| /* Minimal DTLS server. |
| * (Meant to be used with config-threadnet.h) |
| * |
| * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| * |
| * This file is part of mbed TLS (https://tls.mbed.org) |
| */ |
| |
| #include <zephyr.h> |
| #include <stdio.h> |
| |
| #include <errno.h> |
| #include <misc/printk.h> |
| |
| #if !defined(CONFIG_MBEDTLS_CFG_FILE) |
| #include "mbedtls/config.h" |
| #else |
| #include CONFIG_MBEDTLS_CFG_FILE |
| #endif |
| |
| #if defined(MBEDTLS_PLATFORM_C) |
| #include "mbedtls/platform.h" |
| #else |
| #include <stdlib.h> |
| #define mbedtls_time_t time_t |
| #define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS |
| #define MBEDTLS_EXIT_FAILURE EXIT_FAILURE |
| #endif |
| |
| #include <string.h> |
| #include <net/net_context.h> |
| #include <net/net_if.h> |
| #include "udp.h" |
| #include "udp_cfg.h" |
| |
| #include "mbedtls/net.h" |
| #include "mbedtls/ssl.h" |
| #include "mbedtls/entropy.h" |
| #include "mbedtls/ctr_drbg.h" |
| #include "mbedtls/ssl_cookie.h" |
| |
| #if defined(MBEDTLS_DEBUG_C) |
| #include "mbedtls/debug.h" |
| #endif |
| |
| #if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C) |
| #include "mbedtls/memory_buffer_alloc.h" |
| static unsigned char heap[20480]; |
| #endif |
| |
| #define DEBUG_THRESHOLD 0 |
| /* |
| * Hardcoded values for server host and port |
| */ |
| |
| const char *pers = "dtsl_server"; |
| |
| #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) |
| #define ECJPAKE_PW_SIZE 6 |
| const unsigned char ecjpake_pw[ECJPAKE_PW_SIZE] = "passwd"; |
| #endif |
| |
| struct dtls_timing_context { |
| uint32_t snapshot; |
| uint32_t int_ms; |
| uint32_t fin_ms; |
| }; |
| |
| static void my_debug(void *ctx, int level, |
| const char *file, int line, const char *str) |
| { |
| const char *p, *basename; |
| |
| ARG_UNUSED(ctx); |
| |
| /* Extract basename from file */ |
| for (p = basename = file; *p != '\0'; p++) { |
| if (*p == '/' || *p == '\\') { |
| basename = p + 1; |
| } |
| |
| } |
| |
| mbedtls_printf("%s:%04d: |%d| %s", basename, line, level, str); |
| } |
| |
| void dtls_timing_set_delay(void *data, uint32_t int_ms, uint32_t fin_ms) |
| { |
| struct dtls_timing_context *ctx = (struct dtls_timing_context *)data; |
| |
| ctx->int_ms = int_ms; |
| ctx->fin_ms = fin_ms; |
| |
| if (fin_ms != 0) { |
| ctx->snapshot = k_uptime_get_32(); |
| } |
| } |
| |
| int dtls_timing_get_delay(void *data) |
| { |
| struct dtls_timing_context *ctx = (struct dtls_timing_context *)data; |
| unsigned long elapsed_ms; |
| |
| if (ctx->fin_ms == 0) { |
| return -1; |
| } |
| |
| elapsed_ms = k_uptime_get_32() - ctx->snapshot; |
| |
| if (elapsed_ms >= ctx->fin_ms) { |
| return 2; |
| } |
| |
| if (elapsed_ms >= ctx->int_ms) { |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| static int entropy_source(void *data, unsigned char *output, size_t len, |
| size_t *olen) |
| { |
| uint32_t seed; |
| char *ptr = data; |
| |
| ARG_UNUSED(data); |
| |
| seed = sys_rand32_get(); |
| |
| if (!seed) { |
| seed = 7; |
| } |
| |
| for (size_t i = 0; i < len; i++) { |
| seed ^= seed << 13; |
| seed ^= seed >> 17; |
| seed ^= seed << 5; |
| *ptr++ = (char)seed; |
| } |
| |
| *olen = len; |
| return 0; |
| } |
| |
| unsigned char payload[256]; |
| |
| void dtls_server(void) |
| { |
| int len, ret = 0; |
| struct udp_context ctx; |
| struct dtls_timing_context timer; |
| |
| mbedtls_ssl_cookie_ctx cookie_ctx; |
| mbedtls_entropy_context entropy; |
| mbedtls_ctr_drbg_context ctr_drbg; |
| mbedtls_ssl_context ssl; |
| mbedtls_ssl_config conf; |
| |
| mbedtls_ctr_drbg_init(&ctr_drbg); |
| |
| mbedtls_platform_set_printf(printk); |
| |
| #if defined(MBEDTLS_DEBUG_C) |
| mbedtls_debug_set_threshold(DEBUG_THRESHOLD); |
| #endif |
| |
| /* |
| * Initialize and setup |
| */ |
| mbedtls_ssl_init(&ssl); |
| mbedtls_ssl_config_init(&conf); |
| |
| mbedtls_printf("\n . Seeding the random number generator..."); |
| mbedtls_entropy_init(&entropy); |
| mbedtls_entropy_add_source(&entropy, entropy_source, NULL, |
| MBEDTLS_ENTROPY_MAX_GATHER, |
| MBEDTLS_ENTROPY_SOURCE_STRONG); |
| |
| ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy, |
| (const unsigned char *)pers, strlen(pers)); |
| if (ret != 0) { |
| mbedtls_printf |
| (" failed\n ! mbedtls_ctr_drbg_seed returned -0x%x\n", |
| -ret); |
| goto exit; |
| } |
| |
| mbedtls_printf(" ok\n"); |
| |
| mbedtls_printf(" . Setting up the DTLS structure..."); |
| ret = mbedtls_ssl_config_defaults(&conf, |
| MBEDTLS_SSL_IS_SERVER, |
| MBEDTLS_SSL_TRANSPORT_DATAGRAM, |
| MBEDTLS_SSL_PRESET_DEFAULT); |
| if (ret != 0) { |
| mbedtls_printf(" failed! returned -0x%x\n\n", -ret); |
| goto exit; |
| } |
| |
| /* Modify this to change the default timeouts for the DTLS handshake */ |
| /* mbedtls_ssl_conf_handshake_timeout( &conf, min, max ); */ |
| |
| mbedtls_ssl_conf_rng(&conf, mbedtls_ctr_drbg_random, &ctr_drbg); |
| mbedtls_ssl_conf_dbg(&conf, my_debug, NULL); |
| |
| #if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C) |
| mbedtls_memory_buffer_alloc_init(heap, sizeof(heap)); |
| #endif |
| ret = mbedtls_ssl_cookie_setup(&cookie_ctx, mbedtls_ctr_drbg_random, |
| &ctr_drbg); |
| if (ret != 0) { |
| printf(" failed\n ! mbedtls_ssl_cookie_setup returned -0x%x\n", |
| -ret); |
| goto exit; |
| } |
| |
| mbedtls_ssl_conf_dtls_cookies(&conf, mbedtls_ssl_cookie_write, |
| mbedtls_ssl_cookie_check, &cookie_ctx); |
| |
| ret = mbedtls_ssl_setup(&ssl, &conf); |
| if (ret != 0) { |
| mbedtls_printf |
| (" failed\n ! mbedtls_ssl_setup returned -0x%x\n", -ret); |
| goto exit; |
| } |
| |
| mbedtls_printf(" ok\n"); |
| |
| /* |
| * Start the connection |
| */ |
| |
| mbedtls_printf(" . Setting connection\n"); |
| |
| ret = udp_init(&ctx); |
| if (ret != 0) { |
| mbedtls_printf(" failed! udp_init returned -0x%x\n", -ret); |
| goto exit; |
| } |
| |
| mbedtls_printf(" ok\n"); |
| |
| reset: |
| mbedtls_ssl_session_reset(&ssl); |
| |
| #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) |
| mbedtls_printf(" . Setting up ecjpake password ..."); |
| ret = mbedtls_ssl_set_hs_ecjpake_password(&ssl, ecjpake_pw, |
| ECJPAKE_PW_SIZE); |
| if (ret != 0) { |
| mbedtls_printf(" failed! set ecjpake password returned -%d\n\n", |
| -ret); |
| goto exit; |
| } |
| #endif |
| mbedtls_printf(" ok\n"); |
| |
| mbedtls_ssl_set_timer_cb(&ssl, &timer, dtls_timing_set_delay, |
| dtls_timing_get_delay); |
| |
| mbedtls_ssl_set_bio(&ssl, &ctx, udp_tx, udp_rx, NULL); |
| |
| /* For HelloVerifyRequest cookies */ |
| ctx.client_id = (char)ctx.remaining; |
| |
| ret = mbedtls_ssl_set_client_transport_id(&ssl, &ctx.client_id, |
| sizeof(char)); |
| if (ret != 0) { |
| mbedtls_printf(" failed\n ! " |
| "mbedtls_ssl_set_client_transport_id()" |
| " returned -0x%x\n\n", -ret); |
| goto exit; |
| } |
| |
| mbedtls_printf(" . Performing the TLS handshake..."); |
| |
| do { |
| ret = mbedtls_ssl_handshake(&ssl); |
| } while (ret == MBEDTLS_ERR_SSL_WANT_READ || |
| ret == MBEDTLS_ERR_SSL_WANT_WRITE); |
| |
| if (ret == MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED) { |
| mbedtls_printf(" hello verification requested\n"); |
| ret = 0; |
| goto reset; |
| } |
| |
| if (ret != 0) { |
| mbedtls_printf |
| (" failed\n ! mbedtls_ssl_handshake returned -0x%x\n", |
| -ret); |
| goto reset; |
| } |
| |
| mbedtls_printf(" ok\n"); |
| |
| do { |
| /* Read the request */ |
| mbedtls_printf(" < Read from client:"); |
| len = sizeof(payload) - 1; |
| memset(payload, 0, sizeof(payload)); |
| ret = mbedtls_ssl_read(&ssl, payload, len); |
| |
| if (ret == MBEDTLS_ERR_SSL_WANT_READ || |
| ret == MBEDTLS_ERR_SSL_WANT_WRITE) { |
| continue; |
| } |
| |
| if (ret <= 0) { |
| switch (ret) { |
| case MBEDTLS_ERR_SSL_TIMEOUT: |
| mbedtls_printf(" timeout\n"); |
| goto reset; |
| |
| case MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY: |
| mbedtls_printf(" connection was closed" |
| " gracefully\n"); |
| ret = 0; |
| goto close_notify; |
| |
| default: |
| mbedtls_printf(" mbedtls_ssl_read" |
| " returned -0x%x\n", -ret); |
| goto reset; |
| } |
| } |
| |
| len = ret; |
| mbedtls_printf(" %d bytes read\n\n%s\n\n", len, payload); |
| |
| /* Write the response */ |
| mbedtls_printf(" > Write to client:"); |
| |
| do { |
| ret = mbedtls_ssl_write(&ssl, payload, len); |
| } while (ret == MBEDTLS_ERR_SSL_WANT_READ || |
| ret == MBEDTLS_ERR_SSL_WANT_WRITE); |
| |
| if (ret < 0) { |
| mbedtls_printf(" failed\n ! mbedtls_ssl_write" |
| " returned -%d\n\n", -ret); |
| goto exit; |
| } |
| |
| len = ret; |
| mbedtls_printf(" %d bytes written\n\n%s\n\n", len, payload); |
| } while (1); |
| |
| close_notify: |
| mbedtls_printf(" . Closing the connection..."); |
| /* No error checking, the connection might be closed already */ |
| do { |
| ret = mbedtls_ssl_close_notify(&ssl); |
| } while (ret == MBEDTLS_ERR_SSL_WANT_WRITE); |
| ret = 0; |
| mbedtls_printf(" done\n"); |
| goto reset; |
| |
| exit: |
| mbedtls_ssl_free(&ssl); |
| mbedtls_ssl_config_free(&conf); |
| mbedtls_ctr_drbg_free(&ctr_drbg); |
| mbedtls_entropy_free(&entropy); |
| } |
| |
| #define STACK_SIZE 8192 |
| uint8_t stack[STACK_SIZE]; |
| |
| static inline int init_app(void) |
| { |
| #if defined(CONFIG_NET_IPV6) |
| #if defined(CONFIG_NET_SAMPLES_MY_IPV6_ADDR) |
| if (net_addr_pton(AF_INET6, CONFIG_NET_SAMPLES_MY_IPV6_ADDR, |
| &server_addr) < 0) { |
| mbedtls_printf("Invalid IPv6 address %s", |
| CONFIG_NET_SAMPLES_MY_IPV6_ADDR); |
| } |
| #endif |
| if (!net_if_ipv6_addr_add(net_if_get_default(), &server_addr, |
| NET_ADDR_MANUAL, 0)) { |
| return -EIO; |
| } |
| |
| net_if_ipv6_maddr_add(net_if_get_default(), &mcast_addr); |
| |
| #else |
| #if defined(CONFIG_NET_SAMPLES_MY_IPV4_ADDR) |
| if (net_addr_pton(AF_INET, CONFIG_NET_SAMPLES_MY_IPV4_ADDR, |
| &server_addr) < 0) { |
| mbedtls_printf("Invalid IPv4 address %s", |
| CONFIG_NET_SAMPLES_MY_IPV4_ADDR); |
| } |
| #endif |
| |
| if (!net_if_ipv4_addr_add(net_if_get_default(), &server_addr, |
| NET_ADDR_MANUAL, 0)) { |
| return -EIO; |
| } |
| #endif |
| return 0; |
| } |
| |
| void main(void) |
| { |
| if (init_app() != 0) { |
| printf("Cannot initialize network\n"); |
| return; |
| } |
| |
| k_thread_spawn(stack, STACK_SIZE, (k_thread_entry_t) dtls_server, |
| NULL, NULL, NULL, K_PRIO_COOP(7), 0, 0); |
| |
| } |