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win32: add a method to trigger the Crypto API to complete a certificate chain...
win32: add a method to trigger the Crypto API to complete a certificate chain I started a thread[1] on the mailing list awhile ago, but the short version is that Windows doesn't ship with a full list of certificates[2]. Even if the server sends the whole chain, if Windows doesn't have the appropriate certificate pre-installed in its "Third-Party Root Certification Authorities" store, connections mysteriously fail with: abort: error: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:661) Windows expects the application to call the methods invoked here as part of the certificate verification, triggering a call out to Windows update if necessary, to complete the trust chain. The python bug to add this support[3] hasn't had any recent activity, and isn't targeting py27 anyway. The only work around that I could find (besides figuring out the certificate and walking through the import wizard) is to browse to the site in Internet Explorer. Opening the page with FireFox or Chrome didn't work. That's a pretty obscure way to fix a pretty obscure problem. We go to great lengths to demystify various SSL errors, but this case is clearly lacking. Let's try to make things easier to diagnose and fix. When I had trouble figuring out how to get ctypes to work with all of the API pointers, I found that there are other python projects[4] using this API to achieve the same thing. [1] https://www.mercurial-scm.org/pipermail/mercurial-devel/2017-April/096501.html [2] https://support.microsoft.com/en-us/help/931125/how-to-get-a-root-certificate-update-for-windows [3] https://bugs.python.org/issue20916 [4] https://github.com/nvaccess/nvda/blob/3b86bce2066b1934df14b96f2e83369900860ecf/source/updateCheck.py#L511
Matt Harbison -
r33492:14af0439 default
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Generate a private key (priv.pem):

$ openssl genrsa -out priv.pem 2048

Generate 2 self-signed certificates from this key (pub.pem, pub-other.pem):

$ openssl req -new -x509 -key priv.pem -nodes -sha256 -days 9000 \
-out pub.pem -batch -subj '/CN=localhost/emailAddress=hg@localhost/'
$ openssl req -new -x509 -key priv.pem -nodes -sha256 -days 9000 \
-out pub-other.pem -batch -subj '/CN=localhost/emailAddress=hg@localhost/'

Now generate an expired certificate by turning back the system time:

$ faketime 2016-01-01T00:00:00Z \
openssl req -new -x509 -key priv.pem -nodes -sha256 -days 1 \
-out pub-expired.pem -batch -subj '/CN=localhost/emailAddress=hg@localhost/'

Generate a certificate not yet active by advancing the system time:

$ faketime 2030-01-1T00:00:00Z \
openssl req -new -x509 -key priv.pem -nodes -sha256 -days 1 \
-out pub-not-yet.pem -batch -subj '/CN=localhost/emailAddress=hg@localhost/'

Generate a passphrase protected client certificate private key:

$ openssl genrsa -aes256 -passout pass:1234 -out client-key.pem 2048

Create a copy of the private key without a passphrase:

$ openssl rsa -in client-key.pem -passin pass:1234 -out client-key-decrypted.pem

Create a CSR and sign the key using the server keypair:

$ printf '.\n.\n.\n.\n.\n.\nhg-client@localhost\n.\n.\n' | \
openssl req -new -key client-key.pem -passin pass:1234 -out client-csr.pem
$ openssl x509 -req -days 9000 -in client-csr.pem -CA pub.pem -CAkey priv.pem \
-set_serial 01 -out client-cert.pem

When replacing the certificates, references to certificate fingerprints will
need to be updated in test files.

Fingerprints for certs can be obtained by running:

$ openssl x509 -in pub.pem -noout -sha1 -fingerprint
$ openssl x509 -in pub.pem -noout -sha256 -fingerprint