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# $Id$
"""
Generate .dot description of a certificate tree.
"""
import POW, sys, glob, os
class x509(object):
ski = None
aki = None
show_file = True
show_ski = False
show_aki = False
def __init__(self, filename):
self.filename = filename
f = open(filename, "rb")
text = f.read()
f.close()
if text.find("-----BEGIN") >= 0:
self.pow = POW.pemRead(POW.X509_CERTIFICATE, text)
else:
self.pow = POW.derRead(POW.X509_CERTIFICATE, text)
self.extensions = dict((e[0], e[2]) for e in (self.pow.getExtension(i) for i in xrange(self.pow.countExtensions())))
if "subjectKeyIdentifier" in self.extensions:
self.ski = ":".join(["%02X" % ord(i) for i in self.extensions.get("subjectKeyIdentifier")[1:]])
if "authorityKeyIdentifier" in self.extensions:
self.aki = ":".join(["%02X" % ord(i) for i in self.extensions.get("authorityKeyIdentifier")[3:]])
self.subject = self.pow.getSubject()
self.issuer = self.pow.getIssuer()
def set_node(self, node):
self.node = node
def dot(self):
s = '%s [shape = record, label = "{Issuer %s|Subject %s' % (self.node, self.issuer, self.subject)
if self.show_file:
s += '|File %s' % self.filename
if self.show_aki:
s += '|AKI %s' % self.aki
if self.show_ski:
s += '|SKI %s' % self.ski
s += '}"];'
print s
issuer = subjects.get(self.issuer)
if issuer is self:
issuer = None
if issuer is not None and self.aki is not None and issuer.ski is not None and self.aki != issuer.ski:
issuer = None
if issuer is not None:
print "%s -> %s;" % (issuer.node, self.node)
print
certs = []
for topdir in sys.argv[1:] or ["."]:
for dirpath, dirnames, filenames in os.walk(topdir):
certs += [x509(dirpath + "/" + filename) for filename in filenames if filename.endswith(".cer")]
for i in xrange(len(certs)):
certs[i].set_node("cert_%d" % i)
subjects = dict((x.subject, x) for x in certs)
print """\
digraph certificates {
rotate = 90; size = "11,8.5";
splines = true;
ratio = fill;
"""
for cert in certs:
cert.dot()
print "}"
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