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/*
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file is distributed
* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
#include "api/s2n.h"
#include "error/s2n_errno.h"
#include "tls/s2n_auth_selection.h"
#include "tls/s2n_cipher_suites.h"
#include "tls/s2n_tls.h"
#include "utils/s2n_safety.h"
int s2n_server_cert_recv(struct s2n_connection *conn)
{
if (conn->actual_protocol_version == S2N_TLS13) {
uint8_t certificate_request_context_len;
POSIX_GUARD(s2n_stuffer_read_uint8(&conn->handshake.io, &certificate_request_context_len));
S2N_ERROR_IF(certificate_request_context_len != 0, S2N_ERR_BAD_MESSAGE);
}
uint32_t size_of_all_certificates;
POSIX_GUARD(s2n_stuffer_read_uint24(&conn->handshake.io, &size_of_all_certificates));
S2N_ERROR_IF(size_of_all_certificates > s2n_stuffer_data_available(&conn->handshake.io) || size_of_all_certificates < 3,
S2N_ERR_BAD_MESSAGE);
s2n_cert_public_key public_key;
POSIX_GUARD(s2n_pkey_zero_init(&public_key));
s2n_pkey_type actual_cert_pkey_type;
struct s2n_blob cert_chain = { 0 };
cert_chain.size = size_of_all_certificates;
cert_chain.data = s2n_stuffer_raw_read(&conn->handshake.io, size_of_all_certificates);
POSIX_ENSURE_REF(cert_chain.data);
POSIX_GUARD_RESULT(s2n_x509_validator_validate_cert_chain(&conn->x509_validator, conn, cert_chain.data,
cert_chain.size, &actual_cert_pkey_type, &public_key));
POSIX_GUARD(s2n_is_cert_type_valid_for_auth(conn, actual_cert_pkey_type));
POSIX_GUARD(s2n_pkey_setup_for_type(&public_key, actual_cert_pkey_type));
conn->handshake_params.server_public_key = public_key;
return 0;
}
int s2n_server_cert_send(struct s2n_connection *conn)
{
S2N_ERROR_IF(conn->handshake_params.our_chain_and_key == NULL, S2N_ERR_CERT_TYPE_UNSUPPORTED);
if (conn->actual_protocol_version == S2N_TLS13) {
/* server's certificate request context should always be of zero length */
/* https://tools.ietf.org/html/rfc8446#section-4.4.2 */
uint8_t certificate_request_context_len = 0;
POSIX_GUARD(s2n_stuffer_write_uint8(&conn->handshake.io, certificate_request_context_len));
}
POSIX_GUARD(s2n_send_cert_chain(conn, &conn->handshake.io, conn->handshake_params.our_chain_and_key));
return 0;
}
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