Merge tag 'block-5.11-2021-01-16' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / security / apparmor / lsm.c
blob1b0aba8eb7235f129b260ae36f6ba1ab2c2317ca
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * AppArmor security module
5 * This file contains AppArmor LSM hooks.
7 * Copyright (C) 1998-2008 Novell/SUSE
8 * Copyright 2009-2010 Canonical Ltd.
9 */
11 #include <linux/lsm_hooks.h>
12 #include <linux/moduleparam.h>
13 #include <linux/mm.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>
25 #include <net/sock.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;
47 union aa_buffer {
48 struct list_head list;
49 char buffer[1];
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);
60 * LSM hook functions
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);
78 return 0;
82 * prepare new cred label for modification by prepare_cred block
84 static int apparmor_cred_prepare(struct cred *new, const struct cred *old,
85 gfp_t gfp)
87 set_cred_label(new, aa_get_newest_label(cred_label(old)));
88 return 0;
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));
112 return 0;
115 static int apparmor_ptrace_access_check(struct task_struct *child,
116 unsigned int mode)
118 struct aa_label *tracer, *tracee;
119 int error;
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
125 : AA_PTRACE_TRACE);
126 aa_put_label(tracee);
127 __end_current_label_crit_section(tracer);
129 return error;
132 static int apparmor_ptrace_traceme(struct task_struct *parent)
134 struct aa_label *tracer, *tracee;
135 int error;
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);
143 return error;
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;
153 rcu_read_lock();
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;
163 struct label_it i;
165 label_for_each_confined(i, label, profile) {
166 if (COMPLAIN_MODE(profile))
167 continue;
168 *effective = cap_intersect(*effective,
169 profile->caps.allow);
170 *permitted = cap_intersect(*permitted,
171 profile->caps.allow);
174 rcu_read_unlock();
175 aa_put_label(label);
177 return 0;
180 static int apparmor_capable(const struct cred *cred, struct user_namespace *ns,
181 int cap, unsigned int opts)
183 struct aa_label *label;
184 int error = 0;
186 label = aa_get_newest_cred_label(cred);
187 if (!unconfined(label))
188 error = aa_capable(label, cap, opts);
189 aa_put_label(label);
191 return error;
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;
207 int error = 0;
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);
214 return error;
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))
232 return 0;
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))
272 return 0;
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))
296 return 0;
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,
307 umode_t mode)
309 return common_perm_create(OP_MKDIR, dir, dentry, AA_MAY_CREATE,
310 S_IFDIR);
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,
333 S_IFLNK);
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;
340 int error = 0;
342 if (!path_mediated_fs(old_dentry))
343 return 0;
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);
350 return error;
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;
357 int error = 0;
359 if (!path_mediated_fs(old_dentry))
360 return 0;
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,
375 &cond);
376 if (!error)
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);
384 return error;
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;
406 int error = 0;
408 if (!path_mediated_fs(file->f_path.dentry))
409 return 0;
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;
418 return 0;
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);
431 aa_put_label(label);
433 return error;
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);
444 return 0;
447 static void apparmor_file_free_security(struct file *file)
449 struct aa_file_ctx *ctx = file_ctx(file);
451 if (ctx)
452 aa_put_label(rcu_access_pointer(ctx->label));
455 static int common_file_perm(const char *op, struct file *file, u32 mask,
456 bool in_atomic)
458 struct aa_label *label;
459 int error = 0;
461 /* don't reaudit files closed during inheritance */
462 if (file->f_path.dentry == aa_null.dentry)
463 return -EACCES;
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);
469 return error;
472 static int apparmor_file_receive(struct file *file)
474 return common_file_perm(OP_FRECEIVE, file, aa_map_file_to_perms(file),
475 false);
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;
487 if (cmd == F_WRLCK)
488 mask |= MAY_WRITE;
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)
496 int mask = 0;
498 if (!file || !file_ctx(file))
499 return 0;
501 if (prot & PROT_READ)
502 mask |= MAY_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))
508 mask |= MAY_WRITE;
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,
526 false);
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;
533 int error = 0;
535 /* Discard magic */
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 |
548 MS_UNBINDABLE))
549 error = aa_mount_change_type(label, path, flags);
550 else if (flags & MS_MOVE)
551 error = aa_move_mount(label, path, dev_name);
552 else
553 error = aa_new_mount(label, dev_name, path, type,
554 flags, data);
556 __end_current_label_crit_section(label);
558 return error;
561 static int apparmor_sb_umount(struct vfsmount *mnt, int flags)
563 struct aa_label *label;
564 int error = 0;
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);
571 return error;
574 static int apparmor_sb_pivotroot(const struct path *old_path,
575 const struct path *new_path)
577 struct aa_label *label;
578 int error = 0;
580 label = aa_get_current_label();
581 if (!unconfined(label))
582 error = aa_pivotroot(label, old_path, new_path);
583 aa_put_label(label);
585 return error;
588 static int apparmor_getprocattr(struct task_struct *task, char *name,
589 char **value)
591 int error = -ENOENT;
592 /* released below */
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);
603 else
604 error = -EINVAL;
606 if (label)
607 error = aa_getprocattr(label, value);
609 aa_put_label(label);
610 put_cred(cred);
612 return error;
615 static int apparmor_setprocattr(const char *name, void *value,
616 size_t size)
618 char *command, *largs = NULL, *args = value;
619 size_t arg_size;
620 int error;
621 DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, OP_SETPROCATTR);
623 if (size == 0)
624 return -EINVAL;
626 /* AppArmor requires that the buffer must be null terminated atm */
627 if (args[size - 1] != '\0') {
628 /* null terminate */
629 largs = args = kmalloc(size + 1, GFP_KERNEL);
630 if (!args)
631 return -ENOMEM;
632 memcpy(args, value, size);
633 args[size] = '\0';
636 error = -EINVAL;
637 args = strim(args);
638 command = strsep(&args, " ");
639 if (!args)
640 goto out;
641 args = skip_spaces(args);
642 if (!*args)
643 goto out;
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,
649 AA_CHANGE_NOFLAGS);
650 } else if (strcmp(command, "permhat") == 0) {
651 error = aa_setprocattr_changehat(args, arg_size,
652 AA_CHANGE_TEST);
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);
659 } else
660 goto fail;
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 |
666 AA_CHANGE_STACK));
667 else
668 goto fail;
669 } else
670 /* only support the "current" and "exec" process attributes */
671 goto fail;
673 if (!error)
674 error = size;
675 out:
676 kfree(largs);
677 return error;
679 fail:
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);
685 goto out;
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)))
700 return;
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));
719 return;
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;
726 aa_put_label(label);
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();
733 int error = 0;
735 if (!unconfined(label))
736 error = aa_task_setrlimit(label, task, resource, new_rlim);
737 __end_current_label_crit_section(label);
739 return error;
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;
746 int error;
748 if (cred) {
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);
755 aa_put_label(cl);
756 aa_put_label(tl);
757 return error;
760 cl = __begin_current_label_crit_section();
761 tl = aa_get_task_label(target);
762 error = aa_may_signal(cl, tl, sig);
763 aa_put_label(tl);
764 __end_current_label_crit_section(cl);
766 return error;
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);
777 if (!ctx)
778 return -ENOMEM;
780 SK_CTX(sk) = ctx;
782 return 0;
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);
792 SK_CTX(sk) = NULL;
793 aa_put_label(ctx->label);
794 aa_put_label(ctx->peer);
795 kfree(ctx);
799 * apparmor_clone_security - clone the sk_security field
801 static void apparmor_sk_clone_security(const struct sock *sk,
802 struct sock *newsk)
804 struct aa_sk_ctx *ctx = SK_CTX(sk);
805 struct aa_sk_ctx *new = SK_CTX(newsk);
807 if (new->label)
808 aa_put_label(new->label);
809 new->label = aa_get_label(ctx->label);
811 if (new->peer)
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;
822 int error = 0;
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);
834 return error;
838 * apparmor_socket_post_create - setup the per-socket security struct
840 * Note:
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
845 * sock_graft.
847 static int apparmor_socket_post_create(struct socket *sock, int family,
848 int type, int protocol, int kern)
850 struct aa_label *label;
852 if (kern) {
853 struct aa_ns *ns = aa_get_current_ns();
855 label = aa_get_label(ns_unconfined(ns));
856 aa_put_ns(ns);
857 } else
858 label = aa_get_current_label();
860 if (sock->sk) {
861 struct aa_sk_ctx *ctx = SK_CTX(sock->sk);
863 aa_put_label(ctx->label);
864 ctx->label = aa_get_label(label);
866 aa_put_label(label);
868 return 0;
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)
877 AA_BUG(!sock);
878 AA_BUG(!sock->sk);
879 AA_BUG(!address);
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)
893 AA_BUG(!sock);
894 AA_BUG(!sock->sk);
895 AA_BUG(!address);
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)
908 AA_BUG(!sock);
909 AA_BUG(!sock->sk);
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
921 * has not been done.
923 static int apparmor_socket_accept(struct socket *sock, struct socket *newsock)
925 AA_BUG(!sock);
926 AA_BUG(!sock->sk);
927 AA_BUG(!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)
938 AA_BUG(!sock);
939 AA_BUG(!sock->sk);
940 AA_BUG(!msg);
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)
969 AA_BUG(!sock);
970 AA_BUG(!sock->sk);
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)
998 AA_BUG(!sock);
999 AA_BUG(!sock->sk);
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,
1011 int optname)
1013 return aa_sock_opt_perm(OP_GETSOCKOPT, AA_MAY_GETOPT, sock,
1014 level, optname);
1018 * apparmor_setsockopt - check perms before setting socket options
1020 static int apparmor_socket_setsockopt(struct socket *sock, int level,
1021 int optname)
1023 return aa_sock_opt_perm(OP_SETSOCKOPT, AA_MAY_SETOPT, sock,
1024 level, optname);
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);
1048 if (!skb->secmark)
1049 return 0;
1051 return apparmor_secmark_check(ctx->label, OP_RECVMSG, AA_MAY_RECEIVE,
1052 skb->secmark, sk);
1054 #endif
1057 static struct aa_label *sk_peer_label(struct sock *sk)
1059 struct aa_sk_ctx *ctx = SK_CTX(sk);
1061 if (ctx->peer)
1062 return ctx->peer;
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 char __user *optval,
1074 int __user *optlen,
1075 unsigned int len)
1077 char *name;
1078 int slen, error = 0;
1079 struct aa_label *label;
1080 struct aa_label *peer;
1082 label = begin_current_label_crit_section();
1083 peer = sk_peer_label(sock->sk);
1084 if (IS_ERR(peer)) {
1085 error = PTR_ERR(peer);
1086 goto done;
1088 slen = aa_label_asxprint(&name, labels_ns(label), peer,
1089 FLAG_SHOW_MODE | FLAG_VIEW_SUBNS |
1090 FLAG_HIDDEN_UNCONFINED, GFP_KERNEL);
1091 /* don't include terminating \0 in slen, it breaks some apps */
1092 if (slen < 0) {
1093 error = -ENOMEM;
1094 } else {
1095 if (slen > len) {
1096 error = -ERANGE;
1097 } else if (copy_to_user(optval, name, slen)) {
1098 error = -EFAULT;
1099 goto out;
1101 if (put_user(slen, optlen))
1102 error = -EFAULT;
1103 out:
1104 kfree(name);
1108 done:
1109 end_current_label_crit_section(label);
1111 return error;
1115 * apparmor_socket_getpeersec_dgram - get security label of packet
1116 * @sock: the peer socket
1117 * @skb: packet data
1118 * @secid: pointer to where to put the secid of the packet
1120 * Sets the netlabel socket state on sk from parent
1122 static int apparmor_socket_getpeersec_dgram(struct socket *sock,
1123 struct sk_buff *skb, u32 *secid)
1126 /* TODO: requires secid support */
1127 return -ENOPROTOOPT;
1131 * apparmor_sock_graft - Initialize newly created socket
1132 * @sk: child sock
1133 * @parent: parent socket
1135 * Note: could set off of SOCK_CTX(parent) but need to track inode and we can
1136 * just set sk security information off of current creating process label
1137 * Labeling of sk for accept case - probably should be sock based
1138 * instead of task, because of the case where an implicitly labeled
1139 * socket is shared by different tasks.
1141 static void apparmor_sock_graft(struct sock *sk, struct socket *parent)
1143 struct aa_sk_ctx *ctx = SK_CTX(sk);
1145 if (!ctx->label)
1146 ctx->label = aa_get_current_label();
1149 #ifdef CONFIG_NETWORK_SECMARK
1150 static int apparmor_inet_conn_request(const struct sock *sk, struct sk_buff *skb,
1151 struct request_sock *req)
1153 struct aa_sk_ctx *ctx = SK_CTX(sk);
1155 if (!skb->secmark)
1156 return 0;
1158 return apparmor_secmark_check(ctx->label, OP_CONNECT, AA_MAY_CONNECT,
1159 skb->secmark, sk);
1161 #endif
1164 * The cred blob is a pointer to, not an instance of, an aa_task_ctx.
1166 struct lsm_blob_sizes apparmor_blob_sizes __lsm_ro_after_init = {
1167 .lbs_cred = sizeof(struct aa_task_ctx *),
1168 .lbs_file = sizeof(struct aa_file_ctx),
1169 .lbs_task = sizeof(struct aa_task_ctx),
1172 static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = {
1173 LSM_HOOK_INIT(ptrace_access_check, apparmor_ptrace_access_check),
1174 LSM_HOOK_INIT(ptrace_traceme, apparmor_ptrace_traceme),
1175 LSM_HOOK_INIT(capget, apparmor_capget),
1176 LSM_HOOK_INIT(capable, apparmor_capable),
1178 LSM_HOOK_INIT(sb_mount, apparmor_sb_mount),
1179 LSM_HOOK_INIT(sb_umount, apparmor_sb_umount),
1180 LSM_HOOK_INIT(sb_pivotroot, apparmor_sb_pivotroot),
1182 LSM_HOOK_INIT(path_link, apparmor_path_link),
1183 LSM_HOOK_INIT(path_unlink, apparmor_path_unlink),
1184 LSM_HOOK_INIT(path_symlink, apparmor_path_symlink),
1185 LSM_HOOK_INIT(path_mkdir, apparmor_path_mkdir),
1186 LSM_HOOK_INIT(path_rmdir, apparmor_path_rmdir),
1187 LSM_HOOK_INIT(path_mknod, apparmor_path_mknod),
1188 LSM_HOOK_INIT(path_rename, apparmor_path_rename),
1189 LSM_HOOK_INIT(path_chmod, apparmor_path_chmod),
1190 LSM_HOOK_INIT(path_chown, apparmor_path_chown),
1191 LSM_HOOK_INIT(path_truncate, apparmor_path_truncate),
1192 LSM_HOOK_INIT(inode_getattr, apparmor_inode_getattr),
1194 LSM_HOOK_INIT(file_open, apparmor_file_open),
1195 LSM_HOOK_INIT(file_receive, apparmor_file_receive),
1196 LSM_HOOK_INIT(file_permission, apparmor_file_permission),
1197 LSM_HOOK_INIT(file_alloc_security, apparmor_file_alloc_security),
1198 LSM_HOOK_INIT(file_free_security, apparmor_file_free_security),
1199 LSM_HOOK_INIT(mmap_file, apparmor_mmap_file),
1200 LSM_HOOK_INIT(file_mprotect, apparmor_file_mprotect),
1201 LSM_HOOK_INIT(file_lock, apparmor_file_lock),
1203 LSM_HOOK_INIT(getprocattr, apparmor_getprocattr),
1204 LSM_HOOK_INIT(setprocattr, apparmor_setprocattr),
1206 LSM_HOOK_INIT(sk_alloc_security, apparmor_sk_alloc_security),
1207 LSM_HOOK_INIT(sk_free_security, apparmor_sk_free_security),
1208 LSM_HOOK_INIT(sk_clone_security, apparmor_sk_clone_security),
1210 LSM_HOOK_INIT(socket_create, apparmor_socket_create),
1211 LSM_HOOK_INIT(socket_post_create, apparmor_socket_post_create),
1212 LSM_HOOK_INIT(socket_bind, apparmor_socket_bind),
1213 LSM_HOOK_INIT(socket_connect, apparmor_socket_connect),
1214 LSM_HOOK_INIT(socket_listen, apparmor_socket_listen),
1215 LSM_HOOK_INIT(socket_accept, apparmor_socket_accept),
1216 LSM_HOOK_INIT(socket_sendmsg, apparmor_socket_sendmsg),
1217 LSM_HOOK_INIT(socket_recvmsg, apparmor_socket_recvmsg),
1218 LSM_HOOK_INIT(socket_getsockname, apparmor_socket_getsockname),
1219 LSM_HOOK_INIT(socket_getpeername, apparmor_socket_getpeername),
1220 LSM_HOOK_INIT(socket_getsockopt, apparmor_socket_getsockopt),
1221 LSM_HOOK_INIT(socket_setsockopt, apparmor_socket_setsockopt),
1222 LSM_HOOK_INIT(socket_shutdown, apparmor_socket_shutdown),
1223 #ifdef CONFIG_NETWORK_SECMARK
1224 LSM_HOOK_INIT(socket_sock_rcv_skb, apparmor_socket_sock_rcv_skb),
1225 #endif
1226 LSM_HOOK_INIT(socket_getpeersec_stream,
1227 apparmor_socket_getpeersec_stream),
1228 LSM_HOOK_INIT(socket_getpeersec_dgram,
1229 apparmor_socket_getpeersec_dgram),
1230 LSM_HOOK_INIT(sock_graft, apparmor_sock_graft),
1231 #ifdef CONFIG_NETWORK_SECMARK
1232 LSM_HOOK_INIT(inet_conn_request, apparmor_inet_conn_request),
1233 #endif
1235 LSM_HOOK_INIT(cred_alloc_blank, apparmor_cred_alloc_blank),
1236 LSM_HOOK_INIT(cred_free, apparmor_cred_free),
1237 LSM_HOOK_INIT(cred_prepare, apparmor_cred_prepare),
1238 LSM_HOOK_INIT(cred_transfer, apparmor_cred_transfer),
1240 LSM_HOOK_INIT(bprm_creds_for_exec, apparmor_bprm_creds_for_exec),
1241 LSM_HOOK_INIT(bprm_committing_creds, apparmor_bprm_committing_creds),
1242 LSM_HOOK_INIT(bprm_committed_creds, apparmor_bprm_committed_creds),
1244 LSM_HOOK_INIT(task_free, apparmor_task_free),
1245 LSM_HOOK_INIT(task_alloc, apparmor_task_alloc),
1246 LSM_HOOK_INIT(task_getsecid, apparmor_task_getsecid),
1247 LSM_HOOK_INIT(task_setrlimit, apparmor_task_setrlimit),
1248 LSM_HOOK_INIT(task_kill, apparmor_task_kill),
1250 #ifdef CONFIG_AUDIT
1251 LSM_HOOK_INIT(audit_rule_init, aa_audit_rule_init),
1252 LSM_HOOK_INIT(audit_rule_known, aa_audit_rule_known),
1253 LSM_HOOK_INIT(audit_rule_match, aa_audit_rule_match),
1254 LSM_HOOK_INIT(audit_rule_free, aa_audit_rule_free),
1255 #endif
1257 LSM_HOOK_INIT(secid_to_secctx, apparmor_secid_to_secctx),
1258 LSM_HOOK_INIT(secctx_to_secid, apparmor_secctx_to_secid),
1259 LSM_HOOK_INIT(release_secctx, apparmor_release_secctx),
1263 * AppArmor sysfs module parameters
1266 static int param_set_aabool(const char *val, const struct kernel_param *kp);
1267 static int param_get_aabool(char *buffer, const struct kernel_param *kp);
1268 #define param_check_aabool param_check_bool
1269 static const struct kernel_param_ops param_ops_aabool = {
1270 .flags = KERNEL_PARAM_OPS_FL_NOARG,
1271 .set = param_set_aabool,
1272 .get = param_get_aabool
1275 static int param_set_aauint(const char *val, const struct kernel_param *kp);
1276 static int param_get_aauint(char *buffer, const struct kernel_param *kp);
1277 #define param_check_aauint param_check_uint
1278 static const struct kernel_param_ops param_ops_aauint = {
1279 .set = param_set_aauint,
1280 .get = param_get_aauint
1283 static int param_set_aacompressionlevel(const char *val,
1284 const struct kernel_param *kp);
1285 static int param_get_aacompressionlevel(char *buffer,
1286 const struct kernel_param *kp);
1287 #define param_check_aacompressionlevel param_check_int
1288 static const struct kernel_param_ops param_ops_aacompressionlevel = {
1289 .set = param_set_aacompressionlevel,
1290 .get = param_get_aacompressionlevel
1293 static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp);
1294 static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp);
1295 #define param_check_aalockpolicy param_check_bool
1296 static const struct kernel_param_ops param_ops_aalockpolicy = {
1297 .flags = KERNEL_PARAM_OPS_FL_NOARG,
1298 .set = param_set_aalockpolicy,
1299 .get = param_get_aalockpolicy
1302 static int param_set_audit(const char *val, const struct kernel_param *kp);
1303 static int param_get_audit(char *buffer, const struct kernel_param *kp);
1305 static int param_set_mode(const char *val, const struct kernel_param *kp);
1306 static int param_get_mode(char *buffer, const struct kernel_param *kp);
1308 /* Flag values, also controllable via /sys/module/apparmor/parameters
1309 * We define special types as we want to do additional mediation.
1312 /* AppArmor global enforcement switch - complain, enforce, kill */
1313 enum profile_mode aa_g_profile_mode = APPARMOR_ENFORCE;
1314 module_param_call(mode, param_set_mode, param_get_mode,
1315 &aa_g_profile_mode, S_IRUSR | S_IWUSR);
1317 /* whether policy verification hashing is enabled */
1318 bool aa_g_hash_policy = IS_ENABLED(CONFIG_SECURITY_APPARMOR_HASH_DEFAULT);
1319 #ifdef CONFIG_SECURITY_APPARMOR_HASH
1320 module_param_named(hash_policy, aa_g_hash_policy, aabool, S_IRUSR | S_IWUSR);
1321 #endif
1323 /* policy loaddata compression level */
1324 int aa_g_rawdata_compression_level = Z_DEFAULT_COMPRESSION;
1325 module_param_named(rawdata_compression_level, aa_g_rawdata_compression_level,
1326 aacompressionlevel, 0400);
1328 /* Debug mode */
1329 bool aa_g_debug = IS_ENABLED(CONFIG_SECURITY_APPARMOR_DEBUG_MESSAGES);
1330 module_param_named(debug, aa_g_debug, aabool, S_IRUSR | S_IWUSR);
1332 /* Audit mode */
1333 enum audit_mode aa_g_audit;
1334 module_param_call(audit, param_set_audit, param_get_audit,
1335 &aa_g_audit, S_IRUSR | S_IWUSR);
1337 /* Determines if audit header is included in audited messages. This
1338 * provides more context if the audit daemon is not running
1340 bool aa_g_audit_header = true;
1341 module_param_named(audit_header, aa_g_audit_header, aabool,
1342 S_IRUSR | S_IWUSR);
1344 /* lock out loading/removal of policy
1345 * TODO: add in at boot loading of policy, which is the only way to
1346 * load policy, if lock_policy is set
1348 bool aa_g_lock_policy;
1349 module_param_named(lock_policy, aa_g_lock_policy, aalockpolicy,
1350 S_IRUSR | S_IWUSR);
1352 /* Syscall logging mode */
1353 bool aa_g_logsyscall;
1354 module_param_named(logsyscall, aa_g_logsyscall, aabool, S_IRUSR | S_IWUSR);
1356 /* Maximum pathname length before accesses will start getting rejected */
1357 unsigned int aa_g_path_max = 2 * PATH_MAX;
1358 module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR);
1360 /* Determines how paranoid loading of policy is and how much verification
1361 * on the loaded policy is done.
1362 * DEPRECATED: read only as strict checking of load is always done now
1363 * that none root users (user namespaces) can load policy.
1365 bool aa_g_paranoid_load = true;
1366 module_param_named(paranoid_load, aa_g_paranoid_load, aabool, S_IRUGO);
1368 static int param_get_aaintbool(char *buffer, const struct kernel_param *kp);
1369 static int param_set_aaintbool(const char *val, const struct kernel_param *kp);
1370 #define param_check_aaintbool param_check_int
1371 static const struct kernel_param_ops param_ops_aaintbool = {
1372 .set = param_set_aaintbool,
1373 .get = param_get_aaintbool
1375 /* Boot time disable flag */
1376 static int apparmor_enabled __lsm_ro_after_init = 1;
1377 module_param_named(enabled, apparmor_enabled, aaintbool, 0444);
1379 static int __init apparmor_enabled_setup(char *str)
1381 unsigned long enabled;
1382 int error = kstrtoul(str, 0, &enabled);
1383 if (!error)
1384 apparmor_enabled = enabled ? 1 : 0;
1385 return 1;
1388 __setup("apparmor=", apparmor_enabled_setup);
1390 /* set global flag turning off the ability to load policy */
1391 static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp)
1393 if (!apparmor_enabled)
1394 return -EINVAL;
1395 if (apparmor_initialized && !policy_admin_capable(NULL))
1396 return -EPERM;
1397 return param_set_bool(val, kp);
1400 static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp)
1402 if (!apparmor_enabled)
1403 return -EINVAL;
1404 if (apparmor_initialized && !policy_view_capable(NULL))
1405 return -EPERM;
1406 return param_get_bool(buffer, kp);
1409 static int param_set_aabool(const char *val, const struct kernel_param *kp)
1411 if (!apparmor_enabled)
1412 return -EINVAL;
1413 if (apparmor_initialized && !policy_admin_capable(NULL))
1414 return -EPERM;
1415 return param_set_bool(val, kp);
1418 static int param_get_aabool(char *buffer, const struct kernel_param *kp)
1420 if (!apparmor_enabled)
1421 return -EINVAL;
1422 if (apparmor_initialized && !policy_view_capable(NULL))
1423 return -EPERM;
1424 return param_get_bool(buffer, kp);
1427 static int param_set_aauint(const char *val, const struct kernel_param *kp)
1429 int error;
1431 if (!apparmor_enabled)
1432 return -EINVAL;
1433 /* file is ro but enforce 2nd line check */
1434 if (apparmor_initialized)
1435 return -EPERM;
1437 error = param_set_uint(val, kp);
1438 aa_g_path_max = max_t(uint32_t, aa_g_path_max, sizeof(union aa_buffer));
1439 pr_info("AppArmor: buffer size set to %d bytes\n", aa_g_path_max);
1441 return error;
1444 static int param_get_aauint(char *buffer, const struct kernel_param *kp)
1446 if (!apparmor_enabled)
1447 return -EINVAL;
1448 if (apparmor_initialized && !policy_view_capable(NULL))
1449 return -EPERM;
1450 return param_get_uint(buffer, kp);
1453 /* Can only be set before AppArmor is initialized (i.e. on boot cmdline). */
1454 static int param_set_aaintbool(const char *val, const struct kernel_param *kp)
1456 struct kernel_param kp_local;
1457 bool value;
1458 int error;
1460 if (apparmor_initialized)
1461 return -EPERM;
1463 /* Create local copy, with arg pointing to bool type. */
1464 value = !!*((int *)kp->arg);
1465 memcpy(&kp_local, kp, sizeof(kp_local));
1466 kp_local.arg = &value;
1468 error = param_set_bool(val, &kp_local);
1469 if (!error)
1470 *((int *)kp->arg) = *((bool *)kp_local.arg);
1471 return error;
1475 * To avoid changing /sys/module/apparmor/parameters/enabled from Y/N to
1476 * 1/0, this converts the "int that is actually bool" back to bool for
1477 * display in the /sys filesystem, while keeping it "int" for the LSM
1478 * infrastructure.
1480 static int param_get_aaintbool(char *buffer, const struct kernel_param *kp)
1482 struct kernel_param kp_local;
1483 bool value;
1485 /* Create local copy, with arg pointing to bool type. */
1486 value = !!*((int *)kp->arg);
1487 memcpy(&kp_local, kp, sizeof(kp_local));
1488 kp_local.arg = &value;
1490 return param_get_bool(buffer, &kp_local);
1493 static int param_set_aacompressionlevel(const char *val,
1494 const struct kernel_param *kp)
1496 int error;
1498 if (!apparmor_enabled)
1499 return -EINVAL;
1500 if (apparmor_initialized)
1501 return -EPERM;
1503 error = param_set_int(val, kp);
1505 aa_g_rawdata_compression_level = clamp(aa_g_rawdata_compression_level,
1506 Z_NO_COMPRESSION,
1507 Z_BEST_COMPRESSION);
1508 pr_info("AppArmor: policy rawdata compression level set to %u\n",
1509 aa_g_rawdata_compression_level);
1511 return error;
1514 static int param_get_aacompressionlevel(char *buffer,
1515 const struct kernel_param *kp)
1517 if (!apparmor_enabled)
1518 return -EINVAL;
1519 if (apparmor_initialized && !policy_view_capable(NULL))
1520 return -EPERM;
1521 return param_get_int(buffer, kp);
1524 static int param_get_audit(char *buffer, const struct kernel_param *kp)
1526 if (!apparmor_enabled)
1527 return -EINVAL;
1528 if (apparmor_initialized && !policy_view_capable(NULL))
1529 return -EPERM;
1530 return sprintf(buffer, "%s", audit_mode_names[aa_g_audit]);
1533 static int param_set_audit(const char *val, const struct kernel_param *kp)
1535 int i;
1537 if (!apparmor_enabled)
1538 return -EINVAL;
1539 if (!val)
1540 return -EINVAL;
1541 if (apparmor_initialized && !policy_admin_capable(NULL))
1542 return -EPERM;
1544 i = match_string(audit_mode_names, AUDIT_MAX_INDEX, val);
1545 if (i < 0)
1546 return -EINVAL;
1548 aa_g_audit = i;
1549 return 0;
1552 static int param_get_mode(char *buffer, const struct kernel_param *kp)
1554 if (!apparmor_enabled)
1555 return -EINVAL;
1556 if (apparmor_initialized && !policy_view_capable(NULL))
1557 return -EPERM;
1559 return sprintf(buffer, "%s", aa_profile_mode_names[aa_g_profile_mode]);
1562 static int param_set_mode(const char *val, const struct kernel_param *kp)
1564 int i;
1566 if (!apparmor_enabled)
1567 return -EINVAL;
1568 if (!val)
1569 return -EINVAL;
1570 if (apparmor_initialized && !policy_admin_capable(NULL))
1571 return -EPERM;
1573 i = match_string(aa_profile_mode_names, APPARMOR_MODE_NAMES_MAX_INDEX,
1574 val);
1575 if (i < 0)
1576 return -EINVAL;
1578 aa_g_profile_mode = i;
1579 return 0;
1582 char *aa_get_buffer(bool in_atomic)
1584 union aa_buffer *aa_buf;
1585 bool try_again = true;
1586 gfp_t flags = (GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOWARN);
1588 retry:
1589 spin_lock(&aa_buffers_lock);
1590 if (buffer_count > reserve_count ||
1591 (in_atomic && !list_empty(&aa_global_buffers))) {
1592 aa_buf = list_first_entry(&aa_global_buffers, union aa_buffer,
1593 list);
1594 list_del(&aa_buf->list);
1595 buffer_count--;
1596 spin_unlock(&aa_buffers_lock);
1597 return &aa_buf->buffer[0];
1599 if (in_atomic) {
1601 * out of reserve buffers and in atomic context so increase
1602 * how many buffers to keep in reserve
1604 reserve_count++;
1605 flags = GFP_ATOMIC;
1607 spin_unlock(&aa_buffers_lock);
1609 if (!in_atomic)
1610 might_sleep();
1611 aa_buf = kmalloc(aa_g_path_max, flags);
1612 if (!aa_buf) {
1613 if (try_again) {
1614 try_again = false;
1615 goto retry;
1617 pr_warn_once("AppArmor: Failed to allocate a memory buffer.\n");
1618 return NULL;
1620 return &aa_buf->buffer[0];
1623 void aa_put_buffer(char *buf)
1625 union aa_buffer *aa_buf;
1627 if (!buf)
1628 return;
1629 aa_buf = container_of(buf, union aa_buffer, buffer[0]);
1631 spin_lock(&aa_buffers_lock);
1632 list_add(&aa_buf->list, &aa_global_buffers);
1633 buffer_count++;
1634 spin_unlock(&aa_buffers_lock);
1638 * AppArmor init functions
1642 * set_init_ctx - set a task context and profile on the first task.
1644 * TODO: allow setting an alternate profile than unconfined
1646 static int __init set_init_ctx(void)
1648 struct cred *cred = (__force struct cred *)current->real_cred;
1650 set_cred_label(cred, aa_get_label(ns_unconfined(root_ns)));
1652 return 0;
1655 static void destroy_buffers(void)
1657 union aa_buffer *aa_buf;
1659 spin_lock(&aa_buffers_lock);
1660 while (!list_empty(&aa_global_buffers)) {
1661 aa_buf = list_first_entry(&aa_global_buffers, union aa_buffer,
1662 list);
1663 list_del(&aa_buf->list);
1664 spin_unlock(&aa_buffers_lock);
1665 kfree(aa_buf);
1666 spin_lock(&aa_buffers_lock);
1668 spin_unlock(&aa_buffers_lock);
1671 static int __init alloc_buffers(void)
1673 union aa_buffer *aa_buf;
1674 int i, num;
1677 * A function may require two buffers at once. Usually the buffers are
1678 * used for a short period of time and are shared. On UP kernel buffers
1679 * two should be enough, with more CPUs it is possible that more
1680 * buffers will be used simultaneously. The preallocated pool may grow.
1681 * This preallocation has also the side-effect that AppArmor will be
1682 * disabled early at boot if aa_g_path_max is extremly high.
1684 if (num_online_cpus() > 1)
1685 num = 4 + RESERVE_COUNT;
1686 else
1687 num = 2 + RESERVE_COUNT;
1689 for (i = 0; i < num; i++) {
1691 aa_buf = kmalloc(aa_g_path_max, GFP_KERNEL |
1692 __GFP_RETRY_MAYFAIL | __GFP_NOWARN);
1693 if (!aa_buf) {
1694 destroy_buffers();
1695 return -ENOMEM;
1697 aa_put_buffer(&aa_buf->buffer[0]);
1699 return 0;
1702 #ifdef CONFIG_SYSCTL
1703 static int apparmor_dointvec(struct ctl_table *table, int write,
1704 void *buffer, size_t *lenp, loff_t *ppos)
1706 if (!policy_admin_capable(NULL))
1707 return -EPERM;
1708 if (!apparmor_enabled)
1709 return -EINVAL;
1711 return proc_dointvec(table, write, buffer, lenp, ppos);
1714 static struct ctl_path apparmor_sysctl_path[] = {
1715 { .procname = "kernel", },
1719 static struct ctl_table apparmor_sysctl_table[] = {
1721 .procname = "unprivileged_userns_apparmor_policy",
1722 .data = &unprivileged_userns_apparmor_policy,
1723 .maxlen = sizeof(int),
1724 .mode = 0600,
1725 .proc_handler = apparmor_dointvec,
1730 static int __init apparmor_init_sysctl(void)
1732 return register_sysctl_paths(apparmor_sysctl_path,
1733 apparmor_sysctl_table) ? 0 : -ENOMEM;
1735 #else
1736 static inline int apparmor_init_sysctl(void)
1738 return 0;
1740 #endif /* CONFIG_SYSCTL */
1742 #if defined(CONFIG_NETFILTER) && defined(CONFIG_NETWORK_SECMARK)
1743 static unsigned int apparmor_ip_postroute(void *priv,
1744 struct sk_buff *skb,
1745 const struct nf_hook_state *state)
1747 struct aa_sk_ctx *ctx;
1748 struct sock *sk;
1750 if (!skb->secmark)
1751 return NF_ACCEPT;
1753 sk = skb_to_full_sk(skb);
1754 if (sk == NULL)
1755 return NF_ACCEPT;
1757 ctx = SK_CTX(sk);
1758 if (!apparmor_secmark_check(ctx->label, OP_SENDMSG, AA_MAY_SEND,
1759 skb->secmark, sk))
1760 return NF_ACCEPT;
1762 return NF_DROP_ERR(-ECONNREFUSED);
1766 static unsigned int apparmor_ipv4_postroute(void *priv,
1767 struct sk_buff *skb,
1768 const struct nf_hook_state *state)
1770 return apparmor_ip_postroute(priv, skb, state);
1773 #if IS_ENABLED(CONFIG_IPV6)
1774 static unsigned int apparmor_ipv6_postroute(void *priv,
1775 struct sk_buff *skb,
1776 const struct nf_hook_state *state)
1778 return apparmor_ip_postroute(priv, skb, state);
1780 #endif
1782 static const struct nf_hook_ops apparmor_nf_ops[] = {
1784 .hook = apparmor_ipv4_postroute,
1785 .pf = NFPROTO_IPV4,
1786 .hooknum = NF_INET_POST_ROUTING,
1787 .priority = NF_IP_PRI_SELINUX_FIRST,
1789 #if IS_ENABLED(CONFIG_IPV6)
1791 .hook = apparmor_ipv6_postroute,
1792 .pf = NFPROTO_IPV6,
1793 .hooknum = NF_INET_POST_ROUTING,
1794 .priority = NF_IP6_PRI_SELINUX_FIRST,
1796 #endif
1799 static int __net_init apparmor_nf_register(struct net *net)
1801 int ret;
1803 ret = nf_register_net_hooks(net, apparmor_nf_ops,
1804 ARRAY_SIZE(apparmor_nf_ops));
1805 return ret;
1808 static void __net_exit apparmor_nf_unregister(struct net *net)
1810 nf_unregister_net_hooks(net, apparmor_nf_ops,
1811 ARRAY_SIZE(apparmor_nf_ops));
1814 static struct pernet_operations apparmor_net_ops = {
1815 .init = apparmor_nf_register,
1816 .exit = apparmor_nf_unregister,
1819 static int __init apparmor_nf_ip_init(void)
1821 int err;
1823 if (!apparmor_enabled)
1824 return 0;
1826 err = register_pernet_subsys(&apparmor_net_ops);
1827 if (err)
1828 panic("Apparmor: register_pernet_subsys: error %d\n", err);
1830 return 0;
1832 __initcall(apparmor_nf_ip_init);
1833 #endif
1835 static int __init apparmor_init(void)
1837 int error;
1839 aa_secids_init();
1841 error = aa_setup_dfa_engine();
1842 if (error) {
1843 AA_ERROR("Unable to setup dfa engine\n");
1844 goto alloc_out;
1847 error = aa_alloc_root_ns();
1848 if (error) {
1849 AA_ERROR("Unable to allocate default profile namespace\n");
1850 goto alloc_out;
1853 error = apparmor_init_sysctl();
1854 if (error) {
1855 AA_ERROR("Unable to register sysctls\n");
1856 goto alloc_out;
1860 error = alloc_buffers();
1861 if (error) {
1862 AA_ERROR("Unable to allocate work buffers\n");
1863 goto alloc_out;
1866 error = set_init_ctx();
1867 if (error) {
1868 AA_ERROR("Failed to set context on init task\n");
1869 aa_free_root_ns();
1870 goto buffers_out;
1872 security_add_hooks(apparmor_hooks, ARRAY_SIZE(apparmor_hooks),
1873 "apparmor");
1875 /* Report that AppArmor successfully initialized */
1876 apparmor_initialized = 1;
1877 if (aa_g_profile_mode == APPARMOR_COMPLAIN)
1878 aa_info_message("AppArmor initialized: complain mode enabled");
1879 else if (aa_g_profile_mode == APPARMOR_KILL)
1880 aa_info_message("AppArmor initialized: kill mode enabled");
1881 else
1882 aa_info_message("AppArmor initialized");
1884 return error;
1886 buffers_out:
1887 destroy_buffers();
1888 alloc_out:
1889 aa_destroy_aafs();
1890 aa_teardown_dfa_engine();
1892 apparmor_enabled = false;
1893 return error;
1896 DEFINE_LSM(apparmor) = {
1897 .name = "apparmor",
1898 .flags = LSM_FLAG_LEGACY_MAJOR | LSM_FLAG_EXCLUSIVE,
1899 .enabled = &apparmor_enabled,
1900 .blobs = &apparmor_blob_sizes,
1901 .init = apparmor_init,