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
Status in openssh package in Ubuntu:
Confirmed
Bug description:
After upgrading from 22.04 to 24.04 I noticed that my sshd only
listening on IPv6 interface (::), while previously it was listening
both IPv4 (0.0.0.0) and IPv6 (::). I tried to explicitly specify
ListenAddress 0.0.0.0 (assuming it would bind to IPv4 only) but after
restart sshd was still listening on IPv6 only.
This problem affects other packages as well, for example, openvpn.
Rebuilding applications from sources seems to fix the issue.
Setting net.ipv6.bindv6only=0 also helps, but that's not a solution.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: openssh-server 1:9.6p1-3ubuntu13.5
ProcVersionSignature: Ubuntu 6.8.0-41.41-generic 6.8.12
Uname: Linux 6.8.0-41-generic x86_64
ApportVersion: 2.28.1-0ubuntu3.1
Architecture: amd64
CasperMD5CheckResult: unknown
Date: Tue Sep 10 16:45:54 2024
ProcEnviron:
LANG=C.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=screen.xterm-256color
SourcePackage: openssh
UpgradeStatus: Upgraded to noble on 2024-09-10 (0 days ago)
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