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26#include <linux/init.h>
27#include <linux/kd.h>
28#include <linux/kernel.h>
29#include <linux/tracehook.h>
30#include <linux/errno.h>
31#include <linux/sched.h>
32#include <linux/security.h>
33#include <linux/xattr.h>
34#include <linux/capability.h>
35#include <linux/unistd.h>
36#include <linux/mm.h>
37#include <linux/mman.h>
38#include <linux/slab.h>
39#include <linux/pagemap.h>
40#include <linux/proc_fs.h>
41#include <linux/swap.h>
42#include <linux/spinlock.h>
43#include <linux/syscalls.h>
44#include <linux/dcache.h>
45#include <linux/file.h>
46#include <linux/fdtable.h>
47#include <linux/namei.h>
48#include <linux/mount.h>
49#include <linux/netfilter_ipv4.h>
50#include <linux/netfilter_ipv6.h>
51#include <linux/tty.h>
52#include <net/icmp.h>
53#include <net/ip.h>
54#include <net/sock.h>
55#include <net/tcp.h>
56#include <net/net_namespace.h>
57#include <net/netlabel.h>
58#include <linux/uaccess.h>
59#include <asm/ioctls.h>
60#include <linux/atomic.h>
61#include <linux/bitops.h>
62#include <linux/interrupt.h>
63#include <linux/netdevice.h>
64#include <net/netlink.h>
65#include <linux/tcp.h>
66#include <linux/udp.h>
67#include <linux/dccp.h>
68#include <linux/quota.h>
69#include <linux/un.h>
70#include <net/af_unix.h>
71#include <linux/parser.h>
72#include <linux/nfs_mount.h>
73#include <net/ipv6.h>
74#include <linux/hugetlb.h>
75#include <linux/personality.h>
76#include <linux/audit.h>
77#include <linux/string.h>
78#include <linux/selinux.h>
79#include <linux/mutex.h>
80#include <linux/posix-timers.h>
81#include <linux/syslog.h>
82#include <linux/user_namespace.h>
83#include <linux/export.h>
84#include <linux/security.h>
85#include <linux/msg.h>
86#include <linux/shm.h>
87
88#include "avc.h"
89#include "objsec.h"
90#include "netif.h"
91#include "netnode.h"
92#include "netport.h"
93#include "xfrm.h"
94#include "netlabel.h"
95#include "audit.h"
96#include "avc_ss.h"
97
98#define NUM_SEL_MNT_OPTS 5
99
100extern struct security_operations *security_ops;
101
102
103static atomic_t selinux_secmark_refcount = ATOMIC_INIT(0);
104
105#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
106int selinux_enforcing;
107
108static int __init enforcing_setup(char *str)
109{
110 unsigned long enforcing;
111 if (!strict_strtoul(str, 0, &enforcing))
112 selinux_enforcing = enforcing ? 1 : 0;
113 return 1;
114}
115__setup("enforcing=", enforcing_setup);
116#endif
117
118#ifdef CONFIG_SECURITY_SELINUX_BOOTPARAM
119int selinux_enabled = CONFIG_SECURITY_SELINUX_BOOTPARAM_VALUE;
120
121static int __init selinux_enabled_setup(char *str)
122{
123 unsigned long enabled;
124 if (!strict_strtoul(str, 0, &enabled))
125 selinux_enabled = enabled ? 1 : 0;
126 return 1;
127}
128__setup("selinux=", selinux_enabled_setup);
129#else
130int selinux_enabled = 1;
131#endif
132
133static struct kmem_cache *sel_inode_cache;
134
135
136
137
138
139
140
141
142
143
144
145static int selinux_secmark_enabled(void)
146{
147 return (atomic_read(&selinux_secmark_refcount) > 0);
148}
149
150
151
152
153static void cred_init_security(void)
154{
155 struct cred *cred = (struct cred *) current->real_cred;
156 struct task_security_struct *tsec;
157
158 tsec = kzalloc(sizeof(struct task_security_struct), GFP_KERNEL);
159 if (!tsec)
160 panic("SELinux: Failed to initialize initial task.\n");
161
162 tsec->osid = tsec->sid = SECINITSID_KERNEL;
163 cred->security = tsec;
164}
165
166
167
168
169static inline u32 cred_sid(const struct cred *cred)
170{
171 const struct task_security_struct *tsec;
172
173 tsec = cred->security;
174 return tsec->sid;
175}
176
177
178
179
180static inline u32 task_sid(const struct task_struct *task)
181{
182 u32 sid;
183
184 rcu_read_lock();
185 sid = cred_sid(__task_cred(task));
186 rcu_read_unlock();
187 return sid;
188}
189
190
191
192
193static inline u32 current_sid(void)
194{
195 const struct task_security_struct *tsec = current_security();
196
197 return tsec->sid;
198}
199
200
201
202static int inode_alloc_security(struct inode *inode)
203{
204 struct inode_security_struct *isec;
205 u32 sid = current_sid();
206
207 isec = kmem_cache_zalloc(sel_inode_cache, GFP_NOFS);
208 if (!isec)
209 return -ENOMEM;
210
211 mutex_init(&isec->lock);
212 INIT_LIST_HEAD(&isec->list);
213 isec->inode = inode;
214 isec->sid = SECINITSID_UNLABELED;
215 isec->sclass = SECCLASS_FILE;
216 isec->task_sid = sid;
217 inode->i_security = isec;
218
219 return 0;
220}
221
222static void inode_free_security(struct inode *inode)
223{
224 struct inode_security_struct *isec = inode->i_security;
225 struct superblock_security_struct *sbsec = inode->i_sb->s_security;
226
227 spin_lock(&sbsec->isec_lock);
228 if (!list_empty(&isec->list))
229 list_del_init(&isec->list);
230 spin_unlock(&sbsec->isec_lock);
231
232 inode->i_security = NULL;
233 kmem_cache_free(sel_inode_cache, isec);
234}
235
236static int file_alloc_security(struct file *file)
237{
238 struct file_security_struct *fsec;
239 u32 sid = current_sid();
240
241 fsec = kzalloc(sizeof(struct file_security_struct), GFP_KERNEL);
242 if (!fsec)
243 return -ENOMEM;
244
245 fsec->sid = sid;
246 fsec->fown_sid = sid;
247 file->f_security = fsec;
248
249 return 0;
250}
251
252static void file_free_security(struct file *file)
253{
254 struct file_security_struct *fsec = file->f_security;
255 file->f_security = NULL;
256 kfree(fsec);
257}
258
259static int superblock_alloc_security(struct super_block *sb)
260{
261 struct superblock_security_struct *sbsec;
262
263 sbsec = kzalloc(sizeof(struct superblock_security_struct), GFP_KERNEL);
264 if (!sbsec)
265 return -ENOMEM;
266
267 mutex_init(&sbsec->lock);
268 INIT_LIST_HEAD(&sbsec->isec_head);
269 spin_lock_init(&sbsec->isec_lock);
270 sbsec->sb = sb;
271 sbsec->sid = SECINITSID_UNLABELED;
272 sbsec->def_sid = SECINITSID_FILE;
273 sbsec->mntpoint_sid = SECINITSID_UNLABELED;
274 sb->s_security = sbsec;
275
276 return 0;
277}
278
279static void superblock_free_security(struct super_block *sb)
280{
281 struct superblock_security_struct *sbsec = sb->s_security;
282 sb->s_security = NULL;
283 kfree(sbsec);
284}
285
286
287
288static const char *labeling_behaviors[7] = {
289 "uses xattr",
290 "uses transition SIDs",
291 "uses task SIDs",
292 "uses genfs_contexts",
293 "not configured for labeling",
294 "uses mountpoint labeling",
295 "uses native labeling",
296};
297
298static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry);
299
300static inline int inode_doinit(struct inode *inode)
301{
302 return inode_doinit_with_dentry(inode, NULL);
303}
304
305enum {
306 Opt_error = -1,
307 Opt_context = 1,
308 Opt_fscontext = 2,
309 Opt_defcontext = 3,
310 Opt_rootcontext = 4,
311 Opt_labelsupport = 5,
312};
313
314static const match_table_t tokens = {
315 {Opt_context, CONTEXT_STR "%s"},
316 {Opt_fscontext, FSCONTEXT_STR "%s"},
317 {Opt_defcontext, DEFCONTEXT_STR "%s"},
318 {Opt_rootcontext, ROOTCONTEXT_STR "%s"},
319 {Opt_labelsupport, LABELSUPP_STR},
320 {Opt_error, NULL},
321};
322
323#define SEL_MOUNT_FAIL_MSG "SELinux: duplicate or incompatible mount options\n"
324
325static int may_context_mount_sb_relabel(u32 sid,
326 struct superblock_security_struct *sbsec,
327 const struct cred *cred)
328{
329 const struct task_security_struct *tsec = cred->security;
330 int rc;
331
332 rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM,
333 FILESYSTEM__RELABELFROM, NULL);
334 if (rc)
335 return rc;
336
337 rc = avc_has_perm(tsec->sid, sid, SECCLASS_FILESYSTEM,
338 FILESYSTEM__RELABELTO, NULL);
339 return rc;
340}
341
342static int may_context_mount_inode_relabel(u32 sid,
343 struct superblock_security_struct *sbsec,
344 const struct cred *cred)
345{
346 const struct task_security_struct *tsec = cred->security;
347 int rc;
348 rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM,
349 FILESYSTEM__RELABELFROM, NULL);
350 if (rc)
351 return rc;
352
353 rc = avc_has_perm(sid, sbsec->sid, SECCLASS_FILESYSTEM,
354 FILESYSTEM__ASSOCIATE, NULL);
355 return rc;
356}
357
358static int sb_finish_set_opts(struct super_block *sb)
359{
360 struct superblock_security_struct *sbsec = sb->s_security;
361 struct dentry *root = sb->s_root;
362 struct inode *root_inode = root->d_inode;
363 int rc = 0;
364
365 if (sbsec->behavior == SECURITY_FS_USE_XATTR) {
366
367
368
369
370
371 if (!root_inode->i_op->getxattr) {
372 printk(KERN_WARNING "SELinux: (dev %s, type %s) has no "
373 "xattr support\n", sb->s_id, sb->s_type->name);
374 rc = -EOPNOTSUPP;
375 goto out;
376 }
377 rc = root_inode->i_op->getxattr(root, XATTR_NAME_SELINUX, NULL, 0);
378 if (rc < 0 && rc != -ENODATA) {
379 if (rc == -EOPNOTSUPP)
380 printk(KERN_WARNING "SELinux: (dev %s, type "
381 "%s) has no security xattr handler\n",
382 sb->s_id, sb->s_type->name);
383 else
384 printk(KERN_WARNING "SELinux: (dev %s, type "
385 "%s) getxattr errno %d\n", sb->s_id,
386 sb->s_type->name, -rc);
387 goto out;
388 }
389 }
390
391 sbsec->flags |= (SE_SBINITIALIZED | SE_SBLABELSUPP);
392
393 if (sbsec->behavior > ARRAY_SIZE(labeling_behaviors))
394 printk(KERN_ERR "SELinux: initialized (dev %s, type %s), unknown behavior\n",
395 sb->s_id, sb->s_type->name);
396 else
397 printk(KERN_DEBUG "SELinux: initialized (dev %s, type %s), %s\n",
398 sb->s_id, sb->s_type->name,
399 labeling_behaviors[sbsec->behavior-1]);
400
401 if (sbsec->behavior == SECURITY_FS_USE_GENFS ||
402 sbsec->behavior == SECURITY_FS_USE_MNTPOINT ||
403 sbsec->behavior == SECURITY_FS_USE_NONE ||
404 sbsec->behavior > ARRAY_SIZE(labeling_behaviors))
405 sbsec->flags &= ~SE_SBLABELSUPP;
406
407
408 if (strncmp(sb->s_type->name, "sysfs", sizeof("sysfs")) == 0)
409 sbsec->flags |= SE_SBLABELSUPP;
410
411
412 rc = inode_doinit_with_dentry(root_inode, root);
413
414
415
416
417
418 spin_lock(&sbsec->isec_lock);
419next_inode:
420 if (!list_empty(&sbsec->isec_head)) {
421 struct inode_security_struct *isec =
422 list_entry(sbsec->isec_head.next,
423 struct inode_security_struct, list);
424 struct inode *inode = isec->inode;
425 spin_unlock(&sbsec->isec_lock);
426 inode = igrab(inode);
427 if (inode) {
428 if (!IS_PRIVATE(inode))
429 inode_doinit(inode);
430 iput(inode);
431 }
432 spin_lock(&sbsec->isec_lock);
433 list_del_init(&isec->list);
434 goto next_inode;
435 }
436 spin_unlock(&sbsec->isec_lock);
437out:
438 return rc;
439}
440
441
442
443
444
445
446static int selinux_get_mnt_opts(const struct super_block *sb,
447 struct security_mnt_opts *opts)
448{
449 int rc = 0, i;
450 struct superblock_security_struct *sbsec = sb->s_security;
451 char *context = NULL;
452 u32 len;
453 char tmp;
454
455 security_init_mnt_opts(opts);
456
457 if (!(sbsec->flags & SE_SBINITIALIZED))
458 return -EINVAL;
459
460 if (!ss_initialized)
461 return -EINVAL;
462
463 tmp = sbsec->flags & SE_MNTMASK;
464
465 for (i = 0; i < 8; i++) {
466 if (tmp & 0x01)
467 opts->num_mnt_opts++;
468 tmp >>= 1;
469 }
470
471 if (sbsec->flags & SE_SBLABELSUPP)
472 opts->num_mnt_opts++;
473
474 opts->mnt_opts = kcalloc(opts->num_mnt_opts, sizeof(char *), GFP_ATOMIC);
475 if (!opts->mnt_opts) {
476 rc = -ENOMEM;
477 goto out_free;
478 }
479
480 opts->mnt_opts_flags = kcalloc(opts->num_mnt_opts, sizeof(int), GFP_ATOMIC);
481 if (!opts->mnt_opts_flags) {
482 rc = -ENOMEM;
483 goto out_free;
484 }
485
486 i = 0;
487 if (sbsec->flags & FSCONTEXT_MNT) {
488 rc = security_sid_to_context(sbsec->sid, &context, &len);
489 if (rc)
490 goto out_free;
491 opts->mnt_opts[i] = context;
492 opts->mnt_opts_flags[i++] = FSCONTEXT_MNT;
493 }
494 if (sbsec->flags & CONTEXT_MNT) {
495 rc = security_sid_to_context(sbsec->mntpoint_sid, &context, &len);
496 if (rc)
497 goto out_free;
498 opts->mnt_opts[i] = context;
499 opts->mnt_opts_flags[i++] = CONTEXT_MNT;
500 }
501 if (sbsec->flags & DEFCONTEXT_MNT) {
502 rc = security_sid_to_context(sbsec->def_sid, &context, &len);
503 if (rc)
504 goto out_free;
505 opts->mnt_opts[i] = context;
506 opts->mnt_opts_flags[i++] = DEFCONTEXT_MNT;
507 }
508 if (sbsec->flags & ROOTCONTEXT_MNT) {
509 struct inode *root = sbsec->sb->s_root->d_inode;
510 struct inode_security_struct *isec = root->i_security;
511
512 rc = security_sid_to_context(isec->sid, &context, &len);
513 if (rc)
514 goto out_free;
515 opts->mnt_opts[i] = context;
516 opts->mnt_opts_flags[i++] = ROOTCONTEXT_MNT;
517 }
518 if (sbsec->flags & SE_SBLABELSUPP) {
519 opts->mnt_opts[i] = NULL;
520 opts->mnt_opts_flags[i++] = SE_SBLABELSUPP;
521 }
522
523 BUG_ON(i != opts->num_mnt_opts);
524
525 return 0;
526
527out_free:
528 security_free_mnt_opts(opts);
529 return rc;
530}
531
532static int bad_option(struct superblock_security_struct *sbsec, char flag,
533 u32 old_sid, u32 new_sid)
534{
535 char mnt_flags = sbsec->flags & SE_MNTMASK;
536
537
538 if (sbsec->flags & SE_SBINITIALIZED)
539 if (!(sbsec->flags & flag) ||
540 (old_sid != new_sid))
541 return 1;
542
543
544
545
546 if (!(sbsec->flags & SE_SBINITIALIZED))
547 if (mnt_flags & flag)
548 return 1;
549 return 0;
550}
551
552
553
554
555
556static int selinux_set_mnt_opts(struct super_block *sb,
557 struct security_mnt_opts *opts,
558 unsigned long kern_flags,
559 unsigned long *set_kern_flags)
560{
561 const struct cred *cred = current_cred();
562 int rc = 0, i;
563 struct superblock_security_struct *sbsec = sb->s_security;
564 const char *name = sb->s_type->name;
565 struct inode *inode = sbsec->sb->s_root->d_inode;
566 struct inode_security_struct *root_isec = inode->i_security;
567 u32 fscontext_sid = 0, context_sid = 0, rootcontext_sid = 0;
568 u32 defcontext_sid = 0;
569 char **mount_options = opts->mnt_opts;
570 int *flags = opts->mnt_opts_flags;
571 int num_opts = opts->num_mnt_opts;
572
573 mutex_lock(&sbsec->lock);
574
575 if (!ss_initialized) {
576 if (!num_opts) {
577
578
579
580 goto out;
581 }
582 rc = -EINVAL;
583 printk(KERN_WARNING "SELinux: Unable to set superblock options "
584 "before the security server is initialized\n");
585 goto out;
586 }
587 if (kern_flags && !set_kern_flags) {
588
589
590 rc = -EINVAL;
591 goto out;
592 }
593
594
595
596
597
598
599
600
601
602
603
604
605 if ((sbsec->flags & SE_SBINITIALIZED) && (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA)
606 && (num_opts == 0))
607 goto out;
608
609
610
611
612
613
614 for (i = 0; i < num_opts; i++) {
615 u32 sid;
616
617 if (flags[i] == SE_SBLABELSUPP)
618 continue;
619 rc = security_context_to_sid(mount_options[i],
620 strlen(mount_options[i]), &sid);
621 if (rc) {
622 printk(KERN_WARNING "SELinux: security_context_to_sid"
623 "(%s) failed for (dev %s, type %s) errno=%d\n",
624 mount_options[i], sb->s_id, name, rc);
625 goto out;
626 }
627 switch (flags[i]) {
628 case FSCONTEXT_MNT:
629 fscontext_sid = sid;
630
631 if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid,
632 fscontext_sid))
633 goto out_double_mount;
634
635 sbsec->flags |= FSCONTEXT_MNT;
636 break;
637 case CONTEXT_MNT:
638 context_sid = sid;
639
640 if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid,
641 context_sid))
642 goto out_double_mount;
643
644 sbsec->flags |= CONTEXT_MNT;
645 break;
646 case ROOTCONTEXT_MNT:
647 rootcontext_sid = sid;
648
649 if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid,
650 rootcontext_sid))
651 goto out_double_mount;
652
653 sbsec->flags |= ROOTCONTEXT_MNT;
654
655 break;
656 case DEFCONTEXT_MNT:
657 defcontext_sid = sid;
658
659 if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid,
660 defcontext_sid))
661 goto out_double_mount;
662
663 sbsec->flags |= DEFCONTEXT_MNT;
664
665 break;
666 default:
667 rc = -EINVAL;
668 goto out;
669 }
670 }
671
672 if (sbsec->flags & SE_SBINITIALIZED) {
673
674 if ((sbsec->flags & SE_MNTMASK) && !num_opts)
675 goto out_double_mount;
676 rc = 0;
677 goto out;
678 }
679
680 if (strcmp(sb->s_type->name, "proc") == 0)
681 sbsec->flags |= SE_SBPROC;
682
683 if (!sbsec->behavior) {
684
685
686
687
688 rc = security_fs_use((sbsec->flags & SE_SBPROC) ?
689 "proc" : sb->s_type->name,
690 &sbsec->behavior, &sbsec->sid);
691 if (rc) {
692 printk(KERN_WARNING
693 "%s: security_fs_use(%s) returned %d\n",
694 __func__, sb->s_type->name, rc);
695 goto out;
696 }
697 }
698
699 if (fscontext_sid) {
700 rc = may_context_mount_sb_relabel(fscontext_sid, sbsec, cred);
701 if (rc)
702 goto out;
703
704 sbsec->sid = fscontext_sid;
705 }
706
707
708
709
710
711
712 if (kern_flags & SECURITY_LSM_NATIVE_LABELS && !context_sid) {
713 sbsec->behavior = SECURITY_FS_USE_NATIVE;
714 *set_kern_flags |= SECURITY_LSM_NATIVE_LABELS;
715 }
716
717 if (context_sid) {
718 if (!fscontext_sid) {
719 rc = may_context_mount_sb_relabel(context_sid, sbsec,
720 cred);
721 if (rc)
722 goto out;
723 sbsec->sid = context_sid;
724 } else {
725 rc = may_context_mount_inode_relabel(context_sid, sbsec,
726 cred);
727 if (rc)
728 goto out;
729 }
730 if (!rootcontext_sid)
731 rootcontext_sid = context_sid;
732
733 sbsec->mntpoint_sid = context_sid;
734 sbsec->behavior = SECURITY_FS_USE_MNTPOINT;
735 }
736
737 if (rootcontext_sid) {
738 rc = may_context_mount_inode_relabel(rootcontext_sid, sbsec,
739 cred);
740 if (rc)
741 goto out;
742
743 root_isec->sid = rootcontext_sid;
744 root_isec->initialized = 1;
745 }
746
747 if (defcontext_sid) {
748 if (sbsec->behavior != SECURITY_FS_USE_XATTR &&
749 sbsec->behavior != SECURITY_FS_USE_NATIVE) {
750 rc = -EINVAL;
751 printk(KERN_WARNING "SELinux: defcontext option is "
752 "invalid for this filesystem type\n");
753 goto out;
754 }
755
756 if (defcontext_sid != sbsec->def_sid) {
757 rc = may_context_mount_inode_relabel(defcontext_sid,
758 sbsec, cred);
759 if (rc)
760 goto out;
761 }
762
763 sbsec->def_sid = defcontext_sid;
764 }
765
766 rc = sb_finish_set_opts(sb);
767out:
768 mutex_unlock(&sbsec->lock);
769 return rc;
770out_double_mount:
771 rc = -EINVAL;
772 printk(KERN_WARNING "SELinux: mount invalid. Same superblock, different "
773 "security settings for (dev %s, type %s)\n", sb->s_id, name);
774 goto out;
775}
776
777static int selinux_cmp_sb_context(const struct super_block *oldsb,
778 const struct super_block *newsb)
779{
780 struct superblock_security_struct *old = oldsb->s_security;
781 struct superblock_security_struct *new = newsb->s_security;
782 char oldflags = old->flags & SE_MNTMASK;
783 char newflags = new->flags & SE_MNTMASK;
784
785 if (oldflags != newflags)
786 goto mismatch;
787 if ((oldflags & FSCONTEXT_MNT) && old->sid != new->sid)
788 goto mismatch;
789 if ((oldflags & CONTEXT_MNT) && old->mntpoint_sid != new->mntpoint_sid)
790 goto mismatch;
791 if ((oldflags & DEFCONTEXT_MNT) && old->def_sid != new->def_sid)
792 goto mismatch;
793 if (oldflags & ROOTCONTEXT_MNT) {
794 struct inode_security_struct *oldroot = oldsb->s_root->d_inode->i_security;
795 struct inode_security_struct *newroot = newsb->s_root->d_inode->i_security;
796 if (oldroot->sid != newroot->sid)
797 goto mismatch;
798 }
799 return 0;
800mismatch:
801 printk(KERN_WARNING "SELinux: mount invalid. Same superblock, "
802 "different security settings for (dev %s, "
803 "type %s)\n", newsb->s_id, newsb->s_type->name);
804 return -EBUSY;
805}
806
807static int selinux_sb_clone_mnt_opts(const struct super_block *oldsb,
808 struct super_block *newsb)
809{
810 const struct superblock_security_struct *oldsbsec = oldsb->s_security;
811 struct superblock_security_struct *newsbsec = newsb->s_security;
812
813 int set_fscontext = (oldsbsec->flags & FSCONTEXT_MNT);
814 int set_context = (oldsbsec->flags & CONTEXT_MNT);
815 int set_rootcontext = (oldsbsec->flags & ROOTCONTEXT_MNT);
816
817
818
819
820
821 if (!ss_initialized)
822 return 0;
823
824
825 BUG_ON(!(oldsbsec->flags & SE_SBINITIALIZED));
826
827
828 if (newsbsec->flags & SE_SBINITIALIZED)
829 return selinux_cmp_sb_context(oldsb, newsb);
830
831 mutex_lock(&newsbsec->lock);
832
833 newsbsec->flags = oldsbsec->flags;
834
835 newsbsec->sid = oldsbsec->sid;
836 newsbsec->def_sid = oldsbsec->def_sid;
837 newsbsec->behavior = oldsbsec->behavior;
838
839 if (set_context) {
840 u32 sid = oldsbsec->mntpoint_sid;
841
842 if (!set_fscontext)
843 newsbsec->sid = sid;
844 if (!set_rootcontext) {
845 struct inode *newinode = newsb->s_root->d_inode;
846 struct inode_security_struct *newisec = newinode->i_security;
847 newisec->sid = sid;
848 }
849 newsbsec->mntpoint_sid = sid;
850 }
851 if (set_rootcontext) {
852 const struct inode *oldinode = oldsb->s_root->d_inode;
853 const struct inode_security_struct *oldisec = oldinode->i_security;
854 struct inode *newinode = newsb->s_root->d_inode;
855 struct inode_security_struct *newisec = newinode->i_security;
856
857 newisec->sid = oldisec->sid;
858 }
859
860 sb_finish_set_opts(newsb);
861 mutex_unlock(&newsbsec->lock);
862 return 0;
863}
864
865static int selinux_parse_opts_str(char *options,
866 struct security_mnt_opts *opts)
867{
868 char *p;
869 char *context = NULL, *defcontext = NULL;
870 char *fscontext = NULL, *rootcontext = NULL;
871 int rc, num_mnt_opts = 0;
872
873 opts->num_mnt_opts = 0;
874
875
876 while ((p = strsep(&options, "|")) != NULL) {
877 int token;
878 substring_t args[MAX_OPT_ARGS];
879
880 if (!*p)
881 continue;
882
883 token = match_token(p, tokens, args);
884
885 switch (token) {
886 case Opt_context:
887 if (context || defcontext) {
888 rc = -EINVAL;
889 printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
890 goto out_err;
891 }
892 context = match_strdup(&args[0]);
893 if (!context) {
894 rc = -ENOMEM;
895 goto out_err;
896 }
897 break;
898
899 case Opt_fscontext:
900 if (fscontext) {
901 rc = -EINVAL;
902 printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
903 goto out_err;
904 }
905 fscontext = match_strdup(&args[0]);
906 if (!fscontext) {
907 rc = -ENOMEM;
908 goto out_err;
909 }
910 break;
911
912 case Opt_rootcontext:
913 if (rootcontext) {
914 rc = -EINVAL;
915 printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
916 goto out_err;
917 }
918 rootcontext = match_strdup(&args[0]);
919 if (!rootcontext) {
920 rc = -ENOMEM;
921 goto out_err;
922 }
923 break;
924
925 case Opt_defcontext:
926 if (context || defcontext) {
927 rc = -EINVAL;
928 printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
929 goto out_err;
930 }
931 defcontext = match_strdup(&args[0]);
932 if (!defcontext) {
933 rc = -ENOMEM;
934 goto out_err;
935 }
936 break;
937 case Opt_labelsupport:
938 break;
939 default:
940 rc = -EINVAL;
941 printk(KERN_WARNING "SELinux: unknown mount option\n");
942 goto out_err;
943
944 }
945 }
946
947 rc = -ENOMEM;
948 opts->mnt_opts = kcalloc(NUM_SEL_MNT_OPTS, sizeof(char *), GFP_ATOMIC);
949 if (!opts->mnt_opts)
950 goto out_err;
951
952 opts->mnt_opts_flags = kcalloc(NUM_SEL_MNT_OPTS, sizeof(int), GFP_ATOMIC);
953 if (!opts->mnt_opts_flags) {
954 kfree(opts->mnt_opts);
955 goto out_err;
956 }
957
958 if (fscontext) {
959 opts->mnt_opts[num_mnt_opts] = fscontext;
960 opts->mnt_opts_flags[num_mnt_opts++] = FSCONTEXT_MNT;
961 }
962 if (context) {
963 opts->mnt_opts[num_mnt_opts] = context;
964 opts->mnt_opts_flags[num_mnt_opts++] = CONTEXT_MNT;
965 }
966 if (rootcontext) {
967 opts->mnt_opts[num_mnt_opts] = rootcontext;
968 opts->mnt_opts_flags[num_mnt_opts++] = ROOTCONTEXT_MNT;
969 }
970 if (defcontext) {
971 opts->mnt_opts[num_mnt_opts] = defcontext;
972 opts->mnt_opts_flags[num_mnt_opts++] = DEFCONTEXT_MNT;
973 }
974
975 opts->num_mnt_opts = num_mnt_opts;
976 return 0;
977
978out_err:
979 kfree(context);
980 kfree(defcontext);
981 kfree(fscontext);
982 kfree(rootcontext);
983 return rc;
984}
985
986
987
988static int superblock_doinit(struct super_block *sb, void *data)
989{
990 int rc = 0;
991 char *options = data;
992 struct security_mnt_opts opts;
993
994 security_init_mnt_opts(&opts);
995
996 if (!data)
997 goto out;
998
999 BUG_ON(sb->s_type->fs_flags & FS_BINARY_MOUNTDATA);
1000
1001 rc = selinux_parse_opts_str(options, &opts);
1002 if (rc)
1003 goto out_err;
1004
1005out:
1006 rc = selinux_set_mnt_opts(sb, &opts, 0, NULL);
1007
1008out_err:
1009 security_free_mnt_opts(&opts);
1010 return rc;
1011}
1012
1013static void selinux_write_opts(struct seq_file *m,
1014 struct security_mnt_opts *opts)
1015{
1016 int i;
1017 char *prefix;
1018
1019 for (i = 0; i < opts->num_mnt_opts; i++) {
1020 char *has_comma;
1021
1022 if (opts->mnt_opts[i])
1023 has_comma = strchr(opts->mnt_opts[i], ',');
1024 else
1025 has_comma = NULL;
1026
1027 switch (opts->mnt_opts_flags[i]) {
1028 case CONTEXT_MNT:
1029 prefix = CONTEXT_STR;
1030 break;
1031 case FSCONTEXT_MNT:
1032 prefix = FSCONTEXT_STR;
1033 break;
1034 case ROOTCONTEXT_MNT:
1035 prefix = ROOTCONTEXT_STR;
1036 break;
1037 case DEFCONTEXT_MNT:
1038 prefix = DEFCONTEXT_STR;
1039 break;
1040 case SE_SBLABELSUPP:
1041 seq_putc(m, ',');
1042 seq_puts(m, LABELSUPP_STR);
1043 continue;
1044 default:
1045 BUG();
1046 return;
1047 };
1048
1049 seq_putc(m, ',');
1050 seq_puts(m, prefix);
1051 if (has_comma)
1052 seq_putc(m, '\"');
1053 seq_puts(m, opts->mnt_opts[i]);
1054 if (has_comma)
1055 seq_putc(m, '\"');
1056 }
1057}
1058
1059static int selinux_sb_show_options(struct seq_file *m, struct super_block *sb)
1060{
1061 struct security_mnt_opts opts;
1062 int rc;
1063
1064 rc = selinux_get_mnt_opts(sb, &opts);
1065 if (rc) {
1066
1067 if (rc == -EINVAL)
1068 rc = 0;
1069 return rc;
1070 }
1071
1072 selinux_write_opts(m, &opts);
1073
1074 security_free_mnt_opts(&opts);
1075
1076 return rc;
1077}
1078
1079static inline u16 inode_mode_to_security_class(umode_t mode)
1080{
1081 switch (mode & S_IFMT) {
1082 case S_IFSOCK:
1083 return SECCLASS_SOCK_FILE;
1084 case S_IFLNK:
1085 return SECCLASS_LNK_FILE;
1086 case S_IFREG:
1087 return SECCLASS_FILE;
1088 case S_IFBLK:
1089 return SECCLASS_BLK_FILE;
1090 case S_IFDIR:
1091 return SECCLASS_DIR;
1092 case S_IFCHR:
1093 return SECCLASS_CHR_FILE;
1094 case S_IFIFO:
1095 return SECCLASS_FIFO_FILE;
1096
1097 }
1098
1099 return SECCLASS_FILE;
1100}
1101
1102static inline int default_protocol_stream(int protocol)
1103{
1104 return (protocol == IPPROTO_IP || protocol == IPPROTO_TCP);
1105}
1106
1107static inline int default_protocol_dgram(int protocol)
1108{
1109 return (protocol == IPPROTO_IP || protocol == IPPROTO_UDP);
1110}
1111
1112static inline u16 socket_type_to_security_class(int family, int type, int protocol)
1113{
1114 switch (family) {
1115 case PF_UNIX:
1116 switch (type) {
1117 case SOCK_STREAM:
1118 case SOCK_SEQPACKET:
1119 return SECCLASS_UNIX_STREAM_SOCKET;
1120 case SOCK_DGRAM:
1121 return SECCLASS_UNIX_DGRAM_SOCKET;
1122 }
1123 break;
1124 case PF_INET:
1125 case PF_INET6:
1126 switch (type) {
1127 case SOCK_STREAM:
1128 if (default_protocol_stream(protocol))
1129 return SECCLASS_TCP_SOCKET;
1130 else
1131 return SECCLASS_RAWIP_SOCKET;
1132 case SOCK_DGRAM:
1133 if (default_protocol_dgram(protocol))
1134 return SECCLASS_UDP_SOCKET;
1135 else
1136 return SECCLASS_RAWIP_SOCKET;
1137 case SOCK_DCCP:
1138 return SECCLASS_DCCP_SOCKET;
1139 default:
1140 return SECCLASS_RAWIP_SOCKET;
1141 }
1142 break;
1143 case PF_NETLINK:
1144 switch (protocol) {
1145 case NETLINK_ROUTE:
1146 return SECCLASS_NETLINK_ROUTE_SOCKET;
1147 case NETLINK_FIREWALL:
1148 return SECCLASS_NETLINK_FIREWALL_SOCKET;
1149 case NETLINK_SOCK_DIAG:
1150 return SECCLASS_NETLINK_TCPDIAG_SOCKET;
1151 case NETLINK_NFLOG:
1152 return SECCLASS_NETLINK_NFLOG_SOCKET;
1153 case NETLINK_XFRM:
1154 return SECCLASS_NETLINK_XFRM_SOCKET;
1155 case NETLINK_SELINUX:
1156 return SECCLASS_NETLINK_SELINUX_SOCKET;
1157 case NETLINK_AUDIT:
1158 return SECCLASS_NETLINK_AUDIT_SOCKET;
1159 case NETLINK_IP6_FW:
1160 return SECCLASS_NETLINK_IP6FW_SOCKET;
1161 case NETLINK_DNRTMSG:
1162 return SECCLASS_NETLINK_DNRT_SOCKET;
1163 case NETLINK_KOBJECT_UEVENT:
1164 return SECCLASS_NETLINK_KOBJECT_UEVENT_SOCKET;
1165 default:
1166 return SECCLASS_NETLINK_SOCKET;
1167 }
1168 case PF_PACKET:
1169 return SECCLASS_PACKET_SOCKET;
1170 case PF_KEY:
1171 return SECCLASS_KEY_SOCKET;
1172 case PF_APPLETALK:
1173 return SECCLASS_APPLETALK_SOCKET;
1174 }
1175
1176 return SECCLASS_SOCKET;
1177}
1178
1179#ifdef CONFIG_PROC_FS
1180static int selinux_proc_get_sid(struct dentry *dentry,
1181 u16 tclass,
1182 u32 *sid)
1183{
1184 int rc;
1185 char *buffer, *path;
1186
1187 buffer = (char *)__get_free_page(GFP_KERNEL);
1188 if (!buffer)
1189 return -ENOMEM;
1190
1191 path = dentry_path_raw(dentry, buffer, PAGE_SIZE);
1192 if (IS_ERR(path))
1193 rc = PTR_ERR(path);
1194 else {
1195
1196
1197
1198 while (path[1] >= '0' && path[1] <= '9') {
1199 path[1] = '/';
1200 path++;
1201 }
1202 rc = security_genfs_sid("proc", path, tclass, sid);
1203 }
1204 free_page((unsigned long)buffer);
1205 return rc;
1206}
1207#else
1208static int selinux_proc_get_sid(struct dentry *dentry,
1209 u16 tclass,
1210 u32 *sid)
1211{
1212 return -EINVAL;
1213}
1214#endif
1215
1216
1217static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry)
1218{
1219 struct superblock_security_struct *sbsec = NULL;
1220 struct inode_security_struct *isec = inode->i_security;
1221 u32 sid;
1222 struct dentry *dentry;
1223#define INITCONTEXTLEN 255
1224 char *context = NULL;
1225 unsigned len = 0;
1226 int rc = 0;
1227
1228 if (isec->initialized)
1229 goto out;
1230
1231 mutex_lock(&isec->lock);
1232 if (isec->initialized)
1233 goto out_unlock;
1234
1235 sbsec = inode->i_sb->s_security;
1236 if (!(sbsec->flags & SE_SBINITIALIZED)) {
1237
1238
1239
1240 spin_lock(&sbsec->isec_lock);
1241 if (list_empty(&isec->list))
1242 list_add(&isec->list, &sbsec->isec_head);
1243 spin_unlock(&sbsec->isec_lock);
1244 goto out_unlock;
1245 }
1246
1247 switch (sbsec->behavior) {
1248 case SECURITY_FS_USE_NATIVE:
1249 break;
1250 case SECURITY_FS_USE_XATTR:
1251 if (!inode->i_op->getxattr) {
1252 isec->sid = sbsec->def_sid;
1253 break;
1254 }
1255
1256
1257
1258 if (opt_dentry) {
1259
1260 dentry = dget(opt_dentry);
1261 } else {
1262
1263 dentry = d_find_alias(inode);
1264 }
1265 if (!dentry) {
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275 goto out_unlock;
1276 }
1277
1278 len = INITCONTEXTLEN;
1279 context = kmalloc(len+1, GFP_NOFS);
1280 if (!context) {
1281 rc = -ENOMEM;
1282 dput(dentry);
1283 goto out_unlock;
1284 }
1285 context[len] = '\0';
1286 rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX,
1287 context, len);
1288 if (rc == -ERANGE) {
1289 kfree(context);
1290
1291
1292 rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX,
1293 NULL, 0);
1294 if (rc < 0) {
1295 dput(dentry);
1296 goto out_unlock;
1297 }
1298 len = rc;
1299 context = kmalloc(len+1, GFP_NOFS);
1300 if (!context) {
1301 rc = -ENOMEM;
1302 dput(dentry);
1303 goto out_unlock;
1304 }
1305 context[len] = '\0';
1306 rc = inode->i_op->getxattr(dentry,
1307 XATTR_NAME_SELINUX,
1308 context, len);
1309 }
1310 dput(dentry);
1311 if (rc < 0) {
1312 if (rc != -ENODATA) {
1313 printk(KERN_WARNING "SELinux: %s: getxattr returned "
1314 "%d for dev=%s ino=%ld\n", __func__,
1315 -rc, inode->i_sb->s_id, inode->i_ino);
1316 kfree(context);
1317 goto out_unlock;
1318 }
1319
1320 sid = sbsec->def_sid;
1321 rc = 0;
1322 } else {
1323 rc = security_context_to_sid_default(context, rc, &sid,
1324 sbsec->def_sid,
1325 GFP_NOFS);
1326 if (rc) {
1327 char *dev = inode->i_sb->s_id;
1328 unsigned long ino = inode->i_ino;
1329
1330 if (rc == -EINVAL) {
1331 if (printk_ratelimit())
1332 printk(KERN_NOTICE "SELinux: inode=%lu on dev=%s was found to have an invalid "
1333 "context=%s. This indicates you may need to relabel the inode or the "
1334 "filesystem in question.\n", ino, dev, context);
1335 } else {
1336 printk(KERN_WARNING "SELinux: %s: context_to_sid(%s) "
1337 "returned %d for dev=%s ino=%ld\n",
1338 __func__, context, -rc, dev, ino);
1339 }
1340 kfree(context);
1341
1342 rc = 0;
1343 break;
1344 }
1345 }
1346 kfree(context);
1347 isec->sid = sid;
1348 break;
1349 case SECURITY_FS_USE_TASK:
1350 isec->sid = isec->task_sid;
1351 break;
1352 case SECURITY_FS_USE_TRANS:
1353
1354 isec->sid = sbsec->sid;
1355
1356
1357 isec->sclass = inode_mode_to_security_class(inode->i_mode);
1358 rc = security_transition_sid(isec->task_sid, sbsec->sid,
1359 isec->sclass, NULL, &sid);
1360 if (rc)
1361 goto out_unlock;
1362 isec->sid = sid;
1363 break;
1364 case SECURITY_FS_USE_MNTPOINT:
1365 isec->sid = sbsec->mntpoint_sid;
1366 break;
1367 default:
1368
1369 isec->sid = sbsec->sid;
1370
1371 if ((sbsec->flags & SE_SBPROC) && !S_ISLNK(inode->i_mode)) {
1372 if (opt_dentry) {
1373 isec->sclass = inode_mode_to_security_class(inode->i_mode);
1374 rc = selinux_proc_get_sid(opt_dentry,
1375 isec->sclass,
1376 &sid);
1377 if (rc)
1378 goto out_unlock;
1379 isec->sid = sid;
1380 }
1381 }
1382 break;
1383 }
1384
1385 isec->initialized = 1;
1386
1387out_unlock:
1388 mutex_unlock(&isec->lock);
1389out:
1390 if (isec->sclass == SECCLASS_FILE)
1391 isec->sclass = inode_mode_to_security_class(inode->i_mode);
1392 return rc;
1393}
1394
1395
1396static inline u32 signal_to_av(int sig)
1397{
1398 u32 perm = 0;
1399
1400 switch (sig) {
1401 case SIGCHLD:
1402
1403 perm = PROCESS__SIGCHLD;
1404 break;
1405 case SIGKILL:
1406
1407 perm = PROCESS__SIGKILL;
1408 break;
1409 case SIGSTOP:
1410
1411 perm = PROCESS__SIGSTOP;
1412 break;
1413 default:
1414
1415 perm = PROCESS__SIGNAL;
1416 break;
1417 }
1418
1419 return perm;
1420}
1421
1422
1423
1424
1425
1426static int cred_has_perm(const struct cred *actor,
1427 const struct cred *target,
1428 u32 perms)
1429{
1430 u32 asid = cred_sid(actor), tsid = cred_sid(target);
1431
1432 return avc_has_perm(asid, tsid, SECCLASS_PROCESS, perms, NULL);
1433}
1434
1435
1436
1437
1438
1439
1440
1441static int task_has_perm(const struct task_struct *tsk1,
1442 const struct task_struct *tsk2,
1443 u32 perms)
1444{
1445 const struct task_security_struct *__tsec1, *__tsec2;
1446 u32 sid1, sid2;
1447
1448 rcu_read_lock();
1449 __tsec1 = __task_cred(tsk1)->security; sid1 = __tsec1->sid;
1450 __tsec2 = __task_cred(tsk2)->security; sid2 = __tsec2->sid;
1451 rcu_read_unlock();
1452 return avc_has_perm(sid1, sid2, SECCLASS_PROCESS, perms, NULL);
1453}
1454
1455
1456
1457
1458
1459
1460
1461static int current_has_perm(const struct task_struct *tsk,
1462 u32 perms)
1463{
1464 u32 sid, tsid;
1465
1466 sid = current_sid();
1467 tsid = task_sid(tsk);
1468 return avc_has_perm(sid, tsid, SECCLASS_PROCESS, perms, NULL);
1469}
1470
1471#if CAP_LAST_CAP > 63
1472#error Fix SELinux to handle capabilities > 63.
1473#endif
1474
1475
1476static int cred_has_capability(const struct cred *cred,
1477 int cap, int audit)
1478{
1479 struct common_audit_data ad;
1480 struct av_decision avd;
1481 u16 sclass;
1482 u32 sid = cred_sid(cred);
1483 u32 av = CAP_TO_MASK(cap);
1484 int rc;
1485
1486 ad.type = LSM_AUDIT_DATA_CAP;
1487 ad.u.cap = cap;
1488
1489 switch (CAP_TO_INDEX(cap)) {
1490 case 0:
1491 sclass = SECCLASS_CAPABILITY;
1492 break;
1493 case 1:
1494 sclass = SECCLASS_CAPABILITY2;
1495 break;
1496 default:
1497 printk(KERN_ERR
1498 "SELinux: out of range capability %d\n", cap);
1499 BUG();
1500 return -EINVAL;
1501 }
1502
1503 rc = avc_has_perm_noaudit(sid, sid, sclass, av, 0, &avd);
1504 if (audit == SECURITY_CAP_AUDIT) {
1505 int rc2 = avc_audit(sid, sid, sclass, av, &avd, rc, &ad);
1506 if (rc2)
1507 return rc2;
1508 }
1509 return rc;
1510}
1511
1512
1513static int task_has_system(struct task_struct *tsk,
1514 u32 perms)
1515{
1516 u32 sid = task_sid(tsk);
1517
1518 return avc_has_perm(sid, SECINITSID_KERNEL,
1519 SECCLASS_SYSTEM, perms, NULL);
1520}
1521
1522
1523
1524
1525static int inode_has_perm(const struct cred *cred,
1526 struct inode *inode,
1527 u32 perms,
1528 struct common_audit_data *adp)
1529{
1530 struct inode_security_struct *isec;
1531 u32 sid;
1532
1533 validate_creds(cred);
1534
1535 if (unlikely(IS_PRIVATE(inode)))
1536 return 0;
1537
1538 sid = cred_sid(cred);
1539 isec = inode->i_security;
1540
1541 return avc_has_perm(sid, isec->sid, isec->sclass, perms, adp);
1542}
1543
1544
1545
1546
1547static inline int dentry_has_perm(const struct cred *cred,
1548 struct dentry *dentry,
1549 u32 av)
1550{
1551 struct inode *inode = dentry->d_inode;
1552 struct common_audit_data ad;
1553
1554 ad.type = LSM_AUDIT_DATA_DENTRY;
1555 ad.u.dentry = dentry;
1556 return inode_has_perm(cred, inode, av, &ad);
1557}
1558
1559
1560
1561
1562static inline int path_has_perm(const struct cred *cred,
1563 struct path *path,
1564 u32 av)
1565{
1566 struct inode *inode = path->dentry->d_inode;
1567 struct common_audit_data ad;
1568
1569 ad.type = LSM_AUDIT_DATA_PATH;
1570 ad.u.path = *path;
1571 return inode_has_perm(cred, inode, av, &ad);
1572}
1573
1574
1575static inline int file_path_has_perm(const struct cred *cred,
1576 struct file *file,
1577 u32 av)
1578{
1579 struct common_audit_data ad;
1580
1581 ad.type = LSM_AUDIT_DATA_PATH;
1582 ad.u.path = file->f_path;
1583 return inode_has_perm(cred, file_inode(file), av, &ad);
1584}
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594static int file_has_perm(const struct cred *cred,
1595 struct file *file,
1596 u32 av)
1597{
1598 struct file_security_struct *fsec = file->f_security;
1599 struct inode *inode = file_inode(file);
1600 struct common_audit_data ad;
1601 u32 sid = cred_sid(cred);
1602 int rc;
1603
1604 ad.type = LSM_AUDIT_DATA_PATH;
1605 ad.u.path = file->f_path;
1606
1607 if (sid != fsec->sid) {
1608 rc = avc_has_perm(sid, fsec->sid,
1609 SECCLASS_FD,
1610 FD__USE,
1611 &ad);
1612 if (rc)
1613 goto out;
1614 }
1615
1616
1617 rc = 0;
1618 if (av)
1619 rc = inode_has_perm(cred, inode, av, &ad);
1620
1621out:
1622 return rc;
1623}
1624
1625
1626static int may_create(struct inode *dir,
1627 struct dentry *dentry,
1628 u16 tclass)
1629{
1630 const struct task_security_struct *tsec = current_security();
1631 struct inode_security_struct *dsec;
1632 struct superblock_security_struct *sbsec;
1633 u32 sid, newsid;
1634 struct common_audit_data ad;
1635 int rc;
1636
1637 dsec = dir->i_security;
1638 sbsec = dir->i_sb->s_security;
1639
1640 sid = tsec->sid;
1641 newsid = tsec->create_sid;
1642
1643 ad.type = LSM_AUDIT_DATA_DENTRY;
1644 ad.u.dentry = dentry;
1645
1646 rc = avc_has_perm(sid, dsec->sid, SECCLASS_DIR,
1647 DIR__ADD_NAME | DIR__SEARCH,
1648 &ad);
1649 if (rc)
1650 return rc;
1651
1652 if (!newsid || !(sbsec->flags & SE_SBLABELSUPP)) {
1653 rc = security_transition_sid(sid, dsec->sid, tclass,
1654 &dentry->d_name, &newsid);
1655 if (rc)
1656 return rc;
1657 }
1658
1659 rc = avc_has_perm(sid, newsid, tclass, FILE__CREATE, &ad);
1660 if (rc)
1661 return rc;
1662
1663 return avc_has_perm(newsid, sbsec->sid,
1664 SECCLASS_FILESYSTEM,
1665 FILESYSTEM__ASSOCIATE, &ad);
1666}
1667
1668
1669static int may_create_key(u32 ksid,
1670 struct task_struct *ctx)
1671{
1672 u32 sid = task_sid(ctx);
1673
1674 return avc_has_perm(sid, ksid, SECCLASS_KEY, KEY__CREATE, NULL);
1675}
1676
1677#define MAY_LINK 0
1678#define MAY_UNLINK 1
1679#define MAY_RMDIR 2
1680
1681
1682static int may_link(struct inode *dir,
1683 struct dentry *dentry,
1684 int kind)
1685
1686{
1687 struct inode_security_struct *dsec, *isec;
1688 struct common_audit_data ad;
1689 u32 sid = current_sid();
1690 u32 av;
1691 int rc;
1692
1693 dsec = dir->i_security;
1694 isec = dentry->d_inode->i_security;
1695
1696 ad.type = LSM_AUDIT_DATA_DENTRY;
1697 ad.u.dentry = dentry;
1698
1699 av = DIR__SEARCH;
1700 av |= (kind ? DIR__REMOVE_NAME : DIR__ADD_NAME);
1701 rc = avc_has_perm(sid, dsec->sid, SECCLASS_DIR, av, &ad);
1702 if (rc)
1703 return rc;
1704
1705 switch (kind) {
1706 case MAY_LINK:
1707 av = FILE__LINK;
1708 break;
1709 case MAY_UNLINK:
1710 av = FILE__UNLINK;
1711 break;
1712 case MAY_RMDIR:
1713 av = DIR__RMDIR;
1714 break;
1715 default:
1716 printk(KERN_WARNING "SELinux: %s: unrecognized kind %d\n",
1717 __func__, kind);
1718 return 0;
1719 }
1720
1721 rc = avc_has_perm(sid, isec->sid, isec->sclass, av, &ad);
1722 return rc;
1723}
1724
1725static inline int may_rename(struct inode *old_dir,
1726 struct dentry *old_dentry,
1727 struct inode *new_dir,
1728 struct dentry *new_dentry)
1729{
1730 struct inode_security_struct *old_dsec, *new_dsec, *old_isec, *new_isec;
1731 struct common_audit_data ad;
1732 u32 sid = current_sid();
1733 u32 av;
1734 int old_is_dir, new_is_dir;
1735 int rc;
1736
1737 old_dsec = old_dir->i_security;
1738 old_isec = old_dentry->d_inode->i_security;
1739 old_is_dir = S_ISDIR(old_dentry->d_inode->i_mode);
1740 new_dsec = new_dir->i_security;
1741
1742 ad.type = LSM_AUDIT_DATA_DENTRY;
1743
1744 ad.u.dentry = old_dentry;
1745 rc = avc_has_perm(sid, old_dsec->sid, SECCLASS_DIR,
1746 DIR__REMOVE_NAME | DIR__SEARCH, &ad);
1747 if (rc)
1748 return rc;
1749 rc = avc_has_perm(sid, old_isec->sid,
1750 old_isec->sclass, FILE__RENAME, &ad);
1751 if (rc)
1752 return rc;
1753 if (old_is_dir && new_dir != old_dir) {
1754 rc = avc_has_perm(sid, old_isec->sid,
1755 old_isec->sclass, DIR__REPARENT, &ad);
1756 if (rc)
1757 return rc;
1758 }
1759
1760 ad.u.dentry = new_dentry;
1761 av = DIR__ADD_NAME | DIR__SEARCH;
1762 if (new_dentry->d_inode)
1763 av |= DIR__REMOVE_NAME;
1764 rc = avc_has_perm(sid, new_dsec->sid, SECCLASS_DIR, av, &ad);
1765 if (rc)
1766 return rc;
1767 if (new_dentry->d_inode) {
1768 new_isec = new_dentry->d_inode->i_security;
1769 new_is_dir = S_ISDIR(new_dentry->d_inode->i_mode);
1770 rc = avc_has_perm(sid, new_isec->sid,
1771 new_isec->sclass,
1772 (new_is_dir ? DIR__RMDIR : FILE__UNLINK), &ad);
1773 if (rc)
1774 return rc;
1775 }
1776
1777 return 0;
1778}
1779
1780
1781static int superblock_has_perm(const struct cred *cred,
1782 struct super_block *sb,
1783 u32 perms,
1784 struct common_audit_data *ad)
1785{
1786 struct superblock_security_struct *sbsec;
1787 u32 sid = cred_sid(cred);
1788
1789 sbsec = sb->s_security;
1790 return avc_has_perm(sid, sbsec->sid, SECCLASS_FILESYSTEM, perms, ad);
1791}
1792
1793
1794static inline u32 file_mask_to_av(int mode, int mask)
1795{
1796 u32 av = 0;
1797
1798 if (!S_ISDIR(mode)) {
1799 if (mask & MAY_EXEC)
1800 av |= FILE__EXECUTE;
1801 if (mask & MAY_READ)
1802 av |= FILE__READ;
1803
1804 if (mask & MAY_APPEND)
1805 av |= FILE__APPEND;
1806 else if (mask & MAY_WRITE)
1807 av |= FILE__WRITE;
1808
1809 } else {
1810 if (mask & MAY_EXEC)
1811 av |= DIR__SEARCH;
1812 if (mask & MAY_WRITE)
1813 av |= DIR__WRITE;
1814 if (mask & MAY_READ)
1815 av |= DIR__READ;
1816 }
1817
1818 return av;
1819}
1820
1821
1822static inline u32 file_to_av(struct file *file)
1823{
1824 u32 av = 0;
1825
1826 if (file->f_mode & FMODE_READ)
1827 av |= FILE__READ;
1828 if (file->f_mode & FMODE_WRITE) {
1829 if (file->f_flags & O_APPEND)
1830 av |= FILE__APPEND;
1831 else
1832 av |= FILE__WRITE;
1833 }
1834 if (!av) {
1835
1836
1837
1838 av = FILE__IOCTL;
1839 }
1840
1841 return av;
1842}
1843
1844
1845
1846
1847
1848static inline u32 open_file_to_av(struct file *file)
1849{
1850 u32 av = file_to_av(file);
1851
1852 if (selinux_policycap_openperm)
1853 av |= FILE__OPEN;
1854
1855 return av;
1856}
1857
1858
1859
1860static int selinux_ptrace_access_check(struct task_struct *child,
1861 unsigned int mode)
1862{
1863 int rc;
1864
1865 rc = cap_ptrace_access_check(child, mode);
1866 if (rc)
1867 return rc;
1868
1869 if (mode & PTRACE_MODE_READ) {
1870 u32 sid = current_sid();
1871 u32 csid = task_sid(child);
1872 return avc_has_perm(sid, csid, SECCLASS_FILE, FILE__READ, NULL);
1873 }
1874
1875 return current_has_perm(child, PROCESS__PTRACE);
1876}
1877
1878static int selinux_ptrace_traceme(struct task_struct *parent)
1879{
1880 int rc;
1881
1882 rc = cap_ptrace_traceme(parent);
1883 if (rc)
1884 return rc;
1885
1886 return task_has_perm(parent, current, PROCESS__PTRACE);
1887}
1888
1889static int selinux_capget(struct task_struct *target, kernel_cap_t *effective,
1890 kernel_cap_t *inheritable, kernel_cap_t *permitted)
1891{
1892 int error;
1893
1894 error = current_has_perm(target, PROCESS__GETCAP);
1895 if (error)
1896 return error;
1897
1898 return cap_capget(target, effective, inheritable, permitted);
1899}
1900
1901static int selinux_capset(struct cred *new, const struct cred *old,
1902 const kernel_cap_t *effective,
1903 const kernel_cap_t *inheritable,
1904 const kernel_cap_t *permitted)
1905{
1906 int error;
1907
1908 error = cap_capset(new, old,
1909 effective, inheritable, permitted);
1910 if (error)
1911 return error;
1912
1913 return cred_has_perm(old, new, PROCESS__SETCAP);
1914}
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926static int selinux_capable(const struct cred *cred, struct user_namespace *ns,
1927 int cap, int audit)
1928{
1929 int rc;
1930
1931 rc = cap_capable(cred, ns, cap, audit);
1932 if (rc)
1933 return rc;
1934
1935 return cred_has_capability(cred, cap, audit);
1936}
1937
1938static int selinux_quotactl(int cmds, int type, int id, struct super_block *sb)
1939{
1940 const struct cred *cred = current_cred();
1941 int rc = 0;
1942
1943 if (!sb)
1944 return 0;
1945
1946 switch (cmds) {
1947 case Q_SYNC:
1948 case Q_QUOTAON:
1949 case Q_QUOTAOFF:
1950 case Q_SETINFO:
1951 case Q_SETQUOTA:
1952 rc = superblock_has_perm(cred, sb, FILESYSTEM__QUOTAMOD, NULL);
1953 break;
1954 case Q_GETFMT:
1955 case Q_GETINFO:
1956 case Q_GETQUOTA:
1957 rc = superblock_has_perm(cred, sb, FILESYSTEM__QUOTAGET, NULL);
1958 break;
1959 default:
1960 rc = 0;
1961 break;
1962 }
1963 return rc;
1964}
1965
1966static int selinux_quota_on(struct dentry *dentry)
1967{
1968 const struct cred *cred = current_cred();
1969
1970 return dentry_has_perm(cred, dentry, FILE__QUOTAON);
1971}
1972
1973static int selinux_syslog(int type)
1974{
1975 int rc;
1976
1977 switch (type) {
1978 case SYSLOG_ACTION_READ_ALL:
1979 case SYSLOG_ACTION_SIZE_BUFFER:
1980 rc = task_has_system(current, SYSTEM__SYSLOG_READ);
1981 break;
1982 case SYSLOG_ACTION_CONSOLE_OFF:
1983 case SYSLOG_ACTION_CONSOLE_ON:
1984
1985 case SYSLOG_ACTION_CONSOLE_LEVEL:
1986 rc = task_has_system(current, SYSTEM__SYSLOG_CONSOLE);
1987 break;
1988 case SYSLOG_ACTION_CLOSE:
1989 case SYSLOG_ACTION_OPEN:
1990 case SYSLOG_ACTION_READ:
1991 case SYSLOG_ACTION_READ_CLEAR:
1992 case SYSLOG_ACTION_CLEAR:
1993 default:
1994 rc = task_has_system(current, SYSTEM__SYSLOG_MOD);
1995 break;
1996 }
1997 return rc;
1998}
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008static int selinux_vm_enough_memory(struct mm_struct *mm, long pages)
2009{
2010 int rc, cap_sys_admin = 0;
2011
2012 rc = selinux_capable(current_cred(), &init_user_ns, CAP_SYS_ADMIN,
2013 SECURITY_CAP_NOAUDIT);
2014 if (rc == 0)
2015 cap_sys_admin = 1;
2016
2017 return __vm_enough_memory(mm, pages, cap_sys_admin);
2018}
2019
2020
2021
2022static int selinux_bprm_set_creds(struct linux_binprm *bprm)
2023{
2024 const struct task_security_struct *old_tsec;
2025 struct task_security_struct *new_tsec;
2026 struct inode_security_struct *isec;
2027 struct common_audit_data ad;
2028 struct inode *inode = file_inode(bprm->file);
2029 int rc;
2030
2031 rc = cap_bprm_set_creds(bprm);
2032 if (rc)
2033 return rc;
2034
2035
2036
2037 if (bprm->cred_prepared)
2038 return 0;
2039
2040 old_tsec = current_security();
2041 new_tsec = bprm->cred->security;
2042 isec = inode->i_security;
2043
2044
2045 new_tsec->sid = old_tsec->sid;
2046 new_tsec->osid = old_tsec->sid;
2047
2048
2049 new_tsec->create_sid = 0;
2050 new_tsec->keycreate_sid = 0;
2051 new_tsec->sockcreate_sid = 0;
2052
2053 if (old_tsec->exec_sid) {
2054 new_tsec->sid = old_tsec->exec_sid;
2055
2056 new_tsec->exec_sid = 0;
2057
2058
2059
2060
2061
2062 if (bprm->unsafe & LSM_UNSAFE_NO_NEW_PRIVS)
2063 return -EPERM;
2064 } else {
2065
2066 rc = security_transition_sid(old_tsec->sid, isec->sid,
2067 SECCLASS_PROCESS, NULL,
2068 &new_tsec->sid);
2069 if (rc)
2070 return rc;
2071 }
2072
2073 ad.type = LSM_AUDIT_DATA_PATH;
2074 ad.u.path = bprm->file->f_path;
2075
2076 if ((bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID) ||
2077 (bprm->unsafe & LSM_UNSAFE_NO_NEW_PRIVS))
2078 new_tsec->sid = old_tsec->sid;
2079
2080 if (new_tsec->sid == old_tsec->sid) {
2081 rc = avc_has_perm(old_tsec->sid, isec->sid,
2082 SECCLASS_FILE, FILE__EXECUTE_NO_TRANS, &ad);
2083 if (rc)
2084 return rc;
2085 } else {
2086
2087 rc = avc_has_perm(old_tsec->sid, new_tsec->sid,
2088 SECCLASS_PROCESS, PROCESS__TRANSITION, &ad);
2089 if (rc)
2090 return rc;
2091
2092 rc = avc_has_perm(new_tsec->sid, isec->sid,
2093 SECCLASS_FILE, FILE__ENTRYPOINT, &ad);
2094 if (rc)
2095 return rc;
2096
2097
2098 if (bprm->unsafe & LSM_UNSAFE_SHARE) {
2099 rc = avc_has_perm(old_tsec->sid, new_tsec->sid,
2100 SECCLASS_PROCESS, PROCESS__SHARE,
2101 NULL);
2102 if (rc)
2103 return -EPERM;
2104 }
2105
2106
2107
2108 if (bprm->unsafe &
2109 (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) {
2110 struct task_struct *tracer;
2111 struct task_security_struct *sec;
2112 u32 ptsid = 0;
2113
2114 rcu_read_lock();
2115 tracer = ptrace_parent(current);
2116 if (likely(tracer != NULL)) {
2117 sec = __task_cred(tracer)->security;
2118 ptsid = sec->sid;
2119 }
2120 rcu_read_unlock();
2121
2122 if (ptsid != 0) {
2123 rc = avc_has_perm(ptsid, new_tsec->sid,
2124 SECCLASS_PROCESS,
2125 PROCESS__PTRACE, NULL);
2126 if (rc)
2127 return -EPERM;
2128 }
2129 }
2130
2131
2132 bprm->per_clear |= PER_CLEAR_ON_SETID;
2133 }
2134
2135 return 0;
2136}
2137
2138static int selinux_bprm_secureexec(struct linux_binprm *bprm)
2139{
2140 const struct task_security_struct *tsec = current_security();
2141 u32 sid, osid;
2142 int atsecure = 0;
2143
2144 sid = tsec->sid;
2145 osid = tsec->osid;
2146
2147 if (osid != sid) {
2148
2149
2150
2151 atsecure = avc_has_perm(osid, sid,
2152 SECCLASS_PROCESS,
2153 PROCESS__NOATSECURE, NULL);
2154 }
2155
2156 return (atsecure || cap_bprm_secureexec(bprm));
2157}
2158
2159static int match_file(const void *p, struct file *file, unsigned fd)
2160{
2161 return file_has_perm(p, file, file_to_av(file)) ? fd + 1 : 0;
2162}
2163
2164
2165static inline void flush_unauthorized_files(const struct cred *cred,
2166 struct files_struct *files)
2167{
2168 struct file *file, *devnull = NULL;
2169 struct tty_struct *tty;
2170 int drop_tty = 0;
2171 unsigned n;
2172
2173 tty = get_current_tty();
2174 if (tty) {
2175 spin_lock(&tty_files_lock);
2176 if (!list_empty(&tty->tty_files)) {
2177 struct tty_file_private *file_priv;
2178
2179
2180
2181
2182
2183
2184 file_priv = list_first_entry(&tty->tty_files,
2185 struct tty_file_private, list);
2186 file = file_priv->file;
2187 if (file_path_has_perm(cred, file, FILE__READ | FILE__WRITE))
2188 drop_tty = 1;
2189 }
2190 spin_unlock(&tty_files_lock);
2191 tty_kref_put(tty);
2192 }
2193
2194 if (drop_tty)
2195 no_tty();
2196
2197
2198 n = iterate_fd(files, 0, match_file, cred);
2199 if (!n)
2200 return;
2201
2202 devnull = dentry_open(&selinux_null, O_RDWR, cred);
2203 if (IS_ERR(devnull))
2204 devnull = NULL;
2205
2206 do {
2207 replace_fd(n - 1, devnull, 0);
2208 } while ((n = iterate_fd(files, n, match_file, cred)) != 0);
2209 if (devnull)
2210 fput(devnull);
2211}
2212
2213
2214
2215
2216static void selinux_bprm_committing_creds(struct linux_binprm *bprm)
2217{
2218 struct task_security_struct *new_tsec;
2219 struct rlimit *rlim, *initrlim;
2220 int rc, i;
2221
2222 new_tsec = bprm->cred->security;
2223 if (new_tsec->sid == new_tsec->osid)
2224 return;
2225
2226
2227 flush_unauthorized_files(bprm->cred, current->files);
2228
2229
2230 current->pdeath_signal = 0;
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242 rc = avc_has_perm(new_tsec->osid, new_tsec->sid, SECCLASS_PROCESS,
2243 PROCESS__RLIMITINH, NULL);
2244 if (rc) {
2245
2246 task_lock(current);
2247 for (i = 0; i < RLIM_NLIMITS; i++) {
2248 rlim = current->signal->rlim + i;
2249 initrlim = init_task.signal->rlim + i;
2250 rlim->rlim_cur = min(rlim->rlim_max, initrlim->rlim_cur);
2251 }
2252 task_unlock(current);
2253 update_rlimit_cpu(current, rlimit(RLIMIT_CPU));
2254 }
2255}
2256
2257
2258
2259
2260
2261static void selinux_bprm_committed_creds(struct linux_binprm *bprm)
2262{
2263 const struct task_security_struct *tsec = current_security();
2264 struct itimerval itimer;
2265 u32 osid, sid;
2266 int rc, i;
2267
2268 osid = tsec->osid;
2269 sid = tsec->sid;
2270
2271 if (sid == osid)
2272 return;
2273
2274
2275
2276
2277
2278
2279
2280
2281 rc = avc_has_perm(osid, sid, SECCLASS_PROCESS, PROCESS__SIGINH, NULL);
2282 if (rc) {
2283 memset(&itimer, 0, sizeof itimer);
2284 for (i = 0; i < 3; i++)
2285 do_setitimer(i, &itimer, NULL);
2286 spin_lock_irq(¤t->sighand->siglock);
2287 if (!(current->signal->flags & SIGNAL_GROUP_EXIT)) {
2288 __flush_signals(current);
2289 flush_signal_handlers(current, 1);
2290 sigemptyset(¤t->blocked);
2291 }
2292 spin_unlock_irq(¤t->sighand->siglock);
2293 }
2294
2295
2296
2297 read_lock(&tasklist_lock);
2298 __wake_up_parent(current, current->real_parent);
2299 read_unlock(&tasklist_lock);
2300}
2301
2302
2303
2304static int selinux_sb_alloc_security(struct super_block *sb)
2305{
2306 return superblock_alloc_security(sb);
2307}
2308
2309static void selinux_sb_free_security(struct super_block *sb)
2310{
2311 superblock_free_security(sb);
2312}
2313
2314static inline int match_prefix(char *prefix, int plen, char *option, int olen)
2315{
2316 if (plen > olen)
2317 return 0;
2318
2319 return !memcmp(prefix, option, plen);
2320}
2321
2322static inline int selinux_option(char *option, int len)
2323{
2324 return (match_prefix(CONTEXT_STR, sizeof(CONTEXT_STR)-1, option, len) ||
2325 match_prefix(FSCONTEXT_STR, sizeof(FSCONTEXT_STR)-1, option, len) ||
2326 match_prefix(DEFCONTEXT_STR, sizeof(DEFCONTEXT_STR)-1, option, len) ||
2327 match_prefix(ROOTCONTEXT_STR, sizeof(ROOTCONTEXT_STR)-1, option, len) ||
2328 match_prefix(LABELSUPP_STR, sizeof(LABELSUPP_STR)-1, option, len));
2329}
2330
2331static inline void take_option(char **to, char *from, int *first, int len)
2332{
2333 if (!*first) {
2334 **to = ',';
2335 *to += 1;
2336 } else
2337 *first = 0;
2338 memcpy(*to, from, len);
2339 *to += len;
2340}
2341
2342static inline void take_selinux_option(char **to, char *from, int *first,
2343 int len)
2344{
2345 int current_size = 0;
2346
2347 if (!*first) {
2348 **to = '|';
2349 *to += 1;
2350 } else
2351 *first = 0;
2352
2353 while (current_size < len) {
2354 if (*from != '"') {
2355 **to = *from;
2356 *to += 1;
2357 }
2358 from += 1;
2359 current_size += 1;
2360 }
2361}
2362
2363static int selinux_sb_copy_data(char *orig, char *copy)
2364{
2365 int fnosec, fsec, rc = 0;
2366 char *in_save, *in_curr, *in_end;
2367 char *sec_curr, *nosec_save, *nosec;
2368 int open_quote = 0;
2369
2370 in_curr = orig;
2371 sec_curr = copy;
2372
2373 nosec = (char *)get_zeroed_page(GFP_KERNEL);
2374 if (!nosec) {
2375 rc = -ENOMEM;
2376 goto out;
2377 }
2378
2379 nosec_save = nosec;
2380 fnosec = fsec = 1;
2381 in_save = in_end = orig;
2382
2383 do {
2384 if (*in_end == '"')
2385 open_quote = !open_quote;
2386 if ((*in_end == ',' && open_quote == 0) ||
2387 *in_end == '\0') {
2388 int len = in_end - in_curr;
2389
2390 if (selinux_option(in_curr, len))
2391 take_selinux_option(&sec_curr, in_curr, &fsec, len);
2392 else
2393 take_option(&nosec, in_curr, &fnosec, len);
2394
2395 in_curr = in_end + 1;
2396 }
2397 } while (*in_end++);
2398
2399 strcpy(in_save, nosec_save);
2400 free_page((unsigned long)nosec_save);
2401out:
2402 return rc;
2403}
2404
2405static int selinux_sb_remount(struct super_block *sb, void *data)
2406{
2407 int rc, i, *flags;
2408 struct security_mnt_opts opts;
2409 char *secdata, **mount_options;
2410 struct superblock_security_struct *sbsec = sb->s_security;
2411
2412 if (!(sbsec->flags & SE_SBINITIALIZED))
2413 return 0;
2414
2415 if (!data)
2416 return 0;
2417
2418 if (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA)
2419 return 0;
2420
2421 security_init_mnt_opts(&opts);
2422 secdata = alloc_secdata();
2423 if (!secdata)
2424 return -ENOMEM;
2425 rc = selinux_sb_copy_data(data, secdata);
2426 if (rc)
2427 goto out_free_secdata;
2428
2429 rc = selinux_parse_opts_str(secdata, &opts);
2430 if (rc)
2431 goto out_free_secdata;
2432
2433 mount_options = opts.mnt_opts;
2434 flags = opts.mnt_opts_flags;
2435
2436 for (i = 0; i < opts.num_mnt_opts; i++) {
2437 u32 sid;
2438 size_t len;
2439
2440 if (flags[i] == SE_SBLABELSUPP)
2441 continue;
2442 len = strlen(mount_options[i]);
2443 rc = security_context_to_sid(mount_options[i], len, &sid);
2444 if (rc) {
2445 printk(KERN_WARNING "SELinux: security_context_to_sid"
2446 "(%s) failed for (dev %s, type %s) errno=%d\n",
2447 mount_options[i], sb->s_id, sb->s_type->name, rc);
2448 goto out_free_opts;
2449 }
2450 rc = -EINVAL;
2451 switch (flags[i]) {
2452 case FSCONTEXT_MNT:
2453 if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid, sid))
2454 goto out_bad_option;
2455 break;
2456 case CONTEXT_MNT:
2457 if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid, sid))
2458 goto out_bad_option;
2459 break;
2460 case ROOTCONTEXT_MNT: {
2461 struct inode_security_struct *root_isec;
2462 root_isec = sb->s_root->d_inode->i_security;
2463
2464 if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid, sid))
2465 goto out_bad_option;
2466 break;
2467 }
2468 case DEFCONTEXT_MNT:
2469 if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid, sid))
2470 goto out_bad_option;
2471 break;
2472 default:
2473 goto out_free_opts;
2474 }
2475 }
2476
2477 rc = 0;
2478out_free_opts:
2479 security_free_mnt_opts(&opts);
2480out_free_secdata:
2481 free_secdata(secdata);
2482 return rc;
2483out_bad_option:
2484 printk(KERN_WARNING "SELinux: unable to change security options "
2485 "during remount (dev %s, type=%s)\n", sb->s_id,
2486 sb->s_type->name);
2487 goto out_free_opts;
2488}
2489
2490static int selinux_sb_kern_mount(struct super_block *sb, int flags, void *data)
2491{
2492 const struct cred *cred = current_cred();
2493 struct common_audit_data ad;
2494 int rc;
2495
2496 rc = superblock_doinit(sb, data);
2497 if (rc)
2498 return rc;
2499
2500
2501 if (flags & MS_KERNMOUNT)
2502 return 0;
2503
2504 ad.type = LSM_AUDIT_DATA_DENTRY;
2505 ad.u.dentry = sb->s_root;
2506 return superblock_has_perm(cred, sb, FILESYSTEM__MOUNT, &ad);
2507}
2508
2509static int selinux_sb_statfs(struct dentry *dentry)
2510{
2511 const struct cred *cred = current_cred();
2512 struct common_audit_data ad;
2513
2514 ad.type = LSM_AUDIT_DATA_DENTRY;
2515 ad.u.dentry = dentry->d_sb->s_root;
2516 return superblock_has_perm(cred, dentry->d_sb, FILESYSTEM__GETATTR, &ad);
2517}
2518
2519static int selinux_mount(const char *dev_name,
2520 struct path *path,
2521 const char *type,
2522 unsigned long flags,
2523 void *data)
2524{
2525 const struct cred *cred = current_cred();
2526
2527 if (flags & MS_REMOUNT)
2528 return superblock_has_perm(cred, path->dentry->d_sb,
2529 FILESYSTEM__REMOUNT, NULL);
2530 else
2531 return path_has_perm(cred, path, FILE__MOUNTON);
2532}
2533
2534static int selinux_umount(struct vfsmount *mnt, int flags)
2535{
2536 const struct cred *cred = current_cred();
2537
2538 return superblock_has_perm(cred, mnt->mnt_sb,
2539 FILESYSTEM__UNMOUNT, NULL);
2540}
2541
2542
2543
2544static int selinux_inode_alloc_security(struct inode *inode)
2545{
2546 return inode_alloc_security(inode);
2547}
2548
2549static void selinux_inode_free_security(struct inode *inode)
2550{
2551 inode_free_security(inode);
2552}
2553
2554static int selinux_dentry_init_security(struct dentry *dentry, int mode,
2555 struct qstr *name, void **ctx,
2556 u32 *ctxlen)
2557{
2558 const struct cred *cred = current_cred();
2559 struct task_security_struct *tsec;
2560 struct inode_security_struct *dsec;
2561 struct superblock_security_struct *sbsec;
2562 struct inode *dir = dentry->d_parent->d_inode;
2563 u32 newsid;
2564 int rc;
2565
2566 tsec = cred->security;
2567 dsec = dir->i_security;
2568 sbsec = dir->i_sb->s_security;
2569
2570 if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) {
2571 newsid = tsec->create_sid;
2572 } else {
2573 rc = security_transition_sid(tsec->sid, dsec->sid,
2574 inode_mode_to_security_class(mode),
2575 name,
2576 &newsid);
2577 if (rc) {
2578 printk(KERN_WARNING
2579 "%s: security_transition_sid failed, rc=%d\n",
2580 __func__, -rc);
2581 return rc;
2582 }
2583 }
2584
2585 return security_sid_to_context(newsid, (char **)ctx, ctxlen);
2586}
2587
2588static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
2589 const struct qstr *qstr,
2590 const char **name,
2591 void **value, size_t *len)
2592{
2593 const struct task_security_struct *tsec = current_security();
2594 struct inode_security_struct *dsec;
2595 struct superblock_security_struct *sbsec;
2596 u32 sid, newsid, clen;
2597 int rc;
2598 char *context;
2599
2600 dsec = dir->i_security;
2601 sbsec = dir->i_sb->s_security;
2602
2603 sid = tsec->sid;
2604 newsid = tsec->create_sid;
2605
2606 if ((sbsec->flags & SE_SBINITIALIZED) &&
2607 (sbsec->behavior == SECURITY_FS_USE_MNTPOINT))
2608 newsid = sbsec->mntpoint_sid;
2609 else if (!newsid || !(sbsec->flags & SE_SBLABELSUPP)) {
2610 rc = security_transition_sid(sid, dsec->sid,
2611 inode_mode_to_security_class(inode->i_mode),
2612 qstr, &newsid);
2613 if (rc) {
2614 printk(KERN_WARNING "%s: "
2615 "security_transition_sid failed, rc=%d (dev=%s "
2616 "ino=%ld)\n",
2617 __func__,
2618 -rc, inode->i_sb->s_id, inode->i_ino);
2619 return rc;
2620 }
2621 }
2622
2623
2624 if (sbsec->flags & SE_SBINITIALIZED) {
2625 struct inode_security_struct *isec = inode->i_security;
2626 isec->sclass = inode_mode_to_security_class(inode->i_mode);
2627 isec->sid = newsid;
2628 isec->initialized = 1;
2629 }
2630
2631 if (!ss_initialized || !(sbsec->flags & SE_SBLABELSUPP))
2632 return -EOPNOTSUPP;
2633
2634 if (name)
2635 *name = XATTR_SELINUX_SUFFIX;
2636
2637 if (value && len) {
2638 rc = security_sid_to_context_force(newsid, &context, &clen);
2639 if (rc)
2640 return rc;
2641 *value = context;
2642 *len = clen;
2643 }
2644
2645 return 0;
2646}
2647
2648static int selinux_inode_create(struct inode *dir, struct dentry *dentry, umode_t mode)
2649{
2650 return may_create(dir, dentry, SECCLASS_FILE);
2651}
2652
2653static int selinux_inode_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry)
2654{
2655 return may_link(dir, old_dentry, MAY_LINK);
2656}
2657
2658static int selinux_inode_unlink(struct inode *dir, struct dentry *dentry)
2659{
2660 return may_link(dir, dentry, MAY_UNLINK);
2661}
2662
2663static int selinux_inode_symlink(struct inode *dir, struct dentry *dentry, const char *name)
2664{
2665 return may_create(dir, dentry, SECCLASS_LNK_FILE);
2666}
2667
2668static int selinux_inode_mkdir(struct inode *dir, struct dentry *dentry, umode_t mask)
2669{
2670 return may_create(dir, dentry, SECCLASS_DIR);
2671}
2672
2673static int selinux_inode_rmdir(struct inode *dir, struct dentry *dentry)
2674{
2675 return may_link(dir, dentry, MAY_RMDIR);
2676}
2677
2678static int selinux_inode_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
2679{
2680 return may_create(dir, dentry, inode_mode_to_security_class(mode));
2681}
2682
2683static int selinux_inode_rename(struct inode *old_inode, struct dentry *old_dentry,
2684 struct inode *new_inode, struct dentry *new_dentry)
2685{
2686 return may_rename(old_inode, old_dentry, new_inode, new_dentry);
2687}
2688
2689static int selinux_inode_readlink(struct dentry *dentry)
2690{
2691 const struct cred *cred = current_cred();
2692
2693 return dentry_has_perm(cred, dentry, FILE__READ);
2694}
2695
2696static int selinux_inode_follow_link(struct dentry *dentry, struct nameidata *nameidata)
2697{
2698 const struct cred *cred = current_cred();
2699
2700 return dentry_has_perm(cred, dentry, FILE__READ);
2701}
2702
2703static noinline int audit_inode_permission(struct inode *inode,
2704 u32 perms, u32 audited, u32 denied,
2705 unsigned flags)
2706{
2707 struct common_audit_data ad;
2708 struct inode_security_struct *isec = inode->i_security;
2709 int rc;
2710
2711 ad.type = LSM_AUDIT_DATA_INODE;
2712 ad.u.inode = inode;
2713
2714 rc = slow_avc_audit(current_sid(), isec->sid, isec->sclass, perms,
2715 audited, denied, &ad, flags);
2716 if (rc)
2717 return rc;
2718 return 0;
2719}
2720
2721static int selinux_inode_permission(struct inode *inode, int mask)
2722{
2723 const struct cred *cred = current_cred();
2724 u32 perms;
2725 bool from_access;
2726 unsigned flags = mask & MAY_NOT_BLOCK;
2727 struct inode_security_struct *isec;
2728 u32 sid;
2729 struct av_decision avd;
2730 int rc, rc2;
2731 u32 audited, denied;
2732
2733 from_access = mask & MAY_ACCESS;
2734 mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND);
2735
2736
2737 if (!mask)
2738 return 0;
2739
2740 validate_creds(cred);
2741
2742 if (unlikely(IS_PRIVATE(inode)))
2743 return 0;
2744
2745 perms = file_mask_to_av(inode->i_mode, mask);
2746
2747 sid = cred_sid(cred);
2748 isec = inode->i_security;
2749
2750 rc = avc_has_perm_noaudit(sid, isec->sid, isec->sclass, perms, 0, &avd);
2751 audited = avc_audit_required(perms, &avd, rc,
2752 from_access ? FILE__AUDIT_ACCESS : 0,
2753 &denied);
2754 if (likely(!audited))
2755 return rc;
2756
2757 rc2 = audit_inode_permission(inode, perms, audited, denied, flags);
2758 if (rc2)
2759 return rc2;
2760 return rc;
2761}
2762
2763static int selinux_inode_setattr(struct dentry *dentry, struct iattr *iattr)
2764{
2765 const struct cred *cred = current_cred();
2766 unsigned int ia_valid = iattr->ia_valid;
2767 __u32 av = FILE__WRITE;
2768
2769
2770 if (ia_valid & ATTR_FORCE) {
2771 ia_valid &= ~(ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_MODE |
2772 ATTR_FORCE);
2773 if (!ia_valid)
2774 return 0;
2775 }
2776
2777 if (ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID |
2778 ATTR_ATIME_SET | ATTR_MTIME_SET | ATTR_TIMES_SET))
2779 return dentry_has_perm(cred, dentry, FILE__SETATTR);
2780
2781 if (selinux_policycap_openperm && (ia_valid & ATTR_SIZE))
2782 av |= FILE__OPEN;
2783
2784 return dentry_has_perm(cred, dentry, av);
2785}
2786
2787static int selinux_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
2788{
2789 const struct cred *cred = current_cred();
2790 struct path path;
2791
2792 path.dentry = dentry;
2793 path.mnt = mnt;
2794
2795 return path_has_perm(cred, &path, FILE__GETATTR);
2796}
2797
2798static int selinux_inode_setotherxattr(struct dentry *dentry, const char *name)
2799{
2800 const struct cred *cred = current_cred();
2801
2802 if (!strncmp(name, XATTR_SECURITY_PREFIX,
2803 sizeof XATTR_SECURITY_PREFIX - 1)) {
2804 if (!strcmp(name, XATTR_NAME_CAPS)) {
2805 if (!capable(CAP_SETFCAP))
2806 return -EPERM;
2807 } else if (!capable(CAP_SYS_ADMIN)) {
2808
2809
2810 return -EPERM;
2811 }
2812 }
2813
2814
2815
2816 return dentry_has_perm(cred, dentry, FILE__SETATTR);
2817}
2818
2819static int selinux_inode_setxattr(struct dentry *dentry, const char *name,
2820 const void *value, size_t size, int flags)
2821{
2822 struct inode *inode = dentry->d_inode;
2823 struct inode_security_struct *isec = inode->i_security;
2824 struct superblock_security_struct *sbsec;
2825 struct common_audit_data ad;
2826 u32 newsid, sid = current_sid();
2827 int rc = 0;
2828
2829 if (strcmp(name, XATTR_NAME_SELINUX))
2830 return selinux_inode_setotherxattr(dentry, name);
2831
2832 sbsec = inode->i_sb->s_security;
2833 if (!(sbsec->flags & SE_SBLABELSUPP))
2834 return -EOPNOTSUPP;
2835
2836 if (!inode_owner_or_capable(inode))
2837 return -EPERM;
2838
2839 ad.type = LSM_AUDIT_DATA_DENTRY;
2840 ad.u.dentry = dentry;
2841
2842 rc = avc_has_perm(sid, isec->sid, isec->sclass,
2843 FILE__RELABELFROM, &ad);
2844 if (rc)
2845 return rc;
2846
2847 rc = security_context_to_sid(value, size, &newsid);
2848 if (rc == -EINVAL) {
2849 if (!capable(CAP_MAC_ADMIN)) {
2850 struct audit_buffer *ab;
2851 size_t audit_size;
2852 const char *str;
2853
2854
2855
2856 if (value) {
2857 str = value;
2858 if (str[size - 1] == '\0')
2859 audit_size = size - 1;
2860 else
2861 audit_size = size;
2862 } else {
2863 str = "";
2864 audit_size = 0;
2865 }
2866 ab = audit_log_start(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR);
2867 audit_log_format(ab, "op=setxattr invalid_context=");
2868 audit_log_n_untrustedstring(ab, value, audit_size);
2869 audit_log_end(ab);
2870
2871 return rc;
2872 }
2873 rc = security_context_to_sid_force(value, size, &newsid);
2874 }
2875 if (rc)
2876 return rc;
2877
2878 rc = avc_has_perm(sid, newsid, isec->sclass,
2879 FILE__RELABELTO, &ad);
2880 if (rc)
2881 return rc;
2882
2883 rc = security_validate_transition(isec->sid, newsid, sid,
2884 isec->sclass);
2885 if (rc)
2886 return rc;
2887
2888 return avc_has_perm(newsid,
2889 sbsec->sid,
2890 SECCLASS_FILESYSTEM,
2891 FILESYSTEM__ASSOCIATE,
2892 &ad);
2893}
2894
2895static void selinux_inode_post_setxattr(struct dentry *dentry, const char *name,
2896 const void *value, size_t size,
2897 int flags)
2898{
2899 struct inode *inode = dentry->d_inode;
2900 struct inode_security_struct *isec = inode->i_security;
2901 u32 newsid;
2902 int rc;
2903
2904 if (strcmp(name, XATTR_NAME_SELINUX)) {
2905
2906 return;
2907 }
2908
2909 rc = security_context_to_sid_force(value, size, &newsid);
2910 if (rc) {
2911 printk(KERN_ERR "SELinux: unable to map context to SID"
2912 "for (%s, %lu), rc=%d\n",
2913 inode->i_sb->s_id, inode->i_ino, -rc);
2914 return;
2915 }
2916
2917 isec->sclass = inode_mode_to_security_class(inode->i_mode);
2918 isec->sid = newsid;
2919 isec->initialized = 1;
2920
2921 return;
2922}
2923
2924static int selinux_inode_getxattr(struct dentry *dentry, const char *name)
2925{
2926 const struct cred *cred = current_cred();
2927
2928 return dentry_has_perm(cred, dentry, FILE__GETATTR);
2929}
2930
2931static int selinux_inode_listxattr(struct dentry *dentry)
2932{
2933 const struct cred *cred = current_cred();
2934
2935 return dentry_has_perm(cred, dentry, FILE__GETATTR);
2936}
2937
2938static int selinux_inode_removexattr(struct dentry *dentry, const char *name)
2939{
2940 if (strcmp(name, XATTR_NAME_SELINUX))
2941 return selinux_inode_setotherxattr(dentry, name);
2942
2943
2944
2945 return -EACCES;
2946}
2947
2948
2949
2950
2951
2952
2953static int selinux_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc)
2954{
2955 u32 size;
2956 int error;
2957 char *context = NULL;
2958 struct inode_security_struct *isec = inode->i_security;
2959
2960 if (strcmp(name, XATTR_SELINUX_SUFFIX))
2961 return -EOPNOTSUPP;
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972 error = selinux_capable(current_cred(), &init_user_ns, CAP_MAC_ADMIN,
2973 SECURITY_CAP_NOAUDIT);
2974 if (!error)
2975 error = security_sid_to_context_force(isec->sid, &context,
2976 &size);
2977 else
2978 error = security_sid_to_context(isec->sid, &context, &size);
2979 if (error)
2980 return error;
2981 error = size;
2982 if (alloc) {
2983 *buffer = context;
2984 goto out_nofree;
2985 }
2986 kfree(context);
2987out_nofree:
2988 return error;
2989}
2990
2991static int selinux_inode_setsecurity(struct inode *inode, const char *name,
2992 const void *value, size_t size, int flags)
2993{
2994 struct inode_security_struct *isec = inode->i_security;
2995 u32 newsid;
2996 int rc;
2997
2998 if (strcmp(name, XATTR_SELINUX_SUFFIX))
2999 return -EOPNOTSUPP;
3000
3001 if (!value || !size)
3002 return -EACCES;
3003
3004 rc = security_context_to_sid((void *)value, size, &newsid);
3005 if (rc)
3006 return rc;
3007
3008 isec->sclass = inode_mode_to_security_class(inode->i_mode);
3009 isec->sid = newsid;
3010 isec->initialized = 1;
3011 return 0;
3012}
3013
3014static int selinux_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
3015{
3016 const int len = sizeof(XATTR_NAME_SELINUX);
3017 if (buffer && len <= buffer_size)
3018 memcpy(buffer, XATTR_NAME_SELINUX, len);
3019 return len;
3020}
3021
3022static void selinux_inode_getsecid(const struct inode *inode, u32 *secid)
3023{
3024 struct inode_security_struct *isec = inode->i_security;
3025 *secid = isec->sid;
3026}
3027
3028
3029
3030static int selinux_revalidate_file_permission(struct file *file, int mask)
3031{
3032 const struct cred *cred = current_cred();
3033 struct inode *inode = file_inode(file);
3034
3035
3036 if ((file->f_flags & O_APPEND) && (mask & MAY_WRITE))
3037 mask |= MAY_APPEND;
3038
3039 return file_has_perm(cred, file,
3040 file_mask_to_av(inode->i_mode, mask));
3041}
3042
3043static int selinux_file_permission(struct file *file, int mask)
3044{
3045 struct inode *inode = file_inode(file);
3046 struct file_security_struct *fsec = file->f_security;
3047 struct inode_security_struct *isec = inode->i_security;
3048 u32 sid = current_sid();
3049
3050 if (!mask)
3051
3052 return 0;
3053
3054 if (sid == fsec->sid && fsec->isid == isec->sid &&
3055 fsec->pseqno == avc_policy_seqno())
3056
3057 return 0;
3058
3059 return selinux_revalidate_file_permission(file, mask);
3060}
3061
3062static int selinux_file_alloc_security(struct file *file)
3063{
3064 return file_alloc_security(file);
3065}
3066
3067static void selinux_file_free_security(struct file *file)
3068{
3069 file_free_security(file);
3070}
3071
3072static int selinux_file_ioctl(struct file *file, unsigned int cmd,
3073 unsigned long arg)
3074{
3075 const struct cred *cred = current_cred();
3076 int error = 0;
3077
3078 switch (cmd) {
3079 case FIONREAD:
3080
3081 case FIBMAP:
3082
3083 case FIGETBSZ:
3084
3085 case FS_IOC_GETFLAGS:
3086
3087 case FS_IOC_GETVERSION:
3088 error = file_has_perm(cred, file, FILE__GETATTR);
3089 break;
3090
3091 case FS_IOC_SETFLAGS:
3092
3093 case FS_IOC_SETVERSION:
3094 error = file_has_perm(cred, file, FILE__SETATTR);
3095 break;
3096
3097
3098 case FIONBIO:
3099
3100 case FIOASYNC:
3101 error = file_has_perm(cred, file, 0);
3102 break;
3103
3104 case KDSKBENT:
3105 case KDSKBSENT:
3106 error = cred_has_capability(cred, CAP_SYS_TTY_CONFIG,
3107 SECURITY_CAP_AUDIT);
3108 break;
3109
3110
3111
3112
3113 default:
3114 error = file_has_perm(cred, file, FILE__IOCTL);
3115 }
3116 return error;
3117}
3118
3119static int default_noexec;
3120
3121static int file_map_prot_check(struct file *file, unsigned long prot, int shared)
3122{
3123 const struct cred *cred = current_cred();
3124 int rc = 0;
3125
3126 if (default_noexec &&
3127 (prot & PROT_EXEC) && (!file || (!shared && (prot & PROT_WRITE)))) {
3128
3129
3130
3131
3132
3133 rc = cred_has_perm(cred, cred, PROCESS__EXECMEM);
3134 if (rc)
3135 goto error;
3136 }
3137
3138 if (file) {
3139
3140 u32 av = FILE__READ;
3141
3142
3143 if (shared && (prot & PROT_WRITE))
3144 av |= FILE__WRITE;
3145
3146 if (prot & PROT_EXEC)
3147 av |= FILE__EXECUTE;
3148
3149 return file_has_perm(cred, file, av);
3150 }
3151
3152error:
3153 return rc;
3154}
3155
3156static int selinux_mmap_addr(unsigned long addr)
3157{
3158 int rc = 0;
3159 u32 sid = current_sid();
3160
3161
3162
3163
3164
3165
3166
3167 if (addr < CONFIG_LSM_MMAP_MIN_ADDR) {
3168 rc = avc_has_perm(sid, sid, SECCLASS_MEMPROTECT,
3169 MEMPROTECT__MMAP_ZERO, NULL);
3170 if (rc)
3171 return rc;
3172 }
3173
3174
3175 return cap_mmap_addr(addr);
3176}
3177
3178static int selinux_mmap_file(struct file *file, unsigned long reqprot,
3179 unsigned long prot, unsigned long flags)
3180{
3181 if (selinux_checkreqprot)
3182 prot = reqprot;
3183
3184 return file_map_prot_check(file, prot,
3185 (flags & MAP_TYPE) == MAP_SHARED);
3186}
3187
3188static int selinux_file_mprotect(struct vm_area_struct *vma,
3189 unsigned long reqprot,
3190 unsigned long prot)
3191{
3192 const struct cred *cred = current_cred();
3193
3194 if (selinux_checkreqprot)
3195 prot = reqprot;
3196
3197 if (default_noexec &&
3198 (prot & PROT_EXEC) && !(vma->vm_flags & VM_EXEC)) {
3199 int rc = 0;
3200 if (vma->vm_start >= vma->vm_mm->start_brk &&
3201 vma->vm_end <= vma->vm_mm->brk) {
3202 rc = cred_has_perm(cred, cred, PROCESS__EXECHEAP);
3203 } else if (!vma->vm_file &&
3204 vma->vm_start <= vma->vm_mm->start_stack &&
3205 vma->vm_end >= vma->vm_mm->start_stack) {
3206 rc = current_has_perm(current, PROCESS__EXECSTACK);
3207 } else if (vma->vm_file && vma->anon_vma) {
3208
3209
3210
3211
3212
3213
3214
3215 rc = file_has_perm(cred, vma->vm_file, FILE__EXECMOD);
3216 }
3217 if (rc)
3218 return rc;
3219 }
3220
3221 return file_map_prot_check(vma->vm_file, prot, vma->vm_flags&VM_SHARED);
3222}
3223
3224static int selinux_file_lock(struct file *file, unsigned int cmd)
3225{
3226 const struct cred *cred = current_cred();
3227
3228 return file_has_perm(cred, file, FILE__LOCK);
3229}
3230
3231static int selinux_file_fcntl(struct file *file, unsigned int cmd,
3232 unsigned long arg)
3233{
3234 const struct cred *cred = current_cred();
3235 int err = 0;
3236
3237 switch (cmd) {
3238 case F_SETFL:
3239 if ((file->f_flags & O_APPEND) && !(arg & O_APPEND)) {
3240 err = file_has_perm(cred, file, FILE__WRITE);
3241 break;
3242 }
3243
3244 case F_SETOWN:
3245 case F_SETSIG:
3246 case F_GETFL:
3247 case F_GETOWN:
3248 case F_GETSIG:
3249 case F_GETOWNER_UIDS:
3250
3251 err = file_has_perm(cred, file, 0);
3252 break;
3253 case F_GETLK:
3254 case F_SETLK:
3255 case F_SETLKW:
3256#if BITS_PER_LONG == 32
3257 case F_GETLK64:
3258 case F_SETLK64:
3259 case F_SETLKW64:
3260#endif
3261 err = file_has_perm(cred, file, FILE__LOCK);
3262 break;
3263 }
3264
3265 return err;
3266}
3267
3268static int selinux_file_set_fowner(struct file *file)
3269{
3270 struct file_security_struct *fsec;
3271
3272 fsec = file->f_security;
3273 fsec->fown_sid = current_sid();
3274
3275 return 0;
3276}
3277
3278static int selinux_file_send_sigiotask(struct task_struct *tsk,
3279 struct fown_struct *fown, int signum)
3280{
3281 struct file *file;
3282 u32 sid = task_sid(tsk);
3283 u32 perm;
3284 struct file_security_struct *fsec;
3285
3286
3287 file = container_of(fown, struct file, f_owner);
3288
3289 fsec = file->f_security;
3290
3291 if (!signum)
3292 perm = signal_to_av(SIGIO);
3293 else
3294 perm = signal_to_av(signum);
3295
3296 return avc_has_perm(fsec->fown_sid, sid,
3297 SECCLASS_PROCESS, perm, NULL);
3298}
3299
3300static int selinux_file_receive(struct file *file)
3301{
3302 const struct cred *cred = current_cred();
3303
3304 return file_has_perm(cred, file, file_to_av(file));
3305}
3306
3307static int selinux_file_open(struct file *file, const struct cred *cred)
3308{
3309 struct file_security_struct *fsec;
3310 struct inode_security_struct *isec;
3311
3312 fsec = file->f_security;
3313 isec = file_inode(file)->i_security;
3314
3315
3316
3317
3318
3319
3320
3321 fsec->isid = isec->sid;
3322 fsec->pseqno = avc_policy_seqno();
3323
3324
3325
3326
3327
3328
3329
3330
3331 return file_path_has_perm(cred, file, open_file_to_av(file));
3332}
3333
3334
3335
3336static int selinux_task_create(unsigned long clone_flags)
3337{
3338 return current_has_perm(current, PROCESS__FORK);
3339}
3340
3341
3342
3343
3344static int selinux_cred_alloc_blank(struct cred *cred, gfp_t gfp)
3345{
3346 struct task_security_struct *tsec;
3347
3348 tsec = kzalloc(sizeof(struct task_security_struct), gfp);
3349 if (!tsec)
3350 return -ENOMEM;
3351
3352 cred->security = tsec;
3353 return 0;
3354}
3355
3356
3357
3358
3359static void selinux_cred_free(struct cred *cred)
3360{
3361 struct task_security_struct *tsec = cred->security;
3362
3363
3364
3365
3366
3367 BUG_ON(cred->security && (unsigned long) cred->security < PAGE_SIZE);
3368 cred->security = (void *) 0x7UL;
3369 kfree(tsec);
3370}
3371
3372
3373
3374
3375static int selinux_cred_prepare(struct cred *new, const struct cred *old,
3376 gfp_t gfp)
3377{
3378 const struct task_security_struct *old_tsec;
3379 struct task_security_struct *tsec;
3380
3381 old_tsec = old->security;
3382
3383 tsec = kmemdup(old_tsec, sizeof(struct task_security_struct), gfp);
3384 if (!tsec)
3385 return -ENOMEM;
3386
3387 new->security = tsec;
3388 return 0;
3389}
3390
3391
3392
3393
3394static void selinux_cred_transfer(struct cred *new, const struct cred *old)
3395{
3396 const struct task_security_struct *old_tsec = old->security;
3397 struct task_security_struct *tsec = new->security;
3398
3399 *tsec = *old_tsec;
3400}
3401
3402
3403
3404
3405
3406static int selinux_kernel_act_as(struct cred *new, u32 secid)
3407{
3408 struct task_security_struct *tsec = new->security;
3409 u32 sid = current_sid();
3410 int ret;
3411
3412 ret = avc_has_perm(sid, secid,
3413 SECCLASS_KERNEL_SERVICE,
3414 KERNEL_SERVICE__USE_AS_OVERRIDE,
3415 NULL);
3416 if (ret == 0) {
3417 tsec->sid = secid;
3418 tsec->create_sid = 0;
3419 tsec->keycreate_sid = 0;
3420 tsec->sockcreate_sid = 0;
3421 }
3422 return ret;
3423}
3424
3425
3426
3427
3428
3429static int selinux_kernel_create_files_as(struct cred *new, struct inode *inode)
3430{
3431 struct inode_security_struct *isec = inode->i_security;
3432 struct task_security_struct *tsec = new->security;
3433 u32 sid = current_sid();
3434 int ret;
3435
3436 ret = avc_has_perm(sid, isec->sid,
3437 SECCLASS_KERNEL_SERVICE,
3438 KERNEL_SERVICE__CREATE_FILES_AS,
3439 NULL);
3440
3441 if (ret == 0)
3442 tsec->create_sid = isec->sid;
3443 return ret;
3444}
3445
3446static int selinux_kernel_module_request(char *kmod_name)
3447{
3448 u32 sid;
3449 struct common_audit_data ad;
3450
3451 sid = task_sid(current);
3452
3453 ad.type = LSM_AUDIT_DATA_KMOD;
3454 ad.u.kmod_name = kmod_name;
3455
3456 return avc_has_perm(sid, SECINITSID_KERNEL, SECCLASS_SYSTEM,
3457 SYSTEM__MODULE_REQUEST, &ad);
3458}
3459
3460static int selinux_task_setpgid(struct task_struct *p, pid_t pgid)
3461{
3462 return current_has_perm(p, PROCESS__SETPGID);
3463}
3464
3465static int selinux_task_getpgid(struct task_struct *p)
3466{
3467 return current_has_perm(p, PROCESS__GETPGID);
3468}
3469
3470static int selinux_task_getsid(struct task_struct *p)
3471{
3472 return current_has_perm(p, PROCESS__GETSESSION);
3473}
3474
3475static void selinux_task_getsecid(struct task_struct *p, u32 *secid)
3476{
3477 *secid = task_sid(p);
3478}
3479
3480static int selinux_task_setnice(struct task_struct *p, int nice)
3481{
3482 int rc;
3483
3484 rc = cap_task_setnice(p, nice);
3485 if (rc)
3486 return rc;
3487
3488 return current_has_perm(p, PROCESS__SETSCHED);
3489}
3490
3491static int selinux_task_setioprio(struct task_struct *p, int ioprio)
3492{
3493 int rc;
3494
3495 rc = cap_task_setioprio(p, ioprio);
3496 if (rc)
3497 return rc;
3498
3499 return current_has_perm(p, PROCESS__SETSCHED);
3500}
3501
3502static int selinux_task_getioprio(struct task_struct *p)
3503{
3504 return current_has_perm(p, PROCESS__GETSCHED);
3505}
3506
3507static int selinux_task_setrlimit(struct task_struct *p, unsigned int resource,
3508 struct rlimit *new_rlim)
3509{
3510 struct rlimit *old_rlim = p->signal->rlim + resource;
3511
3512
3513
3514
3515
3516 if (old_rlim->rlim_max != new_rlim->rlim_max)
3517 return current_has_perm(p, PROCESS__SETRLIMIT);
3518
3519 return 0;
3520}
3521
3522static int selinux_task_setscheduler(struct task_struct *p)
3523{
3524 int rc;
3525
3526 rc = cap_task_setscheduler(p);
3527 if (rc)
3528 return rc;
3529
3530 return current_has_perm(p, PROCESS__SETSCHED);
3531}
3532
3533static int selinux_task_getscheduler(struct task_struct *p)
3534{
3535 return current_has_perm(p, PROCESS__GETSCHED);
3536}
3537
3538static int selinux_task_movememory(struct task_struct *p)
3539{
3540 return current_has_perm(p, PROCESS__SETSCHED);
3541}
3542
3543static int selinux_task_kill(struct task_struct *p, struct siginfo *info,
3544 int sig, u32 secid)
3545{
3546 u32 perm;
3547 int rc;
3548
3549 if (!sig)
3550 perm = PROCESS__SIGNULL;
3551 else
3552 perm = signal_to_av(sig);
3553 if (secid)
3554 rc = avc_has_perm(secid, task_sid(p),
3555 SECCLASS_PROCESS, perm, NULL);
3556 else
3557 rc = current_has_perm(p, perm);
3558 return rc;
3559}
3560
3561static int selinux_task_wait(struct task_struct *p)
3562{
3563 return task_has_perm(p, current, PROCESS__SIGCHLD);
3564}
3565
3566static void selinux_task_to_inode(struct task_struct *p,
3567 struct inode *inode)
3568{
3569 struct inode_security_struct *isec = inode->i_security;
3570 u32 sid = task_sid(p);
3571
3572 isec->sid = sid;
3573 isec->initialized = 1;
3574}
3575
3576
3577static int selinux_parse_skb_ipv4(struct sk_buff *skb,
3578 struct common_audit_data *ad, u8 *proto)
3579{
3580 int offset, ihlen, ret = -EINVAL;
3581 struct iphdr _iph, *ih;
3582
3583 offset = skb_network_offset(skb);
3584 ih = skb_header_pointer(skb, offset, sizeof(_iph), &_iph);
3585 if (ih == NULL)
3586 goto out;
3587
3588 ihlen = ih->ihl * 4;
3589 if (ihlen < sizeof(_iph))
3590 goto out;
3591
3592 ad->u.net->v4info.saddr = ih->saddr;
3593 ad->u.net->v4info.daddr = ih->daddr;
3594 ret = 0;
3595
3596 if (proto)
3597 *proto = ih->protocol;
3598
3599 switch (ih->protocol) {
3600 case IPPROTO_TCP: {
3601 struct tcphdr _tcph, *th;
3602
3603 if (ntohs(ih->frag_off) & IP_OFFSET)
3604 break;
3605
3606 offset += ihlen;
3607 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
3608 if (th == NULL)
3609 break;
3610
3611 ad->u.net->sport = th->source;
3612 ad->u.net->dport = th->dest;
3613 break;
3614 }
3615
3616 case IPPROTO_UDP: {
3617 struct udphdr _udph, *uh;
3618
3619 if (ntohs(ih->frag_off) & IP_OFFSET)
3620 break;
3621
3622 offset += ihlen;
3623 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
3624 if (uh == NULL)
3625 break;
3626
3627 ad->u.net->sport = uh->source;
3628 ad->u.net->dport = uh->dest;
3629 break;
3630 }
3631
3632 case IPPROTO_DCCP: {
3633 struct dccp_hdr _dccph, *dh;
3634
3635 if (ntohs(ih->frag_off) & IP_OFFSET)
3636 break;
3637
3638 offset += ihlen;
3639 dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
3640 if (dh == NULL)
3641 break;
3642
3643 ad->u.net->sport = dh->dccph_sport;
3644 ad->u.net->dport = dh->dccph_dport;
3645 break;
3646 }
3647
3648 default:
3649 break;
3650 }
3651out:
3652 return ret;
3653}
3654
3655#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3656
3657
3658static int selinux_parse_skb_ipv6(struct sk_buff *skb,
3659 struct common_audit_data *ad, u8 *proto)
3660{
3661 u8 nexthdr;
3662 int ret = -EINVAL, offset;
3663 struct ipv6hdr _ipv6h, *ip6;
3664 __be16 frag_off;
3665
3666 offset = skb_network_offset(skb);
3667 ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h);
3668 if (ip6 == NULL)
3669 goto out;
3670
3671 ad->u.net->v6info.saddr = ip6->saddr;
3672 ad->u.net->v6info.daddr = ip6->daddr;
3673 ret = 0;
3674
3675 nexthdr = ip6->nexthdr;
3676 offset += sizeof(_ipv6h);
3677 offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
3678 if (offset < 0)
3679 goto out;
3680
3681 if (proto)
3682 *proto = nexthdr;
3683
3684 switch (nexthdr) {
3685 case IPPROTO_TCP: {
3686 struct tcphdr _tcph, *th;
3687
3688 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
3689 if (th == NULL)
3690 break;
3691
3692 ad->u.net->sport = th->source;
3693 ad->u.net->dport = th->dest;
3694 break;
3695 }
3696
3697 case IPPROTO_UDP: {
3698 struct udphdr _udph, *uh;
3699
3700 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
3701 if (uh == NULL)
3702 break;
3703
3704 ad->u.net->sport = uh->source;
3705 ad->u.net->dport = uh->dest;
3706 break;
3707 }
3708
3709 case IPPROTO_DCCP: {
3710 struct dccp_hdr _dccph, *dh;
3711
3712 dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
3713 if (dh == NULL)
3714 break;
3715
3716 ad->u.net->sport = dh->dccph_sport;
3717 ad->u.net->dport = dh->dccph_dport;
3718 break;
3719 }
3720
3721
3722 default:
3723 break;
3724 }
3725out:
3726 return ret;
3727}
3728
3729#endif
3730
3731static int selinux_parse_skb(struct sk_buff *skb, struct common_audit_data *ad,
3732 char **_addrp, int src, u8 *proto)
3733{
3734 char *addrp;
3735 int ret;
3736
3737 switch (ad->u.net->family) {
3738 case PF_INET:
3739 ret = selinux_parse_skb_ipv4(skb, ad, proto);
3740 if (ret)
3741 goto parse_error;
3742 addrp = (char *)(src ? &ad->u.net->v4info.saddr :
3743 &ad->u.net->v4info.daddr);
3744 goto okay;
3745
3746#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3747 case PF_INET6:
3748 ret = selinux_parse_skb_ipv6(skb, ad, proto);
3749 if (ret)
3750 goto parse_error;
3751 addrp = (char *)(src ? &ad->u.net->v6info.saddr :
3752 &ad->u.net->v6info.daddr);
3753 goto okay;
3754#endif
3755 default:
3756 addrp = NULL;
3757 goto okay;
3758 }
3759
3760parse_error:
3761 printk(KERN_WARNING
3762 "SELinux: failure in selinux_parse_skb(),"
3763 " unable to parse packet\n");
3764 return ret;
3765
3766okay:
3767 if (_addrp)
3768 *_addrp = addrp;
3769 return 0;
3770}
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787static int selinux_skb_peerlbl_sid(struct sk_buff *skb, u16 family, u32 *sid)
3788{
3789 int err;
3790 u32 xfrm_sid;
3791 u32 nlbl_sid;
3792 u32 nlbl_type;
3793
3794 selinux_skb_xfrm_sid(skb, &xfrm_sid);
3795 selinux_netlbl_skbuff_getsid(skb, family, &nlbl_type, &nlbl_sid);
3796
3797 err = security_net_peersid_resolve(nlbl_sid, nlbl_type, xfrm_sid, sid);
3798 if (unlikely(err)) {
3799 printk(KERN_WARNING
3800 "SELinux: failure in selinux_skb_peerlbl_sid(),"
3801 " unable to determine packet's peer label\n");
3802 return -EACCES;
3803 }
3804
3805 return 0;
3806}
3807
3808
3809
3810static int socket_sockcreate_sid(const struct task_security_struct *tsec,
3811 u16 secclass, u32 *socksid)
3812{
3813 if (tsec->sockcreate_sid > SECSID_NULL) {
3814 *socksid = tsec->sockcreate_sid;
3815 return 0;
3816 }
3817
3818 return security_transition_sid(tsec->sid, tsec->sid, secclass, NULL,
3819 socksid);
3820}
3821
3822static int sock_has_perm(struct task_struct *task, struct sock *sk, u32 perms)
3823{
3824 struct sk_security_struct *sksec = sk->sk_security;
3825 struct common_audit_data ad;
3826 struct lsm_network_audit net = {0,};
3827 u32 tsid = task_sid(task);
3828
3829 if (sksec->sid == SECINITSID_KERNEL)
3830 return 0;
3831
3832 ad.type = LSM_AUDIT_DATA_NET;
3833 ad.u.net = &net;
3834 ad.u.net->sk = sk;
3835
3836 return avc_has_perm(tsid, sksec->sid, sksec->sclass, perms, &ad);
3837}
3838
3839static int selinux_socket_create(int family, int type,
3840 int protocol, int kern)
3841{
3842 const struct task_security_struct *tsec = current_security();
3843 u32 newsid;
3844 u16 secclass;
3845 int rc;
3846
3847 if (kern)
3848 return 0;
3849
3850 secclass = socket_type_to_security_class(family, type, protocol);
3851 rc = socket_sockcreate_sid(tsec, secclass, &newsid);
3852 if (rc)
3853 return rc;
3854
3855 return avc_has_perm(tsec->sid, newsid, secclass, SOCKET__CREATE, NULL);
3856}
3857
3858static int selinux_socket_post_create(struct socket *sock, int family,
3859 int type, int protocol, int kern)
3860{
3861 const struct task_security_struct *tsec = current_security();
3862 struct inode_security_struct *isec = SOCK_INODE(sock)->i_security;
3863 struct sk_security_struct *sksec;
3864 int err = 0;
3865
3866 isec->sclass = socket_type_to_security_class(family, type, protocol);
3867
3868 if (kern)
3869 isec->sid = SECINITSID_KERNEL;
3870 else {
3871 err = socket_sockcreate_sid(tsec, isec->sclass, &(isec->sid));
3872 if (err)
3873 return err;
3874 }
3875
3876 isec->initialized = 1;
3877
3878 if (sock->sk) {
3879 sksec = sock->sk->sk_security;
3880 sksec->sid = isec->sid;
3881 sksec->sclass = isec->sclass;
3882 err = selinux_netlbl_socket_post_create(sock->sk, family);
3883 }
3884
3885 return err;
3886}
3887
3888
3889
3890
3891
3892static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, int addrlen)
3893{
3894 struct sock *sk = sock->sk;
3895 u16 family;
3896 int err;
3897
3898 err = sock_has_perm(current, sk, SOCKET__BIND);
3899 if (err)
3900 goto out;
3901
3902
3903
3904
3905
3906
3907 family = sk->sk_family;
3908 if (family == PF_INET || family == PF_INET6) {
3909 char *addrp;
3910 struct sk_security_struct *sksec = sk->sk_security;
3911 struct common_audit_data ad;
3912 struct lsm_network_audit net = {0,};
3913 struct sockaddr_in *addr4 = NULL;
3914 struct sockaddr_in6 *addr6 = NULL;
3915 unsigned short snum;
3916 u32 sid, node_perm;
3917
3918 if (family == PF_INET) {
3919 addr4 = (struct sockaddr_in *)address;
3920 snum = ntohs(addr4->sin_port);
3921 addrp = (char *)&addr4->sin_addr.s_addr;
3922 } else {
3923 addr6 = (struct sockaddr_in6 *)address;
3924 snum = ntohs(addr6->sin6_port);
3925 addrp = (char *)&addr6->sin6_addr.s6_addr;
3926 }
3927
3928 if (snum) {
3929 int low, high;
3930
3931 inet_get_local_port_range(&low, &high);
3932
3933 if (snum < max(PROT_SOCK, low) || snum > high) {
3934 err = sel_netport_sid(sk->sk_protocol,
3935 snum, &sid);
3936 if (err)
3937 goto out;
3938 ad.type = LSM_AUDIT_DATA_NET;
3939 ad.u.net = &net;
3940 ad.u.net->sport = htons(snum);
3941 ad.u.net->family = family;
3942 err = avc_has_perm(sksec->sid, sid,
3943 sksec->sclass,
3944 SOCKET__NAME_BIND, &ad);
3945 if (err)
3946 goto out;
3947 }
3948 }
3949
3950 switch (sksec->sclass) {
3951 case SECCLASS_TCP_SOCKET:
3952 node_perm = TCP_SOCKET__NODE_BIND;
3953 break;
3954
3955 case SECCLASS_UDP_SOCKET:
3956 node_perm = UDP_SOCKET__NODE_BIND;
3957 break;
3958
3959 case SECCLASS_DCCP_SOCKET:
3960 node_perm = DCCP_SOCKET__NODE_BIND;
3961 break;
3962
3963 default:
3964 node_perm = RAWIP_SOCKET__NODE_BIND;
3965 break;
3966 }
3967
3968 err = sel_netnode_sid(addrp, family, &sid);
3969 if (err)
3970 goto out;
3971
3972 ad.type = LSM_AUDIT_DATA_NET;
3973 ad.u.net = &net;
3974 ad.u.net->sport = htons(snum);
3975 ad.u.net->family = family;
3976
3977 if (family == PF_INET)
3978 ad.u.net->v4info.saddr = addr4->sin_addr.s_addr;
3979 else
3980 ad.u.net->v6info.saddr = addr6->sin6_addr;
3981
3982 err = avc_has_perm(sksec->sid, sid,
3983 sksec->sclass, node_perm, &ad);
3984 if (err)
3985 goto out;
3986 }
3987out:
3988 return err;
3989}
3990
3991static int selinux_socket_connect(struct socket *sock, struct sockaddr *address, int addrlen)
3992{
3993 struct sock *sk = sock->sk;
3994 struct sk_security_struct *sksec = sk->sk_security;
3995 int err;
3996
3997 err = sock_has_perm(current, sk, SOCKET__CONNECT);
3998 if (err)
3999 return err;
4000
4001
4002
4003
4004 if (sksec->sclass == SECCLASS_TCP_SOCKET ||
4005 sksec->sclass == SECCLASS_DCCP_SOCKET) {
4006 struct common_audit_data ad;
4007 struct lsm_network_audit net = {0,};
4008 struct sockaddr_in *addr4 = NULL;
4009 struct sockaddr_in6 *addr6 = NULL;
4010 unsigned short snum;
4011 u32 sid, perm;
4012
4013 if (sk->sk_family == PF_INET) {
4014 addr4 = (struct sockaddr_in *)address;
4015 if (addrlen < sizeof(struct sockaddr_in))
4016 return -EINVAL;
4017 snum = ntohs(addr4->sin_port);
4018 } else {
4019 addr6 = (struct sockaddr_in6 *)address;
4020 if (addrlen < SIN6_LEN_RFC2133)
4021 return -EINVAL;
4022 snum = ntohs(addr6->sin6_port);
4023 }
4024
4025 err = sel_netport_sid(sk->sk_protocol, snum, &sid);
4026 if (err)
4027 goto out;
4028
4029 perm = (sksec->sclass == SECCLASS_TCP_SOCKET) ?
4030 TCP_SOCKET__NAME_CONNECT : DCCP_SOCKET__NAME_CONNECT;
4031
4032 ad.type = LSM_AUDIT_DATA_NET;
4033 ad.u.net = &net;
4034 ad.u.net->dport = htons(snum);
4035 ad.u.net->family = sk->sk_family;
4036 err = avc_has_perm(sksec->sid, sid, sksec->sclass, perm, &ad);
4037 if (err)
4038 goto out;
4039 }
4040
4041 err = selinux_netlbl_socket_connect(sk, address);
4042
4043out:
4044 return err;
4045}
4046
4047static int selinux_socket_listen(struct socket *sock, int backlog)
4048{
4049 return sock_has_perm(current, sock->sk, SOCKET__LISTEN);
4050}
4051
4052static int selinux_socket_accept(struct socket *sock, struct socket *newsock)
4053{
4054 int err;
4055 struct inode_security_struct *isec;
4056 struct inode_security_struct *newisec;
4057
4058 err = sock_has_perm(current, sock->sk, SOCKET__ACCEPT);
4059 if (err)
4060 return err;
4061
4062 newisec = SOCK_INODE(newsock)->i_security;
4063
4064 isec = SOCK_INODE(sock)->i_security;
4065 newisec->sclass = isec->sclass;
4066 newisec->sid = isec->sid;
4067 newisec->initialized = 1;
4068
4069 return 0;
4070}
4071
4072static int selinux_socket_sendmsg(struct socket *sock, struct msghdr *msg,
4073 int size)
4074{
4075 return sock_has_perm(current, sock->sk, SOCKET__WRITE);
4076}
4077
4078static int selinux_socket_recvmsg(struct socket *sock, struct msghdr *msg,
4079 int size, int flags)
4080{
4081 return sock_has_perm(current, sock->sk, SOCKET__READ);
4082}
4083
4084static int selinux_socket_getsockname(struct socket *sock)
4085{
4086 return sock_has_perm(current, sock->sk, SOCKET__GETATTR);
4087}
4088
4089static int selinux_socket_getpeername(struct socket *sock)
4090{
4091 return sock_has_perm(current, sock->sk, SOCKET__GETATTR);
4092}
4093
4094static int selinux_socket_setsockopt(struct socket *sock, int level, int optname)
4095{
4096 int err;
4097
4098 err = sock_has_perm(current, sock->sk, SOCKET__SETOPT);
4099 if (err)
4100 return err;
4101
4102 return selinux_netlbl_socket_setsockopt(sock, level, optname);
4103}
4104
4105static int selinux_socket_getsockopt(struct socket *sock, int level,
4106 int optname)
4107{
4108 return sock_has_perm(current, sock->sk, SOCKET__GETOPT);
4109}
4110
4111static int selinux_socket_shutdown(struct socket *sock, int how)
4112{
4113 return sock_has_perm(current, sock->sk, SOCKET__SHUTDOWN);
4114}
4115
4116static int selinux_socket_unix_stream_connect(struct sock *sock,
4117 struct sock *other,
4118 struct sock *newsk)
4119{
4120 struct sk_security_struct *sksec_sock = sock->sk_security;
4121 struct sk_security_struct *sksec_other = other->sk_security;
4122 struct sk_security_struct *sksec_new = newsk->sk_security;
4123 struct common_audit_data ad;
4124 struct lsm_network_audit net = {0,};
4125 int err;
4126
4127 ad.type = LSM_AUDIT_DATA_NET;
4128 ad.u.net = &net;
4129 ad.u.net->sk = other;
4130
4131 err = avc_has_perm(sksec_sock->sid, sksec_other->sid,
4132 sksec_other->sclass,
4133 UNIX_STREAM_SOCKET__CONNECTTO, &ad);
4134 if (err)
4135 return err;
4136
4137
4138 sksec_new->peer_sid = sksec_sock->sid;
4139 err = security_sid_mls_copy(sksec_other->sid, sksec_sock->sid,
4140 &sksec_new->sid);
4141 if (err)
4142 return err;
4143
4144
4145 sksec_sock->peer_sid = sksec_new->sid;
4146
4147 return 0;
4148}
4149
4150static int selinux_socket_unix_may_send(struct socket *sock,
4151 struct socket *other)
4152{
4153 struct sk_security_struct *ssec = sock->sk->sk_security;
4154 struct sk_security_struct *osec = other->sk->sk_security;
4155 struct common_audit_data ad;
4156 struct lsm_network_audit net = {0,};
4157
4158 ad.type = LSM_AUDIT_DATA_NET;
4159 ad.u.net = &net;
4160 ad.u.net->sk = other->sk;
4161
4162 return avc_has_perm(ssec->sid, osec->sid, osec->sclass, SOCKET__SENDTO,
4163 &ad);
4164}
4165
4166static int selinux_inet_sys_rcv_skb(int ifindex, char *addrp, u16 family,
4167 u32 peer_sid,
4168 struct common_audit_data *ad)
4169{
4170 int err;
4171 u32 if_sid;
4172 u32 node_sid;
4173
4174 err = sel_netif_sid(ifindex, &if_sid);
4175 if (err)
4176 return err;
4177 err = avc_has_perm(peer_sid, if_sid,
4178 SECCLASS_NETIF, NETIF__INGRESS, ad);
4179 if (err)
4180 return err;
4181
4182 err = sel_netnode_sid(addrp, family, &node_sid);
4183 if (err)
4184 return err;
4185 return avc_has_perm(peer_sid, node_sid,
4186 SECCLASS_NODE, NODE__RECVFROM, ad);
4187}
4188
4189static int selinux_sock_rcv_skb_compat(struct sock *sk, struct sk_buff *skb,
4190 u16 family)
4191{
4192 int err = 0;
4193 struct sk_security_struct *sksec = sk->sk_security;
4194 u32 sk_sid = sksec->sid;
4195 struct common_audit_data ad;
4196 struct lsm_network_audit net = {0,};
4197 char *addrp;
4198
4199 ad.type = LSM_AUDIT_DATA_NET;
4200 ad.u.net = &net;
4201 ad.u.net->netif = skb->skb_iif;
4202 ad.u.net->family = family;
4203 err = selinux_parse_skb(skb, &ad, &addrp, 1, NULL);
4204 if (err)
4205 return err;
4206
4207 if (selinux_secmark_enabled()) {
4208 err = avc_has_perm(sk_sid, skb->secmark, SECCLASS_PACKET,
4209 PACKET__RECV, &ad);
4210 if (err)
4211 return err;
4212 }
4213
4214 err = selinux_netlbl_sock_rcv_skb(sksec, skb, family, &ad);
4215 if (err)
4216 return err;
4217 err = selinux_xfrm_sock_rcv_skb(sksec->sid, skb, &ad);
4218
4219 return err;
4220}
4221
4222static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
4223{
4224 int err;
4225 struct sk_security_struct *sksec = sk->sk_security;
4226 u16 family = sk->sk_family;
4227 u32 sk_sid = sksec->sid;
4228 struct common_audit_data ad;
4229 struct lsm_network_audit net = {0,};
4230 char *addrp;
4231 u8 secmark_active;
4232 u8 peerlbl_active;
4233
4234 if (family != PF_INET && family != PF_INET6)
4235 return 0;
4236
4237
4238 if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
4239 family = PF_INET;
4240
4241
4242
4243
4244
4245 if (!selinux_policycap_netpeer)
4246 return selinux_sock_rcv_skb_compat(sk, skb, family);
4247
4248 secmark_active = selinux_secmark_enabled();
4249 peerlbl_active = netlbl_enabled() || selinux_xfrm_enabled();
4250 if (!secmark_active && !peerlbl_active)
4251 return 0;
4252
4253 ad.type = LSM_AUDIT_DATA_NET;
4254 ad.u.net = &net;
4255 ad.u.net->netif = skb->skb_iif;
4256 ad.u.net->family = family;
4257 err = selinux_parse_skb(skb, &ad, &addrp, 1, NULL);
4258 if (err)
4259 return err;
4260
4261 if (peerlbl_active) {
4262 u32 peer_sid;
4263
4264 err = selinux_skb_peerlbl_sid(skb, family, &peer_sid);
4265 if (err)
4266 return err;
4267 err = selinux_inet_sys_rcv_skb(skb->skb_iif, addrp, family,
4268 peer_sid, &ad);
4269 if (err) {
4270 selinux_netlbl_err(skb, err, 0);
4271 return err;
4272 }
4273 err = avc_has_perm(sk_sid, peer_sid, SECCLASS_PEER,
4274 PEER__RECV, &ad);
4275 if (err)
4276 selinux_netlbl_err(skb, err, 0);
4277 }
4278
4279 if (secmark_active) {
4280 err = avc_has_perm(sk_sid, skb->secmark, SECCLASS_PACKET,
4281 PACKET__RECV, &ad);
4282 if (err)
4283 return err;
4284 }
4285
4286 return err;
4287}
4288
4289static int selinux_socket_getpeersec_stream(struct socket *sock, char __user *optval,
4290 int __user *optlen, unsigned len)
4291{
4292 int err = 0;
4293 char *scontext;
4294 u32 scontext_len;
4295 struct sk_security_struct *sksec = sock->sk->sk_security;
4296 u32 peer_sid = SECSID_NULL;
4297
4298 if (sksec->sclass == SECCLASS_UNIX_STREAM_SOCKET ||
4299 sksec->sclass == SECCLASS_TCP_SOCKET)
4300 peer_sid = sksec->peer_sid;
4301 if (peer_sid == SECSID_NULL)
4302 return -ENOPROTOOPT;
4303
4304 err = security_sid_to_context(peer_sid, &scontext, &scontext_len);
4305 if (err)
4306 return err;
4307
4308 if (scontext_len > len) {
4309 err = -ERANGE;
4310 goto out_len;
4311 }
4312
4313 if (copy_to_user(optval, scontext, scontext_len))
4314 err = -EFAULT;
4315
4316out_len:
4317 if (put_user(scontext_len, optlen))
4318 err = -EFAULT;
4319 kfree(scontext);
4320 return err;
4321}
4322
4323static int selinux_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
4324{
4325 u32 peer_secid = SECSID_NULL;
4326 u16 family;
4327
4328 if (skb && skb->protocol == htons(ETH_P_IP))
4329 family = PF_INET;
4330 else if (skb && skb->protocol == htons(ETH_P_IPV6))
4331 family = PF_INET6;
4332 else if (sock)
4333 family = sock->sk->sk_family;
4334 else
4335 goto out;
4336
4337 if (sock && family == PF_UNIX)
4338 selinux_inode_getsecid(SOCK_INODE(sock), &peer_secid);
4339 else if (skb)
4340 selinux_skb_peerlbl_sid(skb, family, &peer_secid);
4341
4342out:
4343 *secid = peer_secid;
4344 if (peer_secid == SECSID_NULL)
4345 return -EINVAL;
4346 return 0;
4347}
4348
4349static int selinux_sk_alloc_security(struct sock *sk, int family, gfp_t priority)
4350{
4351 struct sk_security_struct *sksec;
4352
4353 sksec = kzalloc(sizeof(*sksec), priority);
4354 if (!sksec)
4355 return -ENOMEM;
4356
4357 sksec->peer_sid = SECINITSID_UNLABELED;
4358 sksec->sid = SECINITSID_UNLABELED;
4359 selinux_netlbl_sk_security_reset(sksec);
4360 sk->sk_security = sksec;
4361
4362 return 0;
4363}
4364
4365static void selinux_sk_free_security(struct sock *sk)
4366{
4367 struct sk_security_struct *sksec = sk->sk_security;
4368
4369 sk->sk_security = NULL;
4370 selinux_netlbl_sk_security_free(sksec);
4371 kfree(sksec);
4372}
4373
4374static void selinux_sk_clone_security(const struct sock *sk, struct sock *newsk)
4375{
4376 struct sk_security_struct *sksec = sk->sk_security;
4377 struct sk_security_struct *newsksec = newsk->sk_security;
4378
4379 newsksec->sid = sksec->sid;
4380 newsksec->peer_sid = sksec->peer_sid;
4381 newsksec->sclass = sksec->sclass;
4382
4383 selinux_netlbl_sk_security_reset(newsksec);
4384}
4385
4386static void selinux_sk_getsecid(struct sock *sk, u32 *secid)
4387{
4388 if (!sk)
4389 *secid = SECINITSID_ANY_SOCKET;
4390 else {
4391 struct sk_security_struct *sksec = sk->sk_security;
4392
4393 *secid = sksec->sid;
4394 }
4395}
4396
4397static void selinux_sock_graft(struct sock *sk, struct socket *parent)
4398{
4399 struct inode_security_struct *isec = SOCK_INODE(parent)->i_security;
4400 struct sk_security_struct *sksec = sk->sk_security;
4401
4402 if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6 ||
4403 sk->sk_family == PF_UNIX)
4404 isec->sid = sksec->sid;
4405 sksec->sclass = isec->sclass;
4406}
4407
4408static int selinux_inet_conn_request(struct sock *sk, struct sk_buff *skb,
4409 struct request_sock *req)
4410{
4411 struct sk_security_struct *sksec = sk->sk_security;
4412 int err;
4413 u16 family = sk->sk_family;
4414 u32 newsid;
4415 u32 peersid;
4416
4417
4418 if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
4419 family = PF_INET;
4420
4421 err = selinux_skb_peerlbl_sid(skb, family, &peersid);
4422 if (err)
4423 return err;
4424 if (peersid == SECSID_NULL) {
4425 req->secid = sksec->sid;
4426 req->peer_secid = SECSID_NULL;
4427 } else {
4428 err = security_sid_mls_copy(sksec->sid, peersid, &newsid);
4429 if (err)
4430 return err;
4431 req->secid = newsid;
4432 req->peer_secid = peersid;
4433 }
4434
4435 return selinux_netlbl_inet_conn_request(req, family);
4436}
4437
4438static void selinux_inet_csk_clone(struct sock *newsk,
4439 const struct request_sock *req)
4440{
4441 struct sk_security_struct *newsksec = newsk->sk_security;
4442
4443 newsksec->sid = req->secid;
4444 newsksec->peer_sid = req->peer_secid;
4445
4446
4447
4448
4449
4450
4451
4452 selinux_netlbl_inet_csk_clone(newsk, req->rsk_ops->family);
4453}
4454
4455static void selinux_inet_conn_established(struct sock *sk, struct sk_buff *skb)
4456{
4457 u16 family = sk->sk_family;
4458 struct sk_security_struct *sksec = sk->sk_security;
4459
4460
4461 if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
4462 family = PF_INET;
4463
4464 selinux_skb_peerlbl_sid(skb, family, &sksec->peer_sid);
4465}
4466
4467static void selinux_skb_owned_by(struct sk_buff *skb, struct sock *sk)
4468{
4469 skb_set_owner_w(skb, sk);
4470}
4471
4472static int selinux_secmark_relabel_packet(u32 sid)
4473{
4474 const struct task_security_struct *__tsec;
4475 u32 tsid;
4476
4477 __tsec = current_security();
4478 tsid = __tsec->sid;
4479
4480 return avc_has_perm(tsid, sid, SECCLASS_PACKET, PACKET__RELABELTO, NULL);
4481}
4482
4483static void selinux_secmark_refcount_inc(void)
4484{
4485 atomic_inc(&selinux_secmark_refcount);
4486}
4487
4488static void selinux_secmark_refcount_dec(void)
4489{
4490 atomic_dec(&selinux_secmark_refcount);
4491}
4492
4493static void selinux_req_classify_flow(const struct request_sock *req,
4494 struct flowi *fl)
4495{
4496 fl->flowi_secid = req->secid;
4497}
4498
4499static int selinux_tun_dev_alloc_security(void **security)
4500{
4501 struct tun_security_struct *tunsec;
4502
4503 tunsec = kzalloc(sizeof(*tunsec), GFP_KERNEL);
4504 if (!tunsec)
4505 return -ENOMEM;
4506 tunsec->sid = current_sid();
4507
4508 *security = tunsec;
4509 return 0;
4510}
4511
4512static void selinux_tun_dev_free_security(void *security)
4513{
4514 kfree(security);
4515}
4516
4517static int selinux_tun_dev_create(void)
4518{
4519 u32 sid = current_sid();
4520
4521
4522
4523
4524
4525
4526
4527
4528 return avc_has_perm(sid, sid, SECCLASS_TUN_SOCKET, TUN_SOCKET__CREATE,
4529 NULL);
4530}
4531
4532static int selinux_tun_dev_attach_queue(void *security)
4533{
4534 struct tun_security_struct *tunsec = security;
4535
4536 return avc_has_perm(current_sid(), tunsec->sid, SECCLASS_TUN_SOCKET,
4537 TUN_SOCKET__ATTACH_QUEUE, NULL);
4538}
4539
4540static int selinux_tun_dev_attach(struct sock *sk, void *security)
4541{
4542 struct tun_security_struct *tunsec = security;
4543 struct sk_security_struct *sksec = sk->sk_security;
4544
4545
4546
4547
4548
4549
4550
4551
4552 sksec->sid = tunsec->sid;
4553 sksec->sclass = SECCLASS_TUN_SOCKET;
4554
4555 return 0;
4556}
4557
4558static int selinux_tun_dev_open(void *security)
4559{
4560 struct tun_security_struct *tunsec = security;
4561 u32 sid = current_sid();
4562 int err;
4563
4564 err = avc_has_perm(sid, tunsec->sid, SECCLASS_TUN_SOCKET,
4565 TUN_SOCKET__RELABELFROM, NULL);
4566 if (err)
4567 return err;
4568 err = avc_has_perm(sid, sid, SECCLASS_TUN_SOCKET,
4569 TUN_SOCKET__RELABELTO, NULL);
4570 if (err)
4571 return err;
4572 tunsec->sid = sid;
4573
4574 return 0;
4575}
4576
4577static int selinux_nlmsg_perm(struct sock *sk, struct sk_buff *skb)
4578{
4579 int err = 0;
4580 u32 perm;
4581 struct nlmsghdr *nlh;
4582 struct sk_security_struct *sksec = sk->sk_security;
4583
4584 if (skb->len < NLMSG_HDRLEN) {
4585 err = -EINVAL;
4586 goto out;
4587 }
4588 nlh = nlmsg_hdr(skb);
4589
4590 err = selinux_nlmsg_lookup(sksec->sclass, nlh->nlmsg_type, &perm);
4591 if (err) {
4592 if (err == -EINVAL) {
4593 audit_log(current->audit_context, GFP_KERNEL, AUDIT_SELINUX_ERR,
4594 "SELinux: unrecognized netlink message"
4595 " type=%hu for sclass=%hu\n",
4596 nlh->nlmsg_type, sksec->sclass);
4597 if (!selinux_enforcing || security_get_allow_unknown())
4598 err = 0;
4599 }
4600
4601
4602 if (err == -ENOENT)
4603 err = 0;
4604 goto out;
4605 }
4606
4607 err = sock_has_perm(current, sk, perm);
4608out:
4609 return err;
4610}
4611
4612#ifdef CONFIG_NETFILTER
4613
4614static unsigned int selinux_ip_forward(struct sk_buff *skb, int ifindex,
4615 u16 family)
4616{
4617 int err;
4618 char *addrp;
4619 u32 peer_sid;
4620 struct common_audit_data ad;
4621 struct lsm_network_audit net = {0,};
4622 u8 secmark_active;
4623 u8 netlbl_active;
4624 u8 peerlbl_active;
4625
4626 if (!selinux_policycap_netpeer)
4627 return NF_ACCEPT;
4628
4629 secmark_active = selinux_secmark_enabled();
4630 netlbl_active = netlbl_enabled();
4631 peerlbl_active = netlbl_active || selinux_xfrm_enabled();
4632 if (!secmark_active && !peerlbl_active)
4633 return NF_ACCEPT;
4634
4635 if (selinux_skb_peerlbl_sid(skb, family, &peer_sid) != 0)
4636 return NF_DROP;
4637
4638 ad.type = LSM_AUDIT_DATA_NET;
4639 ad.u.net = &net;
4640 ad.u.net->netif = ifindex;
4641 ad.u.net->family = family;
4642 if (selinux_parse_skb(skb, &ad, &addrp, 1, NULL) != 0)
4643 return NF_DROP;
4644
4645 if (peerlbl_active) {
4646 err = selinux_inet_sys_rcv_skb(ifindex, addrp, family,
4647 peer_sid, &ad);
4648 if (err) {
4649 selinux_netlbl_err(skb, err, 1);
4650 return NF_DROP;
4651 }
4652 }
4653
4654 if (secmark_active)
4655 if (avc_has_perm(peer_sid, skb->secmark,
4656 SECCLASS_PACKET, PACKET__FORWARD_IN, &ad))
4657 return NF_DROP;
4658
4659 if (netlbl_active)
4660
4661
4662
4663
4664 if (selinux_netlbl_skbuff_setsid(skb, family, peer_sid) != 0)
4665 return NF_DROP;
4666
4667 return NF_ACCEPT;
4668}
4669
4670static unsigned int selinux_ipv4_forward(unsigned int hooknum,
4671 struct sk_buff *skb,
4672 const struct net_device *in,
4673 const struct net_device *out,
4674 int (*okfn)(struct sk_buff *))
4675{
4676 return selinux_ip_forward(skb, in->ifindex, PF_INET);
4677}
4678
4679#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
4680static unsigned int selinux_ipv6_forward(unsigned int hooknum,
4681 struct sk_buff *skb,
4682 const struct net_device *in,
4683 const struct net_device *out,
4684 int (*okfn)(struct sk_buff *))
4685{
4686 return selinux_ip_forward(skb, in->ifindex, PF_INET6);
4687}
4688#endif
4689
4690static unsigned int selinux_ip_output(struct sk_buff *skb,
4691 u16 family)
4692{
4693 u32 sid;
4694
4695 if (!netlbl_enabled())
4696 return NF_ACCEPT;
4697
4698
4699
4700
4701 if (skb->sk) {
4702 struct sk_security_struct *sksec = skb->sk->sk_security;
4703 sid = sksec->sid;
4704 } else
4705 sid = SECINITSID_KERNEL;
4706 if (selinux_netlbl_skbuff_setsid(skb, family, sid) != 0)
4707 return NF_DROP;
4708
4709 return NF_ACCEPT;
4710}
4711
4712static unsigned int selinux_ipv4_output(unsigned int hooknum,
4713 struct sk_buff *skb,
4714 const struct net_device *in,
4715 const struct net_device *out,
4716 int (*okfn)(struct sk_buff *))
4717{
4718 return selinux_ip_output(skb, PF_INET);
4719}
4720
4721static unsigned int selinux_ip_postroute_compat(struct sk_buff *skb,
4722 int ifindex,
4723 u16 family)
4724{
4725 struct sock *sk = skb->sk;
4726 struct sk_security_struct *sksec;
4727 struct common_audit_data ad;
4728 struct lsm_network_audit net = {0,};
4729 char *addrp;
4730 u8 proto;
4731
4732 if (sk == NULL)
4733 return NF_ACCEPT;
4734 sksec = sk->sk_security;
4735
4736 ad.type = LSM_AUDIT_DATA_NET;
4737 ad.u.net = &net;
4738 ad.u.net->netif = ifindex;
4739 ad.u.net->family = family;
4740 if (selinux_parse_skb(skb, &ad, &addrp, 0, &proto))
4741 return NF_DROP;
4742
4743 if (selinux_secmark_enabled())
4744 if (avc_has_perm(sksec->sid, skb->secmark,
4745 SECCLASS_PACKET, PACKET__SEND, &ad))
4746 return NF_DROP_ERR(-ECONNREFUSED);
4747
4748 if (selinux_xfrm_postroute_last(sksec->sid, skb, &ad, proto))
4749 return NF_DROP_ERR(-ECONNREFUSED);
4750
4751 return NF_ACCEPT;
4752}
4753
4754static unsigned int selinux_ip_postroute(struct sk_buff *skb, int ifindex,
4755 u16 family)
4756{
4757 u32 secmark_perm;
4758 u32 peer_sid;
4759 struct sock *sk;
4760 struct common_audit_data ad;
4761 struct lsm_network_audit net = {0,};
4762 char *addrp;
4763 u8 secmark_active;
4764 u8 peerlbl_active;
4765
4766
4767
4768
4769
4770 if (!selinux_policycap_netpeer)
4771 return selinux_ip_postroute_compat(skb, ifindex, family);
4772#ifdef CONFIG_XFRM
4773
4774
4775
4776
4777
4778
4779 if (skb_dst(skb) != NULL && skb_dst(skb)->xfrm != NULL)
4780 return NF_ACCEPT;
4781#endif
4782 secmark_active = selinux_secmark_enabled();
4783 peerlbl_active = netlbl_enabled() || selinux_xfrm_enabled();
4784 if (!secmark_active && !peerlbl_active)
4785 return NF_ACCEPT;
4786
4787
4788
4789
4790
4791 sk = skb->sk;
4792 if (sk == NULL) {
4793 if (skb->skb_iif) {
4794 secmark_perm = PACKET__FORWARD_OUT;
4795 if (selinux_skb_peerlbl_sid(skb, family, &peer_sid))
4796 return NF_DROP;
4797 } else {
4798 secmark_perm = PACKET__SEND;
4799 peer_sid = SECINITSID_KERNEL;
4800 }
4801 } else {
4802 struct sk_security_struct *sksec = sk->sk_security;
4803 peer_sid = sksec->sid;
4804 secmark_perm = PACKET__SEND;
4805 }
4806
4807 ad.type = LSM_AUDIT_DATA_NET;
4808 ad.u.net = &net;
4809 ad.u.net->netif = ifindex;
4810 ad.u.net->family = family;
4811 if (selinux_parse_skb(skb, &ad, &addrp, 0, NULL))
4812 return NF_DROP;
4813
4814 if (secmark_active)
4815 if (avc_has_perm(peer_sid, skb->secmark,
4816 SECCLASS_PACKET, secmark_perm, &ad))
4817 return NF_DROP_ERR(-ECONNREFUSED);
4818
4819 if (peerlbl_active) {
4820 u32 if_sid;
4821 u32 node_sid;
4822
4823 if (sel_netif_sid(ifindex, &if_sid))
4824 return NF_DROP;
4825 if (avc_has_perm(peer_sid, if_sid,
4826 SECCLASS_NETIF, NETIF__EGRESS, &ad))
4827 return NF_DROP_ERR(-ECONNREFUSED);
4828
4829 if (sel_netnode_sid(addrp, family, &node_sid))
4830 return NF_DROP;
4831 if (avc_has_perm(peer_sid, node_sid,
4832 SECCLASS_NODE, NODE__SENDTO, &ad))
4833 return NF_DROP_ERR(-ECONNREFUSED);
4834 }
4835
4836 return NF_ACCEPT;
4837}
4838
4839static unsigned int selinux_ipv4_postroute(unsigned int hooknum,
4840 struct sk_buff *skb,
4841 const struct net_device *in,
4842 const struct net_device *out,
4843 int (*okfn)(struct sk_buff *))
4844{
4845 return selinux_ip_postroute(skb, out->ifindex, PF_INET);
4846}
4847
4848#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
4849static unsigned int selinux_ipv6_postroute(unsigned int hooknum,
4850 struct sk_buff *skb,
4851 const struct net_device *in,
4852 const struct net_device *out,
4853 int (*okfn)(struct sk_buff *))
4854{
4855 return selinux_ip_postroute(skb, out->ifindex, PF_INET6);
4856}
4857#endif
4858
4859#endif
4860
4861static int selinux_netlink_send(struct sock *sk, struct sk_buff *skb)
4862{
4863 int err;
4864
4865 err = cap_netlink_send(sk, skb);
4866 if (err)
4867 return err;
4868
4869 return selinux_nlmsg_perm(sk, skb);
4870}
4871
4872static int ipc_alloc_security(struct task_struct *task,
4873 struct kern_ipc_perm *perm,
4874 u16 sclass)
4875{
4876 struct ipc_security_struct *isec;
4877 u32 sid;
4878
4879 isec = kzalloc(sizeof(struct ipc_security_struct), GFP_KERNEL);
4880 if (!isec)
4881 return -ENOMEM;
4882
4883 sid = task_sid(task);
4884 isec->sclass = sclass;
4885 isec->sid = sid;
4886 perm->security = isec;
4887
4888 return 0;
4889}
4890
4891static void ipc_free_security(struct kern_ipc_perm *perm)
4892{
4893 struct ipc_security_struct *isec = perm->security;
4894 perm->security = NULL;
4895 kfree(isec);
4896}
4897
4898static int msg_msg_alloc_security(struct msg_msg *msg)
4899{
4900 struct msg_security_struct *msec;
4901
4902 msec = kzalloc(sizeof(struct msg_security_struct), GFP_KERNEL);
4903 if (!msec)
4904 return -ENOMEM;
4905
4906 msec->sid = SECINITSID_UNLABELED;
4907 msg->security = msec;
4908
4909 return 0;
4910}
4911
4912static void msg_msg_free_security(struct msg_msg *msg)
4913{
4914 struct msg_security_struct *msec = msg->security;
4915
4916 msg->security = NULL;
4917 kfree(msec);
4918}
4919
4920static int ipc_has_perm(struct kern_ipc_perm *ipc_perms,
4921 u32 perms)
4922{
4923 struct ipc_security_struct *isec;
4924 struct common_audit_data ad;
4925 u32 sid = current_sid();
4926
4927 isec = ipc_perms->security;
4928
4929 ad.type = LSM_AUDIT_DATA_IPC;
4930 ad.u.ipc_id = ipc_perms->key;
4931
4932 return avc_has_perm(sid, isec->sid, isec->sclass, perms, &ad);
4933}
4934
4935static int selinux_msg_msg_alloc_security(struct msg_msg *msg)
4936{
4937 return msg_msg_alloc_security(msg);
4938}
4939
4940static void selinux_msg_msg_free_security(struct msg_msg *msg)
4941{
4942 msg_msg_free_security(msg);
4943}
4944
4945
4946static int selinux_msg_queue_alloc_security(struct msg_queue *msq)
4947{
4948 struct ipc_security_struct *isec;
4949 struct common_audit_data ad;
4950 u32 sid = current_sid();
4951 int rc;
4952
4953 rc = ipc_alloc_security(current, &msq->q_perm, SECCLASS_MSGQ);
4954 if (rc)
4955 return rc;
4956
4957 isec = msq->q_perm.security;
4958
4959 ad.type = LSM_AUDIT_DATA_IPC;
4960 ad.u.ipc_id = msq->q_perm.key;
4961
4962 rc = avc_has_perm(sid, isec->sid, SECCLASS_MSGQ,
4963 MSGQ__CREATE, &ad);
4964 if (rc) {
4965 ipc_free_security(&msq->q_perm);
4966 return rc;
4967 }
4968 return 0;
4969}
4970
4971static void selinux_msg_queue_free_security(struct msg_queue *msq)
4972{
4973 ipc_free_security(&msq->q_perm);
4974}
4975
4976static int selinux_msg_queue_associate(struct msg_queue *msq, int msqflg)
4977{
4978 struct ipc_security_struct *isec;
4979 struct common_audit_data ad;
4980 u32 sid = current_sid();
4981
4982 isec = msq->q_perm.security;
4983
4984 ad.type = LSM_AUDIT_DATA_IPC;
4985 ad.u.ipc_id = msq->q_perm.key;
4986
4987 return avc_has_perm(sid, isec->sid, SECCLASS_MSGQ,
4988 MSGQ__ASSOCIATE, &ad);
4989}
4990
4991static int selinux_msg_queue_msgctl(struct msg_queue *msq, int cmd)
4992{
4993 int err;
4994 int perms;
4995
4996 switch (cmd) {
4997 case IPC_INFO:
4998 case MSG_INFO:
4999
5000 return task_has_system(current, SYSTEM__IPC_INFO);
5001 case IPC_STAT:
5002 case MSG_STAT:
5003 perms = MSGQ__GETATTR | MSGQ__ASSOCIATE;
5004 break;
5005 case IPC_SET:
5006 perms = MSGQ__SETATTR;
5007 break;
5008 case IPC_RMID:
5009 perms = MSGQ__DESTROY;
5010 break;
5011 default:
5012 return 0;
5013 }
5014
5015 err = ipc_has_perm(&msq->q_perm, perms);
5016 return err;
5017}
5018
5019static int selinux_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, int msqflg)
5020{
5021 struct ipc_security_struct *isec;
5022 struct msg_security_struct *msec;
5023 struct common_audit_data ad;
5024 u32 sid = current_sid();
5025 int rc;
5026
5027 isec = msq->q_perm.security;
5028 msec = msg->security;
5029
5030
5031
5032
5033 if (msec->sid == SECINITSID_UNLABELED) {
5034
5035
5036
5037
5038 rc = security_transition_sid(sid, isec->sid, SECCLASS_MSG,
5039 NULL, &msec->sid);
5040 if (rc)
5041 return rc;
5042 }
5043
5044 ad.type = LSM_AUDIT_DATA_IPC;
5045 ad.u.ipc_id = msq->q_perm.key;
5046
5047
5048 rc = avc_has_perm(sid, isec->sid, SECCLASS_MSGQ,
5049 MSGQ__WRITE, &ad);
5050 if (!rc)
5051
5052 rc = avc_has_perm(sid, msec->sid, SECCLASS_MSG,
5053 MSG__SEND, &ad);
5054 if (!rc)
5055
5056 rc = avc_has_perm(msec->sid, isec->sid, SECCLASS_MSGQ,
5057 MSGQ__ENQUEUE, &ad);
5058
5059 return rc;
5060}
5061
5062static int selinux_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
5063 struct task_struct *target,
5064 long type, int mode)
5065{
5066 struct ipc_security_struct *isec;
5067 struct msg_security_struct *msec;
5068 struct common_audit_data ad;
5069 u32 sid = task_sid(target);
5070 int rc;
5071
5072 isec = msq->q_perm.security;
5073 msec = msg->security;
5074
5075 ad.type = LSM_AUDIT_DATA_IPC;
5076 ad.u.ipc_id = msq->q_perm.key;
5077
5078 rc = avc_has_perm(sid, isec->sid,
5079 SECCLASS_MSGQ, MSGQ__READ, &ad);
5080 if (!rc)
5081 rc = avc_has_perm(sid, msec->sid,
5082 SECCLASS_MSG, MSG__RECEIVE, &ad);
5083 return rc;
5084}
5085
5086
5087static int selinux_shm_alloc_security(struct shmid_kernel *shp)
5088{
5089 struct ipc_security_struct *isec;
5090 struct common_audit_data ad;
5091 u32 sid = current_sid();
5092 int rc;
5093
5094 rc = ipc_alloc_security(current, &shp->shm_perm, SECCLASS_SHM);
5095 if (rc)
5096 return rc;
5097
5098 isec = shp->shm_perm.security;
5099
5100 ad.type = LSM_AUDIT_DATA_IPC;
5101 ad.u.ipc_id = shp->shm_perm.key;
5102
5103 rc = avc_has_perm(sid, isec->sid, SECCLASS_SHM,
5104 SHM__CREATE, &ad);
5105 if (rc) {
5106 ipc_free_security(&shp->shm_perm);
5107 return rc;
5108 }
5109 return 0;
5110}
5111
5112static void selinux_shm_free_security(struct shmid_kernel *shp)
5113{
5114 ipc_free_security(&shp->shm_perm);
5115}
5116
5117static int selinux_shm_associate(struct shmid_kernel *shp, int shmflg)
5118{
5119 struct ipc_security_struct *isec;
5120 struct common_audit_data ad;
5121 u32 sid = current_sid();
5122
5123 isec = shp->shm_perm.security;
5124
5125 ad.type = LSM_AUDIT_DATA_IPC;
5126 ad.u.ipc_id = shp->shm_perm.key;
5127
5128 return avc_has_perm(sid, isec->sid, SECCLASS_SHM,
5129 SHM__ASSOCIATE, &ad);
5130}
5131
5132
5133static int selinux_shm_shmctl(struct shmid_kernel *shp, int cmd)
5134{
5135 int perms;
5136 int err;
5137
5138 switch (cmd) {
5139 case IPC_INFO:
5140 case SHM_INFO:
5141
5142 return task_has_system(current, SYSTEM__IPC_INFO);
5143 case IPC_STAT:
5144 case SHM_STAT:
5145 perms = SHM__GETATTR | SHM__ASSOCIATE;
5146 break;
5147 case IPC_SET:
5148 perms = SHM__SETATTR;
5149 break;
5150 case SHM_LOCK:
5151 case SHM_UNLOCK:
5152 perms = SHM__LOCK;
5153 break;
5154 case IPC_RMID:
5155 perms = SHM__DESTROY;
5156 break;
5157 default:
5158 return 0;
5159 }
5160
5161 err = ipc_has_perm(&shp->shm_perm, perms);
5162 return err;
5163}
5164
5165static int selinux_shm_shmat(struct shmid_kernel *shp,
5166 char __user *shmaddr, int shmflg)
5167{
5168 u32 perms;
5169
5170 if (shmflg & SHM_RDONLY)
5171 perms = SHM__READ;
5172 else
5173 perms = SHM__READ | SHM__WRITE;
5174
5175 return ipc_has_perm(&shp->shm_perm, perms);
5176}
5177
5178
5179static int selinux_sem_alloc_security(struct sem_array *sma)
5180{
5181 struct ipc_security_struct *isec;
5182 struct common_audit_data ad;
5183 u32 sid = current_sid();
5184 int rc;
5185
5186 rc = ipc_alloc_security(current, &sma->sem_perm, SECCLASS_SEM);
5187 if (rc)
5188 return rc;
5189
5190 isec = sma->sem_perm.security;
5191
5192 ad.type = LSM_AUDIT_DATA_IPC;
5193 ad.u.ipc_id = sma->sem_perm.key;
5194
5195 rc = avc_has_perm(sid, isec->sid, SECCLASS_SEM,
5196 SEM__CREATE, &ad);
5197 if (rc) {
5198 ipc_free_security(&sma->sem_perm);
5199 return rc;
5200 }
5201 return 0;
5202}
5203
5204static void selinux_sem_free_security(struct sem_array *sma)
5205{
5206 ipc_free_security(&sma->sem_perm);
5207}
5208
5209static int selinux_sem_associate(struct sem_array *sma, int semflg)
5210{
5211 struct ipc_security_struct *isec;
5212 struct common_audit_data ad;
5213 u32 sid = current_sid();
5214
5215 isec = sma->sem_perm.security;
5216
5217 ad.type = LSM_AUDIT_DATA_IPC;
5218 ad.u.ipc_id = sma->sem_perm.key;
5219
5220 return avc_has_perm(sid, isec->sid, SECCLASS_SEM,
5221 SEM__ASSOCIATE, &ad);
5222}
5223
5224
5225static int selinux_sem_semctl(struct sem_array *sma, int cmd)
5226{
5227 int err;
5228 u32 perms;
5229
5230 switch (cmd) {
5231 case IPC_INFO:
5232 case SEM_INFO:
5233
5234 return task_has_system(current, SYSTEM__IPC_INFO);
5235 case GETPID:
5236 case GETNCNT:
5237 case GETZCNT:
5238 perms = SEM__GETATTR;
5239 break;
5240 case GETVAL:
5241 case GETALL:
5242 perms = SEM__READ;
5243 break;
5244 case SETVAL:
5245 case SETALL:
5246 perms = SEM__WRITE;
5247 break;
5248 case IPC_RMID:
5249 perms = SEM__DESTROY;
5250 break;
5251 case IPC_SET:
5252 perms = SEM__SETATTR;
5253 break;
5254 case IPC_STAT:
5255 case SEM_STAT:
5256 perms = SEM__GETATTR | SEM__ASSOCIATE;
5257 break;
5258 default:
5259 return 0;
5260 }
5261
5262 err = ipc_has_perm(&sma->sem_perm, perms);
5263 return err;
5264}
5265
5266static int selinux_sem_semop(struct sem_array *sma,
5267 struct sembuf *sops, unsigned nsops, int alter)
5268{
5269 u32 perms;
5270
5271 if (alter)
5272 perms = SEM__READ | SEM__WRITE;
5273 else
5274 perms = SEM__READ;
5275
5276 return ipc_has_perm(&sma->sem_perm, perms);
5277}
5278
5279static int selinux_ipc_permission(struct kern_ipc_perm *ipcp, short flag)
5280{
5281 u32 av = 0;
5282
5283 av = 0;
5284 if (flag & S_IRUGO)
5285 av |= IPC__UNIX_READ;
5286 if (flag & S_IWUGO)
5287 av |= IPC__UNIX_WRITE;
5288
5289 if (av == 0)
5290 return 0;
5291
5292 return ipc_has_perm(ipcp, av);
5293}
5294
5295static void selinux_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid)
5296{
5297 struct ipc_security_struct *isec = ipcp->security;
5298 *secid = isec->sid;
5299}
5300
5301static void selinux_d_instantiate(struct dentry *dentry, struct inode *inode)
5302{
5303 if (inode)
5304 inode_doinit_with_dentry(inode, dentry);
5305}
5306
5307static int selinux_getprocattr(struct task_struct *p,
5308 char *name, char **value)
5309{
5310 const struct task_security_struct *__tsec;
5311 u32 sid;
5312 int error;
5313 unsigned len;
5314
5315 if (current != p) {
5316 error = current_has_perm(p, PROCESS__GETATTR);
5317 if (error)
5318 return error;
5319 }
5320
5321 rcu_read_lock();
5322 __tsec = __task_cred(p)->security;
5323
5324 if (!strcmp(name, "current"))
5325 sid = __tsec->sid;
5326 else if (!strcmp(name, "prev"))
5327 sid = __tsec->osid;
5328 else if (!strcmp(name, "exec"))
5329 sid = __tsec->exec_sid;
5330 else if (!strcmp(name, "fscreate"))
5331 sid = __tsec->create_sid;
5332 else if (!strcmp(name, "keycreate"))
5333 sid = __tsec->keycreate_sid;
5334 else if (!strcmp(name, "sockcreate"))
5335 sid = __tsec->sockcreate_sid;
5336 else
5337 goto invalid;
5338 rcu_read_unlock();
5339
5340 if (!sid)
5341 return 0;
5342
5343 error = security_sid_to_context(sid, value, &len);
5344 if (error)
5345 return error;
5346 return len;
5347
5348invalid:
5349 rcu_read_unlock();
5350 return -EINVAL;
5351}
5352
5353static int selinux_setprocattr(struct task_struct *p,
5354 char *name, void *value, size_t size)
5355{
5356 struct task_security_struct *tsec;
5357 struct task_struct *tracer;
5358 struct cred *new;
5359 u32 sid = 0, ptsid;
5360 int error;
5361 char *str = value;
5362
5363 if (current != p) {
5364
5365
5366 return -EACCES;
5367 }
5368
5369
5370
5371
5372
5373
5374 if (!strcmp(name, "exec"))
5375 error = current_has_perm(p, PROCESS__SETEXEC);
5376 else if (!strcmp(name, "fscreate"))
5377 error = current_has_perm(p, PROCESS__SETFSCREATE);
5378 else if (!strcmp(name, "keycreate"))
5379 error = current_has_perm(p, PROCESS__SETKEYCREATE);
5380 else if (!strcmp(name, "sockcreate"))
5381 error = current_has_perm(p, PROCESS__SETSOCKCREATE);
5382 else if (!strcmp(name, "current"))
5383 error = current_has_perm(p, PROCESS__SETCURRENT);
5384 else
5385 error = -EINVAL;
5386 if (error)
5387 return error;
5388
5389
5390 if (size && str[1] && str[1] != '\n') {
5391 if (str[size-1] == '\n') {
5392 str[size-1] = 0;
5393 size--;
5394 }
5395 error = security_context_to_sid(value, size, &sid);
5396 if (error == -EINVAL && !strcmp(name, "fscreate")) {
5397 if (!capable(CAP_MAC_ADMIN)) {
5398 struct audit_buffer *ab;
5399 size_t audit_size;
5400
5401
5402
5403 if (str[size - 1] == '\0')
5404 audit_size = size - 1;
5405 else
5406 audit_size = size;
5407 ab = audit_log_start(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR);
5408 audit_log_format(ab, "op=fscreate invalid_context=");
5409 audit_log_n_untrustedstring(ab, value, audit_size);
5410 audit_log_end(ab);
5411
5412 return error;
5413 }
5414 error = security_context_to_sid_force(value, size,
5415 &sid);
5416 }
5417 if (error)
5418 return error;
5419 }
5420
5421 new = prepare_creds();
5422 if (!new)
5423 return -ENOMEM;
5424
5425
5426
5427
5428
5429
5430
5431 tsec = new->security;
5432 if (!strcmp(name, "exec")) {
5433 tsec->exec_sid = sid;
5434 } else if (!strcmp(name, "fscreate")) {
5435 tsec->create_sid = sid;
5436 } else if (!strcmp(name, "keycreate")) {
5437 error = may_create_key(sid, p);
5438 if (error)
5439 goto abort_change;
5440 tsec->keycreate_sid = sid;
5441 } else if (!strcmp(name, "sockcreate")) {
5442 tsec->sockcreate_sid = sid;
5443 } else if (!strcmp(name, "current")) {
5444 error = -EINVAL;
5445 if (sid == 0)
5446 goto abort_change;
5447
5448
5449 error = -EPERM;
5450 if (!current_is_single_threaded()) {
5451 error = security_bounded_transition(tsec->sid, sid);
5452 if (error)
5453 goto abort_change;
5454 }
5455
5456
5457 error = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS,
5458 PROCESS__DYNTRANSITION, NULL);
5459 if (error)
5460 goto abort_change;
5461
5462
5463
5464 ptsid = 0;
5465 task_lock(p);
5466 tracer = ptrace_parent(p);
5467 if (tracer)
5468 ptsid = task_sid(tracer);
5469 task_unlock(p);
5470
5471 if (tracer) {
5472 error = avc_has_perm(ptsid, sid, SECCLASS_PROCESS,
5473 PROCESS__PTRACE, NULL);
5474 if (error)
5475 goto abort_change;
5476 }
5477
5478 tsec->sid = sid;
5479 } else {
5480 error = -EINVAL;
5481 goto abort_change;
5482 }
5483
5484 commit_creds(new);
5485 return size;
5486
5487abort_change:
5488 abort_creds(new);
5489 return error;
5490}
5491
5492static int selinux_ismaclabel(const char *name)
5493{
5494 return (strcmp(name, XATTR_SELINUX_SUFFIX) == 0);
5495}
5496
5497static int selinux_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
5498{
5499 return security_sid_to_context(secid, secdata, seclen);
5500}
5501
5502static int selinux_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
5503{
5504 return security_context_to_sid(secdata, seclen, secid);
5505}
5506
5507static void selinux_release_secctx(char *secdata, u32 seclen)
5508{
5509 kfree(secdata);
5510}
5511
5512
5513
5514
5515static int selinux_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
5516{
5517 return selinux_inode_setsecurity(inode, XATTR_SELINUX_SUFFIX, ctx, ctxlen, 0);
5518}
5519
5520
5521
5522
5523static int selinux_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
5524{
5525 return __vfs_setxattr_noperm(dentry, XATTR_NAME_SELINUX, ctx, ctxlen, 0);
5526}
5527
5528static int selinux_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
5529{
5530 int len = 0;
5531 len = selinux_inode_getsecurity(inode, XATTR_SELINUX_SUFFIX,
5532 ctx, true);
5533 if (len < 0)
5534 return len;
5535 *ctxlen = len;
5536 return 0;
5537}
5538#ifdef CONFIG_KEYS
5539
5540static int selinux_key_alloc(struct key *k, const struct cred *cred,
5541 unsigned long flags)
5542{
5543 const struct task_security_struct *tsec;
5544 struct key_security_struct *ksec;
5545
5546 ksec = kzalloc(sizeof(struct key_security_struct), GFP_KERNEL);
5547 if (!ksec)
5548 return -ENOMEM;
5549
5550 tsec = cred->security;
5551 if (tsec->keycreate_sid)
5552 ksec->sid = tsec->keycreate_sid;
5553 else
5554 ksec->sid = tsec->sid;
5555
5556 k->security = ksec;
5557 return 0;
5558}
5559
5560static void selinux_key_free(struct key *k)
5561{
5562 struct key_security_struct *ksec = k->security;
5563
5564 k->security = NULL;
5565 kfree(ksec);
5566}
5567
5568static int selinux_key_permission(key_ref_t key_ref,
5569 const struct cred *cred,
5570 key_perm_t perm)
5571{
5572 struct key *key;
5573 struct key_security_struct *ksec;
5574 u32 sid;
5575
5576
5577
5578
5579 if (perm == 0)
5580 return 0;
5581
5582 sid = cred_sid(cred);
5583
5584 key = key_ref_to_ptr(key_ref);
5585 ksec = key->security;
5586
5587 return avc_has_perm(sid, ksec->sid, SECCLASS_KEY, perm, NULL);
5588}
5589
5590static int selinux_key_getsecurity(struct key *key, char **_buffer)
5591{
5592 struct key_security_struct *ksec = key->security;
5593 char *context = NULL;
5594 unsigned len;
5595 int rc;
5596
5597 rc = security_sid_to_context(ksec->sid, &context, &len);
5598 if (!rc)
5599 rc = len;
5600 *_buffer = context;
5601 return rc;
5602}
5603
5604#endif
5605
5606static struct security_operations selinux_ops = {
5607 .name = "selinux",
5608
5609 .ptrace_access_check = selinux_ptrace_access_check,
5610 .ptrace_traceme = selinux_ptrace_traceme,
5611 .capget = selinux_capget,
5612 .capset = selinux_capset,
5613 .capable = selinux_capable,
5614 .quotactl = selinux_quotactl,
5615 .quota_on = selinux_quota_on,
5616 .syslog = selinux_syslog,
5617 .vm_enough_memory = selinux_vm_enough_memory,
5618
5619 .netlink_send = selinux_netlink_send,
5620
5621 .bprm_set_creds = selinux_bprm_set_creds,
5622 .bprm_committing_creds = selinux_bprm_committing_creds,
5623 .bprm_committed_creds = selinux_bprm_committed_creds,
5624 .bprm_secureexec = selinux_bprm_secureexec,
5625
5626 .sb_alloc_security = selinux_sb_alloc_security,
5627 .sb_free_security = selinux_sb_free_security,
5628 .sb_copy_data = selinux_sb_copy_data,
5629 .sb_remount = selinux_sb_remount,
5630 .sb_kern_mount = selinux_sb_kern_mount,
5631 .sb_show_options = selinux_sb_show_options,
5632 .sb_statfs = selinux_sb_statfs,
5633 .sb_mount = selinux_mount,
5634 .sb_umount = selinux_umount,
5635 .sb_set_mnt_opts = selinux_set_mnt_opts,
5636 .sb_clone_mnt_opts = selinux_sb_clone_mnt_opts,
5637 .sb_parse_opts_str = selinux_parse_opts_str,
5638
5639 .dentry_init_security = selinux_dentry_init_security,
5640
5641 .inode_alloc_security = selinux_inode_alloc_security,
5642 .inode_free_security = selinux_inode_free_security,
5643 .inode_init_security = selinux_inode_init_security,
5644 .inode_create = selinux_inode_create,
5645 .inode_link = selinux_inode_link,
5646 .inode_unlink = selinux_inode_unlink,
5647 .inode_symlink = selinux_inode_symlink,
5648 .inode_mkdir = selinux_inode_mkdir,
5649 .inode_rmdir = selinux_inode_rmdir,
5650 .inode_mknod = selinux_inode_mknod,
5651 .inode_rename = selinux_inode_rename,
5652 .inode_readlink = selinux_inode_readlink,
5653 .inode_follow_link = selinux_inode_follow_link,
5654 .inode_permission = selinux_inode_permission,
5655 .inode_setattr = selinux_inode_setattr,
5656 .inode_getattr = selinux_inode_getattr,
5657 .inode_setxattr = selinux_inode_setxattr,
5658 .inode_post_setxattr = selinux_inode_post_setxattr,
5659 .inode_getxattr = selinux_inode_getxattr,
5660 .inode_listxattr = selinux_inode_listxattr,
5661 .inode_removexattr = selinux_inode_removexattr,
5662 .inode_getsecurity = selinux_inode_getsecurity,
5663 .inode_setsecurity = selinux_inode_setsecurity,
5664 .inode_listsecurity = selinux_inode_listsecurity,
5665 .inode_getsecid = selinux_inode_getsecid,
5666
5667 .file_permission = selinux_file_permission,
5668 .file_alloc_security = selinux_file_alloc_security,
5669 .file_free_security = selinux_file_free_security,
5670 .file_ioctl = selinux_file_ioctl,
5671 .mmap_file = selinux_mmap_file,
5672 .mmap_addr = selinux_mmap_addr,
5673 .file_mprotect = selinux_file_mprotect,
5674 .file_lock = selinux_file_lock,
5675 .file_fcntl = selinux_file_fcntl,
5676 .file_set_fowner = selinux_file_set_fowner,
5677 .file_send_sigiotask = selinux_file_send_sigiotask,
5678 .file_receive = selinux_file_receive,
5679
5680 .file_open = selinux_file_open,
5681
5682 .task_create = selinux_task_create,
5683 .cred_alloc_blank = selinux_cred_alloc_blank,
5684 .cred_free = selinux_cred_free,
5685 .cred_prepare = selinux_cred_prepare,
5686 .cred_transfer = selinux_cred_transfer,
5687 .kernel_act_as = selinux_kernel_act_as,
5688 .kernel_create_files_as = selinux_kernel_create_files_as,
5689 .kernel_module_request = selinux_kernel_module_request,
5690 .task_setpgid = selinux_task_setpgid,
5691 .task_getpgid = selinux_task_getpgid,
5692 .task_getsid = selinux_task_getsid,
5693 .task_getsecid = selinux_task_getsecid,
5694 .task_setnice = selinux_task_setnice,
5695 .task_setioprio = selinux_task_setioprio,
5696 .task_getioprio = selinux_task_getioprio,
5697 .task_setrlimit = selinux_task_setrlimit,
5698 .task_setscheduler = selinux_task_setscheduler,
5699 .task_getscheduler = selinux_task_getscheduler,
5700 .task_movememory = selinux_task_movememory,
5701 .task_kill = selinux_task_kill,
5702 .task_wait = selinux_task_wait,
5703 .task_to_inode = selinux_task_to_inode,
5704
5705 .ipc_permission = selinux_ipc_permission,
5706 .ipc_getsecid = selinux_ipc_getsecid,
5707
5708 .msg_msg_alloc_security = selinux_msg_msg_alloc_security,
5709 .msg_msg_free_security = selinux_msg_msg_free_security,
5710
5711 .msg_queue_alloc_security = selinux_msg_queue_alloc_security,
5712 .msg_queue_free_security = selinux_msg_queue_free_security,
5713 .msg_queue_associate = selinux_msg_queue_associate,
5714 .msg_queue_msgctl = selinux_msg_queue_msgctl,
5715 .msg_queue_msgsnd = selinux_msg_queue_msgsnd,
5716 .msg_queue_msgrcv = selinux_msg_queue_msgrcv,
5717
5718 .shm_alloc_security = selinux_shm_alloc_security,
5719 .shm_free_security = selinux_shm_free_security,
5720 .shm_associate = selinux_shm_associate,
5721 .shm_shmctl = selinux_shm_shmctl,
5722 .shm_shmat = selinux_shm_shmat,
5723
5724 .sem_alloc_security = selinux_sem_alloc_security,
5725 .sem_free_security = selinux_sem_free_security,
5726 .sem_associate = selinux_sem_associate,
5727 .sem_semctl = selinux_sem_semctl,
5728 .sem_semop = selinux_sem_semop,
5729
5730 .d_instantiate = selinux_d_instantiate,
5731
5732 .getprocattr = selinux_getprocattr,
5733 .setprocattr = selinux_setprocattr,
5734
5735 .ismaclabel = selinux_ismaclabel,
5736 .secid_to_secctx = selinux_secid_to_secctx,
5737 .secctx_to_secid = selinux_secctx_to_secid,
5738 .release_secctx = selinux_release_secctx,
5739 .inode_notifysecctx = selinux_inode_notifysecctx,
5740 .inode_setsecctx = selinux_inode_setsecctx,
5741 .inode_getsecctx = selinux_inode_getsecctx,
5742
5743 .unix_stream_connect = selinux_socket_unix_stream_connect,
5744 .unix_may_send = selinux_socket_unix_may_send,
5745
5746 .socket_create = selinux_socket_create,
5747 .socket_post_create = selinux_socket_post_create,
5748 .socket_bind = selinux_socket_bind,
5749 .socket_connect = selinux_socket_connect,
5750 .socket_listen = selinux_socket_listen,
5751 .socket_accept = selinux_socket_accept,
5752 .socket_sendmsg = selinux_socket_sendmsg,
5753 .socket_recvmsg = selinux_socket_recvmsg,
5754 .socket_getsockname = selinux_socket_getsockname,
5755 .socket_getpeername = selinux_socket_getpeername,
5756 .socket_getsockopt = selinux_socket_getsockopt,
5757 .socket_setsockopt = selinux_socket_setsockopt,
5758 .socket_shutdown = selinux_socket_shutdown,
5759 .socket_sock_rcv_skb = selinux_socket_sock_rcv_skb,
5760 .socket_getpeersec_stream = selinux_socket_getpeersec_stream,
5761 .socket_getpeersec_dgram = selinux_socket_getpeersec_dgram,
5762 .sk_alloc_security = selinux_sk_alloc_security,
5763 .sk_free_security = selinux_sk_free_security,
5764 .sk_clone_security = selinux_sk_clone_security,
5765 .sk_getsecid = selinux_sk_getsecid,
5766 .sock_graft = selinux_sock_graft,
5767 .inet_conn_request = selinux_inet_conn_request,
5768 .inet_csk_clone = selinux_inet_csk_clone,
5769 .inet_conn_established = selinux_inet_conn_established,
5770 .secmark_relabel_packet = selinux_secmark_relabel_packet,
5771 .secmark_refcount_inc = selinux_secmark_refcount_inc,
5772 .secmark_refcount_dec = selinux_secmark_refcount_dec,
5773 .req_classify_flow = selinux_req_classify_flow,
5774 .tun_dev_alloc_security = selinux_tun_dev_alloc_security,
5775 .tun_dev_free_security = selinux_tun_dev_free_security,
5776 .tun_dev_create = selinux_tun_dev_create,
5777 .tun_dev_attach_queue = selinux_tun_dev_attach_queue,
5778 .tun_dev_attach = selinux_tun_dev_attach,
5779 .tun_dev_open = selinux_tun_dev_open,
5780 .skb_owned_by = selinux_skb_owned_by,
5781
5782#ifdef CONFIG_SECURITY_NETWORK_XFRM
5783 .xfrm_policy_alloc_security = selinux_xfrm_policy_alloc,
5784 .xfrm_policy_clone_security = selinux_xfrm_policy_clone,
5785 .xfrm_policy_free_security = selinux_xfrm_policy_free,
5786 .xfrm_policy_delete_security = selinux_xfrm_policy_delete,
5787 .xfrm_state_alloc_security = selinux_xfrm_state_alloc,
5788 .xfrm_state_free_security = selinux_xfrm_state_free,
5789 .xfrm_state_delete_security = selinux_xfrm_state_delete,
5790 .xfrm_policy_lookup = selinux_xfrm_policy_lookup,
5791 .xfrm_state_pol_flow_match = selinux_xfrm_state_pol_flow_match,
5792 .xfrm_decode_session = selinux_xfrm_decode_session,
5793#endif
5794
5795#ifdef CONFIG_KEYS
5796 .key_alloc = selinux_key_alloc,
5797 .key_free = selinux_key_free,
5798 .key_permission = selinux_key_permission,
5799 .key_getsecurity = selinux_key_getsecurity,
5800#endif
5801
5802#ifdef CONFIG_AUDIT
5803 .audit_rule_init = selinux_audit_rule_init,
5804 .audit_rule_known = selinux_audit_rule_known,
5805 .audit_rule_match = selinux_audit_rule_match,
5806 .audit_rule_free = selinux_audit_rule_free,
5807#endif
5808};
5809
5810static __init int selinux_init(void)
5811{
5812 if (!security_module_enable(&selinux_ops)) {
5813 selinux_enabled = 0;
5814 return 0;
5815 }
5816
5817 if (!selinux_enabled) {
5818 printk(KERN_INFO "SELinux: Disabled at boot.\n");
5819 return 0;
5820 }
5821
5822 printk(KERN_INFO "SELinux: Initializing.\n");
5823
5824
5825 cred_init_security();
5826
5827 default_noexec = !(VM_DATA_DEFAULT_FLAGS & VM_EXEC);
5828
5829 sel_inode_cache = kmem_cache_create("selinux_inode_security",
5830 sizeof(struct inode_security_struct),
5831 0, SLAB_PANIC, NULL);
5832 avc_init();
5833
5834 if (register_security(&selinux_ops))
5835 panic("SELinux: Unable to register with kernel.\n");
5836
5837 if (selinux_enforcing)
5838 printk(KERN_DEBUG "SELinux: Starting in enforcing mode\n");
5839 else
5840 printk(KERN_DEBUG "SELinux: Starting in permissive mode\n");
5841
5842 return 0;
5843}
5844
5845static void delayed_superblock_init(struct super_block *sb, void *unused)
5846{
5847 superblock_doinit(sb, NULL);
5848}
5849
5850void selinux_complete_init(void)
5851{
5852 printk(KERN_DEBUG "SELinux: Completing initialization.\n");
5853
5854
5855 printk(KERN_DEBUG "SELinux: Setting up existing superblocks.\n");
5856 iterate_supers(delayed_superblock_init, NULL);
5857}
5858
5859
5860
5861security_initcall(selinux_init);
5862
5863#if defined(CONFIG_NETFILTER)
5864
5865static struct nf_hook_ops selinux_ipv4_ops[] = {
5866 {
5867 .hook = selinux_ipv4_postroute,
5868 .owner = THIS_MODULE,
5869 .pf = NFPROTO_IPV4,
5870 .hooknum = NF_INET_POST_ROUTING,
5871 .priority = NF_IP_PRI_SELINUX_LAST,
5872 },
5873 {
5874 .hook = selinux_ipv4_forward,
5875 .owner = THIS_MODULE,
5876 .pf = NFPROTO_IPV4,
5877 .hooknum = NF_INET_FORWARD,
5878 .priority = NF_IP_PRI_SELINUX_FIRST,
5879 },
5880 {
5881 .hook = selinux_ipv4_output,
5882 .owner = THIS_MODULE,
5883 .pf = NFPROTO_IPV4,
5884 .hooknum = NF_INET_LOCAL_OUT,
5885 .priority = NF_IP_PRI_SELINUX_FIRST,
5886 }
5887};
5888
5889#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
5890
5891static struct nf_hook_ops selinux_ipv6_ops[] = {
5892 {
5893 .hook = selinux_ipv6_postroute,
5894 .owner = THIS_MODULE,
5895 .pf = NFPROTO_IPV6,
5896 .hooknum = NF_INET_POST_ROUTING,
5897 .priority = NF_IP6_PRI_SELINUX_LAST,
5898 },
5899 {
5900 .hook = selinux_ipv6_forward,
5901 .owner = THIS_MODULE,
5902 .pf = NFPROTO_IPV6,
5903 .hooknum = NF_INET_FORWARD,
5904 .priority = NF_IP6_PRI_SELINUX_FIRST,
5905 }
5906};
5907
5908#endif
5909
5910static int __init selinux_nf_ip_init(void)
5911{
5912 int err = 0;
5913
5914 if (!selinux_enabled)
5915 goto out;
5916
5917 printk(KERN_DEBUG "SELinux: Registering netfilter hooks\n");
5918
5919 err = nf_register_hooks(selinux_ipv4_ops, ARRAY_SIZE(selinux_ipv4_ops));
5920 if (err)
5921 panic("SELinux: nf_register_hooks for IPv4: error %d\n", err);
5922
5923#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
5924 err = nf_register_hooks(selinux_ipv6_ops, ARRAY_SIZE(selinux_ipv6_ops));
5925 if (err)
5926 panic("SELinux: nf_register_hooks for IPv6: error %d\n", err);
5927#endif
5928
5929out:
5930 return err;
5931}
5932
5933__initcall(selinux_nf_ip_init);
5934
5935#ifdef CONFIG_SECURITY_SELINUX_DISABLE
5936static void selinux_nf_ip_exit(void)
5937{
5938 printk(KERN_DEBUG "SELinux: Unregistering netfilter hooks\n");
5939
5940 nf_unregister_hooks(selinux_ipv4_ops, ARRAY_SIZE(selinux_ipv4_ops));
5941#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
5942 nf_unregister_hooks(selinux_ipv6_ops, ARRAY_SIZE(selinux_ipv6_ops));
5943#endif
5944}
5945#endif
5946
5947#else
5948
5949#ifdef CONFIG_SECURITY_SELINUX_DISABLE
5950#define selinux_nf_ip_exit()
5951#endif
5952
5953#endif
5954
5955#ifdef CONFIG_SECURITY_SELINUX_DISABLE
5956static int selinux_disabled;
5957
5958int selinux_disable(void)
5959{
5960 if (ss_initialized) {
5961
5962 return -EINVAL;
5963 }
5964
5965 if (selinux_disabled) {
5966
5967 return -EINVAL;
5968 }
5969
5970 printk(KERN_INFO "SELinux: Disabled at runtime.\n");
5971
5972 selinux_disabled = 1;
5973 selinux_enabled = 0;
5974
5975 reset_security_ops();
5976
5977
5978 avc_disable();
5979
5980
5981 selinux_nf_ip_exit();
5982
5983
5984 exit_sel_fs();
5985
5986 return 0;
5987}
5988#endif
5989