Plugin to remove Trac permissions using a blacklist and/or a whitelist.
This hack was born to be able to archive projects without touching the Trac database, the idea is to use the filter to disable all permissions that allow users to modify it without changing their permissions on the database and be able to restore the project to the original state simply disabling the filter.
To filter permissions as desired the plugin has to be the first one on the permission_policy list and it works by checking the permissions against the blacklist and the whitelist in that order (if a permission is in both lists it is blacklisted).
The process is as follows:
- If the blacklist is available and the permission being considered is on the list the check_permission function returns False and the permission evaluation stops.
- If the whitelist is available and the permission we are checking is not on the list the check_permission function returns False and the permission evaluation stops.
- If the evaluation gets here the permission is ignored by the plugin and the next permission policy is checked.
If the boolean option adminmeta is True the filters are ignored for users with TRAC_ADMIN permission.
If you have any issues, create a new ticket.
Download the zipped source from here.
After enabling the plugin in your trac.ini:
tracpermissionfilter.* = enabled
Add a section with the list of permissions to allow:
[permission-filter] whitelist = BROWSER_VIEW,CHANGESET_VIEW,FILE_VIEW,LOG_VIEW,MILESTONE_VIEW,REPORT_SQL_VIEW,REPORT_VIEW,ROADMAP_VIEW,SEARCH_VIEW,TICKET_VIEW,TIMELINE_VIEW,WIKI_VIEW
or a list of permissions to deny:
[permission-filter] blacklist = BROWSER_VIEW
The use of the two lists (black and white) makes sense when using inheritance, to avoid repeating long lists (i. e., we can have a long whitelist and reduce it only in one project using the blacklist).
The plugin has also an additional boolean option called adminmeta. If this option is set to True (the default) the filters don't affect the users with TRAC_ADMIN permission:
[permission-filer] adminmeta = true
If the variable is set to False filtering has odd effects on users with TRAC_ADMIN permission because we reject based on action name and TRAC_ADMIN is a meta permission that usually is not checked directly
Lastly, remember to put the filter the first on your project permission_policies:
[trac] permission_policies = PermissionFilter, DefaultPermissionPolicy