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Bug 1584774

Summary:	Please backport the patch that consumes all output from the authorizedkeys helper binary
Product:	Red Hat Enterprise Linux 7	Reporter:	Jakub Hrozek <jhrozek>
Component:	openssh	Assignee:	Jakub Jelen <jjelen>
Status:	CLOSED WONTFIX	QA Contact:	BaseOS QE Security Team <qe-baseos-security>
Severity:	unspecified	Docs Contact:
Priority:	medium
Version:	7.6	CC:	mgrepl, nmavrogi
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-02-11 15:41:49 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Jakub Hrozek 2018-05-31 15:38:55 UTC

Description of problem:
(This bug is filed on request of Jakub Jelen after we had a private e-mail discussion)

Since 7.5, openssh contains a patch that closes its end of the pipe towards the authorizedkeys helper when a matching key is found even before the authorizedkeys helper finishes writing all its output. But this might send a SIGPIPE to the authorizedkeys helper if it is not prepared to handle this situation.

Jakub pointed me to upstream commit https://github.com/openssh/openssh-portable/commit/52763dd and an upstream bug https://bugzilla.mindrot.org/show_bug.cgi?id=2655 which try to address this by reading the entire output

Even though we will most probably patch SSSD in RHEL-7.5 to make it robust and survive SIGPIPE, maybe it would increase the robustness of openssh in RHEL to backport this patch as well.

Comment 2 Simo Sorce 2019-02-11 15:41:49 UTC

This issue was not selected to be included either in Red Hat Enterprise Linux 7.7 because it is seen either as low or moderate impact to a small amount of use-cases. The next release will be in Maintenance Support 1 Phase, which means that qualified Critical and Important Security errata advisories (RHSAs) and Urgent Priority Bug Fix errata advisories (RHBAs) may be released as they become available. We will now close this issue, but if you believe that it qualifies for the Maintenance Support 1 Phase, please re-open; otherwise we recommend moving the request to Red Hat Enterprise Linux 8 if applicable.