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openssl/crypto/ess/ess_lib.c
Matt Caswell 1e14bca233 Fix safestack issues in ess.h 
Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/12781)
2020-09-13 11:10:41 +01:00

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/*
* Copyright 2019-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <string.h>
#include <openssl/x509v3.h>
#include <openssl/err.h>
#include <openssl/ess.h>
#include "crypto/ess.h"
#include "crypto/x509.h"
static ESS_CERT_ID *ESS_CERT_ID_new_init(X509 *cert, int issuer_needed);
static ESS_CERT_ID_V2 *ESS_CERT_ID_V2_new_init(const EVP_MD *hash_alg,
X509 *cert, int issuer_needed);
ESS_SIGNING_CERT *ESS_SIGNING_CERT_new_init(X509 *signcert,
STACK_OF(X509) *certs,
int issuer_needed)
{
ESS_CERT_ID *cid = NULL;
ESS_SIGNING_CERT *sc;
int i;
if ((sc = ESS_SIGNING_CERT_new()) == NULL)
goto err;
if (sc->cert_ids == NULL
&& (sc->cert_ids = sk_ESS_CERT_ID_new_null()) == NULL)
goto err;
if ((cid = ESS_CERT_ID_new_init(signcert, issuer_needed)) == NULL
|| !sk_ESS_CERT_ID_push(sc->cert_ids, cid))
goto err;
for (i = 0; i < sk_X509_num(certs); ++i) {
X509 *cert = sk_X509_value(certs, i);
if ((cid = ESS_CERT_ID_new_init(cert, 1)) == NULL
|| !sk_ESS_CERT_ID_push(sc->cert_ids, cid))
goto err;
}
return sc;
err:
ESS_SIGNING_CERT_free(sc);
ESS_CERT_ID_free(cid);
ESSerr(ESS_F_ESS_SIGNING_CERT_NEW_INIT, ERR_R_MALLOC_FAILURE);
return NULL;
}
static ESS_CERT_ID *ESS_CERT_ID_new_init(X509 *cert, int issuer_needed)
{
ESS_CERT_ID *cid = NULL;
GENERAL_NAME *name = NULL;
unsigned char cert_sha1[SHA_DIGEST_LENGTH];
/* Call for side-effect of computing hash and caching extensions */
if (!x509v3_cache_extensions(cert))
return NULL;
if ((cid = ESS_CERT_ID_new()) == NULL)
goto err;
/* TODO(3.0): fetch sha1 algorithm from providers */
if (!X509_digest(cert, EVP_sha1(), cert_sha1, NULL))
goto err;
if (!ASN1_OCTET_STRING_set(cid->hash, cert_sha1, SHA_DIGEST_LENGTH))
goto err;
/* Setting the issuer/serial if requested. */
if (!issuer_needed)
return cid;
if (cid->issuer_serial == NULL
&& (cid->issuer_serial = ESS_ISSUER_SERIAL_new()) == NULL)
goto err;
if ((name = GENERAL_NAME_new()) == NULL)
goto err;
name->type = GEN_DIRNAME;
if ((name->d.dirn = X509_NAME_dup(X509_get_issuer_name(cert))) == NULL)
goto err;
if (!sk_GENERAL_NAME_push(cid->issuer_serial->issuer, name))
goto err;
name = NULL; /* Ownership is lost. */
ASN1_INTEGER_free(cid->issuer_serial->serial);
if ((cid->issuer_serial->serial =
ASN1_INTEGER_dup(X509_get0_serialNumber(cert))) == NULL)
goto err;
return cid;
err:
GENERAL_NAME_free(name);
ESS_CERT_ID_free(cid);
ESSerr(ESS_F_ESS_CERT_ID_NEW_INIT, ERR_R_MALLOC_FAILURE);
return NULL;
}
ESS_SIGNING_CERT_V2 *ESS_SIGNING_CERT_V2_new_init(const EVP_MD *hash_alg,
X509 *signcert,
STACK_OF(X509) *certs,
int issuer_needed)
{
ESS_CERT_ID_V2 *cid = NULL;
ESS_SIGNING_CERT_V2 *sc;
int i;
if ((sc = ESS_SIGNING_CERT_V2_new()) == NULL)
goto err;
if ((cid = ESS_CERT_ID_V2_new_init(hash_alg, signcert, issuer_needed)) == NULL)
goto err;
if (!sk_ESS_CERT_ID_V2_push(sc->cert_ids, cid))
goto err;
cid = NULL;
for (i = 0; i < sk_X509_num(certs); ++i) {
X509 *cert = sk_X509_value(certs, i);
if ((cid = ESS_CERT_ID_V2_new_init(hash_alg, cert, 1)) == NULL)
goto err;
if (!sk_ESS_CERT_ID_V2_push(sc->cert_ids, cid))
goto err;
cid = NULL;
}
return sc;
err:
ESS_SIGNING_CERT_V2_free(sc);
ESS_CERT_ID_V2_free(cid);
ESSerr(ESS_F_ESS_SIGNING_CERT_V2_NEW_INIT, ERR_R_MALLOC_FAILURE);
return NULL;
}
static ESS_CERT_ID_V2 *ESS_CERT_ID_V2_new_init(const EVP_MD *hash_alg,
X509 *cert, int issuer_needed)
{
ESS_CERT_ID_V2 *cid;
GENERAL_NAME *name = NULL;
unsigned char hash[EVP_MAX_MD_SIZE];
unsigned int hash_len = sizeof(hash);
X509_ALGOR *alg = NULL;
memset(hash, 0, sizeof(hash));
if ((cid = ESS_CERT_ID_V2_new()) == NULL)
goto err;
if (hash_alg != EVP_sha256()) {
alg = X509_ALGOR_new();
if (alg == NULL)
goto err;
X509_ALGOR_set_md(alg, hash_alg);
if (alg->algorithm == NULL)
goto err;
cid->hash_alg = alg;
alg = NULL;
} else {
cid->hash_alg = NULL;
}
/* TODO(3.0): fetch sha1 algorithm from providers */
if (!X509_digest(cert, hash_alg, hash, &hash_len))
goto err;
if (!ASN1_OCTET_STRING_set(cid->hash, hash, hash_len))
goto err;
if (!issuer_needed)
return cid;
if ((cid->issuer_serial = ESS_ISSUER_SERIAL_new()) == NULL)
goto err;
if ((name = GENERAL_NAME_new()) == NULL)
goto err;
name->type = GEN_DIRNAME;
if ((name->d.dirn = X509_NAME_dup(X509_get_issuer_name(cert))) == NULL)
goto err;
if (!sk_GENERAL_NAME_push(cid->issuer_serial->issuer, name))
goto err;
name = NULL; /* Ownership is lost. */
ASN1_INTEGER_free(cid->issuer_serial->serial);
cid->issuer_serial->serial = ASN1_INTEGER_dup(X509_get0_serialNumber(cert));
if (cid->issuer_serial->serial == NULL)
goto err;
return cid;
err:
X509_ALGOR_free(alg);
GENERAL_NAME_free(name);
ESS_CERT_ID_V2_free(cid);
ESSerr(ESS_F_ESS_CERT_ID_V2_NEW_INIT, ERR_R_MALLOC_FAILURE);
return NULL;
}
ESS_SIGNING_CERT *ESS_SIGNING_CERT_get(PKCS7_SIGNER_INFO *si)
{
ASN1_TYPE *attr;
const unsigned char *p;
attr = PKCS7_get_signed_attribute(si, NID_id_smime_aa_signingCertificate);
if (attr == NULL)
return NULL;
p = attr->value.sequence->data;
return d2i_ESS_SIGNING_CERT(NULL, &p, attr->value.sequence->length);
}
ESS_SIGNING_CERT_V2 *ESS_SIGNING_CERT_V2_get(PKCS7_SIGNER_INFO *si)
{
ASN1_TYPE *attr;
const unsigned char *p;
attr = PKCS7_get_signed_attribute(si, NID_id_smime_aa_signingCertificateV2);
if (attr == NULL)
return NULL;
p = attr->value.sequence->data;
return d2i_ESS_SIGNING_CERT_V2(NULL, &p, attr->value.sequence->length);
}
int ESS_SIGNING_CERT_add(PKCS7_SIGNER_INFO *si, ESS_SIGNING_CERT *sc)
{
ASN1_STRING *seq = NULL;
unsigned char *p, *pp = NULL;
int len;
len = i2d_ESS_SIGNING_CERT(sc, NULL);
if ((pp = OPENSSL_malloc(len)) == NULL) {
ESSerr(ESS_F_ESS_SIGNING_CERT_ADD, ERR_R_MALLOC_FAILURE);
goto err;
}
p = pp;
i2d_ESS_SIGNING_CERT(sc, &p);
if ((seq = ASN1_STRING_new()) == NULL || !ASN1_STRING_set(seq, pp, len)) {
ESSerr(ESS_F_ESS_SIGNING_CERT_ADD, ERR_R_MALLOC_FAILURE);
goto err;
}
OPENSSL_free(pp);
pp = NULL;
return PKCS7_add_signed_attribute(si,
NID_id_smime_aa_signingCertificate,
V_ASN1_SEQUENCE, seq);
err:
ASN1_STRING_free(seq);
OPENSSL_free(pp);
return 0;
}
int ESS_SIGNING_CERT_V2_add(PKCS7_SIGNER_INFO *si,
ESS_SIGNING_CERT_V2 *sc)
{
ASN1_STRING *seq = NULL;
unsigned char *p, *pp = NULL;
int len = i2d_ESS_SIGNING_CERT_V2(sc, NULL);
if ((pp = OPENSSL_malloc(len)) == NULL) {
ESSerr(ESS_F_ESS_SIGNING_CERT_V2_ADD, ERR_R_MALLOC_FAILURE);
goto err;
}
p = pp;
i2d_ESS_SIGNING_CERT_V2(sc, &p);
if ((seq = ASN1_STRING_new()) == NULL || !ASN1_STRING_set(seq, pp, len)) {
ESSerr(ESS_F_ESS_SIGNING_CERT_V2_ADD, ERR_R_MALLOC_FAILURE);
goto err;
}
OPENSSL_free(pp);
pp = NULL;
return PKCS7_add_signed_attribute(si,
NID_id_smime_aa_signingCertificateV2,
V_ASN1_SEQUENCE, seq);
err:
ASN1_STRING_free(seq);
OPENSSL_free(pp);
return 0;
}
static int ess_issuer_serial_cmp(const ESS_ISSUER_SERIAL *is, const X509 *cert)
{
GENERAL_NAME *issuer;
if (is == NULL || cert == NULL || sk_GENERAL_NAME_num(is->issuer) != 1)
return -1;
issuer = sk_GENERAL_NAME_value(is->issuer, 0);
if (issuer->type != GEN_DIRNAME
|| X509_NAME_cmp(issuer->d.dirn, X509_get_issuer_name(cert)) != 0)
return -1;
return ASN1_INTEGER_cmp(is->serial, X509_get0_serialNumber(cert));
}
/* Returns < 0 if certificate is not found, certificate index otherwise. */
int ess_find_cert(const STACK_OF(ESS_CERT_ID) *cert_ids, X509 *cert)
{
int i;
unsigned char cert_sha1[SHA_DIGEST_LENGTH];
if (cert_ids == NULL || cert == NULL)
return -1;
/* Recompute SHA1 hash of certificate if necessary (side effect). */
if (!x509v3_cache_extensions(cert))
return -1;
/* TODO(3.0): fetch sha1 algorithm from providers */
if (!X509_digest(cert, EVP_sha1(), cert_sha1, NULL))
return -1;
/* Look for cert in the cert_ids vector. */
for (i = 0; i < sk_ESS_CERT_ID_num(cert_ids); ++i) {
const ESS_CERT_ID *cid = sk_ESS_CERT_ID_value(cert_ids, i);
if (cid->hash->length == SHA_DIGEST_LENGTH
&& memcmp(cid->hash->data, cert_sha1, SHA_DIGEST_LENGTH) == 0) {
const ESS_ISSUER_SERIAL *is = cid->issuer_serial;
if (is == NULL || ess_issuer_serial_cmp(is, cert) == 0)
return i;
}
}
return -1;
}
/* Returns < 0 if certificate is not found, certificate index otherwise. */
int ess_find_cert_v2(const STACK_OF(ESS_CERT_ID_V2) *cert_ids, const X509 *cert)
{
int i;
unsigned char cert_digest[EVP_MAX_MD_SIZE];
unsigned int len;
/* Look for cert in the cert_ids vector. */
for (i = 0; i < sk_ESS_CERT_ID_V2_num(cert_ids); ++i) {
const ESS_CERT_ID_V2 *cid = sk_ESS_CERT_ID_V2_value(cert_ids, i);
const EVP_MD *md;
if (cid == NULL)
return -1;
if (cid->hash_alg != NULL)
md = EVP_get_digestbyobj(cid->hash_alg->algorithm);
else
md = EVP_sha256();
/* TODO(3.0): fetch sha1 algorithm from providers */
if (!X509_digest(cert, md, cert_digest, &len))
return -1;
if (cid->hash->length != (int)len)
return -1;
if (memcmp(cid->hash->data, cert_digest, cid->hash->length) == 0) {
const ESS_ISSUER_SERIAL *is = cid->issuer_serial;
if (is == NULL || ess_issuer_serial_cmp(is, cert) == 0)
return i;
}
}
return -1;
}
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