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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                 :            : #pragma once
      17                 :            : 
      18                 :            : #include <stdint.h>
      19                 :            : 
      20                 :            : #include "tls/s2n_connection.h"
      21                 :            : 
      22                 :       2352 : #define S2N_TLS_ALERT_LEVEL_WARNING 1
      23                 :          8 : #define S2N_TLS_ALERT_LEVEL_FATAL   2
      24                 :            : 
      25                 :            : typedef enum {
      26                 :            :     /*
      27                 :            :      *= https://www.rfc-editor.org/rfc/rfc8446#section-6
      28                 :            :      *# enum {
      29                 :            :      *#     close_notify(0),
      30                 :            :      *#     unexpected_message(10),
      31                 :            :      *#     bad_record_mac(20),
      32                 :            :      *#     record_overflow(22),
      33                 :            :      *#     handshake_failure(40),
      34                 :            :      */
      35                 :            :     S2N_TLS_ALERT_CLOSE_NOTIFY = 0,
      36                 :            :     S2N_TLS_ALERT_UNEXPECTED_MESSAGE = 10,
      37                 :            :     S2N_TLS_ALERT_BAD_RECORD_MAC = 20,
      38                 :            :     S2N_TLS_ALERT_RECORD_OVERFLOW = 22,
      39                 :            :     S2N_TLS_ALERT_HANDSHAKE_FAILURE = 40,
      40                 :            :     /*
      41                 :            :      *= https://www.rfc-editor.org/rfc/rfc8446#section-6
      42                 :            :      *#     bad_certificate(42),
      43                 :            :      *#     unsupported_certificate(43),
      44                 :            :      *#     certificate_revoked(44),
      45                 :            :      *#     certificate_expired(45),
      46                 :            :      *#     certificate_unknown(46),
      47                 :            :      */
      48                 :            :     S2N_TLS_ALERT_BAD_CERTIFICATE = 42,
      49                 :            :     S2N_TLS_ALERT_UNSUPPORTED_CERTIFICATE = 43,
      50                 :            :     S2N_TLS_ALERT_CERTIFICATE_REVOKED = 44,
      51                 :            :     S2N_TLS_ALERT_CERTIFICATE_EXPIRED = 45,
      52                 :            :     S2N_TLS_ALERT_CERTIFICATE_UNKNOWN = 46,
      53                 :            :     /*
      54                 :            :      *= https://www.rfc-editor.org/rfc/rfc8446#section-6
      55                 :            :      *#     illegal_parameter(47),
      56                 :            :      *#     unknown_ca(48),
      57                 :            :      *#     access_denied(49),
      58                 :            :      *#     decode_error(50),
      59                 :            :      *#     decrypt_error(51),
      60                 :            :      */
      61                 :            :     S2N_TLS_ALERT_ILLEGAL_PARAMETER = 47,
      62                 :            :     S2N_TLS_ALERT_UNKNOWN_CA = 48,
      63                 :            :     S2N_TLS_ALERT_ACCESS_DENIED = 49,
      64                 :            :     S2N_TLS_ALERT_DECODE_ERROR = 50,
      65                 :            :     S2N_TLS_ALERT_DECRYPT_ERROR = 51,
      66                 :            :     /*
      67                 :            :      *= https://www.rfc-editor.org/rfc/rfc8446#section-6
      68                 :            :      *#     protocol_version(70),
      69                 :            :      *#     insufficient_security(71),
      70                 :            :      *#     internal_error(80),
      71                 :            :      *#     inappropriate_fallback(86),
      72                 :            :      *#     user_canceled(90),
      73                 :            :      */
      74                 :            :     S2N_TLS_ALERT_PROTOCOL_VERSION = 70,
      75                 :            :     S2N_TLS_ALERT_INSUFFICIENT_SECURITY = 71,
      76                 :            :     S2N_TLS_ALERT_INTERNAL_ERROR = 80,
      77                 :            :     S2N_TLS_ALERT_INAPPROPRIATE_FALLBACK = 86,
      78                 :            :     S2N_TLS_ALERT_USER_CANCELED = 90,
      79                 :            :     /*
      80                 :            :      *= https://www.rfc-editor.org/rfc/rfc5246#section-7.2
      81                 :            :      *#     no_renegotiation(100),
      82                 :            :      */
      83                 :            :     S2N_TLS_ALERT_NO_RENEGOTIATION = 100,
      84                 :            :     /*
      85                 :            :      *= https://www.rfc-editor.org/rfc/rfc8446#section-6
      86                 :            :      *#     missing_extension(109),
      87                 :            :      *#     unsupported_extension(110),
      88                 :            :      *#     unrecognized_name(112),
      89                 :            :      *#     bad_certificate_status_response(113),
      90                 :            :      *#     unknown_psk_identity(115),
      91                 :            :      */
      92                 :            :     S2N_TLS_ALERT_MISSING_EXTENSION = 109,
      93                 :            :     S2N_TLS_ALERT_UNSUPPORTED_EXTENSION = 110,
      94                 :            :     S2N_TLS_ALERT_UNRECOGNIZED_NAME = 112,
      95                 :            :     S2N_TLS_ALERT_BAD_CERTIFICATE_STATUS_RESPONSE = 113,
      96                 :            :     S2N_TLS_ALERT_UNKNOWN_PSK_IDENTITY = 115,
      97                 :            :     /*
      98                 :            :      *= https://www.rfc-editor.org/rfc/rfc8446#section-6
      99                 :            :      *#     certificate_required(116),
     100                 :            :      *#     no_application_protocol(120),
     101                 :            :      *#     (255)
     102                 :            :      *# } AlertDescription;
     103                 :            :      */
     104                 :            :     S2N_TLS_ALERT_CERTIFICATE_REQUIRED = 116,
     105                 :            :     S2N_TLS_ALERT_NO_APPLICATION_PROTOCOL = 120,
     106                 :            : } s2n_tls_alert_code;
     107                 :            : 
     108                 :            : int s2n_process_alert_fragment(struct s2n_connection *conn);
     109                 :            : int s2n_queue_reader_unsupported_protocol_version_alert(struct s2n_connection *conn);
     110                 :            : int s2n_queue_reader_handshake_failure_alert(struct s2n_connection *conn);
     111                 :            : S2N_RESULT s2n_queue_reader_no_renegotiation_alert(struct s2n_connection *conn);
     112                 :            : S2N_RESULT s2n_alerts_write_error_or_close_notify(struct s2n_connection *conn);
     113                 :            : S2N_RESULT s2n_alerts_write_warning(struct s2n_connection *conn);