| 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. 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 "gettext.h" |
| 43 |
|
| 44 |
#include "conf.h" |
| 45 |
#include "slog.h" |
| 46 |
#include "util.h" |
| 47 |
|
| 48 |
char *confbase; |
| 49 |
char *thisnode; |
| 50 |
char *identname; |
| 51 |
|
| 52 |
struct configuration conf; |
| 53 |
|
| 54 |
u8 best_protocol (u8 protset) |
| 55 |
{ |
| 56 |
if (protset & PROT_IPv4 ) return PROT_IPv4; |
| 57 |
if (protset & PROT_ICMPv4) return PROT_ICMPv4; |
| 58 |
if (protset & PROT_UDPv4 ) return PROT_UDPv4; |
| 59 |
if (protset & PROT_TCPv4 ) return PROT_TCPv4; |
| 60 |
if (protset & PROT_DNSv4 ) return PROT_DNSv4; |
| 61 |
|
| 62 |
return 0; |
| 63 |
} |
| 64 |
|
| 65 |
const char *strprotocol (u8 protocol) |
| 66 |
{ |
| 67 |
if (protocol & PROT_IPv4 ) return "rawip"; |
| 68 |
if (protocol & PROT_ICMPv4) return "icmp"; |
| 69 |
if (protocol & PROT_UDPv4 ) return "udp"; |
| 70 |
if (protocol & PROT_TCPv4 ) return "tcp"; |
| 71 |
if (protocol & PROT_DNSv4 ) return "dns"; |
| 72 |
|
| 73 |
return "<unknown>"; |
| 74 |
} |
| 75 |
|
| 76 |
void |
| 77 |
conf_node::print () |
| 78 |
{ |
| 79 |
printf ("%4d fe:fd:80:00:0%1x:%02x %c %-8.8s %-10.10s %s%s%d\n", |
| 80 |
id, |
| 81 |
id >> 8, id & 0xff, |
| 82 |
compress ? 'Y' : 'N', |
| 83 |
connectmode == C_ONDEMAND ? "ondemand" : |
| 84 |
connectmode == C_NEVER ? "never" : |
| 85 |
connectmode == C_ALWAYS ? "always" : "", |
| 86 |
nodename, |
| 87 |
hostname ? hostname : "", |
| 88 |
hostname ? ":" : "", |
| 89 |
hostname ? udp_port : 0 |
| 90 |
); |
| 91 |
} |
| 92 |
|
| 93 |
conf_node::~conf_node () |
| 94 |
{ |
| 95 |
if (rsa_key) |
| 96 |
RSA_free (rsa_key); |
| 97 |
|
| 98 |
free (nodename); |
| 99 |
free (hostname); |
| 100 |
#if ENABLE_DNS |
| 101 |
free (domain); |
| 102 |
free (dns_hostname); |
| 103 |
#endif |
| 104 |
} |
| 105 |
|
| 106 |
void configuration::init () |
| 107 |
{ |
| 108 |
memset (this, 0, sizeof (*this)); |
| 109 |
|
| 110 |
mtu = DEFAULT_MTU; |
| 111 |
rekey = DEFAULT_REKEY; |
| 112 |
keepalive = DEFAULT_KEEPALIVE; |
| 113 |
llevel = L_INFO; |
| 114 |
ip_proto = IPPROTO_GRE; |
| 115 |
#if ENABLE_ICMP |
| 116 |
icmp_type = ICMP_ECHOREPLY; |
| 117 |
#endif |
| 118 |
|
| 119 |
default_node.udp_port = DEFAULT_UDPPORT; |
| 120 |
default_node.tcp_port = DEFAULT_UDPPORT; // ehrm |
| 121 |
default_node.connectmode = conf_node::C_ALWAYS; |
| 122 |
default_node.compress = true; |
| 123 |
default_node.protocols = 0; |
| 124 |
default_node.max_retry = DEFAULT_MAX_RETRY; |
| 125 |
|
| 126 |
#if ENABLE_DNS |
| 127 |
default_node.dns_port = 0; // default is 0 == client |
| 128 |
dns_forw_host = strdup ("127.0.0.1"); |
| 129 |
dns_forw_port = 53; |
| 130 |
#endif |
| 131 |
|
| 132 |
conf.pidfilename = strdup (LOCALSTATEDIR "/run/gvpe.pid"); |
| 133 |
} |
| 134 |
|
| 135 |
void configuration::cleanup() |
| 136 |
{ |
| 137 |
if (rsa_key) |
| 138 |
RSA_free (rsa_key); |
| 139 |
|
| 140 |
rsa_key = 0; |
| 141 |
|
| 142 |
free (pidfilename); pidfilename = 0; |
| 143 |
free (ifname); ifname = 0; |
| 144 |
#if ENABLE_HTTP_PROXY |
| 145 |
free (proxy_host); proxy_host = 0; |
| 146 |
free (proxy_auth); proxy_auth = 0; |
| 147 |
#endif |
| 148 |
#if ENABLE_DNS |
| 149 |
free (dns_forw_host); dns_forw_host = 0; |
| 150 |
#endif |
| 151 |
} |
| 152 |
|
| 153 |
void |
| 154 |
configuration::clear_config () |
| 155 |
{ |
| 156 |
for (configuration::node_vector::iterator i = nodes.begin(); i != nodes.end(); ++i) |
| 157 |
delete *i; |
| 158 |
|
| 159 |
nodes.clear (); |
| 160 |
|
| 161 |
cleanup (); |
| 162 |
init (); |
| 163 |
} |
| 164 |
|
| 165 |
#define parse_bool(target,name,trueval,falseval) \ |
| 166 |
if (!strcmp (val, "yes")) target = trueval; \ |
| 167 |
else if (!strcmp (val, "no")) target = falseval; \ |
| 168 |
else if (!strcmp (val, "true")) target = trueval; \ |
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else if (!strcmp (val, "false")) target = falseval; \ |
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else if (!strcmp (val, "on")) target = trueval; \ |
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else if (!strcmp (val, "off")) target = falseval; \ |
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else \ |
| 173 |
slog (L_WARN, \ |
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_("illegal value for '%s', only 'yes|true|on' or 'no|false|off' allowed, at '%s' line %d"), \ |
| 175 |
name, var, fname, lineno); |
| 176 |
|
| 177 |
void configuration::read_config (bool need_keys) |
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{ |
| 179 |
char *fname; |
| 180 |
FILE *f; |
| 181 |
|
| 182 |
clear_config (); |
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|
| 184 |
asprintf (&fname, "%s/gvpe.conf", confbase); |
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f = fopen (fname, "r"); |
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|
| 187 |
if (f) |
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{ |
| 189 |
char line[16384]; |
| 190 |
int lineno = 0; |
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char *var, *val; |
| 192 |
conf_node *node = &default_node; |
| 193 |
|
| 194 |
while (fgets (line, sizeof (line), f)) |
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{ |
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lineno++; |
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|
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{ |
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char *end = line + strlen (line); |
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|
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while (*end < ' ' && end >= line) |
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end--; |
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|
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*++end = 0; |
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} |
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|
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char *tok = line; |
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|
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retry: |
| 210 |
var = strtok (tok, "\t ="); |
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tok = 0; |
| 212 |
|
| 213 |
if (!var || !var[0]) |
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continue; /* no tokens on this line */ |
| 215 |
|
| 216 |
if (var[0] == '#') |
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continue; /* comment: ignore */ |
| 218 |
|
| 219 |
val = strtok (NULL, "\t\n\r ="); |
| 220 |
|
| 221 |
if (!val || val[0] == '#') |
| 222 |
{ |
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slog (L_WARN, |
| 224 |
_("no value for variable `%s', at '%s' line %d"), |
| 225 |
var, fname, lineno); |
| 226 |
break; |
| 227 |
} |
| 228 |
|
| 229 |
if (!strcmp (var, "on")) |
| 230 |
{ |
| 231 |
if (!::thisnode |
| 232 |
|| (val[0] == '!' && strcmp (val + 1, ::thisnode)) |
| 233 |
|| !strcmp (val, ::thisnode)) |
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goto retry; |
| 235 |
|
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continue; |
| 237 |
} |
| 238 |
|
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// truly global |
| 240 |
if (!strcmp (var, "loglevel")) |
| 241 |
{ |
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loglevel l = string_to_loglevel (val); |
| 243 |
|
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if (l != L_NONE) |
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llevel = l; |
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else |
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slog (L_WARN, "'%s': %s, at '%s' line %d", val, UNKNOWN_LOGLEVEL, fname, line); |
| 248 |
} |
| 249 |
else if (!strcmp (var, "ip-proto")) |
| 250 |
ip_proto = atoi (val); |
| 251 |
else if (!strcmp (var, "icmp-type")) |
| 252 |
{ |
| 253 |
#if ENABLE_ICMP |
| 254 |
icmp_type = atoi (val); |
| 255 |
#endif |
| 256 |
} |
| 257 |
|
| 258 |
// per config |
| 259 |
else if (!strcmp (var, "node")) |
| 260 |
{ |
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default_node.id++; |
| 262 |
|
| 263 |
node = new conf_node (default_node); |
| 264 |
|
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nodes.push_back (node); |
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|
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node->nodename = strdup (val); |
| 268 |
|
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{ |
| 270 |
char *fname; |
| 271 |
FILE *f; |
| 272 |
|
| 273 |
asprintf (&fname, "%s/pubkey/%s", confbase, node->nodename); |
| 274 |
|
| 275 |
f = fopen (fname, "r"); |
| 276 |
if (f) |
| 277 |
{ |
| 278 |
node->rsa_key = RSA_new (); |
| 279 |
|
| 280 |
if (!PEM_read_RSAPublicKey(f, &node->rsa_key, NULL, NULL)) |
| 281 |
{ |
| 282 |
ERR_load_RSA_strings (); ERR_load_PEM_strings (); |
| 283 |
slog (L_ERR, _("unable to open public rsa key file '%s': %s"), fname, ERR_error_string (ERR_get_error (), 0)); |
| 284 |
exit (EXIT_FAILURE); |
| 285 |
} |
| 286 |
|
| 287 |
require (RSA_blinding_on (node->rsa_key, 0)); |
| 288 |
|
| 289 |
fclose (f); |
| 290 |
} |
| 291 |
else |
| 292 |
{ |
| 293 |
slog (need_keys ? L_ERR : L_NOTICE, _("unable to read public rsa key file '%s': %s"), fname, strerror (errno)); |
| 294 |
|
| 295 |
if (need_keys) |
| 296 |
exit (EXIT_FAILURE); |
| 297 |
} |
| 298 |
|
| 299 |
free (fname); |
| 300 |
} |
| 301 |
|
| 302 |
if (::thisnode && !strcmp (node->nodename, ::thisnode)) |
| 303 |
thisnode = node; |
| 304 |
} |
| 305 |
else if (!strcmp (var, "private-key")) |
| 306 |
free (prikeyfile), prikeyfile = strdup (val); |
| 307 |
else if (!strcmp (var, "ifpersist")) |
| 308 |
{ |
| 309 |
parse_bool (ifpersist, "ifpersist", true, false); |
| 310 |
} |
| 311 |
else if (!strcmp (var, "ifname")) |
| 312 |
free (ifname), ifname = strdup (val); |
| 313 |
else if (!strcmp (var, "rekey")) |
| 314 |
rekey = atoi (val); |
| 315 |
else if (!strcmp (var, "keepalive")) |
| 316 |
keepalive = atoi (val); |
| 317 |
else if (!strcmp (var, "mtu")) |
| 318 |
mtu = atoi (val); |
| 319 |
else if (!strcmp (var, "if-up")) |
| 320 |
free (script_if_up), script_if_up = strdup (val); |
| 321 |
else if (!strcmp (var, "node-up")) |
| 322 |
free (script_node_up), script_node_up = strdup (val); |
| 323 |
else if (!strcmp (var, "node-down")) |
| 324 |
free (script_node_down), script_node_down = strdup (val); |
| 325 |
else if (!strcmp (var, "pid-file")) |
| 326 |
free (pidfilename), pidfilename = strdup (val); |
| 327 |
else if (!strcmp (var, "dns-forw-host")) |
| 328 |
{ |
| 329 |
#if ENABLE_DNS |
| 330 |
free (dns_forw_host), dns_forw_host = strdup (val); |
| 331 |
#endif |
| 332 |
} |
| 333 |
else if (!strcmp (var, "dns-forw-port")) |
| 334 |
{ |
| 335 |
#if ENABLE_DNS |
| 336 |
dns_forw_port = atoi (val); |
| 337 |
#endif |
| 338 |
} |
| 339 |
else if (!strcmp (var, "http-proxy-host")) |
| 340 |
{ |
| 341 |
#if ENABLE_HTTP_PROXY |
| 342 |
free (proxy_host), proxy_host = strdup (val); |
| 343 |
#endif |
| 344 |
} |
| 345 |
else if (!strcmp (var, "http-proxy-port")) |
| 346 |
{ |
| 347 |
#if ENABLE_HTTP_PROXY |
| 348 |
proxy_port = atoi (val); |
| 349 |
#endif |
| 350 |
} |
| 351 |
else if (!strcmp (var, "http-proxy-auth")) |
| 352 |
{ |
| 353 |
#if ENABLE_HTTP_PROXY |
| 354 |
proxy_auth = (char *)base64_encode ((const u8 *)val, strlen (val)); |
| 355 |
#endif |
| 356 |
} |
| 357 |
|
| 358 |
/* node-specific, non-defaultable */ |
| 359 |
else if (node != &default_node && !strcmp (var, "hostname")) |
| 360 |
free (node->hostname), node->hostname = strdup (val); |
| 361 |
|
| 362 |
/* node-specific, defaultable */ |
| 363 |
else if (!strcmp (var, "udp-port")) |
| 364 |
node->udp_port = atoi (val); |
| 365 |
else if (!strcmp (var, "tcp-port")) |
| 366 |
node->tcp_port = atoi (val); |
| 367 |
else if (!strcmp (var, "dns-hostname")) |
| 368 |
{ |
| 369 |
#if ENABLE_DNS |
| 370 |
free (node->dns_hostname), node->dns_hostname = strdup (val); |
| 371 |
#endif |
| 372 |
} |
| 373 |
else if (!strcmp (var, "dns-port")) |
| 374 |
{ |
| 375 |
#if ENABLE_DNS |
| 376 |
node->dns_port = atoi (val); |
| 377 |
#endif |
| 378 |
} |
| 379 |
else if (!strcmp (var, "dns-domain")) |
| 380 |
{ |
| 381 |
#if ENABLE_DNS |
| 382 |
free (node->domain), node->domain = strdup (val); |
| 383 |
#endif |
| 384 |
} |
| 385 |
else if (!strcmp (var, "router-priority")) |
| 386 |
node->routerprio = atoi (val); |
| 387 |
else if (!strcmp (var, "max-retry")) |
| 388 |
node->max_retry = atoi (val); |
| 389 |
else if (!strcmp (var, "connect")) |
| 390 |
{ |
| 391 |
if (!strcmp (val, "ondemand")) |
| 392 |
node->connectmode = conf_node::C_ONDEMAND; |
| 393 |
else if (!strcmp (val, "never")) |
| 394 |
node->connectmode = conf_node::C_NEVER; |
| 395 |
else if (!strcmp (val, "always")) |
| 396 |
node->connectmode = conf_node::C_ALWAYS; |
| 397 |
else if (!strcmp (val, "disabled")) |
| 398 |
node->connectmode = conf_node::C_DISABLED; |
| 399 |
else |
| 400 |
slog (L_WARN, |
| 401 |
_("illegal value for 'connectmode', use one of 'ondemand', 'never', 'always' or 'disabled', at '%s' line %d"), |
| 402 |
var, fname, lineno); |
| 403 |
} |
| 404 |
else if (!strcmp (var, "inherit-tos")) |
| 405 |
{ |
| 406 |
parse_bool (node->inherit_tos, "inherit-tos", true, false); |
| 407 |
} |
| 408 |
else if (!strcmp (var, "compress")) |
| 409 |
{ |
| 410 |
parse_bool (node->compress, "compress", true, false); |
| 411 |
} |
| 412 |
// all these bool options really really cost a lot of executable size! |
| 413 |
else if (!strcmp (var, "enable-tcp")) |
| 414 |
{ |
| 415 |
#if ENABLE_TCP |
| 416 |
u8 v; parse_bool (v, "enable-tcp" , PROT_TCPv4, 0); node->protocols = (node->protocols & ~PROT_TCPv4) | v; |
| 417 |
#endif |
| 418 |
} |
| 419 |
else if (!strcmp (var, "enable-icmp")) |
| 420 |
{ |
| 421 |
#if ENABLE_ICMP |
| 422 |
u8 v; parse_bool (v, "enable-icmp" , PROT_ICMPv4, 0); node->protocols = (node->protocols & ~PROT_ICMPv4) | v; |
| 423 |
#endif |
| 424 |
} |
| 425 |
else if (!strcmp (var, "enable-dns")) |
| 426 |
{ |
| 427 |
#if ENABLE_DNS |
| 428 |
u8 v; parse_bool (v, "enable-dns" , PROT_DNSv4, 0); node->protocols = (node->protocols & ~PROT_DNSv4) | v; |
| 429 |
#endif |
| 430 |
} |
| 431 |
else if (!strcmp (var, "enable-udp")) |
| 432 |
{ |
| 433 |
u8 v; parse_bool (v, "enable-udp" , PROT_UDPv4, 0); node->protocols = (node->protocols & ~PROT_UDPv4) | v; |
| 434 |
} |
| 435 |
else if (!strcmp (var, "enable-rawip")) |
| 436 |
{ |
| 437 |
u8 v; parse_bool (v, "enable-rawip", PROT_IPv4, 0); node->protocols = (node->protocols & ~PROT_IPv4 ) | v; |
| 438 |
} |
| 439 |
|
| 440 |
// unknown or misplaced |
| 441 |
else |
| 442 |
slog (L_WARN, |
| 443 |
_("unknown or misplaced variable `%s', at '%s' line %d"), |
| 444 |
var, fname, lineno); |
| 445 |
} |
| 446 |
|
| 447 |
fclose (f); |
| 448 |
} |
| 449 |
else |
| 450 |
{ |
| 451 |
slog (L_ERR, _("unable to read config file '%s': %s"), fname, strerror (errno)); |
| 452 |
exit (EXIT_FAILURE); |
| 453 |
} |
| 454 |
|
| 455 |
free (fname); |
| 456 |
|
| 457 |
fname = config_filename (prikeyfile, "hostkey"); |
| 458 |
|
| 459 |
f = fopen (fname, "r"); |
| 460 |
if (f) |
| 461 |
{ |
| 462 |
rsa_key = RSA_new (); |
| 463 |
|
| 464 |
if (!PEM_read_RSAPrivateKey (f, &rsa_key, NULL, NULL)) |
| 465 |
{ |
| 466 |
ERR_load_RSA_strings (); ERR_load_PEM_strings (); |
| 467 |
slog (L_ERR, _("unable to read private rsa key file '%s': %s"), fname, ERR_error_string (ERR_get_error (), 0)); |
| 468 |
exit (EXIT_FAILURE); |
| 469 |
} |
| 470 |
|
| 471 |
require (RSA_blinding_on (rsa_key, 0)); |
| 472 |
|
| 473 |
fclose (f); |
| 474 |
} |
| 475 |
else |
| 476 |
{ |
| 477 |
slog (need_keys ? L_ERR : L_NOTICE, _("unable to open private rsa key file '%s': %s"), fname, strerror (errno)); |
| 478 |
|
| 479 |
if (need_keys) |
| 480 |
exit (EXIT_FAILURE); |
| 481 |
} |
| 482 |
|
| 483 |
if (need_keys && ::thisnode |
| 484 |
&& rsa_key && thisnode && thisnode->rsa_key) |
| 485 |
if (BN_cmp (rsa_key->n, thisnode->rsa_key->n) != 0 |
| 486 |
|| BN_cmp (rsa_key->e, thisnode->rsa_key->e) != 0) |
| 487 |
{ |
| 488 |
slog (L_NOTICE, _("private hostkey and public node key mismatch: is '%s' the correct node?"), ::thisnode); |
| 489 |
exit (EXIT_FAILURE); |
| 490 |
} |
| 491 |
|
| 492 |
free (fname); |
| 493 |
} |
| 494 |
|
| 495 |
char *configuration::config_filename (const char *name, const char *dflt) |
| 496 |
{ |
| 497 |
char *fname; |
| 498 |
|
| 499 |
asprintf (&fname, name ? name : dflt, ::thisnode); |
| 500 |
|
| 501 |
if (!ABSOLUTE_PATH (fname)) |
| 502 |
{ |
| 503 |
char *rname = fname; |
| 504 |
asprintf (&fname, "%s/%s", confbase, rname); |
| 505 |
free (rname); |
| 506 |
} |
| 507 |
|
| 508 |
return fname; |
| 509 |
} |
| 510 |
|
| 511 |
void |
| 512 |
configuration::print () |
| 513 |
{ |
| 514 |
printf (_("\nConfiguration\n\n")); |
| 515 |
printf (_("# of nodes: %d\n"), nodes.size ()); |
| 516 |
printf (_("this node: %s\n"), thisnode ? thisnode->nodename : "<unset>"); |
| 517 |
printf (_("MTU: %d\n"), mtu); |
| 518 |
printf (_("rekeying interval: %d\n"), rekey); |
| 519 |
printf (_("keepalive interval: %d\n"), keepalive); |
| 520 |
printf (_("interface: %s\n"), ifname); |
| 521 |
printf (_("primary rsa key: %s\n"), prikeyfile ? prikeyfile : "<default>"); |
| 522 |
printf (_("rsa key size: %d\n"), rsa_key ? RSA_size (rsa_key) * 8 : -1); |
| 523 |
printf ("\n"); |
| 524 |
|
| 525 |
printf ("%4s %-17s %s %-8.8s %-10.10s %s\n", |
| 526 |
_("ID#"), _("MAC"), _("Com"), _("Conmode"), _("Node"), _("Host:Port")); |
| 527 |
|
| 528 |
for (node_vector::iterator i = nodes.begin (); i != nodes.end (); ++i) |
| 529 |
(*i)->print (); |
| 530 |
|
| 531 |
printf ("\n"); |
| 532 |
} |
| 533 |
|
| 534 |
configuration::configuration () |
| 535 |
{ |
| 536 |
asprintf (&confbase, "%s/gvpe", CONFDIR); |
| 537 |
|
| 538 |
init (); |
| 539 |
} |
| 540 |
|
| 541 |
configuration::~configuration () |
| 542 |
{ |
| 543 |
cleanup (); |
| 544 |
} |
| 545 |
|
| 546 |
|
