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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" | |
416fd2a8 | 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 | |
ff2d7a98 | 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 | |
ff2d7a98 | 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 |
416fd2a8 | 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, | |
416fd2a8 | 92 | oForwardAgent, oForwardX11, oForwardX11Trusted, oGatewayPorts, |
ff2d7a98 | 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, | |
416fd2a8 | 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, | |
ff2d7a98 | 105 | oClearAllForwardings, oNoHostAuthenticationForLocalhost, |
70791e56 | 106 | oEnableSSHKeysign, oRekeyLimit, oVerifyHostKeyDNS, oConnectTimeout, |
107 | oAddressFamily, oGssAuthentication, oGssKeyEx, oGssDelegateCreds, | |
416fd2a8 | 108 | oServerAliveInterval, oServerAliveCountMax, |
70791e56 | 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 }, | |
416fd2a8 | 120 | { "forwardx11trusted", oForwardX11Trusted }, |
3c0ef626 | 121 | { "xauthlocation", oXAuthLocation }, |
122 | { "gatewayports", oGatewayPorts }, | |
123 | { "useprivilegedport", oUsePrivilegedPort }, | |
70791e56 | 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 */ | |
70791e56 | 136 | { "kerberosauthentication", oUnsupported }, |
137 | { "kerberostgtpassing", oUnsupported }, | |
138 | { "afstokenpassing", oUnsupported }, | |
139 | #if defined(GSSAPI) | |
ff2d7a98 | 140 | { "gssapiauthentication", oGssAuthentication }, |
98f19977 | 141 | { "gssapikeyexchange", oGssKeyEx }, |
ff2d7a98 | 142 | { "gssapidelegatecredentials", oGssDelegateCreds }, |
70791e56 | 143 | #else |
144 | { "gssapiauthentication", oUnsupported }, | |
145 | { "gssapikeyexchange", oUnsupported }, | |
146 | { "gssapidelegatecredentials", oUnsupported }, | |
3c0ef626 | 147 | #endif |
ff2d7a98 | 148 | { "fallbacktorsh", oDeprecated }, |
149 | { "usersh", oDeprecated }, | |
3c0ef626 | 150 | { "identityfile", oIdentityFile }, |
151 | { "identityfile2", oIdentityFile }, /* alias */ | |
152 | { "hostname", oHostName }, | |
153 | { "hostkeyalias", oHostKeyAlias }, | |
154 | { "proxycommand", oProxyCommand }, | |
155 | { "port", oPort }, | |
156 | { "cipher", oCipher }, | |
157 | { "ciphers", oCiphers }, | |
158 | { "macs", oMacs }, | |
159 | { "protocol", oProtocol }, | |
160 | { "remoteforward", oRemoteForward }, | |
161 | { "localforward", oLocalForward }, | |
162 | { "user", oUser }, | |
163 | { "host", oHost }, | |
164 | { "escapechar", oEscapeChar }, | |
165 | { "globalknownhostsfile", oGlobalKnownHostsFile }, | |
166 | { "userknownhostsfile", oUserKnownHostsFile }, /* obsolete */ | |
167 | { "globalknownhostsfile2", oGlobalKnownHostsFile2 }, | |
168 | { "userknownhostsfile2", oUserKnownHostsFile2 }, /* obsolete */ | |
169 | { "connectionattempts", oConnectionAttempts }, | |
170 | { "batchmode", oBatchMode }, | |
171 | { "checkhostip", oCheckHostIP }, | |
172 | { "stricthostkeychecking", oStrictHostKeyChecking }, | |
173 | { "compression", oCompression }, | |
174 | { "compressionlevel", oCompressionLevel }, | |
416fd2a8 | 175 | { "tcpkeepalive", oTCPKeepAlive }, |
176 | { "keepalive", oTCPKeepAlive }, /* obsolete */ | |
3c0ef626 | 177 | { "numberofpasswordprompts", oNumberOfPasswordPrompts }, |
178 | { "loglevel", oLogLevel }, | |
179 | { "dynamicforward", oDynamicForward }, | |
180 | { "preferredauthentications", oPreferredAuthentications }, | |
181 | { "hostkeyalgorithms", oHostKeyAlgorithms }, | |
182 | { "bindaddress", oBindAddress }, | |
70791e56 | 183 | #ifdef SMARTCARD |
3c0ef626 | 184 | { "smartcarddevice", oSmartcardDevice }, |
70791e56 | 185 | #else |
186 | { "smartcarddevice", oUnsupported }, | |
187 | #endif | |
e9a17296 | 188 | { "clearallforwardings", oClearAllForwardings }, |
1c14df9e | 189 | { "enablesshkeysign", oEnableSSHKeysign }, |
70791e56 | 190 | { "verifyhostkeydns", oVerifyHostKeyDNS }, |
e9a17296 | 191 | { "nohostauthenticationforlocalhost", oNoHostAuthenticationForLocalhost }, |
70791e56 | 192 | { "rekeylimit", oRekeyLimit }, |
193 | { "connecttimeout", oConnectTimeout }, | |
194 | { "addressfamily", oAddressFamily }, | |
416fd2a8 | 195 | { "serveraliveinterval", oServerAliveInterval }, |
196 | { "serveralivecountmax", oServerAliveCountMax }, | |
e9a17296 | 197 | { NULL, oBadOption } |
3c0ef626 | 198 | }; |
199 | ||
200 | /* | |
201 | * Adds a local TCP/IP port forward to options. Never returns if there is an | |
202 | * error. | |
203 | */ | |
204 | ||
205 | void | |
206 | add_local_forward(Options *options, u_short port, const char *host, | |
207 | u_short host_port) | |
208 | { | |
209 | Forward *fwd; | |
e54b3d7c | 210 | #ifndef NO_IPPORT_RESERVED_CONCEPT |
3c0ef626 | 211 | extern uid_t original_real_uid; |
212 | if (port < IPPORT_RESERVED && original_real_uid != 0) | |
213 | fatal("Privileged ports can only be forwarded by root."); | |
214 | #endif | |
215 | if (options->num_local_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
216 | fatal("Too many local forwards (max %d).", SSH_MAX_FORWARDS_PER_DIRECTION); | |
217 | fwd = &options->local_forwards[options->num_local_forwards++]; | |
218 | fwd->port = port; | |
219 | fwd->host = xstrdup(host); | |
220 | fwd->host_port = host_port; | |
221 | } | |
222 | ||
223 | /* | |
224 | * Adds a remote TCP/IP port forward to options. Never returns if there is | |
225 | * an error. | |
226 | */ | |
227 | ||
228 | void | |
229 | add_remote_forward(Options *options, u_short port, const char *host, | |
230 | u_short host_port) | |
231 | { | |
232 | Forward *fwd; | |
233 | if (options->num_remote_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
234 | fatal("Too many remote forwards (max %d).", | |
e9a17296 | 235 | SSH_MAX_FORWARDS_PER_DIRECTION); |
3c0ef626 | 236 | fwd = &options->remote_forwards[options->num_remote_forwards++]; |
237 | fwd->port = port; | |
238 | fwd->host = xstrdup(host); | |
239 | fwd->host_port = host_port; | |
240 | } | |
241 | ||
242 | static void | |
243 | clear_forwardings(Options *options) | |
244 | { | |
245 | int i; | |
246 | ||
247 | for (i = 0; i < options->num_local_forwards; i++) | |
248 | xfree(options->local_forwards[i].host); | |
249 | options->num_local_forwards = 0; | |
250 | for (i = 0; i < options->num_remote_forwards; i++) | |
251 | xfree(options->remote_forwards[i].host); | |
252 | options->num_remote_forwards = 0; | |
253 | } | |
254 | ||
255 | /* | |
256 | * Returns the number of the token pointed to by cp or oBadOption. | |
257 | */ | |
258 | ||
259 | static OpCodes | |
260 | parse_token(const char *cp, const char *filename, int linenum) | |
261 | { | |
262 | u_int i; | |
263 | ||
264 | for (i = 0; keywords[i].name; i++) | |
265 | if (strcasecmp(cp, keywords[i].name) == 0) | |
266 | return keywords[i].opcode; | |
267 | ||
268 | error("%s: line %d: Bad configuration option: %s", | |
269 | filename, linenum, cp); | |
270 | return oBadOption; | |
271 | } | |
272 | ||
273 | /* | |
274 | * Processes a single option line as used in the configuration files. This | |
275 | * only sets those values that have not already been set. | |
276 | */ | |
1c14df9e | 277 | #define WHITESPACE " \t\r\n" |
3c0ef626 | 278 | |
279 | int | |
280 | process_config_line(Options *options, const char *host, | |
281 | char *line, const char *filename, int linenum, | |
282 | int *activep) | |
283 | { | |
1c14df9e | 284 | char buf[256], *s, **charptr, *endofnumber, *keyword, *arg; |
3c0ef626 | 285 | int opcode, *intptr, value; |
1c14df9e | 286 | size_t len; |
3c0ef626 | 287 | u_short fwd_port, fwd_host_port; |
288 | char sfwd_host_port[6]; | |
289 | ||
70791e56 | 290 | /* Strip trailing whitespace */ |
291 | for(len = strlen(line) - 1; len > 0; len--) { | |
292 | if (strchr(WHITESPACE, line[len]) == NULL) | |
293 | break; | |
294 | line[len] = '\0'; | |
295 | } | |
296 | ||
3c0ef626 | 297 | s = line; |
298 | /* Get the keyword. (Each line is supposed to begin with a keyword). */ | |
299 | keyword = strdelim(&s); | |
300 | /* Ignore leading whitespace. */ | |
301 | if (*keyword == '\0') | |
302 | keyword = strdelim(&s); | |
303 | if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#') | |
304 | return 0; | |
305 | ||
306 | opcode = parse_token(keyword, filename, linenum); | |
307 | ||
308 | switch (opcode) { | |
309 | case oBadOption: | |
310 | /* don't panic, but count bad options */ | |
311 | return -1; | |
312 | /* NOTREACHED */ | |
70791e56 | 313 | case oConnectTimeout: |
314 | intptr = &options->connection_timeout; | |
416fd2a8 | 315 | parse_time: |
70791e56 | 316 | arg = strdelim(&s); |
317 | if (!arg || *arg == '\0') | |
318 | fatal("%s line %d: missing time value.", | |
319 | filename, linenum); | |
320 | if ((value = convtime(arg)) == -1) | |
321 | fatal("%s line %d: invalid time value.", | |
322 | filename, linenum); | |
323 | if (*intptr == -1) | |
324 | *intptr = value; | |
325 | break; | |
326 | ||
3c0ef626 | 327 | case oForwardAgent: |
328 | intptr = &options->forward_agent; | |
329 | parse_flag: | |
330 | arg = strdelim(&s); | |
331 | if (!arg || *arg == '\0') | |
332 | fatal("%.200s line %d: Missing yes/no argument.", filename, linenum); | |
333 | value = 0; /* To avoid compiler warning... */ | |
334 | if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0) | |
335 | value = 1; | |
336 | else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0) | |
337 | value = 0; | |
338 | else | |
339 | fatal("%.200s line %d: Bad yes/no argument.", filename, linenum); | |
340 | if (*activep && *intptr == -1) | |
341 | *intptr = value; | |
342 | break; | |
343 | ||
344 | case oForwardX11: | |
345 | intptr = &options->forward_x11; | |
346 | goto parse_flag; | |
347 | ||
416fd2a8 | 348 | case oForwardX11Trusted: |
349 | intptr = &options->forward_x11_trusted; | |
350 | goto parse_flag; | |
351 | ||
3c0ef626 | 352 | case oGatewayPorts: |
353 | intptr = &options->gateway_ports; | |
354 | goto parse_flag; | |
355 | ||
356 | case oUsePrivilegedPort: | |
357 | intptr = &options->use_privileged_port; | |
358 | goto parse_flag; | |
359 | ||
3c0ef626 | 360 | case oPasswordAuthentication: |
361 | intptr = &options->password_authentication; | |
362 | goto parse_flag; | |
363 | ||
364 | case oKbdInteractiveAuthentication: | |
365 | intptr = &options->kbd_interactive_authentication; | |
366 | goto parse_flag; | |
367 | ||
368 | case oKbdInteractiveDevices: | |
369 | charptr = &options->kbd_interactive_devices; | |
370 | goto parse_string; | |
371 | ||
372 | case oPubkeyAuthentication: | |
373 | intptr = &options->pubkey_authentication; | |
374 | goto parse_flag; | |
375 | ||
376 | case oRSAAuthentication: | |
377 | intptr = &options->rsa_authentication; | |
378 | goto parse_flag; | |
379 | ||
380 | case oRhostsRSAAuthentication: | |
381 | intptr = &options->rhosts_rsa_authentication; | |
382 | goto parse_flag; | |
383 | ||
384 | case oHostbasedAuthentication: | |
385 | intptr = &options->hostbased_authentication; | |
386 | goto parse_flag; | |
387 | ||
388 | case oChallengeResponseAuthentication: | |
389 | intptr = &options->challenge_response_authentication; | |
390 | goto parse_flag; | |
70791e56 | 391 | |
ff2d7a98 | 392 | case oGssAuthentication: |
393 | intptr = &options->gss_authentication; | |
394 | goto parse_flag; | |
70791e56 | 395 | |
98f19977 | 396 | case oGssKeyEx: |
397 | intptr = &options->gss_keyex; | |
398 | goto parse_flag; | |
399 | ||
ff2d7a98 | 400 | case oGssDelegateCreds: |
401 | intptr = &options->gss_deleg_creds; | |
402 | goto parse_flag; | |
ff2d7a98 | 403 | |
3c0ef626 | 404 | case oBatchMode: |
405 | intptr = &options->batch_mode; | |
406 | goto parse_flag; | |
407 | ||
408 | case oCheckHostIP: | |
409 | intptr = &options->check_host_ip; | |
410 | goto parse_flag; | |
411 | ||
70791e56 | 412 | case oVerifyHostKeyDNS: |
413 | intptr = &options->verify_host_key_dns; | |
416fd2a8 | 414 | goto parse_yesnoask; |
70791e56 | 415 | |
3c0ef626 | 416 | case oStrictHostKeyChecking: |
417 | intptr = &options->strict_host_key_checking; | |
416fd2a8 | 418 | parse_yesnoask: |
3c0ef626 | 419 | arg = strdelim(&s); |
420 | if (!arg || *arg == '\0') | |
421 | fatal("%.200s line %d: Missing yes/no/ask argument.", | |
e9a17296 | 422 | filename, linenum); |
3c0ef626 | 423 | value = 0; /* To avoid compiler warning... */ |
424 | if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0) | |
425 | value = 1; | |
426 | else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0) | |
427 | value = 0; | |
428 | else if (strcmp(arg, "ask") == 0) | |
429 | value = 2; | |
430 | else | |
431 | fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum); | |
432 | if (*activep && *intptr == -1) | |
433 | *intptr = value; | |
434 | break; | |
435 | ||
436 | case oCompression: | |
437 | intptr = &options->compression; | |
438 | goto parse_flag; | |
439 | ||
416fd2a8 | 440 | case oTCPKeepAlive: |
441 | intptr = &options->tcp_keep_alive; | |
3c0ef626 | 442 | goto parse_flag; |
443 | ||
444 | case oNoHostAuthenticationForLocalhost: | |
445 | intptr = &options->no_host_authentication_for_localhost; | |
446 | goto parse_flag; | |
447 | ||
448 | case oNumberOfPasswordPrompts: | |
449 | intptr = &options->number_of_password_prompts; | |
450 | goto parse_int; | |
451 | ||
452 | case oCompressionLevel: | |
453 | intptr = &options->compression_level; | |
454 | goto parse_int; | |
455 | ||
70791e56 | 456 | case oRekeyLimit: |
457 | intptr = &options->rekey_limit; | |
458 | arg = strdelim(&s); | |
459 | if (!arg || *arg == '\0') | |
460 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
461 | if (arg[0] < '0' || arg[0] > '9') | |
462 | fatal("%.200s line %d: Bad number.", filename, linenum); | |
463 | value = strtol(arg, &endofnumber, 10); | |
464 | if (arg == endofnumber) | |
465 | fatal("%.200s line %d: Bad number.", filename, linenum); | |
466 | switch (toupper(*endofnumber)) { | |
467 | case 'K': | |
468 | value *= 1<<10; | |
469 | break; | |
470 | case 'M': | |
471 | value *= 1<<20; | |
472 | break; | |
473 | case 'G': | |
474 | value *= 1<<30; | |
475 | break; | |
476 | } | |
477 | if (*activep && *intptr == -1) | |
478 | *intptr = value; | |
479 | break; | |
480 | ||
3c0ef626 | 481 | case oIdentityFile: |
482 | arg = strdelim(&s); | |
483 | if (!arg || *arg == '\0') | |
484 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
485 | if (*activep) { | |
486 | intptr = &options->num_identity_files; | |
487 | if (*intptr >= SSH_MAX_IDENTITY_FILES) | |
488 | fatal("%.200s line %d: Too many identity files specified (max %d).", | |
e9a17296 | 489 | filename, linenum, SSH_MAX_IDENTITY_FILES); |
3c0ef626 | 490 | charptr = &options->identity_files[*intptr]; |
491 | *charptr = xstrdup(arg); | |
492 | *intptr = *intptr + 1; | |
493 | } | |
494 | break; | |
495 | ||
496 | case oXAuthLocation: | |
497 | charptr=&options->xauth_location; | |
498 | goto parse_string; | |
499 | ||
500 | case oUser: | |
501 | charptr = &options->user; | |
502 | parse_string: | |
503 | arg = strdelim(&s); | |
504 | if (!arg || *arg == '\0') | |
505 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
506 | if (*activep && *charptr == NULL) | |
507 | *charptr = xstrdup(arg); | |
508 | break; | |
509 | ||
510 | case oGlobalKnownHostsFile: | |
511 | charptr = &options->system_hostfile; | |
512 | goto parse_string; | |
513 | ||
514 | case oUserKnownHostsFile: | |
515 | charptr = &options->user_hostfile; | |
516 | goto parse_string; | |
517 | ||
518 | case oGlobalKnownHostsFile2: | |
519 | charptr = &options->system_hostfile2; | |
520 | goto parse_string; | |
521 | ||
522 | case oUserKnownHostsFile2: | |
523 | charptr = &options->user_hostfile2; | |
524 | goto parse_string; | |
525 | ||
526 | case oHostName: | |
527 | charptr = &options->hostname; | |
528 | goto parse_string; | |
529 | ||
530 | case oHostKeyAlias: | |
531 | charptr = &options->host_key_alias; | |
532 | goto parse_string; | |
533 | ||
534 | case oPreferredAuthentications: | |
535 | charptr = &options->preferred_authentications; | |
536 | goto parse_string; | |
537 | ||
538 | case oBindAddress: | |
539 | charptr = &options->bind_address; | |
540 | goto parse_string; | |
541 | ||
542 | case oSmartcardDevice: | |
543 | charptr = &options->smartcard_device; | |
544 | goto parse_string; | |
545 | ||
546 | case oProxyCommand: | |
70791e56 | 547 | if (s == NULL) |
548 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
3c0ef626 | 549 | charptr = &options->proxy_command; |
1c14df9e | 550 | len = strspn(s, WHITESPACE "="); |
3c0ef626 | 551 | if (*activep && *charptr == NULL) |
1c14df9e | 552 | *charptr = xstrdup(s + len); |
3c0ef626 | 553 | return 0; |
554 | ||
555 | case oPort: | |
556 | intptr = &options->port; | |
557 | parse_int: | |
558 | arg = strdelim(&s); | |
559 | if (!arg || *arg == '\0') | |
560 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
561 | if (arg[0] < '0' || arg[0] > '9') | |
562 | fatal("%.200s line %d: Bad number.", filename, linenum); | |
563 | ||
564 | /* Octal, decimal, or hex format? */ | |
565 | value = strtol(arg, &endofnumber, 0); | |
566 | if (arg == endofnumber) | |
567 | fatal("%.200s line %d: Bad number.", filename, linenum); | |
568 | if (*activep && *intptr == -1) | |
569 | *intptr = value; | |
570 | break; | |
571 | ||
572 | case oConnectionAttempts: | |
573 | intptr = &options->connection_attempts; | |
574 | goto parse_int; | |
575 | ||
576 | case oCipher: | |
577 | intptr = &options->cipher; | |
578 | arg = strdelim(&s); | |
579 | if (!arg || *arg == '\0') | |
580 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
581 | value = cipher_number(arg); | |
582 | if (value == -1) | |
583 | fatal("%.200s line %d: Bad cipher '%s'.", | |
e9a17296 | 584 | filename, linenum, arg ? arg : "<NONE>"); |
3c0ef626 | 585 | if (*activep && *intptr == -1) |
586 | *intptr = value; | |
587 | break; | |
588 | ||
589 | case oCiphers: | |
590 | arg = strdelim(&s); | |
591 | if (!arg || *arg == '\0') | |
592 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
593 | if (!ciphers_valid(arg)) | |
594 | fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.", | |
e9a17296 | 595 | filename, linenum, arg ? arg : "<NONE>"); |
3c0ef626 | 596 | if (*activep && options->ciphers == NULL) |
597 | options->ciphers = xstrdup(arg); | |
598 | break; | |
599 | ||
600 | case oMacs: | |
601 | arg = strdelim(&s); | |
602 | if (!arg || *arg == '\0') | |
603 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
604 | if (!mac_valid(arg)) | |
605 | fatal("%.200s line %d: Bad SSH2 Mac spec '%s'.", | |
e9a17296 | 606 | filename, linenum, arg ? arg : "<NONE>"); |
3c0ef626 | 607 | if (*activep && options->macs == NULL) |
608 | options->macs = xstrdup(arg); | |
609 | break; | |
610 | ||
611 | case oHostKeyAlgorithms: | |
612 | arg = strdelim(&s); | |
613 | if (!arg || *arg == '\0') | |
614 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
615 | if (!key_names_valid2(arg)) | |
616 | fatal("%.200s line %d: Bad protocol 2 host key algorithms '%s'.", | |
e9a17296 | 617 | filename, linenum, arg ? arg : "<NONE>"); |
3c0ef626 | 618 | if (*activep && options->hostkeyalgorithms == NULL) |
619 | options->hostkeyalgorithms = xstrdup(arg); | |
620 | break; | |
621 | ||
622 | case oProtocol: | |
623 | intptr = &options->protocol; | |
624 | arg = strdelim(&s); | |
625 | if (!arg || *arg == '\0') | |
626 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
627 | value = proto_spec(arg); | |
628 | if (value == SSH_PROTO_UNKNOWN) | |
629 | fatal("%.200s line %d: Bad protocol spec '%s'.", | |
e9a17296 | 630 | filename, linenum, arg ? arg : "<NONE>"); |
3c0ef626 | 631 | if (*activep && *intptr == SSH_PROTO_UNKNOWN) |
632 | *intptr = value; | |
633 | break; | |
634 | ||
635 | case oLogLevel: | |
636 | intptr = (int *) &options->log_level; | |
637 | arg = strdelim(&s); | |
638 | value = log_level_number(arg); | |
e9a17296 | 639 | if (value == SYSLOG_LEVEL_NOT_SET) |
3c0ef626 | 640 | fatal("%.200s line %d: unsupported log level '%s'", |
e9a17296 | 641 | filename, linenum, arg ? arg : "<NONE>"); |
642 | if (*activep && (LogLevel) *intptr == SYSLOG_LEVEL_NOT_SET) | |
3c0ef626 | 643 | *intptr = (LogLevel) value; |
644 | break; | |
645 | ||
646 | case oLocalForward: | |
647 | case oRemoteForward: | |
648 | arg = strdelim(&s); | |
649 | if (!arg || *arg == '\0') | |
650 | fatal("%.200s line %d: Missing port argument.", | |
651 | filename, linenum); | |
652 | if ((fwd_port = a2port(arg)) == 0) | |
653 | fatal("%.200s line %d: Bad listen port.", | |
654 | filename, linenum); | |
655 | arg = strdelim(&s); | |
656 | if (!arg || *arg == '\0') | |
657 | fatal("%.200s line %d: Missing second argument.", | |
658 | filename, linenum); | |
659 | if (sscanf(arg, "%255[^:]:%5[0-9]", buf, sfwd_host_port) != 2 && | |
660 | sscanf(arg, "%255[^/]/%5[0-9]", buf, sfwd_host_port) != 2) | |
661 | fatal("%.200s line %d: Bad forwarding specification.", | |
662 | filename, linenum); | |
663 | if ((fwd_host_port = a2port(sfwd_host_port)) == 0) | |
664 | fatal("%.200s line %d: Bad forwarding port.", | |
665 | filename, linenum); | |
666 | if (*activep) { | |
667 | if (opcode == oLocalForward) | |
668 | add_local_forward(options, fwd_port, buf, | |
669 | fwd_host_port); | |
670 | else if (opcode == oRemoteForward) | |
671 | add_remote_forward(options, fwd_port, buf, | |
672 | fwd_host_port); | |
673 | } | |
674 | break; | |
675 | ||
676 | case oDynamicForward: | |
677 | arg = strdelim(&s); | |
678 | if (!arg || *arg == '\0') | |
679 | fatal("%.200s line %d: Missing port argument.", | |
680 | filename, linenum); | |
681 | fwd_port = a2port(arg); | |
682 | if (fwd_port == 0) | |
683 | fatal("%.200s line %d: Badly formatted port number.", | |
684 | filename, linenum); | |
685 | if (*activep) | |
70791e56 | 686 | add_local_forward(options, fwd_port, "socks", 0); |
3c0ef626 | 687 | break; |
688 | ||
689 | case oClearAllForwardings: | |
690 | intptr = &options->clear_forwardings; | |
691 | goto parse_flag; | |
692 | ||
693 | case oHost: | |
694 | *activep = 0; | |
695 | while ((arg = strdelim(&s)) != NULL && *arg != '\0') | |
696 | if (match_pattern(host, arg)) { | |
697 | debug("Applying options for %.100s", arg); | |
698 | *activep = 1; | |
699 | break; | |
700 | } | |
701 | /* Avoid garbage check below, as strdelim is done. */ | |
702 | return 0; | |
703 | ||
704 | case oEscapeChar: | |
705 | intptr = &options->escape_char; | |
706 | arg = strdelim(&s); | |
707 | if (!arg || *arg == '\0') | |
708 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
709 | if (arg[0] == '^' && arg[2] == 0 && | |
710 | (u_char) arg[1] >= 64 && (u_char) arg[1] < 128) | |
711 | value = (u_char) arg[1] & 31; | |
712 | else if (strlen(arg) == 1) | |
713 | value = (u_char) arg[0]; | |
714 | else if (strcmp(arg, "none") == 0) | |
715 | value = SSH_ESCAPECHAR_NONE; | |
716 | else { | |
717 | fatal("%.200s line %d: Bad escape character.", | |
e9a17296 | 718 | filename, linenum); |
3c0ef626 | 719 | /* NOTREACHED */ |
720 | value = 0; /* Avoid compiler warning. */ | |
721 | } | |
722 | if (*activep && *intptr == -1) | |
723 | *intptr = value; | |
724 | break; | |
725 | ||
70791e56 | 726 | case oAddressFamily: |
727 | arg = strdelim(&s); | |
728 | intptr = &options->address_family; | |
729 | if (strcasecmp(arg, "inet") == 0) | |
730 | value = AF_INET; | |
731 | else if (strcasecmp(arg, "inet6") == 0) | |
732 | value = AF_INET6; | |
733 | else if (strcasecmp(arg, "any") == 0) | |
734 | value = AF_UNSPEC; | |
735 | else | |
736 | fatal("Unsupported AddressFamily \"%s\"", arg); | |
737 | if (*activep && *intptr == -1) | |
738 | *intptr = value; | |
739 | break; | |
740 | ||
1c14df9e | 741 | case oEnableSSHKeysign: |
742 | intptr = &options->enable_ssh_keysign; | |
743 | goto parse_flag; | |
744 | ||
416fd2a8 | 745 | case oServerAliveInterval: |
746 | intptr = &options->server_alive_interval; | |
747 | goto parse_time; | |
748 | ||
749 | case oServerAliveCountMax: | |
750 | intptr = &options->server_alive_count_max; | |
751 | goto parse_int; | |
752 | ||
ff2d7a98 | 753 | case oDeprecated: |
754 | debug("%s line %d: Deprecated option \"%s\"", | |
755 | filename, linenum, keyword); | |
756 | return 0; | |
757 | ||
70791e56 | 758 | case oUnsupported: |
759 | error("%s line %d: Unsupported option \"%s\"", | |
760 | filename, linenum, keyword); | |
761 | return 0; | |
762 | ||
3c0ef626 | 763 | default: |
764 | fatal("process_config_line: Unimplemented opcode %d", opcode); | |
765 | } | |
766 | ||
767 | /* Check that there is no garbage at end of line. */ | |
768 | if ((arg = strdelim(&s)) != NULL && *arg != '\0') { | |
769 | fatal("%.200s line %d: garbage at end of line; \"%.200s\".", | |
e9a17296 | 770 | filename, linenum, arg); |
3c0ef626 | 771 | } |
772 | return 0; | |
773 | } | |
774 | ||
775 | ||
776 | /* | |
777 | * Reads the config file and modifies the options accordingly. Options | |
778 | * should already be initialized before this call. This never returns if | |
779 | * there is an error. If the file does not exist, this returns 0. | |
780 | */ | |
781 | ||
782 | int | |
783 | read_config_file(const char *filename, const char *host, Options *options) | |
784 | { | |
785 | FILE *f; | |
786 | char line[1024]; | |
787 | int active, linenum; | |
788 | int bad_options = 0; | |
789 | ||
790 | /* Open the file. */ | |
791 | f = fopen(filename, "r"); | |
792 | if (!f) | |
793 | return 0; | |
794 | ||
795 | debug("Reading configuration data %.200s", filename); | |
796 | ||
797 | /* | |
798 | * Mark that we are now processing the options. This flag is turned | |
799 | * on/off by Host specifications. | |
800 | */ | |
801 | active = 1; | |
802 | linenum = 0; | |
803 | while (fgets(line, sizeof(line), f)) { | |
804 | /* Update line number counter. */ | |
805 | linenum++; | |
806 | if (process_config_line(options, host, line, filename, linenum, &active) != 0) | |
807 | bad_options++; | |
808 | } | |
809 | fclose(f); | |
810 | if (bad_options > 0) | |
811 | fatal("%s: terminating, %d bad configuration options", | |
e9a17296 | 812 | filename, bad_options); |
3c0ef626 | 813 | return 1; |
814 | } | |
815 | ||
816 | /* | |
817 | * Initializes options to special values that indicate that they have not yet | |
818 | * been set. Read_config_file will only set options with this value. Options | |
819 | * are processed in the following order: command line, user config file, | |
820 | * system config file. Last, fill_default_options is called. | |
821 | */ | |
822 | ||
823 | void | |
824 | initialize_options(Options * options) | |
825 | { | |
826 | memset(options, 'X', sizeof(*options)); | |
827 | options->forward_agent = -1; | |
828 | options->forward_x11 = -1; | |
416fd2a8 | 829 | options->forward_x11_trusted = -1; |
3c0ef626 | 830 | options->xauth_location = NULL; |
831 | options->gateway_ports = -1; | |
832 | options->use_privileged_port = -1; | |
3c0ef626 | 833 | options->rsa_authentication = -1; |
834 | options->pubkey_authentication = -1; | |
835 | options->challenge_response_authentication = -1; | |
70791e56 | 836 | options->gss_authentication = -1; |
98f19977 | 837 | options->gss_keyex = -1; |
70791e56 | 838 | options->gss_deleg_creds = -1; |
3c0ef626 | 839 | options->password_authentication = -1; |
840 | options->kbd_interactive_authentication = -1; | |
841 | options->kbd_interactive_devices = NULL; | |
842 | options->rhosts_rsa_authentication = -1; | |
843 | options->hostbased_authentication = -1; | |
3c0ef626 | 844 | options->batch_mode = -1; |
845 | options->check_host_ip = -1; | |
846 | options->strict_host_key_checking = -1; | |
847 | options->compression = -1; | |
416fd2a8 | 848 | options->tcp_keep_alive = -1; |
3c0ef626 | 849 | options->compression_level = -1; |
850 | options->port = -1; | |
70791e56 | 851 | options->address_family = -1; |
3c0ef626 | 852 | options->connection_attempts = -1; |
70791e56 | 853 | options->connection_timeout = -1; |
3c0ef626 | 854 | options->number_of_password_prompts = -1; |
855 | options->cipher = -1; | |
856 | options->ciphers = NULL; | |
857 | options->macs = NULL; | |
858 | options->hostkeyalgorithms = NULL; | |
859 | options->protocol = SSH_PROTO_UNKNOWN; | |
860 | options->num_identity_files = 0; | |
861 | options->hostname = NULL; | |
862 | options->host_key_alias = NULL; | |
863 | options->proxy_command = NULL; | |
864 | options->user = NULL; | |
865 | options->escape_char = -1; | |
866 | options->system_hostfile = NULL; | |
867 | options->user_hostfile = NULL; | |
868 | options->system_hostfile2 = NULL; | |
869 | options->user_hostfile2 = NULL; | |
870 | options->num_local_forwards = 0; | |
871 | options->num_remote_forwards = 0; | |
872 | options->clear_forwardings = -1; | |
e9a17296 | 873 | options->log_level = SYSLOG_LEVEL_NOT_SET; |
3c0ef626 | 874 | options->preferred_authentications = NULL; |
875 | options->bind_address = NULL; | |
876 | options->smartcard_device = NULL; | |
1c14df9e | 877 | options->enable_ssh_keysign = - 1; |
3c0ef626 | 878 | options->no_host_authentication_for_localhost = - 1; |
70791e56 | 879 | options->rekey_limit = - 1; |
880 | options->verify_host_key_dns = -1; | |
416fd2a8 | 881 | options->server_alive_interval = -1; |
882 | options->server_alive_count_max = -1; | |
3c0ef626 | 883 | } |
884 | ||
885 | /* | |
886 | * Called after processing other sources of option data, this fills those | |
887 | * options for which no value has been specified with their default values. | |
888 | */ | |
889 | ||
890 | void | |
891 | fill_default_options(Options * options) | |
892 | { | |
893 | int len; | |
894 | ||
895 | if (options->forward_agent == -1) | |
896 | options->forward_agent = 0; | |
897 | if (options->forward_x11 == -1) | |
898 | options->forward_x11 = 0; | |
416fd2a8 | 899 | if (options->forward_x11_trusted == -1) |
900 | options->forward_x11_trusted = 0; | |
3c0ef626 | 901 | if (options->xauth_location == NULL) |
902 | options->xauth_location = _PATH_XAUTH; | |
3c0ef626 | 903 | if (options->gateway_ports == -1) |
904 | options->gateway_ports = 0; | |
905 | if (options->use_privileged_port == -1) | |
906 | options->use_privileged_port = 0; | |
3c0ef626 | 907 | if (options->rsa_authentication == -1) |
908 | options->rsa_authentication = 1; | |
909 | if (options->pubkey_authentication == -1) | |
910 | options->pubkey_authentication = 1; | |
911 | if (options->challenge_response_authentication == -1) | |
912 | options->challenge_response_authentication = 1; | |
ff2d7a98 | 913 | if (options->gss_authentication == -1) |
914 | options->gss_authentication = 1; | |
98f19977 | 915 | if (options->gss_keyex == -1) |
916 | options->gss_keyex = 1; | |
ff2d7a98 | 917 | if (options->gss_deleg_creds == -1) |
918 | options->gss_deleg_creds = 1; | |
3c0ef626 | 919 | if (options->password_authentication == -1) |
920 | options->password_authentication = 1; | |
921 | if (options->kbd_interactive_authentication == -1) | |
922 | options->kbd_interactive_authentication = 1; | |
923 | if (options->rhosts_rsa_authentication == -1) | |
ff2d7a98 | 924 | options->rhosts_rsa_authentication = 0; |
3c0ef626 | 925 | if (options->hostbased_authentication == -1) |
926 | options->hostbased_authentication = 0; | |
3c0ef626 | 927 | if (options->batch_mode == -1) |
928 | options->batch_mode = 0; | |
929 | if (options->check_host_ip == -1) | |
930 | options->check_host_ip = 1; | |
931 | if (options->strict_host_key_checking == -1) | |
932 | options->strict_host_key_checking = 2; /* 2 is default */ | |
933 | if (options->compression == -1) | |
934 | options->compression = 0; | |
416fd2a8 | 935 | if (options->tcp_keep_alive == -1) |
936 | options->tcp_keep_alive = 1; | |
3c0ef626 | 937 | if (options->compression_level == -1) |
938 | options->compression_level = 6; | |
939 | if (options->port == -1) | |
940 | options->port = 0; /* Filled in ssh_connect. */ | |
70791e56 | 941 | if (options->address_family == -1) |
942 | options->address_family = AF_UNSPEC; | |
3c0ef626 | 943 | if (options->connection_attempts == -1) |
944 | options->connection_attempts = 1; | |
945 | if (options->number_of_password_prompts == -1) | |
946 | options->number_of_password_prompts = 3; | |
947 | /* Selected in ssh_login(). */ | |
948 | if (options->cipher == -1) | |
949 | options->cipher = SSH_CIPHER_NOT_SET; | |
950 | /* options->ciphers, default set in myproposals.h */ | |
951 | /* options->macs, default set in myproposals.h */ | |
952 | /* options->hostkeyalgorithms, default set in myproposals.h */ | |
953 | if (options->protocol == SSH_PROTO_UNKNOWN) | |
954 | options->protocol = SSH_PROTO_1|SSH_PROTO_2; | |
955 | if (options->num_identity_files == 0) { | |
956 | if (options->protocol & SSH_PROTO_1) { | |
957 | len = 2 + strlen(_PATH_SSH_CLIENT_IDENTITY) + 1; | |
958 | options->identity_files[options->num_identity_files] = | |
959 | xmalloc(len); | |
960 | snprintf(options->identity_files[options->num_identity_files++], | |
961 | len, "~/%.100s", _PATH_SSH_CLIENT_IDENTITY); | |
962 | } | |
963 | if (options->protocol & SSH_PROTO_2) { | |
964 | len = 2 + strlen(_PATH_SSH_CLIENT_ID_RSA) + 1; | |
965 | options->identity_files[options->num_identity_files] = | |
966 | xmalloc(len); | |
967 | snprintf(options->identity_files[options->num_identity_files++], | |
968 | len, "~/%.100s", _PATH_SSH_CLIENT_ID_RSA); | |
969 | ||
970 | len = 2 + strlen(_PATH_SSH_CLIENT_ID_DSA) + 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_DSA); | |
975 | } | |
976 | } | |
977 | if (options->escape_char == -1) | |
978 | options->escape_char = '~'; | |
979 | if (options->system_hostfile == NULL) | |
980 | options->system_hostfile = _PATH_SSH_SYSTEM_HOSTFILE; | |
981 | if (options->user_hostfile == NULL) | |
982 | options->user_hostfile = _PATH_SSH_USER_HOSTFILE; | |
983 | if (options->system_hostfile2 == NULL) | |
984 | options->system_hostfile2 = _PATH_SSH_SYSTEM_HOSTFILE2; | |
985 | if (options->user_hostfile2 == NULL) | |
986 | options->user_hostfile2 = _PATH_SSH_USER_HOSTFILE2; | |
e9a17296 | 987 | if (options->log_level == SYSLOG_LEVEL_NOT_SET) |
3c0ef626 | 988 | options->log_level = SYSLOG_LEVEL_INFO; |
989 | if (options->clear_forwardings == 1) | |
990 | clear_forwardings(options); | |
991 | if (options->no_host_authentication_for_localhost == - 1) | |
992 | options->no_host_authentication_for_localhost = 0; | |
1c14df9e | 993 | if (options->enable_ssh_keysign == -1) |
994 | options->enable_ssh_keysign = 0; | |
70791e56 | 995 | if (options->rekey_limit == -1) |
996 | options->rekey_limit = 0; | |
997 | if (options->verify_host_key_dns == -1) | |
998 | options->verify_host_key_dns = 0; | |
416fd2a8 | 999 | if (options->server_alive_interval == -1) |
1000 | options->server_alive_interval = 0; | |
1001 | if (options->server_alive_count_max == -1) | |
1002 | options->server_alive_count_max = 3; | |
3c0ef626 | 1003 | /* options->proxy_command should not be set by default */ |
1004 | /* options->user will be set in the main program if appropriate */ | |
1005 | /* options->hostname will be set in the main program if appropriate */ | |
1006 | /* options->host_key_alias should not be set by default */ | |
1007 | /* options->preferred_authentications will be set in ssh */ | |
1008 | } |