/
gnutls_tpm2_esys.c
666 lines (576 loc) · 18.3 KB
/
gnutls_tpm2_esys.c
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/*
* OpenConnect (SSL + DTLS) VPN client
*
* Copyright © 2018 David Woodhouse.
*
* Author: David Woodhouse <dwmw2@infradead.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* version 2.1, as published by the Free Software Foundation.
*
* 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
* Lesser General Public License for more details.
*/
/* Portions taken from tpm2-tss-engine, copyright as below: */
/*******************************************************************************
* Copyright 2017-2018, Fraunhofer SIT sponsored by Infineon Technologies AG
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. Neither the name of tpm2-tss-engine nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
******************************************************************************/
#include "config.h"
#include "openconnect-internal.h"
#include "gnutls.h"
#ifdef HAVE_TSS2
#include <stdio.h>
#include <string.h>
#include <tss2/tss2_mu.h>
#include <tss2/tss2_esys.h>
struct oc_tpm2_ctx {
TPM2B_PUBLIC pub;
TPM2B_PRIVATE priv;
TPM2B_DIGEST userauth;
TPM2B_DIGEST ownerauth;
unsigned int need_userauth:1;
unsigned int need_ownerauth:1;
};
static TPM2B_PUBLIC primaryTemplate = {
.publicArea = {
.type = TPM2_ALG_ECC,
.nameAlg = TPM2_ALG_SHA256,
.objectAttributes = (TPMA_OBJECT_USERWITHAUTH |
TPMA_OBJECT_RESTRICTED |
TPMA_OBJECT_DECRYPT |
TPMA_OBJECT_NODA |
TPMA_OBJECT_SENSITIVEDATAORIGIN),
.authPolicy = {
.size = 0,
},
.parameters.eccDetail = {
.symmetric = {
.algorithm = TPM2_ALG_AES,
.keyBits.aes = 128,
.mode.aes = TPM2_ALG_CFB,
},
.scheme = {
.scheme = TPM2_ALG_NULL,
.details = {}
},
.curveID = TPM2_ECC_NIST_P256,
.kdf = {
.scheme = TPM2_ALG_NULL,
.details = {}
},
},
.unique.ecc = {
.x.size = 0,
.y.size = 0
}
}
};
static TPM2B_SENSITIVE_CREATE primarySensitive = {
.sensitive = {
.userAuth = {
.size = 0,
},
.data = {
.size = 0,
}
}
};
static TPM2B_DATA allOutsideInfo = {
.size = 0,
};
static TPML_PCR_SELECTION allCreationPCR = {
.count = 0,
};
/** Initialize the ESYS TPM connection and primary key
*
* Establish a connection with the TPM using ESYS libraries and create a primary
* key under the owner hierarchy.
* @param ctx The resulting ESYS context.
* @param primaryHandle The resulting handle for the primary key.
* @retval TSS2_RC_SUCCESS on success
* @retval TSS2_RCs according to the error
*/
static int init_tpm2_primary(struct openconnect_info *vpninfo,
ESYS_CONTEXT **ctx, ESYS_TR *primaryHandle)
{
TSS2_RC r;
*primaryHandle = ESYS_TR_NONE;
vpn_progress(vpninfo, PRG_DEBUG,
_("Establishing connection with TPM.\n"));
r = Esys_Initialize(ctx, NULL, NULL);
if (r) {
vpn_progress(vpninfo, PRG_ERR,
_("TPM2 Esys_Initialize failed: 0x%x\n"),
r);
goto error;
}
r = Esys_Startup(*ctx, TPM2_SU_CLEAR);
if (r == TPM2_RC_INITIALIZE) {
vpn_progress(vpninfo, PRG_DEBUG,
_("TPM2 was already started up thus false positive failing in tpm2tss log.\n"));
} else if (r) {
vpn_progress(vpninfo, PRG_ERR,
_("TPM2 Esys_Startup failed: 0x%x\n"),
r);
goto error;
}
vpn_progress(vpninfo, PRG_DEBUG, _("Creating primary key under owner.\n"));
reauth:
if (vpninfo->tpm2->need_ownerauth) {
char *pass = NULL;
int err = request_passphrase(vpninfo, "openconnect_tpm2_owner",
&pass, _("Enter TPM2 owner password:"));
if (err)
goto error;
if (strlen(pass) > sizeof(vpninfo->tpm2->ownerauth.buffer) - 1) {
vpn_progress(vpninfo, PRG_ERR,
_("TPM2 owner password too long; truncating\n"));
pass[sizeof(vpninfo->tpm2->ownerauth.buffer) - 1] = 0;
}
vpninfo->tpm2->ownerauth.size = strlen(pass);
strcpy((char *)vpninfo->tpm2->ownerauth.buffer, pass);
memset(pass, 0, strlen(pass));
free(pass);
vpninfo->tpm2->need_ownerauth = 0;
}
r = Esys_TR_SetAuth(*ctx, ESYS_TR_RH_OWNER, &vpninfo->tpm2->ownerauth);
if (r) {
vpn_progress(vpninfo, PRG_ERR,
_("TPM2 Esys_TR_SetAuth failed: 0x%x\n"),
r);
goto error;
}
r = Esys_CreatePrimary(*ctx, ESYS_TR_RH_OWNER,
ESYS_TR_PASSWORD, ESYS_TR_NONE, ESYS_TR_NONE,
&primarySensitive, &primaryTemplate,
&allOutsideInfo, &allCreationPCR,
primaryHandle, NULL, NULL, NULL, NULL);
if (r == 0x000009a2) {
vpn_progress(vpninfo, PRG_DEBUG,
_("TPM2 Esys_CreatePrimary owner auth failed\n"));
vpninfo->tpm2->need_ownerauth = 1;
goto reauth;
} else if (r) {
vpn_progress(vpninfo, PRG_ERR,
_("TPM2 Esys_CreatePrimary failed: 0x%x\n"),
r);
goto error;
}
return 0;
error:
if (*primaryHandle != ESYS_TR_NONE)
Esys_FlushContext(*ctx, *primaryHandle);
*primaryHandle = ESYS_TR_NONE;
Esys_Finalize(ctx);
return -EIO;
}
/** Initialize the ESYS TPM connection and load the key
*
* Establish a connection with the TPM using ESYS libraries, create a primary
* key under the owner hierarchy and then load the TPM key and set its auth
* value.
* @param ctx The resulting ESYS context.
* @param keyHandle The resulting handle for the key key.
* @param tpm2Data The key data, owner auth and key auth to be used
* @retval TSS2_RC_SUCCESS on success
* @retval TSS2_RCs according to the error
*/
static int init_tpm2_key(ESYS_CONTEXT **ctx, ESYS_TR *keyHandle,
struct openconnect_info *vpninfo)
{
TSS2_RC r;
ESYS_TR primaryHandle = ESYS_TR_NONE;
*keyHandle = ESYS_TR_NONE;
if (init_tpm2_primary(vpninfo, ctx, &primaryHandle))
goto error;
vpn_progress(vpninfo, PRG_DEBUG, _("Loading TPM2 key blob.\n"));
r = Esys_Load(*ctx, primaryHandle,
ESYS_TR_PASSWORD, ESYS_TR_NONE, ESYS_TR_NONE,
&vpninfo->tpm2->priv, &vpninfo->tpm2->pub,
keyHandle);
if (r) {
vpn_progress(vpninfo, PRG_ERR,
_("TPM2 Esys_Load failed: 0x%x\n"),
r);
goto error;
}
r = Esys_FlushContext(*ctx, primaryHandle);
if (r) {
vpn_progress(vpninfo, PRG_ERR,
_("TPM2 Esys_FlushContext failed: 0x%x\n"),
r);
goto error;
}
primaryHandle = ESYS_TR_NONE;
return 0;
error:
if (primaryHandle != ESYS_TR_NONE)
Esys_FlushContext(*ctx, primaryHandle);
if (*keyHandle != ESYS_TR_NONE)
Esys_FlushContext(*ctx, *keyHandle);
*keyHandle = ESYS_TR_NONE;
Esys_Finalize(ctx);
return -EIO;
}
static int auth_tpm2_key(struct openconnect_info *vpninfo, ESYS_CONTEXT *ctx, ESYS_TR key_handle)
{
TSS2_RC r;
if (vpninfo->tpm2->need_userauth || vpninfo->cert_password) {
char *pass = NULL;
if (vpninfo->cert_password) {
pass = vpninfo->cert_password;
vpninfo->cert_password = NULL;
} else {
int err = request_passphrase(vpninfo, "openconnect_tpm2_key",
&pass, _("Enter TPM2 key password:"));
if (err)
return err;
}
if (strlen(pass) > sizeof(vpninfo->tpm2->userauth.buffer) - 1) {
vpn_progress(vpninfo, PRG_ERR,
_("TPM2 key password too long; truncating\n"));
pass[sizeof(vpninfo->tpm2->userauth.buffer) - 1] = 0;
}
vpninfo->tpm2->userauth.size = strlen(pass);
strcpy((char *)vpninfo->tpm2->userauth.buffer, pass);
memset(pass, 0, strlen(pass));
free(pass);
vpninfo->tpm2->need_userauth = 0;
}
r = Esys_TR_SetAuth(ctx, key_handle, &vpninfo->tpm2->userauth);
if (r) {
vpn_progress(vpninfo, PRG_ERR,
_("TPM2 Esys_TR_SetAuth failed: 0x%x\n"),
r);
return -EIO;
}
return 0;
}
#define PKCS1_PAD_OVERHEAD 11
/* Signing function for TPM privkeys, set with gnutls_privkey_import_ext() */
static int tpm2_rsa_sign_hash_fn(gnutls_privkey_t key, gnutls_sign_algorithm_t algo,
void *_vpninfo, unsigned int flags,
const gnutls_datum_t *data, gnutls_datum_t *sig)
{
struct openconnect_info *vpninfo = _vpninfo;
int ret = GNUTLS_E_PK_SIGN_FAILED;
ESYS_CONTEXT *ectx = NULL;
TPM2B_PUBLIC_KEY_RSA digest, *tsig = NULL;
TPM2B_DATA label = { .size = 0 };
TPMT_RSA_DECRYPT inScheme = { .scheme = TPM2_ALG_NULL };
ESYS_TR key_handle = ESYS_TR_NONE;
TSS2_RC r;
vpn_progress(vpninfo, PRG_DEBUG,
_("TPM2 RSA sign function called for %d bytes.\n"),
data->size);
digest.size = vpninfo->tpm2->pub.publicArea.unique.rsa.size;
if (data->size + PKCS1_PAD_OVERHEAD > digest.size) {
vpn_progress(vpninfo, PRG_ERR,
_("TPM2 digest too large: %d > %d\n"),
data->size, digest.size - PKCS1_PAD_OVERHEAD);
return GNUTLS_E_PK_SIGN_FAILED;
}
/* PKCS#1 padding */
digest.buffer[0] = 0;
digest.buffer[1] = 1;
memset(digest.buffer + 2, 0xff, digest.size - data->size - 3);
digest.buffer[digest.size - data->size - 1] = 0;
memcpy(digest.buffer + digest.size - data->size, data->data, data->size);
if (init_tpm2_key(&ectx, &key_handle, vpninfo))
goto out;
reauth:
if (auth_tpm2_key(vpninfo, ectx, key_handle))
goto out;
r = Esys_RSA_Decrypt(ectx, key_handle,
ESYS_TR_PASSWORD, ESYS_TR_NONE, ESYS_TR_NONE,
&digest, &inScheme, &label, &tsig);
if (r == 0x9a2) {
vpn_progress(vpninfo, PRG_DEBUG,
_("TPM2 Esys_RSA_Decrypt auth failed\n"));
vpninfo->tpm2->need_userauth = 1;
goto reauth;
}
if (r) {
vpn_progress(vpninfo, PRG_ERR,
_("TPM2 failed to generate RSA signature: 0x%x\n"),
r);
goto out;
}
sig->data = malloc(tsig->size);
if (!sig->data)
goto out;
memcpy(sig->data, tsig->buffer, tsig->size);
sig->size = tsig->size;
ret = 0;
out:
if (tsig)
free(tsig);
if (key_handle != ESYS_TR_NONE)
Esys_FlushContext(ectx, key_handle);
if (ectx)
Esys_Finalize(&ectx);
return ret;
}
/* Signing function for TPM privkeys, set with gnutls_privkey_import_ext() */
static int tpm2_ec_sign_hash_fn(gnutls_privkey_t key, gnutls_sign_algorithm_t algo,
void *_vpninfo, unsigned int flags,
const gnutls_datum_t *data, gnutls_datum_t *sig)
{
struct openconnect_info *vpninfo = _vpninfo;
int ret = GNUTLS_E_PK_SIGN_FAILED;
ESYS_CONTEXT *ectx = NULL;
TPM2B_DIGEST digest;
TPMT_SIGNATURE *tsig = NULL;
ESYS_TR key_handle = ESYS_TR_NONE;
TSS2_RC r;
TPMT_TK_HASHCHECK validation = { .tag = TPM2_ST_HASHCHECK,
.hierarchy = TPM2_RH_NULL,
.digest.size = 0 };
TPMT_SIG_SCHEME inScheme = { .scheme = TPM2_ALG_ECDSA };
struct oc_text_buf *sig_der = NULL;
unsigned char derlen;
vpn_progress(vpninfo, PRG_DEBUG,
_("TPM2 EC sign function called for %d bytes.\n"),
data->size);
switch (algo) {
case GNUTLS_SIGN_ECDSA_SHA1: inScheme.details.ecdsa.hashAlg = TPM2_ALG_SHA1; break;
case GNUTLS_SIGN_ECDSA_SHA256: inScheme.details.ecdsa.hashAlg = TPM2_ALG_SHA256; break;
case GNUTLS_SIGN_ECDSA_SHA384: inScheme.details.ecdsa.hashAlg = TPM2_ALG_SHA384; break;
case GNUTLS_SIGN_ECDSA_SHA512: inScheme.details.ecdsa.hashAlg = TPM2_ALG_SHA512; break;
default:
vpn_progress(vpninfo, PRG_ERR,
_("Unknown TPM2 EC digest size %d\n"),
data->size);
return GNUTLS_E_PK_SIGN_FAILED;
}
memcpy(digest.buffer, data->data, data->size);
digest.size = data->size;
if (init_tpm2_key(&ectx, &key_handle, vpninfo))
goto out;
reauth:
if (auth_tpm2_key(vpninfo, ectx, key_handle))
goto out;
r = Esys_Sign(ectx, key_handle,
ESYS_TR_PASSWORD, ESYS_TR_NONE, ESYS_TR_NONE,
&digest, &inScheme, &validation,
&tsig);
if (r == 0x9a2) {
vpn_progress(vpninfo, PRG_DEBUG,
_("TPM2 Esys_Sign auth failed\n"));
vpninfo->tpm2->need_userauth = 1;
goto reauth;
}
if (r) {
vpn_progress(vpninfo, PRG_ERR,
_("TPM2 failed to generate RSA signature: 0x%x\n"),
r);
goto out;
}
/*
* Create the DER-encoded SEQUENCE containing R and S:
*
* DSASignatureValue ::= SEQUENCE {
* r INTEGER,
* s INTEGER
* }
*/
sig_der = buf_alloc();
buf_append_bytes(sig_der, "\x30\x80", 2); // SEQUENCE, indeterminate length
buf_append_bytes(sig_der, "\x02", 1); // INTEGER
derlen = tsig->signature.ecdsa.signatureR.size;
buf_append_bytes(sig_der, &derlen, 1);
buf_append_bytes(sig_der, tsig->signature.ecdsa.signatureR.buffer, tsig->signature.ecdsa.signatureR.size);
buf_append_bytes(sig_der, "\x02", 1); // INTEGER
derlen = tsig->signature.ecdsa.signatureS.size;
buf_append_bytes(sig_der, &derlen, 1);
buf_append_bytes(sig_der, tsig->signature.ecdsa.signatureS.buffer, tsig->signature.ecdsa.signatureS.size);
/* If the length actually fits in one byte (which it should), do
* it that way. Else, leave it indeterminate and add two
* end-of-contents octets to mark the end of the SEQUENCE. */
if (!buf_error(sig_der) && sig_der->pos <= 0x80)
sig_der->data[1] = sig_der->pos - 2;
else {
buf_append_bytes(sig_der, "\0\0", 2);
if (buf_error(sig_der))
goto out;
}
sig->data = (void *)sig_der->data;
sig->size = sig_der->pos;
sig_der->data = NULL;
ret = 0;
out:
buf_free(sig_der);
free(tsig);
if (key_handle != ESYS_TR_NONE)
Esys_FlushContext(ectx, key_handle);
if (ectx)
Esys_Finalize(&ectx);
return ret;
}
#if GNUTLS_VERSION_NUMBER < 0x030600
static int tpm2_rsa_sign_fn(gnutls_privkey_t key, void *_vpninfo,
const gnutls_datum_t *data, gnutls_datum_t *sig)
{
return tpm2_rsa_sign_hash_fn(key, GNUTLS_SIGN_UNKNOWN, _vpninfo, 0, data, sig);
}
static int tpm2_ec_sign_fn(gnutls_privkey_t key, void *_vpninfo,
const gnutls_datum_t *data, gnutls_datum_t *sig)
{
struct openconnect_info *vpninfo = _vpninfo;
gnutls_sign_algorithm_t algo;
switch (data->size) {
case 20: algo = GNUTLS_SIGN_ECDSA_SHA1; break;
case 32: algo = GNUTLS_SIGN_ECDSA_SHA256; break;
case 48: algo = GNUTLS_SIGN_ECDSA_SHA384; break;
case 64: algo = GNUTLS_SIGN_ECDSA_SHA512; break;
default:
vpn_progress(vpninfo, PRG_ERR,
_("Unknown TPM2 EC digest size %d\n"),
data->size);
return GNUTLS_E_PK_SIGN_FAILED;
}
return tpm2_ec_sign_hash_fn(key, algo, vpninfo, 0, data, sig);
}
#endif
#if GNUTLS_VERSION_NUMBER >= 0x030600
static int rsa_key_info(gnutls_privkey_t key, unsigned int flags, void *_vpninfo)
{
if (flags & GNUTLS_PRIVKEY_INFO_PK_ALGO)
return GNUTLS_PK_RSA;
if (flags & GNUTLS_PRIVKEY_INFO_HAVE_SIGN_ALGO) {
gnutls_sign_algorithm_t algo = GNUTLS_FLAGS_TO_SIGN_ALGO(flags);
switch (algo) {
case GNUTLS_SIGN_RSA_RAW:
case GNUTLS_SIGN_RSA_SHA1:
case GNUTLS_SIGN_RSA_SHA256:
case GNUTLS_SIGN_RSA_SHA384:
case GNUTLS_SIGN_RSA_SHA512:
return 1;
default:
return 0;
}
}
if (flags & GNUTLS_PRIVKEY_INFO_SIGN_ALGO)
return GNUTLS_SIGN_RSA_RAW;
return -1;
}
#endif
#if GNUTLS_VERSION_NUMBER >= 0x030400
static int ec_key_info(gnutls_privkey_t key, unsigned int flags, void *_vpninfo)
{
if (flags & GNUTLS_PRIVKEY_INFO_PK_ALGO)
return GNUTLS_PK_EC;
#ifdef GNUTLS_PRIVKEY_INFO_HAVE_SIGN_ALGO
if (flags & GNUTLS_PRIVKEY_INFO_HAVE_SIGN_ALGO) {
gnutls_sign_algorithm_t algo = GNUTLS_FLAGS_TO_SIGN_ALGO(flags);
switch (algo) {
case GNUTLS_SIGN_ECDSA_SHA1:
case GNUTLS_SIGN_ECDSA_SHA256:
return 1;
default:
return 0;
}
}
#endif
if (flags & GNUTLS_PRIVKEY_INFO_SIGN_ALGO)
return GNUTLS_SIGN_ECDSA_SHA256;
return -1;
}
#endif
int install_tpm2_key(struct openconnect_info *vpninfo, gnutls_privkey_t *pkey, gnutls_datum_t *pkey_sig,
unsigned int parent, int emptyauth, gnutls_datum_t *privdata, gnutls_datum_t *pubdata)
{
TSS2_RC r;
if (parent != 0x40000001) {
vpn_progress(vpninfo, PRG_ERR,
_("Cannot use TPM2 key with non-default parent 0x%x\n"),
parent);
return -EINVAL;
};
vpninfo->tpm2 = calloc(1, sizeof(*vpninfo->tpm2));
if (!vpninfo->tpm2)
return -ENOMEM;
r = Tss2_MU_TPM2B_PRIVATE_Unmarshal(privdata->data, privdata->size, NULL,
&vpninfo->tpm2->priv);
if (r) {
vpn_progress(vpninfo, PRG_ERR,
_("Failed to import TPM2 private key data: 0x%x\n"),
r);
err_out:
release_tpm2_ctx(vpninfo);
return -EINVAL;
}
r = Tss2_MU_TPM2B_PUBLIC_Unmarshal(pubdata->data, pubdata->size, NULL,
&vpninfo->tpm2->pub);
if (r) {
vpn_progress(vpninfo, PRG_ERR,
_("Failed to import TPM2 private key data: 0x%x\n"),
r);
goto err_out;
}
vpninfo->tpm2->need_userauth = !emptyauth;
gnutls_privkey_init(pkey);
switch(vpninfo->tpm2->pub.publicArea.type) {
case TPM2_ALG_RSA:
#if GNUTLS_VERSION_NUMBER >= 0x030600
gnutls_privkey_import_ext4(*pkey, vpninfo, NULL, tpm2_rsa_sign_hash_fn, NULL, NULL, rsa_key_info, 0);
#else
gnutls_privkey_import_ext(*pkey, GNUTLS_PK_RSA, vpninfo, tpm2_rsa_sign_fn, NULL, 0);
#endif
break;
case TPM2_ALG_ECC:
#if GNUTLS_VERSION_NUMBER >= 0x030600
gnutls_privkey_import_ext4(*pkey, vpninfo, NULL, tpm2_ec_sign_hash_fn, NULL, NULL, ec_key_info, 0);
#elif GNUTLS_VERSION_NUMBER >= 0x030400
gnutls_privkey_import_ext3(*pkey, vpninfo, tpm2_ec_sign_fn, NULL, NULL, ec_key_info, 0);
#else
gnutls_privkey_import_ext(*pkey, GNUTLS_PK_EC, vpninfo, tpm2_ec_sign_fn, NULL, 0);
#endif
break;
default:
vpn_progress(vpninfo, PRG_ERR,
_("Unsupported TPM2 key type %d\n"),
vpninfo->tpm2->pub.publicArea.type);
gnutls_privkey_deinit(*pkey);
*pkey = NULL;
goto err_out;
}
return 0;
}
void release_tpm2_ctx(struct openconnect_info *vpninfo)
{
if (vpninfo->tpm2)
free(vpninfo->tpm2);
vpninfo->tpm2 = NULL;
}
#endif /* HAVE_TSS2 */