424 lines
11 KiB
C
424 lines
11 KiB
C
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/*
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* X.509 Certificate Signing Request (CSR) parsing
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*
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* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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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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* This file is part of mbed TLS (https://tls.mbed.org)
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*/
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/*
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* The ITU-T X.509 standard defines a certificate format for PKI.
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*
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* http://www.ietf.org/rfc/rfc5280.txt (Certificates and CRLs)
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* http://www.ietf.org/rfc/rfc3279.txt (Alg IDs for CRLs)
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* http://www.ietf.org/rfc/rfc2986.txt (CSRs, aka PKCS#10)
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*
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* http://www.itu.int/ITU-T/studygroups/com17/languages/X.680-0207.pdf
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* http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf
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*/
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "mbedtls/config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#if defined(MBEDTLS_X509_CSR_PARSE_C)
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#include "mbedtls/x509_csr.h"
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#include "mbedtls/oid.h"
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#include <string.h>
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#if defined(MBEDTLS_PEM_PARSE_C)
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#include "mbedtls/pem.h"
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#endif
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#if defined(MBEDTLS_PLATFORM_C)
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#include "mbedtls/platform.h"
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#else
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#include <stdlib.h>
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#include <stdio.h>
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#define mbedtls_free free
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#define mbedtls_calloc calloc
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#define mbedtls_snprintf snprintf
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#endif
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#if defined(MBEDTLS_FS_IO) || defined(EFIX64) || defined(EFI32)
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#include <stdio.h>
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#endif
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/* Implementation that should never be optimized out by the compiler */
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static void mbedtls_zeroize( void *v, size_t n ) {
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volatile unsigned char *p = v; while( n-- ) *p++ = 0;
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}
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/*
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* Version ::= INTEGER { v1(0) }
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*/
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static int x509_csr_get_version( unsigned char **p,
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const unsigned char *end,
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int *ver )
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{
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int ret;
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if( ( ret = mbedtls_asn1_get_int( p, end, ver ) ) != 0 )
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{
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if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
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{
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*ver = 0;
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return( 0 );
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}
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return( MBEDTLS_ERR_X509_INVALID_VERSION + ret );
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}
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return( 0 );
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}
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/*
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* Parse a CSR in DER format
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*/
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int mbedtls_x509_csr_parse_der( mbedtls_x509_csr *csr,
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const unsigned char *buf, size_t buflen )
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{
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int ret;
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size_t len;
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unsigned char *p, *end;
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mbedtls_x509_buf sig_params;
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memset( &sig_params, 0, sizeof( mbedtls_x509_buf ) );
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/*
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* Check for valid input
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*/
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if( csr == NULL || buf == NULL || buflen == 0 )
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return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
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mbedtls_x509_csr_init( csr );
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/*
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* first copy the raw DER data
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*/
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p = mbedtls_calloc( 1, len = buflen );
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if( p == NULL )
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return( MBEDTLS_ERR_X509_ALLOC_FAILED );
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memcpy( p, buf, buflen );
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csr->raw.p = p;
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csr->raw.len = len;
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end = p + len;
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/*
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* CertificationRequest ::= SEQUENCE {
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* certificationRequestInfo CertificationRequestInfo,
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* signatureAlgorithm AlgorithmIdentifier,
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* signature BIT STRING
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* }
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*/
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if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
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MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
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{
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mbedtls_x509_csr_free( csr );
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return( MBEDTLS_ERR_X509_INVALID_FORMAT );
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}
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if( len != (size_t) ( end - p ) )
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{
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mbedtls_x509_csr_free( csr );
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return( MBEDTLS_ERR_X509_INVALID_FORMAT +
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MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
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}
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/*
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* CertificationRequestInfo ::= SEQUENCE {
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*/
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csr->cri.p = p;
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if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
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MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
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{
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mbedtls_x509_csr_free( csr );
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return( MBEDTLS_ERR_X509_INVALID_FORMAT + ret );
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}
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end = p + len;
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csr->cri.len = end - csr->cri.p;
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/*
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* Version ::= INTEGER { v1(0) }
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*/
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if( ( ret = x509_csr_get_version( &p, end, &csr->version ) ) != 0 )
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{
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mbedtls_x509_csr_free( csr );
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return( ret );
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}
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if( csr->version != 0 )
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{
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mbedtls_x509_csr_free( csr );
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return( MBEDTLS_ERR_X509_UNKNOWN_VERSION );
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}
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csr->version++;
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/*
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* subject Name
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*/
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csr->subject_raw.p = p;
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if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
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MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
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{
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mbedtls_x509_csr_free( csr );
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return( MBEDTLS_ERR_X509_INVALID_FORMAT + ret );
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}
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if( ( ret = mbedtls_x509_get_name( &p, p + len, &csr->subject ) ) != 0 )
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{
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mbedtls_x509_csr_free( csr );
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return( ret );
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}
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csr->subject_raw.len = p - csr->subject_raw.p;
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/*
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* subjectPKInfo SubjectPublicKeyInfo
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*/
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if( ( ret = mbedtls_pk_parse_subpubkey( &p, end, &csr->pk ) ) != 0 )
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{
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mbedtls_x509_csr_free( csr );
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return( ret );
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}
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/*
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* attributes [0] Attributes
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*
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* The list of possible attributes is open-ended, though RFC 2985
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* (PKCS#9) defines a few in section 5.4. We currently don't support any,
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* so we just ignore them. This is a safe thing to do as the worst thing
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* that could happen is that we issue a certificate that does not match
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* the requester's expectations - this cannot cause a violation of our
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* signature policies.
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*/
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if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
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MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_CONTEXT_SPECIFIC ) ) != 0 )
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{
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mbedtls_x509_csr_free( csr );
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return( MBEDTLS_ERR_X509_INVALID_FORMAT + ret );
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}
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p += len;
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end = csr->raw.p + csr->raw.len;
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/*
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* signatureAlgorithm AlgorithmIdentifier,
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* signature BIT STRING
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*/
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if( ( ret = mbedtls_x509_get_alg( &p, end, &csr->sig_oid, &sig_params ) ) != 0 )
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{
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mbedtls_x509_csr_free( csr );
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return( ret );
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}
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if( ( ret = mbedtls_x509_get_sig_alg( &csr->sig_oid, &sig_params,
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&csr->sig_md, &csr->sig_pk,
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&csr->sig_opts ) ) != 0 )
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{
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mbedtls_x509_csr_free( csr );
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return( MBEDTLS_ERR_X509_UNKNOWN_SIG_ALG );
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}
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if( ( ret = mbedtls_x509_get_sig( &p, end, &csr->sig ) ) != 0 )
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{
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mbedtls_x509_csr_free( csr );
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return( ret );
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}
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if( p != end )
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{
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mbedtls_x509_csr_free( csr );
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return( MBEDTLS_ERR_X509_INVALID_FORMAT +
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MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
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}
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return( 0 );
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}
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/*
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* Parse a CSR, allowing for PEM or raw DER encoding
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*/
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int mbedtls_x509_csr_parse( mbedtls_x509_csr *csr, const unsigned char *buf, size_t buflen )
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{
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#if defined(MBEDTLS_PEM_PARSE_C)
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int ret;
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size_t use_len;
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mbedtls_pem_context pem;
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#endif
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/*
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* Check for valid input
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*/
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if( csr == NULL || buf == NULL || buflen == 0 )
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return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
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#if defined(MBEDTLS_PEM_PARSE_C)
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mbedtls_pem_init( &pem );
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/* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
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if( buf[buflen - 1] != '\0' )
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ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
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else
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ret = mbedtls_pem_read_buffer( &pem,
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"-----BEGIN CERTIFICATE REQUEST-----",
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"-----END CERTIFICATE REQUEST-----",
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buf, NULL, 0, &use_len );
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if( ret == 0 )
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{
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/*
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* Was PEM encoded, parse the result
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*/
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if( ( ret = mbedtls_x509_csr_parse_der( csr, pem.buf, pem.buflen ) ) != 0 )
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return( ret );
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mbedtls_pem_free( &pem );
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return( 0 );
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}
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else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
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{
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mbedtls_pem_free( &pem );
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return( ret );
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}
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else
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#endif /* MBEDTLS_PEM_PARSE_C */
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return( mbedtls_x509_csr_parse_der( csr, buf, buflen ) );
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}
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#if defined(MBEDTLS_FS_IO)
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/*
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* Load a CSR into the structure
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*/
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int mbedtls_x509_csr_parse_file( mbedtls_x509_csr *csr, const char *path )
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{
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int ret;
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size_t n;
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unsigned char *buf;
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if( ( ret = mbedtls_pk_load_file( path, &buf, &n ) ) != 0 )
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return( ret );
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ret = mbedtls_x509_csr_parse( csr, buf, n );
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mbedtls_zeroize( buf, n );
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mbedtls_free( buf );
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return( ret );
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}
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#endif /* MBEDTLS_FS_IO */
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#define BEFORE_COLON 14
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#define BC "14"
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/*
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* Return an informational string about the CSR.
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*/
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int mbedtls_x509_csr_info( char *buf, size_t size, const char *prefix,
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const mbedtls_x509_csr *csr )
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{
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int ret;
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size_t n;
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char *p;
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char key_size_str[BEFORE_COLON];
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p = buf;
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n = size;
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ret = mbedtls_snprintf( p, n, "%sCSR version : %d",
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prefix, csr->version );
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MBEDTLS_X509_SAFE_SNPRINTF;
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ret = mbedtls_snprintf( p, n, "\n%ssubject name : ", prefix );
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MBEDTLS_X509_SAFE_SNPRINTF;
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ret = mbedtls_x509_dn_gets( p, n, &csr->subject );
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MBEDTLS_X509_SAFE_SNPRINTF;
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ret = mbedtls_snprintf( p, n, "\n%ssigned using : ", prefix );
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MBEDTLS_X509_SAFE_SNPRINTF;
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ret = mbedtls_x509_sig_alg_gets( p, n, &csr->sig_oid, csr->sig_pk, csr->sig_md,
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csr->sig_opts );
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MBEDTLS_X509_SAFE_SNPRINTF;
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if( ( ret = mbedtls_x509_key_size_helper( key_size_str, BEFORE_COLON,
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mbedtls_pk_get_name( &csr->pk ) ) ) != 0 )
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{
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|
|
return( ret );
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = mbedtls_snprintf( p, n, "\n%s%-" BC "s: %d bits\n", prefix, key_size_str,
|
||
|
|
(int) mbedtls_pk_get_bitlen( &csr->pk ) );
|
||
|
|
MBEDTLS_X509_SAFE_SNPRINTF;
|
||
|
|
|
||
|
|
return( (int) ( size - n ) );
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Initialize a CSR
|
||
|
|
*/
|
||
|
|
void mbedtls_x509_csr_init( mbedtls_x509_csr *csr )
|
||
|
|
{
|
||
|
|
memset( csr, 0, sizeof(mbedtls_x509_csr) );
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Unallocate all CSR data
|
||
|
|
*/
|
||
|
|
void mbedtls_x509_csr_free( mbedtls_x509_csr *csr )
|
||
|
|
{
|
||
|
|
mbedtls_x509_name *name_cur;
|
||
|
|
mbedtls_x509_name *name_prv;
|
||
|
|
|
||
|
|
if( csr == NULL )
|
||
|
|
return;
|
||
|
|
|
||
|
|
mbedtls_pk_free( &csr->pk );
|
||
|
|
|
||
|
|
#if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
|
||
|
|
mbedtls_free( csr->sig_opts );
|
||
|
|
#endif
|
||
|
|
|
||
|
|
name_cur = csr->subject.next;
|
||
|
|
while( name_cur != NULL )
|
||
|
|
{
|
||
|
|
name_prv = name_cur;
|
||
|
|
name_cur = name_cur->next;
|
||
|
|
mbedtls_zeroize( name_prv, sizeof( mbedtls_x509_name ) );
|
||
|
|
mbedtls_free( name_prv );
|
||
|
|
}
|
||
|
|
|
||
|
|
if( csr->raw.p != NULL )
|
||
|
|
{
|
||
|
|
mbedtls_zeroize( csr->raw.p, csr->raw.len );
|
||
|
|
mbedtls_free( csr->raw.p );
|
||
|
|
}
|
||
|
|
|
||
|
|
mbedtls_zeroize( csr, sizeof( mbedtls_x509_csr ) );
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* MBEDTLS_X509_CSR_PARSE_C */
|