%r/[a-z0-9]{5}-#{uuid_prefix}-[a-z0-9]{15}/
end
+ def check_readable_uuid attr, attr_value
+ return if attr_value.nil?
+ if (r = ArvadosModel::resource_class_for_uuid attr_value)
+ unless skip_uuid_read_permission_check.include? attr
+ r = r.readable_by(current_user)
+ end
+ if r.where(uuid: attr_value).count == 0
+ errors.add(attr, "'#{attr_value}' not found")
+ end
+ else
+ errors.add(attr, "'#{attr_value}' invalid uuid")
+ end
+ end
+
def ensure_valid_uuids
specials = [system_user_uuid]
next if skip_uuid_existence_check.include? attr
attr_value = send attr
next if specials.include? attr_value
- if attr_value
- if (r = ArvadosModel::resource_class_for_uuid attr_value)
- unless skip_uuid_read_permission_check.include? attr
- r = r.readable_by(current_user)
- end
- if r.where(uuid: attr_value).count == 0
- errors.add(attr, "'#{attr_value}' not found")
- end
- end
- end
+ check_readable_uuid attr, attr_value
end
end
end
protected
+ def check_readable_uuid attr, attr_value
+ if attr == 'tail_uuid' &&
+ !attr_value.nil? &&
+ self.link_class == 'permission' &&
+ attr_value[0..4] != Rails.configuration.ClusterID &&
+ ArvadosModel::resource_class_for_uuid(attr_value) == User
+ # Permission link tail is a remote user (the user permissions
+ # are being granted to), so bypass the standard check that a
+ # referenced object uuid is readable by current user.
+ #
+ # We could do a call to the remote cluster to check if the user
+ # in tail_uuid exists. This would detect copy-and-paste errors,
+ # but add another way for the request to fail, and I don't think
+ # it would improve security. It doesn't seem to be worth the
+ # complexity tradeoff.
+ true
+ else
+ super
+ end
+ end
+
def permission_to_attach_to_objects
# Anonymous users cannot write links
return false if !current_user
head_obj = ArvadosModel.find_by_uuid(head_uuid)
+ if head_obj.nil?
+ errors.add(:head_uuid, "does not exist")
+ return false
+ end
+
# No permission links can be pointed to past collection versions
if head_obj.is_a?(Collection) && head_obj.current_version_uuid != head_uuid
errors.add(:head_uuid, "cannot point to a past version of a collection")