Python Requests – SSL error for client side cert

Question

I’m calling a REST API with requests in python and so far have been successful when I set verify=False.

Now, I have to use client side cert that I need to import for authentication and I’m getting this error everytime I’m using the cert (.pfx). cert.pfx is password protected.

r = requests.post(url, params=payload, headers=headers, 
                  data=payload, verify='cert.pfx')

This is the error I’m getting:

Traceback (most recent call last):
File "C:UsersmeDesktoptest.py", line 65, in <module>
r = requests.post(url, params=payload, headers=headers, data=payload, verify=cafile)
File "C:Python33libsite-packagesrequestsapi.py", line 88, in post
return request('post', url, data=data, **kwargs)
File "C:Python33libsite-packagesrequestsapi.py", line 44, in request
return session.request(method=method, url=url, **kwargs)
File "C:Python33libsite-packagesrequestssessions.py", line 346, in request
resp = self.send(prep, **send_kwargs)
File "C:Python33libsite-packagesrequestssessions.py", line 449, in send
r = adapter.send(request, **kwargs)
File "C:Python33libsite-packagesrequestsadapters.py", line 322, in send
raise SSLError(e)
requests.exceptions.SSLError: unknown error (_ssl.c:2158)

I’ve also tried openssl to get .pem and key but with .pem and getting SSL: CERTIFICATE_VERIFY_FAILED

Can someone please direct me on how to import the certs and where to place it? I tried searching but still faced with the same issue.

Asked By: onlyme

||

Source

Answer 1

I had this same problem. The verify parameter refers to the server’s certificate. You want the cert parameter to specify your client certificate.

import requests
cert_file_path = "cert.pem"
key_file_path = "key.pem"

url = "https://example.com/resource"
params = {"param_1": "value_1", "param_2": "value_2"}
cert = (cert_file_path, key_file_path)
r = requests.get(url, params=params, cert=cert)

Answered By: bbayles

Answer 2

I had the same problem and to resolve this, I came to know that we have to send RootCA along with certificate and its key as shown below,

response = requests.post(url, data=your_data, cert=('path_client_certificate_file', 'path_certificate_key_file'), verify='path_rootCA')

Answered By: Ahmad Khan

Answer 3

If it is possible to transfer a certificate directly from the Windows certificate store?
From what I understand, the requests library only accepts the file path. are there any adapters or other libraries that make it as easy as requests?

cert_name = "NAME CERT IN CERT STORE"
def export_cert_to_pem(cert, pem_path):
    pem = cert.get_pem()

    with open(pem_path, "w") as pem_file:
        pem_file.write(pem)


def find_cert_in_trusted_roots(cert_name):
    for storename in ("CA", "ROOT"):
        with wincertstore.CertSystemStore(storename) as store:
            for cert in store.itercerts(usage=wincertstore.SERVER_AUTH):
                if cert.get_name().lower() == cert_name.lower():
                    export_cert_to_pem(cert, cert_name + ".pem")

                    #export_cert_to_pem(cert, pem_path)
                    return 1

    return 0




cert=find_cert_in_trusted_roots(cert_name)
response = requests.post(some_url, data=your_data, cert=cert)

Answered By: NonniSnon

Python Requests – SSL error for client side cert

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