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6c83e63371
esp-idf/components/esp-tls/esp_tls_wolfssl.c
Mahavir Jain ea3bb21cf7
fix(esp-tls): fix the certificate check failure logging for cert bundle case 
For ESP certificate bundle case, the certificate failure error from
underlying TLS stack was not being tracked. Added the fix and also
updated example code showcasing how to retrieve it.

Closes https://github.com/espressif/esp-idf/issues/12034
2023-08-11 17:27:01 +05:30

625 lines
24 KiB
C
Raw Blame History

/*
* 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");
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->crt_bundle_attach != NULL || 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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