327 lines
9.4 KiB
C
327 lines
9.4 KiB
C
// Copyright 2017-2018 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 <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netdb.h>
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#include <http_parser.h>
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#include "esp_tls.h"
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static const char *TAG = "esp-tls";
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#ifdef ESP_PLATFORM
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#include <esp_log.h>
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#else
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#define ESP_LOGD(TAG, ...) //printf(__VA_ARGS__);
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#define ESP_LOGE(TAG, ...) printf(__VA_ARGS__);
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#endif
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static struct addrinfo *resolve_host_name(const char *host, size_t hostlen)
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{
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struct addrinfo hints;
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memset(&hints, 0, sizeof(hints));
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hints.ai_family = AF_UNSPEC;
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hints.ai_socktype = SOCK_STREAM;
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char *use_host = strndup(host, hostlen);
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if (!use_host) {
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return NULL;
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}
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ESP_LOGD(TAG, "host:%s: strlen %lu", use_host, (unsigned long)hostlen);
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struct addrinfo *res;
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if (getaddrinfo(use_host, NULL, &hints, &res)) {
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ESP_LOGE(TAG, "couldn't get hostname for :%s:", use_host);
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free(use_host);
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return NULL;
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}
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free(use_host);
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return res;
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}
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static ssize_t tcp_read(esp_tls_t *tls, char *data, size_t datalen)
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{
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return recv(tls->sockfd, data, datalen, 0);
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}
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static ssize_t tls_read(esp_tls_t *tls, char *data, size_t datalen)
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{
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ssize_t ret = mbedtls_ssl_read(&tls->ssl, (unsigned char *)data, datalen);
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if (ret < 0) {
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if (ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY) {
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return 0;
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}
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if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
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ESP_LOGE(TAG, "read error :%d:", ret);
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}
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}
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return ret;
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}
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static int esp_tcp_connect(const char *host, int hostlen, int port)
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{
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struct addrinfo *res = resolve_host_name(host, hostlen);
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if (!res) {
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return -1;
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}
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int ret = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
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if (ret < 0) {
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ESP_LOGE(TAG, "Failed to create socket (family %d socktype %d protocol %d)", res->ai_family, res->ai_socktype, res->ai_protocol);
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goto err_freeaddr;
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}
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int fd = ret;
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void *addr_ptr;
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if (res->ai_family == AF_INET) {
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struct sockaddr_in *p = (struct sockaddr_in *)res->ai_addr;
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p->sin_port = htons(port);
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addr_ptr = p;
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} else if (res->ai_family == AF_INET6) {
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struct sockaddr_in6 *p = (struct sockaddr_in6 *)res->ai_addr;
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p->sin6_port = htons(port);
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p->sin6_family = AF_INET6;
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addr_ptr = p;
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} else {
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ESP_LOGE(TAG, "Unsupported protocol family %d", res->ai_family);
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goto err_freesocket;
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}
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ret = connect(fd, addr_ptr, res->ai_addrlen);
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if (ret < 0) {
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ESP_LOGE(TAG, "Failed to connnect to host (errno %d)", errno);
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goto err_freesocket;
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}
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freeaddrinfo(res);
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return fd;
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err_freesocket:
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close(fd);
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err_freeaddr:
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freeaddrinfo(res);
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return -1;
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}
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static void verify_certificate(esp_tls_t *tls)
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{
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int flags;
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char buf[100];
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if ((flags = mbedtls_ssl_get_verify_result(&tls->ssl)) != 0) {
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ESP_LOGI(TAG, "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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ESP_LOGI(TAG, "verification info: %s", buf);
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} else {
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ESP_LOGI(TAG, "Certificate verified.");
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}
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}
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static void mbedtls_cleanup(esp_tls_t *tls)
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{
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if (!tls) {
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return;
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}
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mbedtls_x509_crt_free(&tls->cacert);
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mbedtls_entropy_free(&tls->entropy);
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mbedtls_ssl_config_free(&tls->conf);
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mbedtls_ctr_drbg_free(&tls->ctr_drbg);
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mbedtls_ssl_free(&tls->ssl);
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mbedtls_net_free(&tls->server_fd);
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}
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static int create_ssl_handle(esp_tls_t *tls, const char *hostname, size_t hostlen, const esp_tls_cfg_t *cfg)
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{
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int ret;
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mbedtls_net_init(&tls->server_fd);
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tls->server_fd.fd = tls->sockfd;
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mbedtls_ssl_init(&tls->ssl);
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mbedtls_ctr_drbg_init(&tls->ctr_drbg);
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mbedtls_ssl_config_init(&tls->conf);
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mbedtls_entropy_init(&tls->entropy);
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if ((ret = mbedtls_ctr_drbg_seed(&tls->ctr_drbg,
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mbedtls_entropy_func, &tls->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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/* Hostname set here should match CN in server certificate */
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char *use_host = strndup(hostname, hostlen);
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if (!use_host) {
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goto exit;
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}
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if ((ret = mbedtls_ssl_set_hostname(&tls->ssl, use_host)) != 0) {
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ESP_LOGE(TAG, "mbedtls_ssl_set_hostname returned -0x%x", -ret);
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free(use_host);
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goto exit;
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}
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free(use_host);
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if ((ret = mbedtls_ssl_config_defaults(&tls->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 (cfg->alpn_protos) {
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mbedtls_ssl_conf_alpn_protocols(&tls->conf, cfg->alpn_protos);
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}
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if (cfg->cacert_pem_buf != NULL) {
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mbedtls_x509_crt_init(&tls->cacert);
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ret = mbedtls_x509_crt_parse(&tls->cacert, cfg->cacert_pem_buf, cfg->cacert_pem_bytes);
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if (ret < 0) {
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ESP_LOGE(TAG, "mbedtls_x509_crt_parse returned -0x%x\n\n", -ret);
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goto exit;
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}
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mbedtls_ssl_conf_authmode(&tls->conf, MBEDTLS_SSL_VERIFY_REQUIRED);
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mbedtls_ssl_conf_ca_chain(&tls->conf, &tls->cacert, NULL);
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} else {
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mbedtls_ssl_conf_authmode(&tls->conf, MBEDTLS_SSL_VERIFY_NONE);
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}
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mbedtls_ssl_conf_rng(&tls->conf, mbedtls_ctr_drbg_random, &tls->ctr_drbg);
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#ifdef CONFIG_MBEDTLS_DEBUG
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mbedtls_esp_enable_debug_log(&tls->conf, 4);
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#endif
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if ((ret = mbedtls_ssl_setup(&tls->ssl, &tls->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_ssl_set_bio(&tls->ssl, &tls->server_fd, mbedtls_net_send, mbedtls_net_recv, NULL);
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while ((ret = mbedtls_ssl_handshake(&tls->ssl)) != 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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if (cfg->cacert_pem_buf != NULL) {
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/* This is to check whether handshake failed due to invalid certificate*/
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verify_certificate(tls);
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}
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goto exit;
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}
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}
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return 0;
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exit:
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mbedtls_cleanup(tls);
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return -1;
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}
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/**
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* @brief Close the TLS connection and free any allocated resources.
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*/
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void esp_tls_conn_delete(esp_tls_t *tls)
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{
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if (tls != NULL) {
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mbedtls_cleanup(tls);
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if (tls->sockfd) {
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close(tls->sockfd);
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}
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free(tls);
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}
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};
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static ssize_t tcp_write(esp_tls_t *tls, const char *data, size_t datalen)
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{
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return send(tls->sockfd, data, datalen, 0);
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}
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static ssize_t tls_write(esp_tls_t *tls, const char *data, size_t datalen)
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{
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ssize_t ret = mbedtls_ssl_write(&tls->ssl, (unsigned char*) data, datalen);
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if (ret < 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, "write error :%d:", ret);
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}
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}
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return ret;
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}
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/**
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* @brief Create a new TLS/SSL connection
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*/
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esp_tls_t *esp_tls_conn_new(const char *hostname, int hostlen, int port, const esp_tls_cfg_t *cfg)
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{
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int sockfd = esp_tcp_connect(hostname, hostlen, port);
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if (sockfd < 0) {
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return NULL;
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}
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esp_tls_t *tls = (esp_tls_t *)calloc(1, sizeof(esp_tls_t));
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if (!tls) {
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close(sockfd);
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return NULL;
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}
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tls->sockfd = sockfd;
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tls->read = tcp_read;
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tls->write = tcp_write;
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if (cfg) {
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if (create_ssl_handle(tls, hostname, hostlen, cfg) != 0) {
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esp_tls_conn_delete(tls);
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return NULL;
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}
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tls->read = tls_read;
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tls->write = tls_write;
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if (cfg->non_block == true) {
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int flags = fcntl(tls->sockfd, F_GETFL, 0);
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fcntl(tls->sockfd, F_SETFL, flags | O_NONBLOCK);
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}
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}
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return tls;
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}
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static int get_port(const char *url, struct http_parser_url *u)
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{
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if (u->field_data[UF_PORT].len) {
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return strtol(&url[u->field_data[UF_PORT].off], NULL, 10);
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} else {
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if (strncmp(&url[u->field_data[UF_SCHEMA].off], "http", u->field_data[UF_SCHEMA].len) == 0) {
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return 80;
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} else if (strncmp(&url[u->field_data[UF_SCHEMA].off], "https", u->field_data[UF_SCHEMA].len) == 0) {
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return 443;
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}
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}
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return 0;
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}
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/**
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* @brief Create a new TLS/SSL connection with a given "HTTP" url
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*/
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esp_tls_t *esp_tls_conn_http_new(const char *url, const esp_tls_cfg_t *cfg)
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{
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/* Parse URI */
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struct http_parser_url u;
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http_parser_url_init(&u);
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http_parser_parse_url(url, strlen(url), 0, &u);
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/* Connect to host */
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return esp_tls_conn_new(&url[u.field_data[UF_HOST].off], u.field_data[UF_HOST].len,
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get_port(url, &u), cfg);
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}
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