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.
Related
I am trying to retrieve certificate data using Python 3.11.0 on Windows using the ssl.create_default_context command.
While it does retrieve some certificates, it doesn't retrieve all of them. For example, I added a new Go-Daddy ssl certificate to the Certificate Snap-In of the MMC, specifically to the "Trusted Root Certificate Authority" section, since I saw the ssl.create_default_context command pulls existing certificates from there.
After adding said certificate and running the following lines of code:
certs = ssl.create_default_context().get_ca_certs(binary_form=True)
pem_certs = [ssl.DER_cert_to_PEM_cert(der) for der in certs]
I'm getting a list of certificates, but it doesn't include the new certificate I manually added.
I tried to read the command configuration but didn't find any flag that could help me retrieve any extra certificates with this command.
Any help would be greatly appreciated, thanks!
I am running a docker container with Ubuntu as the base and am trying to add a new Certificate Authority to the project.
I'm not entirely sure what's failing, but I cannot seem to make it work. I followed the directions on this page: http://manpages.ubuntu.com/manpages/zesty/man8/update-ca-certificates.8.html by adding the CA file to a directory in /usr/share/ca-certificates, specifying the CA files in /etc/ca-certificates.conf, and then running update-ca-certificates, which completes with a message saying that it added 3 new certificates.
However, aiohttp is still printing the error
aiohttp.errors.ClientOSError: [Errno 1] Cannot connect to host www.myserver.com:443 ssl:True [Can not connect to www.myserver.com:443 [[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:719)]]
I was informed that aiohttp doesn't access a certificate store itself, but rather relies on asyncio which I think was absorbed into python itself recently. So I don't know if somewhere along the chain something is using a different certificate store, but I would just like to know where I can add my CA files so that they will work with aiohttp.
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'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.
Question
How can I verify that an X.509 certificate is signed by another certificate using PyOpenSSL or Twisted? I want a client to verify that the received server certificate is the one that signed its client certificate.
I've looked through the PyOpenSSL documentation and can't seem to find anything on how to verify a certificate separately from the establishing the SSL connection.
I found a reference to OpenSSL.crypto:X509.verify() in twisted.internet._sslverify:PublicKey.verifyCertificate() , but the twisted method is commented out (in Twisted 13.0) and the X509 method does not exist (in PyOpenSSL 0.13).
pyOpenSSL has no support for verifying a certificate describes a bug for not being able to manually verify a certificate chain, but I'm not entirely sure if that's what I'm trying to do.
Use Case
Certificates:
Generated self-signed CA certificate with openssl.
Generated server certificate signed by CA certificate.
Generated client certificate signed by server certificate.
Setup:
The server is using Twisted's CertificateOptions with its server cert. The CA certs are the CA and server certs to setup a chain where the server cert verifies the received client cert, and the CA cert verifies the server cert (all built-in functionality).
The client is also using CertificateOptions for the client cert. The CA certs only contains the CA cert.
This all works fine (both sides verify each other) but I want to perform an additional step:
In the client set_verify() callback, verify that the client cert is signed by the server cert.
You should be able to do it with something like written here:
http://www.yothenberg.com/validate-x509-certificate-in-python/
which is basically:
load your certificates in PyOpenSSL with load_certificate()
create a X509Store() object
use add_cert() to add your intermediate certificate in the store
create a X509StoreContext() object, initializing it with both your store object and your end certificate
call verify_certificate() on your store context object
In practice, I was unable to make that part, and I think it is for the reasons explained here: https://mail.python.org/pipermail/cryptography-dev/2016-August/000676.html
In short, even in 2016, there still does not seem to be a correct wait to check certificates in PyOpenSSL, which is very sad. Note that the consensus seem to be that if you operate inside a TLS connection, the things are better checked by the connection routine instead of offline through check_certificate()