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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 <s2n.h>
#include "crypto/s2n_certificate.h"
#include "error/s2n_errno.h"
#include "tls/s2n_cipher_suites.h"
#include "tls/s2n_connection.h"
#include "tls/s2n_config.h"
#include "tls/s2n_tls.h"
#include "stuffer/s2n_stuffer.h"
#include "utils/s2n_blob.h"
#include "utils/s2n_safety.h"
int s2n_client_cert_recv(struct s2n_connection *conn)
{
if (conn->actual_protocol_version == S2N_TLS13) {
uint8_t certificate_request_context_len;
GUARD(s2n_stuffer_read_uint8(&conn->handshake.io, &certificate_request_context_len));
S2N_ERROR_IF(certificate_request_context_len != 0,S2N_ERR_BAD_MESSAGE);
}
struct s2n_stuffer *in = &conn->handshake.io;
struct s2n_blob client_cert_chain = {0};
GUARD(s2n_stuffer_read_uint24(in, &client_cert_chain.size));
S2N_ERROR_IF(client_cert_chain.size > s2n_stuffer_data_available(in), S2N_ERR_BAD_MESSAGE);
if (client_cert_chain.size == 0) {
GUARD(s2n_conn_set_handshake_no_client_cert(conn));
return 0;
}
client_cert_chain.data = s2n_stuffer_raw_read(in, client_cert_chain.size);
notnull_check(client_cert_chain.data);
s2n_cert_public_key public_key;
GUARD(s2n_pkey_zero_init(&public_key));
s2n_pkey_type pkey_type;
/* Determine the Cert Type, Verify the Cert, and extract the Public Key */
S2N_ERROR_IF(s2n_x509_validator_validate_cert_chain(&conn->x509_validator, conn,
client_cert_chain.data, client_cert_chain.size,
&pkey_type, &public_key) != S2N_CERT_OK, S2N_ERR_CERT_UNTRUSTED);
conn->secure.client_cert_pkey_type = pkey_type;
GUARD(s2n_pkey_setup_for_type(&public_key, pkey_type));
GUARD(s2n_pkey_check_key_exists(&public_key));
GUARD(s2n_dup(&client_cert_chain, &conn->secure.client_cert_chain));
conn->secure.client_public_key = public_key;
return 0;
}
int s2n_client_cert_send(struct s2n_connection *conn)
{
struct s2n_cert_chain_and_key *chain_and_key = conn->handshake_params.our_chain_and_key;
if (conn->actual_protocol_version == S2N_TLS13) {
/* If this message is in response to a CertificateRequest, the value of
* certificate_request_context in that message.
* https://tools.ietf.org/html/rfc8446#section-4.4.2
*
* This field SHALL be zero length unless used for the post-handshake authentication
* https://tools.ietf.org/html/rfc8446#section-4.3.2
*/
uint8_t certificate_request_context_len = 0;
GUARD(s2n_stuffer_write_uint8(&conn->handshake.io, certificate_request_context_len));
}
if (chain_and_key == NULL) {
GUARD(s2n_conn_set_handshake_no_client_cert(conn));
GUARD(s2n_send_empty_cert_chain(&conn->handshake.io));
return 0;
}
GUARD(s2n_send_cert_chain(conn, &conn->handshake.io, chain_and_key));
return 0;
}
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