Thanks to everyone, this is absolutely great, it finally works.
Added this rules to the firewall config (hope this is not exposing the
internal network to attacks....) and now packets are not dropped.
#packets hitting eth0 coming from remote network directed to
#internal network accepted
$IPTABLES -A INPUT -i $EXTIF -s ${remotenetwork} -d $INTNET -j ACCEPT
#
$IPTABLES -A INPUT -p 51 -j ACCEPT
$IPTABLES -A INPUT -p 50 -j ACCEPT
$IPTABLES -A INPUT -p udp --sport 500 --dport 500 -j ACCEPT
#anything directed to remote network accepted
#perhaps there's a safer way of writing this rule
$IPTABLES -A OUTPUT -d ${remotenetwork} -j ACCEPT
#
$IPTABLES -A OUTPUT -p udp --sport 500 --dport 500 -j ACCEPT
$IPTABLES -A OUTPUT -p 51 -j ACCEPT
$IPTABLES -A OUTPUT -p 50 -j ACCEPT
#enable forward from and to remote network
$IPTABLES -A FORWARD -s $INTNET -d ${remotenetwork} -j ACCEPT
$IPTABLES -A FORWARD -s ${remotenetwork} -d $INTNET -j ACCEPT
$IPTABLES -t nat -A POSTROUTING -o $EXTIF -d\! 192.168.100.0/24 -j SNAT
--to $EXTIP
Think this is going to harm the firewall?
Thanks again, this list is amazing!
Have a nice day
Simone
On Wed, 2005-05-25 at 16:04, Maciej Żenczykowski wrote:
> Are you sure your iptables isn't dropping the packets?
> VPN and other tunneled packets go through the firewall _twice_!
> First before unpacking they come from the physical ethernet interface
> and head for INPUT chain (they're going INTO the kernel).
> Next the kernel unpacks them.
> And the unpacked packet goes through the firewall again - this time
> incoming from the VPN virtual interface
> (and likely going for the FORWARD
> chain) - are you sure they're not being dropped here?
> and in reverse incoming packets for the VPN first go through FORWARD
> heading for the virtual VPN interface then get packaged ang go through the
> OUTPUT chain (source being the kernel) heading for the physical ethernet
> interface...
>
> Cheers,
> MaZe.
>
> On Wed, 25 May 2005, simone wrote:
>
> > Hi all, first of all I want to apologize for the very long email. This
> > is driving me crazy and in 4 days our current VPN will be dead.
> >
> > Started over, reconfigured cisco pix following cisco vpn guide and
> > http://www.johnleach.co.uk/documents/freeswan-pix/freeswan-pix.html
> > (differences in no-xauth no-config-mode, lifetime 28800 and
> > esp-md5-hmac). Modified rule in firewall, added
> > $IPTABLES -t nat -A POSTROUTING -o $EXTIF -s 192.168.10.0/24 -d\!
> > 192.168.100.0/24 -j MASQUERADE
> > not to nat packets going to 192.168.100.0 (am I right?), started ipsec
> > and connection on the linux box, public ip 162.x.x.90 private network
> > 192.168.10.x this is the result of setkey -DP
> >
> > 192.168.100.0/24[any] 192.168.10.0/24[any] any
> > in ipsec
> > esp/tunnel/182.xxx.xxx.130-162.xxx.xxx.90/unique#16385
> > created: May 25 14:19:10 2005 lastused:
> > lifetime: 0(s) validtime: 0(s)
> > spid=992 seq=8 pid=14415
> > refcnt=1
> > 192.168.10.0/24[any] 192.168.100.0/24[any] any
> > out ipsec
> > esp/tunnel/162.xxx.xxx.90-182.xxx.xxx.130/unique#16385
> > created: May 25 14:19:10 2005 lastused: May 25 15:42:21 2005
> > lifetime: 0(s) validtime: 0(s)
> > spid=1009 seq=7 pid=14415
> > refcnt=2
> > 192.168.100.0/24[any] 192.168.10.0/24[any] any -----> 192.168.100.0/24
> > is the cisco private network, is this correct?
> > fwd ipsec
> > esp/tunnel/182.xxx.xxx.130-162.xxx.xxx.90/unique#16385
> > created: May 25 14:19:10 2005 lastused:
> > lifetime: 0(s) validtime: 0(s)
> > spid=1002 seq=6 pid=14415
> > refcnt=1
> > 0.0.0.0/0[any] 0.0.0.0/0[any] any
> > in none
> > created: May 25 14:18:40 2005 lastused:
> > lifetime: 0(s) validtime: 0(s)
> > spid=979 seq=5 pid=14415
> > refcnt=1
> > 0.0.0.0/0[any] 0.0.0.0/0[any] any
> > in none
> > created: May 25 14:18:40 2005 lastused: May 25 15:18:31 2005
> > lifetime: 0(s) validtime: 0(s)
> > spid=963 seq=4 pid=14415
> > refcnt=1
> > 0.0.0.0/0[any] 0.0.0.0/0[any] any
> > in none
> > created: May 25 14:18:40 2005 lastused:
> > lifetime: 0(s) validtime: 0(s)
> > spid=947 seq=3 pid=14415
> > refcnt=1
> > 0.0.0.0/0[any] 0.0.0.0/0[any] any
> > out none
> > created: May 25 14:18:40 2005 lastused:
> > lifetime: 0(s) validtime: 0(s)
> > spid=988 seq=2 pid=14415
> > refcnt=1
> > 0.0.0.0/0[any] 0.0.0.0/0[any] any
> > out none
> > created: May 25 14:18:40 2005 lastused: May 25 15:18:33 2005
> > lifetime: 0(s) validtime: 0(s)
> > spid=972 seq=1 pid=14415
> > refcnt=1
> > 0.0.0.0/0[any] 0.0.0.0/0[any] any
> > out none
> > created: May 25 14:18:40 2005 lastused:
> > lifetime: 0(s) validtime: 0(s)
> > spid=956 seq=0 pid=14415
> > refcnt=1
> >
> > if I issue the route command I get
> >
> > 192.168.100.0 * 255.255.255.0 U 0 0 0 eth0
> > 192.168.100.0 ip-pub. 255.255.255.0 UG 0 0 0 eth0
> > 192.168.10.0 * 255.255.255.0 U 0 0 0
> > eth1
> >
> > where eth1 is 192.168.10.3 and eth0 is ip-pub. = 162.xxx.xxx.90.
> >
> > ipsec auto status:
> >
> > "milan" esp.f02a7d60 at 182.xxx.xxx.130 esp.f8d6586b at 162.xxx.xxx.90
> > tun.0 at 182.xxx.xxx.130 tun.0 at 162.xxx.xxx.90
> >
> > It looks to me that the vpn is estabilished, but still cannot ping from
> > one end to the other....
> >
> > ping 192.168.100.26 -l 192.168.10.3 or even ping from another linuxbox
> > that's actually natted behind this machine (and can see the web).
> >
> >
> > Any suggestion on where to look for troubleshooting will be very
> > appreciated, have a nice day.
> >
> > Simone
> >
> >
> > On Tue, 2005-05-24 at 17:07, Peter Farrow wrote:
> >> Hi there,
> >>
> >> the "RESTRICT..." is one of my own iptables rules, which is called from
> >> the INPUT and FORWARD chains which provides a nice convenient point to
> >> add it all in in one go.
> >>
> >> You should see routes like this if your tunnels are up
> >>
> >> 192.168.12.0 ch-rtr.farrows. 255.255.255.0 UG 0 0 0
> >> ipsec0
> >>
> >> issue the route command and see what you get
> >>
> >> Don't worry about having long conversations about this: its tricky if
> >> you have not done it before and I will help as long as it takes
> >>
> >> Pete
> >>
> >>
> >> Simone wrote:
> >>
> >>> Here again, I don't think I understand what
> >>> "RESTRICT_EXTERNAL_CONNECTIONS" means. I think I enabled the firewall
> >>> to accept anything that comes from the external pix IP, the pix
> >>> gateway IP and the cisco internal lan, so to be sure it is not dropped
> >>> (not really a iptables guru so I could be wrong). Some strange
> >>> behaviour include tha fact I can ping from linux to cisco on the
> >>> public IP but not vice versa, while from another site I can ping the
> >>> public linux box ip (so it looks like it is not dropped by the
> >>> firewall config).
> >>> I am sorry if this is going far too long. Something that's not clear
> >>> to me is if a device called ipsec0 or whatever I call the connection,
> >>> should show up somewhere and if a route should be provided to reach
> >>> the cisco internal network from the linux internal network. Anything
> >>> could help to figure this out? Firewall rules?
> >>>
> >>> Thanks, have a nice day
> >>>
> >>> Peter Farrow wrote:
> >>>
> >>>> If your seeing the communication like this its not being dumped or
> >>>> dropped by your firewall, you could add an accept rule for all
> >>>> protocols from the far end Ips at each site, just for debugging
> >>>> purposes and to rule out the firewall itself..
> >>>>
> >>>> This is almost there now, make sure that you have lines like this in
> >>>> your firewall:
> >>>>
> >>>> $IPTABLES -A RESTRICT_EXTERNAL_CONNECTIONS -m state --state
> >>>> ESTABLISHED,RELATED -j ACCEPT
> >>>> $IPTABLES -A RESTRICT_EXTERNAL_CONNECTIONS -m state --state NEW
> >>>> --in-interface ! $EXT_IFACE -j ACCEPT
> >>>>
> >>>> $IPTABLES -A INPUT -j RESTRICT_EXTERNAL_CONNECTIONS
> >>>> $IPTABLES -A FORWARD -j RESTRICT_EXTERNAL_CONNECTIONS
> >>>>
> >>>> Notice I accept all new interfaces on anything that's not the
> >>>> external network card, this automatically includes lo, internet
> >>>> ethernet and all ipsec interfaces you will of course need to change
> >>>> these to suit your firewall config....
> >>>>
> >>>> Becareful (dont use it unmodified) using a rule like this if you have
> >>>> more than one external [untrusted] interface....
> >>>>
> >>>>
> >>>> P.
> >>>>
> >>>>
> >>>> simone wrote:
> >>>>
> >>>>> Hi there. Installed openswan, and followed the instructions :) . It
> >>>>> looks like tunnel is estabilished now:
> >>>>>
> >>>>> May 24 14:19:33 fbctestvpn pluto[7063]: "milan" #1: initiating Main
> >>>>> Mode
> >>>>> May 24 14:19:33 fbctestvpn pluto[7063]: | no IKE algorithms for this
> >>>>> connection ---> is this bad....
> >>>>> May 24 14:19:33 fbctestvpn pluto[7063]: "milan" #1: transition from
> >>>>> state STATE_MAIN_I1 to state STATE_MAIN_I2
> >>>>> May 24 14:19:33 fbctestvpn pluto[7063]: "milan" #1: received Vendor ID
> >>>>> payload [XAUTH]
> >>>>> May 24 14:19:33 fbctestvpn pluto[7063]: "milan" #1: received Vendor ID
> >>>>> payload [Dead Peer Detection]
> >>>>> May 24 14:19:33 fbctestvpn pluto[7063]: "milan" #1: received Vendor ID
> >>>>> payload [Cisco-Unity]
> >>>>> May 24 14:19:33 fbctestvpn pluto[7063]: "milan" #1: ignoring unknown
> >>>>> Vendor ID payload [xxxxxxxxxxxxxxxxxxxxxxx]
> >>>>> May 24 14:19:33 fbctestvpn pluto[7063]: "milan" #1: I did not send a
> >>>>> certificate because I do not have one.
> >>>>> May 24 14:19:33 fbctestvpn pluto[7063]: "milan" #1: transition from
> >>>>> state STATE_MAIN_I2 to state STATE_MAIN_I3
> >>>>> May 24 14:19:33 fbctestvpn pluto[7063]: "milan" #1: Main mode peer
> >>>>> ID is
> >>>>> ID_IPV4_ADDR: 'xxx.xxx.xxx.130' --> this being the external ip of the
> >>>>> cisco pix 525
> >>>>> May 24 14:19:33 fbctestvpn pluto[7063]: "milan" #1: transition from
> >>>>> state STATE_MAIN_I3 to state STATE_MAIN_I4
> >>>>> May 24 14:19:33 fbctestvpn pluto[7063]: "milan" #1: ISAKMP SA
> >>>>> established
> >>>>> May 24 14:19:33 fbctestvpn pluto[7063]: "milan" #2: initiating Quick
> >>>>> Mode PSK+ENCRYPT+TUNNEL+UP {using isakmp#1}
> >>>>> May 24 14:19:33 fbctestvpn pluto[7063]: "milan" #1: ignoring
> >>>>> informational payload, type IPSEC_INITIAL_CONTACT
> >>>>> May 24 14:19:33 fbctestvpn pluto[7063]: "milan" #1: received and
> >>>>> ignored
> >>>>> informational message
> >>>>> May 24 14:19:33 fbctestvpn pluto[7063]: "milan" #2: ignoring
> >>>>> informational payload, type IPSEC_RESPONDER_LIFETIME
> >>>>> May 24 14:19:33 fbctestvpn pluto[7063]: "milan" #2: transition from
> >>>>> state STATE_QUICK_I1 to state STATE_QUICK_I2
> >>>>> May 24 14:19:33 fbctestvpn pluto[7063]: "milan" #2: sent QI2, IPsec SA
> >>>>> established {ESP=>0x6xxx23f <0x07xxxx7}
> >>>>>
> >>>>> 000 "milan":
> >>>>> 192.168.10.0/24===xxx.xxx.xxx.90---xxx.xxx.xxx.65...xxx.xxx.xxx.129---xxx.xxx.xxx.130===192.168.100.0/24;
> >>>>> unrouted; eroute owner: #0
> >>>>>
> >>>>> 192.168.10.3 internal linux box ip (and default gateway for the natted
> >>>>> workstations)
> >>>>> 192.168.100.2 internal cisco pix ip (and default gateway for the natted
> >>>>> workstations)
> >>>>>
> >>>>> conn milan left=xxx.xxx.xxx.90
> >>>>> public ip linux box leftnexthop=xxx.xxx.xxx.65
> >>>>> default gateway linux leftsubnet=192.168.10.0/24
> >>>>> right=xxx.xxx.xxx.130 public ip cisco
> >>>>> rightsubnet=192.168.100.0/24 network behind cisco
> >>>>> rightnexthop=xxx.xxx.xxx.129 default gateway cisco
> >>>>> authby=secret
> >>>>> pfs=no auto=add
> >>>>> esp=3des-md5-96
> >>>>> The firewall on the linuxbox is natting the 192.168.10.x network and
> >>>>> accepting anything coming from 192.168.100.x, I added udp port 500 to
> >>>>> INPUT and OUTPUT chains in iptables, but still cannot ping (even from
> >>>>> other workstations) or reach a web page on the other network. Anything
> >>>>> else I am missing or should be looking for?
> >>>>>
> >>>>>
> >>>>>> Remember you will need to allow the ipsec interface in your firewall
> >>>>>>
> >>>>>
> >>>>> How do I do this?
> >>>>> Thanks for all your help, really appreciate this.
> >>>>> Simone
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>> On Tue, 2005-05-24 at 01:35, Peter Farrow wrote:
> >>>>>
> >>>>>
> >>>>>> Hi there, yes it was with a Nortel contivity on a few occassions and
> >>>>>> the other times with a Cisco pix. interstingly enough the Cisco VPNs
> >>>>>> often required updates to the IOS to make them 3Des compliant,
> >>>>>> As its late here in the UK (past midnight GMT+1) here is a very quick
> >>>>>> and dirty freeswan guide.
> >>>>>>
> >>>>>> Needless to say the things that cause the biggest headache for most
> >>>>>> users is the use of RSA keys and opportunistic encryption. Since this
> >>>>>> is NOT what 99.9% of the masses need or want then there is a quick and
> >>>>>> simple and just as secure alternative setup, but its not that well
> >>>>>> documented. Opportunistic encryption came in versions 2 and above of
> >>>>>> freeswan by default, this has the effect of clobbering the network
> >>>>>> default route and replacing it down the ipsec interface (what you want
> >>>>>> if you want to encrypt everything, but not really any great use in the
> >>>>>> real world). Most people want to do site <-> site vpns and these are
> >>>>>> best achieved without opportunistic encryption and by the use of
> >>>>>> preshared keys.
> >>>>>>
> >>>>>> 1)Make sure you get a version of freeswan suitable for your kernel, if
> >>>>>> you can't find one go to somewhere like rpms.pbone.net and find a
> >>>>>> kernel for which there is a freeswan version. Many people try and
> >>>>>> hunt a freeswan version to match their kernel, I do it the otherway
> >>>>>> round, find the latest freeswan compatible kernel you can for your
> >>>>>> architecture, you can always compile it from source but why my life
> >>>>>> harder for yourself.
> >>>>>> 2)get the freeswan module for the kernel you found, and the same
> >>>>>> freeswan-userland version as well. then proceed as follows: after you
> >>>>>> have installed the [from rpm]
> >>>>>>
> >>>>>>
> >>>>>> Typically to kill opportunistic encryption add these lines to your
> >>>>>> ipsec.conf file: after the config setup section near the top,
> >>>>>>
> >>>>>> conn block
> >>>>>> auto=ignore
> >>>>>>
> >>>>>> conn private
> >>>>>> auto=ignore
> >>>>>>
> >>>>>> conn private-or-clear
> >>>>>> auto=ignore
> >>>>>>
> >>>>>> conn clear-or-private
> >>>>>> auto=ignore
> >>>>>>
> >>>>>> conn clear
> >>>>>> auto=ignore
> >>>>>>
> >>>>>> conn packetdefault
> >>>>>> auto=ignore
> >>>>>>
> >>>>>> Doing this stops all the crap you get when ipsec starts and then kicks
> >>>>>> you off the system about 60 seconds later if you're connected remotely
> >>>>>> as this kills the opportunistic setup feature. Do the same at the
> >>>>>> other end as well.
> >>>>>> Then start the service.
> >>>>>>
> >>>>>> Then add a section for each tunnel you want to set up. if you have
> >>>>>> multiple subnets at each site which can't be encapsulated in a single
> >>>>>> subnet declaration, you will need to add a new tunnel defintion for
> >>>>>> each. Here is an example :
> >>>>>>
> >>>>>> conn site1-site2 #this is the connection name
> >>>>>> [tunnel] identifier
> >>>>>> left=21.21.100.10 #This is the ip address of the
> >>>>>> first linux box
> >>>>>> leftnexthop=21.21.100.9 #This is usually set to the
> >>>>>> defualt gateway for the first linux box
> >>>>>> leftsubnet=10.11.2.0/24 #This is the LAN subnet behind
> >>>>>> the first linux box
> >>>>>> right=21.21.100.178 #This is the IP address of the
> >>>>>> second linux box at the other end of the tunnel
> >>>>>> rightsubnet=10.11.4.0/24 #This is the LAN subnet behind
> >>>>>> the second linux box
> >>>>>> rightnexthop=21.21.100.177 #This is the IP address of the
> >>>>>> default gateway setting of the other linux box
> >>>>>> authby=secret #We are going to use a
> >>>>>> "password" or secret to encrypt/auth the link
> >>>>>> pfs=no #Turn off perfect forward
> >>>>>> security, this makes it faster and easier but less secure
> >>>>>> auto=add #Authorise but don't start
> >>>>>> esp=3des-md5-96 #encapsulating security payload
> >>>>>> setting, encryption used for auth and data
> >>>>>>
> >>>>>>
> >>>>>> Now cut and paste this and add it to the ipsec.conf file on the second
> >>>>>> machine completely as is, unmodified.
> >>>>>>
> >>>>>> Then in you /etc/ipsec.secrets file on each machine you will need to
> >>>>>> add a password [secret] for each each of the tunnels you have
> >>>>>> specified, in the above example we would have:
> >>>>>>
> >>>>>> 21.21.100.10 21.21.100.178 : PSK "a-passwordin-here-with-the-quotes"
> >>>>>>
> >>>>>> Add this to the very top of the ipsec secrets file, one entry for each
> >>>>>> pair of machines in this format
> >>>>>>
> >>>>>> leftmachineip rightmachineip : PSK "password"
> >>>>>>
> >>>>>> Then do a service ipsec restart on each machine, bring the link up
> >>>>>> with this command, it only needs to be invoked from either one of the
> >>>>>> ends
> >>>>>>
> >>>>>> ipsec auto --up site1-site2
> >>>>>>
> >>>>>> You should get output like this if you did it right:
> >>>>>> ipsec auto --up site1-site2
> >>>>>> 104 "site1-site2" #2086: STATE_MAIN_I1: initiate
> >>>>>> 106 "site1-site2" #2086: STATE_MAIN_I2: sent MI2, expecting MR2
> >>>>>> 108 "site1-site2" #2086: STATE_MAIN_I3: sent MI3, expecting MR3
> >>>>>> 004 "site1-site2" #2086: STATE_MAIN_I4: ISAKMP SA established
> >>>>>> 112 "site1-site2" #2087: STATE_QUICK_I1: initiate
> >>>>>> 004 "site1-site2" #2087: STATE_QUICK_I2: sent QI2, IPsec SA
> >>>>>> established
> >>>>>>
> >>>>>> Remember you will need to allow the ipsec interface in your firewall
> >>>>>> and you will need to add lines like this:
> >>>>>>
> >>>>>> # Accept udp connections to port 500 for ipsec
> >>>>>> $IPTABLES -A INPUT -p udp --sport 500 --dport 500 -j ACCEPT
> >>>>>> $IPTABLES -A OUTPUT -p udp --sport 500 --dport 500 -j ACCEPT
> >>>>>>
> >>>>>> This is just about the quickest way to set up a VPN tunnel with
> >>>>>> Freeswan, it takes minutes. If you want to make if more secure, you
> >>>>>> can tune the config once you get it running this way!
> >>>>>>
> >>>>>> Remember the only machines that can't see the full extent of the other
> >>>>>> LAN network are the linux boxes creating the tunnel. So the left
> >>>>>> linux box will not be able to ping stuff on 10.11.4.0/24 network and
> >>>>>> the right linux box will not be able to ping stuff on 10.11.2.0/24
> >>>>>> network - don't forget this.... its commonly mistaken by some to mean
> >>>>>> the tunnel isn't working, to truly test it end to end you need hosts
> >>>>>> on the LANs at each end to ping each other.
> >>>>>>
> >>>>>> If you want to make it work through NATing gateways you will need to
> >>>>>> port forward the udp 500 setting above on your firewall.
> >>>>>>
> >>>>>> Enjoy!
> >>>>>>
> >>>>>> Pete
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>> Kennedy Clark wrote:
> >>>>>>
> >>>>>>
> >>>>>>> Any chance of getting a quick HOW-TO posted to the group for that?
> >>>>>>> ;-) Sounds interesting.
> >>>>>>>
> >>>>>>> I saw your post about using it with Cisco & Nortel equipment -- I
> >>>>>>> work
> >>>>>>> with both a lot at my current customer. What types of equipment have
> >>>>>>> you used it with from both vendors (e.g., Cisco: IOS, PIX, VPN3K;
> >>>>>>> Nortel = Contivity)?
> >>>>>>>
> >>>>>>> Thanks!!
> >>>>>>> Kennedy
> >>>>>>>
> >>>>>>>
> >>>>>>
> >>>>>> ______________________________________________________________________
> >>>>>> _______________________________________________
> >>>>>> CentOS mailing list
> >>>>>> CentOS at centos.org
> >>>>>> http://lists.centos.org/mailman/listinfo/centos
> >>>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
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