bugzilla-daemon at bugzilla.mindrot.org
2007-Nov-17 09:47 UTC
[Bug 1392] New: Systems with IPV6_V6ONLY = 0 have unexpected behavior
https://bugzilla.mindrot.org/show_bug.cgi?id=1392
Summary: Systems with IPV6_V6ONLY = 0 have unexpected behavior
Classification: Unclassified
Product: Portable OpenSSH
Version: 4.7p1
Platform: All
OS/Version: Linux
Status: NEW
Severity: minor
Priority: P2
Component: sshd
AssignedTo: bitbucket at mindrot.org
ReportedBy: tsr2600 at gmail.com
Created an attachment (id=1382)
--> (http://bugzilla.mindrot.org/attachment.cgi?id=1382)
turn on IPV6_V6ONLY in sshd before binding for systems that support it
I noticed that sshd on a Linux 2.6.23 system complains when it starts
up:
sshd[6292]: Server listening on :: port 22.
sshd[6292]: error: Bind to port 22 on 0.0.0.0 failed: Address already
in use.
>From what I understand, sshd is operating under the assumption that it
will not accept IPv4 connections on an IPv6 socket and vice versa
(e.g., -4 and -6 options that state that sshd will be forced to use
IPv[46] addresses only).
Currently, if I start sshd with the -6 flag, my expectation is that
sshd will only be able to accept connections over IPv6, but that is not
the case on Linux (v4-mapped addresses get used when a client connects
to an IPv6 socket over IPv4).
The attached patch turns on IPV6_V6ONLY if it is defined before binding
to a socket using AF_INET6. This resolves the bind error that sshd logs
on my system as well as giving users the (in my opinion) expected
behavior for the -6 command line option and Listen options in
sshd_config.
Patch has been tested on Linux 2.6.23, and it is against
openssh-SNAP-20071117
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bugzilla-daemon at bugzilla.mindrot.org
2007-Nov-27 09:15 UTC
[Bug 1392] Systems with IPV6_V6ONLY = 0 have unexpected behavior
https://bugzilla.mindrot.org/show_bug.cgi?id=1392
Gordon <tsr2600 at gmail.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Severity|minor |normal
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bugzilla-daemon at bugzilla.mindrot.org
2008-Jan-19 21:56 UTC
[Bug 1392] Systems with IPV6_V6ONLY = 0 have unexpected behavior
https://bugzilla.mindrot.org/show_bug.cgi?id=1392
Damien Miller <djm at mindrot.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
CC| |djm at mindrot.org
Blocks| |1353
--- Comment #1 from Damien Miller <djm at mindrot.org> 2008-01-20
08:56:32 ---
yes, that makes sense and matches what we already do in channels.c -
applied, thanks!
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bugzilla-daemon at bugzilla.mindrot.org
2008-Mar-31 04:22 UTC
[Bug 1392] Systems with IPV6_V6ONLY = 0 have unexpected behavior
https://bugzilla.mindrot.org/show_bug.cgi?id=1392
Damien Miller <djm at mindrot.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |CLOSED
--- Comment #2 from Damien Miller <djm at mindrot.org> 2008-03-31
15:22:38 ---
Fix shipped in 4.9/4.9p1 release.
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