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# $Id$
# Copyright (C) 2007--2008 American Registry for Internet Numbers ("ARIN")
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND ARIN DISCLAIMS ALL WARRANTIES WITH
# REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
# AND FITNESS. IN NO EVENT SHALL ARIN BE LIABLE FOR ANY SPECIAL, DIRECT,
# INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
# LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
# OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
# PERFORMANCE OF THIS SOFTWARE.
"""Cross-certification tool to issue a new certificate based on an old
one that was issued by somebody else. The point of the exercise is to
end up with a valid certificate in our own BPKI which has the same
subject name and subject public key as the one we're replacing.
Much of this code lifted from rpki.x509.X509.issue(), but this is a
sufficiently different purpose that it's probably not worth
refactoring.
Usage: python cross-certify.py { -i | --in } input_cert
{ -c | --ca } issuing_cert
{ -k | --key } issuing_cert_key
{ -s | --serial } serial_filename
[ { -h | --help } ]
[ { -o | --out } filename (default: stdout) ]
[ { -l | --lifetime } timedelta (default: 30 days) ]
"""
import os, time, getopt, sys, POW
import rpki.x509, rpki.sundial
os.environ["TZ"] = "UTC"
time.tzset()
def usage(code):
print __doc__
sys.exit(code)
output = None
lifetime = rpki.sundial.timedelta(days = 30)
opts,argv = getopt.getopt(sys.argv[1:], "h?i:o:c:k:s:l:",
["help", "in=", "out=", "ca=", "key=", "serial=", "lifetime="])
for o,a in opts:
if o in ("-h", "--help", "-?"):
usage(0)
elif o in ("-i", "--in"):
child = rpki.x509.X509(Auto_file = a)
elif o in ("-o", "--out"):
output = a
elif o in ("-c", "--ca"):
parent = rpki.x509.X509(Auto_file = a)
elif o in ("-k", "--key"):
keypair = rpki.x509.RSA(Auto_file = a)
elif o in ("-s", "--serial"):
serial_file = a
elif o in ("-l", "--lifetime"):
lifetime = rpki.sundial.timedelta.parse(a)
if argv:
usage(1)
now = rpki.sundial.now()
notAfter = now + lifetime
try:
f = open(serial_file, "r")
serial = f.read()
f.close()
serial = int(serial.splitlines()[0], 16)
except IOError:
serial = 1
x = POW.pkix.Certificate()
x.setVersion(2)
x.setSerial(serial)
x.setIssuer(parent.get_POWpkix().getSubject())
x.setSubject(child.get_POWpkix().getSubject())
x.setNotBefore(now.toASN1tuple())
x.setNotAfter(notAfter.toASN1tuple())
x.tbs.subjectPublicKeyInfo.set(child.get_POWpkix().tbs.subjectPublicKeyInfo.get())
x.setExtensions(((rpki.oids.name2oid["subjectKeyIdentifier"], False,
child.get_SKI()),
(rpki.oids.name2oid["authorityKeyIdentifier"], False,
(parent.get_SKI(), (), None)),
(rpki.oids.name2oid["basicConstraints"], True,
(1, 0))))
x.sign(keypair.get_POW(), POW.SHA256_DIGEST)
cert = rpki.x509.X509(POWpkix = x)
f = open(serial_file, "w")
f.write("%02x\n" % (serial + 1))
f.close()
if output is None:
print cert.get_PEM()
else:
f = open(output, "w")
f.write(cert.get_PEM())
f.close()
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