unbound/util/fptr_wlist.h

   1 /*
   2  * util/fptr_wlist.h - 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  * This prevent heap overflow based exploits, where the callback pointer
  44  * is overwritten by a buffer overflow (apart from this defense, buffer
  45  * overflows should be fixed of course).
  46  *
  47  * Function pointers are used in
  48  *      o network code callbacks.
  49  *      o rbtree, lruhash, region data manipulation
  50  *              in lruhash, the assertions are before the critical regions.
  51  *              in other places, assertions are before the callback.
  52  *      o module operations.
  53  */
  54
  55 #ifndef UTIL_FPTR_WLIST_H
  56 #define UTIL_FPTR_WLIST_H
  57 #include "util/netevent.h"
  58 #include "util/storage/lruhash.h"
  59 #include "util/module.h"
  60 #include "util/tube.h"
  61 #include "services/mesh.h"
  62
  63 /**
  64  * Macro to perform an assertion check for fptr wlist checks.
  65  * Does not get disabled in optimize mode. Check adds security by layers.
  66  */
  67 #if defined(EXPORT_ALL_SYMBOLS)
  68 #define fptr_ok(x) /* nothing, dll-exe memory layout on win disables it */
  69 #else
  70 #define fptr_ok(x) \
  71         do { if(!(x)) \
  72                 fatal_exit("%s:%d: %s: pointer whitelist %s failed", \
  73                 __FILE__, __LINE__, __func__, #x); \
  74         } while(0);
  75 #endif
  76
  77 /**
  78  * Check function pointer whitelist for comm_point callback values.
  79  *
  80  * @param fptr: function pointer to check.
  81  * @return false if not in whitelist.
  82  */
  83 int fptr_whitelist_comm_point(comm_point_callback_t *fptr);
  84
  85 /**
  86  * Check function pointer whitelist for raw comm_point callback values.
  87  *
  88  * @param fptr: function pointer to check.
  89  * @return false if not in whitelist.
  90  */
  91 int fptr_whitelist_comm_point_raw(comm_point_callback_t *fptr);
  92
  93 /**
  94  * Check function pointer whitelist for comm_timer callback values.
  95  *
  96  * @param fptr: function pointer to check.
  97  * @return false if not in whitelist.
  98  */
  99 int fptr_whitelist_comm_timer(void (*fptr)(void*));
 100
 101 /**
 102  * Check function pointer whitelist for comm_signal callback values.
 103  *
 104  * @param fptr: function pointer to check.
 105  * @return false if not in whitelist.
 106  */
 107 int fptr_whitelist_comm_signal(void (*fptr)(int, void*));
 108
 109 /**
 110  * Check function pointer whitelist for start_accept callback values.
 111  *
 112  * @param fptr: function pointer to check.
 113  * @return false if not in whitelist.
 114  */
 115 int fptr_whitelist_start_accept(void (*fptr)(void*));
 116
 117 /**
 118  * Check function pointer whitelist for stop_accept callback values.
 119  *
 120  * @param fptr: function pointer to check.
 121  * @return false if not in whitelist.
 122  */
 123 int fptr_whitelist_stop_accept(void (*fptr)(void*));
 124
 125 /**
 126  * Check function pointer whitelist for event structure callback values.
 127  * This is not called by libevent itself, but checked by netevent.
 128  *
 129  * @param fptr: function pointer to check.
 130  * @return false if not in whitelist.
 131  */
 132 int fptr_whitelist_event(void (*fptr)(int, short, void *));
 133
 134 /**
 135  * Check function pointer whitelist for pending udp callback values.
 136  *
 137  * @param fptr: function pointer to check.
 138  * @return false if not in whitelist.
 139  */
 140 int fptr_whitelist_pending_udp(comm_point_callback_t *fptr);
 141
 142 /**
 143  * Check function pointer whitelist for pending tcp callback values.
 144  *
 145  * @param fptr: function pointer to check.
 146  * @return false if not in whitelist.
 147  */
 148 int fptr_whitelist_pending_tcp(comm_point_callback_t *fptr);
 149
 150 /**
 151  * Check function pointer whitelist for serviced query callback values.
 152  *
 153  * @param fptr: function pointer to check.
 154  * @return false if not in whitelist.
 155  */
 156 int fptr_whitelist_serviced_query(comm_point_callback_t *fptr);
 157
 158 /**
 159  * Check function pointer whitelist for rbtree cmp callback values.
 160  *
 161  * @param fptr: function pointer to check.
 162  * @return false if not in whitelist.
 163  */
 164 int fptr_whitelist_rbtree_cmp(int (*fptr) (const void *, const void *));
 165
 166 /**
 167  * Check function pointer whitelist for lruhash sizefunc callback values.
 168  *
 169  * @param fptr: function pointer to check.
 170  * @return false if not in whitelist.
 171  */
 172 int fptr_whitelist_hash_sizefunc(lruhash_sizefunc_t fptr);
 173
 174 /**
 175  * Check function pointer whitelist for lruhash compfunc callback values.
 176  *
 177  * @param fptr: function pointer to check.
 178  * @return false if not in whitelist.
 179  */
 180 int fptr_whitelist_hash_compfunc(lruhash_compfunc_t fptr);
 181
 182 /**
 183  * Check function pointer whitelist for lruhash delkeyfunc callback values.
 184  *
 185  * @param fptr: function pointer to check.
 186  * @return false if not in whitelist.
 187  */
 188 int fptr_whitelist_hash_delkeyfunc(lruhash_delkeyfunc_t fptr);
 189
 190 /**
 191  * Check function pointer whitelist for lruhash deldata callback values.
 192  *
 193  * @param fptr: function pointer to check.
 194  * @return false if not in whitelist.
 195  */
 196 int fptr_whitelist_hash_deldatafunc(lruhash_deldatafunc_t fptr);
 197
 198 /**
 199  * Check function pointer whitelist for lruhash markdel callback values.
 200  *
 201  * @param fptr: function pointer to check.
 202  * @return false if not in whitelist.
 203  */
 204 int fptr_whitelist_hash_markdelfunc(lruhash_markdelfunc_t fptr);
 205
 206 /**
 207  * Check function pointer whitelist for module_env send_query callback values.
 208  *
 209  * @param fptr: function pointer to check.
 210  * @return false if not in whitelist.
 211  */
 212 int fptr_whitelist_modenv_send_query(struct outbound_entry* (*fptr)(
 213         uint8_t* qname, size_t qnamelen, uint16_t qtype, uint16_t qclass,
 214         uint16_t flags, int dnssec, int want_dnssec, int nocaps,
 215         struct sockaddr_storage* addr, socklen_t addrlen,
 216         uint8_t* zone, size_t zonelen,
 217         struct module_qstate* q));
 218
 219 /**
 220  * Check function pointer whitelist for module_env detach_subs callback values.
 221  *
 222  * @param fptr: function pointer to check.
 223  * @return false if not in whitelist.
 224  */
 225 int fptr_whitelist_modenv_detach_subs(void (*fptr)(
 226         struct module_qstate* qstate));
 227
 228 /**
 229  * Check function pointer whitelist for module_env attach_sub callback values.
 230  *
 231  * @param fptr: function pointer to check.
 232  * @return false if not in whitelist.
 233  */
 234 int fptr_whitelist_modenv_attach_sub(int (*fptr)(
 235         struct module_qstate* qstate, struct query_info* qinfo,
 236         uint16_t qflags, int prime, int valrec, struct module_qstate** newq));
 237
 238 /**
 239  * Check function pointer whitelist for module_env kill_sub callback values.
 240  *
 241  * @param fptr: function pointer to check.
 242  * @return false if not in whitelist.
 243  */
 244 int fptr_whitelist_modenv_kill_sub(void (*fptr)(struct module_qstate* newq));
 245
 246 /**
 247  * Check function pointer whitelist for module_env detect_cycle callback values.
 248  *
 249  * @param fptr: function pointer to check.
 250  * @return false if not in whitelist.
 251  */
 252 int fptr_whitelist_modenv_detect_cycle(int (*fptr)(
 253         struct module_qstate* qstate, struct query_info* qinfo,
 254         uint16_t flags, int prime, int valrec));
 255
 256 /**
 257  * Check function pointer whitelist for module init call values.
 258  *
 259  * @param fptr: function pointer to check.
 260  * @return false if not in whitelist.
 261  */
 262 int fptr_whitelist_mod_init(int (*fptr)(struct module_env* env, int id));
 263
 264 /**
 265  * Check function pointer whitelist for module deinit call values.
 266  *
 267  * @param fptr: function pointer to check.
 268  * @return false if not in whitelist.
 269  */
 270 int fptr_whitelist_mod_deinit(void (*fptr)(struct module_env* env, int id));
 271
 272 /**
 273  * Check function pointer whitelist for module operate call values.
 274  *
 275  * @param fptr: function pointer to check.
 276  * @return false if not in whitelist.
 277  */
 278 int fptr_whitelist_mod_operate(void (*fptr)(struct module_qstate* qstate,
 279         enum module_ev event, int id, struct outbound_entry* outbound));
 280
 281 /**
 282  * Check function pointer whitelist for module inform_super call values.
 283  *
 284  * @param fptr: function pointer to check.
 285  * @return false if not in whitelist.
 286  */
 287 int fptr_whitelist_mod_inform_super(void (*fptr)(
 288         struct module_qstate* qstate, int id, struct module_qstate* super));
 289
 290 /**
 291  * Check function pointer whitelist for module clear call values.
 292  *
 293  * @param fptr: function pointer to check.
 294  * @return false if not in whitelist.
 295  */
 296 int fptr_whitelist_mod_clear(void (*fptr)(struct module_qstate* qstate,
 297         int id));
 298
 299 /**
 300  * Check function pointer whitelist for module get_mem call values.
 301  *
 302  * @param fptr: function pointer to check.
 303  * @return false if not in whitelist.
 304  */
 305 int fptr_whitelist_mod_get_mem(size_t (*fptr)(struct module_env* env, int id));
 306
 307 /**
 308  * Check function pointer whitelist for alloc clear on id overflow call values.
 309  *
 310  * @param fptr: function pointer to check.
 311  * @return false if not in whitelist.
 312  */
 313 int fptr_whitelist_alloc_cleanup(void (*fptr)(void*));
 314
 315 /**
 316  * Check function pointer whitelist for tube listen handler values.
 317  *
 318  * @param fptr: function pointer to check.
 319  * @return false if not in whitelist.
 320  */
 321 int fptr_whitelist_tube_listen(tube_callback_t* fptr);
 322
 323 /**
 324  * Check function pointer whitelist for mesh state callback values.
 325  *
 326  * @param fptr: function pointer to check.
 327  * @return false if not in whitelist.
 328  */
 329 int fptr_whitelist_mesh_cb(mesh_cb_func_t fptr);
 330
 331 /**
 332  * Check function pointer whitelist for config_get_option func values.
 333  * @param fptr: function pointer to check.
 334  * @return false if not in whitelist.
 335  */
 336 int fptr_whitelist_print_func(void (*fptr)(char*,void*));
 337
 338 /** Due to module breakage by fptr wlist, these test app declarations
 339  * are presented here */
 340 /**
 341  * compare two order_ids from lock-verify test app
 342  * @param e1: first order_id
 343  * @param e2: second order_id
 344  * @return compare code -1, 0, +1 (like memcmp).
 345  */
 346 int order_lock_cmp(const void* e1, const void* e2);
 347
 348 /**
 349  * compare two codeline structs for rbtree from memstats test app
 350  * @param a: codeline
 351  * @param b: codeline
 352  * @return compare code -1, 0, +1 (like memcmp).
 353  */
 354 int codeline_cmp(const void* a, const void* b);
 355
 356 /** compare two replay_vars */
 357 int replay_var_compare(const void* a, const void* b);
 358
 359 #endif /* UTIL_FPTR_WLIST_H */