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Subject:	Re: strange cygwin sshd user generated (user name includes machine name)
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From:	Peter Moore <pmoore AT mozilla DOT com>
In-Reply-To:	<1008ED46-5F9D-4AC3-82AA-C3F1A1069F44@mozilla.com>
Date:	Thu, 31 Mar 2016 21:13:31 +0200
Cc:	Brian Mc George <b DOT mcgeorge AT hotmail DOT com>,
	Ben Stragnell <ben DOT stragnell AT activision DOT com>,
	Jim Leitch <jim DOT leitch AT sunningdale DOT nl>
Message-Id:	<27FD8338-4786-49B5-AF73-554F9DA59FB8@mozilla.com>
References:	<E7EAC5BC-C386-448C-B40D-53A1096374F2 AT mozilla DOT com> <1008ED46-5F9D-4AC3-82AA-C3F1A1069F44 AT mozilla DOT com>
To:	cygwin AT cygwin DOT com

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RESOLVED! =3D)

I=E2=80=99m happy to report Brian McGeorge found a solution, which was kind=
ly passed on to me via Ben Stragnell. The answer is to set the environment =
variable LOGONSERVER to \\%COMPUTERNAME%.

This works by not executing the body of the if statement in: https://cygwin=
.com/git/gitweb.cgi?p=3Dcygwin-csih.git;a=3Dblob;f=3Dcygwin-service-install=
ation-helper.sh;h=3D10ab4fb6d47803c9ffabdde51923fc2c3f0496bb;hb=3D7ca191beb=
b52ae414bb2a2e37ef22d94f2658dc7#l2884

(lines 2884 to 2890)

My working user data now looks like this (note - you need to see both links=
 for context - different parts of the same user data file).

    * https://github.com/taskcluster/generic-worker/blob/b0786db002921d3ec7=
d40053ac2e6799679ab290/worker_types/win2012r2/userdata#L4
    * https://github.com/taskcluster/generic-worker/blob/b0786db002921d3ec7=
d40053ac2e6799679ab290/worker_types/win2012r2/userdata#L81-L101

The addition to the powershell script was simply:

    $env:LOGONSERVER =3D "\\" + $env:COMPUTERNAME

I can confirm this fix works! Thanks again to Brian and Ben. =3D)

Pete



> On 03 Oct 2015, at 20:27, Peter Moore <pmoore AT mozilla DOT com> wrote:
>=20
> After a little bit more digging, I think the cygwin name is coming from t=
he output of getent here:
>=20
> https://cygwin.com/git/gitweb.cgi?p=3Dcygwin-csih.git;a=3Dblob;f=3Dcygwin=
-service-installation-helper.sh;h=3D10ab4fb6d47803c9ffabdde51923fc2c3f0496b=
b;hb=3D7ca191bebb52ae414bb2a2e37ef22d94f2658dc7#l2705
>=20
> At this point, I=E2=80=99m not sure what causes getent to return differen=
t values when run in automation, and when run manually. I wonder if there i=
s some kind of race condition, such that some subsystem is still updating a=
t the point I install cygwin sshd.
>=20
> For reference, this is the powershell script, see lines 77 onwards:
> https://hg.mozilla.org/try/file/4905af7c52e5/testing/taskcluster/worker_t=
ypes/win2012r2/aws_userdata
>=20
> Thanks!
> Pete
>=20
>=20
>=20
>> On 03 Oct 2015, at 19:12, Peter Moore <pmoore AT mozilla DOT com> wrote:
>>=20
>> Hi,
>>=20
>> I have a powershell script for installing cygwin and setting up sshd whi=
ch I am using as UserData when firing up a Windows 2012 R2 instance in AWS =
EC2.
>>=20
>> The same command succeeds when run manually, but fails when called from =
automation. I=E2=80=99m trying to understand what it is that is different, =
so I can fix it in automation.
>>=20
>> The command called is:
>>=20
>> ssh-host-config -y -c 'ntsec mintty' -u 'cygwinsshd' -w 'qwe123QWE!@#'
>>=20
>> When I run manually, logged in as Administrator, I get a log line like t=
his (notice the correct =E2=80=9CCygwin name=E2=80=9D):
>>=20
>> *** Query: Create new privileged user account 'WIN-EFPDIM0SAUP\cygwinssh=
d' (Cygwin name: =E2=80=98cygwinsshd')? (yes/no) yes
>>=20
>> When I run from automation, the log line looks like this (notice the inc=
orrect =E2=80=9CCygwin name=E2=80=9D):
>>=20
>> *** Query: Create new privileged user account 'WIN-EFPDIM0SAUP\cygwinssh=
d' (Cygwin name: 'win-efpdim0saup+cygwinsshd')? (yes/no) yes
>>=20
>> It seems the extended =E2=80=9CCygwin name=E2=80=9D which I get in autom=
ation causes ssh-host-config to fail. I=E2=80=99m trying to establish what =
causes the cygwin name to get the prefix of the machine name, since this se=
ems to cause the problem.
>>=20
>> For reference, below I=E2=80=99ve put the logs in both the successful (m=
anual) case, and the failing (automated) case.
>>=20
>> If anyone can point me to the source code of ssh-host-config I=E2=80=99m=
 also happy to dig - I couldn=E2=80=99t find it online. So if you=E2=80=99r=
e not sure, but know where the source is, I=E2=80=99m happy to look.
>>=20
>> Many thanks in advance!
>> Pete
>>=20
>>=20
>>=20
>> SUCCESSFUL run (when executed manually):
>>=20
>> *** Query: Create new privileged user account 'WIN-EFPDIM0SAUP\cygwinssh=
d' (Cygwin name: =E2=80=98cygwinsshd')? (yes/no) yes
>> *** Info: User =E2=80=98cygwinsshd' has been created with password 'qwe1=
23QWE!@#'.
>> *** Info: If you change the password, please remember also to change the
>> *** Info: password for the installed services which use (or will soon us=
e)
>> *** Info: the =E2=80=98cygwinsshd' account.
>>=20
>> *** Info: The sshd service has been installed under the =E2=80=98cygwins=
shd'
>> *** Info: account.  To start the service now, call `net start sshd' or
>> *** Info: `cygrunsrv -S sshd'.  Otherwise, it will start automatically
>> *** Info: after the next reboot.
>> *** Info: Host configuration finished. Have fun!
>>=20
>>=20
>> FAILED run (when called in automation):
>>=20
>> *** Query: Create new privileged user account 'WIN-EFPDIM0SAUP\cygwinssh=
d' (Cygwin name: 'win-efpdim0saup+cygwinsshd')? (yes/no) yes
>> *** Info: User 'win-efpdim0saup+cygwinsshd' has been created with passwo=
rd 'qwe123QWE!@#'.
>> *** Info: If you change the password, please remember also to change the
>> *** Info: password for the installed services which use (or will soon us=
e)
>> *** Info: the 'win-efpdim0saup+cygwinsshd' account.
>>=20
>> *** Warning: Setting password expiry for user 'win-efpdim0saup+cygwinssh=
d' failed!
>> *** Warning: Please check that password never expires or set it to your =
needs.
>> No user or group 'win-efpdim0saup+cygwinsshd' known.
>> *** Warning: Assigning the appropriate privileges to user 'win-efpdim0sa=
up+cygwinsshd' failed!
>> *** ERROR: There was a serious problem creating a privileged user.
>>=20
>=20


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