strongswan/src/libimcv/pts/pts.c

/*
 * Copyright (C) 2011-2012 Sansar Choinyambuu
 * Copyright (C) 2012-2014 Andreas Steffen
 * HSR Hochschule fuer Technik Rapperswil
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 */

#include "pts.h"

#include <utils/debug.h>
#include <crypto/hashers/hasher.h>
#include <bio/bio_writer.h>
#include <bio/bio_reader.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>
#else
#ifndef TPM_TAG_QUOTE_INFO2
#define TPM_TAG_QUOTE_INFO2 0x0036
#endif
#ifndef TPM_LOC_ZERO
#define TPM_LOC_ZERO 0x01
#endif
#endif

#include <sys/types.h>
#include <sys/stat.h>
#include <libgen.h>
#include <unistd.h>
#include <errno.h>

typedef struct private_pts_t private_pts_t;

/**
 * Private data of a pts_t object.
 *
 */
struct private_pts_t {

	/**
	 * Public pts_t interface.
	 */
	pts_t public;

	/**
	 * PTS Protocol Capabilities
	 */
	pts_proto_caps_flag_t proto_caps;

	/**
	 * PTS Measurement Algorithm
	 */
	pts_meas_algorithms_t algorithm;

	/**
	 * DH Hash Algorithm
	 */
	pts_meas_algorithms_t dh_hash_algorithm;

	/**
	 * PTS Diffie-Hellman Secret
	 */
	diffie_hellman_t *dh;

	/**
	 * PTS Diffie-Hellman Initiator Nonce
	 */
	chunk_t initiator_nonce;

	/**
	 * PTS Diffie-Hellman Responder Nonce
	 */
	chunk_t responder_nonce;

	/**
	 * Secret assessment value to be used for TPM Quote as an external data
	 */
	chunk_t secret;

	/**
	 * Primary key of platform entry in database
	 */
	int platform_id;

	/**
	 * TRUE if IMC-PTS, FALSE if IMV-PTS
	 */
	bool is_imc;

	/**
	 * Do we have an activated TPM
	 */
	bool has_tpm;

	/**
	 * Contains a TPM_CAP_VERSION_INFO struct
	 */
	chunk_t tpm_version_info;

	/**
	 * Contains TSS Blob structure for AIK
	 */
	chunk_t aik_blob;

	/**
	 * Contains a Attestation Identity Key or Certificate
	 */
 	certificate_t *aik;

	/**
	 * Primary key referening AIK in database
	 */
	int aik_id;

	/**
	 * Shadow PCR set
	 */
	pts_pcr_t *pcrs;

};

METHOD(pts_t, get_proto_caps, pts_proto_caps_flag_t,
	   private_pts_t *this)
{
	return this->proto_caps;
}

METHOD(pts_t, set_proto_caps, void,
	private_pts_t *this, pts_proto_caps_flag_t flags)
{
	this->proto_caps = flags;
	DBG2(DBG_PTS, "supported PTS protocol capabilities: %s%s%s%s%s",
		 flags & PTS_PROTO_CAPS_C ? "C" : ".",
		 flags & PTS_PROTO_CAPS_V ? "V" : ".",
		 flags & PTS_PROTO_CAPS_D ? "D" : ".",
		 flags & PTS_PROTO_CAPS_T ? "T" : ".",
		 flags & PTS_PROTO_CAPS_X ? "X" : ".");
}

METHOD(pts_t, get_meas_algorithm, pts_meas_algorithms_t,
	private_pts_t *this)
{
	return this->algorithm;
}

METHOD(pts_t, set_meas_algorithm, void,
	private_pts_t *this, pts_meas_algorithms_t algorithm)
{
	hash_algorithm_t hash_alg;

	hash_alg = pts_meas_algo_to_hash(algorithm);
	DBG2(DBG_PTS, "selected PTS measurement algorithm is %N",
				   hash_algorithm_names, hash_alg);
	if (hash_alg != HASH_UNKNOWN)
	{
		this->algorithm = algorithm;
	}
}

METHOD(pts_t, get_dh_hash_algorithm, pts_meas_algorithms_t,
	private_pts_t *this)
{
	return this->dh_hash_algorithm;
}

METHOD(pts_t, set_dh_hash_algorithm, void,
	private_pts_t *this, pts_meas_algorithms_t algorithm)
{
	hash_algorithm_t hash_alg;

	hash_alg = pts_meas_algo_to_hash(algorithm);
	DBG2(DBG_PTS, "selected DH hash algorithm is %N",
				   hash_algorithm_names, hash_alg);
	if (hash_alg != HASH_UNKNOWN)
	{
		this->dh_hash_algorithm = algorithm;
	}
}


METHOD(pts_t, create_dh_nonce, bool,
	private_pts_t *this, pts_dh_group_t group, int nonce_len)
{
	diffie_hellman_group_t dh_group;
	chunk_t *nonce;
	rng_t *rng;

	dh_group = pts_dh_group_to_ike(group);
	DBG2(DBG_PTS, "selected PTS DH group is %N",
				   diffie_hellman_group_names, dh_group);
	DESTROY_IF(this->dh);
	this->dh = lib->crypto->create_dh(lib->crypto, dh_group);

	rng = lib->crypto->create_rng(lib->crypto, RNG_STRONG);
	if (!rng)
	{
		DBG1(DBG_PTS, "no rng available");
		return FALSE;
	}
	DBG2(DBG_PTS, "nonce length is %d", nonce_len);
	nonce = this->is_imc ? &this->responder_nonce : &this->initiator_nonce;
	chunk_free(nonce);
	if (!rng->allocate_bytes(rng, nonce_len, nonce))
	{
		DBG1(DBG_PTS, "failed to allocate nonce");
		rng->destroy(rng);
		return FALSE;
	}
	rng->destroy(rng);
	return TRUE;
}

METHOD(pts_t, get_my_public_value, bool,
	private_pts_t *this, chunk_t *value, chunk_t *nonce)
{
	if (!this->dh->get_my_public_value(this->dh, value))
	{
		return FALSE;
	}
	*nonce = this->is_imc ? this->responder_nonce : this->initiator_nonce;
	return TRUE;
}

METHOD(pts_t, set_peer_public_value, bool,
	private_pts_t *this, chunk_t value, chunk_t nonce)
{
	if (!this->dh->set_other_public_value(this->dh, value))
	{
		return FALSE;
	}

	nonce = chunk_clone(nonce);
	if (this->is_imc)
	{
		this->initiator_nonce = nonce;
	}
	else
	{
		this->responder_nonce = nonce;
	}
	return TRUE;
}

METHOD(pts_t, calculate_secret, bool,
	private_pts_t *this)
{
	hasher_t *hasher;
	hash_algorithm_t hash_alg;
	chunk_t shared_secret;

	/* Check presence of nonces */
	if (!this->initiator_nonce.len || !this->responder_nonce.len)
	{
		DBG1(DBG_PTS, "initiator and/or responder nonce is not available");
		return FALSE;
	}
	DBG3(DBG_PTS, "initiator nonce: %B", &this->initiator_nonce);
	DBG3(DBG_PTS, "responder nonce: %B", &this->responder_nonce);

	/* Calculate the DH secret */
	if (!this->dh->get_shared_secret(this->dh, &shared_secret))
	{
		DBG1(DBG_PTS, "shared DH secret computation failed");
		return FALSE;
	}
	DBG3(DBG_PTS, "shared DH secret: %B", &shared_secret);

	/* Calculate the secret assessment value */
	hash_alg = pts_meas_algo_to_hash(this->dh_hash_algorithm);
	hasher = lib->crypto->create_hasher(lib->crypto, hash_alg);

	if (!hasher ||
		!hasher->get_hash(hasher, chunk_from_chars('1'), NULL) ||
		!hasher->get_hash(hasher, this->initiator_nonce, NULL) ||
		!hasher->get_hash(hasher, this->responder_nonce, NULL) ||
		!hasher->allocate_hash(hasher, shared_secret, &this->secret))
	{
		DESTROY_IF(hasher);
		return FALSE;
	}
	hasher->destroy(hasher);

	/* The DH secret must be destroyed */
	chunk_clear(&shared_secret);

	/*
	 * Truncate the hash to 20 bytes to fit the ExternalData
	 * argument of the TPM Quote command
	 */
	this->secret.len = min(this->secret.len, 20);
	DBG3(DBG_PTS, "secret assessment value: %B", &this->secret);
	return TRUE;
}

#ifdef TSS_TROUSERS

/**
 * Print TPM 1.2 Version Info
 */
static void print_tpm_version_info(private_pts_t *this)
{
	TPM_CAP_VERSION_INFO *info;

	info = (TPM_CAP_VERSION_INFO*)this->tpm_version_info.ptr;

	if (this->tpm_version_info.len >=
			sizeof(*info) - sizeof(info->vendorSpecific))
	{
		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);
	}
	else
	{
		DBG1(DBG_PTS, "could not parse tpm version info");
	}
}

#else

static void print_tpm_version_info(private_pts_t *this)
{
	DBG1(DBG_PTS, "unknown TPM version: no TSS implementation available");
}

#endif /* TSS_TROUSERS */

METHOD(pts_t, get_platform_id, int,
	private_pts_t *this)
{
	return this->platform_id;
}

METHOD(pts_t, set_platform_id, void,
	private_pts_t *this, int pid)
{
	this->platform_id = pid;
}

METHOD(pts_t, get_tpm_version_info, bool,
	private_pts_t *this, chunk_t *info)
{
	if (!this->has_tpm)
	{
		return FALSE;
	}
	*info = this->tpm_version_info;
	print_tpm_version_info(this);
	return TRUE;
}

METHOD(pts_t, set_tpm_version_info, void,
	private_pts_t *this, chunk_t info)
{
	this->tpm_version_info = chunk_clone(info);
	print_tpm_version_info(this);
}

/**
 * Load an AIK Blob (TSS_TSPATTRIB_KEYBLOB_BLOB attribute)
 */
static void load_aik_blob(private_pts_t *this)
{
	char *path;
	chunk_t *map;

	path = lib->settings->get_str(lib->settings,
						"%s.plugins.imc-attestation.aik_blob", NULL, lib->ns);
	if (path)
	{
		map = chunk_map(path, FALSE);
		if (map)
		{
			DBG2(DBG_PTS, "loaded AIK Blob from '%s'", path);
			DBG3(DBG_PTS, "AIK Blob: %B", map);
			this->aik_blob = chunk_clone(*map);
			chunk_unmap(map);
		}
		else
		{
			DBG1(DBG_PTS, "unable to map AIK Blob file '%s': %s",
				 path, strerror(errno));
		}
	}
	else
	{
		DBG1(DBG_PTS, "AIK Blob is not available");
	}
}

/**
 * Load an AIK certificate or public key
 * the certificate having precedence over the public key if both are present
 */
static void load_aik(private_pts_t *this)
{
	char *cert_path, *key_path;

	cert_path = lib->settings->get_str(lib->settings,
						"%s.plugins.imc-attestation.aik_cert", NULL, lib->ns);
	key_path = lib->settings->get_str(lib->settings,
						"%s.plugins.imc-attestation.aik_pubkey", NULL, lib->ns);

	if (cert_path)
	{
		this->aik = lib->creds->create(lib->creds, CRED_CERTIFICATE,
									   CERT_X509, BUILD_FROM_FILE,
									   cert_path, BUILD_END);
		if (this->aik)
		{
			DBG2(DBG_PTS, "loaded AIK certificate from '%s'", cert_path);
			return;
		}
	}
	if (key_path)
	{
		this->aik = lib->creds->create(lib->creds, CRED_CERTIFICATE,
									   CERT_TRUSTED_PUBKEY, BUILD_FROM_FILE,
									   key_path, BUILD_END);
		if (this->aik)
		{
			DBG2(DBG_PTS, "loaded AIK public key from '%s'", key_path);
			return;
		}
	}

	DBG1(DBG_PTS, "neither AIK certificate nor public key is available");
}

METHOD(pts_t, get_aik, certificate_t*,
	private_pts_t *this)
{
	return this->aik;
}

METHOD(pts_t, set_aik, void,
	private_pts_t *this, certificate_t *aik, int aik_id)
{
	DESTROY_IF(this->aik);
	this->aik = aik->get_ref(aik);
	this->aik_id = aik_id;
}

METHOD(pts_t, get_aik_id, int,
	private_pts_t *this)
{
	return this->aik_id;
}

METHOD(pts_t, is_path_valid, bool,
	private_pts_t *this, char *path, pts_error_code_t *error_code)
{
	struct stat st;

	*error_code = 0;

	if (!stat(path, &st))
	{
		return TRUE;
	}
	else if (errno == ENOENT || errno == ENOTDIR)
	{
		DBG1(DBG_PTS, "file/directory does not exist %s", path);
		*error_code = TCG_PTS_FILE_NOT_FOUND;
	}
	else if (errno == EFAULT)
	{
		DBG1(DBG_PTS, "bad address %s", path);
		*error_code = TCG_PTS_INVALID_PATH;
	}
	else
	{
		DBG1(DBG_PTS, "error: %s occurred while validating path: %s",
			 		   strerror(errno), path);
		return FALSE;
	}

	return TRUE;
}

/**
 * Obtain statistical information describing a file
 */
static bool file_metadata(char *pathname, pts_file_metadata_t **entry)
{
	struct stat st;
	pts_file_metadata_t *this;

	this = malloc_thing(pts_file_metadata_t);

	if (stat(pathname, &st))
	{
		DBG1(DBG_PTS, "unable to obtain statistics about '%s'", pathname);
		free(this);
		return FALSE;
	}

	if (S_ISREG(st.st_mode))
	{
		this->type = PTS_FILE_REGULAR;
	}
	else if (S_ISDIR(st.st_mode))
	{
		this->type = PTS_FILE_DIRECTORY;
	}
	else if (S_ISCHR(st.st_mode))
	{
		this->type = PTS_FILE_CHAR_SPEC;
	}
	else if (S_ISBLK(st.st_mode))
	{
		this->type = PTS_FILE_BLOCK_SPEC;
	}
	else if (S_ISFIFO(st.st_mode))
	{
		this->type = PTS_FILE_FIFO;
	}
#ifndef WIN32
	else if (S_ISLNK(st.st_mode))
	{
		this->type = PTS_FILE_SYM_LINK;
	}
	else if (S_ISSOCK(st.st_mode))
	{
		this->type = PTS_FILE_SOCKET;
	}
#endif /* WIN32 */
	else
	{
		this->type = PTS_FILE_OTHER;
	}

	this->filesize = st.st_size;
	this->created =  st.st_ctime;
	this->modified = st.st_mtime;
	this->accessed = st.st_atime;
	this->owner =    st.st_uid;
	this->group =    st.st_gid;

	*entry = this;
	return TRUE;
}

METHOD(pts_t, get_metadata, pts_file_meta_t*,
	private_pts_t *this, char *pathname, bool is_directory)
{
	pts_file_meta_t *metadata;
	pts_file_metadata_t *entry;

	/* Create a metadata object */
	metadata = pts_file_meta_create();

	if (is_directory)
	{
		enumerator_t *enumerator;
		char *rel_name, *abs_name;
		struct stat st;

		enumerator = enumerator_create_directory(pathname);
		if (!enumerator)
		{
			DBG1(DBG_PTS,"  directory '%s' can not be opened, %s", pathname,
				 strerror(errno));
			metadata->destroy(metadata);
			return NULL;
		}
		while (enumerator->enumerate(enumerator, &rel_name, &abs_name, &st))
		{
			/* measure regular files only */
			if (S_ISREG(st.st_mode) && *rel_name != '.')
			{
				if (!file_metadata(abs_name, &entry))
				{
					enumerator->destroy(enumerator);
					metadata->destroy(metadata);
					return NULL;
				}
				entry->filename = strdup(rel_name);
				metadata->add(metadata, entry);
			}
		}
		enumerator->destroy(enumerator);
	}
	else
	{
		if (!file_metadata(pathname, &entry))
		{
			metadata->destroy(metadata);
			return NULL;
		}
		entry->filename = path_basename(pathname);
		metadata->add(metadata, entry);
	}

	return metadata;
}


#ifdef TSS_TROUSERS

METHOD(pts_t, read_pcr, bool,
	private_pts_t *this, u_int32_t pcr_num, chunk_t *pcr_value)
{
	TSS_HCONTEXT hContext;
	TSS_HTPM hTPM;
	TSS_RESULT result;
	BYTE *buf;
	UINT32 len;

	bool success = FALSE;

	result = Tspi_Context_Create(&hContext);
	if (result != TSS_SUCCESS)
	{
		DBG1(DBG_PTS, "TPM context could not be created: tss error 0x%x", result);
		return FALSE;
	}

	result = Tspi_Context_Connect(hContext, NULL);
	if (result != TSS_SUCCESS)
	{
		goto err;
	}
	result = Tspi_Context_GetTpmObject (hContext, &hTPM);
	if (result != TSS_SUCCESS)
	{
		goto err;
	}
	result = Tspi_TPM_PcrRead(hTPM, pcr_num, &len, &buf);
	if (result != TSS_SUCCESS)
	{
		goto err;
	}
	*pcr_value = chunk_clone(chunk_create(buf, len));
	DBG3(DBG_PTS, "PCR %d value:%B", pcr_num, pcr_value);
	success = TRUE;

err:
	if (!success)
	{
		DBG1(DBG_PTS, "TPM not available: tss error 0x%x", result);
	}
	Tspi_Context_FreeMemory(hContext, NULL);
	Tspi_Context_Close(hContext);

	return success;
}

METHOD(pts_t, extend_pcr, bool,
	private_pts_t *this, u_int32_t pcr_num, chunk_t input, chunk_t *output)
{
	TSS_HCONTEXT hContext;
	TSS_HTPM hTPM;
	TSS_RESULT result;
	u_int32_t pcr_length;
	chunk_t pcr_value = chunk_empty;

	result = Tspi_Context_Create(&hContext);
	if (result != TSS_SUCCESS)
	{
		DBG1(DBG_PTS, "TPM context could not be created: tss error 0x%x",
			 result);
		return FALSE;
	}
	result = Tspi_Context_Connect(hContext, NULL);
	if (result != TSS_SUCCESS)
	{
		goto err;
	}
	result = Tspi_Context_GetTpmObject (hContext, &hTPM);
	if (result != TSS_SUCCESS)
	{
		goto err;
	}

	pcr_value = chunk_alloc(PTS_PCR_LEN);
	result = Tspi_TPM_PcrExtend(hTPM, pcr_num, PTS_PCR_LEN, input.ptr,
								NULL, &pcr_length, &pcr_value.ptr);
	if (result != TSS_SUCCESS)
	{
		goto err;
	}

	*output = pcr_value;
	*output = chunk_clone(*output);

	DBG3(DBG_PTS, "PCR %d extended with:      %B", pcr_num, &input);
	DBG3(DBG_PTS, "PCR %d value after extend: %B", pcr_num, output);

	chunk_clear(&pcr_value);
	Tspi_Context_FreeMemory(hContext, NULL);
	Tspi_Context_Close(hContext);

	return TRUE;

err:
	DBG1(DBG_PTS, "TPM not available: tss error 0x%x", result);

	chunk_clear(&pcr_value);
	Tspi_Context_FreeMemory(hContext, NULL);
	Tspi_Context_Close(hContext);

	return FALSE;
}

METHOD(pts_t, quote_tpm, bool,
	private_pts_t *this, bool use_quote2, chunk_t *pcr_comp, chunk_t *quote_sig)
{
	TSS_HCONTEXT hContext;
	TSS_HTPM hTPM;
	TSS_HKEY hAIK;
	TSS_HKEY hSRK;
	TSS_HPOLICY srkUsagePolicy;
	TSS_UUID SRK_UUID = TSS_UUID_SRK;
	BYTE secret[] = TSS_WELL_KNOWN_SECRET;
	TSS_HPCRS hPcrComposite;
	TSS_VALIDATION valData;
	TSS_RESULT result;
	chunk_t quote_info;
	BYTE* versionInfo;
	u_int32_t versionInfoSize, pcr;
	enumerator_t *enumerator;
	bool success = FALSE;

	result = Tspi_Context_Create(&hContext);
	if (result != TSS_SUCCESS)
	{
		DBG1(DBG_PTS, "TPM context could not be created: tss error 0x%x",
			 result);
		return FALSE;
	}
	result = Tspi_Context_Connect(hContext, NULL);
	if (result != TSS_SUCCESS)
	{
		goto err1;
	}
	result = Tspi_Context_GetTpmObject (hContext, &hTPM);
	if (result != TSS_SUCCESS)
	{
		goto err1;
	}

	/* Retrieve SRK from TPM and set the authentication to well known secret*/
	result = Tspi_Context_LoadKeyByUUID(hContext, TSS_PS_TYPE_SYSTEM,
									SRK_UUID, &hSRK);
	if (result != TSS_SUCCESS)
	{
		goto err1;
	}

	result = Tspi_GetPolicyObject(hSRK, TSS_POLICY_USAGE, &srkUsagePolicy);
	if (result != TSS_SUCCESS)
	{
		goto err1;
	}
	result = Tspi_Policy_SetSecret(srkUsagePolicy, TSS_SECRET_MODE_SHA1,
					20, secret);
	if (result != TSS_SUCCESS)
	{
		goto err1;
	}

	result = Tspi_Context_LoadKeyByBlob (hContext, hSRK, this->aik_blob.len,
										 this->aik_blob.ptr, &hAIK);
	if (result != TSS_SUCCESS)
	{
		goto err1;
	}

	/* Create PCR composite object */
	result = use_quote2 ?
			Tspi_Context_CreateObject(hContext, TSS_OBJECT_TYPE_PCRS,
							TSS_PCRS_STRUCT_INFO_SHORT, &hPcrComposite) :
			Tspi_Context_CreateObject(hContext, TSS_OBJECT_TYPE_PCRS,
							TSS_PCRS_STRUCT_DEFAULT, &hPcrComposite);
	if (result != TSS_SUCCESS)
	{
		goto err2;
	}

	/* Select PCRs */
	enumerator = this->pcrs->create_enumerator(this->pcrs);
	while (enumerator->enumerate(enumerator, &pcr))
	{
		result = use_quote2 ?
				Tspi_PcrComposite_SelectPcrIndexEx(hPcrComposite, pcr,
											TSS_PCRS_DIRECTION_RELEASE) :
				Tspi_PcrComposite_SelectPcrIndex(hPcrComposite, pcr);
		if (result != TSS_SUCCESS)
		{
			break;
		}
	}
	enumerator->destroy(enumerator);

	if (result != TSS_SUCCESS)
	{
		goto err3;
	}

	/* Set the Validation Data */
	valData.ulExternalDataLength = this->secret.len;
	valData.rgbExternalData = (BYTE *)this->secret.ptr;


	/* TPM Quote */
	result = use_quote2 ?
			Tspi_TPM_Quote2(hTPM, hAIK, FALSE, hPcrComposite, &valData,
							&versionInfoSize, &versionInfo):
			Tspi_TPM_Quote(hTPM, hAIK, hPcrComposite, &valData);
	if (result != TSS_SUCCESS)
	{
		goto err4;
	}

	/* Set output chunks */
	*pcr_comp = chunk_alloc(HASH_SIZE_SHA1);

	if (use_quote2)
	{
		/* TPM_Composite_Hash is last 20 bytes of TPM_Quote_Info2 structure */
		memcpy(pcr_comp->ptr, valData.rgbData + valData.ulDataLength - HASH_SIZE_SHA1,
			   HASH_SIZE_SHA1);
	}
	else
	{
		/* TPM_Composite_Hash is 8-28th bytes of TPM_Quote_Info structure */
		memcpy(pcr_comp->ptr, valData.rgbData + 8, HASH_SIZE_SHA1);
	}
	DBG3(DBG_PTS, "Hash of PCR Composite: %#B", pcr_comp);

	quote_info = chunk_create(valData.rgbData, valData.ulDataLength);
	DBG3(DBG_PTS, "TPM Quote Info: %B",&quote_info);

	*quote_sig = chunk_clone(chunk_create(valData.rgbValidationData,
							  			   valData.ulValidationDataLength));
	DBG3(DBG_PTS, "TPM Quote Signature: %B",quote_sig);

	success = TRUE;

	/* Cleanup */
err4:
	Tspi_Context_FreeMemory(hContext, NULL);

err3:
	Tspi_Context_CloseObject(hContext, hPcrComposite);

err2:
	Tspi_Context_CloseObject(hContext, hAIK);

err1:
	Tspi_Context_Close(hContext);
	if (!success)
	{
		DBG1(DBG_PTS, "TPM not available: tss error 0x%x", result);
	}
	return success;
}

#else /* TSS_TROUSERS */

METHOD(pts_t, read_pcr, bool,
	private_pts_t *this, u_int32_t pcr_num, chunk_t *pcr_value)
{
	return FALSE;
}

METHOD(pts_t, extend_pcr, bool,
	private_pts_t *this, u_int32_t pcr_num, chunk_t input, chunk_t *output)
{
	return FALSE;
}

METHOD(pts_t, quote_tpm, bool,
	private_pts_t *this, bool use_quote2, chunk_t *pcr_comp, chunk_t *quote_sig)
{
	return FALSE;
}

#endif /* TSS_TROUSERS */

/**
 * TPM_QUOTE_INFO structure:
 *	4 bytes of version
 *	4 bytes 'Q' 'U' 'O' 'T'
 *	20 byte SHA1 of TCPA_PCR_COMPOSITE
 *	20 byte nonce
 *
 * TPM_QUOTE_INFO2 structure:
 * 2 bytes Tag 0x0036 TPM_Tag_Quote_info2
 * 4 bytes 'Q' 'U' 'T' '2'
 * 20 bytes nonce
 * 26 bytes PCR_INFO_SHORT
 */

METHOD(pts_t, get_quote_info, bool,
	private_pts_t *this, bool use_quote2, bool use_ver_info,
	pts_meas_algorithms_t comp_hash_algo,
	chunk_t *out_pcr_comp, chunk_t *out_quote_info)
{
	chunk_t selection, pcr_comp, hash_pcr_comp;
	bio_writer_t *writer;
	hasher_t *hasher;

	if (!this->pcrs->get_count(this->pcrs))
	{
		DBG1(DBG_PTS, "No extended PCR entries available, "
					  "unable to construct TPM Quote Info");
		return FALSE;
	}
	if (!this->secret.ptr)
	{
		DBG1(DBG_PTS, "Secret assessment value unavailable, ",
					  "unable to construct TPM Quote Info");
		return FALSE;
	}
	if (use_quote2 && use_ver_info && !this->tpm_version_info.ptr)
	{
		DBG1(DBG_PTS, "TPM Version Information unavailable, ",
					  "unable to construct TPM Quote Info2");
		return FALSE;
	}

	pcr_comp = this->pcrs->get_composite(this->pcrs);


	/* Output the TPM_PCR_COMPOSITE expected from IMC */
	if (comp_hash_algo)
	{
		hash_algorithm_t algo;

		algo = pts_meas_algo_to_hash(comp_hash_algo);
		hasher = lib->crypto->create_hasher(lib->crypto, algo);

		/* Hash the PCR Composite Structure */
		if (!hasher || !hasher->allocate_hash(hasher, pcr_comp, out_pcr_comp))
		{
			DESTROY_IF(hasher);
			free(pcr_comp.ptr);
			return FALSE;
		}
		DBG3(DBG_PTS, "constructed PCR Composite hash: %#B", out_pcr_comp);
		hasher->destroy(hasher);
	}
	else
	{
		*out_pcr_comp = chunk_clone(pcr_comp);
	}

	/* SHA1 hash of PCR Composite to construct TPM_QUOTE_INFO */
	hasher = lib->crypto->create_hasher(lib->crypto, HASH_SHA1);
	if (!hasher || !hasher->allocate_hash(hasher, pcr_comp, &hash_pcr_comp))
	{
		DESTROY_IF(hasher);
		chunk_free(out_pcr_comp);
		free(pcr_comp.ptr);
		return FALSE;
	}
	hasher->destroy(hasher);

	/* Construct TPM_QUOTE_INFO/TPM_QUOTE_INFO2 structure */
	writer = bio_writer_create(TPM_QUOTE_INFO_LEN);

	if (use_quote2)
	{
		/* TPM Structure Tag */
		writer->write_uint16(writer, TPM_TAG_QUOTE_INFO2);

		/* Magic QUT2 value */
		writer->write_data(writer, chunk_create("QUT2", 4));

		/* Secret assessment value 20 bytes (nonce) */
		writer->write_data(writer, this->secret);

		/* PCR selection */
		selection.ptr = pcr_comp.ptr;
		selection.len = 2 + this->pcrs->get_selection_size(this->pcrs);
		writer->write_data(writer, selection);

		/* TPM Locality Selection */
		writer->write_uint8(writer, TPM_LOC_ZERO);

		/* PCR Composite Hash */
		writer->write_data(writer, hash_pcr_comp);

		if (use_ver_info)
		{
			/* TPM version Info */
			writer->write_data(writer, this->tpm_version_info);
		}
	}
	else
	{
		/* Version number */
		writer->write_data(writer, chunk_from_chars(1, 1, 0, 0));

		/* Magic QUOT value */
		writer->write_data(writer, chunk_create("QUOT", 4));

		/* PCR Composite Hash */
		writer->write_data(writer, hash_pcr_comp);

		/* Secret assessment value 20 bytes (nonce) */
		writer->write_data(writer, this->secret);
	}

	/* TPM Quote Info */
	*out_quote_info = writer->extract_buf(writer);
	DBG3(DBG_PTS, "constructed TPM Quote Info: %B", out_quote_info);

	writer->destroy(writer);
	free(pcr_comp.ptr);
	free(hash_pcr_comp.ptr);

	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");
		DESTROY_IF(aik_pub_key);
		return FALSE;
	}

	aik_pub_key->destroy(aik_pub_key);
	return TRUE;
}

METHOD(pts_t, get_pcrs, pts_pcr_t*,
	private_pts_t *this)
{
	return this->pcrs;
}

METHOD(pts_t, destroy, void,
	private_pts_t *this)
{
	DESTROY_IF(this->pcrs);
	DESTROY_IF(this->aik);
	DESTROY_IF(this->dh);
	free(this->initiator_nonce.ptr);
	free(this->responder_nonce.ptr);
	free(this->secret.ptr);
	free(this->aik_blob.ptr);
	free(this->tpm_version_info.ptr);
	free(this);
}


#ifdef TSS_TROUSERS

/**
 * Check for a TPM by querying for TPM Version Info
 */
static bool has_tpm(private_pts_t *this)
{
	TSS_HCONTEXT hContext;
	TSS_HTPM hTPM;
	TSS_RESULT result;
	u_int32_t version_info_len;

	result = Tspi_Context_Create(&hContext);
	if (result != TSS_SUCCESS)
	{
		DBG1(DBG_PTS, "TPM context could not be created: tss error 0x%x",
			 result);
		return FALSE;
	}
	result = Tspi_Context_Connect(hContext, NULL);
	if (result != TSS_SUCCESS)
	{
		goto err;
	}
	result = Tspi_Context_GetTpmObject (hContext, &hTPM);
	if (result != TSS_SUCCESS)
	{
		goto err;
	}
	result = Tspi_TPM_GetCapability(hTPM, TSS_TPMCAP_VERSION_VAL,  0, NULL,
									&version_info_len,
									&this->tpm_version_info.ptr);
	this->tpm_version_info.len = version_info_len;
	if (result != TSS_SUCCESS)
	{
		goto err;
	}
	this->tpm_version_info = chunk_clone(this->tpm_version_info);

	Tspi_Context_FreeMemory(hContext, NULL);
	Tspi_Context_Close(hContext);
	return TRUE;

	err:
	DBG1(DBG_PTS, "TPM not available: tss error 0x%x", result);
	Tspi_Context_FreeMemory(hContext, NULL);
	Tspi_Context_Close(hContext);
	return FALSE;
}

#else /* TSS_TROUSERS */

static bool has_tpm(private_pts_t *this)
{
	return FALSE;
}

#endif /* TSS_TROUSERS */


/**
 * See header
 */
pts_t *pts_create(bool is_imc)
{
	private_pts_t *this;
	pts_pcr_t *pcrs;

	pcrs = pts_pcr_create();
	if (!pcrs)
	{
		DBG1(DBG_PTS, "shadow PCR set could not be created");
		return NULL;
	}

	INIT(this,
		.public = {
			.get_proto_caps = _get_proto_caps,
			.set_proto_caps = _set_proto_caps,
			.get_meas_algorithm = _get_meas_algorithm,
			.set_meas_algorithm = _set_meas_algorithm,
			.get_dh_hash_algorithm = _get_dh_hash_algorithm,
			.set_dh_hash_algorithm = _set_dh_hash_algorithm,
			.create_dh_nonce = _create_dh_nonce,
			.get_my_public_value = _get_my_public_value,
			.set_peer_public_value = _set_peer_public_value,
			.calculate_secret = _calculate_secret,
			.get_platform_id = _get_platform_id,
			.set_platform_id = _set_platform_id,
			.get_tpm_version_info = _get_tpm_version_info,
			.set_tpm_version_info = _set_tpm_version_info,
			.get_aik = _get_aik,
			.set_aik = _set_aik,
			.get_aik_id = _get_aik_id,
			.is_path_valid = _is_path_valid,
			.get_metadata = _get_metadata,
			.read_pcr = _read_pcr,
			.extend_pcr = _extend_pcr,
			.quote_tpm = _quote_tpm,
			.get_pcrs = _get_pcrs,
			.get_quote_info = _get_quote_info,
			.verify_quote_signature  = _verify_quote_signature,
			.destroy = _destroy,
		},
		.is_imc = is_imc,
		.proto_caps = PTS_PROTO_CAPS_V,
		.algorithm = PTS_MEAS_ALGO_SHA256,
		.dh_hash_algorithm = PTS_MEAS_ALGO_SHA256,
		.pcrs = pcrs,
	);

	if (is_imc)
	{
		if (has_tpm(this))
		{
			this->has_tpm = TRUE;
			this->proto_caps |= PTS_PROTO_CAPS_T | PTS_PROTO_CAPS_D;
			load_aik(this);
			load_aik_blob(this);
		}
	}
	else
	{
		this->proto_caps |= PTS_PROTO_CAPS_T | PTS_PROTO_CAPS_D;
	}

	return &this->public;
}