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Python script to check on SSL certificates
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# -*- encoding: utf-8 -*- | |
# requires a recent enough python with idna support in socket | |
# pyopenssl, cryptography and idna | |
from OpenSSL import SSL | |
from cryptography import x509 | |
from cryptography.x509.oid import NameOID | |
import idna | |
from socket import socket | |
from collections import namedtuple | |
HostInfo = namedtuple(field_names='cert hostname peername', typename='HostInfo') | |
HOSTS = [ | |
('damjan.softver.org.mk', 443), | |
('expired.badssl.com', 443), | |
('wrong.host.badssl.com', 443), | |
('ca.ocsr.nl', 443), | |
('faß.de', 443), | |
('самодеј.мкд', 443), | |
] | |
def verify_cert(cert, hostname): | |
# verify notAfter/notBefore, CA trusted, servername/sni/hostname | |
cert.has_expired() | |
# service_identity.pyopenssl.verify_hostname(client_ssl, hostname) | |
# issuer | |
def get_certificate(hostname, port): | |
hostname_idna = idna.encode(hostname) | |
sock = socket() | |
sock.connect((hostname, port)) | |
peername = sock.getpeername() | |
ctx = SSL.Context(SSL.SSLv23_METHOD) # most compatible | |
ctx.check_hostname = False | |
ctx.verify_mode = SSL.VERIFY_NONE | |
sock_ssl = SSL.Connection(ctx, sock) | |
sock_ssl.set_connect_state() | |
sock_ssl.set_tlsext_host_name(hostname_idna) | |
sock_ssl.do_handshake() | |
cert = sock_ssl.get_peer_certificate() | |
crypto_cert = cert.to_cryptography() | |
sock_ssl.close() | |
sock.close() | |
return HostInfo(cert=crypto_cert, peername=peername, hostname=hostname) | |
def get_alt_names(cert): | |
try: | |
ext = cert.extensions.get_extension_for_class(x509.SubjectAlternativeName) | |
return ext.value.get_values_for_type(x509.DNSName) | |
except x509.ExtensionNotFound: | |
return None | |
def get_common_name(cert): | |
try: | |
names = cert.subject.get_attributes_for_oid(NameOID.COMMON_NAME) | |
return names[0].value | |
except x509.ExtensionNotFound: | |
return None | |
def get_issuer(cert): | |
try: | |
names = cert.issuer.get_attributes_for_oid(NameOID.COMMON_NAME) | |
return names[0].value | |
except x509.ExtensionNotFound: | |
return None | |
def print_basic_info(hostinfo): | |
s = '''» {hostname} « … {peername} | |
\tcommonName: {commonname} | |
\tSAN: {SAN} | |
\tissuer: {issuer} | |
\tnotBefore: {notbefore} | |
\tnotAfter: {notafter} | |
'''.format( | |
hostname=hostinfo.hostname, | |
peername=hostinfo.peername, | |
commonname=get_common_name(hostinfo.cert), | |
SAN=get_alt_names(hostinfo.cert), | |
issuer=get_issuer(hostinfo.cert), | |
notbefore=hostinfo.cert.not_valid_before, | |
notafter=hostinfo.cert.not_valid_after | |
) | |
print(s) | |
def check_it_out(hostname, port): | |
hostinfo = get_certificate(hostname, port) | |
print_basic_info(hostinfo) | |
import concurrent.futures | |
if __name__ == '__main__': | |
with concurrent.futures.ThreadPoolExecutor(max_workers=4) as e: | |
for hostinfo in e.map(lambda x: get_certificate(x[0], x[1]), HOSTS): | |
print_basic_info(hostinfo) |
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