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openssl/crypto/x509v3/v3_scts.c
David Woodhouse 05d7bf6c5b RT3992: Make SCT #ifdeffable. 
This code does open-coded division on 64-bit quantities and thus when
building with GCC on 32-bit platforms will require functions such as
__umoddi3 and __udivdi3 from libgcc.

In constrained environments such as firmware, those functions may not
be available. So make it possible to compile out SCT support, which in
fact (in the case of UEFI) we don't need anyway.

Signed-off-by: Rich Salz <rsalz@akamai.com>
Reviewed-by: Tim Hudson <tjh@openssl.org>
2015-09-09 18:28:13 -04:00

325 lines
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/* 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 "internal/cryptlib.h"
#include <openssl/asn1.h>
#include <openssl/x509v3.h>
#ifndef OPENSSL_NO_SCT
/* 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)
#define n2l8(c,l) (l =((uint64_t)(*((c)++)))<<56, \
l|=((uint64_t)(*((c)++)))<<48, \
l|=((uint64_t)(*((c)++)))<<40, \
l|=((uint64_t)(*((c)++)))<<32, \
l|=((uint64_t)(*((c)++)))<<24, \
l|=((uint64_t)(*((c)++)))<<16, \
l|=((uint64_t)(*((c)++)))<< 8, \
l|=((uint64_t)(*((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;
uint64_t 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, uint64_t 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)
return;
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;
if (d2i_ASN1_OCTET_STRING(&oct, pp, 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);
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;
}
#endif
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