369 lines
13 KiB
C
369 lines
13 KiB
C
/*
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* Certificate request generation
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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_X509_CSR_WRITE_C) || !defined(MBEDTLS_FS_IO) || \
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!defined(MBEDTLS_PK_PARSE_C) || !defined(MBEDTLS_SHA256_C) || \
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!defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_CTR_DRBG_C) || \
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!defined(MBEDTLS_PEM_WRITE_C)
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int main(void)
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{
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mbedtls_printf("MBEDTLS_X509_CSR_WRITE_C and/or MBEDTLS_FS_IO and/or "
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"MBEDTLS_PK_PARSE_C and/or MBEDTLS_SHA256_C and/or "
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"MBEDTLS_ENTROPY_C and/or MBEDTLS_CTR_DRBG_C "
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"not defined.\n");
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mbedtls_exit(0);
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}
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#else
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#include "mbedtls/x509_csr.h"
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#include "mbedtls/entropy.h"
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#include "mbedtls/ctr_drbg.h"
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#include "mbedtls/error.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 DFL_FILENAME "keyfile.key"
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#define DFL_PASSWORD NULL
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#define DFL_DEBUG_LEVEL 0
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#define DFL_OUTPUT_FILENAME "cert.req"
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#define DFL_SUBJECT_NAME "CN=Cert,O=mbed TLS,C=UK"
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#define DFL_KEY_USAGE 0
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#define DFL_FORCE_KEY_USAGE 0
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#define DFL_NS_CERT_TYPE 0
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#define DFL_FORCE_NS_CERT_TYPE 0
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#define DFL_MD_ALG MBEDTLS_MD_SHA256
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#define USAGE \
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"\n usage: cert_req param=<>...\n" \
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"\n acceptable parameters:\n" \
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" filename=%%s default: keyfile.key\n" \
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" password=%%s default: NULL\n" \
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" debug_level=%%d default: 0 (disabled)\n" \
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" output_file=%%s default: cert.req\n" \
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" subject_name=%%s default: CN=Cert,O=mbed TLS,C=UK\n" \
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" key_usage=%%s default: (empty)\n" \
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" Comma-separated-list of values:\n" \
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" digital_signature\n" \
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" non_repudiation\n" \
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" key_encipherment\n" \
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" data_encipherment\n" \
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" key_agreement\n" \
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" key_cert_sign\n" \
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" crl_sign\n" \
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" force_key_usage=0/1 default: off\n" \
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" Add KeyUsage even if it is empty\n" \
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" ns_cert_type=%%s default: (empty)\n" \
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" Comma-separated-list of values:\n" \
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" ssl_client\n" \
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" ssl_server\n" \
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" email\n" \
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" object_signing\n" \
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" ssl_ca\n" \
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" email_ca\n" \
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" object_signing_ca\n" \
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" force_ns_cert_type=0/1 default: off\n" \
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" Add NsCertType even if it is empty\n" \
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" md=%%s default: SHA256\n" \
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" possible values:\n" \
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" MD5, RIPEMD160, SHA1,\n" \
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" SHA224, SHA256, SHA384, SHA512\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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const char *filename; /* filename of the key file */
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const char *password; /* password for the key file */
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int debug_level; /* level of debugging */
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const char *output_file; /* where to store the constructed key file */
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const char *subject_name; /* subject name for certificate request */
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unsigned char key_usage; /* key usage flags */
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int force_key_usage; /* Force adding the KeyUsage extension */
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unsigned char ns_cert_type; /* NS cert type */
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int force_ns_cert_type; /* Force adding NsCertType extension */
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mbedtls_md_type_t md_alg; /* Hash algorithm used for signature. */
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} opt;
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int write_certificate_request(mbedtls_x509write_csr *req, const char *output_file,
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int (*f_rng)(void *, unsigned char *, size_t),
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void *p_rng)
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{
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int ret;
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FILE *f;
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unsigned char output_buf[4096];
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size_t len = 0;
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memset(output_buf, 0, 4096);
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if ((ret = mbedtls_x509write_csr_pem(req, output_buf, 4096, f_rng, p_rng)) < 0) {
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return ret;
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}
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len = strlen((char *) output_buf);
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if ((f = fopen(output_file, "w")) == NULL) {
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return -1;
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}
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if (fwrite(output_buf, 1, len, f) != len) {
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fclose(f);
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return -1;
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}
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fclose(f);
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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_pk_context key;
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char buf[1024];
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int i;
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char *p, *q, *r;
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mbedtls_x509write_csr req;
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mbedtls_entropy_context entropy;
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mbedtls_ctr_drbg_context ctr_drbg;
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const char *pers = "csr example app";
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/*
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* Set to sane values
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*/
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mbedtls_x509write_csr_init(&req);
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mbedtls_pk_init(&key);
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mbedtls_ctr_drbg_init(&ctr_drbg);
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memset(buf, 0, sizeof(buf));
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if (argc == 0) {
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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.filename = DFL_FILENAME;
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opt.password = DFL_PASSWORD;
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opt.debug_level = DFL_DEBUG_LEVEL;
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opt.output_file = DFL_OUTPUT_FILENAME;
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opt.subject_name = DFL_SUBJECT_NAME;
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opt.key_usage = DFL_KEY_USAGE;
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opt.force_key_usage = DFL_FORCE_KEY_USAGE;
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opt.ns_cert_type = DFL_NS_CERT_TYPE;
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opt.force_ns_cert_type = DFL_FORCE_NS_CERT_TYPE;
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opt.md_alg = DFL_MD_ALG;
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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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if (strcmp(p, "filename") == 0) {
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opt.filename = q;
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} else if (strcmp(p, "password") == 0) {
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opt.password = q;
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} else if (strcmp(p, "output_file") == 0) {
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opt.output_file = 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, "subject_name") == 0) {
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opt.subject_name = q;
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} else if (strcmp(p, "md") == 0) {
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const mbedtls_md_info_t *md_info =
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mbedtls_md_info_from_string(q);
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if (md_info == NULL) {
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mbedtls_printf("Invalid argument for option %s\n", p);
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goto usage;
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}
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opt.md_alg = mbedtls_md_get_type(md_info);
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} else if (strcmp(p, "key_usage") == 0) {
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while (q != NULL) {
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if ((r = strchr(q, ',')) != NULL) {
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*r++ = '\0';
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}
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if (strcmp(q, "digital_signature") == 0) {
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opt.key_usage |= MBEDTLS_X509_KU_DIGITAL_SIGNATURE;
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} else if (strcmp(q, "non_repudiation") == 0) {
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opt.key_usage |= MBEDTLS_X509_KU_NON_REPUDIATION;
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} else if (strcmp(q, "key_encipherment") == 0) {
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opt.key_usage |= MBEDTLS_X509_KU_KEY_ENCIPHERMENT;
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} else if (strcmp(q, "data_encipherment") == 0) {
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opt.key_usage |= MBEDTLS_X509_KU_DATA_ENCIPHERMENT;
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} else if (strcmp(q, "key_agreement") == 0) {
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opt.key_usage |= MBEDTLS_X509_KU_KEY_AGREEMENT;
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} else if (strcmp(q, "key_cert_sign") == 0) {
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opt.key_usage |= MBEDTLS_X509_KU_KEY_CERT_SIGN;
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} else if (strcmp(q, "crl_sign") == 0) {
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opt.key_usage |= MBEDTLS_X509_KU_CRL_SIGN;
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} else {
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goto usage;
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}
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q = r;
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}
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} else if (strcmp(p, "force_key_usage") == 0) {
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switch (atoi(q)) {
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case 0: opt.force_key_usage = 0; break;
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case 1: opt.force_key_usage = 1; break;
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default: goto usage;
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}
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} else if (strcmp(p, "ns_cert_type") == 0) {
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while (q != NULL) {
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if ((r = strchr(q, ',')) != NULL) {
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*r++ = '\0';
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}
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if (strcmp(q, "ssl_client") == 0) {
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opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_SSL_CLIENT;
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} else if (strcmp(q, "ssl_server") == 0) {
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opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_SSL_SERVER;
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} else if (strcmp(q, "email") == 0) {
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opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_EMAIL;
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} else if (strcmp(q, "object_signing") == 0) {
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opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING;
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} else if (strcmp(q, "ssl_ca") == 0) {
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opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_SSL_CA;
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} else if (strcmp(q, "email_ca") == 0) {
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opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_EMAIL_CA;
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} else if (strcmp(q, "object_signing_ca") == 0) {
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opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING_CA;
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} else {
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goto usage;
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}
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q = r;
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}
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} else if (strcmp(p, "force_ns_cert_type") == 0) {
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switch (atoi(q)) {
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case 0: opt.force_ns_cert_type = 0; break;
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case 1: opt.force_ns_cert_type = 1; break;
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default: 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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mbedtls_x509write_csr_set_md_alg(&req, opt.md_alg);
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if (opt.key_usage || opt.force_key_usage == 1) {
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mbedtls_x509write_csr_set_key_usage(&req, opt.key_usage);
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}
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if (opt.ns_cert_type || opt.force_ns_cert_type == 1) {
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mbedtls_x509write_csr_set_ns_cert_type(&req, opt.ns_cert_type);
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}
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/*
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* 0. Seed the PRNG
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*/
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mbedtls_printf(" . 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", ret);
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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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* 1.0. Check the subject name for validity
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*/
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mbedtls_printf(" . Checking subject name...");
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fflush(stdout);
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if ((ret = mbedtls_x509write_csr_set_subject_name(&req, opt.subject_name)) != 0) {
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mbedtls_printf(" failed\n ! mbedtls_x509write_csr_set_subject_name returned %d", ret);
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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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* 1.1. Load the key
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*/
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mbedtls_printf(" . Loading the private key ...");
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fflush(stdout);
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ret = mbedtls_pk_parse_keyfile(&key, opt.filename, opt.password,
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mbedtls_ctr_drbg_random, &ctr_drbg);
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if (ret != 0) {
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mbedtls_printf(" failed\n ! mbedtls_pk_parse_keyfile returned %d", ret);
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goto exit;
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}
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mbedtls_x509write_csr_set_key(&req, &key);
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mbedtls_printf(" ok\n");
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/*
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* 1.2. Writing the request
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*/
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mbedtls_printf(" . Writing the certificate request ...");
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fflush(stdout);
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if ((ret = write_certificate_request(&req, opt.output_file,
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mbedtls_ctr_drbg_random, &ctr_drbg)) != 0) {
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mbedtls_printf(" failed\n ! write_certificate_request %d", ret);
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goto exit;
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}
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mbedtls_printf(" ok\n");
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exit_code = MBEDTLS_EXIT_SUCCESS;
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exit:
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if (exit_code != MBEDTLS_EXIT_SUCCESS) {
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#ifdef MBEDTLS_ERROR_C
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mbedtls_strerror(ret, buf, sizeof(buf));
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mbedtls_printf(" - %s\n", buf);
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#else
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mbedtls_printf("\n");
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#endif
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}
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mbedtls_x509write_csr_free(&req);
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mbedtls_pk_free(&key);
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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_X509_CSR_WRITE_C && MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO &&
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MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_C && MBEDTLS_PEM_WRITE_C */
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