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mbedtls/programs/x509/cert_req.c
Gilles Peskine 384e274670 cert_req: discover hash algorithms automatically 
Discover hash algorithms automatically rather than hard-coding a list,
as was previously done in cert_write.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
2020-08-21 20:43:32 +02:00

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/*
* Certificate request generation
*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#if !defined(MBEDTLS_CONFIG_FILE)
#include "mbedtls/config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif
#if defined(MBEDTLS_PLATFORM_C)
#include "mbedtls/platform.h"
#else
#include <stdio.h>
#include <stdlib.h>
#define mbedtls_printf printf
#define mbedtls_exit exit
#define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
#define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
#endif /* MBEDTLS_PLATFORM_C */
#if !defined(MBEDTLS_X509_CSR_WRITE_C) || !defined(MBEDTLS_FS_IO) || \
!defined(MBEDTLS_PK_PARSE_C) || !defined(MBEDTLS_SHA256_C) || \
!defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_CTR_DRBG_C) || \
!defined(MBEDTLS_PEM_WRITE_C)
int main( void )
{
mbedtls_printf( "MBEDTLS_X509_CSR_WRITE_C and/or MBEDTLS_FS_IO and/or "
"MBEDTLS_PK_PARSE_C and/or MBEDTLS_SHA256_C and/or "
"MBEDTLS_ENTROPY_C and/or MBEDTLS_CTR_DRBG_C "
"not defined.\n");
mbedtls_exit( 0 );
}
#else
#include "mbedtls/x509_csr.h"
#include "mbedtls/entropy.h"
#include "mbedtls/ctr_drbg.h"
#include "mbedtls/error.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define DFL_FILENAME "keyfile.key"
#define DFL_PASSWORD NULL
#define DFL_DEBUG_LEVEL 0
#define DFL_OUTPUT_FILENAME "cert.req"
#define DFL_SUBJECT_NAME "CN=Cert,O=mbed TLS,C=UK"
#define DFL_KEY_USAGE 0
#define DFL_FORCE_KEY_USAGE 0
#define DFL_NS_CERT_TYPE 0
#define DFL_FORCE_NS_CERT_TYPE 0
#define DFL_MD_ALG MBEDTLS_MD_SHA256
#define USAGE \
"\n usage: cert_req param=<>...\n" \
"\n acceptable parameters:\n" \
" filename=%%s default: keyfile.key\n" \
" password=%%s default: NULL\n" \
" debug_level=%%d default: 0 (disabled)\n" \
" output_file=%%s default: cert.req\n" \
" subject_name=%%s default: CN=Cert,O=mbed TLS,C=UK\n" \
" key_usage=%%s default: (empty)\n" \
" Comma-separated-list of values:\n" \
" digital_signature\n" \
" non_repudiation\n" \
" key_encipherment\n" \
" data_encipherment\n" \
" key_agreement\n" \
" key_cert_sign\n" \
" crl_sign\n" \
" force_key_usage=0/1 default: off\n" \
" Add KeyUsage even if it is empty\n" \
" ns_cert_type=%%s default: (empty)\n" \
" Comma-separated-list of values:\n" \
" ssl_client\n" \
" ssl_server\n" \
" email\n" \
" object_signing\n" \
" ssl_ca\n" \
" email_ca\n" \
" object_signing_ca\n" \
" force_ns_cert_type=0/1 default: off\n" \
" Add NsCertType even if it is empty\n" \
" md=%%s default: SHA256\n" \
" possible values:\n" \
" MD2, MD4, MD5, RIPEMD160, SHA1,\n" \
" SHA224, SHA256, SHA384, SHA512\n" \
"\n"
/*
* global options
*/
struct options
{
const char *filename; /* filename of the key file */
const char *password; /* password for the key file */
int debug_level; /* level of debugging */
const char *output_file; /* where to store the constructed key file */
const char *subject_name; /* subject name for certificate request */
unsigned char key_usage; /* key usage flags */
int force_key_usage; /* Force adding the KeyUsage extension */
unsigned char ns_cert_type; /* NS cert type */
int force_ns_cert_type; /* Force adding NsCertType extension */
mbedtls_md_type_t md_alg; /* Hash algorithm used for signature. */
} opt;
int write_certificate_request( mbedtls_x509write_csr *req, const char *output_file,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng )
{
int ret;
FILE *f;
unsigned char output_buf[4096];
size_t len = 0;
memset( output_buf, 0, 4096 );
if( ( ret = mbedtls_x509write_csr_pem( req, output_buf, 4096, f_rng, p_rng ) ) < 0 )
return( ret );
len = strlen( (char *) output_buf );
if( ( f = fopen( output_file, "w" ) ) == NULL )
return( -1 );
if( fwrite( output_buf, 1, len, f ) != len )
{
fclose( f );
return( -1 );
}
fclose( f );
return( 0 );
}
int main( int argc, char *argv[] )
{
int ret = 1;
int exit_code = MBEDTLS_EXIT_FAILURE;
mbedtls_pk_context key;
char buf[1024];
int i;
char *p, *q, *r;
mbedtls_x509write_csr req;
mbedtls_entropy_context entropy;
mbedtls_ctr_drbg_context ctr_drbg;
const char *pers = "csr example app";
/*
* Set to sane values
*/
mbedtls_x509write_csr_init( &req );
mbedtls_pk_init( &key );
mbedtls_ctr_drbg_init( &ctr_drbg );
memset( buf, 0, sizeof( buf ) );
if( argc == 0 )
{
usage:
mbedtls_printf( USAGE );
goto exit;
}
opt.filename = DFL_FILENAME;
opt.password = DFL_PASSWORD;
opt.debug_level = DFL_DEBUG_LEVEL;
opt.output_file = DFL_OUTPUT_FILENAME;
opt.subject_name = DFL_SUBJECT_NAME;
opt.key_usage = DFL_KEY_USAGE;
opt.force_key_usage = DFL_FORCE_KEY_USAGE;
opt.ns_cert_type = DFL_NS_CERT_TYPE;
opt.force_ns_cert_type = DFL_FORCE_NS_CERT_TYPE;
opt.md_alg = DFL_MD_ALG;
for( i = 1; i < argc; i++ )
{
p = argv[i];
if( ( q = strchr( p, '=' ) ) == NULL )
goto usage;
*q++ = '\0';
if( strcmp( p, "filename" ) == 0 )
opt.filename = q;
else if( strcmp( p, "password" ) == 0 )
opt.password = q;
else if( strcmp( p, "output_file" ) == 0 )
opt.output_file = q;
else if( strcmp( p, "debug_level" ) == 0 )
{
opt.debug_level = atoi( q );
if( opt.debug_level < 0 || opt.debug_level > 65535 )
goto usage;
}
else if( strcmp( p, "subject_name" ) == 0 )
{
opt.subject_name = q;
}
else if( strcmp( p, "md" ) == 0 )
{
const mbedtls_md_info_t *md_info =
mbedtls_md_info_from_string( q );
if( md_info == NULL )
{
mbedtls_printf( "Invalid argument for option %s\n", p );
goto usage;
}
opt.md_alg = mbedtls_md_get_type( md_info );
}
else if( strcmp( p, "key_usage" ) == 0 )
{
while( q != NULL )
{
if( ( r = strchr( q, ',' ) ) != NULL )
*r++ = '\0';
if( strcmp( q, "digital_signature" ) == 0 )
opt.key_usage |= MBEDTLS_X509_KU_DIGITAL_SIGNATURE;
else if( strcmp( q, "non_repudiation" ) == 0 )
opt.key_usage |= MBEDTLS_X509_KU_NON_REPUDIATION;
else if( strcmp( q, "key_encipherment" ) == 0 )
opt.key_usage |= MBEDTLS_X509_KU_KEY_ENCIPHERMENT;
else if( strcmp( q, "data_encipherment" ) == 0 )
opt.key_usage |= MBEDTLS_X509_KU_DATA_ENCIPHERMENT;
else if( strcmp( q, "key_agreement" ) == 0 )
opt.key_usage |= MBEDTLS_X509_KU_KEY_AGREEMENT;
else if( strcmp( q, "key_cert_sign" ) == 0 )
opt.key_usage |= MBEDTLS_X509_KU_KEY_CERT_SIGN;
else if( strcmp( q, "crl_sign" ) == 0 )
opt.key_usage |= MBEDTLS_X509_KU_CRL_SIGN;
else
goto usage;
q = r;
}
}
else if( strcmp( p, "force_key_usage" ) == 0 )
{
switch( atoi( q ) )
{
case 0: opt.force_key_usage = 0; break;
case 1: opt.force_key_usage = 1; break;
default: goto usage;
}
}
else if( strcmp( p, "ns_cert_type" ) == 0 )
{
while( q != NULL )
{
if( ( r = strchr( q, ',' ) ) != NULL )
*r++ = '\0';
if( strcmp( q, "ssl_client" ) == 0 )
opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_SSL_CLIENT;
else if( strcmp( q, "ssl_server" ) == 0 )
opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_SSL_SERVER;
else if( strcmp( q, "email" ) == 0 )
opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_EMAIL;
else if( strcmp( q, "object_signing" ) == 0 )
opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING;
else if( strcmp( q, "ssl_ca" ) == 0 )
opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_SSL_CA;
else if( strcmp( q, "email_ca" ) == 0 )
opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_EMAIL_CA;
else if( strcmp( q, "object_signing_ca" ) == 0 )
opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING_CA;
else
goto usage;
q = r;
}
}
else if( strcmp( p, "force_ns_cert_type" ) == 0 )
{
switch( atoi( q ) )
{
case 0: opt.force_ns_cert_type = 0; break;
case 1: opt.force_ns_cert_type = 1; break;
default: goto usage;
}
}
else
goto usage;
}
mbedtls_x509write_csr_set_md_alg( &req, opt.md_alg );
if( opt.key_usage || opt.force_key_usage == 1 )
mbedtls_x509write_csr_set_key_usage( &req, opt.key_usage );
if( opt.ns_cert_type || opt.force_ns_cert_type == 1 )
mbedtls_x509write_csr_set_ns_cert_type( &req, opt.ns_cert_type );
/*
* 0. Seed the PRNG
*/
mbedtls_printf( " . Seeding the random number generator..." );
fflush( stdout );
mbedtls_entropy_init( &entropy );
if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
(const unsigned char *) pers,
strlen( pers ) ) ) != 0 )
{
mbedtls_printf( " failed\n ! mbedtls_ctr_drbg_seed returned %d", ret );
goto exit;
}
mbedtls_printf( " ok\n" );
/*
* 1.0. Check the subject name for validity
*/
mbedtls_printf( " . Checking subject name..." );
fflush( stdout );
if( ( ret = mbedtls_x509write_csr_set_subject_name( &req, opt.subject_name ) ) != 0 )
{
mbedtls_printf( " failed\n ! mbedtls_x509write_csr_set_subject_name returned %d", ret );
goto exit;
}
mbedtls_printf( " ok\n" );
/*
* 1.1. Load the key
*/
mbedtls_printf( " . Loading the private key ..." );
fflush( stdout );
ret = mbedtls_pk_parse_keyfile( &key, opt.filename, opt.password );
if( ret != 0 )
{
mbedtls_printf( " failed\n ! mbedtls_pk_parse_keyfile returned %d", ret );
goto exit;
}
mbedtls_x509write_csr_set_key( &req, &key );
mbedtls_printf( " ok\n" );
/*
* 1.2. Writing the request
*/
mbedtls_printf( " . Writing the certificate request ..." );
fflush( stdout );
if( ( ret = write_certificate_request( &req, opt.output_file,
mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
{
mbedtls_printf( " failed\n ! write_certifcate_request %d", ret );
goto exit;
}
mbedtls_printf( " ok\n" );
exit_code = MBEDTLS_EXIT_SUCCESS;
exit:
if( exit_code != MBEDTLS_EXIT_SUCCESS )
{
#ifdef MBEDTLS_ERROR_C
mbedtls_strerror( ret, buf, sizeof( buf ) );
mbedtls_printf( " - %s\n", buf );
#else
mbedtls_printf("\n");
#endif
}
mbedtls_x509write_csr_free( &req );
mbedtls_pk_free( &key );
mbedtls_ctr_drbg_free( &ctr_drbg );
mbedtls_entropy_free( &entropy );
#if defined(_WIN32)
mbedtls_printf( " + Press Enter to exit this program.\n" );
fflush( stdout ); getchar();
#endif
mbedtls_exit( exit_code );
}
#endif /* MBEDTLS_X509_CSR_WRITE_C && MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO &&
MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_C && MBEDTLS_PEM_WRITE_C */
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