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wolfTPM/examples/tls/tls_common.h

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/* tls_common.h
*
* Copyright (C) 2006-2018 wolfSSL Inc.
*
* This file is part of wolfTPM.
*
* wolfTPM 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.
*
* wolfTPM 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#ifndef _TPM_TLS_COMMON_H_
#define _TPM_TLS_COMMON_H_
#include <wolftpm/tpm2.h>
#include <wolftpm/tpm2_wrap.h>
#if !defined(WOLFTPM2_NO_WRAPPER) && !defined(WOLFTPM2_NO_WOLFCRYPT)
#include <examples/tpm_io.h>
#include <examples/tpm_test.h>
#include <examples/tls/tls_common.h>
#include <examples/tls/tls_client.h>
#include <wolfssl/ssl.h>
/* TLS Configuration */
#ifndef TLS_HOST
#define TLS_HOST "localhost"
#endif
#ifndef TLS_PORT
#define TLS_PORT 11111
#endif
#ifndef MAX_MSG_SZ
#define MAX_MSG_SZ (1 * 1024)
#endif
#ifndef TOTAL_MSG_SZ
#define TOTAL_MSG_SZ (16 * 1024)
#endif
/* force use of a TLS cipher suite */
#if 0
#ifndef TLS_CIPHER_SUITE
#define TLS_CIPHER_SUITE "ECDHE-RSA-AES128-SHA256"
#endif
#endif
/* disable mutual auth for client */
#if 0
#define NO_TLS_MUTUAL_AUTH
#endif
/* enable for testing ECC key/cert when RSA is enabled */
#if 0
#define TLS_USE_ECC
#endif
/* enable benchmarking mode */
#if 0
#define TLS_BENCH_MODE
#endif
#ifdef TLS_BENCH_MODE
extern double benchStart;
#endif
/******************************************************************************/
/* --- BEGIN Socket IO Callbacks --- */
/******************************************************************************/
typedef struct SockIoCbCtx {
int listenFd;
int fd;
} SockIoCbCtx;
#ifndef WOLFSSL_USER_IO
/* socket includes */
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <unistd.h>
static inline int SockIORecv(WOLFSSL* ssl, char* buff, int sz, void* ctx)
{
SockIoCbCtx* sockCtx = (SockIoCbCtx*)ctx;
int recvd;
(void)ssl;
/* Receive message from socket */
if ((recvd = (int)recv(sockCtx->fd, buff, sz, 0)) == -1) {
/* error encountered. Be responsible and report it in wolfSSL terms */
printf("IO RECEIVE ERROR: ");
switch (errno) {
#if EAGAIN != EWOULDBLOCK
case EAGAIN: /* EAGAIN == EWOULDBLOCK on some systems, but not others */
#endif
case EWOULDBLOCK:
if (wolfSSL_get_using_nonblock(ssl)) {
printf("would block\n");
return WOLFSSL_CBIO_ERR_WANT_READ;
}
else {
printf("socket timeout\n");
return WOLFSSL_CBIO_ERR_TIMEOUT;
}
case ECONNRESET:
printf("connection reset\n");
return WOLFSSL_CBIO_ERR_CONN_RST;
case EINTR:
printf("socket interrupted\n");
return WOLFSSL_CBIO_ERR_ISR;
case ECONNREFUSED:
printf("connection refused\n");
return WOLFSSL_CBIO_ERR_WANT_READ;
case ECONNABORTED:
printf("connection aborted\n");
return WOLFSSL_CBIO_ERR_CONN_CLOSE;
default:
printf("general error\n");
return WOLFSSL_CBIO_ERR_GENERAL;
}
}
else if (recvd == 0) {
printf("Connection closed\n");
return WOLFSSL_CBIO_ERR_CONN_CLOSE;
}
#ifdef TLS_BENCH_MODE
{
const double zeroVal = 0.0;
if (XMEMCMP(&benchStart, &zeroVal, sizeof(double)) == 0) {
benchStart = gettime_secs(1);
}
}
#endif
#ifdef DEBUG_WOLFTPM
/* successful receive */
printf("SockIORecv: received %d bytes from %d\n", sz, sockCtx->fd);
#endif
return recvd;
}
static inline int SockIOSend(WOLFSSL* ssl, char* buff, int sz, void* ctx)
{
SockIoCbCtx* sockCtx = (SockIoCbCtx*)ctx;
int sent;
(void)ssl;
/* Receive message from socket */
if ((sent = (int)send(sockCtx->fd, buff, sz, 0)) == -1) {
/* error encountered. Be responsible and report it in wolfSSL terms */
printf("IO SEND ERROR: ");
switch (errno) {
#if EAGAIN != EWOULDBLOCK
case EAGAIN: /* EAGAIN == EWOULDBLOCK on some systems, but not others */
#endif
case EWOULDBLOCK:
printf("would block\n");
return WOLFSSL_CBIO_ERR_WANT_READ;
case ECONNRESET:
printf("connection reset\n");
return WOLFSSL_CBIO_ERR_CONN_RST;
case EINTR:
printf("socket interrupted\n");
return WOLFSSL_CBIO_ERR_ISR;
case EPIPE:
printf("socket EPIPE\n");
return WOLFSSL_CBIO_ERR_CONN_CLOSE;
default:
printf("general error\n");
return WOLFSSL_CBIO_ERR_GENERAL;
}
}
else if (sent == 0) {
printf("Connection closed\n");
return 0;
}
#ifdef DEBUG_WOLFTPM
/* successful send */
printf("SockIOSend: sent %d bytes to %d\n", sz, sockCtx->fd);
#endif
return sent;
}
static inline int SetupSocketAndListen(SockIoCbCtx* sockIoCtx, word32 port)
{
struct sockaddr_in servAddr;
int optval = 1;
/* Setup server address */
memset(&servAddr, 0, sizeof(servAddr));
servAddr.sin_family = AF_INET;
servAddr.sin_port = htons(port);
servAddr.sin_addr.s_addr = INADDR_ANY;
/* Create a socket that uses an Internet IPv4 address,
* Sets the socket to be stream based (TCP),
* 0 means choose the default protocol. */
if ((sockIoCtx->listenFd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
printf("ERROR: failed to create the socket\n");
return -1;
}
/* allow reuse */
if (setsockopt(sockIoCtx->listenFd, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof(optval)) == -1) {
printf("setsockopt SO_REUSEADDR failed\n");
return -1;
}
/* Connect to the server */
if (bind(sockIoCtx->listenFd, (struct sockaddr*)&servAddr,
sizeof(servAddr)) == -1) {
printf("ERROR: failed to bind\n");
return -1;
}
if (listen(sockIoCtx->listenFd, 5) != 0) {
printf("ERROR: failed to listen\n");
return -1;
}
return 0;
}
static inline int SocketWaitClient(SockIoCbCtx* sockIoCtx)
{
int connd;
struct sockaddr_in clientAddr;
socklen_t size = sizeof(clientAddr);
if ((connd = accept(sockIoCtx->listenFd, (struct sockaddr*)&clientAddr, &size)) == -1) {
printf("ERROR: failed to accept the connection\n\n");
return -1;
}
sockIoCtx->fd = connd;
return 0;
}
static inline int SetupSocketAndConnect(SockIoCbCtx* sockIoCtx, const char* host,
word32 port)
{
struct sockaddr_in servAddr;
struct hostent* entry;
/* Setup server address */
memset(&servAddr, 0, sizeof(servAddr));
servAddr.sin_family = AF_INET;
servAddr.sin_port = htons(port);
/* Resolve host */
entry = gethostbyname(host);
if (entry) {
XMEMCPY(&servAddr.sin_addr.s_addr, entry->h_addr_list[0],
entry->h_length);
}
else {
servAddr.sin_addr.s_addr = inet_addr(host);
}
/* Create a socket that uses an Internet IPv4 address,
* Sets the socket to be stream based (TCP),
* 0 means choose the default protocol. */
if ((sockIoCtx->fd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
printf("ERROR: failed to create the socket\n");
return -1;
}
/* Connect to the server */
if (connect(sockIoCtx->fd, (struct sockaddr*)&servAddr,
sizeof(servAddr)) == -1) {
printf("ERROR: failed to connect\n");
return -1;
}
return 0;
}
static inline void CloseAndCleanupSocket(SockIoCbCtx* sockIoCtx)
{
if (sockIoCtx->fd != -1) {
close(sockIoCtx->fd);
sockIoCtx->fd = -1;
}
if (sockIoCtx->listenFd != -1) {
close(sockIoCtx->listenFd);
sockIoCtx->listenFd = -1;
}
}
#else
/* Provide you own socket implementation code */
int SockIORecv(WOLFSSL* ssl, char* buff, int sz, void* ctx);
int SockIOSend(WOLFSSL* ssl, char* buff, int sz, void* ctx);
int SetupSocketAndConnect(SockIoCbCtx* sockIoCtx, const char* host,
word32 port);
void CloseAndCleanupSocket(SockIoCbCtx* sockIoCtx);
int SetupSocketAndListen(SockIoCbCtx* sockIoCtx, word32 port);
int SocketWaitClient(SockIoCbCtx* sockIoCtx);
#endif /* !WOLFSSL_USER_IO */
/******************************************************************************/
/* --- END Socket IO Callbacks --- */
/******************************************************************************/
/******************************************************************************/
/* --- BEGIN Supporting TLS functions --- */
/******************************************************************************/
static inline int myVerify(int preverify, WOLFSSL_X509_STORE_CTX* store)
{
/* Verify Callback Arguments:
* preverify: 1=Verify Okay, 0=Failure
* store->current_cert: Current WOLFSSL_X509 object (only with OPENSSL_EXTRA)
* store->error_depth: Current Index
* store->domain: Subject CN as string (null term)
* store->totalCerts: Number of certs presented by peer
* store->certs[i]: A `WOLFSSL_BUFFER_INFO` with plain DER for each cert
* store->store: WOLFSSL_X509_STORE with CA cert chain
* store->store->cm: WOLFSSL_CERT_MANAGER
* store->ex_data: The WOLFSSL object pointer
*/
printf("In verification callback, error = %d, %s\n",
store->error, wolfSSL_ERR_reason_error_string(store->error));
printf("\tPeer certs: %d\n", store->totalCerts);
printf("\tSubject's domain name at %d is %s\n",
store->error_depth, store->domain);
(void)preverify;
/* If error indicate we are overriding it for testing purposes */
if (store->error != 0) {
printf("\tAllowing failed certificate check, testing only "
"(shouldn't do this in production)\n");
}
/* A non-zero return code indicates failure override */
return 1;
}
#if defined(WOLF_CRYPTO_DEV) || defined(WOLF_CRYPTO_CB)
/* Function checks key to see if its the "dummy" key */
static inline int myTpmCheckKey(wc_CryptoInfo* info, TpmCryptoDevCtx* ctx)
{
int ret = 0;
#ifndef NO_RSA
if (info && info->pk.type == WC_PK_TYPE_RSA) {
byte e[sizeof(word32)], e2[sizeof(word32)];
byte n[WOLFTPM2_WRAP_RSA_KEY_BITS/8], n2[WOLFTPM2_WRAP_RSA_KEY_BITS/8];
word32 eSz = sizeof(e), e2Sz = sizeof(e);
word32 nSz = sizeof(n), n2Sz = sizeof(n);
RsaKey rsakey;
word32 idx = 0;
/* export the raw public RSA portion */
ret = wc_RsaFlattenPublicKey(info->pk.rsa.key, e, &eSz, n, &nSz);
if (ret == 0) {
/* load the modulus for the dummy key */
ret = wc_InitRsaKey(&rsakey, NULL);
if (ret == 0) {
ret = wc_RsaPrivateKeyDecode(DUMMY_RSA_KEY, &idx, &rsakey,
(word32)sizeof(DUMMY_RSA_KEY));
if (ret == 0) {
ret = wc_RsaFlattenPublicKey(&rsakey, e2, &e2Sz, n2, &n2Sz);
}
wc_FreeRsaKey(&rsakey);
}
}
if (ret == 0 && XMEMCMP(n, n2, nSz) == 0) {
#ifdef DEBUG_WOLFTPM
printf("Detected dummy key, so using TPM RSA key handle\n");
#endif
ret = 1;
}
}
#endif
#if defined(HAVE_ECC)
if (info && info->pk.type == WC_PK_TYPE_ECDSA_SIGN) {
byte qx[WOLFTPM2_WRAP_ECC_KEY_BITS/8], qx2[WOLFTPM2_WRAP_ECC_KEY_BITS/8];
byte qy[WOLFTPM2_WRAP_ECC_KEY_BITS/8], qy2[WOLFTPM2_WRAP_ECC_KEY_BITS/8];
word32 qxSz = sizeof(qx), qx2Sz = sizeof(qx2);
word32 qySz = sizeof(qy), qy2Sz = sizeof(qy2);
ecc_key eccKey;
word32 idx = 0;
/* export the raw public ECC portion */
ret = wc_ecc_export_public_raw(info->pk.eccsign.key, qx, &qxSz, qy, &qySz);
if (ret == 0) {
/* load the ECC public x/y for the dummy key */
ret = wc_ecc_init(&eccKey);
if (ret == 0) {
ret = wc_EccPrivateKeyDecode(DUMMY_ECC_KEY, &idx, &eccKey,
(word32)sizeof(DUMMY_ECC_KEY));
if (ret == 0) {
ret = wc_ecc_export_public_raw(&eccKey, qx2, &qx2Sz, qy2, &qy2Sz);
}
wc_ecc_free(&eccKey);
}
}
if (ret == 0 && XMEMCMP(qx, qx2, qxSz) == 0 &&
XMEMCMP(qy, qy2, qySz) == 0) {
#ifdef DEBUG_WOLFTPM
printf("Detected dummy key, so using TPM ECC key handle\n");
#endif
ret = 1;
}
}
#endif
(void)info;
(void)ctx;
/* non-zero return code means its a "dummy" key (not valid) and the
provided TPM handle will be used, not the wolf public key info */
return ret;
}
#endif /* WOLF_CRYPTO_DEV || WOLF_CRYPTO_CB */
/******************************************************************************/
/* --- END Supporting TLS functions --- */
/******************************************************************************/
#endif /* !WOLFTPM2_NO_WRAPPER && !WOLFTPM2_NO_WOLFCRYPT */
#endif /* _TPM_TLS_COMMON_H_ */
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