419 lines
14 KiB
C
419 lines
14 KiB
C
/* server-tls.c
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*
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* Copyright (C) 2006-2023 wolfSSL Inc.
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*
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* This file is part of wolfSSL.
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*
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* wolfSSL is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* wolfSSL is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
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*/
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#include "server-tls.h"
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/* Espressif FreeRTOS */
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#ifndef SINGLE_THREADED
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#include <freertos/FreeRTOS.h>
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#include <freertos/task.h>
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#include <freertos/event_groups.h>
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#endif
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/* socket includes */
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#include <lwip/netdb.h>
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#include <lwip/sockets.h>
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/* wolfSSL */
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#include <wolfssl/wolfcrypt/settings.h>
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#include "user_settings.h"
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#include <wolfssl/ssl.h>
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#ifdef WOLFSSL_TRACK_MEMORY
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#include <wolfssl/wolfcrypt/mem_track.h>
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#endif
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#ifndef NO_DH
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/* see also wolfssl/test.h */
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#undef DEFAULT_MIN_DHKEY_BITS
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#define DEFAULT_MIN_DHKEY_BITS 1024
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#undef DEFAULT_MAX_DHKEY_BITS
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#define DEFAULT_MAX_DHKEY_BITS 2048
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#endif
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#if defined(WOLFSSL_SM2) || defined(WOLFSSL_SM3) || defined(WOLFSSL_SM4)
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#include <wolfssl/certs_test_sm.h>
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#define CTX_CA_CERT root_sm2
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#define CTX_CA_CERT_SIZE sizeof_root_sm2
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#define CTX_CA_CERT_TYPE WOLFSSL_FILETYPE_PEM
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#define CTX_SERVER_CERT server_sm2
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#define CTX_SERVER_CERT_SIZE sizeof_server_sm2
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#define CTX_SERVER_CERT_TYPE WOLFSSL_FILETYPE_PEM
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#define CTX_SERVER_KEY server_sm2_priv
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#define CTX_SERVER_KEY_SIZE sizeof_server_sm2_priv
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#define CTX_SERVER_KEY_TYPE WOLFSSL_FILETYPE_PEM
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#else
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#include <wolfssl/certs_test.h>
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#define CTX_CA_CERT ca_cert_der_2048
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#define CTX_CA_CERT_SIZE sizeof_ca_cert_der_2048
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#define CTX_CA_CERT_TYPE WOLFSSL_FILETYPE_ASN1
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#define CTX_SERVER_CERT server_cert_der_2048
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#define CTX_SERVER_CERT_SIZE sizeof_server_cert_der_2048
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#define CTX_SERVER_CERT_TYPE WOLFSSL_FILETYPE_ASN1
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#define CTX_SERVER_KEY server_key_der_2048
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#define CTX_SERVER_KEY_SIZE sizeof_server_key_der_2048
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#define CTX_SERVER_KEY_TYPE WOLFSSL_FILETYPE_ASN1
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#endif
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/* Project */
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#include "wifi_connect.h"
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#include "time_helper.h"
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static const char* const TAG = "server-tls";
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int stack_start = -1;
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int ShowCiphers(WOLFSSL* ssl)
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{
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#define CLIENT_TLS_MAX_CIPHER_LENGTH 4096
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char ciphers[CLIENT_TLS_MAX_CIPHER_LENGTH];
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const char* cipher_used;
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int ret = 0;
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if (ssl == NULL) {
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ESP_LOGI(TAG, "WOLFSSL* ssl is NULL, so no cipher in use");
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ret = wolfSSL_get_ciphers(ciphers, (int)sizeof(ciphers));
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if (ret == WOLFSSL_SUCCESS) {
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for (int i = 0; i < CLIENT_TLS_MAX_CIPHER_LENGTH; i++) {
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if (ciphers[i] == ':') {
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ciphers[i] = '\n';
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}
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}
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ESP_LOGI(TAG, "Available Ciphers:\n%s\n", ciphers);
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}
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else {
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ESP_LOGE(TAG, "Failed to call wolfSSL_get_ciphers. Error: %d", ret);
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}
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}
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else {
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cipher_used = wolfSSL_get_cipher_name(ssl);
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ESP_LOGI(TAG, "WOLFSSL* ssl using %s", cipher_used);
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}
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return ret;
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}
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/* FreeRTOS */
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/* server task */
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WOLFSSL_ESP_TASK tls_smp_server_task(void *args)
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{
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#if defined(SINGLE_THREADED)
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#define TLS_SMP_SERVER_TASK_RET ret
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#else
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#define TLS_SMP_SERVER_TASK_RET
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#endif
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char buff[256];
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const char msg[] = "I hear you fa shizzle!";
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struct sockaddr_in servAddr;
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struct sockaddr_in clientAddr;
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int sockfd;
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int connd;
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int shutdown = 0;
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int ret;
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socklen_t size = sizeof(clientAddr);
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size_t len;
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/* declare wolfSSL objects */
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WOLFSSL_CTX* ctx;
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WOLFSSL* ssl;
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WOLFSSL_ENTER("tls_smp_server_task");
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#ifdef DEBUG_WOLFSSL
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wolfSSL_Debugging_ON();
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ShowCiphers(NULL);
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#endif
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/* Initialize wolfSSL */
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WOLFSSL_MSG("Start wolfSSL_Init()");
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wolfSSL_Init();
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/* Create a socket that uses an internet IPv4 address,
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* Sets the socket to be stream based (TCP),
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* 0 means choose the default protocol. */
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WOLFSSL_MSG( "start socket())");
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if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
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ESP_LOGE(TAG, "ERROR: failed to create the socket");
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}
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/* Create and initialize WOLFSSL_CTX */
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WOLFSSL_MSG("Create and initialize WOLFSSL_CTX");
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#if defined(WOLFSSL_SM2) || defined(WOLFSSL_SM3) || defined(WOLFSSL_SM4)
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ctx = wolfSSL_CTX_new(wolfSSLv23_server_method());
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// ctx = wolfSSL_CTX_new(wolfTLSv1_3_client_method()); /* only TLS 1.3 */
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if (ctx == NULL) {
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ESP_LOGE(TAG, "ERROR: failed to create WOLFSSL_CTX");
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}
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#else
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/* TODO remove duplicate */
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if ((ctx = wolfSSL_CTX_new(wolfSSLv23_server_method())) == NULL) {
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ESP_LOGE(TAG, "ERROR: failed to create WOLFSSL_CTX");
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}
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#endif
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#if defined(WOLFSSL_SM2) || defined(WOLFSSL_SM3) || defined(WOLFSSL_SM4)
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ESP_LOGI(TAG, "Start SM3\n");
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/* Optional set explicit ciphers
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ret = wolfSSL_CTX_set_cipher_list(ctx, WOLFSSL_ESP32_CIPHER_SUITE);
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if (ret == SSL_SUCCESS) {
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ESP_LOGI(TAG, "Set cipher list: "WOLFSSL_ESP32_CIPHER_SUITE"\n");
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}
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else {
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ESP_LOGE(TAG, "ERROR: failed to set cipher list: "WOLFSSL_ESP32_CIPHER_SUITE"\n");
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}
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*/
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ShowCiphers(NULL);
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ESP_LOGI(TAG, "Stack used: %d\n", CONFIG_ESP_MAIN_TASK_STACK_SIZE
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- uxTaskGetStackHighWaterMark(NULL));
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WOLFSSL_MSG("Loading certificate...");
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/* -c Load server certificates into WOLFSSL_CTX */
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ret = wolfSSL_CTX_use_certificate_chain_buffer_format(ctx,
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CTX_SERVER_CERT,
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CTX_SERVER_CERT_SIZE,
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CTX_SERVER_CERT_TYPE
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);
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/* optional wolfSSL_CTX_use_certificate_buffer
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ret = wolfSSL_CTX_use_certificate_buffer(ctx,
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server_sm2,
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sizeof_server_sm2,
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WOLFSSL_FILETYPE_PEM);
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*/
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if (ret == SSL_SUCCESS) {
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ESP_LOGI(TAG, "Loaded server_sm2\n");
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}
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else {
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ESP_LOGE(TAG, "ERROR: failed to load cert\n");
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}
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ESP_LOGI(TAG, "Stack used: %d\n", CONFIG_ESP_MAIN_TASK_STACK_SIZE
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- uxTaskGetStackHighWaterMark(NULL));
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#ifndef NO_DH
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#define DEFAULT_MIN_DHKEY_BITS 1024
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#define DEFAULT_MAX_DHKEY_BITS 2048
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int minDhKeyBits = DEFAULT_MIN_DHKEY_BITS;
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ret = wolfSSL_CTX_SetMinDhKey_Sz(ctx, (word16)minDhKeyBits);
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#endif
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#ifndef NO_RSA
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#define DEFAULT_MIN_RSAKEY_BITS 1024
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short minRsaKeyBits = DEFAULT_MIN_RSAKEY_BITS;
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ret = wolfSSL_CTX_SetMinRsaKey_Sz(ctx, minRsaKeyBits);
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#endif
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WOLFSSL_MSG("Loading key info...");
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/* -k Load server key into WOLFSSL_CTX */
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ret = wolfSSL_CTX_use_PrivateKey_buffer(ctx,
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CTX_SERVER_KEY,
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CTX_SERVER_KEY_SIZE,
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CTX_SERVER_KEY_TYPE);
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if (ret == SSL_SUCCESS) {
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ESP_LOGI(TAG, "Loaded PrivateKey_buffer server_sm2_priv\n");
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}
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else {
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ESP_LOGE(TAG, "ERROR: failed to load "
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"PrivateKey_buffer server_sm2_priv\n");
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}
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ESP_LOGI(TAG, "Stack used: %d\n", CONFIG_ESP_MAIN_TASK_STACK_SIZE
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- uxTaskGetStackHighWaterMark(NULL));
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/* -A load authority */
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ret = wolfSSL_CTX_load_verify_buffer(ctx,
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client_sm2,
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sizeof_client_sm2,
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WOLFSSL_FILETYPE_PEM);
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if (ret == SSL_SUCCESS) {
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ESP_LOGI(TAG, "Success: load verify buffer\n");
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}
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else {
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ESP_LOGE(TAG, "ERROR: failed to load verify buffer\n");
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}
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ESP_LOGI(TAG, "Finish SM2\n");
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#else
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WOLFSSL_MSG("Loading certificate...");
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/* Load server certificates into WOLFSSL_CTX */
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if ((ret = wolfSSL_CTX_use_certificate_buffer(ctx, server_cert_der_2048,
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sizeof_server_cert_der_2048,
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WOLFSSL_FILETYPE_ASN1)) != SSL_SUCCESS) {
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ESP_LOGE(TAG, "ERROR: failed to load cert");
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}
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WOLFSSL_MSG("Loading key info...");
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/* Load server key into WOLFSSL_CTX */
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if((ret=wolfSSL_CTX_use_PrivateKey_buffer(ctx,
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server_key_der_2048, sizeof_server_key_der_2048,
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WOLFSSL_FILETYPE_ASN1)) != SSL_SUCCESS) {
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ESP_LOGE(TAG, "ERROR: failed to load privatekey");
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}
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#endif
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/* TODO when using ECDSA,it loads the provisioned certificate and present it.
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TODO when using ECDSA,it uses the generated key instead of loading key */
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/* Initialize the server address struct with zeros */
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memset(&servAddr, 0, sizeof(servAddr));
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/* Fill in the server address */
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servAddr.sin_family = AF_INET; /* using IPv4 */
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servAddr.sin_port = htons(TLS_SMP_DEFAULT_PORT); /* on port */
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servAddr.sin_addr.s_addr = INADDR_ANY; /* from anywhere */
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/* Bind the server socket to our port */
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if (bind(sockfd, (struct sockaddr*)&servAddr, sizeof(servAddr)) == -1) {
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ESP_LOGE(TAG, "ERROR: failed to bind");
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}
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/* Listen for a new connection, allow 5 pending connections */
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if (listen(sockfd, 5) == -1) {
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ESP_LOGE(TAG, "ERROR: failed to listen");
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}
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#if defined(WOLFSSL_ESPWROOM32SE) && defined(HAVE_PK_CALLBACKS) \
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&& defined(WOLFSSL_ATECC508A)
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atcatls_set_callbacks(ctx);
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/* when using a custom slot allocation */
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#if defined(CUSTOM_SLOT_ALLOCATION)
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my_atmel_slotInit();
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atmel_set_slot_allocator(my_atmel_alloc, my_atmel_free);
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#endif
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#endif
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ESP_LOGI(TAG, "accept clients...");
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/* Continue to accept clients until shutdown is issued */
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while (!shutdown) {
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ESP_LOGI(TAG, "Stack used: %d\n", CONFIG_ESP_MAIN_TASK_STACK_SIZE
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- uxTaskGetStackHighWaterMark(NULL));
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WOLFSSL_MSG("Waiting for a connection...");
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wifi_show_ip();
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/* Accept client socket connections */
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if ((connd = accept(sockfd, (struct sockaddr*)&clientAddr, &size))
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== -1) {
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ESP_LOGE(TAG, "ERROR: failed to accept the connection");
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}
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/* Create a WOLFSSL object */
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if ((ssl = wolfSSL_new(ctx)) == NULL) {
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ESP_LOGE(TAG, "ERROR: failed to create WOLFSSL object");
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}
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/* show what cipher connected for this WOLFSSL* object */
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ShowCiphers(ssl);
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/* Attach wolfSSL to the socket */
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wolfSSL_set_fd(ssl, connd);
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/* Establish TLS connection */
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ret = wolfSSL_accept(ssl);
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if (ret == SSL_SUCCESS) {
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ShowCiphers(ssl);
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}
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else {
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ESP_LOGE(TAG, "wolfSSL_accept error %d",
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wolfSSL_get_error(ssl, ret));
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}
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WOLFSSL_MSG("Client connected successfully");
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ESP_LOGI(TAG, "Stack used: %d\n", CONFIG_ESP_MAIN_TASK_STACK_SIZE
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- uxTaskGetStackHighWaterMark(NULL));
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/* Read the client data into our buff array */
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memset(buff, 0, sizeof(buff));
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if (wolfSSL_read(ssl, buff, sizeof(buff)-1) == -1) {
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ESP_LOGE(TAG, "ERROR: failed to read");
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}
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/* Print to stdout any data the client sends */
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ESP_LOGI(TAG, "Stack used: %d\n", CONFIG_ESP_MAIN_TASK_STACK_SIZE
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- uxTaskGetStackHighWaterMark(NULL));
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WOLFSSL_MSG("Client sends:");
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WOLFSSL_MSG(buff);
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/* Check for server shutdown command */
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if (strncmp(buff, "shutdown", 8) == 0) {
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WOLFSSL_MSG("Shutdown command issued!");
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shutdown = 1;
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}
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/* Write our reply into buff */
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memset(buff, 0, sizeof(buff));
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memcpy(buff, msg, sizeof(msg));
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len = strnlen(buff, sizeof(buff));
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/* Reply back to the client */
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if (wolfSSL_write(ssl, buff, len) != len) {
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ESP_LOGE(TAG, "ERROR: failed to write");
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}
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/* Cleanup after this connection */
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wolfSSL_free(ssl); /* Free the wolfSSL object */
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close(connd); /* Close the connection to the client */
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}
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/* Cleanup and return */
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wolfSSL_free(ssl); /* Free the wolfSSL object */
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wolfSSL_CTX_free(ctx); /* Free the wolfSSL context object */
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wolfSSL_Cleanup(); /* Cleanup the wolfSSL environment */
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close(sockfd); /* Close the socket listening for clients */
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vTaskDelete(NULL);
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return TLS_SMP_SERVER_TASK_RET;
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}
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#if defined(SINGLE_THREADED)
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/* we don't initialize a thread */
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#else
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/* create task */
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WOLFSSL_ESP_TASK tls_smp_server_init(void* args)
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{
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#if defined(SINGLE_THREADED)
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#define TLS_SMP_CLIENT_TASK_RET ret
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#else
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#define TLS_SMP_CLIENT_TASK_RET
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#endif
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int thisPort = 0;
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int ret_i = 0; /* interim return result */
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if (thisPort == 0) {
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thisPort = TLS_SMP_DEFAULT_PORT;
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}
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#if ESP_IDF_VERSION_MAJOR >= 4
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TaskHandle_t _handle;
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#else
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xTaskHandle _handle;
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#endif
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/* http://esp32.info/docs/esp_idf/html/dd/d3c/group__xTaskCreate.html */
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ESP_LOGI(TAG, "Creating tls_smp_server_task with stack size = %d",
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TLS_SMP_SERVER_TASK_WORDS);
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ret_i = xTaskCreate(tls_smp_server_task,
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TLS_SMP_SERVER_TASK_NAME,
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TLS_SMP_SERVER_TASK_WORDS, /* not bytes! */
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(void*)&thisPort,
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TLS_SMP_SERVER_TASK_PRIORITY,
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&_handle);
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if (ret_i != pdPASS) {
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ESP_LOGI(TAG, "create thread %s failed", TLS_SMP_SERVER_TASK_NAME);
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}
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/* vTaskStartScheduler(); // called automatically in ESP-IDF */
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return TLS_SMP_CLIENT_TASK_RET;
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}
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#endif
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