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ACPICA: iASL: Fix some typos with the name strtoul64
[deliverable/linux.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{
3dfb7d8c 401 if (mode & PTRACE_MODE_ATTACH)
5663884c 402 return MAY_READWRITE;
3dfb7d8c
JH		 403 if (mode & PTRACE_MODE_READ)
404 return MAY_READ;
5663884c
LP		 405
406 return 0;
407}
408
409/**
410 * smk_ptrace_rule_check - helper for ptrace access
411 * @tracer: tracer process
21c7eae2 412 * @tracee_known: label entry of the process that's about to be traced
5663884c
LP		 413 * @mode: ptrace attachment mode (PTRACE_MODE_*)
414 * @func: name of the function that called us, used for audit
415 *
416 * Returns 0 on access granted, -error on error
417 */
21c7eae2
LP		 418static int smk_ptrace_rule_check(struct task_struct *tracer,
419 struct smack_known *tracee_known,
5663884c
LP		 420 unsigned int mode, const char *func)
421{
422 int rc;
423 struct smk_audit_info ad, *saip = NULL;
424 struct task_smack *tsp;
21c7eae2 425 struct smack_known *tracer_known;
5663884c
LP		 426
427 if ((mode & PTRACE_MODE_NOAUDIT) == 0) {
428 smk_ad_init(&ad, func, LSM_AUDIT_DATA_TASK);
429 smk_ad_setfield_u_tsk(&ad, tracer);
430 saip = &ad;
431 }
432
6d1cff2a
AR		 433 rcu_read_lock();
434 tsp = __task_cred(tracer)->security;
21c7eae2 435 tracer_known = smk_of_task(tsp);
5663884c 436
66867818
LP		 437 if ((mode & PTRACE_MODE_ATTACH) &&
438 (smack_ptrace_rule == SMACK_PTRACE_EXACT ||
439 smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)) {
21c7eae2 440 if (tracer_known->smk_known == tracee_known->smk_known)
66867818
LP		 441 rc = 0;
442 else if (smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)
443 rc = -EACCES;
444 else if (capable(CAP_SYS_PTRACE))
445 rc = 0;
446 else
447 rc = -EACCES;
448
449 if (saip)
21c7eae2
LP		 450 smack_log(tracer_known->smk_known,
451 tracee_known->smk_known,
452 0, rc, saip);
66867818 453
6d1cff2a 454 rcu_read_unlock();
66867818
LP		 455 return rc;
456 }
457
458 /* In case of rule==SMACK_PTRACE_DEFAULT or mode==PTRACE_MODE_READ */
21c7eae2 459 rc = smk_tskacc(tsp, tracee_known, smk_ptrace_mode(mode), saip);
6d1cff2a
AR		 460
461 rcu_read_unlock();
5663884c
LP		 462 return rc;
463}
464
e114e473
CS		 465/*
466 * LSM hooks.
467 * We he, that is fun!
468 */
469
470/**
9e48858f 471 * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH
e114e473 472 * @ctp: child task pointer
5663884c 473 * @mode: ptrace attachment mode (PTRACE_MODE_*)
e114e473
CS		 474 *
475 * Returns 0 if access is OK, an error code otherwise
476 *
5663884c 477 * Do the capability checks.
e114e473 478 */
9e48858f 479static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode)
e114e473 480{
2f823ff8 481 struct smack_known *skp;
e114e473 482
6d1cff2a 483 skp = smk_of_task_struct(ctp);
ecfcc53f 484
b1d9e6b0 485 return smk_ptrace_rule_check(current, skp, mode, __func__);
5cd9c58f
DH		 486}
487
488/**
489 * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
490 * @ptp: parent task pointer
491 *
492 * Returns 0 if access is OK, an error code otherwise
493 *
5663884c 494 * Do the capability checks, and require PTRACE_MODE_ATTACH.
5cd9c58f
DH		 495 */
496static int smack_ptrace_traceme(struct task_struct *ptp)
497{
498 int rc;
2f823ff8 499 struct smack_known *skp;
5cd9c58f 500
959e6c7f 501 skp = smk_of_task(current_security());
ecfcc53f 502
21c7eae2 503 rc = smk_ptrace_rule_check(ptp, skp, PTRACE_MODE_ATTACH, __func__);
e114e473
CS		 504 return rc;
505}
506
507/**
508 * smack_syslog - Smack approval on syslog
509 * @type: message type
510 *
e114e473
CS		 511 * Returns 0 on success, error code otherwise.
512 */
12b3052c 513static int smack_syslog(int typefrom_file)
e114e473 514{
12b3052c 515 int rc = 0;
2f823ff8 516 struct smack_known *skp = smk_of_current();
e114e473 517
1880eff7 518 if (smack_privileged(CAP_MAC_OVERRIDE))
e114e473
CS		 519 return 0;
520
24ea1b6e 521 if (smack_syslog_label != NULL && smack_syslog_label != skp)
e114e473
CS		 522 rc = -EACCES;
523
524 return rc;
525}
526
527
528/*
529 * Superblock Hooks.
530 */
531
532/**
533 * smack_sb_alloc_security - allocate a superblock blob
534 * @sb: the superblock getting the blob
535 *
536 * Returns 0 on success or -ENOMEM on error.
537 */
538static int smack_sb_alloc_security(struct super_block *sb)
539{
540 struct superblock_smack *sbsp;
541
542 sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL);
543
544 if (sbsp == NULL)
545 return -ENOMEM;
546
21c7eae2
LP		 547 sbsp->smk_root = &smack_known_floor;
548 sbsp->smk_default = &smack_known_floor;
549 sbsp->smk_floor = &smack_known_floor;
550 sbsp->smk_hat = &smack_known_hat;
e830b394
CS		 551 /*
552 * smk_initialized will be zero from kzalloc.
553 */
e114e473
CS		 554 sb->s_security = sbsp;
555
556 return 0;
557}
558
559/**
560 * smack_sb_free_security - free a superblock blob
561 * @sb: the superblock getting the blob
562 *
563 */
564static void smack_sb_free_security(struct super_block *sb)
565{
566 kfree(sb->s_security);
567 sb->s_security = NULL;
568}
569
570/**
571 * smack_sb_copy_data - copy mount options data for processing
e114e473 572 * @orig: where to start
251a2a95 573 * @smackopts: mount options string
e114e473
CS		 574 *
575 * Returns 0 on success or -ENOMEM on error.
576 *
577 * Copy the Smack specific mount options out of the mount
578 * options list.
579 */
e0007529 580static int smack_sb_copy_data(char *orig, char *smackopts)
e114e473
CS		 581{
582 char *cp, *commap, *otheropts, *dp;
583
e114e473
CS		 584 otheropts = (char *)get_zeroed_page(GFP_KERNEL);
585 if (otheropts == NULL)
586 return -ENOMEM;
587
588 for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) {
589 if (strstr(cp, SMK_FSDEFAULT) == cp)
590 dp = smackopts;
591 else if (strstr(cp, SMK_FSFLOOR) == cp)
592 dp = smackopts;
593 else if (strstr(cp, SMK_FSHAT) == cp)
594 dp = smackopts;
595 else if (strstr(cp, SMK_FSROOT) == cp)
596 dp = smackopts;
e830b394
CS		 597 else if (strstr(cp, SMK_FSTRANS) == cp)
598 dp = smackopts;
e114e473
CS		 599 else
600 dp = otheropts;
601
602 commap = strchr(cp, ',');
603 if (commap != NULL)
604 *commap = '\0';
605
606 if (*dp != '\0')
607 strcat(dp, ",");
608 strcat(dp, cp);
609 }
610
611 strcpy(orig, otheropts);
612 free_page((unsigned long)otheropts);
613
614 return 0;
615}
616
617/**
3bf2789c
VT		 618 * smack_parse_opts_str - parse Smack specific mount options
619 * @options: mount options string
620 * @opts: where to store converted mount opts
621 *
622 * Returns 0 on success or -ENOMEM on error.
623 *
624 * converts Smack specific mount options to generic security option format
625 */
626static int smack_parse_opts_str(char *options,
627 struct security_mnt_opts *opts)
628{
629 char *p;
3d04c924
CS		 630 char *fsdefault = NULL;
631 char *fsfloor = NULL;
632 char *fshat = NULL;
633 char *fsroot = NULL;
634 char *fstransmute = NULL;
635 int rc = -ENOMEM;
636 int num_mnt_opts = 0;
637 int token;
3bf2789c
VT		 638
639 opts->num_mnt_opts = 0;
640
641 if (!options)
642 return 0;
643
644 while ((p = strsep(&options, ",")) != NULL) {
3bf2789c
VT		 645 substring_t args[MAX_OPT_ARGS];
646
647 if (!*p)
648 continue;
649
3d04c924 650 token = match_token(p, smk_mount_tokens, args);
3bf2789c
VT		 651
652 switch (token) {
653 case Opt_fsdefault:
654 if (fsdefault)
655 goto out_opt_err;
656 fsdefault = match_strdup(&args[0]);
657 if (!fsdefault)
658 goto out_err;
659 break;
660 case Opt_fsfloor:
661 if (fsfloor)
662 goto out_opt_err;
663 fsfloor = match_strdup(&args[0]);
664 if (!fsfloor)
665 goto out_err;
666 break;
667 case Opt_fshat:
668 if (fshat)
669 goto out_opt_err;
670 fshat = match_strdup(&args[0]);
671 if (!fshat)
672 goto out_err;
673 break;
674 case Opt_fsroot:
675 if (fsroot)
676 goto out_opt_err;
677 fsroot = match_strdup(&args[0]);
678 if (!fsroot)
679 goto out_err;
680 break;
681 case Opt_fstransmute:
682 if (fstransmute)
683 goto out_opt_err;
684 fstransmute = match_strdup(&args[0]);
685 if (!fstransmute)
686 goto out_err;
687 break;
688 default:
689 rc = -EINVAL;
690 pr_warn("Smack: unknown mount option\n");
691 goto out_err;
692 }
693 }
694
695 opts->mnt_opts = kcalloc(NUM_SMK_MNT_OPTS, sizeof(char *), GFP_ATOMIC);
696 if (!opts->mnt_opts)
697 goto out_err;
698
699 opts->mnt_opts_flags = kcalloc(NUM_SMK_MNT_OPTS, sizeof(int),
700 GFP_ATOMIC);
701 if (!opts->mnt_opts_flags) {
702 kfree(opts->mnt_opts);
703 goto out_err;
704 }
705
706 if (fsdefault) {
707 opts->mnt_opts[num_mnt_opts] = fsdefault;
708 opts->mnt_opts_flags[num_mnt_opts++] = FSDEFAULT_MNT;
709 }
710 if (fsfloor) {
711 opts->mnt_opts[num_mnt_opts] = fsfloor;
712 opts->mnt_opts_flags[num_mnt_opts++] = FSFLOOR_MNT;
713 }
714 if (fshat) {
715 opts->mnt_opts[num_mnt_opts] = fshat;
716 opts->mnt_opts_flags[num_mnt_opts++] = FSHAT_MNT;
717 }
718 if (fsroot) {
719 opts->mnt_opts[num_mnt_opts] = fsroot;
720 opts->mnt_opts_flags[num_mnt_opts++] = FSROOT_MNT;
721 }
722 if (fstransmute) {
723 opts->mnt_opts[num_mnt_opts] = fstransmute;
724 opts->mnt_opts_flags[num_mnt_opts++] = FSTRANS_MNT;
725 }
726
727 opts->num_mnt_opts = num_mnt_opts;
728 return 0;
729
730out_opt_err:
731 rc = -EINVAL;
732 pr_warn("Smack: duplicate mount options\n");
733
734out_err:
735 kfree(fsdefault);
736 kfree(fsfloor);
737 kfree(fshat);
738 kfree(fsroot);
739 kfree(fstransmute);
740 return rc;
741}
742
743/**
744 * smack_set_mnt_opts - set Smack specific mount options
e114e473 745 * @sb: the file system superblock
3bf2789c
VT		 746 * @opts: Smack mount options
747 * @kern_flags: mount option from kernel space or user space
748 * @set_kern_flags: where to store converted mount opts
e114e473
CS		 749 *
750 * Returns 0 on success, an error code on failure
3bf2789c
VT		 751 *
752 * Allow filesystems with binary mount data to explicitly set Smack mount
753 * labels.
e114e473 754 */
3bf2789c
VT		 755static int smack_set_mnt_opts(struct super_block *sb,
756 struct security_mnt_opts *opts,
757 unsigned long kern_flags,
758 unsigned long *set_kern_flags)
e114e473
CS		 759{
760 struct dentry *root = sb->s_root;
c6f493d6 761 struct inode *inode = d_backing_inode(root);
e114e473
CS		 762 struct superblock_smack *sp = sb->s_security;
763 struct inode_smack *isp;
24ea1b6e 764 struct smack_known *skp;
3bf2789c
VT		 765 int i;
766 int num_opts = opts->num_mnt_opts;
e830b394 767 int transmute = 0;
e114e473 768
e830b394 769 if (sp->smk_initialized)
e114e473 770 return 0;
eb982cb4 771
e114e473 772 sp->smk_initialized = 1;
e114e473 773
3bf2789c
VT		 774 for (i = 0; i < num_opts; i++) {
775 switch (opts->mnt_opts_flags[i]) {
776 case FSDEFAULT_MNT:
777 skp = smk_import_entry(opts->mnt_opts[i], 0);
e774ad68
LP		 778 if (IS_ERR(skp))
779 return PTR_ERR(skp);
3bf2789c
VT		 780 sp->smk_default = skp;
781 break;
782 case FSFLOOR_MNT:
783 skp = smk_import_entry(opts->mnt_opts[i], 0);
e774ad68
LP		 784 if (IS_ERR(skp))
785 return PTR_ERR(skp);
786 sp->smk_floor = skp;
3bf2789c
VT		 787 break;
788 case FSHAT_MNT:
789 skp = smk_import_entry(opts->mnt_opts[i], 0);
e774ad68
LP		 790 if (IS_ERR(skp))
791 return PTR_ERR(skp);
3bf2789c
VT		 792 sp->smk_hat = skp;
793 break;
794 case FSROOT_MNT:
795 skp = smk_import_entry(opts->mnt_opts[i], 0);
e774ad68
LP		 796 if (IS_ERR(skp))
797 return PTR_ERR(skp);
798 sp->smk_root = skp;
3bf2789c
VT		 799 break;
800 case FSTRANS_MNT:
801 skp = smk_import_entry(opts->mnt_opts[i], 0);
e774ad68
LP		 802 if (IS_ERR(skp))
803 return PTR_ERR(skp);
804 sp->smk_root = skp;
805 transmute = 1;
3bf2789c
VT		 806 break;
807 default:
808 break;
e114e473
CS		 809 }
810 }
811
24ea1b6e
CS		 812 if (!smack_privileged(CAP_MAC_ADMIN)) {
813 /*
814 * Unprivileged mounts don't get to specify Smack values.
815 */
3bf2789c 816 if (num_opts)
24ea1b6e
CS		 817 return -EPERM;
818 /*
819 * Unprivileged mounts get root and default from the caller.
820 */
821 skp = smk_of_current();
21c7eae2
LP		 822 sp->smk_root = skp;
823 sp->smk_default = skp;
24ea1b6e 824 }
3bf2789c 825
e114e473
CS		 826 /*
827 * Initialize the root inode.
828 */
829 isp = inode->i_security;
55dfc5da
JB		 830 if (isp == NULL) {
831 isp = new_inode_smack(sp->smk_root);
832 if (isp == NULL)
833 return -ENOMEM;
834 inode->i_security = isp;
e830b394 835 } else
e114e473
CS		 836 isp->smk_inode = sp->smk_root;
837
e830b394
CS		 838 if (transmute)
839 isp->smk_flags |= SMK_INODE_TRANSMUTE;
840
e114e473
CS		 841 return 0;
842}
843
3bf2789c
VT		 844/**
845 * smack_sb_kern_mount - Smack specific mount processing
846 * @sb: the file system superblock
847 * @flags: the mount flags
848 * @data: the smack mount options
849 *
850 * Returns 0 on success, an error code on failure
851 */
852static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data)
853{
854 int rc = 0;
855 char *options = data;
856 struct security_mnt_opts opts;
857
858 security_init_mnt_opts(&opts);
859
860 if (!options)
861 goto out;
862
863 rc = smack_parse_opts_str(options, &opts);
864 if (rc)
865 goto out_err;
866
867out:
868 rc = smack_set_mnt_opts(sb, &opts, 0, NULL);
869
870out_err:
871 security_free_mnt_opts(&opts);
872 return rc;
873}
874
e114e473
CS		 875/**
876 * smack_sb_statfs - Smack check on statfs
877 * @dentry: identifies the file system in question
878 *
879 * Returns 0 if current can read the floor of the filesystem,
880 * and error code otherwise
881 */
882static int smack_sb_statfs(struct dentry *dentry)
883{
884 struct superblock_smack *sbp = dentry->d_sb->s_security;
ecfcc53f
EB		 885 int rc;
886 struct smk_audit_info ad;
887
a269434d 888 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
ecfcc53f 889 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
e114e473 890
ecfcc53f 891 rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad);
d166c802 892 rc = smk_bu_current("statfs", sbp->smk_floor, MAY_READ, rc);
ecfcc53f 893 return rc;
e114e473
CS		 894}
895
676dac4b
CS		 896/*
897 * BPRM hooks
898 */
899
ce8a4321
CS		 900/**
901 * smack_bprm_set_creds - set creds for exec
902 * @bprm: the exec information
903 *
5663884c 904 * Returns 0 if it gets a blob, -EPERM if exec forbidden and -ENOMEM otherwise
ce8a4321 905 */
676dac4b
CS		 906static int smack_bprm_set_creds(struct linux_binprm *bprm)
907{
496ad9aa 908 struct inode *inode = file_inode(bprm->file);
84088ba2 909 struct task_smack *bsp = bprm->cred->security;
676dac4b 910 struct inode_smack *isp;
676dac4b
CS		 911 int rc;
912
676dac4b
CS		 913 if (bprm->cred_prepared)
914 return 0;
915
84088ba2
JS		 916 isp = inode->i_security;
917 if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task)
676dac4b
CS		 918 return 0;
919
5663884c
LP		 920 if (bprm->unsafe & (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) {
921 struct task_struct *tracer;
922 rc = 0;
923
924 rcu_read_lock();
925 tracer = ptrace_parent(current);
926 if (likely(tracer != NULL))
927 rc = smk_ptrace_rule_check(tracer,
21c7eae2 928 isp->smk_task,
5663884c
LP		 929 PTRACE_MODE_ATTACH,
930 __func__);
931 rcu_read_unlock();
932
933 if (rc != 0)
934 return rc;
935 } else if (bprm->unsafe)
84088ba2 936 return -EPERM;
676dac4b 937
84088ba2
JS		 938 bsp->smk_task = isp->smk_task;
939 bprm->per_clear |= PER_CLEAR_ON_SETID;
676dac4b 940
84088ba2
JS		 941 return 0;
942}
676dac4b 943
84088ba2
JS		 944/**
945 * smack_bprm_committing_creds - Prepare to install the new credentials
946 * from bprm.
947 *
948 * @bprm: binprm for exec
949 */
950static void smack_bprm_committing_creds(struct linux_binprm *bprm)
951{
952 struct task_smack *bsp = bprm->cred->security;
676dac4b 953
84088ba2
JS		 954 if (bsp->smk_task != bsp->smk_forked)
955 current->pdeath_signal = 0;
956}
957
958/**
959 * smack_bprm_secureexec - Return the decision to use secureexec.
960 * @bprm: binprm for exec
961 *
962 * Returns 0 on success.
963 */
964static int smack_bprm_secureexec(struct linux_binprm *bprm)
965{
966 struct task_smack *tsp = current_security();
84088ba2 967
b1d9e6b0
CS		 968 if (tsp->smk_task != tsp->smk_forked)
969 return 1;
84088ba2 970
b1d9e6b0 971 return 0;
676dac4b
CS		 972}
973
e114e473
CS		 974/*
975 * Inode hooks
976 */
977
978/**
979 * smack_inode_alloc_security - allocate an inode blob
251a2a95 980 * @inode: the inode in need of a blob
e114e473
CS		 981 *
982 * Returns 0 if it gets a blob, -ENOMEM otherwise
983 */
984static int smack_inode_alloc_security(struct inode *inode)
985{
2f823ff8
CS		 986 struct smack_known *skp = smk_of_current();
987
21c7eae2 988 inode->i_security = new_inode_smack(skp);
e114e473
CS		 989 if (inode->i_security == NULL)
990 return -ENOMEM;
991 return 0;
992}
993
994/**
995 * smack_inode_free_security - free an inode blob
251a2a95 996 * @inode: the inode with a blob
e114e473
CS		 997 *
998 * Clears the blob pointer in inode
999 */
1000static void smack_inode_free_security(struct inode *inode)
1001{
1a5b472b 1002 kmem_cache_free(smack_inode_cache, inode->i_security);
e114e473
CS		 1003 inode->i_security = NULL;
1004}
1005
1006/**
1007 * smack_inode_init_security - copy out the smack from an inode
e95ef49b
LP		 1008 * @inode: the newly created inode
1009 * @dir: containing directory object
2a7dba39 1010 * @qstr: unused
e114e473
CS		 1011 * @name: where to put the attribute name
1012 * @value: where to put the attribute value
1013 * @len: where to put the length of the attribute
1014 *
1015 * Returns 0 if it all works out, -ENOMEM if there's no memory
1016 */
1017static int smack_inode_init_security(struct inode *inode, struct inode *dir,
9548906b 1018 const struct qstr *qstr, const char **name,
2a7dba39 1019 void **value, size_t *len)
e114e473 1020{
2267b13a 1021 struct inode_smack *issp = inode->i_security;
2f823ff8 1022 struct smack_known *skp = smk_of_current();
21c7eae2
LP		 1023 struct smack_known *isp = smk_of_inode(inode);
1024 struct smack_known *dsp = smk_of_inode(dir);
7898e1f8 1025 int may;
e114e473 1026
9548906b
TH		 1027 if (name)
1028 *name = XATTR_SMACK_SUFFIX;
e114e473 1029
68390ccf 1030 if (value && len) {
7898e1f8 1031 rcu_read_lock();
21c7eae2
LP		 1032 may = smk_access_entry(skp->smk_known, dsp->smk_known,
1033 &skp->smk_rules);
7898e1f8 1034 rcu_read_unlock();
5c6d1125
JS		 1035
1036 /*
1037 * If the access rule allows transmutation and
1038 * the directory requests transmutation then
1039 * by all means transmute.
2267b13a 1040 * Mark the inode as changed.
5c6d1125 1041 */
7898e1f8 1042 if (may > 0 && ((may & MAY_TRANSMUTE) != 0) &&
2267b13a 1043 smk_inode_transmutable(dir)) {
5c6d1125 1044 isp = dsp;
2267b13a
CS		 1045 issp->smk_flags |= SMK_INODE_CHANGED;
1046 }
5c6d1125 1047
21c7eae2 1048 *value = kstrdup(isp->smk_known, GFP_NOFS);
e114e473
CS		 1049 if (*value == NULL)
1050 return -ENOMEM;
e114e473 1051
21c7eae2 1052 *len = strlen(isp->smk_known);
68390ccf 1053 }
e114e473
CS		 1054
1055 return 0;
1056}
1057
1058/**
1059 * smack_inode_link - Smack check on link
1060 * @old_dentry: the existing object
1061 * @dir: unused
1062 * @new_dentry: the new object
1063 *
1064 * Returns 0 if access is permitted, an error code otherwise
1065 */
1066static int smack_inode_link(struct dentry *old_dentry, struct inode *dir,
1067 struct dentry *new_dentry)
1068{
21c7eae2 1069 struct smack_known *isp;
ecfcc53f
EB		 1070 struct smk_audit_info ad;
1071 int rc;
1072
a269434d 1073 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
ecfcc53f 1074 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
e114e473 1075
c6f493d6 1076 isp = smk_of_inode(d_backing_inode(old_dentry));
ecfcc53f 1077 rc = smk_curacc(isp, MAY_WRITE, &ad);
c6f493d6 1078 rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_WRITE, rc);
e114e473 1079
8802565b 1080 if (rc == 0 && d_is_positive(new_dentry)) {
c6f493d6 1081 isp = smk_of_inode(d_backing_inode(new_dentry));
ecfcc53f
EB		 1082 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
1083 rc = smk_curacc(isp, MAY_WRITE, &ad);
c6f493d6 1084 rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_WRITE, rc);
e114e473
CS		 1085 }
1086
1087 return rc;
1088}
1089
1090/**
1091 * smack_inode_unlink - Smack check on inode deletion
1092 * @dir: containing directory object
1093 * @dentry: file to unlink
1094 *
1095 * Returns 0 if current can write the containing directory
1096 * and the object, error code otherwise
1097 */
1098static int smack_inode_unlink(struct inode *dir, struct dentry *dentry)
1099{
c6f493d6 1100 struct inode *ip = d_backing_inode(dentry);
ecfcc53f 1101 struct smk_audit_info ad;
e114e473
CS		 1102 int rc;
1103
a269434d 1104 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
ecfcc53f
EB		 1105 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1106
e114e473
CS		 1107 /*
1108 * You need write access to the thing you're unlinking
1109 */
ecfcc53f 1110 rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad);
d166c802 1111 rc = smk_bu_inode(ip, MAY_WRITE, rc);
ecfcc53f 1112 if (rc == 0) {
e114e473
CS		 1113 /*
1114 * You also need write access to the containing directory
1115 */
cdb56b60 1116 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
ecfcc53f
EB		 1117 smk_ad_setfield_u_fs_inode(&ad, dir);
1118 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
d166c802 1119 rc = smk_bu_inode(dir, MAY_WRITE, rc);
ecfcc53f 1120 }
e114e473
CS		 1121 return rc;
1122}
1123
1124/**
1125 * smack_inode_rmdir - Smack check on directory deletion
1126 * @dir: containing directory object
1127 * @dentry: directory to unlink
1128 *
1129 * Returns 0 if current can write the containing directory
1130 * and the directory, error code otherwise
1131 */
1132static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry)
1133{
ecfcc53f 1134 struct smk_audit_info ad;
e114e473
CS		 1135 int rc;
1136
a269434d 1137 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
ecfcc53f
EB		 1138 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1139
e114e473
CS		 1140 /*
1141 * You need write access to the thing you're removing
1142 */
c6f493d6
DH		 1143 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1144 rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
ecfcc53f 1145 if (rc == 0) {
e114e473
CS		 1146 /*
1147 * You also need write access to the containing directory
1148 */
cdb56b60 1149 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
ecfcc53f
EB		 1150 smk_ad_setfield_u_fs_inode(&ad, dir);
1151 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
d166c802 1152 rc = smk_bu_inode(dir, MAY_WRITE, rc);
ecfcc53f 1153 }
e114e473
CS		 1154
1155 return rc;
1156}
1157
1158/**
1159 * smack_inode_rename - Smack check on rename
e95ef49b
LP		 1160 * @old_inode: unused
1161 * @old_dentry: the old object
1162 * @new_inode: unused
1163 * @new_dentry: the new object
e114e473
CS		 1164 *
1165 * Read and write access is required on both the old and
1166 * new directories.
1167 *
1168 * Returns 0 if access is permitted, an error code otherwise
1169 */
1170static int smack_inode_rename(struct inode *old_inode,
1171 struct dentry *old_dentry,
1172 struct inode *new_inode,
1173 struct dentry *new_dentry)
1174{
1175 int rc;
21c7eae2 1176 struct smack_known *isp;
ecfcc53f
EB		 1177 struct smk_audit_info ad;
1178
a269434d 1179 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
ecfcc53f 1180 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
e114e473 1181
c6f493d6 1182 isp = smk_of_inode(d_backing_inode(old_dentry));
ecfcc53f 1183 rc = smk_curacc(isp, MAY_READWRITE, &ad);
c6f493d6 1184 rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_READWRITE, rc);
e114e473 1185
8802565b 1186 if (rc == 0 && d_is_positive(new_dentry)) {
c6f493d6 1187 isp = smk_of_inode(d_backing_inode(new_dentry));
ecfcc53f
EB		 1188 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
1189 rc = smk_curacc(isp, MAY_READWRITE, &ad);
c6f493d6 1190 rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_READWRITE, rc);
e114e473 1191 }
e114e473
CS		 1192 return rc;
1193}
1194
1195/**
1196 * smack_inode_permission - Smack version of permission()
1197 * @inode: the inode in question
1198 * @mask: the access requested
e114e473
CS		 1199 *
1200 * This is the important Smack hook.
1201 *
1202 * Returns 0 if access is permitted, -EACCES otherwise
1203 */
e74f71eb 1204static int smack_inode_permission(struct inode *inode, int mask)
e114e473 1205{
ecfcc53f 1206 struct smk_audit_info ad;
e74f71eb 1207 int no_block = mask & MAY_NOT_BLOCK;
d166c802 1208 int rc;
d09ca739
EP		 1209
1210 mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND);
e114e473
CS		 1211 /*
1212 * No permission to check. Existence test. Yup, it's there.
1213 */
1214 if (mask == 0)
1215 return 0;
8c9e80ed
AK		 1216
1217 /* May be droppable after audit */
e74f71eb 1218 if (no_block)
8c9e80ed 1219 return -ECHILD;
f48b7399 1220 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
ecfcc53f 1221 smk_ad_setfield_u_fs_inode(&ad, inode);
d166c802
CS		 1222 rc = smk_curacc(smk_of_inode(inode), mask, &ad);
1223 rc = smk_bu_inode(inode, mask, rc);
1224 return rc;
e114e473
CS		 1225}
1226
1227/**
1228 * smack_inode_setattr - Smack check for setting attributes
1229 * @dentry: the object
1230 * @iattr: for the force flag
1231 *
1232 * Returns 0 if access is permitted, an error code otherwise
1233 */
1234static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr)
1235{
ecfcc53f 1236 struct smk_audit_info ad;
d166c802
CS		 1237 int rc;
1238
e114e473
CS		 1239 /*
1240 * Need to allow for clearing the setuid bit.
1241 */
1242 if (iattr->ia_valid & ATTR_FORCE)
1243 return 0;
a269434d 1244 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
ecfcc53f 1245 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
e114e473 1246
c6f493d6
DH		 1247 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1248 rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
d166c802 1249 return rc;
e114e473
CS		 1250}
1251
1252/**
1253 * smack_inode_getattr - Smack check for getting attributes
e95ef49b 1254 * @mnt: vfsmount of the object
e114e473
CS		 1255 * @dentry: the object
1256 *
1257 * Returns 0 if access is permitted, an error code otherwise
1258 */
3f7036a0 1259static int smack_inode_getattr(const struct path *path)
e114e473 1260{
ecfcc53f 1261 struct smk_audit_info ad;
c6f493d6 1262 struct inode *inode = d_backing_inode(path->dentry);
d166c802 1263 int rc;
ecfcc53f 1264
f48b7399 1265 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
3f7036a0
AV		 1266 smk_ad_setfield_u_fs_path(&ad, *path);
1267 rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad);
1268 rc = smk_bu_inode(inode, MAY_READ, rc);
d166c802 1269 return rc;
e114e473
CS		 1270}
1271
1272/**
1273 * smack_inode_setxattr - Smack check for setting xattrs
1274 * @dentry: the object
1275 * @name: name of the attribute
e95ef49b
LP		 1276 * @value: value of the attribute
1277 * @size: size of the value
e114e473
CS		 1278 * @flags: unused
1279 *
1280 * This protects the Smack attribute explicitly.
1281 *
1282 * Returns 0 if access is permitted, an error code otherwise
1283 */
8f0cfa52
DH		 1284static int smack_inode_setxattr(struct dentry *dentry, const char *name,
1285 const void *value, size_t size, int flags)
e114e473 1286{
ecfcc53f 1287 struct smk_audit_info ad;
19760ad0
CS		 1288 struct smack_known *skp;
1289 int check_priv = 0;
1290 int check_import = 0;
1291 int check_star = 0;
bcdca225 1292 int rc = 0;
e114e473 1293
19760ad0
CS		 1294 /*
1295 * Check label validity here so import won't fail in post_setxattr
1296 */
bcdca225
CS		 1297 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
1298 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
19760ad0
CS		 1299 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) {
1300 check_priv = 1;
1301 check_import = 1;
1302 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
1303 strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
1304 check_priv = 1;
1305 check_import = 1;
1306 check_star = 1;
5c6d1125 1307 } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
19760ad0 1308 check_priv = 1;
5c6d1125
JS		 1309 if (size != TRANS_TRUE_SIZE ||
1310 strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0)
1311 rc = -EINVAL;
bcdca225
CS		 1312 } else
1313 rc = cap_inode_setxattr(dentry, name, value, size, flags);
1314
19760ad0
CS		 1315 if (check_priv && !smack_privileged(CAP_MAC_ADMIN))
1316 rc = -EPERM;
1317
1318 if (rc == 0 && check_import) {
b862e561 1319 skp = size ? smk_import_entry(value, size) : NULL;
e774ad68
LP		 1320 if (IS_ERR(skp))
1321 rc = PTR_ERR(skp);
1322 else if (skp == NULL || (check_star &&
19760ad0
CS		 1323 (skp == &smack_known_star || skp == &smack_known_web)))
1324 rc = -EINVAL;
1325 }
1326
a269434d 1327 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
ecfcc53f
EB		 1328 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1329
d166c802 1330 if (rc == 0) {
c6f493d6
DH		 1331 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1332 rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
d166c802 1333 }
bcdca225
CS		 1334
1335 return rc;
e114e473
CS		 1336}
1337
1338/**
1339 * smack_inode_post_setxattr - Apply the Smack update approved above
1340 * @dentry: object
1341 * @name: attribute name
1342 * @value: attribute value
1343 * @size: attribute size
1344 * @flags: unused
1345 *
1346 * Set the pointer in the inode blob to the entry found
1347 * in the master label list.
1348 */
8f0cfa52
DH		 1349static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
1350 const void *value, size_t size, int flags)
e114e473 1351{
2f823ff8 1352 struct smack_known *skp;
c6f493d6 1353 struct inode_smack *isp = d_backing_inode(dentry)->i_security;
676dac4b 1354
2f823ff8
CS		 1355 if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
1356 isp->smk_flags |= SMK_INODE_TRANSMUTE;
1357 return;
1358 }
1359
676dac4b 1360 if (strcmp(name, XATTR_NAME_SMACK) == 0) {
9598f4c9 1361 skp = smk_import_entry(value, size);
e774ad68 1362 if (!IS_ERR(skp))
21c7eae2 1363 isp->smk_inode = skp;
676dac4b 1364 else
21c7eae2 1365 isp->smk_inode = &smack_known_invalid;
5c6d1125 1366 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) {
9598f4c9 1367 skp = smk_import_entry(value, size);
e774ad68 1368 if (!IS_ERR(skp))
2f823ff8 1369 isp->smk_task = skp;
676dac4b 1370 else
2f823ff8 1371 isp->smk_task = &smack_known_invalid;
7898e1f8 1372 } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
9598f4c9 1373 skp = smk_import_entry(value, size);
e774ad68 1374 if (!IS_ERR(skp))
2f823ff8 1375 isp->smk_mmap = skp;
7898e1f8 1376 else
2f823ff8
CS		 1377 isp->smk_mmap = &smack_known_invalid;
1378 }
e114e473
CS		 1379
1380 return;
1381}
1382
ce8a4321 1383/**
e114e473
CS		 1384 * smack_inode_getxattr - Smack check on getxattr
1385 * @dentry: the object
1386 * @name: unused
1387 *
1388 * Returns 0 if access is permitted, an error code otherwise
1389 */
8f0cfa52 1390static int smack_inode_getxattr(struct dentry *dentry, const char *name)
e114e473 1391{
ecfcc53f 1392 struct smk_audit_info ad;
d166c802 1393 int rc;
ecfcc53f 1394
a269434d 1395 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
ecfcc53f
EB		 1396 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1397
c6f493d6
DH		 1398 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_READ, &ad);
1399 rc = smk_bu_inode(d_backing_inode(dentry), MAY_READ, rc);
d166c802 1400 return rc;
e114e473
CS		 1401}
1402
ce8a4321 1403/**
e114e473
CS		 1404 * smack_inode_removexattr - Smack check on removexattr
1405 * @dentry: the object
1406 * @name: name of the attribute
1407 *
1408 * Removing the Smack attribute requires CAP_MAC_ADMIN
1409 *
1410 * Returns 0 if access is permitted, an error code otherwise
1411 */
8f0cfa52 1412static int smack_inode_removexattr(struct dentry *dentry, const char *name)
e114e473 1413{
676dac4b 1414 struct inode_smack *isp;
ecfcc53f 1415 struct smk_audit_info ad;
bcdca225 1416 int rc = 0;
e114e473 1417
bcdca225
CS		 1418 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
1419 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
676dac4b 1420 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
5c6d1125 1421 strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
7898e1f8 1422 strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 ||
5e9ab593 1423 strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
1880eff7 1424 if (!smack_privileged(CAP_MAC_ADMIN))
bcdca225
CS		 1425 rc = -EPERM;
1426 } else
1427 rc = cap_inode_removexattr(dentry, name);
1428
f59bdfba
CS		 1429 if (rc != 0)
1430 return rc;
1431
a269434d 1432 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
ecfcc53f 1433 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
bcdca225 1434
c6f493d6
DH		 1435 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1436 rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
f59bdfba
CS		 1437 if (rc != 0)
1438 return rc;
1439
c6f493d6 1440 isp = d_backing_inode(dentry)->i_security;
f59bdfba
CS		 1441 /*
1442 * Don't do anything special for these.
1443 * XATTR_NAME_SMACKIPIN
1444 * XATTR_NAME_SMACKIPOUT
1445 * XATTR_NAME_SMACKEXEC
1446 */
1447 if (strcmp(name, XATTR_NAME_SMACK) == 0)
676dac4b 1448 isp->smk_task = NULL;
f59bdfba 1449 else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0)
7898e1f8 1450 isp->smk_mmap = NULL;
f59bdfba
CS		 1451 else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0)
1452 isp->smk_flags &= ~SMK_INODE_TRANSMUTE;
676dac4b 1453
f59bdfba 1454 return 0;
e114e473
CS		 1455}
1456
1457/**
1458 * smack_inode_getsecurity - get smack xattrs
1459 * @inode: the object
1460 * @name: attribute name
1461 * @buffer: where to put the result
251a2a95 1462 * @alloc: unused
e114e473
CS		 1463 *
1464 * Returns the size of the attribute or an error code
1465 */
ea861dfd 1466static int smack_inode_getsecurity(struct inode *inode,
e114e473
CS		 1467 const char *name, void **buffer,
1468 bool alloc)
1469{
1470 struct socket_smack *ssp;
1471 struct socket *sock;
1472 struct super_block *sbp;
1473 struct inode *ip = (struct inode *)inode;
21c7eae2 1474 struct smack_known *isp;
e114e473
CS		 1475 int ilen;
1476 int rc = 0;
1477
1478 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
1479 isp = smk_of_inode(inode);
21c7eae2
LP		 1480 ilen = strlen(isp->smk_known);
1481 *buffer = isp->smk_known;
e114e473
CS		 1482 return ilen;
1483 }
1484
1485 /*
1486 * The rest of the Smack xattrs are only on sockets.
1487 */
1488 sbp = ip->i_sb;
1489 if (sbp->s_magic != SOCKFS_MAGIC)
1490 return -EOPNOTSUPP;
1491
1492 sock = SOCKET_I(ip);
2e1d146a 1493 if (sock == NULL || sock->sk == NULL)
e114e473
CS		 1494 return -EOPNOTSUPP;
1495
1496 ssp = sock->sk->sk_security;
1497
1498 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
21c7eae2 1499 isp = ssp->smk_in;
e114e473 1500 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0)
21c7eae2 1501 isp = ssp->smk_out;
e114e473
CS		 1502 else
1503 return -EOPNOTSUPP;
1504
21c7eae2 1505 ilen = strlen(isp->smk_known);
e114e473 1506 if (rc == 0) {
21c7eae2 1507 *buffer = isp->smk_known;
e114e473
CS		 1508 rc = ilen;
1509 }
1510
1511 return rc;
1512}
1513
1514
1515/**
1516 * smack_inode_listsecurity - list the Smack attributes
1517 * @inode: the object
1518 * @buffer: where they go
1519 * @buffer_size: size of buffer
e114e473
CS		 1520 */
1521static int smack_inode_listsecurity(struct inode *inode, char *buffer,
1522 size_t buffer_size)
1523{
fd5c9d23 1524 int len = sizeof(XATTR_NAME_SMACK);
e114e473 1525
fd5c9d23 1526 if (buffer != NULL && len <= buffer_size)
e114e473 1527 memcpy(buffer, XATTR_NAME_SMACK, len);
fd5c9d23
KK		 1528
1529 return len;
e114e473
CS		 1530}
1531
d20bdda6
AD		 1532/**
1533 * smack_inode_getsecid - Extract inode's security id
1534 * @inode: inode to extract the info from
1535 * @secid: where result will be saved
1536 */
d6335d77 1537static void smack_inode_getsecid(struct inode *inode, u32 *secid)
d20bdda6
AD		 1538{
1539 struct inode_smack *isp = inode->i_security;
1540
21c7eae2 1541 *secid = isp->smk_inode->smk_secid;
d20bdda6
AD		 1542}
1543
e114e473
CS		 1544/*
1545 * File Hooks
1546 */
1547
1548/**
1549 * smack_file_permission - Smack check on file operations
1550 * @file: unused
1551 * @mask: unused
1552 *
1553 * Returns 0
1554 *
1555 * Should access checks be done on each read or write?
1556 * UNICOS and SELinux say yes.
1557 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
1558 *
1559 * I'll say no for now. Smack does not do the frequent
1560 * label changing that SELinux does.
1561 */
1562static int smack_file_permission(struct file *file, int mask)
1563{
1564 return 0;
1565}
1566
1567/**
1568 * smack_file_alloc_security - assign a file security blob
1569 * @file: the object
1570 *
1571 * The security blob for a file is a pointer to the master
1572 * label list, so no allocation is done.
1573 *
5e7270a6
CS		 1574 * f_security is the owner security information. It
1575 * isn't used on file access checks, it's for send_sigio.
1576 *
e114e473
CS		 1577 * Returns 0
1578 */
1579static int smack_file_alloc_security(struct file *file)
1580{
2f823ff8
CS		 1581 struct smack_known *skp = smk_of_current();
1582
21c7eae2 1583 file->f_security = skp;
e114e473
CS		 1584 return 0;
1585}
1586
1587/**
1588 * smack_file_free_security - clear a file security blob
1589 * @file: the object
1590 *
1591 * The security blob for a file is a pointer to the master
1592 * label list, so no memory is freed.
1593 */
1594static void smack_file_free_security(struct file *file)
1595{
1596 file->f_security = NULL;
1597}
1598
1599/**
1600 * smack_file_ioctl - Smack check on ioctls
1601 * @file: the object
1602 * @cmd: what to do
1603 * @arg: unused
1604 *
1605 * Relies heavily on the correct use of the ioctl command conventions.
1606 *
1607 * Returns 0 if allowed, error code otherwise
1608 */
1609static int smack_file_ioctl(struct file *file, unsigned int cmd,
1610 unsigned long arg)
1611{
1612 int rc = 0;
ecfcc53f 1613 struct smk_audit_info ad;
5e7270a6 1614 struct inode *inode = file_inode(file);
ecfcc53f 1615
f48b7399 1616 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
ecfcc53f 1617 smk_ad_setfield_u_fs_path(&ad, file->f_path);
e114e473 1618
d166c802 1619 if (_IOC_DIR(cmd) & _IOC_WRITE) {
5e7270a6 1620 rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad);
d166c802
CS		 1621 rc = smk_bu_file(file, MAY_WRITE, rc);
1622 }
e114e473 1623
d166c802 1624 if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) {
5e7270a6 1625 rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad);
d166c802
CS		 1626 rc = smk_bu_file(file, MAY_READ, rc);
1627 }
e114e473
CS		 1628
1629 return rc;
1630}
1631
1632/**
1633 * smack_file_lock - Smack check on file locking
1634 * @file: the object
251a2a95 1635 * @cmd: unused
e114e473 1636 *
c0ab6e56 1637 * Returns 0 if current has lock access, error code otherwise
e114e473
CS		 1638 */
1639static int smack_file_lock(struct file *file, unsigned int cmd)
1640{
ecfcc53f 1641 struct smk_audit_info ad;
d166c802 1642 int rc;
5e7270a6 1643 struct inode *inode = file_inode(file);
ecfcc53f 1644
92f42509
EP		 1645 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1646 smk_ad_setfield_u_fs_path(&ad, file->f_path);
5e7270a6 1647 rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad);
d166c802
CS		 1648 rc = smk_bu_file(file, MAY_LOCK, rc);
1649 return rc;
e114e473
CS		 1650}
1651
1652/**
1653 * smack_file_fcntl - Smack check on fcntl
1654 * @file: the object
1655 * @cmd: what action to check
1656 * @arg: unused
1657 *
531f1d45
CS		 1658 * Generally these operations are harmless.
1659 * File locking operations present an obvious mechanism
1660 * for passing information, so they require write access.
1661 *
e114e473
CS		 1662 * Returns 0 if current has access, error code otherwise
1663 */
1664static int smack_file_fcntl(struct file *file, unsigned int cmd,
1665 unsigned long arg)
1666{
ecfcc53f 1667 struct smk_audit_info ad;
531f1d45 1668 int rc = 0;
5e7270a6 1669 struct inode *inode = file_inode(file);
ecfcc53f 1670
e114e473 1671 switch (cmd) {
e114e473 1672 case F_GETLK:
c0ab6e56 1673 break;
e114e473
CS		 1674 case F_SETLK:
1675 case F_SETLKW:
c0ab6e56
CS		 1676 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1677 smk_ad_setfield_u_fs_path(&ad, file->f_path);
5e7270a6 1678 rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad);
d166c802 1679 rc = smk_bu_file(file, MAY_LOCK, rc);
c0ab6e56 1680 break;
e114e473
CS		 1681 case F_SETOWN:
1682 case F_SETSIG:
531f1d45
CS		 1683 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1684 smk_ad_setfield_u_fs_path(&ad, file->f_path);
5e7270a6 1685 rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad);
d166c802 1686 rc = smk_bu_file(file, MAY_WRITE, rc);
e114e473
CS		 1687 break;
1688 default:
531f1d45 1689 break;
e114e473
CS		 1690 }
1691
1692 return rc;
1693}
1694
7898e1f8 1695/**
e5467859 1696 * smack_mmap_file :
7898e1f8
CS		 1697 * Check permissions for a mmap operation. The @file may be NULL, e.g.
1698 * if mapping anonymous memory.
1699 * @file contains the file structure for file to map (may be NULL).
1700 * @reqprot contains the protection requested by the application.
1701 * @prot contains the protection that will be applied by the kernel.
1702 * @flags contains the operational flags.
1703 * Return 0 if permission is granted.
1704 */
e5467859 1705static int smack_mmap_file(struct file *file,
7898e1f8 1706 unsigned long reqprot, unsigned long prot,
e5467859 1707 unsigned long flags)
7898e1f8 1708{
272cd7a8 1709 struct smack_known *skp;
2f823ff8 1710 struct smack_known *mkp;
7898e1f8
CS		 1711 struct smack_rule *srp;
1712 struct task_smack *tsp;
21c7eae2 1713 struct smack_known *okp;
7898e1f8 1714 struct inode_smack *isp;
0e0a070d
CS		 1715 int may;
1716 int mmay;
1717 int tmay;
7898e1f8
CS		 1718 int rc;
1719
496ad9aa 1720 if (file == NULL)
7898e1f8
CS		 1721 return 0;
1722
496ad9aa 1723 isp = file_inode(file)->i_security;
7898e1f8
CS		 1724 if (isp->smk_mmap == NULL)
1725 return 0;
2f823ff8 1726 mkp = isp->smk_mmap;
7898e1f8
CS		 1727
1728 tsp = current_security();
2f823ff8 1729 skp = smk_of_current();
7898e1f8
CS		 1730 rc = 0;
1731
1732 rcu_read_lock();
1733 /*
1734 * For each Smack rule associated with the subject
1735 * label verify that the SMACK64MMAP also has access
1736 * to that rule's object label.
7898e1f8 1737 */
272cd7a8 1738 list_for_each_entry_rcu(srp, &skp->smk_rules, list) {
21c7eae2 1739 okp = srp->smk_object;
7898e1f8
CS		 1740 /*
1741 * Matching labels always allows access.
1742 */
21c7eae2 1743 if (mkp->smk_known == okp->smk_known)
7898e1f8 1744 continue;
0e0a070d
CS		 1745 /*
1746 * If there is a matching local rule take
1747 * that into account as well.
1748 */
21c7eae2
LP		 1749 may = smk_access_entry(srp->smk_subject->smk_known,
1750 okp->smk_known,
1751 &tsp->smk_rules);
0e0a070d
CS		 1752 if (may == -ENOENT)
1753 may = srp->smk_access;
1754 else
1755 may &= srp->smk_access;
1756 /*
1757 * If may is zero the SMACK64MMAP subject can't
1758 * possibly have less access.
1759 */
1760 if (may == 0)
1761 continue;
1762
1763 /*
1764 * Fetch the global list entry.
1765 * If there isn't one a SMACK64MMAP subject
1766 * can't have as much access as current.
1767 */
21c7eae2
LP		 1768 mmay = smk_access_entry(mkp->smk_known, okp->smk_known,
1769 &mkp->smk_rules);
0e0a070d
CS		 1770 if (mmay == -ENOENT) {
1771 rc = -EACCES;
1772 break;
1773 }
1774 /*
1775 * If there is a local entry it modifies the
1776 * potential access, too.
1777 */
21c7eae2
LP		 1778 tmay = smk_access_entry(mkp->smk_known, okp->smk_known,
1779 &tsp->smk_rules);
0e0a070d
CS		 1780 if (tmay != -ENOENT)
1781 mmay &= tmay;
7898e1f8 1782
0e0a070d
CS		 1783 /*
1784 * If there is any access available to current that is
1785 * not available to a SMACK64MMAP subject
1786 * deny access.
1787 */
75a25637 1788 if ((may | mmay) != mmay) {
0e0a070d 1789 rc = -EACCES;
7898e1f8 1790 break;
0e0a070d 1791 }
7898e1f8
CS		 1792 }
1793
1794 rcu_read_unlock();
1795
1796 return rc;
1797}
1798
e114e473
CS		 1799/**
1800 * smack_file_set_fowner - set the file security blob value
1801 * @file: object in question
1802 *
e114e473 1803 */
e0b93edd 1804static void smack_file_set_fowner(struct file *file)
e114e473 1805{
5e7270a6 1806 file->f_security = smk_of_current();
e114e473
CS		 1807}
1808
1809/**
1810 * smack_file_send_sigiotask - Smack on sigio
1811 * @tsk: The target task
1812 * @fown: the object the signal come from
1813 * @signum: unused
1814 *
1815 * Allow a privileged task to get signals even if it shouldn't
1816 *
1817 * Returns 0 if a subject with the object's smack could
1818 * write to the task, an error code otherwise.
1819 */
1820static int smack_file_send_sigiotask(struct task_struct *tsk,
1821 struct fown_struct *fown, int signum)
1822{
2f823ff8
CS		 1823 struct smack_known *skp;
1824 struct smack_known *tkp = smk_of_task(tsk->cred->security);
e114e473
CS		 1825 struct file *file;
1826 int rc;
ecfcc53f 1827 struct smk_audit_info ad;
e114e473
CS		 1828
1829 /*
1830 * struct fown_struct is never outside the context of a struct file
1831 */
1832 file = container_of(fown, struct file, f_owner);
7898e1f8 1833
ecfcc53f 1834 /* we don't log here as rc can be overriden */
21c7eae2
LP		 1835 skp = file->f_security;
1836 rc = smk_access(skp, tkp, MAY_WRITE, NULL);
1837 rc = smk_bu_note("sigiotask", skp, tkp, MAY_WRITE, rc);
5cd9c58f 1838 if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE))
ecfcc53f
EB		 1839 rc = 0;
1840
1841 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1842 smk_ad_setfield_u_tsk(&ad, tsk);
21c7eae2 1843 smack_log(skp->smk_known, tkp->smk_known, MAY_WRITE, rc, &ad);
e114e473
CS		 1844 return rc;
1845}
1846
1847/**
1848 * smack_file_receive - Smack file receive check
1849 * @file: the object
1850 *
1851 * Returns 0 if current has access, error code otherwise
1852 */
1853static int smack_file_receive(struct file *file)
1854{
d166c802 1855 int rc;
e114e473 1856 int may = 0;
ecfcc53f 1857 struct smk_audit_info ad;
5e7270a6 1858 struct inode *inode = file_inode(file);
79be0935
CS		 1859 struct socket *sock;
1860 struct task_smack *tsp;
1861 struct socket_smack *ssp;
e114e473 1862
9777582e
SWK		 1863 if (unlikely(IS_PRIVATE(inode)))
1864 return 0;
1865
4482a44f 1866 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
ecfcc53f 1867 smk_ad_setfield_u_fs_path(&ad, file->f_path);
79be0935
CS		 1868
1869 if (S_ISSOCK(inode->i_mode)) {
1870 sock = SOCKET_I(inode);
1871 ssp = sock->sk->sk_security;
1872 tsp = current_security();
1873 /*
1874 * If the receiving process can't write to the
1875 * passed socket or if the passed socket can't
1876 * write to the receiving process don't accept
1877 * the passed socket.
1878 */
1879 rc = smk_access(tsp->smk_task, ssp->smk_out, MAY_WRITE, &ad);
1880 rc = smk_bu_file(file, may, rc);
1881 if (rc < 0)
1882 return rc;
1883 rc = smk_access(ssp->smk_in, tsp->smk_task, MAY_WRITE, &ad);
1884 rc = smk_bu_file(file, may, rc);
1885 return rc;
1886 }
e114e473
CS		 1887 /*
1888 * This code relies on bitmasks.
1889 */
1890 if (file->f_mode & FMODE_READ)
1891 may = MAY_READ;
1892 if (file->f_mode & FMODE_WRITE)
1893 may |= MAY_WRITE;
1894
5e7270a6 1895 rc = smk_curacc(smk_of_inode(inode), may, &ad);
d166c802
CS		 1896 rc = smk_bu_file(file, may, rc);
1897 return rc;
e114e473
CS		 1898}
1899
531f1d45 1900/**
83d49856 1901 * smack_file_open - Smack dentry open processing
531f1d45 1902 * @file: the object
a6834c0b 1903 * @cred: task credential
531f1d45
CS		 1904 *
1905 * Set the security blob in the file structure.
a6834c0b
CS		 1906 * Allow the open only if the task has read access. There are
1907 * many read operations (e.g. fstat) that you can do with an
1908 * fd even if you have the file open write-only.
531f1d45
CS		 1909 *
1910 * Returns 0
1911 */
83d49856 1912static int smack_file_open(struct file *file, const struct cred *cred)
531f1d45 1913{
a6834c0b 1914 struct task_smack *tsp = cred->security;
5e7270a6 1915 struct inode *inode = file_inode(file);
a6834c0b
CS		 1916 struct smk_audit_info ad;
1917 int rc;
531f1d45 1918
5e7270a6 1919 if (smack_privileged(CAP_MAC_OVERRIDE))
a6834c0b 1920 return 0;
531f1d45 1921
a6834c0b
CS		 1922 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1923 smk_ad_setfield_u_fs_path(&ad, file->f_path);
5e7270a6 1924 rc = smk_access(tsp->smk_task, smk_of_inode(inode), MAY_READ, &ad);
d166c802 1925 rc = smk_bu_credfile(cred, file, MAY_READ, rc);
a6834c0b
CS		 1926
1927 return rc;
531f1d45
CS		 1928}
1929
e114e473
CS		 1930/*
1931 * Task hooks
1932 */
1933
ee18d64c
DH		 1934/**
1935 * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1936 * @new: the new credentials
1937 * @gfp: the atomicity of any memory allocations
1938 *
1939 * Prepare a blank set of credentials for modification. This must allocate all
1940 * the memory the LSM module might require such that cred_transfer() can
1941 * complete without error.
1942 */
1943static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp)
1944{
7898e1f8
CS		 1945 struct task_smack *tsp;
1946
1947 tsp = new_task_smack(NULL, NULL, gfp);
1948 if (tsp == NULL)
676dac4b 1949 return -ENOMEM;
7898e1f8
CS		 1950
1951 cred->security = tsp;
1952
ee18d64c
DH		 1953 return 0;
1954}
1955
1956
e114e473 1957/**
f1752eec
DH		 1958 * smack_cred_free - "free" task-level security credentials
1959 * @cred: the credentials in question
e114e473 1960 *
e114e473 1961 */
f1752eec 1962static void smack_cred_free(struct cred *cred)
e114e473 1963{
7898e1f8
CS		 1964 struct task_smack *tsp = cred->security;
1965 struct smack_rule *rp;
1966 struct list_head *l;
1967 struct list_head *n;
1968
1969 if (tsp == NULL)
1970 return;
1971 cred->security = NULL;
1972
38416e53
ZJ		 1973 smk_destroy_label_list(&tsp->smk_relabel);
1974
7898e1f8
CS		 1975 list_for_each_safe(l, n, &tsp->smk_rules) {
1976 rp = list_entry(l, struct smack_rule, list);
1977 list_del(&rp->list);
1978 kfree(rp);
1979 }
1980 kfree(tsp);
e114e473
CS		 1981}
1982
d84f4f99
DH		 1983/**
1984 * smack_cred_prepare - prepare new set of credentials for modification
1985 * @new: the new credentials
1986 * @old: the original credentials
1987 * @gfp: the atomicity of any memory allocations
1988 *
1989 * Prepare a new set of credentials for modification.
1990 */
1991static int smack_cred_prepare(struct cred *new, const struct cred *old,
1992 gfp_t gfp)
1993{
676dac4b
CS		 1994 struct task_smack *old_tsp = old->security;
1995 struct task_smack *new_tsp;
7898e1f8 1996 int rc;
676dac4b 1997
7898e1f8 1998 new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp);
676dac4b
CS		 1999 if (new_tsp == NULL)
2000 return -ENOMEM;
2001
7898e1f8
CS		 2002 rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp);
2003 if (rc != 0)
2004 return rc;
2005
38416e53
ZJ		 2006 rc = smk_copy_relabel(&new_tsp->smk_relabel, &old_tsp->smk_relabel,
2007 gfp);
2008 if (rc != 0)
2009 return rc;
2010
676dac4b 2011 new->security = new_tsp;
d84f4f99
DH		 2012 return 0;
2013}
2014
ee18d64c
DH		 2015/**
2016 * smack_cred_transfer - Transfer the old credentials to the new credentials
2017 * @new: the new credentials
2018 * @old: the original credentials
2019 *
2020 * Fill in a set of blank credentials from another set of credentials.
2021 */
2022static void smack_cred_transfer(struct cred *new, const struct cred *old)
2023{
676dac4b
CS		 2024 struct task_smack *old_tsp = old->security;
2025 struct task_smack *new_tsp = new->security;
2026
2027 new_tsp->smk_task = old_tsp->smk_task;
2028 new_tsp->smk_forked = old_tsp->smk_task;
7898e1f8
CS		 2029 mutex_init(&new_tsp->smk_rules_lock);
2030 INIT_LIST_HEAD(&new_tsp->smk_rules);
2031
2032
2033 /* cbs copy rule list */
ee18d64c
DH		 2034}
2035
3a3b7ce9
DH		 2036/**
2037 * smack_kernel_act_as - Set the subjective context in a set of credentials
251a2a95
RD		 2038 * @new: points to the set of credentials to be modified.
2039 * @secid: specifies the security ID to be set
3a3b7ce9
DH		 2040 *
2041 * Set the security data for a kernel service.
2042 */
2043static int smack_kernel_act_as(struct cred *new, u32 secid)
2044{
676dac4b 2045 struct task_smack *new_tsp = new->security;
2f823ff8 2046 struct smack_known *skp = smack_from_secid(secid);
3a3b7ce9 2047
2f823ff8 2048 if (skp == NULL)
3a3b7ce9
DH		 2049 return -EINVAL;
2050
2f823ff8 2051 new_tsp->smk_task = skp;
3a3b7ce9
DH		 2052 return 0;
2053}
2054
2055/**
2056 * smack_kernel_create_files_as - Set the file creation label in a set of creds
251a2a95
RD		 2057 * @new: points to the set of credentials to be modified
2058 * @inode: points to the inode to use as a reference
3a3b7ce9
DH		 2059 *
2060 * Set the file creation context in a set of credentials to the same
2061 * as the objective context of the specified inode
2062 */
2063static int smack_kernel_create_files_as(struct cred *new,
2064 struct inode *inode)
2065{
2066 struct inode_smack *isp = inode->i_security;
676dac4b 2067 struct task_smack *tsp = new->security;
3a3b7ce9 2068
21c7eae2 2069 tsp->smk_forked = isp->smk_inode;
2f823ff8 2070 tsp->smk_task = tsp->smk_forked;
3a3b7ce9
DH		 2071 return 0;
2072}
2073
ecfcc53f
EB		 2074/**
2075 * smk_curacc_on_task - helper to log task related access
2076 * @p: the task object
531f1d45
CS		 2077 * @access: the access requested
2078 * @caller: name of the calling function for audit
ecfcc53f
EB		 2079 *
2080 * Return 0 if access is permitted
2081 */
531f1d45
CS		 2082static int smk_curacc_on_task(struct task_struct *p, int access,
2083 const char *caller)
ecfcc53f
EB		 2084{
2085 struct smk_audit_info ad;
6d1cff2a 2086 struct smack_known *skp = smk_of_task_struct(p);
d166c802 2087 int rc;
ecfcc53f 2088
531f1d45 2089 smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK);
ecfcc53f 2090 smk_ad_setfield_u_tsk(&ad, p);
21c7eae2 2091 rc = smk_curacc(skp, access, &ad);
d166c802
CS		 2092 rc = smk_bu_task(p, access, rc);
2093 return rc;
ecfcc53f
EB		 2094}
2095
e114e473
CS		 2096/**
2097 * smack_task_setpgid - Smack check on setting pgid
2098 * @p: the task object
2099 * @pgid: unused
2100 *
2101 * Return 0 if write access is permitted
2102 */
2103static int smack_task_setpgid(struct task_struct *p, pid_t pgid)
2104{
531f1d45 2105 return smk_curacc_on_task(p, MAY_WRITE, __func__);
e114e473
CS		 2106}
2107
2108/**
2109 * smack_task_getpgid - Smack access check for getpgid
2110 * @p: the object task
2111 *
2112 * Returns 0 if current can read the object task, error code otherwise
2113 */
2114static int smack_task_getpgid(struct task_struct *p)
2115{
531f1d45 2116 return smk_curacc_on_task(p, MAY_READ, __func__);
e114e473
CS		 2117}
2118
2119/**
2120 * smack_task_getsid - Smack access check for getsid
2121 * @p: the object task
2122 *
2123 * Returns 0 if current can read the object task, error code otherwise
2124 */
2125static int smack_task_getsid(struct task_struct *p)
2126{
531f1d45 2127 return smk_curacc_on_task(p, MAY_READ, __func__);
e114e473
CS		 2128}
2129
2130/**
2131 * smack_task_getsecid - get the secid of the task
2132 * @p: the object task
2133 * @secid: where to put the result
2134 *
2135 * Sets the secid to contain a u32 version of the smack label.
2136 */
2137static void smack_task_getsecid(struct task_struct *p, u32 *secid)
2138{
6d1cff2a 2139 struct smack_known *skp = smk_of_task_struct(p);
2f823ff8
CS		 2140
2141 *secid = skp->smk_secid;
e114e473
CS		 2142}
2143
2144/**
2145 * smack_task_setnice - Smack check on setting nice
2146 * @p: the task object
2147 * @nice: unused
2148 *
2149 * Return 0 if write access is permitted
2150 */
2151static int smack_task_setnice(struct task_struct *p, int nice)
2152{
b1d9e6b0 2153 return smk_curacc_on_task(p, MAY_WRITE, __func__);
e114e473
CS		 2154}
2155
2156/**
2157 * smack_task_setioprio - Smack check on setting ioprio
2158 * @p: the task object
2159 * @ioprio: unused
2160 *
2161 * Return 0 if write access is permitted
2162 */
2163static int smack_task_setioprio(struct task_struct *p, int ioprio)
2164{
b1d9e6b0 2165 return smk_curacc_on_task(p, MAY_WRITE, __func__);
e114e473
CS		 2166}
2167
2168/**
2169 * smack_task_getioprio - Smack check on reading ioprio
2170 * @p: the task object
2171 *
2172 * Return 0 if read access is permitted
2173 */
2174static int smack_task_getioprio(struct task_struct *p)
2175{
531f1d45 2176 return smk_curacc_on_task(p, MAY_READ, __func__);
e114e473
CS		 2177}
2178
2179/**
2180 * smack_task_setscheduler - Smack check on setting scheduler
2181 * @p: the task object
2182 * @policy: unused
2183 * @lp: unused
2184 *
2185 * Return 0 if read access is permitted
2186 */
b0ae1981 2187static int smack_task_setscheduler(struct task_struct *p)
e114e473 2188{
b1d9e6b0 2189 return smk_curacc_on_task(p, MAY_WRITE, __func__);
e114e473
CS		 2190}
2191
2192/**
2193 * smack_task_getscheduler - Smack check on reading scheduler
2194 * @p: the task object
2195 *
2196 * Return 0 if read access is permitted
2197 */
2198static int smack_task_getscheduler(struct task_struct *p)
2199{
531f1d45 2200 return smk_curacc_on_task(p, MAY_READ, __func__);
e114e473
CS		 2201}
2202
2203/**
2204 * smack_task_movememory - Smack check on moving memory
2205 * @p: the task object
2206 *
2207 * Return 0 if write access is permitted
2208 */
2209static int smack_task_movememory(struct task_struct *p)
2210{
531f1d45 2211 return smk_curacc_on_task(p, MAY_WRITE, __func__);
e114e473
CS		 2212}
2213
2214/**
2215 * smack_task_kill - Smack check on signal delivery
2216 * @p: the task object
2217 * @info: unused
2218 * @sig: unused
2219 * @secid: identifies the smack to use in lieu of current's
2220 *
2221 * Return 0 if write access is permitted
2222 *
2223 * The secid behavior is an artifact of an SELinux hack
2224 * in the USB code. Someday it may go away.
2225 */
2226static int smack_task_kill(struct task_struct *p, struct siginfo *info,
2227 int sig, u32 secid)
2228{
ecfcc53f 2229 struct smk_audit_info ad;
2f823ff8 2230 struct smack_known *skp;
6d1cff2a 2231 struct smack_known *tkp = smk_of_task_struct(p);
d166c802 2232 int rc;
ecfcc53f
EB		 2233
2234 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
2235 smk_ad_setfield_u_tsk(&ad, p);
e114e473
CS		 2236 /*
2237 * Sending a signal requires that the sender
2238 * can write the receiver.
2239 */
d166c802 2240 if (secid == 0) {
21c7eae2 2241 rc = smk_curacc(tkp, MAY_WRITE, &ad);
d166c802
CS		 2242 rc = smk_bu_task(p, MAY_WRITE, rc);
2243 return rc;
2244 }
e114e473
CS		 2245 /*
2246 * If the secid isn't 0 we're dealing with some USB IO
2247 * specific behavior. This is not clean. For one thing
2248 * we can't take privilege into account.
2249 */
2f823ff8 2250 skp = smack_from_secid(secid);
21c7eae2
LP		 2251 rc = smk_access(skp, tkp, MAY_WRITE, &ad);
2252 rc = smk_bu_note("USB signal", skp, tkp, MAY_WRITE, rc);
d166c802 2253 return rc;
e114e473
CS		 2254}
2255
2256/**
2257 * smack_task_wait - Smack access check for waiting
2258 * @p: task to wait for
2259 *
c00bedb3 2260 * Returns 0
e114e473
CS		 2261 */
2262static int smack_task_wait(struct task_struct *p)
2263{
e114e473 2264 /*
c00bedb3
CS		 2265 * Allow the operation to succeed.
2266 * Zombies are bad.
2267 * In userless environments (e.g. phones) programs
2268 * get marked with SMACK64EXEC and even if the parent
2269 * and child shouldn't be talking the parent still
2270 * may expect to know when the child exits.
e114e473 2271 */
c00bedb3 2272 return 0;
e114e473
CS		 2273}
2274
2275/**
2276 * smack_task_to_inode - copy task smack into the inode blob
2277 * @p: task to copy from
251a2a95 2278 * @inode: inode to copy to
e114e473
CS		 2279 *
2280 * Sets the smack pointer in the inode security blob
2281 */
2282static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
2283{
2284 struct inode_smack *isp = inode->i_security;
6d1cff2a 2285 struct smack_known *skp = smk_of_task_struct(p);
2f823ff8 2286
21c7eae2 2287 isp->smk_inode = skp;
e114e473
CS		 2288}
2289
2290/*
2291 * Socket hooks.
2292 */
2293
2294/**
2295 * smack_sk_alloc_security - Allocate a socket blob
2296 * @sk: the socket
2297 * @family: unused
251a2a95 2298 * @gfp_flags: memory allocation flags
e114e473
CS		 2299 *
2300 * Assign Smack pointers to current
2301 *
2302 * Returns 0 on success, -ENOMEM is there's no memory
2303 */
2304static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
2305{
2f823ff8 2306 struct smack_known *skp = smk_of_current();
e114e473
CS		 2307 struct socket_smack *ssp;
2308
2309 ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
2310 if (ssp == NULL)
2311 return -ENOMEM;
2312
54e70ec5 2313 ssp->smk_in = skp;
2f823ff8 2314 ssp->smk_out = skp;
272cd7a8 2315 ssp->smk_packet = NULL;
e114e473
CS		 2316
2317 sk->sk_security = ssp;
2318
2319 return 0;
2320}
2321
2322/**
2323 * smack_sk_free_security - Free a socket blob
2324 * @sk: the socket
2325 *
2326 * Clears the blob pointer
2327 */
2328static void smack_sk_free_security(struct sock *sk)
2329{
2330 kfree(sk->sk_security);
2331}
2332
07feee8f 2333/**
21abb1ec 2334* smack_ipv4host_label - check host based restrictions
07feee8f
PM		 2335* @sip: the object end
2336*
2337* looks for host based access restrictions
2338*
2339* This version will only be appropriate for really small sets of single label
2340* hosts. The caller is responsible for ensuring that the RCU read lock is
2341* taken before calling this function.
2342*
2343* Returns the label of the far end or NULL if it's not special.
2344*/
21abb1ec 2345static struct smack_known *smack_ipv4host_label(struct sockaddr_in *sip)
07feee8f 2346{
21abb1ec 2347 struct smk_net4addr *snp;
07feee8f
PM		 2348 struct in_addr *siap = &sip->sin_addr;
2349
2350 if (siap->s_addr == 0)
2351 return NULL;
2352
21abb1ec
CS		 2353 list_for_each_entry_rcu(snp, &smk_net4addr_list, list)
2354 /*
2355 * we break after finding the first match because
2356 * the list is sorted from longest to shortest mask
2357 * so we have found the most specific match
2358 */
2359 if (snp->smk_host.s_addr ==
2360 (siap->s_addr & snp->smk_mask.s_addr))
2361 return snp->smk_label;
2362
2363 return NULL;
2364}
2365
2366#if IS_ENABLED(CONFIG_IPV6)
2367/*
2368 * smk_ipv6_localhost - Check for local ipv6 host address
2369 * @sip: the address
2370 *
2371 * Returns boolean true if this is the localhost address
2372 */
2373static bool smk_ipv6_localhost(struct sockaddr_in6 *sip)
2374{
2375 __be16 *be16p = (__be16 *)&sip->sin6_addr;
2376 __be32 *be32p = (__be32 *)&sip->sin6_addr;
2377
2378 if (be32p[0] == 0 && be32p[1] == 0 && be32p[2] == 0 && be16p[6] == 0 &&
2379 ntohs(be16p[7]) == 1)
2380 return true;
2381 return false;
2382}
2383
2384/**
2385* smack_ipv6host_label - check host based restrictions
2386* @sip: the object end
2387*
2388* looks for host based access restrictions
2389*
2390* This version will only be appropriate for really small sets of single label
2391* hosts. The caller is responsible for ensuring that the RCU read lock is
2392* taken before calling this function.
2393*
2394* Returns the label of the far end or NULL if it's not special.
2395*/
2396static struct smack_known *smack_ipv6host_label(struct sockaddr_in6 *sip)
2397{
2398 struct smk_net6addr *snp;
2399 struct in6_addr *sap = &sip->sin6_addr;
2400 int i;
2401 int found = 0;
2402
2403 /*
2404 * It's local. Don't look for a host label.
2405 */
2406 if (smk_ipv6_localhost(sip))
2407 return NULL;
2408
2409 list_for_each_entry_rcu(snp, &smk_net6addr_list, list) {
07feee8f
PM		 2410 /*
2411 * we break after finding the first match because
2412 * the list is sorted from longest to shortest mask
2413 * so we have found the most specific match
2414 */
21abb1ec
CS		 2415 for (found = 1, i = 0; i < 8; i++) {
2416 /*
2417 * If the label is NULL the entry has
2418 * been renounced. Ignore it.
2419 */
2420 if (snp->smk_label == NULL)
2421 continue;
2422 if ((sap->s6_addr16[i] & snp->smk_mask.s6_addr16[i]) !=
2423 snp->smk_host.s6_addr16[i]) {
2424 found = 0;
2425 break;
2426 }
4303154e 2427 }
21abb1ec
CS		 2428 if (found)
2429 return snp->smk_label;
2430 }
07feee8f
PM		 2431
2432 return NULL;
2433}
21abb1ec 2434#endif /* CONFIG_IPV6 */
07feee8f 2435
e114e473
CS		 2436/**
2437 * smack_netlabel - Set the secattr on a socket
2438 * @sk: the socket
6d3dc07c 2439 * @labeled: socket label scheme
e114e473
CS		 2440 *
2441 * Convert the outbound smack value (smk_out) to a
2442 * secattr and attach it to the socket.
2443 *
2444 * Returns 0 on success or an error code
2445 */
6d3dc07c 2446static int smack_netlabel(struct sock *sk, int labeled)
e114e473 2447{
f7112e6c 2448 struct smack_known *skp;
07feee8f 2449 struct socket_smack *ssp = sk->sk_security;
6d3dc07c 2450 int rc = 0;
e114e473 2451
6d3dc07c
CS		 2452 /*
2453 * Usually the netlabel code will handle changing the
2454 * packet labeling based on the label.
2455 * The case of a single label host is different, because
2456 * a single label host should never get a labeled packet
2457 * even though the label is usually associated with a packet
2458 * label.
2459 */
2460 local_bh_disable();
2461 bh_lock_sock_nested(sk);
2462
2463 if (ssp->smk_out == smack_net_ambient ||
2464 labeled == SMACK_UNLABELED_SOCKET)
2465 netlbl_sock_delattr(sk);
2466 else {
2f823ff8 2467 skp = ssp->smk_out;
f7112e6c 2468 rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel);
6d3dc07c
CS		 2469 }
2470
2471 bh_unlock_sock(sk);
2472 local_bh_enable();
4bc87e62 2473
e114e473
CS		 2474 return rc;
2475}
2476
07feee8f
PM		 2477/**
2478 * smack_netlbel_send - Set the secattr on a socket and perform access checks
2479 * @sk: the socket
2480 * @sap: the destination address
2481 *
2482 * Set the correct secattr for the given socket based on the destination
2483 * address and perform any outbound access checks needed.
2484 *
2485 * Returns 0 on success or an error code.
2486 *
2487 */
2488static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap)
2489{
2f823ff8 2490 struct smack_known *skp;
07feee8f
PM		 2491 int rc;
2492 int sk_lbl;
21c7eae2 2493 struct smack_known *hkp;
07feee8f 2494 struct socket_smack *ssp = sk->sk_security;
ecfcc53f 2495 struct smk_audit_info ad;
07feee8f
PM		 2496
2497 rcu_read_lock();
21abb1ec 2498 hkp = smack_ipv4host_label(sap);
21c7eae2 2499 if (hkp != NULL) {
ecfcc53f 2500#ifdef CONFIG_AUDIT
923e9a13
KC		 2501 struct lsm_network_audit net;
2502
48c62af6
EP		 2503 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2504 ad.a.u.net->family = sap->sin_family;
2505 ad.a.u.net->dport = sap->sin_port;
2506 ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr;
ecfcc53f 2507#endif
923e9a13 2508 sk_lbl = SMACK_UNLABELED_SOCKET;
2f823ff8 2509 skp = ssp->smk_out;
21c7eae2
LP		 2510 rc = smk_access(skp, hkp, MAY_WRITE, &ad);
2511 rc = smk_bu_note("IPv4 host check", skp, hkp, MAY_WRITE, rc);
07feee8f
PM		 2512 } else {
2513 sk_lbl = SMACK_CIPSO_SOCKET;
2514 rc = 0;
2515 }
2516 rcu_read_unlock();
2517 if (rc != 0)
2518 return rc;
2519
2520 return smack_netlabel(sk, sk_lbl);
2521}
2522
21abb1ec
CS		 2523#if IS_ENABLED(CONFIG_IPV6)
2524/**
2525 * smk_ipv6_check - check Smack access
2526 * @subject: subject Smack label
2527 * @object: object Smack label
2528 * @address: address
2529 * @act: the action being taken
2530 *
2531 * Check an IPv6 access
2532 */
2533static int smk_ipv6_check(struct smack_known *subject,
2534 struct smack_known *object,
2535 struct sockaddr_in6 *address, int act)
2536{
2537#ifdef CONFIG_AUDIT
2538 struct lsm_network_audit net;
2539#endif
2540 struct smk_audit_info ad;
2541 int rc;
2542
2543#ifdef CONFIG_AUDIT
2544 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2545 ad.a.u.net->family = PF_INET6;
2546 ad.a.u.net->dport = ntohs(address->sin6_port);
2547 if (act == SMK_RECEIVING)
2548 ad.a.u.net->v6info.saddr = address->sin6_addr;
2549 else
2550 ad.a.u.net->v6info.daddr = address->sin6_addr;
2551#endif
2552 rc = smk_access(subject, object, MAY_WRITE, &ad);
2553 rc = smk_bu_note("IPv6 check", subject, object, MAY_WRITE, rc);
2554 return rc;
2555}
2556#endif /* CONFIG_IPV6 */
2557
2558#ifdef SMACK_IPV6_PORT_LABELING
c6739443
CS		 2559/**
2560 * smk_ipv6_port_label - Smack port access table management
2561 * @sock: socket
2562 * @address: address
2563 *
2564 * Create or update the port list entry
2565 */
2566static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address)
2567{
2568 struct sock *sk = sock->sk;
2569 struct sockaddr_in6 *addr6;
2570 struct socket_smack *ssp = sock->sk->sk_security;
2571 struct smk_port_label *spp;
2572 unsigned short port = 0;
2573
2574 if (address == NULL) {
2575 /*
2576 * This operation is changing the Smack information
2577 * on the bound socket. Take the changes to the port
2578 * as well.
2579 */
2580 list_for_each_entry(spp, &smk_ipv6_port_list, list) {
2581 if (sk != spp->smk_sock)
2582 continue;
2583 spp->smk_in = ssp->smk_in;
2584 spp->smk_out = ssp->smk_out;
2585 return;
2586 }
2587 /*
2588 * A NULL address is only used for updating existing
2589 * bound entries. If there isn't one, it's OK.
2590 */
2591 return;
2592 }
2593
2594 addr6 = (struct sockaddr_in6 *)address;
2595 port = ntohs(addr6->sin6_port);
2596 /*
2597 * This is a special case that is safely ignored.
2598 */
2599 if (port == 0)
2600 return;
2601
2602 /*
2603 * Look for an existing port list entry.
2604 * This is an indication that a port is getting reused.
2605 */
2606 list_for_each_entry(spp, &smk_ipv6_port_list, list) {
2607 if (spp->smk_port != port)
2608 continue;
2609 spp->smk_port = port;
2610 spp->smk_sock = sk;
2611 spp->smk_in = ssp->smk_in;
2612 spp->smk_out = ssp->smk_out;
2613 return;
2614 }
2615
2616 /*
2617 * A new port entry is required.
2618 */
2619 spp = kzalloc(sizeof(*spp), GFP_KERNEL);
2620 if (spp == NULL)
2621 return;
2622
2623 spp->smk_port = port;
2624 spp->smk_sock = sk;
2625 spp->smk_in = ssp->smk_in;
2626 spp->smk_out = ssp->smk_out;
2627
2628 list_add(&spp->list, &smk_ipv6_port_list);
2629 return;
2630}
2631
2632/**
2633 * smk_ipv6_port_check - check Smack port access
2634 * @sock: socket
2635 * @address: address
2636 *
2637 * Create or update the port list entry
2638 */
6ea06247 2639static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address,
c6739443
CS		 2640 int act)
2641{
c6739443
CS		 2642 struct smk_port_label *spp;
2643 struct socket_smack *ssp = sk->sk_security;
21abb1ec
CS		 2644 struct smack_known *skp = NULL;
2645 unsigned short port;
21c7eae2 2646 struct smack_known *object;
c6739443
CS		 2647
2648 if (act == SMK_RECEIVING) {
21abb1ec 2649 skp = smack_ipv6host_label(address);
21c7eae2 2650 object = ssp->smk_in;
c6739443 2651 } else {
2f823ff8 2652 skp = ssp->smk_out;
21abb1ec 2653 object = smack_ipv6host_label(address);
c6739443
CS		 2654 }
2655
2656 /*
21abb1ec 2657 * The other end is a single label host.
c6739443 2658 */
21abb1ec
CS		 2659 if (skp != NULL && object != NULL)
2660 return smk_ipv6_check(skp, object, address, act);
2661 if (skp == NULL)
2662 skp = smack_net_ambient;
2663 if (object == NULL)
2664 object = smack_net_ambient;
c6739443
CS		 2665
2666 /*
2667 * It's remote, so port lookup does no good.
2668 */
21abb1ec
CS		 2669 if (!smk_ipv6_localhost(address))
2670 return smk_ipv6_check(skp, object, address, act);
c6739443
CS		 2671
2672 /*
2673 * It's local so the send check has to have passed.
2674 */
21abb1ec
CS		 2675 if (act == SMK_RECEIVING)
2676 return 0;
c6739443 2677
21abb1ec 2678 port = ntohs(address->sin6_port);
c6739443
CS		 2679 list_for_each_entry(spp, &smk_ipv6_port_list, list) {
2680 if (spp->smk_port != port)
2681 continue;
21c7eae2 2682 object = spp->smk_in;
c6739443 2683 if (act == SMK_CONNECTING)
54e70ec5 2684 ssp->smk_packet = spp->smk_out;
c6739443
CS		 2685 break;
2686 }
2687
21abb1ec 2688 return smk_ipv6_check(skp, object, address, act);
c6739443 2689}
21abb1ec 2690#endif /* SMACK_IPV6_PORT_LABELING */
c6739443 2691
e114e473
CS		 2692/**
2693 * smack_inode_setsecurity - set smack xattrs
2694 * @inode: the object
2695 * @name: attribute name
2696 * @value: attribute value
2697 * @size: size of the attribute
2698 * @flags: unused
2699 *
2700 * Sets the named attribute in the appropriate blob
2701 *
2702 * Returns 0 on success, or an error code
2703 */
2704static int smack_inode_setsecurity(struct inode *inode, const char *name,
2705 const void *value, size_t size, int flags)
2706{
2f823ff8 2707 struct smack_known *skp;
e114e473
CS		 2708 struct inode_smack *nsp = inode->i_security;
2709 struct socket_smack *ssp;
2710 struct socket *sock;
4bc87e62 2711 int rc = 0;
e114e473 2712
f7112e6c 2713 if (value == NULL || size > SMK_LONGLABEL || size == 0)
5e9ab593 2714 return -EINVAL;
e114e473 2715
2f823ff8 2716 skp = smk_import_entry(value, size);
e774ad68
LP		 2717 if (IS_ERR(skp))
2718 return PTR_ERR(skp);
e114e473
CS		 2719
2720 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
21c7eae2 2721 nsp->smk_inode = skp;
ddd29ec6 2722 nsp->smk_flags |= SMK_INODE_INSTANT;
e114e473
CS		 2723 return 0;
2724 }
2725 /*
2726 * The rest of the Smack xattrs are only on sockets.
2727 */
2728 if (inode->i_sb->s_magic != SOCKFS_MAGIC)
2729 return -EOPNOTSUPP;
2730
2731 sock = SOCKET_I(inode);
2e1d146a 2732 if (sock == NULL || sock->sk == NULL)
e114e473
CS		 2733 return -EOPNOTSUPP;
2734
2735 ssp = sock->sk->sk_security;
2736
2737 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
54e70ec5 2738 ssp->smk_in = skp;
e114e473 2739 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) {
2f823ff8 2740 ssp->smk_out = skp;
c6739443 2741 if (sock->sk->sk_family == PF_INET) {
b4e0d5f0
CS		 2742 rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
2743 if (rc != 0)
2744 printk(KERN_WARNING
2745 "Smack: \"%s\" netlbl error %d.\n",
2746 __func__, -rc);
2747 }
e114e473
CS		 2748 } else
2749 return -EOPNOTSUPP;
2750
21abb1ec 2751#ifdef SMACK_IPV6_PORT_LABELING
c6739443
CS		 2752 if (sock->sk->sk_family == PF_INET6)
2753 smk_ipv6_port_label(sock, NULL);
21abb1ec 2754#endif
c6739443 2755
e114e473
CS		 2756 return 0;
2757}
2758
2759/**
2760 * smack_socket_post_create - finish socket setup
2761 * @sock: the socket
2762 * @family: protocol family
2763 * @type: unused
2764 * @protocol: unused
2765 * @kern: unused
2766 *
2767 * Sets the netlabel information on the socket
2768 *
2769 * Returns 0 on success, and error code otherwise
2770 */
2771static int smack_socket_post_create(struct socket *sock, int family,
2772 int type, int protocol, int kern)
2773{
7412301b
ML		 2774 struct socket_smack *ssp;
2775
2776 if (sock->sk == NULL)
2777 return 0;
2778
2779 /*
2780 * Sockets created by kernel threads receive web label.
2781 */
2782 if (unlikely(current->flags & PF_KTHREAD)) {
2783 ssp = sock->sk->sk_security;
2784 ssp->smk_in = &smack_known_web;
2785 ssp->smk_out = &smack_known_web;
2786 }
2787
2788 if (family != PF_INET)
e114e473
CS		 2789 return 0;
2790 /*
2791 * Set the outbound netlbl.
2792 */
6d3dc07c
CS		 2793 return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
2794}
2795
21abb1ec 2796#ifdef SMACK_IPV6_PORT_LABELING
c6739443
CS		 2797/**
2798 * smack_socket_bind - record port binding information.
2799 * @sock: the socket
2800 * @address: the port address
2801 * @addrlen: size of the address
2802 *
2803 * Records the label bound to a port.
2804 *
2805 * Returns 0
2806 */
2807static int smack_socket_bind(struct socket *sock, struct sockaddr *address,
2808 int addrlen)
2809{
2810 if (sock->sk != NULL && sock->sk->sk_family == PF_INET6)
2811 smk_ipv6_port_label(sock, address);
c6739443
CS		 2812 return 0;
2813}
21abb1ec 2814#endif /* SMACK_IPV6_PORT_LABELING */
c6739443 2815
6d3dc07c
CS		 2816/**
2817 * smack_socket_connect - connect access check
2818 * @sock: the socket
2819 * @sap: the other end
2820 * @addrlen: size of sap
2821 *
2822 * Verifies that a connection may be possible
2823 *
2824 * Returns 0 on success, and error code otherwise
2825 */
2826static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
2827 int addrlen)
2828{
c6739443 2829 int rc = 0;
21abb1ec
CS		 2830#if IS_ENABLED(CONFIG_IPV6)
2831 struct sockaddr_in6 *sip = (struct sockaddr_in6 *)sap;
2832#endif
2833#ifdef SMACK_IPV6_SECMARK_LABELING
2834 struct smack_known *rsp;
2835 struct socket_smack *ssp = sock->sk->sk_security;
2836#endif
c6739443
CS		 2837
2838 if (sock->sk == NULL)
6d3dc07c 2839 return 0;
6d3dc07c 2840
c6739443
CS		 2841 switch (sock->sk->sk_family) {
2842 case PF_INET:
2843 if (addrlen < sizeof(struct sockaddr_in))
2844 return -EINVAL;
2845 rc = smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap);
2846 break;
2847 case PF_INET6:
2848 if (addrlen < sizeof(struct sockaddr_in6))
2849 return -EINVAL;
21abb1ec
CS		 2850#ifdef SMACK_IPV6_SECMARK_LABELING
2851 rsp = smack_ipv6host_label(sip);
2852 if (rsp != NULL)
2853 rc = smk_ipv6_check(ssp->smk_out, rsp, sip,
6ea06247 2854 SMK_CONNECTING);
21abb1ec
CS		 2855#endif
2856#ifdef SMACK_IPV6_PORT_LABELING
2857 rc = smk_ipv6_port_check(sock->sk, sip, SMK_CONNECTING);
2858#endif
c6739443
CS		 2859 break;
2860 }
2861 return rc;
e114e473
CS		 2862}
2863
2864/**
2865 * smack_flags_to_may - convert S_ to MAY_ values
2866 * @flags: the S_ value
2867 *
2868 * Returns the equivalent MAY_ value
2869 */
2870static int smack_flags_to_may(int flags)
2871{
2872 int may = 0;
2873
2874 if (flags & S_IRUGO)
2875 may |= MAY_READ;
2876 if (flags & S_IWUGO)
2877 may |= MAY_WRITE;
2878 if (flags & S_IXUGO)
2879 may |= MAY_EXEC;
2880
2881 return may;
2882}
2883
2884/**
2885 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
2886 * @msg: the object
2887 *
2888 * Returns 0
2889 */
2890static int smack_msg_msg_alloc_security(struct msg_msg *msg)
2891{
2f823ff8
CS		 2892 struct smack_known *skp = smk_of_current();
2893
21c7eae2 2894 msg->security = skp;
e114e473
CS		 2895 return 0;
2896}
2897
2898/**
2899 * smack_msg_msg_free_security - Clear the security blob for msg_msg
2900 * @msg: the object
2901 *
2902 * Clears the blob pointer
2903 */
2904static void smack_msg_msg_free_security(struct msg_msg *msg)
2905{
2906 msg->security = NULL;
2907}
2908
2909/**
2910 * smack_of_shm - the smack pointer for the shm
2911 * @shp: the object
2912 *
2913 * Returns a pointer to the smack value
2914 */
21c7eae2 2915static struct smack_known *smack_of_shm(struct shmid_kernel *shp)
e114e473 2916{
21c7eae2 2917 return (struct smack_known *)shp->shm_perm.security;
e114e473
CS		 2918}
2919
2920/**
2921 * smack_shm_alloc_security - Set the security blob for shm
2922 * @shp: the object
2923 *
2924 * Returns 0
2925 */
2926static int smack_shm_alloc_security(struct shmid_kernel *shp)
2927{
2928 struct kern_ipc_perm *isp = &shp->shm_perm;
2f823ff8 2929 struct smack_known *skp = smk_of_current();
e114e473 2930
21c7eae2 2931 isp->security = skp;
e114e473
CS		 2932 return 0;
2933}
2934
2935/**
2936 * smack_shm_free_security - Clear the security blob for shm
2937 * @shp: the object
2938 *
2939 * Clears the blob pointer
2940 */
2941static void smack_shm_free_security(struct shmid_kernel *shp)
2942{
2943 struct kern_ipc_perm *isp = &shp->shm_perm;
2944
2945 isp->security = NULL;
2946}
2947
ecfcc53f
EB		 2948/**
2949 * smk_curacc_shm : check if current has access on shm
2950 * @shp : the object
2951 * @access : access requested
2952 *
2953 * Returns 0 if current has the requested access, error code otherwise
2954 */
2955static int smk_curacc_shm(struct shmid_kernel *shp, int access)
2956{
21c7eae2 2957 struct smack_known *ssp = smack_of_shm(shp);
ecfcc53f 2958 struct smk_audit_info ad;
d166c802 2959 int rc;
ecfcc53f
EB		 2960
2961#ifdef CONFIG_AUDIT
2962 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2963 ad.a.u.ipc_id = shp->shm_perm.id;
2964#endif
d166c802
CS		 2965 rc = smk_curacc(ssp, access, &ad);
2966 rc = smk_bu_current("shm", ssp, access, rc);
2967 return rc;
ecfcc53f
EB		 2968}
2969
e114e473
CS		 2970/**
2971 * smack_shm_associate - Smack access check for shm
2972 * @shp: the object
2973 * @shmflg: access requested
2974 *
2975 * Returns 0 if current has the requested access, error code otherwise
2976 */
2977static int smack_shm_associate(struct shmid_kernel *shp, int shmflg)
2978{
e114e473
CS		 2979 int may;
2980
2981 may = smack_flags_to_may(shmflg);
ecfcc53f 2982 return smk_curacc_shm(shp, may);
e114e473
CS		 2983}
2984
2985/**
2986 * smack_shm_shmctl - Smack access check for shm
2987 * @shp: the object
2988 * @cmd: what it wants to do
2989 *
2990 * Returns 0 if current has the requested access, error code otherwise
2991 */
2992static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd)
2993{
e114e473
CS		 2994 int may;
2995
2996 switch (cmd) {
2997 case IPC_STAT:
2998 case SHM_STAT:
2999 may = MAY_READ;
3000 break;
3001 case IPC_SET:
3002 case SHM_LOCK:
3003 case SHM_UNLOCK:
3004 case IPC_RMID:
3005 may = MAY_READWRITE;
3006 break;
3007 case IPC_INFO:
3008 case SHM_INFO:
3009 /*
3010 * System level information.
3011 */
3012 return 0;
3013 default:
3014 return -EINVAL;
3015 }
ecfcc53f 3016 return smk_curacc_shm(shp, may);
e114e473
CS		 3017}
3018
3019/**
3020 * smack_shm_shmat - Smack access for shmat
3021 * @shp: the object
3022 * @shmaddr: unused
3023 * @shmflg: access requested
3024 *
3025 * Returns 0 if current has the requested access, error code otherwise
3026 */
3027static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr,
3028 int shmflg)
3029{
e114e473
CS		 3030 int may;
3031
3032 may = smack_flags_to_may(shmflg);
ecfcc53f 3033 return smk_curacc_shm(shp, may);
e114e473
CS		 3034}
3035
3036/**
3037 * smack_of_sem - the smack pointer for the sem
3038 * @sma: the object
3039 *
3040 * Returns a pointer to the smack value
3041 */
21c7eae2 3042static struct smack_known *smack_of_sem(struct sem_array *sma)
e114e473 3043{
21c7eae2 3044 return (struct smack_known *)sma->sem_perm.security;
e114e473
CS		 3045}
3046
3047/**
3048 * smack_sem_alloc_security - Set the security blob for sem
3049 * @sma: the object
3050 *
3051 * Returns 0
3052 */
3053static int smack_sem_alloc_security(struct sem_array *sma)
3054{
3055 struct kern_ipc_perm *isp = &sma->sem_perm;
2f823ff8 3056 struct smack_known *skp = smk_of_current();
e114e473 3057
21c7eae2 3058 isp->security = skp;
e114e473
CS		 3059 return 0;
3060}
3061
3062/**
3063 * smack_sem_free_security - Clear the security blob for sem
3064 * @sma: the object
3065 *
3066 * Clears the blob pointer
3067 */
3068static void smack_sem_free_security(struct sem_array *sma)
3069{
3070 struct kern_ipc_perm *isp = &sma->sem_perm;
3071
3072 isp->security = NULL;
3073}
3074
ecfcc53f
EB		 3075/**
3076 * smk_curacc_sem : check if current has access on sem
3077 * @sma : the object
3078 * @access : access requested
3079 *
3080 * Returns 0 if current has the requested access, error code otherwise
3081 */
3082static int smk_curacc_sem(struct sem_array *sma, int access)
3083{
21c7eae2 3084 struct smack_known *ssp = smack_of_sem(sma);
ecfcc53f 3085 struct smk_audit_info ad;
d166c802 3086 int rc;
ecfcc53f
EB		 3087
3088#ifdef CONFIG_AUDIT
3089 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3090 ad.a.u.ipc_id = sma->sem_perm.id;
3091#endif
d166c802
CS		 3092 rc = smk_curacc(ssp, access, &ad);
3093 rc = smk_bu_current("sem", ssp, access, rc);
3094 return rc;
ecfcc53f
EB		 3095}
3096
e114e473
CS		 3097/**
3098 * smack_sem_associate - Smack access check for sem
3099 * @sma: the object
3100 * @semflg: access requested
3101 *
3102 * Returns 0 if current has the requested access, error code otherwise
3103 */
3104static int smack_sem_associate(struct sem_array *sma, int semflg)
3105{
e114e473
CS		 3106 int may;
3107
3108 may = smack_flags_to_may(semflg);
ecfcc53f 3109 return smk_curacc_sem(sma, may);
e114e473
CS		 3110}
3111
3112/**
3113 * smack_sem_shmctl - Smack access check for sem
3114 * @sma: the object
3115 * @cmd: what it wants to do
3116 *
3117 * Returns 0 if current has the requested access, error code otherwise
3118 */
3119static int smack_sem_semctl(struct sem_array *sma, int cmd)
3120{
e114e473
CS		 3121 int may;
3122
3123 switch (cmd) {
3124 case GETPID:
3125 case GETNCNT:
3126 case GETZCNT:
3127 case GETVAL:
3128 case GETALL:
3129 case IPC_STAT:
3130 case SEM_STAT:
3131 may = MAY_READ;
3132 break;
3133 case SETVAL:
3134 case SETALL:
3135 case IPC_RMID:
3136 case IPC_SET:
3137 may = MAY_READWRITE;
3138 break;
3139 case IPC_INFO:
3140 case SEM_INFO:
3141 /*
3142 * System level information
3143 */
3144 return 0;
3145 default:
3146 return -EINVAL;
3147 }
3148
ecfcc53f 3149 return smk_curacc_sem(sma, may);
e114e473
CS		 3150}
3151
3152/**
3153 * smack_sem_semop - Smack checks of semaphore operations
3154 * @sma: the object
3155 * @sops: unused
3156 * @nsops: unused
3157 * @alter: unused
3158 *
3159 * Treated as read and write in all cases.
3160 *
3161 * Returns 0 if access is allowed, error code otherwise
3162 */
3163static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops,
3164 unsigned nsops, int alter)
3165{
ecfcc53f 3166 return smk_curacc_sem(sma, MAY_READWRITE);
e114e473
CS		 3167}
3168
3169/**
3170 * smack_msg_alloc_security - Set the security blob for msg
3171 * @msq: the object
3172 *
3173 * Returns 0
3174 */
3175static int smack_msg_queue_alloc_security(struct msg_queue *msq)
3176{
3177 struct kern_ipc_perm *kisp = &msq->q_perm;
2f823ff8 3178 struct smack_known *skp = smk_of_current();
e114e473 3179
21c7eae2 3180 kisp->security = skp;
e114e473
CS		 3181 return 0;
3182}
3183
3184/**
3185 * smack_msg_free_security - Clear the security blob for msg
3186 * @msq: the object
3187 *
3188 * Clears the blob pointer
3189 */
3190static void smack_msg_queue_free_security(struct msg_queue *msq)
3191{
3192 struct kern_ipc_perm *kisp = &msq->q_perm;
3193
3194 kisp->security = NULL;
3195}
3196
3197/**
3198 * smack_of_msq - the smack pointer for the msq
3199 * @msq: the object
3200 *
21c7eae2 3201 * Returns a pointer to the smack label entry
e114e473 3202 */
21c7eae2 3203static struct smack_known *smack_of_msq(struct msg_queue *msq)
e114e473 3204{
21c7eae2 3205 return (struct smack_known *)msq->q_perm.security;
e114e473
CS		 3206}
3207
ecfcc53f
EB		 3208/**
3209 * smk_curacc_msq : helper to check if current has access on msq
3210 * @msq : the msq
3211 * @access : access requested
3212 *
3213 * return 0 if current has access, error otherwise
3214 */
3215static int smk_curacc_msq(struct msg_queue *msq, int access)
3216{
21c7eae2 3217 struct smack_known *msp = smack_of_msq(msq);
ecfcc53f 3218 struct smk_audit_info ad;
d166c802 3219 int rc;
ecfcc53f
EB		 3220
3221#ifdef CONFIG_AUDIT
3222 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3223 ad.a.u.ipc_id = msq->q_perm.id;
3224#endif
d166c802
CS		 3225 rc = smk_curacc(msp, access, &ad);
3226 rc = smk_bu_current("msq", msp, access, rc);
3227 return rc;
ecfcc53f
EB		 3228}
3229
e114e473
CS		 3230/**
3231 * smack_msg_queue_associate - Smack access check for msg_queue
3232 * @msq: the object
3233 * @msqflg: access requested
3234 *
3235 * Returns 0 if current has the requested access, error code otherwise
3236 */
3237static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg)
3238{
e114e473
CS		 3239 int may;
3240
3241 may = smack_flags_to_may(msqflg);
ecfcc53f 3242 return smk_curacc_msq(msq, may);
e114e473
CS		 3243}
3244
3245/**
3246 * smack_msg_queue_msgctl - Smack access check for msg_queue
3247 * @msq: the object
3248 * @cmd: what it wants to do
3249 *
3250 * Returns 0 if current has the requested access, error code otherwise
3251 */
3252static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd)
3253{
e114e473
CS		 3254 int may;
3255
3256 switch (cmd) {
3257 case IPC_STAT:
3258 case MSG_STAT:
3259 may = MAY_READ;
3260 break;
3261 case IPC_SET:
3262 case IPC_RMID:
3263 may = MAY_READWRITE;
3264 break;
3265 case IPC_INFO:
3266 case MSG_INFO:
3267 /*
3268 * System level information
3269 */
3270 return 0;
3271 default:
3272 return -EINVAL;
3273 }
3274
ecfcc53f 3275 return smk_curacc_msq(msq, may);
e114e473
CS		 3276}
3277
3278/**
3279 * smack_msg_queue_msgsnd - Smack access check for msg_queue
3280 * @msq: the object
3281 * @msg: unused
3282 * @msqflg: access requested
3283 *
3284 * Returns 0 if current has the requested access, error code otherwise
3285 */
3286static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg,
3287 int msqflg)
3288{
ecfcc53f 3289 int may;
e114e473 3290
ecfcc53f
EB		 3291 may = smack_flags_to_may(msqflg);
3292 return smk_curacc_msq(msq, may);
e114e473
CS		 3293}
3294
3295/**
3296 * smack_msg_queue_msgsnd - Smack access check for msg_queue
3297 * @msq: the object
3298 * @msg: unused
3299 * @target: unused
3300 * @type: unused
3301 * @mode: unused
3302 *
3303 * Returns 0 if current has read and write access, error code otherwise
3304 */
3305static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
3306 struct task_struct *target, long type, int mode)
3307{
ecfcc53f 3308 return smk_curacc_msq(msq, MAY_READWRITE);
e114e473
CS		 3309}
3310
3311/**
3312 * smack_ipc_permission - Smack access for ipc_permission()
3313 * @ipp: the object permissions
3314 * @flag: access requested
3315 *
3316 * Returns 0 if current has read and write access, error code otherwise
3317 */
3318static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
3319{
21c7eae2 3320 struct smack_known *iskp = ipp->security;
ecfcc53f
EB		 3321 int may = smack_flags_to_may(flag);
3322 struct smk_audit_info ad;
d166c802 3323 int rc;
e114e473 3324
ecfcc53f
EB		 3325#ifdef CONFIG_AUDIT
3326 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3327 ad.a.u.ipc_id = ipp->id;
3328#endif
21c7eae2
LP		 3329 rc = smk_curacc(iskp, may, &ad);
3330 rc = smk_bu_current("svipc", iskp, may, rc);
d166c802 3331 return rc;
e114e473
CS		 3332}
3333
d20bdda6
AD		 3334/**
3335 * smack_ipc_getsecid - Extract smack security id
251a2a95 3336 * @ipp: the object permissions
d20bdda6
AD		 3337 * @secid: where result will be saved
3338 */
3339static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid)
3340{
21c7eae2 3341 struct smack_known *iskp = ipp->security;
d20bdda6 3342
21c7eae2 3343 *secid = iskp->smk_secid;
d20bdda6
AD		 3344}
3345
e114e473
CS		 3346/**
3347 * smack_d_instantiate - Make sure the blob is correct on an inode
3e62cbb8 3348 * @opt_dentry: dentry where inode will be attached
e114e473
CS		 3349 * @inode: the object
3350 *
3351 * Set the inode's security blob if it hasn't been done already.
3352 */
3353static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
3354{
3355 struct super_block *sbp;
3356 struct superblock_smack *sbsp;
3357 struct inode_smack *isp;
2f823ff8
CS		 3358 struct smack_known *skp;
3359 struct smack_known *ckp = smk_of_current();
21c7eae2 3360 struct smack_known *final;
5c6d1125
JS		 3361 char trattr[TRANS_TRUE_SIZE];
3362 int transflag = 0;
2267b13a 3363 int rc;
e114e473
CS		 3364 struct dentry *dp;
3365
3366 if (inode == NULL)
3367 return;
3368
3369 isp = inode->i_security;
3370
3371 mutex_lock(&isp->smk_lock);
3372 /*
3373 * If the inode is already instantiated
3374 * take the quick way out
3375 */
3376 if (isp->smk_flags & SMK_INODE_INSTANT)
3377 goto unlockandout;
3378
3379 sbp = inode->i_sb;
3380 sbsp = sbp->s_security;
3381 /*
3382 * We're going to use the superblock default label
3383 * if there's no label on the file.
3384 */
3385 final = sbsp->smk_default;
3386
e97dcb0e
CS		 3387 /*
3388 * If this is the root inode the superblock
3389 * may be in the process of initialization.
3390 * If that is the case use the root value out
3391 * of the superblock.
3392 */
3393 if (opt_dentry->d_parent == opt_dentry) {
1d8c2326
ŁS		 3394 switch (sbp->s_magic) {
3395 case CGROUP_SUPER_MAGIC:
36ea735b
CS		 3396 /*
3397 * The cgroup filesystem is never mounted,
3398 * so there's no opportunity to set the mount
3399 * options.
3400 */
21c7eae2
LP		 3401 sbsp->smk_root = &smack_known_star;
3402 sbsp->smk_default = &smack_known_star;
1d8c2326
ŁS		 3403 isp->smk_inode = sbsp->smk_root;
3404 break;
3405 case TMPFS_MAGIC:
3406 /*
3407 * What about shmem/tmpfs anonymous files with dentry
3408 * obtained from d_alloc_pseudo()?
3409 */
3410 isp->smk_inode = smk_of_current();
3411 break;
8da4aba5
RK		 3412 case PIPEFS_MAGIC:
3413 isp->smk_inode = smk_of_current();
3414 break;
1d8c2326
ŁS		 3415 default:
3416 isp->smk_inode = sbsp->smk_root;
3417 break;
36ea735b 3418 }
e97dcb0e
CS		 3419 isp->smk_flags |= SMK_INODE_INSTANT;
3420 goto unlockandout;
3421 }
3422
e114e473
CS		 3423 /*
3424 * This is pretty hackish.
3425 * Casey says that we shouldn't have to do
3426 * file system specific code, but it does help
3427 * with keeping it simple.
3428 */
3429 switch (sbp->s_magic) {
3430 case SMACK_MAGIC:
36ea735b
CS		 3431 case PIPEFS_MAGIC:
3432 case SOCKFS_MAGIC:
3433 case CGROUP_SUPER_MAGIC:
e114e473 3434 /*
25985edc 3435 * Casey says that it's a little embarrassing
e114e473
CS		 3436 * that the smack file system doesn't do
3437 * extended attributes.
36ea735b 3438 *
e114e473 3439 * Casey says pipes are easy (?)
36ea735b
CS		 3440 *
3441 * Socket access is controlled by the socket
3442 * structures associated with the task involved.
3443 *
3444 * Cgroupfs is special
e114e473 3445 */
21c7eae2 3446 final = &smack_known_star;
e114e473
CS		 3447 break;
3448 case DEVPTS_SUPER_MAGIC:
3449 /*
3450 * devpts seems content with the label of the task.
3451 * Programs that change smack have to treat the
3452 * pty with respect.
3453 */
21c7eae2 3454 final = ckp;
e114e473 3455 break;
e114e473
CS		 3456 case PROC_SUPER_MAGIC:
3457 /*
3458 * Casey says procfs appears not to care.
3459 * The superblock default suffices.
3460 */
3461 break;
3462 case TMPFS_MAGIC:
3463 /*
3464 * Device labels should come from the filesystem,
3465 * but watch out, because they're volitile,
3466 * getting recreated on every reboot.
3467 */
21c7eae2 3468 final = &smack_known_star;
e114e473
CS		 3469 /*
3470 * No break.
3471 *
3472 * If a smack value has been set we want to use it,
3473 * but since tmpfs isn't giving us the opportunity
3474 * to set mount options simulate setting the
3475 * superblock default.
3476 */
3477 default:
3478 /*
3479 * This isn't an understood special case.
3480 * Get the value from the xattr.
b4e0d5f0
CS		 3481 */
3482
3483 /*
3484 * UNIX domain sockets use lower level socket data.
3485 */
3486 if (S_ISSOCK(inode->i_mode)) {
21c7eae2 3487 final = &smack_known_star;
b4e0d5f0
CS		 3488 break;
3489 }
3490 /*
e114e473
CS		 3491 * No xattr support means, alas, no SMACK label.
3492 * Use the aforeapplied default.
3493 * It would be curious if the label of the task
3494 * does not match that assigned.
3495 */
3496 if (inode->i_op->getxattr == NULL)
3497 break;
3498 /*
3499 * Get the dentry for xattr.
3500 */
3e62cbb8 3501 dp = dget(opt_dentry);
2f823ff8 3502 skp = smk_fetch(XATTR_NAME_SMACK, inode, dp);
e774ad68 3503 if (!IS_ERR_OR_NULL(skp))
21c7eae2 3504 final = skp;
2267b13a
CS		 3505
3506 /*
3507 * Transmuting directory
3508 */
3509 if (S_ISDIR(inode->i_mode)) {
3510 /*
3511 * If this is a new directory and the label was
3512 * transmuted when the inode was initialized
3513 * set the transmute attribute on the directory
3514 * and mark the inode.
3515 *
3516 * If there is a transmute attribute on the
3517 * directory mark the inode.
3518 */
3519 if (isp->smk_flags & SMK_INODE_CHANGED) {
3520 isp->smk_flags &= ~SMK_INODE_CHANGED;
3521 rc = inode->i_op->setxattr(dp,
5c6d1125 3522 XATTR_NAME_SMACKTRANSMUTE,
2267b13a
CS		 3523 TRANS_TRUE, TRANS_TRUE_SIZE,
3524 0);
3525 } else {
3526 rc = inode->i_op->getxattr(dp,
3527 XATTR_NAME_SMACKTRANSMUTE, trattr,
3528 TRANS_TRUE_SIZE);
3529 if (rc >= 0 && strncmp(trattr, TRANS_TRUE,
3530 TRANS_TRUE_SIZE) != 0)
3531 rc = -EINVAL;
5c6d1125 3532 }
2267b13a
CS		 3533 if (rc >= 0)
3534 transflag = SMK_INODE_TRANSMUTE;
5c6d1125 3535 }
19760ad0
CS		 3536 /*
3537 * Don't let the exec or mmap label be "*" or "@".
3538 */
3539 skp = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp);
e774ad68
LP		 3540 if (IS_ERR(skp) || skp == &smack_known_star ||
3541 skp == &smack_known_web)
19760ad0
CS		 3542 skp = NULL;
3543 isp->smk_task = skp;
e774ad68 3544
19760ad0 3545 skp = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp);
e774ad68
LP		 3546 if (IS_ERR(skp) || skp == &smack_known_star ||
3547 skp == &smack_known_web)
19760ad0
CS		 3548 skp = NULL;
3549 isp->smk_mmap = skp;
676dac4b 3550
e114e473
CS		 3551 dput(dp);
3552 break;
3553 }
3554
3555 if (final == NULL)
21c7eae2 3556 isp->smk_inode = ckp;
e114e473
CS		 3557 else
3558 isp->smk_inode = final;
3559
5c6d1125 3560 isp->smk_flags |= (SMK_INODE_INSTANT | transflag);
e114e473
CS		 3561
3562unlockandout:
3563 mutex_unlock(&isp->smk_lock);
3564 return;
3565}
3566
3567/**
3568 * smack_getprocattr - Smack process attribute access
3569 * @p: the object task
3570 * @name: the name of the attribute in /proc/.../attr
3571 * @value: where to put the result
3572 *
3573 * Places a copy of the task Smack into value
3574 *
3575 * Returns the length of the smack label or an error code
3576 */
3577static int smack_getprocattr(struct task_struct *p, char *name, char **value)
3578{
6d1cff2a 3579 struct smack_known *skp = smk_of_task_struct(p);
e114e473
CS		 3580 char *cp;
3581 int slen;
3582
3583 if (strcmp(name, "current") != 0)
3584 return -EINVAL;
3585
2f823ff8 3586 cp = kstrdup(skp->smk_known, GFP_KERNEL);
e114e473
CS		 3587 if (cp == NULL)
3588 return -ENOMEM;
3589
3590 slen = strlen(cp);
3591 *value = cp;
3592 return slen;
3593}
3594
3595/**
3596 * smack_setprocattr - Smack process attribute setting
3597 * @p: the object task
3598 * @name: the name of the attribute in /proc/.../attr
3599 * @value: the value to set
3600 * @size: the size of the value
3601 *
3602 * Sets the Smack value of the task. Only setting self
3603 * is permitted and only with privilege
3604 *
3605 * Returns the length of the smack label or an error code
3606 */
3607static int smack_setprocattr(struct task_struct *p, char *name,
3608 void *value, size_t size)
3609{
38416e53 3610 struct task_smack *tsp = current_security();
d84f4f99 3611 struct cred *new;
2f823ff8 3612 struct smack_known *skp;
38416e53
ZJ		 3613 struct smack_known_list_elem *sklep;
3614 int rc;
e114e473 3615
e114e473
CS		 3616 /*
3617 * Changing another process' Smack value is too dangerous
3618 * and supports no sane use case.
3619 */
3620 if (p != current)
3621 return -EPERM;
3622
38416e53 3623 if (!smack_privileged(CAP_MAC_ADMIN) && list_empty(&tsp->smk_relabel))
5cd9c58f
DH		 3624 return -EPERM;
3625
f7112e6c 3626 if (value == NULL || size == 0 || size >= SMK_LONGLABEL)
e114e473
CS		 3627 return -EINVAL;
3628
3629 if (strcmp(name, "current") != 0)
3630 return -EINVAL;
3631
2f823ff8 3632 skp = smk_import_entry(value, size);
e774ad68
LP		 3633 if (IS_ERR(skp))
3634 return PTR_ERR(skp);
e114e473 3635
6d3dc07c
CS		 3636 /*
3637 * No process is ever allowed the web ("@") label.
3638 */
2f823ff8 3639 if (skp == &smack_known_web)
6d3dc07c
CS		 3640 return -EPERM;
3641
38416e53
ZJ		 3642 if (!smack_privileged(CAP_MAC_ADMIN)) {
3643 rc = -EPERM;
3644 list_for_each_entry(sklep, &tsp->smk_relabel, list)
3645 if (sklep->smk_label == skp) {
3646 rc = 0;
3647 break;
3648 }
3649 if (rc)
3650 return rc;
3651 }
3652
d84f4f99 3653 new = prepare_creds();
6d3dc07c 3654 if (new == NULL)
d84f4f99 3655 return -ENOMEM;
7898e1f8 3656
46a2f3b9 3657 tsp = new->security;
2f823ff8 3658 tsp->smk_task = skp;
38416e53
ZJ		 3659 /*
3660 * process can change its label only once
3661 */
3662 smk_destroy_label_list(&tsp->smk_relabel);
7898e1f8 3663
d84f4f99 3664 commit_creds(new);
e114e473
CS		 3665 return size;
3666}
3667
3668/**
3669 * smack_unix_stream_connect - Smack access on UDS
3610cda5
DM		 3670 * @sock: one sock
3671 * @other: the other sock
e114e473
CS		 3672 * @newsk: unused
3673 *
3674 * Return 0 if a subject with the smack of sock could access
3675 * an object with the smack of other, otherwise an error code
3676 */
3610cda5
DM		 3677static int smack_unix_stream_connect(struct sock *sock,
3678 struct sock *other, struct sock *newsk)
e114e473 3679{
2f823ff8 3680 struct smack_known *skp;
54e70ec5 3681 struct smack_known *okp;
d2e7ad19
JM		 3682 struct socket_smack *ssp = sock->sk_security;
3683 struct socket_smack *osp = other->sk_security;
975d5e55 3684 struct socket_smack *nsp = newsk->sk_security;
ecfcc53f 3685 struct smk_audit_info ad;
b4e0d5f0 3686 int rc = 0;
923e9a13
KC		 3687#ifdef CONFIG_AUDIT
3688 struct lsm_network_audit net;
923e9a13 3689#endif
b4e0d5f0 3690
2f823ff8
CS		 3691 if (!smack_privileged(CAP_MAC_OVERRIDE)) {
3692 skp = ssp->smk_out;
96be7b54 3693 okp = osp->smk_in;
54e70ec5
CS		 3694#ifdef CONFIG_AUDIT
3695 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3696 smk_ad_setfield_u_net_sk(&ad, other);
3697#endif
21c7eae2
LP		 3698 rc = smk_access(skp, okp, MAY_WRITE, &ad);
3699 rc = smk_bu_note("UDS connect", skp, okp, MAY_WRITE, rc);
d166c802 3700 if (rc == 0) {
96be7b54
ZJ		 3701 okp = osp->smk_out;
3702 skp = ssp->smk_in;
138a868f 3703 rc = smk_access(okp, skp, MAY_WRITE, &ad);
21c7eae2 3704 rc = smk_bu_note("UDS connect", okp, skp,
d166c802
CS		 3705 MAY_WRITE, rc);
3706 }
2f823ff8 3707 }
b4e0d5f0 3708
975d5e55
CS		 3709 /*
3710 * Cross reference the peer labels for SO_PEERSEC.
3711 */
3712 if (rc == 0) {
54e70ec5
CS		 3713 nsp->smk_packet = ssp->smk_out;
3714 ssp->smk_packet = osp->smk_out;
975d5e55
CS		 3715 }
3716
b4e0d5f0 3717 return rc;
e114e473
CS		 3718}
3719
3720/**
3721 * smack_unix_may_send - Smack access on UDS
3722 * @sock: one socket
3723 * @other: the other socket
3724 *
3725 * Return 0 if a subject with the smack of sock could access
3726 * an object with the smack of other, otherwise an error code
3727 */
3728static int smack_unix_may_send(struct socket *sock, struct socket *other)
3729{
b4e0d5f0
CS		 3730 struct socket_smack *ssp = sock->sk->sk_security;
3731 struct socket_smack *osp = other->sk->sk_security;
ecfcc53f 3732 struct smk_audit_info ad;
d166c802 3733 int rc;
e114e473 3734
923e9a13
KC		 3735#ifdef CONFIG_AUDIT
3736 struct lsm_network_audit net;
3737
48c62af6 3738 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
ecfcc53f 3739 smk_ad_setfield_u_net_sk(&ad, other->sk);
923e9a13 3740#endif
b4e0d5f0 3741
2f823ff8
CS		 3742 if (smack_privileged(CAP_MAC_OVERRIDE))
3743 return 0;
b4e0d5f0 3744
21c7eae2
LP		 3745 rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad);
3746 rc = smk_bu_note("UDS send", ssp->smk_out, osp->smk_in, MAY_WRITE, rc);
d166c802 3747 return rc;
e114e473
CS		 3748}
3749
6d3dc07c
CS		 3750/**
3751 * smack_socket_sendmsg - Smack check based on destination host
3752 * @sock: the socket
251a2a95 3753 * @msg: the message
6d3dc07c
CS		 3754 * @size: the size of the message
3755 *
c6739443
CS		 3756 * Return 0 if the current subject can write to the destination host.
3757 * For IPv4 this is only a question if the destination is a single label host.
3758 * For IPv6 this is a check against the label of the port.
6d3dc07c
CS		 3759 */
3760static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
3761 int size)
3762{
3763 struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name;
21abb1ec 3764#if IS_ENABLED(CONFIG_IPV6)
6ea06247 3765 struct sockaddr_in6 *sap = (struct sockaddr_in6 *) msg->msg_name;
21abb1ec
CS		 3766#endif
3767#ifdef SMACK_IPV6_SECMARK_LABELING
3768 struct socket_smack *ssp = sock->sk->sk_security;
3769 struct smack_known *rsp;
3770#endif
c6739443 3771 int rc = 0;
6d3dc07c
CS		 3772
3773 /*
3774 * Perfectly reasonable for this to be NULL
3775 */
c6739443 3776 if (sip == NULL)
6d3dc07c
CS		 3777 return 0;
3778
81bd0d56 3779 switch (sock->sk->sk_family) {
c6739443
CS		 3780 case AF_INET:
3781 rc = smack_netlabel_send(sock->sk, sip);
3782 break;
3783 case AF_INET6:
21abb1ec
CS		 3784#ifdef SMACK_IPV6_SECMARK_LABELING
3785 rsp = smack_ipv6host_label(sap);
3786 if (rsp != NULL)
3787 rc = smk_ipv6_check(ssp->smk_out, rsp, sap,
3788 SMK_CONNECTING);
3789#endif
3790#ifdef SMACK_IPV6_PORT_LABELING
c6739443 3791 rc = smk_ipv6_port_check(sock->sk, sap, SMK_SENDING);
21abb1ec 3792#endif
c6739443
CS		 3793 break;
3794 }
3795 return rc;
6d3dc07c
CS		 3796}
3797
e114e473 3798/**
251a2a95 3799 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
e114e473 3800 * @sap: netlabel secattr
272cd7a8 3801 * @ssp: socket security information
e114e473 3802 *
2f823ff8 3803 * Returns a pointer to a Smack label entry found on the label list.
e114e473 3804 */
2f823ff8
CS		 3805static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap,
3806 struct socket_smack *ssp)
e114e473 3807{
2f823ff8 3808 struct smack_known *skp;
f7112e6c 3809 int found = 0;
677264e8
CS		 3810 int acat;
3811 int kcat;
e114e473 3812
6d3dc07c 3813 if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) {
e114e473 3814 /*
6d3dc07c 3815 * Looks like a CIPSO packet.
e114e473
CS		 3816 * If there are flags but no level netlabel isn't
3817 * behaving the way we expect it to.
3818 *
f7112e6c 3819 * Look it up in the label table
e114e473
CS		 3820 * Without guidance regarding the smack value
3821 * for the packet fall back on the network
3822 * ambient value.
3823 */
f7112e6c 3824 rcu_read_lock();
2f823ff8
CS		 3825 list_for_each_entry(skp, &smack_known_list, list) {
3826 if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl)
f7112e6c 3827 continue;
677264e8
CS		 3828 /*
3829 * Compare the catsets. Use the netlbl APIs.
3830 */
3831 if ((sap->flags & NETLBL_SECATTR_MLS_CAT) == 0) {
3832 if ((skp->smk_netlabel.flags &
3833 NETLBL_SECATTR_MLS_CAT) == 0)
3834 found = 1;
3835 break;
3836 }
3837 for (acat = -1, kcat = -1; acat == kcat; ) {
4fbe63d1
PM		 3838 acat = netlbl_catmap_walk(sap->attr.mls.cat,
3839 acat + 1);
3840 kcat = netlbl_catmap_walk(
677264e8
CS		 3841 skp->smk_netlabel.attr.mls.cat,
3842 kcat + 1);
3843 if (acat < 0 || kcat < 0)
3844 break;
3845 }
3846 if (acat == kcat) {
3847 found = 1;
3848 break;
3849 }
6d3dc07c 3850 }
f7112e6c
CS		 3851 rcu_read_unlock();
3852
3853 if (found)
2f823ff8 3854 return skp;
f7112e6c 3855
54e70ec5 3856 if (ssp != NULL && ssp->smk_in == &smack_known_star)
2f823ff8
CS		 3857 return &smack_known_web;
3858 return &smack_known_star;
e114e473 3859 }
6d3dc07c
CS		 3860 if ((sap->flags & NETLBL_SECATTR_SECID) != 0) {
3861 /*
3862 * Looks like a fallback, which gives us a secid.
3863 */
2f823ff8 3864 skp = smack_from_secid(sap->attr.secid);
6d3dc07c
CS		 3865 /*
3866 * This has got to be a bug because it is
3867 * impossible to specify a fallback without
3868 * specifying the label, which will ensure
3869 * it has a secid, and the only way to get a
3870 * secid is from a fallback.
3871 */
2f823ff8
CS		 3872 BUG_ON(skp == NULL);
3873 return skp;
e114e473
CS		 3874 }
3875 /*
6d3dc07c
CS		 3876 * Without guidance regarding the smack value
3877 * for the packet fall back on the network
3878 * ambient value.
e114e473 3879 */
272cd7a8 3880 return smack_net_ambient;
e114e473
CS		 3881}
3882
69f287ae 3883#if IS_ENABLED(CONFIG_IPV6)
6ea06247 3884static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr_in6 *sip)
c6739443 3885{
c6739443
CS		 3886 u8 nexthdr;
3887 int offset;
3888 int proto = -EINVAL;
3889 struct ipv6hdr _ipv6h;
3890 struct ipv6hdr *ip6;
3891 __be16 frag_off;
3892 struct tcphdr _tcph, *th;
3893 struct udphdr _udph, *uh;
3894 struct dccp_hdr _dccph, *dh;
3895
3896 sip->sin6_port = 0;
3897
3898 offset = skb_network_offset(skb);
3899 ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h);
3900 if (ip6 == NULL)
3901 return -EINVAL;
3902 sip->sin6_addr = ip6->saddr;
3903
3904 nexthdr = ip6->nexthdr;
3905 offset += sizeof(_ipv6h);
3906 offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
3907 if (offset < 0)
3908 return -EINVAL;
3909
3910 proto = nexthdr;
3911 switch (proto) {
3912 case IPPROTO_TCP:
3913 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
3914 if (th != NULL)
3915 sip->sin6_port = th->source;
3916 break;
3917 case IPPROTO_UDP:
3918 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
3919 if (uh != NULL)
3920 sip->sin6_port = uh->source;
3921 break;
3922 case IPPROTO_DCCP:
3923 dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
3924 if (dh != NULL)
3925 sip->sin6_port = dh->dccph_sport;
3926 break;
3927 }
3928 return proto;
3929}
69f287ae 3930#endif /* CONFIG_IPV6 */
c6739443 3931
e114e473
CS		 3932/**
3933 * smack_socket_sock_rcv_skb - Smack packet delivery access check
3934 * @sk: socket
3935 * @skb: packet
3936 *
3937 * Returns 0 if the packet should be delivered, an error code otherwise
3938 */
3939static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
3940{
3941 struct netlbl_lsm_secattr secattr;
3942 struct socket_smack *ssp = sk->sk_security;
69f287ae 3943 struct smack_known *skp = NULL;
c6739443 3944 int rc = 0;
ecfcc53f 3945 struct smk_audit_info ad;
923e9a13 3946#ifdef CONFIG_AUDIT
48c62af6 3947 struct lsm_network_audit net;
923e9a13 3948#endif
69f287ae
CS		 3949#if IS_ENABLED(CONFIG_IPV6)
3950 struct sockaddr_in6 sadd;
3951 int proto;
3952#endif /* CONFIG_IPV6 */
3953
c6739443
CS		 3954 switch (sk->sk_family) {
3955 case PF_INET:
69f287ae
CS		 3956#ifdef CONFIG_SECURITY_SMACK_NETFILTER
3957 /*
3958 * If there is a secmark use it rather than the CIPSO label.
3959 * If there is no secmark fall back to CIPSO.
3960 * The secmark is assumed to reflect policy better.
3961 */
3962 if (skb && skb->secmark != 0) {
3963 skp = smack_from_secid(skb->secmark);
3964 goto access_check;
3965 }
3966#endif /* CONFIG_SECURITY_SMACK_NETFILTER */
c6739443
CS		 3967 /*
3968 * Translate what netlabel gave us.
3969 */
3970 netlbl_secattr_init(&secattr);
6d3dc07c 3971
c6739443
CS		 3972 rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr);
3973 if (rc == 0)
2f823ff8 3974 skp = smack_from_secattr(&secattr, ssp);
c6739443 3975 else
2f823ff8 3976 skp = smack_net_ambient;
6d3dc07c 3977
c6739443 3978 netlbl_secattr_destroy(&secattr);
6d3dc07c 3979
69f287ae
CS		 3980#ifdef CONFIG_SECURITY_SMACK_NETFILTER
3981access_check:
3982#endif
ecfcc53f 3983#ifdef CONFIG_AUDIT
c6739443
CS		 3984 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3985 ad.a.u.net->family = sk->sk_family;
3986 ad.a.u.net->netif = skb->skb_iif;
3987 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
ecfcc53f 3988#endif
c6739443
CS		 3989 /*
3990 * Receiving a packet requires that the other end
3991 * be able to write here. Read access is not required.
3992 * This is the simplist possible security model
3993 * for networking.
3994 */
21c7eae2
LP		 3995 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
3996 rc = smk_bu_note("IPv4 delivery", skp, ssp->smk_in,
d166c802 3997 MAY_WRITE, rc);
c6739443
CS		 3998 if (rc != 0)
3999 netlbl_skbuff_err(skb, rc, 0);
4000 break;
69f287ae 4001#if IS_ENABLED(CONFIG_IPV6)
c6739443 4002 case PF_INET6:
69f287ae
CS		 4003 proto = smk_skb_to_addr_ipv6(skb, &sadd);
4004 if (proto != IPPROTO_UDP && proto != IPPROTO_TCP)
4005 break;
21abb1ec 4006#ifdef SMACK_IPV6_SECMARK_LABELING
69f287ae
CS		 4007 if (skb && skb->secmark != 0)
4008 skp = smack_from_secid(skb->secmark);
c6739443 4009 else
21abb1ec
CS		 4010 skp = smack_ipv6host_label(&sadd);
4011 if (skp == NULL)
69f287ae
CS		 4012 skp = smack_net_ambient;
4013#ifdef CONFIG_AUDIT
4014 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
4015 ad.a.u.net->family = sk->sk_family;
4016 ad.a.u.net->netif = skb->skb_iif;
4017 ipv6_skb_to_auditdata(skb, &ad.a, NULL);
4018#endif /* CONFIG_AUDIT */
4019 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
4020 rc = smk_bu_note("IPv6 delivery", skp, ssp->smk_in,
4021 MAY_WRITE, rc);
21abb1ec
CS		 4022#endif /* SMACK_IPV6_SECMARK_LABELING */
4023#ifdef SMACK_IPV6_PORT_LABELING
69f287ae 4024 rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING);
21abb1ec 4025#endif /* SMACK_IPV6_PORT_LABELING */
c6739443 4026 break;
69f287ae 4027#endif /* CONFIG_IPV6 */
c6739443 4028 }
69f287ae 4029
a8134296 4030 return rc;
e114e473
CS		 4031}
4032
4033/**
4034 * smack_socket_getpeersec_stream - pull in packet label
4035 * @sock: the socket
4036 * @optval: user's destination
4037 * @optlen: size thereof
251a2a95 4038 * @len: max thereof
e114e473
CS		 4039 *
4040 * returns zero on success, an error code otherwise
4041 */
4042static int smack_socket_getpeersec_stream(struct socket *sock,
4043 char __user *optval,
4044 int __user *optlen, unsigned len)
4045{
4046 struct socket_smack *ssp;
272cd7a8
CS		 4047 char *rcp = "";
4048 int slen = 1;
e114e473
CS		 4049 int rc = 0;
4050
4051 ssp = sock->sk->sk_security;
272cd7a8 4052 if (ssp->smk_packet != NULL) {
54e70ec5 4053 rcp = ssp->smk_packet->smk_known;
272cd7a8
CS		 4054 slen = strlen(rcp) + 1;
4055 }
e114e473
CS		 4056
4057 if (slen > len)
4058 rc = -ERANGE;
272cd7a8 4059 else if (copy_to_user(optval, rcp, slen) != 0)
e114e473
CS		 4060 rc = -EFAULT;
4061
4062 if (put_user(slen, optlen) != 0)
4063 rc = -EFAULT;
4064
4065 return rc;
4066}
4067
4068
4069/**
4070 * smack_socket_getpeersec_dgram - pull in packet label
b4e0d5f0 4071 * @sock: the peer socket
e114e473
CS		 4072 * @skb: packet data
4073 * @secid: pointer to where to put the secid of the packet
4074 *
4075 * Sets the netlabel socket state on sk from parent
4076 */
4077static int smack_socket_getpeersec_dgram(struct socket *sock,
4078 struct sk_buff *skb, u32 *secid)
4079
4080{
4081 struct netlbl_lsm_secattr secattr;
272cd7a8 4082 struct socket_smack *ssp = NULL;
2f823ff8 4083 struct smack_known *skp;
b4e0d5f0
CS		 4084 int family = PF_UNSPEC;
4085 u32 s = 0; /* 0 is the invalid secid */
e114e473
CS		 4086 int rc;
4087
b4e0d5f0
CS		 4088 if (skb != NULL) {
4089 if (skb->protocol == htons(ETH_P_IP))
4090 family = PF_INET;
69f287ae 4091#if IS_ENABLED(CONFIG_IPV6)
b4e0d5f0
CS		 4092 else if (skb->protocol == htons(ETH_P_IPV6))
4093 family = PF_INET6;
69f287ae 4094#endif /* CONFIG_IPV6 */
e114e473 4095 }
b4e0d5f0
CS		 4096 if (family == PF_UNSPEC && sock != NULL)
4097 family = sock->sk->sk_family;
e114e473 4098
69f287ae
CS		 4099 switch (family) {
4100 case PF_UNIX:
272cd7a8 4101 ssp = sock->sk->sk_security;
2f823ff8 4102 s = ssp->smk_out->smk_secid;
69f287ae
CS		 4103 break;
4104 case PF_INET:
4105#ifdef CONFIG_SECURITY_SMACK_NETFILTER
4106 s = skb->secmark;
4107 if (s != 0)
4108 break;
4109#endif
b4e0d5f0
CS		 4110 /*
4111 * Translate what netlabel gave us.
4112 */
272cd7a8
CS		 4113 if (sock != NULL && sock->sk != NULL)
4114 ssp = sock->sk->sk_security;
b4e0d5f0
CS		 4115 netlbl_secattr_init(&secattr);
4116 rc = netlbl_skbuff_getattr(skb, family, &secattr);
4117 if (rc == 0) {
2f823ff8
CS		 4118 skp = smack_from_secattr(&secattr, ssp);
4119 s = skp->smk_secid;
b4e0d5f0
CS		 4120 }
4121 netlbl_secattr_destroy(&secattr);
69f287ae 4122 break;
69f287ae 4123 case PF_INET6:
21abb1ec 4124#ifdef SMACK_IPV6_SECMARK_LABELING
69f287ae 4125 s = skb->secmark;
21abb1ec 4126#endif
69f287ae 4127 break;
b4e0d5f0
CS		 4128 }
4129 *secid = s;
e114e473
CS		 4130 if (s == 0)
4131 return -EINVAL;
e114e473
CS		 4132 return 0;
4133}
4134
4135/**
07feee8f
PM		 4136 * smack_sock_graft - Initialize a newly created socket with an existing sock
4137 * @sk: child sock
4138 * @parent: parent socket
e114e473 4139 *
07feee8f
PM		 4140 * Set the smk_{in,out} state of an existing sock based on the process that
4141 * is creating the new socket.
e114e473
CS		 4142 */
4143static void smack_sock_graft(struct sock *sk, struct socket *parent)
4144{
4145 struct socket_smack *ssp;
2f823ff8 4146 struct smack_known *skp = smk_of_current();
e114e473 4147
07feee8f
PM		 4148 if (sk == NULL ||
4149 (sk->sk_family != PF_INET && sk->sk_family != PF_INET6))
e114e473
CS		 4150 return;
4151
4152 ssp = sk->sk_security;
54e70ec5 4153 ssp->smk_in = skp;
2f823ff8 4154 ssp->smk_out = skp;
07feee8f 4155 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
e114e473
CS		 4156}
4157
4158/**
4159 * smack_inet_conn_request - Smack access check on connect
4160 * @sk: socket involved
4161 * @skb: packet
4162 * @req: unused
4163 *
4164 * Returns 0 if a task with the packet label could write to
4165 * the socket, otherwise an error code
4166 */
4167static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
4168 struct request_sock *req)
4169{
07feee8f 4170 u16 family = sk->sk_family;
f7112e6c 4171 struct smack_known *skp;
e114e473 4172 struct socket_smack *ssp = sk->sk_security;
07feee8f
PM		 4173 struct netlbl_lsm_secattr secattr;
4174 struct sockaddr_in addr;
4175 struct iphdr *hdr;
21c7eae2 4176 struct smack_known *hskp;
e114e473 4177 int rc;
ecfcc53f 4178 struct smk_audit_info ad;
923e9a13 4179#ifdef CONFIG_AUDIT
48c62af6 4180 struct lsm_network_audit net;
923e9a13 4181#endif
e114e473 4182
69f287ae 4183#if IS_ENABLED(CONFIG_IPV6)
c6739443
CS		 4184 if (family == PF_INET6) {
4185 /*
4186 * Handle mapped IPv4 packets arriving
4187 * via IPv6 sockets. Don't set up netlabel
4188 * processing on IPv6.
4189 */
4190 if (skb->protocol == htons(ETH_P_IP))
4191 family = PF_INET;
4192 else
4193 return 0;
4194 }
69f287ae 4195#endif /* CONFIG_IPV6 */
e114e473 4196
7f368ad3
CS		 4197#ifdef CONFIG_SECURITY_SMACK_NETFILTER
4198 /*
4199 * If there is a secmark use it rather than the CIPSO label.
4200 * If there is no secmark fall back to CIPSO.
4201 * The secmark is assumed to reflect policy better.
4202 */
4203 if (skb && skb->secmark != 0) {
4204 skp = smack_from_secid(skb->secmark);
4205 goto access_check;
4206 }
4207#endif /* CONFIG_SECURITY_SMACK_NETFILTER */
4208
07feee8f
PM		 4209 netlbl_secattr_init(&secattr);
4210 rc = netlbl_skbuff_getattr(skb, family, &secattr);
e114e473 4211 if (rc == 0)
2f823ff8 4212 skp = smack_from_secattr(&secattr, ssp);
e114e473 4213 else
2f823ff8 4214 skp = &smack_known_huh;
07feee8f
PM		 4215 netlbl_secattr_destroy(&secattr);
4216
7f368ad3
CS		 4217#ifdef CONFIG_SECURITY_SMACK_NETFILTER
4218access_check:
4219#endif
4220
ecfcc53f 4221#ifdef CONFIG_AUDIT
48c62af6
EP		 4222 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
4223 ad.a.u.net->family = family;
4224 ad.a.u.net->netif = skb->skb_iif;
ecfcc53f
EB		 4225 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
4226#endif
e114e473 4227 /*
07feee8f
PM		 4228 * Receiving a packet requires that the other end be able to write
4229 * here. Read access is not required.
e114e473 4230 */
21c7eae2
LP		 4231 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
4232 rc = smk_bu_note("IPv4 connect", skp, ssp->smk_in, MAY_WRITE, rc);
07feee8f
PM		 4233 if (rc != 0)
4234 return rc;
4235
4236 /*
4237 * Save the peer's label in the request_sock so we can later setup
4238 * smk_packet in the child socket so that SO_PEERCRED can report it.
4239 */
2f823ff8 4240 req->peer_secid = skp->smk_secid;
07feee8f
PM		 4241
4242 /*
4243 * We need to decide if we want to label the incoming connection here
4244 * if we do we only need to label the request_sock and the stack will
25985edc 4245 * propagate the wire-label to the sock when it is created.
07feee8f
PM		 4246 */
4247 hdr = ip_hdr(skb);
4248 addr.sin_addr.s_addr = hdr->saddr;
4249 rcu_read_lock();
21abb1ec 4250 hskp = smack_ipv4host_label(&addr);
f7112e6c
CS		 4251 rcu_read_unlock();
4252
21c7eae2 4253 if (hskp == NULL)
f7112e6c 4254 rc = netlbl_req_setattr(req, &skp->smk_netlabel);
2f823ff8 4255 else
07feee8f 4256 netlbl_req_delattr(req);
e114e473
CS		 4257
4258 return rc;
4259}
4260
07feee8f
PM		 4261/**
4262 * smack_inet_csk_clone - Copy the connection information to the new socket
4263 * @sk: the new socket
4264 * @req: the connection's request_sock
4265 *
4266 * Transfer the connection's peer label to the newly created socket.
4267 */
4268static void smack_inet_csk_clone(struct sock *sk,
4269 const struct request_sock *req)
4270{
4271 struct socket_smack *ssp = sk->sk_security;
2f823ff8 4272 struct smack_known *skp;
07feee8f 4273
2f823ff8
CS		 4274 if (req->peer_secid != 0) {
4275 skp = smack_from_secid(req->peer_secid);
54e70ec5 4276 ssp->smk_packet = skp;
2f823ff8 4277 } else
272cd7a8 4278 ssp->smk_packet = NULL;
07feee8f
PM		 4279}
4280
e114e473
CS		 4281/*
4282 * Key management security hooks
4283 *
4284 * Casey has not tested key support very heavily.
4285 * The permission check is most likely too restrictive.
4286 * If you care about keys please have a look.
4287 */
4288#ifdef CONFIG_KEYS
4289
4290/**
4291 * smack_key_alloc - Set the key security blob
4292 * @key: object
d84f4f99 4293 * @cred: the credentials to use
e114e473
CS		 4294 * @flags: unused
4295 *
4296 * No allocation required
4297 *
4298 * Returns 0
4299 */
d84f4f99 4300static int smack_key_alloc(struct key *key, const struct cred *cred,
e114e473
CS		 4301 unsigned long flags)
4302{
2f823ff8
CS		 4303 struct smack_known *skp = smk_of_task(cred->security);
4304
21c7eae2 4305 key->security = skp;
e114e473
CS		 4306 return 0;
4307}
4308
4309/**
4310 * smack_key_free - Clear the key security blob
4311 * @key: the object
4312 *
4313 * Clear the blob pointer
4314 */
4315static void smack_key_free(struct key *key)
4316{
4317 key->security = NULL;
4318}
4319
1a28979b 4320/**
e114e473
CS		 4321 * smack_key_permission - Smack access on a key
4322 * @key_ref: gets to the object
d84f4f99 4323 * @cred: the credentials to use
1a28979b 4324 * @perm: requested key permissions
e114e473
CS		 4325 *
4326 * Return 0 if the task has read and write to the object,
4327 * an error code otherwise
4328 */
4329static int smack_key_permission(key_ref_t key_ref,
f5895943 4330 const struct cred *cred, unsigned perm)
e114e473
CS		 4331{
4332 struct key *keyp;
ecfcc53f 4333 struct smk_audit_info ad;
2f823ff8 4334 struct smack_known *tkp = smk_of_task(cred->security);
fffea214 4335 int request = 0;
d166c802 4336 int rc;
e114e473
CS		 4337
4338 keyp = key_ref_to_ptr(key_ref);
4339 if (keyp == NULL)
4340 return -EINVAL;
4341 /*
4342 * If the key hasn't been initialized give it access so that
4343 * it may do so.
4344 */
4345 if (keyp->security == NULL)
4346 return 0;
4347 /*
4348 * This should not occur
4349 */
2f823ff8 4350 if (tkp == NULL)
e114e473 4351 return -EACCES;
ecfcc53f
EB		 4352#ifdef CONFIG_AUDIT
4353 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY);
4354 ad.a.u.key_struct.key = keyp->serial;
4355 ad.a.u.key_struct.key_desc = keyp->description;
4356#endif
fffea214
DK		 4357 if (perm & KEY_NEED_READ)
4358 request = MAY_READ;
4359 if (perm & (KEY_NEED_WRITE | KEY_NEED_LINK | KEY_NEED_SETATTR))
4360 request = MAY_WRITE;
d166c802
CS		 4361 rc = smk_access(tkp, keyp->security, request, &ad);
4362 rc = smk_bu_note("key access", tkp, keyp->security, request, rc);
4363 return rc;
e114e473 4364}
7fc5f36e
JB		 4365
4366/*
4367 * smack_key_getsecurity - Smack label tagging the key
4368 * @key points to the key to be queried
4369 * @_buffer points to a pointer that should be set to point to the
4370 * resulting string (if no label or an error occurs).
4371 * Return the length of the string (including terminating NUL) or -ve if
4372 * an error.
4373 * May also return 0 (and a NULL buffer pointer) if there is no label.
4374 */
4375static int smack_key_getsecurity(struct key *key, char **_buffer)
4376{
4377 struct smack_known *skp = key->security;
4378 size_t length;
4379 char *copy;
4380
4381 if (key->security == NULL) {
4382 *_buffer = NULL;
4383 return 0;
4384 }
4385
4386 copy = kstrdup(skp->smk_known, GFP_KERNEL);
4387 if (copy == NULL)
4388 return -ENOMEM;
4389 length = strlen(copy) + 1;
4390
4391 *_buffer = copy;
4392 return length;
4393}
4394
e114e473
CS		 4395#endif /* CONFIG_KEYS */
4396
d20bdda6
AD		 4397/*
4398 * Smack Audit hooks
4399 *
4400 * Audit requires a unique representation of each Smack specific
4401 * rule. This unique representation is used to distinguish the
4402 * object to be audited from remaining kernel objects and also
4403 * works as a glue between the audit hooks.
4404 *
4405 * Since repository entries are added but never deleted, we'll use
4406 * the smack_known label address related to the given audit rule as
4407 * the needed unique representation. This also better fits the smack
4408 * model where nearly everything is a label.
4409 */
4410#ifdef CONFIG_AUDIT
4411
4412/**
4413 * smack_audit_rule_init - Initialize a smack audit rule
4414 * @field: audit rule fields given from user-space (audit.h)
4415 * @op: required testing operator (=, !=, >, <, ...)
4416 * @rulestr: smack label to be audited
4417 * @vrule: pointer to save our own audit rule representation
4418 *
4419 * Prepare to audit cases where (@field @op @rulestr) is true.
4420 * The label to be audited is created if necessay.
4421 */
4422static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
4423{
21c7eae2 4424 struct smack_known *skp;
d20bdda6
AD		 4425 char **rule = (char **)vrule;
4426 *rule = NULL;
4427
4428 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
4429 return -EINVAL;
4430
5af75d8d 4431 if (op != Audit_equal && op != Audit_not_equal)
d20bdda6
AD		 4432 return -EINVAL;
4433
21c7eae2 4434 skp = smk_import_entry(rulestr, 0);
e774ad68
LP		 4435 if (IS_ERR(skp))
4436 return PTR_ERR(skp);
4437
4438 *rule = skp->smk_known;
d20bdda6
AD		 4439
4440 return 0;
4441}
4442
4443/**
4444 * smack_audit_rule_known - Distinguish Smack audit rules
4445 * @krule: rule of interest, in Audit kernel representation format
4446 *
4447 * This is used to filter Smack rules from remaining Audit ones.
4448 * If it's proved that this rule belongs to us, the
4449 * audit_rule_match hook will be called to do the final judgement.
4450 */
4451static int smack_audit_rule_known(struct audit_krule *krule)
4452{
4453 struct audit_field *f;
4454 int i;
4455
4456 for (i = 0; i < krule->field_count; i++) {
4457 f = &krule->fields[i];
4458
4459 if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER)
4460 return 1;
4461 }
4462
4463 return 0;
4464}
4465
4466/**
4467 * smack_audit_rule_match - Audit given object ?
4468 * @secid: security id for identifying the object to test
4469 * @field: audit rule flags given from user-space
4470 * @op: required testing operator
4471 * @vrule: smack internal rule presentation
4472 * @actx: audit context associated with the check
4473 *
4474 * The core Audit hook. It's used to take the decision of
4475 * whether to audit or not to audit a given object.
4476 */
4477static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule,
4478 struct audit_context *actx)
4479{
2f823ff8 4480 struct smack_known *skp;
d20bdda6
AD		 4481 char *rule = vrule;
4482
4eb0f4ab
RGB		 4483 if (unlikely(!rule)) {
4484 WARN_ONCE(1, "Smack: missing rule\n");
d20bdda6
AD		 4485 return -ENOENT;
4486 }
4487
4488 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
4489 return 0;
4490
2f823ff8 4491 skp = smack_from_secid(secid);
d20bdda6
AD		 4492
4493 /*
4494 * No need to do string comparisons. If a match occurs,
4495 * both pointers will point to the same smack_known
4496 * label.
4497 */
5af75d8d 4498 if (op == Audit_equal)
2f823ff8 4499 return (rule == skp->smk_known);
5af75d8d 4500 if (op == Audit_not_equal)
2f823ff8 4501 return (rule != skp->smk_known);
d20bdda6
AD		 4502
4503 return 0;
4504}
4505
4506/**
4507 * smack_audit_rule_free - free smack rule representation
4508 * @vrule: rule to be freed.
4509 *
4510 * No memory was allocated.
4511 */
4512static void smack_audit_rule_free(void *vrule)
4513{
4514 /* No-op */
4515}
4516
4517#endif /* CONFIG_AUDIT */
4518
746df9b5
DQ		 4519/**
4520 * smack_ismaclabel - check if xattr @name references a smack MAC label
4521 * @name: Full xattr name to check.
4522 */
4523static int smack_ismaclabel(const char *name)
4524{
4525 return (strcmp(name, XATTR_SMACK_SUFFIX) == 0);
4526}
4527
4528
251a2a95 4529/**
e114e473
CS		 4530 * smack_secid_to_secctx - return the smack label for a secid
4531 * @secid: incoming integer
4532 * @secdata: destination
4533 * @seclen: how long it is
4534 *
4535 * Exists for networking code.
4536 */
4537static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
4538{
2f823ff8 4539 struct smack_known *skp = smack_from_secid(secid);
e114e473 4540
d5630b9d 4541 if (secdata)
2f823ff8
CS		 4542 *secdata = skp->smk_known;
4543 *seclen = strlen(skp->smk_known);
e114e473
CS		 4544 return 0;
4545}
4546
251a2a95 4547/**
4bc87e62
CS		 4548 * smack_secctx_to_secid - return the secid for a smack label
4549 * @secdata: smack label
4550 * @seclen: how long result is
4551 * @secid: outgoing integer
4552 *
4553 * Exists for audit and networking code.
4554 */
e52c1764 4555static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
4bc87e62 4556{
21c7eae2
LP		 4557 struct smack_known *skp = smk_find_entry(secdata);
4558
4559 if (skp)
4560 *secid = skp->smk_secid;
4561 else
4562 *secid = 0;
4bc87e62
CS		 4563 return 0;
4564}
4565
251a2a95 4566/**
e114e473 4567 * smack_release_secctx - don't do anything.
251a2a95
RD		 4568 * @secdata: unused
4569 * @seclen: unused
e114e473
CS		 4570 *
4571 * Exists to make sure nothing gets done, and properly
4572 */
4573static void smack_release_secctx(char *secdata, u32 seclen)
4574{
4575}
4576
1ee65e37
DQ		 4577static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
4578{
4579 return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0);
4580}
4581
4582static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
4583{
4584 return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0);
4585}
4586
4587static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
4588{
4589 int len = 0;
4590 len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true);
4591
4592 if (len < 0)
4593 return len;
4594 *ctxlen = len;
4595 return 0;
4596}
4597
1eddfe8e 4598static struct security_hook_list smack_hooks[] = {
e20b043a
CS		 4599 LSM_HOOK_INIT(ptrace_access_check, smack_ptrace_access_check),
4600 LSM_HOOK_INIT(ptrace_traceme, smack_ptrace_traceme),
4601 LSM_HOOK_INIT(syslog, smack_syslog),
4602
4603 LSM_HOOK_INIT(sb_alloc_security, smack_sb_alloc_security),
4604 LSM_HOOK_INIT(sb_free_security, smack_sb_free_security),
4605 LSM_HOOK_INIT(sb_copy_data, smack_sb_copy_data),
4606 LSM_HOOK_INIT(sb_kern_mount, smack_sb_kern_mount),
4607 LSM_HOOK_INIT(sb_statfs, smack_sb_statfs),
3bf2789c
VT		 4608 LSM_HOOK_INIT(sb_set_mnt_opts, smack_set_mnt_opts),
4609 LSM_HOOK_INIT(sb_parse_opts_str, smack_parse_opts_str),
e20b043a
CS		 4610
4611 LSM_HOOK_INIT(bprm_set_creds, smack_bprm_set_creds),
4612 LSM_HOOK_INIT(bprm_committing_creds, smack_bprm_committing_creds),
4613 LSM_HOOK_INIT(bprm_secureexec, smack_bprm_secureexec),
4614
4615 LSM_HOOK_INIT(inode_alloc_security, smack_inode_alloc_security),
4616 LSM_HOOK_INIT(inode_free_security, smack_inode_free_security),
4617 LSM_HOOK_INIT(inode_init_security, smack_inode_init_security),
4618 LSM_HOOK_INIT(inode_link, smack_inode_link),
4619 LSM_HOOK_INIT(inode_unlink, smack_inode_unlink),
4620 LSM_HOOK_INIT(inode_rmdir, smack_inode_rmdir),
4621 LSM_HOOK_INIT(inode_rename, smack_inode_rename),
4622 LSM_HOOK_INIT(inode_permission, smack_inode_permission),
4623 LSM_HOOK_INIT(inode_setattr, smack_inode_setattr),
4624 LSM_HOOK_INIT(inode_getattr, smack_inode_getattr),
4625 LSM_HOOK_INIT(inode_setxattr, smack_inode_setxattr),
4626 LSM_HOOK_INIT(inode_post_setxattr, smack_inode_post_setxattr),
4627 LSM_HOOK_INIT(inode_getxattr, smack_inode_getxattr),
4628 LSM_HOOK_INIT(inode_removexattr, smack_inode_removexattr),
4629 LSM_HOOK_INIT(inode_getsecurity, smack_inode_getsecurity),
4630 LSM_HOOK_INIT(inode_setsecurity, smack_inode_setsecurity),
4631 LSM_HOOK_INIT(inode_listsecurity, smack_inode_listsecurity),
4632 LSM_HOOK_INIT(inode_getsecid, smack_inode_getsecid),
4633
4634 LSM_HOOK_INIT(file_permission, smack_file_permission),
4635 LSM_HOOK_INIT(file_alloc_security, smack_file_alloc_security),
4636 LSM_HOOK_INIT(file_free_security, smack_file_free_security),
4637 LSM_HOOK_INIT(file_ioctl, smack_file_ioctl),
4638 LSM_HOOK_INIT(file_lock, smack_file_lock),
4639 LSM_HOOK_INIT(file_fcntl, smack_file_fcntl),
4640 LSM_HOOK_INIT(mmap_file, smack_mmap_file),
4641 LSM_HOOK_INIT(mmap_addr, cap_mmap_addr),
4642 LSM_HOOK_INIT(file_set_fowner, smack_file_set_fowner),
4643 LSM_HOOK_INIT(file_send_sigiotask, smack_file_send_sigiotask),
4644 LSM_HOOK_INIT(file_receive, smack_file_receive),
4645
4646 LSM_HOOK_INIT(file_open, smack_file_open),
4647
4648 LSM_HOOK_INIT(cred_alloc_blank, smack_cred_alloc_blank),
4649 LSM_HOOK_INIT(cred_free, smack_cred_free),
4650 LSM_HOOK_INIT(cred_prepare, smack_cred_prepare),
4651 LSM_HOOK_INIT(cred_transfer, smack_cred_transfer),
4652 LSM_HOOK_INIT(kernel_act_as, smack_kernel_act_as),
4653 LSM_HOOK_INIT(kernel_create_files_as, smack_kernel_create_files_as),
4654 LSM_HOOK_INIT(task_setpgid, smack_task_setpgid),
4655 LSM_HOOK_INIT(task_getpgid, smack_task_getpgid),
4656 LSM_HOOK_INIT(task_getsid, smack_task_getsid),
4657 LSM_HOOK_INIT(task_getsecid, smack_task_getsecid),
4658 LSM_HOOK_INIT(task_setnice, smack_task_setnice),
4659 LSM_HOOK_INIT(task_setioprio, smack_task_setioprio),
4660 LSM_HOOK_INIT(task_getioprio, smack_task_getioprio),
4661 LSM_HOOK_INIT(task_setscheduler, smack_task_setscheduler),
4662 LSM_HOOK_INIT(task_getscheduler, smack_task_getscheduler),
4663 LSM_HOOK_INIT(task_movememory, smack_task_movememory),
4664 LSM_HOOK_INIT(task_kill, smack_task_kill),
4665 LSM_HOOK_INIT(task_wait, smack_task_wait),
4666 LSM_HOOK_INIT(task_to_inode, smack_task_to_inode),
4667
4668 LSM_HOOK_INIT(ipc_permission, smack_ipc_permission),
4669 LSM_HOOK_INIT(ipc_getsecid, smack_ipc_getsecid),
4670
4671 LSM_HOOK_INIT(msg_msg_alloc_security, smack_msg_msg_alloc_security),
4672 LSM_HOOK_INIT(msg_msg_free_security, smack_msg_msg_free_security),
4673
4674 LSM_HOOK_INIT(msg_queue_alloc_security, smack_msg_queue_alloc_security),
4675 LSM_HOOK_INIT(msg_queue_free_security, smack_msg_queue_free_security),
4676 LSM_HOOK_INIT(msg_queue_associate, smack_msg_queue_associate),
4677 LSM_HOOK_INIT(msg_queue_msgctl, smack_msg_queue_msgctl),
4678 LSM_HOOK_INIT(msg_queue_msgsnd, smack_msg_queue_msgsnd),
4679 LSM_HOOK_INIT(msg_queue_msgrcv, smack_msg_queue_msgrcv),
4680
4681 LSM_HOOK_INIT(shm_alloc_security, smack_shm_alloc_security),
4682 LSM_HOOK_INIT(shm_free_security, smack_shm_free_security),
4683 LSM_HOOK_INIT(shm_associate, smack_shm_associate),
4684 LSM_HOOK_INIT(shm_shmctl, smack_shm_shmctl),
4685 LSM_HOOK_INIT(shm_shmat, smack_shm_shmat),
4686
4687 LSM_HOOK_INIT(sem_alloc_security, smack_sem_alloc_security),
4688 LSM_HOOK_INIT(sem_free_security, smack_sem_free_security),
4689 LSM_HOOK_INIT(sem_associate, smack_sem_associate),
4690 LSM_HOOK_INIT(sem_semctl, smack_sem_semctl),
4691 LSM_HOOK_INIT(sem_semop, smack_sem_semop),
4692
4693 LSM_HOOK_INIT(d_instantiate, smack_d_instantiate),
4694
4695 LSM_HOOK_INIT(getprocattr, smack_getprocattr),
4696 LSM_HOOK_INIT(setprocattr, smack_setprocattr),
4697
4698 LSM_HOOK_INIT(unix_stream_connect, smack_unix_stream_connect),
4699 LSM_HOOK_INIT(unix_may_send, smack_unix_may_send),
4700
4701 LSM_HOOK_INIT(socket_post_create, smack_socket_post_create),
21abb1ec 4702#ifdef SMACK_IPV6_PORT_LABELING
e20b043a 4703 LSM_HOOK_INIT(socket_bind, smack_socket_bind),
21abb1ec 4704#endif
e20b043a
CS		 4705 LSM_HOOK_INIT(socket_connect, smack_socket_connect),
4706 LSM_HOOK_INIT(socket_sendmsg, smack_socket_sendmsg),
4707 LSM_HOOK_INIT(socket_sock_rcv_skb, smack_socket_sock_rcv_skb),
4708 LSM_HOOK_INIT(socket_getpeersec_stream, smack_socket_getpeersec_stream),
4709 LSM_HOOK_INIT(socket_getpeersec_dgram, smack_socket_getpeersec_dgram),
4710 LSM_HOOK_INIT(sk_alloc_security, smack_sk_alloc_security),
4711 LSM_HOOK_INIT(sk_free_security, smack_sk_free_security),
4712 LSM_HOOK_INIT(sock_graft, smack_sock_graft),
4713 LSM_HOOK_INIT(inet_conn_request, smack_inet_conn_request),
4714 LSM_HOOK_INIT(inet_csk_clone, smack_inet_csk_clone),
d20bdda6 4715
e114e473
CS		 4716 /* key management security hooks */
4717#ifdef CONFIG_KEYS
e20b043a
CS		 4718 LSM_HOOK_INIT(key_alloc, smack_key_alloc),
4719 LSM_HOOK_INIT(key_free, smack_key_free),
4720 LSM_HOOK_INIT(key_permission, smack_key_permission),
4721 LSM_HOOK_INIT(key_getsecurity, smack_key_getsecurity),
e114e473 4722#endif /* CONFIG_KEYS */
d20bdda6
AD		 4723
4724 /* Audit hooks */
4725#ifdef CONFIG_AUDIT
e20b043a
CS		 4726 LSM_HOOK_INIT(audit_rule_init, smack_audit_rule_init),
4727 LSM_HOOK_INIT(audit_rule_known, smack_audit_rule_known),
4728 LSM_HOOK_INIT(audit_rule_match, smack_audit_rule_match),
4729 LSM_HOOK_INIT(audit_rule_free, smack_audit_rule_free),
d20bdda6
AD		 4730#endif /* CONFIG_AUDIT */
4731
e20b043a
CS		 4732 LSM_HOOK_INIT(ismaclabel, smack_ismaclabel),
4733 LSM_HOOK_INIT(secid_to_secctx, smack_secid_to_secctx),
4734 LSM_HOOK_INIT(secctx_to_secid, smack_secctx_to_secid),
4735 LSM_HOOK_INIT(release_secctx, smack_release_secctx),
4736 LSM_HOOK_INIT(inode_notifysecctx, smack_inode_notifysecctx),
4737 LSM_HOOK_INIT(inode_setsecctx, smack_inode_setsecctx),
4738 LSM_HOOK_INIT(inode_getsecctx, smack_inode_getsecctx),
e114e473
CS		 4739};
4740
7198e2ee 4741
86812bb0 4742static __init void init_smack_known_list(void)
7198e2ee 4743{
86812bb0
CS		 4744 /*
4745 * Initialize rule list locks
4746 */
4747 mutex_init(&smack_known_huh.smk_rules_lock);
4748 mutex_init(&smack_known_hat.smk_rules_lock);
4749 mutex_init(&smack_known_floor.smk_rules_lock);
4750 mutex_init(&smack_known_star.smk_rules_lock);
4751 mutex_init(&smack_known_invalid.smk_rules_lock);
4752 mutex_init(&smack_known_web.smk_rules_lock);
4753 /*
4754 * Initialize rule lists
4755 */
4756 INIT_LIST_HEAD(&smack_known_huh.smk_rules);
4757 INIT_LIST_HEAD(&smack_known_hat.smk_rules);
4758 INIT_LIST_HEAD(&smack_known_star.smk_rules);
4759 INIT_LIST_HEAD(&smack_known_floor.smk_rules);
4760 INIT_LIST_HEAD(&smack_known_invalid.smk_rules);
4761 INIT_LIST_HEAD(&smack_known_web.smk_rules);
4762 /*
4763 * Create the known labels list
4764 */
4d7cf4a1
TS		 4765 smk_insert_entry(&smack_known_huh);
4766 smk_insert_entry(&smack_known_hat);
4767 smk_insert_entry(&smack_known_star);
4768 smk_insert_entry(&smack_known_floor);
4769 smk_insert_entry(&smack_known_invalid);
4770 smk_insert_entry(&smack_known_web);
7198e2ee
EB		 4771}
4772
e114e473
CS		 4773/**
4774 * smack_init - initialize the smack system
4775 *
4776 * Returns 0
4777 */
4778static __init int smack_init(void)
4779{
d84f4f99 4780 struct cred *cred;
676dac4b 4781 struct task_smack *tsp;
d84f4f99 4782
b1d9e6b0 4783 if (!security_module_enable("smack"))
7898e1f8
CS		 4784 return 0;
4785
1a5b472b
R		 4786 smack_inode_cache = KMEM_CACHE(inode_smack, 0);
4787 if (!smack_inode_cache)
4788 return -ENOMEM;
4789
2f823ff8
CS		 4790 tsp = new_task_smack(&smack_known_floor, &smack_known_floor,
4791 GFP_KERNEL);
1a5b472b
R		 4792 if (tsp == NULL) {
4793 kmem_cache_destroy(smack_inode_cache);
676dac4b 4794 return -ENOMEM;
1a5b472b 4795 }
676dac4b 4796
d21b7b04
JB		 4797 smack_enabled = 1;
4798
21abb1ec
CS		 4799 pr_info("Smack: Initializing.\n");
4800#ifdef CONFIG_SECURITY_SMACK_NETFILTER
4801 pr_info("Smack: Netfilter enabled.\n");
4802#endif
4803#ifdef SMACK_IPV6_PORT_LABELING
4804 pr_info("Smack: IPv6 port labeling enabled.\n");
4805#endif
4806#ifdef SMACK_IPV6_SECMARK_LABELING
4807 pr_info("Smack: IPv6 Netfilter enabled.\n");
4808#endif
e114e473
CS		 4809
4810 /*
4811 * Set the security state for the initial task.
4812 */
d84f4f99 4813 cred = (struct cred *) current->cred;
676dac4b 4814 cred->security = tsp;
e114e473 4815
86812bb0
CS		 4816 /* initialize the smack_known_list */
4817 init_smack_known_list();
e114e473
CS		 4818
4819 /*
4820 * Register with LSM
4821 */
b1d9e6b0 4822 security_add_hooks(smack_hooks, ARRAY_SIZE(smack_hooks));
e114e473
CS		 4823
4824 return 0;
4825}
4826
4827/*
4828 * Smack requires early initialization in order to label
4829 * all processes and objects when they are created.
4830 */
4831security_initcall(smack_init);
Linux kernel - Deliverables
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