Initial version of cross certification tool. Not quite working yet,

POW.pkix apparently has trouble with some kinds of subject names.

svn path=/rpkid/cross-certify.py; revision=1752

1 files changed, 99 insertions, 0 deletions

diff --git a/rpkid/cross-certify.py b/rpkid/cross-certify.py
new file mode 100644
index 00000000..20044f18
--- /dev/null
+++ b/rpkid/cross-certify.py
@@ -0,0 +1,99 @@
+# $Id$
+
+# 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_number
+                               [ { -h | --help } ]
+                               [ { -o | --out  } output_filename ]
+"""
+
+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
+
+# debugging only
+
+if True:
+  child   = rpki.x509.X509(Auto_file = "APNIC-CMS-CERT.cer")
+  parent  = rpki.x509.X509(Auto_file = "ISC-SELF-1.cer")
+  keypair = rpki.x509.RSA(Auto_file  = "ISC-SELF-1.key")
+  serial  = 99
+
+opts,argv = getopt.getopt(sys.argv[1:], "h?i:o:c:k:s:",
+                          ["help", "in", "out", "ca", "key", "serial"])
+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 = int(a)
+if argv:
+  usage(1)
+
+now = rpki.sundial.now()
+notAfter = now + rpki.sundial.timedelta(days = 30)
+
+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, None))))
+x.sign(keypair.get_POW(), POW.SHA256_DIGEST)
+
+cert = rpki.x509.X509(POWpkix = x)
+
+if output is None:
+  print cert.get_PEM()
+else:
+  f = open(output, "w")
+  f.write(cert.get_PEM())
+  f.close()
+