use strict;
use Data::Dumper;
$Data::Dumper::Indent=1;
$Data::Dumper::Quotekeys=1;
$Data::Dumper::Useqq=1;
use Convert::ASN1 qw(:io :debug);
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
-- $Id: x509decode,v 1.1 2002/02/10 16:41:28 gbarr Exp $
-- 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 );
}