Some more details. Here's a part of my sslh config:
listen:
(
{ host: "0.0.0.0"; port: "443"; },
{ host: "::"; port: "443"; }
);
And here's how it's working:
# ss -tlnp | grep sslh
LISTEN 0 50 0.0.0.0:443 0.0.0.0:*
users:(("sslh-fork",pid=2557,fd=3),("sslh-fork",pid=2556,fd=3),("sslh-fork",pid=2551,fd=3))
LISTEN 0 50 [::]:443 [::]:*
users:(("sslh-fork",pid=2557,fd=4),("sslh-fork",pid=2556,fd=4),("sslh-fork",pid=2551,fd=4))
You can see that it's listening on both 0.0.0.0 and [::] interfaces.
Now here's a piece of my sshd_config:
AddressFamily any
ListenAddress 0.0.0.0
ListenAddress ::
And here's how it's working:
# ss -tlnp | grep sshd
LISTEN 0 8192 [::]:22 [::]:*
users:(("sshd",pid=843,fd=3),("systemd",pid=1,fd=69))
As you can see, it doesn't listen on IPv4 interface at all.
This is clearly a packaging bug because only precompiled binaries are
affected. My sslh binary compiled under Ubuntu 22.04 was doing the same
and was fixed once I compiled it under Ubuntu 24.04.
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https://bugs.launchpad.net/bugs/2080216
Title:
sshd cannot bind to IPv4 interfaces
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