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esp-idf/components/esp-tls/esp_tls_wolfssl.c
Aditya Patwardhan 788c9ddf8d esp_tls: Added getter function for esp_tls ssl ctx.
2022-05-11 07:09:34 +00:00

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/*
* SPDX-FileCopyrightText: 2019-2021 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <http_parser.h>
#include "esp_tls_wolfssl.h"
#include "esp_tls_error_capture_internal.h"
#include <errno.h>
#include "esp_log.h"
static unsigned char *global_cacert = NULL;
static unsigned int global_cacert_pem_bytes = 0;
static const char *TAG = "esp-tls-wolfssl";
/* Prototypes for the static functions */
static esp_err_t set_client_config(const char *hostname, size_t hostlen, esp_tls_cfg_t *cfg, esp_tls_t *tls);
#if defined(CONFIG_ESP_TLS_PSK_VERIFICATION)
#include "freertos/semphr.h"
static SemaphoreHandle_t tls_conn_lock;
static inline unsigned int esp_wolfssl_psk_client_cb(WOLFSSL* ssl, const char* hint, char* identity,
unsigned int id_max_len, unsigned char* key,unsigned int key_max_len);
static esp_err_t esp_wolfssl_set_cipher_list(WOLFSSL_CTX *ctx);
#ifdef WOLFSSL_TLS13
#define PSK_MAX_ID_LEN 128
#else
#define PSK_MAX_ID_LEN 64
#endif
#define PSK_MAX_KEY_LEN 64
static char psk_id_str[PSK_MAX_ID_LEN];
static uint8_t psk_key_array[PSK_MAX_KEY_LEN];
static uint8_t psk_key_max_len = 0;
#endif /* CONFIG_ESP_TLS_PSK_VERIFICATION */
#ifdef CONFIG_ESP_TLS_SERVER
static esp_err_t set_server_config(esp_tls_cfg_server_t *cfg, esp_tls_t *tls);
#endif /* CONFIG_ESP_TLS_SERVER */
/* This function shall return the error message when appropriate log level has been set otherwise this function shall do nothing */
static void wolfssl_print_error_msg(int error)
{
#if (CONFIG_LOG_DEFAULT_LEVEL_DEBUG || CONFIG_LOG_DEFAULT_LEVEL_VERBOSE)
static char error_buf[100];
ESP_LOGE(TAG, "(%d) : %s", error, ERR_error_string(error, error_buf));
#endif
}
typedef enum x509_file_type {
FILE_TYPE_CA_CERT = 0, /* CA certificate to authenticate entity at other end */
FILE_TYPE_SELF_CERT, /* Self certificate of the entity */
FILE_TYPE_SELF_KEY, /* Private key in the self cert-key pair */
} x509_file_type_t;
/* Error type conversion utility so that esp-tls read/write API to return negative number on error */
static inline ssize_t esp_tls_convert_wolfssl_err_to_ssize(int wolfssl_error)
{
switch (wolfssl_error) {
case WOLFSSL_ERROR_WANT_READ:
return ESP_TLS_ERR_SSL_WANT_READ;
case WOLFSSL_ERROR_WANT_WRITE:
return ESP_TLS_ERR_SSL_WANT_WRITE;
default:
// Make sure we return a negative number
return wolfssl_error>0 ? -wolfssl_error: wolfssl_error;
}
}
/* Checks whether the certificate provided is in pem format or not */
static esp_err_t esp_load_wolfssl_verify_buffer(esp_tls_t *tls, const unsigned char *cert_buf, unsigned int cert_len, x509_file_type_t type, int *err_ret)
{
int wolf_fileformat = WOLFSSL_FILETYPE_DEFAULT;
if (type == FILE_TYPE_SELF_KEY) {
if (cert_buf[cert_len - 1] == '\0' && strstr( (const char *) cert_buf, "-----BEGIN " )) {
wolf_fileformat = WOLFSSL_FILETYPE_PEM;
} else {
wolf_fileformat = WOLFSSL_FILETYPE_ASN1;
}
if ((*err_ret = wolfSSL_CTX_use_PrivateKey_buffer( (WOLFSSL_CTX *)tls->priv_ctx, cert_buf, cert_len, wolf_fileformat)) == WOLFSSL_SUCCESS) {
return ESP_OK;
}
return ESP_FAIL;
} else {
if (cert_buf[cert_len - 1] == '\0' && strstr( (const char *) cert_buf, "-----BEGIN CERTIFICATE-----" )) {
wolf_fileformat = WOLFSSL_FILETYPE_PEM;
} else {
wolf_fileformat = WOLFSSL_FILETYPE_ASN1;
}
if (type == FILE_TYPE_SELF_CERT) {
if ((*err_ret = wolfSSL_CTX_use_certificate_buffer( (WOLFSSL_CTX *)tls->priv_ctx, cert_buf, cert_len, wolf_fileformat)) == WOLFSSL_SUCCESS) {
return ESP_OK;
}
return ESP_FAIL;
} else if (type == FILE_TYPE_CA_CERT) {
if ((*err_ret = wolfSSL_CTX_load_verify_buffer( (WOLFSSL_CTX *)tls->priv_ctx, cert_buf, cert_len, wolf_fileformat)) == WOLFSSL_SUCCESS) {
return ESP_OK;
}
return ESP_FAIL;
} else {
/* Wrong file type provided */
return ESP_FAIL;
}
}
}
void *esp_wolfssl_get_ssl_context(esp_tls_t *tls)
{
if (tls == NULL) {
ESP_LOGE(TAG, "Invalid arguments");
return NULL;
}
return (void*)tls->priv_ssl;
}
esp_err_t esp_create_wolfssl_handle(const char *hostname, size_t hostlen, const void *cfg, esp_tls_t *tls)
{
#ifdef CONFIG_ESP_DEBUG_WOLFSSL
wolfSSL_Debugging_ON();
#endif
assert(cfg != NULL);
assert(tls != NULL);
esp_err_t esp_ret = ESP_FAIL;
int ret;
ret = wolfSSL_Init();
if (ret != WOLFSSL_SUCCESS) {
ESP_LOGE(TAG, "Init wolfSSL failed: 0x%04X", ret);
wolfssl_print_error_msg(ret);
int err = wolfSSL_get_error( (WOLFSSL *)tls->priv_ssl, ret);
ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ESP_TLS_ERR_TYPE_WOLFSSL, err);
goto exit;
}
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, [0x%04X] (%s)", esp_ret, esp_err_to_name(esp_ret));
goto exit;
}
} else if (tls->role == ESP_TLS_SERVER) {
#ifdef CONFIG_ESP_TLS_SERVER
esp_ret = set_server_config((esp_tls_cfg_server_t *) cfg, tls);
if (esp_ret != ESP_OK) {
ESP_LOGE(TAG, "Failed to set server configurations, [0x%04X] (%s)", esp_ret, esp_err_to_name(esp_ret));
goto exit;
}
#else
ESP_LOGE(TAG, "ESP_TLS_SERVER Not enabled in menuconfig");
goto exit;
#endif
}
else {
ESP_LOGE(TAG, "tls->role is not valid");
goto exit;
}
return ESP_OK;
exit:
esp_wolfssl_cleanup(tls);
return esp_ret;
}
static esp_err_t set_client_config(const char *hostname, size_t hostlen, esp_tls_cfg_t *cfg, esp_tls_t *tls)
{
int ret = WOLFSSL_FAILURE;
#ifdef WOLFSSL_TLS13
tls->priv_ctx = (void *)wolfSSL_CTX_new(wolfTLSv1_3_client_method());
#else
tls->priv_ctx = (void *)wolfSSL_CTX_new(wolfTLSv1_2_client_method());
#endif
if (!tls->priv_ctx) {
ESP_LOGE(TAG, "Set wolfSSL ctx failed");
ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ESP_TLS_ERR_TYPE_WOLFSSL, ret);
return ESP_ERR_WOLFSSL_CTX_SETUP_FAILED;
}
if (cfg->crt_bundle_attach != NULL) {
ESP_LOGE(TAG,"use_crt_bundle not supported in wolfssl");
return ESP_FAIL;
}
if (cfg->use_global_ca_store == true) {
if ((esp_load_wolfssl_verify_buffer(tls, global_cacert, global_cacert_pem_bytes, FILE_TYPE_CA_CERT, &ret)) != ESP_OK) {
int err = wolfSSL_get_error( (WOLFSSL *)tls->priv_ssl, ret);
ESP_LOGE(TAG, "Error in loading certificate verify buffer, returned %d, error code: %d", ret, err);
wolfssl_print_error_msg(err);
return ESP_ERR_WOLFSSL_CERT_VERIFY_SETUP_FAILED;
}
wolfSSL_CTX_set_verify( (WOLFSSL_CTX *)tls->priv_ctx, WOLFSSL_VERIFY_PEER, NULL);
} else if (cfg->cacert_buf != NULL) {
if ((esp_load_wolfssl_verify_buffer(tls, cfg->cacert_buf, cfg->cacert_bytes, FILE_TYPE_CA_CERT, &ret)) != ESP_OK) {
int err = wolfSSL_get_error( (WOLFSSL *)tls->priv_ssl, ret);
ESP_LOGE(TAG, "Error in loading certificate verify buffer, returned %d, error code: %d", ret, err);
wolfssl_print_error_msg(err);
return ESP_ERR_WOLFSSL_CERT_VERIFY_SETUP_FAILED;
}
wolfSSL_CTX_set_verify( (WOLFSSL_CTX *)tls->priv_ctx, WOLFSSL_VERIFY_PEER, NULL);
} else if (cfg->psk_hint_key) {
#if defined(CONFIG_ESP_TLS_PSK_VERIFICATION)
/*** PSK encryption mode is configured only if no certificate supplied and psk pointer not null ***/
if(cfg->psk_hint_key->key == NULL || cfg->psk_hint_key->hint == NULL || cfg->psk_hint_key->key_size <= 0) {
ESP_LOGE(TAG, "Please provide appropriate key, keysize and hint to use PSK");
return ESP_FAIL;
}
/* mutex is given back when call back function executes or in case of failure (at cleanup) */
if ((xSemaphoreTake(tls_conn_lock, 1000/portTICK_PERIOD_MS) != pdTRUE)) {
ESP_LOGE(TAG, "tls_conn_lock could not be obtained in specified time");
return -1;
}
ESP_LOGI(TAG, "setting psk configurations");
if((cfg->psk_hint_key->key_size > PSK_MAX_KEY_LEN) || (strlen(cfg->psk_hint_key->hint) > PSK_MAX_ID_LEN)) {
ESP_LOGE(TAG, "psk key length should be <= %d and identity hint length should be <= %d", PSK_MAX_KEY_LEN, PSK_MAX_ID_LEN);
return ESP_ERR_INVALID_ARG;
}
psk_key_max_len = cfg->psk_hint_key->key_size;
memset(psk_key_array, 0, sizeof(psk_key_array));
memset(psk_id_str, 0, sizeof(psk_id_str));
memcpy(psk_key_array, cfg->psk_hint_key->key, psk_key_max_len);
memcpy(psk_id_str, cfg->psk_hint_key->hint, strlen(cfg->psk_hint_key->hint));
wolfSSL_CTX_set_psk_client_callback( (WOLFSSL_CTX *)tls->priv_ctx, esp_wolfssl_psk_client_cb);
if(esp_wolfssl_set_cipher_list( (WOLFSSL_CTX *)tls->priv_ctx) != ESP_OK) {
ESP_LOGE(TAG, "error in setting cipher-list");
return ESP_FAIL;
}
#else
ESP_LOGE(TAG, "psk_hint_key configured but not enabled in menuconfig: Please enable ESP_TLS_PSK_VERIFICATION option");
return ESP_ERR_INVALID_STATE;
#endif
} else {
#ifdef CONFIG_ESP_TLS_SKIP_SERVER_CERT_VERIFY
wolfSSL_CTX_set_verify( (WOLFSSL_CTX *)tls->priv_ctx, WOLFSSL_VERIFY_NONE, NULL);
#else
ESP_LOGE(TAG, "No server verification option set in esp_tls_cfg_t structure. Check esp_tls API reference");
return ESP_ERR_WOLFSSL_SSL_SETUP_FAILED;
#endif
}
if (cfg->clientcert_buf != NULL && cfg->clientkey_buf != NULL) {
if ((esp_load_wolfssl_verify_buffer(tls,cfg->clientcert_buf, cfg->clientcert_bytes, FILE_TYPE_SELF_CERT, &ret)) != ESP_OK) {
int err = wolfSSL_get_error( (WOLFSSL *)tls->priv_ssl, ret);
ESP_LOGE(TAG, "Error in loading certificate verify buffer, returned %d, error code: %d", ret, err);
wolfssl_print_error_msg(err);
return ESP_ERR_WOLFSSL_CERT_VERIFY_SETUP_FAILED;
}
if ((esp_load_wolfssl_verify_buffer(tls,cfg->clientkey_buf, cfg->clientkey_bytes, FILE_TYPE_SELF_KEY, &ret)) != ESP_OK) {
int err = wolfSSL_get_error( (WOLFSSL *)tls->priv_ssl, ret);
ESP_LOGE(TAG, "Error in loading private key verify buffer, returned %d, error code: %d", ret, err);
wolfssl_print_error_msg(err);
return ESP_ERR_WOLFSSL_CERT_VERIFY_SETUP_FAILED;
}
} else if (cfg->clientcert_buf != NULL || cfg->clientkey_buf != NULL) {
ESP_LOGE(TAG, "You have to provide both clientcert_buf and clientkey_buf for mutual authentication\n\n");
return ESP_FAIL;
}
tls->priv_ssl =(void *)wolfSSL_new( (WOLFSSL_CTX *)tls->priv_ctx);
if (!tls->priv_ssl) {
ESP_LOGE(TAG, "Create wolfSSL failed");
int err = wolfSSL_get_error( (WOLFSSL *)tls->priv_ssl, ret);
ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ESP_TLS_ERR_TYPE_WOLFSSL, err);
return ESP_ERR_WOLFSSL_SSL_SETUP_FAILED;
}
if (!cfg->skip_common_name) {
char *use_host = NULL;
if (cfg->common_name != NULL) {
use_host = strdup(cfg->common_name);
} else {
use_host = strndup(hostname, hostlen);
}
if (use_host == NULL) {
return ESP_ERR_NO_MEM;
}
/* Hostname set here should match CN in server certificate */
if ((ret = (wolfSSL_check_domain_name( (WOLFSSL *)tls->priv_ssl, use_host))) != WOLFSSL_SUCCESS) {
int err = wolfSSL_get_error( (WOLFSSL *)tls->priv_ssl, ret);
ESP_LOGE(TAG, "wolfSSL_check_domain_name returned %d, error code: %d", ret, err);
ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ESP_TLS_ERR_TYPE_WOLFSSL, err);
free(use_host);
return ESP_ERR_WOLFSSL_SSL_SET_HOSTNAME_FAILED;
}
free(use_host);
}
if (cfg->alpn_protos) {
#ifdef CONFIG_WOLFSSL_HAVE_ALPN
char **alpn_list = (char **)cfg->alpn_protos;
for (; *alpn_list != NULL; alpn_list ++) {
ESP_LOGD(TAG, "alpn protocol is %s", *alpn_list);
if ((ret = wolfSSL_UseALPN( (WOLFSSL *)tls->priv_ssl, *alpn_list, strlen(*alpn_list), WOLFSSL_ALPN_FAILED_ON_MISMATCH)) != WOLFSSL_SUCCESS) {
int err = wolfSSL_get_error( (WOLFSSL *)tls->priv_ssl, ret);
ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ESP_TLS_ERR_TYPE_WOLFSSL, err);
ESP_LOGE(TAG, "wolfSSL UseALPN failed, returned %d, error code: %d", ret, err);
wolfssl_print_error_msg(err);
return ESP_ERR_WOLFSSL_SSL_CONF_ALPN_PROTOCOLS_FAILED;
}
}
#else
ESP_LOGE(TAG, "CONFIG_WOLFSSL_HAVE_ALPN not enabled in menuconfig");
return ESP_FAIL;
#endif /* CONFIG_WOLFSSL_HAVE_ALPN */
}
wolfSSL_set_fd((WOLFSSL *)tls->priv_ssl, tls->sockfd);
return ESP_OK;
}
#ifdef CONFIG_ESP_TLS_SERVER
static esp_err_t set_server_config(esp_tls_cfg_server_t *cfg, esp_tls_t *tls)
{
int ret = WOLFSSL_FAILURE;
#ifdef WOLFSSL_TLS13
tls->priv_ctx = (void *)wolfSSL_CTX_new(wolfTLSv1_3_server_method());
#else
tls->priv_ctx = (void *)wolfSSL_CTX_new(wolfTLSv1_2_server_method());
#endif
if (!tls->priv_ctx) {
ESP_LOGE(TAG, "Set wolfSSL ctx failed");
return ESP_ERR_WOLFSSL_CTX_SETUP_FAILED;
}
if (cfg->cacert_buf != NULL) {
if ((esp_load_wolfssl_verify_buffer(tls,cfg->cacert_buf, cfg->cacert_bytes, FILE_TYPE_CA_CERT, &ret)) != ESP_OK) {
int err = wolfSSL_get_error( (WOLFSSL *)tls->priv_ssl, ret);
ESP_LOGE(TAG, "Error in loading certificate verify buffer, returned %d, error code: %d", ret, err);
wolfssl_print_error_msg(err);
return ESP_ERR_WOLFSSL_CERT_VERIFY_SETUP_FAILED;
}
wolfSSL_CTX_set_verify( (WOLFSSL_CTX *)tls->priv_ctx, WOLFSSL_VERIFY_PEER | WOLFSSL_VERIFY_FAIL_IF_NO_PEER_CERT, NULL);
ESP_LOGD(TAG," Verify Client for Mutual Auth");
} else {
ESP_LOGD(TAG," Not verifying Client ");
wolfSSL_CTX_set_verify( (WOLFSSL_CTX *)tls->priv_ctx, WOLFSSL_VERIFY_NONE, NULL);
}
if (cfg->servercert_buf != NULL && cfg->serverkey_buf != NULL) {
if ((esp_load_wolfssl_verify_buffer(tls,cfg->servercert_buf, cfg->servercert_bytes, FILE_TYPE_SELF_CERT, &ret)) != ESP_OK) {
int err = wolfSSL_get_error( (WOLFSSL *)tls->priv_ssl, ret);
ESP_LOGE(TAG, "Error in loading certificate verify buffer, returned %d, error code: %d", ret, err);
wolfssl_print_error_msg(err);
return ESP_ERR_WOLFSSL_CERT_VERIFY_SETUP_FAILED;
}
if ((esp_load_wolfssl_verify_buffer(tls,cfg->serverkey_buf, cfg->serverkey_bytes, FILE_TYPE_SELF_KEY, &ret)) != ESP_OK) {
int err = wolfSSL_get_error( (WOLFSSL *)tls->priv_ssl, ret);
ESP_LOGE(TAG, "Error in loading private key verify buffer, returned %d, error code: %d", ret, err);
wolfssl_print_error_msg(err);
return ESP_ERR_WOLFSSL_CERT_VERIFY_SETUP_FAILED;
}
} else {
ESP_LOGE(TAG, "You have to provide both servercert_buf and serverkey_buf for https_server");
return ESP_FAIL;
}
tls->priv_ssl =(void *)wolfSSL_new( (WOLFSSL_CTX *)tls->priv_ctx);
if (!tls->priv_ssl) {
ESP_LOGE(TAG, "Create wolfSSL failed");
return ESP_ERR_WOLFSSL_SSL_SETUP_FAILED;
}
wolfSSL_set_fd((WOLFSSL *)tls->priv_ssl, tls->sockfd);
return ESP_OK;
}
#endif
int esp_wolfssl_handshake(esp_tls_t *tls, const esp_tls_cfg_t *cfg)
{
int ret;
ret = wolfSSL_connect( (WOLFSSL *)tls->priv_ssl);
if (ret == WOLFSSL_SUCCESS) {
tls->conn_state = ESP_TLS_DONE;
return 1;
} else {
int err = wolfSSL_get_error( (WOLFSSL *)tls->priv_ssl, ret);
if (err != WOLFSSL_ERROR_WANT_READ && err != WOLFSSL_ERROR_WANT_WRITE) {
ESP_LOGE(TAG, "wolfSSL_connect returned %d, error code: %d", ret, err);
wolfssl_print_error_msg(err);
ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ESP_TLS_ERR_TYPE_WOLFSSL, err);
ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ESP_TLS_ERR_TYPE_ESP, ESP_ERR_WOLFSSL_SSL_HANDSHAKE_FAILED);
if (cfg->cacert_buf != NULL || cfg->use_global_ca_store == true) {
/* This is to check whether handshake failed due to invalid certificate*/
esp_wolfssl_verify_certificate(tls);
}
tls->conn_state = ESP_TLS_FAIL;
return -1;
}
/* Irrespective of blocking or non-blocking I/O, we return on getting wolfSSL_want_read
or wolfSSL_want_write during handshake */
return 0;
}
}
ssize_t esp_wolfssl_read(esp_tls_t *tls, char *data, size_t datalen)
{
ssize_t ret = wolfSSL_read( (WOLFSSL *)tls->priv_ssl, (unsigned char *)data, datalen);
if (ret < 0) {
int err = wolfSSL_get_error( (WOLFSSL *)tls->priv_ssl, ret);
/* peer sent close notify */
if (err == WOLFSSL_ERROR_ZERO_RETURN) {
return 0;
}
if (ret != WOLFSSL_ERROR_WANT_READ && ret != WOLFSSL_ERROR_WANT_WRITE) {
ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ESP_TLS_ERR_TYPE_WOLFSSL, -ret);
ESP_LOGE(TAG, "read error :%d:", ret);
wolfssl_print_error_msg(ret);
}
return esp_tls_convert_wolfssl_err_to_ssize(ret);
}
return ret;
}
ssize_t esp_wolfssl_write(esp_tls_t *tls, const char *data, size_t datalen)
{
ssize_t ret = wolfSSL_write( (WOLFSSL *)tls->priv_ssl, (unsigned char *) data, datalen);
if (ret <= 0) {
int err = wolfSSL_get_error( (WOLFSSL *)tls->priv_ssl, ret);
if (err != WOLFSSL_ERROR_WANT_READ && err != WOLFSSL_ERROR_WANT_WRITE) {
ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ESP_TLS_ERR_TYPE_WOLFSSL, -err);
ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ESP_TLS_ERR_TYPE_ESP, ESP_ERR_WOLFSSL_SSL_WRITE_FAILED);
ESP_LOGE(TAG, "write error :%d:", err);
wolfssl_print_error_msg(err);
}
return esp_tls_convert_wolfssl_err_to_ssize(ret);
}
return ret;
}
void esp_wolfssl_verify_certificate(esp_tls_t *tls)
{
int flags;
if ((flags = wolfSSL_get_verify_result( (WOLFSSL *)tls->priv_ssl)) != X509_V_OK) {
ESP_LOGE(TAG, "Failed to verify peer certificate , returned %d", flags);
ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ESP_TLS_ERR_TYPE_WOLFSSL_CERT_FLAGS, flags);
} else {
ESP_LOGI(TAG, "Certificate verified.");
}
}
ssize_t esp_wolfssl_get_bytes_avail(esp_tls_t *tls)
{
if (!tls) {
ESP_LOGE(TAG, "empty arg passed to esp_tls_get_bytes_avail()");
return ESP_FAIL;
}
return wolfSSL_pending( (WOLFSSL *)tls->priv_ssl);
}
void esp_wolfssl_conn_delete(esp_tls_t *tls)
{
if (tls != NULL) {
esp_wolfssl_cleanup(tls);
}
}
void esp_wolfssl_cleanup(esp_tls_t *tls)
{
if (!tls) {
return;
}
#ifdef CONFIG_ESP_TLS_PSK_VERIFICATION
xSemaphoreGive(tls_conn_lock);
#endif /* CONFIG_ESP_TLS_PSK_VERIFICATION */
wolfSSL_shutdown( (WOLFSSL *)tls->priv_ssl);
wolfSSL_free( (WOLFSSL *)tls->priv_ssl);
tls->priv_ssl = NULL;
wolfSSL_CTX_free( (WOLFSSL_CTX *)tls->priv_ctx);
tls->priv_ctx = NULL;
wolfSSL_Cleanup();
}
#ifdef CONFIG_ESP_TLS_SERVER
/**
* @brief Create TLS/SSL server session
*/
int esp_wolfssl_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 = esp_create_wolfssl_handle(NULL, 0, cfg, tls);
if (esp_ret != ESP_OK) {
ESP_LOGE(TAG, "create_ssl_handle failed, [0x%04X] (%s)", esp_ret, esp_err_to_name(esp_ret));
ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ESP_TLS_ERR_TYPE_ESP, esp_ret);
tls->conn_state = ESP_TLS_FAIL;
return -1;
}
tls->read = esp_wolfssl_read;
tls->write = esp_wolfssl_write;
int ret;
while ((ret = wolfSSL_accept((WOLFSSL *)tls->priv_ssl)) != WOLFSSL_SUCCESS) {
int err = wolfSSL_get_error((WOLFSSL *)tls->priv_ssl, ret);
if (err != WOLFSSL_ERROR_WANT_READ && ret != WOLFSSL_ERROR_WANT_WRITE) {
ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ESP_TLS_ERR_TYPE_WOLFSSL, err);
ESP_LOGE(TAG, "wolfSSL_accept returned %d, error code: %d", ret, err);
wolfssl_print_error_msg(err);
tls->conn_state = ESP_TLS_FAIL;
return -1;
}
}
return 0;
}
/**
* @brief Close the server side TLS/SSL connection and free any allocated resources.
*/
void esp_wolfssl_server_session_delete(esp_tls_t *tls)
{
if (tls != NULL) {
esp_wolfssl_cleanup(tls);
esp_tls_internal_event_tracker_destroy(tls->error_handle);
free(tls);
}
}
#endif /* CONFIG_ESP_TLS_SERVER */
esp_err_t esp_wolfssl_init_global_ca_store(void)
{
/* This function is just to provide consistancy between function calls of esp_tls.h and wolfssl */
return ESP_OK;
}
esp_err_t esp_wolfssl_set_global_ca_store(const unsigned char *cacert_pem_buf, const unsigned int cacert_pem_bytes)
{
if (cacert_pem_buf == NULL) {
ESP_LOGE(TAG, "cacert_pem_buf is null");
return ESP_ERR_INVALID_ARG;
}
if (global_cacert != NULL) {
esp_wolfssl_free_global_ca_store();
}
global_cacert = (unsigned char *)strndup((const char *)cacert_pem_buf, cacert_pem_bytes);
if (!global_cacert) {
return ESP_FAIL;
}
global_cacert_pem_bytes = cacert_pem_bytes;
return ESP_OK;
}
void esp_wolfssl_free_global_ca_store(void)
{
if (global_cacert) {
free(global_cacert);
global_cacert = NULL;
global_cacert_pem_bytes = 0;
}
}
#if defined(CONFIG_ESP_TLS_PSK_VERIFICATION)
static esp_err_t esp_wolfssl_set_cipher_list(WOLFSSL_CTX *ctx)
{
const char *defaultCipherList;
int ret;
#if defined(HAVE_AESGCM) && !defined(NO_DH)
#ifdef WOLFSSL_TLS13
defaultCipherList = "DHE-PSK-AES128-GCM-SHA256:"
"TLS13-AES128-GCM-SHA256";
#else
defaultCipherList = "DHE-PSK-AES128-GCM-SHA256";
#endif
#elif defined(HAVE_NULL_CIPHER)
defaultCipherList = "PSK-NULL-SHA256";
#else
defaultCipherList = "PSK-AES128-CBC-SHA256";
#endif
ESP_LOGD(TAG, "cipher list is %s", defaultCipherList);
if ((ret = wolfSSL_CTX_set_cipher_list(ctx,defaultCipherList)) != WOLFSSL_SUCCESS) {
wolfSSL_CTX_free(ctx);
int err = wolfSSL_get_error( (WOLFSSL *)tls->priv_ssl, ret);
ESP_LOGE(TAG, "can't set cipher list, returned %d, error code: %d", ret, err);
wolfssl_print_error_msg(err);
return ESP_FAIL;
}
return ESP_OK;
}
/* initialize the mutex before app_main() when using PSK */
static void __attribute__((constructor))
espt_tls_wolfssl_init_conn_lock (void)
{
if ((tls_conn_lock = xSemaphoreCreateMutex()) == NULL) {
ESP_EARLY_LOGE(TAG, "mutex for tls psk connection could not be created");
}
}
/* Some callback functions required by PSK */
static inline unsigned int esp_wolfssl_psk_client_cb(WOLFSSL* ssl, const char* hint,
char* identity, unsigned int id_max_len, unsigned char* key,
unsigned int key_max_len)
{
(void)key_max_len;
/* see internal.h MAX_PSK_ID_LEN for PSK identity limit */
memcpy(identity, psk_id_str, id_max_len);
for(int count = 0; count < psk_key_max_len; count ++) {
key[count] = psk_key_array[count];
}
xSemaphoreGive(tls_conn_lock);
return psk_key_max_len;
/* return length of key in octets or 0 or for error */
}
#endif /* CONFIG_ESP_TLS_PSK_VERIFICATION */
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