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collect statistics about found certificates
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Hubert Kario
Hubert Kario
parent
ab8b794557
commit
68577f7918
346
top1m/parse_CAs.py
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346
top1m/parse_CAs.py
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#!/usr/bin/env python
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# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this
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# file, You can obtain one at http://mozilla.org/MPL/2.0/.
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# Author: Hubert Kario - 2014
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from __future__ import division
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path = "./results/"
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ca_certs_path = "./ca_files"
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certs_path = "./certs"
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""" only root CAs, no cached intermediate certs """
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trust_path = "./ca_trusted"
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import json
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import sys
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from collections import defaultdict
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import os
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import re
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import subprocess
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from OpenSSL import crypto
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from M2Crypto import X509, EVP
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from m2ext import _m2ext
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from m2ext import SSL
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import glob
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from pprint import pprint
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# override m2ext implementation so that it is possible to provide additional
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# certificates to be used during verification. Requires m2ext with a small fix
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# from https://github.com/tomato42/m2ext/tree/extended_ctx_init
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class Context(SSL.Context):
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def validate_certificate(self, cert, chain=None):
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"""
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Validate a certificate using this SSL Context
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"""
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if chain:
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ptr = chain._ptr()
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else:
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ptr = None
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store_ctx = X509.X509_Store_Context(_m2ext.x509_store_ctx_new(), _pyfree=1)
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_m2ext.x509_store_ctx_init(store_ctx.ctx,
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self.get_cert_store().store,
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cert.x509, ptr)
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rc = _m2ext.x509_verify_cert(store_ctx.ctx)
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if rc < 0:
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raise SSL.SSLError("Empty context")
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return rc != 0
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invocations = defaultdict(int)
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total = 0
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hosts = 0
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chains = defaultdict(int)
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chain_len = defaultdict(int)
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keysize = defaultdict(int)
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root_CA = defaultdict(int)
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sig_alg = defaultdict(int)
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intermediate_CA = defaultdict(int)
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subject_hashes = {}
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issuer_hashes = {}
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def get_cert_subject_name(cert):
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subject = cert.get_subject()
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commonName = None
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organization = None
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for elem,val in subject.get_components():
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if elem == "CN" and commonName is None:
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commonName = val
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if elem == "O" and organization is None:
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organization = val
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s_hash = "(" + ("%0.8X" % subject.hash()).lower() + ") "
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if commonName is not None:
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return s_hash + commonName
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elif organization is not None:
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return s_hash + organization
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else:
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return s_hash
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def get_cert_hashes(path):
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if path in subject_hashes:
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return subject_hashes[path], issuer_hashes[path]
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with open(path) as srv_c_f:
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srv_c_pem = srv_c_f.read()
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srv_c = crypto.load_certificate(crypto.FILETYPE_PEM, srv_c_pem)
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# can't make M2Crypto to output OpenSSL-compatible hashes...
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subject_hash = ("%0.8X" % srv_c.get_subject().hash()).lower()
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issuer_hash = ("%0.8X" % srv_c.get_issuer().hash()).lower()
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subject_hashes[path] = subject_hash
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issuer_hashes[path] = issuer_hash
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return subject_hash, issuer_hash
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def gen_cert_paths(paths):
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# failsafe in case of a loop in path resolution
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if len(paths) > 10:
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return
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subject_hash, issuer_hash = get_cert_hashes(paths[-1])
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if subject_hash == issuer_hash:
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yield paths
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else:
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for ca_file in glob.glob(ca_certs_path + '/' + issuer_hash + ".*"):
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for perm in gen_cert_paths(paths + [ca_file]):
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if not perm in paths:
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yield perm
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def is_chain_complete_f(file_names):
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stack = X509.X509_Stack()
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for f_name in file_names[1:]:
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cert = X509.load_cert(f_name)
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stack.push(cert)
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cert = X509.load_cert(file_names[0])
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return trusted_context.validate_certificate(cert, stack)
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def is_chain_complete(certs):
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stack = X509.X509_Stack()
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for cert in certs[1:]:
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stack.push(cert)
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return trusted_context.validate_certificate(certs[0], stack)
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def is_chain_trusted(cert_hashes):
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c_hash = cert_hashes[0]
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""" first check the likely option: the cert dir """
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file_name = certs_path + '/' + c_hash + '.pem'
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if not os.path.exists(file_name):
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""" then try the unlikely option: ca directory """
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file_name = ca_certs_path + '/' + c_hash + '.pem'
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if not os.path.exists(file_name):
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print "File with hash " + c_hash + " is missing!"
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return False,None
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for cert_paths in gen_cert_paths([ file_name ]):
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if is_chain_complete_f(cert_paths):
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return True,cert_paths
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return False,None
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def get_path_for_hash(cert_hash):
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f_name = certs_path + '/' + c_hash + '.pem'
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if not os.path.exists(f_name):
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f_name = ca_certs_path + '/' + c_hash + '.pem'
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if not os.path.exists(f_name):
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print "File with hash " + c_hash + " is missing!"
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return None
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return f_name
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def is_chain_trusted_at_all(cert_list):
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certs = []
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stack = X509.X509_Stack()
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cert = cert_list[0]
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for ca in cert_list[1:]:
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stack.push(ca)
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return all_CAs_context.validate_certificate(cert, stack)
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def collect_key_sizes(file_names):
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""" don't collect signature alg for the self signed root """
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with open(file_names[-1]) as cert_file:
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cert_pem = cert_file.read()
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cert = crypto.load_certificate(crypto.FILETYPE_PEM, cert_pem)
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pubkey = cert.get_pubkey()
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if pubkey.type() == crypto.TYPE_RSA:
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keysize['RSA ' + str(pubkey.bits())] += 1
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elif pubkey.type() == crypto.TYPE_DSA:
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keysize['DSA ' + str(pubkey.bits())] += 1
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elif pubkey.type() == 408:
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keysize['ECDSA ' + str(pubkey.bits())] += 1
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else:
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keysize[str(pubkey.type()) + ' ' + str(pubkey.bits())] += 1
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root_CA[get_cert_subject_name(cert)] += 1
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""" exclude the self signed root and server cert from stats """
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for f_name in file_names[1:-1]:
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with open(f_name) as cert_file:
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cert_pem = cert_file.read()
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cert = crypto.load_certificate(crypto.FILETYPE_PEM, cert_pem)
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pubkey = cert.get_pubkey()
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if pubkey.type() == crypto.TYPE_RSA:
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keysize['RSA ' + str(pubkey.bits())] += 1
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elif pubkey.type() == crypto.TYPE_DSA:
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keysize['DSA ' + str(pubkey.bits())] += 1
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elif pubkey.type() == 408:
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keysize['ECDSA ' + str(pubkey.bits())] += 1
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else:
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keysize[str(pubkey.type()) + ' ' + str(pubkey.bits())] += 1
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sig_alg[cert.get_signature_algorithm()] += 1
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intermediate_CA[get_cert_subject_name(cert)] += 1
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all_CAs_context = Context()
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all_CAs_context.load_verify_locations(capath=ca_certs_path)
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trusted_context = Context()
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trusted_context.load_verify_locations(capath=trust_path)
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for r,d,flist in os.walk(path):
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for f in flist:
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server_chain_trusted = False
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server_chain_complete = False
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server_chains = []
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chains_tested = []
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valid = True
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""" process the file """
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f_abs = os.path.join(r,f)
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with open(f_abs) as json_file:
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""" Keep certificates in memory for a given file """
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known_certs = {}
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""" discard files that fail to load """
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try:
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results = json.load(json_file)
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except ValueError:
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continue
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""" discard files with empty results """
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if len(results['ciphersuite']) < 1:
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continue
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valid = True
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""" loop over list of ciphers """
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for entry in results['ciphersuite']:
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""" skip entries which don't have certificate references """
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if not 'certificates' in entry:
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continue
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""" skip entries for A(EC)DH suites """
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if len(entry['certificates']) < 1:
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continue
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if not entry['certificates'] in chains_tested:
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certs = []
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for c_hash in entry['certificates']:
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if c_hash in known_certs:
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certs += [known_certs[c_hash]]
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else:
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cert = X509.load_cert(get_path_for_hash(c_hash))
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known_certs[c_hash] = cert
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certs += [cert]
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if is_chain_trusted_at_all(certs):
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ret,tmpchain = is_chain_trusted(entry['certificates'])
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if ret:
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server_chain_trusted = True
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if not tmpchain in server_chains:
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server_chains += [tmpchain]
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if is_chain_complete(certs):
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server_chain_complete = True
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chains_tested += [entry['certificates']]
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if server_chain_trusted:
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if server_chain_complete:
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chains["complete"] += 1
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else:
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chains["incomplete"] += 1
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else:
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chains["untrusted"] += 1
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if valid:
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hosts += 1
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for chain in server_chains:
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collect_key_sizes(chain)
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chain_len[str(len(chain))] += 1
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if len(chain) == 1:
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print "file with chain 1 long " + f_abs
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total += 1
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""" Display stats """
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#print "openssl invocations: " + str(invocations["openssl"])
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print "Statistics from " + str(total) + " chains provided by " + str(hosts) + " hosts"
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print("\nServer provided chains Count Percent")
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print("-------------------------+---------+-------")
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for stat in sorted(chains):
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percent = round(chains[stat] / hosts * 100, 4)
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sys.stdout.write(stat.ljust(25) + " " + str(chains[stat]).ljust(10) + str(percent).ljust(4) + "\n")
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print("\nTrusted chain statistics")
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print("========================")
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print("\nChain length Count Percent")
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print("-------------------------+---------+-------")
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for stat in sorted(chain_len):
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percent = round(chain_len[stat] / total * 100, 4)
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sys.stdout.write(stat.ljust(25) + " " + str(chain_len[stat]).ljust(10) + str(percent).ljust(4) + "\n")
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print("\nCA Key Size Count Percent")
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print("-------------------------+---------+-------")
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for stat in sorted(keysize):
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percent = round(keysize[stat] / total * 100, 4)
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sys.stdout.write(stat.ljust(25) + " " + str(keysize[stat]).ljust(10) + str(percent).ljust(4) + "\n")
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print("\nRoot CAs Count Percent")
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print("---------------------------------------------+---------+-------")
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for stat in sorted(root_CA):
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percent = round(root_CA[stat] / total * 100, 4)
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sys.stdout.write(stat.ljust(45)[0:45] + " " + str(root_CA[stat]).ljust(10) + str(percent).ljust(4) + "\n")
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print("\nSignature algorithm Count Percent")
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print("-------------------------+---------+-------")
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for stat in sorted(sig_alg):
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percent = round(sig_alg[stat] / total * 100, 4)
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sys.stdout.write(stat.ljust(25) + " " + str(sig_alg[stat]).ljust(10) + str(percent).ljust(4) + "\n")
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print("\nIntermediate CA Count Percent")
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print("---------------------------------------------+---------+-------")
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for stat in sorted(intermediate_CA):
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percent = round(intermediate_CA[stat] / total * 100, 4)
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sys.stdout.write(stat.ljust(45)[0:45] + " " + str(intermediate_CA[stat]).ljust(10) + str(percent).ljust(4) + "\n")
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