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- ## Note that policy parsing stops at the first match,
- ## so adding anything below "$anyvm $anyvm action" line will have no effect
- ## Please use a single # to start your custom comments
- $anyvm $dispvm allow
- $anyvm $anyvm deny
- # WARNING: The qubes.VMShell service is dangerous and there are really few
- # cases when it could be safely used. Especially when policy set to "ask" you
- # have no way to know for sure what command(s) will be called. Compromissed
- # source VM can substitute the command. Allowing one VM to execute
- # qubes.VMShell over the other VM allows the former to TAKE FULL CONTROL over
- # the later. In most cases this is not what we want!
- #
- # Instead we should be using task-specific qrexec services which provide
- # assurance as to what program will be responding to the (untrusted) VM
- # requests.
- #
- # It is, however, safe, in most cases, to allow ultimate control of the
- # creating AppVM over the DisposableVM it creates as part of the qrexec service
- # invocation. That's why by default we have "$anyvm $dispvm allow" rule. Note
- # that it does _not_ allow any AppVM to execute qubes.VMShell service over any
- # DispVM created in the system -- that would obviously be wrong. It only allows
- # qubes.VMShell service access to the AppVM which creates the DispVM as part of
- # this very service invocation.
- #
- # See e.g. this thread for some discussion:
- # https://groups.google.com/d/msg/qubes-users/xnAByaL_bjI/3PjYdiTDW-0J
- #
- #
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