Created
September 19, 2018 15:15
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Get hostname list from CT logs, via certspotter, check if hostnames offer valid certificate path.
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#!/usr/bin/env python3 | |
import ssl | |
import socket | |
from pathlib import Path | |
def get_cert_hostnames(): | |
path = Path("~/.certspotter/certs/").expanduser() | |
for f in path.glob("*/*.cert.pem"): | |
# https://stackoverflow.com/a/50072461 | |
c = ssl._ssl._test_decode_cert(f) | |
if 'subjectAltName' in c: | |
for t, n in c['subjectAltName']: | |
if t == "DNS": | |
yield n | |
def get_remote_tls_cert(hostname, port=443, timeout=1): | |
""" | |
Connect to a hostname. Return parsed peer certificate as dict. | |
Raise ssl.SSLError on TLS error | |
Raise ssl.certificateerror on unmatching certificate | |
Raise socket.gaierror on DNS error | |
Raise ConnectionRefusedError on connection refused | |
Raise socket.timeout on timeout | |
""" | |
context = ssl.create_default_context() | |
with socket.create_connection((hostname, port), timeout) as sock: | |
with context.wrap_socket(sock, server_hostname=hostname) as sslsock: | |
return sslsock.getpeercert() | |
def main(): | |
ok, broken, other = [], [], [] | |
for h in get_cert_hostnames(): | |
try: | |
get_remote_tls_cert(h) | |
ok.append(h) | |
print(f"{h} OK") | |
except ssl.SSLError as e: | |
broken.append(h) | |
print(f"{h} broken: {e}") | |
except (socket.error, ConnectionRefusedError, ssl.CertificateError) as e: | |
other.append(h) | |
print(f"{h} other: {e}") | |
print("\n\n===================") | |
print("Good domains: {}".format(len(ok))) | |
print("Other problems: {}".format(len(other))) | |
print("Broken TLS: {}".format(len(broken))) | |
print("===================") | |
print("Broken hostnames:") | |
print("\n".join(broken)) | |
if __name__ == "__main__": | |
main() |
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