_inode_alloc_security),
4699 LSM_HOOK_INIT(inode_free_security, smack_inode_free_security),
4700 LSM_HOOK_INIT(inode_init_security, smack_inode_init_security),
4701 LSM_HOOK_INIT(inode_link, smack_inode_link),
4702 LSM_HOOK_INIT(inode_unlink, smack_inode_unlink),
4703 LSM_HOOK_INIT(inode_rmdir, smack_inode_rmdir),
4704 LSM_HOOK_INIT(inode_rename, smack_inode_rename),
4705 LSM_HOOK_INIT(inode_permission, smack_inode_permission),
4706 LSM_HOOK_INIT(inode_setattr, smack_inode_setattr),
4707 LSM_HOOK_INIT(inode_getattr, smack_inode_getattr),
4708 LSM_HOOK_INIT(inode_setxattr, smack_inode_setxattr),
4709 LSM_HOOK_INIT(inode_post_setxattr, smack_inode_post_setxattr),
4710 LSM_HOOK_INIT(inode_getxattr, smack_inode_getxattr),
4711 LSM_HOOK_INIT(inode_removexattr, smack_inode_removexattr),
4712 LSM_HOOK_INIT(inode_getsecurity, smack_inode_getsecurity),
4713 LSM_HOOK_INIT(inode_setsecurity, smack_inode_setsecurity),
4714 LSM_HOOK_INIT(inode_listsecurity, smack_inode_listsecurity),
4715 LSM_HOOK_INIT(inode_getsecid, smack_inode_getsecid),
Casey Schauflere114e472008-02-04 22:29:50 -08004716
Casey Schauflere20b0432015-05-02 15:11:36 -07004717 LSM_HOOK_INIT(file_alloc_security, smack_file_alloc_security),
4718 LSM_HOOK_INIT(file_free_security, smack_file_free_security),
4719 LSM_HOOK_INIT(file_ioctl, smack_file_ioctl),
4720 LSM_HOOK_INIT(file_lock, smack_file_lock),
4721 LSM_HOOK_INIT(file_fcntl, smack_file_fcntl),
4722 LSM_HOOK_INIT(mmap_file, smack_mmap_file),
4723 LSM_HOOK_INIT(mmap_addr, cap_mmap_addr),
4724 LSM_HOOK_INIT(file_set_fowner, smack_file_set_fowner),
4725 LSM_HOOK_INIT(file_send_sigiotask, smack_file_send_sigiotask),
4726 LSM_HOOK_INIT(file_receive, smack_file_receive),
Casey Schauflere114e472008-02-04 22:29:50 -08004727
Casey Schauflere20b0432015-05-02 15:11:36 -07004728 LSM_HOOK_INIT(file_open, smack_file_open),
Casey Schaufler531f1d42011-09-19 12:41:42 -07004729
Casey Schauflere20b0432015-05-02 15:11:36 -07004730 LSM_HOOK_INIT(cred_alloc_blank, smack_cred_alloc_blank),
4731 LSM_HOOK_INIT(cred_free, smack_cred_free),
4732 LSM_HOOK_INIT(cred_prepare, smack_cred_prepare),
4733 LSM_HOOK_INIT(cred_transfer, smack_cred_transfer),
4734 LSM_HOOK_INIT(kernel_act_as, smack_kernel_act_as),
4735 LSM_HOOK_INIT(kernel_create_files_as, smack_kernel_create_files_as),
4736 LSM_HOOK_INIT(task_setpgid, smack_task_setpgid),
4737 LSM_HOOK_INIT(task_getpgid, smack_task_getpgid),
4738 LSM_HOOK_INIT(task_getsid, smack_task_getsid),
4739 LSM_HOOK_INIT(task_getsecid, smack_task_getsecid),
4740 LSM_HOOK_INIT(task_setnice, smack_task_setnice),
4741 LSM_HOOK_INIT(task_setioprio, smack_task_setioprio),
4742 LSM_HOOK_INIT(task_getioprio, smack_task_getioprio),
4743 LSM_HOOK_INIT(task_setscheduler, smack_task_setscheduler),
4744 LSM_HOOK_INIT(task_getscheduler, smack_task_getscheduler),
4745 LSM_HOOK_INIT(task_movememory, smack_task_movememory),
4746 LSM_HOOK_INIT(task_kill, smack_task_kill),
Casey Schauflere20b0432015-05-02 15:11:36 -07004747 LSM_HOOK_INIT(task_to_inode, smack_task_to_inode),
Casey Schauflere114e472008-02-04 22:29:50 -08004748
Casey Schauflere20b0432015-05-02 15:11:36 -07004749 LSM_HOOK_INIT(ipc_permission, smack_ipc_permission),
4750 LSM_HOOK_INIT(ipc_getsecid, smack_ipc_getsecid),
Casey Schauflere114e472008-02-04 22:29:50 -08004751
Casey Schauflere20b0432015-05-02 15:11:36 -07004752 LSM_HOOK_INIT(msg_msg_alloc_security, smack_msg_msg_alloc_security),
4753 LSM_HOOK_INIT(msg_msg_free_security, smack_msg_msg_free_security),
Casey Schauflere114e472008-02-04 22:29:50 -08004754
Casey Schauflere20b0432015-05-02 15:11:36 -07004755 LSM_HOOK_INIT(msg_queue_alloc_security, smack_msg_queue_alloc_security),
4756 LSM_HOOK_INIT(msg_queue_free_security, smack_msg_queue_free_security),
4757 LSM_HOOK_INIT(msg_queue_associate, smack_msg_queue_associate),
4758 LSM_HOOK_INIT(msg_queue_msgctl, smack_msg_queue_msgctl),
4759 LSM_HOOK_INIT(msg_queue_msgsnd, smack_msg_queue_msgsnd),
4760 LSM_HOOK_INIT(msg_queue_msgrcv, smack_msg_queue_msgrcv),
Casey Schauflere114e472008-02-04 22:29:50 -08004761
Casey Schauflere20b0432015-05-02 15:11:36 -07004762 LSM_HOOK_INIT(shm_alloc_security, smack_shm_alloc_security),
4763 LSM_HOOK_INIT(shm_free_security, smack_shm_free_security),
4764 LSM_HOOK_INIT(shm_associate, smack_shm_associate),
4765 LSM_HOOK_INIT(shm_shmctl, smack_shm_shmctl),
4766 LSM_HOOK_INIT(shm_shmat, smack_shm_shmat),
Casey Schauflere114e472008-02-04 22:29:50 -08004767
Casey Schauflere20b0432015-05-02 15:11:36 -07004768 LSM_HOOK_INIT(sem_alloc_security, smack_sem_alloc_security),
4769 LSM_HOOK_INIT(sem_free_security, smack_sem_free_security),
4770 LSM_HOOK_INIT(sem_associate, smack_sem_associate),
4771 LSM_HOOK_INIT(sem_semctl, smack_sem_semctl),
4772 LSM_HOOK_INIT(sem_semop, smack_sem_semop),
Casey Schauflere114e472008-02-04 22:29:50 -08004773
Casey Schauflere20b0432015-05-02 15:11:36 -07004774 LSM_HOOK_INIT(d_instantiate, smack_d_instantiate),
Casey Schauflere114e472008-02-04 22:29:50 -08004775
Casey Schauflere20b0432015-05-02 15:11:36 -07004776 LSM_HOOK_INIT(getprocattr, smack_getprocattr),
4777 LSM_HOOK_INIT(setprocattr, smack_setprocattr),
Casey Schauflere114e472008-02-04 22:29:50 -08004778
Casey Schauflere20b0432015-05-02 15:11:36 -07004779 LSM_HOOK_INIT(unix_stream_connect, smack_unix_stream_connect),
4780 LSM_HOOK_INIT(unix_may_send, smack_unix_may_send),
Casey Schauflere114e472008-02-04 22:29:50 -08004781
Casey Schauflere20b0432015-05-02 15:11:36 -07004782 LSM_HOOK_INIT(socket_post_create, smack_socket_post_create),
Casey Schaufler21abb1e2015-07-22 14:25:31 -07004783#ifdef SMACK_IPV6_PORT_LABELING
Casey Schauflere20b0432015-05-02 15:11:36 -07004784 LSM_HOOK_INIT(socket_bind, smack_socket_bind),
Casey Schaufler21abb1e2015-07-22 14:25:31 -07004785#endif
Casey Schauflere20b0432015-05-02 15:11:36 -07004786 LSM_HOOK_INIT(socket_connect, smack_socket_connect),
4787 LSM_HOOK_INIT(socket_sendmsg, smack_socket_sendmsg),
4788 LSM_HOOK_INIT(socket_sock_rcv_skb, smack_socket_sock_rcv_skb),
4789 LSM_HOOK_INIT(socket_getpeersec_stream, smack_socket_getpeersec_stream),
4790 LSM_HOOK_INIT(socket_getpeersec_dgram, smack_socket_getpeersec_dgram),
4791 LSM_HOOK_INIT(sk_alloc_security, smack_sk_alloc_security),
4792 LSM_HOOK_INIT(sk_free_security, smack_sk_free_security),
4793 LSM_HOOK_INIT(sock_graft, smack_sock_graft),
4794 LSM_HOOK_INIT(inet_conn_request, smack_inet_conn_request),
4795 LSM_HOOK_INIT(inet_csk_clone, smack_inet_csk_clone),
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10004796
Casey Schauflere114e472008-02-04 22:29:50 -08004797 /* key management security hooks */
4798#ifdef CONFIG_KEYS
Casey Schauflere20b0432015-05-02 15:11:36 -07004799 LSM_HOOK_INIT(key_alloc, smack_key_alloc),
4800 LSM_HOOK_INIT(key_free, smack_key_free),
4801 LSM_HOOK_INIT(key_permission, smack_key_permission),
4802 LSM_HOOK_INIT(key_getsecurity, smack_key_getsecurity),
Casey Schauflere114e472008-02-04 22:29:50 -08004803#endif /* CONFIG_KEYS */
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10004804
4805 /* Audit hooks */
4806#ifdef CONFIG_AUDIT
Casey Schauflere20b0432015-05-02 15:11:36 -07004807 LSM_HOOK_INIT(audit_rule_init, smack_audit_rule_init),
4808 LSM_HOOK_INIT(audit_rule_known, smack_audit_rule_known),
4809 LSM_HOOK_INIT(audit_rule_match, smack_audit_rule_match),
Ahmed S. Darwishd20bdda2008-04-30 08:34:10 +10004810#endif /* CONFIG_AUDIT */
4811
Casey Schauflere20b0432015-05-02 15:11:36 -07004812 LSM_HOOK_INIT(ismaclabel, smack_ismaclabel),
4813 LSM_HOOK_INIT(secid_to_secctx, smack_secid_to_secctx),
4814 LSM_HOOK_INIT(secctx_to_secid, smack_secctx_to_secid),
Casey Schauflere20b0432015-05-02 15:11:36 -07004815 LSM_HOOK_INIT(inode_notifysecctx, smack_inode_notifysecctx),
4816 LSM_HOOK_INIT(inode_setsecctx, smack_inode_setsecctx),
4817 LSM_HOOK_INIT(inode_getsecctx, smack_inode_getsecctx),
Casey Schauflerd6d80cb2017-09-28 14:54:50 -07004818 LSM_HOOK_INIT(inode_copy_up, smack_inode_copy_up),
4819 LSM_HOOK_INIT(inode_copy_up_xattr, smack_inode_copy_up_xattr),
4820 LSM_HOOK_INIT(dentry_create_files_as, smack_dentry_create_files_as),
Casey Schauflere114e472008-02-04 22:29:50 -08004821};
4822
Etienne Basset7198e2e2009-03-24 20:53:24 +01004823
Casey Schaufler86812bb2012-04-17 18:55:46 -07004824static __init void init_smack_known_list(void)
Etienne Basset7198e2e2009-03-24 20:53:24 +01004825{
Casey Schaufler86812bb2012-04-17 18:55:46 -07004826 /*
Casey Schaufler86812bb2012-04-17 18:55:46 -07004827 * Initialize rule list locks
4828 */
4829 mutex_init(&smack_known_huh.smk_rules_lock);
4830 mutex_init(&smack_known_hat.smk_rules_lock);
4831 mutex_init(&smack_known_floor.smk_rules_lock);
4832 mutex_init(&smack_known_star.smk_rules_lock);
Casey Schaufler86812bb2012-04-17 18:55:46 -07004833 mutex_init(&smack_known_web.smk_rules_lock);
4834 /*
4835 * Initialize rule lists
4836 */
4837 INIT_LIST_HEAD(&smack_known_huh.smk_rules);
4838 INIT_LIST_HEAD(&smack_known_hat.smk_rules);
4839 INIT_LIST_HEAD(&smack_known_star.smk_rules);
4840 INIT_LIST_HEAD(&smack_known_floor.smk_rules);
Casey Schaufler86812bb2012-04-17 18:55:46 -07004841 INIT_LIST_HEAD(&smack_known_web.smk_rules);
4842 /*
4843 * Create the known labels list
4844 */
Tomasz Stanislawski4d7cf4a2013-06-11 14:55:13 +02004845 smk_insert_entry(&smack_known_huh);
4846 smk_insert_entry(&smack_known_hat);
4847 smk_insert_entry(&smack_known_star);
4848 smk_insert_entry(&smack_known_floor);
Tomasz Stanislawski4d7cf4a2013-06-11 14:55:13 +02004849 smk_insert_entry(&smack_known_web);
Etienne Basset7198e2e2009-03-24 20:53:24 +01004850}
4851
Casey Schauflere114e472008-02-04 22:29:50 -08004852/**
4853 * smack_init - initialize the smack system
4854 *
4855 * Returns 0
4856 */
4857static __init int smack_init(void)
4858{
David Howellsd84f4f92008-11-14 10:39:23 +11004859 struct cred *cred;
Casey Schaufler676dac42010-12-02 06:43:39 -08004860 struct task_smack *tsp;
David Howellsd84f4f92008-11-14 10:39:23 +11004861
Casey Schauflerb1d9e6b2015-05-02 15:11:42 -07004862 if (!security_module_enable("smack"))
Casey Schaufler7898e1f2011-01-17 08:05:27 -08004863 return 0;
4864
Rohit1a5b4722014-10-15 17:40:41 +05304865 smack_inode_cache = KMEM_CACHE(inode_smack, 0);
4866 if (!smack_inode_cache)
4867 return -ENOMEM;
4868
Casey Schaufler2f823ff2013-05-22 18:43:03 -07004869 tsp = new_task_smack(&smack_known_floor, &smack_known_floor,
4870 GFP_KERNEL);
Rohit1a5b4722014-10-15 17:40:41 +05304871 if (tsp == NULL) {
4872 kmem_cache_destroy(smack_inode_cache);
Casey Schaufler676dac42010-12-02 06:43:39 -08004873 return -ENOMEM;
Rohit1a5b4722014-10-15 17:40:41 +05304874 }
Casey Schaufler676dac42010-12-02 06:43:39 -08004875
José Bollod21b7b02015-10-02 15:15:56 +02004876 smack_enabled = 1;
4877
Casey Schaufler21abb1e2015-07-22 14:25:31 -07004878 pr_info("Smack: Initializing.\n");
4879#ifdef CONFIG_SECURITY_SMACK_NETFILTER
4880 pr_info("Smack: Netfilter enabled.\n");
4881#endif
4882#ifdef SMACK_IPV6_PORT_LABELING
4883 pr_info("Smack: IPv6 port labeling enabled.\n");
4884#endif
4885#ifdef SMACK_IPV6_SECMARK_LABELING
4886 pr_info("Smack: IPv6 Netfilter enabled.\n");
4887#endif
Casey Schauflere114e472008-02-04 22:29:50 -08004888
4889 /*
4890 * Set the security state for the initial task.
4891 */
David Howellsd84f4f92008-11-14 10:39:23 +11004892 cred = (struct cred *) current->cred;
Casey Schaufler676dac42010-12-02 06:43:39 -08004893 cred->security = tsp;
Casey Schauflere114e472008-02-04 22:29:50 -08004894
Casey Schaufler86812bb2012-04-17 18:55:46 -07004895 /* initialize the smack_known_list */
4896 init_smack_known_list();
Casey Schauflere114e472008-02-04 22:29:50 -08004897
4898 /*
4899 * Register with LSM
4900 */
Casey Schauflerd69dece52017-01-18 17:09:05 -08004901 security_add_hooks(smack_hooks, ARRAY_SIZE(smack_hooks), "smack");
Casey Schauflere114e472008-02-04 22:29:50 -08004902
4903 return 0;
4904}
4905
4906/*
4907 * Smack requires early initialization in order to label
4908 * all processes and objects when they are created.
4909 */
4910security_initcall(smack_init);