Ci-dessous est mon script qui sert de chèque dans les nagios. Il se connecte à un hôte spécifique, il vérifie que le certificat est valide dans un seuil défini par les options -c / -w. Il peut vérifier que le CN du certificat correspond au nom que vous attendez.
Vous avez besoin de la bibliothèque python openssl, et j'ai fait tous les tests avec python 2.7.
Il serait trivial qu'un script shell l'appelle plusieurs fois. Le script renvoie les valeurs de sortie nagios standard pour l'état critique / avertissement / ok.
Une simple vérification du certificat de Google peut être effectuée comme ceci.
./check_ssl_certificate -H www.google.com -p 443 -n www.google.com
Expire OK[108d] - CN OK - cn:www.google.com
check_ssl_certificate
#!/usr/bin/python
"""
Usage: check_ssl_certificate -H <host> -p <port> [-m <method>]
[-c <days>] [-w <days>]
-h show the help
-H <HOST> host/ip to check
-p <port> port number
-m <method> (SSLv2|SSLv3|SSLv23|TLSv1) defaults to SSLv23
-c <days> day threshold for critical
-w <days> day threshold for warning
-n name Check CN value is valid
"""
import getopt,sys
import __main__
from OpenSSL import SSL
import socket
import datetime
# On debian Based systems requires python-openssl
def get_options():
"get options"
options={'host':'',
'port':'',
'method':'SSLv23',
'critical':5,
'warning':15,
'cn':''}
try:
opts, args = getopt.getopt(sys.argv[1:], "hH:p:m:c:w:n:", ['help', "host", 'port', 'method'])
except getopt.GetoptError as err:
# print help information and exit:
print str(err) # will print something like "option -a not recognized"
usage()
sys.exit(2)
for o, a in opts:
if o in ("-h", "--help"):
print __main__.__doc__
sys.exit()
elif o in ("-H", "--host"):
options['host'] = a
pass
elif o in ("-p", "--port"):
options['port'] = a
elif o in ("-m", "--method"):
options['method'] = a
elif o == '-c':
options['critical'] = int(a)
elif o == '-w':
options['warning'] = int(a)
elif o == '-n':
options['cn'] = a
else:
assert False, "unhandled option"
if (''==options['host'] or
''==options['port']):
print __main__.__doc__
sys.exit()
if options['critical'] >= options['warning']:
print "Critical must be smaller then warning"
print __main__.__doc__
sys.exit()
return options
def main():
options = get_options()
# Initialize context
if options['method']=='SSLv3':
ctx = SSL.Context(SSL.SSLv3_METHOD)
elif options['method']=='SSLv2':
ctx = SSL.Context(SSL.SSLv2_METHOD)
elif options['method']=='SSLv23':
ctx = SSL.Context(SSL.SSLv23_METHOD)
else:
ctx = SSL.Context(SSL.TLSv1_METHOD)
# Set up client
sock = SSL.Connection(ctx, socket.socket(socket.AF_INET, socket.SOCK_STREAM))
sock.connect((options['host'], int(options['port'])))
# Send an EOF
try:
sock.send("\x04")
sock.shutdown()
peer_cert=sock.get_peer_certificate()
sock.close()
except SSL.Error,e:
print e
exit_status=0
exit_message=[]
cur_date = datetime.datetime.utcnow()
cert_nbefore = datetime.datetime.strptime(peer_cert.get_notBefore(),'%Y%m%d%H%M%SZ')
cert_nafter = datetime.datetime.strptime(peer_cert.get_notAfter(),'%Y%m%d%H%M%SZ')
expire_days = int((cert_nafter - cur_date).days)
if cert_nbefore > cur_date:
if exit_status < 2:
exit_status = 2
exit_message.append('C: cert is not valid')
elif expire_days < 0:
if exit_status < 2:
exit_status = 2
exit_message.append('Expire critical (expired)')
elif options['critical'] > expire_days:
if exit_status < 2:
exit_status = 2
exit_message.append('Expire critical')
elif options['warning'] > expire_days:
if exit_status < 1:
exit_status = 1
exit_message.append('Expire warning')
else:
exit_message.append('Expire OK')
exit_message.append('['+str(expire_days)+'d]')
for part in peer_cert.get_subject().get_components():
if part[0]=='CN':
cert_cn=part[1]
if options['cn']!='' and options['cn'].lower()!=cert_cn.lower():
if exit_status < 2:
exit_status = 2
exit_message.append(' - CN mismatch')
else:
exit_message.append(' - CN OK')
exit_message.append(' - cn:'+cert_cn)
print ''.join(exit_message)
sys.exit(exit_status)
if __name__ == "__main__":
main()