mirror of
https://github.com/DrKLO/Telegram.git
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159 lines
5.5 KiB
C
159 lines
5.5 KiB
C
/* 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/pkcs7.h>
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#include <openssl/bytestring.h>
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#include <openssl/err.h>
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#include <openssl/mem.h>
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#include <openssl/pool.h>
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#include <openssl/stack.h>
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#include "internal.h"
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#include "../bytestring/internal.h"
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// 1.2.840.113549.1.7.1
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static const uint8_t kPKCS7Data[] = {0x2a, 0x86, 0x48, 0x86, 0xf7,
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0x0d, 0x01, 0x07, 0x01};
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// 1.2.840.113549.1.7.2
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static const uint8_t kPKCS7SignedData[] = {0x2a, 0x86, 0x48, 0x86, 0xf7,
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0x0d, 0x01, 0x07, 0x02};
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// pkcs7_parse_header reads the non-certificate/non-CRL prefix of a PKCS#7
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// SignedData blob from |cbs| and sets |*out| to point to the rest of the
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// input. If the input is in BER format, then |*der_bytes| will be set to a
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// pointer that needs to be freed by the caller once they have finished
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// processing |*out| (which will be pointing into |*der_bytes|).
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//
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// It returns one on success or zero on error. On error, |*der_bytes| is
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// NULL.
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int pkcs7_parse_header(uint8_t **der_bytes, CBS *out, CBS *cbs) {
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CBS in, content_info, content_type, wrapped_signed_data, signed_data;
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uint64_t version;
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// The input may be in BER format.
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*der_bytes = NULL;
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if (!CBS_asn1_ber_to_der(cbs, &in, der_bytes) ||
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// See https://tools.ietf.org/html/rfc2315#section-7
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!CBS_get_asn1(&in, &content_info, CBS_ASN1_SEQUENCE) ||
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!CBS_get_asn1(&content_info, &content_type, CBS_ASN1_OBJECT)) {
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goto err;
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}
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if (!CBS_mem_equal(&content_type, kPKCS7SignedData,
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sizeof(kPKCS7SignedData))) {
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OPENSSL_PUT_ERROR(PKCS7, PKCS7_R_NOT_PKCS7_SIGNED_DATA);
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goto err;
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}
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// See https://tools.ietf.org/html/rfc2315#section-9.1
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if (!CBS_get_asn1(&content_info, &wrapped_signed_data,
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CBS_ASN1_CONTEXT_SPECIFIC | CBS_ASN1_CONSTRUCTED | 0) ||
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!CBS_get_asn1(&wrapped_signed_data, &signed_data, CBS_ASN1_SEQUENCE) ||
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!CBS_get_asn1_uint64(&signed_data, &version) ||
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!CBS_get_asn1(&signed_data, NULL /* digests */, CBS_ASN1_SET) ||
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!CBS_get_asn1(&signed_data, NULL /* content */, CBS_ASN1_SEQUENCE)) {
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goto err;
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}
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if (version < 1) {
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OPENSSL_PUT_ERROR(PKCS7, PKCS7_R_BAD_PKCS7_VERSION);
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goto err;
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}
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CBS_init(out, CBS_data(&signed_data), CBS_len(&signed_data));
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return 1;
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err:
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OPENSSL_free(*der_bytes);
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*der_bytes = NULL;
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return 0;
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}
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int PKCS7_get_raw_certificates(STACK_OF(CRYPTO_BUFFER) *out_certs, CBS *cbs,
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CRYPTO_BUFFER_POOL *pool) {
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CBS signed_data, certificates;
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uint8_t *der_bytes = NULL;
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int ret = 0, has_certificates;
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const size_t initial_certs_len = sk_CRYPTO_BUFFER_num(out_certs);
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// See https://tools.ietf.org/html/rfc2315#section-9.1
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if (!pkcs7_parse_header(&der_bytes, &signed_data, cbs) ||
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!CBS_get_optional_asn1(
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&signed_data, &certificates, &has_certificates,
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CBS_ASN1_CONTEXT_SPECIFIC | CBS_ASN1_CONSTRUCTED | 0)) {
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goto err;
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}
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if (!has_certificates) {
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CBS_init(&certificates, NULL, 0);
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}
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while (CBS_len(&certificates) > 0) {
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CBS cert;
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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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CRYPTO_BUFFER *buf = CRYPTO_BUFFER_new_from_CBS(&cert, pool);
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if (buf == NULL ||
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!sk_CRYPTO_BUFFER_push(out_certs, buf)) {
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CRYPTO_BUFFER_free(buf);
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goto err;
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}
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}
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ret = 1;
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err:
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OPENSSL_free(der_bytes);
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if (!ret) {
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while (sk_CRYPTO_BUFFER_num(out_certs) != initial_certs_len) {
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CRYPTO_BUFFER *buf = sk_CRYPTO_BUFFER_pop(out_certs);
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CRYPTO_BUFFER_free(buf);
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}
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}
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return ret;
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}
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int pkcs7_bundle(CBB *out, int (*cb)(CBB *out, const void *arg),
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const void *arg) {
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CBB outer_seq, oid, wrapped_seq, seq, version_bytes, digest_algos_set,
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content_info, signer_infos;
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// See https://tools.ietf.org/html/rfc2315#section-7
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if (!CBB_add_asn1(out, &outer_seq, CBS_ASN1_SEQUENCE) ||
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!CBB_add_asn1(&outer_seq, &oid, CBS_ASN1_OBJECT) ||
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!CBB_add_bytes(&oid, kPKCS7SignedData, sizeof(kPKCS7SignedData)) ||
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!CBB_add_asn1(&outer_seq, &wrapped_seq,
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CBS_ASN1_CONTEXT_SPECIFIC | CBS_ASN1_CONSTRUCTED | 0) ||
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// See https://tools.ietf.org/html/rfc2315#section-9.1
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!CBB_add_asn1(&wrapped_seq, &seq, CBS_ASN1_SEQUENCE) ||
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!CBB_add_asn1(&seq, &version_bytes, CBS_ASN1_INTEGER) ||
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!CBB_add_u8(&version_bytes, 1) ||
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!CBB_add_asn1(&seq, &digest_algos_set, CBS_ASN1_SET) ||
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!CBB_add_asn1(&seq, &content_info, CBS_ASN1_SEQUENCE) ||
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!CBB_add_asn1(&content_info, &oid, CBS_ASN1_OBJECT) ||
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!CBB_add_bytes(&oid, kPKCS7Data, sizeof(kPKCS7Data)) ||
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!cb(&seq, arg) ||
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!CBB_add_asn1(&seq, &signer_infos, CBS_ASN1_SET)) {
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return 0;
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}
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return CBB_flush(out);
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}
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