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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 = False
show_ski = False
show_aki = False
show_issuer = True
show_subject = True
cn_only = True
subjects = {}
def __init__(self, filename):
while filename.startswith("./"):
filename = filename[2:]
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.canonize(self.pow.getSubject())
self.issuer = self.canonize(self.pow.getIssuer())
if self.subject in self.subjects:
self.subjects[self.subject].append(self)
else:
self.subjects[self.subject] = [self]
def canonize(self, name):
if self.cn_only and len(name) == 1 and name[0][0] == "CN":
return name[0][1]
else:
return name
def set_node(self, node):
self.node = node
def dot(self):
label = []
if self.show_issuer:
label.append(("Issuer", self.issuer))
if self.show_subject:
label.append(("Subject", self.subject))
if self.show_file:
label.append(("File", self.filename))
if self.show_aki:
label.append(("AKI", self.aki))
if self.show_ski:
label.append(("SKI", self.ski))
print "#", repr(label)
if len(label) > 1:
print '%s [shape = record, label = "{%s}"];' % (self.node, "|".join("{%s|%s}" % (x, y) for x, y in label if y is not None))
else:
print '%s [label = "%s"];' % (self.node, label[0][1])
for issuer in self.subjects.get(self.issuer, ()):
if issuer is self:
print "# Issuer is self"
issuer = None
if issuer is not None and self.aki is not None and self.ski is not None and self.aki == self.ski:
print "# Self-signed"
issuer = None
if issuer is not None and self.aki is not None and issuer.ski is not None and self.aki != issuer.ski:
print "# AKI does not match 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, cert in enumerate(certs):
cert.set_node("cert_%d" % i)
print """\
digraph certificates {
rotate = 90;
#size = "11,8.5";
splines = true;
ratio = fill;
"""
for cert in certs:
cert.dot()
print "}"
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