added ikev1/net2net-same-nets scenario
This commit is contained in:
Andreas Steffen
parent
3f9ba3be66
commit
939c4bf2e8
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A connection between two identical <b>10.0.0.0/14</b> networks behind the gateways <b>moon</b>
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and <b>sun</b> is set up. In order to make network routing work, the subnet behind <b>moon</b>
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sees the subnet behind <b>sun</b> as <b>10.4.0.0/14</b> whereas the subnet behind <b>sun</b>
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sees the subnet behind <b>moon</b> as <b>10.8.0.0/14</b>. The necessary network mappings are
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done on gateway <b>sun</b> using the iptables <b>MARK</b> and <b>NETMAP</b> targets.
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<p/>
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Upon the successful establishment of the IPsec tunnel, on gateway <b>moon</b> the directive
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<b>leftfirewall=yes</b> automatically inserts iptables-based firewall rules that let pass
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the tunneled traffic whereas on gateway <b>sun</b> the script indicated by
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<b>leftupdown=/etc/mark_updown</b> inserts iptables rules that set marks defined in the
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connection definition of <b>ipsec.conf</b> both on the inbound and outbound traffic, create
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the necessary NETMAP operations and forward the tunneled traffic.
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<p/>
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In order to test both tunnel and firewall, client <b>alice</b> behind gateway <b>moon</b>
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pings client <b>bob</b> located behind gateway <b>sun</b> and vice versa.
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moon::ipsec statusall::net-net.*IPsec SA established::YES
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sun::ipsec statusall::net-net.*IPsec SA established::YES
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alice::ping -c 1 10.6.0.10::64 bytes from 10.6.0.10: icmp_seq=1::YES
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bob::ping -c 1 10.9.0.10::64 bytes from 10.9.0.10: icmp_seq=1::YES
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sun::tcpdump::IP moon.strongswan.org > sun.strongswan.org: ESP::YES
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sun::tcpdump::IP sun.strongswan.org > moon.strongswan.org: ESP::YES
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bob::tcpdump::IP 10.9.0.10 > bob.strongswan.org: ICMP echo request::YES
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bob::tcpdump::IP bob.strongswan.org > 10.9.0.10: ICMP echo reply::YES
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bob::tcpdump::IP bob.strongswan.org > 10.9.0.10: ICMP echo request::YES
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bob::tcpdump::IP 10.9.0.10 > bob.strongswan.org: ICMP echo reply::YES
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# /etc/ipsec.conf - strongSwan IPsec configuration file
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config setup
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crlcheckinterval=180
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strictcrlpolicy=no
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charonstart=no
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plutodebug=control
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conn %default
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ikelifetime=60m
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keylife=20m
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rekeymargin=3m
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keyingtries=1
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keyexchange=ikev1
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conn net-net
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left=PH_IP_MOON
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leftcert=moonCert.pem
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leftid=@moon.strongswan.org
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leftsubnet=10.0.0.0/14
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leftfirewall=yes
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right=PH_IP_SUN
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rightid=@sun.strongswan.org
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rightsubnet=10.4.0.0/14
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auto=add
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# /etc/ipsec.conf - strongSwan IPsec configuration file
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config setup
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crlcheckinterval=180
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strictcrlpolicy=no
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charonstart=no
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plutodebug=control
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conn %default
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ikelifetime=60m
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keylife=20m
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rekeymargin=3m
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keyingtries=1
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keyexchange=ikev1
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conn net-net
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left=PH_IP_SUN
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leftcert=sunCert.pem
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leftid=@sun.strongswan.org
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leftsubnet=10.4.0.0/14
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leftupdown=/etc/mark_updown
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right=PH_IP_MOON
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rightid=@moon.strongswan.org
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rightsubnet=10.0.0.0/14
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mark_in=8
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mark_out=4
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auto=add
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@ -0,0 +1,376 @@
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#! /bin/sh
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# updown script setting inbound marks on ESP traffic in the mangle chain
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#
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# Copyright (C) 2003-2004 Nigel Meteringham
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# Copyright (C) 2003-2004 Tuomo Soini
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# Copyright (C) 2002-2004 Michael Richardson
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# Copyright (C) 2005-2010 Andreas Steffen <andreas.steffen@strongswan.org>
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#
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# This program is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by the
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# Free Software Foundation; either version 2 of the License, or (at your
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# option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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# for more details.
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# CAUTION: Installing a new version of strongSwan will install a new
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# copy of this script, wiping out any custom changes you make. If
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# you need changes, make a copy of this under another name, and customize
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# that, and use the (left/right)updown parameters in ipsec.conf to make
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# strongSwan use yours instead of this default one.
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# things that this script gets (from ipsec_pluto(8) man page)
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#
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# PLUTO_VERSION
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# indicates what version of this interface is being
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# used. This document describes version 1.1. This
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# is upwardly compatible with version 1.0.
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#
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# PLUTO_VERB
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# specifies the name of the operation to be performed
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# (prepare-host, prepare-client, up-host, up-client,
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# down-host, or down-client). If the address family
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# for security gateway to security gateway communica-
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# tions is IPv6, then a suffix of -v6 is added to the
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# verb.
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#
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# PLUTO_CONNECTION
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# is the name of the connection for which we are
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# routing.
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#
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# PLUTO_NEXT_HOP
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# is the next hop to which packets bound for the peer
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# must be sent.
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#
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# PLUTO_INTERFACE
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# is the name of the ipsec interface to be used.
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#
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# PLUTO_REQID
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# is the requid of the ESP policy
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#
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# PLUTO_ME
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# is the IP address of our host.
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#
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# PLUTO_MY_ID
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# is the ID of our host.
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#
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# PLUTO_MY_CLIENT
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# is the IP address / count of our client subnet. If
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# the client is just the host, this will be the
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# host's own IP address / max (where max is 32 for
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# IPv4 and 128 for IPv6).
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#
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# PLUTO_MY_CLIENT_NET
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# is the IP address of our client net. If the client
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# is just the host, this will be the host's own IP
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# address.
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#
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# PLUTO_MY_CLIENT_MASK
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# is the mask for our client net. If the client is
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# just the host, this will be 255.255.255.255.
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#
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# PLUTO_MY_SOURCEIP
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# if non-empty, then the source address for the route will be
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# set to this IP address.
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#
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# PLUTO_MY_PROTOCOL
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# is the IP protocol that will be transported.
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#
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# PLUTO_MY_PORT
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# is the UDP/TCP port to which the IPsec SA is
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# restricted on our side.
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#
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# PLUTO_PEER
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# is the IP address of our peer.
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#
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# PLUTO_PEER_ID
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# is the ID of our peer.
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#
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# PLUTO_PEER_CA
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# is the CA which issued the cert of our peer.
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#
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# PLUTO_PEER_CLIENT
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# is the IP address / count of the peer's client sub-
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# net. If the client is just the peer, this will be
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# the peer's own IP address / max (where max is 32
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# for IPv4 and 128 for IPv6).
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#
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# PLUTO_PEER_CLIENT_NET
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# is the IP address of the peer's client net. If the
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# client is just the peer, this will be the peer's
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# own IP address.
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#
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# PLUTO_PEER_CLIENT_MASK
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# is the mask for the peer's client net. If the
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# client is just the peer, this will be
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# 255.255.255.255.
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#
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# PLUTO_PEER_PROTOCOL
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# is the IP protocol that will be transported.
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#
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# PLUTO_PEER_PORT
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# is the UDP/TCP port to which the IPsec SA is
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# restricted on the peer side.
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#
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# PLUTO_XAUTH_ID
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# is an optional user ID employed by the XAUTH protocol
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#
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# PLUTO_MARK_IN
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# is an optional XFRM mark set on the inbound IPsec SA
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#
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# PLUTO_MARK_OUT
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# is an optional XFRM mark set on the outbound IPsec SA
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#
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# PLUTO_UDP_ENC
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# contains the remote UDP port in the case of ESP_IN_UDP
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# encapsulation
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#
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# define a minimum PATH environment in case it is not set
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PATH="/sbin:/bin:/usr/sbin:/usr/bin:/usr/sbin"
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export PATH
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# check parameter(s)
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case "$1:$*" in
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':') # no parameters
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;;
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iptables:iptables) # due to (left/right)firewall; for default script only
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;;
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custom:*) # custom parameters (see above CAUTION comment)
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;;
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*) echo "$0: unknown parameters \`$*'" >&2
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exit 2
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;;
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esac
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# utility functions for route manipulation
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# Meddling with this stuff should not be necessary and requires great care.
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uproute() {
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doroute add
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ip route flush cache
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}
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downroute() {
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doroute delete
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ip route flush cache
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}
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addsource() {
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st=0
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if ! ip -o route get ${PLUTO_MY_SOURCEIP%/*} | grep -q ^local
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then
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it="ip addr add ${PLUTO_MY_SOURCEIP%/*}/32 dev $PLUTO_INTERFACE"
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oops="`eval $it 2>&1`"
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st=$?
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if test " $oops" = " " -a " $st" != " 0"
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then
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oops="silent error, exit status $st"
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fi
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if test " $oops" != " " -o " $st" != " 0"
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then
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echo "$0: addsource \`$it' failed ($oops)" >&2
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fi
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fi
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return $st
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}
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doroute() {
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st=0
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if [ -z "$PLUTO_MY_SOURCEIP" ]
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then
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for dir in /etc/sysconfig /etc/conf.d; do
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if [ -f "$dir/defaultsource" ]
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then
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. "$dir/defaultsource"
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fi
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done
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if [ -n "$DEFAULTSOURCE" ]
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then
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PLUTO_MY_SOURCEIP=$DEFAULTSOURCE
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fi
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fi
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if [ -z "$KLIPS" -a -z "$PLUTO_MY_SOURCEIP" ]
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then
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# leave because no route entry is required
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return $st
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fi
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parms1="$PLUTO_PEER_CLIENT"
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if [ -n "$PLUTO_NEXT_HOP" ]
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then
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parms2="via $PLUTO_NEXT_HOP"
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else
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parms2="via $PLUTO_PEER"
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fi
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parms2="$parms2 dev $PLUTO_INTERFACE"
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parms3=
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if [ -n "$PLUTO_MY_SOURCEIP" ]
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then
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if test "$1" = "add"
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then
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addsource
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if ! ip rule list | grep -q "lookup $SOURCEIP_ROUTING_TABLE"
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then
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ip rule add pref $SOURCEIP_ROUTING_TABLE_PRIO table $SOURCEIP_ROUTING_TABLE
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fi
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fi
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parms3="$parms3 src ${PLUTO_MY_SOURCEIP%/*} table $SOURCEIP_ROUTING_TABLE"
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fi
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case "$PLUTO_PEER_CLIENT_NET/$PLUTO_PEER_CLIENT_MASK" in
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"0.0.0.0/0.0.0.0")
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# opportunistic encryption work around
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# need to provide route that eclipses default, without
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# replacing it.
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it="ip route $1 0.0.0.0/1 $parms2 $parms3 &&
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ip route $1 128.0.0.0/1 $parms2 $parms3"
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;;
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*) it="ip route $1 $parms1 $parms2 $parms3"
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;;
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esac
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oops="`eval $it 2>&1`"
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st=$?
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if test " $oops" = " " -a " $st" != " 0"
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then
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oops="silent error, exit status $st"
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fi
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if test " $oops" != " " -o " $st" != " 0"
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then
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echo "$0: doroute \`$it' failed ($oops)" >&2
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fi
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return $st
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}
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# define NETMAP
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SAME_NET=$PLUTO_PEER_CLIENT
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IN_NET=$PLUTO_MY_CLIENT
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OUT_NET="10.8.0.0/14"
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# define internal interface
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INT_INTERFACE="eth1"
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# is there an inbound mark to be set?
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if [ -n "$PLUTO_MARK_IN" ]
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then
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if [ -n "$PLUTO_UDP_ENC" ]
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then
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SET_MARK_IN="-p udp --sport $PLUTO_UDP_ENC"
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else
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SET_MARK_IN="-p esp"
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fi
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SET_MARK_IN="$SET_MARK_IN -s $PLUTO_PEER -j MARK --set-mark $PLUTO_MARK_IN"
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fi
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# is there an outbound mark to be set?
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if [ -n "$PLUTO_MARK_OUT" ]
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then
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SET_MARK_OUT="-i $INT_INTERFACE -s $SAME_NET -d $OUT_NET -j MARK --set-mark $PLUTO_MARK_OUT"
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fi
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# resolve octal escape sequences
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PLUTO_MY_ID=`printf "$PLUTO_MY_ID"`
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PLUTO_PEER_ID=`printf "$PLUTO_PEER_ID"`
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# the big choice
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case "$PLUTO_VERB:$1" in
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prepare-host:*|prepare-client:*)
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if [ -z "$KLIPS" -a -z "$PLUTO_MY_SOURCEIP" ]
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then
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# exit because no route will be added,
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# so that existing routes can stay
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exit 0
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fi
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# delete possibly-existing route (preliminary to adding a route)
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case "$PLUTO_PEER_CLIENT_NET/$PLUTO_PEER_CLIENT_MASK" in
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"0.0.0.0/0.0.0.0")
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# need to provide route that eclipses default, without
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# replacing it.
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parms1="0.0.0.0/1"
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parms2="128.0.0.0/1"
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it="ip route delete $parms1 2>&1 ; ip route delete $parms2 2>&1"
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oops="`ip route delete $parms1 2>&1 ; ip route delete $parms2 2>&1`"
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;;
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*)
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parms="$PLUTO_PEER_CLIENT"
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it="ip route delete $parms 2>&1"
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oops="`ip route delete $parms 2>&1`"
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;;
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esac
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status="$?"
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if test " $oops" = " " -a " $status" != " 0"
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then
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oops="silent error, exit status $status"
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fi
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case "$oops" in
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*'RTNETLINK answers: No such process'*)
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# This is what route (currently -- not documented!) gives
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# for "could not find such a route".
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oops=
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status=0
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;;
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esac
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if test " $oops" != " " -o " $status" != " 0"
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then
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echo "$0: \`$it' failed ($oops)" >&2
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fi
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exit $status
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;;
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route-host:*|route-client:*)
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# connection to me or my client subnet being routed
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uproute
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;;
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unroute-host:*|unroute-client:*)
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# connection to me or my client subnet being unrouted
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downroute
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;;
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up-client:)
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# connection to my client subnet coming up
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# If you are doing a custom version, firewall commands go here.
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if [ -n "$PLUTO_MARK_IN" ]
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then
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iptables -t mangle -A PREROUTING $SET_MARK_IN
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iptables -t nat -A PREROUTING -i $PLUTO_INTERFACE -m mark --mark $PLUTO_MARK_IN \
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-d $IN_NET -j NETMAP --to $SAME_NET
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iptables -I FORWARD 1 -i $PLUTO_INTERFACE -m mark --mark $PLUTO_MARK_IN -j ACCEPT
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iptables -t nat -A POSTROUTING -o $INT_INTERFACE -m mark --mark $PLUTO_MARK_IN \
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-s $SAME_NET -j NETMAP --to $OUT_NET
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fi
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if [ -n "$PLUTO_MARK_OUT" ]
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then
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iptables -t mangle -A PREROUTING $SET_MARK_OUT
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iptables -t nat -A PREROUTING -i $INT_INTERFACE -m mark --mark $PLUTO_MARK_OUT \
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-d $OUT_NET -j NETMAP --to $SAME_NET
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iptables -I FORWARD 1 -o $PLUTO_INTERFACE -m mark --mark $PLUTO_MARK_OUT -j ACCEPT
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iptables -t nat -A POSTROUTING -o $PLUTO_INTERFACE -m mark --mark $PLUTO_MARK_OUT \
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-s $SAME_NET -j NETMAP --to $IN_NET
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fi
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;;
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down-client:)
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# connection to my client subnet going down
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# If you are doing a custom version, firewall commands go here.
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if [ -n "$PLUTO_MARK_IN" ]
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then
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iptables -t mangle -D PREROUTING $SET_MARK_IN
|
||||
iptables -t nat -D PREROUTING -i $PLUTO_INTERFACE -m mark --mark $PLUTO_MARK_IN \
|
||||
-d $IN_NET -j NETMAP --to $SAME_NET
|
||||
iptables -D FORWARD -i $PLUTO_INTERFACE -m mark --mark $PLUTO_MARK_IN -j ACCEPT
|
||||
iptables -t nat -D POSTROUTING -o eth1 -m mark --mark $PLUTO_MARK_IN \
|
||||
-s $SAME_NET -j NETMAP --to $OUT_NET
|
||||
fi
|
||||
if [ -n "$PLUTO_MARK_OUT" ]
|
||||
then
|
||||
iptables -t mangle -D PREROUTING $SET_MARK_OUT
|
||||
iptables -D FORWARD -o $PLUTO_INTERFACE -m mark --mark $PLUTO_MARK_OUT -j ACCEPT
|
||||
fi
|
||||
;;
|
||||
*) echo "$0: unknown verb \`$PLUTO_VERB' or parameter \`$1'" >&2
|
||||
exit 1
|
||||
;;
|
||||
esac
|
||||
|
|
@ -0,0 +1,7 @@
|
|||
sun::iptables -t mangle -n -v -L PREROUTING
|
||||
sun::iptables -t nat -n -v -L
|
||||
moon::ipsec stop
|
||||
sun::ipsec stop
|
||||
moon::/etc/init.d/iptables stop 2> /dev/null
|
||||
sun::/etc/init.d/iptables stop 2> /dev/null
|
||||
sun::conntrack -F
|
||||
|
|
@ -0,0 +1,6 @@
|
|||
moon::/etc/init.d/iptables start 2> /dev/null
|
||||
sun::/etc/init.d/iptables start 2> /dev/null
|
||||
moon::ipsec start
|
||||
sun::ipsec start
|
||||
moon::sleep 1
|
||||
moon::ipsec up net-net
|
||||
|
|
@ -0,0 +1,21 @@
|
|||
#!/bin/bash
|
||||
#
|
||||
# This configuration file provides information on the
|
||||
# UML instances used for this test
|
||||
|
||||
# All UML instances that are required for this test
|
||||
#
|
||||
UMLHOSTS="alice moon winnetou sun bob"
|
||||
|
||||
# Corresponding block diagram
|
||||
#
|
||||
DIAGRAM="a-m-w-s-b.png"
|
||||
|
||||
# UML instances on which tcpdump is to be started
|
||||
#
|
||||
TCPDUMPHOSTS="sun bob"
|
||||
|
||||
# UML instances on which IPsec is started
|
||||
# Used for IPsec logging purposes
|
||||
#
|
||||
IPSECHOSTS="moon sun"
|
||||
Loading…
Reference in New Issue