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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2016-2020 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package builtin
const firewallControlSummary = `allows control over network firewall`
const firewallControlBaseDeclarationSlots = `
firewall-control:
allow-installation:
slot-snap-type:
- core
deny-auto-connection: true
`
// http://bazaar.launchpad.net/~ubuntu-security/ubuntu-core-security/trunk/view/head:/data/apparmor/policygroups/ubuntu-core/16.04/firewall-control
const firewallControlConnectedPlugAppArmor = `
# Description: Can configure firewall. This is restricted because it gives
# privileged access to networking and should only be used with trusted apps.
#include <abstractions/nameservice>
/run/systemd/resolve/stub-resolv.conf rk,
# systemd-resolved (not yet included in nameservice abstraction)
#
# Allow access to the safe members of the systemd-resolved D-Bus API:
#
# https://www.freedesktop.org/wiki/Software/systemd/resolved/
#
# This API may be used directly over the D-Bus system bus or it may be used
# indirectly via the nss-resolve plugin:
#
# https://www.freedesktop.org/software/systemd/man/nss-resolve.html
#
#include <abstractions/dbus-strict>
dbus send
bus=system
path="/org/freedesktop/resolve1"
interface="org.freedesktop.resolve1.Manager"
member="Resolve{Address,Hostname,Record,Service}"
peer=(name="org.freedesktop.resolve1"),
capability net_admin,
/{,usr/}{,s}bin/iptables{,-save,-restore} ixr,
/{,usr/}{,s}bin/ip6tables{,-save,-restore} ixr,
/{,usr/}{,s}bin/iptables-apply ixr,
/{,usr/}{,s}bin/xtables{,-legacy,-nft}-multi ixr, # ip[6]tables*
# ping - child profile would be nice but seccomp causes problems with that
/{,usr/}{,s}bin/ping ixr,
/{,usr/}{,s}bin/ping6 ixr,
capability net_raw,
capability setuid,
network inet raw,
network inet6 raw,
# iptables (note, we don't want to allow loading modules, but
# we can allow reading @{PROC}/sys/kernel/modprobe).
@{PROC}/sys/kernel/modprobe r,
unix (bind, listen) type=stream addr="@xtables",
/{,var/}run/xtables.lock rwk,
@{PROC}/@{pid}/net/ r,
@{PROC}/@{pid}/net/** r,
# nft accesses these for routing expressions and device groups
/etc/iproute2/ r,
/etc/iproute2/rt_marks r,
/etc/iproute2/rt_realms r,
/etc/iproute2/group r,
# sysctl
/{,usr/}{,s}bin/sysctl ixr,
@{PROC}/sys/ r,
@{PROC}/sys/net/ r,
@{PROC}/sys/net/core/ r,
@{PROC}/sys/net/core/** r,
@{PROC}/sys/net/ipv{4,6}/ r,
@{PROC}/sys/net/ipv{4,6}/** r,
@{PROC}/sys/net/netfilter/ r,
@{PROC}/sys/net/netfilter/** r,
@{PROC}/sys/net/nf_conntrack_max r,
# check the state of the Kmod modules
/sys/module/arp_tables/ r,
/sys/module/arp_tables/initstate r,
/sys/module/br_netfilter/ r,
/sys/module/br_netfilter/initstate r,
/sys/module/iptable_filter/ r,
/sys/module/iptable_filter/initstate r,
/sys/module/ip6table_filter/ r,
/sys/module/ip6table_filter/initstate r,
/sys/module/nf_*/initstate r,
# read netfilter module parameters
/sys/module/nf_*/ r,
/sys/module/nf_*/parameters/{,*} r,
# write netfilter module parameters
/sys/module/nf_conntrack/parameters/hashsize w,
# various firewall related sysctl files
@{PROC}/sys/net/bridge/bridge-nf-call-arptables rw,
@{PROC}/sys/net/bridge/bridge-nf-call-iptables rw,
@{PROC}/sys/net/bridge/bridge-nf-call-ip6tables rw,
@{PROC}/sys/net/bridge/bridge-nf-filter-pppoe-tagged rw,
@{PROC}/sys/net/bridge/bridge-nf-filter-vlan-tagged rw,
@{PROC}/sys/net/bridge/bridge-nf-pass-vlan-input-dev rw,
@{PROC}/sys/net/ipv4/conf/*/rp_filter w,
@{PROC}/sys/net/ipv{4,6}/conf/*/accept_source_route w,
@{PROC}/sys/net/ipv{4,6}/conf/*/accept_redirects w,
@{PROC}/sys/net/ipv4/icmp_echo_ignore_broadcasts w,
@{PROC}/sys/net/ipv4/icmp_ignore_bogus_error_responses w,
@{PROC}/sys/net/ipv4/icmp_echo_ignore_all w,
@{PROC}/sys/net/ipv4/ip_forward w,
@{PROC}/sys/net/ipv4/conf/*/log_martians w,
@{PROC}/sys/net/ipv4/tcp_syncookies w,
@{PROC}/sys/net/ipv6/conf/*/forwarding w,
@{PROC}/sys/net/netfilter/nf_conntrack_helper rw,
@{PROC}/sys/net/netfilter/nf_conntrack_max rw,
@{PROC}/sys/net/netfilter/nf_conntrack_tcp_timeout_close_wait rw,
@{PROC}/sys/net/netfilter/nf_conntrack_tcp_timeout_established rw,
`
// http://bazaar.launchpad.net/~ubuntu-security/ubuntu-core-security/trunk/view/head:/data/seccomp/policygroups/ubuntu-core/16.04/firewall-control
const firewallControlConnectedPlugSecComp = `
# Description: Can configure firewall. This is restricted because it gives
# privileged access to networking and should only be used with trusted apps.
# for connecting to xtables abstract and netlink sockets
bind
socket AF_NETLINK - NETLINK_FIREWALL
socket AF_NETLINK - NETLINK_NFLOG
socket AF_NETLINK - NETLINK_NETFILTER
socket AF_NETLINK - NETLINK_IP6_FW
socket AF_NETLINK - NETLINK_ROUTE
# for ping and ping6
capset
setuid
`
// These don't auto-load via iptables, etc
var firewallControlConnectedPlugKmod = []string{
"arp_tables",
"br_netfilter",
"ip6table_filter",
"iptable_filter",
}
func init() {
registerIface(&commonInterface{
name: "firewall-control",
summary: firewallControlSummary,
implicitOnCore: true,
implicitOnClassic: true,
baseDeclarationSlots: firewallControlBaseDeclarationSlots,
connectedPlugAppArmor: firewallControlConnectedPlugAppArmor,
connectedPlugSecComp: firewallControlConnectedPlugSecComp,
connectedPlugKModModules: firewallControlConnectedPlugKmod,
})
}
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