1 /*
2 * Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining
5 * a copy of this software and associated documentation files (the
6 * "Software"), to deal in the Software without restriction, including
7 * without limitation the rights to use, copy, modify, merge, publish,
8 * distribute, sublicense, and/or sell copies of the Software, and to
9 * permit persons to whom the Software is furnished to do so, subject to
10 * the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be
13 * included in all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
19 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
20 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
21 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
22 * SOFTWARE.
23 */
24
25 #include "inner.h"
26
27 static int
sr_choose(const br_ssl_server_policy_class ** pctx,const br_ssl_server_context * cc,br_ssl_server_choices * choices)28 sr_choose(const br_ssl_server_policy_class **pctx,
29 const br_ssl_server_context *cc,
30 br_ssl_server_choices *choices)
31 {
32 br_ssl_server_policy_rsa_context *pc;
33 const br_suite_translated *st;
34 size_t u, st_num;
35 unsigned hash_id;
36 int fh;
37
38 pc = (br_ssl_server_policy_rsa_context *)pctx;
39 st = br_ssl_server_get_client_suites(cc, &st_num);
40 if (cc->eng.session.version < BR_TLS12) {
41 hash_id = 0;
42 fh = 1;
43 } else {
44 hash_id = br_ssl_choose_hash(
45 br_ssl_server_get_client_hashes(cc));
46 fh = (hash_id != 0);
47 }
48 choices->chain = pc->chain;
49 choices->chain_len = pc->chain_len;
50 for (u = 0; u < st_num; u ++) {
51 unsigned tt;
52
53 tt = st[u][1];
54 switch (tt >> 12) {
55 case BR_SSLKEYX_RSA:
56 if ((pc->allowed_usages & BR_KEYTYPE_KEYX) != 0) {
57 choices->cipher_suite = st[u][0];
58 return 1;
59 }
60 break;
61 case BR_SSLKEYX_ECDHE_RSA:
62 if ((pc->allowed_usages & BR_KEYTYPE_SIGN) != 0 && fh) {
63 choices->cipher_suite = st[u][0];
64 choices->algo_id = hash_id + 0xFF00;
65 return 1;
66 }
67 break;
68 }
69 }
70 return 0;
71 }
72
73 static uint32_t
sr_do_keyx(const br_ssl_server_policy_class ** pctx,unsigned char * data,size_t * len)74 sr_do_keyx(const br_ssl_server_policy_class **pctx,
75 unsigned char *data, size_t *len)
76 {
77 br_ssl_server_policy_rsa_context *pc;
78
79 pc = (br_ssl_server_policy_rsa_context *)pctx;
80 return br_rsa_ssl_decrypt(pc->irsacore, pc->sk, data, *len);
81 }
82
83 /*
84 * OID for hash functions in RSA signatures.
85 */
86 static const unsigned char HASH_OID_SHA1[] = {
87 0x05, 0x2B, 0x0E, 0x03, 0x02, 0x1A
88 };
89
90 static const unsigned char HASH_OID_SHA224[] = {
91 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x04
92 };
93
94 static const unsigned char HASH_OID_SHA256[] = {
95 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01
96 };
97
98 static const unsigned char HASH_OID_SHA384[] = {
99 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x02
100 };
101
102 static const unsigned char HASH_OID_SHA512[] = {
103 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03
104 };
105
106 static const unsigned char *HASH_OID[] = {
107 HASH_OID_SHA1,
108 HASH_OID_SHA224,
109 HASH_OID_SHA256,
110 HASH_OID_SHA384,
111 HASH_OID_SHA512
112 };
113
114 static size_t
sr_do_sign(const br_ssl_server_policy_class ** pctx,unsigned algo_id,unsigned char * data,size_t hv_len,size_t len)115 sr_do_sign(const br_ssl_server_policy_class **pctx,
116 unsigned algo_id, unsigned char *data, size_t hv_len, size_t len)
117 {
118 br_ssl_server_policy_rsa_context *pc;
119 unsigned char hv[64];
120 size_t sig_len;
121 const unsigned char *hash_oid;
122
123 pc = (br_ssl_server_policy_rsa_context *)pctx;
124 memcpy(hv, data, hv_len);
125 algo_id &= 0xFF;
126 if (algo_id == 0) {
127 hash_oid = NULL;
128 } else if (algo_id >= 2 && algo_id <= 6) {
129 hash_oid = HASH_OID[algo_id - 2];
130 } else {
131 return 0;
132 }
133 sig_len = (pc->sk->n_bitlen + 7) >> 3;
134 if (len < sig_len) {
135 return 0;
136 }
137 return pc->irsasign(hash_oid, hv, hv_len, pc->sk, data) ? sig_len : 0;
138 }
139
140 static const br_ssl_server_policy_class sr_policy_vtable = {
141 sizeof(br_ssl_server_policy_rsa_context),
142 sr_choose,
143 sr_do_keyx,
144 sr_do_sign
145 };
146
147 /* see bearssl_ssl.h */
148 void
br_ssl_server_set_single_rsa(br_ssl_server_context * cc,const br_x509_certificate * chain,size_t chain_len,const br_rsa_private_key * sk,unsigned allowed_usages,br_rsa_private irsacore,br_rsa_pkcs1_sign irsasign)149 br_ssl_server_set_single_rsa(br_ssl_server_context *cc,
150 const br_x509_certificate *chain, size_t chain_len,
151 const br_rsa_private_key *sk, unsigned allowed_usages,
152 br_rsa_private irsacore, br_rsa_pkcs1_sign irsasign)
153 {
154 cc->chain_handler.single_rsa.vtable = &sr_policy_vtable;
155 cc->chain_handler.single_rsa.chain = chain;
156 cc->chain_handler.single_rsa.chain_len = chain_len;
157 cc->chain_handler.single_rsa.sk = sk;
158 cc->chain_handler.single_rsa.allowed_usages = allowed_usages;
159 cc->chain_handler.single_rsa.irsacore = irsacore;
160 cc->chain_handler.single_rsa.irsasign = irsasign;
161 cc->policy_vtable = &cc->chain_handler.single_rsa.vtable;
162 }
163