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.\" ======================================================================== |
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.\" |
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.IX Title "VPE 8" |
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pcg |
1.3 |
.TH VPE 8 "2003-03-26" "0.1" "Virtual Private Ethernet" |
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1.1 |
.SH "NAME" |
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vpe \- Overview of the virtual private ethernet suite. |
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.SH "DESCRIPTION" |
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.IX Header "DESCRIPTION" |
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Vpe is a suite designed to provide a virtual private network for multiple |
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nodes over an untrusted network. |
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.PP |
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\&\*(L"Virtual\*(R" means that no physical network is created (of course), but an |
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ethernet is emulated by creating multiple tunnels between the member |
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1.3 |
nodes. |
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.PP |
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\&\*(L"Private\*(R" means that non-participating nodes cannot decode (\*(L"sniff)\*(R" nor |
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inject (\*(L"spoof\*(R") packets. |
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.PP |
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In the case of vpe, even participating nodes cannot sniff packets send to |
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other nodes or spoof packets as if sent from other nodes. |
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.PP |
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\&\*(L"Network\*(R" means that more than two parties can participate in the |
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network, so for instance it's possible to connect multiple branches of a |
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company into a single network. Many so-called \*(L"vpn\*(R" solutions only create |
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point-to-point tunnels. |
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pcg |
1.1 |
.Sh "\s-1DESIGN\s0 \s-1GOALS\s0" |
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.IX Subsection "DESIGN GOALS" |
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.IP "\s-1SIMPLE\s0 \s-1DESIGN\s0" 4 |
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.IX Item "SIMPLE DESIGN" |
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Cipher, \s-1HMAC\s0 algorithms and other key parameters must be selected |
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at compile time \- this makes it possible to only link in algorithms |
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you actually need. It also makes the crypto part of the source very |
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transparent and easy to inspect. |
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.IP "\s-1EASY\s0 \s-1TO\s0 \s-1SETUP\s0" 4 |
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.IX Item "EASY TO SETUP" |
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A few lines of config (the config file is shared unmodified between all |
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hosts) and a single run of \f(CW\*(C`vpectrl\*(C'\fR to generate the keys suffices to |
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make it work. |
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.IP "MAC-BASED \s-1SECURITY\s0" 4 |
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.IX Item "MAC-BASED SECURITY" |
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Since every host has it's own private key, other hosts cannot spoof |
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traffic from this host. That makes it possible to filter packest by \s-1MAC\s0 |
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address, e.g. to ensure that packets from a specific \s-1IP\s0 address come, in |
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fact, from a specific host. |
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.SH "PROGRAMS" |
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.IX Header "PROGRAMS" |
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Vpe comes with two programs: one daemon (\f(CW\*(C`vped\*(C'\fR) and one control program |
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1.2 |
(\f(CW\*(C`vpectrl\*(C'\fR). |
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1.1 |
.IP "vpectrl" 4 |
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.IX Item "vpectrl" |
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1.2 |
Is used to generate the keys, check and give an overview of of the |
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configuration and contorl the daemon (restarting etc.). |
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1.1 |
.IP "vped" 4 |
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.IX Item "vped" |
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Is the daemon used to establish and maintain conenctions to the other |
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network members. It should be run on the gateway machine. |
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1.2 |
.SH "COMPILETIME CONFIGURATION" |
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.IX Header "COMPILETIME CONFIGURATION" |
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Here are a few recipes for compiling your vpe: |
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1.1 |
.Sh "\s-1AS\s0 \s-1LOW\s0 \s-1PACKET\s0 \s-1OVERHEAD\s0 \s-1AS\s0 \s-1POSSIBLE\s0" |
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.IX Subsection "AS LOW PACKET OVERHEAD AS POSSIBLE" |
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.Vb 1 |
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1.2 |
\& ./configure --enable-hmac-length=4 --enable-rand-length=0 |
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1.1 |
.Ve |
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.PP |
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1.2 |
Minimize the header overhead of \s-1VPN\s0 packets (the above will result in only |
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4 bytes of overhead over the raw ethernet frame). |
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1.1 |
.Sh "\s-1MINIMIZE\s0 \s-1CPU\s0 \s-1TIME\s0 \s-1REQUIRED\s0" |
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.IX Subsection "MINIMIZE CPU TIME REQUIRED" |
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.Vb 1 |
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1.2 |
\& ./configure --enable-cipher=bf --enable-digest=md4 |
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1.1 |
.Ve |
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.PP |
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1.2 |
Use the fastest cipher and digest algorithms currently available in vpe. |
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1.1 |
.Sh "\s-1MAXIMIZE\s0 \s-1SECURITY\s0" |
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.IX Subsection "MAXIMIZE SECURITY" |
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.Vb 1 |
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1.2 |
\& ./configure --enable-hmac-length=16 --enable-rand-length=8 --enable-digest=sha1 |
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1.1 |
.Ve |
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.PP |
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1.2 |
This uses a 16 byte \s-1HMAC\s0 checksum to authenticate packets (I guess 8\-12 |
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would also be pretty secure ;) and will additionally prefix each packet |
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with 8 bytes of random data. |
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.PP |
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1.1 |
In general, remember that \s-1AES\-128\s0 seems to be more secure and faster than |
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1.2 |
\&\s-1AES\-192\s0 or \s-1AES\-256\s0, more randomness helps against sniffing and a longer |
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\&\s-1HMAC\s0 helps against spoofing. \s-1MD4\s0 is a fast digest, \s-1SHA1\s0 or \s-1RIPEMD160\s0 are |
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better, and Blowfish is a fast cipher (and also quite secure). |
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pcg |
1.1 |
.SH "HOW TO SET UP A SIMPLE VPN" |
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.IX Header "HOW TO SET UP A SIMPLE VPN" |
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In this section I will describe how to get a simple \s-1VPN\s0 consisting of |
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three hosts up and running. |
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.Sh "\s-1STEP\s0 1: configuration" |
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.IX Subsection "STEP 1: configuration" |
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First you have to create a daemon configuation file and put it into the |
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configuration directory. This is usually \f(CW\*(C`/etc/vpe\*(C'\fR, depending on how you |
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configured vpe, and can be overwritten using the \f(CW\*(C`\-c\*(C'\fR commandline switch. |
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.PP |
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Put the following lines into \f(CW\*(C`/etc/vpe/vped.conf\*(C'\fR: |
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.PP |
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.Vb 3 |
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1.2 |
\& udp-port = 50000 # the external port to listen on (configure your firewall) |
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\& mtu = 1400 # minimum MTU of all outgoing interfaces on all hosts |
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\& ifname = vpn0 # the local network device name |
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1.1 |
.Ve |
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.PP |
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.Vb 2 |
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1.2 |
\& node = first # just a nickname |
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\& hostname = first.example.net # the DNS name or IP address of the host |
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1.1 |
.Ve |
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.PP |
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.Vb 2 |
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1.2 |
\& node = second |
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\& hostname = 133.55.82.9 |
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1.1 |
.Ve |
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.PP |
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.Vb 2 |
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1.2 |
\& node = third |
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\& hostname = third.example.net |
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1.1 |
.Ve |
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.PP |
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The only other file neccessary if the \f(CW\*(C`if\-up\*(C'\fR script that initializes the |
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local ethernet interface. Put the following lines into \f(CW\*(C`/etc/vpe/if\-up\*(C'\fR |
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and make it execute (\f(CW\*(C`chmod 755 /etc/vpe/if\-up\*(C'\fR): |
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.PP |
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.Vb 6 |
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1.2 |
\& #!/bin/sh |
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\& ip link set $IFNAME address $MAC mtu $MTU up |
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\& [ $NODENAME = first ] && ip addr add 10.0.1.1 dev $IFNAME |
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\& [ $NODENAME = second ] && ip addr add 10.0.2.1 dev $IFNAME |
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\& [ $NODENAME = third ] && ip addr add 10.0.3.1 dev $IFNAME |
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\& ip route add 10.0.0.0/16 dev $IFNAME |
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pcg |
1.1 |
.Ve |
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.PP |
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This script will give each node a different \s-1IP\s0 address in the \f(CW\*(C`10.0/16\*(C'\fR |
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network. The internal network (e.g. the \f(CW\*(C`eth0\*(C'\fR interface) should then be |
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set to a subset of that network, e.g. \f(CW\*(C`10.0.1.0/24\*(C'\fR on node \f(CW\*(C`first\*(C'\fR, |
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\&\f(CW\*(C`10.0.2.0/24\*(C'\fR on node \f(CW\*(C`second\*(C'\fR, and so on. |
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.PP |
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By enabling routing on the gateway host that runs \f(CW\*(C`vped\*(C'\fR all nodes will |
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be able to reach the other nodes. You can, of course, also use proxy arp |
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or other means of pseudo-bridging (or even real briding), or (best) full |
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routing \- the choice is yours. |
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.Sh "\s-1STEP\s0 2: create the \s-1RSA\s0 key pairs for all hosts" |
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.IX Subsection "STEP 2: create the RSA key pairs for all hosts" |
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Run the following command to generate all key pairs (that might take a |
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while): |
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.PP |
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.Vb 1 |
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1.2 |
\& vpectrl -c /etc/vpe -g |
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1.1 |
.Ve |
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.PP |
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This command will put the public keys into \f(CW\*(C`/etc/vpe/pubkeys/\f(CInodename\f(CW\*(C'\fR and the private keys into \f(CW\*(C`/etc/vpe/hostkeys/\f(CInodename\f(CW\*(C'\fR. |
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.Sh "\s-1STEP\s0 3: distribute the config files to all nodes" |
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.IX Subsection "STEP 3: distribute the config files to all nodes" |
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Now distribute the config files to the other nodes. This should be done in two steps, since the |
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private keys should not be distributed. The example uses rsync-over-ssh |
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.PP |
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First all the config files without the hostkeys should be distributed: |
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.PP |
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.Vb 3 |
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1.2 |
\& rsync -avzessh /etc/vpe first.example.net:/etc/. --exclude hostkeys |
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\& rsync -avzessh /etc/vpe 133.55.82.9:/etc/. --exclude hostkeys |
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\& rsync -avzessh /etc/vpe third.example.net:/etc/. --exclude hostkeys |
| 293 |
pcg |
1.1 |
.Ve |
| 294 |
|
|
.PP |
| 295 |
|
|
Then the hostkeys should be copied: |
| 296 |
|
|
.PP |
| 297 |
|
|
.Vb 3 |
| 298 |
pcg |
1.2 |
\& rsync -avzessh /etc/vpe/hostkeys/first first.example.net:/etc/hostkey |
| 299 |
|
|
\& rsync -avzessh /etc/vpe/hostkeys/second 133.55.82.9:/etc/hostkey |
| 300 |
|
|
\& rsync -avzessh /etc/vpe/hostkeys/third third.example.net:/etc/hostkey |
| 301 |
pcg |
1.1 |
.Ve |
| 302 |
|
|
.PP |
| 303 |
|
|
You should now check the configration by issuing the command \f(CW\*(C`vpectrl \-c |
| 304 |
|
|
/etc/vpe \-s\*(C'\fR on each node and verify it's output. |
| 305 |
|
|
.Sh "\s-1STEP\s0 4: starting vped" |
| 306 |
|
|
.IX Subsection "STEP 4: starting vped" |
| 307 |
|
|
You should then start vped on each node by issuing a command like: |
| 308 |
|
|
.PP |
| 309 |
|
|
.Vb 1 |
| 310 |
pcg |
1.2 |
\& vped -D -linfo first # first is the nodename |
| 311 |
pcg |
1.1 |
.Ve |
| 312 |
|
|
.PP |
| 313 |
|
|
This will make the vped stay in foreground. You should then see |
| 314 |
|
|
\&\*(L"connection established\*(R" messages. If you don't see them check your |
| 315 |
|
|
firewall and routing (use tcpdump ;). |
| 316 |
|
|
.PP |
| 317 |
|
|
If this works you should check your networking setup by pinging various |
| 318 |
|
|
endpoints. |
| 319 |
|
|
.PP |
| 320 |
|
|
To make vped run more permanently you can either run it as a daemon |
| 321 |
|
|
(by starting it without the \f(CW\*(C`\-D\*(C'\fR switch), or, much better, from your |
| 322 |
|
|
inittab. I use a line like this on my systems: |
| 323 |
|
|
.PP |
| 324 |
|
|
.Vb 1 |
| 325 |
pcg |
1.2 |
\& t1:2345:respawn:/opt/vpe/sbin/vped -D -L first >/dev/null 2>&1 |
| 326 |
pcg |
1.1 |
.Ve |
| 327 |
|
|
.Sh "\s-1STEP\s0 5: enjoy" |
| 328 |
|
|
.IX Subsection "STEP 5: enjoy" |
| 329 |
|
|
\&... and play around. Sending a \-HUP (\f(CW\*(C`vpectrl \-kHUP\*(C'\fR) to the daemon |
| 330 |
|
|
will make it try to connect to all other nodes again. If you run it from |
| 331 |
|
|
inittab, as is recommended, \f(CW\*(C`vpectrl \-k\*(C'\fR (or simply \f(CW\*(C`killall vped\*(C'\fR) will |
| 332 |
|
|
kill the daemon, start it again, making it read it's configuration files |
| 333 |
|
|
again. |
| 334 |
|
|
.SH "SEE ALSO" |
| 335 |
|
|
.IX Header "SEE ALSO" |
| 336 |
|
|
\&\fIvpe\fR\|(8), \fIvpectrl\fR\|(8), \fIvped.conf\fR\|(5). |
| 337 |
|
|
.SH "AUTHOR" |
| 338 |
|
|
.IX Header "AUTHOR" |
| 339 |
|
|
Marc Lehmann <vpe@plan9.de> |
