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3c0ef626 | 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" | |
12408a1b | 15 | RCSID("$OpenBSD: readconf.c,v 1.127 2003/12/16 15:49:51 markus Exp $"); |
3c0ef626 | 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 | |
f5799ae1 | 44 | User foo |
3c0ef626 | 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 | |
3c0ef626 | 60 | PasswordAuthentication no |
61 | ||
62 | Host puukko.hut.fi | |
63 | User t35124p | |
64 | ProxyCommand ssh-proxy %h %p | |
65 | ||
66 | Host *.fr | |
f5799ae1 | 67 | PublicKeyAuthentication no |
3c0ef626 | 68 | |
69 | Host *.su | |
70 | Cipher none | |
71 | PasswordAuthentication no | |
72 | ||
73 | # Defaults for various options | |
74 | Host * | |
75 | ForwardAgent no | |
76 | ForwardX11 no | |
3c0ef626 | 77 | PasswordAuthentication yes |
78 | RSAAuthentication yes | |
79 | RhostsRSAAuthentication yes | |
3c0ef626 | 80 | StrictHostKeyChecking yes |
12408a1b | 81 | TcpKeepAlive no |
3c0ef626 | 82 | IdentityFile ~/.ssh/identity |
83 | Port 22 | |
84 | EscapeChar ~ | |
85 | ||
86 | */ | |
87 | ||
88 | /* Keyword tokens. */ | |
89 | ||
90 | typedef enum { | |
91 | oBadOption, | |
12408a1b | 92 | oForwardAgent, oForwardX11, oForwardX11Trusted, oGatewayPorts, |
f5799ae1 | 93 | oPasswordAuthentication, oRSAAuthentication, |
3c0ef626 | 94 | oChallengeResponseAuthentication, oXAuthLocation, |
3c0ef626 | 95 | oIdentityFile, oHostName, oPort, oCipher, oRemoteForward, oLocalForward, |
96 | oUser, oHost, oEscapeChar, oRhostsRSAAuthentication, oProxyCommand, | |
97 | oGlobalKnownHostsFile, oUserKnownHostsFile, oConnectionAttempts, | |
98 | oBatchMode, oCheckHostIP, oStrictHostKeyChecking, oCompression, | |
12408a1b | 99 | oCompressionLevel, oTCPKeepAlive, oNumberOfPasswordPrompts, |
3c0ef626 | 100 | oUsePrivilegedPort, oLogLevel, oCiphers, oProtocol, oMacs, |
101 | oGlobalKnownHostsFile2, oUserKnownHostsFile2, oPubkeyAuthentication, | |
102 | oKbdInteractiveAuthentication, oKbdInteractiveDevices, oHostKeyAlias, | |
103 | oDynamicForward, oPreferredAuthentications, oHostbasedAuthentication, | |
104 | oHostKeyAlgorithms, oBindAddress, oSmartcardDevice, | |
f5799ae1 | 105 | oClearAllForwardings, oNoHostAuthenticationForLocalhost, |
0fff78ff | 106 | oEnableSSHKeysign, oRekeyLimit, oVerifyHostKeyDNS, oConnectTimeout, |
107 | oAddressFamily, oGssAuthentication, oGssDelegateCreds, | |
12408a1b | 108 | oServerAliveInterval, oServerAliveCountMax, |
0fff78ff | 109 | oDeprecated, oUnsupported |
3c0ef626 | 110 | } OpCodes; |
111 | ||
112 | /* Textual representations of the tokens. */ | |
113 | ||
114 | static struct { | |
115 | const char *name; | |
116 | OpCodes opcode; | |
117 | } keywords[] = { | |
118 | { "forwardagent", oForwardAgent }, | |
119 | { "forwardx11", oForwardX11 }, | |
12408a1b | 120 | { "forwardx11trusted", oForwardX11Trusted }, |
3c0ef626 | 121 | { "xauthlocation", oXAuthLocation }, |
122 | { "gatewayports", oGatewayPorts }, | |
123 | { "useprivilegedport", oUsePrivilegedPort }, | |
0fff78ff | 124 | { "rhostsauthentication", oDeprecated }, |
3c0ef626 | 125 | { "passwordauthentication", oPasswordAuthentication }, |
126 | { "kbdinteractiveauthentication", oKbdInteractiveAuthentication }, | |
127 | { "kbdinteractivedevices", oKbdInteractiveDevices }, | |
128 | { "rsaauthentication", oRSAAuthentication }, | |
129 | { "pubkeyauthentication", oPubkeyAuthentication }, | |
130 | { "dsaauthentication", oPubkeyAuthentication }, /* alias */ | |
131 | { "rhostsrsaauthentication", oRhostsRSAAuthentication }, | |
132 | { "hostbasedauthentication", oHostbasedAuthentication }, | |
133 | { "challengeresponseauthentication", oChallengeResponseAuthentication }, | |
134 | { "skeyauthentication", oChallengeResponseAuthentication }, /* alias */ | |
135 | { "tisauthentication", oChallengeResponseAuthentication }, /* alias */ | |
0fff78ff | 136 | { "kerberosauthentication", oUnsupported }, |
137 | { "kerberostgtpassing", oUnsupported }, | |
138 | { "afstokenpassing", oUnsupported }, | |
139 | #if defined(GSSAPI) | |
140 | { "gssapiauthentication", oGssAuthentication }, | |
141 | { "gssapidelegatecredentials", oGssDelegateCreds }, | |
142 | #else | |
143 | { "gssapiauthentication", oUnsupported }, | |
144 | { "gssapidelegatecredentials", oUnsupported }, | |
3c0ef626 | 145 | #endif |
f5799ae1 | 146 | { "fallbacktorsh", oDeprecated }, |
147 | { "usersh", oDeprecated }, | |
3c0ef626 | 148 | { "identityfile", oIdentityFile }, |
149 | { "identityfile2", oIdentityFile }, /* alias */ | |
150 | { "hostname", oHostName }, | |
151 | { "hostkeyalias", oHostKeyAlias }, | |
152 | { "proxycommand", oProxyCommand }, | |
153 | { "port", oPort }, | |
154 | { "cipher", oCipher }, | |
155 | { "ciphers", oCiphers }, | |
156 | { "macs", oMacs }, | |
157 | { "protocol", oProtocol }, | |
158 | { "remoteforward", oRemoteForward }, | |
159 | { "localforward", oLocalForward }, | |
160 | { "user", oUser }, | |
161 | { "host", oHost }, | |
162 | { "escapechar", oEscapeChar }, | |
163 | { "globalknownhostsfile", oGlobalKnownHostsFile }, | |
164 | { "userknownhostsfile", oUserKnownHostsFile }, /* obsolete */ | |
165 | { "globalknownhostsfile2", oGlobalKnownHostsFile2 }, | |
166 | { "userknownhostsfile2", oUserKnownHostsFile2 }, /* obsolete */ | |
167 | { "connectionattempts", oConnectionAttempts }, | |
168 | { "batchmode", oBatchMode }, | |
169 | { "checkhostip", oCheckHostIP }, | |
170 | { "stricthostkeychecking", oStrictHostKeyChecking }, | |
171 | { "compression", oCompression }, | |
172 | { "compressionlevel", oCompressionLevel }, | |
12408a1b | 173 | { "tcpkeepalive", oTCPKeepAlive }, |
174 | { "keepalive", oTCPKeepAlive }, /* obsolete */ | |
3c0ef626 | 175 | { "numberofpasswordprompts", oNumberOfPasswordPrompts }, |
176 | { "loglevel", oLogLevel }, | |
177 | { "dynamicforward", oDynamicForward }, | |
178 | { "preferredauthentications", oPreferredAuthentications }, | |
179 | { "hostkeyalgorithms", oHostKeyAlgorithms }, | |
180 | { "bindaddress", oBindAddress }, | |
0fff78ff | 181 | #ifdef SMARTCARD |
3c0ef626 | 182 | { "smartcarddevice", oSmartcardDevice }, |
0fff78ff | 183 | #else |
184 | { "smartcarddevice", oUnsupported }, | |
185 | #endif | |
e9a17296 | 186 | { "clearallforwardings", oClearAllForwardings }, |
6a9b3198 | 187 | { "enablesshkeysign", oEnableSSHKeysign }, |
0fff78ff | 188 | { "verifyhostkeydns", oVerifyHostKeyDNS }, |
e9a17296 | 189 | { "nohostauthenticationforlocalhost", oNoHostAuthenticationForLocalhost }, |
0fff78ff | 190 | { "rekeylimit", oRekeyLimit }, |
191 | { "connecttimeout", oConnectTimeout }, | |
192 | { "addressfamily", oAddressFamily }, | |
12408a1b | 193 | { "serveraliveinterval", oServerAliveInterval }, |
194 | { "serveralivecountmax", oServerAliveCountMax }, | |
e9a17296 | 195 | { NULL, oBadOption } |
3c0ef626 | 196 | }; |
197 | ||
198 | /* | |
199 | * Adds a local TCP/IP port forward to options. Never returns if there is an | |
200 | * error. | |
201 | */ | |
202 | ||
203 | void | |
204 | add_local_forward(Options *options, u_short port, const char *host, | |
205 | u_short host_port) | |
206 | { | |
207 | Forward *fwd; | |
41b2f314 | 208 | #ifndef NO_IPPORT_RESERVED_CONCEPT |
3c0ef626 | 209 | extern uid_t original_real_uid; |
210 | if (port < IPPORT_RESERVED && original_real_uid != 0) | |
211 | fatal("Privileged ports can only be forwarded by root."); | |
212 | #endif | |
213 | if (options->num_local_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
214 | fatal("Too many local forwards (max %d).", SSH_MAX_FORWARDS_PER_DIRECTION); | |
215 | fwd = &options->local_forwards[options->num_local_forwards++]; | |
216 | fwd->port = port; | |
217 | fwd->host = xstrdup(host); | |
218 | fwd->host_port = host_port; | |
219 | } | |
220 | ||
221 | /* | |
222 | * Adds a remote TCP/IP port forward to options. Never returns if there is | |
223 | * an error. | |
224 | */ | |
225 | ||
226 | void | |
227 | add_remote_forward(Options *options, u_short port, const char *host, | |
228 | u_short host_port) | |
229 | { | |
230 | Forward *fwd; | |
231 | if (options->num_remote_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
232 | fatal("Too many remote forwards (max %d).", | |
e9a17296 | 233 | SSH_MAX_FORWARDS_PER_DIRECTION); |
3c0ef626 | 234 | fwd = &options->remote_forwards[options->num_remote_forwards++]; |
235 | fwd->port = port; | |
236 | fwd->host = xstrdup(host); | |
237 | fwd->host_port = host_port; | |
238 | } | |
239 | ||
240 | static void | |
241 | clear_forwardings(Options *options) | |
242 | { | |
243 | int i; | |
244 | ||
245 | for (i = 0; i < options->num_local_forwards; i++) | |
246 | xfree(options->local_forwards[i].host); | |
247 | options->num_local_forwards = 0; | |
248 | for (i = 0; i < options->num_remote_forwards; i++) | |
249 | xfree(options->remote_forwards[i].host); | |
250 | options->num_remote_forwards = 0; | |
251 | } | |
252 | ||
253 | /* | |
254 | * Returns the number of the token pointed to by cp or oBadOption. | |
255 | */ | |
256 | ||
257 | static OpCodes | |
258 | parse_token(const char *cp, const char *filename, int linenum) | |
259 | { | |
260 | u_int i; | |
261 | ||
262 | for (i = 0; keywords[i].name; i++) | |
263 | if (strcasecmp(cp, keywords[i].name) == 0) | |
264 | return keywords[i].opcode; | |
265 | ||
266 | error("%s: line %d: Bad configuration option: %s", | |
267 | filename, linenum, cp); | |
268 | return oBadOption; | |
269 | } | |
270 | ||
271 | /* | |
272 | * Processes a single option line as used in the configuration files. This | |
273 | * only sets those values that have not already been set. | |
274 | */ | |
6a9b3198 | 275 | #define WHITESPACE " \t\r\n" |
3c0ef626 | 276 | |
277 | int | |
278 | process_config_line(Options *options, const char *host, | |
279 | char *line, const char *filename, int linenum, | |
280 | int *activep) | |
281 | { | |
6a9b3198 | 282 | char buf[256], *s, **charptr, *endofnumber, *keyword, *arg; |
3c0ef626 | 283 | int opcode, *intptr, value; |
6a9b3198 | 284 | size_t len; |
3c0ef626 | 285 | u_short fwd_port, fwd_host_port; |
286 | char sfwd_host_port[6]; | |
287 | ||
0fff78ff | 288 | /* Strip trailing whitespace */ |
289 | for(len = strlen(line) - 1; len > 0; len--) { | |
290 | if (strchr(WHITESPACE, line[len]) == NULL) | |
291 | break; | |
292 | line[len] = '\0'; | |
293 | } | |
294 | ||
3c0ef626 | 295 | s = line; |
296 | /* Get the keyword. (Each line is supposed to begin with a keyword). */ | |
297 | keyword = strdelim(&s); | |
298 | /* Ignore leading whitespace. */ | |
299 | if (*keyword == '\0') | |
300 | keyword = strdelim(&s); | |
301 | if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#') | |
302 | return 0; | |
303 | ||
304 | opcode = parse_token(keyword, filename, linenum); | |
305 | ||
306 | switch (opcode) { | |
307 | case oBadOption: | |
308 | /* don't panic, but count bad options */ | |
309 | return -1; | |
310 | /* NOTREACHED */ | |
0fff78ff | 311 | case oConnectTimeout: |
312 | intptr = &options->connection_timeout; | |
12408a1b | 313 | parse_time: |
0fff78ff | 314 | arg = strdelim(&s); |
315 | if (!arg || *arg == '\0') | |
316 | fatal("%s line %d: missing time value.", | |
317 | filename, linenum); | |
318 | if ((value = convtime(arg)) == -1) | |
319 | fatal("%s line %d: invalid time value.", | |
320 | filename, linenum); | |
321 | if (*intptr == -1) | |
322 | *intptr = value; | |
323 | break; | |
324 | ||
3c0ef626 | 325 | case oForwardAgent: |
326 | intptr = &options->forward_agent; | |
327 | parse_flag: | |
328 | arg = strdelim(&s); | |
329 | if (!arg || *arg == '\0') | |
330 | fatal("%.200s line %d: Missing yes/no argument.", filename, linenum); | |
331 | value = 0; /* To avoid compiler warning... */ | |
332 | if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0) | |
333 | value = 1; | |
334 | else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0) | |
335 | value = 0; | |
336 | else | |
337 | fatal("%.200s line %d: Bad yes/no argument.", filename, linenum); | |
338 | if (*activep && *intptr == -1) | |
339 | *intptr = value; | |
340 | break; | |
341 | ||
342 | case oForwardX11: | |
343 | intptr = &options->forward_x11; | |
344 | goto parse_flag; | |
345 | ||
12408a1b | 346 | case oForwardX11Trusted: |
347 | intptr = &options->forward_x11_trusted; | |
348 | goto parse_flag; | |
349 | ||
3c0ef626 | 350 | case oGatewayPorts: |
351 | intptr = &options->gateway_ports; | |
352 | goto parse_flag; | |
353 | ||
354 | case oUsePrivilegedPort: | |
355 | intptr = &options->use_privileged_port; | |
356 | goto parse_flag; | |
357 | ||
3c0ef626 | 358 | case oPasswordAuthentication: |
359 | intptr = &options->password_authentication; | |
360 | goto parse_flag; | |
361 | ||
362 | case oKbdInteractiveAuthentication: | |
363 | intptr = &options->kbd_interactive_authentication; | |
364 | goto parse_flag; | |
365 | ||
366 | case oKbdInteractiveDevices: | |
367 | charptr = &options->kbd_interactive_devices; | |
368 | goto parse_string; | |
369 | ||
370 | case oPubkeyAuthentication: | |
371 | intptr = &options->pubkey_authentication; | |
372 | goto parse_flag; | |
373 | ||
374 | case oRSAAuthentication: | |
375 | intptr = &options->rsa_authentication; | |
376 | goto parse_flag; | |
377 | ||
378 | case oRhostsRSAAuthentication: | |
379 | intptr = &options->rhosts_rsa_authentication; | |
380 | goto parse_flag; | |
381 | ||
382 | case oHostbasedAuthentication: | |
383 | intptr = &options->hostbased_authentication; | |
384 | goto parse_flag; | |
385 | ||
386 | case oChallengeResponseAuthentication: | |
387 | intptr = &options->challenge_response_authentication; | |
388 | goto parse_flag; | |
0fff78ff | 389 | |
390 | case oGssAuthentication: | |
391 | intptr = &options->gss_authentication; | |
3c0ef626 | 392 | goto parse_flag; |
0fff78ff | 393 | |
394 | case oGssDelegateCreds: | |
395 | intptr = &options->gss_deleg_creds; | |
3c0ef626 | 396 | goto parse_flag; |
0fff78ff | 397 | |
3c0ef626 | 398 | case oBatchMode: |
399 | intptr = &options->batch_mode; | |
400 | goto parse_flag; | |
401 | ||
402 | case oCheckHostIP: | |
403 | intptr = &options->check_host_ip; | |
404 | goto parse_flag; | |
405 | ||
0fff78ff | 406 | case oVerifyHostKeyDNS: |
407 | intptr = &options->verify_host_key_dns; | |
12408a1b | 408 | goto parse_yesnoask; |
0fff78ff | 409 | |
3c0ef626 | 410 | case oStrictHostKeyChecking: |
411 | intptr = &options->strict_host_key_checking; | |
12408a1b | 412 | parse_yesnoask: |
3c0ef626 | 413 | arg = strdelim(&s); |
414 | if (!arg || *arg == '\0') | |
415 | fatal("%.200s line %d: Missing yes/no/ask argument.", | |
e9a17296 | 416 | filename, linenum); |
3c0ef626 | 417 | value = 0; /* To avoid compiler warning... */ |
418 | if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0) | |
419 | value = 1; | |
420 | else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0) | |
421 | value = 0; | |
422 | else if (strcmp(arg, "ask") == 0) | |
423 | value = 2; | |
424 | else | |
425 | fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum); | |
426 | if (*activep && *intptr == -1) | |
427 | *intptr = value; | |
428 | break; | |
429 | ||
430 | case oCompression: | |
431 | intptr = &options->compression; | |
432 | goto parse_flag; | |
433 | ||
12408a1b | 434 | case oTCPKeepAlive: |
435 | intptr = &options->tcp_keep_alive; | |
3c0ef626 | 436 | goto parse_flag; |
437 | ||
438 | case oNoHostAuthenticationForLocalhost: | |
439 | intptr = &options->no_host_authentication_for_localhost; | |
440 | goto parse_flag; | |
441 | ||
442 | case oNumberOfPasswordPrompts: | |
443 | intptr = &options->number_of_password_prompts; | |
444 | goto parse_int; | |
445 | ||
446 | case oCompressionLevel: | |
447 | intptr = &options->compression_level; | |
448 | goto parse_int; | |
449 | ||
0fff78ff | 450 | case oRekeyLimit: |
451 | intptr = &options->rekey_limit; | |
452 | arg = strdelim(&s); | |
453 | if (!arg || *arg == '\0') | |
454 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
455 | if (arg[0] < '0' || arg[0] > '9') | |
456 | fatal("%.200s line %d: Bad number.", filename, linenum); | |
457 | value = strtol(arg, &endofnumber, 10); | |
458 | if (arg == endofnumber) | |
459 | fatal("%.200s line %d: Bad number.", filename, linenum); | |
460 | switch (toupper(*endofnumber)) { | |
461 | case 'K': | |
462 | value *= 1<<10; | |
463 | break; | |
464 | case 'M': | |
465 | value *= 1<<20; | |
466 | break; | |
467 | case 'G': | |
468 | value *= 1<<30; | |
469 | break; | |
470 | } | |
471 | if (*activep && *intptr == -1) | |
472 | *intptr = value; | |
473 | break; | |
474 | ||
3c0ef626 | 475 | case oIdentityFile: |
476 | arg = strdelim(&s); | |
477 | if (!arg || *arg == '\0') | |
478 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
479 | if (*activep) { | |
480 | intptr = &options->num_identity_files; | |
481 | if (*intptr >= SSH_MAX_IDENTITY_FILES) | |
482 | fatal("%.200s line %d: Too many identity files specified (max %d).", | |
e9a17296 | 483 | filename, linenum, SSH_MAX_IDENTITY_FILES); |
3c0ef626 | 484 | charptr = &options->identity_files[*intptr]; |
485 | *charptr = xstrdup(arg); | |
486 | *intptr = *intptr + 1; | |
487 | } | |
488 | break; | |
489 | ||
490 | case oXAuthLocation: | |
491 | charptr=&options->xauth_location; | |
492 | goto parse_string; | |
493 | ||
494 | case oUser: | |
495 | charptr = &options->user; | |
496 | parse_string: | |
497 | arg = strdelim(&s); | |
498 | if (!arg || *arg == '\0') | |
499 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
500 | if (*activep && *charptr == NULL) | |
501 | *charptr = xstrdup(arg); | |
502 | break; | |
503 | ||
504 | case oGlobalKnownHostsFile: | |
505 | charptr = &options->system_hostfile; | |
506 | goto parse_string; | |
507 | ||
508 | case oUserKnownHostsFile: | |
509 | charptr = &options->user_hostfile; | |
510 | goto parse_string; | |
511 | ||
512 | case oGlobalKnownHostsFile2: | |
513 | charptr = &options->system_hostfile2; | |
514 | goto parse_string; | |
515 | ||
516 | case oUserKnownHostsFile2: | |
517 | charptr = &options->user_hostfile2; | |
518 | goto parse_string; | |
519 | ||
520 | case oHostName: | |
521 | charptr = &options->hostname; | |
522 | goto parse_string; | |
523 | ||
524 | case oHostKeyAlias: | |
525 | charptr = &options->host_key_alias; | |
526 | goto parse_string; | |
527 | ||
528 | case oPreferredAuthentications: | |
529 | charptr = &options->preferred_authentications; | |
530 | goto parse_string; | |
531 | ||
532 | case oBindAddress: | |
533 | charptr = &options->bind_address; | |
534 | goto parse_string; | |
535 | ||
536 | case oSmartcardDevice: | |
537 | charptr = &options->smartcard_device; | |
538 | goto parse_string; | |
539 | ||
540 | case oProxyCommand: | |
0fff78ff | 541 | if (s == NULL) |
542 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
3c0ef626 | 543 | charptr = &options->proxy_command; |
6a9b3198 | 544 | len = strspn(s, WHITESPACE "="); |
3c0ef626 | 545 | if (*activep && *charptr == NULL) |
6a9b3198 | 546 | *charptr = xstrdup(s + len); |
3c0ef626 | 547 | return 0; |
548 | ||
549 | case oPort: | |
550 | intptr = &options->port; | |
551 | parse_int: | |
552 | arg = strdelim(&s); | |
553 | if (!arg || *arg == '\0') | |
554 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
555 | if (arg[0] < '0' || arg[0] > '9') | |
556 | fatal("%.200s line %d: Bad number.", filename, linenum); | |
557 | ||
558 | /* Octal, decimal, or hex format? */ | |
559 | value = strtol(arg, &endofnumber, 0); | |
560 | if (arg == endofnumber) | |
561 | fatal("%.200s line %d: Bad number.", filename, linenum); | |
562 | if (*activep && *intptr == -1) | |
563 | *intptr = value; | |
564 | break; | |
565 | ||
566 | case oConnectionAttempts: | |
567 | intptr = &options->connection_attempts; | |
568 | goto parse_int; | |
569 | ||
570 | case oCipher: | |
571 | intptr = &options->cipher; | |
572 | arg = strdelim(&s); | |
573 | if (!arg || *arg == '\0') | |
574 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
575 | value = cipher_number(arg); | |
576 | if (value == -1) | |
577 | fatal("%.200s line %d: Bad cipher '%s'.", | |
e9a17296 | 578 | filename, linenum, arg ? arg : "<NONE>"); |
3c0ef626 | 579 | if (*activep && *intptr == -1) |
580 | *intptr = value; | |
581 | break; | |
582 | ||
583 | case oCiphers: | |
584 | arg = strdelim(&s); | |
585 | if (!arg || *arg == '\0') | |
586 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
587 | if (!ciphers_valid(arg)) | |
588 | fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.", | |
e9a17296 | 589 | filename, linenum, arg ? arg : "<NONE>"); |
3c0ef626 | 590 | if (*activep && options->ciphers == NULL) |
591 | options->ciphers = xstrdup(arg); | |
592 | break; | |
593 | ||
594 | case oMacs: | |
595 | arg = strdelim(&s); | |
596 | if (!arg || *arg == '\0') | |
597 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
598 | if (!mac_valid(arg)) | |
599 | fatal("%.200s line %d: Bad SSH2 Mac spec '%s'.", | |
e9a17296 | 600 | filename, linenum, arg ? arg : "<NONE>"); |
3c0ef626 | 601 | if (*activep && options->macs == NULL) |
602 | options->macs = xstrdup(arg); | |
603 | break; | |
604 | ||
605 | case oHostKeyAlgorithms: | |
606 | arg = strdelim(&s); | |
607 | if (!arg || *arg == '\0') | |
608 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
609 | if (!key_names_valid2(arg)) | |
610 | fatal("%.200s line %d: Bad protocol 2 host key algorithms '%s'.", | |
e9a17296 | 611 | filename, linenum, arg ? arg : "<NONE>"); |
3c0ef626 | 612 | if (*activep && options->hostkeyalgorithms == NULL) |
613 | options->hostkeyalgorithms = xstrdup(arg); | |
614 | break; | |
615 | ||
616 | case oProtocol: | |
617 | intptr = &options->protocol; | |
618 | arg = strdelim(&s); | |
619 | if (!arg || *arg == '\0') | |
620 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
621 | value = proto_spec(arg); | |
622 | if (value == SSH_PROTO_UNKNOWN) | |
623 | fatal("%.200s line %d: Bad protocol spec '%s'.", | |
e9a17296 | 624 | filename, linenum, arg ? arg : "<NONE>"); |
3c0ef626 | 625 | if (*activep && *intptr == SSH_PROTO_UNKNOWN) |
626 | *intptr = value; | |
627 | break; | |
628 | ||
629 | case oLogLevel: | |
630 | intptr = (int *) &options->log_level; | |
631 | arg = strdelim(&s); | |
632 | value = log_level_number(arg); | |
e9a17296 | 633 | if (value == SYSLOG_LEVEL_NOT_SET) |
3c0ef626 | 634 | fatal("%.200s line %d: unsupported log level '%s'", |
e9a17296 | 635 | filename, linenum, arg ? arg : "<NONE>"); |
636 | if (*activep && (LogLevel) *intptr == SYSLOG_LEVEL_NOT_SET) | |
3c0ef626 | 637 | *intptr = (LogLevel) value; |
638 | break; | |
639 | ||
640 | case oLocalForward: | |
641 | case oRemoteForward: | |
642 | arg = strdelim(&s); | |
643 | if (!arg || *arg == '\0') | |
644 | fatal("%.200s line %d: Missing port argument.", | |
645 | filename, linenum); | |
646 | if ((fwd_port = a2port(arg)) == 0) | |
647 | fatal("%.200s line %d: Bad listen port.", | |
648 | filename, linenum); | |
649 | arg = strdelim(&s); | |
650 | if (!arg || *arg == '\0') | |
651 | fatal("%.200s line %d: Missing second argument.", | |
652 | filename, linenum); | |
653 | if (sscanf(arg, "%255[^:]:%5[0-9]", buf, sfwd_host_port) != 2 && | |
654 | sscanf(arg, "%255[^/]/%5[0-9]", buf, sfwd_host_port) != 2) | |
655 | fatal("%.200s line %d: Bad forwarding specification.", | |
656 | filename, linenum); | |
657 | if ((fwd_host_port = a2port(sfwd_host_port)) == 0) | |
658 | fatal("%.200s line %d: Bad forwarding port.", | |
659 | filename, linenum); | |
660 | if (*activep) { | |
661 | if (opcode == oLocalForward) | |
662 | add_local_forward(options, fwd_port, buf, | |
663 | fwd_host_port); | |
664 | else if (opcode == oRemoteForward) | |
665 | add_remote_forward(options, fwd_port, buf, | |
666 | fwd_host_port); | |
667 | } | |
668 | break; | |
669 | ||
670 | case oDynamicForward: | |
671 | arg = strdelim(&s); | |
672 | if (!arg || *arg == '\0') | |
673 | fatal("%.200s line %d: Missing port argument.", | |
674 | filename, linenum); | |
675 | fwd_port = a2port(arg); | |
676 | if (fwd_port == 0) | |
677 | fatal("%.200s line %d: Badly formatted port number.", | |
678 | filename, linenum); | |
679 | if (*activep) | |
0fff78ff | 680 | add_local_forward(options, fwd_port, "socks", 0); |
3c0ef626 | 681 | break; |
682 | ||
683 | case oClearAllForwardings: | |
684 | intptr = &options->clear_forwardings; | |
685 | goto parse_flag; | |
686 | ||
687 | case oHost: | |
688 | *activep = 0; | |
689 | while ((arg = strdelim(&s)) != NULL && *arg != '\0') | |
690 | if (match_pattern(host, arg)) { | |
691 | debug("Applying options for %.100s", arg); | |
692 | *activep = 1; | |
693 | break; | |
694 | } | |
695 | /* Avoid garbage check below, as strdelim is done. */ | |
696 | return 0; | |
697 | ||
698 | case oEscapeChar: | |
699 | intptr = &options->escape_char; | |
700 | arg = strdelim(&s); | |
701 | if (!arg || *arg == '\0') | |
702 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
703 | if (arg[0] == '^' && arg[2] == 0 && | |
704 | (u_char) arg[1] >= 64 && (u_char) arg[1] < 128) | |
705 | value = (u_char) arg[1] & 31; | |
706 | else if (strlen(arg) == 1) | |
707 | value = (u_char) arg[0]; | |
708 | else if (strcmp(arg, "none") == 0) | |
709 | value = SSH_ESCAPECHAR_NONE; | |
710 | else { | |
711 | fatal("%.200s line %d: Bad escape character.", | |
e9a17296 | 712 | filename, linenum); |
3c0ef626 | 713 | /* NOTREACHED */ |
714 | value = 0; /* Avoid compiler warning. */ | |
715 | } | |
716 | if (*activep && *intptr == -1) | |
717 | *intptr = value; | |
718 | break; | |
719 | ||
0fff78ff | 720 | case oAddressFamily: |
721 | arg = strdelim(&s); | |
722 | intptr = &options->address_family; | |
723 | if (strcasecmp(arg, "inet") == 0) | |
724 | value = AF_INET; | |
725 | else if (strcasecmp(arg, "inet6") == 0) | |
726 | value = AF_INET6; | |
727 | else if (strcasecmp(arg, "any") == 0) | |
728 | value = AF_UNSPEC; | |
729 | else | |
730 | fatal("Unsupported AddressFamily \"%s\"", arg); | |
731 | if (*activep && *intptr == -1) | |
732 | *intptr = value; | |
733 | break; | |
734 | ||
6a9b3198 | 735 | case oEnableSSHKeysign: |
736 | intptr = &options->enable_ssh_keysign; | |
737 | goto parse_flag; | |
738 | ||
12408a1b | 739 | case oServerAliveInterval: |
740 | intptr = &options->server_alive_interval; | |
741 | goto parse_time; | |
742 | ||
743 | case oServerAliveCountMax: | |
744 | intptr = &options->server_alive_count_max; | |
745 | goto parse_int; | |
746 | ||
f5799ae1 | 747 | case oDeprecated: |
748 | debug("%s line %d: Deprecated option \"%s\"", | |
749 | filename, linenum, keyword); | |
750 | return 0; | |
751 | ||
0fff78ff | 752 | case oUnsupported: |
753 | error("%s line %d: Unsupported option \"%s\"", | |
754 | filename, linenum, keyword); | |
755 | return 0; | |
756 | ||
3c0ef626 | 757 | default: |
758 | fatal("process_config_line: Unimplemented opcode %d", opcode); | |
759 | } | |
760 | ||
761 | /* Check that there is no garbage at end of line. */ | |
762 | if ((arg = strdelim(&s)) != NULL && *arg != '\0') { | |
763 | fatal("%.200s line %d: garbage at end of line; \"%.200s\".", | |
e9a17296 | 764 | filename, linenum, arg); |
3c0ef626 | 765 | } |
766 | return 0; | |
767 | } | |
768 | ||
769 | ||
770 | /* | |
771 | * Reads the config file and modifies the options accordingly. Options | |
772 | * should already be initialized before this call. This never returns if | |
773 | * there is an error. If the file does not exist, this returns 0. | |
774 | */ | |
775 | ||
776 | int | |
777 | read_config_file(const char *filename, const char *host, Options *options) | |
778 | { | |
779 | FILE *f; | |
780 | char line[1024]; | |
781 | int active, linenum; | |
782 | int bad_options = 0; | |
783 | ||
784 | /* Open the file. */ | |
785 | f = fopen(filename, "r"); | |
786 | if (!f) | |
787 | return 0; | |
788 | ||
789 | debug("Reading configuration data %.200s", filename); | |
790 | ||
791 | /* | |
792 | * Mark that we are now processing the options. This flag is turned | |
793 | * on/off by Host specifications. | |
794 | */ | |
795 | active = 1; | |
796 | linenum = 0; | |
797 | while (fgets(line, sizeof(line), f)) { | |
798 | /* Update line number counter. */ | |
799 | linenum++; | |
800 | if (process_config_line(options, host, line, filename, linenum, &active) != 0) | |
801 | bad_options++; | |
802 | } | |
803 | fclose(f); | |
804 | if (bad_options > 0) | |
805 | fatal("%s: terminating, %d bad configuration options", | |
e9a17296 | 806 | filename, bad_options); |
3c0ef626 | 807 | return 1; |
808 | } | |
809 | ||
810 | /* | |
811 | * Initializes options to special values that indicate that they have not yet | |
812 | * been set. Read_config_file will only set options with this value. Options | |
813 | * are processed in the following order: command line, user config file, | |
814 | * system config file. Last, fill_default_options is called. | |
815 | */ | |
816 | ||
817 | void | |
818 | initialize_options(Options * options) | |
819 | { | |
820 | memset(options, 'X', sizeof(*options)); | |
821 | options->forward_agent = -1; | |
822 | options->forward_x11 = -1; | |
12408a1b | 823 | options->forward_x11_trusted = -1; |
3c0ef626 | 824 | options->xauth_location = NULL; |
825 | options->gateway_ports = -1; | |
826 | options->use_privileged_port = -1; | |
3c0ef626 | 827 | options->rsa_authentication = -1; |
828 | options->pubkey_authentication = -1; | |
829 | options->challenge_response_authentication = -1; | |
0fff78ff | 830 | options->gss_authentication = -1; |
831 | options->gss_deleg_creds = -1; | |
3c0ef626 | 832 | options->password_authentication = -1; |
833 | options->kbd_interactive_authentication = -1; | |
834 | options->kbd_interactive_devices = NULL; | |
835 | options->rhosts_rsa_authentication = -1; | |
836 | options->hostbased_authentication = -1; | |
3c0ef626 | 837 | options->batch_mode = -1; |
838 | options->check_host_ip = -1; | |
839 | options->strict_host_key_checking = -1; | |
840 | options->compression = -1; | |
12408a1b | 841 | options->tcp_keep_alive = -1; |
3c0ef626 | 842 | options->compression_level = -1; |
843 | options->port = -1; | |
0fff78ff | 844 | options->address_family = -1; |
3c0ef626 | 845 | options->connection_attempts = -1; |
0fff78ff | 846 | options->connection_timeout = -1; |
3c0ef626 | 847 | options->number_of_password_prompts = -1; |
848 | options->cipher = -1; | |
849 | options->ciphers = NULL; | |
850 | options->macs = NULL; | |
851 | options->hostkeyalgorithms = NULL; | |
852 | options->protocol = SSH_PROTO_UNKNOWN; | |
853 | options->num_identity_files = 0; | |
854 | options->hostname = NULL; | |
855 | options->host_key_alias = NULL; | |
856 | options->proxy_command = NULL; | |
857 | options->user = NULL; | |
858 | options->escape_char = -1; | |
859 | options->system_hostfile = NULL; | |
860 | options->user_hostfile = NULL; | |
861 | options->system_hostfile2 = NULL; | |
862 | options->user_hostfile2 = NULL; | |
863 | options->num_local_forwards = 0; | |
864 | options->num_remote_forwards = 0; | |
865 | options->clear_forwardings = -1; | |
e9a17296 | 866 | options->log_level = SYSLOG_LEVEL_NOT_SET; |
3c0ef626 | 867 | options->preferred_authentications = NULL; |
868 | options->bind_address = NULL; | |
869 | options->smartcard_device = NULL; | |
6a9b3198 | 870 | options->enable_ssh_keysign = - 1; |
3c0ef626 | 871 | options->no_host_authentication_for_localhost = - 1; |
0fff78ff | 872 | options->rekey_limit = - 1; |
873 | options->verify_host_key_dns = -1; | |
12408a1b | 874 | options->server_alive_interval = -1; |
875 | options->server_alive_count_max = -1; | |
3c0ef626 | 876 | } |
877 | ||
878 | /* | |
879 | * Called after processing other sources of option data, this fills those | |
880 | * options for which no value has been specified with their default values. | |
881 | */ | |
882 | ||
883 | void | |
884 | fill_default_options(Options * options) | |
885 | { | |
886 | int len; | |
887 | ||
888 | if (options->forward_agent == -1) | |
889 | options->forward_agent = 0; | |
890 | if (options->forward_x11 == -1) | |
891 | options->forward_x11 = 0; | |
12408a1b | 892 | if (options->forward_x11_trusted == -1) |
893 | options->forward_x11_trusted = 0; | |
3c0ef626 | 894 | if (options->xauth_location == NULL) |
895 | options->xauth_location = _PATH_XAUTH; | |
3c0ef626 | 896 | if (options->gateway_ports == -1) |
897 | options->gateway_ports = 0; | |
898 | if (options->use_privileged_port == -1) | |
899 | options->use_privileged_port = 0; | |
3c0ef626 | 900 | if (options->rsa_authentication == -1) |
901 | options->rsa_authentication = 1; | |
902 | if (options->pubkey_authentication == -1) | |
903 | options->pubkey_authentication = 1; | |
904 | if (options->challenge_response_authentication == -1) | |
905 | options->challenge_response_authentication = 1; | |
0fff78ff | 906 | if (options->gss_authentication == -1) |
12408a1b | 907 | options->gss_authentication = 0; |
0fff78ff | 908 | if (options->gss_deleg_creds == -1) |
909 | options->gss_deleg_creds = 0; | |
3c0ef626 | 910 | if (options->password_authentication == -1) |
911 | options->password_authentication = 1; | |
912 | if (options->kbd_interactive_authentication == -1) | |
913 | options->kbd_interactive_authentication = 1; | |
914 | if (options->rhosts_rsa_authentication == -1) | |
f5799ae1 | 915 | options->rhosts_rsa_authentication = 0; |
3c0ef626 | 916 | if (options->hostbased_authentication == -1) |
917 | options->hostbased_authentication = 0; | |
3c0ef626 | 918 | if (options->batch_mode == -1) |
919 | options->batch_mode = 0; | |
920 | if (options->check_host_ip == -1) | |
921 | options->check_host_ip = 1; | |
922 | if (options->strict_host_key_checking == -1) | |
923 | options->strict_host_key_checking = 2; /* 2 is default */ | |
924 | if (options->compression == -1) | |
925 | options->compression = 0; | |
12408a1b | 926 | if (options->tcp_keep_alive == -1) |
927 | options->tcp_keep_alive = 1; | |
3c0ef626 | 928 | if (options->compression_level == -1) |
929 | options->compression_level = 6; | |
930 | if (options->port == -1) | |
931 | options->port = 0; /* Filled in ssh_connect. */ | |
0fff78ff | 932 | if (options->address_family == -1) |
933 | options->address_family = AF_UNSPEC; | |
3c0ef626 | 934 | if (options->connection_attempts == -1) |
935 | options->connection_attempts = 1; | |
936 | if (options->number_of_password_prompts == -1) | |
937 | options->number_of_password_prompts = 3; | |
938 | /* Selected in ssh_login(). */ | |
939 | if (options->cipher == -1) | |
940 | options->cipher = SSH_CIPHER_NOT_SET; | |
941 | /* options->ciphers, default set in myproposals.h */ | |
942 | /* options->macs, default set in myproposals.h */ | |
943 | /* options->hostkeyalgorithms, default set in myproposals.h */ | |
944 | if (options->protocol == SSH_PROTO_UNKNOWN) | |
945 | options->protocol = SSH_PROTO_1|SSH_PROTO_2; | |
946 | if (options->num_identity_files == 0) { | |
947 | if (options->protocol & SSH_PROTO_1) { | |
948 | len = 2 + strlen(_PATH_SSH_CLIENT_IDENTITY) + 1; | |
949 | options->identity_files[options->num_identity_files] = | |
950 | xmalloc(len); | |
951 | snprintf(options->identity_files[options->num_identity_files++], | |
952 | len, "~/%.100s", _PATH_SSH_CLIENT_IDENTITY); | |
953 | } | |
954 | if (options->protocol & SSH_PROTO_2) { | |
955 | len = 2 + strlen(_PATH_SSH_CLIENT_ID_RSA) + 1; | |
956 | options->identity_files[options->num_identity_files] = | |
957 | xmalloc(len); | |
958 | snprintf(options->identity_files[options->num_identity_files++], | |
959 | len, "~/%.100s", _PATH_SSH_CLIENT_ID_RSA); | |
960 | ||
961 | len = 2 + strlen(_PATH_SSH_CLIENT_ID_DSA) + 1; | |
962 | options->identity_files[options->num_identity_files] = | |
963 | xmalloc(len); | |
964 | snprintf(options->identity_files[options->num_identity_files++], | |
965 | len, "~/%.100s", _PATH_SSH_CLIENT_ID_DSA); | |
966 | } | |
967 | } | |
968 | if (options->escape_char == -1) | |
969 | options->escape_char = '~'; | |
970 | if (options->system_hostfile == NULL) | |
971 | options->system_hostfile = _PATH_SSH_SYSTEM_HOSTFILE; | |
972 | if (options->user_hostfile == NULL) | |
973 | options->user_hostfile = _PATH_SSH_USER_HOSTFILE; | |
974 | if (options->system_hostfile2 == NULL) | |
975 | options->system_hostfile2 = _PATH_SSH_SYSTEM_HOSTFILE2; | |
976 | if (options->user_hostfile2 == NULL) | |
977 | options->user_hostfile2 = _PATH_SSH_USER_HOSTFILE2; | |
e9a17296 | 978 | if (options->log_level == SYSLOG_LEVEL_NOT_SET) |
3c0ef626 | 979 | options->log_level = SYSLOG_LEVEL_INFO; |
980 | if (options->clear_forwardings == 1) | |
981 | clear_forwardings(options); | |
982 | if (options->no_host_authentication_for_localhost == - 1) | |
983 | options->no_host_authentication_for_localhost = 0; | |
6a9b3198 | 984 | if (options->enable_ssh_keysign == -1) |
985 | options->enable_ssh_keysign = 0; | |
0fff78ff | 986 | if (options->rekey_limit == -1) |
987 | options->rekey_limit = 0; | |
988 | if (options->verify_host_key_dns == -1) | |
989 | options->verify_host_key_dns = 0; | |
12408a1b | 990 | if (options->server_alive_interval == -1) |
991 | options->server_alive_interval = 0; | |
992 | if (options->server_alive_count_max == -1) | |
993 | options->server_alive_count_max = 3; | |
3c0ef626 | 994 | /* options->proxy_command should not be set by default */ |
995 | /* options->user will be set in the main program if appropriate */ | |
996 | /* options->hostname will be set in the main program if appropriate */ | |
997 | /* options->host_key_alias should not be set by default */ | |
998 | /* options->preferred_authentications will be set in ssh */ | |
999 | } |