Line data    Source code

       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            8 : 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            8 :     spdm_request = request;
      21              : 
      22            8 :     if (libspdm_get_connection_version(spdm_context) < SPDM_MESSAGE_VERSION_11) {
      23            0 :         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              : }