/usr/include/libknot/tsig-op.h is in libknot-dev 2.6.5-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 | /* Copyright (C) 2017 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*!
* \file
*
* \brief TSIG signing and validating.
*
* \addtogroup libknot
* @{
*/
#pragma once
#include <stdint.h>
#include "libknot/rrtype/tsig.h"
#include "libknot/rrset.h"
/*!
* \brief Generate TSIG signature of a message.
*
* This function generates TSIG digest of the given message prepended with the
* given Request MAC (if any) and appended with TSIG Variables. It also appends
* the resulting TSIG RR to the message wire format and accordingly adjusts
* the message size.
*
* \note This function does not save the new digest to the 'digest' parameter
* unless everything went OK. This allows sending the same buffer to
* the 'request_mac' and 'digest' parameters.
*
* \param msg Message to be signed.
* \param msg_len Size of the message in bytes.
* \param msg_max_len Maximum size of the message in bytes.
* \param request_mac Request MAC. (may be NULL).
* \param request_mac_len Size of the request MAC in bytes.
* \param digest Buffer to save the digest in.
* \param digest_len In: size of the buffer. Out: real size of the digest saved.
* \param key TSIG used for signing.
* \param tsig_rcode RCODE of the TSIG.
* \param request_time_signed Clients time signed.
*
* \retval KNOT_EOK if everything went OK.
* \retval TODO
*
* \todo This function should return TSIG errors by their codes which are
* positive values - this will be recognized by the caller.
*/
int knot_tsig_sign(uint8_t *msg, size_t *msg_len, size_t msg_max_len,
const uint8_t *request_mac, size_t request_mac_len,
uint8_t *digest, size_t *digest_len,
const knot_tsig_key_t *key, uint16_t tsig_rcode,
uint64_t request_time_signed);
/*!
* \brief Generate TSIG signature of a 2nd or later message in a TCP session.
*
* This function generates TSIG digest of the given message prepended with the
* given Request MAC (if any) and appended with TSIG Variables. It also appends
* the resulting TSIG RR to the message wire format and accordingly adjusts
* the message size.
*
* \note This function does not save the new digest to the 'digest' parameter
* unless everything went OK. This allows sending the same buffer to
* the 'request_mac' and 'digest' parameters.
*
* \param msg Message to be signed.
* \param msg_len Size of the message in bytes.
* \param msg_max_len Maximum size of the message in bytes.
* \param prev_digest Previous digest sent by the server in the session.
* \param prev_digest_len Size of the previous digest in bytes.
* \param digest Buffer to save the digest in.
* \param digest_len In: size of the buffer. Out: real size of the digest saved.
* \param key TSIG key for signing.
* \param to_sign Data being signed.
* \param to_sign_len Size of the data being signed.
*
* \retval KNOT_EOK if successful.
* \retval TODO
*
* \todo This function should return TSIG errors by their codes which are
* positive values - this will be recognized by the caller.
*/
int knot_tsig_sign_next(uint8_t *msg, size_t *msg_len, size_t msg_max_len,
const uint8_t *prev_digest, size_t prev_digest_len,
uint8_t *digest, size_t *digest_len,
const knot_tsig_key_t *key, uint8_t *to_sign,
size_t to_sign_len);
/*!
* \brief Checks incoming request.
*
* \param tsig_rr TSIG extracted from the packet.
* \param wire Wire format of the packet (including the TSIG RR).
* \param size Size of the wire format of packet in bytes.
* \param tsig_key TSIG key.
*
* \retval KNOT_EOK If the signature is valid.
* \retval TODO
*
* \todo This function should return TSIG errors by their codes which are
* positive values - this will be recognized by the caller.
*/
int knot_tsig_server_check(const knot_rrset_t *tsig_rr,
const uint8_t *wire, size_t size,
const knot_tsig_key_t *tsig_key);
/*!
* \brief Checks incoming response.
*
* \param tsig_rr TSIG extracted from the packet.
* \param wire Wire format of the packet (including the TSIG RR).
* \param size Size of the wire format of packet in bytes.
* \param request_mac Request MAC. (may be NULL).
* \param request_mac_len Size of the request MAC in bytes.
* \param key TSIG key.
* \param prev_time_signed Time for TSIG period validity.
*
* \retval KNOT_EOK If the signature is valid.
* \retval TODO
*
* \todo This function should return TSIG errors by their codes which are
* positive values - this will be recognized by the caller.
*/
int knot_tsig_client_check(const knot_rrset_t *tsig_rr,
const uint8_t *wire, size_t size,
const uint8_t *request_mac, size_t request_mac_len,
const knot_tsig_key_t *key,
uint64_t prev_time_signed);
/*!
* \brief Checks signature of 2nd or next packet in a TCP session.
*
* \param tsig_rr TSIG extracted from the packet.
* \param wire Wire format of the packet (including the TSIG RR).
* \param size Size of the wire format of packet in bytes.
* \param prev_digest Previous digest sent by the server in the session.
* \param prev_digest_len Size of the previous digest in bytes.
* \param key TSIG key.
* \param prev_time_signed Time for TSIG period validity.
*
* \retval KNOT_EOK If the signature is valid.
* \retval TODO
*
* \todo This function should return TSIG errors by their codes which are
* positive values - this will be recognized by the caller.
*/
int knot_tsig_client_check_next(const knot_rrset_t *tsig_rr,
const uint8_t *wire, size_t size,
const uint8_t *prev_digest,
size_t prev_digest_len,
const knot_tsig_key_t *key,
uint64_t prev_time_signed);
/*!
* \todo Documentation!
*/
int knot_tsig_add(uint8_t *msg, size_t *msg_len, size_t msg_max_len,
uint16_t tsig_rcode, const knot_rrset_t *tsig_rr);
/*! \brief Append TSIG RR to message.
* \todo Proper documentation.
*/
int knot_tsig_append(uint8_t *msg, size_t *msg_len, size_t msg_max_len,
const knot_rrset_t *tsig_rr);
/*! \brief Return true if the TSIG RCODE allows signing the packet.
* \todo Proper documentation.
*/
static inline bool knot_tsig_can_sign(uint16_t tsig_rcode) {
return tsig_rcode == KNOT_RCODE_NOERROR || tsig_rcode == KNOT_RCODE_BADTIME;
}
/*! @} */
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