gajim-plural/gajim/common/check_X509.py

172 lines
6.3 KiB
Python
Raw Normal View History

import logging
log = logging.getLogger('gajim.c.check_X509')
import OpenSSL.SSL
import OpenSSL.crypto
from pyasn1.type import univ, constraint, char, namedtype, tag
from pyasn1.codec.der.decoder import decode
from gajim.common.helpers import prep, InvalidFormat
MAX = 64
oid_xmppaddr = '1.3.6.1.5.5.7.8.5'
oid_dnssrv = '1.3.6.1.5.5.7.8.7'
class DirectoryString(univ.Choice):
componentType = namedtype.NamedTypes(
namedtype.NamedType(
'teletexString', char.TeletexString().subtype(
subtypeSpec=constraint.ValueSizeConstraint(1, MAX))),
namedtype.NamedType(
'printableString', char.PrintableString().subtype(
subtypeSpec=constraint.ValueSizeConstraint(1, MAX))),
namedtype.NamedType(
'universalString', char.UniversalString().subtype(
subtypeSpec=constraint.ValueSizeConstraint(1, MAX))),
namedtype.NamedType(
'utf8String', char.UTF8String().subtype(
subtypeSpec=constraint.ValueSizeConstraint(1, MAX))),
namedtype.NamedType(
'bmpString', char.BMPString().subtype(
subtypeSpec=constraint.ValueSizeConstraint(1, MAX))),
namedtype.NamedType(
'ia5String', char.IA5String().subtype(
subtypeSpec=constraint.ValueSizeConstraint(1, MAX))),
namedtype.NamedType(
'gString', univ.OctetString().subtype(
subtypeSpec=constraint.ValueSizeConstraint(1, MAX))),
)
class AttributeValue(DirectoryString):
pass
class AttributeType(univ.ObjectIdentifier):
pass
class AttributeTypeAndValue(univ.Sequence):
componentType = namedtype.NamedTypes(
namedtype.NamedType('type', AttributeType()),
namedtype.NamedType('value', AttributeValue()),
)
class RelativeDistinguishedName(univ.SetOf):
componentType = AttributeTypeAndValue()
class RDNSequence(univ.SequenceOf):
componentType = RelativeDistinguishedName()
class Name(univ.Choice):
componentType = namedtype.NamedTypes(
namedtype.NamedType('', RDNSequence()),
)
class GeneralName(univ.Choice):
componentType = namedtype.NamedTypes(
namedtype.NamedType('otherName', univ.Sequence().subtype(
implicitTag=tag.Tag(tag.tagClassContext,
tag.tagFormatConstructed, 0x0))),
namedtype.NamedType('rfc822Name', char.IA5String().subtype(
implicitTag=tag.Tag(tag.tagClassContext,
tag.tagFormatSimple, 1))),
namedtype.NamedType('dNSName', char.IA5String().subtype(
implicitTag=tag.Tag(tag.tagClassContext,
tag.tagFormatSimple, 2))),
namedtype.NamedType('x400Address', univ.Sequence().subtype(
implicitTag=tag.Tag(tag.tagClassContext,
tag.tagFormatConstructed, 0x3))),
namedtype.NamedType('directoryName', Name().subtype(
implicitTag=tag.Tag(tag.tagClassContext,
tag.tagFormatConstructed, 0x4))),
namedtype.NamedType('ediPartyName', univ.Sequence().subtype(
implicitTag=tag.Tag(tag.tagClassContext,
tag.tagFormatConstructed, 0x5))),
namedtype.NamedType('uniformResourceIdentifier',
char.IA5String().subtype(
implicitTag=tag.Tag(tag.tagClassContext,
tag.tagFormatSimple, 6))),
namedtype.NamedType('iPAddress', univ.OctetString().subtype(
implicitTag=tag.Tag(tag.tagClassContext,
tag.tagFormatSimple, 7))),
namedtype.NamedType('registeredID', univ.ObjectIdentifier().subtype(
implicitTag=tag.Tag(tag.tagClassContext,
tag.tagFormatSimple, 8))),
)
class GeneralNames(univ.SequenceOf):
componentType = GeneralName()
sizeSpec = univ.SequenceOf.sizeSpec + constraint.ValueSizeConstraint(1, MAX)
def _parse_asn1(asn1):
obj = decode(asn1, asn1Spec=GeneralNames())[0]
r = {}
for o in obj:
name = o.getName()
if name == 'dNSName':
if name not in r:
r[name] = []
r[name].append(str(o.getComponent()))
if name == 'otherName':
if name not in r:
r[name] = {}
tag = str(tuple(o.getComponent())[0])
val = str(tuple(o.getComponent())[1])
if tag not in r[name]:
r[name][tag] = []
r[name][tag].append(val)
if name == 'uniformResourceIdentifier':
r['uniformResourceIdentifier'] = True
return r
def check_certificate(cert, domain):
cnt = cert.get_extension_count()
if '.' in domain:
compared_domain = domain.split('.', 1)[1]
else:
compared_domain = ''
srv_domain = '_xmpp-client.' + domain
compared_srv_domain = '_xmpp-client.' + compared_domain
for i in range(0, cnt):
ext = cert.get_extension(i)
if ext.get_short_name() == b'subjectAltName':
try:
r = _parse_asn1(ext.get_data())
except:
log.error('Wrong data in certificate: subjectAltName=%s' % \
ext.get_data())
continue
if 'otherName' in r:
if oid_xmppaddr in r['otherName']:
for host in r['otherName'][oid_xmppaddr]:
try:
host = prep(None, host, None)
except InvalidFormat:
continue
if host == domain:
return True
if oid_dnssrv in r['otherName']:
for host in r['otherName'][oid_dnssrv]:
if host.startswith('_xmpp-client.*.'):
if host.replace('*.', '', 1) == compared_srv_domain:
return True
continue
if host == srv_domain:
return True
if 'dNSName' in r:
for host in r['dNSName']:
if host.startswith('*.'):
if host[2:] == compared_domain:
return True
continue
if host == domain:
return True
if r:
return False
break
subject = cert.get_subject()
if subject.commonName == domain:
return True
return False