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       1                 :             : /**
       2                 :             :  *  Copyright Notice:
       3                 :             :  *  Copyright 2021-2024 DMTF. All rights reserved.
       4                 :             :  *  License: BSD 3-Clause License. For full text see link: https://github.com/DMTF/libspdm/blob/main/LICENSE.md
       5                 :             :  **/
       6                 :             : 
       7                 :             : #include "internal/libspdm_responder_lib.h"
       8                 :             : 
       9                 :           9 : libspdm_return_t libspdm_get_response_end_session(libspdm_context_t *spdm_context,
      10                 :             :                                                   size_t request_size,
      11                 :             :                                                   const void *request,
      12                 :             :                                                   size_t *response_size,
      13                 :             :                                                   void *response)
      14                 :             : {
      15                 :             :     spdm_end_session_response_t *spdm_response;
      16                 :             :     const spdm_end_session_request_t *spdm_request;
      17                 :             :     libspdm_session_info_t *session_info;
      18                 :             :     libspdm_session_state_t session_state;
      19                 :             : 
      20                 :           9 :     spdm_request = request;
      21                 :             : 
      22         [ +  + ]:           9 :     if (libspdm_get_connection_version(spdm_context) < SPDM_MESSAGE_VERSION_11) {
      23                 :           1 :         return libspdm_generate_error_response(spdm_context,
      24                 :             :                                                SPDM_ERROR_CODE_UNSUPPORTED_REQUEST,
      25                 :             :                                                SPDM_END_SESSION,
      26                 :             :                                                response_size, response);
      27                 :             :     }
      28                 :             : 
      29         [ -  + ]:           8 :     if (spdm_request->header.spdm_version != libspdm_get_connection_version(spdm_context)) {
      30                 :           0 :         return libspdm_generate_error_response(spdm_context,
      31                 :             :                                                SPDM_ERROR_CODE_VERSION_MISMATCH, 0,
      32                 :             :                                                response_size, response);
      33                 :             :     }
      34         [ +  + ]:           8 :     if (spdm_context->response_state != LIBSPDM_RESPONSE_STATE_NORMAL) {
      35                 :           3 :         return libspdm_responder_handle_response_state(
      36                 :             :             spdm_context,
      37                 :           3 :             spdm_request->header.request_response_code,
      38                 :             :             response_size, response);
      39                 :             :     }
      40         [ +  + ]:           5 :     if (spdm_context->connection_info.connection_state < LIBSPDM_CONNECTION_STATE_NEGOTIATED) {
      41                 :           1 :         return libspdm_generate_error_response(spdm_context,
      42                 :             :                                                SPDM_ERROR_CODE_UNEXPECTED_REQUEST,
      43                 :             :                                                0, response_size, response);
      44                 :             :     }
      45                 :             : 
      46         [ -  + ]:           4 :     if (!spdm_context->last_spdm_request_session_id_valid) {
      47         [ #  # ]:           0 :         if (libspdm_get_connection_version(spdm_context) >= SPDM_MESSAGE_VERSION_12) {
      48                 :           0 :             return libspdm_generate_error_response(spdm_context,
      49                 :             :                                                    SPDM_ERROR_CODE_SESSION_REQUIRED, 0,
      50                 :             :                                                    response_size, response);
      51                 :             :         } else {
      52                 :           0 :             return libspdm_generate_error_response(spdm_context,
      53                 :             :                                                    SPDM_ERROR_CODE_UNSPECIFIED, 0,
      54                 :             :                                                    response_size, response);
      55                 :             :         }
      56                 :             :     }
      57                 :           4 :     session_info = libspdm_get_session_info_via_session_id(
      58                 :             :         spdm_context, spdm_context->last_spdm_request_session_id);
      59         [ -  + ]:           4 :     if (session_info == NULL) {
      60         [ #  # ]:           0 :         if (libspdm_get_connection_version(spdm_context) >= SPDM_MESSAGE_VERSION_12) {
      61                 :           0 :             return libspdm_generate_error_response(spdm_context,
      62                 :             :                                                    SPDM_ERROR_CODE_SESSION_REQUIRED, 0,
      63                 :             :                                                    response_size, response);
      64                 :             :         } else {
      65                 :           0 :             return libspdm_generate_error_response(spdm_context,
      66                 :             :                                                    SPDM_ERROR_CODE_UNSPECIFIED, 0,
      67                 :             :                                                    response_size, response);
      68                 :             :         }
      69                 :             :     }
      70                 :           4 :     session_state = libspdm_secured_message_get_session_state(
      71                 :             :         session_info->secured_message_context);
      72         [ -  + ]:           4 :     if (session_state != LIBSPDM_SESSION_STATE_ESTABLISHED) {
      73                 :           0 :         return libspdm_generate_error_response(spdm_context,
      74                 :             :                                                SPDM_ERROR_CODE_UNEXPECTED_REQUEST, 0,
      75                 :             :                                                response_size, response);
      76                 :             :     }
      77                 :             : 
      78                 :             :     /* this message can only be in secured session
      79                 :             :      * thus don't need to consider transport layer padding, just check its exact size */
      80         [ +  + ]:           4 :     if (request_size != sizeof(spdm_end_session_request_t)) {
      81                 :           1 :         return libspdm_generate_error_response(spdm_context,
      82                 :             :                                                SPDM_ERROR_CODE_INVALID_REQUEST, 0,
      83                 :             :                                                response_size, response);
      84                 :             :     }
      85                 :             : 
      86                 :           3 :     libspdm_reset_message_buffer_via_request_code(spdm_context, session_info,
      87                 :           3 :                                                   spdm_request->header.request_response_code);
      88                 :             : 
      89                 :           3 :     session_info->end_session_attributes = spdm_request->header.param1;
      90         [ +  + ]:           3 :     if ((spdm_request->header.param1 &
      91                 :             :          SPDM_END_SESSION_REQUEST_ATTRIBUTES_PRESERVE_NEGOTIATED_STATE_CLEAR) != 0) {
      92                 :           1 :         spdm_context->connection_info.end_session_attributes |=
      93                 :             :             SPDM_END_SESSION_REQUEST_ATTRIBUTES_PRESERVE_NEGOTIATED_STATE_CLEAR;
      94                 :             :     }
      95                 :             : 
      96         [ -  + ]:           3 :     LIBSPDM_ASSERT(*response_size >= sizeof(spdm_end_session_response_t));
      97                 :           3 :     *response_size = sizeof(spdm_end_session_response_t);
      98                 :           3 :     libspdm_zero_mem(response, *response_size);
      99                 :           3 :     spdm_response = response;
     100                 :             : 
     101                 :           3 :     spdm_response->header.spdm_version = spdm_request->header.spdm_version;
     102                 :           3 :     spdm_response->header.request_response_code = SPDM_END_SESSION_ACK;
     103                 :           3 :     spdm_response->header.param1 = 0;
     104                 :           3 :     spdm_response->header.param2 = 0;
     105                 :             : 
     106                 :           3 :     return LIBSPDM_STATUS_SUCCESS;
     107                 :             : }