--- /dev/null
+/* 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) {
+ size_t der_len;
+ 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, der_bytes, &der_len)) {
+ return 0;
+ }
+ if (*der_bytes != NULL) {
+ CBS_init(&in, *der_bytes, der_len);
+ } else {
+ CBS_init(&in, CBS_data(cbs), CBS_len(cbs));
+ }
+
+ // See https://tools.ietf.org/html/rfc2315#section-7
+ if (!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;
+ const size_t initial_certs_len = sk_CRYPTO_BUFFER_num(out_certs);
+
+ if (!pkcs7_parse_header(&der_bytes, &signed_data, cbs)) {
+ return 0;
+ }
+
+ // See https://tools.ietf.org/html/rfc2315#section-9.1
+ if (!CBS_get_asn1(&signed_data, &certificates,
+ CBS_ASN1_CONTEXT_SPECIFIC | CBS_ASN1_CONSTRUCTED | 0)) {
+ OPENSSL_PUT_ERROR(PKCS7, PKCS7_R_NO_CERTIFICATES_INCLUDED);
+ goto err;
+ }
+
+ 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);
+}
git://repos.xcallymotion.com / motion2.git / blobdiff