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#!/usr/bin/perl
# $Id: x509decode,v 1.1 2002/02/10 16:41:28 gbarr Exp $
# (c) 2001-2002 Norbert Klasen, DAASI International GmbH. All rights reserved.
# This package is free software; you can redistribute it and/or
# modify it under the same terms as Perl itself.
#
# decode X.509 certificates
#
# varable naming
# Convert::ASN1 objects are prefixed with asn_
# variables holding binary DER content are prefixed with der_

use strict;

use Data::Dumper;
$Data::Dumper::Indent=1;
$Data::Dumper::Quotekeys=1;
$Data::Dumper::Useqq=1;

use Convert::ASN1 qw(:io :debug);

# parse ASN.1 desciptions
my $asn = Convert::ASN1->new;
$asn->prepare(<<ASN1) or die "prepare: ", $asn->error;
-- ASN.1 from RFC2459 and X.509(2001)
-- Adapted for use with Convert::ASN1

-- attribute data types --

Attribute ::= SEQUENCE {
	type			AttributeType,
	values			SET OF AttributeValue
		-- at least one value is required -- 
	}

AttributeType ::= OBJECT IDENTIFIER

AttributeValue ::= DirectoryString  --ANY 

AttributeTypeAndValue ::= SEQUENCE {
	type			AttributeType,
	value			AttributeValue
	}


-- naming data types --

Name ::= CHOICE { -- only one possibility for now 
	rdnSequence		RDNSequence 			
	}

RDNSequence ::= SEQUENCE OF RelativeDistinguishedName

DistinguishedName ::= RDNSequence

RelativeDistinguishedName ::= 
	SET OF AttributeTypeAndValue  --SET SIZE (1 .. MAX) OF


-- Directory string type --

DirectoryString ::= CHOICE {
	teletexString		TeletexString,  --(SIZE (1..MAX)),
	printableString		PrintableString,  --(SIZE (1..MAX)),
	bmpString		BMPString,  --(SIZE (1..MAX)),
	universalString		UniversalString,  --(SIZE (1..MAX)),
	utf8String		UTF8String,  --(SIZE (1..MAX)),
	ia5String		IA5String  --added for EmailAddress
	}


-- certificate and CRL specific structures begin here

Certificate ::= SEQUENCE  {
	tbsCertificate		TBSCertificate,
	signatureAlgorithm	AlgorithmIdentifier,
	signature		BIT STRING
	}

TBSCertificate  ::=  SEQUENCE  {
	version		    [0] EXPLICIT Version OPTIONAL,  --DEFAULT v1
	serialNumber		CertificateSerialNumber,
	signature		AlgorithmIdentifier,
	issuer			Name,
	validity		Validity,
	subject			Name,
	subjectPublicKeyInfo	SubjectPublicKeyInfo,
	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
	}

Version ::= INTEGER  --{  v1(0), v2(1), v3(2)  }

CertificateSerialNumber ::= INTEGER

Validity ::= SEQUENCE {
	notBefore		Time,
	notAfter		Time
	}

Time ::= CHOICE {
	utcTime			UTCTime,
	generalTime		GeneralizedTime
	}

UniqueIdentifier ::= BIT STRING

SubjectPublicKeyInfo ::= SEQUENCE {
	algorithm		AlgorithmIdentifier,
	subjectPublicKey	BIT STRING
	}

Extensions ::= SEQUENCE OF Extension  --SIZE (1..MAX) OF Extension

Extension ::= SEQUENCE {
	extnID			OBJECT IDENTIFIER,
	critical		BOOLEAN OPTIONAL,  --DEFAULT FALSE,
	extnValue		OCTET STRING
	}

AlgorithmIdentifier ::= SEQUENCE {
	algorithm		OBJECT IDENTIFIER,
	parameters		ANY
	}


--extensions

AuthorityKeyIdentifier ::= SEQUENCE {
      keyIdentifier             [0] KeyIdentifier            OPTIONAL,
      authorityCertIssuer       [1] GeneralNames             OPTIONAL,
      authorityCertSerialNumber [2] CertificateSerialNumber  OPTIONAL }
    -- authorityCertIssuer and authorityCertSerialNumber shall both
    -- be present or both be absent

KeyIdentifier ::= OCTET STRING

SubjectKeyIdentifier ::= KeyIdentifier


-- key usage extension OID and syntax
-- id-ce-keyUsage OBJECT IDENTIFIER ::=  { id-ce 15 }

KeyUsage ::= BIT STRING --{
--      digitalSignature        (0),
--      nonRepudiation          (1),
--      keyEncipherment         (2),
--      dataEncipherment        (3),
--      keyAgreement            (4),
--      keyCertSign             (5),
--      cRLSign                 (6),
--      encipherOnly            (7),
--      decipherOnly            (8) }


-- private key usage period extension OID and syntax
-- id-ce-privateKeyUsagePeriod OBJECT IDENTIFIER ::=  { id-ce 16 }

PrivateKeyUsagePeriod ::= SEQUENCE {
     notBefore       [0]     GeneralizedTime OPTIONAL,
     notAfter        [1]     GeneralizedTime OPTIONAL }
     -- either notBefore or notAfter shall be present


-- certificate policies extension OID and syntax
-- id-ce-certificatePolicies OBJECT IDENTIFIER ::=  { id-ce 32 }

CertificatePolicies ::= SEQUENCE OF PolicyInformation

PolicyInformation ::= SEQUENCE {
     policyIdentifier   CertPolicyId,
     policyQualifiers   SEQUENCE OF
             PolicyQualifierInfo } --OPTIONAL }

CertPolicyId ::= OBJECT IDENTIFIER

PolicyQualifierInfo ::= SEQUENCE {
       policyQualifierId  PolicyQualifierId,
       qualifier        ANY } --DEFINED BY policyQualifierId }

-- Implementations that recognize additional policy qualifiers shall
-- augment the following definition for PolicyQualifierId

PolicyQualifierId ::=
     OBJECT IDENTIFIER --( id-qt-cps | id-qt-unotice )

-- CPS pointer qualifier

CPSuri ::= IA5String

-- user notice qualifier

UserNotice ::= SEQUENCE {
     noticeRef        NoticeReference OPTIONAL,
     explicitText     DisplayText OPTIONAL}

NoticeReference ::= SEQUENCE {
     organization     DisplayText,
     noticeNumbers    SEQUENCE OF INTEGER }

DisplayText ::= CHOICE {
     visibleString    VisibleString  ,
     bmpString        BMPString      ,
     utf8String       UTF8String      }


-- policy mapping extension OID and syntax
-- id-ce-policyMappings OBJECT IDENTIFIER ::=  { id-ce 33 }

PolicyMappings ::= SEQUENCE OF SEQUENCE {
     issuerDomainPolicy      CertPolicyId,
     subjectDomainPolicy     CertPolicyId }


-- subject alternative name extension OID and syntax
-- id-ce-subjectAltName OBJECT IDENTIFIER ::=  { id-ce 17 }

SubjectAltName ::= GeneralNames

GeneralNames ::= SEQUENCE OF GeneralName

GeneralName ::= CHOICE {
     otherName                       [0]     AnotherName,
     rfc822Name                      [1]     IA5String,
     dNSName                         [2]     IA5String,
     x400Address                     [3]     ANY, --ORAddress,
     directoryName                   [4]     Name,
     ediPartyName                    [5]     EDIPartyName,
     uniformResourceIdentifier       [6]     IA5String,
     iPAddress                       [7]     OCTET STRING,
     registeredID                    [8]     OBJECT IDENTIFIER }

-- AnotherName replaces OTHER-NAME ::= TYPE-IDENTIFIER, as
-- TYPE-IDENTIFIER is not supported in the '88 ASN.1 syntax

AnotherName ::= SEQUENCE {
     type    OBJECT IDENTIFIER,
     value      [0] EXPLICIT ANY } --DEFINED BY type-id }

EDIPartyName ::= SEQUENCE {
     nameAssigner            [0]     DirectoryString OPTIONAL,
     partyName               [1]     DirectoryString }


-- issuer alternative name extension OID and syntax
-- id-ce-issuerAltName OBJECT IDENTIFIER ::=  { id-ce 18 }

IssuerAltName ::= GeneralNames


-- id-ce-subjectDirectoryAttributes OBJECT IDENTIFIER ::=  { id-ce 9 }

SubjectDirectoryAttributes ::= SEQUENCE OF Attribute


-- basic constraints extension OID and syntax
-- id-ce-basicConstraints OBJECT IDENTIFIER ::=  { id-ce 19 }

BasicConstraints ::= SEQUENCE {
     cA                      BOOLEAN OPTIONAL, --DEFAULT FALSE,
     pathLenConstraint       INTEGER OPTIONAL }


-- name constraints extension OID and syntax
-- id-ce-nameConstraints OBJECT IDENTIFIER ::=  { id-ce 30 }

NameConstraints ::= SEQUENCE {
     permittedSubtrees       [0]     GeneralSubtrees OPTIONAL,
     excludedSubtrees        [1]     GeneralSubtrees OPTIONAL }

GeneralSubtrees ::= SEQUENCE OF GeneralSubtree

GeneralSubtree ::= SEQUENCE {
     base                    GeneralName,
     minimum         [0]     BaseDistance OPTIONAL, --DEFAULT 0,
     maximum         [1]     BaseDistance OPTIONAL }

BaseDistance ::= INTEGER 


-- policy constraints extension OID and syntax
-- id-ce-policyConstraints OBJECT IDENTIFIER ::=  { id-ce 36 }

PolicyConstraints ::= SEQUENCE {
     requireExplicitPolicy           [0] SkipCerts OPTIONAL,
     inhibitPolicyMapping            [1] SkipCerts OPTIONAL }

SkipCerts ::= INTEGER 


-- CRL distribution points extension OID and syntax
-- id-ce-cRLDistributionPoints     OBJECT IDENTIFIER  ::=  {id-ce 31}

cRLDistributionPoints  ::= SEQUENCE OF DistributionPoint

DistributionPoint ::= SEQUENCE {
     distributionPoint       [0]     DistributionPointName OPTIONAL,
     reasons                 [1]     ReasonFlags OPTIONAL,
     cRLIssuer               [2]     GeneralNames OPTIONAL }

DistributionPointName ::= CHOICE {
     fullName                [0]     GeneralNames,
     nameRelativeToCRLIssuer [1]     RelativeDistinguishedName }

ReasonFlags ::= BIT STRING --{
--     unused                  (0),
--     keyCompromise           (1),
--     cACompromise            (2),
--     affiliationChanged      (3),
--     superseded              (4),
--     cessationOfOperation    (5),
--     certificateHold         (6),
--     privilegeWithdrawn      (7),
--     aACompromise            (8) }


-- extended key usage extension OID and syntax
-- id-ce-extKeyUsage OBJECT IDENTIFIER ::= {id-ce 37}

ExtKeyUsageSyntax ::= SEQUENCE OF KeyPurposeId

KeyPurposeId ::= OBJECT IDENTIFIER

-- extended key purpose OIDs
-- id-kp-serverAuth      OBJECT IDENTIFIER ::= { id-kp 1 }
-- id-kp-clientAuth      OBJECT IDENTIFIER ::= { id-kp 2 }
-- id-kp-codeSigning     OBJECT IDENTIFIER ::= { id-kp 3 }
-- id-kp-emailProtection OBJECT IDENTIFIER ::= { id-kp 4 }
-- id-kp-ipsecEndSystem  OBJECT IDENTIFIER ::= { id-kp 5 }
-- id-kp-ipsecTunnel     OBJECT IDENTIFIER ::= { id-kp 6 }
-- id-kp-ipsecUser       OBJECT IDENTIFIER ::= { id-kp 7 }
-- id-kp-timeStamping    OBJECT IDENTIFIER ::= { id-kp 8 }
ASN1

# decoders for basic types
my $asn_BitString = Convert::ASN1->new();
$asn_BitString->prepare("bitString BIT STRING");
 
my $asn_OctetString = Convert::ASN1->new();
$asn_OctetString->prepare("octetString OCTET STRING");

# decoders for extensions
my %extnoid2asn = (
	'2.5.29.9' => $asn->find('SubjectDirectoryAttributes'),
	'2.5.29.14' => $asn_OctetString, #'SubjectKeyIdentifier',
	'2.5.29.15' => $asn_BitString, #'keyUsage',
	'2.5.29.16' => $asn->find('PrivateKeyUsagePeriod'),
	'2.5.29.17' => $asn->find('SubjectAltName'),
	'2.5.29.18' => $asn->find('IssuerAltName'),
	'2.5.29.19' => $asn->find('BasicConstraints'),
#	'2.5.29.20' => 'cRLNumber',
#	'2.5.29.21' => 'cRLReasons',
#	'2.5.29.23' => 'holdInstructionCode',
#	'2.5.29.24' => 'invalidityDate',
#	'2.5.29.27' => 'deltaCRLIndicator',
#	'2.5.29.28' => 'issuingDistributionPoint',
#	'2.5.29.29' => 'certificateIssuer',
	'2.5.29.30' => $asn->find('NameConstraints'),
	'2.5.29.31' => $asn->find('cRLDistributionPoints'),
	'2.5.29.32' => $asn->find('CertificatePolicies'),
	'2.5.29.33' => $asn->find('PolicyMappings'),
	'2.5.29.35' => $asn->find('AuthorityKeyIdentifier'),
	'2.5.29.36' => $asn->find('PolicyConstraints'),
	'2.5.29.37' => $asn->find('ExtKeyUsageSyntax'),
#	'2.5.29.40' => 'cRLStreamIdentifier',
#	'2.5.29.44' => 'cRLScope',
#	'2.5.29.45' => 'statusReferrals',
#	'2.5.29.46' => 'freshestCRL',
#	'2.5.29.47' => 'orderedList',
#	'2.5.29.51' => 'baseUpdateTime',
#	'2.5.29.53' => 'deltaInfo',
#	'2.5.29.54' => 'inhibitAnyPolicy',
# netscape-cert-extensions
	'2.16.840.1.113730.1.1' => $asn_BitString, # netscape-cert-type 
	'2.16.840.1.113730.1.2' => $asn->find('DirectoryString'), # netscape-base-url 
	'2.16.840.1.113730.1.3' => $asn->find('DirectoryString'), # netscape-revocation-url 
	'2.16.840.1.113730.1.4' => $asn->find('DirectoryString'), # netscape-ca-revocation-url 
	'2.16.840.1.113730.1.7' => $asn->find('DirectoryString'), # netscape-cert-renewal-url
	'2.16.840.1.113730.1.8' => $asn->find('DirectoryString'), # netscape-ca-policy-url
	'2.16.840.1.113730.1.12' => $asn->find('DirectoryString'), # netscape-ssl-server-name
	'2.16.840.1.113730.1.13' => $asn->find('DirectoryString'), # netscape-comment
);

my $asn_cert = $asn->find('Certificate');

while ( my $filename = shift ) {
	my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,
		$atime,$mtime,$ctime,$blksize,$blocks) = stat $filename;
	open FILE, "<$filename" or die "no such file";
	binmode FILE;
	my $der_cert;
	read FILE, $der_cert, $size;
	close FILE;
	decodeCert( $der_cert );
}

sub decodeCert() {
	my $der_cert = shift;
	#asn_dump( $der_cert );

	my $cert = $asn_cert->decode($der_cert) or die $asn_cert->error;
	
	#extensions
	foreach my $extension ( @{$cert->{'tbsCertificate'}->{'extensions'}} ) {
		#print "extension: ", $oid2extension{$extension->{'extnID'}}, "\n";
		if ( exists $extnoid2asn{$extension->{'extnID'}} ) {
			$extension->{'extnValue'} = ($extnoid2asn{$extension->{'extnID'}})->decode( $extension->{'extnValue'} );
		} else {
			print STDERR "unknown ", $extension->{'critical'} ? "critical " : "", "extension: ", $extension->{'extnID'}, "\n";
			asn_dump( $extension->{'extnValue'} );
		}
	}
	
	print Dumper( $cert );
}