1021 lines
31 KiB
C
1021 lines
31 KiB
C
/*
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* MbedTLS SSL context deserializer from base64 code
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*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* 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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*
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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, WITHOUT
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* 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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*/
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#define MBEDTLS_ALLOW_PRIVATE_ACCESS
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#include "mbedtls/build_info.h"
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#include "mbedtls/debug.h"
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#include "mbedtls/platform.h"
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#include <stdio.h>
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#include <stdlib.h>
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#if !defined(MBEDTLS_X509_CRT_PARSE_C) || !defined(MBEDTLS_ERROR_C) || \
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!defined(MBEDTLS_SSL_TLS_C)
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int main(void)
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{
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printf("MBEDTLS_X509_CRT_PARSE_C and/or MBEDTLS_ERROR_C and/or "
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"MBEDTLS_SSL_TLS_C not defined.\n");
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return 0;
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}
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#else
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#if defined(_MSC_VER) && !defined(_CRT_SECURE_NO_DEPRECATE)
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#define _CRT_SECURE_NO_DEPRECATE 1
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#endif
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#include <stdint.h>
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#include <stdarg.h>
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#include <string.h>
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#if defined(MBEDTLS_HAVE_TIME)
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#include <time.h>
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#endif
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#include "mbedtls/ssl.h"
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#include "mbedtls/error.h"
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#include "mbedtls/base64.h"
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#include "mbedtls/md.h"
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#include "mbedtls/x509_crt.h"
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#include "mbedtls/ssl_ciphersuites.h"
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/*
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* This program version
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*/
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#define PROG_NAME "ssl_context_info"
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#define VER_MAJOR 0
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#define VER_MINOR 1
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/*
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* Flags copied from the Mbed TLS library.
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*/
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#define SESSION_CONFIG_TIME_BIT (1 << 0)
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#define SESSION_CONFIG_CRT_BIT (1 << 1)
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#define SESSION_CONFIG_CLIENT_TICKET_BIT (1 << 2)
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#define SESSION_CONFIG_MFL_BIT (1 << 3)
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#define SESSION_CONFIG_TRUNC_HMAC_BIT (1 << 4)
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#define SESSION_CONFIG_ETM_BIT (1 << 5)
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#define SESSION_CONFIG_TICKET_BIT (1 << 6)
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#define CONTEXT_CONFIG_DTLS_CONNECTION_ID_BIT (1 << 0)
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#define CONTEXT_CONFIG_DTLS_BADMAC_LIMIT_BIT (1 << 1)
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#define CONTEXT_CONFIG_DTLS_ANTI_REPLAY_BIT (1 << 2)
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#define CONTEXT_CONFIG_ALPN_BIT (1 << 3)
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#define TRANSFORM_RANDBYTE_LEN 64
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/*
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* Minimum and maximum number of bytes for specific data: context, sessions,
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* certificates, tickets and buffers in the program. The context and session
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* size values have been calculated based on the 'print_deserialized_ssl_context()'
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* and 'print_deserialized_ssl_session()' content.
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*/
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#define MIN_CONTEXT_LEN 84
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#define MIN_SESSION_LEN 88
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#define MAX_CONTEXT_LEN 875 /* without session data */
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#define MAX_SESSION_LEN 109 /* without certificate and ticket data */
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#define MAX_CERTIFICATE_LEN ((1 << 24) - 1)
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#define MAX_TICKET_LEN ((1 << 24) - 1)
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#define MIN_SERIALIZED_DATA (MIN_CONTEXT_LEN + MIN_SESSION_LEN)
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#define MAX_SERIALIZED_DATA (MAX_CONTEXT_LEN + MAX_SESSION_LEN + \
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MAX_CERTIFICATE_LEN + MAX_TICKET_LEN)
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#define MIN_BASE64_LEN (MIN_SERIALIZED_DATA * 4 / 3)
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#define MAX_BASE64_LEN (MAX_SERIALIZED_DATA * 4 / 3 + 3)
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/*
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* A macro that prevents from reading out of the ssl buffer range.
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*/
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#define CHECK_SSL_END(LEN) \
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do \
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{ \
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if (end - ssl < (int) (LEN)) \
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{ \
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printf_err("%s", buf_ln_err); \
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return; \
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} \
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} while (0)
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/*
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* Global values
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*/
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FILE *b64_file = NULL; /* file with base64 codes to deserialize */
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char conf_keep_peer_certificate = 1; /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE from mbedTLS configuration */
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char conf_dtls_proto = 1; /* MBEDTLS_SSL_PROTO_DTLS from mbedTLS configuration */
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char debug = 0; /* flag for debug messages */
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const char alloc_err[] = "Cannot allocate memory\n";
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const char buf_ln_err[] = "Buffer does not have enough data to complete the parsing\n";
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/*
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* Basic printing functions
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*/
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void print_version()
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{
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printf("%s v%d.%d\n", PROG_NAME, VER_MAJOR, VER_MINOR);
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}
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void print_usage()
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{
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print_version();
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printf("\nThis program is used to deserialize an Mbed TLS SSL session from the base64 code provided\n"
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"in the text file. The program can deserialize many codes from one file, but they must be\n"
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"separated, e.g. by a newline.\n\n");
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printf(
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"Usage:\n"
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"\t-f path - Path to the file with base64 code\n"
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"\t-v - Show version\n"
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"\t-h - Show this usage\n"
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"\t-d - Print more information\n"
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"\t--keep-peer-cert=0 - Use this option if you know that the Mbed TLS library\n"
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"\t has been compiled with the MBEDTLS_SSL_KEEP_PEER_CERTIFICATE\n"
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"\t flag. You can also use it if there are some problems with reading\n"
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"\t the information about certificate\n"
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"\t--dtls-protocol=0 - Use this option if you know that the Mbed TLS library\n"
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"\t has been compiled without the MBEDTLS_SSL_PROTO_DTLS flag\n"
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"\n"
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);
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}
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void printf_dbg(const char *str, ...)
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{
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if (debug) {
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va_list args;
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va_start(args, str);
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printf("debug: ");
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vprintf(str, args);
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fflush(stdout);
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va_end(args);
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}
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}
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MBEDTLS_PRINTF_ATTRIBUTE(1, 2)
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void printf_err(const char *str, ...)
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{
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va_list args;
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va_start(args, str);
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fflush(stdout);
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fprintf(stderr, "ERROR: ");
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vfprintf(stderr, str, args);
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fflush(stderr);
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va_end(args);
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}
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/*
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* Exit from the program in case of error
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*/
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void error_exit()
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{
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if (NULL != b64_file) {
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fclose(b64_file);
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}
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exit(-1);
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}
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/*
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* This function takes the input arguments of this program
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*/
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void parse_arguments(int argc, char *argv[])
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{
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int i = 1;
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if (argc < 2) {
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print_usage();
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error_exit();
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}
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while (i < argc) {
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if (strcmp(argv[i], "-d") == 0) {
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debug = 1;
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} else if (strcmp(argv[i], "-h") == 0) {
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print_usage();
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} else if (strcmp(argv[i], "-v") == 0) {
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print_version();
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} else if (strcmp(argv[i], "-f") == 0) {
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if (++i >= argc) {
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printf_err("File path is empty\n");
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error_exit();
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}
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if (NULL != b64_file) {
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printf_err("Cannot specify more than one file with -f\n");
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error_exit();
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}
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if ((b64_file = fopen(argv[i], "r")) == NULL) {
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printf_err("Cannot find file \"%s\"\n", argv[i]);
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error_exit();
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}
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} else if (strcmp(argv[i], "--keep-peer-cert=0") == 0) {
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conf_keep_peer_certificate = 0;
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} else if (strcmp(argv[i], "--dtls-protocol=0") == 0) {
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conf_dtls_proto = 0;
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} else {
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print_usage();
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error_exit();
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}
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i++;
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}
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}
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/*
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* This function prints base64 code to the stdout
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*/
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void print_b64(const uint8_t *b, size_t len)
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{
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size_t i = 0;
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const uint8_t *end = b + len;
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printf("\t");
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while (b < end) {
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if (++i > 75) {
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printf("\n\t");
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i = 0;
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}
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printf("%c", *b++);
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}
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printf("\n");
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fflush(stdout);
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}
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/*
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* This function prints hex code from the buffer to the stdout.
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*
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* /p b buffer with data to print
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* /p len number of bytes to print
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* /p in_line number of bytes in one line
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* /p prefix prefix for the new lines
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*/
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void print_hex(const uint8_t *b, size_t len,
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const size_t in_line, const char *prefix)
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{
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size_t i = 0;
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const uint8_t *end = b + len;
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if (prefix == NULL) {
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prefix = "";
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}
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while (b < end) {
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if (++i > in_line) {
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printf("\n%s", prefix);
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i = 1;
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}
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printf("%02X ", (uint8_t) *b++);
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}
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printf("\n");
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fflush(stdout);
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}
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/*
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* Print the value of time_t in format e.g. 2020-01-23 13:05:59
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*/
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void print_time(const uint64_t *time)
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{
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#if defined(MBEDTLS_HAVE_TIME)
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char buf[20];
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struct tm *t = gmtime((time_t *) time);
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static const char format[] = "%Y-%m-%d %H:%M:%S";
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if (NULL != t) {
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strftime(buf, sizeof(buf), format, t);
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printf("%s\n", buf);
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} else {
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printf("unknown\n");
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}
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#else
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(void) time;
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printf("not supported\n");
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#endif
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}
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/*
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* Print the input string if the bit is set in the value
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*/
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void print_if_bit(const char *str, int bit, int val)
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{
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if (bit & val) {
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printf("\t%s\n", str);
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}
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}
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/*
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* Return pointer to hardcoded "enabled" or "disabled" depending on the input value
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*/
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const char *get_enabled_str(int is_en)
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{
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return (is_en) ? "enabled" : "disabled";
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}
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/*
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* Return pointer to hardcoded MFL string value depending on the MFL code at the input
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*/
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const char *get_mfl_str(int mfl_code)
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{
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switch (mfl_code) {
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case MBEDTLS_SSL_MAX_FRAG_LEN_NONE:
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return "none";
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case MBEDTLS_SSL_MAX_FRAG_LEN_512:
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return "512";
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case MBEDTLS_SSL_MAX_FRAG_LEN_1024:
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return "1024";
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case MBEDTLS_SSL_MAX_FRAG_LEN_2048:
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return "2048";
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case MBEDTLS_SSL_MAX_FRAG_LEN_4096:
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return "4096";
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default:
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return "error";
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}
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}
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/*
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* Read next base64 code from the 'b64_file'. The 'b64_file' must be opened
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* previously. After each call to this function, the internal file position
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* indicator of the global b64_file is advanced.
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*
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* Note - This function checks the size of the input buffer and if necessary,
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* increases it to the maximum MAX_BASE64_LEN
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*
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* /p b64 pointer to the pointer of the buffer for input data
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* /p max_len pointer to the current buffer capacity. It can be changed if
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* the buffer needs to be increased
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*
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* \retval number of bytes written in to the b64 buffer or 0 in case no more
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* data was found
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*/
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size_t read_next_b64_code(uint8_t **b64, size_t *max_len)
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{
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int valid_balance = 0; /* balance between valid and invalid characters */
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size_t len = 0;
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char pad = 0;
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int c = 0;
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while (EOF != c) {
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char c_valid = 0;
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c = fgetc(b64_file);
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if (pad > 0) {
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if (c == '=' && pad == 1) {
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c_valid = 1;
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pad = 2;
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}
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} else if ((c >= 'A' && c <= 'Z') ||
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(c >= 'a' && c <= 'z') ||
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(c >= '0' && c <= '9') ||
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c == '+' || c == '/') {
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c_valid = 1;
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} else if (c == '=') {
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c_valid = 1;
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pad = 1;
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} else if (c == '-') {
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c = '+';
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c_valid = 1;
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} else if (c == '_') {
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c = '/';
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c_valid = 1;
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}
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if (c_valid) {
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/* A string of characters that could be a base64 code. */
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valid_balance++;
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if (len < *max_len) {
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(*b64)[len++] = c;
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} else if (*max_len < MAX_BASE64_LEN) {
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/* Current buffer is too small, but can be resized. */
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void *ptr;
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size_t new_size = (MAX_BASE64_LEN - 4096 > *max_len) ?
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*max_len + 4096 : MAX_BASE64_LEN;
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ptr = realloc(*b64, new_size);
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if (NULL == ptr) {
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printf_err(alloc_err);
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return 0;
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}
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*b64 = ptr;
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*max_len = new_size;
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(*b64)[len++] = c;
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} else {
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/* Too much data so it will be treated as invalid */
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len++;
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}
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} else if (len > 0) {
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/* End of a string that could be a base64 code, but need to check
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* that the length of the characters is correct. */
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valid_balance--;
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if (len < MIN_CONTEXT_LEN) {
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printf_dbg("The code found is too small to be a SSL context.\n");
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len = pad = 0;
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} else if (len > *max_len) {
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printf_err("The code found is too large by %" MBEDTLS_PRINTF_SIZET " bytes.\n",
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len - *max_len);
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len = pad = 0;
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} else if (len % 4 != 0) {
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printf_err("The length of the base64 code found should be a multiple of 4.\n");
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len = pad = 0;
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} else {
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/* Base64 code with valid character length. */
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return len;
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}
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} else {
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valid_balance--;
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}
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/* Detection of potentially wrong file format like: binary, zip, ISO, etc. */
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if (valid_balance < -100) {
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printf_err("Too many bad symbols detected. File check aborted.\n");
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return 0;
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}
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}
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printf_dbg("End of file\n");
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return 0;
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}
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#if !defined(MBEDTLS_X509_REMOVE_INFO)
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/*
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* This function deserializes and prints to the stdout all obtained information
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* about the certificates from provided data.
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*
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* /p ssl pointer to serialized certificate
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* /p len number of bytes in the buffer
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*/
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void print_deserialized_ssl_cert(const uint8_t *ssl, uint32_t len)
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{
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enum { STRLEN = 4096 };
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mbedtls_x509_crt crt;
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int ret;
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char str[STRLEN];
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printf("\nCertificate:\n");
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mbedtls_x509_crt_init(&crt);
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ret = mbedtls_x509_crt_parse_der(&crt, ssl, len);
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if (0 != ret) {
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mbedtls_strerror(ret, str, STRLEN);
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printf_err("Invalid format of X.509 - %s\n", str);
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printf("Cannot deserialize:\n\t");
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print_hex(ssl, len, 25, "\t");
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} else {
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mbedtls_x509_crt *current = &crt;
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while (current != NULL) {
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ret = mbedtls_x509_crt_info(str, STRLEN, "\t", current);
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if (0 > ret) {
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mbedtls_strerror(ret, str, STRLEN);
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printf_err("Cannot write to the output - %s\n", str);
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} else {
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printf("%s", str);
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}
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current = current->next;
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if (current) {
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printf("\n");
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}
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}
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}
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mbedtls_x509_crt_free(&crt);
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}
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#endif /* !MBEDTLS_X509_REMOVE_INFO */
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/*
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* This function deserializes and prints to the stdout all obtained information
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* about the session from provided data. This function was built based on
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* mbedtls_ssl_session_load(). mbedtls_ssl_session_load() could not be used
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* due to dependencies on the mbedTLS configuration.
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*
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* The data structure in the buffer:
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* uint64 start_time;
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* uint8 ciphersuite[2]; // defined by the standard
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* uint8 compression; // 0 or 1
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* uint8 session_id_len; // at most 32
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* opaque session_id[32];
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* opaque master[48]; // fixed length in the standard
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* uint32 verify_result;
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* opaque peer_cert<0..2^24-1>; // length 0 means no peer cert
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* opaque ticket<0..2^24-1>; // length 0 means no ticket
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* uint32 ticket_lifetime;
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* uint8 mfl_code; // up to 255 according to standard
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* uint8 trunc_hmac; // 0 or 1
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* uint8 encrypt_then_mac; // 0 or 1
|
|
*
|
|
* /p ssl pointer to serialized session
|
|
* /p len number of bytes in the buffer
|
|
* /p session_cfg_flag session configuration flags
|
|
*/
|
|
void print_deserialized_ssl_session(const uint8_t *ssl, uint32_t len,
|
|
int session_cfg_flag)
|
|
{
|
|
const struct mbedtls_ssl_ciphersuite_t *ciphersuite_info;
|
|
int ciphersuite_id;
|
|
uint32_t cert_len, ticket_len;
|
|
uint32_t verify_result, ticket_lifetime;
|
|
const uint8_t *end = ssl + len;
|
|
|
|
printf("\nSession info:\n");
|
|
|
|
if (session_cfg_flag & SESSION_CONFIG_TIME_BIT) {
|
|
uint64_t start;
|
|
CHECK_SSL_END(8);
|
|
start = ((uint64_t) ssl[0] << 56) |
|
|
((uint64_t) ssl[1] << 48) |
|
|
((uint64_t) ssl[2] << 40) |
|
|
((uint64_t) ssl[3] << 32) |
|
|
((uint64_t) ssl[4] << 24) |
|
|
((uint64_t) ssl[5] << 16) |
|
|
((uint64_t) ssl[6] << 8) |
|
|
((uint64_t) ssl[7]);
|
|
ssl += 8;
|
|
printf("\tstart time : ");
|
|
print_time(&start);
|
|
}
|
|
|
|
CHECK_SSL_END(2);
|
|
ciphersuite_id = ((int) ssl[0] << 8) | (int) ssl[1];
|
|
printf_dbg("Ciphersuite ID: %d\n", ciphersuite_id);
|
|
ssl += 2;
|
|
|
|
ciphersuite_info = mbedtls_ssl_ciphersuite_from_id(ciphersuite_id);
|
|
if (ciphersuite_info == NULL) {
|
|
printf_err("Cannot find ciphersuite info\n");
|
|
} else {
|
|
const mbedtls_cipher_info_t *cipher_info;
|
|
#if defined(MBEDTLS_MD_C)
|
|
const mbedtls_md_info_t *md_info;
|
|
#endif
|
|
|
|
printf("\tciphersuite : %s\n", ciphersuite_info->name);
|
|
printf("\tcipher flags : 0x%02X\n", ciphersuite_info->flags);
|
|
|
|
cipher_info = mbedtls_cipher_info_from_type(ciphersuite_info->cipher);
|
|
if (cipher_info == NULL) {
|
|
printf_err("Cannot find cipher info\n");
|
|
} else {
|
|
printf("\tcipher : %s\n", cipher_info->name);
|
|
}
|
|
#if defined(MBEDTLS_MD_C)
|
|
md_info = mbedtls_md_info_from_type(ciphersuite_info->mac);
|
|
if (md_info == NULL) {
|
|
printf_err("Cannot find Message-Digest info\n");
|
|
} else {
|
|
printf("\tMessage-Digest : %s\n", mbedtls_md_get_name(md_info));
|
|
}
|
|
#endif /* MBEDTLS_MD_C */
|
|
}
|
|
|
|
CHECK_SSL_END(1);
|
|
printf("\tcompression : %s\n", get_enabled_str(*ssl++));
|
|
|
|
/* Note - Here we can get session ID length from serialized data, but we
|
|
* use hardcoded 32-bytes length. This approach was taken from
|
|
* 'mbedtls_ssl_session_load()'. */
|
|
CHECK_SSL_END(1 + 32);
|
|
printf_dbg("Session id length: %u\n", (uint32_t) *ssl++);
|
|
printf("\tsession ID : ");
|
|
print_hex(ssl, 32, 16, "\t ");
|
|
ssl += 32;
|
|
|
|
printf("\tmaster secret : ");
|
|
CHECK_SSL_END(48);
|
|
print_hex(ssl, 48, 16, "\t ");
|
|
ssl += 48;
|
|
|
|
CHECK_SSL_END(4);
|
|
verify_result = ((uint32_t) ssl[0] << 24) |
|
|
((uint32_t) ssl[1] << 16) |
|
|
((uint32_t) ssl[2] << 8) |
|
|
((uint32_t) ssl[3]);
|
|
ssl += 4;
|
|
printf("\tverify result : 0x%08X\n", verify_result);
|
|
|
|
if (SESSION_CONFIG_CRT_BIT & session_cfg_flag) {
|
|
if (conf_keep_peer_certificate) {
|
|
CHECK_SSL_END(3);
|
|
cert_len = ((uint32_t) ssl[0] << 16) |
|
|
((uint32_t) ssl[1] << 8) |
|
|
((uint32_t) ssl[2]);
|
|
ssl += 3;
|
|
printf_dbg("Certificate length: %u\n", cert_len);
|
|
|
|
if (cert_len > 0) {
|
|
CHECK_SSL_END(cert_len);
|
|
#if !defined(MBEDTLS_X509_REMOVE_INFO)
|
|
print_deserialized_ssl_cert(ssl, cert_len);
|
|
#endif
|
|
ssl += cert_len;
|
|
}
|
|
} else {
|
|
printf("\tPeer digest : ");
|
|
|
|
CHECK_SSL_END(1);
|
|
switch ((mbedtls_md_type_t) *ssl++) {
|
|
case MBEDTLS_MD_NONE:
|
|
printf("none\n");
|
|
break;
|
|
case MBEDTLS_MD_MD5:
|
|
printf("MD5\n");
|
|
break;
|
|
case MBEDTLS_MD_SHA1:
|
|
printf("SHA1\n");
|
|
break;
|
|
case MBEDTLS_MD_SHA224:
|
|
printf("SHA224\n");
|
|
break;
|
|
case MBEDTLS_MD_SHA256:
|
|
printf("SHA256\n");
|
|
break;
|
|
case MBEDTLS_MD_SHA384:
|
|
printf("SHA384\n");
|
|
break;
|
|
case MBEDTLS_MD_SHA512:
|
|
printf("SHA512\n");
|
|
break;
|
|
case MBEDTLS_MD_RIPEMD160:
|
|
printf("RIPEMD160\n");
|
|
break;
|
|
default:
|
|
printf("undefined or erroneous\n");
|
|
break;
|
|
}
|
|
|
|
CHECK_SSL_END(1);
|
|
cert_len = (uint32_t) *ssl++;
|
|
printf_dbg("Message-Digest length: %u\n", cert_len);
|
|
|
|
if (cert_len > 0) {
|
|
printf("\tPeer digest cert : ");
|
|
CHECK_SSL_END(cert_len);
|
|
print_hex(ssl, cert_len, 16, "\t ");
|
|
ssl += cert_len;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (SESSION_CONFIG_CLIENT_TICKET_BIT & session_cfg_flag) {
|
|
printf("\nTicket:\n");
|
|
|
|
CHECK_SSL_END(3);
|
|
ticket_len = ((uint32_t) ssl[0] << 16) |
|
|
((uint32_t) ssl[1] << 8) |
|
|
((uint32_t) ssl[2]);
|
|
ssl += 3;
|
|
printf_dbg("Ticket length: %u\n", ticket_len);
|
|
|
|
if (ticket_len > 0) {
|
|
printf("\t");
|
|
CHECK_SSL_END(ticket_len);
|
|
print_hex(ssl, ticket_len, 22, "\t");
|
|
ssl += ticket_len;
|
|
printf("\n");
|
|
}
|
|
|
|
CHECK_SSL_END(4);
|
|
ticket_lifetime = ((uint32_t) ssl[0] << 24) |
|
|
((uint32_t) ssl[1] << 16) |
|
|
((uint32_t) ssl[2] << 8) |
|
|
((uint32_t) ssl[3]);
|
|
ssl += 4;
|
|
printf("\tlifetime : %u sec.\n", ticket_lifetime);
|
|
}
|
|
|
|
if (ssl < end) {
|
|
printf("\nSession others:\n");
|
|
}
|
|
|
|
if (SESSION_CONFIG_MFL_BIT & session_cfg_flag) {
|
|
CHECK_SSL_END(1);
|
|
printf("\tMFL : %s\n", get_mfl_str(*ssl++));
|
|
}
|
|
|
|
if (SESSION_CONFIG_TRUNC_HMAC_BIT & session_cfg_flag) {
|
|
CHECK_SSL_END(1);
|
|
printf("\tnegotiate truncated HMAC : %s\n", get_enabled_str(*ssl++));
|
|
}
|
|
|
|
if (SESSION_CONFIG_ETM_BIT & session_cfg_flag) {
|
|
CHECK_SSL_END(1);
|
|
printf("\tEncrypt-then-MAC : %s\n", get_enabled_str(*ssl++));
|
|
}
|
|
|
|
if (0 != (end - ssl)) {
|
|
printf_err("%i bytes left to analyze from session\n", (int32_t) (end - ssl));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This function deserializes and prints to the stdout all obtained information
|
|
* about the context from provided data. This function was built based on
|
|
* mbedtls_ssl_context_load(). mbedtls_ssl_context_load() could not be used
|
|
* due to dependencies on the mbedTLS configuration and the configuration of
|
|
* the context when serialization was created.
|
|
*
|
|
* The data structure in the buffer:
|
|
* // header
|
|
* uint8 version[3];
|
|
* uint8 configuration[5];
|
|
* // session sub-structure
|
|
* uint32_t session_len;
|
|
* opaque session<1..2^32-1>; // see mbedtls_ssl_session_save()
|
|
* // transform sub-structure
|
|
* uint8 random[64]; // ServerHello.random+ClientHello.random
|
|
* uint8 in_cid_len;
|
|
* uint8 in_cid<0..2^8-1> // Connection ID: expected incoming value
|
|
* uint8 out_cid_len;
|
|
* uint8 out_cid<0..2^8-1> // Connection ID: outgoing value to use
|
|
* // fields from ssl_context
|
|
* uint32 badmac_seen; // DTLS: number of records with failing MAC
|
|
* uint64 in_window_top; // DTLS: last validated record seq_num
|
|
* uint64 in_window; // DTLS: bitmask for replay protection
|
|
* uint8 disable_datagram_packing; // DTLS: only one record per datagram
|
|
* uint64 cur_out_ctr; // Record layer: outgoing sequence number
|
|
* uint16 mtu; // DTLS: path mtu (max outgoing fragment size)
|
|
* uint8 alpn_chosen_len;
|
|
* uint8 alpn_chosen<0..2^8-1> // ALPN: negotiated application protocol
|
|
*
|
|
* /p ssl pointer to serialized session
|
|
* /p len number of bytes in the buffer
|
|
*/
|
|
void print_deserialized_ssl_context(const uint8_t *ssl, size_t len)
|
|
{
|
|
const uint8_t *end = ssl + len;
|
|
uint32_t session_len;
|
|
int session_cfg_flag;
|
|
int context_cfg_flag;
|
|
|
|
printf("\nMbed TLS version:\n");
|
|
|
|
CHECK_SSL_END(3 + 2 + 3);
|
|
|
|
printf("\tmajor %u\n", (uint32_t) *ssl++);
|
|
printf("\tminor %u\n", (uint32_t) *ssl++);
|
|
printf("\tpath %u\n", (uint32_t) *ssl++);
|
|
|
|
printf("\nEnabled session and context configuration:\n");
|
|
|
|
session_cfg_flag = ((int) ssl[0] << 8) | ((int) ssl[1]);
|
|
ssl += 2;
|
|
|
|
context_cfg_flag = ((int) ssl[0] << 16) |
|
|
((int) ssl[1] << 8) |
|
|
((int) ssl[2]);
|
|
ssl += 3;
|
|
|
|
printf_dbg("Session config flags 0x%04X\n", session_cfg_flag);
|
|
printf_dbg("Context config flags 0x%06X\n", context_cfg_flag);
|
|
|
|
print_if_bit("MBEDTLS_HAVE_TIME", SESSION_CONFIG_TIME_BIT, session_cfg_flag);
|
|
print_if_bit("MBEDTLS_X509_CRT_PARSE_C", SESSION_CONFIG_CRT_BIT, session_cfg_flag);
|
|
print_if_bit("MBEDTLS_SSL_MAX_FRAGMENT_LENGTH", SESSION_CONFIG_MFL_BIT, session_cfg_flag);
|
|
print_if_bit("MBEDTLS_SSL_ENCRYPT_THEN_MAC", SESSION_CONFIG_ETM_BIT, session_cfg_flag);
|
|
print_if_bit("MBEDTLS_SSL_SESSION_TICKETS", SESSION_CONFIG_TICKET_BIT, session_cfg_flag);
|
|
print_if_bit("MBEDTLS_SSL_SESSION_TICKETS and client",
|
|
SESSION_CONFIG_CLIENT_TICKET_BIT,
|
|
session_cfg_flag);
|
|
|
|
print_if_bit("MBEDTLS_SSL_DTLS_CONNECTION_ID",
|
|
CONTEXT_CONFIG_DTLS_CONNECTION_ID_BIT,
|
|
context_cfg_flag);
|
|
print_if_bit("MBEDTLS_SSL_DTLS_ANTI_REPLAY",
|
|
CONTEXT_CONFIG_DTLS_ANTI_REPLAY_BIT,
|
|
context_cfg_flag);
|
|
print_if_bit("MBEDTLS_SSL_ALPN", CONTEXT_CONFIG_ALPN_BIT, context_cfg_flag);
|
|
|
|
CHECK_SSL_END(4);
|
|
session_len = ((uint32_t) ssl[0] << 24) |
|
|
((uint32_t) ssl[1] << 16) |
|
|
((uint32_t) ssl[2] << 8) |
|
|
((uint32_t) ssl[3]);
|
|
ssl += 4;
|
|
printf_dbg("Session length %u\n", session_len);
|
|
|
|
CHECK_SSL_END(session_len);
|
|
print_deserialized_ssl_session(ssl, session_len, session_cfg_flag);
|
|
ssl += session_len;
|
|
|
|
printf("\nRandom bytes:\n\t");
|
|
|
|
CHECK_SSL_END(TRANSFORM_RANDBYTE_LEN);
|
|
print_hex(ssl, TRANSFORM_RANDBYTE_LEN, 22, "\t");
|
|
ssl += TRANSFORM_RANDBYTE_LEN;
|
|
|
|
printf("\nContext others:\n");
|
|
|
|
if (CONTEXT_CONFIG_DTLS_CONNECTION_ID_BIT & context_cfg_flag) {
|
|
uint8_t cid_len;
|
|
|
|
CHECK_SSL_END(1);
|
|
cid_len = *ssl++;
|
|
printf_dbg("In CID length %u\n", (uint32_t) cid_len);
|
|
|
|
printf("\tin CID : ");
|
|
if (cid_len > 0) {
|
|
CHECK_SSL_END(cid_len);
|
|
print_hex(ssl, cid_len, 20, "\t");
|
|
ssl += cid_len;
|
|
} else {
|
|
printf("none\n");
|
|
}
|
|
|
|
CHECK_SSL_END(1);
|
|
cid_len = *ssl++;
|
|
printf_dbg("Out CID length %u\n", (uint32_t) cid_len);
|
|
|
|
printf("\tout CID : ");
|
|
if (cid_len > 0) {
|
|
CHECK_SSL_END(cid_len);
|
|
print_hex(ssl, cid_len, 20, "\t");
|
|
ssl += cid_len;
|
|
} else {
|
|
printf("none\n");
|
|
}
|
|
}
|
|
|
|
if (CONTEXT_CONFIG_DTLS_BADMAC_LIMIT_BIT & context_cfg_flag) {
|
|
uint32_t badmac_seen;
|
|
|
|
CHECK_SSL_END(4);
|
|
badmac_seen = ((uint32_t) ssl[0] << 24) |
|
|
((uint32_t) ssl[1] << 16) |
|
|
((uint32_t) ssl[2] << 8) |
|
|
((uint32_t) ssl[3]);
|
|
ssl += 4;
|
|
printf("\tbad MAC seen number : %u\n", badmac_seen);
|
|
|
|
/* value 'in_window_top' from mbedtls_ssl_context */
|
|
printf("\tlast validated record sequence no. : ");
|
|
CHECK_SSL_END(8);
|
|
print_hex(ssl, 8, 20, "");
|
|
ssl += 8;
|
|
|
|
/* value 'in_window' from mbedtls_ssl_context */
|
|
printf("\tbitmask for replay detection : ");
|
|
CHECK_SSL_END(8);
|
|
print_hex(ssl, 8, 20, "");
|
|
ssl += 8;
|
|
}
|
|
|
|
if (conf_dtls_proto) {
|
|
CHECK_SSL_END(1);
|
|
printf("\tDTLS datagram packing : %s\n",
|
|
get_enabled_str(!(*ssl++)));
|
|
}
|
|
|
|
/* value 'cur_out_ctr' from mbedtls_ssl_context */
|
|
printf("\toutgoing record sequence no. : ");
|
|
CHECK_SSL_END(8);
|
|
print_hex(ssl, 8, 20, "");
|
|
ssl += 8;
|
|
|
|
if (conf_dtls_proto) {
|
|
uint16_t mtu;
|
|
CHECK_SSL_END(2);
|
|
mtu = (ssl[0] << 8) | ssl[1];
|
|
ssl += 2;
|
|
printf("\tMTU : %u\n", mtu);
|
|
}
|
|
|
|
|
|
if (CONTEXT_CONFIG_ALPN_BIT & context_cfg_flag) {
|
|
uint8_t alpn_len;
|
|
|
|
CHECK_SSL_END(1);
|
|
alpn_len = *ssl++;
|
|
printf_dbg("ALPN length %u\n", (uint32_t) alpn_len);
|
|
|
|
printf("\tALPN negotiation : ");
|
|
CHECK_SSL_END(alpn_len);
|
|
if (alpn_len > 0) {
|
|
if (strlen((const char *) ssl) == alpn_len) {
|
|
printf("%s\n", ssl);
|
|
} else {
|
|
printf("\n");
|
|
printf_err("\tALPN negotiation is incorrect\n");
|
|
}
|
|
ssl += alpn_len;
|
|
} else {
|
|
printf("not selected\n");
|
|
}
|
|
}
|
|
|
|
if (0 != (end - ssl)) {
|
|
printf_err("%i bytes left to analyze from context\n", (int32_t) (end - ssl));
|
|
}
|
|
printf("\n");
|
|
}
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
enum { SSL_INIT_LEN = 4096 };
|
|
|
|
uint32_t b64_counter = 0;
|
|
uint8_t *b64_buf = NULL;
|
|
uint8_t *ssl_buf = NULL;
|
|
size_t b64_max_len = SSL_INIT_LEN;
|
|
size_t ssl_max_len = SSL_INIT_LEN;
|
|
size_t ssl_len = 0;
|
|
|
|
#if defined(MBEDTLS_USE_PSA_CRYPTO)
|
|
psa_status_t status = psa_crypto_init();
|
|
if (status != PSA_SUCCESS) {
|
|
mbedtls_fprintf(stderr, "Failed to initialize PSA Crypto implementation: %d\n",
|
|
(int) status);
|
|
return MBEDTLS_ERR_SSL_HW_ACCEL_FAILED;
|
|
}
|
|
#endif /* MBEDTLS_USE_PSA_CRYPTO */
|
|
|
|
/* The 'b64_file' is opened when parsing arguments to check that the
|
|
* file name is correct */
|
|
parse_arguments(argc, argv);
|
|
|
|
if (NULL != b64_file) {
|
|
b64_buf = malloc(SSL_INIT_LEN);
|
|
ssl_buf = malloc(SSL_INIT_LEN);
|
|
|
|
if (NULL == b64_buf || NULL == ssl_buf) {
|
|
printf_err(alloc_err);
|
|
fclose(b64_file);
|
|
b64_file = NULL;
|
|
}
|
|
}
|
|
|
|
while (NULL != b64_file) {
|
|
size_t b64_len = read_next_b64_code(&b64_buf, &b64_max_len);
|
|
if (b64_len > 0) {
|
|
int ret;
|
|
size_t ssl_required_len = b64_len * 3 / 4 + 1;
|
|
|
|
/* Allocate more memory if necessary. */
|
|
if (ssl_required_len > ssl_max_len) {
|
|
void *ptr = realloc(ssl_buf, ssl_required_len);
|
|
if (NULL == ptr) {
|
|
printf_err(alloc_err);
|
|
fclose(b64_file);
|
|
b64_file = NULL;
|
|
break;
|
|
}
|
|
ssl_buf = ptr;
|
|
ssl_max_len = ssl_required_len;
|
|
}
|
|
|
|
printf("\nDeserializing number %u:\n", ++b64_counter);
|
|
|
|
printf("\nBase64 code:\n");
|
|
print_b64(b64_buf, b64_len);
|
|
|
|
ret = mbedtls_base64_decode(ssl_buf, ssl_max_len, &ssl_len, b64_buf, b64_len);
|
|
if (ret != 0) {
|
|
mbedtls_strerror(ret, (char *) b64_buf, b64_max_len);
|
|
printf_err("base64 code cannot be decoded - %s\n", b64_buf);
|
|
continue;
|
|
}
|
|
|
|
if (debug) {
|
|
printf("\nDecoded data in hex:\n\t");
|
|
print_hex(ssl_buf, ssl_len, 25, "\t");
|
|
}
|
|
|
|
print_deserialized_ssl_context(ssl_buf, ssl_len);
|
|
|
|
} else {
|
|
fclose(b64_file);
|
|
b64_file = NULL;
|
|
}
|
|
}
|
|
|
|
free(b64_buf);
|
|
free(ssl_buf);
|
|
|
|
if (b64_counter > 0) {
|
|
printf_dbg("Finished. Found %u base64 codes\n", b64_counter);
|
|
} else {
|
|
printf("Finished. No valid base64 code found\n");
|
|
}
|
|
|
|
#if defined(MBEDTLS_USE_PSA_CRYPTO)
|
|
mbedtls_psa_crypto_free();
|
|
#endif /* MBEDTLS_USE_PSA_CRYPTO */
|
|
|
|
return 0;
|
|
}
|
|
|
|
#endif /* MBEDTLS_X509_CRT_PARSE_C */
|