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>
26 #include <linux/netfilter_ipv4.h>
27 #include <linux/netfilter_ipv6.h>
29 #include <uapi/linux/mount.h>
31 #include "include/apparmor.h"
32 #include "include/apparmorfs.h"
33 #include "include/audit.h"
34 #include "include/capability.h"
35 #include "include/cred.h"
36 #include "include/file.h"
37 #include "include/ipc.h"
38 #include "include/net.h"
39 #include "include/path.h"
40 #include "include/label.h"
41 #include "include/policy.h"
42 #include "include/policy_ns.h"
43 #include "include/procattr.h"
44 #include "include/mount.h"
45 #include "include/secid.h"
47 /* Flag indicating whether initialization completed */
48 int apparmor_initialized;
50 DEFINE_PER_CPU(struct aa_buffers, aa_buffers);
58 * put the associated labels
60 static void apparmor_cred_free(struct cred *cred)
62 aa_put_label(cred_label(cred));
63 set_cred_label(cred, NULL);
67 * allocate the apparmor part of blank credentials
69 static int apparmor_cred_alloc_blank(struct cred *cred, gfp_t gfp)
71 set_cred_label(cred, NULL);
76 * prepare new cred label for modification by prepare_cred block
78 static int apparmor_cred_prepare(struct cred *new, const struct cred *old,
81 set_cred_label(new, aa_get_newest_label(cred_label(old)));
86 * transfer the apparmor data to a blank set of creds
88 static void apparmor_cred_transfer(struct cred *new, const struct cred *old)
90 set_cred_label(new, aa_get_newest_label(cred_label(old)));
93 static void apparmor_task_free(struct task_struct *task)
96 aa_free_task_ctx(task_ctx(task));
99 static int apparmor_task_alloc(struct task_struct *task,
100 unsigned long clone_flags)
102 struct aa_task_ctx *new = task_ctx(task);
104 aa_dup_task_ctx(new, task_ctx(current));
109 static int apparmor_ptrace_access_check(struct task_struct *child,
112 struct aa_label *tracer, *tracee;
115 tracer = __begin_current_label_crit_section();
116 tracee = aa_get_task_label(child);
117 error = aa_may_ptrace(tracer, tracee,
118 (mode & PTRACE_MODE_READ) ? AA_PTRACE_READ
120 aa_put_label(tracee);
121 __end_current_label_crit_section(tracer);
126 static int apparmor_ptrace_traceme(struct task_struct *parent)
128 struct aa_label *tracer, *tracee;
131 tracee = __begin_current_label_crit_section();
132 tracer = aa_get_task_label(parent);
133 error = aa_may_ptrace(tracer, tracee, AA_PTRACE_TRACE);
134 aa_put_label(tracer);
135 __end_current_label_crit_section(tracee);
140 /* Derived from security/commoncap.c:cap_capget */
141 static int apparmor_capget(struct task_struct *target, kernel_cap_t *effective,
142 kernel_cap_t *inheritable, kernel_cap_t *permitted)
144 struct aa_label *label;
145 const struct cred *cred;
148 cred = __task_cred(target);
149 label = aa_get_newest_cred_label(cred);
152 * cap_capget is stacked ahead of this and will
153 * initialize effective and permitted.
155 if (!unconfined(label)) {
156 struct aa_profile *profile;
159 label_for_each_confined(i, label, profile) {
160 if (COMPLAIN_MODE(profile))
162 *effective = cap_intersect(*effective,
163 profile->caps.allow);
164 *permitted = cap_intersect(*permitted,
165 profile->caps.allow);
174 static int apparmor_capable(const struct cred *cred, struct user_namespace *ns,
175 int cap, unsigned int opts)
177 struct aa_label *label;
180 label = aa_get_newest_cred_label(cred);
181 if (!unconfined(label))
182 error = aa_capable(label, cap, opts);
189 * common_perm - basic common permission check wrapper fn for paths
190 * @op: operation being checked
191 * @path: path to check permission of (NOT NULL)
192 * @mask: requested permissions mask
193 * @cond: conditional info for the permission request (NOT NULL)
195 * Returns: %0 else error code if error or permission denied
197 static int common_perm(const char *op, const struct path *path, u32 mask,
198 struct path_cond *cond)
200 struct aa_label *label;
203 label = __begin_current_label_crit_section();
204 if (!unconfined(label))
205 error = aa_path_perm(op, label, path, 0, mask, cond);
206 __end_current_label_crit_section(label);
212 * common_perm_cond - common permission wrapper around inode cond
213 * @op: operation being checked
214 * @path: location to check (NOT NULL)
215 * @mask: requested permissions mask
217 * Returns: %0 else error code if error or permission denied
219 static int common_perm_cond(const char *op, const struct path *path, u32 mask)
221 struct path_cond cond = { d_backing_inode(path->dentry)->i_uid,
222 d_backing_inode(path->dentry)->i_mode
225 if (!path_mediated_fs(path->dentry))
228 return common_perm(op, path, mask, &cond);
232 * common_perm_dir_dentry - common permission wrapper when path is dir, dentry
233 * @op: operation being checked
234 * @dir: directory of the dentry (NOT NULL)
235 * @dentry: dentry to check (NOT NULL)
236 * @mask: requested permissions mask
237 * @cond: conditional info for the permission request (NOT NULL)
239 * Returns: %0 else error code if error or permission denied
241 static int common_perm_dir_dentry(const char *op, const struct path *dir,
242 struct dentry *dentry, u32 mask,
243 struct path_cond *cond)
245 struct path path = { .mnt = dir->mnt, .dentry = dentry };
247 return common_perm(op, &path, mask, cond);
251 * common_perm_rm - common permission wrapper for operations doing rm
252 * @op: operation being checked
253 * @dir: directory that the dentry is in (NOT NULL)
254 * @dentry: dentry being rm'd (NOT NULL)
255 * @mask: requested permission mask
257 * Returns: %0 else error code if error or permission denied
259 static int common_perm_rm(const char *op, const struct path *dir,
260 struct dentry *dentry, u32 mask)
262 struct inode *inode = d_backing_inode(dentry);
263 struct path_cond cond = { };
265 if (!inode || !path_mediated_fs(dentry))
268 cond.uid = inode->i_uid;
269 cond.mode = inode->i_mode;
271 return common_perm_dir_dentry(op, dir, dentry, mask, &cond);
275 * common_perm_create - common permission wrapper for operations doing create
276 * @op: operation being checked
277 * @dir: directory that dentry will be created in (NOT NULL)
278 * @dentry: dentry to create (NOT NULL)
279 * @mask: request permission mask
280 * @mode: created file mode
282 * Returns: %0 else error code if error or permission denied
284 static int common_perm_create(const char *op, const struct path *dir,
285 struct dentry *dentry, u32 mask, umode_t mode)
287 struct path_cond cond = { current_fsuid(), mode };
289 if (!path_mediated_fs(dir->dentry))
292 return common_perm_dir_dentry(op, dir, dentry, mask, &cond);
295 static int apparmor_path_unlink(const struct path *dir, struct dentry *dentry)
297 return common_perm_rm(OP_UNLINK, dir, dentry, AA_MAY_DELETE);
300 static int apparmor_path_mkdir(const struct path *dir, struct dentry *dentry,
303 return common_perm_create(OP_MKDIR, dir, dentry, AA_MAY_CREATE,
307 static int apparmor_path_rmdir(const struct path *dir, struct dentry *dentry)
309 return common_perm_rm(OP_RMDIR, dir, dentry, AA_MAY_DELETE);
312 static int apparmor_path_mknod(const struct path *dir, struct dentry *dentry,
313 umode_t mode, unsigned int dev)
315 return common_perm_create(OP_MKNOD, dir, dentry, AA_MAY_CREATE, mode);
318 static int apparmor_path_truncate(const struct path *path)
320 return common_perm_cond(OP_TRUNC, path, MAY_WRITE | AA_MAY_SETATTR);
323 static int apparmor_path_symlink(const struct path *dir, struct dentry *dentry,
324 const char *old_name)
326 return common_perm_create(OP_SYMLINK, dir, dentry, AA_MAY_CREATE,
330 static int apparmor_path_link(struct dentry *old_dentry, const struct path *new_dir,
331 struct dentry *new_dentry)
333 struct aa_label *label;
336 if (!path_mediated_fs(old_dentry))
339 label = begin_current_label_crit_section();
340 if (!unconfined(label))
341 error = aa_path_link(label, old_dentry, new_dir, new_dentry);
342 end_current_label_crit_section(label);
347 static int apparmor_path_rename(const struct path *old_dir, struct dentry *old_dentry,
348 const struct path *new_dir, struct dentry *new_dentry)
350 struct aa_label *label;
353 if (!path_mediated_fs(old_dentry))
356 label = begin_current_label_crit_section();
357 if (!unconfined(label)) {
358 struct path old_path = { .mnt = old_dir->mnt,
359 .dentry = old_dentry };
360 struct path new_path = { .mnt = new_dir->mnt,
361 .dentry = new_dentry };
362 struct path_cond cond = { d_backing_inode(old_dentry)->i_uid,
363 d_backing_inode(old_dentry)->i_mode
366 error = aa_path_perm(OP_RENAME_SRC, label, &old_path, 0,
367 MAY_READ | AA_MAY_GETATTR | MAY_WRITE |
368 AA_MAY_SETATTR | AA_MAY_DELETE,
371 error = aa_path_perm(OP_RENAME_DEST, label, &new_path,
372 0, MAY_WRITE | AA_MAY_SETATTR |
373 AA_MAY_CREATE, &cond);
376 end_current_label_crit_section(label);
381 static int apparmor_path_chmod(const struct path *path, umode_t mode)
383 return common_perm_cond(OP_CHMOD, path, AA_MAY_CHMOD);
386 static int apparmor_path_chown(const struct path *path, kuid_t uid, kgid_t gid)
388 return common_perm_cond(OP_CHOWN, path, AA_MAY_CHOWN);
391 static int apparmor_inode_getattr(const struct path *path)
393 return common_perm_cond(OP_GETATTR, path, AA_MAY_GETATTR);
396 static int apparmor_file_open(struct file *file)
398 struct aa_file_ctx *fctx = file_ctx(file);
399 struct aa_label *label;
402 if (!path_mediated_fs(file->f_path.dentry))
405 /* If in exec, permission is handled by bprm hooks.
406 * Cache permissions granted by the previous exec check, with
407 * implicit read and executable mmap which are required to
408 * actually execute the image.
410 if (current->in_execve) {
411 fctx->allow = MAY_EXEC | MAY_READ | AA_EXEC_MMAP;
415 label = aa_get_newest_cred_label(file->f_cred);
416 if (!unconfined(label)) {
417 struct inode *inode = file_inode(file);
418 struct path_cond cond = { inode->i_uid, inode->i_mode };
420 error = aa_path_perm(OP_OPEN, label, &file->f_path, 0,
421 aa_map_file_to_perms(file), &cond);
422 /* todo cache full allowed permissions set and state */
423 fctx->allow = aa_map_file_to_perms(file);
430 static int apparmor_file_alloc_security(struct file *file)
432 struct aa_file_ctx *ctx = file_ctx(file);
433 struct aa_label *label = begin_current_label_crit_section();
435 spin_lock_init(&ctx->lock);
436 rcu_assign_pointer(ctx->label, aa_get_label(label));
437 end_current_label_crit_section(label);
441 static void apparmor_file_free_security(struct file *file)
443 struct aa_file_ctx *ctx = file_ctx(file);
446 aa_put_label(rcu_access_pointer(ctx->label));
449 static int common_file_perm(const char *op, struct file *file, u32 mask)
451 struct aa_label *label;
454 /* don't reaudit files closed during inheritance */
455 if (file->f_path.dentry == aa_null.dentry)
458 label = __begin_current_label_crit_section();
459 error = aa_file_perm(op, label, file, mask);
460 __end_current_label_crit_section(label);
465 static int apparmor_file_receive(struct file *file)
467 return common_file_perm(OP_FRECEIVE, file, aa_map_file_to_perms(file));
470 static int apparmor_file_permission(struct file *file, int mask)
472 return common_file_perm(OP_FPERM, file, mask);
475 static int apparmor_file_lock(struct file *file, unsigned int cmd)
477 u32 mask = AA_MAY_LOCK;
482 return common_file_perm(OP_FLOCK, file, mask);
485 static int common_mmap(const char *op, struct file *file, unsigned long prot,
490 if (!file || !file_ctx(file))
493 if (prot & PROT_READ)
496 * Private mappings don't require write perms since they don't
497 * write back to the files
499 if ((prot & PROT_WRITE) && !(flags & MAP_PRIVATE))
501 if (prot & PROT_EXEC)
502 mask |= AA_EXEC_MMAP;
504 return common_file_perm(op, file, mask);
507 static int apparmor_mmap_file(struct file *file, unsigned long reqprot,
508 unsigned long prot, unsigned long flags)
510 return common_mmap(OP_FMMAP, file, prot, flags);
513 static int apparmor_file_mprotect(struct vm_area_struct *vma,
514 unsigned long reqprot, unsigned long prot)
516 return common_mmap(OP_FMPROT, vma->vm_file, prot,
517 !(vma->vm_flags & VM_SHARED) ? MAP_PRIVATE : 0);
520 static int apparmor_sb_mount(const char *dev_name, const struct path *path,
521 const char *type, unsigned long flags, void *data)
523 struct aa_label *label;
527 if ((flags & MS_MGC_MSK) == MS_MGC_VAL)
528 flags &= ~MS_MGC_MSK;
530 flags &= ~AA_MS_IGNORE_MASK;
532 label = __begin_current_label_crit_section();
533 if (!unconfined(label)) {
534 if (flags & MS_REMOUNT)
535 error = aa_remount(label, path, flags, data);
536 else if (flags & MS_BIND)
537 error = aa_bind_mount(label, path, dev_name, flags);
538 else if (flags & (MS_SHARED | MS_PRIVATE | MS_SLAVE |
540 error = aa_mount_change_type(label, path, flags);
541 else if (flags & MS_MOVE)
542 error = aa_move_mount(label, path, dev_name);
544 error = aa_new_mount(label, dev_name, path, type,
547 __end_current_label_crit_section(label);
552 static int apparmor_sb_umount(struct vfsmount *mnt, int flags)
554 struct aa_label *label;
557 label = __begin_current_label_crit_section();
558 if (!unconfined(label))
559 error = aa_umount(label, mnt, flags);
560 __end_current_label_crit_section(label);
565 static int apparmor_sb_pivotroot(const struct path *old_path,
566 const struct path *new_path)
568 struct aa_label *label;
571 label = aa_get_current_label();
572 if (!unconfined(label))
573 error = aa_pivotroot(label, old_path, new_path);
579 static int apparmor_getprocattr(struct task_struct *task, char *name,
584 const struct cred *cred = get_task_cred(task);
585 struct aa_task_ctx *ctx = task_ctx(current);
586 struct aa_label *label = NULL;
588 if (strcmp(name, "current") == 0)
589 label = aa_get_newest_label(cred_label(cred));
590 else if (strcmp(name, "prev") == 0 && ctx->previous)
591 label = aa_get_newest_label(ctx->previous);
592 else if (strcmp(name, "exec") == 0 && ctx->onexec)
593 label = aa_get_newest_label(ctx->onexec);
598 error = aa_getprocattr(label, value);
606 static int apparmor_setprocattr(const char *name, void *value,
609 char *command, *largs = NULL, *args = value;
612 DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, OP_SETPROCATTR);
617 /* AppArmor requires that the buffer must be null terminated atm */
618 if (args[size - 1] != '\0') {
620 largs = args = kmalloc(size + 1, GFP_KERNEL);
623 memcpy(args, value, size);
629 command = strsep(&args, " ");
632 args = skip_spaces(args);
636 arg_size = size - (args - (largs ? largs : (char *) value));
637 if (strcmp(name, "current") == 0) {
638 if (strcmp(command, "changehat") == 0) {
639 error = aa_setprocattr_changehat(args, arg_size,
641 } else if (strcmp(command, "permhat") == 0) {
642 error = aa_setprocattr_changehat(args, arg_size,
644 } else if (strcmp(command, "changeprofile") == 0) {
645 error = aa_change_profile(args, AA_CHANGE_NOFLAGS);
646 } else if (strcmp(command, "permprofile") == 0) {
647 error = aa_change_profile(args, AA_CHANGE_TEST);
648 } else if (strcmp(command, "stack") == 0) {
649 error = aa_change_profile(args, AA_CHANGE_STACK);
652 } else if (strcmp(name, "exec") == 0) {
653 if (strcmp(command, "exec") == 0)
654 error = aa_change_profile(args, AA_CHANGE_ONEXEC);
655 else if (strcmp(command, "stack") == 0)
656 error = aa_change_profile(args, (AA_CHANGE_ONEXEC |
661 /* only support the "current" and "exec" process attributes */
671 aad(&sa)->label = begin_current_label_crit_section();
672 aad(&sa)->info = name;
673 aad(&sa)->error = error = -EINVAL;
674 aa_audit_msg(AUDIT_APPARMOR_DENIED, &sa, NULL);
675 end_current_label_crit_section(aad(&sa)->label);
680 * apparmor_bprm_committing_creds - do task cleanup on committing new creds
681 * @bprm: binprm for the exec (NOT NULL)
683 static void apparmor_bprm_committing_creds(struct linux_binprm *bprm)
685 struct aa_label *label = aa_current_raw_label();
686 struct aa_label *new_label = cred_label(bprm->cred);
688 /* bail out if unconfined or not changing profile */
689 if ((new_label->proxy == label->proxy) ||
690 (unconfined(new_label)))
693 aa_inherit_files(bprm->cred, current->files);
695 current->pdeath_signal = 0;
697 /* reset soft limits and set hard limits for the new label */
698 __aa_transition_rlimits(label, new_label);
702 * apparmor_bprm_committed_cred - do cleanup after new creds committed
703 * @bprm: binprm for the exec (NOT NULL)
705 static void apparmor_bprm_committed_creds(struct linux_binprm *bprm)
707 /* clear out temporary/transitional state from the context */
708 aa_clear_task_ctx_trans(task_ctx(current));
713 static void apparmor_task_getsecid(struct task_struct *p, u32 *secid)
715 struct aa_label *label = aa_get_task_label(p);
716 *secid = label->secid;
720 static int apparmor_task_setrlimit(struct task_struct *task,
721 unsigned int resource, struct rlimit *new_rlim)
723 struct aa_label *label = __begin_current_label_crit_section();
726 if (!unconfined(label))
727 error = aa_task_setrlimit(label, task, resource, new_rlim);
728 __end_current_label_crit_section(label);
733 static int apparmor_task_kill(struct task_struct *target, struct kernel_siginfo *info,
734 int sig, const struct cred *cred)
736 struct aa_label *cl, *tl;
741 * Dealing with USB IO specific behavior
743 cl = aa_get_newest_cred_label(cred);
744 tl = aa_get_task_label(target);
745 error = aa_may_signal(cl, tl, sig);
751 cl = __begin_current_label_crit_section();
752 tl = aa_get_task_label(target);
753 error = aa_may_signal(cl, tl, sig);
755 __end_current_label_crit_section(cl);
761 * apparmor_sk_alloc_security - allocate and attach the sk_security field
763 static int apparmor_sk_alloc_security(struct sock *sk, int family, gfp_t flags)
765 struct aa_sk_ctx *ctx;
767 ctx = kzalloc(sizeof(*ctx), flags);
777 * apparmor_sk_free_security - free the sk_security field
779 static void apparmor_sk_free_security(struct sock *sk)
781 struct aa_sk_ctx *ctx = SK_CTX(sk);
784 aa_put_label(ctx->label);
785 aa_put_label(ctx->peer);
790 * apparmor_clone_security - clone the sk_security field
792 static void apparmor_sk_clone_security(const struct sock *sk,
795 struct aa_sk_ctx *ctx = SK_CTX(sk);
796 struct aa_sk_ctx *new = SK_CTX(newsk);
798 new->label = aa_get_label(ctx->label);
799 new->peer = aa_get_label(ctx->peer);
803 * apparmor_socket_create - check perms before creating a new socket
805 static int apparmor_socket_create(int family, int type, int protocol, int kern)
807 struct aa_label *label;
810 AA_BUG(in_interrupt());
812 label = begin_current_label_crit_section();
813 if (!(kern || unconfined(label)))
814 error = af_select(family,
815 create_perm(label, family, type, protocol),
816 aa_af_perm(label, OP_CREATE, AA_MAY_CREATE,
817 family, type, protocol));
818 end_current_label_crit_section(label);
824 * apparmor_socket_post_create - setup the per-socket security struct
827 * - kernel sockets currently labeled unconfined but we may want to
828 * move to a special kernel label
829 * - socket may not have sk here if created with sock_create_lite or
830 * sock_alloc. These should be accept cases which will be handled in
833 static int apparmor_socket_post_create(struct socket *sock, int family,
834 int type, int protocol, int kern)
836 struct aa_label *label;
839 struct aa_ns *ns = aa_get_current_ns();
841 label = aa_get_label(ns_unconfined(ns));
844 label = aa_get_current_label();
847 struct aa_sk_ctx *ctx = SK_CTX(sock->sk);
849 aa_put_label(ctx->label);
850 ctx->label = aa_get_label(label);
858 * apparmor_socket_bind - check perms before bind addr to socket
860 static int apparmor_socket_bind(struct socket *sock,
861 struct sockaddr *address, int addrlen)
866 AA_BUG(in_interrupt());
868 return af_select(sock->sk->sk_family,
869 bind_perm(sock, address, addrlen),
870 aa_sk_perm(OP_BIND, AA_MAY_BIND, sock->sk));
874 * apparmor_socket_connect - check perms before connecting @sock to @address
876 static int apparmor_socket_connect(struct socket *sock,
877 struct sockaddr *address, int addrlen)
882 AA_BUG(in_interrupt());
884 return af_select(sock->sk->sk_family,
885 connect_perm(sock, address, addrlen),
886 aa_sk_perm(OP_CONNECT, AA_MAY_CONNECT, sock->sk));
890 * apparmor_socket_list - check perms before allowing listen
892 static int apparmor_socket_listen(struct socket *sock, int backlog)
896 AA_BUG(in_interrupt());
898 return af_select(sock->sk->sk_family,
899 listen_perm(sock, backlog),
900 aa_sk_perm(OP_LISTEN, AA_MAY_LISTEN, sock->sk));
904 * apparmor_socket_accept - check perms before accepting a new connection.
906 * Note: while @newsock is created and has some information, the accept
909 static int apparmor_socket_accept(struct socket *sock, struct socket *newsock)
914 AA_BUG(in_interrupt());
916 return af_select(sock->sk->sk_family,
917 accept_perm(sock, newsock),
918 aa_sk_perm(OP_ACCEPT, AA_MAY_ACCEPT, sock->sk));
921 static int aa_sock_msg_perm(const char *op, u32 request, struct socket *sock,
922 struct msghdr *msg, int size)
927 AA_BUG(in_interrupt());
929 return af_select(sock->sk->sk_family,
930 msg_perm(op, request, sock, msg, size),
931 aa_sk_perm(op, request, sock->sk));
935 * apparmor_socket_sendmsg - check perms before sending msg to another socket
937 static int apparmor_socket_sendmsg(struct socket *sock,
938 struct msghdr *msg, int size)
940 return aa_sock_msg_perm(OP_SENDMSG, AA_MAY_SEND, sock, msg, size);
944 * apparmor_socket_recvmsg - check perms before receiving a message
946 static int apparmor_socket_recvmsg(struct socket *sock,
947 struct msghdr *msg, int size, int flags)
949 return aa_sock_msg_perm(OP_RECVMSG, AA_MAY_RECEIVE, sock, msg, size);
952 /* revaliation, get/set attr, shutdown */
953 static int aa_sock_perm(const char *op, u32 request, struct socket *sock)
957 AA_BUG(in_interrupt());
959 return af_select(sock->sk->sk_family,
960 sock_perm(op, request, sock),
961 aa_sk_perm(op, request, sock->sk));
965 * apparmor_socket_getsockname - check perms before getting the local address
967 static int apparmor_socket_getsockname(struct socket *sock)
969 return aa_sock_perm(OP_GETSOCKNAME, AA_MAY_GETATTR, sock);
973 * apparmor_socket_getpeername - check perms before getting remote address
975 static int apparmor_socket_getpeername(struct socket *sock)
977 return aa_sock_perm(OP_GETPEERNAME, AA_MAY_GETATTR, sock);
980 /* revaliation, get/set attr, opt */
981 static int aa_sock_opt_perm(const char *op, u32 request, struct socket *sock,
982 int level, int optname)
986 AA_BUG(in_interrupt());
988 return af_select(sock->sk->sk_family,
989 opt_perm(op, request, sock, level, optname),
990 aa_sk_perm(op, request, sock->sk));
994 * apparmor_getsockopt - check perms before getting socket options
996 static int apparmor_socket_getsockopt(struct socket *sock, int level,
999 return aa_sock_opt_perm(OP_GETSOCKOPT, AA_MAY_GETOPT, sock,
1004 * apparmor_setsockopt - check perms before setting socket options
1006 static int apparmor_socket_setsockopt(struct socket *sock, int level,
1009 return aa_sock_opt_perm(OP_SETSOCKOPT, AA_MAY_SETOPT, sock,
1014 * apparmor_socket_shutdown - check perms before shutting down @sock conn
1016 static int apparmor_socket_shutdown(struct socket *sock, int how)
1018 return aa_sock_perm(OP_SHUTDOWN, AA_MAY_SHUTDOWN, sock);
1021 #ifdef CONFIG_NETWORK_SECMARK
1023 * apparmor_socket_sock_recv_skb - check perms before associating skb to sk
1025 * Note: can not sleep may be called with locks held
1027 * dont want protocol specific in __skb_recv_datagram()
1028 * to deny an incoming connection socket_sock_rcv_skb()
1030 static int apparmor_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
1032 struct aa_sk_ctx *ctx = SK_CTX(sk);
1037 return apparmor_secmark_check(ctx->label, OP_RECVMSG, AA_MAY_RECEIVE,
1043 static struct aa_label *sk_peer_label(struct sock *sk)
1045 struct aa_sk_ctx *ctx = SK_CTX(sk);
1050 return ERR_PTR(-ENOPROTOOPT);
1054 * apparmor_socket_getpeersec_stream - get security context of peer
1056 * Note: for tcp only valid if using ipsec or cipso on lan
1058 static int apparmor_socket_getpeersec_stream(struct socket *sock,
1059 char __user *optval,
1064 int slen, error = 0;
1065 struct aa_label *label;
1066 struct aa_label *peer;
1068 label = begin_current_label_crit_section();
1069 peer = sk_peer_label(sock->sk);
1071 error = PTR_ERR(peer);
1074 slen = aa_label_asxprint(&name, labels_ns(label), peer,
1075 FLAG_SHOW_MODE | FLAG_VIEW_SUBNS |
1076 FLAG_HIDDEN_UNCONFINED, GFP_KERNEL);
1077 /* don't include terminating \0 in slen, it breaks some apps */
1083 } else if (copy_to_user(optval, name, slen)) {
1087 if (put_user(slen, optlen))
1095 end_current_label_crit_section(label);
1101 * apparmor_socket_getpeersec_dgram - get security label of packet
1102 * @sock: the peer socket
1104 * @secid: pointer to where to put the secid of the packet
1106 * Sets the netlabel socket state on sk from parent
1108 static int apparmor_socket_getpeersec_dgram(struct socket *sock,
1109 struct sk_buff *skb, u32 *secid)
1112 /* TODO: requires secid support */
1113 return -ENOPROTOOPT;
1117 * apparmor_sock_graft - Initialize newly created socket
1119 * @parent: parent socket
1121 * Note: could set off of SOCK_CTX(parent) but need to track inode and we can
1122 * just set sk security information off of current creating process label
1123 * Labeling of sk for accept case - probably should be sock based
1124 * instead of task, because of the case where an implicitly labeled
1125 * socket is shared by different tasks.
1127 static void apparmor_sock_graft(struct sock *sk, struct socket *parent)
1129 struct aa_sk_ctx *ctx = SK_CTX(sk);
1132 ctx->label = aa_get_current_label();
1135 #ifdef CONFIG_NETWORK_SECMARK
1136 static int apparmor_inet_conn_request(struct sock *sk, struct sk_buff *skb,
1137 struct request_sock *req)
1139 struct aa_sk_ctx *ctx = SK_CTX(sk);
1144 return apparmor_secmark_check(ctx->label, OP_CONNECT, AA_MAY_CONNECT,
1150 * The cred blob is a pointer to, not an instance of, an aa_task_ctx.
1152 struct lsm_blob_sizes apparmor_blob_sizes __lsm_ro_after_init = {
1153 .lbs_cred = sizeof(struct aa_task_ctx *),
1154 .lbs_file = sizeof(struct aa_file_ctx),
1155 .lbs_task = sizeof(struct aa_task_ctx),
1158 static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = {
1159 LSM_HOOK_INIT(ptrace_access_check, apparmor_ptrace_access_check),
1160 LSM_HOOK_INIT(ptrace_traceme, apparmor_ptrace_traceme),
1161 LSM_HOOK_INIT(capget, apparmor_capget),
1162 LSM_HOOK_INIT(capable, apparmor_capable),
1164 LSM_HOOK_INIT(sb_mount, apparmor_sb_mount),
1165 LSM_HOOK_INIT(sb_umount, apparmor_sb_umount),
1166 LSM_HOOK_INIT(sb_pivotroot, apparmor_sb_pivotroot),
1168 LSM_HOOK_INIT(path_link, apparmor_path_link),
1169 LSM_HOOK_INIT(path_unlink, apparmor_path_unlink),
1170 LSM_HOOK_INIT(path_symlink, apparmor_path_symlink),
1171 LSM_HOOK_INIT(path_mkdir, apparmor_path_mkdir),
1172 LSM_HOOK_INIT(path_rmdir, apparmor_path_rmdir),
1173 LSM_HOOK_INIT(path_mknod, apparmor_path_mknod),
1174 LSM_HOOK_INIT(path_rename, apparmor_path_rename),
1175 LSM_HOOK_INIT(path_chmod, apparmor_path_chmod),
1176 LSM_HOOK_INIT(path_chown, apparmor_path_chown),
1177 LSM_HOOK_INIT(path_truncate, apparmor_path_truncate),
1178 LSM_HOOK_INIT(inode_getattr, apparmor_inode_getattr),
1180 LSM_HOOK_INIT(file_open, apparmor_file_open),
1181 LSM_HOOK_INIT(file_receive, apparmor_file_receive),
1182 LSM_HOOK_INIT(file_permission, apparmor_file_permission),
1183 LSM_HOOK_INIT(file_alloc_security, apparmor_file_alloc_security),
1184 LSM_HOOK_INIT(file_free_security, apparmor_file_free_security),
1185 LSM_HOOK_INIT(mmap_file, apparmor_mmap_file),
1186 LSM_HOOK_INIT(file_mprotect, apparmor_file_mprotect),
1187 LSM_HOOK_INIT(file_lock, apparmor_file_lock),
1189 LSM_HOOK_INIT(getprocattr, apparmor_getprocattr),
1190 LSM_HOOK_INIT(setprocattr, apparmor_setprocattr),
1192 LSM_HOOK_INIT(sk_alloc_security, apparmor_sk_alloc_security),
1193 LSM_HOOK_INIT(sk_free_security, apparmor_sk_free_security),
1194 LSM_HOOK_INIT(sk_clone_security, apparmor_sk_clone_security),
1196 LSM_HOOK_INIT(socket_create, apparmor_socket_create),
1197 LSM_HOOK_INIT(socket_post_create, apparmor_socket_post_create),
1198 LSM_HOOK_INIT(socket_bind, apparmor_socket_bind),
1199 LSM_HOOK_INIT(socket_connect, apparmor_socket_connect),
1200 LSM_HOOK_INIT(socket_listen, apparmor_socket_listen),
1201 LSM_HOOK_INIT(socket_accept, apparmor_socket_accept),
1202 LSM_HOOK_INIT(socket_sendmsg, apparmor_socket_sendmsg),
1203 LSM_HOOK_INIT(socket_recvmsg, apparmor_socket_recvmsg),
1204 LSM_HOOK_INIT(socket_getsockname, apparmor_socket_getsockname),
1205 LSM_HOOK_INIT(socket_getpeername, apparmor_socket_getpeername),
1206 LSM_HOOK_INIT(socket_getsockopt, apparmor_socket_getsockopt),
1207 LSM_HOOK_INIT(socket_setsockopt, apparmor_socket_setsockopt),
1208 LSM_HOOK_INIT(socket_shutdown, apparmor_socket_shutdown),
1209 #ifdef CONFIG_NETWORK_SECMARK
1210 LSM_HOOK_INIT(socket_sock_rcv_skb, apparmor_socket_sock_rcv_skb),
1212 LSM_HOOK_INIT(socket_getpeersec_stream,
1213 apparmor_socket_getpeersec_stream),
1214 LSM_HOOK_INIT(socket_getpeersec_dgram,
1215 apparmor_socket_getpeersec_dgram),
1216 LSM_HOOK_INIT(sock_graft, apparmor_sock_graft),
1217 #ifdef CONFIG_NETWORK_SECMARK
1218 LSM_HOOK_INIT(inet_conn_request, apparmor_inet_conn_request),
1221 LSM_HOOK_INIT(cred_alloc_blank, apparmor_cred_alloc_blank),
1222 LSM_HOOK_INIT(cred_free, apparmor_cred_free),
1223 LSM_HOOK_INIT(cred_prepare, apparmor_cred_prepare),
1224 LSM_HOOK_INIT(cred_transfer, apparmor_cred_transfer),
1226 LSM_HOOK_INIT(bprm_set_creds, apparmor_bprm_set_creds),
1227 LSM_HOOK_INIT(bprm_committing_creds, apparmor_bprm_committing_creds),
1228 LSM_HOOK_INIT(bprm_committed_creds, apparmor_bprm_committed_creds),
1230 LSM_HOOK_INIT(task_free, apparmor_task_free),
1231 LSM_HOOK_INIT(task_alloc, apparmor_task_alloc),
1232 LSM_HOOK_INIT(task_getsecid, apparmor_task_getsecid),
1233 LSM_HOOK_INIT(task_setrlimit, apparmor_task_setrlimit),
1234 LSM_HOOK_INIT(task_kill, apparmor_task_kill),
1237 LSM_HOOK_INIT(audit_rule_init, aa_audit_rule_init),
1238 LSM_HOOK_INIT(audit_rule_known, aa_audit_rule_known),
1239 LSM_HOOK_INIT(audit_rule_match, aa_audit_rule_match),
1240 LSM_HOOK_INIT(audit_rule_free, aa_audit_rule_free),
1243 LSM_HOOK_INIT(secid_to_secctx, apparmor_secid_to_secctx),
1244 LSM_HOOK_INIT(secctx_to_secid, apparmor_secctx_to_secid),
1245 LSM_HOOK_INIT(release_secctx, apparmor_release_secctx),
1249 * AppArmor sysfs module parameters
1252 static int param_set_aabool(const char *val, const struct kernel_param *kp);
1253 static int param_get_aabool(char *buffer, const struct kernel_param *kp);
1254 #define param_check_aabool param_check_bool
1255 static const struct kernel_param_ops param_ops_aabool = {
1256 .flags = KERNEL_PARAM_OPS_FL_NOARG,
1257 .set = param_set_aabool,
1258 .get = param_get_aabool
1261 static int param_set_aauint(const char *val, const struct kernel_param *kp);
1262 static int param_get_aauint(char *buffer, const struct kernel_param *kp);
1263 #define param_check_aauint param_check_uint
1264 static const struct kernel_param_ops param_ops_aauint = {
1265 .set = param_set_aauint,
1266 .get = param_get_aauint
1269 static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp);
1270 static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp);
1271 #define param_check_aalockpolicy param_check_bool
1272 static const struct kernel_param_ops param_ops_aalockpolicy = {
1273 .flags = KERNEL_PARAM_OPS_FL_NOARG,
1274 .set = param_set_aalockpolicy,
1275 .get = param_get_aalockpolicy
1278 static int param_set_audit(const char *val, const struct kernel_param *kp);
1279 static int param_get_audit(char *buffer, const struct kernel_param *kp);
1281 static int param_set_mode(const char *val, const struct kernel_param *kp);
1282 static int param_get_mode(char *buffer, const struct kernel_param *kp);
1284 /* Flag values, also controllable via /sys/module/apparmor/parameters
1285 * We define special types as we want to do additional mediation.
1288 /* AppArmor global enforcement switch - complain, enforce, kill */
1289 enum profile_mode aa_g_profile_mode = APPARMOR_ENFORCE;
1290 module_param_call(mode, param_set_mode, param_get_mode,
1291 &aa_g_profile_mode, S_IRUSR | S_IWUSR);
1293 /* whether policy verification hashing is enabled */
1294 bool aa_g_hash_policy = IS_ENABLED(CONFIG_SECURITY_APPARMOR_HASH_DEFAULT);
1295 #ifdef CONFIG_SECURITY_APPARMOR_HASH
1296 module_param_named(hash_policy, aa_g_hash_policy, aabool, S_IRUSR | S_IWUSR);
1300 bool aa_g_debug = IS_ENABLED(CONFIG_SECURITY_APPARMOR_DEBUG_MESSAGES);
1301 module_param_named(debug, aa_g_debug, aabool, S_IRUSR | S_IWUSR);
1304 enum audit_mode aa_g_audit;
1305 module_param_call(audit, param_set_audit, param_get_audit,
1306 &aa_g_audit, S_IRUSR | S_IWUSR);
1308 /* Determines if audit header is included in audited messages. This
1309 * provides more context if the audit daemon is not running
1311 bool aa_g_audit_header = true;
1312 module_param_named(audit_header, aa_g_audit_header, aabool,
1315 /* lock out loading/removal of policy
1316 * TODO: add in at boot loading of policy, which is the only way to
1317 * load policy, if lock_policy is set
1319 bool aa_g_lock_policy;
1320 module_param_named(lock_policy, aa_g_lock_policy, aalockpolicy,
1323 /* Syscall logging mode */
1324 bool aa_g_logsyscall;
1325 module_param_named(logsyscall, aa_g_logsyscall, aabool, S_IRUSR | S_IWUSR);
1327 /* Maximum pathname length before accesses will start getting rejected */
1328 unsigned int aa_g_path_max = 2 * PATH_MAX;
1329 module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR);
1331 /* Determines how paranoid loading of policy is and how much verification
1332 * on the loaded policy is done.
1333 * DEPRECATED: read only as strict checking of load is always done now
1334 * that none root users (user namespaces) can load policy.
1336 bool aa_g_paranoid_load = true;
1337 module_param_named(paranoid_load, aa_g_paranoid_load, aabool, S_IRUGO);
1339 /* Boot time disable flag */
1340 static int apparmor_enabled __lsm_ro_after_init = 1;
1341 module_param_named(enabled, apparmor_enabled, int, 0444);
1343 static int __init apparmor_enabled_setup(char *str)
1345 unsigned long enabled;
1346 int error = kstrtoul(str, 0, &enabled);
1348 apparmor_enabled = enabled ? 1 : 0;
1352 __setup("apparmor=", apparmor_enabled_setup);
1354 /* set global flag turning off the ability to load policy */
1355 static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp)
1357 if (!apparmor_enabled)
1359 if (apparmor_initialized && !policy_admin_capable(NULL))
1361 return param_set_bool(val, kp);
1364 static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp)
1366 if (!apparmor_enabled)
1368 if (apparmor_initialized && !policy_view_capable(NULL))
1370 return param_get_bool(buffer, kp);
1373 static int param_set_aabool(const char *val, const struct kernel_param *kp)
1375 if (!apparmor_enabled)
1377 if (apparmor_initialized && !policy_admin_capable(NULL))
1379 return param_set_bool(val, kp);
1382 static int param_get_aabool(char *buffer, const struct kernel_param *kp)
1384 if (!apparmor_enabled)
1386 if (apparmor_initialized && !policy_view_capable(NULL))
1388 return param_get_bool(buffer, kp);
1391 static int param_set_aauint(const char *val, const struct kernel_param *kp)
1395 if (!apparmor_enabled)
1397 /* file is ro but enforce 2nd line check */
1398 if (apparmor_initialized)
1401 error = param_set_uint(val, kp);
1402 pr_info("AppArmor: buffer size set to %d bytes\n", aa_g_path_max);
1407 static int param_get_aauint(char *buffer, const struct kernel_param *kp)
1409 if (!apparmor_enabled)
1411 if (apparmor_initialized && !policy_view_capable(NULL))
1413 return param_get_uint(buffer, kp);
1416 static int param_get_audit(char *buffer, const struct kernel_param *kp)
1418 if (!apparmor_enabled)
1420 if (apparmor_initialized && !policy_view_capable(NULL))
1422 return sprintf(buffer, "%s", audit_mode_names[aa_g_audit]);
1425 static int param_set_audit(const char *val, const struct kernel_param *kp)
1429 if (!apparmor_enabled)
1433 if (apparmor_initialized && !policy_admin_capable(NULL))
1436 i = match_string(audit_mode_names, AUDIT_MAX_INDEX, val);
1444 static int param_get_mode(char *buffer, const struct kernel_param *kp)
1446 if (!apparmor_enabled)
1448 if (apparmor_initialized && !policy_view_capable(NULL))
1451 return sprintf(buffer, "%s", aa_profile_mode_names[aa_g_profile_mode]);
1454 static int param_set_mode(const char *val, const struct kernel_param *kp)
1458 if (!apparmor_enabled)
1462 if (apparmor_initialized && !policy_admin_capable(NULL))
1465 i = match_string(aa_profile_mode_names, APPARMOR_MODE_NAMES_MAX_INDEX,
1470 aa_g_profile_mode = i;
1475 * AppArmor init functions
1479 * set_init_ctx - set a task context and profile on the first task.
1481 * TODO: allow setting an alternate profile than unconfined
1483 static int __init set_init_ctx(void)
1485 struct cred *cred = (struct cred *)current->real_cred;
1487 set_cred_label(cred, aa_get_label(ns_unconfined(root_ns)));
1492 static void destroy_buffers(void)
1496 for_each_possible_cpu(i) {
1497 for_each_cpu_buffer(j) {
1498 kfree(per_cpu(aa_buffers, i).buf[j]);
1499 per_cpu(aa_buffers, i).buf[j] = NULL;
1504 static int __init alloc_buffers(void)
1508 for_each_possible_cpu(i) {
1509 for_each_cpu_buffer(j) {
1512 if (cpu_to_node(i) > num_online_nodes())
1513 /* fallback to kmalloc for offline nodes */
1514 buffer = kmalloc(aa_g_path_max, GFP_KERNEL);
1516 buffer = kmalloc_node(aa_g_path_max, GFP_KERNEL,
1522 per_cpu(aa_buffers, i).buf[j] = buffer;
1529 #ifdef CONFIG_SYSCTL
1530 static int apparmor_dointvec(struct ctl_table *table, int write,
1531 void __user *buffer, size_t *lenp, loff_t *ppos)
1533 if (!policy_admin_capable(NULL))
1535 if (!apparmor_enabled)
1538 return proc_dointvec(table, write, buffer, lenp, ppos);
1541 static struct ctl_path apparmor_sysctl_path[] = {
1542 { .procname = "kernel", },
1546 static struct ctl_table apparmor_sysctl_table[] = {
1548 .procname = "unprivileged_userns_apparmor_policy",
1549 .data = &unprivileged_userns_apparmor_policy,
1550 .maxlen = sizeof(int),
1552 .proc_handler = apparmor_dointvec,
1557 static int __init apparmor_init_sysctl(void)
1559 return register_sysctl_paths(apparmor_sysctl_path,
1560 apparmor_sysctl_table) ? 0 : -ENOMEM;
1563 static inline int apparmor_init_sysctl(void)
1567 #endif /* CONFIG_SYSCTL */
1569 #if defined(CONFIG_NETFILTER) && defined(CONFIG_NETWORK_SECMARK)
1570 static unsigned int apparmor_ip_postroute(void *priv,
1571 struct sk_buff *skb,
1572 const struct nf_hook_state *state)
1574 struct aa_sk_ctx *ctx;
1580 sk = skb_to_full_sk(skb);
1585 if (!apparmor_secmark_check(ctx->label, OP_SENDMSG, AA_MAY_SEND,
1589 return NF_DROP_ERR(-ECONNREFUSED);
1593 static unsigned int apparmor_ipv4_postroute(void *priv,
1594 struct sk_buff *skb,
1595 const struct nf_hook_state *state)
1597 return apparmor_ip_postroute(priv, skb, state);
1600 #if IS_ENABLED(CONFIG_IPV6)
1601 static unsigned int apparmor_ipv6_postroute(void *priv,
1602 struct sk_buff *skb,
1603 const struct nf_hook_state *state)
1605 return apparmor_ip_postroute(priv, skb, state);
1609 static const struct nf_hook_ops apparmor_nf_ops[] = {
1611 .hook = apparmor_ipv4_postroute,
1613 .hooknum = NF_INET_POST_ROUTING,
1614 .priority = NF_IP_PRI_SELINUX_FIRST,
1616 #if IS_ENABLED(CONFIG_IPV6)
1618 .hook = apparmor_ipv6_postroute,
1620 .hooknum = NF_INET_POST_ROUTING,
1621 .priority = NF_IP6_PRI_SELINUX_FIRST,
1626 static int __net_init apparmor_nf_register(struct net *net)
1630 ret = nf_register_net_hooks(net, apparmor_nf_ops,
1631 ARRAY_SIZE(apparmor_nf_ops));
1635 static void __net_exit apparmor_nf_unregister(struct net *net)
1637 nf_unregister_net_hooks(net, apparmor_nf_ops,
1638 ARRAY_SIZE(apparmor_nf_ops));
1641 static struct pernet_operations apparmor_net_ops = {
1642 .init = apparmor_nf_register,
1643 .exit = apparmor_nf_unregister,
1646 static int __init apparmor_nf_ip_init(void)
1650 if (!apparmor_enabled)
1653 err = register_pernet_subsys(&apparmor_net_ops);
1655 panic("Apparmor: register_pernet_subsys: error %d\n", err);
1659 __initcall(apparmor_nf_ip_init);
1662 static int __init apparmor_init(void)
1668 error = aa_setup_dfa_engine();
1670 AA_ERROR("Unable to setup dfa engine\n");
1674 error = aa_alloc_root_ns();
1676 AA_ERROR("Unable to allocate default profile namespace\n");
1680 error = apparmor_init_sysctl();
1682 AA_ERROR("Unable to register sysctls\n");
1687 error = alloc_buffers();
1689 AA_ERROR("Unable to allocate work buffers\n");
1693 error = set_init_ctx();
1695 AA_ERROR("Failed to set context on init task\n");
1699 security_add_hooks(apparmor_hooks, ARRAY_SIZE(apparmor_hooks),
1702 /* Report that AppArmor successfully initialized */
1703 apparmor_initialized = 1;
1704 if (aa_g_profile_mode == APPARMOR_COMPLAIN)
1705 aa_info_message("AppArmor initialized: complain mode enabled");
1706 else if (aa_g_profile_mode == APPARMOR_KILL)
1707 aa_info_message("AppArmor initialized: kill mode enabled");
1709 aa_info_message("AppArmor initialized");
1718 aa_teardown_dfa_engine();
1720 apparmor_enabled = false;
1724 DEFINE_LSM(apparmor) = {
1726 .flags = LSM_FLAG_LEGACY_MAJOR | LSM_FLAG_EXCLUSIVE,
1727 .enabled = &apparmor_enabled,
1728 .blobs = &apparmor_blob_sizes,
1729 .init = apparmor_init,