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/lsm_hooks.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/af_unix.h"
29 #include "include/apparmor.h"
30 #include "include/apparmorfs.h"
31 #include "include/audit.h"
32 #include "include/capability.h"
33 #include "include/context.h"
34 #include "include/file.h"
35 #include "include/ipc.h"
36 #include "include/net.h"
37 #include "include/path.h"
38 #include "include/policy.h"
39 #include "include/procattr.h"
40 #include "include/mount.h"
42 /* Flag indicating whether initialization completed */
43 int apparmor_initialized __initdata
;
45 DEFINE_PER_CPU(struct aa_buffers
, aa_buffers
);
53 * free the associated aa_task_ctx and put its labels
55 static void apparmor_cred_free(struct cred
*cred
)
57 aa_free_task_context(cred_ctx(cred
));
58 cred_ctx(cred
) = NULL
;
62 * allocate the apparmor part of blank credentials
64 static int apparmor_cred_alloc_blank(struct cred
*cred
, gfp_t gfp
)
66 /* freed by apparmor_cred_free */
67 struct aa_task_ctx
*ctx
= aa_alloc_task_context(gfp
);
76 * prepare new aa_task_ctx for modification by prepare_cred block
78 static int apparmor_cred_prepare(struct cred
*new, const struct cred
*old
,
81 /* freed by apparmor_cred_free */
82 struct aa_task_ctx
*ctx
= aa_alloc_task_context(gfp
);
86 aa_dup_task_context(ctx
, cred_ctx(old
));
92 * transfer the apparmor data to a blank set of creds
94 static void apparmor_cred_transfer(struct cred
*new, const struct cred
*old
)
96 const struct aa_task_ctx
*old_ctx
= cred_ctx(old
);
97 struct aa_task_ctx
*new_ctx
= cred_ctx(new);
99 aa_dup_task_context(new_ctx
, old_ctx
);
102 static int apparmor_ptrace_access_check(struct task_struct
*child
,
105 struct aa_label
*tracer
, *tracee
;
108 tracer
= aa_begin_current_label(DO_UPDATE
);
109 tracee
= aa_get_task_label(child
);
110 error
= aa_may_ptrace(tracer
, tracee
,
111 mode
== PTRACE_MODE_READ
? AA_PTRACE_READ
: AA_PTRACE_TRACE
);
112 aa_put_label(tracee
);
113 aa_end_current_label(tracer
);
118 static int apparmor_ptrace_traceme(struct task_struct
*parent
)
120 struct aa_label
*tracer
, *tracee
;
123 tracee
= aa_begin_current_label(DO_UPDATE
);
124 tracer
= aa_get_task_label(parent
);
125 error
= aa_may_ptrace(tracer
, tracee
, AA_PTRACE_TRACE
);
126 aa_put_label(tracer
);
127 aa_end_current_label(tracee
);
132 /* Derived from security/commoncap.c:cap_capget */
133 static int apparmor_capget(struct task_struct
*target
, kernel_cap_t
*effective
,
134 kernel_cap_t
*inheritable
, kernel_cap_t
*permitted
)
136 struct aa_label
*label
;
137 const struct cred
*cred
;
140 cred
= __task_cred(target
);
141 label
= aa_get_newest_cred_label(cred
);
144 * cap_capget is stacked ahead of this and will
145 * initialize effective and permitted.
147 if (!unconfined(label
)) {
148 struct aa_profile
*profile
;
150 label_for_each_confined(i
, label
, profile
) {
151 if (COMPLAIN_MODE(profile
))
153 *effective
= cap_intersect(*effective
,
154 profile
->caps
.allow
);
155 *permitted
= cap_intersect(*permitted
,
156 profile
->caps
.allow
);
165 static int apparmor_capable(const struct cred
*cred
, struct user_namespace
*ns
,
168 struct aa_label
*label
;
171 label
= aa_get_newest_cred_label(cred
);
172 if (!unconfined(label
))
173 error
= aa_capable(label
, cap
, audit
);
180 * common_perm - basic common permission check wrapper fn for paths
181 * @op: operation being checked
182 * @path: path to check permission of (NOT NULL)
183 * @mask: requested permissions mask
184 * @cond: conditional info for the permission request (NOT NULL)
186 * Returns: %0 else error code if error or permission denied
188 static int common_perm(const char *op
, const struct path
*path
, u32 mask
,
189 struct path_cond
*cond
)
191 struct aa_label
*label
;
194 label
= aa_begin_current_label(NO_UPDATE
);
195 if (!unconfined(label
))
196 error
= aa_path_perm(op
, label
, path
, 0, mask
, cond
);
197 aa_end_current_label(label
);
202 static int common_perm_cond(const char *op
, const struct path
*path
, u32 mask
)
204 struct path_cond cond
= { d_backing_inode(path
->dentry
)->i_uid
,
205 d_backing_inode(path
->dentry
)->i_mode
208 if (!path_mediated_fs(path
->dentry
))
211 return common_perm(op
, path
, mask
, &cond
);
214 static void apparmor_inode_free_security(struct inode
*inode
)
216 struct aa_label
*ctx
= inode_ctx(inode
);
219 inode_ctx(inode
) = NULL
;
225 * common_perm_dir_dentry - common permission wrapper when path is dir, dentry
226 * @op: operation being checked
227 * @dir: directory of the dentry (NOT NULL)
228 * @dentry: dentry to check (NOT NULL)
229 * @mask: requested permissions mask
230 * @cond: conditional info for the permission request (NOT NULL)
232 * Returns: %0 else error code if error or permission denied
234 static int common_perm_dir_dentry(const char *op
, const struct path
*dir
,
235 struct dentry
*dentry
, u32 mask
,
236 struct path_cond
*cond
)
238 struct path path
= { dir
->mnt
, dentry
};
240 return common_perm(op
, &path
, mask
, cond
);
244 * common_perm_rm - common permission wrapper for operations doing rm
245 * @op: operation being checked
246 * @dir: directory that the dentry is in (NOT NULL)
247 * @dentry: dentry being rm'd (NOT NULL)
248 * @mask: requested permission mask
250 * Returns: %0 else error code if error or permission denied
252 static int common_perm_rm(const char *op
, const struct path
*dir
,
253 struct dentry
*dentry
, u32 mask
)
255 struct inode
*inode
= d_backing_inode(dentry
);
256 struct path_cond cond
= { };
258 if (!inode
|| !path_mediated_fs(dentry
))
261 cond
.uid
= inode
->i_uid
;
262 cond
.mode
= inode
->i_mode
;
264 return common_perm_dir_dentry(op
, dir
, dentry
, mask
, &cond
);
268 * common_perm_create - common permission wrapper for operations doing create
269 * @op: operation being checked
270 * @dir: directory that dentry will be created in (NOT NULL)
271 * @dentry: dentry to create (NOT NULL)
272 * @mask: request permission mask
273 * @mode: created file mode
275 * Returns: %0 else error code if error or permission denied
277 static int common_perm_create(const char *op
, const struct path
*dir
,
278 struct dentry
*dentry
, u32 mask
, umode_t mode
)
280 struct path_cond cond
= { current_fsuid(), mode
};
282 if (!path_mediated_fs(dir
->dentry
))
285 return common_perm_dir_dentry(op
, dir
, dentry
, mask
, &cond
);
288 static int apparmor_path_unlink(const struct path
*dir
, struct dentry
*dentry
)
290 return common_perm_rm(OP_UNLINK
, dir
, dentry
, AA_MAY_DELETE
);
293 static int apparmor_path_mkdir(const struct path
*dir
, struct dentry
*dentry
,
296 return common_perm_create(OP_MKDIR
, dir
, dentry
, AA_MAY_CREATE
,
300 static int apparmor_path_rmdir(const struct path
*dir
, struct dentry
*dentry
)
302 return common_perm_rm(OP_RMDIR
, dir
, dentry
, AA_MAY_DELETE
);
305 static int apparmor_path_mknod(const struct path
*dir
, struct dentry
*dentry
,
306 umode_t mode
, unsigned int dev
)
308 return common_perm_create(OP_MKNOD
, dir
, dentry
, AA_MAY_CREATE
, mode
);
311 static int apparmor_path_truncate(const struct path
*path
)
313 return common_perm_cond(OP_TRUNC
, path
, MAY_WRITE
| AA_MAY_SETATTR
);
316 static int apparmor_path_symlink(const struct path
*dir
, struct dentry
*dentry
,
317 const char *old_name
)
319 return common_perm_create(OP_SYMLINK
, dir
, dentry
, AA_MAY_CREATE
,
323 static int apparmor_path_link(struct dentry
*old_dentry
, const struct path
*new_dir
,
324 struct dentry
*new_dentry
)
326 struct aa_label
*label
;
329 if (!path_mediated_fs(old_dentry
))
332 label
= aa_begin_current_label(DO_UPDATE
);
333 if (!unconfined(label
))
334 error
= aa_path_link(label
, old_dentry
, new_dir
, new_dentry
);
335 aa_end_current_label(label
);
340 static int apparmor_path_rename(const struct path
*old_dir
, struct dentry
*old_dentry
,
341 const struct path
*new_dir
, struct dentry
*new_dentry
)
343 struct aa_label
*label
;
346 if (!path_mediated_fs(old_dentry
))
349 label
= aa_begin_current_label(DO_UPDATE
);
350 if (!unconfined(label
)) {
351 struct path old_path
= { old_dir
->mnt
, old_dentry
};
352 struct path new_path
= { new_dir
->mnt
, new_dentry
};
353 struct path_cond cond
= { d_backing_inode(old_dentry
)->i_uid
,
354 d_backing_inode(old_dentry
)->i_mode
357 error
= aa_path_perm(OP_RENAME_SRC
, label
, &old_path
, 0,
358 MAY_READ
| AA_MAY_GETATTR
| MAY_WRITE
|
359 AA_MAY_SETATTR
| AA_MAY_DELETE
,
362 error
= aa_path_perm(OP_RENAME_DEST
, label
, &new_path
,
363 0, MAY_WRITE
| AA_MAY_SETATTR
|
364 AA_MAY_CREATE
, &cond
);
367 aa_end_current_label(label
);
372 static int apparmor_path_chmod(const struct path
*path
, umode_t mode
)
374 return common_perm_cond(OP_CHMOD
, path
, AA_MAY_CHMOD
);
377 static int apparmor_path_chown(const struct path
*path
, kuid_t uid
, kgid_t gid
)
379 return common_perm_cond(OP_CHOWN
, path
, AA_MAY_CHOWN
);
382 static int apparmor_inode_getattr(const struct path
*path
)
384 return common_perm_cond(OP_GETATTR
, path
, AA_MAY_GETATTR
);
387 static int apparmor_file_open(struct file
*file
, const struct cred
*cred
)
389 struct aa_file_ctx
*fctx
= file_ctx(file
);
390 struct aa_label
*label
;
393 if (!path_mediated_fs(file
->f_path
.dentry
))
396 /* If in exec, permission is handled by bprm hooks.
397 * Cache permissions granted by the previous exec check, with
398 * implicit read and executable mmap which are required to
399 * actually execute the image.
401 if (current
->in_execve
) {
402 fctx
->allow
= MAY_EXEC
| MAY_READ
| AA_EXEC_MMAP
;
406 label
= aa_get_newest_cred_label(cred
);
407 if (!unconfined(label
)) {
408 struct inode
*inode
= file_inode(file
);
409 struct path_cond cond
= { inode
->i_uid
, inode
->i_mode
};
411 error
= aa_path_perm(OP_OPEN
, label
, &file
->f_path
, 0,
412 aa_map_file_to_perms(file
), &cond
);
413 /* todo cache full allowed permissions set and state */
414 fctx
->allow
= aa_map_file_to_perms(file
);
421 static int apparmor_file_alloc_security(struct file
*file
)
425 /* freed by apparmor_file_free_security */
426 struct aa_label
*label
= aa_begin_current_label(DO_UPDATE
);
427 file
->f_security
= aa_alloc_file_ctx(label
, GFP_KERNEL
);
430 aa_end_current_label(label
);
435 static void apparmor_file_free_security(struct file
*file
)
437 aa_free_file_ctx(file_ctx(file
));
440 static int common_file_perm(const char *op
, struct file
*file
, u32 mask
)
442 struct aa_label
*label
;
445 label
= aa_begin_current_label(NO_UPDATE
);
446 error
= aa_file_perm(op
, label
, file
, mask
);
447 aa_end_current_label(label
);
452 static int apparmor_file_receive(struct file
*file
)
454 return common_file_perm(OP_FRECEIVE
, file
, aa_map_file_to_perms(file
));
457 static int apparmor_file_permission(struct file
*file
, int mask
)
459 return common_file_perm(OP_FPERM
, file
, mask
);
462 static int apparmor_file_lock(struct file
*file
, unsigned int cmd
)
464 u32 mask
= AA_MAY_LOCK
;
469 return common_file_perm(OP_FLOCK
, file
, mask
);
472 static int common_mmap(const char *op
, struct file
*file
, unsigned long prot
,
477 if (!file
|| !file_ctx(file
))
480 if (prot
& PROT_READ
)
483 * Private mappings don't require write perms since they don't
484 * write back to the files
486 if ((prot
& PROT_WRITE
) && !(flags
& MAP_PRIVATE
))
488 if (prot
& PROT_EXEC
)
489 mask
|= AA_EXEC_MMAP
;
491 return common_file_perm(op
, file
, mask
);
494 static int apparmor_mmap_file(struct file
*file
, unsigned long reqprot
,
495 unsigned long prot
, unsigned long flags
)
497 return common_mmap(OP_FMMAP
, file
, prot
, flags
);
500 static int apparmor_file_mprotect(struct vm_area_struct
*vma
,
501 unsigned long reqprot
, unsigned long prot
)
503 return common_mmap(OP_FMPROT
, vma
->vm_file
, prot
,
504 !(vma
->vm_flags
& VM_SHARED
) ? MAP_PRIVATE
: 0);
507 static int apparmor_sb_mount(const char *dev_name
, const struct path
*path
,
508 const char *type
, unsigned long flags
, void *data
)
510 struct aa_label
*label
;
514 if ((flags
& MS_MGC_MSK
) == MS_MGC_VAL
)
515 flags
&= ~MS_MGC_MSK
;
517 flags
&= ~AA_MS_IGNORE_MASK
;
519 label
= aa_begin_current_label(NO_UPDATE
);
520 if (!unconfined(label
)) {
521 if (flags
& MS_REMOUNT
)
522 error
= aa_remount(label
, path
, flags
, data
);
523 else if (flags
& MS_BIND
)
524 error
= aa_bind_mount(label
, path
, dev_name
, flags
);
525 else if (flags
& (MS_SHARED
| MS_PRIVATE
| MS_SLAVE
|
527 error
= aa_mount_change_type(label
, path
, flags
);
528 else if (flags
& MS_MOVE
)
529 error
= aa_move_mount(label
, path
, dev_name
);
531 error
= aa_new_mount(label
, dev_name
, path
, type
,
534 aa_end_current_label(label
);
539 static int apparmor_sb_umount(struct vfsmount
*mnt
, int flags
)
541 struct aa_label
*label
;
544 label
= aa_begin_current_label(NO_UPDATE
);
545 if (!unconfined(label
))
546 error
= aa_umount(label
, mnt
, flags
);
547 aa_end_current_label(label
);
552 static int apparmor_sb_pivotroot(const struct path
*old_path
,
553 const struct path
*new_path
)
555 struct aa_label
*label
;
558 label
= aa_get_current_label();
559 if (!unconfined(label
))
560 error
= aa_pivotroot(label
, old_path
, new_path
);
566 static int apparmor_getprocattr(struct task_struct
*task
, char *name
,
571 const struct cred
*cred
= get_task_cred(task
);
572 struct aa_task_ctx
*ctx
= cred_ctx(cred
);
573 struct aa_label
*label
= NULL
;
575 if (strcmp(name
, "current") == 0)
576 label
= aa_get_newest_label(ctx
->label
);
577 else if (strcmp(name
, "prev") == 0 && ctx
->previous
)
578 label
= aa_get_newest_label(ctx
->previous
);
579 else if (strcmp(name
, "exec") == 0 && ctx
->onexec
)
580 label
= aa_get_newest_label(ctx
->onexec
);
585 error
= aa_getprocattr(label
, value
);
593 static int apparmor_setprocattr(struct task_struct
*task
, char *name
,
594 void *value
, size_t size
)
596 char *command
, *largs
= NULL
, *args
= value
;
599 DEFINE_AUDIT_DATA(sa
, LSM_AUDIT_DATA_NONE
, OP_SETPROCATTR
);
603 /* task can only write its own attributes */
607 /* AppArmor requires that the buffer must be null terminated atm */
608 if (args
[size
- 1] != '\0') {
610 largs
= args
= kmalloc(size
+ 1, GFP_KERNEL
);
613 memcpy(args
, value
, size
);
619 command
= strsep(&args
, " ");
622 args
= skip_spaces(args
);
626 arg_size
= size
- (args
- (largs
? largs
: (char *) value
));
627 if (strcmp(name
, "current") == 0) {
628 if (strcmp(command
, "changehat") == 0) {
629 error
= aa_setprocattr_changehat(args
, arg_size
,
631 } else if (strcmp(command
, "permhat") == 0) {
632 error
= aa_setprocattr_changehat(args
, arg_size
,
634 } else if (strcmp(command
, "changeprofile") == 0) {
635 error
= aa_change_profile(args
, !AA_ONEXEC
,
637 } else if (strcmp(command
, "permprofile") == 0) {
638 error
= aa_change_profile(args
, !AA_ONEXEC
, AA_DO_TEST
,
640 } else if (strcmp(command
, "stack") == 0) {
641 error
= aa_change_profile(args
, !AA_ONEXEC
, !AA_DO_TEST
,
645 } else if (strcmp(name
, "exec") == 0) {
646 if (strcmp(command
, "exec") == 0)
647 error
= aa_change_profile(args
, AA_ONEXEC
, !AA_DO_TEST
,
649 else if (strcmp(command
, "stack") == 0)
650 error
= aa_change_profile(args
, AA_ONEXEC
, !AA_DO_TEST
,
655 /* only support the "current" and "exec" process attributes */
665 aad(&sa
)->label
= aa_begin_current_label(DO_UPDATE
);
666 aad(&sa
)->info
= name
;
667 aad(&sa
)->error
= error
= -EINVAL
;
668 aa_audit_msg(AUDIT_APPARMOR_DENIED
, &sa
, NULL
);
669 aa_end_current_label(aad(&sa
)->label
);
674 * apparmor_bprm_committing_creds - do task cleanup on committing new creds
675 * @bprm: binprm for the exec (NOT NULL)
677 void apparmor_bprm_committing_creds(struct linux_binprm
*bprm
)
679 struct aa_label
*label
= aa_current_raw_label();
680 struct aa_task_ctx
*new_ctx
= cred_ctx(bprm
->cred
);
682 /* bail out if unconfined or not changing profile */
683 if ((new_ctx
->label
->proxy
== label
->proxy
) ||
684 (unconfined(new_ctx
->label
)))
687 aa_inherit_files(bprm
->cred
, current
->files
);
689 current
->pdeath_signal
= 0;
691 /* reset soft limits and set hard limits for the new label */
692 __aa_transition_rlimits(label
, new_ctx
->label
);
696 * apparmor_bprm_commited_cred - do cleanup after new creds committed
697 * @bprm: binprm for the exec (NOT NULL)
699 void apparmor_bprm_committed_creds(struct linux_binprm
*bprm
)
701 /* TODO: cleanup signals - ipc mediation */
705 static int apparmor_task_setrlimit(struct task_struct
*task
,
706 unsigned int resource
, struct rlimit
*new_rlim
)
708 struct aa_label
*label
= aa_begin_current_label(NO_UPDATE
);
711 if (!unconfined(label
))
712 error
= aa_task_setrlimit(label
, task
, resource
, new_rlim
);
713 aa_end_current_label(label
);
719 * apparmor_sk_alloc_security - allocate and attach the sk_security field
721 static int apparmor_sk_alloc_security(struct sock
*sk
, int family
, gfp_t flags
)
723 struct aa_sk_ctx
*ctx
;
725 ctx
= kzalloc(sizeof(*ctx
), flags
);
730 //??? set local too current???
736 * apparmor_sk_free_security - free the sk_security field
738 static void apparmor_sk_free_security(struct sock
*sk
)
740 struct aa_sk_ctx
*ctx
= SK_CTX(sk
);
743 aa_put_label(ctx
->label
);
744 aa_put_label(ctx
->peer
);
745 path_put(&ctx
->path
);
750 * apparmor_clone_security - clone the sk_security field
752 static void apparmor_sk_clone_security(const struct sock
*sk
,
755 struct aa_sk_ctx
*ctx
= SK_CTX(sk
);
756 struct aa_sk_ctx
*new = SK_CTX(newsk
);
758 new->label
= aa_get_label(ctx
->label
);
759 new->peer
= aa_get_label(ctx
->peer
);
760 new->path
= ctx
->path
;
761 path_get(&new->path
);
764 static struct path
*UNIX_FS_CONN_PATH(struct sock
*sk
, struct sock
*newsk
)
766 if (sk
->sk_family
== PF_UNIX
&& UNIX_FS(sk
))
767 return &unix_sk(sk
)->path
;
768 else if (newsk
->sk_family
== PF_UNIX
&& UNIX_FS(newsk
))
769 return &unix_sk(newsk
)->path
;
774 * apparmor_unix_stream_connect - check perms before making unix domain conn
776 * peer is locked when this hook is called
778 static int apparmor_unix_stream_connect(struct sock
*sk
, struct sock
*peer_sk
,
781 struct aa_sk_ctx
*sk_ctx
= SK_CTX(sk
);
782 struct aa_sk_ctx
*peer_ctx
= SK_CTX(peer_sk
);
783 struct aa_sk_ctx
*new_ctx
= SK_CTX(newsk
);
784 struct aa_label
*label
;
788 label
= aa_begin_current_label(NO_UPDATE
);
789 error
= aa_unix_peer_perm(label
, OP_CONNECT
,
790 (AA_MAY_CONNECT
| AA_MAY_SEND
| AA_MAY_RECEIVE
),
792 if (!UNIX_FS(peer_sk
)) {
794 aa_unix_peer_perm(peer_ctx
->label
, OP_CONNECT
,
795 (AA_MAY_ACCEPT
| AA_MAY_SEND
| AA_MAY_RECEIVE
),
796 peer_sk
, sk
, label
));
798 aa_end_current_label(label
);
803 /* label newsk if it wasn't labeled in post_create. Normally this
804 * would be done in sock_graft, but because we are directly looking
805 * at the peer_sk to obtain peer_labeling for unix socks this
809 new_ctx
->label
= aa_get_label(peer_ctx
->label
);
811 /* Cross reference the peer labels for SO_PEERSEC */
813 aa_put_label(new_ctx
->peer
);
816 aa_put_label(sk_ctx
->peer
);
818 new_ctx
->peer
= aa_get_label(sk_ctx
->label
);
819 sk_ctx
->peer
= aa_get_label(peer_ctx
->label
);
821 path
= UNIX_FS_CONN_PATH(sk
, peer_sk
);
823 new_ctx
->path
= *path
;
824 sk_ctx
->path
= *path
;
832 * apparmor_unix_may_send - check perms before conn or sending unix dgrams
834 * other is locked when this hook is called
836 * dgram connect calls may_send, peer setup but path not copied?????
838 static int apparmor_unix_may_send(struct socket
*sock
, struct socket
*peer
)
840 struct aa_sk_ctx
*peer_ctx
= SK_CTX(peer
->sk
);
841 struct aa_label
*label
= aa_begin_current_label(NO_UPDATE
);
844 error
= xcheck(aa_unix_peer_perm(label
, OP_SENDMSG
, AA_MAY_SEND
,
845 sock
->sk
, peer
->sk
, NULL
),
846 aa_unix_peer_perm(peer_ctx
->label
, OP_SENDMSG
, AA_MAY_RECEIVE
,
847 peer
->sk
, sock
->sk
, label
));
848 aa_end_current_label(label
);
854 * apparmor_socket_create - check perms before creating a new socket
856 static int apparmor_socket_create(int family
, int type
, int protocol
, int kern
)
858 struct aa_label
*label
;
861 label
= aa_begin_current_label(DO_UPDATE
);
862 if (!(kern
|| unconfined(label
)))
863 error
= aa_sock_create_perm(label
, family
, type
, protocol
);
864 aa_end_current_label(label
);
870 * apparmor_socket_post_create - setup the per-socket security struct
873 * - kernel sockets currently labeled unconfined but we may want to
874 * move to a special kernel label
875 * - socket may not have sk here if created with sock_create_lite or
876 * sock_alloc. These should be accept cases which will be handled in
879 static int apparmor_socket_post_create(struct socket
*sock
, int family
,
880 int type
, int protocol
, int kern
)
882 struct aa_label
*label
;
885 struct aa_ns
*ns
= aa_get_current_ns();
886 label
= aa_get_label(ns_unconfined(ns
));
889 label
= aa_get_current_label();
892 struct aa_sk_ctx
*ctx
= SK_CTX(sock
->sk
);
893 aa_put_label(ctx
->label
);
894 ctx
->label
= aa_get_label(label
);
902 * apparmor_socket_bind - check perms before bind addr to socket
904 static int apparmor_socket_bind(struct socket
*sock
,
905 struct sockaddr
*address
, int addrlen
)
907 return aa_sock_bind_perm(sock
, address
, addrlen
);
911 * apparmor_socket_connect - check perms before connecting @sock to @address
913 static int apparmor_socket_connect(struct socket
*sock
,
914 struct sockaddr
*address
, int addrlen
)
916 return aa_sock_connect_perm(sock
, address
, addrlen
);
920 * apparmor_socket_list - check perms before allowing listen
922 static int apparmor_socket_listen(struct socket
*sock
, int backlog
)
924 return aa_sock_listen_perm(sock
, backlog
);
928 * apparmor_socket_accept - check perms before accepting a new connection.
930 * Note: while @newsock is created and has some information, the accept
933 static int apparmor_socket_accept(struct socket
*sock
, struct socket
*newsock
)
935 return aa_sock_accept_perm(sock
, newsock
);
939 * apparmor_socket_sendmsg - check perms before sending msg to another socket
941 static int apparmor_socket_sendmsg(struct socket
*sock
,
942 struct msghdr
*msg
, int size
)
944 int error
= aa_sock_msg_perm(OP_SENDMSG
, AA_MAY_SEND
, sock
, msg
, size
);
946 /* TODO: setup delegation on scm rights
947 see smack for AF_INET, AF_INET6 */
955 * apparmor_socket_recvmsg - check perms before receiving a message
957 static int apparmor_socket_recvmsg(struct socket
*sock
,
958 struct msghdr
*msg
, int size
, int flags
)
960 return aa_sock_msg_perm(OP_RECVMSG
, AA_MAY_RECEIVE
, sock
, msg
, size
);
964 * apparmor_socket_getsockname - check perms before getting the local address
966 static int apparmor_socket_getsockname(struct socket
*sock
)
968 return aa_sock_perm(OP_GETSOCKNAME
, AA_MAY_GETATTR
, sock
);
972 * apparmor_socket_getpeername - check perms before getting remote address
974 static int apparmor_socket_getpeername(struct socket
*sock
)
976 return aa_sock_perm(OP_GETPEERNAME
, AA_MAY_GETATTR
, sock
);
980 * apparmor_getsockopt - check perms before getting socket options
982 static int apparmor_socket_getsockopt(struct socket
*sock
, int level
,
985 return aa_sock_opt_perm(OP_GETSOCKOPT
, AA_MAY_GETOPT
, sock
,
990 * apparmor_setsockopt - check perms before setting socket options
992 static int apparmor_socket_setsockopt(struct socket
*sock
, int level
,
995 return aa_sock_opt_perm(OP_SETSOCKOPT
, AA_MAY_SETOPT
, sock
,
1000 * apparmor_socket_shutdown - check perms before shutting down @sock conn
1002 static int apparmor_socket_shutdown(struct socket
*sock
, int how
)
1004 return aa_sock_perm(OP_SHUTDOWN
, AA_MAY_SHUTDOWN
, sock
);
1008 * apparmor_socket_sock_recv_skb - check perms before associating skb to sk
1010 * Note: can not sleep maybe called with locks held
1012 dont want protocol specific in __skb_recv_datagram()
1013 to deny an incoming connection socket_sock_rcv_skb()
1016 static int apparmor_socket_sock_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
1023 static struct aa_label
*sk_peer_label(struct sock
*sk
)
1025 struct sock
*peer_sk
;
1026 struct aa_sk_ctx
*ctx
= SK_CTX(sk
);
1031 if (sk
->sk_family
!= PF_UNIX
)
1032 return ERR_PTR(-ENOPROTOOPT
);
1034 /* check for sockpair peering which does not go through
1035 * security_unix_stream_connect
1037 peer_sk
= unix_peer(sk
);
1039 ctx
= SK_CTX(peer_sk
);
1044 return ERR_PTR(-ENOPROTOOPT
);
1048 * apparmor_socket_getpeersec_stream - get security context of peer
1050 * Note: for tcp only valid if using ipsec or cipso on lan
1052 static int apparmor_socket_getpeersec_stream(struct socket
*sock
,
1053 char __user
*optval
,
1054 int __user
*optlen
, unsigned len
)
1057 int slen
, error
= 0;
1058 struct aa_label
*label
= aa_begin_current_label(DO_UPDATE
);
1059 struct aa_label
*peer
= sk_peer_label(sock
->sk
);
1062 return PTR_ERR(peer
);
1064 slen
= aa_label_asxprint(&name
, labels_ns(label
), peer
,
1065 FLAG_SHOW_MODE
| FLAG_VIEW_SUBNS
|
1066 FLAG_HIDDEN_UNCONFINED
, GFP_KERNEL
);
1067 /* don't include terminating \0 in slen, it breaks some apps */
1073 } else if (copy_to_user(optval
, name
, slen
)) {
1077 if (put_user(slen
, optlen
))
1083 aa_end_current_label(label
);
1089 * apparmor_socket_getpeersec_dgram - get security label of packet
1090 * @sock: the peer socket
1092 * @secid: pointer to where to put the secid of the packet
1094 * Sets the netlabel socket state on sk from parent
1096 static int apparmor_socket_getpeersec_dgram(struct socket
*sock
,
1097 struct sk_buff
*skb
, u32
*secid
)
1100 /* TODO: requires secid support, and netlabel */
1101 return -ENOPROTOOPT
;
1105 * apparmor_sock_graft - Initialize newly created socket
1107 * @parent: parent socket
1109 * Note: could set off of SOCK_CTX(parent) but need to track inode and we can
1110 * just set sk security information off of current creating process label
1111 * Labeling of sk for accept case - probably should be sock based
1112 * instead of task, because of the case where an implicitly labeled
1113 * socket is shared by different tasks.
1115 static void apparmor_sock_graft(struct sock
*sk
, struct socket
*parent
)
1117 struct aa_sk_ctx
*ctx
= SK_CTX(sk
);
1119 ctx
->label
= aa_get_current_label();
1122 static int apparmor_task_kill(struct task_struct
*target
, struct siginfo
*info
,
1125 struct aa_label
*cl
, *tl
;
1129 /* TODO: after secid to label mapping is done.
1130 * Dealing with USB IO specific behavior
1133 cl
= aa_begin_current_label(NO_UPDATE
);
1134 tl
= aa_get_task_label(target
);
1135 error
= aa_may_signal(cl
, tl
, sig
);
1137 aa_end_current_label(cl
);
1142 #ifndef LSM_HOOKS_NAME
1143 #define LSM_HOOKS_NAME(X) //.name = (X),
1145 static struct security_hook_list apparmor_hooks
[] = {
1146 LSM_HOOKS_NAME("apparmor")
1148 LSM_HOOK_INIT(ptrace_access_check
, apparmor_ptrace_access_check
),
1149 LSM_HOOK_INIT(ptrace_traceme
, apparmor_ptrace_traceme
),
1150 LSM_HOOK_INIT(capget
, apparmor_capget
),
1151 LSM_HOOK_INIT(capable
, apparmor_capable
),
1153 LSM_HOOK_INIT(inode_free_security
, apparmor_inode_free_security
),
1155 LSM_HOOK_INIT(sb_mount
, apparmor_sb_mount
),
1156 LSM_HOOK_INIT(sb_umount
, apparmor_sb_umount
),
1157 LSM_HOOK_INIT(sb_pivotroot
, apparmor_sb_pivotroot
),
1159 LSM_HOOK_INIT(path_link
, apparmor_path_link
),
1160 LSM_HOOK_INIT(path_unlink
, apparmor_path_unlink
),
1161 LSM_HOOK_INIT(path_symlink
, apparmor_path_symlink
),
1162 LSM_HOOK_INIT(path_mkdir
, apparmor_path_mkdir
),
1163 LSM_HOOK_INIT(path_rmdir
, apparmor_path_rmdir
),
1164 LSM_HOOK_INIT(path_mknod
, apparmor_path_mknod
),
1165 LSM_HOOK_INIT(path_rename
, apparmor_path_rename
),
1166 LSM_HOOK_INIT(path_chmod
, apparmor_path_chmod
),
1167 LSM_HOOK_INIT(path_chown
, apparmor_path_chown
),
1168 LSM_HOOK_INIT(path_truncate
, apparmor_path_truncate
),
1169 LSM_HOOK_INIT(inode_getattr
, apparmor_inode_getattr
),
1171 LSM_HOOK_INIT(file_open
, apparmor_file_open
),
1172 LSM_HOOK_INIT(file_receive
, apparmor_file_receive
),
1173 LSM_HOOK_INIT(file_permission
, apparmor_file_permission
),
1174 LSM_HOOK_INIT(file_alloc_security
, apparmor_file_alloc_security
),
1175 LSM_HOOK_INIT(file_free_security
, apparmor_file_free_security
),
1176 LSM_HOOK_INIT(mmap_file
, apparmor_mmap_file
),
1177 LSM_HOOK_INIT(mmap_addr
, cap_mmap_addr
),
1178 LSM_HOOK_INIT(file_mprotect
, apparmor_file_mprotect
),
1179 LSM_HOOK_INIT(file_lock
, apparmor_file_lock
),
1181 LSM_HOOK_INIT(getprocattr
, apparmor_getprocattr
),
1182 LSM_HOOK_INIT(setprocattr
, apparmor_setprocattr
),
1184 LSM_HOOK_INIT(sk_alloc_security
, apparmor_sk_alloc_security
),
1185 LSM_HOOK_INIT(sk_free_security
, apparmor_sk_free_security
),
1186 LSM_HOOK_INIT(sk_clone_security
, apparmor_sk_clone_security
),
1188 LSM_HOOK_INIT(unix_stream_connect
, apparmor_unix_stream_connect
),
1189 LSM_HOOK_INIT(unix_may_send
, apparmor_unix_may_send
),
1191 LSM_HOOK_INIT(socket_create
, apparmor_socket_create
),
1192 LSM_HOOK_INIT(socket_post_create
, apparmor_socket_post_create
),
1193 LSM_HOOK_INIT(socket_bind
, apparmor_socket_bind
),
1194 LSM_HOOK_INIT(socket_connect
, apparmor_socket_connect
),
1195 LSM_HOOK_INIT(socket_listen
, apparmor_socket_listen
),
1196 LSM_HOOK_INIT(socket_accept
, apparmor_socket_accept
),
1197 LSM_HOOK_INIT(socket_sendmsg
, apparmor_socket_sendmsg
),
1198 LSM_HOOK_INIT(socket_recvmsg
, apparmor_socket_recvmsg
),
1199 LSM_HOOK_INIT(socket_getsockname
, apparmor_socket_getsockname
),
1200 LSM_HOOK_INIT(socket_getpeername
, apparmor_socket_getpeername
),
1201 LSM_HOOK_INIT(socket_getsockopt
, apparmor_socket_getsockopt
),
1202 LSM_HOOK_INIT(socket_setsockopt
, apparmor_socket_setsockopt
),
1203 LSM_HOOK_INIT(socket_shutdown
, apparmor_socket_shutdown
),
1204 LSM_HOOK_INIT(socket_sock_rcv_skb
, apparmor_socket_sock_rcv_skb
),
1205 LSM_HOOK_INIT(socket_getpeersec_stream
, apparmor_socket_getpeersec_stream
),
1206 LSM_HOOK_INIT(socket_getpeersec_dgram
, apparmor_socket_getpeersec_dgram
),
1207 LSM_HOOK_INIT(sock_graft
, apparmor_sock_graft
),
1209 LSM_HOOK_INIT(cred_alloc_blank
, apparmor_cred_alloc_blank
),
1210 LSM_HOOK_INIT(cred_free
, apparmor_cred_free
),
1211 LSM_HOOK_INIT(cred_prepare
, apparmor_cred_prepare
),
1212 LSM_HOOK_INIT(cred_transfer
, apparmor_cred_transfer
),
1214 LSM_HOOK_INIT(bprm_set_creds
, apparmor_bprm_set_creds
),
1215 LSM_HOOK_INIT(bprm_committing_creds
, apparmor_bprm_committing_creds
),
1216 LSM_HOOK_INIT(bprm_committed_creds
, apparmor_bprm_committed_creds
),
1217 LSM_HOOK_INIT(bprm_secureexec
, apparmor_bprm_secureexec
),
1219 LSM_HOOK_INIT(task_setrlimit
, apparmor_task_setrlimit
),
1220 LSM_HOOK_INIT(task_kill
, apparmor_task_kill
),
1224 * AppArmor sysfs module parameters
1227 static int param_set_aabool(const char *val
, const struct kernel_param
*kp
);
1228 static int param_get_aabool(char *buffer
, const struct kernel_param
*kp
);
1229 #define param_check_aabool param_check_bool
1230 static const struct kernel_param_ops param_ops_aabool
= {
1231 .flags
= KERNEL_PARAM_OPS_FL_NOARG
,
1232 .set
= param_set_aabool
,
1233 .get
= param_get_aabool
1236 static int param_set_aauint(const char *val
, const struct kernel_param
*kp
);
1237 static int param_get_aauint(char *buffer
, const struct kernel_param
*kp
);
1238 #define param_check_aauint param_check_uint
1239 static const struct kernel_param_ops param_ops_aauint
= {
1240 .set
= param_set_aauint
,
1241 .get
= param_get_aauint
1244 static int param_set_aalockpolicy(const char *val
, const struct kernel_param
*kp
);
1245 static int param_get_aalockpolicy(char *buffer
, const struct kernel_param
*kp
);
1246 #define param_check_aalockpolicy param_check_bool
1247 static const struct kernel_param_ops param_ops_aalockpolicy
= {
1248 .flags
= KERNEL_PARAM_OPS_FL_NOARG
,
1249 .set
= param_set_aalockpolicy
,
1250 .get
= param_get_aalockpolicy
1253 static int param_set_audit(const char *val
, struct kernel_param
*kp
);
1254 static int param_get_audit(char *buffer
, struct kernel_param
*kp
);
1256 static int param_set_mode(const char *val
, struct kernel_param
*kp
);
1257 static int param_get_mode(char *buffer
, struct kernel_param
*kp
);
1259 /* Flag values, also controllable via /sys/module/apparmor/parameters
1260 * We define special types as we want to do additional mediation.
1263 /* AppArmor global enforcement switch - complain, enforce, kill */
1264 enum profile_mode aa_g_profile_mode
= APPARMOR_ENFORCE
;
1265 module_param_call(mode
, param_set_mode
, param_get_mode
,
1266 &aa_g_profile_mode
, S_IRUGO
| S_IWUSR
);
1268 #ifdef CONFIG_SECURITY_APPARMOR_HASH
1269 /* whether policy verification hashing is enabled */
1270 bool aa_g_hash_policy
= IS_ENABLED(CONFIG_SECURITY_APPARMOR_HASH_DEFAULT
);
1271 module_param_named(hash_policy
, aa_g_hash_policy
, aabool
, S_IRUSR
| S_IWUSR
);
1276 module_param_named(debug
, aa_g_debug
, aabool
, S_IRUGO
| S_IWUSR
);
1279 enum audit_mode aa_g_audit
;
1280 module_param_call(audit
, param_set_audit
, param_get_audit
, &aa_g_audit
,
1283 /* Determines if audit header is included in audited messages. This
1284 * provides more context if the audit daemon is not running
1286 bool aa_g_audit_header
= 1;
1287 module_param_named(audit_header
, aa_g_audit_header
, aabool
, S_IRUGO
| S_IWUSR
);
1289 /* lock out loading/removal of policy
1290 * TODO: add in at boot loading of policy, which is the only way to
1291 * load policy, if lock_policy is set
1293 bool aa_g_lock_policy
;
1294 module_param_named(lock_policy
, aa_g_lock_policy
, aalockpolicy
,
1297 /* Syscall logging mode */
1298 bool aa_g_logsyscall
;
1299 module_param_named(logsyscall
, aa_g_logsyscall
, aabool
, S_IRUGO
| S_IWUSR
);
1301 /* Maximum pathname length before accesses will start getting rejected */
1302 unsigned int aa_g_path_max
= 2 * PATH_MAX
;
1303 module_param_named(path_max
, aa_g_path_max
, aauint
, S_IRUGO
| S_IWUSR
);
1305 /* Determines how paranoid loading of policy is and how much verification
1306 * on the loaded policy is done.
1307 * DEPRECATED: read only as strict checking of load is always done now
1308 * that none root users (user namespaces) can load policy.
1310 bool aa_g_paranoid_load
= 1;
1311 module_param_named(paranoid_load
, aa_g_paranoid_load
, aabool
, S_IRUGO
);
1313 /* Boot time disable flag */
1314 static bool apparmor_enabled
= CONFIG_SECURITY_APPARMOR_BOOTPARAM_VALUE
;
1315 module_param_named(enabled
, apparmor_enabled
, bool, S_IRUGO
);
1317 /* Boot time to set use of default or unconfined as initial profile */
1318 bool aa_g_unconfined_init
= CONFIG_SECURITY_APPARMOR_UNCONFINED_INIT
;
1319 module_param_named(unconfined
, aa_g_unconfined_init
, aabool
, S_IRUGO
);
1322 static int __init
apparmor_enabled_setup(char *str
)
1324 unsigned long enabled
;
1325 int error
= kstrtoul(str
, 0, &enabled
);
1327 apparmor_enabled
= enabled
? 1 : 0;
1331 __setup("apparmor=", apparmor_enabled_setup
);
1333 /* set global flag turning off the ability to load policy */
1334 static int param_set_aalockpolicy(const char *val
, const struct kernel_param
*kp
)
1336 if (!policy_admin_capable())
1338 return param_set_bool(val
, kp
);
1341 static int param_get_aalockpolicy(char *buffer
, const struct kernel_param
*kp
)
1343 if (!policy_admin_capable())
1345 if (!apparmor_enabled
)
1347 return param_get_bool(buffer
, kp
);
1350 static int param_set_aabool(const char *val
, const struct kernel_param
*kp
)
1352 if (!policy_admin_capable())
1354 if (!apparmor_enabled
)
1356 return param_set_bool(val
, kp
);
1359 static int param_get_aabool(char *buffer
, const struct kernel_param
*kp
)
1361 if (!policy_admin_capable())
1363 if (!apparmor_enabled
)
1365 return param_get_bool(buffer
, kp
);
1368 static int param_set_aauint(const char *val
, const struct kernel_param
*kp
)
1370 if (!policy_admin_capable())
1372 if (!apparmor_enabled
)
1374 return param_set_uint(val
, kp
);
1377 static int param_get_aauint(char *buffer
, const struct kernel_param
*kp
)
1379 if (!policy_admin_capable())
1381 if (!apparmor_enabled
)
1383 return param_get_uint(buffer
, kp
);
1386 static int param_get_audit(char *buffer
, struct kernel_param
*kp
)
1388 if (!policy_admin_capable())
1390 if (!apparmor_enabled
)
1392 return sprintf(buffer
, "%s", audit_mode_names
[aa_g_audit
]);
1395 static int param_set_audit(const char *val
, struct kernel_param
*kp
)
1398 if (!policy_admin_capable())
1400 if (!apparmor_enabled
)
1405 for (i
= 0; i
< AUDIT_MAX_INDEX
; i
++) {
1406 if (strcmp(val
, audit_mode_names
[i
]) == 0) {
1415 static int param_get_mode(char *buffer
, struct kernel_param
*kp
)
1417 if (!policy_admin_capable())
1419 if (!apparmor_enabled
)
1422 return sprintf(buffer
, "%s", aa_profile_mode_names
[aa_g_profile_mode
]);
1425 static int param_set_mode(const char *val
, struct kernel_param
*kp
)
1428 if (!policy_admin_capable())
1430 if (!apparmor_enabled
)
1435 for (i
= 0; i
< APPARMOR_MODE_NAMES_MAX_INDEX
; i
++) {
1436 if (strcmp(val
, aa_profile_mode_names
[i
]) == 0) {
1437 aa_g_profile_mode
= i
;
1446 * AppArmor init functions
1450 * set_init_ctx - set a task context and profile on the first task.
1452 static int __init
set_init_ctx(void)
1454 struct cred
*cred
= (struct cred
*)current
->real_cred
;
1455 struct aa_task_ctx
*ctx
;
1457 ctx
= aa_alloc_task_context(GFP_KERNEL
);
1461 if (!aa_g_unconfined_init
) {
1462 ctx
->label
= aa_setup_default_label();
1464 aa_free_task_context(ctx
);
1467 /* fs setup of default is done in aa_create_aafs() */
1469 ctx
->label
= aa_get_label(ns_unconfined(root_ns
));
1470 cred_ctx(cred
) = ctx
;
1475 static void destroy_buffers(void)
1479 for_each_possible_cpu(i
) {
1480 for_each_cpu_buffer(j
) {
1481 kfree(per_cpu(aa_buffers
, i
).buf
[j
]);
1482 per_cpu(aa_buffers
, i
).buf
[j
] = NULL
;
1487 static int __init
alloc_buffers(void)
1491 for_each_possible_cpu(i
) {
1492 for_each_cpu_buffer(j
) {
1494 if (cpu_to_node(i
) > num_online_nodes())
1495 /* fallback to kmalloc for offline nodes */
1496 buffer
= kmalloc(aa_g_path_max
, GFP_KERNEL
);
1498 buffer
= kmalloc_node(aa_g_path_max
, GFP_KERNEL
,
1504 per_cpu(aa_buffers
, i
).buf
[j
] = buffer
;
1511 static int __init
apparmor_init(void)
1515 if (!apparmor_enabled
|| !security_module_enable("apparmor")) {
1516 aa_info_message("AppArmor disabled by boot time parameter");
1517 apparmor_enabled
= 0;
1521 error
= aa_setup_dfa_engine();
1523 AA_ERROR("Unable to setup dfa engine\n");
1527 error
= aa_alloc_root_ns();
1529 AA_ERROR("Unable to allocate default profile namespace\n");
1533 error
= alloc_buffers();
1535 AA_ERROR("Unable to allocate work buffers\n");
1539 error
= set_init_ctx();
1541 AA_ERROR("Failed to set context on init task\n");
1545 security_add_hooks(apparmor_hooks
, ARRAY_SIZE(apparmor_hooks
));
1547 /* Report that AppArmor successfully initialized */
1548 apparmor_initialized
= 1;
1549 if (aa_g_profile_mode
== APPARMOR_COMPLAIN
)
1550 aa_info_message("AppArmor initialized: complain mode enabled");
1551 else if (aa_g_profile_mode
== APPARMOR_KILL
)
1552 aa_info_message("AppArmor initialized: kill mode enabled");
1554 aa_info_message("AppArmor initialized");
1563 aa_teardown_dfa_engine();
1565 apparmor_enabled
= 0;
1569 security_initcall(apparmor_init
);