limit certain ports to be forwarded through ssh account..

[Eric Persson <eric@persson.tm>]

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Hi,

I'm interested in allowing a few selected users forward their imap/smtp
traffic over ssh. But I also want to prevent them from doing anything
but that, they shouldnt be able to forward any ports, or get a shell at
all, just some certain predefined ports.
Is this possible with openssh or any other sshd?

/eric
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