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e92f25bd50
A bug in python-nss causes an error to be thrown when converting an unrecognised OID to a string. If cert-request receives a PKCS #10 CSR with an unknown extension, the error is thrown. Work around this error by first checking if the OID is recognised and, if it is not, using a different method to obtain its string representation. Once the python-nss bug is fixed, this workaround should be reverted. https://bugzilla.redhat.com/show_bug.cgi?id=1246729 Reviewed-By: Martin Babinsky <mbabinsk@redhat.com>
263 lines
8.9 KiB
Python
263 lines
8.9 KiB
Python
# Authors:
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# Rob Crittenden <rcritten@redhat.com>
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#
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# Copyright (C) 2010 Red Hat
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# see file 'COPYING' for use and warranty information
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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 3 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
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import os
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import sys
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import base64
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import nss.nss as nss
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from pyasn1.type import univ, char, namedtype, tag
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from pyasn1.codec.der import decoder
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from ipapython import ipautil
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from ipalib import api
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PEM = 0
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DER = 1
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SAN_DNSNAME = 'DNS name'
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SAN_RFC822NAME = 'RFC822 Name'
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SAN_OTHERNAME_UPN = 'Other Name (OID.1.3.6.1.4.1.311.20.2.3)'
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SAN_OTHERNAME_KRB5PRINCIPALNAME = 'Other Name (OID.1.3.6.1.5.2.2)'
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def get_subject(csr, datatype=PEM):
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"""
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Given a CSR return the subject value.
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This returns an nss.DN object.
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"""
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request = load_certificate_request(csr, datatype)
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try:
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return request.subject
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finally:
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del request
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def get_extensions(csr, datatype=PEM):
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"""
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Given a CSR return OIDs of certificate extensions.
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The return value is a tuple of strings
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"""
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request = load_certificate_request(csr, datatype)
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# Work around a bug in python-nss where nss.oid_dotted_decimal
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# errors on unrecognised OIDs
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#
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# https://bugzilla.redhat.com/show_bug.cgi?id=1246729
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#
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def get_prefixed_oid_str(ext):
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"""Returns a string like 'OID.1.2...'."""
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if ext.oid_tag == 0:
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return repr(ext)
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else:
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return nss.oid_dotted_decimal(ext.oid)
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return tuple(get_prefixed_oid_str(ext)[4:]
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for ext in request.extensions)
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class _PrincipalName(univ.Sequence):
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componentType = namedtype.NamedTypes(
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namedtype.NamedType('name-type', univ.Integer().subtype(
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explicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 0))
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),
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namedtype.NamedType('name-string', univ.SequenceOf(char.GeneralString()).subtype(
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explicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 1))
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),
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)
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class _KRB5PrincipalName(univ.Sequence):
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componentType = namedtype.NamedTypes(
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namedtype.NamedType('realm', char.GeneralString().subtype(
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explicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 0))
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),
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namedtype.NamedType('principalName', _PrincipalName().subtype(
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explicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 1))
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),
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)
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def _decode_krb5principalname(data):
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principal = decoder.decode(data, asn1Spec=_KRB5PrincipalName())[0]
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realm = (str(principal['realm']).replace('\\', '\\\\')
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.replace('@', '\\@'))
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name = principal['principalName']['name-string']
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name = '/'.join(str(n).replace('\\', '\\\\')
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.replace('/', '\\/')
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.replace('@', '\\@') for n in name)
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name = '%s@%s' % (name, realm)
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return name
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class _AnotherName(univ.Sequence):
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componentType = namedtype.NamedTypes(
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namedtype.NamedType('type-id', univ.ObjectIdentifier()),
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namedtype.NamedType('value', univ.Any().subtype(
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explicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 0))
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),
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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', _AnotherName().subtype(
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implicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 0))
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),
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namedtype.NamedType('rfc822Name', char.IA5String().subtype(
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implicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 1))
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),
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namedtype.NamedType('dNSName', char.IA5String().subtype(
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implicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 2))
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),
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namedtype.NamedType('x400Address', univ.Sequence().subtype(
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implicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 3))
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),
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namedtype.NamedType('directoryName', univ.Choice().subtype(
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implicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 4))
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),
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namedtype.NamedType('ediPartyName', univ.Sequence().subtype(
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implicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 5))
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),
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namedtype.NamedType('uniformResourceIdentifier', char.IA5String().subtype(
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implicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 6))
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),
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namedtype.NamedType('iPAddress', univ.OctetString().subtype(
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implicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 7))
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),
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namedtype.NamedType('registeredID', univ.ObjectIdentifier().subtype(
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implicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 8))
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),
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)
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class _SubjectAltName(univ.SequenceOf):
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componentType = _GeneralName()
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def get_subjectaltname(csr, datatype=PEM):
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"""
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Given a CSR return the subjectaltname value, if any.
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The return value is a tuple of strings or None
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"""
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request = load_certificate_request(csr, datatype)
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for extension in request.extensions:
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if extension.oid_tag == nss.SEC_OID_X509_SUBJECT_ALT_NAME:
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break
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else:
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return None
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del request
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nss_names = nss.x509_alt_name(extension.value, nss.AsObject)
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asn1_names = decoder.decode(extension.value.data,
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asn1Spec=_SubjectAltName())[0]
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names = []
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for nss_name, asn1_name in zip(nss_names, asn1_names):
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name_type = nss_name.type_string
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if name_type == SAN_OTHERNAME_KRB5PRINCIPALNAME:
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name = _decode_krb5principalname(asn1_name['otherName']['value'])
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else:
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name = nss_name.name
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names.append((name_type, name))
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return tuple(names)
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# Unfortunately, NSS can only parse the extension request attribute, so
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# we have to parse friendly name ourselves (see RFC 2986)
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class _Attribute(univ.Sequence):
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componentType = namedtype.NamedTypes(
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namedtype.NamedType('type', univ.ObjectIdentifier()),
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namedtype.NamedType('values', univ.Set()),
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)
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class _Attributes(univ.SetOf):
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componentType = _Attribute()
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class _CertificationRequestInfo(univ.Sequence):
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componentType = namedtype.NamedTypes(
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namedtype.NamedType('version', univ.Integer()),
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namedtype.NamedType('subject', univ.Sequence()),
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namedtype.NamedType('subjectPublicKeyInfo', univ.Sequence()),
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namedtype.OptionalNamedType('attributes', _Attributes().subtype(
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implicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 0)))
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)
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class _CertificationRequest(univ.Sequence):
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componentType = namedtype.NamedTypes(
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namedtype.NamedType('certificationRequestInfo',
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_CertificationRequestInfo()),
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namedtype.NamedType('signatureAlgorithm', univ.Sequence()),
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namedtype.NamedType('signatureValue', univ.BitString()),
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)
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_FRIENDLYNAME = univ.ObjectIdentifier('1.2.840.113549.1.9.20')
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def get_friendlyname(csr, datatype=PEM):
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"""
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Given a CSR return the value of the friendlyname attribute, if any.
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The return value is a string.
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"""
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if datatype == PEM:
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csr = strip_header(csr)
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csr = base64.b64decode(csr)
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csr = decoder.decode(csr, asn1Spec=_CertificationRequest())[0]
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for attribute in csr['certificationRequestInfo']['attributes']:
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if attribute['type'] == _FRIENDLYNAME:
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return unicode(attribute['values'][0])
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return None
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def strip_header(csr):
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"""
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Remove the header and footer from a CSR.
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"""
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headerlen = 40
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s = csr.find("-----BEGIN NEW CERTIFICATE REQUEST-----")
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if s == -1:
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headerlen = 36
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s = csr.find("-----BEGIN CERTIFICATE REQUEST-----")
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if s >= 0:
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e = csr.find("-----END")
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csr = csr[s+headerlen:e]
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return csr
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def load_certificate_request(csr, datatype=PEM):
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"""
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Given a base64-encoded certificate request, with or without the
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header/footer, return a request object.
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"""
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if datatype == PEM:
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csr = strip_header(csr)
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csr = base64.b64decode(csr)
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# A fail-safe so we can always read a CSR. python-nss/NSS will segfault
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# otherwise
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if not nss.nss_is_initialized():
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nss.nss_init_nodb()
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return nss.CertificateRequest(csr)
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if __name__ == '__main__':
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nss.nss_init_nodb()
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# Read PEM request from stdin and print out its components
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csrlines = sys.stdin.readlines()
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csr = ''.join(csrlines)
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print load_certificate_request(csr)
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print get_subject(csr)
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print get_subjectaltname(csr)
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print get_friendlyname(csr)
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