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| 37 | . ds -- \|\(em\| |
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| 38 | . ds PI \(*p |
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| 124 | .\" ======================================================================== |
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| 126 | .IX Title "GVPE 5" |
135 | .IX Title "GVPE 5" |
| 127 | .TH GVPE 5 "2013-07-10" "2.24" "GNU Virtual Private Ethernet" |
136 | .TH GVPE 5 "2015-10-31" "2.25" "GNU Virtual Private Ethernet" |
| 128 | .\" For nroff, turn off justification. Always turn off hyphenation; it makes |
137 | .\" For nroff, turn off justification. Always turn off hyphenation; it makes |
| 129 | .\" way too many mistakes in technical documents. |
138 | .\" way too many mistakes in technical documents. |
| 130 | .if n .ad l |
139 | .if n .ad l |
| 131 | .nh |
140 | .nh |
| 132 | .SH "NAME" |
141 | .SH "NAME" |
| 133 | GNU\-VPE \- Overview of the GNU Virtual Private Ethernet suite. |
142 | GNU\-VPE \- Overview of the GNU Virtual Private Ethernet suite. |
| 134 | .SH "DESCRIPTION" |
143 | .SH "DESCRIPTION" |
| 135 | .IX Header "DESCRIPTION" |
144 | .IX Header "DESCRIPTION" |
| 136 | \&\s-1GVPE\s0 is a suite designed to provide a virtual private network for multiple |
145 | \&\s-1GVPE\s0 is a suite designed to provide a virtual private network for multiple |
| 137 | nodes over an untrusted network. This document first gives an introduction |
146 | nodes over an untrusted network. This document first gives an introduction |
| 138 | to VPNs in general and then describes the specific implementation of \s-1GVPE\s0. |
147 | to VPNs in general and then describes the specific implementation of \s-1GVPE.\s0 |
| 139 | .SS "\s-1WHAT\s0 \s-1IS\s0 A \s-1VPN\s0?" |
148 | .SS "\s-1WHAT IS A VPN\s0?" |
| 140 | .IX Subsection "WHAT IS A VPN?" |
149 | .IX Subsection "WHAT IS A VPN?" |
| 141 | \&\s-1VPN\s0 is an acronym, it stands for: |
150 | \&\s-1VPN\s0 is an acronym, it stands for: |
| 142 | .IP "Virtual" 4 |
151 | .IP "Virtual" 4 |
| 143 | .IX Item "Virtual" |
152 | .IX Item "Virtual" |
| 144 | Virtual means that no physical network is created (of course), but a |
153 | Virtual means that no physical network is created (of course), but a |
| … | |
… | |
| 154 | inject (\*(L"spoof\*(R") packets. This means that nodes can be connected over |
163 | inject (\*(L"spoof\*(R") packets. This means that nodes can be connected over |
| 155 | untrusted networks such as the public Internet without fear of being |
164 | untrusted networks such as the public Internet without fear of being |
| 156 | eavesdropped while at the same time being able to trust data sent by other |
165 | eavesdropped while at the same time being able to trust data sent by other |
| 157 | nodes. |
166 | nodes. |
| 158 | .Sp |
167 | .Sp |
| 159 | In the case of \s-1GVPE\s0, even participating nodes cannot sniff packets |
168 | In the case of \s-1GVPE,\s0 even participating nodes cannot sniff packets |
| 160 | send to other nodes or spoof packets as if sent from other nodes, so |
169 | send to other nodes or spoof packets as if sent from other nodes, so |
| 161 | communications between any two nodes is private to those two nodes. |
170 | communications between any two nodes is private to those two nodes. |
| 162 | .IP "Network" 4 |
171 | .IP "Network" 4 |
| 163 | .IX Item "Network" |
172 | .IX Item "Network" |
| 164 | Network means that more than two parties can participate in the network, |
173 | Network means that more than two parties can participate in the network, |
| 165 | so for instance it's possible to connect multiple branches of a company |
174 | so for instance it's possible to connect multiple branches of a company |
| 166 | into a single network. Many so-called \*(L"\s-1VPN\s0\*(R" solutions only create |
175 | into a single network. Many so-called \*(L"\s-1VPN\*(R"\s0 solutions only create |
| 167 | point-to-point tunnels, which in turn can be used to build larger |
176 | point-to-point tunnels, which in turn can be used to build larger |
| 168 | networks. |
177 | networks. |
| 169 | .Sp |
178 | .Sp |
| 170 | \&\s-1GVPE\s0 provides a true multi-point network in which any number of nodes (at |
179 | \&\s-1GVPE\s0 provides a true multi-point network in which any number of nodes (at |
| 171 | least a few dozen in practise, the theoretical limit is 4095 nodes) can |
180 | least a few dozen in practise, the theoretical limit is 4095 nodes) can |
| 172 | participate. |
181 | participate. |
| 173 | .SS "\s-1GVPE\s0 \s-1DESIGN\s0 \s-1GOALS\s0" |
182 | .SS "\s-1GVPE DESIGN GOALS\s0" |
| 174 | .IX Subsection "GVPE DESIGN GOALS" |
183 | .IX Subsection "GVPE DESIGN GOALS" |
| 175 | .IP "\s-1SIMPLE\s0 \s-1DESIGN\s0" 4 |
184 | .IP "\s-1SIMPLE DESIGN\s0" 4 |
| 176 | .IX Item "SIMPLE DESIGN" |
185 | .IX Item "SIMPLE DESIGN" |
| 177 | Cipher, \s-1HMAC\s0 algorithms and other key parameters must be selected |
186 | Cipher, \s-1HMAC\s0 algorithms and other key parameters must be selected |
| 178 | at compile time \- this makes it possible to only link in algorithms |
187 | at compile time \- this makes it possible to only link in algorithms |
| 179 | you actually need. It also makes the crypto part of the source very |
188 | you actually need. It also makes the crypto part of the source very |
| 180 | transparent and easy to inspect, and last not least this makes it possible |
189 | transparent and easy to inspect, and last not least this makes it possible |
| 181 | to hardcode the layout of all packets into the binary. \s-1GVPE\s0 goes a step |
190 | to hardcode the layout of all packets into the binary. \s-1GVPE\s0 goes a step |
| 182 | further and internally reserves blocks of the same length for all packets, |
191 | further and internally reserves blocks of the same length for all packets, |
| 183 | which virtually removes all possibilities of buffer overflows, as there is |
192 | which virtually removes all possibilities of buffer overflows, as there is |
| 184 | only a single type of buffer and it's always of fixed length. |
193 | only a single type of buffer and it's always of fixed length. |
| 185 | .IP "\s-1EASY\s0 \s-1TO\s0 \s-1SETUP\s0" 4 |
194 | .IP "\s-1EASY TO SETUP\s0" 4 |
| 186 | .IX Item "EASY TO SETUP" |
195 | .IX Item "EASY TO SETUP" |
| 187 | A few lines of config (the config file is shared unmodified between all |
196 | A few lines of config (the config file is shared unmodified between all |
| 188 | hosts) and a single run of \f(CW\*(C`gvpectrl\*(C'\fR to generate the keys suffices to |
197 | hosts) and a single run of \f(CW\*(C`gvpectrl\*(C'\fR to generate the keys suffices to |
| 189 | make it work. |
198 | make it work. |
| 190 | .IP "MAC-BASED \s-1SECURITY\s0" 4 |
199 | .IP "MAC-BASED \s-1SECURITY\s0" 4 |
| … | |
… | |
| 216 | impossible under most circumstances. |
225 | impossible under most circumstances. |
| 217 | .PP |
226 | .PP |
| 218 | Here are a few recipes for compiling your gvpe, showing the extremes |
227 | Here are a few recipes for compiling your gvpe, showing the extremes |
| 219 | (fast, small, insecure \s-1OR\s0 slow, large, more secure), between which you |
228 | (fast, small, insecure \s-1OR\s0 slow, large, more secure), between which you |
| 220 | should choose: |
229 | should choose: |
| 221 | .SS "\s-1AS\s0 \s-1LOW\s0 \s-1PACKET\s0 \s-1OVERHEAD\s0 \s-1AS\s0 \s-1POSSIBLE\s0" |
230 | .SS "\s-1AS LOW PACKET OVERHEAD AS POSSIBLE\s0" |
| 222 | .IX Subsection "AS LOW PACKET OVERHEAD AS POSSIBLE" |
231 | .IX Subsection "AS LOW PACKET OVERHEAD AS POSSIBLE" |
| 223 | .Vb 1 |
232 | .Vb 1 |
| 224 | \& ./configure \-\-enable\-hmac\-length=4 \-\-enable\-rand\-length=0 |
233 | \& ./configure \-\-enable\-hmac\-length=4 \-\-enable\-rand\-length=0 |
| 225 | .Ve |
234 | .Ve |
| 226 | .PP |
235 | .PP |
| 227 | Minimize the header overhead of \s-1VPN\s0 packets (the above will result in |
236 | Minimize the header overhead of \s-1VPN\s0 packets (the above will result in |
| 228 | only 4 bytes of overhead over the raw ethernet frame). This is a insecure |
237 | only 4 bytes of overhead over the raw ethernet frame). This is a insecure |
| 229 | configuration because a \s-1HMAC\s0 length of 4 makes collision attacks almost |
238 | configuration because a \s-1HMAC\s0 length of 4 makes collision attacks almost |
| 230 | trivial. |
239 | trivial. |
| 231 | .SS "\s-1MINIMIZE\s0 \s-1CPU\s0 \s-1TIME\s0 \s-1REQUIRED\s0" |
240 | .SS "\s-1MINIMIZE CPU TIME REQUIRED\s0" |
| 232 | .IX Subsection "MINIMIZE CPU TIME REQUIRED" |
241 | .IX Subsection "MINIMIZE CPU TIME REQUIRED" |
| 233 | .Vb 1 |
242 | .Vb 1 |
| 234 | \& ./configure \-\-enable\-cipher=bf \-\-enable\-digest=md4 |
243 | \& ./configure \-\-enable\-cipher=bf \-\-enable\-digest=md4 |
| 235 | .Ve |
244 | .Ve |
| 236 | .PP |
245 | .PP |
| 237 | Use the fastest cipher and digest algorithms currently available in |
246 | Use the fastest cipher and digest algorithms currently available in |
| 238 | gvpe. \s-1MD4\s0 has been broken and is quite insecure, though, so using another |
247 | gvpe. \s-1MD4\s0 has been broken and is quite insecure, though, so using another |
| 239 | digest algorithm is recommended. |
248 | digest algorithm is recommended. |
| 240 | .SS "\s-1MAXIMIZE\s0 \s-1SECURITY\s0" |
249 | .SS "\s-1MAXIMIZE SECURITY\s0" |
| 241 | .IX Subsection "MAXIMIZE SECURITY" |
250 | .IX Subsection "MAXIMIZE SECURITY" |
| 242 | .Vb 1 |
251 | .Vb 1 |
| 243 | \& ./configure \-\-enable\-hmac\-length=16 \-\-enable\-rand\-length=12 \-\-enable\-digest=ripemd610 |
252 | \& ./configure \-\-enable\-hmac\-length=16 \-\-enable\-rand\-length=12 \-\-enable\-digest=ripemd610 |
| 244 | .Ve |
253 | .Ve |
| 245 | .PP |
254 | .PP |
| 246 | This uses a 16 byte \s-1HMAC\s0 checksum to authenticate packets (I guess 8\-12 |
255 | This uses a 16 byte \s-1HMAC\s0 checksum to authenticate packets (I guess 8\-12 |
| 247 | would also be pretty secure ;) and will additionally prefix each packet |
256 | would also be pretty secure ;) and will additionally prefix each packet |
| 248 | with 12 bytes of random data. |
257 | with 12 bytes of random data. |
| 249 | .PP |
258 | .PP |
| 250 | In general, remember that \s-1AES\-128\s0 seems to be as secure but faster than |
259 | In general, remember that \s-1AES\-128\s0 seems to be as secure but faster than |
| 251 | \&\s-1AES\-192\s0 or \s-1AES\-256\s0, more randomness helps against sniffing and a longer |
260 | \&\s-1AES\-192\s0 or \s-1AES\-256,\s0 more randomness helps against sniffing and a longer |
| 252 | \&\s-1HMAC\s0 helps against spoofing. \s-1MD4\s0 is a fast digest, \s-1SHA1\s0, \s-1RIPEMD160\s0, \s-1SHA256\s0 |
261 | \&\s-1HMAC\s0 helps against spoofing. \s-1MD4\s0 is a fast digest, \s-1SHA1, RIPEMD160, SHA256\s0 |
| 253 | are consecutively better, and Blowfish is a fast cipher (and also quite |
262 | are consecutively better, and Blowfish is a fast cipher (and also quite |
| 254 | secure). |
263 | secure). |
| 255 | .SH "HOW TO SET UP A SIMPLE VPN" |
264 | .SH "HOW TO SET UP A SIMPLE VPN" |
| 256 | .IX Header "HOW TO SET UP A SIMPLE VPN" |
265 | .IX Header "HOW TO SET UP A SIMPLE VPN" |
| 257 | In this section I will describe how to get a simple \s-1VPN\s0 consisting of |
266 | In this section I will describe how to get a simple \s-1VPN\s0 consisting of |
| 258 | three hosts up and running. |
267 | three hosts up and running. |
| 259 | .SS "\s-1STEP\s0 1: configuration" |
268 | .SS "\s-1STEP 1:\s0 configuration" |
| 260 | .IX Subsection "STEP 1: configuration" |
269 | .IX Subsection "STEP 1: configuration" |
| 261 | First you have to create a daemon configuration file and put it into the |
270 | First you have to create a daemon configuration file and put it into the |
| 262 | configuration directory. This is usually \f(CW\*(C`/etc/gvpe\*(C'\fR, depending on how you |
271 | configuration directory. This is usually \f(CW\*(C`/etc/gvpe\*(C'\fR, depending on how you |
| 263 | configured gvpe, and can be overwritten using the \f(CW\*(C`\-c\*(C'\fR command line switch. |
272 | configured gvpe, and can be overwritten using the \f(CW\*(C`\-c\*(C'\fR command line switch. |
| 264 | .PP |
273 | .PP |
| … | |
… | |
| 299 | .PP |
308 | .PP |
| 300 | By enabling routing on the gateway host that runs \f(CW\*(C`gvpe\*(C'\fR all nodes will |
309 | By enabling routing on the gateway host that runs \f(CW\*(C`gvpe\*(C'\fR all nodes will |
| 301 | be able to reach the other nodes. You can, of course, also use proxy \s-1ARP\s0 |
310 | be able to reach the other nodes. You can, of course, also use proxy \s-1ARP\s0 |
| 302 | or other means of pseudo-bridging, or (best) full routing \- the choice is |
311 | or other means of pseudo-bridging, or (best) full routing \- the choice is |
| 303 | yours. |
312 | yours. |
| 304 | .SS "\s-1STEP\s0 2: create the \s-1RSA\s0 key pairs for all hosts" |
313 | .SS "\s-1STEP 2:\s0 create the \s-1RSA\s0 key pairs for all hosts" |
| 305 | .IX Subsection "STEP 2: create the RSA key pairs for all hosts" |
314 | .IX Subsection "STEP 2: create the RSA key pairs for all hosts" |
| 306 | Run the following command to generate all key pairs for all nodes (that |
315 | Run the following command to generate all key pairs for all nodes (that |
| 307 | might take a while): |
316 | might take a while): |
| 308 | .PP |
317 | .PP |
| 309 | .Vb 1 |
318 | .Vb 1 |
| 310 | \& gvpectrl \-c /etc/gvpe \-g |
319 | \& gvpectrl \-c /etc/gvpe \-g |
| 311 | .Ve |
320 | .Ve |
| 312 | .PP |
321 | .PP |
| 313 | 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. |
322 | 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. |
| 314 | .SS "\s-1STEP\s0 3: distribute the config files to all nodes" |
323 | .SS "\s-1STEP 3:\s0 distribute the config files to all nodes" |
| 315 | .IX Subsection "STEP 3: distribute the config files to all nodes" |
324 | .IX Subsection "STEP 3: distribute the config files to all nodes" |
| 316 | Now distribute the config files and private keys to the other nodes. This |
325 | Now distribute the config files and private keys to the other nodes. This |
| 317 | should be done in two steps, since only the private keys meant for a node |
326 | should be done in two steps, since only the private keys meant for a node |
| 318 | should be distributed (so each node has only it's own private key). |
327 | should be distributed (so each node has only it's own private key). |
| 319 | .PP |
328 | .PP |
| … | |
… | |
| 335 | \& rsync \-avzessh /etc/gvpe/hostkeys/third third.example.net:/etc/hostkey |
344 | \& rsync \-avzessh /etc/gvpe/hostkeys/third third.example.net:/etc/hostkey |
| 336 | .Ve |
345 | .Ve |
| 337 | .PP |
346 | .PP |
| 338 | You should now check the configuration by issuing the command \f(CW\*(C`gvpectrl \-c |
347 | You should now check the configuration by issuing the command \f(CW\*(C`gvpectrl \-c |
| 339 | /etc/gvpe \-s\*(C'\fR on each node and verify it's output. |
348 | /etc/gvpe \-s\*(C'\fR on each node and verify it's output. |
| 340 | .SS "\s-1STEP\s0 4: starting gvpe" |
349 | .SS "\s-1STEP 4:\s0 starting gvpe" |
| 341 | .IX Subsection "STEP 4: starting gvpe" |
350 | .IX Subsection "STEP 4: starting gvpe" |
| 342 | You should then start gvpe on each node by issuing a command like: |
351 | You should then start gvpe on each node by issuing a command like: |
| 343 | .PP |
352 | .PP |
| 344 | .Vb 1 |
353 | .Vb 1 |
| 345 | \& gvpe \-D \-l info first # first is the nodename |
354 | \& gvpe \-D \-l info first # first is the nodename |
| … | |
… | |
| 357 | or equivalent. I use a line like this on all my systems: |
366 | or equivalent. I use a line like this on all my systems: |
| 358 | .PP |
367 | .PP |
| 359 | .Vb 1 |
368 | .Vb 1 |
| 360 | \& t1:2345:respawn:/opt/gvpe/sbin/gvpe \-D \-L first >/dev/null 2>&1 |
369 | \& t1:2345:respawn:/opt/gvpe/sbin/gvpe \-D \-L first >/dev/null 2>&1 |
| 361 | .Ve |
370 | .Ve |
| 362 | .SS "\s-1STEP\s0 5: enjoy" |
371 | .SS "\s-1STEP 5:\s0 enjoy" |
| 363 | .IX Subsection "STEP 5: enjoy" |
372 | .IX Subsection "STEP 5: enjoy" |
| 364 | \&... and play around. Sending a \-HUP (\f(CW\*(C`gvpectrl \-kHUP\*(C'\fR) to the daemon |
373 | \&... and play around. Sending a \-HUP (\f(CW\*(C`gvpectrl \-kHUP\*(C'\fR) to the daemon |
| 365 | will make it try to connect to all other nodes again. If you run it from |
374 | will make it try to connect to all other nodes again. If you run it from |
| 366 | inittab, as is recommended, \f(CW\*(C`gvpectrl \-k\*(C'\fR (or simply \f(CW\*(C`killall gvpe\*(C'\fR) will |
375 | inittab, as is recommended, \f(CW\*(C`gvpectrl \-k\*(C'\fR (or simply \f(CW\*(C`killall gvpe\*(C'\fR) will |
| 367 | kill the daemon, start it again, making it read it's configuration files |
376 | kill the daemon, start it again, making it read it's configuration files |
| … | |
… | |
| 377 | .SH "AUTHOR" |
386 | .SH "AUTHOR" |
| 378 | .IX Header "AUTHOR" |
387 | .IX Header "AUTHOR" |
| 379 | Marc Lehmann <gvpe@schmorp.de> |
388 | Marc Lehmann <gvpe@schmorp.de> |
| 380 | .SH "COPYRIGHTS AND LICENSES" |
389 | .SH "COPYRIGHTS AND LICENSES" |
| 381 | .IX Header "COPYRIGHTS AND LICENSES" |
390 | .IX Header "COPYRIGHTS AND LICENSES" |
| 382 | \&\s-1GVPE\s0 itself is distributed under the \s-1GENERAL\s0 \s-1PUBLIC\s0 \s-1LICENSE\s0 (see the file |
391 | \&\s-1GVPE\s0 itself is distributed under the \s-1GENERAL PUBLIC LICENSE \s0(see the file |
| 383 | \&\s-1COPYING\s0 that should be part of your distribution). |
392 | \&\s-1COPYING\s0 that should be part of your distribution). |
| 384 | .PP |
393 | .PP |
| 385 | In some configurations it uses modified versions of the tinc vpn suite, |
394 | In some configurations it uses modified versions of the tinc vpn suite, |
| 386 | which is also available under the \s-1GENERAL\s0 \s-1PUBLIC\s0 \s-1LICENSE\s0. |
395 | which is also available under the \s-1GENERAL PUBLIC LICENSE.\s0 |
