3 * Written by Rob Stradling (rob@comodo.com) for the OpenSSL project 2014.
5 /* ====================================================================
6 * Copyright (c) 2014 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com). This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
60 #include "internal/cryptlib.h"
61 #include <openssl/asn1.h>
62 #include <openssl/x509v3.h>
64 #ifndef OPENSSL_NO_SCT
65 /* Signature and hash algorithms from RFC 5246 */
66 #define TLSEXT_hash_sha256 4
68 #define TLSEXT_signature_rsa 1
69 #define TLSEXT_signature_ecdsa 3
72 #define n2s(c,s) ((s=(((unsigned int)(c[0]))<< 8)| \
73 (((unsigned int)(c[1])) )),c+=2)
75 #define n2l8(c,l) (l =((uint64_t)(*((c)++)))<<56, \
76 l|=((uint64_t)(*((c)++)))<<48, \
77 l|=((uint64_t)(*((c)++)))<<40, \
78 l|=((uint64_t)(*((c)++)))<<32, \
79 l|=((uint64_t)(*((c)++)))<<24, \
80 l|=((uint64_t)(*((c)++)))<<16, \
81 l|=((uint64_t)(*((c)++)))<< 8, \
82 l|=((uint64_t)(*((c)++))))
84 typedef struct SCT_st {
87 unsigned short sctlen;
89 * Components of the SCT. "logid", "ext" and "sig" point to addresses
92 unsigned char version;
94 unsigned short logidlen;
97 unsigned short extlen;
98 unsigned char hash_alg;
99 unsigned char sig_alg;
101 unsigned short siglen;
104 DECLARE_STACK_OF(SCT)
106 static void SCT_LIST_free(STACK_OF(SCT) *a);
107 static STACK_OF(SCT) *d2i_SCT_LIST(STACK_OF(SCT) **a,
108 const unsigned char **pp, long length);
109 static int i2r_SCT_LIST(X509V3_EXT_METHOD *method, STACK_OF(SCT) *sct_list,
110 BIO *out, int indent);
112 const X509V3_EXT_METHOD v3_ct_scts[] = {
113 {NID_ct_precert_scts, 0, NULL,
114 0, (X509V3_EXT_FREE)SCT_LIST_free,
115 (X509V3_EXT_D2I)d2i_SCT_LIST, 0,
117 (X509V3_EXT_I2R)i2r_SCT_LIST, 0,
120 {NID_ct_cert_scts, 0, NULL,
121 0, (X509V3_EXT_FREE)SCT_LIST_free,
122 (X509V3_EXT_D2I)d2i_SCT_LIST, 0,
124 (X509V3_EXT_I2R)i2r_SCT_LIST, 0,
128 static void tls12_signature_print(BIO *out, const unsigned char hash_alg,
129 const unsigned char sig_alg)
132 /* RFC6962 only permits two signature algorithms */
133 if (hash_alg == TLSEXT_hash_sha256) {
134 if (sig_alg == TLSEXT_signature_rsa)
135 nid = NID_sha256WithRSAEncryption;
136 else if (sig_alg == TLSEXT_signature_ecdsa)
137 nid = NID_ecdsa_with_SHA256;
139 if (nid == NID_undef)
140 BIO_printf(out, "%02X%02X", hash_alg, sig_alg);
142 BIO_printf(out, "%s", OBJ_nid2ln(nid));
145 static void timestamp_print(BIO *out, uint64_t timestamp)
147 ASN1_GENERALIZEDTIME *gen;
149 gen = ASN1_GENERALIZEDTIME_new();
150 ASN1_GENERALIZEDTIME_adj(gen, (time_t)0,
151 (int)(timestamp / 86400000),
152 (timestamp % 86400000) / 1000);
154 * Note GeneralizedTime from ASN1_GENERALIZETIME_adj is always 15
155 * characters long with a final Z. Update it with fractional seconds.
157 BIO_snprintf(genstr, sizeof(genstr), "%.14s.%03dZ",
158 ASN1_STRING_data(gen), (unsigned int)(timestamp % 1000));
159 ASN1_GENERALIZEDTIME_set_string(gen, genstr);
160 ASN1_GENERALIZEDTIME_print(out, gen);
161 ASN1_GENERALIZEDTIME_free(gen);
164 static void SCT_free(SCT *sct)
168 OPENSSL_free(sct->sct);
172 static void SCT_LIST_free(STACK_OF(SCT) *a)
174 sk_SCT_pop_free(a, SCT_free);
177 static STACK_OF(SCT) *d2i_SCT_LIST(STACK_OF(SCT) **a,
178 const unsigned char **pp, long length)
180 ASN1_OCTET_STRING *oct = NULL;
181 STACK_OF(SCT) *sk = NULL;
183 unsigned char *p, *p2;
184 unsigned short listlen, sctlen = 0, fieldlen;
186 if (d2i_ASN1_OCTET_STRING(&oct, pp, length) == NULL)
192 if (listlen != oct->length - 2)
195 if ((sk = sk_SCT_new_null()) == NULL)
198 while (listlen > 0) {
204 if ((sctlen < 1) || (sctlen > listlen))
208 sct = OPENSSL_malloc(sizeof(*sct));
211 if (!sk_SCT_push(sk, sct)) {
216 sct->sct = OPENSSL_malloc(sctlen);
219 memcpy(sct->sct, p, sctlen);
220 sct->sctlen = sctlen;
224 sct->version = *p2++;
225 if (sct->version == 0) { /* SCT v1 */
227 * Fixed-length header:
229 * (1 byte) Version sct_version;
230 * (32 bytes) LogID id;
231 * (8 bytes) uint64 timestamp;
232 * (2 bytes + ?) CtExtensions extensions;
242 n2l8(p2, sct->timestamp);
245 if (sctlen < fieldlen)
248 sct->extlen = fieldlen;
253 * digitally-signed struct header:
254 * (1 byte) Hash algorithm
255 * (1 byte) Signature algorithm
256 * (2 bytes + ?) Signature
262 sct->hash_alg = *p2++;
263 sct->sig_alg = *p2++;
265 if (sctlen != fieldlen)
268 sct->siglen = fieldlen;
273 ASN1_OCTET_STRING_free(oct);
282 static int i2r_SCT_LIST(X509V3_EXT_METHOD *method, STACK_OF(SCT) *sct_list,
283 BIO *out, int indent)
288 for (i = 0; i < sk_SCT_num(sct_list);) {
289 sct = sk_SCT_value(sct_list, i);
291 BIO_printf(out, "%*sSigned Certificate Timestamp:", indent, "");
292 BIO_printf(out, "\n%*sVersion : ", indent + 4, "");
294 if (sct->version == 0) { /* SCT v1 */
295 BIO_printf(out, "v1(0)");
297 BIO_printf(out, "\n%*sLog ID : ", indent + 4, "");
298 BIO_hex_string(out, indent + 16, 16, sct->logid, sct->logidlen);
300 BIO_printf(out, "\n%*sTimestamp : ", indent + 4, "");
301 timestamp_print(out, sct->timestamp);
303 BIO_printf(out, "\n%*sExtensions: ", indent + 4, "");
304 if (sct->extlen == 0)
305 BIO_printf(out, "none");
307 BIO_hex_string(out, indent + 16, 16, sct->ext, sct->extlen);
309 BIO_printf(out, "\n%*sSignature : ", indent + 4, "");
310 tls12_signature_print(out, sct->hash_alg, sct->sig_alg);
311 BIO_printf(out, "\n%*s ", indent + 4, "");
312 BIO_hex_string(out, indent + 16, 16, sct->sig, sct->siglen);
313 } else { /* Unknown version */
315 BIO_printf(out, "unknown\n%*s", indent + 16, "");
316 BIO_hex_string(out, indent + 16, 16, sct->sct, sct->sctlen);
319 if (++i < sk_SCT_num(sct_list))
320 BIO_printf(out, "\n");