diff options
Diffstat (limited to 'src/libtpmtss/tpm_tss_trousers.c')
-rw-r--r-- | src/libtpmtss/tpm_tss_trousers.c | 655 |
1 files changed, 655 insertions, 0 deletions
diff --git a/src/libtpmtss/tpm_tss_trousers.c b/src/libtpmtss/tpm_tss_trousers.c new file mode 100644 index 000000000..8be3ad877 --- /dev/null +++ b/src/libtpmtss/tpm_tss_trousers.c @@ -0,0 +1,655 @@ +/* + * Copyright (C) 2016 Andreas Steffen + * HSR Hochschule fuer Technik Rapperswil + * + * Copyright (c) 2008 Hal Finney + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + +#include "tpm_tss_trousers.h" + +#ifdef TSS_TROUSERS + +#ifdef _BASETSD_H_ +/* MinGW defines _BASETSD_H_, but TSS checks for _BASETSD_H */ +# define _BASETSD_H +#endif + +#include <trousers/tss.h> +#include <trousers/trousers.h> + +#define LABEL "TPM 1.2 -" + +/* size in bytes of a TSS AIK public key blob */ +#define AIK_PUBKEY_BLOB_SIZE 284 + +/* maximum number of PCR registers */ +#define PCR_NUM_MAX 24 + +typedef struct private_tpm_tss_trousers_t private_tpm_tss_trousers_t; +typedef struct aik_t aik_t; + +/** + * Private data of an tpm_tss_trousers_t object. + */ +struct private_tpm_tss_trousers_t { + + /** + * Public tpm_tss_trousers_t interface. + */ + tpm_tss_trousers_t interface; + + /** + * TSS context + */ + TSS_HCONTEXT hContext; + + /** + * TPM handle + */ + TSS_HTPM hTPM; + + /** + * TPM version info + */ + chunk_t version_info; + + /** + * List of AIKs retrievable by an object handle + */ + linked_list_t *aik_list; + +}; + +struct aik_t { + /** AIK object handle */ + uint32_t handle; + + /** AIK private key blob */ + chunk_t blob; + + /** AIK public key */ + chunk_t pubkey; +}; + +static void free_aik(aik_t *this) +{ + free(this->blob.ptr); + free(this->pubkey.ptr); + free(this); +} + +/** + * Initialize TSS context + * + * TPM 1.2 Specification, Part 2 TPM Structures, 21.6 TPM_CAP_VERSION_INFO + * + * typedef struct tdTPM_VERSION { + * TPM_VERSION_BYTE major; + * TPM_VERSION_BYTE minor; + * BYTE revMajor; + * BYTE revMinor; + * } TPM_VERSION; + * + * typedef struct tdTPM_CAP_VERSION_INFO { + * TPM_STRUCTURE_TAG tag; + * TPM_VERSION version; + * UINT16 specLevel; + * BYTE errataRev; + * BYTE tpmVendorID[4]; + * UINT16 vendorSpecificSize; + * [size_is(vendorSpecificSize)] BYTE* vendorSpecific; + * } TPM_CAP_VERSION_INFO; + */ +static bool initialize_context(private_tpm_tss_trousers_t *this) +{ + uint8_t *version_ptr; + uint32_t version_len; + + TSS_RESULT result; + TPM_CAP_VERSION_INFO *info; + + result = Tspi_Context_Create(&this->hContext); + if (result != TSS_SUCCESS) + { + DBG1(DBG_PTS, "%s could not created context: 0x%x", + LABEL, result); + return FALSE; + } + + result = Tspi_Context_Connect(this->hContext, NULL); + if (result != TSS_SUCCESS) + { + DBG1(DBG_PTS, "%s could not connect with context: 0x%x", + LABEL, result); + return FALSE; + } + + result = Tspi_Context_GetTpmObject (this->hContext, &this->hTPM); + if (result != TSS_SUCCESS) + { + DBG1(DBG_PTS, "%s could not get TPM object: 0x%x", + LABEL, result); + return FALSE; + } + + result = Tspi_TPM_GetCapability(this->hTPM, TSS_TPMCAP_VERSION_VAL, 0, + NULL, &version_len, &version_ptr); + if (result != TSS_SUCCESS) + { + DBG1(DBG_PTS, "%s Tspi_TPM_GetCapability failed: 0x%x", + LABEL, result); + return FALSE; + } + + info = (TPM_CAP_VERSION_INFO *)version_ptr; + DBG2(DBG_PTS, "TPM Version Info: Chip Version: %u.%u.%u.%u, " + "Spec Level: %u, Errata Rev: %u, Vendor ID: %.4s", + info->version.major, info->version.minor, + info->version.revMajor, info->version.revMinor, + untoh16(&info->specLevel), info->errataRev, info->tpmVendorID); + + this->version_info = chunk_clone(chunk_create(version_ptr, version_len)); + + return TRUE; +} + +/** + * Finalize TSS context + */ +static void finalize_context(private_tpm_tss_trousers_t *this) +{ + if (this->hContext) + { + Tspi_Context_FreeMemory(this->hContext, NULL); + Tspi_Context_Close(this->hContext); + } +} + +METHOD(tpm_tss_t, get_version, tpm_version_t, + private_tpm_tss_trousers_t *this) +{ + return TPM_VERSION_1_2; +} + +METHOD(tpm_tss_t, get_version_info, chunk_t, + private_tpm_tss_trousers_t *this) +{ + return this->version_info; +} + +METHOD(tpm_tss_t, generate_aik, bool, + private_tpm_tss_trousers_t *this, chunk_t ca_modulus, chunk_t *aik_blob, + chunk_t *aik_pubkey, chunk_t *identity_req) +{ + chunk_t aik_pubkey_blob; + chunk_t aik_modulus; + chunk_t aik_exponent; + + TSS_RESULT result; + TSS_HKEY hSRK; + TSS_HKEY hPCAKey; + TSS_HPOLICY hSrkPolicy; + TSS_HPOLICY hTPMPolicy; + TSS_HKEY hIdentKey; + TSS_UUID SRK_UUID = TSS_UUID_SRK; + BYTE secret[] = TSS_WELL_KNOWN_SECRET; + BYTE *IdentityReq; + UINT32 IdentityReqLen; + BYTE *blob; + UINT32 blobLen; + + /* get SRK plus SRK policy and set SRK secret */ + result = Tspi_Context_LoadKeyByUUID(this->hContext, TSS_PS_TYPE_SYSTEM, + SRK_UUID, &hSRK); + if (result != TSS_SUCCESS) + { + DBG1(DBG_PTS, "%s Tspi_Context_LoadKeyByUUID for SRK failed: 0x%x", + LABEL, result); + return FALSE; + } + result = Tspi_GetPolicyObject(hSRK, TSS_POLICY_USAGE, &hSrkPolicy); + if (result != TSS_SUCCESS) + { + DBG1(DBG_PTS, "%s Tspi_GetPolicyObject or SRK failed: 0x%x ", + LABEL, result); + return FALSE; + } + result = Tspi_Policy_SetSecret(hSrkPolicy, TSS_SECRET_MODE_SHA1, 20, secret); + if (result != TSS_SUCCESS) + { + DBG1(DBG_PTS, "%s Tspi_Policy_SetSecret for SRK failed: 0x%x ", + LABEL, result); + return FALSE; + } + + /* get TPM plus TPM policy and set TPM secret */ + result = Tspi_Context_GetTpmObject (this->hContext, &this->hTPM); + if (result != TSS_SUCCESS) + { + DBG1(DBG_PTS, "%s Tspi_Context_GetTpmObject failed: 0x%x", + LABEL, result); + return FALSE; + } + result = Tspi_GetPolicyObject(this->hTPM, TSS_POLICY_USAGE, &hTPMPolicy); + if (result != TSS_SUCCESS) + { + DBG1(DBG_PTS, "%s Tspi_GetPolicyObject for TPM failed: 0x%x", + LABEL, result); + return FALSE; + } + result = Tspi_Policy_SetSecret(hTPMPolicy, TSS_SECRET_MODE_SHA1, 20, secret); + if (result != TSS_SUCCESS) + { + DBG1(DBG_PTS,"%s Tspi_Policy_SetSecret for TPM failed: 0x%x", + LABEL, result); + return FALSE; + } + + /* create context for a 2048 bit AIK */ + result = Tspi_Context_CreateObject(this->hContext, TSS_OBJECT_TYPE_RSAKEY, + TSS_KEY_TYPE_IDENTITY | TSS_KEY_SIZE_2048 | + TSS_KEY_VOLATILE | TSS_KEY_NOT_MIGRATABLE, &hIdentKey); + if (result != TSS_SUCCESS) + { + DBG1(DBG_PTS, "%s Tspi_Context_CreateObject for key failed: 0x%x", + LABEL, result); + return FALSE; + } + + /* create context for the Privacy CA public key and assign modulus */ + result = Tspi_Context_CreateObject(this->hContext, TSS_OBJECT_TYPE_RSAKEY, + TSS_KEY_TYPE_LEGACY|TSS_KEY_SIZE_2048, &hPCAKey); + if (result != TSS_SUCCESS) + { + DBG1(DBG_PTS, "%s Tspi_Context_CreateObject for PCA failed: 0x%x", + LABEL, result); + return FALSE; + } + result = Tspi_SetAttribData (hPCAKey, TSS_TSPATTRIB_RSAKEY_INFO, + TSS_TSPATTRIB_KEYINFO_RSA_MODULUS, ca_modulus.len, + ca_modulus.ptr); + if (result != TSS_SUCCESS) + { + DBG1(DBG_PTS, "%s Tspi_SetAttribData for PCA modulus failed: 0x%x", + LABEL, result); + return FALSE; + } + result = Tspi_SetAttribUint32(hPCAKey, TSS_TSPATTRIB_KEY_INFO, + TSS_TSPATTRIB_KEYINFO_ENCSCHEME, TSS_ES_RSAESPKCSV15); + if (result != TSS_SUCCESS) + { + DBG1(DBG_PTS,"%s Tspi_SetAttribUint32 for PCA encryption scheme " + "failed: 0x%x", LABEL, result); + return FALSE; + } + + /* generate AIK */ + DBG1(DBG_LIB, "Generating identity key..."); + result = Tspi_TPM_CollateIdentityRequest(this->hTPM, hSRK, hPCAKey, 0, NULL, + hIdentKey, TSS_ALG_AES, &IdentityReqLen, &IdentityReq); + if (result != TSS_SUCCESS) + { + DBG1(DBG_PTS, "%s Tspi_TPM_CollateIdentityRequest failed: 0x%x", + LABEL, result); + return FALSE; + } + *identity_req = chunk_create(IdentityReq, IdentityReqLen); + DBG3(DBG_LIB, "%s Identity Request: %B", LABEL, identity_req); + + /* load identity key */ + result = Tspi_Key_LoadKey (hIdentKey, hSRK); + if (result != TSS_SUCCESS) + { + DBG1(DBG_PTS, "%s Tspi_Key_LoadKey for AIK failed: 0x%x", + LABEL, result); + return FALSE; + } + + /* output AIK private key in TSS blob format */ + result = Tspi_GetAttribData (hIdentKey, TSS_TSPATTRIB_KEY_BLOB, + TSS_TSPATTRIB_KEYBLOB_BLOB, &blobLen, &blob); + if (result != TSS_SUCCESS) + { + DBG1(DBG_PTS, "%s Tspi_GetAttribData for private key blob failed: 0x%x", + LABEL, result); + return FALSE; + } + *aik_blob = chunk_create(blob, blobLen); + DBG3(DBG_LIB, "%s AIK private key blob: %B", LABEL, aik_blob); + + /* output AIK Public Key in TSS blob format */ + result = Tspi_GetAttribData (hIdentKey, TSS_TSPATTRIB_KEY_BLOB, + TSS_TSPATTRIB_KEYBLOB_PUBLIC_KEY, &blobLen, &blob); + if (result != TSS_SUCCESS) + { + DBG1(DBG_PTS, "%s Tspi_GetAttribData for public key blob failed: 0x%x", + LABEL, result); + return FALSE; + } + aik_pubkey_blob = chunk_create(blob, blobLen); + DBG3(DBG_LIB, "%s AIK public key blob: %B", LABEL, &aik_pubkey_blob); + + /* create a trusted AIK public key */ + if (aik_pubkey_blob.len != AIK_PUBKEY_BLOB_SIZE) + { + DBG1(DBG_PTS, "%s AIK public key is not in TSS blob format", + LABEL); + return FALSE; + } + aik_modulus = chunk_skip(aik_pubkey_blob, AIK_PUBKEY_BLOB_SIZE - 256); + aik_exponent = chunk_from_chars(0x01, 0x00, 0x01); + + /* output subjectPublicKeyInfo encoding of AIK public key */ + if (!lib->encoding->encode(lib->encoding, PUBKEY_SPKI_ASN1_DER, NULL, + aik_pubkey, CRED_PART_RSA_MODULUS, aik_modulus, + CRED_PART_RSA_PUB_EXP, aik_exponent, CRED_PART_END)) + { + DBG1(DBG_PTS, "%s subjectPublicKeyInfo encoding of AIK key failed", + LABEL); + return FALSE; + } + return TRUE; +} + +METHOD(tpm_tss_t, get_public, chunk_t, + private_tpm_tss_trousers_t *this, uint32_t handle) +{ + enumerator_t *enumerator; + chunk_t aik_pubkey = chunk_empty; + aik_t *aik; + + enumerator = this->aik_list->create_enumerator(this->aik_list); + while (enumerator->enumerate(enumerator, &aik)) + { + if (aik->handle == handle) + { + aik_pubkey = chunk_clone(aik->pubkey); + break; + } + } + enumerator->destroy(enumerator); + + return aik_pubkey; +} + +METHOD(tpm_tss_t, read_pcr, bool, + private_tpm_tss_trousers_t *this, uint32_t pcr_num, chunk_t *pcr_value, + hash_algorithm_t alg) +{ + TSS_RESULT result; + uint8_t *value; + uint32_t len; + + result = Tspi_TPM_PcrRead(this->hTPM, pcr_num, &len, &value); + if (result != TSS_SUCCESS) + { + DBG1(DBG_PTS, "%s Tspi_TPM_PcrRead failed: 0x%x", LABEL, result); + return FALSE; + } + *pcr_value = chunk_clone(chunk_create(value, len)); + + return TRUE; +} + +METHOD(tpm_tss_t, extend_pcr, bool, + private_tpm_tss_trousers_t *this, uint32_t pcr_num, chunk_t *pcr_value, + chunk_t data, hash_algorithm_t alg) +{ + TSS_RESULT result; + uint32_t pcr_len; + uint8_t *pcr_ptr; + + result = Tspi_TPM_PcrExtend(this->hTPM, pcr_num, data.len, data.ptr, + NULL, &pcr_len, &pcr_ptr); + if (result != TSS_SUCCESS) + { + DBG1(DBG_PTS, "%s Tspi_TPM_PcrExtend failed: 0x%x", LABEL, result); + return FALSE; + } + *pcr_value = chunk_clone(chunk_create(pcr_ptr, pcr_len)); + + return TRUE; +} + +METHOD(tpm_tss_t, quote, bool, + private_tpm_tss_trousers_t *this, uint32_t aik_handle, uint32_t pcr_sel, + hash_algorithm_t alg, chunk_t data, tpm_quote_mode_t *quote_mode, + tpm_tss_quote_info_t **quote_info, chunk_t *quote_sig) +{ + TSS_HKEY hAIK; + TSS_HKEY hSRK; + TSS_HPOLICY srkUsagePolicy; + TSS_UUID SRK_UUID = TSS_UUID_SRK; + TSS_HPCRS hPcrComposite; + TSS_VALIDATION valData; + TSS_RESULT result; + uint8_t secret[] = TSS_WELL_KNOWN_SECRET; + uint8_t *version_info, *comp_hash; + uint32_t version_info_size, pcr; + aik_t *aik; + chunk_t aik_blob = chunk_empty; + chunk_t quote_chunk, pcr_digest; + enumerator_t *enumerator; + bool success = FALSE; + + /* Retrieve SRK from TPM and set the authentication to well known secret*/ + result = Tspi_Context_LoadKeyByUUID(this->hContext, TSS_PS_TYPE_SYSTEM, + SRK_UUID, &hSRK); + if (result != TSS_SUCCESS) + { + DBG1(DBG_PTS, "%s Tspi_Context_LoadKeyByUUID for SRK failed: 0x%x", + LABEL, result); + return FALSE; + } + result = Tspi_GetPolicyObject(hSRK, TSS_POLICY_USAGE, &srkUsagePolicy); + if (result != TSS_SUCCESS) + { + DBG1(DBG_PTS, "%s Tspi_GetPolicyObject for SRK failed: 0x%x", + LABEL, result); + return FALSE; + } + result = Tspi_Policy_SetSecret(srkUsagePolicy, TSS_SECRET_MODE_SHA1, + 20, secret); + if (result != TSS_SUCCESS) + { + DBG1(DBG_PTS, "%s Tspi_Policy_SetSecret for SRK failed: 0x%x", + LABEL, result); + return FALSE; + } + + /* Retrieve AIK using its handle and load private key into TPM 1.2 */ + enumerator = this->aik_list->create_enumerator(this->aik_list); + while (enumerator->enumerate(enumerator, &aik)) + { + if (aik->handle == aik_handle) + { + aik_blob = aik->blob; + break; + } + } + enumerator->destroy(enumerator); + + if (aik_blob.len == 0) + { + DBG1(DBG_PTS, "%s AIK private key for handle 0x%80x not found", LABEL); + return FALSE; + } + result = Tspi_Context_LoadKeyByBlob(this->hContext, hSRK, aik_blob.len, + aik_blob.ptr, &hAIK); + if (result != TSS_SUCCESS) + { + DBG1(DBG_PTS, "%s Tspi_Context_LoadKeyByBlob for AIK failed: 0x%x", + LABEL, result); + return FALSE; + } + + /* Create PCR composite object */ + result = Tspi_Context_CreateObject(this->hContext, TSS_OBJECT_TYPE_PCRS, + (*quote_mode == TPM_QUOTE) ? TSS_PCRS_STRUCT_INFO : + TSS_PCRS_STRUCT_INFO_SHORT, + &hPcrComposite); + if (result != TSS_SUCCESS) + { + DBG1(DBG_PTS, "%s Tspi_Context_CreateObject for pcrComposite failed: " + "0x%x", LABEL, result); + goto err1; + } + + /* Select PCRs */ + for (pcr = 0; pcr < PCR_NUM_MAX; pcr++) + { + if (pcr_sel & (1 << pcr)) + { + result = (*quote_mode == TPM_QUOTE) ? + Tspi_PcrComposite_SelectPcrIndex(hPcrComposite, pcr) : + Tspi_PcrComposite_SelectPcrIndexEx(hPcrComposite, pcr, + TSS_PCRS_DIRECTION_RELEASE); + if (result != TSS_SUCCESS) + { + DBG1(DBG_PTS, "%s Tspi_PcrComposite_SelectPcrIndex failed: " + "0x%x", LABEL, result); + goto err2; + } + } + } + + /* Set the Validation Data */ + valData.ulExternalDataLength = data.len; + valData.rgbExternalData = data.ptr; + + /* TPM Quote */ + result = (*quote_mode == TPM_QUOTE) ? + Tspi_TPM_Quote (this->hTPM, hAIK, hPcrComposite, &valData) : + Tspi_TPM_Quote2(this->hTPM, hAIK, + *quote_mode == TPM_QUOTE2_VERSION_INFO, + hPcrComposite, &valData, &version_info_size, + &version_info); + if (result != TSS_SUCCESS) + { + DBG1(DBG_PTS, "%s Tspi_TPM_Quote%s failed: 0x%x", LABEL, + (*quote_mode == TPM_QUOTE) ? "" : "2", result); + goto err2; + } + + if (*quote_mode == TPM_QUOTE) + { + /* TPM_Composite_Hash starts at byte 8 of TPM_Quote_Info structure */ + comp_hash = valData.rgbData + 8; + } + else + { + /* TPM_Composite_Hash is last 20 bytes of TPM_Quote_Info2 structure */ + comp_hash = valData.rgbData + valData.ulDataLength - version_info_size - + HASH_SIZE_SHA1; + } + pcr_digest = chunk_create(comp_hash, HASH_SIZE_SHA1); + DBG2(DBG_PTS, "PCR composite digest: %B", &pcr_digest); + + quote_chunk = chunk_create(valData.rgbData, valData.ulDataLength); + DBG2(DBG_PTS, "TPM Quote Info: %B", "e_chunk); + + *quote_info = tpm_tss_quote_info_create(*quote_mode, HASH_SHA1, pcr_digest); + + *quote_sig = chunk_clone(chunk_create(valData.rgbValidationData, + valData.ulValidationDataLength)); + DBG2(DBG_PTS, "TPM Quote Signature: %B", quote_sig); + + success = TRUE; + +err2: + Tspi_Context_CloseObject(this->hContext, hPcrComposite); +err1: + Tspi_Context_CloseObject(this->hContext, hAIK); + + return success; +} + +METHOD(tpm_tss_t, destroy, void, + private_tpm_tss_trousers_t *this) +{ + finalize_context(this); + this->aik_list->destroy_function(this->aik_list, (void*)free_aik); + free(this->version_info.ptr); + free(this); +} + +METHOD(tpm_tss_trousers_t, load_aik, void, + private_tpm_tss_trousers_t *this, chunk_t blob, chunk_t pubkey, + uint32_t handle) +{ + aik_t *item; + + INIT(item, + .handle = handle, + .blob = blob, + .pubkey = pubkey, + ); + + this->aik_list->insert_last(this->aik_list, item); +} + +/** + * See header + */ +tpm_tss_t *tpm_tss_trousers_create() +{ + private_tpm_tss_trousers_t *this; + bool available; + + INIT(this, + .interface = { + .public = { + .get_version = _get_version, + .get_version_info = _get_version_info, + .generate_aik = _generate_aik, + .get_public = _get_public, + .read_pcr = _read_pcr, + .quote = _quote, + .extend_pcr = _extend_pcr, + .destroy = _destroy, + }, + .load_aik = _load_aik, + }, + .aik_list = linked_list_create(), + ); + + available = initialize_context(this); + DBG1(DBG_PTS, "TPM 1.2 via TrouSerS %savailable", available ? "" : "not "); + + if (!available) + { + destroy(this); + return NULL; + } + return &this->interface.public; +} + +#else /* TSS_TROUSERS */ + +tpm_tss_t *tpm_tss_trousers_create() +{ + return NULL; +} + +#endif /* TSS_TROUSERS */ + + + |