#! /bin/sh
# user interface to automatic keying and Pluto in general
# Copyright (C) 1998, 1999, 2000  Henry Spencer.
# 
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2 of the License, or (at your
# option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
# 
# 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.
#
# RCSID $Id: auto.in,v 1.17 2006/04/20 04:42:12 as Exp $

me='ipsec auto'
usage="Usage:
	$me [--showonly] [--asynchronous] --up connectionname
	$me [--showonly] [-- type conn|ca] --{add|delete|replace|down} name
	$me [--showonly] --{route|unroute} connectionname
	$me [--showonly] --ready
	$me [--showonly] --{status|statusall} [connectionname]
	$me [--showonly] --{rereadsecrets|rereadgroups}
	$me [--showonly] --{rereadcacerts|rereadaacerts|rereadocspcerts}
	$me [--showonly] --{rereadacerts|rereadcrls|rereadall}
	$me [--showonly] [--utc] --{listalgs|listpubkeys|listcerts}
	$me [--showonly] [--utc] --{listcacerts|listaacerts|listocspcerts}
	$me [--showonly] [--utc] --{listacerts|listgroups|listcainfos}
	$me [--showonly] [--utc] --{listcrls|listocsp|listcards|listall}
	$me [--showonly] --purgeocsp

	other options: [--config ipsecconfigfile] [--verbose] [--show]"

showonly=
config=
info=/var/run/ipsec.info
shopts=
noinclude=
async=
logfilter='$1 != "002"'
op=
argc=
utc=
type="conn"
name="--name"

for dummy
do
	case "$1" in
	--help)		echo "$usage" ; exit 0	;;
	--version)	echo "$me $IPSEC_VERSION" ; exit 0	;;
	--show)		shopts=-x		;;
	--showonly)	showonly=yes		;;
	--utc)		utc="$1"		;;
	--config)	config="--config $2" ; shift	;;
	--noinclude)	noinclude=--noinclude	;;
	--asynchronous)	async="--asynchronous"	;;
	--verbose)	logfilter='1'		;;
	--type)		type="$2" ; shift	;;
	--up|--down|--add|--delete|--replace|--route|--unroute)
			if test " $op" != " "
			then
				echo "$usage" >&2
				exit 2
			fi
			op="$1"
			argc=1
			if test "$type" = "ca"
			then
				name="--caname"
				case "$op" in
				--add|--delete|--replace) ;;
				--*) echo "$op option not supported for --type ca";
				     exit 3 ;;
				esac
			fi
			;;
	--status|--statusall)
			if test " $op" != " "
			then
				echo "$usage" >&2
				exit 2
			fi
			op="$1"
			argc=1
			if test $# -eq 1
			then
				argc=0; name=
			fi
			;;
	--ready|--rereadsecrets|--rereadgroups|\
	--rereadcacerts|--rereadaacerts|--rereadocspcerts|\
	--rereadacerts|--rereadcrls|--rereadall|\
	--listalgs|--listpubkeys|--listcerts|\
	--listcacerts|--listaacerts|--listocspcerts|\
	--listacerts|--listgroups|--listcainfos|\
	--listcrls|--listocsp|--listcards|--listall|\
	--purgeocsp)
			if test " $op" != " "
			then
				echo "$usage" >&2
				exit 2
			fi
			op="$1"
			argc=0
			;;
	--)		shift ; break		;;
	-*)		echo "$me: unknown option \`$1'" >&2 ; exit 2 ;;
	*)		break			;;
	esac
	shift
done

names=
case "$op" in
--*)		if test " $argc" -ne $#
		then
			echo "$usage" >&2
			exit 2
		fi
		names="$*"
		;;
*)		echo "$usage" >&2 ; exit 2	;;
esac


runit() {
	if test "$showonly"
	then
		cat
	else
		(
			echo '('
			cat
			echo ')'
			echo 'echo = $?'
		) | sh $shopts |
			awk "/^= / { exit \$2 } $logfilter { print }"
	fi
}

case "$op" in
--ready)	   echo "ipsec whack --listen"		       | runit ; exit ;;
--rereadsecrets)   echo "ipsec whack --rereadsecrets"	       | runit ; exit ;;
--rereadgroups)	   echo "ipsec whack --listen"		       | runit ; exit ;;
--rereadcacerts)   echo "ipsec whack --rereadcacerts"          | runit ; exit ;;
--rereadaacerts)   echo "ipsec whack --rereadaacerts"          | runit ; exit ;;
--rereadocspcerts) echo "ipsec whack --rereadocspcerts"        | runit ; exit ;;
--rereadacerts)    echo "ipsec whack --rereadacerts"           | runit ; exit ;;
--rereadcrls)	   echo "ipsec whack --rereadcrls"	       | runit ; exit ;;
--rereadall)	   echo "ipsec whack --rereadall"	       | runit ; exit ;;
--listalgs)	   echo "ipsec whack --listalgs"               | runit ; exit ;;
--listpubkeys)	   echo "ipsec whack $utc --listpubkeys"       | runit ; exit ;;
--listcerts)	   echo "ipsec whack $utc --listcerts"         | runit ; exit ;;
--listcacerts)	   echo "ipsec whack $utc --listcacerts"       | runit ; exit ;;
--listaacerts)	   echo "ipsec whack $utc --listaacerts"       | runit ; exit ;;
--listocspcerts)   echo "ipsec whack $utc --listocspcerts"     | runit ; exit ;;
--listacerts)	   echo "ipsec whack $utc --listacerts"        | runit ; exit ;;
--listgroups)	   echo "ipsec whack $utc --listgroups"        | runit ; exit ;;
--listcainfos)	   echo "ipsec whack $utc --listcainfos"       | runit ; exit ;;
--listcrls)	   echo "ipsec whack $utc --listcrls"          | runit ; exit ;;
--listocsp)	   echo "ipsec whack $utc --listocsp"          | runit ; exit ;;
--listcards)	   echo "ipsec whack $utc --listcards"         | runit ; exit ;;
--listall)	   echo "ipsec whack $utc --listall"           | runit ; exit ;;
--purgeocsp)	   echo "ipsec whack $utc --purgeocsp"         | runit ; exit ;;
--up)	echo "ipsec whack $async --name $names --initiate"     | runit ; exit ;;
--down)	echo "ipsec whack --name $names --terminate"	       | runit ; exit ;;
--delete)	   echo "ipsec whack $name $names --delete"    | runit ; exit ;;
--route)	   echo "ipsec whack --name $names --route"    | runit ; exit ;;
--unroute)	   echo "ipsec whack --name $names --unroute"  | runit ; exit ;;
--status)	   echo "ipsec whack $name $names --status"    | runit ; exit ;;
--statusall)	   echo "ipsec whack $name $names --statusall" | runit ; exit ;;
esac

if test -s $info
then
	. $info
fi

ipsec _confread $config $noinclude --type $type $names |
awk -v section="$type" '	BEGIN {
		FS = "\t"
		op = "'"$op"'"
		err = "cat >&2"
		draddr = "'"$defaultrouteaddr"'"
		drnexthop = "'"$defaultroutenexthop"'"
		failed = 0
		s[""] = ""
		init()
		print "PATH=\"'"$PATH"'\""
		print "export PATH"
		flip["left"] = "right"
		flip["right"] = "left"
	}
	function init(n) {
		for (n in s)
			delete s[n]
		name = ""
		seensome = 0
	}
	$1 == ":" {
		s[$2] = $3
		seensome = 1
		next
	}
	$1 == "!" {
		if ($2 != "")
			fail($2)
		next
	}
	$1 == "=" {
		if (name == "")
			name = $2
		next
	}
	$1 == "." {
		if (section == "ca")
			output_ca()
		else
			output()
		init()
		next
	}
	{
		fail("internal error, unknown type code " v($1))
	}
	function fail(m) {
		print "ipsec_auto: fatal error in " v(name) ": " m |err
		failed = 1
		exit
	}
	function yesno(k) {
		if ((k in s) && s[k] != "yes" && s[k] != "no")
			fail("parameter " v(k) " must be \"yes\" or \"no\"")
	}
	function setdefault(k, val) {
		if (!(k in s))
			s[k] = val
	}
	function was(new, old) {
		if (!(new in s) && (old in s))
			s[new] = s[old]
	}
	function need(k) {
		if (!(k in s))
			fail("connection has no " v(k) " parameter specified")
		if (s[k] == "")
			fail("parameter " v(k) " value must be non-empty")
	}
	function integer(k) {
		if (!(k in s))
			return
		if (s[k] !~ /^[0-9]+$/)
			fail("parameter " v(k) " value must be integer")
	}
	function duration(k,   n, t) {
		if (!(k in s))
			return
		t = s[k]
		n = substr(t, 1, length(t)-1)
		if (t ~ /^[0-9]+$/)
			s[k] = t
		else if (t ~ /^[0-9]+s$/)
			s[k] = n
		else if (t ~ /^[0-9]+(\.[0-9]+)?m$/)
			s[k] = int(n*60)
		else if (t ~ /^[0-9]+(\.[0-9]+)?h$/)
			s[k] = int(n*3600)
		else if (t ~ /^[0-9]+(\.[0-9]+)?d$/)
			s[k] = int(n*3600*24)
		else
			fail("parameter " v(k) " not valid time, must be nnn[smhd]")
	}
	function nexthopset(dir, val,   k) {
		k = dir "nexthop"
		if (k in s)
			fail("non-default value of " k " is being overridden")
		if (val != "")
			s[k] = val
		else if (k in s)
			delete s[k]
	}
	function id(dir,   k) {
		k = dir "id"
		if (!(k in s))
			k = dir
		return s[k]
	}
	function whackkey(dir, which, flag,   rk, n) {
		if (id(dir) == "%opportunistic")
			return
		rk = s[dir which]
		if (rk == "%dnsondemand")
		{
			kod="--dnskeyondemand"
			return
		}
		if (rk == "" || rk == "%none" || rk == "%cert" || rk == "0x00")
			return
		n = "\"\\\"" name "\\\" " dir which"\""
		if (rk == "%dns" || rk == "%dnsonload")
		{
			if (id(flip[dir]) == "%opportunistic" || s[flip[dir]] == "%any")
				return
			print "ipsec whack --label", n, flag,
						"--keyid", q(id(dir)), "\\"
		}
		else
		{
			print "ipsec whack --label", n, flag,
						"--keyid", q(id(dir)),
						"--pubkeyrsa", q(rk), "\\"
		}
		print "\t|| exit $?"
	}
	function q(str) {	# quoting for shell
		return "\"" str "\""
	}
	function qs(k) {	# utility abbreviation for q(s[k])
		return q(s[k])
	}
	function v(str) {	# quoting for human viewing
		return "\"" str "\""
	}
	function output() {
		if (!seensome)
			fail("internal error, output called inappropriately")

		setdefault("type", "tunnel")
		type_flags = ""
		t = s["type"]
		if (t == "tunnel") {
			# do NOT default subnets to side/32, despite what
			# the docs say...
			type_flags = "--tunnel"
		} else if (t == "transport") {
			if ("leftsubnet" in s)
				fail("type=transport incompatible with leftsubnet")
			if ("rightsubnet" in s)
				fail("type=transport incompatible with rightsubnet")
			type_flags = ""
		} else if (t == "passthrough") {
			type_flags = "--pass"
		} else if (t == "drop") {
			type_flags = "--drop"
		} else if (t == "reject") {
			type_flags = "--reject"
		} else
			fail("unknown type " v(t))

		setdefault("failureshunt", "none")
		t = s["failureshunt"]
		if (t == "passthrough")
			type_flags = type_flags " --failpass";
		else if (t == "drop")
			type_flags = type_flags " --faildrop";
		else if (t == "reject")
			type_flags = type_flags " --failreject";
		else if (t != "none")
			fail("unknown failureshunt value " v(t))

		need("left")
		need("right")
		if (s["left"] == "%defaultroute") {
			if (s["right"] == "%defaultroute")
				fail("left and right cannot both be %defaultroute")
			if (draddr == "")
				fail("%defaultroute requested but not known")
			s["left"] = draddr
			nexthopset("left", drnexthop)
		} else if (s["right"] == "%defaultroute") {
			if (draddr == "")
				fail("%defaultroute requested but not known")
			s["right"] = draddr
			nexthopset("right", drnexthop)
		}

		setdefault("keyexchange", "ike")
		if (s["keyexchange"] != "ike")
			fail("only know how to do keyexchange=ike")
		setdefault("auth", "esp")
		if (("auth" in s) && s["auth"] != "esp" && s["auth"] != "ah")
			fail("only know how to do auth=esp or auth=ah")
		yesno("pfs")

		setdefault("pfs", "yes")
		duration("dpddelay")
		duration("dpdtimeout")
		if ("dpdaction" in s)
		{
			setdefault("dpddelay",30)
			setdefault("dpdtimeout",120)
		}
		yesno("compress")
		setdefault("compress", "no")
		setdefault("keylife", "1h")
		duration("keylife")
		yesno("rekey")
		setdefault("rekey", "yes")
		setdefault("rekeymargin", "9m")
		duration("rekeymargin")
		setdefault("keyingtries", "%forever")
		if (s["keyingtries"] == "%forever")
			s["keyingtries"] = 0
		integer("keyingtries")
		if ("rekeyfuzz" in s) {
			if (s["rekeyfuzz"] !~ /%$/)
				fail("rekeyfuzz must be nnn%")
			r = s["rekeyfuzz"]
			s["rekeyfuzz"] = substr(r, 1, length(r)-1)
			integer("rekeyfuzz")
		}
		duration("ikelifetime")
		setdefault("disablearrivalcheck", "no")

		setdefault("leftsendcert", "always")
		setdefault("rightsendcert", "always")

		setdefault("leftnexthop", "%direct")
		setdefault("rightnexthop", "%direct")
		if (s["leftnexthop"] == s["left"])
			fail("left and leftnexthop must not be the same")
		if (s["rightnexthop"] == s["right"])
			fail("right and rightnexthop must not be the same")
		if (s["leftnexthop"] == "%defaultroute") {
			if (drnexthop == "")
				fail("%defaultroute requested but not known")
			s["leftnexthop"] = drnexthop
		}
		if (s["rightnexthop"] == "%defaultroute") {
			if (drnexthop == "")
				fail("%defaultroute requested but not known")
			s["rightnexthop"] = drnexthop
		}

		if ("leftfirewall" in s && "leftupdown" in s)
			fail("cannot have both leftfirewall and leftupdown")
		if ("rightfirewall" in s && "rightupdown" in s)
			fail("cannot have both rightfirewall and rightupdown")
		setdefault("leftupdown", "ipsec _updown")
		setdefault("rightupdown", "ipsec _updown")
		setdefault("lefthostaccess", "no")
		setdefault("righthostaccess", "no")
		yesno("lefthostaccess")
		yesno("righthostaccess")
		lha = ""
		if (s["lefthostaccess"] == "yes")
			lha = "--hostaccess"
		rha = ""
		if (s["righthostaccess"] == "yes")
			rha = "--hostaccess"
		setdefault("leftfirewall", "no")
		setdefault("rightfirewall", "no")
		yesno("leftfirewall")
		yesno("rightfirewall")
		if (s["leftfirewall"] == "yes")
			s["leftupdown"] = s["leftupdown"] " iptables"
		if (s["rightfirewall"] == "yes")
			s["rightupdown"] = s["rightupdown"] " iptables"

		setdefault("authby", "rsasig")
		t = s["authby"]
		if (t == "rsasig" || t == "secret|rsasig" || t == "rsasig|secret") {
			authtype = "--rsasig"
			type_flags = "--encrypt " type_flags
			if (!("leftcert" in s)) {
				setdefault("leftrsasigkey", "%cert")
				if (id("left") == "%any" &&
				    !(s["leftrsasigkey"] == "%cert" ||
				      s["leftrsasigkey"] == "0x00") )
					fail("ID " v(id("left")) " cannot have RSA key")
			}
			if (!("rightcert" in s)) {
				setdefault("rightrsasigkey", "%cert")
				if (id("right") == "%any" &&
				    !(s["rightrsasigkey"] == "%cert" ||
				      s["rightrsasigkey"] == "0x00") )
					fail("ID " v(id("right")) " cannot have RSA key")
			}
			if (t != "rsasig")
				authtype = authtype " --psk"
 		} else if (t == "secret") {
			authtype = "--psk"
			type_flags = "--encrypt " type_flags
		} else if (t == "never") {
			authtype = ""
		} else {
			fail("unknown authby value " v(t))
		}

		settings = type_flags
		setdefault("ike", "3des-sha,3des-md5")
		if (s["ike"] != "")
			settings = settings " --ike " qs("ike")
		setdefault("esp", "3des")
		if (s["esp"] != "")
			settings = settings " --esp " qs("esp")
		if (s["auth"] == "ah")
			settings = settings " --authenticate"
		if (s["pfs"] == "yes") {
			settings = settings " --pfs"
			if (s["pfsgroup"] != "")
				settings = settings " --pfsgroup " qs("pfsgroup")
		}
		
		if (s["dpdaction"])
			settings = settings " --dpdaction " qs("dpdaction")
		if (s["dpddelay"])
			settings = settings " --dpddelay " qs("dpddelay")
		if (s["dpdtimeout"])
			settings = settings " --dpdtimeout " qs("dpdtimeout")

		if (s["compress"] == "yes")
			settings = settings " --compress"
		if (op == "--replace")
			settings = settings " --delete"
		if ("ikelifetime" in s)
			settings = settings " --ikelifetime " qs("ikelifetime")
		if (s["disablearrivalcheck"] == "yes")
			settings = settings " --disablearrivalcheck"
		settings = settings " " authtype

		lc = ""
		rc = ""
		if ("leftsubnet" in s)
			lc = "--client " qs("leftsubnet")
		if ("rightsubnet" in s)
			rc = "--client " qs("rightsubnet")
		if ("leftsubnetwithin" in s)
			lc = lc " --clientwithin " qs("leftsubnetwithin")
		if ("rightsubnetwithin" in s)
			rc = rc " --clientwithin " qs("rightsubnetwithin")
		lp = ""
		rp = ""
		if ("leftprotoport" in s)
			lp = "--clientprotoport " qs("leftprotoport")
		if ("rightprotoport" in s)
			rp = "--clientprotoport " qs("rightprotoport")
		lud = "--updown " qs("leftupdown")
		rud = "--updown " qs("rightupdown")
		
		lid = ""
		if ("leftid" in s)
			lid = "--id " qs("leftid")
		rid = ""
		if ("rightid" in s)
			rid = "--id " qs("rightid")
		lsip = ""
		if ("leftsourceip" in s)
		        lsip = "--srcip " qs("leftsourceip")
		rsip = ""
		if ("rightsourceip" in s)
			rsip = "--srcip " qs("rightsourceip")
		lscert = ""
		if ("leftsendcert" in s)
			lscert = "--sendcert " qs("leftsendcert")
		rscert = ""
		if ("rightsendcert" in s)
			rscert = "--sendcert " qs("rightsendcert")
		lcert = ""
		if ("leftcert" in s)
			lcert = "--cert " qs("leftcert")
		rcert = ""
		if ("rightcert" in s)
			rcert = "--cert " qs("rightcert")
		lca = ""
		if ("leftca" in s)
			lca = "--ca " qs("leftca")
		rca = ""
		if ("rightca" in s)
			rca = "--ca " qs("rightca")
		lgr = ""
		if ("leftgroups" in s)
			lgr = "--groups " qs("leftgroups")
		rgr = ""
		if ("rightgroups" in s)
			rgr = "--groups " qs("rightgroups")
		fuzz = ""
		if ("rekeyfuzz" in s)
			fuzz = "--rekeyfuzz " qs("rekeyfuzz")
		rk = ""
		if (s["rekey"] == "no")
			rk = "--dontrekey"
		pd = ""
		if ("_plutodevel" in s)
			pd = "--plutodevel " s["_plutodevel"]	# not qs()

		lkod = ""
		rkod = ""
		if (authtype != "--psk") {
			kod = ""
			whackkey("left", "rsasigkey", "")
			whackkey("left", "rsasigkey2", "--addkey")
			lkod = kod
			kod = ""
			whackkey("right", "rsasigkey", "")
			whackkey("right", "rsasigkey2", "--addkey")
			rkod = kod
		}
		print "ipsec whack --name", name, settings, "\\"
		print "\t--host", qs("left"), lc, lp, "--nexthop",
			qs("leftnexthop"), lud, lha, lid, lkod, lscert, lcert, lca, lsip, lgr, "\\"
		print "\t--to", "--host", qs("right"), rc, rp, "--nexthop",
			qs("rightnexthop"), rud, rha, rid, rkod, rscert, rcert, rca, rsip, rgr, "\\"
		print "\t--ipseclifetime", qs("keylife"),
			"--rekeymargin", qs("rekeymargin"), "\\"
		print "\t--keyingtries", qs("keyingtries"), fuzz, rk, pd, "\\"
		print "\t|| exit $?"
	}
	function output_ca() {
		if (!seensome)
			fail("internal error, output called inappropriately")
		settings = ""
		if (op == "--replace")
			settings = "--delete"
		cacert = ""
		if ("cacert" in s)
			cacert = "--cacert " qs("cacert")
		ldaphost = ""
		if ("ldaphost" in s)
			ldaphost = "--ldaphost " qs("ldaphost")
		ldapbase = ""
		if ("ldapbase" in s)
			ldapbase = "--ldapbase " qs("ldapbase")
		crluri = ""
		if ("crluri" in s)
			crluri = "--crluri " qs("crluri")
		crluri2 = ""
		if ("crluri2" in s)
			crluri2 = "--crluri2 " qs("crluri2")
		ocspuri = ""
		if ("ocspuri" in s)
			ocspuri = "--ocspuri " qs("ocspuri")
		yesno("strictcrlpolicy")
		setdefault("strictcrlpolicy", "no")
		if (s["strictcrlpolicy"] == "yes")
			settings = settings " --strictcrlpolicy"
		yesno("cachecrls")
		setdefault("cachecrls", "no")
		if (s["cachecrls"] == "yes")
			settings = settings " --cachecrls"

		print "ipsec whack --caname", name, settings, cacert, ldaphost, ldapbase,
			crluri, crluri2, ocspuri, "\\"
		print "\t|| exit $?"
	}
	END {
		if (failed) {
			print "# fatal error discovered, force failure using \"false\" command"
			print "false"
			exit 1		# just on general principles
		}
		if (seensome) {
			if (section == "ca")
				output_ca()
			else
				output()
		}
	}' | runit