ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/gvpe/src/conf.C
Revision: 1.43
Committed: Thu Aug 7 16:34:21 2008 UTC (15 years, 9 months ago) by pcg
Content type: text/plain
Branch: MAIN
Changes since 1.42: +6 -0 lines
Log Message:
*** empty log message ***

File Contents

# Content
1 /*
2 conf.c -- configuration code
3 Copyright (C) 2003-2005 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
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with gvpe; if not, write to the Free Software
19 Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "config.h"
23
24 #include <cstdio>
25 #include <cstdlib>
26 #include <cstring>
27
28 #include <errno.h>
29 #include <netdb.h>
30 #include <sys/stat.h>
31 #include <sys/types.h>
32 #include <unistd.h>
33
34 #include "netcompat.h"
35
36 #include <openssl/err.h>
37 #include <openssl/pem.h>
38 #include <openssl/rsa.h>
39 #include <openssl/rand.h>
40 #include <openssl/bn.h>
41
42 #include "conf.h"
43 #include "slog.h"
44 #include "util.h"
45
46 char *confbase;
47 char *thisnode;
48 char *identname;
49
50 struct configuration conf;
51
52 u8 best_protocol (u8 protset)
53 {
54 if (protset & PROT_IPv4 ) return PROT_IPv4;
55 if (protset & PROT_ICMPv4) return PROT_ICMPv4;
56 if (protset & PROT_UDPv4 ) return PROT_UDPv4;
57 if (protset & PROT_TCPv4 ) return PROT_TCPv4;
58 if (protset & PROT_DNSv4 ) return PROT_DNSv4;
59
60 return 0;
61 }
62
63 const char *strprotocol (u8 protocol)
64 {
65 if (protocol & PROT_IPv4 ) return "rawip";
66 if (protocol & PROT_ICMPv4) return "icmp";
67 if (protocol & PROT_UDPv4 ) return "udp";
68 if (protocol & PROT_TCPv4 ) return "tcp";
69 if (protocol & PROT_DNSv4 ) return "dns";
70
71 return "<unknown>";
72 }
73
74 static bool
75 match_list (const vector<const char *> &list, const char *str)
76 {
77 for (vector<const char *>::const_iterator i = list.end (); i-- > list.begin (); )
78 if ((*i)[0] == '*' && !(*i)[1])
79 return true;
80 else if (!strcmp (*i, str))
81 return true;
82
83 return false;
84 }
85
86 bool
87 conf_node::can_direct (struct conf_node *other)
88 {
89 if (match_list (allow_direct, other->nodename))
90 return true;
91
92 if (match_list (deny_direct, other->nodename))
93 return false;
94
95 return true;
96 }
97
98 void
99 conf_node::print ()
100 {
101 printf ("%4d fe:fd:80:00:0%1x:%02x %c %-8.8s %-10.10s %s%s%d\n",
102 id,
103 id >> 8, id & 0xff,
104 compress ? 'Y' : 'N',
105 connectmode == C_ONDEMAND ? "ondemand" :
106 connectmode == C_NEVER ? "never" :
107 connectmode == C_ALWAYS ? "always" : "",
108 nodename,
109 hostname ? hostname : "",
110 hostname ? ":" : "",
111 hostname ? udp_port : 0
112 );
113 }
114
115 conf_node::~conf_node ()
116 {
117 #if 0
118 // does not work, because string pointers etc. are shared
119 // is not called, however
120 if (rsa_key)
121 RSA_free (rsa_key);
122
123 free (nodename);
124 free (hostname);
125 free (if_up_data);
126 #if ENABLE_DNS
127 free (domain);
128 free (dns_hostname);
129 #endif
130 #endif
131 }
132
133 void configuration::init ()
134 {
135 memset (this, 0, sizeof (*this));
136
137 mtu = DEFAULT_MTU;
138 rekey = DEFAULT_REKEY;
139 keepalive = DEFAULT_KEEPALIVE;
140 llevel = L_INFO;
141 ip_proto = IPPROTO_GRE;
142 #if ENABLE_ICMP
143 icmp_type = ICMP_ECHOREPLY;
144 #endif
145
146 default_node.udp_port = DEFAULT_UDPPORT;
147 default_node.tcp_port = DEFAULT_UDPPORT; // ehrm
148 default_node.connectmode = conf_node::C_ALWAYS;
149 default_node.compress = true;
150 default_node.protocols = 0;
151 default_node.max_retry = DEFAULT_MAX_RETRY;
152 default_node.max_ttl = DEFAULT_MAX_TTL;
153 default_node.max_queue = DEFAULT_MAX_QUEUE;
154 default_node.if_up_data = strdup ("");
155
156 #if ENABLE_DNS
157 default_node.dns_port = 0; // default is 0 == client
158
159 dns_forw_host = strdup ("127.0.0.1");
160 dns_forw_port = 53;
161 dns_timeout_factor = DEFAULT_DNS_TIMEOUT_FACTOR;
162 dns_send_interval = DEFAULT_DNS_SEND_INTERVAL;
163 dns_overlap_factor = DEFAULT_DNS_OVERLAP_FACTOR;
164 dns_max_outstanding = DEFAULT_DNS_MAX_OUTSTANDING;
165 #endif
166
167 conf.pidfilename = strdup (LOCALSTATEDIR "/run/gvpe.pid");
168 }
169
170 void configuration::cleanup()
171 {
172 if (rsa_key)
173 RSA_free (rsa_key);
174
175 rsa_key = 0;
176
177 free (pidfilename); pidfilename = 0;
178 free (ifname); ifname = 0;
179 #if ENABLE_HTTP_PROXY
180 free (proxy_host); proxy_host = 0;
181 free (proxy_auth); proxy_auth = 0;
182 #endif
183 #if ENABLE_DNS
184 free (dns_forw_host); dns_forw_host = 0;
185 #endif
186 }
187
188 void
189 configuration::clear ()
190 {
191 for (configuration::node_vector::iterator i = nodes.begin(); i != nodes.end(); ++i)
192 delete *i;
193
194 nodes.clear ();
195
196 cleanup ();
197 init ();
198 }
199
200 #define parse_bool(target,name,trueval,falseval) do { \
201 if (!strcmp (val, "yes")) target = trueval; \
202 else if (!strcmp (val, "no")) target = falseval; \
203 else if (!strcmp (val, "true")) target = trueval; \
204 else if (!strcmp (val, "false")) target = falseval; \
205 else if (!strcmp (val, "on")) target = trueval; \
206 else if (!strcmp (val, "off")) target = falseval; \
207 else \
208 return _("illegal boolean value, only 'yes|true|on' or 'no|false|off' allowed. (ignored)"); \
209 } while (0)
210
211 const char *
212 configuration_parser::parse_line (char *line)
213 {
214 {
215 char *end = line + strlen (line);
216
217 while (*end < ' ' && end >= line)
218 end--;
219
220 *++end = 0;
221 }
222
223 char *tok = line;
224 const char *var = strtok (tok, "\t =");
225 tok = 0;
226
227 if (!var || !var[0])
228 return 0; /* no tokens on this line */
229
230 if (var[0] == '#')
231 return 0; /* comment: ignore */
232
233 char *val = strtok (NULL, "\t\n\r =");
234
235 if (!val || val[0] == '#')
236 return _("no value given for variable. (ignored)");
237
238 if (!strcmp (var, "on"))
239 {
240 if (!::thisnode
241 || (val[0] == '!' && strcmp (val + 1, ::thisnode))
242 || !strcmp (val, ::thisnode))
243 return parse_line (strtok (NULL, "\n\r"));
244 else
245 return 0;
246 }
247
248 // truly global
249 if (!strcmp (var, "loglevel"))
250 {
251 loglevel l = string_to_loglevel (val);
252
253 if (l == L_NONE)
254 return _("unknown loglevel. (skipping)");
255 }
256 else if (!strcmp (var, "ip-proto"))
257 conf.ip_proto = atoi (val);
258 else if (!strcmp (var, "icmp-type"))
259 {
260 #if ENABLE_ICMP
261 conf.icmp_type = atoi (val);
262 #endif
263 }
264
265 // per config
266 else if (!strcmp (var, "node"))
267 {
268 parse_argv ();
269
270 conf.default_node.id++;
271 node = new conf_node (conf.default_node);
272 conf.nodes.push_back (node);
273 node->nodename = strdup (val);
274
275 {
276 char *fname;
277 FILE *f;
278
279 asprintf (&fname, "%s/pubkey/%s", confbase, node->nodename);
280
281 f = fopen (fname, "r");
282 if (f)
283 {
284 node->rsa_key = RSA_new ();
285
286 if (!PEM_read_RSAPublicKey(f, &node->rsa_key, NULL, NULL))
287 {
288 ERR_load_RSA_strings (); ERR_load_PEM_strings ();
289 slog (L_ERR, _("unable to open public rsa key file '%s': %s"), fname, ERR_error_string (ERR_get_error (), 0));
290 exit (EXIT_FAILURE);
291 }
292
293 require (RSA_blinding_on (node->rsa_key, 0));
294
295 fclose (f);
296 }
297 else
298 {
299 slog (need_keys ? L_ERR : L_NOTICE, _("unable to read public rsa key file '%s': %s"), fname, strerror (errno));
300
301 if (need_keys)
302 exit (EXIT_FAILURE);
303 }
304
305 free (fname);
306 }
307
308 if (::thisnode && !strcmp (node->nodename, ::thisnode))
309 conf.thisnode = node;
310 }
311 else if (!strcmp (var, "private-key"))
312 free (conf.prikeyfile), conf.prikeyfile = strdup (val);
313 else if (!strcmp (var, "ifpersist"))
314 parse_bool (conf.ifpersist, "ifpersist", true, false);
315 else if (!strcmp (var, "ifname"))
316 free (conf.ifname), conf.ifname = strdup (val);
317 else if (!strcmp (var, "rekey"))
318 conf.rekey = atoi (val);
319 else if (!strcmp (var, "keepalive"))
320 conf.keepalive = atoi (val);
321 else if (!strcmp (var, "mtu"))
322 conf.mtu = atoi (val);
323 else if (!strcmp (var, "if-up"))
324 free (conf.script_if_up), conf.script_if_up = strdup (val);
325 else if (!strcmp (var, "node-up"))
326 free (conf.script_node_up), conf.script_node_up = strdup (val);
327 else if (!strcmp (var, "node-down"))
328 free (conf.script_node_down), conf.script_node_down = strdup (val);
329 else if (!strcmp (var, "pid-file"))
330 free (conf.pidfilename), conf.pidfilename = strdup (val);
331 else if (!strcmp (var, "dns-forw-host"))
332 {
333 #if ENABLE_DNS
334 free (conf.dns_forw_host), conf.dns_forw_host = strdup (val);
335 #endif
336 }
337 else if (!strcmp (var, "dns-forw-port"))
338 {
339 #if ENABLE_DNS
340 conf.dns_forw_port = atoi (val);
341 #endif
342 }
343 else if (!strcmp (var, "dns-timeout-factor"))
344 {
345 #if ENABLE_DNS
346 conf.dns_timeout_factor = atof (val);
347 #endif
348 }
349 else if (!strcmp (var, "dns-send-interval"))
350 {
351 #if ENABLE_DNS
352 conf.dns_send_interval = atoi (val);
353 #endif
354 }
355 else if (!strcmp (var, "dns-overlap-factor"))
356 {
357 #if ENABLE_DNS
358 conf.dns_overlap_factor = atof (val);
359 #endif
360 }
361 else if (!strcmp (var, "dns-max-outstanding"))
362 {
363 #if ENABLE_DNS
364 conf.dns_max_outstanding = atoi (val);
365 #endif
366 }
367 else if (!strcmp (var, "http-proxy-host"))
368 {
369 #if ENABLE_HTTP_PROXY
370 free (conf.proxy_host), conf.proxy_host = strdup (val);
371 #endif
372 }
373 else if (!strcmp (var, "http-proxy-port"))
374 {
375 #if ENABLE_HTTP_PROXY
376 conf.proxy_port = atoi (val);
377 #endif
378 }
379 else if (!strcmp (var, "http-proxy-auth"))
380 {
381 #if ENABLE_HTTP_PROXY
382 conf.proxy_auth = (char *)base64_encode ((const u8 *)val, strlen (val));
383 #endif
384 }
385
386 /* node-specific, non-defaultable */
387 else if (node != &conf.default_node && !strcmp (var, "hostname"))
388 free (node->hostname), node->hostname = strdup (val);
389
390 /* node-specific, defaultable */
391 else if (!strcmp (var, "udp-port"))
392 node->udp_port = atoi (val);
393 else if (!strcmp (var, "tcp-port"))
394 node->tcp_port = atoi (val);
395 else if (!strcmp (var, "dns-hostname"))
396 {
397 #if ENABLE_DNS
398 free (node->dns_hostname), node->dns_hostname = strdup (val);
399 #endif
400 }
401 else if (!strcmp (var, "dns-port"))
402 {
403 #if ENABLE_DNS
404 node->dns_port = atoi (val);
405 #endif
406 }
407 else if (!strcmp (var, "dns-domain"))
408 {
409 #if ENABLE_DNS
410 free (node->domain), node->domain = strdup (val);
411 #endif
412 }
413 else if (!strcmp (var, "if-up-data"))
414 free (node->if_up_data), node->if_up_data = strdup (val);
415 else if (!strcmp (var, "router-priority"))
416 node->routerprio = atoi (val);
417 else if (!strcmp (var, "max-retry"))
418 node->max_retry = atoi (val);
419 else if (!strcmp (var, "connect"))
420 {
421 if (!strcmp (val, "ondemand"))
422 node->connectmode = conf_node::C_ONDEMAND;
423 else if (!strcmp (val, "never"))
424 node->connectmode = conf_node::C_NEVER;
425 else if (!strcmp (val, "always"))
426 node->connectmode = conf_node::C_ALWAYS;
427 else if (!strcmp (val, "disabled"))
428 node->connectmode = conf_node::C_DISABLED;
429 else
430 return _("illegal value for 'connectmode', use one of 'ondemand', 'never', 'always' or 'disabled'. (ignored)");
431 }
432 else if (!strcmp (var, "inherit-tos"))
433 parse_bool (node->inherit_tos, "inherit-tos", true, false);
434 else if (!strcmp (var, "compress"))
435 parse_bool (node->compress, "compress", true, false);
436 // all these bool options really really cost a lot of executable size!
437 else if (!strcmp (var, "enable-tcp"))
438 {
439 #if ENABLE_TCP
440 u8 v; parse_bool (v, "enable-tcp" , PROT_TCPv4, 0); node->protocols = (node->protocols & ~PROT_TCPv4) | v;
441 #endif
442 }
443 else if (!strcmp (var, "enable-icmp"))
444 {
445 #if ENABLE_ICMP
446 u8 v; parse_bool (v, "enable-icmp" , PROT_ICMPv4, 0); node->protocols = (node->protocols & ~PROT_ICMPv4) | v;
447 #endif
448 }
449 else if (!strcmp (var, "enable-dns"))
450 {
451 #if ENABLE_DNS
452 u8 v; parse_bool (v, "enable-dns" , PROT_DNSv4, 0); node->protocols = (node->protocols & ~PROT_DNSv4) | v;
453 #endif
454 }
455 else if (!strcmp (var, "enable-udp"))
456 {
457 u8 v; parse_bool (v, "enable-udp" , PROT_UDPv4, 0); node->protocols = (node->protocols & ~PROT_UDPv4) | v;
458 }
459 else if (!strcmp (var, "enable-rawip"))
460 {
461 u8 v; parse_bool (v, "enable-rawip", PROT_IPv4, 0); node->protocols = (node->protocols & ~PROT_IPv4 ) | v;
462 }
463 else if (!strcmp (var, "allow-direct"))
464 node->allow_direct.push_back (strdup (val));
465 else if (!strcmp (var, "deny-direct"))
466 node->deny_direct.push_back (strdup (val));
467 else if (!strcmp (var, "max-ttl"))
468 node->max_ttl = atof (val);
469 else if (!strcmp (var, "max-queue"))
470 node->max_queue = atoi (val);
471
472 // unknown or misplaced
473 else
474 return _("unknown configuration directive. (ignored)");
475
476 return 0;
477 }
478
479 void configuration_parser::parse_argv ()
480 {
481 for (int i = 0; i < argc; ++i)
482 {
483 char *v = argv [i];
484
485 if (!*v)
486 continue;
487
488 char *enode = v;
489
490 while (*enode != '.' && *enode > ' ' && *enode != '=' && *enode)
491 enode++;
492
493 if (*enode != '.')
494 enode = 0;
495
496 char *wnode = node == &conf.default_node
497 ? 0
498 : node->nodename;
499
500 if ((!wnode && !enode)
501 || (wnode && enode && !strncmp (wnode, v, enode - v)))
502 {
503 const char *warn = parse_line (enode ? enode + 1 : v);
504
505 if (warn)
506 slog (L_WARN, _("%s, while parsing command line option '%s'."), warn, v);
507
508 *v = 0;
509 }
510 }
511 }
512
513 configuration_parser::configuration_parser (configuration &conf,
514 bool need_keys,
515 int argc,
516 char **argv)
517 : conf (conf),need_keys (need_keys), argc (argc), argv (argv)
518 {
519 char *fname;
520 FILE *f;
521
522 conf.clear ();
523
524 asprintf (&fname, "%s/gvpe.conf", confbase);
525 f = fopen (fname, "r");
526
527 if (f)
528 {
529 char line[16384];
530 int lineno = 0;
531 node = &conf.default_node;
532
533 while (fgets (line, sizeof (line), f))
534 {
535 lineno++;
536
537 const char *warn = parse_line (line);
538
539 if (warn)
540 slog (L_WARN, _("%s, at '%s', line %d."), warn, fname, lineno);
541 }
542
543 fclose (f);
544
545 parse_argv ();
546 }
547 else
548 {
549 slog (L_ERR, _("unable to read config file '%s': %s"), fname, strerror (errno));
550 exit (EXIT_FAILURE);
551 }
552
553 free (fname);
554
555 fname = conf.config_filename (conf.prikeyfile, "hostkey");
556
557 f = fopen (fname, "r");
558 if (f)
559 {
560 conf.rsa_key = RSA_new ();
561
562 if (!PEM_read_RSAPrivateKey (f, &conf.rsa_key, NULL, NULL))
563 {
564 ERR_load_RSA_strings (); ERR_load_PEM_strings ();
565 slog (L_ERR, _("unable to read private rsa key file '%s': %s"), fname, ERR_error_string (ERR_get_error (), 0));
566 exit (EXIT_FAILURE);
567 }
568
569 require (RSA_blinding_on (conf.rsa_key, 0));
570
571 fclose (f);
572 }
573 else
574 {
575 slog (need_keys ? L_ERR : L_NOTICE, _("unable to open private rsa key file '%s': %s"), fname, strerror (errno));
576
577 if (need_keys)
578 exit (EXIT_FAILURE);
579 }
580
581 if (need_keys && ::thisnode
582 && conf.rsa_key && conf.thisnode && conf.thisnode->rsa_key)
583 if (BN_cmp (conf.rsa_key->n, conf.thisnode->rsa_key->n) != 0
584 || BN_cmp (conf.rsa_key->e, conf.thisnode->rsa_key->e) != 0)
585 {
586 slog (L_NOTICE, _("private hostkey and public node key mismatch: is '%s' the correct node?"), ::thisnode);
587 exit (EXIT_FAILURE);
588 }
589
590 free (fname);
591 }
592
593 char *configuration::config_filename (const char *name, const char *dflt)
594 {
595 char *fname;
596
597 asprintf (&fname, name ? name : dflt, ::thisnode);
598
599 if (!ABSOLUTE_PATH (fname))
600 {
601 char *rname = fname;
602 asprintf (&fname, "%s/%s", confbase, rname);
603 free (rname);
604 }
605
606 return fname;
607 }
608
609 void
610 configuration::print ()
611 {
612 printf (_("\nConfiguration\n\n"));
613 printf (_("# of nodes: %d\n"), nodes.size ());
614 printf (_("this node: %s\n"), thisnode ? thisnode->nodename : "<unset>");
615 printf (_("MTU: %d\n"), mtu);
616 printf (_("rekeying interval: %d\n"), rekey);
617 printf (_("keepalive interval: %d\n"), keepalive);
618 printf (_("interface: %s\n"), ifname);
619 printf (_("primary rsa key: %s\n"), prikeyfile ? prikeyfile : "<default>");
620 printf (_("rsa key size: %d\n"), rsa_key ? RSA_size (rsa_key) * 8 : -1);
621 printf ("\n");
622
623 printf ("%4s %-17s %s %-8.8s %-10.10s %s\n",
624 _("ID#"), _("MAC"), _("Com"), _("Conmode"), _("Node"), _("Host:Port"));
625
626 for (node_vector::iterator i = nodes.begin (); i != nodes.end (); ++i)
627 (*i)->print ();
628
629 printf ("\n");
630 }
631
632 configuration::configuration ()
633 {
634 asprintf (&confbase, "%s/gvpe", CONFDIR);
635
636 init ();
637 }
638
639 configuration::~configuration ()
640 {
641 cleanup ();
642 }
643
644