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Date:	Mon, 5 Jan 2015 08:25:51 +0300
From:	Andrey Repin <anrdaemon AT yandex DOT ru>
Reply-To:	cygwin AT cygwin DOT com
Message-ID:	<516597488.20150105082551@yandex.ru>
To:	"The Sec Maestro" <thesecmaestro AT gmail DOT com>, cygwin AT cygwin DOT com
Subject:	Re: SSH login to cygwin sshd (6.7p1-1) fails with error seteuid1000: Operation not permitted when ~/.ssh/id_rsa keys available on client
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Greetings, The Sec Maestro!

> SSH Login, using 'tester' account (in Adminstrators group) to the Cygwin
> sshd server fails from a client machine which has ~/.ssh/id_rsa keys
> available.

Check permissions on the ~/.ssh directory and subsequent files. ssh is VERY
picky about them.
Both standard POSIX and ACL permissions.
Use setfacl -b option if necessary to strip unwanted extra ACE's.

> Login from the same client, without the id_rsa keys is successful. SSH
> locally (on cygwin box) is also successful.

> Comparison of the sshd logs (debugging enabled) of a good vs failure login
> shows that when id_rsa is enabled on the client, the following in the
> failure case:  

> debug1: temporarily_use_uid: 1000/513 (e=18/544)
> seteuid 1000: Operation not permitted

> This seem to be related to a permission related problem, but cygcheck_output
> though shows the 'tester' user is member of Administrators group.

> What am I missing?


--
WBR,
Andrey Repin (anrdaemon AT yandex DOT ru) 05.01.2015, <08:23>

Sorry for my terrible english...


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