John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 1 | /* |
| 2 | * AppArmor security module |
| 3 | * |
| 4 | * This file contains AppArmor policy manipulation functions |
| 5 | * |
| 6 | * Copyright (C) 1998-2008 Novell/SUSE |
| 7 | * Copyright 2009-2010 Canonical Ltd. |
| 8 | * |
| 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 |
| 12 | * License. |
| 13 | * |
| 14 | * |
| 15 | * AppArmor policy is based around profiles, which contain the rules a |
| 16 | * task is confined by. Every task in the system has a profile attached |
| 17 | * to it determined either by matching "unconfined" tasks against the |
| 18 | * visible set of profiles or by following a profiles attachment rules. |
| 19 | * |
| 20 | * Each profile exists in a profile namespace which is a container of |
| 21 | * visible profiles. Each namespace contains a special "unconfined" profile, |
| 22 | * which doesn't enforce any confinement on a task beyond DAC. |
| 23 | * |
| 24 | * Namespace and profile names can be written together in either |
| 25 | * of two syntaxes. |
| 26 | * :namespace:profile - used by kernel interfaces for easy detection |
| 27 | * namespace://profile - used by policy |
| 28 | * |
| 29 | * Profile names can not start with : or @ or ^ and may not contain \0 |
| 30 | * |
| 31 | * Reserved profile names |
| 32 | * unconfined - special automatically generated unconfined profile |
| 33 | * inherit - special name to indicate profile inheritance |
| 34 | * null-XXXX-YYYY - special automatically generated learning profiles |
| 35 | * |
| 36 | * Namespace names may not start with / or @ and may not contain \0 or : |
| 37 | * Reserved namespace names |
| 38 | * user-XXXX - user defined profiles |
| 39 | * |
| 40 | * a // in a profile or namespace name indicates a hierarchical name with the |
| 41 | * name before the // being the parent and the name after the child. |
| 42 | * |
| 43 | * Profile and namespace hierarchies serve two different but similar purposes. |
| 44 | * The namespace contains the set of visible profiles that are considered |
| 45 | * for attachment. The hierarchy of namespaces allows for virtualizing |
| 46 | * the namespace so that for example a chroot can have its own set of profiles |
| 47 | * which may define some local user namespaces. |
| 48 | * The profile hierarchy severs two distinct purposes, |
| 49 | * - it allows for sub profiles or hats, which allows an application to run |
| 50 | * subprograms under its own profile with different restriction than it |
| 51 | * self, and not have it use the system profile. |
| 52 | * eg. if a mail program starts an editor, the policy might make the |
| 53 | * restrictions tighter on the editor tighter than the mail program, |
| 54 | * and definitely different than general editor restrictions |
| 55 | * - it allows for binary hierarchy of profiles, so that execution history |
| 56 | * is preserved. This feature isn't exploited by AppArmor reference policy |
| 57 | * but is allowed. NOTE: this is currently suboptimal because profile |
| 58 | * aliasing is not currently implemented so that a profile for each |
| 59 | * level must be defined. |
| 60 | * eg. /bin/bash///bin/ls as a name would indicate /bin/ls was started |
| 61 | * from /bin/bash |
| 62 | * |
| 63 | * A profile or namespace name that can contain one or more // separators |
| 64 | * is referred to as an hname (hierarchical). |
| 65 | * eg. /bin/bash//bin/ls |
| 66 | * |
| 67 | * An fqname is a name that may contain both namespace and profile hnames. |
| 68 | * eg. :ns:/bin/bash//bin/ls |
| 69 | * |
| 70 | * NOTES: |
| 71 | * - locking of profile lists is currently fairly coarse. All profile |
| 72 | * lists within a namespace use the namespace lock. |
| 73 | * FIXME: move profile lists to using rcu_lists |
| 74 | */ |
| 75 | |
| 76 | #include <linux/slab.h> |
| 77 | #include <linux/spinlock.h> |
| 78 | #include <linux/string.h> |
| 79 | |
| 80 | #include "include/apparmor.h" |
| 81 | #include "include/capability.h" |
| 82 | #include "include/context.h" |
| 83 | #include "include/file.h" |
| 84 | #include "include/ipc.h" |
| 85 | #include "include/match.h" |
| 86 | #include "include/path.h" |
| 87 | #include "include/policy.h" |
| 88 | #include "include/policy_unpack.h" |
| 89 | #include "include/resource.h" |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 90 | |
| 91 | |
| 92 | /* root profile namespace */ |
| 93 | struct aa_namespace *root_ns; |
| 94 | |
Jan Engelhardt | 2d4cee7 | 2012-03-14 13:30:36 +0100 | [diff] [blame] | 95 | const char *const profile_mode_names[] = { |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 96 | "enforce", |
| 97 | "complain", |
| 98 | "kill", |
| 99 | }; |
| 100 | |
| 101 | /** |
| 102 | * hname_tail - find the last component of an hname |
| 103 | * @name: hname to find the base profile name component of (NOT NULL) |
| 104 | * |
| 105 | * Returns: the tail (base profile name) name component of an hname |
| 106 | */ |
| 107 | static const char *hname_tail(const char *hname) |
| 108 | { |
| 109 | char *split; |
| 110 | hname = strim((char *)hname); |
| 111 | for (split = strstr(hname, "//"); split; split = strstr(hname, "//")) |
| 112 | hname = split + 2; |
| 113 | |
| 114 | return hname; |
| 115 | } |
| 116 | |
| 117 | /** |
| 118 | * policy_init - initialize a policy structure |
| 119 | * @policy: policy to initialize (NOT NULL) |
| 120 | * @prefix: prefix name if any is required. (MAYBE NULL) |
| 121 | * @name: name of the policy, init will make a copy of it (NOT NULL) |
| 122 | * |
| 123 | * Note: this fn creates a copy of strings passed in |
| 124 | * |
| 125 | * Returns: true if policy init successful |
| 126 | */ |
| 127 | static bool policy_init(struct aa_policy *policy, const char *prefix, |
| 128 | const char *name) |
| 129 | { |
| 130 | /* freed by policy_free */ |
| 131 | if (prefix) { |
| 132 | policy->hname = kmalloc(strlen(prefix) + strlen(name) + 3, |
| 133 | GFP_KERNEL); |
| 134 | if (policy->hname) |
| 135 | sprintf(policy->hname, "%s//%s", prefix, name); |
| 136 | } else |
| 137 | policy->hname = kstrdup(name, GFP_KERNEL); |
| 138 | if (!policy->hname) |
| 139 | return 0; |
| 140 | /* base.name is a substring of fqname */ |
| 141 | policy->name = (char *)hname_tail(policy->hname); |
| 142 | INIT_LIST_HEAD(&policy->list); |
| 143 | INIT_LIST_HEAD(&policy->profiles); |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 144 | |
| 145 | return 1; |
| 146 | } |
| 147 | |
| 148 | /** |
| 149 | * policy_destroy - free the elements referenced by @policy |
| 150 | * @policy: policy that is to have its elements freed (NOT NULL) |
| 151 | */ |
| 152 | static void policy_destroy(struct aa_policy *policy) |
| 153 | { |
| 154 | /* still contains profiles -- invalid */ |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 155 | if (on_list_rcu(&policy->profiles)) { |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 156 | AA_ERROR("%s: internal error, " |
| 157 | "policy '%s' still contains profiles\n", |
| 158 | __func__, policy->name); |
| 159 | BUG(); |
| 160 | } |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 161 | if (on_list_rcu(&policy->list)) { |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 162 | AA_ERROR("%s: internal error, policy '%s' still on list\n", |
| 163 | __func__, policy->name); |
| 164 | BUG(); |
| 165 | } |
| 166 | |
| 167 | /* don't free name as its a subset of hname */ |
| 168 | kzfree(policy->hname); |
| 169 | } |
| 170 | |
| 171 | /** |
| 172 | * __policy_find - find a policy by @name on a policy list |
| 173 | * @head: list to search (NOT NULL) |
| 174 | * @name: name to search for (NOT NULL) |
| 175 | * |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 176 | * Requires: rcu_read_lock be held |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 177 | * |
| 178 | * Returns: unrefcounted policy that match @name or NULL if not found |
| 179 | */ |
| 180 | static struct aa_policy *__policy_find(struct list_head *head, const char *name) |
| 181 | { |
| 182 | struct aa_policy *policy; |
| 183 | |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 184 | list_for_each_entry_rcu(policy, head, list) { |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 185 | if (!strcmp(policy->name, name)) |
| 186 | return policy; |
| 187 | } |
| 188 | return NULL; |
| 189 | } |
| 190 | |
| 191 | /** |
| 192 | * __policy_strn_find - find a policy that's name matches @len chars of @str |
| 193 | * @head: list to search (NOT NULL) |
| 194 | * @str: string to search for (NOT NULL) |
| 195 | * @len: length of match required |
| 196 | * |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 197 | * Requires: rcu_read_lock be held |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 198 | * |
| 199 | * Returns: unrefcounted policy that match @str or NULL if not found |
| 200 | * |
| 201 | * if @len == strlen(@strlen) then this is equiv to __policy_find |
| 202 | * other wise it allows searching for policy by a partial match of name |
| 203 | */ |
| 204 | static struct aa_policy *__policy_strn_find(struct list_head *head, |
| 205 | const char *str, int len) |
| 206 | { |
| 207 | struct aa_policy *policy; |
| 208 | |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 209 | list_for_each_entry_rcu(policy, head, list) { |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 210 | if (aa_strneq(policy->name, str, len)) |
| 211 | return policy; |
| 212 | } |
| 213 | |
| 214 | return NULL; |
| 215 | } |
| 216 | |
| 217 | /* |
| 218 | * Routines for AppArmor namespaces |
| 219 | */ |
| 220 | |
| 221 | static const char *hidden_ns_name = "---"; |
| 222 | /** |
| 223 | * aa_ns_visible - test if @view is visible from @curr |
| 224 | * @curr: namespace to treat as the parent (NOT NULL) |
| 225 | * @view: namespace to test if visible from @curr (NOT NULL) |
| 226 | * |
| 227 | * Returns: true if @view is visible from @curr else false |
| 228 | */ |
| 229 | bool aa_ns_visible(struct aa_namespace *curr, struct aa_namespace *view) |
| 230 | { |
| 231 | if (curr == view) |
| 232 | return true; |
| 233 | |
| 234 | for ( ; view; view = view->parent) { |
| 235 | if (view->parent == curr) |
| 236 | return true; |
| 237 | } |
| 238 | return false; |
| 239 | } |
| 240 | |
| 241 | /** |
| 242 | * aa_na_name - Find the ns name to display for @view from @curr |
| 243 | * @curr - current namespace (NOT NULL) |
| 244 | * @view - namespace attempting to view (NOT NULL) |
| 245 | * |
| 246 | * Returns: name of @view visible from @curr |
| 247 | */ |
| 248 | const char *aa_ns_name(struct aa_namespace *curr, struct aa_namespace *view) |
| 249 | { |
| 250 | /* if view == curr then the namespace name isn't displayed */ |
| 251 | if (curr == view) |
| 252 | return ""; |
| 253 | |
| 254 | if (aa_ns_visible(curr, view)) { |
| 255 | /* at this point if a ns is visible it is in a view ns |
| 256 | * thus the curr ns.hname is a prefix of its name. |
| 257 | * Only output the virtualized portion of the name |
| 258 | * Add + 2 to skip over // separating curr hname prefix |
| 259 | * from the visible tail of the views hname |
| 260 | */ |
| 261 | return view->base.hname + strlen(curr->base.hname) + 2; |
| 262 | } else |
| 263 | return hidden_ns_name; |
| 264 | } |
| 265 | |
| 266 | /** |
| 267 | * alloc_namespace - allocate, initialize and return a new namespace |
| 268 | * @prefix: parent namespace name (MAYBE NULL) |
| 269 | * @name: a preallocated name (NOT NULL) |
| 270 | * |
| 271 | * Returns: refcounted namespace or NULL on failure. |
| 272 | */ |
| 273 | static struct aa_namespace *alloc_namespace(const char *prefix, |
| 274 | const char *name) |
| 275 | { |
| 276 | struct aa_namespace *ns; |
| 277 | |
| 278 | ns = kzalloc(sizeof(*ns), GFP_KERNEL); |
| 279 | AA_DEBUG("%s(%p)\n", __func__, ns); |
| 280 | if (!ns) |
| 281 | return NULL; |
| 282 | if (!policy_init(&ns->base, prefix, name)) |
| 283 | goto fail_ns; |
| 284 | |
| 285 | INIT_LIST_HEAD(&ns->sub_ns); |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 286 | mutex_init(&ns->lock); |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 287 | |
| 288 | /* released by free_namespace */ |
| 289 | ns->unconfined = aa_alloc_profile("unconfined"); |
| 290 | if (!ns->unconfined) |
| 291 | goto fail_unconfined; |
| 292 | |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 293 | ns->unconfined->flags = PFLAG_UNCONFINED | PFLAG_IX_ON_NAME_ERROR | |
John Johansen | fa2ac46 | 2013-07-10 21:08:43 -0700 | [diff] [blame] | 294 | PFLAG_IMMUTABLE | PFLAG_NS_COUNT; |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 295 | |
John Johansen | fa2ac46 | 2013-07-10 21:08:43 -0700 | [diff] [blame] | 296 | /* ns and ns->unconfined share ns->unconfined refcount */ |
| 297 | ns->unconfined->ns = ns; |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 298 | |
John Johansen | a498785 | 2013-02-18 16:10:34 -0800 | [diff] [blame] | 299 | atomic_set(&ns->uniq_null, 0); |
| 300 | |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 301 | return ns; |
| 302 | |
| 303 | fail_unconfined: |
wzt.wzt@gmail.com | 246c3fb | 2010-11-10 11:31:55 +0800 | [diff] [blame] | 304 | kzfree(ns->base.hname); |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 305 | fail_ns: |
| 306 | kzfree(ns); |
| 307 | return NULL; |
| 308 | } |
| 309 | |
| 310 | /** |
| 311 | * free_namespace - free a profile namespace |
| 312 | * @ns: the namespace to free (MAYBE NULL) |
| 313 | * |
| 314 | * Requires: All references to the namespace must have been put, if the |
| 315 | * namespace was referenced by a profile confining a task, |
| 316 | */ |
| 317 | static void free_namespace(struct aa_namespace *ns) |
| 318 | { |
| 319 | if (!ns) |
| 320 | return; |
| 321 | |
| 322 | policy_destroy(&ns->base); |
| 323 | aa_put_namespace(ns->parent); |
| 324 | |
John Johansen | fa2ac46 | 2013-07-10 21:08:43 -0700 | [diff] [blame] | 325 | ns->unconfined->ns = NULL; |
John Johansen | 8651e1d6 | 2013-07-10 21:11:43 -0700 | [diff] [blame^] | 326 | aa_free_profile(ns->unconfined); |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 327 | kzfree(ns); |
| 328 | } |
| 329 | |
| 330 | /** |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 331 | * __aa_find_namespace - find a namespace on a list by @name |
| 332 | * @head: list to search for namespace on (NOT NULL) |
| 333 | * @name: name of namespace to look for (NOT NULL) |
| 334 | * |
| 335 | * Returns: unrefcounted namespace |
| 336 | * |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 337 | * Requires: rcu_read_lock be held |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 338 | */ |
| 339 | static struct aa_namespace *__aa_find_namespace(struct list_head *head, |
| 340 | const char *name) |
| 341 | { |
| 342 | return (struct aa_namespace *)__policy_find(head, name); |
| 343 | } |
| 344 | |
| 345 | /** |
| 346 | * aa_find_namespace - look up a profile namespace on the namespace list |
| 347 | * @root: namespace to search in (NOT NULL) |
| 348 | * @name: name of namespace to find (NOT NULL) |
| 349 | * |
| 350 | * Returns: a refcounted namespace on the list, or NULL if no namespace |
| 351 | * called @name exists. |
| 352 | * |
| 353 | * refcount released by caller |
| 354 | */ |
| 355 | struct aa_namespace *aa_find_namespace(struct aa_namespace *root, |
| 356 | const char *name) |
| 357 | { |
| 358 | struct aa_namespace *ns = NULL; |
| 359 | |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 360 | rcu_read_lock(); |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 361 | ns = aa_get_namespace(__aa_find_namespace(&root->sub_ns, name)); |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 362 | rcu_read_unlock(); |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 363 | |
| 364 | return ns; |
| 365 | } |
| 366 | |
| 367 | /** |
| 368 | * aa_prepare_namespace - find an existing or create a new namespace of @name |
| 369 | * @name: the namespace to find or add (MAYBE NULL) |
| 370 | * |
| 371 | * Returns: refcounted namespace or NULL if failed to create one |
| 372 | */ |
| 373 | static struct aa_namespace *aa_prepare_namespace(const char *name) |
| 374 | { |
| 375 | struct aa_namespace *ns, *root; |
| 376 | |
| 377 | root = aa_current_profile()->ns; |
| 378 | |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 379 | mutex_lock(&root->lock); |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 380 | |
| 381 | /* if name isn't specified the profile is loaded to the current ns */ |
| 382 | if (!name) { |
| 383 | /* released by caller */ |
| 384 | ns = aa_get_namespace(root); |
| 385 | goto out; |
| 386 | } |
| 387 | |
| 388 | /* try and find the specified ns and if it doesn't exist create it */ |
| 389 | /* released by caller */ |
| 390 | ns = aa_get_namespace(__aa_find_namespace(&root->sub_ns, name)); |
| 391 | if (!ns) { |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 392 | ns = alloc_namespace(root->base.hname, name); |
| 393 | if (!ns) |
| 394 | goto out; |
| 395 | /* add parent ref */ |
| 396 | ns->parent = aa_get_namespace(root); |
| 397 | list_add_rcu(&ns->base.list, &root->sub_ns); |
| 398 | /* add list ref */ |
| 399 | aa_get_namespace(ns); |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 400 | } |
| 401 | out: |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 402 | mutex_unlock(&root->lock); |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 403 | |
| 404 | /* return ref */ |
| 405 | return ns; |
| 406 | } |
| 407 | |
| 408 | /** |
| 409 | * __list_add_profile - add a profile to a list |
| 410 | * @list: list to add it to (NOT NULL) |
| 411 | * @profile: the profile to add (NOT NULL) |
| 412 | * |
| 413 | * refcount @profile, should be put by __list_remove_profile |
| 414 | * |
| 415 | * Requires: namespace lock be held, or list not be shared |
| 416 | */ |
| 417 | static void __list_add_profile(struct list_head *list, |
| 418 | struct aa_profile *profile) |
| 419 | { |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 420 | list_add_rcu(&profile->base.list, list); |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 421 | /* get list reference */ |
| 422 | aa_get_profile(profile); |
| 423 | } |
| 424 | |
| 425 | /** |
| 426 | * __list_remove_profile - remove a profile from the list it is on |
| 427 | * @profile: the profile to remove (NOT NULL) |
| 428 | * |
| 429 | * remove a profile from the list, warning generally removal should |
| 430 | * be done with __replace_profile as most profile removals are |
| 431 | * replacements to the unconfined profile. |
| 432 | * |
| 433 | * put @profile list refcount |
| 434 | * |
| 435 | * Requires: namespace lock be held, or list not have been live |
| 436 | */ |
| 437 | static void __list_remove_profile(struct aa_profile *profile) |
| 438 | { |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 439 | list_del_rcu(&profile->base.list); |
| 440 | aa_put_profile(profile); |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 441 | } |
| 442 | |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 443 | static void __profile_list_release(struct list_head *head); |
| 444 | |
| 445 | /** |
| 446 | * __remove_profile - remove old profile, and children |
| 447 | * @profile: profile to be replaced (NOT NULL) |
| 448 | * |
| 449 | * Requires: namespace list lock be held, or list not be shared |
| 450 | */ |
| 451 | static void __remove_profile(struct aa_profile *profile) |
| 452 | { |
| 453 | /* release any children lists first */ |
| 454 | __profile_list_release(&profile->base.profiles); |
| 455 | /* released by free_profile */ |
John Johansen | 77b071b | 2013-07-10 21:07:43 -0700 | [diff] [blame] | 456 | __aa_update_replacedby(profile, profile->ns->unconfined); |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 457 | __list_remove_profile(profile); |
| 458 | } |
| 459 | |
| 460 | /** |
| 461 | * __profile_list_release - remove all profiles on the list and put refs |
| 462 | * @head: list of profiles (NOT NULL) |
| 463 | * |
| 464 | * Requires: namespace lock be held |
| 465 | */ |
| 466 | static void __profile_list_release(struct list_head *head) |
| 467 | { |
| 468 | struct aa_profile *profile, *tmp; |
| 469 | list_for_each_entry_safe(profile, tmp, head, base.list) |
| 470 | __remove_profile(profile); |
| 471 | } |
| 472 | |
| 473 | static void __ns_list_release(struct list_head *head); |
| 474 | |
| 475 | /** |
| 476 | * destroy_namespace - remove everything contained by @ns |
| 477 | * @ns: namespace to have it contents removed (NOT NULL) |
| 478 | */ |
| 479 | static void destroy_namespace(struct aa_namespace *ns) |
| 480 | { |
| 481 | if (!ns) |
| 482 | return; |
| 483 | |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 484 | mutex_lock(&ns->lock); |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 485 | /* release all profiles in this namespace */ |
| 486 | __profile_list_release(&ns->base.profiles); |
| 487 | |
| 488 | /* release all sub namespaces */ |
| 489 | __ns_list_release(&ns->sub_ns); |
| 490 | |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 491 | if (ns->parent) |
John Johansen | fa2ac46 | 2013-07-10 21:08:43 -0700 | [diff] [blame] | 492 | __aa_update_replacedby(ns->unconfined, ns->parent->unconfined); |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 493 | mutex_unlock(&ns->lock); |
| 494 | } |
| 495 | |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 496 | /** |
| 497 | * __remove_namespace - remove a namespace and all its children |
| 498 | * @ns: namespace to be removed (NOT NULL) |
| 499 | * |
| 500 | * Requires: ns->parent->lock be held and ns removed from parent. |
| 501 | */ |
| 502 | static void __remove_namespace(struct aa_namespace *ns) |
| 503 | { |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 504 | /* remove ns from namespace list */ |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 505 | list_del_rcu(&ns->base.list); |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 506 | destroy_namespace(ns); |
John Johansen | fa2ac46 | 2013-07-10 21:08:43 -0700 | [diff] [blame] | 507 | aa_put_namespace(ns); |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 508 | } |
| 509 | |
| 510 | /** |
| 511 | * __ns_list_release - remove all profile namespaces on the list put refs |
| 512 | * @head: list of profile namespaces (NOT NULL) |
| 513 | * |
| 514 | * Requires: namespace lock be held |
| 515 | */ |
| 516 | static void __ns_list_release(struct list_head *head) |
| 517 | { |
| 518 | struct aa_namespace *ns, *tmp; |
| 519 | list_for_each_entry_safe(ns, tmp, head, base.list) |
| 520 | __remove_namespace(ns); |
| 521 | |
| 522 | } |
| 523 | |
| 524 | /** |
| 525 | * aa_alloc_root_ns - allocate the root profile namespace |
| 526 | * |
| 527 | * Returns: %0 on success else error |
| 528 | * |
| 529 | */ |
| 530 | int __init aa_alloc_root_ns(void) |
| 531 | { |
| 532 | /* released by aa_free_root_ns - used as list ref*/ |
| 533 | root_ns = alloc_namespace(NULL, "root"); |
| 534 | if (!root_ns) |
| 535 | return -ENOMEM; |
| 536 | |
| 537 | return 0; |
| 538 | } |
| 539 | |
| 540 | /** |
| 541 | * aa_free_root_ns - free the root profile namespace |
| 542 | */ |
| 543 | void __init aa_free_root_ns(void) |
| 544 | { |
| 545 | struct aa_namespace *ns = root_ns; |
| 546 | root_ns = NULL; |
| 547 | |
| 548 | destroy_namespace(ns); |
| 549 | aa_put_namespace(ns); |
| 550 | } |
| 551 | |
John Johansen | 77b071b | 2013-07-10 21:07:43 -0700 | [diff] [blame] | 552 | |
| 553 | static void free_replacedby(struct aa_replacedby *r) |
| 554 | { |
| 555 | if (r) { |
| 556 | aa_put_profile(rcu_dereference(r->profile)); |
| 557 | kzfree(r); |
| 558 | } |
| 559 | } |
| 560 | |
| 561 | |
| 562 | void aa_free_replacedby_kref(struct kref *kref) |
| 563 | { |
| 564 | struct aa_replacedby *r = container_of(kref, struct aa_replacedby, |
| 565 | count); |
| 566 | free_replacedby(r); |
| 567 | } |
| 568 | |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 569 | /** |
John Johansen | 8651e1d6 | 2013-07-10 21:11:43 -0700 | [diff] [blame^] | 570 | * aa_free_profile - free a profile |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 571 | * @profile: the profile to free (MAYBE NULL) |
| 572 | * |
| 573 | * Free a profile, its hats and null_profile. All references to the profile, |
| 574 | * its hats and null_profile must have been put. |
| 575 | * |
| 576 | * If the profile was referenced from a task context, free_profile() will |
| 577 | * be called from an rcu callback routine, so we must not sleep here. |
| 578 | */ |
John Johansen | 8651e1d6 | 2013-07-10 21:11:43 -0700 | [diff] [blame^] | 579 | void aa_free_profile(struct aa_profile *profile) |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 580 | { |
| 581 | AA_DEBUG("%s(%p)\n", __func__, profile); |
| 582 | |
| 583 | if (!profile) |
| 584 | return; |
| 585 | |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 586 | /* free children profiles */ |
| 587 | policy_destroy(&profile->base); |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 588 | aa_put_profile(rcu_access_pointer(profile->parent)); |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 589 | |
| 590 | aa_put_namespace(profile->ns); |
| 591 | kzfree(profile->rename); |
| 592 | |
| 593 | aa_free_file_rules(&profile->file); |
| 594 | aa_free_cap_rules(&profile->caps); |
| 595 | aa_free_rlimit_rules(&profile->rlimits); |
| 596 | |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 597 | aa_put_dfa(profile->xmatch); |
John Johansen | ad5ff3d | 2012-02-16 07:07:53 -0800 | [diff] [blame] | 598 | aa_put_dfa(profile->policy.dfa); |
John Johansen | 77b071b | 2013-07-10 21:07:43 -0700 | [diff] [blame] | 599 | aa_put_replacedby(profile->replacedby); |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 600 | |
| 601 | kzfree(profile); |
| 602 | } |
| 603 | |
| 604 | /** |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 605 | * aa_free_profile_rcu - free aa_profile by rcu (called by aa_free_profile_kref) |
| 606 | * @head: rcu_head callback for freeing of a profile (NOT NULL) |
| 607 | */ |
| 608 | static void aa_free_profile_rcu(struct rcu_head *head) |
| 609 | { |
John Johansen | 742058b | 2013-07-10 21:10:43 -0700 | [diff] [blame] | 610 | struct aa_profile *p = container_of(head, struct aa_profile, rcu); |
| 611 | if (p->flags & PFLAG_NS_COUNT) |
| 612 | free_namespace(p->ns); |
| 613 | else |
John Johansen | 8651e1d6 | 2013-07-10 21:11:43 -0700 | [diff] [blame^] | 614 | aa_free_profile(p); |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 615 | } |
| 616 | |
| 617 | /** |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 618 | * aa_free_profile_kref - free aa_profile by kref (called by aa_put_profile) |
| 619 | * @kr: kref callback for freeing of a profile (NOT NULL) |
| 620 | */ |
| 621 | void aa_free_profile_kref(struct kref *kref) |
| 622 | { |
John Johansen | fa2ac46 | 2013-07-10 21:08:43 -0700 | [diff] [blame] | 623 | struct aa_profile *p = container_of(kref, struct aa_profile, count); |
John Johansen | 742058b | 2013-07-10 21:10:43 -0700 | [diff] [blame] | 624 | call_rcu(&p->rcu, aa_free_profile_rcu); |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 625 | } |
| 626 | |
John Johansen | 4da05cc | 2013-02-18 16:11:34 -0800 | [diff] [blame] | 627 | /** |
| 628 | * aa_alloc_profile - allocate, initialize and return a new profile |
| 629 | * @hname: name of the profile (NOT NULL) |
| 630 | * |
| 631 | * Returns: refcount profile or NULL on failure |
| 632 | */ |
| 633 | struct aa_profile *aa_alloc_profile(const char *hname) |
| 634 | { |
| 635 | struct aa_profile *profile; |
| 636 | |
| 637 | /* freed by free_profile - usually through aa_put_profile */ |
| 638 | profile = kzalloc(sizeof(*profile), GFP_KERNEL); |
| 639 | if (!profile) |
| 640 | return NULL; |
| 641 | |
John Johansen | 77b071b | 2013-07-10 21:07:43 -0700 | [diff] [blame] | 642 | profile->replacedby = kzalloc(sizeof(struct aa_replacedby), GFP_KERNEL); |
| 643 | if (!profile->replacedby) |
| 644 | goto fail; |
| 645 | kref_init(&profile->replacedby->count); |
| 646 | |
| 647 | if (!policy_init(&profile->base, NULL, hname)) |
| 648 | goto fail; |
John Johansen | fa2ac46 | 2013-07-10 21:08:43 -0700 | [diff] [blame] | 649 | kref_init(&profile->count); |
John Johansen | 4da05cc | 2013-02-18 16:11:34 -0800 | [diff] [blame] | 650 | |
| 651 | /* refcount released by caller */ |
| 652 | return profile; |
John Johansen | 77b071b | 2013-07-10 21:07:43 -0700 | [diff] [blame] | 653 | |
| 654 | fail: |
| 655 | kzfree(profile->replacedby); |
| 656 | kzfree(profile); |
| 657 | |
| 658 | return NULL; |
John Johansen | 4da05cc | 2013-02-18 16:11:34 -0800 | [diff] [blame] | 659 | } |
| 660 | |
| 661 | /** |
| 662 | * aa_new_null_profile - create a new null-X learning profile |
| 663 | * @parent: profile that caused this profile to be created (NOT NULL) |
| 664 | * @hat: true if the null- learning profile is a hat |
| 665 | * |
| 666 | * Create a null- complain mode profile used in learning mode. The name of |
| 667 | * the profile is unique and follows the format of parent//null-<uniq>. |
| 668 | * |
| 669 | * null profiles are added to the profile list but the list does not |
| 670 | * hold a count on them so that they are automatically released when |
| 671 | * not in use. |
| 672 | * |
| 673 | * Returns: new refcounted profile else NULL on failure |
| 674 | */ |
| 675 | struct aa_profile *aa_new_null_profile(struct aa_profile *parent, int hat) |
| 676 | { |
| 677 | struct aa_profile *profile = NULL; |
| 678 | char *name; |
| 679 | int uniq = atomic_inc_return(&parent->ns->uniq_null); |
| 680 | |
| 681 | /* freed below */ |
| 682 | name = kmalloc(strlen(parent->base.hname) + 2 + 7 + 8, GFP_KERNEL); |
| 683 | if (!name) |
| 684 | goto fail; |
| 685 | sprintf(name, "%s//null-%x", parent->base.hname, uniq); |
| 686 | |
| 687 | profile = aa_alloc_profile(name); |
| 688 | kfree(name); |
| 689 | if (!profile) |
| 690 | goto fail; |
| 691 | |
| 692 | profile->mode = APPARMOR_COMPLAIN; |
| 693 | profile->flags = PFLAG_NULL; |
| 694 | if (hat) |
| 695 | profile->flags |= PFLAG_HAT; |
| 696 | |
| 697 | /* released on free_profile */ |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 698 | rcu_assign_pointer(profile->parent, aa_get_profile(parent)); |
John Johansen | 4da05cc | 2013-02-18 16:11:34 -0800 | [diff] [blame] | 699 | profile->ns = aa_get_namespace(parent->ns); |
| 700 | |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 701 | mutex_lock(&profile->ns->lock); |
John Johansen | 4da05cc | 2013-02-18 16:11:34 -0800 | [diff] [blame] | 702 | __list_add_profile(&parent->base.profiles, profile); |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 703 | mutex_unlock(&profile->ns->lock); |
John Johansen | 4da05cc | 2013-02-18 16:11:34 -0800 | [diff] [blame] | 704 | |
| 705 | /* refcount released by caller */ |
| 706 | return profile; |
| 707 | |
| 708 | fail: |
| 709 | return NULL; |
| 710 | } |
| 711 | |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 712 | /* TODO: profile accounting - setup in remove */ |
| 713 | |
| 714 | /** |
| 715 | * __find_child - find a profile on @head list with a name matching @name |
| 716 | * @head: list to search (NOT NULL) |
| 717 | * @name: name of profile (NOT NULL) |
| 718 | * |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 719 | * Requires: rcu_read_lock be held |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 720 | * |
| 721 | * Returns: unrefcounted profile ptr, or NULL if not found |
| 722 | */ |
| 723 | static struct aa_profile *__find_child(struct list_head *head, const char *name) |
| 724 | { |
| 725 | return (struct aa_profile *)__policy_find(head, name); |
| 726 | } |
| 727 | |
| 728 | /** |
| 729 | * __strn_find_child - find a profile on @head list using substring of @name |
| 730 | * @head: list to search (NOT NULL) |
| 731 | * @name: name of profile (NOT NULL) |
| 732 | * @len: length of @name substring to match |
| 733 | * |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 734 | * Requires: rcu_read_lock be held |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 735 | * |
| 736 | * Returns: unrefcounted profile ptr, or NULL if not found |
| 737 | */ |
| 738 | static struct aa_profile *__strn_find_child(struct list_head *head, |
| 739 | const char *name, int len) |
| 740 | { |
| 741 | return (struct aa_profile *)__policy_strn_find(head, name, len); |
| 742 | } |
| 743 | |
| 744 | /** |
| 745 | * aa_find_child - find a profile by @name in @parent |
| 746 | * @parent: profile to search (NOT NULL) |
| 747 | * @name: profile name to search for (NOT NULL) |
| 748 | * |
| 749 | * Returns: a refcounted profile or NULL if not found |
| 750 | */ |
| 751 | struct aa_profile *aa_find_child(struct aa_profile *parent, const char *name) |
| 752 | { |
| 753 | struct aa_profile *profile; |
| 754 | |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 755 | rcu_read_lock(); |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 756 | profile = aa_get_profile(__find_child(&parent->base.profiles, name)); |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 757 | rcu_read_unlock(); |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 758 | |
| 759 | /* refcount released by caller */ |
| 760 | return profile; |
| 761 | } |
| 762 | |
| 763 | /** |
| 764 | * __lookup_parent - lookup the parent of a profile of name @hname |
| 765 | * @ns: namespace to lookup profile in (NOT NULL) |
| 766 | * @hname: hierarchical profile name to find parent of (NOT NULL) |
| 767 | * |
| 768 | * Lookups up the parent of a fully qualified profile name, the profile |
| 769 | * that matches hname does not need to exist, in general this |
| 770 | * is used to load a new profile. |
| 771 | * |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 772 | * Requires: rcu_read_lock be held |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 773 | * |
| 774 | * Returns: unrefcounted policy or NULL if not found |
| 775 | */ |
| 776 | static struct aa_policy *__lookup_parent(struct aa_namespace *ns, |
| 777 | const char *hname) |
| 778 | { |
| 779 | struct aa_policy *policy; |
| 780 | struct aa_profile *profile = NULL; |
| 781 | char *split; |
| 782 | |
| 783 | policy = &ns->base; |
| 784 | |
| 785 | for (split = strstr(hname, "//"); split;) { |
| 786 | profile = __strn_find_child(&policy->profiles, hname, |
| 787 | split - hname); |
| 788 | if (!profile) |
| 789 | return NULL; |
| 790 | policy = &profile->base; |
| 791 | hname = split + 2; |
| 792 | split = strstr(hname, "//"); |
| 793 | } |
| 794 | if (!profile) |
| 795 | return &ns->base; |
| 796 | return &profile->base; |
| 797 | } |
| 798 | |
| 799 | /** |
| 800 | * __lookup_profile - lookup the profile matching @hname |
| 801 | * @base: base list to start looking up profile name from (NOT NULL) |
| 802 | * @hname: hierarchical profile name (NOT NULL) |
| 803 | * |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 804 | * Requires: rcu_read_lock be held |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 805 | * |
| 806 | * Returns: unrefcounted profile pointer or NULL if not found |
| 807 | * |
| 808 | * Do a relative name lookup, recursing through profile tree. |
| 809 | */ |
| 810 | static struct aa_profile *__lookup_profile(struct aa_policy *base, |
| 811 | const char *hname) |
| 812 | { |
| 813 | struct aa_profile *profile = NULL; |
| 814 | char *split; |
| 815 | |
| 816 | for (split = strstr(hname, "//"); split;) { |
| 817 | profile = __strn_find_child(&base->profiles, hname, |
| 818 | split - hname); |
| 819 | if (!profile) |
| 820 | return NULL; |
| 821 | |
| 822 | base = &profile->base; |
| 823 | hname = split + 2; |
| 824 | split = strstr(hname, "//"); |
| 825 | } |
| 826 | |
| 827 | profile = __find_child(&base->profiles, hname); |
| 828 | |
| 829 | return profile; |
| 830 | } |
| 831 | |
| 832 | /** |
| 833 | * aa_lookup_profile - find a profile by its full or partial name |
| 834 | * @ns: the namespace to start from (NOT NULL) |
| 835 | * @hname: name to do lookup on. Does not contain namespace prefix (NOT NULL) |
| 836 | * |
| 837 | * Returns: refcounted profile or NULL if not found |
| 838 | */ |
| 839 | struct aa_profile *aa_lookup_profile(struct aa_namespace *ns, const char *hname) |
| 840 | { |
| 841 | struct aa_profile *profile; |
| 842 | |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 843 | rcu_read_lock(); |
| 844 | do { |
| 845 | profile = __lookup_profile(&ns->base, hname); |
| 846 | } while (profile && !aa_get_profile_not0(profile)); |
| 847 | rcu_read_unlock(); |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 848 | |
John Johansen | bf83208 | 2012-05-16 11:00:05 -0700 | [diff] [blame] | 849 | /* the unconfined profile is not in the regular profile list */ |
| 850 | if (!profile && strcmp(hname, "unconfined") == 0) |
John Johansen | fa2ac46 | 2013-07-10 21:08:43 -0700 | [diff] [blame] | 851 | profile = aa_get_newest_profile(ns->unconfined); |
John Johansen | bf83208 | 2012-05-16 11:00:05 -0700 | [diff] [blame] | 852 | |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 853 | /* refcount released by caller */ |
| 854 | return profile; |
| 855 | } |
| 856 | |
| 857 | /** |
| 858 | * replacement_allowed - test to see if replacement is allowed |
| 859 | * @profile: profile to test if it can be replaced (MAYBE NULL) |
| 860 | * @noreplace: true if replacement shouldn't be allowed but addition is okay |
| 861 | * @info: Returns - info about why replacement failed (NOT NULL) |
| 862 | * |
| 863 | * Returns: %0 if replacement allowed else error code |
| 864 | */ |
| 865 | static int replacement_allowed(struct aa_profile *profile, int noreplace, |
| 866 | const char **info) |
| 867 | { |
| 868 | if (profile) { |
| 869 | if (profile->flags & PFLAG_IMMUTABLE) { |
| 870 | *info = "cannot replace immutible profile"; |
| 871 | return -EPERM; |
| 872 | } else if (noreplace) { |
| 873 | *info = "profile already exists"; |
| 874 | return -EEXIST; |
| 875 | } |
| 876 | } |
| 877 | return 0; |
| 878 | } |
| 879 | |
| 880 | /** |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 881 | * aa_audit_policy - Do auditing of policy changes |
| 882 | * @op: policy operation being performed |
| 883 | * @gfp: memory allocation flags |
| 884 | * @name: name of profile being manipulated (NOT NULL) |
| 885 | * @info: any extra information to be audited (MAYBE NULL) |
| 886 | * @error: error code |
| 887 | * |
| 888 | * Returns: the error to be returned after audit is done |
| 889 | */ |
| 890 | static int audit_policy(int op, gfp_t gfp, const char *name, const char *info, |
| 891 | int error) |
| 892 | { |
| 893 | struct common_audit_data sa; |
Eric Paris | 3b3b0e4 | 2012-04-03 09:37:02 -0700 | [diff] [blame] | 894 | struct apparmor_audit_data aad = {0,}; |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 895 | sa.type = LSM_AUDIT_DATA_NONE; |
Eric Paris | 3b3b0e4 | 2012-04-03 09:37:02 -0700 | [diff] [blame] | 896 | sa.aad = &aad; |
| 897 | aad.op = op; |
| 898 | aad.name = name; |
| 899 | aad.info = info; |
| 900 | aad.error = error; |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 901 | |
| 902 | return aa_audit(AUDIT_APPARMOR_STATUS, __aa_current_profile(), gfp, |
| 903 | &sa, NULL); |
| 904 | } |
| 905 | |
| 906 | /** |
| 907 | * aa_may_manage_policy - can the current task manage policy |
| 908 | * @op: the policy manipulation operation being done |
| 909 | * |
| 910 | * Returns: true if the task is allowed to manipulate policy |
| 911 | */ |
| 912 | bool aa_may_manage_policy(int op) |
| 913 | { |
| 914 | /* check if loading policy is locked out */ |
| 915 | if (aa_g_lock_policy) { |
| 916 | audit_policy(op, GFP_KERNEL, NULL, "policy_locked", -EACCES); |
| 917 | return 0; |
| 918 | } |
| 919 | |
| 920 | if (!capable(CAP_MAC_ADMIN)) { |
| 921 | audit_policy(op, GFP_KERNEL, NULL, "not policy admin", -EACCES); |
| 922 | return 0; |
| 923 | } |
| 924 | |
| 925 | return 1; |
| 926 | } |
| 927 | |
John Johansen | dd51c848 | 2013-07-10 21:05:43 -0700 | [diff] [blame] | 928 | static struct aa_profile *__list_lookup_parent(struct list_head *lh, |
| 929 | struct aa_profile *profile) |
| 930 | { |
| 931 | const char *base = hname_tail(profile->base.hname); |
| 932 | long len = base - profile->base.hname; |
| 933 | struct aa_load_ent *ent; |
| 934 | |
| 935 | /* parent won't have trailing // so remove from len */ |
| 936 | if (len <= 2) |
| 937 | return NULL; |
| 938 | len -= 2; |
| 939 | |
| 940 | list_for_each_entry(ent, lh, list) { |
| 941 | if (ent->new == profile) |
| 942 | continue; |
| 943 | if (strncmp(ent->new->base.hname, profile->base.hname, len) == |
| 944 | 0 && ent->new->base.hname[len] == 0) |
| 945 | return ent->new; |
| 946 | } |
| 947 | |
| 948 | return NULL; |
| 949 | } |
| 950 | |
| 951 | /** |
| 952 | * __replace_profile - replace @old with @new on a list |
| 953 | * @old: profile to be replaced (NOT NULL) |
| 954 | * @new: profile to replace @old with (NOT NULL) |
John Johansen | 77b071b | 2013-07-10 21:07:43 -0700 | [diff] [blame] | 955 | * @share_replacedby: transfer @old->replacedby to @new |
John Johansen | dd51c848 | 2013-07-10 21:05:43 -0700 | [diff] [blame] | 956 | * |
| 957 | * Will duplicate and refcount elements that @new inherits from @old |
| 958 | * and will inherit @old children. |
| 959 | * |
| 960 | * refcount @new for list, put @old list refcount |
| 961 | * |
| 962 | * Requires: namespace list lock be held, or list not be shared |
| 963 | */ |
John Johansen | 77b071b | 2013-07-10 21:07:43 -0700 | [diff] [blame] | 964 | static void __replace_profile(struct aa_profile *old, struct aa_profile *new, |
| 965 | bool share_replacedby) |
John Johansen | dd51c848 | 2013-07-10 21:05:43 -0700 | [diff] [blame] | 966 | { |
| 967 | struct aa_profile *child, *tmp; |
| 968 | |
| 969 | if (!list_empty(&old->base.profiles)) { |
| 970 | LIST_HEAD(lh); |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 971 | list_splice_init_rcu(&old->base.profiles, &lh, synchronize_rcu); |
John Johansen | dd51c848 | 2013-07-10 21:05:43 -0700 | [diff] [blame] | 972 | |
| 973 | list_for_each_entry_safe(child, tmp, &lh, base.list) { |
| 974 | struct aa_profile *p; |
| 975 | |
| 976 | list_del_init(&child->base.list); |
| 977 | p = __find_child(&new->base.profiles, child->base.name); |
| 978 | if (p) { |
| 979 | /* @p replaces @child */ |
John Johansen | 77b071b | 2013-07-10 21:07:43 -0700 | [diff] [blame] | 980 | __replace_profile(child, p, share_replacedby); |
John Johansen | dd51c848 | 2013-07-10 21:05:43 -0700 | [diff] [blame] | 981 | continue; |
| 982 | } |
| 983 | |
| 984 | /* inherit @child and its children */ |
| 985 | /* TODO: update hname of inherited children */ |
| 986 | /* list refcount transferred to @new */ |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 987 | p = rcu_dereference_protected(child->parent, |
| 988 | mutex_is_locked(&child->ns->lock)); |
| 989 | rcu_assign_pointer(child->parent, aa_get_profile(new)); |
| 990 | list_add_rcu(&child->base.list, &new->base.profiles); |
| 991 | aa_put_profile(p); |
John Johansen | dd51c848 | 2013-07-10 21:05:43 -0700 | [diff] [blame] | 992 | } |
| 993 | } |
| 994 | |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 995 | if (!rcu_access_pointer(new->parent)) { |
| 996 | struct aa_profile *parent = rcu_dereference(old->parent); |
| 997 | rcu_assign_pointer(new->parent, aa_get_profile(parent)); |
| 998 | } |
John Johansen | 77b071b | 2013-07-10 21:07:43 -0700 | [diff] [blame] | 999 | __aa_update_replacedby(old, new); |
| 1000 | if (share_replacedby) { |
| 1001 | aa_put_replacedby(new->replacedby); |
| 1002 | new->replacedby = aa_get_replacedby(old->replacedby); |
| 1003 | } |
John Johansen | dd51c848 | 2013-07-10 21:05:43 -0700 | [diff] [blame] | 1004 | |
| 1005 | if (list_empty(&new->base.list)) { |
| 1006 | /* new is not on a list already */ |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 1007 | list_replace_rcu(&old->base.list, &new->base.list); |
John Johansen | dd51c848 | 2013-07-10 21:05:43 -0700 | [diff] [blame] | 1008 | aa_get_profile(new); |
| 1009 | aa_put_profile(old); |
| 1010 | } else |
| 1011 | __list_remove_profile(old); |
| 1012 | } |
| 1013 | |
| 1014 | /** |
| 1015 | * __lookup_replace - lookup replacement information for a profile |
| 1016 | * @ns - namespace the lookup occurs in |
| 1017 | * @hname - name of profile to lookup |
| 1018 | * @noreplace - true if not replacing an existing profile |
| 1019 | * @p - Returns: profile to be replaced |
| 1020 | * @info - Returns: info string on why lookup failed |
| 1021 | * |
| 1022 | * Returns: profile to replace (no ref) on success else ptr error |
| 1023 | */ |
| 1024 | static int __lookup_replace(struct aa_namespace *ns, const char *hname, |
| 1025 | bool noreplace, struct aa_profile **p, |
| 1026 | const char **info) |
| 1027 | { |
| 1028 | *p = aa_get_profile(__lookup_profile(&ns->base, hname)); |
| 1029 | if (*p) { |
| 1030 | int error = replacement_allowed(*p, noreplace, info); |
| 1031 | if (error) { |
| 1032 | *info = "profile can not be replaced"; |
| 1033 | return error; |
| 1034 | } |
| 1035 | } |
| 1036 | |
| 1037 | return 0; |
| 1038 | } |
| 1039 | |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 1040 | /** |
| 1041 | * aa_replace_profiles - replace profile(s) on the profile list |
| 1042 | * @udata: serialized data stream (NOT NULL) |
| 1043 | * @size: size of the serialized data stream |
| 1044 | * @noreplace: true if only doing addition, no replacement allowed |
| 1045 | * |
| 1046 | * unpack and replace a profile on the profile list and uses of that profile |
| 1047 | * by any aa_task_cxt. If the profile does not exist on the profile list |
| 1048 | * it is added. |
| 1049 | * |
| 1050 | * Returns: size of data consumed else error code on failure. |
| 1051 | */ |
| 1052 | ssize_t aa_replace_profiles(void *udata, size_t size, bool noreplace) |
| 1053 | { |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 1054 | const char *ns_name, *name = NULL, *info = NULL; |
John Johansen | dd51c848 | 2013-07-10 21:05:43 -0700 | [diff] [blame] | 1055 | struct aa_namespace *ns = NULL; |
| 1056 | struct aa_load_ent *ent, *tmp; |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 1057 | int op = OP_PROF_REPL; |
| 1058 | ssize_t error; |
John Johansen | dd51c848 | 2013-07-10 21:05:43 -0700 | [diff] [blame] | 1059 | LIST_HEAD(lh); |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 1060 | |
| 1061 | /* released below */ |
John Johansen | dd51c848 | 2013-07-10 21:05:43 -0700 | [diff] [blame] | 1062 | error = aa_unpack(udata, size, &lh, &ns_name); |
| 1063 | if (error) |
| 1064 | goto out; |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 1065 | |
| 1066 | /* released below */ |
| 1067 | ns = aa_prepare_namespace(ns_name); |
| 1068 | if (!ns) { |
| 1069 | info = "failed to prepare namespace"; |
| 1070 | error = -ENOMEM; |
| 1071 | name = ns_name; |
| 1072 | goto fail; |
| 1073 | } |
| 1074 | |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 1075 | mutex_lock(&ns->lock); |
John Johansen | dd51c848 | 2013-07-10 21:05:43 -0700 | [diff] [blame] | 1076 | /* setup parent and ns info */ |
| 1077 | list_for_each_entry(ent, &lh, list) { |
| 1078 | struct aa_policy *policy; |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 1079 | |
John Johansen | dd51c848 | 2013-07-10 21:05:43 -0700 | [diff] [blame] | 1080 | name = ent->new->base.hname; |
| 1081 | error = __lookup_replace(ns, ent->new->base.hname, noreplace, |
| 1082 | &ent->old, &info); |
| 1083 | if (error) |
| 1084 | goto fail_lock; |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 1085 | |
John Johansen | dd51c848 | 2013-07-10 21:05:43 -0700 | [diff] [blame] | 1086 | if (ent->new->rename) { |
| 1087 | error = __lookup_replace(ns, ent->new->rename, |
| 1088 | noreplace, &ent->rename, |
| 1089 | &info); |
| 1090 | if (error) |
| 1091 | goto fail_lock; |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 1092 | } |
John Johansen | dd51c848 | 2013-07-10 21:05:43 -0700 | [diff] [blame] | 1093 | |
| 1094 | /* released when @new is freed */ |
| 1095 | ent->new->ns = aa_get_namespace(ns); |
| 1096 | |
| 1097 | if (ent->old || ent->rename) |
| 1098 | continue; |
| 1099 | |
| 1100 | /* no ref on policy only use inside lock */ |
| 1101 | policy = __lookup_parent(ns, ent->new->base.hname); |
| 1102 | if (!policy) { |
| 1103 | struct aa_profile *p; |
| 1104 | p = __list_lookup_parent(&lh, ent->new); |
| 1105 | if (!p) { |
| 1106 | error = -ENOENT; |
| 1107 | info = "parent does not exist"; |
| 1108 | name = ent->new->base.hname; |
| 1109 | goto fail_lock; |
| 1110 | } |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 1111 | rcu_assign_pointer(ent->new->parent, aa_get_profile(p)); |
| 1112 | } else if (policy != &ns->base) { |
John Johansen | dd51c848 | 2013-07-10 21:05:43 -0700 | [diff] [blame] | 1113 | /* released on profile replacement or free_profile */ |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 1114 | struct aa_profile *p = (struct aa_profile *) policy; |
| 1115 | rcu_assign_pointer(ent->new->parent, aa_get_profile(p)); |
| 1116 | } |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 1117 | } |
| 1118 | |
John Johansen | dd51c848 | 2013-07-10 21:05:43 -0700 | [diff] [blame] | 1119 | /* do actual replacement */ |
| 1120 | list_for_each_entry_safe(ent, tmp, &lh, list) { |
| 1121 | list_del_init(&ent->list); |
| 1122 | op = (!ent->old && !ent->rename) ? OP_PROF_LOAD : OP_PROF_REPL; |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 1123 | |
John Johansen | dd51c848 | 2013-07-10 21:05:43 -0700 | [diff] [blame] | 1124 | audit_policy(op, GFP_ATOMIC, ent->new->base.name, NULL, error); |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 1125 | |
John Johansen | dd51c848 | 2013-07-10 21:05:43 -0700 | [diff] [blame] | 1126 | if (ent->old) { |
John Johansen | 77b071b | 2013-07-10 21:07:43 -0700 | [diff] [blame] | 1127 | __replace_profile(ent->old, ent->new, 1); |
John Johansen | dd51c848 | 2013-07-10 21:05:43 -0700 | [diff] [blame] | 1128 | if (ent->rename) |
John Johansen | 77b071b | 2013-07-10 21:07:43 -0700 | [diff] [blame] | 1129 | __replace_profile(ent->rename, ent->new, 0); |
John Johansen | dd51c848 | 2013-07-10 21:05:43 -0700 | [diff] [blame] | 1130 | } else if (ent->rename) { |
John Johansen | 77b071b | 2013-07-10 21:07:43 -0700 | [diff] [blame] | 1131 | __replace_profile(ent->rename, ent->new, 0); |
John Johansen | dd51c848 | 2013-07-10 21:05:43 -0700 | [diff] [blame] | 1132 | } else if (ent->new->parent) { |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 1133 | struct aa_profile *parent, *newest; |
| 1134 | parent = rcu_dereference_protected(ent->new->parent, |
| 1135 | mutex_is_locked(&ns->lock)); |
John Johansen | 77b071b | 2013-07-10 21:07:43 -0700 | [diff] [blame] | 1136 | newest = aa_get_newest_profile(parent); |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 1137 | |
John Johansen | dd51c848 | 2013-07-10 21:05:43 -0700 | [diff] [blame] | 1138 | /* parent replaced in this atomic set? */ |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 1139 | if (newest != parent) { |
| 1140 | aa_get_profile(newest); |
| 1141 | aa_put_profile(parent); |
| 1142 | rcu_assign_pointer(ent->new->parent, newest); |
John Johansen | 77b071b | 2013-07-10 21:07:43 -0700 | [diff] [blame] | 1143 | } else |
| 1144 | aa_put_profile(newest); |
John Johansen | dd51c848 | 2013-07-10 21:05:43 -0700 | [diff] [blame] | 1145 | __list_add_profile(&parent->base.profiles, ent->new); |
| 1146 | } else |
| 1147 | __list_add_profile(&ns->base.profiles, ent->new); |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 1148 | |
John Johansen | dd51c848 | 2013-07-10 21:05:43 -0700 | [diff] [blame] | 1149 | aa_load_ent_free(ent); |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 1150 | } |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 1151 | mutex_unlock(&ns->lock); |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 1152 | |
| 1153 | out: |
| 1154 | aa_put_namespace(ns); |
John Johansen | dd51c848 | 2013-07-10 21:05:43 -0700 | [diff] [blame] | 1155 | |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 1156 | if (error) |
| 1157 | return error; |
| 1158 | return size; |
| 1159 | |
John Johansen | dd51c848 | 2013-07-10 21:05:43 -0700 | [diff] [blame] | 1160 | fail_lock: |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 1161 | mutex_unlock(&ns->lock); |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 1162 | fail: |
| 1163 | error = audit_policy(op, GFP_KERNEL, name, info, error); |
John Johansen | dd51c848 | 2013-07-10 21:05:43 -0700 | [diff] [blame] | 1164 | |
| 1165 | list_for_each_entry_safe(ent, tmp, &lh, list) { |
| 1166 | list_del_init(&ent->list); |
| 1167 | aa_load_ent_free(ent); |
| 1168 | } |
| 1169 | |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 1170 | goto out; |
| 1171 | } |
| 1172 | |
| 1173 | /** |
| 1174 | * aa_remove_profiles - remove profile(s) from the system |
| 1175 | * @fqname: name of the profile or namespace to remove (NOT NULL) |
| 1176 | * @size: size of the name |
| 1177 | * |
| 1178 | * Remove a profile or sub namespace from the current namespace, so that |
| 1179 | * they can not be found anymore and mark them as replaced by unconfined |
| 1180 | * |
| 1181 | * NOTE: removing confinement does not restore rlimits to preconfinemnet values |
| 1182 | * |
| 1183 | * Returns: size of data consume else error code if fails |
| 1184 | */ |
| 1185 | ssize_t aa_remove_profiles(char *fqname, size_t size) |
| 1186 | { |
| 1187 | struct aa_namespace *root, *ns = NULL; |
| 1188 | struct aa_profile *profile = NULL; |
| 1189 | const char *name = fqname, *info = NULL; |
| 1190 | ssize_t error = 0; |
| 1191 | |
| 1192 | if (*fqname == 0) { |
| 1193 | info = "no profile specified"; |
| 1194 | error = -ENOENT; |
| 1195 | goto fail; |
| 1196 | } |
| 1197 | |
| 1198 | root = aa_current_profile()->ns; |
| 1199 | |
| 1200 | if (fqname[0] == ':') { |
| 1201 | char *ns_name; |
| 1202 | name = aa_split_fqname(fqname, &ns_name); |
John Johansen | 41d1b3e | 2013-02-21 01:14:17 -0800 | [diff] [blame] | 1203 | /* released below */ |
| 1204 | ns = aa_find_namespace(root, ns_name); |
| 1205 | if (!ns) { |
| 1206 | info = "namespace does not exist"; |
| 1207 | error = -ENOENT; |
| 1208 | goto fail; |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 1209 | } |
| 1210 | } else |
| 1211 | /* released below */ |
| 1212 | ns = aa_get_namespace(root); |
| 1213 | |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 1214 | if (!name) { |
| 1215 | /* remove namespace - can only happen if fqname[0] == ':' */ |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 1216 | mutex_lock(&ns->parent->lock); |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 1217 | __remove_namespace(ns); |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 1218 | mutex_unlock(&ns->parent->lock); |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 1219 | } else { |
| 1220 | /* remove profile */ |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 1221 | mutex_lock(&ns->lock); |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 1222 | profile = aa_get_profile(__lookup_profile(&ns->base, name)); |
| 1223 | if (!profile) { |
| 1224 | error = -ENOENT; |
| 1225 | info = "profile does not exist"; |
| 1226 | goto fail_ns_lock; |
| 1227 | } |
| 1228 | name = profile->base.hname; |
| 1229 | __remove_profile(profile); |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 1230 | mutex_unlock(&ns->lock); |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 1231 | } |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 1232 | |
| 1233 | /* don't fail removal if audit fails */ |
| 1234 | (void) audit_policy(OP_PROF_RM, GFP_KERNEL, name, info, error); |
| 1235 | aa_put_namespace(ns); |
| 1236 | aa_put_profile(profile); |
| 1237 | return size; |
| 1238 | |
| 1239 | fail_ns_lock: |
John Johansen | 01e2b67 | 2013-07-10 21:06:43 -0700 | [diff] [blame] | 1240 | mutex_unlock(&ns->lock); |
John Johansen | c88d4c7 | 2010-07-29 14:48:00 -0700 | [diff] [blame] | 1241 | aa_put_namespace(ns); |
| 1242 | |
| 1243 | fail: |
| 1244 | (void) audit_policy(OP_PROF_RM, GFP_KERNEL, name, info, error); |
| 1245 | return error; |
| 1246 | } |