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gnutls_tpm2_esys.c
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gnutls_tpm2_esys.c
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/*
* OpenConnect (SSL + DTLS) VPN client
*
* Copyright © 2018 David Woodhouse.
*
* Author: David Woodhouse <[email protected]>
*
* 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"
#include <tss2/tss2_mu.h>
#include <tss2/tss2_esys.h>
#include <tss2/tss2_tctildr.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
struct oc_tpm2_ctx {
TSS2_TCTI_CONTEXT *tcti_ctx;
TPM2B_PUBLIC pub;
TPM2B_PRIVATE priv;
TPM2B_DIGEST userauth;
TPM2B_DIGEST ownerauth;
unsigned int need_userauth:1;
unsigned int need_ownerauth:1;
unsigned int did_ownerauth:1;
unsigned int legacy_srk:1;
unsigned int parent;
};
static const TPM2B_PUBLIC primaryTemplate = {
.publicArea = {
.type = TPM2_ALG_ECC,
.nameAlg = TPM2_ALG_SHA256,
.objectAttributes = (TPMA_OBJECT_USERWITHAUTH |
TPMA_OBJECT_RESTRICTED |
TPMA_OBJECT_DECRYPT |
TPMA_OBJECT_FIXEDTPM |
TPMA_OBJECT_FIXEDPARENT |
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 const TPM2B_PUBLIC primaryTemplate_legacy = {
.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 const TPM2B_SENSITIVE_CREATE primarySensitive = {
.sensitive = {
.userAuth = {
.size = 0,
},
.data = {
.size = 0,
}
}
};
static const TPM2B_DATA allOutsideInfo = {
.size = 0,
};
static const TPML_PCR_SELECTION allCreationPCR = {
.count = 0,
};
#define rc_is_key_auth_failed(rc) (((rc) & 0xff) == TPM2_RC_BAD_AUTH)
#define rc_is_parent_auth_failed(rc) (((rc) & 0xff) == TPM2_RC_AUTH_FAIL)
static void install_tpm_passphrase(struct openconnect_info *vpninfo, TPM2B_DIGEST *auth, char *pass)
{
int pwlen = strlen(pass);
if (pwlen > sizeof(auth->buffer) - 1) {
vpn_progress(vpninfo, PRG_ERR,
_("TPM2 password too long; truncating\n"));
pwlen = sizeof(auth->buffer) - 1;
}
auth->size = pwlen;
memcpy(auth->buffer, pass, pwlen);
pass[pwlen] = 0;
free_pass(&pass);
}
static int init_tpm2_primary(struct openconnect_info *vpninfo, struct cert_info *certinfo,
ESYS_CONTEXT *ctx, ESYS_TR *primaryHandle)
{
TSS2_RC r;
const char *hierarchy_name;
ESYS_TR hierarchy;
switch(certinfo->tpm2->parent) {
case TPM2_RH_OWNER: hierarchy = ESYS_TR_RH_OWNER; hierarchy_name = _("owner"); break;
case TPM2_RH_NULL: hierarchy = ESYS_TR_RH_NULL; hierarchy_name = _("null"); break;
case TPM2_RH_ENDORSEMENT:hierarchy = ESYS_TR_RH_ENDORSEMENT; hierarchy_name = _("endorsement"); break;
case TPM2_RH_PLATFORM: hierarchy = ESYS_TR_RH_PLATFORM; hierarchy_name = _("platform"); break;
default: return -EINVAL;
}
vpn_progress(vpninfo, PRG_DEBUG, _("Creating primary key under %s hierarchy.\n"), hierarchy_name);
reauth:
if (certinfo->tpm2->need_ownerauth) {
char *pass = NULL;
if (request_passphrase(vpninfo,
certinfo_string(certinfo, "openconnect_tpm2_hierarchy",
"openconnect_secondary_tpm2_hierarchy"),
&pass,
_("Enter TPM2 %s hierarchy password:"), hierarchy_name))
return -EPERM;
install_tpm_passphrase(vpninfo, &certinfo->tpm2->ownerauth, pass);
certinfo->tpm2->need_ownerauth = 0;
}
r = Esys_TR_SetAuth(ctx, hierarchy, &certinfo->tpm2->ownerauth);
if (r) {
vpn_progress(vpninfo, PRG_ERR,
_("TPM2 Esys_TR_SetAuth failed: 0x%x\n"),
r);
return -EPERM;
}
r = Esys_CreatePrimary(ctx, hierarchy,
ESYS_TR_PASSWORD, ESYS_TR_NONE, ESYS_TR_NONE,
&primarySensitive,
certinfo->tpm2->legacy_srk ? &primaryTemplate_legacy : &primaryTemplate,
&allOutsideInfo, &allCreationPCR,
primaryHandle, NULL, NULL, NULL, NULL);
if (rc_is_key_auth_failed(r)) {
vpn_progress(vpninfo, PRG_DEBUG,
_("TPM2 Esys_CreatePrimary owner auth failed\n"));
certinfo->tpm2->need_ownerauth = 1;
goto reauth;
} else if (r) {
vpn_progress(vpninfo, PRG_ERR,
_("TPM2 Esys_CreatePrimary failed: 0x%x\n"),
r);
return -EIO;
}
return 0;
}
#define parent_is_generated(parent) ((parent) >> TPM2_HR_SHIFT == TPM2_HT_PERMANENT)
#define parent_is_persistent(parent) ((parent) >> TPM2_HR_SHIFT == TPM2_HT_PERSISTENT)
static int init_tpm2_key(ESYS_CONTEXT **ctx, ESYS_TR *keyHandle,
struct openconnect_info *vpninfo, struct cert_info *certinfo)
{
ESYS_TR parentHandle = ESYS_TR_NONE;
TSS2_RC r;
*keyHandle = ESYS_TR_NONE;
vpn_progress(vpninfo, PRG_DEBUG,
_("Establishing connection with TPM.\n"));
r = Esys_Initialize(ctx, certinfo->tpm2->tcti_ctx, 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;
}
if (parent_is_generated(certinfo->tpm2->parent)) {
if (init_tpm2_primary(vpninfo, certinfo, *ctx, &parentHandle))
goto error;
} else {
r = Esys_TR_FromTPMPublic(*ctx, certinfo->tpm2->parent,
ESYS_TR_NONE, ESYS_TR_NONE, ESYS_TR_NONE, &parentHandle);
if (r) {
vpn_progress(vpninfo, PRG_ERR,
_("Esys_TR_FromTPMPublic failed for handle 0x%x: 0x%x\n"),
certinfo->tpm2->parent, r);
goto error;
}
/* If we don't already have a password (and haven't already authenticated
* successfully), check the NODA flag on the parent and demand one if DA
* protection is enabled (since that strongly implies there is a non-empty
* password). */
if (!certinfo->tpm2->did_ownerauth && !certinfo->tpm2->ownerauth.size) {
TPM2B_PUBLIC *pub = NULL;
r = Esys_ReadPublic(*ctx, parentHandle, ESYS_TR_NONE, ESYS_TR_NONE, ESYS_TR_NONE,
&pub, NULL, NULL);
if (!r && !(pub->publicArea.objectAttributes & TPMA_OBJECT_NODA))
certinfo->tpm2->need_ownerauth = 1;
Esys_Free(pub);
}
reauth:
if (certinfo->tpm2->need_ownerauth) {
char *pass = NULL;
if (request_passphrase(vpninfo,
certinfo_string(certinfo, "openconnect_tpm2_parent",
"openconnect_secondary_tpm2_parent"),
&pass,
certinfo_string(certinfo, _("Enter TPM2 parent key password:"),
_("Enter secondary TPM2 parent key password:"))))
return -EPERM;
install_tpm_passphrase(vpninfo, &certinfo->tpm2->ownerauth, pass);
certinfo->tpm2->need_ownerauth = 0;
}
r = Esys_TR_SetAuth(*ctx, parentHandle, &certinfo->tpm2->ownerauth);
if (r) {
vpn_progress(vpninfo, PRG_ERR,
_("TPM2 Esys_TR_SetAuth failed: 0x%x\n"),
r);
goto error;
}
}
vpn_progress(vpninfo, PRG_DEBUG, _("Loading TPM2 key blob, parent %x.\n"), parentHandle);
r = Esys_Load(*ctx, parentHandle,
ESYS_TR_PASSWORD, ESYS_TR_NONE, ESYS_TR_NONE,
&certinfo->tpm2->priv, &certinfo->tpm2->pub,
keyHandle);
if (rc_is_parent_auth_failed(r)) {
vpn_progress(vpninfo, PRG_DEBUG,
_("TPM2 Esys_Load auth failed\n"));
certinfo->tpm2->need_ownerauth = 1;
goto reauth;
}
if (r) {
vpn_progress(vpninfo, PRG_ERR,
_("TPM2 Esys_Load failed: 0x%x\n"),
r);
goto error;
}
certinfo->tpm2->did_ownerauth = 1;
if (parent_is_generated(certinfo->tpm2->parent)) {
r = Esys_FlushContext(*ctx, parentHandle);
if (r) {
vpn_progress(vpninfo, PRG_ERR,
_("TPM2 Esys_FlushContext for generated primary failed: 0x%x\n"),
r);
}
/* But it's non-fatal. */
}
return 0;
error:
if (parent_is_generated(certinfo->tpm2->parent) && parentHandle != ESYS_TR_NONE)
Esys_FlushContext(*ctx, parentHandle);
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, struct cert_info *certinfo,
ESYS_CONTEXT *ctx, ESYS_TR key_handle)
{
TSS2_RC r;
if (certinfo->tpm2->need_userauth) {
char *pass = NULL;
if (certinfo->password) {
pass = certinfo->password;
certinfo->password = NULL;
} else {
int err = request_passphrase(vpninfo,
certinfo_string(certinfo, "openconnect_tpm2_key",
"openconnect_secondary_tpm2_key"),
&pass,
certinfo_string(certinfo, _("Enter TPM2 key password:"),
_("Enter secondary TPM2 key password:")));
if (err)
return err;
}
install_tpm_passphrase(vpninfo, &certinfo->tpm2->userauth, pass);
certinfo->tpm2->need_userauth = 0;
}
r = Esys_TR_SetAuth(ctx, key_handle, &certinfo->tpm2->userauth);
if (r) {
vpn_progress(vpninfo, PRG_ERR,
_("TPM2 Esys_TR_SetAuth failed: 0x%x\n"),
r);
return -EIO;
}
return 0;
}
int tpm2_rsa_sign_hash_fn(gnutls_privkey_t key, gnutls_sign_algorithm_t algo,
void *_certinfo, unsigned int flags,
const gnutls_datum_t *data, gnutls_datum_t *sig)
{
struct cert_info *certinfo = _certinfo;
struct openconnect_info *vpninfo = certinfo->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, algo %s\n"),
data->size, gnutls_sign_get_name(algo));
digest.size = certinfo->tpm2->pub.publicArea.unique.rsa.size;
if (oc_pad_rsasig(vpninfo, algo, digest.buffer, digest.size, data,
certinfo->tpm2->pub.publicArea.parameters.rsaDetail.keyBits))
return GNUTLS_E_PK_SIGN_FAILED;
if (init_tpm2_key(&ectx, &key_handle, vpninfo, certinfo))
goto out;
reauth:
if (auth_tpm2_key(vpninfo, certinfo, 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 (rc_is_key_auth_failed(r)) {
vpn_progress(vpninfo, PRG_DEBUG,
_("TPM2 Esys_RSA_Decrypt auth failed\n"));
certinfo->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:
Esys_Free(tsig);
if (key_handle != ESYS_TR_NONE)
Esys_FlushContext(ectx, key_handle);
if (ectx)
Esys_Finalize(&ectx);
return ret;
}
int tpm2_ec_sign_hash_fn(gnutls_privkey_t key, gnutls_sign_algorithm_t algo,
void *_certinfo, unsigned int flags,
const gnutls_datum_t *data, gnutls_datum_t *sig)
{
struct cert_info *certinfo = _certinfo;
struct openconnect_info *vpninfo = certinfo->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 };
gnutls_datum_t sig_r, sig_s;
vpn_progress(vpninfo, PRG_DEBUG,
_("TPM2 EC sign function called for %d bytes.\n"),
data->size);
/* FIPS-186-4 §6.4 says "When the length of the output of the hash
* function is greater than the bit length of n, then the leftmost
* n bits of the hash function output block shall be used in any
* calculation using the hash function output during the generation
* or verification of a digital signature."
*
* So GnuTLS is expected to *truncate* a larger hash to fit the
* curve bit length, and then we lie to the TPM about which hash
* it was because the TPM only really cares about the size of the
* data anyway. */
switch (data->size) {
case SHA1_SIZE: inScheme.details.ecdsa.hashAlg = TPM2_ALG_SHA1; break;
case SHA256_SIZE: inScheme.details.ecdsa.hashAlg = TPM2_ALG_SHA256; break;
case SHA384_SIZE: inScheme.details.ecdsa.hashAlg = TPM2_ALG_SHA384; break;
case SHA512_SIZE: inScheme.details.ecdsa.hashAlg = TPM2_ALG_SHA512; break;
default:
vpn_progress(vpninfo, PRG_ERR,
_("Unknown TPM2 EC digest size %d for algo 0x%x\n"),
data->size, algo);
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, certinfo))
goto out;
reauth:
if (auth_tpm2_key(vpninfo, certinfo, 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 (rc_is_key_auth_failed(r)) {
vpn_progress(vpninfo, PRG_DEBUG,
_("TPM2 Esys_Sign auth failed\n"));
certinfo->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_r.data = tsig->signature.ecdsa.signatureR.buffer;
sig_r.size = tsig->signature.ecdsa.signatureR.size;
sig_s.data = tsig->signature.ecdsa.signatureS.buffer;
sig_s.size = tsig->signature.ecdsa.signatureS.size;
ret = gnutls_encode_rs_value(sig, &sig_r, &sig_s);
out:
Esys_Free(tsig);
if (key_handle != ESYS_TR_NONE)
Esys_FlushContext(ectx, key_handle);
if (ectx)
Esys_Finalize(&ectx);
return ret;
}
int install_tpm2_key(struct openconnect_info *vpninfo, struct cert_info *certinfo,
gnutls_privkey_t *pkey, gnutls_datum_t *pkey_sig,
unsigned int parent, int emptyauth, int legacy,
gnutls_datum_t *privdata, gnutls_datum_t *pubdata)
{
TSS2_RC r;
if (!parent_is_persistent(parent) &&
parent != TPM2_RH_OWNER && parent != TPM2_RH_NULL &&
parent != TPM2_RH_ENDORSEMENT && parent != TPM2_RH_PLATFORM) {
vpn_progress(vpninfo, PRG_ERR,
_("Invalid TPM2 parent handle 0x%08x\n"), parent);
return -EINVAL;
}
certinfo->tpm2 = calloc(1, sizeof(*certinfo->tpm2));
if (!certinfo->tpm2)
return -ENOMEM;
certinfo->tpm2->parent = parent;
/* This is the variable which the *IBM* TSS uses, to force it to use
* the swtpm; it happens in the library automatically. To allow the
* swtpm test to work on platforms where a real TPM is available,
* emulate the same thing. Not really intended for production use. */
const char *tpm_type = getenv("TPM_INTERFACE_TYPE");
if (tpm_type && !strcmp(tpm_type, "socsim")) {
vpn_progress(vpninfo, PRG_DEBUG,
_("Using SWTPM due to TPM_INTERFACE_TYPE environment variable\n"));
r = Tss2_TctiLdr_Initialize("swtpm", &certinfo->tpm2->tcti_ctx);
if (r) {
vpn_progress(vpninfo, PRG_ERR,
_("TSS2_TctiLdr_Initialize failed for swtpm: 0x%x\n"),
r);
goto err_out;
}
}
r = Tss2_MU_TPM2B_PRIVATE_Unmarshal(privdata->data, privdata->size, NULL,
&certinfo->tpm2->priv);
if (r) {
vpn_progress(vpninfo, PRG_ERR,
_("Failed to import TPM2 private key data: 0x%x\n"),
r);
goto err_out;
}
r = Tss2_MU_TPM2B_PUBLIC_Unmarshal(pubdata->data, pubdata->size, NULL,
&certinfo->tpm2->pub);
if (r) {
vpn_progress(vpninfo, PRG_ERR,
_("Failed to import TPM2 public key data: 0x%x\n"),
r);
goto err_out;
}
certinfo->tpm2->need_userauth = !emptyauth;
certinfo->tpm2->legacy_srk = legacy;
switch(certinfo->tpm2->pub.publicArea.type) {
case TPM2_ALG_RSA: return GNUTLS_PK_RSA;
case TPM2_ALG_ECC: return GNUTLS_PK_ECC;
}
vpn_progress(vpninfo, PRG_ERR,
_("Unsupported TPM2 key type %d\n"),
certinfo->tpm2->pub.publicArea.type);
err_out:
release_tpm2_ctx(vpninfo, certinfo);
return -EINVAL;
}
uint16_t tpm2_key_curve(struct openconnect_info *vpninfo, struct cert_info *certinfo)
{
return certinfo->tpm2->pub.publicArea.parameters.eccDetail.curveID;
}
int tpm2_rsa_key_bits(struct openconnect_info *vpninfo, struct cert_info *certinfo)
{
return certinfo->tpm2->pub.publicArea.parameters.rsaDetail.keyBits;
}
void release_tpm2_ctx(struct openconnect_info *vpninfo, struct cert_info *certinfo)
{
if (certinfo->tpm2) {
clear_mem(certinfo->tpm2->ownerauth.buffer, sizeof(certinfo->tpm2->ownerauth.buffer));
clear_mem(certinfo->tpm2->userauth.buffer, sizeof(certinfo->tpm2->userauth.buffer));
if (certinfo->tpm2->tcti_ctx)
Tss2_TctiLdr_Finalize(&certinfo->tpm2->tcti_ctx);
free(certinfo->tpm2);
}
certinfo->tpm2 = NULL;
}