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From: Peter Moore <pmoore AT mozilla DOT com>
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Subject: strange cygwin sshd user generated (user name includes machine name)
Date: Sat, 3 Oct 2015 19:12:47 +0200
Message-Id: <E7EAC5BC-C386-448C-B40D-53A1096374F2@mozilla.com>
To: cygwin AT cygwin DOT com
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Hi,

I have a powershell script for installing cygwin and setting up sshd which =
I am using as UserData when firing up a Windows 2012 R2 instance in AWS EC2.

The same command succeeds when run manually, but fails when called from aut=
omation. I=E2=80=99m trying to understand what it is that is different, so =
I can fix it in automation.

The command called is:

ssh-host-config -y -c 'ntsec mintty' -u 'cygwinsshd' -w 'qwe123QWE!@#'

When I run manually, logged in as Administrator, I get a log line like this=
 (notice the correct =E2=80=9CCygwin name=E2=80=9D):

*** Query: Create new privileged user account 'WIN-EFPDIM0SAUP\cygwinsshd' =
(Cygwin name: =E2=80=98cygwinsshd')? (yes/no) yes

When I run from automation, the log line looks like this (notice the incorr=
ect =E2=80=9CCygwin name=E2=80=9D):

*** Query: Create new privileged user account 'WIN-EFPDIM0SAUP\cygwinsshd' =
(Cygwin name: 'win-efpdim0saup+cygwinsshd')? (yes/no) yes

It seems the extended =E2=80=9CCygwin name=E2=80=9D which I get in automati=
on causes ssh-host-config to fail. I=E2=80=99m trying to establish what cau=
ses the cygwin name to get the prefix of the machine name, since this seems=
 to cause the problem.

For reference, below I=E2=80=99ve put the logs in both the successful (manu=
al) case, and the failing (automated) case.

If anyone can point me to the source code of ssh-host-config I=E2=80=99m al=
so happy to dig - I couldn=E2=80=99t find it online. So if you=E2=80=99re n=
ot sure, but know where the source is, I=E2=80=99m happy to look.

Many thanks in advance!
Pete


SUCCESSFUL run (when executed manually):

*** Query: Create new privileged user account 'WIN-EFPDIM0SAUP\cygwinsshd' =
(Cygwin name: =E2=80=98cygwinsshd')? (yes/no) yes
*** Info: User =E2=80=98cygwinsshd' has been created with password 'qwe123Q=
WE!@#'.
*** Info: If you change the password, please remember also to change the
*** Info: password for the installed services which use (or will soon use)
*** Info: the =E2=80=98cygwinsshd' account.

*** Info: The sshd service has been installed under the =E2=80=98cygwinsshd'
*** 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!


FAILED run (when called in automation):

*** Query: Create new privileged user account 'WIN-EFPDIM0SAUP\cygwinsshd' =
(Cygwin name: 'win-efpdim0saup+cygwinsshd')? (yes/no) yes
*** Info: User 'win-efpdim0saup+cygwinsshd' has been created with password =
'qwe123QWE!@#'.
*** Info: If you change the password, please remember also to change the
*** Info: password for the installed services which use (or will soon use)
*** Info: the 'win-efpdim0saup+cygwinsshd' account.

*** Warning: Setting password expiry for user 'win-efpdim0saup+cygwinsshd' =
failed!
*** Warning: Please check that password never expires or set it to your nee=
ds.
No user or group 'win-efpdim0saup+cygwinsshd' known.
*** Warning: Assigning the appropriate privileges to user 'win-efpdim0saup+=
cygwinsshd' failed!
*** ERROR: There was a serious problem creating a privileged user.


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