]>
Commit | Line | Data |
---|---|---|
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" | |
12a403af | 15 | RCSID("$OpenBSD: readconf.c,v 1.128 2004/03/05 10:53:58 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 | |
44a053a3 | 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 | |
44a053a3 | 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 |
540d72c3 | 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, | |
540d72c3 | 92 | oForwardAgent, oForwardX11, oForwardX11Trusted, oGatewayPorts, |
44a053a3 | 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, | |
540d72c3 | 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, | |
44a053a3 | 105 | oClearAllForwardings, oNoHostAuthenticationForLocalhost, |
7cac2b65 | 106 | oEnableSSHKeysign, oRekeyLimit, oVerifyHostKeyDNS, oConnectTimeout, |
107 | oAddressFamily, oGssAuthentication, oGssKeyEx, oGssDelegateCreds, | |
12a403af | 108 | oServerAliveInterval, oServerAliveCountMax, oIdentitiesOnly, |
7cac2b65 | 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 }, | |
540d72c3 | 120 | { "forwardx11trusted", oForwardX11Trusted }, |
3c0ef626 | 121 | { "xauthlocation", oXAuthLocation }, |
122 | { "gatewayports", oGatewayPorts }, | |
123 | { "useprivilegedport", oUsePrivilegedPort }, | |
7cac2b65 | 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 */ | |
7cac2b65 | 136 | { "kerberosauthentication", oUnsupported }, |
137 | { "kerberostgtpassing", oUnsupported }, | |
138 | { "afstokenpassing", oUnsupported }, | |
139 | #if defined(GSSAPI) | |
5598e598 | 140 | { "gssapiauthentication", oGssAuthentication }, |
7a056ed1 | 141 | { "gssapikeyexchange", oGssKeyEx }, |
5598e598 | 142 | { "gssapidelegatecredentials", oGssDelegateCreds }, |
7cac2b65 | 143 | #else |
144 | { "gssapiauthentication", oUnsupported }, | |
145 | { "gssapikeyexchange", oUnsupported }, | |
146 | { "gssapidelegatecredentials", oUnsupported }, | |
3c0ef626 | 147 | #endif |
44a053a3 | 148 | { "fallbacktorsh", oDeprecated }, |
149 | { "usersh", oDeprecated }, | |
3c0ef626 | 150 | { "identityfile", oIdentityFile }, |
151 | { "identityfile2", oIdentityFile }, /* alias */ | |
12a403af | 152 | { "identitiesonly", oIdentitiesOnly }, |
3c0ef626 | 153 | { "hostname", oHostName }, |
154 | { "hostkeyalias", oHostKeyAlias }, | |
155 | { "proxycommand", oProxyCommand }, | |
156 | { "port", oPort }, | |
157 | { "cipher", oCipher }, | |
158 | { "ciphers", oCiphers }, | |
159 | { "macs", oMacs }, | |
160 | { "protocol", oProtocol }, | |
161 | { "remoteforward", oRemoteForward }, | |
162 | { "localforward", oLocalForward }, | |
163 | { "user", oUser }, | |
164 | { "host", oHost }, | |
165 | { "escapechar", oEscapeChar }, | |
166 | { "globalknownhostsfile", oGlobalKnownHostsFile }, | |
167 | { "userknownhostsfile", oUserKnownHostsFile }, /* obsolete */ | |
168 | { "globalknownhostsfile2", oGlobalKnownHostsFile2 }, | |
169 | { "userknownhostsfile2", oUserKnownHostsFile2 }, /* obsolete */ | |
170 | { "connectionattempts", oConnectionAttempts }, | |
171 | { "batchmode", oBatchMode }, | |
172 | { "checkhostip", oCheckHostIP }, | |
173 | { "stricthostkeychecking", oStrictHostKeyChecking }, | |
174 | { "compression", oCompression }, | |
175 | { "compressionlevel", oCompressionLevel }, | |
540d72c3 | 176 | { "tcpkeepalive", oTCPKeepAlive }, |
177 | { "keepalive", oTCPKeepAlive }, /* obsolete */ | |
3c0ef626 | 178 | { "numberofpasswordprompts", oNumberOfPasswordPrompts }, |
179 | { "loglevel", oLogLevel }, | |
180 | { "dynamicforward", oDynamicForward }, | |
181 | { "preferredauthentications", oPreferredAuthentications }, | |
182 | { "hostkeyalgorithms", oHostKeyAlgorithms }, | |
183 | { "bindaddress", oBindAddress }, | |
7cac2b65 | 184 | #ifdef SMARTCARD |
3c0ef626 | 185 | { "smartcarddevice", oSmartcardDevice }, |
7cac2b65 | 186 | #else |
187 | { "smartcarddevice", oUnsupported }, | |
188 | #endif | |
e9702f7d | 189 | { "clearallforwardings", oClearAllForwardings }, |
bfe49944 | 190 | { "enablesshkeysign", oEnableSSHKeysign }, |
7cac2b65 | 191 | { "verifyhostkeydns", oVerifyHostKeyDNS }, |
e9702f7d | 192 | { "nohostauthenticationforlocalhost", oNoHostAuthenticationForLocalhost }, |
7cac2b65 | 193 | { "rekeylimit", oRekeyLimit }, |
194 | { "connecttimeout", oConnectTimeout }, | |
195 | { "addressfamily", oAddressFamily }, | |
540d72c3 | 196 | { "serveraliveinterval", oServerAliveInterval }, |
197 | { "serveralivecountmax", oServerAliveCountMax }, | |
e9702f7d | 198 | { NULL, oBadOption } |
3c0ef626 | 199 | }; |
200 | ||
201 | /* | |
202 | * Adds a local TCP/IP port forward to options. Never returns if there is an | |
203 | * error. | |
204 | */ | |
205 | ||
206 | void | |
207 | add_local_forward(Options *options, u_short port, const char *host, | |
208 | u_short host_port) | |
209 | { | |
210 | Forward *fwd; | |
d03f4262 | 211 | #ifndef NO_IPPORT_RESERVED_CONCEPT |
3c0ef626 | 212 | extern uid_t original_real_uid; |
213 | if (port < IPPORT_RESERVED && original_real_uid != 0) | |
214 | fatal("Privileged ports can only be forwarded by root."); | |
215 | #endif | |
216 | if (options->num_local_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
217 | fatal("Too many local forwards (max %d).", SSH_MAX_FORWARDS_PER_DIRECTION); | |
218 | fwd = &options->local_forwards[options->num_local_forwards++]; | |
219 | fwd->port = port; | |
220 | fwd->host = xstrdup(host); | |
221 | fwd->host_port = host_port; | |
222 | } | |
223 | ||
224 | /* | |
225 | * Adds a remote TCP/IP port forward to options. Never returns if there is | |
226 | * an error. | |
227 | */ | |
228 | ||
229 | void | |
230 | add_remote_forward(Options *options, u_short port, const char *host, | |
231 | u_short host_port) | |
232 | { | |
233 | Forward *fwd; | |
234 | if (options->num_remote_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
235 | fatal("Too many remote forwards (max %d).", | |
e9702f7d | 236 | SSH_MAX_FORWARDS_PER_DIRECTION); |
3c0ef626 | 237 | fwd = &options->remote_forwards[options->num_remote_forwards++]; |
238 | fwd->port = port; | |
239 | fwd->host = xstrdup(host); | |
240 | fwd->host_port = host_port; | |
241 | } | |
242 | ||
243 | static void | |
244 | clear_forwardings(Options *options) | |
245 | { | |
246 | int i; | |
247 | ||
248 | for (i = 0; i < options->num_local_forwards; i++) | |
249 | xfree(options->local_forwards[i].host); | |
250 | options->num_local_forwards = 0; | |
251 | for (i = 0; i < options->num_remote_forwards; i++) | |
252 | xfree(options->remote_forwards[i].host); | |
253 | options->num_remote_forwards = 0; | |
254 | } | |
255 | ||
256 | /* | |
257 | * Returns the number of the token pointed to by cp or oBadOption. | |
258 | */ | |
259 | ||
260 | static OpCodes | |
261 | parse_token(const char *cp, const char *filename, int linenum) | |
262 | { | |
263 | u_int i; | |
264 | ||
265 | for (i = 0; keywords[i].name; i++) | |
266 | if (strcasecmp(cp, keywords[i].name) == 0) | |
267 | return keywords[i].opcode; | |
268 | ||
269 | error("%s: line %d: Bad configuration option: %s", | |
270 | filename, linenum, cp); | |
271 | return oBadOption; | |
272 | } | |
273 | ||
274 | /* | |
275 | * Processes a single option line as used in the configuration files. This | |
276 | * only sets those values that have not already been set. | |
277 | */ | |
bfe49944 | 278 | #define WHITESPACE " \t\r\n" |
3c0ef626 | 279 | |
280 | int | |
281 | process_config_line(Options *options, const char *host, | |
282 | char *line, const char *filename, int linenum, | |
283 | int *activep) | |
284 | { | |
bfe49944 | 285 | char buf[256], *s, **charptr, *endofnumber, *keyword, *arg; |
3c0ef626 | 286 | int opcode, *intptr, value; |
bfe49944 | 287 | size_t len; |
3c0ef626 | 288 | u_short fwd_port, fwd_host_port; |
289 | char sfwd_host_port[6]; | |
290 | ||
7cac2b65 | 291 | /* Strip trailing whitespace */ |
292 | for(len = strlen(line) - 1; len > 0; len--) { | |
293 | if (strchr(WHITESPACE, line[len]) == NULL) | |
294 | break; | |
295 | line[len] = '\0'; | |
296 | } | |
297 | ||
3c0ef626 | 298 | s = line; |
299 | /* Get the keyword. (Each line is supposed to begin with a keyword). */ | |
300 | keyword = strdelim(&s); | |
301 | /* Ignore leading whitespace. */ | |
302 | if (*keyword == '\0') | |
303 | keyword = strdelim(&s); | |
304 | if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#') | |
305 | return 0; | |
306 | ||
307 | opcode = parse_token(keyword, filename, linenum); | |
308 | ||
309 | switch (opcode) { | |
310 | case oBadOption: | |
311 | /* don't panic, but count bad options */ | |
312 | return -1; | |
313 | /* NOTREACHED */ | |
7cac2b65 | 314 | case oConnectTimeout: |
315 | intptr = &options->connection_timeout; | |
540d72c3 | 316 | parse_time: |
7cac2b65 | 317 | arg = strdelim(&s); |
318 | if (!arg || *arg == '\0') | |
319 | fatal("%s line %d: missing time value.", | |
320 | filename, linenum); | |
321 | if ((value = convtime(arg)) == -1) | |
322 | fatal("%s line %d: invalid time value.", | |
323 | filename, linenum); | |
324 | if (*intptr == -1) | |
325 | *intptr = value; | |
326 | break; | |
327 | ||
3c0ef626 | 328 | case oForwardAgent: |
329 | intptr = &options->forward_agent; | |
330 | parse_flag: | |
331 | arg = strdelim(&s); | |
332 | if (!arg || *arg == '\0') | |
333 | fatal("%.200s line %d: Missing yes/no argument.", filename, linenum); | |
334 | value = 0; /* To avoid compiler warning... */ | |
335 | if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0) | |
336 | value = 1; | |
337 | else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0) | |
338 | value = 0; | |
339 | else | |
340 | fatal("%.200s line %d: Bad yes/no argument.", filename, linenum); | |
341 | if (*activep && *intptr == -1) | |
342 | *intptr = value; | |
343 | break; | |
344 | ||
345 | case oForwardX11: | |
346 | intptr = &options->forward_x11; | |
347 | goto parse_flag; | |
348 | ||
540d72c3 | 349 | case oForwardX11Trusted: |
350 | intptr = &options->forward_x11_trusted; | |
351 | goto parse_flag; | |
352 | ||
3c0ef626 | 353 | case oGatewayPorts: |
354 | intptr = &options->gateway_ports; | |
355 | goto parse_flag; | |
356 | ||
357 | case oUsePrivilegedPort: | |
358 | intptr = &options->use_privileged_port; | |
359 | goto parse_flag; | |
360 | ||
3c0ef626 | 361 | case oPasswordAuthentication: |
362 | intptr = &options->password_authentication; | |
363 | goto parse_flag; | |
364 | ||
365 | case oKbdInteractiveAuthentication: | |
366 | intptr = &options->kbd_interactive_authentication; | |
367 | goto parse_flag; | |
368 | ||
369 | case oKbdInteractiveDevices: | |
370 | charptr = &options->kbd_interactive_devices; | |
371 | goto parse_string; | |
372 | ||
373 | case oPubkeyAuthentication: | |
374 | intptr = &options->pubkey_authentication; | |
375 | goto parse_flag; | |
376 | ||
377 | case oRSAAuthentication: | |
378 | intptr = &options->rsa_authentication; | |
379 | goto parse_flag; | |
380 | ||
381 | case oRhostsRSAAuthentication: | |
382 | intptr = &options->rhosts_rsa_authentication; | |
383 | goto parse_flag; | |
384 | ||
385 | case oHostbasedAuthentication: | |
386 | intptr = &options->hostbased_authentication; | |
387 | goto parse_flag; | |
388 | ||
389 | case oChallengeResponseAuthentication: | |
390 | intptr = &options->challenge_response_authentication; | |
391 | goto parse_flag; | |
7cac2b65 | 392 | |
5598e598 | 393 | case oGssAuthentication: |
394 | intptr = &options->gss_authentication; | |
395 | goto parse_flag; | |
7cac2b65 | 396 | |
7a056ed1 | 397 | case oGssKeyEx: |
398 | intptr = &options->gss_keyex; | |
399 | goto parse_flag; | |
400 | ||
5598e598 | 401 | case oGssDelegateCreds: |
402 | intptr = &options->gss_deleg_creds; | |
403 | goto parse_flag; | |
5598e598 | 404 | |
3c0ef626 | 405 | case oBatchMode: |
406 | intptr = &options->batch_mode; | |
407 | goto parse_flag; | |
408 | ||
409 | case oCheckHostIP: | |
410 | intptr = &options->check_host_ip; | |
411 | goto parse_flag; | |
412 | ||
7cac2b65 | 413 | case oVerifyHostKeyDNS: |
414 | intptr = &options->verify_host_key_dns; | |
540d72c3 | 415 | goto parse_yesnoask; |
7cac2b65 | 416 | |
3c0ef626 | 417 | case oStrictHostKeyChecking: |
418 | intptr = &options->strict_host_key_checking; | |
540d72c3 | 419 | parse_yesnoask: |
3c0ef626 | 420 | arg = strdelim(&s); |
421 | if (!arg || *arg == '\0') | |
422 | fatal("%.200s line %d: Missing yes/no/ask argument.", | |
e9702f7d | 423 | filename, linenum); |
3c0ef626 | 424 | value = 0; /* To avoid compiler warning... */ |
425 | if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0) | |
426 | value = 1; | |
427 | else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0) | |
428 | value = 0; | |
429 | else if (strcmp(arg, "ask") == 0) | |
430 | value = 2; | |
431 | else | |
432 | fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum); | |
433 | if (*activep && *intptr == -1) | |
434 | *intptr = value; | |
435 | break; | |
436 | ||
437 | case oCompression: | |
438 | intptr = &options->compression; | |
439 | goto parse_flag; | |
440 | ||
540d72c3 | 441 | case oTCPKeepAlive: |
442 | intptr = &options->tcp_keep_alive; | |
3c0ef626 | 443 | goto parse_flag; |
444 | ||
445 | case oNoHostAuthenticationForLocalhost: | |
446 | intptr = &options->no_host_authentication_for_localhost; | |
447 | goto parse_flag; | |
448 | ||
449 | case oNumberOfPasswordPrompts: | |
450 | intptr = &options->number_of_password_prompts; | |
451 | goto parse_int; | |
452 | ||
453 | case oCompressionLevel: | |
454 | intptr = &options->compression_level; | |
455 | goto parse_int; | |
456 | ||
7cac2b65 | 457 | case oRekeyLimit: |
458 | intptr = &options->rekey_limit; | |
459 | arg = strdelim(&s); | |
460 | if (!arg || *arg == '\0') | |
461 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
462 | if (arg[0] < '0' || arg[0] > '9') | |
463 | fatal("%.200s line %d: Bad number.", filename, linenum); | |
464 | value = strtol(arg, &endofnumber, 10); | |
465 | if (arg == endofnumber) | |
466 | fatal("%.200s line %d: Bad number.", filename, linenum); | |
467 | switch (toupper(*endofnumber)) { | |
468 | case 'K': | |
469 | value *= 1<<10; | |
470 | break; | |
471 | case 'M': | |
472 | value *= 1<<20; | |
473 | break; | |
474 | case 'G': | |
475 | value *= 1<<30; | |
476 | break; | |
477 | } | |
478 | if (*activep && *intptr == -1) | |
479 | *intptr = value; | |
480 | break; | |
481 | ||
3c0ef626 | 482 | case oIdentityFile: |
483 | arg = strdelim(&s); | |
484 | if (!arg || *arg == '\0') | |
485 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
486 | if (*activep) { | |
487 | intptr = &options->num_identity_files; | |
488 | if (*intptr >= SSH_MAX_IDENTITY_FILES) | |
489 | fatal("%.200s line %d: Too many identity files specified (max %d).", | |
e9702f7d | 490 | filename, linenum, SSH_MAX_IDENTITY_FILES); |
3c0ef626 | 491 | charptr = &options->identity_files[*intptr]; |
492 | *charptr = xstrdup(arg); | |
493 | *intptr = *intptr + 1; | |
494 | } | |
495 | break; | |
496 | ||
497 | case oXAuthLocation: | |
498 | charptr=&options->xauth_location; | |
499 | goto parse_string; | |
500 | ||
501 | case oUser: | |
502 | charptr = &options->user; | |
503 | parse_string: | |
504 | arg = strdelim(&s); | |
505 | if (!arg || *arg == '\0') | |
506 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
507 | if (*activep && *charptr == NULL) | |
508 | *charptr = xstrdup(arg); | |
509 | break; | |
510 | ||
511 | case oGlobalKnownHostsFile: | |
512 | charptr = &options->system_hostfile; | |
513 | goto parse_string; | |
514 | ||
515 | case oUserKnownHostsFile: | |
516 | charptr = &options->user_hostfile; | |
517 | goto parse_string; | |
518 | ||
519 | case oGlobalKnownHostsFile2: | |
520 | charptr = &options->system_hostfile2; | |
521 | goto parse_string; | |
522 | ||
523 | case oUserKnownHostsFile2: | |
524 | charptr = &options->user_hostfile2; | |
525 | goto parse_string; | |
526 | ||
527 | case oHostName: | |
528 | charptr = &options->hostname; | |
529 | goto parse_string; | |
530 | ||
531 | case oHostKeyAlias: | |
532 | charptr = &options->host_key_alias; | |
533 | goto parse_string; | |
534 | ||
535 | case oPreferredAuthentications: | |
536 | charptr = &options->preferred_authentications; | |
537 | goto parse_string; | |
538 | ||
539 | case oBindAddress: | |
540 | charptr = &options->bind_address; | |
541 | goto parse_string; | |
542 | ||
543 | case oSmartcardDevice: | |
544 | charptr = &options->smartcard_device; | |
545 | goto parse_string; | |
546 | ||
547 | case oProxyCommand: | |
7cac2b65 | 548 | if (s == NULL) |
549 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
3c0ef626 | 550 | charptr = &options->proxy_command; |
bfe49944 | 551 | len = strspn(s, WHITESPACE "="); |
3c0ef626 | 552 | if (*activep && *charptr == NULL) |
bfe49944 | 553 | *charptr = xstrdup(s + len); |
3c0ef626 | 554 | return 0; |
555 | ||
556 | case oPort: | |
557 | intptr = &options->port; | |
558 | parse_int: | |
559 | arg = strdelim(&s); | |
560 | if (!arg || *arg == '\0') | |
561 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
562 | if (arg[0] < '0' || arg[0] > '9') | |
563 | fatal("%.200s line %d: Bad number.", filename, linenum); | |
564 | ||
565 | /* Octal, decimal, or hex format? */ | |
566 | value = strtol(arg, &endofnumber, 0); | |
567 | if (arg == endofnumber) | |
568 | fatal("%.200s line %d: Bad number.", filename, linenum); | |
569 | if (*activep && *intptr == -1) | |
570 | *intptr = value; | |
571 | break; | |
572 | ||
573 | case oConnectionAttempts: | |
574 | intptr = &options->connection_attempts; | |
575 | goto parse_int; | |
576 | ||
577 | case oCipher: | |
578 | intptr = &options->cipher; | |
579 | arg = strdelim(&s); | |
580 | if (!arg || *arg == '\0') | |
581 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
582 | value = cipher_number(arg); | |
583 | if (value == -1) | |
584 | fatal("%.200s line %d: Bad cipher '%s'.", | |
e9702f7d | 585 | filename, linenum, arg ? arg : "<NONE>"); |
3c0ef626 | 586 | if (*activep && *intptr == -1) |
587 | *intptr = value; | |
588 | break; | |
589 | ||
590 | case oCiphers: | |
591 | arg = strdelim(&s); | |
592 | if (!arg || *arg == '\0') | |
593 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
594 | if (!ciphers_valid(arg)) | |
595 | fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.", | |
e9702f7d | 596 | filename, linenum, arg ? arg : "<NONE>"); |
3c0ef626 | 597 | if (*activep && options->ciphers == NULL) |
598 | options->ciphers = xstrdup(arg); | |
599 | break; | |
600 | ||
601 | case oMacs: | |
602 | arg = strdelim(&s); | |
603 | if (!arg || *arg == '\0') | |
604 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
605 | if (!mac_valid(arg)) | |
606 | fatal("%.200s line %d: Bad SSH2 Mac spec '%s'.", | |
e9702f7d | 607 | filename, linenum, arg ? arg : "<NONE>"); |
3c0ef626 | 608 | if (*activep && options->macs == NULL) |
609 | options->macs = xstrdup(arg); | |
610 | break; | |
611 | ||
612 | case oHostKeyAlgorithms: | |
613 | arg = strdelim(&s); | |
614 | if (!arg || *arg == '\0') | |
615 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
616 | if (!key_names_valid2(arg)) | |
617 | fatal("%.200s line %d: Bad protocol 2 host key algorithms '%s'.", | |
e9702f7d | 618 | filename, linenum, arg ? arg : "<NONE>"); |
3c0ef626 | 619 | if (*activep && options->hostkeyalgorithms == NULL) |
620 | options->hostkeyalgorithms = xstrdup(arg); | |
621 | break; | |
622 | ||
623 | case oProtocol: | |
624 | intptr = &options->protocol; | |
625 | arg = strdelim(&s); | |
626 | if (!arg || *arg == '\0') | |
627 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
628 | value = proto_spec(arg); | |
629 | if (value == SSH_PROTO_UNKNOWN) | |
630 | fatal("%.200s line %d: Bad protocol spec '%s'.", | |
e9702f7d | 631 | filename, linenum, arg ? arg : "<NONE>"); |
3c0ef626 | 632 | if (*activep && *intptr == SSH_PROTO_UNKNOWN) |
633 | *intptr = value; | |
634 | break; | |
635 | ||
636 | case oLogLevel: | |
637 | intptr = (int *) &options->log_level; | |
638 | arg = strdelim(&s); | |
639 | value = log_level_number(arg); | |
e9702f7d | 640 | if (value == SYSLOG_LEVEL_NOT_SET) |
3c0ef626 | 641 | fatal("%.200s line %d: unsupported log level '%s'", |
e9702f7d | 642 | filename, linenum, arg ? arg : "<NONE>"); |
643 | if (*activep && (LogLevel) *intptr == SYSLOG_LEVEL_NOT_SET) | |
3c0ef626 | 644 | *intptr = (LogLevel) value; |
645 | break; | |
646 | ||
647 | case oLocalForward: | |
648 | case oRemoteForward: | |
649 | arg = strdelim(&s); | |
650 | if (!arg || *arg == '\0') | |
651 | fatal("%.200s line %d: Missing port argument.", | |
652 | filename, linenum); | |
653 | if ((fwd_port = a2port(arg)) == 0) | |
654 | fatal("%.200s line %d: Bad listen port.", | |
655 | filename, linenum); | |
656 | arg = strdelim(&s); | |
657 | if (!arg || *arg == '\0') | |
658 | fatal("%.200s line %d: Missing second argument.", | |
659 | filename, linenum); | |
660 | if (sscanf(arg, "%255[^:]:%5[0-9]", buf, sfwd_host_port) != 2 && | |
661 | sscanf(arg, "%255[^/]/%5[0-9]", buf, sfwd_host_port) != 2) | |
662 | fatal("%.200s line %d: Bad forwarding specification.", | |
663 | filename, linenum); | |
664 | if ((fwd_host_port = a2port(sfwd_host_port)) == 0) | |
665 | fatal("%.200s line %d: Bad forwarding port.", | |
666 | filename, linenum); | |
667 | if (*activep) { | |
668 | if (opcode == oLocalForward) | |
669 | add_local_forward(options, fwd_port, buf, | |
670 | fwd_host_port); | |
671 | else if (opcode == oRemoteForward) | |
672 | add_remote_forward(options, fwd_port, buf, | |
673 | fwd_host_port); | |
674 | } | |
675 | break; | |
676 | ||
677 | case oDynamicForward: | |
678 | arg = strdelim(&s); | |
679 | if (!arg || *arg == '\0') | |
680 | fatal("%.200s line %d: Missing port argument.", | |
681 | filename, linenum); | |
682 | fwd_port = a2port(arg); | |
683 | if (fwd_port == 0) | |
684 | fatal("%.200s line %d: Badly formatted port number.", | |
685 | filename, linenum); | |
686 | if (*activep) | |
7cac2b65 | 687 | add_local_forward(options, fwd_port, "socks", 0); |
3c0ef626 | 688 | break; |
689 | ||
690 | case oClearAllForwardings: | |
691 | intptr = &options->clear_forwardings; | |
692 | goto parse_flag; | |
693 | ||
694 | case oHost: | |
695 | *activep = 0; | |
696 | while ((arg = strdelim(&s)) != NULL && *arg != '\0') | |
697 | if (match_pattern(host, arg)) { | |
698 | debug("Applying options for %.100s", arg); | |
699 | *activep = 1; | |
700 | break; | |
701 | } | |
702 | /* Avoid garbage check below, as strdelim is done. */ | |
703 | return 0; | |
704 | ||
705 | case oEscapeChar: | |
706 | intptr = &options->escape_char; | |
707 | arg = strdelim(&s); | |
708 | if (!arg || *arg == '\0') | |
709 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
710 | if (arg[0] == '^' && arg[2] == 0 && | |
711 | (u_char) arg[1] >= 64 && (u_char) arg[1] < 128) | |
712 | value = (u_char) arg[1] & 31; | |
713 | else if (strlen(arg) == 1) | |
714 | value = (u_char) arg[0]; | |
715 | else if (strcmp(arg, "none") == 0) | |
716 | value = SSH_ESCAPECHAR_NONE; | |
717 | else { | |
718 | fatal("%.200s line %d: Bad escape character.", | |
e9702f7d | 719 | filename, linenum); |
3c0ef626 | 720 | /* NOTREACHED */ |
721 | value = 0; /* Avoid compiler warning. */ | |
722 | } | |
723 | if (*activep && *intptr == -1) | |
724 | *intptr = value; | |
725 | break; | |
726 | ||
7cac2b65 | 727 | case oAddressFamily: |
728 | arg = strdelim(&s); | |
729 | intptr = &options->address_family; | |
730 | if (strcasecmp(arg, "inet") == 0) | |
731 | value = AF_INET; | |
732 | else if (strcasecmp(arg, "inet6") == 0) | |
733 | value = AF_INET6; | |
734 | else if (strcasecmp(arg, "any") == 0) | |
735 | value = AF_UNSPEC; | |
736 | else | |
737 | fatal("Unsupported AddressFamily \"%s\"", arg); | |
738 | if (*activep && *intptr == -1) | |
739 | *intptr = value; | |
740 | break; | |
741 | ||
bfe49944 | 742 | case oEnableSSHKeysign: |
743 | intptr = &options->enable_ssh_keysign; | |
744 | goto parse_flag; | |
745 | ||
12a403af | 746 | case oIdentitiesOnly: |
747 | intptr = &options->identities_only; | |
748 | goto parse_flag; | |
749 | ||
540d72c3 | 750 | case oServerAliveInterval: |
751 | intptr = &options->server_alive_interval; | |
752 | goto parse_time; | |
753 | ||
754 | case oServerAliveCountMax: | |
755 | intptr = &options->server_alive_count_max; | |
756 | goto parse_int; | |
757 | ||
44a053a3 | 758 | case oDeprecated: |
759 | debug("%s line %d: Deprecated option \"%s\"", | |
760 | filename, linenum, keyword); | |
761 | return 0; | |
762 | ||
7cac2b65 | 763 | case oUnsupported: |
764 | error("%s line %d: Unsupported option \"%s\"", | |
765 | filename, linenum, keyword); | |
766 | return 0; | |
767 | ||
3c0ef626 | 768 | default: |
769 | fatal("process_config_line: Unimplemented opcode %d", opcode); | |
770 | } | |
771 | ||
772 | /* Check that there is no garbage at end of line. */ | |
773 | if ((arg = strdelim(&s)) != NULL && *arg != '\0') { | |
774 | fatal("%.200s line %d: garbage at end of line; \"%.200s\".", | |
e9702f7d | 775 | filename, linenum, arg); |
3c0ef626 | 776 | } |
777 | return 0; | |
778 | } | |
779 | ||
780 | ||
781 | /* | |
782 | * Reads the config file and modifies the options accordingly. Options | |
783 | * should already be initialized before this call. This never returns if | |
784 | * there is an error. If the file does not exist, this returns 0. | |
785 | */ | |
786 | ||
787 | int | |
788 | read_config_file(const char *filename, const char *host, Options *options) | |
789 | { | |
790 | FILE *f; | |
791 | char line[1024]; | |
792 | int active, linenum; | |
793 | int bad_options = 0; | |
794 | ||
795 | /* Open the file. */ | |
796 | f = fopen(filename, "r"); | |
797 | if (!f) | |
798 | return 0; | |
799 | ||
800 | debug("Reading configuration data %.200s", filename); | |
801 | ||
802 | /* | |
803 | * Mark that we are now processing the options. This flag is turned | |
804 | * on/off by Host specifications. | |
805 | */ | |
806 | active = 1; | |
807 | linenum = 0; | |
808 | while (fgets(line, sizeof(line), f)) { | |
809 | /* Update line number counter. */ | |
810 | linenum++; | |
811 | if (process_config_line(options, host, line, filename, linenum, &active) != 0) | |
812 | bad_options++; | |
813 | } | |
814 | fclose(f); | |
815 | if (bad_options > 0) | |
816 | fatal("%s: terminating, %d bad configuration options", | |
e9702f7d | 817 | filename, bad_options); |
3c0ef626 | 818 | return 1; |
819 | } | |
820 | ||
821 | /* | |
822 | * Initializes options to special values that indicate that they have not yet | |
823 | * been set. Read_config_file will only set options with this value. Options | |
824 | * are processed in the following order: command line, user config file, | |
825 | * system config file. Last, fill_default_options is called. | |
826 | */ | |
827 | ||
828 | void | |
829 | initialize_options(Options * options) | |
830 | { | |
831 | memset(options, 'X', sizeof(*options)); | |
832 | options->forward_agent = -1; | |
833 | options->forward_x11 = -1; | |
540d72c3 | 834 | options->forward_x11_trusted = -1; |
3c0ef626 | 835 | options->xauth_location = NULL; |
836 | options->gateway_ports = -1; | |
837 | options->use_privileged_port = -1; | |
3c0ef626 | 838 | options->rsa_authentication = -1; |
839 | options->pubkey_authentication = -1; | |
840 | options->challenge_response_authentication = -1; | |
7cac2b65 | 841 | options->gss_authentication = -1; |
7a056ed1 | 842 | options->gss_keyex = -1; |
7cac2b65 | 843 | options->gss_deleg_creds = -1; |
3c0ef626 | 844 | options->password_authentication = -1; |
845 | options->kbd_interactive_authentication = -1; | |
846 | options->kbd_interactive_devices = NULL; | |
847 | options->rhosts_rsa_authentication = -1; | |
848 | options->hostbased_authentication = -1; | |
3c0ef626 | 849 | options->batch_mode = -1; |
850 | options->check_host_ip = -1; | |
851 | options->strict_host_key_checking = -1; | |
852 | options->compression = -1; | |
540d72c3 | 853 | options->tcp_keep_alive = -1; |
3c0ef626 | 854 | options->compression_level = -1; |
855 | options->port = -1; | |
7cac2b65 | 856 | options->address_family = -1; |
3c0ef626 | 857 | options->connection_attempts = -1; |
7cac2b65 | 858 | options->connection_timeout = -1; |
3c0ef626 | 859 | options->number_of_password_prompts = -1; |
860 | options->cipher = -1; | |
861 | options->ciphers = NULL; | |
862 | options->macs = NULL; | |
863 | options->hostkeyalgorithms = NULL; | |
864 | options->protocol = SSH_PROTO_UNKNOWN; | |
865 | options->num_identity_files = 0; | |
866 | options->hostname = NULL; | |
867 | options->host_key_alias = NULL; | |
868 | options->proxy_command = NULL; | |
869 | options->user = NULL; | |
870 | options->escape_char = -1; | |
871 | options->system_hostfile = NULL; | |
872 | options->user_hostfile = NULL; | |
873 | options->system_hostfile2 = NULL; | |
874 | options->user_hostfile2 = NULL; | |
875 | options->num_local_forwards = 0; | |
876 | options->num_remote_forwards = 0; | |
877 | options->clear_forwardings = -1; | |
e9702f7d | 878 | options->log_level = SYSLOG_LEVEL_NOT_SET; |
3c0ef626 | 879 | options->preferred_authentications = NULL; |
880 | options->bind_address = NULL; | |
881 | options->smartcard_device = NULL; | |
bfe49944 | 882 | options->enable_ssh_keysign = - 1; |
3c0ef626 | 883 | options->no_host_authentication_for_localhost = - 1; |
12a403af | 884 | options->identities_only = - 1; |
7cac2b65 | 885 | options->rekey_limit = - 1; |
886 | options->verify_host_key_dns = -1; | |
540d72c3 | 887 | options->server_alive_interval = -1; |
888 | options->server_alive_count_max = -1; | |
3c0ef626 | 889 | } |
890 | ||
891 | /* | |
892 | * Called after processing other sources of option data, this fills those | |
893 | * options for which no value has been specified with their default values. | |
894 | */ | |
895 | ||
896 | void | |
897 | fill_default_options(Options * options) | |
898 | { | |
899 | int len; | |
900 | ||
901 | if (options->forward_agent == -1) | |
902 | options->forward_agent = 0; | |
903 | if (options->forward_x11 == -1) | |
904 | options->forward_x11 = 0; | |
540d72c3 | 905 | if (options->forward_x11_trusted == -1) |
906 | options->forward_x11_trusted = 0; | |
3c0ef626 | 907 | if (options->xauth_location == NULL) |
908 | options->xauth_location = _PATH_XAUTH; | |
3c0ef626 | 909 | if (options->gateway_ports == -1) |
910 | options->gateway_ports = 0; | |
911 | if (options->use_privileged_port == -1) | |
912 | options->use_privileged_port = 0; | |
3c0ef626 | 913 | if (options->rsa_authentication == -1) |
914 | options->rsa_authentication = 1; | |
915 | if (options->pubkey_authentication == -1) | |
916 | options->pubkey_authentication = 1; | |
917 | if (options->challenge_response_authentication == -1) | |
918 | options->challenge_response_authentication = 1; | |
5598e598 | 919 | if (options->gss_authentication == -1) |
920 | options->gss_authentication = 1; | |
7a056ed1 | 921 | if (options->gss_keyex == -1) |
922 | options->gss_keyex = 1; | |
5598e598 | 923 | if (options->gss_deleg_creds == -1) |
924 | options->gss_deleg_creds = 1; | |
3c0ef626 | 925 | if (options->password_authentication == -1) |
926 | options->password_authentication = 1; | |
927 | if (options->kbd_interactive_authentication == -1) | |
928 | options->kbd_interactive_authentication = 1; | |
929 | if (options->rhosts_rsa_authentication == -1) | |
44a053a3 | 930 | options->rhosts_rsa_authentication = 0; |
3c0ef626 | 931 | if (options->hostbased_authentication == -1) |
932 | options->hostbased_authentication = 0; | |
3c0ef626 | 933 | if (options->batch_mode == -1) |
934 | options->batch_mode = 0; | |
935 | if (options->check_host_ip == -1) | |
936 | options->check_host_ip = 1; | |
937 | if (options->strict_host_key_checking == -1) | |
938 | options->strict_host_key_checking = 2; /* 2 is default */ | |
939 | if (options->compression == -1) | |
940 | options->compression = 0; | |
540d72c3 | 941 | if (options->tcp_keep_alive == -1) |
942 | options->tcp_keep_alive = 1; | |
3c0ef626 | 943 | if (options->compression_level == -1) |
944 | options->compression_level = 6; | |
945 | if (options->port == -1) | |
946 | options->port = 0; /* Filled in ssh_connect. */ | |
7cac2b65 | 947 | if (options->address_family == -1) |
948 | options->address_family = AF_UNSPEC; | |
3c0ef626 | 949 | if (options->connection_attempts == -1) |
950 | options->connection_attempts = 1; | |
951 | if (options->number_of_password_prompts == -1) | |
952 | options->number_of_password_prompts = 3; | |
953 | /* Selected in ssh_login(). */ | |
954 | if (options->cipher == -1) | |
955 | options->cipher = SSH_CIPHER_NOT_SET; | |
956 | /* options->ciphers, default set in myproposals.h */ | |
957 | /* options->macs, default set in myproposals.h */ | |
958 | /* options->hostkeyalgorithms, default set in myproposals.h */ | |
959 | if (options->protocol == SSH_PROTO_UNKNOWN) | |
960 | options->protocol = SSH_PROTO_1|SSH_PROTO_2; | |
961 | if (options->num_identity_files == 0) { | |
962 | if (options->protocol & SSH_PROTO_1) { | |
963 | len = 2 + strlen(_PATH_SSH_CLIENT_IDENTITY) + 1; | |
964 | options->identity_files[options->num_identity_files] = | |
965 | xmalloc(len); | |
966 | snprintf(options->identity_files[options->num_identity_files++], | |
967 | len, "~/%.100s", _PATH_SSH_CLIENT_IDENTITY); | |
968 | } | |
969 | if (options->protocol & SSH_PROTO_2) { | |
970 | len = 2 + strlen(_PATH_SSH_CLIENT_ID_RSA) + 1; | |
971 | options->identity_files[options->num_identity_files] = | |
972 | xmalloc(len); | |
973 | snprintf(options->identity_files[options->num_identity_files++], | |
974 | len, "~/%.100s", _PATH_SSH_CLIENT_ID_RSA); | |
975 | ||
976 | len = 2 + strlen(_PATH_SSH_CLIENT_ID_DSA) + 1; | |
977 | options->identity_files[options->num_identity_files] = | |
978 | xmalloc(len); | |
979 | snprintf(options->identity_files[options->num_identity_files++], | |
980 | len, "~/%.100s", _PATH_SSH_CLIENT_ID_DSA); | |
981 | } | |
982 | } | |
983 | if (options->escape_char == -1) | |
984 | options->escape_char = '~'; | |
985 | if (options->system_hostfile == NULL) | |
986 | options->system_hostfile = _PATH_SSH_SYSTEM_HOSTFILE; | |
987 | if (options->user_hostfile == NULL) | |
988 | options->user_hostfile = _PATH_SSH_USER_HOSTFILE; | |
989 | if (options->system_hostfile2 == NULL) | |
990 | options->system_hostfile2 = _PATH_SSH_SYSTEM_HOSTFILE2; | |
991 | if (options->user_hostfile2 == NULL) | |
992 | options->user_hostfile2 = _PATH_SSH_USER_HOSTFILE2; | |
e9702f7d | 993 | if (options->log_level == SYSLOG_LEVEL_NOT_SET) |
3c0ef626 | 994 | options->log_level = SYSLOG_LEVEL_INFO; |
995 | if (options->clear_forwardings == 1) | |
996 | clear_forwardings(options); | |
997 | if (options->no_host_authentication_for_localhost == - 1) | |
998 | options->no_host_authentication_for_localhost = 0; | |
12a403af | 999 | if (options->identities_only == -1) |
1000 | options->identities_only = 0; | |
bfe49944 | 1001 | if (options->enable_ssh_keysign == -1) |
1002 | options->enable_ssh_keysign = 0; | |
7cac2b65 | 1003 | if (options->rekey_limit == -1) |
1004 | options->rekey_limit = 0; | |
1005 | if (options->verify_host_key_dns == -1) | |
1006 | options->verify_host_key_dns = 0; | |
540d72c3 | 1007 | if (options->server_alive_interval == -1) |
1008 | options->server_alive_interval = 0; | |
1009 | if (options->server_alive_count_max == -1) | |
1010 | options->server_alive_count_max = 3; | |
3c0ef626 | 1011 | /* options->proxy_command should not be set by default */ |
1012 | /* options->user will be set in the main program if appropriate */ | |
1013 | /* options->hostname will be set in the main program if appropriate */ | |
1014 | /* options->host_key_alias should not be set by default */ | |
1015 | /* options->preferred_authentications will be set in ssh */ | |
1016 | } |