pineapple/externals/libressl/crypto/ct/ct_oct.c
2022-04-24 22:29:35 +02:00

458 lines
9.8 KiB
C
Executable file

/* $OpenBSD: ct_oct.c,v 1.8 2021/12/20 17:23:07 jsing Exp $ */
/*
* Written by Rob Stradling (rob@comodo.com) and Stephen Henson
* (steve@openssl.org) 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).
*
*/
#ifdef OPENSSL_NO_CT
# error "CT is disabled"
#endif
#include <limits.h>
#include <string.h>
#include <openssl/asn1.h>
#include <openssl/buffer.h>
#include <openssl/ct.h>
#include <openssl/err.h>
#include "bytestring.h"
#include "ct_local.h"
int
o2i_SCT_signature(SCT *sct, CBS *cbs)
{
uint8_t hash_alg, sig_alg;
CBS signature;
if (sct->version != SCT_VERSION_V1) {
CTerror(CT_R_UNSUPPORTED_VERSION);
return 0;
}
/*
* Parse a digitally-signed element - see RFC 6962 section 3.2 and
* RFC 5246 sections 4.7 and 7.4.1.4.1.
*/
if (!CBS_get_u8(cbs, &hash_alg))
goto err_invalid;
if (!CBS_get_u8(cbs, &sig_alg))
goto err_invalid;
if (!CBS_get_u16_length_prefixed(cbs, &signature))
goto err_invalid;
if (CBS_len(cbs) != 0)
goto err_invalid;
/*
* Reject empty signatures since they are invalid for all supported
* algorithms (this really should be done by SCT_set1_signature()).
*/
if (CBS_len(&signature) == 0)
goto err_invalid;
sct->hash_alg = hash_alg;
sct->sig_alg = sig_alg;
if (SCT_get_signature_nid(sct) == NID_undef)
goto err_invalid;
if (!SCT_set1_signature(sct, CBS_data(&signature), CBS_len(&signature)))
return 0;
return 1;
err_invalid:
CTerror(CT_R_SCT_INVALID_SIGNATURE);
return 0;
}
static int
o2i_SCT_internal(SCT **out_sct, CBS *cbs)
{
SCT *sct = NULL;
uint8_t version;
*out_sct = NULL;
if ((sct = SCT_new()) == NULL)
goto err;
if (CBS_len(cbs) > MAX_SCT_SIZE)
goto err_invalid;
if (!CBS_peek_u8(cbs, &version))
goto err_invalid;
sct->version = version;
if (version == SCT_VERSION_V1) {
CBS extensions, log_id;
uint64_t timestamp;
/*
* Parse a v1 SignedCertificateTimestamp - see RFC 6962
* section 3.2.
*/
if (!CBS_get_u8(cbs, &version))
goto err_invalid;
if (!CBS_get_bytes(cbs, &log_id, CT_V1_LOG_ID_LEN))
goto err_invalid;
if (!CBS_get_u64(cbs, &timestamp))
goto err_invalid;
if (!CBS_get_u16_length_prefixed(cbs, &extensions))
goto err_invalid;
if (!CBS_stow(&log_id, &sct->log_id, &sct->log_id_len))
goto err;
sct->timestamp = timestamp;
if (!CBS_stow(&extensions, &sct->ext, &sct->ext_len))
goto err;
if (!o2i_SCT_signature(sct, cbs))
goto err;
if (CBS_len(cbs) != 0)
goto err_invalid;
} else {
/* If not V1 just cache encoding. */
if (!CBS_stow(cbs, &sct->sct, &sct->sct_len))
goto err;
}
*out_sct = sct;
return 1;
err_invalid:
CTerror(CT_R_SCT_INVALID);
err:
SCT_free(sct);
return 0;
}
SCT *
o2i_SCT(SCT **psct, const unsigned char **in, size_t len)
{
SCT *sct;
CBS cbs;
CBS_init(&cbs, *in, len);
if (psct != NULL) {
SCT_free(*psct);
*psct = NULL;
}
if (!o2i_SCT_internal(&sct, &cbs))
return NULL;
if (psct != NULL)
*psct = sct;
*in = CBS_data(&cbs);
return sct;
}
int
i2o_SCT_signature(const SCT *sct, unsigned char **out)
{
size_t len;
unsigned char *p = NULL, *pstart = NULL;
if (!SCT_signature_is_complete(sct)) {
CTerror(CT_R_SCT_INVALID_SIGNATURE);
goto err;
}
if (sct->version != SCT_VERSION_V1) {
CTerror(CT_R_UNSUPPORTED_VERSION);
goto err;
}
/*
* (1 byte) Hash algorithm
* (1 byte) Signature algorithm
* (2 bytes + ?) Signature
*/
len = 4 + sct->sig_len;
if (out != NULL) {
if (*out != NULL) {
p = *out;
*out += len;
} else {
pstart = p = malloc(len);
if (p == NULL) {
CTerror(ERR_R_MALLOC_FAILURE);
goto err;
}
*out = p;
}
*p++ = sct->hash_alg;
*p++ = sct->sig_alg;
s2n(sct->sig_len, p);
memcpy(p, sct->sig, sct->sig_len);
}
return len;
err:
free(pstart);
return -1;
}
int
i2o_SCT(const SCT *sct, unsigned char **out)
{
size_t len;
unsigned char *p = NULL, *pstart = NULL;
if (!SCT_is_complete(sct)) {
CTerror(CT_R_SCT_NOT_SET);
goto err;
}
/*
* Fixed-length header: struct { (1 byte) Version sct_version; (32 bytes)
* log_id id; (8 bytes) uint64 timestamp; (2 bytes + ?) CtExtensions
* extensions; (1 byte) Hash algorithm (1 byte) Signature algorithm (2
* bytes + ?) Signature
*/
if (sct->version == SCT_VERSION_V1)
len = 43 + sct->ext_len + 4 + sct->sig_len;
else
len = sct->sct_len;
if (out == NULL)
return len;
if (*out != NULL) {
p = *out;
*out += len;
} else {
pstart = p = malloc(len);
if (p == NULL) {
CTerror(ERR_R_MALLOC_FAILURE);
goto err;
}
*out = p;
}
if (sct->version == SCT_VERSION_V1) {
*p++ = sct->version;
memcpy(p, sct->log_id, CT_V1_HASHLEN);
p += CT_V1_HASHLEN;
l2n8(sct->timestamp, p);
s2n(sct->ext_len, p);
if (sct->ext_len > 0) {
memcpy(p, sct->ext, sct->ext_len);
p += sct->ext_len;
}
if (i2o_SCT_signature(sct, &p) <= 0)
goto err;
} else {
memcpy(p, sct->sct, len);
}
return len;
err:
free(pstart);
return -1;
}
STACK_OF(SCT) *
o2i_SCT_LIST(STACK_OF(SCT) **out_scts, const unsigned char **pp, size_t len)
{
CBS cbs, cbs_scts, cbs_sct;
STACK_OF(SCT) *scts = NULL;
CBS_init(&cbs, *pp, len);
if (CBS_len(&cbs) > MAX_SCT_LIST_SIZE)
goto err_invalid;
if (!CBS_get_u16_length_prefixed(&cbs, &cbs_scts))
goto err_invalid;
if (CBS_len(&cbs) != 0)
goto err_invalid;
if (out_scts != NULL) {
SCT_LIST_free(*out_scts);
*out_scts = NULL;
}
if ((scts = sk_SCT_new_null()) == NULL)
return NULL;
while (CBS_len(&cbs_scts) > 0) {
SCT *sct;
if (!CBS_get_u16_length_prefixed(&cbs_scts, &cbs_sct))
goto err_invalid;
if (!o2i_SCT_internal(&sct, &cbs_sct))
goto err;
if (!sk_SCT_push(scts, sct)) {
SCT_free(sct);
goto err;
}
}
if (out_scts != NULL)
*out_scts = scts;
*pp = CBS_data(&cbs);
return scts;
err_invalid:
CTerror(CT_R_SCT_LIST_INVALID);
err:
SCT_LIST_free(scts);
return NULL;
}
int
i2o_SCT_LIST(const STACK_OF(SCT) *a, unsigned char **pp)
{
int len, sct_len, i, is_pp_new = 0;
size_t len2;
unsigned char *p = NULL, *p2;
if (pp != NULL) {
if (*pp == NULL) {
if ((len = i2o_SCT_LIST(a, NULL)) == -1) {
CTerror(CT_R_SCT_LIST_INVALID);
return -1;
}
if ((*pp = malloc(len)) == NULL) {
CTerror(ERR_R_MALLOC_FAILURE);
return -1;
}
is_pp_new = 1;
}
p = *pp + 2;
}
len2 = 2;
for (i = 0; i < sk_SCT_num(a); i++) {
if (pp != NULL) {
p2 = p;
p += 2;
if ((sct_len = i2o_SCT(sk_SCT_value(a, i), &p)) == -1)
goto err;
s2n(sct_len, p2);
} else {
if ((sct_len = i2o_SCT(sk_SCT_value(a, i), NULL)) == -1)
goto err;
}
len2 += 2 + sct_len;
}
if (len2 > MAX_SCT_LIST_SIZE)
goto err;
if (pp != NULL) {
p = *pp;
s2n(len2 - 2, p);
if (!is_pp_new)
*pp += len2;
}
return len2;
err:
if (is_pp_new) {
free(*pp);
*pp = NULL;
}
return -1;
}
STACK_OF(SCT) *
d2i_SCT_LIST(STACK_OF(SCT) **a, const unsigned char **pp, long len)
{
ASN1_OCTET_STRING *oct = NULL;
STACK_OF(SCT) *sk = NULL;
const unsigned char *p;
p = *pp;
if (d2i_ASN1_OCTET_STRING(&oct, &p, len) == NULL)
return NULL;
p = oct->data;
if ((sk = o2i_SCT_LIST(a, &p, oct->length)) != NULL)
*pp += len;
ASN1_OCTET_STRING_free(oct);
return sk;
}
int
i2d_SCT_LIST(const STACK_OF(SCT) *a, unsigned char **out)
{
ASN1_OCTET_STRING oct;
int len;
oct.data = NULL;
if ((oct.length = i2o_SCT_LIST(a, &oct.data)) == -1)
return -1;
len = i2d_ASN1_OCTET_STRING(&oct, out);
free(oct.data);
return len;
}