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mbedtls/yotta/data/example-tls-client/main.cpp
Manuel Pégourié-Gonnard 1a18aaecde Update output of example-tls-client in its readme
2015-08-18 20:38:22 +02:00

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/*
* Hello world example of a TLS client: fetch an HTTPS page
*
* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
*
* This file is part of mbed TLS (https://tls.mbed.org)
*
* 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.
*
* 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.
*
* 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.
*/
#if !defined(TARGET_LIKE_MBED)
#include <stdio.h>
int main() {
printf("this program only works on mbed OS\n");
return 0;
}
#else
/** \file main.cpp
* \brief An example TLS Client application
* This application sends an HTTPS request to developer.mbed.org and searches for a string in
* the result.
*
* This example is implemented as a logic class (HelloHTTPS) wrapping a TCP socket.
* The logic class handles all events, leaving the main loop to just check if the process
* has finished.
*/
/* Change to a number between 1 and 4 to debug the TLS connection */
#define DEBUG_LEVEL 0
/* Change to 1 to skip certificate verification (UNSAFE, for debug only!) */
#define UNSAFE 0
#include "mbed.h"
#include "EthernetInterface.h"
#include "mbed-net-sockets/TCPStream.h"
#include "test_env.h"
#include "minar/minar.h"
#include "lwipv4_init.h"
#include "mbedtls/ssl.h"
#include "mbedtls/entropy.h"
#include "mbedtls/ctr_drbg.h"
#include "mbedtls/error.h"
#if DEBUG_LEVEL > 0
#include "mbedtls/debug.h"
#endif
namespace {
const char *HTTPS_SERVER_NAME = "developer.mbed.org";
const int HTTPS_SERVER_PORT = 443;
const int RECV_BUFFER_SIZE = 600;
const char HTTPS_PATH[] = "/media/uploads/mbed_official/hello.txt";
const size_t HTTPS_PATH_LEN = sizeof(HTTPS_PATH) - 1;
/* Test related data */
const char *HTTPS_OK_STR = "200 OK";
const char *HTTPS_HELLO_STR = "Hello world!";
/* personalization string for the drbg */
const char *DRBG_PERS = "mbed TLS helloword client";
/* List of trusted root CA certificates
* currently just Verisign since it's the root used by developer.mbed.org
* If you want to trust more that one root, just concatenate them.
*/
const char SSL_CA_PEM[] =
"-----BEGIN CERTIFICATE-----\n"
"MIIDdTCCAl2gAwIBAgILBAAAAAABFUtaw5QwDQYJKoZIhvcNAQEFBQAwVzELMAkG\n"
"A1UEBhMCQkUxGTAXBgNVBAoTEEdsb2JhbFNpZ24gbnYtc2ExEDAOBgNVBAsTB1Jv\n"
"b3QgQ0ExGzAZBgNVBAMTEkdsb2JhbFNpZ24gUm9vdCBDQTAeFw05ODA5MDExMjAw\n"
"MDBaFw0yODAxMjgxMjAwMDBaMFcxCzAJBgNVBAYTAkJFMRkwFwYDVQQKExBHbG9i\n"
"YWxTaWduIG52LXNhMRAwDgYDVQQLEwdSb290IENBMRswGQYDVQQDExJHbG9iYWxT\n"
"aWduIFJvb3QgQ0EwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDaDuaZ\n"
"jc6j40+Kfvvxi4Mla+pIH/EqsLmVEQS98GPR4mdmzxzdzxtIK+6NiY6arymAZavp\n"
"xy0Sy6scTHAHoT0KMM0VjU/43dSMUBUc71DuxC73/OlS8pF94G3VNTCOXkNz8kHp\n"
"1Wrjsok6Vjk4bwY8iGlbKk3Fp1S4bInMm/k8yuX9ifUSPJJ4ltbcdG6TRGHRjcdG\n"
"snUOhugZitVtbNV4FpWi6cgKOOvyJBNPc1STE4U6G7weNLWLBYy5d4ux2x8gkasJ\n"
"U26Qzns3dLlwR5EiUWMWea6xrkEmCMgZK9FGqkjWZCrXgzT/LCrBbBlDSgeF59N8\n"
"9iFo7+ryUp9/k5DPAgMBAAGjQjBAMA4GA1UdDwEB/wQEAwIBBjAPBgNVHRMBAf8E\n"
"BTADAQH/MB0GA1UdDgQWBBRge2YaRQ2XyolQL30EzTSo//z9SzANBgkqhkiG9w0B\n"
"AQUFAAOCAQEA1nPnfE920I2/7LqivjTFKDK1fPxsnCwrvQmeU79rXqoRSLblCKOz\n"
"yj1hTdNGCbM+w6DjY1Ub8rrvrTnhQ7k4o+YviiY776BQVvnGCv04zcQLcFGUl5gE\n"
"38NflNUVyRRBnMRddWQVDf9VMOyGj/8N7yy5Y0b2qvzfvGn9LhJIZJrglfCm7ymP\n"
"AbEVtQwdpf5pLGkkeB6zpxxxYu7KyJesF12KwvhHhm4qxFYxldBniYUr+WymXUad\n"
"DKqC5JlR3XC321Y9YeRq4VzW9v493kHMB65jUr9TU/Qr6cf9tveCX4XSQRjbgbME\n"
"HMUfpIBvFSDJ3gyICh3WZlXi/EjJKSZp4A==\n"
"-----END CERTIFICATE-----\n";
}
using namespace mbed::Sockets::v0;
/**
* \brief HelloHTTPS implements the logic for fetching a file from a webserver
* using a TCP socket and parsing the result.
*/
class HelloHTTPS {
public:
/**
* HelloHTTPS Constructor
* Initializes the TCP socket, sets up event handlers and flags.
*
* Note that CThunk is used for event handlers. This will be changed to a C++
* function pointer in an upcoming release.
*
*
* @param[in] domain The domain name to fetch from
* @param[in] port The port of the HTTPS server
*/
HelloHTTPS(const char * domain, const uint16_t port) :
_stream(SOCKET_STACK_LWIP_IPV4), _domain(domain), _port(port)
{
_error = false;
_gothello = false;
_got200 = false;
_bpos = 0;
_request_sent = 0;
_stream.open(SOCKET_AF_INET4);
mbedtls_entropy_init(&_entropy);
mbedtls_ctr_drbg_init(&_ctr_drbg);
mbedtls_x509_crt_init(&_cacert);
mbedtls_ssl_init(&_ssl);
mbedtls_ssl_config_init(&_ssl_conf);
}
/**
* Initiate the test.
*
* Starts by clearing test flags, then resolves the address with DNS.
*
* @param[in] path The path of the file to fetch from the HTTPS server
* @return SOCKET_ERROR_NONE on success, or an error code on failure
*/
void startTest(const char *path) {
/* Initialize the flags */
_got200 = false;
_gothello = false;
_error = false;
_disconnected = false;
_request_sent = false;
/* Fill the request buffer */
_bpos = snprintf(_buffer, sizeof(_buffer) - 1, "GET %s HTTP/1.1\nHost: %s\n\n", path, HTTPS_SERVER_NAME);
/*
* Initialize TLS-related stuf.
*/
int ret;
if ((ret = mbedtls_ctr_drbg_seed(&_ctr_drbg, mbedtls_entropy_func, &_entropy,
(const unsigned char *) DRBG_PERS,
sizeof (DRBG_PERS))) != 0) {
print_mbedtls_error("mbedtls_crt_drbg_init", ret);
_error = true;
return;
}
if ((ret = mbedtls_x509_crt_parse(&_cacert, (const unsigned char *) SSL_CA_PEM,
sizeof (SSL_CA_PEM))) != 0) {
print_mbedtls_error("mbedtls_x509_crt_parse", ret);
_error = true;
return;
}
if ((ret = mbedtls_ssl_config_defaults(&_ssl_conf,
MBEDTLS_SSL_IS_CLIENT,
MBEDTLS_SSL_TRANSPORT_STREAM,
MBEDTLS_SSL_PRESET_DEFAULT)) != 0) {
print_mbedtls_error("mbedtls_ssl_config_defaults", ret);
_error = true;
return;
}
mbedtls_ssl_conf_ca_chain(&_ssl_conf, &_cacert, NULL);
mbedtls_ssl_conf_rng(&_ssl_conf, mbedtls_ctr_drbg_random, &_ctr_drbg);
#if UNSAFE
mbedtls_ssl_conf_authmode(&_ssl_conf, MBEDTLS_SSL_VERIFY_OPTIONAL);
#endif
#if DEBUG_LEVEL > 0
mbedtls_ssl_conf_verify(&_ssl_conf, my_verify, NULL);
mbedtls_ssl_conf_dbg(&_ssl_conf, my_debug, NULL);
mbedtls_debug_set_threshold(DEBUG_LEVEL);
#endif
if ((ret = mbedtls_ssl_setup(&_ssl, &_ssl_conf)) != 0) {
print_mbedtls_error("mbedtls_ssl_setup", ret);
_error = true;
return;
}
mbedtls_ssl_set_hostname(&_ssl, HTTPS_SERVER_NAME);
mbedtls_ssl_set_bio(&_ssl, static_cast<void *>(&_stream),
ssl_send, ssl_recv, NULL );
/* Connect to the server */
printf("Starting DNS lookup for %s\r\n", _domain);
/* Resolve the domain name: */
socket_error_t err = _stream.resolve(_domain, TCPStream::DNSHandler_t(this, &HelloHTTPS::onDNS));
_stream.error_check(err);
}
/**
* Check if the test has completed.
* @return Returns true if done, false otherwise.
*/
bool done() {
return _error || (_got200 && _gothello);
}
/**
* Check if there was an error
* @return Returns true if there was an error, false otherwise.
*/
bool error() {
return _error;
}
/**
* Closes the TCP socket
*/
void close() {
_stream.close();
while (!_disconnected)
__WFI();
}
protected:
/**
* Helper for pretty-printing mbed TLS error codes
*/
static void print_mbedtls_error(const char *name, int err) {
char buf[128];
mbedtls_strerror(err, buf, sizeof (buf));
printf("%s() failed: -0x%04x (%d): %s\r\n", name, -err, err, buf);
}
#if DEBUG_LEVEL > 0
/**
* Debug callback for mbed TLS
* Just prints on the USB serial port
*/
static void my_debug(void *ctx, int level, const char *str)
{
(void) ctx;
(void) level;
printf("%s", str);
}
/**
* Certificate verification callback for mbed TLS
* Here we only use it to display information on each cert in the chain
*/
static int my_verify(void *data, mbedtls_x509_crt *crt, int depth, int *flags)
{
char buf[1024];
(void) data;
printf("\nVerifying certificate at depth %d:\n", depth);
mbedtls_x509_crt_info(buf, sizeof (buf) - 1, " ", crt);
printf("%s", buf);
if (*flags == 0)
printf("No verification issue for this certificate\n");
else
{
mbedtls_x509_crt_verify_info(buf, sizeof (buf), " ! ", *flags);
printf("%s\n", buf);
}
return 0;
}
#endif
/**
* Receive callback for mbed TLS
*/
static int ssl_recv(void *ctx, unsigned char *buf, size_t len) {
TCPStream *stream = static_cast<TCPStream *>(ctx);
socket_error_t err = stream->recv(buf, &len);
if (err == SOCKET_ERROR_NONE) {
return static_cast<int>(len);
} else if (err == SOCKET_ERROR_WOULD_BLOCK) {
return MBEDTLS_ERR_SSL_WANT_READ;
} else {
return -1;
}
}
/**
* Send callback for mbed TLS
*/
static int ssl_send(void *ctx, const unsigned char *buf, size_t len) {
TCPStream *stream = static_cast<TCPStream *>(ctx);
socket_error_t err = stream->send(buf, len);
if (err == SOCKET_ERROR_NONE) {
return static_cast<int>(len);
} else if (err == SOCKET_ERROR_WOULD_BLOCK) {
return MBEDTLS_ERR_SSL_WANT_WRITE;
} else {
return -1;
}
}
void onError(Socket *s, socket_error_t err) {
(void) s;
printf("MBED: Socket Error: %s (%d)\r\n", socket_strerror(err), err);
_stream.close();
_error = true;
MBED_HOSTTEST_RESULT(false);
}
/**
* On Connect handler
* Starts the TLS handshake
*/
void onConnect(TCPStream *s) {
char buf[16];
_remoteAddr.fmtIPv4(buf,sizeof(buf));
printf("Connected to %s:%d\r\n", buf, _port);
s->setOnReadable(TCPStream::ReadableHandler_t(this, &HelloHTTPS::onReceive));
s->setOnDisconnect(TCPStream::DisconnectHandler_t(this, &HelloHTTPS::onDisconnect));
/* Start the handshake, the rest will be done in onReceive() */
printf("Starting the TLS handshake...\r\n");
int ret = mbedtls_ssl_handshake(&_ssl);
if (ret < 0) {
if (ret != MBEDTLS_ERR_SSL_WANT_READ &&
ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
print_mbedtls_error("mbedtls_ssl_handshake", ret);
onError(s, SOCKET_ERROR_UNKNOWN);
}
return;
}
}
/**
* On Receive handler
* Parses the response from the server, to check for the HTTPS 200 status code and the expected response ("Hello World!")
*/
void onReceive(Socket *s) {
/* Send request if not done yet */
if (!_request_sent) {
int ret = mbedtls_ssl_write(&_ssl, (const unsigned char *) _buffer, _bpos);
if (ret < 0) {
if (ret != MBEDTLS_ERR_SSL_WANT_READ &&
ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
print_mbedtls_error("mbedtls_ssl_write", ret);
onError(s, SOCKET_ERROR_UNKNOWN);
}
return;
}
/* If we get here, the request was sent */
_request_sent = 1;
/* It also means the handshake is done, time to print info */
printf("TLS connection to %s established\r\n", HTTPS_SERVER_NAME);
{
char buf[1024];
mbedtls_x509_crt_info(buf, sizeof(buf), "\r ",
mbedtls_ssl_get_peer_cert(&_ssl));
printf("Server certificate:\r\n%s\r", buf);
#if defined(UNSAFE)
uint32_t flags = mbedtls_ssl_get_verify_result(&_ssl);
if( flags != 0 )
{
mbedtls_x509_crt_verify_info(buf, sizeof (buf), "\r ! ", flags);
printf("Certificate verification failed:\r\n%s\r\r\n", buf);
}
else
#endif
printf("Certificate verification passed\r\n\r\n");
}
}
/* Read data out of the socket */
int ret = mbedtls_ssl_read(&_ssl, (unsigned char *) _buffer, sizeof(_buffer));
if (ret < 0) {
if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
print_mbedtls_error("mbedtls_ssl_read", ret);
onError(s, SOCKET_ERROR_UNKNOWN);
}
return;
}
_bpos = static_cast<size_t>(ret);
_buffer[_bpos] = 0;
/* Check each of the flags */
_got200 = _got200 || strstr(_buffer, HTTPS_OK_STR) != NULL;
_gothello = _gothello || strstr(_buffer, HTTPS_HELLO_STR) != NULL;
/* Print status messages */
printf("HTTPS: Received %d chars from server\r\n", _bpos);
printf("HTTPS: Received 200 OK status ... %s\r\n", _got200 ? "[OK]" : "[FAIL]");
printf("HTTPS: Received '%s' status ... %s\r\n", HTTPS_HELLO_STR, _gothello ? "[OK]" : "[FAIL]");
printf("HTTPS: Received message:\r\n\r\n");
printf("%s", _buffer);
_error = !(_got200 && _gothello);
s->close();
}
/**
* On DNS Handler
* Reads the address returned by DNS, then starts the connect process.
*/
void onDNS(Socket *s, struct socket_addr addr, const char *domain) {
/* Check that the result is a valid DNS response */
if (socket_addr_is_any(&addr)) {
/* Could not find DNS entry */
printf("Could not find DNS entry for %s", HTTPS_SERVER_NAME);
onError(s, SOCKET_ERROR_DNS_FAILED);
} else {
/* Start connecting to the remote host */
char buf[16];
_remoteAddr.setAddr(&addr);
_remoteAddr.fmtIPv4(buf,sizeof(buf));
printf("DNS Response Received:\r\n%s: %s\r\n", domain, buf);
printf("Connecting to %s:%d\r\n", buf, _port);
socket_error_t err = _stream.connect(_remoteAddr, _port, TCPStream::ConnectHandler_t(this, &HelloHTTPS::onConnect));
if (err != SOCKET_ERROR_NONE) {
onError(s, err);
}
}
}
void onDisconnect(TCPStream *s) {
s->close();
MBED_HOSTTEST_RESULT(!error());
}
protected:
TCPStream _stream; /**< The TCP Socket */
const char *_domain; /**< The domain name of the HTTPS server */
const uint16_t _port; /**< The HTTPS server port */
char _buffer[RECV_BUFFER_SIZE]; /**< The response buffer */
size_t _bpos; /**< The current offset in the response buffer */
SocketAddr _remoteAddr; /**< The remote address */
volatile bool _got200; /**< Status flag for HTTPS 200 */
volatile bool _gothello; /**< Status flag for finding the test string */
volatile bool _error; /**< Status flag for an error */
volatile bool _disconnected;
volatile bool _request_sent;
mbedtls_entropy_context _entropy;
mbedtls_ctr_drbg_context _ctr_drbg;
mbedtls_x509_crt _cacert;
mbedtls_ssl_context _ssl;
mbedtls_ssl_config _ssl_conf;
};
/**
* The main loop of the HTTPS Hello World test
*/
EthernetInterface eth;
HelloHTTPS *hello;
void app_start(int, char*[]) {
/* The default 9600 bps is too slow to print full TLS debug info and could
* cause the other party to time out. Select a higher baud rate for
* printf(), regardless of debug level for the sake of uniformity. */
Serial pc(USBTX, USBRX);
pc.baud(115200);
MBED_HOSTTEST_TIMEOUT(120);
MBED_HOSTTEST_SELECT(default);
MBED_HOSTTEST_DESCRIPTION(mbed TLS example HTTPS client);
MBED_HOSTTEST_START("MBEDTLS_EX_HTTPS_CLIENT");
/* Initialise with DHCP, connect, and start up the stack */
eth.init();
eth.connect();
lwipv4_socket_init();
hello = new HelloHTTPS(HTTPS_SERVER_NAME, HTTPS_SERVER_PORT);
printf("Client IP Address is %s\r\n", eth.getIPAddress());
mbed::FunctionPointer1<void, const char*> fp(hello, &HelloHTTPS::startTest);
minar::Scheduler::postCallback(fp.bind(HTTPS_PATH));
}
#endif /* TARGET_LIKE_MBED */
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