BoringSSL as optional cryptobackend for ngtcp2

PR добавляет возможность использовать BoringSSL в ngtcp2 в качестве криптобиблиотеки. Для проектов в Аркадии, уже зависящих от ngtcp2, добавлена явная зависимость от слоя абстракции quictls (сейчас в транке ngtcp2 собирается с quictls).
commit_hash:3d6607abecfcff2157859acbdd18f9d0345ac485

1 files changed, 691 insertions, 0 deletions

diff --git a/contrib/restricted/google/boringssl/ssl/ssl_cert.cc b/contrib/restricted/google/boringssl/ssl/ssl_cert.cc
new file mode 100644
index 00000000000..e88f5d57e62
--- /dev/null
+++ b/contrib/restricted/google/boringssl/ssl/ssl_cert.cc
@@ -0,0 +1,691 @@
+/* Copyright (C) 1995-1998 Eric Young ([email protected])
+ * All rights reserved.
+ *
+ * This package is an SSL implementation written
+ * by Eric Young ([email protected]).
+ * 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 ([email protected]).
+ *
+ * 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 ([email protected])"
+ *    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 ([email protected])"
+ *
+ * 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
+ *    [email protected].
+ *
+ * 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
+ * ([email protected]).  This product includes software written by Tim
+ * Hudson ([email protected]).
+ *
+ */
+/* ====================================================================
+ * 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 <contrib/restricted/google/boringssl/include/openssl/ssl.h>
+
+#include <assert.h>
+#include <limits.h>
+#include <string.h>
+
+#include <utility>
+
+#include <contrib/restricted/google/boringssl/include/openssl/bn.h>
+#include <contrib/restricted/google/boringssl/include/openssl/bytestring.h>
+#include <contrib/restricted/google/boringssl/include/openssl/ec_key.h>
+#include <contrib/restricted/google/boringssl/include/openssl/err.h>
+#include <contrib/restricted/google/boringssl/include/openssl/mem.h>
+#include <contrib/restricted/google/boringssl/include/openssl/sha.h>
+#include <contrib/restricted/google/boringssl/include/openssl/x509.h>
+
+#include "../crypto/internal.h"
+#include "internal.h"
+
+
+BSSL_NAMESPACE_BEGIN
+
+CERT::CERT(const SSL_X509_METHOD *x509_method_arg)
+    : default_credential(MakeUnique<SSL_CREDENTIAL>(SSLCredentialType::kX509)),
+      x509_method(x509_method_arg) {}
+
+CERT::~CERT() { x509_method->cert_free(this); }
+
+UniquePtr<CERT> ssl_cert_dup(CERT *cert) {
+  UniquePtr<CERT> ret = MakeUnique<CERT>(cert->x509_method);
+  if (!ret) {
+    return nullptr;
+  }
+
+  // TODO(crbug.com/boringssl/431): This should just be |CopyFrom|.
+  for (const auto &cred : cert->credentials) {
+    if (!ret->credentials.Push(UpRef(cred))) {
+      return nullptr;
+    }
+  }
+
+  // |default_credential| is mutable, so it must be copied. We cannot simply
+  // bump the reference count.
+  ret->default_credential = cert->default_credential->Dup();
+  if (ret->default_credential == nullptr) {
+    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->sid_ctx_length = cert->sid_ctx_length;
+  OPENSSL_memcpy(ret->sid_ctx, cert->sid_ctx, sizeof(ret->sid_ctx));
+
+  return ret;
+}
+
+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;
+}
+
+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;
+  }
+
+  cert->default_credential->ClearCertAndKey();
+  if (!SSL_CREDENTIAL_set1_cert_chain(cert->default_credential.get(), certs,
+                                      num_certs)) {
+    return 0;
+  }
+
+  cert->x509_method->cert_flush_cached_leaf(cert);
+  cert->x509_method->cert_flush_cached_chain(cert);
+
+  return privkey != nullptr
+             ? SSL_CREDENTIAL_set1_private_key(cert->default_credential.get(),
+                                               privkey)
+             : SSL_CREDENTIAL_set_private_key_method(
+                   cert->default_credential.get(), privkey_method);
+}
+
+bool ssl_set_cert(CERT *cert, UniquePtr<CRYPTO_BUFFER> buffer) {
+  // Don't fail for a cert/key mismatch, just free the current private key.
+  // (When switching to a different keypair, the caller should switch the
+  // certificate, then the key.)
+  if (!cert->default_credential->SetLeafCert(
+          std::move(buffer), /*discard_key_on_mismatch=*/true)) {
+    return false;
+  }
+
+  cert->x509_method->cert_flush_cached_leaf(cert);
+  return true;
+}
+
+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;
+}
+
+// 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_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. This does not check key
+  // usage restrictions, which are handled separately.
+  //
+  // TODO(davidben): Put the key type and key usage checks in one place.
+  if (!(hs->new_cipher->algorithm_auth &
+        ssl_cipher_auth_mask_for_key(pkey, /*sign_ok=*/true))) {
+    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;
+}
+
+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);
+}
+
+void SSL_certs_clear(SSL *ssl) {
+  if (!ssl->config) {
+    return;
+  }
+
+  CERT *cert = ssl->config->cert.get();
+  cert->x509_method->cert_clear(cert);
+  cert->credentials.clear();
+  cert->default_credential->ClearCertAndKey();
+}
+
+const STACK_OF(CRYPTO_BUFFER) *SSL_CTX_get0_chain(const SSL_CTX *ctx) {
+  return ctx->cert->default_credential->chain.get();
+}
+
+const STACK_OF(CRYPTO_BUFFER) *SSL_get0_chain(const SSL *ssl) {
+  if (!ssl->config) {
+    return nullptr;
+  }
+  return ssl->config->cert->default_credential->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();
+}
+
+int SSL_CTX_set_signed_cert_timestamp_list(SSL_CTX *ctx, const uint8_t *list,
+                                           size_t list_len) {
+  UniquePtr<CRYPTO_BUFFER> buf(CRYPTO_BUFFER_new(list, list_len, nullptr));
+  return buf != nullptr && SSL_CREDENTIAL_set1_signed_cert_timestamp_list(
+                               ctx->cert->default_credential.get(), buf.get());
+}
+
+int SSL_set_signed_cert_timestamp_list(SSL *ssl, const uint8_t *list,
+                                       size_t list_len) {
+  if (!ssl->config) {
+    return 0;
+  }
+  UniquePtr<CRYPTO_BUFFER> buf(CRYPTO_BUFFER_new(list, list_len, nullptr));
+  return buf != nullptr &&
+         SSL_CREDENTIAL_set1_signed_cert_timestamp_list(
+             ssl->config->cert->default_credential.get(), buf.get());
+}
+
+int SSL_CTX_set_ocsp_response(SSL_CTX *ctx, const uint8_t *response,
+                              size_t response_len) {
+  UniquePtr<CRYPTO_BUFFER> buf(
+      CRYPTO_BUFFER_new(response, response_len, nullptr));
+  return buf != nullptr && SSL_CREDENTIAL_set1_ocsp_response(
+                               ctx->cert->default_credential.get(), buf.get());
+}
+
+int SSL_set_ocsp_response(SSL *ssl, const uint8_t *response,
+                          size_t response_len) {
+  if (!ssl->config) {
+    return 0;
+  }
+  UniquePtr<CRYPTO_BUFFER> buf(
+      CRYPTO_BUFFER_new(response, response_len, nullptr));
+  return buf != nullptr &&
+         SSL_CREDENTIAL_set1_ocsp_response(
+             ssl->config->cert->default_credential.get(), buf.get());
+}
+
+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);
+}