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1 | /* | |
2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> | |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * All rights reserved | |
5 | * Functions for reading the configuration files. | |
6 | * | |
7 | * As far as I am concerned, the code I have written for this software | |
8 | * can be used freely for any purpose. Any derived versions of this | |
9 | * software must be clearly marked as such, and if the derived work is | |
10 | * incompatible with the protocol description in the RFC file, it must be | |
11 | * called by a name other than "ssh" or "Secure Shell". | |
12 | */ | |
13 | ||
14 | #include "includes.h" | |
15 | RCSID("$OpenBSD: readconf.c,v 1.144 2005/12/06 22:38:27 reyk Exp $"); | |
16 | ||
17 | #include "ssh.h" | |
18 | #include "xmalloc.h" | |
19 | #include "compat.h" | |
20 | #include "cipher.h" | |
21 | #include "pathnames.h" | |
22 | #include "log.h" | |
23 | #include "readconf.h" | |
24 | #include "match.h" | |
25 | #include "misc.h" | |
26 | #include "kex.h" | |
27 | #include "mac.h" | |
28 | ||
29 | /* Format of the configuration file: | |
30 | ||
31 | # Configuration data is parsed as follows: | |
32 | # 1. command line options | |
33 | # 2. user-specific file | |
34 | # 3. system-wide file | |
35 | # Any configuration value is only changed the first time it is set. | |
36 | # Thus, host-specific definitions should be at the beginning of the | |
37 | # configuration file, and defaults at the end. | |
38 | ||
39 | # Host-specific declarations. These may override anything above. A single | |
40 | # host may match multiple declarations; these are processed in the order | |
41 | # that they are given in. | |
42 | ||
43 | Host *.ngs.fi ngs.fi | |
44 | User foo | |
45 | ||
46 | Host fake.com | |
47 | HostName another.host.name.real.org | |
48 | User blaah | |
49 | Port 34289 | |
50 | ForwardX11 no | |
51 | ForwardAgent no | |
52 | ||
53 | Host books.com | |
54 | RemoteForward 9999 shadows.cs.hut.fi:9999 | |
55 | Cipher 3des | |
56 | ||
57 | Host fascist.blob.com | |
58 | Port 23123 | |
59 | User tylonen | |
60 | PasswordAuthentication no | |
61 | ||
62 | Host puukko.hut.fi | |
63 | User t35124p | |
64 | ProxyCommand ssh-proxy %h %p | |
65 | ||
66 | Host *.fr | |
67 | PublicKeyAuthentication no | |
68 | ||
69 | Host *.su | |
70 | Cipher none | |
71 | PasswordAuthentication no | |
72 | ||
73 | Host vpn.fake.com | |
74 | Tunnel yes | |
75 | TunnelDevice 3 | |
76 | ||
77 | # Defaults for various options | |
78 | Host * | |
79 | ForwardAgent no | |
80 | ForwardX11 no | |
81 | PasswordAuthentication yes | |
82 | RSAAuthentication yes | |
83 | RhostsRSAAuthentication yes | |
84 | StrictHostKeyChecking yes | |
85 | TcpKeepAlive no | |
86 | IdentityFile ~/.ssh/identity | |
87 | Port 22 | |
88 | EscapeChar ~ | |
89 | ||
90 | */ | |
91 | ||
92 | /* Keyword tokens. */ | |
93 | ||
94 | typedef enum { | |
95 | oBadOption, | |
96 | oForwardAgent, oForwardX11, oForwardX11Trusted, oGatewayPorts, | |
97 | oPasswordAuthentication, oRSAAuthentication, | |
98 | oChallengeResponseAuthentication, oXAuthLocation, | |
99 | oIdentityFile, oHostName, oPort, oCipher, oRemoteForward, oLocalForward, | |
100 | oUser, oHost, oEscapeChar, oRhostsRSAAuthentication, oProxyCommand, | |
101 | oGlobalKnownHostsFile, oUserKnownHostsFile, oConnectionAttempts, | |
102 | oBatchMode, oCheckHostIP, oStrictHostKeyChecking, oCompression, | |
103 | oCompressionLevel, oTCPKeepAlive, oNumberOfPasswordPrompts, | |
104 | oUsePrivilegedPort, oLogLevel, oCiphers, oProtocol, oMacs, | |
105 | oGlobalKnownHostsFile2, oUserKnownHostsFile2, oPubkeyAuthentication, | |
106 | oKbdInteractiveAuthentication, oKbdInteractiveDevices, oHostKeyAlias, | |
107 | oDynamicForward, oPreferredAuthentications, oHostbasedAuthentication, | |
108 | oHostKeyAlgorithms, oBindAddress, oSmartcardDevice, | |
109 | oClearAllForwardings, oNoHostAuthenticationForLocalhost, | |
110 | oEnableSSHKeysign, oRekeyLimit, oVerifyHostKeyDNS, oConnectTimeout, | |
111 | oAddressFamily, oGssAuthentication, oGssDelegateCreds, | |
112 | oServerAliveInterval, oServerAliveCountMax, oIdentitiesOnly, | |
113 | oSendEnv, oControlPath, oControlMaster, oHashKnownHosts, | |
114 | oTunnel, oTunnelDevice, oLocalCommand, oPermitLocalCommand, | |
115 | oDeprecated, oUnsupported | |
116 | } OpCodes; | |
117 | ||
118 | /* Textual representations of the tokens. */ | |
119 | ||
120 | static struct { | |
121 | const char *name; | |
122 | OpCodes opcode; | |
123 | } keywords[] = { | |
124 | { "forwardagent", oForwardAgent }, | |
125 | { "forwardx11", oForwardX11 }, | |
126 | { "forwardx11trusted", oForwardX11Trusted }, | |
127 | { "xauthlocation", oXAuthLocation }, | |
128 | { "gatewayports", oGatewayPorts }, | |
129 | { "useprivilegedport", oUsePrivilegedPort }, | |
130 | { "rhostsauthentication", oDeprecated }, | |
131 | { "passwordauthentication", oPasswordAuthentication }, | |
132 | { "kbdinteractiveauthentication", oKbdInteractiveAuthentication }, | |
133 | { "kbdinteractivedevices", oKbdInteractiveDevices }, | |
134 | { "rsaauthentication", oRSAAuthentication }, | |
135 | { "pubkeyauthentication", oPubkeyAuthentication }, | |
136 | { "dsaauthentication", oPubkeyAuthentication }, /* alias */ | |
137 | { "rhostsrsaauthentication", oRhostsRSAAuthentication }, | |
138 | { "hostbasedauthentication", oHostbasedAuthentication }, | |
139 | { "challengeresponseauthentication", oChallengeResponseAuthentication }, | |
140 | { "skeyauthentication", oChallengeResponseAuthentication }, /* alias */ | |
141 | { "tisauthentication", oChallengeResponseAuthentication }, /* alias */ | |
142 | { "kerberosauthentication", oUnsupported }, | |
143 | { "kerberostgtpassing", oUnsupported }, | |
144 | { "afstokenpassing", oUnsupported }, | |
145 | #if defined(GSSAPI) | |
146 | { "gssapiauthentication", oGssAuthentication }, | |
147 | { "gssapidelegatecredentials", oGssDelegateCreds }, | |
148 | #else | |
149 | { "gssapiauthentication", oUnsupported }, | |
150 | { "gssapidelegatecredentials", oUnsupported }, | |
151 | #endif | |
152 | { "fallbacktorsh", oDeprecated }, | |
153 | { "usersh", oDeprecated }, | |
154 | { "identityfile", oIdentityFile }, | |
155 | { "identityfile2", oIdentityFile }, /* alias */ | |
156 | { "identitiesonly", oIdentitiesOnly }, | |
157 | { "hostname", oHostName }, | |
158 | { "hostkeyalias", oHostKeyAlias }, | |
159 | { "proxycommand", oProxyCommand }, | |
160 | { "port", oPort }, | |
161 | { "cipher", oCipher }, | |
162 | { "ciphers", oCiphers }, | |
163 | { "macs", oMacs }, | |
164 | { "protocol", oProtocol }, | |
165 | { "remoteforward", oRemoteForward }, | |
166 | { "localforward", oLocalForward }, | |
167 | { "user", oUser }, | |
168 | { "host", oHost }, | |
169 | { "escapechar", oEscapeChar }, | |
170 | { "globalknownhostsfile", oGlobalKnownHostsFile }, | |
171 | { "userknownhostsfile", oUserKnownHostsFile }, /* obsolete */ | |
172 | { "globalknownhostsfile2", oGlobalKnownHostsFile2 }, | |
173 | { "userknownhostsfile2", oUserKnownHostsFile2 }, /* obsolete */ | |
174 | { "connectionattempts", oConnectionAttempts }, | |
175 | { "batchmode", oBatchMode }, | |
176 | { "checkhostip", oCheckHostIP }, | |
177 | { "stricthostkeychecking", oStrictHostKeyChecking }, | |
178 | { "compression", oCompression }, | |
179 | { "compressionlevel", oCompressionLevel }, | |
180 | { "tcpkeepalive", oTCPKeepAlive }, | |
181 | { "keepalive", oTCPKeepAlive }, /* obsolete */ | |
182 | { "numberofpasswordprompts", oNumberOfPasswordPrompts }, | |
183 | { "loglevel", oLogLevel }, | |
184 | { "dynamicforward", oDynamicForward }, | |
185 | { "preferredauthentications", oPreferredAuthentications }, | |
186 | { "hostkeyalgorithms", oHostKeyAlgorithms }, | |
187 | { "bindaddress", oBindAddress }, | |
188 | #ifdef SMARTCARD | |
189 | { "smartcarddevice", oSmartcardDevice }, | |
190 | #else | |
191 | { "smartcarddevice", oUnsupported }, | |
192 | #endif | |
193 | { "clearallforwardings", oClearAllForwardings }, | |
194 | { "enablesshkeysign", oEnableSSHKeysign }, | |
195 | { "verifyhostkeydns", oVerifyHostKeyDNS }, | |
196 | { "nohostauthenticationforlocalhost", oNoHostAuthenticationForLocalhost }, | |
197 | { "rekeylimit", oRekeyLimit }, | |
198 | { "connecttimeout", oConnectTimeout }, | |
199 | { "addressfamily", oAddressFamily }, | |
200 | { "serveraliveinterval", oServerAliveInterval }, | |
201 | { "serveralivecountmax", oServerAliveCountMax }, | |
202 | { "sendenv", oSendEnv }, | |
203 | { "controlpath", oControlPath }, | |
204 | { "controlmaster", oControlMaster }, | |
205 | { "hashknownhosts", oHashKnownHosts }, | |
206 | { "tunnel", oTunnel }, | |
207 | { "tunneldevice", oTunnelDevice }, | |
208 | { "localcommand", oLocalCommand }, | |
209 | { "permitlocalcommand", oPermitLocalCommand }, | |
210 | { NULL, oBadOption } | |
211 | }; | |
212 | ||
213 | /* | |
214 | * Adds a local TCP/IP port forward to options. Never returns if there is an | |
215 | * error. | |
216 | */ | |
217 | ||
218 | void | |
219 | add_local_forward(Options *options, const Forward *newfwd) | |
220 | { | |
221 | Forward *fwd; | |
222 | #ifndef NO_IPPORT_RESERVED_CONCEPT | |
223 | extern uid_t original_real_uid; | |
224 | if (newfwd->listen_port < IPPORT_RESERVED && original_real_uid != 0) | |
225 | fatal("Privileged ports can only be forwarded by root."); | |
226 | #endif | |
227 | if (options->num_local_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
228 | fatal("Too many local forwards (max %d).", SSH_MAX_FORWARDS_PER_DIRECTION); | |
229 | fwd = &options->local_forwards[options->num_local_forwards++]; | |
230 | ||
231 | fwd->listen_host = (newfwd->listen_host == NULL) ? | |
232 | NULL : xstrdup(newfwd->listen_host); | |
233 | fwd->listen_port = newfwd->listen_port; | |
234 | fwd->connect_host = xstrdup(newfwd->connect_host); | |
235 | fwd->connect_port = newfwd->connect_port; | |
236 | } | |
237 | ||
238 | /* | |
239 | * Adds a remote TCP/IP port forward to options. Never returns if there is | |
240 | * an error. | |
241 | */ | |
242 | ||
243 | void | |
244 | add_remote_forward(Options *options, const Forward *newfwd) | |
245 | { | |
246 | Forward *fwd; | |
247 | if (options->num_remote_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
248 | fatal("Too many remote forwards (max %d).", | |
249 | SSH_MAX_FORWARDS_PER_DIRECTION); | |
250 | fwd = &options->remote_forwards[options->num_remote_forwards++]; | |
251 | ||
252 | fwd->listen_host = (newfwd->listen_host == NULL) ? | |
253 | NULL : xstrdup(newfwd->listen_host); | |
254 | fwd->listen_port = newfwd->listen_port; | |
255 | fwd->connect_host = xstrdup(newfwd->connect_host); | |
256 | fwd->connect_port = newfwd->connect_port; | |
257 | } | |
258 | ||
259 | static void | |
260 | clear_forwardings(Options *options) | |
261 | { | |
262 | int i; | |
263 | ||
264 | for (i = 0; i < options->num_local_forwards; i++) { | |
265 | if (options->local_forwards[i].listen_host != NULL) | |
266 | xfree(options->local_forwards[i].listen_host); | |
267 | xfree(options->local_forwards[i].connect_host); | |
268 | } | |
269 | options->num_local_forwards = 0; | |
270 | for (i = 0; i < options->num_remote_forwards; i++) { | |
271 | if (options->remote_forwards[i].listen_host != NULL) | |
272 | xfree(options->remote_forwards[i].listen_host); | |
273 | xfree(options->remote_forwards[i].connect_host); | |
274 | } | |
275 | options->num_remote_forwards = 0; | |
276 | options->tun_open = 0; | |
277 | } | |
278 | ||
279 | /* | |
280 | * Returns the number of the token pointed to by cp or oBadOption. | |
281 | */ | |
282 | ||
283 | static OpCodes | |
284 | parse_token(const char *cp, const char *filename, int linenum) | |
285 | { | |
286 | u_int i; | |
287 | ||
288 | for (i = 0; keywords[i].name; i++) | |
289 | if (strcasecmp(cp, keywords[i].name) == 0) | |
290 | return keywords[i].opcode; | |
291 | ||
292 | error("%s: line %d: Bad configuration option: %s", | |
293 | filename, linenum, cp); | |
294 | return oBadOption; | |
295 | } | |
296 | ||
297 | /* | |
298 | * Processes a single option line as used in the configuration files. This | |
299 | * only sets those values that have not already been set. | |
300 | */ | |
301 | #define WHITESPACE " \t\r\n" | |
302 | ||
303 | int | |
304 | process_config_line(Options *options, const char *host, | |
305 | char *line, const char *filename, int linenum, | |
306 | int *activep) | |
307 | { | |
308 | char *s, **charptr, *endofnumber, *keyword, *arg, *arg2, fwdarg[256]; | |
309 | int opcode, *intptr, value, value2; | |
310 | size_t len; | |
311 | Forward fwd; | |
312 | ||
313 | /* Strip trailing whitespace */ | |
314 | for (len = strlen(line) - 1; len > 0; len--) { | |
315 | if (strchr(WHITESPACE, line[len]) == NULL) | |
316 | break; | |
317 | line[len] = '\0'; | |
318 | } | |
319 | ||
320 | s = line; | |
321 | /* Get the keyword. (Each line is supposed to begin with a keyword). */ | |
322 | keyword = strdelim(&s); | |
323 | /* Ignore leading whitespace. */ | |
324 | if (*keyword == '\0') | |
325 | keyword = strdelim(&s); | |
326 | if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#') | |
327 | return 0; | |
328 | ||
329 | opcode = parse_token(keyword, filename, linenum); | |
330 | ||
331 | switch (opcode) { | |
332 | case oBadOption: | |
333 | /* don't panic, but count bad options */ | |
334 | return -1; | |
335 | /* NOTREACHED */ | |
336 | case oConnectTimeout: | |
337 | intptr = &options->connection_timeout; | |
338 | parse_time: | |
339 | arg = strdelim(&s); | |
340 | if (!arg || *arg == '\0') | |
341 | fatal("%s line %d: missing time value.", | |
342 | filename, linenum); | |
343 | if ((value = convtime(arg)) == -1) | |
344 | fatal("%s line %d: invalid time value.", | |
345 | filename, linenum); | |
346 | if (*intptr == -1) | |
347 | *intptr = value; | |
348 | break; | |
349 | ||
350 | case oForwardAgent: | |
351 | intptr = &options->forward_agent; | |
352 | parse_flag: | |
353 | arg = strdelim(&s); | |
354 | if (!arg || *arg == '\0') | |
355 | fatal("%.200s line %d: Missing yes/no argument.", filename, linenum); | |
356 | value = 0; /* To avoid compiler warning... */ | |
357 | if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0) | |
358 | value = 1; | |
359 | else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0) | |
360 | value = 0; | |
361 | else | |
362 | fatal("%.200s line %d: Bad yes/no argument.", filename, linenum); | |
363 | if (*activep && *intptr == -1) | |
364 | *intptr = value; | |
365 | break; | |
366 | ||
367 | case oForwardX11: | |
368 | intptr = &options->forward_x11; | |
369 | goto parse_flag; | |
370 | ||
371 | case oForwardX11Trusted: | |
372 | intptr = &options->forward_x11_trusted; | |
373 | goto parse_flag; | |
374 | ||
375 | case oGatewayPorts: | |
376 | intptr = &options->gateway_ports; | |
377 | goto parse_flag; | |
378 | ||
379 | case oUsePrivilegedPort: | |
380 | intptr = &options->use_privileged_port; | |
381 | goto parse_flag; | |
382 | ||
383 | case oPasswordAuthentication: | |
384 | intptr = &options->password_authentication; | |
385 | goto parse_flag; | |
386 | ||
387 | case oKbdInteractiveAuthentication: | |
388 | intptr = &options->kbd_interactive_authentication; | |
389 | goto parse_flag; | |
390 | ||
391 | case oKbdInteractiveDevices: | |
392 | charptr = &options->kbd_interactive_devices; | |
393 | goto parse_string; | |
394 | ||
395 | case oPubkeyAuthentication: | |
396 | intptr = &options->pubkey_authentication; | |
397 | goto parse_flag; | |
398 | ||
399 | case oRSAAuthentication: | |
400 | intptr = &options->rsa_authentication; | |
401 | goto parse_flag; | |
402 | ||
403 | case oRhostsRSAAuthentication: | |
404 | intptr = &options->rhosts_rsa_authentication; | |
405 | goto parse_flag; | |
406 | ||
407 | case oHostbasedAuthentication: | |
408 | intptr = &options->hostbased_authentication; | |
409 | goto parse_flag; | |
410 | ||
411 | case oChallengeResponseAuthentication: | |
412 | intptr = &options->challenge_response_authentication; | |
413 | goto parse_flag; | |
414 | ||
415 | case oGssAuthentication: | |
416 | intptr = &options->gss_authentication; | |
417 | goto parse_flag; | |
418 | ||
419 | case oGssDelegateCreds: | |
420 | intptr = &options->gss_deleg_creds; | |
421 | goto parse_flag; | |
422 | ||
423 | case oBatchMode: | |
424 | intptr = &options->batch_mode; | |
425 | goto parse_flag; | |
426 | ||
427 | case oCheckHostIP: | |
428 | intptr = &options->check_host_ip; | |
429 | goto parse_flag; | |
430 | ||
431 | case oVerifyHostKeyDNS: | |
432 | intptr = &options->verify_host_key_dns; | |
433 | goto parse_yesnoask; | |
434 | ||
435 | case oStrictHostKeyChecking: | |
436 | intptr = &options->strict_host_key_checking; | |
437 | parse_yesnoask: | |
438 | arg = strdelim(&s); | |
439 | if (!arg || *arg == '\0') | |
440 | fatal("%.200s line %d: Missing yes/no/ask argument.", | |
441 | filename, linenum); | |
442 | value = 0; /* To avoid compiler warning... */ | |
443 | if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0) | |
444 | value = 1; | |
445 | else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0) | |
446 | value = 0; | |
447 | else if (strcmp(arg, "ask") == 0) | |
448 | value = 2; | |
449 | else | |
450 | fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum); | |
451 | if (*activep && *intptr == -1) | |
452 | *intptr = value; | |
453 | break; | |
454 | ||
455 | case oCompression: | |
456 | intptr = &options->compression; | |
457 | goto parse_flag; | |
458 | ||
459 | case oTCPKeepAlive: | |
460 | intptr = &options->tcp_keep_alive; | |
461 | goto parse_flag; | |
462 | ||
463 | case oNoHostAuthenticationForLocalhost: | |
464 | intptr = &options->no_host_authentication_for_localhost; | |
465 | goto parse_flag; | |
466 | ||
467 | case oNumberOfPasswordPrompts: | |
468 | intptr = &options->number_of_password_prompts; | |
469 | goto parse_int; | |
470 | ||
471 | case oCompressionLevel: | |
472 | intptr = &options->compression_level; | |
473 | goto parse_int; | |
474 | ||
475 | case oRekeyLimit: | |
476 | intptr = &options->rekey_limit; | |
477 | arg = strdelim(&s); | |
478 | if (!arg || *arg == '\0') | |
479 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
480 | if (arg[0] < '0' || arg[0] > '9') | |
481 | fatal("%.200s line %d: Bad number.", filename, linenum); | |
482 | value = strtol(arg, &endofnumber, 10); | |
483 | if (arg == endofnumber) | |
484 | fatal("%.200s line %d: Bad number.", filename, linenum); | |
485 | switch (toupper(*endofnumber)) { | |
486 | case 'K': | |
487 | value *= 1<<10; | |
488 | break; | |
489 | case 'M': | |
490 | value *= 1<<20; | |
491 | break; | |
492 | case 'G': | |
493 | value *= 1<<30; | |
494 | break; | |
495 | } | |
496 | if (*activep && *intptr == -1) | |
497 | *intptr = value; | |
498 | break; | |
499 | ||
500 | case oIdentityFile: | |
501 | arg = strdelim(&s); | |
502 | if (!arg || *arg == '\0') | |
503 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
504 | if (*activep) { | |
505 | intptr = &options->num_identity_files; | |
506 | if (*intptr >= SSH_MAX_IDENTITY_FILES) | |
507 | fatal("%.200s line %d: Too many identity files specified (max %d).", | |
508 | filename, linenum, SSH_MAX_IDENTITY_FILES); | |
509 | charptr = &options->identity_files[*intptr]; | |
510 | *charptr = xstrdup(arg); | |
511 | *intptr = *intptr + 1; | |
512 | } | |
513 | break; | |
514 | ||
515 | case oXAuthLocation: | |
516 | charptr=&options->xauth_location; | |
517 | goto parse_string; | |
518 | ||
519 | case oUser: | |
520 | charptr = &options->user; | |
521 | parse_string: | |
522 | arg = strdelim(&s); | |
523 | if (!arg || *arg == '\0') | |
524 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
525 | if (*activep && *charptr == NULL) | |
526 | *charptr = xstrdup(arg); | |
527 | break; | |
528 | ||
529 | case oGlobalKnownHostsFile: | |
530 | charptr = &options->system_hostfile; | |
531 | goto parse_string; | |
532 | ||
533 | case oUserKnownHostsFile: | |
534 | charptr = &options->user_hostfile; | |
535 | goto parse_string; | |
536 | ||
537 | case oGlobalKnownHostsFile2: | |
538 | charptr = &options->system_hostfile2; | |
539 | goto parse_string; | |
540 | ||
541 | case oUserKnownHostsFile2: | |
542 | charptr = &options->user_hostfile2; | |
543 | goto parse_string; | |
544 | ||
545 | case oHostName: | |
546 | charptr = &options->hostname; | |
547 | goto parse_string; | |
548 | ||
549 | case oHostKeyAlias: | |
550 | charptr = &options->host_key_alias; | |
551 | goto parse_string; | |
552 | ||
553 | case oPreferredAuthentications: | |
554 | charptr = &options->preferred_authentications; | |
555 | goto parse_string; | |
556 | ||
557 | case oBindAddress: | |
558 | charptr = &options->bind_address; | |
559 | goto parse_string; | |
560 | ||
561 | case oSmartcardDevice: | |
562 | charptr = &options->smartcard_device; | |
563 | goto parse_string; | |
564 | ||
565 | case oProxyCommand: | |
566 | charptr = &options->proxy_command; | |
567 | parse_command: | |
568 | if (s == NULL) | |
569 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
570 | len = strspn(s, WHITESPACE "="); | |
571 | if (*activep && *charptr == NULL) | |
572 | *charptr = xstrdup(s + len); | |
573 | return 0; | |
574 | ||
575 | case oPort: | |
576 | intptr = &options->port; | |
577 | parse_int: | |
578 | arg = strdelim(&s); | |
579 | if (!arg || *arg == '\0') | |
580 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
581 | if (arg[0] < '0' || arg[0] > '9') | |
582 | fatal("%.200s line %d: Bad number.", filename, linenum); | |
583 | ||
584 | /* Octal, decimal, or hex format? */ | |
585 | value = strtol(arg, &endofnumber, 0); | |
586 | if (arg == endofnumber) | |
587 | fatal("%.200s line %d: Bad number.", filename, linenum); | |
588 | if (*activep && *intptr == -1) | |
589 | *intptr = value; | |
590 | break; | |
591 | ||
592 | case oConnectionAttempts: | |
593 | intptr = &options->connection_attempts; | |
594 | goto parse_int; | |
595 | ||
596 | case oCipher: | |
597 | intptr = &options->cipher; | |
598 | arg = strdelim(&s); | |
599 | if (!arg || *arg == '\0') | |
600 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
601 | value = cipher_number(arg); | |
602 | if (value == -1) | |
603 | fatal("%.200s line %d: Bad cipher '%s'.", | |
604 | filename, linenum, arg ? arg : "<NONE>"); | |
605 | if (*activep && *intptr == -1) | |
606 | *intptr = value; | |
607 | break; | |
608 | ||
609 | case oCiphers: | |
610 | arg = strdelim(&s); | |
611 | if (!arg || *arg == '\0') | |
612 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
613 | if (!ciphers_valid(arg)) | |
614 | fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.", | |
615 | filename, linenum, arg ? arg : "<NONE>"); | |
616 | if (*activep && options->ciphers == NULL) | |
617 | options->ciphers = xstrdup(arg); | |
618 | break; | |
619 | ||
620 | case oMacs: | |
621 | arg = strdelim(&s); | |
622 | if (!arg || *arg == '\0') | |
623 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
624 | if (!mac_valid(arg)) | |
625 | fatal("%.200s line %d: Bad SSH2 Mac spec '%s'.", | |
626 | filename, linenum, arg ? arg : "<NONE>"); | |
627 | if (*activep && options->macs == NULL) | |
628 | options->macs = xstrdup(arg); | |
629 | break; | |
630 | ||
631 | case oHostKeyAlgorithms: | |
632 | arg = strdelim(&s); | |
633 | if (!arg || *arg == '\0') | |
634 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
635 | if (!key_names_valid2(arg)) | |
636 | fatal("%.200s line %d: Bad protocol 2 host key algorithms '%s'.", | |
637 | filename, linenum, arg ? arg : "<NONE>"); | |
638 | if (*activep && options->hostkeyalgorithms == NULL) | |
639 | options->hostkeyalgorithms = xstrdup(arg); | |
640 | break; | |
641 | ||
642 | case oProtocol: | |
643 | intptr = &options->protocol; | |
644 | arg = strdelim(&s); | |
645 | if (!arg || *arg == '\0') | |
646 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
647 | value = proto_spec(arg); | |
648 | if (value == SSH_PROTO_UNKNOWN) | |
649 | fatal("%.200s line %d: Bad protocol spec '%s'.", | |
650 | filename, linenum, arg ? arg : "<NONE>"); | |
651 | if (*activep && *intptr == SSH_PROTO_UNKNOWN) | |
652 | *intptr = value; | |
653 | break; | |
654 | ||
655 | case oLogLevel: | |
656 | intptr = (int *) &options->log_level; | |
657 | arg = strdelim(&s); | |
658 | value = log_level_number(arg); | |
659 | if (value == SYSLOG_LEVEL_NOT_SET) | |
660 | fatal("%.200s line %d: unsupported log level '%s'", | |
661 | filename, linenum, arg ? arg : "<NONE>"); | |
662 | if (*activep && (LogLevel) *intptr == SYSLOG_LEVEL_NOT_SET) | |
663 | *intptr = (LogLevel) value; | |
664 | break; | |
665 | ||
666 | case oLocalForward: | |
667 | case oRemoteForward: | |
668 | arg = strdelim(&s); | |
669 | if (arg == NULL || *arg == '\0') | |
670 | fatal("%.200s line %d: Missing port argument.", | |
671 | filename, linenum); | |
672 | arg2 = strdelim(&s); | |
673 | if (arg2 == NULL || *arg2 == '\0') | |
674 | fatal("%.200s line %d: Missing target argument.", | |
675 | filename, linenum); | |
676 | ||
677 | /* construct a string for parse_forward */ | |
678 | snprintf(fwdarg, sizeof(fwdarg), "%s:%s", arg, arg2); | |
679 | ||
680 | if (parse_forward(&fwd, fwdarg) == 0) | |
681 | fatal("%.200s line %d: Bad forwarding specification.", | |
682 | filename, linenum); | |
683 | ||
684 | if (*activep) { | |
685 | if (opcode == oLocalForward) | |
686 | add_local_forward(options, &fwd); | |
687 | else if (opcode == oRemoteForward) | |
688 | add_remote_forward(options, &fwd); | |
689 | } | |
690 | break; | |
691 | ||
692 | case oDynamicForward: | |
693 | arg = strdelim(&s); | |
694 | if (!arg || *arg == '\0') | |
695 | fatal("%.200s line %d: Missing port argument.", | |
696 | filename, linenum); | |
697 | memset(&fwd, '\0', sizeof(fwd)); | |
698 | fwd.connect_host = "socks"; | |
699 | fwd.listen_host = hpdelim(&arg); | |
700 | if (fwd.listen_host == NULL || | |
701 | strlen(fwd.listen_host) >= NI_MAXHOST) | |
702 | fatal("%.200s line %d: Bad forwarding specification.", | |
703 | filename, linenum); | |
704 | if (arg) { | |
705 | fwd.listen_port = a2port(arg); | |
706 | fwd.listen_host = cleanhostname(fwd.listen_host); | |
707 | } else { | |
708 | fwd.listen_port = a2port(fwd.listen_host); | |
709 | fwd.listen_host = NULL; | |
710 | } | |
711 | if (fwd.listen_port == 0) | |
712 | fatal("%.200s line %d: Badly formatted port number.", | |
713 | filename, linenum); | |
714 | if (*activep) | |
715 | add_local_forward(options, &fwd); | |
716 | break; | |
717 | ||
718 | case oClearAllForwardings: | |
719 | intptr = &options->clear_forwardings; | |
720 | goto parse_flag; | |
721 | ||
722 | case oHost: | |
723 | *activep = 0; | |
724 | while ((arg = strdelim(&s)) != NULL && *arg != '\0') | |
725 | if (match_pattern(host, arg)) { | |
726 | debug("Applying options for %.100s", arg); | |
727 | *activep = 1; | |
728 | break; | |
729 | } | |
730 | /* Avoid garbage check below, as strdelim is done. */ | |
731 | return 0; | |
732 | ||
733 | case oEscapeChar: | |
734 | intptr = &options->escape_char; | |
735 | arg = strdelim(&s); | |
736 | if (!arg || *arg == '\0') | |
737 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
738 | if (arg[0] == '^' && arg[2] == 0 && | |
739 | (u_char) arg[1] >= 64 && (u_char) arg[1] < 128) | |
740 | value = (u_char) arg[1] & 31; | |
741 | else if (strlen(arg) == 1) | |
742 | value = (u_char) arg[0]; | |
743 | else if (strcmp(arg, "none") == 0) | |
744 | value = SSH_ESCAPECHAR_NONE; | |
745 | else { | |
746 | fatal("%.200s line %d: Bad escape character.", | |
747 | filename, linenum); | |
748 | /* NOTREACHED */ | |
749 | value = 0; /* Avoid compiler warning. */ | |
750 | } | |
751 | if (*activep && *intptr == -1) | |
752 | *intptr = value; | |
753 | break; | |
754 | ||
755 | case oAddressFamily: | |
756 | arg = strdelim(&s); | |
757 | if (!arg || *arg == '\0') | |
758 | fatal("%s line %d: missing address family.", | |
759 | filename, linenum); | |
760 | intptr = &options->address_family; | |
761 | if (strcasecmp(arg, "inet") == 0) | |
762 | value = AF_INET; | |
763 | else if (strcasecmp(arg, "inet6") == 0) | |
764 | value = AF_INET6; | |
765 | else if (strcasecmp(arg, "any") == 0) | |
766 | value = AF_UNSPEC; | |
767 | else | |
768 | fatal("Unsupported AddressFamily \"%s\"", arg); | |
769 | if (*activep && *intptr == -1) | |
770 | *intptr = value; | |
771 | break; | |
772 | ||
773 | case oEnableSSHKeysign: | |
774 | intptr = &options->enable_ssh_keysign; | |
775 | goto parse_flag; | |
776 | ||
777 | case oIdentitiesOnly: | |
778 | intptr = &options->identities_only; | |
779 | goto parse_flag; | |
780 | ||
781 | case oServerAliveInterval: | |
782 | intptr = &options->server_alive_interval; | |
783 | goto parse_time; | |
784 | ||
785 | case oServerAliveCountMax: | |
786 | intptr = &options->server_alive_count_max; | |
787 | goto parse_int; | |
788 | ||
789 | case oSendEnv: | |
790 | while ((arg = strdelim(&s)) != NULL && *arg != '\0') { | |
791 | if (strchr(arg, '=') != NULL) | |
792 | fatal("%s line %d: Invalid environment name.", | |
793 | filename, linenum); | |
794 | if (!*activep) | |
795 | continue; | |
796 | if (options->num_send_env >= MAX_SEND_ENV) | |
797 | fatal("%s line %d: too many send env.", | |
798 | filename, linenum); | |
799 | options->send_env[options->num_send_env++] = | |
800 | xstrdup(arg); | |
801 | } | |
802 | break; | |
803 | ||
804 | case oControlPath: | |
805 | charptr = &options->control_path; | |
806 | goto parse_string; | |
807 | ||
808 | case oControlMaster: | |
809 | intptr = &options->control_master; | |
810 | arg = strdelim(&s); | |
811 | if (!arg || *arg == '\0') | |
812 | fatal("%.200s line %d: Missing ControlMaster argument.", | |
813 | filename, linenum); | |
814 | value = 0; /* To avoid compiler warning... */ | |
815 | if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0) | |
816 | value = SSHCTL_MASTER_YES; | |
817 | else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0) | |
818 | value = SSHCTL_MASTER_NO; | |
819 | else if (strcmp(arg, "auto") == 0) | |
820 | value = SSHCTL_MASTER_AUTO; | |
821 | else if (strcmp(arg, "ask") == 0) | |
822 | value = SSHCTL_MASTER_ASK; | |
823 | else if (strcmp(arg, "autoask") == 0) | |
824 | value = SSHCTL_MASTER_AUTO_ASK; | |
825 | else | |
826 | fatal("%.200s line %d: Bad ControlMaster argument.", | |
827 | filename, linenum); | |
828 | if (*activep && *intptr == -1) | |
829 | *intptr = value; | |
830 | break; | |
831 | ||
832 | case oHashKnownHosts: | |
833 | intptr = &options->hash_known_hosts; | |
834 | goto parse_flag; | |
835 | ||
836 | case oTunnel: | |
837 | intptr = &options->tun_open; | |
838 | goto parse_flag; | |
839 | ||
840 | case oTunnelDevice: | |
841 | arg = strdelim(&s); | |
842 | if (!arg || *arg == '\0') | |
843 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
844 | value = a2tun(arg, &value2); | |
845 | if (value < -1) | |
846 | fatal("%.200s line %d: Bad tun device.", filename, linenum); | |
847 | if (*activep) { | |
848 | options->tun_local = value; | |
849 | options->tun_remote = value2; | |
850 | } | |
851 | break; | |
852 | ||
853 | case oLocalCommand: | |
854 | charptr = &options->local_command; | |
855 | goto parse_command; | |
856 | ||
857 | case oPermitLocalCommand: | |
858 | intptr = &options->permit_local_command; | |
859 | goto parse_flag; | |
860 | ||
861 | case oDeprecated: | |
862 | debug("%s line %d: Deprecated option \"%s\"", | |
863 | filename, linenum, keyword); | |
864 | return 0; | |
865 | ||
866 | case oUnsupported: | |
867 | error("%s line %d: Unsupported option \"%s\"", | |
868 | filename, linenum, keyword); | |
869 | return 0; | |
870 | ||
871 | default: | |
872 | fatal("process_config_line: Unimplemented opcode %d", opcode); | |
873 | } | |
874 | ||
875 | /* Check that there is no garbage at end of line. */ | |
876 | if ((arg = strdelim(&s)) != NULL && *arg != '\0') { | |
877 | fatal("%.200s line %d: garbage at end of line; \"%.200s\".", | |
878 | filename, linenum, arg); | |
879 | } | |
880 | return 0; | |
881 | } | |
882 | ||
883 | ||
884 | /* | |
885 | * Reads the config file and modifies the options accordingly. Options | |
886 | * should already be initialized before this call. This never returns if | |
887 | * there is an error. If the file does not exist, this returns 0. | |
888 | */ | |
889 | ||
890 | int | |
891 | read_config_file(const char *filename, const char *host, Options *options, | |
892 | int checkperm) | |
893 | { | |
894 | FILE *f; | |
895 | char line[1024]; | |
896 | int active, linenum; | |
897 | int bad_options = 0; | |
898 | ||
899 | /* Open the file. */ | |
900 | if ((f = fopen(filename, "r")) == NULL) | |
901 | return 0; | |
902 | ||
903 | if (checkperm) { | |
904 | struct stat sb; | |
905 | ||
906 | if (fstat(fileno(f), &sb) == -1) | |
907 | fatal("fstat %s: %s", filename, strerror(errno)); | |
908 | if (((sb.st_uid != 0 && sb.st_uid != getuid()) || | |
909 | (sb.st_mode & 022) != 0)) | |
910 | fatal("Bad owner or permissions on %s", filename); | |
911 | } | |
912 | ||
913 | debug("Reading configuration data %.200s", filename); | |
914 | ||
915 | /* | |
916 | * Mark that we are now processing the options. This flag is turned | |
917 | * on/off by Host specifications. | |
918 | */ | |
919 | active = 1; | |
920 | linenum = 0; | |
921 | while (fgets(line, sizeof(line), f)) { | |
922 | /* Update line number counter. */ | |
923 | linenum++; | |
924 | if (process_config_line(options, host, line, filename, linenum, &active) != 0) | |
925 | bad_options++; | |
926 | } | |
927 | fclose(f); | |
928 | if (bad_options > 0) | |
929 | fatal("%s: terminating, %d bad configuration options", | |
930 | filename, bad_options); | |
931 | return 1; | |
932 | } | |
933 | ||
934 | /* | |
935 | * Initializes options to special values that indicate that they have not yet | |
936 | * been set. Read_config_file will only set options with this value. Options | |
937 | * are processed in the following order: command line, user config file, | |
938 | * system config file. Last, fill_default_options is called. | |
939 | */ | |
940 | ||
941 | void | |
942 | initialize_options(Options * options) | |
943 | { | |
944 | memset(options, 'X', sizeof(*options)); | |
945 | options->forward_agent = -1; | |
946 | options->forward_x11 = -1; | |
947 | options->forward_x11_trusted = -1; | |
948 | options->xauth_location = NULL; | |
949 | options->gateway_ports = -1; | |
950 | options->use_privileged_port = -1; | |
951 | options->rsa_authentication = -1; | |
952 | options->pubkey_authentication = -1; | |
953 | options->challenge_response_authentication = -1; | |
954 | options->gss_authentication = -1; | |
955 | options->gss_deleg_creds = -1; | |
956 | options->password_authentication = -1; | |
957 | options->kbd_interactive_authentication = -1; | |
958 | options->kbd_interactive_devices = NULL; | |
959 | options->rhosts_rsa_authentication = -1; | |
960 | options->hostbased_authentication = -1; | |
961 | options->batch_mode = -1; | |
962 | options->check_host_ip = -1; | |
963 | options->strict_host_key_checking = -1; | |
964 | options->compression = -1; | |
965 | options->tcp_keep_alive = -1; | |
966 | options->compression_level = -1; | |
967 | options->port = -1; | |
968 | options->address_family = -1; | |
969 | options->connection_attempts = -1; | |
970 | options->connection_timeout = -1; | |
971 | options->number_of_password_prompts = -1; | |
972 | options->cipher = -1; | |
973 | options->ciphers = NULL; | |
974 | options->macs = NULL; | |
975 | options->hostkeyalgorithms = NULL; | |
976 | options->protocol = SSH_PROTO_UNKNOWN; | |
977 | options->num_identity_files = 0; | |
978 | options->hostname = NULL; | |
979 | options->host_key_alias = NULL; | |
980 | options->proxy_command = NULL; | |
981 | options->user = NULL; | |
982 | options->escape_char = -1; | |
983 | options->system_hostfile = NULL; | |
984 | options->user_hostfile = NULL; | |
985 | options->system_hostfile2 = NULL; | |
986 | options->user_hostfile2 = NULL; | |
987 | options->num_local_forwards = 0; | |
988 | options->num_remote_forwards = 0; | |
989 | options->clear_forwardings = -1; | |
990 | options->log_level = SYSLOG_LEVEL_NOT_SET; | |
991 | options->preferred_authentications = NULL; | |
992 | options->bind_address = NULL; | |
993 | options->smartcard_device = NULL; | |
994 | options->enable_ssh_keysign = - 1; | |
995 | options->no_host_authentication_for_localhost = - 1; | |
996 | options->identities_only = - 1; | |
997 | options->rekey_limit = - 1; | |
998 | options->verify_host_key_dns = -1; | |
999 | options->server_alive_interval = -1; | |
1000 | options->server_alive_count_max = -1; | |
1001 | options->num_send_env = 0; | |
1002 | options->control_path = NULL; | |
1003 | options->control_master = -1; | |
1004 | options->hash_known_hosts = -1; | |
1005 | options->tun_open = -1; | |
1006 | options->tun_local = -1; | |
1007 | options->tun_remote = -1; | |
1008 | options->local_command = NULL; | |
1009 | options->permit_local_command = -1; | |
1010 | } | |
1011 | ||
1012 | /* | |
1013 | * Called after processing other sources of option data, this fills those | |
1014 | * options for which no value has been specified with their default values. | |
1015 | */ | |
1016 | ||
1017 | void | |
1018 | fill_default_options(Options * options) | |
1019 | { | |
1020 | int len; | |
1021 | ||
1022 | if (options->forward_agent == -1) | |
1023 | options->forward_agent = 0; | |
1024 | if (options->forward_x11 == -1) | |
1025 | options->forward_x11 = 0; | |
1026 | if (options->forward_x11_trusted == -1) | |
1027 | options->forward_x11_trusted = 0; | |
1028 | if (options->xauth_location == NULL) | |
1029 | options->xauth_location = _PATH_XAUTH; | |
1030 | if (options->gateway_ports == -1) | |
1031 | options->gateway_ports = 0; | |
1032 | if (options->use_privileged_port == -1) | |
1033 | options->use_privileged_port = 0; | |
1034 | if (options->rsa_authentication == -1) | |
1035 | options->rsa_authentication = 1; | |
1036 | if (options->pubkey_authentication == -1) | |
1037 | options->pubkey_authentication = 1; | |
1038 | if (options->challenge_response_authentication == -1) | |
1039 | options->challenge_response_authentication = 1; | |
1040 | if (options->gss_authentication == -1) | |
1041 | options->gss_authentication = 0; | |
1042 | if (options->gss_deleg_creds == -1) | |
1043 | options->gss_deleg_creds = 0; | |
1044 | if (options->password_authentication == -1) | |
1045 | options->password_authentication = 1; | |
1046 | if (options->kbd_interactive_authentication == -1) | |
1047 | options->kbd_interactive_authentication = 1; | |
1048 | if (options->rhosts_rsa_authentication == -1) | |
1049 | options->rhosts_rsa_authentication = 0; | |
1050 | if (options->hostbased_authentication == -1) | |
1051 | options->hostbased_authentication = 0; | |
1052 | if (options->batch_mode == -1) | |
1053 | options->batch_mode = 0; | |
1054 | if (options->check_host_ip == -1) | |
1055 | options->check_host_ip = 1; | |
1056 | if (options->strict_host_key_checking == -1) | |
1057 | options->strict_host_key_checking = 2; /* 2 is default */ | |
1058 | if (options->compression == -1) | |
1059 | options->compression = 0; | |
1060 | if (options->tcp_keep_alive == -1) | |
1061 | options->tcp_keep_alive = 1; | |
1062 | if (options->compression_level == -1) | |
1063 | options->compression_level = 6; | |
1064 | if (options->port == -1) | |
1065 | options->port = 0; /* Filled in ssh_connect. */ | |
1066 | if (options->address_family == -1) | |
1067 | options->address_family = AF_UNSPEC; | |
1068 | if (options->connection_attempts == -1) | |
1069 | options->connection_attempts = 1; | |
1070 | if (options->number_of_password_prompts == -1) | |
1071 | options->number_of_password_prompts = 3; | |
1072 | /* Selected in ssh_login(). */ | |
1073 | if (options->cipher == -1) | |
1074 | options->cipher = SSH_CIPHER_NOT_SET; | |
1075 | /* options->ciphers, default set in myproposals.h */ | |
1076 | /* options->macs, default set in myproposals.h */ | |
1077 | /* options->hostkeyalgorithms, default set in myproposals.h */ | |
1078 | if (options->protocol == SSH_PROTO_UNKNOWN) | |
1079 | options->protocol = SSH_PROTO_1|SSH_PROTO_2; | |
1080 | if (options->num_identity_files == 0) { | |
1081 | if (options->protocol & SSH_PROTO_1) { | |
1082 | len = 2 + strlen(_PATH_SSH_CLIENT_IDENTITY) + 1; | |
1083 | options->identity_files[options->num_identity_files] = | |
1084 | xmalloc(len); | |
1085 | snprintf(options->identity_files[options->num_identity_files++], | |
1086 | len, "~/%.100s", _PATH_SSH_CLIENT_IDENTITY); | |
1087 | } | |
1088 | if (options->protocol & SSH_PROTO_2) { | |
1089 | len = 2 + strlen(_PATH_SSH_CLIENT_ID_RSA) + 1; | |
1090 | options->identity_files[options->num_identity_files] = | |
1091 | xmalloc(len); | |
1092 | snprintf(options->identity_files[options->num_identity_files++], | |
1093 | len, "~/%.100s", _PATH_SSH_CLIENT_ID_RSA); | |
1094 | ||
1095 | len = 2 + strlen(_PATH_SSH_CLIENT_ID_DSA) + 1; | |
1096 | options->identity_files[options->num_identity_files] = | |
1097 | xmalloc(len); | |
1098 | snprintf(options->identity_files[options->num_identity_files++], | |
1099 | len, "~/%.100s", _PATH_SSH_CLIENT_ID_DSA); | |
1100 | } | |
1101 | } | |
1102 | if (options->escape_char == -1) | |
1103 | options->escape_char = '~'; | |
1104 | if (options->system_hostfile == NULL) | |
1105 | options->system_hostfile = _PATH_SSH_SYSTEM_HOSTFILE; | |
1106 | if (options->user_hostfile == NULL) | |
1107 | options->user_hostfile = _PATH_SSH_USER_HOSTFILE; | |
1108 | if (options->system_hostfile2 == NULL) | |
1109 | options->system_hostfile2 = _PATH_SSH_SYSTEM_HOSTFILE2; | |
1110 | if (options->user_hostfile2 == NULL) | |
1111 | options->user_hostfile2 = _PATH_SSH_USER_HOSTFILE2; | |
1112 | if (options->log_level == SYSLOG_LEVEL_NOT_SET) | |
1113 | options->log_level = SYSLOG_LEVEL_INFO; | |
1114 | if (options->clear_forwardings == 1) | |
1115 | clear_forwardings(options); | |
1116 | if (options->no_host_authentication_for_localhost == - 1) | |
1117 | options->no_host_authentication_for_localhost = 0; | |
1118 | if (options->identities_only == -1) | |
1119 | options->identities_only = 0; | |
1120 | if (options->enable_ssh_keysign == -1) | |
1121 | options->enable_ssh_keysign = 0; | |
1122 | if (options->rekey_limit == -1) | |
1123 | options->rekey_limit = 0; | |
1124 | if (options->verify_host_key_dns == -1) | |
1125 | options->verify_host_key_dns = 0; | |
1126 | if (options->server_alive_interval == -1) | |
1127 | options->server_alive_interval = 0; | |
1128 | if (options->server_alive_count_max == -1) | |
1129 | options->server_alive_count_max = 3; | |
1130 | if (options->control_master == -1) | |
1131 | options->control_master = 0; | |
1132 | if (options->hash_known_hosts == -1) | |
1133 | options->hash_known_hosts = 0; | |
1134 | if (options->tun_open == -1) | |
1135 | options->tun_open = 0; | |
1136 | if (options->permit_local_command == -1) | |
1137 | options->permit_local_command = 0; | |
1138 | /* options->local_command should not be set by default */ | |
1139 | /* options->proxy_command should not be set by default */ | |
1140 | /* options->user will be set in the main program if appropriate */ | |
1141 | /* options->hostname will be set in the main program if appropriate */ | |
1142 | /* options->host_key_alias should not be set by default */ | |
1143 | /* options->preferred_authentications will be set in ssh */ | |
1144 | } | |
1145 | ||
1146 | /* | |
1147 | * parse_forward | |
1148 | * parses a string containing a port forwarding specification of the form: | |
1149 | * [listenhost:]listenport:connecthost:connectport | |
1150 | * returns number of arguments parsed or zero on error | |
1151 | */ | |
1152 | int | |
1153 | parse_forward(Forward *fwd, const char *fwdspec) | |
1154 | { | |
1155 | int i; | |
1156 | char *p, *cp, *fwdarg[4]; | |
1157 | ||
1158 | memset(fwd, '\0', sizeof(*fwd)); | |
1159 | ||
1160 | cp = p = xstrdup(fwdspec); | |
1161 | ||
1162 | /* skip leading spaces */ | |
1163 | while (*cp && isspace(*cp)) | |
1164 | cp++; | |
1165 | ||
1166 | for (i = 0; i < 4; ++i) | |
1167 | if ((fwdarg[i] = hpdelim(&cp)) == NULL) | |
1168 | break; | |
1169 | ||
1170 | /* Check for trailing garbage in 4-arg case*/ | |
1171 | if (cp != NULL) | |
1172 | i = 0; /* failure */ | |
1173 | ||
1174 | switch (i) { | |
1175 | case 3: | |
1176 | fwd->listen_host = NULL; | |
1177 | fwd->listen_port = a2port(fwdarg[0]); | |
1178 | fwd->connect_host = xstrdup(cleanhostname(fwdarg[1])); | |
1179 | fwd->connect_port = a2port(fwdarg[2]); | |
1180 | break; | |
1181 | ||
1182 | case 4: | |
1183 | fwd->listen_host = xstrdup(cleanhostname(fwdarg[0])); | |
1184 | fwd->listen_port = a2port(fwdarg[1]); | |
1185 | fwd->connect_host = xstrdup(cleanhostname(fwdarg[2])); | |
1186 | fwd->connect_port = a2port(fwdarg[3]); | |
1187 | break; | |
1188 | default: | |
1189 | i = 0; /* failure */ | |
1190 | } | |
1191 | ||
1192 | xfree(p); | |
1193 | ||
1194 | if (fwd->listen_port == 0 && fwd->connect_port == 0) | |
1195 | goto fail_free; | |
1196 | ||
1197 | if (fwd->connect_host != NULL && | |
1198 | strlen(fwd->connect_host) >= NI_MAXHOST) | |
1199 | goto fail_free; | |
1200 | ||
1201 | return (i); | |
1202 | ||
1203 | fail_free: | |
1204 | if (fwd->connect_host != NULL) | |
1205 | xfree(fwd->connect_host); | |
1206 | if (fwd->listen_host != NULL) | |
1207 | xfree(fwd->listen_host); | |
1208 | return (0); | |
1209 | } |