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Revision: 1.42
Committed: Mon Dec 5 12:58:08 2005 UTC (18 years, 5 months ago) by pcg
Content type: text/plain
Branch: MAIN
CVS Tags: rel-2_01, rel-2_0
Changes since 1.41: +28 -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.if_up_data = strdup ("");
153
154 #if ENABLE_DNS
155 default_node.dns_port = 0; // default is 0 == client
156
157 dns_forw_host = strdup ("127.0.0.1");
158 dns_forw_port = 53;
159 dns_timeout_factor = DEFAULT_DNS_TIMEOUT_FACTOR;
160 dns_send_interval = DEFAULT_DNS_SEND_INTERVAL;
161 dns_overlap_factor = DEFAULT_DNS_OVERLAP_FACTOR;
162 dns_max_outstanding = DEFAULT_DNS_MAX_OUTSTANDING;
163 #endif
164
165 conf.pidfilename = strdup (LOCALSTATEDIR "/run/gvpe.pid");
166 }
167
168 void configuration::cleanup()
169 {
170 if (rsa_key)
171 RSA_free (rsa_key);
172
173 rsa_key = 0;
174
175 free (pidfilename); pidfilename = 0;
176 free (ifname); ifname = 0;
177 #if ENABLE_HTTP_PROXY
178 free (proxy_host); proxy_host = 0;
179 free (proxy_auth); proxy_auth = 0;
180 #endif
181 #if ENABLE_DNS
182 free (dns_forw_host); dns_forw_host = 0;
183 #endif
184 }
185
186 void
187 configuration::clear ()
188 {
189 for (configuration::node_vector::iterator i = nodes.begin(); i != nodes.end(); ++i)
190 delete *i;
191
192 nodes.clear ();
193
194 cleanup ();
195 init ();
196 }
197
198 #define parse_bool(target,name,trueval,falseval) do { \
199 if (!strcmp (val, "yes")) target = trueval; \
200 else if (!strcmp (val, "no")) target = falseval; \
201 else if (!strcmp (val, "true")) target = trueval; \
202 else if (!strcmp (val, "false")) target = falseval; \
203 else if (!strcmp (val, "on")) target = trueval; \
204 else if (!strcmp (val, "off")) target = falseval; \
205 else \
206 return _("illegal boolean value, only 'yes|true|on' or 'no|false|off' allowed. (ignored)"); \
207 } while (0)
208
209 const char *
210 configuration_parser::parse_line (char *line)
211 {
212 {
213 char *end = line + strlen (line);
214
215 while (*end < ' ' && end >= line)
216 end--;
217
218 *++end = 0;
219 }
220
221 char *tok = line;
222 const char *var = strtok (tok, "\t =");
223 tok = 0;
224
225 if (!var || !var[0])
226 return 0; /* no tokens on this line */
227
228 if (var[0] == '#')
229 return 0; /* comment: ignore */
230
231 char *val = strtok (NULL, "\t\n\r =");
232
233 if (!val || val[0] == '#')
234 return _("no value given for variable. (ignored)");
235
236 if (!strcmp (var, "on"))
237 {
238 if (!::thisnode
239 || (val[0] == '!' && strcmp (val + 1, ::thisnode))
240 || !strcmp (val, ::thisnode))
241 return parse_line (strtok (NULL, "\n\r"));
242 else
243 return 0;
244 }
245
246 // truly global
247 if (!strcmp (var, "loglevel"))
248 {
249 loglevel l = string_to_loglevel (val);
250
251 if (l == L_NONE)
252 return _("unknown loglevel. (skipping)");
253 }
254 else if (!strcmp (var, "ip-proto"))
255 conf.ip_proto = atoi (val);
256 else if (!strcmp (var, "icmp-type"))
257 {
258 #if ENABLE_ICMP
259 conf.icmp_type = atoi (val);
260 #endif
261 }
262
263 // per config
264 else if (!strcmp (var, "node"))
265 {
266 parse_argv ();
267
268 conf.default_node.id++;
269 node = new conf_node (conf.default_node);
270 conf.nodes.push_back (node);
271 node->nodename = strdup (val);
272
273 {
274 char *fname;
275 FILE *f;
276
277 asprintf (&fname, "%s/pubkey/%s", confbase, node->nodename);
278
279 f = fopen (fname, "r");
280 if (f)
281 {
282 node->rsa_key = RSA_new ();
283
284 if (!PEM_read_RSAPublicKey(f, &node->rsa_key, NULL, NULL))
285 {
286 ERR_load_RSA_strings (); ERR_load_PEM_strings ();
287 slog (L_ERR, _("unable to open public rsa key file '%s': %s"), fname, ERR_error_string (ERR_get_error (), 0));
288 exit (EXIT_FAILURE);
289 }
290
291 require (RSA_blinding_on (node->rsa_key, 0));
292
293 fclose (f);
294 }
295 else
296 {
297 slog (need_keys ? L_ERR : L_NOTICE, _("unable to read public rsa key file '%s': %s"), fname, strerror (errno));
298
299 if (need_keys)
300 exit (EXIT_FAILURE);
301 }
302
303 free (fname);
304 }
305
306 if (::thisnode && !strcmp (node->nodename, ::thisnode))
307 conf.thisnode = node;
308 }
309 else if (!strcmp (var, "private-key"))
310 free (conf.prikeyfile), conf.prikeyfile = strdup (val);
311 else if (!strcmp (var, "ifpersist"))
312 parse_bool (conf.ifpersist, "ifpersist", true, false);
313 else if (!strcmp (var, "ifname"))
314 free (conf.ifname), conf.ifname = strdup (val);
315 else if (!strcmp (var, "rekey"))
316 conf.rekey = atoi (val);
317 else if (!strcmp (var, "keepalive"))
318 conf.keepalive = atoi (val);
319 else if (!strcmp (var, "mtu"))
320 conf.mtu = atoi (val);
321 else if (!strcmp (var, "if-up"))
322 free (conf.script_if_up), conf.script_if_up = strdup (val);
323 else if (!strcmp (var, "node-up"))
324 free (conf.script_node_up), conf.script_node_up = strdup (val);
325 else if (!strcmp (var, "node-down"))
326 free (conf.script_node_down), conf.script_node_down = strdup (val);
327 else if (!strcmp (var, "pid-file"))
328 free (conf.pidfilename), conf.pidfilename = strdup (val);
329 else if (!strcmp (var, "dns-forw-host"))
330 {
331 #if ENABLE_DNS
332 free (conf.dns_forw_host), conf.dns_forw_host = strdup (val);
333 #endif
334 }
335 else if (!strcmp (var, "dns-forw-port"))
336 {
337 #if ENABLE_DNS
338 conf.dns_forw_port = atoi (val);
339 #endif
340 }
341 else if (!strcmp (var, "dns-timeout-factor"))
342 {
343 #if ENABLE_DNS
344 conf.dns_timeout_factor = atof (val);
345 #endif
346 }
347 else if (!strcmp (var, "dns-send-interval"))
348 {
349 #if ENABLE_DNS
350 conf.dns_send_interval = atoi (val);
351 #endif
352 }
353 else if (!strcmp (var, "dns-overlap-factor"))
354 {
355 #if ENABLE_DNS
356 conf.dns_overlap_factor = atof (val);
357 #endif
358 }
359 else if (!strcmp (var, "dns-max-outstanding"))
360 {
361 #if ENABLE_DNS
362 conf.dns_max_outstanding = atoi (val);
363 #endif
364 }
365 else if (!strcmp (var, "http-proxy-host"))
366 {
367 #if ENABLE_HTTP_PROXY
368 free (conf.proxy_host), conf.proxy_host = strdup (val);
369 #endif
370 }
371 else if (!strcmp (var, "http-proxy-port"))
372 {
373 #if ENABLE_HTTP_PROXY
374 conf.proxy_port = atoi (val);
375 #endif
376 }
377 else if (!strcmp (var, "http-proxy-auth"))
378 {
379 #if ENABLE_HTTP_PROXY
380 conf.proxy_auth = (char *)base64_encode ((const u8 *)val, strlen (val));
381 #endif
382 }
383
384 /* node-specific, non-defaultable */
385 else if (node != &conf.default_node && !strcmp (var, "hostname"))
386 free (node->hostname), node->hostname = strdup (val);
387
388 /* node-specific, defaultable */
389 else if (!strcmp (var, "udp-port"))
390 node->udp_port = atoi (val);
391 else if (!strcmp (var, "tcp-port"))
392 node->tcp_port = atoi (val);
393 else if (!strcmp (var, "dns-hostname"))
394 {
395 #if ENABLE_DNS
396 free (node->dns_hostname), node->dns_hostname = strdup (val);
397 #endif
398 }
399 else if (!strcmp (var, "dns-port"))
400 {
401 #if ENABLE_DNS
402 node->dns_port = atoi (val);
403 #endif
404 }
405 else if (!strcmp (var, "dns-domain"))
406 {
407 #if ENABLE_DNS
408 free (node->domain), node->domain = strdup (val);
409 #endif
410 }
411 else if (!strcmp (var, "if-up-data"))
412 free (node->if_up_data), node->if_up_data = strdup (val);
413 else if (!strcmp (var, "router-priority"))
414 node->routerprio = atoi (val);
415 else if (!strcmp (var, "max-retry"))
416 node->max_retry = atoi (val);
417 else if (!strcmp (var, "connect"))
418 {
419 if (!strcmp (val, "ondemand"))
420 node->connectmode = conf_node::C_ONDEMAND;
421 else if (!strcmp (val, "never"))
422 node->connectmode = conf_node::C_NEVER;
423 else if (!strcmp (val, "always"))
424 node->connectmode = conf_node::C_ALWAYS;
425 else if (!strcmp (val, "disabled"))
426 node->connectmode = conf_node::C_DISABLED;
427 else
428 return _("illegal value for 'connectmode', use one of 'ondemand', 'never', 'always' or 'disabled'. (ignored)");
429 }
430 else if (!strcmp (var, "inherit-tos"))
431 parse_bool (node->inherit_tos, "inherit-tos", true, false);
432 else if (!strcmp (var, "compress"))
433 parse_bool (node->compress, "compress", true, false);
434 // all these bool options really really cost a lot of executable size!
435 else if (!strcmp (var, "enable-tcp"))
436 {
437 #if ENABLE_TCP
438 u8 v; parse_bool (v, "enable-tcp" , PROT_TCPv4, 0); node->protocols = (node->protocols & ~PROT_TCPv4) | v;
439 #endif
440 }
441 else if (!strcmp (var, "enable-icmp"))
442 {
443 #if ENABLE_ICMP
444 u8 v; parse_bool (v, "enable-icmp" , PROT_ICMPv4, 0); node->protocols = (node->protocols & ~PROT_ICMPv4) | v;
445 #endif
446 }
447 else if (!strcmp (var, "enable-dns"))
448 {
449 #if ENABLE_DNS
450 u8 v; parse_bool (v, "enable-dns" , PROT_DNSv4, 0); node->protocols = (node->protocols & ~PROT_DNSv4) | v;
451 #endif
452 }
453 else if (!strcmp (var, "enable-udp"))
454 {
455 u8 v; parse_bool (v, "enable-udp" , PROT_UDPv4, 0); node->protocols = (node->protocols & ~PROT_UDPv4) | v;
456 }
457 else if (!strcmp (var, "enable-rawip"))
458 {
459 u8 v; parse_bool (v, "enable-rawip", PROT_IPv4, 0); node->protocols = (node->protocols & ~PROT_IPv4 ) | v;
460 }
461 else if (!strcmp (var, "allow-direct"))
462 node->allow_direct.push_back (strdup (val));
463 else if (!strcmp (var, "deny-direct"))
464 node->deny_direct.push_back (strdup (val));
465
466 // unknown or misplaced
467 else
468 return _("unknown configuration directive. (ignored)");
469
470 return 0;
471 }
472
473 void configuration_parser::parse_argv ()
474 {
475 for (int i = 0; i < argc; ++i)
476 {
477 char *v = argv [i];
478
479 if (!*v)
480 continue;
481
482 char *enode = v;
483
484 while (*enode != '.' && *enode > ' ' && *enode != '=' && *enode)
485 enode++;
486
487 if (*enode != '.')
488 enode = 0;
489
490 char *wnode = node == &conf.default_node
491 ? 0
492 : node->nodename;
493
494 if ((!wnode && !enode)
495 || (wnode && enode && !strncmp (wnode, v, enode - v)))
496 {
497 const char *warn = parse_line (enode ? enode + 1 : v);
498
499 if (warn)
500 slog (L_WARN, _("%s, while parsing command line option '%s'."), warn, v);
501
502 *v = 0;
503 }
504 }
505 }
506
507 configuration_parser::configuration_parser (configuration &conf,
508 bool need_keys,
509 int argc,
510 char **argv)
511 : conf (conf),need_keys (need_keys), argc (argc), argv (argv)
512 {
513 char *fname;
514 FILE *f;
515
516 conf.clear ();
517
518 asprintf (&fname, "%s/gvpe.conf", confbase);
519 f = fopen (fname, "r");
520
521 if (f)
522 {
523 char line[16384];
524 int lineno = 0;
525 node = &conf.default_node;
526
527 while (fgets (line, sizeof (line), f))
528 {
529 lineno++;
530
531 const char *warn = parse_line (line);
532
533 if (warn)
534 slog (L_WARN, _("%s, at '%s', line %d."), warn, fname, lineno);
535 }
536
537 fclose (f);
538
539 parse_argv ();
540 }
541 else
542 {
543 slog (L_ERR, _("unable to read config file '%s': %s"), fname, strerror (errno));
544 exit (EXIT_FAILURE);
545 }
546
547 free (fname);
548
549 fname = conf.config_filename (conf.prikeyfile, "hostkey");
550
551 f = fopen (fname, "r");
552 if (f)
553 {
554 conf.rsa_key = RSA_new ();
555
556 if (!PEM_read_RSAPrivateKey (f, &conf.rsa_key, NULL, NULL))
557 {
558 ERR_load_RSA_strings (); ERR_load_PEM_strings ();
559 slog (L_ERR, _("unable to read private rsa key file '%s': %s"), fname, ERR_error_string (ERR_get_error (), 0));
560 exit (EXIT_FAILURE);
561 }
562
563 require (RSA_blinding_on (conf.rsa_key, 0));
564
565 fclose (f);
566 }
567 else
568 {
569 slog (need_keys ? L_ERR : L_NOTICE, _("unable to open private rsa key file '%s': %s"), fname, strerror (errno));
570
571 if (need_keys)
572 exit (EXIT_FAILURE);
573 }
574
575 if (need_keys && ::thisnode
576 && conf.rsa_key && conf.thisnode && conf.thisnode->rsa_key)
577 if (BN_cmp (conf.rsa_key->n, conf.thisnode->rsa_key->n) != 0
578 || BN_cmp (conf.rsa_key->e, conf.thisnode->rsa_key->e) != 0)
579 {
580 slog (L_NOTICE, _("private hostkey and public node key mismatch: is '%s' the correct node?"), ::thisnode);
581 exit (EXIT_FAILURE);
582 }
583
584 free (fname);
585 }
586
587 char *configuration::config_filename (const char *name, const char *dflt)
588 {
589 char *fname;
590
591 asprintf (&fname, name ? name : dflt, ::thisnode);
592
593 if (!ABSOLUTE_PATH (fname))
594 {
595 char *rname = fname;
596 asprintf (&fname, "%s/%s", confbase, rname);
597 free (rname);
598 }
599
600 return fname;
601 }
602
603 void
604 configuration::print ()
605 {
606 printf (_("\nConfiguration\n\n"));
607 printf (_("# of nodes: %d\n"), nodes.size ());
608 printf (_("this node: %s\n"), thisnode ? thisnode->nodename : "<unset>");
609 printf (_("MTU: %d\n"), mtu);
610 printf (_("rekeying interval: %d\n"), rekey);
611 printf (_("keepalive interval: %d\n"), keepalive);
612 printf (_("interface: %s\n"), ifname);
613 printf (_("primary rsa key: %s\n"), prikeyfile ? prikeyfile : "<default>");
614 printf (_("rsa key size: %d\n"), rsa_key ? RSA_size (rsa_key) * 8 : -1);
615 printf ("\n");
616
617 printf ("%4s %-17s %s %-8.8s %-10.10s %s\n",
618 _("ID#"), _("MAC"), _("Com"), _("Conmode"), _("Node"), _("Host:Port"));
619
620 for (node_vector::iterator i = nodes.begin (); i != nodes.end (); ++i)
621 (*i)->print ();
622
623 printf ("\n");
624 }
625
626 configuration::configuration ()
627 {
628 asprintf (&confbase, "%s/gvpe", CONFDIR);
629
630 init ();
631 }
632
633 configuration::~configuration ()
634 {
635 cleanup ();
636 }
637
638