HTTP and HTTPS library for Mbed OS 5
Dependents: MQTTGateway2 MQTTGatewayK64 http-example-wnc GuardRoom ... more
For the example program, see: sandbox/http-example.
This library is used to make HTTP and HTTPS calls from Mbed OS 5 applications.
HTTP Request API
NetworkInterface* network = /* obtain a NetworkInterface object */ const char body[] = "{\"hello\":\"world\"}"; HttpRequest* request = new HttpRequest(network, HTTP_POST, "http://httpbin.org/post"); request->set_header("Content-Type", "application/json"); HttpResponse* response = request->send(body, strlen(body)); // if response is NULL, check response->get_error() printf("status is %d - %s\n", response->get_status_code(), response->get_status_message()); printf("body is:\n%s\n", response->get_body_as_string().c_str()); delete request; // also clears out the response
HTTPS Request API
// pass in the root certificates that you trust, there is no central CA registry in Mbed OS const char SSL_CA_PEM[] = "-----BEGIN CERTIFICATE-----\n" /* rest of the CA root certificates */; NetworkInterface* network = /* obtain a NetworkInterface object */ const char body[] = "{\"hello\":\"world\"}"; HttpsRequest* request = new HttpsRequest(network, SSL_CA_PEM, HTTP_GET "https://httpbin.org/status/418"); HttpResponse* response = request->send(); // if response is NULL, check response->get_error() printf("status is %d - %s\n", response->get_status_code(), response->get_status_message()); printf("body is:\n%s\n", response->get_body().c_str()); delete request;
Note: You can get the root CA for a domain easily from Firefox. Click on the green padlock, click More information > Security > View certificate > Details. Select the top entry in the 'Certificate Hierarchy' and click Export.... This gives you a PEM file. Add the content of the PEM file to your root CA list (here's an image).
Mbed TLS Entropy configuration
If your target does not have a built-in TRNG, or other entropy sources, add the following macros to your mbed_app.json
file to disable entropy:
{ "macros": [ "MBEDTLS_TEST_NULL_ENTROPY", "MBEDTLS_NO_DEFAULT_ENTROPY_SOURCES" ] }
Note that this is not secure, and you should not deploy this device into production with this configuration.
Memory usage
Small requests where the body of the response is cached by the library (like the one found in main-http.cpp), require 4K of RAM. When the request is finished they require 1.5K of RAM, depending on the size of the response. This applies both to HTTP and HTTPS. If you need to handle requests that return a large response body, see 'Dealing with large body'.
HTTPS requires additional memory: on FRDM-K64F about 50K of heap space (at its peak). This means that you cannot use HTTPS on devices with less than 128K of memory, asyou also need to reserve memory for the stack and network interface.
Dealing with large response body
By default the library will store the full request body on the heap. This works well for small responses, but you'll run out of memory when receiving a large response body. To mitigate this you can pass in a callback as the last argument to the request constructor. This callback will be called whenever a chunk of the body is received. You can set the request chunk size in the HTTP_RECEIVE_BUFFER_SIZE
macro (see mbed_lib.json
for the definition) although it also depends on the buffer size ofthe underlying network connection.
void body_callback(const char* data, uint32_t data_len) { // do something with the data } HttpRequest* req = new HttpRequest(network, HTTP_GET, "http://pathtolargefile.com", &body_callback); req->send(NULL, 0);
Dealing with a large request body
If you cannot load the full request into memory, you can pass a callback into the send
function. Through this callback you can feed in chunks of the request body. This is very useful if you want to send files from a file system.
const void * get_chunk(uint32_t* out_size) { // set the value of out_size (via *out_size = 10) to the size of the buffer // return the buffer // if you don't have any more data, set *out_size to 0 } HttpRequest* req = new HttpRequest(network, HTTP_POST, "http://my_api.com/upload"); req->send(callback(&get_chunk));
Socket re-use
By default the library opens a new socket per request. This is wasteful, especially when dealing with TLS requests. You can re-use sockets like this:
HTTP
TCPSocket* socket = new TCPSocket(); nsapi_error_t open_result = socket->open(network); // check open_result nsapi_error_t connect_result = socket->connect("httpbin.org", 80); // check connect_result // Pass in `socket`, instead of `network` as first argument HttpRequest* req = new HttpRequest(socket, HTTP_GET, "http://httpbin.org/status/418");
HTTPS
TLSSocket* socket = new TLSSocket(); nsapi_error_t r; // make sure to check the return values for the calls below (should return NSAPI_ERROR_OK) r = socket->open(network); r = socket->set_root_ca_cert(SSL_CA_PEM); r = socket->connect("httpbin.org", 443); // Pass in `socket`, instead of `network` as first argument, and omit the `SSL_CA_PEM` argument HttpsRequest* get_req = new HttpsRequest(socket, HTTP_GET, "https://httpbin.org/status/418");
Request logging
To make debugging easier you can log the raw request body that goes over the line. This also works with chunked encoding.
uint8_t *request_buffer = (uint8_t*)calloc(2048, 1); req->set_request_log_buffer(request_buffer, 2048); // after the request is done: printf("\n----- Request buffer -----\n"); for (size_t ix = 0; ix < req->get_request_log_buffer_length(); ix++) { printf("%02x ", request_buffer[ix]); } printf("\n");
Integration tests
Integration tests are located in the TESTS
folder and are ran through Greentea. Instructions on how to run the tests are in http-example.
Mbed OS 5.10 or lower
If you want to use this library on Mbed OS 5.10 or lower, you need to add the TLSSocket library to your project. This library is included in Mbed OS 5.11 and up.
Tested on
- K64F with Ethernet.
- NUCLEO_F411RE with ESP8266.
- ODIN-W2 with WiFi.
- K64F with Atmel 6LoWPAN shield.
- DISCO-L475VG-IOT01A with WiFi.
- Mbed Simulator.
source/tls_socket.h@27:42b319540a74, 2018-03-27 (annotated)
- Committer:
- Jan Jongboom
- Date:
- Tue Mar 27 11:05:43 2018 +0200
- Revision:
- 27:42b319540a74
- Parent:
- 18:f7a85895a941
Reference TCPSocket in tls_socket
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
Jan Jongboom |
13:992d953ecfb9 | 1 | /* |
Jan Jongboom |
13:992d953ecfb9 | 2 | * PackageLicenseDeclared: Apache-2.0 |
Jan Jongboom |
13:992d953ecfb9 | 3 | * Copyright (c) 2017 ARM Limited |
Jan Jongboom |
13:992d953ecfb9 | 4 | * |
Jan Jongboom |
13:992d953ecfb9 | 5 | * Licensed under the Apache License, Version 2.0 (the "License"); |
Jan Jongboom |
13:992d953ecfb9 | 6 | * you may not use this file except in compliance with the License. |
Jan Jongboom |
13:992d953ecfb9 | 7 | * You may obtain a copy of the License at |
Jan Jongboom |
13:992d953ecfb9 | 8 | * |
Jan Jongboom |
13:992d953ecfb9 | 9 | * http://www.apache.org/licenses/LICENSE-2.0 |
Jan Jongboom |
13:992d953ecfb9 | 10 | * |
Jan Jongboom |
13:992d953ecfb9 | 11 | * Unless required by applicable law or agreed to in writing, software |
Jan Jongboom |
13:992d953ecfb9 | 12 | * distributed under the License is distributed on an "AS IS" BASIS, |
Jan Jongboom |
13:992d953ecfb9 | 13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
Jan Jongboom |
13:992d953ecfb9 | 14 | * See the License for the specific language governing permissions and |
Jan Jongboom |
13:992d953ecfb9 | 15 | * limitations under the License. |
Jan Jongboom |
13:992d953ecfb9 | 16 | */ |
Jan Jongboom |
13:992d953ecfb9 | 17 | |
Jan Jongboom |
13:992d953ecfb9 | 18 | #ifndef _MBED_HTTPS_TLS_SOCKET_H_ |
Jan Jongboom |
13:992d953ecfb9 | 19 | #define _MBED_HTTPS_TLS_SOCKET_H_ |
Jan Jongboom |
13:992d953ecfb9 | 20 | |
Jan Jongboom |
13:992d953ecfb9 | 21 | /* Change to a number between 1 and 4 to debug the TLS connection */ |
Jan Jongboom |
13:992d953ecfb9 | 22 | #define DEBUG_LEVEL 0 |
Jan Jongboom |
13:992d953ecfb9 | 23 | |
Jan Jongboom |
13:992d953ecfb9 | 24 | #include <string> |
Jan Jongboom |
13:992d953ecfb9 | 25 | #include <vector> |
Jan Jongboom |
13:992d953ecfb9 | 26 | #include <map> |
Jan Jongboom |
27:42b319540a74 | 27 | #include "TCPSocket.h" |
Jan Jongboom |
13:992d953ecfb9 | 28 | #include "http_parser.h" |
Jan Jongboom |
13:992d953ecfb9 | 29 | #include "http_response.h" |
Jan Jongboom |
13:992d953ecfb9 | 30 | #include "http_request_builder.h" |
Jan Jongboom |
15:ffc77f212382 | 31 | #include "http_request_parser.h" |
Jan Jongboom |
13:992d953ecfb9 | 32 | #include "http_parsed_url.h" |
Jan Jongboom |
13:992d953ecfb9 | 33 | |
Jan Jongboom |
13:992d953ecfb9 | 34 | #include "mbedtls/platform.h" |
Jan Jongboom |
13:992d953ecfb9 | 35 | #include "mbedtls/ssl.h" |
Jan Jongboom |
13:992d953ecfb9 | 36 | #include "mbedtls/entropy.h" |
Jan Jongboom |
13:992d953ecfb9 | 37 | #include "mbedtls/ctr_drbg.h" |
Jan Jongboom |
13:992d953ecfb9 | 38 | #include "mbedtls/error.h" |
Jan Jongboom |
13:992d953ecfb9 | 39 | |
Jan Jongboom |
13:992d953ecfb9 | 40 | #if DEBUG_LEVEL > 0 |
Jan Jongboom |
13:992d953ecfb9 | 41 | #include "mbedtls/debug.h" |
Jan Jongboom |
13:992d953ecfb9 | 42 | #endif |
Jan Jongboom |
13:992d953ecfb9 | 43 | |
Jan Jongboom |
13:992d953ecfb9 | 44 | /** |
Jan Jongboom |
13:992d953ecfb9 | 45 | * \brief TLSSocket a wrapper around TCPSocket for interacting with TLS servers |
Jan Jongboom |
13:992d953ecfb9 | 46 | */ |
Jan Jongboom |
13:992d953ecfb9 | 47 | class TLSSocket { |
Jan Jongboom |
13:992d953ecfb9 | 48 | public: |
Jan Jongboom |
13:992d953ecfb9 | 49 | TLSSocket(NetworkInterface* net_iface, const char* hostname, uint16_t port, const char* ssl_ca_pem) { |
Jan Jongboom |
13:992d953ecfb9 | 50 | _tcpsocket = new TCPSocket(net_iface); |
Jan Jongboom |
13:992d953ecfb9 | 51 | _ssl_ca_pem = ssl_ca_pem; |
Jan Jongboom |
13:992d953ecfb9 | 52 | _is_connected = false; |
Jan Jongboom |
13:992d953ecfb9 | 53 | _debug = false; |
Jan Jongboom |
13:992d953ecfb9 | 54 | _hostname = hostname; |
Jan Jongboom |
13:992d953ecfb9 | 55 | _port = port; |
Jan Jongboom |
13:992d953ecfb9 | 56 | _error = 0; |
Jan Jongboom |
13:992d953ecfb9 | 57 | |
Jan Jongboom |
13:992d953ecfb9 | 58 | DRBG_PERS = "mbed TLS helloword client"; |
Jan Jongboom |
13:992d953ecfb9 | 59 | |
Jan Jongboom |
13:992d953ecfb9 | 60 | mbedtls_entropy_init(&_entropy); |
Jan Jongboom |
13:992d953ecfb9 | 61 | mbedtls_ctr_drbg_init(&_ctr_drbg); |
Jan Jongboom |
13:992d953ecfb9 | 62 | mbedtls_x509_crt_init(&_cacert); |
Jan Jongboom |
13:992d953ecfb9 | 63 | mbedtls_ssl_init(&_ssl); |
Jan Jongboom |
13:992d953ecfb9 | 64 | mbedtls_ssl_config_init(&_ssl_conf); |
Jan Jongboom |
13:992d953ecfb9 | 65 | } |
Jan Jongboom |
13:992d953ecfb9 | 66 | |
Jan Jongboom |
13:992d953ecfb9 | 67 | ~TLSSocket() { |
Jan Jongboom |
13:992d953ecfb9 | 68 | mbedtls_entropy_free(&_entropy); |
Jan Jongboom |
13:992d953ecfb9 | 69 | mbedtls_ctr_drbg_free(&_ctr_drbg); |
Jan Jongboom |
13:992d953ecfb9 | 70 | mbedtls_x509_crt_free(&_cacert); |
Jan Jongboom |
13:992d953ecfb9 | 71 | mbedtls_ssl_free(&_ssl); |
Jan Jongboom |
13:992d953ecfb9 | 72 | mbedtls_ssl_config_free(&_ssl_conf); |
Jan Jongboom |
13:992d953ecfb9 | 73 | |
Jan Jongboom |
13:992d953ecfb9 | 74 | if (_tcpsocket) { |
Jan Jongboom |
13:992d953ecfb9 | 75 | _tcpsocket->close(); |
Jan Jongboom |
13:992d953ecfb9 | 76 | delete _tcpsocket; |
Jan Jongboom |
13:992d953ecfb9 | 77 | } |
Jan Jongboom |
13:992d953ecfb9 | 78 | |
Jan Jongboom |
13:992d953ecfb9 | 79 | // @todo: free DRBG_PERS ? |
Jan Jongboom |
13:992d953ecfb9 | 80 | } |
Jan Jongboom |
13:992d953ecfb9 | 81 | |
Jan Jongboom |
13:992d953ecfb9 | 82 | nsapi_error_t connect() { |
Jan Jongboom |
13:992d953ecfb9 | 83 | /* Initialize the flags */ |
Jan Jongboom |
13:992d953ecfb9 | 84 | /* |
Jan Jongboom |
13:992d953ecfb9 | 85 | * Initialize TLS-related stuf. |
Jan Jongboom |
13:992d953ecfb9 | 86 | */ |
Jan Jongboom |
13:992d953ecfb9 | 87 | int ret; |
Jan Jongboom |
13:992d953ecfb9 | 88 | if ((ret = mbedtls_ctr_drbg_seed(&_ctr_drbg, mbedtls_entropy_func, &_entropy, |
Jan Jongboom |
13:992d953ecfb9 | 89 | (const unsigned char *) DRBG_PERS, |
Jan Jongboom |
13:992d953ecfb9 | 90 | sizeof (DRBG_PERS))) != 0) { |
Jan Jongboom |
13:992d953ecfb9 | 91 | print_mbedtls_error("mbedtls_crt_drbg_init", ret); |
Jan Jongboom |
13:992d953ecfb9 | 92 | _error = ret; |
Jan Jongboom |
13:992d953ecfb9 | 93 | return _error; |
Jan Jongboom |
13:992d953ecfb9 | 94 | } |
Jan Jongboom |
13:992d953ecfb9 | 95 | |
Jan Jongboom |
13:992d953ecfb9 | 96 | if ((ret = mbedtls_x509_crt_parse(&_cacert, (const unsigned char *)_ssl_ca_pem, |
Jan Jongboom |
13:992d953ecfb9 | 97 | strlen(_ssl_ca_pem) + 1)) != 0) { |
Jan Jongboom |
13:992d953ecfb9 | 98 | print_mbedtls_error("mbedtls_x509_crt_parse", ret); |
Jan Jongboom |
13:992d953ecfb9 | 99 | _error = ret; |
Jan Jongboom |
13:992d953ecfb9 | 100 | return _error; |
Jan Jongboom |
13:992d953ecfb9 | 101 | } |
Jan Jongboom |
13:992d953ecfb9 | 102 | |
Jan Jongboom |
13:992d953ecfb9 | 103 | if ((ret = mbedtls_ssl_config_defaults(&_ssl_conf, |
Jan Jongboom |
13:992d953ecfb9 | 104 | MBEDTLS_SSL_IS_CLIENT, |
Jan Jongboom |
13:992d953ecfb9 | 105 | MBEDTLS_SSL_TRANSPORT_STREAM, |
Jan Jongboom |
13:992d953ecfb9 | 106 | MBEDTLS_SSL_PRESET_DEFAULT)) != 0) { |
Jan Jongboom |
13:992d953ecfb9 | 107 | print_mbedtls_error("mbedtls_ssl_config_defaults", ret); |
Jan Jongboom |
13:992d953ecfb9 | 108 | _error = ret; |
Jan Jongboom |
13:992d953ecfb9 | 109 | return _error; |
Jan Jongboom |
13:992d953ecfb9 | 110 | } |
Jan Jongboom |
13:992d953ecfb9 | 111 | |
Jan Jongboom |
13:992d953ecfb9 | 112 | mbedtls_ssl_conf_ca_chain(&_ssl_conf, &_cacert, NULL); |
Jan Jongboom |
13:992d953ecfb9 | 113 | mbedtls_ssl_conf_rng(&_ssl_conf, mbedtls_ctr_drbg_random, &_ctr_drbg); |
Jan Jongboom |
13:992d953ecfb9 | 114 | |
Jan Jongboom |
13:992d953ecfb9 | 115 | /* It is possible to disable authentication by passing |
Jan Jongboom |
13:992d953ecfb9 | 116 | * MBEDTLS_SSL_VERIFY_NONE in the call to mbedtls_ssl_conf_authmode() |
Jan Jongboom |
13:992d953ecfb9 | 117 | */ |
Jan Jongboom |
13:992d953ecfb9 | 118 | mbedtls_ssl_conf_authmode(&_ssl_conf, MBEDTLS_SSL_VERIFY_REQUIRED); |
Jan Jongboom |
13:992d953ecfb9 | 119 | |
Jan Jongboom |
13:992d953ecfb9 | 120 | #if DEBUG_LEVEL > 0 |
Jan Jongboom |
13:992d953ecfb9 | 121 | mbedtls_ssl_conf_verify(&_ssl_conf, my_verify, NULL); |
Jan Jongboom |
13:992d953ecfb9 | 122 | mbedtls_ssl_conf_dbg(&_ssl_conf, my_debug, NULL); |
Jan Jongboom |
13:992d953ecfb9 | 123 | mbedtls_debug_set_threshold(DEBUG_LEVEL); |
Jan Jongboom |
13:992d953ecfb9 | 124 | #endif |
Jan Jongboom |
13:992d953ecfb9 | 125 | |
Jan Jongboom |
13:992d953ecfb9 | 126 | if ((ret = mbedtls_ssl_setup(&_ssl, &_ssl_conf)) != 0) { |
Jan Jongboom |
13:992d953ecfb9 | 127 | print_mbedtls_error("mbedtls_ssl_setup", ret); |
Jan Jongboom |
13:992d953ecfb9 | 128 | _error = ret; |
Jan Jongboom |
13:992d953ecfb9 | 129 | return _error; |
Jan Jongboom |
13:992d953ecfb9 | 130 | } |
Jan Jongboom |
13:992d953ecfb9 | 131 | |
Jan Jongboom |
13:992d953ecfb9 | 132 | mbedtls_ssl_set_hostname(&_ssl, _hostname); |
Jan Jongboom |
13:992d953ecfb9 | 133 | |
Jan Jongboom |
13:992d953ecfb9 | 134 | mbedtls_ssl_set_bio(&_ssl, static_cast<void *>(_tcpsocket), |
Jan Jongboom |
13:992d953ecfb9 | 135 | ssl_send, ssl_recv, NULL ); |
Jan Jongboom |
13:992d953ecfb9 | 136 | |
Jan Jongboom |
13:992d953ecfb9 | 137 | /* Connect to the server */ |
Jan Jongboom |
13:992d953ecfb9 | 138 | if (_debug) mbedtls_printf("Connecting to %s:%d\r\n", _hostname, _port); |
Jan Jongboom |
13:992d953ecfb9 | 139 | ret = _tcpsocket->connect(_hostname, _port); |
Jan Jongboom |
13:992d953ecfb9 | 140 | if (ret != NSAPI_ERROR_OK) { |
Jan Jongboom |
13:992d953ecfb9 | 141 | if (_debug) mbedtls_printf("Failed to connect\r\n"); |
Jan Jongboom |
13:992d953ecfb9 | 142 | onError(_tcpsocket, -1); |
Jan Jongboom |
13:992d953ecfb9 | 143 | return _error; |
Jan Jongboom |
13:992d953ecfb9 | 144 | } |
Jan Jongboom |
13:992d953ecfb9 | 145 | |
Jan Jongboom |
13:992d953ecfb9 | 146 | /* Start the handshake, the rest will be done in onReceive() */ |
Jan Jongboom |
13:992d953ecfb9 | 147 | if (_debug) mbedtls_printf("Starting the TLS handshake...\r\n"); |
Jan Jongboom |
13:992d953ecfb9 | 148 | ret = mbedtls_ssl_handshake(&_ssl); |
Jan Jongboom |
13:992d953ecfb9 | 149 | if (ret < 0) { |
Jan Jongboom |
13:992d953ecfb9 | 150 | if (ret != MBEDTLS_ERR_SSL_WANT_READ && |
Jan Jongboom |
13:992d953ecfb9 | 151 | ret != MBEDTLS_ERR_SSL_WANT_WRITE) { |
Jan Jongboom |
13:992d953ecfb9 | 152 | print_mbedtls_error("mbedtls_ssl_handshake", ret); |
Jan Jongboom |
13:992d953ecfb9 | 153 | onError(_tcpsocket, -1); |
Jan Jongboom |
13:992d953ecfb9 | 154 | } |
Jan Jongboom |
13:992d953ecfb9 | 155 | else { |
Jan Jongboom |
13:992d953ecfb9 | 156 | _error = ret; |
Jan Jongboom |
13:992d953ecfb9 | 157 | } |
Jan Jongboom |
13:992d953ecfb9 | 158 | return _error; |
Jan Jongboom |
13:992d953ecfb9 | 159 | } |
Jan Jongboom |
13:992d953ecfb9 | 160 | |
Jan Jongboom |
13:992d953ecfb9 | 161 | /* It also means the handshake is done, time to print info */ |
Jan Jongboom |
13:992d953ecfb9 | 162 | if (_debug) mbedtls_printf("TLS connection to %s:%d established\r\n", _hostname, _port); |
Jan Jongboom |
13:992d953ecfb9 | 163 | |
Jan Jongboom |
13:992d953ecfb9 | 164 | const uint32_t buf_size = 1024; |
Jan Jongboom |
18:f7a85895a941 | 165 | char buf[buf_size] = { 0 }; |
Jan Jongboom |
13:992d953ecfb9 | 166 | mbedtls_x509_crt_info(buf, buf_size, "\r ", |
Jan Jongboom |
13:992d953ecfb9 | 167 | mbedtls_ssl_get_peer_cert(&_ssl)); |
Jan Jongboom |
13:992d953ecfb9 | 168 | if (_debug) mbedtls_printf("Server certificate:\r\n%s\r", buf); |
Jan Jongboom |
13:992d953ecfb9 | 169 | |
Jan Jongboom |
13:992d953ecfb9 | 170 | uint32_t flags = mbedtls_ssl_get_verify_result(&_ssl); |
Jan Jongboom |
13:992d953ecfb9 | 171 | if( flags != 0 ) |
Jan Jongboom |
13:992d953ecfb9 | 172 | { |
Jan Jongboom |
13:992d953ecfb9 | 173 | mbedtls_x509_crt_verify_info(buf, buf_size, "\r ! ", flags); |
Jan Jongboom |
13:992d953ecfb9 | 174 | if (_debug) mbedtls_printf("Certificate verification failed:\r\n%s\r\r\n", buf); |
Jan Jongboom |
13:992d953ecfb9 | 175 | } |
Jan Jongboom |
13:992d953ecfb9 | 176 | else { |
Jan Jongboom |
13:992d953ecfb9 | 177 | if (_debug) mbedtls_printf("Certificate verification passed\r\n\r\n"); |
Jan Jongboom |
13:992d953ecfb9 | 178 | } |
Jan Jongboom |
13:992d953ecfb9 | 179 | |
Jan Jongboom |
13:992d953ecfb9 | 180 | _is_connected = true; |
Jan Jongboom |
13:992d953ecfb9 | 181 | |
Jan Jongboom |
13:992d953ecfb9 | 182 | return 0; |
Jan Jongboom |
13:992d953ecfb9 | 183 | } |
Jan Jongboom |
13:992d953ecfb9 | 184 | |
Jan Jongboom |
13:992d953ecfb9 | 185 | bool connected() { |
Jan Jongboom |
13:992d953ecfb9 | 186 | return _is_connected; |
Jan Jongboom |
13:992d953ecfb9 | 187 | } |
Jan Jongboom |
13:992d953ecfb9 | 188 | |
Jan Jongboom |
13:992d953ecfb9 | 189 | nsapi_error_t error() { |
Jan Jongboom |
13:992d953ecfb9 | 190 | return _error; |
Jan Jongboom |
13:992d953ecfb9 | 191 | } |
Jan Jongboom |
13:992d953ecfb9 | 192 | |
Jan Jongboom |
13:992d953ecfb9 | 193 | TCPSocket* get_tcp_socket() { |
Jan Jongboom |
13:992d953ecfb9 | 194 | return _tcpsocket; |
Jan Jongboom |
13:992d953ecfb9 | 195 | } |
Jan Jongboom |
13:992d953ecfb9 | 196 | |
Jan Jongboom |
13:992d953ecfb9 | 197 | mbedtls_ssl_context* get_ssl_context() { |
Jan Jongboom |
13:992d953ecfb9 | 198 | return &_ssl; |
Jan Jongboom |
13:992d953ecfb9 | 199 | } |
Jan Jongboom |
13:992d953ecfb9 | 200 | |
Jan Jongboom |
13:992d953ecfb9 | 201 | /** |
Jan Jongboom |
13:992d953ecfb9 | 202 | * Set the debug flag. |
Jan Jongboom |
13:992d953ecfb9 | 203 | * |
Jan Jongboom |
13:992d953ecfb9 | 204 | * If this flag is set, debug information from mbed TLS will be logged to stdout. |
Jan Jongboom |
13:992d953ecfb9 | 205 | */ |
Jan Jongboom |
13:992d953ecfb9 | 206 | void set_debug(bool debug) { |
Jan Jongboom |
13:992d953ecfb9 | 207 | _debug = debug; |
Jan Jongboom |
13:992d953ecfb9 | 208 | } |
Jan Jongboom |
13:992d953ecfb9 | 209 | |
Jan Jongboom |
13:992d953ecfb9 | 210 | protected: |
Jan Jongboom |
13:992d953ecfb9 | 211 | /** |
Jan Jongboom |
13:992d953ecfb9 | 212 | * Helper for pretty-printing mbed TLS error codes |
Jan Jongboom |
13:992d953ecfb9 | 213 | */ |
Jan Jongboom |
13:992d953ecfb9 | 214 | static void print_mbedtls_error(const char *name, int err) { |
Jan Jongboom |
13:992d953ecfb9 | 215 | char buf[128]; |
Jan Jongboom |
13:992d953ecfb9 | 216 | mbedtls_strerror(err, buf, sizeof (buf)); |
Jan Jongboom |
13:992d953ecfb9 | 217 | mbedtls_printf("%s() failed: -0x%04x (%d): %s\r\n", name, -err, err, buf); |
Jan Jongboom |
13:992d953ecfb9 | 218 | } |
Jan Jongboom |
13:992d953ecfb9 | 219 | |
Jan Jongboom |
13:992d953ecfb9 | 220 | #if DEBUG_LEVEL > 0 |
Jan Jongboom |
13:992d953ecfb9 | 221 | /** |
Jan Jongboom |
13:992d953ecfb9 | 222 | * Debug callback for mbed TLS |
Jan Jongboom |
13:992d953ecfb9 | 223 | * Just prints on the USB serial port |
Jan Jongboom |
13:992d953ecfb9 | 224 | */ |
Jan Jongboom |
13:992d953ecfb9 | 225 | static void my_debug(void *ctx, int level, const char *file, int line, |
Jan Jongboom |
13:992d953ecfb9 | 226 | const char *str) |
Jan Jongboom |
13:992d953ecfb9 | 227 | { |
Jan Jongboom |
13:992d953ecfb9 | 228 | const char *p, *basename; |
Jan Jongboom |
13:992d953ecfb9 | 229 | (void) ctx; |
Jan Jongboom |
13:992d953ecfb9 | 230 | |
Jan Jongboom |
13:992d953ecfb9 | 231 | /* Extract basename from file */ |
Jan Jongboom |
13:992d953ecfb9 | 232 | for(p = basename = file; *p != '\0'; p++) { |
Jan Jongboom |
13:992d953ecfb9 | 233 | if(*p == '/' || *p == '\\') { |
Jan Jongboom |
13:992d953ecfb9 | 234 | basename = p + 1; |
Jan Jongboom |
13:992d953ecfb9 | 235 | } |
Jan Jongboom |
13:992d953ecfb9 | 236 | } |
Jan Jongboom |
13:992d953ecfb9 | 237 | |
Jan Jongboom |
13:992d953ecfb9 | 238 | if (_debug) { |
Jan Jongboom |
13:992d953ecfb9 | 239 | mbedtls_printf("%s:%04d: |%d| %s", basename, line, level, str); |
Jan Jongboom |
13:992d953ecfb9 | 240 | } |
Jan Jongboom |
13:992d953ecfb9 | 241 | } |
Jan Jongboom |
13:992d953ecfb9 | 242 | |
Jan Jongboom |
13:992d953ecfb9 | 243 | /** |
Jan Jongboom |
13:992d953ecfb9 | 244 | * Certificate verification callback for mbed TLS |
Jan Jongboom |
13:992d953ecfb9 | 245 | * Here we only use it to display information on each cert in the chain |
Jan Jongboom |
13:992d953ecfb9 | 246 | */ |
Jan Jongboom |
13:992d953ecfb9 | 247 | static int my_verify(void *data, mbedtls_x509_crt *crt, int depth, uint32_t *flags) |
Jan Jongboom |
13:992d953ecfb9 | 248 | { |
Jan Jongboom |
13:992d953ecfb9 | 249 | const uint32_t buf_size = 1024; |
Jan Jongboom |
13:992d953ecfb9 | 250 | char *buf = new char[buf_size]; |
Jan Jongboom |
13:992d953ecfb9 | 251 | (void) data; |
Jan Jongboom |
13:992d953ecfb9 | 252 | |
Jan Jongboom |
13:992d953ecfb9 | 253 | if (_debug) mbedtls_printf("\nVerifying certificate at depth %d:\n", depth); |
Jan Jongboom |
13:992d953ecfb9 | 254 | mbedtls_x509_crt_info(buf, buf_size - 1, " ", crt); |
Jan Jongboom |
13:992d953ecfb9 | 255 | if (_debug) mbedtls_printf("%s", buf); |
Jan Jongboom |
13:992d953ecfb9 | 256 | |
Jan Jongboom |
13:992d953ecfb9 | 257 | if (*flags == 0) |
Jan Jongboom |
13:992d953ecfb9 | 258 | if (_debug) mbedtls_printf("No verification issue for this certificate\n"); |
Jan Jongboom |
13:992d953ecfb9 | 259 | else |
Jan Jongboom |
13:992d953ecfb9 | 260 | { |
Jan Jongboom |
13:992d953ecfb9 | 261 | mbedtls_x509_crt_verify_info(buf, buf_size, " ! ", *flags); |
Jan Jongboom |
13:992d953ecfb9 | 262 | if (_debug) mbedtls_printf("%s\n", buf); |
Jan Jongboom |
13:992d953ecfb9 | 263 | } |
Jan Jongboom |
13:992d953ecfb9 | 264 | |
Jan Jongboom |
13:992d953ecfb9 | 265 | delete[] buf; |
Jan Jongboom |
13:992d953ecfb9 | 266 | return 0; |
Jan Jongboom |
13:992d953ecfb9 | 267 | } |
Jan Jongboom |
13:992d953ecfb9 | 268 | #endif |
Jan Jongboom |
13:992d953ecfb9 | 269 | |
Jan Jongboom |
13:992d953ecfb9 | 270 | /** |
Jan Jongboom |
13:992d953ecfb9 | 271 | * Receive callback for mbed TLS |
Jan Jongboom |
13:992d953ecfb9 | 272 | */ |
Jan Jongboom |
13:992d953ecfb9 | 273 | static int ssl_recv(void *ctx, unsigned char *buf, size_t len) { |
Jan Jongboom |
13:992d953ecfb9 | 274 | int recv = -1; |
Jan Jongboom |
13:992d953ecfb9 | 275 | TCPSocket *socket = static_cast<TCPSocket *>(ctx); |
Jan Jongboom |
13:992d953ecfb9 | 276 | recv = socket->recv(buf, len); |
Jan Jongboom |
13:992d953ecfb9 | 277 | |
Jan Jongboom |
13:992d953ecfb9 | 278 | if (NSAPI_ERROR_WOULD_BLOCK == recv) { |
Jan Jongboom |
13:992d953ecfb9 | 279 | return MBEDTLS_ERR_SSL_WANT_READ; |
Jan Jongboom |
13:992d953ecfb9 | 280 | } |
Jan Jongboom |
13:992d953ecfb9 | 281 | else if (recv < 0) { |
Jan Jongboom |
13:992d953ecfb9 | 282 | return -1; |
Jan Jongboom |
13:992d953ecfb9 | 283 | } |
Jan Jongboom |
13:992d953ecfb9 | 284 | else { |
Jan Jongboom |
13:992d953ecfb9 | 285 | return recv; |
Jan Jongboom |
13:992d953ecfb9 | 286 | } |
Jan Jongboom |
13:992d953ecfb9 | 287 | } |
Jan Jongboom |
13:992d953ecfb9 | 288 | |
Jan Jongboom |
13:992d953ecfb9 | 289 | /** |
Jan Jongboom |
13:992d953ecfb9 | 290 | * Send callback for mbed TLS |
Jan Jongboom |
13:992d953ecfb9 | 291 | */ |
Jan Jongboom |
13:992d953ecfb9 | 292 | static int ssl_send(void *ctx, const unsigned char *buf, size_t len) { |
Jan Jongboom |
13:992d953ecfb9 | 293 | int size = -1; |
Jan Jongboom |
13:992d953ecfb9 | 294 | TCPSocket *socket = static_cast<TCPSocket *>(ctx); |
Jan Jongboom |
13:992d953ecfb9 | 295 | size = socket->send(buf, len); |
Jan Jongboom |
13:992d953ecfb9 | 296 | |
Jan Jongboom |
13:992d953ecfb9 | 297 | if(NSAPI_ERROR_WOULD_BLOCK == size) { |
Jan Jongboom |
13:992d953ecfb9 | 298 | return len; |
Jan Jongboom |
13:992d953ecfb9 | 299 | } |
Jan Jongboom |
13:992d953ecfb9 | 300 | else if (size < 0){ |
Jan Jongboom |
13:992d953ecfb9 | 301 | return -1; |
Jan Jongboom |
13:992d953ecfb9 | 302 | } |
Jan Jongboom |
13:992d953ecfb9 | 303 | else { |
Jan Jongboom |
13:992d953ecfb9 | 304 | return size; |
Jan Jongboom |
13:992d953ecfb9 | 305 | } |
Jan Jongboom |
13:992d953ecfb9 | 306 | } |
Jan Jongboom |
13:992d953ecfb9 | 307 | |
Jan Jongboom |
13:992d953ecfb9 | 308 | private: |
Jan Jongboom |
13:992d953ecfb9 | 309 | void onError(TCPSocket *s, int error) { |
Jan Jongboom |
13:992d953ecfb9 | 310 | s->close(); |
Jan Jongboom |
13:992d953ecfb9 | 311 | _error = error; |
Jan Jongboom |
13:992d953ecfb9 | 312 | } |
Jan Jongboom |
13:992d953ecfb9 | 313 | |
Jan Jongboom |
13:992d953ecfb9 | 314 | TCPSocket* _tcpsocket; |
Jan Jongboom |
13:992d953ecfb9 | 315 | |
Jan Jongboom |
13:992d953ecfb9 | 316 | const char* DRBG_PERS; |
Jan Jongboom |
13:992d953ecfb9 | 317 | const char* _ssl_ca_pem; |
Jan Jongboom |
13:992d953ecfb9 | 318 | const char* _hostname; |
Jan Jongboom |
13:992d953ecfb9 | 319 | uint16_t _port; |
Jan Jongboom |
13:992d953ecfb9 | 320 | |
Jan Jongboom |
13:992d953ecfb9 | 321 | bool _debug; |
Jan Jongboom |
13:992d953ecfb9 | 322 | bool _is_connected; |
Jan Jongboom |
13:992d953ecfb9 | 323 | |
Jan Jongboom |
13:992d953ecfb9 | 324 | nsapi_error_t _error; |
Jan Jongboom |
13:992d953ecfb9 | 325 | |
Jan Jongboom |
13:992d953ecfb9 | 326 | mbedtls_entropy_context _entropy; |
Jan Jongboom |
13:992d953ecfb9 | 327 | mbedtls_ctr_drbg_context _ctr_drbg; |
Jan Jongboom |
13:992d953ecfb9 | 328 | mbedtls_x509_crt _cacert; |
Jan Jongboom |
13:992d953ecfb9 | 329 | mbedtls_ssl_context _ssl; |
Jan Jongboom |
13:992d953ecfb9 | 330 | mbedtls_ssl_config _ssl_conf; |
Jan Jongboom |
13:992d953ecfb9 | 331 | }; |
Jan Jongboom |
13:992d953ecfb9 | 332 | |
Jan Jongboom |
13:992d953ecfb9 | 333 | #endif // _MBED_HTTPS_TLS_SOCKET_H_ |