484 lines
17 KiB
C
484 lines
17 KiB
C
// Copyright 2019 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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#include "esp_tls_error_capture_internal.h"
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#include <errno.h>
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static const char *TAG = "esp-tls";
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#ifdef CONFIG_ESP_TLS_USING_MBEDTLS
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#include "esp_tls_mbedtls.h"
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#elif CONFIG_ESP_TLS_USING_WOLFSSL
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#include "esp_tls_wolfssl.h"
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#endif
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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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#ifdef CONFIG_ESP_TLS_USING_MBEDTLS
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#define _esp_create_ssl_handle esp_create_mbedtls_handle
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#define _esp_tls_handshake esp_mbedtls_handshake
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#define _esp_tls_read esp_mbedtls_read
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#define _esp_tls_write esp_mbedtls_write
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#define _esp_tls_conn_delete esp_mbedtls_conn_delete
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#ifdef CONFIG_ESP_TLS_SERVER
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#define _esp_tls_server_session_create esp_mbedtls_server_session_create
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#define _esp_tls_server_session_delete esp_mbedtls_server_session_delete
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#endif /* CONFIG_ESP_TLS_SERVER */
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#define _esp_tls_get_bytes_avail esp_mbedtls_get_bytes_avail
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#define _esp_tls_init_global_ca_store esp_mbedtls_init_global_ca_store
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#define _esp_tls_set_global_ca_store esp_mbedtls_set_global_ca_store /*!< Callback function for setting global CA store data for TLS/SSL */
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#define _esp_tls_get_global_ca_store esp_mbedtls_get_global_ca_store
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#define _esp_tls_free_global_ca_store esp_mbedtls_free_global_ca_store /*!< Callback function for freeing global ca store for TLS/SSL */
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#elif CONFIG_ESP_TLS_USING_WOLFSSL /* CONFIG_ESP_TLS_USING_MBEDTLS */
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#define _esp_create_ssl_handle esp_create_wolfssl_handle
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#define _esp_tls_handshake esp_wolfssl_handshake
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#define _esp_tls_read esp_wolfssl_read
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#define _esp_tls_write esp_wolfssl_write
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#define _esp_tls_conn_delete esp_wolfssl_conn_delete
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#define _esp_tls_get_bytes_avail esp_wolfssl_get_bytes_avail
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#define _esp_tls_init_global_ca_store esp_wolfssl_init_global_ca_store
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#define _esp_tls_set_global_ca_store esp_wolfssl_set_global_ca_store /*!< Callback function for setting global CA store data for TLS/SSL */
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#define _esp_tls_free_global_ca_store esp_wolfssl_free_global_ca_store /*!< Callback function for freeing global ca store for TLS/SSL */
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#else /* ESP_TLS_USING_WOLFSSL */
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#error "No TLS stack configured"
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#endif
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static esp_err_t create_ssl_handle(const char *hostname, size_t hostlen, const void *cfg, esp_tls_t *tls)
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{
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return _esp_create_ssl_handle(hostname, hostlen, cfg, tls);
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}
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static esp_err_t esp_tls_handshake(esp_tls_t *tls, const esp_tls_cfg_t *cfg)
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{
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return _esp_tls_handshake(tls, cfg);
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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 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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/**
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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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_esp_tls_conn_delete(tls);
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if (tls->sockfd >= 0) {
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close(tls->sockfd);
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}
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free(tls->error_handle);
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free(tls);
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}
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}
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esp_tls_t *esp_tls_init(void)
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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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return NULL;
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}
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tls->error_handle = calloc(1, sizeof(esp_tls_last_error_t));
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if (!tls->error_handle) {
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free(tls);
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return NULL;
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}
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#ifdef CONFIG_ESP_TLS_USING_MBEDTLS
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tls->server_fd.fd = tls->sockfd = -1;
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#endif
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return tls;
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}
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static esp_err_t resolve_host_name(const char *host, size_t hostlen, struct addrinfo **address_info)
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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 ESP_ERR_NO_MEM;
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}
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ESP_LOGD(TAG, "host:%s: strlen %lu", use_host, (unsigned long)hostlen);
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if (getaddrinfo(use_host, NULL, &hints, address_info)) {
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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 ESP_ERR_ESP_TLS_CANNOT_RESOLVE_HOSTNAME;
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}
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free(use_host);
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return ESP_OK;
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}
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static void ms_to_timeval(int timeout_ms, struct timeval *tv)
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{
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tv->tv_sec = timeout_ms / 1000;
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tv->tv_usec = (timeout_ms % 1000) * 1000;
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}
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static esp_err_t esp_tcp_connect(const char *host, int hostlen, int port, int *sockfd, const esp_tls_t *tls, const esp_tls_cfg_t *cfg)
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{
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esp_err_t ret;
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struct addrinfo *addrinfo;
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if ((ret = resolve_host_name(host, hostlen, &addrinfo)) != ESP_OK) {
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return ret;
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}
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int fd = socket(addrinfo->ai_family, addrinfo->ai_socktype, addrinfo->ai_protocol);
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if (fd < 0) {
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ESP_LOGE(TAG, "Failed to create socket (family %d socktype %d protocol %d)", addrinfo->ai_family, addrinfo->ai_socktype, addrinfo->ai_protocol);
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ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ERR_TYPE_SYSTEM, errno);
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ret = ESP_ERR_ESP_TLS_CANNOT_CREATE_SOCKET;
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goto err_freeaddr;
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}
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void *addr_ptr;
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if (addrinfo->ai_family == AF_INET) {
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struct sockaddr_in *p = (struct sockaddr_in *)addrinfo->ai_addr;
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p->sin_port = htons(port);
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addr_ptr = p;
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} else if (addrinfo->ai_family == AF_INET6) {
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struct sockaddr_in6 *p = (struct sockaddr_in6 *)addrinfo->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", addrinfo->ai_family);
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ret = ESP_ERR_ESP_TLS_UNSUPPORTED_PROTOCOL_FAMILY;
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goto err_freesocket;
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}
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if (cfg) {
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if (cfg->timeout_ms >= 0) {
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struct timeval tv;
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ms_to_timeval(cfg->timeout_ms, &tv);
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setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv));
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setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv));
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}
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if (cfg->non_block) {
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int flags = fcntl(fd, F_GETFL, 0);
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ret = fcntl(fd, F_SETFL, flags | O_NONBLOCK);
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if (ret < 0) {
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ESP_LOGE(TAG, "Failed to configure the socket as non-blocking (errno %d)", errno);
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goto err_freesocket;
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}
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}
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}
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ret = connect(fd, addr_ptr, addrinfo->ai_addrlen);
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if (ret < 0 && !(errno == EINPROGRESS && cfg && cfg->non_block)) {
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ESP_LOGE(TAG, "Failed to connnect to host (errno %d)", errno);
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ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ERR_TYPE_SYSTEM, errno);
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ret = ESP_ERR_ESP_TLS_FAILED_CONNECT_TO_HOST;
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goto err_freesocket;
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}
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*sockfd = fd;
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freeaddrinfo(addrinfo);
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return ESP_OK;
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err_freesocket:
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close(fd);
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err_freeaddr:
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freeaddrinfo(addrinfo);
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return ret;
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}
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static int esp_tls_low_level_conn(const char *hostname, int hostlen, int port, const esp_tls_cfg_t *cfg, esp_tls_t *tls)
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{
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if (!tls) {
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ESP_LOGE(TAG, "empty esp_tls parameter");
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return -1;
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}
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esp_err_t esp_ret;
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/* These states are used to keep a tab on connection progress in case of non-blocking connect,
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and in case of blocking connect these cases will get executed one after the other */
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switch (tls->conn_state) {
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case ESP_TLS_INIT:
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tls->sockfd = -1;
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if (cfg != NULL) {
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#ifdef CONFIG_ESP_TLS_USING_MBEDTLS
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mbedtls_net_init(&tls->server_fd);
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#endif
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tls->is_tls = true;
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}
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if ((esp_ret = esp_tcp_connect(hostname, hostlen, port, &tls->sockfd, tls, cfg)) != ESP_OK) {
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ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ERR_TYPE_ESP, esp_ret);
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return -1;
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}
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if (!cfg) {
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tls->read = tcp_read;
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tls->write = tcp_write;
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ESP_LOGD(TAG, "non-tls connection established");
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return 1;
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}
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if (cfg->non_block) {
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FD_ZERO(&tls->rset);
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FD_SET(tls->sockfd, &tls->rset);
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tls->wset = tls->rset;
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}
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tls->conn_state = ESP_TLS_CONNECTING;
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/* falls through */
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case ESP_TLS_CONNECTING:
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if (cfg->non_block) {
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ESP_LOGD(TAG, "connecting...");
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struct timeval tv;
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ms_to_timeval(cfg->timeout_ms, &tv);
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/* In case of non-blocking I/O, we use the select() API to check whether
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connection has been established or not*/
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if (select(tls->sockfd + 1, &tls->rset, &tls->wset, NULL,
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cfg->timeout_ms>0 ? &tv : NULL) == 0) {
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ESP_LOGD(TAG, "select() timed out");
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return 0;
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}
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if (FD_ISSET(tls->sockfd, &tls->rset) || FD_ISSET(tls->sockfd, &tls->wset)) {
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int error;
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unsigned int len = sizeof(error);
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/* pending error check */
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if (getsockopt(tls->sockfd, SOL_SOCKET, SO_ERROR, &error, &len) < 0) {
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ESP_LOGD(TAG, "Non blocking connect failed");
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ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ERR_TYPE_SYSTEM, errno);
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ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ERR_TYPE_ESP, ESP_ERR_ESP_TLS_SOCKET_SETOPT_FAILED);
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tls->conn_state = ESP_TLS_FAIL;
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return -1;
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}
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}
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}
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/* By now, the connection has been established */
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esp_ret = create_ssl_handle(hostname, hostlen, cfg, tls);
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if (esp_ret != ESP_OK) {
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ESP_LOGE(TAG, "create_ssl_handle failed");
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ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ERR_TYPE_ESP, esp_ret);
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tls->conn_state = ESP_TLS_FAIL;
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return -1;
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}
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tls->read = _esp_tls_read;
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tls->write = _esp_tls_write;
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tls->conn_state = ESP_TLS_HANDSHAKE;
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/* falls through */
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case ESP_TLS_HANDSHAKE:
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ESP_LOGD(TAG, "handshake in progress...");
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return esp_tls_handshake(tls, cfg);
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break;
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case ESP_TLS_FAIL:
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ESP_LOGE(TAG, "failed to open a new connection");;
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break;
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default:
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ESP_LOGE(TAG, "invalid esp-tls state");
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break;
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}
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return -1;
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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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esp_tls_t *tls = (esp_tls_t *)calloc(1, sizeof(esp_tls_t));
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if (!tls) {
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return NULL;
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}
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/* esp_tls_conn_new() API establishes connection in a blocking manner thus this loop ensures that esp_tls_conn_new()
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API returns only after connection is established unless there is an error*/
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size_t start = xTaskGetTickCount();
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while (1) {
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int ret = esp_tls_low_level_conn(hostname, hostlen, port, cfg, tls);
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if (ret == 1) {
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return tls;
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} else if (ret == -1) {
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esp_tls_conn_delete(tls);
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ESP_LOGE(TAG, "Failed to open new connection");
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return NULL;
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} else if (ret == 0 && cfg->timeout_ms >= 0) {
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size_t timeout_ticks = pdMS_TO_TICKS(cfg->timeout_ms);
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uint32_t expired = xTaskGetTickCount() - start;
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if (expired >= timeout_ticks) {
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esp_tls_conn_delete(tls);
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ESP_LOGE(TAG, "Failed to open new connection in specified timeout");
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return NULL;
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}
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}
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}
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return NULL;
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}
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int esp_tls_conn_new_sync(const char *hostname, int hostlen, int port, const esp_tls_cfg_t *cfg, esp_tls_t *tls)
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{
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/* esp_tls_conn_new_sync() is a sync alternative to esp_tls_conn_new_async() with symmetric function prototype
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it is an alternative to esp_tls_conn_new() which is left for compatibility reasons */
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size_t start = xTaskGetTickCount();
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while (1) {
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int ret = esp_tls_low_level_conn(hostname, hostlen, port, cfg, tls);
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if (ret == 1) {
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return ret;
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} else if (ret == -1) {
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ESP_LOGE(TAG, "Failed to open new connection");
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return -1;
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} else if (ret == 0 && cfg->timeout_ms >= 0) {
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size_t timeout_ticks = pdMS_TO_TICKS(cfg->timeout_ms);
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uint32_t expired = xTaskGetTickCount() - start;
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if (expired >= timeout_ticks) {
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ESP_LOGW(TAG, "Failed to open new connection in specified timeout");
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ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ERR_TYPE_ESP, ESP_ERR_ESP_TLS_CONNECTION_TIMEOUT);
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return 0;
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}
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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 non-blocking connection
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*/
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int esp_tls_conn_new_async(const char *hostname, int hostlen, int port, const esp_tls_cfg_t *cfg, esp_tls_t *tls)
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{
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return esp_tls_low_level_conn(hostname, hostlen, port, cfg, 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 (strncasecmp(&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 (strncasecmp(&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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esp_tls_t *tls = esp_tls_init();
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if (!tls) {
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return NULL;
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}
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/* Connect to host */
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if (esp_tls_conn_new_sync(&url[u.field_data[UF_HOST].off], u.field_data[UF_HOST].len,
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get_port(url, &u), cfg, tls) == 1) {
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return tls;
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}
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esp_tls_conn_delete(tls);
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return NULL;
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}
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/**
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* @brief Create a new non-blocking TLS/SSL connection with a given "HTTP" url
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*/
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int esp_tls_conn_http_new_async(const char *url, const esp_tls_cfg_t *cfg, esp_tls_t *tls)
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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_async(&url[u.field_data[UF_HOST].off], u.field_data[UF_HOST].len,
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get_port(url, &u), cfg, tls);
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}
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#ifdef CONFIG_ESP_TLS_USING_MBEDTLS
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mbedtls_x509_crt *esp_tls_get_global_ca_store(void)
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{
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return _esp_tls_get_global_ca_store();
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}
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#ifdef CONFIG_ESP_TLS_SERVER
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/**
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* @brief Create a server side TLS/SSL connection
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*/
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int esp_tls_server_session_create(esp_tls_cfg_server_t *cfg, int sockfd, esp_tls_t *tls)
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{
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return _esp_tls_server_session_create(cfg, sockfd, tls);
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}
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/**
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* @brief Close the server side TLS/SSL connection and free any allocated resources.
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*/
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void esp_tls_server_session_delete(esp_tls_t *tls)
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{
|
|
return _esp_tls_server_session_delete(tls);
|
|
}
|
|
#endif /* CONFIG_ESP_TLS_SERVER */
|
|
#endif /* CONFIG_ESP_TLS_USING_MBEDTLS */
|
|
|
|
ssize_t esp_tls_get_bytes_avail(esp_tls_t *tls)
|
|
{
|
|
return _esp_tls_get_bytes_avail(tls);
|
|
}
|
|
|
|
esp_err_t esp_tls_get_and_clear_last_error(esp_tls_error_handle_t h, int *esp_tls_code, int *esp_tls_flags)
|
|
{
|
|
if (!h) {
|
|
return ESP_ERR_INVALID_STATE;
|
|
}
|
|
esp_err_t last_err = h->last_error;
|
|
if (esp_tls_code) {
|
|
*esp_tls_code = h->esp_tls_error_code;
|
|
}
|
|
if (esp_tls_flags) {
|
|
*esp_tls_flags = h->esp_tls_flags;
|
|
}
|
|
memset(h, 0, sizeof(esp_tls_last_error_t));
|
|
return last_err;
|
|
}
|
|
|
|
esp_err_t esp_tls_init_global_ca_store(void)
|
|
{
|
|
return _esp_tls_init_global_ca_store();
|
|
}
|
|
|
|
esp_err_t esp_tls_set_global_ca_store(const unsigned char *cacert_pem_buf, const unsigned int cacert_pem_bytes)
|
|
{
|
|
return _esp_tls_set_global_ca_store(cacert_pem_buf, cacert_pem_bytes);
|
|
}
|
|
|
|
void esp_tls_free_global_ca_store(void)
|
|
{
|
|
return _esp_tls_free_global_ca_store();
|
|
}
|