I can access https://siscourses.ethz.ch/python_dbiol/data/logistic_data.txt with curl or within google chrome without any complaints about the certificate.
If I run
import requests
request.get("https://siscourses.ethz.ch/python_dbiol/data/logistic_data.txt")
I get
ssl.SSLError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify
failed (_ssl.c:749)
What is going wrong here ? I could disable certificate validation, but would prefer to understand the underlying problem.
"siscourses.ethz.ch" use SSL certificate from Let’s Encrypt, but isn't configurated to send complete certificate chain, intermediates certificate missed. It will work for chrome (on your computer) because you have successfully visited other websites using Let’s Encrypt, chrome cached the missing intermediates.
you could check this with ssllabs, or:
openssl s_client -showcerts -connect siscourses.ethz.ch:443
Related
I'm trying to use youtube DL with FFmpeg to download an m3u8 stream. Just recently I started receiving this error:
ERROR: Unable to download webpage: <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED]
certificate verify failed: unable to get local issuer certificate (_ssl.c:992)>
(caused by URLError(SSLCertVerificationError(1,
'[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed:
unable to get local issuer certificate (_ssl.c:992)')))
I know Youtube DL supports an option for nocheckcertificate but by enabling this after a couple of minutes the target machine will refuse the connection. When trying to use the same m3u8 stream on another computer, I could download the stream without any issues.
I know that someone from Youtubedl CERTIFICATE_VERIFY_FAILED suggested fixing "your system's CA certificate list". What is the process of doing this?
I tried upgrading/reinstalling python and reinstalling the latest Windows update
I also want to mention that there hasn't been any issue with downloading for the past year but recently stumbled upon this when switching proxy providers. But because the same setup works on another PC without any issue it's probably not the reason.
The system the program is running on is Windows
Edit: Another note is that downloading other public m3u8 streams works perfectly fine, so the problem is probably with the system CA SSL.
I'm on a corporate network I need to use certificates for to get access to certain pages. I've tried looking around online for a module that'll retrieve an HTTPS webpage and also allow me to specify which certificate I want to use. I have this code:
import requests
page = requests.get("https://k9ballistics.com/",'lxml')
thing = page.content
thing = thing.split('\n')
for m in thing:
if '<tr>' in m:
print m
This works on retrieving a normal HTTPS page, but when I try to access our page it throws this error:
requests.exceptions.SSLError: ("bad handshake: Error([('SSL routines', 'tls_process_server_certificate', 'certificate verify failed')],)",)
I was hoping to find a way to do it with a module that already comes with Python as opposed to relying on a pip installed package for portability's sake.
I'm on Windows, but I have my certificates from my linux workstation in a folder I'd like to point to, and also have Ubuntu Bash on Windows.
You can pass verify the path to a CA_BUNDLE file or directory with certificates of trusted CAs:
requests.get('https://eg.com', verify='/path/to/certfile.pem')
or persistent:
s = requests.Session()
s.verify = '/path/to/certfile.pem'
Also you can ignore verifying the SSL certificate by verify=False.
Have a look at SSL Cert Verification to see more details.
I'm running a windows service using python 2.7.9.
As part of it i'm trying to connect to a server using HTTPS.
I'm using requests model (2.7.0) to do it.
I'm also using wincertstore (0.2) model to read windows certificate store and use it as the CA.
the server certificate is singed using an intermediate certificate in the following order -
Root is "Go Daddy Root Certificate Authority - G2"
Intermediate is "Go Daddy Secure Certificate Authority - G2"
The server certificate "*.demoserver.com"
My problem is that the certificate validation fails with the following error - SSLError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:581).
Here is the code i'm using:
import requests
import wincertstore
ca = wincertstore.CertFile()
ca.addcerts('ROOT')
ca.addcerts('CA')
requests.get('https://server.demoserver.com', verify=ca.name)
If I open it on Chrome\Firefox\IE the verification is successful.
I did notice the following behavior:
On a fresh OS, if i open the server using a browser for the first time the intermediate certificate ("Go Daddy Secure Certificate Authority - G2") will be added to Windows certificate store, under that user, under Intermediate Certification Authorities.
If then I will run the code above from a python console the validation will work, since the certificate was added to windows store.
However, since my code is run as a service, and that means using SYSTEM user and local machine store, the certificate won't be there and the validation will fail.
My question is how do I make it work? How can I tell python to check the entire chain, I think it checks the server certificate, sees only one level up (the intermediate certificate), doesn't recognizes it and fails, even though the root certificate is found in the system store also.
I also tried using certifi as the CA which also fails
I want to create a Client/Server architecture following the python documentation.
This works well with my self-signed certificates in one pem file. (ca_root root_key ca_intermediate intermediate_key)
So my next plan is to create client certificates which can be revoked by the server if the client isn't trustworthy anymore.
So the way to go is that i create a certificate, signed with the intermediate key, and hand it out to the client.
But i still get
ssl.SSLError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:590)
Do i need to export the whole certificate chain to the client? This seems odd to me.
Thanks!
Most likely you're entire chain isn't in your .pem file. Just copy the text from the certificates in the right order into a single .pem file and attempt that. If that doesn't work you may be getting this error because of your server configuration. More information is need thought to provide a better answer.
I'm using the following code to interact with a Magento webstore using the XMLRPC api. Magento API Python XMLRPC
Everything was working ok until we made a change on our web server to SSL
Now I'm getting the following error.
ssl.SSLError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:581)
I'm not sure why the certificate is failing as we have an EV certificate and all browsers are showing this as ok.
My connection string is:
How can I resolve this / over-ride the code
I'm fairly new to Python so please go easy :o)
magento = MagentoAPI("www.website.co.uk", 443, "myUsername", "myPassword", "/api/xmlrpc", True)
Python, or better the OpenSSL library it is using, can not verify the validity of the certificate of the server. There are many possible reasons: bad configuration, missing intermediate or CA certificate, wrong CN...
A first step could be to go to this site and let it test the SSL/TLS capabilities of the server: https://www.ssllabs.com/ssltest/
It will give you hints on how to solve problems as well.
Python verifies certs via its own bundle, check where it is located by
>>> import certifi
>>> certifi.where()
'/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/certifi/cacert.pem'
and add your certificates to the end of that file.