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[firewire-audio.git] / security / apparmor / lsm.c
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1 /*
2 * AppArmor security module
4 * This file contains AppArmor LSM hooks.
6 * Copyright (C) 1998-2008 Novell/SUSE
7 * Copyright 2009-2010 Canonical Ltd.
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.
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>
25 #include <net/sock.h>
27 #include "include/apparmor.h"
28 #include "include/apparmorfs.h"
29 #include "include/audit.h"
30 #include "include/capability.h"
31 #include "include/context.h"
32 #include "include/file.h"
33 #include "include/ipc.h"
34 #include "include/path.h"
35 #include "include/policy.h"
36 #include "include/procattr.h"
38 /* Flag indicating whether initialization completed */
39 int apparmor_initialized __initdata;
42 * LSM hook functions
46 * free the associated aa_task_cxt and put its profiles
48 static void apparmor_cred_free(struct cred *cred)
50 aa_free_task_context(cred->security);
51 cred->security = NULL;
55 * allocate the apparmor part of blank credentials
57 static int apparmor_cred_alloc_blank(struct cred *cred, gfp_t gfp)
59 /* freed by apparmor_cred_free */
60 struct aa_task_cxt *cxt = aa_alloc_task_context(gfp);
61 if (!cxt)
62 return -ENOMEM;
64 cred->security = cxt;
65 return 0;
69 * prepare new aa_task_cxt for modification by prepare_cred block
71 static int apparmor_cred_prepare(struct cred *new, const struct cred *old,
72 gfp_t gfp)
74 /* freed by apparmor_cred_free */
75 struct aa_task_cxt *cxt = aa_alloc_task_context(gfp);
76 if (!cxt)
77 return -ENOMEM;
79 aa_dup_task_context(cxt, old->security);
80 new->security = cxt;
81 return 0;
85 * transfer the apparmor data to a blank set of creds
87 static void apparmor_cred_transfer(struct cred *new, const struct cred *old)
89 const struct aa_task_cxt *old_cxt = old->security;
90 struct aa_task_cxt *new_cxt = new->security;
92 aa_dup_task_context(new_cxt, old_cxt);
95 static int apparmor_ptrace_access_check(struct task_struct *child,
96 unsigned int mode)
98 int error = cap_ptrace_access_check(child, mode);
99 if (error)
100 return error;
102 return aa_ptrace(current, child, mode);
105 static int apparmor_ptrace_traceme(struct task_struct *parent)
107 int error = cap_ptrace_traceme(parent);
108 if (error)
109 return error;
111 return aa_ptrace(parent, current, PTRACE_MODE_ATTACH);
114 /* Derived from security/commoncap.c:cap_capget */
115 static int apparmor_capget(struct task_struct *target, kernel_cap_t *effective,
116 kernel_cap_t *inheritable, kernel_cap_t *permitted)
118 struct aa_profile *profile;
119 const struct cred *cred;
121 rcu_read_lock();
122 cred = __task_cred(target);
123 profile = aa_cred_profile(cred);
125 *effective = cred->cap_effective;
126 *inheritable = cred->cap_inheritable;
127 *permitted = cred->cap_permitted;
129 if (!unconfined(profile)) {
130 *effective = cap_intersect(*effective, profile->caps.allow);
131 *permitted = cap_intersect(*permitted, profile->caps.allow);
133 rcu_read_unlock();
135 return 0;
138 static int apparmor_capable(struct task_struct *task, const struct cred *cred,
139 int cap, int audit)
141 struct aa_profile *profile;
142 /* cap_capable returns 0 on success, else -EPERM */
143 int error = cap_capable(task, cred, cap, audit);
144 if (!error) {
145 profile = aa_cred_profile(cred);
146 if (!unconfined(profile))
147 error = aa_capable(task, profile, cap, audit);
149 return error;
153 * common_perm - basic common permission check wrapper fn for paths
154 * @op: operation being checked
155 * @path: path to check permission of (NOT NULL)
156 * @mask: requested permissions mask
157 * @cond: conditional info for the permission request (NOT NULL)
159 * Returns: %0 else error code if error or permission denied
161 static int common_perm(int op, struct path *path, u32 mask,
162 struct path_cond *cond)
164 struct aa_profile *profile;
165 int error = 0;
167 profile = __aa_current_profile();
168 if (!unconfined(profile))
169 error = aa_path_perm(op, profile, path, 0, mask, cond);
171 return error;
175 * common_perm_dir_dentry - common permission wrapper when path is dir, dentry
176 * @op: operation being checked
177 * @dir: directory of the dentry (NOT NULL)
178 * @dentry: dentry to check (NOT NULL)
179 * @mask: requested permissions mask
180 * @cond: conditional info for the permission request (NOT NULL)
182 * Returns: %0 else error code if error or permission denied
184 static int common_perm_dir_dentry(int op, struct path *dir,
185 struct dentry *dentry, u32 mask,
186 struct path_cond *cond)
188 struct path path = { dir->mnt, dentry };
190 return common_perm(op, &path, mask, cond);
194 * common_perm_mnt_dentry - common permission wrapper when mnt, dentry
195 * @op: operation being checked
196 * @mnt: mount point of dentry (NOT NULL)
197 * @dentry: dentry to check (NOT NULL)
198 * @mask: requested permissions mask
200 * Returns: %0 else error code if error or permission denied
202 static int common_perm_mnt_dentry(int op, struct vfsmount *mnt,
203 struct dentry *dentry, u32 mask)
205 struct path path = { mnt, dentry };
206 struct path_cond cond = { dentry->d_inode->i_uid,
207 dentry->d_inode->i_mode
210 return common_perm(op, &path, mask, &cond);
214 * common_perm_rm - common permission wrapper for operations doing rm
215 * @op: operation being checked
216 * @dir: directory that the dentry is in (NOT NULL)
217 * @dentry: dentry being rm'd (NOT NULL)
218 * @mask: requested permission mask
220 * Returns: %0 else error code if error or permission denied
222 static int common_perm_rm(int op, struct path *dir,
223 struct dentry *dentry, u32 mask)
225 struct inode *inode = dentry->d_inode;
226 struct path_cond cond = { };
228 if (!inode || !dir->mnt || !mediated_filesystem(inode))
229 return 0;
231 cond.uid = inode->i_uid;
232 cond.mode = inode->i_mode;
234 return common_perm_dir_dentry(op, dir, dentry, mask, &cond);
238 * common_perm_create - common permission wrapper for operations doing create
239 * @op: operation being checked
240 * @dir: directory that dentry will be created in (NOT NULL)
241 * @dentry: dentry to create (NOT NULL)
242 * @mask: request permission mask
243 * @mode: created file mode
245 * Returns: %0 else error code if error or permission denied
247 static int common_perm_create(int op, struct path *dir, struct dentry *dentry,
248 u32 mask, umode_t mode)
250 struct path_cond cond = { current_fsuid(), mode };
252 if (!dir->mnt || !mediated_filesystem(dir->dentry->d_inode))
253 return 0;
255 return common_perm_dir_dentry(op, dir, dentry, mask, &cond);
258 static int apparmor_path_unlink(struct path *dir, struct dentry *dentry)
260 return common_perm_rm(OP_UNLINK, dir, dentry, AA_MAY_DELETE);
263 static int apparmor_path_mkdir(struct path *dir, struct dentry *dentry,
264 int mode)
266 return common_perm_create(OP_MKDIR, dir, dentry, AA_MAY_CREATE,
267 S_IFDIR);
270 static int apparmor_path_rmdir(struct path *dir, struct dentry *dentry)
272 return common_perm_rm(OP_RMDIR, dir, dentry, AA_MAY_DELETE);
275 static int apparmor_path_mknod(struct path *dir, struct dentry *dentry,
276 int mode, unsigned int dev)
278 return common_perm_create(OP_MKNOD, dir, dentry, AA_MAY_CREATE, mode);
281 static int apparmor_path_truncate(struct path *path)
283 struct path_cond cond = { path->dentry->d_inode->i_uid,
284 path->dentry->d_inode->i_mode
287 if (!path->mnt || !mediated_filesystem(path->dentry->d_inode))
288 return 0;
290 return common_perm(OP_TRUNC, path, MAY_WRITE | AA_MAY_META_WRITE,
291 &cond);
294 static int apparmor_path_symlink(struct path *dir, struct dentry *dentry,
295 const char *old_name)
297 return common_perm_create(OP_SYMLINK, dir, dentry, AA_MAY_CREATE,
298 S_IFLNK);
301 static int apparmor_path_link(struct dentry *old_dentry, struct path *new_dir,
302 struct dentry *new_dentry)
304 struct aa_profile *profile;
305 int error = 0;
307 if (!mediated_filesystem(old_dentry->d_inode))
308 return 0;
310 profile = aa_current_profile();
311 if (!unconfined(profile))
312 error = aa_path_link(profile, old_dentry, new_dir, new_dentry);
313 return error;
316 static int apparmor_path_rename(struct path *old_dir, struct dentry *old_dentry,
317 struct path *new_dir, struct dentry *new_dentry)
319 struct aa_profile *profile;
320 int error = 0;
322 if (!mediated_filesystem(old_dentry->d_inode))
323 return 0;
325 profile = aa_current_profile();
326 if (!unconfined(profile)) {
327 struct path old_path = { old_dir->mnt, old_dentry };
328 struct path new_path = { new_dir->mnt, new_dentry };
329 struct path_cond cond = { old_dentry->d_inode->i_uid,
330 old_dentry->d_inode->i_mode
333 error = aa_path_perm(OP_RENAME_SRC, profile, &old_path, 0,
334 MAY_READ | AA_MAY_META_READ | MAY_WRITE |
335 AA_MAY_META_WRITE | AA_MAY_DELETE,
336 &cond);
337 if (!error)
338 error = aa_path_perm(OP_RENAME_DEST, profile, &new_path,
339 0, MAY_WRITE | AA_MAY_META_WRITE |
340 AA_MAY_CREATE, &cond);
343 return error;
346 static int apparmor_path_chmod(struct dentry *dentry, struct vfsmount *mnt,
347 mode_t mode)
349 if (!mediated_filesystem(dentry->d_inode))
350 return 0;
352 return common_perm_mnt_dentry(OP_CHMOD, mnt, dentry, AA_MAY_CHMOD);
355 static int apparmor_path_chown(struct path *path, uid_t uid, gid_t gid)
357 struct path_cond cond = { path->dentry->d_inode->i_uid,
358 path->dentry->d_inode->i_mode
361 if (!mediated_filesystem(path->dentry->d_inode))
362 return 0;
364 return common_perm(OP_CHOWN, path, AA_MAY_CHOWN, &cond);
367 static int apparmor_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
369 if (!mediated_filesystem(dentry->d_inode))
370 return 0;
372 return common_perm_mnt_dentry(OP_GETATTR, mnt, dentry,
373 AA_MAY_META_READ);
376 static int apparmor_dentry_open(struct file *file, const struct cred *cred)
378 struct aa_file_cxt *fcxt = file->f_security;
379 struct aa_profile *profile;
380 int error = 0;
382 if (!mediated_filesystem(file->f_path.dentry->d_inode))
383 return 0;
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.
390 if (current->in_execve) {
391 fcxt->allow = MAY_EXEC | MAY_READ | AA_EXEC_MMAP;
392 return 0;
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 };
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);
406 return error;
409 static int apparmor_file_alloc_security(struct file *file)
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;
419 static void apparmor_file_free_security(struct file *file)
421 struct aa_file_cxt *cxt = file->f_security;
423 aa_free_file_context(cxt);
426 static int common_file_perm(int op, struct file *file, u32 mask)
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;
432 BUG_ON(!fprofile);
434 if (!file->f_path.mnt ||
435 !mediated_filesystem(file->f_path.dentry->d_inode))
436 return 0;
438 profile = __aa_current_profile();
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.
444 * Note: the test for !unconfined(fprofile) is to handle file
445 * delegation from unconfined tasks
447 if (!unconfined(profile) && !unconfined(fprofile) &&
448 ((fprofile != profile) || (mask & ~fcxt->allow)))
449 error = aa_file_perm(op, profile, file, mask);
451 return error;
454 static int apparmor_file_permission(struct file *file, int mask)
456 return common_file_perm(OP_FPERM, file, mask);
459 static int apparmor_file_lock(struct file *file, unsigned int cmd)
461 u32 mask = AA_MAY_LOCK;
463 if (cmd == F_WRLCK)
464 mask |= MAY_WRITE;
466 return common_file_perm(OP_FLOCK, file, mask);
469 static int common_mmap(int op, struct file *file, unsigned long prot,
470 unsigned long flags)
472 struct dentry *dentry;
473 int mask = 0;
475 if (!file || !file->f_security)
476 return 0;
478 if (prot & PROT_READ)
479 mask |= MAY_READ;
481 * Private mappings don't require write perms since they don't
482 * write back to the files
484 if ((prot & PROT_WRITE) && !(flags & MAP_PRIVATE))
485 mask |= MAY_WRITE;
486 if (prot & PROT_EXEC)
487 mask |= AA_EXEC_MMAP;
489 dentry = file->f_path.dentry;
490 return common_file_perm(op, file, mask);
493 static 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)
497 int rc = 0;
499 /* do DAC check */
500 rc = cap_file_mmap(file, reqprot, prot, flags, addr, addr_only);
501 if (rc || addr_only)
502 return rc;
504 return common_mmap(OP_FMMAP, file, prot, flags);
507 static int apparmor_file_mprotect(struct vm_area_struct *vma,
508 unsigned long reqprot, unsigned long prot)
510 return common_mmap(OP_FMPROT, vma->vm_file, prot,
511 !(vma->vm_flags & VM_SHARED) ? MAP_PRIVATE : 0);
514 static int apparmor_getprocattr(struct task_struct *task, char *name,
515 char **value)
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);
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;
536 put_cred(cred);
538 return error;
541 static int apparmor_setprocattr(struct task_struct *task, char *name,
542 void *value, size_t size)
544 char *command, *args = value;
545 size_t arg_size;
546 int error;
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
554 if (args[size - 1] != '\0') {
555 if (size == PAGE_SIZE)
556 return -EINVAL;
557 args[size] = '\0';
560 /* task can only write its own attributes */
561 if (current != task)
562 return -EACCES;
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;
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;
591 COMMON_AUDIT_DATA_INIT(&sa, NONE);
592 sa.aad.op = OP_SETPROCATTR;
593 sa.aad.info = name;
594 sa.aad.error = -EINVAL;
595 return aa_audit(AUDIT_APPARMOR_DENIED, NULL, GFP_KERNEL,
596 &sa, NULL);
598 } else if (strcmp(name, "exec") == 0) {
599 error = aa_setprocattr_changeprofile(args, AA_ONEXEC,
600 !AA_DO_TEST);
601 } else {
602 /* only support the "current" and "exec" process attributes */
603 return -EINVAL;
605 if (!error)
606 error = size;
607 return error;
610 static int apparmor_task_setrlimit(struct task_struct *task,
611 unsigned int resource, struct rlimit *new_rlim)
613 struct aa_profile *profile = aa_current_profile();
614 int error = 0;
616 if (!unconfined(profile))
617 error = aa_task_setrlimit(profile, task, resource, new_rlim);
619 return error;
622 static struct security_operations apparmor_ops = {
623 .name = "apparmor",
625 .ptrace_access_check = apparmor_ptrace_access_check,
626 .ptrace_traceme = apparmor_ptrace_traceme,
627 .capget = apparmor_capget,
628 .capable = apparmor_capable,
630 .path_link = apparmor_path_link,
631 .path_unlink = apparmor_path_unlink,
632 .path_symlink = apparmor_path_symlink,
633 .path_mkdir = apparmor_path_mkdir,
634 .path_rmdir = apparmor_path_rmdir,
635 .path_mknod = apparmor_path_mknod,
636 .path_rename = apparmor_path_rename,
637 .path_chmod = apparmor_path_chmod,
638 .path_chown = apparmor_path_chown,
639 .path_truncate = apparmor_path_truncate,
640 .dentry_open = apparmor_dentry_open,
641 .inode_getattr = apparmor_inode_getattr,
643 .file_permission = apparmor_file_permission,
644 .file_alloc_security = apparmor_file_alloc_security,
645 .file_free_security = apparmor_file_free_security,
646 .file_mmap = apparmor_file_mmap,
647 .file_mprotect = apparmor_file_mprotect,
648 .file_lock = apparmor_file_lock,
650 .getprocattr = apparmor_getprocattr,
651 .setprocattr = apparmor_setprocattr,
653 .cred_alloc_blank = apparmor_cred_alloc_blank,
654 .cred_free = apparmor_cred_free,
655 .cred_prepare = apparmor_cred_prepare,
656 .cred_transfer = apparmor_cred_transfer,
658 .bprm_set_creds = apparmor_bprm_set_creds,
659 .bprm_committing_creds = apparmor_bprm_committing_creds,
660 .bprm_committed_creds = apparmor_bprm_committed_creds,
661 .bprm_secureexec = apparmor_bprm_secureexec,
663 .task_setrlimit = apparmor_task_setrlimit,
667 * AppArmor sysfs module parameters
670 static int param_set_aabool(const char *val, const struct kernel_param *kp);
671 static int param_get_aabool(char *buffer, const struct kernel_param *kp);
672 #define param_check_aabool(name, p) __param_check(name, p, int)
673 static struct kernel_param_ops param_ops_aabool = {
674 .set = param_set_aabool,
675 .get = param_get_aabool
678 static int param_set_aauint(const char *val, const struct kernel_param *kp);
679 static int param_get_aauint(char *buffer, const struct kernel_param *kp);
680 #define param_check_aauint(name, p) __param_check(name, p, int)
681 static struct kernel_param_ops param_ops_aauint = {
682 .set = param_set_aauint,
683 .get = param_get_aauint
686 static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp);
687 static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp);
688 #define param_check_aalockpolicy(name, p) __param_check(name, p, int)
689 static struct kernel_param_ops param_ops_aalockpolicy = {
690 .set = param_set_aalockpolicy,
691 .get = param_get_aalockpolicy
694 static int param_set_audit(const char *val, struct kernel_param *kp);
695 static int param_get_audit(char *buffer, struct kernel_param *kp);
696 #define param_check_audit(name, p) __param_check(name, p, int)
698 static int param_set_mode(const char *val, struct kernel_param *kp);
699 static int param_get_mode(char *buffer, struct kernel_param *kp);
700 #define param_check_mode(name, p) __param_check(name, p, int)
702 /* Flag values, also controllable via /sys/module/apparmor/parameters
703 * We define special types as we want to do additional mediation.
706 /* AppArmor global enforcement switch - complain, enforce, kill */
707 enum profile_mode aa_g_profile_mode = APPARMOR_ENFORCE;
708 module_param_call(mode, param_set_mode, param_get_mode,
709 &aa_g_profile_mode, S_IRUSR | S_IWUSR);
711 /* Debug mode */
712 int aa_g_debug;
713 module_param_named(debug, aa_g_debug, aabool, S_IRUSR | S_IWUSR);
715 /* Audit mode */
716 enum audit_mode aa_g_audit;
717 module_param_call(audit, param_set_audit, param_get_audit,
718 &aa_g_audit, S_IRUSR | S_IWUSR);
720 /* Determines if audit header is included in audited messages. This
721 * provides more context if the audit daemon is not running
723 int aa_g_audit_header = 1;
724 module_param_named(audit_header, aa_g_audit_header, aabool,
725 S_IRUSR | S_IWUSR);
727 /* lock out loading/removal of policy
728 * TODO: add in at boot loading of policy, which is the only way to
729 * load policy, if lock_policy is set
731 int aa_g_lock_policy;
732 module_param_named(lock_policy, aa_g_lock_policy, aalockpolicy,
733 S_IRUSR | S_IWUSR);
735 /* Syscall logging mode */
736 int aa_g_logsyscall;
737 module_param_named(logsyscall, aa_g_logsyscall, aabool, S_IRUSR | S_IWUSR);
739 /* Maximum pathname length before accesses will start getting rejected */
740 unsigned int aa_g_path_max = 2 * PATH_MAX;
741 module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR | S_IWUSR);
743 /* Determines how paranoid loading of policy is and how much verification
744 * on the loaded policy is done.
746 int aa_g_paranoid_load = 1;
747 module_param_named(paranoid_load, aa_g_paranoid_load, aabool,
748 S_IRUSR | S_IWUSR);
750 /* Boot time disable flag */
751 static unsigned int apparmor_enabled = CONFIG_SECURITY_APPARMOR_BOOTPARAM_VALUE;
752 module_param_named(enabled, apparmor_enabled, aabool, S_IRUSR);
754 static int __init apparmor_enabled_setup(char *str)
756 unsigned long enabled;
757 int error = strict_strtoul(str, 0, &enabled);
758 if (!error)
759 apparmor_enabled = enabled ? 1 : 0;
760 return 1;
763 __setup("apparmor=", apparmor_enabled_setup);
765 /* set global flag turning off the ability to load policy */
766 static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp)
768 if (!capable(CAP_MAC_ADMIN))
769 return -EPERM;
770 if (aa_g_lock_policy)
771 return -EACCES;
772 return param_set_bool(val, kp);
775 static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp)
777 if (!capable(CAP_MAC_ADMIN))
778 return -EPERM;
779 return param_get_bool(buffer, kp);
782 static int param_set_aabool(const char *val, const struct kernel_param *kp)
784 if (!capable(CAP_MAC_ADMIN))
785 return -EPERM;
786 return param_set_bool(val, kp);
789 static int param_get_aabool(char *buffer, const struct kernel_param *kp)
791 if (!capable(CAP_MAC_ADMIN))
792 return -EPERM;
793 return param_get_bool(buffer, kp);
796 static int param_set_aauint(const char *val, const struct kernel_param *kp)
798 if (!capable(CAP_MAC_ADMIN))
799 return -EPERM;
800 return param_set_uint(val, kp);
803 static int param_get_aauint(char *buffer, const struct kernel_param *kp)
805 if (!capable(CAP_MAC_ADMIN))
806 return -EPERM;
807 return param_get_uint(buffer, kp);
810 static int param_get_audit(char *buffer, struct kernel_param *kp)
812 if (!capable(CAP_MAC_ADMIN))
813 return -EPERM;
815 if (!apparmor_enabled)
816 return -EINVAL;
818 return sprintf(buffer, "%s", audit_mode_names[aa_g_audit]);
821 static int param_set_audit(const char *val, struct kernel_param *kp)
823 int i;
824 if (!capable(CAP_MAC_ADMIN))
825 return -EPERM;
827 if (!apparmor_enabled)
828 return -EINVAL;
830 if (!val)
831 return -EINVAL;
833 for (i = 0; i < AUDIT_MAX_INDEX; i++) {
834 if (strcmp(val, audit_mode_names[i]) == 0) {
835 aa_g_audit = i;
836 return 0;
840 return -EINVAL;
843 static int param_get_mode(char *buffer, struct kernel_param *kp)
845 if (!capable(CAP_MAC_ADMIN))
846 return -EPERM;
848 if (!apparmor_enabled)
849 return -EINVAL;
851 return sprintf(buffer, "%s", profile_mode_names[aa_g_profile_mode]);
854 static int param_set_mode(const char *val, struct kernel_param *kp)
856 int i;
857 if (!capable(CAP_MAC_ADMIN))
858 return -EPERM;
860 if (!apparmor_enabled)
861 return -EINVAL;
863 if (!val)
864 return -EINVAL;
866 for (i = 0; i < APPARMOR_NAMES_MAX_INDEX; i++) {
867 if (strcmp(val, profile_mode_names[i]) == 0) {
868 aa_g_profile_mode = i;
869 return 0;
873 return -EINVAL;
877 * AppArmor init functions
881 * set_init_cxt - set a task context and profile on the first task.
883 * TODO: allow setting an alternate profile than unconfined
885 static int __init set_init_cxt(void)
887 struct cred *cred = (struct cred *)current->real_cred;
888 struct aa_task_cxt *cxt;
890 cxt = aa_alloc_task_context(GFP_KERNEL);
891 if (!cxt)
892 return -ENOMEM;
894 cxt->profile = aa_get_profile(root_ns->unconfined);
895 cred->security = cxt;
897 return 0;
900 static int __init apparmor_init(void)
902 int error;
904 if (!apparmor_enabled || !security_module_enable(&apparmor_ops)) {
905 aa_info_message("AppArmor disabled by boot time parameter");
906 apparmor_enabled = 0;
907 return 0;
910 error = aa_alloc_root_ns();
911 if (error) {
912 AA_ERROR("Unable to allocate default profile namespace\n");
913 goto alloc_out;
916 error = set_init_cxt();
917 if (error) {
918 AA_ERROR("Failed to set context on init task\n");
919 goto register_security_out;
922 error = register_security(&apparmor_ops);
923 if (error) {
924 AA_ERROR("Unable to register AppArmor\n");
925 goto set_init_cxt_out;
928 /* Report that AppArmor successfully initialized */
929 apparmor_initialized = 1;
930 if (aa_g_profile_mode == APPARMOR_COMPLAIN)
931 aa_info_message("AppArmor initialized: complain mode enabled");
932 else if (aa_g_profile_mode == APPARMOR_KILL)
933 aa_info_message("AppArmor initialized: kill mode enabled");
934 else
935 aa_info_message("AppArmor initialized");
937 return error;
939 set_init_cxt_out:
940 aa_free_task_context(current->real_cred->security);
942 register_security_out:
943 aa_free_root_ns();
945 alloc_out:
946 aa_destroy_aafs();
948 apparmor_enabled = 0;
949 return error;
952 security_initcall(apparmor_init);