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sshd implementation in Go, for the sole purpose of restricting the ports that clients can request using direct-tcpip and tcpip-forward / forwarded-tcpip.
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go-sshd/README.rst

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Add go-sshd, the ssh restrictive port-forwarder
7 years ago
Motivation
==========
sshd implementation in Go, for the sole purpose of restricting the ports that
Remove global state, refactoring
7 years ago
clients can request using direct-tcpip and tcpip-forward / forwarded-tcpip.
Add go-sshd, the ssh restrictive port-forwarder
7 years ago
OpenSSH refuses to merge patches to support this, but there is a fork of OpenSSH
with patches that achieve something similar to this. [1]
[1] https://github.com/antonyantony/openssh
authorized_keys format
======================
Same as OpenSSH authorized_keys format.
Ports in options instead of comment field
7 years ago
The options field contains the ports that are allowed to be forwarded, colon separated::
Add go-sshd, the ssh restrictive port-forwarder
7 years ago
Ports in options instead of comment field
7 years ago
ports=3333:4444 ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIHPWEWu85yECrbmtL38wlFua3tBSqxTekCX/aU+dku+w COMMENTHERE