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