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149 lines
4.5 KiB
Python
149 lines
4.5 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, 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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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_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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try:
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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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return nss.x509_alt_name(extension.value)
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finally:
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del request
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return None
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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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