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Revision: 1.52
Committed: Tue Feb 8 23:11:35 2011 UTC (13 years, 3 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.51: +14 -8 lines
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File Contents

# Content
1 /*
2 conf.c -- configuration code
3 Copyright (C) 2003-2008 Marc Lehmann <gvpe@schmorp.de>
4
5 This file is part of GVPE.
6
7 GVPE is free software; you can redistribute it and/or modify it
8 under the terms of the GNU General Public License as published by the
9 Free Software Foundation; either version 3 of the License, or (at your
10 option) any later version.
11
12 This program is distributed in the hope that it will be useful, but
13 WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
15 Public License for more details.
16
17 You should have received a copy of the GNU General Public License along
18 with this program; if not, see <http://www.gnu.org/licenses/>.
19
20 Additional permission under GNU GPL version 3 section 7
21
22 If you modify this Program, or any covered work, by linking or
23 combining it with the OpenSSL project's OpenSSL library (or a modified
24 version of that library), containing parts covered by the terms of the
25 OpenSSL or SSLeay licenses, the licensors of this Program grant you
26 additional permission to convey the resulting work. Corresponding
27 Source for a non-source form of such a combination shall include the
28 source code for the parts of OpenSSL used as well as that of the
29 covered work.
30 */
31
32 #include "config.h"
33
34 #include <cstdio>
35 #include <cstdlib>
36 #include <cstring>
37
38 #include <errno.h>
39 #include <netdb.h>
40 #include <sys/stat.h>
41 #include <sys/types.h>
42 #include <unistd.h>
43
44 #include "netcompat.h"
45
46 #include <openssl/err.h>
47 #include <openssl/pem.h>
48 #include <openssl/rsa.h>
49 #include <openssl/rand.h>
50 #include <openssl/bn.h>
51
52 #include "conf.h"
53 #include "slog.h"
54 #include "util.h"
55
56 char *confbase;
57 char *thisnode;
58 char *identname;
59
60 struct configuration conf;
61
62 u8
63 best_protocol (u8 protset)
64 {
65 if (protset & PROT_IPv4 ) return PROT_IPv4;
66 if (protset & PROT_ICMPv4) return PROT_ICMPv4;
67 if (protset & PROT_UDPv4 ) return PROT_UDPv4;
68 if (protset & PROT_TCPv4 ) return PROT_TCPv4;
69 if (protset & PROT_DNSv4 ) return PROT_DNSv4;
70
71 return 0;
72 }
73
74 const char *
75 strprotocol (u8 protocol)
76 {
77 if (protocol & PROT_IPv4 ) return "rawip";
78 if (protocol & PROT_ICMPv4) return "icmp";
79 if (protocol & PROT_UDPv4 ) return "udp";
80 if (protocol & PROT_TCPv4 ) return "tcp";
81 if (protocol & PROT_DNSv4 ) return "dns";
82
83 return "<unknown>";
84 }
85
86 static bool
87 match_list (const vector<const char *> &list, const char *str)
88 {
89 for (vector<const char *>::const_iterator i = list.end (); i-- > list.begin (); )
90 if ((*i)[0] == '*' && !(*i)[1])
91 return true;
92 else if (!strcmp (*i, str))
93 return true;
94
95 return false;
96 }
97
98 bool
99 conf_node::may_direct (struct conf_node *other)
100 {
101 if (match_list (allow_direct, other->nodename))
102 return true;
103
104 if (match_list (deny_direct, other->nodename))
105 return false;
106
107 return true;
108 }
109
110 void
111 conf_node::print ()
112 {
113 printf ("%4d fe:fd:80:00:0%1x:%02x %c %-8.8s %-10.10s %s%s%d\n",
114 id,
115 id >> 8, id & 0xff,
116 compress ? 'Y' : 'N',
117 connectmode == C_ONDEMAND ? "ondemand"
118 : connectmode == C_NEVER ? "never"
119 : connectmode == C_ALWAYS ? "always"
120 : connectmode == C_DISABLED ? "disabled"
121 : "",
122 nodename,
123 hostname ? hostname : "",
124 hostname ? ":" : "",
125 hostname ? udp_port : 0
126 );
127 }
128
129 conf_node::~conf_node ()
130 {
131 #if 0
132 // does not work, because string pointers etc. are shared
133 // is not called, however
134 if (rsa_key)
135 RSA_free (rsa_key);
136
137 free (nodename);
138 free (hostname);
139 free (if_up_data);
140 #if ENABLE_DNS
141 free (domain);
142 free (dns_hostname);
143 #endif
144 #endif
145 }
146
147 void
148 configuration::init ()
149 {
150 memset (this, 0, sizeof (*this));
151
152 mtu = DEFAULT_MTU;
153 nfmark = 0;
154 rekey = DEFAULT_REKEY;
155 keepalive = DEFAULT_KEEPALIVE;
156 llevel = L_INFO;
157 ip_proto = IPPROTO_GRE;
158 #if ENABLE_ICMP
159 icmp_type = ICMP_ECHOREPLY;
160 #endif
161
162 default_node.udp_port = DEFAULT_UDPPORT;
163 default_node.tcp_port = DEFAULT_UDPPORT; // ehrm
164 default_node.connectmode = conf_node::C_ALWAYS;
165 default_node.compress = true;
166 default_node.protocols = 0;
167 default_node.max_retry = DEFAULT_MAX_RETRY;
168 default_node.max_ttl = DEFAULT_MAX_TTL;
169 default_node.max_queue = DEFAULT_MAX_QUEUE;
170 default_node.if_up_data = strdup ("");
171
172 #if ENABLE_DNS
173 default_node.dns_port = 0; // default is 0 == client
174
175 dns_forw_host = strdup ("127.0.0.1");
176 dns_forw_port = 53;
177 dns_timeout_factor = DEFAULT_DNS_TIMEOUT_FACTOR;
178 dns_send_interval = DEFAULT_DNS_SEND_INTERVAL;
179 dns_overlap_factor = DEFAULT_DNS_OVERLAP_FACTOR;
180 dns_max_outstanding = DEFAULT_DNS_MAX_OUTSTANDING;
181 #endif
182
183 conf.pidfilename = strdup (LOCALSTATEDIR "/run/gvpe.pid");
184 }
185
186 void
187 configuration::cleanup ()
188 {
189 if (rsa_key)
190 RSA_free (rsa_key);
191
192 rsa_key = 0;
193
194 free (pidfilename); pidfilename = 0;
195 free (ifname); ifname = 0;
196 #if ENABLE_HTTP_PROXY
197 free (proxy_host); proxy_host = 0;
198 free (proxy_auth); proxy_auth = 0;
199 #endif
200 #if ENABLE_DNS
201 free (dns_forw_host); dns_forw_host = 0;
202 #endif
203 free (script_if_up); script_if_up = 0;
204 free (script_node_up); script_node_up = 0;
205 free (script_node_change); script_node_change = 0;
206 free (script_node_down); script_node_down = 0;
207 }
208
209 void
210 configuration::clear ()
211 {
212 for (configuration::node_vector::iterator i = nodes.begin(); i != nodes.end(); ++i)
213 delete *i;
214
215 nodes.clear ();
216
217 cleanup ();
218 init ();
219 }
220
221 #define parse_bool(target,name,trueval,falseval) do { \
222 if (!strcmp (val, "yes")) target = trueval; \
223 else if (!strcmp (val, "no")) target = falseval; \
224 else if (!strcmp (val, "true")) target = trueval; \
225 else if (!strcmp (val, "false")) target = falseval; \
226 else if (!strcmp (val, "on")) target = trueval; \
227 else if (!strcmp (val, "off")) target = falseval; \
228 else \
229 return _("illegal boolean value, only 'yes|true|on' or 'no|false|off' allowed. (ignored)"); \
230 } while (0)
231
232 const char *
233 configuration_parser::parse_line (char *line)
234 {
235 {
236 char *end = line + strlen (line);
237
238 while (*end < ' ' && end >= line)
239 end--;
240
241 *++end = 0;
242 }
243
244 char *tok = line;
245 const char *var = strtok (tok, "\t =");
246 tok = 0;
247
248 if (!var || !var[0])
249 return 0; /* no tokens on this line */
250
251 if (var[0] == '#')
252 return 0; /* comment: ignore */
253
254 char *val = strtok (NULL, "\t\n\r =");
255
256 if (!val || val[0] == '#')
257 return _("no value given for variable. (ignored)");
258
259 if (!strcmp (var, "on"))
260 {
261 if (!::thisnode
262 || (val[0] == '!' && strcmp (val + 1, ::thisnode))
263 || !strcmp (val, ::thisnode))
264 return parse_line (strtok (NULL, "\n\r"));
265 else
266 return 0;
267 }
268
269 // truly global
270 if (!strcmp (var, "loglevel"))
271 {
272 loglevel l = string_to_loglevel (val);
273
274 if (l == L_NONE)
275 return _("unknown loglevel. (skipping)");
276 }
277 else if (!strcmp (var, "ip-proto"))
278 conf.ip_proto = atoi (val);
279 else if (!strcmp (var, "icmp-type"))
280 {
281 #if ENABLE_ICMP
282 conf.icmp_type = atoi (val);
283 #endif
284 }
285
286 // per config
287 else if (!strcmp (var, "node"))
288 {
289 parse_argv ();
290
291 conf.default_node.id++;
292 node = new conf_node (conf.default_node);
293 conf.nodes.push_back (node);
294 node->nodename = strdup (val);
295
296 {
297 char *fname;
298 FILE *f;
299
300 asprintf (&fname, "%s/pubkey/%s", confbase, node->nodename);
301
302 f = fopen (fname, "r");
303 if (f)
304 {
305 node->rsa_key = RSA_new ();
306
307 if (!PEM_read_RSAPublicKey(f, &node->rsa_key, NULL, NULL))
308 {
309 ERR_load_RSA_strings (); ERR_load_PEM_strings ();
310 slog (L_ERR, _("unable to open public rsa key file '%s': %s"), fname, ERR_error_string (ERR_get_error (), 0));
311 exit (EXIT_FAILURE);
312 }
313
314 require (RSA_blinding_on (node->rsa_key, 0));
315
316 fclose (f);
317 }
318 else
319 {
320 slog (need_keys ? L_ERR : L_NOTICE, _("unable to read public rsa key file '%s': %s"), fname, strerror (errno));
321
322 if (need_keys)
323 exit (EXIT_FAILURE);
324 }
325
326 free (fname);
327 }
328
329 if (::thisnode && !strcmp (node->nodename, ::thisnode))
330 conf.thisnode = node;
331 }
332 else if (!strcmp (var, "private-key"))
333 free (conf.prikeyfile), conf.prikeyfile = strdup (val);
334 else if (!strcmp (var, "ifpersist"))
335 parse_bool (conf.ifpersist, "ifpersist", true, false);
336 else if (!strcmp (var, "ifname"))
337 free (conf.ifname), conf.ifname = strdup (val);
338 else if (!strcmp (var, "rekey"))
339 conf.rekey = atoi (val);
340 else if (!strcmp (var, "keepalive"))
341 conf.keepalive = atoi (val);
342 else if (!strcmp (var, "mtu"))
343 conf.mtu = atoi (val);
344 else if (!strcmp (var, "nfmark"))
345 conf.nfmark = atoi (val);
346 else if (!strcmp (var, "if-up"))
347 free (conf.script_if_up), conf.script_if_up = strdup (val);
348 else if (!strcmp (var, "node-up"))
349 free (conf.script_node_up), conf.script_node_up = strdup (val);
350 else if (!strcmp (var, "node-change"))
351 free (conf.script_node_change), conf.script_node_change = strdup (val);
352 else if (!strcmp (var, "node-down"))
353 free (conf.script_node_down), conf.script_node_down = strdup (val);
354 else if (!strcmp (var, "pid-file"))
355 free (conf.pidfilename), conf.pidfilename = strdup (val);
356 else if (!strcmp (var, "dns-forw-host"))
357 {
358 #if ENABLE_DNS
359 free (conf.dns_forw_host), conf.dns_forw_host = strdup (val);
360 #endif
361 }
362 else if (!strcmp (var, "dns-forw-port"))
363 {
364 #if ENABLE_DNS
365 conf.dns_forw_port = atoi (val);
366 #endif
367 }
368 else if (!strcmp (var, "dns-timeout-factor"))
369 {
370 #if ENABLE_DNS
371 conf.dns_timeout_factor = atof (val);
372 #endif
373 }
374 else if (!strcmp (var, "dns-send-interval"))
375 {
376 #if ENABLE_DNS
377 conf.dns_send_interval = atoi (val);
378 #endif
379 }
380 else if (!strcmp (var, "dns-overlap-factor"))
381 {
382 #if ENABLE_DNS
383 conf.dns_overlap_factor = atof (val);
384 #endif
385 }
386 else if (!strcmp (var, "dns-max-outstanding"))
387 {
388 #if ENABLE_DNS
389 conf.dns_max_outstanding = atoi (val);
390 #endif
391 }
392 else if (!strcmp (var, "http-proxy-host"))
393 {
394 #if ENABLE_HTTP_PROXY
395 free (conf.proxy_host), conf.proxy_host = strdup (val);
396 #endif
397 }
398 else if (!strcmp (var, "http-proxy-port"))
399 {
400 #if ENABLE_HTTP_PROXY
401 conf.proxy_port = atoi (val);
402 #endif
403 }
404 else if (!strcmp (var, "http-proxy-auth"))
405 {
406 #if ENABLE_HTTP_PROXY
407 conf.proxy_auth = (char *)base64_encode ((const u8 *)val, strlen (val));
408 #endif
409 }
410
411 /* node-specific, non-defaultable */
412 else if (node != &conf.default_node && !strcmp (var, "hostname"))
413 free (node->hostname), node->hostname = strdup (val);
414
415 /* node-specific, defaultable */
416 else if (!strcmp (var, "udp-port"))
417 node->udp_port = atoi (val);
418 else if (!strcmp (var, "tcp-port"))
419 node->tcp_port = atoi (val);
420 else if (!strcmp (var, "dns-hostname"))
421 {
422 #if ENABLE_DNS
423 free (node->dns_hostname), node->dns_hostname = strdup (val);
424 #endif
425 }
426 else if (!strcmp (var, "dns-port"))
427 {
428 #if ENABLE_DNS
429 node->dns_port = atoi (val);
430 #endif
431 }
432 else if (!strcmp (var, "dns-domain"))
433 {
434 #if ENABLE_DNS
435 free (node->domain), node->domain = strdup (val);
436 #endif
437 }
438 else if (!strcmp (var, "if-up-data"))
439 free (node->if_up_data), node->if_up_data = strdup (val);
440 else if (!strcmp (var, "router-priority"))
441 node->routerprio = atoi (val);
442 else if (!strcmp (var, "max-retry"))
443 node->max_retry = atoi (val);
444 else if (!strcmp (var, "connect"))
445 {
446 if (!strcmp (val, "ondemand"))
447 node->connectmode = conf_node::C_ONDEMAND;
448 else if (!strcmp (val, "never"))
449 node->connectmode = conf_node::C_NEVER;
450 else if (!strcmp (val, "always"))
451 node->connectmode = conf_node::C_ALWAYS;
452 else if (!strcmp (val, "disabled"))
453 node->connectmode = conf_node::C_DISABLED;
454 else
455 return _("illegal value for 'connectmode', use one of 'ondemand', 'never', 'always' or 'disabled'. (ignored)");
456 }
457 else if (!strcmp (var, "inherit-tos"))
458 parse_bool (node->inherit_tos, "inherit-tos", true, false);
459 else if (!strcmp (var, "compress"))
460 parse_bool (node->compress, "compress", true, false);
461 // all these bool options really really cost a lot of executable size!
462 else if (!strcmp (var, "enable-tcp"))
463 {
464 #if ENABLE_TCP
465 u8 v; parse_bool (v, "enable-tcp" , PROT_TCPv4, 0); node->protocols = (node->protocols & ~PROT_TCPv4) | v;
466 #endif
467 }
468 else if (!strcmp (var, "enable-icmp"))
469 {
470 #if ENABLE_ICMP
471 u8 v; parse_bool (v, "enable-icmp" , PROT_ICMPv4, 0); node->protocols = (node->protocols & ~PROT_ICMPv4) | v;
472 #endif
473 }
474 else if (!strcmp (var, "enable-dns"))
475 {
476 #if ENABLE_DNS
477 u8 v; parse_bool (v, "enable-dns" , PROT_DNSv4, 0); node->protocols = (node->protocols & ~PROT_DNSv4) | v;
478 #endif
479 }
480 else if (!strcmp (var, "enable-udp"))
481 {
482 u8 v; parse_bool (v, "enable-udp" , PROT_UDPv4, 0); node->protocols = (node->protocols & ~PROT_UDPv4) | v;
483 }
484 else if (!strcmp (var, "enable-rawip"))
485 {
486 u8 v; parse_bool (v, "enable-rawip", PROT_IPv4, 0); node->protocols = (node->protocols & ~PROT_IPv4 ) | v;
487 }
488 else if (!strcmp (var, "allow-direct"))
489 node->allow_direct.push_back (strdup (val));
490 else if (!strcmp (var, "deny-direct"))
491 node->deny_direct.push_back (strdup (val));
492 else if (!strcmp (var, "max-ttl"))
493 node->max_ttl = atof (val);
494 else if (!strcmp (var, "max-queue"))
495 node->max_queue = atoi (val);
496
497 // unknown or misplaced
498 else
499 return _("unknown configuration directive. (ignored)");
500
501 return 0;
502 }
503
504 void
505 conf_node::finalise ()
506 {
507 if (max_queue < 1)
508 {
509 slog (L_WARN, _("%s: max-queue value invalid, setting it to 1."), nodename);
510 max_queue = 1;
511 }
512
513 if (routerprio > 1 && (connectmode != C_ALWAYS && connectmode != C_DISABLED))
514 {
515 //slog (L_WARN, _("%s: has non-zero router-priority but either 'never' or 'ondemand' as connectmode, setting it to 'always'."), nodename);
516 connectmode = C_ALWAYS;
517 }
518 }
519
520 void
521 configuration_parser::parse_argv ()
522 {
523 for (int i = 0; i < argc; ++i)
524 {
525 char *v = argv [i];
526
527 if (!*v)
528 continue;
529
530 char *enode = v;
531
532 while (*enode != '.' && *enode > ' ' && *enode != '=' && *enode)
533 enode++;
534
535 if (*enode != '.')
536 enode = 0;
537
538 char *wnode = node == &conf.default_node
539 ? 0
540 : node->nodename;
541
542 if ((!wnode && !enode)
543 || (wnode && enode && !strncmp (wnode, v, enode - v)))
544 {
545 const char *warn = parse_line (enode ? enode + 1 : v);
546
547 if (warn)
548 slog (L_WARN, _("%s, while parsing command line option '%s'."), warn, v);
549
550 *v = 0;
551 }
552 }
553 }
554
555 configuration_parser::configuration_parser (configuration &conf,
556 bool need_keys,
557 int argc,
558 char **argv)
559 : conf (conf),need_keys (need_keys), argc (argc), argv (argv)
560 {
561 char *fname;
562 FILE *f;
563
564 conf.clear ();
565
566 asprintf (&fname, "%s/gvpe.conf", confbase);
567 f = fopen (fname, "r");
568
569 if (f)
570 {
571 char line[16384];
572 int lineno = 0;
573 node = &conf.default_node;
574
575 while (fgets (line, sizeof (line), f))
576 {
577 lineno++;
578
579 const char *warn = parse_line (line);
580
581 if (warn)
582 slog (L_WARN, _("%s, at '%s', line %d."), warn, fname, lineno);
583 }
584
585 fclose (f);
586
587 parse_argv ();
588 }
589 else
590 {
591 slog (L_ERR, _("unable to read config file '%s': %s"), fname, strerror (errno));
592 exit (EXIT_FAILURE);
593 }
594
595 free (fname);
596
597 fname = conf.config_filename (conf.prikeyfile, "hostkey");
598
599 f = fopen (fname, "r");
600 if (f)
601 {
602 conf.rsa_key = RSA_new ();
603
604 if (!PEM_read_RSAPrivateKey (f, &conf.rsa_key, NULL, NULL))
605 {
606 ERR_load_RSA_strings (); ERR_load_PEM_strings ();
607 slog (L_ERR, _("unable to read private rsa key file '%s': %s"), fname, ERR_error_string (ERR_get_error (), 0));
608 exit (EXIT_FAILURE);
609 }
610
611 require (RSA_blinding_on (conf.rsa_key, 0));
612
613 fclose (f);
614 }
615 else
616 {
617 slog (need_keys ? L_ERR : L_NOTICE, _("unable to open private rsa key file '%s': %s"), fname, strerror (errno));
618
619 if (need_keys)
620 exit (EXIT_FAILURE);
621 }
622
623 if (need_keys && ::thisnode
624 && conf.rsa_key && conf.thisnode && conf.thisnode->rsa_key)
625 if (BN_cmp (conf.rsa_key->n, conf.thisnode->rsa_key->n) != 0
626 || BN_cmp (conf.rsa_key->e, conf.thisnode->rsa_key->e) != 0)
627 {
628 slog (L_NOTICE, _("private hostkey and public node key mismatch: is '%s' the correct node?"), ::thisnode);
629 exit (EXIT_FAILURE);
630 }
631
632 free (fname);
633
634 for (configuration::node_vector::iterator i = conf.nodes.begin(); i != conf.nodes.end(); ++i)
635 (*i)->finalise ();
636 }
637
638 char *
639 configuration::config_filename (const char *name, const char *dflt)
640 {
641 char *fname;
642
643 asprintf (&fname, name ? name : dflt, ::thisnode);
644
645 if (!ABSOLUTE_PATH (fname))
646 {
647 char *rname = fname;
648 asprintf (&fname, "%s/%s", confbase, rname);
649 free (rname);
650 }
651
652 return fname;
653 }
654
655 void
656 configuration::print ()
657 {
658 printf (_("\nConfiguration\n\n"));
659 printf (_("# of nodes: %d\n"), nodes.size ());
660 printf (_("this node: %s\n"), thisnode ? thisnode->nodename : "<unset>");
661 printf (_("MTU: %d\n"), mtu);
662 printf (_("rekeying interval: %d\n"), rekey);
663 printf (_("keepalive interval: %d\n"), keepalive);
664 printf (_("interface: %s\n"), ifname);
665 printf (_("primary rsa key: %s\n"), prikeyfile ? prikeyfile : "<default>");
666 printf (_("rsa key size: %d\n"), rsa_key ? RSA_size (rsa_key) * 8 : -1);
667 printf ("\n");
668
669 printf ("%4s %-17s %s %-8.8s %-10.10s %s\n",
670 _("ID#"), _("MAC"), _("Com"), _("Conmode"), _("Node"), _("Host:Port"));
671
672 for (node_vector::iterator i = nodes.begin (); i != nodes.end (); ++i)
673 (*i)->print ();
674
675 printf ("\n");
676 }
677
678 configuration::configuration ()
679 {
680 asprintf (&confbase, "%s/gvpe", CONFDIR);
681
682 init ();
683 }
684
685 configuration::~configuration ()
686 {
687 cleanup ();
688 }
689