36441fabde
gnutls running in the FIPS140-2 mode does not allow MD5 to be initialized, which breaks chronyd using MD5 to calculate reference ID of IPv6 addresses. Specify a new hash algorithm for non-security MD5 use and temporarily switch to the lax mode when initializing the hash function.
145 lines
3.5 KiB
C
145 lines
3.5 KiB
C
/*
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chronyd/chronyc - Programs for keeping computer clocks accurate.
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**********************************************************************
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* Copyright (C) Miroslav Lichvar 2021
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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**********************************************************************
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=======================================================================
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Crypto hashing using the GnuTLS library
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*/
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#include "config.h"
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#include "sysincl.h"
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#include <gnutls/crypto.h>
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#include "hash.h"
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#include "logging.h"
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struct hash {
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const HSH_Algorithm algorithm;
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const gnutls_digest_algorithm_t type;
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gnutls_hash_hd_t handle;
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};
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static struct hash hashes[] = {
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{ HSH_MD5_NONCRYPTO, GNUTLS_DIG_MD5, NULL },
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{ HSH_MD5, GNUTLS_DIG_MD5, NULL },
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{ HSH_SHA1, GNUTLS_DIG_SHA1, NULL },
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{ HSH_SHA256, GNUTLS_DIG_SHA256, NULL },
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{ HSH_SHA384, GNUTLS_DIG_SHA384, NULL },
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{ HSH_SHA512, GNUTLS_DIG_SHA512, NULL },
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{ HSH_SHA3_224, GNUTLS_DIG_SHA3_224, NULL },
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{ HSH_SHA3_256, GNUTLS_DIG_SHA3_256, NULL },
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{ HSH_SHA3_384, GNUTLS_DIG_SHA3_384, NULL },
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{ HSH_SHA3_512, GNUTLS_DIG_SHA3_512, NULL },
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{ 0, 0, NULL }
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};
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static int gnutls_initialised = 0;
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int
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HSH_GetHashId(HSH_Algorithm algorithm)
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{
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int id, r;
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if (!gnutls_initialised) {
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r = gnutls_global_init();
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if (r < 0)
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LOG_FATAL("Could not initialise %s : %s", "gnutls", gnutls_strerror(r));
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gnutls_initialised = 1;
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}
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for (id = 0; hashes[id].algorithm != 0; id++) {
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if (hashes[id].algorithm == algorithm)
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break;
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}
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if (hashes[id].algorithm == 0)
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return -1;
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if (hashes[id].handle)
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return id;
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if (algorithm == HSH_MD5_NONCRYPTO)
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GNUTLS_FIPS140_SET_LAX_MODE();
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r = gnutls_hash_init(&hashes[id].handle, hashes[id].type);
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if (algorithm == HSH_MD5_NONCRYPTO)
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GNUTLS_FIPS140_SET_STRICT_MODE();
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if (r < 0) {
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DEBUG_LOG("Could not initialise %s : %s", "hash", gnutls_strerror(r));
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hashes[id].handle = NULL;
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return -1;
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}
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return id;
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}
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int
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HSH_Hash(int id, const void *in1, int in1_len, const void *in2, int in2_len,
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unsigned char *out, int out_len)
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{
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unsigned char buf[MAX_HASH_LENGTH];
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gnutls_hash_hd_t handle;
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int hash_len;
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if (in1_len < 0 || in2_len < 0 || out_len < 0)
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return 0;
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handle = hashes[id].handle;
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hash_len = gnutls_hash_get_len(hashes[id].type);
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if (out_len > hash_len)
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out_len = hash_len;
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if (hash_len > sizeof (buf))
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return 0;
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if (gnutls_hash(handle, in1, in1_len) < 0 ||
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(in2 && gnutls_hash(handle, in2, in2_len) < 0)) {
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/* Reset the state */
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gnutls_hash_output(handle, buf);
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return 0;
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}
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gnutls_hash_output(handle, buf);
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memcpy(out, buf, out_len);
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return out_len;
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}
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void
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HSH_Finalise(void)
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{
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int i;
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if (!gnutls_initialised)
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return;
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for (i = 0; hashes[i].algorithm != 0; i++) {
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if (hashes[i].handle)
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gnutls_hash_deinit(hashes[i].handle, NULL);
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}
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gnutls_global_deinit();
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}
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