Hi all, First time posting here so please be gentle ;-) TL;DR: After a failed handshake, caused by our peer’s certificate failing verification, what is the correct way to get hold of the peer’s certificate? A little more detail: I’d like my server applications to be able to log some details about the client’s certificate after a failed handshake, such as CN, SAN, not-valid-before,
and not-valid-after values. So, after a failed handshake, I thought should be able to call SSL_get_peer_certificate(), however I’m using python (:-) bear with me…) where in the guts
of SSLSocket.getpeercert() the call to SSL_get_peer_certificate() isn’t even attempted if SSL_is_init_finished() is false.[1] Is SSL_is_init_finished() too severe a check in this case, and SSL_get_peer_certificate() would actually work fine?
More detail, in case it is relevant: We have an internal CA, and both the server and client have certificates signed by this CA, and both trust the CA’s certificate. The SSLContexts on both sides have: * verify flags = SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT * certificate store verify flags = X509_V_FLAG_TRUSTED_FIRST | X509_V_FLAG_X509_STRICT Any help would be greatly appreciated. Best wishes, Steven. [1]
https://github.com/python/cpython/blob/3.7/Modules/_ssl.c#L1813
You'll have better luck getting the peer certificate *during* the handshake, not after. Thanks for the pointer! Python’s standard ssl module doesn’t expose that callback (yet), and I’d rather not switch everything to PyOpenSSL, but I’ll see what I can
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