142 lines
4.2 KiB
C
142 lines
4.2 KiB
C
/*
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* Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "inner.h"
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static int
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se_choose(const br_ssl_server_policy_class **pctx,
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const br_ssl_server_context *cc,
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br_ssl_server_choices *choices)
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{
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br_ssl_server_policy_ec_context *pc;
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const br_suite_translated *st;
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size_t u, st_num;
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unsigned hash_id;
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pc = (br_ssl_server_policy_ec_context *)pctx;
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st = br_ssl_server_get_client_suites(cc, &st_num);
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hash_id = br_ssl_choose_hash(br_ssl_server_get_client_hashes(cc) >> 8);
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if (cc->eng.session.version < BR_TLS12) {
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hash_id = br_sha1_ID;
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}
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choices->chain = pc->chain;
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choices->chain_len = pc->chain_len;
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for (u = 0; u < st_num; u ++) {
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unsigned tt;
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tt = st[u][1];
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switch (tt >> 12) {
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case BR_SSLKEYX_ECDH_RSA:
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if ((pc->allowed_usages & BR_KEYTYPE_KEYX) != 0
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&& pc->cert_issuer_key_type == BR_KEYTYPE_RSA)
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{
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choices->cipher_suite = st[u][0];
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return 1;
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}
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break;
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case BR_SSLKEYX_ECDH_ECDSA:
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if ((pc->allowed_usages & BR_KEYTYPE_KEYX) != 0
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&& pc->cert_issuer_key_type == BR_KEYTYPE_EC)
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{
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choices->cipher_suite = st[u][0];
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return 1;
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}
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break;
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case BR_SSLKEYX_ECDHE_ECDSA:
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if ((pc->allowed_usages & BR_KEYTYPE_SIGN) != 0
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&& hash_id != 0)
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{
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choices->cipher_suite = st[u][0];
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choices->algo_id = hash_id + 0xFF00;
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return 1;
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}
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break;
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}
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}
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return 0;
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}
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static uint32_t
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se_do_keyx(const br_ssl_server_policy_class **pctx,
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unsigned char *data, size_t *len)
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{
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br_ssl_server_policy_ec_context *pc;
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uint32_t r;
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size_t xoff, xlen;
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pc = (br_ssl_server_policy_ec_context *)pctx;
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r = pc->iec->mul(data, *len, pc->sk->x, pc->sk->xlen, pc->sk->curve);
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xoff = pc->iec->xoff(pc->sk->curve, &xlen);
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memmove(data, data + xoff, xlen);
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*len = xlen;
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return r;
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}
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static size_t
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se_do_sign(const br_ssl_server_policy_class **pctx,
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unsigned algo_id, unsigned char *data, size_t hv_len, size_t len)
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{
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br_ssl_server_policy_ec_context *pc;
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unsigned char hv[64];
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const br_hash_class *hc;
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algo_id &= 0xFF;
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pc = (br_ssl_server_policy_ec_context *)pctx;
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hc = br_multihash_getimpl(pc->mhash, algo_id);
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if (hc == NULL) {
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return 0;
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}
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memcpy(hv, data, hv_len);
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if (len < 139) {
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return 0;
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}
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return pc->iecdsa(pc->iec, hc, hv, pc->sk, data);
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}
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static const br_ssl_server_policy_class se_policy_vtable = {
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sizeof(br_ssl_server_policy_ec_context),
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se_choose,
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se_do_keyx,
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se_do_sign
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};
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/* see bearssl_ssl.h */
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void
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br_ssl_server_set_single_ec(br_ssl_server_context *cc,
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const br_x509_certificate *chain, size_t chain_len,
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const br_ec_private_key *sk, unsigned allowed_usages,
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unsigned cert_issuer_key_type,
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const br_ec_impl *iec, br_ecdsa_sign iecdsa)
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{
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cc->chain_handler.single_ec.vtable = &se_policy_vtable;
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cc->chain_handler.single_ec.chain = chain;
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cc->chain_handler.single_ec.chain_len = chain_len;
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cc->chain_handler.single_ec.sk = sk;
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cc->chain_handler.single_ec.allowed_usages = allowed_usages;
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cc->chain_handler.single_ec.cert_issuer_key_type = cert_issuer_key_type;
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cc->chain_handler.single_ec.mhash = &cc->eng.mhash;
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cc->chain_handler.single_ec.iec = iec;
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cc->chain_handler.single_ec.iecdsa = iecdsa;
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cc->policy_vtable = &cc->chain_handler.single_ec.vtable;
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}
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