summaryrefslogtreecommitdiff
path: root/security/apparmor/lsm.c
blob: f54253258fb853691083f47e69624f4e6bbb6014 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
/*
 * AppArmor security module
 *
 * This file contains AppArmor LSM hooks.
 *
 * Copyright (C) 1998-2008 Novell/SUSE
 * Copyright 2009-2010 Canonical Ltd.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, version 2 of the
 * License.
 */

#include <linux/lsm_hooks.h>
#include <linux/moduleparam.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/ptrace.h>
#include <linux/ctype.h>
#include <linux/sysctl.h>
#include <linux/audit.h>
#include <linux/user_namespace.h>
#include <net/sock.h>

#include "include/apparmor.h"
#include "include/apparmorfs.h"
#include "include/audit.h"
#include "include/capability.h"
#include "include/context.h"
#include "include/file.h"
#include "include/ipc.h"
#include "include/path.h"
#include "include/policy.h"
#include "include/procattr.h"

/* Flag indicating whether initialization completed */
int apparmor_initialized __initdata;

/*
 * LSM hook functions
 */

/*
 * free the associated aa_task_cxt and put its profiles
 */
static void apparmor_cred_free(struct cred *cred)
{
	aa_free_task_context(cred_cxt(cred));
	cred_cxt(cred) = NULL;
}

/*
 * allocate the apparmor part of blank credentials
 */
static int apparmor_cred_alloc_blank(struct cred *cred, gfp_t gfp)
{
	/* freed by apparmor_cred_free */
	struct aa_task_cxt *cxt = aa_alloc_task_context(gfp);
	if (!cxt)
		return -ENOMEM;

	cred_cxt(cred) = cxt;
	return 0;
}

/*
 * prepare new aa_task_cxt for modification by prepare_cred block
 */
static int apparmor_cred_prepare(struct cred *new, const struct cred *old,
				 gfp_t gfp)
{
	/* freed by apparmor_cred_free */
	struct aa_task_cxt *cxt = aa_alloc_task_context(gfp);
	if (!cxt)
		return -ENOMEM;

	aa_dup_task_context(cxt, cred_cxt(old));
	cred_cxt(new) = cxt;
	return 0;
}

/*
 * transfer the apparmor data to a blank set of creds
 */
static void apparmor_cred_transfer(struct cred *new, const struct cred *old)
{
	const struct aa_task_cxt *old_cxt = cred_cxt(old);
	struct aa_task_cxt *new_cxt = cred_cxt(new);

	aa_dup_task_context(new_cxt, old_cxt);
}

static int apparmor_ptrace_access_check(struct task_struct *child,
					unsigned int mode)
{
	int error = cap_ptrace_access_check(child, mode);
	if (error)
		return error;

	return aa_ptrace(current, child, mode);
}

static int apparmor_ptrace_traceme(struct task_struct *parent)
{
	int error = cap_ptrace_traceme(parent);
	if (error)
		return error;

	return aa_ptrace(parent, current, PTRACE_MODE_ATTACH);
}

/* Derived from security/commoncap.c:cap_capget */
static int apparmor_capget(struct task_struct *target, kernel_cap_t *effective,
			   kernel_cap_t *inheritable, kernel_cap_t *permitted)
{
	struct aa_profile *profile;
	const struct cred *cred;

	rcu_read_lock();
	cred = __task_cred(target);
	profile = aa_cred_profile(cred);

	*effective = cred->cap_effective;
	*inheritable = cred->cap_inheritable;
	*permitted = cred->cap_permitted;

	if (!unconfined(profile) && !COMPLAIN_MODE(profile)) {
		*effective = cap_intersect(*effective, profile->caps.allow);
		*permitted = cap_intersect(*permitted, profile->caps.allow);
	}
	rcu_read_unlock();

	return 0;
}

static int apparmor_capable(const struct cred *cred, struct user_namespace *ns,
			    int cap, int audit)
{
	struct aa_profile *profile;
	/* cap_capable returns 0 on success, else -EPERM */
	int error = cap_capable(cred, ns, cap, audit);
	if (!error) {
		profile = aa_cred_profile(cred);
		if (!unconfined(profile))
			error = aa_capable(profile, cap, audit);
	}
	return error;
}

/**
 * common_perm - basic common permission check wrapper fn for paths
 * @op: operation being checked
 * @path: path to check permission of  (NOT NULL)
 * @mask: requested permissions mask
 * @cond: conditional info for the permission request  (NOT NULL)
 *
 * Returns: %0 else error code if error or permission denied
 */
static int common_perm(int op, struct path *path, u32 mask,
		       struct path_cond *cond)
{
	struct aa_profile *profile;
	int error = 0;

	profile = __aa_current_profile();
	if (!unconfined(profile))
		error = aa_path_perm(op, profile, path, 0, mask, cond);

	return error;
}

/**
 * common_perm_dir_dentry - common permission wrapper when path is dir, dentry
 * @op: operation being checked
 * @dir: directory of the dentry  (NOT NULL)
 * @dentry: dentry to check  (NOT NULL)
 * @mask: requested permissions mask
 * @cond: conditional info for the permission request  (NOT NULL)
 *
 * Returns: %0 else error code if error or permission denied
 */
static int common_perm_dir_dentry(int op, struct path *dir,
				  struct dentry *dentry, u32 mask,
				  struct path_cond *cond)
{
	struct path path = { dir->mnt, dentry };

	return common_perm(op, &path, mask, cond);
}

/**
 * common_perm_mnt_dentry - common permission wrapper when mnt, dentry
 * @op: operation being checked
 * @mnt: mount point of dentry (NOT NULL)
 * @dentry: dentry to check  (NOT NULL)
 * @mask: requested permissions mask
 *
 * Returns: %0 else error code if error or permission denied
 */
static int common_perm_mnt_dentry(int op, struct vfsmount *mnt,
				  struct dentry *dentry, u32 mask)
{
	struct path path = { mnt, dentry };
	struct path_cond cond = { d_backing_inode(dentry)->i_uid,
				  d_backing_inode(dentry)->i_mode
	};

	return common_perm(op, &path, mask, &cond);
}

/**
 * common_perm_rm - common permission wrapper for operations doing rm
 * @op: operation being checked
 * @dir: directory that the dentry is in  (NOT NULL)
 * @dentry: dentry being rm'd  (NOT NULL)
 * @mask: requested permission mask
 *
 * Returns: %0 else error code if error or permission denied
 */
static int common_perm_rm(int op, struct path *dir,
			  struct dentry *dentry, u32 mask)
{
	struct inode *inode = d_backing_inode(dentry);
	struct path_cond cond = { };

	if (!inode || !dir->mnt || !mediated_filesystem(dentry))
		return 0;

	cond.uid = inode->i_uid;
	cond.mode = inode->i_mode;

	return common_perm_dir_dentry(op, dir, dentry, mask, &cond);
}

/**
 * common_perm_create - common permission wrapper for operations doing create
 * @op: operation being checked
 * @dir: directory that dentry will be created in  (NOT NULL)
 * @dentry: dentry to create   (NOT NULL)
 * @mask: request permission mask
 * @mode: created file mode
 *
 * Returns: %0 else error code if error or permission denied
 */
static int common_perm_create(int op, struct path *dir, struct dentry *dentry,
			      u32 mask, umode_t mode)
{
	struct path_cond cond = { current_fsuid(), mode };

	if (!dir->mnt || !mediated_filesystem(dir->dentry))
		return 0;

	return common_perm_dir_dentry(op, dir, dentry, mask, &cond);
}

static int apparmor_path_unlink(struct path *dir, struct dentry *dentry)
{
	return common_perm_rm(OP_UNLINK, dir, dentry, AA_MAY_DELETE);
}

static int apparmor_path_mkdir(struct path *dir, struct dentry *dentry,
			       umode_t mode)
{
	return common_perm_create(OP_MKDIR, dir, dentry, AA_MAY_CREATE,
				  S_IFDIR);
}

static int apparmor_path_rmdir(struct path *dir, struct dentry *dentry)
{
	return common_perm_rm(OP_RMDIR, dir, dentry, AA_MAY_DELETE);
}

static int apparmor_path_mknod(struct path *dir, struct dentry *dentry,
			       umode_t mode, unsigned int dev)
{
	return common_perm_create(OP_MKNOD, dir, dentry, AA_MAY_CREATE, mode);
}

static int apparmor_path_truncate(struct path *path)
{
	struct path_cond cond = { d_backing_inode(path->dentry)->i_uid,
				  d_backing_inode(path->dentry)->i_mode
	};

	if (!path->mnt || !mediated_filesystem(path->dentry))
		return 0;

	return common_perm(OP_TRUNC, path, MAY_WRITE | AA_MAY_META_WRITE,
			   &cond);
}

static int apparmor_path_symlink(struct path *dir, struct dentry *dentry,
				 const char *old_name)
{
	return common_perm_create(OP_SYMLINK, dir, dentry, AA_MAY_CREATE,
				  S_IFLNK);
}

static int apparmor_path_link(struct dentry *old_dentry, struct path *new_dir,
			      struct dentry *new_dentry)
{
	struct aa_profile *profile;
	int error = 0;

	if (!mediated_filesystem(old_dentry))
		return 0;

	profile = aa_current_profile();
	if (!unconfined(profile))
		error = aa_path_link(profile, old_dentry, new_dir, new_dentry);
	return error;
}

static int apparmor_path_rename(struct path *old_dir, struct dentry *old_dentry,
				struct path *new_dir, struct dentry *new_dentry)
{
	struct aa_profile *profile;
	int error = 0;

	if (!mediated_filesystem(old_dentry))
		return 0;

	profile = aa_current_profile();
	if (!unconfined(profile)) {
		struct path old_path = { old_dir->mnt, old_dentry };
		struct path new_path = { new_dir->mnt, new_dentry };
		struct path_cond cond = { d_backing_inode(old_dentry)->i_uid,
					  d_backing_inode(old_dentry)->i_mode
		};

		error = aa_path_perm(OP_RENAME_SRC, profile, &old_path, 0,
				     MAY_READ | AA_MAY_META_READ | MAY_WRITE |
				     AA_MAY_META_WRITE | AA_MAY_DELETE,
				     &cond);
		if (!error)
			error = aa_path_perm(OP_RENAME_DEST, profile, &new_path,
					     0, MAY_WRITE | AA_MAY_META_WRITE |
					     AA_MAY_CREATE, &cond);

	}
	return error;
}

static int apparmor_path_chmod(struct path *path, umode_t mode)
{
	if (!mediated_filesystem(path->dentry))
		return 0;

	return common_perm_mnt_dentry(OP_CHMOD, path->mnt, path->dentry, AA_MAY_CHMOD);
}

static int apparmor_path_chown(struct path *path, kuid_t uid, kgid_t gid)
{
	struct path_cond cond =  { d_backing_inode(path->dentry)->i_uid,
				   d_backing_inode(path->dentry)->i_mode
	};

	if (!mediated_filesystem(path->dentry))
		return 0;

	return common_perm(OP_CHOWN, path, AA_MAY_CHOWN, &cond);
}

static int apparmor_inode_getattr(const struct path *path)
{
	if (!mediated_filesystem(path->dentry))
		return 0;

	return common_perm_mnt_dentry(OP_GETATTR, path->mnt, path->dentry,
				      AA_MAY_META_READ);
}

static int apparmor_file_open(struct file *file, const struct cred *cred)
{
	struct aa_file_cxt *fcxt = file->f_security;
	struct aa_profile *profile;
	int error = 0;

	if (!mediated_filesystem(file->f_path.dentry))
		return 0;

	/* If in exec, permission is handled by bprm hooks.
	 * Cache permissions granted by the previous exec check, with
	 * implicit read and executable mmap which are required to
	 * actually execute the image.
	 */
	if (current->in_execve) {
		fcxt->allow = MAY_EXEC | MAY_READ | AA_EXEC_MMAP;
		return 0;
	}

	profile = aa_cred_profile(cred);
	if (!unconfined(profile)) {
		struct inode *inode = file_inode(file);
		struct path_cond cond = { inode->i_uid, inode->i_mode };

		error = aa_path_perm(OP_OPEN, profile, &file->f_path, 0,
				     aa_map_file_to_perms(file), &cond);
		/* todo cache full allowed permissions set and state */
		fcxt->allow = aa_map_file_to_perms(file);
	}

	return error;
}

static int apparmor_file_alloc_security(struct file *file)
{
	/* freed by apparmor_file_free_security */
	file->f_security = aa_alloc_file_context(GFP_KERNEL);
	if (!file->f_security)
		return -ENOMEM;
	return 0;

}

static void apparmor_file_free_security(struct file *file)
{
	struct aa_file_cxt *cxt = file->f_security;

	aa_free_file_context(cxt);
}

static int common_file_perm(int op, struct file *file, u32 mask)
{
	struct aa_file_cxt *fcxt = file->f_security;
	struct aa_profile *profile, *fprofile = aa_cred_profile(file->f_cred);
	int error = 0;

	BUG_ON(!fprofile);

	if (!file->f_path.mnt ||
	    !mediated_filesystem(file->f_path.dentry))
		return 0;

	profile = __aa_current_profile();

	/* revalidate access, if task is unconfined, or the cached cred
	 * doesn't match or if the request is for more permissions than
	 * was granted.
	 *
	 * Note: the test for !unconfined(fprofile) is to handle file
	 *       delegation from unconfined tasks
	 */
	if (!unconfined(profile) && !unconfined(fprofile) &&
	    ((fprofile != profile) || (mask & ~fcxt->allow)))
		error = aa_file_perm(op, profile, file, mask);

	return error;
}

static int apparmor_file_permission(struct file *file, int mask)
{
	return common_file_perm(OP_FPERM, file, mask);
}

static int apparmor_file_lock(struct file *file, unsigned int cmd)
{
	u32 mask = AA_MAY_LOCK;

	if (cmd == F_WRLCK)
		mask |= MAY_WRITE;

	return common_file_perm(OP_FLOCK, file, mask);
}

static int common_mmap(int op, struct file *file, unsigned long prot,
		       unsigned long flags)
{
	int mask = 0;

	if (!file || !file->f_security)
		return 0;

	if (prot & PROT_READ)
		mask |= MAY_READ;
	/*
	 * Private mappings don't require write perms since they don't
	 * write back to the files
	 */
	if ((prot & PROT_WRITE) && !(flags & MAP_PRIVATE))
		mask |= MAY_WRITE;
	if (prot & PROT_EXEC)
		mask |= AA_EXEC_MMAP;

	return common_file_perm(op, file, mask);
}

static int apparmor_mmap_file(struct file *file, unsigned long reqprot,
			      unsigned long prot, unsigned long flags)
{
	return common_mmap(OP_FMMAP, file, prot, flags);
}

static int apparmor_file_mprotect(struct vm_area_struct *vma,
				  unsigned long reqprot, unsigned long prot)
{
	return common_mmap(OP_FMPROT, vma->vm_file, prot,
			   !(vma->vm_flags & VM_SHARED) ? MAP_PRIVATE : 0);
}

static int apparmor_getprocattr(struct task_struct *task, char *name,
				char **value)
{
	int error = -ENOENT;
	/* released below */
	const struct cred *cred = get_task_cred(task);
	struct aa_task_cxt *cxt = cred_cxt(cred);
	struct aa_profile *profile = NULL;

	if (strcmp(name, "current") == 0)
		profile = aa_get_newest_profile(cxt->profile);
	else if (strcmp(name, "prev") == 0  && cxt->previous)
		profile = aa_get_newest_profile(cxt->previous);
	else if (strcmp(name, "exec") == 0 && cxt->onexec)
		profile = aa_get_newest_profile(cxt->onexec);
	else
		error = -EINVAL;

	if (profile)
		error = aa_getprocattr(profile, value);

	aa_put_profile(profile);
	put_cred(cred);

	return error;
}

static int apparmor_setprocattr(struct task_struct *task, char *name,
				void *value, size_t size)
{
	struct common_audit_data sa;
	struct apparmor_audit_data aad = {0,};
	char *command, *args = value;
	size_t arg_size;
	int error;

	if (size == 0)
		return -EINVAL;
	/* args points to a PAGE_SIZE buffer, AppArmor requires that
	 * the buffer must be null terminated or have size <= PAGE_SIZE -1
	 * so that AppArmor can null terminate them
	 */
	if (args[size - 1] != '\0') {
		if (size == PAGE_SIZE)
			return -EINVAL;
		args[size] = '\0';
	}

	/* task can only write its own attributes */
	if (current != task)
		return -EACCES;

	args = value;
	args = strim(args);
	command = strsep(&args, " ");
	if (!args)
		return -EINVAL;
	args = skip_spaces(args);
	if (!*args)
		return -EINVAL;

	arg_size = size - (args - (char *) value);
	if (strcmp(name, "current") == 0) {
		if (strcmp(command, "changehat") == 0) {
			error = aa_setprocattr_changehat(args, arg_size,
							 !AA_DO_TEST);
		} else if (strcmp(command, "permhat") == 0) {
			error = aa_setprocattr_changehat(args, arg_size,
							 AA_DO_TEST);
		} else if (strcmp(command, "changeprofile") == 0) {
			error = aa_setprocattr_changeprofile(args, !AA_ONEXEC,
							     !AA_DO_TEST);
		} else if (strcmp(command, "permprofile") == 0) {
			error = aa_setprocattr_changeprofile(args, !AA_ONEXEC,
							     AA_DO_TEST);
		} else
			goto fail;
	} else if (strcmp(name, "exec") == 0) {
		if (strcmp(command, "exec") == 0)
			error = aa_setprocattr_changeprofile(args, AA_ONEXEC,
							     !AA_DO_TEST);
		else
			goto fail;
	} else
		/* only support the "current" and "exec" process attributes */
		return -EINVAL;

	if (!error)
		error = size;
	return error;

fail:
	sa.type = LSM_AUDIT_DATA_NONE;
	sa.aad = &aad;
	aad.profile = aa_current_profile();
	aad.op = OP_SETPROCATTR;
	aad.info = name;
	aad.error = -EINVAL;
	aa_audit_msg(AUDIT_APPARMOR_DENIED, &sa, NULL);
	return -EINVAL;
}

static int apparmor_task_setrlimit(struct task_struct *task,
		unsigned int resource, struct rlimit *new_rlim)
{
	struct aa_profile *profile = __aa_current_profile();
	int error = 0;

	if (!unconfined(profile))
		error = aa_task_setrlimit(profile, task, resource, new_rlim);

	return error;
}

static struct security_operations apparmor_ops = {
	LSM_HOOK_INIT(name, "apparmor"),

	LSM_HOOK_INIT(ptrace_access_check, apparmor_ptrace_access_check),
	LSM_HOOK_INIT(ptrace_traceme, apparmor_ptrace_traceme),
	LSM_HOOK_INIT(capget, apparmor_capget),
	LSM_HOOK_INIT(capable, apparmor_capable),

	LSM_HOOK_INIT(path_link, apparmor_path_link),
	LSM_HOOK_INIT(path_unlink, apparmor_path_unlink),
	LSM_HOOK_INIT(path_symlink, apparmor_path_symlink),
	LSM_HOOK_INIT(path_mkdir, apparmor_path_mkdir),
	LSM_HOOK_INIT(path_rmdir, apparmor_path_rmdir),
	LSM_HOOK_INIT(path_mknod, apparmor_path_mknod),
	LSM_HOOK_INIT(path_rename, apparmor_path_rename),
	LSM_HOOK_INIT(path_chmod, apparmor_path_chmod),
	LSM_HOOK_INIT(path_chown, apparmor_path_chown),
	LSM_HOOK_INIT(path_truncate, apparmor_path_truncate),
	LSM_HOOK_INIT(inode_getattr, apparmor_inode_getattr),

	LSM_HOOK_INIT(file_open, apparmor_file_open),
	LSM_HOOK_INIT(file_permission, apparmor_file_permission),
	LSM_HOOK_INIT(file_alloc_security, apparmor_file_alloc_security),
	LSM_HOOK_INIT(file_free_security, apparmor_file_free_security),
	LSM_HOOK_INIT(mmap_file, apparmor_mmap_file),
	LSM_HOOK_INIT(mmap_addr, cap_mmap_addr),
	LSM_HOOK_INIT(file_mprotect, apparmor_file_mprotect),
	LSM_HOOK_INIT(file_lock, apparmor_file_lock),

	LSM_HOOK_INIT(getprocattr, apparmor_getprocattr),
	LSM_HOOK_INIT(setprocattr, apparmor_setprocattr),

	LSM_HOOK_INIT(cred_alloc_blank, apparmor_cred_alloc_blank),
	LSM_HOOK_INIT(cred_free, apparmor_cred_free),
	LSM_HOOK_INIT(cred_prepare, apparmor_cred_prepare),
	LSM_HOOK_INIT(cred_transfer, apparmor_cred_transfer),

	LSM_HOOK_INIT(bprm_set_creds, apparmor_bprm_set_creds),
	LSM_HOOK_INIT(bprm_committing_creds, apparmor_bprm_committing_creds),
	LSM_HOOK_INIT(bprm_committed_creds, apparmor_bprm_committed_creds),
	LSM_HOOK_INIT(bprm_secureexec, apparmor_bprm_secureexec),

	LSM_HOOK_INIT(task_setrlimit, apparmor_task_setrlimit),
};

/*
 * AppArmor sysfs module parameters
 */

static int param_set_aabool(const char *val, const struct kernel_param *kp);
static int param_get_aabool(char *buffer, const struct kernel_param *kp);
#define param_check_aabool param_check_bool
static struct kernel_param_ops param_ops_aabool = {
	.flags = KERNEL_PARAM_OPS_FL_NOARG,
	.set = param_set_aabool,
	.get = param_get_aabool
};

static int param_set_aauint(const char *val, const struct kernel_param *kp);
static int param_get_aauint(char *buffer, const struct kernel_param *kp);
#define param_check_aauint param_check_uint
static struct kernel_param_ops param_ops_aauint = {
	.set = param_set_aauint,
	.get = param_get_aauint
};

static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp);
static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp);
#define param_check_aalockpolicy param_check_bool
static struct kernel_param_ops param_ops_aalockpolicy = {
	.flags = KERNEL_PARAM_OPS_FL_NOARG,
	.set = param_set_aalockpolicy,
	.get = param_get_aalockpolicy
};

static int param_set_audit(const char *val, struct kernel_param *kp);
static int param_get_audit(char *buffer, struct kernel_param *kp);

static int param_set_mode(const char *val, struct kernel_param *kp);
static int param_get_mode(char *buffer, struct kernel_param *kp);

/* Flag values, also controllable via /sys/module/apparmor/parameters
 * We define special types as we want to do additional mediation.
 */

/* AppArmor global enforcement switch - complain, enforce, kill */
enum profile_mode aa_g_profile_mode = APPARMOR_ENFORCE;
module_param_call(mode, param_set_mode, param_get_mode,
		  &aa_g_profile_mode, S_IRUSR | S_IWUSR);

/* Debug mode */
bool aa_g_debug;
module_param_named(debug, aa_g_debug, aabool, S_IRUSR | S_IWUSR);

/* Audit mode */
enum audit_mode aa_g_audit;
module_param_call(audit, param_set_audit, param_get_audit,
		  &aa_g_audit, S_IRUSR | S_IWUSR);

/* Determines if audit header is included in audited messages.  This
 * provides more context if the audit daemon is not running
 */
bool aa_g_audit_header = 1;
module_param_named(audit_header, aa_g_audit_header, aabool,
		   S_IRUSR | S_IWUSR);

/* lock out loading/removal of policy
 * TODO: add in at boot loading of policy, which is the only way to
 *       load policy, if lock_policy is set
 */
bool aa_g_lock_policy;
module_param_named(lock_policy, aa_g_lock_policy, aalockpolicy,
		   S_IRUSR | S_IWUSR);

/* Syscall logging mode */
bool aa_g_logsyscall;
module_param_named(logsyscall, aa_g_logsyscall, aabool, S_IRUSR | S_IWUSR);

/* Maximum pathname length before accesses will start getting rejected */
unsigned int aa_g_path_max = 2 * PATH_MAX;
module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR | S_IWUSR);

/* Determines how paranoid loading of policy is and how much verification
 * on the loaded policy is done.
 */
bool aa_g_paranoid_load = 1;
module_param_named(paranoid_load, aa_g_paranoid_load, aabool,
		   S_IRUSR | S_IWUSR);

/* Boot time disable flag */
static bool apparmor_enabled = CONFIG_SECURITY_APPARMOR_BOOTPARAM_VALUE;
module_param_named(enabled, apparmor_enabled, bool, S_IRUGO);

static int __init apparmor_enabled_setup(char *str)
{
	unsigned long enabled;
	int error = kstrtoul(str, 0, &enabled);
	if (!error)
		apparmor_enabled = enabled ? 1 : 0;
	return 1;
}

__setup("apparmor=", apparmor_enabled_setup);

/* set global flag turning off the ability to load policy */
static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp)
{
	if (!capable(CAP_MAC_ADMIN))
		return -EPERM;
	if (aa_g_lock_policy)
		return -EACCES;
	return param_set_bool(val, kp);
}

static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp)
{
	if (!capable(CAP_MAC_ADMIN))
		return -EPERM;
	return param_get_bool(buffer, kp);
}

static int param_set_aabool(const char *val, const struct kernel_param *kp)
{
	if (!capable(CAP_MAC_ADMIN))
		return -EPERM;
	return param_set_bool(val, kp);
}

static int param_get_aabool(char *buffer, const struct kernel_param *kp)
{
	if (!capable(CAP_MAC_ADMIN))
		return -EPERM;
	return param_get_bool(buffer, kp);
}

static int param_set_aauint(const char *val, const struct kernel_param *kp)
{
	if (!capable(CAP_MAC_ADMIN))
		return -EPERM;
	return param_set_uint(val, kp);
}

static int param_get_aauint(char *buffer, const struct kernel_param *kp)
{
	if (!capable(CAP_MAC_ADMIN))
		return -EPERM;
	return param_get_uint(buffer, kp);
}

static int param_get_audit(char *buffer, struct kernel_param *kp)
{
	if (!capable(CAP_MAC_ADMIN))
		return -EPERM;

	if (!apparmor_enabled)
		return -EINVAL;

	return sprintf(buffer, "%s", audit_mode_names[aa_g_audit]);
}

static int param_set_audit(const char *val, struct kernel_param *kp)
{
	int i;
	if (!capable(CAP_MAC_ADMIN))
		return -EPERM;

	if (!apparmor_enabled)
		return -EINVAL;

	if (!val)
		return -EINVAL;

	for (i = 0; i < AUDIT_MAX_INDEX; i++) {
		if (strcmp(val, audit_mode_names[i]) == 0) {
			aa_g_audit = i;
			return 0;
		}
	}

	return -EINVAL;
}

static int param_get_mode(char *buffer, struct kernel_param *kp)
{
	if (!capable(CAP_MAC_ADMIN))
		return -EPERM;

	if (!apparmor_enabled)
		return -EINVAL;

	return sprintf(buffer, "%s", aa_profile_mode_names[aa_g_profile_mode]);
}

static int param_set_mode(const char *val, struct kernel_param *kp)
{
	int i;
	if (!capable(CAP_MAC_ADMIN))
		return -EPERM;

	if (!apparmor_enabled)
		return -EINVAL;

	if (!val)
		return -EINVAL;

	for (i = 0; i < APPARMOR_MODE_NAMES_MAX_INDEX; i++) {
		if (strcmp(val, aa_profile_mode_names[i]) == 0) {
			aa_g_profile_mode = i;
			return 0;
		}
	}

	return -EINVAL;
}

/*
 * AppArmor init functions
 */

/**
 * set_init_cxt - set a task context and profile on the first task.
 *
 * TODO: allow setting an alternate profile than unconfined
 */
static int __init set_init_cxt(void)
{
	struct cred *cred = (struct cred *)current->real_cred;
	struct aa_task_cxt *cxt;

	cxt = aa_alloc_task_context(GFP_KERNEL);
	if (!cxt)
		return -ENOMEM;

	cxt->profile = aa_get_profile(root_ns->unconfined);
	cred_cxt(cred) = cxt;

	return 0;
}

static int __init apparmor_init(void)
{
	int error;

	if (!apparmor_enabled || !security_module_enable(&apparmor_ops)) {
		aa_info_message("AppArmor disabled by boot time parameter");
		apparmor_enabled = 0;
		return 0;
	}

	error = aa_alloc_root_ns();
	if (error) {
		AA_ERROR("Unable to allocate default profile namespace\n");
		goto alloc_out;
	}

	error = set_init_cxt();
	if (error) {
		AA_ERROR("Failed to set context on init task\n");
		goto register_security_out;
	}

	error = register_security(&apparmor_ops);
	if (error) {
		struct cred *cred = (struct cred *)current->real_cred;
		aa_free_task_context(cred_cxt(cred));
		cred_cxt(cred) = NULL;
		AA_ERROR("Unable to register AppArmor\n");
		goto register_security_out;
	}

	/* Report that AppArmor successfully initialized */
	apparmor_initialized = 1;
	if (aa_g_profile_mode == APPARMOR_COMPLAIN)
		aa_info_message("AppArmor initialized: complain mode enabled");
	else if (aa_g_profile_mode == APPARMOR_KILL)
		aa_info_message("AppArmor initialized: kill mode enabled");
	else
		aa_info_message("AppArmor initialized");

	return error;

register_security_out:
	aa_free_root_ns();

alloc_out:
	aa_destroy_aafs();

	apparmor_enabled = 0;
	return error;
}

security_initcall(apparmor_init);