553 lines
21 KiB
C
553 lines
21 KiB
C
// Copyright 2019 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_wolfssl.h"
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#include "esp_tls_error_capture_internal.h"
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#include <errno.h>
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#include "esp_log.h"
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static unsigned char *global_cacert = NULL;
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static unsigned int global_cacert_pem_bytes = 0;
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static const char *TAG = "esp-tls-wolfssl";
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/* Prototypes for the static functions */
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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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#if defined(CONFIG_ESP_TLS_PSK_VERIFICATION)
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#include "freertos/semphr.h"
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static SemaphoreHandle_t tls_conn_lock;
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static inline unsigned int esp_wolfssl_psk_client_cb(WOLFSSL* ssl, const char* hint, char* identity,
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unsigned int id_max_len, unsigned char* key,unsigned int key_max_len);
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static esp_err_t esp_wolfssl_set_cipher_list(WOLFSSL_CTX *ctx);
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#ifdef WOLFSSL_TLS13
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#define PSK_MAX_ID_LEN 128
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#else
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#define PSK_MAX_ID_LEN 64
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#endif
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#define PSK_MAX_KEY_LEN 64
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static char psk_id_str[PSK_MAX_ID_LEN];
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static uint8_t psk_key_array[PSK_MAX_KEY_LEN];
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static uint8_t psk_key_max_len = 0;
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#endif /* CONFIG_ESP_TLS_PSK_VERIFICATION */
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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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#endif /* CONFIG_ESP_TLS_SERVER */
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typedef enum x509_file_type {
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FILE_TYPE_CA_CERT = 0, /* CA certificate to authenticate entity at other end */
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FILE_TYPE_SELF_CERT, /* Self certificate of the entity */
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FILE_TYPE_SELF_KEY, /* Private key in the self cert-key pair */
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} x509_file_type_t;
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/* Checks whether the certificate provided is in pem format or not */
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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)
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{
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int wolf_fileformat = WOLFSSL_FILETYPE_DEFAULT;
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if (type == FILE_TYPE_SELF_KEY) {
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if (cert_buf[cert_len - 1] == '\0' && strstr( (const char *) cert_buf, "-----BEGIN " )) {
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wolf_fileformat = WOLFSSL_FILETYPE_PEM;
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} else {
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wolf_fileformat = WOLFSSL_FILETYPE_ASN1;
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}
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if ((*err_ret = wolfSSL_CTX_use_PrivateKey_buffer( (WOLFSSL_CTX *)tls->priv_ctx, cert_buf, cert_len, wolf_fileformat)) == WOLFSSL_SUCCESS) {
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return ESP_OK;
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}
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return ESP_FAIL;
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} else {
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if (cert_buf[cert_len - 1] == '\0' && strstr( (const char *) cert_buf, "-----BEGIN CERTIFICATE-----" )) {
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wolf_fileformat = WOLFSSL_FILETYPE_PEM;
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} else {
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wolf_fileformat = WOLFSSL_FILETYPE_ASN1;
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}
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if (type == FILE_TYPE_SELF_CERT) {
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if ((*err_ret = wolfSSL_CTX_use_certificate_buffer( (WOLFSSL_CTX *)tls->priv_ctx, cert_buf, cert_len, wolf_fileformat)) == WOLFSSL_SUCCESS) {
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return ESP_OK;
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}
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return ESP_FAIL;
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} else if (type == FILE_TYPE_CA_CERT) {
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if ((*err_ret = wolfSSL_CTX_load_verify_buffer( (WOLFSSL_CTX *)tls->priv_ctx, cert_buf, cert_len, wolf_fileformat)) == WOLFSSL_SUCCESS) {
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return ESP_OK;
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}
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return ESP_FAIL;
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} else {
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/* Wrong file type provided */
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return ESP_FAIL;
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}
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}
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}
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esp_err_t esp_create_wolfssl_handle(const char *hostname, size_t hostlen, const void *cfg, esp_tls_t *tls)
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{
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#ifdef CONFIG_ESP_DEBUG_WOLFSSL
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wolfSSL_Debugging_ON();
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#endif
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assert(cfg != NULL);
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assert(tls != NULL);
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esp_err_t esp_ret = ESP_FAIL;
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int ret;
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ret = wolfSSL_Init();
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if (ret != WOLFSSL_SUCCESS) {
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ESP_LOGE(TAG, "Init wolfSSL failed: %d", ret);
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ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ERR_TYPE_WOLFSSL, -ret);
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goto exit;
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}
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if (tls->role == ESP_TLS_CLIENT) {
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esp_ret = set_client_config(hostname, hostlen, (esp_tls_cfg_t *)cfg, tls);
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if (esp_ret != ESP_OK) {
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ESP_LOGE(TAG, "Failed to set client configurations");
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goto exit;
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}
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} else if (tls->role == ESP_TLS_SERVER) {
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#ifdef CONFIG_ESP_TLS_SERVER
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esp_ret = set_server_config((esp_tls_cfg_server_t *) cfg, tls);
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if (esp_ret != ESP_OK) {
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ESP_LOGE(TAG, "Failed to set server configurations");
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goto exit;
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}
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#else
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ESP_LOGE(TAG, "ESP_TLS_SERVER Not enabled in menuconfig");
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goto exit;
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#endif
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}
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else {
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ESP_LOGE(TAG, "tls->role is not valid");
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goto exit;
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}
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return ESP_OK;
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exit:
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esp_wolfssl_cleanup(tls);
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return esp_ret;
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}
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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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int ret = WOLFSSL_FAILURE;
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tls->priv_ctx = (void *)wolfSSL_CTX_new(wolfTLSv1_2_client_method());
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if (!tls->priv_ctx) {
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ESP_LOGE(TAG, "Set wolfSSL ctx failed");
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ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ERR_TYPE_WOLFSSL, -ret);
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return ESP_ERR_WOLFSSL_CTX_SETUP_FAILED;
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}
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if (cfg->use_global_ca_store == true) {
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if ((esp_load_wolfssl_verify_buffer(tls, global_cacert, global_cacert_pem_bytes, FILE_TYPE_CA_CERT, &ret)) != ESP_OK) {
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ESP_LOGE(TAG, "Error in loading certificate verify buffer, returned %d", ret);
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return ESP_ERR_WOLFSSL_CERT_VERIFY_SETUP_FAILED;
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}
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wolfSSL_CTX_set_verify( (WOLFSSL_CTX *)tls->priv_ctx, WOLFSSL_VERIFY_PEER, NULL);
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} else if (cfg->cacert_buf != NULL) {
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if ((esp_load_wolfssl_verify_buffer(tls, cfg->cacert_buf, cfg->cacert_bytes, FILE_TYPE_CA_CERT, &ret)) != ESP_OK) {
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ESP_LOGE(TAG, "Error in loading certificate verify buffer, returned %d", ret);
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return ESP_ERR_WOLFSSL_CERT_VERIFY_SETUP_FAILED;
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}
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wolfSSL_CTX_set_verify( (WOLFSSL_CTX *)tls->priv_ctx, WOLFSSL_VERIFY_PEER, NULL);
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} else if (cfg->psk_hint_key) {
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#if defined(CONFIG_ESP_TLS_PSK_VERIFICATION)
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/*** PSK encryption mode is configured only if no certificate supplied and psk pointer not null ***/
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if(cfg->psk_hint_key->key == NULL || cfg->psk_hint_key->hint == NULL || cfg->psk_hint_key->key_size <= 0) {
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ESP_LOGE(TAG, "Please provide appropriate key, keysize and hint to use PSK");
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return ESP_FAIL;
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}
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/* mutex is given back when call back function executes or in case of failure (at cleanup) */
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if ((xSemaphoreTake(tls_conn_lock, 1000/portTICK_PERIOD_MS) != pdTRUE)) {
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ESP_LOGE(TAG, "tls_conn_lock could not be obtained in specified time");
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return -1;
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}
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ESP_LOGI(TAG, "setting psk configurations");
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if((cfg->psk_hint_key->key_size > PSK_MAX_KEY_LEN) || (strlen(cfg->psk_hint_key->hint) > PSK_MAX_ID_LEN)) {
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ESP_LOGE(TAG, "psk key length should be <= %d and identity hint length should be <= %d", PSK_MAX_KEY_LEN, PSK_MAX_ID_LEN);
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return ESP_ERR_INVALID_ARG;
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}
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psk_key_max_len = cfg->psk_hint_key->key_size;
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memset(psk_key_array, 0, sizeof(psk_key_array));
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memset(psk_id_str, 0, sizeof(psk_id_str));
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memcpy(psk_key_array, cfg->psk_hint_key->key, psk_key_max_len);
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memcpy(psk_id_str, cfg->psk_hint_key->hint, strlen(cfg->psk_hint_key->hint));
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wolfSSL_CTX_set_psk_client_callback( (WOLFSSL_CTX *)tls->priv_ctx, esp_wolfssl_psk_client_cb);
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if(esp_wolfssl_set_cipher_list( (WOLFSSL_CTX *)tls->priv_ctx) != ESP_OK) {
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ESP_LOGE(TAG, "error in setting cipher-list");
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return ESP_FAIL;
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}
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#else
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ESP_LOGE(TAG, "psk_hint_key configured but not enabled in menuconfig: Please enable ESP_TLS_PSK_VERIFICATION option");
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return ESP_ERR_INVALID_STATE;
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#endif
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} else {
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wolfSSL_CTX_set_verify( (WOLFSSL_CTX *)tls->priv_ctx, WOLFSSL_VERIFY_NONE, NULL);
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}
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if (cfg->clientcert_buf != NULL && cfg->clientkey_buf != NULL) {
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if ((esp_load_wolfssl_verify_buffer(tls,cfg->clientcert_buf, cfg->clientcert_bytes, FILE_TYPE_SELF_CERT, &ret)) != ESP_OK) {
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ESP_LOGE(TAG, "Error in loading certificate verify buffer, returned %d", ret);
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return ESP_ERR_WOLFSSL_CERT_VERIFY_SETUP_FAILED;
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}
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if ((esp_load_wolfssl_verify_buffer(tls,cfg->clientkey_buf, cfg->clientkey_bytes, FILE_TYPE_SELF_KEY, &ret)) != ESP_OK) {
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ESP_LOGE(TAG, "Error in loading private key verify buffer, returned %d", ret);
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return ESP_ERR_WOLFSSL_CERT_VERIFY_SETUP_FAILED;
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}
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} else if (cfg->clientcert_buf != NULL || cfg->clientkey_buf != NULL) {
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ESP_LOGE(TAG, "You have to provide both clientcert_buf and clientkey_buf for mutual authentication\n\n");
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return ESP_FAIL;
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}
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if (cfg->crt_bundle_attach != NULL) {
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ESP_LOGE(TAG,"use_crt_bundle not supported in wolfssl");
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return ESP_FAIL;
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}
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tls->priv_ssl =(void *)wolfSSL_new( (WOLFSSL_CTX *)tls->priv_ctx);
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if (!tls->priv_ssl) {
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ESP_LOGE(TAG, "Create wolfSSL failed");
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ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ERR_TYPE_WOLFSSL, -ret);
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return ESP_ERR_WOLFSSL_SSL_SETUP_FAILED;
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}
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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 = strdup(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 = wolfSSL_set_tlsext_host_name( (WOLFSSL *)tls->priv_ssl, use_host))!= WOLFSSL_SUCCESS) {
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ESP_LOGE(TAG, "wolfSSL_set_tlsext_host_name returned -0x%x", -ret);
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ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ERR_TYPE_WOLFSSL, -ret);
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free(use_host);
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return ESP_ERR_WOLFSSL_SSL_SET_HOSTNAME_FAILED;
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}
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free(use_host);
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}
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if (cfg->alpn_protos) {
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#ifdef CONFIG_WOLFSSL_HAVE_ALPN
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char **alpn_list = (char **)cfg->alpn_protos;
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for (; *alpn_list != NULL; alpn_list ++) {
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ESP_LOGD(TAG, "alpn protocol is %s", *alpn_list);
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if ((ret = wolfSSL_UseALPN( (WOLFSSL *)tls->priv_ssl, *alpn_list, strlen(*alpn_list), WOLFSSL_ALPN_FAILED_ON_MISMATCH)) != WOLFSSL_SUCCESS) {
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ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ERR_TYPE_WOLFSSL, -ret);
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ESP_LOGE(TAG, "wolfSSL UseALPN failed, returned %d", ret);
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return ESP_ERR_WOLFSSL_SSL_CONF_ALPN_PROTOCOLS_FAILED;
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}
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}
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#else
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ESP_LOGE(TAG, "CONFIG_WOLFSSL_HAVE_ALPN not enabled in menuconfig");
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return ESP_FAIL;
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#endif /* CONFIG_WOLFSSL_HAVE_ALPN */
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}
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wolfSSL_set_fd((WOLFSSL *)tls->priv_ssl, tls->sockfd);
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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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int ret = WOLFSSL_FAILURE;
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tls->priv_ctx = (void *)wolfSSL_CTX_new(wolfTLSv1_2_server_method());
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if (!tls->priv_ctx) {
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ESP_LOGE(TAG, "Set wolfSSL ctx failed");
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return ESP_ERR_WOLFSSL_CTX_SETUP_FAILED;
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}
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if (cfg->cacert_buf != NULL) {
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if ((esp_load_wolfssl_verify_buffer(tls,cfg->cacert_buf, cfg->cacert_bytes, FILE_TYPE_CA_CERT, &ret)) != ESP_OK) {
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ESP_LOGE(TAG, "Error in loading certificate verify buffer, returned %d", ret);
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return ESP_ERR_WOLFSSL_CERT_VERIFY_SETUP_FAILED;
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}
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wolfSSL_CTX_set_verify( (WOLFSSL_CTX *)tls->priv_ctx, WOLFSSL_VERIFY_PEER | WOLFSSL_VERIFY_FAIL_IF_NO_PEER_CERT, NULL);
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ESP_LOGD(TAG," Verify Client for Mutual Auth");
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} else {
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ESP_LOGD(TAG," Not verifying Client ");
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wolfSSL_CTX_set_verify( (WOLFSSL_CTX *)tls->priv_ctx, WOLFSSL_VERIFY_NONE, NULL);
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}
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if (cfg->servercert_buf != NULL && cfg->serverkey_buf != NULL) {
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if ((esp_load_wolfssl_verify_buffer(tls,cfg->servercert_buf, cfg->servercert_bytes, FILE_TYPE_SELF_CERT, &ret)) != ESP_OK) {
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ESP_LOGE(TAG, "Error in loading certificate verify buffer, returned %d", ret);
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return ESP_ERR_WOLFSSL_CERT_VERIFY_SETUP_FAILED;
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}
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if ((esp_load_wolfssl_verify_buffer(tls,cfg->serverkey_buf, cfg->serverkey_bytes, FILE_TYPE_SELF_KEY, &ret)) != ESP_OK) {
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ESP_LOGE(TAG, "Error in loading private key verify buffer, returned %d", ret);
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return ESP_ERR_WOLFSSL_CERT_VERIFY_SETUP_FAILED;
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}
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} else {
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ESP_LOGE(TAG, "You have to provide both servercert_buf and serverkey_buf for https_server\n\n");
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return ESP_FAIL;
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}
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tls->priv_ssl =(void *)wolfSSL_new( (WOLFSSL_CTX *)tls->priv_ctx);
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if (!tls->priv_ssl) {
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ESP_LOGE(TAG, "Create wolfSSL failed");
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return ESP_ERR_WOLFSSL_SSL_SETUP_FAILED;
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}
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wolfSSL_set_fd((WOLFSSL *)tls->priv_ssl, tls->sockfd);
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return ESP_OK;
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}
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#endif
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int esp_wolfssl_handshake(esp_tls_t *tls, const esp_tls_cfg_t *cfg)
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{
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int ret;
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ret = wolfSSL_connect( (WOLFSSL *)tls->priv_ssl);
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if (ret == WOLFSSL_SUCCESS) {
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tls->conn_state = ESP_TLS_DONE;
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return 1;
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} else {
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int err = wolfSSL_get_error( (WOLFSSL *)tls->priv_ssl, ret);
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if (err != ESP_TLS_ERR_SSL_WANT_READ && err != ESP_TLS_ERR_SSL_WANT_WRITE) {
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ESP_LOGE(TAG, "wolfSSL_connect returned -0x%x", -ret);
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ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ERR_TYPE_WOLFSSL, -ret);
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ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ERR_TYPE_ESP, ESP_ERR_WOLFSSL_SSL_HANDSHAKE_FAILED);
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if (cfg->cacert_buf != NULL || cfg->use_global_ca_store == true) {
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/* This is to check whether handshake failed due to invalid certificate*/
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esp_wolfssl_verify_certificate(tls);
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}
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tls->conn_state = ESP_TLS_FAIL;
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return -1;
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}
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/* Irrespective of blocking or non-blocking I/O, we return on getting wolfSSL_want_read
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or wolfSSL_want_write during handshake */
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return 0;
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}
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}
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ssize_t esp_wolfssl_read(esp_tls_t *tls, char *data, size_t datalen)
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{
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ssize_t ret = wolfSSL_read( (WOLFSSL *)tls->priv_ssl, (unsigned char *)data, datalen);
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if (ret < 0) {
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ret = wolfSSL_get_error( (WOLFSSL *)tls->priv_ssl, ret);
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/* peer sent close notify */
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if (ret == WOLFSSL_ERROR_ZERO_RETURN) {
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return 0;
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}
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if (ret != ESP_TLS_ERR_SSL_WANT_READ && ret != ESP_TLS_ERR_SSL_WANT_WRITE) {
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ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ERR_TYPE_WOLFSSL, -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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ssize_t esp_wolfssl_write(esp_tls_t *tls, const char *data, size_t datalen)
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{
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ssize_t ret = wolfSSL_write( (WOLFSSL *)tls->priv_ssl, (unsigned char *) data, datalen);
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if (ret < 0) {
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ret = wolfSSL_get_error( (WOLFSSL *)tls->priv_ssl, ret);
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if (ret != ESP_TLS_ERR_SSL_WANT_READ && ret != ESP_TLS_ERR_SSL_WANT_WRITE) {
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ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ERR_TYPE_WOLFSSL, -ret);
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ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ERR_TYPE_ESP, ESP_ERR_WOLFSSL_SSL_WRITE_FAILED);
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ESP_LOGE(TAG, "write 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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void esp_wolfssl_verify_certificate(esp_tls_t *tls)
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{
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int flags;
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if ((flags = wolfSSL_get_verify_result( (WOLFSSL *)tls->priv_ssl)) != X509_V_OK) {
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ESP_LOGE(TAG, "Failed to verify peer certificate , returned %d!", flags);
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ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, 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");
|
|
ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, 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) {
|
|
if (ret != ESP_TLS_ERR_SSL_WANT_READ && ret != ESP_TLS_ERR_SSL_WANT_WRITE) {
|
|
ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ERR_TYPE_WOLFSSL, -ret);
|
|
ESP_LOGE(TAG, "wolfSSL_handshake_server 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_wolfssl_server_session_delete(esp_tls_t *tls)
|
|
{
|
|
if (tls != NULL) {
|
|
esp_wolfssl_cleanup(tls);
|
|
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);
|
|
ESP_LOGE(TAG, "can't set cipher list, returned %02x", ret);
|
|
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 */
|