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
15 #include <linux/security.h>
16 #include <linux/moduleparam.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 <linux/user_namespace.h>
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/net.h"
36 #include "include/path.h"
37 #include "include/policy.h"
38 #include "include/procattr.h"
40 /* Flag indicating whether initialization completed */
41 int apparmor_initialized __initdata;
48 * free the associated aa_task_cxt and put its profiles
50 static void apparmor_cred_free(struct cred *cred)
52 aa_free_task_context(cred->security);
53 cred->security = NULL;
57 * allocate the apparmor part of blank credentials
59 static int apparmor_cred_alloc_blank(struct cred *cred, gfp_t gfp)
61 /* freed by apparmor_cred_free */
62 struct aa_task_cxt *cxt = aa_alloc_task_context(gfp);
71 * prepare new aa_task_cxt for modification by prepare_cred block
73 static int apparmor_cred_prepare(struct cred *new, const struct cred *old,
76 /* freed by apparmor_cred_free */
77 struct aa_task_cxt *cxt = aa_alloc_task_context(gfp);
81 aa_dup_task_context(cxt, old->security);
87 * transfer the apparmor data to a blank set of creds
89 static void apparmor_cred_transfer(struct cred *new, const struct cred *old)
91 const struct aa_task_cxt *old_cxt = old->security;
92 struct aa_task_cxt *new_cxt = new->security;
94 aa_dup_task_context(new_cxt, old_cxt);
97 static int apparmor_ptrace_access_check(struct task_struct *child,
100 int error = cap_ptrace_access_check(child, mode);
104 return aa_ptrace(current, child, mode);
107 static int apparmor_ptrace_traceme(struct task_struct *parent)
109 int error = cap_ptrace_traceme(parent);
113 return aa_ptrace(parent, current, PTRACE_MODE_ATTACH);
116 /* Derived from security/commoncap.c:cap_capget */
117 static int apparmor_capget(struct task_struct *target, kernel_cap_t *effective,
118 kernel_cap_t *inheritable, kernel_cap_t *permitted)
120 struct aa_profile *profile;
121 const struct cred *cred;
124 cred = __task_cred(target);
125 profile = aa_cred_profile(cred);
127 *effective = cred->cap_effective;
128 *inheritable = cred->cap_inheritable;
129 *permitted = cred->cap_permitted;
131 if (!unconfined(profile) && !COMPLAIN_MODE(profile)) {
132 *effective = cap_intersect(*effective, profile->caps.allow);
133 *permitted = cap_intersect(*permitted, profile->caps.allow);
140 static int apparmor_capable(const struct cred *cred, struct user_namespace *ns,
143 struct aa_profile *profile;
144 /* cap_capable returns 0 on success, else -EPERM */
145 int error = cap_capable(cred, ns, cap, audit);
147 profile = aa_cred_profile(cred);
148 if (!unconfined(profile))
149 error = aa_capable(current, profile, cap, audit);
155 * common_perm - basic common permission check wrapper fn for paths
156 * @op: operation being checked
157 * @path: path to check permission of (NOT NULL)
158 * @mask: requested permissions mask
159 * @cond: conditional info for the permission request (NOT NULL)
161 * Returns: %0 else error code if error or permission denied
163 static int common_perm(int op, struct path *path, u32 mask,
164 struct path_cond *cond)
166 struct aa_profile *profile;
169 profile = __aa_current_profile();
170 if (!unconfined(profile))
171 error = aa_path_perm(op, profile, path, 0, mask, cond);
177 * common_perm_dir_dentry - common permission wrapper when path is dir, dentry
178 * @op: operation being checked
179 * @dir: directory of the dentry (NOT NULL)
180 * @dentry: dentry to check (NOT NULL)
181 * @mask: requested permissions mask
182 * @cond: conditional info for the permission request (NOT NULL)
184 * Returns: %0 else error code if error or permission denied
186 static int common_perm_dir_dentry(int op, struct path *dir,
187 struct dentry *dentry, u32 mask,
188 struct path_cond *cond)
190 struct path path = { dir->mnt, dentry };
192 return common_perm(op, &path, mask, cond);
196 * common_perm_mnt_dentry - common permission wrapper when mnt, dentry
197 * @op: operation being checked
198 * @mnt: mount point of dentry (NOT NULL)
199 * @dentry: dentry to check (NOT NULL)
200 * @mask: requested permissions mask
202 * Returns: %0 else error code if error or permission denied
204 static int common_perm_mnt_dentry(int op, struct vfsmount *mnt,
205 struct dentry *dentry, u32 mask)
207 struct path path = { mnt, dentry };
208 struct path_cond cond = { dentry->d_inode->i_uid,
209 dentry->d_inode->i_mode
212 return common_perm(op, &path, mask, &cond);
216 * common_perm_rm - common permission wrapper for operations doing rm
217 * @op: operation being checked
218 * @dir: directory that the dentry is in (NOT NULL)
219 * @dentry: dentry being rm'd (NOT NULL)
220 * @mask: requested permission mask
222 * Returns: %0 else error code if error or permission denied
224 static int common_perm_rm(int op, struct path *dir,
225 struct dentry *dentry, u32 mask)
227 struct inode *inode = dentry->d_inode;
228 struct path_cond cond = { };
230 if (!inode || !dir->mnt || !mediated_filesystem(inode))
233 cond.uid = inode->i_uid;
234 cond.mode = inode->i_mode;
236 return common_perm_dir_dentry(op, dir, dentry, mask, &cond);
240 * common_perm_create - common permission wrapper for operations doing create
241 * @op: operation being checked
242 * @dir: directory that dentry will be created in (NOT NULL)
243 * @dentry: dentry to create (NOT NULL)
244 * @mask: request permission mask
245 * @mode: created file mode
247 * Returns: %0 else error code if error or permission denied
249 static int common_perm_create(int op, struct path *dir, struct dentry *dentry,
250 u32 mask, umode_t mode)
252 struct path_cond cond = { current_fsuid(), mode };
254 if (!dir->mnt || !mediated_filesystem(dir->dentry->d_inode))
257 return common_perm_dir_dentry(op, dir, dentry, mask, &cond);
260 static int apparmor_path_unlink(struct path *dir, struct dentry *dentry)
262 return common_perm_rm(OP_UNLINK, dir, dentry, AA_MAY_DELETE);
265 static int apparmor_path_mkdir(struct path *dir, struct dentry *dentry,
268 return common_perm_create(OP_MKDIR, dir, dentry, AA_MAY_CREATE,
272 static int apparmor_path_rmdir(struct path *dir, struct dentry *dentry)
274 return common_perm_rm(OP_RMDIR, dir, dentry, AA_MAY_DELETE);
277 static int apparmor_path_mknod(struct path *dir, struct dentry *dentry,
278 umode_t mode, unsigned int dev)
280 return common_perm_create(OP_MKNOD, dir, dentry, AA_MAY_CREATE, mode);
283 static int apparmor_path_truncate(struct path *path)
285 struct path_cond cond = { path->dentry->d_inode->i_uid,
286 path->dentry->d_inode->i_mode
289 if (!path->mnt || !mediated_filesystem(path->dentry->d_inode))
292 return common_perm(OP_TRUNC, path, MAY_WRITE | AA_MAY_META_WRITE,
296 static int apparmor_path_symlink(struct path *dir, struct dentry *dentry,
297 const char *old_name)
299 return common_perm_create(OP_SYMLINK, dir, dentry, AA_MAY_CREATE,
303 static int apparmor_path_link(struct dentry *old_dentry, struct path *new_dir,
304 struct dentry *new_dentry)
306 struct aa_profile *profile;
309 if (!mediated_filesystem(old_dentry->d_inode))
312 profile = aa_current_profile();
313 if (!unconfined(profile))
314 error = aa_path_link(profile, old_dentry, new_dir, new_dentry);
318 static int apparmor_path_rename(struct path *old_dir, struct dentry *old_dentry,
319 struct path *new_dir, struct dentry *new_dentry)
321 struct aa_profile *profile;
324 if (!mediated_filesystem(old_dentry->d_inode))
327 profile = aa_current_profile();
328 if (!unconfined(profile)) {
329 struct path old_path = { old_dir->mnt, old_dentry };
330 struct path new_path = { new_dir->mnt, new_dentry };
331 struct path_cond cond = { old_dentry->d_inode->i_uid,
332 old_dentry->d_inode->i_mode
335 error = aa_path_perm(OP_RENAME_SRC, profile, &old_path, 0,
336 MAY_READ | AA_MAY_META_READ | MAY_WRITE |
337 AA_MAY_META_WRITE | AA_MAY_DELETE,
340 error = aa_path_perm(OP_RENAME_DEST, profile, &new_path,
341 0, MAY_WRITE | AA_MAY_META_WRITE |
342 AA_MAY_CREATE, &cond);
348 static int apparmor_path_chmod(struct path *path, umode_t mode)
350 if (!mediated_filesystem(path->dentry->d_inode))
353 return common_perm_mnt_dentry(OP_CHMOD, path->mnt, path->dentry, AA_MAY_CHMOD);
356 static int apparmor_path_chown(struct path *path, uid_t uid, gid_t gid)
358 struct path_cond cond = { path->dentry->d_inode->i_uid,
359 path->dentry->d_inode->i_mode
362 if (!mediated_filesystem(path->dentry->d_inode))
365 return common_perm(OP_CHOWN, path, AA_MAY_CHOWN, &cond);
368 static int apparmor_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
370 if (!mediated_filesystem(dentry->d_inode))
373 return common_perm_mnt_dentry(OP_GETATTR, mnt, dentry,
377 static int apparmor_dentry_open(struct file *file, const struct cred *cred)
379 struct aa_file_cxt *fcxt = file->f_security;
380 struct aa_profile *profile;
383 if (!mediated_filesystem(file->f_path.dentry->d_inode))
386 /* If in exec, permission is handled by bprm hooks.
387 * Cache permissions granted by the previous exec check, with
388 * implicit read and executable mmap which are required to
389 * actually execute the image.
391 if (current->in_execve) {
392 fcxt->allow = MAY_EXEC | MAY_READ | AA_EXEC_MMAP;
396 profile = aa_cred_profile(cred);
397 if (!unconfined(profile)) {
398 struct inode *inode = file->f_path.dentry->d_inode;
399 struct path_cond cond = { inode->i_uid, inode->i_mode };
401 error = aa_path_perm(OP_OPEN, profile, &file->f_path, 0,
402 aa_map_file_to_perms(file), &cond);
403 /* todo cache full allowed permissions set and state */
404 fcxt->allow = aa_map_file_to_perms(file);
410 static int apparmor_file_alloc_security(struct file *file)
412 /* freed by apparmor_file_free_security */
413 file->f_security = aa_alloc_file_context(GFP_KERNEL);
414 if (!file->f_security)
420 static void apparmor_file_free_security(struct file *file)
422 struct aa_file_cxt *cxt = file->f_security;
424 aa_free_file_context(cxt);
427 static int common_file_perm(int op, struct file *file, u32 mask)
429 struct aa_file_cxt *fcxt = file->f_security;
430 struct aa_profile *profile, *fprofile = aa_cred_profile(file->f_cred);
435 if (!file->f_path.mnt ||
436 !mediated_filesystem(file->f_path.dentry->d_inode))
439 profile = __aa_current_profile();
441 /* revalidate access, if task is unconfined, or the cached cred
442 * doesn't match or if the request is for more permissions than
445 * Note: the test for !unconfined(fprofile) is to handle file
446 * delegation from unconfined tasks
448 if (!unconfined(profile) && !unconfined(fprofile) &&
449 ((fprofile != profile) || (mask & ~fcxt->allow)))
450 error = aa_file_perm(op, profile, file, mask);
455 static int apparmor_file_permission(struct file *file, int mask)
457 return common_file_perm(OP_FPERM, file, mask);
460 static int apparmor_file_lock(struct file *file, unsigned int cmd)
462 u32 mask = AA_MAY_LOCK;
467 return common_file_perm(OP_FLOCK, file, mask);
470 static int common_mmap(int op, struct file *file, unsigned long prot,
473 struct dentry *dentry;
476 if (!file || !file->f_security)
479 if (prot & PROT_READ)
482 * Private mappings don't require write perms since they don't
483 * write back to the files
485 if ((prot & PROT_WRITE) && !(flags & MAP_PRIVATE))
487 if (prot & PROT_EXEC)
488 mask |= AA_EXEC_MMAP;
490 dentry = file->f_path.dentry;
491 return common_file_perm(op, file, mask);
494 static int apparmor_file_mmap(struct file *file, unsigned long reqprot,
495 unsigned long prot, unsigned long flags,
496 unsigned long addr, unsigned long addr_only)
501 rc = cap_file_mmap(file, reqprot, prot, flags, addr, addr_only);
505 return common_mmap(OP_FMMAP, file, prot, flags);
508 static int apparmor_file_mprotect(struct vm_area_struct *vma,
509 unsigned long reqprot, unsigned long prot)
511 return common_mmap(OP_FMPROT, vma->vm_file, prot,
512 !(vma->vm_flags & VM_SHARED) ? MAP_PRIVATE : 0);
515 static int apparmor_getprocattr(struct task_struct *task, char *name,
519 struct aa_profile *profile;
521 const struct cred *cred = get_task_cred(task);
522 struct aa_task_cxt *cxt = cred->security;
523 profile = aa_cred_profile(cred);
525 if (strcmp(name, "current") == 0)
526 error = aa_getprocattr(aa_newest_version(cxt->profile),
528 else if (strcmp(name, "prev") == 0 && cxt->previous)
529 error = aa_getprocattr(aa_newest_version(cxt->previous),
531 else if (strcmp(name, "exec") == 0 && cxt->onexec)
532 error = aa_getprocattr(aa_newest_version(cxt->onexec),
542 static int apparmor_setprocattr(struct task_struct *task, char *name,
543 void *value, size_t size)
545 char *command, *args = value;
551 /* args points to a PAGE_SIZE buffer, AppArmor requires that
552 * the buffer must be null terminated or have size <= PAGE_SIZE -1
553 * so that AppArmor can null terminate them
555 if (args[size - 1] != '\0') {
556 if (size == PAGE_SIZE)
561 /* task can only write its own attributes */
567 command = strsep(&args, " ");
570 args = skip_spaces(args);
574 arg_size = size - (args - (char *) value);
575 if (strcmp(name, "current") == 0) {
576 if (strcmp(command, "changehat") == 0) {
577 error = aa_setprocattr_changehat(args, arg_size,
579 } else if (strcmp(command, "permhat") == 0) {
580 error = aa_setprocattr_changehat(args, arg_size,
582 } else if (strcmp(command, "changeprofile") == 0) {
583 error = aa_setprocattr_changeprofile(args, !AA_ONEXEC,
585 } else if (strcmp(command, "permprofile") == 0) {
586 error = aa_setprocattr_changeprofile(args, !AA_ONEXEC,
588 } else if (strcmp(command, "permipc") == 0) {
589 error = aa_setprocattr_permipc(args);
591 struct common_audit_data sa;
592 COMMON_AUDIT_DATA_INIT(&sa, NONE);
593 sa.aad.op = OP_SETPROCATTR;
595 sa.aad.error = -EINVAL;
596 return aa_audit(AUDIT_APPARMOR_DENIED,
597 __aa_current_profile(), GFP_KERNEL,
600 } else if (strcmp(name, "exec") == 0) {
601 error = aa_setprocattr_changeprofile(args, AA_ONEXEC,
604 /* only support the "current" and "exec" process attributes */
612 static int apparmor_task_setrlimit(struct task_struct *task,
613 unsigned int resource, struct rlimit *new_rlim)
615 struct aa_profile *profile = __aa_current_profile();
618 if (!unconfined(profile))
619 error = aa_task_setrlimit(profile, task, resource, new_rlim);
624 static int apparmor_socket_create(int family, int type, int protocol, int kern)
626 struct aa_profile *profile;
632 profile = __aa_current_profile();
633 if (!unconfined(profile))
634 error = aa_net_perm(OP_CREATE, profile, family, type, protocol,
639 static int apparmor_socket_bind(struct socket *sock,
640 struct sockaddr *address, int addrlen)
642 struct sock *sk = sock->sk;
644 return aa_revalidate_sk(OP_BIND, sk);
647 static int apparmor_socket_connect(struct socket *sock,
648 struct sockaddr *address, int addrlen)
650 struct sock *sk = sock->sk;
652 return aa_revalidate_sk(OP_CONNECT, sk);
655 static int apparmor_socket_listen(struct socket *sock, int backlog)
657 struct sock *sk = sock->sk;
659 return aa_revalidate_sk(OP_LISTEN, sk);
662 static int apparmor_socket_accept(struct socket *sock, struct socket *newsock)
664 struct sock *sk = sock->sk;
666 return aa_revalidate_sk(OP_ACCEPT, sk);
669 static int apparmor_socket_sendmsg(struct socket *sock,
670 struct msghdr *msg, int size)
672 struct sock *sk = sock->sk;
674 return aa_revalidate_sk(OP_SENDMSG, sk);
677 static int apparmor_socket_recvmsg(struct socket *sock,
678 struct msghdr *msg, int size, int flags)
680 struct sock *sk = sock->sk;
682 return aa_revalidate_sk(OP_RECVMSG, sk);
685 static int apparmor_socket_getsockname(struct socket *sock)
687 struct sock *sk = sock->sk;
689 return aa_revalidate_sk(OP_GETSOCKNAME, sk);
692 static int apparmor_socket_getpeername(struct socket *sock)
694 struct sock *sk = sock->sk;
696 return aa_revalidate_sk(OP_GETPEERNAME, sk);
699 static int apparmor_socket_getsockopt(struct socket *sock, int level,
702 struct sock *sk = sock->sk;
704 return aa_revalidate_sk(OP_GETSOCKOPT, sk);
707 static int apparmor_socket_setsockopt(struct socket *sock, int level,
710 struct sock *sk = sock->sk;
712 return aa_revalidate_sk(OP_SETSOCKOPT, sk);
715 static int apparmor_socket_shutdown(struct socket *sock, int how)
717 struct sock *sk = sock->sk;
719 return aa_revalidate_sk(OP_SOCK_SHUTDOWN, sk);
722 static struct security_operations apparmor_ops = {
725 .ptrace_access_check = apparmor_ptrace_access_check,
726 .ptrace_traceme = apparmor_ptrace_traceme,
727 .capget = apparmor_capget,
728 .capable = apparmor_capable,
730 .path_link = apparmor_path_link,
731 .path_unlink = apparmor_path_unlink,
732 .path_symlink = apparmor_path_symlink,
733 .path_mkdir = apparmor_path_mkdir,
734 .path_rmdir = apparmor_path_rmdir,
735 .path_mknod = apparmor_path_mknod,
736 .path_rename = apparmor_path_rename,
737 .path_chmod = apparmor_path_chmod,
738 .path_chown = apparmor_path_chown,
739 .path_truncate = apparmor_path_truncate,
740 .dentry_open = apparmor_dentry_open,
741 .inode_getattr = apparmor_inode_getattr,
743 .file_permission = apparmor_file_permission,
744 .file_alloc_security = apparmor_file_alloc_security,
745 .file_free_security = apparmor_file_free_security,
746 .file_mmap = apparmor_file_mmap,
747 .file_mprotect = apparmor_file_mprotect,
748 .file_lock = apparmor_file_lock,
750 .getprocattr = apparmor_getprocattr,
751 .setprocattr = apparmor_setprocattr,
753 .socket_create = apparmor_socket_create,
754 .socket_bind = apparmor_socket_bind,
755 .socket_connect = apparmor_socket_connect,
756 .socket_listen = apparmor_socket_listen,
757 .socket_accept = apparmor_socket_accept,
758 .socket_sendmsg = apparmor_socket_sendmsg,
759 .socket_recvmsg = apparmor_socket_recvmsg,
760 .socket_getsockname = apparmor_socket_getsockname,
761 .socket_getpeername = apparmor_socket_getpeername,
762 .socket_getsockopt = apparmor_socket_getsockopt,
763 .socket_setsockopt = apparmor_socket_setsockopt,
764 .socket_shutdown = apparmor_socket_shutdown,
766 .cred_alloc_blank = apparmor_cred_alloc_blank,
767 .cred_free = apparmor_cred_free,
768 .cred_prepare = apparmor_cred_prepare,
769 .cred_transfer = apparmor_cred_transfer,
771 .bprm_set_creds = apparmor_bprm_set_creds,
772 .bprm_committing_creds = apparmor_bprm_committing_creds,
773 .bprm_committed_creds = apparmor_bprm_committed_creds,
774 .bprm_secureexec = apparmor_bprm_secureexec,
776 .task_setrlimit = apparmor_task_setrlimit,
780 * AppArmor sysfs module parameters
783 static int param_set_aabool(const char *val, const struct kernel_param *kp);
784 static int param_get_aabool(char *buffer, const struct kernel_param *kp);
785 #define param_check_aabool param_check_bool
786 static struct kernel_param_ops param_ops_aabool = {
787 .set = param_set_aabool,
788 .get = param_get_aabool
791 static int param_set_aauint(const char *val, const struct kernel_param *kp);
792 static int param_get_aauint(char *buffer, const struct kernel_param *kp);
793 #define param_check_aauint param_check_uint
794 static struct kernel_param_ops param_ops_aauint = {
795 .set = param_set_aauint,
796 .get = param_get_aauint
799 static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp);
800 static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp);
801 #define param_check_aalockpolicy param_check_bool
802 static struct kernel_param_ops param_ops_aalockpolicy = {
803 .set = param_set_aalockpolicy,
804 .get = param_get_aalockpolicy
807 static int param_set_audit(const char *val, struct kernel_param *kp);
808 static int param_get_audit(char *buffer, struct kernel_param *kp);
810 static int param_set_mode(const char *val, struct kernel_param *kp);
811 static int param_get_mode(char *buffer, struct kernel_param *kp);
813 /* Flag values, also controllable via /sys/module/apparmor/parameters
814 * We define special types as we want to do additional mediation.
817 /* AppArmor global enforcement switch - complain, enforce, kill */
818 enum profile_mode aa_g_profile_mode = APPARMOR_ENFORCE;
819 module_param_call(mode, param_set_mode, param_get_mode,
820 &aa_g_profile_mode, S_IRUSR | S_IWUSR);
824 module_param_named(debug, aa_g_debug, aabool, S_IRUSR | S_IWUSR);
827 enum audit_mode aa_g_audit;
828 module_param_call(audit, param_set_audit, param_get_audit,
829 &aa_g_audit, S_IRUSR | S_IWUSR);
831 /* Determines if audit header is included in audited messages. This
832 * provides more context if the audit daemon is not running
834 bool aa_g_audit_header = 1;
835 module_param_named(audit_header, aa_g_audit_header, aabool,
838 /* lock out loading/removal of policy
839 * TODO: add in at boot loading of policy, which is the only way to
840 * load policy, if lock_policy is set
842 bool aa_g_lock_policy;
843 module_param_named(lock_policy, aa_g_lock_policy, aalockpolicy,
846 /* Syscall logging mode */
847 bool aa_g_logsyscall;
848 module_param_named(logsyscall, aa_g_logsyscall, aabool, S_IRUSR | S_IWUSR);
850 /* Maximum pathname length before accesses will start getting rejected */
851 unsigned int aa_g_path_max = 2 * PATH_MAX;
852 module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR | S_IWUSR);
854 /* Determines how paranoid loading of policy is and how much verification
855 * on the loaded policy is done.
857 bool aa_g_paranoid_load = 1;
858 module_param_named(paranoid_load, aa_g_paranoid_load, aabool,
861 /* Boot time disable flag */
862 static bool apparmor_enabled = CONFIG_SECURITY_APPARMOR_BOOTPARAM_VALUE;
863 module_param_named(enabled, apparmor_enabled, aabool, S_IRUSR);
865 static int __init apparmor_enabled_setup(char *str)
867 unsigned long enabled;
868 int error = strict_strtoul(str, 0, &enabled);
870 apparmor_enabled = enabled ? 1 : 0;
874 __setup("apparmor=", apparmor_enabled_setup);
876 /* set global flag turning off the ability to load policy */
877 static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp)
879 if (!capable(CAP_MAC_ADMIN))
881 if (aa_g_lock_policy)
883 return param_set_bool(val, kp);
886 static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp)
888 if (!capable(CAP_MAC_ADMIN))
890 return param_get_bool(buffer, kp);
893 static int param_set_aabool(const char *val, const struct kernel_param *kp)
895 if (!capable(CAP_MAC_ADMIN))
897 return param_set_bool(val, kp);
900 static int param_get_aabool(char *buffer, const struct kernel_param *kp)
902 if (!capable(CAP_MAC_ADMIN))
904 return param_get_bool(buffer, kp);
907 static int param_set_aauint(const char *val, const struct kernel_param *kp)
909 if (!capable(CAP_MAC_ADMIN))
911 return param_set_uint(val, kp);
914 static int param_get_aauint(char *buffer, const struct kernel_param *kp)
916 if (!capable(CAP_MAC_ADMIN))
918 return param_get_uint(buffer, kp);
921 static int param_get_audit(char *buffer, struct kernel_param *kp)
923 if (!capable(CAP_MAC_ADMIN))
926 if (!apparmor_enabled)
929 return sprintf(buffer, "%s", audit_mode_names[aa_g_audit]);
932 static int param_set_audit(const char *val, struct kernel_param *kp)
935 if (!capable(CAP_MAC_ADMIN))
938 if (!apparmor_enabled)
944 for (i = 0; i < AUDIT_MAX_INDEX; i++) {
945 if (strcmp(val, audit_mode_names[i]) == 0) {
954 static int param_get_mode(char *buffer, struct kernel_param *kp)
956 if (!capable(CAP_MAC_ADMIN))
959 if (!apparmor_enabled)
962 return sprintf(buffer, "%s", profile_mode_names[aa_g_profile_mode]);
965 static int param_set_mode(const char *val, struct kernel_param *kp)
968 if (!capable(CAP_MAC_ADMIN))
971 if (!apparmor_enabled)
977 for (i = 0; i < APPARMOR_NAMES_MAX_INDEX; i++) {
978 if (strcmp(val, profile_mode_names[i]) == 0) {
979 aa_g_profile_mode = i;
988 * AppArmor init functions
992 * set_init_cxt - set a task context and profile on the first task.
994 * TODO: allow setting an alternate profile than unconfined
996 static int __init set_init_cxt(void)
998 struct cred *cred = (struct cred *)current->real_cred;
999 struct aa_task_cxt *cxt;
1001 cxt = aa_alloc_task_context(GFP_KERNEL);
1005 cxt->profile = aa_get_profile(root_ns->unconfined);
1006 cred->security = cxt;
1011 static int __init apparmor_init(void)
1015 if (!apparmor_enabled || !security_module_enable(&apparmor_ops)) {
1016 aa_info_message("AppArmor disabled by boot time parameter");
1017 apparmor_enabled = 0;
1021 error = aa_alloc_root_ns();
1023 AA_ERROR("Unable to allocate default profile namespace\n");
1027 error = set_init_cxt();
1029 AA_ERROR("Failed to set context on init task\n");
1030 goto register_security_out;
1033 error = register_security(&apparmor_ops);
1035 AA_ERROR("Unable to register AppArmor\n");
1036 goto set_init_cxt_out;
1039 /* Report that AppArmor successfully initialized */
1040 apparmor_initialized = 1;
1041 if (aa_g_profile_mode == APPARMOR_COMPLAIN)
1042 aa_info_message("AppArmor initialized: complain mode enabled");
1043 else if (aa_g_profile_mode == APPARMOR_KILL)
1044 aa_info_message("AppArmor initialized: kill mode enabled");
1046 aa_info_message("AppArmor initialized");
1051 aa_free_task_context(current->real_cred->security);
1053 register_security_out:
1059 apparmor_enabled = 0;
1063 security_initcall(apparmor_init);