Implemented Quote Digest constructing function for IMV
Implemented Signature verification function to check TPM Quote Signature Implemented Handling of Simple Evidence Final attribute Fixed bug within tpm_quote function
This commit is contained in:
Sansar Choinyambuu
Andreas Steffen
parent
7037b55ff1
commit
a8be826be4
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@ -321,8 +321,8 @@ bool imc_attestation_process(pa_tnc_attr_t *attr, linked_list_t *attr_list,
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/* TODO: Implement BIOS measurement */
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DBG1(DBG_IMC, "experimental implementation:"
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" Extend TPM with etc/tnc_config file");
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params.flags = PTS_SIMPLE_COMP_EVID_FLAG_PCR | PTS_SIMPLE_COMP_EVID_FLAG_NO_VALID;
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params.pcr_info_included = TRUE;
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params.flags = PTS_SIMPLE_COMP_EVID_FLAG_NO_VALID;
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params.depth = 0;
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params.vendor_id = PEN_TCG;
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@ -335,7 +335,7 @@ bool imc_attestation_process(pa_tnc_attr_t *attr, linked_list_t *attr_list,
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params.extended_pcr = EXTEND_PCR;
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params.hash_algorithm = pts->get_meas_algorithm(pts);
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if (!(params.flags & PTS_SIMPLE_COMP_EVID_FLAG_PCR))
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if (!params.pcr_info_included)
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{
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params.transformation = PTS_PCR_TRANSFORM_NO;
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}
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@ -464,11 +464,11 @@ bool imc_attestation_process(pa_tnc_attr_t *attr, linked_list_t *attr_list,
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DESTROY_IF(evidences);
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return FALSE;
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}
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/* Send Simple Evidence Final attribute */
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flags = PTS_SIMPLE_EVID_FINAL_FLAG_TPM_QUOTE_INFO;
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attr = tcg_pts_attr_simple_evid_final_create(flags, 0,
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attr = tcg_pts_attr_simple_evid_final_create(FALSE, flags, 0,
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pcr_composite, quote_signature, chunk_empty);
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attr_list->insert_last(attr_list, attr);
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@ -176,6 +176,7 @@ bool imv_attestation_process(pa_tnc_attr_t *attr, linked_list_t *attr_list,
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case TCG_PTS_SIMPLE_COMP_EVID:
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{
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tcg_pts_attr_simple_comp_evid_t *attr_cast;
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bool pcr_info_inclided;
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pts_attr_simple_comp_evid_flag_t flags;
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u_int32_t depth, comp_vendor_id, extended_pcr;
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u_int8_t family, measurement_type;
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@ -188,7 +189,8 @@ bool imv_attestation_process(pa_tnc_attr_t *attr, linked_list_t *attr_list,
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attr_cast = (tcg_pts_attr_simple_comp_evid_t*)attr;
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attr_info = attr->get_value(attr);
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pcr_info_inclided = attr_cast->is_pcr_info_included(attr_cast);
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flags = attr_cast->get_flags(attr_cast);
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depth = attr_cast->get_sub_component_depth(attr_cast);
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/* TODO: Implement checking of components with its sub-components */
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@ -241,14 +243,14 @@ bool imv_attestation_process(pa_tnc_attr_t *attr, linked_list_t *attr_list,
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measurement_time = attr_cast->get_measurement_time(attr_cast);
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/* Call getters of optional fields when corresponding flag is set */
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if (flags & PTS_SIMPLE_COMP_EVID_FLAG_PCR)
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if (pcr_info_inclided)
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{
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extended_pcr = attr_cast->get_extended_pcr(attr_cast);
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pcr_before = attr_cast->get_pcr_before_value(attr_cast);
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pcr_after = attr_cast->get_pcr_after_value(attr_cast);
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measurement = attr_cast->get_comp_measurement(attr_cast);
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}
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if (!(flags & PTS_SIMPLE_COMP_EVID_FLAG_NO_VALID))
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if (flags != PTS_SIMPLE_COMP_EVID_FLAG_NO_VALID)
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{
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policy_uri = attr_cast->get_policy_uri(attr_cast);
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}
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@ -262,27 +264,62 @@ bool imv_attestation_process(pa_tnc_attr_t *attr, linked_list_t *attr_list,
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{
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tcg_pts_attr_simple_evid_final_t *attr_cast;
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pts_simple_evid_final_flag_t flags;
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chunk_t pcr_comp = chunk_empty;
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chunk_t tpm_quote_sign = chunk_empty;
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chunk_t evid_sign = chunk_empty;
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chunk_t pcr_comp;
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chunk_t tpm_quote_sign;
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chunk_t evid_sign;
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bool evid_signature_included;
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/** TODO: Ignoring Composite Hash Algorithm field
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* No flag defined which indicates the precense of it
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*/
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attr_cast = (tcg_pts_attr_simple_evid_final_t*)attr;
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evid_signature_included = attr_cast->is_evid_sign_included(attr_cast);
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flags = attr_cast->get_flags(attr_cast);
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if ((flags >> 6) & PTS_SIMPLE_EVID_FINAL_FLAG_NO)
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if ((flags == PTS_SIMPLE_EVID_FINAL_FLAG_TPM_QUOTE_INFO2) ||
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(flags == PTS_SIMPLE_EVID_FINAL_FLAG_TPM_QUOTE_INFO2_CAP_VER))
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{
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DBG1(DBG_IMV, "This version of Attestation IMV can not handle"
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" TPM Quote Info2 structure");
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break;
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}
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if (flags == PTS_SIMPLE_EVID_FINAL_FLAG_TPM_QUOTE_INFO)
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{
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chunk_t digest;
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pcr_comp = attr_cast->get_pcr_comp(attr_cast);
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tpm_quote_sign = attr_cast->get_tpm_quote_sign(attr_cast);
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/** TODO: Construct PCR Composite */
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if (!pts->get_quote_digest(pts, &digest))
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{
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DBG1(DBG_IMV, "unable to contruct TPM Quote Digest");
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chunk_clear(&digest);
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return FALSE;
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}
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if (!pts->verify_quote_signature(pts, digest, tpm_quote_sign))
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{
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DBG1(DBG_IMV, "signature verification failed");
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chunk_clear(&digest);
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return FALSE;
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}
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DBG2(DBG_IMV, "signature verification succeeded for TPM Quote Info");
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if (!chunk_equals(digest, pcr_comp))
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{
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DBG1(DBG_IMV, "calculated TPM Quote Info differs from received");
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DBG1(DBG_IMV, "calculated: %B", &digest);
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DBG1(DBG_IMV, "received: %B", &pcr_comp);
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chunk_clear(&digest);
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}
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chunk_clear(&digest);
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}
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if (flags & PTS_SIMPLE_EVID_FINAL_FLAG_EVID)
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if (evid_signature_included)
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{
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/** TODO: What to do with Evidence Signature */
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evid_sign = attr_cast->get_evid_sign(attr_cast);
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DBG1(DBG_IMV, "This version of Attestation IMV can not handle"
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" Optional Evidence Signature field");
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}
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break;
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@ -17,6 +17,10 @@
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#include <debug.h>
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#include <crypto/hashers/hasher.h>
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#include <bio/bio_writer.h>
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#include <bio/bio_reader.h>
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/* for isdigit()*/
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#include <ctype.h>
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#include <trousers/tss.h>
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#include <trousers/trousers.h>
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@ -25,10 +29,6 @@
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#include <sys/utsname.h>
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#include <errno.h>
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#include <openssl/asn1t.h>
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#include <openssl/x509.h>
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#include <openssl/rsa.h>
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#define PTS_BUF_SIZE 4096
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typedef struct private_pts_t private_pts_t;
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@ -822,10 +822,9 @@ METHOD(pts_t, quote_tpm, bool,
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BYTE secret[] = TSS_WELL_KNOWN_SECRET;
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TSS_HPCRS hPcrComposite;
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TSS_VALIDATION valData;
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TPM_QUOTE_INFO *quoteInfo;
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u_int32_t i;
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TSS_RESULT result;
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chunk_t pcr_composite_without_nonce;
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chunk_t pcr_comp, quote_sign;
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result = Tspi_Context_Create(&hContext);
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if (result != TSS_SUCCESS)
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@ -897,6 +896,7 @@ METHOD(pts_t, quote_tpm, bool,
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valData.ulExternalDataLength = this->secret.len;
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valData.rgbExternalData = (BYTE *)this->secret.ptr;
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/* TPM Quote */
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result = Tspi_TPM_Quote(hTPM, hAIK, hPcrComposite, &valData);
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if (result != TSS_SUCCESS)
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@ -904,8 +904,6 @@ METHOD(pts_t, quote_tpm, bool,
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goto err4;
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}
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quoteInfo = (TPM_QUOTE_INFO *)valData.rgbData;
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/* Display quote info */
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DBG3(DBG_PTS, "version:");
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for(i = 0 ; i < 4 ; i++)
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@ -929,17 +927,22 @@ METHOD(pts_t, quote_tpm, bool,
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}
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/* Set output chunks */
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pcr_composite_without_nonce = chunk_alloc(
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valData.ulDataLength - ASSESSMENT_SECRET_LEN);
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memcpy(pcr_composite_without_nonce.ptr, valData.rgbData,
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valData.ulDataLength - ASSESSMENT_SECRET_LEN);
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*pcr_composite = pcr_composite_without_nonce;
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pcr_comp = chunk_alloc(valData.ulDataLength - ASSESSMENT_SECRET_LEN);
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memcpy(pcr_comp.ptr, valData.rgbData,
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valData.ulDataLength - ASSESSMENT_SECRET_LEN);
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*pcr_composite = pcr_comp;
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*pcr_composite = chunk_clone(*pcr_composite);
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free(pcr_composite_without_nonce.ptr);
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DBG3(DBG_PTS, "PCR comp: %B",pcr_composite);
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*quote_signature = chunk_from_thing(valData.rgbValidationData);
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quote_sign = chunk_alloc(valData.ulValidationDataLength);
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memcpy(quote_sign.ptr, valData.rgbValidationData,
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valData.ulValidationDataLength);
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*quote_signature = quote_sign;
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*quote_signature = chunk_clone(*quote_signature);
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DBG3(DBG_PTS, "Quote sign: %B",quote_signature);
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chunk_clear(&pcr_comp);
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chunk_clear("e_sign);
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Tspi_Context_FreeMemory(hContext, NULL);
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Tspi_Context_CloseObject(hContext, hPcrComposite);
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Tspi_Context_CloseObject(hContext, hAIK);
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@ -964,6 +967,254 @@ METHOD(pts_t, quote_tpm, bool,
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return FALSE;
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}
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/**
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* Convert from string to byte array (configured PCR values)
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*/
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static u_int8_t* pcr_string_to_bytearray(char *str_value)
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{
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u_int32_t i;
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u_int8_t *ret;
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if (strlen(str_value) != PCR_LEN * 2)
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{
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DBG1(DBG_PTS, "expected PCR value with %d characters, current:%B",
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PCR_LEN * 2, &str_value);
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return NULL;
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}
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ret = malloc(PCR_LEN);
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for (i = 0; i < strlen(str_value)/2; i++)
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{
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char c1, c2;
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u_int8_t d1, d2;
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c1 = str_value[i*2];
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c2 = str_value[i*2 + 1];
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/**
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* Convert characters to u_int8_t
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* code taken from http://www.codeguru.com/forum/showthread.php?t=316299
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*/
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if (isdigit(c1))
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{
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d1 = c1 - '0';
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}
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else if (c1 >= 'A' && c1 <= 'F')
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{
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d1 = c1 - 'A' + 10;
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}
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else if (c1 >= 'a' && c1 <= 'f')
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{
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d1 = c1 - 'a' + 10;
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}
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if (isdigit(c2))
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{
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d2 = c2 - '0';
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}
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else if (c2 >= 'A' && c2 <= 'F')
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{
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d2 = c2 - 'A' + 10;
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}
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else if (c2 >= 'a' && c2 <= 'f')
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{
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d2 = c2 - 'a' + 10;
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}
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/* save value of two characters in one byte */
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ret[i] = d1*16 + d2;
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}
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return ret;
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}
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/**
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* Build PCR Entries from the configuration
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*/
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static bool load_pcr_entries(linked_list_t **output)
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{
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linked_list_t *entries;
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int i, len;
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entries = linked_list_create();
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for(i = 0; i < MAX_NUM_PCR; i++)
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{
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char *string_pcr_value;
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pcr_entry_t *entry;
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len = snprintf(NULL, 0, "%s%d", "libimcv.plugins.imv-attestation.pcr", i);
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char var[len + 1];
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len = snprintf(var, len + 1, "%s%d", "libimcv.plugins.imv-attestation.pcr", i);
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string_pcr_value = lib->settings->get_str(lib->settings, var, NULL);
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if (string_pcr_value)
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{
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u_int8_t *pcr_value;
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entry = malloc_thing(pcr_entry_t);
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entry->pcr_number = i;
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pcr_value = pcr_string_to_bytearray(string_pcr_value);
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entry->pcr_value = chunk_from_thing(pcr_value);
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entries->insert_last(entries, entry);
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}
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}
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if (entries->get_count(entries))
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{
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*output = entries;
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return TRUE;
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}
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DBG1(DBG_PTS, "pcr value(s) not available");
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DESTROY_IF(entries);
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*output = NULL;
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return FALSE;
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}
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/**
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* 1. build a TCPA_PCR_COMPOSITE structure which contains (pcrCompositeBuf)
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* TCPA_PCR_SELECTION structure (bitmask length network order + length bytes bitmask)
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* UINT32 (network order) gives the number of bytes following (pcr entries * 20)
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* TCPA_PCRVALUE[] with the pcr values
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*
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* The first two bytes of the message represent the length
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* of the bitmask that follows. The bitmask represents the
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* requested PCRs to be quoted.
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*
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* TPM Main-Part 2 TPM Structures_v1.2 8.1
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* The bitmask is in big endian order"
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*
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* BYTE 1 BYTE 2 ...
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* Bit: 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 ...
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* Pcr: 7 6 5 4 3 2 1 0 15 14 13 12 11 10 9 8 ...
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*
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* 2. SHA1(pcrCompositeBuf)
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*
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* 3. build a TCPA_QUOTE_INFO structure which contains
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* 4 bytes of version
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* 4 bytes 'Q' 'U' 'O' 'T'
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* 20 byte SHA1 of TCPA_PCR_COMPOSITE
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* 20 byte nonce
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*
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* 4. SHA1(TCPA_QUOTE_INFO) gives quoteDigest
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*/
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static chunk_t calculate_quote_digest(private_pts_t *this, linked_list_t *pcr_entries)
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{
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enumerator_t *e;
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pcr_entry_t *pcr_entry;
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chunk_t digest, pcr_composite, hash_pcr_composite;
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u_int32_t pcr_composite_len;
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bio_writer_t *writer;
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u_int8_t mask_bytes[MAX_NUM_PCR / 8], i;
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hasher_t *hasher;
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pcr_composite_len = 2 + (MAX_NUM_PCR / 8) + 4 +
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pcr_entries->get_count(pcr_entries) * PCR_LEN;
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writer = bio_writer_create(pcr_composite_len);
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/* Lenght of the bist mask field */
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writer->write_uint16(writer, (MAX_NUM_PCR / 8));
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/* Bit mask indicating selected PCRs */
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e = pcr_entries->create_enumerator(pcr_entries);
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while (e->enumerate(e, &pcr_entry))
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{
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u_int32_t index = pcr_entry->pcr_number;
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mask_bytes[index / 8] |= (1 << (index % 8));
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}
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e->destroy(e);
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for (i = 0; i< (MAX_NUM_PCR / 8) ; i++)
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{
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writer->write_uint8(writer, mask_bytes[i]);
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}
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/* Lenght of the pcr entries */
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writer->write_uint32(writer, pcr_entries->get_count(pcr_entries) * PCR_LEN);
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/* Actual PCR values */
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e = pcr_entries->create_enumerator(pcr_entries);
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while (e->enumerate(e, &pcr_entry))
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{
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writer->write_data(writer, pcr_entry->pcr_value);
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}
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pcr_composite = chunk_clone(writer->get_buf(writer));
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writer->destroy(writer);
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writer = bio_writer_create(TPM_QUOTE_INFO_LEN);
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/* Version number */
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writer->write_uint8(writer, 1);
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writer->write_uint8(writer, 1);
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writer->write_uint8(writer, 0);
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writer->write_uint8(writer, 0);
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/* Magic QUOT value, depends on TPM Ordinal */
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writer->write_uint8(writer, 'Q');
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writer->write_uint8(writer, 'U');
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writer->write_uint8(writer, 'O');
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writer->write_uint8(writer, 'T');
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/* SHA1 hash of PCR Composite Structure */
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hasher = lib->crypto->create_hasher(lib->crypto, HASH_SHA1);
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hasher->allocate_hash(hasher, pcr_composite, &hash_pcr_composite);
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writer->write_data(writer, hash_pcr_composite);
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/* Secret assessment value 20 bytes (nonce) */
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writer->write_data(writer, this->secret);
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/* TPM Quote Info expected from IMC */
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digest = chunk_clone(writer->get_buf(writer));
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e->destroy(e);
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||||
writer->destroy(writer);
|
||||
hasher->destroy(hasher);
|
||||
chunk_clear(&pcr_composite);
|
||||
chunk_clear(&hash_pcr_composite);
|
||||
pcr_entries->destroy(pcr_entries);
|
||||
|
||||
return digest;
|
||||
}
|
||||
|
||||
METHOD(pts_t, get_quote_digest, bool,
|
||||
private_pts_t *this, chunk_t *digest)
|
||||
{
|
||||
linked_list_t *entries;
|
||||
|
||||
if (!load_pcr_entries(&entries))
|
||||
{
|
||||
DBG1(DBG_PTS, "failed to load PCR entries");
|
||||
//DESTROY_IF(entries);
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
*digest = calculate_quote_digest(this, entries);
|
||||
//DESTROY_IF(entries);
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
METHOD(pts_t, verify_quote_signature, bool,
|
||||
private_pts_t *this, chunk_t data, chunk_t signature)
|
||||
{
|
||||
public_key_t *aik_pub_key;
|
||||
|
||||
aik_pub_key = this->aik->get_public_key(this->aik);
|
||||
|
||||
if (!aik_pub_key)
|
||||
{
|
||||
DBG1(DBG_PTS, "failed to get public key from AIK certificate");
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
if (!aik_pub_key->verify(aik_pub_key, SIGN_RSA_EMSA_PKCS1_SHA1, data, signature))
|
||||
{
|
||||
DBG1(DBG_PTS, "signature verification failed for TPM Quote Info");
|
||||
aik_pub_key->destroy(aik_pub_key);
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
aik_pub_key->destroy(aik_pub_key);
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
METHOD(pts_t, destroy, void,
|
||||
private_pts_t *this)
|
||||
{
|
||||
|
|
@ -971,6 +1222,7 @@ METHOD(pts_t, destroy, void,
|
|||
DESTROY_IF(this->dh);
|
||||
free(this->initiator_nonce.ptr);
|
||||
free(this->responder_nonce.ptr);
|
||||
free(this->secret.ptr);
|
||||
free(this->platform_info);
|
||||
free(this->aik_blob.ptr);
|
||||
free(this->tpm_version_info.ptr);
|
||||
|
|
@ -1157,6 +1409,8 @@ pts_t *pts_create(bool is_imc)
|
|||
.read_pcr = _read_pcr,
|
||||
.extend_pcr = _extend_pcr,
|
||||
.quote_tpm = _quote_tpm,
|
||||
.get_quote_digest = _get_quote_digest,
|
||||
.verify_quote_signature = _verify_quote_signature,
|
||||
.destroy = _destroy,
|
||||
},
|
||||
.is_imc = is_imc,
|
||||
|
|
@ -1184,4 +1438,3 @@ pts_t *pts_create(bool is_imc)
|
|||
|
||||
return &this->public;
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -22,6 +22,7 @@
|
|||
#define PTS_H_
|
||||
|
||||
typedef struct pts_t pts_t;
|
||||
typedef struct pcr_entry_t pcr_entry_t;
|
||||
|
||||
#include "pts_error.h"
|
||||
#include "pts_proto_caps.h"
|
||||
|
|
@ -54,6 +55,19 @@ typedef struct pts_t pts_t;
|
|||
*/
|
||||
#define PCR_LEN 20
|
||||
|
||||
/**
|
||||
* Lenght of the TPM_QUOTE_INFO structure, TPM Spec 1.2
|
||||
*/
|
||||
#define TPM_QUOTE_INFO_LEN 48
|
||||
|
||||
/**
|
||||
* PCR Entry structure which contains PCR number and current value
|
||||
*/
|
||||
struct pcr_entry_t {
|
||||
u_int32_t pcr_number;
|
||||
chunk_t pcr_value;
|
||||
};
|
||||
|
||||
/**
|
||||
* Class implementing the TCG Platform Trust Service (PTS)
|
||||
*
|
||||
|
|
@ -254,6 +268,23 @@ struct pts_t {
|
|||
bool (*quote_tpm)(pts_t *this, u_int32_t *pcrs, u_int32_t num_of_pcrs,
|
||||
chunk_t *pcr_composite, chunk_t *quote_signature);
|
||||
|
||||
/**
|
||||
* Constructs and returns PCR Quote Digest structure expected from IMC
|
||||
*
|
||||
* @param digest Output variable to store quote digest
|
||||
* @return FALSE in case of any error, TRUE otherwise
|
||||
*/
|
||||
bool (*get_quote_digest)(pts_t *this, chunk_t *digest);
|
||||
|
||||
/**
|
||||
* Constructs and returns PCR Quote Digest structure expected from IMC
|
||||
*
|
||||
* @param data Calculated TPM Quote Digest
|
||||
* @param signature TPM Quote Signature received from IMC
|
||||
* @return FALSE in case signature is not verified, TRUE otherwise
|
||||
*/
|
||||
bool (*verify_quote_signature)(pts_t *this, chunk_t data, chunk_t signature);
|
||||
|
||||
/**
|
||||
* Destroys a pts_t object.
|
||||
*/
|
||||
|
|
|
|||
Loading…
Reference in New Issue