/etc/neutron/rootwrap.d/vpnaas.filters is in neutron-common 1:2014.1.3-0ubuntu1.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | # neutron-rootwrap command filters for nodes on which neutron is
# expected to control network
#
# This file should be owned by (and only-writeable by) the root user
# format seems to be
# cmd-name: filter-name, raw-command, user, args
[Filters]
ip: IpFilter, ip, root
ip_exec: IpNetnsExecFilter, ip, root
openswan: CommandFilter, ipsec, root
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