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 else if(fptr == &auth_xfer_transfer_timer_callback) return 1; 131 return 0; 132 } 133 134 int 135 fptr_whitelist_comm_signal(void (*fptr)(int, void*)) 136 { 137 if(fptr == &worker_sighandler) return 1; 138 return 0; 139 } 140 141 int fptr_whitelist_start_accept(void (*fptr)(void*)) 142 { 143 if(fptr == &worker_start_accept) return 1; 144 return 0; 145 } 146 147 int fptr_whitelist_stop_accept(void (*fptr)(void*)) 148 { 149 if(fptr == &worker_stop_accept) return 1; 150 return 0; 151 } 152 153 int 154 fptr_whitelist_event(void (*fptr)(int, short, void *)) 155 { 156 if(fptr == &comm_point_udp_callback) return 1; 157 else if(fptr == &comm_point_udp_ancil_callback) return 1; 158 else if(fptr == &comm_point_tcp_accept_callback) return 1; 159 else if(fptr == &comm_point_tcp_handle_callback) return 1; 160 else if(fptr == &comm_timer_callback) return 1; 161 else if(fptr == &comm_signal_callback) return 1; 162 else if(fptr == &comm_point_local_handle_callback) return 1; 163 else if(fptr == &comm_point_raw_handle_callback) return 1; 164 else if(fptr == &tube_handle_signal) return 1; 165 else if(fptr == &comm_base_handle_slow_accept) return 1; 166 else if(fptr == &comm_point_http_handle_callback) return 1; 167 #ifdef UB_ON_WINDOWS 168 else if(fptr == &worker_win_stop_cb) return 1; 169 #endif 170 return 0; 171 } 172 173 int 174 fptr_whitelist_pending_udp(comm_point_callback_type *fptr) 175 { 176 if(fptr == &serviced_udp_callback) return 1; 177 else if(fptr == &worker_handle_reply) return 1; 178 else if(fptr == &libworker_handle_reply) return 1; 179 return 0; 180 } 181 182 int 183 fptr_whitelist_pending_tcp(comm_point_callback_type *fptr) 184 { 185 if(fptr == &serviced_tcp_callback) return 1; 186 else if(fptr == &worker_handle_reply) return 1; 187 else if(fptr == &libworker_handle_reply) return 1; 188 return 0; 189 } 190 191 int 192 fptr_whitelist_serviced_query(comm_point_callback_type *fptr) 193 { 194 if(fptr == &worker_handle_service_reply) return 1; 195 else if(fptr == &libworker_handle_service_reply) return 1; 196 return 0; 197 } 198 199 int 200 fptr_whitelist_rbtree_cmp(int (*fptr) (const void *, const void *)) 201 { 202 if(fptr == &mesh_state_compare) return 1; 203 else if(fptr == &mesh_state_ref_compare) return 1; 204 else if(fptr == &addr_tree_compare) return 1; 205 else if(fptr == &local_zone_cmp) return 1; 206 else if(fptr == &local_data_cmp) return 1; 207 else if(fptr == &fwd_cmp) return 1; 208 else if(fptr == &pending_cmp) return 1; 209 else if(fptr == &serviced_cmp) return 1; 210 else if(fptr == &name_tree_compare) return 1; 211 else if(fptr == &order_lock_cmp) return 1; 212 else if(fptr == &codeline_cmp) return 1; 213 else if(fptr == &nsec3_hash_cmp) return 1; 214 else if(fptr == &mini_ev_cmp) return 1; 215 else if(fptr == &anchor_cmp) return 1; 216 else if(fptr == &canonical_tree_compare) return 1; 217 else if(fptr == &context_query_cmp) return 1; 218 else if(fptr == &val_neg_data_compare) return 1; 219 else if(fptr == &val_neg_zone_compare) return 1; 220 else if(fptr == &probetree_cmp) return 1; 221 else if(fptr == &replay_var_compare) return 1; 222 else if(fptr == &view_cmp) return 1; 223 else if(fptr == &auth_zone_cmp) return 1; 224 else if(fptr == &auth_data_cmp) return 1; 225 else if(fptr == &auth_xfer_cmp) return 1; 226 return 0; 227 } 228 229 int 230 fptr_whitelist_hash_sizefunc(lruhash_sizefunc_type fptr) 231 { 232 if(fptr == &msgreply_sizefunc) return 1; 233 else if(fptr == &ub_rrset_sizefunc) return 1; 234 else if(fptr == &infra_sizefunc) return 1; 235 else if(fptr == &key_entry_sizefunc) return 1; 236 else if(fptr == &rate_sizefunc) return 1; 237 else if(fptr == &ip_rate_sizefunc) return 1; 238 else if(fptr == &test_slabhash_sizefunc) return 1; 239 #ifdef CLIENT_SUBNET 240 else if(fptr == &msg_cache_sizefunc) return 1; 241 #endif 242 #ifdef USE_DNSCRYPT 243 else if(fptr == &dnsc_shared_secrets_sizefunc) return 1; 244 else if(fptr == &dnsc_nonces_sizefunc) return 1; 245 #endif 246 return 0; 247 } 248 249 int 250 fptr_whitelist_hash_compfunc(lruhash_compfunc_type fptr) 251 { 252 if(fptr == &query_info_compare) return 1; 253 else if(fptr == &ub_rrset_compare) return 1; 254 else if(fptr == &infra_compfunc) return 1; 255 else if(fptr == &key_entry_compfunc) return 1; 256 else if(fptr == &rate_compfunc) return 1; 257 else if(fptr == &ip_rate_compfunc) return 1; 258 else if(fptr == &test_slabhash_compfunc) return 1; 259 #ifdef USE_DNSCRYPT 260 else if(fptr == &dnsc_shared_secrets_compfunc) return 1; 261 else if(fptr == &dnsc_nonces_compfunc) return 1; 262 #endif 263 return 0; 264 } 265 266 int 267 fptr_whitelist_hash_delkeyfunc(lruhash_delkeyfunc_type fptr) 268 { 269 if(fptr == &query_entry_delete) return 1; 270 else if(fptr == &ub_rrset_key_delete) return 1; 271 else if(fptr == &infra_delkeyfunc) return 1; 272 else if(fptr == &key_entry_delkeyfunc) return 1; 273 else if(fptr == &rate_delkeyfunc) return 1; 274 else if(fptr == &ip_rate_delkeyfunc) return 1; 275 else if(fptr == &test_slabhash_delkey) return 1; 276 #ifdef USE_DNSCRYPT 277 else if(fptr == &dnsc_shared_secrets_delkeyfunc) return 1; 278 else if(fptr == &dnsc_nonces_delkeyfunc) return 1; 279 #endif 280 return 0; 281 } 282 283 int 284 fptr_whitelist_hash_deldatafunc(lruhash_deldatafunc_type fptr) 285 { 286 if(fptr == &reply_info_delete) return 1; 287 else if(fptr == &rrset_data_delete) return 1; 288 else if(fptr == &infra_deldatafunc) return 1; 289 else if(fptr == &key_entry_deldatafunc) return 1; 290 else if(fptr == &rate_deldatafunc) return 1; 291 else if(fptr == &test_slabhash_deldata) return 1; 292 #ifdef CLIENT_SUBNET 293 else if(fptr == &subnet_data_delete) return 1; 294 #endif 295 #ifdef USE_DNSCRYPT 296 else if(fptr == &dnsc_shared_secrets_deldatafunc) return 1; 297 else if(fptr == &dnsc_nonces_deldatafunc) return 1; 298 #endif 299 return 0; 300 } 301 302 int 303 fptr_whitelist_hash_markdelfunc(lruhash_markdelfunc_type fptr) 304 { 305 if(fptr == NULL) return 1; 306 else if(fptr == &rrset_markdel) return 1; 307 #ifdef CLIENT_SUBNET 308 else if(fptr == &subnet_markdel) return 1; 309 #endif 310 return 0; 311 } 312 313 /** whitelist env->send_query callbacks */ 314 int 315 fptr_whitelist_modenv_send_query(struct outbound_entry* (*fptr)( 316 struct query_info* qinfo, uint16_t flags, int dnssec, int want_dnssec, 317 int nocaps, struct sockaddr_storage* addr, socklen_t addrlen, 318 uint8_t* zone, size_t zonelen, int ssl_upstream, char* tls_auth_name, 319 struct module_qstate* q)) 320 { 321 if(fptr == &worker_send_query) return 1; 322 else if(fptr == &libworker_send_query) return 1; 323 return 0; 324 } 325 326 int 327 fptr_whitelist_modenv_detach_subs(void (*fptr)( 328 struct module_qstate* qstate)) 329 { 330 if(fptr == &mesh_detach_subs) return 1; 331 return 0; 332 } 333 334 int 335 fptr_whitelist_modenv_attach_sub(int (*fptr)( 336 struct module_qstate* qstate, struct query_info* qinfo, 337 uint16_t qflags, int prime, int valrec, struct module_qstate** newq)) 338 { 339 if(fptr == &mesh_attach_sub) return 1; 340 return 0; 341 } 342 343 int 344 fptr_whitelist_modenv_add_sub(int (*fptr)( 345 struct module_qstate* qstate, struct query_info* qinfo, 346 uint16_t qflags, int prime, int valrec, struct module_qstate** newq, 347 struct mesh_state** sub)) 348 { 349 if(fptr == &mesh_add_sub) return 1; 350 return 0; 351 } 352 353 int 354 fptr_whitelist_modenv_kill_sub(void (*fptr)(struct module_qstate* newq)) 355 { 356 if(fptr == &mesh_state_delete) return 1; 357 return 0; 358 } 359 360 int 361 fptr_whitelist_modenv_detect_cycle(int (*fptr)( 362 struct module_qstate* qstate, struct query_info* qinfo, 363 uint16_t flags, int prime, int valrec)) 364 { 365 if(fptr == &mesh_detect_cycle) return 1; 366 return 0; 367 } 368 369 int 370 fptr_whitelist_mod_init(int (*fptr)(struct module_env* env, int id)) 371 { 372 if(fptr == &iter_init) return 1; 373 else if(fptr == &val_init) return 1; 374 else if(fptr == &dns64_init) return 1; 375 else if(fptr == &respip_init) return 1; 376 #ifdef WITH_PYTHONMODULE 377 else if(fptr == &pythonmod_init) return 1; 378 #endif 379 #ifdef USE_CACHEDB 380 else if(fptr == &cachedb_init) return 1; 381 #endif 382 #ifdef USE_IPSECMOD 383 else if(fptr == &ipsecmod_init) return 1; 384 #endif 385 #ifdef CLIENT_SUBNET 386 else if(fptr == &subnetmod_init) return 1; 387 #endif 388 return 0; 389 } 390 391 int 392 fptr_whitelist_mod_deinit(void (*fptr)(struct module_env* env, int id)) 393 { 394 if(fptr == &iter_deinit) return 1; 395 else if(fptr == &val_deinit) return 1; 396 else if(fptr == &dns64_deinit) return 1; 397 else if(fptr == &respip_deinit) return 1; 398 #ifdef WITH_PYTHONMODULE 399 else if(fptr == &pythonmod_deinit) return 1; 400 #endif 401 #ifdef USE_CACHEDB 402 else if(fptr == &cachedb_deinit) return 1; 403 #endif 404 #ifdef USE_IPSECMOD 405 else if(fptr == &ipsecmod_deinit) return 1; 406 #endif 407 #ifdef CLIENT_SUBNET 408 else if(fptr == &subnetmod_deinit) return 1; 409 #endif 410 return 0; 411 } 412 413 int 414 fptr_whitelist_mod_operate(void (*fptr)(struct module_qstate* qstate, 415 enum module_ev event, int id, struct outbound_entry* outbound)) 416 { 417 if(fptr == &iter_operate) return 1; 418 else if(fptr == &val_operate) return 1; 419 else if(fptr == &dns64_operate) return 1; 420 else if(fptr == &respip_operate) return 1; 421 #ifdef WITH_PYTHONMODULE 422 else if(fptr == &pythonmod_operate) return 1; 423 #endif 424 #ifdef USE_CACHEDB 425 else if(fptr == &cachedb_operate) return 1; 426 #endif 427 #ifdef USE_IPSECMOD 428 else if(fptr == &ipsecmod_operate) return 1; 429 #endif 430 #ifdef CLIENT_SUBNET 431 else if(fptr == &subnetmod_operate) return 1; 432 #endif 433 return 0; 434 } 435 436 int 437 fptr_whitelist_mod_inform_super(void (*fptr)( 438 struct module_qstate* qstate, int id, struct module_qstate* super)) 439 { 440 if(fptr == &iter_inform_super) return 1; 441 else if(fptr == &val_inform_super) return 1; 442 else if(fptr == &dns64_inform_super) return 1; 443 else if(fptr == &respip_inform_super) return 1; 444 #ifdef WITH_PYTHONMODULE 445 else if(fptr == &pythonmod_inform_super) return 1; 446 #endif 447 #ifdef USE_CACHEDB 448 else if(fptr == &cachedb_inform_super) return 1; 449 #endif 450 #ifdef USE_IPSECMOD 451 else if(fptr == &ipsecmod_inform_super) return 1; 452 #endif 453 #ifdef CLIENT_SUBNET 454 else if(fptr == &subnetmod_inform_super) return 1; 455 #endif 456 return 0; 457 } 458 459 int 460 fptr_whitelist_mod_clear(void (*fptr)(struct module_qstate* qstate, 461 int id)) 462 { 463 if(fptr == &iter_clear) return 1; 464 else if(fptr == &val_clear) return 1; 465 else if(fptr == &dns64_clear) return 1; 466 else if(fptr == &respip_clear) return 1; 467 #ifdef WITH_PYTHONMODULE 468 else if(fptr == &pythonmod_clear) return 1; 469 #endif 470 #ifdef USE_CACHEDB 471 else if(fptr == &cachedb_clear) return 1; 472 #endif 473 #ifdef USE_IPSECMOD 474 else if(fptr == &ipsecmod_clear) return 1; 475 #endif 476 #ifdef CLIENT_SUBNET 477 else if(fptr == &subnetmod_clear) return 1; 478 #endif 479 return 0; 480 } 481 482 int 483 fptr_whitelist_mod_get_mem(size_t (*fptr)(struct module_env* env, int id)) 484 { 485 if(fptr == &iter_get_mem) return 1; 486 else if(fptr == &val_get_mem) return 1; 487 else if(fptr == &dns64_get_mem) return 1; 488 else if(fptr == &respip_get_mem) return 1; 489 #ifdef WITH_PYTHONMODULE 490 else if(fptr == &pythonmod_get_mem) return 1; 491 #endif 492 #ifdef USE_CACHEDB 493 else if(fptr == &cachedb_get_mem) return 1; 494 #endif 495 #ifdef USE_IPSECMOD 496 else if(fptr == &ipsecmod_get_mem) return 1; 497 #endif 498 #ifdef CLIENT_SUBNET 499 else if(fptr == &subnetmod_get_mem) return 1; 500 #endif 501 return 0; 502 } 503 504 int 505 fptr_whitelist_alloc_cleanup(void (*fptr)(void*)) 506 { 507 if(fptr == &worker_alloc_cleanup) return 1; 508 return 0; 509 } 510 511 int fptr_whitelist_tube_listen(tube_callback_type* fptr) 512 { 513 if(fptr == &worker_handle_control_cmd) return 1; 514 else if(fptr == &libworker_handle_control_cmd) return 1; 515 return 0; 516 } 517 518 int fptr_whitelist_mesh_cb(mesh_cb_func_type fptr) 519 { 520 if(fptr == &libworker_fg_done_cb) return 1; 521 else if(fptr == &libworker_bg_done_cb) return 1; 522 else if(fptr == &libworker_event_done_cb) return 1; 523 else if(fptr == &probe_answer_cb) return 1; 524 else if(fptr == &auth_xfer_probe_lookup_callback) return 1; 525 else if(fptr == &auth_xfer_transfer_lookup_callback) return 1; 526 return 0; 527 } 528 529 int fptr_whitelist_print_func(void (*fptr)(char*,void*)) 530 { 531 if(fptr == &config_print_func) return 1; 532 else if(fptr == &config_collate_func) return 1; 533 else if(fptr == &remote_get_opt_ssl) return 1; 534 return 0; 535 } 536 537 int fptr_whitelist_inplace_cb_reply_generic(inplace_cb_reply_func_type* fptr, 538 enum inplace_cb_list_type type) 539 { 540 #ifndef WITH_PYTHONMODULE 541 (void)fptr; 542 #endif 543 if(type == inplace_cb_reply) { 544 #ifdef WITH_PYTHONMODULE 545 if(fptr == &python_inplace_cb_reply_generic) return 1; 546 #endif 547 } else if(type == inplace_cb_reply_cache) { 548 #ifdef WITH_PYTHONMODULE 549 if(fptr == &python_inplace_cb_reply_generic) return 1; 550 #endif 551 } else if(type == inplace_cb_reply_local) { 552 #ifdef WITH_PYTHONMODULE 553 if(fptr == &python_inplace_cb_reply_generic) return 1; 554 #endif 555 } else if(type == inplace_cb_reply_servfail) { 556 #ifdef WITH_PYTHONMODULE 557 if(fptr == &python_inplace_cb_reply_generic) return 1; 558 #endif 559 } 560 return 0; 561 } 562 563 int fptr_whitelist_inplace_cb_query(inplace_cb_query_func_type* fptr) 564 { 565 #ifdef CLIENT_SUBNET 566 if(fptr == &ecs_whitelist_check) 567 return 1; 568 #endif 569 #ifdef WITH_PYTHONMODULE 570 if(fptr == &python_inplace_cb_query_generic) 571 return 1; 572 #endif 573 (void)fptr; 574 return 0; 575 } 576 577 int fptr_whitelist_inplace_cb_edns_back_parsed( 578 inplace_cb_edns_back_parsed_func_type* fptr) 579 { 580 #ifdef CLIENT_SUBNET 581 if(fptr == &ecs_edns_back_parsed) 582 return 1; 583 #else 584 (void)fptr; 585 #endif 586 return 0; 587 } 588 589 int fptr_whitelist_inplace_cb_query_response( 590 inplace_cb_query_response_func_type* fptr) 591 { 592 #ifdef CLIENT_SUBNET 593 if(fptr == &ecs_query_response) 594 return 1; 595 #else 596 (void)fptr; 597 #endif 598 return 0; 599 } 600