/*
* util/fptr_wlist.h - function pointer whitelists.
*
* Copyright (c) 2007, NLnet Labs. All rights reserved.
*
* This software is open source.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the NLNET LABS nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* \file
*
* This file contains functions that check function pointers.
* The functions contain a whitelist of known good callback values.
* Any other values lead to an error.
*
* This prevent heap overflow based exploits, where the callback pointer
* is overwritten by a buffer overflow (apart from this defense, buffer
* overflows should be fixed of course).
*
* Function pointers are used in
* o network code callbacks.
* o rbtree, lruhash, region data manipulation
* in lruhash, the assertions are before the critical regions.
* in other places, assertions are before the callback.
* o module operations.
*/
#ifndef UTIL_FPTR_WLIST_H
#define UTIL_FPTR_WLIST_H
#include "util/netevent.h"
#include "util/storage/lruhash.h"
#include "util/module.h"
#include "util/tube.h"
#include "services/mesh.h"
/**
* Macro to perform an assertion check for fptr wlist checks.
* Does not get disabled in optimize mode. Check adds security by layers.
*/
#if defined(EXPORT_ALL_SYMBOLS)
#define fptr_ok(x) /* nothing, dll-exe memory layout on win disables it */
#else
#define fptr_ok(x) \
do { if(!(x)) \
fatal_exit("%s:%d: %s: pointer whitelist %s failed", \
__FILE__, __LINE__, __func__, #x); \
} while(0);
#endif
/**
* Check function pointer whitelist for comm_point callback values.
*
* @param fptr: function pointer to check.
* @return false if not in whitelist.
*/
int fptr_whitelist_comm_point(comm_point_callback_t *fptr);
/**
* Check function pointer whitelist for raw comm_point callback values.
*
* @param fptr: function pointer to check.
* @return false if not in whitelist.
*/
int fptr_whitelist_comm_point_raw(comm_point_callback_t *fptr);
/**
* Check function pointer whitelist for comm_timer callback values.
*
* @param fptr: function pointer to check.
* @return false if not in whitelist.
*/
int fptr_whitelist_comm_timer(void (*fptr)(void*));
/**
* Check function pointer whitelist for comm_signal callback values.
*
* @param fptr: function pointer to check.
* @return false if not in whitelist.
*/
int fptr_whitelist_comm_signal(void (*fptr)(int, void*));
/**
* Check function pointer whitelist for start_accept callback values.
*
* @param fptr: function pointer to check.
* @return false if not in whitelist.
*/
int fptr_whitelist_start_accept(void (*fptr)(void*));
/**
* Check function pointer whitelist for stop_accept callback values.
*
* @param fptr: function pointer to check.
* @return false if not in whitelist.
*/
int fptr_whitelist_stop_accept(void (*fptr)(void*));
/**
* Check function pointer whitelist for event structure callback values.
* This is not called by libevent itself, but checked by netevent.
*
* @param fptr: function pointer to check.
* @return false if not in whitelist.
*/
int fptr_whitelist_event(void (*fptr)(int, short, void *));
/**
* Check function pointer whitelist for pending udp callback values.
*
* @param fptr: function pointer to check.
* @return false if not in whitelist.
*/
int fptr_whitelist_pending_udp(comm_point_callback_t *fptr);
/**
* Check function pointer whitelist for pending tcp callback values.
*
* @param fptr: function pointer to check.
* @return false if not in whitelist.
*/
int fptr_whitelist_pending_tcp(comm_point_callback_t *fptr);
/**
* Check function pointer whitelist for serviced query callback values.
*
* @param fptr: function pointer to check.
* @return false if not in whitelist.
*/
int fptr_whitelist_serviced_query(comm_point_callback_t *fptr);
/**
* Check function pointer whitelist for rbtree cmp callback values.
*
* @param fptr: function pointer to check.
* @return false if not in whitelist.
*/
int fptr_whitelist_rbtree_cmp(int (*fptr) (const void *, const void *));
/**
* Check function pointer whitelist for lruhash sizefunc callback values.
*
* @param fptr: function pointer to check.
* @return false if not in whitelist.
*/
int fptr_whitelist_hash_sizefunc(lruhash_sizefunc_t fptr);
/**
* Check function pointer whitelist for lruhash compfunc callback values.
*
* @param fptr: function pointer to check.
* @return false if not in whitelist.
*/
int fptr_whitelist_hash_compfunc(lruhash_compfunc_t fptr);
/**
* Check function pointer whitelist for lruhash delkeyfunc callback values.
*
* @param fptr: function pointer to check.
* @return false if not in whitelist.
*/
int fptr_whitelist_hash_delkeyfunc(lruhash_delkeyfunc_t fptr);
/**
* Check function pointer whitelist for lruhash deldata callback values.
*
* @param fptr: function pointer to check.
* @return false if not in whitelist.
*/
int fptr_whitelist_hash_deldatafunc(lruhash_deldatafunc_t fptr);
/**
* Check function pointer whitelist for lruhash markdel callback values.
*
* @param fptr: function pointer to check.
* @return false if not in whitelist.
*/
int fptr_whitelist_hash_markdelfunc(lruhash_markdelfunc_t fptr);
/**
* Check function pointer whitelist for module_env send_query callback values.
*
* @param fptr: function pointer to check.
* @return false if not in whitelist.
*/
int fptr_whitelist_modenv_send_query(struct outbound_entry* (*fptr)(
uint8_t* qname, size_t qnamelen, uint16_t qtype, uint16_t qclass,
uint16_t flags, int dnssec, int want_dnssec, int nocaps,
struct sockaddr_storage* addr, socklen_t addrlen,
uint8_t* zone, size_t zonelen,
struct module_qstate* q));
/**
* Check function pointer whitelist for module_env detach_subs callback values.
*
* @param fptr: function pointer to check.
* @return false if not in whitelist.
*/
int fptr_whitelist_modenv_detach_subs(void (*fptr)(
struct module_qstate* qstate));
/**
* Check function pointer whitelist for module_env attach_sub callback values.
*
* @param fptr: function pointer to check.
* @return false if not in whitelist.
*/
int fptr_whitelist_modenv_attach_sub(int (*fptr)(
struct module_qstate* qstate, struct query_info* qinfo,
uint16_t qflags, int prime, int valrec, struct module_qstate** newq));
/**
* Check function pointer whitelist for module_env kill_sub callback values.
*
* @param fptr: function pointer to check.
* @return false if not in whitelist.
*/
int fptr_whitelist_modenv_kill_sub(void (*fptr)(struct module_qstate* newq));
/**
* Check function pointer whitelist for module_env detect_cycle callback values.
*
* @param fptr: function pointer to check.
* @return false if not in whitelist.
*/
int fptr_whitelist_modenv_detect_cycle(int (*fptr)(
struct module_qstate* qstate, struct query_info* qinfo,
uint16_t flags, int prime, int valrec));
/**
* Check function pointer whitelist for module init call values.
*
* @param fptr: function pointer to check.
* @return false if not in whitelist.
*/
int fptr_whitelist_mod_init(int (*fptr)(struct module_env* env, int id));
/**
* Check function pointer whitelist for module deinit call values.
*
* @param fptr: function pointer to check.
* @return false if not in whitelist.
*/
int fptr_whitelist_mod_deinit(void (*fptr)(struct module_env* env, int id));
/**
* Check function pointer whitelist for module operate call values.
*
* @param fptr: function pointer to check.
* @return false if not in whitelist.
*/
int fptr_whitelist_mod_operate(void (*fptr)(struct module_qstate* qstate,
enum module_ev event, int id, struct outbound_entry* outbound));
/**
* Check function pointer whitelist for module inform_super call values.
*
* @param fptr: function pointer to check.
* @return false if not in whitelist.
*/
int fptr_whitelist_mod_inform_super(void (*fptr)(
struct module_qstate* qstate, int id, struct module_qstate* super));
/**
* Check function pointer whitelist for module clear call values.
*
* @param fptr: function pointer to check.
* @return false if not in whitelist.
*/
int fptr_whitelist_mod_clear(void (*fptr)(struct module_qstate* qstate,
int id));
/**
* Check function pointer whitelist for module get_mem call values.
*
* @param fptr: function pointer to check.
* @return false if not in whitelist.
*/
int fptr_whitelist_mod_get_mem(size_t (*fptr)(struct module_env* env, int id));
/**
* Check function pointer whitelist for alloc clear on id overflow call values.
*
* @param fptr: function pointer to check.
* @return false if not in whitelist.
*/
int fptr_whitelist_alloc_cleanup(void (*fptr)(void*));
/**
* Check function pointer whitelist for tube listen handler values.
*
* @param fptr: function pointer to check.
* @return false if not in whitelist.
*/
int fptr_whitelist_tube_listen(tube_callback_t* fptr);
/**
* Check function pointer whitelist for mesh state callback values.
*
* @param fptr: function pointer to check.
* @return false if not in whitelist.
*/
int fptr_whitelist_mesh_cb(mesh_cb_func_t fptr);
/**
* Check function pointer whitelist for config_get_option func values.
* @param fptr: function pointer to check.
* @return false if not in whitelist.
*/
int fptr_whitelist_print_func(void (*fptr)(char*,void*));
/** Due to module breakage by fptr wlist, these test app declarations
* are presented here */
/**
* compare two order_ids from lock-verify test app
* @param e1: first order_id
* @param e2: second order_id
* @return compare code -1, 0, +1 (like memcmp).
*/
int order_lock_cmp(const void* e1, const void* e2);
/**
* compare two codeline structs for rbtree from memstats test app
* @param a: codeline
* @param b: codeline
* @return compare code -1, 0, +1 (like memcmp).
*/
int codeline_cmp(const void* a, const void* b);
/** compare two replay_vars */
int replay_var_compare(const void* a, const void* b);
#endif /* UTIL_FPTR_WLIST_H */
