esp-idf/components/tcp_transport/transport_ssl.c

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// Copyright 2015-2018 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <string.h>
#include <stdlib.h>
#include "esp_tls.h"
#include "esp_log.h"
#include "esp_transport.h"
#include "esp_transport_ssl.h"
#include "esp_transport_utils.h"
#include "esp_transport_internal.h"
#define INVALID_SOCKET (-1)
#define GET_SSL_FROM_TRANSPORT_OR_RETURN(ssl, t) \
transport_esp_tls_t *ssl = ssl_get_context_data(t); \
if (!ssl) { return; }
static const char *TAG = "TRANSPORT_BASE";
typedef enum {
TRANS_SSL_INIT = 0,
TRANS_SSL_CONNECTING,
} transport_ssl_conn_state_t;
/**
* mbedtls specific transport data
*/
typedef struct transport_esp_tls {
esp_tls_t *tls;
esp_tls_cfg_t cfg;
bool ssl_initialized;
transport_ssl_conn_state_t conn_state;
int sockfd;
} transport_esp_tls_t;
static inline struct transport_esp_tls * ssl_get_context_data(esp_transport_handle_t t)
{
if (!t) {
return NULL;
}
if (t->data) { // Prefer internal ssl context (independent from the list)
return (transport_esp_tls_t*)t->data;
}
if (t->base && t->base->transport_esp_tls) { // Next one is the lists inherent context
t->data = t->base->transport_esp_tls; // Optimize: if we have base context, use it as internal
return t->base->transport_esp_tls;
}
// If we don't have a valid context, let's to create one
transport_esp_tls_t *ssl = esp_transport_esp_tls_create();
ESP_TRANSPORT_MEM_CHECK(TAG, ssl, return NULL)
t->data = ssl;
return ssl;
}
static int esp_tls_connect_async(esp_transport_handle_t t, const char *host, int port, int timeout_ms, bool is_plain_tcp)
{
transport_esp_tls_t *ssl = ssl_get_context_data(t);
if (ssl->conn_state == TRANS_SSL_INIT) {
ssl->cfg.timeout_ms = timeout_ms;
ssl->cfg.is_plain_tcp = is_plain_tcp;
ssl->cfg.non_block = true;
ssl->ssl_initialized = true;
ssl->tls = esp_tls_init();
if (!ssl->tls) {
return -1;
}
ssl->conn_state = TRANS_SSL_CONNECTING;
ssl->sockfd = INVALID_SOCKET;
}
if (ssl->conn_state == TRANS_SSL_CONNECTING) {
int progress = esp_tls_conn_new_async(host, strlen(host), port, &ssl->cfg, ssl->tls);
if (progress >= 0) {
ssl->sockfd = ssl->tls->sockfd;
}
return progress;
}
return 0;
}
static inline int ssl_connect_async(esp_transport_handle_t t, const char *host, int port, int timeout_ms)
{
return esp_tls_connect_async(t, host, port, timeout_ms, false);
}
static inline int tcp_connect_async(esp_transport_handle_t t, const char *host, int port, int timeout_ms)
{
return esp_tls_connect_async(t, host, port, timeout_ms, true);
}
static int ssl_connect(esp_transport_handle_t t, const char *host, int port, int timeout_ms)
{
transport_esp_tls_t *ssl = ssl_get_context_data(t);
ssl->cfg.timeout_ms = timeout_ms;
ssl->cfg.is_plain_tcp = false;
ssl->ssl_initialized = true;
ssl->tls = esp_tls_init();
if (ssl->tls == NULL) {
ESP_LOGE(TAG, "Failed to initialize new connection object");
capture_tcp_transport_error(t, ERR_TCP_TRANSPORT_NO_MEM);
return -1;
}
if (esp_tls_conn_new_sync(host, strlen(host), port, &ssl->cfg, ssl->tls) <= 0) {
ESP_LOGE(TAG, "Failed to open a new connection");
esp_transport_set_errors(t, ssl->tls->error_handle);
esp_tls_conn_destroy(ssl->tls);
ssl->tls = NULL;
ssl->sockfd = INVALID_SOCKET;
return -1;
}
ssl->sockfd = ssl->tls->sockfd;
return 0;
}
static int tcp_connect(esp_transport_handle_t t, const char *host, int port, int timeout_ms)
{
transport_esp_tls_t *ssl = ssl_get_context_data(t);
esp_tls_last_error_t *err_handle = esp_transport_get_error_handle(t);
ssl->cfg.timeout_ms = timeout_ms;
esp_err_t err = esp_tls_plain_tcp_connect(host, strlen(host), port, &ssl->cfg, err_handle, &ssl->sockfd);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to open a new connection: %d", err);
err_handle->last_error = err;
ssl->sockfd = INVALID_SOCKET;
return -1;
}
return 0;
}
static int base_poll_read(esp_transport_handle_t t, int timeout_ms)
{
transport_esp_tls_t *ssl = ssl_get_context_data(t);
int ret = -1;
int remain = 0;
struct timeval timeout;
fd_set readset;
fd_set errset;
FD_ZERO(&readset);
FD_ZERO(&errset);
FD_SET(ssl->sockfd, &readset);
FD_SET(ssl->sockfd, &errset);
if (ssl->tls && (remain = esp_tls_get_bytes_avail(ssl->tls)) > 0) {
ESP_LOGD(TAG, "remain data in cache, need to read again");
return remain;
}
ret = select(ssl->sockfd + 1, &readset, NULL, &errset, esp_transport_utils_ms_to_timeval(timeout_ms, &timeout));
if (ret > 0 && FD_ISSET(ssl->sockfd, &errset)) {
int sock_errno = 0;
uint32_t optlen = sizeof(sock_errno);
getsockopt(ssl->sockfd, SOL_SOCKET, SO_ERROR, &sock_errno, &optlen);
esp_transport_capture_errno(t, sock_errno);
ESP_LOGE(TAG, "poll_read select error %d, errno = %s, fd = %d", sock_errno, strerror(sock_errno), ssl->sockfd);
ret = -1;
}
return ret;
}
static int base_poll_write(esp_transport_handle_t t, int timeout_ms)
{
transport_esp_tls_t *ssl = ssl_get_context_data(t);
int ret = -1;
struct timeval timeout;
fd_set writeset;
fd_set errset;
FD_ZERO(&writeset);
FD_ZERO(&errset);
FD_SET(ssl->sockfd, &writeset);
FD_SET(ssl->sockfd, &errset);
ret = select(ssl->sockfd + 1, NULL, &writeset, &errset, esp_transport_utils_ms_to_timeval(timeout_ms, &timeout));
if (ret > 0 && FD_ISSET(ssl->sockfd, &errset)) {
int sock_errno = 0;
uint32_t optlen = sizeof(sock_errno);
getsockopt(ssl->sockfd, SOL_SOCKET, SO_ERROR, &sock_errno, &optlen);
esp_transport_capture_errno(t, sock_errno);
ESP_LOGE(TAG, "poll_write select error %d, errno = %s, fd = %d", sock_errno, strerror(sock_errno), ssl->sockfd);
ret = -1;
}
return ret;
}
static int ssl_write(esp_transport_handle_t t, const char *buffer, int len, int timeout_ms)
{
int poll;
transport_esp_tls_t *ssl = ssl_get_context_data(t);
if ((poll = esp_transport_poll_write(t, timeout_ms)) <= 0) {
ESP_LOGW(TAG, "Poll timeout or error, errno=%s, fd=%d, timeout_ms=%d", strerror(errno), ssl->sockfd, timeout_ms);
return poll;
}
int ret = esp_tls_conn_write(ssl->tls, (const unsigned char *) buffer, len);
if (ret < 0) {
ESP_LOGE(TAG, "esp_tls_conn_write error, errno=%s", strerror(errno));
esp_transport_set_errors(t, ssl->tls->error_handle);
}
return ret;
}
static int tcp_write(esp_transport_handle_t t, const char *buffer, int len, int timeout_ms)
{
int poll;
transport_esp_tls_t *ssl = ssl_get_context_data(t);
if ((poll = esp_transport_poll_write(t, timeout_ms)) <= 0) {
ESP_LOGW(TAG, "Poll timeout or error, errno=%s, fd=%d, timeout_ms=%d", strerror(errno), ssl->sockfd, timeout_ms);
return poll;
}
int ret = send(ssl->sockfd,(const unsigned char *) buffer, len, 0);
if (ret < 0) {
ESP_LOGE(TAG, "tcp_write error, errno=%s", strerror(errno));
esp_transport_capture_errno(t, errno);
}
return ret;
}
static int ssl_read(esp_transport_handle_t t, char *buffer, int len, int timeout_ms)
{
int poll;
transport_esp_tls_t *ssl = ssl_get_context_data(t);
if ((poll = esp_transport_poll_read(t, timeout_ms)) <= 0) {
return poll;
}
int ret = esp_tls_conn_read(ssl->tls, (unsigned char *)buffer, len);
if (ret < 0) {
ESP_LOGE(TAG, "esp_tls_conn_read error, errno=%s", strerror(errno));
esp_transport_set_errors(t, ssl->tls->error_handle);
}
if (ret == 0) {
if (poll > 0) {
// no error, socket reads 0 while previously detected as readable -> connection has been closed cleanly
capture_tcp_transport_error(t, ERR_TCP_TRANSPORT_CONNECTION_CLOSED_BY_FIN);
}
ret = -1;
}
return ret;
}
static int tcp_read(esp_transport_handle_t t, char *buffer, int len, int timeout_ms)
{
int poll;
transport_esp_tls_t *ssl = ssl_get_context_data(t);
if ((poll = esp_transport_poll_read(t, timeout_ms)) <= 0) {
return poll;
}
int ret = recv(ssl->sockfd, (unsigned char *)buffer, len, 0);
if (ret < 0) {
ESP_LOGE(TAG, "tcp_read error, errno=%s", strerror(errno));
esp_transport_capture_errno(t, errno);
}
if (ret == 0) {
if (poll > 0) {
// no error, socket reads 0 while previously detected as readable -> connection has been closed cleanly
capture_tcp_transport_error(t, ERR_TCP_TRANSPORT_CONNECTION_CLOSED_BY_FIN);
}
ret = -1;
}
return ret;
}
static int base_close(esp_transport_handle_t t)
{
int ret = -1;
transport_esp_tls_t *ssl = ssl_get_context_data(t);
if (ssl && ssl->ssl_initialized) {
ret = esp_tls_conn_destroy(ssl->tls);
ssl->tls = NULL;
ssl->conn_state = TRANS_SSL_INIT;
ssl->ssl_initialized = false;
ssl->sockfd = INVALID_SOCKET;
} else if (ssl && ssl->sockfd >= 0) {
close(ssl->sockfd);
ssl->sockfd = INVALID_SOCKET;
}
return ret;
}
static int base_destroy(esp_transport_handle_t t)
{
transport_esp_tls_t *ssl = ssl_get_context_data(t);
if (ssl) {
esp_transport_close(t);
if (t->base && t->base->transport_esp_tls &&
t->data == t->base->transport_esp_tls) {
// if internal ssl the same as the foundation transport,
// just zero out, it will be freed on list destroy
t->data = NULL;
}
esp_transport_esp_tls_destroy(t->data); // okay to pass NULL
}
return 0;
}
void esp_transport_ssl_enable_global_ca_store(esp_transport_handle_t t)
{
GET_SSL_FROM_TRANSPORT_OR_RETURN(ssl, t);
ssl->cfg.use_global_ca_store = true;
}
#ifdef CONFIG_ESP_TLS_PSK_VERIFICATION
void esp_transport_ssl_set_psk_key_hint(esp_transport_handle_t t, const psk_hint_key_t* psk_hint_key)
{
GET_SSL_FROM_TRANSPORT_OR_RETURN(ssl, t);
ssl->cfg.psk_hint_key = psk_hint_key;
}
#endif
void esp_transport_ssl_set_cert_data(esp_transport_handle_t t, const char *data, int len)
{
GET_SSL_FROM_TRANSPORT_OR_RETURN(ssl, t);
ssl->cfg.cacert_pem_buf = (void *)data;
ssl->cfg.cacert_pem_bytes = len + 1;
}
void esp_transport_ssl_set_cert_data_der(esp_transport_handle_t t, const char *data, int len)
{
GET_SSL_FROM_TRANSPORT_OR_RETURN(ssl, t);
ssl->cfg.cacert_buf = (void *)data;
ssl->cfg.cacert_bytes = len;
}
void esp_transport_ssl_set_client_cert_data(esp_transport_handle_t t, const char *data, int len)
{
GET_SSL_FROM_TRANSPORT_OR_RETURN(ssl, t);
ssl->cfg.clientcert_pem_buf = (void *)data;
ssl->cfg.clientcert_pem_bytes = len + 1;
}
void esp_transport_ssl_set_client_cert_data_der(esp_transport_handle_t t, const char *data, int len)
{
GET_SSL_FROM_TRANSPORT_OR_RETURN(ssl, t);
ssl->cfg.clientcert_buf = (void *)data;
ssl->cfg.clientcert_bytes = len;
}
void esp_transport_ssl_set_client_key_data(esp_transport_handle_t t, const char *data, int len)
{
GET_SSL_FROM_TRANSPORT_OR_RETURN(ssl, t);
ssl->cfg.clientkey_pem_buf = (void *)data;
ssl->cfg.clientkey_pem_bytes = len + 1;
}
void esp_transport_ssl_set_client_key_password(esp_transport_handle_t t, const char *password, int password_len)
{
GET_SSL_FROM_TRANSPORT_OR_RETURN(ssl, t);
ssl->cfg.clientkey_password = (void *)password;
ssl->cfg.clientkey_password_len = password_len;
}
void esp_transport_ssl_set_client_key_data_der(esp_transport_handle_t t, const char *data, int len)
{
GET_SSL_FROM_TRANSPORT_OR_RETURN(ssl, t);
ssl->cfg.clientkey_buf = (void *)data;
ssl->cfg.clientkey_bytes = len;
}
#if defined(CONFIG_MBEDTLS_SSL_ALPN) || defined(CONFIG_WOLFSSL_HAVE_ALPN)
void esp_transport_ssl_set_alpn_protocol(esp_transport_handle_t t, const char **alpn_protos)
{
GET_SSL_FROM_TRANSPORT_OR_RETURN(ssl, t);
ssl->cfg.alpn_protos = alpn_protos;
}
#endif
void esp_transport_ssl_skip_common_name_check(esp_transport_handle_t t)
{
GET_SSL_FROM_TRANSPORT_OR_RETURN(ssl, t);
ssl->cfg.skip_common_name = true;
}
#ifdef CONFIG_ESP_TLS_USE_SECURE_ELEMENT
void esp_transport_ssl_use_secure_element(esp_transport_handle_t t)
{
GET_SSL_FROM_TRANSPORT_OR_RETURN(ssl, t);
ssl->cfg.use_secure_element = true;
}
#endif
#ifdef CONFIG_MBEDTLS_CERTIFICATE_BUNDLE
void esp_transport_ssl_crt_bundle_attach(esp_transport_handle_t t, esp_err_t ((*crt_bundle_attach)(void *conf)))
{
GET_SSL_FROM_TRANSPORT_OR_RETURN(ssl, t);
ssl->cfg.crt_bundle_attach = crt_bundle_attach;
}
#endif
static int base_get_socket(esp_transport_handle_t t)
{
transport_esp_tls_t *ctx = ssl_get_context_data(t);
if (ctx) {
return ctx->sockfd;
}
return INVALID_SOCKET;
}
#ifdef CONFIG_ESP_TLS_USE_DS_PERIPHERAL
void esp_transport_ssl_set_ds_data(esp_transport_handle_t t, void *ds_data)
{
GET_SSL_FROM_TRANSPORT_OR_RETURN(ssl, t);
ssl->cfg.ds_data = ds_data;
}
#endif
void esp_transport_ssl_set_keep_alive(esp_transport_handle_t t, esp_transport_keep_alive_t *keep_alive_cfg)
{
GET_SSL_FROM_TRANSPORT_OR_RETURN(ssl, t);
ssl->cfg.keep_alive_cfg = (tls_keep_alive_cfg_t *) keep_alive_cfg;
}
void esp_transport_ssl_set_interface_name(esp_transport_handle_t t, struct ifreq *if_name)
{
GET_SSL_FROM_TRANSPORT_OR_RETURN(ssl, t);
ssl->cfg.if_name = if_name;
}
esp_transport_handle_t esp_transport_ssl_init(void)
{
esp_transport_handle_t t = esp_transport_init();
if (t == NULL) {
return NULL;
}
esp_transport_set_func(t, ssl_connect, ssl_read, ssl_write, base_close, base_poll_read, base_poll_write, base_destroy);
esp_transport_set_async_connect_func(t, ssl_connect_async);
t->_get_socket = base_get_socket;
return t;
}
struct transport_esp_tls* esp_transport_esp_tls_create(void)
{
transport_esp_tls_t *transport_esp_tls = calloc(1, sizeof(transport_esp_tls_t));
if (transport_esp_tls == NULL) {
return NULL;
}
transport_esp_tls->sockfd = INVALID_SOCKET;
return transport_esp_tls;
}
void esp_transport_esp_tls_destroy(struct transport_esp_tls* transport_esp_tls)
{
free(transport_esp_tls);
}
esp_transport_handle_t esp_transport_tcp_init(void)
{
esp_transport_handle_t t = esp_transport_init();
if (t == NULL) {
return NULL;
}
esp_transport_set_func(t, tcp_connect, tcp_read, tcp_write, base_close, base_poll_read, base_poll_write, base_destroy);
esp_transport_set_async_connect_func(t, tcp_connect_async);
t->_get_socket = base_get_socket;
return t;
}
void esp_transport_tcp_set_keep_alive(esp_transport_handle_t t, esp_transport_keep_alive_t *keep_alive_cfg)
{
return esp_transport_ssl_set_keep_alive(t, keep_alive_cfg);
}
void esp_transport_tcp_set_interface_name(esp_transport_handle_t t, struct ifreq *if_name)
{
return esp_transport_ssl_set_interface_name(t, if_name);
}