/* v3_scts.c */
/*
* Written by Rob Stradling (rob@comodo.com) for the OpenSSL project 2014.
*/
/* ====================================================================
* Copyright (c) 2014 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* licensing@OpenSSL.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
#include <stdio.h>
#include "cryptlib.h"
#include <openssl/asn1.h>
#include <openssl/x509v3.h>
/* Signature and hash algorithms from RFC 5246 */
#define TLSEXT_hash_sha256 4
#define TLSEXT_signature_rsa 1
#define TLSEXT_signature_ecdsa 3
#define n2s(c,s) ((s=(((unsigned int)(c[0]))<< 8)| \
(((unsigned int)(c[1])) )),c+=2)
#if (defined(_WIN32) || defined(_WIN64)) && !defined(__MINGW32__)
# define SCT_TIMESTAMP unsigned __int64
#elif defined(__arch64__)
# define SCT_TIMESTAMP unsigned long
#else
# define SCT_TIMESTAMP unsigned long long
#endif
#define n2l8(c,l) (l =((SCT_TIMESTAMP)(*((c)++)))<<56, \
l|=((SCT_TIMESTAMP)(*((c)++)))<<48, \
l|=((SCT_TIMESTAMP)(*((c)++)))<<40, \
l|=((SCT_TIMESTAMP)(*((c)++)))<<32, \
l|=((SCT_TIMESTAMP)(*((c)++)))<<24, \
l|=((SCT_TIMESTAMP)(*((c)++)))<<16, \
l|=((SCT_TIMESTAMP)(*((c)++)))<< 8, \
l|=((SCT_TIMESTAMP)(*((c)++))))
typedef struct SCT_st {
/* The encoded SCT */
unsigned char *sct;
unsigned short sctlen;
/*
* Components of the SCT. "logid", "ext" and "sig" point to addresses
* inside "sct".
*/
unsigned char version;
unsigned char *logid;
unsigned short logidlen;
SCT_TIMESTAMP timestamp;
unsigned char *ext;
unsigned short extlen;
unsigned char hash_alg;
unsigned char sig_alg;
unsigned char *sig;
unsigned short siglen;
} SCT;
DECLARE_STACK_OF(SCT)
static void SCT_LIST_free(STACK_OF(SCT) *a);
static STACK_OF(SCT) *d2i_SCT_LIST(STACK_OF(SCT) **a,
const unsigned char **pp, long length);
static int i2r_SCT_LIST(X509V3_EXT_METHOD *method, STACK_OF(SCT) *sct_list,
BIO *out, int indent);
const X509V3_EXT_METHOD v3_ct_scts[] = {
{NID_ct_precert_scts, 0, NULL,
0, (X509V3_EXT_FREE)SCT_LIST_free,
(X509V3_EXT_D2I)d2i_SCT_LIST, 0,
0, 0, 0, 0,
(X509V3_EXT_I2R)i2r_SCT_LIST, 0,
NULL},
{NID_ct_cert_scts, 0, NULL,
0, (X509V3_EXT_FREE)SCT_LIST_free,
(X509V3_EXT_D2I)d2i_SCT_LIST, 0,
0, 0, 0, 0,
(X509V3_EXT_I2R)i2r_SCT_LIST, 0,
NULL},
};
static void tls12_signature_print(BIO *out, const unsigned char hash_alg,
const unsigned char sig_alg)
{
int nid = NID_undef;
/* RFC6962 only permits two signature algorithms */
if (hash_alg == TLSEXT_hash_sha256) {
if (sig_alg == TLSEXT_signature_rsa)
nid = NID_sha256WithRSAEncryption;
else if (sig_alg == TLSEXT_signature_ecdsa)
nid = NID_ecdsa_with_SHA256;
}
if (nid == NID_undef)
BIO_printf(out, "%02X%02X", hash_alg, sig_alg);
else
BIO_printf(out, "%s", OBJ_nid2ln(nid));
}
static void timestamp_print(BIO *out, SCT_TIMESTAMP timestamp)
{
ASN1_GENERALIZEDTIME *gen;
char genstr[20];
gen = ASN1_GENERALIZEDTIME_new();
ASN1_GENERALIZEDTIME_adj(gen, (time_t)0,
(int)(timestamp / 86400000),
(timestamp % 86400000) / 1000);
/*
* Note GeneralizedTime from ASN1_GENERALIZETIME_adj is always 15
* characters long with a final Z. Update it with fractional seconds.
*/
BIO_snprintf(genstr, sizeof(genstr), "%.14s.%03dZ",
ASN1_STRING_data(gen), (unsigned int)(timestamp % 1000));
ASN1_GENERALIZEDTIME_set_string(gen, genstr);
ASN1_GENERALIZEDTIME_print(out, gen);
ASN1_GENERALIZEDTIME_free(gen);
}
static void SCT_free(SCT *sct)
{
if (sct) {
if (sct->sct)
OPENSSL_free(sct->sct);
OPENSSL_free(sct);
}
}
static void SCT_LIST_free(STACK_OF(SCT) *a)
{
sk_SCT_pop_free(a, SCT_free);
}
static STACK_OF(SCT) *d2i_SCT_LIST(STACK_OF(SCT) **a,
const unsigned char **pp, long length)
{
ASN1_OCTET_STRING *oct = NULL;
STACK_OF(SCT) *sk = NULL;
SCT *sct;
unsigned char *p, *p2;
unsigned short listlen, sctlen = 0, fieldlen;
const unsigned char *q = *pp;
if (d2i_ASN1_OCTET_STRING(&oct, &q, length) == NULL)
return NULL;
if (oct->length < 2)
goto done;
p = oct->data;
n2s(p, listlen);
if (listlen != oct->length - 2)
goto done;
if ((sk = sk_SCT_new_null()) == NULL)
goto done;
while (listlen > 0) {
if (listlen < 2)
goto err;
n2s(p, sctlen);
listlen -= 2;
if ((sctlen < 1) || (sctlen > listlen))
goto err;
listlen -= sctlen;
sct = OPENSSL_malloc(sizeof(SCT));
if (!sct)
goto err;
if (!sk_SCT_push(sk, sct)) {
OPENSSL_free(sct);
goto err;
}
sct->sct = OPENSSL_malloc(sctlen);
if (!sct->sct)
goto err;
memcpy(sct->sct, p, sctlen);
sct->sctlen = sctlen;
p += sctlen;
p2 = sct->sct;
sct->version = *p2++;
if (sct->version == 0) { /* SCT v1 */
/*-
* Fixed-length header:
* struct {
* (1 byte) Version sct_version;
* (32 bytes) LogID id;
* (8 bytes) uint64 timestamp;
* (2 bytes + ?) CtExtensions extensions;
*/
if (sctlen < 43)
goto err;
sctlen -= 43;
sct->logid = p2;
sct->logidlen = 32;
p2 += 32;
n2l8(p2, sct->timestamp);
n2s(p2, fieldlen);
if (sctlen < fieldlen)
goto err;
sct->ext = p2;
sct->extlen = fieldlen;
p2 += fieldlen;
sctlen -= fieldlen;
/*-
* digitally-signed struct header:
* (1 byte) Hash algorithm
* (1 byte) Signature algorithm
* (2 bytes + ?) Signature
*/
if (sctlen < 4)
goto err;
sctlen -= 4;
sct->hash_alg = *p2++;
sct->sig_alg = *p2++;
n2s(p2, fieldlen);
if (sctlen != fieldlen)
goto err;
sct->sig = p2;
sct->siglen = fieldlen;
}
}
done:
ASN1_OCTET_STRING_free(oct);
*pp = q;
return sk;
err:
SCT_LIST_free(sk);
sk = NULL;
goto done;
}
static int i2r_SCT_LIST(X509V3_EXT_METHOD *method, STACK_OF(SCT) *sct_list,
BIO *out, int indent)
{
SCT *sct;
int i;
for (i = 0; i < sk_SCT_num(sct_list);) {
sct = sk_SCT_value(sct_list, i);
BIO_printf(out, "%*sSigned Certificate Timestamp:", indent, "");
BIO_printf(out, "\n%*sVersion : ", indent + 4, "");
if (sct->version == 0) { /* SCT v1 */
BIO_printf(out, "v1(0)");
BIO_printf(out, "\n%*sLog ID : ", indent + 4, "");
BIO_hex_string(out, indent + 16, 16, sct->logid, sct->logidlen);
BIO_printf(out, "\n%*sTimestamp : ", indent + 4, "");
timestamp_print(out, sct->timestamp);
BIO_printf(out, "\n%*sExtensions: ", indent + 4, "");
if (sct->extlen == 0)
BIO_printf(out, "none");
else
BIO_hex_string(out, indent + 16, 16, sct->ext, sct->extlen);
BIO_printf(out, "\n%*sSignature : ", indent + 4, "");
tls12_signature_print(out, sct->hash_alg, sct->sig_alg);
BIO_printf(out, "\n%*s ", indent + 4, "");
BIO_hex_string(out, indent + 16, 16, sct->sig, sct->siglen);
} else { /* Unknown version */
BIO_printf(out, "unknown\n%*s", indent + 16, "");
BIO_hex_string(out, indent + 16, 16, sct->sct, sct->sctlen);
}
if (++i < sk_SCT_num(sct_list))
BIO_printf(out, "\n");
}
return 1;
}