1 // SPDX-License-Identifier: GPL-2.0-only
3 * AppArmor security module
5 * This file contains AppArmor LSM hooks.
7 * Copyright (C) 1998-2008 Novell/SUSE
8 * Copyright 2009-2010 Canonical Ltd.
11 #include <linux/lsm_hooks.h>
12 #include <linux/moduleparam.h>
14 #include <linux/mman.h>
15 #include <linux/mount.h>
16 #include <linux/namei.h>
17 #include <linux/ptrace.h>
18 #include <linux/ctype.h>
19 #include <linux/sysctl.h>
20 #include <linux/audit.h>
21 #include <linux/user_namespace.h>
22 #include <linux/netfilter_ipv4.h>
23 #include <linux/netfilter_ipv6.h>
24 #include <linux/zlib.h>
26 #include <uapi/linux/mount.h>
28 #include "include/apparmor.h"
29 #include "include/apparmorfs.h"
30 #include "include/audit.h"
31 #include "include/capability.h"
32 #include "include/cred.h"
33 #include "include/file.h"
34 #include "include/ipc.h"
35 #include "include/net.h"
36 #include "include/path.h"
37 #include "include/label.h"
38 #include "include/policy.h"
39 #include "include/policy_ns.h"
40 #include "include/procattr.h"
41 #include "include/mount.h"
42 #include "include/secid.h"
44 /* Flag indicating whether initialization completed */
45 int apparmor_initialized;
48 struct list_head list;
52 #define RESERVE_COUNT 2
53 static int reserve_count = RESERVE_COUNT;
54 static int buffer_count;
56 static LIST_HEAD(aa_global_buffers);
57 static DEFINE_SPINLOCK(aa_buffers_lock);
64 * put the associated labels
66 static void apparmor_cred_free(struct cred *cred)
68 aa_put_label(cred_label(cred));
69 set_cred_label(cred, NULL);
73 * allocate the apparmor part of blank credentials
75 static int apparmor_cred_alloc_blank(struct cred *cred, gfp_t gfp)
77 set_cred_label(cred, NULL);
82 * prepare new cred label for modification by prepare_cred block
84 static int apparmor_cred_prepare(struct cred *new, const struct cred *old,
87 set_cred_label(new, aa_get_newest_label(cred_label(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 set_cred_label(new, aa_get_newest_label(cred_label(old)));
99 static void apparmor_task_free(struct task_struct *task)
102 aa_free_task_ctx(task_ctx(task));
105 static int apparmor_task_alloc(struct task_struct *task,
106 unsigned long clone_flags)
108 struct aa_task_ctx *new = task_ctx(task);
110 aa_dup_task_ctx(new, task_ctx(current));
115 static int apparmor_ptrace_access_check(struct task_struct *child,
118 struct aa_label *tracer, *tracee;
121 tracer = __begin_current_label_crit_section();
122 tracee = aa_get_task_label(child);
123 error = aa_may_ptrace(tracer, tracee,
124 (mode & PTRACE_MODE_READ) ? AA_PTRACE_READ
126 aa_put_label(tracee);
127 __end_current_label_crit_section(tracer);
132 static int apparmor_ptrace_traceme(struct task_struct *parent)
134 struct aa_label *tracer, *tracee;
137 tracee = __begin_current_label_crit_section();
138 tracer = aa_get_task_label(parent);
139 error = aa_may_ptrace(tracer, tracee, AA_PTRACE_TRACE);
140 aa_put_label(tracer);
141 __end_current_label_crit_section(tracee);
146 /* Derived from security/commoncap.c:cap_capget */
147 static int apparmor_capget(struct task_struct *target, kernel_cap_t *effective,
148 kernel_cap_t *inheritable, kernel_cap_t *permitted)
150 struct aa_label *label;
151 const struct cred *cred;
154 cred = __task_cred(target);
155 label = aa_get_newest_cred_label(cred);
158 * cap_capget is stacked ahead of this and will
159 * initialize effective and permitted.
161 if (!unconfined(label)) {
162 struct aa_profile *profile;
165 label_for_each_confined(i, label, profile) {
166 if (COMPLAIN_MODE(profile))
168 *effective = cap_intersect(*effective,
169 profile->caps.allow);
170 *permitted = cap_intersect(*permitted,
171 profile->caps.allow);
180 static int apparmor_capable(const struct cred *cred, struct user_namespace *ns,
181 int cap, unsigned int opts)
183 struct aa_label *label;
186 label = aa_get_newest_cred_label(cred);
187 if (!unconfined(label))
188 error = aa_capable(label, cap, opts);
195 * common_perm - basic common permission check wrapper fn for paths
196 * @op: operation being checked
197 * @path: path to check permission of (NOT NULL)
198 * @mask: requested permissions mask
199 * @cond: conditional info for the permission request (NOT NULL)
201 * Returns: %0 else error code if error or permission denied
203 static int common_perm(const char *op, const struct path *path, u32 mask,
204 struct path_cond *cond)
206 struct aa_label *label;
209 label = __begin_current_label_crit_section();
210 if (!unconfined(label))
211 error = aa_path_perm(op, label, path, 0, mask, cond);
212 __end_current_label_crit_section(label);
218 * common_perm_cond - common permission wrapper around inode cond
219 * @op: operation being checked
220 * @path: location to check (NOT NULL)
221 * @mask: requested permissions mask
223 * Returns: %0 else error code if error or permission denied
225 static int common_perm_cond(const char *op, const struct path *path, u32 mask)
227 struct path_cond cond = { d_backing_inode(path->dentry)->i_uid,
228 d_backing_inode(path->dentry)->i_mode
231 if (!path_mediated_fs(path->dentry))
234 return common_perm(op, path, mask, &cond);
238 * common_perm_dir_dentry - common permission wrapper when path is dir, dentry
239 * @op: operation being checked
240 * @dir: directory of the dentry (NOT NULL)
241 * @dentry: dentry to check (NOT NULL)
242 * @mask: requested permissions mask
243 * @cond: conditional info for the permission request (NOT NULL)
245 * Returns: %0 else error code if error or permission denied
247 static int common_perm_dir_dentry(const char *op, const struct path *dir,
248 struct dentry *dentry, u32 mask,
249 struct path_cond *cond)
251 struct path path = { .mnt = dir->mnt, .dentry = dentry };
253 return common_perm(op, &path, mask, cond);
257 * common_perm_rm - common permission wrapper for operations doing rm
258 * @op: operation being checked
259 * @dir: directory that the dentry is in (NOT NULL)
260 * @dentry: dentry being rm'd (NOT NULL)
261 * @mask: requested permission mask
263 * Returns: %0 else error code if error or permission denied
265 static int common_perm_rm(const char *op, const struct path *dir,
266 struct dentry *dentry, u32 mask)
268 struct inode *inode = d_backing_inode(dentry);
269 struct path_cond cond = { };
271 if (!inode || !path_mediated_fs(dentry))
274 cond.uid = inode->i_uid;
275 cond.mode = inode->i_mode;
277 return common_perm_dir_dentry(op, dir, dentry, mask, &cond);
281 * common_perm_create - common permission wrapper for operations doing create
282 * @op: operation being checked
283 * @dir: directory that dentry will be created in (NOT NULL)
284 * @dentry: dentry to create (NOT NULL)
285 * @mask: request permission mask
286 * @mode: created file mode
288 * Returns: %0 else error code if error or permission denied
290 static int common_perm_create(const char *op, const struct path *dir,
291 struct dentry *dentry, u32 mask, umode_t mode)
293 struct path_cond cond = { current_fsuid(), mode };
295 if (!path_mediated_fs(dir->dentry))
298 return common_perm_dir_dentry(op, dir, dentry, mask, &cond);
301 static int apparmor_path_unlink(const struct path *dir, struct dentry *dentry)
303 return common_perm_rm(OP_UNLINK, dir, dentry, AA_MAY_DELETE);
306 static int apparmor_path_mkdir(const struct path *dir, struct dentry *dentry,
309 return common_perm_create(OP_MKDIR, dir, dentry, AA_MAY_CREATE,
313 static int apparmor_path_rmdir(const struct path *dir, struct dentry *dentry)
315 return common_perm_rm(OP_RMDIR, dir, dentry, AA_MAY_DELETE);
318 static int apparmor_path_mknod(const struct path *dir, struct dentry *dentry,
319 umode_t mode, unsigned int dev)
321 return common_perm_create(OP_MKNOD, dir, dentry, AA_MAY_CREATE, mode);
324 static int apparmor_path_truncate(const struct path *path)
326 return common_perm_cond(OP_TRUNC, path, MAY_WRITE | AA_MAY_SETATTR);
329 static int apparmor_path_symlink(const struct path *dir, struct dentry *dentry,
330 const char *old_name)
332 return common_perm_create(OP_SYMLINK, dir, dentry, AA_MAY_CREATE,
336 static int apparmor_path_link(struct dentry *old_dentry, const struct path *new_dir,
337 struct dentry *new_dentry)
339 struct aa_label *label;
342 if (!path_mediated_fs(old_dentry))
345 label = begin_current_label_crit_section();
346 if (!unconfined(label))
347 error = aa_path_link(label, old_dentry, new_dir, new_dentry);
348 end_current_label_crit_section(label);
353 static int apparmor_path_rename(const struct path *old_dir, struct dentry *old_dentry,
354 const struct path *new_dir, struct dentry *new_dentry)
356 struct aa_label *label;
359 if (!path_mediated_fs(old_dentry))
362 label = begin_current_label_crit_section();
363 if (!unconfined(label)) {
364 struct path old_path = { .mnt = old_dir->mnt,
365 .dentry = old_dentry };
366 struct path new_path = { .mnt = new_dir->mnt,
367 .dentry = new_dentry };
368 struct path_cond cond = { d_backing_inode(old_dentry)->i_uid,
369 d_backing_inode(old_dentry)->i_mode
372 error = aa_path_perm(OP_RENAME_SRC, label, &old_path, 0,
373 MAY_READ | AA_MAY_GETATTR | MAY_WRITE |
374 AA_MAY_SETATTR | AA_MAY_DELETE,
377 error = aa_path_perm(OP_RENAME_DEST, label, &new_path,
378 0, MAY_WRITE | AA_MAY_SETATTR |
379 AA_MAY_CREATE, &cond);
382 end_current_label_crit_section(label);
387 static int apparmor_path_chmod(const struct path *path, umode_t mode)
389 return common_perm_cond(OP_CHMOD, path, AA_MAY_CHMOD);
392 static int apparmor_path_chown(const struct path *path, kuid_t uid, kgid_t gid)
394 return common_perm_cond(OP_CHOWN, path, AA_MAY_CHOWN);
397 static int apparmor_inode_getattr(const struct path *path)
399 return common_perm_cond(OP_GETATTR, path, AA_MAY_GETATTR);
402 static int apparmor_file_open(struct file *file)
404 struct aa_file_ctx *fctx = file_ctx(file);
405 struct aa_label *label;
408 if (!path_mediated_fs(file->f_path.dentry))
411 /* If in exec, permission is handled by bprm hooks.
412 * Cache permissions granted by the previous exec check, with
413 * implicit read and executable mmap which are required to
414 * actually execute the image.
416 if (current->in_execve) {
417 fctx->allow = MAY_EXEC | MAY_READ | AA_EXEC_MMAP;
421 label = aa_get_newest_cred_label(file->f_cred);
422 if (!unconfined(label)) {
423 struct inode *inode = file_inode(file);
424 struct path_cond cond = { inode->i_uid, inode->i_mode };
426 error = aa_path_perm(OP_OPEN, label, &file->f_path, 0,
427 aa_map_file_to_perms(file), &cond);
428 /* todo cache full allowed permissions set and state */
429 fctx->allow = aa_map_file_to_perms(file);
436 static int apparmor_file_alloc_security(struct file *file)
438 struct aa_file_ctx *ctx = file_ctx(file);
439 struct aa_label *label = begin_current_label_crit_section();
441 spin_lock_init(&ctx->lock);
442 rcu_assign_pointer(ctx->label, aa_get_label(label));
443 end_current_label_crit_section(label);
447 static void apparmor_file_free_security(struct file *file)
449 struct aa_file_ctx *ctx = file_ctx(file);
452 aa_put_label(rcu_access_pointer(ctx->label));
455 static int common_file_perm(const char *op, struct file *file, u32 mask,
458 struct aa_label *label;
461 /* don't reaudit files closed during inheritance */
462 if (file->f_path.dentry == aa_null.dentry)
465 label = __begin_current_label_crit_section();
466 error = aa_file_perm(op, label, file, mask, in_atomic);
467 __end_current_label_crit_section(label);
472 static int apparmor_file_receive(struct file *file)
474 return common_file_perm(OP_FRECEIVE, file, aa_map_file_to_perms(file),
478 static int apparmor_file_permission(struct file *file, int mask)
480 return common_file_perm(OP_FPERM, file, mask, false);
483 static int apparmor_file_lock(struct file *file, unsigned int cmd)
485 u32 mask = AA_MAY_LOCK;
490 return common_file_perm(OP_FLOCK, file, mask, false);
493 static int common_mmap(const char *op, struct file *file, unsigned long prot,
494 unsigned long flags, bool in_atomic)
498 if (!file || !file_ctx(file))
501 if (prot & PROT_READ)
504 * Private mappings don't require write perms since they don't
505 * write back to the files
507 if ((prot & PROT_WRITE) && !(flags & MAP_PRIVATE))
509 if (prot & PROT_EXEC)
510 mask |= AA_EXEC_MMAP;
512 return common_file_perm(op, file, mask, in_atomic);
515 static int apparmor_mmap_file(struct file *file, unsigned long reqprot,
516 unsigned long prot, unsigned long flags)
518 return common_mmap(OP_FMMAP, file, prot, flags, GFP_ATOMIC);
521 static int apparmor_file_mprotect(struct vm_area_struct *vma,
522 unsigned long reqprot, unsigned long prot)
524 return common_mmap(OP_FMPROT, vma->vm_file, prot,
525 !(vma->vm_flags & VM_SHARED) ? MAP_PRIVATE : 0,
529 static int apparmor_sb_mount(const char *dev_name, const struct path *path,
530 const char *type, unsigned long flags, void *data)
532 struct aa_label *label;
536 if ((flags & MS_MGC_MSK) == MS_MGC_VAL)
537 flags &= ~MS_MGC_MSK;
539 flags &= ~AA_MS_IGNORE_MASK;
541 label = __begin_current_label_crit_section();
542 if (!unconfined(label)) {
543 if (flags & MS_REMOUNT)
544 error = aa_remount(label, path, flags, data);
545 else if (flags & MS_BIND)
546 error = aa_bind_mount(label, path, dev_name, flags);
547 else if (flags & (MS_SHARED | MS_PRIVATE | MS_SLAVE |
549 error = aa_mount_change_type(label, path, flags);
550 else if (flags & MS_MOVE)
551 error = aa_move_mount(label, path, dev_name);
553 error = aa_new_mount(label, dev_name, path, type,
556 __end_current_label_crit_section(label);
561 static int apparmor_sb_umount(struct vfsmount *mnt, int flags)
563 struct aa_label *label;
566 label = __begin_current_label_crit_section();
567 if (!unconfined(label))
568 error = aa_umount(label, mnt, flags);
569 __end_current_label_crit_section(label);
574 static int apparmor_sb_pivotroot(const struct path *old_path,
575 const struct path *new_path)
577 struct aa_label *label;
580 label = aa_get_current_label();
581 if (!unconfined(label))
582 error = aa_pivotroot(label, old_path, new_path);
588 static int apparmor_getprocattr(struct task_struct *task, char *name,
593 const struct cred *cred = get_task_cred(task);
594 struct aa_task_ctx *ctx = task_ctx(current);
595 struct aa_label *label = NULL;
597 if (strcmp(name, "current") == 0)
598 label = aa_get_newest_label(cred_label(cred));
599 else if (strcmp(name, "prev") == 0 && ctx->previous)
600 label = aa_get_newest_label(ctx->previous);
601 else if (strcmp(name, "exec") == 0 && ctx->onexec)
602 label = aa_get_newest_label(ctx->onexec);
607 error = aa_getprocattr(label, value);
615 static int apparmor_setprocattr(const char *name, void *value,
618 char *command, *largs = NULL, *args = value;
621 DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, OP_SETPROCATTR);
626 /* AppArmor requires that the buffer must be null terminated atm */
627 if (args[size - 1] != '\0') {
629 largs = args = kmalloc(size + 1, GFP_KERNEL);
632 memcpy(args, value, size);
638 command = strsep(&args, " ");
641 args = skip_spaces(args);
645 arg_size = size - (args - (largs ? largs : (char *) value));
646 if (strcmp(name, "current") == 0) {
647 if (strcmp(command, "changehat") == 0) {
648 error = aa_setprocattr_changehat(args, arg_size,
650 } else if (strcmp(command, "permhat") == 0) {
651 error = aa_setprocattr_changehat(args, arg_size,
653 } else if (strcmp(command, "changeprofile") == 0) {
654 error = aa_change_profile(args, AA_CHANGE_NOFLAGS);
655 } else if (strcmp(command, "permprofile") == 0) {
656 error = aa_change_profile(args, AA_CHANGE_TEST);
657 } else if (strcmp(command, "stack") == 0) {
658 error = aa_change_profile(args, AA_CHANGE_STACK);
661 } else if (strcmp(name, "exec") == 0) {
662 if (strcmp(command, "exec") == 0)
663 error = aa_change_profile(args, AA_CHANGE_ONEXEC);
664 else if (strcmp(command, "stack") == 0)
665 error = aa_change_profile(args, (AA_CHANGE_ONEXEC |
670 /* only support the "current" and "exec" process attributes */
680 aad(&sa)->label = begin_current_label_crit_section();
681 aad(&sa)->info = name;
682 aad(&sa)->error = error = -EINVAL;
683 aa_audit_msg(AUDIT_APPARMOR_DENIED, &sa, NULL);
684 end_current_label_crit_section(aad(&sa)->label);
689 * apparmor_bprm_committing_creds - do task cleanup on committing new creds
690 * @bprm: binprm for the exec (NOT NULL)
692 static void apparmor_bprm_committing_creds(struct linux_binprm *bprm)
694 struct aa_label *label = aa_current_raw_label();
695 struct aa_label *new_label = cred_label(bprm->cred);
697 /* bail out if unconfined or not changing profile */
698 if ((new_label->proxy == label->proxy) ||
699 (unconfined(new_label)))
702 aa_inherit_files(bprm->cred, current->files);
704 current->pdeath_signal = 0;
706 /* reset soft limits and set hard limits for the new label */
707 __aa_transition_rlimits(label, new_label);
711 * apparmor_bprm_committed_cred - do cleanup after new creds committed
712 * @bprm: binprm for the exec (NOT NULL)
714 static void apparmor_bprm_committed_creds(struct linux_binprm *bprm)
716 /* clear out temporary/transitional state from the context */
717 aa_clear_task_ctx_trans(task_ctx(current));
722 static void apparmor_task_getsecid(struct task_struct *p, u32 *secid)
724 struct aa_label *label = aa_get_task_label(p);
725 *secid = label->secid;
729 static int apparmor_task_setrlimit(struct task_struct *task,
730 unsigned int resource, struct rlimit *new_rlim)
732 struct aa_label *label = __begin_current_label_crit_section();
735 if (!unconfined(label))
736 error = aa_task_setrlimit(label, task, resource, new_rlim);
737 __end_current_label_crit_section(label);
742 static int apparmor_task_kill(struct task_struct *target, struct kernel_siginfo *info,
743 int sig, const struct cred *cred)
745 struct aa_label *cl, *tl;
750 * Dealing with USB IO specific behavior
752 cl = aa_get_newest_cred_label(cred);
753 tl = aa_get_task_label(target);
754 error = aa_may_signal(cl, tl, sig);
760 cl = __begin_current_label_crit_section();
761 tl = aa_get_task_label(target);
762 error = aa_may_signal(cl, tl, sig);
764 __end_current_label_crit_section(cl);
770 * apparmor_sk_alloc_security - allocate and attach the sk_security field
772 static int apparmor_sk_alloc_security(struct sock *sk, int family, gfp_t flags)
774 struct aa_sk_ctx *ctx;
776 ctx = kzalloc(sizeof(*ctx), flags);
786 * apparmor_sk_free_security - free the sk_security field
788 static void apparmor_sk_free_security(struct sock *sk)
790 struct aa_sk_ctx *ctx = SK_CTX(sk);
793 aa_put_label(ctx->label);
794 aa_put_label(ctx->peer);
799 * apparmor_clone_security - clone the sk_security field
801 static void apparmor_sk_clone_security(const struct sock *sk,
804 struct aa_sk_ctx *ctx = SK_CTX(sk);
805 struct aa_sk_ctx *new = SK_CTX(newsk);
808 aa_put_label(new->label);
809 new->label = aa_get_label(ctx->label);
812 aa_put_label(new->peer);
813 new->peer = aa_get_label(ctx->peer);
817 * apparmor_socket_create - check perms before creating a new socket
819 static int apparmor_socket_create(int family, int type, int protocol, int kern)
821 struct aa_label *label;
824 AA_BUG(in_interrupt());
826 label = begin_current_label_crit_section();
827 if (!(kern || unconfined(label)))
828 error = af_select(family,
829 create_perm(label, family, type, protocol),
830 aa_af_perm(label, OP_CREATE, AA_MAY_CREATE,
831 family, type, protocol));
832 end_current_label_crit_section(label);
838 * apparmor_socket_post_create - setup the per-socket security struct
841 * - kernel sockets currently labeled unconfined but we may want to
842 * move to a special kernel label
843 * - socket may not have sk here if created with sock_create_lite or
844 * sock_alloc. These should be accept cases which will be handled in
847 static int apparmor_socket_post_create(struct socket *sock, int family,
848 int type, int protocol, int kern)
850 struct aa_label *label;
853 struct aa_ns *ns = aa_get_current_ns();
855 label = aa_get_label(ns_unconfined(ns));
858 label = aa_get_current_label();
861 struct aa_sk_ctx *ctx = SK_CTX(sock->sk);
863 aa_put_label(ctx->label);
864 ctx->label = aa_get_label(label);
872 * apparmor_socket_bind - check perms before bind addr to socket
874 static int apparmor_socket_bind(struct socket *sock,
875 struct sockaddr *address, int addrlen)
880 AA_BUG(in_interrupt());
882 return af_select(sock->sk->sk_family,
883 bind_perm(sock, address, addrlen),
884 aa_sk_perm(OP_BIND, AA_MAY_BIND, sock->sk));
888 * apparmor_socket_connect - check perms before connecting @sock to @address
890 static int apparmor_socket_connect(struct socket *sock,
891 struct sockaddr *address, int addrlen)
896 AA_BUG(in_interrupt());
898 return af_select(sock->sk->sk_family,
899 connect_perm(sock, address, addrlen),
900 aa_sk_perm(OP_CONNECT, AA_MAY_CONNECT, sock->sk));
904 * apparmor_socket_list - check perms before allowing listen
906 static int apparmor_socket_listen(struct socket *sock, int backlog)
910 AA_BUG(in_interrupt());
912 return af_select(sock->sk->sk_family,
913 listen_perm(sock, backlog),
914 aa_sk_perm(OP_LISTEN, AA_MAY_LISTEN, sock->sk));
918 * apparmor_socket_accept - check perms before accepting a new connection.
920 * Note: while @newsock is created and has some information, the accept
923 static int apparmor_socket_accept(struct socket *sock, struct socket *newsock)
928 AA_BUG(in_interrupt());
930 return af_select(sock->sk->sk_family,
931 accept_perm(sock, newsock),
932 aa_sk_perm(OP_ACCEPT, AA_MAY_ACCEPT, sock->sk));
935 static int aa_sock_msg_perm(const char *op, u32 request, struct socket *sock,
936 struct msghdr *msg, int size)
941 AA_BUG(in_interrupt());
943 return af_select(sock->sk->sk_family,
944 msg_perm(op, request, sock, msg, size),
945 aa_sk_perm(op, request, sock->sk));
949 * apparmor_socket_sendmsg - check perms before sending msg to another socket
951 static int apparmor_socket_sendmsg(struct socket *sock,
952 struct msghdr *msg, int size)
954 return aa_sock_msg_perm(OP_SENDMSG, AA_MAY_SEND, sock, msg, size);
958 * apparmor_socket_recvmsg - check perms before receiving a message
960 static int apparmor_socket_recvmsg(struct socket *sock,
961 struct msghdr *msg, int size, int flags)
963 return aa_sock_msg_perm(OP_RECVMSG, AA_MAY_RECEIVE, sock, msg, size);
966 /* revaliation, get/set attr, shutdown */
967 static int aa_sock_perm(const char *op, u32 request, struct socket *sock)
971 AA_BUG(in_interrupt());
973 return af_select(sock->sk->sk_family,
974 sock_perm(op, request, sock),
975 aa_sk_perm(op, request, sock->sk));
979 * apparmor_socket_getsockname - check perms before getting the local address
981 static int apparmor_socket_getsockname(struct socket *sock)
983 return aa_sock_perm(OP_GETSOCKNAME, AA_MAY_GETATTR, sock);
987 * apparmor_socket_getpeername - check perms before getting remote address
989 static int apparmor_socket_getpeername(struct socket *sock)
991 return aa_sock_perm(OP_GETPEERNAME, AA_MAY_GETATTR, sock);
994 /* revaliation, get/set attr, opt */
995 static int aa_sock_opt_perm(const char *op, u32 request, struct socket *sock,
996 int level, int optname)
1000 AA_BUG(in_interrupt());
1002 return af_select(sock->sk->sk_family,
1003 opt_perm(op, request, sock, level, optname),
1004 aa_sk_perm(op, request, sock->sk));
1008 * apparmor_getsockopt - check perms before getting socket options
1010 static int apparmor_socket_getsockopt(struct socket *sock, int level,
1013 return aa_sock_opt_perm(OP_GETSOCKOPT, AA_MAY_GETOPT, sock,
1018 * apparmor_setsockopt - check perms before setting socket options
1020 static int apparmor_socket_setsockopt(struct socket *sock, int level,
1023 return aa_sock_opt_perm(OP_SETSOCKOPT, AA_MAY_SETOPT, sock,
1028 * apparmor_socket_shutdown - check perms before shutting down @sock conn
1030 static int apparmor_socket_shutdown(struct socket *sock, int how)
1032 return aa_sock_perm(OP_SHUTDOWN, AA_MAY_SHUTDOWN, sock);
1035 #ifdef CONFIG_NETWORK_SECMARK
1037 * apparmor_socket_sock_recv_skb - check perms before associating skb to sk
1039 * Note: can not sleep may be called with locks held
1041 * dont want protocol specific in __skb_recv_datagram()
1042 * to deny an incoming connection socket_sock_rcv_skb()
1044 static int apparmor_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
1046 struct aa_sk_ctx *ctx = SK_CTX(sk);
1051 return apparmor_secmark_check(ctx->label, OP_RECVMSG, AA_MAY_RECEIVE,
1057 static struct aa_label *sk_peer_label(struct sock *sk)
1059 struct aa_sk_ctx *ctx = SK_CTX(sk);
1064 return ERR_PTR(-ENOPROTOOPT);
1068 * apparmor_socket_getpeersec_stream - get security context of peer
1070 * Note: for tcp only valid if using ipsec or cipso on lan
1072 static int apparmor_socket_getpeersec_stream(struct socket *sock,
1073 sockptr_t optval, sockptr_t optlen,
1077 int slen, error = 0;
1078 struct aa_label *label;
1079 struct aa_label *peer;
1081 label = begin_current_label_crit_section();
1082 peer = sk_peer_label(sock->sk);
1084 error = PTR_ERR(peer);
1087 slen = aa_label_asxprint(&name, labels_ns(label), peer,
1088 FLAG_SHOW_MODE | FLAG_VIEW_SUBNS |
1089 FLAG_HIDDEN_UNCONFINED, GFP_KERNEL);
1090 /* don't include terminating \0 in slen, it breaks some apps */
1100 if (copy_to_sockptr(optval, name, slen))
1103 if (copy_to_sockptr(optlen, &slen, sizeof(slen)))
1106 end_current_label_crit_section(label);
1112 * apparmor_socket_getpeersec_dgram - get security label of packet
1113 * @sock: the peer socket
1115 * @secid: pointer to where to put the secid of the packet
1117 * Sets the netlabel socket state on sk from parent
1119 static int apparmor_socket_getpeersec_dgram(struct socket *sock,
1120 struct sk_buff *skb, u32 *secid)
1123 /* TODO: requires secid support */
1124 return -ENOPROTOOPT;
1128 * apparmor_sock_graft - Initialize newly created socket
1130 * @parent: parent socket
1132 * Note: could set off of SOCK_CTX(parent) but need to track inode and we can
1133 * just set sk security information off of current creating process label
1134 * Labeling of sk for accept case - probably should be sock based
1135 * instead of task, because of the case where an implicitly labeled
1136 * socket is shared by different tasks.
1138 static void apparmor_sock_graft(struct sock *sk, struct socket *parent)
1140 struct aa_sk_ctx *ctx = SK_CTX(sk);
1143 ctx->label = aa_get_current_label();
1146 #ifdef CONFIG_NETWORK_SECMARK
1147 static int apparmor_inet_conn_request(struct sock *sk, struct sk_buff *skb,
1148 struct request_sock *req)
1150 struct aa_sk_ctx *ctx = SK_CTX(sk);
1155 return apparmor_secmark_check(ctx->label, OP_CONNECT, AA_MAY_CONNECT,
1161 * The cred blob is a pointer to, not an instance of, an aa_label.
1163 struct lsm_blob_sizes apparmor_blob_sizes __lsm_ro_after_init = {
1164 .lbs_cred = sizeof(struct aa_label *),
1165 .lbs_file = sizeof(struct aa_file_ctx),
1166 .lbs_task = sizeof(struct aa_task_ctx),
1169 static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = {
1170 LSM_HOOK_INIT(ptrace_access_check, apparmor_ptrace_access_check),
1171 LSM_HOOK_INIT(ptrace_traceme, apparmor_ptrace_traceme),
1172 LSM_HOOK_INIT(capget, apparmor_capget),
1173 LSM_HOOK_INIT(capable, apparmor_capable),
1175 LSM_HOOK_INIT(sb_mount, apparmor_sb_mount),
1176 LSM_HOOK_INIT(sb_umount, apparmor_sb_umount),
1177 LSM_HOOK_INIT(sb_pivotroot, apparmor_sb_pivotroot),
1179 LSM_HOOK_INIT(path_link, apparmor_path_link),
1180 LSM_HOOK_INIT(path_unlink, apparmor_path_unlink),
1181 LSM_HOOK_INIT(path_symlink, apparmor_path_symlink),
1182 LSM_HOOK_INIT(path_mkdir, apparmor_path_mkdir),
1183 LSM_HOOK_INIT(path_rmdir, apparmor_path_rmdir),
1184 LSM_HOOK_INIT(path_mknod, apparmor_path_mknod),
1185 LSM_HOOK_INIT(path_rename, apparmor_path_rename),
1186 LSM_HOOK_INIT(path_chmod, apparmor_path_chmod),
1187 LSM_HOOK_INIT(path_chown, apparmor_path_chown),
1188 LSM_HOOK_INIT(path_truncate, apparmor_path_truncate),
1189 LSM_HOOK_INIT(inode_getattr, apparmor_inode_getattr),
1191 LSM_HOOK_INIT(file_open, apparmor_file_open),
1192 LSM_HOOK_INIT(file_receive, apparmor_file_receive),
1193 LSM_HOOK_INIT(file_permission, apparmor_file_permission),
1194 LSM_HOOK_INIT(file_alloc_security, apparmor_file_alloc_security),
1195 LSM_HOOK_INIT(file_free_security, apparmor_file_free_security),
1196 LSM_HOOK_INIT(mmap_file, apparmor_mmap_file),
1197 LSM_HOOK_INIT(file_mprotect, apparmor_file_mprotect),
1198 LSM_HOOK_INIT(file_lock, apparmor_file_lock),
1200 LSM_HOOK_INIT(getprocattr, apparmor_getprocattr),
1201 LSM_HOOK_INIT(setprocattr, apparmor_setprocattr),
1203 LSM_HOOK_INIT(sk_alloc_security, apparmor_sk_alloc_security),
1204 LSM_HOOK_INIT(sk_free_security, apparmor_sk_free_security),
1205 LSM_HOOK_INIT(sk_clone_security, apparmor_sk_clone_security),
1207 LSM_HOOK_INIT(socket_create, apparmor_socket_create),
1208 LSM_HOOK_INIT(socket_post_create, apparmor_socket_post_create),
1209 LSM_HOOK_INIT(socket_bind, apparmor_socket_bind),
1210 LSM_HOOK_INIT(socket_connect, apparmor_socket_connect),
1211 LSM_HOOK_INIT(socket_listen, apparmor_socket_listen),
1212 LSM_HOOK_INIT(socket_accept, apparmor_socket_accept),
1213 LSM_HOOK_INIT(socket_sendmsg, apparmor_socket_sendmsg),
1214 LSM_HOOK_INIT(socket_recvmsg, apparmor_socket_recvmsg),
1215 LSM_HOOK_INIT(socket_getsockname, apparmor_socket_getsockname),
1216 LSM_HOOK_INIT(socket_getpeername, apparmor_socket_getpeername),
1217 LSM_HOOK_INIT(socket_getsockopt, apparmor_socket_getsockopt),
1218 LSM_HOOK_INIT(socket_setsockopt, apparmor_socket_setsockopt),
1219 LSM_HOOK_INIT(socket_shutdown, apparmor_socket_shutdown),
1220 #ifdef CONFIG_NETWORK_SECMARK
1221 LSM_HOOK_INIT(socket_sock_rcv_skb, apparmor_socket_sock_rcv_skb),
1223 LSM_HOOK_INIT(socket_getpeersec_stream,
1224 apparmor_socket_getpeersec_stream),
1225 LSM_HOOK_INIT(socket_getpeersec_dgram,
1226 apparmor_socket_getpeersec_dgram),
1227 LSM_HOOK_INIT(sock_graft, apparmor_sock_graft),
1228 #ifdef CONFIG_NETWORK_SECMARK
1229 LSM_HOOK_INIT(inet_conn_request, apparmor_inet_conn_request),
1232 LSM_HOOK_INIT(cred_alloc_blank, apparmor_cred_alloc_blank),
1233 LSM_HOOK_INIT(cred_free, apparmor_cred_free),
1234 LSM_HOOK_INIT(cred_prepare, apparmor_cred_prepare),
1235 LSM_HOOK_INIT(cred_transfer, apparmor_cred_transfer),
1237 LSM_HOOK_INIT(bprm_creds_for_exec, apparmor_bprm_creds_for_exec),
1238 LSM_HOOK_INIT(bprm_committing_creds, apparmor_bprm_committing_creds),
1239 LSM_HOOK_INIT(bprm_committed_creds, apparmor_bprm_committed_creds),
1241 LSM_HOOK_INIT(task_free, apparmor_task_free),
1242 LSM_HOOK_INIT(task_alloc, apparmor_task_alloc),
1243 LSM_HOOK_INIT(task_getsecid, apparmor_task_getsecid),
1244 LSM_HOOK_INIT(task_setrlimit, apparmor_task_setrlimit),
1245 LSM_HOOK_INIT(task_kill, apparmor_task_kill),
1248 LSM_HOOK_INIT(audit_rule_init, aa_audit_rule_init),
1249 LSM_HOOK_INIT(audit_rule_known, aa_audit_rule_known),
1250 LSM_HOOK_INIT(audit_rule_match, aa_audit_rule_match),
1251 LSM_HOOK_INIT(audit_rule_free, aa_audit_rule_free),
1254 LSM_HOOK_INIT(secid_to_secctx, apparmor_secid_to_secctx),
1255 LSM_HOOK_INIT(secctx_to_secid, apparmor_secctx_to_secid),
1256 LSM_HOOK_INIT(release_secctx, apparmor_release_secctx),
1260 * AppArmor sysfs module parameters
1263 static int param_set_aabool(const char *val, const struct kernel_param *kp);
1264 static int param_get_aabool(char *buffer, const struct kernel_param *kp);
1265 #define param_check_aabool param_check_bool
1266 static const struct kernel_param_ops param_ops_aabool = {
1267 .flags = KERNEL_PARAM_OPS_FL_NOARG,
1268 .set = param_set_aabool,
1269 .get = param_get_aabool
1272 static int param_set_aauint(const char *val, const struct kernel_param *kp);
1273 static int param_get_aauint(char *buffer, const struct kernel_param *kp);
1274 #define param_check_aauint param_check_uint
1275 static const struct kernel_param_ops param_ops_aauint = {
1276 .set = param_set_aauint,
1277 .get = param_get_aauint
1280 static int param_set_aacompressionlevel(const char *val,
1281 const struct kernel_param *kp);
1282 static int param_get_aacompressionlevel(char *buffer,
1283 const struct kernel_param *kp);
1284 #define param_check_aacompressionlevel param_check_int
1285 static const struct kernel_param_ops param_ops_aacompressionlevel = {
1286 .set = param_set_aacompressionlevel,
1287 .get = param_get_aacompressionlevel
1290 static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp);
1291 static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp);
1292 #define param_check_aalockpolicy param_check_bool
1293 static const struct kernel_param_ops param_ops_aalockpolicy = {
1294 .flags = KERNEL_PARAM_OPS_FL_NOARG,
1295 .set = param_set_aalockpolicy,
1296 .get = param_get_aalockpolicy
1299 static int param_set_audit(const char *val, const struct kernel_param *kp);
1300 static int param_get_audit(char *buffer, const struct kernel_param *kp);
1302 static int param_set_mode(const char *val, const struct kernel_param *kp);
1303 static int param_get_mode(char *buffer, const struct kernel_param *kp);
1305 /* Flag values, also controllable via /sys/module/apparmor/parameters
1306 * We define special types as we want to do additional mediation.
1309 /* AppArmor global enforcement switch - complain, enforce, kill */
1310 enum profile_mode aa_g_profile_mode = APPARMOR_ENFORCE;
1311 module_param_call(mode, param_set_mode, param_get_mode,
1312 &aa_g_profile_mode, S_IRUSR | S_IWUSR);
1314 /* whether policy verification hashing is enabled */
1315 bool aa_g_hash_policy = IS_ENABLED(CONFIG_SECURITY_APPARMOR_HASH_DEFAULT);
1316 #ifdef CONFIG_SECURITY_APPARMOR_HASH
1317 module_param_named(hash_policy, aa_g_hash_policy, aabool, S_IRUSR | S_IWUSR);
1320 /* policy loaddata compression level */
1321 int aa_g_rawdata_compression_level = Z_DEFAULT_COMPRESSION;
1322 module_param_named(rawdata_compression_level, aa_g_rawdata_compression_level,
1323 aacompressionlevel, 0400);
1326 bool aa_g_debug = IS_ENABLED(CONFIG_SECURITY_APPARMOR_DEBUG_MESSAGES);
1327 module_param_named(debug, aa_g_debug, aabool, S_IRUSR | S_IWUSR);
1330 enum audit_mode aa_g_audit;
1331 module_param_call(audit, param_set_audit, param_get_audit,
1332 &aa_g_audit, S_IRUSR | S_IWUSR);
1334 /* Determines if audit header is included in audited messages. This
1335 * provides more context if the audit daemon is not running
1337 bool aa_g_audit_header = true;
1338 module_param_named(audit_header, aa_g_audit_header, aabool,
1341 /* lock out loading/removal of policy
1342 * TODO: add in at boot loading of policy, which is the only way to
1343 * load policy, if lock_policy is set
1345 bool aa_g_lock_policy;
1346 module_param_named(lock_policy, aa_g_lock_policy, aalockpolicy,
1349 /* Syscall logging mode */
1350 bool aa_g_logsyscall;
1351 module_param_named(logsyscall, aa_g_logsyscall, aabool, S_IRUSR | S_IWUSR);
1353 /* Maximum pathname length before accesses will start getting rejected */
1354 unsigned int aa_g_path_max = 2 * PATH_MAX;
1355 module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR);
1357 /* Determines how paranoid loading of policy is and how much verification
1358 * on the loaded policy is done.
1359 * DEPRECATED: read only as strict checking of load is always done now
1360 * that none root users (user namespaces) can load policy.
1362 bool aa_g_paranoid_load = true;
1363 module_param_named(paranoid_load, aa_g_paranoid_load, aabool, S_IRUGO);
1365 static int param_get_aaintbool(char *buffer, const struct kernel_param *kp);
1366 static int param_set_aaintbool(const char *val, const struct kernel_param *kp);
1367 #define param_check_aaintbool param_check_int
1368 static const struct kernel_param_ops param_ops_aaintbool = {
1369 .set = param_set_aaintbool,
1370 .get = param_get_aaintbool
1372 /* Boot time disable flag */
1373 static int apparmor_enabled __lsm_ro_after_init = 1;
1374 module_param_named(enabled, apparmor_enabled, aaintbool, 0444);
1376 static int __init apparmor_enabled_setup(char *str)
1378 unsigned long enabled;
1379 int error = kstrtoul(str, 0, &enabled);
1381 apparmor_enabled = enabled ? 1 : 0;
1385 __setup("apparmor=", apparmor_enabled_setup);
1387 /* set global flag turning off the ability to load policy */
1388 static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp)
1390 if (!apparmor_enabled)
1392 if (apparmor_initialized && !policy_admin_capable(NULL))
1394 return param_set_bool(val, kp);
1397 static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp)
1399 if (!apparmor_enabled)
1401 if (apparmor_initialized && !policy_view_capable(NULL))
1403 return param_get_bool(buffer, kp);
1406 static int param_set_aabool(const char *val, const struct kernel_param *kp)
1408 if (!apparmor_enabled)
1410 if (apparmor_initialized && !policy_admin_capable(NULL))
1412 return param_set_bool(val, kp);
1415 static int param_get_aabool(char *buffer, const struct kernel_param *kp)
1417 if (!apparmor_enabled)
1419 if (apparmor_initialized && !policy_view_capable(NULL))
1421 return param_get_bool(buffer, kp);
1424 static int param_set_aauint(const char *val, const struct kernel_param *kp)
1428 if (!apparmor_enabled)
1430 /* file is ro but enforce 2nd line check */
1431 if (apparmor_initialized)
1434 error = param_set_uint(val, kp);
1435 aa_g_path_max = max_t(uint32_t, aa_g_path_max, sizeof(union aa_buffer));
1436 pr_info("AppArmor: buffer size set to %d bytes\n", aa_g_path_max);
1441 static int param_get_aauint(char *buffer, const struct kernel_param *kp)
1443 if (!apparmor_enabled)
1445 if (apparmor_initialized && !policy_view_capable(NULL))
1447 return param_get_uint(buffer, kp);
1450 /* Can only be set before AppArmor is initialized (i.e. on boot cmdline). */
1451 static int param_set_aaintbool(const char *val, const struct kernel_param *kp)
1453 struct kernel_param kp_local;
1457 if (apparmor_initialized)
1460 /* Create local copy, with arg pointing to bool type. */
1461 value = !!*((int *)kp->arg);
1462 memcpy(&kp_local, kp, sizeof(kp_local));
1463 kp_local.arg = &value;
1465 error = param_set_bool(val, &kp_local);
1467 *((int *)kp->arg) = *((bool *)kp_local.arg);
1472 * To avoid changing /sys/module/apparmor/parameters/enabled from Y/N to
1473 * 1/0, this converts the "int that is actually bool" back to bool for
1474 * display in the /sys filesystem, while keeping it "int" for the LSM
1477 static int param_get_aaintbool(char *buffer, const struct kernel_param *kp)
1479 struct kernel_param kp_local;
1482 /* Create local copy, with arg pointing to bool type. */
1483 value = !!*((int *)kp->arg);
1484 memcpy(&kp_local, kp, sizeof(kp_local));
1485 kp_local.arg = &value;
1487 return param_get_bool(buffer, &kp_local);
1490 static int param_set_aacompressionlevel(const char *val,
1491 const struct kernel_param *kp)
1495 if (!apparmor_enabled)
1497 if (apparmor_initialized)
1500 error = param_set_int(val, kp);
1502 aa_g_rawdata_compression_level = clamp(aa_g_rawdata_compression_level,
1504 Z_BEST_COMPRESSION);
1505 pr_info("AppArmor: policy rawdata compression level set to %u\n",
1506 aa_g_rawdata_compression_level);
1511 static int param_get_aacompressionlevel(char *buffer,
1512 const struct kernel_param *kp)
1514 if (!apparmor_enabled)
1516 if (apparmor_initialized && !policy_view_capable(NULL))
1518 return param_get_int(buffer, kp);
1521 static int param_get_audit(char *buffer, const struct kernel_param *kp)
1523 if (!apparmor_enabled)
1525 if (apparmor_initialized && !policy_view_capable(NULL))
1527 return sprintf(buffer, "%s", audit_mode_names[aa_g_audit]);
1530 static int param_set_audit(const char *val, const struct kernel_param *kp)
1534 if (!apparmor_enabled)
1538 if (apparmor_initialized && !policy_admin_capable(NULL))
1541 i = match_string(audit_mode_names, AUDIT_MAX_INDEX, val);
1549 static int param_get_mode(char *buffer, const struct kernel_param *kp)
1551 if (!apparmor_enabled)
1553 if (apparmor_initialized && !policy_view_capable(NULL))
1556 return sprintf(buffer, "%s", aa_profile_mode_names[aa_g_profile_mode]);
1559 static int param_set_mode(const char *val, const struct kernel_param *kp)
1563 if (!apparmor_enabled)
1567 if (apparmor_initialized && !policy_admin_capable(NULL))
1570 i = match_string(aa_profile_mode_names, APPARMOR_MODE_NAMES_MAX_INDEX,
1575 aa_g_profile_mode = i;
1579 char *aa_get_buffer(bool in_atomic)
1581 union aa_buffer *aa_buf;
1582 bool try_again = true;
1583 gfp_t flags = (GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOWARN);
1586 spin_lock(&aa_buffers_lock);
1587 if (buffer_count > reserve_count ||
1588 (in_atomic && !list_empty(&aa_global_buffers))) {
1589 aa_buf = list_first_entry(&aa_global_buffers, union aa_buffer,
1591 list_del(&aa_buf->list);
1593 spin_unlock(&aa_buffers_lock);
1594 return &aa_buf->buffer[0];
1598 * out of reserve buffers and in atomic context so increase
1599 * how many buffers to keep in reserve
1604 spin_unlock(&aa_buffers_lock);
1608 aa_buf = kmalloc(aa_g_path_max, flags);
1614 pr_warn_once("AppArmor: Failed to allocate a memory buffer.\n");
1617 return &aa_buf->buffer[0];
1620 void aa_put_buffer(char *buf)
1622 union aa_buffer *aa_buf;
1626 aa_buf = container_of(buf, union aa_buffer, buffer[0]);
1628 spin_lock(&aa_buffers_lock);
1629 list_add(&aa_buf->list, &aa_global_buffers);
1631 spin_unlock(&aa_buffers_lock);
1635 * AppArmor init functions
1639 * set_init_ctx - set a task context and profile on the first task.
1641 * TODO: allow setting an alternate profile than unconfined
1643 static int __init set_init_ctx(void)
1645 struct cred *cred = (__force struct cred *)current->real_cred;
1647 set_cred_label(cred, aa_get_label(ns_unconfined(root_ns)));
1652 static void destroy_buffers(void)
1654 union aa_buffer *aa_buf;
1656 spin_lock(&aa_buffers_lock);
1657 while (!list_empty(&aa_global_buffers)) {
1658 aa_buf = list_first_entry(&aa_global_buffers, union aa_buffer,
1660 list_del(&aa_buf->list);
1661 spin_unlock(&aa_buffers_lock);
1663 spin_lock(&aa_buffers_lock);
1665 spin_unlock(&aa_buffers_lock);
1668 static int __init alloc_buffers(void)
1670 union aa_buffer *aa_buf;
1674 * A function may require two buffers at once. Usually the buffers are
1675 * used for a short period of time and are shared. On UP kernel buffers
1676 * two should be enough, with more CPUs it is possible that more
1677 * buffers will be used simultaneously. The preallocated pool may grow.
1678 * This preallocation has also the side-effect that AppArmor will be
1679 * disabled early at boot if aa_g_path_max is extremly high.
1681 if (num_online_cpus() > 1)
1682 num = 4 + RESERVE_COUNT;
1684 num = 2 + RESERVE_COUNT;
1686 for (i = 0; i < num; i++) {
1688 aa_buf = kmalloc(aa_g_path_max, GFP_KERNEL |
1689 __GFP_RETRY_MAYFAIL | __GFP_NOWARN);
1694 aa_put_buffer(&aa_buf->buffer[0]);
1699 #ifdef CONFIG_SYSCTL
1700 static int apparmor_dointvec(struct ctl_table *table, int write,
1701 void *buffer, size_t *lenp, loff_t *ppos)
1703 if (!policy_admin_capable(NULL))
1705 if (!apparmor_enabled)
1708 return proc_dointvec(table, write, buffer, lenp, ppos);
1711 static struct ctl_path apparmor_sysctl_path[] = {
1712 { .procname = "kernel", },
1716 static struct ctl_table apparmor_sysctl_table[] = {
1718 .procname = "unprivileged_userns_apparmor_policy",
1719 .data = &unprivileged_userns_apparmor_policy,
1720 .maxlen = sizeof(int),
1722 .proc_handler = apparmor_dointvec,
1727 static int __init apparmor_init_sysctl(void)
1729 return register_sysctl_paths(apparmor_sysctl_path,
1730 apparmor_sysctl_table) ? 0 : -ENOMEM;
1733 static inline int apparmor_init_sysctl(void)
1737 #endif /* CONFIG_SYSCTL */
1739 #if defined(CONFIG_NETFILTER) && defined(CONFIG_NETWORK_SECMARK)
1740 static unsigned int apparmor_ip_postroute(void *priv,
1741 struct sk_buff *skb,
1742 const struct nf_hook_state *state)
1744 struct aa_sk_ctx *ctx;
1750 sk = skb_to_full_sk(skb);
1755 if (!apparmor_secmark_check(ctx->label, OP_SENDMSG, AA_MAY_SEND,
1759 return NF_DROP_ERR(-ECONNREFUSED);
1763 static unsigned int apparmor_ipv4_postroute(void *priv,
1764 struct sk_buff *skb,
1765 const struct nf_hook_state *state)
1767 return apparmor_ip_postroute(priv, skb, state);
1770 #if IS_ENABLED(CONFIG_IPV6)
1771 static unsigned int apparmor_ipv6_postroute(void *priv,
1772 struct sk_buff *skb,
1773 const struct nf_hook_state *state)
1775 return apparmor_ip_postroute(priv, skb, state);
1779 static const struct nf_hook_ops apparmor_nf_ops[] = {
1781 .hook = apparmor_ipv4_postroute,
1783 .hooknum = NF_INET_POST_ROUTING,
1784 .priority = NF_IP_PRI_SELINUX_FIRST,
1786 #if IS_ENABLED(CONFIG_IPV6)
1788 .hook = apparmor_ipv6_postroute,
1790 .hooknum = NF_INET_POST_ROUTING,
1791 .priority = NF_IP6_PRI_SELINUX_FIRST,
1796 static int __net_init apparmor_nf_register(struct net *net)
1800 ret = nf_register_net_hooks(net, apparmor_nf_ops,
1801 ARRAY_SIZE(apparmor_nf_ops));
1805 static void __net_exit apparmor_nf_unregister(struct net *net)
1807 nf_unregister_net_hooks(net, apparmor_nf_ops,
1808 ARRAY_SIZE(apparmor_nf_ops));
1811 static struct pernet_operations apparmor_net_ops = {
1812 .init = apparmor_nf_register,
1813 .exit = apparmor_nf_unregister,
1816 static int __init apparmor_nf_ip_init(void)
1820 if (!apparmor_enabled)
1823 err = register_pernet_subsys(&apparmor_net_ops);
1825 panic("Apparmor: register_pernet_subsys: error %d\n", err);
1829 __initcall(apparmor_nf_ip_init);
1832 static int __init apparmor_init(void)
1838 error = aa_setup_dfa_engine();
1840 AA_ERROR("Unable to setup dfa engine\n");
1844 error = aa_alloc_root_ns();
1846 AA_ERROR("Unable to allocate default profile namespace\n");
1850 error = apparmor_init_sysctl();
1852 AA_ERROR("Unable to register sysctls\n");
1857 error = alloc_buffers();
1859 AA_ERROR("Unable to allocate work buffers\n");
1863 error = set_init_ctx();
1865 AA_ERROR("Failed to set context on init task\n");
1869 security_add_hooks(apparmor_hooks, ARRAY_SIZE(apparmor_hooks),
1872 /* Report that AppArmor successfully initialized */
1873 apparmor_initialized = 1;
1874 if (aa_g_profile_mode == APPARMOR_COMPLAIN)
1875 aa_info_message("AppArmor initialized: complain mode enabled");
1876 else if (aa_g_profile_mode == APPARMOR_KILL)
1877 aa_info_message("AppArmor initialized: kill mode enabled");
1879 aa_info_message("AppArmor initialized");
1887 aa_teardown_dfa_engine();
1889 apparmor_enabled = false;
1893 DEFINE_LSM(apparmor) = {
1895 .flags = LSM_FLAG_LEGACY_MAJOR | LSM_FLAG_EXCLUSIVE,
1896 .enabled = &apparmor_enabled,
1897 .blobs = &apparmor_blob_sizes,
1898 .init = apparmor_init,