268 lines
8.4 KiB
C
268 lines
8.4 KiB
C
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// Copyright 2015-2018 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <string.h>
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#include <stdlib.h>
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.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 "lwip/dns.h"
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#include "mbedtls/platform.h"
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#include "mbedtls/net_sockets.h"
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#include "mbedtls/esp_debug.h"
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#include "mbedtls/ssl.h"
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#include "mbedtls/entropy.h"
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#include "mbedtls/ctr_drbg.h"
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#include "mbedtls/error.h"
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#include "mbedtls/certs.h"
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#include "esp_log.h"
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#include "esp_system.h"
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#include "transport.h"
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#include "transport_ssl.h"
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#include "http_utils.h"
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static const char *TAG = "TRANS_SSL";
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/**
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* mbedtls specific transport data
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*/
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typedef struct {
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mbedtls_entropy_context entropy;
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mbedtls_ctr_drbg_context ctr_drbg;
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mbedtls_ssl_context ctx;
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mbedtls_x509_crt cacert;
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mbedtls_ssl_config conf;
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mbedtls_net_context client_fd;
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void *cert_pem_data;
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int cert_pem_len;
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bool ssl_initialized;
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bool verify_server;
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} transport_ssl_t;
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static int ssl_close(transport_handle_t t);
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static int ssl_connect(transport_handle_t t, const char *host, int port, int timeout_ms)
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{
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int ret = -1, flags;
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struct timeval tv;
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transport_ssl_t *ssl = transport_get_context_data(t);
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if (!ssl) {
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return -1;
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}
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ssl->ssl_initialized = true;
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mbedtls_ssl_init(&ssl->ctx);
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mbedtls_ctr_drbg_init(&ssl->ctr_drbg);
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mbedtls_ssl_config_init(&ssl->conf);
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mbedtls_entropy_init(&ssl->entropy);
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if ((ret = mbedtls_ssl_config_defaults(&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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ESP_LOGE(TAG, "mbedtls_ssl_config_defaults returned %d", ret);
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goto exit;
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}
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if ((ret = mbedtls_ctr_drbg_seed(&ssl->ctr_drbg, mbedtls_entropy_func, &ssl->entropy, NULL, 0)) != 0) {
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ESP_LOGE(TAG, "mbedtls_ctr_drbg_seed returned %d", ret);
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goto exit;
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}
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if (ssl->cert_pem_data) {
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mbedtls_x509_crt_init(&ssl->cacert);
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ssl->verify_server = true;
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if ((ret = mbedtls_x509_crt_parse(&ssl->cacert, ssl->cert_pem_data, ssl->cert_pem_len + 1)) < 0) {
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ESP_LOGE(TAG, "mbedtls_x509_crt_parse returned -0x%x\n\nDATA=%s,len=%d", -ret, (char*)ssl->cert_pem_data, ssl->cert_pem_len);
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goto exit;
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}
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mbedtls_ssl_conf_ca_chain(&ssl->conf, &ssl->cacert, NULL);
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mbedtls_ssl_conf_authmode(&ssl->conf, MBEDTLS_SSL_VERIFY_REQUIRED);
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if ((ret = mbedtls_ssl_set_hostname(&ssl->ctx, host)) != 0) {
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ESP_LOGE(TAG, "mbedtls_ssl_set_hostname returned -0x%x", -ret);
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goto exit;
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}
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} else {
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mbedtls_ssl_conf_authmode(&ssl->conf, MBEDTLS_SSL_VERIFY_NONE);
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}
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mbedtls_ssl_conf_rng(&ssl->conf, mbedtls_ctr_drbg_random, &ssl->ctr_drbg);
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#ifdef CONFIG_MBEDTLS_DEBUG
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mbedtls_esp_enable_debug_log(&ssl->conf, 4);
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#endif
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if ((ret = mbedtls_ssl_setup(&ssl->ctx, &ssl->conf)) != 0) {
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ESP_LOGE(TAG, "mbedtls_ssl_setup returned -0x%x\n\n", -ret);
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goto exit;
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}
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mbedtls_net_init(&ssl->client_fd);
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http_utils_ms_to_timeval(timeout_ms, &tv);
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setsockopt(ssl->client_fd.fd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv));
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ESP_LOGD(TAG, "Connect to %s:%d", host, port);
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char port_str[8] = {0};
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sprintf(port_str, "%d", port);
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if ((ret = mbedtls_net_connect(&ssl->client_fd, host, port_str, MBEDTLS_NET_PROTO_TCP)) != 0) {
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ESP_LOGE(TAG, "mbedtls_net_connect returned -%x", -ret);
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goto exit;
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}
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mbedtls_ssl_set_bio(&ssl->ctx, &ssl->client_fd, mbedtls_net_send, mbedtls_net_recv, NULL);
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if((ret = mbedtls_ssl_set_hostname(&ssl->ctx, host)) != 0) {
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ESP_LOGE(TAG, " failed\n ! mbedtls_ssl_set_hostname returned %d\n\n", ret);
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goto exit;
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}
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ESP_LOGD(TAG, "Performing the SSL/TLS handshake...");
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while ((ret = mbedtls_ssl_handshake(&ssl->ctx)) != 0) {
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if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
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ESP_LOGE(TAG, "mbedtls_ssl_handshake returned -0x%x", -ret);
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goto exit;
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}
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}
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ESP_LOGD(TAG, "Verifying peer X.509 certificate...");
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if ((flags = mbedtls_ssl_get_verify_result(&ssl->ctx)) != 0) {
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/* In real life, we probably want to close connection if ret != 0 */
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ESP_LOGW(TAG, "Failed to verify peer certificate!");
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if (ssl->cert_pem_data) {
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goto exit;
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}
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} else {
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ESP_LOGD(TAG, "Certificate verified.");
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}
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ESP_LOGD(TAG, "Cipher suite is %s", mbedtls_ssl_get_ciphersuite(&ssl->ctx));
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return ret;
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exit:
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ssl_close(t);
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return ret;
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}
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static int ssl_poll_read(transport_handle_t t, int timeout_ms)
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{
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transport_ssl_t *ssl = transport_get_context_data(t);
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fd_set readset;
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FD_ZERO(&readset);
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FD_SET(ssl->client_fd.fd, &readset);
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struct timeval timeout;
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http_utils_ms_to_timeval(timeout_ms, &timeout);
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return select(ssl->client_fd.fd + 1, &readset, NULL, NULL, &timeout);
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}
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static int ssl_poll_write(transport_handle_t t, int timeout_ms)
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{
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transport_ssl_t *ssl = transport_get_context_data(t);
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fd_set writeset;
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FD_ZERO(&writeset);
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FD_SET(ssl->client_fd.fd, &writeset);
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struct timeval timeout;
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http_utils_ms_to_timeval(timeout_ms, &timeout);
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return select(ssl->client_fd.fd + 1, NULL, &writeset, NULL, &timeout);
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}
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static int ssl_write(transport_handle_t t, const char *buffer, int len, int timeout_ms)
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{
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int poll, ret;
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transport_ssl_t *ssl = transport_get_context_data(t);
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if ((poll = transport_poll_write(t, timeout_ms)) <= 0) {
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ESP_LOGW(TAG, "Poll timeout or error, errno=%s, fd=%d, timeout_ms=%d", strerror(errno), ssl->client_fd.fd, timeout_ms);
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return poll;
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}
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ret = mbedtls_ssl_write(&ssl->ctx, (const unsigned char *) buffer, len);
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if (ret <= 0) {
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ESP_LOGE(TAG, "mbedtls_ssl_write error, errno=%s", strerror(errno));
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}
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return ret;
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}
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static int ssl_read(transport_handle_t t, char *buffer, int len, int timeout_ms)
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{
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int ret;
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transport_ssl_t *ssl = transport_get_context_data(t);
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ret = mbedtls_ssl_read(&ssl->ctx, (unsigned char *)buffer, len);
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if (ret == 0) {
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return -1;
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}
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return ret;
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}
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static int ssl_close(transport_handle_t t)
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{
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int ret = -1;
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transport_ssl_t *ssl = transport_get_context_data(t);
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if (ssl->ssl_initialized) {
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ESP_LOGD(TAG, "Cleanup mbedtls");
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mbedtls_ssl_close_notify(&ssl->ctx);
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mbedtls_ssl_session_reset(&ssl->ctx);
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mbedtls_net_free(&ssl->client_fd);
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mbedtls_ssl_config_free(&ssl->conf);
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if (ssl->verify_server) {
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mbedtls_x509_crt_free(&ssl->cacert);
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}
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mbedtls_ctr_drbg_free(&ssl->ctr_drbg);
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mbedtls_entropy_free(&ssl->entropy);
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mbedtls_ssl_free(&ssl->ctx);
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ssl->ssl_initialized = false;
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ssl->verify_server = false;
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}
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return ret;
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}
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static int ssl_destroy(transport_handle_t t)
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{
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transport_ssl_t *ssl = transport_get_context_data(t);
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transport_close(t);
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free(ssl);
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return 0;
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}
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void transport_ssl_set_cert_data(transport_handle_t t, const char *data, int len)
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{
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transport_ssl_t *ssl = transport_get_context_data(t);
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if (t && ssl) {
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ssl->cert_pem_data = (void *)data;
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ssl->cert_pem_len = len;
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}
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}
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transport_handle_t transport_ssl_init()
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{
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transport_handle_t t = transport_init();
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transport_ssl_t *ssl = calloc(1, sizeof(transport_ssl_t));
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HTTP_MEM_CHECK(TAG, ssl, return NULL);
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mbedtls_net_init(&ssl->client_fd);
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transport_set_context_data(t, ssl);
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transport_set_func(t, ssl_connect, ssl_read, ssl_write, ssl_close, ssl_poll_read, ssl_poll_write, ssl_destroy);
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return t;
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}
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