/* * Certificate request generation * * Copyright (C) 2006-2011, ARM Limited, All Rights Reserved * * This file is part of mbed TLS (https://tls.mbed.org) * * 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. */ #if !defined(POLARSSL_CONFIG_FILE) #include "polarssl/config.h" #else #include POLARSSL_CONFIG_FILE #endif #if defined(POLARSSL_PLATFORM_C) #include "polarssl/platform.h" #else #include #define polarssl_printf printf #endif #if !defined(POLARSSL_X509_CSR_WRITE_C) || !defined(POLARSSL_FS_IO) || \ !defined(POLARSSL_PK_PARSE_C) || !defined(POLARSSL_SHA256_C) || \ !defined(POLARSSL_ENTROPY_C) || !defined(POLARSSL_CTR_DRBG_C) int main( void ) { polarssl_printf( "POLARSSL_X509_CSR_WRITE_C and/or POLARSSL_FS_IO and/or " "POLARSSL_PK_PARSE_C and/or POLARSSL_SHA256_c and/or " "POLARSSL_ENTROPY_C and/or POLARSSL_CTR_DRBG_C " "not defined.\n"); return( 0 ); } #else #include "polarssl/x509_csr.h" #include "polarssl/entropy.h" #include "polarssl/ctr_drbg.h" #include "polarssl/error.h" #include #include #include #define DFL_FILENAME "keyfile.key" #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_NS_CERT_TYPE 0 #define USAGE \ "\n usage: cert_req param=<>...\n" \ "\n acceptable parameters:\n" \ " filename=%%s default: keyfile.key\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_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" /* * global options */ struct options { const char *filename; /* filename of 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 */ unsigned char ns_cert_type; /* NS cert type */ } opt; int write_certificate_request( 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 = 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 = 0; pk_context key; char buf[1024]; int i; char *p, *q, *r; x509write_csr req; entropy_context entropy; ctr_drbg_context ctr_drbg; const char *pers = "csr example app"; /* * Set to sane values */ x509write_csr_init( &req ); x509write_csr_set_md_alg( &req, POLARSSL_MD_SHA256 ); pk_init( &key ); memset( buf, 0, sizeof( buf ) ); if( argc == 0 ) { usage: polarssl_printf( USAGE ); ret = 1; goto exit; } opt.filename = DFL_FILENAME; 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.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, "filename" ) == 0 ) opt.filename = 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, "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; } if( opt.key_usage ) x509write_csr_set_key_usage( &req, opt.key_usage ); if( opt.ns_cert_type ) x509write_csr_set_ns_cert_type( &req, opt.ns_cert_type ); /* * 0. Seed the PRNG */ polarssl_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 ) { polarssl_printf( " failed\n ! ctr_drbg_init returned %d", ret ); goto exit; } polarssl_printf( " ok\n" ); /* * 1.0. Check the subject name for validity */ polarssl_printf( " . Checking subjet name..." ); fflush( stdout ); if( ( ret = x509write_csr_set_subject_name( &req, opt.subject_name ) ) != 0 ) { polarssl_printf( " failed\n ! x509write_csr_set_subject_name returned %d", ret ); goto exit; } polarssl_printf( " ok\n" ); /* * 1.1. Load the key */ polarssl_printf( " . Loading the private key ..." ); fflush( stdout ); ret = pk_parse_keyfile( &key, opt.filename, NULL ); if( ret != 0 ) { polarssl_printf( " failed\n ! pk_parse_keyfile returned %d", ret ); goto exit; } x509write_csr_set_key( &req, &key ); polarssl_printf( " ok\n" ); /* * 1.2. Writing the request */ polarssl_printf( " . Writing the certificate request ..." ); fflush( stdout ); if( ( ret = write_certificate_request( &req, opt.output_file, ctr_drbg_random, &ctr_drbg ) ) != 0 ) { polarssl_printf( " failed\n ! write_certifcate_request %d", ret ); goto exit; } polarssl_printf( " ok\n" ); exit: if( ret != 0 && ret != 1) { #ifdef POLARSSL_ERROR_C polarssl_strerror( ret, buf, sizeof( buf ) ); polarssl_printf( " - %s\n", buf ); #else polarssl_printf("\n"); #endif } x509write_csr_free( &req ); pk_free( &key ); ctr_drbg_free( &ctr_drbg ); entropy_free( &entropy ); #if defined(_WIN32) polarssl_printf( " + Press Enter to exit this program.\n" ); fflush( stdout ); getchar(); #endif return( ret ); } #endif /* POLARSSL_X509_CSR_WRITE_C && POLARSSL_PK_PARSE_C && POLARSSL_FS_IO && POLARSSL_ENTROPY_C && POLARSSL_CTR_DRBG_C */