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84 lines
2.4 KiB
Python
84 lines
2.4 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
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation; version 2 only
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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, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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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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def get_subjectaltname(request):
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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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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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return None
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def get_subject(request):
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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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return request.subject
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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):
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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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csr = strip_header(csr)
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substrate = 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(substrate)
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def subject_names(csr):
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if not nss.nss_is_initialized():
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nss.nss_init_nodb()
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csr = load_certificate_request(csr)
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sans = get_subjectaltname(csr)
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if not sans: sans = []
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return [x.split("=")[1] for x in [f for f in str(get_subject(csr)).split(",") if f[:3] == "CN="]] + list(sans)
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