GNU Rush
	Restricted User Shell	Sergey Poznyakoff

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9.4 cvs

Using cvs over ssh invokes cvs server on the server machine. In the simplest case, the following rule will do to give users access to CVS repositories:

rule cvs
  match $command ~ "^cvs server"
  set command ~ "s|^cvs|/usr/bin/cvs -f"

However, cvs as of version 1.12.13 does not allow to limit root directories that users are allowed to access. It does have --allow-root option, but unfortunately this option is ignored when invoked as cvs server. To restrict possible roots, we have to run cvs in a chrooted environment. Let’s suppose we created an environment for cvs in directory /var/cvs, with the cvs binary located in /var/cvs/bin and repository root directory being /var/cvs/cvsroot. Then, we can use the following rule:

rule cvs
  match $command ~ "^cvs server"
  set [0] = "/bin/cvs"
  chroot "/var/cvs"