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/cache/infra.h" 53 #include "services/cache/rrset.h" 54 #include "iterator/iterator.h" 55 #include "iterator/iter_fwd.h" 56 #include "validator/validator.h" 57 #include "validator/val_anchor.h" 58 #include "validator/val_nsec3.h" 59 #include "validator/val_sigcrypt.h" 60 #include "validator/val_kentry.h" 61 #include "validator/val_neg.h" 62 #include "validator/autotrust.h" 63 #include "util/data/msgreply.h" 64 #include "util/data/packed_rrset.h" 65 #include "util/storage/slabhash.h" 66 #include "util/storage/dnstree.h" 67 #include "util/locks.h" 68 #include "libunbound/libworker.h" 69 #include "libunbound/context.h" 70 #include "libunbound/worker.h" 71 #include "util/tube.h" 72 #include "util/config_file.h" 73 #ifdef UB_ON_WINDOWS 74 #include "winrc/win_svc.h" 75 #endif 76 77 #ifdef WITH_PYTHONMODULE 78 #include "pythonmod/pythonmod.h" 79 #endif 80 81 int 82 fptr_whitelist_comm_point(comm_point_callback_t *fptr) 83 { 84 if(fptr == &worker_handle_request) return 1; 85 else if(fptr == &outnet_udp_cb) return 1; 86 else if(fptr == &outnet_tcp_cb) return 1; 87 else if(fptr == &tube_handle_listen) return 1; 88 return 0; 89 } 90 91 int 92 fptr_whitelist_comm_point_raw(comm_point_callback_t *fptr) 93 { 94 if(fptr == &tube_handle_listen) return 1; 95 else if(fptr == &tube_handle_write) return 1; 96 else if(fptr == &remote_accept_callback) return 1; 97 else if(fptr == &remote_control_callback) return 1; 98 return 0; 99 } 100 101 int 102 fptr_whitelist_comm_timer(void (*fptr)(void*)) 103 { 104 if(fptr == &pending_udp_timer_cb) return 1; 105 else if(fptr == &outnet_tcptimer) return 1; 106 else if(fptr == &pending_udp_timer_delay_cb) return 1; 107 else if(fptr == &worker_stat_timer_cb) return 1; 108 else if(fptr == &worker_probe_timer_cb) return 1; 109 #ifdef UB_ON_WINDOWS 110 else if(fptr == &wsvc_cron_cb) return 1; 111 #endif 112 return 0; 113 } 114 115 int 116 fptr_whitelist_comm_signal(void (*fptr)(int, void*)) 117 { 118 if(fptr == &worker_sighandler) return 1; 119 return 0; 120 } 121 122 int fptr_whitelist_start_accept(void (*fptr)(void*)) 123 { 124 if(fptr == &worker_start_accept) return 1; 125 return 0; 126 } 127 128 int fptr_whitelist_stop_accept(void (*fptr)(void*)) 129 { 130 if(fptr == &worker_stop_accept) return 1; 131 return 0; 132 } 133 134 int 135 fptr_whitelist_event(void (*fptr)(int, short, void *)) 136 { 137 if(fptr == &comm_point_udp_callback) return 1; 138 else if(fptr == &comm_point_udp_ancil_callback) return 1; 139 else if(fptr == &comm_point_tcp_accept_callback) return 1; 140 else if(fptr == &comm_point_tcp_handle_callback) return 1; 141 else if(fptr == &comm_timer_callback) return 1; 142 else if(fptr == &comm_signal_callback) return 1; 143 else if(fptr == &comm_point_local_handle_callback) return 1; 144 else if(fptr == &comm_point_raw_handle_callback) return 1; 145 else if(fptr == &tube_handle_signal) return 1; 146 else if(fptr == &comm_base_handle_slow_accept) return 1; 147 #ifdef UB_ON_WINDOWS 148 else if(fptr == &worker_win_stop_cb) return 1; 149 #endif 150 return 0; 151 } 152 153 int 154 fptr_whitelist_pending_udp(comm_point_callback_t *fptr) 155 { 156 if(fptr == &serviced_udp_callback) return 1; 157 else if(fptr == &worker_handle_reply) return 1; 158 else if(fptr == &libworker_handle_reply) return 1; 159 return 0; 160 } 161 162 int 163 fptr_whitelist_pending_tcp(comm_point_callback_t *fptr) 164 { 165 if(fptr == &serviced_tcp_callback) return 1; 166 else if(fptr == &worker_handle_reply) return 1; 167 else if(fptr == &libworker_handle_reply) return 1; 168 return 0; 169 } 170 171 int 172 fptr_whitelist_serviced_query(comm_point_callback_t *fptr) 173 { 174 if(fptr == &worker_handle_service_reply) return 1; 175 else if(fptr == &libworker_handle_service_reply) return 1; 176 return 0; 177 } 178 179 int 180 fptr_whitelist_rbtree_cmp(int (*fptr) (const void *, const void *)) 181 { 182 if(fptr == &mesh_state_compare) return 1; 183 else if(fptr == &mesh_state_ref_compare) return 1; 184 else if(fptr == &addr_tree_compare) return 1; 185 else if(fptr == &local_zone_cmp) return 1; 186 else if(fptr == &local_data_cmp) return 1; 187 else if(fptr == &fwd_cmp) return 1; 188 else if(fptr == &pending_cmp) return 1; 189 else if(fptr == &serviced_cmp) return 1; 190 else if(fptr == &name_tree_compare) return 1; 191 else if(fptr == &order_lock_cmp) return 1; 192 else if(fptr == &codeline_cmp) return 1; 193 else if(fptr == &nsec3_hash_cmp) return 1; 194 else if(fptr == &mini_ev_cmp) return 1; 195 else if(fptr == &anchor_cmp) return 1; 196 else if(fptr == &canonical_tree_compare) return 1; 197 else if(fptr == &context_query_cmp) return 1; 198 else if(fptr == &val_neg_data_compare) return 1; 199 else if(fptr == &val_neg_zone_compare) return 1; 200 else if(fptr == &probetree_cmp) return 1; 201 else if(fptr == &replay_var_compare) return 1; 202 return 0; 203 } 204 205 int 206 fptr_whitelist_hash_sizefunc(lruhash_sizefunc_t fptr) 207 { 208 if(fptr == &msgreply_sizefunc) return 1; 209 else if(fptr == &ub_rrset_sizefunc) return 1; 210 else if(fptr == &infra_sizefunc) return 1; 211 else if(fptr == &key_entry_sizefunc) return 1; 212 else if(fptr == &test_slabhash_sizefunc) return 1; 213 return 0; 214 } 215 216 int 217 fptr_whitelist_hash_compfunc(lruhash_compfunc_t fptr) 218 { 219 if(fptr == &query_info_compare) return 1; 220 else if(fptr == &ub_rrset_compare) return 1; 221 else if(fptr == &infra_compfunc) return 1; 222 else if(fptr == &key_entry_compfunc) return 1; 223 else if(fptr == &test_slabhash_compfunc) return 1; 224 return 0; 225 } 226 227 int 228 fptr_whitelist_hash_delkeyfunc(lruhash_delkeyfunc_t fptr) 229 { 230 if(fptr == &query_entry_delete) return 1; 231 else if(fptr == &ub_rrset_key_delete) return 1; 232 else if(fptr == &infra_delkeyfunc) return 1; 233 else if(fptr == &key_entry_delkeyfunc) return 1; 234 else if(fptr == &test_slabhash_delkey) return 1; 235 return 0; 236 } 237 238 int 239 fptr_whitelist_hash_deldatafunc(lruhash_deldatafunc_t fptr) 240 { 241 if(fptr == &reply_info_delete) return 1; 242 else if(fptr == &rrset_data_delete) return 1; 243 else if(fptr == &infra_deldatafunc) return 1; 244 else if(fptr == &key_entry_deldatafunc) return 1; 245 else if(fptr == &test_slabhash_deldata) return 1; 246 return 0; 247 } 248 249 int 250 fptr_whitelist_hash_markdelfunc(lruhash_markdelfunc_t fptr) 251 { 252 if(fptr == NULL) return 1; 253 else if(fptr == &rrset_markdel) return 1; 254 return 0; 255 } 256 257 /** whitelist env->send_query callbacks */ 258 int 259 fptr_whitelist_modenv_send_query(struct outbound_entry* (*fptr)( 260 uint8_t* qname, size_t qnamelen, uint16_t qtype, uint16_t qclass, 261 uint16_t flags, int dnssec, int want_dnssec, 262 struct sockaddr_storage* addr, socklen_t addrlen, 263 uint8_t* zone, size_t zonelen, 264 struct module_qstate* q)) 265 { 266 if(fptr == &worker_send_query) return 1; 267 else if(fptr == &libworker_send_query) return 1; 268 return 0; 269 } 270 271 int 272 fptr_whitelist_modenv_detach_subs(void (*fptr)( 273 struct module_qstate* qstate)) 274 { 275 if(fptr == &mesh_detach_subs) return 1; 276 return 0; 277 } 278 279 int 280 fptr_whitelist_modenv_attach_sub(int (*fptr)( 281 struct module_qstate* qstate, struct query_info* qinfo, 282 uint16_t qflags, int prime, struct module_qstate** newq)) 283 { 284 if(fptr == &mesh_attach_sub) return 1; 285 return 0; 286 } 287 288 int 289 fptr_whitelist_modenv_kill_sub(void (*fptr)(struct module_qstate* newq)) 290 { 291 if(fptr == &mesh_state_delete) return 1; 292 return 0; 293 } 294 295 int 296 fptr_whitelist_modenv_detect_cycle(int (*fptr)( 297 struct module_qstate* qstate, struct query_info* qinfo, 298 uint16_t flags, int prime)) 299 { 300 if(fptr == &mesh_detect_cycle) return 1; 301 return 0; 302 } 303 304 int 305 fptr_whitelist_mod_init(int (*fptr)(struct module_env* env, int id)) 306 { 307 if(fptr == &iter_init) return 1; 308 else if(fptr == &val_init) return 1; 309 #ifdef WITH_PYTHONMODULE 310 else if(fptr == &pythonmod_init) return 1; 311 #endif 312 return 0; 313 } 314 315 int 316 fptr_whitelist_mod_deinit(void (*fptr)(struct module_env* env, int id)) 317 { 318 if(fptr == &iter_deinit) return 1; 319 else if(fptr == &val_deinit) return 1; 320 #ifdef WITH_PYTHONMODULE 321 else if(fptr == &pythonmod_deinit) return 1; 322 #endif 323 return 0; 324 } 325 326 int 327 fptr_whitelist_mod_operate(void (*fptr)(struct module_qstate* qstate, 328 enum module_ev event, int id, struct outbound_entry* outbound)) 329 { 330 if(fptr == &iter_operate) return 1; 331 else if(fptr == &val_operate) return 1; 332 #ifdef WITH_PYTHONMODULE 333 else if(fptr == &pythonmod_operate) return 1; 334 #endif 335 return 0; 336 } 337 338 int 339 fptr_whitelist_mod_inform_super(void (*fptr)( 340 struct module_qstate* qstate, int id, struct module_qstate* super)) 341 { 342 if(fptr == &iter_inform_super) return 1; 343 else if(fptr == &val_inform_super) return 1; 344 #ifdef WITH_PYTHONMODULE 345 else if(fptr == &pythonmod_inform_super) return 1; 346 #endif 347 return 0; 348 } 349 350 int 351 fptr_whitelist_mod_clear(void (*fptr)(struct module_qstate* qstate, 352 int id)) 353 { 354 if(fptr == &iter_clear) return 1; 355 else if(fptr == &val_clear) return 1; 356 #ifdef WITH_PYTHONMODULE 357 else if(fptr == &pythonmod_clear) return 1; 358 #endif 359 return 0; 360 } 361 362 int 363 fptr_whitelist_mod_get_mem(size_t (*fptr)(struct module_env* env, int id)) 364 { 365 if(fptr == &iter_get_mem) return 1; 366 else if(fptr == &val_get_mem) return 1; 367 #ifdef WITH_PYTHONMODULE 368 else if(fptr == &pythonmod_get_mem) return 1; 369 #endif 370 return 0; 371 } 372 373 int 374 fptr_whitelist_alloc_cleanup(void (*fptr)(void*)) 375 { 376 if(fptr == &worker_alloc_cleanup) return 1; 377 return 0; 378 } 379 380 int fptr_whitelist_tube_listen(tube_callback_t* fptr) 381 { 382 if(fptr == &worker_handle_control_cmd) return 1; 383 else if(fptr == &libworker_handle_control_cmd) return 1; 384 return 0; 385 } 386 387 int fptr_whitelist_mesh_cb(mesh_cb_func_t fptr) 388 { 389 if(fptr == &libworker_fg_done_cb) return 1; 390 else if(fptr == &libworker_bg_done_cb) return 1; 391 else if(fptr == &libworker_event_done_cb) return 1; 392 else if(fptr == &probe_answer_cb) return 1; 393 return 0; 394 } 395 396 int fptr_whitelist_print_func(void (*fptr)(char*,void*)) 397 { 398 if(fptr == &config_print_func) return 1; 399 else if(fptr == &config_collate_func) return 1; 400 else if(fptr == &remote_get_opt_ssl) return 1; 401 return 0; 402 } 403