powerpc/eeh: Fix PE#0 check in eeh_add_to_parent_pe()
[linux/fpc-iii.git] / security / smack / smack_lsm.c
blobc934311812f1a777093c44a89543dcae924b8568
1 /*
2 * Simplified MAC Kernel (smack) security module
4 * This file contains the smack hook function implementations.
6 * Authors:
7 * Casey Schaufler <casey@schaufler-ca.com>
8 * Jarkko Sakkinen <jarkko.sakkinen@intel.com>
10 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
11 * Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
12 * Paul Moore <paul@paul-moore.com>
13 * Copyright (C) 2010 Nokia Corporation
14 * Copyright (C) 2011 Intel Corporation.
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.
21 #include <linux/xattr.h>
22 #include <linux/pagemap.h>
23 #include <linux/mount.h>
24 #include <linux/stat.h>
25 #include <linux/kd.h>
26 #include <asm/ioctls.h>
27 #include <linux/ip.h>
28 #include <linux/tcp.h>
29 #include <linux/udp.h>
30 #include <linux/dccp.h>
31 #include <linux/slab.h>
32 #include <linux/mutex.h>
33 #include <linux/pipe_fs_i.h>
34 #include <net/cipso_ipv4.h>
35 #include <net/ip.h>
36 #include <net/ipv6.h>
37 #include <linux/audit.h>
38 #include <linux/magic.h>
39 #include <linux/dcache.h>
40 #include <linux/personality.h>
41 #include <linux/msg.h>
42 #include <linux/shm.h>
43 #include <linux/binfmts.h>
44 #include "smack.h"
46 #define TRANS_TRUE "TRUE"
47 #define TRANS_TRUE_SIZE 4
49 #define SMK_CONNECTING 0
50 #define SMK_RECEIVING 1
51 #define SMK_SENDING 2
53 #if IS_ENABLED(CONFIG_IPV6) && !defined(CONFIG_SECURITY_SMACK_NETFILTER)
54 LIST_HEAD(smk_ipv6_port_list);
55 #endif /* CONFIG_IPV6 && !CONFIG_SECURITY_SMACK_NETFILTER */
56 static struct kmem_cache *smack_inode_cache;
57 int smack_enabled;
59 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
60 static void smk_bu_mode(int mode, char *s)
62 int i = 0;
64 if (mode & MAY_READ)
65 s[i++] = 'r';
66 if (mode & MAY_WRITE)
67 s[i++] = 'w';
68 if (mode & MAY_EXEC)
69 s[i++] = 'x';
70 if (mode & MAY_APPEND)
71 s[i++] = 'a';
72 if (mode & MAY_TRANSMUTE)
73 s[i++] = 't';
74 if (mode & MAY_LOCK)
75 s[i++] = 'l';
76 if (i == 0)
77 s[i++] = '-';
78 s[i] = '\0';
80 #endif
82 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
83 static int smk_bu_note(char *note, struct smack_known *sskp,
84 struct smack_known *oskp, int mode, int rc)
86 char acc[SMK_NUM_ACCESS_TYPE + 1];
88 if (rc <= 0)
89 return rc;
91 smk_bu_mode(mode, acc);
92 pr_info("Smack Bringup: (%s %s %s) %s\n",
93 sskp->smk_known, oskp->smk_known, acc, note);
94 return 0;
96 #else
97 #define smk_bu_note(note, sskp, oskp, mode, RC) (RC)
98 #endif
100 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
101 static int smk_bu_current(char *note, struct smack_known *oskp,
102 int mode, int rc)
104 struct task_smack *tsp = current_security();
105 char acc[SMK_NUM_ACCESS_TYPE + 1];
107 if (rc <= 0)
108 return rc;
110 smk_bu_mode(mode, acc);
111 pr_info("Smack Bringup: (%s %s %s) %s %s\n",
112 tsp->smk_task->smk_known, oskp->smk_known,
113 acc, current->comm, note);
114 return 0;
116 #else
117 #define smk_bu_current(note, oskp, mode, RC) (RC)
118 #endif
120 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
121 static int smk_bu_task(struct task_struct *otp, int mode, int rc)
123 struct task_smack *tsp = current_security();
124 struct smack_known *smk_task = smk_of_task_struct(otp);
125 char acc[SMK_NUM_ACCESS_TYPE + 1];
127 if (rc <= 0)
128 return rc;
130 smk_bu_mode(mode, acc);
131 pr_info("Smack Bringup: (%s %s %s) %s to %s\n",
132 tsp->smk_task->smk_known, smk_task->smk_known, acc,
133 current->comm, otp->comm);
134 return 0;
136 #else
137 #define smk_bu_task(otp, mode, RC) (RC)
138 #endif
140 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
141 static int smk_bu_inode(struct inode *inode, int mode, int rc)
143 struct task_smack *tsp = current_security();
144 char acc[SMK_NUM_ACCESS_TYPE + 1];
146 if (rc <= 0)
147 return rc;
149 smk_bu_mode(mode, acc);
150 pr_info("Smack Bringup: (%s %s %s) inode=(%s %ld) %s\n",
151 tsp->smk_task->smk_known, smk_of_inode(inode)->smk_known, acc,
152 inode->i_sb->s_id, inode->i_ino, current->comm);
153 return 0;
155 #else
156 #define smk_bu_inode(inode, mode, RC) (RC)
157 #endif
159 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
160 static int smk_bu_file(struct file *file, int mode, int rc)
162 struct task_smack *tsp = current_security();
163 struct smack_known *sskp = tsp->smk_task;
164 struct inode *inode = file_inode(file);
165 char acc[SMK_NUM_ACCESS_TYPE + 1];
167 if (rc <= 0)
168 return rc;
170 smk_bu_mode(mode, acc);
171 pr_info("Smack Bringup: (%s %s %s) file=(%s %ld %pD) %s\n",
172 sskp->smk_known, smk_of_inode(inode)->smk_known, acc,
173 inode->i_sb->s_id, inode->i_ino, file,
174 current->comm);
175 return 0;
177 #else
178 #define smk_bu_file(file, mode, RC) (RC)
179 #endif
181 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
182 static int smk_bu_credfile(const struct cred *cred, struct file *file,
183 int mode, int rc)
185 struct task_smack *tsp = cred->security;
186 struct smack_known *sskp = tsp->smk_task;
187 struct inode *inode = file->f_inode;
188 char acc[SMK_NUM_ACCESS_TYPE + 1];
190 if (rc <= 0)
191 return rc;
193 smk_bu_mode(mode, acc);
194 pr_info("Smack Bringup: (%s %s %s) file=(%s %ld %pD) %s\n",
195 sskp->smk_known, smk_of_inode(inode)->smk_known, acc,
196 inode->i_sb->s_id, inode->i_ino, file,
197 current->comm);
198 return 0;
200 #else
201 #define smk_bu_credfile(cred, file, mode, RC) (RC)
202 #endif
205 * smk_fetch - Fetch the smack label from a file.
206 * @name: type of the label (attribute)
207 * @ip: a pointer to the inode
208 * @dp: a pointer to the dentry
210 * Returns a pointer to the master list entry for the Smack label
211 * or NULL if there was no label to fetch.
213 static struct smack_known *smk_fetch(const char *name, struct inode *ip,
214 struct dentry *dp)
216 int rc;
217 char *buffer;
218 struct smack_known *skp = NULL;
220 if (ip->i_op->getxattr == NULL)
221 return NULL;
223 buffer = kzalloc(SMK_LONGLABEL, GFP_KERNEL);
224 if (buffer == NULL)
225 return NULL;
227 rc = ip->i_op->getxattr(dp, name, buffer, SMK_LONGLABEL);
228 if (rc > 0)
229 skp = smk_import_entry(buffer, rc);
231 kfree(buffer);
233 return skp;
237 * new_inode_smack - allocate an inode security blob
238 * @skp: a pointer to the Smack label entry to use in the blob
240 * Returns the new blob or NULL if there's no memory available
242 struct inode_smack *new_inode_smack(struct smack_known *skp)
244 struct inode_smack *isp;
246 isp = kmem_cache_zalloc(smack_inode_cache, GFP_NOFS);
247 if (isp == NULL)
248 return NULL;
250 isp->smk_inode = skp;
251 isp->smk_flags = 0;
252 mutex_init(&isp->smk_lock);
254 return isp;
258 * new_task_smack - allocate a task security blob
259 * @task: a pointer to the Smack label for the running task
260 * @forked: a pointer to the Smack label for the forked task
261 * @gfp: type of the memory for the allocation
263 * Returns the new blob or NULL if there's no memory available
265 static struct task_smack *new_task_smack(struct smack_known *task,
266 struct smack_known *forked, gfp_t gfp)
268 struct task_smack *tsp;
270 tsp = kzalloc(sizeof(struct task_smack), gfp);
271 if (tsp == NULL)
272 return NULL;
274 tsp->smk_task = task;
275 tsp->smk_forked = forked;
276 INIT_LIST_HEAD(&tsp->smk_rules);
277 mutex_init(&tsp->smk_rules_lock);
279 return tsp;
283 * smk_copy_rules - copy a rule set
284 * @nhead: new rules header pointer
285 * @ohead: old rules header pointer
286 * @gfp: type of the memory for the allocation
288 * Returns 0 on success, -ENOMEM on error
290 static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead,
291 gfp_t gfp)
293 struct smack_rule *nrp;
294 struct smack_rule *orp;
295 int rc = 0;
297 INIT_LIST_HEAD(nhead);
299 list_for_each_entry_rcu(orp, ohead, list) {
300 nrp = kzalloc(sizeof(struct smack_rule), gfp);
301 if (nrp == NULL) {
302 rc = -ENOMEM;
303 break;
305 *nrp = *orp;
306 list_add_rcu(&nrp->list, nhead);
308 return rc;
312 * smk_ptrace_mode - helper function for converting PTRACE_MODE_* into MAY_*
313 * @mode - input mode in form of PTRACE_MODE_*
315 * Returns a converted MAY_* mode usable by smack rules
317 static inline unsigned int smk_ptrace_mode(unsigned int mode)
319 switch (mode) {
320 case PTRACE_MODE_READ:
321 return MAY_READ;
322 case PTRACE_MODE_ATTACH:
323 return MAY_READWRITE;
326 return 0;
330 * smk_ptrace_rule_check - helper for ptrace access
331 * @tracer: tracer process
332 * @tracee_known: label entry of the process that's about to be traced
333 * @mode: ptrace attachment mode (PTRACE_MODE_*)
334 * @func: name of the function that called us, used for audit
336 * Returns 0 on access granted, -error on error
338 static int smk_ptrace_rule_check(struct task_struct *tracer,
339 struct smack_known *tracee_known,
340 unsigned int mode, const char *func)
342 int rc;
343 struct smk_audit_info ad, *saip = NULL;
344 struct task_smack *tsp;
345 struct smack_known *tracer_known;
347 if ((mode & PTRACE_MODE_NOAUDIT) == 0) {
348 smk_ad_init(&ad, func, LSM_AUDIT_DATA_TASK);
349 smk_ad_setfield_u_tsk(&ad, tracer);
350 saip = &ad;
353 rcu_read_lock();
354 tsp = __task_cred(tracer)->security;
355 tracer_known = smk_of_task(tsp);
357 if ((mode & PTRACE_MODE_ATTACH) &&
358 (smack_ptrace_rule == SMACK_PTRACE_EXACT ||
359 smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)) {
360 if (tracer_known->smk_known == tracee_known->smk_known)
361 rc = 0;
362 else if (smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)
363 rc = -EACCES;
364 else if (capable(CAP_SYS_PTRACE))
365 rc = 0;
366 else
367 rc = -EACCES;
369 if (saip)
370 smack_log(tracer_known->smk_known,
371 tracee_known->smk_known,
372 0, rc, saip);
374 rcu_read_unlock();
375 return rc;
378 /* In case of rule==SMACK_PTRACE_DEFAULT or mode==PTRACE_MODE_READ */
379 rc = smk_tskacc(tsp, tracee_known, smk_ptrace_mode(mode), saip);
381 rcu_read_unlock();
382 return rc;
386 * LSM hooks.
387 * We he, that is fun!
391 * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH
392 * @ctp: child task pointer
393 * @mode: ptrace attachment mode (PTRACE_MODE_*)
395 * Returns 0 if access is OK, an error code otherwise
397 * Do the capability checks.
399 static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode)
401 int rc;
402 struct smack_known *skp;
404 rc = cap_ptrace_access_check(ctp, mode);
405 if (rc != 0)
406 return rc;
408 skp = smk_of_task_struct(ctp);
410 rc = smk_ptrace_rule_check(current, skp, mode, __func__);
411 return rc;
415 * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
416 * @ptp: parent task pointer
418 * Returns 0 if access is OK, an error code otherwise
420 * Do the capability checks, and require PTRACE_MODE_ATTACH.
422 static int smack_ptrace_traceme(struct task_struct *ptp)
424 int rc;
425 struct smack_known *skp;
427 rc = cap_ptrace_traceme(ptp);
428 if (rc != 0)
429 return rc;
431 skp = smk_of_task(current_security());
433 rc = smk_ptrace_rule_check(ptp, skp, PTRACE_MODE_ATTACH, __func__);
434 return rc;
438 * smack_syslog - Smack approval on syslog
439 * @type: message type
441 * Returns 0 on success, error code otherwise.
443 static int smack_syslog(int typefrom_file)
445 int rc = 0;
446 struct smack_known *skp = smk_of_current();
448 if (smack_privileged(CAP_MAC_OVERRIDE))
449 return 0;
451 if (smack_syslog_label != NULL && smack_syslog_label != skp)
452 rc = -EACCES;
454 return rc;
459 * Superblock Hooks.
463 * smack_sb_alloc_security - allocate a superblock blob
464 * @sb: the superblock getting the blob
466 * Returns 0 on success or -ENOMEM on error.
468 static int smack_sb_alloc_security(struct super_block *sb)
470 struct superblock_smack *sbsp;
472 sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL);
474 if (sbsp == NULL)
475 return -ENOMEM;
477 sbsp->smk_root = &smack_known_floor;
478 sbsp->smk_default = &smack_known_floor;
479 sbsp->smk_floor = &smack_known_floor;
480 sbsp->smk_hat = &smack_known_hat;
482 * smk_initialized will be zero from kzalloc.
484 sb->s_security = sbsp;
486 return 0;
490 * smack_sb_free_security - free a superblock blob
491 * @sb: the superblock getting the blob
494 static void smack_sb_free_security(struct super_block *sb)
496 kfree(sb->s_security);
497 sb->s_security = NULL;
501 * smack_sb_copy_data - copy mount options data for processing
502 * @orig: where to start
503 * @smackopts: mount options string
505 * Returns 0 on success or -ENOMEM on error.
507 * Copy the Smack specific mount options out of the mount
508 * options list.
510 static int smack_sb_copy_data(char *orig, char *smackopts)
512 char *cp, *commap, *otheropts, *dp;
514 otheropts = (char *)get_zeroed_page(GFP_KERNEL);
515 if (otheropts == NULL)
516 return -ENOMEM;
518 for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) {
519 if (strstr(cp, SMK_FSDEFAULT) == cp)
520 dp = smackopts;
521 else if (strstr(cp, SMK_FSFLOOR) == cp)
522 dp = smackopts;
523 else if (strstr(cp, SMK_FSHAT) == cp)
524 dp = smackopts;
525 else if (strstr(cp, SMK_FSROOT) == cp)
526 dp = smackopts;
527 else if (strstr(cp, SMK_FSTRANS) == cp)
528 dp = smackopts;
529 else
530 dp = otheropts;
532 commap = strchr(cp, ',');
533 if (commap != NULL)
534 *commap = '\0';
536 if (*dp != '\0')
537 strcat(dp, ",");
538 strcat(dp, cp);
541 strcpy(orig, otheropts);
542 free_page((unsigned long)otheropts);
544 return 0;
548 * smack_sb_kern_mount - Smack specific mount processing
549 * @sb: the file system superblock
550 * @flags: the mount flags
551 * @data: the smack mount options
553 * Returns 0 on success, an error code on failure
555 static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data)
557 struct dentry *root = sb->s_root;
558 struct inode *inode = root->d_inode;
559 struct superblock_smack *sp = sb->s_security;
560 struct inode_smack *isp;
561 struct smack_known *skp;
562 char *op;
563 char *commap;
564 int transmute = 0;
565 int specified = 0;
567 if (sp->smk_initialized)
568 return 0;
570 sp->smk_initialized = 1;
572 for (op = data; op != NULL; op = commap) {
573 commap = strchr(op, ',');
574 if (commap != NULL)
575 *commap++ = '\0';
577 if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) {
578 op += strlen(SMK_FSHAT);
579 skp = smk_import_entry(op, 0);
580 if (skp != NULL) {
581 sp->smk_hat = skp;
582 specified = 1;
584 } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) {
585 op += strlen(SMK_FSFLOOR);
586 skp = smk_import_entry(op, 0);
587 if (skp != NULL) {
588 sp->smk_floor = skp;
589 specified = 1;
591 } else if (strncmp(op, SMK_FSDEFAULT,
592 strlen(SMK_FSDEFAULT)) == 0) {
593 op += strlen(SMK_FSDEFAULT);
594 skp = smk_import_entry(op, 0);
595 if (skp != NULL) {
596 sp->smk_default = skp;
597 specified = 1;
599 } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) {
600 op += strlen(SMK_FSROOT);
601 skp = smk_import_entry(op, 0);
602 if (skp != NULL) {
603 sp->smk_root = skp;
604 specified = 1;
606 } else if (strncmp(op, SMK_FSTRANS, strlen(SMK_FSTRANS)) == 0) {
607 op += strlen(SMK_FSTRANS);
608 skp = smk_import_entry(op, 0);
609 if (skp != NULL) {
610 sp->smk_root = skp;
611 transmute = 1;
612 specified = 1;
617 if (!smack_privileged(CAP_MAC_ADMIN)) {
619 * Unprivileged mounts don't get to specify Smack values.
621 if (specified)
622 return -EPERM;
624 * Unprivileged mounts get root and default from the caller.
626 skp = smk_of_current();
627 sp->smk_root = skp;
628 sp->smk_default = skp;
631 * Initialize the root inode.
633 isp = inode->i_security;
634 if (isp == NULL) {
635 isp = new_inode_smack(sp->smk_root);
636 if (isp == NULL)
637 return -ENOMEM;
638 inode->i_security = isp;
639 } else
640 isp->smk_inode = sp->smk_root;
642 if (transmute)
643 isp->smk_flags |= SMK_INODE_TRANSMUTE;
645 return 0;
649 * smack_sb_statfs - Smack check on statfs
650 * @dentry: identifies the file system in question
652 * Returns 0 if current can read the floor of the filesystem,
653 * and error code otherwise
655 static int smack_sb_statfs(struct dentry *dentry)
657 struct superblock_smack *sbp = dentry->d_sb->s_security;
658 int rc;
659 struct smk_audit_info ad;
661 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
662 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
664 rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad);
665 rc = smk_bu_current("statfs", sbp->smk_floor, MAY_READ, rc);
666 return rc;
670 * BPRM hooks
674 * smack_bprm_set_creds - set creds for exec
675 * @bprm: the exec information
677 * Returns 0 if it gets a blob, -EPERM if exec forbidden and -ENOMEM otherwise
679 static int smack_bprm_set_creds(struct linux_binprm *bprm)
681 struct inode *inode = file_inode(bprm->file);
682 struct task_smack *bsp = bprm->cred->security;
683 struct inode_smack *isp;
684 int rc;
686 rc = cap_bprm_set_creds(bprm);
687 if (rc != 0)
688 return rc;
690 if (bprm->cred_prepared)
691 return 0;
693 isp = inode->i_security;
694 if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task)
695 return 0;
697 if (bprm->unsafe & (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) {
698 struct task_struct *tracer;
699 rc = 0;
701 rcu_read_lock();
702 tracer = ptrace_parent(current);
703 if (likely(tracer != NULL))
704 rc = smk_ptrace_rule_check(tracer,
705 isp->smk_task,
706 PTRACE_MODE_ATTACH,
707 __func__);
708 rcu_read_unlock();
710 if (rc != 0)
711 return rc;
712 } else if (bprm->unsafe)
713 return -EPERM;
715 bsp->smk_task = isp->smk_task;
716 bprm->per_clear |= PER_CLEAR_ON_SETID;
718 return 0;
722 * smack_bprm_committing_creds - Prepare to install the new credentials
723 * from bprm.
725 * @bprm: binprm for exec
727 static void smack_bprm_committing_creds(struct linux_binprm *bprm)
729 struct task_smack *bsp = bprm->cred->security;
731 if (bsp->smk_task != bsp->smk_forked)
732 current->pdeath_signal = 0;
736 * smack_bprm_secureexec - Return the decision to use secureexec.
737 * @bprm: binprm for exec
739 * Returns 0 on success.
741 static int smack_bprm_secureexec(struct linux_binprm *bprm)
743 struct task_smack *tsp = current_security();
744 int ret = cap_bprm_secureexec(bprm);
746 if (!ret && (tsp->smk_task != tsp->smk_forked))
747 ret = 1;
749 return ret;
753 * Inode hooks
757 * smack_inode_alloc_security - allocate an inode blob
758 * @inode: the inode in need of a blob
760 * Returns 0 if it gets a blob, -ENOMEM otherwise
762 static int smack_inode_alloc_security(struct inode *inode)
764 struct smack_known *skp = smk_of_current();
766 inode->i_security = new_inode_smack(skp);
767 if (inode->i_security == NULL)
768 return -ENOMEM;
769 return 0;
773 * smack_inode_free_security - free an inode blob
774 * @inode: the inode with a blob
776 * Clears the blob pointer in inode
778 static void smack_inode_free_security(struct inode *inode)
780 kmem_cache_free(smack_inode_cache, inode->i_security);
781 inode->i_security = NULL;
785 * smack_inode_init_security - copy out the smack from an inode
786 * @inode: the newly created inode
787 * @dir: containing directory object
788 * @qstr: unused
789 * @name: where to put the attribute name
790 * @value: where to put the attribute value
791 * @len: where to put the length of the attribute
793 * Returns 0 if it all works out, -ENOMEM if there's no memory
795 static int smack_inode_init_security(struct inode *inode, struct inode *dir,
796 const struct qstr *qstr, const char **name,
797 void **value, size_t *len)
799 struct inode_smack *issp = inode->i_security;
800 struct smack_known *skp = smk_of_current();
801 struct smack_known *isp = smk_of_inode(inode);
802 struct smack_known *dsp = smk_of_inode(dir);
803 int may;
805 if (name)
806 *name = XATTR_SMACK_SUFFIX;
808 if (value && len) {
809 rcu_read_lock();
810 may = smk_access_entry(skp->smk_known, dsp->smk_known,
811 &skp->smk_rules);
812 rcu_read_unlock();
815 * If the access rule allows transmutation and
816 * the directory requests transmutation then
817 * by all means transmute.
818 * Mark the inode as changed.
820 if (may > 0 && ((may & MAY_TRANSMUTE) != 0) &&
821 smk_inode_transmutable(dir)) {
822 isp = dsp;
823 issp->smk_flags |= SMK_INODE_CHANGED;
826 *value = kstrdup(isp->smk_known, GFP_NOFS);
827 if (*value == NULL)
828 return -ENOMEM;
830 *len = strlen(isp->smk_known);
833 return 0;
837 * smack_inode_link - Smack check on link
838 * @old_dentry: the existing object
839 * @dir: unused
840 * @new_dentry: the new object
842 * Returns 0 if access is permitted, an error code otherwise
844 static int smack_inode_link(struct dentry *old_dentry, struct inode *dir,
845 struct dentry *new_dentry)
847 struct smack_known *isp;
848 struct smk_audit_info ad;
849 int rc;
851 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
852 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
854 isp = smk_of_inode(old_dentry->d_inode);
855 rc = smk_curacc(isp, MAY_WRITE, &ad);
856 rc = smk_bu_inode(old_dentry->d_inode, MAY_WRITE, rc);
858 if (rc == 0 && d_is_positive(new_dentry)) {
859 isp = smk_of_inode(new_dentry->d_inode);
860 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
861 rc = smk_curacc(isp, MAY_WRITE, &ad);
862 rc = smk_bu_inode(new_dentry->d_inode, MAY_WRITE, rc);
865 return rc;
869 * smack_inode_unlink - Smack check on inode deletion
870 * @dir: containing directory object
871 * @dentry: file to unlink
873 * Returns 0 if current can write the containing directory
874 * and the object, error code otherwise
876 static int smack_inode_unlink(struct inode *dir, struct dentry *dentry)
878 struct inode *ip = dentry->d_inode;
879 struct smk_audit_info ad;
880 int rc;
882 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
883 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
886 * You need write access to the thing you're unlinking
888 rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad);
889 rc = smk_bu_inode(ip, MAY_WRITE, rc);
890 if (rc == 0) {
892 * You also need write access to the containing directory
894 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
895 smk_ad_setfield_u_fs_inode(&ad, dir);
896 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
897 rc = smk_bu_inode(dir, MAY_WRITE, rc);
899 return rc;
903 * smack_inode_rmdir - Smack check on directory deletion
904 * @dir: containing directory object
905 * @dentry: directory to unlink
907 * Returns 0 if current can write the containing directory
908 * and the directory, error code otherwise
910 static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry)
912 struct smk_audit_info ad;
913 int rc;
915 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
916 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
919 * You need write access to the thing you're removing
921 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
922 rc = smk_bu_inode(dentry->d_inode, MAY_WRITE, rc);
923 if (rc == 0) {
925 * You also need write access to the containing directory
927 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
928 smk_ad_setfield_u_fs_inode(&ad, dir);
929 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
930 rc = smk_bu_inode(dir, MAY_WRITE, rc);
933 return rc;
937 * smack_inode_rename - Smack check on rename
938 * @old_inode: unused
939 * @old_dentry: the old object
940 * @new_inode: unused
941 * @new_dentry: the new object
943 * Read and write access is required on both the old and
944 * new directories.
946 * Returns 0 if access is permitted, an error code otherwise
948 static int smack_inode_rename(struct inode *old_inode,
949 struct dentry *old_dentry,
950 struct inode *new_inode,
951 struct dentry *new_dentry)
953 int rc;
954 struct smack_known *isp;
955 struct smk_audit_info ad;
957 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
958 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
960 isp = smk_of_inode(old_dentry->d_inode);
961 rc = smk_curacc(isp, MAY_READWRITE, &ad);
962 rc = smk_bu_inode(old_dentry->d_inode, MAY_READWRITE, rc);
964 if (rc == 0 && d_is_positive(new_dentry)) {
965 isp = smk_of_inode(new_dentry->d_inode);
966 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
967 rc = smk_curacc(isp, MAY_READWRITE, &ad);
968 rc = smk_bu_inode(new_dentry->d_inode, MAY_READWRITE, rc);
970 return rc;
974 * smack_inode_permission - Smack version of permission()
975 * @inode: the inode in question
976 * @mask: the access requested
978 * This is the important Smack hook.
980 * Returns 0 if access is permitted, -EACCES otherwise
982 static int smack_inode_permission(struct inode *inode, int mask)
984 struct smk_audit_info ad;
985 int no_block = mask & MAY_NOT_BLOCK;
986 int rc;
988 mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND);
990 * No permission to check. Existence test. Yup, it's there.
992 if (mask == 0)
993 return 0;
995 /* May be droppable after audit */
996 if (no_block)
997 return -ECHILD;
998 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
999 smk_ad_setfield_u_fs_inode(&ad, inode);
1000 rc = smk_curacc(smk_of_inode(inode), mask, &ad);
1001 rc = smk_bu_inode(inode, mask, rc);
1002 return rc;
1006 * smack_inode_setattr - Smack check for setting attributes
1007 * @dentry: the object
1008 * @iattr: for the force flag
1010 * Returns 0 if access is permitted, an error code otherwise
1012 static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr)
1014 struct smk_audit_info ad;
1015 int rc;
1018 * Need to allow for clearing the setuid bit.
1020 if (iattr->ia_valid & ATTR_FORCE)
1021 return 0;
1022 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1023 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1025 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
1026 rc = smk_bu_inode(dentry->d_inode, MAY_WRITE, rc);
1027 return rc;
1031 * smack_inode_getattr - Smack check for getting attributes
1032 * @mnt: vfsmount of the object
1033 * @dentry: the object
1035 * Returns 0 if access is permitted, an error code otherwise
1037 static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
1039 struct smk_audit_info ad;
1040 struct path path;
1041 int rc;
1043 path.dentry = dentry;
1044 path.mnt = mnt;
1046 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1047 smk_ad_setfield_u_fs_path(&ad, path);
1048 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad);
1049 rc = smk_bu_inode(dentry->d_inode, MAY_READ, rc);
1050 return rc;
1054 * smack_inode_setxattr - Smack check for setting xattrs
1055 * @dentry: the object
1056 * @name: name of the attribute
1057 * @value: value of the attribute
1058 * @size: size of the value
1059 * @flags: unused
1061 * This protects the Smack attribute explicitly.
1063 * Returns 0 if access is permitted, an error code otherwise
1065 static int smack_inode_setxattr(struct dentry *dentry, const char *name,
1066 const void *value, size_t size, int flags)
1068 struct smk_audit_info ad;
1069 struct smack_known *skp;
1070 int check_priv = 0;
1071 int check_import = 0;
1072 int check_star = 0;
1073 int rc = 0;
1076 * Check label validity here so import won't fail in post_setxattr
1078 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
1079 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
1080 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) {
1081 check_priv = 1;
1082 check_import = 1;
1083 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
1084 strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
1085 check_priv = 1;
1086 check_import = 1;
1087 check_star = 1;
1088 } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
1089 check_priv = 1;
1090 if (size != TRANS_TRUE_SIZE ||
1091 strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0)
1092 rc = -EINVAL;
1093 } else
1094 rc = cap_inode_setxattr(dentry, name, value, size, flags);
1096 if (check_priv && !smack_privileged(CAP_MAC_ADMIN))
1097 rc = -EPERM;
1099 if (rc == 0 && check_import) {
1100 skp = size ? smk_import_entry(value, size) : NULL;
1101 if (skp == NULL || (check_star &&
1102 (skp == &smack_known_star || skp == &smack_known_web)))
1103 rc = -EINVAL;
1106 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1107 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1109 if (rc == 0) {
1110 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
1111 rc = smk_bu_inode(dentry->d_inode, MAY_WRITE, rc);
1114 return rc;
1118 * smack_inode_post_setxattr - Apply the Smack update approved above
1119 * @dentry: object
1120 * @name: attribute name
1121 * @value: attribute value
1122 * @size: attribute size
1123 * @flags: unused
1125 * Set the pointer in the inode blob to the entry found
1126 * in the master label list.
1128 static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
1129 const void *value, size_t size, int flags)
1131 struct smack_known *skp;
1132 struct inode_smack *isp = dentry->d_inode->i_security;
1134 if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
1135 isp->smk_flags |= SMK_INODE_TRANSMUTE;
1136 return;
1139 if (strcmp(name, XATTR_NAME_SMACK) == 0) {
1140 skp = smk_import_entry(value, size);
1141 if (skp != NULL)
1142 isp->smk_inode = skp;
1143 else
1144 isp->smk_inode = &smack_known_invalid;
1145 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) {
1146 skp = smk_import_entry(value, size);
1147 if (skp != NULL)
1148 isp->smk_task = skp;
1149 else
1150 isp->smk_task = &smack_known_invalid;
1151 } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
1152 skp = smk_import_entry(value, size);
1153 if (skp != NULL)
1154 isp->smk_mmap = skp;
1155 else
1156 isp->smk_mmap = &smack_known_invalid;
1159 return;
1163 * smack_inode_getxattr - Smack check on getxattr
1164 * @dentry: the object
1165 * @name: unused
1167 * Returns 0 if access is permitted, an error code otherwise
1169 static int smack_inode_getxattr(struct dentry *dentry, const char *name)
1171 struct smk_audit_info ad;
1172 int rc;
1174 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1175 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1177 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad);
1178 rc = smk_bu_inode(dentry->d_inode, MAY_READ, rc);
1179 return rc;
1183 * smack_inode_removexattr - Smack check on removexattr
1184 * @dentry: the object
1185 * @name: name of the attribute
1187 * Removing the Smack attribute requires CAP_MAC_ADMIN
1189 * Returns 0 if access is permitted, an error code otherwise
1191 static int smack_inode_removexattr(struct dentry *dentry, const char *name)
1193 struct inode_smack *isp;
1194 struct smk_audit_info ad;
1195 int rc = 0;
1197 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
1198 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
1199 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
1200 strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
1201 strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 ||
1202 strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
1203 if (!smack_privileged(CAP_MAC_ADMIN))
1204 rc = -EPERM;
1205 } else
1206 rc = cap_inode_removexattr(dentry, name);
1208 if (rc != 0)
1209 return rc;
1211 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1212 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1214 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
1215 rc = smk_bu_inode(dentry->d_inode, MAY_WRITE, rc);
1216 if (rc != 0)
1217 return rc;
1219 isp = dentry->d_inode->i_security;
1221 * Don't do anything special for these.
1222 * XATTR_NAME_SMACKIPIN
1223 * XATTR_NAME_SMACKIPOUT
1224 * XATTR_NAME_SMACKEXEC
1226 if (strcmp(name, XATTR_NAME_SMACK) == 0)
1227 isp->smk_task = NULL;
1228 else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0)
1229 isp->smk_mmap = NULL;
1230 else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0)
1231 isp->smk_flags &= ~SMK_INODE_TRANSMUTE;
1233 return 0;
1237 * smack_inode_getsecurity - get smack xattrs
1238 * @inode: the object
1239 * @name: attribute name
1240 * @buffer: where to put the result
1241 * @alloc: unused
1243 * Returns the size of the attribute or an error code
1245 static int smack_inode_getsecurity(const struct inode *inode,
1246 const char *name, void **buffer,
1247 bool alloc)
1249 struct socket_smack *ssp;
1250 struct socket *sock;
1251 struct super_block *sbp;
1252 struct inode *ip = (struct inode *)inode;
1253 struct smack_known *isp;
1254 int ilen;
1255 int rc = 0;
1257 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
1258 isp = smk_of_inode(inode);
1259 ilen = strlen(isp->smk_known);
1260 *buffer = isp->smk_known;
1261 return ilen;
1265 * The rest of the Smack xattrs are only on sockets.
1267 sbp = ip->i_sb;
1268 if (sbp->s_magic != SOCKFS_MAGIC)
1269 return -EOPNOTSUPP;
1271 sock = SOCKET_I(ip);
1272 if (sock == NULL || sock->sk == NULL)
1273 return -EOPNOTSUPP;
1275 ssp = sock->sk->sk_security;
1277 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
1278 isp = ssp->smk_in;
1279 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0)
1280 isp = ssp->smk_out;
1281 else
1282 return -EOPNOTSUPP;
1284 ilen = strlen(isp->smk_known);
1285 if (rc == 0) {
1286 *buffer = isp->smk_known;
1287 rc = ilen;
1290 return rc;
1295 * smack_inode_listsecurity - list the Smack attributes
1296 * @inode: the object
1297 * @buffer: where they go
1298 * @buffer_size: size of buffer
1300 * Returns 0 on success, -EINVAL otherwise
1302 static int smack_inode_listsecurity(struct inode *inode, char *buffer,
1303 size_t buffer_size)
1305 int len = sizeof(XATTR_NAME_SMACK);
1307 if (buffer != NULL && len <= buffer_size)
1308 memcpy(buffer, XATTR_NAME_SMACK, len);
1310 return len;
1314 * smack_inode_getsecid - Extract inode's security id
1315 * @inode: inode to extract the info from
1316 * @secid: where result will be saved
1318 static void smack_inode_getsecid(const struct inode *inode, u32 *secid)
1320 struct inode_smack *isp = inode->i_security;
1322 *secid = isp->smk_inode->smk_secid;
1326 * File Hooks
1330 * smack_file_permission - Smack check on file operations
1331 * @file: unused
1332 * @mask: unused
1334 * Returns 0
1336 * Should access checks be done on each read or write?
1337 * UNICOS and SELinux say yes.
1338 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
1340 * I'll say no for now. Smack does not do the frequent
1341 * label changing that SELinux does.
1343 static int smack_file_permission(struct file *file, int mask)
1345 return 0;
1349 * smack_file_alloc_security - assign a file security blob
1350 * @file: the object
1352 * The security blob for a file is a pointer to the master
1353 * label list, so no allocation is done.
1355 * f_security is the owner security information. It
1356 * isn't used on file access checks, it's for send_sigio.
1358 * Returns 0
1360 static int smack_file_alloc_security(struct file *file)
1362 struct smack_known *skp = smk_of_current();
1364 file->f_security = skp;
1365 return 0;
1369 * smack_file_free_security - clear a file security blob
1370 * @file: the object
1372 * The security blob for a file is a pointer to the master
1373 * label list, so no memory is freed.
1375 static void smack_file_free_security(struct file *file)
1377 file->f_security = NULL;
1381 * smack_file_ioctl - Smack check on ioctls
1382 * @file: the object
1383 * @cmd: what to do
1384 * @arg: unused
1386 * Relies heavily on the correct use of the ioctl command conventions.
1388 * Returns 0 if allowed, error code otherwise
1390 static int smack_file_ioctl(struct file *file, unsigned int cmd,
1391 unsigned long arg)
1393 int rc = 0;
1394 struct smk_audit_info ad;
1395 struct inode *inode = file_inode(file);
1397 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1398 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1400 if (_IOC_DIR(cmd) & _IOC_WRITE) {
1401 rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad);
1402 rc = smk_bu_file(file, MAY_WRITE, rc);
1405 if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) {
1406 rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad);
1407 rc = smk_bu_file(file, MAY_READ, rc);
1410 return rc;
1414 * smack_file_lock - Smack check on file locking
1415 * @file: the object
1416 * @cmd: unused
1418 * Returns 0 if current has lock access, error code otherwise
1420 static int smack_file_lock(struct file *file, unsigned int cmd)
1422 struct smk_audit_info ad;
1423 int rc;
1424 struct inode *inode = file_inode(file);
1426 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1427 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1428 rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad);
1429 rc = smk_bu_file(file, MAY_LOCK, rc);
1430 return rc;
1434 * smack_file_fcntl - Smack check on fcntl
1435 * @file: the object
1436 * @cmd: what action to check
1437 * @arg: unused
1439 * Generally these operations are harmless.
1440 * File locking operations present an obvious mechanism
1441 * for passing information, so they require write access.
1443 * Returns 0 if current has access, error code otherwise
1445 static int smack_file_fcntl(struct file *file, unsigned int cmd,
1446 unsigned long arg)
1448 struct smk_audit_info ad;
1449 int rc = 0;
1450 struct inode *inode = file_inode(file);
1452 switch (cmd) {
1453 case F_GETLK:
1454 break;
1455 case F_SETLK:
1456 case F_SETLKW:
1457 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1458 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1459 rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad);
1460 rc = smk_bu_file(file, MAY_LOCK, rc);
1461 break;
1462 case F_SETOWN:
1463 case F_SETSIG:
1464 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1465 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1466 rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad);
1467 rc = smk_bu_file(file, MAY_WRITE, rc);
1468 break;
1469 default:
1470 break;
1473 return rc;
1477 * smack_mmap_file :
1478 * Check permissions for a mmap operation. The @file may be NULL, e.g.
1479 * if mapping anonymous memory.
1480 * @file contains the file structure for file to map (may be NULL).
1481 * @reqprot contains the protection requested by the application.
1482 * @prot contains the protection that will be applied by the kernel.
1483 * @flags contains the operational flags.
1484 * Return 0 if permission is granted.
1486 static int smack_mmap_file(struct file *file,
1487 unsigned long reqprot, unsigned long prot,
1488 unsigned long flags)
1490 struct smack_known *skp;
1491 struct smack_known *mkp;
1492 struct smack_rule *srp;
1493 struct task_smack *tsp;
1494 struct smack_known *okp;
1495 struct inode_smack *isp;
1496 int may;
1497 int mmay;
1498 int tmay;
1499 int rc;
1501 if (file == NULL)
1502 return 0;
1504 isp = file_inode(file)->i_security;
1505 if (isp->smk_mmap == NULL)
1506 return 0;
1507 mkp = isp->smk_mmap;
1509 tsp = current_security();
1510 skp = smk_of_current();
1511 rc = 0;
1513 rcu_read_lock();
1515 * For each Smack rule associated with the subject
1516 * label verify that the SMACK64MMAP also has access
1517 * to that rule's object label.
1519 list_for_each_entry_rcu(srp, &skp->smk_rules, list) {
1520 okp = srp->smk_object;
1522 * Matching labels always allows access.
1524 if (mkp->smk_known == okp->smk_known)
1525 continue;
1527 * If there is a matching local rule take
1528 * that into account as well.
1530 may = smk_access_entry(srp->smk_subject->smk_known,
1531 okp->smk_known,
1532 &tsp->smk_rules);
1533 if (may == -ENOENT)
1534 may = srp->smk_access;
1535 else
1536 may &= srp->smk_access;
1538 * If may is zero the SMACK64MMAP subject can't
1539 * possibly have less access.
1541 if (may == 0)
1542 continue;
1545 * Fetch the global list entry.
1546 * If there isn't one a SMACK64MMAP subject
1547 * can't have as much access as current.
1549 mmay = smk_access_entry(mkp->smk_known, okp->smk_known,
1550 &mkp->smk_rules);
1551 if (mmay == -ENOENT) {
1552 rc = -EACCES;
1553 break;
1556 * If there is a local entry it modifies the
1557 * potential access, too.
1559 tmay = smk_access_entry(mkp->smk_known, okp->smk_known,
1560 &tsp->smk_rules);
1561 if (tmay != -ENOENT)
1562 mmay &= tmay;
1565 * If there is any access available to current that is
1566 * not available to a SMACK64MMAP subject
1567 * deny access.
1569 if ((may | mmay) != mmay) {
1570 rc = -EACCES;
1571 break;
1575 rcu_read_unlock();
1577 return rc;
1581 * smack_file_set_fowner - set the file security blob value
1582 * @file: object in question
1585 static void smack_file_set_fowner(struct file *file)
1587 file->f_security = smk_of_current();
1591 * smack_file_send_sigiotask - Smack on sigio
1592 * @tsk: The target task
1593 * @fown: the object the signal come from
1594 * @signum: unused
1596 * Allow a privileged task to get signals even if it shouldn't
1598 * Returns 0 if a subject with the object's smack could
1599 * write to the task, an error code otherwise.
1601 static int smack_file_send_sigiotask(struct task_struct *tsk,
1602 struct fown_struct *fown, int signum)
1604 struct smack_known *skp;
1605 struct smack_known *tkp = smk_of_task(tsk->cred->security);
1606 struct file *file;
1607 int rc;
1608 struct smk_audit_info ad;
1611 * struct fown_struct is never outside the context of a struct file
1613 file = container_of(fown, struct file, f_owner);
1615 /* we don't log here as rc can be overriden */
1616 skp = file->f_security;
1617 rc = smk_access(skp, tkp, MAY_WRITE, NULL);
1618 rc = smk_bu_note("sigiotask", skp, tkp, MAY_WRITE, rc);
1619 if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE))
1620 rc = 0;
1622 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1623 smk_ad_setfield_u_tsk(&ad, tsk);
1624 smack_log(skp->smk_known, tkp->smk_known, MAY_WRITE, rc, &ad);
1625 return rc;
1629 * smack_file_receive - Smack file receive check
1630 * @file: the object
1632 * Returns 0 if current has access, error code otherwise
1634 static int smack_file_receive(struct file *file)
1636 int rc;
1637 int may = 0;
1638 struct smk_audit_info ad;
1639 struct inode *inode = file_inode(file);
1641 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1642 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1644 * This code relies on bitmasks.
1646 if (file->f_mode & FMODE_READ)
1647 may = MAY_READ;
1648 if (file->f_mode & FMODE_WRITE)
1649 may |= MAY_WRITE;
1651 rc = smk_curacc(smk_of_inode(inode), may, &ad);
1652 rc = smk_bu_file(file, may, rc);
1653 return rc;
1657 * smack_file_open - Smack dentry open processing
1658 * @file: the object
1659 * @cred: task credential
1661 * Set the security blob in the file structure.
1662 * Allow the open only if the task has read access. There are
1663 * many read operations (e.g. fstat) that you can do with an
1664 * fd even if you have the file open write-only.
1666 * Returns 0
1668 static int smack_file_open(struct file *file, const struct cred *cred)
1670 struct task_smack *tsp = cred->security;
1671 struct inode *inode = file_inode(file);
1672 struct smk_audit_info ad;
1673 int rc;
1675 if (smack_privileged(CAP_MAC_OVERRIDE))
1676 return 0;
1678 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1679 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1680 rc = smk_access(tsp->smk_task, smk_of_inode(inode), MAY_READ, &ad);
1681 rc = smk_bu_credfile(cred, file, MAY_READ, rc);
1683 return rc;
1687 * Task hooks
1691 * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1692 * @new: the new credentials
1693 * @gfp: the atomicity of any memory allocations
1695 * Prepare a blank set of credentials for modification. This must allocate all
1696 * the memory the LSM module might require such that cred_transfer() can
1697 * complete without error.
1699 static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp)
1701 struct task_smack *tsp;
1703 tsp = new_task_smack(NULL, NULL, gfp);
1704 if (tsp == NULL)
1705 return -ENOMEM;
1707 cred->security = tsp;
1709 return 0;
1714 * smack_cred_free - "free" task-level security credentials
1715 * @cred: the credentials in question
1718 static void smack_cred_free(struct cred *cred)
1720 struct task_smack *tsp = cred->security;
1721 struct smack_rule *rp;
1722 struct list_head *l;
1723 struct list_head *n;
1725 if (tsp == NULL)
1726 return;
1727 cred->security = NULL;
1729 list_for_each_safe(l, n, &tsp->smk_rules) {
1730 rp = list_entry(l, struct smack_rule, list);
1731 list_del(&rp->list);
1732 kfree(rp);
1734 kfree(tsp);
1738 * smack_cred_prepare - prepare new set of credentials for modification
1739 * @new: the new credentials
1740 * @old: the original credentials
1741 * @gfp: the atomicity of any memory allocations
1743 * Prepare a new set of credentials for modification.
1745 static int smack_cred_prepare(struct cred *new, const struct cred *old,
1746 gfp_t gfp)
1748 struct task_smack *old_tsp = old->security;
1749 struct task_smack *new_tsp;
1750 int rc;
1752 new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp);
1753 if (new_tsp == NULL)
1754 return -ENOMEM;
1756 rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp);
1757 if (rc != 0)
1758 return rc;
1760 new->security = new_tsp;
1761 return 0;
1765 * smack_cred_transfer - Transfer the old credentials to the new credentials
1766 * @new: the new credentials
1767 * @old: the original credentials
1769 * Fill in a set of blank credentials from another set of credentials.
1771 static void smack_cred_transfer(struct cred *new, const struct cred *old)
1773 struct task_smack *old_tsp = old->security;
1774 struct task_smack *new_tsp = new->security;
1776 new_tsp->smk_task = old_tsp->smk_task;
1777 new_tsp->smk_forked = old_tsp->smk_task;
1778 mutex_init(&new_tsp->smk_rules_lock);
1779 INIT_LIST_HEAD(&new_tsp->smk_rules);
1782 /* cbs copy rule list */
1786 * smack_kernel_act_as - Set the subjective context in a set of credentials
1787 * @new: points to the set of credentials to be modified.
1788 * @secid: specifies the security ID to be set
1790 * Set the security data for a kernel service.
1792 static int smack_kernel_act_as(struct cred *new, u32 secid)
1794 struct task_smack *new_tsp = new->security;
1795 struct smack_known *skp = smack_from_secid(secid);
1797 if (skp == NULL)
1798 return -EINVAL;
1800 new_tsp->smk_task = skp;
1801 return 0;
1805 * smack_kernel_create_files_as - Set the file creation label in a set of creds
1806 * @new: points to the set of credentials to be modified
1807 * @inode: points to the inode to use as a reference
1809 * Set the file creation context in a set of credentials to the same
1810 * as the objective context of the specified inode
1812 static int smack_kernel_create_files_as(struct cred *new,
1813 struct inode *inode)
1815 struct inode_smack *isp = inode->i_security;
1816 struct task_smack *tsp = new->security;
1818 tsp->smk_forked = isp->smk_inode;
1819 tsp->smk_task = tsp->smk_forked;
1820 return 0;
1824 * smk_curacc_on_task - helper to log task related access
1825 * @p: the task object
1826 * @access: the access requested
1827 * @caller: name of the calling function for audit
1829 * Return 0 if access is permitted
1831 static int smk_curacc_on_task(struct task_struct *p, int access,
1832 const char *caller)
1834 struct smk_audit_info ad;
1835 struct smack_known *skp = smk_of_task_struct(p);
1836 int rc;
1838 smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK);
1839 smk_ad_setfield_u_tsk(&ad, p);
1840 rc = smk_curacc(skp, access, &ad);
1841 rc = smk_bu_task(p, access, rc);
1842 return rc;
1846 * smack_task_setpgid - Smack check on setting pgid
1847 * @p: the task object
1848 * @pgid: unused
1850 * Return 0 if write access is permitted
1852 static int smack_task_setpgid(struct task_struct *p, pid_t pgid)
1854 return smk_curacc_on_task(p, MAY_WRITE, __func__);
1858 * smack_task_getpgid - Smack access check for getpgid
1859 * @p: the object task
1861 * Returns 0 if current can read the object task, error code otherwise
1863 static int smack_task_getpgid(struct task_struct *p)
1865 return smk_curacc_on_task(p, MAY_READ, __func__);
1869 * smack_task_getsid - Smack access check for getsid
1870 * @p: the object task
1872 * Returns 0 if current can read the object task, error code otherwise
1874 static int smack_task_getsid(struct task_struct *p)
1876 return smk_curacc_on_task(p, MAY_READ, __func__);
1880 * smack_task_getsecid - get the secid of the task
1881 * @p: the object task
1882 * @secid: where to put the result
1884 * Sets the secid to contain a u32 version of the smack label.
1886 static void smack_task_getsecid(struct task_struct *p, u32 *secid)
1888 struct smack_known *skp = smk_of_task_struct(p);
1890 *secid = skp->smk_secid;
1894 * smack_task_setnice - Smack check on setting nice
1895 * @p: the task object
1896 * @nice: unused
1898 * Return 0 if write access is permitted
1900 static int smack_task_setnice(struct task_struct *p, int nice)
1902 int rc;
1904 rc = cap_task_setnice(p, nice);
1905 if (rc == 0)
1906 rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
1907 return rc;
1911 * smack_task_setioprio - Smack check on setting ioprio
1912 * @p: the task object
1913 * @ioprio: unused
1915 * Return 0 if write access is permitted
1917 static int smack_task_setioprio(struct task_struct *p, int ioprio)
1919 int rc;
1921 rc = cap_task_setioprio(p, ioprio);
1922 if (rc == 0)
1923 rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
1924 return rc;
1928 * smack_task_getioprio - Smack check on reading ioprio
1929 * @p: the task object
1931 * Return 0 if read access is permitted
1933 static int smack_task_getioprio(struct task_struct *p)
1935 return smk_curacc_on_task(p, MAY_READ, __func__);
1939 * smack_task_setscheduler - Smack check on setting scheduler
1940 * @p: the task object
1941 * @policy: unused
1942 * @lp: unused
1944 * Return 0 if read access is permitted
1946 static int smack_task_setscheduler(struct task_struct *p)
1948 int rc;
1950 rc = cap_task_setscheduler(p);
1951 if (rc == 0)
1952 rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
1953 return rc;
1957 * smack_task_getscheduler - Smack check on reading scheduler
1958 * @p: the task object
1960 * Return 0 if read access is permitted
1962 static int smack_task_getscheduler(struct task_struct *p)
1964 return smk_curacc_on_task(p, MAY_READ, __func__);
1968 * smack_task_movememory - Smack check on moving memory
1969 * @p: the task object
1971 * Return 0 if write access is permitted
1973 static int smack_task_movememory(struct task_struct *p)
1975 return smk_curacc_on_task(p, MAY_WRITE, __func__);
1979 * smack_task_kill - Smack check on signal delivery
1980 * @p: the task object
1981 * @info: unused
1982 * @sig: unused
1983 * @secid: identifies the smack to use in lieu of current's
1985 * Return 0 if write access is permitted
1987 * The secid behavior is an artifact of an SELinux hack
1988 * in the USB code. Someday it may go away.
1990 static int smack_task_kill(struct task_struct *p, struct siginfo *info,
1991 int sig, u32 secid)
1993 struct smk_audit_info ad;
1994 struct smack_known *skp;
1995 struct smack_known *tkp = smk_of_task_struct(p);
1996 int rc;
1998 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1999 smk_ad_setfield_u_tsk(&ad, p);
2001 * Sending a signal requires that the sender
2002 * can write the receiver.
2004 if (secid == 0) {
2005 rc = smk_curacc(tkp, MAY_WRITE, &ad);
2006 rc = smk_bu_task(p, MAY_WRITE, rc);
2007 return rc;
2010 * If the secid isn't 0 we're dealing with some USB IO
2011 * specific behavior. This is not clean. For one thing
2012 * we can't take privilege into account.
2014 skp = smack_from_secid(secid);
2015 rc = smk_access(skp, tkp, MAY_WRITE, &ad);
2016 rc = smk_bu_note("USB signal", skp, tkp, MAY_WRITE, rc);
2017 return rc;
2021 * smack_task_wait - Smack access check for waiting
2022 * @p: task to wait for
2024 * Returns 0
2026 static int smack_task_wait(struct task_struct *p)
2029 * Allow the operation to succeed.
2030 * Zombies are bad.
2031 * In userless environments (e.g. phones) programs
2032 * get marked with SMACK64EXEC and even if the parent
2033 * and child shouldn't be talking the parent still
2034 * may expect to know when the child exits.
2036 return 0;
2040 * smack_task_to_inode - copy task smack into the inode blob
2041 * @p: task to copy from
2042 * @inode: inode to copy to
2044 * Sets the smack pointer in the inode security blob
2046 static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
2048 struct inode_smack *isp = inode->i_security;
2049 struct smack_known *skp = smk_of_task_struct(p);
2051 isp->smk_inode = skp;
2055 * Socket hooks.
2059 * smack_sk_alloc_security - Allocate a socket blob
2060 * @sk: the socket
2061 * @family: unused
2062 * @gfp_flags: memory allocation flags
2064 * Assign Smack pointers to current
2066 * Returns 0 on success, -ENOMEM is there's no memory
2068 static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
2070 struct smack_known *skp = smk_of_current();
2071 struct socket_smack *ssp;
2073 ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
2074 if (ssp == NULL)
2075 return -ENOMEM;
2077 ssp->smk_in = skp;
2078 ssp->smk_out = skp;
2079 ssp->smk_packet = NULL;
2081 sk->sk_security = ssp;
2083 return 0;
2087 * smack_sk_free_security - Free a socket blob
2088 * @sk: the socket
2090 * Clears the blob pointer
2092 static void smack_sk_free_security(struct sock *sk)
2094 kfree(sk->sk_security);
2098 * smack_host_label - check host based restrictions
2099 * @sip: the object end
2101 * looks for host based access restrictions
2103 * This version will only be appropriate for really small sets of single label
2104 * hosts. The caller is responsible for ensuring that the RCU read lock is
2105 * taken before calling this function.
2107 * Returns the label of the far end or NULL if it's not special.
2109 static struct smack_known *smack_host_label(struct sockaddr_in *sip)
2111 struct smk_netlbladdr *snp;
2112 struct in_addr *siap = &sip->sin_addr;
2114 if (siap->s_addr == 0)
2115 return NULL;
2117 list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list)
2119 * we break after finding the first match because
2120 * the list is sorted from longest to shortest mask
2121 * so we have found the most specific match
2123 if ((&snp->smk_host.sin_addr)->s_addr ==
2124 (siap->s_addr & (&snp->smk_mask)->s_addr)) {
2125 /* we have found the special CIPSO option */
2126 if (snp->smk_label == &smack_cipso_option)
2127 return NULL;
2128 return snp->smk_label;
2131 return NULL;
2135 * smack_netlabel - Set the secattr on a socket
2136 * @sk: the socket
2137 * @labeled: socket label scheme
2139 * Convert the outbound smack value (smk_out) to a
2140 * secattr and attach it to the socket.
2142 * Returns 0 on success or an error code
2144 static int smack_netlabel(struct sock *sk, int labeled)
2146 struct smack_known *skp;
2147 struct socket_smack *ssp = sk->sk_security;
2148 int rc = 0;
2151 * Usually the netlabel code will handle changing the
2152 * packet labeling based on the label.
2153 * The case of a single label host is different, because
2154 * a single label host should never get a labeled packet
2155 * even though the label is usually associated with a packet
2156 * label.
2158 local_bh_disable();
2159 bh_lock_sock_nested(sk);
2161 if (ssp->smk_out == smack_net_ambient ||
2162 labeled == SMACK_UNLABELED_SOCKET)
2163 netlbl_sock_delattr(sk);
2164 else {
2165 skp = ssp->smk_out;
2166 rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel);
2169 bh_unlock_sock(sk);
2170 local_bh_enable();
2172 return rc;
2176 * smack_netlbel_send - Set the secattr on a socket and perform access checks
2177 * @sk: the socket
2178 * @sap: the destination address
2180 * Set the correct secattr for the given socket based on the destination
2181 * address and perform any outbound access checks needed.
2183 * Returns 0 on success or an error code.
2186 static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap)
2188 struct smack_known *skp;
2189 int rc;
2190 int sk_lbl;
2191 struct smack_known *hkp;
2192 struct socket_smack *ssp = sk->sk_security;
2193 struct smk_audit_info ad;
2195 rcu_read_lock();
2196 hkp = smack_host_label(sap);
2197 if (hkp != NULL) {
2198 #ifdef CONFIG_AUDIT
2199 struct lsm_network_audit net;
2201 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2202 ad.a.u.net->family = sap->sin_family;
2203 ad.a.u.net->dport = sap->sin_port;
2204 ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr;
2205 #endif
2206 sk_lbl = SMACK_UNLABELED_SOCKET;
2207 skp = ssp->smk_out;
2208 rc = smk_access(skp, hkp, MAY_WRITE, &ad);
2209 rc = smk_bu_note("IPv4 host check", skp, hkp, MAY_WRITE, rc);
2210 } else {
2211 sk_lbl = SMACK_CIPSO_SOCKET;
2212 rc = 0;
2214 rcu_read_unlock();
2215 if (rc != 0)
2216 return rc;
2218 return smack_netlabel(sk, sk_lbl);
2221 #if IS_ENABLED(CONFIG_IPV6) && !defined(CONFIG_SECURITY_SMACK_NETFILTER)
2223 * smk_ipv6_port_label - Smack port access table management
2224 * @sock: socket
2225 * @address: address
2227 * Create or update the port list entry
2229 static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address)
2231 struct sock *sk = sock->sk;
2232 struct sockaddr_in6 *addr6;
2233 struct socket_smack *ssp = sock->sk->sk_security;
2234 struct smk_port_label *spp;
2235 unsigned short port = 0;
2237 if (address == NULL) {
2239 * This operation is changing the Smack information
2240 * on the bound socket. Take the changes to the port
2241 * as well.
2243 list_for_each_entry(spp, &smk_ipv6_port_list, list) {
2244 if (sk != spp->smk_sock)
2245 continue;
2246 spp->smk_in = ssp->smk_in;
2247 spp->smk_out = ssp->smk_out;
2248 return;
2251 * A NULL address is only used for updating existing
2252 * bound entries. If there isn't one, it's OK.
2254 return;
2257 addr6 = (struct sockaddr_in6 *)address;
2258 port = ntohs(addr6->sin6_port);
2260 * This is a special case that is safely ignored.
2262 if (port == 0)
2263 return;
2266 * Look for an existing port list entry.
2267 * This is an indication that a port is getting reused.
2269 list_for_each_entry(spp, &smk_ipv6_port_list, list) {
2270 if (spp->smk_port != port)
2271 continue;
2272 spp->smk_port = port;
2273 spp->smk_sock = sk;
2274 spp->smk_in = ssp->smk_in;
2275 spp->smk_out = ssp->smk_out;
2276 return;
2280 * A new port entry is required.
2282 spp = kzalloc(sizeof(*spp), GFP_KERNEL);
2283 if (spp == NULL)
2284 return;
2286 spp->smk_port = port;
2287 spp->smk_sock = sk;
2288 spp->smk_in = ssp->smk_in;
2289 spp->smk_out = ssp->smk_out;
2291 list_add(&spp->list, &smk_ipv6_port_list);
2292 return;
2296 * smk_ipv6_port_check - check Smack port access
2297 * @sock: socket
2298 * @address: address
2300 * Create or update the port list entry
2302 static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address,
2303 int act)
2305 __be16 *bep;
2306 __be32 *be32p;
2307 struct smk_port_label *spp;
2308 struct socket_smack *ssp = sk->sk_security;
2309 struct smack_known *skp;
2310 unsigned short port = 0;
2311 struct smack_known *object;
2312 struct smk_audit_info ad;
2313 int rc;
2314 #ifdef CONFIG_AUDIT
2315 struct lsm_network_audit net;
2316 #endif
2318 if (act == SMK_RECEIVING) {
2319 skp = smack_net_ambient;
2320 object = ssp->smk_in;
2321 } else {
2322 skp = ssp->smk_out;
2323 object = smack_net_ambient;
2327 * Get the IP address and port from the address.
2329 port = ntohs(address->sin6_port);
2330 bep = (__be16 *)(&address->sin6_addr);
2331 be32p = (__be32 *)(&address->sin6_addr);
2334 * It's remote, so port lookup does no good.
2336 if (be32p[0] || be32p[1] || be32p[2] || bep[6] || ntohs(bep[7]) != 1)
2337 goto auditout;
2340 * It's local so the send check has to have passed.
2342 if (act == SMK_RECEIVING) {
2343 skp = &smack_known_web;
2344 goto auditout;
2347 list_for_each_entry(spp, &smk_ipv6_port_list, list) {
2348 if (spp->smk_port != port)
2349 continue;
2350 object = spp->smk_in;
2351 if (act == SMK_CONNECTING)
2352 ssp->smk_packet = spp->smk_out;
2353 break;
2356 auditout:
2358 #ifdef CONFIG_AUDIT
2359 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2360 ad.a.u.net->family = sk->sk_family;
2361 ad.a.u.net->dport = port;
2362 if (act == SMK_RECEIVING)
2363 ad.a.u.net->v6info.saddr = address->sin6_addr;
2364 else
2365 ad.a.u.net->v6info.daddr = address->sin6_addr;
2366 #endif
2367 rc = smk_access(skp, object, MAY_WRITE, &ad);
2368 rc = smk_bu_note("IPv6 port check", skp, object, MAY_WRITE, rc);
2369 return rc;
2371 #endif /* CONFIG_IPV6 && !CONFIG_SECURITY_SMACK_NETFILTER */
2374 * smack_inode_setsecurity - set smack xattrs
2375 * @inode: the object
2376 * @name: attribute name
2377 * @value: attribute value
2378 * @size: size of the attribute
2379 * @flags: unused
2381 * Sets the named attribute in the appropriate blob
2383 * Returns 0 on success, or an error code
2385 static int smack_inode_setsecurity(struct inode *inode, const char *name,
2386 const void *value, size_t size, int flags)
2388 struct smack_known *skp;
2389 struct inode_smack *nsp = inode->i_security;
2390 struct socket_smack *ssp;
2391 struct socket *sock;
2392 int rc = 0;
2394 if (value == NULL || size > SMK_LONGLABEL || size == 0)
2395 return -EINVAL;
2397 skp = smk_import_entry(value, size);
2398 if (skp == NULL)
2399 return -EINVAL;
2401 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
2402 nsp->smk_inode = skp;
2403 nsp->smk_flags |= SMK_INODE_INSTANT;
2404 return 0;
2407 * The rest of the Smack xattrs are only on sockets.
2409 if (inode->i_sb->s_magic != SOCKFS_MAGIC)
2410 return -EOPNOTSUPP;
2412 sock = SOCKET_I(inode);
2413 if (sock == NULL || sock->sk == NULL)
2414 return -EOPNOTSUPP;
2416 ssp = sock->sk->sk_security;
2418 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
2419 ssp->smk_in = skp;
2420 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) {
2421 ssp->smk_out = skp;
2422 if (sock->sk->sk_family == PF_INET) {
2423 rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
2424 if (rc != 0)
2425 printk(KERN_WARNING
2426 "Smack: \"%s\" netlbl error %d.\n",
2427 __func__, -rc);
2429 } else
2430 return -EOPNOTSUPP;
2432 #if IS_ENABLED(CONFIG_IPV6) && !defined(CONFIG_SECURITY_SMACK_NETFILTER)
2433 if (sock->sk->sk_family == PF_INET6)
2434 smk_ipv6_port_label(sock, NULL);
2435 #endif /* CONFIG_IPV6 && !CONFIG_SECURITY_SMACK_NETFILTER */
2437 return 0;
2441 * smack_socket_post_create - finish socket setup
2442 * @sock: the socket
2443 * @family: protocol family
2444 * @type: unused
2445 * @protocol: unused
2446 * @kern: unused
2448 * Sets the netlabel information on the socket
2450 * Returns 0 on success, and error code otherwise
2452 static int smack_socket_post_create(struct socket *sock, int family,
2453 int type, int protocol, int kern)
2455 if (family != PF_INET || sock->sk == NULL)
2456 return 0;
2458 * Set the outbound netlbl.
2460 return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
2463 #ifndef CONFIG_SECURITY_SMACK_NETFILTER
2465 * smack_socket_bind - record port binding information.
2466 * @sock: the socket
2467 * @address: the port address
2468 * @addrlen: size of the address
2470 * Records the label bound to a port.
2472 * Returns 0
2474 static int smack_socket_bind(struct socket *sock, struct sockaddr *address,
2475 int addrlen)
2477 #if IS_ENABLED(CONFIG_IPV6)
2478 if (sock->sk != NULL && sock->sk->sk_family == PF_INET6)
2479 smk_ipv6_port_label(sock, address);
2480 #endif
2482 return 0;
2484 #endif /* !CONFIG_SECURITY_SMACK_NETFILTER */
2487 * smack_socket_connect - connect access check
2488 * @sock: the socket
2489 * @sap: the other end
2490 * @addrlen: size of sap
2492 * Verifies that a connection may be possible
2494 * Returns 0 on success, and error code otherwise
2496 static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
2497 int addrlen)
2499 int rc = 0;
2501 if (sock->sk == NULL)
2502 return 0;
2504 switch (sock->sk->sk_family) {
2505 case PF_INET:
2506 if (addrlen < sizeof(struct sockaddr_in))
2507 return -EINVAL;
2508 rc = smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap);
2509 break;
2510 case PF_INET6:
2511 if (addrlen < sizeof(struct sockaddr_in6))
2512 return -EINVAL;
2513 #if IS_ENABLED(CONFIG_IPV6) && !defined(CONFIG_SECURITY_SMACK_NETFILTER)
2514 rc = smk_ipv6_port_check(sock->sk, (struct sockaddr_in6 *)sap,
2515 SMK_CONNECTING);
2516 #endif /* CONFIG_IPV6 && !CONFIG_SECURITY_SMACK_NETFILTER */
2517 break;
2519 return rc;
2523 * smack_flags_to_may - convert S_ to MAY_ values
2524 * @flags: the S_ value
2526 * Returns the equivalent MAY_ value
2528 static int smack_flags_to_may(int flags)
2530 int may = 0;
2532 if (flags & S_IRUGO)
2533 may |= MAY_READ;
2534 if (flags & S_IWUGO)
2535 may |= MAY_WRITE;
2536 if (flags & S_IXUGO)
2537 may |= MAY_EXEC;
2539 return may;
2543 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
2544 * @msg: the object
2546 * Returns 0
2548 static int smack_msg_msg_alloc_security(struct msg_msg *msg)
2550 struct smack_known *skp = smk_of_current();
2552 msg->security = skp;
2553 return 0;
2557 * smack_msg_msg_free_security - Clear the security blob for msg_msg
2558 * @msg: the object
2560 * Clears the blob pointer
2562 static void smack_msg_msg_free_security(struct msg_msg *msg)
2564 msg->security = NULL;
2568 * smack_of_shm - the smack pointer for the shm
2569 * @shp: the object
2571 * Returns a pointer to the smack value
2573 static struct smack_known *smack_of_shm(struct shmid_kernel *shp)
2575 return (struct smack_known *)shp->shm_perm.security;
2579 * smack_shm_alloc_security - Set the security blob for shm
2580 * @shp: the object
2582 * Returns 0
2584 static int smack_shm_alloc_security(struct shmid_kernel *shp)
2586 struct kern_ipc_perm *isp = &shp->shm_perm;
2587 struct smack_known *skp = smk_of_current();
2589 isp->security = skp;
2590 return 0;
2594 * smack_shm_free_security - Clear the security blob for shm
2595 * @shp: the object
2597 * Clears the blob pointer
2599 static void smack_shm_free_security(struct shmid_kernel *shp)
2601 struct kern_ipc_perm *isp = &shp->shm_perm;
2603 isp->security = NULL;
2607 * smk_curacc_shm : check if current has access on shm
2608 * @shp : the object
2609 * @access : access requested
2611 * Returns 0 if current has the requested access, error code otherwise
2613 static int smk_curacc_shm(struct shmid_kernel *shp, int access)
2615 struct smack_known *ssp = smack_of_shm(shp);
2616 struct smk_audit_info ad;
2617 int rc;
2619 #ifdef CONFIG_AUDIT
2620 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2621 ad.a.u.ipc_id = shp->shm_perm.id;
2622 #endif
2623 rc = smk_curacc(ssp, access, &ad);
2624 rc = smk_bu_current("shm", ssp, access, rc);
2625 return rc;
2629 * smack_shm_associate - Smack access check for shm
2630 * @shp: the object
2631 * @shmflg: access requested
2633 * Returns 0 if current has the requested access, error code otherwise
2635 static int smack_shm_associate(struct shmid_kernel *shp, int shmflg)
2637 int may;
2639 may = smack_flags_to_may(shmflg);
2640 return smk_curacc_shm(shp, may);
2644 * smack_shm_shmctl - Smack access check for shm
2645 * @shp: the object
2646 * @cmd: what it wants to do
2648 * Returns 0 if current has the requested access, error code otherwise
2650 static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd)
2652 int may;
2654 switch (cmd) {
2655 case IPC_STAT:
2656 case SHM_STAT:
2657 may = MAY_READ;
2658 break;
2659 case IPC_SET:
2660 case SHM_LOCK:
2661 case SHM_UNLOCK:
2662 case IPC_RMID:
2663 may = MAY_READWRITE;
2664 break;
2665 case IPC_INFO:
2666 case SHM_INFO:
2668 * System level information.
2670 return 0;
2671 default:
2672 return -EINVAL;
2674 return smk_curacc_shm(shp, may);
2678 * smack_shm_shmat - Smack access for shmat
2679 * @shp: the object
2680 * @shmaddr: unused
2681 * @shmflg: access requested
2683 * Returns 0 if current has the requested access, error code otherwise
2685 static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr,
2686 int shmflg)
2688 int may;
2690 may = smack_flags_to_may(shmflg);
2691 return smk_curacc_shm(shp, may);
2695 * smack_of_sem - the smack pointer for the sem
2696 * @sma: the object
2698 * Returns a pointer to the smack value
2700 static struct smack_known *smack_of_sem(struct sem_array *sma)
2702 return (struct smack_known *)sma->sem_perm.security;
2706 * smack_sem_alloc_security - Set the security blob for sem
2707 * @sma: the object
2709 * Returns 0
2711 static int smack_sem_alloc_security(struct sem_array *sma)
2713 struct kern_ipc_perm *isp = &sma->sem_perm;
2714 struct smack_known *skp = smk_of_current();
2716 isp->security = skp;
2717 return 0;
2721 * smack_sem_free_security - Clear the security blob for sem
2722 * @sma: the object
2724 * Clears the blob pointer
2726 static void smack_sem_free_security(struct sem_array *sma)
2728 struct kern_ipc_perm *isp = &sma->sem_perm;
2730 isp->security = NULL;
2734 * smk_curacc_sem : check if current has access on sem
2735 * @sma : the object
2736 * @access : access requested
2738 * Returns 0 if current has the requested access, error code otherwise
2740 static int smk_curacc_sem(struct sem_array *sma, int access)
2742 struct smack_known *ssp = smack_of_sem(sma);
2743 struct smk_audit_info ad;
2744 int rc;
2746 #ifdef CONFIG_AUDIT
2747 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2748 ad.a.u.ipc_id = sma->sem_perm.id;
2749 #endif
2750 rc = smk_curacc(ssp, access, &ad);
2751 rc = smk_bu_current("sem", ssp, access, rc);
2752 return rc;
2756 * smack_sem_associate - Smack access check for sem
2757 * @sma: the object
2758 * @semflg: access requested
2760 * Returns 0 if current has the requested access, error code otherwise
2762 static int smack_sem_associate(struct sem_array *sma, int semflg)
2764 int may;
2766 may = smack_flags_to_may(semflg);
2767 return smk_curacc_sem(sma, may);
2771 * smack_sem_shmctl - Smack access check for sem
2772 * @sma: the object
2773 * @cmd: what it wants to do
2775 * Returns 0 if current has the requested access, error code otherwise
2777 static int smack_sem_semctl(struct sem_array *sma, int cmd)
2779 int may;
2781 switch (cmd) {
2782 case GETPID:
2783 case GETNCNT:
2784 case GETZCNT:
2785 case GETVAL:
2786 case GETALL:
2787 case IPC_STAT:
2788 case SEM_STAT:
2789 may = MAY_READ;
2790 break;
2791 case SETVAL:
2792 case SETALL:
2793 case IPC_RMID:
2794 case IPC_SET:
2795 may = MAY_READWRITE;
2796 break;
2797 case IPC_INFO:
2798 case SEM_INFO:
2800 * System level information
2802 return 0;
2803 default:
2804 return -EINVAL;
2807 return smk_curacc_sem(sma, may);
2811 * smack_sem_semop - Smack checks of semaphore operations
2812 * @sma: the object
2813 * @sops: unused
2814 * @nsops: unused
2815 * @alter: unused
2817 * Treated as read and write in all cases.
2819 * Returns 0 if access is allowed, error code otherwise
2821 static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops,
2822 unsigned nsops, int alter)
2824 return smk_curacc_sem(sma, MAY_READWRITE);
2828 * smack_msg_alloc_security - Set the security blob for msg
2829 * @msq: the object
2831 * Returns 0
2833 static int smack_msg_queue_alloc_security(struct msg_queue *msq)
2835 struct kern_ipc_perm *kisp = &msq->q_perm;
2836 struct smack_known *skp = smk_of_current();
2838 kisp->security = skp;
2839 return 0;
2843 * smack_msg_free_security - Clear the security blob for msg
2844 * @msq: the object
2846 * Clears the blob pointer
2848 static void smack_msg_queue_free_security(struct msg_queue *msq)
2850 struct kern_ipc_perm *kisp = &msq->q_perm;
2852 kisp->security = NULL;
2856 * smack_of_msq - the smack pointer for the msq
2857 * @msq: the object
2859 * Returns a pointer to the smack label entry
2861 static struct smack_known *smack_of_msq(struct msg_queue *msq)
2863 return (struct smack_known *)msq->q_perm.security;
2867 * smk_curacc_msq : helper to check if current has access on msq
2868 * @msq : the msq
2869 * @access : access requested
2871 * return 0 if current has access, error otherwise
2873 static int smk_curacc_msq(struct msg_queue *msq, int access)
2875 struct smack_known *msp = smack_of_msq(msq);
2876 struct smk_audit_info ad;
2877 int rc;
2879 #ifdef CONFIG_AUDIT
2880 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2881 ad.a.u.ipc_id = msq->q_perm.id;
2882 #endif
2883 rc = smk_curacc(msp, access, &ad);
2884 rc = smk_bu_current("msq", msp, access, rc);
2885 return rc;
2889 * smack_msg_queue_associate - Smack access check for msg_queue
2890 * @msq: the object
2891 * @msqflg: access requested
2893 * Returns 0 if current has the requested access, error code otherwise
2895 static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg)
2897 int may;
2899 may = smack_flags_to_may(msqflg);
2900 return smk_curacc_msq(msq, may);
2904 * smack_msg_queue_msgctl - Smack access check for msg_queue
2905 * @msq: the object
2906 * @cmd: what it wants to do
2908 * Returns 0 if current has the requested access, error code otherwise
2910 static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd)
2912 int may;
2914 switch (cmd) {
2915 case IPC_STAT:
2916 case MSG_STAT:
2917 may = MAY_READ;
2918 break;
2919 case IPC_SET:
2920 case IPC_RMID:
2921 may = MAY_READWRITE;
2922 break;
2923 case IPC_INFO:
2924 case MSG_INFO:
2926 * System level information
2928 return 0;
2929 default:
2930 return -EINVAL;
2933 return smk_curacc_msq(msq, may);
2937 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2938 * @msq: the object
2939 * @msg: unused
2940 * @msqflg: access requested
2942 * Returns 0 if current has the requested access, error code otherwise
2944 static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg,
2945 int msqflg)
2947 int may;
2949 may = smack_flags_to_may(msqflg);
2950 return smk_curacc_msq(msq, may);
2954 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2955 * @msq: the object
2956 * @msg: unused
2957 * @target: unused
2958 * @type: unused
2959 * @mode: unused
2961 * Returns 0 if current has read and write access, error code otherwise
2963 static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
2964 struct task_struct *target, long type, int mode)
2966 return smk_curacc_msq(msq, MAY_READWRITE);
2970 * smack_ipc_permission - Smack access for ipc_permission()
2971 * @ipp: the object permissions
2972 * @flag: access requested
2974 * Returns 0 if current has read and write access, error code otherwise
2976 static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
2978 struct smack_known *iskp = ipp->security;
2979 int may = smack_flags_to_may(flag);
2980 struct smk_audit_info ad;
2981 int rc;
2983 #ifdef CONFIG_AUDIT
2984 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2985 ad.a.u.ipc_id = ipp->id;
2986 #endif
2987 rc = smk_curacc(iskp, may, &ad);
2988 rc = smk_bu_current("svipc", iskp, may, rc);
2989 return rc;
2993 * smack_ipc_getsecid - Extract smack security id
2994 * @ipp: the object permissions
2995 * @secid: where result will be saved
2997 static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid)
2999 struct smack_known *iskp = ipp->security;
3001 *secid = iskp->smk_secid;
3005 * smack_d_instantiate - Make sure the blob is correct on an inode
3006 * @opt_dentry: dentry where inode will be attached
3007 * @inode: the object
3009 * Set the inode's security blob if it hasn't been done already.
3011 static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
3013 struct super_block *sbp;
3014 struct superblock_smack *sbsp;
3015 struct inode_smack *isp;
3016 struct smack_known *skp;
3017 struct smack_known *ckp = smk_of_current();
3018 struct smack_known *final;
3019 char trattr[TRANS_TRUE_SIZE];
3020 int transflag = 0;
3021 int rc;
3022 struct dentry *dp;
3024 if (inode == NULL)
3025 return;
3027 isp = inode->i_security;
3029 mutex_lock(&isp->smk_lock);
3031 * If the inode is already instantiated
3032 * take the quick way out
3034 if (isp->smk_flags & SMK_INODE_INSTANT)
3035 goto unlockandout;
3037 sbp = inode->i_sb;
3038 sbsp = sbp->s_security;
3040 * We're going to use the superblock default label
3041 * if there's no label on the file.
3043 final = sbsp->smk_default;
3046 * If this is the root inode the superblock
3047 * may be in the process of initialization.
3048 * If that is the case use the root value out
3049 * of the superblock.
3051 if (opt_dentry->d_parent == opt_dentry) {
3052 switch (sbp->s_magic) {
3053 case CGROUP_SUPER_MAGIC:
3055 * The cgroup filesystem is never mounted,
3056 * so there's no opportunity to set the mount
3057 * options.
3059 sbsp->smk_root = &smack_known_star;
3060 sbsp->smk_default = &smack_known_star;
3061 isp->smk_inode = sbsp->smk_root;
3062 break;
3063 case TMPFS_MAGIC:
3065 * What about shmem/tmpfs anonymous files with dentry
3066 * obtained from d_alloc_pseudo()?
3068 isp->smk_inode = smk_of_current();
3069 break;
3070 default:
3071 isp->smk_inode = sbsp->smk_root;
3072 break;
3074 isp->smk_flags |= SMK_INODE_INSTANT;
3075 goto unlockandout;
3079 * This is pretty hackish.
3080 * Casey says that we shouldn't have to do
3081 * file system specific code, but it does help
3082 * with keeping it simple.
3084 switch (sbp->s_magic) {
3085 case SMACK_MAGIC:
3086 case PIPEFS_MAGIC:
3087 case SOCKFS_MAGIC:
3088 case CGROUP_SUPER_MAGIC:
3090 * Casey says that it's a little embarrassing
3091 * that the smack file system doesn't do
3092 * extended attributes.
3094 * Casey says pipes are easy (?)
3096 * Socket access is controlled by the socket
3097 * structures associated with the task involved.
3099 * Cgroupfs is special
3101 final = &smack_known_star;
3102 break;
3103 case DEVPTS_SUPER_MAGIC:
3105 * devpts seems content with the label of the task.
3106 * Programs that change smack have to treat the
3107 * pty with respect.
3109 final = ckp;
3110 break;
3111 case PROC_SUPER_MAGIC:
3113 * Casey says procfs appears not to care.
3114 * The superblock default suffices.
3116 break;
3117 case TMPFS_MAGIC:
3119 * Device labels should come from the filesystem,
3120 * but watch out, because they're volitile,
3121 * getting recreated on every reboot.
3123 final = &smack_known_star;
3125 * No break.
3127 * If a smack value has been set we want to use it,
3128 * but since tmpfs isn't giving us the opportunity
3129 * to set mount options simulate setting the
3130 * superblock default.
3132 default:
3134 * This isn't an understood special case.
3135 * Get the value from the xattr.
3139 * UNIX domain sockets use lower level socket data.
3141 if (S_ISSOCK(inode->i_mode)) {
3142 final = &smack_known_star;
3143 break;
3146 * No xattr support means, alas, no SMACK label.
3147 * Use the aforeapplied default.
3148 * It would be curious if the label of the task
3149 * does not match that assigned.
3151 if (inode->i_op->getxattr == NULL)
3152 break;
3154 * Get the dentry for xattr.
3156 dp = dget(opt_dentry);
3157 skp = smk_fetch(XATTR_NAME_SMACK, inode, dp);
3158 if (skp != NULL)
3159 final = skp;
3162 * Transmuting directory
3164 if (S_ISDIR(inode->i_mode)) {
3166 * If this is a new directory and the label was
3167 * transmuted when the inode was initialized
3168 * set the transmute attribute on the directory
3169 * and mark the inode.
3171 * If there is a transmute attribute on the
3172 * directory mark the inode.
3174 if (isp->smk_flags & SMK_INODE_CHANGED) {
3175 isp->smk_flags &= ~SMK_INODE_CHANGED;
3176 rc = inode->i_op->setxattr(dp,
3177 XATTR_NAME_SMACKTRANSMUTE,
3178 TRANS_TRUE, TRANS_TRUE_SIZE,
3180 } else {
3181 rc = inode->i_op->getxattr(dp,
3182 XATTR_NAME_SMACKTRANSMUTE, trattr,
3183 TRANS_TRUE_SIZE);
3184 if (rc >= 0 && strncmp(trattr, TRANS_TRUE,
3185 TRANS_TRUE_SIZE) != 0)
3186 rc = -EINVAL;
3188 if (rc >= 0)
3189 transflag = SMK_INODE_TRANSMUTE;
3192 * Don't let the exec or mmap label be "*" or "@".
3194 skp = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp);
3195 if (skp == &smack_known_star || skp == &smack_known_web)
3196 skp = NULL;
3197 isp->smk_task = skp;
3198 skp = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp);
3199 if (skp == &smack_known_star || skp == &smack_known_web)
3200 skp = NULL;
3201 isp->smk_mmap = skp;
3203 dput(dp);
3204 break;
3207 if (final == NULL)
3208 isp->smk_inode = ckp;
3209 else
3210 isp->smk_inode = final;
3212 isp->smk_flags |= (SMK_INODE_INSTANT | transflag);
3214 unlockandout:
3215 mutex_unlock(&isp->smk_lock);
3216 return;
3220 * smack_getprocattr - Smack process attribute access
3221 * @p: the object task
3222 * @name: the name of the attribute in /proc/.../attr
3223 * @value: where to put the result
3225 * Places a copy of the task Smack into value
3227 * Returns the length of the smack label or an error code
3229 static int smack_getprocattr(struct task_struct *p, char *name, char **value)
3231 struct smack_known *skp = smk_of_task_struct(p);
3232 char *cp;
3233 int slen;
3235 if (strcmp(name, "current") != 0)
3236 return -EINVAL;
3238 cp = kstrdup(skp->smk_known, GFP_KERNEL);
3239 if (cp == NULL)
3240 return -ENOMEM;
3242 slen = strlen(cp);
3243 *value = cp;
3244 return slen;
3248 * smack_setprocattr - Smack process attribute setting
3249 * @p: the object task
3250 * @name: the name of the attribute in /proc/.../attr
3251 * @value: the value to set
3252 * @size: the size of the value
3254 * Sets the Smack value of the task. Only setting self
3255 * is permitted and only with privilege
3257 * Returns the length of the smack label or an error code
3259 static int smack_setprocattr(struct task_struct *p, char *name,
3260 void *value, size_t size)
3262 struct task_smack *tsp;
3263 struct cred *new;
3264 struct smack_known *skp;
3267 * Changing another process' Smack value is too dangerous
3268 * and supports no sane use case.
3270 if (p != current)
3271 return -EPERM;
3273 if (!smack_privileged(CAP_MAC_ADMIN))
3274 return -EPERM;
3276 if (value == NULL || size == 0 || size >= SMK_LONGLABEL)
3277 return -EINVAL;
3279 if (strcmp(name, "current") != 0)
3280 return -EINVAL;
3282 skp = smk_import_entry(value, size);
3283 if (skp == NULL)
3284 return -EINVAL;
3287 * No process is ever allowed the web ("@") label.
3289 if (skp == &smack_known_web)
3290 return -EPERM;
3292 new = prepare_creds();
3293 if (new == NULL)
3294 return -ENOMEM;
3296 tsp = new->security;
3297 tsp->smk_task = skp;
3299 commit_creds(new);
3300 return size;
3304 * smack_unix_stream_connect - Smack access on UDS
3305 * @sock: one sock
3306 * @other: the other sock
3307 * @newsk: unused
3309 * Return 0 if a subject with the smack of sock could access
3310 * an object with the smack of other, otherwise an error code
3312 static int smack_unix_stream_connect(struct sock *sock,
3313 struct sock *other, struct sock *newsk)
3315 struct smack_known *skp;
3316 struct smack_known *okp;
3317 struct socket_smack *ssp = sock->sk_security;
3318 struct socket_smack *osp = other->sk_security;
3319 struct socket_smack *nsp = newsk->sk_security;
3320 struct smk_audit_info ad;
3321 int rc = 0;
3322 #ifdef CONFIG_AUDIT
3323 struct lsm_network_audit net;
3324 #endif
3326 if (!smack_privileged(CAP_MAC_OVERRIDE)) {
3327 skp = ssp->smk_out;
3328 okp = osp->smk_in;
3329 #ifdef CONFIG_AUDIT
3330 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3331 smk_ad_setfield_u_net_sk(&ad, other);
3332 #endif
3333 rc = smk_access(skp, okp, MAY_WRITE, &ad);
3334 rc = smk_bu_note("UDS connect", skp, okp, MAY_WRITE, rc);
3335 if (rc == 0) {
3336 okp = osp->smk_out;
3337 skp = ssp->smk_in;
3338 rc = smk_access(okp, skp, MAY_WRITE, &ad);
3339 rc = smk_bu_note("UDS connect", okp, skp,
3340 MAY_WRITE, rc);
3345 * Cross reference the peer labels for SO_PEERSEC.
3347 if (rc == 0) {
3348 nsp->smk_packet = ssp->smk_out;
3349 ssp->smk_packet = osp->smk_out;
3352 return rc;
3356 * smack_unix_may_send - Smack access on UDS
3357 * @sock: one socket
3358 * @other: the other socket
3360 * Return 0 if a subject with the smack of sock could access
3361 * an object with the smack of other, otherwise an error code
3363 static int smack_unix_may_send(struct socket *sock, struct socket *other)
3365 struct socket_smack *ssp = sock->sk->sk_security;
3366 struct socket_smack *osp = other->sk->sk_security;
3367 struct smk_audit_info ad;
3368 int rc;
3370 #ifdef CONFIG_AUDIT
3371 struct lsm_network_audit net;
3373 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3374 smk_ad_setfield_u_net_sk(&ad, other->sk);
3375 #endif
3377 if (smack_privileged(CAP_MAC_OVERRIDE))
3378 return 0;
3380 rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad);
3381 rc = smk_bu_note("UDS send", ssp->smk_out, osp->smk_in, MAY_WRITE, rc);
3382 return rc;
3386 * smack_socket_sendmsg - Smack check based on destination host
3387 * @sock: the socket
3388 * @msg: the message
3389 * @size: the size of the message
3391 * Return 0 if the current subject can write to the destination host.
3392 * For IPv4 this is only a question if the destination is a single label host.
3393 * For IPv6 this is a check against the label of the port.
3395 static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
3396 int size)
3398 struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name;
3399 #if IS_ENABLED(CONFIG_IPV6) && !defined(CONFIG_SECURITY_SMACK_NETFILTER)
3400 struct sockaddr_in6 *sap = (struct sockaddr_in6 *) msg->msg_name;
3401 #endif /* CONFIG_IPV6 && !CONFIG_SECURITY_SMACK_NETFILTER */
3402 int rc = 0;
3405 * Perfectly reasonable for this to be NULL
3407 if (sip == NULL)
3408 return 0;
3410 switch (sip->sin_family) {
3411 case AF_INET:
3412 rc = smack_netlabel_send(sock->sk, sip);
3413 break;
3414 case AF_INET6:
3415 #if IS_ENABLED(CONFIG_IPV6) && !defined(CONFIG_SECURITY_SMACK_NETFILTER)
3416 rc = smk_ipv6_port_check(sock->sk, sap, SMK_SENDING);
3417 #endif /* CONFIG_IPV6 && !CONFIG_SECURITY_SMACK_NETFILTER */
3418 break;
3420 return rc;
3424 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
3425 * @sap: netlabel secattr
3426 * @ssp: socket security information
3428 * Returns a pointer to a Smack label entry found on the label list.
3430 static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap,
3431 struct socket_smack *ssp)
3433 struct smack_known *skp;
3434 int found = 0;
3435 int acat;
3436 int kcat;
3438 if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) {
3440 * Looks like a CIPSO packet.
3441 * If there are flags but no level netlabel isn't
3442 * behaving the way we expect it to.
3444 * Look it up in the label table
3445 * Without guidance regarding the smack value
3446 * for the packet fall back on the network
3447 * ambient value.
3449 rcu_read_lock();
3450 list_for_each_entry(skp, &smack_known_list, list) {
3451 if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl)
3452 continue;
3454 * Compare the catsets. Use the netlbl APIs.
3456 if ((sap->flags & NETLBL_SECATTR_MLS_CAT) == 0) {
3457 if ((skp->smk_netlabel.flags &
3458 NETLBL_SECATTR_MLS_CAT) == 0)
3459 found = 1;
3460 break;
3462 for (acat = -1, kcat = -1; acat == kcat; ) {
3463 acat = netlbl_catmap_walk(sap->attr.mls.cat,
3464 acat + 1);
3465 kcat = netlbl_catmap_walk(
3466 skp->smk_netlabel.attr.mls.cat,
3467 kcat + 1);
3468 if (acat < 0 || kcat < 0)
3469 break;
3471 if (acat == kcat) {
3472 found = 1;
3473 break;
3476 rcu_read_unlock();
3478 if (found)
3479 return skp;
3481 if (ssp != NULL && ssp->smk_in == &smack_known_star)
3482 return &smack_known_web;
3483 return &smack_known_star;
3485 if ((sap->flags & NETLBL_SECATTR_SECID) != 0) {
3487 * Looks like a fallback, which gives us a secid.
3489 skp = smack_from_secid(sap->attr.secid);
3491 * This has got to be a bug because it is
3492 * impossible to specify a fallback without
3493 * specifying the label, which will ensure
3494 * it has a secid, and the only way to get a
3495 * secid is from a fallback.
3497 BUG_ON(skp == NULL);
3498 return skp;
3501 * Without guidance regarding the smack value
3502 * for the packet fall back on the network
3503 * ambient value.
3505 return smack_net_ambient;
3508 #if IS_ENABLED(CONFIG_IPV6)
3509 static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr_in6 *sip)
3511 u8 nexthdr;
3512 int offset;
3513 int proto = -EINVAL;
3514 struct ipv6hdr _ipv6h;
3515 struct ipv6hdr *ip6;
3516 __be16 frag_off;
3517 struct tcphdr _tcph, *th;
3518 struct udphdr _udph, *uh;
3519 struct dccp_hdr _dccph, *dh;
3521 sip->sin6_port = 0;
3523 offset = skb_network_offset(skb);
3524 ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h);
3525 if (ip6 == NULL)
3526 return -EINVAL;
3527 sip->sin6_addr = ip6->saddr;
3529 nexthdr = ip6->nexthdr;
3530 offset += sizeof(_ipv6h);
3531 offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
3532 if (offset < 0)
3533 return -EINVAL;
3535 proto = nexthdr;
3536 switch (proto) {
3537 case IPPROTO_TCP:
3538 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
3539 if (th != NULL)
3540 sip->sin6_port = th->source;
3541 break;
3542 case IPPROTO_UDP:
3543 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
3544 if (uh != NULL)
3545 sip->sin6_port = uh->source;
3546 break;
3547 case IPPROTO_DCCP:
3548 dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
3549 if (dh != NULL)
3550 sip->sin6_port = dh->dccph_sport;
3551 break;
3553 return proto;
3555 #endif /* CONFIG_IPV6 */
3558 * smack_socket_sock_rcv_skb - Smack packet delivery access check
3559 * @sk: socket
3560 * @skb: packet
3562 * Returns 0 if the packet should be delivered, an error code otherwise
3564 static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
3566 struct netlbl_lsm_secattr secattr;
3567 struct socket_smack *ssp = sk->sk_security;
3568 struct smack_known *skp = NULL;
3569 int rc = 0;
3570 struct smk_audit_info ad;
3571 #ifdef CONFIG_AUDIT
3572 struct lsm_network_audit net;
3573 #endif
3574 #if IS_ENABLED(CONFIG_IPV6)
3575 struct sockaddr_in6 sadd;
3576 int proto;
3577 #endif /* CONFIG_IPV6 */
3579 switch (sk->sk_family) {
3580 case PF_INET:
3581 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
3583 * If there is a secmark use it rather than the CIPSO label.
3584 * If there is no secmark fall back to CIPSO.
3585 * The secmark is assumed to reflect policy better.
3587 if (skb && skb->secmark != 0) {
3588 skp = smack_from_secid(skb->secmark);
3589 goto access_check;
3591 #endif /* CONFIG_SECURITY_SMACK_NETFILTER */
3593 * Translate what netlabel gave us.
3595 netlbl_secattr_init(&secattr);
3597 rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr);
3598 if (rc == 0)
3599 skp = smack_from_secattr(&secattr, ssp);
3600 else
3601 skp = smack_net_ambient;
3603 netlbl_secattr_destroy(&secattr);
3605 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
3606 access_check:
3607 #endif
3608 #ifdef CONFIG_AUDIT
3609 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3610 ad.a.u.net->family = sk->sk_family;
3611 ad.a.u.net->netif = skb->skb_iif;
3612 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
3613 #endif
3615 * Receiving a packet requires that the other end
3616 * be able to write here. Read access is not required.
3617 * This is the simplist possible security model
3618 * for networking.
3620 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
3621 rc = smk_bu_note("IPv4 delivery", skp, ssp->smk_in,
3622 MAY_WRITE, rc);
3623 if (rc != 0)
3624 netlbl_skbuff_err(skb, rc, 0);
3625 break;
3626 #if IS_ENABLED(CONFIG_IPV6)
3627 case PF_INET6:
3628 proto = smk_skb_to_addr_ipv6(skb, &sadd);
3629 if (proto != IPPROTO_UDP && proto != IPPROTO_TCP)
3630 break;
3631 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
3632 if (skb && skb->secmark != 0)
3633 skp = smack_from_secid(skb->secmark);
3634 else
3635 skp = smack_net_ambient;
3636 #ifdef CONFIG_AUDIT
3637 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3638 ad.a.u.net->family = sk->sk_family;
3639 ad.a.u.net->netif = skb->skb_iif;
3640 ipv6_skb_to_auditdata(skb, &ad.a, NULL);
3641 #endif /* CONFIG_AUDIT */
3642 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
3643 rc = smk_bu_note("IPv6 delivery", skp, ssp->smk_in,
3644 MAY_WRITE, rc);
3645 #else /* CONFIG_SECURITY_SMACK_NETFILTER */
3646 rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING);
3647 #endif /* CONFIG_SECURITY_SMACK_NETFILTER */
3648 break;
3649 #endif /* CONFIG_IPV6 */
3652 return rc;
3656 * smack_socket_getpeersec_stream - pull in packet label
3657 * @sock: the socket
3658 * @optval: user's destination
3659 * @optlen: size thereof
3660 * @len: max thereof
3662 * returns zero on success, an error code otherwise
3664 static int smack_socket_getpeersec_stream(struct socket *sock,
3665 char __user *optval,
3666 int __user *optlen, unsigned len)
3668 struct socket_smack *ssp;
3669 char *rcp = "";
3670 int slen = 1;
3671 int rc = 0;
3673 ssp = sock->sk->sk_security;
3674 if (ssp->smk_packet != NULL) {
3675 rcp = ssp->smk_packet->smk_known;
3676 slen = strlen(rcp) + 1;
3679 if (slen > len)
3680 rc = -ERANGE;
3681 else if (copy_to_user(optval, rcp, slen) != 0)
3682 rc = -EFAULT;
3684 if (put_user(slen, optlen) != 0)
3685 rc = -EFAULT;
3687 return rc;
3692 * smack_socket_getpeersec_dgram - pull in packet label
3693 * @sock: the peer socket
3694 * @skb: packet data
3695 * @secid: pointer to where to put the secid of the packet
3697 * Sets the netlabel socket state on sk from parent
3699 static int smack_socket_getpeersec_dgram(struct socket *sock,
3700 struct sk_buff *skb, u32 *secid)
3703 struct netlbl_lsm_secattr secattr;
3704 struct socket_smack *ssp = NULL;
3705 struct smack_known *skp;
3706 int family = PF_UNSPEC;
3707 u32 s = 0; /* 0 is the invalid secid */
3708 int rc;
3710 if (skb != NULL) {
3711 if (skb->protocol == htons(ETH_P_IP))
3712 family = PF_INET;
3713 #if IS_ENABLED(CONFIG_IPV6)
3714 else if (skb->protocol == htons(ETH_P_IPV6))
3715 family = PF_INET6;
3716 #endif /* CONFIG_IPV6 */
3718 if (family == PF_UNSPEC && sock != NULL)
3719 family = sock->sk->sk_family;
3721 switch (family) {
3722 case PF_UNIX:
3723 ssp = sock->sk->sk_security;
3724 s = ssp->smk_out->smk_secid;
3725 break;
3726 case PF_INET:
3727 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
3728 s = skb->secmark;
3729 if (s != 0)
3730 break;
3731 #endif
3733 * Translate what netlabel gave us.
3735 if (sock != NULL && sock->sk != NULL)
3736 ssp = sock->sk->sk_security;
3737 netlbl_secattr_init(&secattr);
3738 rc = netlbl_skbuff_getattr(skb, family, &secattr);
3739 if (rc == 0) {
3740 skp = smack_from_secattr(&secattr, ssp);
3741 s = skp->smk_secid;
3743 netlbl_secattr_destroy(&secattr);
3744 break;
3745 #if IS_ENABLED(CONFIG_IPV6)
3746 case PF_INET6:
3747 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
3748 s = skb->secmark;
3749 #endif /* CONFIG_SECURITY_SMACK_NETFILTER */
3750 break;
3751 #endif /* CONFIG_IPV6 */
3753 *secid = s;
3754 if (s == 0)
3755 return -EINVAL;
3756 return 0;
3760 * smack_sock_graft - Initialize a newly created socket with an existing sock
3761 * @sk: child sock
3762 * @parent: parent socket
3764 * Set the smk_{in,out} state of an existing sock based on the process that
3765 * is creating the new socket.
3767 static void smack_sock_graft(struct sock *sk, struct socket *parent)
3769 struct socket_smack *ssp;
3770 struct smack_known *skp = smk_of_current();
3772 if (sk == NULL ||
3773 (sk->sk_family != PF_INET && sk->sk_family != PF_INET6))
3774 return;
3776 ssp = sk->sk_security;
3777 ssp->smk_in = skp;
3778 ssp->smk_out = skp;
3779 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
3783 * smack_inet_conn_request - Smack access check on connect
3784 * @sk: socket involved
3785 * @skb: packet
3786 * @req: unused
3788 * Returns 0 if a task with the packet label could write to
3789 * the socket, otherwise an error code
3791 static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
3792 struct request_sock *req)
3794 u16 family = sk->sk_family;
3795 struct smack_known *skp;
3796 struct socket_smack *ssp = sk->sk_security;
3797 struct netlbl_lsm_secattr secattr;
3798 struct sockaddr_in addr;
3799 struct iphdr *hdr;
3800 struct smack_known *hskp;
3801 int rc;
3802 struct smk_audit_info ad;
3803 #ifdef CONFIG_AUDIT
3804 struct lsm_network_audit net;
3805 #endif
3807 #if IS_ENABLED(CONFIG_IPV6)
3808 if (family == PF_INET6) {
3810 * Handle mapped IPv4 packets arriving
3811 * via IPv6 sockets. Don't set up netlabel
3812 * processing on IPv6.
3814 if (skb->protocol == htons(ETH_P_IP))
3815 family = PF_INET;
3816 else
3817 return 0;
3819 #endif /* CONFIG_IPV6 */
3821 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
3823 * If there is a secmark use it rather than the CIPSO label.
3824 * If there is no secmark fall back to CIPSO.
3825 * The secmark is assumed to reflect policy better.
3827 if (skb && skb->secmark != 0) {
3828 skp = smack_from_secid(skb->secmark);
3829 goto access_check;
3831 #endif /* CONFIG_SECURITY_SMACK_NETFILTER */
3833 netlbl_secattr_init(&secattr);
3834 rc = netlbl_skbuff_getattr(skb, family, &secattr);
3835 if (rc == 0)
3836 skp = smack_from_secattr(&secattr, ssp);
3837 else
3838 skp = &smack_known_huh;
3839 netlbl_secattr_destroy(&secattr);
3841 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
3842 access_check:
3843 #endif
3845 #ifdef CONFIG_AUDIT
3846 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3847 ad.a.u.net->family = family;
3848 ad.a.u.net->netif = skb->skb_iif;
3849 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
3850 #endif
3852 * Receiving a packet requires that the other end be able to write
3853 * here. Read access is not required.
3855 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
3856 rc = smk_bu_note("IPv4 connect", skp, ssp->smk_in, MAY_WRITE, rc);
3857 if (rc != 0)
3858 return rc;
3861 * Save the peer's label in the request_sock so we can later setup
3862 * smk_packet in the child socket so that SO_PEERCRED can report it.
3864 req->peer_secid = skp->smk_secid;
3867 * We need to decide if we want to label the incoming connection here
3868 * if we do we only need to label the request_sock and the stack will
3869 * propagate the wire-label to the sock when it is created.
3871 hdr = ip_hdr(skb);
3872 addr.sin_addr.s_addr = hdr->saddr;
3873 rcu_read_lock();
3874 hskp = smack_host_label(&addr);
3875 rcu_read_unlock();
3877 if (hskp == NULL)
3878 rc = netlbl_req_setattr(req, &skp->smk_netlabel);
3879 else
3880 netlbl_req_delattr(req);
3882 return rc;
3886 * smack_inet_csk_clone - Copy the connection information to the new socket
3887 * @sk: the new socket
3888 * @req: the connection's request_sock
3890 * Transfer the connection's peer label to the newly created socket.
3892 static void smack_inet_csk_clone(struct sock *sk,
3893 const struct request_sock *req)
3895 struct socket_smack *ssp = sk->sk_security;
3896 struct smack_known *skp;
3898 if (req->peer_secid != 0) {
3899 skp = smack_from_secid(req->peer_secid);
3900 ssp->smk_packet = skp;
3901 } else
3902 ssp->smk_packet = NULL;
3906 * Key management security hooks
3908 * Casey has not tested key support very heavily.
3909 * The permission check is most likely too restrictive.
3910 * If you care about keys please have a look.
3912 #ifdef CONFIG_KEYS
3915 * smack_key_alloc - Set the key security blob
3916 * @key: object
3917 * @cred: the credentials to use
3918 * @flags: unused
3920 * No allocation required
3922 * Returns 0
3924 static int smack_key_alloc(struct key *key, const struct cred *cred,
3925 unsigned long flags)
3927 struct smack_known *skp = smk_of_task(cred->security);
3929 key->security = skp;
3930 return 0;
3934 * smack_key_free - Clear the key security blob
3935 * @key: the object
3937 * Clear the blob pointer
3939 static void smack_key_free(struct key *key)
3941 key->security = NULL;
3945 * smack_key_permission - Smack access on a key
3946 * @key_ref: gets to the object
3947 * @cred: the credentials to use
3948 * @perm: requested key permissions
3950 * Return 0 if the task has read and write to the object,
3951 * an error code otherwise
3953 static int smack_key_permission(key_ref_t key_ref,
3954 const struct cred *cred, unsigned perm)
3956 struct key *keyp;
3957 struct smk_audit_info ad;
3958 struct smack_known *tkp = smk_of_task(cred->security);
3959 int request = 0;
3960 int rc;
3962 keyp = key_ref_to_ptr(key_ref);
3963 if (keyp == NULL)
3964 return -EINVAL;
3966 * If the key hasn't been initialized give it access so that
3967 * it may do so.
3969 if (keyp->security == NULL)
3970 return 0;
3972 * This should not occur
3974 if (tkp == NULL)
3975 return -EACCES;
3976 #ifdef CONFIG_AUDIT
3977 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY);
3978 ad.a.u.key_struct.key = keyp->serial;
3979 ad.a.u.key_struct.key_desc = keyp->description;
3980 #endif
3981 if (perm & KEY_NEED_READ)
3982 request = MAY_READ;
3983 if (perm & (KEY_NEED_WRITE | KEY_NEED_LINK | KEY_NEED_SETATTR))
3984 request = MAY_WRITE;
3985 rc = smk_access(tkp, keyp->security, request, &ad);
3986 rc = smk_bu_note("key access", tkp, keyp->security, request, rc);
3987 return rc;
3989 #endif /* CONFIG_KEYS */
3992 * Smack Audit hooks
3994 * Audit requires a unique representation of each Smack specific
3995 * rule. This unique representation is used to distinguish the
3996 * object to be audited from remaining kernel objects and also
3997 * works as a glue between the audit hooks.
3999 * Since repository entries are added but never deleted, we'll use
4000 * the smack_known label address related to the given audit rule as
4001 * the needed unique representation. This also better fits the smack
4002 * model where nearly everything is a label.
4004 #ifdef CONFIG_AUDIT
4007 * smack_audit_rule_init - Initialize a smack audit rule
4008 * @field: audit rule fields given from user-space (audit.h)
4009 * @op: required testing operator (=, !=, >, <, ...)
4010 * @rulestr: smack label to be audited
4011 * @vrule: pointer to save our own audit rule representation
4013 * Prepare to audit cases where (@field @op @rulestr) is true.
4014 * The label to be audited is created if necessay.
4016 static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
4018 struct smack_known *skp;
4019 char **rule = (char **)vrule;
4020 *rule = NULL;
4022 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
4023 return -EINVAL;
4025 if (op != Audit_equal && op != Audit_not_equal)
4026 return -EINVAL;
4028 skp = smk_import_entry(rulestr, 0);
4029 if (skp)
4030 *rule = skp->smk_known;
4032 return 0;
4036 * smack_audit_rule_known - Distinguish Smack audit rules
4037 * @krule: rule of interest, in Audit kernel representation format
4039 * This is used to filter Smack rules from remaining Audit ones.
4040 * If it's proved that this rule belongs to us, the
4041 * audit_rule_match hook will be called to do the final judgement.
4043 static int smack_audit_rule_known(struct audit_krule *krule)
4045 struct audit_field *f;
4046 int i;
4048 for (i = 0; i < krule->field_count; i++) {
4049 f = &krule->fields[i];
4051 if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER)
4052 return 1;
4055 return 0;
4059 * smack_audit_rule_match - Audit given object ?
4060 * @secid: security id for identifying the object to test
4061 * @field: audit rule flags given from user-space
4062 * @op: required testing operator
4063 * @vrule: smack internal rule presentation
4064 * @actx: audit context associated with the check
4066 * The core Audit hook. It's used to take the decision of
4067 * whether to audit or not to audit a given object.
4069 static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule,
4070 struct audit_context *actx)
4072 struct smack_known *skp;
4073 char *rule = vrule;
4075 if (unlikely(!rule)) {
4076 WARN_ONCE(1, "Smack: missing rule\n");
4077 return -ENOENT;
4080 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
4081 return 0;
4083 skp = smack_from_secid(secid);
4086 * No need to do string comparisons. If a match occurs,
4087 * both pointers will point to the same smack_known
4088 * label.
4090 if (op == Audit_equal)
4091 return (rule == skp->smk_known);
4092 if (op == Audit_not_equal)
4093 return (rule != skp->smk_known);
4095 return 0;
4099 * smack_audit_rule_free - free smack rule representation
4100 * @vrule: rule to be freed.
4102 * No memory was allocated.
4104 static void smack_audit_rule_free(void *vrule)
4106 /* No-op */
4109 #endif /* CONFIG_AUDIT */
4112 * smack_ismaclabel - check if xattr @name references a smack MAC label
4113 * @name: Full xattr name to check.
4115 static int smack_ismaclabel(const char *name)
4117 return (strcmp(name, XATTR_SMACK_SUFFIX) == 0);
4122 * smack_secid_to_secctx - return the smack label for a secid
4123 * @secid: incoming integer
4124 * @secdata: destination
4125 * @seclen: how long it is
4127 * Exists for networking code.
4129 static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
4131 struct smack_known *skp = smack_from_secid(secid);
4133 if (secdata)
4134 *secdata = skp->smk_known;
4135 *seclen = strlen(skp->smk_known);
4136 return 0;
4140 * smack_secctx_to_secid - return the secid for a smack label
4141 * @secdata: smack label
4142 * @seclen: how long result is
4143 * @secid: outgoing integer
4145 * Exists for audit and networking code.
4147 static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
4149 struct smack_known *skp = smk_find_entry(secdata);
4151 if (skp)
4152 *secid = skp->smk_secid;
4153 else
4154 *secid = 0;
4155 return 0;
4159 * smack_release_secctx - don't do anything.
4160 * @secdata: unused
4161 * @seclen: unused
4163 * Exists to make sure nothing gets done, and properly
4165 static void smack_release_secctx(char *secdata, u32 seclen)
4169 static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
4171 return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0);
4174 static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
4176 return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0);
4179 static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
4181 int len = 0;
4182 len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true);
4184 if (len < 0)
4185 return len;
4186 *ctxlen = len;
4187 return 0;
4190 struct security_operations smack_ops = {
4191 .name = "smack",
4193 .ptrace_access_check = smack_ptrace_access_check,
4194 .ptrace_traceme = smack_ptrace_traceme,
4195 .syslog = smack_syslog,
4197 .sb_alloc_security = smack_sb_alloc_security,
4198 .sb_free_security = smack_sb_free_security,
4199 .sb_copy_data = smack_sb_copy_data,
4200 .sb_kern_mount = smack_sb_kern_mount,
4201 .sb_statfs = smack_sb_statfs,
4203 .bprm_set_creds = smack_bprm_set_creds,
4204 .bprm_committing_creds = smack_bprm_committing_creds,
4205 .bprm_secureexec = smack_bprm_secureexec,
4207 .inode_alloc_security = smack_inode_alloc_security,
4208 .inode_free_security = smack_inode_free_security,
4209 .inode_init_security = smack_inode_init_security,
4210 .inode_link = smack_inode_link,
4211 .inode_unlink = smack_inode_unlink,
4212 .inode_rmdir = smack_inode_rmdir,
4213 .inode_rename = smack_inode_rename,
4214 .inode_permission = smack_inode_permission,
4215 .inode_setattr = smack_inode_setattr,
4216 .inode_getattr = smack_inode_getattr,
4217 .inode_setxattr = smack_inode_setxattr,
4218 .inode_post_setxattr = smack_inode_post_setxattr,
4219 .inode_getxattr = smack_inode_getxattr,
4220 .inode_removexattr = smack_inode_removexattr,
4221 .inode_getsecurity = smack_inode_getsecurity,
4222 .inode_setsecurity = smack_inode_setsecurity,
4223 .inode_listsecurity = smack_inode_listsecurity,
4224 .inode_getsecid = smack_inode_getsecid,
4226 .file_permission = smack_file_permission,
4227 .file_alloc_security = smack_file_alloc_security,
4228 .file_free_security = smack_file_free_security,
4229 .file_ioctl = smack_file_ioctl,
4230 .file_lock = smack_file_lock,
4231 .file_fcntl = smack_file_fcntl,
4232 .mmap_file = smack_mmap_file,
4233 .mmap_addr = cap_mmap_addr,
4234 .file_set_fowner = smack_file_set_fowner,
4235 .file_send_sigiotask = smack_file_send_sigiotask,
4236 .file_receive = smack_file_receive,
4238 .file_open = smack_file_open,
4240 .cred_alloc_blank = smack_cred_alloc_blank,
4241 .cred_free = smack_cred_free,
4242 .cred_prepare = smack_cred_prepare,
4243 .cred_transfer = smack_cred_transfer,
4244 .kernel_act_as = smack_kernel_act_as,
4245 .kernel_create_files_as = smack_kernel_create_files_as,
4246 .task_setpgid = smack_task_setpgid,
4247 .task_getpgid = smack_task_getpgid,
4248 .task_getsid = smack_task_getsid,
4249 .task_getsecid = smack_task_getsecid,
4250 .task_setnice = smack_task_setnice,
4251 .task_setioprio = smack_task_setioprio,
4252 .task_getioprio = smack_task_getioprio,
4253 .task_setscheduler = smack_task_setscheduler,
4254 .task_getscheduler = smack_task_getscheduler,
4255 .task_movememory = smack_task_movememory,
4256 .task_kill = smack_task_kill,
4257 .task_wait = smack_task_wait,
4258 .task_to_inode = smack_task_to_inode,
4260 .ipc_permission = smack_ipc_permission,
4261 .ipc_getsecid = smack_ipc_getsecid,
4263 .msg_msg_alloc_security = smack_msg_msg_alloc_security,
4264 .msg_msg_free_security = smack_msg_msg_free_security,
4266 .msg_queue_alloc_security = smack_msg_queue_alloc_security,
4267 .msg_queue_free_security = smack_msg_queue_free_security,
4268 .msg_queue_associate = smack_msg_queue_associate,
4269 .msg_queue_msgctl = smack_msg_queue_msgctl,
4270 .msg_queue_msgsnd = smack_msg_queue_msgsnd,
4271 .msg_queue_msgrcv = smack_msg_queue_msgrcv,
4273 .shm_alloc_security = smack_shm_alloc_security,
4274 .shm_free_security = smack_shm_free_security,
4275 .shm_associate = smack_shm_associate,
4276 .shm_shmctl = smack_shm_shmctl,
4277 .shm_shmat = smack_shm_shmat,
4279 .sem_alloc_security = smack_sem_alloc_security,
4280 .sem_free_security = smack_sem_free_security,
4281 .sem_associate = smack_sem_associate,
4282 .sem_semctl = smack_sem_semctl,
4283 .sem_semop = smack_sem_semop,
4285 .d_instantiate = smack_d_instantiate,
4287 .getprocattr = smack_getprocattr,
4288 .setprocattr = smack_setprocattr,
4290 .unix_stream_connect = smack_unix_stream_connect,
4291 .unix_may_send = smack_unix_may_send,
4293 .socket_post_create = smack_socket_post_create,
4294 #ifndef CONFIG_SECURITY_SMACK_NETFILTER
4295 .socket_bind = smack_socket_bind,
4296 #endif /* CONFIG_SECURITY_SMACK_NETFILTER */
4297 .socket_connect = smack_socket_connect,
4298 .socket_sendmsg = smack_socket_sendmsg,
4299 .socket_sock_rcv_skb = smack_socket_sock_rcv_skb,
4300 .socket_getpeersec_stream = smack_socket_getpeersec_stream,
4301 .socket_getpeersec_dgram = smack_socket_getpeersec_dgram,
4302 .sk_alloc_security = smack_sk_alloc_security,
4303 .sk_free_security = smack_sk_free_security,
4304 .sock_graft = smack_sock_graft,
4305 .inet_conn_request = smack_inet_conn_request,
4306 .inet_csk_clone = smack_inet_csk_clone,
4308 /* key management security hooks */
4309 #ifdef CONFIG_KEYS
4310 .key_alloc = smack_key_alloc,
4311 .key_free = smack_key_free,
4312 .key_permission = smack_key_permission,
4313 #endif /* CONFIG_KEYS */
4315 /* Audit hooks */
4316 #ifdef CONFIG_AUDIT
4317 .audit_rule_init = smack_audit_rule_init,
4318 .audit_rule_known = smack_audit_rule_known,
4319 .audit_rule_match = smack_audit_rule_match,
4320 .audit_rule_free = smack_audit_rule_free,
4321 #endif /* CONFIG_AUDIT */
4323 .ismaclabel = smack_ismaclabel,
4324 .secid_to_secctx = smack_secid_to_secctx,
4325 .secctx_to_secid = smack_secctx_to_secid,
4326 .release_secctx = smack_release_secctx,
4327 .inode_notifysecctx = smack_inode_notifysecctx,
4328 .inode_setsecctx = smack_inode_setsecctx,
4329 .inode_getsecctx = smack_inode_getsecctx,
4333 static __init void init_smack_known_list(void)
4336 * Initialize rule list locks
4338 mutex_init(&smack_known_huh.smk_rules_lock);
4339 mutex_init(&smack_known_hat.smk_rules_lock);
4340 mutex_init(&smack_known_floor.smk_rules_lock);
4341 mutex_init(&smack_known_star.smk_rules_lock);
4342 mutex_init(&smack_known_invalid.smk_rules_lock);
4343 mutex_init(&smack_known_web.smk_rules_lock);
4345 * Initialize rule lists
4347 INIT_LIST_HEAD(&smack_known_huh.smk_rules);
4348 INIT_LIST_HEAD(&smack_known_hat.smk_rules);
4349 INIT_LIST_HEAD(&smack_known_star.smk_rules);
4350 INIT_LIST_HEAD(&smack_known_floor.smk_rules);
4351 INIT_LIST_HEAD(&smack_known_invalid.smk_rules);
4352 INIT_LIST_HEAD(&smack_known_web.smk_rules);
4354 * Create the known labels list
4356 smk_insert_entry(&smack_known_huh);
4357 smk_insert_entry(&smack_known_hat);
4358 smk_insert_entry(&smack_known_star);
4359 smk_insert_entry(&smack_known_floor);
4360 smk_insert_entry(&smack_known_invalid);
4361 smk_insert_entry(&smack_known_web);
4365 * smack_init - initialize the smack system
4367 * Returns 0
4369 static __init int smack_init(void)
4371 struct cred *cred;
4372 struct task_smack *tsp;
4374 if (!security_module_enable(&smack_ops))
4375 return 0;
4377 smack_enabled = 1;
4379 smack_inode_cache = KMEM_CACHE(inode_smack, 0);
4380 if (!smack_inode_cache)
4381 return -ENOMEM;
4383 tsp = new_task_smack(&smack_known_floor, &smack_known_floor,
4384 GFP_KERNEL);
4385 if (tsp == NULL) {
4386 kmem_cache_destroy(smack_inode_cache);
4387 return -ENOMEM;
4390 printk(KERN_INFO "Smack: Initializing.\n");
4393 * Set the security state for the initial task.
4395 cred = (struct cred *) current->cred;
4396 cred->security = tsp;
4398 /* initialize the smack_known_list */
4399 init_smack_known_list();
4402 * Register with LSM
4404 if (register_security(&smack_ops))
4405 panic("smack: Unable to register with kernel.\n");
4407 return 0;
4411 * Smack requires early initialization in order to label
4412 * all processes and objects when they are created.
4414 security_initcall(smack_init);