blob: ad05d391974dc1b83e67f7297324fc260a9a99da [file] [log] [blame]
John Johansenb5e95b42010-07-29 14:48:07 -07001/*
2 * AppArmor security module
3 *
4 * This file contains AppArmor LSM hooks.
5 *
6 * Copyright (C) 1998-2008 Novell/SUSE
7 * Copyright 2009-2010 Canonical Ltd.
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation, version 2 of the
12 * License.
13 */
14
15#include <linux/security.h>
16#include <linux/moduleparam.h>
17#include <linux/mm.h>
18#include <linux/mman.h>
19#include <linux/mount.h>
20#include <linux/namei.h>
21#include <linux/ptrace.h>
22#include <linux/ctype.h>
23#include <linux/sysctl.h>
24#include <linux/audit.h>
Serge E. Hallyn34867402011-03-23 16:43:17 -070025#include <linux/user_namespace.h>
John Johansenb5e95b42010-07-29 14:48:07 -070026#include <net/sock.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/context.h"
33#include "include/file.h"
34#include "include/ipc.h"
35#include "include/path.h"
36#include "include/policy.h"
37#include "include/procattr.h"
38
39/* Flag indicating whether initialization completed */
40int apparmor_initialized __initdata;
41
42/*
43 * LSM hook functions
44 */
45
46/*
47 * free the associated aa_task_cxt and put its profiles
48 */
49static void apparmor_cred_free(struct cred *cred)
50{
51 aa_free_task_context(cred->security);
52 cred->security = NULL;
53}
54
55/*
56 * allocate the apparmor part of blank credentials
57 */
58static int apparmor_cred_alloc_blank(struct cred *cred, gfp_t gfp)
59{
60 /* freed by apparmor_cred_free */
61 struct aa_task_cxt *cxt = aa_alloc_task_context(gfp);
62 if (!cxt)
63 return -ENOMEM;
64
65 cred->security = cxt;
66 return 0;
67}
68
69/*
70 * prepare new aa_task_cxt for modification by prepare_cred block
71 */
72static int apparmor_cred_prepare(struct cred *new, const struct cred *old,
73 gfp_t gfp)
74{
75 /* freed by apparmor_cred_free */
76 struct aa_task_cxt *cxt = aa_alloc_task_context(gfp);
77 if (!cxt)
78 return -ENOMEM;
79
80 aa_dup_task_context(cxt, old->security);
81 new->security = cxt;
82 return 0;
83}
84
85/*
86 * transfer the apparmor data to a blank set of creds
87 */
88static void apparmor_cred_transfer(struct cred *new, const struct cred *old)
89{
90 const struct aa_task_cxt *old_cxt = old->security;
91 struct aa_task_cxt *new_cxt = new->security;
92
93 aa_dup_task_context(new_cxt, old_cxt);
94}
95
96static int apparmor_ptrace_access_check(struct task_struct *child,
97 unsigned int mode)
98{
99 int error = cap_ptrace_access_check(child, mode);
100 if (error)
101 return error;
102
103 return aa_ptrace(current, child, mode);
104}
105
106static int apparmor_ptrace_traceme(struct task_struct *parent)
107{
108 int error = cap_ptrace_traceme(parent);
109 if (error)
110 return error;
111
112 return aa_ptrace(parent, current, PTRACE_MODE_ATTACH);
113}
114
115/* Derived from security/commoncap.c:cap_capget */
116static int apparmor_capget(struct task_struct *target, kernel_cap_t *effective,
117 kernel_cap_t *inheritable, kernel_cap_t *permitted)
118{
119 struct aa_profile *profile;
120 const struct cred *cred;
121
122 rcu_read_lock();
123 cred = __task_cred(target);
124 profile = aa_cred_profile(cred);
125
126 *effective = cred->cap_effective;
127 *inheritable = cred->cap_inheritable;
128 *permitted = cred->cap_permitted;
129
John Johansen25e75df2011-06-25 16:57:07 +0100130 if (!unconfined(profile) && !COMPLAIN_MODE(profile)) {
John Johansenb5e95b42010-07-29 14:48:07 -0700131 *effective = cap_intersect(*effective, profile->caps.allow);
132 *permitted = cap_intersect(*permitted, profile->caps.allow);
133 }
134 rcu_read_unlock();
135
136 return 0;
137}
138
Eric Paris6a9de492012-01-03 12:25:14 -0500139static int apparmor_capable(const struct cred *cred, struct user_namespace *ns,
140 int cap, int audit)
John Johansenb5e95b42010-07-29 14:48:07 -0700141{
142 struct aa_profile *profile;
143 /* cap_capable returns 0 on success, else -EPERM */
Eric Paris6a9de492012-01-03 12:25:14 -0500144 int error = cap_capable(cred, ns, cap, audit);
John Johansenb5e95b42010-07-29 14:48:07 -0700145 if (!error) {
146 profile = aa_cred_profile(cred);
147 if (!unconfined(profile))
Eric Paris6a9de492012-01-03 12:25:14 -0500148 error = aa_capable(current, profile, cap, audit);
John Johansenb5e95b42010-07-29 14:48:07 -0700149 }
150 return error;
151}
152
153/**
154 * common_perm - basic common permission check wrapper fn for paths
155 * @op: operation being checked
156 * @path: path to check permission of (NOT NULL)
157 * @mask: requested permissions mask
158 * @cond: conditional info for the permission request (NOT NULL)
159 *
160 * Returns: %0 else error code if error or permission denied
161 */
162static int common_perm(int op, struct path *path, u32 mask,
163 struct path_cond *cond)
164{
165 struct aa_profile *profile;
166 int error = 0;
167
168 profile = __aa_current_profile();
169 if (!unconfined(profile))
170 error = aa_path_perm(op, profile, path, 0, mask, cond);
171
172 return error;
173}
174
175/**
176 * common_perm_dir_dentry - common permission wrapper when path is dir, dentry
177 * @op: operation being checked
178 * @dir: directory of the dentry (NOT NULL)
179 * @dentry: dentry to check (NOT NULL)
180 * @mask: requested permissions mask
181 * @cond: conditional info for the permission request (NOT NULL)
182 *
183 * Returns: %0 else error code if error or permission denied
184 */
185static int common_perm_dir_dentry(int op, struct path *dir,
186 struct dentry *dentry, u32 mask,
187 struct path_cond *cond)
188{
189 struct path path = { dir->mnt, dentry };
190
191 return common_perm(op, &path, mask, cond);
192}
193
194/**
195 * common_perm_mnt_dentry - common permission wrapper when mnt, dentry
196 * @op: operation being checked
197 * @mnt: mount point of dentry (NOT NULL)
198 * @dentry: dentry to check (NOT NULL)
199 * @mask: requested permissions mask
200 *
201 * Returns: %0 else error code if error or permission denied
202 */
203static int common_perm_mnt_dentry(int op, struct vfsmount *mnt,
204 struct dentry *dentry, u32 mask)
205{
206 struct path path = { mnt, dentry };
207 struct path_cond cond = { dentry->d_inode->i_uid,
208 dentry->d_inode->i_mode
209 };
210
211 return common_perm(op, &path, mask, &cond);
212}
213
214/**
215 * common_perm_rm - common permission wrapper for operations doing rm
216 * @op: operation being checked
217 * @dir: directory that the dentry is in (NOT NULL)
218 * @dentry: dentry being rm'd (NOT NULL)
219 * @mask: requested permission mask
220 *
221 * Returns: %0 else error code if error or permission denied
222 */
223static int common_perm_rm(int op, struct path *dir,
224 struct dentry *dentry, u32 mask)
225{
226 struct inode *inode = dentry->d_inode;
227 struct path_cond cond = { };
228
229 if (!inode || !dir->mnt || !mediated_filesystem(inode))
230 return 0;
231
232 cond.uid = inode->i_uid;
233 cond.mode = inode->i_mode;
234
235 return common_perm_dir_dentry(op, dir, dentry, mask, &cond);
236}
237
238/**
239 * common_perm_create - common permission wrapper for operations doing create
240 * @op: operation being checked
241 * @dir: directory that dentry will be created in (NOT NULL)
242 * @dentry: dentry to create (NOT NULL)
243 * @mask: request permission mask
244 * @mode: created file mode
245 *
246 * Returns: %0 else error code if error or permission denied
247 */
248static int common_perm_create(int op, struct path *dir, struct dentry *dentry,
249 u32 mask, umode_t mode)
250{
251 struct path_cond cond = { current_fsuid(), mode };
252
253 if (!dir->mnt || !mediated_filesystem(dir->dentry->d_inode))
254 return 0;
255
256 return common_perm_dir_dentry(op, dir, dentry, mask, &cond);
257}
258
259static int apparmor_path_unlink(struct path *dir, struct dentry *dentry)
260{
261 return common_perm_rm(OP_UNLINK, dir, dentry, AA_MAY_DELETE);
262}
263
264static int apparmor_path_mkdir(struct path *dir, struct dentry *dentry,
Al Viro4572bef2011-11-21 14:56:21 -0500265 umode_t mode)
John Johansenb5e95b42010-07-29 14:48:07 -0700266{
267 return common_perm_create(OP_MKDIR, dir, dentry, AA_MAY_CREATE,
268 S_IFDIR);
269}
270
271static int apparmor_path_rmdir(struct path *dir, struct dentry *dentry)
272{
273 return common_perm_rm(OP_RMDIR, dir, dentry, AA_MAY_DELETE);
274}
275
276static int apparmor_path_mknod(struct path *dir, struct dentry *dentry,
Al Viro04fc66e2011-11-21 14:58:38 -0500277 umode_t mode, unsigned int dev)
John Johansenb5e95b42010-07-29 14:48:07 -0700278{
279 return common_perm_create(OP_MKNOD, dir, dentry, AA_MAY_CREATE, mode);
280}
281
James Morris4d6ec102010-07-30 09:02:04 +1000282static int apparmor_path_truncate(struct path *path)
John Johansenb5e95b42010-07-29 14:48:07 -0700283{
284 struct path_cond cond = { path->dentry->d_inode->i_uid,
285 path->dentry->d_inode->i_mode
286 };
287
288 if (!path->mnt || !mediated_filesystem(path->dentry->d_inode))
289 return 0;
290
291 return common_perm(OP_TRUNC, path, MAY_WRITE | AA_MAY_META_WRITE,
292 &cond);
293}
294
295static int apparmor_path_symlink(struct path *dir, struct dentry *dentry,
296 const char *old_name)
297{
298 return common_perm_create(OP_SYMLINK, dir, dentry, AA_MAY_CREATE,
299 S_IFLNK);
300}
301
302static int apparmor_path_link(struct dentry *old_dentry, struct path *new_dir,
303 struct dentry *new_dentry)
304{
305 struct aa_profile *profile;
306 int error = 0;
307
308 if (!mediated_filesystem(old_dentry->d_inode))
309 return 0;
310
311 profile = aa_current_profile();
312 if (!unconfined(profile))
313 error = aa_path_link(profile, old_dentry, new_dir, new_dentry);
314 return error;
315}
316
317static int apparmor_path_rename(struct path *old_dir, struct dentry *old_dentry,
318 struct path *new_dir, struct dentry *new_dentry)
319{
320 struct aa_profile *profile;
321 int error = 0;
322
323 if (!mediated_filesystem(old_dentry->d_inode))
324 return 0;
325
326 profile = aa_current_profile();
327 if (!unconfined(profile)) {
328 struct path old_path = { old_dir->mnt, old_dentry };
329 struct path new_path = { new_dir->mnt, new_dentry };
330 struct path_cond cond = { old_dentry->d_inode->i_uid,
331 old_dentry->d_inode->i_mode
332 };
333
334 error = aa_path_perm(OP_RENAME_SRC, profile, &old_path, 0,
335 MAY_READ | AA_MAY_META_READ | MAY_WRITE |
336 AA_MAY_META_WRITE | AA_MAY_DELETE,
337 &cond);
338 if (!error)
339 error = aa_path_perm(OP_RENAME_DEST, profile, &new_path,
340 0, MAY_WRITE | AA_MAY_META_WRITE |
341 AA_MAY_CREATE, &cond);
342
343 }
344 return error;
345}
346
Al Virocdcf1162011-12-08 10:51:53 -0500347static int apparmor_path_chmod(struct path *path, umode_t mode)
John Johansenb5e95b42010-07-29 14:48:07 -0700348{
Al Virocdcf1162011-12-08 10:51:53 -0500349 if (!mediated_filesystem(path->dentry->d_inode))
John Johansenb5e95b42010-07-29 14:48:07 -0700350 return 0;
351
Al Virocdcf1162011-12-08 10:51:53 -0500352 return common_perm_mnt_dentry(OP_CHMOD, path->mnt, path->dentry, AA_MAY_CHMOD);
John Johansenb5e95b42010-07-29 14:48:07 -0700353}
354
355static int apparmor_path_chown(struct path *path, uid_t uid, gid_t gid)
356{
357 struct path_cond cond = { path->dentry->d_inode->i_uid,
358 path->dentry->d_inode->i_mode
359 };
360
361 if (!mediated_filesystem(path->dentry->d_inode))
362 return 0;
363
364 return common_perm(OP_CHOWN, path, AA_MAY_CHOWN, &cond);
365}
366
367static int apparmor_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
368{
369 if (!mediated_filesystem(dentry->d_inode))
370 return 0;
371
372 return common_perm_mnt_dentry(OP_GETATTR, mnt, dentry,
373 AA_MAY_META_READ);
374}
375
376static int apparmor_dentry_open(struct file *file, const struct cred *cred)
377{
378 struct aa_file_cxt *fcxt = file->f_security;
379 struct aa_profile *profile;
380 int error = 0;
381
382 if (!mediated_filesystem(file->f_path.dentry->d_inode))
383 return 0;
384
385 /* If in exec, permission is handled by bprm hooks.
386 * Cache permissions granted by the previous exec check, with
387 * implicit read and executable mmap which are required to
388 * actually execute the image.
389 */
390 if (current->in_execve) {
391 fcxt->allow = MAY_EXEC | MAY_READ | AA_EXEC_MMAP;
392 return 0;
393 }
394
395 profile = aa_cred_profile(cred);
396 if (!unconfined(profile)) {
397 struct inode *inode = file->f_path.dentry->d_inode;
398 struct path_cond cond = { inode->i_uid, inode->i_mode };
399
400 error = aa_path_perm(OP_OPEN, profile, &file->f_path, 0,
401 aa_map_file_to_perms(file), &cond);
402 /* todo cache full allowed permissions set and state */
403 fcxt->allow = aa_map_file_to_perms(file);
404 }
405
406 return error;
407}
408
409static int apparmor_file_alloc_security(struct file *file)
410{
411 /* freed by apparmor_file_free_security */
412 file->f_security = aa_alloc_file_context(GFP_KERNEL);
413 if (!file->f_security)
414 return -ENOMEM;
415 return 0;
416
417}
418
419static void apparmor_file_free_security(struct file *file)
420{
421 struct aa_file_cxt *cxt = file->f_security;
422
423 aa_free_file_context(cxt);
424}
425
426static int common_file_perm(int op, struct file *file, u32 mask)
427{
428 struct aa_file_cxt *fcxt = file->f_security;
429 struct aa_profile *profile, *fprofile = aa_cred_profile(file->f_cred);
430 int error = 0;
431
432 BUG_ON(!fprofile);
433
434 if (!file->f_path.mnt ||
435 !mediated_filesystem(file->f_path.dentry->d_inode))
436 return 0;
437
438 profile = __aa_current_profile();
439
440 /* revalidate access, if task is unconfined, or the cached cred
441 * doesn't match or if the request is for more permissions than
442 * was granted.
443 *
444 * Note: the test for !unconfined(fprofile) is to handle file
445 * delegation from unconfined tasks
446 */
447 if (!unconfined(profile) && !unconfined(fprofile) &&
448 ((fprofile != profile) || (mask & ~fcxt->allow)))
449 error = aa_file_perm(op, profile, file, mask);
450
451 return error;
452}
453
454static int apparmor_file_permission(struct file *file, int mask)
455{
456 return common_file_perm(OP_FPERM, file, mask);
457}
458
459static int apparmor_file_lock(struct file *file, unsigned int cmd)
460{
461 u32 mask = AA_MAY_LOCK;
462
463 if (cmd == F_WRLCK)
464 mask |= MAY_WRITE;
465
466 return common_file_perm(OP_FLOCK, file, mask);
467}
468
469static int common_mmap(int op, struct file *file, unsigned long prot,
470 unsigned long flags)
471{
472 struct dentry *dentry;
473 int mask = 0;
474
475 if (!file || !file->f_security)
476 return 0;
477
478 if (prot & PROT_READ)
479 mask |= MAY_READ;
480 /*
481 * Private mappings don't require write perms since they don't
482 * write back to the files
483 */
484 if ((prot & PROT_WRITE) && !(flags & MAP_PRIVATE))
485 mask |= MAY_WRITE;
486 if (prot & PROT_EXEC)
487 mask |= AA_EXEC_MMAP;
488
489 dentry = file->f_path.dentry;
490 return common_file_perm(op, file, mask);
491}
492
493static int apparmor_file_mmap(struct file *file, unsigned long reqprot,
494 unsigned long prot, unsigned long flags,
495 unsigned long addr, unsigned long addr_only)
496{
497 int rc = 0;
498
499 /* do DAC check */
500 rc = cap_file_mmap(file, reqprot, prot, flags, addr, addr_only);
501 if (rc || addr_only)
502 return rc;
503
504 return common_mmap(OP_FMMAP, file, prot, flags);
505}
506
507static int apparmor_file_mprotect(struct vm_area_struct *vma,
508 unsigned long reqprot, unsigned long prot)
509{
510 return common_mmap(OP_FMPROT, vma->vm_file, prot,
511 !(vma->vm_flags & VM_SHARED) ? MAP_PRIVATE : 0);
512}
513
514static int apparmor_getprocattr(struct task_struct *task, char *name,
515 char **value)
516{
517 int error = -ENOENT;
518 struct aa_profile *profile;
519 /* released below */
520 const struct cred *cred = get_task_cred(task);
521 struct aa_task_cxt *cxt = cred->security;
522 profile = aa_cred_profile(cred);
523
524 if (strcmp(name, "current") == 0)
525 error = aa_getprocattr(aa_newest_version(cxt->profile),
526 value);
527 else if (strcmp(name, "prev") == 0 && cxt->previous)
528 error = aa_getprocattr(aa_newest_version(cxt->previous),
529 value);
530 else if (strcmp(name, "exec") == 0 && cxt->onexec)
531 error = aa_getprocattr(aa_newest_version(cxt->onexec),
532 value);
533 else
534 error = -EINVAL;
535
536 put_cred(cred);
537
538 return error;
539}
540
541static int apparmor_setprocattr(struct task_struct *task, char *name,
542 void *value, size_t size)
543{
544 char *command, *args = value;
545 size_t arg_size;
546 int error;
547
548 if (size == 0)
549 return -EINVAL;
550 /* args points to a PAGE_SIZE buffer, AppArmor requires that
551 * the buffer must be null terminated or have size <= PAGE_SIZE -1
552 * so that AppArmor can null terminate them
553 */
554 if (args[size - 1] != '\0') {
555 if (size == PAGE_SIZE)
556 return -EINVAL;
557 args[size] = '\0';
558 }
559
560 /* task can only write its own attributes */
561 if (current != task)
562 return -EACCES;
563
564 args = value;
565 args = strim(args);
566 command = strsep(&args, " ");
567 if (!args)
568 return -EINVAL;
569 args = skip_spaces(args);
570 if (!*args)
571 return -EINVAL;
572
573 arg_size = size - (args - (char *) value);
574 if (strcmp(name, "current") == 0) {
575 if (strcmp(command, "changehat") == 0) {
576 error = aa_setprocattr_changehat(args, arg_size,
577 !AA_DO_TEST);
578 } else if (strcmp(command, "permhat") == 0) {
579 error = aa_setprocattr_changehat(args, arg_size,
580 AA_DO_TEST);
581 } else if (strcmp(command, "changeprofile") == 0) {
582 error = aa_setprocattr_changeprofile(args, !AA_ONEXEC,
583 !AA_DO_TEST);
584 } else if (strcmp(command, "permprofile") == 0) {
585 error = aa_setprocattr_changeprofile(args, !AA_ONEXEC,
586 AA_DO_TEST);
587 } else if (strcmp(command, "permipc") == 0) {
588 error = aa_setprocattr_permipc(args);
589 } else {
590 struct common_audit_data sa;
Eric Paris3b3b0e42012-04-03 09:37:02 -0700591 struct apparmor_audit_data aad = {0,};
John Johansenb5e95b42010-07-29 14:48:07 -0700592 COMMON_AUDIT_DATA_INIT(&sa, NONE);
Eric Paris3b3b0e42012-04-03 09:37:02 -0700593 sa.aad = &aad;
594 aad.op = OP_SETPROCATTR;
595 aad.info = name;
596 aad.error = -EINVAL;
Kees Cooka5b2c5b2011-05-31 11:31:41 -0700597 return aa_audit(AUDIT_APPARMOR_DENIED,
598 __aa_current_profile(), GFP_KERNEL,
John Johansenb5e95b42010-07-29 14:48:07 -0700599 &sa, NULL);
600 }
601 } else if (strcmp(name, "exec") == 0) {
602 error = aa_setprocattr_changeprofile(args, AA_ONEXEC,
603 !AA_DO_TEST);
604 } else {
605 /* only support the "current" and "exec" process attributes */
606 return -EINVAL;
607 }
608 if (!error)
609 error = size;
610 return error;
611}
612
Jiri Slaby7cb4dc92010-08-11 11:28:02 +0200613static int apparmor_task_setrlimit(struct task_struct *task,
614 unsigned int resource, struct rlimit *new_rlim)
John Johansenb5e95b42010-07-29 14:48:07 -0700615{
John Johansen1780f2d2011-06-08 15:07:47 -0700616 struct aa_profile *profile = __aa_current_profile();
John Johansenb5e95b42010-07-29 14:48:07 -0700617 int error = 0;
618
619 if (!unconfined(profile))
John Johansen3a2dc832010-09-06 10:10:20 -0700620 error = aa_task_setrlimit(profile, task, resource, new_rlim);
John Johansenb5e95b42010-07-29 14:48:07 -0700621
622 return error;
623}
624
625static struct security_operations apparmor_ops = {
626 .name = "apparmor",
627
628 .ptrace_access_check = apparmor_ptrace_access_check,
629 .ptrace_traceme = apparmor_ptrace_traceme,
630 .capget = apparmor_capget,
631 .capable = apparmor_capable,
632
633 .path_link = apparmor_path_link,
634 .path_unlink = apparmor_path_unlink,
635 .path_symlink = apparmor_path_symlink,
636 .path_mkdir = apparmor_path_mkdir,
637 .path_rmdir = apparmor_path_rmdir,
638 .path_mknod = apparmor_path_mknod,
639 .path_rename = apparmor_path_rename,
640 .path_chmod = apparmor_path_chmod,
641 .path_chown = apparmor_path_chown,
642 .path_truncate = apparmor_path_truncate,
643 .dentry_open = apparmor_dentry_open,
644 .inode_getattr = apparmor_inode_getattr,
645
646 .file_permission = apparmor_file_permission,
647 .file_alloc_security = apparmor_file_alloc_security,
648 .file_free_security = apparmor_file_free_security,
649 .file_mmap = apparmor_file_mmap,
650 .file_mprotect = apparmor_file_mprotect,
651 .file_lock = apparmor_file_lock,
652
653 .getprocattr = apparmor_getprocattr,
654 .setprocattr = apparmor_setprocattr,
655
656 .cred_alloc_blank = apparmor_cred_alloc_blank,
657 .cred_free = apparmor_cred_free,
658 .cred_prepare = apparmor_cred_prepare,
659 .cred_transfer = apparmor_cred_transfer,
660
661 .bprm_set_creds = apparmor_bprm_set_creds,
662 .bprm_committing_creds = apparmor_bprm_committing_creds,
663 .bprm_committed_creds = apparmor_bprm_committed_creds,
664 .bprm_secureexec = apparmor_bprm_secureexec,
665
666 .task_setrlimit = apparmor_task_setrlimit,
667};
668
669/*
670 * AppArmor sysfs module parameters
671 */
672
Stephen Rothwell101d6c82010-08-02 12:00:43 +1000673static int param_set_aabool(const char *val, const struct kernel_param *kp);
674static int param_get_aabool(char *buffer, const struct kernel_param *kp);
Rusty Russellb8aa09f2011-12-15 13:41:32 +1030675#define param_check_aabool param_check_bool
Stephen Rothwell101d6c82010-08-02 12:00:43 +1000676static struct kernel_param_ops param_ops_aabool = {
677 .set = param_set_aabool,
678 .get = param_get_aabool
679};
John Johansenb5e95b42010-07-29 14:48:07 -0700680
Stephen Rothwell101d6c82010-08-02 12:00:43 +1000681static int param_set_aauint(const char *val, const struct kernel_param *kp);
682static int param_get_aauint(char *buffer, const struct kernel_param *kp);
Rusty Russellb8aa09f2011-12-15 13:41:32 +1030683#define param_check_aauint param_check_uint
Stephen Rothwell101d6c82010-08-02 12:00:43 +1000684static struct kernel_param_ops param_ops_aauint = {
685 .set = param_set_aauint,
686 .get = param_get_aauint
687};
John Johansenb5e95b42010-07-29 14:48:07 -0700688
Stephen Rothwell101d6c82010-08-02 12:00:43 +1000689static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp);
690static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp);
Rusty Russellb8aa09f2011-12-15 13:41:32 +1030691#define param_check_aalockpolicy param_check_bool
Stephen Rothwell101d6c82010-08-02 12:00:43 +1000692static struct kernel_param_ops param_ops_aalockpolicy = {
693 .set = param_set_aalockpolicy,
694 .get = param_get_aalockpolicy
695};
John Johansenb5e95b42010-07-29 14:48:07 -0700696
697static int param_set_audit(const char *val, struct kernel_param *kp);
698static int param_get_audit(char *buffer, struct kernel_param *kp);
John Johansenb5e95b42010-07-29 14:48:07 -0700699
700static int param_set_mode(const char *val, struct kernel_param *kp);
701static int param_get_mode(char *buffer, struct kernel_param *kp);
John Johansenb5e95b42010-07-29 14:48:07 -0700702
703/* Flag values, also controllable via /sys/module/apparmor/parameters
704 * We define special types as we want to do additional mediation.
705 */
706
707/* AppArmor global enforcement switch - complain, enforce, kill */
708enum profile_mode aa_g_profile_mode = APPARMOR_ENFORCE;
709module_param_call(mode, param_set_mode, param_get_mode,
710 &aa_g_profile_mode, S_IRUSR | S_IWUSR);
711
712/* Debug mode */
Rusty Russell90ab5ee2012-01-13 09:32:20 +1030713bool aa_g_debug;
John Johansenb5e95b42010-07-29 14:48:07 -0700714module_param_named(debug, aa_g_debug, aabool, S_IRUSR | S_IWUSR);
715
716/* Audit mode */
717enum audit_mode aa_g_audit;
718module_param_call(audit, param_set_audit, param_get_audit,
719 &aa_g_audit, S_IRUSR | S_IWUSR);
720
721/* Determines if audit header is included in audited messages. This
722 * provides more context if the audit daemon is not running
723 */
Rusty Russell90ab5ee2012-01-13 09:32:20 +1030724bool aa_g_audit_header = 1;
John Johansenb5e95b42010-07-29 14:48:07 -0700725module_param_named(audit_header, aa_g_audit_header, aabool,
726 S_IRUSR | S_IWUSR);
727
728/* lock out loading/removal of policy
729 * TODO: add in at boot loading of policy, which is the only way to
730 * load policy, if lock_policy is set
731 */
Rusty Russell90ab5ee2012-01-13 09:32:20 +1030732bool aa_g_lock_policy;
John Johansenb5e95b42010-07-29 14:48:07 -0700733module_param_named(lock_policy, aa_g_lock_policy, aalockpolicy,
734 S_IRUSR | S_IWUSR);
735
736/* Syscall logging mode */
Rusty Russell90ab5ee2012-01-13 09:32:20 +1030737bool aa_g_logsyscall;
John Johansenb5e95b42010-07-29 14:48:07 -0700738module_param_named(logsyscall, aa_g_logsyscall, aabool, S_IRUSR | S_IWUSR);
739
740/* Maximum pathname length before accesses will start getting rejected */
741unsigned int aa_g_path_max = 2 * PATH_MAX;
742module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR | S_IWUSR);
743
744/* Determines how paranoid loading of policy is and how much verification
745 * on the loaded policy is done.
746 */
Rusty Russell90ab5ee2012-01-13 09:32:20 +1030747bool aa_g_paranoid_load = 1;
John Johansenb5e95b42010-07-29 14:48:07 -0700748module_param_named(paranoid_load, aa_g_paranoid_load, aabool,
749 S_IRUSR | S_IWUSR);
750
751/* Boot time disable flag */
Rusty Russell90ab5ee2012-01-13 09:32:20 +1030752static bool apparmor_enabled = CONFIG_SECURITY_APPARMOR_BOOTPARAM_VALUE;
John Johansenb5e95b42010-07-29 14:48:07 -0700753module_param_named(enabled, apparmor_enabled, aabool, S_IRUSR);
754
755static int __init apparmor_enabled_setup(char *str)
756{
757 unsigned long enabled;
758 int error = strict_strtoul(str, 0, &enabled);
759 if (!error)
760 apparmor_enabled = enabled ? 1 : 0;
761 return 1;
762}
763
764__setup("apparmor=", apparmor_enabled_setup);
765
766/* set global flag turning off the ability to load policy */
Stephen Rothwell101d6c82010-08-02 12:00:43 +1000767static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp)
John Johansenb5e95b42010-07-29 14:48:07 -0700768{
769 if (!capable(CAP_MAC_ADMIN))
770 return -EPERM;
771 if (aa_g_lock_policy)
772 return -EACCES;
773 return param_set_bool(val, kp);
774}
775
Stephen Rothwell101d6c82010-08-02 12:00:43 +1000776static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp)
John Johansenb5e95b42010-07-29 14:48:07 -0700777{
778 if (!capable(CAP_MAC_ADMIN))
779 return -EPERM;
780 return param_get_bool(buffer, kp);
781}
782
Stephen Rothwell101d6c82010-08-02 12:00:43 +1000783static int param_set_aabool(const char *val, const struct kernel_param *kp)
John Johansenb5e95b42010-07-29 14:48:07 -0700784{
785 if (!capable(CAP_MAC_ADMIN))
786 return -EPERM;
787 return param_set_bool(val, kp);
788}
789
Stephen Rothwell101d6c82010-08-02 12:00:43 +1000790static int param_get_aabool(char *buffer, const struct kernel_param *kp)
John Johansenb5e95b42010-07-29 14:48:07 -0700791{
792 if (!capable(CAP_MAC_ADMIN))
793 return -EPERM;
794 return param_get_bool(buffer, kp);
795}
796
Stephen Rothwell101d6c82010-08-02 12:00:43 +1000797static int param_set_aauint(const char *val, const struct kernel_param *kp)
John Johansenb5e95b42010-07-29 14:48:07 -0700798{
799 if (!capable(CAP_MAC_ADMIN))
800 return -EPERM;
801 return param_set_uint(val, kp);
802}
803
Stephen Rothwell101d6c82010-08-02 12:00:43 +1000804static int param_get_aauint(char *buffer, const struct kernel_param *kp)
John Johansenb5e95b42010-07-29 14:48:07 -0700805{
806 if (!capable(CAP_MAC_ADMIN))
807 return -EPERM;
808 return param_get_uint(buffer, kp);
809}
810
811static int param_get_audit(char *buffer, struct kernel_param *kp)
812{
813 if (!capable(CAP_MAC_ADMIN))
814 return -EPERM;
815
816 if (!apparmor_enabled)
817 return -EINVAL;
818
819 return sprintf(buffer, "%s", audit_mode_names[aa_g_audit]);
820}
821
822static int param_set_audit(const char *val, struct kernel_param *kp)
823{
824 int i;
825 if (!capable(CAP_MAC_ADMIN))
826 return -EPERM;
827
828 if (!apparmor_enabled)
829 return -EINVAL;
830
831 if (!val)
832 return -EINVAL;
833
834 for (i = 0; i < AUDIT_MAX_INDEX; i++) {
835 if (strcmp(val, audit_mode_names[i]) == 0) {
836 aa_g_audit = i;
837 return 0;
838 }
839 }
840
841 return -EINVAL;
842}
843
844static int param_get_mode(char *buffer, struct kernel_param *kp)
845{
846 if (!capable(CAP_MAC_ADMIN))
847 return -EPERM;
848
849 if (!apparmor_enabled)
850 return -EINVAL;
851
852 return sprintf(buffer, "%s", profile_mode_names[aa_g_profile_mode]);
853}
854
855static int param_set_mode(const char *val, struct kernel_param *kp)
856{
857 int i;
858 if (!capable(CAP_MAC_ADMIN))
859 return -EPERM;
860
861 if (!apparmor_enabled)
862 return -EINVAL;
863
864 if (!val)
865 return -EINVAL;
866
867 for (i = 0; i < APPARMOR_NAMES_MAX_INDEX; i++) {
868 if (strcmp(val, profile_mode_names[i]) == 0) {
869 aa_g_profile_mode = i;
870 return 0;
871 }
872 }
873
874 return -EINVAL;
875}
876
877/*
878 * AppArmor init functions
879 */
880
881/**
882 * set_init_cxt - set a task context and profile on the first task.
883 *
884 * TODO: allow setting an alternate profile than unconfined
885 */
886static int __init set_init_cxt(void)
887{
888 struct cred *cred = (struct cred *)current->real_cred;
889 struct aa_task_cxt *cxt;
890
891 cxt = aa_alloc_task_context(GFP_KERNEL);
892 if (!cxt)
893 return -ENOMEM;
894
895 cxt->profile = aa_get_profile(root_ns->unconfined);
896 cred->security = cxt;
897
898 return 0;
899}
900
901static int __init apparmor_init(void)
902{
903 int error;
904
905 if (!apparmor_enabled || !security_module_enable(&apparmor_ops)) {
906 aa_info_message("AppArmor disabled by boot time parameter");
907 apparmor_enabled = 0;
908 return 0;
909 }
910
911 error = aa_alloc_root_ns();
912 if (error) {
913 AA_ERROR("Unable to allocate default profile namespace\n");
914 goto alloc_out;
915 }
916
917 error = set_init_cxt();
918 if (error) {
919 AA_ERROR("Failed to set context on init task\n");
920 goto register_security_out;
921 }
922
923 error = register_security(&apparmor_ops);
924 if (error) {
925 AA_ERROR("Unable to register AppArmor\n");
wzt.wzt@gmail.coma26d2792010-11-10 16:05:15 +0800926 goto set_init_cxt_out;
John Johansenb5e95b42010-07-29 14:48:07 -0700927 }
928
929 /* Report that AppArmor successfully initialized */
930 apparmor_initialized = 1;
931 if (aa_g_profile_mode == APPARMOR_COMPLAIN)
932 aa_info_message("AppArmor initialized: complain mode enabled");
933 else if (aa_g_profile_mode == APPARMOR_KILL)
934 aa_info_message("AppArmor initialized: kill mode enabled");
935 else
936 aa_info_message("AppArmor initialized");
937
938 return error;
939
wzt.wzt@gmail.coma26d2792010-11-10 16:05:15 +0800940set_init_cxt_out:
941 aa_free_task_context(current->real_cred->security);
942
John Johansenb5e95b42010-07-29 14:48:07 -0700943register_security_out:
944 aa_free_root_ns();
945
946alloc_out:
947 aa_destroy_aafs();
948
949 apparmor_enabled = 0;
950 return error;
John Johansenb5e95b42010-07-29 14:48:07 -0700951}
952
953security_initcall(apparmor_init);