1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * AppArmor security module
   4 *
   5 * This file contains AppArmor /sys/kernel/security/apparmor interface functions
   6 *
   7 * Copyright (C) 1998-2008 Novell/SUSE
   8 * Copyright 2009-2010 Canonical Ltd.
   9 */
  10
  11#include <linux/ctype.h>
  12#include <linux/security.h>
  13#include <linux/vmalloc.h>
  14#include <linux/init.h>
  15#include <linux/seq_file.h>
  16#include <linux/uaccess.h>
  17#include <linux/mount.h>
  18#include <linux/namei.h>
  19#include <linux/capability.h>
  20#include <linux/rcupdate.h>
  21#include <linux/fs.h>
  22#include <linux/fs_context.h>
  23#include <linux/poll.h>
 
  24#include <uapi/linux/major.h>
  25#include <uapi/linux/magic.h>
  26
  27#include "include/apparmor.h"
  28#include "include/apparmorfs.h"
  29#include "include/audit.h"
  30#include "include/cred.h"
  31#include "include/crypto.h"
  32#include "include/ipc.h"
  33#include "include/label.h"
  34#include "include/policy.h"
  35#include "include/policy_ns.h"
  36#include "include/resource.h"
  37#include "include/policy_unpack.h"
 
  38
  39/*
  40 * The apparmor filesystem interface used for policy load and introspection
  41 * The interface is split into two main components based on their function
  42 * a securityfs component:
  43 *   used for static files that are always available, and which allows
  44 *   userspace to specificy the location of the security filesystem.
  45 *
  46 *   fns and data are prefixed with
  47 *      aa_sfs_
  48 *
  49 * an apparmorfs component:
  50 *   used loaded policy content and introspection. It is not part of  a
  51 *   regular mounted filesystem and is available only through the magic
  52 *   policy symlink in the root of the securityfs apparmor/ directory.
  53 *   Tasks queries will be magically redirected to the correct portion
  54 *   of the policy tree based on their confinement.
  55 *
  56 *   fns and data are prefixed with
  57 *      aafs_
  58 *
  59 * The aa_fs_ prefix is used to indicate the fn is used by both the
  60 * securityfs and apparmorfs filesystems.
  61 */
  62
  63
  64/*
  65 * support fns
  66 */
  67
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  68/**
  69 * aa_mangle_name - mangle a profile name to std profile layout form
  70 * @name: profile name to mangle  (NOT NULL)
  71 * @target: buffer to store mangled name, same length as @name (MAYBE NULL)
  72 *
  73 * Returns: length of mangled name
  74 */
  75static int mangle_name(const char *name, char *target)
  76{
  77	char *t = target;
  78
  79	while (*name == '/' || *name == '.')
  80		name++;
  81
  82	if (target) {
  83		for (; *name; name++) {
  84			if (*name == '/')
  85				*(t)++ = '.';
  86			else if (isspace(*name))
  87				*(t)++ = '_';
  88			else if (isalnum(*name) || strchr("._-", *name))
  89				*(t)++ = *name;
  90		}
  91
  92		*t = 0;
  93	} else {
  94		int len = 0;
  95		for (; *name; name++) {
  96			if (isalnum(*name) || isspace(*name) ||
  97			    strchr("/._-", *name))
  98				len++;
  99		}
 100
 101		return len;
 102	}
 103
 104	return t - target;
 105}
 106
 107
 108/*
 109 * aafs - core fns and data for the policy tree
 110 */
 111
 112#define AAFS_NAME		"apparmorfs"
 113static struct vfsmount *aafs_mnt;
 114static int aafs_count;
 115
 116
 117static int aafs_show_path(struct seq_file *seq, struct dentry *dentry)
 118{
 119	seq_printf(seq, "%s:[%lu]", AAFS_NAME, d_inode(dentry)->i_ino);
 120	return 0;
 121}
 122
 123static void aafs_free_inode(struct inode *inode)
 124{
 125	if (S_ISLNK(inode->i_mode))
 126		kfree(inode->i_link);
 127	free_inode_nonrcu(inode);
 128}
 129
 130static const struct super_operations aafs_super_ops = {
 131	.statfs = simple_statfs,
 132	.free_inode = aafs_free_inode,
 133	.show_path = aafs_show_path,
 134};
 135
 136static int apparmorfs_fill_super(struct super_block *sb, struct fs_context *fc)
 137{
 138	static struct tree_descr files[] = { {""} };
 139	int error;
 140
 141	error = simple_fill_super(sb, AAFS_MAGIC, files);
 142	if (error)
 143		return error;
 144	sb->s_op = &aafs_super_ops;
 145
 146	return 0;
 147}
 148
 149static int apparmorfs_get_tree(struct fs_context *fc)
 150{
 151	return get_tree_single(fc, apparmorfs_fill_super);
 152}
 153
 154static const struct fs_context_operations apparmorfs_context_ops = {
 155	.get_tree	= apparmorfs_get_tree,
 156};
 157
 158static int apparmorfs_init_fs_context(struct fs_context *fc)
 159{
 160	fc->ops = &apparmorfs_context_ops;
 161	return 0;
 162}
 163
 164static struct file_system_type aafs_ops = {
 165	.owner = THIS_MODULE,
 166	.name = AAFS_NAME,
 167	.init_fs_context = apparmorfs_init_fs_context,
 168	.kill_sb = kill_anon_super,
 169};
 170
 171/**
 172 * __aafs_setup_d_inode - basic inode setup for apparmorfs
 173 * @dir: parent directory for the dentry
 174 * @dentry: dentry we are seting the inode up for
 175 * @mode: permissions the file should have
 176 * @data: data to store on inode.i_private, available in open()
 177 * @link: if symlink, symlink target string
 178 * @fops: struct file_operations that should be used
 179 * @iops: struct of inode_operations that should be used
 180 */
 181static int __aafs_setup_d_inode(struct inode *dir, struct dentry *dentry,
 182			       umode_t mode, void *data, char *link,
 183			       const struct file_operations *fops,
 184			       const struct inode_operations *iops)
 185{
 186	struct inode *inode = new_inode(dir->i_sb);
 187
 188	AA_BUG(!dir);
 189	AA_BUG(!dentry);
 190
 191	if (!inode)
 192		return -ENOMEM;
 193
 194	inode->i_ino = get_next_ino();
 195	inode->i_mode = mode;
 196	inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
 197	inode->i_private = data;
 198	if (S_ISDIR(mode)) {
 199		inode->i_op = iops ? iops : &simple_dir_inode_operations;
 200		inode->i_fop = &simple_dir_operations;
 201		inc_nlink(inode);
 202		inc_nlink(dir);
 203	} else if (S_ISLNK(mode)) {
 204		inode->i_op = iops ? iops : &simple_symlink_inode_operations;
 205		inode->i_link = link;
 206	} else {
 207		inode->i_fop = fops;
 208	}
 209	d_instantiate(dentry, inode);
 210	dget(dentry);
 211
 212	return 0;
 213}
 214
 215/**
 216 * aafs_create - create a dentry in the apparmorfs filesystem
 217 *
 218 * @name: name of dentry to create
 219 * @mode: permissions the file should have
 220 * @parent: parent directory for this dentry
 221 * @data: data to store on inode.i_private, available in open()
 222 * @link: if symlink, symlink target string
 223 * @fops: struct file_operations that should be used for
 224 * @iops: struct of inode_operations that should be used
 225 *
 226 * This is the basic "create a xxx" function for apparmorfs.
 227 *
 228 * Returns a pointer to a dentry if it succeeds, that must be free with
 229 * aafs_remove(). Will return ERR_PTR on failure.
 230 */
 231static struct dentry *aafs_create(const char *name, umode_t mode,
 232				  struct dentry *parent, void *data, void *link,
 233				  const struct file_operations *fops,
 234				  const struct inode_operations *iops)
 235{
 236	struct dentry *dentry;
 237	struct inode *dir;
 238	int error;
 239
 240	AA_BUG(!name);
 241	AA_BUG(!parent);
 242
 243	if (!(mode & S_IFMT))
 244		mode = (mode & S_IALLUGO) | S_IFREG;
 245
 246	error = simple_pin_fs(&aafs_ops, &aafs_mnt, &aafs_count);
 247	if (error)
 248		return ERR_PTR(error);
 249
 250	dir = d_inode(parent);
 251
 252	inode_lock(dir);
 253	dentry = lookup_one_len(name, parent, strlen(name));
 254	if (IS_ERR(dentry)) {
 255		error = PTR_ERR(dentry);
 256		goto fail_lock;
 257	}
 258
 259	if (d_really_is_positive(dentry)) {
 260		error = -EEXIST;
 261		goto fail_dentry;
 262	}
 263
 264	error = __aafs_setup_d_inode(dir, dentry, mode, data, link, fops, iops);
 265	if (error)
 266		goto fail_dentry;
 267	inode_unlock(dir);
 268
 269	return dentry;
 270
 271fail_dentry:
 272	dput(dentry);
 273
 274fail_lock:
 275	inode_unlock(dir);
 276	simple_release_fs(&aafs_mnt, &aafs_count);
 277
 278	return ERR_PTR(error);
 279}
 280
 281/**
 282 * aafs_create_file - create a file in the apparmorfs filesystem
 283 *
 284 * @name: name of dentry to create
 285 * @mode: permissions the file should have
 286 * @parent: parent directory for this dentry
 287 * @data: data to store on inode.i_private, available in open()
 288 * @fops: struct file_operations that should be used for
 289 *
 290 * see aafs_create
 291 */
 292static struct dentry *aafs_create_file(const char *name, umode_t mode,
 293				       struct dentry *parent, void *data,
 294				       const struct file_operations *fops)
 295{
 296	return aafs_create(name, mode, parent, data, NULL, fops, NULL);
 297}
 298
 299/**
 300 * aafs_create_dir - create a directory in the apparmorfs filesystem
 301 *
 302 * @name: name of dentry to create
 303 * @parent: parent directory for this dentry
 304 *
 305 * see aafs_create
 306 */
 307static struct dentry *aafs_create_dir(const char *name, struct dentry *parent)
 308{
 309	return aafs_create(name, S_IFDIR | 0755, parent, NULL, NULL, NULL,
 310			   NULL);
 311}
 312
 313/**
 314 * aafs_create_symlink - create a symlink in the apparmorfs filesystem
 315 * @name: name of dentry to create
 316 * @parent: parent directory for this dentry
 317 * @target: if symlink, symlink target string
 318 * @private: private data
 319 * @iops: struct of inode_operations that should be used
 320 *
 321 * If @target parameter is %NULL, then the @iops parameter needs to be
 322 * setup to handle .readlink and .get_link inode_operations.
 323 */
 324static struct dentry *aafs_create_symlink(const char *name,
 325					  struct dentry *parent,
 326					  const char *target,
 327					  void *private,
 328					  const struct inode_operations *iops)
 329{
 330	struct dentry *dent;
 331	char *link = NULL;
 332
 333	if (target) {
 334		if (!link)
 335			return ERR_PTR(-ENOMEM);
 336	}
 337	dent = aafs_create(name, S_IFLNK | 0444, parent, private, link, NULL,
 338			   iops);
 339	if (IS_ERR(dent))
 340		kfree(link);
 341
 342	return dent;
 343}
 344
 345/**
 346 * aafs_remove - removes a file or directory from the apparmorfs filesystem
 347 *
 348 * @dentry: dentry of the file/directory/symlink to removed.
 349 */
 350static void aafs_remove(struct dentry *dentry)
 351{
 352	struct inode *dir;
 353
 354	if (!dentry || IS_ERR(dentry))
 355		return;
 356
 357	dir = d_inode(dentry->d_parent);
 358	inode_lock(dir);
 359	if (simple_positive(dentry)) {
 360		if (d_is_dir(dentry))
 361			simple_rmdir(dir, dentry);
 362		else
 363			simple_unlink(dir, dentry);
 364		d_delete(dentry);
 365		dput(dentry);
 366	}
 367	inode_unlock(dir);
 368	simple_release_fs(&aafs_mnt, &aafs_count);
 369}
 370
 371
 372/*
 373 * aa_fs - policy load/replace/remove
 374 */
 375
 376/**
 377 * aa_simple_write_to_buffer - common routine for getting policy from user
 378 * @userbuf: user buffer to copy data from  (NOT NULL)
 379 * @alloc_size: size of user buffer (REQUIRES: @alloc_size >= @copy_size)
 380 * @copy_size: size of data to copy from user buffer
 381 * @pos: position write is at in the file (NOT NULL)
 382 *
 383 * Returns: kernel buffer containing copy of user buffer data or an
 384 *          ERR_PTR on failure.
 385 */
 386static struct aa_loaddata *aa_simple_write_to_buffer(const char __user *userbuf,
 387						     size_t alloc_size,
 388						     size_t copy_size,
 389						     loff_t *pos)
 390{
 391	struct aa_loaddata *data;
 392
 393	AA_BUG(copy_size > alloc_size);
 394
 395	if (*pos != 0)
 396		/* only writes from pos 0, that is complete writes */
 397		return ERR_PTR(-ESPIPE);
 398
 399	/* freed by caller to simple_write_to_buffer */
 400	data = aa_loaddata_alloc(alloc_size);
 401	if (IS_ERR(data))
 402		return data;
 403
 404	data->size = copy_size;
 405	if (copy_from_user(data->data, userbuf, copy_size)) {
 406		kvfree(data);
 407		return ERR_PTR(-EFAULT);
 408	}
 409
 410	return data;
 411}
 412
 413static ssize_t policy_update(u32 mask, const char __user *buf, size_t size,
 414			     loff_t *pos, struct aa_ns *ns)
 415{
 416	struct aa_loaddata *data;
 417	struct aa_label *label;
 418	ssize_t error;
 419
 420	label = begin_current_label_crit_section();
 421
 422	/* high level check about policy management - fine grained in
 423	 * below after unpack
 424	 */
 425	error = aa_may_manage_policy(label, ns, mask);
 426	if (error)
 427		return error;
 428
 429	data = aa_simple_write_to_buffer(buf, size, size, pos);
 430	error = PTR_ERR(data);
 431	if (!IS_ERR(data)) {
 432		error = aa_replace_profiles(ns, label, mask, data);
 433		aa_put_loaddata(data);
 434	}
 
 435	end_current_label_crit_section(label);
 436
 437	return error;
 438}
 439
 440/* .load file hook fn to load policy */
 441static ssize_t profile_load(struct file *f, const char __user *buf, size_t size,
 442			    loff_t *pos)
 443{
 444	struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
 445	int error = policy_update(AA_MAY_LOAD_POLICY, buf, size, pos, ns);
 446
 447	aa_put_ns(ns);
 448
 449	return error;
 450}
 451
 452static const struct file_operations aa_fs_profile_load = {
 453	.write = profile_load,
 454	.llseek = default_llseek,
 455};
 456
 457/* .replace file hook fn to load and/or replace policy */
 458static ssize_t profile_replace(struct file *f, const char __user *buf,
 459			       size_t size, loff_t *pos)
 460{
 461	struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
 462	int error = policy_update(AA_MAY_LOAD_POLICY | AA_MAY_REPLACE_POLICY,
 463				  buf, size, pos, ns);
 464	aa_put_ns(ns);
 465
 466	return error;
 467}
 468
 469static const struct file_operations aa_fs_profile_replace = {
 470	.write = profile_replace,
 471	.llseek = default_llseek,
 472};
 473
 474/* .remove file hook fn to remove loaded policy */
 475static ssize_t profile_remove(struct file *f, const char __user *buf,
 476			      size_t size, loff_t *pos)
 477{
 478	struct aa_loaddata *data;
 479	struct aa_label *label;
 480	ssize_t error;
 481	struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
 482
 483	label = begin_current_label_crit_section();
 484	/* high level check about policy management - fine grained in
 485	 * below after unpack
 486	 */
 487	error = aa_may_manage_policy(label, ns, AA_MAY_REMOVE_POLICY);
 
 488	if (error)
 489		goto out;
 490
 491	/*
 492	 * aa_remove_profile needs a null terminated string so 1 extra
 493	 * byte is allocated and the copied data is null terminated.
 494	 */
 495	data = aa_simple_write_to_buffer(buf, size + 1, size, pos);
 496
 497	error = PTR_ERR(data);
 498	if (!IS_ERR(data)) {
 499		data->data[size] = 0;
 500		error = aa_remove_profiles(ns, label, data->data, size);
 501		aa_put_loaddata(data);
 502	}
 503 out:
 504	end_current_label_crit_section(label);
 505	aa_put_ns(ns);
 506	return error;
 507}
 508
 509static const struct file_operations aa_fs_profile_remove = {
 510	.write = profile_remove,
 511	.llseek = default_llseek,
 512};
 513
 514struct aa_revision {
 515	struct aa_ns *ns;
 516	long last_read;
 517};
 518
 519/* revision file hook fn for policy loads */
 520static int ns_revision_release(struct inode *inode, struct file *file)
 521{
 522	struct aa_revision *rev = file->private_data;
 523
 524	if (rev) {
 525		aa_put_ns(rev->ns);
 526		kfree(rev);
 527	}
 528
 529	return 0;
 530}
 531
 532static ssize_t ns_revision_read(struct file *file, char __user *buf,
 533				size_t size, loff_t *ppos)
 534{
 535	struct aa_revision *rev = file->private_data;
 536	char buffer[32];
 537	long last_read;
 538	int avail;
 539
 540	mutex_lock_nested(&rev->ns->lock, rev->ns->level);
 541	last_read = rev->last_read;
 542	if (last_read == rev->ns->revision) {
 543		mutex_unlock(&rev->ns->lock);
 544		if (file->f_flags & O_NONBLOCK)
 545			return -EAGAIN;
 546		if (wait_event_interruptible(rev->ns->wait,
 547					     last_read !=
 548					     READ_ONCE(rev->ns->revision)))
 549			return -ERESTARTSYS;
 550		mutex_lock_nested(&rev->ns->lock, rev->ns->level);
 551	}
 552
 553	avail = sprintf(buffer, "%ld\n", rev->ns->revision);
 554	if (*ppos + size > avail) {
 555		rev->last_read = rev->ns->revision;
 556		*ppos = 0;
 557	}
 558	mutex_unlock(&rev->ns->lock);
 559
 560	return simple_read_from_buffer(buf, size, ppos, buffer, avail);
 561}
 562
 563static int ns_revision_open(struct inode *inode, struct file *file)
 564{
 565	struct aa_revision *rev = kzalloc(sizeof(*rev), GFP_KERNEL);
 566
 567	if (!rev)
 568		return -ENOMEM;
 569
 570	rev->ns = aa_get_ns(inode->i_private);
 571	if (!rev->ns)
 572		rev->ns = aa_get_current_ns();
 573	file->private_data = rev;
 574
 575	return 0;
 576}
 577
 578static __poll_t ns_revision_poll(struct file *file, poll_table *pt)
 579{
 580	struct aa_revision *rev = file->private_data;
 581	__poll_t mask = 0;
 582
 583	if (rev) {
 584		mutex_lock_nested(&rev->ns->lock, rev->ns->level);
 585		poll_wait(file, &rev->ns->wait, pt);
 586		if (rev->last_read < rev->ns->revision)
 587			mask |= EPOLLIN | EPOLLRDNORM;
 588		mutex_unlock(&rev->ns->lock);
 589	}
 590
 591	return mask;
 592}
 593
 594void __aa_bump_ns_revision(struct aa_ns *ns)
 595{
 596	ns->revision++;
 597	wake_up_interruptible(&ns->wait);
 598}
 599
 600static const struct file_operations aa_fs_ns_revision_fops = {
 601	.owner		= THIS_MODULE,
 602	.open		= ns_revision_open,
 603	.poll		= ns_revision_poll,
 604	.read		= ns_revision_read,
 605	.llseek		= generic_file_llseek,
 606	.release	= ns_revision_release,
 607};
 608
 609static void profile_query_cb(struct aa_profile *profile, struct aa_perms *perms,
 610			     const char *match_str, size_t match_len)
 611{
 
 
 612	struct aa_perms tmp = { };
 613	struct aa_dfa *dfa;
 614	unsigned int state = 0;
 615
 616	if (profile_unconfined(profile))
 617		return;
 618	if (profile->file.dfa && *match_str == AA_CLASS_FILE) {
 619		dfa = profile->file.dfa;
 620		state = aa_dfa_match_len(dfa, profile->file.start,
 621					 match_str + 1, match_len - 1);
 622		if (state) {
 623			struct path_cond cond = { };
 624
 625			tmp = aa_compute_fperms(dfa, state, &cond);
 626		}
 627	} else if (profile->policy.dfa) {
 628		if (!PROFILE_MEDIATES(profile, *match_str))
 629			return;	/* no change to current perms */
 630		dfa = profile->policy.dfa;
 631		state = aa_dfa_match_len(dfa, profile->policy.start[0],
 632					 match_str, match_len);
 633		if (state)
 634			aa_compute_perms(dfa, state, &tmp);
 635	}
 636	aa_apply_modes_to_perms(profile, &tmp);
 637	aa_perms_accum_raw(perms, &tmp);
 638}
 639
 640
 641/**
 642 * query_data - queries a policy and writes its data to buf
 643 * @buf: the resulting data is stored here (NOT NULL)
 644 * @buf_len: size of buf
 645 * @query: query string used to retrieve data
 646 * @query_len: size of query including second NUL byte
 647 *
 648 * The buffers pointed to by buf and query may overlap. The query buffer is
 649 * parsed before buf is written to.
 650 *
 651 * The query should look like "<LABEL>\0<KEY>\0", where <LABEL> is the name of
 652 * the security confinement context and <KEY> is the name of the data to
 653 * retrieve. <LABEL> and <KEY> must not be NUL-terminated.
 654 *
 655 * Don't expect the contents of buf to be preserved on failure.
 656 *
 657 * Returns: number of characters written to buf or -errno on failure
 658 */
 659static ssize_t query_data(char *buf, size_t buf_len,
 660			  char *query, size_t query_len)
 661{
 662	char *out;
 663	const char *key;
 664	struct label_it i;
 665	struct aa_label *label, *curr;
 666	struct aa_profile *profile;
 667	struct aa_data *data;
 668	u32 bytes, blocks;
 669	__le32 outle32;
 670
 671	if (!query_len)
 672		return -EINVAL; /* need a query */
 673
 674	key = query + strnlen(query, query_len) + 1;
 675	if (key + 1 >= query + query_len)
 676		return -EINVAL; /* not enough space for a non-empty key */
 677	if (key + strnlen(key, query + query_len - key) >= query + query_len)
 678		return -EINVAL; /* must end with NUL */
 679
 680	if (buf_len < sizeof(bytes) + sizeof(blocks))
 681		return -EINVAL; /* not enough space */
 682
 683	curr = begin_current_label_crit_section();
 684	label = aa_label_parse(curr, query, GFP_KERNEL, false, false);
 685	end_current_label_crit_section(curr);
 686	if (IS_ERR(label))
 687		return PTR_ERR(label);
 688
 689	/* We are going to leave space for two numbers. The first is the total
 690	 * number of bytes we are writing after the first number. This is so
 691	 * users can read the full output without reallocation.
 692	 *
 693	 * The second number is the number of data blocks we're writing. An
 694	 * application might be confined by multiple policies having data in
 695	 * the same key.
 696	 */
 697	memset(buf, 0, sizeof(bytes) + sizeof(blocks));
 698	out = buf + sizeof(bytes) + sizeof(blocks);
 699
 700	blocks = 0;
 701	label_for_each_confined(i, label, profile) {
 702		if (!profile->data)
 703			continue;
 704
 705		data = rhashtable_lookup_fast(profile->data, &key,
 706					      profile->data->p);
 707
 708		if (data) {
 709			if (out + sizeof(outle32) + data->size > buf +
 710			    buf_len) {
 711				aa_put_label(label);
 712				return -EINVAL; /* not enough space */
 713			}
 714			outle32 = __cpu_to_le32(data->size);
 715			memcpy(out, &outle32, sizeof(outle32));
 716			out += sizeof(outle32);
 717			memcpy(out, data->data, data->size);
 718			out += data->size;
 719			blocks++;
 720		}
 721	}
 722	aa_put_label(label);
 723
 724	outle32 = __cpu_to_le32(out - buf - sizeof(bytes));
 725	memcpy(buf, &outle32, sizeof(outle32));
 726	outle32 = __cpu_to_le32(blocks);
 727	memcpy(buf + sizeof(bytes), &outle32, sizeof(outle32));
 728
 729	return out - buf;
 730}
 731
 732/**
 733 * query_label - queries a label and writes permissions to buf
 734 * @buf: the resulting permissions string is stored here (NOT NULL)
 735 * @buf_len: size of buf
 736 * @query: binary query string to match against the dfa
 737 * @query_len: size of query
 738 * @view_only: only compute for querier's view
 739 *
 740 * The buffers pointed to by buf and query may overlap. The query buffer is
 741 * parsed before buf is written to.
 742 *
 743 * The query should look like "LABEL_NAME\0DFA_STRING" where LABEL_NAME is
 744 * the name of the label, in the current namespace, that is to be queried and
 745 * DFA_STRING is a binary string to match against the label(s)'s DFA.
 746 *
 747 * LABEL_NAME must be NUL terminated. DFA_STRING may contain NUL characters
 748 * but must *not* be NUL terminated.
 749 *
 750 * Returns: number of characters written to buf or -errno on failure
 751 */
 752static ssize_t query_label(char *buf, size_t buf_len,
 753			   char *query, size_t query_len, bool view_only)
 754{
 755	struct aa_profile *profile;
 756	struct aa_label *label, *curr;
 757	char *label_name, *match_str;
 758	size_t label_name_len, match_len;
 759	struct aa_perms perms;
 760	struct label_it i;
 761
 762	if (!query_len)
 763		return -EINVAL;
 764
 765	label_name = query;
 766	label_name_len = strnlen(query, query_len);
 767	if (!label_name_len || label_name_len == query_len)
 768		return -EINVAL;
 769
 770	/**
 771	 * The extra byte is to account for the null byte between the
 772	 * profile name and dfa string. profile_name_len is greater
 773	 * than zero and less than query_len, so a byte can be safely
 774	 * added or subtracted.
 775	 */
 776	match_str = label_name + label_name_len + 1;
 777	match_len = query_len - label_name_len - 1;
 778
 779	curr = begin_current_label_crit_section();
 780	label = aa_label_parse(curr, label_name, GFP_KERNEL, false, false);
 781	end_current_label_crit_section(curr);
 782	if (IS_ERR(label))
 783		return PTR_ERR(label);
 784
 785	perms = allperms;
 786	if (view_only) {
 787		label_for_each_in_ns(i, labels_ns(label), label, profile) {
 788			profile_query_cb(profile, &perms, match_str, match_len);
 789		}
 790	} else {
 791		label_for_each(i, label, profile) {
 792			profile_query_cb(profile, &perms, match_str, match_len);
 793		}
 794	}
 795	aa_put_label(label);
 796
 797	return scnprintf(buf, buf_len,
 798		      "allow 0x%08x\ndeny 0x%08x\naudit 0x%08x\nquiet 0x%08x\n",
 799		      perms.allow, perms.deny, perms.audit, perms.quiet);
 800}
 801
 802/*
 803 * Transaction based IO.
 804 * The file expects a write which triggers the transaction, and then
 805 * possibly a read(s) which collects the result - which is stored in a
 806 * file-local buffer. Once a new write is performed, a new set of results
 807 * are stored in the file-local buffer.
 808 */
 809struct multi_transaction {
 810	struct kref count;
 811	ssize_t size;
 812	char data[0];
 813};
 814
 815#define MULTI_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct multi_transaction))
 816/* TODO: replace with per file lock */
 817static DEFINE_SPINLOCK(multi_transaction_lock);
 818
 819static void multi_transaction_kref(struct kref *kref)
 820{
 821	struct multi_transaction *t;
 822
 823	t = container_of(kref, struct multi_transaction, count);
 824	free_page((unsigned long) t);
 825}
 826
 827static struct multi_transaction *
 828get_multi_transaction(struct multi_transaction *t)
 829{
 830	if  (t)
 831		kref_get(&(t->count));
 832
 833	return t;
 834}
 835
 836static void put_multi_transaction(struct multi_transaction *t)
 837{
 838	if (t)
 839		kref_put(&(t->count), multi_transaction_kref);
 840}
 841
 842/* does not increment @new's count */
 843static void multi_transaction_set(struct file *file,
 844				  struct multi_transaction *new, size_t n)
 845{
 846	struct multi_transaction *old;
 847
 848	AA_BUG(n > MULTI_TRANSACTION_LIMIT);
 849
 850	new->size = n;
 851	spin_lock(&multi_transaction_lock);
 852	old = (struct multi_transaction *) file->private_data;
 853	file->private_data = new;
 854	spin_unlock(&multi_transaction_lock);
 855	put_multi_transaction(old);
 856}
 857
 858static struct multi_transaction *multi_transaction_new(struct file *file,
 859						       const char __user *buf,
 860						       size_t size)
 861{
 862	struct multi_transaction *t;
 863
 864	if (size > MULTI_TRANSACTION_LIMIT - 1)
 865		return ERR_PTR(-EFBIG);
 866
 867	t = (struct multi_transaction *)get_zeroed_page(GFP_KERNEL);
 868	if (!t)
 869		return ERR_PTR(-ENOMEM);
 870	kref_init(&t->count);
 871	if (copy_from_user(t->data, buf, size))
 
 872		return ERR_PTR(-EFAULT);
 
 873
 874	return t;
 875}
 876
 877static ssize_t multi_transaction_read(struct file *file, char __user *buf,
 878				       size_t size, loff_t *pos)
 879{
 880	struct multi_transaction *t;
 881	ssize_t ret;
 882
 883	spin_lock(&multi_transaction_lock);
 884	t = get_multi_transaction(file->private_data);
 885	spin_unlock(&multi_transaction_lock);
 
 886	if (!t)
 887		return 0;
 888
 889	ret = simple_read_from_buffer(buf, size, pos, t->data, t->size);
 890	put_multi_transaction(t);
 891
 892	return ret;
 893}
 894
 895static int multi_transaction_release(struct inode *inode, struct file *file)
 896{
 897	put_multi_transaction(file->private_data);
 898
 899	return 0;
 900}
 901
 902#define QUERY_CMD_LABEL		"label\0"
 903#define QUERY_CMD_LABEL_LEN	6
 904#define QUERY_CMD_PROFILE	"profile\0"
 905#define QUERY_CMD_PROFILE_LEN	8
 906#define QUERY_CMD_LABELALL	"labelall\0"
 907#define QUERY_CMD_LABELALL_LEN	9
 908#define QUERY_CMD_DATA		"data\0"
 909#define QUERY_CMD_DATA_LEN	5
 910
 911/**
 912 * aa_write_access - generic permissions and data query
 913 * @file: pointer to open apparmorfs/access file
 914 * @ubuf: user buffer containing the complete query string (NOT NULL)
 915 * @count: size of ubuf
 916 * @ppos: position in the file (MUST BE ZERO)
 917 *
 918 * Allows for one permissions or data query per open(), write(), and read()
 919 * sequence. The only queries currently supported are label-based queries for
 920 * permissions or data.
 921 *
 922 * For permissions queries, ubuf must begin with "label\0", followed by the
 923 * profile query specific format described in the query_label() function
 924 * documentation.
 925 *
 926 * For data queries, ubuf must have the form "data\0<LABEL>\0<KEY>\0", where
 927 * <LABEL> is the name of the security confinement context and <KEY> is the
 928 * name of the data to retrieve.
 929 *
 930 * Returns: number of bytes written or -errno on failure
 931 */
 932static ssize_t aa_write_access(struct file *file, const char __user *ubuf,
 933			       size_t count, loff_t *ppos)
 934{
 935	struct multi_transaction *t;
 936	ssize_t len;
 937
 938	if (*ppos)
 939		return -ESPIPE;
 940
 941	t = multi_transaction_new(file, ubuf, count);
 942	if (IS_ERR(t))
 943		return PTR_ERR(t);
 944
 945	if (count > QUERY_CMD_PROFILE_LEN &&
 946	    !memcmp(t->data, QUERY_CMD_PROFILE, QUERY_CMD_PROFILE_LEN)) {
 947		len = query_label(t->data, MULTI_TRANSACTION_LIMIT,
 948				  t->data + QUERY_CMD_PROFILE_LEN,
 949				  count - QUERY_CMD_PROFILE_LEN, true);
 950	} else if (count > QUERY_CMD_LABEL_LEN &&
 951		   !memcmp(t->data, QUERY_CMD_LABEL, QUERY_CMD_LABEL_LEN)) {
 952		len = query_label(t->data, MULTI_TRANSACTION_LIMIT,
 953				  t->data + QUERY_CMD_LABEL_LEN,
 954				  count - QUERY_CMD_LABEL_LEN, true);
 955	} else if (count > QUERY_CMD_LABELALL_LEN &&
 956		   !memcmp(t->data, QUERY_CMD_LABELALL,
 957			   QUERY_CMD_LABELALL_LEN)) {
 958		len = query_label(t->data, MULTI_TRANSACTION_LIMIT,
 959				  t->data + QUERY_CMD_LABELALL_LEN,
 960				  count - QUERY_CMD_LABELALL_LEN, false);
 961	} else if (count > QUERY_CMD_DATA_LEN &&
 962		   !memcmp(t->data, QUERY_CMD_DATA, QUERY_CMD_DATA_LEN)) {
 963		len = query_data(t->data, MULTI_TRANSACTION_LIMIT,
 964				 t->data + QUERY_CMD_DATA_LEN,
 965				 count - QUERY_CMD_DATA_LEN);
 966	} else
 967		len = -EINVAL;
 968
 969	if (len < 0) {
 970		put_multi_transaction(t);
 971		return len;
 972	}
 973
 974	multi_transaction_set(file, t, len);
 975
 976	return count;
 977}
 978
 979static const struct file_operations aa_sfs_access = {
 980	.write		= aa_write_access,
 981	.read		= multi_transaction_read,
 982	.release	= multi_transaction_release,
 983	.llseek		= generic_file_llseek,
 984};
 985
 986static int aa_sfs_seq_show(struct seq_file *seq, void *v)
 987{
 988	struct aa_sfs_entry *fs_file = seq->private;
 989
 990	if (!fs_file)
 991		return 0;
 992
 993	switch (fs_file->v_type) {
 994	case AA_SFS_TYPE_BOOLEAN:
 995		seq_printf(seq, "%s\n", fs_file->v.boolean ? "yes" : "no");
 996		break;
 997	case AA_SFS_TYPE_STRING:
 998		seq_printf(seq, "%s\n", fs_file->v.string);
 999		break;
1000	case AA_SFS_TYPE_U64:
1001		seq_printf(seq, "%#08lx\n", fs_file->v.u64);
1002		break;
1003	default:
1004		/* Ignore unpritable entry types. */
1005		break;
1006	}
1007
1008	return 0;
1009}
1010
1011static int aa_sfs_seq_open(struct inode *inode, struct file *file)
1012{
1013	return single_open(file, aa_sfs_seq_show, inode->i_private);
1014}
1015
1016const struct file_operations aa_sfs_seq_file_ops = {
1017	.owner		= THIS_MODULE,
1018	.open		= aa_sfs_seq_open,
1019	.read		= seq_read,
1020	.llseek		= seq_lseek,
1021	.release	= single_release,
1022};
1023
1024/*
1025 * profile based file operations
1026 *     policy/profiles/XXXX/profiles/ *
1027 */
1028
1029#define SEQ_PROFILE_FOPS(NAME)						      \
1030static int seq_profile_ ##NAME ##_open(struct inode *inode, struct file *file)\
1031{									      \
1032	return seq_profile_open(inode, file, seq_profile_ ##NAME ##_show);    \
1033}									      \
1034									      \
1035static const struct file_operations seq_profile_ ##NAME ##_fops = {	      \
1036	.owner		= THIS_MODULE,					      \
1037	.open		= seq_profile_ ##NAME ##_open,			      \
1038	.read		= seq_read,					      \
1039	.llseek		= seq_lseek,					      \
1040	.release	= seq_profile_release,				      \
1041}									      \
1042
1043static int seq_profile_open(struct inode *inode, struct file *file,
1044			    int (*show)(struct seq_file *, void *))
1045{
1046	struct aa_proxy *proxy = aa_get_proxy(inode->i_private);
1047	int error = single_open(file, show, proxy);
1048
1049	if (error) {
1050		file->private_data = NULL;
1051		aa_put_proxy(proxy);
1052	}
1053
1054	return error;
1055}
1056
1057static int seq_profile_release(struct inode *inode, struct file *file)
1058{
1059	struct seq_file *seq = (struct seq_file *) file->private_data;
1060	if (seq)
1061		aa_put_proxy(seq->private);
1062	return single_release(inode, file);
1063}
1064
1065static int seq_profile_name_show(struct seq_file *seq, void *v)
1066{
1067	struct aa_proxy *proxy = seq->private;
1068	struct aa_label *label = aa_get_label_rcu(&proxy->label);
1069	struct aa_profile *profile = labels_profile(label);
1070	seq_printf(seq, "%s\n", profile->base.name);
1071	aa_put_label(label);
1072
1073	return 0;
1074}
1075
1076static int seq_profile_mode_show(struct seq_file *seq, void *v)
1077{
1078	struct aa_proxy *proxy = seq->private;
1079	struct aa_label *label = aa_get_label_rcu(&proxy->label);
1080	struct aa_profile *profile = labels_profile(label);
1081	seq_printf(seq, "%s\n", aa_profile_mode_names[profile->mode]);
1082	aa_put_label(label);
1083
1084	return 0;
1085}
1086
1087static int seq_profile_attach_show(struct seq_file *seq, void *v)
1088{
1089	struct aa_proxy *proxy = seq->private;
1090	struct aa_label *label = aa_get_label_rcu(&proxy->label);
1091	struct aa_profile *profile = labels_profile(label);
1092	if (profile->attach)
1093		seq_printf(seq, "%s\n", profile->attach);
1094	else if (profile->xmatch)
1095		seq_puts(seq, "<unknown>\n");
1096	else
1097		seq_printf(seq, "%s\n", profile->base.name);
1098	aa_put_label(label);
1099
1100	return 0;
1101}
1102
1103static int seq_profile_hash_show(struct seq_file *seq, void *v)
1104{
1105	struct aa_proxy *proxy = seq->private;
1106	struct aa_label *label = aa_get_label_rcu(&proxy->label);
1107	struct aa_profile *profile = labels_profile(label);
1108	unsigned int i, size = aa_hash_size();
1109
1110	if (profile->hash) {
1111		for (i = 0; i < size; i++)
1112			seq_printf(seq, "%.2x", profile->hash[i]);
1113		seq_putc(seq, '\n');
1114	}
1115	aa_put_label(label);
1116
1117	return 0;
1118}
1119
1120SEQ_PROFILE_FOPS(name);
1121SEQ_PROFILE_FOPS(mode);
1122SEQ_PROFILE_FOPS(attach);
1123SEQ_PROFILE_FOPS(hash);
1124
1125/*
1126 * namespace based files
1127 *     several root files and
1128 *     policy/ *
1129 */
1130
1131#define SEQ_NS_FOPS(NAME)						      \
1132static int seq_ns_ ##NAME ##_open(struct inode *inode, struct file *file)     \
1133{									      \
1134	return single_open(file, seq_ns_ ##NAME ##_show, inode->i_private);   \
1135}									      \
1136									      \
1137static const struct file_operations seq_ns_ ##NAME ##_fops = {	      \
1138	.owner		= THIS_MODULE,					      \
1139	.open		= seq_ns_ ##NAME ##_open,			      \
1140	.read		= seq_read,					      \
1141	.llseek		= seq_lseek,					      \
1142	.release	= single_release,				      \
1143}									      \
1144
1145static int seq_ns_stacked_show(struct seq_file *seq, void *v)
1146{
1147	struct aa_label *label;
1148
1149	label = begin_current_label_crit_section();
1150	seq_printf(seq, "%s\n", label->size > 1 ? "yes" : "no");
1151	end_current_label_crit_section(label);
1152
1153	return 0;
1154}
1155
1156static int seq_ns_nsstacked_show(struct seq_file *seq, void *v)
1157{
1158	struct aa_label *label;
1159	struct aa_profile *profile;
1160	struct label_it it;
1161	int count = 1;
1162
1163	label = begin_current_label_crit_section();
1164
1165	if (label->size > 1) {
1166		label_for_each(it, label, profile)
1167			if (profile->ns != labels_ns(label)) {
1168				count++;
1169				break;
1170			}
1171	}
1172
1173	seq_printf(seq, "%s\n", count > 1 ? "yes" : "no");
1174	end_current_label_crit_section(label);
1175
1176	return 0;
1177}
1178
1179static int seq_ns_level_show(struct seq_file *seq, void *v)
1180{
1181	struct aa_label *label;
1182
1183	label = begin_current_label_crit_section();
1184	seq_printf(seq, "%d\n", labels_ns(label)->level);
1185	end_current_label_crit_section(label);
1186
1187	return 0;
1188}
1189
1190static int seq_ns_name_show(struct seq_file *seq, void *v)
1191{
1192	struct aa_label *label = begin_current_label_crit_section();
1193	seq_printf(seq, "%s\n", labels_ns(label)->base.name);
1194	end_current_label_crit_section(label);
1195
1196	return 0;
1197}
1198
 
 
 
 
 
 
 
 
 
 
 
 
1199SEQ_NS_FOPS(stacked);
1200SEQ_NS_FOPS(nsstacked);
1201SEQ_NS_FOPS(level);
1202SEQ_NS_FOPS(name);
 
 
1203
1204
1205/* policy/raw_data/ * file ops */
1206
1207#define SEQ_RAWDATA_FOPS(NAME)						      \
1208static int seq_rawdata_ ##NAME ##_open(struct inode *inode, struct file *file)\
1209{									      \
1210	return seq_rawdata_open(inode, file, seq_rawdata_ ##NAME ##_show);    \
1211}									      \
1212									      \
1213static const struct file_operations seq_rawdata_ ##NAME ##_fops = {	      \
1214	.owner		= THIS_MODULE,					      \
1215	.open		= seq_rawdata_ ##NAME ##_open,			      \
1216	.read		= seq_read,					      \
1217	.llseek		= seq_lseek,					      \
1218	.release	= seq_rawdata_release,				      \
1219}									      \
1220
1221static int seq_rawdata_open(struct inode *inode, struct file *file,
1222			    int (*show)(struct seq_file *, void *))
1223{
1224	struct aa_loaddata *data = __aa_get_loaddata(inode->i_private);
1225	int error;
1226
1227	if (!data)
1228		/* lost race this ent is being reaped */
1229		return -ENOENT;
1230
1231	error = single_open(file, show, data);
1232	if (error) {
1233		AA_BUG(file->private_data &&
1234		       ((struct seq_file *)file->private_data)->private);
1235		aa_put_loaddata(data);
1236	}
1237
1238	return error;
1239}
1240
1241static int seq_rawdata_release(struct inode *inode, struct file *file)
1242{
1243	struct seq_file *seq = (struct seq_file *) file->private_data;
1244
1245	if (seq)
1246		aa_put_loaddata(seq->private);
1247
1248	return single_release(inode, file);
1249}
1250
1251static int seq_rawdata_abi_show(struct seq_file *seq, void *v)
1252{
1253	struct aa_loaddata *data = seq->private;
1254
1255	seq_printf(seq, "v%d\n", data->abi);
1256
1257	return 0;
1258}
1259
1260static int seq_rawdata_revision_show(struct seq_file *seq, void *v)
1261{
1262	struct aa_loaddata *data = seq->private;
1263
1264	seq_printf(seq, "%ld\n", data->revision);
1265
1266	return 0;
1267}
1268
1269static int seq_rawdata_hash_show(struct seq_file *seq, void *v)
1270{
1271	struct aa_loaddata *data = seq->private;
1272	unsigned int i, size = aa_hash_size();
1273
1274	if (data->hash) {
1275		for (i = 0; i < size; i++)
1276			seq_printf(seq, "%.2x", data->hash[i]);
1277		seq_putc(seq, '\n');
1278	}
1279
1280	return 0;
1281}
1282
 
 
 
 
 
 
 
 
 
1283SEQ_RAWDATA_FOPS(abi);
1284SEQ_RAWDATA_FOPS(revision);
1285SEQ_RAWDATA_FOPS(hash);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1286
1287static ssize_t rawdata_read(struct file *file, char __user *buf, size_t size,
1288			    loff_t *ppos)
1289{
1290	struct aa_loaddata *rawdata = file->private_data;
1291
1292	return simple_read_from_buffer(buf, size, ppos, rawdata->data,
1293				       rawdata->size);
 
1294}
1295
1296static int rawdata_release(struct inode *inode, struct file *file)
1297{
1298	aa_put_loaddata(file->private_data);
1299
1300	return 0;
1301}
1302
1303static int rawdata_open(struct inode *inode, struct file *file)
1304{
1305	if (!policy_view_capable(NULL))
 
 
 
 
1306		return -EACCES;
1307	file->private_data = __aa_get_loaddata(inode->i_private);
1308	if (!file->private_data)
 
1309		/* lost race: this entry is being reaped */
1310		return -ENOENT;
1311
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1312	return 0;
 
 
 
 
 
 
 
 
1313}
1314
1315static const struct file_operations rawdata_fops = {
1316	.open = rawdata_open,
1317	.read = rawdata_read,
1318	.llseek = generic_file_llseek,
1319	.release = rawdata_release,
1320};
1321
1322static void remove_rawdata_dents(struct aa_loaddata *rawdata)
1323{
1324	int i;
1325
1326	for (i = 0; i < AAFS_LOADDATA_NDENTS; i++) {
1327		if (!IS_ERR_OR_NULL(rawdata->dents[i])) {
1328			/* no refcounts on i_private */
1329			aafs_remove(rawdata->dents[i]);
1330			rawdata->dents[i] = NULL;
1331		}
1332	}
1333}
1334
1335void __aa_fs_remove_rawdata(struct aa_loaddata *rawdata)
1336{
1337	AA_BUG(rawdata->ns && !mutex_is_locked(&rawdata->ns->lock));
1338
1339	if (rawdata->ns) {
1340		remove_rawdata_dents(rawdata);
1341		list_del_init(&rawdata->list);
1342		aa_put_ns(rawdata->ns);
1343		rawdata->ns = NULL;
1344	}
1345}
1346
1347int __aa_fs_create_rawdata(struct aa_ns *ns, struct aa_loaddata *rawdata)
1348{
1349	struct dentry *dent, *dir;
1350
1351	AA_BUG(!ns);
1352	AA_BUG(!rawdata);
1353	AA_BUG(!mutex_is_locked(&ns->lock));
1354	AA_BUG(!ns_subdata_dir(ns));
1355
1356	/*
1357	 * just use ns revision dir was originally created at. This is
1358	 * under ns->lock and if load is successful revision will be
1359	 * bumped and is guaranteed to be unique
1360	 */
1361	rawdata->name = kasprintf(GFP_KERNEL, "%ld", ns->revision);
1362	if (!rawdata->name)
1363		return -ENOMEM;
1364
1365	dir = aafs_create_dir(rawdata->name, ns_subdata_dir(ns));
1366	if (IS_ERR(dir))
1367		/* ->name freed when rawdata freed */
1368		return PTR_ERR(dir);
1369	rawdata->dents[AAFS_LOADDATA_DIR] = dir;
1370
1371	dent = aafs_create_file("abi", S_IFREG | 0444, dir, rawdata,
1372				      &seq_rawdata_abi_fops);
1373	if (IS_ERR(dent))
1374		goto fail;
1375	rawdata->dents[AAFS_LOADDATA_ABI] = dent;
1376
1377	dent = aafs_create_file("revision", S_IFREG | 0444, dir, rawdata,
1378				      &seq_rawdata_revision_fops);
1379	if (IS_ERR(dent))
1380		goto fail;
1381	rawdata->dents[AAFS_LOADDATA_REVISION] = dent;
1382
1383	if (aa_g_hash_policy) {
1384		dent = aafs_create_file("sha1", S_IFREG | 0444, dir,
1385					      rawdata, &seq_rawdata_hash_fops);
1386		if (IS_ERR(dent))
1387			goto fail;
1388		rawdata->dents[AAFS_LOADDATA_HASH] = dent;
1389	}
1390
 
 
 
 
 
 
 
1391	dent = aafs_create_file("raw_data", S_IFREG | 0444,
1392				      dir, rawdata, &rawdata_fops);
1393	if (IS_ERR(dent))
1394		goto fail;
1395	rawdata->dents[AAFS_LOADDATA_DATA] = dent;
1396	d_inode(dent)->i_size = rawdata->size;
1397
1398	rawdata->ns = aa_get_ns(ns);
1399	list_add(&rawdata->list, &ns->rawdata_list);
1400	/* no refcount on inode rawdata */
1401
1402	return 0;
1403
1404fail:
1405	remove_rawdata_dents(rawdata);
1406
1407	return PTR_ERR(dent);
1408}
 
 
1409
1410/** fns to setup dynamic per profile/namespace files **/
1411
1412/**
1413 *
1414 * Requires: @profile->ns->lock held
1415 */
1416void __aafs_profile_rmdir(struct aa_profile *profile)
1417{
1418	struct aa_profile *child;
1419	int i;
1420
1421	if (!profile)
1422		return;
1423
1424	list_for_each_entry(child, &profile->base.profiles, base.list)
1425		__aafs_profile_rmdir(child);
1426
1427	for (i = AAFS_PROF_SIZEOF - 1; i >= 0; --i) {
1428		struct aa_proxy *proxy;
1429		if (!profile->dents[i])
1430			continue;
1431
1432		proxy = d_inode(profile->dents[i])->i_private;
1433		aafs_remove(profile->dents[i]);
1434		aa_put_proxy(proxy);
1435		profile->dents[i] = NULL;
1436	}
1437}
1438
1439/**
1440 *
1441 * Requires: @old->ns->lock held
1442 */
1443void __aafs_profile_migrate_dents(struct aa_profile *old,
1444				  struct aa_profile *new)
1445{
1446	int i;
1447
1448	AA_BUG(!old);
1449	AA_BUG(!new);
1450	AA_BUG(!mutex_is_locked(&profiles_ns(old)->lock));
1451
1452	for (i = 0; i < AAFS_PROF_SIZEOF; i++) {
1453		new->dents[i] = old->dents[i];
1454		if (new->dents[i])
1455			new->dents[i]->d_inode->i_mtime = current_time(new->dents[i]->d_inode);
 
 
 
 
1456		old->dents[i] = NULL;
1457	}
1458}
1459
1460static struct dentry *create_profile_file(struct dentry *dir, const char *name,
1461					  struct aa_profile *profile,
1462					  const struct file_operations *fops)
1463{
1464	struct aa_proxy *proxy = aa_get_proxy(profile->label.proxy);
1465	struct dentry *dent;
1466
1467	dent = aafs_create_file(name, S_IFREG | 0444, dir, proxy, fops);
1468	if (IS_ERR(dent))
1469		aa_put_proxy(proxy);
1470
1471	return dent;
1472}
1473
 
1474static int profile_depth(struct aa_profile *profile)
1475{
1476	int depth = 0;
1477
1478	rcu_read_lock();
1479	for (depth = 0; profile; profile = rcu_access_pointer(profile->parent))
1480		depth++;
1481	rcu_read_unlock();
1482
1483	return depth;
1484}
1485
1486static char *gen_symlink_name(int depth, const char *dirname, const char *fname)
1487{
1488	char *buffer, *s;
1489	int error;
1490	int size = depth * 6 + strlen(dirname) + strlen(fname) + 11;
1491
1492	s = buffer = kmalloc(size, GFP_KERNEL);
1493	if (!buffer)
1494		return ERR_PTR(-ENOMEM);
1495
1496	for (; depth > 0; depth--) {
1497		strcpy(s, "../../");
1498		s += 6;
1499		size -= 6;
1500	}
1501
1502	error = snprintf(s, size, "raw_data/%s/%s", dirname, fname);
1503	if (error >= size || error < 0) {
1504		kfree(buffer);
1505		return ERR_PTR(-ENAMETOOLONG);
1506	}
1507
1508	return buffer;
1509}
1510
1511static void rawdata_link_cb(void *arg)
1512{
1513	kfree(arg);
1514}
1515
1516static const char *rawdata_get_link_base(struct dentry *dentry,
1517					 struct inode *inode,
1518					 struct delayed_call *done,
1519					 const char *name)
1520{
1521	struct aa_proxy *proxy = inode->i_private;
1522	struct aa_label *label;
1523	struct aa_profile *profile;
1524	char *target;
1525	int depth;
1526
1527	if (!dentry)
1528		return ERR_PTR(-ECHILD);
1529
1530	label = aa_get_label_rcu(&proxy->label);
1531	profile = labels_profile(label);
1532	depth = profile_depth(profile);
1533	target = gen_symlink_name(depth, profile->rawdata->name, name);
1534	aa_put_label(label);
1535
1536	if (IS_ERR(target))
1537		return target;
1538
1539	set_delayed_call(done, rawdata_link_cb, target);
1540
1541	return target;
1542}
1543
1544static const char *rawdata_get_link_sha1(struct dentry *dentry,
1545					 struct inode *inode,
1546					 struct delayed_call *done)
1547{
1548	return rawdata_get_link_base(dentry, inode, done, "sha1");
1549}
1550
1551static const char *rawdata_get_link_abi(struct dentry *dentry,
1552					struct inode *inode,
1553					struct delayed_call *done)
1554{
1555	return rawdata_get_link_base(dentry, inode, done, "abi");
1556}
1557
1558static const char *rawdata_get_link_data(struct dentry *dentry,
1559					 struct inode *inode,
1560					 struct delayed_call *done)
1561{
1562	return rawdata_get_link_base(dentry, inode, done, "raw_data");
1563}
1564
1565static const struct inode_operations rawdata_link_sha1_iops = {
1566	.get_link	= rawdata_get_link_sha1,
1567};
1568
1569static const struct inode_operations rawdata_link_abi_iops = {
1570	.get_link	= rawdata_get_link_abi,
1571};
1572static const struct inode_operations rawdata_link_data_iops = {
1573	.get_link	= rawdata_get_link_data,
1574};
1575
1576
1577/*
1578 * Requires: @profile->ns->lock held
1579 */
1580int __aafs_profile_mkdir(struct aa_profile *profile, struct dentry *parent)
1581{
1582	struct aa_profile *child;
1583	struct dentry *dent = NULL, *dir;
1584	int error;
1585
1586	AA_BUG(!profile);
1587	AA_BUG(!mutex_is_locked(&profiles_ns(profile)->lock));
1588
1589	if (!parent) {
1590		struct aa_profile *p;
1591		p = aa_deref_parent(profile);
1592		dent = prof_dir(p);
 
 
 
 
1593		/* adding to parent that previously didn't have children */
1594		dent = aafs_create_dir("profiles", dent);
1595		if (IS_ERR(dent))
1596			goto fail;
1597		prof_child_dir(p) = parent = dent;
1598	}
1599
1600	if (!profile->dirname) {
1601		int len, id_len;
1602		len = mangle_name(profile->base.name, NULL);
1603		id_len = snprintf(NULL, 0, ".%ld", profile->ns->uniq_id);
1604
1605		profile->dirname = kmalloc(len + id_len + 1, GFP_KERNEL);
1606		if (!profile->dirname) {
1607			error = -ENOMEM;
1608			goto fail2;
1609		}
1610
1611		mangle_name(profile->base.name, profile->dirname);
1612		sprintf(profile->dirname + len, ".%ld", profile->ns->uniq_id++);
1613	}
1614
1615	dent = aafs_create_dir(profile->dirname, parent);
1616	if (IS_ERR(dent))
1617		goto fail;
1618	prof_dir(profile) = dir = dent;
1619
1620	dent = create_profile_file(dir, "name", profile,
1621				   &seq_profile_name_fops);
1622	if (IS_ERR(dent))
1623		goto fail;
1624	profile->dents[AAFS_PROF_NAME] = dent;
1625
1626	dent = create_profile_file(dir, "mode", profile,
1627				   &seq_profile_mode_fops);
1628	if (IS_ERR(dent))
1629		goto fail;
1630	profile->dents[AAFS_PROF_MODE] = dent;
1631
1632	dent = create_profile_file(dir, "attach", profile,
1633				   &seq_profile_attach_fops);
1634	if (IS_ERR(dent))
1635		goto fail;
1636	profile->dents[AAFS_PROF_ATTACH] = dent;
1637
1638	if (profile->hash) {
1639		dent = create_profile_file(dir, "sha1", profile,
1640					   &seq_profile_hash_fops);
1641		if (IS_ERR(dent))
1642			goto fail;
1643		profile->dents[AAFS_PROF_HASH] = dent;
1644	}
1645
 
1646	if (profile->rawdata) {
1647		dent = aafs_create_symlink("raw_sha1", dir, NULL,
1648					   profile->label.proxy,
1649					   &rawdata_link_sha1_iops);
1650		if (IS_ERR(dent))
1651			goto fail;
1652		aa_get_proxy(profile->label.proxy);
1653		profile->dents[AAFS_PROF_RAW_HASH] = dent;
1654
1655		dent = aafs_create_symlink("raw_abi", dir, NULL,
1656					   profile->label.proxy,
1657					   &rawdata_link_abi_iops);
 
1658		if (IS_ERR(dent))
1659			goto fail;
1660		aa_get_proxy(profile->label.proxy);
1661		profile->dents[AAFS_PROF_RAW_ABI] = dent;
1662
1663		dent = aafs_create_symlink("raw_data", dir, NULL,
1664					   profile->label.proxy,
1665					   &rawdata_link_data_iops);
1666		if (IS_ERR(dent))
1667			goto fail;
1668		aa_get_proxy(profile->label.proxy);
1669		profile->dents[AAFS_PROF_RAW_DATA] = dent;
1670	}
 
1671
1672	list_for_each_entry(child, &profile->base.profiles, base.list) {
1673		error = __aafs_profile_mkdir(child, prof_child_dir(profile));
1674		if (error)
1675			goto fail2;
1676	}
1677
1678	return 0;
1679
1680fail:
1681	error = PTR_ERR(dent);
1682
1683fail2:
1684	__aafs_profile_rmdir(profile);
1685
1686	return error;
1687}
1688
1689static int ns_mkdir_op(struct inode *dir, struct dentry *dentry, umode_t mode)
 
1690{
1691	struct aa_ns *ns, *parent;
1692	/* TODO: improve permission check */
1693	struct aa_label *label;
1694	int error;
1695
1696	label = begin_current_label_crit_section();
1697	error = aa_may_manage_policy(label, NULL, AA_MAY_LOAD_POLICY);
 
1698	end_current_label_crit_section(label);
1699	if (error)
1700		return error;
1701
1702	parent = aa_get_ns(dir->i_private);
1703	AA_BUG(d_inode(ns_subns_dir(parent)) != dir);
1704
1705	/* we have to unlock and then relock to get locking order right
1706	 * for pin_fs
1707	 */
1708	inode_unlock(dir);
1709	error = simple_pin_fs(&aafs_ops, &aafs_mnt, &aafs_count);
1710	mutex_lock_nested(&parent->lock, parent->level);
1711	inode_lock_nested(dir, I_MUTEX_PARENT);
1712	if (error)
1713		goto out;
1714
1715	error = __aafs_setup_d_inode(dir, dentry, mode | S_IFDIR,  NULL,
1716				     NULL, NULL, NULL);
1717	if (error)
1718		goto out_pin;
1719
1720	ns = __aa_find_or_create_ns(parent, READ_ONCE(dentry->d_name.name),
1721				    dentry);
1722	if (IS_ERR(ns)) {
1723		error = PTR_ERR(ns);
1724		ns = NULL;
1725	}
1726
1727	aa_put_ns(ns);		/* list ref remains */
1728out_pin:
1729	if (error)
1730		simple_release_fs(&aafs_mnt, &aafs_count);
1731out:
1732	mutex_unlock(&parent->lock);
1733	aa_put_ns(parent);
1734
1735	return error;
1736}
1737
1738static int ns_rmdir_op(struct inode *dir, struct dentry *dentry)
1739{
1740	struct aa_ns *ns, *parent;
1741	/* TODO: improve permission check */
1742	struct aa_label *label;
1743	int error;
1744
1745	label = begin_current_label_crit_section();
1746	error = aa_may_manage_policy(label, NULL, AA_MAY_LOAD_POLICY);
 
1747	end_current_label_crit_section(label);
1748	if (error)
1749		return error;
1750
1751	parent = aa_get_ns(dir->i_private);
1752	/* rmdir calls the generic securityfs functions to remove files
1753	 * from the apparmor dir. It is up to the apparmor ns locking
1754	 * to avoid races.
1755	 */
1756	inode_unlock(dir);
1757	inode_unlock(dentry->d_inode);
1758
1759	mutex_lock_nested(&parent->lock, parent->level);
1760	ns = aa_get_ns(__aa_findn_ns(&parent->sub_ns, dentry->d_name.name,
1761				     dentry->d_name.len));
1762	if (!ns) {
1763		error = -ENOENT;
1764		goto out;
1765	}
1766	AA_BUG(ns_dir(ns) != dentry);
1767
1768	__aa_remove_ns(ns);
1769	aa_put_ns(ns);
1770
1771out:
1772	mutex_unlock(&parent->lock);
1773	inode_lock_nested(dir, I_MUTEX_PARENT);
1774	inode_lock(dentry->d_inode);
1775	aa_put_ns(parent);
1776
1777	return error;
1778}
1779
1780static const struct inode_operations ns_dir_inode_operations = {
1781	.lookup		= simple_lookup,
1782	.mkdir		= ns_mkdir_op,
1783	.rmdir		= ns_rmdir_op,
1784};
1785
1786static void __aa_fs_list_remove_rawdata(struct aa_ns *ns)
1787{
1788	struct aa_loaddata *ent, *tmp;
1789
1790	AA_BUG(!mutex_is_locked(&ns->lock));
1791
1792	list_for_each_entry_safe(ent, tmp, &ns->rawdata_list, list)
1793		__aa_fs_remove_rawdata(ent);
1794}
1795
1796/**
1797 *
1798 * Requires: @ns->lock held
1799 */
1800void __aafs_ns_rmdir(struct aa_ns *ns)
1801{
1802	struct aa_ns *sub;
1803	struct aa_profile *child;
1804	int i;
1805
1806	if (!ns)
1807		return;
1808	AA_BUG(!mutex_is_locked(&ns->lock));
1809
1810	list_for_each_entry(child, &ns->base.profiles, base.list)
1811		__aafs_profile_rmdir(child);
1812
1813	list_for_each_entry(sub, &ns->sub_ns, base.list) {
1814		mutex_lock_nested(&sub->lock, sub->level);
1815		__aafs_ns_rmdir(sub);
1816		mutex_unlock(&sub->lock);
1817	}
1818
1819	__aa_fs_list_remove_rawdata(ns);
1820
1821	if (ns_subns_dir(ns)) {
1822		sub = d_inode(ns_subns_dir(ns))->i_private;
1823		aa_put_ns(sub);
1824	}
1825	if (ns_subload(ns)) {
1826		sub = d_inode(ns_subload(ns))->i_private;
1827		aa_put_ns(sub);
1828	}
1829	if (ns_subreplace(ns)) {
1830		sub = d_inode(ns_subreplace(ns))->i_private;
1831		aa_put_ns(sub);
1832	}
1833	if (ns_subremove(ns)) {
1834		sub = d_inode(ns_subremove(ns))->i_private;
1835		aa_put_ns(sub);
1836	}
1837	if (ns_subrevision(ns)) {
1838		sub = d_inode(ns_subrevision(ns))->i_private;
1839		aa_put_ns(sub);
1840	}
1841
1842	for (i = AAFS_NS_SIZEOF - 1; i >= 0; --i) {
1843		aafs_remove(ns->dents[i]);
1844		ns->dents[i] = NULL;
1845	}
1846}
1847
1848/* assumes cleanup in caller */
1849static int __aafs_ns_mkdir_entries(struct aa_ns *ns, struct dentry *dir)
1850{
1851	struct dentry *dent;
1852
1853	AA_BUG(!ns);
1854	AA_BUG(!dir);
1855
1856	dent = aafs_create_dir("profiles", dir);
1857	if (IS_ERR(dent))
1858		return PTR_ERR(dent);
1859	ns_subprofs_dir(ns) = dent;
1860
1861	dent = aafs_create_dir("raw_data", dir);
1862	if (IS_ERR(dent))
1863		return PTR_ERR(dent);
1864	ns_subdata_dir(ns) = dent;
1865
1866	dent = aafs_create_file("revision", 0444, dir, ns,
1867				&aa_fs_ns_revision_fops);
1868	if (IS_ERR(dent))
1869		return PTR_ERR(dent);
1870	aa_get_ns(ns);
1871	ns_subrevision(ns) = dent;
1872
1873	dent = aafs_create_file(".load", 0640, dir, ns,
1874				      &aa_fs_profile_load);
1875	if (IS_ERR(dent))
1876		return PTR_ERR(dent);
1877	aa_get_ns(ns);
1878	ns_subload(ns) = dent;
1879
1880	dent = aafs_create_file(".replace", 0640, dir, ns,
1881				      &aa_fs_profile_replace);
1882	if (IS_ERR(dent))
1883		return PTR_ERR(dent);
1884	aa_get_ns(ns);
1885	ns_subreplace(ns) = dent;
1886
1887	dent = aafs_create_file(".remove", 0640, dir, ns,
1888				      &aa_fs_profile_remove);
1889	if (IS_ERR(dent))
1890		return PTR_ERR(dent);
1891	aa_get_ns(ns);
1892	ns_subremove(ns) = dent;
1893
1894	  /* use create_dentry so we can supply private data */
1895	dent = aafs_create("namespaces", S_IFDIR | 0755, dir, ns, NULL, NULL,
1896			   &ns_dir_inode_operations);
1897	if (IS_ERR(dent))
1898		return PTR_ERR(dent);
1899	aa_get_ns(ns);
1900	ns_subns_dir(ns) = dent;
1901
1902	return 0;
1903}
1904
1905/*
1906 * Requires: @ns->lock held
1907 */
1908int __aafs_ns_mkdir(struct aa_ns *ns, struct dentry *parent, const char *name,
1909		    struct dentry *dent)
1910{
1911	struct aa_ns *sub;
1912	struct aa_profile *child;
1913	struct dentry *dir;
1914	int error;
1915
1916	AA_BUG(!ns);
1917	AA_BUG(!parent);
1918	AA_BUG(!mutex_is_locked(&ns->lock));
1919
1920	if (!name)
1921		name = ns->base.name;
1922
1923	if (!dent) {
1924		/* create ns dir if it doesn't already exist */
1925		dent = aafs_create_dir(name, parent);
1926		if (IS_ERR(dent))
1927			goto fail;
1928	} else
1929		dget(dent);
1930	ns_dir(ns) = dir = dent;
1931	error = __aafs_ns_mkdir_entries(ns, dir);
1932	if (error)
1933		goto fail2;
1934
1935	/* profiles */
1936	list_for_each_entry(child, &ns->base.profiles, base.list) {
1937		error = __aafs_profile_mkdir(child, ns_subprofs_dir(ns));
1938		if (error)
1939			goto fail2;
1940	}
1941
1942	/* subnamespaces */
1943	list_for_each_entry(sub, &ns->sub_ns, base.list) {
1944		mutex_lock_nested(&sub->lock, sub->level);
1945		error = __aafs_ns_mkdir(sub, ns_subns_dir(ns), NULL, NULL);
1946		mutex_unlock(&sub->lock);
1947		if (error)
1948			goto fail2;
1949	}
1950
1951	return 0;
1952
1953fail:
1954	error = PTR_ERR(dent);
1955
1956fail2:
1957	__aafs_ns_rmdir(ns);
1958
1959	return error;
1960}
1961
1962
1963#define list_entry_is_head(pos, head, member) (&pos->member == (head))
1964
1965/**
1966 * __next_ns - find the next namespace to list
1967 * @root: root namespace to stop search at (NOT NULL)
1968 * @ns: current ns position (NOT NULL)
1969 *
1970 * Find the next namespace from @ns under @root and handle all locking needed
1971 * while switching current namespace.
1972 *
1973 * Returns: next namespace or NULL if at last namespace under @root
1974 * Requires: ns->parent->lock to be held
1975 * NOTE: will not unlock root->lock
1976 */
1977static struct aa_ns *__next_ns(struct aa_ns *root, struct aa_ns *ns)
1978{
1979	struct aa_ns *parent, *next;
1980
1981	AA_BUG(!root);
1982	AA_BUG(!ns);
1983	AA_BUG(ns != root && !mutex_is_locked(&ns->parent->lock));
1984
1985	/* is next namespace a child */
1986	if (!list_empty(&ns->sub_ns)) {
1987		next = list_first_entry(&ns->sub_ns, typeof(*ns), base.list);
1988		mutex_lock_nested(&next->lock, next->level);
1989		return next;
1990	}
1991
1992	/* check if the next ns is a sibling, parent, gp, .. */
1993	parent = ns->parent;
1994	while (ns != root) {
1995		mutex_unlock(&ns->lock);
1996		next = list_next_entry(ns, base.list);
1997		if (!list_entry_is_head(next, &parent->sub_ns, base.list)) {
1998			mutex_lock_nested(&next->lock, next->level);
1999			return next;
2000		}
2001		ns = parent;
2002		parent = parent->parent;
2003	}
2004
2005	return NULL;
2006}
2007
2008/**
2009 * __first_profile - find the first profile in a namespace
2010 * @root: namespace that is root of profiles being displayed (NOT NULL)
2011 * @ns: namespace to start in   (NOT NULL)
2012 *
2013 * Returns: unrefcounted profile or NULL if no profile
2014 * Requires: profile->ns.lock to be held
2015 */
2016static struct aa_profile *__first_profile(struct aa_ns *root,
2017					  struct aa_ns *ns)
2018{
2019	AA_BUG(!root);
2020	AA_BUG(ns && !mutex_is_locked(&ns->lock));
2021
2022	for (; ns; ns = __next_ns(root, ns)) {
2023		if (!list_empty(&ns->base.profiles))
2024			return list_first_entry(&ns->base.profiles,
2025						struct aa_profile, base.list);
2026	}
2027	return NULL;
2028}
2029
2030/**
2031 * __next_profile - step to the next profile in a profile tree
2032 * @profile: current profile in tree (NOT NULL)
2033 *
2034 * Perform a depth first traversal on the profile tree in a namespace
2035 *
2036 * Returns: next profile or NULL if done
2037 * Requires: profile->ns.lock to be held
2038 */
2039static struct aa_profile *__next_profile(struct aa_profile *p)
2040{
2041	struct aa_profile *parent;
2042	struct aa_ns *ns = p->ns;
2043
2044	AA_BUG(!mutex_is_locked(&profiles_ns(p)->lock));
2045
2046	/* is next profile a child */
2047	if (!list_empty(&p->base.profiles))
2048		return list_first_entry(&p->base.profiles, typeof(*p),
2049					base.list);
2050
2051	/* is next profile a sibling, parent sibling, gp, sibling, .. */
2052	parent = rcu_dereference_protected(p->parent,
2053					   mutex_is_locked(&p->ns->lock));
2054	while (parent) {
2055		p = list_next_entry(p, base.list);
2056		if (!list_entry_is_head(p, &parent->base.profiles, base.list))
2057			return p;
2058		p = parent;
2059		parent = rcu_dereference_protected(parent->parent,
2060					    mutex_is_locked(&parent->ns->lock));
2061	}
2062
2063	/* is next another profile in the namespace */
2064	p = list_next_entry(p, base.list);
2065	if (!list_entry_is_head(p, &ns->base.profiles, base.list))
2066		return p;
2067
2068	return NULL;
2069}
2070
2071/**
2072 * next_profile - step to the next profile in where ever it may be
2073 * @root: root namespace  (NOT NULL)
2074 * @profile: current profile  (NOT NULL)
2075 *
2076 * Returns: next profile or NULL if there isn't one
2077 */
2078static struct aa_profile *next_profile(struct aa_ns *root,
2079				       struct aa_profile *profile)
2080{
2081	struct aa_profile *next = __next_profile(profile);
2082	if (next)
2083		return next;
2084
2085	/* finished all profiles in namespace move to next namespace */
2086	return __first_profile(root, __next_ns(root, profile->ns));
2087}
2088
2089/**
2090 * p_start - start a depth first traversal of profile tree
2091 * @f: seq_file to fill
2092 * @pos: current position
2093 *
2094 * Returns: first profile under current namespace or NULL if none found
2095 *
2096 * acquires first ns->lock
2097 */
2098static void *p_start(struct seq_file *f, loff_t *pos)
2099{
2100	struct aa_profile *profile = NULL;
2101	struct aa_ns *root = aa_get_current_ns();
2102	loff_t l = *pos;
2103	f->private = root;
2104
2105	/* find the first profile */
2106	mutex_lock_nested(&root->lock, root->level);
2107	profile = __first_profile(root, root);
2108
2109	/* skip to position */
2110	for (; profile && l > 0; l--)
2111		profile = next_profile(root, profile);
2112
2113	return profile;
2114}
2115
2116/**
2117 * p_next - read the next profile entry
2118 * @f: seq_file to fill
2119 * @p: profile previously returned
2120 * @pos: current position
2121 *
2122 * Returns: next profile after @p or NULL if none
2123 *
2124 * may acquire/release locks in namespace tree as necessary
2125 */
2126static void *p_next(struct seq_file *f, void *p, loff_t *pos)
2127{
2128	struct aa_profile *profile = p;
2129	struct aa_ns *ns = f->private;
2130	(*pos)++;
2131
2132	return next_profile(ns, profile);
2133}
2134
2135/**
2136 * p_stop - stop depth first traversal
2137 * @f: seq_file we are filling
2138 * @p: the last profile writen
2139 *
2140 * Release all locking done by p_start/p_next on namespace tree
2141 */
2142static void p_stop(struct seq_file *f, void *p)
2143{
2144	struct aa_profile *profile = p;
2145	struct aa_ns *root = f->private, *ns;
2146
2147	if (profile) {
2148		for (ns = profile->ns; ns && ns != root; ns = ns->parent)
2149			mutex_unlock(&ns->lock);
2150	}
2151	mutex_unlock(&root->lock);
2152	aa_put_ns(root);
2153}
2154
2155/**
2156 * seq_show_profile - show a profile entry
2157 * @f: seq_file to file
2158 * @p: current position (profile)    (NOT NULL)
2159 *
2160 * Returns: error on failure
2161 */
2162static int seq_show_profile(struct seq_file *f, void *p)
2163{
2164	struct aa_profile *profile = (struct aa_profile *)p;
2165	struct aa_ns *root = f->private;
2166
2167	aa_label_seq_xprint(f, root, &profile->label,
2168			    FLAG_SHOW_MODE | FLAG_VIEW_SUBNS, GFP_KERNEL);
2169	seq_putc(f, '\n');
2170
2171	return 0;
2172}
2173
2174static const struct seq_operations aa_sfs_profiles_op = {
2175	.start = p_start,
2176	.next = p_next,
2177	.stop = p_stop,
2178	.show = seq_show_profile,
2179};
2180
2181static int profiles_open(struct inode *inode, struct file *file)
2182{
2183	if (!policy_view_capable(NULL))
2184		return -EACCES;
2185
2186	return seq_open(file, &aa_sfs_profiles_op);
2187}
2188
2189static int profiles_release(struct inode *inode, struct file *file)
2190{
2191	return seq_release(inode, file);
2192}
2193
2194static const struct file_operations aa_sfs_profiles_fops = {
2195	.open = profiles_open,
2196	.read = seq_read,
2197	.llseek = seq_lseek,
2198	.release = profiles_release,
2199};
2200
2201
2202/** Base file system setup **/
2203static struct aa_sfs_entry aa_sfs_entry_file[] = {
2204	AA_SFS_FILE_STRING("mask",
2205			   "create read write exec append mmap_exec link lock"),
2206	{ }
2207};
2208
2209static struct aa_sfs_entry aa_sfs_entry_ptrace[] = {
2210	AA_SFS_FILE_STRING("mask", "read trace"),
2211	{ }
2212};
2213
2214static struct aa_sfs_entry aa_sfs_entry_signal[] = {
2215	AA_SFS_FILE_STRING("mask", AA_SFS_SIG_MASK),
2216	{ }
2217};
2218
2219static struct aa_sfs_entry aa_sfs_entry_attach[] = {
2220	AA_SFS_FILE_BOOLEAN("xattr", 1),
2221	{ }
2222};
2223static struct aa_sfs_entry aa_sfs_entry_domain[] = {
2224	AA_SFS_FILE_BOOLEAN("change_hat",	1),
2225	AA_SFS_FILE_BOOLEAN("change_hatv",	1),
2226	AA_SFS_FILE_BOOLEAN("change_onexec",	1),
2227	AA_SFS_FILE_BOOLEAN("change_profile",	1),
2228	AA_SFS_FILE_BOOLEAN("stack",		1),
2229	AA_SFS_FILE_BOOLEAN("fix_binfmt_elf_mmap",	1),
2230	AA_SFS_FILE_BOOLEAN("post_nnp_subset",	1),
2231	AA_SFS_FILE_BOOLEAN("computed_longest_left",	1),
2232	AA_SFS_DIR("attach_conditions",		aa_sfs_entry_attach),
 
2233	AA_SFS_FILE_STRING("version", "1.2"),
2234	{ }
2235};
2236
 
 
 
 
 
2237static struct aa_sfs_entry aa_sfs_entry_versions[] = {
2238	AA_SFS_FILE_BOOLEAN("v5",	1),
2239	AA_SFS_FILE_BOOLEAN("v6",	1),
2240	AA_SFS_FILE_BOOLEAN("v7",	1),
2241	AA_SFS_FILE_BOOLEAN("v8",	1),
 
2242	{ }
2243};
2244
 
2245static struct aa_sfs_entry aa_sfs_entry_policy[] = {
2246	AA_SFS_DIR("versions",			aa_sfs_entry_versions),
2247	AA_SFS_FILE_BOOLEAN("set_load",		1),
 
 
 
 
 
 
2248	{ }
2249};
2250
2251static struct aa_sfs_entry aa_sfs_entry_mount[] = {
2252	AA_SFS_FILE_STRING("mask", "mount umount pivot_root"),
 
2253	{ }
2254};
2255
2256static struct aa_sfs_entry aa_sfs_entry_ns[] = {
2257	AA_SFS_FILE_BOOLEAN("profile",		1),
2258	AA_SFS_FILE_BOOLEAN("pivot_root",	0),
 
2259	{ }
2260};
2261
2262static struct aa_sfs_entry aa_sfs_entry_query_label[] = {
2263	AA_SFS_FILE_STRING("perms", "allow deny audit quiet"),
2264	AA_SFS_FILE_BOOLEAN("data",		1),
2265	AA_SFS_FILE_BOOLEAN("multi_transaction",	1),
2266	{ }
2267};
2268
2269static struct aa_sfs_entry aa_sfs_entry_query[] = {
2270	AA_SFS_DIR("label",			aa_sfs_entry_query_label),
2271	{ }
2272};
 
 
 
 
 
 
2273static struct aa_sfs_entry aa_sfs_entry_features[] = {
2274	AA_SFS_DIR("policy",			aa_sfs_entry_policy),
2275	AA_SFS_DIR("domain",			aa_sfs_entry_domain),
2276	AA_SFS_DIR("file",			aa_sfs_entry_file),
2277	AA_SFS_DIR("network_v8",		aa_sfs_entry_network),
2278	AA_SFS_DIR("mount",			aa_sfs_entry_mount),
2279	AA_SFS_DIR("namespaces",		aa_sfs_entry_ns),
2280	AA_SFS_FILE_U64("capability",		VFS_CAP_FLAGS_MASK),
2281	AA_SFS_DIR("rlimit",			aa_sfs_entry_rlimit),
2282	AA_SFS_DIR("caps",			aa_sfs_entry_caps),
2283	AA_SFS_DIR("ptrace",			aa_sfs_entry_ptrace),
2284	AA_SFS_DIR("signal",			aa_sfs_entry_signal),
2285	AA_SFS_DIR("query",			aa_sfs_entry_query),
 
2286	{ }
2287};
2288
2289static struct aa_sfs_entry aa_sfs_entry_apparmor[] = {
2290	AA_SFS_FILE_FOPS(".access", 0666, &aa_sfs_access),
2291	AA_SFS_FILE_FOPS(".stacked", 0444, &seq_ns_stacked_fops),
2292	AA_SFS_FILE_FOPS(".ns_stacked", 0444, &seq_ns_nsstacked_fops),
2293	AA_SFS_FILE_FOPS(".ns_level", 0444, &seq_ns_level_fops),
2294	AA_SFS_FILE_FOPS(".ns_name", 0444, &seq_ns_name_fops),
2295	AA_SFS_FILE_FOPS("profiles", 0444, &aa_sfs_profiles_fops),
 
 
2296	AA_SFS_DIR("features", aa_sfs_entry_features),
2297	{ }
2298};
2299
2300static struct aa_sfs_entry aa_sfs_entry =
2301	AA_SFS_DIR("apparmor", aa_sfs_entry_apparmor);
2302
2303/**
2304 * entry_create_file - create a file entry in the apparmor securityfs
2305 * @fs_file: aa_sfs_entry to build an entry for (NOT NULL)
2306 * @parent: the parent dentry in the securityfs
2307 *
2308 * Use entry_remove_file to remove entries created with this fn.
2309 */
2310static int __init entry_create_file(struct aa_sfs_entry *fs_file,
2311				    struct dentry *parent)
2312{
2313	int error = 0;
2314
2315	fs_file->dentry = securityfs_create_file(fs_file->name,
2316						 S_IFREG | fs_file->mode,
2317						 parent, fs_file,
2318						 fs_file->file_ops);
2319	if (IS_ERR(fs_file->dentry)) {
2320		error = PTR_ERR(fs_file->dentry);
2321		fs_file->dentry = NULL;
2322	}
2323	return error;
2324}
2325
2326static void __init entry_remove_dir(struct aa_sfs_entry *fs_dir);
2327/**
2328 * entry_create_dir - recursively create a directory entry in the securityfs
2329 * @fs_dir: aa_sfs_entry (and all child entries) to build (NOT NULL)
2330 * @parent: the parent dentry in the securityfs
2331 *
2332 * Use entry_remove_dir to remove entries created with this fn.
2333 */
2334static int __init entry_create_dir(struct aa_sfs_entry *fs_dir,
2335				   struct dentry *parent)
2336{
2337	struct aa_sfs_entry *fs_file;
2338	struct dentry *dir;
2339	int error;
2340
2341	dir = securityfs_create_dir(fs_dir->name, parent);
2342	if (IS_ERR(dir))
2343		return PTR_ERR(dir);
2344	fs_dir->dentry = dir;
2345
2346	for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) {
2347		if (fs_file->v_type == AA_SFS_TYPE_DIR)
2348			error = entry_create_dir(fs_file, fs_dir->dentry);
2349		else
2350			error = entry_create_file(fs_file, fs_dir->dentry);
2351		if (error)
2352			goto failed;
2353	}
2354
2355	return 0;
2356
2357failed:
2358	entry_remove_dir(fs_dir);
2359
2360	return error;
2361}
2362
2363/**
2364 * entry_remove_file - drop a single file entry in the apparmor securityfs
2365 * @fs_file: aa_sfs_entry to detach from the securityfs (NOT NULL)
2366 */
2367static void __init entry_remove_file(struct aa_sfs_entry *fs_file)
2368{
2369	if (!fs_file->dentry)
2370		return;
2371
2372	securityfs_remove(fs_file->dentry);
2373	fs_file->dentry = NULL;
2374}
2375
2376/**
2377 * entry_remove_dir - recursively drop a directory entry from the securityfs
2378 * @fs_dir: aa_sfs_entry (and all child entries) to detach (NOT NULL)
2379 */
2380static void __init entry_remove_dir(struct aa_sfs_entry *fs_dir)
2381{
2382	struct aa_sfs_entry *fs_file;
2383
2384	for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) {
2385		if (fs_file->v_type == AA_SFS_TYPE_DIR)
2386			entry_remove_dir(fs_file);
2387		else
2388			entry_remove_file(fs_file);
2389	}
2390
2391	entry_remove_file(fs_dir);
2392}
2393
2394/**
2395 * aa_destroy_aafs - cleanup and free aafs
2396 *
2397 * releases dentries allocated by aa_create_aafs
2398 */
2399void __init aa_destroy_aafs(void)
2400{
2401	entry_remove_dir(&aa_sfs_entry);
2402}
2403
2404
2405#define NULL_FILE_NAME ".null"
2406struct path aa_null;
2407
2408static int aa_mk_null_file(struct dentry *parent)
2409{
2410	struct vfsmount *mount = NULL;
2411	struct dentry *dentry;
2412	struct inode *inode;
2413	int count = 0;
2414	int error = simple_pin_fs(parent->d_sb->s_type, &mount, &count);
2415
2416	if (error)
2417		return error;
2418
2419	inode_lock(d_inode(parent));
2420	dentry = lookup_one_len(NULL_FILE_NAME, parent, strlen(NULL_FILE_NAME));
2421	if (IS_ERR(dentry)) {
2422		error = PTR_ERR(dentry);
2423		goto out;
2424	}
2425	inode = new_inode(parent->d_inode->i_sb);
2426	if (!inode) {
2427		error = -ENOMEM;
2428		goto out1;
2429	}
2430
2431	inode->i_ino = get_next_ino();
2432	inode->i_mode = S_IFCHR | S_IRUGO | S_IWUGO;
2433	inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
2434	init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO,
2435			   MKDEV(MEM_MAJOR, 3));
2436	d_instantiate(dentry, inode);
2437	aa_null.dentry = dget(dentry);
2438	aa_null.mnt = mntget(mount);
2439
2440	error = 0;
2441
2442out1:
2443	dput(dentry);
2444out:
2445	inode_unlock(d_inode(parent));
2446	simple_release_fs(&mount, &count);
2447	return error;
2448}
2449
2450
2451
2452static const char *policy_get_link(struct dentry *dentry,
2453				   struct inode *inode,
2454				   struct delayed_call *done)
2455{
2456	struct aa_ns *ns;
2457	struct path path;
 
2458
2459	if (!dentry)
2460		return ERR_PTR(-ECHILD);
 
2461	ns = aa_get_current_ns();
2462	path.mnt = mntget(aafs_mnt);
2463	path.dentry = dget(ns_dir(ns));
2464	nd_jump_link(&path);
2465	aa_put_ns(ns);
2466
2467	return NULL;
2468}
2469
2470static int policy_readlink(struct dentry *dentry, char __user *buffer,
2471			   int buflen)
2472{
2473	char name[32];
2474	int res;
2475
2476	res = snprintf(name, sizeof(name), "%s:[%lu]", AAFS_NAME,
2477		       d_inode(dentry)->i_ino);
2478	if (res > 0 && res < sizeof(name))
2479		res = readlink_copy(buffer, buflen, name);
2480	else
2481		res = -ENOENT;
2482
2483	return res;
2484}
2485
2486static const struct inode_operations policy_link_iops = {
2487	.readlink	= policy_readlink,
2488	.get_link	= policy_get_link,
2489};
2490
2491
2492/**
2493 * aa_create_aafs - create the apparmor security filesystem
2494 *
2495 * dentries created here are released by aa_destroy_aafs
2496 *
2497 * Returns: error on failure
2498 */
2499static int __init aa_create_aafs(void)
2500{
2501	struct dentry *dent;
2502	int error;
2503
2504	if (!apparmor_initialized)
2505		return 0;
2506
2507	if (aa_sfs_entry.dentry) {
2508		AA_ERROR("%s: AppArmor securityfs already exists\n", __func__);
2509		return -EEXIST;
2510	}
2511
2512	/* setup apparmorfs used to virtualize policy/ */
2513	aafs_mnt = kern_mount(&aafs_ops);
2514	if (IS_ERR(aafs_mnt))
2515		panic("can't set apparmorfs up\n");
2516	aafs_mnt->mnt_sb->s_flags &= ~SB_NOUSER;
2517
2518	/* Populate fs tree. */
2519	error = entry_create_dir(&aa_sfs_entry, NULL);
2520	if (error)
2521		goto error;
2522
2523	dent = securityfs_create_file(".load", 0666, aa_sfs_entry.dentry,
2524				      NULL, &aa_fs_profile_load);
2525	if (IS_ERR(dent))
2526		goto dent_error;
2527	ns_subload(root_ns) = dent;
2528
2529	dent = securityfs_create_file(".replace", 0666, aa_sfs_entry.dentry,
2530				      NULL, &aa_fs_profile_replace);
2531	if (IS_ERR(dent))
2532		goto dent_error;
2533	ns_subreplace(root_ns) = dent;
2534
2535	dent = securityfs_create_file(".remove", 0666, aa_sfs_entry.dentry,
2536				      NULL, &aa_fs_profile_remove);
2537	if (IS_ERR(dent))
2538		goto dent_error;
2539	ns_subremove(root_ns) = dent;
2540
2541	dent = securityfs_create_file("revision", 0444, aa_sfs_entry.dentry,
2542				      NULL, &aa_fs_ns_revision_fops);
2543	if (IS_ERR(dent))
2544		goto dent_error;
2545	ns_subrevision(root_ns) = dent;
2546
2547	/* policy tree referenced by magic policy symlink */
2548	mutex_lock_nested(&root_ns->lock, root_ns->level);
2549	error = __aafs_ns_mkdir(root_ns, aafs_mnt->mnt_root, ".policy",
2550				aafs_mnt->mnt_root);
2551	mutex_unlock(&root_ns->lock);
2552	if (error)
2553		goto error;
2554
2555	/* magic symlink similar to nsfs redirects based on task policy */
2556	dent = securityfs_create_symlink("policy", aa_sfs_entry.dentry,
2557					 NULL, &policy_link_iops);
2558	if (IS_ERR(dent))
2559		goto dent_error;
2560
2561	error = aa_mk_null_file(aa_sfs_entry.dentry);
2562	if (error)
2563		goto error;
2564
2565	/* TODO: add default profile to apparmorfs */
2566
2567	/* Report that AppArmor fs is enabled */
2568	aa_info_message("AppArmor Filesystem Enabled");
2569	return 0;
2570
2571dent_error:
2572	error = PTR_ERR(dent);
2573error:
2574	aa_destroy_aafs();
2575	AA_ERROR("Error creating AppArmor securityfs\n");
2576	return error;
2577}
2578
2579fs_initcall(aa_create_aafs);