| /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
| * All rights reserved. |
| * |
| * This package is an SSL implementation written |
| * by Eric Young (eay@cryptsoft.com). |
| * The implementation was written so as to conform with Netscapes SSL. |
| * |
| * This library is free for commercial and non-commercial use as long as |
| * the following conditions are aheared to. The following conditions |
| * apply to all code found in this distribution, be it the RC4, RSA, |
| * lhash, DES, etc., code; not just the SSL code. The SSL documentation |
| * included with this distribution is covered by the same copyright terms |
| * except that the holder is Tim Hudson (tjh@cryptsoft.com). |
| * |
| * Copyright remains Eric Young's, and as such any Copyright notices in |
| * the code are not to be removed. |
| * If this package is used in a product, Eric Young should be given attribution |
| * as the author of the parts of the library used. |
| * This can be in the form of a textual message at program startup or |
| * in documentation (online or textual) provided with the package. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. All advertising materials mentioning features or use of this software |
| * must display the following acknowledgement: |
| * "This product includes cryptographic software written by |
| * Eric Young (eay@cryptsoft.com)" |
| * The word 'cryptographic' can be left out if the rouines from the library |
| * being used are not cryptographic related :-). |
| * 4. If you include any Windows specific code (or a derivative thereof) from |
| * the apps directory (application code) you must include an acknowledgement: |
| * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
| * |
| * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * |
| * The licence and distribution terms for any publically available version or |
| * derivative of this code cannot be changed. i.e. this code cannot simply be |
| * copied and put under another distribution licence |
| * [including the GNU Public Licence.] |
| */ |
| /* ==================================================================== |
| * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * 3. All advertising materials mentioning features or use of this |
| * software must display the following acknowledgment: |
| * "This product includes software developed by the OpenSSL Project |
| * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" |
| * |
| * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
| * endorse or promote products derived from this software without |
| * prior written permission. For written permission, please contact |
| * openssl-core@openssl.org. |
| * |
| * 5. Products derived from this software may not be called "OpenSSL" |
| * nor may "OpenSSL" appear in their names without prior written |
| * permission of the OpenSSL Project. |
| * |
| * 6. Redistributions of any form whatsoever must retain the following |
| * acknowledgment: |
| * "This product includes software developed by the OpenSSL Project |
| * for use in the OpenSSL Toolkit (http://www.openssl.org/)" |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY |
| * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR |
| * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
| * OF THE POSSIBILITY OF SUCH DAMAGE. |
| * ==================================================================== |
| * |
| * This product includes cryptographic software written by Eric Young |
| * (eay@cryptsoft.com). This product includes software written by Tim |
| * Hudson (tjh@cryptsoft.com). |
| * |
| */ |
| /* ==================================================================== |
| * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. |
| * ECC cipher suite support in OpenSSL originally developed by |
| * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project. */ |
| |
| #include <openssl/ssl.h> |
| |
| #include <assert.h> |
| #include <limits.h> |
| #include <string.h> |
| |
| #include <utility> |
| |
| #include <openssl/bn.h> |
| #include <openssl/bytestring.h> |
| #include <openssl/ec_key.h> |
| #include <openssl/err.h> |
| #include <openssl/mem.h> |
| #include <openssl/sha.h> |
| #include <openssl/x509.h> |
| |
| #include "../crypto/internal.h" |
| #include "internal.h" |
| |
| |
| BSSL_NAMESPACE_BEGIN |
| |
| CERT::CERT(const SSL_X509_METHOD *x509_method_arg) |
| : x509_method(x509_method_arg) {} |
| |
| CERT::~CERT() { |
| ssl_cert_clear_certs(this); |
| x509_method->cert_free(this); |
| } |
| |
| static CRYPTO_BUFFER *buffer_up_ref(const CRYPTO_BUFFER *buffer) { |
| CRYPTO_BUFFER_up_ref(const_cast<CRYPTO_BUFFER *>(buffer)); |
| return const_cast<CRYPTO_BUFFER *>(buffer); |
| } |
| |
| UniquePtr<CERT> ssl_cert_dup(CERT *cert) { |
| UniquePtr<CERT> ret = MakeUnique<CERT>(cert->x509_method); |
| if (!ret) { |
| return nullptr; |
| } |
| |
| if (cert->chain) { |
| ret->chain.reset(sk_CRYPTO_BUFFER_deep_copy( |
| cert->chain.get(), buffer_up_ref, CRYPTO_BUFFER_free)); |
| if (!ret->chain) { |
| return nullptr; |
| } |
| } |
| |
| ret->privatekey = UpRef(cert->privatekey); |
| ret->key_method = cert->key_method; |
| |
| if (!ret->sigalgs.CopyFrom(cert->sigalgs)) { |
| return nullptr; |
| } |
| |
| ret->cert_cb = cert->cert_cb; |
| ret->cert_cb_arg = cert->cert_cb_arg; |
| |
| ret->x509_method->cert_dup(ret.get(), cert); |
| |
| ret->signed_cert_timestamp_list = UpRef(cert->signed_cert_timestamp_list); |
| ret->ocsp_response = UpRef(cert->ocsp_response); |
| |
| ret->sid_ctx_length = cert->sid_ctx_length; |
| OPENSSL_memcpy(ret->sid_ctx, cert->sid_ctx, sizeof(ret->sid_ctx)); |
| |
| if (cert->dc) { |
| ret->dc = cert->dc->Dup(); |
| if (!ret->dc) { |
| return nullptr; |
| } |
| } |
| |
| ret->dc_privatekey = UpRef(cert->dc_privatekey); |
| ret->dc_key_method = cert->dc_key_method; |
| |
| return ret; |
| } |
| |
| // Free up and clear all certificates and chains |
| void ssl_cert_clear_certs(CERT *cert) { |
| if (cert == NULL) { |
| return; |
| } |
| |
| cert->x509_method->cert_clear(cert); |
| |
| cert->chain.reset(); |
| cert->privatekey.reset(); |
| cert->key_method = nullptr; |
| |
| cert->dc.reset(); |
| cert->dc_privatekey.reset(); |
| cert->dc_key_method = nullptr; |
| } |
| |
| static void ssl_cert_set_cert_cb(CERT *cert, int (*cb)(SSL *ssl, void *arg), |
| void *arg) { |
| cert->cert_cb = cb; |
| cert->cert_cb_arg = arg; |
| } |
| |
| enum leaf_cert_and_privkey_result_t { |
| leaf_cert_and_privkey_error, |
| leaf_cert_and_privkey_ok, |
| leaf_cert_and_privkey_mismatch, |
| }; |
| |
| // check_leaf_cert_and_privkey checks whether the certificate in |leaf_buffer| |
| // and the private key in |privkey| are suitable and coherent. It returns |
| // |leaf_cert_and_privkey_error| and pushes to the error queue if a problem is |
| // found. If the certificate and private key are valid, but incoherent, it |
| // returns |leaf_cert_and_privkey_mismatch|. Otherwise it returns |
| // |leaf_cert_and_privkey_ok|. |
| static enum leaf_cert_and_privkey_result_t check_leaf_cert_and_privkey( |
| CRYPTO_BUFFER *leaf_buffer, EVP_PKEY *privkey) { |
| CBS cert_cbs; |
| CRYPTO_BUFFER_init_CBS(leaf_buffer, &cert_cbs); |
| UniquePtr<EVP_PKEY> pubkey = ssl_cert_parse_pubkey(&cert_cbs); |
| if (!pubkey) { |
| OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
| return leaf_cert_and_privkey_error; |
| } |
| |
| if (!ssl_is_key_type_supported(EVP_PKEY_id(pubkey.get()))) { |
| OPENSSL_PUT_ERROR(SSL, SSL_R_UNKNOWN_CERTIFICATE_TYPE); |
| return leaf_cert_and_privkey_error; |
| } |
| |
| // An ECC certificate may be usable for ECDH or ECDSA. We only support ECDSA |
| // certificates, so sanity-check the key usage extension. |
| if (EVP_PKEY_id(pubkey.get()) == EVP_PKEY_EC && |
| !ssl_cert_check_key_usage(&cert_cbs, key_usage_digital_signature)) { |
| OPENSSL_PUT_ERROR(SSL, SSL_R_UNKNOWN_CERTIFICATE_TYPE); |
| return leaf_cert_and_privkey_error; |
| } |
| |
| if (privkey != NULL && |
| // Sanity-check that the private key and the certificate match. |
| !ssl_compare_public_and_private_key(pubkey.get(), privkey)) { |
| ERR_clear_error(); |
| return leaf_cert_and_privkey_mismatch; |
| } |
| |
| return leaf_cert_and_privkey_ok; |
| } |
| |
| static int cert_set_chain_and_key( |
| CERT *cert, CRYPTO_BUFFER *const *certs, size_t num_certs, |
| EVP_PKEY *privkey, const SSL_PRIVATE_KEY_METHOD *privkey_method) { |
| if (num_certs == 0 || |
| (privkey == NULL && privkey_method == NULL)) { |
| OPENSSL_PUT_ERROR(SSL, ERR_R_PASSED_NULL_PARAMETER); |
| return 0; |
| } |
| |
| if (privkey != NULL && privkey_method != NULL) { |
| OPENSSL_PUT_ERROR(SSL, SSL_R_CANNOT_HAVE_BOTH_PRIVKEY_AND_METHOD); |
| return 0; |
| } |
| |
| switch (check_leaf_cert_and_privkey(certs[0], privkey)) { |
| case leaf_cert_and_privkey_error: |
| return 0; |
| case leaf_cert_and_privkey_mismatch: |
| OPENSSL_PUT_ERROR(SSL, SSL_R_CERTIFICATE_AND_PRIVATE_KEY_MISMATCH); |
| return 0; |
| case leaf_cert_and_privkey_ok: |
| break; |
| } |
| |
| UniquePtr<STACK_OF(CRYPTO_BUFFER)> certs_sk(sk_CRYPTO_BUFFER_new_null()); |
| if (!certs_sk) { |
| return 0; |
| } |
| |
| for (size_t i = 0; i < num_certs; i++) { |
| if (!PushToStack(certs_sk.get(), UpRef(certs[i]))) { |
| return 0; |
| } |
| } |
| |
| cert->privatekey = UpRef(privkey); |
| cert->key_method = privkey_method; |
| |
| cert->chain = std::move(certs_sk); |
| return 1; |
| } |
| |
| bool ssl_set_cert(CERT *cert, UniquePtr<CRYPTO_BUFFER> buffer) { |
| switch (check_leaf_cert_and_privkey(buffer.get(), cert->privatekey.get())) { |
| case leaf_cert_and_privkey_error: |
| return false; |
| case leaf_cert_and_privkey_mismatch: |
| // don't fail for a cert/key mismatch, just free current private key |
| // (when switching to a different cert & key, first this function should |
| // be used, then |ssl_set_pkey|. |
| cert->privatekey.reset(); |
| break; |
| case leaf_cert_and_privkey_ok: |
| break; |
| } |
| |
| cert->x509_method->cert_flush_cached_leaf(cert); |
| |
| if (cert->chain != nullptr) { |
| CRYPTO_BUFFER_free(sk_CRYPTO_BUFFER_value(cert->chain.get(), 0)); |
| sk_CRYPTO_BUFFER_set(cert->chain.get(), 0, buffer.release()); |
| return true; |
| } |
| |
| cert->chain.reset(sk_CRYPTO_BUFFER_new_null()); |
| if (cert->chain == nullptr) { |
| return false; |
| } |
| |
| if (!PushToStack(cert->chain.get(), std::move(buffer))) { |
| cert->chain.reset(); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| bool ssl_has_certificate(const SSL_HANDSHAKE *hs) { |
| return hs->config->cert->chain != nullptr && |
| sk_CRYPTO_BUFFER_value(hs->config->cert->chain.get(), 0) != nullptr && |
| ssl_has_private_key(hs); |
| } |
| |
| bool ssl_parse_cert_chain(uint8_t *out_alert, |
| UniquePtr<STACK_OF(CRYPTO_BUFFER)> *out_chain, |
| UniquePtr<EVP_PKEY> *out_pubkey, |
| uint8_t *out_leaf_sha256, CBS *cbs, |
| CRYPTO_BUFFER_POOL *pool) { |
| out_chain->reset(); |
| out_pubkey->reset(); |
| |
| CBS certificate_list; |
| if (!CBS_get_u24_length_prefixed(cbs, &certificate_list)) { |
| *out_alert = SSL_AD_DECODE_ERROR; |
| OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
| return false; |
| } |
| |
| if (CBS_len(&certificate_list) == 0) { |
| return true; |
| } |
| |
| UniquePtr<STACK_OF(CRYPTO_BUFFER)> chain(sk_CRYPTO_BUFFER_new_null()); |
| if (!chain) { |
| *out_alert = SSL_AD_INTERNAL_ERROR; |
| return false; |
| } |
| |
| UniquePtr<EVP_PKEY> pubkey; |
| while (CBS_len(&certificate_list) > 0) { |
| CBS certificate; |
| if (!CBS_get_u24_length_prefixed(&certificate_list, &certificate) || |
| CBS_len(&certificate) == 0) { |
| *out_alert = SSL_AD_DECODE_ERROR; |
| OPENSSL_PUT_ERROR(SSL, SSL_R_CERT_LENGTH_MISMATCH); |
| return false; |
| } |
| |
| if (sk_CRYPTO_BUFFER_num(chain.get()) == 0) { |
| pubkey = ssl_cert_parse_pubkey(&certificate); |
| if (!pubkey) { |
| *out_alert = SSL_AD_DECODE_ERROR; |
| return false; |
| } |
| |
| // Retain the hash of the leaf certificate if requested. |
| if (out_leaf_sha256 != NULL) { |
| SHA256(CBS_data(&certificate), CBS_len(&certificate), out_leaf_sha256); |
| } |
| } |
| |
| UniquePtr<CRYPTO_BUFFER> buf( |
| CRYPTO_BUFFER_new_from_CBS(&certificate, pool)); |
| if (!buf || |
| !PushToStack(chain.get(), std::move(buf))) { |
| *out_alert = SSL_AD_INTERNAL_ERROR; |
| return false; |
| } |
| } |
| |
| *out_chain = std::move(chain); |
| *out_pubkey = std::move(pubkey); |
| return true; |
| } |
| |
| bool ssl_add_cert_chain(SSL_HANDSHAKE *hs, CBB *cbb) { |
| if (!ssl_has_certificate(hs)) { |
| return CBB_add_u24(cbb, 0); |
| } |
| |
| CBB certs; |
| if (!CBB_add_u24_length_prefixed(cbb, &certs)) { |
| OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| return false; |
| } |
| |
| STACK_OF(CRYPTO_BUFFER) *chain = hs->config->cert->chain.get(); |
| for (size_t i = 0; i < sk_CRYPTO_BUFFER_num(chain); i++) { |
| CRYPTO_BUFFER *buffer = sk_CRYPTO_BUFFER_value(chain, i); |
| CBB child; |
| if (!CBB_add_u24_length_prefixed(&certs, &child) || |
| !CBB_add_bytes(&child, CRYPTO_BUFFER_data(buffer), |
| CRYPTO_BUFFER_len(buffer)) || |
| !CBB_flush(&certs)) { |
| OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| return false; |
| } |
| } |
| |
| return CBB_flush(cbb); |
| } |
| |
| // ssl_cert_skip_to_spki parses a DER-encoded, X.509 certificate from |in| and |
| // positions |*out_tbs_cert| to cover the TBSCertificate, starting at the |
| // subjectPublicKeyInfo. |
| static bool ssl_cert_skip_to_spki(const CBS *in, CBS *out_tbs_cert) { |
| /* From RFC 5280, section 4.1 |
| * Certificate ::= SEQUENCE { |
| * tbsCertificate TBSCertificate, |
| * signatureAlgorithm AlgorithmIdentifier, |
| * signatureValue BIT STRING } |
| |
| * TBSCertificate ::= SEQUENCE { |
| * version [0] EXPLICIT Version DEFAULT v1, |
| * serialNumber CertificateSerialNumber, |
| * signature AlgorithmIdentifier, |
| * issuer Name, |
| * validity Validity, |
| * subject Name, |
| * subjectPublicKeyInfo SubjectPublicKeyInfo, |
| * ... } */ |
| CBS buf = *in; |
| |
| CBS toplevel; |
| if (!CBS_get_asn1(&buf, &toplevel, CBS_ASN1_SEQUENCE) || |
| CBS_len(&buf) != 0 || |
| !CBS_get_asn1(&toplevel, out_tbs_cert, CBS_ASN1_SEQUENCE) || |
| // version |
| !CBS_get_optional_asn1( |
| out_tbs_cert, NULL, NULL, |
| CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 0) || |
| // serialNumber |
| !CBS_get_asn1(out_tbs_cert, NULL, CBS_ASN1_INTEGER) || |
| // signature algorithm |
| !CBS_get_asn1(out_tbs_cert, NULL, CBS_ASN1_SEQUENCE) || |
| // issuer |
| !CBS_get_asn1(out_tbs_cert, NULL, CBS_ASN1_SEQUENCE) || |
| // validity |
| !CBS_get_asn1(out_tbs_cert, NULL, CBS_ASN1_SEQUENCE) || |
| // subject |
| !CBS_get_asn1(out_tbs_cert, NULL, CBS_ASN1_SEQUENCE)) { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| UniquePtr<EVP_PKEY> ssl_cert_parse_pubkey(const CBS *in) { |
| CBS buf = *in, tbs_cert; |
| if (!ssl_cert_skip_to_spki(&buf, &tbs_cert)) { |
| OPENSSL_PUT_ERROR(SSL, SSL_R_CANNOT_PARSE_LEAF_CERT); |
| return nullptr; |
| } |
| |
| return UniquePtr<EVP_PKEY>(EVP_parse_public_key(&tbs_cert)); |
| } |
| |
| bool ssl_compare_public_and_private_key(const EVP_PKEY *pubkey, |
| const EVP_PKEY *privkey) { |
| if (EVP_PKEY_is_opaque(privkey)) { |
| // We cannot check an opaque private key and have to trust that it |
| // matches. |
| return true; |
| } |
| |
| switch (EVP_PKEY_cmp(pubkey, privkey)) { |
| case 1: |
| return true; |
| case 0: |
| OPENSSL_PUT_ERROR(X509, X509_R_KEY_VALUES_MISMATCH); |
| return false; |
| case -1: |
| OPENSSL_PUT_ERROR(X509, X509_R_KEY_TYPE_MISMATCH); |
| return false; |
| case -2: |
| OPENSSL_PUT_ERROR(X509, X509_R_UNKNOWN_KEY_TYPE); |
| return false; |
| } |
| |
| assert(0); |
| return false; |
| } |
| |
| bool ssl_cert_check_private_key(const CERT *cert, const EVP_PKEY *privkey) { |
| if (privkey == nullptr) { |
| OPENSSL_PUT_ERROR(SSL, SSL_R_NO_PRIVATE_KEY_ASSIGNED); |
| return false; |
| } |
| |
| if (cert->chain == nullptr || |
| sk_CRYPTO_BUFFER_value(cert->chain.get(), 0) == nullptr) { |
| OPENSSL_PUT_ERROR(SSL, SSL_R_NO_CERTIFICATE_ASSIGNED); |
| return false; |
| } |
| |
| CBS cert_cbs; |
| CRYPTO_BUFFER_init_CBS(sk_CRYPTO_BUFFER_value(cert->chain.get(), 0), |
| &cert_cbs); |
| UniquePtr<EVP_PKEY> pubkey = ssl_cert_parse_pubkey(&cert_cbs); |
| if (!pubkey) { |
| OPENSSL_PUT_ERROR(X509, X509_R_UNKNOWN_KEY_TYPE); |
| return false; |
| } |
| |
| return ssl_compare_public_and_private_key(pubkey.get(), privkey); |
| } |
| |
| bool ssl_cert_check_key_usage(const CBS *in, enum ssl_key_usage_t bit) { |
| CBS buf = *in; |
| |
| CBS tbs_cert, outer_extensions; |
| int has_extensions; |
| if (!ssl_cert_skip_to_spki(&buf, &tbs_cert) || |
| // subjectPublicKeyInfo |
| !CBS_get_asn1(&tbs_cert, NULL, CBS_ASN1_SEQUENCE) || |
| // issuerUniqueID |
| !CBS_get_optional_asn1(&tbs_cert, NULL, NULL, |
| CBS_ASN1_CONTEXT_SPECIFIC | 1) || |
| // subjectUniqueID |
| !CBS_get_optional_asn1(&tbs_cert, NULL, NULL, |
| CBS_ASN1_CONTEXT_SPECIFIC | 2) || |
| !CBS_get_optional_asn1( |
| &tbs_cert, &outer_extensions, &has_extensions, |
| CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 3)) { |
| OPENSSL_PUT_ERROR(SSL, SSL_R_CANNOT_PARSE_LEAF_CERT); |
| return false; |
| } |
| |
| if (!has_extensions) { |
| return true; |
| } |
| |
| CBS extensions; |
| if (!CBS_get_asn1(&outer_extensions, &extensions, CBS_ASN1_SEQUENCE)) { |
| OPENSSL_PUT_ERROR(SSL, SSL_R_CANNOT_PARSE_LEAF_CERT); |
| return false; |
| } |
| |
| while (CBS_len(&extensions) > 0) { |
| CBS extension, oid, contents; |
| if (!CBS_get_asn1(&extensions, &extension, CBS_ASN1_SEQUENCE) || |
| !CBS_get_asn1(&extension, &oid, CBS_ASN1_OBJECT) || |
| (CBS_peek_asn1_tag(&extension, CBS_ASN1_BOOLEAN) && |
| !CBS_get_asn1(&extension, NULL, CBS_ASN1_BOOLEAN)) || |
| !CBS_get_asn1(&extension, &contents, CBS_ASN1_OCTETSTRING) || |
| CBS_len(&extension) != 0) { |
| OPENSSL_PUT_ERROR(SSL, SSL_R_CANNOT_PARSE_LEAF_CERT); |
| return false; |
| } |
| |
| static const uint8_t kKeyUsageOID[3] = {0x55, 0x1d, 0x0f}; |
| if (CBS_len(&oid) != sizeof(kKeyUsageOID) || |
| OPENSSL_memcmp(CBS_data(&oid), kKeyUsageOID, sizeof(kKeyUsageOID)) != |
| 0) { |
| continue; |
| } |
| |
| CBS bit_string; |
| if (!CBS_get_asn1(&contents, &bit_string, CBS_ASN1_BITSTRING) || |
| CBS_len(&contents) != 0) { |
| OPENSSL_PUT_ERROR(SSL, SSL_R_CANNOT_PARSE_LEAF_CERT); |
| return false; |
| } |
| |
| // This is the KeyUsage extension. See |
| // https://tools.ietf.org/html/rfc5280#section-4.2.1.3 |
| if (!CBS_is_valid_asn1_bitstring(&bit_string)) { |
| OPENSSL_PUT_ERROR(SSL, SSL_R_CANNOT_PARSE_LEAF_CERT); |
| return false; |
| } |
| |
| if (!CBS_asn1_bitstring_has_bit(&bit_string, bit)) { |
| OPENSSL_PUT_ERROR(SSL, SSL_R_KEY_USAGE_BIT_INCORRECT); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| // No KeyUsage extension found. |
| return true; |
| } |
| |
| UniquePtr<STACK_OF(CRYPTO_BUFFER)> ssl_parse_client_CA_list(SSL *ssl, |
| uint8_t *out_alert, |
| CBS *cbs) { |
| CRYPTO_BUFFER_POOL *const pool = ssl->ctx->pool; |
| |
| UniquePtr<STACK_OF(CRYPTO_BUFFER)> ret(sk_CRYPTO_BUFFER_new_null()); |
| if (!ret) { |
| *out_alert = SSL_AD_INTERNAL_ERROR; |
| return nullptr; |
| } |
| |
| CBS child; |
| if (!CBS_get_u16_length_prefixed(cbs, &child)) { |
| *out_alert = SSL_AD_DECODE_ERROR; |
| OPENSSL_PUT_ERROR(SSL, SSL_R_LENGTH_MISMATCH); |
| return nullptr; |
| } |
| |
| while (CBS_len(&child) > 0) { |
| CBS distinguished_name; |
| if (!CBS_get_u16_length_prefixed(&child, &distinguished_name)) { |
| *out_alert = SSL_AD_DECODE_ERROR; |
| OPENSSL_PUT_ERROR(SSL, SSL_R_CA_DN_TOO_LONG); |
| return nullptr; |
| } |
| |
| UniquePtr<CRYPTO_BUFFER> buffer( |
| CRYPTO_BUFFER_new_from_CBS(&distinguished_name, pool)); |
| if (!buffer || |
| !PushToStack(ret.get(), std::move(buffer))) { |
| *out_alert = SSL_AD_INTERNAL_ERROR; |
| return nullptr; |
| } |
| } |
| |
| if (!ssl->ctx->x509_method->check_client_CA_list(ret.get())) { |
| *out_alert = SSL_AD_DECODE_ERROR; |
| OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
| return nullptr; |
| } |
| |
| return ret; |
| } |
| |
| bool ssl_has_client_CAs(const SSL_CONFIG *cfg) { |
| const STACK_OF(CRYPTO_BUFFER) *names = cfg->client_CA.get(); |
| if (names == nullptr) { |
| names = cfg->ssl->ctx->client_CA.get(); |
| } |
| if (names == nullptr) { |
| return false; |
| } |
| return sk_CRYPTO_BUFFER_num(names) > 0; |
| } |
| |
| bool ssl_add_client_CA_list(SSL_HANDSHAKE *hs, CBB *cbb) { |
| CBB child, name_cbb; |
| if (!CBB_add_u16_length_prefixed(cbb, &child)) { |
| return false; |
| } |
| |
| const STACK_OF(CRYPTO_BUFFER) *names = hs->config->client_CA.get(); |
| if (names == NULL) { |
| names = hs->ssl->ctx->client_CA.get(); |
| } |
| if (names == NULL) { |
| return CBB_flush(cbb); |
| } |
| |
| for (const CRYPTO_BUFFER *name : names) { |
| if (!CBB_add_u16_length_prefixed(&child, &name_cbb) || |
| !CBB_add_bytes(&name_cbb, CRYPTO_BUFFER_data(name), |
| CRYPTO_BUFFER_len(name))) { |
| return false; |
| } |
| } |
| |
| return CBB_flush(cbb); |
| } |
| |
| bool ssl_check_leaf_certificate(SSL_HANDSHAKE *hs, EVP_PKEY *pkey, |
| const CRYPTO_BUFFER *leaf) { |
| assert(ssl_protocol_version(hs->ssl) < TLS1_3_VERSION); |
| |
| // Check the certificate's type matches the cipher. |
| if (!(hs->new_cipher->algorithm_auth & ssl_cipher_auth_mask_for_key(pkey))) { |
| OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_CERTIFICATE_TYPE); |
| return false; |
| } |
| |
| if (EVP_PKEY_id(pkey) == EVP_PKEY_EC) { |
| // Check the key's group and point format are acceptable. |
| EC_KEY *ec_key = EVP_PKEY_get0_EC_KEY(pkey); |
| uint16_t group_id; |
| if (!ssl_nid_to_group_id( |
| &group_id, EC_GROUP_get_curve_name(EC_KEY_get0_group(ec_key))) || |
| !tls1_check_group_id(hs, group_id) || |
| EC_KEY_get_conv_form(ec_key) != POINT_CONVERSION_UNCOMPRESSED) { |
| OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_ECC_CERT); |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| bool ssl_on_certificate_selected(SSL_HANDSHAKE *hs) { |
| SSL *const ssl = hs->ssl; |
| if (!ssl_has_certificate(hs)) { |
| // Nothing to do. |
| return true; |
| } |
| |
| if (!ssl->ctx->x509_method->ssl_auto_chain_if_needed(hs)) { |
| return false; |
| } |
| |
| CBS leaf; |
| CRYPTO_BUFFER_init_CBS( |
| sk_CRYPTO_BUFFER_value(hs->config->cert->chain.get(), 0), &leaf); |
| |
| if (ssl_signing_with_dc(hs)) { |
| hs->local_pubkey = UpRef(hs->config->cert->dc->pkey); |
| } else { |
| hs->local_pubkey = ssl_cert_parse_pubkey(&leaf); |
| } |
| return hs->local_pubkey != NULL; |
| } |
| |
| |
| // Delegated credentials. |
| |
| DC::DC() = default; |
| DC::~DC() = default; |
| |
| UniquePtr<DC> DC::Dup() { |
| bssl::UniquePtr<DC> ret = MakeUnique<DC>(); |
| if (!ret) { |
| return nullptr; |
| } |
| |
| ret->raw = UpRef(raw); |
| ret->dc_cert_verify_algorithm = dc_cert_verify_algorithm; |
| ret->pkey = UpRef(pkey); |
| return ret; |
| } |
| |
| // static |
| UniquePtr<DC> DC::Parse(CRYPTO_BUFFER *in, uint8_t *out_alert) { |
| UniquePtr<DC> dc = MakeUnique<DC>(); |
| if (!dc) { |
| *out_alert = SSL_AD_INTERNAL_ERROR; |
| return nullptr; |
| } |
| |
| dc->raw = UpRef(in); |
| |
| CBS pubkey, deleg, sig; |
| uint32_t valid_time; |
| uint16_t algorithm; |
| CRYPTO_BUFFER_init_CBS(dc->raw.get(), &deleg); |
| if (!CBS_get_u32(&deleg, &valid_time) || |
| !CBS_get_u16(&deleg, &dc->dc_cert_verify_algorithm) || |
| !CBS_get_u24_length_prefixed(&deleg, &pubkey) || |
| !CBS_get_u16(&deleg, &algorithm) || |
| !CBS_get_u16_length_prefixed(&deleg, &sig) || |
| CBS_len(&deleg) != 0) { |
| OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
| *out_alert = SSL_AD_DECODE_ERROR; |
| return nullptr; |
| } |
| |
| dc->pkey.reset(EVP_parse_public_key(&pubkey)); |
| if (dc->pkey == nullptr) { |
| OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
| *out_alert = SSL_AD_DECODE_ERROR; |
| return nullptr; |
| } |
| |
| return dc; |
| } |
| |
| // ssl_can_serve_dc returns true if the host has configured a DC that it can |
| // serve in the handshake. Specifically, it checks that a DC has been |
| // configured and that the DC signature algorithm is supported by the peer. |
| static bool ssl_can_serve_dc(const SSL_HANDSHAKE *hs) { |
| // Check that a DC has been configured. |
| const CERT *cert = hs->config->cert.get(); |
| if (cert->dc == nullptr || |
| cert->dc->raw == nullptr || |
| (cert->dc_privatekey == nullptr && cert->dc_key_method == nullptr)) { |
| return false; |
| } |
| |
| // Check that 1.3 or higher has been negotiated. |
| const DC *dc = cert->dc.get(); |
| assert(hs->ssl->s3->have_version); |
| if (ssl_protocol_version(hs->ssl) < TLS1_3_VERSION) { |
| return false; |
| } |
| |
| // Check that the DC signature algorithm is supported by the peer. |
| Span<const uint16_t> peer_sigalgs = hs->peer_delegated_credential_sigalgs; |
| for (uint16_t peer_sigalg : peer_sigalgs) { |
| if (dc->dc_cert_verify_algorithm == peer_sigalg) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| bool ssl_signing_with_dc(const SSL_HANDSHAKE *hs) { |
| // We only support delegated credentials as a server. |
| return hs->ssl->server && |
| hs->delegated_credential_requested && |
| ssl_can_serve_dc(hs); |
| } |
| |
| static int cert_set_dc(CERT *cert, CRYPTO_BUFFER *const raw, EVP_PKEY *privkey, |
| const SSL_PRIVATE_KEY_METHOD *key_method) { |
| if (privkey == nullptr && key_method == nullptr) { |
| OPENSSL_PUT_ERROR(SSL, ERR_R_PASSED_NULL_PARAMETER); |
| return 0; |
| } |
| |
| if (privkey != nullptr && key_method != nullptr) { |
| OPENSSL_PUT_ERROR(SSL, SSL_R_CANNOT_HAVE_BOTH_PRIVKEY_AND_METHOD); |
| return 0; |
| } |
| |
| uint8_t alert; |
| UniquePtr<DC> dc = DC::Parse(raw, &alert); |
| if (dc == nullptr) { |
| OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_DELEGATED_CREDENTIAL); |
| return 0; |
| } |
| |
| if (privkey) { |
| // Check that the public and private keys match. |
| if (!ssl_compare_public_and_private_key(dc->pkey.get(), privkey)) { |
| OPENSSL_PUT_ERROR(SSL, SSL_R_CERTIFICATE_AND_PRIVATE_KEY_MISMATCH); |
| return 0; |
| } |
| } |
| |
| cert->dc = std::move(dc); |
| cert->dc_privatekey = UpRef(privkey); |
| cert->dc_key_method = key_method; |
| |
| return 1; |
| } |
| |
| BSSL_NAMESPACE_END |
| |
| using namespace bssl; |
| |
| int SSL_set_chain_and_key(SSL *ssl, CRYPTO_BUFFER *const *certs, |
| size_t num_certs, EVP_PKEY *privkey, |
| const SSL_PRIVATE_KEY_METHOD *privkey_method) { |
| if (!ssl->config) { |
| return 0; |
| } |
| return cert_set_chain_and_key(ssl->config->cert.get(), certs, num_certs, |
| privkey, privkey_method); |
| } |
| |
| int SSL_CTX_set_chain_and_key(SSL_CTX *ctx, CRYPTO_BUFFER *const *certs, |
| size_t num_certs, EVP_PKEY *privkey, |
| const SSL_PRIVATE_KEY_METHOD *privkey_method) { |
| return cert_set_chain_and_key(ctx->cert.get(), certs, num_certs, privkey, |
| privkey_method); |
| } |
| |
| const STACK_OF(CRYPTO_BUFFER) *SSL_CTX_get0_chain(const SSL_CTX *ctx) { |
| return ctx->cert->chain.get(); |
| } |
| |
| const STACK_OF(CRYPTO_BUFFER) *SSL_get0_chain(const SSL *ssl) { |
| if (!ssl->config) { |
| return nullptr; |
| } |
| return ssl->config->cert->chain.get(); |
| } |
| |
| int SSL_CTX_use_certificate_ASN1(SSL_CTX *ctx, size_t der_len, |
| const uint8_t *der) { |
| UniquePtr<CRYPTO_BUFFER> buffer(CRYPTO_BUFFER_new(der, der_len, NULL)); |
| if (!buffer) { |
| return 0; |
| } |
| |
| return ssl_set_cert(ctx->cert.get(), std::move(buffer)); |
| } |
| |
| int SSL_use_certificate_ASN1(SSL *ssl, const uint8_t *der, size_t der_len) { |
| UniquePtr<CRYPTO_BUFFER> buffer(CRYPTO_BUFFER_new(der, der_len, NULL)); |
| if (!buffer || !ssl->config) { |
| return 0; |
| } |
| |
| return ssl_set_cert(ssl->config->cert.get(), std::move(buffer)); |
| } |
| |
| void SSL_CTX_set_cert_cb(SSL_CTX *ctx, int (*cb)(SSL *ssl, void *arg), |
| void *arg) { |
| ssl_cert_set_cert_cb(ctx->cert.get(), cb, arg); |
| } |
| |
| void SSL_set_cert_cb(SSL *ssl, int (*cb)(SSL *ssl, void *arg), void *arg) { |
| if (!ssl->config) { |
| return; |
| } |
| ssl_cert_set_cert_cb(ssl->config->cert.get(), cb, arg); |
| } |
| |
| const STACK_OF(CRYPTO_BUFFER) *SSL_get0_peer_certificates(const SSL *ssl) { |
| SSL_SESSION *session = SSL_get_session(ssl); |
| if (session == NULL) { |
| return NULL; |
| } |
| |
| return session->certs.get(); |
| } |
| |
| const STACK_OF(CRYPTO_BUFFER) *SSL_get0_server_requested_CAs(const SSL *ssl) { |
| if (ssl->s3->hs == NULL) { |
| return NULL; |
| } |
| return ssl->s3->hs->ca_names.get(); |
| } |
| |
| static int set_signed_cert_timestamp_list(CERT *cert, const uint8_t *list, |
| size_t list_len) { |
| CBS sct_list; |
| CBS_init(&sct_list, list, list_len); |
| if (!ssl_is_sct_list_valid(&sct_list)) { |
| OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SCT_LIST); |
| return 0; |
| } |
| |
| cert->signed_cert_timestamp_list.reset( |
| CRYPTO_BUFFER_new(CBS_data(&sct_list), CBS_len(&sct_list), nullptr)); |
| return cert->signed_cert_timestamp_list != nullptr; |
| } |
| |
| int SSL_CTX_set_signed_cert_timestamp_list(SSL_CTX *ctx, const uint8_t *list, |
| size_t list_len) { |
| return set_signed_cert_timestamp_list(ctx->cert.get(), list, list_len); |
| } |
| |
| int SSL_set_signed_cert_timestamp_list(SSL *ssl, const uint8_t *list, |
| size_t list_len) { |
| if (!ssl->config) { |
| return 0; |
| } |
| return set_signed_cert_timestamp_list(ssl->config->cert.get(), list, |
| list_len); |
| } |
| |
| int SSL_CTX_set_ocsp_response(SSL_CTX *ctx, const uint8_t *response, |
| size_t response_len) { |
| ctx->cert->ocsp_response.reset( |
| CRYPTO_BUFFER_new(response, response_len, nullptr)); |
| return ctx->cert->ocsp_response != nullptr; |
| } |
| |
| int SSL_set_ocsp_response(SSL *ssl, const uint8_t *response, |
| size_t response_len) { |
| if (!ssl->config) { |
| return 0; |
| } |
| ssl->config->cert->ocsp_response.reset( |
| CRYPTO_BUFFER_new(response, response_len, nullptr)); |
| return ssl->config->cert->ocsp_response != nullptr; |
| } |
| |
| void SSL_CTX_set0_client_CAs(SSL_CTX *ctx, STACK_OF(CRYPTO_BUFFER) *name_list) { |
| ctx->x509_method->ssl_ctx_flush_cached_client_CA(ctx); |
| ctx->client_CA.reset(name_list); |
| } |
| |
| void SSL_set0_client_CAs(SSL *ssl, STACK_OF(CRYPTO_BUFFER) *name_list) { |
| if (!ssl->config) { |
| return; |
| } |
| ssl->ctx->x509_method->ssl_flush_cached_client_CA(ssl->config.get()); |
| ssl->config->client_CA.reset(name_list); |
| } |
| |
| int SSL_set1_delegated_credential(SSL *ssl, CRYPTO_BUFFER *dc, EVP_PKEY *pkey, |
| const SSL_PRIVATE_KEY_METHOD *key_method) { |
| if (!ssl->config) { |
| return 0; |
| } |
| |
| return cert_set_dc(ssl->config->cert.get(), dc, pkey, key_method); |
| } |
| |
| int SSL_delegated_credential_used(const SSL *ssl) { |
| return ssl->s3->delegated_credential_used; |
| } |