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collect statistics about found certificates

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Hubert Kario 2014-07-25 17:49:44 +02:00 committed by Hubert Kario
parent ab8b794557
commit 68577f7918
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#!/usr/bin/env python
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
# Author: Hubert Kario - 2014
from __future__ import division
path = "./results/"
ca_certs_path = "./ca_files"
certs_path = "./certs"
""" only root CAs, no cached intermediate certs """
trust_path = "./ca_trusted"
import json
import sys
from collections import defaultdict
import os
import re
import subprocess
from OpenSSL import crypto
from M2Crypto import X509, EVP
from m2ext import _m2ext
from m2ext import SSL
import glob
from pprint import pprint
# override m2ext implementation so that it is possible to provide additional
# certificates to be used during verification. Requires m2ext with a small fix
# from https://github.com/tomato42/m2ext/tree/extended_ctx_init
class Context(SSL.Context):
def validate_certificate(self, cert, chain=None):
"""
Validate a certificate using this SSL Context
"""
if chain:
ptr = chain._ptr()
else:
ptr = None
store_ctx = X509.X509_Store_Context(_m2ext.x509_store_ctx_new(), _pyfree=1)
_m2ext.x509_store_ctx_init(store_ctx.ctx,
self.get_cert_store().store,
cert.x509, ptr)
rc = _m2ext.x509_verify_cert(store_ctx.ctx)
if rc < 0:
raise SSL.SSLError("Empty context")
return rc != 0
invocations = defaultdict(int)
total = 0
hosts = 0
chains = defaultdict(int)
chain_len = defaultdict(int)
keysize = defaultdict(int)
root_CA = defaultdict(int)
sig_alg = defaultdict(int)
intermediate_CA = defaultdict(int)
subject_hashes = {}
issuer_hashes = {}
def get_cert_subject_name(cert):
subject = cert.get_subject()
commonName = None
organization = None
for elem,val in subject.get_components():
if elem == "CN" and commonName is None:
commonName = val
if elem == "O" and organization is None:
organization = val
s_hash = "(" + ("%0.8X" % subject.hash()).lower() + ") "
if commonName is not None:
return s_hash + commonName
elif organization is not None:
return s_hash + organization
else:
return s_hash
def get_cert_hashes(path):
if path in subject_hashes:
return subject_hashes[path], issuer_hashes[path]
with open(path) as srv_c_f:
srv_c_pem = srv_c_f.read()
srv_c = crypto.load_certificate(crypto.FILETYPE_PEM, srv_c_pem)
# can't make M2Crypto to output OpenSSL-compatible hashes...
subject_hash = ("%0.8X" % srv_c.get_subject().hash()).lower()
issuer_hash = ("%0.8X" % srv_c.get_issuer().hash()).lower()
subject_hashes[path] = subject_hash
issuer_hashes[path] = issuer_hash
return subject_hash, issuer_hash
def gen_cert_paths(paths):
# failsafe in case of a loop in path resolution
if len(paths) > 10:
return
subject_hash, issuer_hash = get_cert_hashes(paths[-1])
if subject_hash == issuer_hash:
yield paths
else:
for ca_file in glob.glob(ca_certs_path + '/' + issuer_hash + ".*"):
for perm in gen_cert_paths(paths + [ca_file]):
if not perm in paths:
yield perm
def is_chain_complete_f(file_names):
stack = X509.X509_Stack()
for f_name in file_names[1:]:
cert = X509.load_cert(f_name)
stack.push(cert)
cert = X509.load_cert(file_names[0])
return trusted_context.validate_certificate(cert, stack)
def is_chain_complete(certs):
stack = X509.X509_Stack()
for cert in certs[1:]:
stack.push(cert)
return trusted_context.validate_certificate(certs[0], stack)
def is_chain_trusted(cert_hashes):
c_hash = cert_hashes[0]
""" first check the likely option: the cert dir """
file_name = certs_path + '/' + c_hash + '.pem'
if not os.path.exists(file_name):
""" then try the unlikely option: ca directory """
file_name = ca_certs_path + '/' + c_hash + '.pem'
if not os.path.exists(file_name):
print "File with hash " + c_hash + " is missing!"
return False,None
for cert_paths in gen_cert_paths([ file_name ]):
if is_chain_complete_f(cert_paths):
return True,cert_paths
return False,None
def get_path_for_hash(cert_hash):
f_name = certs_path + '/' + c_hash + '.pem'
if not os.path.exists(f_name):
f_name = ca_certs_path + '/' + c_hash + '.pem'
if not os.path.exists(f_name):
print "File with hash " + c_hash + " is missing!"
return None
return f_name
def is_chain_trusted_at_all(cert_list):
certs = []
stack = X509.X509_Stack()
cert = cert_list[0]
for ca in cert_list[1:]:
stack.push(ca)
return all_CAs_context.validate_certificate(cert, stack)
def collect_key_sizes(file_names):
""" don't collect signature alg for the self signed root """
with open(file_names[-1]) as cert_file:
cert_pem = cert_file.read()
cert = crypto.load_certificate(crypto.FILETYPE_PEM, cert_pem)
pubkey = cert.get_pubkey()
if pubkey.type() == crypto.TYPE_RSA:
keysize['RSA ' + str(pubkey.bits())] += 1
elif pubkey.type() == crypto.TYPE_DSA:
keysize['DSA ' + str(pubkey.bits())] += 1
elif pubkey.type() == 408:
keysize['ECDSA ' + str(pubkey.bits())] += 1
else:
keysize[str(pubkey.type()) + ' ' + str(pubkey.bits())] += 1
root_CA[get_cert_subject_name(cert)] += 1
""" exclude the self signed root and server cert from stats """
for f_name in file_names[1:-1]:
with open(f_name) as cert_file:
cert_pem = cert_file.read()
cert = crypto.load_certificate(crypto.FILETYPE_PEM, cert_pem)
pubkey = cert.get_pubkey()
if pubkey.type() == crypto.TYPE_RSA:
keysize['RSA ' + str(pubkey.bits())] += 1
elif pubkey.type() == crypto.TYPE_DSA:
keysize['DSA ' + str(pubkey.bits())] += 1
elif pubkey.type() == 408:
keysize['ECDSA ' + str(pubkey.bits())] += 1
else:
keysize[str(pubkey.type()) + ' ' + str(pubkey.bits())] += 1
sig_alg[cert.get_signature_algorithm()] += 1
intermediate_CA[get_cert_subject_name(cert)] += 1
all_CAs_context = Context()
all_CAs_context.load_verify_locations(capath=ca_certs_path)
trusted_context = Context()
trusted_context.load_verify_locations(capath=trust_path)
for r,d,flist in os.walk(path):
for f in flist:
server_chain_trusted = False
server_chain_complete = False
server_chains = []
chains_tested = []
valid = True
""" process the file """
f_abs = os.path.join(r,f)
with open(f_abs) as json_file:
""" Keep certificates in memory for a given file """
known_certs = {}
""" discard files that fail to load """
try:
results = json.load(json_file)
except ValueError:
continue
""" discard files with empty results """
if len(results['ciphersuite']) < 1:
continue
valid = True
""" loop over list of ciphers """
for entry in results['ciphersuite']:
""" skip entries which don't have certificate references """
if not 'certificates' in entry:
continue
""" skip entries for A(EC)DH suites """
if len(entry['certificates']) < 1:
continue
if not entry['certificates'] in chains_tested:
certs = []
for c_hash in entry['certificates']:
if c_hash in known_certs:
certs += [known_certs[c_hash]]
else:
cert = X509.load_cert(get_path_for_hash(c_hash))
known_certs[c_hash] = cert
certs += [cert]
if is_chain_trusted_at_all(certs):
ret,tmpchain = is_chain_trusted(entry['certificates'])
if ret:
server_chain_trusted = True
if not tmpchain in server_chains:
server_chains += [tmpchain]
if is_chain_complete(certs):
server_chain_complete = True
chains_tested += [entry['certificates']]
if server_chain_trusted:
if server_chain_complete:
chains["complete"] += 1
else:
chains["incomplete"] += 1
else:
chains["untrusted"] += 1
if valid:
hosts += 1
for chain in server_chains:
collect_key_sizes(chain)
chain_len[str(len(chain))] += 1
if len(chain) == 1:
print "file with chain 1 long " + f_abs
total += 1
""" Display stats """
#print "openssl invocations: " + str(invocations["openssl"])
print "Statistics from " + str(total) + " chains provided by " + str(hosts) + " hosts"
print("\nServer provided chains Count Percent")
print("-------------------------+---------+-------")
for stat in sorted(chains):
percent = round(chains[stat] / hosts * 100, 4)
sys.stdout.write(stat.ljust(25) + " " + str(chains[stat]).ljust(10) + str(percent).ljust(4) + "\n")
print("\nTrusted chain statistics")
print("========================")
print("\nChain length Count Percent")
print("-------------------------+---------+-------")
for stat in sorted(chain_len):
percent = round(chain_len[stat] / total * 100, 4)
sys.stdout.write(stat.ljust(25) + " " + str(chain_len[stat]).ljust(10) + str(percent).ljust(4) + "\n")
print("\nCA Key Size Count Percent")
print("-------------------------+---------+-------")
for stat in sorted(keysize):
percent = round(keysize[stat] / total * 100, 4)
sys.stdout.write(stat.ljust(25) + " " + str(keysize[stat]).ljust(10) + str(percent).ljust(4) + "\n")
print("\nRoot CAs Count Percent")
print("---------------------------------------------+---------+-------")
for stat in sorted(root_CA):
percent = round(root_CA[stat] / total * 100, 4)
sys.stdout.write(stat.ljust(45)[0:45] + " " + str(root_CA[stat]).ljust(10) + str(percent).ljust(4) + "\n")
print("\nSignature algorithm Count Percent")
print("-------------------------+---------+-------")
for stat in sorted(sig_alg):
percent = round(sig_alg[stat] / total * 100, 4)
sys.stdout.write(stat.ljust(25) + " " + str(sig_alg[stat]).ljust(10) + str(percent).ljust(4) + "\n")
print("\nIntermediate CA Count Percent")
print("---------------------------------------------+---------+-------")
for stat in sorted(intermediate_CA):
percent = round(intermediate_CA[stat] / total * 100, 4)
sys.stdout.write(stat.ljust(45)[0:45] + " " + str(intermediate_CA[stat]).ljust(10) + str(percent).ljust(4) + "\n")