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Bug 1807686 - Utilization of the RDomain directive in sshd_config causes server to fail all subsequent connections
Summary: Utilization of the RDomain directive in sshd_config causes server to fail all...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: openssh
Version: 8.1
Hardware: Unspecified
OS: Linux
medium
low
Target Milestone: rc
: 8.0
Assignee: Jakub Jelen
QA Contact: Ondrej Moriš
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2020-02-26 22:56 UTC by jcalhoun
Modified: 2021-05-03 07:53 UTC (History)
2 users (show)

Fixed In Version: openssh-8.0p1-5.el8
Doc Type: No Doc Update
Doc Text:
Clone Of:
Environment:
Last Closed: 2020-11-04 01:32:00 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
OpenSSH Project 3126 0 None None None 2020-02-27 09:12:25 UTC
Red Hat Product Errata RHBA-2020:4439 0 None None None 2020-11-04 01:32:10 UTC

Comment 1 Jakub Jelen 2020-02-27 09:12:25 UTC 
The rdomain functionality is in openssh since openssh-7.6p1 so RHEL8 is the first RHEL release bringing this feature. The release notes [1] say that the rdomain keywords are supported also in the match blocks and ListenAddress, which should work also on Linux somehow.

I do not see this option documented in any Red Hat documentation (if you find it somewhere, please, let me know). It would probably make sense to update manual pages to explicitly list this as this work only in OpenBSD and probably make the option no-op in the configuration parsing already. I filled upstream bug with proposed patch.

[1] https://www.openssh.com/releasenotes.html
Comment 2 jcalhoun 2020-02-28 01:12:43 UTC 
Hey Jakub,

Thank you for looking into this. I'll need to do some digging to see if the directive exists in any forward-facing Red Hat documentation, but this mainly arose from the existence of the directive without the specification for OpenBSD in our man pages for sshd_config that shipped with RHEL 8+. It seems you've already addressed this based on your last update. I'll let you know if I end up finding any mention of RDomain outside of the man pages. Thanks again!
Comment 6 Jakub Jelen 2020-03-23 07:22:33 UTC 
Thank you for clarification.
Comment 14 errata-xmlrpc 2020-11-04 01:32:00 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (openssh bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2020:4439
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