| /* |
| * X.509 Certificate Signing Request writing |
| * |
| * Copyright (C) 2006-2015, 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. |
| */ |
| /* |
| * References: |
| * - CSRs: PKCS#10 v1.7 aka RFC 2986 |
| * - attributes: PKCS#9 v2.0 aka RFC 2985 |
| */ |
| |
| #if !defined(MBEDTLS_CONFIG_FILE) |
| #include "mbedtls/config.h" |
| #else |
| #include MBEDTLS_CONFIG_FILE |
| #endif |
| |
| #if defined(MBEDTLS_X509_CSR_WRITE_C) |
| |
| #include "mbedtls/x509_csr.h" |
| #include "mbedtls/oid.h" |
| #include "mbedtls/asn1write.h" |
| |
| #include <string.h> |
| #include <stdlib.h> |
| |
| #if defined(MBEDTLS_PEM_WRITE_C) |
| #include "mbedtls/pem.h" |
| #endif |
| |
| /* Implementation that should never be optimized out by the compiler */ |
| static void mbedtls_zeroize( void *v, size_t n ) { |
| volatile unsigned char *p = v; while( n-- ) *p++ = 0; |
| } |
| |
| void mbedtls_x509write_csr_init( mbedtls_x509write_csr *ctx ) |
| { |
| memset( ctx, 0, sizeof(mbedtls_x509write_csr) ); |
| } |
| |
| void mbedtls_x509write_csr_free( mbedtls_x509write_csr *ctx ) |
| { |
| mbedtls_asn1_free_named_data_list( &ctx->subject ); |
| mbedtls_asn1_free_named_data_list( &ctx->extensions ); |
| |
| mbedtls_zeroize( ctx, sizeof(mbedtls_x509write_csr) ); |
| } |
| |
| void mbedtls_x509write_csr_set_md_alg( mbedtls_x509write_csr *ctx, mbedtls_md_type_t md_alg ) |
| { |
| ctx->md_alg = md_alg; |
| } |
| |
| void mbedtls_x509write_csr_set_key( mbedtls_x509write_csr *ctx, mbedtls_pk_context *key ) |
| { |
| ctx->key = key; |
| } |
| |
| int mbedtls_x509write_csr_set_subject_name( mbedtls_x509write_csr *ctx, |
| const char *subject_name ) |
| { |
| return mbedtls_x509_string_to_names( &ctx->subject, subject_name ); |
| } |
| |
| int mbedtls_x509write_csr_set_extension( mbedtls_x509write_csr *ctx, |
| const char *oid, size_t oid_len, |
| const unsigned char *val, size_t val_len ) |
| { |
| return mbedtls_x509_set_extension( &ctx->extensions, oid, oid_len, |
| 0, val, val_len ); |
| } |
| |
| int mbedtls_x509write_csr_set_key_usage( mbedtls_x509write_csr *ctx, unsigned char key_usage ) |
| { |
| unsigned char buf[4]; |
| unsigned char *c; |
| int ret; |
| |
| c = buf + 4; |
| |
| if( ( ret = mbedtls_asn1_write_bitstring( &c, buf, &key_usage, 7 ) ) != 4 ) |
| return( ret ); |
| |
| ret = mbedtls_x509write_csr_set_extension( ctx, MBEDTLS_OID_KEY_USAGE, |
| MBEDTLS_OID_SIZE( MBEDTLS_OID_KEY_USAGE ), |
| buf, 4 ); |
| if( ret != 0 ) |
| return( ret ); |
| |
| return( 0 ); |
| } |
| |
| int mbedtls_x509write_csr_set_ns_cert_type( mbedtls_x509write_csr *ctx, |
| unsigned char ns_cert_type ) |
| { |
| unsigned char buf[4]; |
| unsigned char *c; |
| int ret; |
| |
| c = buf + 4; |
| |
| if( ( ret = mbedtls_asn1_write_bitstring( &c, buf, &ns_cert_type, 8 ) ) != 4 ) |
| return( ret ); |
| |
| ret = mbedtls_x509write_csr_set_extension( ctx, MBEDTLS_OID_NS_CERT_TYPE, |
| MBEDTLS_OID_SIZE( MBEDTLS_OID_NS_CERT_TYPE ), |
| buf, 4 ); |
| if( ret != 0 ) |
| return( ret ); |
| |
| return( 0 ); |
| } |
| |
| int mbedtls_x509write_csr_der( mbedtls_x509write_csr *ctx, unsigned char *buf, size_t size, |
| int (*f_rng)(void *, unsigned char *, size_t), |
| void *p_rng ) |
| { |
| int ret; |
| const char *sig_oid; |
| size_t sig_oid_len = 0; |
| unsigned char *c, *c2; |
| unsigned char hash[64]; |
| unsigned char sig[MBEDTLS_MPI_MAX_SIZE]; |
| unsigned char tmp_buf[2048]; |
| size_t pub_len = 0, sig_and_oid_len = 0, sig_len; |
| size_t len = 0; |
| mbedtls_pk_type_t pk_alg; |
| |
| /* |
| * Prepare data to be signed in tmp_buf |
| */ |
| c = tmp_buf + sizeof( tmp_buf ); |
| |
| MBEDTLS_ASN1_CHK_ADD( len, mbedtls_x509_write_extensions( &c, tmp_buf, ctx->extensions ) ); |
| |
| if( len ) |
| { |
| MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) ); |
| MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED | |
| MBEDTLS_ASN1_SEQUENCE ) ); |
| |
| MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) ); |
| MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED | |
| MBEDTLS_ASN1_SET ) ); |
| |
| MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_oid( &c, tmp_buf, MBEDTLS_OID_PKCS9_CSR_EXT_REQ, |
| MBEDTLS_OID_SIZE( MBEDTLS_OID_PKCS9_CSR_EXT_REQ ) ) ); |
| |
| MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) ); |
| MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED | |
| MBEDTLS_ASN1_SEQUENCE ) ); |
| } |
| |
| MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) ); |
| MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED | |
| MBEDTLS_ASN1_CONTEXT_SPECIFIC ) ); |
| |
| MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_pk_write_pubkey_der( ctx->key, |
| tmp_buf, c - tmp_buf ) ); |
| c -= pub_len; |
| len += pub_len; |
| |
| /* |
| * Subject ::= Name |
| */ |
| MBEDTLS_ASN1_CHK_ADD( len, mbedtls_x509_write_names( &c, tmp_buf, ctx->subject ) ); |
| |
| /* |
| * Version ::= INTEGER { v1(0), v2(1), v3(2) } |
| */ |
| MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_int( &c, tmp_buf, 0 ) ); |
| |
| MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) ); |
| MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED | |
| MBEDTLS_ASN1_SEQUENCE ) ); |
| |
| /* |
| * Prepare signature |
| */ |
| mbedtls_md( mbedtls_md_info_from_type( ctx->md_alg ), c, len, hash ); |
| |
| pk_alg = mbedtls_pk_get_type( ctx->key ); |
| if( pk_alg == MBEDTLS_PK_ECKEY ) |
| pk_alg = MBEDTLS_PK_ECDSA; |
| |
| if( ( ret = mbedtls_pk_sign( ctx->key, ctx->md_alg, hash, 0, sig, &sig_len, |
| f_rng, p_rng ) ) != 0 || |
| ( ret = mbedtls_oid_get_oid_by_sig_alg( pk_alg, ctx->md_alg, |
| &sig_oid, &sig_oid_len ) ) != 0 ) |
| { |
| return( ret ); |
| } |
| |
| /* |
| * Write data to output buffer |
| */ |
| c2 = buf + size; |
| MBEDTLS_ASN1_CHK_ADD( sig_and_oid_len, mbedtls_x509_write_sig( &c2, buf, |
| sig_oid, sig_oid_len, sig, sig_len ) ); |
| |
| c2 -= len; |
| memcpy( c2, c, len ); |
| |
| len += sig_and_oid_len; |
| MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c2, buf, len ) ); |
| MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c2, buf, MBEDTLS_ASN1_CONSTRUCTED | |
| MBEDTLS_ASN1_SEQUENCE ) ); |
| |
| return( (int) len ); |
| } |
| |
| #define PEM_BEGIN_CSR "-----BEGIN CERTIFICATE REQUEST-----\n" |
| #define PEM_END_CSR "-----END CERTIFICATE REQUEST-----\n" |
| |
| #if defined(MBEDTLS_PEM_WRITE_C) |
| int mbedtls_x509write_csr_pem( mbedtls_x509write_csr *ctx, unsigned char *buf, size_t size, |
| int (*f_rng)(void *, unsigned char *, size_t), |
| void *p_rng ) |
| { |
| int ret; |
| unsigned char output_buf[4096]; |
| size_t olen = 0; |
| |
| if( ( ret = mbedtls_x509write_csr_der( ctx, output_buf, sizeof(output_buf), |
| f_rng, p_rng ) ) < 0 ) |
| { |
| return( ret ); |
| } |
| |
| if( ( ret = mbedtls_pem_write_buffer( PEM_BEGIN_CSR, PEM_END_CSR, |
| output_buf + sizeof(output_buf) - ret, |
| ret, buf, size, &olen ) ) != 0 ) |
| { |
| return( ret ); |
| } |
| |
| return( 0 ); |
| } |
| #endif /* MBEDTLS_PEM_WRITE_C */ |
| |
| #endif /* MBEDTLS_X509_CSR_WRITE_C */ |
