1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * AppArmor security module
4 *
5 * This file contains AppArmor LSM hooks.
6 *
7 * Copyright (C) 1998-2008 Novell/SUSE
8 * Copyright 2009-2010 Canonical Ltd.
9 */
10
11 #include <linux/lsm_hooks.h>
12 #include <linux/moduleparam.h>
13 #include <linux/mm.h>
14 #include <linux/mman.h>
15 #include <linux/mount.h>
16 #include <linux/namei.h>
17 #include <linux/ptrace.h>
18 #include <linux/ctype.h>
19 #include <linux/sysctl.h>
20 #include <linux/audit.h>
21 #include <linux/user_namespace.h>
22 #include <linux/netfilter_ipv4.h>
23 #include <linux/netfilter_ipv6.h>
24 #include <linux/zstd.h>
25 #include <net/sock.h>
26 #include <uapi/linux/mount.h>
27
28 #include "include/apparmor.h"
29 #include "include/apparmorfs.h"
30 #include "include/audit.h"
31 #include "include/capability.h"
32 #include "include/cred.h"
33 #include "include/file.h"
34 #include "include/ipc.h"
35 #include "include/net.h"
36 #include "include/path.h"
37 #include "include/label.h"
38 #include "include/policy.h"
39 #include "include/policy_ns.h"
40 #include "include/procattr.h"
41 #include "include/mount.h"
42 #include "include/secid.h"
43
44 /* Flag indicating whether initialization completed */
45 int apparmor_initialized;
46
47 union aa_buffer {
48 struct list_head list;
49 DECLARE_FLEX_ARRAY(char, buffer);
50 };
51
52 #define RESERVE_COUNT 2
53 static int reserve_count = RESERVE_COUNT;
54 static int buffer_count;
55
56 static LIST_HEAD(aa_global_buffers);
57 static DEFINE_SPINLOCK(aa_buffers_lock);
58
59 /*
60 * LSM hook functions
61 */
62
63 /*
64 * put the associated labels
65 */
apparmor_cred_free(struct cred * cred)66 static void apparmor_cred_free(struct cred *cred)
67 {
68 aa_put_label(cred_label(cred));
69 set_cred_label(cred, NULL);
70 }
71
72 /*
73 * allocate the apparmor part of blank credentials
74 */
apparmor_cred_alloc_blank(struct cred * cred,gfp_t gfp)75 static int apparmor_cred_alloc_blank(struct cred *cred, gfp_t gfp)
76 {
77 set_cred_label(cred, NULL);
78 return 0;
79 }
80
81 /*
82 * prepare new cred label for modification by prepare_cred block
83 */
apparmor_cred_prepare(struct cred * new,const struct cred * old,gfp_t gfp)84 static int apparmor_cred_prepare(struct cred *new, const struct cred *old,
85 gfp_t gfp)
86 {
87 set_cred_label(new, aa_get_newest_label(cred_label(old)));
88 return 0;
89 }
90
91 /*
92 * transfer the apparmor data to a blank set of creds
93 */
apparmor_cred_transfer(struct cred * new,const struct cred * old)94 static void apparmor_cred_transfer(struct cred *new, const struct cred *old)
95 {
96 set_cred_label(new, aa_get_newest_label(cred_label(old)));
97 }
98
apparmor_task_free(struct task_struct * task)99 static void apparmor_task_free(struct task_struct *task)
100 {
101
102 aa_free_task_ctx(task_ctx(task));
103 }
104
apparmor_task_alloc(struct task_struct * task,unsigned long clone_flags)105 static int apparmor_task_alloc(struct task_struct *task,
106 unsigned long clone_flags)
107 {
108 struct aa_task_ctx *new = task_ctx(task);
109
110 aa_dup_task_ctx(new, task_ctx(current));
111
112 return 0;
113 }
114
apparmor_ptrace_access_check(struct task_struct * child,unsigned int mode)115 static int apparmor_ptrace_access_check(struct task_struct *child,
116 unsigned int mode)
117 {
118 struct aa_label *tracer, *tracee;
119 const struct cred *cred;
120 int error;
121
122 cred = get_task_cred(child);
123 tracee = cred_label(cred); /* ref count on cred */
124 tracer = __begin_current_label_crit_section();
125 error = aa_may_ptrace(current_cred(), tracer, cred, tracee,
126 (mode & PTRACE_MODE_READ) ? AA_PTRACE_READ
127 : AA_PTRACE_TRACE);
128 __end_current_label_crit_section(tracer);
129 put_cred(cred);
130
131 return error;
132 }
133
apparmor_ptrace_traceme(struct task_struct * parent)134 static int apparmor_ptrace_traceme(struct task_struct *parent)
135 {
136 struct aa_label *tracer, *tracee;
137 const struct cred *cred;
138 int error;
139
140 tracee = __begin_current_label_crit_section();
141 cred = get_task_cred(parent);
142 tracer = cred_label(cred); /* ref count on cred */
143 error = aa_may_ptrace(cred, tracer, current_cred(), tracee,
144 AA_PTRACE_TRACE);
145 put_cred(cred);
146 __end_current_label_crit_section(tracee);
147
148 return error;
149 }
150
151 /* Derived from security/commoncap.c:cap_capget */
apparmor_capget(const struct task_struct * target,kernel_cap_t * effective,kernel_cap_t * inheritable,kernel_cap_t * permitted)152 static int apparmor_capget(const struct task_struct *target, kernel_cap_t *effective,
153 kernel_cap_t *inheritable, kernel_cap_t *permitted)
154 {
155 struct aa_label *label;
156 const struct cred *cred;
157
158 rcu_read_lock();
159 cred = __task_cred(target);
160 label = aa_get_newest_cred_label(cred);
161
162 /*
163 * cap_capget is stacked ahead of this and will
164 * initialize effective and permitted.
165 */
166 if (!unconfined(label)) {
167 struct aa_profile *profile;
168 struct label_it i;
169
170 label_for_each_confined(i, label, profile) {
171 struct aa_ruleset *rules;
172 if (COMPLAIN_MODE(profile))
173 continue;
174 rules = list_first_entry(&profile->rules,
175 typeof(*rules), list);
176 *effective = cap_intersect(*effective,
177 rules->caps.allow);
178 *permitted = cap_intersect(*permitted,
179 rules->caps.allow);
180 }
181 }
182 rcu_read_unlock();
183 aa_put_label(label);
184
185 return 0;
186 }
187
apparmor_capable(const struct cred * cred,struct user_namespace * ns,int cap,unsigned int opts)188 static int apparmor_capable(const struct cred *cred, struct user_namespace *ns,
189 int cap, unsigned int opts)
190 {
191 struct aa_label *label;
192 int error = 0;
193
194 label = aa_get_newest_cred_label(cred);
195 if (!unconfined(label))
196 error = aa_capable(cred, label, cap, opts);
197 aa_put_label(label);
198
199 return error;
200 }
201
202 /**
203 * common_perm - basic common permission check wrapper fn for paths
204 * @op: operation being checked
205 * @path: path to check permission of (NOT NULL)
206 * @mask: requested permissions mask
207 * @cond: conditional info for the permission request (NOT NULL)
208 *
209 * Returns: %0 else error code if error or permission denied
210 */
common_perm(const char * op,const struct path * path,u32 mask,struct path_cond * cond)211 static int common_perm(const char *op, const struct path *path, u32 mask,
212 struct path_cond *cond)
213 {
214 struct aa_label *label;
215 int error = 0;
216
217 label = __begin_current_label_crit_section();
218 if (!unconfined(label))
219 error = aa_path_perm(op, current_cred(), label, path, 0, mask,
220 cond);
221 __end_current_label_crit_section(label);
222
223 return error;
224 }
225
226 /**
227 * common_perm_cond - common permission wrapper around inode cond
228 * @op: operation being checked
229 * @path: location to check (NOT NULL)
230 * @mask: requested permissions mask
231 *
232 * Returns: %0 else error code if error or permission denied
233 */
common_perm_cond(const char * op,const struct path * path,u32 mask)234 static int common_perm_cond(const char *op, const struct path *path, u32 mask)
235 {
236 vfsuid_t vfsuid = i_uid_into_vfsuid(mnt_idmap(path->mnt),
237 d_backing_inode(path->dentry));
238 struct path_cond cond = {
239 vfsuid_into_kuid(vfsuid),
240 d_backing_inode(path->dentry)->i_mode
241 };
242
243 if (!path_mediated_fs(path->dentry))
244 return 0;
245
246 return common_perm(op, path, mask, &cond);
247 }
248
249 /**
250 * common_perm_dir_dentry - common permission wrapper when path is dir, dentry
251 * @op: operation being checked
252 * @dir: directory of the dentry (NOT NULL)
253 * @dentry: dentry to check (NOT NULL)
254 * @mask: requested permissions mask
255 * @cond: conditional info for the permission request (NOT NULL)
256 *
257 * Returns: %0 else error code if error or permission denied
258 */
common_perm_dir_dentry(const char * op,const struct path * dir,struct dentry * dentry,u32 mask,struct path_cond * cond)259 static int common_perm_dir_dentry(const char *op, const struct path *dir,
260 struct dentry *dentry, u32 mask,
261 struct path_cond *cond)
262 {
263 struct path path = { .mnt = dir->mnt, .dentry = dentry };
264
265 return common_perm(op, &path, mask, cond);
266 }
267
268 /**
269 * common_perm_rm - common permission wrapper for operations doing rm
270 * @op: operation being checked
271 * @dir: directory that the dentry is in (NOT NULL)
272 * @dentry: dentry being rm'd (NOT NULL)
273 * @mask: requested permission mask
274 *
275 * Returns: %0 else error code if error or permission denied
276 */
common_perm_rm(const char * op,const struct path * dir,struct dentry * dentry,u32 mask)277 static int common_perm_rm(const char *op, const struct path *dir,
278 struct dentry *dentry, u32 mask)
279 {
280 struct inode *inode = d_backing_inode(dentry);
281 struct path_cond cond = { };
282 vfsuid_t vfsuid;
283
284 if (!inode || !path_mediated_fs(dentry))
285 return 0;
286
287 vfsuid = i_uid_into_vfsuid(mnt_idmap(dir->mnt), inode);
288 cond.uid = vfsuid_into_kuid(vfsuid);
289 cond.mode = inode->i_mode;
290
291 return common_perm_dir_dentry(op, dir, dentry, mask, &cond);
292 }
293
294 /**
295 * common_perm_create - common permission wrapper for operations doing create
296 * @op: operation being checked
297 * @dir: directory that dentry will be created in (NOT NULL)
298 * @dentry: dentry to create (NOT NULL)
299 * @mask: request permission mask
300 * @mode: created file mode
301 *
302 * Returns: %0 else error code if error or permission denied
303 */
common_perm_create(const char * op,const struct path * dir,struct dentry * dentry,u32 mask,umode_t mode)304 static int common_perm_create(const char *op, const struct path *dir,
305 struct dentry *dentry, u32 mask, umode_t mode)
306 {
307 struct path_cond cond = { current_fsuid(), mode };
308
309 if (!path_mediated_fs(dir->dentry))
310 return 0;
311
312 return common_perm_dir_dentry(op, dir, dentry, mask, &cond);
313 }
314
apparmor_path_unlink(const struct path * dir,struct dentry * dentry)315 static int apparmor_path_unlink(const struct path *dir, struct dentry *dentry)
316 {
317 return common_perm_rm(OP_UNLINK, dir, dentry, AA_MAY_DELETE);
318 }
319
apparmor_path_mkdir(const struct path * dir,struct dentry * dentry,umode_t mode)320 static int apparmor_path_mkdir(const struct path *dir, struct dentry *dentry,
321 umode_t mode)
322 {
323 return common_perm_create(OP_MKDIR, dir, dentry, AA_MAY_CREATE,
324 S_IFDIR);
325 }
326
apparmor_path_rmdir(const struct path * dir,struct dentry * dentry)327 static int apparmor_path_rmdir(const struct path *dir, struct dentry *dentry)
328 {
329 return common_perm_rm(OP_RMDIR, dir, dentry, AA_MAY_DELETE);
330 }
331
apparmor_path_mknod(const struct path * dir,struct dentry * dentry,umode_t mode,unsigned int dev)332 static int apparmor_path_mknod(const struct path *dir, struct dentry *dentry,
333 umode_t mode, unsigned int dev)
334 {
335 return common_perm_create(OP_MKNOD, dir, dentry, AA_MAY_CREATE, mode);
336 }
337
apparmor_path_truncate(const struct path * path)338 static int apparmor_path_truncate(const struct path *path)
339 {
340 return common_perm_cond(OP_TRUNC, path, MAY_WRITE | AA_MAY_SETATTR);
341 }
342
apparmor_file_truncate(struct file * file)343 static int apparmor_file_truncate(struct file *file)
344 {
345 return apparmor_path_truncate(&file->f_path);
346 }
347
apparmor_path_symlink(const struct path * dir,struct dentry * dentry,const char * old_name)348 static int apparmor_path_symlink(const struct path *dir, struct dentry *dentry,
349 const char *old_name)
350 {
351 return common_perm_create(OP_SYMLINK, dir, dentry, AA_MAY_CREATE,
352 S_IFLNK);
353 }
354
apparmor_path_link(struct dentry * old_dentry,const struct path * new_dir,struct dentry * new_dentry)355 static int apparmor_path_link(struct dentry *old_dentry, const struct path *new_dir,
356 struct dentry *new_dentry)
357 {
358 struct aa_label *label;
359 int error = 0;
360
361 if (!path_mediated_fs(old_dentry))
362 return 0;
363
364 label = begin_current_label_crit_section();
365 if (!unconfined(label))
366 error = aa_path_link(current_cred(), label, old_dentry, new_dir,
367 new_dentry);
368 end_current_label_crit_section(label);
369
370 return error;
371 }
372
apparmor_path_rename(const struct path * old_dir,struct dentry * old_dentry,const struct path * new_dir,struct dentry * new_dentry,const unsigned int flags)373 static int apparmor_path_rename(const struct path *old_dir, struct dentry *old_dentry,
374 const struct path *new_dir, struct dentry *new_dentry,
375 const unsigned int flags)
376 {
377 struct aa_label *label;
378 int error = 0;
379
380 if (!path_mediated_fs(old_dentry))
381 return 0;
382 if ((flags & RENAME_EXCHANGE) && !path_mediated_fs(new_dentry))
383 return 0;
384
385 label = begin_current_label_crit_section();
386 if (!unconfined(label)) {
387 struct mnt_idmap *idmap = mnt_idmap(old_dir->mnt);
388 vfsuid_t vfsuid;
389 struct path old_path = { .mnt = old_dir->mnt,
390 .dentry = old_dentry };
391 struct path new_path = { .mnt = new_dir->mnt,
392 .dentry = new_dentry };
393 struct path_cond cond = {
394 .mode = d_backing_inode(old_dentry)->i_mode
395 };
396 vfsuid = i_uid_into_vfsuid(idmap, d_backing_inode(old_dentry));
397 cond.uid = vfsuid_into_kuid(vfsuid);
398
399 if (flags & RENAME_EXCHANGE) {
400 struct path_cond cond_exchange = {
401 .mode = d_backing_inode(new_dentry)->i_mode,
402 };
403 vfsuid = i_uid_into_vfsuid(idmap, d_backing_inode(old_dentry));
404 cond_exchange.uid = vfsuid_into_kuid(vfsuid);
405
406 error = aa_path_perm(OP_RENAME_SRC, current_cred(),
407 label, &new_path, 0,
408 MAY_READ | AA_MAY_GETATTR | MAY_WRITE |
409 AA_MAY_SETATTR | AA_MAY_DELETE,
410 &cond_exchange);
411 if (!error)
412 error = aa_path_perm(OP_RENAME_DEST, current_cred(),
413 label, &old_path,
414 0, MAY_WRITE | AA_MAY_SETATTR |
415 AA_MAY_CREATE, &cond_exchange);
416 }
417
418 if (!error)
419 error = aa_path_perm(OP_RENAME_SRC, current_cred(),
420 label, &old_path, 0,
421 MAY_READ | AA_MAY_GETATTR | MAY_WRITE |
422 AA_MAY_SETATTR | AA_MAY_DELETE,
423 &cond);
424 if (!error)
425 error = aa_path_perm(OP_RENAME_DEST, current_cred(),
426 label, &new_path,
427 0, MAY_WRITE | AA_MAY_SETATTR |
428 AA_MAY_CREATE, &cond);
429
430 }
431 end_current_label_crit_section(label);
432
433 return error;
434 }
435
apparmor_path_chmod(const struct path * path,umode_t mode)436 static int apparmor_path_chmod(const struct path *path, umode_t mode)
437 {
438 return common_perm_cond(OP_CHMOD, path, AA_MAY_CHMOD);
439 }
440
apparmor_path_chown(const struct path * path,kuid_t uid,kgid_t gid)441 static int apparmor_path_chown(const struct path *path, kuid_t uid, kgid_t gid)
442 {
443 return common_perm_cond(OP_CHOWN, path, AA_MAY_CHOWN);
444 }
445
apparmor_inode_getattr(const struct path * path)446 static int apparmor_inode_getattr(const struct path *path)
447 {
448 return common_perm_cond(OP_GETATTR, path, AA_MAY_GETATTR);
449 }
450
apparmor_file_open(struct file * file)451 static int apparmor_file_open(struct file *file)
452 {
453 struct aa_file_ctx *fctx = file_ctx(file);
454 struct aa_label *label;
455 int error = 0;
456
457 if (!path_mediated_fs(file->f_path.dentry))
458 return 0;
459
460 /* If in exec, permission is handled by bprm hooks.
461 * Cache permissions granted by the previous exec check, with
462 * implicit read and executable mmap which are required to
463 * actually execute the image.
464 */
465 if (current->in_execve) {
466 fctx->allow = MAY_EXEC | MAY_READ | AA_EXEC_MMAP;
467 return 0;
468 }
469
470 label = aa_get_newest_cred_label(file->f_cred);
471 if (!unconfined(label)) {
472 struct mnt_idmap *idmap = file_mnt_idmap(file);
473 struct inode *inode = file_inode(file);
474 vfsuid_t vfsuid;
475 struct path_cond cond = {
476 .mode = inode->i_mode,
477 };
478 vfsuid = i_uid_into_vfsuid(idmap, inode);
479 cond.uid = vfsuid_into_kuid(vfsuid);
480
481 error = aa_path_perm(OP_OPEN, file->f_cred,
482 label, &file->f_path, 0,
483 aa_map_file_to_perms(file), &cond);
484 /* todo cache full allowed permissions set and state */
485 fctx->allow = aa_map_file_to_perms(file);
486 }
487 aa_put_label(label);
488
489 return error;
490 }
491
apparmor_file_alloc_security(struct file * file)492 static int apparmor_file_alloc_security(struct file *file)
493 {
494 struct aa_file_ctx *ctx = file_ctx(file);
495 struct aa_label *label = begin_current_label_crit_section();
496
497 spin_lock_init(&ctx->lock);
498 rcu_assign_pointer(ctx->label, aa_get_label(label));
499 end_current_label_crit_section(label);
500 return 0;
501 }
502
apparmor_file_free_security(struct file * file)503 static void apparmor_file_free_security(struct file *file)
504 {
505 struct aa_file_ctx *ctx = file_ctx(file);
506
507 if (ctx)
508 aa_put_label(rcu_access_pointer(ctx->label));
509 }
510
common_file_perm(const char * op,struct file * file,u32 mask,bool in_atomic)511 static int common_file_perm(const char *op, struct file *file, u32 mask,
512 bool in_atomic)
513 {
514 struct aa_label *label;
515 int error = 0;
516
517 /* don't reaudit files closed during inheritance */
518 if (file->f_path.dentry == aa_null.dentry)
519 return -EACCES;
520
521 label = __begin_current_label_crit_section();
522 error = aa_file_perm(op, current_cred(), label, file, mask, in_atomic);
523 __end_current_label_crit_section(label);
524
525 return error;
526 }
527
apparmor_file_receive(struct file * file)528 static int apparmor_file_receive(struct file *file)
529 {
530 return common_file_perm(OP_FRECEIVE, file, aa_map_file_to_perms(file),
531 false);
532 }
533
apparmor_file_permission(struct file * file,int mask)534 static int apparmor_file_permission(struct file *file, int mask)
535 {
536 return common_file_perm(OP_FPERM, file, mask, false);
537 }
538
apparmor_file_lock(struct file * file,unsigned int cmd)539 static int apparmor_file_lock(struct file *file, unsigned int cmd)
540 {
541 u32 mask = AA_MAY_LOCK;
542
543 if (cmd == F_WRLCK)
544 mask |= MAY_WRITE;
545
546 return common_file_perm(OP_FLOCK, file, mask, false);
547 }
548
common_mmap(const char * op,struct file * file,unsigned long prot,unsigned long flags,bool in_atomic)549 static int common_mmap(const char *op, struct file *file, unsigned long prot,
550 unsigned long flags, bool in_atomic)
551 {
552 int mask = 0;
553
554 if (!file || !file_ctx(file))
555 return 0;
556
557 if (prot & PROT_READ)
558 mask |= MAY_READ;
559 /*
560 * Private mappings don't require write perms since they don't
561 * write back to the files
562 */
563 if ((prot & PROT_WRITE) && !(flags & MAP_PRIVATE))
564 mask |= MAY_WRITE;
565 if (prot & PROT_EXEC)
566 mask |= AA_EXEC_MMAP;
567
568 return common_file_perm(op, file, mask, in_atomic);
569 }
570
apparmor_mmap_file(struct file * file,unsigned long reqprot,unsigned long prot,unsigned long flags)571 static int apparmor_mmap_file(struct file *file, unsigned long reqprot,
572 unsigned long prot, unsigned long flags)
573 {
574 return common_mmap(OP_FMMAP, file, prot, flags, GFP_ATOMIC);
575 }
576
apparmor_file_mprotect(struct vm_area_struct * vma,unsigned long reqprot,unsigned long prot)577 static int apparmor_file_mprotect(struct vm_area_struct *vma,
578 unsigned long reqprot, unsigned long prot)
579 {
580 return common_mmap(OP_FMPROT, vma->vm_file, prot,
581 !(vma->vm_flags & VM_SHARED) ? MAP_PRIVATE : 0,
582 false);
583 }
584
apparmor_sb_mount(const char * dev_name,const struct path * path,const char * type,unsigned long flags,void * data)585 static int apparmor_sb_mount(const char *dev_name, const struct path *path,
586 const char *type, unsigned long flags, void *data)
587 {
588 struct aa_label *label;
589 int error = 0;
590
591 /* Discard magic */
592 if ((flags & MS_MGC_MSK) == MS_MGC_VAL)
593 flags &= ~MS_MGC_MSK;
594
595 flags &= ~AA_MS_IGNORE_MASK;
596
597 label = __begin_current_label_crit_section();
598 if (!unconfined(label)) {
599 if (flags & MS_REMOUNT)
600 error = aa_remount(current_cred(), label, path, flags,
601 data);
602 else if (flags & MS_BIND)
603 error = aa_bind_mount(current_cred(), label, path,
604 dev_name, flags);
605 else if (flags & (MS_SHARED | MS_PRIVATE | MS_SLAVE |
606 MS_UNBINDABLE))
607 error = aa_mount_change_type(current_cred(), label,
608 path, flags);
609 else if (flags & MS_MOVE)
610 error = aa_move_mount_old(current_cred(), label, path,
611 dev_name);
612 else
613 error = aa_new_mount(current_cred(), label, dev_name,
614 path, type, flags, data);
615 }
616 __end_current_label_crit_section(label);
617
618 return error;
619 }
620
apparmor_move_mount(const struct path * from_path,const struct path * to_path)621 static int apparmor_move_mount(const struct path *from_path,
622 const struct path *to_path)
623 {
624 struct aa_label *label;
625 int error = 0;
626
627 label = __begin_current_label_crit_section();
628 if (!unconfined(label))
629 error = aa_move_mount(current_cred(), label, from_path,
630 to_path);
631 __end_current_label_crit_section(label);
632
633 return error;
634 }
635
apparmor_sb_umount(struct vfsmount * mnt,int flags)636 static int apparmor_sb_umount(struct vfsmount *mnt, int flags)
637 {
638 struct aa_label *label;
639 int error = 0;
640
641 label = __begin_current_label_crit_section();
642 if (!unconfined(label))
643 error = aa_umount(current_cred(), label, mnt, flags);
644 __end_current_label_crit_section(label);
645
646 return error;
647 }
648
apparmor_sb_pivotroot(const struct path * old_path,const struct path * new_path)649 static int apparmor_sb_pivotroot(const struct path *old_path,
650 const struct path *new_path)
651 {
652 struct aa_label *label;
653 int error = 0;
654
655 label = aa_get_current_label();
656 if (!unconfined(label))
657 error = aa_pivotroot(current_cred(), label, old_path, new_path);
658 aa_put_label(label);
659
660 return error;
661 }
662
apparmor_getprocattr(struct task_struct * task,const char * name,char ** value)663 static int apparmor_getprocattr(struct task_struct *task, const char *name,
664 char **value)
665 {
666 int error = -ENOENT;
667 /* released below */
668 const struct cred *cred = get_task_cred(task);
669 struct aa_task_ctx *ctx = task_ctx(current);
670 struct aa_label *label = NULL;
671
672 if (strcmp(name, "current") == 0)
673 label = aa_get_newest_label(cred_label(cred));
674 else if (strcmp(name, "prev") == 0 && ctx->previous)
675 label = aa_get_newest_label(ctx->previous);
676 else if (strcmp(name, "exec") == 0 && ctx->onexec)
677 label = aa_get_newest_label(ctx->onexec);
678 else
679 error = -EINVAL;
680
681 if (label)
682 error = aa_getprocattr(label, value);
683
684 aa_put_label(label);
685 put_cred(cred);
686
687 return error;
688 }
689
apparmor_setprocattr(const char * name,void * value,size_t size)690 static int apparmor_setprocattr(const char *name, void *value,
691 size_t size)
692 {
693 char *command, *largs = NULL, *args = value;
694 size_t arg_size;
695 int error;
696 DEFINE_AUDIT_DATA(ad, LSM_AUDIT_DATA_NONE, AA_CLASS_NONE,
697 OP_SETPROCATTR);
698
699 if (size == 0)
700 return -EINVAL;
701
702 /* AppArmor requires that the buffer must be null terminated atm */
703 if (args[size - 1] != '\0') {
704 /* null terminate */
705 largs = args = kmalloc(size + 1, GFP_KERNEL);
706 if (!args)
707 return -ENOMEM;
708 memcpy(args, value, size);
709 args[size] = '\0';
710 }
711
712 error = -EINVAL;
713 args = strim(args);
714 command = strsep(&args, " ");
715 if (!args)
716 goto out;
717 args = skip_spaces(args);
718 if (!*args)
719 goto out;
720
721 arg_size = size - (args - (largs ? largs : (char *) value));
722 if (strcmp(name, "current") == 0) {
723 if (strcmp(command, "changehat") == 0) {
724 error = aa_setprocattr_changehat(args, arg_size,
725 AA_CHANGE_NOFLAGS);
726 } else if (strcmp(command, "permhat") == 0) {
727 error = aa_setprocattr_changehat(args, arg_size,
728 AA_CHANGE_TEST);
729 } else if (strcmp(command, "changeprofile") == 0) {
730 error = aa_change_profile(args, AA_CHANGE_NOFLAGS);
731 } else if (strcmp(command, "permprofile") == 0) {
732 error = aa_change_profile(args, AA_CHANGE_TEST);
733 } else if (strcmp(command, "stack") == 0) {
734 error = aa_change_profile(args, AA_CHANGE_STACK);
735 } else
736 goto fail;
737 } else if (strcmp(name, "exec") == 0) {
738 if (strcmp(command, "exec") == 0)
739 error = aa_change_profile(args, AA_CHANGE_ONEXEC);
740 else if (strcmp(command, "stack") == 0)
741 error = aa_change_profile(args, (AA_CHANGE_ONEXEC |
742 AA_CHANGE_STACK));
743 else
744 goto fail;
745 } else
746 /* only support the "current" and "exec" process attributes */
747 goto fail;
748
749 if (!error)
750 error = size;
751 out:
752 kfree(largs);
753 return error;
754
755 fail:
756 ad.subj_label = begin_current_label_crit_section();
757 ad.info = name;
758 ad.error = error = -EINVAL;
759 aa_audit_msg(AUDIT_APPARMOR_DENIED, &ad, NULL);
760 end_current_label_crit_section(ad.subj_label);
761 goto out;
762 }
763
764 /**
765 * apparmor_bprm_committing_creds - do task cleanup on committing new creds
766 * @bprm: binprm for the exec (NOT NULL)
767 */
apparmor_bprm_committing_creds(struct linux_binprm * bprm)768 static void apparmor_bprm_committing_creds(struct linux_binprm *bprm)
769 {
770 struct aa_label *label = aa_current_raw_label();
771 struct aa_label *new_label = cred_label(bprm->cred);
772
773 /* bail out if unconfined or not changing profile */
774 if ((new_label->proxy == label->proxy) ||
775 (unconfined(new_label)))
776 return;
777
778 aa_inherit_files(bprm->cred, current->files);
779
780 current->pdeath_signal = 0;
781
782 /* reset soft limits and set hard limits for the new label */
783 __aa_transition_rlimits(label, new_label);
784 }
785
786 /**
787 * apparmor_bprm_committed_creds() - do cleanup after new creds committed
788 * @bprm: binprm for the exec (NOT NULL)
789 */
apparmor_bprm_committed_creds(struct linux_binprm * bprm)790 static void apparmor_bprm_committed_creds(struct linux_binprm *bprm)
791 {
792 /* clear out temporary/transitional state from the context */
793 aa_clear_task_ctx_trans(task_ctx(current));
794
795 return;
796 }
797
apparmor_current_getsecid_subj(u32 * secid)798 static void apparmor_current_getsecid_subj(u32 *secid)
799 {
800 struct aa_label *label = aa_get_current_label();
801 *secid = label->secid;
802 aa_put_label(label);
803 }
804
apparmor_task_getsecid_obj(struct task_struct * p,u32 * secid)805 static void apparmor_task_getsecid_obj(struct task_struct *p, u32 *secid)
806 {
807 struct aa_label *label = aa_get_task_label(p);
808 *secid = label->secid;
809 aa_put_label(label);
810 }
811
apparmor_task_setrlimit(struct task_struct * task,unsigned int resource,struct rlimit * new_rlim)812 static int apparmor_task_setrlimit(struct task_struct *task,
813 unsigned int resource, struct rlimit *new_rlim)
814 {
815 struct aa_label *label = __begin_current_label_crit_section();
816 int error = 0;
817
818 if (!unconfined(label))
819 error = aa_task_setrlimit(current_cred(), label, task,
820 resource, new_rlim);
821 __end_current_label_crit_section(label);
822
823 return error;
824 }
825
apparmor_task_kill(struct task_struct * target,struct kernel_siginfo * info,int sig,const struct cred * cred)826 static int apparmor_task_kill(struct task_struct *target, struct kernel_siginfo *info,
827 int sig, const struct cred *cred)
828 {
829 const struct cred *tc;
830 struct aa_label *cl, *tl;
831 int error;
832
833 tc = get_task_cred(target);
834 tl = aa_get_newest_cred_label(tc);
835 if (cred) {
836 /*
837 * Dealing with USB IO specific behavior
838 */
839 cl = aa_get_newest_cred_label(cred);
840 error = aa_may_signal(cred, cl, tc, tl, sig);
841 aa_put_label(cl);
842 } else {
843 cl = __begin_current_label_crit_section();
844 error = aa_may_signal(current_cred(), cl, tc, tl, sig);
845 __end_current_label_crit_section(cl);
846 }
847 aa_put_label(tl);
848 put_cred(tc);
849
850 return error;
851 }
852
853 /**
854 * apparmor_sk_alloc_security - allocate and attach the sk_security field
855 */
apparmor_sk_alloc_security(struct sock * sk,int family,gfp_t flags)856 static int apparmor_sk_alloc_security(struct sock *sk, int family, gfp_t flags)
857 {
858 struct aa_sk_ctx *ctx;
859
860 ctx = kzalloc(sizeof(*ctx), flags);
861 if (!ctx)
862 return -ENOMEM;
863
864 SK_CTX(sk) = ctx;
865
866 return 0;
867 }
868
869 /**
870 * apparmor_sk_free_security - free the sk_security field
871 */
apparmor_sk_free_security(struct sock * sk)872 static void apparmor_sk_free_security(struct sock *sk)
873 {
874 struct aa_sk_ctx *ctx = SK_CTX(sk);
875
876 SK_CTX(sk) = NULL;
877 aa_put_label(ctx->label);
878 aa_put_label(ctx->peer);
879 kfree(ctx);
880 }
881
882 /**
883 * apparmor_sk_clone_security - clone the sk_security field
884 */
apparmor_sk_clone_security(const struct sock * sk,struct sock * newsk)885 static void apparmor_sk_clone_security(const struct sock *sk,
886 struct sock *newsk)
887 {
888 struct aa_sk_ctx *ctx = SK_CTX(sk);
889 struct aa_sk_ctx *new = SK_CTX(newsk);
890
891 if (new->label)
892 aa_put_label(new->label);
893 new->label = aa_get_label(ctx->label);
894
895 if (new->peer)
896 aa_put_label(new->peer);
897 new->peer = aa_get_label(ctx->peer);
898 }
899
900 /**
901 * apparmor_socket_create - check perms before creating a new socket
902 */
apparmor_socket_create(int family,int type,int protocol,int kern)903 static int apparmor_socket_create(int family, int type, int protocol, int kern)
904 {
905 struct aa_label *label;
906 int error = 0;
907
908 AA_BUG(in_interrupt());
909
910 label = begin_current_label_crit_section();
911 if (!(kern || unconfined(label)))
912 error = af_select(family,
913 create_perm(label, family, type, protocol),
914 aa_af_perm(current_cred(), label,
915 OP_CREATE, AA_MAY_CREATE,
916 family, type, protocol));
917 end_current_label_crit_section(label);
918
919 return error;
920 }
921
922 /**
923 * apparmor_socket_post_create - setup the per-socket security struct
924 *
925 * Note:
926 * - kernel sockets currently labeled unconfined but we may want to
927 * move to a special kernel label
928 * - socket may not have sk here if created with sock_create_lite or
929 * sock_alloc. These should be accept cases which will be handled in
930 * sock_graft.
931 */
apparmor_socket_post_create(struct socket * sock,int family,int type,int protocol,int kern)932 static int apparmor_socket_post_create(struct socket *sock, int family,
933 int type, int protocol, int kern)
934 {
935 struct aa_label *label;
936
937 if (kern) {
938 label = aa_get_label(kernel_t);
939 } else
940 label = aa_get_current_label();
941
942 if (sock->sk) {
943 struct aa_sk_ctx *ctx = SK_CTX(sock->sk);
944
945 aa_put_label(ctx->label);
946 ctx->label = aa_get_label(label);
947 }
948 aa_put_label(label);
949
950 return 0;
951 }
952
953 /**
954 * apparmor_socket_bind - check perms before bind addr to socket
955 */
apparmor_socket_bind(struct socket * sock,struct sockaddr * address,int addrlen)956 static int apparmor_socket_bind(struct socket *sock,
957 struct sockaddr *address, int addrlen)
958 {
959 AA_BUG(!sock);
960 AA_BUG(!sock->sk);
961 AA_BUG(!address);
962 AA_BUG(in_interrupt());
963
964 return af_select(sock->sk->sk_family,
965 bind_perm(sock, address, addrlen),
966 aa_sk_perm(OP_BIND, AA_MAY_BIND, sock->sk));
967 }
968
969 /**
970 * apparmor_socket_connect - check perms before connecting @sock to @address
971 */
apparmor_socket_connect(struct socket * sock,struct sockaddr * address,int addrlen)972 static int apparmor_socket_connect(struct socket *sock,
973 struct sockaddr *address, int addrlen)
974 {
975 AA_BUG(!sock);
976 AA_BUG(!sock->sk);
977 AA_BUG(!address);
978 AA_BUG(in_interrupt());
979
980 return af_select(sock->sk->sk_family,
981 connect_perm(sock, address, addrlen),
982 aa_sk_perm(OP_CONNECT, AA_MAY_CONNECT, sock->sk));
983 }
984
985 /**
986 * apparmor_socket_listen - check perms before allowing listen
987 */
apparmor_socket_listen(struct socket * sock,int backlog)988 static int apparmor_socket_listen(struct socket *sock, int backlog)
989 {
990 AA_BUG(!sock);
991 AA_BUG(!sock->sk);
992 AA_BUG(in_interrupt());
993
994 return af_select(sock->sk->sk_family,
995 listen_perm(sock, backlog),
996 aa_sk_perm(OP_LISTEN, AA_MAY_LISTEN, sock->sk));
997 }
998
999 /**
1000 * apparmor_socket_accept - check perms before accepting a new connection.
1001 *
1002 * Note: while @newsock is created and has some information, the accept
1003 * has not been done.
1004 */
apparmor_socket_accept(struct socket * sock,struct socket * newsock)1005 static int apparmor_socket_accept(struct socket *sock, struct socket *newsock)
1006 {
1007 AA_BUG(!sock);
1008 AA_BUG(!sock->sk);
1009 AA_BUG(!newsock);
1010 AA_BUG(in_interrupt());
1011
1012 return af_select(sock->sk->sk_family,
1013 accept_perm(sock, newsock),
1014 aa_sk_perm(OP_ACCEPT, AA_MAY_ACCEPT, sock->sk));
1015 }
1016
aa_sock_msg_perm(const char * op,u32 request,struct socket * sock,struct msghdr * msg,int size)1017 static int aa_sock_msg_perm(const char *op, u32 request, struct socket *sock,
1018 struct msghdr *msg, int size)
1019 {
1020 AA_BUG(!sock);
1021 AA_BUG(!sock->sk);
1022 AA_BUG(!msg);
1023 AA_BUG(in_interrupt());
1024
1025 return af_select(sock->sk->sk_family,
1026 msg_perm(op, request, sock, msg, size),
1027 aa_sk_perm(op, request, sock->sk));
1028 }
1029
1030 /**
1031 * apparmor_socket_sendmsg - check perms before sending msg to another socket
1032 */
apparmor_socket_sendmsg(struct socket * sock,struct msghdr * msg,int size)1033 static int apparmor_socket_sendmsg(struct socket *sock,
1034 struct msghdr *msg, int size)
1035 {
1036 return aa_sock_msg_perm(OP_SENDMSG, AA_MAY_SEND, sock, msg, size);
1037 }
1038
1039 /**
1040 * apparmor_socket_recvmsg - check perms before receiving a message
1041 */
apparmor_socket_recvmsg(struct socket * sock,struct msghdr * msg,int size,int flags)1042 static int apparmor_socket_recvmsg(struct socket *sock,
1043 struct msghdr *msg, int size, int flags)
1044 {
1045 return aa_sock_msg_perm(OP_RECVMSG, AA_MAY_RECEIVE, sock, msg, size);
1046 }
1047
1048 /* revaliation, get/set attr, shutdown */
aa_sock_perm(const char * op,u32 request,struct socket * sock)1049 static int aa_sock_perm(const char *op, u32 request, struct socket *sock)
1050 {
1051 AA_BUG(!sock);
1052 AA_BUG(!sock->sk);
1053 AA_BUG(in_interrupt());
1054
1055 return af_select(sock->sk->sk_family,
1056 sock_perm(op, request, sock),
1057 aa_sk_perm(op, request, sock->sk));
1058 }
1059
1060 /**
1061 * apparmor_socket_getsockname - check perms before getting the local address
1062 */
apparmor_socket_getsockname(struct socket * sock)1063 static int apparmor_socket_getsockname(struct socket *sock)
1064 {
1065 return aa_sock_perm(OP_GETSOCKNAME, AA_MAY_GETATTR, sock);
1066 }
1067
1068 /**
1069 * apparmor_socket_getpeername - check perms before getting remote address
1070 */
apparmor_socket_getpeername(struct socket * sock)1071 static int apparmor_socket_getpeername(struct socket *sock)
1072 {
1073 return aa_sock_perm(OP_GETPEERNAME, AA_MAY_GETATTR, sock);
1074 }
1075
1076 /* revaliation, get/set attr, opt */
aa_sock_opt_perm(const char * op,u32 request,struct socket * sock,int level,int optname)1077 static int aa_sock_opt_perm(const char *op, u32 request, struct socket *sock,
1078 int level, int optname)
1079 {
1080 AA_BUG(!sock);
1081 AA_BUG(!sock->sk);
1082 AA_BUG(in_interrupt());
1083
1084 return af_select(sock->sk->sk_family,
1085 opt_perm(op, request, sock, level, optname),
1086 aa_sk_perm(op, request, sock->sk));
1087 }
1088
1089 /**
1090 * apparmor_socket_getsockopt - check perms before getting socket options
1091 */
apparmor_socket_getsockopt(struct socket * sock,int level,int optname)1092 static int apparmor_socket_getsockopt(struct socket *sock, int level,
1093 int optname)
1094 {
1095 return aa_sock_opt_perm(OP_GETSOCKOPT, AA_MAY_GETOPT, sock,
1096 level, optname);
1097 }
1098
1099 /**
1100 * apparmor_socket_setsockopt - check perms before setting socket options
1101 */
apparmor_socket_setsockopt(struct socket * sock,int level,int optname)1102 static int apparmor_socket_setsockopt(struct socket *sock, int level,
1103 int optname)
1104 {
1105 return aa_sock_opt_perm(OP_SETSOCKOPT, AA_MAY_SETOPT, sock,
1106 level, optname);
1107 }
1108
1109 /**
1110 * apparmor_socket_shutdown - check perms before shutting down @sock conn
1111 */
apparmor_socket_shutdown(struct socket * sock,int how)1112 static int apparmor_socket_shutdown(struct socket *sock, int how)
1113 {
1114 return aa_sock_perm(OP_SHUTDOWN, AA_MAY_SHUTDOWN, sock);
1115 }
1116
1117 #ifdef CONFIG_NETWORK_SECMARK
1118 /**
1119 * apparmor_socket_sock_rcv_skb - check perms before associating skb to sk
1120 *
1121 * Note: can not sleep may be called with locks held
1122 *
1123 * dont want protocol specific in __skb_recv_datagram()
1124 * to deny an incoming connection socket_sock_rcv_skb()
1125 */
apparmor_socket_sock_rcv_skb(struct sock * sk,struct sk_buff * skb)1126 static int apparmor_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
1127 {
1128 struct aa_sk_ctx *ctx = SK_CTX(sk);
1129
1130 if (!skb->secmark)
1131 return 0;
1132
1133 return apparmor_secmark_check(ctx->label, OP_RECVMSG, AA_MAY_RECEIVE,
1134 skb->secmark, sk);
1135 }
1136 #endif
1137
1138
sk_peer_label(struct sock * sk)1139 static struct aa_label *sk_peer_label(struct sock *sk)
1140 {
1141 struct aa_sk_ctx *ctx = SK_CTX(sk);
1142
1143 if (ctx->peer)
1144 return ctx->peer;
1145
1146 return ERR_PTR(-ENOPROTOOPT);
1147 }
1148
1149 /**
1150 * apparmor_socket_getpeersec_stream - get security context of peer
1151 *
1152 * Note: for tcp only valid if using ipsec or cipso on lan
1153 */
apparmor_socket_getpeersec_stream(struct socket * sock,sockptr_t optval,sockptr_t optlen,unsigned int len)1154 static int apparmor_socket_getpeersec_stream(struct socket *sock,
1155 sockptr_t optval, sockptr_t optlen,
1156 unsigned int len)
1157 {
1158 char *name = NULL;
1159 int slen, error = 0;
1160 struct aa_label *label;
1161 struct aa_label *peer;
1162
1163 label = begin_current_label_crit_section();
1164 peer = sk_peer_label(sock->sk);
1165 if (IS_ERR(peer)) {
1166 error = PTR_ERR(peer);
1167 goto done;
1168 }
1169 slen = aa_label_asxprint(&name, labels_ns(label), peer,
1170 FLAG_SHOW_MODE | FLAG_VIEW_SUBNS |
1171 FLAG_HIDDEN_UNCONFINED, GFP_KERNEL);
1172 /* don't include terminating \0 in slen, it breaks some apps */
1173 if (slen < 0) {
1174 error = -ENOMEM;
1175 goto done;
1176 }
1177 if (slen > len) {
1178 error = -ERANGE;
1179 goto done_len;
1180 }
1181
1182 if (copy_to_sockptr(optval, name, slen))
1183 error = -EFAULT;
1184 done_len:
1185 if (copy_to_sockptr(optlen, &slen, sizeof(slen)))
1186 error = -EFAULT;
1187 done:
1188 end_current_label_crit_section(label);
1189 kfree(name);
1190 return error;
1191 }
1192
1193 /**
1194 * apparmor_socket_getpeersec_dgram - get security label of packet
1195 * @sock: the peer socket
1196 * @skb: packet data
1197 * @secid: pointer to where to put the secid of the packet
1198 *
1199 * Sets the netlabel socket state on sk from parent
1200 */
apparmor_socket_getpeersec_dgram(struct socket * sock,struct sk_buff * skb,u32 * secid)1201 static int apparmor_socket_getpeersec_dgram(struct socket *sock,
1202 struct sk_buff *skb, u32 *secid)
1203
1204 {
1205 /* TODO: requires secid support */
1206 return -ENOPROTOOPT;
1207 }
1208
1209 /**
1210 * apparmor_sock_graft - Initialize newly created socket
1211 * @sk: child sock
1212 * @parent: parent socket
1213 *
1214 * Note: could set off of SOCK_CTX(parent) but need to track inode and we can
1215 * just set sk security information off of current creating process label
1216 * Labeling of sk for accept case - probably should be sock based
1217 * instead of task, because of the case where an implicitly labeled
1218 * socket is shared by different tasks.
1219 */
apparmor_sock_graft(struct sock * sk,struct socket * parent)1220 static void apparmor_sock_graft(struct sock *sk, struct socket *parent)
1221 {
1222 struct aa_sk_ctx *ctx = SK_CTX(sk);
1223
1224 if (!ctx->label)
1225 ctx->label = aa_get_current_label();
1226 }
1227
1228 #ifdef CONFIG_NETWORK_SECMARK
apparmor_inet_conn_request(const struct sock * sk,struct sk_buff * skb,struct request_sock * req)1229 static int apparmor_inet_conn_request(const struct sock *sk, struct sk_buff *skb,
1230 struct request_sock *req)
1231 {
1232 struct aa_sk_ctx *ctx = SK_CTX(sk);
1233
1234 if (!skb->secmark)
1235 return 0;
1236
1237 return apparmor_secmark_check(ctx->label, OP_CONNECT, AA_MAY_CONNECT,
1238 skb->secmark, sk);
1239 }
1240 #endif
1241
1242 /*
1243 * The cred blob is a pointer to, not an instance of, an aa_label.
1244 */
1245 struct lsm_blob_sizes apparmor_blob_sizes __ro_after_init = {
1246 .lbs_cred = sizeof(struct aa_label *),
1247 .lbs_file = sizeof(struct aa_file_ctx),
1248 .lbs_task = sizeof(struct aa_task_ctx),
1249 };
1250
1251 static struct security_hook_list apparmor_hooks[] __ro_after_init = {
1252 LSM_HOOK_INIT(ptrace_access_check, apparmor_ptrace_access_check),
1253 LSM_HOOK_INIT(ptrace_traceme, apparmor_ptrace_traceme),
1254 LSM_HOOK_INIT(capget, apparmor_capget),
1255 LSM_HOOK_INIT(capable, apparmor_capable),
1256
1257 LSM_HOOK_INIT(move_mount, apparmor_move_mount),
1258 LSM_HOOK_INIT(sb_mount, apparmor_sb_mount),
1259 LSM_HOOK_INIT(sb_umount, apparmor_sb_umount),
1260 LSM_HOOK_INIT(sb_pivotroot, apparmor_sb_pivotroot),
1261
1262 LSM_HOOK_INIT(path_link, apparmor_path_link),
1263 LSM_HOOK_INIT(path_unlink, apparmor_path_unlink),
1264 LSM_HOOK_INIT(path_symlink, apparmor_path_symlink),
1265 LSM_HOOK_INIT(path_mkdir, apparmor_path_mkdir),
1266 LSM_HOOK_INIT(path_rmdir, apparmor_path_rmdir),
1267 LSM_HOOK_INIT(path_mknod, apparmor_path_mknod),
1268 LSM_HOOK_INIT(path_rename, apparmor_path_rename),
1269 LSM_HOOK_INIT(path_chmod, apparmor_path_chmod),
1270 LSM_HOOK_INIT(path_chown, apparmor_path_chown),
1271 LSM_HOOK_INIT(path_truncate, apparmor_path_truncate),
1272 LSM_HOOK_INIT(inode_getattr, apparmor_inode_getattr),
1273
1274 LSM_HOOK_INIT(file_open, apparmor_file_open),
1275 LSM_HOOK_INIT(file_receive, apparmor_file_receive),
1276 LSM_HOOK_INIT(file_permission, apparmor_file_permission),
1277 LSM_HOOK_INIT(file_alloc_security, apparmor_file_alloc_security),
1278 LSM_HOOK_INIT(file_free_security, apparmor_file_free_security),
1279 LSM_HOOK_INIT(mmap_file, apparmor_mmap_file),
1280 LSM_HOOK_INIT(file_mprotect, apparmor_file_mprotect),
1281 LSM_HOOK_INIT(file_lock, apparmor_file_lock),
1282 LSM_HOOK_INIT(file_truncate, apparmor_file_truncate),
1283
1284 LSM_HOOK_INIT(getprocattr, apparmor_getprocattr),
1285 LSM_HOOK_INIT(setprocattr, apparmor_setprocattr),
1286
1287 LSM_HOOK_INIT(sk_alloc_security, apparmor_sk_alloc_security),
1288 LSM_HOOK_INIT(sk_free_security, apparmor_sk_free_security),
1289 LSM_HOOK_INIT(sk_clone_security, apparmor_sk_clone_security),
1290
1291 LSM_HOOK_INIT(socket_create, apparmor_socket_create),
1292 LSM_HOOK_INIT(socket_post_create, apparmor_socket_post_create),
1293 LSM_HOOK_INIT(socket_bind, apparmor_socket_bind),
1294 LSM_HOOK_INIT(socket_connect, apparmor_socket_connect),
1295 LSM_HOOK_INIT(socket_listen, apparmor_socket_listen),
1296 LSM_HOOK_INIT(socket_accept, apparmor_socket_accept),
1297 LSM_HOOK_INIT(socket_sendmsg, apparmor_socket_sendmsg),
1298 LSM_HOOK_INIT(socket_recvmsg, apparmor_socket_recvmsg),
1299 LSM_HOOK_INIT(socket_getsockname, apparmor_socket_getsockname),
1300 LSM_HOOK_INIT(socket_getpeername, apparmor_socket_getpeername),
1301 LSM_HOOK_INIT(socket_getsockopt, apparmor_socket_getsockopt),
1302 LSM_HOOK_INIT(socket_setsockopt, apparmor_socket_setsockopt),
1303 LSM_HOOK_INIT(socket_shutdown, apparmor_socket_shutdown),
1304 #ifdef CONFIG_NETWORK_SECMARK
1305 LSM_HOOK_INIT(socket_sock_rcv_skb, apparmor_socket_sock_rcv_skb),
1306 #endif
1307 LSM_HOOK_INIT(socket_getpeersec_stream,
1308 apparmor_socket_getpeersec_stream),
1309 LSM_HOOK_INIT(socket_getpeersec_dgram,
1310 apparmor_socket_getpeersec_dgram),
1311 LSM_HOOK_INIT(sock_graft, apparmor_sock_graft),
1312 #ifdef CONFIG_NETWORK_SECMARK
1313 LSM_HOOK_INIT(inet_conn_request, apparmor_inet_conn_request),
1314 #endif
1315
1316 LSM_HOOK_INIT(cred_alloc_blank, apparmor_cred_alloc_blank),
1317 LSM_HOOK_INIT(cred_free, apparmor_cred_free),
1318 LSM_HOOK_INIT(cred_prepare, apparmor_cred_prepare),
1319 LSM_HOOK_INIT(cred_transfer, apparmor_cred_transfer),
1320
1321 LSM_HOOK_INIT(bprm_creds_for_exec, apparmor_bprm_creds_for_exec),
1322 LSM_HOOK_INIT(bprm_committing_creds, apparmor_bprm_committing_creds),
1323 LSM_HOOK_INIT(bprm_committed_creds, apparmor_bprm_committed_creds),
1324
1325 LSM_HOOK_INIT(task_free, apparmor_task_free),
1326 LSM_HOOK_INIT(task_alloc, apparmor_task_alloc),
1327 LSM_HOOK_INIT(current_getsecid_subj, apparmor_current_getsecid_subj),
1328 LSM_HOOK_INIT(task_getsecid_obj, apparmor_task_getsecid_obj),
1329 LSM_HOOK_INIT(task_setrlimit, apparmor_task_setrlimit),
1330 LSM_HOOK_INIT(task_kill, apparmor_task_kill),
1331
1332 #ifdef CONFIG_AUDIT
1333 LSM_HOOK_INIT(audit_rule_init, aa_audit_rule_init),
1334 LSM_HOOK_INIT(audit_rule_known, aa_audit_rule_known),
1335 LSM_HOOK_INIT(audit_rule_match, aa_audit_rule_match),
1336 LSM_HOOK_INIT(audit_rule_free, aa_audit_rule_free),
1337 #endif
1338
1339 LSM_HOOK_INIT(secid_to_secctx, apparmor_secid_to_secctx),
1340 LSM_HOOK_INIT(secctx_to_secid, apparmor_secctx_to_secid),
1341 LSM_HOOK_INIT(release_secctx, apparmor_release_secctx),
1342 };
1343
1344 /*
1345 * AppArmor sysfs module parameters
1346 */
1347
1348 static int param_set_aabool(const char *val, const struct kernel_param *kp);
1349 static int param_get_aabool(char *buffer, const struct kernel_param *kp);
1350 #define param_check_aabool param_check_bool
1351 static const struct kernel_param_ops param_ops_aabool = {
1352 .flags = KERNEL_PARAM_OPS_FL_NOARG,
1353 .set = param_set_aabool,
1354 .get = param_get_aabool
1355 };
1356
1357 static int param_set_aauint(const char *val, const struct kernel_param *kp);
1358 static int param_get_aauint(char *buffer, const struct kernel_param *kp);
1359 #define param_check_aauint param_check_uint
1360 static const struct kernel_param_ops param_ops_aauint = {
1361 .set = param_set_aauint,
1362 .get = param_get_aauint
1363 };
1364
1365 static int param_set_aacompressionlevel(const char *val,
1366 const struct kernel_param *kp);
1367 static int param_get_aacompressionlevel(char *buffer,
1368 const struct kernel_param *kp);
1369 #define param_check_aacompressionlevel param_check_int
1370 static const struct kernel_param_ops param_ops_aacompressionlevel = {
1371 .set = param_set_aacompressionlevel,
1372 .get = param_get_aacompressionlevel
1373 };
1374
1375 static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp);
1376 static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp);
1377 #define param_check_aalockpolicy param_check_bool
1378 static const struct kernel_param_ops param_ops_aalockpolicy = {
1379 .flags = KERNEL_PARAM_OPS_FL_NOARG,
1380 .set = param_set_aalockpolicy,
1381 .get = param_get_aalockpolicy
1382 };
1383
1384 static int param_set_audit(const char *val, const struct kernel_param *kp);
1385 static int param_get_audit(char *buffer, const struct kernel_param *kp);
1386
1387 static int param_set_mode(const char *val, const struct kernel_param *kp);
1388 static int param_get_mode(char *buffer, const struct kernel_param *kp);
1389
1390 /* Flag values, also controllable via /sys/module/apparmor/parameters
1391 * We define special types as we want to do additional mediation.
1392 */
1393
1394 /* AppArmor global enforcement switch - complain, enforce, kill */
1395 enum profile_mode aa_g_profile_mode = APPARMOR_ENFORCE;
1396 module_param_call(mode, param_set_mode, param_get_mode,
1397 &aa_g_profile_mode, S_IRUSR | S_IWUSR);
1398
1399 /* whether policy verification hashing is enabled */
1400 bool aa_g_hash_policy = IS_ENABLED(CONFIG_SECURITY_APPARMOR_HASH_DEFAULT);
1401 #ifdef CONFIG_SECURITY_APPARMOR_HASH
1402 module_param_named(hash_policy, aa_g_hash_policy, aabool, S_IRUSR | S_IWUSR);
1403 #endif
1404
1405 /* whether policy exactly as loaded is retained for debug and checkpointing */
1406 bool aa_g_export_binary = IS_ENABLED(CONFIG_SECURITY_APPARMOR_EXPORT_BINARY);
1407 #ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY
1408 module_param_named(export_binary, aa_g_export_binary, aabool, 0600);
1409 #endif
1410
1411 /* policy loaddata compression level */
1412 int aa_g_rawdata_compression_level = AA_DEFAULT_CLEVEL;
1413 module_param_named(rawdata_compression_level, aa_g_rawdata_compression_level,
1414 aacompressionlevel, 0400);
1415
1416 /* Debug mode */
1417 bool aa_g_debug = IS_ENABLED(CONFIG_SECURITY_APPARMOR_DEBUG_MESSAGES);
1418 module_param_named(debug, aa_g_debug, aabool, S_IRUSR | S_IWUSR);
1419
1420 /* Audit mode */
1421 enum audit_mode aa_g_audit;
1422 module_param_call(audit, param_set_audit, param_get_audit,
1423 &aa_g_audit, S_IRUSR | S_IWUSR);
1424
1425 /* Determines if audit header is included in audited messages. This
1426 * provides more context if the audit daemon is not running
1427 */
1428 bool aa_g_audit_header = true;
1429 module_param_named(audit_header, aa_g_audit_header, aabool,
1430 S_IRUSR | S_IWUSR);
1431
1432 /* lock out loading/removal of policy
1433 * TODO: add in at boot loading of policy, which is the only way to
1434 * load policy, if lock_policy is set
1435 */
1436 bool aa_g_lock_policy;
1437 module_param_named(lock_policy, aa_g_lock_policy, aalockpolicy,
1438 S_IRUSR | S_IWUSR);
1439
1440 /* Syscall logging mode */
1441 bool aa_g_logsyscall;
1442 module_param_named(logsyscall, aa_g_logsyscall, aabool, S_IRUSR | S_IWUSR);
1443
1444 /* Maximum pathname length before accesses will start getting rejected */
1445 unsigned int aa_g_path_max = 2 * PATH_MAX;
1446 module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR);
1447
1448 /* Determines how paranoid loading of policy is and how much verification
1449 * on the loaded policy is done.
1450 * DEPRECATED: read only as strict checking of load is always done now
1451 * that none root users (user namespaces) can load policy.
1452 */
1453 bool aa_g_paranoid_load = IS_ENABLED(CONFIG_SECURITY_APPARMOR_PARANOID_LOAD);
1454 module_param_named(paranoid_load, aa_g_paranoid_load, aabool, S_IRUGO);
1455
1456 static int param_get_aaintbool(char *buffer, const struct kernel_param *kp);
1457 static int param_set_aaintbool(const char *val, const struct kernel_param *kp);
1458 #define param_check_aaintbool param_check_int
1459 static const struct kernel_param_ops param_ops_aaintbool = {
1460 .set = param_set_aaintbool,
1461 .get = param_get_aaintbool
1462 };
1463 /* Boot time disable flag */
1464 static int apparmor_enabled __ro_after_init = 1;
1465 module_param_named(enabled, apparmor_enabled, aaintbool, 0444);
1466
apparmor_enabled_setup(char * str)1467 static int __init apparmor_enabled_setup(char *str)
1468 {
1469 unsigned long enabled;
1470 int error = kstrtoul(str, 0, &enabled);
1471 if (!error)
1472 apparmor_enabled = enabled ? 1 : 0;
1473 return 1;
1474 }
1475
1476 __setup("apparmor=", apparmor_enabled_setup);
1477
1478 /* set global flag turning off the ability to load policy */
param_set_aalockpolicy(const char * val,const struct kernel_param * kp)1479 static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp)
1480 {
1481 if (!apparmor_enabled)
1482 return -EINVAL;
1483 if (apparmor_initialized && !aa_current_policy_admin_capable(NULL))
1484 return -EPERM;
1485 return param_set_bool(val, kp);
1486 }
1487
param_get_aalockpolicy(char * buffer,const struct kernel_param * kp)1488 static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp)
1489 {
1490 if (!apparmor_enabled)
1491 return -EINVAL;
1492 if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
1493 return -EPERM;
1494 return param_get_bool(buffer, kp);
1495 }
1496
param_set_aabool(const char * val,const struct kernel_param * kp)1497 static int param_set_aabool(const char *val, const struct kernel_param *kp)
1498 {
1499 if (!apparmor_enabled)
1500 return -EINVAL;
1501 if (apparmor_initialized && !aa_current_policy_admin_capable(NULL))
1502 return -EPERM;
1503 return param_set_bool(val, kp);
1504 }
1505
param_get_aabool(char * buffer,const struct kernel_param * kp)1506 static int param_get_aabool(char *buffer, const struct kernel_param *kp)
1507 {
1508 if (!apparmor_enabled)
1509 return -EINVAL;
1510 if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
1511 return -EPERM;
1512 return param_get_bool(buffer, kp);
1513 }
1514
param_set_aauint(const char * val,const struct kernel_param * kp)1515 static int param_set_aauint(const char *val, const struct kernel_param *kp)
1516 {
1517 int error;
1518
1519 if (!apparmor_enabled)
1520 return -EINVAL;
1521 /* file is ro but enforce 2nd line check */
1522 if (apparmor_initialized)
1523 return -EPERM;
1524
1525 error = param_set_uint(val, kp);
1526 aa_g_path_max = max_t(uint32_t, aa_g_path_max, sizeof(union aa_buffer));
1527 pr_info("AppArmor: buffer size set to %d bytes\n", aa_g_path_max);
1528
1529 return error;
1530 }
1531
param_get_aauint(char * buffer,const struct kernel_param * kp)1532 static int param_get_aauint(char *buffer, const struct kernel_param *kp)
1533 {
1534 if (!apparmor_enabled)
1535 return -EINVAL;
1536 if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
1537 return -EPERM;
1538 return param_get_uint(buffer, kp);
1539 }
1540
1541 /* Can only be set before AppArmor is initialized (i.e. on boot cmdline). */
param_set_aaintbool(const char * val,const struct kernel_param * kp)1542 static int param_set_aaintbool(const char *val, const struct kernel_param *kp)
1543 {
1544 struct kernel_param kp_local;
1545 bool value;
1546 int error;
1547
1548 if (apparmor_initialized)
1549 return -EPERM;
1550
1551 /* Create local copy, with arg pointing to bool type. */
1552 value = !!*((int *)kp->arg);
1553 memcpy(&kp_local, kp, sizeof(kp_local));
1554 kp_local.arg = &value;
1555
1556 error = param_set_bool(val, &kp_local);
1557 if (!error)
1558 *((int *)kp->arg) = *((bool *)kp_local.arg);
1559 return error;
1560 }
1561
1562 /*
1563 * To avoid changing /sys/module/apparmor/parameters/enabled from Y/N to
1564 * 1/0, this converts the "int that is actually bool" back to bool for
1565 * display in the /sys filesystem, while keeping it "int" for the LSM
1566 * infrastructure.
1567 */
param_get_aaintbool(char * buffer,const struct kernel_param * kp)1568 static int param_get_aaintbool(char *buffer, const struct kernel_param *kp)
1569 {
1570 struct kernel_param kp_local;
1571 bool value;
1572
1573 /* Create local copy, with arg pointing to bool type. */
1574 value = !!*((int *)kp->arg);
1575 memcpy(&kp_local, kp, sizeof(kp_local));
1576 kp_local.arg = &value;
1577
1578 return param_get_bool(buffer, &kp_local);
1579 }
1580
param_set_aacompressionlevel(const char * val,const struct kernel_param * kp)1581 static int param_set_aacompressionlevel(const char *val,
1582 const struct kernel_param *kp)
1583 {
1584 int error;
1585
1586 if (!apparmor_enabled)
1587 return -EINVAL;
1588 if (apparmor_initialized)
1589 return -EPERM;
1590
1591 error = param_set_int(val, kp);
1592
1593 aa_g_rawdata_compression_level = clamp(aa_g_rawdata_compression_level,
1594 AA_MIN_CLEVEL, AA_MAX_CLEVEL);
1595 pr_info("AppArmor: policy rawdata compression level set to %d\n",
1596 aa_g_rawdata_compression_level);
1597
1598 return error;
1599 }
1600
param_get_aacompressionlevel(char * buffer,const struct kernel_param * kp)1601 static int param_get_aacompressionlevel(char *buffer,
1602 const struct kernel_param *kp)
1603 {
1604 if (!apparmor_enabled)
1605 return -EINVAL;
1606 if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
1607 return -EPERM;
1608 return param_get_int(buffer, kp);
1609 }
1610
param_get_audit(char * buffer,const struct kernel_param * kp)1611 static int param_get_audit(char *buffer, const struct kernel_param *kp)
1612 {
1613 if (!apparmor_enabled)
1614 return -EINVAL;
1615 if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
1616 return -EPERM;
1617 return sprintf(buffer, "%s", audit_mode_names[aa_g_audit]);
1618 }
1619
param_set_audit(const char * val,const struct kernel_param * kp)1620 static int param_set_audit(const char *val, const struct kernel_param *kp)
1621 {
1622 int i;
1623
1624 if (!apparmor_enabled)
1625 return -EINVAL;
1626 if (!val)
1627 return -EINVAL;
1628 if (apparmor_initialized && !aa_current_policy_admin_capable(NULL))
1629 return -EPERM;
1630
1631 i = match_string(audit_mode_names, AUDIT_MAX_INDEX, val);
1632 if (i < 0)
1633 return -EINVAL;
1634
1635 aa_g_audit = i;
1636 return 0;
1637 }
1638
param_get_mode(char * buffer,const struct kernel_param * kp)1639 static int param_get_mode(char *buffer, const struct kernel_param *kp)
1640 {
1641 if (!apparmor_enabled)
1642 return -EINVAL;
1643 if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
1644 return -EPERM;
1645
1646 return sprintf(buffer, "%s", aa_profile_mode_names[aa_g_profile_mode]);
1647 }
1648
param_set_mode(const char * val,const struct kernel_param * kp)1649 static int param_set_mode(const char *val, const struct kernel_param *kp)
1650 {
1651 int i;
1652
1653 if (!apparmor_enabled)
1654 return -EINVAL;
1655 if (!val)
1656 return -EINVAL;
1657 if (apparmor_initialized && !aa_current_policy_admin_capable(NULL))
1658 return -EPERM;
1659
1660 i = match_string(aa_profile_mode_names, APPARMOR_MODE_NAMES_MAX_INDEX,
1661 val);
1662 if (i < 0)
1663 return -EINVAL;
1664
1665 aa_g_profile_mode = i;
1666 return 0;
1667 }
1668
aa_get_buffer(bool in_atomic)1669 char *aa_get_buffer(bool in_atomic)
1670 {
1671 union aa_buffer *aa_buf;
1672 bool try_again = true;
1673 gfp_t flags = (GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOWARN);
1674
1675 retry:
1676 spin_lock(&aa_buffers_lock);
1677 if (buffer_count > reserve_count ||
1678 (in_atomic && !list_empty(&aa_global_buffers))) {
1679 aa_buf = list_first_entry(&aa_global_buffers, union aa_buffer,
1680 list);
1681 list_del(&aa_buf->list);
1682 buffer_count--;
1683 spin_unlock(&aa_buffers_lock);
1684 return aa_buf->buffer;
1685 }
1686 if (in_atomic) {
1687 /*
1688 * out of reserve buffers and in atomic context so increase
1689 * how many buffers to keep in reserve
1690 */
1691 reserve_count++;
1692 flags = GFP_ATOMIC;
1693 }
1694 spin_unlock(&aa_buffers_lock);
1695
1696 if (!in_atomic)
1697 might_sleep();
1698 aa_buf = kmalloc(aa_g_path_max, flags);
1699 if (!aa_buf) {
1700 if (try_again) {
1701 try_again = false;
1702 goto retry;
1703 }
1704 pr_warn_once("AppArmor: Failed to allocate a memory buffer.\n");
1705 return NULL;
1706 }
1707 return aa_buf->buffer;
1708 }
1709
aa_put_buffer(char * buf)1710 void aa_put_buffer(char *buf)
1711 {
1712 union aa_buffer *aa_buf;
1713
1714 if (!buf)
1715 return;
1716 aa_buf = container_of(buf, union aa_buffer, buffer[0]);
1717
1718 spin_lock(&aa_buffers_lock);
1719 list_add(&aa_buf->list, &aa_global_buffers);
1720 buffer_count++;
1721 spin_unlock(&aa_buffers_lock);
1722 }
1723
1724 /*
1725 * AppArmor init functions
1726 */
1727
1728 /**
1729 * set_init_ctx - set a task context and profile on the first task.
1730 *
1731 * TODO: allow setting an alternate profile than unconfined
1732 */
set_init_ctx(void)1733 static int __init set_init_ctx(void)
1734 {
1735 struct cred *cred = (__force struct cred *)current->real_cred;
1736
1737 set_cred_label(cred, aa_get_label(ns_unconfined(root_ns)));
1738
1739 return 0;
1740 }
1741
destroy_buffers(void)1742 static void destroy_buffers(void)
1743 {
1744 union aa_buffer *aa_buf;
1745
1746 spin_lock(&aa_buffers_lock);
1747 while (!list_empty(&aa_global_buffers)) {
1748 aa_buf = list_first_entry(&aa_global_buffers, union aa_buffer,
1749 list);
1750 list_del(&aa_buf->list);
1751 spin_unlock(&aa_buffers_lock);
1752 kfree(aa_buf);
1753 spin_lock(&aa_buffers_lock);
1754 }
1755 spin_unlock(&aa_buffers_lock);
1756 }
1757
alloc_buffers(void)1758 static int __init alloc_buffers(void)
1759 {
1760 union aa_buffer *aa_buf;
1761 int i, num;
1762
1763 /*
1764 * A function may require two buffers at once. Usually the buffers are
1765 * used for a short period of time and are shared. On UP kernel buffers
1766 * two should be enough, with more CPUs it is possible that more
1767 * buffers will be used simultaneously. The preallocated pool may grow.
1768 * This preallocation has also the side-effect that AppArmor will be
1769 * disabled early at boot if aa_g_path_max is extremly high.
1770 */
1771 if (num_online_cpus() > 1)
1772 num = 4 + RESERVE_COUNT;
1773 else
1774 num = 2 + RESERVE_COUNT;
1775
1776 for (i = 0; i < num; i++) {
1777
1778 aa_buf = kmalloc(aa_g_path_max, GFP_KERNEL |
1779 __GFP_RETRY_MAYFAIL | __GFP_NOWARN);
1780 if (!aa_buf) {
1781 destroy_buffers();
1782 return -ENOMEM;
1783 }
1784 aa_put_buffer(aa_buf->buffer);
1785 }
1786 return 0;
1787 }
1788
1789 #ifdef CONFIG_SYSCTL
apparmor_dointvec(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)1790 static int apparmor_dointvec(struct ctl_table *table, int write,
1791 void *buffer, size_t *lenp, loff_t *ppos)
1792 {
1793 if (!aa_current_policy_admin_capable(NULL))
1794 return -EPERM;
1795 if (!apparmor_enabled)
1796 return -EINVAL;
1797
1798 return proc_dointvec(table, write, buffer, lenp, ppos);
1799 }
1800
1801 static struct ctl_table apparmor_sysctl_table[] = {
1802 {
1803 .procname = "unprivileged_userns_apparmor_policy",
1804 .data = &unprivileged_userns_apparmor_policy,
1805 .maxlen = sizeof(int),
1806 .mode = 0600,
1807 .proc_handler = apparmor_dointvec,
1808 },
1809 {
1810 .procname = "apparmor_display_secid_mode",
1811 .data = &apparmor_display_secid_mode,
1812 .maxlen = sizeof(int),
1813 .mode = 0600,
1814 .proc_handler = apparmor_dointvec,
1815 },
1816
1817 { }
1818 };
1819
apparmor_init_sysctl(void)1820 static int __init apparmor_init_sysctl(void)
1821 {
1822 return register_sysctl("kernel", apparmor_sysctl_table) ? 0 : -ENOMEM;
1823 }
1824 #else
apparmor_init_sysctl(void)1825 static inline int apparmor_init_sysctl(void)
1826 {
1827 return 0;
1828 }
1829 #endif /* CONFIG_SYSCTL */
1830
1831 #if defined(CONFIG_NETFILTER) && defined(CONFIG_NETWORK_SECMARK)
apparmor_ip_postroute(void * priv,struct sk_buff * skb,const struct nf_hook_state * state)1832 static unsigned int apparmor_ip_postroute(void *priv,
1833 struct sk_buff *skb,
1834 const struct nf_hook_state *state)
1835 {
1836 struct aa_sk_ctx *ctx;
1837 struct sock *sk;
1838
1839 if (!skb->secmark)
1840 return NF_ACCEPT;
1841
1842 sk = skb_to_full_sk(skb);
1843 if (sk == NULL)
1844 return NF_ACCEPT;
1845
1846 ctx = SK_CTX(sk);
1847 if (!apparmor_secmark_check(ctx->label, OP_SENDMSG, AA_MAY_SEND,
1848 skb->secmark, sk))
1849 return NF_ACCEPT;
1850
1851 return NF_DROP_ERR(-ECONNREFUSED);
1852
1853 }
1854
1855 static const struct nf_hook_ops apparmor_nf_ops[] = {
1856 {
1857 .hook = apparmor_ip_postroute,
1858 .pf = NFPROTO_IPV4,
1859 .hooknum = NF_INET_POST_ROUTING,
1860 .priority = NF_IP_PRI_SELINUX_FIRST,
1861 },
1862 #if IS_ENABLED(CONFIG_IPV6)
1863 {
1864 .hook = apparmor_ip_postroute,
1865 .pf = NFPROTO_IPV6,
1866 .hooknum = NF_INET_POST_ROUTING,
1867 .priority = NF_IP6_PRI_SELINUX_FIRST,
1868 },
1869 #endif
1870 };
1871
apparmor_nf_register(struct net * net)1872 static int __net_init apparmor_nf_register(struct net *net)
1873 {
1874 return nf_register_net_hooks(net, apparmor_nf_ops,
1875 ARRAY_SIZE(apparmor_nf_ops));
1876 }
1877
apparmor_nf_unregister(struct net * net)1878 static void __net_exit apparmor_nf_unregister(struct net *net)
1879 {
1880 nf_unregister_net_hooks(net, apparmor_nf_ops,
1881 ARRAY_SIZE(apparmor_nf_ops));
1882 }
1883
1884 static struct pernet_operations apparmor_net_ops = {
1885 .init = apparmor_nf_register,
1886 .exit = apparmor_nf_unregister,
1887 };
1888
apparmor_nf_ip_init(void)1889 static int __init apparmor_nf_ip_init(void)
1890 {
1891 int err;
1892
1893 if (!apparmor_enabled)
1894 return 0;
1895
1896 err = register_pernet_subsys(&apparmor_net_ops);
1897 if (err)
1898 panic("Apparmor: register_pernet_subsys: error %d\n", err);
1899
1900 return 0;
1901 }
1902 __initcall(apparmor_nf_ip_init);
1903 #endif
1904
apparmor_init(void)1905 static int __init apparmor_init(void)
1906 {
1907 int error;
1908
1909 error = aa_setup_dfa_engine();
1910 if (error) {
1911 AA_ERROR("Unable to setup dfa engine\n");
1912 goto alloc_out;
1913 }
1914
1915 error = aa_alloc_root_ns();
1916 if (error) {
1917 AA_ERROR("Unable to allocate default profile namespace\n");
1918 goto alloc_out;
1919 }
1920
1921 error = apparmor_init_sysctl();
1922 if (error) {
1923 AA_ERROR("Unable to register sysctls\n");
1924 goto alloc_out;
1925
1926 }
1927
1928 error = alloc_buffers();
1929 if (error) {
1930 AA_ERROR("Unable to allocate work buffers\n");
1931 goto alloc_out;
1932 }
1933
1934 error = set_init_ctx();
1935 if (error) {
1936 AA_ERROR("Failed to set context on init task\n");
1937 aa_free_root_ns();
1938 goto buffers_out;
1939 }
1940 security_add_hooks(apparmor_hooks, ARRAY_SIZE(apparmor_hooks),
1941 "apparmor");
1942
1943 /* Report that AppArmor successfully initialized */
1944 apparmor_initialized = 1;
1945 if (aa_g_profile_mode == APPARMOR_COMPLAIN)
1946 aa_info_message("AppArmor initialized: complain mode enabled");
1947 else if (aa_g_profile_mode == APPARMOR_KILL)
1948 aa_info_message("AppArmor initialized: kill mode enabled");
1949 else
1950 aa_info_message("AppArmor initialized");
1951
1952 return error;
1953
1954 buffers_out:
1955 destroy_buffers();
1956 alloc_out:
1957 aa_destroy_aafs();
1958 aa_teardown_dfa_engine();
1959
1960 apparmor_enabled = false;
1961 return error;
1962 }
1963
1964 DEFINE_LSM(apparmor) = {
1965 .name = "apparmor",
1966 .flags = LSM_FLAG_LEGACY_MAJOR | LSM_FLAG_EXCLUSIVE,
1967 .enabled = &apparmor_enabled,
1968 .blobs = &apparmor_blob_sizes,
1969 .init = apparmor_init,
1970 };
1971