1752 lines
44 KiB
C
1752 lines
44 KiB
C
/*
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* X.509 certificate and private key decoding
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*
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* Based on XySSL: Copyright (C) 2006-2008 Christophe Devine
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*
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* Copyright (C) 2009 Paul Bakker
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/*
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* The ITU-T X.509 standard defines a certificat format for PKI.
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*
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* http://www.ietf.org/rfc/rfc2459.txt
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* http://www.ietf.org/rfc/rfc3279.txt
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*
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* ftp://ftp.rsasecurity.com/pub/pkcs/ascii/pkcs-1v2.asc
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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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#include "polarssl/config.h"
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#if defined(POLARSSL_X509_PARSE_C)
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#include "polarssl/x509.h"
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#include "polarssl/base64.h"
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#include "polarssl/des.h"
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#include "polarssl/md2.h"
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#include "polarssl/md4.h"
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#include "polarssl/md5.h"
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#include "polarssl/sha1.h"
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <time.h>
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/*
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* ASN.1 DER decoding routines
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*/
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static int asn1_get_len( unsigned char **p,
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unsigned char *end,
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int *len )
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{
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if( ( end - *p ) < 1 )
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return( POLARSSL_ERR_ASN1_OUT_OF_DATA );
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if( ( **p & 0x80 ) == 0 )
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*len = *(*p)++;
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else
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{
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switch( **p & 0x7F )
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{
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case 1:
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if( ( end - *p ) < 2 )
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return( POLARSSL_ERR_ASN1_OUT_OF_DATA );
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*len = (*p)[1];
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(*p) += 2;
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break;
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case 2:
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if( ( end - *p ) < 3 )
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return( POLARSSL_ERR_ASN1_OUT_OF_DATA );
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*len = ( (*p)[1] << 8 ) | (*p)[2];
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(*p) += 3;
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break;
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default:
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return( POLARSSL_ERR_ASN1_INVALID_LENGTH );
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break;
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}
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}
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if( *len > (int) ( end - *p ) )
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return( POLARSSL_ERR_ASN1_OUT_OF_DATA );
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return( 0 );
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}
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static int asn1_get_tag( unsigned char **p,
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unsigned char *end,
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int *len, int tag )
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{
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if( ( end - *p ) < 1 )
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return( POLARSSL_ERR_ASN1_OUT_OF_DATA );
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if( **p != tag )
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return( POLARSSL_ERR_ASN1_UNEXPECTED_TAG );
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(*p)++;
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return( asn1_get_len( p, end, len ) );
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}
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static int asn1_get_bool( unsigned char **p,
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unsigned char *end,
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int *val )
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{
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int ret, len;
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if( ( ret = asn1_get_tag( p, end, &len, ASN1_BOOLEAN ) ) != 0 )
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return( ret );
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if( len != 1 )
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return( POLARSSL_ERR_ASN1_INVALID_LENGTH );
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*val = ( **p != 0 ) ? 1 : 0;
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(*p)++;
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return( 0 );
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}
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static int asn1_get_int( unsigned char **p,
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unsigned char *end,
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int *val )
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{
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int ret, len;
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if( ( ret = asn1_get_tag( p, end, &len, ASN1_INTEGER ) ) != 0 )
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return( ret );
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if( len > (int) sizeof( int ) || ( **p & 0x80 ) != 0 )
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return( POLARSSL_ERR_ASN1_INVALID_LENGTH );
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*val = 0;
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while( len-- > 0 )
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{
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*val = ( *val << 8 ) | **p;
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(*p)++;
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}
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return( 0 );
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}
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static int asn1_get_mpi( unsigned char **p,
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unsigned char *end,
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mpi *X )
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{
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int ret, len;
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if( ( ret = asn1_get_tag( p, end, &len, ASN1_INTEGER ) ) != 0 )
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return( ret );
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ret = mpi_read_binary( X, *p, len );
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*p += len;
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return( ret );
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}
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/*
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* Version ::= INTEGER { v1(0), v2(1), v3(2) }
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*/
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static int x509_get_version( unsigned char **p,
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unsigned char *end,
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int *ver )
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{
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int ret, len;
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if( ( ret = asn1_get_tag( p, end, &len,
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ASN1_CONTEXT_SPECIFIC | ASN1_CONSTRUCTED | 0 ) ) != 0 )
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{
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if( ret == POLARSSL_ERR_ASN1_UNEXPECTED_TAG )
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return( *ver = 0 );
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return( ret );
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}
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end = *p + len;
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if( ( ret = asn1_get_int( p, end, ver ) ) != 0 )
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return( POLARSSL_ERR_X509_CERT_INVALID_VERSION | ret );
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if( *p != end )
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return( POLARSSL_ERR_X509_CERT_INVALID_VERSION |
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POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
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return( 0 );
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}
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/*
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* CertificateSerialNumber ::= INTEGER
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*/
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static int x509_get_serial( unsigned char **p,
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unsigned char *end,
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x509_buf *serial )
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{
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int ret;
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if( ( end - *p ) < 1 )
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return( POLARSSL_ERR_X509_CERT_INVALID_SERIAL |
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POLARSSL_ERR_ASN1_OUT_OF_DATA );
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if( **p != ( ASN1_CONTEXT_SPECIFIC | ASN1_PRIMITIVE | 2 ) &&
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**p != ASN1_INTEGER )
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return( POLARSSL_ERR_X509_CERT_INVALID_SERIAL |
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POLARSSL_ERR_ASN1_UNEXPECTED_TAG );
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serial->tag = *(*p)++;
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if( ( ret = asn1_get_len( p, end, &serial->len ) ) != 0 )
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return( POLARSSL_ERR_X509_CERT_INVALID_SERIAL | ret );
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serial->p = *p;
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*p += serial->len;
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return( 0 );
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}
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/*
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* AlgorithmIdentifier ::= SEQUENCE {
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* algorithm OBJECT IDENTIFIER,
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* parameters ANY DEFINED BY algorithm OPTIONAL }
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*/
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static int x509_get_alg( unsigned char **p,
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unsigned char *end,
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x509_buf *alg )
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{
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int ret, len;
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if( ( ret = asn1_get_tag( p, end, &len,
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ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
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return( POLARSSL_ERR_X509_CERT_INVALID_ALG | ret );
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end = *p + len;
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alg->tag = **p;
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if( ( ret = asn1_get_tag( p, end, &alg->len, ASN1_OID ) ) != 0 )
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return( POLARSSL_ERR_X509_CERT_INVALID_ALG | ret );
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alg->p = *p;
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*p += alg->len;
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if( *p == end )
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return( 0 );
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/*
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* assume the algorithm parameters must be NULL
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*/
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if( ( ret = asn1_get_tag( p, end, &len, ASN1_NULL ) ) != 0 )
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return( POLARSSL_ERR_X509_CERT_INVALID_ALG | ret );
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if( *p != end )
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return( POLARSSL_ERR_X509_CERT_INVALID_ALG |
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POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
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return( 0 );
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}
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/*
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* RelativeDistinguishedName ::=
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* SET OF AttributeTypeAndValue
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*
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* AttributeTypeAndValue ::= SEQUENCE {
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* type AttributeType,
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* value AttributeValue }
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*
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* AttributeType ::= OBJECT IDENTIFIER
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*
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* AttributeValue ::= ANY DEFINED BY AttributeType
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*/
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static int x509_get_name( unsigned char **p,
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unsigned char *end,
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x509_name *cur )
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{
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int ret, len;
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unsigned char *end2;
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x509_buf *oid;
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x509_buf *val;
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if( ( ret = asn1_get_tag( p, end, &len,
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ASN1_CONSTRUCTED | ASN1_SET ) ) != 0 )
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return( POLARSSL_ERR_X509_CERT_INVALID_NAME | ret );
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end2 = end;
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end = *p + len;
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if( ( ret = asn1_get_tag( p, end, &len,
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ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
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return( POLARSSL_ERR_X509_CERT_INVALID_NAME | ret );
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if( *p + len != end )
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return( POLARSSL_ERR_X509_CERT_INVALID_NAME |
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POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
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oid = &cur->oid;
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oid->tag = **p;
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if( ( ret = asn1_get_tag( p, end, &oid->len, ASN1_OID ) ) != 0 )
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return( POLARSSL_ERR_X509_CERT_INVALID_NAME | ret );
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oid->p = *p;
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*p += oid->len;
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if( ( end - *p ) < 1 )
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return( POLARSSL_ERR_X509_CERT_INVALID_NAME |
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POLARSSL_ERR_ASN1_OUT_OF_DATA );
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if( **p != ASN1_BMP_STRING && **p != ASN1_UTF8_STRING &&
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**p != ASN1_T61_STRING && **p != ASN1_PRINTABLE_STRING &&
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**p != ASN1_IA5_STRING && **p != ASN1_UNIVERSAL_STRING )
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return( POLARSSL_ERR_X509_CERT_INVALID_NAME |
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POLARSSL_ERR_ASN1_UNEXPECTED_TAG );
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val = &cur->val;
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val->tag = *(*p)++;
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if( ( ret = asn1_get_len( p, end, &val->len ) ) != 0 )
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return( POLARSSL_ERR_X509_CERT_INVALID_NAME | ret );
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val->p = *p;
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*p += val->len;
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cur->next = NULL;
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if( *p != end )
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return( POLARSSL_ERR_X509_CERT_INVALID_NAME |
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POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
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/*
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* recurse until end of SEQUENCE is reached
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*/
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if( *p == end2 )
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return( 0 );
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cur->next = (x509_name *) malloc(
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sizeof( x509_name ) );
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if( cur->next == NULL )
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return( 1 );
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return( x509_get_name( p, end2, cur->next ) );
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}
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/*
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* Validity ::= SEQUENCE {
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* notBefore Time,
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* notAfter Time }
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*
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* Time ::= CHOICE {
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* utcTime UTCTime,
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* generalTime GeneralizedTime }
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*/
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static int x509_get_dates( unsigned char **p,
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unsigned char *end,
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x509_time *from,
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x509_time *to )
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{
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int ret, len;
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char date[64];
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if( ( ret = asn1_get_tag( p, end, &len,
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ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
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return( POLARSSL_ERR_X509_CERT_INVALID_DATE | ret );
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end = *p + len;
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/*
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* TODO: also handle GeneralizedTime
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*/
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if( ( ret = asn1_get_tag( p, end, &len, ASN1_UTC_TIME ) ) != 0 )
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return( POLARSSL_ERR_X509_CERT_INVALID_DATE | ret );
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memset( date, 0, sizeof( date ) );
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memcpy( date, *p, ( len < (int) sizeof( date ) - 1 ) ?
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len : (int) sizeof( date ) - 1 );
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if( sscanf( date, "%2d%2d%2d%2d%2d%2d",
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&from->year, &from->mon, &from->day,
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&from->hour, &from->min, &from->sec ) < 5 )
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return( POLARSSL_ERR_X509_CERT_INVALID_DATE );
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from->year += 100 * ( from->year < 90 );
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from->year += 1900;
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*p += len;
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if( ( ret = asn1_get_tag( p, end, &len, ASN1_UTC_TIME ) ) != 0 )
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return( POLARSSL_ERR_X509_CERT_INVALID_DATE | ret );
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memset( date, 0, sizeof( date ) );
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memcpy( date, *p, ( len < (int) sizeof( date ) - 1 ) ?
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len : (int) sizeof( date ) - 1 );
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if( sscanf( date, "%2d%2d%2d%2d%2d%2d",
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&to->year, &to->mon, &to->day,
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&to->hour, &to->min, &to->sec ) < 5 )
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return( POLARSSL_ERR_X509_CERT_INVALID_DATE );
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to->year += 100 * ( to->year < 90 );
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to->year += 1900;
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*p += len;
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if( *p != end )
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return( POLARSSL_ERR_X509_CERT_INVALID_DATE |
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POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
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return( 0 );
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}
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/*
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* SubjectPublicKeyInfo ::= SEQUENCE {
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* algorithm AlgorithmIdentifier,
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* subjectPublicKey BIT STRING }
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*/
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static int x509_get_pubkey( unsigned char **p,
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unsigned char *end,
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x509_buf *pk_alg_oid,
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mpi *N, mpi *E )
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{
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int ret, len;
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unsigned char *end2;
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if( ( ret = x509_get_alg( p, end, pk_alg_oid ) ) != 0 )
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return( ret );
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/*
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* only RSA public keys handled at this time
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*/
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if( pk_alg_oid->len != 9 ||
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memcmp( pk_alg_oid->p, OID_PKCS1_RSA, 9 ) != 0 )
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return( POLARSSL_ERR_X509_CERT_UNKNOWN_PK_ALG );
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if( ( ret = asn1_get_tag( p, end, &len, ASN1_BIT_STRING ) ) != 0 )
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return( POLARSSL_ERR_X509_CERT_INVALID_PUBKEY | ret );
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if( ( end - *p ) < 1 )
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return( POLARSSL_ERR_X509_CERT_INVALID_PUBKEY |
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POLARSSL_ERR_ASN1_OUT_OF_DATA );
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end2 = *p + len;
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if( *(*p)++ != 0 )
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return( POLARSSL_ERR_X509_CERT_INVALID_PUBKEY );
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|
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/*
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* RSAPublicKey ::= SEQUENCE {
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* modulus INTEGER, -- n
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* publicExponent INTEGER -- e
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* }
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*/
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if( ( ret = asn1_get_tag( p, end2, &len,
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ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
|
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return( POLARSSL_ERR_X509_CERT_INVALID_PUBKEY | ret );
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|
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if( *p + len != end2 )
|
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return( POLARSSL_ERR_X509_CERT_INVALID_PUBKEY |
|
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POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
|
|
|
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if( ( ret = asn1_get_mpi( p, end2, N ) ) != 0 ||
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( ret = asn1_get_mpi( p, end2, E ) ) != 0 )
|
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return( POLARSSL_ERR_X509_CERT_INVALID_PUBKEY | ret );
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|
|
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if( *p != end )
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return( POLARSSL_ERR_X509_CERT_INVALID_PUBKEY |
|
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POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
|
|
|
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return( 0 );
|
|
}
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|
|
|
static int x509_get_sig( unsigned char **p,
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unsigned char *end,
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x509_buf *sig )
|
|
{
|
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int ret, len;
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sig->tag = **p;
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|
|
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if( ( ret = asn1_get_tag( p, end, &len, ASN1_BIT_STRING ) ) != 0 )
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return( POLARSSL_ERR_X509_CERT_INVALID_SIGNATURE | ret );
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|
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if( --len < 1 || *(*p)++ != 0 )
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return( POLARSSL_ERR_X509_CERT_INVALID_SIGNATURE );
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|
|
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sig->len = len;
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sig->p = *p;
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|
|
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*p += len;
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|
|
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return( 0 );
|
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}
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|
|
|
/*
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* X.509 v2/v3 unique identifier (not parsed)
|
|
*/
|
|
static int x509_get_uid( unsigned char **p,
|
|
unsigned char *end,
|
|
x509_buf *uid, int n )
|
|
{
|
|
int ret;
|
|
|
|
if( *p == end )
|
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return( 0 );
|
|
|
|
uid->tag = **p;
|
|
|
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if( ( ret = asn1_get_tag( p, end, &uid->len,
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ASN1_CONTEXT_SPECIFIC | ASN1_CONSTRUCTED | n ) ) != 0 )
|
|
{
|
|
if( ret == POLARSSL_ERR_ASN1_UNEXPECTED_TAG )
|
|
return( 0 );
|
|
|
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return( ret );
|
|
}
|
|
|
|
uid->p = *p;
|
|
*p += uid->len;
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* X.509 v3 extensions (only BasicConstraints are parsed)
|
|
*/
|
|
static int x509_get_ext( unsigned char **p,
|
|
unsigned char *end,
|
|
x509_buf *ext,
|
|
int *ca_istrue,
|
|
int *max_pathlen )
|
|
{
|
|
int ret, len;
|
|
int is_critical = 1;
|
|
int is_cacert = 0;
|
|
unsigned char *end2;
|
|
|
|
if( *p == end )
|
|
return( 0 );
|
|
|
|
ext->tag = **p;
|
|
|
|
if( ( ret = asn1_get_tag( p, end, &ext->len,
|
|
ASN1_CONTEXT_SPECIFIC | ASN1_CONSTRUCTED | 3 ) ) != 0 )
|
|
{
|
|
if( ret == POLARSSL_ERR_ASN1_UNEXPECTED_TAG )
|
|
return( 0 );
|
|
|
|
return( ret );
|
|
}
|
|
|
|
ext->p = *p;
|
|
end = *p + ext->len;
|
|
|
|
/*
|
|
* Extensions ::= SEQUENCE SIZE (1..MAX) OF Extension
|
|
*
|
|
* Extension ::= SEQUENCE {
|
|
* extnID OBJECT IDENTIFIER,
|
|
* critical BOOLEAN DEFAULT FALSE,
|
|
* extnValue OCTET STRING }
|
|
*/
|
|
if( ( ret = asn1_get_tag( p, end, &len,
|
|
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
|
|
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS | ret );
|
|
|
|
if( end != *p + len )
|
|
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS |
|
|
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
|
|
|
|
while( *p < end )
|
|
{
|
|
if( ( ret = asn1_get_tag( p, end, &len,
|
|
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
|
|
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS | ret );
|
|
|
|
if( memcmp( *p, "\x06\x03\x55\x1D\x13", 5 ) != 0 )
|
|
{
|
|
*p += len;
|
|
continue;
|
|
}
|
|
|
|
*p += 5;
|
|
|
|
if( ( ret = asn1_get_bool( p, end, &is_critical ) ) != 0 &&
|
|
( ret != POLARSSL_ERR_ASN1_UNEXPECTED_TAG ) )
|
|
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS | ret );
|
|
|
|
if( ( ret = asn1_get_tag( p, end, &len,
|
|
ASN1_OCTET_STRING ) ) != 0 )
|
|
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS | ret );
|
|
|
|
/*
|
|
* BasicConstraints ::= SEQUENCE {
|
|
* cA BOOLEAN DEFAULT FALSE,
|
|
* pathLenConstraint INTEGER (0..MAX) OPTIONAL }
|
|
*/
|
|
end2 = *p + len;
|
|
|
|
if( ( ret = asn1_get_tag( p, end2, &len,
|
|
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
|
|
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS | ret );
|
|
|
|
if( *p == end2 )
|
|
continue;
|
|
|
|
if( ( ret = asn1_get_bool( p, end2, &is_cacert ) ) != 0 )
|
|
{
|
|
if( ret == POLARSSL_ERR_ASN1_UNEXPECTED_TAG )
|
|
ret = asn1_get_int( p, end2, &is_cacert );
|
|
|
|
if( ret != 0 )
|
|
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS | ret );
|
|
|
|
if( is_cacert != 0 )
|
|
is_cacert = 1;
|
|
}
|
|
|
|
if( *p == end2 )
|
|
continue;
|
|
|
|
if( ( ret = asn1_get_int( p, end2, max_pathlen ) ) != 0 )
|
|
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS | ret );
|
|
|
|
if( *p != end2 )
|
|
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS |
|
|
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
|
|
|
|
max_pathlen++;
|
|
}
|
|
|
|
if( *p != end )
|
|
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS |
|
|
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
|
|
|
|
*ca_istrue = is_critical & is_cacert;
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* Parse one or more certificates and add them to the chained list
|
|
*/
|
|
int x509parse_crt( x509_cert *chain, unsigned char *buf, int buflen )
|
|
{
|
|
int ret, len;
|
|
unsigned char *s1, *s2;
|
|
unsigned char *p, *end;
|
|
x509_cert *crt;
|
|
|
|
crt = chain;
|
|
|
|
while( crt->version != 0 )
|
|
crt = crt->next;
|
|
|
|
/*
|
|
* check if the certificate is encoded in base64
|
|
*/
|
|
s1 = (unsigned char *) strstr( (char *) buf,
|
|
"-----BEGIN CERTIFICATE-----" );
|
|
|
|
if( s1 != NULL )
|
|
{
|
|
s2 = (unsigned char *) strstr( (char *) buf,
|
|
"-----END CERTIFICATE-----" );
|
|
|
|
if( s2 == NULL || s2 <= s1 )
|
|
return( POLARSSL_ERR_X509_CERT_INVALID_PEM );
|
|
|
|
s1 += 27;
|
|
if( *s1 == '\r' ) s1++;
|
|
if( *s1 == '\n' ) s1++;
|
|
else return( POLARSSL_ERR_X509_CERT_INVALID_PEM );
|
|
|
|
/*
|
|
* get the DER data length and decode the buffer
|
|
*/
|
|
len = 0;
|
|
ret = base64_decode( NULL, &len, s1, s2 - s1 );
|
|
|
|
if( ret == POLARSSL_ERR_BASE64_INVALID_CHARACTER )
|
|
return( POLARSSL_ERR_X509_CERT_INVALID_PEM | ret );
|
|
|
|
if( ( p = (unsigned char *) malloc( len ) ) == NULL )
|
|
return( 1 );
|
|
|
|
if( ( ret = base64_decode( p, &len, s1, s2 - s1 ) ) != 0 )
|
|
{
|
|
free( p );
|
|
return( POLARSSL_ERR_X509_CERT_INVALID_PEM | ret );
|
|
}
|
|
|
|
/*
|
|
* update the buffer size and offset
|
|
*/
|
|
s2 += 25;
|
|
if( *s2 == '\r' ) s2++;
|
|
if( *s2 == '\n' ) s2++;
|
|
else
|
|
{
|
|
free( p );
|
|
return( POLARSSL_ERR_X509_CERT_INVALID_PEM );
|
|
}
|
|
|
|
buflen -= s2 - buf;
|
|
buf = s2;
|
|
}
|
|
else
|
|
{
|
|
/*
|
|
* nope, copy the raw DER data
|
|
*/
|
|
p = (unsigned char *) malloc( len = buflen );
|
|
|
|
if( p == NULL )
|
|
return( 1 );
|
|
|
|
memcpy( p, buf, buflen );
|
|
|
|
buflen = 0;
|
|
}
|
|
|
|
crt->raw.p = p;
|
|
crt->raw.len = len;
|
|
end = p + len;
|
|
|
|
/*
|
|
* Certificate ::= SEQUENCE {
|
|
* tbsCertificate TBSCertificate,
|
|
* signatureAlgorithm AlgorithmIdentifier,
|
|
* signatureValue BIT STRING }
|
|
*/
|
|
if( ( ret = asn1_get_tag( &p, end, &len,
|
|
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
|
|
{
|
|
x509_free( crt );
|
|
return( POLARSSL_ERR_X509_CERT_INVALID_FORMAT );
|
|
}
|
|
|
|
if( len != (int) ( end - p ) )
|
|
{
|
|
x509_free( crt );
|
|
return( POLARSSL_ERR_X509_CERT_INVALID_FORMAT |
|
|
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
|
|
}
|
|
|
|
/*
|
|
* TBSCertificate ::= SEQUENCE {
|
|
*/
|
|
crt->tbs.p = p;
|
|
|
|
if( ( ret = asn1_get_tag( &p, end, &len,
|
|
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
|
|
{
|
|
x509_free( crt );
|
|
return( POLARSSL_ERR_X509_CERT_INVALID_FORMAT | ret );
|
|
}
|
|
|
|
end = p + len;
|
|
crt->tbs.len = end - crt->tbs.p;
|
|
|
|
/*
|
|
* Version ::= INTEGER { v1(0), v2(1), v3(2) }
|
|
*
|
|
* CertificateSerialNumber ::= INTEGER
|
|
*
|
|
* signature AlgorithmIdentifier
|
|
*/
|
|
if( ( ret = x509_get_version( &p, end, &crt->version ) ) != 0 ||
|
|
( ret = x509_get_serial( &p, end, &crt->serial ) ) != 0 ||
|
|
( ret = x509_get_alg( &p, end, &crt->sig_oid1 ) ) != 0 )
|
|
{
|
|
x509_free( crt );
|
|
return( ret );
|
|
}
|
|
|
|
crt->version++;
|
|
|
|
if( crt->version > 3 )
|
|
{
|
|
x509_free( crt );
|
|
return( POLARSSL_ERR_X509_CERT_UNKNOWN_VERSION );
|
|
}
|
|
|
|
if( crt->sig_oid1.len != 9 ||
|
|
memcmp( crt->sig_oid1.p, OID_PKCS1, 8 ) != 0 )
|
|
{
|
|
x509_free( crt );
|
|
return( POLARSSL_ERR_X509_CERT_UNKNOWN_SIG_ALG );
|
|
}
|
|
|
|
if( crt->sig_oid1.p[8] < 2 ||
|
|
crt->sig_oid1.p[8] > 5 )
|
|
{
|
|
x509_free( crt );
|
|
return( POLARSSL_ERR_X509_CERT_UNKNOWN_SIG_ALG );
|
|
}
|
|
|
|
/*
|
|
* issuer Name
|
|
*/
|
|
crt->issuer_raw.p = p;
|
|
|
|
if( ( ret = asn1_get_tag( &p, end, &len,
|
|
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
|
|
{
|
|
x509_free( crt );
|
|
return( POLARSSL_ERR_X509_CERT_INVALID_FORMAT | ret );
|
|
}
|
|
|
|
if( ( ret = x509_get_name( &p, p + len, &crt->issuer ) ) != 0 )
|
|
{
|
|
x509_free( crt );
|
|
return( ret );
|
|
}
|
|
|
|
crt->issuer_raw.len = p - crt->issuer_raw.p;
|
|
|
|
/*
|
|
* Validity ::= SEQUENCE {
|
|
* notBefore Time,
|
|
* notAfter Time }
|
|
*
|
|
*/
|
|
if( ( ret = x509_get_dates( &p, end, &crt->valid_from,
|
|
&crt->valid_to ) ) != 0 )
|
|
{
|
|
x509_free( crt );
|
|
return( ret );
|
|
}
|
|
|
|
/*
|
|
* subject Name
|
|
*/
|
|
crt->subject_raw.p = p;
|
|
|
|
if( ( ret = asn1_get_tag( &p, end, &len,
|
|
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
|
|
{
|
|
x509_free( crt );
|
|
return( POLARSSL_ERR_X509_CERT_INVALID_FORMAT | ret );
|
|
}
|
|
|
|
if( ( ret = x509_get_name( &p, p + len, &crt->subject ) ) != 0 )
|
|
{
|
|
x509_free( crt );
|
|
return( ret );
|
|
}
|
|
|
|
crt->subject_raw.len = p - crt->subject_raw.p;
|
|
|
|
/*
|
|
* SubjectPublicKeyInfo ::= SEQUENCE
|
|
* algorithm AlgorithmIdentifier,
|
|
* subjectPublicKey BIT STRING }
|
|
*/
|
|
if( ( ret = asn1_get_tag( &p, end, &len,
|
|
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
|
|
{
|
|
x509_free( crt );
|
|
return( POLARSSL_ERR_X509_CERT_INVALID_FORMAT | ret );
|
|
}
|
|
|
|
if( ( ret = x509_get_pubkey( &p, p + len, &crt->pk_oid,
|
|
&crt->rsa.N, &crt->rsa.E ) ) != 0 )
|
|
{
|
|
x509_free( crt );
|
|
return( ret );
|
|
}
|
|
|
|
if( ( ret = rsa_check_pubkey( &crt->rsa ) ) != 0 )
|
|
{
|
|
x509_free( crt );
|
|
return( ret );
|
|
}
|
|
|
|
crt->rsa.len = mpi_size( &crt->rsa.N );
|
|
|
|
/*
|
|
* issuerUniqueID [1] IMPLICIT UniqueIdentifier OPTIONAL,
|
|
* -- If present, version shall be v2 or v3
|
|
* subjectUniqueID [2] IMPLICIT UniqueIdentifier OPTIONAL,
|
|
* -- If present, version shall be v2 or v3
|
|
* extensions [3] EXPLICIT Extensions OPTIONAL
|
|
* -- If present, version shall be v3
|
|
*/
|
|
if( crt->version == 2 || crt->version == 3 )
|
|
{
|
|
ret = x509_get_uid( &p, end, &crt->issuer_id, 1 );
|
|
if( ret != 0 )
|
|
{
|
|
x509_free( crt );
|
|
return( ret );
|
|
}
|
|
}
|
|
|
|
if( crt->version == 2 || crt->version == 3 )
|
|
{
|
|
ret = x509_get_uid( &p, end, &crt->subject_id, 2 );
|
|
if( ret != 0 )
|
|
{
|
|
x509_free( crt );
|
|
return( ret );
|
|
}
|
|
}
|
|
|
|
if( crt->version == 3 )
|
|
{
|
|
ret = x509_get_ext( &p, end, &crt->v3_ext,
|
|
&crt->ca_istrue, &crt->max_pathlen );
|
|
if( ret != 0 )
|
|
{
|
|
x509_free( crt );
|
|
return( ret );
|
|
}
|
|
}
|
|
|
|
if( p != end )
|
|
{
|
|
x509_free( crt );
|
|
return( POLARSSL_ERR_X509_CERT_INVALID_FORMAT |
|
|
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
|
|
}
|
|
|
|
end = crt->raw.p + crt->raw.len;
|
|
|
|
/*
|
|
* signatureAlgorithm AlgorithmIdentifier,
|
|
* signatureValue BIT STRING
|
|
*/
|
|
if( ( ret = x509_get_alg( &p, end, &crt->sig_oid2 ) ) != 0 )
|
|
{
|
|
x509_free( crt );
|
|
return( ret );
|
|
}
|
|
|
|
if( memcmp( crt->sig_oid1.p, crt->sig_oid2.p, 9 ) != 0 )
|
|
{
|
|
x509_free( crt );
|
|
return( POLARSSL_ERR_X509_CERT_SIG_MISMATCH );
|
|
}
|
|
|
|
if( ( ret = x509_get_sig( &p, end, &crt->sig ) ) != 0 )
|
|
{
|
|
x509_free( crt );
|
|
return( ret );
|
|
}
|
|
|
|
if( p != end )
|
|
{
|
|
x509_free( crt );
|
|
return( POLARSSL_ERR_X509_CERT_INVALID_FORMAT |
|
|
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
|
|
}
|
|
|
|
crt->next = (x509_cert *) malloc( sizeof( x509_cert ) );
|
|
|
|
if( crt->next == NULL )
|
|
{
|
|
x509_free( crt );
|
|
return( 1 );
|
|
}
|
|
|
|
crt = crt->next;
|
|
memset( crt, 0, sizeof( x509_cert ) );
|
|
|
|
if( buflen > 0 )
|
|
return( x509parse_crt( crt, buf, buflen ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* Load one or more certificates and add them to the chained list
|
|
*/
|
|
int x509parse_crtfile( x509_cert *chain, char *path )
|
|
{
|
|
int ret;
|
|
FILE *f;
|
|
size_t n;
|
|
unsigned char *buf;
|
|
|
|
if( ( f = fopen( path, "rb" ) ) == NULL )
|
|
return( 1 );
|
|
|
|
fseek( f, 0, SEEK_END );
|
|
n = (size_t) ftell( f );
|
|
fseek( f, 0, SEEK_SET );
|
|
|
|
if( ( buf = (unsigned char *) malloc( n + 1 ) ) == NULL )
|
|
return( 1 );
|
|
|
|
if( fread( buf, 1, n, f ) != n )
|
|
{
|
|
fclose( f );
|
|
free( buf );
|
|
return( 1 );
|
|
}
|
|
|
|
buf[n] = '\0';
|
|
|
|
ret = x509parse_crt( chain, buf, (int) n );
|
|
|
|
memset( buf, 0, n + 1 );
|
|
free( buf );
|
|
fclose( f );
|
|
|
|
return( ret );
|
|
}
|
|
|
|
#if defined(POLARSSL_DES_C)
|
|
/*
|
|
* Read a 16-byte hex string and convert it to binary
|
|
*/
|
|
static int x509_get_iv( unsigned char *s, unsigned char iv[8] )
|
|
{
|
|
int i, j, k;
|
|
|
|
memset( iv, 0, 8 );
|
|
|
|
for( i = 0; i < 16; i++, s++ )
|
|
{
|
|
if( *s >= '0' && *s <= '9' ) j = *s - '0'; else
|
|
if( *s >= 'A' && *s <= 'F' ) j = *s - '7'; else
|
|
if( *s >= 'a' && *s <= 'f' ) j = *s - 'W'; else
|
|
return( POLARSSL_ERR_X509_KEY_INVALID_ENC_IV );
|
|
|
|
k = ( ( i & 1 ) != 0 ) ? j : j << 4;
|
|
|
|
iv[i >> 1] = (unsigned char)( iv[i >> 1] | k );
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* Decrypt with 3DES-CBC, using PBKDF1 for key derivation
|
|
*/
|
|
static void x509_des3_decrypt( unsigned char des3_iv[8],
|
|
unsigned char *buf, int buflen,
|
|
unsigned char *pwd, int pwdlen )
|
|
{
|
|
md5_context md5_ctx;
|
|
des3_context des3_ctx;
|
|
unsigned char md5sum[16];
|
|
unsigned char des3_key[24];
|
|
|
|
/*
|
|
* 3DES key[ 0..15] = MD5(pwd || IV)
|
|
* key[16..23] = MD5(pwd || IV || 3DES key[ 0..15])
|
|
*/
|
|
md5_starts( &md5_ctx );
|
|
md5_update( &md5_ctx, pwd, pwdlen );
|
|
md5_update( &md5_ctx, des3_iv, 8 );
|
|
md5_finish( &md5_ctx, md5sum );
|
|
memcpy( des3_key, md5sum, 16 );
|
|
|
|
md5_starts( &md5_ctx );
|
|
md5_update( &md5_ctx, md5sum, 16 );
|
|
md5_update( &md5_ctx, pwd, pwdlen );
|
|
md5_update( &md5_ctx, des3_iv, 8 );
|
|
md5_finish( &md5_ctx, md5sum );
|
|
memcpy( des3_key + 16, md5sum, 8 );
|
|
|
|
des3_set3key_dec( &des3_ctx, des3_key );
|
|
des3_crypt_cbc( &des3_ctx, DES_DECRYPT, buflen,
|
|
des3_iv, buf, buf );
|
|
|
|
memset( &md5_ctx, 0, sizeof( md5_ctx ) );
|
|
memset( &des3_ctx, 0, sizeof( des3_ctx ) );
|
|
memset( md5sum, 0, 16 );
|
|
memset( des3_key, 0, 24 );
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Parse a private RSA key
|
|
*/
|
|
int x509parse_key( rsa_context *rsa, unsigned char *buf, int buflen,
|
|
unsigned char *pwd, int pwdlen )
|
|
{
|
|
int ret, len, enc;
|
|
unsigned char *s1, *s2;
|
|
unsigned char *p, *end;
|
|
unsigned char des3_iv[8];
|
|
|
|
s1 = (unsigned char *) strstr( (char *) buf,
|
|
"-----BEGIN RSA PRIVATE KEY-----" );
|
|
|
|
if( s1 != NULL )
|
|
{
|
|
s2 = (unsigned char *) strstr( (char *) buf,
|
|
"-----END RSA PRIVATE KEY-----" );
|
|
|
|
if( s2 == NULL || s2 <= s1 )
|
|
return( POLARSSL_ERR_X509_KEY_INVALID_PEM );
|
|
|
|
s1 += 31;
|
|
if( *s1 == '\r' ) s1++;
|
|
if( *s1 == '\n' ) s1++;
|
|
else return( POLARSSL_ERR_X509_KEY_INVALID_PEM );
|
|
|
|
enc = 0;
|
|
|
|
if( memcmp( s1, "Proc-Type: 4,ENCRYPTED", 22 ) == 0 )
|
|
{
|
|
#if defined(POLARSSL_DES_C)
|
|
enc++;
|
|
|
|
s1 += 22;
|
|
if( *s1 == '\r' ) s1++;
|
|
if( *s1 == '\n' ) s1++;
|
|
else return( POLARSSL_ERR_X509_KEY_INVALID_PEM );
|
|
|
|
if( memcmp( s1, "DEK-Info: DES-EDE3-CBC,", 23 ) != 0 )
|
|
return( POLARSSL_ERR_X509_KEY_UNKNOWN_ENC_ALG );
|
|
|
|
s1 += 23;
|
|
if( x509_get_iv( s1, des3_iv ) != 0 )
|
|
return( POLARSSL_ERR_X509_KEY_INVALID_ENC_IV );
|
|
|
|
s1 += 16;
|
|
if( *s1 == '\r' ) s1++;
|
|
if( *s1 == '\n' ) s1++;
|
|
else return( POLARSSL_ERR_X509_KEY_INVALID_PEM );
|
|
#else
|
|
return( POLARSSL_ERR_X509_FEATURE_UNAVAILABLE );
|
|
#endif
|
|
}
|
|
|
|
len = 0;
|
|
ret = base64_decode( NULL, &len, s1, s2 - s1 );
|
|
|
|
if( ret == POLARSSL_ERR_BASE64_INVALID_CHARACTER )
|
|
return( ret | POLARSSL_ERR_X509_KEY_INVALID_PEM );
|
|
|
|
if( ( buf = (unsigned char *) malloc( len ) ) == NULL )
|
|
return( 1 );
|
|
|
|
if( ( ret = base64_decode( buf, &len, s1, s2 - s1 ) ) != 0 )
|
|
{
|
|
free( buf );
|
|
return( ret | POLARSSL_ERR_X509_KEY_INVALID_PEM );
|
|
}
|
|
|
|
buflen = len;
|
|
|
|
if( enc != 0 )
|
|
{
|
|
#if defined(POLARSSL_DES_C)
|
|
if( pwd == NULL )
|
|
{
|
|
free( buf );
|
|
return( POLARSSL_ERR_X509_KEY_PASSWORD_REQUIRED );
|
|
}
|
|
|
|
x509_des3_decrypt( des3_iv, buf, buflen, pwd, pwdlen );
|
|
|
|
if( buf[0] != 0x30 || buf[1] != 0x82 ||
|
|
buf[4] != 0x02 || buf[5] != 0x01 )
|
|
{
|
|
free( buf );
|
|
return( POLARSSL_ERR_X509_KEY_PASSWORD_MISMATCH );
|
|
}
|
|
#else
|
|
return( POLARSSL_ERR_X509_FEATURE_UNAVAILABLE );
|
|
#endif
|
|
}
|
|
}
|
|
|
|
memset( rsa, 0, sizeof( rsa_context ) );
|
|
|
|
p = buf;
|
|
end = buf + buflen;
|
|
|
|
/*
|
|
* RSAPrivateKey ::= SEQUENCE {
|
|
* version Version,
|
|
* modulus INTEGER, -- n
|
|
* publicExponent INTEGER, -- e
|
|
* privateExponent INTEGER, -- d
|
|
* prime1 INTEGER, -- p
|
|
* prime2 INTEGER, -- q
|
|
* exponent1 INTEGER, -- d mod (p-1)
|
|
* exponent2 INTEGER, -- d mod (q-1)
|
|
* coefficient INTEGER, -- (inverse of q) mod p
|
|
* otherPrimeInfos OtherPrimeInfos OPTIONAL
|
|
* }
|
|
*/
|
|
if( ( ret = asn1_get_tag( &p, end, &len,
|
|
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
|
|
{
|
|
if( s1 != NULL )
|
|
free( buf );
|
|
|
|
rsa_free( rsa );
|
|
return( POLARSSL_ERR_X509_KEY_INVALID_FORMAT | ret );
|
|
}
|
|
|
|
end = p + len;
|
|
|
|
if( ( ret = asn1_get_int( &p, end, &rsa->ver ) ) != 0 )
|
|
{
|
|
if( s1 != NULL )
|
|
free( buf );
|
|
|
|
rsa_free( rsa );
|
|
return( POLARSSL_ERR_X509_KEY_INVALID_FORMAT | ret );
|
|
}
|
|
|
|
if( rsa->ver != 0 )
|
|
{
|
|
if( s1 != NULL )
|
|
free( buf );
|
|
|
|
rsa_free( rsa );
|
|
return( ret | POLARSSL_ERR_X509_KEY_INVALID_VERSION );
|
|
}
|
|
|
|
if( ( ret = asn1_get_mpi( &p, end, &rsa->N ) ) != 0 ||
|
|
( ret = asn1_get_mpi( &p, end, &rsa->E ) ) != 0 ||
|
|
( ret = asn1_get_mpi( &p, end, &rsa->D ) ) != 0 ||
|
|
( ret = asn1_get_mpi( &p, end, &rsa->P ) ) != 0 ||
|
|
( ret = asn1_get_mpi( &p, end, &rsa->Q ) ) != 0 ||
|
|
( ret = asn1_get_mpi( &p, end, &rsa->DP ) ) != 0 ||
|
|
( ret = asn1_get_mpi( &p, end, &rsa->DQ ) ) != 0 ||
|
|
( ret = asn1_get_mpi( &p, end, &rsa->QP ) ) != 0 )
|
|
{
|
|
if( s1 != NULL )
|
|
free( buf );
|
|
|
|
rsa_free( rsa );
|
|
return( ret | POLARSSL_ERR_X509_KEY_INVALID_FORMAT );
|
|
}
|
|
|
|
rsa->len = mpi_size( &rsa->N );
|
|
|
|
if( p != end )
|
|
{
|
|
if( s1 != NULL )
|
|
free( buf );
|
|
|
|
rsa_free( rsa );
|
|
return( POLARSSL_ERR_X509_KEY_INVALID_FORMAT |
|
|
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
|
|
}
|
|
|
|
if( ( ret = rsa_check_privkey( rsa ) ) != 0 )
|
|
{
|
|
if( s1 != NULL )
|
|
free( buf );
|
|
|
|
rsa_free( rsa );
|
|
return( ret );
|
|
}
|
|
|
|
if( s1 != NULL )
|
|
free( buf );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* Load and parse a private RSA key
|
|
*/
|
|
int x509parse_keyfile( rsa_context *rsa, char *path, char *pwd )
|
|
{
|
|
int ret;
|
|
FILE *f;
|
|
size_t n;
|
|
unsigned char *buf;
|
|
|
|
if( ( f = fopen( path, "rb" ) ) == NULL )
|
|
return( 1 );
|
|
|
|
fseek( f, 0, SEEK_END );
|
|
n = (size_t) ftell( f );
|
|
fseek( f, 0, SEEK_SET );
|
|
|
|
if( ( buf = (unsigned char *) malloc( n + 1 ) ) == NULL )
|
|
return( 1 );
|
|
|
|
if( fread( buf, 1, n, f ) != n )
|
|
{
|
|
fclose( f );
|
|
free( buf );
|
|
return( 1 );
|
|
}
|
|
|
|
buf[n] = '\0';
|
|
|
|
if( pwd == NULL )
|
|
ret = x509parse_key( rsa, buf, (int) n, NULL, 0 );
|
|
else
|
|
ret = x509parse_key( rsa, buf, (int) n,
|
|
(unsigned char *) pwd, strlen( pwd ) );
|
|
|
|
memset( buf, 0, n + 1 );
|
|
free( buf );
|
|
fclose( f );
|
|
|
|
return( ret );
|
|
}
|
|
|
|
#if defined _MSC_VER && !defined snprintf
|
|
#define snprintf _snprintf
|
|
#endif
|
|
|
|
/*
|
|
* Store the name in printable form into buf; no more
|
|
* than (end - buf) characters will be written
|
|
*/
|
|
int x509parse_dn_gets( char *buf, char *end, x509_name *dn )
|
|
{
|
|
int i;
|
|
unsigned char c;
|
|
x509_name *name;
|
|
char s[128], *p;
|
|
|
|
memset( s, 0, sizeof( s ) );
|
|
|
|
name = dn;
|
|
p = buf;
|
|
|
|
while( name != NULL )
|
|
{
|
|
if( name != dn )
|
|
p += snprintf( p, end - p, ", " );
|
|
|
|
if( memcmp( name->oid.p, OID_X520, 2 ) == 0 )
|
|
{
|
|
switch( name->oid.p[2] )
|
|
{
|
|
case X520_COMMON_NAME:
|
|
p += snprintf( p, end - p, "CN=" ); break;
|
|
|
|
case X520_COUNTRY:
|
|
p += snprintf( p, end - p, "C=" ); break;
|
|
|
|
case X520_LOCALITY:
|
|
p += snprintf( p, end - p, "L=" ); break;
|
|
|
|
case X520_STATE:
|
|
p += snprintf( p, end - p, "ST=" ); break;
|
|
|
|
case X520_ORGANIZATION:
|
|
p += snprintf( p, end - p, "O=" ); break;
|
|
|
|
case X520_ORG_UNIT:
|
|
p += snprintf( p, end - p, "OU=" ); break;
|
|
|
|
default:
|
|
p += snprintf( p, end - p, "0x%02X=",
|
|
name->oid.p[2] );
|
|
break;
|
|
}
|
|
}
|
|
else if( memcmp( name->oid.p, OID_PKCS9, 8 ) == 0 )
|
|
{
|
|
switch( name->oid.p[8] )
|
|
{
|
|
case PKCS9_EMAIL:
|
|
p += snprintf( p, end - p, "emailAddress=" ); break;
|
|
|
|
default:
|
|
p += snprintf( p, end - p, "0x%02X=",
|
|
name->oid.p[8] );
|
|
break;
|
|
}
|
|
}
|
|
else
|
|
p += snprintf( p, end - p, "\?\?=" );
|
|
|
|
for( i = 0; i < name->val.len; i++ )
|
|
{
|
|
if( i >= (int) sizeof( s ) - 1 )
|
|
break;
|
|
|
|
c = name->val.p[i];
|
|
if( c < 32 || c == 127 || ( c > 128 && c < 160 ) )
|
|
s[i] = '?';
|
|
else s[i] = c;
|
|
}
|
|
s[i] = '\0';
|
|
p += snprintf( p, end - p, "%s", s );
|
|
name = name->next;
|
|
}
|
|
|
|
return( p - buf );
|
|
}
|
|
|
|
/*
|
|
* Return an informational string about the
|
|
* certificate, or NULL if memory allocation failed
|
|
*/
|
|
char *x509parse_cert_info( char *prefix, x509_cert *crt )
|
|
{
|
|
int i, n;
|
|
char *p, *end;
|
|
static char buf[512];
|
|
|
|
p = buf;
|
|
end = buf + sizeof( buf ) - 1;
|
|
|
|
p += snprintf( p, end - p, "%scert. version : %d\n",
|
|
prefix, crt->version );
|
|
p += snprintf( p, end - p, "%sserial number : ",
|
|
prefix );
|
|
|
|
n = ( crt->serial.len <= 32 )
|
|
? crt->serial.len : 32;
|
|
|
|
for( i = 0; i < n; i++ )
|
|
p += snprintf( p, end - p, "%02X%s",
|
|
crt->serial.p[i], ( i < n - 1 ) ? ":" : "" );
|
|
|
|
p += snprintf( p, end - p, "\n%sissuer name : ", prefix );
|
|
p += x509parse_dn_gets( p, end, &crt->issuer );
|
|
|
|
p += snprintf( p, end - p, "\n%ssubject name : ", prefix );
|
|
p += x509parse_dn_gets( p, end, &crt->subject );
|
|
|
|
p += snprintf( p, end - p, "\n%sissued on : " \
|
|
"%04d-%02d-%02d %02d:%02d:%02d", prefix,
|
|
crt->valid_from.year, crt->valid_from.mon,
|
|
crt->valid_from.day, crt->valid_from.hour,
|
|
crt->valid_from.min, crt->valid_from.sec );
|
|
|
|
p += snprintf( p, end - p, "\n%sexpires on : " \
|
|
"%04d-%02d-%02d %02d:%02d:%02d", prefix,
|
|
crt->valid_to.year, crt->valid_to.mon,
|
|
crt->valid_to.day, crt->valid_to.hour,
|
|
crt->valid_to.min, crt->valid_to.sec );
|
|
|
|
p += snprintf( p, end - p, "\n%ssigned using : RSA+", prefix );
|
|
|
|
switch( crt->sig_oid1.p[8] )
|
|
{
|
|
case RSA_MD2 : p += snprintf( p, end - p, "MD2" ); break;
|
|
case RSA_MD4 : p += snprintf( p, end - p, "MD4" ); break;
|
|
case RSA_MD5 : p += snprintf( p, end - p, "MD5" ); break;
|
|
case RSA_SHA1: p += snprintf( p, end - p, "SHA1" ); break;
|
|
default: p += snprintf( p, end - p, "???" ); break;
|
|
}
|
|
|
|
p += snprintf( p, end - p, "\n%sRSA key size : %d bits\n", prefix,
|
|
crt->rsa.N.n * (int) sizeof( unsigned long ) * 8 );
|
|
|
|
return( buf );
|
|
}
|
|
|
|
/*
|
|
* Return 0 if the certificate is still valid, or BADCERT_EXPIRED
|
|
*/
|
|
int x509parse_expired( x509_cert *crt )
|
|
{
|
|
struct tm *lt;
|
|
time_t tt;
|
|
|
|
tt = time( NULL );
|
|
lt = localtime( &tt );
|
|
|
|
if( lt->tm_year > crt->valid_to.year - 1900 )
|
|
return( BADCERT_EXPIRED );
|
|
|
|
if( lt->tm_year == crt->valid_to.year - 1900 &&
|
|
lt->tm_mon > crt->valid_to.mon - 1 )
|
|
return( BADCERT_EXPIRED );
|
|
|
|
if( lt->tm_year == crt->valid_to.year - 1900 &&
|
|
lt->tm_mon == crt->valid_to.mon - 1 &&
|
|
lt->tm_mday > crt->valid_to.day )
|
|
return( BADCERT_EXPIRED );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
static void x509_hash( unsigned char *in, int len, int alg,
|
|
unsigned char *out )
|
|
{
|
|
switch( alg )
|
|
{
|
|
#if defined(POLARSSL_MD2_C)
|
|
case RSA_MD2 : md2( in, len, out ); break;
|
|
#endif
|
|
#if defined(POLARSSL_MD4_C)
|
|
case RSA_MD4 : md4( in, len, out ); break;
|
|
#endif
|
|
case RSA_MD5 : md5( in, len, out ); break;
|
|
case RSA_SHA1 : sha1( in, len, out ); break;
|
|
default:
|
|
memset( out, '\xFF', len );
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Verify the certificate validity
|
|
*/
|
|
int x509parse_verify( x509_cert *crt,
|
|
x509_cert *trust_ca,
|
|
char *cn, int *flags )
|
|
{
|
|
int cn_len;
|
|
int hash_id;
|
|
int pathlen;
|
|
x509_cert *cur;
|
|
x509_name *name;
|
|
unsigned char hash[20];
|
|
|
|
*flags = x509parse_expired( crt );
|
|
|
|
if( cn != NULL )
|
|
{
|
|
name = &crt->subject;
|
|
cn_len = strlen( cn );
|
|
|
|
while( name != NULL )
|
|
{
|
|
if( memcmp( name->oid.p, OID_CN, 3 ) == 0 &&
|
|
memcmp( name->val.p, cn, cn_len ) == 0 &&
|
|
name->val.len == cn_len )
|
|
break;
|
|
|
|
name = name->next;
|
|
}
|
|
|
|
if( name == NULL )
|
|
*flags |= BADCERT_CN_MISMATCH;
|
|
}
|
|
|
|
*flags |= BADCERT_NOT_TRUSTED;
|
|
|
|
/*
|
|
* Iterate upwards in the given cert chain,
|
|
* ignoring any upper cert with CA != TRUE.
|
|
*/
|
|
cur = crt->next;
|
|
|
|
pathlen = 1;
|
|
|
|
while( cur->version != 0 )
|
|
{
|
|
if( cur->ca_istrue == 0 ||
|
|
crt->issuer_raw.len != cur->subject_raw.len ||
|
|
memcmp( crt->issuer_raw.p, cur->subject_raw.p,
|
|
crt->issuer_raw.len ) != 0 )
|
|
{
|
|
cur = cur->next;
|
|
continue;
|
|
}
|
|
|
|
hash_id = crt->sig_oid1.p[8];
|
|
|
|
x509_hash( crt->tbs.p, crt->tbs.len, hash_id, hash );
|
|
|
|
if( rsa_pkcs1_verify( &cur->rsa, RSA_PUBLIC, hash_id,
|
|
0, hash, crt->sig.p ) != 0 )
|
|
return( POLARSSL_ERR_X509_CERT_VERIFY_FAILED );
|
|
|
|
pathlen++;
|
|
|
|
crt = cur;
|
|
cur = crt->next;
|
|
}
|
|
|
|
/*
|
|
* Atempt to validate topmost cert with our CA chain.
|
|
*/
|
|
while( trust_ca->version != 0 )
|
|
{
|
|
if( crt->issuer_raw.len != trust_ca->subject_raw.len ||
|
|
memcmp( crt->issuer_raw.p, trust_ca->subject_raw.p,
|
|
crt->issuer_raw.len ) != 0 )
|
|
{
|
|
trust_ca = trust_ca->next;
|
|
continue;
|
|
}
|
|
|
|
if( trust_ca->max_pathlen > 0 &&
|
|
trust_ca->max_pathlen < pathlen )
|
|
break;
|
|
|
|
hash_id = crt->sig_oid1.p[8];
|
|
|
|
x509_hash( crt->tbs.p, crt->tbs.len, hash_id, hash );
|
|
|
|
if( rsa_pkcs1_verify( &trust_ca->rsa, RSA_PUBLIC, hash_id,
|
|
0, hash, crt->sig.p ) == 0 )
|
|
{
|
|
/*
|
|
* cert. is signed by a trusted CA
|
|
*/
|
|
*flags &= ~BADCERT_NOT_TRUSTED;
|
|
break;
|
|
}
|
|
|
|
trust_ca = trust_ca->next;
|
|
}
|
|
|
|
if( *flags != 0 )
|
|
return( POLARSSL_ERR_X509_CERT_VERIFY_FAILED );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* Unallocate all certificate data
|
|
*/
|
|
void x509_free( x509_cert *crt )
|
|
{
|
|
x509_cert *cert_cur = crt;
|
|
x509_cert *cert_prv;
|
|
x509_name *name_cur;
|
|
x509_name *name_prv;
|
|
|
|
if( crt == NULL )
|
|
return;
|
|
|
|
do
|
|
{
|
|
rsa_free( &cert_cur->rsa );
|
|
|
|
name_cur = cert_cur->issuer.next;
|
|
while( name_cur != NULL )
|
|
{
|
|
name_prv = name_cur;
|
|
name_cur = name_cur->next;
|
|
memset( name_prv, 0, sizeof( x509_name ) );
|
|
free( name_prv );
|
|
}
|
|
|
|
name_cur = cert_cur->subject.next;
|
|
while( name_cur != NULL )
|
|
{
|
|
name_prv = name_cur;
|
|
name_cur = name_cur->next;
|
|
memset( name_prv, 0, sizeof( x509_name ) );
|
|
free( name_prv );
|
|
}
|
|
|
|
if( cert_cur->raw.p != NULL )
|
|
{
|
|
memset( cert_cur->raw.p, 0, cert_cur->raw.len );
|
|
free( cert_cur->raw.p );
|
|
}
|
|
|
|
cert_cur = cert_cur->next;
|
|
}
|
|
while( cert_cur != NULL );
|
|
|
|
cert_cur = crt;
|
|
do
|
|
{
|
|
cert_prv = cert_cur;
|
|
cert_cur = cert_cur->next;
|
|
|
|
memset( cert_prv, 0, sizeof( x509_cert ) );
|
|
if( cert_prv != crt )
|
|
free( cert_prv );
|
|
}
|
|
while( cert_cur != NULL );
|
|
}
|
|
|
|
#if defined(POLARSSL_SELF_TEST)
|
|
|
|
#include "polarssl/certs.h"
|
|
|
|
/*
|
|
* Checkup routine
|
|
*/
|
|
int x509_self_test( int verbose )
|
|
{
|
|
int ret, i, j;
|
|
x509_cert cacert;
|
|
x509_cert clicert;
|
|
rsa_context rsa;
|
|
|
|
if( verbose != 0 )
|
|
printf( " X.509 certificate load: " );
|
|
|
|
memset( &clicert, 0, sizeof( x509_cert ) );
|
|
|
|
ret = x509parse_crt( &clicert, (unsigned char *) test_cli_crt,
|
|
strlen( test_cli_crt ) );
|
|
if( ret != 0 )
|
|
{
|
|
if( verbose != 0 )
|
|
printf( "failed\n" );
|
|
|
|
return( ret );
|
|
}
|
|
|
|
memset( &cacert, 0, sizeof( x509_cert ) );
|
|
|
|
ret = x509parse_crt( &cacert, (unsigned char *) test_ca_crt,
|
|
strlen( test_ca_crt ) );
|
|
if( ret != 0 )
|
|
{
|
|
if( verbose != 0 )
|
|
printf( "failed\n" );
|
|
|
|
return( ret );
|
|
}
|
|
|
|
if( verbose != 0 )
|
|
printf( "passed\n X.509 private key load: " );
|
|
|
|
i = strlen( test_ca_key );
|
|
j = strlen( test_ca_pwd );
|
|
|
|
if( ( ret = x509parse_key( &rsa,
|
|
(unsigned char *) test_ca_key, i,
|
|
(unsigned char *) test_ca_pwd, j ) ) != 0 )
|
|
{
|
|
if( verbose != 0 )
|
|
printf( "failed\n" );
|
|
|
|
return( ret );
|
|
}
|
|
|
|
if( verbose != 0 )
|
|
printf( "passed\n X.509 signature verify: ");
|
|
|
|
ret = x509parse_verify( &clicert, &cacert, "Joe User", &i );
|
|
if( ret != 0 )
|
|
{
|
|
if( verbose != 0 )
|
|
printf( "failed\n" );
|
|
|
|
return( ret );
|
|
}
|
|
|
|
if( verbose != 0 )
|
|
printf( "passed\n\n" );
|
|
|
|
x509_free( &cacert );
|
|
x509_free( &clicert );
|
|
rsa_free( &rsa );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
#endif
|
|
|
|
#endif
|