292 lines
7.3 KiB
C
292 lines
7.3 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 = SSL_read(tls->ssl, data, datalen);
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if (ret < 0) {
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int err = SSL_get_error(tls->ssl, ret);
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if (err != SSL_ERROR_WANT_WRITE && err != SSL_ERROR_WANT_READ) {
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ESP_LOGE(TAG, "read error :%d:", ret);
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}
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return -err;
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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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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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/* Unsupported Protocol 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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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 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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const SSL_METHOD *method = cfg->ssl_method!= NULL ? cfg->ssl_method : TLSv1_2_client_method();
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SSL_CTX *ssl_ctx = SSL_CTX_new(method);
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if (!ssl_ctx) {
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return -1;
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}
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#ifdef __APPLE__
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SSL_CTX_set_options(ssl_ctx, SSL_OP_ALL | SSL_OP_NO_SSLv2);
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SSL_CTX_set_mode(ssl_ctx, SSL_MODE_AUTO_RETRY);
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SSL_CTX_set_mode(ssl_ctx, SSL_MODE_RELEASE_BUFFERS);
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#endif
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if (cfg->cacert_pem_buf != NULL) {
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SSL_CTX_set_verify(ssl_ctx, SSL_VERIFY_PEER, NULL);
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BIO *bio;
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bio = BIO_new(BIO_s_mem());
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BIO_write(bio, cfg->cacert_pem_buf, cfg->cacert_pem_bytes);
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X509 *ca = PEM_read_bio_X509(bio, NULL, 0, NULL);
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if (!ca) {
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ESP_LOGE(TAG, "CA Error");
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X509_free(ca);
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BIO_free(bio);
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SSL_CTX_free(ssl_ctx);
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return -1;
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}
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ESP_LOGD(TAG, "CA OK");
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X509_STORE_add_cert(SSL_CTX_get_cert_store(ssl_ctx), ca);
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X509_free(ca);
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BIO_free(bio);
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}
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if (cfg->alpn_protos) {
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SSL_CTX_set_alpn_protos(ssl_ctx, cfg->alpn_protos, strlen((char *)cfg->alpn_protos));
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}
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SSL *ssl = SSL_new(ssl_ctx);
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if (!ssl) {
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SSL_CTX_free(ssl_ctx);
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return -1;
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}
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char *use_host = strndup(hostname, hostlen);
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if (!use_host) {
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SSL_CTX_free(ssl_ctx);
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return -1;
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}
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SSL_set_tlsext_host_name(ssl, use_host);
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free(use_host);
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SSL_set_fd(ssl, tls->sockfd);
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ret = SSL_connect(ssl);
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if (ret < 1) {
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ESP_LOGE(TAG, "SSL handshake failed");
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SSL_free(ssl);
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SSL_CTX_free(ssl_ctx);
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return -1;
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}
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tls->ctx = ssl_ctx;
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tls->ssl = ssl;
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return 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) {
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return;
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}
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if (tls->ssl) {
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SSL_free(tls->ssl);
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}
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if (tls->ctx) {
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SSL_CTX_free(tls->ctx);
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}
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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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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 = SSL_write(tls->ssl, data, datalen);
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if (ret < 0) {
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int err = SSL_get_error(tls->ssl, ret);
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if (err != SSL_ERROR_WANT_WRITE && err != SSL_ERROR_WANT_READ) {
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ESP_LOGE(TAG, "write error :%d:", ret);
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}
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return -err;
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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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}
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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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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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