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       1                 :            : /*
       2                 :            :  * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
       3                 :            :  *
       4                 :            :  * Licensed under the Apache License, Version 2.0 (the "License").
       5                 :            :  * You may not use this file except in compliance with the License.
       6                 :            :  * A copy of the License is located at
       7                 :            :  *
       8                 :            :  *  http://aws.amazon.com/apache2.0
       9                 :            :  *
      10                 :            :  * or in the "license" file accompanying this file. This file is distributed
      11                 :            :  * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
      12                 :            :  * express or implied. See the License for the specific language governing
      13                 :            :  * permissions and limitations under the License.
      14                 :            :  */
      15                 :            : 
      16                 :            : #include "tls/extensions/s2n_client_signature_algorithms.h"
      17                 :            : 
      18                 :            : #include <stdint.h>
      19                 :            : #include <sys/param.h>
      20                 :            : 
      21                 :            : #include "tls/s2n_signature_algorithms.h"
      22                 :            : #include "tls/s2n_tls.h"
      23                 :            : #include "tls/s2n_tls_parameters.h"
      24                 :            : #include "utils/s2n_safety.h"
      25                 :            : 
      26                 :            : static bool s2n_client_signature_algorithms_should_send(struct s2n_connection *conn);
      27                 :            : static int s2n_client_signature_algorithms_send(struct s2n_connection *conn, struct s2n_stuffer *extension);
      28                 :            : static int s2n_client_signature_algorithms_recv(struct s2n_connection *conn, struct s2n_stuffer *extension);
      29                 :            : 
      30                 :            : const s2n_extension_type s2n_client_signature_algorithms_extension = {
      31                 :            :     .iana_value = TLS_EXTENSION_SIGNATURE_ALGORITHMS,
      32                 :            :     .is_response = false,
      33                 :            :     .send = s2n_client_signature_algorithms_send,
      34                 :            :     .recv = s2n_client_signature_algorithms_recv,
      35                 :            :     .should_send = s2n_client_signature_algorithms_should_send,
      36                 :            :     .if_missing = s2n_extension_noop_if_missing,
      37                 :            : };
      38                 :            : 
      39                 :            : static bool s2n_client_signature_algorithms_should_send(struct s2n_connection *conn)
      40                 :       7355 : {
      41                 :       7355 :     return s2n_connection_get_protocol_version(conn) >= S2N_TLS12;
      42                 :       7355 : }
      43                 :            : 
      44                 :            : static int s2n_client_signature_algorithms_send(struct s2n_connection *conn, struct s2n_stuffer *extension)
      45                 :       7226 : {
      46         [ -  + ]:       7226 :     POSIX_GUARD_RESULT(s2n_signature_algorithms_supported_list_send(conn, extension));
      47                 :       7226 :     return S2N_SUCCESS;
      48                 :       7226 : }
      49                 :            : 
      50                 :            : static int s2n_client_signature_algorithms_recv(struct s2n_connection *conn, struct s2n_stuffer *extension)
      51                 :       7233 : {
      52                 :       7233 :     return s2n_recv_supported_sig_scheme_list(extension, &conn->handshake_params.peer_sig_scheme_list);
      53                 :       7233 : }