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ssh issues

From: Simon McClenahan <smcclenahan_at_healthcompartners.com>
Date: 2004-02-24 00:53:43 CET

We are using svn+ssh protocol to access a repository, and every so often I get a corrupt database error due to the fact that the BDB log files are not writable. A previous poster describes as follows:

> -----Original Message-----
> From: Pete Gonzalez [mailto:pgonzalez@bluel.com]
> Sent: Wednesday, January 14, 2004 8:02 PM
> To: users@subversion.tigris.org
> Subject: Suggestion for FAQ

> And when that was all working, I discovered a new problem: The
> tunneled svn commands are running with the user account permissions,
> which means the Berkeley database files need writeable group flags
> or some such. This completely defeats the svn permissions, since e.g.
> a user could just copy the entire Berkeley database directly. And
> so I found some docs about writing setuid wrappers for the svn
> commands etc.

I also had the issue where I have Subversion installed in a non-standard place, and the path cannot be changed for the SSH login, so I had to create a symbolic link /usr/local/bin/svnserve to get it to work for the users

Then Perry Metzger started a thread regarding security and setuid/setgid, and a comment was made:

> -----Original Message-----
> From: Travis P [mailto:svn@castle.fastmail.fm]
> Sent: Friday, February 13, 2004 1:22 PM
> To: Garrett Rooney
> Cc: Brian Mathis; users@subversion.tigris.org; Perry E. Metzger
> Subject: Re: a few nits setting up svn...

> As Perry noticed, both use svnserve. Brian's point is that the two
> methods that are causing confusion use it in different ways.
> 1) svn+ssh:// User tunnels to server and as himself runs
> svnserve *as
> himself*. As mentioned many times, this is equivalent to file://
> access.
> 2) Alternative method that uses the same components in a
> different way:
> ssh tunnel with svn:// access via svnserve (which is configured to
> allow localhost only connections). User tunnels to server and the
> opens a network connection to svnserve which performs the
> action on the
> user's behalf *with the permissions of the svnserve daemon.* This
> alternative method achieves the setuid feature that Perry desires.

My question is: what is the best way to set up svn+ssh access? I raised the issue because I got file permission problems with BDB, but apparently there are security issues as well (although I don't have the Subversion machine accessible through the Internet ... yet). Is svn: through SSH tunnel the best? Can I "fix" the BDB file ownership problem with setuid/setgid wrappers? Eventually I will go to http: access, but svn+ssh: is the only thing that works for me right now. Step-by-step instructions would be helpful :-)

- Simon

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Received on Tue Feb 24 00:53:45 2004

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