Support self signed certificates (#291)
* Support self signed certificates Fix for https://github.com/espressif/arduino-esp32/issues/265 mbedtls_ssl_conf_authmode was defined before mbedtls_ssl_config_defaults causing several bugs when no CA certificate is defined. * Implement Arduino's log facility Replace printf by ESP log handling * Remove \n from debug messages log_ doesn't need \n to break line.
This commit is contained in:
copercini
Me No Dev
parent
fcbb3e7987
commit
b46f1e2e3c
@ -1,118 +1,55 @@
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/* Provide SSL/TLS functions to ESP32 with Arduino IDE
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*
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* Adapted from the ssl_client1 example in mbedtls.
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* Adapted from the ssl_client1 example of mbedtls.
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*
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* Original Copyright (C) 2006-2015, ARM Limited, All Rights Reserved, Apache 2.0 License.
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* Additions Copyright (C) 2017 Evandro Luis Copercini, Apache 2.0 License.
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*/
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#include "Arduino.h"
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#include <esp32-hal-log.h>
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#include <lwip/sockets.h>
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#include <lwip/err.h>
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#include <lwip/sockets.h>
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#include <lwip/sys.h>
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#include <lwip/netdb.h>
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#include "ssl_client.h"
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const char *pers = "esp32-tls";
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#define DEBUG //Comment to supress debug messages
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#ifdef DEBUG
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#define DEBUG_PRINT(...) printf( __VA_ARGS__ )
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#else
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#define DEBUG_PRINT(x)
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#endif
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#ifdef CONFIG_MBEDTLS_DEBUG
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#define MBEDTLS_DEBUG_LEVEL 4
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/* mbedtls debug function that translates mbedTLS debug output
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to ESP_LOGx debug output.
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MBEDTLS_DEBUG_LEVEL 4 means all mbedTLS debug output gets sent here,
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and then filtered to the ESP logging mechanism.
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*/
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static void mbedtls_debug(void *ctx, int level,
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const char *file, int line,
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const char *str)
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{
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const char *MBTAG = "mbedtls";
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char *file_sep;
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/* Shorten 'file' from the whole file path to just the filename
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This is a bit wasteful because the macros are compiled in with
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the full _FILE_ path in each case.
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*/
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file_sep = rindex(file, '/');
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if (file_sep) {
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file = file_sep + 1;
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}
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switch (level) {
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case 1:
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printf( "%s:%d %s \n", file, line, str);
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break;
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case 2:
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case 3:
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printf( "%s:%d %s \n", file, line, str);
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case 4:
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printf( "%s:%d %s \n", file, line, str);
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break;
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default:
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printf( "Unexpected log level %d: %s \n", level, str);
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break;
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}
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}
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#endif
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static int handle_error(int err)
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{
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#ifdef MBEDTLS_ERROR_C
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char error_buf[100];
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mbedtls_strerror(err, error_buf, 100);
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printf("\n%s\n", error_buf);
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log_e("%s", error_buf);
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#endif
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printf("\nMbedTLS message code: %d\n", err);
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log_e("MbedTLS message code: %d", err);
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return err;
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}
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void ssl_init(sslclient_context *ssl_client)
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{
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/*
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* Initialize the RNG and the session data
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*/
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mbedtls_ssl_init(&ssl_client->ssl_ctx);
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mbedtls_ssl_config_init(&ssl_client->ssl_conf);
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mbedtls_ctr_drbg_init(&ssl_client->drbg_ctx);
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}
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int start_ssl_client(sslclient_context *ssl_client, uint32_t ipAddress, uint32_t port, const char *rootCABuff, const char *cli_cert, const char *cli_key)
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{
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char buf[512];
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int ret, flags, len, timeout;
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int enable = 1;
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DEBUG_PRINT("Free heap before TLS %u\n", xPortGetFreeHeapSize());
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log_i("Free heap before TLS %u", xPortGetFreeHeapSize());
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log_i("Starting socket");
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ssl_client->socket = -1;
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ssl_client->socket = lwip_socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
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if (ssl_client->socket < 0) {
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printf("\r\nERROR opening socket\r\n");
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log_e("ERROR opening socket");
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return ssl_client->socket;
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}
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@ -129,33 +66,35 @@ int start_ssl_client(sslclient_context *ssl_client, uint32_t ipAddress, uint32_t
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lwip_setsockopt(ssl_client->socket, IPPROTO_TCP, TCP_NODELAY, &enable, sizeof(enable));
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lwip_setsockopt(ssl_client->socket, SOL_SOCKET, SO_KEEPALIVE, &enable, sizeof(enable));
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} else {
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printf("\r\nConnect to Server failed!\r\n");
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log_e("Connect to Server failed!");
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return -1;
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}
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fcntl( ssl_client->socket, F_SETFL, fcntl( ssl_client->socket, F_GETFL, 0 ) | O_NONBLOCK );
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DEBUG_PRINT( "Seeding the random number generator\n");
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log_i("Seeding the random number generator");
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mbedtls_entropy_init(&ssl_client->entropy_ctx);
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ret = mbedtls_ctr_drbg_seed(&ssl_client->drbg_ctx, mbedtls_entropy_func,
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&ssl_client->entropy_ctx, (const unsigned char *) pers, strlen(pers));
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if (ret < 0) {
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return handle_error(ret);
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}
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log_i("Setting up the SSL/TLS structure...");
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if ((ret = mbedtls_ssl_config_defaults(&ssl_client->ssl_conf,
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MBEDTLS_SSL_IS_CLIENT,
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MBEDTLS_SSL_TRANSPORT_STREAM,
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MBEDTLS_SSL_PRESET_DEFAULT)) != 0) {
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return handle_error(ret);
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}
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/* MBEDTLS_SSL_VERIFY_REQUIRED if a CA certificate is defined on Arduino IDE and
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MBEDTLS_SSL_VERIFY_NONE if not.
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*/
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if (rootCABuff != NULL) {
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DEBUG_PRINT( "Loading CA cert\n");
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log_i("Loading CA cert");
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mbedtls_x509_crt_init(&ssl_client->ca_cert);
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mbedtls_ssl_conf_authmode(&ssl_client->ssl_conf, MBEDTLS_SSL_VERIFY_REQUIRED);
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ret = mbedtls_x509_crt_parse(&ssl_client->ca_cert, (const unsigned char *)rootCABuff, strlen(rootCABuff) + 1);
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@ -163,36 +102,26 @@ int start_ssl_client(sslclient_context *ssl_client, uint32_t ipAddress, uint32_t
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//mbedtls_ssl_conf_verify(&ssl_client->ssl_ctx, my_verify, NULL );
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if (ret < 0) {
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return handle_error(ret);
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}
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} else {
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mbedtls_ssl_conf_authmode(&ssl_client->ssl_conf, MBEDTLS_SSL_VERIFY_NONE);
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log_i("WARNING: Use certificates for a more secure communication!");
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}
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if (cli_cert != NULL && cli_key != NULL) {
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mbedtls_x509_crt_init(&ssl_client->client_cert);
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mbedtls_pk_init(&ssl_client->client_key);
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DEBUG_PRINT( "Loading CRT cert\n");
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log_i("Loading CRT cert");
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ret = mbedtls_x509_crt_parse(&ssl_client->client_cert, (const unsigned char *)cli_cert, strlen(cli_cert) + 1);
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if (ret < 0) {
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return handle_error(ret);
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}
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DEBUG_PRINT( "Loading private key\n");
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log_i("Loading private key");
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ret = mbedtls_pk_parse_key(&ssl_client->client_key, (const unsigned char *)cli_key, strlen(cli_key) + 1, NULL, 0);
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if (ret != 0) {
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return handle_error(ret);
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}
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@ -203,7 +132,7 @@ int start_ssl_client(sslclient_context *ssl_client, uint32_t ipAddress, uint32_t
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/*
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// TODO: implement match CN verification
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DEBUG_PRINT( "Setting hostname for TLS session...\n");
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log_i("Setting hostname for TLS session...");
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// Hostname set here should match CN in server certificate
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if((ret = mbedtls_ssl_set_hostname(&ssl_client->ssl_ctx, host)) != 0)
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@ -211,40 +140,21 @@ int start_ssl_client(sslclient_context *ssl_client, uint32_t ipAddress, uint32_t
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return handle_error(ret);
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}
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*/
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DEBUG_PRINT( "Setting up the SSL/TLS structure...\n");
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if ((ret = mbedtls_ssl_config_defaults(&ssl_client->ssl_conf,
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MBEDTLS_SSL_IS_CLIENT,
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MBEDTLS_SSL_TRANSPORT_STREAM,
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MBEDTLS_SSL_PRESET_DEFAULT)) != 0) {
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return handle_error(ret);
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}
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*/
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mbedtls_ssl_conf_rng(&ssl_client->ssl_conf, mbedtls_ctr_drbg_random, &ssl_client->drbg_ctx);
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#ifdef CONFIG_MBEDTLS_DEBUG
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mbedtls_debug_set_threshold(MBEDTLS_DEBUG_LEVEL);
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mbedtls_ssl_conf_dbg(&ssl_client->ssl_conf, mbedtls_debug, NULL);
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#endif
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if ((ret = mbedtls_ssl_setup(&ssl_client->ssl_ctx, &ssl_client->ssl_conf)) != 0) {
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return handle_error(ret);
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}
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mbedtls_ssl_set_bio(&ssl_client->ssl_ctx, &ssl_client->socket, mbedtls_net_send, mbedtls_net_recv, NULL );
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DEBUG_PRINT( "Performing the SSL/TLS handshake...\n");
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log_i("Performing the SSL/TLS handshake...");
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while ((ret = mbedtls_ssl_handshake(&ssl_client->ssl_ctx)) != 0) {
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if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE && ret != -76) {
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if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE && ret != -76) { //workaround for bug: https://github.com/espressif/esp-idf/issues/434
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return handle_error(ret);
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}
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delay(10);
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vPortYield();
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@ -252,32 +162,28 @@ int start_ssl_client(sslclient_context *ssl_client, uint32_t ipAddress, uint32_t
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if (cli_cert != NULL && cli_key != NULL) {
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DEBUG_PRINT("Protocol is %s \nCiphersuite is %s\n", mbedtls_ssl_get_version(&ssl_client->ssl_ctx), mbedtls_ssl_get_ciphersuite(&ssl_client->ssl_ctx));
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log_i("Protocol is %s Ciphersuite is %s", mbedtls_ssl_get_version(&ssl_client->ssl_ctx), mbedtls_ssl_get_ciphersuite(&ssl_client->ssl_ctx));
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if ((ret = mbedtls_ssl_get_record_expansion(&ssl_client->ssl_ctx)) >= 0) {
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DEBUG_PRINT("Record expansion is %d\n", ret);
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log_i("Record expansion is %d", ret);
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} else {
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DEBUG_PRINT("Record expansion is unknown (compression)\n");
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log_i("Record expansion is unknown (compression)");
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}
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}
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DEBUG_PRINT( "Verifying peer X.509 certificate...\n");
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log_i("Verifying peer X.509 certificate...");
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if ((flags = mbedtls_ssl_get_verify_result(&ssl_client->ssl_ctx)) != 0) {
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printf( "Failed to verify peer certificate!\n");
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log_e("Failed to verify peer certificate!");
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bzero(buf, sizeof(buf));
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mbedtls_x509_crt_verify_info(buf, sizeof(buf), " ! ", flags);
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printf( "verification info: %s\n", buf);
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log_e("verification info: %s", buf);
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stop_ssl_socket(ssl_client, rootCABuff, cli_cert, cli_key); //It's not safe continue.
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return handle_error(ret);
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} else {
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DEBUG_PRINT( "Certificate verified.\n");
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log_i("Certificate verified.");
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}
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DEBUG_PRINT("Free heap after TLS %u\n", xPortGetFreeHeapSize());
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log_i("Free heap after TLS %u", xPortGetFreeHeapSize());
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return ssl_client->socket;
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}
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@ -285,7 +191,7 @@ int start_ssl_client(sslclient_context *ssl_client, uint32_t ipAddress, uint32_t
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void stop_ssl_socket(sslclient_context *ssl_client, const char *rootCABuff, const char *cli_cert, const char *cli_key)
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{
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DEBUG_PRINT( "\nCleaning SSL connection.\n");
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log_i("Cleaning SSL connection.");
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if (ssl_client->socket >= 0) {
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close(ssl_client->socket);
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@ -313,13 +219,12 @@ void stop_ssl_socket(sslclient_context *ssl_client, const char *rootCABuff, cons
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int data_to_read(sslclient_context *ssl_client)
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{
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int ret, res;
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ret = mbedtls_ssl_read(&ssl_client->ssl_ctx, NULL, 0);
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//printf("RET: %i\n",ret); //for low level debug
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//log_e("RET: %i",ret); //for low level debug
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res = mbedtls_ssl_get_bytes_avail(&ssl_client->ssl_ctx);
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//printf("RES: %i\n",res);
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if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE && ret < 0 && ret != -76) { //RC:76 sockets is not connected
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//log_e("RES: %i",res);
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if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE && ret < 0 && ret != -76) {
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return handle_error(ret);
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}
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@ -327,33 +232,30 @@ int data_to_read(sslclient_context *ssl_client)
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}
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int send_ssl_data(sslclient_context *ssl_client, const uint8_t *data, uint16_t len)
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{
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//DEBUG_PRINT( "Writing HTTP request...\n"); //for low level debug
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//log_i("Writing HTTP request..."); //for low level debug
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int ret = -1;
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while ((ret = mbedtls_ssl_write(&ssl_client->ssl_ctx, data, len)) <= 0) {
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if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE && ret != -76) { //RC:76 sockets is not connected
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if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE && ret != -76) {
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return handle_error(ret);
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}
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}
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len = ret;
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//DEBUG_PRINT( "%d bytes written\n", len); //for low level debug
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//log_i("%d bytes written", len); //for low level debug
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return ret;
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}
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int get_ssl_receive(sslclient_context *ssl_client, uint8_t *data, int length)
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{
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//DEBUG_PRINT( "Reading HTTP response...\n"); //for low level debug
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//log_i( "Reading HTTP response..."); //for low level debug
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int ret = -1;
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ret = mbedtls_ssl_read(&ssl_client->ssl_ctx, data, length);
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//DEBUG_PRINT( "%d bytes readed\n", ret); //for low level debug
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//log_i( "%d bytes readed", ret); //for low level debug
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return ret;
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}
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Block a user