]>
git.siccegge.de Git - dane-monitoring-plugins.git/blob - check_dane_smtp
5 from __future__
import print_function
11 from socket
import socket
, AF_INET6
, AF_INET
, create_connection
12 from ssl
import SSLContext
, PROTOCOL_TLSv1_2
, CERT_REQUIRED
, cert_time_to_seconds
, SSLError
, CertificateError
, create_default_context
13 from unbound
import ub_ctx
, idn2dname
, ub_strerror
15 from check_dane
.tlsa
import verify_tlsa_record
16 from check_dane
.cert
import verify_certificate
, add_certificate_options
18 def init_connection(sslcontext
, args
):
22 port
= 465 if args
.port
== 0 else args
.port
23 connection
= sslcontext
.wrap_socket(socket(AF_INET
),
25 connection
.connect((host
, port
))
28 port
= 25 if args
.port
== 0 else args
.port
30 connection
= create_connection((host
, port
))
31 answer
= connection
.recv(512)
34 connection
.send(b
"EHLO localhost\r\n")
35 answer
= connection
.recv(512)
38 connection
.send(b
"STARTTLS\r\n")
39 answer
= connection
.recv(512)
42 connection
= sslcontext
.wrap_socket(connection
, server_hostname
=host
)
43 connection
.do_handshake()
48 def close_connection(connection
):
49 connection
.send(b
"QUIT\r\n")
50 answer
= connection
.recv(512)
55 sslcontext
= SSLContext(PROTOCOL_TLSv1_2
)
56 sslcontext
.verify_mode
= CERT_REQUIRED
57 sslcontext
.load_verify_locations(args
.castore
)
60 resolver
.add_ta_file(args
.ancor
)
62 return sslcontext
, resolver
66 logging
.basicConfig(format
='%(levelname)5s %(message)s')
67 parser
= argparse
.ArgumentParser()
68 parser
.add_argument("Host")
70 parser
.add_argument("--verbose", action
="store_true")
71 parser
.add_argument("--quiet", action
="store_true")
72 parser
.add_argument("-p", "--port",
73 action
="store", type=int, default
=0,
75 parser
.add_argument("--ssl",
77 help="Use direct TLS connection instead of starttls (default: disabled)")
78 parser
.add_argument("--check-dane",
80 help="Verify presented certificate via DANE (default: enabled)")
81 parser
.add_argument("--check-ca",
83 help="Verify presented certificate via the CA system (default: enabled)")
84 parser
.add_argument("--check-expire",
86 help="Verify presented certificate for expiration (default: enabled)")
88 parser
.add_argument("-a", "--ancor",
89 action
="store", type=str, default
="/etc/unbound/root.key",
90 help="DNSSEC root ancor")
91 parser
.add_argument("--castore", action
="store", type=str,
92 default
="/etc/ssl/certs/ca-certificates.crt",
93 help="ca certificate bundle")
95 group
= parser
.add_mutually_exclusive_group()
96 group
.add_argument("-6", "--6", action
="store_true", help="check via IPv6 only")
97 group
.add_argument("-4", "--4", action
="store_true", help="check via IPv4 only")
98 group
.add_argument("--64", action
="store_false", help="check via IPv4 and IPv6 (default)")
100 add_certificate_options(parser
)
102 args
= parser
.parse_args()
105 logging
.getLogger().setLevel(logging
.DEBUG
)
107 logging
.getLogger().setLevel(logging
.WARNING
)
109 logging
.getLogger().setLevel(logging
.INFO
)
113 port
= 465 if args
.ssl
else 25
114 host
= args
.Host
.encode('idna').decode()
116 sslcontext
, resolver
= init(args
)
118 connection
= init_connection(sslcontext
, args
)
119 except ConnectionRefusedError
:
120 logging
.error("Connection refused")
123 retval
= verify_certificate(connection
.getpeercert(), args
)
124 nretval
= verify_tlsa_record(resolver
, "_%d._tcp.%s" % (port
, host
), connection
.getpeercert(binary_form
=True))
125 retval
= max(retval
, nretval
)
127 close_connection(connection
)
131 if __name__
== '__main__':