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1 /* SPDX-License-Identifier: BSD-2-Clause */
2 /*******************************************************************************
3  * Copyright 2017-2018, Fraunhofer SIT sponsored by Infineon Technologies AG
4  * All rights reserved.
5  ******************************************************************************/
6 
7 #ifdef HAVE_CONFIG_H
8 #include <config.h>
9 #endif
10 
11 #include "tss2_mu.h"
12 #include "tss2_sys.h"
13 #include "tss2_esys.h"
14 
15 #include "esys_types.h"
16 #include "esys_iutil.h"
17 #include "esys_mu.h"
18 #define LOGMODULE esys
19 #include "util/log.h"
20 #include "util/aux_util.h"
21 
22 /** Store command parameters inside the ESYS_CONTEXT for use during _Finish */
store_input_parameters(ESYS_CONTEXT * esysContext,ESYS_TR nvIndex)23 static void store_input_parameters (
24     ESYS_CONTEXT *esysContext,
25     ESYS_TR nvIndex)
26 {
27     esysContext->in.NV.nvIndex = nvIndex;
28 }
29 
30 /** One-Call function for TPM2_NV_UndefineSpace
31  *
32  * This function invokes the TPM2_NV_UndefineSpace command in a one-call
33  * variant. This means the function will block until the TPM response is
34  * available. All input parameters are const. The memory for non-simple output
35  * parameters is allocated by the function implementation.
36  *
37  * @param[in,out] esysContext The ESYS_CONTEXT.
38  * @param[in]  authHandle TPM2_RH_OWNER or TPM2_RH_PLATFORM+{PP}.
39  * @param[in]  nvIndex The NV Index to remove from NV space.
40  * @param[in]  shandle1 Session handle for authorization of authHandle
41  * @param[in]  shandle2 Second session handle.
42  * @param[in]  shandle3 Third session handle.
43  * @retval TSS2_RC_SUCCESS if the function call was a success.
44  * @retval TSS2_ESYS_RC_BAD_REFERENCE if the esysContext or required input
45  *         pointers or required output handle references are NULL.
46  * @retval TSS2_ESYS_RC_BAD_CONTEXT: if esysContext corruption is detected.
47  * @retval TSS2_ESYS_RC_MEMORY: if the ESAPI cannot allocate enough memory for
48  *         internal operations or return parameters.
49  * @retval TSS2_ESYS_RC_BAD_SEQUENCE: if the context has an asynchronous
50  *         operation already pending.
51  * @retval TSS2_ESYS_RC_INSUFFICIENT_RESPONSE: if the TPM's response does not
52  *          at least contain the tag, response length, and response code.
53  * @retval TSS2_ESYS_RC_MALFORMED_RESPONSE: if the TPM's response is corrupted.
54  * @retval TSS2_ESYS_RC_RSP_AUTH_FAILED: if the response HMAC from the TPM
55            did not verify.
56  * @retval TSS2_ESYS_RC_MULTIPLE_DECRYPT_SESSIONS: if more than one session has
57  *         the 'decrypt' attribute bit set.
58  * @retval TSS2_ESYS_RC_MULTIPLE_ENCRYPT_SESSIONS: if more than one session has
59  *         the 'encrypt' attribute bit set.
60  * @retval TSS2_ESYS_RC_BAD_TR: if any of the ESYS_TR objects are unknown
61  *         to the ESYS_CONTEXT or are of the wrong type or if required
62  *         ESYS_TR objects are ESYS_TR_NONE.
63  * @retval TSS2_ESYS_RC_NO_DECRYPT_PARAM: if one of the sessions has the
64  *         'decrypt' attribute set and the command does not support encryption
65  *         of the first command parameter.
66  * @retval TSS2_ESYS_RC_NO_ENCRYPT_PARAM: if one of the sessions has the
67  *         'encrypt' attribute set and the command does not support encryption
68  *          of the first response parameter.
69  * @retval TSS2_RCs produced by lower layers of the software stack may be
70  *         returned to the caller unaltered unless handled internally.
71  */
72 TSS2_RC
Esys_NV_UndefineSpace(ESYS_CONTEXT * esysContext,ESYS_TR authHandle,ESYS_TR nvIndex,ESYS_TR shandle1,ESYS_TR shandle2,ESYS_TR shandle3)73 Esys_NV_UndefineSpace(
74     ESYS_CONTEXT *esysContext,
75     ESYS_TR authHandle,
76     ESYS_TR nvIndex,
77     ESYS_TR shandle1,
78     ESYS_TR shandle2,
79     ESYS_TR shandle3)
80 {
81     TSS2_RC r;
82 
83     r = Esys_NV_UndefineSpace_Async(esysContext, authHandle, nvIndex, shandle1,
84                                     shandle2, shandle3);
85     return_if_error(r, "Error in async function");
86 
87     /* Set the timeout to indefinite for now, since we want _Finish to block */
88     int32_t timeouttmp = esysContext->timeout;
89     esysContext->timeout = -1;
90     /*
91      * Now we call the finish function, until return code is not equal to
92      * from TSS2_BASE_RC_TRY_AGAIN.
93      * Note that the finish function may return TSS2_RC_TRY_AGAIN, even if we
94      * have set the timeout to -1. This occurs for example if the TPM requests
95      * a retransmission of the command via TPM2_RC_YIELDED.
96      */
97     do {
98         r = Esys_NV_UndefineSpace_Finish(esysContext);
99         /* This is just debug information about the reattempt to finish the
100            command */
101         if ((r & ~TSS2_RC_LAYER_MASK) == TSS2_BASE_RC_TRY_AGAIN)
102             LOG_DEBUG("A layer below returned TRY_AGAIN: %" PRIx32
103                       " => resubmitting command", r);
104     } while ((r & ~TSS2_RC_LAYER_MASK) == TSS2_BASE_RC_TRY_AGAIN);
105 
106     /* Restore the timeout value to the original value */
107     esysContext->timeout = timeouttmp;
108     return_if_error(r, "Esys Finish");
109 
110     return TSS2_RC_SUCCESS;
111 }
112 
113 /** Asynchronous function for TPM2_NV_UndefineSpace
114  *
115  * This function invokes the TPM2_NV_UndefineSpace command in a asynchronous
116  * variant. This means the function will return as soon as the command has been
117  * sent downwards the stack to the TPM. All input parameters are const.
118  * In order to retrieve the TPM's response call Esys_NV_UndefineSpace_Finish.
119  *
120  * @param[in,out] esysContext The ESYS_CONTEXT.
121  * @param[in]  authHandle TPM2_RH_OWNER or TPM2_RH_PLATFORM+{PP}.
122  * @param[in]  nvIndex The NV Index to remove from NV space.
123  * @param[in]  shandle1 Session handle for authorization of authHandle
124  * @param[in]  shandle2 Second session handle.
125  * @param[in]  shandle3 Third session handle.
126  * @retval ESYS_RC_SUCCESS if the function call was a success.
127  * @retval TSS2_ESYS_RC_BAD_REFERENCE if the esysContext or required input
128  *         pointers or required output handle references are NULL.
129  * @retval TSS2_ESYS_RC_BAD_CONTEXT: if esysContext corruption is detected.
130  * @retval TSS2_ESYS_RC_MEMORY: if the ESAPI cannot allocate enough memory for
131  *         internal operations or return parameters.
132  * @retval TSS2_RCs produced by lower layers of the software stack may be
133            returned to the caller unaltered unless handled internally.
134  * @retval TSS2_ESYS_RC_MULTIPLE_DECRYPT_SESSIONS: if more than one session has
135  *         the 'decrypt' attribute bit set.
136  * @retval TSS2_ESYS_RC_MULTIPLE_ENCRYPT_SESSIONS: if more than one session has
137  *         the 'encrypt' attribute bit set.
138  * @retval TSS2_ESYS_RC_BAD_TR: if any of the ESYS_TR objects are unknown
139  *         to the ESYS_CONTEXT or are of the wrong type or if required
140  *         ESYS_TR objects are ESYS_TR_NONE.
141  * @retval TSS2_ESYS_RC_NO_DECRYPT_PARAM: if one of the sessions has the
142  *         'decrypt' attribute set and the command does not support encryption
143  *         of the first command parameter.
144  * @retval TSS2_ESYS_RC_NO_ENCRYPT_PARAM: if one of the sessions has the
145  *         'encrypt' attribute set and the command does not support encryption
146  *          of the first response parameter.
147  */
148 TSS2_RC
Esys_NV_UndefineSpace_Async(ESYS_CONTEXT * esysContext,ESYS_TR authHandle,ESYS_TR nvIndex,ESYS_TR shandle1,ESYS_TR shandle2,ESYS_TR shandle3)149 Esys_NV_UndefineSpace_Async(
150     ESYS_CONTEXT *esysContext,
151     ESYS_TR authHandle,
152     ESYS_TR nvIndex,
153     ESYS_TR shandle1,
154     ESYS_TR shandle2,
155     ESYS_TR shandle3)
156 {
157     TSS2_RC r;
158     LOG_TRACE("context=%p, authHandle=%"PRIx32 ", nvIndex=%"PRIx32 "",
159               esysContext, authHandle, nvIndex);
160     TSS2L_SYS_AUTH_COMMAND auths;
161     RSRC_NODE_T *authHandleNode;
162     RSRC_NODE_T *nvIndexNode;
163 
164     /* Check context, sequence correctness and set state to error for now */
165     if (esysContext == NULL) {
166         LOG_ERROR("esyscontext is NULL.");
167         return TSS2_ESYS_RC_BAD_REFERENCE;
168     }
169     r = iesys_check_sequence_async(esysContext);
170     if (r != TSS2_RC_SUCCESS)
171         return r;
172     esysContext->state = _ESYS_STATE_INTERNALERROR;
173 
174     /* Check input parameters */
175     r = check_session_feasibility(shandle1, shandle2, shandle3, 1);
176     return_state_if_error(r, _ESYS_STATE_INIT, "Check session usage");
177     store_input_parameters(esysContext, nvIndex);
178 
179     /* Retrieve the metadata objects for provided handles */
180     r = esys_GetResourceObject(esysContext, authHandle, &authHandleNode);
181     return_state_if_error(r, _ESYS_STATE_INIT, "authHandle unknown.");
182     r = esys_GetResourceObject(esysContext, nvIndex, &nvIndexNode);
183     return_state_if_error(r, _ESYS_STATE_INIT, "nvIndex unknown.");
184 
185     /* Initial invocation of SAPI to prepare the command buffer with parameters */
186     r = Tss2_Sys_NV_UndefineSpace_Prepare(esysContext->sys,
187                                           (authHandleNode == NULL) ? TPM2_RH_NULL
188                                            : authHandleNode->rsrc.handle,
189                                           (nvIndexNode == NULL) ? TPM2_RH_NULL
190                                            : nvIndexNode->rsrc.handle);
191     return_state_if_error(r, _ESYS_STATE_INIT, "SAPI Prepare returned error.");
192 
193     /* Calculate the cpHash Values */
194     r = init_session_tab(esysContext, shandle1, shandle2, shandle3);
195     return_state_if_error(r, _ESYS_STATE_INIT, "Initialize session resources");
196     if (authHandleNode != NULL)
197         iesys_compute_session_value(esysContext->session_tab[0],
198                 &authHandleNode->rsrc.name, &authHandleNode->auth);
199     else
200         iesys_compute_session_value(esysContext->session_tab[0], NULL, NULL);
201 
202     iesys_compute_session_value(esysContext->session_tab[1], NULL, NULL);
203     iesys_compute_session_value(esysContext->session_tab[2], NULL, NULL);
204 
205     /* Generate the auth values and set them in the SAPI command buffer */
206     r = iesys_gen_auths(esysContext, authHandleNode, nvIndexNode, NULL, &auths);
207     return_state_if_error(r, _ESYS_STATE_INIT,
208                           "Error in computation of auth values");
209 
210     esysContext->authsCount = auths.count;
211     if (auths.count > 0) {
212         r = Tss2_Sys_SetCmdAuths(esysContext->sys, &auths);
213         return_state_if_error(r, _ESYS_STATE_INIT, "SAPI error on SetCmdAuths");
214     }
215 
216     /* Trigger execution and finish the async invocation */
217     r = Tss2_Sys_ExecuteAsync(esysContext->sys);
218     return_state_if_error(r, _ESYS_STATE_INTERNALERROR,
219                           "Finish (Execute Async)");
220 
221     esysContext->state = _ESYS_STATE_SENT;
222 
223     return r;
224 }
225 
226 /** Asynchronous finish function for TPM2_NV_UndefineSpace
227  *
228  * This function returns the results of a TPM2_NV_UndefineSpace command
229  * invoked via Esys_NV_UndefineSpace_Finish. All non-simple output parameters
230  * are allocated by the function's implementation. NULL can be passed for every
231  * output parameter if the value is not required.
232  *
233  * @param[in,out] esysContext The ESYS_CONTEXT.
234  * @retval TSS2_RC_SUCCESS on success
235  * @retval ESYS_RC_SUCCESS if the function call was a success.
236  * @retval TSS2_ESYS_RC_BAD_REFERENCE if the esysContext or required input
237  *         pointers or required output handle references are NULL.
238  * @retval TSS2_ESYS_RC_BAD_CONTEXT: if esysContext corruption is detected.
239  * @retval TSS2_ESYS_RC_MEMORY: if the ESAPI cannot allocate enough memory for
240  *         internal operations or return parameters.
241  * @retval TSS2_ESYS_RC_BAD_SEQUENCE: if the context has an asynchronous
242  *         operation already pending.
243  * @retval TSS2_ESYS_RC_TRY_AGAIN: if the timeout counter expires before the
244  *         TPM response is received.
245  * @retval TSS2_ESYS_RC_INSUFFICIENT_RESPONSE: if the TPM's response does not
246  *         at least contain the tag, response length, and response code.
247  * @retval TSS2_ESYS_RC_RSP_AUTH_FAILED: if the response HMAC from the TPM did
248  *         not verify.
249  * @retval TSS2_ESYS_RC_MALFORMED_RESPONSE: if the TPM's response is corrupted.
250  * @retval TSS2_RCs produced by lower layers of the software stack may be
251  *         returned to the caller unaltered unless handled internally.
252  */
253 TSS2_RC
Esys_NV_UndefineSpace_Finish(ESYS_CONTEXT * esysContext)254 Esys_NV_UndefineSpace_Finish(
255     ESYS_CONTEXT *esysContext)
256 {
257     TSS2_RC r;
258     LOG_TRACE("context=%p",
259               esysContext);
260 
261     if (esysContext == NULL) {
262         LOG_ERROR("esyscontext is NULL.");
263         return TSS2_ESYS_RC_BAD_REFERENCE;
264     }
265 
266     /* Check for correct sequence and set sequence to irregular for now */
267     if (esysContext->state != _ESYS_STATE_SENT &&
268         esysContext->state != _ESYS_STATE_RESUBMISSION) {
269         LOG_ERROR("Esys called in bad sequence.");
270         return TSS2_ESYS_RC_BAD_SEQUENCE;
271     }
272     esysContext->state = _ESYS_STATE_INTERNALERROR;
273 
274     /*Receive the TPM response and handle resubmissions if necessary. */
275     r = Tss2_Sys_ExecuteFinish(esysContext->sys, esysContext->timeout);
276     if ((r & ~TSS2_RC_LAYER_MASK) == TSS2_BASE_RC_TRY_AGAIN) {
277         LOG_DEBUG("A layer below returned TRY_AGAIN: %" PRIx32, r);
278         esysContext->state = _ESYS_STATE_SENT;
279         return r;
280     }
281     /* This block handle the resubmission of TPM commands given a certain set of
282      * TPM response codes. */
283     if (r == TPM2_RC_RETRY || r == TPM2_RC_TESTING || r == TPM2_RC_YIELDED) {
284         LOG_DEBUG("TPM returned RETRY, TESTING or YIELDED, which triggers a "
285             "resubmission: %" PRIx32, r);
286         if (esysContext->submissionCount++ >= _ESYS_MAX_SUBMISSIONS) {
287             LOG_WARNING("Maximum number of (re)submissions has been reached.");
288             esysContext->state = _ESYS_STATE_INIT;
289             return r;
290         }
291         esysContext->state = _ESYS_STATE_RESUBMISSION;
292         r = Tss2_Sys_ExecuteAsync(esysContext->sys);
293         if (r != TSS2_RC_SUCCESS) {
294             LOG_WARNING("Error attempting to resubmit");
295             /* We do not set esysContext->state here but inherit the most recent
296              * state of the _async function. */
297             return r;
298         }
299         r = TSS2_ESYS_RC_TRY_AGAIN;
300         LOG_DEBUG("Resubmission initiated and returning RC_TRY_AGAIN.");
301         return r;
302     }
303     /* The following is the "regular error" handling. */
304     if (iesys_tpm_error(r)) {
305         LOG_WARNING("Received TPM Error");
306         esysContext->state = _ESYS_STATE_INIT;
307         return r;
308     } else if (r != TSS2_RC_SUCCESS) {
309         LOG_ERROR("Received a non-TPM Error");
310         esysContext->state = _ESYS_STATE_INTERNALERROR;
311         return r;
312     }
313 
314     /*
315      * Now the verification of the response (hmac check) and if necessary the
316      * parameter decryption have to be done.
317      */
318     r = iesys_check_response(esysContext);
319     return_state_if_error(r, _ESYS_STATE_INTERNALERROR,
320                           "Error: check response");
321 
322     /*
323      * After the verification of the response we call the complete function
324      * to deliver the result.
325      */
326     r = Tss2_Sys_NV_UndefineSpace_Complete(esysContext->sys);
327     return_state_if_error(r, _ESYS_STATE_INTERNALERROR,
328                           "Received error from SAPI unmarshaling" );
329 
330     /* The ESYS_TR object (nvIndex) has to be invalidated */
331     r = Esys_TR_Close(esysContext, &esysContext->in.NV.nvIndex);
332     return_if_error(r, "invalidate object");
333 
334     esysContext->state = _ESYS_STATE_INIT;
335 
336     return TSS2_RC_SUCCESS;
337 }
338