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.\" ======================================================================== |
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.\" |
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.IX Title "GVPE 5" |
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pcg |
1.3 |
.TH GVPE 5 "2005-01-27" "1.7" "GNU Virtual Private Ethernet" |
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pcg |
1.1 |
.SH "NAME" |
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GNU\-VPE \- Overview of the GNU Virtual Private Ethernet suite. |
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.SH "DESCRIPTION" |
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.IX Header "DESCRIPTION" |
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\&\s-1GVPE\s0 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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1.3 |
.IP "\(bu" 4 |
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.IX Xref "Virtual" |
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Virtual means that no physical network is created (of course), but an |
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1.1 |
ethernet is emulated by creating multiple tunnels between the member |
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nodes. |
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pcg |
1.3 |
.IP "\(bu" 4 |
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.IX Xref "Private" |
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Private means that non-participating nodes cannot decode (\*(L"sniff)\*(R" nor |
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1.1 |
inject (\*(L"spoof\*(R") packets. |
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1.3 |
.Sp |
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1.1 |
In the case of gvpe, 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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pcg |
1.3 |
.IP "\(bu" 4 |
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.IX Xref "Network" |
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Network means that more than two parties can participate in the network, |
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so for instance it's possible to connect multiple branches of a company |
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into a single network. Many so-called \*(L"vpn\*(R" solutions only create |
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pcg |
1.1 |
point-to-point tunnels. |
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.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`gvpectrl\*(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 packet 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 that is associated with that \s-1IP\s0 and not from |
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another 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`gvpe\*(C'\fR) and one control program |
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(\f(CW\*(C`gvpectrl\*(C'\fR). |
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.IP "gvpectrl" 4 |
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.IX Item "gvpectrl" |
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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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.IP "gvpe" 4 |
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.IX Item "gvpe" |
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Is the daemon used to establish and maintain connections to the other |
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network members. It should be run on the gateway machine. |
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.SH "COMPILETIME CONFIGURATION" |
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.IX Header "COMPILETIME CONFIGURATION" |
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Please have a look at the \f(CW\*(C`gvpe.osdep(5)\*(C'\fR manpage for platform-specific |
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information. |
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.PP |
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1.4 |
Here are a few recipes for compiling your gvpe, showing the extremes |
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(fast, small, insecure \s-1OR\s0 slow, large, more secure), between you should |
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choose: |
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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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\& ./configure --enable-hmac-length=4 --enable-rand-length=0 |
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.Ve |
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.PP |
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1.4 |
Minimize the header overhead of \s-1VPN\s0 packets (the above will result in |
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only 4 bytes of overhead over the raw ethernet frame). This is a insecure |
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configuration because a \s-1HMAC\s0 length of 4 makes collision attacks based on |
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the birthday paradox easy, though. |
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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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\& ./configure --enable-cipher=bf --enable-digest=md4 |
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.Ve |
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.PP |
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1.4 |
Use the fastest cipher and digest algorithms currently available in |
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gvpe. \s-1MD4\s0 has been broken and is quite insecure, though. |
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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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\& ./configure --enable-hmac-length=16 --enable-rand-length=8 --enable-digest=sha1 |
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.Ve |
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.PP |
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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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1.2 |
with 8 bytes of random data. In the long run, people should move to |
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\&\s-1SHA\-224\s0 and beyond, but support in openssl is missing as of writing this |
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document. |
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pcg |
1.1 |
.PP |
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In general, remember that \s-1AES\-128\s0 seems to be more secure and faster than |
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\&\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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.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/gvpe\*(C'\fR, depending on how you |
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configured gvpe, 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/gvpe/gvpe.conf\*(C'\fR: |
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.PP |
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.Vb 3 |
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\& 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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.Ve |
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.PP |
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.Vb 2 |
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\& 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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.Ve |
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.PP |
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.Vb 2 |
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\& node = second |
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\& hostname = 133.55.82.9 |
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.Ve |
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.PP |
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.Vb 2 |
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\& node = third |
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\& hostname = third.example.net |
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.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/gvpe/if\-up\*(C'\fR |
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and make it execute (\f(CW\*(C`chmod 755 /etc/gvpe/if\-up\*(C'\fR): |
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.PP |
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.Vb 6 |
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\& #!/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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.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`gvpe\*(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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\& gvpectrl -c /etc/gvpe -g |
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.Ve |
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.PP |
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This command will put the public keys into \f(CW\*(C`/etc/gvpe/pubkeys/\f(CInodename\f(CW\*(C'\fR and the private keys into \f(CW\*(C`/etc/gvpe/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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\& rsync -avzessh /etc/gvpe first.example.net:/etc/. --exclude hostkeys |
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\& rsync -avzessh /etc/gvpe 133.55.82.9:/etc/. --exclude hostkeys |
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\& rsync -avzessh /etc/gvpe third.example.net:/etc/. --exclude hostkeys |
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.Ve |
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.PP |
| 309 |
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Then the hostkeys should be copied: |
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.PP |
| 311 |
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.Vb 3 |
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\& rsync -avzessh /etc/gvpe/hostkeys/first first.example.net:/etc/hostkey |
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\& rsync -avzessh /etc/gvpe/hostkeys/second 133.55.82.9:/etc/hostkey |
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\& rsync -avzessh /etc/gvpe/hostkeys/third third.example.net:/etc/hostkey |
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.Ve |
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.PP |
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You should now check the configration by issuing the command \f(CW\*(C`gvpectrl \-c |
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/etc/gvpe \-s\*(C'\fR on each node and verify it's output. |
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.Sh "\s-1STEP\s0 4: starting gvpe" |
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.IX Subsection "STEP 4: starting gvpe" |
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You should then start gvpe on each node by issuing a command like: |
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.PP |
| 323 |
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.Vb 1 |
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\& gvpe -D -linfo first # first is the nodename |
| 325 |
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.Ve |
| 326 |
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.PP |
| 327 |
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This will make the gvpe stay in foreground. You should then see |
| 328 |
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\&\*(L"connection established\*(R" messages. If you don't see them check your |
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firewall and routing (use tcpdump ;). |
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.PP |
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If this works you should check your networking setup by pinging various |
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endpoints. |
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.PP |
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To make gvpe run more permanently you can either run it as a daemon |
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(by starting it without the \f(CW\*(C`\-D\*(C'\fR switch), or, much better, from your |
| 336 |
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inittab. I use a line like this on my systems: |
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.PP |
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.Vb 1 |
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\& t1:2345:respawn:/opt/gvpe/sbin/gvpe -D -L first >/dev/null 2>&1 |
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|
.Ve |
| 341 |
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.Sh "\s-1STEP\s0 5: enjoy" |
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.IX Subsection "STEP 5: enjoy" |
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\&... and play around. Sending a \-HUP (\f(CW\*(C`gvpectrl \-kHUP\*(C'\fR) to the daemon |
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will make it try to connect to all other nodes again. If you run it from |
| 345 |
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inittab, as is recommended, \f(CW\*(C`gvpectrl \-k\*(C'\fR (or simply \f(CW\*(C`killall gvpe\*(C'\fR) will |
| 346 |
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kill the daemon, start it again, making it read it's configuration files |
| 347 |
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again. |
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.SH "SEE ALSO" |
| 349 |
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.IX Header "SEE ALSO" |
| 350 |
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\&\fIgvpe.osdep\fR\|(5) for OS-depedendent information, \fIgvpe.conf\fR\|(5), \fIgvpectrl\fR\|(8), and |
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for a description of the protocol and routing algorithms, \fIgvpe.protocol\fR\|(7). |
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.SH "AUTHOR" |
| 353 |
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.IX Header "AUTHOR" |
| 354 |
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Marc Lehmann <gvpe@plan9.de> |
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.SH "COPYRIGHTS AND LICENSES" |
| 356 |
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.IX Header "COPYRIGHTS AND LICENSES" |
| 357 |
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\&\s-1GVPE\s0 itself is distributed under the \s-1GENERAL\s0 \s-1PUBLIC\s0 \s-1LICENSE\s0 (see the file |
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\&\s-1COPYING\s0 that should be part of your distribution). |
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|
.PP |
| 360 |
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|
In some configurations it uses modified versions of the tinc vpn suite, |
| 361 |
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which is also available under the \s-1GENERAL\s0 \s-1PUBLIC\s0 \s-1LICENSE\s0. |
