2 * AppArmor security module
4 * This file contains AppArmor /sys/kernel/security/apparmor interface functions
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/ctype.h>
16 #include <linux/security.h>
17 #include <linux/vmalloc.h>
18 #include <linux/module.h>
19 #include <linux/seq_file.h>
20 #include <linux/uaccess.h>
21 #include <linux/mount.h>
22 #include <linux/namei.h>
23 #include <linux/capability.h>
24 #include <linux/rcupdate.h>
25 #include <uapi/linux/major.h>
28 #include "include/apparmor.h"
29 #include "include/apparmorfs.h"
30 #include "include/audit.h"
31 #include "include/context.h"
32 #include "include/crypto.h"
33 #include "include/policy.h"
34 #include "include/policy_ns.h"
35 #include "include/resource.h"
36 #include "include/policy_unpack.h"
39 * aa_mangle_name - mangle a profile name to std profile layout form
40 * @name: profile name to mangle (NOT NULL)
41 * @target: buffer to store mangled name, same length as @name (MAYBE NULL)
43 * Returns: length of mangled name
45 static int mangle_name(const char *name, char *target)
49 while (*name == '/' || *name == '.')
53 for (; *name; name++) {
56 else if (isspace(*name))
58 else if (isalnum(*name) || strchr("._-", *name))
65 for (; *name; name++) {
66 if (isalnum(*name) || isspace(*name) ||
67 strchr("/._-", *name))
78 * aa_simple_write_to_buffer - common routine for getting policy from user
79 * @op: operation doing the user buffer copy
80 * @userbuf: user buffer to copy data from (NOT NULL)
81 * @alloc_size: size of user buffer (REQUIRES: @alloc_size >= @copy_size)
82 * @copy_size: size of data to copy from user buffer
83 * @pos: position write is at in the file (NOT NULL)
85 * Returns: kernel buffer containing copy of user buffer data or an
88 static struct aa_loaddata *aa_simple_write_to_buffer(const char *op,
89 const char __user *userbuf,
94 struct aa_loaddata *data;
96 BUG_ON(copy_size > alloc_size);
99 /* only writes from pos 0, that is complete writes */
100 return ERR_PTR(-ESPIPE);
102 /* freed by caller to simple_write_to_buffer */
103 data = kvmalloc(sizeof(*data) + alloc_size);
105 return ERR_PTR(-ENOMEM);
106 kref_init(&data->count);
107 data->size = copy_size;
111 if (copy_from_user(data->data, userbuf, copy_size)) {
113 return ERR_PTR(-EFAULT);
119 static ssize_t policy_update(int binop, const char __user *buf, size_t size,
120 loff_t *pos, struct aa_ns *ns)
123 struct aa_loaddata *data;
124 struct aa_profile *profile = aa_current_profile();
125 const char *op = binop == PROF_ADD ? OP_PROF_LOAD : OP_PROF_REPL;
126 /* high level check about policy management - fine grained in
129 error = aa_may_manage_policy(profile, ns, op);
133 data = aa_simple_write_to_buffer(op, buf, size, size, pos);
134 error = PTR_ERR(data);
136 error = aa_replace_profiles(ns ? ns : profile->ns, profile,
138 aa_put_loaddata(data);
144 /* .load file hook fn to load policy */
145 static ssize_t profile_load(struct file *f, const char __user *buf, size_t size,
148 struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
149 int error = policy_update(PROF_ADD, buf, size, pos, ns);
156 static const struct file_operations aa_fs_profile_load = {
157 .write = profile_load,
158 .llseek = default_llseek,
161 /* .replace file hook fn to load and/or replace policy */
162 static ssize_t profile_replace(struct file *f, const char __user *buf,
163 size_t size, loff_t *pos)
165 struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
166 int error = policy_update(PROF_REPLACE, buf, size, pos, ns);
173 static const struct file_operations aa_fs_profile_replace = {
174 .write = profile_replace,
175 .llseek = default_llseek,
178 /* .remove file hook fn to remove loaded policy */
179 static ssize_t profile_remove(struct file *f, const char __user *buf,
180 size_t size, loff_t *pos)
182 struct aa_loaddata *data;
183 struct aa_profile *profile;
185 struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
187 profile = aa_current_profile();
188 /* high level check about policy management - fine grained in
191 error = aa_may_manage_policy(profile, ns, OP_PROF_RM);
196 * aa_remove_profile needs a null terminated string so 1 extra
197 * byte is allocated and the copied data is null terminated.
199 data = aa_simple_write_to_buffer(OP_PROF_RM, buf, size + 1, size,
202 error = PTR_ERR(data);
204 data->data[size] = 0;
205 error = aa_remove_profiles(ns ? ns : profile->ns, profile,
207 aa_put_loaddata(data);
214 static const struct file_operations aa_fs_profile_remove = {
215 .write = profile_remove,
216 .llseek = default_llseek,
219 static int aa_fs_seq_show(struct seq_file *seq, void *v)
221 struct aa_fs_entry *fs_file = seq->private;
226 switch (fs_file->v_type) {
227 case AA_FS_TYPE_BOOLEAN:
228 seq_printf(seq, "%s\n", fs_file->v.boolean ? "yes" : "no");
230 case AA_FS_TYPE_STRING:
231 seq_printf(seq, "%s\n", fs_file->v.string);
234 seq_printf(seq, "%#08lx\n", fs_file->v.u64);
237 /* Ignore unpritable entry types. */
244 static int aa_fs_seq_open(struct inode *inode, struct file *file)
246 return single_open(file, aa_fs_seq_show, inode->i_private);
249 const struct file_operations aa_fs_seq_file_ops = {
250 .owner = THIS_MODULE,
251 .open = aa_fs_seq_open,
254 .release = single_release,
257 static int aa_fs_seq_profile_open(struct inode *inode, struct file *file,
258 int (*show)(struct seq_file *, void *))
260 struct aa_proxy *proxy = aa_get_proxy(inode->i_private);
261 int error = single_open(file, show, proxy);
264 file->private_data = NULL;
271 static int aa_fs_seq_profile_release(struct inode *inode, struct file *file)
273 struct seq_file *seq = (struct seq_file *) file->private_data;
275 aa_put_proxy(seq->private);
276 return single_release(inode, file);
279 static int aa_fs_seq_profname_show(struct seq_file *seq, void *v)
281 struct aa_proxy *proxy = seq->private;
282 struct aa_profile *profile = aa_get_profile_rcu(&proxy->profile);
283 seq_printf(seq, "%s\n", profile->base.name);
284 aa_put_profile(profile);
289 static int aa_fs_seq_profname_open(struct inode *inode, struct file *file)
291 return aa_fs_seq_profile_open(inode, file, aa_fs_seq_profname_show);
294 static const struct file_operations aa_fs_profname_fops = {
295 .owner = THIS_MODULE,
296 .open = aa_fs_seq_profname_open,
299 .release = aa_fs_seq_profile_release,
302 static int aa_fs_seq_profmode_show(struct seq_file *seq, void *v)
304 struct aa_proxy *proxy = seq->private;
305 struct aa_profile *profile = aa_get_profile_rcu(&proxy->profile);
306 seq_printf(seq, "%s\n", aa_profile_mode_names[profile->mode]);
307 aa_put_profile(profile);
312 static int aa_fs_seq_profmode_open(struct inode *inode, struct file *file)
314 return aa_fs_seq_profile_open(inode, file, aa_fs_seq_profmode_show);
317 static const struct file_operations aa_fs_profmode_fops = {
318 .owner = THIS_MODULE,
319 .open = aa_fs_seq_profmode_open,
322 .release = aa_fs_seq_profile_release,
325 static int aa_fs_seq_profattach_show(struct seq_file *seq, void *v)
327 struct aa_proxy *proxy = seq->private;
328 struct aa_profile *profile = aa_get_profile_rcu(&proxy->profile);
330 seq_printf(seq, "%s\n", profile->attach);
331 else if (profile->xmatch)
332 seq_puts(seq, "<unknown>\n");
334 seq_printf(seq, "%s\n", profile->base.name);
335 aa_put_profile(profile);
340 static int aa_fs_seq_profattach_open(struct inode *inode, struct file *file)
342 return aa_fs_seq_profile_open(inode, file, aa_fs_seq_profattach_show);
345 static const struct file_operations aa_fs_profattach_fops = {
346 .owner = THIS_MODULE,
347 .open = aa_fs_seq_profattach_open,
350 .release = aa_fs_seq_profile_release,
353 static int aa_fs_seq_hash_show(struct seq_file *seq, void *v)
355 struct aa_proxy *proxy = seq->private;
356 struct aa_profile *profile = aa_get_profile_rcu(&proxy->profile);
357 unsigned int i, size = aa_hash_size();
360 for (i = 0; i < size; i++)
361 seq_printf(seq, "%.2x", profile->hash[i]);
364 aa_put_profile(profile);
369 static int aa_fs_seq_hash_open(struct inode *inode, struct file *file)
371 return single_open(file, aa_fs_seq_hash_show, inode->i_private);
374 static const struct file_operations aa_fs_seq_hash_fops = {
375 .owner = THIS_MODULE,
376 .open = aa_fs_seq_hash_open,
379 .release = single_release,
383 static int aa_fs_seq_show_ns_level(struct seq_file *seq, void *v)
385 struct aa_ns *ns = aa_current_profile()->ns;
387 seq_printf(seq, "%d\n", ns->level);
392 static int aa_fs_seq_open_ns_level(struct inode *inode, struct file *file)
394 return single_open(file, aa_fs_seq_show_ns_level, inode->i_private);
397 static const struct file_operations aa_fs_ns_level = {
398 .owner = THIS_MODULE,
399 .open = aa_fs_seq_open_ns_level,
402 .release = single_release,
405 static int aa_fs_seq_show_ns_name(struct seq_file *seq, void *v)
407 struct aa_ns *ns = aa_current_profile()->ns;
409 seq_printf(seq, "%s\n", ns->base.name);
414 static int aa_fs_seq_open_ns_name(struct inode *inode, struct file *file)
416 return single_open(file, aa_fs_seq_show_ns_name, inode->i_private);
419 static const struct file_operations aa_fs_ns_name = {
420 .owner = THIS_MODULE,
421 .open = aa_fs_seq_open_ns_name,
424 .release = single_release,
427 static int rawdata_release(struct inode *inode, struct file *file)
429 /* TODO: switch to loaddata when profile switched to symlink */
430 aa_put_loaddata(file->private_data);
435 static int aa_fs_seq_raw_abi_show(struct seq_file *seq, void *v)
437 struct aa_proxy *proxy = seq->private;
438 struct aa_profile *profile = aa_get_profile_rcu(&proxy->profile);
440 if (profile->rawdata->abi) {
441 seq_printf(seq, "v%d", profile->rawdata->abi);
444 aa_put_profile(profile);
449 static int aa_fs_seq_raw_abi_open(struct inode *inode, struct file *file)
451 return aa_fs_seq_profile_open(inode, file, aa_fs_seq_raw_abi_show);
454 static const struct file_operations aa_fs_seq_raw_abi_fops = {
455 .owner = THIS_MODULE,
456 .open = aa_fs_seq_raw_abi_open,
459 .release = aa_fs_seq_profile_release,
462 static int aa_fs_seq_raw_hash_show(struct seq_file *seq, void *v)
464 struct aa_proxy *proxy = seq->private;
465 struct aa_profile *profile = aa_get_profile_rcu(&proxy->profile);
466 unsigned int i, size = aa_hash_size();
468 if (profile->rawdata->hash) {
469 for (i = 0; i < size; i++)
470 seq_printf(seq, "%.2x", profile->rawdata->hash[i]);
473 aa_put_profile(profile);
478 static int aa_fs_seq_raw_hash_open(struct inode *inode, struct file *file)
480 return aa_fs_seq_profile_open(inode, file, aa_fs_seq_raw_hash_show);
483 static const struct file_operations aa_fs_seq_raw_hash_fops = {
484 .owner = THIS_MODULE,
485 .open = aa_fs_seq_raw_hash_open,
488 .release = aa_fs_seq_profile_release,
491 static ssize_t rawdata_read(struct file *file, char __user *buf, size_t size,
494 struct aa_loaddata *rawdata = file->private_data;
496 return simple_read_from_buffer(buf, size, ppos, rawdata->data,
500 static int rawdata_open(struct inode *inode, struct file *file)
502 struct aa_proxy *proxy = inode->i_private;
503 struct aa_profile *profile;
505 if (!policy_view_capable(NULL))
507 profile = aa_get_profile_rcu(&proxy->profile);
508 file->private_data = aa_get_loaddata(profile->rawdata);
509 aa_put_profile(profile);
514 static const struct file_operations aa_fs_rawdata_fops = {
515 .open = rawdata_open,
516 .read = rawdata_read,
517 .llseek = generic_file_llseek,
518 .release = rawdata_release,
521 /** fns to setup dynamic per profile/namespace files **/
522 void __aa_fs_profile_rmdir(struct aa_profile *profile)
524 struct aa_profile *child;
530 list_for_each_entry(child, &profile->base.profiles, base.list)
531 __aa_fs_profile_rmdir(child);
533 for (i = AAFS_PROF_SIZEOF - 1; i >= 0; --i) {
534 struct aa_proxy *proxy;
535 if (!profile->dents[i])
538 proxy = d_inode(profile->dents[i])->i_private;
539 securityfs_remove(profile->dents[i]);
541 profile->dents[i] = NULL;
545 void __aa_fs_profile_migrate_dents(struct aa_profile *old,
546 struct aa_profile *new)
550 for (i = 0; i < AAFS_PROF_SIZEOF; i++) {
551 new->dents[i] = old->dents[i];
553 new->dents[i]->d_inode->i_mtime = current_time(new->dents[i]->d_inode);
554 old->dents[i] = NULL;
558 static struct dentry *create_profile_file(struct dentry *dir, const char *name,
559 struct aa_profile *profile,
560 const struct file_operations *fops)
562 struct aa_proxy *proxy = aa_get_proxy(profile->proxy);
565 dent = securityfs_create_file(name, S_IFREG | 0444, dir, proxy, fops);
572 /* requires lock be held */
573 int __aa_fs_profile_mkdir(struct aa_profile *profile, struct dentry *parent)
575 struct aa_profile *child;
576 struct dentry *dent = NULL, *dir;
580 struct aa_profile *p;
581 p = aa_deref_parent(profile);
583 /* adding to parent that previously didn't have children */
584 dent = securityfs_create_dir("profiles", dent);
587 prof_child_dir(p) = parent = dent;
590 if (!profile->dirname) {
592 len = mangle_name(profile->base.name, NULL);
593 id_len = snprintf(NULL, 0, ".%ld", profile->ns->uniq_id);
595 profile->dirname = kmalloc(len + id_len + 1, GFP_KERNEL);
596 if (!profile->dirname)
599 mangle_name(profile->base.name, profile->dirname);
600 sprintf(profile->dirname + len, ".%ld", profile->ns->uniq_id++);
603 dent = securityfs_create_dir(profile->dirname, parent);
606 prof_dir(profile) = dir = dent;
608 dent = create_profile_file(dir, "name", profile, &aa_fs_profname_fops);
611 profile->dents[AAFS_PROF_NAME] = dent;
613 dent = create_profile_file(dir, "mode", profile, &aa_fs_profmode_fops);
616 profile->dents[AAFS_PROF_MODE] = dent;
618 dent = create_profile_file(dir, "attach", profile,
619 &aa_fs_profattach_fops);
622 profile->dents[AAFS_PROF_ATTACH] = dent;
625 dent = create_profile_file(dir, "sha1", profile,
626 &aa_fs_seq_hash_fops);
629 profile->dents[AAFS_PROF_HASH] = dent;
632 if (profile->rawdata) {
633 dent = create_profile_file(dir, "raw_sha1", profile,
634 &aa_fs_seq_raw_hash_fops);
637 profile->dents[AAFS_PROF_RAW_HASH] = dent;
639 dent = create_profile_file(dir, "raw_abi", profile,
640 &aa_fs_seq_raw_abi_fops);
643 profile->dents[AAFS_PROF_RAW_ABI] = dent;
645 dent = securityfs_create_file("raw_data", S_IFREG | 0444, dir,
647 &aa_fs_rawdata_fops);
650 profile->dents[AAFS_PROF_RAW_DATA] = dent;
651 d_inode(dent)->i_size = profile->rawdata->size;
652 aa_get_proxy(profile->proxy);
655 list_for_each_entry(child, &profile->base.profiles, base.list) {
656 error = __aa_fs_profile_mkdir(child, prof_child_dir(profile));
664 error = PTR_ERR(dent);
667 __aa_fs_profile_rmdir(profile);
672 void __aa_fs_ns_rmdir(struct aa_ns *ns)
675 struct aa_profile *child;
681 list_for_each_entry(child, &ns->base.profiles, base.list)
682 __aa_fs_profile_rmdir(child);
684 list_for_each_entry(sub, &ns->sub_ns, base.list) {
685 mutex_lock(&sub->lock);
686 __aa_fs_ns_rmdir(sub);
687 mutex_unlock(&sub->lock);
690 if (ns_subns_dir(ns)) {
691 sub = d_inode(ns_subns_dir(ns))->i_private;
694 if (ns_subload(ns)) {
695 sub = d_inode(ns_subload(ns))->i_private;
698 if (ns_subreplace(ns)) {
699 sub = d_inode(ns_subreplace(ns))->i_private;
702 if (ns_subremove(ns)) {
703 sub = d_inode(ns_subremove(ns))->i_private;
707 for (i = AAFS_NS_SIZEOF - 1; i >= 0; --i) {
708 securityfs_remove(ns->dents[i]);
713 /* assumes cleanup in caller */
714 static int __aa_fs_ns_mkdir_entries(struct aa_ns *ns, struct dentry *dir)
721 dent = securityfs_create_dir("profiles", dir);
723 return PTR_ERR(dent);
724 ns_subprofs_dir(ns) = dent;
726 dent = securityfs_create_dir("raw_data", dir);
728 return PTR_ERR(dent);
729 ns_subdata_dir(ns) = dent;
731 dent = securityfs_create_file(".load", 0640, dir, ns,
732 &aa_fs_profile_load);
734 return PTR_ERR(dent);
736 ns_subload(ns) = dent;
738 dent = securityfs_create_file(".replace", 0640, dir, ns,
739 &aa_fs_profile_replace);
741 return PTR_ERR(dent);
743 ns_subreplace(ns) = dent;
745 dent = securityfs_create_file(".remove", 0640, dir, ns,
746 &aa_fs_profile_remove);
748 return PTR_ERR(dent);
750 ns_subremove(ns) = dent;
752 dent = securityfs_create_dir("namespaces", dir);
754 return PTR_ERR(dent);
756 ns_subns_dir(ns) = dent;
761 int __aa_fs_ns_mkdir(struct aa_ns *ns, struct dentry *parent, const char *name)
764 struct aa_profile *child;
765 struct dentry *dent, *dir;
770 AA_BUG(!mutex_is_locked(&ns->lock));
773 name = ns->base.name;
775 /* create ns dir if it doesn't already exist */
776 dent = securityfs_create_dir(name, parent);
780 ns_dir(ns) = dir = dent;
781 error = __aa_fs_ns_mkdir_entries(ns, dir);
786 list_for_each_entry(child, &ns->base.profiles, base.list) {
787 error = __aa_fs_profile_mkdir(child, ns_subprofs_dir(ns));
793 list_for_each_entry(sub, &ns->sub_ns, base.list) {
794 mutex_lock(&sub->lock);
795 error = __aa_fs_ns_mkdir(sub, ns_subns_dir(ns), NULL);
796 mutex_unlock(&sub->lock);
804 error = PTR_ERR(dent);
807 __aa_fs_ns_rmdir(ns);
813 #define list_entry_is_head(pos, head, member) (&pos->member == (head))
816 * __next_ns - find the next namespace to list
817 * @root: root namespace to stop search at (NOT NULL)
818 * @ns: current ns position (NOT NULL)
820 * Find the next namespace from @ns under @root and handle all locking needed
821 * while switching current namespace.
823 * Returns: next namespace or NULL if at last namespace under @root
824 * Requires: ns->parent->lock to be held
825 * NOTE: will not unlock root->lock
827 static struct aa_ns *__next_ns(struct aa_ns *root, struct aa_ns *ns)
829 struct aa_ns *parent, *next;
831 /* is next namespace a child */
832 if (!list_empty(&ns->sub_ns)) {
833 next = list_first_entry(&ns->sub_ns, typeof(*ns), base.list);
834 mutex_lock(&next->lock);
838 /* check if the next ns is a sibling, parent, gp, .. */
841 mutex_unlock(&ns->lock);
842 next = list_next_entry(ns, base.list);
843 if (!list_entry_is_head(next, &parent->sub_ns, base.list)) {
844 mutex_lock(&next->lock);
848 parent = parent->parent;
855 * __first_profile - find the first profile in a namespace
856 * @root: namespace that is root of profiles being displayed (NOT NULL)
857 * @ns: namespace to start in (NOT NULL)
859 * Returns: unrefcounted profile or NULL if no profile
860 * Requires: profile->ns.lock to be held
862 static struct aa_profile *__first_profile(struct aa_ns *root,
865 for (; ns; ns = __next_ns(root, ns)) {
866 if (!list_empty(&ns->base.profiles))
867 return list_first_entry(&ns->base.profiles,
868 struct aa_profile, base.list);
874 * __next_profile - step to the next profile in a profile tree
875 * @profile: current profile in tree (NOT NULL)
877 * Perform a depth first traversal on the profile tree in a namespace
879 * Returns: next profile or NULL if done
880 * Requires: profile->ns.lock to be held
882 static struct aa_profile *__next_profile(struct aa_profile *p)
884 struct aa_profile *parent;
885 struct aa_ns *ns = p->ns;
887 /* is next profile a child */
888 if (!list_empty(&p->base.profiles))
889 return list_first_entry(&p->base.profiles, typeof(*p),
892 /* is next profile a sibling, parent sibling, gp, sibling, .. */
893 parent = rcu_dereference_protected(p->parent,
894 mutex_is_locked(&p->ns->lock));
896 p = list_next_entry(p, base.list);
897 if (!list_entry_is_head(p, &parent->base.profiles, base.list))
900 parent = rcu_dereference_protected(parent->parent,
901 mutex_is_locked(&parent->ns->lock));
904 /* is next another profile in the namespace */
905 p = list_next_entry(p, base.list);
906 if (!list_entry_is_head(p, &ns->base.profiles, base.list))
913 * next_profile - step to the next profile in where ever it may be
914 * @root: root namespace (NOT NULL)
915 * @profile: current profile (NOT NULL)
917 * Returns: next profile or NULL if there isn't one
919 static struct aa_profile *next_profile(struct aa_ns *root,
920 struct aa_profile *profile)
922 struct aa_profile *next = __next_profile(profile);
926 /* finished all profiles in namespace move to next namespace */
927 return __first_profile(root, __next_ns(root, profile->ns));
931 * p_start - start a depth first traversal of profile tree
932 * @f: seq_file to fill
933 * @pos: current position
935 * Returns: first profile under current namespace or NULL if none found
937 * acquires first ns->lock
939 static void *p_start(struct seq_file *f, loff_t *pos)
941 struct aa_profile *profile = NULL;
942 struct aa_ns *root = aa_current_profile()->ns;
944 f->private = aa_get_ns(root);
947 /* find the first profile */
948 mutex_lock(&root->lock);
949 profile = __first_profile(root, root);
951 /* skip to position */
952 for (; profile && l > 0; l--)
953 profile = next_profile(root, profile);
959 * p_next - read the next profile entry
960 * @f: seq_file to fill
961 * @p: profile previously returned
962 * @pos: current position
964 * Returns: next profile after @p or NULL if none
966 * may acquire/release locks in namespace tree as necessary
968 static void *p_next(struct seq_file *f, void *p, loff_t *pos)
970 struct aa_profile *profile = p;
971 struct aa_ns *ns = f->private;
974 return next_profile(ns, profile);
978 * p_stop - stop depth first traversal
979 * @f: seq_file we are filling
980 * @p: the last profile writen
982 * Release all locking done by p_start/p_next on namespace tree
984 static void p_stop(struct seq_file *f, void *p)
986 struct aa_profile *profile = p;
987 struct aa_ns *root = f->private, *ns;
990 for (ns = profile->ns; ns && ns != root; ns = ns->parent)
991 mutex_unlock(&ns->lock);
993 mutex_unlock(&root->lock);
998 * seq_show_profile - show a profile entry
999 * @f: seq_file to file
1000 * @p: current position (profile) (NOT NULL)
1002 * Returns: error on failure
1004 static int seq_show_profile(struct seq_file *f, void *p)
1006 struct aa_profile *profile = (struct aa_profile *)p;
1007 struct aa_ns *root = f->private;
1009 if (profile->ns != root)
1010 seq_printf(f, ":%s://", aa_ns_name(root, profile->ns, true));
1011 seq_printf(f, "%s (%s)\n", profile->base.hname,
1012 aa_profile_mode_names[profile->mode]);
1017 static const struct seq_operations aa_fs_profiles_op = {
1021 .show = seq_show_profile,
1024 static int profiles_open(struct inode *inode, struct file *file)
1026 if (!policy_view_capable(NULL))
1029 return seq_open(file, &aa_fs_profiles_op);
1032 static int profiles_release(struct inode *inode, struct file *file)
1034 return seq_release(inode, file);
1037 static const struct file_operations aa_fs_profiles_fops = {
1038 .open = profiles_open,
1040 .llseek = seq_lseek,
1041 .release = profiles_release,
1045 /** Base file system setup **/
1046 static struct aa_fs_entry aa_fs_entry_file[] = {
1047 AA_FS_FILE_STRING("mask", "create read write exec append mmap_exec " \
1052 static struct aa_fs_entry aa_fs_entry_domain[] = {
1053 AA_FS_FILE_BOOLEAN("change_hat", 1),
1054 AA_FS_FILE_BOOLEAN("change_hatv", 1),
1055 AA_FS_FILE_BOOLEAN("change_onexec", 1),
1056 AA_FS_FILE_BOOLEAN("change_profile", 1),
1057 AA_FS_FILE_BOOLEAN("fix_binfmt_elf_mmap", 1),
1061 static struct aa_fs_entry aa_fs_entry_versions[] = {
1062 AA_FS_FILE_BOOLEAN("v5", 1),
1066 static struct aa_fs_entry aa_fs_entry_policy[] = {
1067 AA_FS_DIR("versions", aa_fs_entry_versions),
1068 AA_FS_FILE_BOOLEAN("set_load", 1),
1072 static struct aa_fs_entry aa_fs_entry_features[] = {
1073 AA_FS_DIR("policy", aa_fs_entry_policy),
1074 AA_FS_DIR("domain", aa_fs_entry_domain),
1075 AA_FS_DIR("file", aa_fs_entry_file),
1076 AA_FS_FILE_U64("capability", VFS_CAP_FLAGS_MASK),
1077 AA_FS_DIR("rlimit", aa_fs_entry_rlimit),
1078 AA_FS_DIR("caps", aa_fs_entry_caps),
1082 static struct aa_fs_entry aa_fs_entry_apparmor[] = {
1083 AA_FS_FILE_FOPS(".ns_level", 0666, &aa_fs_ns_level),
1084 AA_FS_FILE_FOPS(".ns_name", 0640, &aa_fs_ns_name),
1085 AA_FS_FILE_FOPS("profiles", 0440, &aa_fs_profiles_fops),
1086 AA_FS_DIR("features", aa_fs_entry_features),
1090 static struct aa_fs_entry aa_fs_entry =
1091 AA_FS_DIR("apparmor", aa_fs_entry_apparmor);
1094 * aafs_create_file - create a file entry in the apparmor securityfs
1095 * @fs_file: aa_fs_entry to build an entry for (NOT NULL)
1096 * @parent: the parent dentry in the securityfs
1098 * Use aafs_remove_file to remove entries created with this fn.
1100 static int __init aafs_create_file(struct aa_fs_entry *fs_file,
1101 struct dentry *parent)
1105 fs_file->dentry = securityfs_create_file(fs_file->name,
1106 S_IFREG | fs_file->mode,
1109 if (IS_ERR(fs_file->dentry)) {
1110 error = PTR_ERR(fs_file->dentry);
1111 fs_file->dentry = NULL;
1116 static void __init aafs_remove_dir(struct aa_fs_entry *fs_dir);
1118 * aafs_create_dir - recursively create a directory entry in the securityfs
1119 * @fs_dir: aa_fs_entry (and all child entries) to build (NOT NULL)
1120 * @parent: the parent dentry in the securityfs
1122 * Use aafs_remove_dir to remove entries created with this fn.
1124 static int __init aafs_create_dir(struct aa_fs_entry *fs_dir,
1125 struct dentry *parent)
1127 struct aa_fs_entry *fs_file;
1131 dir = securityfs_create_dir(fs_dir->name, parent);
1133 return PTR_ERR(dir);
1134 fs_dir->dentry = dir;
1136 for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) {
1137 if (fs_file->v_type == AA_FS_TYPE_DIR)
1138 error = aafs_create_dir(fs_file, fs_dir->dentry);
1140 error = aafs_create_file(fs_file, fs_dir->dentry);
1148 aafs_remove_dir(fs_dir);
1154 * aafs_remove_file - drop a single file entry in the apparmor securityfs
1155 * @fs_file: aa_fs_entry to detach from the securityfs (NOT NULL)
1157 static void __init aafs_remove_file(struct aa_fs_entry *fs_file)
1159 if (!fs_file->dentry)
1162 securityfs_remove(fs_file->dentry);
1163 fs_file->dentry = NULL;
1167 * aafs_remove_dir - recursively drop a directory entry from the securityfs
1168 * @fs_dir: aa_fs_entry (and all child entries) to detach (NOT NULL)
1170 static void __init aafs_remove_dir(struct aa_fs_entry *fs_dir)
1172 struct aa_fs_entry *fs_file;
1174 for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) {
1175 if (fs_file->v_type == AA_FS_TYPE_DIR)
1176 aafs_remove_dir(fs_file);
1178 aafs_remove_file(fs_file);
1181 aafs_remove_file(fs_dir);
1185 * aa_destroy_aafs - cleanup and free aafs
1187 * releases dentries allocated by aa_create_aafs
1189 void __init aa_destroy_aafs(void)
1191 aafs_remove_dir(&aa_fs_entry);
1195 #define NULL_FILE_NAME ".null"
1196 struct path aa_null;
1198 static int aa_mk_null_file(struct dentry *parent)
1200 struct vfsmount *mount = NULL;
1201 struct dentry *dentry;
1202 struct inode *inode;
1204 int error = simple_pin_fs(parent->d_sb->s_type, &mount, &count);
1209 inode_lock(d_inode(parent));
1210 dentry = lookup_one_len(NULL_FILE_NAME, parent, strlen(NULL_FILE_NAME));
1211 if (IS_ERR(dentry)) {
1212 error = PTR_ERR(dentry);
1215 inode = new_inode(parent->d_inode->i_sb);
1221 inode->i_ino = get_next_ino();
1222 inode->i_mode = S_IFCHR | S_IRUGO | S_IWUGO;
1223 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
1224 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO,
1225 MKDEV(MEM_MAJOR, 3));
1226 d_instantiate(dentry, inode);
1227 aa_null.dentry = dget(dentry);
1228 aa_null.mnt = mntget(mount);
1235 inode_unlock(d_inode(parent));
1236 simple_release_fs(&mount, &count);
1241 * aa_create_aafs - create the apparmor security filesystem
1243 * dentries created here are released by aa_destroy_aafs
1245 * Returns: error on failure
1247 static int __init aa_create_aafs(void)
1249 struct dentry *dent;
1252 if (!apparmor_initialized)
1255 if (aa_fs_entry.dentry) {
1256 AA_ERROR("%s: AppArmor securityfs already exists\n", __func__);
1260 /* Populate fs tree. */
1261 error = aafs_create_dir(&aa_fs_entry, NULL);
1265 dent = securityfs_create_file(".load", 0666, aa_fs_entry.dentry,
1266 NULL, &aa_fs_profile_load);
1268 error = PTR_ERR(dent);
1271 ns_subload(root_ns) = dent;
1273 dent = securityfs_create_file(".replace", 0666, aa_fs_entry.dentry,
1274 NULL, &aa_fs_profile_replace);
1276 error = PTR_ERR(dent);
1279 ns_subreplace(root_ns) = dent;
1281 dent = securityfs_create_file(".remove", 0666, aa_fs_entry.dentry,
1282 NULL, &aa_fs_profile_remove);
1284 error = PTR_ERR(dent);
1287 ns_subremove(root_ns) = dent;
1289 mutex_lock(&root_ns->lock);
1290 error = __aa_fs_ns_mkdir(root_ns, aa_fs_entry.dentry, "policy");
1291 mutex_unlock(&root_ns->lock);
1296 error = aa_mk_null_file(aa_fs_entry.dentry);
1300 /* TODO: add default profile to apparmorfs */
1302 /* Report that AppArmor fs is enabled */
1303 aa_info_message("AppArmor Filesystem Enabled");
1308 AA_ERROR("Error creating AppArmor securityfs\n");
1312 fs_initcall(aa_create_aafs);