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[mirror_ubuntu-bionic-kernel.git] / security / smack / smack_lsm.c
CommitLineData
e114e473
CS		 1/*
2 * Simplified MAC Kernel (smack) security module
3 *
4 * This file contains the smack hook function implementations.
5 *
5c6d1125 6 * Authors:
e114e473 7 * Casey Schaufler <casey@schaufler-ca.com>
84088ba2 8 * Jarkko Sakkinen <jarkko.sakkinen@intel.com>
e114e473
CS		 9 *
10 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
07feee8f 11 * Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
82c21bfa 12 * Paul Moore <paul@paul-moore.com>
5c6d1125 13 * Copyright (C) 2010 Nokia Corporation
84088ba2 14 * Copyright (C) 2011 Intel Corporation.
e114e473
CS		 15 *
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>
e114e473
CS		 25#include <linux/kd.h>
26#include <asm/ioctls.h>
07feee8f 27#include <linux/ip.h>
e114e473
CS		 28#include <linux/tcp.h>
29#include <linux/udp.h>
c6739443 30#include <linux/dccp.h>
5a0e3ad6 31#include <linux/slab.h>
e114e473
CS		 32#include <linux/mutex.h>
33#include <linux/pipe_fs_i.h>
e114e473 34#include <net/cipso_ipv4.h>
c6739443
CS		 35#include <net/ip.h>
36#include <net/ipv6.h>
d20bdda6 37#include <linux/audit.h>
1fd7317d 38#include <linux/magic.h>
2a7dba39 39#include <linux/dcache.h>
16014d87 40#include <linux/personality.h>
40401530
AV		 41#include <linux/msg.h>
42#include <linux/shm.h>
43#include <linux/binfmts.h>
3bf2789c 44#include <linux/parser.h>
e114e473
CS		 45#include "smack.h"
46
5c6d1125
JS		 47#define TRANS_TRUE "TRUE"
48#define TRANS_TRUE_SIZE 4
49
c6739443
CS		 50#define SMK_CONNECTING 0
51#define SMK_RECEIVING 1
52#define SMK_SENDING 2
53
21abb1ec 54#ifdef SMACK_IPV6_PORT_LABELING
8b549ef4 55static LIST_HEAD(smk_ipv6_port_list);
21abb1ec 56#endif
1a5b472b 57static struct kmem_cache *smack_inode_cache;
69f287ae 58int smack_enabled;
c6739443 59
3d04c924 60static const match_table_t smk_mount_tokens = {
3bf2789c
VT		 61 {Opt_fsdefault, SMK_FSDEFAULT "%s"},
62 {Opt_fsfloor, SMK_FSFLOOR "%s"},
63 {Opt_fshat, SMK_FSHAT "%s"},
64 {Opt_fsroot, SMK_FSROOT "%s"},
65 {Opt_fstransmute, SMK_FSTRANS "%s"},
66 {Opt_error, NULL},
67};
68
3d04c924
CS		 69#ifdef CONFIG_SECURITY_SMACK_BRINGUP
70static char *smk_bu_mess[] = {
71 "Bringup Error", /* Unused */
72 "Bringup", /* SMACK_BRINGUP_ALLOW */
73 "Unconfined Subject", /* SMACK_UNCONFINED_SUBJECT */
74 "Unconfined Object", /* SMACK_UNCONFINED_OBJECT */
75};
76
d166c802
CS		 77static void smk_bu_mode(int mode, char *s)
78{
79 int i = 0;
80
81 if (mode & MAY_READ)
82 s[i++] = 'r';
83 if (mode & MAY_WRITE)
84 s[i++] = 'w';
85 if (mode & MAY_EXEC)
86 s[i++] = 'x';
87 if (mode & MAY_APPEND)
88 s[i++] = 'a';
89 if (mode & MAY_TRANSMUTE)
90 s[i++] = 't';
91 if (mode & MAY_LOCK)
92 s[i++] = 'l';
93 if (i == 0)
94 s[i++] = '-';
95 s[i] = '\0';
96}
97#endif
98
99#ifdef CONFIG_SECURITY_SMACK_BRINGUP
21c7eae2
LP		 100static int smk_bu_note(char *note, struct smack_known *sskp,
101 struct smack_known *oskp, int mode, int rc)
d166c802
CS		 102{
103 char acc[SMK_NUM_ACCESS_TYPE + 1];
104
105 if (rc <= 0)
106 return rc;
bf4b2fee
CS		 107 if (rc > SMACK_UNCONFINED_OBJECT)
108 rc = 0;
d166c802
CS		 109
110 smk_bu_mode(mode, acc);
bf4b2fee 111 pr_info("Smack %s: (%s %s %s) %s\n", smk_bu_mess[rc],
21c7eae2 112 sskp->smk_known, oskp->smk_known, acc, note);
d166c802
CS		 113 return 0;
114}
115#else
21c7eae2 116#define smk_bu_note(note, sskp, oskp, mode, RC) (RC)
d166c802
CS		 117#endif
118
119#ifdef CONFIG_SECURITY_SMACK_BRINGUP
21c7eae2
LP		 120static int smk_bu_current(char *note, struct smack_known *oskp,
121 int mode, int rc)
d166c802
CS		 122{
123 struct task_smack *tsp = current_security();
124 char acc[SMK_NUM_ACCESS_TYPE + 1];
125
126 if (rc <= 0)
127 return rc;
bf4b2fee
CS		 128 if (rc > SMACK_UNCONFINED_OBJECT)
129 rc = 0;
d166c802
CS		 130
131 smk_bu_mode(mode, acc);
bf4b2fee 132 pr_info("Smack %s: (%s %s %s) %s %s\n", smk_bu_mess[rc],
21c7eae2
LP		 133 tsp->smk_task->smk_known, oskp->smk_known,
134 acc, current->comm, note);
d166c802
CS		 135 return 0;
136}
137#else
21c7eae2 138#define smk_bu_current(note, oskp, mode, RC) (RC)
d166c802
CS		 139#endif
140
141#ifdef CONFIG_SECURITY_SMACK_BRINGUP
142static int smk_bu_task(struct task_struct *otp, int mode, int rc)
143{
144 struct task_smack *tsp = current_security();
6d1cff2a 145 struct smack_known *smk_task = smk_of_task_struct(otp);
d166c802
CS		 146 char acc[SMK_NUM_ACCESS_TYPE + 1];
147
148 if (rc <= 0)
149 return rc;
bf4b2fee
CS		 150 if (rc > SMACK_UNCONFINED_OBJECT)
151 rc = 0;
d166c802
CS		 152
153 smk_bu_mode(mode, acc);
bf4b2fee 154 pr_info("Smack %s: (%s %s %s) %s to %s\n", smk_bu_mess[rc],
6d1cff2a 155 tsp->smk_task->smk_known, smk_task->smk_known, acc,
d166c802
CS		 156 current->comm, otp->comm);
157 return 0;
158}
159#else
160#define smk_bu_task(otp, mode, RC) (RC)
161#endif
162
163#ifdef CONFIG_SECURITY_SMACK_BRINGUP
164static int smk_bu_inode(struct inode *inode, int mode, int rc)
165{
166 struct task_smack *tsp = current_security();
bf4b2fee 167 struct inode_smack *isp = inode->i_security;
d166c802
CS		 168 char acc[SMK_NUM_ACCESS_TYPE + 1];
169
bf4b2fee
CS		 170 if (isp->smk_flags & SMK_INODE_IMPURE)
171 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
172 inode->i_sb->s_id, inode->i_ino, current->comm);
173
d166c802
CS		 174 if (rc <= 0)
175 return rc;
bf4b2fee
CS		 176 if (rc > SMACK_UNCONFINED_OBJECT)
177 rc = 0;
178 if (rc == SMACK_UNCONFINED_SUBJECT &&
179 (mode & (MAY_WRITE | MAY_APPEND)))
180 isp->smk_flags |= SMK_INODE_IMPURE;
d166c802
CS		 181
182 smk_bu_mode(mode, acc);
bf4b2fee
CS		 183
184 pr_info("Smack %s: (%s %s %s) inode=(%s %ld) %s\n", smk_bu_mess[rc],
185 tsp->smk_task->smk_known, isp->smk_inode->smk_known, acc,
d166c802
CS		 186 inode->i_sb->s_id, inode->i_ino, current->comm);
187 return 0;
188}
189#else
190#define smk_bu_inode(inode, mode, RC) (RC)
191#endif
192
193#ifdef CONFIG_SECURITY_SMACK_BRINGUP
194static int smk_bu_file(struct file *file, int mode, int rc)
195{
196 struct task_smack *tsp = current_security();
197 struct smack_known *sskp = tsp->smk_task;
5e7270a6 198 struct inode *inode = file_inode(file);
bf4b2fee 199 struct inode_smack *isp = inode->i_security;
d166c802
CS		 200 char acc[SMK_NUM_ACCESS_TYPE + 1];
201
bf4b2fee
CS		 202 if (isp->smk_flags & SMK_INODE_IMPURE)
203 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
204 inode->i_sb->s_id, inode->i_ino, current->comm);
205
d166c802
CS		 206 if (rc <= 0)
207 return rc;
bf4b2fee
CS		 208 if (rc > SMACK_UNCONFINED_OBJECT)
209 rc = 0;
d166c802
CS		 210
211 smk_bu_mode(mode, acc);
bf4b2fee 212 pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc],
5e7270a6 213 sskp->smk_known, smk_of_inode(inode)->smk_known, acc,
a455589f 214 inode->i_sb->s_id, inode->i_ino, file,
d166c802
CS		 215 current->comm);
216 return 0;
217}
218#else
219#define smk_bu_file(file, mode, RC) (RC)
220#endif
221
222#ifdef CONFIG_SECURITY_SMACK_BRINGUP
223static int smk_bu_credfile(const struct cred *cred, struct file *file,
224 int mode, int rc)
225{
226 struct task_smack *tsp = cred->security;
227 struct smack_known *sskp = tsp->smk_task;
228 struct inode *inode = file->f_inode;
bf4b2fee 229 struct inode_smack *isp = inode->i_security;
d166c802
CS		 230 char acc[SMK_NUM_ACCESS_TYPE + 1];
231
bf4b2fee
CS		 232 if (isp->smk_flags & SMK_INODE_IMPURE)
233 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
234 inode->i_sb->s_id, inode->i_ino, current->comm);
235
d166c802
CS		 236 if (rc <= 0)
237 return rc;
bf4b2fee
CS		 238 if (rc > SMACK_UNCONFINED_OBJECT)
239 rc = 0;
d166c802
CS		 240
241 smk_bu_mode(mode, acc);
bf4b2fee 242 pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc],
21c7eae2 243 sskp->smk_known, smk_of_inode(inode)->smk_known, acc,
a455589f 244 inode->i_sb->s_id, inode->i_ino, file,
d166c802
CS		 245 current->comm);
246 return 0;
247}
248#else
249#define smk_bu_credfile(cred, file, mode, RC) (RC)
250#endif
251
e114e473
CS		 252/**
253 * smk_fetch - Fetch the smack label from a file.
1a28979b 254 * @name: type of the label (attribute)
e114e473
CS		 255 * @ip: a pointer to the inode
256 * @dp: a pointer to the dentry
257 *
e774ad68
LP		 258 * Returns a pointer to the master list entry for the Smack label,
259 * NULL if there was no label to fetch, or an error code.
e114e473 260 */
2f823ff8
CS		 261static struct smack_known *smk_fetch(const char *name, struct inode *ip,
262 struct dentry *dp)
e114e473
CS		 263{
264 int rc;
f7112e6c 265 char *buffer;
2f823ff8 266 struct smack_known *skp = NULL;
e114e473
CS		 267
268 if (ip->i_op->getxattr == NULL)
e774ad68 269 return ERR_PTR(-EOPNOTSUPP);
e114e473 270
f7112e6c
CS		 271 buffer = kzalloc(SMK_LONGLABEL, GFP_KERNEL);
272 if (buffer == NULL)
e774ad68 273 return ERR_PTR(-ENOMEM);
e114e473 274
f7112e6c 275 rc = ip->i_op->getxattr(dp, name, buffer, SMK_LONGLABEL);
e774ad68
LP		 276 if (rc < 0)
277 skp = ERR_PTR(rc);
278 else if (rc == 0)
279 skp = NULL;
280 else
2f823ff8 281 skp = smk_import_entry(buffer, rc);
f7112e6c
CS		 282
283 kfree(buffer);
284
2f823ff8 285 return skp;
e114e473
CS		 286}
287
288/**
289 * new_inode_smack - allocate an inode security blob
21c7eae2 290 * @skp: a pointer to the Smack label entry to use in the blob
e114e473
CS		 291 *
292 * Returns the new blob or NULL if there's no memory available
293 */
1eddfe8e 294static struct inode_smack *new_inode_smack(struct smack_known *skp)
e114e473
CS		 295{
296 struct inode_smack *isp;
297
1a5b472b 298 isp = kmem_cache_zalloc(smack_inode_cache, GFP_NOFS);
e114e473
CS		 299 if (isp == NULL)
300 return NULL;
301
21c7eae2 302 isp->smk_inode = skp;
e114e473
CS		 303 isp->smk_flags = 0;
304 mutex_init(&isp->smk_lock);
305
306 return isp;
307}
308
7898e1f8
CS		 309/**
310 * new_task_smack - allocate a task security blob
1a28979b
LP		 311 * @task: a pointer to the Smack label for the running task
312 * @forked: a pointer to the Smack label for the forked task
313 * @gfp: type of the memory for the allocation
7898e1f8
CS		 314 *
315 * Returns the new blob or NULL if there's no memory available
316 */
2f823ff8
CS		 317static struct task_smack *new_task_smack(struct smack_known *task,
318 struct smack_known *forked, gfp_t gfp)
7898e1f8
CS		 319{
320 struct task_smack *tsp;
321
322 tsp = kzalloc(sizeof(struct task_smack), gfp);
323 if (tsp == NULL)
324 return NULL;
325
326 tsp->smk_task = task;
327 tsp->smk_forked = forked;
328 INIT_LIST_HEAD(&tsp->smk_rules);
38416e53 329 INIT_LIST_HEAD(&tsp->smk_relabel);
7898e1f8
CS		 330 mutex_init(&tsp->smk_rules_lock);
331
332 return tsp;
333}
334
335/**
336 * smk_copy_rules - copy a rule set
1a28979b
LP		 337 * @nhead: new rules header pointer
338 * @ohead: old rules header pointer
339 * @gfp: type of the memory for the allocation
7898e1f8
CS		 340 *
341 * Returns 0 on success, -ENOMEM on error
342 */
343static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead,
344 gfp_t gfp)
345{
346 struct smack_rule *nrp;
347 struct smack_rule *orp;
348 int rc = 0;
349
350 INIT_LIST_HEAD(nhead);
351
352 list_for_each_entry_rcu(orp, ohead, list) {
353 nrp = kzalloc(sizeof(struct smack_rule), gfp);
354 if (nrp == NULL) {
355 rc = -ENOMEM;
356 break;
357 }
358 *nrp = *orp;
359 list_add_rcu(&nrp->list, nhead);
360 }
361 return rc;
362}
363
38416e53
ZJ		 364/**
365 * smk_copy_relabel - copy smk_relabel labels list
366 * @nhead: new rules header pointer
367 * @ohead: old rules header pointer
368 * @gfp: type of the memory for the allocation
369 *
370 * Returns 0 on success, -ENOMEM on error
371 */
372static int smk_copy_relabel(struct list_head *nhead, struct list_head *ohead,
373 gfp_t gfp)
374{
375 struct smack_known_list_elem *nklep;
376 struct smack_known_list_elem *oklep;
377
378 INIT_LIST_HEAD(nhead);
379
380 list_for_each_entry(oklep, ohead, list) {
381 nklep = kzalloc(sizeof(struct smack_known_list_elem), gfp);
382 if (nklep == NULL) {
383 smk_destroy_label_list(nhead);
384 return -ENOMEM;
385 }
386 nklep->smk_label = oklep->smk_label;
387 list_add(&nklep->list, nhead);
388 }
389
390 return 0;
391}
392
5663884c
LP		 393/**
394 * smk_ptrace_mode - helper function for converting PTRACE_MODE_* into MAY_*
395 * @mode - input mode in form of PTRACE_MODE_*
396 *
397 * Returns a converted MAY_* mode usable by smack rules
398 */
399static inline unsigned int smk_ptrace_mode(unsigned int mode)
400{
401 switch (mode) {
402 case PTRACE_MODE_READ:
403 return MAY_READ;
404 case PTRACE_MODE_ATTACH:
405 return MAY_READWRITE;
406 }
407
408 return 0;
409}
410
411/**
412 * smk_ptrace_rule_check - helper for ptrace access
413 * @tracer: tracer process
21c7eae2 414 * @tracee_known: label entry of the process that's about to be traced
5663884c
LP		 415 * @mode: ptrace attachment mode (PTRACE_MODE_*)
416 * @func: name of the function that called us, used for audit
417 *
418 * Returns 0 on access granted, -error on error
419 */
21c7eae2
LP		 420static int smk_ptrace_rule_check(struct task_struct *tracer,
421 struct smack_known *tracee_known,
5663884c
LP		 422 unsigned int mode, const char *func)
423{
424 int rc;
425 struct smk_audit_info ad, *saip = NULL;
426 struct task_smack *tsp;
21c7eae2 427 struct smack_known *tracer_known;
5663884c
LP		 428
429 if ((mode & PTRACE_MODE_NOAUDIT) == 0) {
430 smk_ad_init(&ad, func, LSM_AUDIT_DATA_TASK);
431 smk_ad_setfield_u_tsk(&ad, tracer);
432 saip = &ad;
433 }
434
6d1cff2a
AR		 435 rcu_read_lock();
436 tsp = __task_cred(tracer)->security;
21c7eae2 437 tracer_known = smk_of_task(tsp);
5663884c 438
66867818
LP		 439 if ((mode & PTRACE_MODE_ATTACH) &&
440 (smack_ptrace_rule == SMACK_PTRACE_EXACT ||
441 smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)) {
21c7eae2 442 if (tracer_known->smk_known == tracee_known->smk_known)
66867818
LP		 443 rc = 0;
444 else if (smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)
445 rc = -EACCES;
446 else if (capable(CAP_SYS_PTRACE))
447 rc = 0;
448 else
449 rc = -EACCES;
450
451 if (saip)
21c7eae2
LP		 452 smack_log(tracer_known->smk_known,
453 tracee_known->smk_known,
454 0, rc, saip);
66867818 455
6d1cff2a 456 rcu_read_unlock();
66867818
LP		 457 return rc;
458 }
459
460 /* In case of rule==SMACK_PTRACE_DEFAULT or mode==PTRACE_MODE_READ */
21c7eae2 461 rc = smk_tskacc(tsp, tracee_known, smk_ptrace_mode(mode), saip);
6d1cff2a
AR		 462
463 rcu_read_unlock();
5663884c
LP		 464 return rc;
465}
466
e114e473
CS		 467/*
468 * LSM hooks.
469 * We he, that is fun!
470 */
471
472/**
9e48858f 473 * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH
e114e473 474 * @ctp: child task pointer
5663884c 475 * @mode: ptrace attachment mode (PTRACE_MODE_*)
e114e473
CS		 476 *
477 * Returns 0 if access is OK, an error code otherwise
478 *
5663884c 479 * Do the capability checks.
e114e473 480 */
9e48858f 481static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode)
e114e473 482{
2f823ff8 483 struct smack_known *skp;
e114e473 484
6d1cff2a 485 skp = smk_of_task_struct(ctp);
ecfcc53f 486
b1d9e6b0 487 return smk_ptrace_rule_check(current, skp, mode, __func__);
5cd9c58f
DH		 488}
489
490/**
491 * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
492 * @ptp: parent task pointer
493 *
494 * Returns 0 if access is OK, an error code otherwise
495 *
5663884c 496 * Do the capability checks, and require PTRACE_MODE_ATTACH.
5cd9c58f
DH		 497 */
498static int smack_ptrace_traceme(struct task_struct *ptp)
499{
500 int rc;
2f823ff8 501 struct smack_known *skp;
5cd9c58f 502
959e6c7f 503 skp = smk_of_task(current_security());
ecfcc53f 504
21c7eae2 505 rc = smk_ptrace_rule_check(ptp, skp, PTRACE_MODE_ATTACH, __func__);
e114e473
CS		 506 return rc;
507}
508
509/**
510 * smack_syslog - Smack approval on syslog
511 * @type: message type
512 *
e114e473
CS		 513 * Returns 0 on success, error code otherwise.
514 */
12b3052c 515static int smack_syslog(int typefrom_file)
e114e473 516{
12b3052c 517 int rc = 0;
2f823ff8 518 struct smack_known *skp = smk_of_current();
e114e473 519
1880eff7 520 if (smack_privileged(CAP_MAC_OVERRIDE))
e114e473
CS		 521 return 0;
522
24ea1b6e 523 if (smack_syslog_label != NULL && smack_syslog_label != skp)
e114e473
CS		 524 rc = -EACCES;
525
526 return rc;
527}
528
529
530/*
531 * Superblock Hooks.
532 */
533
534/**
535 * smack_sb_alloc_security - allocate a superblock blob
536 * @sb: the superblock getting the blob
537 *
538 * Returns 0 on success or -ENOMEM on error.
539 */
540static int smack_sb_alloc_security(struct super_block *sb)
541{
542 struct superblock_smack *sbsp;
543
544 sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL);
545
546 if (sbsp == NULL)
547 return -ENOMEM;
548
21c7eae2
LP		 549 sbsp->smk_root = &smack_known_floor;
550 sbsp->smk_default = &smack_known_floor;
551 sbsp->smk_floor = &smack_known_floor;
552 sbsp->smk_hat = &smack_known_hat;
e830b394
CS		 553 /*
554 * smk_initialized will be zero from kzalloc.
555 */
e114e473
CS		 556 sb->s_security = sbsp;
557
558 return 0;
559}
560
561/**
562 * smack_sb_free_security - free a superblock blob
563 * @sb: the superblock getting the blob
564 *
565 */
566static void smack_sb_free_security(struct super_block *sb)
567{
568 kfree(sb->s_security);
569 sb->s_security = NULL;
570}
571
572/**
573 * smack_sb_copy_data - copy mount options data for processing
e114e473 574 * @orig: where to start
251a2a95 575 * @smackopts: mount options string
e114e473
CS		 576 *
577 * Returns 0 on success or -ENOMEM on error.
578 *
579 * Copy the Smack specific mount options out of the mount
580 * options list.
581 */
e0007529 582static int smack_sb_copy_data(char *orig, char *smackopts)
e114e473
CS		 583{
584 char *cp, *commap, *otheropts, *dp;
585
e114e473
CS		 586 otheropts = (char *)get_zeroed_page(GFP_KERNEL);
587 if (otheropts == NULL)
588 return -ENOMEM;
589
590 for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) {
591 if (strstr(cp, SMK_FSDEFAULT) == cp)
592 dp = smackopts;
593 else if (strstr(cp, SMK_FSFLOOR) == cp)
594 dp = smackopts;
595 else if (strstr(cp, SMK_FSHAT) == cp)
596 dp = smackopts;
597 else if (strstr(cp, SMK_FSROOT) == cp)
598 dp = smackopts;
e830b394
CS		 599 else if (strstr(cp, SMK_FSTRANS) == cp)
600 dp = smackopts;
e114e473
CS		 601 else
602 dp = otheropts;
603
604 commap = strchr(cp, ',');
605 if (commap != NULL)
606 *commap = '\0';
607
608 if (*dp != '\0')
609 strcat(dp, ",");
610 strcat(dp, cp);
611 }
612
613 strcpy(orig, otheropts);
614 free_page((unsigned long)otheropts);
615
616 return 0;
617}
618
619/**
3bf2789c
VT		 620 * smack_parse_opts_str - parse Smack specific mount options
621 * @options: mount options string
622 * @opts: where to store converted mount opts
623 *
624 * Returns 0 on success or -ENOMEM on error.
625 *
626 * converts Smack specific mount options to generic security option format
627 */
628static int smack_parse_opts_str(char *options,
629 struct security_mnt_opts *opts)
630{
631 char *p;
3d04c924
CS		 632 char *fsdefault = NULL;
633 char *fsfloor = NULL;
634 char *fshat = NULL;
635 char *fsroot = NULL;
636 char *fstransmute = NULL;
637 int rc = -ENOMEM;
638 int num_mnt_opts = 0;
639 int token;
3bf2789c
VT		 640
641 opts->num_mnt_opts = 0;
642
643 if (!options)
644 return 0;
645
646 while ((p = strsep(&options, ",")) != NULL) {
3bf2789c
VT		 647 substring_t args[MAX_OPT_ARGS];
648
649 if (!*p)
650 continue;
651
3d04c924 652 token = match_token(p, smk_mount_tokens, args);
3bf2789c
VT		 653
654 switch (token) {
655 case Opt_fsdefault:
656 if (fsdefault)
657 goto out_opt_err;
658 fsdefault = match_strdup(&args[0]);
659 if (!fsdefault)
660 goto out_err;
661 break;
662 case Opt_fsfloor:
663 if (fsfloor)
664 goto out_opt_err;
665 fsfloor = match_strdup(&args[0]);
666 if (!fsfloor)
667 goto out_err;
668 break;
669 case Opt_fshat:
670 if (fshat)
671 goto out_opt_err;
672 fshat = match_strdup(&args[0]);
673 if (!fshat)
674 goto out_err;
675 break;
676 case Opt_fsroot:
677 if (fsroot)
678 goto out_opt_err;
679 fsroot = match_strdup(&args[0]);
680 if (!fsroot)
681 goto out_err;
682 break;
683 case Opt_fstransmute:
684 if (fstransmute)
685 goto out_opt_err;
686 fstransmute = match_strdup(&args[0]);
687 if (!fstransmute)
688 goto out_err;
689 break;
690 default:
691 rc = -EINVAL;
692 pr_warn("Smack: unknown mount option\n");
693 goto out_err;
694 }
695 }
696
697 opts->mnt_opts = kcalloc(NUM_SMK_MNT_OPTS, sizeof(char *), GFP_ATOMIC);
698 if (!opts->mnt_opts)
699 goto out_err;
700
701 opts->mnt_opts_flags = kcalloc(NUM_SMK_MNT_OPTS, sizeof(int),
702 GFP_ATOMIC);
703 if (!opts->mnt_opts_flags) {
704 kfree(opts->mnt_opts);
705 goto out_err;
706 }
707
708 if (fsdefault) {
709 opts->mnt_opts[num_mnt_opts] = fsdefault;
710 opts->mnt_opts_flags[num_mnt_opts++] = FSDEFAULT_MNT;
711 }
712 if (fsfloor) {
713 opts->mnt_opts[num_mnt_opts] = fsfloor;
714 opts->mnt_opts_flags[num_mnt_opts++] = FSFLOOR_MNT;
715 }
716 if (fshat) {
717 opts->mnt_opts[num_mnt_opts] = fshat;
718 opts->mnt_opts_flags[num_mnt_opts++] = FSHAT_MNT;
719 }
720 if (fsroot) {
721 opts->mnt_opts[num_mnt_opts] = fsroot;
722 opts->mnt_opts_flags[num_mnt_opts++] = FSROOT_MNT;
723 }
724 if (fstransmute) {
725 opts->mnt_opts[num_mnt_opts] = fstransmute;
726 opts->mnt_opts_flags[num_mnt_opts++] = FSTRANS_MNT;
727 }
728
729 opts->num_mnt_opts = num_mnt_opts;
730 return 0;
731
732out_opt_err:
733 rc = -EINVAL;
734 pr_warn("Smack: duplicate mount options\n");
735
736out_err:
737 kfree(fsdefault);
738 kfree(fsfloor);
739 kfree(fshat);
740 kfree(fsroot);
741 kfree(fstransmute);
742 return rc;
743}
744
745/**
746 * smack_set_mnt_opts - set Smack specific mount options
e114e473 747 * @sb: the file system superblock
3bf2789c
VT		 748 * @opts: Smack mount options
749 * @kern_flags: mount option from kernel space or user space
750 * @set_kern_flags: where to store converted mount opts
e114e473
CS		 751 *
752 * Returns 0 on success, an error code on failure
3bf2789c
VT		 753 *
754 * Allow filesystems with binary mount data to explicitly set Smack mount
755 * labels.
e114e473 756 */
3bf2789c
VT		 757static int smack_set_mnt_opts(struct super_block *sb,
758 struct security_mnt_opts *opts,
759 unsigned long kern_flags,
760 unsigned long *set_kern_flags)
e114e473
CS		 761{
762 struct dentry *root = sb->s_root;
c6f493d6 763 struct inode *inode = d_backing_inode(root);
e114e473
CS		 764 struct superblock_smack *sp = sb->s_security;
765 struct inode_smack *isp;
24ea1b6e 766 struct smack_known *skp;
3bf2789c
VT		 767 int i;
768 int num_opts = opts->num_mnt_opts;
e830b394 769 int transmute = 0;
e114e473 770
e830b394 771 if (sp->smk_initialized)
e114e473 772 return 0;
eb982cb4 773
e114e473 774 sp->smk_initialized = 1;
e114e473 775
3bf2789c
VT		 776 for (i = 0; i < num_opts; i++) {
777 switch (opts->mnt_opts_flags[i]) {
778 case FSDEFAULT_MNT:
779 skp = smk_import_entry(opts->mnt_opts[i], 0);
e774ad68
LP		 780 if (IS_ERR(skp))
781 return PTR_ERR(skp);
3bf2789c
VT		 782 sp->smk_default = skp;
783 break;
784 case FSFLOOR_MNT:
785 skp = smk_import_entry(opts->mnt_opts[i], 0);
e774ad68
LP		 786 if (IS_ERR(skp))
787 return PTR_ERR(skp);
788 sp->smk_floor = skp;
3bf2789c
VT		 789 break;
790 case FSHAT_MNT:
791 skp = smk_import_entry(opts->mnt_opts[i], 0);
e774ad68
LP		 792 if (IS_ERR(skp))
793 return PTR_ERR(skp);
3bf2789c
VT		 794 sp->smk_hat = skp;
795 break;
796 case FSROOT_MNT:
797 skp = smk_import_entry(opts->mnt_opts[i], 0);
e774ad68
LP		 798 if (IS_ERR(skp))
799 return PTR_ERR(skp);
800 sp->smk_root = skp;
3bf2789c
VT		 801 break;
802 case FSTRANS_MNT:
803 skp = smk_import_entry(opts->mnt_opts[i], 0);
e774ad68
LP		 804 if (IS_ERR(skp))
805 return PTR_ERR(skp);
806 sp->smk_root = skp;
807 transmute = 1;
3bf2789c
VT		 808 break;
809 default:
810 break;
e114e473
CS		 811 }
812 }
813
24ea1b6e
CS		 814 if (!smack_privileged(CAP_MAC_ADMIN)) {
815 /*
816 * Unprivileged mounts don't get to specify Smack values.
817 */
3bf2789c 818 if (num_opts)
24ea1b6e
CS		 819 return -EPERM;
820 /*
821 * Unprivileged mounts get root and default from the caller.
822 */
823 skp = smk_of_current();
21c7eae2
LP		 824 sp->smk_root = skp;
825 sp->smk_default = skp;
24ea1b6e 826 }
3bf2789c 827
e114e473
CS		 828 /*
829 * Initialize the root inode.
830 */
831 isp = inode->i_security;
55dfc5da
JB		 832 if (isp == NULL) {
833 isp = new_inode_smack(sp->smk_root);
834 if (isp == NULL)
835 return -ENOMEM;
836 inode->i_security = isp;
e830b394 837 } else
e114e473
CS		 838 isp->smk_inode = sp->smk_root;
839
e830b394
CS		 840 if (transmute)
841 isp->smk_flags |= SMK_INODE_TRANSMUTE;
842
e114e473
CS		 843 return 0;
844}
845
3bf2789c
VT		 846/**
847 * smack_sb_kern_mount - Smack specific mount processing
848 * @sb: the file system superblock
849 * @flags: the mount flags
850 * @data: the smack mount options
851 *
852 * Returns 0 on success, an error code on failure
853 */
854static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data)
855{
856 int rc = 0;
857 char *options = data;
858 struct security_mnt_opts opts;
859
860 security_init_mnt_opts(&opts);
861
862 if (!options)
863 goto out;
864
865 rc = smack_parse_opts_str(options, &opts);
866 if (rc)
867 goto out_err;
868
869out:
870 rc = smack_set_mnt_opts(sb, &opts, 0, NULL);
871
872out_err:
873 security_free_mnt_opts(&opts);
874 return rc;
875}
876
e114e473
CS		 877/**
878 * smack_sb_statfs - Smack check on statfs
879 * @dentry: identifies the file system in question
880 *
881 * Returns 0 if current can read the floor of the filesystem,
882 * and error code otherwise
883 */
884static int smack_sb_statfs(struct dentry *dentry)
885{
886 struct superblock_smack *sbp = dentry->d_sb->s_security;
ecfcc53f
EB		 887 int rc;
888 struct smk_audit_info ad;
889
a269434d 890 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
ecfcc53f 891 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
e114e473 892
ecfcc53f 893 rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad);
d166c802 894 rc = smk_bu_current("statfs", sbp->smk_floor, MAY_READ, rc);
ecfcc53f 895 return rc;
e114e473
CS		 896}
897
676dac4b
CS		 898/*
899 * BPRM hooks
900 */
901
ce8a4321
CS		 902/**
903 * smack_bprm_set_creds - set creds for exec
904 * @bprm: the exec information
905 *
5663884c 906 * Returns 0 if it gets a blob, -EPERM if exec forbidden and -ENOMEM otherwise
ce8a4321 907 */
676dac4b
CS		 908static int smack_bprm_set_creds(struct linux_binprm *bprm)
909{
496ad9aa 910 struct inode *inode = file_inode(bprm->file);
84088ba2 911 struct task_smack *bsp = bprm->cred->security;
676dac4b 912 struct inode_smack *isp;
676dac4b
CS		 913 int rc;
914
676dac4b
CS		 915 if (bprm->cred_prepared)
916 return 0;
917
84088ba2
JS		 918 isp = inode->i_security;
919 if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task)
676dac4b
CS		 920 return 0;
921
5663884c
LP		 922 if (bprm->unsafe & (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) {
923 struct task_struct *tracer;
924 rc = 0;
925
926 rcu_read_lock();
927 tracer = ptrace_parent(current);
928 if (likely(tracer != NULL))
929 rc = smk_ptrace_rule_check(tracer,
21c7eae2 930 isp->smk_task,
5663884c
LP		 931 PTRACE_MODE_ATTACH,
932 __func__);
933 rcu_read_unlock();
934
935 if (rc != 0)
936 return rc;
937 } else if (bprm->unsafe)
84088ba2 938 return -EPERM;
676dac4b 939
84088ba2
JS		 940 bsp->smk_task = isp->smk_task;
941 bprm->per_clear |= PER_CLEAR_ON_SETID;
676dac4b 942
84088ba2
JS		 943 return 0;
944}
676dac4b 945
84088ba2
JS		 946/**
947 * smack_bprm_committing_creds - Prepare to install the new credentials
948 * from bprm.
949 *
950 * @bprm: binprm for exec
951 */
952static void smack_bprm_committing_creds(struct linux_binprm *bprm)
953{
954 struct task_smack *bsp = bprm->cred->security;
676dac4b 955
84088ba2
JS		 956 if (bsp->smk_task != bsp->smk_forked)
957 current->pdeath_signal = 0;
958}
959
960/**
961 * smack_bprm_secureexec - Return the decision to use secureexec.
962 * @bprm: binprm for exec
963 *
964 * Returns 0 on success.
965 */
966static int smack_bprm_secureexec(struct linux_binprm *bprm)
967{
968 struct task_smack *tsp = current_security();
84088ba2 969
b1d9e6b0
CS		 970 if (tsp->smk_task != tsp->smk_forked)
971 return 1;
84088ba2 972
b1d9e6b0 973 return 0;
676dac4b
CS		 974}
975
e114e473
CS		 976/*
977 * Inode hooks
978 */
979
980/**
981 * smack_inode_alloc_security - allocate an inode blob
251a2a95 982 * @inode: the inode in need of a blob
e114e473
CS		 983 *
984 * Returns 0 if it gets a blob, -ENOMEM otherwise
985 */
986static int smack_inode_alloc_security(struct inode *inode)
987{
2f823ff8
CS		 988 struct smack_known *skp = smk_of_current();
989
21c7eae2 990 inode->i_security = new_inode_smack(skp);
e114e473
CS		 991 if (inode->i_security == NULL)
992 return -ENOMEM;
993 return 0;
994}
995
996/**
997 * smack_inode_free_security - free an inode blob
251a2a95 998 * @inode: the inode with a blob
e114e473
CS		 999 *
1000 * Clears the blob pointer in inode
1001 */
1002static void smack_inode_free_security(struct inode *inode)
1003{
1a5b472b 1004 kmem_cache_free(smack_inode_cache, inode->i_security);
e114e473
CS		 1005 inode->i_security = NULL;
1006}
1007
1008/**
1009 * smack_inode_init_security - copy out the smack from an inode
e95ef49b
LP		 1010 * @inode: the newly created inode
1011 * @dir: containing directory object
2a7dba39 1012 * @qstr: unused
e114e473
CS		 1013 * @name: where to put the attribute name
1014 * @value: where to put the attribute value
1015 * @len: where to put the length of the attribute
1016 *
1017 * Returns 0 if it all works out, -ENOMEM if there's no memory
1018 */
1019static int smack_inode_init_security(struct inode *inode, struct inode *dir,
9548906b 1020 const struct qstr *qstr, const char **name,
2a7dba39 1021 void **value, size_t *len)
e114e473 1022{
2267b13a 1023 struct inode_smack *issp = inode->i_security;
2f823ff8 1024 struct smack_known *skp = smk_of_current();
21c7eae2
LP		 1025 struct smack_known *isp = smk_of_inode(inode);
1026 struct smack_known *dsp = smk_of_inode(dir);
7898e1f8 1027 int may;
e114e473 1028
9548906b
TH		 1029 if (name)
1030 *name = XATTR_SMACK_SUFFIX;
e114e473 1031
68390ccf 1032 if (value && len) {
7898e1f8 1033 rcu_read_lock();
21c7eae2
LP		 1034 may = smk_access_entry(skp->smk_known, dsp->smk_known,
1035 &skp->smk_rules);
7898e1f8 1036 rcu_read_unlock();
5c6d1125
JS		 1037
1038 /*
1039 * If the access rule allows transmutation and
1040 * the directory requests transmutation then
1041 * by all means transmute.
2267b13a 1042 * Mark the inode as changed.
5c6d1125 1043 */
7898e1f8 1044 if (may > 0 && ((may & MAY_TRANSMUTE) != 0) &&
2267b13a 1045 smk_inode_transmutable(dir)) {
5c6d1125 1046 isp = dsp;
2267b13a
CS		 1047 issp->smk_flags |= SMK_INODE_CHANGED;
1048 }
5c6d1125 1049
21c7eae2 1050 *value = kstrdup(isp->smk_known, GFP_NOFS);
e114e473
CS		 1051 if (*value == NULL)
1052 return -ENOMEM;
e114e473 1053
21c7eae2 1054 *len = strlen(isp->smk_known);
68390ccf 1055 }
e114e473
CS		 1056
1057 return 0;
1058}
1059
1060/**
1061 * smack_inode_link - Smack check on link
1062 * @old_dentry: the existing object
1063 * @dir: unused
1064 * @new_dentry: the new object
1065 *
1066 * Returns 0 if access is permitted, an error code otherwise
1067 */
1068static int smack_inode_link(struct dentry *old_dentry, struct inode *dir,
1069 struct dentry *new_dentry)
1070{
21c7eae2 1071 struct smack_known *isp;
ecfcc53f
EB		 1072 struct smk_audit_info ad;
1073 int rc;
1074
a269434d 1075 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
ecfcc53f 1076 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
e114e473 1077
c6f493d6 1078 isp = smk_of_inode(d_backing_inode(old_dentry));
ecfcc53f 1079 rc = smk_curacc(isp, MAY_WRITE, &ad);
c6f493d6 1080 rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_WRITE, rc);
e114e473 1081
8802565b 1082 if (rc == 0 && d_is_positive(new_dentry)) {
c6f493d6 1083 isp = smk_of_inode(d_backing_inode(new_dentry));
ecfcc53f
EB		 1084 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
1085 rc = smk_curacc(isp, MAY_WRITE, &ad);
c6f493d6 1086 rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_WRITE, rc);
e114e473
CS		 1087 }
1088
1089 return rc;
1090}
1091
1092/**
1093 * smack_inode_unlink - Smack check on inode deletion
1094 * @dir: containing directory object
1095 * @dentry: file to unlink
1096 *
1097 * Returns 0 if current can write the containing directory
1098 * and the object, error code otherwise
1099 */
1100static int smack_inode_unlink(struct inode *dir, struct dentry *dentry)
1101{
c6f493d6 1102 struct inode *ip = d_backing_inode(dentry);
ecfcc53f 1103 struct smk_audit_info ad;
e114e473
CS		 1104 int rc;
1105
a269434d 1106 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
ecfcc53f
EB		 1107 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1108
e114e473
CS		 1109 /*
1110 * You need write access to the thing you're unlinking
1111 */
ecfcc53f 1112 rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad);
d166c802 1113 rc = smk_bu_inode(ip, MAY_WRITE, rc);
ecfcc53f 1114 if (rc == 0) {
e114e473
CS		 1115 /*
1116 * You also need write access to the containing directory
1117 */
cdb56b60 1118 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
ecfcc53f
EB		 1119 smk_ad_setfield_u_fs_inode(&ad, dir);
1120 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
d166c802 1121 rc = smk_bu_inode(dir, MAY_WRITE, rc);
ecfcc53f 1122 }
e114e473
CS		 1123 return rc;
1124}
1125
1126/**
1127 * smack_inode_rmdir - Smack check on directory deletion
1128 * @dir: containing directory object
1129 * @dentry: directory to unlink
1130 *
1131 * Returns 0 if current can write the containing directory
1132 * and the directory, error code otherwise
1133 */
1134static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry)
1135{
ecfcc53f 1136 struct smk_audit_info ad;
e114e473
CS		 1137 int rc;
1138
a269434d 1139 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
ecfcc53f
EB		 1140 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1141
e114e473
CS		 1142 /*
1143 * You need write access to the thing you're removing
1144 */
c6f493d6
DH		 1145 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1146 rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
ecfcc53f 1147 if (rc == 0) {
e114e473
CS		 1148 /*
1149 * You also need write access to the containing directory
1150 */
cdb56b60 1151 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
ecfcc53f
EB		 1152 smk_ad_setfield_u_fs_inode(&ad, dir);
1153 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
d166c802 1154 rc = smk_bu_inode(dir, MAY_WRITE, rc);
ecfcc53f 1155 }
e114e473
CS		 1156
1157 return rc;
1158}
1159
1160/**
1161 * smack_inode_rename - Smack check on rename
e95ef49b
LP		 1162 * @old_inode: unused
1163 * @old_dentry: the old object
1164 * @new_inode: unused
1165 * @new_dentry: the new object
e114e473
CS		 1166 *
1167 * Read and write access is required on both the old and
1168 * new directories.
1169 *
1170 * Returns 0 if access is permitted, an error code otherwise
1171 */
1172static int smack_inode_rename(struct inode *old_inode,
1173 struct dentry *old_dentry,
1174 struct inode *new_inode,
1175 struct dentry *new_dentry)
1176{
1177 int rc;
21c7eae2 1178 struct smack_known *isp;
ecfcc53f
EB		 1179 struct smk_audit_info ad;
1180
a269434d 1181 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
ecfcc53f 1182 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
e114e473 1183
c6f493d6 1184 isp = smk_of_inode(d_backing_inode(old_dentry));
ecfcc53f 1185 rc = smk_curacc(isp, MAY_READWRITE, &ad);
c6f493d6 1186 rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_READWRITE, rc);
e114e473 1187
8802565b 1188 if (rc == 0 && d_is_positive(new_dentry)) {
c6f493d6 1189 isp = smk_of_inode(d_backing_inode(new_dentry));
ecfcc53f
EB		 1190 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
1191 rc = smk_curacc(isp, MAY_READWRITE, &ad);
c6f493d6 1192 rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_READWRITE, rc);
e114e473 1193 }
e114e473
CS		 1194 return rc;
1195}
1196
1197/**
1198 * smack_inode_permission - Smack version of permission()
1199 * @inode: the inode in question
1200 * @mask: the access requested
e114e473
CS		 1201 *
1202 * This is the important Smack hook.
1203 *
1204 * Returns 0 if access is permitted, -EACCES otherwise
1205 */
e74f71eb 1206static int smack_inode_permission(struct inode *inode, int mask)
e114e473 1207{
ecfcc53f 1208 struct smk_audit_info ad;
e74f71eb 1209 int no_block = mask & MAY_NOT_BLOCK;
d166c802 1210 int rc;
d09ca739
EP		 1211
1212 mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND);
e114e473
CS		 1213 /*
1214 * No permission to check. Existence test. Yup, it's there.
1215 */
1216 if (mask == 0)
1217 return 0;
8c9e80ed
AK		 1218
1219 /* May be droppable after audit */
e74f71eb 1220 if (no_block)
8c9e80ed 1221 return -ECHILD;
f48b7399 1222 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
ecfcc53f 1223 smk_ad_setfield_u_fs_inode(&ad, inode);
d166c802
CS		 1224 rc = smk_curacc(smk_of_inode(inode), mask, &ad);
1225 rc = smk_bu_inode(inode, mask, rc);
1226 return rc;
e114e473
CS		 1227}
1228
1229/**
1230 * smack_inode_setattr - Smack check for setting attributes
1231 * @dentry: the object
1232 * @iattr: for the force flag
1233 *
1234 * Returns 0 if access is permitted, an error code otherwise
1235 */
1236static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr)
1237{
ecfcc53f 1238 struct smk_audit_info ad;
d166c802
CS		 1239 int rc;
1240
e114e473
CS		 1241 /*
1242 * Need to allow for clearing the setuid bit.
1243 */
1244 if (iattr->ia_valid & ATTR_FORCE)
1245 return 0;
a269434d 1246 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
ecfcc53f 1247 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
e114e473 1248
c6f493d6
DH		 1249 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1250 rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
d166c802 1251 return rc;
e114e473
CS		 1252}
1253
1254/**
1255 * smack_inode_getattr - Smack check for getting attributes
e95ef49b 1256 * @mnt: vfsmount of the object
e114e473
CS		 1257 * @dentry: the object
1258 *
1259 * Returns 0 if access is permitted, an error code otherwise
1260 */
3f7036a0 1261static int smack_inode_getattr(const struct path *path)
e114e473 1262{
ecfcc53f 1263 struct smk_audit_info ad;
c6f493d6 1264 struct inode *inode = d_backing_inode(path->dentry);
d166c802 1265 int rc;
ecfcc53f 1266
f48b7399 1267 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
3f7036a0
AV		 1268 smk_ad_setfield_u_fs_path(&ad, *path);
1269 rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad);
1270 rc = smk_bu_inode(inode, MAY_READ, rc);
d166c802 1271 return rc;
e114e473
CS		 1272}
1273
1274/**
1275 * smack_inode_setxattr - Smack check for setting xattrs
1276 * @dentry: the object
1277 * @name: name of the attribute
e95ef49b
LP		 1278 * @value: value of the attribute
1279 * @size: size of the value
e114e473
CS		 1280 * @flags: unused
1281 *
1282 * This protects the Smack attribute explicitly.
1283 *
1284 * Returns 0 if access is permitted, an error code otherwise
1285 */
8f0cfa52
DH		 1286static int smack_inode_setxattr(struct dentry *dentry, const char *name,
1287 const void *value, size_t size, int flags)
e114e473 1288{
ecfcc53f 1289 struct smk_audit_info ad;
19760ad0
CS		 1290 struct smack_known *skp;
1291 int check_priv = 0;
1292 int check_import = 0;
1293 int check_star = 0;
bcdca225 1294 int rc = 0;
e114e473 1295
19760ad0
CS		 1296 /*
1297 * Check label validity here so import won't fail in post_setxattr
1298 */
bcdca225
CS		 1299 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
1300 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
19760ad0
CS		 1301 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) {
1302 check_priv = 1;
1303 check_import = 1;
1304 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
1305 strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
1306 check_priv = 1;
1307 check_import = 1;
1308 check_star = 1;
5c6d1125 1309 } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
19760ad0 1310 check_priv = 1;
5c6d1125
JS		 1311 if (size != TRANS_TRUE_SIZE ||
1312 strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0)
1313 rc = -EINVAL;
bcdca225
CS		 1314 } else
1315 rc = cap_inode_setxattr(dentry, name, value, size, flags);
1316
19760ad0
CS		 1317 if (check_priv && !smack_privileged(CAP_MAC_ADMIN))
1318 rc = -EPERM;
1319
1320 if (rc == 0 && check_import) {
b862e561 1321 skp = size ? smk_import_entry(value, size) : NULL;
e774ad68
LP		 1322 if (IS_ERR(skp))
1323 rc = PTR_ERR(skp);
1324 else if (skp == NULL || (check_star &&
19760ad0
CS		 1325 (skp == &smack_known_star || skp == &smack_known_web)))
1326 rc = -EINVAL;
1327 }
1328
a269434d 1329 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
ecfcc53f
EB		 1330 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1331
d166c802 1332 if (rc == 0) {
c6f493d6
DH		 1333 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1334 rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
d166c802 1335 }
bcdca225
CS		 1336
1337 return rc;
e114e473
CS		 1338}
1339
1340/**
1341 * smack_inode_post_setxattr - Apply the Smack update approved above
1342 * @dentry: object
1343 * @name: attribute name
1344 * @value: attribute value
1345 * @size: attribute size
1346 * @flags: unused
1347 *
1348 * Set the pointer in the inode blob to the entry found
1349 * in the master label list.
1350 */
8f0cfa52
DH		 1351static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
1352 const void *value, size_t size, int flags)
e114e473 1353{
2f823ff8 1354 struct smack_known *skp;
c6f493d6 1355 struct inode_smack *isp = d_backing_inode(dentry)->i_security;
676dac4b 1356
2f823ff8
CS		 1357 if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
1358 isp->smk_flags |= SMK_INODE_TRANSMUTE;
1359 return;
1360 }
1361
676dac4b 1362 if (strcmp(name, XATTR_NAME_SMACK) == 0) {
9598f4c9 1363 skp = smk_import_entry(value, size);
e774ad68 1364 if (!IS_ERR(skp))
21c7eae2 1365 isp->smk_inode = skp;
676dac4b 1366 else
21c7eae2 1367 isp->smk_inode = &smack_known_invalid;
5c6d1125 1368 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) {
9598f4c9 1369 skp = smk_import_entry(value, size);
e774ad68 1370 if (!IS_ERR(skp))
2f823ff8 1371 isp->smk_task = skp;
676dac4b 1372 else
2f823ff8 1373 isp->smk_task = &smack_known_invalid;
7898e1f8 1374 } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
9598f4c9 1375 skp = smk_import_entry(value, size);
e774ad68 1376 if (!IS_ERR(skp))
2f823ff8 1377 isp->smk_mmap = skp;
7898e1f8 1378 else
2f823ff8
CS		 1379 isp->smk_mmap = &smack_known_invalid;
1380 }
e114e473
CS		 1381
1382 return;
1383}
1384
ce8a4321 1385/**
e114e473
CS		 1386 * smack_inode_getxattr - Smack check on getxattr
1387 * @dentry: the object
1388 * @name: unused
1389 *
1390 * Returns 0 if access is permitted, an error code otherwise
1391 */
8f0cfa52 1392static int smack_inode_getxattr(struct dentry *dentry, const char *name)
e114e473 1393{
ecfcc53f 1394 struct smk_audit_info ad;
d166c802 1395 int rc;
ecfcc53f 1396
a269434d 1397 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
ecfcc53f
EB		 1398 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1399
c6f493d6
DH		 1400 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_READ, &ad);
1401 rc = smk_bu_inode(d_backing_inode(dentry), MAY_READ, rc);
d166c802 1402 return rc;
e114e473
CS		 1403}
1404
ce8a4321 1405/**
e114e473
CS		 1406 * smack_inode_removexattr - Smack check on removexattr
1407 * @dentry: the object
1408 * @name: name of the attribute
1409 *
1410 * Removing the Smack attribute requires CAP_MAC_ADMIN
1411 *
1412 * Returns 0 if access is permitted, an error code otherwise
1413 */
8f0cfa52 1414static int smack_inode_removexattr(struct dentry *dentry, const char *name)
e114e473 1415{
676dac4b 1416 struct inode_smack *isp;
ecfcc53f 1417 struct smk_audit_info ad;
bcdca225 1418 int rc = 0;
e114e473 1419
bcdca225
CS		 1420 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
1421 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
676dac4b 1422 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
5c6d1125 1423 strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
7898e1f8 1424 strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 ||
5e9ab593 1425 strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
1880eff7 1426 if (!smack_privileged(CAP_MAC_ADMIN))
bcdca225
CS		 1427 rc = -EPERM;
1428 } else
1429 rc = cap_inode_removexattr(dentry, name);
1430
f59bdfba
CS		 1431 if (rc != 0)
1432 return rc;
1433
a269434d 1434 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
ecfcc53f 1435 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
bcdca225 1436
c6f493d6
DH		 1437 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1438 rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
f59bdfba
CS		 1439 if (rc != 0)
1440 return rc;
1441
c6f493d6 1442 isp = d_backing_inode(dentry)->i_security;
f59bdfba
CS		 1443 /*
1444 * Don't do anything special for these.
1445 * XATTR_NAME_SMACKIPIN
1446 * XATTR_NAME_SMACKIPOUT
1447 * XATTR_NAME_SMACKEXEC
1448 */
1449 if (strcmp(name, XATTR_NAME_SMACK) == 0)
676dac4b 1450 isp->smk_task = NULL;
f59bdfba 1451 else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0)
7898e1f8 1452 isp->smk_mmap = NULL;
f59bdfba
CS		 1453 else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0)
1454 isp->smk_flags &= ~SMK_INODE_TRANSMUTE;
676dac4b 1455
f59bdfba 1456 return 0;
e114e473
CS		 1457}
1458
1459/**
1460 * smack_inode_getsecurity - get smack xattrs
1461 * @inode: the object
1462 * @name: attribute name
1463 * @buffer: where to put the result
251a2a95 1464 * @alloc: unused
e114e473
CS		 1465 *
1466 * Returns the size of the attribute or an error code
1467 */
1468static int smack_inode_getsecurity(const struct inode *inode,
1469 const char *name, void **buffer,
1470 bool alloc)
1471{
1472 struct socket_smack *ssp;
1473 struct socket *sock;
1474 struct super_block *sbp;
1475 struct inode *ip = (struct inode *)inode;
21c7eae2 1476 struct smack_known *isp;
e114e473
CS		 1477 int ilen;
1478 int rc = 0;
1479
1480 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
1481 isp = smk_of_inode(inode);
21c7eae2
LP		 1482 ilen = strlen(isp->smk_known);
1483 *buffer = isp->smk_known;
e114e473
CS		 1484 return ilen;
1485 }
1486
1487 /*
1488 * The rest of the Smack xattrs are only on sockets.
1489 */
1490 sbp = ip->i_sb;
1491 if (sbp->s_magic != SOCKFS_MAGIC)
1492 return -EOPNOTSUPP;
1493
1494 sock = SOCKET_I(ip);
2e1d146a 1495 if (sock == NULL || sock->sk == NULL)
e114e473
CS		 1496 return -EOPNOTSUPP;
1497
1498 ssp = sock->sk->sk_security;
1499
1500 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
21c7eae2 1501 isp = ssp->smk_in;
e114e473 1502 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0)
21c7eae2 1503 isp = ssp->smk_out;
e114e473
CS		 1504 else
1505 return -EOPNOTSUPP;
1506
21c7eae2 1507 ilen = strlen(isp->smk_known);
e114e473 1508 if (rc == 0) {
21c7eae2 1509 *buffer = isp->smk_known;
e114e473
CS		 1510 rc = ilen;
1511 }
1512
1513 return rc;
1514}
1515
1516
1517/**
1518 * smack_inode_listsecurity - list the Smack attributes
1519 * @inode: the object
1520 * @buffer: where they go
1521 * @buffer_size: size of buffer
1522 *
1523 * Returns 0 on success, -EINVAL otherwise
1524 */
1525static int smack_inode_listsecurity(struct inode *inode, char *buffer,
1526 size_t buffer_size)
1527{
fd5c9d23 1528 int len = sizeof(XATTR_NAME_SMACK);
e114e473 1529
fd5c9d23 1530 if (buffer != NULL && len <= buffer_size)
e114e473 1531 memcpy(buffer, XATTR_NAME_SMACK, len);
fd5c9d23
KK		 1532
1533 return len;
e114e473
CS		 1534}
1535
d20bdda6
AD		 1536/**
1537 * smack_inode_getsecid - Extract inode's security id
1538 * @inode: inode to extract the info from
1539 * @secid: where result will be saved
1540 */
1541static void smack_inode_getsecid(const struct inode *inode, u32 *secid)
1542{
1543 struct inode_smack *isp = inode->i_security;
1544
21c7eae2 1545 *secid = isp->smk_inode->smk_secid;
d20bdda6
AD		 1546}
1547
e114e473
CS		 1548/*
1549 * File Hooks
1550 */
1551
1552/**
1553 * smack_file_permission - Smack check on file operations
1554 * @file: unused
1555 * @mask: unused
1556 *
1557 * Returns 0
1558 *
1559 * Should access checks be done on each read or write?
1560 * UNICOS and SELinux say yes.
1561 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
1562 *
1563 * I'll say no for now. Smack does not do the frequent
1564 * label changing that SELinux does.
1565 */
1566static int smack_file_permission(struct file *file, int mask)
1567{
1568 return 0;
1569}
1570
1571/**
1572 * smack_file_alloc_security - assign a file security blob
1573 * @file: the object
1574 *
1575 * The security blob for a file is a pointer to the master
1576 * label list, so no allocation is done.
1577 *
5e7270a6
CS		 1578 * f_security is the owner security information. It
1579 * isn't used on file access checks, it's for send_sigio.
1580 *
e114e473
CS		 1581 * Returns 0
1582 */
1583static int smack_file_alloc_security(struct file *file)
1584{
2f823ff8
CS		 1585 struct smack_known *skp = smk_of_current();
1586
21c7eae2 1587 file->f_security = skp;
e114e473
CS		 1588 return 0;
1589}
1590
1591/**
1592 * smack_file_free_security - clear a file security blob
1593 * @file: the object
1594 *
1595 * The security blob for a file is a pointer to the master
1596 * label list, so no memory is freed.
1597 */
1598static void smack_file_free_security(struct file *file)
1599{
1600 file->f_security = NULL;
1601}
1602
1603/**
1604 * smack_file_ioctl - Smack check on ioctls
1605 * @file: the object
1606 * @cmd: what to do
1607 * @arg: unused
1608 *
1609 * Relies heavily on the correct use of the ioctl command conventions.
1610 *
1611 * Returns 0 if allowed, error code otherwise
1612 */
1613static int smack_file_ioctl(struct file *file, unsigned int cmd,
1614 unsigned long arg)
1615{
1616 int rc = 0;
ecfcc53f 1617 struct smk_audit_info ad;
5e7270a6 1618 struct inode *inode = file_inode(file);
ecfcc53f 1619
f48b7399 1620 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
ecfcc53f 1621 smk_ad_setfield_u_fs_path(&ad, file->f_path);
e114e473 1622
d166c802 1623 if (_IOC_DIR(cmd) & _IOC_WRITE) {
5e7270a6 1624 rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad);
d166c802
CS		 1625 rc = smk_bu_file(file, MAY_WRITE, rc);
1626 }
e114e473 1627
d166c802 1628 if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) {
5e7270a6 1629 rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad);
d166c802
CS		 1630 rc = smk_bu_file(file, MAY_READ, rc);
1631 }
e114e473
CS		 1632
1633 return rc;
1634}
1635
1636/**
1637 * smack_file_lock - Smack check on file locking
1638 * @file: the object
251a2a95 1639 * @cmd: unused
e114e473 1640 *
c0ab6e56 1641 * Returns 0 if current has lock access, error code otherwise
e114e473
CS		 1642 */
1643static int smack_file_lock(struct file *file, unsigned int cmd)
1644{
ecfcc53f 1645 struct smk_audit_info ad;
d166c802 1646 int rc;
5e7270a6 1647 struct inode *inode = file_inode(file);
ecfcc53f 1648
92f42509
EP		 1649 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1650 smk_ad_setfield_u_fs_path(&ad, file->f_path);
5e7270a6 1651 rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad);
d166c802
CS		 1652 rc = smk_bu_file(file, MAY_LOCK, rc);
1653 return rc;
e114e473
CS		 1654}
1655
1656/**
1657 * smack_file_fcntl - Smack check on fcntl
1658 * @file: the object
1659 * @cmd: what action to check
1660 * @arg: unused
1661 *
531f1d45
CS		 1662 * Generally these operations are harmless.
1663 * File locking operations present an obvious mechanism
1664 * for passing information, so they require write access.
1665 *
e114e473
CS		 1666 * Returns 0 if current has access, error code otherwise
1667 */
1668static int smack_file_fcntl(struct file *file, unsigned int cmd,
1669 unsigned long arg)
1670{
ecfcc53f 1671 struct smk_audit_info ad;
531f1d45 1672 int rc = 0;
5e7270a6 1673 struct inode *inode = file_inode(file);
ecfcc53f 1674
e114e473 1675 switch (cmd) {
e114e473 1676 case F_GETLK:
c0ab6e56 1677 break;
e114e473
CS		 1678 case F_SETLK:
1679 case F_SETLKW:
c0ab6e56
CS		 1680 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1681 smk_ad_setfield_u_fs_path(&ad, file->f_path);
5e7270a6 1682 rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad);
d166c802 1683 rc = smk_bu_file(file, MAY_LOCK, rc);
c0ab6e56 1684 break;
e114e473
CS		 1685 case F_SETOWN:
1686 case F_SETSIG:
531f1d45
CS		 1687 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1688 smk_ad_setfield_u_fs_path(&ad, file->f_path);
5e7270a6 1689 rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad);
d166c802 1690 rc = smk_bu_file(file, MAY_WRITE, rc);
e114e473
CS		 1691 break;
1692 default:
531f1d45 1693 break;
e114e473
CS		 1694 }
1695
1696 return rc;
1697}
1698
7898e1f8 1699/**
e5467859 1700 * smack_mmap_file :
7898e1f8
CS		 1701 * Check permissions for a mmap operation. The @file may be NULL, e.g.
1702 * if mapping anonymous memory.
1703 * @file contains the file structure for file to map (may be NULL).
1704 * @reqprot contains the protection requested by the application.
1705 * @prot contains the protection that will be applied by the kernel.
1706 * @flags contains the operational flags.
1707 * Return 0 if permission is granted.
1708 */
e5467859 1709static int smack_mmap_file(struct file *file,
7898e1f8 1710 unsigned long reqprot, unsigned long prot,
e5467859 1711 unsigned long flags)
7898e1f8 1712{
272cd7a8 1713 struct smack_known *skp;
2f823ff8 1714 struct smack_known *mkp;
7898e1f8
CS		 1715 struct smack_rule *srp;
1716 struct task_smack *tsp;
21c7eae2 1717 struct smack_known *okp;
7898e1f8 1718 struct inode_smack *isp;
0e0a070d
CS		 1719 int may;
1720 int mmay;
1721 int tmay;
7898e1f8
CS		 1722 int rc;
1723
496ad9aa 1724 if (file == NULL)
7898e1f8
CS		 1725 return 0;
1726
496ad9aa 1727 isp = file_inode(file)->i_security;
7898e1f8
CS		 1728 if (isp->smk_mmap == NULL)
1729 return 0;
2f823ff8 1730 mkp = isp->smk_mmap;
7898e1f8
CS		 1731
1732 tsp = current_security();
2f823ff8 1733 skp = smk_of_current();
7898e1f8
CS		 1734 rc = 0;
1735
1736 rcu_read_lock();
1737 /*
1738 * For each Smack rule associated with the subject
1739 * label verify that the SMACK64MMAP also has access
1740 * to that rule's object label.
7898e1f8 1741 */
272cd7a8 1742 list_for_each_entry_rcu(srp, &skp->smk_rules, list) {
21c7eae2 1743 okp = srp->smk_object;
7898e1f8
CS		 1744 /*
1745 * Matching labels always allows access.
1746 */
21c7eae2 1747 if (mkp->smk_known == okp->smk_known)
7898e1f8 1748 continue;
0e0a070d
CS		 1749 /*
1750 * If there is a matching local rule take
1751 * that into account as well.
1752 */
21c7eae2
LP		 1753 may = smk_access_entry(srp->smk_subject->smk_known,
1754 okp->smk_known,
1755 &tsp->smk_rules);
0e0a070d
CS		 1756 if (may == -ENOENT)
1757 may = srp->smk_access;
1758 else
1759 may &= srp->smk_access;
1760 /*
1761 * If may is zero the SMACK64MMAP subject can't
1762 * possibly have less access.
1763 */
1764 if (may == 0)
1765 continue;
1766
1767 /*
1768 * Fetch the global list entry.
1769 * If there isn't one a SMACK64MMAP subject
1770 * can't have as much access as current.
1771 */
21c7eae2
LP		 1772 mmay = smk_access_entry(mkp->smk_known, okp->smk_known,
1773 &mkp->smk_rules);
0e0a070d
CS		 1774 if (mmay == -ENOENT) {
1775 rc = -EACCES;
1776 break;
1777 }
1778 /*
1779 * If there is a local entry it modifies the
1780 * potential access, too.
1781 */
21c7eae2
LP		 1782 tmay = smk_access_entry(mkp->smk_known, okp->smk_known,
1783 &tsp->smk_rules);
0e0a070d
CS		 1784 if (tmay != -ENOENT)
1785 mmay &= tmay;
7898e1f8 1786
0e0a070d
CS		 1787 /*
1788 * If there is any access available to current that is
1789 * not available to a SMACK64MMAP subject
1790 * deny access.
1791 */
75a25637 1792 if ((may | mmay) != mmay) {
0e0a070d 1793 rc = -EACCES;
7898e1f8 1794 break;
0e0a070d 1795 }
7898e1f8
CS		 1796 }
1797
1798 rcu_read_unlock();
1799
1800 return rc;
1801}
1802
e114e473
CS		 1803/**
1804 * smack_file_set_fowner - set the file security blob value
1805 * @file: object in question
1806 *
e114e473 1807 */
e0b93edd 1808static void smack_file_set_fowner(struct file *file)
e114e473 1809{
5e7270a6 1810 file->f_security = smk_of_current();
e114e473
CS		 1811}
1812
1813/**
1814 * smack_file_send_sigiotask - Smack on sigio
1815 * @tsk: The target task
1816 * @fown: the object the signal come from
1817 * @signum: unused
1818 *
1819 * Allow a privileged task to get signals even if it shouldn't
1820 *
1821 * Returns 0 if a subject with the object's smack could
1822 * write to the task, an error code otherwise.
1823 */
1824static int smack_file_send_sigiotask(struct task_struct *tsk,
1825 struct fown_struct *fown, int signum)
1826{
2f823ff8
CS		 1827 struct smack_known *skp;
1828 struct smack_known *tkp = smk_of_task(tsk->cred->security);
e114e473
CS		 1829 struct file *file;
1830 int rc;
ecfcc53f 1831 struct smk_audit_info ad;
e114e473
CS		 1832
1833 /*
1834 * struct fown_struct is never outside the context of a struct file
1835 */
1836 file = container_of(fown, struct file, f_owner);
7898e1f8 1837
ecfcc53f 1838 /* we don't log here as rc can be overriden */
21c7eae2
LP		 1839 skp = file->f_security;
1840 rc = smk_access(skp, tkp, MAY_WRITE, NULL);
1841 rc = smk_bu_note("sigiotask", skp, tkp, MAY_WRITE, rc);
5cd9c58f 1842 if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE))
ecfcc53f
EB		 1843 rc = 0;
1844
1845 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1846 smk_ad_setfield_u_tsk(&ad, tsk);
21c7eae2 1847 smack_log(skp->smk_known, tkp->smk_known, MAY_WRITE, rc, &ad);
e114e473
CS		 1848 return rc;
1849}
1850
1851/**
1852 * smack_file_receive - Smack file receive check
1853 * @file: the object
1854 *
1855 * Returns 0 if current has access, error code otherwise
1856 */
1857static int smack_file_receive(struct file *file)
1858{
d166c802 1859 int rc;
e114e473 1860 int may = 0;
ecfcc53f 1861 struct smk_audit_info ad;
5e7270a6 1862 struct inode *inode = file_inode(file);
e114e473 1863
9777582e
SWK		 1864 if (unlikely(IS_PRIVATE(inode)))
1865 return 0;
1866
4482a44f 1867 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
ecfcc53f 1868 smk_ad_setfield_u_fs_path(&ad, file->f_path);
e114e473
CS		 1869 /*
1870 * This code relies on bitmasks.
1871 */
1872 if (file->f_mode & FMODE_READ)
1873 may = MAY_READ;
1874 if (file->f_mode & FMODE_WRITE)
1875 may |= MAY_WRITE;
1876
5e7270a6 1877 rc = smk_curacc(smk_of_inode(inode), may, &ad);
d166c802
CS		 1878 rc = smk_bu_file(file, may, rc);
1879 return rc;
e114e473
CS		 1880}
1881
531f1d45 1882/**
83d49856 1883 * smack_file_open - Smack dentry open processing
531f1d45 1884 * @file: the object
a6834c0b 1885 * @cred: task credential
531f1d45
CS		 1886 *
1887 * Set the security blob in the file structure.
a6834c0b
CS		 1888 * Allow the open only if the task has read access. There are
1889 * many read operations (e.g. fstat) that you can do with an
1890 * fd even if you have the file open write-only.
531f1d45
CS		 1891 *
1892 * Returns 0
1893 */
83d49856 1894static int smack_file_open(struct file *file, const struct cred *cred)
531f1d45 1895{
a6834c0b 1896 struct task_smack *tsp = cred->security;
5e7270a6 1897 struct inode *inode = file_inode(file);
a6834c0b
CS		 1898 struct smk_audit_info ad;
1899 int rc;
531f1d45 1900
5e7270a6 1901 if (smack_privileged(CAP_MAC_OVERRIDE))
a6834c0b 1902 return 0;
531f1d45 1903
a6834c0b
CS		 1904 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1905 smk_ad_setfield_u_fs_path(&ad, file->f_path);
5e7270a6 1906 rc = smk_access(tsp->smk_task, smk_of_inode(inode), MAY_READ, &ad);
d166c802 1907 rc = smk_bu_credfile(cred, file, MAY_READ, rc);
a6834c0b
CS		 1908
1909 return rc;
531f1d45
CS		 1910}
1911
e114e473
CS		 1912/*
1913 * Task hooks
1914 */
1915
ee18d64c
DH		 1916/**
1917 * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1918 * @new: the new credentials
1919 * @gfp: the atomicity of any memory allocations
1920 *
1921 * Prepare a blank set of credentials for modification. This must allocate all
1922 * the memory the LSM module might require such that cred_transfer() can
1923 * complete without error.
1924 */
1925static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp)
1926{
7898e1f8
CS		 1927 struct task_smack *tsp;
1928
1929 tsp = new_task_smack(NULL, NULL, gfp);
1930 if (tsp == NULL)
676dac4b 1931 return -ENOMEM;
7898e1f8
CS		 1932
1933 cred->security = tsp;
1934
ee18d64c
DH		 1935 return 0;
1936}
1937
1938
e114e473 1939/**
f1752eec
DH		 1940 * smack_cred_free - "free" task-level security credentials
1941 * @cred: the credentials in question
e114e473 1942 *
e114e473 1943 */
f1752eec 1944static void smack_cred_free(struct cred *cred)
e114e473 1945{
7898e1f8
CS		 1946 struct task_smack *tsp = cred->security;
1947 struct smack_rule *rp;
1948 struct list_head *l;
1949 struct list_head *n;
1950
1951 if (tsp == NULL)
1952 return;
1953 cred->security = NULL;
1954
38416e53
ZJ		 1955 smk_destroy_label_list(&tsp->smk_relabel);
1956
7898e1f8
CS		 1957 list_for_each_safe(l, n, &tsp->smk_rules) {
1958 rp = list_entry(l, struct smack_rule, list);
1959 list_del(&rp->list);
1960 kfree(rp);
1961 }
1962 kfree(tsp);
e114e473
CS		 1963}
1964
d84f4f99
DH		 1965/**
1966 * smack_cred_prepare - prepare new set of credentials for modification
1967 * @new: the new credentials
1968 * @old: the original credentials
1969 * @gfp: the atomicity of any memory allocations
1970 *
1971 * Prepare a new set of credentials for modification.
1972 */
1973static int smack_cred_prepare(struct cred *new, const struct cred *old,
1974 gfp_t gfp)
1975{
676dac4b
CS		 1976 struct task_smack *old_tsp = old->security;
1977 struct task_smack *new_tsp;
7898e1f8 1978 int rc;
676dac4b 1979
7898e1f8 1980 new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp);
676dac4b
CS		 1981 if (new_tsp == NULL)
1982 return -ENOMEM;
1983
7898e1f8
CS		 1984 rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp);
1985 if (rc != 0)
1986 return rc;
1987
38416e53
ZJ		 1988 rc = smk_copy_relabel(&new_tsp->smk_relabel, &old_tsp->smk_relabel,
1989 gfp);
1990 if (rc != 0)
1991 return rc;
1992
676dac4b 1993 new->security = new_tsp;
d84f4f99
DH		 1994 return 0;
1995}
1996
ee18d64c
DH		 1997/**
1998 * smack_cred_transfer - Transfer the old credentials to the new credentials
1999 * @new: the new credentials
2000 * @old: the original credentials
2001 *
2002 * Fill in a set of blank credentials from another set of credentials.
2003 */
2004static void smack_cred_transfer(struct cred *new, const struct cred *old)
2005{
676dac4b
CS		 2006 struct task_smack *old_tsp = old->security;
2007 struct task_smack *new_tsp = new->security;
2008
2009 new_tsp->smk_task = old_tsp->smk_task;
2010 new_tsp->smk_forked = old_tsp->smk_task;
7898e1f8
CS		 2011 mutex_init(&new_tsp->smk_rules_lock);
2012 INIT_LIST_HEAD(&new_tsp->smk_rules);
2013
2014
2015 /* cbs copy rule list */
ee18d64c
DH		 2016}
2017
3a3b7ce9
DH		 2018/**
2019 * smack_kernel_act_as - Set the subjective context in a set of credentials
251a2a95
RD		 2020 * @new: points to the set of credentials to be modified.
2021 * @secid: specifies the security ID to be set
3a3b7ce9
DH		 2022 *
2023 * Set the security data for a kernel service.
2024 */
2025static int smack_kernel_act_as(struct cred *new, u32 secid)
2026{
676dac4b 2027 struct task_smack *new_tsp = new->security;
2f823ff8 2028 struct smack_known *skp = smack_from_secid(secid);
3a3b7ce9 2029
2f823ff8 2030 if (skp == NULL)
3a3b7ce9
DH		 2031 return -EINVAL;
2032
2f823ff8 2033 new_tsp->smk_task = skp;
3a3b7ce9
DH		 2034 return 0;
2035}
2036
2037/**
2038 * smack_kernel_create_files_as - Set the file creation label in a set of creds
251a2a95
RD		 2039 * @new: points to the set of credentials to be modified
2040 * @inode: points to the inode to use as a reference
3a3b7ce9
DH		 2041 *
2042 * Set the file creation context in a set of credentials to the same
2043 * as the objective context of the specified inode
2044 */
2045static int smack_kernel_create_files_as(struct cred *new,
2046 struct inode *inode)
2047{
2048 struct inode_smack *isp = inode->i_security;
676dac4b 2049 struct task_smack *tsp = new->security;
3a3b7ce9 2050
21c7eae2 2051 tsp->smk_forked = isp->smk_inode;
2f823ff8 2052 tsp->smk_task = tsp->smk_forked;
3a3b7ce9
DH		 2053 return 0;
2054}
2055
ecfcc53f
EB		 2056/**
2057 * smk_curacc_on_task - helper to log task related access
2058 * @p: the task object
531f1d45
CS		 2059 * @access: the access requested
2060 * @caller: name of the calling function for audit
ecfcc53f
EB		 2061 *
2062 * Return 0 if access is permitted
2063 */
531f1d45
CS		 2064static int smk_curacc_on_task(struct task_struct *p, int access,
2065 const char *caller)
ecfcc53f
EB		 2066{
2067 struct smk_audit_info ad;
6d1cff2a 2068 struct smack_known *skp = smk_of_task_struct(p);
d166c802 2069 int rc;
ecfcc53f 2070
531f1d45 2071 smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK);
ecfcc53f 2072 smk_ad_setfield_u_tsk(&ad, p);
21c7eae2 2073 rc = smk_curacc(skp, access, &ad);
d166c802
CS		 2074 rc = smk_bu_task(p, access, rc);
2075 return rc;
ecfcc53f
EB		 2076}
2077
e114e473
CS		 2078/**
2079 * smack_task_setpgid - Smack check on setting pgid
2080 * @p: the task object
2081 * @pgid: unused
2082 *
2083 * Return 0 if write access is permitted
2084 */
2085static int smack_task_setpgid(struct task_struct *p, pid_t pgid)
2086{
531f1d45 2087 return smk_curacc_on_task(p, MAY_WRITE, __func__);
e114e473
CS		 2088}
2089
2090/**
2091 * smack_task_getpgid - Smack access check for getpgid
2092 * @p: the object task
2093 *
2094 * Returns 0 if current can read the object task, error code otherwise
2095 */
2096static int smack_task_getpgid(struct task_struct *p)
2097{
531f1d45 2098 return smk_curacc_on_task(p, MAY_READ, __func__);
e114e473
CS		 2099}
2100
2101/**
2102 * smack_task_getsid - Smack access check for getsid
2103 * @p: the object task
2104 *
2105 * Returns 0 if current can read the object task, error code otherwise
2106 */
2107static int smack_task_getsid(struct task_struct *p)
2108{
531f1d45 2109 return smk_curacc_on_task(p, MAY_READ, __func__);
e114e473
CS		 2110}
2111
2112/**
2113 * smack_task_getsecid - get the secid of the task
2114 * @p: the object task
2115 * @secid: where to put the result
2116 *
2117 * Sets the secid to contain a u32 version of the smack label.
2118 */
2119static void smack_task_getsecid(struct task_struct *p, u32 *secid)
2120{
6d1cff2a 2121 struct smack_known *skp = smk_of_task_struct(p);
2f823ff8
CS		 2122
2123 *secid = skp->smk_secid;
e114e473
CS		 2124}
2125
2126/**
2127 * smack_task_setnice - Smack check on setting nice
2128 * @p: the task object
2129 * @nice: unused
2130 *
2131 * Return 0 if write access is permitted
2132 */
2133static int smack_task_setnice(struct task_struct *p, int nice)
2134{
b1d9e6b0 2135 return smk_curacc_on_task(p, MAY_WRITE, __func__);
e114e473
CS		 2136}
2137
2138/**
2139 * smack_task_setioprio - Smack check on setting ioprio
2140 * @p: the task object
2141 * @ioprio: unused
2142 *
2143 * Return 0 if write access is permitted
2144 */
2145static int smack_task_setioprio(struct task_struct *p, int ioprio)
2146{
b1d9e6b0 2147 return smk_curacc_on_task(p, MAY_WRITE, __func__);
e114e473
CS		 2148}
2149
2150/**
2151 * smack_task_getioprio - Smack check on reading ioprio
2152 * @p: the task object
2153 *
2154 * Return 0 if read access is permitted
2155 */
2156static int smack_task_getioprio(struct task_struct *p)
2157{
531f1d45 2158 return smk_curacc_on_task(p, MAY_READ, __func__);
e114e473
CS		 2159}
2160
2161/**
2162 * smack_task_setscheduler - Smack check on setting scheduler
2163 * @p: the task object
2164 * @policy: unused
2165 * @lp: unused
2166 *
2167 * Return 0 if read access is permitted
2168 */
b0ae1981 2169static int smack_task_setscheduler(struct task_struct *p)
e114e473 2170{
b1d9e6b0 2171 return smk_curacc_on_task(p, MAY_WRITE, __func__);
e114e473
CS		 2172}
2173
2174/**
2175 * smack_task_getscheduler - Smack check on reading scheduler
2176 * @p: the task object
2177 *
2178 * Return 0 if read access is permitted
2179 */
2180static int smack_task_getscheduler(struct task_struct *p)
2181{
531f1d45 2182 return smk_curacc_on_task(p, MAY_READ, __func__);
e114e473
CS		 2183}
2184
2185/**
2186 * smack_task_movememory - Smack check on moving memory
2187 * @p: the task object
2188 *
2189 * Return 0 if write access is permitted
2190 */
2191static int smack_task_movememory(struct task_struct *p)
2192{
531f1d45 2193 return smk_curacc_on_task(p, MAY_WRITE, __func__);
e114e473
CS		 2194}
2195
2196/**
2197 * smack_task_kill - Smack check on signal delivery
2198 * @p: the task object
2199 * @info: unused
2200 * @sig: unused
2201 * @secid: identifies the smack to use in lieu of current's
2202 *
2203 * Return 0 if write access is permitted
2204 *
2205 * The secid behavior is an artifact of an SELinux hack
2206 * in the USB code. Someday it may go away.
2207 */
2208static int smack_task_kill(struct task_struct *p, struct siginfo *info,
2209 int sig, u32 secid)
2210{
ecfcc53f 2211 struct smk_audit_info ad;
2f823ff8 2212 struct smack_known *skp;
6d1cff2a 2213 struct smack_known *tkp = smk_of_task_struct(p);
d166c802 2214 int rc;
ecfcc53f
EB		 2215
2216 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
2217 smk_ad_setfield_u_tsk(&ad, p);
e114e473
CS		 2218 /*
2219 * Sending a signal requires that the sender
2220 * can write the receiver.
2221 */
d166c802 2222 if (secid == 0) {
21c7eae2 2223 rc = smk_curacc(tkp, MAY_WRITE, &ad);
d166c802
CS		 2224 rc = smk_bu_task(p, MAY_WRITE, rc);
2225 return rc;
2226 }
e114e473
CS		 2227 /*
2228 * If the secid isn't 0 we're dealing with some USB IO
2229 * specific behavior. This is not clean. For one thing
2230 * we can't take privilege into account.
2231 */
2f823ff8 2232 skp = smack_from_secid(secid);
21c7eae2
LP		 2233 rc = smk_access(skp, tkp, MAY_WRITE, &ad);
2234 rc = smk_bu_note("USB signal", skp, tkp, MAY_WRITE, rc);
d166c802 2235 return rc;
e114e473
CS		 2236}
2237
2238/**
2239 * smack_task_wait - Smack access check for waiting
2240 * @p: task to wait for
2241 *
c00bedb3 2242 * Returns 0
e114e473
CS		 2243 */
2244static int smack_task_wait(struct task_struct *p)
2245{
e114e473 2246 /*
c00bedb3
CS		 2247 * Allow the operation to succeed.
2248 * Zombies are bad.
2249 * In userless environments (e.g. phones) programs
2250 * get marked with SMACK64EXEC and even if the parent
2251 * and child shouldn't be talking the parent still
2252 * may expect to know when the child exits.
e114e473 2253 */
c00bedb3 2254 return 0;
e114e473
CS		 2255}
2256
2257/**
2258 * smack_task_to_inode - copy task smack into the inode blob
2259 * @p: task to copy from
251a2a95 2260 * @inode: inode to copy to
e114e473
CS		 2261 *
2262 * Sets the smack pointer in the inode security blob
2263 */
2264static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
2265{
2266 struct inode_smack *isp = inode->i_security;
6d1cff2a 2267 struct smack_known *skp = smk_of_task_struct(p);
2f823ff8 2268
21c7eae2 2269 isp->smk_inode = skp;
e114e473
CS		 2270}
2271
2272/*
2273 * Socket hooks.
2274 */
2275
2276/**
2277 * smack_sk_alloc_security - Allocate a socket blob
2278 * @sk: the socket
2279 * @family: unused
251a2a95 2280 * @gfp_flags: memory allocation flags
e114e473
CS		 2281 *
2282 * Assign Smack pointers to current
2283 *
2284 * Returns 0 on success, -ENOMEM is there's no memory
2285 */
2286static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
2287{
2f823ff8 2288 struct smack_known *skp = smk_of_current();
e114e473
CS		 2289 struct socket_smack *ssp;
2290
2291 ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
2292 if (ssp == NULL)
2293 return -ENOMEM;
2294
54e70ec5 2295 ssp->smk_in = skp;
2f823ff8 2296 ssp->smk_out = skp;
272cd7a8 2297 ssp->smk_packet = NULL;
e114e473
CS		 2298
2299 sk->sk_security = ssp;
2300
2301 return 0;
2302}
2303
2304/**
2305 * smack_sk_free_security - Free a socket blob
2306 * @sk: the socket
2307 *
2308 * Clears the blob pointer
2309 */
2310static void smack_sk_free_security(struct sock *sk)
2311{
2312 kfree(sk->sk_security);
2313}
2314
07feee8f 2315/**
21abb1ec 2316* smack_ipv4host_label - check host based restrictions
07feee8f
PM		 2317* @sip: the object end
2318*
2319* looks for host based access restrictions
2320*
2321* This version will only be appropriate for really small sets of single label
2322* hosts. The caller is responsible for ensuring that the RCU read lock is
2323* taken before calling this function.
2324*
2325* Returns the label of the far end or NULL if it's not special.
2326*/
21abb1ec 2327static struct smack_known *smack_ipv4host_label(struct sockaddr_in *sip)
07feee8f 2328{
21abb1ec 2329 struct smk_net4addr *snp;
07feee8f
PM		 2330 struct in_addr *siap = &sip->sin_addr;
2331
2332 if (siap->s_addr == 0)
2333 return NULL;
2334
21abb1ec
CS		 2335 list_for_each_entry_rcu(snp, &smk_net4addr_list, list)
2336 /*
2337 * we break after finding the first match because
2338 * the list is sorted from longest to shortest mask
2339 * so we have found the most specific match
2340 */
2341 if (snp->smk_host.s_addr ==
2342 (siap->s_addr & snp->smk_mask.s_addr))
2343 return snp->smk_label;
2344
2345 return NULL;
2346}
2347
2348#if IS_ENABLED(CONFIG_IPV6)
2349/*
2350 * smk_ipv6_localhost - Check for local ipv6 host address
2351 * @sip: the address
2352 *
2353 * Returns boolean true if this is the localhost address
2354 */
2355static bool smk_ipv6_localhost(struct sockaddr_in6 *sip)
2356{
2357 __be16 *be16p = (__be16 *)&sip->sin6_addr;
2358 __be32 *be32p = (__be32 *)&sip->sin6_addr;
2359
2360 if (be32p[0] == 0 && be32p[1] == 0 && be32p[2] == 0 && be16p[6] == 0 &&
2361 ntohs(be16p[7]) == 1)
2362 return true;
2363 return false;
2364}
2365
2366/**
2367* smack_ipv6host_label - check host based restrictions
2368* @sip: the object end
2369*
2370* looks for host based access restrictions
2371*
2372* This version will only be appropriate for really small sets of single label
2373* hosts. The caller is responsible for ensuring that the RCU read lock is
2374* taken before calling this function.
2375*
2376* Returns the label of the far end or NULL if it's not special.
2377*/
2378static struct smack_known *smack_ipv6host_label(struct sockaddr_in6 *sip)
2379{
2380 struct smk_net6addr *snp;
2381 struct in6_addr *sap = &sip->sin6_addr;
2382 int i;
2383 int found = 0;
2384
2385 /*
2386 * It's local. Don't look for a host label.
2387 */
2388 if (smk_ipv6_localhost(sip))
2389 return NULL;
2390
2391 list_for_each_entry_rcu(snp, &smk_net6addr_list, list) {
07feee8f
PM		 2392 /*
2393 * we break after finding the first match because
2394 * the list is sorted from longest to shortest mask
2395 * so we have found the most specific match
2396 */
21abb1ec
CS		 2397 for (found = 1, i = 0; i < 8; i++) {
2398 /*
2399 * If the label is NULL the entry has
2400 * been renounced. Ignore it.
2401 */
2402 if (snp->smk_label == NULL)
2403 continue;
2404 if ((sap->s6_addr16[i] & snp->smk_mask.s6_addr16[i]) !=
2405 snp->smk_host.s6_addr16[i]) {
2406 found = 0;
2407 break;
2408 }
4303154e 2409 }
21abb1ec
CS		 2410 if (found)
2411 return snp->smk_label;
2412 }
07feee8f
PM		 2413
2414 return NULL;
2415}
21abb1ec 2416#endif /* CONFIG_IPV6 */
07feee8f 2417
e114e473
CS		 2418/**
2419 * smack_netlabel - Set the secattr on a socket
2420 * @sk: the socket
6d3dc07c 2421 * @labeled: socket label scheme
e114e473
CS		 2422 *
2423 * Convert the outbound smack value (smk_out) to a
2424 * secattr and attach it to the socket.
2425 *
2426 * Returns 0 on success or an error code
2427 */
6d3dc07c 2428static int smack_netlabel(struct sock *sk, int labeled)
e114e473 2429{
f7112e6c 2430 struct smack_known *skp;
07feee8f 2431 struct socket_smack *ssp = sk->sk_security;
6d3dc07c 2432 int rc = 0;
e114e473 2433
6d3dc07c
CS		 2434 /*
2435 * Usually the netlabel code will handle changing the
2436 * packet labeling based on the label.
2437 * The case of a single label host is different, because
2438 * a single label host should never get a labeled packet
2439 * even though the label is usually associated with a packet
2440 * label.
2441 */
2442 local_bh_disable();
2443 bh_lock_sock_nested(sk);
2444
2445 if (ssp->smk_out == smack_net_ambient ||
2446 labeled == SMACK_UNLABELED_SOCKET)
2447 netlbl_sock_delattr(sk);
2448 else {
2f823ff8 2449 skp = ssp->smk_out;
f7112e6c 2450 rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel);
6d3dc07c
CS		 2451 }
2452
2453 bh_unlock_sock(sk);
2454 local_bh_enable();
4bc87e62 2455
e114e473
CS		 2456 return rc;
2457}
2458
07feee8f
PM		 2459/**
2460 * smack_netlbel_send - Set the secattr on a socket and perform access checks
2461 * @sk: the socket
2462 * @sap: the destination address
2463 *
2464 * Set the correct secattr for the given socket based on the destination
2465 * address and perform any outbound access checks needed.
2466 *
2467 * Returns 0 on success or an error code.
2468 *
2469 */
2470static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap)
2471{
2f823ff8 2472 struct smack_known *skp;
07feee8f
PM		 2473 int rc;
2474 int sk_lbl;
21c7eae2 2475 struct smack_known *hkp;
07feee8f 2476 struct socket_smack *ssp = sk->sk_security;
ecfcc53f 2477 struct smk_audit_info ad;
07feee8f
PM		 2478
2479 rcu_read_lock();
21abb1ec 2480 hkp = smack_ipv4host_label(sap);
21c7eae2 2481 if (hkp != NULL) {
ecfcc53f 2482#ifdef CONFIG_AUDIT
923e9a13
KC		 2483 struct lsm_network_audit net;
2484
48c62af6
EP		 2485 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2486 ad.a.u.net->family = sap->sin_family;
2487 ad.a.u.net->dport = sap->sin_port;
2488 ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr;
ecfcc53f 2489#endif
923e9a13 2490 sk_lbl = SMACK_UNLABELED_SOCKET;
2f823ff8 2491 skp = ssp->smk_out;
21c7eae2
LP		 2492 rc = smk_access(skp, hkp, MAY_WRITE, &ad);
2493 rc = smk_bu_note("IPv4 host check", skp, hkp, MAY_WRITE, rc);
07feee8f
PM		 2494 } else {
2495 sk_lbl = SMACK_CIPSO_SOCKET;
2496 rc = 0;
2497 }
2498 rcu_read_unlock();
2499 if (rc != 0)
2500 return rc;
2501
2502 return smack_netlabel(sk, sk_lbl);
2503}
2504
21abb1ec
CS		 2505#if IS_ENABLED(CONFIG_IPV6)
2506/**
2507 * smk_ipv6_check - check Smack access
2508 * @subject: subject Smack label
2509 * @object: object Smack label
2510 * @address: address
2511 * @act: the action being taken
2512 *
2513 * Check an IPv6 access
2514 */
2515static int smk_ipv6_check(struct smack_known *subject,
2516 struct smack_known *object,
2517 struct sockaddr_in6 *address, int act)
2518{
2519#ifdef CONFIG_AUDIT
2520 struct lsm_network_audit net;
2521#endif
2522 struct smk_audit_info ad;
2523 int rc;
2524
2525#ifdef CONFIG_AUDIT
2526 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2527 ad.a.u.net->family = PF_INET6;
2528 ad.a.u.net->dport = ntohs(address->sin6_port);
2529 if (act == SMK_RECEIVING)
2530 ad.a.u.net->v6info.saddr = address->sin6_addr;
2531 else
2532 ad.a.u.net->v6info.daddr = address->sin6_addr;
2533#endif
2534 rc = smk_access(subject, object, MAY_WRITE, &ad);
2535 rc = smk_bu_note("IPv6 check", subject, object, MAY_WRITE, rc);
2536 return rc;
2537}
2538#endif /* CONFIG_IPV6 */
2539
2540#ifdef SMACK_IPV6_PORT_LABELING
c6739443
CS		 2541/**
2542 * smk_ipv6_port_label - Smack port access table management
2543 * @sock: socket
2544 * @address: address
2545 *
2546 * Create or update the port list entry
2547 */
2548static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address)
2549{
2550 struct sock *sk = sock->sk;
2551 struct sockaddr_in6 *addr6;
2552 struct socket_smack *ssp = sock->sk->sk_security;
2553 struct smk_port_label *spp;
2554 unsigned short port = 0;
2555
2556 if (address == NULL) {
2557 /*
2558 * This operation is changing the Smack information
2559 * on the bound socket. Take the changes to the port
2560 * as well.
2561 */
2562 list_for_each_entry(spp, &smk_ipv6_port_list, list) {
2563 if (sk != spp->smk_sock)
2564 continue;
2565 spp->smk_in = ssp->smk_in;
2566 spp->smk_out = ssp->smk_out;
2567 return;
2568 }
2569 /*
2570 * A NULL address is only used for updating existing
2571 * bound entries. If there isn't one, it's OK.
2572 */
2573 return;
2574 }
2575
2576 addr6 = (struct sockaddr_in6 *)address;
2577 port = ntohs(addr6->sin6_port);
2578 /*
2579 * This is a special case that is safely ignored.
2580 */
2581 if (port == 0)
2582 return;
2583
2584 /*
2585 * Look for an existing port list entry.
2586 * This is an indication that a port is getting reused.
2587 */
2588 list_for_each_entry(spp, &smk_ipv6_port_list, list) {
2589 if (spp->smk_port != port)
2590 continue;
2591 spp->smk_port = port;
2592 spp->smk_sock = sk;
2593 spp->smk_in = ssp->smk_in;
2594 spp->smk_out = ssp->smk_out;
2595 return;
2596 }
2597
2598 /*
2599 * A new port entry is required.
2600 */
2601 spp = kzalloc(sizeof(*spp), GFP_KERNEL);
2602 if (spp == NULL)
2603 return;
2604
2605 spp->smk_port = port;
2606 spp->smk_sock = sk;
2607 spp->smk_in = ssp->smk_in;
2608 spp->smk_out = ssp->smk_out;
2609
2610 list_add(&spp->list, &smk_ipv6_port_list);
2611 return;
2612}
2613
2614/**
2615 * smk_ipv6_port_check - check Smack port access
2616 * @sock: socket
2617 * @address: address
2618 *
2619 * Create or update the port list entry
2620 */
6ea06247 2621static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address,
c6739443
CS		 2622 int act)
2623{
c6739443
CS		 2624 struct smk_port_label *spp;
2625 struct socket_smack *ssp = sk->sk_security;
21abb1ec
CS		 2626 struct smack_known *skp = NULL;
2627 unsigned short port;
21c7eae2 2628 struct smack_known *object;
c6739443
CS		 2629
2630 if (act == SMK_RECEIVING) {
21abb1ec 2631 skp = smack_ipv6host_label(address);
21c7eae2 2632 object = ssp->smk_in;
c6739443 2633 } else {
2f823ff8 2634 skp = ssp->smk_out;
21abb1ec 2635 object = smack_ipv6host_label(address);
c6739443
CS		 2636 }
2637
2638 /*
21abb1ec 2639 * The other end is a single label host.
c6739443 2640 */
21abb1ec
CS		 2641 if (skp != NULL && object != NULL)
2642 return smk_ipv6_check(skp, object, address, act);
2643 if (skp == NULL)
2644 skp = smack_net_ambient;
2645 if (object == NULL)
2646 object = smack_net_ambient;
c6739443
CS		 2647
2648 /*
2649 * It's remote, so port lookup does no good.
2650 */
21abb1ec
CS		 2651 if (!smk_ipv6_localhost(address))
2652 return smk_ipv6_check(skp, object, address, act);
c6739443
CS		 2653
2654 /*
2655 * It's local so the send check has to have passed.
2656 */
21abb1ec
CS		 2657 if (act == SMK_RECEIVING)
2658 return 0;
c6739443 2659
21abb1ec 2660 port = ntohs(address->sin6_port);
c6739443
CS		 2661 list_for_each_entry(spp, &smk_ipv6_port_list, list) {
2662 if (spp->smk_port != port)
2663 continue;
21c7eae2 2664 object = spp->smk_in;
c6739443 2665 if (act == SMK_CONNECTING)
54e70ec5 2666 ssp->smk_packet = spp->smk_out;
c6739443
CS		 2667 break;
2668 }
2669
21abb1ec 2670 return smk_ipv6_check(skp, object, address, act);
c6739443 2671}
21abb1ec 2672#endif /* SMACK_IPV6_PORT_LABELING */
c6739443 2673
e114e473
CS		 2674/**
2675 * smack_inode_setsecurity - set smack xattrs
2676 * @inode: the object
2677 * @name: attribute name
2678 * @value: attribute value
2679 * @size: size of the attribute
2680 * @flags: unused
2681 *
2682 * Sets the named attribute in the appropriate blob
2683 *
2684 * Returns 0 on success, or an error code
2685 */
2686static int smack_inode_setsecurity(struct inode *inode, const char *name,
2687 const void *value, size_t size, int flags)
2688{
2f823ff8 2689 struct smack_known *skp;
e114e473
CS		 2690 struct inode_smack *nsp = inode->i_security;
2691 struct socket_smack *ssp;
2692 struct socket *sock;
4bc87e62 2693 int rc = 0;
e114e473 2694
f7112e6c 2695 if (value == NULL || size > SMK_LONGLABEL || size == 0)
5e9ab593 2696 return -EINVAL;
e114e473 2697
2f823ff8 2698 skp = smk_import_entry(value, size);
e774ad68
LP		 2699 if (IS_ERR(skp))
2700 return PTR_ERR(skp);
e114e473
CS		 2701
2702 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
21c7eae2 2703 nsp->smk_inode = skp;
ddd29ec6 2704 nsp->smk_flags |= SMK_INODE_INSTANT;
e114e473
CS		 2705 return 0;
2706 }
2707 /*
2708 * The rest of the Smack xattrs are only on sockets.
2709 */
2710 if (inode->i_sb->s_magic != SOCKFS_MAGIC)
2711 return -EOPNOTSUPP;
2712
2713 sock = SOCKET_I(inode);
2e1d146a 2714 if (sock == NULL || sock->sk == NULL)
e114e473
CS		 2715 return -EOPNOTSUPP;
2716
2717 ssp = sock->sk->sk_security;
2718
2719 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
54e70ec5 2720 ssp->smk_in = skp;
e114e473 2721 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) {
2f823ff8 2722 ssp->smk_out = skp;
c6739443 2723 if (sock->sk->sk_family == PF_INET) {
b4e0d5f0
CS		 2724 rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
2725 if (rc != 0)
2726 printk(KERN_WARNING
2727 "Smack: \"%s\" netlbl error %d.\n",
2728 __func__, -rc);
2729 }
e114e473
CS		 2730 } else
2731 return -EOPNOTSUPP;
2732
21abb1ec 2733#ifdef SMACK_IPV6_PORT_LABELING
c6739443
CS		 2734 if (sock->sk->sk_family == PF_INET6)
2735 smk_ipv6_port_label(sock, NULL);
21abb1ec 2736#endif
c6739443 2737
e114e473
CS		 2738 return 0;
2739}
2740
2741/**
2742 * smack_socket_post_create - finish socket setup
2743 * @sock: the socket
2744 * @family: protocol family
2745 * @type: unused
2746 * @protocol: unused
2747 * @kern: unused
2748 *
2749 * Sets the netlabel information on the socket
2750 *
2751 * Returns 0 on success, and error code otherwise
2752 */
2753static int smack_socket_post_create(struct socket *sock, int family,
2754 int type, int protocol, int kern)
2755{
7412301b
ML		 2756 struct socket_smack *ssp;
2757
2758 if (sock->sk == NULL)
2759 return 0;
2760
2761 /*
2762 * Sockets created by kernel threads receive web label.
2763 */
2764 if (unlikely(current->flags & PF_KTHREAD)) {
2765 ssp = sock->sk->sk_security;
2766 ssp->smk_in = &smack_known_web;
2767 ssp->smk_out = &smack_known_web;
2768 }
2769
2770 if (family != PF_INET)
e114e473
CS		 2771 return 0;
2772 /*
2773 * Set the outbound netlbl.
2774 */
6d3dc07c
CS		 2775 return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
2776}
2777
21abb1ec 2778#ifdef SMACK_IPV6_PORT_LABELING
c6739443
CS		 2779/**
2780 * smack_socket_bind - record port binding information.
2781 * @sock: the socket
2782 * @address: the port address
2783 * @addrlen: size of the address
2784 *
2785 * Records the label bound to a port.
2786 *
2787 * Returns 0
2788 */
2789static int smack_socket_bind(struct socket *sock, struct sockaddr *address,
2790 int addrlen)
2791{
2792 if (sock->sk != NULL && sock->sk->sk_family == PF_INET6)
2793 smk_ipv6_port_label(sock, address);
c6739443
CS		 2794 return 0;
2795}
21abb1ec 2796#endif /* SMACK_IPV6_PORT_LABELING */
c6739443 2797
6d3dc07c
CS		 2798/**
2799 * smack_socket_connect - connect access check
2800 * @sock: the socket
2801 * @sap: the other end
2802 * @addrlen: size of sap
2803 *
2804 * Verifies that a connection may be possible
2805 *
2806 * Returns 0 on success, and error code otherwise
2807 */
2808static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
2809 int addrlen)
2810{
c6739443 2811 int rc = 0;
21abb1ec
CS		 2812#if IS_ENABLED(CONFIG_IPV6)
2813 struct sockaddr_in6 *sip = (struct sockaddr_in6 *)sap;
2814#endif
2815#ifdef SMACK_IPV6_SECMARK_LABELING
2816 struct smack_known *rsp;
2817 struct socket_smack *ssp = sock->sk->sk_security;
2818#endif
c6739443
CS		 2819
2820 if (sock->sk == NULL)
6d3dc07c 2821 return 0;
6d3dc07c 2822
c6739443
CS		 2823 switch (sock->sk->sk_family) {
2824 case PF_INET:
2825 if (addrlen < sizeof(struct sockaddr_in))
2826 return -EINVAL;
2827 rc = smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap);
2828 break;
2829 case PF_INET6:
2830 if (addrlen < sizeof(struct sockaddr_in6))
2831 return -EINVAL;
21abb1ec
CS		 2832#ifdef SMACK_IPV6_SECMARK_LABELING
2833 rsp = smack_ipv6host_label(sip);
2834 if (rsp != NULL)
2835 rc = smk_ipv6_check(ssp->smk_out, rsp, sip,
6ea06247 2836 SMK_CONNECTING);
21abb1ec
CS		 2837#endif
2838#ifdef SMACK_IPV6_PORT_LABELING
2839 rc = smk_ipv6_port_check(sock->sk, sip, SMK_CONNECTING);
2840#endif
c6739443
CS		 2841 break;
2842 }
2843 return rc;
e114e473
CS		 2844}
2845
2846/**
2847 * smack_flags_to_may - convert S_ to MAY_ values
2848 * @flags: the S_ value
2849 *
2850 * Returns the equivalent MAY_ value
2851 */
2852static int smack_flags_to_may(int flags)
2853{
2854 int may = 0;
2855
2856 if (flags & S_IRUGO)
2857 may |= MAY_READ;
2858 if (flags & S_IWUGO)
2859 may |= MAY_WRITE;
2860 if (flags & S_IXUGO)
2861 may |= MAY_EXEC;
2862
2863 return may;
2864}
2865
2866/**
2867 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
2868 * @msg: the object
2869 *
2870 * Returns 0
2871 */
2872static int smack_msg_msg_alloc_security(struct msg_msg *msg)
2873{
2f823ff8
CS		 2874 struct smack_known *skp = smk_of_current();
2875
21c7eae2 2876 msg->security = skp;
e114e473
CS		 2877 return 0;
2878}
2879
2880/**
2881 * smack_msg_msg_free_security - Clear the security blob for msg_msg
2882 * @msg: the object
2883 *
2884 * Clears the blob pointer
2885 */
2886static void smack_msg_msg_free_security(struct msg_msg *msg)
2887{
2888 msg->security = NULL;
2889}
2890
2891/**
2892 * smack_of_shm - the smack pointer for the shm
2893 * @shp: the object
2894 *
2895 * Returns a pointer to the smack value
2896 */
21c7eae2 2897static struct smack_known *smack_of_shm(struct shmid_kernel *shp)
e114e473 2898{
21c7eae2 2899 return (struct smack_known *)shp->shm_perm.security;
e114e473
CS		 2900}
2901
2902/**
2903 * smack_shm_alloc_security - Set the security blob for shm
2904 * @shp: the object
2905 *
2906 * Returns 0
2907 */
2908static int smack_shm_alloc_security(struct shmid_kernel *shp)
2909{
2910 struct kern_ipc_perm *isp = &shp->shm_perm;
2f823ff8 2911 struct smack_known *skp = smk_of_current();
e114e473 2912
21c7eae2 2913 isp->security = skp;
e114e473
CS		 2914 return 0;
2915}
2916
2917/**
2918 * smack_shm_free_security - Clear the security blob for shm
2919 * @shp: the object
2920 *
2921 * Clears the blob pointer
2922 */
2923static void smack_shm_free_security(struct shmid_kernel *shp)
2924{
2925 struct kern_ipc_perm *isp = &shp->shm_perm;
2926
2927 isp->security = NULL;
2928}
2929
ecfcc53f
EB		 2930/**
2931 * smk_curacc_shm : check if current has access on shm
2932 * @shp : the object
2933 * @access : access requested
2934 *
2935 * Returns 0 if current has the requested access, error code otherwise
2936 */
2937static int smk_curacc_shm(struct shmid_kernel *shp, int access)
2938{
21c7eae2 2939 struct smack_known *ssp = smack_of_shm(shp);
ecfcc53f 2940 struct smk_audit_info ad;
d166c802 2941 int rc;
ecfcc53f
EB		 2942
2943#ifdef CONFIG_AUDIT
2944 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2945 ad.a.u.ipc_id = shp->shm_perm.id;
2946#endif
d166c802
CS		 2947 rc = smk_curacc(ssp, access, &ad);
2948 rc = smk_bu_current("shm", ssp, access, rc);
2949 return rc;
ecfcc53f
EB		 2950}
2951
e114e473
CS		 2952/**
2953 * smack_shm_associate - Smack access check for shm
2954 * @shp: the object
2955 * @shmflg: access requested
2956 *
2957 * Returns 0 if current has the requested access, error code otherwise
2958 */
2959static int smack_shm_associate(struct shmid_kernel *shp, int shmflg)
2960{
e114e473
CS		 2961 int may;
2962
2963 may = smack_flags_to_may(shmflg);
ecfcc53f 2964 return smk_curacc_shm(shp, may);
e114e473
CS		 2965}
2966
2967/**
2968 * smack_shm_shmctl - Smack access check for shm
2969 * @shp: the object
2970 * @cmd: what it wants to do
2971 *
2972 * Returns 0 if current has the requested access, error code otherwise
2973 */
2974static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd)
2975{
e114e473
CS		 2976 int may;
2977
2978 switch (cmd) {
2979 case IPC_STAT:
2980 case SHM_STAT:
2981 may = MAY_READ;
2982 break;
2983 case IPC_SET:
2984 case SHM_LOCK:
2985 case SHM_UNLOCK:
2986 case IPC_RMID:
2987 may = MAY_READWRITE;
2988 break;
2989 case IPC_INFO:
2990 case SHM_INFO:
2991 /*
2992 * System level information.
2993 */
2994 return 0;
2995 default:
2996 return -EINVAL;
2997 }
ecfcc53f 2998 return smk_curacc_shm(shp, may);
e114e473
CS		 2999}
3000
3001/**
3002 * smack_shm_shmat - Smack access for shmat
3003 * @shp: the object
3004 * @shmaddr: unused
3005 * @shmflg: access requested
3006 *
3007 * Returns 0 if current has the requested access, error code otherwise
3008 */
3009static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr,
3010 int shmflg)
3011{
e114e473
CS		 3012 int may;
3013
3014 may = smack_flags_to_may(shmflg);
ecfcc53f 3015 return smk_curacc_shm(shp, may);
e114e473
CS		 3016}
3017
3018/**
3019 * smack_of_sem - the smack pointer for the sem
3020 * @sma: the object
3021 *
3022 * Returns a pointer to the smack value
3023 */
21c7eae2 3024static struct smack_known *smack_of_sem(struct sem_array *sma)
e114e473 3025{
21c7eae2 3026 return (struct smack_known *)sma->sem_perm.security;
e114e473
CS		 3027}
3028
3029/**
3030 * smack_sem_alloc_security - Set the security blob for sem
3031 * @sma: the object
3032 *
3033 * Returns 0
3034 */
3035static int smack_sem_alloc_security(struct sem_array *sma)
3036{
3037 struct kern_ipc_perm *isp = &sma->sem_perm;
2f823ff8 3038 struct smack_known *skp = smk_of_current();
e114e473 3039
21c7eae2 3040 isp->security = skp;
e114e473
CS		 3041 return 0;
3042}
3043
3044/**
3045 * smack_sem_free_security - Clear the security blob for sem
3046 * @sma: the object
3047 *
3048 * Clears the blob pointer
3049 */
3050static void smack_sem_free_security(struct sem_array *sma)
3051{
3052 struct kern_ipc_perm *isp = &sma->sem_perm;
3053
3054 isp->security = NULL;
3055}
3056
ecfcc53f
EB		 3057/**
3058 * smk_curacc_sem : check if current has access on sem
3059 * @sma : the object
3060 * @access : access requested
3061 *
3062 * Returns 0 if current has the requested access, error code otherwise
3063 */
3064static int smk_curacc_sem(struct sem_array *sma, int access)
3065{
21c7eae2 3066 struct smack_known *ssp = smack_of_sem(sma);
ecfcc53f 3067 struct smk_audit_info ad;
d166c802 3068 int rc;
ecfcc53f
EB		 3069
3070#ifdef CONFIG_AUDIT
3071 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3072 ad.a.u.ipc_id = sma->sem_perm.id;
3073#endif
d166c802
CS		 3074 rc = smk_curacc(ssp, access, &ad);
3075 rc = smk_bu_current("sem", ssp, access, rc);
3076 return rc;
ecfcc53f
EB		 3077}
3078
e114e473
CS		 3079/**
3080 * smack_sem_associate - Smack access check for sem
3081 * @sma: the object
3082 * @semflg: access requested
3083 *
3084 * Returns 0 if current has the requested access, error code otherwise
3085 */
3086static int smack_sem_associate(struct sem_array *sma, int semflg)
3087{
e114e473
CS		 3088 int may;
3089
3090 may = smack_flags_to_may(semflg);
ecfcc53f 3091 return smk_curacc_sem(sma, may);
e114e473
CS		 3092}
3093
3094/**
3095 * smack_sem_shmctl - Smack access check for sem
3096 * @sma: the object
3097 * @cmd: what it wants to do
3098 *
3099 * Returns 0 if current has the requested access, error code otherwise
3100 */
3101static int smack_sem_semctl(struct sem_array *sma, int cmd)
3102{
e114e473
CS		 3103 int may;
3104
3105 switch (cmd) {
3106 case GETPID:
3107 case GETNCNT:
3108 case GETZCNT:
3109 case GETVAL:
3110 case GETALL:
3111 case IPC_STAT:
3112 case SEM_STAT:
3113 may = MAY_READ;
3114 break;
3115 case SETVAL:
3116 case SETALL:
3117 case IPC_RMID:
3118 case IPC_SET:
3119 may = MAY_READWRITE;
3120 break;
3121 case IPC_INFO:
3122 case SEM_INFO:
3123 /*
3124 * System level information
3125 */
3126 return 0;
3127 default:
3128 return -EINVAL;
3129 }
3130
ecfcc53f 3131 return smk_curacc_sem(sma, may);
e114e473
CS		 3132}
3133
3134/**
3135 * smack_sem_semop - Smack checks of semaphore operations
3136 * @sma: the object
3137 * @sops: unused
3138 * @nsops: unused
3139 * @alter: unused
3140 *
3141 * Treated as read and write in all cases.
3142 *
3143 * Returns 0 if access is allowed, error code otherwise
3144 */
3145static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops,
3146 unsigned nsops, int alter)
3147{
ecfcc53f 3148 return smk_curacc_sem(sma, MAY_READWRITE);
e114e473
CS		 3149}
3150
3151/**
3152 * smack_msg_alloc_security - Set the security blob for msg
3153 * @msq: the object
3154 *
3155 * Returns 0
3156 */
3157static int smack_msg_queue_alloc_security(struct msg_queue *msq)
3158{
3159 struct kern_ipc_perm *kisp = &msq->q_perm;
2f823ff8 3160 struct smack_known *skp = smk_of_current();
e114e473 3161
21c7eae2 3162 kisp->security = skp;
e114e473
CS		 3163 return 0;
3164}
3165
3166/**
3167 * smack_msg_free_security - Clear the security blob for msg
3168 * @msq: the object
3169 *
3170 * Clears the blob pointer
3171 */
3172static void smack_msg_queue_free_security(struct msg_queue *msq)
3173{
3174 struct kern_ipc_perm *kisp = &msq->q_perm;
3175
3176 kisp->security = NULL;
3177}
3178
3179/**
3180 * smack_of_msq - the smack pointer for the msq
3181 * @msq: the object
3182 *
21c7eae2 3183 * Returns a pointer to the smack label entry
e114e473 3184 */
21c7eae2 3185static struct smack_known *smack_of_msq(struct msg_queue *msq)
e114e473 3186{
21c7eae2 3187 return (struct smack_known *)msq->q_perm.security;
e114e473
CS		 3188}
3189
ecfcc53f
EB		 3190/**
3191 * smk_curacc_msq : helper to check if current has access on msq
3192 * @msq : the msq
3193 * @access : access requested
3194 *
3195 * return 0 if current has access, error otherwise
3196 */
3197static int smk_curacc_msq(struct msg_queue *msq, int access)
3198{
21c7eae2 3199 struct smack_known *msp = smack_of_msq(msq);
ecfcc53f 3200 struct smk_audit_info ad;
d166c802 3201 int rc;
ecfcc53f
EB		 3202
3203#ifdef CONFIG_AUDIT
3204 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3205 ad.a.u.ipc_id = msq->q_perm.id;
3206#endif
d166c802
CS		 3207 rc = smk_curacc(msp, access, &ad);
3208 rc = smk_bu_current("msq", msp, access, rc);
3209 return rc;
ecfcc53f
EB		 3210}
3211
e114e473
CS		 3212/**
3213 * smack_msg_queue_associate - Smack access check for msg_queue
3214 * @msq: the object
3215 * @msqflg: access requested
3216 *
3217 * Returns 0 if current has the requested access, error code otherwise
3218 */
3219static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg)
3220{
e114e473
CS		 3221 int may;
3222
3223 may = smack_flags_to_may(msqflg);
ecfcc53f 3224 return smk_curacc_msq(msq, may);
e114e473
CS		 3225}
3226
3227/**
3228 * smack_msg_queue_msgctl - Smack access check for msg_queue
3229 * @msq: the object
3230 * @cmd: what it wants to do
3231 *
3232 * Returns 0 if current has the requested access, error code otherwise
3233 */
3234static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd)
3235{
e114e473
CS		 3236 int may;
3237
3238 switch (cmd) {
3239 case IPC_STAT:
3240 case MSG_STAT:
3241 may = MAY_READ;
3242 break;
3243 case IPC_SET:
3244 case IPC_RMID:
3245 may = MAY_READWRITE;
3246 break;
3247 case IPC_INFO:
3248 case MSG_INFO:
3249 /*
3250 * System level information
3251 */
3252 return 0;
3253 default:
3254 return -EINVAL;
3255 }
3256
ecfcc53f 3257 return smk_curacc_msq(msq, may);
e114e473
CS		 3258}
3259
3260/**
3261 * smack_msg_queue_msgsnd - Smack access check for msg_queue
3262 * @msq: the object
3263 * @msg: unused
3264 * @msqflg: access requested
3265 *
3266 * Returns 0 if current has the requested access, error code otherwise
3267 */
3268static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg,
3269 int msqflg)
3270{
ecfcc53f 3271 int may;
e114e473 3272
ecfcc53f
EB		 3273 may = smack_flags_to_may(msqflg);
3274 return smk_curacc_msq(msq, may);
e114e473
CS		 3275}
3276
3277/**
3278 * smack_msg_queue_msgsnd - Smack access check for msg_queue
3279 * @msq: the object
3280 * @msg: unused
3281 * @target: unused
3282 * @type: unused
3283 * @mode: unused
3284 *
3285 * Returns 0 if current has read and write access, error code otherwise
3286 */
3287static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
3288 struct task_struct *target, long type, int mode)
3289{
ecfcc53f 3290 return smk_curacc_msq(msq, MAY_READWRITE);
e114e473
CS		 3291}
3292
3293/**
3294 * smack_ipc_permission - Smack access for ipc_permission()
3295 * @ipp: the object permissions
3296 * @flag: access requested
3297 *
3298 * Returns 0 if current has read and write access, error code otherwise
3299 */
3300static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
3301{
21c7eae2 3302 struct smack_known *iskp = ipp->security;
ecfcc53f
EB		 3303 int may = smack_flags_to_may(flag);
3304 struct smk_audit_info ad;
d166c802 3305 int rc;
e114e473 3306
ecfcc53f
EB		 3307#ifdef CONFIG_AUDIT
3308 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3309 ad.a.u.ipc_id = ipp->id;
3310#endif
21c7eae2
LP		 3311 rc = smk_curacc(iskp, may, &ad);
3312 rc = smk_bu_current("svipc", iskp, may, rc);
d166c802 3313 return rc;
e114e473
CS		 3314}
3315
d20bdda6
AD		 3316/**
3317 * smack_ipc_getsecid - Extract smack security id
251a2a95 3318 * @ipp: the object permissions
d20bdda6
AD		 3319 * @secid: where result will be saved
3320 */
3321static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid)
3322{
21c7eae2 3323 struct smack_known *iskp = ipp->security;
d20bdda6 3324
21c7eae2 3325 *secid = iskp->smk_secid;
d20bdda6
AD		 3326}
3327
e114e473
CS		 3328/**
3329 * smack_d_instantiate - Make sure the blob is correct on an inode
3e62cbb8 3330 * @opt_dentry: dentry where inode will be attached
e114e473
CS		 3331 * @inode: the object
3332 *
3333 * Set the inode's security blob if it hasn't been done already.
3334 */
3335static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
3336{
3337 struct super_block *sbp;
3338 struct superblock_smack *sbsp;
3339 struct inode_smack *isp;
2f823ff8
CS		 3340 struct smack_known *skp;
3341 struct smack_known *ckp = smk_of_current();
21c7eae2 3342 struct smack_known *final;
5c6d1125
JS		 3343 char trattr[TRANS_TRUE_SIZE];
3344 int transflag = 0;
2267b13a 3345 int rc;
e114e473
CS		 3346 struct dentry *dp;
3347
3348 if (inode == NULL)
3349 return;
3350
3351 isp = inode->i_security;
3352
3353 mutex_lock(&isp->smk_lock);
3354 /*
3355 * If the inode is already instantiated
3356 * take the quick way out
3357 */
3358 if (isp->smk_flags & SMK_INODE_INSTANT)
3359 goto unlockandout;
3360
3361 sbp = inode->i_sb;
3362 sbsp = sbp->s_security;
3363 /*
3364 * We're going to use the superblock default label
3365 * if there's no label on the file.
3366 */
3367 final = sbsp->smk_default;
3368
e97dcb0e
CS		 3369 /*
3370 * If this is the root inode the superblock
3371 * may be in the process of initialization.
3372 * If that is the case use the root value out
3373 * of the superblock.
3374 */
3375 if (opt_dentry->d_parent == opt_dentry) {
1d8c2326
ŁS		 3376 switch (sbp->s_magic) {
3377 case CGROUP_SUPER_MAGIC:
36ea735b
CS		 3378 /*
3379 * The cgroup filesystem is never mounted,
3380 * so there's no opportunity to set the mount
3381 * options.
3382 */
21c7eae2
LP		 3383 sbsp->smk_root = &smack_known_star;
3384 sbsp->smk_default = &smack_known_star;
1d8c2326
ŁS		 3385 isp->smk_inode = sbsp->smk_root;
3386 break;
3387 case TMPFS_MAGIC:
3388 /*
3389 * What about shmem/tmpfs anonymous files with dentry
3390 * obtained from d_alloc_pseudo()?
3391 */
3392 isp->smk_inode = smk_of_current();
3393 break;
8da4aba5
RK		 3394 case PIPEFS_MAGIC:
3395 isp->smk_inode = smk_of_current();
3396 break;
1d8c2326
ŁS		 3397 default:
3398 isp->smk_inode = sbsp->smk_root;
3399 break;
36ea735b 3400 }
e97dcb0e
CS		 3401 isp->smk_flags |= SMK_INODE_INSTANT;
3402 goto unlockandout;
3403 }
3404
e114e473
CS		 3405 /*
3406 * This is pretty hackish.
3407 * Casey says that we shouldn't have to do
3408 * file system specific code, but it does help
3409 * with keeping it simple.
3410 */
3411 switch (sbp->s_magic) {
3412 case SMACK_MAGIC:
36ea735b
CS		 3413 case PIPEFS_MAGIC:
3414 case SOCKFS_MAGIC:
3415 case CGROUP_SUPER_MAGIC:
e114e473 3416 /*
25985edc 3417 * Casey says that it's a little embarrassing
e114e473
CS		 3418 * that the smack file system doesn't do
3419 * extended attributes.
36ea735b 3420 *
e114e473 3421 * Casey says pipes are easy (?)
36ea735b
CS		 3422 *
3423 * Socket access is controlled by the socket
3424 * structures associated with the task involved.
3425 *
3426 * Cgroupfs is special
e114e473 3427 */
21c7eae2 3428 final = &smack_known_star;
e114e473
CS		 3429 break;
3430 case DEVPTS_SUPER_MAGIC:
3431 /*
3432 * devpts seems content with the label of the task.
3433 * Programs that change smack have to treat the
3434 * pty with respect.
3435 */
21c7eae2 3436 final = ckp;
e114e473 3437 break;
e114e473
CS		 3438 case PROC_SUPER_MAGIC:
3439 /*
3440 * Casey says procfs appears not to care.
3441 * The superblock default suffices.
3442 */
3443 break;
3444 case TMPFS_MAGIC:
3445 /*
3446 * Device labels should come from the filesystem,
3447 * but watch out, because they're volitile,
3448 * getting recreated on every reboot.
3449 */
21c7eae2 3450 final = &smack_known_star;
e114e473
CS		 3451 /*
3452 * No break.
3453 *
3454 * If a smack value has been set we want to use it,
3455 * but since tmpfs isn't giving us the opportunity
3456 * to set mount options simulate setting the
3457 * superblock default.
3458 */
3459 default:
3460 /*
3461 * This isn't an understood special case.
3462 * Get the value from the xattr.
b4e0d5f0
CS		 3463 */
3464
3465 /*
3466 * UNIX domain sockets use lower level socket data.
3467 */
3468 if (S_ISSOCK(inode->i_mode)) {
21c7eae2 3469 final = &smack_known_star;
b4e0d5f0
CS		 3470 break;
3471 }
3472 /*
e114e473
CS		 3473 * No xattr support means, alas, no SMACK label.
3474 * Use the aforeapplied default.
3475 * It would be curious if the label of the task
3476 * does not match that assigned.
3477 */
3478 if (inode->i_op->getxattr == NULL)
3479 break;
3480 /*
3481 * Get the dentry for xattr.
3482 */
3e62cbb8 3483 dp = dget(opt_dentry);
2f823ff8 3484 skp = smk_fetch(XATTR_NAME_SMACK, inode, dp);
e774ad68 3485 if (!IS_ERR_OR_NULL(skp))
21c7eae2 3486 final = skp;
2267b13a
CS		 3487
3488 /*
3489 * Transmuting directory
3490 */
3491 if (S_ISDIR(inode->i_mode)) {
3492 /*
3493 * If this is a new directory and the label was
3494 * transmuted when the inode was initialized
3495 * set the transmute attribute on the directory
3496 * and mark the inode.
3497 *
3498 * If there is a transmute attribute on the
3499 * directory mark the inode.
3500 */
3501 if (isp->smk_flags & SMK_INODE_CHANGED) {
3502 isp->smk_flags &= ~SMK_INODE_CHANGED;
3503 rc = inode->i_op->setxattr(dp,
5c6d1125 3504 XATTR_NAME_SMACKTRANSMUTE,
2267b13a
CS		 3505 TRANS_TRUE, TRANS_TRUE_SIZE,
3506 0);
3507 } else {
3508 rc = inode->i_op->getxattr(dp,
3509 XATTR_NAME_SMACKTRANSMUTE, trattr,
3510 TRANS_TRUE_SIZE);
3511 if (rc >= 0 && strncmp(trattr, TRANS_TRUE,
3512 TRANS_TRUE_SIZE) != 0)
3513 rc = -EINVAL;
5c6d1125 3514 }
2267b13a
CS		 3515 if (rc >= 0)
3516 transflag = SMK_INODE_TRANSMUTE;
5c6d1125 3517 }
19760ad0
CS		 3518 /*
3519 * Don't let the exec or mmap label be "*" or "@".
3520 */
3521 skp = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp);
e774ad68
LP		 3522 if (IS_ERR(skp) || skp == &smack_known_star ||
3523 skp == &smack_known_web)
19760ad0
CS		 3524 skp = NULL;
3525 isp->smk_task = skp;
e774ad68 3526
19760ad0 3527 skp = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp);
e774ad68
LP		 3528 if (IS_ERR(skp) || skp == &smack_known_star ||
3529 skp == &smack_known_web)
19760ad0
CS		 3530 skp = NULL;
3531 isp->smk_mmap = skp;
676dac4b 3532
e114e473
CS		 3533 dput(dp);
3534 break;
3535 }
3536
3537 if (final == NULL)
21c7eae2 3538 isp->smk_inode = ckp;
e114e473
CS		 3539 else
3540 isp->smk_inode = final;
3541
5c6d1125 3542 isp->smk_flags |= (SMK_INODE_INSTANT | transflag);
e114e473
CS		 3543
3544unlockandout:
3545 mutex_unlock(&isp->smk_lock);
3546 return;
3547}
3548
3549/**
3550 * smack_getprocattr - Smack process attribute access
3551 * @p: the object task
3552 * @name: the name of the attribute in /proc/.../attr
3553 * @value: where to put the result
3554 *
3555 * Places a copy of the task Smack into value
3556 *
3557 * Returns the length of the smack label or an error code
3558 */
3559static int smack_getprocattr(struct task_struct *p, char *name, char **value)
3560{
6d1cff2a 3561 struct smack_known *skp = smk_of_task_struct(p);
e114e473
CS		 3562 char *cp;
3563 int slen;
3564
3565 if (strcmp(name, "current") != 0)
3566 return -EINVAL;
3567
2f823ff8 3568 cp = kstrdup(skp->smk_known, GFP_KERNEL);
e114e473
CS		 3569 if (cp == NULL)
3570 return -ENOMEM;
3571
3572 slen = strlen(cp);
3573 *value = cp;
3574 return slen;
3575}
3576
3577/**
3578 * smack_setprocattr - Smack process attribute setting
3579 * @p: the object task
3580 * @name: the name of the attribute in /proc/.../attr
3581 * @value: the value to set
3582 * @size: the size of the value
3583 *
3584 * Sets the Smack value of the task. Only setting self
3585 * is permitted and only with privilege
3586 *
3587 * Returns the length of the smack label or an error code
3588 */
3589static int smack_setprocattr(struct task_struct *p, char *name,
3590 void *value, size_t size)
3591{
38416e53 3592 struct task_smack *tsp = current_security();
d84f4f99 3593 struct cred *new;
2f823ff8 3594 struct smack_known *skp;
38416e53
ZJ		 3595 struct smack_known_list_elem *sklep;
3596 int rc;
e114e473 3597
e114e473
CS		 3598 /*
3599 * Changing another process' Smack value is too dangerous
3600 * and supports no sane use case.
3601 */
3602 if (p != current)
3603 return -EPERM;
3604
38416e53 3605 if (!smack_privileged(CAP_MAC_ADMIN) && list_empty(&tsp->smk_relabel))
5cd9c58f
DH		 3606 return -EPERM;
3607
f7112e6c 3608 if (value == NULL || size == 0 || size >= SMK_LONGLABEL)
e114e473
CS		 3609 return -EINVAL;
3610
3611 if (strcmp(name, "current") != 0)
3612 return -EINVAL;
3613
2f823ff8 3614 skp = smk_import_entry(value, size);
e774ad68
LP		 3615 if (IS_ERR(skp))
3616 return PTR_ERR(skp);
e114e473 3617
6d3dc07c
CS		 3618 /*
3619 * No process is ever allowed the web ("@") label.
3620 */
2f823ff8 3621 if (skp == &smack_known_web)
6d3dc07c
CS		 3622 return -EPERM;
3623
38416e53
ZJ		 3624 if (!smack_privileged(CAP_MAC_ADMIN)) {
3625 rc = -EPERM;
3626 list_for_each_entry(sklep, &tsp->smk_relabel, list)
3627 if (sklep->smk_label == skp) {
3628 rc = 0;
3629 break;
3630 }
3631 if (rc)
3632 return rc;
3633 }
3634
d84f4f99 3635 new = prepare_creds();
6d3dc07c 3636 if (new == NULL)
d84f4f99 3637 return -ENOMEM;
7898e1f8 3638
46a2f3b9 3639 tsp = new->security;
2f823ff8 3640 tsp->smk_task = skp;
38416e53
ZJ		 3641 /*
3642 * process can change its label only once
3643 */
3644 smk_destroy_label_list(&tsp->smk_relabel);
7898e1f8 3645
d84f4f99 3646 commit_creds(new);
e114e473
CS		 3647 return size;
3648}
3649
3650/**
3651 * smack_unix_stream_connect - Smack access on UDS
3610cda5
DM		 3652 * @sock: one sock
3653 * @other: the other sock
e114e473
CS		 3654 * @newsk: unused
3655 *
3656 * Return 0 if a subject with the smack of sock could access
3657 * an object with the smack of other, otherwise an error code
3658 */
3610cda5
DM		 3659static int smack_unix_stream_connect(struct sock *sock,
3660 struct sock *other, struct sock *newsk)
e114e473 3661{
2f823ff8 3662 struct smack_known *skp;
54e70ec5 3663 struct smack_known *okp;
d2e7ad19
JM		 3664 struct socket_smack *ssp = sock->sk_security;
3665 struct socket_smack *osp = other->sk_security;
975d5e55 3666 struct socket_smack *nsp = newsk->sk_security;
ecfcc53f 3667 struct smk_audit_info ad;
b4e0d5f0 3668 int rc = 0;
923e9a13
KC		 3669#ifdef CONFIG_AUDIT
3670 struct lsm_network_audit net;
923e9a13 3671#endif
b4e0d5f0 3672
2f823ff8
CS		 3673 if (!smack_privileged(CAP_MAC_OVERRIDE)) {
3674 skp = ssp->smk_out;
96be7b54 3675 okp = osp->smk_in;
54e70ec5
CS		 3676#ifdef CONFIG_AUDIT
3677 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3678 smk_ad_setfield_u_net_sk(&ad, other);
3679#endif
21c7eae2
LP		 3680 rc = smk_access(skp, okp, MAY_WRITE, &ad);
3681 rc = smk_bu_note("UDS connect", skp, okp, MAY_WRITE, rc);
d166c802 3682 if (rc == 0) {
96be7b54
ZJ		 3683 okp = osp->smk_out;
3684 skp = ssp->smk_in;
138a868f 3685 rc = smk_access(okp, skp, MAY_WRITE, &ad);
21c7eae2 3686 rc = smk_bu_note("UDS connect", okp, skp,
d166c802
CS		 3687 MAY_WRITE, rc);
3688 }
2f823ff8 3689 }
b4e0d5f0 3690
975d5e55
CS		 3691 /*
3692 * Cross reference the peer labels for SO_PEERSEC.
3693 */
3694 if (rc == 0) {
54e70ec5
CS		 3695 nsp->smk_packet = ssp->smk_out;
3696 ssp->smk_packet = osp->smk_out;
975d5e55
CS		 3697 }
3698
b4e0d5f0 3699 return rc;
e114e473
CS		 3700}
3701
3702/**
3703 * smack_unix_may_send - Smack access on UDS
3704 * @sock: one socket
3705 * @other: the other socket
3706 *
3707 * Return 0 if a subject with the smack of sock could access
3708 * an object with the smack of other, otherwise an error code
3709 */
3710static int smack_unix_may_send(struct socket *sock, struct socket *other)
3711{
b4e0d5f0
CS		 3712 struct socket_smack *ssp = sock->sk->sk_security;
3713 struct socket_smack *osp = other->sk->sk_security;
ecfcc53f 3714 struct smk_audit_info ad;
d166c802 3715 int rc;
e114e473 3716
923e9a13
KC		 3717#ifdef CONFIG_AUDIT
3718 struct lsm_network_audit net;
3719
48c62af6 3720 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
ecfcc53f 3721 smk_ad_setfield_u_net_sk(&ad, other->sk);
923e9a13 3722#endif
b4e0d5f0 3723
2f823ff8
CS		 3724 if (smack_privileged(CAP_MAC_OVERRIDE))
3725 return 0;
b4e0d5f0 3726
21c7eae2
LP		 3727 rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad);
3728 rc = smk_bu_note("UDS send", ssp->smk_out, osp->smk_in, MAY_WRITE, rc);
d166c802 3729 return rc;
e114e473
CS		 3730}
3731
6d3dc07c
CS		 3732/**
3733 * smack_socket_sendmsg - Smack check based on destination host
3734 * @sock: the socket
251a2a95 3735 * @msg: the message
6d3dc07c
CS		 3736 * @size: the size of the message
3737 *
c6739443
CS		 3738 * Return 0 if the current subject can write to the destination host.
3739 * For IPv4 this is only a question if the destination is a single label host.
3740 * For IPv6 this is a check against the label of the port.
6d3dc07c
CS		 3741 */
3742static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
3743 int size)
3744{
3745 struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name;
21abb1ec 3746#if IS_ENABLED(CONFIG_IPV6)
6ea06247 3747 struct sockaddr_in6 *sap = (struct sockaddr_in6 *) msg->msg_name;
21abb1ec
CS		 3748#endif
3749#ifdef SMACK_IPV6_SECMARK_LABELING
3750 struct socket_smack *ssp = sock->sk->sk_security;
3751 struct smack_known *rsp;
3752#endif
c6739443 3753 int rc = 0;
6d3dc07c
CS		 3754
3755 /*
3756 * Perfectly reasonable for this to be NULL
3757 */
c6739443 3758 if (sip == NULL)
6d3dc07c
CS		 3759 return 0;
3760
c6739443
CS		 3761 switch (sip->sin_family) {
3762 case AF_INET:
3763 rc = smack_netlabel_send(sock->sk, sip);
3764 break;
3765 case AF_INET6:
21abb1ec
CS		 3766#ifdef SMACK_IPV6_SECMARK_LABELING
3767 rsp = smack_ipv6host_label(sap);
3768 if (rsp != NULL)
3769 rc = smk_ipv6_check(ssp->smk_out, rsp, sap,
3770 SMK_CONNECTING);
3771#endif
3772#ifdef SMACK_IPV6_PORT_LABELING
c6739443 3773 rc = smk_ipv6_port_check(sock->sk, sap, SMK_SENDING);
21abb1ec 3774#endif
c6739443
CS		 3775 break;
3776 }
3777 return rc;
6d3dc07c
CS		 3778}
3779
e114e473 3780/**
251a2a95 3781 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
e114e473 3782 * @sap: netlabel secattr
272cd7a8 3783 * @ssp: socket security information
e114e473 3784 *
2f823ff8 3785 * Returns a pointer to a Smack label entry found on the label list.
e114e473 3786 */
2f823ff8
CS		 3787static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap,
3788 struct socket_smack *ssp)
e114e473 3789{
2f823ff8 3790 struct smack_known *skp;
f7112e6c 3791 int found = 0;
677264e8
CS		 3792 int acat;
3793 int kcat;
e114e473 3794
6d3dc07c 3795 if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) {
e114e473 3796 /*
6d3dc07c 3797 * Looks like a CIPSO packet.
e114e473
CS		 3798 * If there are flags but no level netlabel isn't
3799 * behaving the way we expect it to.
3800 *
f7112e6c 3801 * Look it up in the label table
e114e473
CS		 3802 * Without guidance regarding the smack value
3803 * for the packet fall back on the network
3804 * ambient value.
3805 */
f7112e6c 3806 rcu_read_lock();
2f823ff8
CS		 3807 list_for_each_entry(skp, &smack_known_list, list) {
3808 if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl)
f7112e6c 3809 continue;
677264e8
CS		 3810 /*
3811 * Compare the catsets. Use the netlbl APIs.
3812 */
3813 if ((sap->flags & NETLBL_SECATTR_MLS_CAT) == 0) {
3814 if ((skp->smk_netlabel.flags &
3815 NETLBL_SECATTR_MLS_CAT) == 0)
3816 found = 1;
3817 break;
3818 }
3819 for (acat = -1, kcat = -1; acat == kcat; ) {
4fbe63d1
PM		 3820 acat = netlbl_catmap_walk(sap->attr.mls.cat,
3821 acat + 1);
3822 kcat = netlbl_catmap_walk(
677264e8
CS		 3823 skp->smk_netlabel.attr.mls.cat,
3824 kcat + 1);
3825 if (acat < 0 || kcat < 0)
3826 break;
3827 }
3828 if (acat == kcat) {
3829 found = 1;
3830 break;
3831 }
6d3dc07c 3832 }
f7112e6c
CS		 3833 rcu_read_unlock();
3834
3835 if (found)
2f823ff8 3836 return skp;
f7112e6c 3837
54e70ec5 3838 if (ssp != NULL && ssp->smk_in == &smack_known_star)
2f823ff8
CS		 3839 return &smack_known_web;
3840 return &smack_known_star;
e114e473 3841 }
6d3dc07c
CS		 3842 if ((sap->flags & NETLBL_SECATTR_SECID) != 0) {
3843 /*
3844 * Looks like a fallback, which gives us a secid.
3845 */
2f823ff8 3846 skp = smack_from_secid(sap->attr.secid);
6d3dc07c
CS		 3847 /*
3848 * This has got to be a bug because it is
3849 * impossible to specify a fallback without
3850 * specifying the label, which will ensure
3851 * it has a secid, and the only way to get a
3852 * secid is from a fallback.
3853 */
2f823ff8
CS		 3854 BUG_ON(skp == NULL);
3855 return skp;
e114e473
CS		 3856 }
3857 /*
6d3dc07c
CS		 3858 * Without guidance regarding the smack value
3859 * for the packet fall back on the network
3860 * ambient value.
e114e473 3861 */
272cd7a8 3862 return smack_net_ambient;
e114e473
CS		 3863}
3864
69f287ae 3865#if IS_ENABLED(CONFIG_IPV6)
6ea06247 3866static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr_in6 *sip)
c6739443 3867{
c6739443
CS		 3868 u8 nexthdr;
3869 int offset;
3870 int proto = -EINVAL;
3871 struct ipv6hdr _ipv6h;
3872 struct ipv6hdr *ip6;
3873 __be16 frag_off;
3874 struct tcphdr _tcph, *th;
3875 struct udphdr _udph, *uh;
3876 struct dccp_hdr _dccph, *dh;
3877
3878 sip->sin6_port = 0;
3879
3880 offset = skb_network_offset(skb);
3881 ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h);
3882 if (ip6 == NULL)
3883 return -EINVAL;
3884 sip->sin6_addr = ip6->saddr;
3885
3886 nexthdr = ip6->nexthdr;
3887 offset += sizeof(_ipv6h);
3888 offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
3889 if (offset < 0)
3890 return -EINVAL;
3891
3892 proto = nexthdr;
3893 switch (proto) {
3894 case IPPROTO_TCP:
3895 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
3896 if (th != NULL)
3897 sip->sin6_port = th->source;
3898 break;
3899 case IPPROTO_UDP:
3900 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
3901 if (uh != NULL)
3902 sip->sin6_port = uh->source;
3903 break;
3904 case IPPROTO_DCCP:
3905 dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
3906 if (dh != NULL)
3907 sip->sin6_port = dh->dccph_sport;
3908 break;
3909 }
3910 return proto;
3911}
69f287ae 3912#endif /* CONFIG_IPV6 */
c6739443 3913
e114e473
CS		 3914/**
3915 * smack_socket_sock_rcv_skb - Smack packet delivery access check
3916 * @sk: socket
3917 * @skb: packet
3918 *
3919 * Returns 0 if the packet should be delivered, an error code otherwise
3920 */
3921static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
3922{
3923 struct netlbl_lsm_secattr secattr;
3924 struct socket_smack *ssp = sk->sk_security;
69f287ae 3925 struct smack_known *skp = NULL;
c6739443 3926 int rc = 0;
ecfcc53f 3927 struct smk_audit_info ad;
923e9a13 3928#ifdef CONFIG_AUDIT
48c62af6 3929 struct lsm_network_audit net;
923e9a13 3930#endif
69f287ae
CS		 3931#if IS_ENABLED(CONFIG_IPV6)
3932 struct sockaddr_in6 sadd;
3933 int proto;
3934#endif /* CONFIG_IPV6 */
3935
c6739443
CS		 3936 switch (sk->sk_family) {
3937 case PF_INET:
69f287ae
CS		 3938#ifdef CONFIG_SECURITY_SMACK_NETFILTER
3939 /*
3940 * If there is a secmark use it rather than the CIPSO label.
3941 * If there is no secmark fall back to CIPSO.
3942 * The secmark is assumed to reflect policy better.
3943 */
3944 if (skb && skb->secmark != 0) {
3945 skp = smack_from_secid(skb->secmark);
3946 goto access_check;
3947 }
3948#endif /* CONFIG_SECURITY_SMACK_NETFILTER */
c6739443
CS		 3949 /*
3950 * Translate what netlabel gave us.
3951 */
3952 netlbl_secattr_init(&secattr);
6d3dc07c 3953
c6739443
CS		 3954 rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr);
3955 if (rc == 0)
2f823ff8 3956 skp = smack_from_secattr(&secattr, ssp);
c6739443 3957 else
2f823ff8 3958 skp = smack_net_ambient;
6d3dc07c 3959
c6739443 3960 netlbl_secattr_destroy(&secattr);
6d3dc07c 3961
69f287ae
CS		 3962#ifdef CONFIG_SECURITY_SMACK_NETFILTER
3963access_check:
3964#endif
ecfcc53f 3965#ifdef CONFIG_AUDIT
c6739443
CS		 3966 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3967 ad.a.u.net->family = sk->sk_family;
3968 ad.a.u.net->netif = skb->skb_iif;
3969 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
ecfcc53f 3970#endif
c6739443
CS		 3971 /*
3972 * Receiving a packet requires that the other end
3973 * be able to write here. Read access is not required.
3974 * This is the simplist possible security model
3975 * for networking.
3976 */
21c7eae2
LP		 3977 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
3978 rc = smk_bu_note("IPv4 delivery", skp, ssp->smk_in,
d166c802 3979 MAY_WRITE, rc);
c6739443
CS		 3980 if (rc != 0)
3981 netlbl_skbuff_err(skb, rc, 0);
3982 break;
69f287ae 3983#if IS_ENABLED(CONFIG_IPV6)
c6739443 3984 case PF_INET6:
69f287ae
CS		 3985 proto = smk_skb_to_addr_ipv6(skb, &sadd);
3986 if (proto != IPPROTO_UDP && proto != IPPROTO_TCP)
3987 break;
21abb1ec 3988#ifdef SMACK_IPV6_SECMARK_LABELING
69f287ae
CS		 3989 if (skb && skb->secmark != 0)
3990 skp = smack_from_secid(skb->secmark);
c6739443 3991 else
21abb1ec
CS		 3992 skp = smack_ipv6host_label(&sadd);
3993 if (skp == NULL)
69f287ae
CS		 3994 skp = smack_net_ambient;
3995#ifdef CONFIG_AUDIT
3996 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3997 ad.a.u.net->family = sk->sk_family;
3998 ad.a.u.net->netif = skb->skb_iif;
3999 ipv6_skb_to_auditdata(skb, &ad.a, NULL);
4000#endif /* CONFIG_AUDIT */
4001 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
4002 rc = smk_bu_note("IPv6 delivery", skp, ssp->smk_in,
4003 MAY_WRITE, rc);
21abb1ec
CS		 4004#endif /* SMACK_IPV6_SECMARK_LABELING */
4005#ifdef SMACK_IPV6_PORT_LABELING
69f287ae 4006 rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING);
21abb1ec 4007#endif /* SMACK_IPV6_PORT_LABELING */
c6739443 4008 break;
69f287ae 4009#endif /* CONFIG_IPV6 */
c6739443 4010 }
69f287ae 4011
a8134296 4012 return rc;
e114e473
CS		 4013}
4014
4015/**
4016 * smack_socket_getpeersec_stream - pull in packet label
4017 * @sock: the socket
4018 * @optval: user's destination
4019 * @optlen: size thereof
251a2a95 4020 * @len: max thereof
e114e473
CS		 4021 *
4022 * returns zero on success, an error code otherwise
4023 */
4024static int smack_socket_getpeersec_stream(struct socket *sock,
4025 char __user *optval,
4026 int __user *optlen, unsigned len)
4027{
4028 struct socket_smack *ssp;
272cd7a8
CS		 4029 char *rcp = "";
4030 int slen = 1;
e114e473
CS		 4031 int rc = 0;
4032
4033 ssp = sock->sk->sk_security;
272cd7a8 4034 if (ssp->smk_packet != NULL) {
54e70ec5 4035 rcp = ssp->smk_packet->smk_known;
272cd7a8
CS		 4036 slen = strlen(rcp) + 1;
4037 }
e114e473
CS		 4038
4039 if (slen > len)
4040 rc = -ERANGE;
272cd7a8 4041 else if (copy_to_user(optval, rcp, slen) != 0)
e114e473
CS		 4042 rc = -EFAULT;
4043
4044 if (put_user(slen, optlen) != 0)
4045 rc = -EFAULT;
4046
4047 return rc;
4048}
4049
4050
4051/**
4052 * smack_socket_getpeersec_dgram - pull in packet label
b4e0d5f0 4053 * @sock: the peer socket
e114e473
CS		 4054 * @skb: packet data
4055 * @secid: pointer to where to put the secid of the packet
4056 *
4057 * Sets the netlabel socket state on sk from parent
4058 */
4059static int smack_socket_getpeersec_dgram(struct socket *sock,
4060 struct sk_buff *skb, u32 *secid)
4061
4062{
4063 struct netlbl_lsm_secattr secattr;
272cd7a8 4064 struct socket_smack *ssp = NULL;
2f823ff8 4065 struct smack_known *skp;
b4e0d5f0
CS		 4066 int family = PF_UNSPEC;
4067 u32 s = 0; /* 0 is the invalid secid */
e114e473
CS		 4068 int rc;
4069
b4e0d5f0
CS		 4070 if (skb != NULL) {
4071 if (skb->protocol == htons(ETH_P_IP))
4072 family = PF_INET;
69f287ae 4073#if IS_ENABLED(CONFIG_IPV6)
b4e0d5f0
CS		 4074 else if (skb->protocol == htons(ETH_P_IPV6))
4075 family = PF_INET6;
69f287ae 4076#endif /* CONFIG_IPV6 */
e114e473 4077 }
b4e0d5f0
CS		 4078 if (family == PF_UNSPEC && sock != NULL)
4079 family = sock->sk->sk_family;
e114e473 4080
69f287ae
CS		 4081 switch (family) {
4082 case PF_UNIX:
272cd7a8 4083 ssp = sock->sk->sk_security;
2f823ff8 4084 s = ssp->smk_out->smk_secid;
69f287ae
CS		 4085 break;
4086 case PF_INET:
4087#ifdef CONFIG_SECURITY_SMACK_NETFILTER
4088 s = skb->secmark;
4089 if (s != 0)
4090 break;
4091#endif
b4e0d5f0
CS		 4092 /*
4093 * Translate what netlabel gave us.
4094 */
272cd7a8
CS		 4095 if (sock != NULL && sock->sk != NULL)
4096 ssp = sock->sk->sk_security;
b4e0d5f0
CS		 4097 netlbl_secattr_init(&secattr);
4098 rc = netlbl_skbuff_getattr(skb, family, &secattr);
4099 if (rc == 0) {
2f823ff8
CS		 4100 skp = smack_from_secattr(&secattr, ssp);
4101 s = skp->smk_secid;
b4e0d5f0
CS		 4102 }
4103 netlbl_secattr_destroy(&secattr);
69f287ae 4104 break;
69f287ae 4105 case PF_INET6:
21abb1ec 4106#ifdef SMACK_IPV6_SECMARK_LABELING
69f287ae 4107 s = skb->secmark;
21abb1ec 4108#endif
69f287ae 4109 break;
b4e0d5f0
CS		 4110 }
4111 *secid = s;
e114e473
CS		 4112 if (s == 0)
4113 return -EINVAL;
e114e473
CS		 4114 return 0;
4115}
4116
4117/**
07feee8f
PM		 4118 * smack_sock_graft - Initialize a newly created socket with an existing sock
4119 * @sk: child sock
4120 * @parent: parent socket
e114e473 4121 *
07feee8f
PM		 4122 * Set the smk_{in,out} state of an existing sock based on the process that
4123 * is creating the new socket.
e114e473
CS		 4124 */
4125static void smack_sock_graft(struct sock *sk, struct socket *parent)
4126{
4127 struct socket_smack *ssp;
2f823ff8 4128 struct smack_known *skp = smk_of_current();
e114e473 4129
07feee8f
PM		 4130 if (sk == NULL ||
4131 (sk->sk_family != PF_INET && sk->sk_family != PF_INET6))
e114e473
CS		 4132 return;
4133
4134 ssp = sk->sk_security;
54e70ec5 4135 ssp->smk_in = skp;
2f823ff8 4136 ssp->smk_out = skp;
07feee8f 4137 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
e114e473
CS		 4138}
4139
4140/**
4141 * smack_inet_conn_request - Smack access check on connect
4142 * @sk: socket involved
4143 * @skb: packet
4144 * @req: unused
4145 *
4146 * Returns 0 if a task with the packet label could write to
4147 * the socket, otherwise an error code
4148 */
4149static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
4150 struct request_sock *req)
4151{
07feee8f 4152 u16 family = sk->sk_family;
f7112e6c 4153 struct smack_known *skp;
e114e473 4154 struct socket_smack *ssp = sk->sk_security;
07feee8f
PM		 4155 struct netlbl_lsm_secattr secattr;
4156 struct sockaddr_in addr;
4157 struct iphdr *hdr;
21c7eae2 4158 struct smack_known *hskp;
e114e473 4159 int rc;
ecfcc53f 4160 struct smk_audit_info ad;
923e9a13 4161#ifdef CONFIG_AUDIT
48c62af6 4162 struct lsm_network_audit net;
923e9a13 4163#endif
e114e473 4164
69f287ae 4165#if IS_ENABLED(CONFIG_IPV6)
c6739443
CS		 4166 if (family == PF_INET6) {
4167 /*
4168 * Handle mapped IPv4 packets arriving
4169 * via IPv6 sockets. Don't set up netlabel
4170 * processing on IPv6.
4171 */
4172 if (skb->protocol == htons(ETH_P_IP))
4173 family = PF_INET;
4174 else
4175 return 0;
4176 }
69f287ae 4177#endif /* CONFIG_IPV6 */
e114e473 4178
7f368ad3
CS		 4179#ifdef CONFIG_SECURITY_SMACK_NETFILTER
4180 /*
4181 * If there is a secmark use it rather than the CIPSO label.
4182 * If there is no secmark fall back to CIPSO.
4183 * The secmark is assumed to reflect policy better.
4184 */
4185 if (skb && skb->secmark != 0) {
4186 skp = smack_from_secid(skb->secmark);
4187 goto access_check;
4188 }
4189#endif /* CONFIG_SECURITY_SMACK_NETFILTER */
4190
07feee8f
PM		 4191 netlbl_secattr_init(&secattr);
4192 rc = netlbl_skbuff_getattr(skb, family, &secattr);
e114e473 4193 if (rc == 0)
2f823ff8 4194 skp = smack_from_secattr(&secattr, ssp);
e114e473 4195 else
2f823ff8 4196 skp = &smack_known_huh;
07feee8f
PM		 4197 netlbl_secattr_destroy(&secattr);
4198
7f368ad3
CS		 4199#ifdef CONFIG_SECURITY_SMACK_NETFILTER
4200access_check:
4201#endif
4202
ecfcc53f 4203#ifdef CONFIG_AUDIT
48c62af6
EP		 4204 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
4205 ad.a.u.net->family = family;
4206 ad.a.u.net->netif = skb->skb_iif;
ecfcc53f
EB		 4207 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
4208#endif
e114e473 4209 /*
07feee8f
PM		 4210 * Receiving a packet requires that the other end be able to write
4211 * here. Read access is not required.
e114e473 4212 */
21c7eae2
LP		 4213 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
4214 rc = smk_bu_note("IPv4 connect", skp, ssp->smk_in, MAY_WRITE, rc);
07feee8f
PM		 4215 if (rc != 0)
4216 return rc;
4217
4218 /*
4219 * Save the peer's label in the request_sock so we can later setup
4220 * smk_packet in the child socket so that SO_PEERCRED can report it.
4221 */
2f823ff8 4222 req->peer_secid = skp->smk_secid;
07feee8f
PM		 4223
4224 /*
4225 * We need to decide if we want to label the incoming connection here
4226 * if we do we only need to label the request_sock and the stack will
25985edc 4227 * propagate the wire-label to the sock when it is created.
07feee8f
PM		 4228 */
4229 hdr = ip_hdr(skb);
4230 addr.sin_addr.s_addr = hdr->saddr;
4231 rcu_read_lock();
21abb1ec 4232 hskp = smack_ipv4host_label(&addr);
f7112e6c
CS		 4233 rcu_read_unlock();
4234
21c7eae2 4235 if (hskp == NULL)
f7112e6c 4236 rc = netlbl_req_setattr(req, &skp->smk_netlabel);
2f823ff8 4237 else
07feee8f 4238 netlbl_req_delattr(req);
e114e473
CS		 4239
4240 return rc;
4241}
4242
07feee8f
PM		 4243/**
4244 * smack_inet_csk_clone - Copy the connection information to the new socket
4245 * @sk: the new socket
4246 * @req: the connection's request_sock
4247 *
4248 * Transfer the connection's peer label to the newly created socket.
4249 */
4250static void smack_inet_csk_clone(struct sock *sk,
4251 const struct request_sock *req)
4252{
4253 struct socket_smack *ssp = sk->sk_security;
2f823ff8 4254 struct smack_known *skp;
07feee8f 4255
2f823ff8
CS		 4256 if (req->peer_secid != 0) {
4257 skp = smack_from_secid(req->peer_secid);
54e70ec5 4258 ssp->smk_packet = skp;
2f823ff8 4259 } else
272cd7a8 4260 ssp->smk_packet = NULL;
07feee8f
PM		 4261}
4262
e114e473
CS		 4263/*
4264 * Key management security hooks
4265 *
4266 * Casey has not tested key support very heavily.
4267 * The permission check is most likely too restrictive.
4268 * If you care about keys please have a look.
4269 */
4270#ifdef CONFIG_KEYS
4271
4272/**
4273 * smack_key_alloc - Set the key security blob
4274 * @key: object
d84f4f99 4275 * @cred: the credentials to use
e114e473
CS		 4276 * @flags: unused
4277 *
4278 * No allocation required
4279 *
4280 * Returns 0
4281 */
d84f4f99 4282static int smack_key_alloc(struct key *key, const struct cred *cred,
e114e473
CS		 4283 unsigned long flags)
4284{
2f823ff8
CS		 4285 struct smack_known *skp = smk_of_task(cred->security);
4286
21c7eae2 4287 key->security = skp;
e114e473
CS		 4288 return 0;
4289}
4290
4291/**
4292 * smack_key_free - Clear the key security blob
4293 * @key: the object
4294 *
4295 * Clear the blob pointer
4296 */
4297static void smack_key_free(struct key *key)
4298{
4299 key->security = NULL;
4300}
4301
1a28979b 4302/**
e114e473
CS		 4303 * smack_key_permission - Smack access on a key
4304 * @key_ref: gets to the object
d84f4f99 4305 * @cred: the credentials to use
1a28979b 4306 * @perm: requested key permissions
e114e473
CS		 4307 *
4308 * Return 0 if the task has read and write to the object,
4309 * an error code otherwise
4310 */
4311static int smack_key_permission(key_ref_t key_ref,
f5895943 4312 const struct cred *cred, unsigned perm)
e114e473
CS		 4313{
4314 struct key *keyp;
ecfcc53f 4315 struct smk_audit_info ad;
2f823ff8 4316 struct smack_known *tkp = smk_of_task(cred->security);
fffea214 4317 int request = 0;
d166c802 4318 int rc;
e114e473
CS		 4319
4320 keyp = key_ref_to_ptr(key_ref);
4321 if (keyp == NULL)
4322 return -EINVAL;
4323 /*
4324 * If the key hasn't been initialized give it access so that
4325 * it may do so.
4326 */
4327 if (keyp->security == NULL)
4328 return 0;
4329 /*
4330 * This should not occur
4331 */
2f823ff8 4332 if (tkp == NULL)
e114e473 4333 return -EACCES;
ecfcc53f
EB		 4334#ifdef CONFIG_AUDIT
4335 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY);
4336 ad.a.u.key_struct.key = keyp->serial;
4337 ad.a.u.key_struct.key_desc = keyp->description;
4338#endif
fffea214
DK		 4339 if (perm & KEY_NEED_READ)
4340 request = MAY_READ;
4341 if (perm & (KEY_NEED_WRITE | KEY_NEED_LINK | KEY_NEED_SETATTR))
4342 request = MAY_WRITE;
d166c802
CS		 4343 rc = smk_access(tkp, keyp->security, request, &ad);
4344 rc = smk_bu_note("key access", tkp, keyp->security, request, rc);
4345 return rc;
e114e473 4346}
7fc5f36e
JB		 4347
4348/*
4349 * smack_key_getsecurity - Smack label tagging the key
4350 * @key points to the key to be queried
4351 * @_buffer points to a pointer that should be set to point to the
4352 * resulting string (if no label or an error occurs).
4353 * Return the length of the string (including terminating NUL) or -ve if
4354 * an error.
4355 * May also return 0 (and a NULL buffer pointer) if there is no label.
4356 */
4357static int smack_key_getsecurity(struct key *key, char **_buffer)
4358{
4359 struct smack_known *skp = key->security;
4360 size_t length;
4361 char *copy;
4362
4363 if (key->security == NULL) {
4364 *_buffer = NULL;
4365 return 0;
4366 }
4367
4368 copy = kstrdup(skp->smk_known, GFP_KERNEL);
4369 if (copy == NULL)
4370 return -ENOMEM;
4371 length = strlen(copy) + 1;
4372
4373 *_buffer = copy;
4374 return length;
4375}
4376
e114e473
CS		 4377#endif /* CONFIG_KEYS */
4378
d20bdda6
AD		 4379/*
4380 * Smack Audit hooks
4381 *
4382 * Audit requires a unique representation of each Smack specific
4383 * rule. This unique representation is used to distinguish the
4384 * object to be audited from remaining kernel objects and also
4385 * works as a glue between the audit hooks.
4386 *
4387 * Since repository entries are added but never deleted, we'll use
4388 * the smack_known label address related to the given audit rule as
4389 * the needed unique representation. This also better fits the smack
4390 * model where nearly everything is a label.
4391 */
4392#ifdef CONFIG_AUDIT
4393
4394/**
4395 * smack_audit_rule_init - Initialize a smack audit rule
4396 * @field: audit rule fields given from user-space (audit.h)
4397 * @op: required testing operator (=, !=, >, <, ...)
4398 * @rulestr: smack label to be audited
4399 * @vrule: pointer to save our own audit rule representation
4400 *
4401 * Prepare to audit cases where (@field @op @rulestr) is true.
4402 * The label to be audited is created if necessay.
4403 */
4404static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
4405{
21c7eae2 4406 struct smack_known *skp;
d20bdda6
AD		 4407 char **rule = (char **)vrule;
4408 *rule = NULL;
4409
4410 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
4411 return -EINVAL;
4412
5af75d8d 4413 if (op != Audit_equal && op != Audit_not_equal)
d20bdda6
AD		 4414 return -EINVAL;
4415
21c7eae2 4416 skp = smk_import_entry(rulestr, 0);
e774ad68
LP		 4417 if (IS_ERR(skp))
4418 return PTR_ERR(skp);
4419
4420 *rule = skp->smk_known;
d20bdda6
AD		 4421
4422 return 0;
4423}
4424
4425/**
4426 * smack_audit_rule_known - Distinguish Smack audit rules
4427 * @krule: rule of interest, in Audit kernel representation format
4428 *
4429 * This is used to filter Smack rules from remaining Audit ones.
4430 * If it's proved that this rule belongs to us, the
4431 * audit_rule_match hook will be called to do the final judgement.
4432 */
4433static int smack_audit_rule_known(struct audit_krule *krule)
4434{
4435 struct audit_field *f;
4436 int i;
4437
4438 for (i = 0; i < krule->field_count; i++) {
4439 f = &krule->fields[i];
4440
4441 if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER)
4442 return 1;
4443 }
4444
4445 return 0;
4446}
4447
4448/**
4449 * smack_audit_rule_match - Audit given object ?
4450 * @secid: security id for identifying the object to test
4451 * @field: audit rule flags given from user-space
4452 * @op: required testing operator
4453 * @vrule: smack internal rule presentation
4454 * @actx: audit context associated with the check
4455 *
4456 * The core Audit hook. It's used to take the decision of
4457 * whether to audit or not to audit a given object.
4458 */
4459static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule,
4460 struct audit_context *actx)
4461{
2f823ff8 4462 struct smack_known *skp;
d20bdda6
AD		 4463 char *rule = vrule;
4464
4eb0f4ab
RGB		 4465 if (unlikely(!rule)) {
4466 WARN_ONCE(1, "Smack: missing rule\n");
d20bdda6
AD		 4467 return -ENOENT;
4468 }
4469
4470 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
4471 return 0;
4472
2f823ff8 4473 skp = smack_from_secid(secid);
d20bdda6
AD		 4474
4475 /*
4476 * No need to do string comparisons. If a match occurs,
4477 * both pointers will point to the same smack_known
4478 * label.
4479 */
5af75d8d 4480 if (op == Audit_equal)
2f823ff8 4481 return (rule == skp->smk_known);
5af75d8d 4482 if (op == Audit_not_equal)
2f823ff8 4483 return (rule != skp->smk_known);
d20bdda6
AD		 4484
4485 return 0;
4486}
4487
4488/**
4489 * smack_audit_rule_free - free smack rule representation
4490 * @vrule: rule to be freed.
4491 *
4492 * No memory was allocated.
4493 */
4494static void smack_audit_rule_free(void *vrule)
4495{
4496 /* No-op */
4497}
4498
4499#endif /* CONFIG_AUDIT */
4500
746df9b5
DQ		 4501/**
4502 * smack_ismaclabel - check if xattr @name references a smack MAC label
4503 * @name: Full xattr name to check.
4504 */
4505static int smack_ismaclabel(const char *name)
4506{
4507 return (strcmp(name, XATTR_SMACK_SUFFIX) == 0);
4508}
4509
4510
251a2a95 4511/**
e114e473
CS		 4512 * smack_secid_to_secctx - return the smack label for a secid
4513 * @secid: incoming integer
4514 * @secdata: destination
4515 * @seclen: how long it is
4516 *
4517 * Exists for networking code.
4518 */
4519static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
4520{
2f823ff8 4521 struct smack_known *skp = smack_from_secid(secid);
e114e473 4522
d5630b9d 4523 if (secdata)
2f823ff8
CS		 4524 *secdata = skp->smk_known;
4525 *seclen = strlen(skp->smk_known);
e114e473
CS		 4526 return 0;
4527}
4528
251a2a95 4529/**
4bc87e62
CS		 4530 * smack_secctx_to_secid - return the secid for a smack label
4531 * @secdata: smack label
4532 * @seclen: how long result is
4533 * @secid: outgoing integer
4534 *
4535 * Exists for audit and networking code.
4536 */
e52c1764 4537static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
4bc87e62 4538{
21c7eae2
LP		 4539 struct smack_known *skp = smk_find_entry(secdata);
4540
4541 if (skp)
4542 *secid = skp->smk_secid;
4543 else
4544 *secid = 0;
4bc87e62
CS		 4545 return 0;
4546}
4547
251a2a95 4548/**
e114e473 4549 * smack_release_secctx - don't do anything.
251a2a95
RD		 4550 * @secdata: unused
4551 * @seclen: unused
e114e473
CS		 4552 *
4553 * Exists to make sure nothing gets done, and properly
4554 */
4555static void smack_release_secctx(char *secdata, u32 seclen)
4556{
4557}
4558
1ee65e37
DQ		 4559static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
4560{
4561 return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0);
4562}
4563
4564static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
4565{
4566 return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0);
4567}
4568
4569static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
4570{
4571 int len = 0;
4572 len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true);
4573
4574 if (len < 0)
4575 return len;
4576 *ctxlen = len;
4577 return 0;
4578}
4579
1eddfe8e 4580static struct security_hook_list smack_hooks[] = {
e20b043a
CS		 4581 LSM_HOOK_INIT(ptrace_access_check, smack_ptrace_access_check),
4582 LSM_HOOK_INIT(ptrace_traceme, smack_ptrace_traceme),
4583 LSM_HOOK_INIT(syslog, smack_syslog),
4584
4585 LSM_HOOK_INIT(sb_alloc_security, smack_sb_alloc_security),
4586 LSM_HOOK_INIT(sb_free_security, smack_sb_free_security),
4587 LSM_HOOK_INIT(sb_copy_data, smack_sb_copy_data),
4588 LSM_HOOK_INIT(sb_kern_mount, smack_sb_kern_mount),
4589 LSM_HOOK_INIT(sb_statfs, smack_sb_statfs),
3bf2789c
VT		 4590 LSM_HOOK_INIT(sb_set_mnt_opts, smack_set_mnt_opts),
4591 LSM_HOOK_INIT(sb_parse_opts_str, smack_parse_opts_str),
e20b043a
CS		 4592
4593 LSM_HOOK_INIT(bprm_set_creds, smack_bprm_set_creds),
4594 LSM_HOOK_INIT(bprm_committing_creds, smack_bprm_committing_creds),
4595 LSM_HOOK_INIT(bprm_secureexec, smack_bprm_secureexec),
4596
4597 LSM_HOOK_INIT(inode_alloc_security, smack_inode_alloc_security),
4598 LSM_HOOK_INIT(inode_free_security, smack_inode_free_security),
4599 LSM_HOOK_INIT(inode_init_security, smack_inode_init_security),
4600 LSM_HOOK_INIT(inode_link, smack_inode_link),
4601 LSM_HOOK_INIT(inode_unlink, smack_inode_unlink),
4602 LSM_HOOK_INIT(inode_rmdir, smack_inode_rmdir),
4603 LSM_HOOK_INIT(inode_rename, smack_inode_rename),
4604 LSM_HOOK_INIT(inode_permission, smack_inode_permission),
4605 LSM_HOOK_INIT(inode_setattr, smack_inode_setattr),
4606 LSM_HOOK_INIT(inode_getattr, smack_inode_getattr),
4607 LSM_HOOK_INIT(inode_setxattr, smack_inode_setxattr),
4608 LSM_HOOK_INIT(inode_post_setxattr, smack_inode_post_setxattr),
4609 LSM_HOOK_INIT(inode_getxattr, smack_inode_getxattr),
4610 LSM_HOOK_INIT(inode_removexattr, smack_inode_removexattr),
4611 LSM_HOOK_INIT(inode_getsecurity, smack_inode_getsecurity),
4612 LSM_HOOK_INIT(inode_setsecurity, smack_inode_setsecurity),
4613 LSM_HOOK_INIT(inode_listsecurity, smack_inode_listsecurity),
4614 LSM_HOOK_INIT(inode_getsecid, smack_inode_getsecid),
4615
4616 LSM_HOOK_INIT(file_permission, smack_file_permission),
4617 LSM_HOOK_INIT(file_alloc_security, smack_file_alloc_security),
4618 LSM_HOOK_INIT(file_free_security, smack_file_free_security),
4619 LSM_HOOK_INIT(file_ioctl, smack_file_ioctl),
4620 LSM_HOOK_INIT(file_lock, smack_file_lock),
4621 LSM_HOOK_INIT(file_fcntl, smack_file_fcntl),
4622 LSM_HOOK_INIT(mmap_file, smack_mmap_file),
4623 LSM_HOOK_INIT(mmap_addr, cap_mmap_addr),
4624 LSM_HOOK_INIT(file_set_fowner, smack_file_set_fowner),
4625 LSM_HOOK_INIT(file_send_sigiotask, smack_file_send_sigiotask),
4626 LSM_HOOK_INIT(file_receive, smack_file_receive),
4627
4628 LSM_HOOK_INIT(file_open, smack_file_open),
4629
4630 LSM_HOOK_INIT(cred_alloc_blank, smack_cred_alloc_blank),
4631 LSM_HOOK_INIT(cred_free, smack_cred_free),
4632 LSM_HOOK_INIT(cred_prepare, smack_cred_prepare),
4633 LSM_HOOK_INIT(cred_transfer, smack_cred_transfer),
4634 LSM_HOOK_INIT(kernel_act_as, smack_kernel_act_as),
4635 LSM_HOOK_INIT(kernel_create_files_as, smack_kernel_create_files_as),
4636 LSM_HOOK_INIT(task_setpgid, smack_task_setpgid),
4637 LSM_HOOK_INIT(task_getpgid, smack_task_getpgid),
4638 LSM_HOOK_INIT(task_getsid, smack_task_getsid),
4639 LSM_HOOK_INIT(task_getsecid, smack_task_getsecid),
4640 LSM_HOOK_INIT(task_setnice, smack_task_setnice),
4641 LSM_HOOK_INIT(task_setioprio, smack_task_setioprio),
4642 LSM_HOOK_INIT(task_getioprio, smack_task_getioprio),
4643 LSM_HOOK_INIT(task_setscheduler, smack_task_setscheduler),
4644 LSM_HOOK_INIT(task_getscheduler, smack_task_getscheduler),
4645 LSM_HOOK_INIT(task_movememory, smack_task_movememory),
4646 LSM_HOOK_INIT(task_kill, smack_task_kill),
4647 LSM_HOOK_INIT(task_wait, smack_task_wait),
4648 LSM_HOOK_INIT(task_to_inode, smack_task_to_inode),
4649
4650 LSM_HOOK_INIT(ipc_permission, smack_ipc_permission),
4651 LSM_HOOK_INIT(ipc_getsecid, smack_ipc_getsecid),
4652
4653 LSM_HOOK_INIT(msg_msg_alloc_security, smack_msg_msg_alloc_security),
4654 LSM_HOOK_INIT(msg_msg_free_security, smack_msg_msg_free_security),
4655
4656 LSM_HOOK_INIT(msg_queue_alloc_security, smack_msg_queue_alloc_security),
4657 LSM_HOOK_INIT(msg_queue_free_security, smack_msg_queue_free_security),
4658 LSM_HOOK_INIT(msg_queue_associate, smack_msg_queue_associate),
4659 LSM_HOOK_INIT(msg_queue_msgctl, smack_msg_queue_msgctl),
4660 LSM_HOOK_INIT(msg_queue_msgsnd, smack_msg_queue_msgsnd),
4661 LSM_HOOK_INIT(msg_queue_msgrcv, smack_msg_queue_msgrcv),
4662
4663 LSM_HOOK_INIT(shm_alloc_security, smack_shm_alloc_security),
4664 LSM_HOOK_INIT(shm_free_security, smack_shm_free_security),
4665 LSM_HOOK_INIT(shm_associate, smack_shm_associate),
4666 LSM_HOOK_INIT(shm_shmctl, smack_shm_shmctl),
4667 LSM_HOOK_INIT(shm_shmat, smack_shm_shmat),
4668
4669 LSM_HOOK_INIT(sem_alloc_security, smack_sem_alloc_security),
4670 LSM_HOOK_INIT(sem_free_security, smack_sem_free_security),
4671 LSM_HOOK_INIT(sem_associate, smack_sem_associate),
4672 LSM_HOOK_INIT(sem_semctl, smack_sem_semctl),
4673 LSM_HOOK_INIT(sem_semop, smack_sem_semop),
4674
4675 LSM_HOOK_INIT(d_instantiate, smack_d_instantiate),
4676
4677 LSM_HOOK_INIT(getprocattr, smack_getprocattr),
4678 LSM_HOOK_INIT(setprocattr, smack_setprocattr),
4679
4680 LSM_HOOK_INIT(unix_stream_connect, smack_unix_stream_connect),
4681 LSM_HOOK_INIT(unix_may_send, smack_unix_may_send),
4682
4683 LSM_HOOK_INIT(socket_post_create, smack_socket_post_create),
21abb1ec 4684#ifdef SMACK_IPV6_PORT_LABELING
e20b043a 4685 LSM_HOOK_INIT(socket_bind, smack_socket_bind),
21abb1ec 4686#endif
e20b043a
CS		 4687 LSM_HOOK_INIT(socket_connect, smack_socket_connect),
4688 LSM_HOOK_INIT(socket_sendmsg, smack_socket_sendmsg),
4689 LSM_HOOK_INIT(socket_sock_rcv_skb, smack_socket_sock_rcv_skb),
4690 LSM_HOOK_INIT(socket_getpeersec_stream, smack_socket_getpeersec_stream),
4691 LSM_HOOK_INIT(socket_getpeersec_dgram, smack_socket_getpeersec_dgram),
4692 LSM_HOOK_INIT(sk_alloc_security, smack_sk_alloc_security),
4693 LSM_HOOK_INIT(sk_free_security, smack_sk_free_security),
4694 LSM_HOOK_INIT(sock_graft, smack_sock_graft),
4695 LSM_HOOK_INIT(inet_conn_request, smack_inet_conn_request),
4696 LSM_HOOK_INIT(inet_csk_clone, smack_inet_csk_clone),
d20bdda6 4697
e114e473
CS		 4698 /* key management security hooks */
4699#ifdef CONFIG_KEYS
e20b043a
CS		 4700 LSM_HOOK_INIT(key_alloc, smack_key_alloc),
4701 LSM_HOOK_INIT(key_free, smack_key_free),
4702 LSM_HOOK_INIT(key_permission, smack_key_permission),
4703 LSM_HOOK_INIT(key_getsecurity, smack_key_getsecurity),
e114e473 4704#endif /* CONFIG_KEYS */
d20bdda6
AD		 4705
4706 /* Audit hooks */
4707#ifdef CONFIG_AUDIT
e20b043a
CS		 4708 LSM_HOOK_INIT(audit_rule_init, smack_audit_rule_init),
4709 LSM_HOOK_INIT(audit_rule_known, smack_audit_rule_known),
4710 LSM_HOOK_INIT(audit_rule_match, smack_audit_rule_match),
4711 LSM_HOOK_INIT(audit_rule_free, smack_audit_rule_free),
d20bdda6
AD		 4712#endif /* CONFIG_AUDIT */
4713
e20b043a
CS		 4714 LSM_HOOK_INIT(ismaclabel, smack_ismaclabel),
4715 LSM_HOOK_INIT(secid_to_secctx, smack_secid_to_secctx),
4716 LSM_HOOK_INIT(secctx_to_secid, smack_secctx_to_secid),
4717 LSM_HOOK_INIT(release_secctx, smack_release_secctx),
4718 LSM_HOOK_INIT(inode_notifysecctx, smack_inode_notifysecctx),
4719 LSM_HOOK_INIT(inode_setsecctx, smack_inode_setsecctx),
4720 LSM_HOOK_INIT(inode_getsecctx, smack_inode_getsecctx),
e114e473
CS		 4721};
4722
7198e2ee 4723
86812bb0 4724static __init void init_smack_known_list(void)
7198e2ee 4725{
86812bb0
CS		 4726 /*
4727 * Initialize rule list locks
4728 */
4729 mutex_init(&smack_known_huh.smk_rules_lock);
4730 mutex_init(&smack_known_hat.smk_rules_lock);
4731 mutex_init(&smack_known_floor.smk_rules_lock);
4732 mutex_init(&smack_known_star.smk_rules_lock);
4733 mutex_init(&smack_known_invalid.smk_rules_lock);
4734 mutex_init(&smack_known_web.smk_rules_lock);
4735 /*
4736 * Initialize rule lists
4737 */
4738 INIT_LIST_HEAD(&smack_known_huh.smk_rules);
4739 INIT_LIST_HEAD(&smack_known_hat.smk_rules);
4740 INIT_LIST_HEAD(&smack_known_star.smk_rules);
4741 INIT_LIST_HEAD(&smack_known_floor.smk_rules);
4742 INIT_LIST_HEAD(&smack_known_invalid.smk_rules);
4743 INIT_LIST_HEAD(&smack_known_web.smk_rules);
4744 /*
4745 * Create the known labels list
4746 */
4d7cf4a1
TS		 4747 smk_insert_entry(&smack_known_huh);
4748 smk_insert_entry(&smack_known_hat);
4749 smk_insert_entry(&smack_known_star);
4750 smk_insert_entry(&smack_known_floor);
4751 smk_insert_entry(&smack_known_invalid);
4752 smk_insert_entry(&smack_known_web);
7198e2ee
EB		 4753}
4754
e114e473
CS		 4755/**
4756 * smack_init - initialize the smack system
4757 *
4758 * Returns 0
4759 */
4760static __init int smack_init(void)
4761{
d84f4f99 4762 struct cred *cred;
676dac4b 4763 struct task_smack *tsp;
d84f4f99 4764
b1d9e6b0 4765 if (!security_module_enable("smack"))
7898e1f8
CS		 4766 return 0;
4767
1a5b472b
R		 4768 smack_inode_cache = KMEM_CACHE(inode_smack, 0);
4769 if (!smack_inode_cache)
4770 return -ENOMEM;
4771
2f823ff8
CS		 4772 tsp = new_task_smack(&smack_known_floor, &smack_known_floor,
4773 GFP_KERNEL);
1a5b472b
R		 4774 if (tsp == NULL) {
4775 kmem_cache_destroy(smack_inode_cache);
676dac4b 4776 return -ENOMEM;
1a5b472b 4777 }
676dac4b 4778
d21b7b04
JB		 4779 smack_enabled = 1;
4780
21abb1ec
CS		 4781 pr_info("Smack: Initializing.\n");
4782#ifdef CONFIG_SECURITY_SMACK_NETFILTER
4783 pr_info("Smack: Netfilter enabled.\n");
4784#endif
4785#ifdef SMACK_IPV6_PORT_LABELING
4786 pr_info("Smack: IPv6 port labeling enabled.\n");
4787#endif
4788#ifdef SMACK_IPV6_SECMARK_LABELING
4789 pr_info("Smack: IPv6 Netfilter enabled.\n");
4790#endif
e114e473
CS		 4791
4792 /*
4793 * Set the security state for the initial task.
4794 */
d84f4f99 4795 cred = (struct cred *) current->cred;
676dac4b 4796 cred->security = tsp;
e114e473 4797
86812bb0
CS		 4798 /* initialize the smack_known_list */
4799 init_smack_known_list();
e114e473
CS		 4800
4801 /*
4802 * Register with LSM
4803 */
b1d9e6b0 4804 security_add_hooks(smack_hooks, ARRAY_SIZE(smack_hooks));
e114e473
CS		 4805
4806 return 0;
4807}
4808
4809/*
4810 * Smack requires early initialization in order to label
4811 * all processes and objects when they are created.
4812 */
4813security_initcall(smack_init);
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