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From:	Karl M <karlm30 AT hotmail DOT com>
To:	<cygwin AT cygwin DOT com>
Subject:	RE: chmod problem
Date:	Thu, 5 Apr 2012 05:19:35 -0700
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> Date: Thu, 5 Apr 2012 11:46:07 +0200
> From: corinna
> To: cygwin
> Subject: Re: chmod problem
> 
> On Apr 4 13:16, Karl M wrote:
> > 
> > 
> > Hi All...
> > 
> > 
> > On a recent Cygwin install on a new win7-64 machine, I ran into a problem. The ssh service would not start because the protection on the /etc/ssh_host_rsa_key was too weak. (I use only the rsa host key.)
> > 
> > If I chmod the file to 600, all is well. But...if I do it within a shell script, the chmod has no effect. Below is a short test case and a bash -x run of the script?
> > 
> > 
> > $ cat test-config
> > chown administrators /etc/ssh*
> > ls -al /etc/ssh_host_rsa_key
> > chmod -v 600 /etc/ssh_host_rsa_key
> > ls -al /etc/ssh_host_rsa_key
> > 
> > 
> > $ bash -x test-config
> > + chown administrators /etc/ssh_host_rsa_key /etc/ssh_host_rsa_key.pub /etc/sshd_config
> > + ls -al /etc/ssh_host_rsa_key
> > -rw-rw---- 1 Administrators root 1675 Apr 4 11:30 /etc/ssh_host_rsa_key
> > + chmod -v 600 /etc/ssh_host_rsa_key
> > mode of `/etc/ssh_host_rsa_key' changed from 0660 (rw-rw----) to 0600 (rw-------)
> > + ls -al /etc/ssh_host_rsa_key
> > -rw-rw---- 1 Administrators root 1675 Apr 4 11:30 /etc/ssh_host_rsa_key
> > 
> > This test was on a fresh (1.7.12) from this morning.
> 
> There's your problem: The Administrators group and the root group
> are just two different Cygwin group names for the same Windows group
> with SID S-1-5-32-544. So, the above POSIX permissions are a result
> of the SID S-1.5.32.544 having rw- permissions.
> 
> Apart from that, the owner of the /etc/ssh* files should be cyg_server,
> not the admins group.
> 
I name my cyg_server user root.

 

But my testcase was demonstrating that chmod thought it changed the file permissions but had no effect when performed in a script. While when performed interactively at the bash command prompt, chmod worked fine.

 

...Karl 		 	   		  

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