@@ 1,674 @@
+ GNU GENERAL PUBLIC LICENSE
+ Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
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+
+ END OF TERMS AND CONDITIONS
+
+ How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+ <one line to give the program's name and a brief idea of what it does.>
+ Copyright (C) <year> <name of author>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+ If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+ <program> Copyright (C) <year> <name of author>
+ This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ This is free software, and you are welcome to redistribute it
+ under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License. Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+ You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+ The GNU General Public License does not permit incorporating your program
+into proprietary programs. If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library. If this is what you want to do, use the GNU Lesser General
+Public License instead of this License. But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
@@ 1,207 @@
+import argparse
+import re
+import socket
+import ssl
+from datetime import datetime
+
+import OpenSSL.crypto
+import colorama
+
+_store = None
+
+
+def get_store():
+ global _store
+ if _store is not None:
+ return _store
+
+ defaults = ssl.get_default_verify_paths()
+ _store = OpenSSL.crypto.X509Store()
+ _store.load_locations(defaults.cafile, defaults.capath)
+
+ return _store
+
+
+def cn_to_regex(cn):
+ result = []
+ for part in cn.split('.'):
+ result.append(part.replace('*', r'[^\.]+'))
+ parts = r'\.'.join(result)
+ return f"^{parts}$"
+
+
+def verify_callback(sock, x509, errnum, errdepth, ok):
+ if not ok:
+ print(errnum, errdepth)
+ return True
+
+
+def ocsp_callback(sock, ocsp_bytes, user_data):
+ print('ocsp', ocsp_bytes)
+ return True
+
+
+def check_ocsp(domain, port, chain):
+ # TODO: Actually make this work and include in the cert check
+ ctx = OpenSSL.SSL.Context(OpenSSL.SSL.SSLv23_METHOD)
+ ctx.set_options(OpenSSL.SSL.OP_NO_SSLv2)
+ ctx.set_options(OpenSSL.SSL.OP_NO_SSLv3)
+ ctx.set_timeout(10)
+ ctx.use_certificate(chain[0])
+ defaults = ssl.get_default_verify_paths()
+ ctx.load_verify_locations(defaults.cafile, defaults.capath)
+
+ # ctx.set_verify(VERIFY_PEER, callback=verify_callback)
+ ctx.set_mode(OpenSSL.SSL.VERIFY_CLIENT_ONCE)
+ ctx.set_ocsp_client_callback(callback=ocsp_callback, data=None)
+ conn = socket.create_connection((domain, port))
+ sock = OpenSSL.SSL.Connection(ctx, conn)
+ sock.set_tlsext_host_name(domain.encode())
+ sock.request_ocsp()
+ sock.set_connect_state()
+ try:
+ pass
+ sock.do_handshake()
+ except Exception as e:
+ print(e)
+
+
+def get_tls_certificate(domain, port):
+ ctx = OpenSSL.SSL.Context(OpenSSL.SSL.TLSv1_2_METHOD)
+ conn = socket.create_connection((domain, port))
+ sock = OpenSSL.SSL.Connection(ctx, conn)
+ sock.set_connect_state()
+ sock.set_tlsext_host_name(domain.encode())
+ sock.do_handshake()
+ chain = sock.get_peer_cert_chain()
+ return chain
+
+
+def check_generic(domain, port):
+ chain = get_tls_certificate(domain, port)
+ x509 = chain[0]
+ components = x509.get_subject().get_components()
+ for component in components:
+ if component[0] == b'CN':
+ cn = component[1].decode()
+ break
+ else:
+ return False, "Certificate had no common name"
+
+ names = [cn]
+
+ ocsp = False
+ for i in range(0, x509.get_extension_count()):
+ ext = x509.get_extension(i)
+ if ext.get_short_name() == b'subjectAltName':
+ san = str(ext)
+ sans = san.split(', ')
+ for s in sans:
+ s_type, s_name = s.split(":", maxsplit=1)
+ if s_type == 'DNS':
+ names.append(s_name)
+ if ext.get_short_name() == b'authorityInfoAccess':
+ info = str(ext)
+ for line in info.splitlines():
+ if line.startswith('OCSP '):
+ _, ocsp_uri = line.split('URI:')
+ ocsp = True
+
+ for name in names:
+ name_regex = cn_to_regex(name)
+ if re.match(name_regex, domain):
+ break
+ else:
+ return False, f"Wrong CN, certificate is for {cn}"
+
+ # TODO: If ocsp is True, verify ocsp
+
+ not_before = datetime.strptime(x509.get_notBefore().decode(), '%Y%m%d%H%M%SZ')
+ not_after = datetime.strptime(x509.get_notAfter().decode(), '%Y%m%d%H%M%SZ')
+ now = datetime.now()
+ time_left = not_after - now
+
+ if now < not_before:
+ return False, f"Certificate is not yet valid (valid after {not_before})"
+
+ if now > not_after:
+ return False, f"Certificate is expired (valid until {not_after})"
+
+ if (not_after - now).days < 20:
+ return None, f"Certificate almost expired ({time_left})"
+
+ # Check the chain
+ store = get_store()
+ store_ctx = OpenSSL.crypto.X509StoreContext(store, x509, chain=chain)
+ try:
+ store_ctx.get_verified_chain()
+ except OpenSSL.crypto.X509StoreContextError as e:
+ errnum = e.args[0][0]
+ if errnum == 18:
+ return False, "Certificate is self-signed"
+ elif errnum == 19:
+ return False, "Self-signed certificate in the certificate chain"
+ return False, str(e)
+
+ return True, f"Ok, {time_left.days} days remaining"
+
+
+def main():
+ parser = argparse.ArgumentParser("Certificate checker")
+ parser.add_argument('domain', nargs='+')
+ parser.add_argument('--https', action=argparse.BooleanOptionalAction, default=True, help='Check http')
+ parser.add_argument('--imaps', action=argparse.BooleanOptionalAction, default=False, help='Check imap')
+ parser.add_argument('--pop3s', action=argparse.BooleanOptionalAction, default=False, help='Check pop3s')
+ parser.add_argument('--smtps', action=argparse.BooleanOptionalAction, default=False, help='Check smtp')
+ parser.add_argument('--port', action="append", help="Check a specific port", default=[], type=int)
+ args = parser.parse_args()
+
+ domain_len = len(max(args.domain, key=len))
+
+ protolist = []
+ if args.https:
+ protolist.append('https')
+ if args.imaps:
+ protolist.append('imaps')
+ if args.pop3s:
+ protolist.append('pop3s')
+ if args.smtps:
+ protolist.append('smtps')
+ protolist.extend(args.port)
+
+ protocols = {
+ 'https': 443,
+ 'imaps': 993,
+ 'pop3s': 995,
+ 'smtps': 465,
+ }
+
+ returncode = 0
+ for domain in args.domain:
+ print(domain.ljust(domain_len + 2), end='')
+ first_proto = True
+
+ for proto in protolist:
+ if len(protolist) > 1:
+ if not first_proto:
+ print(' ' * (domain_len + 2), end='')
+ print(f'{str(proto).ljust(5)} ', end='')
+ first_proto = False
+
+ if isinstance(proto, str):
+ proto = protocols[proto]
+ result = check_generic(domain, proto)
+
+ if result[0] is True:
+ print(colorama.Fore.GREEN, result[1], colorama.Style.RESET_ALL)
+ elif result[0] is False:
+ print(colorama.Fore.RED, result[1], colorama.Style.RESET_ALL)
+ returncode = 1
+ else:
+ print(colorama.Fore.YELLOW, result[1], colorama.Style.RESET_ALL)
+
+ exit(returncode)
+
+
+if __name__ == '__main__':
+ main()