Find attached a patch that allows socks connections with GSSAPI
authentication to the socks proxy. Encryption is not implemented as in most
cases it does not add any benefit, since users will use sftp or ftps anyway,
but authentication is very useful to be user dependant instead of src IP
dependant on the socks proxy.

I also added an option --socks5-gssapi-service to change the Kerberos
service name from the default rcmd to something else. I tested against the
NEC reference implementation.

Markus

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