184 lines
7.3 KiB
Python
184 lines
7.3 KiB
Python
import logging
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log = logging.getLogger('gajim.c.check_X509')
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try:
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import OpenSSL.SSL
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import OpenSSL.crypto
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ver = OpenSSL.__version__
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if ver < '0.12':
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raise ImportError
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from pyasn1.type import univ, constraint, char, namedtype, tag
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from pyasn1.codec.der.decoder import decode
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from common.helpers import prep, InvalidFormat
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MAX = 64
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oid_xmppaddr = '1.3.6.1.5.5.7.8.5'
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oid_dnssrv = '1.3.6.1.5.5.7.8.7'
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class DirectoryString(univ.Choice):
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componentType = namedtype.NamedTypes(
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namedtype.NamedType(
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'teletexString', char.TeletexString().subtype(
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subtypeSpec=constraint.ValueSizeConstraint(1, MAX))),
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namedtype.NamedType(
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'printableString', char.PrintableString().subtype(
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subtypeSpec=constraint.ValueSizeConstraint(1, MAX))),
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namedtype.NamedType(
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'universalString', char.UniversalString().subtype(
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subtypeSpec=constraint.ValueSizeConstraint(1, MAX))),
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namedtype.NamedType(
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'utf8String', char.UTF8String().subtype(
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subtypeSpec=constraint.ValueSizeConstraint(1, MAX))),
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namedtype.NamedType(
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'bmpString', char.BMPString().subtype(
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subtypeSpec=constraint.ValueSizeConstraint(1, MAX))),
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namedtype.NamedType(
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'ia5String', char.IA5String().subtype(
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subtypeSpec=constraint.ValueSizeConstraint(1, MAX))),
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namedtype.NamedType(
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'gString', univ.OctetString().subtype(
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subtypeSpec=constraint.ValueSizeConstraint(1, MAX))),
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)
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class AttributeValue(DirectoryString):
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pass
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class AttributeType(univ.ObjectIdentifier):
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pass
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class AttributeTypeAndValue(univ.Sequence):
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componentType = namedtype.NamedTypes(
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namedtype.NamedType('type', AttributeType()),
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namedtype.NamedType('value', AttributeValue()),
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)
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class RelativeDistinguishedName(univ.SetOf):
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componentType = AttributeTypeAndValue()
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class RDNSequence(univ.SequenceOf):
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componentType = RelativeDistinguishedName()
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class Name(univ.Choice):
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componentType = namedtype.NamedTypes(
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namedtype.NamedType('', RDNSequence()),
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)
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class GeneralName(univ.Choice):
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componentType = namedtype.NamedTypes(
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namedtype.NamedType('otherName', univ.Sequence().subtype(
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implicitTag=tag.Tag(tag.tagClassContext,
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tag.tagFormatConstructed, 0x0))),
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namedtype.NamedType('rfc822Name', char.IA5String().subtype(
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implicitTag=tag.Tag(tag.tagClassContext,
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tag.tagFormatSimple, 1))),
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namedtype.NamedType('dNSName', char.IA5String().subtype(
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implicitTag=tag.Tag(tag.tagClassContext,
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tag.tagFormatSimple, 2))),
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namedtype.NamedType('x400Address', univ.Sequence().subtype(
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implicitTag=tag.Tag(tag.tagClassContext,
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tag.tagFormatConstructed, 0x3))),
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namedtype.NamedType('directoryName', Name().subtype(
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implicitTag=tag.Tag(tag.tagClassContext,
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tag.tagFormatConstructed, 0x4))),
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namedtype.NamedType('ediPartyName', univ.Sequence().subtype(
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implicitTag=tag.Tag(tag.tagClassContext,
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tag.tagFormatConstructed, 0x5))),
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namedtype.NamedType('uniformResourceIdentifier',
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char.IA5String().subtype(
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implicitTag=tag.Tag(tag.tagClassContext,
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tag.tagFormatSimple, 6))),
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namedtype.NamedType('iPAddress', univ.OctetString().subtype(
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implicitTag=tag.Tag(tag.tagClassContext,
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tag.tagFormatSimple, 7))),
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namedtype.NamedType('registeredID', univ.ObjectIdentifier().subtype(
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implicitTag=tag.Tag(tag.tagClassContext,
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tag.tagFormatSimple, 8))),
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)
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class GeneralNames(univ.SequenceOf):
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componentType = GeneralName()
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sizeSpec = univ.SequenceOf.sizeSpec + constraint.ValueSizeConstraint(1, MAX)
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def _parse_asn1(asn1):
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obj = decode(asn1, asn1Spec=GeneralNames())[0]
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r = {}
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for o in obj:
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name = o.getName()
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if name == 'dNSName':
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if name not in r:
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r[name] = []
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r[name].append(str(o.getComponent()))
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if name == 'otherName':
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if name not in r:
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r[name] = {}
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tag = str(tuple(o.getComponent())[0])
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val = str(tuple(o.getComponent())[1])
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if tag not in r[name]:
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r[name][tag] = []
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r[name][tag].append(val)
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if name == 'uniformResourceIdentifier':
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r['uniformResourceIdentifier'] = True
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return r
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def check_certificate(cert, domain):
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cnt = cert.get_extension_count()
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if '.' in domain:
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compared_domain = domain.split('.', 1)[1]
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else:
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compared_domain = ''
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srv_domain = '_xmpp-client.' + domain
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compared_srv_domain = '_xmpp-client.' + compared_domain
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for i in range(0, cnt):
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ext = cert.get_extension(i)
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if ext.get_short_name() == b'subjectAltName':
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try:
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r = _parse_asn1(ext.get_data())
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except:
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log.error('Wrong data in certificate: subjectAltName=%s' % \
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ext.get_data())
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continue
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if 'otherName' in r:
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if oid_xmppaddr in r['otherName']:
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for host in r['otherName'][oid_xmppaddr]:
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try:
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host = prep(None, host, None)
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except InvalidFormat:
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continue
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if host == domain:
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return True
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if oid_dnssrv in r['otherName']:
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for host in r['otherName'][oid_dnssrv]:
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if host.startswith('_xmpp-client.*.'):
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if host.replace('*.', '', 1) == compared_srv_domain:
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return True
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continue
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if host == srv_domain:
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return True
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if 'dNSName' in r:
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for host in r['dNSName']:
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if host.startswith('*.'):
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if host[2:] == compared_domain:
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return True
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continue
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if host == domain:
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return True
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if r:
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return False
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break
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subject = cert.get_subject()
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if subject.commonName == domain:
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return True
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return False
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except ImportError:
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log.warning('Import of PyOpenSSL or pyasn1 failed. Cannot correctly check '
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'SSL certificate')
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def check_certificate(cert, domain):
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subject = cert.get_subject()
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if subject.commonName == domain:
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return True
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return False
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