/usr/include/dnscore/tsig.h is in libyadifa-dev 2.1.6-1.
This file is owned by root:root, with mode 0o644.
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*
* Copyright (c) 2011-2016, EURid. All rights reserved.
* The YADIFA TM software product is provided under the BSD 3-clause license:
*
* 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 EURid 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.
*
*------------------------------------------------------------------------------
*
*/
/** @defgroup ### #######
* @ingroup dnscore
* @brief
*
* @{
*/
#ifndef TSIG_H_
#define TSIG_H_
#include <stdio.h>
#include <stdlib.h>
#include <dnscore/sys_types.h>
#include <openssl/hmac.h>
#include <dnscore/packet_reader.h>
#define HMAC_UNKNOWN 0
#define HMAC_MD5 157
#define HMAC_SHA1 161
#define HMAC_SHA224 162
#define HMAC_SHA256 163
#define HMAC_SHA384 164
#define HMAC_SHA512 165
#if DNSCORE_HAS_TSIG_SUPPORT
#ifdef __cplusplus
extern "C"
{
#endif
/*
*
*/
/*
* A digest is stored prefixed with its length ([1;255])
*/
/*
* A structure to hold both children with direct access
*/
typedef struct tsig_node tsig_node;
struct tsig_children
{
struct tsig_node* left;
struct tsig_node* right;
};
/*
* An union to have access to the children with direct or indexed access
*/
typedef union tsig_children_union tsig_children_union;
union tsig_children_union
{
struct tsig_children lr;
struct tsig_node * child[2];
};
typedef struct tsig_item tsig_item;
struct tsig_item
{
const u8 *name;
const u8 *mac;
const u8 *mac_algorithm_name;
const EVP_MD *evp_md;
u16 name_len;
u16 mac_algorithm_name_len;
u16 mac_size;
u8 mac_algorithm;
u8 load_serial;
};
/*
* The node structure CANNOT have a varying size on a given collection
* This means that the digest size is a constant in the whole tree
*/
struct tsig_node
{
union tsig_children_union children;
tsig_item item;
s8 balance;
};
/**
* Call this before a config reload
*/
void tsig_serial_next();
/*
* I recommand setting a define to identify the C part of the template
* So it can be used to undefine what is not required anymore for every
* C file but that one.
*
*/
ya_result tsig_register(const u8 *name, const u8 *mac, u16 mac_size, u8 mac_algorithm);
void tsig_finalize();
tsig_item *tsig_get(const u8 *name);
u32 tsig_get_count();
tsig_item *tsig_get_at_index(s32 index);
struct message_data;
typedef enum
{
TSIG_NOWHERE = -1,
TSIG_START = 0,
TSIG_MIDDLE = 1,
TSIG_END = 2,
TSIG_WHOLE = 3
} tsig_tcp_message_position;
/**
* Sign the first message_data of a tcp answer
*/
ya_result tsig_sign_tcp_first_message(struct message_data *mesg);
/**
* Sign one of the "middle" message_data of a tcp answer
*/
ya_result tsig_sign_tcp_next_message(struct message_data *mesg);
/**
* Sign the 100*Nth last message_data of a tcp answer
*/
ya_result tsig_sign_tcp_last_message(struct message_data *mesg);
/**
* Calls the relevant sign tcp function
*/
ya_result tsig_sign_tcp_message(struct message_data *mesg, tsig_tcp_message_position pos);
/**
* Sign the first message_data of a tcp answer
*/
ya_result tsig_sign_tcp_first_message(struct message_data *mesg);
/**
* Sign one of the "middle" message_data of a tcp answer
*/
ya_result tsig_sign_tcp_next_message(struct message_data *mesg);
/**
* Sign the 100*Nth last message_data of a tcp answer
*/
ya_result tsig_sign_tcp_last_message(struct message_data *mesg);
/**
* Calls the relevant verify tcp function
*/
ya_result tsig_verify_tcp_first_message(struct message_data *mesg, const u8 *mac, u16 mac_size);
ya_result tsig_verify_tcp_next_message(struct message_data *mesg);
void tsig_verify_tcp_last_message(struct message_data *mesg);
void tsig_register_algorithms();
const EVP_MD *tsig_get_EVP_MD(u8 algorithm);
u8 tsig_get_algorithm(const u8 *name);
const u8* tsig_get_algorithm_name(u8 algorithm);
/*
* Called by tsig_extract_and_process
* Processes the TSIG of the message, remove the TSIG from the message
* *mesg the message
* *purd the packet reader pointing to be start of the RDATA of the TSIG
* tsigname the dname of the TSIG
* tctr the TYPE-CLASS-TTL-RDATALEN of the TSIG
*/
// no verification whatsoever, use with care
ya_result tsig_process(struct message_data *mesg, packet_unpack_reader_data *purd, u32 tsig_offset, const tsig_item *tsig, struct type_class_ttl_rdlen *tctr);
ya_result tsig_process_query(struct message_data *mesg, packet_unpack_reader_data *purd, u32 tsig_offset, u8 tsigname[MAX_DOMAIN_LENGTH], struct type_class_ttl_rdlen *tctr);
ya_result tsig_process_answer(struct message_data *mesg, packet_unpack_reader_data *purd, u32 tsig_offset, const tsig_item *tsig, struct type_class_ttl_rdlen *tctr, const u8 *mac, u16 mac_size);
/*
* Search for the last
*
*/
ya_result tsig_extract_and_process(struct message_data *mesg);
/**
* signs the message
* the tsig.tsig should be set
* the tsig fields must be set
*
*/
ya_result tsig_sign_answer(struct message_data *mesg);
/**
* signs the message
* the tsig.tsig should be set
* the tsig fields should be clear
*
*/
ya_result tsig_sign_query(struct message_data *mesg);
ya_result tsig_verify_answer(struct message_data *mesg, const u8 *mac, u16 mac_size);
ya_result tsig_append_unsigned_error(struct message_data *mesg);
ya_result tsig_append_error(struct message_data *mesg);
/**
* Removes the TSIG if any, setups the tsig fields of the message.
*
* Returns 1 if a TSIG has been processed.
* Returns 0 if none were found.
*/
ya_result tsig_message_extract(struct message_data *mesg);
#define TSIG_ENABLED(message__) ((message__)->tsig.tsig != NULL)
#ifdef __cplusplus
}
#endif
#endif /* TSIG support */
#endif /* TSIG_H_ */
/** @} */
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