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selinux: Better local/forward check in selinux_ip_postroute()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / security / selinux / hooks.c
blobb520667a24bed5c992a305e8d81ee5fda540c124
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) 2003-2008 Red Hat, Inc., James Morris <jmorris@redhat.com>
13 * Eric Paris <eparis@redhat.com>
14 * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
15 * <dgoeddel@trustedcs.com>
16 * Copyright (C) 2006, 2007 Hewlett-Packard Development Company, L.P.
17 * Paul Moore <paul.moore@hp.com>
18 * Copyright (C) 2007 Hitachi Software Engineering Co., Ltd.
19 * Yuichi Nakamura <ynakam@hitachisoft.jp>
20 *
21 * This program is free software; you can redistribute it and/or modify
22 * it under the terms of the GNU General Public License version 2,
23 * as published by the Free Software Foundation.
24 */
25
26 #include <linux/init.h>
27 #include <linux/kernel.h>
28 #include <linux/tracehook.h>
29 #include <linux/errno.h>
30 #include <linux/sched.h>
31 #include <linux/security.h>
32 #include <linux/xattr.h>
33 #include <linux/capability.h>
34 #include <linux/unistd.h>
35 #include <linux/mm.h>
36 #include <linux/mman.h>
37 #include <linux/slab.h>
38 #include <linux/pagemap.h>
39 #include <linux/swap.h>
40 #include <linux/spinlock.h>
41 #include <linux/syscalls.h>
42 #include <linux/file.h>
43 #include <linux/fdtable.h>
44 #include <linux/namei.h>
45 #include <linux/mount.h>
46 #include <linux/proc_fs.h>
47 #include <linux/netfilter_ipv4.h>
48 #include <linux/netfilter_ipv6.h>
49 #include <linux/tty.h>
50 #include <net/icmp.h>
51 #include <net/ip.h> /* for local_port_range[] */
52 #include <net/tcp.h> /* struct or_callable used in sock_rcv_skb */
53 #include <net/net_namespace.h>
54 #include <net/netlabel.h>
55 #include <linux/uaccess.h>
56 #include <asm/ioctls.h>
57 #include <asm/atomic.h>
58 #include <linux/bitops.h>
59 #include <linux/interrupt.h>
60 #include <linux/netdevice.h> /* for network interface checks */
61 #include <linux/netlink.h>
62 #include <linux/tcp.h>
63 #include <linux/udp.h>
64 #include <linux/dccp.h>
65 #include <linux/quota.h>
66 #include <linux/un.h> /* for Unix socket types */
67 #include <net/af_unix.h> /* for Unix socket types */
68 #include <linux/parser.h>
69 #include <linux/nfs_mount.h>
70 #include <net/ipv6.h>
71 #include <linux/hugetlb.h>
72 #include <linux/personality.h>
73 #include <linux/sysctl.h>
74 #include <linux/audit.h>
75 #include <linux/string.h>
76 #include <linux/selinux.h>
77 #include <linux/mutex.h>
78
79 #include "avc.h"
80 #include "objsec.h"
81 #include "netif.h"
82 #include "netnode.h"
83 #include "netport.h"
84 #include "xfrm.h"
85 #include "netlabel.h"
86 #include "audit.h"
87
88 #define XATTR_SELINUX_SUFFIX "selinux"
89 #define XATTR_NAME_SELINUX XATTR_SECURITY_PREFIX XATTR_SELINUX_SUFFIX
90
91 #define NUM_SEL_MNT_OPTS 4
92
93 extern unsigned int policydb_loaded_version;
94 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
95 extern int selinux_compat_net;
96 extern struct security_operations *security_ops;
97
98 /* SECMARK reference count */
99 atomic_t selinux_secmark_refcount = ATOMIC_INIT(0);
100
101 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
102 int selinux_enforcing;
103
104 static int __init enforcing_setup(char *str)
105 {
106 unsigned long enforcing;
107 if (!strict_strtoul(str, 0, &enforcing))
108 selinux_enforcing = enforcing ? 1 : 0;
109 return 1;
110 }
111 __setup("enforcing=", enforcing_setup);
112 #endif
113
114 #ifdef CONFIG_SECURITY_SELINUX_BOOTPARAM
115 int selinux_enabled = CONFIG_SECURITY_SELINUX_BOOTPARAM_VALUE;
116
117 static int __init selinux_enabled_setup(char *str)
118 {
119 unsigned long enabled;
120 if (!strict_strtoul(str, 0, &enabled))
121 selinux_enabled = enabled ? 1 : 0;
122 return 1;
123 }
124 __setup("selinux=", selinux_enabled_setup);
125 #else
126 int selinux_enabled = 1;
127 #endif
128
129
130 /*
131 * Minimal support for a secondary security module,
132 * just to allow the use of the capability module.
133 */
134 static struct security_operations *secondary_ops;
135
136 /* Lists of inode and superblock security structures initialized
137 before the policy was loaded. */
138 static LIST_HEAD(superblock_security_head);
139 static DEFINE_SPINLOCK(sb_security_lock);
140
141 static struct kmem_cache *sel_inode_cache;
142
143 /**
144 * selinux_secmark_enabled - Check to see if SECMARK is currently enabled
145 *
146 * Description:
147 * This function checks the SECMARK reference counter to see if any SECMARK
148 * targets are currently configured, if the reference counter is greater than
149 * zero SECMARK is considered to be enabled. Returns true (1) if SECMARK is
150 * enabled, false (0) if SECMARK is disabled.
151 *
152 */
153 static int selinux_secmark_enabled(void)
154 {
155 return (atomic_read(&selinux_secmark_refcount) > 0);
156 }
157
158 /* Allocate and free functions for each kind of security blob. */
159
160 static int task_alloc_security(struct task_struct *task)
161 {
162 struct task_security_struct *tsec;
163
164 tsec = kzalloc(sizeof(struct task_security_struct), GFP_KERNEL);
165 if (!tsec)
166 return -ENOMEM;
167
168 tsec->osid = tsec->sid = SECINITSID_UNLABELED;
169 task->security = tsec;
170
171 return 0;
172 }
173
174 static void task_free_security(struct task_struct *task)
175 {
176 struct task_security_struct *tsec = task->security;
177 task->security = NULL;
178 kfree(tsec);
179 }
180
181 static int inode_alloc_security(struct inode *inode)
182 {
183 struct task_security_struct *tsec = current->security;
184 struct inode_security_struct *isec;
185
186 isec = kmem_cache_zalloc(sel_inode_cache, GFP_NOFS);
187 if (!isec)
188 return -ENOMEM;
189
190 mutex_init(&isec->lock);
191 INIT_LIST_HEAD(&isec->list);
192 isec->inode = inode;
193 isec->sid = SECINITSID_UNLABELED;
194 isec->sclass = SECCLASS_FILE;
195 isec->task_sid = tsec->sid;
196 inode->i_security = isec;
197
198 return 0;
199 }
200
201 static void inode_free_security(struct inode *inode)
202 {
203 struct inode_security_struct *isec = inode->i_security;
204 struct superblock_security_struct *sbsec = inode->i_sb->s_security;
205
206 spin_lock(&sbsec->isec_lock);
207 if (!list_empty(&isec->list))
208 list_del_init(&isec->list);
209 spin_unlock(&sbsec->isec_lock);
210
211 inode->i_security = NULL;
212 kmem_cache_free(sel_inode_cache, isec);
213 }
214
215 static int file_alloc_security(struct file *file)
216 {
217 struct task_security_struct *tsec = current->security;
218 struct file_security_struct *fsec;
219
220 fsec = kzalloc(sizeof(struct file_security_struct), GFP_KERNEL);
221 if (!fsec)
222 return -ENOMEM;
223
224 fsec->sid = tsec->sid;
225 fsec->fown_sid = tsec->sid;
226 file->f_security = fsec;
227
228 return 0;
229 }
230
231 static void file_free_security(struct file *file)
232 {
233 struct file_security_struct *fsec = file->f_security;
234 file->f_security = NULL;
235 kfree(fsec);
236 }
237
238 static int superblock_alloc_security(struct super_block *sb)
239 {
240 struct superblock_security_struct *sbsec;
241
242 sbsec = kzalloc(sizeof(struct superblock_security_struct), GFP_KERNEL);
243 if (!sbsec)
244 return -ENOMEM;
245
246 mutex_init(&sbsec->lock);
247 INIT_LIST_HEAD(&sbsec->list);
248 INIT_LIST_HEAD(&sbsec->isec_head);
249 spin_lock_init(&sbsec->isec_lock);
250 sbsec->sb = sb;
251 sbsec->sid = SECINITSID_UNLABELED;
252 sbsec->def_sid = SECINITSID_FILE;
253 sbsec->mntpoint_sid = SECINITSID_UNLABELED;
254 sb->s_security = sbsec;
255
256 return 0;
257 }
258
259 static void superblock_free_security(struct super_block *sb)
260 {
261 struct superblock_security_struct *sbsec = sb->s_security;
262
263 spin_lock(&sb_security_lock);
264 if (!list_empty(&sbsec->list))
265 list_del_init(&sbsec->list);
266 spin_unlock(&sb_security_lock);
267
268 sb->s_security = NULL;
269 kfree(sbsec);
270 }
271
272 static int sk_alloc_security(struct sock *sk, int family, gfp_t priority)
273 {
274 struct sk_security_struct *ssec;
275
276 ssec = kzalloc(sizeof(*ssec), priority);
277 if (!ssec)
278 return -ENOMEM;
279
280 ssec->peer_sid = SECINITSID_UNLABELED;
281 ssec->sid = SECINITSID_UNLABELED;
282 sk->sk_security = ssec;
283
284 selinux_netlbl_sk_security_reset(ssec, family);
285
286 return 0;
287 }
288
289 static void sk_free_security(struct sock *sk)
290 {
291 struct sk_security_struct *ssec = sk->sk_security;
292
293 sk->sk_security = NULL;
294 kfree(ssec);
295 }
296
297 /* The security server must be initialized before
298 any labeling or access decisions can be provided. */
299 extern int ss_initialized;
300
301 /* The file system's label must be initialized prior to use. */
302
303 static char *labeling_behaviors[6] = {
304 "uses xattr",
305 "uses transition SIDs",
306 "uses task SIDs",
307 "uses genfs_contexts",
308 "not configured for labeling",
309 "uses mountpoint labeling",
310 };
311
312 static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry);
313
314 static inline int inode_doinit(struct inode *inode)
315 {
316 return inode_doinit_with_dentry(inode, NULL);
317 }
318
319 enum {
320 Opt_error = -1,
321 Opt_context = 1,
322 Opt_fscontext = 2,
323 Opt_defcontext = 3,
324 Opt_rootcontext = 4,
325 };
326
327 static match_table_t tokens = {
328 {Opt_context, CONTEXT_STR "%s"},
329 {Opt_fscontext, FSCONTEXT_STR "%s"},
330 {Opt_defcontext, DEFCONTEXT_STR "%s"},
331 {Opt_rootcontext, ROOTCONTEXT_STR "%s"},
332 {Opt_error, NULL},
333 };
334
335 #define SEL_MOUNT_FAIL_MSG "SELinux: duplicate or incompatible mount options\n"
336
337 static int may_context_mount_sb_relabel(u32 sid,
338 struct superblock_security_struct *sbsec,
339 struct task_security_struct *tsec)
340 {
341 int rc;
342
343 rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM,
344 FILESYSTEM__RELABELFROM, NULL);
345 if (rc)
346 return rc;
347
348 rc = avc_has_perm(tsec->sid, sid, SECCLASS_FILESYSTEM,
349 FILESYSTEM__RELABELTO, NULL);
350 return rc;
351 }
352
353 static int may_context_mount_inode_relabel(u32 sid,
354 struct superblock_security_struct *sbsec,
355 struct task_security_struct *tsec)
356 {
357 int rc;
358 rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM,
359 FILESYSTEM__RELABELFROM, NULL);
360 if (rc)
361 return rc;
362
363 rc = avc_has_perm(sid, sbsec->sid, SECCLASS_FILESYSTEM,
364 FILESYSTEM__ASSOCIATE, NULL);
365 return rc;
366 }
367
368 static int sb_finish_set_opts(struct super_block *sb)
369 {
370 struct superblock_security_struct *sbsec = sb->s_security;
371 struct dentry *root = sb->s_root;
372 struct inode *root_inode = root->d_inode;
373 int rc = 0;
374
375 if (sbsec->behavior == SECURITY_FS_USE_XATTR) {
376 /* Make sure that the xattr handler exists and that no
377 error other than -ENODATA is returned by getxattr on
378 the root directory. -ENODATA is ok, as this may be
379 the first boot of the SELinux kernel before we have
380 assigned xattr values to the filesystem. */
381 if (!root_inode->i_op->getxattr) {
382 printk(KERN_WARNING "SELinux: (dev %s, type %s) has no "
383 "xattr support\n", sb->s_id, sb->s_type->name);
384 rc = -EOPNOTSUPP;
385 goto out;
386 }
387 rc = root_inode->i_op->getxattr(root, XATTR_NAME_SELINUX, NULL, 0);
388 if (rc < 0 && rc != -ENODATA) {
389 if (rc == -EOPNOTSUPP)
390 printk(KERN_WARNING "SELinux: (dev %s, type "
391 "%s) has no security xattr handler\n",
392 sb->s_id, sb->s_type->name);
393 else
394 printk(KERN_WARNING "SELinux: (dev %s, type "
395 "%s) getxattr errno %d\n", sb->s_id,
396 sb->s_type->name, -rc);
397 goto out;
398 }
399 }
400
401 sbsec->initialized = 1;
402
403 if (sbsec->behavior > ARRAY_SIZE(labeling_behaviors))
404 printk(KERN_ERR "SELinux: initialized (dev %s, type %s), unknown behavior\n",
405 sb->s_id, sb->s_type->name);
406 else
407 printk(KERN_DEBUG "SELinux: initialized (dev %s, type %s), %s\n",
408 sb->s_id, sb->s_type->name,
409 labeling_behaviors[sbsec->behavior-1]);
410
411 /* Initialize the root inode. */
412 rc = inode_doinit_with_dentry(root_inode, root);
413
414 /* Initialize any other inodes associated with the superblock, e.g.
415 inodes created prior to initial policy load or inodes created
416 during get_sb by a pseudo filesystem that directly
417 populates itself. */
418 spin_lock(&sbsec->isec_lock);
419 next_inode:
420 if (!list_empty(&sbsec->isec_head)) {
421 struct inode_security_struct *isec =
422 list_entry(sbsec->isec_head.next,
423 struct inode_security_struct, list);
424 struct inode *inode = isec->inode;
425 spin_unlock(&sbsec->isec_lock);
426 inode = igrab(inode);
427 if (inode) {
428 if (!IS_PRIVATE(inode))
429 inode_doinit(inode);
430 iput(inode);
431 }
432 spin_lock(&sbsec->isec_lock);
433 list_del_init(&isec->list);
434 goto next_inode;
435 }
436 spin_unlock(&sbsec->isec_lock);
437 out:
438 return rc;
439 }
440
441 /*
442 * This function should allow an FS to ask what it's mount security
443 * options were so it can use those later for submounts, displaying
444 * mount options, or whatever.
445 */
446 static int selinux_get_mnt_opts(const struct super_block *sb,
447 struct security_mnt_opts *opts)
448 {
449 int rc = 0, i;
450 struct superblock_security_struct *sbsec = sb->s_security;
451 char *context = NULL;
452 u32 len;
453 char tmp;
454
455 security_init_mnt_opts(opts);
456
457 if (!sbsec->initialized)
458 return -EINVAL;
459
460 if (!ss_initialized)
461 return -EINVAL;
462
463 /*
464 * if we ever use sbsec flags for anything other than tracking mount
465 * settings this is going to need a mask
466 */
467 tmp = sbsec->flags;
468 /* count the number of mount options for this sb */
469 for (i = 0; i < 8; i++) {
470 if (tmp & 0x01)
471 opts->num_mnt_opts++;
472 tmp >>= 1;
473 }
474
475 opts->mnt_opts = kcalloc(opts->num_mnt_opts, sizeof(char *), GFP_ATOMIC);
476 if (!opts->mnt_opts) {
477 rc = -ENOMEM;
478 goto out_free;
479 }
480
481 opts->mnt_opts_flags = kcalloc(opts->num_mnt_opts, sizeof(int), GFP_ATOMIC);
482 if (!opts->mnt_opts_flags) {
483 rc = -ENOMEM;
484 goto out_free;
485 }
486
487 i = 0;
488 if (sbsec->flags & FSCONTEXT_MNT) {
489 rc = security_sid_to_context(sbsec->sid, &context, &len);
490 if (rc)
491 goto out_free;
492 opts->mnt_opts[i] = context;
493 opts->mnt_opts_flags[i++] = FSCONTEXT_MNT;
494 }
495 if (sbsec->flags & CONTEXT_MNT) {
496 rc = security_sid_to_context(sbsec->mntpoint_sid, &context, &len);
497 if (rc)
498 goto out_free;
499 opts->mnt_opts[i] = context;
500 opts->mnt_opts_flags[i++] = CONTEXT_MNT;
501 }
502 if (sbsec->flags & DEFCONTEXT_MNT) {
503 rc = security_sid_to_context(sbsec->def_sid, &context, &len);
504 if (rc)
505 goto out_free;
506 opts->mnt_opts[i] = context;
507 opts->mnt_opts_flags[i++] = DEFCONTEXT_MNT;
508 }
509 if (sbsec->flags & ROOTCONTEXT_MNT) {
510 struct inode *root = sbsec->sb->s_root->d_inode;
511 struct inode_security_struct *isec = root->i_security;
512
513 rc = security_sid_to_context(isec->sid, &context, &len);
514 if (rc)
515 goto out_free;
516 opts->mnt_opts[i] = context;
517 opts->mnt_opts_flags[i++] = ROOTCONTEXT_MNT;
518 }
519
520 BUG_ON(i != opts->num_mnt_opts);
521
522 return 0;
523
524 out_free:
525 security_free_mnt_opts(opts);
526 return rc;
527 }
528
529 static int bad_option(struct superblock_security_struct *sbsec, char flag,
530 u32 old_sid, u32 new_sid)
531 {
532 /* check if the old mount command had the same options */
533 if (sbsec->initialized)
534 if (!(sbsec->flags & flag) ||
535 (old_sid != new_sid))
536 return 1;
537
538 /* check if we were passed the same options twice,
539 * aka someone passed context=a,context=b
540 */
541 if (!sbsec->initialized)
542 if (sbsec->flags & flag)
543 return 1;
544 return 0;
545 }
546
547 /*
548 * Allow filesystems with binary mount data to explicitly set mount point
549 * labeling information.
550 */
551 static int selinux_set_mnt_opts(struct super_block *sb,
552 struct security_mnt_opts *opts)
553 {
554 int rc = 0, i;
555 struct task_security_struct *tsec = current->security;
556 struct superblock_security_struct *sbsec = sb->s_security;
557 const char *name = sb->s_type->name;
558 struct inode *inode = sbsec->sb->s_root->d_inode;
559 struct inode_security_struct *root_isec = inode->i_security;
560 u32 fscontext_sid = 0, context_sid = 0, rootcontext_sid = 0;
561 u32 defcontext_sid = 0;
562 char **mount_options = opts->mnt_opts;
563 int *flags = opts->mnt_opts_flags;
564 int num_opts = opts->num_mnt_opts;
565
566 mutex_lock(&sbsec->lock);
567
568 if (!ss_initialized) {
569 if (!num_opts) {
570 /* Defer initialization until selinux_complete_init,
571 after the initial policy is loaded and the security
572 server is ready to handle calls. */
573 spin_lock(&sb_security_lock);
574 if (list_empty(&sbsec->list))
575 list_add(&sbsec->list, &superblock_security_head);
576 spin_unlock(&sb_security_lock);
577 goto out;
578 }
579 rc = -EINVAL;
580 printk(KERN_WARNING "SELinux: Unable to set superblock options "
581 "before the security server is initialized\n");
582 goto out;
583 }
584
585 /*
586 * Binary mount data FS will come through this function twice. Once
587 * from an explicit call and once from the generic calls from the vfs.
588 * Since the generic VFS calls will not contain any security mount data
589 * we need to skip the double mount verification.
590 *
591 * This does open a hole in which we will not notice if the first
592 * mount using this sb set explict options and a second mount using
593 * this sb does not set any security options. (The first options
594 * will be used for both mounts)
595 */
596 if (sbsec->initialized && (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA)
597 && (num_opts == 0))
598 goto out;
599
600 /*
601 * parse the mount options, check if they are valid sids.
602 * also check if someone is trying to mount the same sb more
603 * than once with different security options.
604 */
605 for (i = 0; i < num_opts; i++) {
606 u32 sid;
607 rc = security_context_to_sid(mount_options[i],
608 strlen(mount_options[i]), &sid);
609 if (rc) {
610 printk(KERN_WARNING "SELinux: security_context_to_sid"
611 "(%s) failed for (dev %s, type %s) errno=%d\n",
612 mount_options[i], sb->s_id, name, rc);
613 goto out;
614 }
615 switch (flags[i]) {
616 case FSCONTEXT_MNT:
617 fscontext_sid = sid;
618
619 if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid,
620 fscontext_sid))
621 goto out_double_mount;
622
623 sbsec->flags |= FSCONTEXT_MNT;
624 break;
625 case CONTEXT_MNT:
626 context_sid = sid;
627
628 if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid,
629 context_sid))
630 goto out_double_mount;
631
632 sbsec->flags |= CONTEXT_MNT;
633 break;
634 case ROOTCONTEXT_MNT:
635 rootcontext_sid = sid;
636
637 if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid,
638 rootcontext_sid))
639 goto out_double_mount;
640
641 sbsec->flags |= ROOTCONTEXT_MNT;
642
643 break;
644 case DEFCONTEXT_MNT:
645 defcontext_sid = sid;
646
647 if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid,
648 defcontext_sid))
649 goto out_double_mount;
650
651 sbsec->flags |= DEFCONTEXT_MNT;
652
653 break;
654 default:
655 rc = -EINVAL;
656 goto out;
657 }
658 }
659
660 if (sbsec->initialized) {
661 /* previously mounted with options, but not on this attempt? */
662 if (sbsec->flags && !num_opts)
663 goto out_double_mount;
664 rc = 0;
665 goto out;
666 }
667
668 if (strcmp(sb->s_type->name, "proc") == 0)
669 sbsec->proc = 1;
670
671 /* Determine the labeling behavior to use for this filesystem type. */
672 rc = security_fs_use(sb->s_type->name, &sbsec->behavior, &sbsec->sid);
673 if (rc) {
674 printk(KERN_WARNING "%s: security_fs_use(%s) returned %d\n",
675 __func__, sb->s_type->name, rc);
676 goto out;
677 }
678
679 /* sets the context of the superblock for the fs being mounted. */
680 if (fscontext_sid) {
681
682 rc = may_context_mount_sb_relabel(fscontext_sid, sbsec, tsec);
683 if (rc)
684 goto out;
685
686 sbsec->sid = fscontext_sid;
687 }
688
689 /*
690 * Switch to using mount point labeling behavior.
691 * sets the label used on all file below the mountpoint, and will set
692 * the superblock context if not already set.
693 */
694 if (context_sid) {
695 if (!fscontext_sid) {
696 rc = may_context_mount_sb_relabel(context_sid, sbsec, tsec);
697 if (rc)
698 goto out;
699 sbsec->sid = context_sid;
700 } else {
701 rc = may_context_mount_inode_relabel(context_sid, sbsec, tsec);
702 if (rc)
703 goto out;
704 }
705 if (!rootcontext_sid)
706 rootcontext_sid = context_sid;
707
708 sbsec->mntpoint_sid = context_sid;
709 sbsec->behavior = SECURITY_FS_USE_MNTPOINT;
710 }
711
712 if (rootcontext_sid) {
713 rc = may_context_mount_inode_relabel(rootcontext_sid, sbsec, tsec);
714 if (rc)
715 goto out;
716
717 root_isec->sid = rootcontext_sid;
718 root_isec->initialized = 1;
719 }
720
721 if (defcontext_sid) {
722 if (sbsec->behavior != SECURITY_FS_USE_XATTR) {
723 rc = -EINVAL;
724 printk(KERN_WARNING "SELinux: defcontext option is "
725 "invalid for this filesystem type\n");
726 goto out;
727 }
728
729 if (defcontext_sid != sbsec->def_sid) {
730 rc = may_context_mount_inode_relabel(defcontext_sid,
731 sbsec, tsec);
732 if (rc)
733 goto out;
734 }
735
736 sbsec->def_sid = defcontext_sid;
737 }
738
739 rc = sb_finish_set_opts(sb);
740 out:
741 mutex_unlock(&sbsec->lock);
742 return rc;
743 out_double_mount:
744 rc = -EINVAL;
745 printk(KERN_WARNING "SELinux: mount invalid. Same superblock, different "
746 "security settings for (dev %s, type %s)\n", sb->s_id, name);
747 goto out;
748 }
749
750 static void selinux_sb_clone_mnt_opts(const struct super_block *oldsb,
751 struct super_block *newsb)
752 {
753 const struct superblock_security_struct *oldsbsec = oldsb->s_security;
754 struct superblock_security_struct *newsbsec = newsb->s_security;
755
756 int set_fscontext = (oldsbsec->flags & FSCONTEXT_MNT);
757 int set_context = (oldsbsec->flags & CONTEXT_MNT);
758 int set_rootcontext = (oldsbsec->flags & ROOTCONTEXT_MNT);
759
760 /*
761 * if the parent was able to be mounted it clearly had no special lsm
762 * mount options. thus we can safely put this sb on the list and deal
763 * with it later
764 */
765 if (!ss_initialized) {
766 spin_lock(&sb_security_lock);
767 if (list_empty(&newsbsec->list))
768 list_add(&newsbsec->list, &superblock_security_head);
769 spin_unlock(&sb_security_lock);
770 return;
771 }
772
773 /* how can we clone if the old one wasn't set up?? */
774 BUG_ON(!oldsbsec->initialized);
775
776 /* if fs is reusing a sb, just let its options stand... */
777 if (newsbsec->initialized)
778 return;
779
780 mutex_lock(&newsbsec->lock);
781
782 newsbsec->flags = oldsbsec->flags;
783
784 newsbsec->sid = oldsbsec->sid;
785 newsbsec->def_sid = oldsbsec->def_sid;
786 newsbsec->behavior = oldsbsec->behavior;
787
788 if (set_context) {
789 u32 sid = oldsbsec->mntpoint_sid;
790
791 if (!set_fscontext)
792 newsbsec->sid = sid;
793 if (!set_rootcontext) {
794 struct inode *newinode = newsb->s_root->d_inode;
795 struct inode_security_struct *newisec = newinode->i_security;
796 newisec->sid = sid;
797 }
798 newsbsec->mntpoint_sid = sid;
799 }
800 if (set_rootcontext) {
801 const struct inode *oldinode = oldsb->s_root->d_inode;
802 const struct inode_security_struct *oldisec = oldinode->i_security;
803 struct inode *newinode = newsb->s_root->d_inode;
804 struct inode_security_struct *newisec = newinode->i_security;
805
806 newisec->sid = oldisec->sid;
807 }
808
809 sb_finish_set_opts(newsb);
810 mutex_unlock(&newsbsec->lock);
811 }
812
813 static int selinux_parse_opts_str(char *options,
814 struct security_mnt_opts *opts)
815 {
816 char *p;
817 char *context = NULL, *defcontext = NULL;
818 char *fscontext = NULL, *rootcontext = NULL;
819 int rc, num_mnt_opts = 0;
820
821 opts->num_mnt_opts = 0;
822
823 /* Standard string-based options. */
824 while ((p = strsep(&options, "|")) != NULL) {
825 int token;
826 substring_t args[MAX_OPT_ARGS];
827
828 if (!*p)
829 continue;
830
831 token = match_token(p, tokens, args);
832
833 switch (token) {
834 case Opt_context:
835 if (context || defcontext) {
836 rc = -EINVAL;
837 printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
838 goto out_err;
839 }
840 context = match_strdup(&args[0]);
841 if (!context) {
842 rc = -ENOMEM;
843 goto out_err;
844 }
845 break;
846
847 case Opt_fscontext:
848 if (fscontext) {
849 rc = -EINVAL;
850 printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
851 goto out_err;
852 }
853 fscontext = match_strdup(&args[0]);
854 if (!fscontext) {
855 rc = -ENOMEM;
856 goto out_err;
857 }
858 break;
859
860 case Opt_rootcontext:
861 if (rootcontext) {
862 rc = -EINVAL;
863 printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
864 goto out_err;
865 }
866 rootcontext = match_strdup(&args[0]);
867 if (!rootcontext) {
868 rc = -ENOMEM;
869 goto out_err;
870 }
871 break;
872
873 case Opt_defcontext:
874 if (context || defcontext) {
875 rc = -EINVAL;
876 printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
877 goto out_err;
878 }
879 defcontext = match_strdup(&args[0]);
880 if (!defcontext) {
881 rc = -ENOMEM;
882 goto out_err;
883 }
884 break;
885
886 default:
887 rc = -EINVAL;
888 printk(KERN_WARNING "SELinux: unknown mount option\n");
889 goto out_err;
890
891 }
892 }
893
894 rc = -ENOMEM;
895 opts->mnt_opts = kcalloc(NUM_SEL_MNT_OPTS, sizeof(char *), GFP_ATOMIC);
896 if (!opts->mnt_opts)
897 goto out_err;
898
899 opts->mnt_opts_flags = kcalloc(NUM_SEL_MNT_OPTS, sizeof(int), GFP_ATOMIC);
900 if (!opts->mnt_opts_flags) {
901 kfree(opts->mnt_opts);
902 goto out_err;
903 }
904
905 if (fscontext) {
906 opts->mnt_opts[num_mnt_opts] = fscontext;
907 opts->mnt_opts_flags[num_mnt_opts++] = FSCONTEXT_MNT;
908 }
909 if (context) {
910 opts->mnt_opts[num_mnt_opts] = context;
911 opts->mnt_opts_flags[num_mnt_opts++] = CONTEXT_MNT;
912 }
913 if (rootcontext) {
914 opts->mnt_opts[num_mnt_opts] = rootcontext;
915 opts->mnt_opts_flags[num_mnt_opts++] = ROOTCONTEXT_MNT;
916 }
917 if (defcontext) {
918 opts->mnt_opts[num_mnt_opts] = defcontext;
919 opts->mnt_opts_flags[num_mnt_opts++] = DEFCONTEXT_MNT;
920 }
921
922 opts->num_mnt_opts = num_mnt_opts;
923 return 0;
924
925 out_err:
926 kfree(context);
927 kfree(defcontext);
928 kfree(fscontext);
929 kfree(rootcontext);
930 return rc;
931 }
932 /*
933 * string mount options parsing and call set the sbsec
934 */
935 static int superblock_doinit(struct super_block *sb, void *data)
936 {
937 int rc = 0;
938 char *options = data;
939 struct security_mnt_opts opts;
940
941 security_init_mnt_opts(&opts);
942
943 if (!data)
944 goto out;
945
946 BUG_ON(sb->s_type->fs_flags & FS_BINARY_MOUNTDATA);
947
948 rc = selinux_parse_opts_str(options, &opts);
949 if (rc)
950 goto out_err;
951
952 out:
953 rc = selinux_set_mnt_opts(sb, &opts);
954
955 out_err:
956 security_free_mnt_opts(&opts);
957 return rc;
958 }
959
960 void selinux_write_opts(struct seq_file *m, struct security_mnt_opts *opts)
961 {
962 int i;
963 char *prefix;
964
965 for (i = 0; i < opts->num_mnt_opts; i++) {
966 char *has_comma = strchr(opts->mnt_opts[i], ',');
967
968 switch (opts->mnt_opts_flags[i]) {
969 case CONTEXT_MNT:
970 prefix = CONTEXT_STR;
971 break;
972 case FSCONTEXT_MNT:
973 prefix = FSCONTEXT_STR;
974 break;
975 case ROOTCONTEXT_MNT:
976 prefix = ROOTCONTEXT_STR;
977 break;
978 case DEFCONTEXT_MNT:
979 prefix = DEFCONTEXT_STR;
980 break;
981 default:
982 BUG();
983 };
984 /* we need a comma before each option */
985 seq_putc(m, ',');
986 seq_puts(m, prefix);
987 if (has_comma)
988 seq_putc(m, '\"');
989 seq_puts(m, opts->mnt_opts[i]);
990 if (has_comma)
991 seq_putc(m, '\"');
992 }
993 }
994
995 static int selinux_sb_show_options(struct seq_file *m, struct super_block *sb)
996 {
997 struct security_mnt_opts opts;
998 int rc;
999
1000 rc = selinux_get_mnt_opts(sb, &opts);
1001 if (rc) {
1002 /* before policy load we may get EINVAL, don't show anything */
1003 if (rc == -EINVAL)
1004 rc = 0;
1005 return rc;
1006 }
1007
1008 selinux_write_opts(m, &opts);
1009
1010 security_free_mnt_opts(&opts);
1011
1012 return rc;
1013 }
1014
1015 static inline u16 inode_mode_to_security_class(umode_t mode)
1016 {
1017 switch (mode & S_IFMT) {
1018 case S_IFSOCK:
1019 return SECCLASS_SOCK_FILE;
1020 case S_IFLNK:
1021 return SECCLASS_LNK_FILE;
1022 case S_IFREG:
1023 return SECCLASS_FILE;
1024 case S_IFBLK:
1025 return SECCLASS_BLK_FILE;
1026 case S_IFDIR:
1027 return SECCLASS_DIR;
1028 case S_IFCHR:
1029 return SECCLASS_CHR_FILE;
1030 case S_IFIFO:
1031 return SECCLASS_FIFO_FILE;
1032
1033 }
1034
1035 return SECCLASS_FILE;
1036 }
1037
1038 static inline int default_protocol_stream(int protocol)
1039 {
1040 return (protocol == IPPROTO_IP || protocol == IPPROTO_TCP);
1041 }
1042
1043 static inline int default_protocol_dgram(int protocol)
1044 {
1045 return (protocol == IPPROTO_IP || protocol == IPPROTO_UDP);
1046 }
1047
1048 static inline u16 socket_type_to_security_class(int family, int type, int protocol)
1049 {
1050 switch (family) {
1051 case PF_UNIX:
1052 switch (type) {
1053 case SOCK_STREAM:
1054 case SOCK_SEQPACKET:
1055 return SECCLASS_UNIX_STREAM_SOCKET;
1056 case SOCK_DGRAM:
1057 return SECCLASS_UNIX_DGRAM_SOCKET;
1058 }
1059 break;
1060 case PF_INET:
1061 case PF_INET6:
1062 switch (type) {
1063 case SOCK_STREAM:
1064 if (default_protocol_stream(protocol))
1065 return SECCLASS_TCP_SOCKET;
1066 else
1067 return SECCLASS_RAWIP_SOCKET;
1068 case SOCK_DGRAM:
1069 if (default_protocol_dgram(protocol))
1070 return SECCLASS_UDP_SOCKET;
1071 else
1072 return SECCLASS_RAWIP_SOCKET;
1073 case SOCK_DCCP:
1074 return SECCLASS_DCCP_SOCKET;
1075 default:
1076 return SECCLASS_RAWIP_SOCKET;
1077 }
1078 break;
1079 case PF_NETLINK:
1080 switch (protocol) {
1081 case NETLINK_ROUTE:
1082 return SECCLASS_NETLINK_ROUTE_SOCKET;
1083 case NETLINK_FIREWALL:
1084 return SECCLASS_NETLINK_FIREWALL_SOCKET;
1085 case NETLINK_INET_DIAG:
1086 return SECCLASS_NETLINK_TCPDIAG_SOCKET;
1087 case NETLINK_NFLOG:
1088 return SECCLASS_NETLINK_NFLOG_SOCKET;
1089 case NETLINK_XFRM:
1090 return SECCLASS_NETLINK_XFRM_SOCKET;
1091 case NETLINK_SELINUX:
1092 return SECCLASS_NETLINK_SELINUX_SOCKET;
1093 case NETLINK_AUDIT:
1094 return SECCLASS_NETLINK_AUDIT_SOCKET;
1095 case NETLINK_IP6_FW:
1096 return SECCLASS_NETLINK_IP6FW_SOCKET;
1097 case NETLINK_DNRTMSG:
1098 return SECCLASS_NETLINK_DNRT_SOCKET;
1099 case NETLINK_KOBJECT_UEVENT:
1100 return SECCLASS_NETLINK_KOBJECT_UEVENT_SOCKET;
1101 default:
1102 return SECCLASS_NETLINK_SOCKET;
1103 }
1104 case PF_PACKET:
1105 return SECCLASS_PACKET_SOCKET;
1106 case PF_KEY:
1107 return SECCLASS_KEY_SOCKET;
1108 case PF_APPLETALK:
1109 return SECCLASS_APPLETALK_SOCKET;
1110 }
1111
1112 return SECCLASS_SOCKET;
1113 }
1114
1115 #ifdef CONFIG_PROC_FS
1116 static int selinux_proc_get_sid(struct proc_dir_entry *de,
1117 u16 tclass,
1118 u32 *sid)
1119 {
1120 int buflen, rc;
1121 char *buffer, *path, *end;
1122
1123 buffer = (char *)__get_free_page(GFP_KERNEL);
1124 if (!buffer)
1125 return -ENOMEM;
1126
1127 buflen = PAGE_SIZE;
1128 end = buffer+buflen;
1129 *--end = '\0';
1130 buflen--;
1131 path = end-1;
1132 *path = '/';
1133 while (de && de != de->parent) {
1134 buflen -= de->namelen + 1;
1135 if (buflen < 0)
1136 break;
1137 end -= de->namelen;
1138 memcpy(end, de->name, de->namelen);
1139 *--end = '/';
1140 path = end;
1141 de = de->parent;
1142 }
1143 rc = security_genfs_sid("proc", path, tclass, sid);
1144 free_page((unsigned long)buffer);
1145 return rc;
1146 }
1147 #else
1148 static int selinux_proc_get_sid(struct proc_dir_entry *de,
1149 u16 tclass,
1150 u32 *sid)
1151 {
1152 return -EINVAL;
1153 }
1154 #endif
1155
1156 /* The inode's security attributes must be initialized before first use. */
1157 static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry)
1158 {
1159 struct superblock_security_struct *sbsec = NULL;
1160 struct inode_security_struct *isec = inode->i_security;
1161 u32 sid;
1162 struct dentry *dentry;
1163 #define INITCONTEXTLEN 255
1164 char *context = NULL;
1165 unsigned len = 0;
1166 int rc = 0;
1167
1168 if (isec->initialized)
1169 goto out;
1170
1171 mutex_lock(&isec->lock);
1172 if (isec->initialized)
1173 goto out_unlock;
1174
1175 sbsec = inode->i_sb->s_security;
1176 if (!sbsec->initialized) {
1177 /* Defer initialization until selinux_complete_init,
1178 after the initial policy is loaded and the security
1179 server is ready to handle calls. */
1180 spin_lock(&sbsec->isec_lock);
1181 if (list_empty(&isec->list))
1182 list_add(&isec->list, &sbsec->isec_head);
1183 spin_unlock(&sbsec->isec_lock);
1184 goto out_unlock;
1185 }
1186
1187 switch (sbsec->behavior) {
1188 case SECURITY_FS_USE_XATTR:
1189 if (!inode->i_op->getxattr) {
1190 isec->sid = sbsec->def_sid;
1191 break;
1192 }
1193
1194 /* Need a dentry, since the xattr API requires one.
1195 Life would be simpler if we could just pass the inode. */
1196 if (opt_dentry) {
1197 /* Called from d_instantiate or d_splice_alias. */
1198 dentry = dget(opt_dentry);
1199 } else {
1200 /* Called from selinux_complete_init, try to find a dentry. */
1201 dentry = d_find_alias(inode);
1202 }
1203 if (!dentry) {
1204 printk(KERN_WARNING "SELinux: %s: no dentry for dev=%s "
1205 "ino=%ld\n", __func__, inode->i_sb->s_id,
1206 inode->i_ino);
1207 goto out_unlock;
1208 }
1209
1210 len = INITCONTEXTLEN;
1211 context = kmalloc(len, GFP_NOFS);
1212 if (!context) {
1213 rc = -ENOMEM;
1214 dput(dentry);
1215 goto out_unlock;
1216 }
1217 rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX,
1218 context, len);
1219 if (rc == -ERANGE) {
1220 /* Need a larger buffer. Query for the right size. */
1221 rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX,
1222 NULL, 0);
1223 if (rc < 0) {
1224 dput(dentry);
1225 goto out_unlock;
1226 }
1227 kfree(context);
1228 len = rc;
1229 context = kmalloc(len, GFP_NOFS);
1230 if (!context) {
1231 rc = -ENOMEM;
1232 dput(dentry);
1233 goto out_unlock;
1234 }
1235 rc = inode->i_op->getxattr(dentry,
1236 XATTR_NAME_SELINUX,
1237 context, len);
1238 }
1239 dput(dentry);
1240 if (rc < 0) {
1241 if (rc != -ENODATA) {
1242 printk(KERN_WARNING "SELinux: %s: getxattr returned "
1243 "%d for dev=%s ino=%ld\n", __func__,
1244 -rc, inode->i_sb->s_id, inode->i_ino);
1245 kfree(context);
1246 goto out_unlock;
1247 }
1248 /* Map ENODATA to the default file SID */
1249 sid = sbsec->def_sid;
1250 rc = 0;
1251 } else {
1252 rc = security_context_to_sid_default(context, rc, &sid,
1253 sbsec->def_sid,
1254 GFP_NOFS);
1255 if (rc) {
1256 printk(KERN_WARNING "SELinux: %s: context_to_sid(%s) "
1257 "returned %d for dev=%s ino=%ld\n",
1258 __func__, context, -rc,
1259 inode->i_sb->s_id, inode->i_ino);
1260 kfree(context);
1261 /* Leave with the unlabeled SID */
1262 rc = 0;
1263 break;
1264 }
1265 }
1266 kfree(context);
1267 isec->sid = sid;
1268 break;
1269 case SECURITY_FS_USE_TASK:
1270 isec->sid = isec->task_sid;
1271 break;
1272 case SECURITY_FS_USE_TRANS:
1273 /* Default to the fs SID. */
1274 isec->sid = sbsec->sid;
1275
1276 /* Try to obtain a transition SID. */
1277 isec->sclass = inode_mode_to_security_class(inode->i_mode);
1278 rc = security_transition_sid(isec->task_sid,
1279 sbsec->sid,
1280 isec->sclass,
1281 &sid);
1282 if (rc)
1283 goto out_unlock;
1284 isec->sid = sid;
1285 break;
1286 case SECURITY_FS_USE_MNTPOINT:
1287 isec->sid = sbsec->mntpoint_sid;
1288 break;
1289 default:
1290 /* Default to the fs superblock SID. */
1291 isec->sid = sbsec->sid;
1292
1293 if (sbsec->proc) {
1294 struct proc_inode *proci = PROC_I(inode);
1295 if (proci->pde) {
1296 isec->sclass = inode_mode_to_security_class(inode->i_mode);
1297 rc = selinux_proc_get_sid(proci->pde,
1298 isec->sclass,
1299 &sid);
1300 if (rc)
1301 goto out_unlock;
1302 isec->sid = sid;
1303 }
1304 }
1305 break;
1306 }
1307
1308 isec->initialized = 1;
1309
1310 out_unlock:
1311 mutex_unlock(&isec->lock);
1312 out:
1313 if (isec->sclass == SECCLASS_FILE)
1314 isec->sclass = inode_mode_to_security_class(inode->i_mode);
1315 return rc;
1316 }
1317
1318 /* Convert a Linux signal to an access vector. */
1319 static inline u32 signal_to_av(int sig)
1320 {
1321 u32 perm = 0;
1322
1323 switch (sig) {
1324 case SIGCHLD:
1325 /* Commonly granted from child to parent. */
1326 perm = PROCESS__SIGCHLD;
1327 break;
1328 case SIGKILL:
1329 /* Cannot be caught or ignored */
1330 perm = PROCESS__SIGKILL;
1331 break;
1332 case SIGSTOP:
1333 /* Cannot be caught or ignored */
1334 perm = PROCESS__SIGSTOP;
1335 break;
1336 default:
1337 /* All other signals. */
1338 perm = PROCESS__SIGNAL;
1339 break;
1340 }
1341
1342 return perm;
1343 }
1344
1345 /* Check permission betweeen a pair of tasks, e.g. signal checks,
1346 fork check, ptrace check, etc. */
1347 static int task_has_perm(struct task_struct *tsk1,
1348 struct task_struct *tsk2,
1349 u32 perms)
1350 {
1351 struct task_security_struct *tsec1, *tsec2;
1352
1353 tsec1 = tsk1->security;
1354 tsec2 = tsk2->security;
1355 return avc_has_perm(tsec1->sid, tsec2->sid,
1356 SECCLASS_PROCESS, perms, NULL);
1357 }
1358
1359 #if CAP_LAST_CAP > 63
1360 #error Fix SELinux to handle capabilities > 63.
1361 #endif
1362
1363 /* Check whether a task is allowed to use a capability. */
1364 static int task_has_capability(struct task_struct *tsk,
1365 int cap)
1366 {
1367 struct task_security_struct *tsec;
1368 struct avc_audit_data ad;
1369 u16 sclass;
1370 u32 av = CAP_TO_MASK(cap);
1371
1372 tsec = tsk->security;
1373
1374 AVC_AUDIT_DATA_INIT(&ad, CAP);
1375 ad.tsk = tsk;
1376 ad.u.cap = cap;
1377
1378 switch (CAP_TO_INDEX(cap)) {
1379 case 0:
1380 sclass = SECCLASS_CAPABILITY;
1381 break;
1382 case 1:
1383 sclass = SECCLASS_CAPABILITY2;
1384 break;
1385 default:
1386 printk(KERN_ERR
1387 "SELinux: out of range capability %d\n", cap);
1388 BUG();
1389 }
1390 return avc_has_perm(tsec->sid, tsec->sid, sclass, av, &ad);
1391 }
1392
1393 /* Check whether a task is allowed to use a system operation. */
1394 static int task_has_system(struct task_struct *tsk,
1395 u32 perms)
1396 {
1397 struct task_security_struct *tsec;
1398
1399 tsec = tsk->security;
1400
1401 return avc_has_perm(tsec->sid, SECINITSID_KERNEL,
1402 SECCLASS_SYSTEM, perms, NULL);
1403 }
1404
1405 /* Check whether a task has a particular permission to an inode.
1406 The 'adp' parameter is optional and allows other audit
1407 data to be passed (e.g. the dentry). */
1408 static int inode_has_perm(struct task_struct *tsk,
1409 struct inode *inode,
1410 u32 perms,
1411 struct avc_audit_data *adp)
1412 {
1413 struct task_security_struct *tsec;
1414 struct inode_security_struct *isec;
1415 struct avc_audit_data ad;
1416
1417 if (unlikely(IS_PRIVATE(inode)))
1418 return 0;
1419
1420 tsec = tsk->security;
1421 isec = inode->i_security;
1422
1423 if (!adp) {
1424 adp = &ad;
1425 AVC_AUDIT_DATA_INIT(&ad, FS);
1426 ad.u.fs.inode = inode;
1427 }
1428
1429 return avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, adp);
1430 }
1431
1432 /* Same as inode_has_perm, but pass explicit audit data containing
1433 the dentry to help the auditing code to more easily generate the
1434 pathname if needed. */
1435 static inline int dentry_has_perm(struct task_struct *tsk,
1436 struct vfsmount *mnt,
1437 struct dentry *dentry,
1438 u32 av)
1439 {
1440 struct inode *inode = dentry->d_inode;
1441 struct avc_audit_data ad;
1442 AVC_AUDIT_DATA_INIT(&ad, FS);
1443 ad.u.fs.path.mnt = mnt;
1444 ad.u.fs.path.dentry = dentry;
1445 return inode_has_perm(tsk, inode, av, &ad);
1446 }
1447
1448 /* Check whether a task can use an open file descriptor to
1449 access an inode in a given way. Check access to the
1450 descriptor itself, and then use dentry_has_perm to
1451 check a particular permission to the file.
1452 Access to the descriptor is implicitly granted if it
1453 has the same SID as the process. If av is zero, then
1454 access to the file is not checked, e.g. for cases
1455 where only the descriptor is affected like seek. */
1456 static int file_has_perm(struct task_struct *tsk,
1457 struct file *file,
1458 u32 av)
1459 {
1460 struct task_security_struct *tsec = tsk->security;
1461 struct file_security_struct *fsec = file->f_security;
1462 struct inode *inode = file->f_path.dentry->d_inode;
1463 struct avc_audit_data ad;
1464 int rc;
1465
1466 AVC_AUDIT_DATA_INIT(&ad, FS);
1467 ad.u.fs.path = file->f_path;
1468
1469 if (tsec->sid != fsec->sid) {
1470 rc = avc_has_perm(tsec->sid, fsec->sid,
1471 SECCLASS_FD,
1472 FD__USE,
1473 &ad);
1474 if (rc)
1475 return rc;
1476 }
1477
1478 /* av is zero if only checking access to the descriptor. */
1479 if (av)
1480 return inode_has_perm(tsk, inode, av, &ad);
1481
1482 return 0;
1483 }
1484
1485 /* Check whether a task can create a file. */
1486 static int may_create(struct inode *dir,
1487 struct dentry *dentry,
1488 u16 tclass)
1489 {
1490 struct task_security_struct *tsec;
1491 struct inode_security_struct *dsec;
1492 struct superblock_security_struct *sbsec;
1493 u32 newsid;
1494 struct avc_audit_data ad;
1495 int rc;
1496
1497 tsec = current->security;
1498 dsec = dir->i_security;
1499 sbsec = dir->i_sb->s_security;
1500
1501 AVC_AUDIT_DATA_INIT(&ad, FS);
1502 ad.u.fs.path.dentry = dentry;
1503
1504 rc = avc_has_perm(tsec->sid, dsec->sid, SECCLASS_DIR,
1505 DIR__ADD_NAME | DIR__SEARCH,
1506 &ad);
1507 if (rc)
1508 return rc;
1509
1510 if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) {
1511 newsid = tsec->create_sid;
1512 } else {
1513 rc = security_transition_sid(tsec->sid, dsec->sid, tclass,
1514 &newsid);
1515 if (rc)
1516 return rc;
1517 }
1518
1519 rc = avc_has_perm(tsec->sid, newsid, tclass, FILE__CREATE, &ad);
1520 if (rc)
1521 return rc;
1522
1523 return avc_has_perm(newsid, sbsec->sid,
1524 SECCLASS_FILESYSTEM,
1525 FILESYSTEM__ASSOCIATE, &ad);
1526 }
1527
1528 /* Check whether a task can create a key. */
1529 static int may_create_key(u32 ksid,
1530 struct task_struct *ctx)
1531 {
1532 struct task_security_struct *tsec;
1533
1534 tsec = ctx->security;
1535
1536 return avc_has_perm(tsec->sid, ksid, SECCLASS_KEY, KEY__CREATE, NULL);
1537 }
1538
1539 #define MAY_LINK 0
1540 #define MAY_UNLINK 1
1541 #define MAY_RMDIR 2
1542
1543 /* Check whether a task can link, unlink, or rmdir a file/directory. */
1544 static int may_link(struct inode *dir,
1545 struct dentry *dentry,
1546 int kind)
1547
1548 {
1549 struct task_security_struct *tsec;
1550 struct inode_security_struct *dsec, *isec;
1551 struct avc_audit_data ad;
1552 u32 av;
1553 int rc;
1554
1555 tsec = current->security;
1556 dsec = dir->i_security;
1557 isec = dentry->d_inode->i_security;
1558
1559 AVC_AUDIT_DATA_INIT(&ad, FS);
1560 ad.u.fs.path.dentry = dentry;
1561
1562 av = DIR__SEARCH;
1563 av |= (kind ? DIR__REMOVE_NAME : DIR__ADD_NAME);
1564 rc = avc_has_perm(tsec->sid, dsec->sid, SECCLASS_DIR, av, &ad);
1565 if (rc)
1566 return rc;
1567
1568 switch (kind) {
1569 case MAY_LINK:
1570 av = FILE__LINK;
1571 break;
1572 case MAY_UNLINK:
1573 av = FILE__UNLINK;
1574 break;
1575 case MAY_RMDIR:
1576 av = DIR__RMDIR;
1577 break;
1578 default:
1579 printk(KERN_WARNING "SELinux: %s: unrecognized kind %d\n",
1580 __func__, kind);
1581 return 0;
1582 }
1583
1584 rc = avc_has_perm(tsec->sid, isec->sid, isec->sclass, av, &ad);
1585 return rc;
1586 }
1587
1588 static inline int may_rename(struct inode *old_dir,
1589 struct dentry *old_dentry,
1590 struct inode *new_dir,
1591 struct dentry *new_dentry)
1592 {
1593 struct task_security_struct *tsec;
1594 struct inode_security_struct *old_dsec, *new_dsec, *old_isec, *new_isec;
1595 struct avc_audit_data ad;
1596 u32 av;
1597 int old_is_dir, new_is_dir;
1598 int rc;
1599
1600 tsec = current->security;
1601 old_dsec = old_dir->i_security;
1602 old_isec = old_dentry->d_inode->i_security;
1603 old_is_dir = S_ISDIR(old_dentry->d_inode->i_mode);
1604 new_dsec = new_dir->i_security;
1605
1606 AVC_AUDIT_DATA_INIT(&ad, FS);
1607
1608 ad.u.fs.path.dentry = old_dentry;
1609 rc = avc_has_perm(tsec->sid, old_dsec->sid, SECCLASS_DIR,
1610 DIR__REMOVE_NAME | DIR__SEARCH, &ad);
1611 if (rc)
1612 return rc;
1613 rc = avc_has_perm(tsec->sid, old_isec->sid,
1614 old_isec->sclass, FILE__RENAME, &ad);
1615 if (rc)
1616 return rc;
1617 if (old_is_dir && new_dir != old_dir) {
1618 rc = avc_has_perm(tsec->sid, old_isec->sid,
1619 old_isec->sclass, DIR__REPARENT, &ad);
1620 if (rc)
1621 return rc;
1622 }
1623
1624 ad.u.fs.path.dentry = new_dentry;
1625 av = DIR__ADD_NAME | DIR__SEARCH;
1626 if (new_dentry->d_inode)
1627 av |= DIR__REMOVE_NAME;
1628 rc = avc_has_perm(tsec->sid, new_dsec->sid, SECCLASS_DIR, av, &ad);
1629 if (rc)
1630 return rc;
1631 if (new_dentry->d_inode) {
1632 new_isec = new_dentry->d_inode->i_security;
1633 new_is_dir = S_ISDIR(new_dentry->d_inode->i_mode);
1634 rc = avc_has_perm(tsec->sid, new_isec->sid,
1635 new_isec->sclass,
1636 (new_is_dir ? DIR__RMDIR : FILE__UNLINK), &ad);
1637 if (rc)
1638 return rc;
1639 }
1640
1641 return 0;
1642 }
1643
1644 /* Check whether a task can perform a filesystem operation. */
1645 static int superblock_has_perm(struct task_struct *tsk,
1646 struct super_block *sb,
1647 u32 perms,
1648 struct avc_audit_data *ad)
1649 {
1650 struct task_security_struct *tsec;
1651 struct superblock_security_struct *sbsec;
1652
1653 tsec = tsk->security;
1654 sbsec = sb->s_security;
1655 return avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM,
1656 perms, ad);
1657 }
1658
1659 /* Convert a Linux mode and permission mask to an access vector. */
1660 static inline u32 file_mask_to_av(int mode, int mask)
1661 {
1662 u32 av = 0;
1663
1664 if ((mode & S_IFMT) != S_IFDIR) {
1665 if (mask & MAY_EXEC)
1666 av |= FILE__EXECUTE;
1667 if (mask & MAY_READ)
1668 av |= FILE__READ;
1669
1670 if (mask & MAY_APPEND)
1671 av |= FILE__APPEND;
1672 else if (mask & MAY_WRITE)
1673 av |= FILE__WRITE;
1674
1675 } else {
1676 if (mask & MAY_EXEC)
1677 av |= DIR__SEARCH;
1678 if (mask & MAY_WRITE)
1679 av |= DIR__WRITE;
1680 if (mask & MAY_READ)
1681 av |= DIR__READ;
1682 }
1683
1684 return av;
1685 }
1686
1687 /*
1688 * Convert a file mask to an access vector and include the correct open
1689 * open permission.
1690 */
1691 static inline u32 open_file_mask_to_av(int mode, int mask)
1692 {
1693 u32 av = file_mask_to_av(mode, mask);
1694
1695 if (selinux_policycap_openperm) {
1696 /*
1697 * lnk files and socks do not really have an 'open'
1698 */
1699 if (S_ISREG(mode))
1700 av |= FILE__OPEN;
1701 else if (S_ISCHR(mode))
1702 av |= CHR_FILE__OPEN;
1703 else if (S_ISBLK(mode))
1704 av |= BLK_FILE__OPEN;
1705 else if (S_ISFIFO(mode))
1706 av |= FIFO_FILE__OPEN;
1707 else if (S_ISDIR(mode))
1708 av |= DIR__OPEN;
1709 else
1710 printk(KERN_ERR "SELinux: WARNING: inside %s with "
1711 "unknown mode:%x\n", __func__, mode);
1712 }
1713 return av;
1714 }
1715
1716 /* Convert a Linux file to an access vector. */
1717 static inline u32 file_to_av(struct file *file)
1718 {
1719 u32 av = 0;
1720
1721 if (file->f_mode & FMODE_READ)
1722 av |= FILE__READ;
1723 if (file->f_mode & FMODE_WRITE) {
1724 if (file->f_flags & O_APPEND)
1725 av |= FILE__APPEND;
1726 else
1727 av |= FILE__WRITE;
1728 }
1729 if (!av) {
1730 /*
1731 * Special file opened with flags 3 for ioctl-only use.
1732 */
1733 av = FILE__IOCTL;
1734 }
1735
1736 return av;
1737 }
1738
1739 /* Hook functions begin here. */
1740
1741 static int selinux_ptrace_may_access(struct task_struct *child,
1742 unsigned int mode)
1743 {
1744 int rc;
1745
1746 rc = secondary_ops->ptrace_may_access(child, mode);
1747 if (rc)
1748 return rc;
1749
1750 if (mode == PTRACE_MODE_READ) {
1751 struct task_security_struct *tsec = current->security;
1752 struct task_security_struct *csec = child->security;
1753 return avc_has_perm(tsec->sid, csec->sid,
1754 SECCLASS_FILE, FILE__READ, NULL);
1755 }
1756
1757 return task_has_perm(current, child, PROCESS__PTRACE);
1758 }
1759
1760 static int selinux_ptrace_traceme(struct task_struct *parent)
1761 {
1762 int rc;
1763
1764 rc = secondary_ops->ptrace_traceme(parent);
1765 if (rc)
1766 return rc;
1767
1768 return task_has_perm(parent, current, PROCESS__PTRACE);
1769 }
1770
1771 static int selinux_capget(struct task_struct *target, kernel_cap_t *effective,
1772 kernel_cap_t *inheritable, kernel_cap_t *permitted)
1773 {
1774 int error;
1775
1776 error = task_has_perm(current, target, PROCESS__GETCAP);
1777 if (error)
1778 return error;
1779
1780 return secondary_ops->capget(target, effective, inheritable, permitted);
1781 }
1782
1783 static int selinux_capset_check(struct task_struct *target, kernel_cap_t *effective,
1784 kernel_cap_t *inheritable, kernel_cap_t *permitted)
1785 {
1786 int error;
1787
1788 error = secondary_ops->capset_check(target, effective, inheritable, permitted);
1789 if (error)
1790 return error;
1791
1792 return task_has_perm(current, target, PROCESS__SETCAP);
1793 }
1794
1795 static void selinux_capset_set(struct task_struct *target, kernel_cap_t *effective,
1796 kernel_cap_t *inheritable, kernel_cap_t *permitted)
1797 {
1798 secondary_ops->capset_set(target, effective, inheritable, permitted);
1799 }
1800
1801 static int selinux_capable(struct task_struct *tsk, int cap)
1802 {
1803 int rc;
1804
1805 rc = secondary_ops->capable(tsk, cap);
1806 if (rc)
1807 return rc;
1808
1809 return task_has_capability(tsk, cap);
1810 }
1811
1812 static int selinux_sysctl_get_sid(ctl_table *table, u16 tclass, u32 *sid)
1813 {
1814 int buflen, rc;
1815 char *buffer, *path, *end;
1816
1817 rc = -ENOMEM;
1818 buffer = (char *)__get_free_page(GFP_KERNEL);
1819 if (!buffer)
1820 goto out;
1821
1822 buflen = PAGE_SIZE;
1823 end = buffer+buflen;
1824 *--end = '\0';
1825 buflen--;
1826 path = end-1;
1827 *path = '/';
1828 while (table) {
1829 const char *name = table->procname;
1830 size_t namelen = strlen(name);
1831 buflen -= namelen + 1;
1832 if (buflen < 0)
1833 goto out_free;
1834 end -= namelen;
1835 memcpy(end, name, namelen);
1836 *--end = '/';
1837 path = end;
1838 table = table->parent;
1839 }
1840 buflen -= 4;
1841 if (buflen < 0)
1842 goto out_free;
1843 end -= 4;
1844 memcpy(end, "/sys", 4);
1845 path = end;
1846 rc = security_genfs_sid("proc", path, tclass, sid);
1847 out_free:
1848 free_page((unsigned long)buffer);
1849 out:
1850 return rc;
1851 }
1852
1853 static int selinux_sysctl(ctl_table *table, int op)
1854 {
1855 int error = 0;
1856 u32 av;
1857 struct task_security_struct *tsec;
1858 u32 tsid;
1859 int rc;
1860
1861 rc = secondary_ops->sysctl(table, op);
1862 if (rc)
1863 return rc;
1864
1865 tsec = current->security;
1866
1867 rc = selinux_sysctl_get_sid(table, (op == 0001) ?
1868 SECCLASS_DIR : SECCLASS_FILE, &tsid);
1869 if (rc) {
1870 /* Default to the well-defined sysctl SID. */
1871 tsid = SECINITSID_SYSCTL;
1872 }
1873
1874 /* The op values are "defined" in sysctl.c, thereby creating
1875 * a bad coupling between this module and sysctl.c */
1876 if (op == 001) {
1877 error = avc_has_perm(tsec->sid, tsid,
1878 SECCLASS_DIR, DIR__SEARCH, NULL);
1879 } else {
1880 av = 0;
1881 if (op & 004)
1882 av |= FILE__READ;
1883 if (op & 002)
1884 av |= FILE__WRITE;
1885 if (av)
1886 error = avc_has_perm(tsec->sid, tsid,
1887 SECCLASS_FILE, av, NULL);
1888 }
1889
1890 return error;
1891 }
1892
1893 static int selinux_quotactl(int cmds, int type, int id, struct super_block *sb)
1894 {
1895 int rc = 0;
1896
1897 if (!sb)
1898 return 0;
1899
1900 switch (cmds) {
1901 case Q_SYNC:
1902 case Q_QUOTAON:
1903 case Q_QUOTAOFF:
1904 case Q_SETINFO:
1905 case Q_SETQUOTA:
1906 rc = superblock_has_perm(current, sb, FILESYSTEM__QUOTAMOD,
1907 NULL);
1908 break;
1909 case Q_GETFMT:
1910 case Q_GETINFO:
1911 case Q_GETQUOTA:
1912 rc = superblock_has_perm(current, sb, FILESYSTEM__QUOTAGET,
1913 NULL);
1914 break;
1915 default:
1916 rc = 0; /* let the kernel handle invalid cmds */
1917 break;
1918 }
1919 return rc;
1920 }
1921
1922 static int selinux_quota_on(struct dentry *dentry)
1923 {
1924 return dentry_has_perm(current, NULL, dentry, FILE__QUOTAON);
1925 }
1926
1927 static int selinux_syslog(int type)
1928 {
1929 int rc;
1930
1931 rc = secondary_ops->syslog(type);
1932 if (rc)
1933 return rc;
1934
1935 switch (type) {
1936 case 3: /* Read last kernel messages */
1937 case 10: /* Return size of the log buffer */
1938 rc = task_has_system(current, SYSTEM__SYSLOG_READ);
1939 break;
1940 case 6: /* Disable logging to console */
1941 case 7: /* Enable logging to console */
1942 case 8: /* Set level of messages printed to console */
1943 rc = task_has_system(current, SYSTEM__SYSLOG_CONSOLE);
1944 break;
1945 case 0: /* Close log */
1946 case 1: /* Open log */
1947 case 2: /* Read from log */
1948 case 4: /* Read/clear last kernel messages */
1949 case 5: /* Clear ring buffer */
1950 default:
1951 rc = task_has_system(current, SYSTEM__SYSLOG_MOD);
1952 break;
1953 }
1954 return rc;
1955 }
1956
1957 /*
1958 * Check that a process has enough memory to allocate a new virtual
1959 * mapping. 0 means there is enough memory for the allocation to
1960 * succeed and -ENOMEM implies there is not.
1961 *
1962 * Note that secondary_ops->capable and task_has_perm_noaudit return 0
1963 * if the capability is granted, but __vm_enough_memory requires 1 if
1964 * the capability is granted.
1965 *
1966 * Do not audit the selinux permission check, as this is applied to all
1967 * processes that allocate mappings.
1968 */
1969 static int selinux_vm_enough_memory(struct mm_struct *mm, long pages)
1970 {
1971 int rc, cap_sys_admin = 0;
1972 struct task_security_struct *tsec = current->security;
1973
1974 rc = secondary_ops->capable(current, CAP_SYS_ADMIN);
1975 if (rc == 0)
1976 rc = avc_has_perm_noaudit(tsec->sid, tsec->sid,
1977 SECCLASS_CAPABILITY,
1978 CAP_TO_MASK(CAP_SYS_ADMIN),
1979 0,
1980 NULL);
1981
1982 if (rc == 0)
1983 cap_sys_admin = 1;
1984
1985 return __vm_enough_memory(mm, pages, cap_sys_admin);
1986 }
1987
1988 /* binprm security operations */
1989
1990 static int selinux_bprm_alloc_security(struct linux_binprm *bprm)
1991 {
1992 struct bprm_security_struct *bsec;
1993
1994 bsec = kzalloc(sizeof(struct bprm_security_struct), GFP_KERNEL);
1995 if (!bsec)
1996 return -ENOMEM;
1997
1998 bsec->sid = SECINITSID_UNLABELED;
1999 bsec->set = 0;
2000
2001 bprm->security = bsec;
2002 return 0;
2003 }
2004
2005 static int selinux_bprm_set_security(struct linux_binprm *bprm)
2006 {
2007 struct task_security_struct *tsec;
2008 struct inode *inode = bprm->file->f_path.dentry->d_inode;
2009 struct inode_security_struct *isec;
2010 struct bprm_security_struct *bsec;
2011 u32 newsid;
2012 struct avc_audit_data ad;
2013 int rc;
2014
2015 rc = secondary_ops->bprm_set_security(bprm);
2016 if (rc)
2017 return rc;
2018
2019 bsec = bprm->security;
2020
2021 if (bsec->set)
2022 return 0;
2023
2024 tsec = current->security;
2025 isec = inode->i_security;
2026
2027 /* Default to the current task SID. */
2028 bsec->sid = tsec->sid;
2029
2030 /* Reset fs, key, and sock SIDs on execve. */
2031 tsec->create_sid = 0;
2032 tsec->keycreate_sid = 0;
2033 tsec->sockcreate_sid = 0;
2034
2035 if (tsec->exec_sid) {
2036 newsid = tsec->exec_sid;
2037 /* Reset exec SID on execve. */
2038 tsec->exec_sid = 0;
2039 } else {
2040 /* Check for a default transition on this program. */
2041 rc = security_transition_sid(tsec->sid, isec->sid,
2042 SECCLASS_PROCESS, &newsid);
2043 if (rc)
2044 return rc;
2045 }
2046
2047 AVC_AUDIT_DATA_INIT(&ad, FS);
2048 ad.u.fs.path = bprm->file->f_path;
2049
2050 if (bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID)
2051 newsid = tsec->sid;
2052
2053 if (tsec->sid == newsid) {
2054 rc = avc_has_perm(tsec->sid, isec->sid,
2055 SECCLASS_FILE, FILE__EXECUTE_NO_TRANS, &ad);
2056 if (rc)
2057 return rc;
2058 } else {
2059 /* Check permissions for the transition. */
2060 rc = avc_has_perm(tsec->sid, newsid,
2061 SECCLASS_PROCESS, PROCESS__TRANSITION, &ad);
2062 if (rc)
2063 return rc;
2064
2065 rc = avc_has_perm(newsid, isec->sid,
2066 SECCLASS_FILE, FILE__ENTRYPOINT, &ad);
2067 if (rc)
2068 return rc;
2069
2070 /* Clear any possibly unsafe personality bits on exec: */
2071 current->personality &= ~PER_CLEAR_ON_SETID;
2072
2073 /* Set the security field to the new SID. */
2074 bsec->sid = newsid;
2075 }
2076
2077 bsec->set = 1;
2078 return 0;
2079 }
2080
2081 static int selinux_bprm_check_security(struct linux_binprm *bprm)
2082 {
2083 return secondary_ops->bprm_check_security(bprm);
2084 }
2085
2086
2087 static int selinux_bprm_secureexec(struct linux_binprm *bprm)
2088 {
2089 struct task_security_struct *tsec = current->security;
2090 int atsecure = 0;
2091
2092 if (tsec->osid != tsec->sid) {
2093 /* Enable secure mode for SIDs transitions unless
2094 the noatsecure permission is granted between
2095 the two SIDs, i.e. ahp returns 0. */
2096 atsecure = avc_has_perm(tsec->osid, tsec->sid,
2097 SECCLASS_PROCESS,
2098 PROCESS__NOATSECURE, NULL);
2099 }
2100
2101 return (atsecure || secondary_ops->bprm_secureexec(bprm));
2102 }
2103
2104 static void selinux_bprm_free_security(struct linux_binprm *bprm)
2105 {
2106 kfree(bprm->security);
2107 bprm->security = NULL;
2108 }
2109
2110 extern struct vfsmount *selinuxfs_mount;
2111 extern struct dentry *selinux_null;
2112
2113 /* Derived from fs/exec.c:flush_old_files. */
2114 static inline void flush_unauthorized_files(struct files_struct *files)
2115 {
2116 struct avc_audit_data ad;
2117 struct file *file, *devnull = NULL;
2118 struct tty_struct *tty;
2119 struct fdtable *fdt;
2120 long j = -1;
2121 int drop_tty = 0;
2122
2123 mutex_lock(&tty_mutex);
2124 tty = get_current_tty();
2125 if (tty) {
2126 file_list_lock();
2127 file = list_entry(tty->tty_files.next, typeof(*file), f_u.fu_list);
2128 if (file) {
2129 /* Revalidate access to controlling tty.
2130 Use inode_has_perm on the tty inode directly rather
2131 than using file_has_perm, as this particular open
2132 file may belong to another process and we are only
2133 interested in the inode-based check here. */
2134 struct inode *inode = file->f_path.dentry->d_inode;
2135 if (inode_has_perm(current, inode,
2136 FILE__READ | FILE__WRITE, NULL)) {
2137 drop_tty = 1;
2138 }
2139 }
2140 file_list_unlock();
2141 }
2142 mutex_unlock(&tty_mutex);
2143 /* Reset controlling tty. */
2144 if (drop_tty)
2145 no_tty();
2146
2147 /* Revalidate access to inherited open files. */
2148
2149 AVC_AUDIT_DATA_INIT(&ad, FS);
2150
2151 spin_lock(&files->file_lock);
2152 for (;;) {
2153 unsigned long set, i;
2154 int fd;
2155
2156 j++;
2157 i = j * __NFDBITS;
2158 fdt = files_fdtable(files);
2159 if (i >= fdt->max_fds)
2160 break;
2161 set = fdt->open_fds->fds_bits[j];
2162 if (!set)
2163 continue;
2164 spin_unlock(&files->file_lock);
2165 for ( ; set ; i++, set >>= 1) {
2166 if (set & 1) {
2167 file = fget(i);
2168 if (!file)
2169 continue;
2170 if (file_has_perm(current,
2171 file,
2172 file_to_av(file))) {
2173 sys_close(i);
2174 fd = get_unused_fd();
2175 if (fd != i) {
2176 if (fd >= 0)
2177 put_unused_fd(fd);
2178 fput(file);
2179 continue;
2180 }
2181 if (devnull) {
2182 get_file(devnull);
2183 } else {
2184 devnull = dentry_open(dget(selinux_null), mntget(selinuxfs_mount), O_RDWR);
2185 if (IS_ERR(devnull)) {
2186 devnull = NULL;
2187 put_unused_fd(fd);
2188 fput(file);
2189 continue;
2190 }
2191 }
2192 fd_install(fd, devnull);
2193 }
2194 fput(file);
2195 }
2196 }
2197 spin_lock(&files->file_lock);
2198
2199 }
2200 spin_unlock(&files->file_lock);
2201 }
2202
2203 static void selinux_bprm_apply_creds(struct linux_binprm *bprm, int unsafe)
2204 {
2205 struct task_security_struct *tsec;
2206 struct bprm_security_struct *bsec;
2207 u32 sid;
2208 int rc;
2209
2210 secondary_ops->bprm_apply_creds(bprm, unsafe);
2211
2212 tsec = current->security;
2213
2214 bsec = bprm->security;
2215 sid = bsec->sid;
2216
2217 tsec->osid = tsec->sid;
2218 bsec->unsafe = 0;
2219 if (tsec->sid != sid) {
2220 /* Check for shared state. If not ok, leave SID
2221 unchanged and kill. */
2222 if (unsafe & LSM_UNSAFE_SHARE) {
2223 rc = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS,
2224 PROCESS__SHARE, NULL);
2225 if (rc) {
2226 bsec->unsafe = 1;
2227 return;
2228 }
2229 }
2230
2231 /* Check for ptracing, and update the task SID if ok.
2232 Otherwise, leave SID unchanged and kill. */
2233 if (unsafe & (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) {
2234 struct task_struct *tracer;
2235 struct task_security_struct *sec;
2236 u32 ptsid = 0;
2237
2238 rcu_read_lock();
2239 tracer = tracehook_tracer_task(current);
2240 if (likely(tracer != NULL)) {
2241 sec = tracer->security;
2242 ptsid = sec->sid;
2243 }
2244 rcu_read_unlock();
2245
2246 if (ptsid != 0) {
2247 rc = avc_has_perm(ptsid, sid, SECCLASS_PROCESS,
2248 PROCESS__PTRACE, NULL);
2249 if (rc) {
2250 bsec->unsafe = 1;
2251 return;
2252 }
2253 }
2254 }
2255 tsec->sid = sid;
2256 }
2257 }
2258
2259 /*
2260 * called after apply_creds without the task lock held
2261 */
2262 static void selinux_bprm_post_apply_creds(struct linux_binprm *bprm)
2263 {
2264 struct task_security_struct *tsec;
2265 struct rlimit *rlim, *initrlim;
2266 struct itimerval itimer;
2267 struct bprm_security_struct *bsec;
2268 int rc, i;
2269
2270 tsec = current->security;
2271 bsec = bprm->security;
2272
2273 if (bsec->unsafe) {
2274 force_sig_specific(SIGKILL, current);
2275 return;
2276 }
2277 if (tsec->osid == tsec->sid)
2278 return;
2279
2280 /* Close files for which the new task SID is not authorized. */
2281 flush_unauthorized_files(current->files);
2282
2283 /* Check whether the new SID can inherit signal state
2284 from the old SID. If not, clear itimers to avoid
2285 subsequent signal generation and flush and unblock
2286 signals. This must occur _after_ the task SID has
2287 been updated so that any kill done after the flush
2288 will be checked against the new SID. */
2289 rc = avc_has_perm(tsec->osid, tsec->sid, SECCLASS_PROCESS,
2290 PROCESS__SIGINH, NULL);
2291 if (rc) {
2292 memset(&itimer, 0, sizeof itimer);
2293 for (i = 0; i < 3; i++)
2294 do_setitimer(i, &itimer, NULL);
2295 flush_signals(current);
2296 spin_lock_irq(&current->sighand->siglock);
2297 flush_signal_handlers(current, 1);
2298 sigemptyset(&current->blocked);
2299 recalc_sigpending();
2300 spin_unlock_irq(&current->sighand->siglock);
2301 }
2302
2303 /* Always clear parent death signal on SID transitions. */
2304 current->pdeath_signal = 0;
2305
2306 /* Check whether the new SID can inherit resource limits
2307 from the old SID. If not, reset all soft limits to
2308 the lower of the current task's hard limit and the init
2309 task's soft limit. Note that the setting of hard limits
2310 (even to lower them) can be controlled by the setrlimit
2311 check. The inclusion of the init task's soft limit into
2312 the computation is to avoid resetting soft limits higher
2313 than the default soft limit for cases where the default
2314 is lower than the hard limit, e.g. RLIMIT_CORE or
2315 RLIMIT_STACK.*/
2316 rc = avc_has_perm(tsec->osid, tsec->sid, SECCLASS_PROCESS,
2317 PROCESS__RLIMITINH, NULL);
2318 if (rc) {
2319 for (i = 0; i < RLIM_NLIMITS; i++) {
2320 rlim = current->signal->rlim + i;
2321 initrlim = init_task.signal->rlim+i;
2322 rlim->rlim_cur = min(rlim->rlim_max, initrlim->rlim_cur);
2323 }
2324 if (current->signal->rlim[RLIMIT_CPU].rlim_cur != RLIM_INFINITY) {
2325 /*
2326 * This will cause RLIMIT_CPU calculations
2327 * to be refigured.
2328 */
2329 current->it_prof_expires = jiffies_to_cputime(1);
2330 }
2331 }
2332
2333 /* Wake up the parent if it is waiting so that it can
2334 recheck wait permission to the new task SID. */
2335 wake_up_interruptible(&current->parent->signal->wait_chldexit);
2336 }
2337
2338 /* superblock security operations */
2339
2340 static int selinux_sb_alloc_security(struct super_block *sb)
2341 {
2342 return superblock_alloc_security(sb);
2343 }
2344
2345 static void selinux_sb_free_security(struct super_block *sb)
2346 {
2347 superblock_free_security(sb);
2348 }
2349
2350 static inline int match_prefix(char *prefix, int plen, char *option, int olen)
2351 {
2352 if (plen > olen)
2353 return 0;
2354
2355 return !memcmp(prefix, option, plen);
2356 }
2357
2358 static inline int selinux_option(char *option, int len)
2359 {
2360 return (match_prefix(CONTEXT_STR, sizeof(CONTEXT_STR)-1, option, len) ||
2361 match_prefix(FSCONTEXT_STR, sizeof(FSCONTEXT_STR)-1, option, len) ||
2362 match_prefix(DEFCONTEXT_STR, sizeof(DEFCONTEXT_STR)-1, option, len) ||
2363 match_prefix(ROOTCONTEXT_STR, sizeof(ROOTCONTEXT_STR)-1, option, len));
2364 }
2365
2366 static inline void take_option(char **to, char *from, int *first, int len)
2367 {
2368 if (!*first) {
2369 **to = ',';
2370 *to += 1;
2371 } else
2372 *first = 0;
2373 memcpy(*to, from, len);
2374 *to += len;
2375 }
2376
2377 static inline void take_selinux_option(char **to, char *from, int *first,
2378 int len)
2379 {
2380 int current_size = 0;
2381
2382 if (!*first) {
2383 **to = '|';
2384 *to += 1;
2385 } else
2386 *first = 0;
2387
2388 while (current_size < len) {
2389 if (*from != '"') {
2390 **to = *from;
2391 *to += 1;
2392 }
2393 from += 1;
2394 current_size += 1;
2395 }
2396 }
2397
2398 static int selinux_sb_copy_data(char *orig, char *copy)
2399 {
2400 int fnosec, fsec, rc = 0;
2401 char *in_save, *in_curr, *in_end;
2402 char *sec_curr, *nosec_save, *nosec;
2403 int open_quote = 0;
2404
2405 in_curr = orig;
2406 sec_curr = copy;
2407
2408 nosec = (char *)get_zeroed_page(GFP_KERNEL);
2409 if (!nosec) {
2410 rc = -ENOMEM;
2411 goto out;
2412 }
2413
2414 nosec_save = nosec;
2415 fnosec = fsec = 1;
2416 in_save = in_end = orig;
2417
2418 do {
2419 if (*in_end == '"')
2420 open_quote = !open_quote;
2421 if ((*in_end == ',' && open_quote == 0) ||
2422 *in_end == '\0') {
2423 int len = in_end - in_curr;
2424
2425 if (selinux_option(in_curr, len))
2426 take_selinux_option(&sec_curr, in_curr, &fsec, len);
2427 else
2428 take_option(&nosec, in_curr, &fnosec, len);
2429
2430 in_curr = in_end + 1;
2431 }
2432 } while (*in_end++);
2433
2434 strcpy(in_save, nosec_save);
2435 free_page((unsigned long)nosec_save);
2436 out:
2437 return rc;
2438 }
2439
2440 static int selinux_sb_kern_mount(struct super_block *sb, void *data)
2441 {
2442 struct avc_audit_data ad;
2443 int rc;
2444
2445 rc = superblock_doinit(sb, data);
2446 if (rc)
2447 return rc;
2448
2449 AVC_AUDIT_DATA_INIT(&ad, FS);
2450 ad.u.fs.path.dentry = sb->s_root;
2451 return superblock_has_perm(current, sb, FILESYSTEM__MOUNT, &ad);
2452 }
2453
2454 static int selinux_sb_statfs(struct dentry *dentry)
2455 {
2456 struct avc_audit_data ad;
2457
2458 AVC_AUDIT_DATA_INIT(&ad, FS);
2459 ad.u.fs.path.dentry = dentry->d_sb->s_root;
2460 return superblock_has_perm(current, dentry->d_sb, FILESYSTEM__GETATTR, &ad);
2461 }
2462
2463 static int selinux_mount(char *dev_name,
2464 struct path *path,
2465 char *type,
2466 unsigned long flags,
2467 void *data)
2468 {
2469 int rc;
2470
2471 rc = secondary_ops->sb_mount(dev_name, path, type, flags, data);
2472 if (rc)
2473 return rc;
2474
2475 if (flags & MS_REMOUNT)
2476 return superblock_has_perm(current, path->mnt->mnt_sb,
2477 FILESYSTEM__REMOUNT, NULL);
2478 else
2479 return dentry_has_perm(current, path->mnt, path->dentry,
2480 FILE__MOUNTON);
2481 }
2482
2483 static int selinux_umount(struct vfsmount *mnt, int flags)
2484 {
2485 int rc;
2486
2487 rc = secondary_ops->sb_umount(mnt, flags);
2488 if (rc)
2489 return rc;
2490
2491 return superblock_has_perm(current, mnt->mnt_sb,
2492 FILESYSTEM__UNMOUNT, NULL);
2493 }
2494
2495 /* inode security operations */
2496
2497 static int selinux_inode_alloc_security(struct inode *inode)
2498 {
2499 return inode_alloc_security(inode);
2500 }
2501
2502 static void selinux_inode_free_security(struct inode *inode)
2503 {
2504 inode_free_security(inode);
2505 }
2506
2507 static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
2508 char **name, void **value,
2509 size_t *len)
2510 {
2511 struct task_security_struct *tsec;
2512 struct inode_security_struct *dsec;
2513 struct superblock_security_struct *sbsec;
2514 u32 newsid, clen;
2515 int rc;
2516 char *namep = NULL, *context;
2517
2518 tsec = current->security;
2519 dsec = dir->i_security;
2520 sbsec = dir->i_sb->s_security;
2521
2522 if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) {
2523 newsid = tsec->create_sid;
2524 } else {
2525 rc = security_transition_sid(tsec->sid, dsec->sid,
2526 inode_mode_to_security_class(inode->i_mode),
2527 &newsid);
2528 if (rc) {
2529 printk(KERN_WARNING "%s: "
2530 "security_transition_sid failed, rc=%d (dev=%s "
2531 "ino=%ld)\n",
2532 __func__,
2533 -rc, inode->i_sb->s_id, inode->i_ino);
2534 return rc;
2535 }
2536 }
2537
2538 /* Possibly defer initialization to selinux_complete_init. */
2539 if (sbsec->initialized) {
2540 struct inode_security_struct *isec = inode->i_security;
2541 isec->sclass = inode_mode_to_security_class(inode->i_mode);
2542 isec->sid = newsid;
2543 isec->initialized = 1;
2544 }
2545
2546 if (!ss_initialized || sbsec->behavior == SECURITY_FS_USE_MNTPOINT)
2547 return -EOPNOTSUPP;
2548
2549 if (name) {
2550 namep = kstrdup(XATTR_SELINUX_SUFFIX, GFP_NOFS);
2551 if (!namep)
2552 return -ENOMEM;
2553 *name = namep;
2554 }
2555
2556 if (value && len) {
2557 rc = security_sid_to_context_force(newsid, &context, &clen);
2558 if (rc) {
2559 kfree(namep);
2560 return rc;
2561 }
2562 *value = context;
2563 *len = clen;
2564 }
2565
2566 return 0;
2567 }
2568
2569 static int selinux_inode_create(struct inode *dir, struct dentry *dentry, int mask)
2570 {
2571 return may_create(dir, dentry, SECCLASS_FILE);
2572 }
2573
2574 static int selinux_inode_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry)
2575 {
2576 int rc;
2577
2578 rc = secondary_ops->inode_link(old_dentry, dir, new_dentry);
2579 if (rc)
2580 return rc;
2581 return may_link(dir, old_dentry, MAY_LINK);
2582 }
2583
2584 static int selinux_inode_unlink(struct inode *dir, struct dentry *dentry)
2585 {
2586 int rc;
2587
2588 rc = secondary_ops->inode_unlink(dir, dentry);
2589 if (rc)
2590 return rc;
2591 return may_link(dir, dentry, MAY_UNLINK);
2592 }
2593
2594 static int selinux_inode_symlink(struct inode *dir, struct dentry *dentry, const char *name)
2595 {
2596 return may_create(dir, dentry, SECCLASS_LNK_FILE);
2597 }
2598
2599 static int selinux_inode_mkdir(struct inode *dir, struct dentry *dentry, int mask)
2600 {
2601 return may_create(dir, dentry, SECCLASS_DIR);
2602 }
2603
2604 static int selinux_inode_rmdir(struct inode *dir, struct dentry *dentry)
2605 {
2606 return may_link(dir, dentry, MAY_RMDIR);
2607 }
2608
2609 static int selinux_inode_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
2610 {
2611 int rc;
2612
2613 rc = secondary_ops->inode_mknod(dir, dentry, mode, dev);
2614 if (rc)
2615 return rc;
2616
2617 return may_create(dir, dentry, inode_mode_to_security_class(mode));
2618 }
2619
2620 static int selinux_inode_rename(struct inode *old_inode, struct dentry *old_dentry,
2621 struct inode *new_inode, struct dentry *new_dentry)
2622 {
2623 return may_rename(old_inode, old_dentry, new_inode, new_dentry);
2624 }
2625
2626 static int selinux_inode_readlink(struct dentry *dentry)
2627 {
2628 return dentry_has_perm(current, NULL, dentry, FILE__READ);
2629 }
2630
2631 static int selinux_inode_follow_link(struct dentry *dentry, struct nameidata *nameidata)
2632 {
2633 int rc;
2634
2635 rc = secondary_ops->inode_follow_link(dentry, nameidata);
2636 if (rc)
2637 return rc;
2638 return dentry_has_perm(current, NULL, dentry, FILE__READ);
2639 }
2640
2641 static int selinux_inode_permission(struct inode *inode, int mask)
2642 {
2643 int rc;
2644
2645 rc = secondary_ops->inode_permission(inode, mask);
2646 if (rc)
2647 return rc;
2648
2649 if (!mask) {
2650 /* No permission to check. Existence test. */
2651 return 0;
2652 }
2653
2654 return inode_has_perm(current, inode,
2655 open_file_mask_to_av(inode->i_mode, mask), NULL);
2656 }
2657
2658 static int selinux_inode_setattr(struct dentry *dentry, struct iattr *iattr)
2659 {
2660 int rc;
2661
2662 rc = secondary_ops->inode_setattr(dentry, iattr);
2663 if (rc)
2664 return rc;
2665
2666 if (iattr->ia_valid & ATTR_FORCE)
2667 return 0;
2668
2669 if (iattr->ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID |
2670 ATTR_ATIME_SET | ATTR_MTIME_SET))
2671 return dentry_has_perm(current, NULL, dentry, FILE__SETATTR);
2672
2673 return dentry_has_perm(current, NULL, dentry, FILE__WRITE);
2674 }
2675
2676 static int selinux_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
2677 {
2678 return dentry_has_perm(current, mnt, dentry, FILE__GETATTR);
2679 }
2680
2681 static int selinux_inode_setotherxattr(struct dentry *dentry, const char *name)
2682 {
2683 if (!strncmp(name, XATTR_SECURITY_PREFIX,
2684 sizeof XATTR_SECURITY_PREFIX - 1)) {
2685 if (!strcmp(name, XATTR_NAME_CAPS)) {
2686 if (!capable(CAP_SETFCAP))
2687 return -EPERM;
2688 } else if (!capable(CAP_SYS_ADMIN)) {
2689 /* A different attribute in the security namespace.
2690 Restrict to administrator. */
2691 return -EPERM;
2692 }
2693 }
2694
2695 /* Not an attribute we recognize, so just check the
2696 ordinary setattr permission. */
2697 return dentry_has_perm(current, NULL, dentry, FILE__SETATTR);
2698 }
2699
2700 static int selinux_inode_setxattr(struct dentry *dentry, const char *name,
2701 const void *value, size_t size, int flags)
2702 {
2703 struct task_security_struct *tsec = current->security;
2704 struct inode *inode = dentry->d_inode;
2705 struct inode_security_struct *isec = inode->i_security;
2706 struct superblock_security_struct *sbsec;
2707 struct avc_audit_data ad;
2708 u32 newsid;
2709 int rc = 0;
2710
2711 if (strcmp(name, XATTR_NAME_SELINUX))
2712 return selinux_inode_setotherxattr(dentry, name);
2713
2714 sbsec = inode->i_sb->s_security;
2715 if (sbsec->behavior == SECURITY_FS_USE_MNTPOINT)
2716 return -EOPNOTSUPP;
2717
2718 if (!is_owner_or_cap(inode))
2719 return -EPERM;
2720
2721 AVC_AUDIT_DATA_INIT(&ad, FS);
2722 ad.u.fs.path.dentry = dentry;
2723
2724 rc = avc_has_perm(tsec->sid, isec->sid, isec->sclass,
2725 FILE__RELABELFROM, &ad);
2726 if (rc)
2727 return rc;
2728
2729 rc = security_context_to_sid(value, size, &newsid);
2730 if (rc == -EINVAL) {
2731 if (!capable(CAP_MAC_ADMIN))
2732 return rc;
2733 rc = security_context_to_sid_force(value, size, &newsid);
2734 }
2735 if (rc)
2736 return rc;
2737
2738 rc = avc_has_perm(tsec->sid, newsid, isec->sclass,
2739 FILE__RELABELTO, &ad);
2740 if (rc)
2741 return rc;
2742
2743 rc = security_validate_transition(isec->sid, newsid, tsec->sid,
2744 isec->sclass);
2745 if (rc)
2746 return rc;
2747
2748 return avc_has_perm(newsid,
2749 sbsec->sid,
2750 SECCLASS_FILESYSTEM,
2751 FILESYSTEM__ASSOCIATE,
2752 &ad);
2753 }
2754
2755 static void selinux_inode_post_setxattr(struct dentry *dentry, const char *name,
2756 const void *value, size_t size,
2757 int flags)
2758 {
2759 struct inode *inode = dentry->d_inode;
2760 struct inode_security_struct *isec = inode->i_security;
2761 u32 newsid;
2762 int rc;
2763
2764 if (strcmp(name, XATTR_NAME_SELINUX)) {
2765 /* Not an attribute we recognize, so nothing to do. */
2766 return;
2767 }
2768
2769 rc = security_context_to_sid_force(value, size, &newsid);
2770 if (rc) {
2771 printk(KERN_ERR "SELinux: unable to map context to SID"
2772 "for (%s, %lu), rc=%d\n",
2773 inode->i_sb->s_id, inode->i_ino, -rc);
2774 return;
2775 }
2776
2777 isec->sid = newsid;
2778 return;
2779 }
2780
2781 static int selinux_inode_getxattr(struct dentry *dentry, const char *name)
2782 {
2783 return dentry_has_perm(current, NULL, dentry, FILE__GETATTR);
2784 }
2785
2786 static int selinux_inode_listxattr(struct dentry *dentry)
2787 {
2788 return dentry_has_perm(current, NULL, dentry, FILE__GETATTR);
2789 }
2790
2791 static int selinux_inode_removexattr(struct dentry *dentry, const char *name)
2792 {
2793 if (strcmp(name, XATTR_NAME_SELINUX))
2794 return selinux_inode_setotherxattr(dentry, name);
2795
2796 /* No one is allowed to remove a SELinux security label.
2797 You can change the label, but all data must be labeled. */
2798 return -EACCES;
2799 }
2800
2801 /*
2802 * Copy the inode security context value to the user.
2803 *
2804 * Permission check is handled by selinux_inode_getxattr hook.
2805 */
2806 static int selinux_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc)
2807 {
2808 u32 size;
2809 int error;
2810 char *context = NULL;
2811 struct task_security_struct *tsec = current->security;
2812 struct inode_security_struct *isec = inode->i_security;
2813
2814 if (strcmp(name, XATTR_SELINUX_SUFFIX))
2815 return -EOPNOTSUPP;
2816
2817 /*
2818 * If the caller has CAP_MAC_ADMIN, then get the raw context
2819 * value even if it is not defined by current policy; otherwise,
2820 * use the in-core value under current policy.
2821 * Use the non-auditing forms of the permission checks since
2822 * getxattr may be called by unprivileged processes commonly
2823 * and lack of permission just means that we fall back to the
2824 * in-core context value, not a denial.
2825 */
2826 error = secondary_ops->capable(current, CAP_MAC_ADMIN);
2827 if (!error)
2828 error = avc_has_perm_noaudit(tsec->sid, tsec->sid,
2829 SECCLASS_CAPABILITY2,
2830 CAPABILITY2__MAC_ADMIN,
2831 0,
2832 NULL);
2833 if (!error)
2834 error = security_sid_to_context_force(isec->sid, &context,
2835 &size);
2836 else
2837 error = security_sid_to_context(isec->sid, &context, &size);
2838 if (error)
2839 return error;
2840 error = size;
2841 if (alloc) {
2842 *buffer = context;
2843 goto out_nofree;
2844 }
2845 kfree(context);
2846 out_nofree:
2847 return error;
2848 }
2849
2850 static int selinux_inode_setsecurity(struct inode *inode, const char *name,
2851 const void *value, size_t size, int flags)
2852 {
2853 struct inode_security_struct *isec = inode->i_security;
2854 u32 newsid;
2855 int rc;
2856
2857 if (strcmp(name, XATTR_SELINUX_SUFFIX))
2858 return -EOPNOTSUPP;
2859
2860 if (!value || !size)
2861 return -EACCES;
2862
2863 rc = security_context_to_sid((void *)value, size, &newsid);
2864 if (rc)
2865 return rc;
2866
2867 isec->sid = newsid;
2868 return 0;
2869 }
2870
2871 static int selinux_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
2872 {
2873 const int len = sizeof(XATTR_NAME_SELINUX);
2874 if (buffer && len <= buffer_size)
2875 memcpy(buffer, XATTR_NAME_SELINUX, len);
2876 return len;
2877 }
2878
2879 static int selinux_inode_need_killpriv(struct dentry *dentry)
2880 {
2881 return secondary_ops->inode_need_killpriv(dentry);
2882 }
2883
2884 static int selinux_inode_killpriv(struct dentry *dentry)
2885 {
2886 return secondary_ops->inode_killpriv(dentry);
2887 }
2888
2889 static void selinux_inode_getsecid(const struct inode *inode, u32 *secid)
2890 {
2891 struct inode_security_struct *isec = inode->i_security;
2892 *secid = isec->sid;
2893 }
2894
2895 /* file security operations */
2896
2897 static int selinux_revalidate_file_permission(struct file *file, int mask)
2898 {
2899 int rc;
2900 struct inode *inode = file->f_path.dentry->d_inode;
2901
2902 if (!mask) {
2903 /* No permission to check. Existence test. */
2904 return 0;
2905 }
2906
2907 /* file_mask_to_av won't add FILE__WRITE if MAY_APPEND is set */
2908 if ((file->f_flags & O_APPEND) && (mask & MAY_WRITE))
2909 mask |= MAY_APPEND;
2910
2911 rc = file_has_perm(current, file,
2912 file_mask_to_av(inode->i_mode, mask));
2913 if (rc)
2914 return rc;
2915
2916 return selinux_netlbl_inode_permission(inode, mask);
2917 }
2918
2919 static int selinux_file_permission(struct file *file, int mask)
2920 {
2921 struct inode *inode = file->f_path.dentry->d_inode;
2922 struct task_security_struct *tsec = current->security;
2923 struct file_security_struct *fsec = file->f_security;
2924 struct inode_security_struct *isec = inode->i_security;
2925
2926 if (!mask) {
2927 /* No permission to check. Existence test. */
2928 return 0;
2929 }
2930
2931 if (tsec->sid == fsec->sid && fsec->isid == isec->sid
2932 && fsec->pseqno == avc_policy_seqno())
2933 return selinux_netlbl_inode_permission(inode, mask);
2934
2935 return selinux_revalidate_file_permission(file, mask);
2936 }
2937
2938 static int selinux_file_alloc_security(struct file *file)
2939 {
2940 return file_alloc_security(file);
2941 }
2942
2943 static void selinux_file_free_security(struct file *file)
2944 {
2945 file_free_security(file);
2946 }
2947
2948 static int selinux_file_ioctl(struct file *file, unsigned int cmd,
2949 unsigned long arg)
2950 {
2951 u32 av = 0;
2952
2953 if (_IOC_DIR(cmd) & _IOC_WRITE)
2954 av |= FILE__WRITE;
2955 if (_IOC_DIR(cmd) & _IOC_READ)
2956 av |= FILE__READ;
2957 if (!av)
2958 av = FILE__IOCTL;
2959
2960 return file_has_perm(current, file, av);
2961 }
2962
2963 static int file_map_prot_check(struct file *file, unsigned long prot, int shared)
2964 {
2965 #ifndef CONFIG_PPC32
2966 if ((prot & PROT_EXEC) && (!file || (!shared && (prot & PROT_WRITE)))) {
2967 /*
2968 * We are making executable an anonymous mapping or a
2969 * private file mapping that will also be writable.
2970 * This has an additional check.
2971 */
2972 int rc = task_has_perm(current, current, PROCESS__EXECMEM);
2973 if (rc)
2974 return rc;
2975 }
2976 #endif
2977
2978 if (file) {
2979 /* read access is always possible with a mapping */
2980 u32 av = FILE__READ;
2981
2982 /* write access only matters if the mapping is shared */
2983 if (shared && (prot & PROT_WRITE))
2984 av |= FILE__WRITE;
2985
2986 if (prot & PROT_EXEC)
2987 av |= FILE__EXECUTE;
2988
2989 return file_has_perm(current, file, av);
2990 }
2991 return 0;
2992 }
2993
2994 static int selinux_file_mmap(struct file *file, unsigned long reqprot,
2995 unsigned long prot, unsigned long flags,
2996 unsigned long addr, unsigned long addr_only)
2997 {
2998 int rc = 0;
2999 u32 sid = ((struct task_security_struct *)(current->security))->sid;
3000
3001 if (addr < mmap_min_addr)
3002 rc = avc_has_perm(sid, sid, SECCLASS_MEMPROTECT,
3003 MEMPROTECT__MMAP_ZERO, NULL);
3004 if (rc || addr_only)
3005 return rc;
3006
3007 if (selinux_checkreqprot)
3008 prot = reqprot;
3009
3010 return file_map_prot_check(file, prot,
3011 (flags & MAP_TYPE) == MAP_SHARED);
3012 }
3013
3014 static int selinux_file_mprotect(struct vm_area_struct *vma,
3015 unsigned long reqprot,
3016 unsigned long prot)
3017 {
3018 int rc;
3019
3020 rc = secondary_ops->file_mprotect(vma, reqprot, prot);
3021 if (rc)
3022 return rc;
3023
3024 if (selinux_checkreqprot)
3025 prot = reqprot;
3026
3027 #ifndef CONFIG_PPC32
3028 if ((prot & PROT_EXEC) && !(vma->vm_flags & VM_EXEC)) {
3029 rc = 0;
3030 if (vma->vm_start >= vma->vm_mm->start_brk &&
3031 vma->vm_end <= vma->vm_mm->brk) {
3032 rc = task_has_perm(current, current,
3033 PROCESS__EXECHEAP);
3034 } else if (!vma->vm_file &&
3035 vma->vm_start <= vma->vm_mm->start_stack &&
3036 vma->vm_end >= vma->vm_mm->start_stack) {
3037 rc = task_has_perm(current, current, PROCESS__EXECSTACK);
3038 } else if (vma->vm_file && vma->anon_vma) {
3039 /*
3040 * We are making executable a file mapping that has
3041 * had some COW done. Since pages might have been
3042 * written, check ability to execute the possibly
3043 * modified content. This typically should only
3044 * occur for text relocations.
3045 */
3046 rc = file_has_perm(current, vma->vm_file,
3047 FILE__EXECMOD);
3048 }
3049 if (rc)
3050 return rc;
3051 }
3052 #endif
3053
3054 return file_map_prot_check(vma->vm_file, prot, vma->vm_flags&VM_SHARED);
3055 }
3056
3057 static int selinux_file_lock(struct file *file, unsigned int cmd)
3058 {
3059 return file_has_perm(current, file, FILE__LOCK);
3060 }
3061
3062 static int selinux_file_fcntl(struct file *file, unsigned int cmd,
3063 unsigned long arg)
3064 {
3065 int err = 0;
3066
3067 switch (cmd) {
3068 case F_SETFL:
3069 if (!file->f_path.dentry || !file->f_path.dentry->d_inode) {
3070 err = -EINVAL;
3071 break;
3072 }
3073
3074 if ((file->f_flags & O_APPEND) && !(arg & O_APPEND)) {
3075 err = file_has_perm(current, file, FILE__WRITE);
3076 break;
3077 }
3078 /* fall through */
3079 case F_SETOWN:
3080 case F_SETSIG:
3081 case F_GETFL:
3082 case F_GETOWN:
3083 case F_GETSIG:
3084 /* Just check FD__USE permission */
3085 err = file_has_perm(current, file, 0);
3086 break;
3087 case F_GETLK:
3088 case F_SETLK:
3089 case F_SETLKW:
3090 #if BITS_PER_LONG == 32
3091 case F_GETLK64:
3092 case F_SETLK64:
3093 case F_SETLKW64:
3094 #endif
3095 if (!file->f_path.dentry || !file->f_path.dentry->d_inode) {
3096 err = -EINVAL;
3097 break;
3098 }
3099 err = file_has_perm(current, file, FILE__LOCK);
3100 break;
3101 }
3102
3103 return err;
3104 }
3105
3106 static int selinux_file_set_fowner(struct file *file)
3107 {
3108 struct task_security_struct *tsec;
3109 struct file_security_struct *fsec;
3110
3111 tsec = current->security;
3112 fsec = file->f_security;
3113 fsec->fown_sid = tsec->sid;
3114
3115 return 0;
3116 }
3117
3118 static int selinux_file_send_sigiotask(struct task_struct *tsk,
3119 struct fown_struct *fown, int signum)
3120 {
3121 struct file *file;
3122 u32 perm;
3123 struct task_security_struct *tsec;
3124 struct file_security_struct *fsec;
3125
3126 /* struct fown_struct is never outside the context of a struct file */
3127 file = container_of(fown, struct file, f_owner);
3128
3129 tsec = tsk->security;
3130 fsec = file->f_security;
3131
3132 if (!signum)
3133 perm = signal_to_av(SIGIO); /* as per send_sigio_to_task */
3134 else
3135 perm = signal_to_av(signum);
3136
3137 return avc_has_perm(fsec->fown_sid, tsec->sid,
3138 SECCLASS_PROCESS, perm, NULL);
3139 }
3140
3141 static int selinux_file_receive(struct file *file)
3142 {
3143 return file_has_perm(current, file, file_to_av(file));
3144 }
3145
3146 static int selinux_dentry_open(struct file *file)
3147 {
3148 struct file_security_struct *fsec;
3149 struct inode *inode;
3150 struct inode_security_struct *isec;
3151 inode = file->f_path.dentry->d_inode;
3152 fsec = file->f_security;
3153 isec = inode->i_security;
3154 /*
3155 * Save inode label and policy sequence number
3156 * at open-time so that selinux_file_permission
3157 * can determine whether revalidation is necessary.
3158 * Task label is already saved in the file security
3159 * struct as its SID.
3160 */
3161 fsec->isid = isec->sid;
3162 fsec->pseqno = avc_policy_seqno();
3163 /*
3164 * Since the inode label or policy seqno may have changed
3165 * between the selinux_inode_permission check and the saving
3166 * of state above, recheck that access is still permitted.
3167 * Otherwise, access might never be revalidated against the
3168 * new inode label or new policy.
3169 * This check is not redundant - do not remove.
3170 */
3171 return inode_has_perm(current, inode, file_to_av(file), NULL);
3172 }
3173
3174 /* task security operations */
3175
3176 static int selinux_task_create(unsigned long clone_flags)
3177 {
3178 int rc;
3179
3180 rc = secondary_ops->task_create(clone_flags);
3181 if (rc)
3182 return rc;
3183
3184 return task_has_perm(current, current, PROCESS__FORK);
3185 }
3186
3187 static int selinux_task_alloc_security(struct task_struct *tsk)
3188 {
3189 struct task_security_struct *tsec1, *tsec2;
3190 int rc;
3191
3192 tsec1 = current->security;
3193
3194 rc = task_alloc_security(tsk);
3195 if (rc)
3196 return rc;
3197 tsec2 = tsk->security;
3198
3199 tsec2->osid = tsec1->osid;
3200 tsec2->sid = tsec1->sid;
3201
3202 /* Retain the exec, fs, key, and sock SIDs across fork */
3203 tsec2->exec_sid = tsec1->exec_sid;
3204 tsec2->create_sid = tsec1->create_sid;
3205 tsec2->keycreate_sid = tsec1->keycreate_sid;
3206 tsec2->sockcreate_sid = tsec1->sockcreate_sid;
3207
3208 return 0;
3209 }
3210
3211 static void selinux_task_free_security(struct task_struct *tsk)
3212 {
3213 task_free_security(tsk);
3214 }
3215
3216 static int selinux_task_setuid(uid_t id0, uid_t id1, uid_t id2, int flags)
3217 {
3218 /* Since setuid only affects the current process, and
3219 since the SELinux controls are not based on the Linux
3220 identity attributes, SELinux does not need to control
3221 this operation. However, SELinux does control the use
3222 of the CAP_SETUID and CAP_SETGID capabilities using the
3223 capable hook. */
3224 return 0;
3225 }
3226
3227 static int selinux_task_post_setuid(uid_t id0, uid_t id1, uid_t id2, int flags)
3228 {
3229 return secondary_ops->task_post_setuid(id0, id1, id2, flags);
3230 }
3231
3232 static int selinux_task_setgid(gid_t id0, gid_t id1, gid_t id2, int flags)
3233 {
3234 /* See the comment for setuid above. */
3235 return 0;
3236 }
3237
3238 static int selinux_task_setpgid(struct task_struct *p, pid_t pgid)
3239 {
3240 return task_has_perm(current, p, PROCESS__SETPGID);
3241 }
3242
3243 static int selinux_task_getpgid(struct task_struct *p)
3244 {
3245 return task_has_perm(current, p, PROCESS__GETPGID);
3246 }
3247
3248 static int selinux_task_getsid(struct task_struct *p)
3249 {
3250 return task_has_perm(current, p, PROCESS__GETSESSION);
3251 }
3252
3253 static void selinux_task_getsecid(struct task_struct *p, u32 *secid)
3254 {
3255 struct task_security_struct *tsec = p->security;
3256 *secid = tsec->sid;
3257 }
3258
3259 static int selinux_task_setgroups(struct group_info *group_info)
3260 {
3261 /* See the comment for setuid above. */
3262 return 0;
3263 }
3264
3265 static int selinux_task_setnice(struct task_struct *p, int nice)
3266 {
3267 int rc;
3268
3269 rc = secondary_ops->task_setnice(p, nice);
3270 if (rc)
3271 return rc;
3272
3273 return task_has_perm(current, p, PROCESS__SETSCHED);
3274 }
3275
3276 static int selinux_task_setioprio(struct task_struct *p, int ioprio)
3277 {
3278 int rc;
3279
3280 rc = secondary_ops->task_setioprio(p, ioprio);
3281 if (rc)
3282 return rc;
3283
3284 return task_has_perm(current, p, PROCESS__SETSCHED);
3285 }
3286
3287 static int selinux_task_getioprio(struct task_struct *p)
3288 {
3289 return task_has_perm(current, p, PROCESS__GETSCHED);
3290 }
3291
3292 static int selinux_task_setrlimit(unsigned int resource, struct rlimit *new_rlim)
3293 {
3294 struct rlimit *old_rlim = current->signal->rlim + resource;
3295 int rc;
3296
3297 rc = secondary_ops->task_setrlimit(resource, new_rlim);
3298 if (rc)
3299 return rc;
3300
3301 /* Control the ability to change the hard limit (whether
3302 lowering or raising it), so that the hard limit can
3303 later be used as a safe reset point for the soft limit
3304 upon context transitions. See selinux_bprm_apply_creds. */
3305 if (old_rlim->rlim_max != new_rlim->rlim_max)
3306 return task_has_perm(current, current, PROCESS__SETRLIMIT);
3307
3308 return 0;
3309 }
3310
3311 static int selinux_task_setscheduler(struct task_struct *p, int policy, struct sched_param *lp)
3312 {
3313 int rc;
3314
3315 rc = secondary_ops->task_setscheduler(p, policy, lp);
3316 if (rc)
3317 return rc;
3318
3319 return task_has_perm(current, p, PROCESS__SETSCHED);
3320 }
3321
3322 static int selinux_task_getscheduler(struct task_struct *p)
3323 {
3324 return task_has_perm(current, p, PROCESS__GETSCHED);
3325 }
3326
3327 static int selinux_task_movememory(struct task_struct *p)
3328 {
3329 return task_has_perm(current, p, PROCESS__SETSCHED);
3330 }
3331
3332 static int selinux_task_kill(struct task_struct *p, struct siginfo *info,
3333 int sig, u32 secid)
3334 {
3335 u32 perm;
3336 int rc;
3337 struct task_security_struct *tsec;
3338
3339 rc = secondary_ops->task_kill(p, info, sig, secid);
3340 if (rc)
3341 return rc;
3342
3343 if (!sig)
3344 perm = PROCESS__SIGNULL; /* null signal; existence test */
3345 else
3346 perm = signal_to_av(sig);
3347 tsec = p->security;
3348 if (secid)
3349 rc = avc_has_perm(secid, tsec->sid, SECCLASS_PROCESS, perm, NULL);
3350 else
3351 rc = task_has_perm(current, p, perm);
3352 return rc;
3353 }
3354
3355 static int selinux_task_prctl(int option,
3356 unsigned long arg2,
3357 unsigned long arg3,
3358 unsigned long arg4,
3359 unsigned long arg5,
3360 long *rc_p)
3361 {
3362 /* The current prctl operations do not appear to require
3363 any SELinux controls since they merely observe or modify
3364 the state of the current process. */
3365 return secondary_ops->task_prctl(option, arg2, arg3, arg4, arg5, rc_p);
3366 }
3367
3368 static int selinux_task_wait(struct task_struct *p)
3369 {
3370 return task_has_perm(p, current, PROCESS__SIGCHLD);
3371 }
3372
3373 static void selinux_task_reparent_to_init(struct task_struct *p)
3374 {
3375 struct task_security_struct *tsec;
3376
3377 secondary_ops->task_reparent_to_init(p);
3378
3379 tsec = p->security;
3380 tsec->osid = tsec->sid;
3381 tsec->sid = SECINITSID_KERNEL;
3382 return;
3383 }
3384
3385 static void selinux_task_to_inode(struct task_struct *p,
3386 struct inode *inode)
3387 {
3388 struct task_security_struct *tsec = p->security;
3389 struct inode_security_struct *isec = inode->i_security;
3390
3391 isec->sid = tsec->sid;
3392 isec->initialized = 1;
3393 return;
3394 }
3395
3396 /* Returns error only if unable to parse addresses */
3397 static int selinux_parse_skb_ipv4(struct sk_buff *skb,
3398 struct avc_audit_data *ad, u8 *proto)
3399 {
3400 int offset, ihlen, ret = -EINVAL;
3401 struct iphdr _iph, *ih;
3402
3403 offset = skb_network_offset(skb);
3404 ih = skb_header_pointer(skb, offset, sizeof(_iph), &_iph);
3405 if (ih == NULL)
3406 goto out;
3407
3408 ihlen = ih->ihl * 4;
3409 if (ihlen < sizeof(_iph))
3410 goto out;
3411
3412 ad->u.net.v4info.saddr = ih->saddr;
3413 ad->u.net.v4info.daddr = ih->daddr;
3414 ret = 0;
3415
3416 if (proto)
3417 *proto = ih->protocol;
3418
3419 switch (ih->protocol) {
3420 case IPPROTO_TCP: {
3421 struct tcphdr _tcph, *th;
3422
3423 if (ntohs(ih->frag_off) & IP_OFFSET)
3424 break;
3425
3426 offset += ihlen;
3427 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
3428 if (th == NULL)
3429 break;
3430
3431 ad->u.net.sport = th->source;
3432 ad->u.net.dport = th->dest;
3433 break;
3434 }
3435
3436 case IPPROTO_UDP: {
3437 struct udphdr _udph, *uh;
3438
3439 if (ntohs(ih->frag_off) & IP_OFFSET)
3440 break;
3441
3442 offset += ihlen;
3443 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
3444 if (uh == NULL)
3445 break;
3446
3447 ad->u.net.sport = uh->source;
3448 ad->u.net.dport = uh->dest;
3449 break;
3450 }
3451
3452 case IPPROTO_DCCP: {
3453 struct dccp_hdr _dccph, *dh;
3454
3455 if (ntohs(ih->frag_off) & IP_OFFSET)
3456 break;
3457
3458 offset += ihlen;
3459 dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
3460 if (dh == NULL)
3461 break;
3462
3463 ad->u.net.sport = dh->dccph_sport;
3464 ad->u.net.dport = dh->dccph_dport;
3465 break;
3466 }
3467
3468 default:
3469 break;
3470 }
3471 out:
3472 return ret;
3473 }
3474
3475 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3476
3477 /* Returns error only if unable to parse addresses */
3478 static int selinux_parse_skb_ipv6(struct sk_buff *skb,
3479 struct avc_audit_data *ad, u8 *proto)
3480 {
3481 u8 nexthdr;
3482 int ret = -EINVAL, offset;
3483 struct ipv6hdr _ipv6h, *ip6;
3484
3485 offset = skb_network_offset(skb);
3486 ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h);
3487 if (ip6 == NULL)
3488 goto out;
3489
3490 ipv6_addr_copy(&ad->u.net.v6info.saddr, &ip6->saddr);
3491 ipv6_addr_copy(&ad->u.net.v6info.daddr, &ip6->daddr);
3492 ret = 0;
3493
3494 nexthdr = ip6->nexthdr;
3495 offset += sizeof(_ipv6h);
3496 offset = ipv6_skip_exthdr(skb, offset, &nexthdr);
3497 if (offset < 0)
3498 goto out;
3499
3500 if (proto)
3501 *proto = nexthdr;
3502
3503 switch (nexthdr) {
3504 case IPPROTO_TCP: {
3505 struct tcphdr _tcph, *th;
3506
3507 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
3508 if (th == NULL)
3509 break;
3510
3511 ad->u.net.sport = th->source;
3512 ad->u.net.dport = th->dest;
3513 break;
3514 }
3515
3516 case IPPROTO_UDP: {
3517 struct udphdr _udph, *uh;
3518
3519 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
3520 if (uh == NULL)
3521 break;
3522
3523 ad->u.net.sport = uh->source;
3524 ad->u.net.dport = uh->dest;
3525 break;
3526 }
3527
3528 case IPPROTO_DCCP: {
3529 struct dccp_hdr _dccph, *dh;
3530
3531 dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
3532 if (dh == NULL)
3533 break;
3534
3535 ad->u.net.sport = dh->dccph_sport;
3536 ad->u.net.dport = dh->dccph_dport;
3537 break;
3538 }
3539
3540 /* includes fragments */
3541 default:
3542 break;
3543 }
3544 out:
3545 return ret;
3546 }
3547
3548 #endif /* IPV6 */
3549
3550 static int selinux_parse_skb(struct sk_buff *skb, struct avc_audit_data *ad,
3551 char **addrp, int src, u8 *proto)
3552 {
3553 int ret = 0;
3554
3555 switch (ad->u.net.family) {
3556 case PF_INET:
3557 ret = selinux_parse_skb_ipv4(skb, ad, proto);
3558 if (ret || !addrp)
3559 break;
3560 *addrp = (char *)(src ? &ad->u.net.v4info.saddr :
3561 &ad->u.net.v4info.daddr);
3562 break;
3563
3564 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3565 case PF_INET6:
3566 ret = selinux_parse_skb_ipv6(skb, ad, proto);
3567 if (ret || !addrp)
3568 break;
3569 *addrp = (char *)(src ? &ad->u.net.v6info.saddr :
3570 &ad->u.net.v6info.daddr);
3571 break;
3572 #endif /* IPV6 */
3573 default:
3574 break;
3575 }
3576
3577 if (unlikely(ret))
3578 printk(KERN_WARNING
3579 "SELinux: failure in selinux_parse_skb(),"
3580 " unable to parse packet\n");
3581
3582 return ret;
3583 }
3584
3585 /**
3586 * selinux_skb_peerlbl_sid - Determine the peer label of a packet
3587 * @skb: the packet
3588 * @family: protocol family
3589 * @sid: the packet's peer label SID
3590 *
3591 * Description:
3592 * Check the various different forms of network peer labeling and determine
3593 * the peer label/SID for the packet; most of the magic actually occurs in
3594 * the security server function security_net_peersid_cmp(). The function
3595 * returns zero if the value in @sid is valid (although it may be SECSID_NULL)
3596 * or -EACCES if @sid is invalid due to inconsistencies with the different
3597 * peer labels.
3598 *
3599 */
3600 static int selinux_skb_peerlbl_sid(struct sk_buff *skb, u16 family, u32 *sid)
3601 {
3602 int err;
3603 u32 xfrm_sid;
3604 u32 nlbl_sid;
3605 u32 nlbl_type;
3606
3607 selinux_skb_xfrm_sid(skb, &xfrm_sid);
3608 selinux_netlbl_skbuff_getsid(skb, family, &nlbl_type, &nlbl_sid);
3609
3610 err = security_net_peersid_resolve(nlbl_sid, nlbl_type, xfrm_sid, sid);
3611 if (unlikely(err)) {
3612 printk(KERN_WARNING
3613 "SELinux: failure in selinux_skb_peerlbl_sid(),"
3614 " unable to determine packet's peer label\n");
3615 return -EACCES;
3616 }
3617
3618 return 0;
3619 }
3620
3621 /* socket security operations */
3622 static int socket_has_perm(struct task_struct *task, struct socket *sock,
3623 u32 perms)
3624 {
3625 struct inode_security_struct *isec;
3626 struct task_security_struct *tsec;
3627 struct avc_audit_data ad;
3628 int err = 0;
3629
3630 tsec = task->security;
3631 isec = SOCK_INODE(sock)->i_security;
3632
3633 if (isec->sid == SECINITSID_KERNEL)
3634 goto out;
3635
3636 AVC_AUDIT_DATA_INIT(&ad, NET);
3637 ad.u.net.sk = sock->sk;
3638 err = avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, &ad);
3639
3640 out:
3641 return err;
3642 }
3643
3644 static int selinux_socket_create(int family, int type,
3645 int protocol, int kern)
3646 {
3647 int err = 0;
3648 struct task_security_struct *tsec;
3649 u32 newsid;
3650
3651 if (kern)
3652 goto out;
3653
3654 tsec = current->security;
3655 newsid = tsec->sockcreate_sid ? : tsec->sid;
3656 err = avc_has_perm(tsec->sid, newsid,
3657 socket_type_to_security_class(family, type,
3658 protocol), SOCKET__CREATE, NULL);
3659
3660 out:
3661 return err;
3662 }
3663
3664 static int selinux_socket_post_create(struct socket *sock, int family,
3665 int type, int protocol, int kern)
3666 {
3667 int err = 0;
3668 struct inode_security_struct *isec;
3669 struct task_security_struct *tsec;
3670 struct sk_security_struct *sksec;
3671 u32 newsid;
3672
3673 isec = SOCK_INODE(sock)->i_security;
3674
3675 tsec = current->security;
3676 newsid = tsec->sockcreate_sid ? : tsec->sid;
3677 isec->sclass = socket_type_to_security_class(family, type, protocol);
3678 isec->sid = kern ? SECINITSID_KERNEL : newsid;
3679 isec->initialized = 1;
3680
3681 if (sock->sk) {
3682 sksec = sock->sk->sk_security;
3683 sksec->sid = isec->sid;
3684 sksec->sclass = isec->sclass;
3685 err = selinux_netlbl_socket_post_create(sock);
3686 }
3687
3688 return err;
3689 }
3690
3691 /* Range of port numbers used to automatically bind.
3692 Need to determine whether we should perform a name_bind
3693 permission check between the socket and the port number. */
3694
3695 static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, int addrlen)
3696 {
3697 u16 family;
3698 int err;
3699
3700 err = socket_has_perm(current, sock, SOCKET__BIND);
3701 if (err)
3702 goto out;
3703
3704 /*
3705 * If PF_INET or PF_INET6, check name_bind permission for the port.
3706 * Multiple address binding for SCTP is not supported yet: we just
3707 * check the first address now.
3708 */
3709 family = sock->sk->sk_family;
3710 if (family == PF_INET || family == PF_INET6) {
3711 char *addrp;
3712 struct inode_security_struct *isec;
3713 struct task_security_struct *tsec;
3714 struct avc_audit_data ad;
3715 struct sockaddr_in *addr4 = NULL;
3716 struct sockaddr_in6 *addr6 = NULL;
3717 unsigned short snum;
3718 struct sock *sk = sock->sk;
3719 u32 sid, node_perm;
3720
3721 tsec = current->security;
3722 isec = SOCK_INODE(sock)->i_security;
3723
3724 if (family == PF_INET) {
3725 addr4 = (struct sockaddr_in *)address;
3726 snum = ntohs(addr4->sin_port);
3727 addrp = (char *)&addr4->sin_addr.s_addr;
3728 } else {
3729 addr6 = (struct sockaddr_in6 *)address;
3730 snum = ntohs(addr6->sin6_port);
3731 addrp = (char *)&addr6->sin6_addr.s6_addr;
3732 }
3733
3734 if (snum) {
3735 int low, high;
3736
3737 inet_get_local_port_range(&low, &high);
3738
3739 if (snum < max(PROT_SOCK, low) || snum > high) {
3740 err = sel_netport_sid(sk->sk_protocol,
3741 snum, &sid);
3742 if (err)
3743 goto out;
3744 AVC_AUDIT_DATA_INIT(&ad, NET);
3745 ad.u.net.sport = htons(snum);
3746 ad.u.net.family = family;
3747 err = avc_has_perm(isec->sid, sid,
3748 isec->sclass,
3749 SOCKET__NAME_BIND, &ad);
3750 if (err)
3751 goto out;
3752 }
3753 }
3754
3755 switch (isec->sclass) {
3756 case SECCLASS_TCP_SOCKET:
3757 node_perm = TCP_SOCKET__NODE_BIND;
3758 break;
3759
3760 case SECCLASS_UDP_SOCKET:
3761 node_perm = UDP_SOCKET__NODE_BIND;
3762 break;
3763
3764 case SECCLASS_DCCP_SOCKET:
3765 node_perm = DCCP_SOCKET__NODE_BIND;
3766 break;
3767
3768 default:
3769 node_perm = RAWIP_SOCKET__NODE_BIND;
3770 break;
3771 }
3772
3773 err = sel_netnode_sid(addrp, family, &sid);
3774 if (err)
3775 goto out;
3776
3777 AVC_AUDIT_DATA_INIT(&ad, NET);
3778 ad.u.net.sport = htons(snum);
3779 ad.u.net.family = family;
3780
3781 if (family == PF_INET)
3782 ad.u.net.v4info.saddr = addr4->sin_addr.s_addr;
3783 else
3784 ipv6_addr_copy(&ad.u.net.v6info.saddr, &addr6->sin6_addr);
3785
3786 err = avc_has_perm(isec->sid, sid,
3787 isec->sclass, node_perm, &ad);
3788 if (err)
3789 goto out;
3790 }
3791 out:
3792 return err;
3793 }
3794
3795 static int selinux_socket_connect(struct socket *sock, struct sockaddr *address, int addrlen)
3796 {
3797 struct inode_security_struct *isec;
3798 int err;
3799
3800 err = socket_has_perm(current, sock, SOCKET__CONNECT);
3801 if (err)
3802 return err;
3803
3804 /*
3805 * If a TCP or DCCP socket, check name_connect permission for the port.
3806 */
3807 isec = SOCK_INODE(sock)->i_security;
3808 if (isec->sclass == SECCLASS_TCP_SOCKET ||
3809 isec->sclass == SECCLASS_DCCP_SOCKET) {
3810 struct sock *sk = sock->sk;
3811 struct avc_audit_data ad;
3812 struct sockaddr_in *addr4 = NULL;
3813 struct sockaddr_in6 *addr6 = NULL;
3814 unsigned short snum;
3815 u32 sid, perm;
3816
3817 if (sk->sk_family == PF_INET) {
3818 addr4 = (struct sockaddr_in *)address;
3819 if (addrlen < sizeof(struct sockaddr_in))
3820 return -EINVAL;
3821 snum = ntohs(addr4->sin_port);
3822 } else {
3823 addr6 = (struct sockaddr_in6 *)address;
3824 if (addrlen < SIN6_LEN_RFC2133)
3825 return -EINVAL;
3826 snum = ntohs(addr6->sin6_port);
3827 }
3828
3829 err = sel_netport_sid(sk->sk_protocol, snum, &sid);
3830 if (err)
3831 goto out;
3832
3833 perm = (isec->sclass == SECCLASS_TCP_SOCKET) ?
3834 TCP_SOCKET__NAME_CONNECT : DCCP_SOCKET__NAME_CONNECT;
3835
3836 AVC_AUDIT_DATA_INIT(&ad, NET);
3837 ad.u.net.dport = htons(snum);
3838 ad.u.net.family = sk->sk_family;
3839 err = avc_has_perm(isec->sid, sid, isec->sclass, perm, &ad);
3840 if (err)
3841 goto out;
3842 }
3843
3844 out:
3845 return err;
3846 }
3847
3848 static int selinux_socket_listen(struct socket *sock, int backlog)
3849 {
3850 return socket_has_perm(current, sock, SOCKET__LISTEN);
3851 }
3852
3853 static int selinux_socket_accept(struct socket *sock, struct socket *newsock)
3854 {
3855 int err;
3856 struct inode_security_struct *isec;
3857 struct inode_security_struct *newisec;
3858
3859 err = socket_has_perm(current, sock, SOCKET__ACCEPT);
3860 if (err)
3861 return err;
3862
3863 newisec = SOCK_INODE(newsock)->i_security;
3864
3865 isec = SOCK_INODE(sock)->i_security;
3866 newisec->sclass = isec->sclass;
3867 newisec->sid = isec->sid;
3868 newisec->initialized = 1;
3869
3870 return 0;
3871 }
3872
3873 static int selinux_socket_sendmsg(struct socket *sock, struct msghdr *msg,
3874 int size)
3875 {
3876 int rc;
3877
3878 rc = socket_has_perm(current, sock, SOCKET__WRITE);
3879 if (rc)
3880 return rc;
3881
3882 return selinux_netlbl_inode_permission(SOCK_INODE(sock), MAY_WRITE);
3883 }
3884
3885 static int selinux_socket_recvmsg(struct socket *sock, struct msghdr *msg,
3886 int size, int flags)
3887 {
3888 return socket_has_perm(current, sock, SOCKET__READ);
3889 }
3890
3891 static int selinux_socket_getsockname(struct socket *sock)
3892 {
3893 return socket_has_perm(current, sock, SOCKET__GETATTR);
3894 }
3895
3896 static int selinux_socket_getpeername(struct socket *sock)
3897 {
3898 return socket_has_perm(current, sock, SOCKET__GETATTR);
3899 }
3900
3901 static int selinux_socket_setsockopt(struct socket *sock, int level, int optname)
3902 {
3903 int err;
3904
3905 err = socket_has_perm(current, sock, SOCKET__SETOPT);
3906 if (err)
3907 return err;
3908
3909 return selinux_netlbl_socket_setsockopt(sock, level, optname);
3910 }
3911
3912 static int selinux_socket_getsockopt(struct socket *sock, int level,
3913 int optname)
3914 {
3915 return socket_has_perm(current, sock, SOCKET__GETOPT);
3916 }
3917
3918 static int selinux_socket_shutdown(struct socket *sock, int how)
3919 {
3920 return socket_has_perm(current, sock, SOCKET__SHUTDOWN);
3921 }
3922
3923 static int selinux_socket_unix_stream_connect(struct socket *sock,
3924 struct socket *other,
3925 struct sock *newsk)
3926 {
3927 struct sk_security_struct *ssec;
3928 struct inode_security_struct *isec;
3929 struct inode_security_struct *other_isec;
3930 struct avc_audit_data ad;
3931 int err;
3932
3933 err = secondary_ops->unix_stream_connect(sock, other, newsk);
3934 if (err)
3935 return err;
3936
3937 isec = SOCK_INODE(sock)->i_security;
3938 other_isec = SOCK_INODE(other)->i_security;
3939
3940 AVC_AUDIT_DATA_INIT(&ad, NET);
3941 ad.u.net.sk = other->sk;
3942
3943 err = avc_has_perm(isec->sid, other_isec->sid,
3944 isec->sclass,
3945 UNIX_STREAM_SOCKET__CONNECTTO, &ad);
3946 if (err)
3947 return err;
3948
3949 /* connecting socket */
3950 ssec = sock->sk->sk_security;
3951 ssec->peer_sid = other_isec->sid;
3952
3953 /* server child socket */
3954 ssec = newsk->sk_security;
3955 ssec->peer_sid = isec->sid;
3956 err = security_sid_mls_copy(other_isec->sid, ssec->peer_sid, &ssec->sid);
3957
3958 return err;
3959 }
3960
3961 static int selinux_socket_unix_may_send(struct socket *sock,
3962 struct socket *other)
3963 {
3964 struct inode_security_struct *isec;
3965 struct inode_security_struct *other_isec;
3966 struct avc_audit_data ad;
3967 int err;
3968
3969 isec = SOCK_INODE(sock)->i_security;
3970 other_isec = SOCK_INODE(other)->i_security;
3971
3972 AVC_AUDIT_DATA_INIT(&ad, NET);
3973 ad.u.net.sk = other->sk;
3974
3975 err = avc_has_perm(isec->sid, other_isec->sid,
3976 isec->sclass, SOCKET__SENDTO, &ad);
3977 if (err)
3978 return err;
3979
3980 return 0;
3981 }
3982
3983 static int selinux_inet_sys_rcv_skb(int ifindex, char *addrp, u16 family,
3984 u32 peer_sid,
3985 struct avc_audit_data *ad)
3986 {
3987 int err;
3988 u32 if_sid;
3989 u32 node_sid;
3990
3991 err = sel_netif_sid(ifindex, &if_sid);
3992 if (err)
3993 return err;
3994 err = avc_has_perm(peer_sid, if_sid,
3995 SECCLASS_NETIF, NETIF__INGRESS, ad);
3996 if (err)
3997 return err;
3998
3999 err = sel_netnode_sid(addrp, family, &node_sid);
4000 if (err)
4001 return err;
4002 return avc_has_perm(peer_sid, node_sid,
4003 SECCLASS_NODE, NODE__RECVFROM, ad);
4004 }
4005
4006 static int selinux_sock_rcv_skb_iptables_compat(struct sock *sk,
4007 struct sk_buff *skb,
4008 struct avc_audit_data *ad,
4009 u16 family,
4010 char *addrp)
4011 {
4012 int err;
4013 struct sk_security_struct *sksec = sk->sk_security;
4014 u16 sk_class;
4015 u32 netif_perm, node_perm, recv_perm;
4016 u32 port_sid, node_sid, if_sid, sk_sid;
4017
4018 sk_sid = sksec->sid;
4019 sk_class = sksec->sclass;
4020
4021 switch (sk_class) {
4022 case SECCLASS_UDP_SOCKET:
4023 netif_perm = NETIF__UDP_RECV;
4024 node_perm = NODE__UDP_RECV;
4025 recv_perm = UDP_SOCKET__RECV_MSG;
4026 break;
4027 case SECCLASS_TCP_SOCKET:
4028 netif_perm = NETIF__TCP_RECV;
4029 node_perm = NODE__TCP_RECV;
4030 recv_perm = TCP_SOCKET__RECV_MSG;
4031 break;
4032 case SECCLASS_DCCP_SOCKET:
4033 netif_perm = NETIF__DCCP_RECV;
4034 node_perm = NODE__DCCP_RECV;
4035 recv_perm = DCCP_SOCKET__RECV_MSG;
4036 break;
4037 default:
4038 netif_perm = NETIF__RAWIP_RECV;
4039 node_perm = NODE__RAWIP_RECV;
4040 recv_perm = 0;
4041 break;
4042 }
4043
4044 err = sel_netif_sid(skb->iif, &if_sid);
4045 if (err)
4046 return err;
4047 err = avc_has_perm(sk_sid, if_sid, SECCLASS_NETIF, netif_perm, ad);
4048 if (err)
4049 return err;
4050
4051 err = sel_netnode_sid(addrp, family, &node_sid);
4052 if (err)
4053 return err;
4054 err = avc_has_perm(sk_sid, node_sid, SECCLASS_NODE, node_perm, ad);
4055 if (err)
4056 return err;
4057
4058 if (!recv_perm)
4059 return 0;
4060 err = sel_netport_sid(sk->sk_protocol,
4061 ntohs(ad->u.net.sport), &port_sid);
4062 if (unlikely(err)) {
4063 printk(KERN_WARNING
4064 "SELinux: failure in"
4065 " selinux_sock_rcv_skb_iptables_compat(),"
4066 " network port label not found\n");
4067 return err;
4068 }
4069 return avc_has_perm(sk_sid, port_sid, sk_class, recv_perm, ad);
4070 }
4071
4072 static int selinux_sock_rcv_skb_compat(struct sock *sk, struct sk_buff *skb,
4073 u16 family)
4074 {
4075 int err;
4076 struct sk_security_struct *sksec = sk->sk_security;
4077 u32 peer_sid;
4078 u32 sk_sid = sksec->sid;
4079 struct avc_audit_data ad;
4080 char *addrp;
4081
4082 AVC_AUDIT_DATA_INIT(&ad, NET);
4083 ad.u.net.netif = skb->iif;
4084 ad.u.net.family = family;
4085 err = selinux_parse_skb(skb, &ad, &addrp, 1, NULL);
4086 if (err)
4087 return err;
4088
4089 if (selinux_compat_net)
4090 err = selinux_sock_rcv_skb_iptables_compat(sk, skb, &ad,
4091 family, addrp);
4092 else
4093 err = avc_has_perm(sk_sid, skb->secmark, SECCLASS_PACKET,
4094 PACKET__RECV, &ad);
4095 if (err)
4096 return err;
4097
4098 if (selinux_policycap_netpeer) {
4099 err = selinux_skb_peerlbl_sid(skb, family, &peer_sid);
4100 if (err)
4101 return err;
4102 err = avc_has_perm(sk_sid, peer_sid,
4103 SECCLASS_PEER, PEER__RECV, &ad);
4104 } else {
4105 err = selinux_netlbl_sock_rcv_skb(sksec, skb, family, &ad);
4106 if (err)
4107 return err;
4108 err = selinux_xfrm_sock_rcv_skb(sksec->sid, skb, &ad);
4109 }
4110
4111 return err;
4112 }
4113
4114 static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
4115 {
4116 int err;
4117 struct sk_security_struct *sksec = sk->sk_security;
4118 u16 family = sk->sk_family;
4119 u32 sk_sid = sksec->sid;
4120 struct avc_audit_data ad;
4121 char *addrp;
4122 u8 secmark_active;
4123 u8 peerlbl_active;
4124
4125 if (family != PF_INET && family != PF_INET6)
4126 return 0;
4127
4128 /* Handle mapped IPv4 packets arriving via IPv6 sockets */
4129 if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
4130 family = PF_INET;
4131
4132 /* If any sort of compatibility mode is enabled then handoff processing
4133 * to the selinux_sock_rcv_skb_compat() function to deal with the
4134 * special handling. We do this in an attempt to keep this function
4135 * as fast and as clean as possible. */
4136 if (selinux_compat_net || !selinux_policycap_netpeer)
4137 return selinux_sock_rcv_skb_compat(sk, skb, family);
4138
4139 secmark_active = selinux_secmark_enabled();
4140 peerlbl_active = netlbl_enabled() || selinux_xfrm_enabled();
4141 if (!secmark_active && !peerlbl_active)
4142 return 0;
4143
4144 AVC_AUDIT_DATA_INIT(&ad, NET);
4145 ad.u.net.netif = skb->iif;
4146 ad.u.net.family = family;
4147 err = selinux_parse_skb(skb, &ad, &addrp, 1, NULL);
4148 if (err)
4149 return err;
4150
4151 if (peerlbl_active) {
4152 u32 peer_sid;
4153
4154 err = selinux_skb_peerlbl_sid(skb, family, &peer_sid);
4155 if (err)
4156 return err;
4157 err = selinux_inet_sys_rcv_skb(skb->iif, addrp, family,
4158 peer_sid, &ad);
4159 if (err)
4160 return err;
4161 err = avc_has_perm(sk_sid, peer_sid, SECCLASS_PEER,
4162 PEER__RECV, &ad);
4163 }
4164
4165 if (secmark_active) {
4166 err = avc_has_perm(sk_sid, skb->secmark, SECCLASS_PACKET,
4167 PACKET__RECV, &ad);
4168 if (err)
4169 return err;
4170 }
4171
4172 return err;
4173 }
4174
4175 static int selinux_socket_getpeersec_stream(struct socket *sock, char __user *optval,
4176 int __user *optlen, unsigned len)
4177 {
4178 int err = 0;
4179 char *scontext;
4180 u32 scontext_len;
4181 struct sk_security_struct *ssec;
4182 struct inode_security_struct *isec;
4183 u32 peer_sid = SECSID_NULL;
4184
4185 isec = SOCK_INODE(sock)->i_security;
4186
4187 if (isec->sclass == SECCLASS_UNIX_STREAM_SOCKET ||
4188 isec->sclass == SECCLASS_TCP_SOCKET) {
4189 ssec = sock->sk->sk_security;
4190 peer_sid = ssec->peer_sid;
4191 }
4192 if (peer_sid == SECSID_NULL) {
4193 err = -ENOPROTOOPT;
4194 goto out;
4195 }
4196
4197 err = security_sid_to_context(peer_sid, &scontext, &scontext_len);
4198
4199 if (err)
4200 goto out;
4201
4202 if (scontext_len > len) {
4203 err = -ERANGE;
4204 goto out_len;
4205 }
4206
4207 if (copy_to_user(optval, scontext, scontext_len))
4208 err = -EFAULT;
4209
4210 out_len:
4211 if (put_user(scontext_len, optlen))
4212 err = -EFAULT;
4213
4214 kfree(scontext);
4215 out:
4216 return err;
4217 }
4218
4219 static int selinux_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
4220 {
4221 u32 peer_secid = SECSID_NULL;
4222 u16 family;
4223
4224 if (skb && skb->protocol == htons(ETH_P_IP))
4225 family = PF_INET;
4226 else if (skb && skb->protocol == htons(ETH_P_IPV6))
4227 family = PF_INET6;
4228 else if (sock)
4229 family = sock->sk->sk_family;
4230 else
4231 goto out;
4232
4233 if (sock && family == PF_UNIX)
4234 selinux_inode_getsecid(SOCK_INODE(sock), &peer_secid);
4235 else if (skb)
4236 selinux_skb_peerlbl_sid(skb, family, &peer_secid);
4237
4238 out:
4239 *secid = peer_secid;
4240 if (peer_secid == SECSID_NULL)
4241 return -EINVAL;
4242 return 0;
4243 }
4244
4245 static int selinux_sk_alloc_security(struct sock *sk, int family, gfp_t priority)
4246 {
4247 return sk_alloc_security(sk, family, priority);
4248 }
4249
4250 static void selinux_sk_free_security(struct sock *sk)
4251 {
4252 sk_free_security(sk);
4253 }
4254
4255 static void selinux_sk_clone_security(const struct sock *sk, struct sock *newsk)
4256 {
4257 struct sk_security_struct *ssec = sk->sk_security;
4258 struct sk_security_struct *newssec = newsk->sk_security;
4259
4260 newssec->sid = ssec->sid;
4261 newssec->peer_sid = ssec->peer_sid;
4262 newssec->sclass = ssec->sclass;
4263
4264 selinux_netlbl_sk_security_reset(newssec, newsk->sk_family);
4265 }
4266
4267 static void selinux_sk_getsecid(struct sock *sk, u32 *secid)
4268 {
4269 if (!sk)
4270 *secid = SECINITSID_ANY_SOCKET;
4271 else {
4272 struct sk_security_struct *sksec = sk->sk_security;
4273
4274 *secid = sksec->sid;
4275 }
4276 }
4277
4278 static void selinux_sock_graft(struct sock *sk, struct socket *parent)
4279 {
4280 struct inode_security_struct *isec = SOCK_INODE(parent)->i_security;
4281 struct sk_security_struct *sksec = sk->sk_security;
4282
4283 if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6 ||
4284 sk->sk_family == PF_UNIX)
4285 isec->sid = sksec->sid;
4286 sksec->sclass = isec->sclass;
4287
4288 selinux_netlbl_sock_graft(sk, parent);
4289 }
4290
4291 static int selinux_inet_conn_request(struct sock *sk, struct sk_buff *skb,
4292 struct request_sock *req)
4293 {
4294 struct sk_security_struct *sksec = sk->sk_security;
4295 int err;
4296 u16 family = sk->sk_family;
4297 u32 newsid;
4298 u32 peersid;
4299
4300 /* handle mapped IPv4 packets arriving via IPv6 sockets */
4301 if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
4302 family = PF_INET;
4303
4304 err = selinux_skb_peerlbl_sid(skb, family, &peersid);
4305 if (err)
4306 return err;
4307 if (peersid == SECSID_NULL) {
4308 req->secid = sksec->sid;
4309 req->peer_secid = SECSID_NULL;
4310 return 0;
4311 }
4312
4313 err = security_sid_mls_copy(sksec->sid, peersid, &newsid);
4314 if (err)
4315 return err;
4316
4317 req->secid = newsid;
4318 req->peer_secid = peersid;
4319 return 0;
4320 }
4321
4322 static void selinux_inet_csk_clone(struct sock *newsk,
4323 const struct request_sock *req)
4324 {
4325 struct sk_security_struct *newsksec = newsk->sk_security;
4326
4327 newsksec->sid = req->secid;
4328 newsksec->peer_sid = req->peer_secid;
4329 /* NOTE: Ideally, we should also get the isec->sid for the
4330 new socket in sync, but we don't have the isec available yet.
4331 So we will wait until sock_graft to do it, by which
4332 time it will have been created and available. */
4333
4334 /* We don't need to take any sort of lock here as we are the only
4335 * thread with access to newsksec */
4336 selinux_netlbl_sk_security_reset(newsksec, req->rsk_ops->family);
4337 }
4338
4339 static void selinux_inet_conn_established(struct sock *sk,
4340 struct sk_buff *skb)
4341 {
4342 u16 family = sk->sk_family;
4343 struct sk_security_struct *sksec = sk->sk_security;
4344
4345 /* handle mapped IPv4 packets arriving via IPv6 sockets */
4346 if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
4347 family = PF_INET;
4348
4349 selinux_skb_peerlbl_sid(skb, family, &sksec->peer_sid);
4350 }
4351
4352 static void selinux_req_classify_flow(const struct request_sock *req,
4353 struct flowi *fl)
4354 {
4355 fl->secid = req->secid;
4356 }
4357
4358 static int selinux_nlmsg_perm(struct sock *sk, struct sk_buff *skb)
4359 {
4360 int err = 0;
4361 u32 perm;
4362 struct nlmsghdr *nlh;
4363 struct socket *sock = sk->sk_socket;
4364 struct inode_security_struct *isec = SOCK_INODE(sock)->i_security;
4365
4366 if (skb->len < NLMSG_SPACE(0)) {
4367 err = -EINVAL;
4368 goto out;
4369 }
4370 nlh = nlmsg_hdr(skb);
4371
4372 err = selinux_nlmsg_lookup(isec->sclass, nlh->nlmsg_type, &perm);
4373 if (err) {
4374 if (err == -EINVAL) {
4375 audit_log(current->audit_context, GFP_KERNEL, AUDIT_SELINUX_ERR,
4376 "SELinux: unrecognized netlink message"
4377 " type=%hu for sclass=%hu\n",
4378 nlh->nlmsg_type, isec->sclass);
4379 if (!selinux_enforcing)
4380 err = 0;
4381 }
4382
4383 /* Ignore */
4384 if (err == -ENOENT)
4385 err = 0;
4386 goto out;
4387 }
4388
4389 err = socket_has_perm(current, sock, perm);
4390 out:
4391 return err;
4392 }
4393
4394 #ifdef CONFIG_NETFILTER
4395
4396 static unsigned int selinux_ip_forward(struct sk_buff *skb, int ifindex,
4397 u16 family)
4398 {
4399 char *addrp;
4400 u32 peer_sid;
4401 struct avc_audit_data ad;
4402 u8 secmark_active;
4403 u8 peerlbl_active;
4404
4405 if (!selinux_policycap_netpeer)
4406 return NF_ACCEPT;
4407
4408 secmark_active = selinux_secmark_enabled();
4409 peerlbl_active = netlbl_enabled() || selinux_xfrm_enabled();
4410 if (!secmark_active && !peerlbl_active)
4411 return NF_ACCEPT;
4412
4413 if (selinux_skb_peerlbl_sid(skb, family, &peer_sid) != 0)
4414 return NF_DROP;
4415
4416 AVC_AUDIT_DATA_INIT(&ad, NET);
4417 ad.u.net.netif = ifindex;
4418 ad.u.net.family = family;
4419 if (selinux_parse_skb(skb, &ad, &addrp, 1, NULL) != 0)
4420 return NF_DROP;
4421
4422 if (peerlbl_active)
4423 if (selinux_inet_sys_rcv_skb(ifindex, addrp, family,
4424 peer_sid, &ad) != 0)
4425 return NF_DROP;
4426
4427 if (secmark_active)
4428 if (avc_has_perm(peer_sid, skb->secmark,
4429 SECCLASS_PACKET, PACKET__FORWARD_IN, &ad))
4430 return NF_DROP;
4431
4432 return NF_ACCEPT;
4433 }
4434
4435 static unsigned int selinux_ipv4_forward(unsigned int hooknum,
4436 struct sk_buff *skb,
4437 const struct net_device *in,
4438 const struct net_device *out,
4439 int (*okfn)(struct sk_buff *))
4440 {
4441 return selinux_ip_forward(skb, in->ifindex, PF_INET);
4442 }
4443
4444 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
4445 static unsigned int selinux_ipv6_forward(unsigned int hooknum,
4446 struct sk_buff *skb,
4447 const struct net_device *in,
4448 const struct net_device *out,
4449 int (*okfn)(struct sk_buff *))
4450 {
4451 return selinux_ip_forward(skb, in->ifindex, PF_INET6);
4452 }
4453 #endif /* IPV6 */
4454
4455 static int selinux_ip_postroute_iptables_compat(struct sock *sk,
4456 int ifindex,
4457 struct avc_audit_data *ad,
4458 u16 family, char *addrp)
4459 {
4460 int err;
4461 struct sk_security_struct *sksec = sk->sk_security;
4462 u16 sk_class;
4463 u32 netif_perm, node_perm, send_perm;
4464 u32 port_sid, node_sid, if_sid, sk_sid;
4465
4466 sk_sid = sksec->sid;
4467 sk_class = sksec->sclass;
4468
4469 switch (sk_class) {
4470 case SECCLASS_UDP_SOCKET:
4471 netif_perm = NETIF__UDP_SEND;
4472 node_perm = NODE__UDP_SEND;
4473 send_perm = UDP_SOCKET__SEND_MSG;
4474 break;
4475 case SECCLASS_TCP_SOCKET:
4476 netif_perm = NETIF__TCP_SEND;
4477 node_perm = NODE__TCP_SEND;
4478 send_perm = TCP_SOCKET__SEND_MSG;
4479 break;
4480 case SECCLASS_DCCP_SOCKET:
4481 netif_perm = NETIF__DCCP_SEND;
4482 node_perm = NODE__DCCP_SEND;
4483 send_perm = DCCP_SOCKET__SEND_MSG;
4484 break;
4485 default:
4486 netif_perm = NETIF__RAWIP_SEND;
4487 node_perm = NODE__RAWIP_SEND;
4488 send_perm = 0;
4489 break;
4490 }
4491
4492 err = sel_netif_sid(ifindex, &if_sid);
4493 if (err)
4494 return err;
4495 err = avc_has_perm(sk_sid, if_sid, SECCLASS_NETIF, netif_perm, ad);
4496 return err;
4497
4498 err = sel_netnode_sid(addrp, family, &node_sid);
4499 if (err)
4500 return err;
4501 err = avc_has_perm(sk_sid, node_sid, SECCLASS_NODE, node_perm, ad);
4502 if (err)
4503 return err;
4504
4505 if (send_perm != 0)
4506 return 0;
4507
4508 err = sel_netport_sid(sk->sk_protocol,
4509 ntohs(ad->u.net.dport), &port_sid);
4510 if (unlikely(err)) {
4511 printk(KERN_WARNING
4512 "SELinux: failure in"
4513 " selinux_ip_postroute_iptables_compat(),"
4514 " network port label not found\n");
4515 return err;
4516 }
4517 return avc_has_perm(sk_sid, port_sid, sk_class, send_perm, ad);
4518 }
4519
4520 static unsigned int selinux_ip_postroute_compat(struct sk_buff *skb,
4521 int ifindex,
4522 u16 family)
4523 {
4524 struct sock *sk = skb->sk;
4525 struct sk_security_struct *sksec;
4526 struct avc_audit_data ad;
4527 char *addrp;
4528 u8 proto;
4529
4530 if (sk == NULL)
4531 return NF_ACCEPT;
4532 sksec = sk->sk_security;
4533
4534 AVC_AUDIT_DATA_INIT(&ad, NET);
4535 ad.u.net.netif = ifindex;
4536 ad.u.net.family = family;
4537 if (selinux_parse_skb(skb, &ad, &addrp, 0, &proto))
4538 return NF_DROP;
4539
4540 if (selinux_compat_net) {
4541 if (selinux_ip_postroute_iptables_compat(skb->sk, ifindex,
4542 &ad, family, addrp))
4543 return NF_DROP;
4544 } else {
4545 if (avc_has_perm(sksec->sid, skb->secmark,
4546 SECCLASS_PACKET, PACKET__SEND, &ad))
4547 return NF_DROP;
4548 }
4549
4550 if (selinux_policycap_netpeer)
4551 if (selinux_xfrm_postroute_last(sksec->sid, skb, &ad, proto))
4552 return NF_DROP;
4553
4554 return NF_ACCEPT;
4555 }
4556
4557 static unsigned int selinux_ip_postroute(struct sk_buff *skb, int ifindex,
4558 u16 family)
4559 {
4560 u32 secmark_perm;
4561 u32 peer_sid;
4562 struct sock *sk;
4563 struct avc_audit_data ad;
4564 char *addrp;
4565 u8 secmark_active;
4566 u8 peerlbl_active;
4567
4568 /* If any sort of compatibility mode is enabled then handoff processing
4569 * to the selinux_ip_postroute_compat() function to deal with the
4570 * special handling. We do this in an attempt to keep this function
4571 * as fast and as clean as possible. */
4572 if (selinux_compat_net || !selinux_policycap_netpeer)
4573 return selinux_ip_postroute_compat(skb, ifindex, family);
4574
4575 /* If skb->dst->xfrm is non-NULL then the packet is undergoing an IPsec
4576 * packet transformation so allow the packet to pass without any checks
4577 * since we'll have another chance to perform access control checks
4578 * when the packet is on it's final way out.
4579 * NOTE: there appear to be some IPv6 multicast cases where skb->dst
4580 * is NULL, in this case go ahead and apply access control. */
4581 if (skb->dst != NULL && skb->dst->xfrm != NULL)
4582 return NF_ACCEPT;
4583
4584 secmark_active = selinux_secmark_enabled();
4585 peerlbl_active = netlbl_enabled() || selinux_xfrm_enabled();
4586 if (!secmark_active && !peerlbl_active)
4587 return NF_ACCEPT;
4588
4589 /* if the packet is being forwarded then get the peer label from the
4590 * packet itself; otherwise check to see if it is from a local
4591 * application or the kernel, if from an application get the peer label
4592 * from the sending socket, otherwise use the kernel's sid */
4593 sk = skb->sk;
4594 if (sk == NULL) {
4595 switch (family) {
4596 case PF_INET:
4597 if (IPCB(skb)->flags & IPSKB_FORWARDED)
4598 secmark_perm = PACKET__FORWARD_OUT;
4599 else
4600 secmark_perm = PACKET__SEND;
4601 break;
4602 case PF_INET6:
4603 if (IP6CB(skb)->flags & IP6SKB_FORWARDED)
4604 secmark_perm = PACKET__FORWARD_OUT;
4605 else
4606 secmark_perm = PACKET__SEND;
4607 break;
4608 default:
4609 return NF_DROP;
4610 }
4611 if (secmark_perm == PACKET__FORWARD_OUT) {
4612 if (selinux_skb_peerlbl_sid(skb, family, &peer_sid))
4613 return NF_DROP;
4614 } else
4615 peer_sid = SECINITSID_KERNEL;
4616 } else {
4617 struct sk_security_struct *sksec = sk->sk_security;
4618 peer_sid = sksec->sid;
4619 secmark_perm = PACKET__SEND;
4620 }
4621
4622 AVC_AUDIT_DATA_INIT(&ad, NET);
4623 ad.u.net.netif = ifindex;
4624 ad.u.net.family = family;
4625 if (selinux_parse_skb(skb, &ad, &addrp, 0, NULL))
4626 return NF_DROP;
4627
4628 if (secmark_active)
4629 if (avc_has_perm(peer_sid, skb->secmark,
4630 SECCLASS_PACKET, secmark_perm, &ad))
4631 return NF_DROP;
4632
4633 if (peerlbl_active) {
4634 u32 if_sid;
4635 u32 node_sid;
4636
4637 if (sel_netif_sid(ifindex, &if_sid))
4638 return NF_DROP;
4639 if (avc_has_perm(peer_sid, if_sid,
4640 SECCLASS_NETIF, NETIF__EGRESS, &ad))
4641 return NF_DROP;
4642
4643 if (sel_netnode_sid(addrp, family, &node_sid))
4644 return NF_DROP;
4645 if (avc_has_perm(peer_sid, node_sid,
4646 SECCLASS_NODE, NODE__SENDTO, &ad))
4647 return NF_DROP;
4648 }
4649
4650 return NF_ACCEPT;
4651 }
4652
4653 static unsigned int selinux_ipv4_postroute(unsigned int hooknum,
4654 struct sk_buff *skb,
4655 const struct net_device *in,
4656 const struct net_device *out,
4657 int (*okfn)(struct sk_buff *))
4658 {
4659 return selinux_ip_postroute(skb, out->ifindex, PF_INET);
4660 }
4661
4662 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
4663 static unsigned int selinux_ipv6_postroute(unsigned int hooknum,
4664 struct sk_buff *skb,
4665 const struct net_device *in,
4666 const struct net_device *out,
4667 int (*okfn)(struct sk_buff *))
4668 {
4669 return selinux_ip_postroute(skb, out->ifindex, PF_INET6);
4670 }
4671 #endif /* IPV6 */
4672
4673 #endif /* CONFIG_NETFILTER */
4674
4675 static int selinux_netlink_send(struct sock *sk, struct sk_buff *skb)
4676 {
4677 int err;
4678
4679 err = secondary_ops->netlink_send(sk, skb);
4680 if (err)
4681 return err;
4682
4683 if (policydb_loaded_version >= POLICYDB_VERSION_NLCLASS)
4684 err = selinux_nlmsg_perm(sk, skb);
4685
4686 return err;
4687 }
4688
4689 static int selinux_netlink_recv(struct sk_buff *skb, int capability)
4690 {
4691 int err;
4692 struct avc_audit_data ad;
4693
4694 err = secondary_ops->netlink_recv(skb, capability);
4695 if (err)
4696 return err;
4697
4698 AVC_AUDIT_DATA_INIT(&ad, CAP);
4699 ad.u.cap = capability;
4700
4701 return avc_has_perm(NETLINK_CB(skb).sid, NETLINK_CB(skb).sid,
4702 SECCLASS_CAPABILITY, CAP_TO_MASK(capability), &ad);
4703 }
4704
4705 static int ipc_alloc_security(struct task_struct *task,
4706 struct kern_ipc_perm *perm,
4707 u16 sclass)
4708 {
4709 struct task_security_struct *tsec = task->security;
4710 struct ipc_security_struct *isec;
4711
4712 isec = kzalloc(sizeof(struct ipc_security_struct), GFP_KERNEL);
4713 if (!isec)
4714 return -ENOMEM;
4715
4716 isec->sclass = sclass;
4717 isec->sid = tsec->sid;
4718 perm->security = isec;
4719
4720 return 0;
4721 }
4722
4723 static void ipc_free_security(struct kern_ipc_perm *perm)
4724 {
4725 struct ipc_security_struct *isec = perm->security;
4726 perm->security = NULL;
4727 kfree(isec);
4728 }
4729
4730 static int msg_msg_alloc_security(struct msg_msg *msg)
4731 {
4732 struct msg_security_struct *msec;
4733
4734 msec = kzalloc(sizeof(struct msg_security_struct), GFP_KERNEL);
4735 if (!msec)
4736 return -ENOMEM;
4737
4738 msec->sid = SECINITSID_UNLABELED;
4739 msg->security = msec;
4740
4741 return 0;
4742 }
4743
4744 static void msg_msg_free_security(struct msg_msg *msg)
4745 {
4746 struct msg_security_struct *msec = msg->security;
4747
4748 msg->security = NULL;
4749 kfree(msec);
4750 }
4751
4752 static int ipc_has_perm(struct kern_ipc_perm *ipc_perms,
4753 u32 perms)
4754 {
4755 struct task_security_struct *tsec;
4756 struct ipc_security_struct *isec;
4757 struct avc_audit_data ad;
4758
4759 tsec = current->security;
4760 isec = ipc_perms->security;
4761
4762 AVC_AUDIT_DATA_INIT(&ad, IPC);
4763 ad.u.ipc_id = ipc_perms->key;
4764
4765 return avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, &ad);
4766 }
4767
4768 static int selinux_msg_msg_alloc_security(struct msg_msg *msg)
4769 {
4770 return msg_msg_alloc_security(msg);
4771 }
4772
4773 static void selinux_msg_msg_free_security(struct msg_msg *msg)
4774 {
4775 msg_msg_free_security(msg);
4776 }
4777
4778 /* message queue security operations */
4779 static int selinux_msg_queue_alloc_security(struct msg_queue *msq)
4780 {
4781 struct task_security_struct *tsec;
4782 struct ipc_security_struct *isec;
4783 struct avc_audit_data ad;
4784 int rc;
4785
4786 rc = ipc_alloc_security(current, &msq->q_perm, SECCLASS_MSGQ);
4787 if (rc)
4788 return rc;
4789
4790 tsec = current->security;
4791 isec = msq->q_perm.security;
4792
4793 AVC_AUDIT_DATA_INIT(&ad, IPC);
4794 ad.u.ipc_id = msq->q_perm.key;
4795
4796 rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_MSGQ,
4797 MSGQ__CREATE, &ad);
4798 if (rc) {
4799 ipc_free_security(&msq->q_perm);
4800 return rc;
4801 }
4802 return 0;
4803 }
4804
4805 static void selinux_msg_queue_free_security(struct msg_queue *msq)
4806 {
4807 ipc_free_security(&msq->q_perm);
4808 }
4809
4810 static int selinux_msg_queue_associate(struct msg_queue *msq, int msqflg)
4811 {
4812 struct task_security_struct *tsec;
4813 struct ipc_security_struct *isec;
4814 struct avc_audit_data ad;
4815
4816 tsec = current->security;
4817 isec = msq->q_perm.security;
4818
4819 AVC_AUDIT_DATA_INIT(&ad, IPC);
4820 ad.u.ipc_id = msq->q_perm.key;
4821
4822 return avc_has_perm(tsec->sid, isec->sid, SECCLASS_MSGQ,
4823 MSGQ__ASSOCIATE, &ad);
4824 }
4825
4826 static int selinux_msg_queue_msgctl(struct msg_queue *msq, int cmd)
4827 {
4828 int err;
4829 int perms;
4830
4831 switch (cmd) {
4832 case IPC_INFO:
4833 case MSG_INFO:
4834 /* No specific object, just general system-wide information. */
4835 return task_has_system(current, SYSTEM__IPC_INFO);
4836 case IPC_STAT:
4837 case MSG_STAT:
4838 perms = MSGQ__GETATTR | MSGQ__ASSOCIATE;
4839 break;
4840 case IPC_SET:
4841 perms = MSGQ__SETATTR;
4842 break;
4843 case IPC_RMID:
4844 perms = MSGQ__DESTROY;
4845 break;
4846 default:
4847 return 0;
4848 }
4849
4850 err = ipc_has_perm(&msq->q_perm, perms);
4851 return err;
4852 }
4853
4854 static int selinux_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, int msqflg)
4855 {
4856 struct task_security_struct *tsec;
4857 struct ipc_security_struct *isec;
4858 struct msg_security_struct *msec;
4859 struct avc_audit_data ad;
4860 int rc;
4861
4862 tsec = current->security;
4863 isec = msq->q_perm.security;
4864 msec = msg->security;
4865
4866 /*
4867 * First time through, need to assign label to the message
4868 */
4869 if (msec->sid == SECINITSID_UNLABELED) {
4870 /*
4871 * Compute new sid based on current process and
4872 * message queue this message will be stored in
4873 */
4874 rc = security_transition_sid(tsec->sid,
4875 isec->sid,
4876 SECCLASS_MSG,
4877 &msec->sid);
4878 if (rc)
4879 return rc;
4880 }
4881
4882 AVC_AUDIT_DATA_INIT(&ad, IPC);
4883 ad.u.ipc_id = msq->q_perm.key;
4884
4885 /* Can this process write to the queue? */
4886 rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_MSGQ,
4887 MSGQ__WRITE, &ad);
4888 if (!rc)
4889 /* Can this process send the message */
4890 rc = avc_has_perm(tsec->sid, msec->sid,
4891 SECCLASS_MSG, MSG__SEND, &ad);
4892 if (!rc)
4893 /* Can the message be put in the queue? */
4894 rc = avc_has_perm(msec->sid, isec->sid,
4895 SECCLASS_MSGQ, MSGQ__ENQUEUE, &ad);
4896
4897 return rc;
4898 }
4899
4900 static int selinux_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
4901 struct task_struct *target,
4902 long type, int mode)
4903 {
4904 struct task_security_struct *tsec;
4905 struct ipc_security_struct *isec;
4906 struct msg_security_struct *msec;
4907 struct avc_audit_data ad;
4908 int rc;
4909
4910 tsec = target->security;
4911 isec = msq->q_perm.security;
4912 msec = msg->security;
4913
4914 AVC_AUDIT_DATA_INIT(&ad, IPC);
4915 ad.u.ipc_id = msq->q_perm.key;
4916
4917 rc = avc_has_perm(tsec->sid, isec->sid,
4918 SECCLASS_MSGQ, MSGQ__READ, &ad);
4919 if (!rc)
4920 rc = avc_has_perm(tsec->sid, msec->sid,
4921 SECCLASS_MSG, MSG__RECEIVE, &ad);
4922 return rc;
4923 }
4924
4925 /* Shared Memory security operations */
4926 static int selinux_shm_alloc_security(struct shmid_kernel *shp)
4927 {
4928 struct task_security_struct *tsec;
4929 struct ipc_security_struct *isec;
4930 struct avc_audit_data ad;
4931 int rc;
4932
4933 rc = ipc_alloc_security(current, &shp->shm_perm, SECCLASS_SHM);
4934 if (rc)
4935 return rc;
4936
4937 tsec = current->security;
4938 isec = shp->shm_perm.security;
4939
4940 AVC_AUDIT_DATA_INIT(&ad, IPC);
4941 ad.u.ipc_id = shp->shm_perm.key;
4942
4943 rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_SHM,
4944 SHM__CREATE, &ad);
4945 if (rc) {
4946 ipc_free_security(&shp->shm_perm);
4947 return rc;
4948 }
4949 return 0;
4950 }
4951
4952 static void selinux_shm_free_security(struct shmid_kernel *shp)
4953 {
4954 ipc_free_security(&shp->shm_perm);
4955 }
4956
4957 static int selinux_shm_associate(struct shmid_kernel *shp, int shmflg)
4958 {
4959 struct task_security_struct *tsec;
4960 struct ipc_security_struct *isec;
4961 struct avc_audit_data ad;
4962
4963 tsec = current->security;
4964 isec = shp->shm_perm.security;
4965
4966 AVC_AUDIT_DATA_INIT(&ad, IPC);
4967 ad.u.ipc_id = shp->shm_perm.key;
4968
4969 return avc_has_perm(tsec->sid, isec->sid, SECCLASS_SHM,
4970 SHM__ASSOCIATE, &ad);
4971 }
4972
4973 /* Note, at this point, shp is locked down */
4974 static int selinux_shm_shmctl(struct shmid_kernel *shp, int cmd)
4975 {
4976 int perms;
4977 int err;
4978
4979 switch (cmd) {
4980 case IPC_INFO:
4981 case SHM_INFO:
4982 /* No specific object, just general system-wide information. */
4983 return task_has_system(current, SYSTEM__IPC_INFO);
4984 case IPC_STAT:
4985 case SHM_STAT:
4986 perms = SHM__GETATTR | SHM__ASSOCIATE;
4987 break;
4988 case IPC_SET:
4989 perms = SHM__SETATTR;
4990 break;
4991 case SHM_LOCK:
4992 case SHM_UNLOCK:
4993 perms = SHM__LOCK;
4994 break;
4995 case IPC_RMID:
4996 perms = SHM__DESTROY;
4997 break;
4998 default:
4999 return 0;
5000 }
5001
5002 err = ipc_has_perm(&shp->shm_perm, perms);
5003 return err;
5004 }
5005
5006 static int selinux_shm_shmat(struct shmid_kernel *shp,
5007 char __user *shmaddr, int shmflg)
5008 {
5009 u32 perms;
5010 int rc;
5011
5012 rc = secondary_ops->shm_shmat(shp, shmaddr, shmflg);
5013 if (rc)
5014 return rc;
5015
5016 if (shmflg & SHM_RDONLY)
5017 perms = SHM__READ;
5018 else
5019 perms = SHM__READ | SHM__WRITE;
5020
5021 return ipc_has_perm(&shp->shm_perm, perms);
5022 }
5023
5024 /* Semaphore security operations */
5025 static int selinux_sem_alloc_security(struct sem_array *sma)
5026 {
5027 struct task_security_struct *tsec;
5028 struct ipc_security_struct *isec;
5029 struct avc_audit_data ad;
5030 int rc;
5031
5032 rc = ipc_alloc_security(current, &sma->sem_perm, SECCLASS_SEM);
5033 if (rc)
5034 return rc;
5035
5036 tsec = current->security;
5037 isec = sma->sem_perm.security;
5038
5039 AVC_AUDIT_DATA_INIT(&ad, IPC);
5040 ad.u.ipc_id = sma->sem_perm.key;
5041
5042 rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_SEM,
5043 SEM__CREATE, &ad);
5044 if (rc) {
5045 ipc_free_security(&sma->sem_perm);
5046 return rc;
5047 }
5048 return 0;
5049 }
5050
5051 static void selinux_sem_free_security(struct sem_array *sma)
5052 {
5053 ipc_free_security(&sma->sem_perm);
5054 }
5055
5056 static int selinux_sem_associate(struct sem_array *sma, int semflg)
5057 {
5058 struct task_security_struct *tsec;
5059 struct ipc_security_struct *isec;
5060 struct avc_audit_data ad;
5061
5062 tsec = current->security;
5063 isec = sma->sem_perm.security;
5064
5065 AVC_AUDIT_DATA_INIT(&ad, IPC);
5066 ad.u.ipc_id = sma->sem_perm.key;
5067
5068 return avc_has_perm(tsec->sid, isec->sid, SECCLASS_SEM,
5069 SEM__ASSOCIATE, &ad);
5070 }
5071
5072 /* Note, at this point, sma is locked down */
5073 static int selinux_sem_semctl(struct sem_array *sma, int cmd)
5074 {
5075 int err;
5076 u32 perms;
5077
5078 switch (cmd) {
5079 case IPC_INFO:
5080 case SEM_INFO:
5081 /* No specific object, just general system-wide information. */
5082 return task_has_system(current, SYSTEM__IPC_INFO);
5083 case GETPID:
5084 case GETNCNT:
5085 case GETZCNT:
5086 perms = SEM__GETATTR;
5087 break;
5088 case GETVAL:
5089 case GETALL:
5090 perms = SEM__READ;
5091 break;
5092 case SETVAL:
5093 case SETALL:
5094 perms = SEM__WRITE;
5095 break;
5096 case IPC_RMID:
5097 perms = SEM__DESTROY;
5098 break;
5099 case IPC_SET:
5100 perms = SEM__SETATTR;
5101 break;
5102 case IPC_STAT:
5103 case SEM_STAT:
5104 perms = SEM__GETATTR | SEM__ASSOCIATE;
5105 break;
5106 default:
5107 return 0;
5108 }
5109
5110 err = ipc_has_perm(&sma->sem_perm, perms);
5111 return err;
5112 }
5113
5114 static int selinux_sem_semop(struct sem_array *sma,
5115 struct sembuf *sops, unsigned nsops, int alter)
5116 {
5117 u32 perms;
5118
5119 if (alter)
5120 perms = SEM__READ | SEM__WRITE;
5121 else
5122 perms = SEM__READ;
5123
5124 return ipc_has_perm(&sma->sem_perm, perms);
5125 }
5126
5127 static int selinux_ipc_permission(struct kern_ipc_perm *ipcp, short flag)
5128 {
5129 u32 av = 0;
5130
5131 av = 0;
5132 if (flag & S_IRUGO)
5133 av |= IPC__UNIX_READ;
5134 if (flag & S_IWUGO)
5135 av |= IPC__UNIX_WRITE;
5136
5137 if (av == 0)
5138 return 0;
5139
5140 return ipc_has_perm(ipcp, av);
5141 }
5142
5143 static void selinux_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid)
5144 {
5145 struct ipc_security_struct *isec = ipcp->security;
5146 *secid = isec->sid;
5147 }
5148
5149 static void selinux_d_instantiate(struct dentry *dentry, struct inode *inode)
5150 {
5151 if (inode)
5152 inode_doinit_with_dentry(inode, dentry);
5153 }
5154
5155 static int selinux_getprocattr(struct task_struct *p,
5156 char *name, char **value)
5157 {
5158 struct task_security_struct *tsec;
5159 u32 sid;
5160 int error;
5161 unsigned len;
5162
5163 if (current != p) {
5164 error = task_has_perm(current, p, PROCESS__GETATTR);
5165 if (error)
5166 return error;
5167 }
5168
5169 tsec = p->security;
5170
5171 if (!strcmp(name, "current"))
5172 sid = tsec->sid;
5173 else if (!strcmp(name, "prev"))
5174 sid = tsec->osid;
5175 else if (!strcmp(name, "exec"))
5176 sid = tsec->exec_sid;
5177 else if (!strcmp(name, "fscreate"))
5178 sid = tsec->create_sid;
5179 else if (!strcmp(name, "keycreate"))
5180 sid = tsec->keycreate_sid;
5181 else if (!strcmp(name, "sockcreate"))
5182 sid = tsec->sockcreate_sid;
5183 else
5184 return -EINVAL;
5185
5186 if (!sid)
5187 return 0;
5188
5189 error = security_sid_to_context(sid, value, &len);
5190 if (error)
5191 return error;
5192 return len;
5193 }
5194
5195 static int selinux_setprocattr(struct task_struct *p,
5196 char *name, void *value, size_t size)
5197 {
5198 struct task_security_struct *tsec;
5199 struct task_struct *tracer;
5200 u32 sid = 0;
5201 int error;
5202 char *str = value;
5203
5204 if (current != p) {
5205 /* SELinux only allows a process to change its own
5206 security attributes. */
5207 return -EACCES;
5208 }
5209
5210 /*
5211 * Basic control over ability to set these attributes at all.
5212 * current == p, but we'll pass them separately in case the
5213 * above restriction is ever removed.
5214 */
5215 if (!strcmp(name, "exec"))
5216 error = task_has_perm(current, p, PROCESS__SETEXEC);
5217 else if (!strcmp(name, "fscreate"))
5218 error = task_has_perm(current, p, PROCESS__SETFSCREATE);
5219 else if (!strcmp(name, "keycreate"))
5220 error = task_has_perm(current, p, PROCESS__SETKEYCREATE);
5221 else if (!strcmp(name, "sockcreate"))
5222 error = task_has_perm(current, p, PROCESS__SETSOCKCREATE);
5223 else if (!strcmp(name, "current"))
5224 error = task_has_perm(current, p, PROCESS__SETCURRENT);
5225 else
5226 error = -EINVAL;
5227 if (error)
5228 return error;
5229
5230 /* Obtain a SID for the context, if one was specified. */
5231 if (size && str[1] && str[1] != '\n') {
5232 if (str[size-1] == '\n') {
5233 str[size-1] = 0;
5234 size--;
5235 }
5236 error = security_context_to_sid(value, size, &sid);
5237 if (error == -EINVAL && !strcmp(name, "fscreate")) {
5238 if (!capable(CAP_MAC_ADMIN))
5239 return error;
5240 error = security_context_to_sid_force(value, size,
5241 &sid);
5242 }
5243 if (error)
5244 return error;
5245 }
5246
5247 /* Permission checking based on the specified context is
5248 performed during the actual operation (execve,
5249 open/mkdir/...), when we know the full context of the
5250 operation. See selinux_bprm_set_security for the execve
5251 checks and may_create for the file creation checks. The
5252 operation will then fail if the context is not permitted. */
5253 tsec = p->security;
5254 if (!strcmp(name, "exec"))
5255 tsec->exec_sid = sid;
5256 else if (!strcmp(name, "fscreate"))
5257 tsec->create_sid = sid;
5258 else if (!strcmp(name, "keycreate")) {
5259 error = may_create_key(sid, p);
5260 if (error)
5261 return error;
5262 tsec->keycreate_sid = sid;
5263 } else if (!strcmp(name, "sockcreate"))
5264 tsec->sockcreate_sid = sid;
5265 else if (!strcmp(name, "current")) {
5266 struct av_decision avd;
5267
5268 if (sid == 0)
5269 return -EINVAL;
5270
5271 /* Only allow single threaded processes to change context */
5272 if (atomic_read(&p->mm->mm_users) != 1) {
5273 struct task_struct *g, *t;
5274 struct mm_struct *mm = p->mm;
5275 read_lock(&tasklist_lock);
5276 do_each_thread(g, t) {
5277 if (t->mm == mm && t != p) {
5278 read_unlock(&tasklist_lock);
5279 return -EPERM;
5280 }
5281 } while_each_thread(g, t);
5282 read_unlock(&tasklist_lock);
5283 }
5284
5285 /* Check permissions for the transition. */
5286 error = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS,
5287 PROCESS__DYNTRANSITION, NULL);
5288 if (error)
5289 return error;
5290
5291 /* Check for ptracing, and update the task SID if ok.
5292 Otherwise, leave SID unchanged and fail. */
5293 task_lock(p);
5294 rcu_read_lock();
5295 tracer = tracehook_tracer_task(p);
5296 if (tracer != NULL) {
5297 struct task_security_struct *ptsec = tracer->security;
5298 u32 ptsid = ptsec->sid;
5299 rcu_read_unlock();
5300 error = avc_has_perm_noaudit(ptsid, sid,
5301 SECCLASS_PROCESS,
5302 PROCESS__PTRACE, 0, &avd);
5303 if (!error)
5304 tsec->sid = sid;
5305 task_unlock(p);
5306 avc_audit(ptsid, sid, SECCLASS_PROCESS,
5307 PROCESS__PTRACE, &avd, error, NULL);
5308 if (error)
5309 return error;
5310 } else {
5311 rcu_read_unlock();
5312 tsec->sid = sid;
5313 task_unlock(p);
5314 }
5315 } else
5316 return -EINVAL;
5317
5318 return size;
5319 }
5320
5321 static int selinux_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
5322 {
5323 return security_sid_to_context(secid, secdata, seclen);
5324 }
5325
5326 static int selinux_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
5327 {
5328 return security_context_to_sid(secdata, seclen, secid);
5329 }
5330
5331 static void selinux_release_secctx(char *secdata, u32 seclen)
5332 {
5333 kfree(secdata);
5334 }
5335
5336 #ifdef CONFIG_KEYS
5337
5338 static int selinux_key_alloc(struct key *k, struct task_struct *tsk,
5339 unsigned long flags)
5340 {
5341 struct task_security_struct *tsec = tsk->security;
5342 struct key_security_struct *ksec;
5343
5344 ksec = kzalloc(sizeof(struct key_security_struct), GFP_KERNEL);
5345 if (!ksec)
5346 return -ENOMEM;
5347
5348 if (tsec->keycreate_sid)
5349 ksec->sid = tsec->keycreate_sid;
5350 else
5351 ksec->sid = tsec->sid;
5352 k->security = ksec;
5353
5354 return 0;
5355 }
5356
5357 static void selinux_key_free(struct key *k)
5358 {
5359 struct key_security_struct *ksec = k->security;
5360
5361 k->security = NULL;
5362 kfree(ksec);
5363 }
5364
5365 static int selinux_key_permission(key_ref_t key_ref,
5366 struct task_struct *ctx,
5367 key_perm_t perm)
5368 {
5369 struct key *key;
5370 struct task_security_struct *tsec;
5371 struct key_security_struct *ksec;
5372
5373 key = key_ref_to_ptr(key_ref);
5374
5375 tsec = ctx->security;
5376 ksec = key->security;
5377
5378 /* if no specific permissions are requested, we skip the
5379 permission check. No serious, additional covert channels
5380 appear to be created. */
5381 if (perm == 0)
5382 return 0;
5383
5384 return avc_has_perm(tsec->sid, ksec->sid,
5385 SECCLASS_KEY, perm, NULL);
5386 }
5387
5388 static int selinux_key_getsecurity(struct key *key, char **_buffer)
5389 {
5390 struct key_security_struct *ksec = key->security;
5391 char *context = NULL;
5392 unsigned len;
5393 int rc;
5394
5395 rc = security_sid_to_context(ksec->sid, &context, &len);
5396 if (!rc)
5397 rc = len;
5398 *_buffer = context;
5399 return rc;
5400 }
5401
5402 #endif
5403
5404 static struct security_operations selinux_ops = {
5405 .name = "selinux",
5406
5407 .ptrace_may_access = selinux_ptrace_may_access,
5408 .ptrace_traceme = selinux_ptrace_traceme,
5409 .capget = selinux_capget,
5410 .capset_check = selinux_capset_check,
5411 .capset_set = selinux_capset_set,
5412 .sysctl = selinux_sysctl,
5413 .capable = selinux_capable,
5414 .quotactl = selinux_quotactl,
5415 .quota_on = selinux_quota_on,
5416 .syslog = selinux_syslog,
5417 .vm_enough_memory = selinux_vm_enough_memory,
5418
5419 .netlink_send = selinux_netlink_send,
5420 .netlink_recv = selinux_netlink_recv,
5421
5422 .bprm_alloc_security = selinux_bprm_alloc_security,
5423 .bprm_free_security = selinux_bprm_free_security,
5424 .bprm_apply_creds = selinux_bprm_apply_creds,
5425 .bprm_post_apply_creds = selinux_bprm_post_apply_creds,
5426 .bprm_set_security = selinux_bprm_set_security,
5427 .bprm_check_security = selinux_bprm_check_security,
5428 .bprm_secureexec = selinux_bprm_secureexec,
5429
5430 .sb_alloc_security = selinux_sb_alloc_security,
5431 .sb_free_security = selinux_sb_free_security,
5432 .sb_copy_data = selinux_sb_copy_data,
5433 .sb_kern_mount = selinux_sb_kern_mount,
5434 .sb_show_options = selinux_sb_show_options,
5435 .sb_statfs = selinux_sb_statfs,
5436 .sb_mount = selinux_mount,
5437 .sb_umount = selinux_umount,
5438 .sb_set_mnt_opts = selinux_set_mnt_opts,
5439 .sb_clone_mnt_opts = selinux_sb_clone_mnt_opts,
5440 .sb_parse_opts_str = selinux_parse_opts_str,
5441
5442
5443 .inode_alloc_security = selinux_inode_alloc_security,
5444 .inode_free_security = selinux_inode_free_security,
5445 .inode_init_security = selinux_inode_init_security,
5446 .inode_create = selinux_inode_create,
5447 .inode_link = selinux_inode_link,
5448 .inode_unlink = selinux_inode_unlink,
5449 .inode_symlink = selinux_inode_symlink,
5450 .inode_mkdir = selinux_inode_mkdir,
5451 .inode_rmdir = selinux_inode_rmdir,
5452 .inode_mknod = selinux_inode_mknod,
5453 .inode_rename = selinux_inode_rename,
5454 .inode_readlink = selinux_inode_readlink,
5455 .inode_follow_link = selinux_inode_follow_link,
5456 .inode_permission = selinux_inode_permission,
5457 .inode_setattr = selinux_inode_setattr,
5458 .inode_getattr = selinux_inode_getattr,
5459 .inode_setxattr = selinux_inode_setxattr,
5460 .inode_post_setxattr = selinux_inode_post_setxattr,
5461 .inode_getxattr = selinux_inode_getxattr,
5462 .inode_listxattr = selinux_inode_listxattr,
5463 .inode_removexattr = selinux_inode_removexattr,
5464 .inode_getsecurity = selinux_inode_getsecurity,
5465 .inode_setsecurity = selinux_inode_setsecurity,
5466 .inode_listsecurity = selinux_inode_listsecurity,
5467 .inode_need_killpriv = selinux_inode_need_killpriv,
5468 .inode_killpriv = selinux_inode_killpriv,
5469 .inode_getsecid = selinux_inode_getsecid,
5470
5471 .file_permission = selinux_file_permission,
5472 .file_alloc_security = selinux_file_alloc_security,
5473 .file_free_security = selinux_file_free_security,
5474 .file_ioctl = selinux_file_ioctl,
5475 .file_mmap = selinux_file_mmap,
5476 .file_mprotect = selinux_file_mprotect,
5477 .file_lock = selinux_file_lock,
5478 .file_fcntl = selinux_file_fcntl,
5479 .file_set_fowner = selinux_file_set_fowner,
5480 .file_send_sigiotask = selinux_file_send_sigiotask,
5481 .file_receive = selinux_file_receive,
5482
5483 .dentry_open = selinux_dentry_open,
5484
5485 .task_create = selinux_task_create,
5486 .task_alloc_security = selinux_task_alloc_security,
5487 .task_free_security = selinux_task_free_security,
5488 .task_setuid = selinux_task_setuid,
5489 .task_post_setuid = selinux_task_post_setuid,
5490 .task_setgid = selinux_task_setgid,
5491 .task_setpgid = selinux_task_setpgid,
5492 .task_getpgid = selinux_task_getpgid,
5493 .task_getsid = selinux_task_getsid,
5494 .task_getsecid = selinux_task_getsecid,
5495 .task_setgroups = selinux_task_setgroups,
5496 .task_setnice = selinux_task_setnice,
5497 .task_setioprio = selinux_task_setioprio,
5498 .task_getioprio = selinux_task_getioprio,
5499 .task_setrlimit = selinux_task_setrlimit,
5500 .task_setscheduler = selinux_task_setscheduler,
5501 .task_getscheduler = selinux_task_getscheduler,
5502 .task_movememory = selinux_task_movememory,
5503 .task_kill = selinux_task_kill,
5504 .task_wait = selinux_task_wait,
5505 .task_prctl = selinux_task_prctl,
5506 .task_reparent_to_init = selinux_task_reparent_to_init,
5507 .task_to_inode = selinux_task_to_inode,
5508
5509 .ipc_permission = selinux_ipc_permission,
5510 .ipc_getsecid = selinux_ipc_getsecid,
5511
5512 .msg_msg_alloc_security = selinux_msg_msg_alloc_security,
5513 .msg_msg_free_security = selinux_msg_msg_free_security,
5514
5515 .msg_queue_alloc_security = selinux_msg_queue_alloc_security,
5516 .msg_queue_free_security = selinux_msg_queue_free_security,
5517 .msg_queue_associate = selinux_msg_queue_associate,
5518 .msg_queue_msgctl = selinux_msg_queue_msgctl,
5519 .msg_queue_msgsnd = selinux_msg_queue_msgsnd,
5520 .msg_queue_msgrcv = selinux_msg_queue_msgrcv,
5521
5522 .shm_alloc_security = selinux_shm_alloc_security,
5523 .shm_free_security = selinux_shm_free_security,
5524 .shm_associate = selinux_shm_associate,
5525 .shm_shmctl = selinux_shm_shmctl,
5526 .shm_shmat = selinux_shm_shmat,
5527
5528 .sem_alloc_security = selinux_sem_alloc_security,
5529 .sem_free_security = selinux_sem_free_security,
5530 .sem_associate = selinux_sem_associate,
5531 .sem_semctl = selinux_sem_semctl,
5532 .sem_semop = selinux_sem_semop,
5533
5534 .d_instantiate = selinux_d_instantiate,
5535
5536 .getprocattr = selinux_getprocattr,
5537 .setprocattr = selinux_setprocattr,
5538
5539 .secid_to_secctx = selinux_secid_to_secctx,
5540 .secctx_to_secid = selinux_secctx_to_secid,
5541 .release_secctx = selinux_release_secctx,
5542
5543 .unix_stream_connect = selinux_socket_unix_stream_connect,
5544 .unix_may_send = selinux_socket_unix_may_send,
5545
5546 .socket_create = selinux_socket_create,
5547 .socket_post_create = selinux_socket_post_create,
5548 .socket_bind = selinux_socket_bind,
5549 .socket_connect = selinux_socket_connect,
5550 .socket_listen = selinux_socket_listen,
5551 .socket_accept = selinux_socket_accept,
5552 .socket_sendmsg = selinux_socket_sendmsg,
5553 .socket_recvmsg = selinux_socket_recvmsg,
5554 .socket_getsockname = selinux_socket_getsockname,
5555 .socket_getpeername = selinux_socket_getpeername,
5556 .socket_getsockopt = selinux_socket_getsockopt,
5557 .socket_setsockopt = selinux_socket_setsockopt,
5558 .socket_shutdown = selinux_socket_shutdown,
5559 .socket_sock_rcv_skb = selinux_socket_sock_rcv_skb,
5560 .socket_getpeersec_stream = selinux_socket_getpeersec_stream,
5561 .socket_getpeersec_dgram = selinux_socket_getpeersec_dgram,
5562 .sk_alloc_security = selinux_sk_alloc_security,
5563 .sk_free_security = selinux_sk_free_security,
5564 .sk_clone_security = selinux_sk_clone_security,
5565 .sk_getsecid = selinux_sk_getsecid,
5566 .sock_graft = selinux_sock_graft,
5567 .inet_conn_request = selinux_inet_conn_request,
5568 .inet_csk_clone = selinux_inet_csk_clone,
5569 .inet_conn_established = selinux_inet_conn_established,
5570 .req_classify_flow = selinux_req_classify_flow,
5571
5572 #ifdef CONFIG_SECURITY_NETWORK_XFRM
5573 .xfrm_policy_alloc_security = selinux_xfrm_policy_alloc,
5574 .xfrm_policy_clone_security = selinux_xfrm_policy_clone,
5575 .xfrm_policy_free_security = selinux_xfrm_policy_free,
5576 .xfrm_policy_delete_security = selinux_xfrm_policy_delete,
5577 .xfrm_state_alloc_security = selinux_xfrm_state_alloc,
5578 .xfrm_state_free_security = selinux_xfrm_state_free,
5579 .xfrm_state_delete_security = selinux_xfrm_state_delete,
5580 .xfrm_policy_lookup = selinux_xfrm_policy_lookup,
5581 .xfrm_state_pol_flow_match = selinux_xfrm_state_pol_flow_match,
5582 .xfrm_decode_session = selinux_xfrm_decode_session,
5583 #endif
5584
5585 #ifdef CONFIG_KEYS
5586 .key_alloc = selinux_key_alloc,
5587 .key_free = selinux_key_free,
5588 .key_permission = selinux_key_permission,
5589 .key_getsecurity = selinux_key_getsecurity,
5590 #endif
5591
5592 #ifdef CONFIG_AUDIT
5593 .audit_rule_init = selinux_audit_rule_init,
5594 .audit_rule_known = selinux_audit_rule_known,
5595 .audit_rule_match = selinux_audit_rule_match,
5596 .audit_rule_free = selinux_audit_rule_free,
5597 #endif
5598 };
5599
5600 static __init int selinux_init(void)
5601 {
5602 struct task_security_struct *tsec;
5603
5604 if (!security_module_enable(&selinux_ops)) {
5605 selinux_enabled = 0;
5606 return 0;
5607 }
5608
5609 if (!selinux_enabled) {
5610 printk(KERN_INFO "SELinux: Disabled at boot.\n");
5611 return 0;
5612 }
5613
5614 printk(KERN_INFO "SELinux: Initializing.\n");
5615
5616 /* Set the security state for the initial task. */
5617 if (task_alloc_security(current))
5618 panic("SELinux: Failed to initialize initial task.\n");
5619 tsec = current->security;
5620 tsec->osid = tsec->sid = SECINITSID_KERNEL;
5621
5622 sel_inode_cache = kmem_cache_create("selinux_inode_security",
5623 sizeof(struct inode_security_struct),
5624 0, SLAB_PANIC, NULL);
5625 avc_init();
5626
5627 secondary_ops = security_ops;
5628 if (!secondary_ops)
5629 panic("SELinux: No initial security operations\n");
5630 if (register_security(&selinux_ops))
5631 panic("SELinux: Unable to register with kernel.\n");
5632
5633 if (selinux_enforcing)
5634 printk(KERN_DEBUG "SELinux: Starting in enforcing mode\n");
5635 else
5636 printk(KERN_DEBUG "SELinux: Starting in permissive mode\n");
5637
5638 return 0;
5639 }
5640
5641 void selinux_complete_init(void)
5642 {
5643 printk(KERN_DEBUG "SELinux: Completing initialization.\n");
5644
5645 /* Set up any superblocks initialized prior to the policy load. */
5646 printk(KERN_DEBUG "SELinux: Setting up existing superblocks.\n");
5647 spin_lock(&sb_lock);
5648 spin_lock(&sb_security_lock);
5649 next_sb:
5650 if (!list_empty(&superblock_security_head)) {
5651 struct superblock_security_struct *sbsec =
5652 list_entry(superblock_security_head.next,
5653 struct superblock_security_struct,
5654 list);
5655 struct super_block *sb = sbsec->sb;
5656 sb->s_count++;
5657 spin_unlock(&sb_security_lock);
5658 spin_unlock(&sb_lock);
5659 down_read(&sb->s_umount);
5660 if (sb->s_root)
5661 superblock_doinit(sb, NULL);
5662 drop_super(sb);
5663 spin_lock(&sb_lock);
5664 spin_lock(&sb_security_lock);
5665 list_del_init(&sbsec->list);
5666 goto next_sb;
5667 }
5668 spin_unlock(&sb_security_lock);
5669 spin_unlock(&sb_lock);
5670 }
5671
5672 /* SELinux requires early initialization in order to label
5673 all processes and objects when they are created. */
5674 security_initcall(selinux_init);
5675
5676 #if defined(CONFIG_NETFILTER)
5677
5678 static struct nf_hook_ops selinux_ipv4_ops[] = {
5679 {
5680 .hook = selinux_ipv4_postroute,
5681 .owner = THIS_MODULE,
5682 .pf = PF_INET,
5683 .hooknum = NF_INET_POST_ROUTING,
5684 .priority = NF_IP_PRI_SELINUX_LAST,
5685 },
5686 {
5687 .hook = selinux_ipv4_forward,
5688 .owner = THIS_MODULE,
5689 .pf = PF_INET,
5690 .hooknum = NF_INET_FORWARD,
5691 .priority = NF_IP_PRI_SELINUX_FIRST,
5692 }
5693 };
5694
5695 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
5696
5697 static struct nf_hook_ops selinux_ipv6_ops[] = {
5698 {
5699 .hook = selinux_ipv6_postroute,
5700 .owner = THIS_MODULE,
5701 .pf = PF_INET6,
5702 .hooknum = NF_INET_POST_ROUTING,
5703 .priority = NF_IP6_PRI_SELINUX_LAST,
5704 },
5705 {
5706 .hook = selinux_ipv6_forward,
5707 .owner = THIS_MODULE,
5708 .pf = PF_INET6,
5709 .hooknum = NF_INET_FORWARD,
5710 .priority = NF_IP6_PRI_SELINUX_FIRST,
5711 }
5712 };
5713
5714 #endif /* IPV6 */
5715
5716 static int __init selinux_nf_ip_init(void)
5717 {
5718 int err = 0;
5719
5720 if (!selinux_enabled)
5721 goto out;
5722
5723 printk(KERN_DEBUG "SELinux: Registering netfilter hooks\n");
5724
5725 err = nf_register_hooks(selinux_ipv4_ops, ARRAY_SIZE(selinux_ipv4_ops));
5726 if (err)
5727 panic("SELinux: nf_register_hooks for IPv4: error %d\n", err);
5728
5729 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
5730 err = nf_register_hooks(selinux_ipv6_ops, ARRAY_SIZE(selinux_ipv6_ops));
5731 if (err)
5732 panic("SELinux: nf_register_hooks for IPv6: error %d\n", err);
5733 #endif /* IPV6 */
5734
5735 out:
5736 return err;
5737 }
5738
5739 __initcall(selinux_nf_ip_init);
5740
5741 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
5742 static void selinux_nf_ip_exit(void)
5743 {
5744 printk(KERN_DEBUG "SELinux: Unregistering netfilter hooks\n");
5745
5746 nf_unregister_hooks(selinux_ipv4_ops, ARRAY_SIZE(selinux_ipv4_ops));
5747 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
5748 nf_unregister_hooks(selinux_ipv6_ops, ARRAY_SIZE(selinux_ipv6_ops));
5749 #endif /* IPV6 */
5750 }
5751 #endif
5752
5753 #else /* CONFIG_NETFILTER */
5754
5755 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
5756 #define selinux_nf_ip_exit()
5757 #endif
5758
5759 #endif /* CONFIG_NETFILTER */
5760
5761 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
5762 static int selinux_disabled;
5763
5764 int selinux_disable(void)
5765 {
5766 extern void exit_sel_fs(void);
5767
5768 if (ss_initialized) {
5769 /* Not permitted after initial policy load. */
5770 return -EINVAL;
5771 }
5772
5773 if (selinux_disabled) {
5774 /* Only do this once. */
5775 return -EINVAL;
5776 }
5777
5778 printk(KERN_INFO "SELinux: Disabled at runtime.\n");
5779
5780 selinux_disabled = 1;
5781 selinux_enabled = 0;
5782
5783 /* Reset security_ops to the secondary module, dummy or capability. */
5784 security_ops = secondary_ops;
5785
5786 /* Unregister netfilter hooks. */
5787 selinux_nf_ip_exit();
5788
5789 /* Unregister selinuxfs. */
5790 exit_sel_fs();
5791
5792 return 0;
5793 }
5794 #endif
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree