def get_permissions
if current_user.andand.can?(manage: @object)
# find all links and return them
- @objects = Link.where(link_class: "permission",
- head_uuid: params[:uuid])
+ @objects = Link.unscoped.where(link_class: "permission",
+ head_uuid: params[:uuid])
@offset = 0
@limit = @objects.count
render_list
protected
def find_object_by_uuid
+ if params[:id] && params[:id].match(/\D/)
+ params[:uuid] = params.delete :id
+ end
if action_name == 'get_permissions'
# get_permissions accepts a UUID for any kind of object.
@object = ArvadosModel::resource_class_for_uuid(params[:uuid])
.readable_by(*@read_users)
.where(uuid: params[:uuid])
.first
- else
+ elsif !current_user
super
- if @object.nil?
- # Normally group permission links are not readable_by users.
- # Make an exception for users with permission to manage the group.
- # FIXME: Solve this more generally - see the controller tests.
- link = Link.find_by_uuid(params[:uuid])
- if (not link.nil?) and
- (link.link_class == "permission") and
- (@read_users.any? { |u| u.can?(manage: link.head_uuid) })
- @object = link
- end
+ else
+ # The usual permission-filtering index query is unnecessarily
+ # inefficient, and doesn't match all permission links that
+ # should be visible (see #18865). Instead, we look up the link
+ # by UUID, then check whether (a) its tail_uuid is the current
+ # user or (b) its head_uuid is an object the current_user
+ # can_manage.
+ link = Link.unscoped.where(uuid: params[:uuid]).first
+ if link && link.link_class != 'permission'
+ # Not a permission link. Re-fetch using generic
+ # permission-filtering query.
+ super
+ elsif link && (current_user.uuid == link.tail_uuid ||
+ current_user.can?(manage: link.head_uuid))
+ # Permission granted.
+ @object = link
+ else
+ # Permission denied, i.e., link is invisible => 404.
+ @object = nil
end
end
end
super
# head_kind and tail_kind columns are now virtual,
- # equivilent functionality is now provided by
+ # equivalent functionality is now provided by
# 'is_a', so fix up any old-style 'where' clauses.
if @where
@filters ||= []
super
# head_kind and tail_kind columns are now virtual,
- # equivilent functionality is now provided by
+ # equivalent functionality is now provided by
# 'is_a', so fix up any old-style 'filter' clauses.
@filters = @filters.map do |k|
if k[0] == 'head_kind' and k[1] == '='
k
end
end
+
+ # If the provided filters are enough to limit the results to
+ # permission links with specific head_uuids or
+ # tail_uuid=current_user, bypass the normal readable_by query
+ # (which doesn't match all can_manage-able items, see #18865) --
+ # just ensure the current user actually has can_manage permission
+ # for the provided head_uuids, removing any that don't. At that
+ # point the caller's filters are an effective permission filter.
+ if @filters.include?(['link_class', '=', 'permission'])
+ @filters.map do |k|
+ if k[0] == 'tail_uuid' && k[1] == '=' && k[2] == current_user.uuid
+ @objects = Link.unscoped
+ elsif k[0] == 'head_uuid'
+ if k[1] == '=' && current_user.can?(manage: k[2])
+ @objects = Link.unscoped
+ elsif k[1] == 'in'
+ # Modify the filter operand element (k[2]) in place,
+ # removing any non-permitted UUIDs.
+ k[2].select! do |head_uuid|
+ current_user.can?(manage: head_uuid)
+ end
+ @objects = Link.unscoped
+ end
+ end
+ end
+ end
end
end
projects / arvados.git / blobdiff