98 lines
3.1 KiB
C
98 lines
3.1 KiB
C
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/* Copyright (c) 2014, Google Inc.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
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#include <openssl/x509.h>
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#include <openssl/bytestring.h>
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#include <openssl/err.h>
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#include <openssl/obj.h>
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#include <openssl/stack.h>
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int PKCS7_get_certificates(STACK_OF(X509) *out_certs, CBS *cbs) {
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/* See https://tools.ietf.org/html/rfc2315#section-9.1 */
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CBS content_info, content_type, wrapped_signed_data, signed_data,
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version_bytes, certificates;
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int nid;
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const size_t initial_certs_len = sk_X509_num(out_certs);
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if (!CBS_get_asn1_ber(cbs, &content_info, CBS_ASN1_SEQUENCE) ||
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!CBS_get_asn1(&content_info, &content_type, CBS_ASN1_OBJECT)) {
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return 0;
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}
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nid = OBJ_cbs2nid(&content_type);
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if (nid != NID_pkcs7_signed) {
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OPENSSL_PUT_ERROR(X509, PKCS7_get_certificates,
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X509_R_NOT_PKCS7_SIGNED_DATA);
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return 0;
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}
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if (!CBS_get_asn1_ber(&content_info, &wrapped_signed_data,
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CBS_ASN1_CONTEXT_SPECIFIC | CBS_ASN1_CONSTRUCTED | 0) ||
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!CBS_get_asn1_ber(&wrapped_signed_data, &signed_data,
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CBS_ASN1_SEQUENCE) ||
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!CBS_get_asn1_ber(&signed_data, &version_bytes, CBS_ASN1_INTEGER) ||
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!CBS_get_asn1_ber(&signed_data, NULL /* digests */, CBS_ASN1_SET) ||
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!CBS_get_asn1_ber(&signed_data, NULL /* content */, CBS_ASN1_SEQUENCE)) {
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return 0;
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}
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if (CBS_len(&version_bytes) < 1 || CBS_data(&version_bytes)[0] == 0) {
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OPENSSL_PUT_ERROR(X509, PKCS7_get_certificates,
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X509_R_BAD_PKCS7_VERSION);
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return 0;
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}
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if (!CBS_get_asn1_ber(&signed_data, &certificates,
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CBS_ASN1_CONTEXT_SPECIFIC | CBS_ASN1_CONSTRUCTED | 0)) {
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OPENSSL_PUT_ERROR(X509, PKCS7_get_certificates,
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X509_R_NO_CERTIFICATES_INCLUDED);
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return 0;
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}
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while (CBS_len(&certificates) > 0) {
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CBS cert;
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X509 *x509;
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const uint8_t *inp;
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if (!CBS_get_asn1_element(&certificates, &cert, CBS_ASN1_SEQUENCE)) {
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goto err;
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}
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inp = CBS_data(&cert);
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x509 = d2i_X509(NULL, &inp, CBS_len(&cert));
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if (!x509) {
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goto err;
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}
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if (inp != CBS_data(&cert) + CBS_len(&cert)) {
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/* This suggests a disconnect between the two ASN.1 parsers. */
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goto err;
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}
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sk_X509_push(out_certs, x509);
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}
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return 1;
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err:
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while (sk_X509_num(out_certs) != initial_certs_len) {
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X509 *x509 = sk_X509_pop(out_certs);
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X509_free(x509);
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}
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return 0;
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}
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