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mbedtls/programs/x509/cert_write.c

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/*
* Certificate generation and signing
*
* Copyright (C) 2006-2013, Brainspark B.V.
*
* This file is part of PolarSSL (http://www.polarssl.org)
* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
*
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "polarssl/config.h"
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#if !defined(POLARSSL_X509_CRT_WRITE_C) || \
!defined(POLARSSL_X509_CRT_PARSE_C) || !defined(POLARSSL_FS_IO) || \
!defined(POLARSSL_ENTROPY_C) || !defined(POLARSSL_CTR_DRBG_C) || \
!defined(POLARSSL_ERROR_C)
int main( int argc, char *argv[] )
{
((void) argc);
((void) argv);
printf( "POLARSSL_X509_CRT_WRITE_C and/or POLARSSL_X509_CRT_PARSE_C and/or "
"POLARSSL_FS_IO and/or "
"POLARSSL_ENTROPY_C and/or POLARSSL_CTR_DRBG_C and/or "
"POLARSSL_ERROR_C not defined.\n");
return( 0 );
}
#else
#include "polarssl/x509_crt.h"
#include "polarssl/x509_csr.h"
#include "polarssl/entropy.h"
#include "polarssl/ctr_drbg.h"
#include "polarssl/error.h"
#define DFL_ISSUER_CRT ""
#define DFL_REQUEST_FILE ""
#define DFL_SUBJECT_KEY "subject.key"
#define DFL_ISSUER_KEY "ca.key"
#define DFL_SUBJECT_PWD ""
#define DFL_ISSUER_PWD ""
#define DFL_OUTPUT_FILENAME "cert.crt"
#define DFL_SUBJECT_NAME "CN=Cert,O=PolarSSL,C=NL"
#define DFL_ISSUER_NAME "CN=CA,O=PolarSSL,C=NL"
#define DFL_NOT_BEFORE "20010101000000"
#define DFL_NOT_AFTER "20301231235959"
#define DFL_SERIAL "1"
#define DFL_SELFSIGN 0
#define DFL_IS_CA 0
#define DFL_MAX_PATHLEN -1
#define DFL_KEY_USAGE 0
#define DFL_NS_CERT_TYPE 0
/*
* global options
*/
struct options
{
const char *issuer_crt; /* filename of the issuer certificate */
const char *request_file; /* filename of the certificate request */
const char *subject_key; /* filename of the subject key file */
const char *issuer_key; /* filename of the issuer key file */
const char *subject_pwd; /* password for the subject key file */
const char *issuer_pwd; /* password for the issuer key file */
const char *output_file; /* where to store the constructed key file */
const char *subject_name; /* subject name for certificate */
const char *issuer_name; /* issuer name for certificate */
const char *not_before; /* validity period not before */
const char *not_after; /* validity period not after */
const char *serial; /* serial number string */
int selfsign; /* selfsign the certificate */
int is_ca; /* is a CA certificate */
int max_pathlen; /* maximum CA path length */
unsigned char key_usage; /* key usage flags */
unsigned char ns_cert_type; /* NS cert type */
} opt;
int write_certificate( x509write_cert *crt, 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 = x509write_crt_pem( crt, 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 )
return( -1 );
fclose(f);
return( 0 );
}
#if defined(POLARSSL_X509_CSR_PARSE_C)
#define USAGE_CSR \
" request_file=%%s default: (empty)\n" \
" If request_file is specified, subject_key,\n" \
" subject_pwd and subject_name are ignored!\n"
#else
#define USAGE_CSR ""
#endif /* POLARSSL_X509_CSR_PARSE_C */
#define USAGE \
"\n usage: cert_write param=<>...\n" \
"\n acceptable parameters:\n" \
USAGE_CSR \
" subject_key=%%s default: subject.key\n" \
" subject_pwd=%%s default: (empty)\n" \
" subject_name=%%s default: CN=Cert,O=PolarSSL,C=NL\n" \
"\n" \
" issuer_crt=%%s default: (empty)\n" \
" If issuer_crt is specified, issuer_name is\n" \
" ignored!\n" \
" issuer_name=%%s default: CN=CA,O=PolarSSL,C=NL\n" \
"\n" \
" selfsign=%%d default: 0 (false)\n" \
" If selfsign is enabled, issuer_name and\n" \
" issuer_key are required (issuer_crt and\n" \
" subject_* are ignored\n" \
" issuer_key=%%s default: ca.key\n" \
" issuer_pwd=%%s default: (empty)\n" \
" output_file=%%s default: cert.crt\n" \
" serial=%%s default: 1\n" \
" not_before=%%s default: 20010101000000\n"\
" not_after=%%s default: 20301231235959\n"\
" is_ca=%%d default: 0 (disabled)\n" \
" max_pathlen=%%d default: -1 (none)\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_certificate_sign\n" \
" crl_sign\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" \
"\n"
int main( int argc, char *argv[] )
{
int ret = 0;
x509_crt issuer_crt;
pk_context loaded_issuer_key, loaded_subject_key;
pk_context *issuer_key = &loaded_issuer_key,
*subject_key = &loaded_subject_key;
char buf[1024];
char issuer_name[128];
int i;
char *p, *q, *r;
#if defined(POLARSSL_X509_CSR_PARSE_C)
char subject_name[128];
x509_csr csr;
#endif
x509write_cert crt;
mpi serial;
entropy_context entropy;
ctr_drbg_context ctr_drbg;
const char *pers = "crt example app";
/*
* Set to sane values
*/
x509write_crt_init( &crt );
x509write_crt_set_md_alg( &crt, POLARSSL_MD_SHA1 );
pk_init( &loaded_issuer_key );
pk_init( &loaded_subject_key );
mpi_init( &serial );
#if defined(POLARSSL_X509_CSR_PARSE_C)
x509_csr_init( &csr );
#endif
x509_crt_init( &issuer_crt );
memset( buf, 0, 1024 );
if( argc == 0 )
{
usage:
printf( USAGE );
ret = 1;
goto exit;
}
opt.issuer_crt = DFL_ISSUER_CRT;
opt.request_file = DFL_REQUEST_FILE;
opt.request_file = DFL_REQUEST_FILE;
opt.subject_key = DFL_SUBJECT_KEY;
opt.issuer_key = DFL_ISSUER_KEY;
opt.subject_pwd = DFL_SUBJECT_PWD;
opt.issuer_pwd = DFL_ISSUER_PWD;
opt.output_file = DFL_OUTPUT_FILENAME;
opt.subject_name = DFL_SUBJECT_NAME;
opt.issuer_name = DFL_ISSUER_NAME;
opt.not_before = DFL_NOT_BEFORE;
opt.not_after = DFL_NOT_AFTER;
opt.serial = DFL_SERIAL;
opt.selfsign = DFL_SELFSIGN;
opt.is_ca = DFL_IS_CA;
opt.max_pathlen = DFL_MAX_PATHLEN;
opt.key_usage = DFL_KEY_USAGE;
opt.ns_cert_type = DFL_NS_CERT_TYPE;
for( i = 1; i < argc; i++ )
{
p = argv[i];
if( ( q = strchr( p, '=' ) ) == NULL )
goto usage;
*q++ = '\0';
if( strcmp( p, "request_file" ) == 0 )
opt.request_file = q;
else if( strcmp( p, "subject_key" ) == 0 )
opt.subject_key = q;
else if( strcmp( p, "issuer_key" ) == 0 )
opt.issuer_key = q;
else if( strcmp( p, "subject_pwd" ) == 0 )
opt.subject_pwd = q;
else if( strcmp( p, "issuer_pwd" ) == 0 )
opt.issuer_pwd = q;
else if( strcmp( p, "issuer_crt" ) == 0 )
opt.issuer_crt = q;
else if( strcmp( p, "output_file" ) == 0 )
opt.output_file = q;
else if( strcmp( p, "subject_name" ) == 0 )
{
opt.subject_name = q;
}
else if( strcmp( p, "issuer_name" ) == 0 )
{
opt.issuer_name = q;
}
else if( strcmp( p, "not_before" ) == 0 )
{
opt.not_before = q;
}
else if( strcmp( p, "not_after" ) == 0 )
{
opt.not_after = q;
}
else if( strcmp( p, "serial" ) == 0 )
{
opt.serial = q;
}
else if( strcmp( p, "selfsign" ) == 0 )
{
opt.selfsign = atoi( q );
if( opt.selfsign < 0 || opt.selfsign > 1 )
goto usage;
}
else if( strcmp( p, "is_ca" ) == 0 )
{
opt.is_ca = atoi( q );
if( opt.is_ca < 0 || opt.is_ca > 1 )
goto usage;
}
else if( strcmp( p, "max_pathlen" ) == 0 )
{
opt.max_pathlen = atoi( q );
if( opt.max_pathlen < -1 || opt.max_pathlen > 127 )
goto usage;
}
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 |= KU_DIGITAL_SIGNATURE;
else if( strcmp( q, "non_repudiation" ) == 0 )
opt.key_usage |= KU_NON_REPUDIATION;
else if( strcmp( q, "key_encipherment" ) == 0 )
opt.key_usage |= KU_KEY_ENCIPHERMENT;
else if( strcmp( q, "data_encipherment" ) == 0 )
opt.key_usage |= KU_DATA_ENCIPHERMENT;
else if( strcmp( q, "key_agreement" ) == 0 )
opt.key_usage |= KU_KEY_AGREEMENT;
else if( strcmp( q, "key_cert_sign" ) == 0 )
opt.key_usage |= KU_KEY_CERT_SIGN;
else if( strcmp( q, "crl_sign" ) == 0 )
opt.key_usage |= KU_CRL_SIGN;
else
goto usage;
q = r;
}
}
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 |= NS_CERT_TYPE_SSL_CLIENT;
else if( strcmp( q, "ssl_server" ) == 0 )
opt.ns_cert_type |= NS_CERT_TYPE_SSL_SERVER;
else if( strcmp( q, "email" ) == 0 )
opt.ns_cert_type |= NS_CERT_TYPE_EMAIL;
else if( strcmp( q, "object_signing" ) == 0 )
opt.ns_cert_type |= NS_CERT_TYPE_OBJECT_SIGNING;
else if( strcmp( q, "ssl_ca" ) == 0 )
opt.ns_cert_type |= NS_CERT_TYPE_SSL_CA;
else if( strcmp( q, "email_ca" ) == 0 )
opt.ns_cert_type |= NS_CERT_TYPE_EMAIL_CA;
else if( strcmp( q, "object_signing_ca" ) == 0 )
opt.ns_cert_type |= NS_CERT_TYPE_OBJECT_SIGNING_CA;
else
goto usage;
q = r;
}
}
else
goto usage;
}
printf("\n");
/*
* 0. Seed the PRNG
*/
printf( " . Seeding the random number generator..." );
fflush( stdout );
entropy_init( &entropy );
if( ( ret = ctr_drbg_init( &ctr_drbg, entropy_func, &entropy,
(const unsigned char *) pers,
strlen( pers ) ) ) != 0 )
{
error_strerror( ret, buf, 1024 );
printf( " failed\n ! ctr_drbg_init returned %d - %s\n", ret, buf );
goto exit;
}
printf( " ok\n" );
// Parse serial to MPI
//
printf( " . Reading serial number..." );
fflush( stdout );
if( ( ret = mpi_read_string( &serial, 10, opt.serial ) ) != 0 )
{
error_strerror( ret, buf, 1024 );
printf( " failed\n ! mpi_read_string returned -0x%02x - %s\n\n", -ret, buf );
goto exit;
}
printf( " ok\n" );
// Parse issuer certificate if present
//
if( !opt.selfsign && strlen( opt.issuer_crt ) )
{
/*
* 1.0.a. Load the certificates
*/
printf( " . Loading the issuer certificate ..." );
fflush( stdout );
if( ( ret = x509_crt_parse_file( &issuer_crt, opt.issuer_crt ) ) != 0 )
{
error_strerror( ret, buf, 1024 );
printf( " failed\n ! x509_crt_parse_file returned -0x%02x - %s\n\n", -ret, buf );
goto exit;
}
ret = x509_dn_gets( issuer_name, sizeof(issuer_name),
&issuer_crt.issuer );
if( ret < 0 )
{
error_strerror( ret, buf, 1024 );
printf( " failed\n ! x509_dn_gets returned -0x%02x - %s\n\n", -ret, buf );
goto exit;
}
opt.issuer_name = issuer_name;
printf( " ok\n" );
}
#if defined(POLARSSL_X509_CSR_PARSE_C)
// Parse certificate request if present
//
if( !opt.selfsign && strlen( opt.request_file ) )
{
/*
* 1.0.b. Load the CSR
*/
printf( " . Loading the certificate request ..." );
fflush( stdout );
if( ( ret = x509_csr_parse_file( &csr, opt.request_file ) ) != 0 )
{
error_strerror( ret, buf, 1024 );
printf( " failed\n ! x509_csr_parse_file returned -0x%02x - %s\n\n", -ret, buf );
goto exit;
}
ret = x509_dn_gets( subject_name, sizeof(subject_name),
&csr.subject );
if( ret < 0 )
{
error_strerror( ret, buf, 1024 );
printf( " failed\n ! x509_dn_gets returned -0x%02x - %s\n\n", -ret, buf );
goto exit;
}
opt.subject_name = subject_name;
subject_key = &csr.pk;
printf( " ok\n" );
}
#endif /* POLARSSL_X509_CSR_PARSE_C */
/*
* 1.1. Load the keys
*/
if( !opt.selfsign && !strlen( opt.request_file ) )
{
printf( " . Loading the subject key ..." );
fflush( stdout );
ret = pk_parse_keyfile( &loaded_subject_key, opt.subject_key,
opt.subject_pwd );
if( ret != 0 )
{
error_strerror( ret, buf, 1024 );
printf( " failed\n ! pk_parse_keyfile returned -0x%02x - %s\n\n", -ret, buf );
goto exit;
}
printf( " ok\n" );
}
printf( " . Loading the issuer key ..." );
fflush( stdout );
ret = pk_parse_keyfile( &loaded_issuer_key, opt.issuer_key,
opt.issuer_pwd );
if( ret != 0 )
{
error_strerror( ret, buf, 1024 );
printf( " failed\n ! pk_parse_keyfile returned -x%02x - %s\n\n", -ret, buf );
goto exit;
}
// Check if key and issuer certificate match
//
if( strlen( opt.issuer_crt ) )
{
if( !pk_can_do( &issuer_crt.pk, POLARSSL_PK_RSA ) ||
mpi_cmp_mpi( &pk_rsa( issuer_crt.pk )->N,
&pk_rsa( *issuer_key )->N ) != 0 ||
mpi_cmp_mpi( &pk_rsa( issuer_crt.pk )->E,
&pk_rsa( *issuer_key )->E ) != 0 )
{
printf( " failed\n ! issuer_key does not match issuer certificate\n\n" );
ret = -1;
goto exit;
}
}
printf( " ok\n" );
if( opt.selfsign )
{
opt.subject_name = opt.issuer_name;
subject_key = issuer_key;
}
x509write_crt_set_subject_key( &crt, subject_key );
x509write_crt_set_issuer_key( &crt, issuer_key );
/*
* 1.0. Check the names for validity
*/
if( ( ret = x509write_crt_set_subject_name( &crt, opt.subject_name ) ) != 0 )
{
error_strerror( ret, buf, 1024 );
printf( " failed\n ! x509write_crt_set_subject_name returned -0x%02x - %s\n\n", -ret, buf );
goto exit;
}
if( ( ret = x509write_crt_set_issuer_name( &crt, opt.issuer_name ) ) != 0 )
{
error_strerror( ret, buf, 1024 );
printf( " failed\n ! x509write_crt_set_issuer_name returned -0x%02x - %s\n\n", -ret, buf );
goto exit;
}
printf( " . Setting certificate values ..." );
fflush( stdout );
ret = x509write_crt_set_serial( &crt, &serial );
if( ret != 0 )
{
error_strerror( ret, buf, 1024 );
printf( " failed\n ! x509write_crt_set_serial returned -0x%02x - %s\n\n", -ret, buf );
goto exit;
}
ret = x509write_crt_set_validity( &crt, opt.not_before, opt.not_after );
if( ret != 0 )
{
error_strerror( ret, buf, 1024 );
printf( " failed\n ! x509write_crt_set_validity returned -0x%02x - %s\n\n", -ret, buf );
goto exit;
}
printf( " ok\n" );
printf( " . Adding the Basic Constraints extension ..." );
fflush( stdout );
ret = x509write_crt_set_basic_constraints( &crt, opt.is_ca,
opt.max_pathlen );
if( ret != 0 )
{
error_strerror( ret, buf, 1024 );
printf( " failed\n ! x509write_crt_set_basic_contraints returned -0x%02x - %s\n\n", -ret, buf );
goto exit;
}
printf( " ok\n" );
#if defined(POLARSSL_SHA1_C)
printf( " . Adding the Subject Key Identifier ..." );
fflush( stdout );
ret = x509write_crt_set_subject_key_identifier( &crt );
if( ret != 0 )
{
error_strerror( ret, buf, 1024 );
printf( " failed\n ! x509write_crt_set_subject_key_identifier returned -0x%02x - %s\n\n", -ret, buf );
goto exit;
}
printf( " ok\n" );
printf( " . Adding the Authority Key Identifier ..." );
fflush( stdout );
ret = x509write_crt_set_authority_key_identifier( &crt );
if( ret != 0 )
{
error_strerror( ret, buf, 1024 );
printf( " failed\n ! x509write_crt_set_authority_key_identifier returned -0x%02x - %s\n\n", -ret, buf );
goto exit;
}
printf( " ok\n" );
#endif /* POLARSSL_SHA1_C */
if( opt.key_usage )
{
printf( " . Adding the Key Usage extension ..." );
fflush( stdout );
ret = x509write_crt_set_key_usage( &crt, opt.key_usage );
if( ret != 0 )
{
error_strerror( ret, buf, 1024 );
printf( " failed\n ! x509write_crt_set_key_usage returned -0x%02x - %s\n\n", -ret, buf );
goto exit;
}
printf( " ok\n" );
}
if( opt.ns_cert_type )
{
printf( " . Adding the NS Cert Type extension ..." );
fflush( stdout );
ret = x509write_crt_set_ns_cert_type( &crt, opt.ns_cert_type );
if( ret != 0 )
{
error_strerror( ret, buf, 1024 );
printf( " failed\n ! x509write_crt_set_ns_cert_type returned -0x%02x - %s\n\n", -ret, buf );
goto exit;
}
printf( " ok\n" );
}
/*
* 1.2. Writing the request
*/
printf( " . Writing the certificate..." );
fflush( stdout );
if( ( ret = write_certificate( &crt, opt.output_file,
ctr_drbg_random, &ctr_drbg ) ) != 0 )
{
error_strerror( ret, buf, 1024 );
printf( " failed\n ! write_certifcate -0x%02x - %s\n\n", -ret, buf );
goto exit;
}
printf( " ok\n" );
exit:
x509write_crt_free( &crt );
pk_free( &loaded_subject_key );
pk_free( &loaded_issuer_key );
mpi_free( &serial );
entropy_free( &entropy );
#if defined(_WIN32)
printf( " + Press Enter to exit this program.\n" );
fflush( stdout ); getchar();
#endif
return( ret );
}
#endif /* POLARSSL_X509_CRT_WRITE_C && POLARSSL_X509_CRT_PARSE_C &&
POLARSSL_FS_IO && POLARSSL_ENTROPY_C && POLARSSL_CTR_DRBG_C &&
POLARSSL_ERROR_C */
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