|
- /* Copyright (c) 2014, 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 <openssl/bytestring.h>
- #include <openssl/err.h>
- #include <openssl/mem.h>
- #include <openssl/pool.h>
- #include <openssl/stack.h>
-
- #include "internal.h"
- #include "../bytestring/internal.h"
-
-
- // 1.2.840.113549.1.7.1
- static const uint8_t kPKCS7Data[] = {0x2a, 0x86, 0x48, 0x86, 0xf7,
- 0x0d, 0x01, 0x07, 0x01};
-
- // 1.2.840.113549.1.7.2
- static const uint8_t kPKCS7SignedData[] = {0x2a, 0x86, 0x48, 0x86, 0xf7,
- 0x0d, 0x01, 0x07, 0x02};
-
- // pkcs7_parse_header reads the non-certificate/non-CRL prefix of a PKCS#7
- // SignedData blob from |cbs| and sets |*out| to point to the rest of the
- // input. If the input is in BER format, then |*der_bytes| will be set to a
- // pointer that needs to be freed by the caller once they have finished
- // processing |*out| (which will be pointing into |*der_bytes|).
- //
- // It returns one on success or zero on error. On error, |*der_bytes| is
- // NULL.
- int pkcs7_parse_header(uint8_t **der_bytes, CBS *out, CBS *cbs) {
- CBS in, content_info, content_type, wrapped_signed_data, signed_data;
- uint64_t version;
-
- // The input may be in BER format.
- *der_bytes = NULL;
- if (!CBS_asn1_ber_to_der(cbs, &in, der_bytes) ||
- // See https://tools.ietf.org/html/rfc2315#section-7
- !CBS_get_asn1(&in, &content_info, CBS_ASN1_SEQUENCE) ||
- !CBS_get_asn1(&content_info, &content_type, CBS_ASN1_OBJECT)) {
- goto err;
- }
-
- if (!CBS_mem_equal(&content_type, kPKCS7SignedData,
- sizeof(kPKCS7SignedData))) {
- OPENSSL_PUT_ERROR(PKCS7, PKCS7_R_NOT_PKCS7_SIGNED_DATA);
- goto err;
- }
-
- // See https://tools.ietf.org/html/rfc2315#section-9.1
- if (!CBS_get_asn1(&content_info, &wrapped_signed_data,
- CBS_ASN1_CONTEXT_SPECIFIC | CBS_ASN1_CONSTRUCTED | 0) ||
- !CBS_get_asn1(&wrapped_signed_data, &signed_data, CBS_ASN1_SEQUENCE) ||
- !CBS_get_asn1_uint64(&signed_data, &version) ||
- !CBS_get_asn1(&signed_data, NULL /* digests */, CBS_ASN1_SET) ||
- !CBS_get_asn1(&signed_data, NULL /* content */, CBS_ASN1_SEQUENCE)) {
- goto err;
- }
-
- if (version < 1) {
- OPENSSL_PUT_ERROR(PKCS7, PKCS7_R_BAD_PKCS7_VERSION);
- goto err;
- }
-
- CBS_init(out, CBS_data(&signed_data), CBS_len(&signed_data));
- return 1;
-
- err:
- OPENSSL_free(*der_bytes);
- *der_bytes = NULL;
- return 0;
- }
-
- int PKCS7_get_raw_certificates(STACK_OF(CRYPTO_BUFFER) *out_certs, CBS *cbs,
- CRYPTO_BUFFER_POOL *pool) {
- CBS signed_data, certificates;
- uint8_t *der_bytes = NULL;
- int ret = 0, has_certificates;
- const size_t initial_certs_len = sk_CRYPTO_BUFFER_num(out_certs);
-
- // See https://tools.ietf.org/html/rfc2315#section-9.1
- if (!pkcs7_parse_header(&der_bytes, &signed_data, cbs) ||
- !CBS_get_optional_asn1(
- &signed_data, &certificates, &has_certificates,
- CBS_ASN1_CONTEXT_SPECIFIC | CBS_ASN1_CONSTRUCTED | 0)) {
- goto err;
- }
-
- if (!has_certificates) {
- CBS_init(&certificates, NULL, 0);
- }
-
- while (CBS_len(&certificates) > 0) {
- CBS cert;
- if (!CBS_get_asn1_element(&certificates, &cert, CBS_ASN1_SEQUENCE)) {
- goto err;
- }
-
- CRYPTO_BUFFER *buf = CRYPTO_BUFFER_new_from_CBS(&cert, pool);
- if (buf == NULL ||
- !sk_CRYPTO_BUFFER_push(out_certs, buf)) {
- CRYPTO_BUFFER_free(buf);
- goto err;
- }
- }
-
- ret = 1;
-
- err:
- OPENSSL_free(der_bytes);
-
- if (!ret) {
- while (sk_CRYPTO_BUFFER_num(out_certs) != initial_certs_len) {
- CRYPTO_BUFFER *buf = sk_CRYPTO_BUFFER_pop(out_certs);
- CRYPTO_BUFFER_free(buf);
- }
- }
-
- return ret;
- }
-
- int pkcs7_bundle(CBB *out, int (*cb)(CBB *out, const void *arg),
- const void *arg) {
- CBB outer_seq, oid, wrapped_seq, seq, version_bytes, digest_algos_set,
- content_info;
-
- // See https://tools.ietf.org/html/rfc2315#section-7
- if (!CBB_add_asn1(out, &outer_seq, CBS_ASN1_SEQUENCE) ||
- !CBB_add_asn1(&outer_seq, &oid, CBS_ASN1_OBJECT) ||
- !CBB_add_bytes(&oid, kPKCS7SignedData, sizeof(kPKCS7SignedData)) ||
- !CBB_add_asn1(&outer_seq, &wrapped_seq,
- CBS_ASN1_CONTEXT_SPECIFIC | CBS_ASN1_CONSTRUCTED | 0) ||
- // See https://tools.ietf.org/html/rfc2315#section-9.1
- !CBB_add_asn1(&wrapped_seq, &seq, CBS_ASN1_SEQUENCE) ||
- !CBB_add_asn1(&seq, &version_bytes, CBS_ASN1_INTEGER) ||
- !CBB_add_u8(&version_bytes, 1) ||
- !CBB_add_asn1(&seq, &digest_algos_set, CBS_ASN1_SET) ||
- !CBB_add_asn1(&seq, &content_info, CBS_ASN1_SEQUENCE) ||
- !CBB_add_asn1(&content_info, &oid, CBS_ASN1_OBJECT) ||
- !CBB_add_bytes(&oid, kPKCS7Data, sizeof(kPKCS7Data)) ||
- !cb(&seq, arg)) {
- return 0;
- }
-
- return CBB_flush(out);
- }
|