456 lines
15 KiB
C
456 lines
15 KiB
C
/*
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* Certificate reading application
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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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#include "mbedtls/build_info.h"
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#include "mbedtls/platform.h"
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#if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) || \
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!defined(MBEDTLS_SSL_TLS_C) || !defined(MBEDTLS_SSL_CLI_C) || \
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!defined(MBEDTLS_NET_C) || !defined(MBEDTLS_RSA_C) || \
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!defined(MBEDTLS_X509_CRT_PARSE_C) || !defined(MBEDTLS_FS_IO) || \
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!defined(MBEDTLS_CTR_DRBG_C) || defined(MBEDTLS_X509_REMOVE_INFO)
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int main(void)
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{
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mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_ENTROPY_C and/or "
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"MBEDTLS_SSL_TLS_C and/or MBEDTLS_SSL_CLI_C and/or "
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"MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or "
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"MBEDTLS_X509_CRT_PARSE_C and/or MBEDTLS_FS_IO and/or "
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"MBEDTLS_CTR_DRBG_C not defined and/or MBEDTLS_X509_REMOVE_INFO defined.\n");
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mbedtls_exit(0);
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}
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#else
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#include "mbedtls/entropy.h"
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#include "mbedtls/ctr_drbg.h"
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#include "mbedtls/net_sockets.h"
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#include "mbedtls/ssl.h"
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#include "mbedtls/x509.h"
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#include "mbedtls/debug.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define MODE_NONE 0
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#define MODE_FILE 1
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#define MODE_SSL 2
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#define DFL_MODE MODE_NONE
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#define DFL_FILENAME "cert.crt"
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#define DFL_CA_FILE ""
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#define DFL_CRL_FILE ""
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#define DFL_CA_PATH ""
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#define DFL_SERVER_NAME "localhost"
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#define DFL_SERVER_PORT "4433"
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#define DFL_DEBUG_LEVEL 0
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#define DFL_PERMISSIVE 0
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#define USAGE_IO \
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" ca_file=%%s The single file containing the top-level CA(s) you fully trust\n" \
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" default: \"\" (none)\n" \
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" crl_file=%%s The single CRL file you want to use\n" \
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" default: \"\" (none)\n" \
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" ca_path=%%s The path containing the top-level CA(s) you fully trust\n" \
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" default: \"\" (none) (overrides ca_file)\n"
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#define USAGE \
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"\n usage: cert_app param=<>...\n" \
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"\n acceptable parameters:\n" \
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" mode=file|ssl default: none\n" \
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" filename=%%s default: cert.crt\n" \
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USAGE_IO \
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" server_name=%%s default: localhost\n" \
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" server_port=%%d default: 4433\n" \
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" debug_level=%%d default: 0 (disabled)\n" \
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" permissive=%%d default: 0 (disabled)\n" \
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"\n"
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/*
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* global options
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*/
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struct options {
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int mode; /* the mode to run the application in */
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const char *filename; /* filename of the certificate file */
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const char *ca_file; /* the file with the CA certificate(s) */
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const char *crl_file; /* the file with the CRL to use */
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const char *ca_path; /* the path with the CA certificate(s) reside */
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const char *server_name; /* hostname of the server (client only) */
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const char *server_port; /* port on which the ssl service runs */
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int debug_level; /* level of debugging */
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int permissive; /* permissive parsing */
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} opt;
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static void my_debug(void *ctx, int level,
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const char *file, int line,
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const char *str)
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{
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((void) level);
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mbedtls_fprintf((FILE *) ctx, "%s:%04d: %s", file, line, str);
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fflush((FILE *) ctx);
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}
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static int my_verify(void *data, mbedtls_x509_crt *crt, int depth, uint32_t *flags)
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{
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char buf[1024];
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((void) data);
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mbedtls_printf("\nVerify requested for (Depth %d):\n", depth);
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mbedtls_x509_crt_info(buf, sizeof(buf) - 1, "", crt);
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mbedtls_printf("%s", buf);
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if ((*flags) == 0) {
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mbedtls_printf(" This certificate has no flags\n");
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} else {
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mbedtls_x509_crt_verify_info(buf, sizeof(buf), " ! ", *flags);
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mbedtls_printf("%s\n", buf);
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}
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return 0;
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}
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int main(int argc, char *argv[])
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{
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int ret = 1;
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int exit_code = MBEDTLS_EXIT_FAILURE;
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mbedtls_net_context server_fd;
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unsigned char buf[1024];
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mbedtls_entropy_context entropy;
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mbedtls_ctr_drbg_context ctr_drbg;
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mbedtls_ssl_context ssl;
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mbedtls_ssl_config conf;
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mbedtls_x509_crt cacert;
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mbedtls_x509_crl cacrl;
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int i, j;
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uint32_t flags;
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int verify = 0;
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char *p, *q;
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const char *pers = "cert_app";
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/*
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* Set to sane values
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*/
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mbedtls_net_init(&server_fd);
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mbedtls_ctr_drbg_init(&ctr_drbg);
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mbedtls_ssl_init(&ssl);
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mbedtls_ssl_config_init(&conf);
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mbedtls_x509_crt_init(&cacert);
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#if defined(MBEDTLS_X509_CRL_PARSE_C)
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mbedtls_x509_crl_init(&cacrl);
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#else
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/* Zeroize structure as CRL parsing is not supported and we have to pass
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it to the verify function */
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memset(&cacrl, 0, sizeof(mbedtls_x509_crl));
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#endif
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if (argc < 2) {
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usage:
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mbedtls_printf(USAGE);
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goto exit;
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}
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opt.mode = DFL_MODE;
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opt.filename = DFL_FILENAME;
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opt.ca_file = DFL_CA_FILE;
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opt.crl_file = DFL_CRL_FILE;
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opt.ca_path = DFL_CA_PATH;
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opt.server_name = DFL_SERVER_NAME;
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opt.server_port = DFL_SERVER_PORT;
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opt.debug_level = DFL_DEBUG_LEVEL;
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opt.permissive = DFL_PERMISSIVE;
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for (i = 1; i < argc; i++) {
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p = argv[i];
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if ((q = strchr(p, '=')) == NULL) {
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goto usage;
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}
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*q++ = '\0';
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for (j = 0; p + j < q; j++) {
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if (argv[i][j] >= 'A' && argv[i][j] <= 'Z') {
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argv[i][j] |= 0x20;
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}
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}
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if (strcmp(p, "mode") == 0) {
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if (strcmp(q, "file") == 0) {
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opt.mode = MODE_FILE;
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} else if (strcmp(q, "ssl") == 0) {
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opt.mode = MODE_SSL;
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} else {
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goto usage;
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}
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} else if (strcmp(p, "filename") == 0) {
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opt.filename = q;
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} else if (strcmp(p, "ca_file") == 0) {
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opt.ca_file = q;
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} else if (strcmp(p, "crl_file") == 0) {
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opt.crl_file = q;
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} else if (strcmp(p, "ca_path") == 0) {
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opt.ca_path = q;
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} else if (strcmp(p, "server_name") == 0) {
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opt.server_name = q;
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} else if (strcmp(p, "server_port") == 0) {
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opt.server_port = q;
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} else if (strcmp(p, "debug_level") == 0) {
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opt.debug_level = atoi(q);
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if (opt.debug_level < 0 || opt.debug_level > 65535) {
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goto usage;
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}
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} else if (strcmp(p, "permissive") == 0) {
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opt.permissive = atoi(q);
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if (opt.permissive < 0 || opt.permissive > 1) {
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goto usage;
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}
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} else {
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goto usage;
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}
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}
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/*
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* 1.1. Load the trusted CA
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*/
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mbedtls_printf(" . Loading the CA root certificate ...");
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fflush(stdout);
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if (strlen(opt.ca_path)) {
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if ((ret = mbedtls_x509_crt_parse_path(&cacert, opt.ca_path)) < 0) {
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mbedtls_printf(" failed\n ! mbedtls_x509_crt_parse_path returned -0x%x\n\n",
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(unsigned int) -ret);
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goto exit;
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}
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verify = 1;
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} else if (strlen(opt.ca_file)) {
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if ((ret = mbedtls_x509_crt_parse_file(&cacert, opt.ca_file)) < 0) {
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mbedtls_printf(" failed\n ! mbedtls_x509_crt_parse_file returned -0x%x\n\n",
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(unsigned int) -ret);
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goto exit;
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}
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verify = 1;
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}
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mbedtls_printf(" ok (%d skipped)\n", ret);
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#if defined(MBEDTLS_X509_CRL_PARSE_C)
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if (strlen(opt.crl_file)) {
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if ((ret = mbedtls_x509_crl_parse_file(&cacrl, opt.crl_file)) != 0) {
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mbedtls_printf(" failed\n ! mbedtls_x509_crl_parse returned -0x%x\n\n",
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(unsigned int) -ret);
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goto exit;
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}
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verify = 1;
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}
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#endif
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if (opt.mode == MODE_FILE) {
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mbedtls_x509_crt crt;
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mbedtls_x509_crt *cur = &crt;
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mbedtls_x509_crt_init(&crt);
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/*
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* 1.1. Load the certificate(s)
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*/
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mbedtls_printf("\n . Loading the certificate(s) ...");
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fflush(stdout);
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ret = mbedtls_x509_crt_parse_file(&crt, opt.filename);
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if (ret < 0) {
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mbedtls_printf(" failed\n ! mbedtls_x509_crt_parse_file returned %d\n\n", ret);
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mbedtls_x509_crt_free(&crt);
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goto exit;
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}
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if (opt.permissive == 0 && ret > 0) {
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mbedtls_printf(
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" failed\n ! mbedtls_x509_crt_parse failed to parse %d certificates\n\n",
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ret);
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mbedtls_x509_crt_free(&crt);
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goto exit;
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}
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mbedtls_printf(" ok\n");
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/*
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* 1.2 Print the certificate(s)
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*/
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while (cur != NULL) {
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mbedtls_printf(" . Peer certificate information ...\n");
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ret = mbedtls_x509_crt_info((char *) buf, sizeof(buf) - 1, " ",
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cur);
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if (ret == -1) {
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mbedtls_printf(" failed\n ! mbedtls_x509_crt_info returned %d\n\n", ret);
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mbedtls_x509_crt_free(&crt);
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goto exit;
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}
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mbedtls_printf("%s\n", buf);
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cur = cur->next;
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}
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/*
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* 1.3 Verify the certificate
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*/
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if (verify) {
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mbedtls_printf(" . Verifying X.509 certificate...");
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if ((ret = mbedtls_x509_crt_verify(&crt, &cacert, &cacrl, NULL, &flags,
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my_verify, NULL)) != 0) {
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char vrfy_buf[512];
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mbedtls_printf(" failed\n");
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mbedtls_x509_crt_verify_info(vrfy_buf, sizeof(vrfy_buf), " ! ", flags);
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mbedtls_printf("%s\n", vrfy_buf);
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} else {
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mbedtls_printf(" ok\n");
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}
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}
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mbedtls_x509_crt_free(&crt);
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} else if (opt.mode == MODE_SSL) {
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/*
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* 1. Initialize the RNG and the session data
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*/
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mbedtls_printf("\n . Seeding the random number generator...");
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fflush(stdout);
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mbedtls_entropy_init(&entropy);
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if ((ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy,
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(const unsigned char *) pers,
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strlen(pers))) != 0) {
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mbedtls_printf(" failed\n ! mbedtls_ctr_drbg_seed returned %d\n", ret);
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goto ssl_exit;
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}
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mbedtls_printf(" ok\n");
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#if defined(MBEDTLS_DEBUG_C)
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mbedtls_debug_set_threshold(opt.debug_level);
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#endif
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/*
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* 2. Start the connection
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*/
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mbedtls_printf(" . SSL connection to tcp/%s/%s...", opt.server_name,
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opt.server_port);
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fflush(stdout);
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if ((ret = mbedtls_net_connect(&server_fd, opt.server_name,
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opt.server_port, MBEDTLS_NET_PROTO_TCP)) != 0) {
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mbedtls_printf(" failed\n ! mbedtls_net_connect returned %d\n\n", ret);
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goto ssl_exit;
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}
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/*
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* 3. Setup stuff
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*/
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if ((ret = mbedtls_ssl_config_defaults(&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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mbedtls_printf(" failed\n ! mbedtls_ssl_config_defaults returned %d\n\n", ret);
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goto exit;
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}
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if (verify) {
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mbedtls_ssl_conf_authmode(&conf, MBEDTLS_SSL_VERIFY_REQUIRED);
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mbedtls_ssl_conf_ca_chain(&conf, &cacert, NULL);
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mbedtls_ssl_conf_verify(&conf, my_verify, NULL);
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} else {
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mbedtls_ssl_conf_authmode(&conf, MBEDTLS_SSL_VERIFY_NONE);
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}
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mbedtls_ssl_conf_rng(&conf, mbedtls_ctr_drbg_random, &ctr_drbg);
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mbedtls_ssl_conf_dbg(&conf, my_debug, stdout);
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if ((ret = mbedtls_ssl_setup(&ssl, &conf)) != 0) {
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mbedtls_printf(" failed\n ! mbedtls_ssl_setup returned %d\n\n", ret);
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goto ssl_exit;
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}
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if ((ret = mbedtls_ssl_set_hostname(&ssl, opt.server_name)) != 0) {
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mbedtls_printf(" failed\n ! mbedtls_ssl_set_hostname returned %d\n\n", ret);
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goto ssl_exit;
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}
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mbedtls_ssl_set_bio(&ssl, &server_fd, mbedtls_net_send, mbedtls_net_recv, NULL);
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/*
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* 4. Handshake
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*/
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while ((ret = mbedtls_ssl_handshake(&ssl)) != 0) {
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if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
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mbedtls_printf(" failed\n ! mbedtls_ssl_handshake returned %d\n\n", ret);
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goto ssl_exit;
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}
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}
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mbedtls_printf(" ok\n");
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/*
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* 5. Print the certificate
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*/
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#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
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mbedtls_printf(" . Peer certificate information ... skipped\n");
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#else
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mbedtls_printf(" . Peer certificate information ...\n");
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ret = mbedtls_x509_crt_info((char *) buf, sizeof(buf) - 1, " ",
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mbedtls_ssl_get_peer_cert(&ssl));
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if (ret == -1) {
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mbedtls_printf(" failed\n ! mbedtls_x509_crt_info returned %d\n\n", ret);
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goto ssl_exit;
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}
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mbedtls_printf("%s\n", buf);
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#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
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mbedtls_ssl_close_notify(&ssl);
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ssl_exit:
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mbedtls_ssl_free(&ssl);
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mbedtls_ssl_config_free(&conf);
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} else {
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goto usage;
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}
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exit_code = MBEDTLS_EXIT_SUCCESS;
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exit:
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mbedtls_net_free(&server_fd);
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mbedtls_x509_crt_free(&cacert);
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#if defined(MBEDTLS_X509_CRL_PARSE_C)
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mbedtls_x509_crl_free(&cacrl);
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#endif
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mbedtls_ctr_drbg_free(&ctr_drbg);
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mbedtls_entropy_free(&entropy);
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mbedtls_exit(exit_code);
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}
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#endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C && MBEDTLS_SSL_TLS_C &&
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MBEDTLS_SSL_CLI_C && MBEDTLS_NET_C && MBEDTLS_RSA_C &&
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MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_FS_IO && MBEDTLS_CTR_DRBG_C */
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