diff options
Diffstat (limited to 'src/crypto/x509/pkcs7.c')
-rw-r--r-- | src/crypto/x509/pkcs7.c | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/src/crypto/x509/pkcs7.c b/src/crypto/x509/pkcs7.c new file mode 100644 index 0000000..75c101b --- /dev/null +++ b/src/crypto/x509/pkcs7.c @@ -0,0 +1,154 @@ +/* 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/x509.h> + +#include <openssl/bytestring.h> +#include <openssl/err.h> +#include <openssl/obj.h> +#include <openssl/stack.h> + +#include "../bytestring/internal.h" + + +int PKCS7_get_certificates(STACK_OF(X509) *out_certs, CBS *cbs) { + uint8_t *der_bytes = NULL; + size_t der_len; + CBS in, content_info, content_type, wrapped_signed_data, signed_data, + certificates; + const size_t initial_certs_len = sk_X509_num(out_certs); + uint64_t version; + int ret = 0; + + /* The input may be in BER format. */ + 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 (OBJ_cbs2nid(&content_type) != NID_pkcs7_signed) { + OPENSSL_PUT_ERROR(X509, PKCS7_get_certificates, + X509_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(X509, PKCS7_get_certificates, + X509_R_BAD_PKCS7_VERSION); + goto err; + } + + if (!CBS_get_asn1(&signed_data, &certificates, + CBS_ASN1_CONTEXT_SPECIFIC | CBS_ASN1_CONSTRUCTED | 0)) { + OPENSSL_PUT_ERROR(X509, PKCS7_get_certificates, + X509_R_NO_CERTIFICATES_INCLUDED); + goto err; + } + + while (CBS_len(&certificates) > 0) { + CBS cert; + X509 *x509; + const uint8_t *inp; + + if (!CBS_get_asn1_element(&certificates, &cert, CBS_ASN1_SEQUENCE)) { + goto err; + } + + inp = CBS_data(&cert); + x509 = d2i_X509(NULL, &inp, CBS_len(&cert)); + if (!x509) { + goto err; + } + + if (inp != CBS_data(&cert) + CBS_len(&cert)) { + /* This suggests a disconnect between the two ASN.1 parsers. */ + goto err; + } + + sk_X509_push(out_certs, x509); + } + + ret = 1; + +err: + if (der_bytes) { + OPENSSL_free(der_bytes); + } + + 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_bundle_certificates(CBB *out, const STACK_OF(X509) *certs) { + CBB outer_seq, wrapped_seq, seq, version_bytes, digest_algos_set, + content_info, certificates; + size_t i; + + /* See https://tools.ietf.org/html/rfc2315#section-7 */ + if (!CBB_add_asn1(out, &outer_seq, CBS_ASN1_SEQUENCE) || + !OBJ_nid2cbb(&outer_seq, NID_pkcs7_signed) || + !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) || + !OBJ_nid2cbb(&content_info, NID_pkcs7_data) || + !CBB_add_asn1(&seq, &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); +} |