Emeric Vigier | 2f62582 | 2012-08-06 11:09:52 -0400 | [diff] [blame] | 1 | /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */ |
| 2 | /* policy.c Bus security policy |
| 3 | * |
| 4 | * Copyright (C) 2003, 2004 Red Hat, Inc. |
| 5 | * |
| 6 | * Licensed under the Academic Free License version 2.1 |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 21 | * |
| 22 | */ |
| 23 | |
| 24 | #include <config.h> |
| 25 | #include "policy.h" |
| 26 | #include "services.h" |
| 27 | #include "test.h" |
| 28 | #include "utils.h" |
| 29 | #include <dbus/dbus-list.h> |
| 30 | #include <dbus/dbus-hash.h> |
| 31 | #include <dbus/dbus-internals.h> |
| 32 | |
| 33 | BusPolicyRule* |
| 34 | bus_policy_rule_new (BusPolicyRuleType type, |
| 35 | dbus_bool_t allow) |
| 36 | { |
| 37 | BusPolicyRule *rule; |
| 38 | |
| 39 | rule = dbus_new0 (BusPolicyRule, 1); |
| 40 | if (rule == NULL) |
| 41 | return NULL; |
| 42 | |
| 43 | rule->type = type; |
| 44 | rule->refcount = 1; |
| 45 | rule->allow = allow; |
| 46 | |
| 47 | switch (rule->type) |
| 48 | { |
| 49 | case BUS_POLICY_RULE_USER: |
| 50 | rule->d.user.uid = DBUS_UID_UNSET; |
| 51 | break; |
| 52 | case BUS_POLICY_RULE_GROUP: |
| 53 | rule->d.group.gid = DBUS_GID_UNSET; |
| 54 | break; |
| 55 | case BUS_POLICY_RULE_SEND: |
| 56 | rule->d.send.message_type = DBUS_MESSAGE_TYPE_INVALID; |
| 57 | |
| 58 | /* allow rules default to TRUE (only requested replies allowed) |
| 59 | * deny rules default to FALSE (only unrequested replies denied) |
| 60 | */ |
| 61 | rule->d.send.requested_reply = rule->allow; |
| 62 | break; |
| 63 | case BUS_POLICY_RULE_RECEIVE: |
| 64 | rule->d.receive.message_type = DBUS_MESSAGE_TYPE_INVALID; |
| 65 | /* allow rules default to TRUE (only requested replies allowed) |
| 66 | * deny rules default to FALSE (only unrequested replies denied) |
| 67 | */ |
| 68 | rule->d.receive.requested_reply = rule->allow; |
| 69 | break; |
| 70 | case BUS_POLICY_RULE_OWN: |
| 71 | break; |
| 72 | } |
| 73 | |
| 74 | return rule; |
| 75 | } |
| 76 | |
| 77 | BusPolicyRule * |
| 78 | bus_policy_rule_ref (BusPolicyRule *rule) |
| 79 | { |
| 80 | _dbus_assert (rule->refcount > 0); |
| 81 | |
| 82 | rule->refcount += 1; |
| 83 | |
| 84 | return rule; |
| 85 | } |
| 86 | |
| 87 | void |
| 88 | bus_policy_rule_unref (BusPolicyRule *rule) |
| 89 | { |
| 90 | _dbus_assert (rule->refcount > 0); |
| 91 | |
| 92 | rule->refcount -= 1; |
| 93 | |
| 94 | if (rule->refcount == 0) |
| 95 | { |
| 96 | switch (rule->type) |
| 97 | { |
| 98 | case BUS_POLICY_RULE_SEND: |
| 99 | dbus_free (rule->d.send.path); |
| 100 | dbus_free (rule->d.send.interface); |
| 101 | dbus_free (rule->d.send.member); |
| 102 | dbus_free (rule->d.send.error); |
| 103 | dbus_free (rule->d.send.destination); |
| 104 | break; |
| 105 | case BUS_POLICY_RULE_RECEIVE: |
| 106 | dbus_free (rule->d.receive.path); |
| 107 | dbus_free (rule->d.receive.interface); |
| 108 | dbus_free (rule->d.receive.member); |
| 109 | dbus_free (rule->d.receive.error); |
| 110 | dbus_free (rule->d.receive.origin); |
| 111 | break; |
| 112 | case BUS_POLICY_RULE_OWN: |
| 113 | dbus_free (rule->d.own.service_name); |
| 114 | break; |
| 115 | case BUS_POLICY_RULE_USER: |
| 116 | break; |
| 117 | case BUS_POLICY_RULE_GROUP: |
| 118 | break; |
| 119 | } |
| 120 | |
| 121 | dbus_free (rule); |
| 122 | } |
| 123 | } |
| 124 | |
| 125 | struct BusPolicy |
| 126 | { |
| 127 | int refcount; |
| 128 | |
| 129 | DBusList *default_rules; /**< Default policy rules */ |
| 130 | DBusList *mandatory_rules; /**< Mandatory policy rules */ |
| 131 | DBusHashTable *rules_by_uid; /**< per-UID policy rules */ |
| 132 | DBusHashTable *rules_by_gid; /**< per-GID policy rules */ |
| 133 | DBusList *at_console_true_rules; /**< console user policy rules where at_console="true"*/ |
| 134 | DBusList *at_console_false_rules; /**< console user policy rules where at_console="false"*/ |
| 135 | }; |
| 136 | |
| 137 | static void |
| 138 | free_rule_func (void *data, |
| 139 | void *user_data) |
| 140 | { |
| 141 | BusPolicyRule *rule = data; |
| 142 | |
| 143 | bus_policy_rule_unref (rule); |
| 144 | } |
| 145 | |
| 146 | static void |
| 147 | free_rule_list_func (void *data) |
| 148 | { |
| 149 | DBusList **list = data; |
| 150 | |
| 151 | if (list == NULL) /* DBusHashTable is on crack */ |
| 152 | return; |
| 153 | |
| 154 | _dbus_list_foreach (list, free_rule_func, NULL); |
| 155 | |
| 156 | _dbus_list_clear (list); |
| 157 | |
| 158 | dbus_free (list); |
| 159 | } |
| 160 | |
| 161 | BusPolicy* |
| 162 | bus_policy_new (void) |
| 163 | { |
| 164 | BusPolicy *policy; |
| 165 | |
| 166 | policy = dbus_new0 (BusPolicy, 1); |
| 167 | if (policy == NULL) |
| 168 | return NULL; |
| 169 | |
| 170 | policy->refcount = 1; |
| 171 | |
| 172 | policy->rules_by_uid = _dbus_hash_table_new (DBUS_HASH_UINTPTR, |
| 173 | NULL, |
| 174 | free_rule_list_func); |
| 175 | if (policy->rules_by_uid == NULL) |
| 176 | goto failed; |
| 177 | |
| 178 | policy->rules_by_gid = _dbus_hash_table_new (DBUS_HASH_UINTPTR, |
| 179 | NULL, |
| 180 | free_rule_list_func); |
| 181 | if (policy->rules_by_gid == NULL) |
| 182 | goto failed; |
| 183 | |
| 184 | return policy; |
| 185 | |
| 186 | failed: |
| 187 | bus_policy_unref (policy); |
| 188 | return NULL; |
| 189 | } |
| 190 | |
| 191 | BusPolicy * |
| 192 | bus_policy_ref (BusPolicy *policy) |
| 193 | { |
| 194 | _dbus_assert (policy->refcount > 0); |
| 195 | |
| 196 | policy->refcount += 1; |
| 197 | |
| 198 | return policy; |
| 199 | } |
| 200 | |
| 201 | void |
| 202 | bus_policy_unref (BusPolicy *policy) |
| 203 | { |
| 204 | _dbus_assert (policy->refcount > 0); |
| 205 | |
| 206 | policy->refcount -= 1; |
| 207 | |
| 208 | if (policy->refcount == 0) |
| 209 | { |
| 210 | _dbus_list_foreach (&policy->default_rules, free_rule_func, NULL); |
| 211 | _dbus_list_clear (&policy->default_rules); |
| 212 | |
| 213 | _dbus_list_foreach (&policy->mandatory_rules, free_rule_func, NULL); |
| 214 | _dbus_list_clear (&policy->mandatory_rules); |
| 215 | |
| 216 | _dbus_list_foreach (&policy->at_console_true_rules, free_rule_func, NULL); |
| 217 | _dbus_list_clear (&policy->at_console_true_rules); |
| 218 | |
| 219 | _dbus_list_foreach (&policy->at_console_false_rules, free_rule_func, NULL); |
| 220 | _dbus_list_clear (&policy->at_console_false_rules); |
| 221 | |
| 222 | if (policy->rules_by_uid) |
| 223 | { |
| 224 | _dbus_hash_table_unref (policy->rules_by_uid); |
| 225 | policy->rules_by_uid = NULL; |
| 226 | } |
| 227 | |
| 228 | if (policy->rules_by_gid) |
| 229 | { |
| 230 | _dbus_hash_table_unref (policy->rules_by_gid); |
| 231 | policy->rules_by_gid = NULL; |
| 232 | } |
| 233 | |
| 234 | dbus_free (policy); |
| 235 | } |
| 236 | } |
| 237 | |
| 238 | static dbus_bool_t |
| 239 | add_list_to_client (DBusList **list, |
| 240 | BusClientPolicy *client) |
| 241 | { |
| 242 | DBusList *link; |
| 243 | |
| 244 | link = _dbus_list_get_first_link (list); |
| 245 | while (link != NULL) |
| 246 | { |
| 247 | BusPolicyRule *rule = link->data; |
| 248 | link = _dbus_list_get_next_link (list, link); |
| 249 | |
| 250 | switch (rule->type) |
| 251 | { |
| 252 | case BUS_POLICY_RULE_USER: |
| 253 | case BUS_POLICY_RULE_GROUP: |
| 254 | /* These aren't per-connection policies */ |
| 255 | break; |
| 256 | |
| 257 | case BUS_POLICY_RULE_OWN: |
| 258 | case BUS_POLICY_RULE_SEND: |
| 259 | case BUS_POLICY_RULE_RECEIVE: |
| 260 | /* These are per-connection */ |
| 261 | if (!bus_client_policy_append_rule (client, rule)) |
| 262 | return FALSE; |
| 263 | break; |
| 264 | } |
| 265 | } |
| 266 | |
| 267 | return TRUE; |
| 268 | } |
| 269 | |
| 270 | BusClientPolicy* |
| 271 | bus_policy_create_client_policy (BusPolicy *policy, |
| 272 | DBusConnection *connection, |
| 273 | DBusError *error) |
| 274 | { |
| 275 | BusClientPolicy *client; |
| 276 | dbus_uid_t uid; |
| 277 | dbus_bool_t at_console; |
| 278 | |
| 279 | _dbus_assert (dbus_connection_get_is_authenticated (connection)); |
| 280 | _DBUS_ASSERT_ERROR_IS_CLEAR (error); |
| 281 | |
| 282 | client = bus_client_policy_new (); |
| 283 | if (client == NULL) |
| 284 | goto nomem; |
| 285 | |
| 286 | if (!add_list_to_client (&policy->default_rules, |
| 287 | client)) |
| 288 | goto nomem; |
| 289 | |
| 290 | /* we avoid the overhead of looking up user's groups |
| 291 | * if we don't have any group rules anyway |
| 292 | */ |
| 293 | if (_dbus_hash_table_get_n_entries (policy->rules_by_gid) > 0) |
| 294 | { |
| 295 | unsigned long *groups; |
| 296 | int n_groups; |
| 297 | int i; |
| 298 | |
| 299 | if (!bus_connection_get_unix_groups (connection, &groups, &n_groups, error)) |
| 300 | goto failed; |
| 301 | |
| 302 | i = 0; |
| 303 | while (i < n_groups) |
| 304 | { |
| 305 | DBusList **list; |
| 306 | |
| 307 | list = _dbus_hash_table_lookup_uintptr (policy->rules_by_gid, |
| 308 | groups[i]); |
| 309 | |
| 310 | if (list != NULL) |
| 311 | { |
| 312 | if (!add_list_to_client (list, client)) |
| 313 | { |
| 314 | dbus_free (groups); |
| 315 | goto nomem; |
| 316 | } |
| 317 | } |
| 318 | |
| 319 | ++i; |
| 320 | } |
| 321 | |
| 322 | dbus_free (groups); |
| 323 | } |
| 324 | |
| 325 | if (dbus_connection_get_unix_user (connection, &uid)) |
| 326 | { |
| 327 | if (_dbus_hash_table_get_n_entries (policy->rules_by_uid) > 0) |
| 328 | { |
| 329 | DBusList **list; |
| 330 | |
| 331 | list = _dbus_hash_table_lookup_uintptr (policy->rules_by_uid, |
| 332 | uid); |
| 333 | |
| 334 | if (list != NULL) |
| 335 | { |
| 336 | if (!add_list_to_client (list, client)) |
| 337 | goto nomem; |
| 338 | } |
| 339 | } |
| 340 | |
| 341 | /* Add console rules */ |
| 342 | at_console = _dbus_unix_user_is_at_console (uid, error); |
| 343 | |
| 344 | if (at_console) |
| 345 | { |
| 346 | if (!add_list_to_client (&policy->at_console_true_rules, client)) |
| 347 | goto nomem; |
| 348 | } |
| 349 | else if (dbus_error_is_set (error) == TRUE) |
| 350 | { |
| 351 | goto failed; |
| 352 | } |
| 353 | else if (!add_list_to_client (&policy->at_console_false_rules, client)) |
| 354 | { |
| 355 | goto nomem; |
| 356 | } |
| 357 | } |
| 358 | |
| 359 | if (!add_list_to_client (&policy->mandatory_rules, |
| 360 | client)) |
| 361 | goto nomem; |
| 362 | |
| 363 | bus_client_policy_optimize (client); |
| 364 | |
| 365 | return client; |
| 366 | |
| 367 | nomem: |
| 368 | BUS_SET_OOM (error); |
| 369 | failed: |
| 370 | _DBUS_ASSERT_ERROR_IS_SET (error); |
| 371 | if (client) |
| 372 | bus_client_policy_unref (client); |
| 373 | return NULL; |
| 374 | } |
| 375 | |
| 376 | static dbus_bool_t |
| 377 | list_allows_user (dbus_bool_t def, |
| 378 | DBusList **list, |
| 379 | unsigned long uid, |
| 380 | const unsigned long *group_ids, |
| 381 | int n_group_ids) |
| 382 | { |
| 383 | DBusList *link; |
| 384 | dbus_bool_t allowed; |
| 385 | |
| 386 | allowed = def; |
| 387 | |
| 388 | link = _dbus_list_get_first_link (list); |
| 389 | while (link != NULL) |
| 390 | { |
| 391 | BusPolicyRule *rule = link->data; |
| 392 | link = _dbus_list_get_next_link (list, link); |
| 393 | |
| 394 | if (rule->type == BUS_POLICY_RULE_USER) |
| 395 | { |
| 396 | _dbus_verbose ("List %p user rule uid="DBUS_UID_FORMAT"\n", |
| 397 | list, rule->d.user.uid); |
| 398 | |
| 399 | if (rule->d.user.uid == DBUS_UID_UNSET) |
| 400 | ; /* '*' wildcard */ |
| 401 | else if (rule->d.user.uid != uid) |
| 402 | continue; |
| 403 | } |
| 404 | else if (rule->type == BUS_POLICY_RULE_GROUP) |
| 405 | { |
| 406 | _dbus_verbose ("List %p group rule uid="DBUS_UID_FORMAT"\n", |
| 407 | list, rule->d.user.uid); |
| 408 | |
| 409 | if (rule->d.group.gid == DBUS_GID_UNSET) |
| 410 | ; /* '*' wildcard */ |
| 411 | else |
| 412 | { |
| 413 | int i; |
| 414 | |
| 415 | i = 0; |
| 416 | while (i < n_group_ids) |
| 417 | { |
| 418 | if (rule->d.group.gid == group_ids[i]) |
| 419 | break; |
| 420 | ++i; |
| 421 | } |
| 422 | |
| 423 | if (i == n_group_ids) |
| 424 | continue; |
| 425 | } |
| 426 | } |
| 427 | else |
| 428 | continue; |
| 429 | |
| 430 | allowed = rule->allow; |
| 431 | } |
| 432 | |
| 433 | return allowed; |
| 434 | } |
| 435 | |
| 436 | dbus_bool_t |
| 437 | bus_policy_allow_unix_user (BusPolicy *policy, |
| 438 | unsigned long uid) |
| 439 | { |
| 440 | dbus_bool_t allowed; |
| 441 | unsigned long *group_ids; |
| 442 | int n_group_ids; |
| 443 | |
| 444 | /* On OOM or error we always reject the user */ |
| 445 | if (!_dbus_unix_groups_from_uid (uid, &group_ids, &n_group_ids)) |
| 446 | { |
| 447 | _dbus_verbose ("Did not get any groups for UID %lu\n", |
| 448 | uid); |
| 449 | return FALSE; |
| 450 | } |
| 451 | |
| 452 | /* Default to "user owning bus" can connect */ |
| 453 | allowed = _dbus_unix_user_is_process_owner (uid); |
| 454 | |
| 455 | allowed = list_allows_user (allowed, |
| 456 | &policy->default_rules, |
| 457 | uid, |
| 458 | group_ids, n_group_ids); |
| 459 | |
| 460 | allowed = list_allows_user (allowed, |
| 461 | &policy->mandatory_rules, |
| 462 | uid, |
| 463 | group_ids, n_group_ids); |
| 464 | |
| 465 | dbus_free (group_ids); |
| 466 | |
| 467 | _dbus_verbose ("UID %lu allowed = %d\n", uid, allowed); |
| 468 | |
| 469 | return allowed; |
| 470 | } |
| 471 | |
| 472 | /* For now this is never actually called because the default |
| 473 | * DBusConnection behavior of 'same user that owns the bus can |
| 474 | * connect' is all it would do. Set the windows user function in |
| 475 | * connection.c if the config file ever supports doing something |
| 476 | * interesting here. |
| 477 | */ |
| 478 | dbus_bool_t |
| 479 | bus_policy_allow_windows_user (BusPolicy *policy, |
| 480 | const char *windows_sid) |
| 481 | { |
| 482 | /* Windows has no policies here since only the session bus |
| 483 | * is really used for now, so just checking that the |
| 484 | * connecting person is the same as the bus owner is fine. |
| 485 | */ |
| 486 | return _dbus_windows_user_is_process_owner (windows_sid); |
| 487 | } |
| 488 | |
| 489 | dbus_bool_t |
| 490 | bus_policy_append_default_rule (BusPolicy *policy, |
| 491 | BusPolicyRule *rule) |
| 492 | { |
| 493 | if (!_dbus_list_append (&policy->default_rules, rule)) |
| 494 | return FALSE; |
| 495 | |
| 496 | bus_policy_rule_ref (rule); |
| 497 | |
| 498 | return TRUE; |
| 499 | } |
| 500 | |
| 501 | dbus_bool_t |
| 502 | bus_policy_append_mandatory_rule (BusPolicy *policy, |
| 503 | BusPolicyRule *rule) |
| 504 | { |
| 505 | if (!_dbus_list_append (&policy->mandatory_rules, rule)) |
| 506 | return FALSE; |
| 507 | |
| 508 | bus_policy_rule_ref (rule); |
| 509 | |
| 510 | return TRUE; |
| 511 | } |
| 512 | |
| 513 | |
| 514 | |
| 515 | static DBusList** |
| 516 | get_list (DBusHashTable *hash, |
| 517 | unsigned long key) |
| 518 | { |
| 519 | DBusList **list; |
| 520 | |
| 521 | list = _dbus_hash_table_lookup_uintptr (hash, key); |
| 522 | |
| 523 | if (list == NULL) |
| 524 | { |
| 525 | list = dbus_new0 (DBusList*, 1); |
| 526 | if (list == NULL) |
| 527 | return NULL; |
| 528 | |
| 529 | if (!_dbus_hash_table_insert_uintptr (hash, key, list)) |
| 530 | { |
| 531 | dbus_free (list); |
| 532 | return NULL; |
| 533 | } |
| 534 | } |
| 535 | |
| 536 | return list; |
| 537 | } |
| 538 | |
| 539 | dbus_bool_t |
| 540 | bus_policy_append_user_rule (BusPolicy *policy, |
| 541 | dbus_uid_t uid, |
| 542 | BusPolicyRule *rule) |
| 543 | { |
| 544 | DBusList **list; |
| 545 | |
| 546 | list = get_list (policy->rules_by_uid, uid); |
| 547 | |
| 548 | if (list == NULL) |
| 549 | return FALSE; |
| 550 | |
| 551 | if (!_dbus_list_append (list, rule)) |
| 552 | return FALSE; |
| 553 | |
| 554 | bus_policy_rule_ref (rule); |
| 555 | |
| 556 | return TRUE; |
| 557 | } |
| 558 | |
| 559 | dbus_bool_t |
| 560 | bus_policy_append_group_rule (BusPolicy *policy, |
| 561 | dbus_gid_t gid, |
| 562 | BusPolicyRule *rule) |
| 563 | { |
| 564 | DBusList **list; |
| 565 | |
| 566 | list = get_list (policy->rules_by_gid, gid); |
| 567 | |
| 568 | if (list == NULL) |
| 569 | return FALSE; |
| 570 | |
| 571 | if (!_dbus_list_append (list, rule)) |
| 572 | return FALSE; |
| 573 | |
| 574 | bus_policy_rule_ref (rule); |
| 575 | |
| 576 | return TRUE; |
| 577 | } |
| 578 | |
| 579 | dbus_bool_t |
| 580 | bus_policy_append_console_rule (BusPolicy *policy, |
| 581 | dbus_bool_t at_console, |
| 582 | BusPolicyRule *rule) |
| 583 | { |
| 584 | if (at_console) |
| 585 | { |
| 586 | if (!_dbus_list_append (&policy->at_console_true_rules, rule)) |
| 587 | return FALSE; |
| 588 | } |
| 589 | else |
| 590 | { |
| 591 | if (!_dbus_list_append (&policy->at_console_false_rules, rule)) |
| 592 | return FALSE; |
| 593 | } |
| 594 | |
| 595 | bus_policy_rule_ref (rule); |
| 596 | |
| 597 | return TRUE; |
| 598 | |
| 599 | } |
| 600 | |
| 601 | static dbus_bool_t |
| 602 | append_copy_of_policy_list (DBusList **list, |
| 603 | DBusList **to_append) |
| 604 | { |
| 605 | DBusList *link; |
| 606 | DBusList *tmp_list; |
| 607 | |
| 608 | tmp_list = NULL; |
| 609 | |
| 610 | /* Preallocate all our links */ |
| 611 | link = _dbus_list_get_first_link (to_append); |
| 612 | while (link != NULL) |
| 613 | { |
| 614 | if (!_dbus_list_append (&tmp_list, link->data)) |
| 615 | { |
| 616 | _dbus_list_clear (&tmp_list); |
| 617 | return FALSE; |
| 618 | } |
| 619 | |
| 620 | link = _dbus_list_get_next_link (to_append, link); |
| 621 | } |
| 622 | |
| 623 | /* Now append them */ |
| 624 | while ((link = _dbus_list_pop_first_link (&tmp_list))) |
| 625 | { |
| 626 | bus_policy_rule_ref (link->data); |
| 627 | _dbus_list_append_link (list, link); |
| 628 | } |
| 629 | |
| 630 | return TRUE; |
| 631 | } |
| 632 | |
| 633 | static dbus_bool_t |
| 634 | merge_id_hash (DBusHashTable *dest, |
| 635 | DBusHashTable *to_absorb) |
| 636 | { |
| 637 | DBusHashIter iter; |
| 638 | |
| 639 | _dbus_hash_iter_init (to_absorb, &iter); |
| 640 | while (_dbus_hash_iter_next (&iter)) |
| 641 | { |
| 642 | unsigned long id = _dbus_hash_iter_get_uintptr_key (&iter); |
| 643 | DBusList **list = _dbus_hash_iter_get_value (&iter); |
| 644 | DBusList **target = get_list (dest, id); |
| 645 | |
| 646 | if (target == NULL) |
| 647 | return FALSE; |
| 648 | |
| 649 | if (!append_copy_of_policy_list (target, list)) |
| 650 | return FALSE; |
| 651 | } |
| 652 | |
| 653 | return TRUE; |
| 654 | } |
| 655 | |
| 656 | dbus_bool_t |
| 657 | bus_policy_merge (BusPolicy *policy, |
| 658 | BusPolicy *to_absorb) |
| 659 | { |
| 660 | /* FIXME Not properly atomic, but as used for configuration files we |
| 661 | * don't rely on it quite so much. |
| 662 | */ |
| 663 | |
| 664 | if (!append_copy_of_policy_list (&policy->default_rules, |
| 665 | &to_absorb->default_rules)) |
| 666 | return FALSE; |
| 667 | |
| 668 | if (!append_copy_of_policy_list (&policy->mandatory_rules, |
| 669 | &to_absorb->mandatory_rules)) |
| 670 | return FALSE; |
| 671 | |
| 672 | if (!append_copy_of_policy_list (&policy->at_console_true_rules, |
| 673 | &to_absorb->at_console_true_rules)) |
| 674 | return FALSE; |
| 675 | |
| 676 | if (!append_copy_of_policy_list (&policy->at_console_false_rules, |
| 677 | &to_absorb->at_console_false_rules)) |
| 678 | return FALSE; |
| 679 | |
| 680 | if (!merge_id_hash (policy->rules_by_uid, |
| 681 | to_absorb->rules_by_uid)) |
| 682 | return FALSE; |
| 683 | |
| 684 | if (!merge_id_hash (policy->rules_by_gid, |
| 685 | to_absorb->rules_by_gid)) |
| 686 | return FALSE; |
| 687 | |
| 688 | return TRUE; |
| 689 | } |
| 690 | |
| 691 | struct BusClientPolicy |
| 692 | { |
| 693 | int refcount; |
| 694 | |
| 695 | DBusList *rules; |
| 696 | }; |
| 697 | |
| 698 | BusClientPolicy* |
| 699 | bus_client_policy_new (void) |
| 700 | { |
| 701 | BusClientPolicy *policy; |
| 702 | |
| 703 | policy = dbus_new0 (BusClientPolicy, 1); |
| 704 | if (policy == NULL) |
| 705 | return NULL; |
| 706 | |
| 707 | policy->refcount = 1; |
| 708 | |
| 709 | return policy; |
| 710 | } |
| 711 | |
| 712 | BusClientPolicy * |
| 713 | bus_client_policy_ref (BusClientPolicy *policy) |
| 714 | { |
| 715 | _dbus_assert (policy->refcount > 0); |
| 716 | |
| 717 | policy->refcount += 1; |
| 718 | |
| 719 | return policy; |
| 720 | } |
| 721 | |
| 722 | static void |
| 723 | rule_unref_foreach (void *data, |
| 724 | void *user_data) |
| 725 | { |
| 726 | BusPolicyRule *rule = data; |
| 727 | |
| 728 | bus_policy_rule_unref (rule); |
| 729 | } |
| 730 | |
| 731 | void |
| 732 | bus_client_policy_unref (BusClientPolicy *policy) |
| 733 | { |
| 734 | _dbus_assert (policy->refcount > 0); |
| 735 | |
| 736 | policy->refcount -= 1; |
| 737 | |
| 738 | if (policy->refcount == 0) |
| 739 | { |
| 740 | _dbus_list_foreach (&policy->rules, |
| 741 | rule_unref_foreach, |
| 742 | NULL); |
| 743 | |
| 744 | _dbus_list_clear (&policy->rules); |
| 745 | |
| 746 | dbus_free (policy); |
| 747 | } |
| 748 | } |
| 749 | |
| 750 | static void |
| 751 | remove_rules_by_type_up_to (BusClientPolicy *policy, |
| 752 | BusPolicyRuleType type, |
| 753 | DBusList *up_to) |
| 754 | { |
| 755 | DBusList *link; |
| 756 | |
| 757 | link = _dbus_list_get_first_link (&policy->rules); |
| 758 | while (link != up_to) |
| 759 | { |
| 760 | BusPolicyRule *rule = link->data; |
| 761 | DBusList *next = _dbus_list_get_next_link (&policy->rules, link); |
| 762 | |
| 763 | if (rule->type == type) |
| 764 | { |
| 765 | _dbus_list_remove_link (&policy->rules, link); |
| 766 | bus_policy_rule_unref (rule); |
| 767 | } |
| 768 | |
| 769 | link = next; |
| 770 | } |
| 771 | } |
| 772 | |
| 773 | void |
| 774 | bus_client_policy_optimize (BusClientPolicy *policy) |
| 775 | { |
| 776 | DBusList *link; |
| 777 | |
| 778 | /* The idea here is that if we have: |
| 779 | * |
| 780 | * <allow send_interface="foo.bar"/> |
| 781 | * <deny send_interface="*"/> |
| 782 | * |
| 783 | * (for example) the deny will always override the allow. So we |
| 784 | * delete the allow. Ditto for deny followed by allow, etc. This is |
| 785 | * a dumb thing to put in a config file, but the <include> feature |
| 786 | * of files allows for an "inheritance and override" pattern where |
| 787 | * it could make sense. If an included file wants to "start over" |
| 788 | * with a blanket deny, no point keeping the rules from the parent |
| 789 | * file. |
| 790 | */ |
| 791 | |
| 792 | _dbus_verbose ("Optimizing policy with %d rules\n", |
| 793 | _dbus_list_get_length (&policy->rules)); |
| 794 | |
| 795 | link = _dbus_list_get_first_link (&policy->rules); |
| 796 | while (link != NULL) |
| 797 | { |
| 798 | BusPolicyRule *rule; |
| 799 | DBusList *next; |
| 800 | dbus_bool_t remove_preceding; |
| 801 | |
| 802 | next = _dbus_list_get_next_link (&policy->rules, link); |
| 803 | rule = link->data; |
| 804 | |
| 805 | remove_preceding = FALSE; |
| 806 | |
| 807 | _dbus_assert (rule != NULL); |
| 808 | |
| 809 | switch (rule->type) |
| 810 | { |
| 811 | case BUS_POLICY_RULE_SEND: |
| 812 | remove_preceding = |
| 813 | rule->d.send.message_type == DBUS_MESSAGE_TYPE_INVALID && |
| 814 | rule->d.send.path == NULL && |
| 815 | rule->d.send.interface == NULL && |
| 816 | rule->d.send.member == NULL && |
| 817 | rule->d.send.error == NULL && |
| 818 | rule->d.send.destination == NULL; |
| 819 | break; |
| 820 | case BUS_POLICY_RULE_RECEIVE: |
| 821 | remove_preceding = |
| 822 | rule->d.receive.message_type == DBUS_MESSAGE_TYPE_INVALID && |
| 823 | rule->d.receive.path == NULL && |
| 824 | rule->d.receive.interface == NULL && |
| 825 | rule->d.receive.member == NULL && |
| 826 | rule->d.receive.error == NULL && |
| 827 | rule->d.receive.origin == NULL; |
| 828 | break; |
| 829 | case BUS_POLICY_RULE_OWN: |
| 830 | remove_preceding = |
| 831 | rule->d.own.service_name == NULL; |
| 832 | break; |
| 833 | case BUS_POLICY_RULE_USER: |
| 834 | case BUS_POLICY_RULE_GROUP: |
| 835 | _dbus_assert_not_reached ("invalid rule"); |
| 836 | break; |
| 837 | } |
| 838 | |
| 839 | if (remove_preceding) |
| 840 | remove_rules_by_type_up_to (policy, rule->type, |
| 841 | link); |
| 842 | |
| 843 | link = next; |
| 844 | } |
| 845 | |
| 846 | _dbus_verbose ("After optimization, policy has %d rules\n", |
| 847 | _dbus_list_get_length (&policy->rules)); |
| 848 | } |
| 849 | |
| 850 | dbus_bool_t |
| 851 | bus_client_policy_append_rule (BusClientPolicy *policy, |
| 852 | BusPolicyRule *rule) |
| 853 | { |
| 854 | _dbus_verbose ("Appending rule %p with type %d to policy %p\n", |
| 855 | rule, rule->type, policy); |
| 856 | |
| 857 | if (!_dbus_list_append (&policy->rules, rule)) |
| 858 | return FALSE; |
| 859 | |
| 860 | bus_policy_rule_ref (rule); |
| 861 | |
| 862 | return TRUE; |
| 863 | } |
| 864 | |
| 865 | dbus_bool_t |
| 866 | bus_client_policy_check_can_send (BusClientPolicy *policy, |
| 867 | BusRegistry *registry, |
| 868 | dbus_bool_t requested_reply, |
| 869 | DBusConnection *receiver, |
| 870 | DBusMessage *message, |
| 871 | dbus_int32_t *toggles, |
| 872 | dbus_bool_t *log) |
| 873 | { |
| 874 | DBusList *link; |
| 875 | dbus_bool_t allowed; |
| 876 | |
| 877 | /* policy->rules is in the order the rules appeared |
| 878 | * in the config file, i.e. last rule that applies wins |
| 879 | */ |
| 880 | |
| 881 | _dbus_verbose (" (policy) checking send rules\n"); |
| 882 | *toggles = 0; |
| 883 | |
| 884 | allowed = FALSE; |
| 885 | link = _dbus_list_get_first_link (&policy->rules); |
| 886 | while (link != NULL) |
| 887 | { |
| 888 | BusPolicyRule *rule = link->data; |
| 889 | |
| 890 | link = _dbus_list_get_next_link (&policy->rules, link); |
| 891 | |
| 892 | /* Rule is skipped if it specifies a different |
| 893 | * message name from the message, or a different |
| 894 | * destination from the message |
| 895 | */ |
| 896 | |
| 897 | if (rule->type != BUS_POLICY_RULE_SEND) |
| 898 | { |
| 899 | _dbus_verbose (" (policy) skipping non-send rule\n"); |
| 900 | continue; |
| 901 | } |
| 902 | |
| 903 | if (rule->d.send.message_type != DBUS_MESSAGE_TYPE_INVALID) |
| 904 | { |
| 905 | if (dbus_message_get_type (message) != rule->d.send.message_type) |
| 906 | { |
| 907 | _dbus_verbose (" (policy) skipping rule for different message type\n"); |
| 908 | continue; |
| 909 | } |
| 910 | } |
| 911 | |
| 912 | /* If it's a reply, the requested_reply flag kicks in */ |
| 913 | if (dbus_message_get_reply_serial (message) != 0) |
| 914 | { |
| 915 | /* for allow, requested_reply=true means the rule applies |
| 916 | * only when reply was requested. requested_reply=false means |
| 917 | * always allow. |
| 918 | */ |
| 919 | if (!requested_reply && rule->allow && rule->d.send.requested_reply && !rule->d.send.eavesdrop) |
| 920 | { |
| 921 | _dbus_verbose (" (policy) skipping allow rule since it only applies to requested replies and does not allow eavesdropping\n"); |
| 922 | continue; |
| 923 | } |
| 924 | |
| 925 | /* for deny, requested_reply=false means the rule applies only |
| 926 | * when the reply was not requested. requested_reply=true means the |
| 927 | * rule always applies. |
| 928 | */ |
| 929 | if (requested_reply && !rule->allow && !rule->d.send.requested_reply) |
| 930 | { |
| 931 | _dbus_verbose (" (policy) skipping deny rule since it only applies to unrequested replies\n"); |
| 932 | continue; |
| 933 | } |
| 934 | } |
| 935 | |
| 936 | if (rule->d.send.path != NULL) |
| 937 | { |
| 938 | if (dbus_message_get_path (message) != NULL && |
| 939 | strcmp (dbus_message_get_path (message), |
| 940 | rule->d.send.path) != 0) |
| 941 | { |
| 942 | _dbus_verbose (" (policy) skipping rule for different path\n"); |
| 943 | continue; |
| 944 | } |
| 945 | } |
| 946 | |
| 947 | if (rule->d.send.interface != NULL) |
| 948 | { |
| 949 | /* The interface is optional in messages. For allow rules, if the message |
| 950 | * has no interface we want to skip the rule (and thus not allow); |
| 951 | * for deny rules, if the message has no interface we want to use the |
| 952 | * rule (and thus deny). |
| 953 | */ |
| 954 | dbus_bool_t no_interface; |
| 955 | |
| 956 | no_interface = dbus_message_get_interface (message) == NULL; |
| 957 | |
| 958 | if ((no_interface && rule->allow) || |
| 959 | (!no_interface && |
| 960 | strcmp (dbus_message_get_interface (message), |
| 961 | rule->d.send.interface) != 0)) |
| 962 | { |
| 963 | _dbus_verbose (" (policy) skipping rule for different interface\n"); |
| 964 | continue; |
| 965 | } |
| 966 | } |
| 967 | |
| 968 | if (rule->d.send.member != NULL) |
| 969 | { |
| 970 | if (dbus_message_get_member (message) != NULL && |
| 971 | strcmp (dbus_message_get_member (message), |
| 972 | rule->d.send.member) != 0) |
| 973 | { |
| 974 | _dbus_verbose (" (policy) skipping rule for different member\n"); |
| 975 | continue; |
| 976 | } |
| 977 | } |
| 978 | |
| 979 | if (rule->d.send.error != NULL) |
| 980 | { |
| 981 | if (dbus_message_get_error_name (message) != NULL && |
| 982 | strcmp (dbus_message_get_error_name (message), |
| 983 | rule->d.send.error) != 0) |
| 984 | { |
| 985 | _dbus_verbose (" (policy) skipping rule for different error name\n"); |
| 986 | continue; |
| 987 | } |
| 988 | } |
| 989 | |
| 990 | if (rule->d.send.destination != NULL) |
| 991 | { |
| 992 | /* receiver can be NULL for messages that are sent to the |
| 993 | * message bus itself, we check the strings in that case as |
| 994 | * built-in services don't have a DBusConnection but messages |
| 995 | * to them have a destination service name. |
| 996 | */ |
| 997 | if (receiver == NULL) |
| 998 | { |
| 999 | if (!dbus_message_has_destination (message, |
| 1000 | rule->d.send.destination)) |
| 1001 | { |
| 1002 | _dbus_verbose (" (policy) skipping rule because message dest is not %s\n", |
| 1003 | rule->d.send.destination); |
| 1004 | continue; |
| 1005 | } |
| 1006 | } |
| 1007 | else |
| 1008 | { |
| 1009 | DBusString str; |
| 1010 | BusService *service; |
| 1011 | |
| 1012 | _dbus_string_init_const (&str, rule->d.send.destination); |
| 1013 | |
| 1014 | service = bus_registry_lookup (registry, &str); |
| 1015 | if (service == NULL) |
| 1016 | { |
| 1017 | _dbus_verbose (" (policy) skipping rule because dest %s doesn't exist\n", |
| 1018 | rule->d.send.destination); |
| 1019 | continue; |
| 1020 | } |
| 1021 | |
| 1022 | if (!bus_service_has_owner (service, receiver)) |
| 1023 | { |
| 1024 | _dbus_verbose (" (policy) skipping rule because dest %s isn't owned by receiver\n", |
| 1025 | rule->d.send.destination); |
| 1026 | continue; |
| 1027 | } |
| 1028 | } |
| 1029 | } |
| 1030 | |
| 1031 | /* Use this rule */ |
| 1032 | allowed = rule->allow; |
| 1033 | *log = rule->d.send.log; |
| 1034 | (*toggles)++; |
| 1035 | |
| 1036 | _dbus_verbose (" (policy) used rule, allow now = %d\n", |
| 1037 | allowed); |
| 1038 | } |
| 1039 | |
| 1040 | return allowed; |
| 1041 | } |
| 1042 | |
| 1043 | /* See docs on what the args mean on bus_context_check_security_policy() |
| 1044 | * comment |
| 1045 | */ |
| 1046 | dbus_bool_t |
| 1047 | bus_client_policy_check_can_receive (BusClientPolicy *policy, |
| 1048 | BusRegistry *registry, |
| 1049 | dbus_bool_t requested_reply, |
| 1050 | DBusConnection *sender, |
| 1051 | DBusConnection *addressed_recipient, |
| 1052 | DBusConnection *proposed_recipient, |
| 1053 | DBusMessage *message, |
| 1054 | dbus_int32_t *toggles) |
| 1055 | { |
| 1056 | DBusList *link; |
| 1057 | dbus_bool_t allowed; |
| 1058 | dbus_bool_t eavesdropping; |
| 1059 | |
| 1060 | eavesdropping = |
| 1061 | addressed_recipient != proposed_recipient && |
| 1062 | dbus_message_get_destination (message) != NULL; |
| 1063 | |
| 1064 | /* policy->rules is in the order the rules appeared |
| 1065 | * in the config file, i.e. last rule that applies wins |
| 1066 | */ |
| 1067 | |
| 1068 | _dbus_verbose (" (policy) checking receive rules, eavesdropping = %d\n", eavesdropping); |
| 1069 | *toggles = 0; |
| 1070 | |
| 1071 | allowed = FALSE; |
| 1072 | link = _dbus_list_get_first_link (&policy->rules); |
| 1073 | while (link != NULL) |
| 1074 | { |
| 1075 | BusPolicyRule *rule = link->data; |
| 1076 | |
| 1077 | link = _dbus_list_get_next_link (&policy->rules, link); |
| 1078 | |
| 1079 | if (rule->type != BUS_POLICY_RULE_RECEIVE) |
| 1080 | { |
| 1081 | _dbus_verbose (" (policy) skipping non-receive rule\n"); |
| 1082 | continue; |
| 1083 | } |
| 1084 | |
| 1085 | if (rule->d.receive.message_type != DBUS_MESSAGE_TYPE_INVALID) |
| 1086 | { |
| 1087 | if (dbus_message_get_type (message) != rule->d.receive.message_type) |
| 1088 | { |
| 1089 | _dbus_verbose (" (policy) skipping rule for different message type\n"); |
| 1090 | continue; |
| 1091 | } |
| 1092 | } |
| 1093 | |
| 1094 | /* for allow, eavesdrop=false means the rule doesn't apply when |
| 1095 | * eavesdropping. eavesdrop=true means always allow. |
| 1096 | */ |
| 1097 | if (eavesdropping && rule->allow && !rule->d.receive.eavesdrop) |
| 1098 | { |
| 1099 | _dbus_verbose (" (policy) skipping allow rule since it doesn't apply to eavesdropping\n"); |
| 1100 | continue; |
| 1101 | } |
| 1102 | |
| 1103 | /* for deny, eavesdrop=true means the rule applies only when |
| 1104 | * eavesdropping; eavesdrop=false means always deny. |
| 1105 | */ |
| 1106 | if (!eavesdropping && !rule->allow && rule->d.receive.eavesdrop) |
| 1107 | { |
| 1108 | _dbus_verbose (" (policy) skipping deny rule since it only applies to eavesdropping\n"); |
| 1109 | continue; |
| 1110 | } |
| 1111 | |
| 1112 | /* If it's a reply, the requested_reply flag kicks in */ |
| 1113 | if (dbus_message_get_reply_serial (message) != 0) |
| 1114 | { |
| 1115 | /* for allow, requested_reply=true means the rule applies |
| 1116 | * only when reply was requested. requested_reply=false means |
| 1117 | * always allow. |
| 1118 | */ |
| 1119 | if (!requested_reply && rule->allow && rule->d.receive.requested_reply && !rule->d.receive.eavesdrop) |
| 1120 | { |
| 1121 | _dbus_verbose (" (policy) skipping allow rule since it only applies to requested replies and does not allow eavesdropping\n"); |
| 1122 | continue; |
| 1123 | } |
| 1124 | |
| 1125 | /* for deny, requested_reply=false means the rule applies only |
| 1126 | * when the reply was not requested. requested_reply=true means the |
| 1127 | * rule always applies. |
| 1128 | */ |
| 1129 | if (requested_reply && !rule->allow && !rule->d.receive.requested_reply) |
| 1130 | { |
| 1131 | _dbus_verbose (" (policy) skipping deny rule since it only applies to unrequested replies\n"); |
| 1132 | continue; |
| 1133 | } |
| 1134 | } |
| 1135 | |
| 1136 | if (rule->d.receive.path != NULL) |
| 1137 | { |
| 1138 | if (dbus_message_get_path (message) != NULL && |
| 1139 | strcmp (dbus_message_get_path (message), |
| 1140 | rule->d.receive.path) != 0) |
| 1141 | { |
| 1142 | _dbus_verbose (" (policy) skipping rule for different path\n"); |
| 1143 | continue; |
| 1144 | } |
| 1145 | } |
| 1146 | |
| 1147 | if (rule->d.receive.interface != NULL) |
| 1148 | { |
| 1149 | /* The interface is optional in messages. For allow rules, if the message |
| 1150 | * has no interface we want to skip the rule (and thus not allow); |
| 1151 | * for deny rules, if the message has no interface we want to use the |
| 1152 | * rule (and thus deny). |
| 1153 | */ |
| 1154 | dbus_bool_t no_interface; |
| 1155 | |
| 1156 | no_interface = dbus_message_get_interface (message) == NULL; |
| 1157 | |
| 1158 | if ((no_interface && rule->allow) || |
| 1159 | (!no_interface && |
| 1160 | strcmp (dbus_message_get_interface (message), |
| 1161 | rule->d.receive.interface) != 0)) |
| 1162 | { |
| 1163 | _dbus_verbose (" (policy) skipping rule for different interface\n"); |
| 1164 | continue; |
| 1165 | } |
| 1166 | } |
| 1167 | |
| 1168 | if (rule->d.receive.member != NULL) |
| 1169 | { |
| 1170 | if (dbus_message_get_member (message) != NULL && |
| 1171 | strcmp (dbus_message_get_member (message), |
| 1172 | rule->d.receive.member) != 0) |
| 1173 | { |
| 1174 | _dbus_verbose (" (policy) skipping rule for different member\n"); |
| 1175 | continue; |
| 1176 | } |
| 1177 | } |
| 1178 | |
| 1179 | if (rule->d.receive.error != NULL) |
| 1180 | { |
| 1181 | if (dbus_message_get_error_name (message) != NULL && |
| 1182 | strcmp (dbus_message_get_error_name (message), |
| 1183 | rule->d.receive.error) != 0) |
| 1184 | { |
| 1185 | _dbus_verbose (" (policy) skipping rule for different error name\n"); |
| 1186 | continue; |
| 1187 | } |
| 1188 | } |
| 1189 | |
| 1190 | if (rule->d.receive.origin != NULL) |
| 1191 | { |
| 1192 | /* sender can be NULL for messages that originate from the |
| 1193 | * message bus itself, we check the strings in that case as |
| 1194 | * built-in services don't have a DBusConnection but will |
| 1195 | * still set the sender on their messages. |
| 1196 | */ |
| 1197 | if (sender == NULL) |
| 1198 | { |
| 1199 | if (!dbus_message_has_sender (message, |
| 1200 | rule->d.receive.origin)) |
| 1201 | { |
| 1202 | _dbus_verbose (" (policy) skipping rule because message sender is not %s\n", |
| 1203 | rule->d.receive.origin); |
| 1204 | continue; |
| 1205 | } |
| 1206 | } |
| 1207 | else |
| 1208 | { |
| 1209 | BusService *service; |
| 1210 | DBusString str; |
| 1211 | |
| 1212 | _dbus_string_init_const (&str, rule->d.receive.origin); |
| 1213 | |
| 1214 | service = bus_registry_lookup (registry, &str); |
| 1215 | |
| 1216 | if (service == NULL) |
| 1217 | { |
| 1218 | _dbus_verbose (" (policy) skipping rule because origin %s doesn't exist\n", |
| 1219 | rule->d.receive.origin); |
| 1220 | continue; |
| 1221 | } |
| 1222 | |
| 1223 | if (!bus_service_has_owner (service, sender)) |
| 1224 | { |
| 1225 | _dbus_verbose (" (policy) skipping rule because origin %s isn't owned by sender\n", |
| 1226 | rule->d.receive.origin); |
| 1227 | continue; |
| 1228 | } |
| 1229 | } |
| 1230 | } |
| 1231 | |
| 1232 | /* Use this rule */ |
| 1233 | allowed = rule->allow; |
| 1234 | (*toggles)++; |
| 1235 | |
| 1236 | _dbus_verbose (" (policy) used rule, allow now = %d\n", |
| 1237 | allowed); |
| 1238 | } |
| 1239 | |
| 1240 | return allowed; |
| 1241 | } |
| 1242 | |
| 1243 | dbus_bool_t |
| 1244 | bus_client_policy_check_can_own (BusClientPolicy *policy, |
| 1245 | DBusConnection *connection, |
| 1246 | const DBusString *service_name) |
| 1247 | { |
| 1248 | DBusList *link; |
| 1249 | dbus_bool_t allowed; |
| 1250 | |
| 1251 | /* policy->rules is in the order the rules appeared |
| 1252 | * in the config file, i.e. last rule that applies wins |
| 1253 | */ |
| 1254 | |
| 1255 | allowed = FALSE; |
| 1256 | link = _dbus_list_get_first_link (&policy->rules); |
| 1257 | while (link != NULL) |
| 1258 | { |
| 1259 | BusPolicyRule *rule = link->data; |
| 1260 | |
| 1261 | link = _dbus_list_get_next_link (&policy->rules, link); |
| 1262 | |
| 1263 | /* Rule is skipped if it specifies a different service name from |
| 1264 | * the desired one. |
| 1265 | */ |
| 1266 | |
| 1267 | if (rule->type != BUS_POLICY_RULE_OWN) |
| 1268 | continue; |
| 1269 | |
| 1270 | if (rule->d.own.service_name != NULL) |
| 1271 | { |
| 1272 | if (!_dbus_string_equal_c_str (service_name, |
| 1273 | rule->d.own.service_name)) |
| 1274 | continue; |
| 1275 | } |
| 1276 | |
| 1277 | /* Use this rule */ |
| 1278 | allowed = rule->allow; |
| 1279 | } |
| 1280 | |
| 1281 | return allowed; |
| 1282 | } |
| 1283 | |
| 1284 | #ifdef DBUS_BUILD_TESTS |
| 1285 | |
| 1286 | dbus_bool_t |
| 1287 | bus_policy_test (const DBusString *test_data_dir) |
| 1288 | { |
| 1289 | /* This doesn't do anything for now because I decided to do it in |
| 1290 | * dispatch.c instead by having some of the clients in dispatch.c |
| 1291 | * have particular policies applied to them. |
| 1292 | */ |
| 1293 | |
| 1294 | return TRUE; |
| 1295 | } |
| 1296 | |
| 1297 | #endif /* DBUS_BUILD_TESTS */ |