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--[[
Base data model for Alpine Wall
Copyright (C) 2012 Kaarle Ritvanen
Licensed under the terms of GPL2
]]--
module(..., package.seeall)
require 'awall'
require 'awall.host'
require 'awall.iptables'
require 'awall.object'
require 'awall.optfrag'
require 'awall.util'
local util = awall.util
local combinations = awall.optfrag.combinations
class = awall.object.class
ConfigObject = class(awall.object.Object)
function ConfigObject:init(context, location)
if context then
self.context = context
self.root = context.objects
end
self.location = location
end
function ConfigObject:create(cls, params)
if type(cls) == 'string' then
local name = cls
cls = awall.classmap[cls]
if not cls then
self:error('Support for '..name..' objects not installed')
end
end
return cls.morph(params, self.context, self.location)
end
function ConfigObject:error(msg) error(self.location..': '..msg) end
function ConfigObject:warning(msg)
io.stderr:write(self.location..': '..msg..'\n')
end
function ConfigObject:trules() return {} end
function ConfigObject:info()
local res = {}
for i, trule in ipairs(self:trules()) do
table.insert(res,
{' '..awall.optfrag.location(trule),
(trule.opts and trule.opts..' ' or '')..'-j '..trule.target})
end
return res
end
Zone = class(ConfigObject)
function Zone:optfrags(dir)
local iopt, aopt, iprop, aprop
if dir == 'in' then
iopt, aopt, iprop, aprop = 'i', 's', 'in', 'src'
elseif dir == 'out' then
iopt, aopt, iprop, aprop = 'o', 'd', 'out', 'dest'
else assert(false) end
local aopts = nil
if self.addr then
aopts = {}
for i, hostdef in util.listpairs(self.addr) do
for i, addr in ipairs(awall.host.resolve(hostdef, self)) do
table.insert(aopts,
{family=addr[1],
[aprop]=addr[2],
opts='-'..aopt..' '..addr[2]})
end
end
end
return combinations(util.maplist(self.iface,
function(x)
return {[iprop]=x,
opts='-'..iopt..' '..x}
end),
aopts)
end
fwzone = Zone.new()
Rule = class(ConfigObject)
function Rule:init(...)
ConfigObject.init(self, unpack(arg))
self.newchains = {}
for i, prop in ipairs({'in', 'out'}) do
self[prop] = self[prop] and util.maplist(self[prop],
function(z)
if type(z) ~= 'string' then return z end
return z == '_fw' and fwzone or
self.root.zone[z] or
self:error('Invalid zone: '..z)
end)
end
if self.service then
if type(self.service) == 'string' then self.label = self.service end
self.service = util.maplist(self.service,
function(s)
if type(s) ~= 'string' then return s end
return self.root.service[s] or self:error('Invalid service: '..s)
end)
end
end
function Rule:zoneoptfrags()
local function zonepair(zin, zout)
local function zofs(zone, dir)
if not zone then return zone end
return zone:optfrags(dir)
end
local chain, ofrags
if zin == fwzone or zout == fwzone then
if zin == zout then return {} end
local dir, z = 'in', zin
if zin == fwzone then dir, z = 'out', zout end
chain = string.upper(dir)..'PUT'
ofrags = zofs(z, dir)
elseif not zin or not zout then
if zin then
chain = 'PREROUTING'
ofrags = zofs(zin, 'in')
elseif zout then
chain = 'POSTROUTING'
ofrags = zofs(zout, 'out')
end
else
chain = 'FORWARD'
ofrags = combinations(zofs(zin, 'in'), zofs(zout, 'out'))
if ofrags then
ofrags = util.filter(ofrags,
function(of)
return not (of['in'] and of.out and
of['in'] == of.out)
end)
end
end
return combinations(ofrags,
chain and {{chain=chain}} or {{chain='PREROUTING'},
{chain='OUTPUT'}})
end
local res = {}
local izones = self['in'] or {}
local ozones = self.out or {}
for i = 1,math.max(1, table.maxn(izones)) do
for j = 1,math.max(1, table.maxn(ozones)) do
util.extend(res, zonepair(izones[i], ozones[j]))
end
end
return res
end
function Rule:servoptfrags()
if not self.service then return end
local function containskey(tbl, key)
for k, v in pairs(tbl) do if k == key then return true end end
return false
end
local ports = {}
local res = {}
for i, serv in ipairs(self.service) do
for i, sdef in util.listpairs(serv) do
if not sdef.proto then self:error('Protocol not defined') end
if util.contains({6, 'tcp', 17, 'udp'}, sdef.proto) then
local new = not containskey(ports, sdef.proto)
if new then ports[sdef.proto] = {} end
if new or ports[sdef.proto][1] then
if sdef.port then
util.extend(ports[sdef.proto], sdef.port)
else ports[sdef.proto] = {} end
end
else
local opts = '-p '..sdef.proto
local family = nil
-- TODO multiple ICMP types per rule
local oname
if util.contains({1, 'icmp'}, sdef.proto) then
family = 'inet'
oname = 'icmp-type'
elseif util.contains({58, 'ipv6-icmp', 'icmpv6'}, sdef.proto) then
family = 'inet6'
oname = 'icmpv6-type'
elseif sdef.type then
self:error('Type specification not valid with '..sdef.proto)
end
if sdef.type then opts = opts..' --'..oname..' '..sdef.type end
table.insert(res, {family=family, opts=opts})
end
end
end
for proto, plist in pairs(ports) do
local opts = '-p '..proto
local len = table.maxn(plist)
if len == 1 then
opts = opts..' --dport '..plist[1]
elseif len > 1 then
opts = opts..' -m multiport --dports '..table.concat(plist, ',')
end
table.insert(res, {opts=opts})
end
return res
end
function Rule:destoptfrags()
return self:create(Zone, {addr=self.dest}):optfrags('out')
end
function Rule:table() return 'filter' end
function Rule:position() return 'append' end
function Rule:target()
if not self.action then self:error('Action not defined') end
if util.contains({'accept', 'drop', 'reject'}, self.action) then
return string.upper(self.action)
end
return self.action
end
function Rule:trules()
local function tag(ofrags, tag, value)
for i, ofrag in ipairs(ofrags) do
assert(not ofrag[tag])
ofrag[tag] = value
end
end
local families
local function setfamilies(ofrags)
if ofrags then
families = {}
for i, ofrag in ipairs(ofrags) do
if not ofrag.family then
families = nil
return
end
table.insert(families, ofrag.family)
end
else families = nil end
end
local function ffilter(ofrags)
if not ofrags or not ofrags[1] or not families then return ofrags end
return util.filter(ofrags,
function(of)
return not of.family or util.contains(families,
of.family)
end)
end
local res = self:zoneoptfrags()
if self.ipset then
local ipsetofrags = {}
for i, ipset in util.listpairs(self.ipset) do
if not ipset.name then self:error('Set name not defined') end
local setdef = self.root.ipset and self.root.ipset[ipset.name]
if not setdef then self:error('Invalid set name') end
if not ipset.args then
self:error('Set direction arguments not defined')
end
local setopts = '-m set --match-set '..ipset.name..' '
setopts = setopts..table.concat(util.map(util.list(ipset.args),
function(a)
if a == 'in' then return 'src' end
if a == 'out' then return 'dst' end
self:error('Invalid set direction argument')
end),
',')
table.insert(ipsetofrags, {family=setdef.family, opts=setopts})
end
res = combinations(res, ipsetofrags)
end
if self.ipsec then
res = combinations(res, {{opts='-m policy --pol ipsec --dir '..self.ipsec}})
end
res = combinations(res, self:servoptfrags())
setfamilies(res)
local addrofrags = combinations(self:create(Zone, {addr=self.src}):optfrags('in'),
self:destoptfrags())
if addrofrags then
addrofrags = ffilter(addrofrags)
setfamilies(addrofrags)
res = ffilter(res)
end
local addrchain = false
for i, ofrag in ipairs(res) do
if not ofrag.chain then ofrag.chain = ofrag.fchain end
addrchain = addrchain or (self.src and ofrag.src) or (self.dest and ofrag.dest)
end
local target
if addrchain then
target = self:newchain('address')
else
target = self:target()
res = combinations(res, addrofrags)
end
tag(res, 'position', self:position())
res = combinations(res, {{target=target}})
if addrchain then
for i, ofrag in ipairs(addrofrags) do
ofrag.chain = target
ofrag.target = self:target()
table.insert(res, ofrag)
end
end
util.extend(res, ffilter(self:extraoptfrags()))
local tbl = self:table()
local function convertchains(ofrags)
local res = {}
for i, ofrag in ipairs(ofrags) do
if util.contains(awall.iptables.builtin[tbl], ofrag.chain) then
table.insert(res, ofrag)
else
local chains
if ofrag.chain == 'PREROUTING' then chains = {'FORWARD', 'INPUT'}
elseif ofrag.chain == 'POSTROUTING' then
chains = {'FORWARD', 'OUTPUT'}
elseif util.contains({'INPUT', 'FORWARD'}, ofrag.chain) then
chains = {'PREROUTING'}
end
if chains then
ofrag.chain = nil
util.extend(res,
convertchains(combinations({ofrag},
util.map(chains,
function(c)
return {chain=c}
end))))
else table.insert(res, ofrag) end
end
end
return res
end
res = convertchains(res)
tag(res, 'table', tbl, false)
local function checkzof(ofrag, dir, chains)
if ofrag[dir] and util.contains(chains, ofrag.chain) then
self:error('Cannot specify '..dir..'bound interface ('..ofrag[dir]..')')
end
end
for i, ofrag in ipairs(res) do
checkzof(ofrag, 'in', {'OUTPUT', 'POSTROUTING'})
checkzof(ofrag, 'out', {'INPUT', 'PREROUTING'})
end
return combinations(res, ffilter({{family='inet'}, {family='inet6'}}))
end
function Rule:extraoptfrags() return {} end
function Rule:newchain(key)
if self.newchains[key] then return self.newchains[key] end
if not self.context.lastid then self.context.lastid = {} end
local lastid = self.context.lastid
local res = key
if self.label then res = res..'-'..self.label end
if not lastid[res] then lastid[res] = -1 end
lastid[res] = lastid[res] + 1
res = res..'-'..lastid[res]
self.newchains[key] = res
return res
end
classes = {{'zone', Zone}}
|