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From: Stephen Paul Carrier <carrier@berkeley.edu>
Date: Wed, 6 Mar 2019 15:44:36 -0800
To: cygwin@cygwin.com
Subject: Re: sshd problem on WS2008R2 64bit
Message-ID: <20190306234436.GA3085@zebra>
References: <20190306124816.GR3785@calimero.vinschen.de> <20190306141716.GS3785@calimero.vinschen.de> <20190306143424.GU3785@calimero.vinschen.de> <CANV9t=SHLCT_xN_T35qTgJmoEBu98gGPaKjHMt559MZ+AwyToQ@mail.gmail.com> <20190306153404.GX3785@calimero.vinschen.de> <CANV9t=QiOH4cB47XzKZsReH7RLdaB0CxgY-o3jYgZ46DbV3OdA@mail.gmail.com> <20190306201331.GB3785@calimero.vinschen.de> <CANV9t=RtsR8+KZ68QirxfiU9w_sGk9QnQejEyJVeBcrdiuOq0w@mail.gmail.com> <20190306205931.GC3785@calimero.vinschen.de> <CANV9t=SEj2CpNNp-OzoKQ0nJ-qPN-9_7_8ELBpCCBGDH0FUOzw@mail.gmail.com>
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User-Agent: Mutt/1.9.1 (2017-09-22)

On Wed, Mar 06, 2019 at 02:24:59PM -0700, Bill Stewart wrote:
...   
> For my part, I'm writing a PowerShell script that does the following:
> 
> 1) Create a local user account
> 2) Grant it SeBatchLogonRight
> 3) Create a scheduled task for it

Powershell is probably more elegant if you're familiar with it, but I
found this bash sequence that does the trick:

-----
PW=`dd if=/dev/random bs=15 count=1 | base 64`
net user s4udummy /add
net user s4udummy $PW
wmic USERACCOUNT WHERE NAME=\'s4udummy\' SET PasswordExpires=FALSE

/usr/bin/editrights -u s4udummy -a SeBatchLogonRight
schtasks /create /tn wake-s4u /sc ONSTART /ru s4udummy /rp $PW \
         /tr '"$SYSTEMROOT"\\System32\\cmd.exe /c exit'
sc config cron depend= Schedule
-----

I added the last statement, to make cron dependent on the Task Scheduler,
because my crontabs use '@reboot' and I am worried about cron trying
to spawn an important job before the Task Scheduler has a chance to
fix seteuid().

The dependency isn't logically sufficient as wake-s4u job needs some
time to finish.  But its working so far.  I can configure cron to start
with a delay should Task Scheduler ever lose the race.

Thanks everyone for quick attention to this problem and the workaround!

--Stephen

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