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[MLSXFRM]: Add flow labeling
[deliverable/linux.git] / security / selinux / hooks.c
1 /*
2 * NSA Security-Enhanced Linux (SELinux) security module
3 *
4 * This file contains the SELinux hook function implementations.
5 *
6 * Authors: Stephen Smalley, <sds@epoch.ncsc.mil>
7 * Chris Vance, <cvance@nai.com>
8 * Wayne Salamon, <wsalamon@nai.com>
9 * James Morris <jmorris@redhat.com>
10 *
11 * Copyright (C) 2001,2002 Networks Associates Technology, Inc.
12 * Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com>
13 * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
14 * <dgoeddel@trustedcs.com>
15 *
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License version 2,
18 * as published by the Free Software Foundation.
19 */
20
21 #include <linux/module.h>
22 #include <linux/init.h>
23 #include <linux/kernel.h>
24 #include <linux/ptrace.h>
25 #include <linux/errno.h>
26 #include <linux/sched.h>
27 #include <linux/security.h>
28 #include <linux/xattr.h>
29 #include <linux/capability.h>
30 #include <linux/unistd.h>
31 #include <linux/mm.h>
32 #include <linux/mman.h>
33 #include <linux/slab.h>
34 #include <linux/pagemap.h>
35 #include <linux/swap.h>
36 #include <linux/smp_lock.h>
37 #include <linux/spinlock.h>
38 #include <linux/syscalls.h>
39 #include <linux/file.h>
40 #include <linux/namei.h>
41 #include <linux/mount.h>
42 #include <linux/ext2_fs.h>
43 #include <linux/proc_fs.h>
44 #include <linux/kd.h>
45 #include <linux/netfilter_ipv4.h>
46 #include <linux/netfilter_ipv6.h>
47 #include <linux/tty.h>
48 #include <net/icmp.h>
49 #include <net/ip.h> /* for sysctl_local_port_range[] */
50 #include <net/tcp.h> /* struct or_callable used in sock_rcv_skb */
51 #include <asm/uaccess.h>
52 #include <asm/semaphore.h>
53 #include <asm/ioctls.h>
54 #include <linux/bitops.h>
55 #include <linux/interrupt.h>
56 #include <linux/netdevice.h> /* for network interface checks */
57 #include <linux/netlink.h>
58 #include <linux/tcp.h>
59 #include <linux/udp.h>
60 #include <linux/quota.h>
61 #include <linux/un.h> /* for Unix socket types */
62 #include <net/af_unix.h> /* for Unix socket types */
63 #include <linux/parser.h>
64 #include <linux/nfs_mount.h>
65 #include <net/ipv6.h>
66 #include <linux/hugetlb.h>
67 #include <linux/personality.h>
68 #include <linux/sysctl.h>
69 #include <linux/audit.h>
70 #include <linux/string.h>
71 #include <linux/selinux.h>
72
73 #include "avc.h"
74 #include "objsec.h"
75 #include "netif.h"
76 #include "xfrm.h"
77
78 #define XATTR_SELINUX_SUFFIX "selinux"
79 #define XATTR_NAME_SELINUX XATTR_SECURITY_PREFIX XATTR_SELINUX_SUFFIX
80
81 extern unsigned int policydb_loaded_version;
82 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
83 extern int selinux_compat_net;
84
85 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
86 int selinux_enforcing = 0;
87
88 static int __init enforcing_setup(char *str)
89 {
90 selinux_enforcing = simple_strtol(str,NULL,0);
91 return 1;
92 }
93 __setup("enforcing=", enforcing_setup);
94 #endif
95
96 #ifdef CONFIG_SECURITY_SELINUX_BOOTPARAM
97 int selinux_enabled = CONFIG_SECURITY_SELINUX_BOOTPARAM_VALUE;
98
99 static int __init selinux_enabled_setup(char *str)
100 {
101 selinux_enabled = simple_strtol(str, NULL, 0);
102 return 1;
103 }
104 __setup("selinux=", selinux_enabled_setup);
105 #else
106 int selinux_enabled = 1;
107 #endif
108
109 /* Original (dummy) security module. */
110 static struct security_operations *original_ops = NULL;
111
112 /* Minimal support for a secondary security module,
113 just to allow the use of the dummy or capability modules.
114 The owlsm module can alternatively be used as a secondary
115 module as long as CONFIG_OWLSM_FD is not enabled. */
116 static struct security_operations *secondary_ops = NULL;
117
118 /* Lists of inode and superblock security structures initialized
119 before the policy was loaded. */
120 static LIST_HEAD(superblock_security_head);
121 static DEFINE_SPINLOCK(sb_security_lock);
122
123 static kmem_cache_t *sel_inode_cache;
124
125 /* Return security context for a given sid or just the context
126 length if the buffer is null or length is 0 */
127 static int selinux_getsecurity(u32 sid, void *buffer, size_t size)
128 {
129 char *context;
130 unsigned len;
131 int rc;
132
133 rc = security_sid_to_context(sid, &context, &len);
134 if (rc)
135 return rc;
136
137 if (!buffer || !size)
138 goto getsecurity_exit;
139
140 if (size < len) {
141 len = -ERANGE;
142 goto getsecurity_exit;
143 }
144 memcpy(buffer, context, len);
145
146 getsecurity_exit:
147 kfree(context);
148 return len;
149 }
150
151 /* Allocate and free functions for each kind of security blob. */
152
153 static int task_alloc_security(struct task_struct *task)
154 {
155 struct task_security_struct *tsec;
156
157 tsec = kzalloc(sizeof(struct task_security_struct), GFP_KERNEL);
158 if (!tsec)
159 return -ENOMEM;
160
161 tsec->task = task;
162 tsec->osid = tsec->sid = tsec->ptrace_sid = SECINITSID_UNLABELED;
163 task->security = tsec;
164
165 return 0;
166 }
167
168 static void task_free_security(struct task_struct *task)
169 {
170 struct task_security_struct *tsec = task->security;
171 task->security = NULL;
172 kfree(tsec);
173 }
174
175 static int inode_alloc_security(struct inode *inode)
176 {
177 struct task_security_struct *tsec = current->security;
178 struct inode_security_struct *isec;
179
180 isec = kmem_cache_alloc(sel_inode_cache, SLAB_KERNEL);
181 if (!isec)
182 return -ENOMEM;
183
184 memset(isec, 0, sizeof(*isec));
185 init_MUTEX(&isec->sem);
186 INIT_LIST_HEAD(&isec->list);
187 isec->inode = inode;
188 isec->sid = SECINITSID_UNLABELED;
189 isec->sclass = SECCLASS_FILE;
190 isec->task_sid = tsec->sid;
191 inode->i_security = isec;
192
193 return 0;
194 }
195
196 static void inode_free_security(struct inode *inode)
197 {
198 struct inode_security_struct *isec = inode->i_security;
199 struct superblock_security_struct *sbsec = inode->i_sb->s_security;
200
201 spin_lock(&sbsec->isec_lock);
202 if (!list_empty(&isec->list))
203 list_del_init(&isec->list);
204 spin_unlock(&sbsec->isec_lock);
205
206 inode->i_security = NULL;
207 kmem_cache_free(sel_inode_cache, isec);
208 }
209
210 static int file_alloc_security(struct file *file)
211 {
212 struct task_security_struct *tsec = current->security;
213 struct file_security_struct *fsec;
214
215 fsec = kzalloc(sizeof(struct file_security_struct), GFP_KERNEL);
216 if (!fsec)
217 return -ENOMEM;
218
219 fsec->file = file;
220 fsec->sid = tsec->sid;
221 fsec->fown_sid = tsec->sid;
222 file->f_security = fsec;
223
224 return 0;
225 }
226
227 static void file_free_security(struct file *file)
228 {
229 struct file_security_struct *fsec = file->f_security;
230 file->f_security = NULL;
231 kfree(fsec);
232 }
233
234 static int superblock_alloc_security(struct super_block *sb)
235 {
236 struct superblock_security_struct *sbsec;
237
238 sbsec = kzalloc(sizeof(struct superblock_security_struct), GFP_KERNEL);
239 if (!sbsec)
240 return -ENOMEM;
241
242 init_MUTEX(&sbsec->sem);
243 INIT_LIST_HEAD(&sbsec->list);
244 INIT_LIST_HEAD(&sbsec->isec_head);
245 spin_lock_init(&sbsec->isec_lock);
246 sbsec->sb = sb;
247 sbsec->sid = SECINITSID_UNLABELED;
248 sbsec->def_sid = SECINITSID_FILE;
249 sbsec->mntpoint_sid = SECINITSID_UNLABELED;
250 sb->s_security = sbsec;
251
252 return 0;
253 }
254
255 static void superblock_free_security(struct super_block *sb)
256 {
257 struct superblock_security_struct *sbsec = sb->s_security;
258
259 spin_lock(&sb_security_lock);
260 if (!list_empty(&sbsec->list))
261 list_del_init(&sbsec->list);
262 spin_unlock(&sb_security_lock);
263
264 sb->s_security = NULL;
265 kfree(sbsec);
266 }
267
268 static int sk_alloc_security(struct sock *sk, int family, gfp_t priority)
269 {
270 struct sk_security_struct *ssec;
271
272 ssec = kzalloc(sizeof(*ssec), priority);
273 if (!ssec)
274 return -ENOMEM;
275
276 ssec->sk = sk;
277 ssec->peer_sid = SECINITSID_UNLABELED;
278 ssec->sid = SECINITSID_UNLABELED;
279 sk->sk_security = ssec;
280
281 return 0;
282 }
283
284 static void sk_free_security(struct sock *sk)
285 {
286 struct sk_security_struct *ssec = sk->sk_security;
287
288 sk->sk_security = NULL;
289 kfree(ssec);
290 }
291
292 /* The security server must be initialized before
293 any labeling or access decisions can be provided. */
294 extern int ss_initialized;
295
296 /* The file system's label must be initialized prior to use. */
297
298 static char *labeling_behaviors[6] = {
299 "uses xattr",
300 "uses transition SIDs",
301 "uses task SIDs",
302 "uses genfs_contexts",
303 "not configured for labeling",
304 "uses mountpoint labeling",
305 };
306
307 static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry);
308
309 static inline int inode_doinit(struct inode *inode)
310 {
311 return inode_doinit_with_dentry(inode, NULL);
312 }
313
314 enum {
315 Opt_context = 1,
316 Opt_fscontext = 2,
317 Opt_defcontext = 4,
318 Opt_rootcontext = 8,
319 };
320
321 static match_table_t tokens = {
322 {Opt_context, "context=%s"},
323 {Opt_fscontext, "fscontext=%s"},
324 {Opt_defcontext, "defcontext=%s"},
325 {Opt_rootcontext, "rootcontext=%s"},
326 };
327
328 #define SEL_MOUNT_FAIL_MSG "SELinux: duplicate or incompatible mount options\n"
329
330 static int may_context_mount_sb_relabel(u32 sid,
331 struct superblock_security_struct *sbsec,
332 struct task_security_struct *tsec)
333 {
334 int rc;
335
336 rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM,
337 FILESYSTEM__RELABELFROM, NULL);
338 if (rc)
339 return rc;
340
341 rc = avc_has_perm(tsec->sid, sid, SECCLASS_FILESYSTEM,
342 FILESYSTEM__RELABELTO, NULL);
343 return rc;
344 }
345
346 static int may_context_mount_inode_relabel(u32 sid,
347 struct superblock_security_struct *sbsec,
348 struct task_security_struct *tsec)
349 {
350 int rc;
351 rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM,
352 FILESYSTEM__RELABELFROM, NULL);
353 if (rc)
354 return rc;
355
356 rc = avc_has_perm(sid, sbsec->sid, SECCLASS_FILESYSTEM,
357 FILESYSTEM__ASSOCIATE, NULL);
358 return rc;
359 }
360
361 static int try_context_mount(struct super_block *sb, void *data)
362 {
363 char *context = NULL, *defcontext = NULL;
364 char *fscontext = NULL, *rootcontext = NULL;
365 const char *name;
366 u32 sid;
367 int alloc = 0, rc = 0, seen = 0;
368 struct task_security_struct *tsec = current->security;
369 struct superblock_security_struct *sbsec = sb->s_security;
370
371 if (!data)
372 goto out;
373
374 name = sb->s_type->name;
375
376 if (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA) {
377
378 /* NFS we understand. */
379 if (!strcmp(name, "nfs")) {
380 struct nfs_mount_data *d = data;
381
382 if (d->version < NFS_MOUNT_VERSION)
383 goto out;
384
385 if (d->context[0]) {
386 context = d->context;
387 seen |= Opt_context;
388 }
389 } else
390 goto out;
391
392 } else {
393 /* Standard string-based options. */
394 char *p, *options = data;
395
396 while ((p = strsep(&options, ",")) != NULL) {
397 int token;
398 substring_t args[MAX_OPT_ARGS];
399
400 if (!*p)
401 continue;
402
403 token = match_token(p, tokens, args);
404
405 switch (token) {
406 case Opt_context:
407 if (seen & (Opt_context|Opt_defcontext)) {
408 rc = -EINVAL;
409 printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
410 goto out_free;
411 }
412 context = match_strdup(&args[0]);
413 if (!context) {
414 rc = -ENOMEM;
415 goto out_free;
416 }
417 if (!alloc)
418 alloc = 1;
419 seen |= Opt_context;
420 break;
421
422 case Opt_fscontext:
423 if (seen & Opt_fscontext) {
424 rc = -EINVAL;
425 printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
426 goto out_free;
427 }
428 fscontext = match_strdup(&args[0]);
429 if (!fscontext) {
430 rc = -ENOMEM;
431 goto out_free;
432 }
433 if (!alloc)
434 alloc = 1;
435 seen |= Opt_fscontext;
436 break;
437
438 case Opt_rootcontext:
439 if (seen & Opt_rootcontext) {
440 rc = -EINVAL;
441 printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
442 goto out_free;
443 }
444 rootcontext = match_strdup(&args[0]);
445 if (!rootcontext) {
446 rc = -ENOMEM;
447 goto out_free;
448 }
449 if (!alloc)
450 alloc = 1;
451 seen |= Opt_rootcontext;
452 break;
453
454 case Opt_defcontext:
455 if (sbsec->behavior != SECURITY_FS_USE_XATTR) {
456 rc = -EINVAL;
457 printk(KERN_WARNING "SELinux: "
458 "defcontext option is invalid "
459 "for this filesystem type\n");
460 goto out_free;
461 }
462 if (seen & (Opt_context|Opt_defcontext)) {
463 rc = -EINVAL;
464 printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
465 goto out_free;
466 }
467 defcontext = match_strdup(&args[0]);
468 if (!defcontext) {
469 rc = -ENOMEM;
470 goto out_free;
471 }
472 if (!alloc)
473 alloc = 1;
474 seen |= Opt_defcontext;
475 break;
476
477 default:
478 rc = -EINVAL;
479 printk(KERN_WARNING "SELinux: unknown mount "
480 "option\n");
481 goto out_free;
482
483 }
484 }
485 }
486
487 if (!seen)
488 goto out;
489
490 /* sets the context of the superblock for the fs being mounted. */
491 if (fscontext) {
492 rc = security_context_to_sid(fscontext, strlen(fscontext), &sid);
493 if (rc) {
494 printk(KERN_WARNING "SELinux: security_context_to_sid"
495 "(%s) failed for (dev %s, type %s) errno=%d\n",
496 fscontext, sb->s_id, name, rc);
497 goto out_free;
498 }
499
500 rc = may_context_mount_sb_relabel(sid, sbsec, tsec);
501 if (rc)
502 goto out_free;
503
504 sbsec->sid = sid;
505 }
506
507 /*
508 * Switch to using mount point labeling behavior.
509 * sets the label used on all file below the mountpoint, and will set
510 * the superblock context if not already set.
511 */
512 if (context) {
513 rc = security_context_to_sid(context, strlen(context), &sid);
514 if (rc) {
515 printk(KERN_WARNING "SELinux: security_context_to_sid"
516 "(%s) failed for (dev %s, type %s) errno=%d\n",
517 context, sb->s_id, name, rc);
518 goto out_free;
519 }
520
521 if (!fscontext) {
522 rc = may_context_mount_sb_relabel(sid, sbsec, tsec);
523 if (rc)
524 goto out_free;
525 sbsec->sid = sid;
526 } else {
527 rc = may_context_mount_inode_relabel(sid, sbsec, tsec);
528 if (rc)
529 goto out_free;
530 }
531 sbsec->mntpoint_sid = sid;
532
533 sbsec->behavior = SECURITY_FS_USE_MNTPOINT;
534 }
535
536 if (rootcontext) {
537 struct inode *inode = sb->s_root->d_inode;
538 struct inode_security_struct *isec = inode->i_security;
539 rc = security_context_to_sid(rootcontext, strlen(rootcontext), &sid);
540 if (rc) {
541 printk(KERN_WARNING "SELinux: security_context_to_sid"
542 "(%s) failed for (dev %s, type %s) errno=%d\n",
543 rootcontext, sb->s_id, name, rc);
544 goto out_free;
545 }
546
547 rc = may_context_mount_inode_relabel(sid, sbsec, tsec);
548 if (rc)
549 goto out_free;
550
551 isec->sid = sid;
552 isec->initialized = 1;
553 }
554
555 if (defcontext) {
556 rc = security_context_to_sid(defcontext, strlen(defcontext), &sid);
557 if (rc) {
558 printk(KERN_WARNING "SELinux: security_context_to_sid"
559 "(%s) failed for (dev %s, type %s) errno=%d\n",
560 defcontext, sb->s_id, name, rc);
561 goto out_free;
562 }
563
564 if (sid == sbsec->def_sid)
565 goto out_free;
566
567 rc = may_context_mount_inode_relabel(sid, sbsec, tsec);
568 if (rc)
569 goto out_free;
570
571 sbsec->def_sid = sid;
572 }
573
574 out_free:
575 if (alloc) {
576 kfree(context);
577 kfree(defcontext);
578 kfree(fscontext);
579 kfree(rootcontext);
580 }
581 out:
582 return rc;
583 }
584
585 static int superblock_doinit(struct super_block *sb, void *data)
586 {
587 struct superblock_security_struct *sbsec = sb->s_security;
588 struct dentry *root = sb->s_root;
589 struct inode *inode = root->d_inode;
590 int rc = 0;
591
592 down(&sbsec->sem);
593 if (sbsec->initialized)
594 goto out;
595
596 if (!ss_initialized) {
597 /* Defer initialization until selinux_complete_init,
598 after the initial policy is loaded and the security
599 server is ready to handle calls. */
600 spin_lock(&sb_security_lock);
601 if (list_empty(&sbsec->list))
602 list_add(&sbsec->list, &superblock_security_head);
603 spin_unlock(&sb_security_lock);
604 goto out;
605 }
606
607 /* Determine the labeling behavior to use for this filesystem type. */
608 rc = security_fs_use(sb->s_type->name, &sbsec->behavior, &sbsec->sid);
609 if (rc) {
610 printk(KERN_WARNING "%s: security_fs_use(%s) returned %d\n",
611 __FUNCTION__, sb->s_type->name, rc);
612 goto out;
613 }
614
615 rc = try_context_mount(sb, data);
616 if (rc)
617 goto out;
618
619 if (sbsec->behavior == SECURITY_FS_USE_XATTR) {
620 /* Make sure that the xattr handler exists and that no
621 error other than -ENODATA is returned by getxattr on
622 the root directory. -ENODATA is ok, as this may be
623 the first boot of the SELinux kernel before we have
624 assigned xattr values to the filesystem. */
625 if (!inode->i_op->getxattr) {
626 printk(KERN_WARNING "SELinux: (dev %s, type %s) has no "
627 "xattr support\n", sb->s_id, sb->s_type->name);
628 rc = -EOPNOTSUPP;
629 goto out;
630 }
631 rc = inode->i_op->getxattr(root, XATTR_NAME_SELINUX, NULL, 0);
632 if (rc < 0 && rc != -ENODATA) {
633 if (rc == -EOPNOTSUPP)
634 printk(KERN_WARNING "SELinux: (dev %s, type "
635 "%s) has no security xattr handler\n",
636 sb->s_id, sb->s_type->name);
637 else
638 printk(KERN_WARNING "SELinux: (dev %s, type "
639 "%s) getxattr errno %d\n", sb->s_id,
640 sb->s_type->name, -rc);
641 goto out;
642 }
643 }
644
645 if (strcmp(sb->s_type->name, "proc") == 0)
646 sbsec->proc = 1;
647
648 sbsec->initialized = 1;
649
650 if (sbsec->behavior > ARRAY_SIZE(labeling_behaviors)) {
651 printk(KERN_INFO "SELinux: initialized (dev %s, type %s), unknown behavior\n",
652 sb->s_id, sb->s_type->name);
653 }
654 else {
655 printk(KERN_INFO "SELinux: initialized (dev %s, type %s), %s\n",
656 sb->s_id, sb->s_type->name,
657 labeling_behaviors[sbsec->behavior-1]);
658 }
659
660 /* Initialize the root inode. */
661 rc = inode_doinit_with_dentry(sb->s_root->d_inode, sb->s_root);
662
663 /* Initialize any other inodes associated with the superblock, e.g.
664 inodes created prior to initial policy load or inodes created
665 during get_sb by a pseudo filesystem that directly
666 populates itself. */
667 spin_lock(&sbsec->isec_lock);
668 next_inode:
669 if (!list_empty(&sbsec->isec_head)) {
670 struct inode_security_struct *isec =
671 list_entry(sbsec->isec_head.next,
672 struct inode_security_struct, list);
673 struct inode *inode = isec->inode;
674 spin_unlock(&sbsec->isec_lock);
675 inode = igrab(inode);
676 if (inode) {
677 if (!IS_PRIVATE (inode))
678 inode_doinit(inode);
679 iput(inode);
680 }
681 spin_lock(&sbsec->isec_lock);
682 list_del_init(&isec->list);
683 goto next_inode;
684 }
685 spin_unlock(&sbsec->isec_lock);
686 out:
687 up(&sbsec->sem);
688 return rc;
689 }
690
691 static inline u16 inode_mode_to_security_class(umode_t mode)
692 {
693 switch (mode & S_IFMT) {
694 case S_IFSOCK:
695 return SECCLASS_SOCK_FILE;
696 case S_IFLNK:
697 return SECCLASS_LNK_FILE;
698 case S_IFREG:
699 return SECCLASS_FILE;
700 case S_IFBLK:
701 return SECCLASS_BLK_FILE;
702 case S_IFDIR:
703 return SECCLASS_DIR;
704 case S_IFCHR:
705 return SECCLASS_CHR_FILE;
706 case S_IFIFO:
707 return SECCLASS_FIFO_FILE;
708
709 }
710
711 return SECCLASS_FILE;
712 }
713
714 static inline int default_protocol_stream(int protocol)
715 {
716 return (protocol == IPPROTO_IP || protocol == IPPROTO_TCP);
717 }
718
719 static inline int default_protocol_dgram(int protocol)
720 {
721 return (protocol == IPPROTO_IP || protocol == IPPROTO_UDP);
722 }
723
724 static inline u16 socket_type_to_security_class(int family, int type, int protocol)
725 {
726 switch (family) {
727 case PF_UNIX:
728 switch (type) {
729 case SOCK_STREAM:
730 case SOCK_SEQPACKET:
731 return SECCLASS_UNIX_STREAM_SOCKET;
732 case SOCK_DGRAM:
733 return SECCLASS_UNIX_DGRAM_SOCKET;
734 }
735 break;
736 case PF_INET:
737 case PF_INET6:
738 switch (type) {
739 case SOCK_STREAM:
740 if (default_protocol_stream(protocol))
741 return SECCLASS_TCP_SOCKET;
742 else
743 return SECCLASS_RAWIP_SOCKET;
744 case SOCK_DGRAM:
745 if (default_protocol_dgram(protocol))
746 return SECCLASS_UDP_SOCKET;
747 else
748 return SECCLASS_RAWIP_SOCKET;
749 default:
750 return SECCLASS_RAWIP_SOCKET;
751 }
752 break;
753 case PF_NETLINK:
754 switch (protocol) {
755 case NETLINK_ROUTE:
756 return SECCLASS_NETLINK_ROUTE_SOCKET;
757 case NETLINK_FIREWALL:
758 return SECCLASS_NETLINK_FIREWALL_SOCKET;
759 case NETLINK_INET_DIAG:
760 return SECCLASS_NETLINK_TCPDIAG_SOCKET;
761 case NETLINK_NFLOG:
762 return SECCLASS_NETLINK_NFLOG_SOCKET;
763 case NETLINK_XFRM:
764 return SECCLASS_NETLINK_XFRM_SOCKET;
765 case NETLINK_SELINUX:
766 return SECCLASS_NETLINK_SELINUX_SOCKET;
767 case NETLINK_AUDIT:
768 return SECCLASS_NETLINK_AUDIT_SOCKET;
769 case NETLINK_IP6_FW:
770 return SECCLASS_NETLINK_IP6FW_SOCKET;
771 case NETLINK_DNRTMSG:
772 return SECCLASS_NETLINK_DNRT_SOCKET;
773 case NETLINK_KOBJECT_UEVENT:
774 return SECCLASS_NETLINK_KOBJECT_UEVENT_SOCKET;
775 default:
776 return SECCLASS_NETLINK_SOCKET;
777 }
778 case PF_PACKET:
779 return SECCLASS_PACKET_SOCKET;
780 case PF_KEY:
781 return SECCLASS_KEY_SOCKET;
782 case PF_APPLETALK:
783 return SECCLASS_APPLETALK_SOCKET;
784 }
785
786 return SECCLASS_SOCKET;
787 }
788
789 #ifdef CONFIG_PROC_FS
790 static int selinux_proc_get_sid(struct proc_dir_entry *de,
791 u16 tclass,
792 u32 *sid)
793 {
794 int buflen, rc;
795 char *buffer, *path, *end;
796
797 buffer = (char*)__get_free_page(GFP_KERNEL);
798 if (!buffer)
799 return -ENOMEM;
800
801 buflen = PAGE_SIZE;
802 end = buffer+buflen;
803 *--end = '\0';
804 buflen--;
805 path = end-1;
806 *path = '/';
807 while (de && de != de->parent) {
808 buflen -= de->namelen + 1;
809 if (buflen < 0)
810 break;
811 end -= de->namelen;
812 memcpy(end, de->name, de->namelen);
813 *--end = '/';
814 path = end;
815 de = de->parent;
816 }
817 rc = security_genfs_sid("proc", path, tclass, sid);
818 free_page((unsigned long)buffer);
819 return rc;
820 }
821 #else
822 static int selinux_proc_get_sid(struct proc_dir_entry *de,
823 u16 tclass,
824 u32 *sid)
825 {
826 return -EINVAL;
827 }
828 #endif
829
830 /* The inode's security attributes must be initialized before first use. */
831 static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry)
832 {
833 struct superblock_security_struct *sbsec = NULL;
834 struct inode_security_struct *isec = inode->i_security;
835 u32 sid;
836 struct dentry *dentry;
837 #define INITCONTEXTLEN 255
838 char *context = NULL;
839 unsigned len = 0;
840 int rc = 0;
841 int hold_sem = 0;
842
843 if (isec->initialized)
844 goto out;
845
846 down(&isec->sem);
847 hold_sem = 1;
848 if (isec->initialized)
849 goto out;
850
851 sbsec = inode->i_sb->s_security;
852 if (!sbsec->initialized) {
853 /* Defer initialization until selinux_complete_init,
854 after the initial policy is loaded and the security
855 server is ready to handle calls. */
856 spin_lock(&sbsec->isec_lock);
857 if (list_empty(&isec->list))
858 list_add(&isec->list, &sbsec->isec_head);
859 spin_unlock(&sbsec->isec_lock);
860 goto out;
861 }
862
863 switch (sbsec->behavior) {
864 case SECURITY_FS_USE_XATTR:
865 if (!inode->i_op->getxattr) {
866 isec->sid = sbsec->def_sid;
867 break;
868 }
869
870 /* Need a dentry, since the xattr API requires one.
871 Life would be simpler if we could just pass the inode. */
872 if (opt_dentry) {
873 /* Called from d_instantiate or d_splice_alias. */
874 dentry = dget(opt_dentry);
875 } else {
876 /* Called from selinux_complete_init, try to find a dentry. */
877 dentry = d_find_alias(inode);
878 }
879 if (!dentry) {
880 printk(KERN_WARNING "%s: no dentry for dev=%s "
881 "ino=%ld\n", __FUNCTION__, inode->i_sb->s_id,
882 inode->i_ino);
883 goto out;
884 }
885
886 len = INITCONTEXTLEN;
887 context = kmalloc(len, GFP_KERNEL);
888 if (!context) {
889 rc = -ENOMEM;
890 dput(dentry);
891 goto out;
892 }
893 rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX,
894 context, len);
895 if (rc == -ERANGE) {
896 /* Need a larger buffer. Query for the right size. */
897 rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX,
898 NULL, 0);
899 if (rc < 0) {
900 dput(dentry);
901 goto out;
902 }
903 kfree(context);
904 len = rc;
905 context = kmalloc(len, GFP_KERNEL);
906 if (!context) {
907 rc = -ENOMEM;
908 dput(dentry);
909 goto out;
910 }
911 rc = inode->i_op->getxattr(dentry,
912 XATTR_NAME_SELINUX,
913 context, len);
914 }
915 dput(dentry);
916 if (rc < 0) {
917 if (rc != -ENODATA) {
918 printk(KERN_WARNING "%s: getxattr returned "
919 "%d for dev=%s ino=%ld\n", __FUNCTION__,
920 -rc, inode->i_sb->s_id, inode->i_ino);
921 kfree(context);
922 goto out;
923 }
924 /* Map ENODATA to the default file SID */
925 sid = sbsec->def_sid;
926 rc = 0;
927 } else {
928 rc = security_context_to_sid_default(context, rc, &sid,
929 sbsec->def_sid);
930 if (rc) {
931 printk(KERN_WARNING "%s: context_to_sid(%s) "
932 "returned %d for dev=%s ino=%ld\n",
933 __FUNCTION__, context, -rc,
934 inode->i_sb->s_id, inode->i_ino);
935 kfree(context);
936 /* Leave with the unlabeled SID */
937 rc = 0;
938 break;
939 }
940 }
941 kfree(context);
942 isec->sid = sid;
943 break;
944 case SECURITY_FS_USE_TASK:
945 isec->sid = isec->task_sid;
946 break;
947 case SECURITY_FS_USE_TRANS:
948 /* Default to the fs SID. */
949 isec->sid = sbsec->sid;
950
951 /* Try to obtain a transition SID. */
952 isec->sclass = inode_mode_to_security_class(inode->i_mode);
953 rc = security_transition_sid(isec->task_sid,
954 sbsec->sid,
955 isec->sclass,
956 &sid);
957 if (rc)
958 goto out;
959 isec->sid = sid;
960 break;
961 case SECURITY_FS_USE_MNTPOINT:
962 isec->sid = sbsec->mntpoint_sid;
963 break;
964 default:
965 /* Default to the fs superblock SID. */
966 isec->sid = sbsec->sid;
967
968 if (sbsec->proc) {
969 struct proc_inode *proci = PROC_I(inode);
970 if (proci->pde) {
971 isec->sclass = inode_mode_to_security_class(inode->i_mode);
972 rc = selinux_proc_get_sid(proci->pde,
973 isec->sclass,
974 &sid);
975 if (rc)
976 goto out;
977 isec->sid = sid;
978 }
979 }
980 break;
981 }
982
983 isec->initialized = 1;
984
985 out:
986 if (isec->sclass == SECCLASS_FILE)
987 isec->sclass = inode_mode_to_security_class(inode->i_mode);
988
989 if (hold_sem)
990 up(&isec->sem);
991 return rc;
992 }
993
994 /* Convert a Linux signal to an access vector. */
995 static inline u32 signal_to_av(int sig)
996 {
997 u32 perm = 0;
998
999 switch (sig) {
1000 case SIGCHLD:
1001 /* Commonly granted from child to parent. */
1002 perm = PROCESS__SIGCHLD;
1003 break;
1004 case SIGKILL:
1005 /* Cannot be caught or ignored */
1006 perm = PROCESS__SIGKILL;
1007 break;
1008 case SIGSTOP:
1009 /* Cannot be caught or ignored */
1010 perm = PROCESS__SIGSTOP;
1011 break;
1012 default:
1013 /* All other signals. */
1014 perm = PROCESS__SIGNAL;
1015 break;
1016 }
1017
1018 return perm;
1019 }
1020
1021 /* Check permission betweeen a pair of tasks, e.g. signal checks,
1022 fork check, ptrace check, etc. */
1023 static int task_has_perm(struct task_struct *tsk1,
1024 struct task_struct *tsk2,
1025 u32 perms)
1026 {
1027 struct task_security_struct *tsec1, *tsec2;
1028
1029 tsec1 = tsk1->security;
1030 tsec2 = tsk2->security;
1031 return avc_has_perm(tsec1->sid, tsec2->sid,
1032 SECCLASS_PROCESS, perms, NULL);
1033 }
1034
1035 /* Check whether a task is allowed to use a capability. */
1036 static int task_has_capability(struct task_struct *tsk,
1037 int cap)
1038 {
1039 struct task_security_struct *tsec;
1040 struct avc_audit_data ad;
1041
1042 tsec = tsk->security;
1043
1044 AVC_AUDIT_DATA_INIT(&ad,CAP);
1045 ad.tsk = tsk;
1046 ad.u.cap = cap;
1047
1048 return avc_has_perm(tsec->sid, tsec->sid,
1049 SECCLASS_CAPABILITY, CAP_TO_MASK(cap), &ad);
1050 }
1051
1052 /* Check whether a task is allowed to use a system operation. */
1053 static int task_has_system(struct task_struct *tsk,
1054 u32 perms)
1055 {
1056 struct task_security_struct *tsec;
1057
1058 tsec = tsk->security;
1059
1060 return avc_has_perm(tsec->sid, SECINITSID_KERNEL,
1061 SECCLASS_SYSTEM, perms, NULL);
1062 }
1063
1064 /* Check whether a task has a particular permission to an inode.
1065 The 'adp' parameter is optional and allows other audit
1066 data to be passed (e.g. the dentry). */
1067 static int inode_has_perm(struct task_struct *tsk,
1068 struct inode *inode,
1069 u32 perms,
1070 struct avc_audit_data *adp)
1071 {
1072 struct task_security_struct *tsec;
1073 struct inode_security_struct *isec;
1074 struct avc_audit_data ad;
1075
1076 tsec = tsk->security;
1077 isec = inode->i_security;
1078
1079 if (!adp) {
1080 adp = &ad;
1081 AVC_AUDIT_DATA_INIT(&ad, FS);
1082 ad.u.fs.inode = inode;
1083 }
1084
1085 return avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, adp);
1086 }
1087
1088 /* Same as inode_has_perm, but pass explicit audit data containing
1089 the dentry to help the auditing code to more easily generate the
1090 pathname if needed. */
1091 static inline int dentry_has_perm(struct task_struct *tsk,
1092 struct vfsmount *mnt,
1093 struct dentry *dentry,
1094 u32 av)
1095 {
1096 struct inode *inode = dentry->d_inode;
1097 struct avc_audit_data ad;
1098 AVC_AUDIT_DATA_INIT(&ad,FS);
1099 ad.u.fs.mnt = mnt;
1100 ad.u.fs.dentry = dentry;
1101 return inode_has_perm(tsk, inode, av, &ad);
1102 }
1103
1104 /* Check whether a task can use an open file descriptor to
1105 access an inode in a given way. Check access to the
1106 descriptor itself, and then use dentry_has_perm to
1107 check a particular permission to the file.
1108 Access to the descriptor is implicitly granted if it
1109 has the same SID as the process. If av is zero, then
1110 access to the file is not checked, e.g. for cases
1111 where only the descriptor is affected like seek. */
1112 static int file_has_perm(struct task_struct *tsk,
1113 struct file *file,
1114 u32 av)
1115 {
1116 struct task_security_struct *tsec = tsk->security;
1117 struct file_security_struct *fsec = file->f_security;
1118 struct vfsmount *mnt = file->f_vfsmnt;
1119 struct dentry *dentry = file->f_dentry;
1120 struct inode *inode = dentry->d_inode;
1121 struct avc_audit_data ad;
1122 int rc;
1123
1124 AVC_AUDIT_DATA_INIT(&ad, FS);
1125 ad.u.fs.mnt = mnt;
1126 ad.u.fs.dentry = dentry;
1127
1128 if (tsec->sid != fsec->sid) {
1129 rc = avc_has_perm(tsec->sid, fsec->sid,
1130 SECCLASS_FD,
1131 FD__USE,
1132 &ad);
1133 if (rc)
1134 return rc;
1135 }
1136
1137 /* av is zero if only checking access to the descriptor. */
1138 if (av)
1139 return inode_has_perm(tsk, inode, av, &ad);
1140
1141 return 0;
1142 }
1143
1144 /* Check whether a task can create a file. */
1145 static int may_create(struct inode *dir,
1146 struct dentry *dentry,
1147 u16 tclass)
1148 {
1149 struct task_security_struct *tsec;
1150 struct inode_security_struct *dsec;
1151 struct superblock_security_struct *sbsec;
1152 u32 newsid;
1153 struct avc_audit_data ad;
1154 int rc;
1155
1156 tsec = current->security;
1157 dsec = dir->i_security;
1158 sbsec = dir->i_sb->s_security;
1159
1160 AVC_AUDIT_DATA_INIT(&ad, FS);
1161 ad.u.fs.dentry = dentry;
1162
1163 rc = avc_has_perm(tsec->sid, dsec->sid, SECCLASS_DIR,
1164 DIR__ADD_NAME | DIR__SEARCH,
1165 &ad);
1166 if (rc)
1167 return rc;
1168
1169 if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) {
1170 newsid = tsec->create_sid;
1171 } else {
1172 rc = security_transition_sid(tsec->sid, dsec->sid, tclass,
1173 &newsid);
1174 if (rc)
1175 return rc;
1176 }
1177
1178 rc = avc_has_perm(tsec->sid, newsid, tclass, FILE__CREATE, &ad);
1179 if (rc)
1180 return rc;
1181
1182 return avc_has_perm(newsid, sbsec->sid,
1183 SECCLASS_FILESYSTEM,
1184 FILESYSTEM__ASSOCIATE, &ad);
1185 }
1186
1187 /* Check whether a task can create a key. */
1188 static int may_create_key(u32 ksid,
1189 struct task_struct *ctx)
1190 {
1191 struct task_security_struct *tsec;
1192
1193 tsec = ctx->security;
1194
1195 return avc_has_perm(tsec->sid, ksid, SECCLASS_KEY, KEY__CREATE, NULL);
1196 }
1197
1198 #define MAY_LINK 0
1199 #define MAY_UNLINK 1
1200 #define MAY_RMDIR 2
1201
1202 /* Check whether a task can link, unlink, or rmdir a file/directory. */
1203 static int may_link(struct inode *dir,
1204 struct dentry *dentry,
1205 int kind)
1206
1207 {
1208 struct task_security_struct *tsec;
1209 struct inode_security_struct *dsec, *isec;
1210 struct avc_audit_data ad;
1211 u32 av;
1212 int rc;
1213
1214 tsec = current->security;
1215 dsec = dir->i_security;
1216 isec = dentry->d_inode->i_security;
1217
1218 AVC_AUDIT_DATA_INIT(&ad, FS);
1219 ad.u.fs.dentry = dentry;
1220
1221 av = DIR__SEARCH;
1222 av |= (kind ? DIR__REMOVE_NAME : DIR__ADD_NAME);
1223 rc = avc_has_perm(tsec->sid, dsec->sid, SECCLASS_DIR, av, &ad);
1224 if (rc)
1225 return rc;
1226
1227 switch (kind) {
1228 case MAY_LINK:
1229 av = FILE__LINK;
1230 break;
1231 case MAY_UNLINK:
1232 av = FILE__UNLINK;
1233 break;
1234 case MAY_RMDIR:
1235 av = DIR__RMDIR;
1236 break;
1237 default:
1238 printk(KERN_WARNING "may_link: unrecognized kind %d\n", kind);
1239 return 0;
1240 }
1241
1242 rc = avc_has_perm(tsec->sid, isec->sid, isec->sclass, av, &ad);
1243 return rc;
1244 }
1245
1246 static inline int may_rename(struct inode *old_dir,
1247 struct dentry *old_dentry,
1248 struct inode *new_dir,
1249 struct dentry *new_dentry)
1250 {
1251 struct task_security_struct *tsec;
1252 struct inode_security_struct *old_dsec, *new_dsec, *old_isec, *new_isec;
1253 struct avc_audit_data ad;
1254 u32 av;
1255 int old_is_dir, new_is_dir;
1256 int rc;
1257
1258 tsec = current->security;
1259 old_dsec = old_dir->i_security;
1260 old_isec = old_dentry->d_inode->i_security;
1261 old_is_dir = S_ISDIR(old_dentry->d_inode->i_mode);
1262 new_dsec = new_dir->i_security;
1263
1264 AVC_AUDIT_DATA_INIT(&ad, FS);
1265
1266 ad.u.fs.dentry = old_dentry;
1267 rc = avc_has_perm(tsec->sid, old_dsec->sid, SECCLASS_DIR,
1268 DIR__REMOVE_NAME | DIR__SEARCH, &ad);
1269 if (rc)
1270 return rc;
1271 rc = avc_has_perm(tsec->sid, old_isec->sid,
1272 old_isec->sclass, FILE__RENAME, &ad);
1273 if (rc)
1274 return rc;
1275 if (old_is_dir && new_dir != old_dir) {
1276 rc = avc_has_perm(tsec->sid, old_isec->sid,
1277 old_isec->sclass, DIR__REPARENT, &ad);
1278 if (rc)
1279 return rc;
1280 }
1281
1282 ad.u.fs.dentry = new_dentry;
1283 av = DIR__ADD_NAME | DIR__SEARCH;
1284 if (new_dentry->d_inode)
1285 av |= DIR__REMOVE_NAME;
1286 rc = avc_has_perm(tsec->sid, new_dsec->sid, SECCLASS_DIR, av, &ad);
1287 if (rc)
1288 return rc;
1289 if (new_dentry->d_inode) {
1290 new_isec = new_dentry->d_inode->i_security;
1291 new_is_dir = S_ISDIR(new_dentry->d_inode->i_mode);
1292 rc = avc_has_perm(tsec->sid, new_isec->sid,
1293 new_isec->sclass,
1294 (new_is_dir ? DIR__RMDIR : FILE__UNLINK), &ad);
1295 if (rc)
1296 return rc;
1297 }
1298
1299 return 0;
1300 }
1301
1302 /* Check whether a task can perform a filesystem operation. */
1303 static int superblock_has_perm(struct task_struct *tsk,
1304 struct super_block *sb,
1305 u32 perms,
1306 struct avc_audit_data *ad)
1307 {
1308 struct task_security_struct *tsec;
1309 struct superblock_security_struct *sbsec;
1310
1311 tsec = tsk->security;
1312 sbsec = sb->s_security;
1313 return avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM,
1314 perms, ad);
1315 }
1316
1317 /* Convert a Linux mode and permission mask to an access vector. */
1318 static inline u32 file_mask_to_av(int mode, int mask)
1319 {
1320 u32 av = 0;
1321
1322 if ((mode & S_IFMT) != S_IFDIR) {
1323 if (mask & MAY_EXEC)
1324 av |= FILE__EXECUTE;
1325 if (mask & MAY_READ)
1326 av |= FILE__READ;
1327
1328 if (mask & MAY_APPEND)
1329 av |= FILE__APPEND;
1330 else if (mask & MAY_WRITE)
1331 av |= FILE__WRITE;
1332
1333 } else {
1334 if (mask & MAY_EXEC)
1335 av |= DIR__SEARCH;
1336 if (mask & MAY_WRITE)
1337 av |= DIR__WRITE;
1338 if (mask & MAY_READ)
1339 av |= DIR__READ;
1340 }
1341
1342 return av;
1343 }
1344
1345 /* Convert a Linux file to an access vector. */
1346 static inline u32 file_to_av(struct file *file)
1347 {
1348 u32 av = 0;
1349
1350 if (file->f_mode & FMODE_READ)
1351 av |= FILE__READ;
1352 if (file->f_mode & FMODE_WRITE) {
1353 if (file->f_flags & O_APPEND)
1354 av |= FILE__APPEND;
1355 else
1356 av |= FILE__WRITE;
1357 }
1358
1359 return av;
1360 }
1361
1362 /* Set an inode's SID to a specified value. */
1363 static int inode_security_set_sid(struct inode *inode, u32 sid)
1364 {
1365 struct inode_security_struct *isec = inode->i_security;
1366 struct superblock_security_struct *sbsec = inode->i_sb->s_security;
1367
1368 if (!sbsec->initialized) {
1369 /* Defer initialization to selinux_complete_init. */
1370 return 0;
1371 }
1372
1373 down(&isec->sem);
1374 isec->sclass = inode_mode_to_security_class(inode->i_mode);
1375 isec->sid = sid;
1376 isec->initialized = 1;
1377 up(&isec->sem);
1378 return 0;
1379 }
1380
1381 /* Hook functions begin here. */
1382
1383 static int selinux_ptrace(struct task_struct *parent, struct task_struct *child)
1384 {
1385 struct task_security_struct *psec = parent->security;
1386 struct task_security_struct *csec = child->security;
1387 int rc;
1388
1389 rc = secondary_ops->ptrace(parent,child);
1390 if (rc)
1391 return rc;
1392
1393 rc = task_has_perm(parent, child, PROCESS__PTRACE);
1394 /* Save the SID of the tracing process for later use in apply_creds. */
1395 if (!(child->ptrace & PT_PTRACED) && !rc)
1396 csec->ptrace_sid = psec->sid;
1397 return rc;
1398 }
1399
1400 static int selinux_capget(struct task_struct *target, kernel_cap_t *effective,
1401 kernel_cap_t *inheritable, kernel_cap_t *permitted)
1402 {
1403 int error;
1404
1405 error = task_has_perm(current, target, PROCESS__GETCAP);
1406 if (error)
1407 return error;
1408
1409 return secondary_ops->capget(target, effective, inheritable, permitted);
1410 }
1411
1412 static int selinux_capset_check(struct task_struct *target, kernel_cap_t *effective,
1413 kernel_cap_t *inheritable, kernel_cap_t *permitted)
1414 {
1415 int error;
1416
1417 error = secondary_ops->capset_check(target, effective, inheritable, permitted);
1418 if (error)
1419 return error;
1420
1421 return task_has_perm(current, target, PROCESS__SETCAP);
1422 }
1423
1424 static void selinux_capset_set(struct task_struct *target, kernel_cap_t *effective,
1425 kernel_cap_t *inheritable, kernel_cap_t *permitted)
1426 {
1427 secondary_ops->capset_set(target, effective, inheritable, permitted);
1428 }
1429
1430 static int selinux_capable(struct task_struct *tsk, int cap)
1431 {
1432 int rc;
1433
1434 rc = secondary_ops->capable(tsk, cap);
1435 if (rc)
1436 return rc;
1437
1438 return task_has_capability(tsk,cap);
1439 }
1440
1441 static int selinux_sysctl(ctl_table *table, int op)
1442 {
1443 int error = 0;
1444 u32 av;
1445 struct task_security_struct *tsec;
1446 u32 tsid;
1447 int rc;
1448
1449 rc = secondary_ops->sysctl(table, op);
1450 if (rc)
1451 return rc;
1452
1453 tsec = current->security;
1454
1455 rc = selinux_proc_get_sid(table->de, (op == 001) ?
1456 SECCLASS_DIR : SECCLASS_FILE, &tsid);
1457 if (rc) {
1458 /* Default to the well-defined sysctl SID. */
1459 tsid = SECINITSID_SYSCTL;
1460 }
1461
1462 /* The op values are "defined" in sysctl.c, thereby creating
1463 * a bad coupling between this module and sysctl.c */
1464 if(op == 001) {
1465 error = avc_has_perm(tsec->sid, tsid,
1466 SECCLASS_DIR, DIR__SEARCH, NULL);
1467 } else {
1468 av = 0;
1469 if (op & 004)
1470 av |= FILE__READ;
1471 if (op & 002)
1472 av |= FILE__WRITE;
1473 if (av)
1474 error = avc_has_perm(tsec->sid, tsid,
1475 SECCLASS_FILE, av, NULL);
1476 }
1477
1478 return error;
1479 }
1480
1481 static int selinux_quotactl(int cmds, int type, int id, struct super_block *sb)
1482 {
1483 int rc = 0;
1484
1485 if (!sb)
1486 return 0;
1487
1488 switch (cmds) {
1489 case Q_SYNC:
1490 case Q_QUOTAON:
1491 case Q_QUOTAOFF:
1492 case Q_SETINFO:
1493 case Q_SETQUOTA:
1494 rc = superblock_has_perm(current,
1495 sb,
1496 FILESYSTEM__QUOTAMOD, NULL);
1497 break;
1498 case Q_GETFMT:
1499 case Q_GETINFO:
1500 case Q_GETQUOTA:
1501 rc = superblock_has_perm(current,
1502 sb,
1503 FILESYSTEM__QUOTAGET, NULL);
1504 break;
1505 default:
1506 rc = 0; /* let the kernel handle invalid cmds */
1507 break;
1508 }
1509 return rc;
1510 }
1511
1512 static int selinux_quota_on(struct dentry *dentry)
1513 {
1514 return dentry_has_perm(current, NULL, dentry, FILE__QUOTAON);
1515 }
1516
1517 static int selinux_syslog(int type)
1518 {
1519 int rc;
1520
1521 rc = secondary_ops->syslog(type);
1522 if (rc)
1523 return rc;
1524
1525 switch (type) {
1526 case 3: /* Read last kernel messages */
1527 case 10: /* Return size of the log buffer */
1528 rc = task_has_system(current, SYSTEM__SYSLOG_READ);
1529 break;
1530 case 6: /* Disable logging to console */
1531 case 7: /* Enable logging to console */
1532 case 8: /* Set level of messages printed to console */
1533 rc = task_has_system(current, SYSTEM__SYSLOG_CONSOLE);
1534 break;
1535 case 0: /* Close log */
1536 case 1: /* Open log */
1537 case 2: /* Read from log */
1538 case 4: /* Read/clear last kernel messages */
1539 case 5: /* Clear ring buffer */
1540 default:
1541 rc = task_has_system(current, SYSTEM__SYSLOG_MOD);
1542 break;
1543 }
1544 return rc;
1545 }
1546
1547 /*
1548 * Check that a process has enough memory to allocate a new virtual
1549 * mapping. 0 means there is enough memory for the allocation to
1550 * succeed and -ENOMEM implies there is not.
1551 *
1552 * Note that secondary_ops->capable and task_has_perm_noaudit return 0
1553 * if the capability is granted, but __vm_enough_memory requires 1 if
1554 * the capability is granted.
1555 *
1556 * Do not audit the selinux permission check, as this is applied to all
1557 * processes that allocate mappings.
1558 */
1559 static int selinux_vm_enough_memory(long pages)
1560 {
1561 int rc, cap_sys_admin = 0;
1562 struct task_security_struct *tsec = current->security;
1563
1564 rc = secondary_ops->capable(current, CAP_SYS_ADMIN);
1565 if (rc == 0)
1566 rc = avc_has_perm_noaudit(tsec->sid, tsec->sid,
1567 SECCLASS_CAPABILITY,
1568 CAP_TO_MASK(CAP_SYS_ADMIN),
1569 NULL);
1570
1571 if (rc == 0)
1572 cap_sys_admin = 1;
1573
1574 return __vm_enough_memory(pages, cap_sys_admin);
1575 }
1576
1577 /* binprm security operations */
1578
1579 static int selinux_bprm_alloc_security(struct linux_binprm *bprm)
1580 {
1581 struct bprm_security_struct *bsec;
1582
1583 bsec = kzalloc(sizeof(struct bprm_security_struct), GFP_KERNEL);
1584 if (!bsec)
1585 return -ENOMEM;
1586
1587 bsec->bprm = bprm;
1588 bsec->sid = SECINITSID_UNLABELED;
1589 bsec->set = 0;
1590
1591 bprm->security = bsec;
1592 return 0;
1593 }
1594
1595 static int selinux_bprm_set_security(struct linux_binprm *bprm)
1596 {
1597 struct task_security_struct *tsec;
1598 struct inode *inode = bprm->file->f_dentry->d_inode;
1599 struct inode_security_struct *isec;
1600 struct bprm_security_struct *bsec;
1601 u32 newsid;
1602 struct avc_audit_data ad;
1603 int rc;
1604
1605 rc = secondary_ops->bprm_set_security(bprm);
1606 if (rc)
1607 return rc;
1608
1609 bsec = bprm->security;
1610
1611 if (bsec->set)
1612 return 0;
1613
1614 tsec = current->security;
1615 isec = inode->i_security;
1616
1617 /* Default to the current task SID. */
1618 bsec->sid = tsec->sid;
1619
1620 /* Reset fs, key, and sock SIDs on execve. */
1621 tsec->create_sid = 0;
1622 tsec->keycreate_sid = 0;
1623 tsec->sockcreate_sid = 0;
1624
1625 if (tsec->exec_sid) {
1626 newsid = tsec->exec_sid;
1627 /* Reset exec SID on execve. */
1628 tsec->exec_sid = 0;
1629 } else {
1630 /* Check for a default transition on this program. */
1631 rc = security_transition_sid(tsec->sid, isec->sid,
1632 SECCLASS_PROCESS, &newsid);
1633 if (rc)
1634 return rc;
1635 }
1636
1637 AVC_AUDIT_DATA_INIT(&ad, FS);
1638 ad.u.fs.mnt = bprm->file->f_vfsmnt;
1639 ad.u.fs.dentry = bprm->file->f_dentry;
1640
1641 if (bprm->file->f_vfsmnt->mnt_flags & MNT_NOSUID)
1642 newsid = tsec->sid;
1643
1644 if (tsec->sid == newsid) {
1645 rc = avc_has_perm(tsec->sid, isec->sid,
1646 SECCLASS_FILE, FILE__EXECUTE_NO_TRANS, &ad);
1647 if (rc)
1648 return rc;
1649 } else {
1650 /* Check permissions for the transition. */
1651 rc = avc_has_perm(tsec->sid, newsid,
1652 SECCLASS_PROCESS, PROCESS__TRANSITION, &ad);
1653 if (rc)
1654 return rc;
1655
1656 rc = avc_has_perm(newsid, isec->sid,
1657 SECCLASS_FILE, FILE__ENTRYPOINT, &ad);
1658 if (rc)
1659 return rc;
1660
1661 /* Clear any possibly unsafe personality bits on exec: */
1662 current->personality &= ~PER_CLEAR_ON_SETID;
1663
1664 /* Set the security field to the new SID. */
1665 bsec->sid = newsid;
1666 }
1667
1668 bsec->set = 1;
1669 return 0;
1670 }
1671
1672 static int selinux_bprm_check_security (struct linux_binprm *bprm)
1673 {
1674 return secondary_ops->bprm_check_security(bprm);
1675 }
1676
1677
1678 static int selinux_bprm_secureexec (struct linux_binprm *bprm)
1679 {
1680 struct task_security_struct *tsec = current->security;
1681 int atsecure = 0;
1682
1683 if (tsec->osid != tsec->sid) {
1684 /* Enable secure mode for SIDs transitions unless
1685 the noatsecure permission is granted between
1686 the two SIDs, i.e. ahp returns 0. */
1687 atsecure = avc_has_perm(tsec->osid, tsec->sid,
1688 SECCLASS_PROCESS,
1689 PROCESS__NOATSECURE, NULL);
1690 }
1691
1692 return (atsecure || secondary_ops->bprm_secureexec(bprm));
1693 }
1694
1695 static void selinux_bprm_free_security(struct linux_binprm *bprm)
1696 {
1697 kfree(bprm->security);
1698 bprm->security = NULL;
1699 }
1700
1701 extern struct vfsmount *selinuxfs_mount;
1702 extern struct dentry *selinux_null;
1703
1704 /* Derived from fs/exec.c:flush_old_files. */
1705 static inline void flush_unauthorized_files(struct files_struct * files)
1706 {
1707 struct avc_audit_data ad;
1708 struct file *file, *devnull = NULL;
1709 struct tty_struct *tty = current->signal->tty;
1710 struct fdtable *fdt;
1711 long j = -1;
1712
1713 if (tty) {
1714 file_list_lock();
1715 file = list_entry(tty->tty_files.next, typeof(*file), f_u.fu_list);
1716 if (file) {
1717 /* Revalidate access to controlling tty.
1718 Use inode_has_perm on the tty inode directly rather
1719 than using file_has_perm, as this particular open
1720 file may belong to another process and we are only
1721 interested in the inode-based check here. */
1722 struct inode *inode = file->f_dentry->d_inode;
1723 if (inode_has_perm(current, inode,
1724 FILE__READ | FILE__WRITE, NULL)) {
1725 /* Reset controlling tty. */
1726 current->signal->tty = NULL;
1727 current->signal->tty_old_pgrp = 0;
1728 }
1729 }
1730 file_list_unlock();
1731 }
1732
1733 /* Revalidate access to inherited open files. */
1734
1735 AVC_AUDIT_DATA_INIT(&ad,FS);
1736
1737 spin_lock(&files->file_lock);
1738 for (;;) {
1739 unsigned long set, i;
1740 int fd;
1741
1742 j++;
1743 i = j * __NFDBITS;
1744 fdt = files_fdtable(files);
1745 if (i >= fdt->max_fds || i >= fdt->max_fdset)
1746 break;
1747 set = fdt->open_fds->fds_bits[j];
1748 if (!set)
1749 continue;
1750 spin_unlock(&files->file_lock);
1751 for ( ; set ; i++,set >>= 1) {
1752 if (set & 1) {
1753 file = fget(i);
1754 if (!file)
1755 continue;
1756 if (file_has_perm(current,
1757 file,
1758 file_to_av(file))) {
1759 sys_close(i);
1760 fd = get_unused_fd();
1761 if (fd != i) {
1762 if (fd >= 0)
1763 put_unused_fd(fd);
1764 fput(file);
1765 continue;
1766 }
1767 if (devnull) {
1768 get_file(devnull);
1769 } else {
1770 devnull = dentry_open(dget(selinux_null), mntget(selinuxfs_mount), O_RDWR);
1771 if (!devnull) {
1772 put_unused_fd(fd);
1773 fput(file);
1774 continue;
1775 }
1776 }
1777 fd_install(fd, devnull);
1778 }
1779 fput(file);
1780 }
1781 }
1782 spin_lock(&files->file_lock);
1783
1784 }
1785 spin_unlock(&files->file_lock);
1786 }
1787
1788 static void selinux_bprm_apply_creds(struct linux_binprm *bprm, int unsafe)
1789 {
1790 struct task_security_struct *tsec;
1791 struct bprm_security_struct *bsec;
1792 u32 sid;
1793 int rc;
1794
1795 secondary_ops->bprm_apply_creds(bprm, unsafe);
1796
1797 tsec = current->security;
1798
1799 bsec = bprm->security;
1800 sid = bsec->sid;
1801
1802 tsec->osid = tsec->sid;
1803 bsec->unsafe = 0;
1804 if (tsec->sid != sid) {
1805 /* Check for shared state. If not ok, leave SID
1806 unchanged and kill. */
1807 if (unsafe & LSM_UNSAFE_SHARE) {
1808 rc = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS,
1809 PROCESS__SHARE, NULL);
1810 if (rc) {
1811 bsec->unsafe = 1;
1812 return;
1813 }
1814 }
1815
1816 /* Check for ptracing, and update the task SID if ok.
1817 Otherwise, leave SID unchanged and kill. */
1818 if (unsafe & (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) {
1819 rc = avc_has_perm(tsec->ptrace_sid, sid,
1820 SECCLASS_PROCESS, PROCESS__PTRACE,
1821 NULL);
1822 if (rc) {
1823 bsec->unsafe = 1;
1824 return;
1825 }
1826 }
1827 tsec->sid = sid;
1828 }
1829 }
1830
1831 /*
1832 * called after apply_creds without the task lock held
1833 */
1834 static void selinux_bprm_post_apply_creds(struct linux_binprm *bprm)
1835 {
1836 struct task_security_struct *tsec;
1837 struct rlimit *rlim, *initrlim;
1838 struct itimerval itimer;
1839 struct bprm_security_struct *bsec;
1840 int rc, i;
1841
1842 tsec = current->security;
1843 bsec = bprm->security;
1844
1845 if (bsec->unsafe) {
1846 force_sig_specific(SIGKILL, current);
1847 return;
1848 }
1849 if (tsec->osid == tsec->sid)
1850 return;
1851
1852 /* Close files for which the new task SID is not authorized. */
1853 flush_unauthorized_files(current->files);
1854
1855 /* Check whether the new SID can inherit signal state
1856 from the old SID. If not, clear itimers to avoid
1857 subsequent signal generation and flush and unblock
1858 signals. This must occur _after_ the task SID has
1859 been updated so that any kill done after the flush
1860 will be checked against the new SID. */
1861 rc = avc_has_perm(tsec->osid, tsec->sid, SECCLASS_PROCESS,
1862 PROCESS__SIGINH, NULL);
1863 if (rc) {
1864 memset(&itimer, 0, sizeof itimer);
1865 for (i = 0; i < 3; i++)
1866 do_setitimer(i, &itimer, NULL);
1867 flush_signals(current);
1868 spin_lock_irq(&current->sighand->siglock);
1869 flush_signal_handlers(current, 1);
1870 sigemptyset(&current->blocked);
1871 recalc_sigpending();
1872 spin_unlock_irq(&current->sighand->siglock);
1873 }
1874
1875 /* Check whether the new SID can inherit resource limits
1876 from the old SID. If not, reset all soft limits to
1877 the lower of the current task's hard limit and the init
1878 task's soft limit. Note that the setting of hard limits
1879 (even to lower them) can be controlled by the setrlimit
1880 check. The inclusion of the init task's soft limit into
1881 the computation is to avoid resetting soft limits higher
1882 than the default soft limit for cases where the default
1883 is lower than the hard limit, e.g. RLIMIT_CORE or
1884 RLIMIT_STACK.*/
1885 rc = avc_has_perm(tsec->osid, tsec->sid, SECCLASS_PROCESS,
1886 PROCESS__RLIMITINH, NULL);
1887 if (rc) {
1888 for (i = 0; i < RLIM_NLIMITS; i++) {
1889 rlim = current->signal->rlim + i;
1890 initrlim = init_task.signal->rlim+i;
1891 rlim->rlim_cur = min(rlim->rlim_max,initrlim->rlim_cur);
1892 }
1893 if (current->signal->rlim[RLIMIT_CPU].rlim_cur != RLIM_INFINITY) {
1894 /*
1895 * This will cause RLIMIT_CPU calculations
1896 * to be refigured.
1897 */
1898 current->it_prof_expires = jiffies_to_cputime(1);
1899 }
1900 }
1901
1902 /* Wake up the parent if it is waiting so that it can
1903 recheck wait permission to the new task SID. */
1904 wake_up_interruptible(&current->parent->signal->wait_chldexit);
1905 }
1906
1907 /* superblock security operations */
1908
1909 static int selinux_sb_alloc_security(struct super_block *sb)
1910 {
1911 return superblock_alloc_security(sb);
1912 }
1913
1914 static void selinux_sb_free_security(struct super_block *sb)
1915 {
1916 superblock_free_security(sb);
1917 }
1918
1919 static inline int match_prefix(char *prefix, int plen, char *option, int olen)
1920 {
1921 if (plen > olen)
1922 return 0;
1923
1924 return !memcmp(prefix, option, plen);
1925 }
1926
1927 static inline int selinux_option(char *option, int len)
1928 {
1929 return (match_prefix("context=", sizeof("context=")-1, option, len) ||
1930 match_prefix("fscontext=", sizeof("fscontext=")-1, option, len) ||
1931 match_prefix("defcontext=", sizeof("defcontext=")-1, option, len) ||
1932 match_prefix("rootcontext=", sizeof("rootcontext=")-1, option, len));
1933 }
1934
1935 static inline void take_option(char **to, char *from, int *first, int len)
1936 {
1937 if (!*first) {
1938 **to = ',';
1939 *to += 1;
1940 }
1941 else
1942 *first = 0;
1943 memcpy(*to, from, len);
1944 *to += len;
1945 }
1946
1947 static int selinux_sb_copy_data(struct file_system_type *type, void *orig, void *copy)
1948 {
1949 int fnosec, fsec, rc = 0;
1950 char *in_save, *in_curr, *in_end;
1951 char *sec_curr, *nosec_save, *nosec;
1952
1953 in_curr = orig;
1954 sec_curr = copy;
1955
1956 /* Binary mount data: just copy */
1957 if (type->fs_flags & FS_BINARY_MOUNTDATA) {
1958 copy_page(sec_curr, in_curr);
1959 goto out;
1960 }
1961
1962 nosec = (char *)get_zeroed_page(GFP_KERNEL);
1963 if (!nosec) {
1964 rc = -ENOMEM;
1965 goto out;
1966 }
1967
1968 nosec_save = nosec;
1969 fnosec = fsec = 1;
1970 in_save = in_end = orig;
1971
1972 do {
1973 if (*in_end == ',' || *in_end == '\0') {
1974 int len = in_end - in_curr;
1975
1976 if (selinux_option(in_curr, len))
1977 take_option(&sec_curr, in_curr, &fsec, len);
1978 else
1979 take_option(&nosec, in_curr, &fnosec, len);
1980
1981 in_curr = in_end + 1;
1982 }
1983 } while (*in_end++);
1984
1985 strcpy(in_save, nosec_save);
1986 free_page((unsigned long)nosec_save);
1987 out:
1988 return rc;
1989 }
1990
1991 static int selinux_sb_kern_mount(struct super_block *sb, void *data)
1992 {
1993 struct avc_audit_data ad;
1994 int rc;
1995
1996 rc = superblock_doinit(sb, data);
1997 if (rc)
1998 return rc;
1999
2000 AVC_AUDIT_DATA_INIT(&ad,FS);
2001 ad.u.fs.dentry = sb->s_root;
2002 return superblock_has_perm(current, sb, FILESYSTEM__MOUNT, &ad);
2003 }
2004
2005 static int selinux_sb_statfs(struct dentry *dentry)
2006 {
2007 struct avc_audit_data ad;
2008
2009 AVC_AUDIT_DATA_INIT(&ad,FS);
2010 ad.u.fs.dentry = dentry->d_sb->s_root;
2011 return superblock_has_perm(current, dentry->d_sb, FILESYSTEM__GETATTR, &ad);
2012 }
2013
2014 static int selinux_mount(char * dev_name,
2015 struct nameidata *nd,
2016 char * type,
2017 unsigned long flags,
2018 void * data)
2019 {
2020 int rc;
2021
2022 rc = secondary_ops->sb_mount(dev_name, nd, type, flags, data);
2023 if (rc)
2024 return rc;
2025
2026 if (flags & MS_REMOUNT)
2027 return superblock_has_perm(current, nd->mnt->mnt_sb,
2028 FILESYSTEM__REMOUNT, NULL);
2029 else
2030 return dentry_has_perm(current, nd->mnt, nd->dentry,
2031 FILE__MOUNTON);
2032 }
2033
2034 static int selinux_umount(struct vfsmount *mnt, int flags)
2035 {
2036 int rc;
2037
2038 rc = secondary_ops->sb_umount(mnt, flags);
2039 if (rc)
2040 return rc;
2041
2042 return superblock_has_perm(current,mnt->mnt_sb,
2043 FILESYSTEM__UNMOUNT,NULL);
2044 }
2045
2046 /* inode security operations */
2047
2048 static int selinux_inode_alloc_security(struct inode *inode)
2049 {
2050 return inode_alloc_security(inode);
2051 }
2052
2053 static void selinux_inode_free_security(struct inode *inode)
2054 {
2055 inode_free_security(inode);
2056 }
2057
2058 static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
2059 char **name, void **value,
2060 size_t *len)
2061 {
2062 struct task_security_struct *tsec;
2063 struct inode_security_struct *dsec;
2064 struct superblock_security_struct *sbsec;
2065 u32 newsid, clen;
2066 int rc;
2067 char *namep = NULL, *context;
2068
2069 tsec = current->security;
2070 dsec = dir->i_security;
2071 sbsec = dir->i_sb->s_security;
2072
2073 if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) {
2074 newsid = tsec->create_sid;
2075 } else {
2076 rc = security_transition_sid(tsec->sid, dsec->sid,
2077 inode_mode_to_security_class(inode->i_mode),
2078 &newsid);
2079 if (rc) {
2080 printk(KERN_WARNING "%s: "
2081 "security_transition_sid failed, rc=%d (dev=%s "
2082 "ino=%ld)\n",
2083 __FUNCTION__,
2084 -rc, inode->i_sb->s_id, inode->i_ino);
2085 return rc;
2086 }
2087 }
2088
2089 inode_security_set_sid(inode, newsid);
2090
2091 if (!ss_initialized || sbsec->behavior == SECURITY_FS_USE_MNTPOINT)
2092 return -EOPNOTSUPP;
2093
2094 if (name) {
2095 namep = kstrdup(XATTR_SELINUX_SUFFIX, GFP_KERNEL);
2096 if (!namep)
2097 return -ENOMEM;
2098 *name = namep;
2099 }
2100
2101 if (value && len) {
2102 rc = security_sid_to_context(newsid, &context, &clen);
2103 if (rc) {
2104 kfree(namep);
2105 return rc;
2106 }
2107 *value = context;
2108 *len = clen;
2109 }
2110
2111 return 0;
2112 }
2113
2114 static int selinux_inode_create(struct inode *dir, struct dentry *dentry, int mask)
2115 {
2116 return may_create(dir, dentry, SECCLASS_FILE);
2117 }
2118
2119 static int selinux_inode_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry)
2120 {
2121 int rc;
2122
2123 rc = secondary_ops->inode_link(old_dentry,dir,new_dentry);
2124 if (rc)
2125 return rc;
2126 return may_link(dir, old_dentry, MAY_LINK);
2127 }
2128
2129 static int selinux_inode_unlink(struct inode *dir, struct dentry *dentry)
2130 {
2131 int rc;
2132
2133 rc = secondary_ops->inode_unlink(dir, dentry);
2134 if (rc)
2135 return rc;
2136 return may_link(dir, dentry, MAY_UNLINK);
2137 }
2138
2139 static int selinux_inode_symlink(struct inode *dir, struct dentry *dentry, const char *name)
2140 {
2141 return may_create(dir, dentry, SECCLASS_LNK_FILE);
2142 }
2143
2144 static int selinux_inode_mkdir(struct inode *dir, struct dentry *dentry, int mask)
2145 {
2146 return may_create(dir, dentry, SECCLASS_DIR);
2147 }
2148
2149 static int selinux_inode_rmdir(struct inode *dir, struct dentry *dentry)
2150 {
2151 return may_link(dir, dentry, MAY_RMDIR);
2152 }
2153
2154 static int selinux_inode_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
2155 {
2156 int rc;
2157
2158 rc = secondary_ops->inode_mknod(dir, dentry, mode, dev);
2159 if (rc)
2160 return rc;
2161
2162 return may_create(dir, dentry, inode_mode_to_security_class(mode));
2163 }
2164
2165 static int selinux_inode_rename(struct inode *old_inode, struct dentry *old_dentry,
2166 struct inode *new_inode, struct dentry *new_dentry)
2167 {
2168 return may_rename(old_inode, old_dentry, new_inode, new_dentry);
2169 }
2170
2171 static int selinux_inode_readlink(struct dentry *dentry)
2172 {
2173 return dentry_has_perm(current, NULL, dentry, FILE__READ);
2174 }
2175
2176 static int selinux_inode_follow_link(struct dentry *dentry, struct nameidata *nameidata)
2177 {
2178 int rc;
2179
2180 rc = secondary_ops->inode_follow_link(dentry,nameidata);
2181 if (rc)
2182 return rc;
2183 return dentry_has_perm(current, NULL, dentry, FILE__READ);
2184 }
2185
2186 static int selinux_inode_permission(struct inode *inode, int mask,
2187 struct nameidata *nd)
2188 {
2189 int rc;
2190
2191 rc = secondary_ops->inode_permission(inode, mask, nd);
2192 if (rc)
2193 return rc;
2194
2195 if (!mask) {
2196 /* No permission to check. Existence test. */
2197 return 0;
2198 }
2199
2200 return inode_has_perm(current, inode,
2201 file_mask_to_av(inode->i_mode, mask), NULL);
2202 }
2203
2204 static int selinux_inode_setattr(struct dentry *dentry, struct iattr *iattr)
2205 {
2206 int rc;
2207
2208 rc = secondary_ops->inode_setattr(dentry, iattr);
2209 if (rc)
2210 return rc;
2211
2212 if (iattr->ia_valid & ATTR_FORCE)
2213 return 0;
2214
2215 if (iattr->ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID |
2216 ATTR_ATIME_SET | ATTR_MTIME_SET))
2217 return dentry_has_perm(current, NULL, dentry, FILE__SETATTR);
2218
2219 return dentry_has_perm(current, NULL, dentry, FILE__WRITE);
2220 }
2221
2222 static int selinux_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
2223 {
2224 return dentry_has_perm(current, mnt, dentry, FILE__GETATTR);
2225 }
2226
2227 static int selinux_inode_setxattr(struct dentry *dentry, char *name, void *value, size_t size, int flags)
2228 {
2229 struct task_security_struct *tsec = current->security;
2230 struct inode *inode = dentry->d_inode;
2231 struct inode_security_struct *isec = inode->i_security;
2232 struct superblock_security_struct *sbsec;
2233 struct avc_audit_data ad;
2234 u32 newsid;
2235 int rc = 0;
2236
2237 if (strcmp(name, XATTR_NAME_SELINUX)) {
2238 if (!strncmp(name, XATTR_SECURITY_PREFIX,
2239 sizeof XATTR_SECURITY_PREFIX - 1) &&
2240 !capable(CAP_SYS_ADMIN)) {
2241 /* A different attribute in the security namespace.
2242 Restrict to administrator. */
2243 return -EPERM;
2244 }
2245
2246 /* Not an attribute we recognize, so just check the
2247 ordinary setattr permission. */
2248 return dentry_has_perm(current, NULL, dentry, FILE__SETATTR);
2249 }
2250
2251 sbsec = inode->i_sb->s_security;
2252 if (sbsec->behavior == SECURITY_FS_USE_MNTPOINT)
2253 return -EOPNOTSUPP;
2254
2255 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
2256 return -EPERM;
2257
2258 AVC_AUDIT_DATA_INIT(&ad,FS);
2259 ad.u.fs.dentry = dentry;
2260
2261 rc = avc_has_perm(tsec->sid, isec->sid, isec->sclass,
2262 FILE__RELABELFROM, &ad);
2263 if (rc)
2264 return rc;
2265
2266 rc = security_context_to_sid(value, size, &newsid);
2267 if (rc)
2268 return rc;
2269
2270 rc = avc_has_perm(tsec->sid, newsid, isec->sclass,
2271 FILE__RELABELTO, &ad);
2272 if (rc)
2273 return rc;
2274
2275 rc = security_validate_transition(isec->sid, newsid, tsec->sid,
2276 isec->sclass);
2277 if (rc)
2278 return rc;
2279
2280 return avc_has_perm(newsid,
2281 sbsec->sid,
2282 SECCLASS_FILESYSTEM,
2283 FILESYSTEM__ASSOCIATE,
2284 &ad);
2285 }
2286
2287 static void selinux_inode_post_setxattr(struct dentry *dentry, char *name,
2288 void *value, size_t size, int flags)
2289 {
2290 struct inode *inode = dentry->d_inode;
2291 struct inode_security_struct *isec = inode->i_security;
2292 u32 newsid;
2293 int rc;
2294
2295 if (strcmp(name, XATTR_NAME_SELINUX)) {
2296 /* Not an attribute we recognize, so nothing to do. */
2297 return;
2298 }
2299
2300 rc = security_context_to_sid(value, size, &newsid);
2301 if (rc) {
2302 printk(KERN_WARNING "%s: unable to obtain SID for context "
2303 "%s, rc=%d\n", __FUNCTION__, (char*)value, -rc);
2304 return;
2305 }
2306
2307 isec->sid = newsid;
2308 return;
2309 }
2310
2311 static int selinux_inode_getxattr (struct dentry *dentry, char *name)
2312 {
2313 return dentry_has_perm(current, NULL, dentry, FILE__GETATTR);
2314 }
2315
2316 static int selinux_inode_listxattr (struct dentry *dentry)
2317 {
2318 return dentry_has_perm(current, NULL, dentry, FILE__GETATTR);
2319 }
2320
2321 static int selinux_inode_removexattr (struct dentry *dentry, char *name)
2322 {
2323 if (strcmp(name, XATTR_NAME_SELINUX)) {
2324 if (!strncmp(name, XATTR_SECURITY_PREFIX,
2325 sizeof XATTR_SECURITY_PREFIX - 1) &&
2326 !capable(CAP_SYS_ADMIN)) {
2327 /* A different attribute in the security namespace.
2328 Restrict to administrator. */
2329 return -EPERM;
2330 }
2331
2332 /* Not an attribute we recognize, so just check the
2333 ordinary setattr permission. Might want a separate
2334 permission for removexattr. */
2335 return dentry_has_perm(current, NULL, dentry, FILE__SETATTR);
2336 }
2337
2338 /* No one is allowed to remove a SELinux security label.
2339 You can change the label, but all data must be labeled. */
2340 return -EACCES;
2341 }
2342
2343 static const char *selinux_inode_xattr_getsuffix(void)
2344 {
2345 return XATTR_SELINUX_SUFFIX;
2346 }
2347
2348 /*
2349 * Copy the in-core inode security context value to the user. If the
2350 * getxattr() prior to this succeeded, check to see if we need to
2351 * canonicalize the value to be finally returned to the user.
2352 *
2353 * Permission check is handled by selinux_inode_getxattr hook.
2354 */
2355 static int selinux_inode_getsecurity(const struct inode *inode, const char *name, void *buffer, size_t size, int err)
2356 {
2357 struct inode_security_struct *isec = inode->i_security;
2358
2359 if (strcmp(name, XATTR_SELINUX_SUFFIX))
2360 return -EOPNOTSUPP;
2361
2362 return selinux_getsecurity(isec->sid, buffer, size);
2363 }
2364
2365 static int selinux_inode_setsecurity(struct inode *inode, const char *name,
2366 const void *value, size_t size, int flags)
2367 {
2368 struct inode_security_struct *isec = inode->i_security;
2369 u32 newsid;
2370 int rc;
2371
2372 if (strcmp(name, XATTR_SELINUX_SUFFIX))
2373 return -EOPNOTSUPP;
2374
2375 if (!value || !size)
2376 return -EACCES;
2377
2378 rc = security_context_to_sid((void*)value, size, &newsid);
2379 if (rc)
2380 return rc;
2381
2382 isec->sid = newsid;
2383 return 0;
2384 }
2385
2386 static int selinux_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
2387 {
2388 const int len = sizeof(XATTR_NAME_SELINUX);
2389 if (buffer && len <= buffer_size)
2390 memcpy(buffer, XATTR_NAME_SELINUX, len);
2391 return len;
2392 }
2393
2394 /* file security operations */
2395
2396 static int selinux_file_permission(struct file *file, int mask)
2397 {
2398 struct inode *inode = file->f_dentry->d_inode;
2399
2400 if (!mask) {
2401 /* No permission to check. Existence test. */
2402 return 0;
2403 }
2404
2405 /* file_mask_to_av won't add FILE__WRITE if MAY_APPEND is set */
2406 if ((file->f_flags & O_APPEND) && (mask & MAY_WRITE))
2407 mask |= MAY_APPEND;
2408
2409 return file_has_perm(current, file,
2410 file_mask_to_av(inode->i_mode, mask));
2411 }
2412
2413 static int selinux_file_alloc_security(struct file *file)
2414 {
2415 return file_alloc_security(file);
2416 }
2417
2418 static void selinux_file_free_security(struct file *file)
2419 {
2420 file_free_security(file);
2421 }
2422
2423 static int selinux_file_ioctl(struct file *file, unsigned int cmd,
2424 unsigned long arg)
2425 {
2426 int error = 0;
2427
2428 switch (cmd) {
2429 case FIONREAD:
2430 /* fall through */
2431 case FIBMAP:
2432 /* fall through */
2433 case FIGETBSZ:
2434 /* fall through */
2435 case EXT2_IOC_GETFLAGS:
2436 /* fall through */
2437 case EXT2_IOC_GETVERSION:
2438 error = file_has_perm(current, file, FILE__GETATTR);
2439 break;
2440
2441 case EXT2_IOC_SETFLAGS:
2442 /* fall through */
2443 case EXT2_IOC_SETVERSION:
2444 error = file_has_perm(current, file, FILE__SETATTR);
2445 break;
2446
2447 /* sys_ioctl() checks */
2448 case FIONBIO:
2449 /* fall through */
2450 case FIOASYNC:
2451 error = file_has_perm(current, file, 0);
2452 break;
2453
2454 case KDSKBENT:
2455 case KDSKBSENT:
2456 error = task_has_capability(current,CAP_SYS_TTY_CONFIG);
2457 break;
2458
2459 /* default case assumes that the command will go
2460 * to the file's ioctl() function.
2461 */
2462 default:
2463 error = file_has_perm(current, file, FILE__IOCTL);
2464
2465 }
2466 return error;
2467 }
2468
2469 static int file_map_prot_check(struct file *file, unsigned long prot, int shared)
2470 {
2471 #ifndef CONFIG_PPC32
2472 if ((prot & PROT_EXEC) && (!file || (!shared && (prot & PROT_WRITE)))) {
2473 /*
2474 * We are making executable an anonymous mapping or a
2475 * private file mapping that will also be writable.
2476 * This has an additional check.
2477 */
2478 int rc = task_has_perm(current, current, PROCESS__EXECMEM);
2479 if (rc)
2480 return rc;
2481 }
2482 #endif
2483
2484 if (file) {
2485 /* read access is always possible with a mapping */
2486 u32 av = FILE__READ;
2487
2488 /* write access only matters if the mapping is shared */
2489 if (shared && (prot & PROT_WRITE))
2490 av |= FILE__WRITE;
2491
2492 if (prot & PROT_EXEC)
2493 av |= FILE__EXECUTE;
2494
2495 return file_has_perm(current, file, av);
2496 }
2497 return 0;
2498 }
2499
2500 static int selinux_file_mmap(struct file *file, unsigned long reqprot,
2501 unsigned long prot, unsigned long flags)
2502 {
2503 int rc;
2504
2505 rc = secondary_ops->file_mmap(file, reqprot, prot, flags);
2506 if (rc)
2507 return rc;
2508
2509 if (selinux_checkreqprot)
2510 prot = reqprot;
2511
2512 return file_map_prot_check(file, prot,
2513 (flags & MAP_TYPE) == MAP_SHARED);
2514 }
2515
2516 static int selinux_file_mprotect(struct vm_area_struct *vma,
2517 unsigned long reqprot,
2518 unsigned long prot)
2519 {
2520 int rc;
2521
2522 rc = secondary_ops->file_mprotect(vma, reqprot, prot);
2523 if (rc)
2524 return rc;
2525
2526 if (selinux_checkreqprot)
2527 prot = reqprot;
2528
2529 #ifndef CONFIG_PPC32
2530 if ((prot & PROT_EXEC) && !(vma->vm_flags & VM_EXEC)) {
2531 rc = 0;
2532 if (vma->vm_start >= vma->vm_mm->start_brk &&
2533 vma->vm_end <= vma->vm_mm->brk) {
2534 rc = task_has_perm(current, current,
2535 PROCESS__EXECHEAP);
2536 } else if (!vma->vm_file &&
2537 vma->vm_start <= vma->vm_mm->start_stack &&
2538 vma->vm_end >= vma->vm_mm->start_stack) {
2539 rc = task_has_perm(current, current, PROCESS__EXECSTACK);
2540 } else if (vma->vm_file && vma->anon_vma) {
2541 /*
2542 * We are making executable a file mapping that has
2543 * had some COW done. Since pages might have been
2544 * written, check ability to execute the possibly
2545 * modified content. This typically should only
2546 * occur for text relocations.
2547 */
2548 rc = file_has_perm(current, vma->vm_file,
2549 FILE__EXECMOD);
2550 }
2551 if (rc)
2552 return rc;
2553 }
2554 #endif
2555
2556 return file_map_prot_check(vma->vm_file, prot, vma->vm_flags&VM_SHARED);
2557 }
2558
2559 static int selinux_file_lock(struct file *file, unsigned int cmd)
2560 {
2561 return file_has_perm(current, file, FILE__LOCK);
2562 }
2563
2564 static int selinux_file_fcntl(struct file *file, unsigned int cmd,
2565 unsigned long arg)
2566 {
2567 int err = 0;
2568
2569 switch (cmd) {
2570 case F_SETFL:
2571 if (!file->f_dentry || !file->f_dentry->d_inode) {
2572 err = -EINVAL;
2573 break;
2574 }
2575
2576 if ((file->f_flags & O_APPEND) && !(arg & O_APPEND)) {
2577 err = file_has_perm(current, file,FILE__WRITE);
2578 break;
2579 }
2580 /* fall through */
2581 case F_SETOWN:
2582 case F_SETSIG:
2583 case F_GETFL:
2584 case F_GETOWN:
2585 case F_GETSIG:
2586 /* Just check FD__USE permission */
2587 err = file_has_perm(current, file, 0);
2588 break;
2589 case F_GETLK:
2590 case F_SETLK:
2591 case F_SETLKW:
2592 #if BITS_PER_LONG == 32
2593 case F_GETLK64:
2594 case F_SETLK64:
2595 case F_SETLKW64:
2596 #endif
2597 if (!file->f_dentry || !file->f_dentry->d_inode) {
2598 err = -EINVAL;
2599 break;
2600 }
2601 err = file_has_perm(current, file, FILE__LOCK);
2602 break;
2603 }
2604
2605 return err;
2606 }
2607
2608 static int selinux_file_set_fowner(struct file *file)
2609 {
2610 struct task_security_struct *tsec;
2611 struct file_security_struct *fsec;
2612
2613 tsec = current->security;
2614 fsec = file->f_security;
2615 fsec->fown_sid = tsec->sid;
2616
2617 return 0;
2618 }
2619
2620 static int selinux_file_send_sigiotask(struct task_struct *tsk,
2621 struct fown_struct *fown, int signum)
2622 {
2623 struct file *file;
2624 u32 perm;
2625 struct task_security_struct *tsec;
2626 struct file_security_struct *fsec;
2627
2628 /* struct fown_struct is never outside the context of a struct file */
2629 file = (struct file *)((long)fown - offsetof(struct file,f_owner));
2630
2631 tsec = tsk->security;
2632 fsec = file->f_security;
2633
2634 if (!signum)
2635 perm = signal_to_av(SIGIO); /* as per send_sigio_to_task */
2636 else
2637 perm = signal_to_av(signum);
2638
2639 return avc_has_perm(fsec->fown_sid, tsec->sid,
2640 SECCLASS_PROCESS, perm, NULL);
2641 }
2642
2643 static int selinux_file_receive(struct file *file)
2644 {
2645 return file_has_perm(current, file, file_to_av(file));
2646 }
2647
2648 /* task security operations */
2649
2650 static int selinux_task_create(unsigned long clone_flags)
2651 {
2652 int rc;
2653
2654 rc = secondary_ops->task_create(clone_flags);
2655 if (rc)
2656 return rc;
2657
2658 return task_has_perm(current, current, PROCESS__FORK);
2659 }
2660
2661 static int selinux_task_alloc_security(struct task_struct *tsk)
2662 {
2663 struct task_security_struct *tsec1, *tsec2;
2664 int rc;
2665
2666 tsec1 = current->security;
2667
2668 rc = task_alloc_security(tsk);
2669 if (rc)
2670 return rc;
2671 tsec2 = tsk->security;
2672
2673 tsec2->osid = tsec1->osid;
2674 tsec2->sid = tsec1->sid;
2675
2676 /* Retain the exec, fs, key, and sock SIDs across fork */
2677 tsec2->exec_sid = tsec1->exec_sid;
2678 tsec2->create_sid = tsec1->create_sid;
2679 tsec2->keycreate_sid = tsec1->keycreate_sid;
2680 tsec2->sockcreate_sid = tsec1->sockcreate_sid;
2681
2682 /* Retain ptracer SID across fork, if any.
2683 This will be reset by the ptrace hook upon any
2684 subsequent ptrace_attach operations. */
2685 tsec2->ptrace_sid = tsec1->ptrace_sid;
2686
2687 return 0;
2688 }
2689
2690 static void selinux_task_free_security(struct task_struct *tsk)
2691 {
2692 task_free_security(tsk);
2693 }
2694
2695 static int selinux_task_setuid(uid_t id0, uid_t id1, uid_t id2, int flags)
2696 {
2697 /* Since setuid only affects the current process, and
2698 since the SELinux controls are not based on the Linux
2699 identity attributes, SELinux does not need to control
2700 this operation. However, SELinux does control the use
2701 of the CAP_SETUID and CAP_SETGID capabilities using the
2702 capable hook. */
2703 return 0;
2704 }
2705
2706 static int selinux_task_post_setuid(uid_t id0, uid_t id1, uid_t id2, int flags)
2707 {
2708 return secondary_ops->task_post_setuid(id0,id1,id2,flags);
2709 }
2710
2711 static int selinux_task_setgid(gid_t id0, gid_t id1, gid_t id2, int flags)
2712 {
2713 /* See the comment for setuid above. */
2714 return 0;
2715 }
2716
2717 static int selinux_task_setpgid(struct task_struct *p, pid_t pgid)
2718 {
2719 return task_has_perm(current, p, PROCESS__SETPGID);
2720 }
2721
2722 static int selinux_task_getpgid(struct task_struct *p)
2723 {
2724 return task_has_perm(current, p, PROCESS__GETPGID);
2725 }
2726
2727 static int selinux_task_getsid(struct task_struct *p)
2728 {
2729 return task_has_perm(current, p, PROCESS__GETSESSION);
2730 }
2731
2732 static void selinux_task_getsecid(struct task_struct *p, u32 *secid)
2733 {
2734 selinux_get_task_sid(p, secid);
2735 }
2736
2737 static int selinux_task_setgroups(struct group_info *group_info)
2738 {
2739 /* See the comment for setuid above. */
2740 return 0;
2741 }
2742
2743 static int selinux_task_setnice(struct task_struct *p, int nice)
2744 {
2745 int rc;
2746
2747 rc = secondary_ops->task_setnice(p, nice);
2748 if (rc)
2749 return rc;
2750
2751 return task_has_perm(current,p, PROCESS__SETSCHED);
2752 }
2753
2754 static int selinux_task_setioprio(struct task_struct *p, int ioprio)
2755 {
2756 return task_has_perm(current, p, PROCESS__SETSCHED);
2757 }
2758
2759 static int selinux_task_getioprio(struct task_struct *p)
2760 {
2761 return task_has_perm(current, p, PROCESS__GETSCHED);
2762 }
2763
2764 static int selinux_task_setrlimit(unsigned int resource, struct rlimit *new_rlim)
2765 {
2766 struct rlimit *old_rlim = current->signal->rlim + resource;
2767 int rc;
2768
2769 rc = secondary_ops->task_setrlimit(resource, new_rlim);
2770 if (rc)
2771 return rc;
2772
2773 /* Control the ability to change the hard limit (whether
2774 lowering or raising it), so that the hard limit can
2775 later be used as a safe reset point for the soft limit
2776 upon context transitions. See selinux_bprm_apply_creds. */
2777 if (old_rlim->rlim_max != new_rlim->rlim_max)
2778 return task_has_perm(current, current, PROCESS__SETRLIMIT);
2779
2780 return 0;
2781 }
2782
2783 static int selinux_task_setscheduler(struct task_struct *p, int policy, struct sched_param *lp)
2784 {
2785 return task_has_perm(current, p, PROCESS__SETSCHED);
2786 }
2787
2788 static int selinux_task_getscheduler(struct task_struct *p)
2789 {
2790 return task_has_perm(current, p, PROCESS__GETSCHED);
2791 }
2792
2793 static int selinux_task_movememory(struct task_struct *p)
2794 {
2795 return task_has_perm(current, p, PROCESS__SETSCHED);
2796 }
2797
2798 static int selinux_task_kill(struct task_struct *p, struct siginfo *info,
2799 int sig, u32 secid)
2800 {
2801 u32 perm;
2802 int rc;
2803 struct task_security_struct *tsec;
2804
2805 rc = secondary_ops->task_kill(p, info, sig, secid);
2806 if (rc)
2807 return rc;
2808
2809 if (info != SEND_SIG_NOINFO && (is_si_special(info) || SI_FROMKERNEL(info)))
2810 return 0;
2811
2812 if (!sig)
2813 perm = PROCESS__SIGNULL; /* null signal; existence test */
2814 else
2815 perm = signal_to_av(sig);
2816 tsec = p->security;
2817 if (secid)
2818 rc = avc_has_perm(secid, tsec->sid, SECCLASS_PROCESS, perm, NULL);
2819 else
2820 rc = task_has_perm(current, p, perm);
2821 return rc;
2822 }
2823
2824 static int selinux_task_prctl(int option,
2825 unsigned long arg2,
2826 unsigned long arg3,
2827 unsigned long arg4,
2828 unsigned long arg5)
2829 {
2830 /* The current prctl operations do not appear to require
2831 any SELinux controls since they merely observe or modify
2832 the state of the current process. */
2833 return 0;
2834 }
2835
2836 static int selinux_task_wait(struct task_struct *p)
2837 {
2838 u32 perm;
2839
2840 perm = signal_to_av(p->exit_signal);
2841
2842 return task_has_perm(p, current, perm);
2843 }
2844
2845 static void selinux_task_reparent_to_init(struct task_struct *p)
2846 {
2847 struct task_security_struct *tsec;
2848
2849 secondary_ops->task_reparent_to_init(p);
2850
2851 tsec = p->security;
2852 tsec->osid = tsec->sid;
2853 tsec->sid = SECINITSID_KERNEL;
2854 return;
2855 }
2856
2857 static void selinux_task_to_inode(struct task_struct *p,
2858 struct inode *inode)
2859 {
2860 struct task_security_struct *tsec = p->security;
2861 struct inode_security_struct *isec = inode->i_security;
2862
2863 isec->sid = tsec->sid;
2864 isec->initialized = 1;
2865 return;
2866 }
2867
2868 /* Returns error only if unable to parse addresses */
2869 static int selinux_parse_skb_ipv4(struct sk_buff *skb, struct avc_audit_data *ad)
2870 {
2871 int offset, ihlen, ret = -EINVAL;
2872 struct iphdr _iph, *ih;
2873
2874 offset = skb->nh.raw - skb->data;
2875 ih = skb_header_pointer(skb, offset, sizeof(_iph), &_iph);
2876 if (ih == NULL)
2877 goto out;
2878
2879 ihlen = ih->ihl * 4;
2880 if (ihlen < sizeof(_iph))
2881 goto out;
2882
2883 ad->u.net.v4info.saddr = ih->saddr;
2884 ad->u.net.v4info.daddr = ih->daddr;
2885 ret = 0;
2886
2887 switch (ih->protocol) {
2888 case IPPROTO_TCP: {
2889 struct tcphdr _tcph, *th;
2890
2891 if (ntohs(ih->frag_off) & IP_OFFSET)
2892 break;
2893
2894 offset += ihlen;
2895 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
2896 if (th == NULL)
2897 break;
2898
2899 ad->u.net.sport = th->source;
2900 ad->u.net.dport = th->dest;
2901 break;
2902 }
2903
2904 case IPPROTO_UDP: {
2905 struct udphdr _udph, *uh;
2906
2907 if (ntohs(ih->frag_off) & IP_OFFSET)
2908 break;
2909
2910 offset += ihlen;
2911 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
2912 if (uh == NULL)
2913 break;
2914
2915 ad->u.net.sport = uh->source;
2916 ad->u.net.dport = uh->dest;
2917 break;
2918 }
2919
2920 default:
2921 break;
2922 }
2923 out:
2924 return ret;
2925 }
2926
2927 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2928
2929 /* Returns error only if unable to parse addresses */
2930 static int selinux_parse_skb_ipv6(struct sk_buff *skb, struct avc_audit_data *ad)
2931 {
2932 u8 nexthdr;
2933 int ret = -EINVAL, offset;
2934 struct ipv6hdr _ipv6h, *ip6;
2935
2936 offset = skb->nh.raw - skb->data;
2937 ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h);
2938 if (ip6 == NULL)
2939 goto out;
2940
2941 ipv6_addr_copy(&ad->u.net.v6info.saddr, &ip6->saddr);
2942 ipv6_addr_copy(&ad->u.net.v6info.daddr, &ip6->daddr);
2943 ret = 0;
2944
2945 nexthdr = ip6->nexthdr;
2946 offset += sizeof(_ipv6h);
2947 offset = ipv6_skip_exthdr(skb, offset, &nexthdr);
2948 if (offset < 0)
2949 goto out;
2950
2951 switch (nexthdr) {
2952 case IPPROTO_TCP: {
2953 struct tcphdr _tcph, *th;
2954
2955 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
2956 if (th == NULL)
2957 break;
2958
2959 ad->u.net.sport = th->source;
2960 ad->u.net.dport = th->dest;
2961 break;
2962 }
2963
2964 case IPPROTO_UDP: {
2965 struct udphdr _udph, *uh;
2966
2967 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
2968 if (uh == NULL)
2969 break;
2970
2971 ad->u.net.sport = uh->source;
2972 ad->u.net.dport = uh->dest;
2973 break;
2974 }
2975
2976 /* includes fragments */
2977 default:
2978 break;
2979 }
2980 out:
2981 return ret;
2982 }
2983
2984 #endif /* IPV6 */
2985
2986 static int selinux_parse_skb(struct sk_buff *skb, struct avc_audit_data *ad,
2987 char **addrp, int *len, int src)
2988 {
2989 int ret = 0;
2990
2991 switch (ad->u.net.family) {
2992 case PF_INET:
2993 ret = selinux_parse_skb_ipv4(skb, ad);
2994 if (ret || !addrp)
2995 break;
2996 *len = 4;
2997 *addrp = (char *)(src ? &ad->u.net.v4info.saddr :
2998 &ad->u.net.v4info.daddr);
2999 break;
3000
3001 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3002 case PF_INET6:
3003 ret = selinux_parse_skb_ipv6(skb, ad);
3004 if (ret || !addrp)
3005 break;
3006 *len = 16;
3007 *addrp = (char *)(src ? &ad->u.net.v6info.saddr :
3008 &ad->u.net.v6info.daddr);
3009 break;
3010 #endif /* IPV6 */
3011 default:
3012 break;
3013 }
3014
3015 return ret;
3016 }
3017
3018 /* socket security operations */
3019 static int socket_has_perm(struct task_struct *task, struct socket *sock,
3020 u32 perms)
3021 {
3022 struct inode_security_struct *isec;
3023 struct task_security_struct *tsec;
3024 struct avc_audit_data ad;
3025 int err = 0;
3026
3027 tsec = task->security;
3028 isec = SOCK_INODE(sock)->i_security;
3029
3030 if (isec->sid == SECINITSID_KERNEL)
3031 goto out;
3032
3033 AVC_AUDIT_DATA_INIT(&ad,NET);
3034 ad.u.net.sk = sock->sk;
3035 err = avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, &ad);
3036
3037 out:
3038 return err;
3039 }
3040
3041 static int selinux_socket_create(int family, int type,
3042 int protocol, int kern)
3043 {
3044 int err = 0;
3045 struct task_security_struct *tsec;
3046 u32 newsid;
3047
3048 if (kern)
3049 goto out;
3050
3051 tsec = current->security;
3052 newsid = tsec->sockcreate_sid ? : tsec->sid;
3053 err = avc_has_perm(tsec->sid, newsid,
3054 socket_type_to_security_class(family, type,
3055 protocol), SOCKET__CREATE, NULL);
3056
3057 out:
3058 return err;
3059 }
3060
3061 static void selinux_socket_post_create(struct socket *sock, int family,
3062 int type, int protocol, int kern)
3063 {
3064 struct inode_security_struct *isec;
3065 struct task_security_struct *tsec;
3066 struct sk_security_struct *sksec;
3067 u32 newsid;
3068
3069 isec = SOCK_INODE(sock)->i_security;
3070
3071 tsec = current->security;
3072 newsid = tsec->sockcreate_sid ? : tsec->sid;
3073 isec->sclass = socket_type_to_security_class(family, type, protocol);
3074 isec->sid = kern ? SECINITSID_KERNEL : newsid;
3075 isec->initialized = 1;
3076
3077 if (sock->sk) {
3078 sksec = sock->sk->sk_security;
3079 sksec->sid = isec->sid;
3080 }
3081
3082 return;
3083 }
3084
3085 /* Range of port numbers used to automatically bind.
3086 Need to determine whether we should perform a name_bind
3087 permission check between the socket and the port number. */
3088 #define ip_local_port_range_0 sysctl_local_port_range[0]
3089 #define ip_local_port_range_1 sysctl_local_port_range[1]
3090
3091 static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, int addrlen)
3092 {
3093 u16 family;
3094 int err;
3095
3096 err = socket_has_perm(current, sock, SOCKET__BIND);
3097 if (err)
3098 goto out;
3099
3100 /*
3101 * If PF_INET or PF_INET6, check name_bind permission for the port.
3102 * Multiple address binding for SCTP is not supported yet: we just
3103 * check the first address now.
3104 */
3105 family = sock->sk->sk_family;
3106 if (family == PF_INET || family == PF_INET6) {
3107 char *addrp;
3108 struct inode_security_struct *isec;
3109 struct task_security_struct *tsec;
3110 struct avc_audit_data ad;
3111 struct sockaddr_in *addr4 = NULL;
3112 struct sockaddr_in6 *addr6 = NULL;
3113 unsigned short snum;
3114 struct sock *sk = sock->sk;
3115 u32 sid, node_perm, addrlen;
3116
3117 tsec = current->security;
3118 isec = SOCK_INODE(sock)->i_security;
3119
3120 if (family == PF_INET) {
3121 addr4 = (struct sockaddr_in *)address;
3122 snum = ntohs(addr4->sin_port);
3123 addrlen = sizeof(addr4->sin_addr.s_addr);
3124 addrp = (char *)&addr4->sin_addr.s_addr;
3125 } else {
3126 addr6 = (struct sockaddr_in6 *)address;
3127 snum = ntohs(addr6->sin6_port);
3128 addrlen = sizeof(addr6->sin6_addr.s6_addr);
3129 addrp = (char *)&addr6->sin6_addr.s6_addr;
3130 }
3131
3132 if (snum&&(snum < max(PROT_SOCK,ip_local_port_range_0) ||
3133 snum > ip_local_port_range_1)) {
3134 err = security_port_sid(sk->sk_family, sk->sk_type,
3135 sk->sk_protocol, snum, &sid);
3136 if (err)
3137 goto out;
3138 AVC_AUDIT_DATA_INIT(&ad,NET);
3139 ad.u.net.sport = htons(snum);
3140 ad.u.net.family = family;
3141 err = avc_has_perm(isec->sid, sid,
3142 isec->sclass,
3143 SOCKET__NAME_BIND, &ad);
3144 if (err)
3145 goto out;
3146 }
3147
3148 switch(isec->sclass) {
3149 case SECCLASS_TCP_SOCKET:
3150 node_perm = TCP_SOCKET__NODE_BIND;
3151 break;
3152
3153 case SECCLASS_UDP_SOCKET:
3154 node_perm = UDP_SOCKET__NODE_BIND;
3155 break;
3156
3157 default:
3158 node_perm = RAWIP_SOCKET__NODE_BIND;
3159 break;
3160 }
3161
3162 err = security_node_sid(family, addrp, addrlen, &sid);
3163 if (err)
3164 goto out;
3165
3166 AVC_AUDIT_DATA_INIT(&ad,NET);
3167 ad.u.net.sport = htons(snum);
3168 ad.u.net.family = family;
3169
3170 if (family == PF_INET)
3171 ad.u.net.v4info.saddr = addr4->sin_addr.s_addr;
3172 else
3173 ipv6_addr_copy(&ad.u.net.v6info.saddr, &addr6->sin6_addr);
3174
3175 err = avc_has_perm(isec->sid, sid,
3176 isec->sclass, node_perm, &ad);
3177 if (err)
3178 goto out;
3179 }
3180 out:
3181 return err;
3182 }
3183
3184 static int selinux_socket_connect(struct socket *sock, struct sockaddr *address, int addrlen)
3185 {
3186 struct inode_security_struct *isec;
3187 int err;
3188
3189 err = socket_has_perm(current, sock, SOCKET__CONNECT);
3190 if (err)
3191 return err;
3192
3193 /*
3194 * If a TCP socket, check name_connect permission for the port.
3195 */
3196 isec = SOCK_INODE(sock)->i_security;
3197 if (isec->sclass == SECCLASS_TCP_SOCKET) {
3198 struct sock *sk = sock->sk;
3199 struct avc_audit_data ad;
3200 struct sockaddr_in *addr4 = NULL;
3201 struct sockaddr_in6 *addr6 = NULL;
3202 unsigned short snum;
3203 u32 sid;
3204
3205 if (sk->sk_family == PF_INET) {
3206 addr4 = (struct sockaddr_in *)address;
3207 if (addrlen < sizeof(struct sockaddr_in))
3208 return -EINVAL;
3209 snum = ntohs(addr4->sin_port);
3210 } else {
3211 addr6 = (struct sockaddr_in6 *)address;
3212 if (addrlen < SIN6_LEN_RFC2133)
3213 return -EINVAL;
3214 snum = ntohs(addr6->sin6_port);
3215 }
3216
3217 err = security_port_sid(sk->sk_family, sk->sk_type,
3218 sk->sk_protocol, snum, &sid);
3219 if (err)
3220 goto out;
3221
3222 AVC_AUDIT_DATA_INIT(&ad,NET);
3223 ad.u.net.dport = htons(snum);
3224 ad.u.net.family = sk->sk_family;
3225 err = avc_has_perm(isec->sid, sid, isec->sclass,
3226 TCP_SOCKET__NAME_CONNECT, &ad);
3227 if (err)
3228 goto out;
3229 }
3230
3231 out:
3232 return err;
3233 }
3234
3235 static int selinux_socket_listen(struct socket *sock, int backlog)
3236 {
3237 return socket_has_perm(current, sock, SOCKET__LISTEN);
3238 }
3239
3240 static int selinux_socket_accept(struct socket *sock, struct socket *newsock)
3241 {
3242 int err;
3243 struct inode_security_struct *isec;
3244 struct inode_security_struct *newisec;
3245
3246 err = socket_has_perm(current, sock, SOCKET__ACCEPT);
3247 if (err)
3248 return err;
3249
3250 newisec = SOCK_INODE(newsock)->i_security;
3251
3252 isec = SOCK_INODE(sock)->i_security;
3253 newisec->sclass = isec->sclass;
3254 newisec->sid = isec->sid;
3255 newisec->initialized = 1;
3256
3257 return 0;
3258 }
3259
3260 static int selinux_socket_sendmsg(struct socket *sock, struct msghdr *msg,
3261 int size)
3262 {
3263 return socket_has_perm(current, sock, SOCKET__WRITE);
3264 }
3265
3266 static int selinux_socket_recvmsg(struct socket *sock, struct msghdr *msg,
3267 int size, int flags)
3268 {
3269 return socket_has_perm(current, sock, SOCKET__READ);
3270 }
3271
3272 static int selinux_socket_getsockname(struct socket *sock)
3273 {
3274 return socket_has_perm(current, sock, SOCKET__GETATTR);
3275 }
3276
3277 static int selinux_socket_getpeername(struct socket *sock)
3278 {
3279 return socket_has_perm(current, sock, SOCKET__GETATTR);
3280 }
3281
3282 static int selinux_socket_setsockopt(struct socket *sock,int level,int optname)
3283 {
3284 return socket_has_perm(current, sock, SOCKET__SETOPT);
3285 }
3286
3287 static int selinux_socket_getsockopt(struct socket *sock, int level,
3288 int optname)
3289 {
3290 return socket_has_perm(current, sock, SOCKET__GETOPT);
3291 }
3292
3293 static int selinux_socket_shutdown(struct socket *sock, int how)
3294 {
3295 return socket_has_perm(current, sock, SOCKET__SHUTDOWN);
3296 }
3297
3298 static int selinux_socket_unix_stream_connect(struct socket *sock,
3299 struct socket *other,
3300 struct sock *newsk)
3301 {
3302 struct sk_security_struct *ssec;
3303 struct inode_security_struct *isec;
3304 struct inode_security_struct *other_isec;
3305 struct avc_audit_data ad;
3306 int err;
3307
3308 err = secondary_ops->unix_stream_connect(sock, other, newsk);
3309 if (err)
3310 return err;
3311
3312 isec = SOCK_INODE(sock)->i_security;
3313 other_isec = SOCK_INODE(other)->i_security;
3314
3315 AVC_AUDIT_DATA_INIT(&ad,NET);
3316 ad.u.net.sk = other->sk;
3317
3318 err = avc_has_perm(isec->sid, other_isec->sid,
3319 isec->sclass,
3320 UNIX_STREAM_SOCKET__CONNECTTO, &ad);
3321 if (err)
3322 return err;
3323
3324 /* connecting socket */
3325 ssec = sock->sk->sk_security;
3326 ssec->peer_sid = other_isec->sid;
3327
3328 /* server child socket */
3329 ssec = newsk->sk_security;
3330 ssec->peer_sid = isec->sid;
3331
3332 return 0;
3333 }
3334
3335 static int selinux_socket_unix_may_send(struct socket *sock,
3336 struct socket *other)
3337 {
3338 struct inode_security_struct *isec;
3339 struct inode_security_struct *other_isec;
3340 struct avc_audit_data ad;
3341 int err;
3342
3343 isec = SOCK_INODE(sock)->i_security;
3344 other_isec = SOCK_INODE(other)->i_security;
3345
3346 AVC_AUDIT_DATA_INIT(&ad,NET);
3347 ad.u.net.sk = other->sk;
3348
3349 err = avc_has_perm(isec->sid, other_isec->sid,
3350 isec->sclass, SOCKET__SENDTO, &ad);
3351 if (err)
3352 return err;
3353
3354 return 0;
3355 }
3356
3357 static int selinux_sock_rcv_skb_compat(struct sock *sk, struct sk_buff *skb,
3358 struct avc_audit_data *ad, u32 sock_sid, u16 sock_class,
3359 u16 family, char *addrp, int len)
3360 {
3361 int err = 0;
3362 u32 netif_perm, node_perm, node_sid, if_sid, recv_perm = 0;
3363
3364 if (!skb->dev)
3365 goto out;
3366
3367 err = sel_netif_sids(skb->dev, &if_sid, NULL);
3368 if (err)
3369 goto out;
3370
3371 switch (sock_class) {
3372 case SECCLASS_UDP_SOCKET:
3373 netif_perm = NETIF__UDP_RECV;
3374 node_perm = NODE__UDP_RECV;
3375 recv_perm = UDP_SOCKET__RECV_MSG;
3376 break;
3377
3378 case SECCLASS_TCP_SOCKET:
3379 netif_perm = NETIF__TCP_RECV;
3380 node_perm = NODE__TCP_RECV;
3381 recv_perm = TCP_SOCKET__RECV_MSG;
3382 break;
3383
3384 default:
3385 netif_perm = NETIF__RAWIP_RECV;
3386 node_perm = NODE__RAWIP_RECV;
3387 break;
3388 }
3389
3390 err = avc_has_perm(sock_sid, if_sid, SECCLASS_NETIF, netif_perm, ad);
3391 if (err)
3392 goto out;
3393
3394 err = security_node_sid(family, addrp, len, &node_sid);
3395 if (err)
3396 goto out;
3397
3398 err = avc_has_perm(sock_sid, node_sid, SECCLASS_NODE, node_perm, ad);
3399 if (err)
3400 goto out;
3401
3402 if (recv_perm) {
3403 u32 port_sid;
3404
3405 err = security_port_sid(sk->sk_family, sk->sk_type,
3406 sk->sk_protocol, ntohs(ad->u.net.sport),
3407 &port_sid);
3408 if (err)
3409 goto out;
3410
3411 err = avc_has_perm(sock_sid, port_sid,
3412 sock_class, recv_perm, ad);
3413 }
3414
3415 out:
3416 return err;
3417 }
3418
3419 static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
3420 {
3421 u16 family;
3422 u16 sock_class = 0;
3423 char *addrp;
3424 int len, err = 0;
3425 u32 sock_sid = 0;
3426 struct socket *sock;
3427 struct avc_audit_data ad;
3428
3429 family = sk->sk_family;
3430 if (family != PF_INET && family != PF_INET6)
3431 goto out;
3432
3433 /* Handle mapped IPv4 packets arriving via IPv6 sockets */
3434 if (family == PF_INET6 && skb->protocol == ntohs(ETH_P_IP))
3435 family = PF_INET;
3436
3437 read_lock_bh(&sk->sk_callback_lock);
3438 sock = sk->sk_socket;
3439 if (sock) {
3440 struct inode *inode;
3441 inode = SOCK_INODE(sock);
3442 if (inode) {
3443 struct inode_security_struct *isec;
3444 isec = inode->i_security;
3445 sock_sid = isec->sid;
3446 sock_class = isec->sclass;
3447 }
3448 }
3449 read_unlock_bh(&sk->sk_callback_lock);
3450 if (!sock_sid)
3451 goto out;
3452
3453 AVC_AUDIT_DATA_INIT(&ad, NET);
3454 ad.u.net.netif = skb->dev ? skb->dev->name : "[unknown]";
3455 ad.u.net.family = family;
3456
3457 err = selinux_parse_skb(skb, &ad, &addrp, &len, 1);
3458 if (err)
3459 goto out;
3460
3461 if (selinux_compat_net)
3462 err = selinux_sock_rcv_skb_compat(sk, skb, &ad, sock_sid,
3463 sock_class, family,
3464 addrp, len);
3465 else
3466 err = avc_has_perm(sock_sid, skb->secmark, SECCLASS_PACKET,
3467 PACKET__RECV, &ad);
3468 if (err)
3469 goto out;
3470
3471 err = selinux_xfrm_sock_rcv_skb(sock_sid, skb, &ad);
3472 out:
3473 return err;
3474 }
3475
3476 static int selinux_socket_getpeersec_stream(struct socket *sock, char __user *optval,
3477 int __user *optlen, unsigned len)
3478 {
3479 int err = 0;
3480 char *scontext;
3481 u32 scontext_len;
3482 struct sk_security_struct *ssec;
3483 struct inode_security_struct *isec;
3484 u32 peer_sid = 0;
3485
3486 isec = SOCK_INODE(sock)->i_security;
3487
3488 /* if UNIX_STREAM check peer_sid, if TCP check dst for labelled sa */
3489 if (isec->sclass == SECCLASS_UNIX_STREAM_SOCKET) {
3490 ssec = sock->sk->sk_security;
3491 peer_sid = ssec->peer_sid;
3492 }
3493 else if (isec->sclass == SECCLASS_TCP_SOCKET) {
3494 peer_sid = selinux_socket_getpeer_stream(sock->sk);
3495
3496 if (peer_sid == SECSID_NULL) {
3497 err = -ENOPROTOOPT;
3498 goto out;
3499 }
3500 }
3501 else {
3502 err = -ENOPROTOOPT;
3503 goto out;
3504 }
3505
3506 err = security_sid_to_context(peer_sid, &scontext, &scontext_len);
3507
3508 if (err)
3509 goto out;
3510
3511 if (scontext_len > len) {
3512 err = -ERANGE;
3513 goto out_len;
3514 }
3515
3516 if (copy_to_user(optval, scontext, scontext_len))
3517 err = -EFAULT;
3518
3519 out_len:
3520 if (put_user(scontext_len, optlen))
3521 err = -EFAULT;
3522
3523 kfree(scontext);
3524 out:
3525 return err;
3526 }
3527
3528 static int selinux_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
3529 {
3530 u32 peer_secid = SECSID_NULL;
3531 int err = 0;
3532
3533 if (sock && (sock->sk->sk_family == PF_UNIX))
3534 selinux_get_inode_sid(SOCK_INODE(sock), &peer_secid);
3535 else if (skb)
3536 peer_secid = selinux_socket_getpeer_dgram(skb);
3537
3538 if (peer_secid == SECSID_NULL)
3539 err = -EINVAL;
3540 *secid = peer_secid;
3541
3542 return err;
3543 }
3544
3545 static int selinux_sk_alloc_security(struct sock *sk, int family, gfp_t priority)
3546 {
3547 return sk_alloc_security(sk, family, priority);
3548 }
3549
3550 static void selinux_sk_free_security(struct sock *sk)
3551 {
3552 sk_free_security(sk);
3553 }
3554
3555 static void selinux_sk_clone_security(const struct sock *sk, struct sock *newsk)
3556 {
3557 struct sk_security_struct *ssec = sk->sk_security;
3558 struct sk_security_struct *newssec = newsk->sk_security;
3559
3560 newssec->sid = ssec->sid;
3561 newssec->peer_sid = ssec->peer_sid;
3562 }
3563
3564 static void selinux_sk_getsecid(struct sock *sk, u32 *secid)
3565 {
3566 if (!sk)
3567 *secid = SECINITSID_ANY_SOCKET;
3568 else {
3569 struct sk_security_struct *sksec = sk->sk_security;
3570
3571 *secid = sksec->sid;
3572 }
3573 }
3574
3575 static int selinux_nlmsg_perm(struct sock *sk, struct sk_buff *skb)
3576 {
3577 int err = 0;
3578 u32 perm;
3579 struct nlmsghdr *nlh;
3580 struct socket *sock = sk->sk_socket;
3581 struct inode_security_struct *isec = SOCK_INODE(sock)->i_security;
3582
3583 if (skb->len < NLMSG_SPACE(0)) {
3584 err = -EINVAL;
3585 goto out;
3586 }
3587 nlh = (struct nlmsghdr *)skb->data;
3588
3589 err = selinux_nlmsg_lookup(isec->sclass, nlh->nlmsg_type, &perm);
3590 if (err) {
3591 if (err == -EINVAL) {
3592 audit_log(current->audit_context, GFP_KERNEL, AUDIT_SELINUX_ERR,
3593 "SELinux: unrecognized netlink message"
3594 " type=%hu for sclass=%hu\n",
3595 nlh->nlmsg_type, isec->sclass);
3596 if (!selinux_enforcing)
3597 err = 0;
3598 }
3599
3600 /* Ignore */
3601 if (err == -ENOENT)
3602 err = 0;
3603 goto out;
3604 }
3605
3606 err = socket_has_perm(current, sock, perm);
3607 out:
3608 return err;
3609 }
3610
3611 #ifdef CONFIG_NETFILTER
3612
3613 static int selinux_ip_postroute_last_compat(struct sock *sk, struct net_device *dev,
3614 struct inode_security_struct *isec,
3615 struct avc_audit_data *ad,
3616 u16 family, char *addrp, int len)
3617 {
3618 int err;
3619 u32 netif_perm, node_perm, node_sid, if_sid, send_perm = 0;
3620
3621 err = sel_netif_sids(dev, &if_sid, NULL);
3622 if (err)
3623 goto out;
3624
3625 switch (isec->sclass) {
3626 case SECCLASS_UDP_SOCKET:
3627 netif_perm = NETIF__UDP_SEND;
3628 node_perm = NODE__UDP_SEND;
3629 send_perm = UDP_SOCKET__SEND_MSG;
3630 break;
3631
3632 case SECCLASS_TCP_SOCKET:
3633 netif_perm = NETIF__TCP_SEND;
3634 node_perm = NODE__TCP_SEND;
3635 send_perm = TCP_SOCKET__SEND_MSG;
3636 break;
3637
3638 default:
3639 netif_perm = NETIF__RAWIP_SEND;
3640 node_perm = NODE__RAWIP_SEND;
3641 break;
3642 }
3643
3644 err = avc_has_perm(isec->sid, if_sid, SECCLASS_NETIF, netif_perm, ad);
3645 if (err)
3646 goto out;
3647
3648 err = security_node_sid(family, addrp, len, &node_sid);
3649 if (err)
3650 goto out;
3651
3652 err = avc_has_perm(isec->sid, node_sid, SECCLASS_NODE, node_perm, ad);
3653 if (err)
3654 goto out;
3655
3656 if (send_perm) {
3657 u32 port_sid;
3658
3659 err = security_port_sid(sk->sk_family,
3660 sk->sk_type,
3661 sk->sk_protocol,
3662 ntohs(ad->u.net.dport),
3663 &port_sid);
3664 if (err)
3665 goto out;
3666
3667 err = avc_has_perm(isec->sid, port_sid, isec->sclass,
3668 send_perm, ad);
3669 }
3670 out:
3671 return err;
3672 }
3673
3674 static unsigned int selinux_ip_postroute_last(unsigned int hooknum,
3675 struct sk_buff **pskb,
3676 const struct net_device *in,
3677 const struct net_device *out,
3678 int (*okfn)(struct sk_buff *),
3679 u16 family)
3680 {
3681 char *addrp;
3682 int len, err = 0;
3683 struct sock *sk;
3684 struct socket *sock;
3685 struct inode *inode;
3686 struct sk_buff *skb = *pskb;
3687 struct inode_security_struct *isec;
3688 struct avc_audit_data ad;
3689 struct net_device *dev = (struct net_device *)out;
3690
3691 sk = skb->sk;
3692 if (!sk)
3693 goto out;
3694
3695 sock = sk->sk_socket;
3696 if (!sock)
3697 goto out;
3698
3699 inode = SOCK_INODE(sock);
3700 if (!inode)
3701 goto out;
3702
3703 isec = inode->i_security;
3704
3705 AVC_AUDIT_DATA_INIT(&ad, NET);
3706 ad.u.net.netif = dev->name;
3707 ad.u.net.family = family;
3708
3709 err = selinux_parse_skb(skb, &ad, &addrp, &len, 0);
3710 if (err)
3711 goto out;
3712
3713 if (selinux_compat_net)
3714 err = selinux_ip_postroute_last_compat(sk, dev, isec, &ad,
3715 family, addrp, len);
3716 else
3717 err = avc_has_perm(isec->sid, skb->secmark, SECCLASS_PACKET,
3718 PACKET__SEND, &ad);
3719
3720 if (err)
3721 goto out;
3722
3723 err = selinux_xfrm_postroute_last(isec->sid, skb, &ad);
3724 out:
3725 return err ? NF_DROP : NF_ACCEPT;
3726 }
3727
3728 static unsigned int selinux_ipv4_postroute_last(unsigned int hooknum,
3729 struct sk_buff **pskb,
3730 const struct net_device *in,
3731 const struct net_device *out,
3732 int (*okfn)(struct sk_buff *))
3733 {
3734 return selinux_ip_postroute_last(hooknum, pskb, in, out, okfn, PF_INET);
3735 }
3736
3737 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3738
3739 static unsigned int selinux_ipv6_postroute_last(unsigned int hooknum,
3740 struct sk_buff **pskb,
3741 const struct net_device *in,
3742 const struct net_device *out,
3743 int (*okfn)(struct sk_buff *))
3744 {
3745 return selinux_ip_postroute_last(hooknum, pskb, in, out, okfn, PF_INET6);
3746 }
3747
3748 #endif /* IPV6 */
3749
3750 #endif /* CONFIG_NETFILTER */
3751
3752 static int selinux_netlink_send(struct sock *sk, struct sk_buff *skb)
3753 {
3754 int err;
3755
3756 err = secondary_ops->netlink_send(sk, skb);
3757 if (err)
3758 return err;
3759
3760 if (policydb_loaded_version >= POLICYDB_VERSION_NLCLASS)
3761 err = selinux_nlmsg_perm(sk, skb);
3762
3763 return err;
3764 }
3765
3766 static int selinux_netlink_recv(struct sk_buff *skb, int capability)
3767 {
3768 int err;
3769 struct avc_audit_data ad;
3770
3771 err = secondary_ops->netlink_recv(skb, capability);
3772 if (err)
3773 return err;
3774
3775 AVC_AUDIT_DATA_INIT(&ad, CAP);
3776 ad.u.cap = capability;
3777
3778 return avc_has_perm(NETLINK_CB(skb).sid, NETLINK_CB(skb).sid,
3779 SECCLASS_CAPABILITY, CAP_TO_MASK(capability), &ad);
3780 }
3781
3782 static int ipc_alloc_security(struct task_struct *task,
3783 struct kern_ipc_perm *perm,
3784 u16 sclass)
3785 {
3786 struct task_security_struct *tsec = task->security;
3787 struct ipc_security_struct *isec;
3788
3789 isec = kzalloc(sizeof(struct ipc_security_struct), GFP_KERNEL);
3790 if (!isec)
3791 return -ENOMEM;
3792
3793 isec->sclass = sclass;
3794 isec->ipc_perm = perm;
3795 isec->sid = tsec->sid;
3796 perm->security = isec;
3797
3798 return 0;
3799 }
3800
3801 static void ipc_free_security(struct kern_ipc_perm *perm)
3802 {
3803 struct ipc_security_struct *isec = perm->security;
3804 perm->security = NULL;
3805 kfree(isec);
3806 }
3807
3808 static int msg_msg_alloc_security(struct msg_msg *msg)
3809 {
3810 struct msg_security_struct *msec;
3811
3812 msec = kzalloc(sizeof(struct msg_security_struct), GFP_KERNEL);
3813 if (!msec)
3814 return -ENOMEM;
3815
3816 msec->msg = msg;
3817 msec->sid = SECINITSID_UNLABELED;
3818 msg->security = msec;
3819
3820 return 0;
3821 }
3822
3823 static void msg_msg_free_security(struct msg_msg *msg)
3824 {
3825 struct msg_security_struct *msec = msg->security;
3826
3827 msg->security = NULL;
3828 kfree(msec);
3829 }
3830
3831 static int ipc_has_perm(struct kern_ipc_perm *ipc_perms,
3832 u32 perms)
3833 {
3834 struct task_security_struct *tsec;
3835 struct ipc_security_struct *isec;
3836 struct avc_audit_data ad;
3837
3838 tsec = current->security;
3839 isec = ipc_perms->security;
3840
3841 AVC_AUDIT_DATA_INIT(&ad, IPC);
3842 ad.u.ipc_id = ipc_perms->key;
3843
3844 return avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, &ad);
3845 }
3846
3847 static int selinux_msg_msg_alloc_security(struct msg_msg *msg)
3848 {
3849 return msg_msg_alloc_security(msg);
3850 }
3851
3852 static void selinux_msg_msg_free_security(struct msg_msg *msg)
3853 {
3854 msg_msg_free_security(msg);
3855 }
3856
3857 /* message queue security operations */
3858 static int selinux_msg_queue_alloc_security(struct msg_queue *msq)
3859 {
3860 struct task_security_struct *tsec;
3861 struct ipc_security_struct *isec;
3862 struct avc_audit_data ad;
3863 int rc;
3864
3865 rc = ipc_alloc_security(current, &msq->q_perm, SECCLASS_MSGQ);
3866 if (rc)
3867 return rc;
3868
3869 tsec = current->security;
3870 isec = msq->q_perm.security;
3871
3872 AVC_AUDIT_DATA_INIT(&ad, IPC);
3873 ad.u.ipc_id = msq->q_perm.key;
3874
3875 rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_MSGQ,
3876 MSGQ__CREATE, &ad);
3877 if (rc) {
3878 ipc_free_security(&msq->q_perm);
3879 return rc;
3880 }
3881 return 0;
3882 }
3883
3884 static void selinux_msg_queue_free_security(struct msg_queue *msq)
3885 {
3886 ipc_free_security(&msq->q_perm);
3887 }
3888
3889 static int selinux_msg_queue_associate(struct msg_queue *msq, int msqflg)
3890 {
3891 struct task_security_struct *tsec;
3892 struct ipc_security_struct *isec;
3893 struct avc_audit_data ad;
3894
3895 tsec = current->security;
3896 isec = msq->q_perm.security;
3897
3898 AVC_AUDIT_DATA_INIT(&ad, IPC);
3899 ad.u.ipc_id = msq->q_perm.key;
3900
3901 return avc_has_perm(tsec->sid, isec->sid, SECCLASS_MSGQ,
3902 MSGQ__ASSOCIATE, &ad);
3903 }
3904
3905 static int selinux_msg_queue_msgctl(struct msg_queue *msq, int cmd)
3906 {
3907 int err;
3908 int perms;
3909
3910 switch(cmd) {
3911 case IPC_INFO:
3912 case MSG_INFO:
3913 /* No specific object, just general system-wide information. */
3914 return task_has_system(current, SYSTEM__IPC_INFO);
3915 case IPC_STAT:
3916 case MSG_STAT:
3917 perms = MSGQ__GETATTR | MSGQ__ASSOCIATE;
3918 break;
3919 case IPC_SET:
3920 perms = MSGQ__SETATTR;
3921 break;
3922 case IPC_RMID:
3923 perms = MSGQ__DESTROY;
3924 break;
3925 default:
3926 return 0;
3927 }
3928
3929 err = ipc_has_perm(&msq->q_perm, perms);
3930 return err;
3931 }
3932
3933 static int selinux_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, int msqflg)
3934 {
3935 struct task_security_struct *tsec;
3936 struct ipc_security_struct *isec;
3937 struct msg_security_struct *msec;
3938 struct avc_audit_data ad;
3939 int rc;
3940
3941 tsec = current->security;
3942 isec = msq->q_perm.security;
3943 msec = msg->security;
3944
3945 /*
3946 * First time through, need to assign label to the message
3947 */
3948 if (msec->sid == SECINITSID_UNLABELED) {
3949 /*
3950 * Compute new sid based on current process and
3951 * message queue this message will be stored in
3952 */
3953 rc = security_transition_sid(tsec->sid,
3954 isec->sid,
3955 SECCLASS_MSG,
3956 &msec->sid);
3957 if (rc)
3958 return rc;
3959 }
3960
3961 AVC_AUDIT_DATA_INIT(&ad, IPC);
3962 ad.u.ipc_id = msq->q_perm.key;
3963
3964 /* Can this process write to the queue? */
3965 rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_MSGQ,
3966 MSGQ__WRITE, &ad);
3967 if (!rc)
3968 /* Can this process send the message */
3969 rc = avc_has_perm(tsec->sid, msec->sid,
3970 SECCLASS_MSG, MSG__SEND, &ad);
3971 if (!rc)
3972 /* Can the message be put in the queue? */
3973 rc = avc_has_perm(msec->sid, isec->sid,
3974 SECCLASS_MSGQ, MSGQ__ENQUEUE, &ad);
3975
3976 return rc;
3977 }
3978
3979 static int selinux_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
3980 struct task_struct *target,
3981 long type, int mode)
3982 {
3983 struct task_security_struct *tsec;
3984 struct ipc_security_struct *isec;
3985 struct msg_security_struct *msec;
3986 struct avc_audit_data ad;
3987 int rc;
3988
3989 tsec = target->security;
3990 isec = msq->q_perm.security;
3991 msec = msg->security;
3992
3993 AVC_AUDIT_DATA_INIT(&ad, IPC);
3994 ad.u.ipc_id = msq->q_perm.key;
3995
3996 rc = avc_has_perm(tsec->sid, isec->sid,
3997 SECCLASS_MSGQ, MSGQ__READ, &ad);
3998 if (!rc)
3999 rc = avc_has_perm(tsec->sid, msec->sid,
4000 SECCLASS_MSG, MSG__RECEIVE, &ad);
4001 return rc;
4002 }
4003
4004 /* Shared Memory security operations */
4005 static int selinux_shm_alloc_security(struct shmid_kernel *shp)
4006 {
4007 struct task_security_struct *tsec;
4008 struct ipc_security_struct *isec;
4009 struct avc_audit_data ad;
4010 int rc;
4011
4012 rc = ipc_alloc_security(current, &shp->shm_perm, SECCLASS_SHM);
4013 if (rc)
4014 return rc;
4015
4016 tsec = current->security;
4017 isec = shp->shm_perm.security;
4018
4019 AVC_AUDIT_DATA_INIT(&ad, IPC);
4020 ad.u.ipc_id = shp->shm_perm.key;
4021
4022 rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_SHM,
4023 SHM__CREATE, &ad);
4024 if (rc) {
4025 ipc_free_security(&shp->shm_perm);
4026 return rc;
4027 }
4028 return 0;
4029 }
4030
4031 static void selinux_shm_free_security(struct shmid_kernel *shp)
4032 {
4033 ipc_free_security(&shp->shm_perm);
4034 }
4035
4036 static int selinux_shm_associate(struct shmid_kernel *shp, int shmflg)
4037 {
4038 struct task_security_struct *tsec;
4039 struct ipc_security_struct *isec;
4040 struct avc_audit_data ad;
4041
4042 tsec = current->security;
4043 isec = shp->shm_perm.security;
4044
4045 AVC_AUDIT_DATA_INIT(&ad, IPC);
4046 ad.u.ipc_id = shp->shm_perm.key;
4047
4048 return avc_has_perm(tsec->sid, isec->sid, SECCLASS_SHM,
4049 SHM__ASSOCIATE, &ad);
4050 }
4051
4052 /* Note, at this point, shp is locked down */
4053 static int selinux_shm_shmctl(struct shmid_kernel *shp, int cmd)
4054 {
4055 int perms;
4056 int err;
4057
4058 switch(cmd) {
4059 case IPC_INFO:
4060 case SHM_INFO:
4061 /* No specific object, just general system-wide information. */
4062 return task_has_system(current, SYSTEM__IPC_INFO);
4063 case IPC_STAT:
4064 case SHM_STAT:
4065 perms = SHM__GETATTR | SHM__ASSOCIATE;
4066 break;
4067 case IPC_SET:
4068 perms = SHM__SETATTR;
4069 break;
4070 case SHM_LOCK:
4071 case SHM_UNLOCK:
4072 perms = SHM__LOCK;
4073 break;
4074 case IPC_RMID:
4075 perms = SHM__DESTROY;
4076 break;
4077 default:
4078 return 0;
4079 }
4080
4081 err = ipc_has_perm(&shp->shm_perm, perms);
4082 return err;
4083 }
4084
4085 static int selinux_shm_shmat(struct shmid_kernel *shp,
4086 char __user *shmaddr, int shmflg)
4087 {
4088 u32 perms;
4089 int rc;
4090
4091 rc = secondary_ops->shm_shmat(shp, shmaddr, shmflg);
4092 if (rc)
4093 return rc;
4094
4095 if (shmflg & SHM_RDONLY)
4096 perms = SHM__READ;
4097 else
4098 perms = SHM__READ | SHM__WRITE;
4099
4100 return ipc_has_perm(&shp->shm_perm, perms);
4101 }
4102
4103 /* Semaphore security operations */
4104 static int selinux_sem_alloc_security(struct sem_array *sma)
4105 {
4106 struct task_security_struct *tsec;
4107 struct ipc_security_struct *isec;
4108 struct avc_audit_data ad;
4109 int rc;
4110
4111 rc = ipc_alloc_security(current, &sma->sem_perm, SECCLASS_SEM);
4112 if (rc)
4113 return rc;
4114
4115 tsec = current->security;
4116 isec = sma->sem_perm.security;
4117
4118 AVC_AUDIT_DATA_INIT(&ad, IPC);
4119 ad.u.ipc_id = sma->sem_perm.key;
4120
4121 rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_SEM,
4122 SEM__CREATE, &ad);
4123 if (rc) {
4124 ipc_free_security(&sma->sem_perm);
4125 return rc;
4126 }
4127 return 0;
4128 }
4129
4130 static void selinux_sem_free_security(struct sem_array *sma)
4131 {
4132 ipc_free_security(&sma->sem_perm);
4133 }
4134
4135 static int selinux_sem_associate(struct sem_array *sma, int semflg)
4136 {
4137 struct task_security_struct *tsec;
4138 struct ipc_security_struct *isec;
4139 struct avc_audit_data ad;
4140
4141 tsec = current->security;
4142 isec = sma->sem_perm.security;
4143
4144 AVC_AUDIT_DATA_INIT(&ad, IPC);
4145 ad.u.ipc_id = sma->sem_perm.key;
4146
4147 return avc_has_perm(tsec->sid, isec->sid, SECCLASS_SEM,
4148 SEM__ASSOCIATE, &ad);
4149 }
4150
4151 /* Note, at this point, sma is locked down */
4152 static int selinux_sem_semctl(struct sem_array *sma, int cmd)
4153 {
4154 int err;
4155 u32 perms;
4156
4157 switch(cmd) {
4158 case IPC_INFO:
4159 case SEM_INFO:
4160 /* No specific object, just general system-wide information. */
4161 return task_has_system(current, SYSTEM__IPC_INFO);
4162 case GETPID:
4163 case GETNCNT:
4164 case GETZCNT:
4165 perms = SEM__GETATTR;
4166 break;
4167 case GETVAL:
4168 case GETALL:
4169 perms = SEM__READ;
4170 break;
4171 case SETVAL:
4172 case SETALL:
4173 perms = SEM__WRITE;
4174 break;
4175 case IPC_RMID:
4176 perms = SEM__DESTROY;
4177 break;
4178 case IPC_SET:
4179 perms = SEM__SETATTR;
4180 break;
4181 case IPC_STAT:
4182 case SEM_STAT:
4183 perms = SEM__GETATTR | SEM__ASSOCIATE;
4184 break;
4185 default:
4186 return 0;
4187 }
4188
4189 err = ipc_has_perm(&sma->sem_perm, perms);
4190 return err;
4191 }
4192
4193 static int selinux_sem_semop(struct sem_array *sma,
4194 struct sembuf *sops, unsigned nsops, int alter)
4195 {
4196 u32 perms;
4197
4198 if (alter)
4199 perms = SEM__READ | SEM__WRITE;
4200 else
4201 perms = SEM__READ;
4202
4203 return ipc_has_perm(&sma->sem_perm, perms);
4204 }
4205
4206 static int selinux_ipc_permission(struct kern_ipc_perm *ipcp, short flag)
4207 {
4208 u32 av = 0;
4209
4210 av = 0;
4211 if (flag & S_IRUGO)
4212 av |= IPC__UNIX_READ;
4213 if (flag & S_IWUGO)
4214 av |= IPC__UNIX_WRITE;
4215
4216 if (av == 0)
4217 return 0;
4218
4219 return ipc_has_perm(ipcp, av);
4220 }
4221
4222 /* module stacking operations */
4223 static int selinux_register_security (const char *name, struct security_operations *ops)
4224 {
4225 if (secondary_ops != original_ops) {
4226 printk(KERN_INFO "%s: There is already a secondary security "
4227 "module registered.\n", __FUNCTION__);
4228 return -EINVAL;
4229 }
4230
4231 secondary_ops = ops;
4232
4233 printk(KERN_INFO "%s: Registering secondary module %s\n",
4234 __FUNCTION__,
4235 name);
4236
4237 return 0;
4238 }
4239
4240 static int selinux_unregister_security (const char *name, struct security_operations *ops)
4241 {
4242 if (ops != secondary_ops) {
4243 printk (KERN_INFO "%s: trying to unregister a security module "
4244 "that is not registered.\n", __FUNCTION__);
4245 return -EINVAL;
4246 }
4247
4248 secondary_ops = original_ops;
4249
4250 return 0;
4251 }
4252
4253 static void selinux_d_instantiate (struct dentry *dentry, struct inode *inode)
4254 {
4255 if (inode)
4256 inode_doinit_with_dentry(inode, dentry);
4257 }
4258
4259 static int selinux_getprocattr(struct task_struct *p,
4260 char *name, void *value, size_t size)
4261 {
4262 struct task_security_struct *tsec;
4263 u32 sid;
4264 int error;
4265
4266 if (current != p) {
4267 error = task_has_perm(current, p, PROCESS__GETATTR);
4268 if (error)
4269 return error;
4270 }
4271
4272 tsec = p->security;
4273
4274 if (!strcmp(name, "current"))
4275 sid = tsec->sid;
4276 else if (!strcmp(name, "prev"))
4277 sid = tsec->osid;
4278 else if (!strcmp(name, "exec"))
4279 sid = tsec->exec_sid;
4280 else if (!strcmp(name, "fscreate"))
4281 sid = tsec->create_sid;
4282 else if (!strcmp(name, "keycreate"))
4283 sid = tsec->keycreate_sid;
4284 else if (!strcmp(name, "sockcreate"))
4285 sid = tsec->sockcreate_sid;
4286 else
4287 return -EINVAL;
4288
4289 if (!sid)
4290 return 0;
4291
4292 return selinux_getsecurity(sid, value, size);
4293 }
4294
4295 static int selinux_setprocattr(struct task_struct *p,
4296 char *name, void *value, size_t size)
4297 {
4298 struct task_security_struct *tsec;
4299 u32 sid = 0;
4300 int error;
4301 char *str = value;
4302
4303 if (current != p) {
4304 /* SELinux only allows a process to change its own
4305 security attributes. */
4306 return -EACCES;
4307 }
4308
4309 /*
4310 * Basic control over ability to set these attributes at all.
4311 * current == p, but we'll pass them separately in case the
4312 * above restriction is ever removed.
4313 */
4314 if (!strcmp(name, "exec"))
4315 error = task_has_perm(current, p, PROCESS__SETEXEC);
4316 else if (!strcmp(name, "fscreate"))
4317 error = task_has_perm(current, p, PROCESS__SETFSCREATE);
4318 else if (!strcmp(name, "keycreate"))
4319 error = task_has_perm(current, p, PROCESS__SETKEYCREATE);
4320 else if (!strcmp(name, "sockcreate"))
4321 error = task_has_perm(current, p, PROCESS__SETSOCKCREATE);
4322 else if (!strcmp(name, "current"))
4323 error = task_has_perm(current, p, PROCESS__SETCURRENT);
4324 else
4325 error = -EINVAL;
4326 if (error)
4327 return error;
4328
4329 /* Obtain a SID for the context, if one was specified. */
4330 if (size && str[1] && str[1] != '\n') {
4331 if (str[size-1] == '\n') {
4332 str[size-1] = 0;
4333 size--;
4334 }
4335 error = security_context_to_sid(value, size, &sid);
4336 if (error)
4337 return error;
4338 }
4339
4340 /* Permission checking based on the specified context is
4341 performed during the actual operation (execve,
4342 open/mkdir/...), when we know the full context of the
4343 operation. See selinux_bprm_set_security for the execve
4344 checks and may_create for the file creation checks. The
4345 operation will then fail if the context is not permitted. */
4346 tsec = p->security;
4347 if (!strcmp(name, "exec"))
4348 tsec->exec_sid = sid;
4349 else if (!strcmp(name, "fscreate"))
4350 tsec->create_sid = sid;
4351 else if (!strcmp(name, "keycreate")) {
4352 error = may_create_key(sid, p);
4353 if (error)
4354 return error;
4355 tsec->keycreate_sid = sid;
4356 } else if (!strcmp(name, "sockcreate"))
4357 tsec->sockcreate_sid = sid;
4358 else if (!strcmp(name, "current")) {
4359 struct av_decision avd;
4360
4361 if (sid == 0)
4362 return -EINVAL;
4363
4364 /* Only allow single threaded processes to change context */
4365 if (atomic_read(&p->mm->mm_users) != 1) {
4366 struct task_struct *g, *t;
4367 struct mm_struct *mm = p->mm;
4368 read_lock(&tasklist_lock);
4369 do_each_thread(g, t)
4370 if (t->mm == mm && t != p) {
4371 read_unlock(&tasklist_lock);
4372 return -EPERM;
4373 }
4374 while_each_thread(g, t);
4375 read_unlock(&tasklist_lock);
4376 }
4377
4378 /* Check permissions for the transition. */
4379 error = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS,
4380 PROCESS__DYNTRANSITION, NULL);
4381 if (error)
4382 return error;
4383
4384 /* Check for ptracing, and update the task SID if ok.
4385 Otherwise, leave SID unchanged and fail. */
4386 task_lock(p);
4387 if (p->ptrace & PT_PTRACED) {
4388 error = avc_has_perm_noaudit(tsec->ptrace_sid, sid,
4389 SECCLASS_PROCESS,
4390 PROCESS__PTRACE, &avd);
4391 if (!error)
4392 tsec->sid = sid;
4393 task_unlock(p);
4394 avc_audit(tsec->ptrace_sid, sid, SECCLASS_PROCESS,
4395 PROCESS__PTRACE, &avd, error, NULL);
4396 if (error)
4397 return error;
4398 } else {
4399 tsec->sid = sid;
4400 task_unlock(p);
4401 }
4402 }
4403 else
4404 return -EINVAL;
4405
4406 return size;
4407 }
4408
4409 static int selinux_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
4410 {
4411 return security_sid_to_context(secid, secdata, seclen);
4412 }
4413
4414 static void selinux_release_secctx(char *secdata, u32 seclen)
4415 {
4416 if (secdata)
4417 kfree(secdata);
4418 }
4419
4420 #ifdef CONFIG_KEYS
4421
4422 static int selinux_key_alloc(struct key *k, struct task_struct *tsk,
4423 unsigned long flags)
4424 {
4425 struct task_security_struct *tsec = tsk->security;
4426 struct key_security_struct *ksec;
4427
4428 ksec = kzalloc(sizeof(struct key_security_struct), GFP_KERNEL);
4429 if (!ksec)
4430 return -ENOMEM;
4431
4432 ksec->obj = k;
4433 if (tsec->keycreate_sid)
4434 ksec->sid = tsec->keycreate_sid;
4435 else
4436 ksec->sid = tsec->sid;
4437 k->security = ksec;
4438
4439 return 0;
4440 }
4441
4442 static void selinux_key_free(struct key *k)
4443 {
4444 struct key_security_struct *ksec = k->security;
4445
4446 k->security = NULL;
4447 kfree(ksec);
4448 }
4449
4450 static int selinux_key_permission(key_ref_t key_ref,
4451 struct task_struct *ctx,
4452 key_perm_t perm)
4453 {
4454 struct key *key;
4455 struct task_security_struct *tsec;
4456 struct key_security_struct *ksec;
4457
4458 key = key_ref_to_ptr(key_ref);
4459
4460 tsec = ctx->security;
4461 ksec = key->security;
4462
4463 /* if no specific permissions are requested, we skip the
4464 permission check. No serious, additional covert channels
4465 appear to be created. */
4466 if (perm == 0)
4467 return 0;
4468
4469 return avc_has_perm(tsec->sid, ksec->sid,
4470 SECCLASS_KEY, perm, NULL);
4471 }
4472
4473 #endif
4474
4475 static struct security_operations selinux_ops = {
4476 .ptrace = selinux_ptrace,
4477 .capget = selinux_capget,
4478 .capset_check = selinux_capset_check,
4479 .capset_set = selinux_capset_set,
4480 .sysctl = selinux_sysctl,
4481 .capable = selinux_capable,
4482 .quotactl = selinux_quotactl,
4483 .quota_on = selinux_quota_on,
4484 .syslog = selinux_syslog,
4485 .vm_enough_memory = selinux_vm_enough_memory,
4486
4487 .netlink_send = selinux_netlink_send,
4488 .netlink_recv = selinux_netlink_recv,
4489
4490 .bprm_alloc_security = selinux_bprm_alloc_security,
4491 .bprm_free_security = selinux_bprm_free_security,
4492 .bprm_apply_creds = selinux_bprm_apply_creds,
4493 .bprm_post_apply_creds = selinux_bprm_post_apply_creds,
4494 .bprm_set_security = selinux_bprm_set_security,
4495 .bprm_check_security = selinux_bprm_check_security,
4496 .bprm_secureexec = selinux_bprm_secureexec,
4497
4498 .sb_alloc_security = selinux_sb_alloc_security,
4499 .sb_free_security = selinux_sb_free_security,
4500 .sb_copy_data = selinux_sb_copy_data,
4501 .sb_kern_mount = selinux_sb_kern_mount,
4502 .sb_statfs = selinux_sb_statfs,
4503 .sb_mount = selinux_mount,
4504 .sb_umount = selinux_umount,
4505
4506 .inode_alloc_security = selinux_inode_alloc_security,
4507 .inode_free_security = selinux_inode_free_security,
4508 .inode_init_security = selinux_inode_init_security,
4509 .inode_create = selinux_inode_create,
4510 .inode_link = selinux_inode_link,
4511 .inode_unlink = selinux_inode_unlink,
4512 .inode_symlink = selinux_inode_symlink,
4513 .inode_mkdir = selinux_inode_mkdir,
4514 .inode_rmdir = selinux_inode_rmdir,
4515 .inode_mknod = selinux_inode_mknod,
4516 .inode_rename = selinux_inode_rename,
4517 .inode_readlink = selinux_inode_readlink,
4518 .inode_follow_link = selinux_inode_follow_link,
4519 .inode_permission = selinux_inode_permission,
4520 .inode_setattr = selinux_inode_setattr,
4521 .inode_getattr = selinux_inode_getattr,
4522 .inode_setxattr = selinux_inode_setxattr,
4523 .inode_post_setxattr = selinux_inode_post_setxattr,
4524 .inode_getxattr = selinux_inode_getxattr,
4525 .inode_listxattr = selinux_inode_listxattr,
4526 .inode_removexattr = selinux_inode_removexattr,
4527 .inode_xattr_getsuffix = selinux_inode_xattr_getsuffix,
4528 .inode_getsecurity = selinux_inode_getsecurity,
4529 .inode_setsecurity = selinux_inode_setsecurity,
4530 .inode_listsecurity = selinux_inode_listsecurity,
4531
4532 .file_permission = selinux_file_permission,
4533 .file_alloc_security = selinux_file_alloc_security,
4534 .file_free_security = selinux_file_free_security,
4535 .file_ioctl = selinux_file_ioctl,
4536 .file_mmap = selinux_file_mmap,
4537 .file_mprotect = selinux_file_mprotect,
4538 .file_lock = selinux_file_lock,
4539 .file_fcntl = selinux_file_fcntl,
4540 .file_set_fowner = selinux_file_set_fowner,
4541 .file_send_sigiotask = selinux_file_send_sigiotask,
4542 .file_receive = selinux_file_receive,
4543
4544 .task_create = selinux_task_create,
4545 .task_alloc_security = selinux_task_alloc_security,
4546 .task_free_security = selinux_task_free_security,
4547 .task_setuid = selinux_task_setuid,
4548 .task_post_setuid = selinux_task_post_setuid,
4549 .task_setgid = selinux_task_setgid,
4550 .task_setpgid = selinux_task_setpgid,
4551 .task_getpgid = selinux_task_getpgid,
4552 .task_getsid = selinux_task_getsid,
4553 .task_getsecid = selinux_task_getsecid,
4554 .task_setgroups = selinux_task_setgroups,
4555 .task_setnice = selinux_task_setnice,
4556 .task_setioprio = selinux_task_setioprio,
4557 .task_getioprio = selinux_task_getioprio,
4558 .task_setrlimit = selinux_task_setrlimit,
4559 .task_setscheduler = selinux_task_setscheduler,
4560 .task_getscheduler = selinux_task_getscheduler,
4561 .task_movememory = selinux_task_movememory,
4562 .task_kill = selinux_task_kill,
4563 .task_wait = selinux_task_wait,
4564 .task_prctl = selinux_task_prctl,
4565 .task_reparent_to_init = selinux_task_reparent_to_init,
4566 .task_to_inode = selinux_task_to_inode,
4567
4568 .ipc_permission = selinux_ipc_permission,
4569
4570 .msg_msg_alloc_security = selinux_msg_msg_alloc_security,
4571 .msg_msg_free_security = selinux_msg_msg_free_security,
4572
4573 .msg_queue_alloc_security = selinux_msg_queue_alloc_security,
4574 .msg_queue_free_security = selinux_msg_queue_free_security,
4575 .msg_queue_associate = selinux_msg_queue_associate,
4576 .msg_queue_msgctl = selinux_msg_queue_msgctl,
4577 .msg_queue_msgsnd = selinux_msg_queue_msgsnd,
4578 .msg_queue_msgrcv = selinux_msg_queue_msgrcv,
4579
4580 .shm_alloc_security = selinux_shm_alloc_security,
4581 .shm_free_security = selinux_shm_free_security,
4582 .shm_associate = selinux_shm_associate,
4583 .shm_shmctl = selinux_shm_shmctl,
4584 .shm_shmat = selinux_shm_shmat,
4585
4586 .sem_alloc_security = selinux_sem_alloc_security,
4587 .sem_free_security = selinux_sem_free_security,
4588 .sem_associate = selinux_sem_associate,
4589 .sem_semctl = selinux_sem_semctl,
4590 .sem_semop = selinux_sem_semop,
4591
4592 .register_security = selinux_register_security,
4593 .unregister_security = selinux_unregister_security,
4594
4595 .d_instantiate = selinux_d_instantiate,
4596
4597 .getprocattr = selinux_getprocattr,
4598 .setprocattr = selinux_setprocattr,
4599
4600 .secid_to_secctx = selinux_secid_to_secctx,
4601 .release_secctx = selinux_release_secctx,
4602
4603 .unix_stream_connect = selinux_socket_unix_stream_connect,
4604 .unix_may_send = selinux_socket_unix_may_send,
4605
4606 .socket_create = selinux_socket_create,
4607 .socket_post_create = selinux_socket_post_create,
4608 .socket_bind = selinux_socket_bind,
4609 .socket_connect = selinux_socket_connect,
4610 .socket_listen = selinux_socket_listen,
4611 .socket_accept = selinux_socket_accept,
4612 .socket_sendmsg = selinux_socket_sendmsg,
4613 .socket_recvmsg = selinux_socket_recvmsg,
4614 .socket_getsockname = selinux_socket_getsockname,
4615 .socket_getpeername = selinux_socket_getpeername,
4616 .socket_getsockopt = selinux_socket_getsockopt,
4617 .socket_setsockopt = selinux_socket_setsockopt,
4618 .socket_shutdown = selinux_socket_shutdown,
4619 .socket_sock_rcv_skb = selinux_socket_sock_rcv_skb,
4620 .socket_getpeersec_stream = selinux_socket_getpeersec_stream,
4621 .socket_getpeersec_dgram = selinux_socket_getpeersec_dgram,
4622 .sk_alloc_security = selinux_sk_alloc_security,
4623 .sk_free_security = selinux_sk_free_security,
4624 .sk_clone_security = selinux_sk_clone_security,
4625 .sk_getsecid = selinux_sk_getsecid,
4626
4627 #ifdef CONFIG_SECURITY_NETWORK_XFRM
4628 .xfrm_policy_alloc_security = selinux_xfrm_policy_alloc,
4629 .xfrm_policy_clone_security = selinux_xfrm_policy_clone,
4630 .xfrm_policy_free_security = selinux_xfrm_policy_free,
4631 .xfrm_policy_delete_security = selinux_xfrm_policy_delete,
4632 .xfrm_state_alloc_security = selinux_xfrm_state_alloc,
4633 .xfrm_state_free_security = selinux_xfrm_state_free,
4634 .xfrm_state_delete_security = selinux_xfrm_state_delete,
4635 .xfrm_policy_lookup = selinux_xfrm_policy_lookup,
4636 .xfrm_state_pol_flow_match = selinux_xfrm_state_pol_flow_match,
4637 .xfrm_flow_state_match = selinux_xfrm_flow_state_match,
4638 .xfrm_decode_session = selinux_xfrm_decode_session,
4639 #endif
4640
4641 #ifdef CONFIG_KEYS
4642 .key_alloc = selinux_key_alloc,
4643 .key_free = selinux_key_free,
4644 .key_permission = selinux_key_permission,
4645 #endif
4646 };
4647
4648 static __init int selinux_init(void)
4649 {
4650 struct task_security_struct *tsec;
4651
4652 if (!selinux_enabled) {
4653 printk(KERN_INFO "SELinux: Disabled at boot.\n");
4654 return 0;
4655 }
4656
4657 printk(KERN_INFO "SELinux: Initializing.\n");
4658
4659 /* Set the security state for the initial task. */
4660 if (task_alloc_security(current))
4661 panic("SELinux: Failed to initialize initial task.\n");
4662 tsec = current->security;
4663 tsec->osid = tsec->sid = SECINITSID_KERNEL;
4664
4665 sel_inode_cache = kmem_cache_create("selinux_inode_security",
4666 sizeof(struct inode_security_struct),
4667 0, SLAB_PANIC, NULL, NULL);
4668 avc_init();
4669
4670 original_ops = secondary_ops = security_ops;
4671 if (!secondary_ops)
4672 panic ("SELinux: No initial security operations\n");
4673 if (register_security (&selinux_ops))
4674 panic("SELinux: Unable to register with kernel.\n");
4675
4676 if (selinux_enforcing) {
4677 printk(KERN_INFO "SELinux: Starting in enforcing mode\n");
4678 } else {
4679 printk(KERN_INFO "SELinux: Starting in permissive mode\n");
4680 }
4681
4682 #ifdef CONFIG_KEYS
4683 /* Add security information to initial keyrings */
4684 selinux_key_alloc(&root_user_keyring, current,
4685 KEY_ALLOC_NOT_IN_QUOTA);
4686 selinux_key_alloc(&root_session_keyring, current,
4687 KEY_ALLOC_NOT_IN_QUOTA);
4688 #endif
4689
4690 return 0;
4691 }
4692
4693 void selinux_complete_init(void)
4694 {
4695 printk(KERN_INFO "SELinux: Completing initialization.\n");
4696
4697 /* Set up any superblocks initialized prior to the policy load. */
4698 printk(KERN_INFO "SELinux: Setting up existing superblocks.\n");
4699 spin_lock(&sb_lock);
4700 spin_lock(&sb_security_lock);
4701 next_sb:
4702 if (!list_empty(&superblock_security_head)) {
4703 struct superblock_security_struct *sbsec =
4704 list_entry(superblock_security_head.next,
4705 struct superblock_security_struct,
4706 list);
4707 struct super_block *sb = sbsec->sb;
4708 sb->s_count++;
4709 spin_unlock(&sb_security_lock);
4710 spin_unlock(&sb_lock);
4711 down_read(&sb->s_umount);
4712 if (sb->s_root)
4713 superblock_doinit(sb, NULL);
4714 drop_super(sb);
4715 spin_lock(&sb_lock);
4716 spin_lock(&sb_security_lock);
4717 list_del_init(&sbsec->list);
4718 goto next_sb;
4719 }
4720 spin_unlock(&sb_security_lock);
4721 spin_unlock(&sb_lock);
4722 }
4723
4724 /* SELinux requires early initialization in order to label
4725 all processes and objects when they are created. */
4726 security_initcall(selinux_init);
4727
4728 #if defined(CONFIG_NETFILTER)
4729
4730 static struct nf_hook_ops selinux_ipv4_op = {
4731 .hook = selinux_ipv4_postroute_last,
4732 .owner = THIS_MODULE,
4733 .pf = PF_INET,
4734 .hooknum = NF_IP_POST_ROUTING,
4735 .priority = NF_IP_PRI_SELINUX_LAST,
4736 };
4737
4738 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
4739
4740 static struct nf_hook_ops selinux_ipv6_op = {
4741 .hook = selinux_ipv6_postroute_last,
4742 .owner = THIS_MODULE,
4743 .pf = PF_INET6,
4744 .hooknum = NF_IP6_POST_ROUTING,
4745 .priority = NF_IP6_PRI_SELINUX_LAST,
4746 };
4747
4748 #endif /* IPV6 */
4749
4750 static int __init selinux_nf_ip_init(void)
4751 {
4752 int err = 0;
4753
4754 if (!selinux_enabled)
4755 goto out;
4756
4757 printk(KERN_INFO "SELinux: Registering netfilter hooks\n");
4758
4759 err = nf_register_hook(&selinux_ipv4_op);
4760 if (err)
4761 panic("SELinux: nf_register_hook for IPv4: error %d\n", err);
4762
4763 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
4764
4765 err = nf_register_hook(&selinux_ipv6_op);
4766 if (err)
4767 panic("SELinux: nf_register_hook for IPv6: error %d\n", err);
4768
4769 #endif /* IPV6 */
4770
4771 out:
4772 return err;
4773 }
4774
4775 __initcall(selinux_nf_ip_init);
4776
4777 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
4778 static void selinux_nf_ip_exit(void)
4779 {
4780 printk(KERN_INFO "SELinux: Unregistering netfilter hooks\n");
4781
4782 nf_unregister_hook(&selinux_ipv4_op);
4783 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
4784 nf_unregister_hook(&selinux_ipv6_op);
4785 #endif /* IPV6 */
4786 }
4787 #endif
4788
4789 #else /* CONFIG_NETFILTER */
4790
4791 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
4792 #define selinux_nf_ip_exit()
4793 #endif
4794
4795 #endif /* CONFIG_NETFILTER */
4796
4797 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
4798 int selinux_disable(void)
4799 {
4800 extern void exit_sel_fs(void);
4801 static int selinux_disabled = 0;
4802
4803 if (ss_initialized) {
4804 /* Not permitted after initial policy load. */
4805 return -EINVAL;
4806 }
4807
4808 if (selinux_disabled) {
4809 /* Only do this once. */
4810 return -EINVAL;
4811 }
4812
4813 printk(KERN_INFO "SELinux: Disabled at runtime.\n");
4814
4815 selinux_disabled = 1;
4816 selinux_enabled = 0;
4817
4818 /* Reset security_ops to the secondary module, dummy or capability. */
4819 security_ops = secondary_ops;
4820
4821 /* Unregister netfilter hooks. */
4822 selinux_nf_ip_exit();
4823
4824 /* Unregister selinuxfs. */
4825 exit_sel_fs();
4826
4827 return 0;
4828 }
4829 #endif
4830
4831
Linux kernel - Deliverables
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