Matthew Else
Fork of mbed-http
Diff: source/https_request.h
- Revision:
- 0:910f5949759f
- Child:
- 6:112d72c60e07
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/source/https_request.h Thu Feb 16 11:35:56 2017 +0100
@@ -0,0 +1,445 @@
+/*
+ * PackageLicenseDeclared: Apache-2.0
+ * Copyright (c) 2017 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef _MBED_HTTPS_REQUEST_H_
+#define _MBED_HTTPS_REQUEST_H_
+
+/* Change to a number between 1 and 4 to debug the TLS connection */
+#define DEBUG_LEVEL 0
+
+#include <string>
+#include <vector>
+#include <map>
+#include "http_parser.h"
+#include "http_response.h"
+#include "http_request_builder.h"
+#include "http_response_parser.h"
+#include "http_parsed_url.h"
+
+#include "mbedtls/platform.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
+
+/**
+ * \brief HttpsRequest implements the logic for interacting with HTTPS servers.
+ */
+class HttpsRequest {
+public:
+ /**
+ * HttpsRequest Constructor
+ * Initializes the TCP socket, sets up event handlers and flags.
+ *
+ * @param[in] net_iface The network interface
+ * @param[in] ssl_ca_pem String containing the trusted CAs
+ * @param[in] method HTTP method to use
+ * @param[in] url URL to the resource
+ * @param[in] body_callback Callback on which to retrieve chunks of the response body.
+ If not set, the complete body will be allocated on the HttpResponse object,
+ which might use lots of memory.
+ */
+ HttpsRequest(NetworkInterface* net_iface,
+ const char* ssl_ca_pem,
+ http_method method,
+ const char* url,
+ Callback<void(const char *at, size_t length)> body_callback = 0)
+ {
+ _parsed_url = new ParsedUrl(url);
+ _body_callback = body_callback;
+ _tcpsocket = new TCPSocket(net_iface);
+ _request_builder = new HttpRequestBuilder(method, _parsed_url);
+ _response = NULL;
+ _debug = false;
+ _ssl_ca_pem = ssl_ca_pem;
+
+ DRBG_PERS = "mbed TLS helloword client";
+
+ 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);
+ }
+
+ /**
+ * HttpsRequest Destructor
+ */
+ ~HttpsRequest() {
+ mbedtls_entropy_free(&_entropy);
+ mbedtls_ctr_drbg_free(&_ctr_drbg);
+ mbedtls_x509_crt_free(&_cacert);
+ mbedtls_ssl_free(&_ssl);
+ mbedtls_ssl_config_free(&_ssl_conf);
+
+ if (_request_builder) {
+ delete _request_builder;
+ }
+
+ if (_tcpsocket) {
+ delete _tcpsocket;
+ }
+
+ if (_parsed_url) {
+ delete _parsed_url;
+ }
+
+ if (_response) {
+ delete _response;
+ }
+
+ // @todo: free DRBG_PERS ?
+ }
+
+ /**
+ * Execute the HTTPS request.
+ *
+ * @param[in] body Pointer to the request body
+ * @param[in] body_size Size of the request body
+ * @return An HttpResponse pointer on success, or NULL on failure.
+ * See get_error() for the error code.
+ */
+ HttpResponse* send(const void* body = NULL, nsapi_size_t body_size = 0) {
+ /* Initialize the flags */
+ /*
+ * 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 = ret;
+ return NULL;
+ }
+
+ if ((ret = mbedtls_x509_crt_parse(&_cacert, (const unsigned char *)_ssl_ca_pem,
+ strlen(_ssl_ca_pem) + 1)) != 0) {
+ print_mbedtls_error("mbedtls_x509_crt_parse", ret);
+ _error = ret;
+ return NULL;
+ }
+
+ 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 = ret;
+ return NULL;
+ }
+
+ mbedtls_ssl_conf_ca_chain(&_ssl_conf, &_cacert, NULL);
+ mbedtls_ssl_conf_rng(&_ssl_conf, mbedtls_ctr_drbg_random, &_ctr_drbg);
+
+ /* It is possible to disable authentication by passing
+ * MBEDTLS_SSL_VERIFY_NONE in the call to mbedtls_ssl_conf_authmode()
+ */
+ mbedtls_ssl_conf_authmode(&_ssl_conf, MBEDTLS_SSL_VERIFY_REQUIRED);
+
+#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 = ret;
+ return NULL;
+ }
+
+ mbedtls_ssl_set_hostname(&_ssl, _parsed_url->host());
+
+ mbedtls_ssl_set_bio(&_ssl, static_cast<void *>(_tcpsocket),
+ ssl_send, ssl_recv, NULL );
+
+ /* Connect to the server */
+ if (_debug) mbedtls_printf("Connecting to %s:%d\r\n", _parsed_url->host(), _parsed_url->port());
+ ret = _tcpsocket->connect(_parsed_url->host(), _parsed_url->port());
+ if (ret != NSAPI_ERROR_OK) {
+ if (_debug) mbedtls_printf("Failed to connect\r\n");
+ onError(_tcpsocket, -1);
+ return NULL;
+ }
+
+ /* Start the handshake, the rest will be done in onReceive() */
+ if (_debug) mbedtls_printf("Starting the TLS handshake...\r\n");
+ 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(_tcpsocket, -1);
+ }
+ else {
+ _error = ret;
+ }
+ return NULL;
+ }
+
+ char* request = _request_builder->build(body, body_size);
+ size_t request_size = strlen(request);
+
+ ret = mbedtls_ssl_write(&_ssl, (const unsigned char *) request, request_size);
+
+ free(request);
+
+ if (ret < 0) {
+ if (ret != MBEDTLS_ERR_SSL_WANT_READ &&
+ ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
+ print_mbedtls_error("mbedtls_ssl_write", ret);
+ onError(_tcpsocket, -1 );
+ }
+ else {
+ _error = ret;
+ }
+ return NULL;
+ }
+
+ /* It also means the handshake is done, time to print info */
+ if (_debug) mbedtls_printf("TLS connection to %s:%d established\r\n", _parsed_url->host(), _parsed_url->port());
+
+ const uint32_t buf_size = 1024;
+ char *buf = new char[buf_size];
+ mbedtls_x509_crt_info(buf, buf_size, "\r ",
+ mbedtls_ssl_get_peer_cert(&_ssl));
+ if (_debug) mbedtls_printf("Server certificate:\r\n%s\r", buf);
+
+ uint32_t flags = mbedtls_ssl_get_verify_result(&_ssl);
+ if( flags != 0 )
+ {
+ mbedtls_x509_crt_verify_info(buf, buf_size, "\r ! ", flags);
+ if (_debug) mbedtls_printf("Certificate verification failed:\r\n%s\r\r\n", buf);
+ }
+ else {
+ if (_debug) mbedtls_printf("Certificate verification passed\r\n\r\n");
+ }
+
+ // Create a response object
+ _response = new HttpResponse();
+ // And a response parser
+ HttpResponseParser parser(_response, _body_callback);
+
+ // Set up a receive buffer (on the heap)
+ uint8_t* recv_buffer = (uint8_t*)malloc(HTTP_RECEIVE_BUFFER_SIZE);
+
+ /* Read data out of the socket */
+ while ((ret = mbedtls_ssl_read(&_ssl, (unsigned char *) recv_buffer, HTTP_RECEIVE_BUFFER_SIZE)) > 0) {
+ // Don't know if this is actually needed, but OK
+ size_t _bpos = static_cast<size_t>(ret);
+ recv_buffer[_bpos] = 0;
+
+ size_t nparsed = parser.execute((const char*)recv_buffer, _bpos);
+ if (nparsed != _bpos) {
+ print_mbedtls_error("parser_error", nparsed);
+ // parser error...
+ _error = -2101;
+ free(recv_buffer);
+ return NULL;
+ }
+ // No more chunks? break out of this loop
+ if (_bpos < HTTP_RECEIVE_BUFFER_SIZE) {
+ break;
+ }
+ }
+ if (ret < 0) {
+ if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
+ print_mbedtls_error("mbedtls_ssl_read", ret);
+ onError(_tcpsocket, -1 );
+ }
+ else {
+ _error = ret;
+ }
+ free(recv_buffer);
+ return NULL;
+ }
+
+ parser.finish();
+
+ _tcpsocket->close();
+ free(recv_buffer);
+
+ return _response;
+ }
+
+ /**
+ * Closes the TCP socket
+ */
+ void close() {
+ _tcpsocket->close();
+ }
+
+ /**
+ * Set a header for the request.
+ *
+ * The 'Host' and 'Content-Length' headers are set automatically.
+ * Setting the same header twice will overwrite the previous entry.
+ *
+ * @param[in] key Header key
+ * @param[in] value Header value
+ */
+ void set_header(string key, string value) {
+ _request_builder->set_header(key, value);
+ }
+
+ /**
+ * Get the error code.
+ *
+ * When send() fails, this error is set.
+ */
+ nsapi_error_t get_error() {
+ return _error;
+ }
+
+ /**
+ * Set the debug flag.
+ *
+ * If this flag is set, debug information from mbed TLS will be logged to stdout.
+ */
+ void set_debug(bool debug) {
+ _debug = debug;
+ }
+
+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));
+ mbedtls_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 *file, int line,
+ const char *str)
+ {
+ const char *p, *basename;
+ (void) ctx;
+
+ /* Extract basename from file */
+ for(p = basename = file; *p != '\0'; p++) {
+ if(*p == '/' || *p == '\\') {
+ basename = p + 1;
+ }
+ }
+
+ if (_debug) {
+ mbedtls_printf("%s:%04d: |%d| %s", basename, line, level, 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, uint32_t *flags)
+ {
+ const uint32_t buf_size = 1024;
+ char *buf = new char[buf_size];
+ (void) data;
+
+ if (_debug) mbedtls_printf("\nVerifying certificate at depth %d:\n", depth);
+ mbedtls_x509_crt_info(buf, buf_size - 1, " ", crt);
+ if (_debug) mbedtls_printf("%s", buf);
+
+ if (*flags == 0)
+ if (_debug) mbedtls_printf("No verification issue for this certificate\n");
+ else
+ {
+ mbedtls_x509_crt_verify_info(buf, buf_size, " ! ", *flags);
+ if (_debug) mbedtls_printf("%s\n", buf);
+ }
+
+ delete[] buf;
+ return 0;
+ }
+#endif
+
+ /**
+ * Receive callback for mbed TLS
+ */
+ static int ssl_recv(void *ctx, unsigned char *buf, size_t len) {
+ int recv = -1;
+ TCPSocket *socket = static_cast<TCPSocket *>(ctx);
+ recv = socket->recv(buf, len);
+
+ if (NSAPI_ERROR_WOULD_BLOCK == recv) {
+ return MBEDTLS_ERR_SSL_WANT_READ;
+ }
+ else if (recv < 0) {
+ return -1;
+ }
+ else {
+ return recv;
+ }
+ }
+
+ /**
+ * Send callback for mbed TLS
+ */
+ static int ssl_send(void *ctx, const unsigned char *buf, size_t len) {
+ int size = -1;
+ TCPSocket *socket = static_cast<TCPSocket *>(ctx);
+ size = socket->send(buf, len);
+
+ if(NSAPI_ERROR_WOULD_BLOCK == size) {
+ return len;
+ }
+ else if (size < 0){
+ return -1;
+ }
+ else {
+ return size;
+ }
+ }
+
+ void onError(TCPSocket *s, int error) {
+ s->close();
+ _error = error;
+ }
+
+protected:
+ TCPSocket* _tcpsocket;
+
+ Callback<void(const char *at, size_t length)> _body_callback;
+ ParsedUrl* _parsed_url;
+ HttpRequestBuilder* _request_builder;
+ HttpResponse* _response;
+ const char *DRBG_PERS;
+ const char *_ssl_ca_pem;
+
+ nsapi_error_t _error;
+ bool _debug;
+
+ mbedtls_entropy_context _entropy;
+ mbedtls_ctr_drbg_context _ctr_drbg;
+ mbedtls_x509_crt _cacert;
+ mbedtls_ssl_context _ssl;
+ mbedtls_ssl_config _ssl_conf;
+};
+
+#endif // _MBED_HTTPS_REQUEST_H_