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