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

323 lines
8.5 KiB
C
Executable file

/* $OpenBSD: ct_sct_ctx.c,v 1.5 2021/12/18 16:34:52 tb 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 <stddef.h>
#include <string.h>
#include <openssl/err.h>
#include <openssl/obj_mac.h>
#include <openssl/x509.h>
#include "ct_local.h"
SCT_CTX *
SCT_CTX_new(void)
{
SCT_CTX *sctx = calloc(1, sizeof(*sctx));
if (sctx == NULL)
CTerror(ERR_R_MALLOC_FAILURE);
return sctx;
}
void
SCT_CTX_free(SCT_CTX *sctx)
{
if (sctx == NULL)
return;
EVP_PKEY_free(sctx->pkey);
free(sctx->pkeyhash);
free(sctx->ihash);
free(sctx->certder);
free(sctx->preder);
free(sctx);
}
/*
* Finds the index of the first extension with the given NID in cert.
* If there is more than one extension with that NID, *is_duplicated is set to
* 1, otherwise 0 (unless it is NULL).
*/
static int
ct_x509_get_ext(X509 *cert, int nid, int *is_duplicated)
{
int ret = X509_get_ext_by_NID(cert, nid, -1);
if (is_duplicated != NULL)
*is_duplicated = ret >= 0 &&
X509_get_ext_by_NID(cert, nid, ret) >= 0;
return ret;
}
/*
* Modifies a certificate by deleting extensions and copying the issuer and
* AKID from the presigner certificate, if necessary.
* Returns 1 on success, 0 otherwise.
*/
static int
ct_x509_cert_fixup(X509 *cert, X509 *presigner)
{
int preidx, certidx;
int pre_akid_ext_is_dup, cert_akid_ext_is_dup;
if (presigner == NULL)
return 1;
preidx = ct_x509_get_ext(presigner, NID_authority_key_identifier,
&pre_akid_ext_is_dup);
certidx = ct_x509_get_ext(cert, NID_authority_key_identifier,
&cert_akid_ext_is_dup);
/* An error occurred whilst searching for the extension */
if (preidx < -1 || certidx < -1)
return 0;
/* Invalid certificate if they contain duplicate extensions */
if (pre_akid_ext_is_dup || cert_akid_ext_is_dup)
return 0;
/* AKID must be present in both certificate or absent in both */
if (preidx >= 0 && certidx == -1)
return 0;
if (preidx == -1 && certidx >= 0)
return 0;
/* Copy issuer name */
if (!X509_set_issuer_name(cert, X509_get_issuer_name(presigner)))
return 0;
if (preidx != -1) {
/* Retrieve and copy AKID encoding */
X509_EXTENSION *preext = X509_get_ext(presigner, preidx);
X509_EXTENSION *certext = X509_get_ext(cert, certidx);
ASN1_OCTET_STRING *preextdata;
/* Should never happen */
if (preext == NULL || certext == NULL)
return 0;
preextdata = X509_EXTENSION_get_data(preext);
if (preextdata == NULL ||
!X509_EXTENSION_set_data(certext, preextdata))
return 0;
}
return 1;
}
int
SCT_CTX_set1_cert(SCT_CTX *sctx, X509 *cert, X509 *presigner)
{
unsigned char *certder = NULL, *preder = NULL;
X509 *pretmp = NULL;
int certderlen = 0, prederlen = 0;
int idx = -1;
int poison_ext_is_dup, sct_ext_is_dup;
int poison_idx = ct_x509_get_ext(cert, NID_ct_precert_poison, &poison_ext_is_dup);
/* Duplicate poison extensions are present - error */
if (poison_ext_is_dup)
goto err;
/* If *cert doesn't have a poison extension, it isn't a precert */
if (poison_idx == -1) {
/* cert isn't a precert, so we shouldn't have a presigner */
if (presigner != NULL)
goto err;
certderlen = i2d_X509(cert, &certder);
if (certderlen < 0)
goto err;
}
/* See if cert has a precert SCTs extension */
idx = ct_x509_get_ext(cert, NID_ct_precert_scts, &sct_ext_is_dup);
/* Duplicate SCT extensions are present - error */
if (sct_ext_is_dup)
goto err;
if (idx >= 0 && poison_idx >= 0) {
/*
* cert can't both contain SCTs (i.e. have an SCT extension) and be a
* precert (i.e. have a poison extension).
*/
goto err;
}
if (idx == -1) {
idx = poison_idx;
}
/*
* If either a poison or SCT extension is present, remove it before encoding
* cert. This, along with ct_x509_cert_fixup(), gets a TBSCertificate (see
* RFC5280) from cert, which is what the CT log signed when it produced the
* SCT.
*/
if (idx >= 0) {
X509_EXTENSION *ext;
/* Take a copy of certificate so we don't modify passed version */
pretmp = X509_dup(cert);
if (pretmp == NULL)
goto err;
ext = X509_delete_ext(pretmp, idx);
X509_EXTENSION_free(ext);
if (!ct_x509_cert_fixup(pretmp, presigner))
goto err;
prederlen = i2d_re_X509_tbs(pretmp, &preder);
if (prederlen <= 0)
goto err;
}
X509_free(pretmp);
free(sctx->certder);
sctx->certder = certder;
sctx->certderlen = certderlen;
free(sctx->preder);
sctx->preder = preder;
sctx->prederlen = prederlen;
return 1;
err:
free(certder);
free(preder);
X509_free(pretmp);
return 0;
}
static int
ct_public_key_hash(X509_PUBKEY *pkey, unsigned char **hash, size_t *hash_len)
{
int ret = 0;
unsigned char *md = NULL, *der = NULL;
int der_len;
unsigned int md_len;
/* Reuse buffer if possible */
if (*hash != NULL && *hash_len >= SHA256_DIGEST_LENGTH) {
md = *hash;
} else {
md = malloc(SHA256_DIGEST_LENGTH);
if (md == NULL)
goto err;
}
/* Calculate key hash */
der_len = i2d_X509_PUBKEY(pkey, &der);
if (der_len <= 0)
goto err;
if (!EVP_Digest(der, der_len, md, &md_len, EVP_sha256(), NULL))
goto err;
if (md != *hash) {
free(*hash);
*hash = md;
*hash_len = SHA256_DIGEST_LENGTH;
}
md = NULL;
ret = 1;
err:
free(md);
free(der);
return ret;
}
int
SCT_CTX_set1_issuer(SCT_CTX *sctx, const X509 *issuer)
{
return SCT_CTX_set1_issuer_pubkey(sctx, X509_get_X509_PUBKEY(issuer));
}
int
SCT_CTX_set1_issuer_pubkey(SCT_CTX *sctx, X509_PUBKEY *pubkey)
{
return ct_public_key_hash(pubkey, &sctx->ihash, &sctx->ihashlen);
}
int
SCT_CTX_set1_pubkey(SCT_CTX *sctx, X509_PUBKEY *pubkey)
{
EVP_PKEY *pkey = X509_PUBKEY_get(pubkey);
if (pkey == NULL)
return 0;
if (!ct_public_key_hash(pubkey, &sctx->pkeyhash, &sctx->pkeyhashlen)) {
EVP_PKEY_free(pkey);
return 0;
}
EVP_PKEY_free(sctx->pkey);
sctx->pkey = pkey;
return 1;
}
void
SCT_CTX_set_time(SCT_CTX *sctx, uint64_t time_in_ms)
{
sctx->epoch_time_in_ms = time_in_ms;
}