1 /* 2 * util/fptr_wlist.c - function pointer whitelists. 3 * 4 * Copyright (c) 2007, NLnet Labs. All rights reserved. 5 * 6 * This software is open source. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * Redistributions of source code must retain the above copyright notice, 13 * this list of conditions and the following disclaimer. 14 * 15 * Redistributions in binary form must reproduce the above copyright notice, 16 * this list of conditions and the following disclaimer in the documentation 17 * and/or other materials provided with the distribution. 18 * 19 * Neither the name of the NLNET LABS nor the names of its contributors may 20 * be used to endorse or promote products derived from this software without 21 * specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 24 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 26 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 27 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 29 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 30 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 /** 37 * \file 38 * 39 * This file contains functions that check function pointers. 40 * The functions contain a whitelist of known good callback values. 41 * Any other values lead to an error. 42 * 43 * Due to the listing nature, this file violates all the modularization 44 * boundaries in the program. 45 */ 46 #include "config.h" 47 #include "util/fptr_wlist.h" 48 #include "util/mini_event.h" 49 #include "services/outside_network.h" 50 #include "services/mesh.h" 51 #include "services/localzone.h" 52 #include "services/authzone.h" 53 #include "services/cache/infra.h" 54 #include "services/cache/rrset.h" 55 #include "services/view.h" 56 #include "dns64/dns64.h" 57 #include "iterator/iterator.h" 58 #include "iterator/iter_fwd.h" 59 #include "validator/validator.h" 60 #include "validator/val_anchor.h" 61 #include "validator/val_nsec3.h" 62 #include "validator/val_sigcrypt.h" 63 #include "validator/val_kentry.h" 64 #include "validator/val_neg.h" 65 #include "validator/autotrust.h" 66 #include "util/data/msgreply.h" 67 #include "util/data/packed_rrset.h" 68 #include "util/storage/slabhash.h" 69 #include "util/storage/dnstree.h" 70 #include "util/locks.h" 71 #include "libunbound/libworker.h" 72 #include "libunbound/context.h" 73 #include "libunbound/worker.h" 74 #include "util/tube.h" 75 #include "util/config_file.h" 76 #ifdef UB_ON_WINDOWS 77 #include "winrc/win_svc.h" 78 #endif 79 #include "respip/respip.h" 80 81 #ifdef WITH_PYTHONMODULE 82 #include "pythonmod/pythonmod.h" 83 #endif 84 #ifdef USE_CACHEDB 85 #include "cachedb/cachedb.h" 86 #endif 87 #ifdef USE_IPSECMOD 88 #include "ipsecmod/ipsecmod.h" 89 #endif 90 #ifdef CLIENT_SUBNET 91 #include "edns-subnet/subnetmod.h" 92 #endif 93 94 int 95 fptr_whitelist_comm_point(comm_point_callback_type *fptr) 96 { 97 if(fptr == &worker_handle_request) return 1; 98 else if(fptr == &outnet_udp_cb) return 1; 99 else if(fptr == &outnet_tcp_cb) return 1; 100 else if(fptr == &tube_handle_listen) return 1; 101 else if(fptr == &auth_xfer_probe_udp_callback) return 1; 102 else if(fptr == &auth_xfer_transfer_tcp_callback) return 1; 103 else if(fptr == &auth_xfer_transfer_http_callback) return 1; 104 return 0; 105 } 106 107 int 108 fptr_whitelist_comm_point_raw(comm_point_callback_type *fptr) 109 { 110 if(fptr == &tube_handle_listen) return 1; 111 else if(fptr == &tube_handle_write) return 1; 112 else if(fptr == &remote_accept_callback) return 1; 113 else if(fptr == &remote_control_callback) return 1; 114 return 0; 115 } 116 117 int 118 fptr_whitelist_comm_timer(void (*fptr)(void*)) 119 { 120 if(fptr == &pending_udp_timer_cb) return 1; 121 else if(fptr == &outnet_tcptimer) return 1; 122 else if(fptr == &pending_udp_timer_delay_cb) return 1; 123 else if(fptr == &worker_stat_timer_cb) return 1; 124 else if(fptr == &worker_probe_timer_cb) return 1; 125 #ifdef UB_ON_WINDOWS 126 else if(fptr == &wsvc_cron_cb) return 1; 127 #endif 128 else if(fptr == &auth_xfer_timer) return 1; 129 else if(fptr == &auth_xfer_probe_timer_callback) return 1; 130 return 0; 131 } 132 133 int 134 fptr_whitelist_comm_signal(void (*fptr)(int, void*)) 135 { 136 if(fptr == &worker_sighandler) return 1; 137 return 0; 138 } 139 140 int fptr_whitelist_start_accept(void (*fptr)(void*)) 141 { 142 if(fptr == &worker_start_accept) return 1; 143 return 0; 144 } 145 146 int fptr_whitelist_stop_accept(void (*fptr)(void*)) 147 { 148 if(fptr == &worker_stop_accept) return 1; 149 return 0; 150 } 151 152 int 153 fptr_whitelist_event(void (*fptr)(int, short, void *)) 154 { 155 if(fptr == &comm_point_udp_callback) return 1; 156 else if(fptr == &comm_point_udp_ancil_callback) return 1; 157 else if(fptr == &comm_point_tcp_accept_callback) return 1; 158 else if(fptr == &comm_point_tcp_handle_callback) return 1; 159 else if(fptr == &comm_timer_callback) return 1; 160 else if(fptr == &comm_signal_callback) return 1; 161 else if(fptr == &comm_point_local_handle_callback) return 1; 162 else if(fptr == &comm_point_raw_handle_callback) return 1; 163 else if(fptr == &tube_handle_signal) return 1; 164 else if(fptr == &comm_base_handle_slow_accept) return 1; 165 else if(fptr == &comm_point_http_handle_callback) return 1; 166 #ifdef UB_ON_WINDOWS 167 else if(fptr == &worker_win_stop_cb) return 1; 168 #endif 169 return 0; 170 } 171 172 int 173 fptr_whitelist_pending_udp(comm_point_callback_type *fptr) 174 { 175 if(fptr == &serviced_udp_callback) return 1; 176 else if(fptr == &worker_handle_reply) return 1; 177 else if(fptr == &libworker_handle_reply) return 1; 178 return 0; 179 } 180 181 int 182 fptr_whitelist_pending_tcp(comm_point_callback_type *fptr) 183 { 184 if(fptr == &serviced_tcp_callback) return 1; 185 else if(fptr == &worker_handle_reply) return 1; 186 else if(fptr == &libworker_handle_reply) return 1; 187 return 0; 188 } 189 190 int 191 fptr_whitelist_serviced_query(comm_point_callback_type *fptr) 192 { 193 if(fptr == &worker_handle_service_reply) return 1; 194 else if(fptr == &libworker_handle_service_reply) return 1; 195 return 0; 196 } 197 198 int 199 fptr_whitelist_rbtree_cmp(int (*fptr) (const void *, const void *)) 200 { 201 if(fptr == &mesh_state_compare) return 1; 202 else if(fptr == &mesh_state_ref_compare) return 1; 203 else if(fptr == &addr_tree_compare) return 1; 204 else if(fptr == &local_zone_cmp) return 1; 205 else if(fptr == &local_data_cmp) return 1; 206 else if(fptr == &fwd_cmp) return 1; 207 else if(fptr == &pending_cmp) return 1; 208 else if(fptr == &serviced_cmp) return 1; 209 else if(fptr == &name_tree_compare) return 1; 210 else if(fptr == &order_lock_cmp) return 1; 211 else if(fptr == &codeline_cmp) return 1; 212 else if(fptr == &nsec3_hash_cmp) return 1; 213 else if(fptr == &mini_ev_cmp) return 1; 214 else if(fptr == &anchor_cmp) return 1; 215 else if(fptr == &canonical_tree_compare) return 1; 216 else if(fptr == &context_query_cmp) return 1; 217 else if(fptr == &val_neg_data_compare) return 1; 218 else if(fptr == &val_neg_zone_compare) return 1; 219 else if(fptr == &probetree_cmp) return 1; 220 else if(fptr == &replay_var_compare) return 1; 221 else if(fptr == &view_cmp) return 1; 222 else if(fptr == &auth_zone_cmp) return 1; 223 else if(fptr == &auth_data_cmp) return 1; 224 else if(fptr == &auth_xfer_cmp) return 1; 225 return 0; 226 } 227 228 int 229 fptr_whitelist_hash_sizefunc(lruhash_sizefunc_type fptr) 230 { 231 if(fptr == &msgreply_sizefunc) return 1; 232 else if(fptr == &ub_rrset_sizefunc) return 1; 233 else if(fptr == &infra_sizefunc) return 1; 234 else if(fptr == &key_entry_sizefunc) return 1; 235 else if(fptr == &rate_sizefunc) return 1; 236 else if(fptr == &ip_rate_sizefunc) return 1; 237 else if(fptr == &test_slabhash_sizefunc) return 1; 238 #ifdef CLIENT_SUBNET 239 else if(fptr == &msg_cache_sizefunc) return 1; 240 #endif 241 #ifdef USE_DNSCRYPT 242 else if(fptr == &dnsc_shared_secrets_sizefunc) return 1; 243 else if(fptr == &dnsc_nonces_sizefunc) return 1; 244 #endif 245 return 0; 246 } 247 248 int 249 fptr_whitelist_hash_compfunc(lruhash_compfunc_type fptr) 250 { 251 if(fptr == &query_info_compare) return 1; 252 else if(fptr == &ub_rrset_compare) return 1; 253 else if(fptr == &infra_compfunc) return 1; 254 else if(fptr == &key_entry_compfunc) return 1; 255 else if(fptr == &rate_compfunc) return 1; 256 else if(fptr == &ip_rate_compfunc) return 1; 257 else if(fptr == &test_slabhash_compfunc) return 1; 258 #ifdef USE_DNSCRYPT 259 else if(fptr == &dnsc_shared_secrets_compfunc) return 1; 260 else if(fptr == &dnsc_nonces_compfunc) return 1; 261 #endif 262 return 0; 263 } 264 265 int 266 fptr_whitelist_hash_delkeyfunc(lruhash_delkeyfunc_type fptr) 267 { 268 if(fptr == &query_entry_delete) return 1; 269 else if(fptr == &ub_rrset_key_delete) return 1; 270 else if(fptr == &infra_delkeyfunc) return 1; 271 else if(fptr == &key_entry_delkeyfunc) return 1; 272 else if(fptr == &rate_delkeyfunc) return 1; 273 else if(fptr == &ip_rate_delkeyfunc) return 1; 274 else if(fptr == &test_slabhash_delkey) return 1; 275 #ifdef USE_DNSCRYPT 276 else if(fptr == &dnsc_shared_secrets_delkeyfunc) return 1; 277 else if(fptr == &dnsc_nonces_delkeyfunc) return 1; 278 #endif 279 return 0; 280 } 281 282 int 283 fptr_whitelist_hash_deldatafunc(lruhash_deldatafunc_type fptr) 284 { 285 if(fptr == &reply_info_delete) return 1; 286 else if(fptr == &rrset_data_delete) return 1; 287 else if(fptr == &infra_deldatafunc) return 1; 288 else if(fptr == &key_entry_deldatafunc) return 1; 289 else if(fptr == &rate_deldatafunc) return 1; 290 else if(fptr == &test_slabhash_deldata) return 1; 291 #ifdef CLIENT_SUBNET 292 else if(fptr == &subnet_data_delete) return 1; 293 #endif 294 #ifdef USE_DNSCRYPT 295 else if(fptr == &dnsc_shared_secrets_deldatafunc) return 1; 296 else if(fptr == &dnsc_nonces_deldatafunc) return 1; 297 #endif 298 return 0; 299 } 300 301 int 302 fptr_whitelist_hash_markdelfunc(lruhash_markdelfunc_type fptr) 303 { 304 if(fptr == NULL) return 1; 305 else if(fptr == &rrset_markdel) return 1; 306 #ifdef CLIENT_SUBNET 307 else if(fptr == &subnet_markdel) return 1; 308 #endif 309 return 0; 310 } 311 312 /** whitelist env->send_query callbacks */ 313 int 314 fptr_whitelist_modenv_send_query(struct outbound_entry* (*fptr)( 315 struct query_info* qinfo, uint16_t flags, int dnssec, int want_dnssec, 316 int nocaps, struct sockaddr_storage* addr, socklen_t addrlen, 317 uint8_t* zone, size_t zonelen, int ssl_upstream, char* tls_auth_name, 318 struct module_qstate* q)) 319 { 320 if(fptr == &worker_send_query) return 1; 321 else if(fptr == &libworker_send_query) return 1; 322 return 0; 323 } 324 325 int 326 fptr_whitelist_modenv_detach_subs(void (*fptr)( 327 struct module_qstate* qstate)) 328 { 329 if(fptr == &mesh_detach_subs) return 1; 330 return 0; 331 } 332 333 int 334 fptr_whitelist_modenv_attach_sub(int (*fptr)( 335 struct module_qstate* qstate, struct query_info* qinfo, 336 uint16_t qflags, int prime, int valrec, struct module_qstate** newq)) 337 { 338 if(fptr == &mesh_attach_sub) return 1; 339 return 0; 340 } 341 342 int 343 fptr_whitelist_modenv_add_sub(int (*fptr)( 344 struct module_qstate* qstate, struct query_info* qinfo, 345 uint16_t qflags, int prime, int valrec, struct module_qstate** newq, 346 struct mesh_state** sub)) 347 { 348 if(fptr == &mesh_add_sub) return 1; 349 return 0; 350 } 351 352 int 353 fptr_whitelist_modenv_kill_sub(void (*fptr)(struct module_qstate* newq)) 354 { 355 if(fptr == &mesh_state_delete) return 1; 356 return 0; 357 } 358 359 int 360 fptr_whitelist_modenv_detect_cycle(int (*fptr)( 361 struct module_qstate* qstate, struct query_info* qinfo, 362 uint16_t flags, int prime, int valrec)) 363 { 364 if(fptr == &mesh_detect_cycle) return 1; 365 return 0; 366 } 367 368 int 369 fptr_whitelist_mod_init(int (*fptr)(struct module_env* env, int id)) 370 { 371 if(fptr == &iter_init) return 1; 372 else if(fptr == &val_init) return 1; 373 else if(fptr == &dns64_init) return 1; 374 else if(fptr == &respip_init) return 1; 375 #ifdef WITH_PYTHONMODULE 376 else if(fptr == &pythonmod_init) return 1; 377 #endif 378 #ifdef USE_CACHEDB 379 else if(fptr == &cachedb_init) return 1; 380 #endif 381 #ifdef USE_IPSECMOD 382 else if(fptr == &ipsecmod_init) return 1; 383 #endif 384 #ifdef CLIENT_SUBNET 385 else if(fptr == &subnetmod_init) return 1; 386 #endif 387 return 0; 388 } 389 390 int 391 fptr_whitelist_mod_deinit(void (*fptr)(struct module_env* env, int id)) 392 { 393 if(fptr == &iter_deinit) return 1; 394 else if(fptr == &val_deinit) return 1; 395 else if(fptr == &dns64_deinit) return 1; 396 else if(fptr == &respip_deinit) return 1; 397 #ifdef WITH_PYTHONMODULE 398 else if(fptr == &pythonmod_deinit) return 1; 399 #endif 400 #ifdef USE_CACHEDB 401 else if(fptr == &cachedb_deinit) return 1; 402 #endif 403 #ifdef USE_IPSECMOD 404 else if(fptr == &ipsecmod_deinit) return 1; 405 #endif 406 #ifdef CLIENT_SUBNET 407 else if(fptr == &subnetmod_deinit) return 1; 408 #endif 409 return 0; 410 } 411 412 int 413 fptr_whitelist_mod_operate(void (*fptr)(struct module_qstate* qstate, 414 enum module_ev event, int id, struct outbound_entry* outbound)) 415 { 416 if(fptr == &iter_operate) return 1; 417 else if(fptr == &val_operate) return 1; 418 else if(fptr == &dns64_operate) return 1; 419 else if(fptr == &respip_operate) return 1; 420 #ifdef WITH_PYTHONMODULE 421 else if(fptr == &pythonmod_operate) return 1; 422 #endif 423 #ifdef USE_CACHEDB 424 else if(fptr == &cachedb_operate) return 1; 425 #endif 426 #ifdef USE_IPSECMOD 427 else if(fptr == &ipsecmod_operate) return 1; 428 #endif 429 #ifdef CLIENT_SUBNET 430 else if(fptr == &subnetmod_operate) return 1; 431 #endif 432 return 0; 433 } 434 435 int 436 fptr_whitelist_mod_inform_super(void (*fptr)( 437 struct module_qstate* qstate, int id, struct module_qstate* super)) 438 { 439 if(fptr == &iter_inform_super) return 1; 440 else if(fptr == &val_inform_super) return 1; 441 else if(fptr == &dns64_inform_super) return 1; 442 else if(fptr == &respip_inform_super) return 1; 443 #ifdef WITH_PYTHONMODULE 444 else if(fptr == &pythonmod_inform_super) return 1; 445 #endif 446 #ifdef USE_CACHEDB 447 else if(fptr == &cachedb_inform_super) return 1; 448 #endif 449 #ifdef USE_IPSECMOD 450 else if(fptr == &ipsecmod_inform_super) return 1; 451 #endif 452 #ifdef CLIENT_SUBNET 453 else if(fptr == &subnetmod_inform_super) return 1; 454 #endif 455 return 0; 456 } 457 458 int 459 fptr_whitelist_mod_clear(void (*fptr)(struct module_qstate* qstate, 460 int id)) 461 { 462 if(fptr == &iter_clear) return 1; 463 else if(fptr == &val_clear) return 1; 464 else if(fptr == &dns64_clear) return 1; 465 else if(fptr == &respip_clear) return 1; 466 #ifdef WITH_PYTHONMODULE 467 else if(fptr == &pythonmod_clear) return 1; 468 #endif 469 #ifdef USE_CACHEDB 470 else if(fptr == &cachedb_clear) return 1; 471 #endif 472 #ifdef USE_IPSECMOD 473 else if(fptr == &ipsecmod_clear) return 1; 474 #endif 475 #ifdef CLIENT_SUBNET 476 else if(fptr == &subnetmod_clear) return 1; 477 #endif 478 return 0; 479 } 480 481 int 482 fptr_whitelist_mod_get_mem(size_t (*fptr)(struct module_env* env, int id)) 483 { 484 if(fptr == &iter_get_mem) return 1; 485 else if(fptr == &val_get_mem) return 1; 486 else if(fptr == &dns64_get_mem) return 1; 487 else if(fptr == &respip_get_mem) return 1; 488 #ifdef WITH_PYTHONMODULE 489 else if(fptr == &pythonmod_get_mem) return 1; 490 #endif 491 #ifdef USE_CACHEDB 492 else if(fptr == &cachedb_get_mem) return 1; 493 #endif 494 #ifdef USE_IPSECMOD 495 else if(fptr == &ipsecmod_get_mem) return 1; 496 #endif 497 #ifdef CLIENT_SUBNET 498 else if(fptr == &subnetmod_get_mem) return 1; 499 #endif 500 return 0; 501 } 502 503 int 504 fptr_whitelist_alloc_cleanup(void (*fptr)(void*)) 505 { 506 if(fptr == &worker_alloc_cleanup) return 1; 507 return 0; 508 } 509 510 int fptr_whitelist_tube_listen(tube_callback_type* fptr) 511 { 512 if(fptr == &worker_handle_control_cmd) return 1; 513 else if(fptr == &libworker_handle_control_cmd) return 1; 514 return 0; 515 } 516 517 int fptr_whitelist_mesh_cb(mesh_cb_func_type fptr) 518 { 519 if(fptr == &libworker_fg_done_cb) return 1; 520 else if(fptr == &libworker_bg_done_cb) return 1; 521 else if(fptr == &libworker_event_done_cb) return 1; 522 else if(fptr == &probe_answer_cb) return 1; 523 else if(fptr == &auth_xfer_probe_lookup_callback) return 1; 524 else if(fptr == &auth_xfer_transfer_lookup_callback) return 1; 525 return 0; 526 } 527 528 int fptr_whitelist_print_func(void (*fptr)(char*,void*)) 529 { 530 if(fptr == &config_print_func) return 1; 531 else if(fptr == &config_collate_func) return 1; 532 else if(fptr == &remote_get_opt_ssl) return 1; 533 return 0; 534 } 535 536 int fptr_whitelist_inplace_cb_reply_generic(inplace_cb_reply_func_type* fptr, 537 enum inplace_cb_list_type type) 538 { 539 #ifndef WITH_PYTHONMODULE 540 (void)fptr; 541 #endif 542 if(type == inplace_cb_reply) { 543 #ifdef WITH_PYTHONMODULE 544 if(fptr == &python_inplace_cb_reply_generic) return 1; 545 #endif 546 } else if(type == inplace_cb_reply_cache) { 547 #ifdef WITH_PYTHONMODULE 548 if(fptr == &python_inplace_cb_reply_generic) return 1; 549 #endif 550 } else if(type == inplace_cb_reply_local) { 551 #ifdef WITH_PYTHONMODULE 552 if(fptr == &python_inplace_cb_reply_generic) return 1; 553 #endif 554 } else if(type == inplace_cb_reply_servfail) { 555 #ifdef WITH_PYTHONMODULE 556 if(fptr == &python_inplace_cb_reply_generic) return 1; 557 #endif 558 } 559 return 0; 560 } 561 562 int fptr_whitelist_inplace_cb_query(inplace_cb_query_func_type* fptr) 563 { 564 #ifdef CLIENT_SUBNET 565 if(fptr == &ecs_whitelist_check) 566 return 1; 567 #endif 568 #ifdef WITH_PYTHONMODULE 569 if(fptr == &python_inplace_cb_query_generic) 570 return 1; 571 #endif 572 (void)fptr; 573 return 0; 574 } 575 576 int fptr_whitelist_inplace_cb_edns_back_parsed( 577 inplace_cb_edns_back_parsed_func_type* fptr) 578 { 579 #ifdef CLIENT_SUBNET 580 if(fptr == &ecs_edns_back_parsed) 581 return 1; 582 #else 583 (void)fptr; 584 #endif 585 return 0; 586 } 587 588 int fptr_whitelist_inplace_cb_query_response( 589 inplace_cb_query_response_func_type* fptr) 590 { 591 #ifdef CLIENT_SUBNET 592 if(fptr == &ecs_query_response) 593 return 1; 594 #else 595 (void)fptr; 596 #endif 597 return 0; 598 } 599