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qrexec: document new 'ask' action behaviour and 'default_target=' option

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Marek Marczykowski-Górecki 2017-12-13 03:08:37 +01:00
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services/qrexec3.md
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@ -201,6 +201,26 @@ Target VM can be also specified as `$default`, which matches the case when
calling VM didn't specified any particular target (either by using `$default`
target, or empty target).
In Qubes 4.0 policy confirmation dialog (`ask` action) allow the user to
specify target VM. User can choose from VMs that, according to policy, would
lead to `ask` or `allow` actions. It is not possible to select VM that policy
would deny. By default no VM is selected, even if the caller provided some, but
policy can specify default value using `default_target=` parameter. For
example:
work-mail work-archive allow
work-mail $tag:work ask,default_target=work-files
work-mail $default ask,default_target=work-files
The first rule allow call from `work-mail` to `work-archive`, without any
confirmation.
The second rule will ask the user about calls from `work-mail` VM to any VM with
tag `work`. And the confirmation dialog will have `work-files` VM chosen by
default, regardless of the VM specified by the caller (`work-mail` VM). The
third rule allow the caller to not specify target VM at all and let the user
choose, still - from VMs with tag `work` (and `work-archive`, regardless of
tag), and with `work-files` as default.
### Service argument in policy
Sometimes just service name isn't enough to make reasonable qrexec policy. One