blob: 7bc39d27d0c4dec48b33b9e4e3e89b0d6ac2e179 [file] [log] [blame]
/* Copyright (c) 2017, Google Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
#include <openssl/pkcs7.h>
#include <assert.h>
#include <limits.h>
#include <openssl/bytestring.h>
#include <openssl/err.h>
#include <openssl/mem.h>
#include <openssl/pem.h>
#include <openssl/pool.h>
#include <openssl/stack.h>
#include <openssl/x509.h>
#include "internal.h"
int PKCS7_get_certificates(STACK_OF(X509) *out_certs, CBS *cbs) {
int ret = 0;
const size_t initial_certs_len = sk_X509_num(out_certs);
STACK_OF(CRYPTO_BUFFER) *raw = sk_CRYPTO_BUFFER_new_null();
if (raw == NULL ||
!PKCS7_get_raw_certificates(raw, cbs, NULL)) {
goto err;
}
for (size_t i = 0; i < sk_CRYPTO_BUFFER_num(raw); i++) {
CRYPTO_BUFFER *buf = sk_CRYPTO_BUFFER_value(raw, i);
X509 *x509 = X509_parse_from_buffer(buf);
if (x509 == NULL ||
!sk_X509_push(out_certs, x509)) {
X509_free(x509);
goto err;
}
}
ret = 1;
err:
sk_CRYPTO_BUFFER_pop_free(raw, CRYPTO_BUFFER_free);
if (!ret) {
while (sk_X509_num(out_certs) != initial_certs_len) {
X509 *x509 = sk_X509_pop(out_certs);
X509_free(x509);
}
}
return ret;
}
int PKCS7_get_CRLs(STACK_OF(X509_CRL) *out_crls, CBS *cbs) {
CBS signed_data, crls;
uint8_t *der_bytes = NULL;
int ret = 0;
const size_t initial_crls_len = sk_X509_CRL_num(out_crls);
if (!pkcs7_parse_header(&der_bytes, &signed_data, cbs)) {
return 0;
}
// See https://tools.ietf.org/html/rfc2315#section-9.1
// Even if only CRLs are included, there may be an empty certificates block.
// OpenSSL does this, for example.
if (CBS_peek_asn1_tag(&signed_data,
CBS_ASN1_CONTEXT_SPECIFIC | CBS_ASN1_CONSTRUCTED | 0) &&
!CBS_get_asn1(&signed_data, NULL /* certificates */,
CBS_ASN1_CONTEXT_SPECIFIC | CBS_ASN1_CONSTRUCTED | 0)) {
goto err;
}
if (!CBS_get_asn1(&signed_data, &crls,
CBS_ASN1_CONTEXT_SPECIFIC | CBS_ASN1_CONSTRUCTED | 1)) {
OPENSSL_PUT_ERROR(PKCS7, PKCS7_R_NO_CRLS_INCLUDED);
goto err;
}
while (CBS_len(&crls) > 0) {
CBS crl_data;
X509_CRL *crl;
const uint8_t *inp;
if (!CBS_get_asn1_element(&crls, &crl_data, CBS_ASN1_SEQUENCE)) {
goto err;
}
if (CBS_len(&crl_data) > LONG_MAX) {
goto err;
}
inp = CBS_data(&crl_data);
crl = d2i_X509_CRL(NULL, &inp, (long)CBS_len(&crl_data));
if (!crl) {
goto err;
}
assert(inp == CBS_data(&crl_data) + CBS_len(&crl_data));
if (sk_X509_CRL_push(out_crls, crl) == 0) {
X509_CRL_free(crl);
goto err;
}
}
ret = 1;
err:
OPENSSL_free(der_bytes);
if (!ret) {
while (sk_X509_CRL_num(out_crls) != initial_crls_len) {
X509_CRL_free(sk_X509_CRL_pop(out_crls));
}
}
return ret;
}
int PKCS7_get_PEM_certificates(STACK_OF(X509) *out_certs, BIO *pem_bio) {
uint8_t *data;
long len;
int ret;
// Even though we pass PEM_STRING_PKCS7 as the expected PEM type here, PEM
// internally will actually allow several other values too, including
// "CERTIFICATE".
if (!PEM_bytes_read_bio(&data, &len, NULL /* PEM type output */,
PEM_STRING_PKCS7, pem_bio,
NULL /* password callback */,
NULL /* password callback argument */)) {
return 0;
}
CBS cbs;
CBS_init(&cbs, data, len);
ret = PKCS7_get_certificates(out_certs, &cbs);
OPENSSL_free(data);
return ret;
}
int PKCS7_get_PEM_CRLs(STACK_OF(X509_CRL) *out_crls, BIO *pem_bio) {
uint8_t *data;
long len;
int ret;
// Even though we pass PEM_STRING_PKCS7 as the expected PEM type here, PEM
// internally will actually allow several other values too, including
// "CERTIFICATE".
if (!PEM_bytes_read_bio(&data, &len, NULL /* PEM type output */,
PEM_STRING_PKCS7, pem_bio,
NULL /* password callback */,
NULL /* password callback argument */)) {
return 0;
}
CBS cbs;
CBS_init(&cbs, data, len);
ret = PKCS7_get_CRLs(out_crls, &cbs);
OPENSSL_free(data);
return ret;
}
static int pkcs7_bundle_certificates_cb(CBB *out, const void *arg) {
const STACK_OF(X509) *certs = arg;
size_t i;
CBB certificates;
// See https://tools.ietf.org/html/rfc2315#section-9.1
if (!CBB_add_asn1(out, &certificates,
CBS_ASN1_CONTEXT_SPECIFIC | CBS_ASN1_CONSTRUCTED | 0)) {
return 0;
}
for (i = 0; i < sk_X509_num(certs); i++) {
X509 *x509 = sk_X509_value(certs, i);
uint8_t *buf;
int len = i2d_X509(x509, NULL);
if (len < 0 ||
!CBB_add_space(&certificates, &buf, len) ||
i2d_X509(x509, &buf) < 0) {
return 0;
}
}
return CBB_flush(out);
}
int PKCS7_bundle_certificates(CBB *out, const STACK_OF(X509) *certs) {
return pkcs7_bundle(out, pkcs7_bundle_certificates_cb, certs);
}
static int pkcs7_bundle_crls_cb(CBB *out, const void *arg) {
const STACK_OF(X509_CRL) *crls = arg;
size_t i;
CBB crl_data;
// See https://tools.ietf.org/html/rfc2315#section-9.1
if (!CBB_add_asn1(out, &crl_data,
CBS_ASN1_CONTEXT_SPECIFIC | CBS_ASN1_CONSTRUCTED | 1)) {
return 0;
}
for (i = 0; i < sk_X509_CRL_num(crls); i++) {
X509_CRL *crl = sk_X509_CRL_value(crls, i);
uint8_t *buf;
int len = i2d_X509_CRL(crl, NULL);
if (len < 0 ||
!CBB_add_space(&crl_data, &buf, len) ||
i2d_X509_CRL(crl, &buf) < 0) {
return 0;
}
}
return CBB_flush(out);
}
int PKCS7_bundle_CRLs(CBB *out, const STACK_OF(X509_CRL) *crls) {
return pkcs7_bundle(out, pkcs7_bundle_crls_cb, crls);
}