Line data Source code
1 : /**
2 : * Copyright Notice:
3 : * Copyright 2021-2025 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_requester_lib.h"
8 :
9 : #if (LIBSPDM_ENABLE_CAPABILITY_MUT_AUTH_CAP) && (LIBSPDM_ENABLE_CAPABILITY_ENCAP_CAP) && \
10 : (LIBSPDM_ENABLE_CAPABILITY_CHAL_CAP)
11 :
12 7 : libspdm_return_t libspdm_get_encap_response_challenge_auth(
13 : void *spdm_context, size_t request_size, void *request,
14 : size_t *response_size, void *response)
15 : {
16 : spdm_challenge_request_t *spdm_request;
17 : spdm_challenge_auth_response_t *spdm_response;
18 : bool result;
19 : size_t signature_size;
20 : uint8_t slot_id;
21 : uint32_t hash_size;
22 : uint32_t measurement_summary_hash_size;
23 : uint8_t *ptr;
24 : libspdm_context_t *context;
25 : uint8_t auth_attribute;
26 : libspdm_return_t status;
27 : uint8_t slot_mask;
28 : size_t request_context_size;
29 : const void *request_context;
30 : uint8_t *opaque_data;
31 : size_t opaque_data_size;
32 : size_t spdm_request_size;
33 : size_t spdm_response_size;
34 :
35 7 : context = spdm_context;
36 7 : spdm_request = request;
37 :
38 7 : if (libspdm_get_connection_version(context) < SPDM_MESSAGE_VERSION_11) {
39 0 : return libspdm_generate_encap_error_response(
40 : context, SPDM_ERROR_CODE_UNSUPPORTED_REQUEST,
41 : SPDM_CHALLENGE, response_size, response);
42 : }
43 :
44 7 : if (spdm_request->header.spdm_version != libspdm_get_connection_version(context)) {
45 0 : return libspdm_generate_encap_error_response(
46 : context, SPDM_ERROR_CODE_VERSION_MISMATCH,
47 : 0, response_size, response);
48 : }
49 :
50 7 : if (!libspdm_is_capabilities_flag_supported(
51 : context, true,
52 : SPDM_GET_CAPABILITIES_REQUEST_FLAGS_CHAL_CAP, 0)) {
53 1 : return libspdm_generate_encap_error_response(
54 : context, SPDM_ERROR_CODE_UNSUPPORTED_REQUEST,
55 : SPDM_CHALLENGE, response_size, response);
56 : }
57 :
58 6 : if (request_size < sizeof(spdm_challenge_request_t)) {
59 0 : return libspdm_generate_encap_error_response(
60 : context, SPDM_ERROR_CODE_INVALID_REQUEST, 0,
61 : response_size, response);
62 : }
63 6 : spdm_request_size = sizeof(spdm_challenge_request_t);
64 6 : if (spdm_request->header.spdm_version >= SPDM_MESSAGE_VERSION_13) {
65 2 : if (request_size < sizeof(spdm_challenge_request_t) + SPDM_REQ_CONTEXT_SIZE) {
66 0 : return libspdm_generate_encap_error_response(
67 : context, SPDM_ERROR_CODE_INVALID_REQUEST, 0,
68 : response_size, response);
69 : }
70 2 : spdm_request_size += SPDM_REQ_CONTEXT_SIZE;
71 : }
72 :
73 6 : if (spdm_request->header.param2 != SPDM_CHALLENGE_REQUEST_NO_MEASUREMENT_SUMMARY_HASH) {
74 0 : return libspdm_generate_encap_error_response(
75 : context, SPDM_ERROR_CODE_INVALID_REQUEST, 0,
76 : response_size, response);
77 : }
78 :
79 6 : slot_id = spdm_request->header.param1;
80 :
81 6 : if ((slot_id != 0xFF) && (slot_id >= SPDM_MAX_SLOT_COUNT)) {
82 2 : return libspdm_generate_encap_error_response(
83 : context, SPDM_ERROR_CODE_INVALID_REQUEST, 0,
84 : response_size, response);
85 : }
86 :
87 4 : if ((spdm_request->header.spdm_version >= SPDM_MESSAGE_VERSION_13) &&
88 2 : context->connection_info.multi_key_conn_req && (slot_id != 0xFF)) {
89 1 : if ((context->local_context.local_key_usage_bit_mask[slot_id] &
90 : SPDM_KEY_USAGE_BIT_MASK_CHALLENGE_USE) == 0) {
91 1 : return libspdm_generate_encap_error_response(
92 : context, SPDM_ERROR_CODE_INVALID_REQUEST, 0,
93 : response_size, response);
94 : }
95 : }
96 :
97 3 : libspdm_reset_message_buffer_via_request_code(context, NULL,
98 3 : spdm_request->header.request_response_code);
99 :
100 3 : if (context->connection_info.algorithm.req_pqc_asym_alg != 0) {
101 0 : signature_size = libspdm_get_req_pqc_asym_signature_size(
102 : context->connection_info.algorithm.req_pqc_asym_alg);
103 : } else {
104 3 : signature_size = libspdm_get_req_asym_signature_size(
105 3 : context->connection_info.algorithm.req_base_asym_alg);
106 : }
107 3 : hash_size = libspdm_get_hash_size(context->connection_info.algorithm.base_hash_algo);
108 :
109 : /* Requester does not support measurements,
110 : * hence the size of MeasurementSummaryHash is always 0. */
111 3 : measurement_summary_hash_size = 0;
112 :
113 : /* response_size should be large enough to hold a challenge response without opaque data. */
114 3 : LIBSPDM_ASSERT(*response_size >= sizeof(spdm_challenge_auth_response_t) + hash_size +
115 : SPDM_NONCE_SIZE + measurement_summary_hash_size + sizeof(uint16_t) +
116 : SPDM_REQ_CONTEXT_SIZE + signature_size);
117 :
118 3 : if (spdm_request->header.spdm_version >= SPDM_MESSAGE_VERSION_13) {
119 1 : request_context_size = SPDM_REQ_CONTEXT_SIZE;
120 1 : request_context = spdm_request + 1;
121 : } else {
122 2 : request_context_size = 0;
123 2 : request_context = NULL;
124 : }
125 :
126 3 : libspdm_zero_mem(response, *response_size);
127 3 : spdm_response = response;
128 :
129 3 : spdm_response->header.spdm_version = spdm_request->header.spdm_version;
130 3 : spdm_response->header.request_response_code = SPDM_CHALLENGE_AUTH;
131 3 : auth_attribute = (uint8_t)(slot_id & 0xF);
132 3 : spdm_response->header.param1 = auth_attribute;
133 :
134 3 : if (slot_id == 0xFF) {
135 1 : spdm_response->header.param2 = 0;
136 : } else {
137 2 : slot_mask = libspdm_get_cert_slot_mask(context);
138 2 : if (slot_mask != 0) {
139 2 : spdm_response->header.param2 = slot_mask;
140 : } else {
141 0 : return libspdm_generate_encap_error_response(
142 : context, SPDM_ERROR_CODE_UNSPECIFIED,
143 : 0, response_size, response);
144 : }
145 : }
146 :
147 3 : ptr = (void *)(spdm_response + 1);
148 3 : if (slot_id == 0xFF) {
149 1 : result = libspdm_generate_public_key_hash(context, ptr);
150 : } else {
151 2 : result = libspdm_generate_cert_chain_hash(context, slot_id, ptr);
152 : }
153 3 : if (!result) {
154 0 : return libspdm_generate_encap_error_response(
155 : context, SPDM_ERROR_CODE_UNSPECIFIED, 0,
156 : response_size, response);
157 : }
158 3 : ptr += hash_size;
159 :
160 3 : if (!libspdm_get_random_number(SPDM_NONCE_SIZE, ptr)) {
161 0 : return libspdm_generate_encap_error_response(
162 : context, SPDM_ERROR_CODE_UNSPECIFIED, 0,
163 : response_size, response);
164 : }
165 3 : ptr += SPDM_NONCE_SIZE;
166 :
167 3 : ptr += measurement_summary_hash_size;
168 :
169 3 : opaque_data_size = *response_size - (sizeof(spdm_challenge_auth_response_t) + hash_size +
170 3 : SPDM_NONCE_SIZE + measurement_summary_hash_size +
171 3 : sizeof(uint16_t) + signature_size);
172 3 : opaque_data = (uint8_t *)response + sizeof(spdm_challenge_auth_response_t) + hash_size +
173 3 : SPDM_NONCE_SIZE + measurement_summary_hash_size + sizeof(uint16_t);
174 :
175 3 : result = libspdm_encap_challenge_opaque_data(
176 : spdm_context,
177 3 : context->connection_info.version,
178 : slot_id,
179 : request_context_size,
180 : request_context,
181 : opaque_data, &opaque_data_size);
182 3 : if (!result) {
183 0 : return libspdm_generate_encap_error_response(
184 : context, SPDM_ERROR_CODE_UNSPECIFIED,
185 : 0, response_size, response);
186 : }
187 :
188 : /*write opaque_data_size*/
189 3 : libspdm_write_uint16 (ptr, (uint16_t)opaque_data_size);
190 3 : ptr += sizeof(uint16_t);
191 :
192 : /*the opaque_data is stored by libspdm_encap_challenge_opaque_data*/
193 3 : ptr += opaque_data_size;
194 :
195 3 : if (spdm_request->header.spdm_version >= SPDM_MESSAGE_VERSION_13) {
196 1 : libspdm_copy_mem(ptr, SPDM_REQ_CONTEXT_SIZE,
197 1 : spdm_request + 1, SPDM_REQ_CONTEXT_SIZE);
198 1 : ptr += SPDM_REQ_CONTEXT_SIZE;
199 : }
200 :
201 : /*get actual response size*/
202 3 : spdm_response_size =
203 : sizeof(spdm_challenge_auth_response_t) + hash_size +
204 3 : SPDM_NONCE_SIZE + measurement_summary_hash_size +
205 3 : sizeof(uint16_t) + opaque_data_size + signature_size;
206 3 : if (spdm_request->header.spdm_version >= SPDM_MESSAGE_VERSION_13) {
207 1 : spdm_response_size += SPDM_REQ_CONTEXT_SIZE;
208 : }
209 :
210 3 : LIBSPDM_ASSERT(*response_size >= spdm_response_size);
211 :
212 3 : *response_size = spdm_response_size;
213 :
214 3 : status = libspdm_append_message_mut_c(context, spdm_request, spdm_request_size);
215 3 : if (LIBSPDM_STATUS_IS_ERROR(status)) {
216 0 : return libspdm_generate_encap_error_response(
217 : context, SPDM_ERROR_CODE_UNSPECIFIED, 0,
218 : response_size, response);
219 : }
220 :
221 3 : status = libspdm_append_message_mut_c(context, spdm_response,
222 3 : (size_t)ptr - (size_t)spdm_response);
223 3 : if (LIBSPDM_STATUS_IS_ERROR(status)) {
224 0 : libspdm_reset_message_mut_c(context);
225 0 : return libspdm_generate_encap_error_response(
226 : context, SPDM_ERROR_CODE_UNSPECIFIED, 0,
227 : response_size, response);
228 : }
229 3 : result = libspdm_generate_challenge_auth_signature(context, true, slot_id, ptr);
230 3 : if (!result) {
231 0 : return libspdm_generate_encap_error_response(
232 : context, SPDM_ERROR_CODE_UNSPECIFIED,
233 : 0, response_size, response);
234 : }
235 :
236 3 : return LIBSPDM_STATUS_SUCCESS;
237 : }
238 :
239 : #endif /* (LIBSPDM_ENABLE_CAPABILITY_MUT_AUTH_CAP) && (..) */
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