| /* SPDX-License-Identifier: BSD-2 */ |
| /******************************************************************************* |
| * Copyright 2017-2018, Fraunhofer SIT sponsored by Infineon Technologies AG |
| * All rights reserved. |
| ******************************************************************************/ |
| |
| #include "tss2_mu.h" |
| #include "tss2_sys.h" |
| #include "tss2_esys.h" |
| |
| #include "esys_types.h" |
| #include "esys_iutil.h" |
| #include "esys_mu.h" |
| #define LOGMODULE esys |
| #include "util/log.h" |
| |
| /** Store command parameters inside the ESYS_CONTEXT for use during _Finish */ |
| static void store_input_parameters ( |
| ESYS_CONTEXT *esysContext, |
| ESYS_TR authObject, |
| ESYS_TR policySession, |
| const TPM2B_NONCE *nonceTPM, |
| const TPM2B_DIGEST *cpHashA, |
| const TPM2B_NONCE *policyRef, |
| INT32 expiration, |
| const TPMT_SIGNATURE *auth) |
| { |
| esysContext->in.PolicySigned.authObject = authObject; |
| esysContext->in.PolicySigned.policySession = policySession; |
| esysContext->in.PolicySigned.expiration = expiration; |
| if (nonceTPM == NULL) { |
| esysContext->in.PolicySigned.nonceTPM = NULL; |
| } else { |
| esysContext->in.PolicySigned.nonceTPMData = *nonceTPM; |
| esysContext->in.PolicySigned.nonceTPM = |
| &esysContext->in.PolicySigned.nonceTPMData; |
| } |
| if (cpHashA == NULL) { |
| esysContext->in.PolicySigned.cpHashA = NULL; |
| } else { |
| esysContext->in.PolicySigned.cpHashAData = *cpHashA; |
| esysContext->in.PolicySigned.cpHashA = |
| &esysContext->in.PolicySigned.cpHashAData; |
| } |
| if (policyRef == NULL) { |
| esysContext->in.PolicySigned.policyRef = NULL; |
| } else { |
| esysContext->in.PolicySigned.policyRefData = *policyRef; |
| esysContext->in.PolicySigned.policyRef = |
| &esysContext->in.PolicySigned.policyRefData; |
| } |
| if (auth == NULL) { |
| esysContext->in.PolicySigned.auth = NULL; |
| } else { |
| esysContext->in.PolicySigned.authData = *auth; |
| esysContext->in.PolicySigned.auth = |
| &esysContext->in.PolicySigned.authData; |
| } |
| } |
| |
| /** One-Call function for TPM2_PolicySigned |
| * |
| * This function invokes the TPM2_PolicySigned command in a one-call |
| * variant. This means the function will block until the TPM response is |
| * available. All input parameters are const. The memory for non-simple output |
| * parameters is allocated by the function implementation. |
| * |
| * @param[in,out] esysContext The ESYS_CONTEXT. |
| * @param[in] authObject Handle for a key that will validate the signature. |
| * @param[in] policySession Handle for the policy session being extended. |
| * @param[in] shandle1 First session handle. |
| * @param[in] shandle2 Second session handle. |
| * @param[in] shandle3 Third session handle. |
| * @param[in] nonceTPM The policy nonce for the session. |
| * @param[in] cpHashA Digest of the command parameters to which this |
| * authorization is limited. |
| * @param[in] policyRef A reference to a policy relating to the authorization - |
| * may be the Empty Buffer. |
| * @param[in] expiration Time when authorization will expire, measured in seconds |
| * from the time that nonceTPM was generated. |
| * @param[in] auth Signed authorization (not optional). |
| * @param[out] timeout Implementation-specific time value, used to indicate to the |
| * TPM when the ticket expires. |
| * (callee-allocated) |
| * @param[out] policyTicket Produced if the command succeeds and expiration in the |
| * command was non-zero; this ticket will use the |
| * TPMT_ST_AUTH_SIGNED structure tag. See 23.2.5. |
| * (callee-allocated) |
| * @retval TSS2_RC_SUCCESS on success |
| * @retval ESYS_RC_SUCCESS if the function call was a success. |
| * @retval TSS2_ESYS_RC_BAD_REFERENCE if the esysContext or required input |
| * pointers or required output handle references are NULL. |
| * @retval TSS2_ESYS_RC_BAD_CONTEXT: if esysContext corruption is detected. |
| * @retval TSS2_ESYS_RC_MEMORY: if the ESAPI cannot allocate enough memory for |
| * internal operations or return parameters. |
| * @retval TSS2_ESYS_RC_BAD_SEQUENCE: if the context has an asynchronous |
| * operation already pending. |
| * @retval TSS2_ESYS_RC_INSUFFICIENT_RESPONSE: if the TPM's response does not |
| * at least contain the tag, response length, and response code. |
| * @retval TSS2_ESYS_RC_MALFORMED_RESPONSE: if the TPM's response is corrupted. |
| * @retval TSS2_ESYS_RC_MULTIPLE_DECRYPT_SESSIONS: if more than one session has |
| * the 'decrypt' attribute bit set. |
| * @retval TSS2_ESYS_RC_MULTIPLE_ENCRYPT_SESSIONS: if more than one session has |
| * the 'encrypt' attribute bit set. |
| * @retval TSS2_ESYS_RC_BAD_TR: if any of the ESYS_TR objects are unknown to the |
| * ESYS_CONTEXT or are of the wrong type or if required ESYS_TR objects |
| * are ESYS_TR_NONE. |
| * @retval TSS2_RCs produced by lower layers of the software stack may be |
| * returned to the caller unaltered unless handled internally. |
| */ |
| TSS2_RC |
| Esys_PolicySigned( |
| ESYS_CONTEXT *esysContext, |
| ESYS_TR authObject, |
| ESYS_TR policySession, |
| ESYS_TR shandle1, |
| ESYS_TR shandle2, |
| ESYS_TR shandle3, |
| const TPM2B_NONCE *nonceTPM, |
| const TPM2B_DIGEST *cpHashA, |
| const TPM2B_NONCE *policyRef, |
| INT32 expiration, |
| const TPMT_SIGNATURE *auth, |
| TPM2B_TIMEOUT **timeout, |
| TPMT_TK_AUTH **policyTicket) |
| { |
| TSS2_RC r; |
| |
| r = Esys_PolicySigned_Async(esysContext, |
| authObject, |
| policySession, |
| shandle1, |
| shandle2, |
| shandle3, |
| nonceTPM, |
| cpHashA, |
| policyRef, |
| expiration, |
| auth); |
| return_if_error(r, "Error in async function"); |
| |
| /* Set the timeout to indefinite for now, since we want _Finish to block */ |
| int32_t timeouttmp = esysContext->timeout; |
| esysContext->timeout = -1; |
| /* |
| * Now we call the finish function, until return code is not equal to |
| * from TSS2_BASE_RC_TRY_AGAIN. |
| * Note that the finish function may return TSS2_RC_TRY_AGAIN, even if we |
| * have set the timeout to -1. This occurs for example if the TPM requests |
| * a retransmission of the command via TPM2_RC_YIELDED. |
| */ |
| do { |
| r = Esys_PolicySigned_Finish(esysContext, |
| timeout, |
| policyTicket); |
| /* This is just debug information about the reattempt to finish the |
| command */ |
| if ((r & ~TSS2_RC_LAYER_MASK) == TSS2_BASE_RC_TRY_AGAIN) |
| LOG_DEBUG("A layer below returned TRY_AGAIN: %" PRIx32 |
| " => resubmitting command", r); |
| } while ((r & ~TSS2_RC_LAYER_MASK) == TSS2_BASE_RC_TRY_AGAIN); |
| |
| /* Restore the timeout value to the original value */ |
| esysContext->timeout = timeouttmp; |
| return_if_error(r, "Esys Finish"); |
| |
| return TSS2_RC_SUCCESS; |
| } |
| |
| /** Asynchronous function for TPM2_PolicySigned |
| * |
| * This function invokes the TPM2_PolicySigned command in a asynchronous |
| * variant. This means the function will return as soon as the command has been |
| * sent downwards the stack to the TPM. All input parameters are const. |
| * In order to retrieve the TPM's response call Esys_PolicySigned_Finish. |
| * |
| * @param[in,out] esysContext The ESYS_CONTEXT. |
| * @param[in] authObject Handle for a key that will validate the signature. |
| * @param[in] policySession Handle for the policy session being extended. |
| * @param[in] shandle1 First session handle. |
| * @param[in] shandle2 Second session handle. |
| * @param[in] shandle3 Third session handle. |
| * @param[in] nonceTPM The policy nonce for the session. |
| * @param[in] cpHashA Digest of the command parameters to which this |
| * authorization is limited. |
| * @param[in] policyRef A reference to a policy relating to the authorization - |
| * may be the Empty Buffer. |
| * @param[in] expiration Time when authorization will expire, measured in seconds |
| * from the time that nonceTPM was generated. |
| * @param[in] auth Signed authorization (not optional). |
| * @retval ESYS_RC_SUCCESS if the function call was a success. |
| * @retval TSS2_ESYS_RC_BAD_REFERENCE if the esysContext or required input |
| * pointers or required output handle references are NULL. |
| * @retval TSS2_ESYS_RC_BAD_CONTEXT: if esysContext corruption is detected. |
| * @retval TSS2_ESYS_RC_MEMORY: if the ESAPI cannot allocate enough memory for |
| * internal operations or return parameters. |
| * @retval TSS2_RCs produced by lower layers of the software stack may be |
| returned to the caller unaltered unless handled internally. |
| * @retval TSS2_ESYS_RC_MULTIPLE_DECRYPT_SESSIONS: if more than one session has |
| * the 'decrypt' attribute bit set. |
| * @retval TSS2_ESYS_RC_MULTIPLE_ENCRYPT_SESSIONS: if more than one session has |
| * the 'encrypt' attribute bit set. |
| * @retval TSS2_ESYS_RC_BAD_TR: if any of the ESYS_TR objects are unknown to the |
| ESYS_CONTEXT or are of the wrong type or if required ESYS_TR objects |
| are ESYS_TR_NONE. |
| */ |
| TSS2_RC |
| Esys_PolicySigned_Async( |
| ESYS_CONTEXT *esysContext, |
| ESYS_TR authObject, |
| ESYS_TR policySession, |
| ESYS_TR shandle1, |
| ESYS_TR shandle2, |
| ESYS_TR shandle3, |
| const TPM2B_NONCE *nonceTPM, |
| const TPM2B_DIGEST *cpHashA, |
| const TPM2B_NONCE *policyRef, |
| INT32 expiration, |
| const TPMT_SIGNATURE *auth) |
| { |
| TSS2_RC r; |
| LOG_TRACE("context=%p, authObject=%"PRIx32 ", policySession=%"PRIx32 "," |
| "nonceTPM=%p, cpHashA=%p, policyRef=%p," |
| "expiration=%"PRIi32 ", auth=%p", |
| esysContext, authObject, policySession, nonceTPM, cpHashA, |
| policyRef, expiration, auth); |
| TSS2L_SYS_AUTH_COMMAND auths; |
| RSRC_NODE_T *authObjectNode; |
| RSRC_NODE_T *policySessionNode; |
| |
| /* Check context, sequence correctness and set state to error for now */ |
| if (esysContext == NULL) { |
| LOG_ERROR("esyscontext is NULL."); |
| return TSS2_ESYS_RC_BAD_REFERENCE; |
| } |
| r = iesys_check_sequence_async(esysContext); |
| if (r != TSS2_RC_SUCCESS) |
| return r; |
| esysContext->state = _ESYS_STATE_INTERNALERROR; |
| |
| /* Check and store input parameters */ |
| r = check_session_feasibility(shandle1, shandle2, shandle3, 0); |
| return_state_if_error(r, _ESYS_STATE_INIT, "Check session usage"); |
| store_input_parameters(esysContext, authObject, policySession, |
| nonceTPM, |
| cpHashA, |
| policyRef, |
| expiration, |
| auth); |
| |
| /* Retrieve the metadata objects for provided handles */ |
| r = esys_GetResourceObject(esysContext, authObject, &authObjectNode); |
| return_state_if_error(r, _ESYS_STATE_INIT, "authObject unknown."); |
| r = esys_GetResourceObject(esysContext, policySession, &policySessionNode); |
| return_state_if_error(r, _ESYS_STATE_INIT, "policySession unknown."); |
| |
| /* Initial invocation of SAPI to prepare the command buffer with parameters */ |
| r = Tss2_Sys_PolicySigned_Prepare(esysContext->sys, |
| (authObjectNode == NULL) ? TPM2_RH_NULL : authObjectNode->rsrc.handle, |
| (policySessionNode == NULL) ? TPM2_RH_NULL : policySessionNode->rsrc.handle, |
| nonceTPM, |
| cpHashA, |
| policyRef, |
| expiration, |
| auth); |
| return_state_if_error(r, _ESYS_STATE_INIT, "SAPI Prepare returned error."); |
| |
| /* Calculate the cpHash Values */ |
| r = init_session_tab(esysContext, shandle1, shandle2, shandle3); |
| return_state_if_error(r, _ESYS_STATE_INIT, "Initialize session resources"); |
| iesys_compute_session_value(esysContext->session_tab[0], NULL, NULL); |
| iesys_compute_session_value(esysContext->session_tab[1], NULL, NULL); |
| iesys_compute_session_value(esysContext->session_tab[2], NULL, NULL); |
| |
| /* Generate the auth values and set them in the SAPI command buffer */ |
| r = iesys_gen_auths(esysContext, authObjectNode, policySessionNode, NULL, &auths); |
| return_state_if_error(r, _ESYS_STATE_INIT, "Error in computation of auth values"); |
| esysContext->authsCount = auths.count; |
| r = Tss2_Sys_SetCmdAuths(esysContext->sys, &auths); |
| return_state_if_error(r, _ESYS_STATE_INIT, "SAPI error on SetCmdAuths"); |
| |
| /* Trigger execution and finish the async invocation */ |
| r = Tss2_Sys_ExecuteAsync(esysContext->sys); |
| return_state_if_error(r, _ESYS_STATE_INTERNALERROR, "Finish (Execute Async)"); |
| |
| esysContext->state = _ESYS_STATE_SENT; |
| |
| return r; |
| } |
| |
| /** Asynchronous finish function for TPM2_PolicySigned |
| * |
| * This function returns the results of a TPM2_PolicySigned command |
| * invoked via Esys_PolicySigned_Finish. All non-simple output parameters |
| * are allocated by the function's implementation. NULL can be passed for every |
| * output parameter if the value is not required. |
| * |
| * @param[in,out] esysContext The ESYS_CONTEXT. |
| * @param[out] timeout Implementation-specific time value, used to indicate to the |
| * TPM when the ticket expires. |
| * (callee-allocated) |
| * @param[out] policyTicket Produced if the command succeeds and expiration in the |
| * command was non-zero; this ticket will use the |
| * TPMT_ST_AUTH_SIGNED structure tag. See 23.2.5. |
| * (callee-allocated) |
| * @retval TSS2_RC_SUCCESS on success |
| * @retval ESYS_RC_SUCCESS if the function call was a success. |
| * @retval TSS2_ESYS_RC_BAD_REFERENCE if the esysContext or required input |
| * pointers or required output handle references are NULL. |
| * @retval TSS2_ESYS_RC_BAD_CONTEXT: if esysContext corruption is detected. |
| * @retval TSS2_ESYS_RC_MEMORY: if the ESAPI cannot allocate enough memory for |
| * internal operations or return parameters. |
| * @retval TSS2_ESYS_RC_BAD_SEQUENCE: if the context has an asynchronous |
| * operation already pending. |
| * @retval TSS2_ESYS_RC_TRY_AGAIN: if the timeout counter expires before the |
| * TPM response is received. |
| * @retval TSS2_ESYS_RC_INSUFFICIENT_RESPONSE: if the TPM's response does not |
| * at least contain the tag, response length, and response code. |
| * @retval TSS2_ESYS_RC_MALFORMED_RESPONSE: if the TPM's response is corrupted. |
| * @retval TSS2_RCs produced by lower layers of the software stack may be |
| * returned to the caller unaltered unless handled internally. |
| */ |
| TSS2_RC |
| Esys_PolicySigned_Finish( |
| ESYS_CONTEXT *esysContext, |
| TPM2B_TIMEOUT **timeout, |
| TPMT_TK_AUTH **policyTicket) |
| { |
| TSS2_RC r; |
| LOG_TRACE("context=%p, timeout=%p, policyTicket=%p", |
| esysContext, timeout, policyTicket); |
| |
| if (esysContext == NULL) { |
| LOG_ERROR("esyscontext is NULL."); |
| return TSS2_ESYS_RC_BAD_REFERENCE; |
| } |
| |
| /* Check for correct sequence and set sequence to irregular for now */ |
| if (esysContext->state != _ESYS_STATE_SENT) { |
| LOG_ERROR("Esys called in bad sequence."); |
| return TSS2_ESYS_RC_BAD_SEQUENCE; |
| } |
| esysContext->state = _ESYS_STATE_INTERNALERROR; |
| |
| /* Allocate memory for response parameters */ |
| if (timeout != NULL) { |
| *timeout = calloc(sizeof(TPM2B_TIMEOUT), 1); |
| if (*timeout == NULL) { |
| return_error(TSS2_ESYS_RC_MEMORY, "Out of memory"); |
| } |
| } |
| if (policyTicket != NULL) { |
| *policyTicket = calloc(sizeof(TPMT_TK_AUTH), 1); |
| if (*policyTicket == NULL) { |
| goto_error(r, TSS2_ESYS_RC_MEMORY, "Out of memory", error_cleanup); |
| } |
| } |
| |
| /*Receive the TPM response and handle resubmissions if necessary. */ |
| r = Tss2_Sys_ExecuteFinish(esysContext->sys, esysContext->timeout); |
| if ((r & ~TSS2_RC_LAYER_MASK) == TSS2_BASE_RC_TRY_AGAIN) { |
| LOG_DEBUG("A layer below returned TRY_AGAIN: %" PRIx32, r); |
| esysContext->state = _ESYS_STATE_SENT; |
| goto error_cleanup; |
| } |
| /* This block handle the resubmission of TPM commands given a certain set of |
| * TPM response codes. */ |
| if (r == TPM2_RC_RETRY || r == TPM2_RC_TESTING || r == TPM2_RC_YIELDED) { |
| LOG_DEBUG("TPM returned RETRY, TESTING or YIELDED, which triggers a " |
| "resubmission: %" PRIx32, r); |
| if (esysContext->submissionCount >= _ESYS_MAX_SUBMISSIONS) { |
| LOG_WARNING("Maximum number of (re)submissions has been reached."); |
| esysContext->state = _ESYS_STATE_INIT; |
| goto error_cleanup; |
| } |
| esysContext->state = _ESYS_STATE_RESUBMISSION; |
| r = Esys_PolicySigned_Async(esysContext, |
| esysContext->in.PolicySigned.authObject, |
| esysContext->in.PolicySigned.policySession, |
| esysContext->session_type[0], |
| esysContext->session_type[1], |
| esysContext->session_type[2], |
| esysContext->in.PolicySigned.nonceTPM, |
| esysContext->in.PolicySigned.cpHashA, |
| esysContext->in.PolicySigned.policyRef, |
| esysContext->in.PolicySigned.expiration, |
| esysContext->in.PolicySigned.auth); |
| if (r != TSS2_RC_SUCCESS) { |
| LOG_WARNING("Error attempting to resubmit"); |
| /* We do not set esysContext->state here but inherit the most recent |
| * state of the _async function. */ |
| goto error_cleanup; |
| } |
| r = TSS2_ESYS_RC_TRY_AGAIN; |
| LOG_DEBUG("Resubmission initiated and returning RC_TRY_AGAIN."); |
| goto error_cleanup; |
| } |
| /* The following is the "regular error" handling. */ |
| if (iesys_tpm_error(r)) { |
| LOG_WARNING("Received TPM Error"); |
| esysContext->state = _ESYS_STATE_INIT; |
| goto error_cleanup; |
| } else if (r != TSS2_RC_SUCCESS) { |
| LOG_ERROR("Received a non-TPM Error"); |
| esysContext->state = _ESYS_STATE_INTERNALERROR; |
| goto error_cleanup; |
| } |
| |
| /* |
| * Now the verification of the response (hmac check) and if necessary the |
| * parameter decryption have to be done. |
| */ |
| r = iesys_check_response(esysContext); |
| goto_state_if_error(r, _ESYS_STATE_INTERNALERROR, "Error: check response", |
| error_cleanup); |
| /* |
| * After the verification of the response we call the complete function |
| * to deliver the result. |
| */ |
| r = Tss2_Sys_PolicySigned_Complete(esysContext->sys, |
| (timeout != NULL) ? *timeout : NULL, |
| (policyTicket != NULL) ? *policyTicket : NULL); |
| goto_state_if_error(r, _ESYS_STATE_INTERNALERROR, "Received error from SAPI" |
| " unmarshaling" ,error_cleanup); |
| esysContext->state = _ESYS_STATE_INIT; |
| |
| return TSS2_RC_SUCCESS; |
| |
| error_cleanup: |
| if (timeout != NULL) |
| SAFE_FREE(*timeout); |
| if (policyTicket != NULL) |
| SAFE_FREE(*policyTicket); |
| |
| return r; |
| } |