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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_cert_status_request.h"
      17                 :            : 
      18                 :            : #include <stdint.h>
      19                 :            : 
      20                 :            : #include "tls/s2n_tls.h"
      21                 :            : #include "tls/s2n_tls_parameters.h"
      22                 :            : #include "utils/s2n_safety.h"
      23                 :            : 
      24                 :            : static bool s2n_client_cert_status_request_should_send(struct s2n_connection *conn);
      25                 :            : static int s2n_client_cert_status_request_send(struct s2n_connection *conn, struct s2n_stuffer *out);
      26                 :            : static int s2n_client_cert_status_request_recv(struct s2n_connection *conn, struct s2n_stuffer *extension);
      27                 :            : 
      28                 :            : const s2n_extension_type s2n_client_cert_status_request_extension = {
      29                 :            :     .iana_value = TLS_EXTENSION_STATUS_REQUEST,
      30                 :            :     .is_response = false,
      31                 :            :     .send = s2n_client_cert_status_request_send,
      32                 :            :     .recv = s2n_client_cert_status_request_recv,
      33                 :            :     .should_send = s2n_client_cert_status_request_should_send,
      34                 :            :     .if_missing = s2n_extension_noop_if_missing,
      35                 :            : };
      36                 :            : 
      37                 :            : static bool s2n_client_cert_status_request_should_send(struct s2n_connection *conn)
      38                 :       7723 : {
      39                 :       7723 :     return conn->request_ocsp_status;
      40                 :       7723 : }
      41                 :            : 
      42                 :            : static int s2n_client_cert_status_request_send(struct s2n_connection *conn, struct s2n_stuffer *out)
      43                 :        391 : {
      44         [ -  + ]:        391 :     POSIX_GUARD(s2n_stuffer_write_uint8(out, (uint8_t) S2N_STATUS_REQUEST_OCSP));
      45                 :            : 
      46                 :            :     /* responder_id_list
      47                 :            :      *
      48                 :            :      * From https://tools.ietf.org/html/rfc6066#section-8:
      49                 :            :      * A zero-length "responder_id_list" sequence has the special meaning that the responders are implicitly
      50                 :            :      * known to the server, e.g., by prior arrangement */
      51         [ -  + ]:        391 :     POSIX_GUARD(s2n_stuffer_write_uint16(out, 0));
      52                 :            : 
      53                 :            :     /* request_extensions
      54                 :            :      *
      55                 :            :      * From https://tools.ietf.org/html/rfc6066#section-8:
      56                 :            :      * A zero-length "request_extensions" value means that there are no extensions. */
      57         [ -  + ]:        391 :     POSIX_GUARD(s2n_stuffer_write_uint16(out, 0));
      58                 :            : 
      59                 :        391 :     return S2N_SUCCESS;
      60                 :        391 : }
      61                 :            : 
      62                 :            : static int s2n_client_cert_status_request_recv(struct s2n_connection *conn, struct s2n_stuffer *extension)
      63                 :        392 : {
      64         [ +  + ]:        392 :     if (s2n_stuffer_data_available(extension) < 5) {
      65                 :            :         /* Malformed length, ignore the extension */
      66                 :          1 :         return S2N_SUCCESS;
      67                 :          1 :     }
      68                 :            : 
      69                 :        391 :     uint8_t type = 0;
      70         [ -  + ]:        391 :     POSIX_GUARD(s2n_stuffer_read_uint8(extension, &type));
      71         [ +  + ]:        391 :     if (type != (uint8_t) S2N_STATUS_REQUEST_OCSP) {
      72                 :            :         /* We only support OCSP (type 1), ignore the extension */
      73                 :          1 :         return S2N_SUCCESS;
      74                 :          1 :     }
      75                 :            : 
      76                 :        390 :     conn->status_type = (s2n_status_request_type) type;
      77                 :        390 :     return S2N_SUCCESS;
      78                 :        391 : }