// -*- Mode: Go; indent-tabs-mode: t -*-

/*
 * Copyright (C) 2016 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

import (
	"github.com/ubuntu-core/snappy/interfaces"
)

// http://bazaar.launchpad.net/~ubuntu-security/ubuntu-core-security/trunk/view/head:/data/apparmor/policygroups/ubuntu-core/16.04/network-control
const networkControlConnectedPlugAppArmor = `
# Description: Can configure networking. This is restricted because it gives
# wide, privileged access to networking and should only be used with trusted
# apps.
# Usage: reserved

#include <abstractions/nameservice>
#include <abstractions/ssl_certs>

capability net_admin,
capability net_raw,
capability setuid, # ping

# Allow protocols except those that we blacklist in
# /etc/modprobe.d/blacklist-rare-network.conf
network appletalk,
network bridge,
network inet,
network inet6,
network ipx,
network packet,
network pppox,
network sna,

@{PROC}/@{pid}/net/ r,
@{PROC}/@{pid}/net/** r,

# used by sysctl, et al
@{PROC}/sys/ r,
@{PROC}/sys/net/ r,
@{PROC}/sys/net/core/ r,
@{PROC}/sys/net/core/** rw,
@{PROC}/sys/net/ipv{4,6}/ r,
@{PROC}/sys/net/ipv{4,6}/** rw,
@{PROC}/sys/net/netfilter/ r,
@{PROC}/sys/net/netfilter/** rw,
@{PROC}/sys/net/nf_conntrack_max rw,

# networking tools
/{,usr/}{,s}bin/arp ixr,
/{,usr/}{,s}bin/arpd ixr,
/{,usr/}{,s}bin/bridge ixr,
/{,usr/}{,s}bin/dhclient Pxr,             # use ixr instead if want to limit to snap dirs
/{,usr/}{,s}bin/ifconfig ixr,
audit deny /{,usr/}{,s}bin/if{up,down} r, # the system uses these, snaps shouldn't
/{,usr/}{,s}bin/ip ixr,
/{,usr/}{,s}bin/ipmaddr ixr,
/{,usr/}{,s}bin/iptunnel ixr,
audit deny /{,usr/}{,s}bin/mii-tool r,    # needs capability sys_module
/{,usr/}{,s}bin/nameif ixr,
/{,usr/}{,s}bin/netstat ixr,              # -p not supported
/{,usr/}{,s}bin/nstat ixr,
/{,usr/}{,s}bin/ping ixr,
/{,usr/}{,s}bin/ping6 ixr,
/{,usr/}{,s}bin/pppd ixr,
/{,usr/}{,s}bin/pppdump ixr,
/{,usr/}{,s}bin/pppoe-discovery ixr,
#/{,usr/}{,s}bin/pppstats ixr,            # needs sys_module
/{,usr/}{,s}bin/route ixr,
/{,usr/}{,s}bin/routef ixr,
/{,usr/}{,s}bin/routel ixr,
/{,usr/}{,s}bin/rtacct ixr,
/{,usr/}{,s}bin/rtmon ixr,
/{,usr/}{,s}bin/sysctl ixr,
/{,usr/}{,s}bin/tc ixr,
/{,usr/}{,s}bin/wpa_action ixr,
/{,usr/}{,s}bin/wpa_cli ixr,
/{,usr/}{,s}bin/wpa_passphrase ixr,
/{,usr/}{,s}bin/wpa_supplicant ixr,

# arp
network netlink dgram,

# ip, et al
/etc/iproute2/ r,
/etc/iproute2/* r,

# ping - child profile would be nice but seccomp causes problems with that
/{,usr/}{,s}bin/ping ixr,
/{,usr/}{,s}bin/ping6 ixr,
network inet raw,
network inet6 raw,

# pppd
capability setuid,
@{PROC}/@{pid}/loginuid r,
@{PROC}/@{pid}/mounts r,

# route
/etc/networks r,
`

// http://bazaar.launchpad.net/~ubuntu-security/ubuntu-core-security/trunk/view/head:/data/seccomp/policygroups/ubuntu-core/16.04/network-control
const networkControlConnectedPlugSecComp = `
# Description: Can configure networking. This is restricted because it gives
# wide, privileged access to networking and should only be used with trusted
# apps.
# Usage: reserved

# for ping and ping6
capset
`

// NewNetworkControlInterface returns a new "network-control" interface.
func NewNetworkControlInterface() interfaces.Interface {
	return &commonInterface{
		name: "network-control",
		connectedPlugAppArmor: networkControlConnectedPlugAppArmor,
		connectedPlugSecComp:  networkControlConnectedPlugSecComp,
		reservedForOS:         true,
	}
}
