SSHClient: fix the host key test (2.1) #1058
Aug 1, 2017
Skip the host key check only, if the transport actually used gssapi-keyex. Add tests for the missing-host-key RejectPolicy. Before this change, a man-in-the-middle attack on the paramiko ssh client with gss_kex=True was possible by having a server that does not support gssapi-keyex and gives any or no host key.
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