mirror of
https://github.com/espressif/esp-idf.git
synced 2025-10-30 20:51:41 +00:00
488 lines
17 KiB
C
488 lines
17 KiB
C
/* SSL server using plain mbedTLS sockets
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*
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* Adapted from the ssl_server example in mbedtls.
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*
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* SPDX-FileCopyrightText: The Mbed TLS Contributors
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* SPDX-FileContributor: 2019-2022 Espressif Systems (Shanghai) CO LTD
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*/
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#include "esp_err.h"
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#include "esp_log.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "freertos/semphr.h"
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#include "mbedtls/entropy.h"
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#include "mbedtls/ctr_drbg.h"
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#include "mbedtls/x509.h"
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#include "mbedtls/ssl.h"
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#include "entropy_poll.h"
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#include "mbedtls/net_sockets.h"
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#include "mbedtls/error.h"
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#include "mbedtls/debug.h"
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#include "mbedtls/esp_debug.h"
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#include "esp_crt_bundle.h"
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#include "esp_random.h"
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#include "unity.h"
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#include "test_utils.h"
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#include "unity_test_utils.h"
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#define SERVER_ADDRESS "localhost"
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#define SERVER_PORT "4433"
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extern const uint8_t server_cert_chain_pem_start[] asm("_binary_server_cert_chain_pem_start");
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extern const uint8_t server_cert_chain_pem_end[] asm("_binary_server_cert_chain_pem_end");
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extern const uint8_t server_pk_start[] asm("_binary_prvtkey_pem_start");
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extern const uint8_t server_pk_end[] asm("_binary_prvtkey_pem_end");
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extern const uint8_t server_cert_bundle_start[] asm("_binary_server_cert_bundle_start");
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extern const uint8_t server_cert_bundle_end[] asm("_binary_server_cert_bundle_end");
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extern const uint8_t bad_md_crt_pem_start[] asm("_binary_bad_md_crt_pem_start");
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extern const uint8_t bad_md_crt_pem_end[] asm("_binary_bad_md_crt_pem_end");
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extern const uint8_t wrong_sig_crt_pem_start[] asm("_binary_wrong_sig_crt_esp32_com_pem_start");
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extern const uint8_t wrong_sig_crt_pem_end[] asm("_binary_wrong_sig_crt_esp32_com_pem_end");
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extern const uint8_t correct_sig_crt_pem_start[] asm("_binary_correct_sig_crt_esp32_com_pem_start");
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extern const uint8_t correct_sig_crt_pem_end[] asm("_binary_correct_sig_crt_esp32_com_pem_end");
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#define SEM_TIMEOUT 10000
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typedef struct {
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mbedtls_ssl_context ssl;
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mbedtls_net_context listen_fd;
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mbedtls_net_context client_fd;
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mbedtls_entropy_context entropy;
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mbedtls_ctr_drbg_context ctr_drbg;
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mbedtls_ssl_config conf;
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mbedtls_x509_crt cert;
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mbedtls_pk_context pkey;
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} mbedtls_endpoint_t;
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typedef enum {
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ESP_CRT_VALIDATE_UNKNOWN,
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ESP_CRT_VALIDATE_OK,
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ESP_CRT_VALIDATE_FAIL,
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}esp_crt_validate_res_t;
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int esp_crt_verify_callback(void *buf, mbedtls_x509_crt *crt, int data, uint32_t *flags);
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static const char *TAG = "cert_bundle_test";
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static volatile bool exit_flag;
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esp_err_t endpoint_teardown(mbedtls_endpoint_t *endpoint);
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static int myrand(void *rng_state, unsigned char *output, size_t len)
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{
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size_t olen;
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return mbedtls_hardware_poll(rng_state, output, len, &olen);
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}
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esp_err_t server_setup(mbedtls_endpoint_t *server)
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{
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int ret;
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mbedtls_ssl_config_init( &server->conf );
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#if CONFIG_MBEDTLS_DEBUG
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mbedtls_esp_enable_debug_log( &server->conf, CONFIG_MBEDTLS_DEBUG_LEVEL );
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#endif
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mbedtls_net_init( &server->listen_fd );
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mbedtls_net_init( &server->client_fd );
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mbedtls_ssl_init( &server->ssl );
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mbedtls_x509_crt_init( &server->cert );
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mbedtls_pk_init( &server->pkey );
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mbedtls_entropy_init( &server->entropy );
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mbedtls_ctr_drbg_init( &server->ctr_drbg );
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ESP_LOGI(TAG, "Loading the server cert and key");
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ret = mbedtls_x509_crt_parse( &server->cert, server_cert_chain_pem_start,
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server_cert_chain_pem_end - server_cert_chain_pem_start);
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if ( ret != 0 ) {
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ESP_LOGE(TAG, "mbedtls_x509_crt_parse returned %d", ret );
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return ESP_FAIL;
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}
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ret = mbedtls_pk_parse_key( &server->pkey, (const unsigned char *)server_pk_start,
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server_pk_end - server_pk_start, NULL, 0, myrand, NULL );
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if ( ret != 0 ) {
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ESP_LOGE(TAG, "mbedtls_pk_parse_key returned %d", ret );
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return ESP_FAIL;
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}
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ESP_LOGI(TAG, "Bind on https://%s:%s/", SERVER_ADDRESS, SERVER_PORT );
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if ( ( ret = mbedtls_net_bind( &server->listen_fd, NULL, SERVER_PORT, MBEDTLS_NET_PROTO_TCP ) ) != 0 ) {
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ESP_LOGE(TAG, "mbedtls_net_bind returned %d", ret );
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return ESP_FAIL;
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}
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mbedtls_net_set_nonblock(&server->listen_fd);
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ESP_LOGI(TAG, "Seeding the random number generator");
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if ( ( ret = mbedtls_ctr_drbg_seed( &server->ctr_drbg, mbedtls_entropy_func, &server->entropy,
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NULL, 0) ) != 0 ) {
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ESP_LOGE(TAG, "mbedtls_ctr_drbg_seed returned %d", ret );
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return ESP_FAIL;
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}
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ESP_LOGI(TAG, "Setting up the SSL data");
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if ( ( ret = mbedtls_ssl_config_defaults( &server->conf,
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MBEDTLS_SSL_IS_SERVER,
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MBEDTLS_SSL_TRANSPORT_STREAM,
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MBEDTLS_SSL_PRESET_DEFAULT ) ) != 0 ) {
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ESP_LOGE(TAG, "mbedtls_ssl_config_defaults returned %d", ret );
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return ESP_FAIL;
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}
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mbedtls_ssl_conf_rng( &server->conf, mbedtls_ctr_drbg_random, &server->ctr_drbg );
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if (( ret = mbedtls_ssl_conf_own_cert( &server->conf, &server->cert, &server->pkey ) ) != 0 ) {
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ESP_LOGE(TAG, "mbedtls_ssl_conf_own_cert returned %d", ret );
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return ESP_FAIL;
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}
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if (( ret = mbedtls_ssl_setup( &server->ssl, &server->conf ) ) != 0 ) {
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ESP_LOGE(TAG, "mbedtls_ssl_setup returned %d", ret );
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return ESP_FAIL;
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}
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return ESP_OK;
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}
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void server_task(void *pvParameters)
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{
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int ret;
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mbedtls_endpoint_t server;
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SemaphoreHandle_t *sema = (SemaphoreHandle_t *) pvParameters;
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if (server_setup(&server) != ESP_OK) {
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ESP_LOGE(TAG, "SSL server setup failed");
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goto exit;
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}
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/* Signal that server is up and hence client task can start now */
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xSemaphoreGive(*sema);
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bool connected = false;
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while (!exit_flag) {
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ret = mbedtls_net_accept( &server.listen_fd, &server.client_fd, NULL, 0, NULL );
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if (ret == 0) {
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connected = true;
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}
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if (connected) {
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mbedtls_ssl_set_bio( &server.ssl, &server.client_fd, mbedtls_net_send, mbedtls_net_recv, NULL );
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ret = mbedtls_ssl_handshake( &server.ssl );
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mbedtls_ssl_session_reset(&server.ssl);
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connected = false;
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}
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vTaskDelay(20 / portTICK_PERIOD_MS);
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}
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ESP_LOGE(TAG, "Server shutdown");
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exit:
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endpoint_teardown(&server);
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xSemaphoreGive(*sema);
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vTaskSuspend(NULL);
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}
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esp_err_t endpoint_teardown(mbedtls_endpoint_t *endpoint)
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{
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mbedtls_net_free( &endpoint->client_fd );
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mbedtls_net_free( &endpoint->listen_fd );
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mbedtls_x509_crt_free( &endpoint->cert );
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mbedtls_pk_free( &endpoint->pkey );
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mbedtls_ssl_free( &endpoint->ssl );
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mbedtls_ssl_config_free( &endpoint->conf );
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mbedtls_ctr_drbg_free( &endpoint->ctr_drbg );
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mbedtls_entropy_free( &endpoint->entropy );
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return ESP_OK;
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}
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esp_err_t client_setup(mbedtls_endpoint_t *client)
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{
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int ret;
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mbedtls_ssl_config_init( &client->conf );
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#if CONFIG_MBEDTLS_DEBUG
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mbedtls_esp_enable_debug_log( &client->conf, CONFIG_MBEDTLS_DEBUG_LEVEL );
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#endif
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mbedtls_net_init( &client->client_fd );
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mbedtls_ssl_init( &client->ssl );
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mbedtls_x509_crt_init( &client->cert );
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mbedtls_pk_init( &client->pkey );
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mbedtls_entropy_init( &client->entropy );
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mbedtls_ctr_drbg_init( &client->ctr_drbg );
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ESP_LOGI(TAG, "Seeding the random number generator");
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if ((ret = mbedtls_ctr_drbg_seed(&client->ctr_drbg, mbedtls_entropy_func, &client->entropy,
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NULL, 0)) != 0) {
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ESP_LOGE(TAG, "mbedtls_ctr_drbg_seed returned %d", ret);
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return ESP_FAIL;
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}
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ESP_LOGI(TAG, "Setting hostname for TLS session...");
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/* Hostname set here should match CN in server certificate */
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if ((ret = mbedtls_ssl_set_hostname(&client->ssl, SERVER_ADDRESS)) != 0) {
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ESP_LOGE(TAG, "mbedtls_ssl_set_hostname returned -0x%x", -ret);
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return ESP_FAIL;
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}
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ESP_LOGI(TAG, "Setting up the SSL/TLS structure...");
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if ((ret = mbedtls_ssl_config_defaults(&client->conf,
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MBEDTLS_SSL_IS_CLIENT,
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MBEDTLS_SSL_TRANSPORT_STREAM,
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MBEDTLS_SSL_PRESET_DEFAULT)) != 0) {
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ESP_LOGE(TAG, "mbedtls_ssl_config_defaults returned %d", ret);
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return ESP_FAIL;
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}
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mbedtls_ssl_conf_rng(&client->conf, mbedtls_ctr_drbg_random, &client->ctr_drbg);
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if ((ret = mbedtls_ssl_setup(&client->ssl, &client->conf)) != 0) {
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ESP_LOGE(TAG, "mbedtls_ssl_setup returned -0x%x\n\n", -ret);
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return ESP_FAIL;
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}
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return ESP_OK;
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}
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void client_task(void *pvParameters)
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{
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SemaphoreHandle_t *client_signal_sem = (SemaphoreHandle_t *) pvParameters;
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int ret = ESP_FAIL;
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mbedtls_endpoint_t client;
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esp_crt_validate_res_t res = ESP_CRT_VALIDATE_UNKNOWN;
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if (client_setup(&client) != ESP_OK) {
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ESP_LOGE(TAG, "SSL client setup failed");
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goto exit;
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}
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/* Test with default crt bundle that doesnt contain the ca crt */
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ESP_LOGI(TAG, "Connecting to %s:%s...", SERVER_ADDRESS, SERVER_PORT);
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if ((ret = mbedtls_net_connect(&client.client_fd, SERVER_ADDRESS, SERVER_PORT, MBEDTLS_NET_PROTO_TCP)) != 0) {
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ESP_LOGE(TAG, "mbedtls_net_connect returned -%x", -ret);
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goto exit;
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}
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ESP_LOGI(TAG, "Connected.");
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mbedtls_ssl_set_bio(&client.ssl, &client.client_fd, mbedtls_net_send, mbedtls_net_recv, NULL);
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ESP_LOGI(TAG, "Performing the SSL/TLS handshake with bundle that is missing the server root certificate");
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while ( ( ret = mbedtls_ssl_handshake( &client.ssl ) ) != 0 ) {
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if ( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE ) {
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printf( "mbedtls_ssl_handshake failed with -0x%x\n", -ret );
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break;
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}
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}
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ESP_LOGI(TAG, "Verifying peer X.509 certificate for bundle ...");
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ret = mbedtls_ssl_get_verify_result(&client.ssl);
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res = (ret == 0) ? ESP_CRT_VALIDATE_OK : ESP_CRT_VALIDATE_FAIL;
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if (res == ESP_CRT_VALIDATE_OK) {
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ESP_LOGI(TAG, "Certificate verification passed!");
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} else {
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ESP_LOGE(TAG, "Certificate verification failed!");
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}
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TEST_ASSERT(res == ESP_CRT_VALIDATE_FAIL);
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// Reset session before new connection
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mbedtls_ssl_close_notify(&client.ssl);
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mbedtls_ssl_session_reset(&client.ssl);
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mbedtls_net_free( &client.client_fd);
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/* Test with bundle that does contain the CA crt */
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esp_crt_bundle_attach(&client.conf);
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esp_crt_bundle_set(server_cert_bundle_start, server_cert_bundle_end - server_cert_bundle_start);
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ESP_LOGI(TAG, "Connecting to %s:%s...", SERVER_ADDRESS, SERVER_PORT);
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if ((ret = mbedtls_net_connect(&client.client_fd, SERVER_ADDRESS, SERVER_PORT, MBEDTLS_NET_PROTO_TCP)) != 0) {
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ESP_LOGE(TAG, "mbedtls_net_connect returned -%x", -ret);
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goto exit;
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}
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ESP_LOGI(TAG, "Connected.");
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mbedtls_ssl_set_bio(&client.ssl, &client.client_fd, mbedtls_net_send, mbedtls_net_recv, NULL);
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ESP_LOGI(TAG, "Performing the SSL/TLS handshake with bundle that is missing the server root certificate");
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while ( ( ret = mbedtls_ssl_handshake( &client.ssl ) ) != 0 ) {
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if ( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE ) {
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printf( "mbedtls_ssl_handshake failed with -0x%x\n", -ret );
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break;
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}
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}
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ESP_LOGI(TAG, "Verifying peer X.509 certificate for bundle ...");
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ret = mbedtls_ssl_get_verify_result(&client.ssl);
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res = (ret == 0) ? ESP_CRT_VALIDATE_OK : ESP_CRT_VALIDATE_FAIL;
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if (res == ESP_CRT_VALIDATE_OK) {
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ESP_LOGI(TAG, "Certificate verification passed!");
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} else {
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ESP_LOGE(TAG, "Certificate verification failed!");
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}
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TEST_ASSERT(res == ESP_CRT_VALIDATE_OK);
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// Reset session before new connection
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mbedtls_ssl_close_notify(&client.ssl);
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mbedtls_ssl_session_reset(&client.ssl);
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mbedtls_net_free( &client.client_fd);
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exit:
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mbedtls_ssl_close_notify(&client.ssl);
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mbedtls_ssl_session_reset(&client.ssl);
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esp_crt_bundle_detach(&client.conf);
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endpoint_teardown(&client);
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xSemaphoreGive(*client_signal_sem);
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vTaskSuspend(NULL);
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}
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TEST_CASE("custom certificate bundle", "[mbedtls]")
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{
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test_case_uses_tcpip();
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SemaphoreHandle_t signal_sem = xSemaphoreCreateBinary();
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TEST_ASSERT_NOT_NULL(signal_sem);
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exit_flag = false;
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TaskHandle_t server_task_handle;
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xTaskCreate(server_task, "server task", 8192, &signal_sem, 10, &server_task_handle);
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// Wait for the server to start up
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if (!xSemaphoreTake(signal_sem, SEM_TIMEOUT / portTICK_PERIOD_MS)) {
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TEST_FAIL_MESSAGE("signal_sem not released, server start failed");
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}
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SemaphoreHandle_t client_signal_sem = xSemaphoreCreateBinary();
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TEST_ASSERT_NOT_NULL(client_signal_sem);
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TaskHandle_t client_task_handle;
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xTaskCreate(client_task, "client task", 8192, &client_signal_sem, 10, &client_task_handle);
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if (!xSemaphoreTake(client_signal_sem, SEM_TIMEOUT / portTICK_PERIOD_MS)) {
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TEST_FAIL_MESSAGE("client_signal_sem not released, client exit failed");
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}
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unity_utils_task_delete(client_task_handle);
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exit_flag = true;
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if (!xSemaphoreTake(signal_sem, SEM_TIMEOUT / portTICK_PERIOD_MS)) {
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TEST_FAIL_MESSAGE("signal_sem not released, server exit failed");
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}
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unity_utils_task_delete(server_task_handle);
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vSemaphoreDelete(client_signal_sem);
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vSemaphoreDelete(signal_sem);
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}
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TEST_CASE("custom certificate bundle - weak hash", "[mbedtls]")
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{
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/* A weak signature hash on the trusted certificate should not stop
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us from verifying the chain, since we already trust it a weak signature hash is
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not a security issue */
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mbedtls_x509_crt crt;
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uint32_t flags = 0;
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esp_crt_bundle_attach(NULL);
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mbedtls_x509_crt_init( &crt );
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mbedtls_x509_crt_parse(&crt, bad_md_crt_pem_start, bad_md_crt_pem_end - bad_md_crt_pem_start);
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TEST_ASSERT(mbedtls_x509_crt_verify(&crt, NULL, NULL, NULL, &flags, esp_crt_verify_callback, NULL) == 0);
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mbedtls_x509_crt_free(&crt);
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esp_crt_bundle_detach(NULL);
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}
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TEST_CASE("custom certificate bundle - wrong signature", "[mbedtls]")
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{
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/* Check that the bundle will not verify a valid certificate from trusted root where the signature is wrong */
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mbedtls_x509_crt crt;
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uint32_t flags = 0;
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esp_crt_bundle_attach(NULL);
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mbedtls_x509_crt_init( &crt );
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/* esp32.com cert chain where 1 byte in the signature is changed */
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printf("Testing certificate with wrong signature\n");
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mbedtls_x509_crt_parse(&crt, wrong_sig_crt_pem_start, wrong_sig_crt_pem_end - wrong_sig_crt_pem_start);
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TEST_ASSERT(mbedtls_x509_crt_verify(&crt, NULL, NULL, NULL, &flags, esp_crt_verify_callback, NULL) != 0);
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mbedtls_x509_crt_free(&crt);
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mbedtls_x509_crt_init( &crt );
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/* the correct esp32.com cert chain*/
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printf("Testing certificate with correct signature\n");
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mbedtls_x509_crt_parse(&crt, correct_sig_crt_pem_start, correct_sig_crt_pem_end - correct_sig_crt_pem_start);
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TEST_ASSERT(mbedtls_x509_crt_verify(&crt, NULL, NULL, NULL, &flags, esp_crt_verify_callback, NULL) == 0);
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mbedtls_x509_crt_free(&crt);
|
|
|
|
esp_crt_bundle_detach(NULL);
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|
}
|
|
|
|
TEST_CASE("custom certificate bundle init API - bound checking", "[mbedtls]")
|
|
{
|
|
|
|
uint8_t test_bundle[256] = {0};
|
|
esp_err_t esp_ret;
|
|
/* The API should fail with bundle size given as 1 */
|
|
esp_ret = esp_crt_bundle_set(test_bundle, 1);
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|
TEST_ASSERT( esp_ret == ESP_ERR_INVALID_ARG);
|
|
|
|
/* Check that the esp_crt_bundle_set API will not accept a bundle
|
|
* which has more no. of certs than configured in
|
|
* CONFIG_MBEDTLS_CERTIFICATE_BUNDLE_MAX_CERTS */
|
|
|
|
uint8_t rand;
|
|
esp_fill_random(&rand, 1);
|
|
test_bundle[0] = rand;
|
|
|
|
/* Make sure that the number of certs will always be greater than
|
|
* CONFIG_MBEDTLS_CERTIFICATE_BUNDLE_MAX_CERTS */
|
|
test_bundle[1] = rand + CONFIG_MBEDTLS_CERTIFICATE_BUNDLE_MAX_CERTS;
|
|
|
|
esp_ret = esp_crt_bundle_set(test_bundle, sizeof(test_bundle));
|
|
TEST_ASSERT( esp_ret == ESP_ERR_INVALID_ARG);
|
|
|
|
/* The API should fail with bundle_size < BUNDLE_HEADER_OFFSET (2) + CRT_HEADER_OFFSET (4) */
|
|
test_bundle[0] = 0;
|
|
test_bundle[1] = 1; /* set num_certs = 1 */
|
|
esp_ret = esp_crt_bundle_set(test_bundle, 5);
|
|
TEST_ASSERT(esp_ret == ESP_ERR_INVALID_ARG);
|
|
|
|
/* Cert number is greater than actual certs present, The API should fail */
|
|
/* Actual No. of certs present in bundle = 1, setting num_certs to 5 */
|
|
test_bundle[1] = 5; /* num_certs */
|
|
test_bundle[3] = 5; /* cert_1_name_len */
|
|
test_bundle[5] = 10; /* cert_1_pub_key_len */
|
|
/* Actual bundle size becomes BUNDLE_HEADER_OFFSET (2) + CRT_HEADER_OFFSET (4) + cert_1_name_len(5) + cert_1_pub_key_len(10)
|
|
* i.e. 21 bytes */
|
|
esp_ret = esp_crt_bundle_set(test_bundle, 21);
|
|
TEST_ASSERT(esp_ret == ESP_ERR_INVALID_ARG);
|
|
|
|
/* The API should fail if bundle_size < BUNDLE_HEADER_OFFSET (2) + CRT_HEADER_OFFSET (4) + cert_1_name_len(5) + cert_1_pub_key_len(10) */
|
|
esp_ret = esp_crt_bundle_set(test_bundle, 20);
|
|
TEST_ASSERT(esp_ret == ESP_ERR_INVALID_ARG);
|
|
|
|
esp_crt_bundle_detach(NULL);
|
|
}
|