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From: "Matt D." <codespunk@gmail.com>
Subject: Re: No way to use ssh ~/.ssh/config with "noacl" option
To: cygwin@cygwin.com
References: <59FD8C99.8010703@gmail.com> <20171104113723.GC18070@calimero.vinschen.de> <59FDA8D9.6050808@gmail.com> <59FDC12F.1080005@codespunk.com> <59FDDCFA.9030306@codespunk.com> <20171104163701.GA23538@calimero.vinschen.de> <59FDF754.4040505@gmail.com> <59FDFB25.8060409@gmail.com>
Message-ID: <5A038E3C.60908@codespunk.com>
Date: Wed, 8 Nov 2017 18:07:40 -0500
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On 11/4/2017 1:38 PM, Matt D. wrote:
> On 11/4/2017 1:15 PM, Matt D. wrote:
>  > On 11/4/2017 11:43 AM, Achim Gratz wrote:
>  >> That's the correct thing to do, even though you made this unnecessarily
>  >> hard for yourself by mounting your home directory with "noacl".
>  >
>  > It's not perfect but I've always had trouble with all of the
>  > modifications Cygwin makes to a file's permissions to support
>  > POSIX-style ACLs. I do miss being able to manage them with chmod and
>  > setfacl though.
>  >
>  > For those wishing to set their ssh config to 600 (as recognized by
>  > Cygwin's ssh), use the following:
>  >
>  > Reset file permissions:
>  >    icacls config /t /q /c /reset
>  >
>  > Inheritence must be disabled to alter other groups:
>  >    icacls config /inheritance:d
>  >
>  > Effectively regarded as "group":
>  >    icacls config /remove:g "Authenticated Users"
>  >    icacls config /remove:g "Users"
>  >
>  > Regarded as "other":
>  >    icacls config /remove:g "Everyone"
>  >
>  > Add the current user as the owner:
>  >    icacls config /grant "%USERNAME%:rw"
>  >
>  >
>  > Matt D.
>
> My previous reply was missing "takeown" to take ownership. The correct
> sequence of commands is:
>
> icacls config /t /q /c /reset
> icacls config /inheritance:d
> takeown /f config
> icacls config /remove:g "Authenticated Users"
> icacls config /remove:g "Users"
> icacls config /remove:g "Everyone"
> icacls config /grant "%USERNAME%:rw"
>
> This is equivalent to "chmod 600 config".
>
>
> Matt D.

Here is a more portable version of taking ownership and setting 
permissions to 600. It uses SIDs instead of literal names which may vary 
between locale:

icacls "id_rsa" /t /q /c /reset
icacls "id_rsa" /inheritance:d
takeown /f "id_rsa"
icacls "id_rsa" /remove *S-1-5-11
icacls "id_rsa" /remove *S-1-5-32-545
icacls "id_rsa" /remove *S-1-1-0
icacls "id_rsa" /grant "%USERNAME%:rw"

S-1-5-11 (Authenticated Users group)
S-1-5-32-545 (Users group)
S-1-1-0 (Everyone group)


Matt D.

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