833 lines
28 KiB
C
833 lines
28 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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#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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static mbedtls_x509_crt *global_cacert = NULL;
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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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typedef struct esp_tls_pki_t {
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mbedtls_x509_crt *public_cert;
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mbedtls_pk_context *pk_key;
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const unsigned char *publiccert_pem_buf;
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unsigned int publiccert_pem_bytes;
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const unsigned char *privkey_pem_buf;
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unsigned int privkey_pem_bytes;
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const unsigned char *privkey_password;
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unsigned int privkey_password_len;
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} esp_tls_pki_t;
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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 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_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ERR_TYPE_MBEDTLS, -ret);
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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 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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}
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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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esp_err_t esp_tls_init_global_ca_store()
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{
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if (global_cacert == NULL) {
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global_cacert = (mbedtls_x509_crt *)calloc(1, sizeof(mbedtls_x509_crt));
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if (global_cacert == NULL) {
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ESP_LOGE(TAG, "global_cacert not allocated");
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return ESP_ERR_NO_MEM;
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}
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mbedtls_x509_crt_init(global_cacert);
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}
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return ESP_OK;
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}
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esp_err_t esp_tls_set_global_ca_store(const unsigned char *cacert_pem_buf, const unsigned int cacert_pem_bytes)
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{
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int ret;
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if (cacert_pem_buf == NULL) {
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ESP_LOGE(TAG, "cacert_pem_buf is null");
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return ESP_ERR_INVALID_ARG;
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}
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if (global_cacert == NULL) {
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ret = esp_tls_init_global_ca_store();
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if (ret != ESP_OK) {
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return ret;
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}
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}
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ret = mbedtls_x509_crt_parse(global_cacert, cacert_pem_buf, cacert_pem_bytes);
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if (ret < 0) {
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ESP_LOGE(TAG, "mbedtls_x509_crt_parse returned -0x%x", -ret);
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mbedtls_x509_crt_free(global_cacert);
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global_cacert = NULL;
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return ESP_FAIL;
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} else if (ret > 0) {
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ESP_LOGE(TAG, "mbedtls_x509_crt_parse was partly successful. No. of failed certificates: %d", ret);
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return ESP_ERR_MBEDTLS_CERT_PARTLY_OK;
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}
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return ESP_OK;
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}
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mbedtls_x509_crt *esp_tls_get_global_ca_store()
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{
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return global_cacert;
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}
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void esp_tls_free_global_ca_store()
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{
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if (global_cacert) {
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mbedtls_x509_crt_free(global_cacert);
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global_cacert = NULL;
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}
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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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ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ERR_TYPE_MBEDTLS_CERT_FLAGS, flags);
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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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if (tls->cacert_ptr != global_cacert) {
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mbedtls_x509_crt_free(tls->cacert_ptr);
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}
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tls->cacert_ptr = NULL;
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#ifdef CONFIG_ESP_TLS_SERVER
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mbedtls_x509_crt_free(&tls->servercert);
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mbedtls_pk_free(&tls->serverkey);
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#endif
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mbedtls_x509_crt_free(&tls->cacert);
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mbedtls_x509_crt_free(&tls->clientcert);
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mbedtls_pk_free(&tls->clientkey);
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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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}
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static esp_err_t set_global_ca_store(esp_tls_t *tls)
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{
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assert(tls);
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if (global_cacert == NULL) {
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ESP_LOGE(TAG, "global_cacert is NULL");
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return ESP_ERR_INVALID_STATE;
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}
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tls->cacert_ptr = global_cacert;
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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_ptr, NULL);
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return ESP_OK;
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}
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static esp_err_t set_ca_cert(esp_tls_t *tls, const unsigned char *cacert, size_t cacert_len)
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{
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assert(tls);
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tls->cacert_ptr = &tls->cacert;
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mbedtls_x509_crt_init(tls->cacert_ptr);
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int ret = mbedtls_x509_crt_parse(tls->cacert_ptr, cacert, cacert_len);
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if (ret < 0) {
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ESP_LOGE(TAG, "mbedtls_x509_crt_parse returned -0x%x", -ret);
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ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ERR_TYPE_MBEDTLS, -ret);
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return ESP_ERR_MBEDTLS_X509_CRT_PARSE_FAILED;
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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_ptr, NULL);
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return ESP_OK;
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}
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static esp_err_t set_pki_context(esp_tls_t *tls, const esp_tls_pki_t *pki)
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{
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assert(tls);
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assert(pki);
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int ret;
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if (pki->publiccert_pem_buf != NULL &&
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pki->privkey_pem_buf != NULL &&
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pki->public_cert != NULL &&
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pki->pk_key != NULL) {
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mbedtls_x509_crt_init(pki->public_cert);
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mbedtls_pk_init(pki->pk_key);
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ret = mbedtls_x509_crt_parse(pki->public_cert, pki->publiccert_pem_buf, pki->publiccert_pem_bytes);
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if (ret < 0) {
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ESP_LOGE(TAG, "mbedtls_x509_crt_parse returned -0x%x", -ret);
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ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ERR_TYPE_MBEDTLS, -ret);
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return ESP_ERR_MBEDTLS_X509_CRT_PARSE_FAILED;
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}
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ret = mbedtls_pk_parse_key(pki->pk_key, pki->privkey_pem_buf, pki->privkey_pem_bytes,
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NULL, 0);
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if (ret < 0) {
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ESP_LOGE(TAG, "mbedtls_pk_parse_keyfile returned -0x%x", -ret);
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ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ERR_TYPE_MBEDTLS, -ret);
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return ESP_ERR_MBEDTLS_PK_PARSE_KEY_FAILED;
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}
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ret = mbedtls_ssl_conf_own_cert(&tls->conf, pki->public_cert, pki->pk_key);
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if (ret < 0) {
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ESP_LOGE(TAG, "mbedtls_ssl_conf_own_cert returned -0x%x", -ret);
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ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ERR_TYPE_MBEDTLS, -ret);
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return ESP_ERR_MBEDTLS_SSL_CONF_OWN_CERT_FAILED;
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}
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} else {
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return ESP_ERR_INVALID_ARG;
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}
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return ESP_OK;
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}
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#ifdef CONFIG_ESP_TLS_SERVER
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static esp_err_t set_server_config(esp_tls_cfg_server_t *cfg, esp_tls_t *tls)
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{
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assert(cfg != NULL);
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assert(tls != NULL);
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int ret;
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esp_err_t esp_ret;
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if ((ret = mbedtls_ssl_config_defaults(&tls->conf,
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MBEDTLS_SSL_IS_SERVER,
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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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ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ERR_TYPE_MBEDTLS, -ret);
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return ESP_ERR_MBEDTLS_SSL_CONFIG_DEFAULTS_FAILED;
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}
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#ifdef CONFIG_MBEDTLS_SSL_ALPN
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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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#endif
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if (cfg->cacert_pem_buf != NULL) {
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esp_ret = set_ca_cert(tls, cfg->cacert_pem_buf, cfg->cacert_pem_bytes);
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if (esp_ret != ESP_OK) {
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return esp_ret;
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}
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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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if (cfg->servercert_pem_buf != NULL && cfg->serverkey_pem_buf != NULL) {
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esp_tls_pki_t pki = {
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.public_cert = &tls->servercert,
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.pk_key = &tls->serverkey,
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.publiccert_pem_buf = cfg->servercert_pem_buf,
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.publiccert_pem_bytes = cfg->servercert_pem_bytes,
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.privkey_pem_buf = cfg->serverkey_pem_buf,
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.privkey_pem_bytes = cfg->serverkey_pem_bytes,
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.privkey_password = cfg->serverkey_password,
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.privkey_password_len = cfg->serverkey_password_len,
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};
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esp_ret = set_pki_context(tls, &pki);
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if (esp_ret != ESP_OK) {
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ESP_LOGE(TAG, "Failed to set server pki context");
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return esp_ret;
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}
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} else {
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ESP_LOGE(TAG, "Missing server certificate and/or key");
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return ESP_ERR_INVALID_STATE;
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}
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return ESP_OK;
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}
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#endif /* ! CONFIG_ESP_TLS_SERVER */
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static esp_err_t set_client_config(const char *hostname, size_t hostlen, esp_tls_cfg_t *cfg, esp_tls_t *tls)
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{
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assert(cfg != NULL);
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assert(tls != NULL);
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int ret;
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if (!cfg->skip_common_name) {
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char *use_host = NULL;
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if (cfg->common_name != NULL) {
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use_host = strndup(cfg->common_name, strlen(cfg->common_name));
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} else {
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use_host = strndup(hostname, hostlen);
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}
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if (use_host == NULL) {
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return ESP_ERR_NO_MEM;
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}
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/* Hostname set here should match CN in server certificate */
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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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ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ERR_TYPE_MBEDTLS, -ret);
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free(use_host);
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return ESP_ERR_MBEDTLS_SSL_SET_HOSTNAME_FAILED;
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}
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free(use_host);
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}
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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 -0x%x", -ret);
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ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ERR_TYPE_MBEDTLS, -ret);
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return ESP_ERR_MBEDTLS_SSL_CONFIG_DEFAULTS_FAILED;
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}
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#ifdef CONFIG_MBEDTLS_SSL_ALPN
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if (cfg->alpn_protos) {
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if ((ret =mbedtls_ssl_conf_alpn_protocols(&tls->conf, cfg->alpn_protos) != 0)) {
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ESP_LOGE(TAG, "mbedtls_ssl_conf_alpn_protocols returned -0x%x", -ret);
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ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ERR_TYPE_MBEDTLS, -ret);
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return ESP_ERR_MBEDTLS_SSL_CONF_ALPN_PROTOCOLS_FAILED;
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}
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}
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#endif
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if (cfg->use_global_ca_store == true) {
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esp_err_t esp_ret = set_global_ca_store(tls);
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if (esp_ret != ESP_OK) {
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return esp_ret;
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}
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} else if (cfg->cacert_pem_buf != NULL) {
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esp_err_t esp_ret = set_ca_cert(tls, cfg->cacert_pem_buf, cfg->cacert_pem_bytes);
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if (esp_ret != ESP_OK) {
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return esp_ret;
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}
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} else {
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mbedtls_ssl_conf_authmode(&tls->conf, MBEDTLS_SSL_VERIFY_NONE);
|
|
}
|
|
|
|
if (cfg->clientcert_pem_buf != NULL && cfg->clientkey_pem_buf != NULL) {
|
|
esp_tls_pki_t pki = {
|
|
.public_cert = &tls->clientcert,
|
|
.pk_key = &tls->clientkey,
|
|
.publiccert_pem_buf = cfg->clientcert_pem_buf,
|
|
.publiccert_pem_bytes = cfg->clientcert_pem_bytes,
|
|
.privkey_pem_buf = cfg->clientkey_pem_buf,
|
|
.privkey_pem_bytes = cfg->clientkey_pem_bytes,
|
|
.privkey_password = cfg->clientkey_password,
|
|
.privkey_password_len = cfg->clientkey_password_len,
|
|
};
|
|
esp_err_t esp_ret = set_pki_context(tls, &pki);
|
|
if (esp_ret != ESP_OK) {
|
|
ESP_LOGE(TAG, "Failed to set server pki context");
|
|
return esp_ret;
|
|
}
|
|
} else if (cfg->clientcert_pem_buf != NULL || cfg->clientkey_pem_buf != NULL) {
|
|
ESP_LOGE(TAG, "You have to provide both clientcert_pem_buf and clientkey_pem_buf for mutual authentication");
|
|
return ESP_ERR_INVALID_STATE;
|
|
}
|
|
return ESP_OK;
|
|
}
|
|
|
|
static esp_err_t create_ssl_handle(const char *hostname, size_t hostlen, const void *cfg, esp_tls_t *tls)
|
|
{
|
|
assert(cfg != NULL);
|
|
assert(tls != NULL);
|
|
int ret;
|
|
esp_err_t esp_ret;
|
|
tls->server_fd.fd = tls->sockfd;
|
|
mbedtls_ssl_init(&tls->ssl);
|
|
mbedtls_ctr_drbg_init(&tls->ctr_drbg);
|
|
mbedtls_ssl_config_init(&tls->conf);
|
|
mbedtls_entropy_init(&tls->entropy);
|
|
|
|
if (tls->role == ESP_TLS_CLIENT) {
|
|
esp_ret = set_client_config(hostname, hostlen, (esp_tls_cfg_t *)cfg, tls);
|
|
if (esp_ret != ESP_OK) {
|
|
ESP_LOGE(TAG, "Failed to set client configurations");
|
|
goto exit;
|
|
}
|
|
#ifdef CONFIG_ESP_TLS_SERVER
|
|
} else if (tls->role == ESP_TLS_SERVER) {
|
|
esp_ret = set_server_config((esp_tls_cfg_server_t *) cfg, tls);
|
|
if (esp_ret != 0) {
|
|
ESP_LOGE(TAG, "Failed to set server configurations");
|
|
goto exit;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
if ((ret = mbedtls_ctr_drbg_seed(&tls->ctr_drbg,
|
|
mbedtls_entropy_func, &tls->entropy, NULL, 0)) != 0) {
|
|
ESP_LOGE(TAG, "mbedtls_ctr_drbg_seed returned -0x%x", -ret);
|
|
ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ERR_TYPE_MBEDTLS, -ret);
|
|
esp_ret = ESP_ERR_MBEDTLS_CTR_DRBG_SEED_FAILED;
|
|
goto exit;
|
|
}
|
|
|
|
mbedtls_ssl_conf_rng(&tls->conf, mbedtls_ctr_drbg_random, &tls->ctr_drbg);
|
|
|
|
#ifdef CONFIG_MBEDTLS_DEBUG
|
|
mbedtls_esp_enable_debug_log(&tls->conf, CONFIG_MBEDTLS_DEBUG_LEVEL);
|
|
#endif
|
|
|
|
if ((ret = mbedtls_ssl_setup(&tls->ssl, &tls->conf)) != 0) {
|
|
ESP_LOGE(TAG, "mbedtls_ssl_setup returned -0x%x", -ret);
|
|
ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ERR_TYPE_MBEDTLS, -ret);
|
|
esp_ret = ESP_ERR_MBEDTLS_SSL_SETUP_FAILED;
|
|
goto exit;
|
|
}
|
|
mbedtls_ssl_set_bio(&tls->ssl, &tls->server_fd, mbedtls_net_send, mbedtls_net_recv, NULL);
|
|
|
|
return ESP_OK;
|
|
exit:
|
|
mbedtls_cleanup(tls);
|
|
return esp_ret;
|
|
}
|
|
|
|
/**
|
|
* @brief Close the TLS connection and free any allocated resources.
|
|
*/
|
|
void esp_tls_conn_delete(esp_tls_t *tls)
|
|
{
|
|
if (tls != NULL) {
|
|
mbedtls_cleanup(tls);
|
|
if (tls->is_tls) {
|
|
mbedtls_net_free(&tls->server_fd);
|
|
} else if (tls->sockfd >= 0) {
|
|
close(tls->sockfd);
|
|
}
|
|
free(tls->error_handle);
|
|
free(tls);
|
|
}
|
|
};
|
|
|
|
static ssize_t tcp_write(esp_tls_t *tls, const char *data, size_t datalen)
|
|
{
|
|
return send(tls->sockfd, data, datalen, 0);
|
|
}
|
|
|
|
static ssize_t tls_write(esp_tls_t *tls, const char *data, size_t datalen)
|
|
{
|
|
ssize_t ret = mbedtls_ssl_write(&tls->ssl, (unsigned char*) data, datalen);
|
|
if (ret < 0) {
|
|
if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
|
|
ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ERR_TYPE_MBEDTLS, -ret);
|
|
ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ERR_TYPE_ESP, ESP_ERR_MBEDTLS_SSL_WRITE_FAILED);
|
|
ESP_LOGE(TAG, "write error :%d:", ret);
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int esp_tls_low_level_conn(const char *hostname, int hostlen, int port, const esp_tls_cfg_t *cfg, esp_tls_t *tls)
|
|
{
|
|
if (!tls) {
|
|
ESP_LOGE(TAG, "empty esp_tls parameter");
|
|
return -1;
|
|
}
|
|
esp_err_t esp_ret;
|
|
int ret;
|
|
|
|
/* These states are used to keep a tab on connection progress in case of non-blocking connect,
|
|
and in case of blocking connect these cases will get executed one after the other */
|
|
switch (tls->conn_state) {
|
|
case ESP_TLS_INIT:
|
|
tls->sockfd = -1;
|
|
if (cfg != NULL) {
|
|
mbedtls_net_init(&tls->server_fd);
|
|
tls->is_tls = true;
|
|
}
|
|
if ((esp_ret = esp_tcp_connect(hostname, hostlen, port, &tls->sockfd, tls, cfg)) != ESP_OK) {
|
|
ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ERR_TYPE_ESP, esp_ret);
|
|
return -1;
|
|
}
|
|
if (!cfg) {
|
|
tls->read = tcp_read;
|
|
tls->write = tcp_write;
|
|
ESP_LOGD(TAG, "non-tls connection established");
|
|
return 1;
|
|
}
|
|
if (cfg->non_block) {
|
|
FD_ZERO(&tls->rset);
|
|
FD_SET(tls->sockfd, &tls->rset);
|
|
tls->wset = tls->rset;
|
|
}
|
|
tls->conn_state = ESP_TLS_CONNECTING;
|
|
/* falls through */
|
|
case ESP_TLS_CONNECTING:
|
|
if (cfg->non_block) {
|
|
ESP_LOGD(TAG, "connecting...");
|
|
struct timeval tv;
|
|
ms_to_timeval(cfg->timeout_ms, &tv);
|
|
|
|
/* In case of non-blocking I/O, we use the select() API to check whether
|
|
connection has been estbalished or not*/
|
|
if (select(tls->sockfd + 1, &tls->rset, &tls->wset, NULL,
|
|
cfg->timeout_ms ? &tv : NULL) == 0) {
|
|
ESP_LOGD(TAG, "select() timed out");
|
|
return 0;
|
|
}
|
|
if (FD_ISSET(tls->sockfd, &tls->rset) || FD_ISSET(tls->sockfd, &tls->wset)) {
|
|
int error;
|
|
unsigned int len = sizeof(error);
|
|
/* pending error check */
|
|
if (getsockopt(tls->sockfd, SOL_SOCKET, SO_ERROR, &error, &len) < 0) {
|
|
ESP_LOGD(TAG, "Non blocking connect failed");
|
|
ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ERR_TYPE_SYSTEM, errno);
|
|
ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ERR_TYPE_ESP, ESP_ERR_ESP_TLS_SOCKET_SETOPT_FAILED);
|
|
tls->conn_state = ESP_TLS_FAIL;
|
|
return -1;
|
|
}
|
|
}
|
|
}
|
|
/* By now, the connection has been established */
|
|
esp_ret = create_ssl_handle(hostname, hostlen, cfg, tls);
|
|
if (esp_ret != ESP_OK) {
|
|
ESP_LOGE(TAG, "create_ssl_handle failed");
|
|
ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ERR_TYPE_ESP, esp_ret);
|
|
tls->conn_state = ESP_TLS_FAIL;
|
|
return -1;
|
|
}
|
|
tls->read = tls_read;
|
|
tls->write = tls_write;
|
|
tls->conn_state = ESP_TLS_HANDSHAKE;
|
|
/* falls through */
|
|
case ESP_TLS_HANDSHAKE:
|
|
ESP_LOGD(TAG, "handshake in progress...");
|
|
ret = mbedtls_ssl_handshake(&tls->ssl);
|
|
if (ret == 0) {
|
|
tls->conn_state = ESP_TLS_DONE;
|
|
return 1;
|
|
} else {
|
|
if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
|
|
ESP_LOGE(TAG, "mbedtls_ssl_handshake returned -0x%x", -ret);
|
|
ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ERR_TYPE_MBEDTLS, -ret);
|
|
ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ERR_TYPE_ESP, ESP_ERR_MBEDTLS_SSL_HANDSHAKE_FAILED);
|
|
if (cfg->cacert_pem_buf != NULL || cfg->use_global_ca_store == true) {
|
|
/* This is to check whether handshake failed due to invalid certificate*/
|
|
verify_certificate(tls);
|
|
}
|
|
tls->conn_state = ESP_TLS_FAIL;
|
|
return -1;
|
|
}
|
|
/* Irrespective of blocking or non-blocking I/O, we return on getting MBEDTLS_ERR_SSL_WANT_READ
|
|
or MBEDTLS_ERR_SSL_WANT_WRITE during handshake */
|
|
return 0;
|
|
}
|
|
break;
|
|
case ESP_TLS_FAIL:
|
|
ESP_LOGE(TAG, "failed to open a new connection");;
|
|
break;
|
|
default:
|
|
ESP_LOGE(TAG, "invalid esp-tls state");
|
|
break;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
/**
|
|
* @brief Create a new TLS/SSL connection
|
|
*/
|
|
esp_tls_t *esp_tls_conn_new(const char *hostname, int hostlen, int port, const esp_tls_cfg_t *cfg)
|
|
{
|
|
esp_tls_t *tls = (esp_tls_t *)calloc(1, sizeof(esp_tls_t));
|
|
if (!tls) {
|
|
return NULL;
|
|
}
|
|
/* esp_tls_conn_new() API establishes connection in a blocking manner thus this loop ensures that esp_tls_conn_new()
|
|
API returns only after connection is established unless there is an error*/
|
|
while (1) {
|
|
int ret = esp_tls_low_level_conn(hostname, hostlen, port, cfg, tls);
|
|
if (ret == 1) {
|
|
return tls;
|
|
} else if (ret == -1) {
|
|
esp_tls_conn_delete(tls);
|
|
ESP_LOGE(TAG, "Failed to open new connection");
|
|
return NULL;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
int esp_tls_conn_new_sync(const char *hostname, int hostlen, int port, const esp_tls_cfg_t *cfg, esp_tls_t *tls)
|
|
{
|
|
/* esp_tls_conn_new_sync() is a sync alternative to esp_tls_conn_new_async() with symetric function prototype
|
|
it is an alternative to esp_tls_conn_new() which is left for compatibility reasons */
|
|
while (1) {
|
|
int ret = esp_tls_low_level_conn(hostname, hostlen, port, cfg, tls);
|
|
if (ret == 1) {
|
|
return ret;
|
|
} else if (ret == -1) {
|
|
ESP_LOGE(TAG, "Failed to open new connection");
|
|
return -1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* @brief Create a new TLS/SSL non-blocking connection
|
|
*/
|
|
int esp_tls_conn_new_async(const char *hostname, int hostlen, int port, const esp_tls_cfg_t *cfg , esp_tls_t *tls)
|
|
{
|
|
return esp_tls_low_level_conn(hostname, hostlen, port, cfg, tls);
|
|
}
|
|
|
|
static int get_port(const char *url, struct http_parser_url *u)
|
|
{
|
|
if (u->field_data[UF_PORT].len) {
|
|
return strtol(&url[u->field_data[UF_PORT].off], NULL, 10);
|
|
} else {
|
|
if (strncasecmp(&url[u->field_data[UF_SCHEMA].off], "http", u->field_data[UF_SCHEMA].len) == 0) {
|
|
return 80;
|
|
} else if (strncasecmp(&url[u->field_data[UF_SCHEMA].off], "https", u->field_data[UF_SCHEMA].len) == 0) {
|
|
return 443;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* @brief Create a new TLS/SSL connection with a given "HTTP" url
|
|
*/
|
|
esp_tls_t *esp_tls_conn_http_new(const char *url, const esp_tls_cfg_t *cfg)
|
|
{
|
|
/* Parse URI */
|
|
struct http_parser_url u;
|
|
http_parser_url_init(&u);
|
|
http_parser_parse_url(url, strlen(url), 0, &u);
|
|
esp_tls_t *tls = esp_tls_init();
|
|
if (!tls) return NULL;
|
|
/* Connect to host */
|
|
if (esp_tls_conn_new_sync(&url[u.field_data[UF_HOST].off], u.field_data[UF_HOST].len,
|
|
get_port(url, &u), cfg, tls) == 1) {
|
|
return tls;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
ssize_t esp_tls_get_bytes_avail(esp_tls_t *tls)
|
|
{
|
|
if (!tls) {
|
|
ESP_LOGE(TAG, "empty arg passed to esp_tls_get_bytes_avail()");
|
|
return -1;
|
|
}
|
|
return mbedtls_ssl_get_bytes_avail(&tls->ssl);
|
|
}
|
|
|
|
/**
|
|
* @brief Create a new non-blocking TLS/SSL connection with a given "HTTP" url
|
|
*/
|
|
int esp_tls_conn_http_new_async(const char *url, const esp_tls_cfg_t *cfg, esp_tls_t *tls)
|
|
{
|
|
/* Parse URI */
|
|
struct http_parser_url u;
|
|
http_parser_url_init(&u);
|
|
http_parser_parse_url(url, strlen(url), 0, &u);
|
|
|
|
/* Connect to host */
|
|
return esp_tls_conn_new_async(&url[u.field_data[UF_HOST].off], u.field_data[UF_HOST].len,
|
|
get_port(url, &u), cfg, tls);
|
|
}
|
|
|
|
#ifdef CONFIG_ESP_TLS_SERVER
|
|
/**
|
|
* @brief Create TLS/SSL server session
|
|
*/
|
|
int esp_tls_server_session_create(esp_tls_cfg_server_t *cfg, int sockfd, esp_tls_t *tls)
|
|
{
|
|
if (tls == NULL || cfg == NULL) {
|
|
return -1;
|
|
}
|
|
tls->role = ESP_TLS_SERVER;
|
|
tls->sockfd = sockfd;
|
|
esp_err_t esp_ret = create_ssl_handle(NULL, 0, cfg, tls);
|
|
if (esp_ret != ESP_OK) {
|
|
ESP_LOGE(TAG, "create_ssl_handle failed");
|
|
ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ERR_TYPE_ESP, esp_ret);
|
|
tls->conn_state = ESP_TLS_FAIL;
|
|
return -1;
|
|
}
|
|
tls->read = tls_read;
|
|
tls->write = tls_write;
|
|
int ret;
|
|
while ((ret = mbedtls_ssl_handshake(&tls->ssl)) != 0) {
|
|
if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
|
|
ESP_LOGE(TAG, "mbedtls_ssl_handshake returned %d", ret);
|
|
tls->conn_state = ESP_TLS_FAIL;
|
|
return ret;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
/**
|
|
* @brief Close the server side TLS/SSL connection and free any allocated resources.
|
|
*/
|
|
void esp_tls_server_session_delete(esp_tls_t *tls)
|
|
{
|
|
if (tls != NULL) {
|
|
mbedtls_cleanup(tls);
|
|
free(tls);
|
|
}
|
|
};
|
|
#endif /* ! CONFIG_ESP_TLS_SERVER */
|
|
|
|
esp_tls_t *esp_tls_init()
|
|
{
|
|
esp_tls_t *tls = (esp_tls_t *)calloc(1, sizeof(esp_tls_t));
|
|
if (!tls) {
|
|
return NULL;
|
|
}
|
|
tls->error_handle = calloc(1, sizeof(esp_tls_last_error_t));
|
|
if (!tls->error_handle) {
|
|
free(tls);
|
|
return NULL;
|
|
}
|
|
tls->server_fd.fd = tls->sockfd = -1;
|
|
return tls;
|
|
}
|
|
|
|
esp_err_t esp_tls_get_and_clear_last_error(esp_tls_error_handle_t h, int *mbedtls_code, int *mbedtls_flags)
|
|
{
|
|
if (!h) {
|
|
return ESP_ERR_INVALID_STATE;
|
|
}
|
|
esp_err_t last_err = h->last_error;
|
|
if (mbedtls_code) {
|
|
*mbedtls_code = h->mbedtls_error_code;
|
|
}
|
|
if (mbedtls_flags) {
|
|
*mbedtls_flags = h->mbedtls_flags;
|
|
}
|
|
memset(h, 0, sizeof(esp_tls_last_error_t));
|
|
return last_err;
|
|
}
|