urlopen error [dh key too small] with python suds client for perfmon api

zerocool443 — Mon, 17 Sep 2018 13:18:42 GMT

So i am using this scripts that uses perfmon api to fetch counters/details from call manager.

Some details about the script.

Python 3.x

Libs: suds-jurko, ssl

API: perfmon api

----------------------------------------------------------------------------------------

The script works perfectly fine on my lab cucm. but when i test this with another labs it gives me following errors.

urllib.error.URLError: <urlopen error [SSL: SSL_NEGATIVE_LENGTH] dh key too small (_ssl.c:777)>

Code snippet:

from suds.client import Client
from suds.xsd.doctor import Import
from suds.xsd.doctor import ImportDoctor
import logging
import ssl


ssl._create_default_https_context = ssl._create_unverified_context
wsdl = 'https://10.106.79.98:8443/perfmonservice2/services/PerfmonService?wsdl'
location = 'https://10.106.79.98:8443/perfmonservice2/services/PerfmonService'
username = test
password = test
tns = 'http://schemas.cisco.com/ast/soap/'
imp = Import('http://schemas.xmlsoap.org/soap/encoding/',
 'http://schemas.xmlsoap.org/soap/encoding/')
imp.filter.add(tns)
client = Client(wsdl, location=location, faults=False, plugins=[ImportDoctor(imp)], username=username,password=password)

perfmon_objects_1 = ['AnnunciatorResourceTotal', 'MOHTotalMulticastResources', 'MTPResourceAvailable',
 'SWConferenceResourceAvailable', 'RegisteredHardwarePhones', 'TLSConnectedSIPTrunks', ]

res = client.service.perfmonCollectCounterData(node_name, 'Cisco CallManager')

print('CALL MANAGER Resources')
for node in res[1]:
 counter_name=(str(node['Name'].split('\\')[4]))
 if(counter_name in perfmon_objects_1):
 print(counter_name)
 print(str(node['Value']))

Re: urlopen error [dh key too small] with python suds client for perfmon api

Chris Deren — Tue, 11 Dec 2018 02:27:58 GMT

Did you ever find a solution to this by any chance?

Re: urlopen error [dh key too small] with python suds client for perfmon api

zerocool443 — Tue, 11 Dec 2018 05:54:17 GMT

hey chris,

The code worked on py 3.4.

I was developing the script on py 2.7 earlier.

As per the understanding py 3.4 implementation of urlopen either ignores those alerts or doesn't use those key sharing algorithms.

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urlopen error [dh key too small] with python suds client for perfmon api

Re: urlopen error [dh key too small] with python suds client for perfmon api

Re: urlopen error [dh key too small] with python suds client for perfmon api