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|
/*
* Licensed Materials - Property of IBM
*
* trousers - An open source TCG Software Stack
*
* (C) Copyright International Business Machines Corp. 2004-2007
*
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <errno.h>
#include <assert.h>
#include "trousers/tss.h"
#include "trousers/trousers.h"
#include "trousers_types.h"
#include "tcs_tsp.h"
#include "spi_utils.h"
#include "capabilities.h"
#include "tsplog.h"
#include "obj.h"
#include "authsess.h"
TSS_RESULT
secret_PerformAuth_OIAP(TSS_HOBJECT hAuthorizedObject,
UINT32 ulPendingFn,
TSS_HPOLICY hPolicy,
TSS_BOOL cas, /* continue auth session */
TCPA_DIGEST *hashDigest,
TPM_AUTH *auth)
{
TSS_RESULT result;
TSS_BOOL bExpired;
UINT32 mode;
TCPA_SECRET secret;
TSS_HCONTEXT tspContext;
TSS_RESULT (*OIAP)(TSS_HCONTEXT, TCS_AUTHHANDLE *, TPM_NONCE *); // XXX hack
TSS_RESULT (*TerminateHandle)(TSS_HCONTEXT, TCS_HANDLE); // XXX hack
/* This validates that the secret can be used */
if ((result = obj_policy_has_expired(hPolicy, &bExpired)))
return result;
if (bExpired == TRUE)
return TSPERR(TSS_E_INVALID_OBJ_ACCESS);
if ((result = obj_policy_get_tsp_context(hPolicy, &tspContext)))
return result;
if ((result = obj_policy_get_mode(hPolicy, &mode)))
return result;
if ((result = Init_AuthNonce(tspContext, cas, auth)))
return result;
/* XXX hack for opening a transport session */
if (cas) {
OIAP = RPC_OIAP;
TerminateHandle = RPC_TerminateHandle;
} else {
OIAP = TCS_API(tspContext)->OIAP;
TerminateHandle = TCS_API(tspContext)->TerminateHandle;
}
/* added retry logic */
if ((result = OIAP(tspContext, &auth->AuthHandle, &auth->NonceEven))) {
if (result == TCPA_E_RESOURCES) {
int retry = 0;
do {
/* POSIX sleep time, { secs, nanosecs } */
struct timespec t = { 0, AUTH_RETRY_NANOSECS };
nanosleep(&t, NULL);
result = OIAP(tspContext, &auth->AuthHandle, &auth->NonceEven);
} while (result == TCPA_E_RESOURCES && ++retry < AUTH_RETRY_COUNT);
}
if (result)
return result;
}
switch (mode) {
case TSS_SECRET_MODE_CALLBACK:
result = obj_policy_do_hmac(hPolicy, hAuthorizedObject,
TRUE, ulPendingFn,
auth->fContinueAuthSession,
20,
auth->NonceEven.nonce,
auth->NonceOdd.nonce,
NULL, NULL, 20,
hashDigest->digest,
(BYTE *)&auth->HMAC);
break;
case TSS_SECRET_MODE_SHA1:
case TSS_SECRET_MODE_PLAIN:
case TSS_SECRET_MODE_POPUP:
if ((result = obj_policy_get_secret(hPolicy, TR_SECRET_CTX_NOT_NEW,
&secret)))
break;
HMAC_Auth(secret.authdata, hashDigest->digest, auth);
break;
case TSS_SECRET_MODE_NONE:
/* fall through */
default:
result = TSPERR(TSS_E_POLICY_NO_SECRET);
break;
}
if (result) {
TerminateHandle(tspContext, auth->AuthHandle);
return result;
}
return obj_policy_dec_counter(hPolicy);
}
#if 0
TSS_RESULT
secret_PerformXOR_OSAP(TSS_HPOLICY hPolicy, TSS_HPOLICY hUsagePolicy,
TSS_HPOLICY hMigrationPolicy, TSS_HOBJECT hOSAPObject,
UINT16 osapType, UINT32 osapData,
TCPA_ENCAUTH * encAuthUsage, TCPA_ENCAUTH * encAuthMig,
BYTE *sharedSecret, TPM_AUTH * auth, TCPA_NONCE * nonceEvenOSAP)
{
TSS_BOOL bExpired;
TCPA_SECRET keySecret;
TCPA_SECRET usageSecret;
TCPA_SECRET migSecret = { { 0, } };
UINT32 keyMode, usageMode, migMode = 0;
TSS_RESULT result;
TSS_HCONTEXT tspContext;
if ((result = obj_policy_has_expired(hPolicy, &bExpired)))
return result;
if (bExpired == TRUE)
return TSPERR(TSS_E_INVALID_OBJ_ACCESS);
if ((result = obj_policy_has_expired(hUsagePolicy, &bExpired)))
return result;
if (bExpired == TRUE)
return TSPERR(TSS_E_INVALID_OBJ_ACCESS);
if (hMigrationPolicy) {
if ((result = obj_policy_has_expired(hMigrationPolicy, &bExpired)))
return result;
if (bExpired == TRUE)
return TSPERR(TSS_E_INVALID_OBJ_ACCESS);
if ((result = obj_policy_get_mode(hMigrationPolicy, &migMode)))
return result;
}
if ((result = obj_policy_get_tsp_context(hPolicy, &tspContext)))
return result;
if ((result = obj_policy_get_mode(hPolicy, &keyMode)))
return result;
if ((result = obj_policy_get_mode(hUsagePolicy, &usageMode)))
return result;
if (keyMode == TSS_SECRET_MODE_CALLBACK ||
usageMode == TSS_SECRET_MODE_CALLBACK ||
(hMigrationPolicy && migMode == TSS_SECRET_MODE_CALLBACK)) {
if (keyMode != TSS_SECRET_MODE_CALLBACK ||
usageMode != TSS_SECRET_MODE_CALLBACK ||
(hMigrationPolicy && migMode != TSS_SECRET_MODE_CALLBACK))
return TSPERR(TSS_E_BAD_PARAMETER);
}
if (keyMode != TSS_SECRET_MODE_CALLBACK) {
if ((result = obj_policy_get_secret(hPolicy, TR_SECRET_CTX_NOT_NEW, &keySecret)))
return result;
if ((result = obj_policy_get_secret(hUsagePolicy, TR_SECRET_CTX_NEW, &usageSecret)))
return result;
if (hMigrationPolicy) {
if ((result = obj_policy_get_secret(hMigrationPolicy, TR_SECRET_CTX_NEW,
&migSecret)))
return result;
}
if ((result = OSAP_Calc(tspContext, osapType, osapData,
keySecret.authdata, usageSecret.authdata,
migSecret.authdata, encAuthUsage,
encAuthMig, sharedSecret, auth)))
return result;
} else {
/* If the secret mode is NONE here, we don't return an error. This is
* because there are commands such as CreateKey, which require an auth
* session even when creating no-auth keys. A secret of all 0's will be
* used in this case. */
if ((result = TCS_API(tspContext)->OSAP(tspContext, osapType, osapData,
&auth->NonceOdd, &auth->AuthHandle,
&auth->NonceEven, nonceEvenOSAP)))
return result;
if ((result = obj_policy_do_xor(hPolicy, hOSAPObject,
hPolicy, TRUE, 20,
auth->NonceEven.nonce, NULL,
nonceEvenOSAP->nonce,
auth->NonceOdd.nonce, 20,
encAuthUsage->authdata,
encAuthMig->authdata))) {
TCS_API(tspContext)->TerminateHandle(tspContext, auth->AuthHandle);
return result;
}
}
return TSS_SUCCESS;
}
TSS_RESULT
secret_PerformAuth_OSAP(TSS_HOBJECT hAuthorizedObject, UINT32 ulPendingFn,
TSS_HPOLICY hPolicy, TSS_HPOLICY hUsagePolicy,
TSS_HPOLICY hMigPolicy, BYTE sharedSecret[20],
TPM_AUTH *auth, BYTE *hashDigest,
TCPA_NONCE *nonceEvenOSAP)
{
TSS_RESULT result;
UINT32 keyMode, usageMode, migMode = 0;
if ((result = obj_policy_get_mode(hPolicy, &keyMode)))
return result;
if ((result = obj_policy_get_mode(hUsagePolicy, &usageMode)))
return result;
if (hMigPolicy) {
if ((result = obj_policy_get_mode(hMigPolicy, &migMode)))
return result;
}
/* --- If any of them is a callback */
if (keyMode == TSS_SECRET_MODE_CALLBACK ||
usageMode == TSS_SECRET_MODE_CALLBACK ||
(hMigPolicy && migMode == TSS_SECRET_MODE_CALLBACK)) {
/* --- And they're not all callback */
if (keyMode != TSS_SECRET_MODE_CALLBACK ||
usageMode != TSS_SECRET_MODE_CALLBACK ||
(hMigPolicy && migMode != TSS_SECRET_MODE_CALLBACK))
return TSPERR(TSS_E_BAD_PARAMETER);
}
if (keyMode == TSS_SECRET_MODE_CALLBACK) {
if ((result = obj_policy_do_hmac(hPolicy, hAuthorizedObject,
TRUE, ulPendingFn,
auth->fContinueAuthSession,
20,
auth->NonceEven.nonce,
NULL,
nonceEvenOSAP->nonce,
auth->NonceOdd.nonce, 20,
hashDigest,
(BYTE *)&auth->HMAC)))
return result;
} else {
HMAC_Auth(sharedSecret, hashDigest, auth);
}
if ((result = obj_policy_dec_counter(hPolicy)))
return result;
if ((result = obj_policy_dec_counter(hUsagePolicy)))
return result;
if (hMigPolicy) {
if ((result = obj_policy_dec_counter(hMigPolicy)))
return result;
}
return TSS_SUCCESS;
}
TSS_RESULT
secret_ValidateAuth_OSAP(TSS_HOBJECT hAuthorizedObject, UINT32 ulPendingFn,
TSS_HPOLICY hPolicy, TSS_HPOLICY hUsagePolicy,
TSS_HPOLICY hMigPolicy, BYTE sharedSecret[20],
TPM_AUTH *auth, BYTE *hashDigest,
TCPA_NONCE *nonceEvenOSAP)
{
TSS_RESULT result;
UINT32 keyMode, usageMode, migMode = 0;
if ((result = obj_policy_get_mode(hPolicy, &keyMode)))
return result;
if ((result = obj_policy_get_mode(hUsagePolicy, &usageMode)))
return result;
if (hMigPolicy) {
if ((result = obj_policy_get_mode(hMigPolicy, &migMode)))
return result;
}
/* --- If any of them is a callback */
if (keyMode == TSS_SECRET_MODE_CALLBACK ||
usageMode == TSS_SECRET_MODE_CALLBACK ||
(hMigPolicy && migMode == TSS_SECRET_MODE_CALLBACK)) {
/* --- And they're not all callback */
if (keyMode != TSS_SECRET_MODE_CALLBACK ||
usageMode != TSS_SECRET_MODE_CALLBACK ||
(hMigPolicy && migMode != TSS_SECRET_MODE_CALLBACK))
return TSPERR(TSS_E_BAD_PARAMETER);
}
if (keyMode != TSS_SECRET_MODE_CALLBACK) {
if (validateReturnAuth(sharedSecret, hashDigest, auth))
return TSPERR(TSS_E_TSP_AUTHFAIL);
} else {
if ((result = obj_policy_do_hmac(hPolicy, hAuthorizedObject,
FALSE, ulPendingFn,
auth->fContinueAuthSession,
20,
auth->NonceEven.nonce,
NULL,
nonceEvenOSAP->nonce,
auth->NonceOdd.nonce, 20,
hashDigest,
(BYTE *)&auth->HMAC)))
return result;
}
return TSS_SUCCESS;
}
#endif
TSS_RESULT
Init_AuthNonce(TSS_HCONTEXT tspContext, TSS_BOOL cas, TPM_AUTH * auth)
{
TSS_RESULT result;
auth->fContinueAuthSession = cas;
if ((result = get_local_random(tspContext, FALSE, sizeof(TPM_NONCE),
(BYTE **)auth->NonceOdd.nonce))) {
LogError("Failed creating random nonce");
return TSPERR(TSS_E_INTERNAL_ERROR);
}
return TSS_SUCCESS;
}
TSS_BOOL
validateReturnAuth(BYTE *secret, BYTE *hash, TPM_AUTH *auth)
{
BYTE digest[20];
/* auth is expected to have both nonces and the digest from the TPM */
memcpy(digest, &auth->HMAC, 20);
HMAC_Auth(secret, hash, auth);
return ((TSS_BOOL) memcmp(digest, &auth->HMAC, 20) != 0);
}
void
HMAC_Auth(BYTE * secret, BYTE * Digest, TPM_AUTH * auth)
{
UINT64 offset;
BYTE Blob[61];
offset = 0;
Trspi_LoadBlob(&offset, 20, Blob, Digest);
Trspi_LoadBlob(&offset, 20, Blob, auth->NonceEven.nonce);
Trspi_LoadBlob(&offset, 20, Blob, auth->NonceOdd.nonce);
Blob[offset++] = auth->fContinueAuthSession;
Trspi_HMAC(TSS_HASH_SHA1, 20, secret, offset, Blob, (BYTE *)&auth->HMAC);
}
TSS_RESULT
OSAP_Calc(TSS_HCONTEXT tspContext, UINT16 EntityType, UINT32 EntityValue,
BYTE * authSecret, BYTE * usageSecret, BYTE * migSecret,
TCPA_ENCAUTH * encAuthUsage, TCPA_ENCAUTH * encAuthMig,
BYTE * sharedSecret, TPM_AUTH * auth)
{
TSS_RESULT rc;
TCPA_NONCE nonceEvenOSAP;
UINT64 offset;
BYTE hmacBlob[0x200];
BYTE hashBlob[0x200];
BYTE xorUsageAuth[20];
BYTE xorMigAuth[20];
UINT32 i;
if ((rc = get_local_random(tspContext, FALSE, sizeof(TPM_NONCE),
(BYTE **)auth->NonceOdd.nonce))) {
LogError("Failed creating random nonce");
return TSPERR(TSS_E_INTERNAL_ERROR);
}
auth->fContinueAuthSession = 0x00;
if ((rc = TCS_API(tspContext)->OSAP(tspContext, EntityType, EntityValue, &auth->NonceOdd,
&auth->AuthHandle, &auth->NonceEven, &nonceEvenOSAP))) {
if (rc == TCPA_E_RESOURCES) {
int retry = 0;
do {
/* POSIX sleep time, { secs, nanosecs } */
struct timespec t = { 0, AUTH_RETRY_NANOSECS };
nanosleep(&t, NULL);
rc = TCS_API(tspContext)->OSAP(tspContext, EntityType, EntityValue,
&auth->NonceOdd, &auth->AuthHandle,
&auth->NonceEven, &nonceEvenOSAP);
} while (rc == TCPA_E_RESOURCES && ++retry < AUTH_RETRY_COUNT);
}
if (rc)
return rc;
}
offset = 0;
Trspi_LoadBlob(&offset, 20, hmacBlob, nonceEvenOSAP.nonce);
Trspi_LoadBlob(&offset, 20, hmacBlob, auth->NonceOdd.nonce);
Trspi_HMAC(TSS_HASH_SHA1, 20, authSecret, offset, hmacBlob, sharedSecret);
offset = 0;
Trspi_LoadBlob(&offset, 20, hashBlob, sharedSecret);
Trspi_LoadBlob(&offset, 20, hashBlob, auth->NonceEven.nonce);
if ((rc = Trspi_Hash(TSS_HASH_SHA1, offset, hashBlob, xorUsageAuth)))
return rc;
offset = 0;
Trspi_LoadBlob(&offset, 20, hashBlob, sharedSecret);
Trspi_LoadBlob(&offset, 20, hashBlob, auth->NonceOdd.nonce);
if ((rc = Trspi_Hash(TSS_HASH_SHA1, offset, hashBlob, xorMigAuth)))
return rc;
for (i = 0; i < sizeof(TCPA_ENCAUTH); i++)
encAuthUsage->authdata[i] = usageSecret[i] ^ xorUsageAuth[i];
for (i = 0; i < sizeof(TCPA_ENCAUTH); i++)
encAuthMig->authdata[i] = migSecret[i] ^ xorMigAuth[i];
return TSS_SUCCESS;
}
TSS_RESULT
obj_policy_validate_auth_oiap(TSS_HPOLICY hPolicy, TCPA_DIGEST *hashDigest, TPM_AUTH *auth)
{
TSS_RESULT result = TSS_SUCCESS;
struct tsp_object *obj;
struct tr_policy_obj *policy;
BYTE wellKnown[TCPA_SHA1_160_HASH_LEN] = TSS_WELL_KNOWN_SECRET;
if ((obj = obj_list_get_obj(&policy_list, hPolicy)) == NULL)
return TSPERR(TSS_E_INVALID_HANDLE);
policy = (struct tr_policy_obj *)obj->data;
switch (policy->SecretMode) {
case TSS_SECRET_MODE_CALLBACK:
result = policy->Tspicb_CallbackHMACAuth(
policy->hmacAppData,
hPolicy,
0,
auth->fContinueAuthSession,
FALSE,
20,
auth->NonceEven.nonce,
auth->NonceOdd.nonce,
NULL, NULL, 20,
hashDigest->digest,
(BYTE *)&auth->HMAC);
break;
case TSS_SECRET_MODE_SHA1:
case TSS_SECRET_MODE_PLAIN:
case TSS_SECRET_MODE_POPUP:
if (validateReturnAuth(policy->Secret, hashDigest->digest, auth))
result = TSPERR(TSS_E_TSP_AUTHFAIL);
break;
case TSS_SECRET_MODE_NONE:
if (validateReturnAuth(wellKnown, hashDigest->digest, auth))
result = TSPERR(TSS_E_TSP_AUTHFAIL);
break;
default:
result = TSPERR(TSS_E_POLICY_NO_SECRET);
break;
}
obj_list_put(&policy_list);
return result;
}
#if 0
TSS_RESULT
authsess_oiap_get(TSS_HOBJECT obj, TPM_COMMAND_CODE ord, TPM_DIGEST *digest, TPM_AUTH *auth)
{
TSS_RESULT result = TSS_SUCCESS;
TSS_BOOL bExpired;
UINT32 mode;
TPM_SECRET secret;
TSS_HCONTEXT tspContext;
TSS_RESULT (*OIAP)(TSS_HCONTEXT, TCS_AUTHHANDLE *, TPM_NONCE *); // XXX hack
TSS_RESULT (*TerminateHandle)(TSS_HCONTEXT, TCS_HANDLE); // XXX hack
if (obj_is_tpm(obj))
result = obj_tpm_get_tsp_context(obj, hContext);
else if (obj_is_rsakey(obj))
result = obj_rsakey_get_tsp_context(obj, hContext);
else if (obj_is_encdata(obj))
result = obj_encdata_get_tsp_context(obj, hContext);
else if (obj_is_nvstore(obj))
result = obj_nvstore_get_tsp_context(obj, hContext);
else
result = TSPERR(TSS_E_INVALID_HANDLE);
#if 0
/* This validates that the secret can be used */
if ((result = obj_policy_has_expired(hPolicy, &bExpired)))
return result;
if (bExpired == TRUE)
return TSPERR(TSS_E_INVALID_OBJ_ACCESS);
if ((result = obj_policy_get_tsp_context(hPolicy, &tspContext)))
return result;
if ((result = obj_policy_get_mode(hPolicy, &mode)))
return result;
#else
if ((result = obj_policy_get_authsess_params()))
return result;
#endif
if ((result = Init_AuthNonce(tspContext, cas, auth)))
return result;
/* XXX hack for opening a transport session */
if (cas) {
OIAP = RPC_OIAP;
TerminateHandle = RPC_TerminateHandle;
} else {
OIAP = TCS_API(tspContext)->OIAP;
TerminateHandle = TCS_API(tspContext)->TerminateHandle;
}
/* added retry logic */
if ((result = OIAP(tspContext, &auth->AuthHandle, &auth->NonceEven))) {
if (result == TCPA_E_RESOURCES) {
int retry = 0;
do {
/* POSIX sleep time, { secs, nanosecs } */
struct timespec t = { 0, AUTH_RETRY_NANOSECS };
nanosleep(&t, NULL);
result = OIAP(tspContext, &auth->AuthHandle, &auth->NonceEven);
} while (result == TCPA_E_RESOURCES && ++retry < AUTH_RETRY_COUNT);
}
if (result)
return result;
}
switch (mode) {
case TSS_SECRET_MODE_CALLBACK:
result = obj_policy_do_hmac(hPolicy, hAuthorizedObject,
TRUE, ulPendingFn,
auth->fContinueAuthSession,
20,
auth->NonceEven.nonce,
auth->NonceOdd.nonce,
NULL, NULL, 20,
hashDigest->digest,
(BYTE *)&auth->HMAC);
break;
case TSS_SECRET_MODE_SHA1:
case TSS_SECRET_MODE_PLAIN:
case TSS_SECRET_MODE_POPUP:
if ((result = obj_policy_get_secret(hPolicy, TR_SECRET_CTX_NOT_NEW,
&secret)))
break;
HMAC_Auth(secret.authdata, hashDigest->digest, auth);
break;
case TSS_SECRET_MODE_NONE:
/* fall through */
default:
result = TSPERR(TSS_E_POLICY_NO_SECRET);
break;
}
if (result) {
TerminateHandle(tspContext, auth->AuthHandle);
return result;
}
return obj_policy_dec_counter(hPolicy);
}
TSS_RESULT
authsess_oiap_put(TPM_AUTH *auth)
{
}
#endif
#ifdef TSS_BUILD_DELEGATION
TSS_RESULT
authsess_do_dsap(struct authsess *sess)
{
TSS_RESULT result;
if ((result = TCS_API(sess->tspContext)->DSAP(sess->tspContext, sess->entity_type,
sess->obj_parent, &sess->nonceOddxSAP,
sess->entityValueSize, sess->entityValue,
&sess->pAuth->AuthHandle,
&sess->pAuth->NonceEven,
&sess->nonceEvenxSAP))) {
if (result == TCPA_E_RESOURCES) {
int retry = 0;
do {
/* POSIX sleep time, { secs, nanosecs } */
struct timespec t = { 0, AUTH_RETRY_NANOSECS };
nanosleep(&t, NULL);
result = TCS_API(sess->tspContext)->DSAP(sess->tspContext,
sess->entity_type,
sess->obj_parent,
&sess->nonceOddxSAP,
sess->entityValueSize,
sess->entityValue,
&sess->pAuth->AuthHandle,
&sess->pAuth->NonceEven,
&sess->nonceEvenxSAP);
} while (result == TCPA_E_RESOURCES && ++retry < AUTH_RETRY_COUNT);
}
}
return result;
}
#endif
TSS_RESULT
authsess_do_osap(struct authsess *sess)
{
TSS_RESULT result;
if ((result = TCS_API(sess->tspContext)->OSAP(sess->tspContext, sess->entity_type,
sess->obj_parent, &sess->nonceOddxSAP,
&sess->pAuth->AuthHandle,
&sess->pAuth->NonceEven,
&sess->nonceEvenxSAP))) {
if (result == TCPA_E_RESOURCES) {
int retry = 0;
do {
/* POSIX sleep time, { secs, nanosecs } */
struct timespec t = { 0, AUTH_RETRY_NANOSECS };
nanosleep(&t, NULL);
result = TCS_API(sess->tspContext)->OSAP(sess->tspContext,
sess->entity_type,
sess->obj_parent,
&sess->nonceOddxSAP,
&sess->pAuth->AuthHandle,
&sess->pAuth->NonceEven,
&sess->nonceEvenxSAP);
} while (result == TCPA_E_RESOURCES && ++retry < AUTH_RETRY_COUNT);
}
}
return result;
}
TSS_RESULT
authsess_callback_xor(PVOID lpAppData,
TSS_HOBJECT hOSAPObject,
TSS_HOBJECT hObject,
TSS_FLAG PurposeSecret,
UINT32 ulSizeNonces,
BYTE *rgbNonceEven,
BYTE *rgbNonceOdd,
BYTE *rgbNonceEvenOSAP,
BYTE *rgbNonceOddOSAP,
UINT32 ulSizeEncAuth,
BYTE *rgbEncAuthUsage,
BYTE *rgbEncAuthMigration)
{
TSS_RESULT result;
BYTE xorUseAuth[sizeof(TPM_DIGEST)];
BYTE xorMigAuth[sizeof(TPM_DIGEST)];
Trspi_HashCtx hashCtx;
UINT32 i;
struct authsess *sess = (struct authsess *)lpAppData;
/* sess->sharedSecret was calculated in authsess_xsap_init */
result = Trspi_HashInit(&hashCtx, TSS_HASH_SHA1);
result |= Trspi_Hash_SECRET(&hashCtx, sess->sharedSecret.digest);
result |= Trspi_Hash_NONCE(&hashCtx, rgbNonceEven);
if ((result |= Trspi_HashFinal(&hashCtx, xorUseAuth)))
return result;
for (i = 0; i < ulSizeEncAuth; i++)
rgbEncAuthUsage[i] ^= xorUseAuth[i];
result = Trspi_HashInit(&hashCtx, TSS_HASH_SHA1);
result |= Trspi_Hash_SECRET(&hashCtx, sess->sharedSecret.digest);
result |= Trspi_Hash_NONCE(&hashCtx, rgbNonceOdd);
if ((result |= Trspi_HashFinal(&hashCtx, xorMigAuth)))
return result;
for (i = 0; i < ulSizeEncAuth; i++)
rgbEncAuthMigration[i] ^= xorMigAuth[i];
return TSS_SUCCESS;
}
TSS_RESULT
authsess_callback_hmac(PVOID lpAppData,
TSS_HOBJECT hAuthorizedObject,
TSS_BOOL ReturnOrVerify,
UINT32 ulPendingFunction,
TSS_BOOL ContinueUse,
UINT32 ulSizeNonces,
BYTE *rgbNonceEven,
BYTE *rgbNonceOdd,
BYTE *rgbNonceEvenOSAP,
BYTE *rgbNonceOddOSAP,
UINT32 ulSizeDigestHmac,
BYTE *rgbParamDigest,
BYTE *rgbHmacData)
{
struct authsess *sess = (struct authsess *)lpAppData;
TSS_RESULT result = TSS_SUCCESS;
UINT64 offset;
BYTE Blob[61];
offset = 0;
Trspi_LoadBlob(&offset, ulSizeDigestHmac, Blob, rgbParamDigest);
Trspi_LoadBlob(&offset, ulSizeNonces, Blob, rgbNonceEven);
Trspi_LoadBlob(&offset, ulSizeNonces, Blob, rgbNonceOdd);
Blob[offset++] = ContinueUse;
if (ReturnOrVerify) {
Trspi_HMAC(TSS_HASH_SHA1, ulSizeDigestHmac, sess->sharedSecret.digest, offset, Blob,
rgbHmacData);
} else {
TPM_HMAC hmacVerify;
Trspi_HMAC(TSS_HASH_SHA1, ulSizeDigestHmac, sess->sharedSecret.digest, offset, Blob,
hmacVerify.digest);
result = memcmp(rgbHmacData, hmacVerify.digest, ulSizeDigestHmac);
if (result)
result = TPM_E_AUTHFAIL;
}
return result;
}
/* Create an OSAP session. @requirements is used in different ways depending on the command to
* indicate whether we should require a policy or auth value */
TSS_RESULT
authsess_xsap_init(TSS_HCONTEXT tspContext,
TSS_HOBJECT obj_parent,
TSS_HOBJECT obj_child,
TSS_BOOL requirements,
TPM_COMMAND_CODE command,
TPM_ENTITY_TYPE entity_type,
struct authsess **xsess)
{
TSS_RESULT result;
TSS_BOOL authdatausage = FALSE, req_auth = TRUE, get_child_auth = TRUE, secret_set = FALSE;
BYTE hmacBlob[2 * sizeof(TPM_DIGEST)];
UINT64 offset;
TSS_BOOL new_secret = TR_SECRET_CTX_NOT_NEW;
struct authsess *sess;
if ((sess = calloc(1, sizeof(struct authsess))) == NULL) {
LogError("malloc of %zd bytes failed", sizeof(struct authsess));
return TSPERR(TSS_E_OUTOFMEMORY);
}
switch (command) {
/* Parent is Key for the cases below */
case TPM_ORD_Delegate_CreateKeyDelegation:
case TPM_ORD_CreateWrapKey:
case TPM_ORD_CMK_CreateKey:
case TPM_ORD_Seal:
case TPM_ORD_Sealx:
case TPM_ORD_Unseal:
case TPM_ORD_ChangeAuth:
if ((result = obj_rsakey_get_policy(obj_parent, TSS_POLICY_USAGE,
&sess->hUsageParent, NULL)))
goto error;
break;
/* Parent is TPM for the cases below */
case TPM_ORD_Delegate_CreateOwnerDelegation:
req_auth = FALSE;
/* fall through */
case TPM_ORD_MakeIdentity:
case TPM_ORD_NV_DefineSpace:
if ((result = obj_tpm_get_policy(obj_parent, TSS_POLICY_USAGE,
&sess->hUsageParent)))
goto error;
break;
case TPM_ORD_ChangeAuthOwner:
/* Special case, ChangeAuthOwner is used to change Owner and SRK auth */
if (obj_is_rsakey(obj_parent)) {
if ((result = obj_rsakey_get_policy(obj_parent, TSS_POLICY_USAGE,
&sess->hUsageParent, NULL)))
goto error;
} else {
if ((result = obj_tpm_get_policy(obj_parent, TSS_POLICY_USAGE,
&sess->hUsageParent)))
goto error;
}
break;
default:
result = TSPERR(TSS_E_INTERNAL_ERROR);
goto error;
}
if (requirements && !sess->hUsageParent) {
result = TSPERR(TSS_E_TSP_AUTHREQUIRED);
goto error;
}
if (sess->hUsageParent) {
/* These are trousers callback functions which will be used to process the auth
* session. If the policy type is callback for hUsageParent, they will be
* overwritten by the application defined callback functions in the policy */
sess->cb_xor.callback = authsess_callback_xor;
sess->cb_xor.appData = (PVOID)sess;
sess->cb_hmac.callback = authsess_callback_hmac;
sess->cb_hmac.appData = (PVOID)sess;
/* XXX the parent object doesn't always hold the callbacks */
if ((result = obj_policy_get_xsap_params(sess->hUsageParent, command,
&sess->entity_type, &sess->entityValueSize,
&sess->entityValue,
sess->parentSecret.authdata, &sess->cb_xor,
&sess->cb_hmac, NULL, &sess->parentMode,
new_secret)))
goto error;
} else
sess->parentMode = TSS_SECRET_MODE_NONE;
switch (command) {
/* Child is a Key object */
case TPM_ORD_CreateWrapKey:
case TPM_ORD_CMK_CreateKey:
if ((result = obj_rsakey_get_policies(obj_child, &sess->hUsageChild,
&sess->hMigChild, &authdatausage)))
goto error;
if (authdatausage && !sess->hUsageChild) {
result = TSPERR(TSS_E_TSP_AUTHREQUIRED);
goto error;
}
if (obj_rsakey_is_migratable(obj_child)) {
if (!sess->hMigChild) {
result = TSPERR(TSS_E_KEY_NO_MIGRATION_POLICY);
goto error;
}
if ((result = obj_policy_get_xsap_params(sess->hMigChild, 0, NULL, NULL,
NULL, sess->encAuthMig.authdata,
NULL, NULL, NULL, &sess->mMode,
new_secret)))
goto error;
}
if ((result = obj_rsakey_get_tcs_handle(obj_parent, &sess->obj_parent)))
goto error;
break;
/* Child is an Encdata object */
case TPM_ORD_Unseal:
#ifdef TSS_BUILD_SEALX
case TPM_ORD_Sealx:
/* These may be overwritten down below, when obj_policy_get_xsap_params is called
* on the child usage policy */
sess->cb_sealx.callback = sealx_mask_cb;
sess->cb_sealx.appData = (PVOID)sess;
/* fall through */
#endif
case TPM_ORD_Seal:
if ((result = obj_encdata_get_policy(obj_child, TSS_POLICY_USAGE,
&sess->hUsageChild)))
goto error;
if ((result = obj_rsakey_get_tcs_handle(obj_parent, &sess->obj_parent)))
goto error;
break;
#ifdef TSS_BUILD_NV
/* Child is an NV object */
case TPM_ORD_NV_DefineSpace:
/* The requirements variable tells us whether nv object auth is required */
req_auth = requirements;
if (req_auth) {
if (sess->parentMode == TSS_SECRET_MODE_NONE) {
result = TSPERR(TSS_E_TSP_AUTHREQUIRED);
goto error;
}
if ((result = obj_nvstore_get_policy(obj_child, TSS_POLICY_USAGE,
&sess->hUsageChild)))
goto error;
/* According to the spec, we must fall back on the TSP context's policy for
* auth if none is set in the NV object */
if (!sess->hUsageChild) {
if ((result = obj_context_get_policy(tspContext, TSS_POLICY_USAGE,
&sess->hUsageChild)))
goto error;
}
if ((result = obj_policy_is_secret_set(sess->hUsageChild, &secret_set)))
goto error;
if (!secret_set) {
result = TSPERR(TSS_E_TSP_AUTHREQUIRED);
goto error;
}
} else {
/* In this case, the TPM is owned, but we're creating a no-auth NV area */
get_child_auth = FALSE;
}
break;
#endif
/* Child is a Key object */
case TPM_ORD_MakeIdentity:
if ((result = obj_rsakey_get_policy(obj_child, TSS_POLICY_USAGE,
&sess->hUsageChild, NULL)))
goto error;
break;
/* Child is a Policy object */
case TPM_ORD_Delegate_CreateKeyDelegation:
case TPM_ORD_ChangeAuth:
if ((result = obj_rsakey_get_tcs_handle(obj_parent, &sess->obj_parent)))
goto error;
/* fall through */
case TPM_ORD_Delegate_CreateOwnerDelegation:
case TPM_ORD_ChangeAuthOwner:
sess->hUsageChild = obj_child;
new_secret = TR_SECRET_CTX_NEW;
break;
default:
result = TSPERR(TSS_E_INTERNAL_ERROR);
goto error;
}
/* If req_auth is FALSE here, we don't actually need to set up an auth session, so returning
* is OK. At this point, authsess->pAuth is NULL, so the TCS API will not get any
* authdata. */
if (req_auth == FALSE && sess->parentMode == TSS_SECRET_MODE_NONE)
goto done;
if (get_child_auth) {
if ((result = obj_policy_get_xsap_params(sess->hUsageChild, 0, 0, NULL, NULL,
sess->encAuthUse.authdata, NULL, NULL,
&sess->cb_sealx, &sess->uMode,
new_secret)))
goto error;
}
if ((result = get_local_random(tspContext, FALSE, sizeof(TPM_NONCE),
(BYTE **)sess->nonceOddxSAP.nonce)))
goto error;
sess->obj_child = obj_child;
sess->tspContext = tspContext;
sess->pAuth = &sess->auth;
sess->command = command;
#ifdef TSS_BUILD_DELEGATION
/* if entityValue is set, we have a custom entity, i.e. delegation blob or row */
if (sess->entityValue) {
/* DSAP's entity type was pulled from the policy in the authsess_xsap_init call
* above */
if ((result = authsess_do_dsap(sess)))
goto error;
}
#endif
if (!sess->entityValue) {
sess->entity_type = entity_type;
if ((result = authsess_do_osap(sess)))
goto error;
}
if ((result = get_local_random(tspContext, FALSE, sizeof(TPM_NONCE),
(BYTE **)sess->auth.NonceOdd.nonce)))
goto error;
/* We have both OSAP nonces, so calculate the shared secret if we're responsible for it */
if (sess->parentMode != TSS_SECRET_MODE_CALLBACK) {
offset = 0;
Trspi_LoadBlob(&offset, sizeof(TPM_NONCE), hmacBlob, sess->nonceEvenxSAP.nonce);
Trspi_LoadBlob(&offset, sizeof(TPM_NONCE), hmacBlob, sess->nonceOddxSAP.nonce);
if ((result = Trspi_HMAC(TSS_HASH_SHA1, sizeof(TPM_ENCAUTH),
sess->parentSecret.authdata, offset, hmacBlob,
sess->sharedSecret.digest)))
goto error;
}
/* XXX What does a PurposeSecret of TRUE mean here? */
if ((result =
((TSS_RESULT (*)(PVOID, TSS_HOBJECT, TSS_HOBJECT, TSS_FLAG,
UINT32, BYTE *, BYTE *, BYTE *, BYTE *, UINT32, BYTE *,
BYTE *))sess->cb_xor.callback)(sess->cb_xor.appData, sess->hUsageParent,
sess->hUsageChild, TRUE, sizeof(TPM_DIGEST),
sess->auth.NonceEven.nonce, sess->auth.NonceOdd.nonce,
sess->nonceEvenxSAP.nonce, sess->nonceOddxSAP.nonce,
sizeof(TPM_ENCAUTH), sess->encAuthUse.authdata,
sess->encAuthMig.authdata)))
return result;
done:
*xsess = sess;
return TSS_SUCCESS;
error:
free(sess);
return result;
}
TSS_RESULT
authsess_xsap_hmac(struct authsess *sess, TPM_DIGEST *digest)
{
TSS_RESULT result;
/* If no auth session was established using this authsess object, return success */
if (!sess->pAuth)
return TSS_SUCCESS;
/* XXX Placeholder for future continueAuthSession support:
* conditionally bump NonceOdd if continueAuthSession == TRUE here
*/
if ((result =
((TSS_RESULT (*)(PVOID, TSS_HOBJECT, TSS_BOOL,
UINT32, TSS_BOOL, UINT32, BYTE *, BYTE *,
BYTE *, BYTE *, UINT32, BYTE *,
BYTE *))sess->cb_hmac.callback)(sess->cb_hmac.appData,
sess->hUsageParent, TRUE, sess->command,
sess->auth.fContinueAuthSession, sizeof(TPM_NONCE),
sess->auth.NonceEven.nonce,
sess->auth.NonceOdd.nonce,
sess->nonceEvenxSAP.nonce,
sess->nonceOddxSAP.nonce, sizeof(TPM_DIGEST),
digest->digest, sess->auth.HMAC.authdata)))
return result;
if (sess->hUsageParent)
obj_policy_dec_counter(sess->hUsageParent);
if (sess->hUsageChild)
obj_policy_dec_counter(sess->hUsageChild);
if (sess->hMigChild)
obj_policy_dec_counter(sess->hMigChild);
return TSS_SUCCESS;
}
TSS_RESULT
authsess_xsap_verify(struct authsess *sess, TPM_DIGEST *digest)
{
/* If no auth session was established using this authsess object, return success */
if (!sess->pAuth)
return TSS_SUCCESS;
return ((TSS_RESULT (*)(PVOID, TSS_HOBJECT, TSS_BOOL,
UINT32, TSS_BOOL, UINT32, BYTE *, BYTE *,
BYTE *, BYTE *, UINT32, BYTE *,
BYTE *))sess->cb_hmac.callback)(sess->cb_hmac.appData,
sess->hUsageParent, FALSE, sess->command,
sess->auth.fContinueAuthSession, sizeof(TPM_NONCE),
sess->auth.NonceEven.nonce,
sess->auth.NonceOdd.nonce,
sess->nonceEvenxSAP.nonce,
sess->nonceOddxSAP.nonce, sizeof(TPM_DIGEST),
digest->digest, sess->auth.HMAC.authdata);
}
TSS_RESULT
__tspi_free_resource(TSS_HCONTEXT tspContext, UINT32 handle, UINT32 resourceType)
{
TSS_RESULT result = TSS_SUCCESS;
#ifdef TSS_BUILD_TSS12
UINT32 version = 0;
if ((result = obj_context_get_tpm_version(tspContext, &version)))
return result;
if (version == 2) {
return TCS_API(tspContext)->FlushSpecific(tspContext, handle, resourceType);
}
#endif
switch (resourceType) {
case TPM_RT_KEY:
result = TCS_API(tspContext)->EvictKey(tspContext, handle);
break;
case TPM_RT_AUTH:
result = TCS_API(tspContext)->TerminateHandle(tspContext, handle);
break;
default:
LogDebugFn("Trying to free TPM 1.2 resource type 0x%x on 1.1 TPM!",
resourceType);
result = TSPERR(TSS_E_INTERNAL_ERROR);
break;
}
return result;
}
void
authsess_free(struct authsess *xsap)
{
if (xsap) {
if (xsap->auth.AuthHandle && xsap->auth.fContinueAuthSession)
(void)__tspi_free_resource(xsap->tspContext, xsap->auth.AuthHandle, TPM_RT_AUTH);
free(xsap->entityValue);
free(xsap);
xsap = NULL;
}
}
#ifdef TSS_BUILD_TRANSPORT
TSS_RESULT
Transport_OIAP(TSS_HCONTEXT tspContext, /* in */
TCS_AUTHHANDLE* authHandle, /* out */
TPM_NONCE* nonce0) /* out */
{
TSS_RESULT result;
UINT32 decLen = 0;
BYTE *dec = NULL;
UINT64 offset;
TCS_HANDLE handlesLen = 0;
if ((result = obj_context_transport_init(tspContext)))
return result;
LogDebugFn("Executing in a transport session");
if ((result = obj_context_transport_execute(tspContext, TPM_ORD_OIAP, 0, NULL, NULL,
&handlesLen, NULL, NULL, NULL, &decLen, &dec)))
return result;
if (decLen != sizeof(TCS_AUTHHANDLE) + sizeof(TPM_NONCE))
return TSPERR(TSS_E_INTERNAL_ERROR);
offset = 0;
Trspi_UnloadBlob_UINT32(&offset, authHandle, dec);
Trspi_UnloadBlob_NONCE(&offset, dec, nonce0);
return result;
}
TSS_RESULT
Transport_OSAP(TSS_HCONTEXT tspContext, /* in */
TPM_ENTITY_TYPE entityType, /* in */
UINT32 entityValue, /* in */
TPM_NONCE* nonceOddOSAP, /* in */
TCS_AUTHHANDLE* authHandle, /* out */
TPM_NONCE* nonceEven, /* out */
TPM_NONCE* nonceEvenOSAP) /* out */
{
TSS_RESULT result;
UINT32 decLen = 0;
BYTE *dec = NULL;
UINT64 offset;
TCS_HANDLE handlesLen = 0;
BYTE data[sizeof(UINT16) + sizeof(UINT32) + sizeof(TPM_NONCE)];
if ((result = obj_context_transport_init(tspContext)))
return result;
LogDebugFn("Executing in a transport session");
offset = 0;
Trspi_LoadBlob_UINT16(&offset, entityType, data);
Trspi_LoadBlob_UINT32(&offset, entityValue, data);
Trspi_LoadBlob_NONCE(&offset, data, nonceOddOSAP);
if ((result = obj_context_transport_execute(tspContext, TPM_ORD_OSAP, sizeof(data), data,
NULL, &handlesLen, NULL, NULL, NULL, &decLen,
&dec)))
return result;
offset = 0;
Trspi_UnloadBlob_UINT32(&offset, authHandle, dec);
Trspi_UnloadBlob_NONCE(&offset, dec, nonceEven);
Trspi_UnloadBlob_NONCE(&offset, dec, nonceEvenOSAP);
return TSS_SUCCESS;
}
TSS_RESULT
Transport_TerminateHandle(TSS_HCONTEXT tspContext, /* in */
TCS_AUTHHANDLE handle) /* in */
{
TSS_RESULT result;
TCS_HANDLE handlesLen = 0, *handles;
/* Call ExecuteTransport */
handlesLen = 1;
if ((handles = malloc(sizeof(TCS_HANDLE))) == NULL) {
LogError("malloc of %zd bytes failed", sizeof(TCS_HANDLE));
return TSPERR(TSS_E_OUTOFMEMORY);
}
*handles = handle;
result = obj_context_transport_execute(tspContext, TPM_ORD_Terminate_Handle, 0, NULL,
NULL, &handlesLen, &handles, NULL, NULL, NULL, NULL);
return result;
}
#endif
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