Python-slack-sdk: SSL Certification Error

[LMPK]

Description

I am following this guide here to try and build a simple bot: https://www.fullstackpython.com/blog/build-first-slack-bot-python.html

I have made it to the point where you actually run the code "python starterbot.py" and when I run the code I get a SSL certificate verify failed error. I will post the whole error messages at the bottom. I am not sure if it is an SSL error, or if it is because of the proxy I am behind since I am running it from my office computer.

I am running this on windows through the command prompt
Below is the messages I get when trying to run the code
python starterbot.py
Traceback (most recent call last):
File "C:Usersn0342338AppDataLocalProgramsPythonPython36libsite-packagesurllib3connectionpool.py", line 595, in urlopen
self._prepare_proxy(conn)
File "C:Usersn0342338AppDataLocalProgramsPythonPython36libsite-packagesurllib3connectionpool.py", line 816, in _prepare_proxy
conn.connect()
File "C:Usersn0342338AppDataLocalProgramsPythonPython36libsite-packagesurllib3connection.py", line 326, in connect
ssl_context=context)
File "C:Usersn0342338AppDataLocalProgramsPythonPython36libsite-packagesurllib3utilssl_.py", line 329, in ssl_wrap_socket
return context.wrap_socket(sock, server_hostname=server_hostname)
File "C:Usersn0342338AppDataLocalProgramsPythonPython36libssl.py", line 407, in wrap_socket
_context=self, _session=session)
File "C:Usersn0342338AppDataLocalProgramsPythonPython36libssl.py", line 814, in __init__
self.do_handshake()
File "C:Usersn0342338AppDataLocalProgramsPythonPython36libssl.py", line 1068, in do_handshake
self._sslobj.do_handshake()
File "C:Usersn0342338AppDataLocalProgramsPythonPython36libssl.py", line 689, in do_handshake
self._sslobj.do_handshake()
ssl.SSLError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:833)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "C:Usersn0342338AppDataLocalProgramsPythonPython36libsite-packagesrequestsadapters.py", line 440, in send
timeout=timeout
File "C:Usersn0342338AppDataLocalProgramsPythonPython36libsite-packagesurllib3connectionpool.py", line 639, in urlopen
_stacktrace=sys.exc_info()[2])
File "C:Usersn0342338AppDataLocalProgramsPythonPython36libsite-packagesurllib3utilretry.py", line 388, in increment
raise MaxRetryError(_pool, url, error or ResponseError(cause))
urllib3.exceptions.MaxRetryError: HTTPSConnectionPool(host='slack.com', port=443): Max retries exceeded with url: /api/rtm.connect (Caused by SSLError(SSLError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:833)'),))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "C:Usersn0342338AppDataLocalProgramsPythonPython36libsite-packagesslackclientclient.py", line 52, in rtm_connect
self.server.rtm_connect(use_rtm_start=with_team_state, *kwargs)
File "C:Usersn0342338AppDataLocalProgramsPythonPython36libsite-packagesslackclientserver.py", line 131, in rtm_connect
reply = self.api_requester.do(self.token, connect_method, timeout=timeout, post_data=kwargs)
File "C:Usersn0342338AppDataLocalProgramsPythonPython36libsite-packagesslackclientslackrequest.py", line 104, in do
proxies=self.proxies
File "C:Usersn0342338AppDataLocalProgramsPythonPython36libsite-packagesrequestsapi.py", line 112, in post
return request('post', url, data=data, json=json, *kwargs)
File "C:Usersn0342338AppDataLocalProgramsPythonPython36libsite-packagesrequestsapi.py", line 58, in request
return session.request(method=method, url=url, *kwargs)
File "C:Usersn0342338AppDataLocalProgramsPythonPython36libsite-packagesrequestssessions.py", line 508, in request
resp = self.send(prep, *send_kwargs)
File "C:Usersn0342338AppDataLocalProgramsPythonPython36libsite-packagesrequestssessions.py", line 618, in send
r = adapter.send(request, **kwargs)
File "C:Usersn0342338AppDataLocalProgramsPythonPython36libsite-packagesrequestsadapters.py", line 506, in send
raise SSLError(e, request=request)
requests.exceptions.SSLError: HTTPSConnectionPool(host='slack.com', port=443): Max retries exceeded with url: /api/rtm.connect (Caused by SSLError(SSLError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:833)'),))

What type of issue is this? (place an x in one of the [ ])

• [x ] bug
• [ ] enhancement (feature request)
• [ ] question
• [ ] documentation related
• [ ] testing related
• [ ] discussion

Requirements (place an x in each of the [ ])

• [x ] I've read and understood the Contributing guidelines and have done my best effort to follow them.
• [x ] I've read and agree to the Code of Conduct.
• [x ] I've searched for any related issues and avoided creating a duplicate issue.

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Bug Report

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Reproducible in:

slackclient version:

python version:3.6.5

OS version(s):Windows 10

Steps to reproduce:

1.
2.
3.

Expected result:

What you expected to happen

Actual result:

What actually happened

Attachments:

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[DanielLuu]

What was your solution? @LMPK

[LMPK]

@DanielLuu

I had to go into the slackrequest.py file and under the 'return requests.post()' add in 'verify=False'. So it looks like this:

return requests.post(
            url,
            headers=headers,
            data=post_data,
            verify=False,
            files=files,
            timeout=timeout,
            proxies=proxiess
            #proxies=self.proxies
        )

This is a workaround that I found, so it is a bit janky, but it fixed that error for me.

I also had to specify the proxies that are used at my company, and make sure these are referenced in the code above. By doing this:

proxiess={
            'http': 'http://user:pass@proxy:port',
            'https': 'http://user:pass@proxy:port',
        }

The above two fixed that problem, but I encountered an Slack Login Error after that which I am still trying to figure out.

Hope this helps.

[pnfnp]

You can add ssl=True and works like a charm!

client = slack.WebClient(token='my-secret-token', ssl=True)