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1 | /* $OpenBSD: readconf.c,v 1.176 2009/02/12 03:00:56 djm Exp $ */ | |
2 | /* | |
3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> | |
4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
5 | * All rights reserved | |
6 | * Functions for reading the configuration files. | |
7 | * | |
8 | * As far as I am concerned, the code I have written for this software | |
9 | * can be used freely for any purpose. Any derived versions of this | |
10 | * software must be clearly marked as such, and if the derived work is | |
11 | * incompatible with the protocol description in the RFC file, it must be | |
12 | * called by a name other than "ssh" or "Secure Shell". | |
13 | */ | |
14 | ||
15 | #include "includes.h" | |
16 | ||
17 | #include <sys/types.h> | |
18 | #include <sys/stat.h> | |
19 | #include <sys/socket.h> | |
20 | ||
21 | #include <netinet/in.h> | |
22 | ||
23 | #include <ctype.h> | |
24 | #include <errno.h> | |
25 | #include <netdb.h> | |
26 | #include <signal.h> | |
27 | #include <stdarg.h> | |
28 | #include <stdio.h> | |
29 | #include <string.h> | |
30 | #include <unistd.h> | |
31 | ||
32 | #include "xmalloc.h" | |
33 | #include "ssh.h" | |
34 | #include "compat.h" | |
35 | #include "cipher.h" | |
36 | #include "pathnames.h" | |
37 | #include "log.h" | |
38 | #include "key.h" | |
39 | #include "readconf.h" | |
40 | #include "match.h" | |
41 | #include "misc.h" | |
42 | #include "buffer.h" | |
43 | #include "kex.h" | |
44 | #include "mac.h" | |
45 | ||
46 | /* Format of the configuration file: | |
47 | ||
48 | # Configuration data is parsed as follows: | |
49 | # 1. command line options | |
50 | # 2. user-specific file | |
51 | # 3. system-wide file | |
52 | # Any configuration value is only changed the first time it is set. | |
53 | # Thus, host-specific definitions should be at the beginning of the | |
54 | # configuration file, and defaults at the end. | |
55 | ||
56 | # Host-specific declarations. These may override anything above. A single | |
57 | # host may match multiple declarations; these are processed in the order | |
58 | # that they are given in. | |
59 | ||
60 | Host *.ngs.fi ngs.fi | |
61 | User foo | |
62 | ||
63 | Host fake.com | |
64 | HostName another.host.name.real.org | |
65 | User blaah | |
66 | Port 34289 | |
67 | ForwardX11 no | |
68 | ForwardAgent no | |
69 | ||
70 | Host books.com | |
71 | RemoteForward 9999 shadows.cs.hut.fi:9999 | |
72 | Cipher 3des | |
73 | ||
74 | Host fascist.blob.com | |
75 | Port 23123 | |
76 | User tylonen | |
77 | PasswordAuthentication no | |
78 | ||
79 | Host puukko.hut.fi | |
80 | User t35124p | |
81 | ProxyCommand ssh-proxy %h %p | |
82 | ||
83 | Host *.fr | |
84 | PublicKeyAuthentication no | |
85 | ||
86 | Host *.su | |
87 | Cipher none | |
88 | PasswordAuthentication no | |
89 | ||
90 | Host vpn.fake.com | |
91 | Tunnel yes | |
92 | TunnelDevice 3 | |
93 | ||
94 | # Defaults for various options | |
95 | Host * | |
96 | ForwardAgent no | |
97 | ForwardX11 no | |
98 | PasswordAuthentication yes | |
99 | RSAAuthentication yes | |
100 | RhostsRSAAuthentication yes | |
101 | StrictHostKeyChecking yes | |
102 | TcpKeepAlive no | |
103 | IdentityFile ~/.ssh/identity | |
104 | Port 22 | |
105 | EscapeChar ~ | |
106 | ||
107 | */ | |
108 | ||
109 | /* Keyword tokens. */ | |
110 | ||
111 | typedef enum { | |
112 | oBadOption, | |
113 | oForwardAgent, oForwardX11, oForwardX11Trusted, oGatewayPorts, | |
114 | oExitOnForwardFailure, | |
115 | oPasswordAuthentication, oRSAAuthentication, | |
116 | oChallengeResponseAuthentication, oXAuthLocation, | |
117 | oIdentityFile, oHostName, oPort, oCipher, oRemoteForward, oLocalForward, | |
118 | oUser, oHost, oEscapeChar, oRhostsRSAAuthentication, oProxyCommand, | |
119 | oGlobalKnownHostsFile, oUserKnownHostsFile, oConnectionAttempts, | |
120 | oBatchMode, oCheckHostIP, oStrictHostKeyChecking, oCompression, | |
121 | oCompressionLevel, oTCPKeepAlive, oNumberOfPasswordPrompts, | |
122 | oUsePrivilegedPort, oLogLevel, oCiphers, oProtocol, oMacs, | |
123 | oGlobalKnownHostsFile2, oUserKnownHostsFile2, oPubkeyAuthentication, | |
124 | oKbdInteractiveAuthentication, oKbdInteractiveDevices, oHostKeyAlias, | |
125 | oDynamicForward, oPreferredAuthentications, oHostbasedAuthentication, | |
126 | oHostKeyAlgorithms, oBindAddress, oSmartcardDevice, | |
127 | oClearAllForwardings, oNoHostAuthenticationForLocalhost, | |
128 | oEnableSSHKeysign, oRekeyLimit, oVerifyHostKeyDNS, oConnectTimeout, | |
129 | oAddressFamily, oGssAuthentication, oGssDelegateCreds, | |
130 | oGssTrustDns, oGssKeyEx, oGssClientIdentity, oGssRenewalRekey, | |
131 | oServerAliveInterval, oServerAliveCountMax, oIdentitiesOnly, | |
132 | oSendEnv, oControlPath, oControlMaster, oHashKnownHosts, | |
133 | oTunnel, oTunnelDevice, oLocalCommand, oPermitLocalCommand, | |
134 | oVisualHostKey, oZeroKnowledgePasswordAuthentication, | |
135 | oNoneEnabled, oTcpRcvBufPoll, oTcpRcvBuf, oNoneSwitch, oHPNDisabled, | |
136 | oHPNBufferSize, | |
137 | oDeprecated, oUnsupported | |
138 | } OpCodes; | |
139 | ||
140 | /* Textual representations of the tokens. */ | |
141 | ||
142 | static struct { | |
143 | const char *name; | |
144 | OpCodes opcode; | |
145 | } keywords[] = { | |
146 | { "forwardagent", oForwardAgent }, | |
147 | { "forwardx11", oForwardX11 }, | |
148 | { "forwardx11trusted", oForwardX11Trusted }, | |
149 | { "exitonforwardfailure", oExitOnForwardFailure }, | |
150 | { "xauthlocation", oXAuthLocation }, | |
151 | { "gatewayports", oGatewayPorts }, | |
152 | { "useprivilegedport", oUsePrivilegedPort }, | |
153 | { "rhostsauthentication", oDeprecated }, | |
154 | { "passwordauthentication", oPasswordAuthentication }, | |
155 | { "kbdinteractiveauthentication", oKbdInteractiveAuthentication }, | |
156 | { "kbdinteractivedevices", oKbdInteractiveDevices }, | |
157 | { "rsaauthentication", oRSAAuthentication }, | |
158 | { "pubkeyauthentication", oPubkeyAuthentication }, | |
159 | { "dsaauthentication", oPubkeyAuthentication }, /* alias */ | |
160 | { "rhostsrsaauthentication", oRhostsRSAAuthentication }, | |
161 | { "hostbasedauthentication", oHostbasedAuthentication }, | |
162 | { "challengeresponseauthentication", oChallengeResponseAuthentication }, | |
163 | { "skeyauthentication", oChallengeResponseAuthentication }, /* alias */ | |
164 | { "tisauthentication", oChallengeResponseAuthentication }, /* alias */ | |
165 | { "kerberosauthentication", oUnsupported }, | |
166 | { "kerberostgtpassing", oUnsupported }, | |
167 | { "afstokenpassing", oUnsupported }, | |
168 | #if defined(GSSAPI) | |
169 | { "gssapiauthentication", oGssAuthentication }, | |
170 | { "gssapikeyexchange", oGssKeyEx }, | |
171 | { "gssapidelegatecredentials", oGssDelegateCreds }, | |
172 | { "gssapitrustdns", oGssTrustDns }, | |
173 | { "gssapiclientidentity", oGssClientIdentity }, | |
174 | { "gssapirenewalforcesrekey", oGssRenewalRekey }, | |
175 | #else | |
176 | { "gssapiauthentication", oUnsupported }, | |
177 | { "gssapikeyexchange", oUnsupported }, | |
178 | { "gssapidelegatecredentials", oUnsupported }, | |
179 | { "gssapitrustdns", oUnsupported }, | |
180 | { "gssapiclientidentity", oUnsupported }, | |
181 | { "gssapirenewalforcesrekey", oUnsupported }, | |
182 | #endif | |
183 | { "fallbacktorsh", oDeprecated }, | |
184 | { "usersh", oDeprecated }, | |
185 | { "identityfile", oIdentityFile }, | |
186 | { "identityfile2", oIdentityFile }, /* obsolete */ | |
187 | { "identitiesonly", oIdentitiesOnly }, | |
188 | { "hostname", oHostName }, | |
189 | { "hostkeyalias", oHostKeyAlias }, | |
190 | { "proxycommand", oProxyCommand }, | |
191 | { "port", oPort }, | |
192 | { "cipher", oCipher }, | |
193 | { "ciphers", oCiphers }, | |
194 | { "macs", oMacs }, | |
195 | { "protocol", oProtocol }, | |
196 | { "remoteforward", oRemoteForward }, | |
197 | { "localforward", oLocalForward }, | |
198 | { "user", oUser }, | |
199 | { "host", oHost }, | |
200 | { "escapechar", oEscapeChar }, | |
201 | { "globalknownhostsfile", oGlobalKnownHostsFile }, | |
202 | { "globalknownhostsfile2", oGlobalKnownHostsFile2 }, /* obsolete */ | |
203 | { "userknownhostsfile", oUserKnownHostsFile }, | |
204 | { "userknownhostsfile2", oUserKnownHostsFile2 }, /* obsolete */ | |
205 | { "connectionattempts", oConnectionAttempts }, | |
206 | { "batchmode", oBatchMode }, | |
207 | { "checkhostip", oCheckHostIP }, | |
208 | { "stricthostkeychecking", oStrictHostKeyChecking }, | |
209 | { "compression", oCompression }, | |
210 | { "compressionlevel", oCompressionLevel }, | |
211 | { "tcpkeepalive", oTCPKeepAlive }, | |
212 | { "keepalive", oTCPKeepAlive }, /* obsolete */ | |
213 | { "numberofpasswordprompts", oNumberOfPasswordPrompts }, | |
214 | { "loglevel", oLogLevel }, | |
215 | { "dynamicforward", oDynamicForward }, | |
216 | { "preferredauthentications", oPreferredAuthentications }, | |
217 | { "hostkeyalgorithms", oHostKeyAlgorithms }, | |
218 | { "bindaddress", oBindAddress }, | |
219 | #ifdef SMARTCARD | |
220 | { "smartcarddevice", oSmartcardDevice }, | |
221 | #else | |
222 | { "smartcarddevice", oUnsupported }, | |
223 | #endif | |
224 | { "clearallforwardings", oClearAllForwardings }, | |
225 | { "enablesshkeysign", oEnableSSHKeysign }, | |
226 | { "verifyhostkeydns", oVerifyHostKeyDNS }, | |
227 | { "nohostauthenticationforlocalhost", oNoHostAuthenticationForLocalhost }, | |
228 | { "rekeylimit", oRekeyLimit }, | |
229 | { "connecttimeout", oConnectTimeout }, | |
230 | { "addressfamily", oAddressFamily }, | |
231 | { "serveraliveinterval", oServerAliveInterval }, | |
232 | { "serveralivecountmax", oServerAliveCountMax }, | |
233 | { "sendenv", oSendEnv }, | |
234 | { "controlpath", oControlPath }, | |
235 | { "controlmaster", oControlMaster }, | |
236 | { "hashknownhosts", oHashKnownHosts }, | |
237 | { "tunnel", oTunnel }, | |
238 | { "tunneldevice", oTunnelDevice }, | |
239 | { "localcommand", oLocalCommand }, | |
240 | { "permitlocalcommand", oPermitLocalCommand }, | |
241 | { "visualhostkey", oVisualHostKey }, | |
242 | #ifdef JPAKE | |
243 | { "zeroknowledgepasswordauthentication", | |
244 | oZeroKnowledgePasswordAuthentication }, | |
245 | #else | |
246 | { "zeroknowledgepasswordauthentication", oUnsupported }, | |
247 | #endif | |
248 | { "noneenabled", oNoneEnabled }, | |
249 | { "tcprcvbufpoll", oTcpRcvBufPoll }, | |
250 | { "tcprcvbuf", oTcpRcvBuf }, | |
251 | { "noneswitch", oNoneSwitch }, | |
252 | { "hpndisabled", oHPNDisabled }, | |
253 | { "hpnbuffersize", oHPNBufferSize }, | |
254 | { NULL, oBadOption } | |
255 | }; | |
256 | ||
257 | /* | |
258 | * Adds a local TCP/IP port forward to options. Never returns if there is an | |
259 | * error. | |
260 | */ | |
261 | ||
262 | void | |
263 | add_local_forward(Options *options, const Forward *newfwd) | |
264 | { | |
265 | Forward *fwd; | |
266 | #ifndef NO_IPPORT_RESERVED_CONCEPT | |
267 | extern uid_t original_real_uid; | |
268 | if (newfwd->listen_port < IPPORT_RESERVED && original_real_uid != 0) | |
269 | fatal("Privileged ports can only be forwarded by root."); | |
270 | #endif | |
271 | if (options->num_local_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
272 | fatal("Too many local forwards (max %d).", SSH_MAX_FORWARDS_PER_DIRECTION); | |
273 | fwd = &options->local_forwards[options->num_local_forwards++]; | |
274 | ||
275 | fwd->listen_host = newfwd->listen_host; | |
276 | fwd->listen_port = newfwd->listen_port; | |
277 | fwd->connect_host = newfwd->connect_host; | |
278 | fwd->connect_port = newfwd->connect_port; | |
279 | } | |
280 | ||
281 | /* | |
282 | * Adds a remote TCP/IP port forward to options. Never returns if there is | |
283 | * an error. | |
284 | */ | |
285 | ||
286 | void | |
287 | add_remote_forward(Options *options, const Forward *newfwd) | |
288 | { | |
289 | Forward *fwd; | |
290 | if (options->num_remote_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
291 | fatal("Too many remote forwards (max %d).", | |
292 | SSH_MAX_FORWARDS_PER_DIRECTION); | |
293 | fwd = &options->remote_forwards[options->num_remote_forwards++]; | |
294 | ||
295 | fwd->listen_host = newfwd->listen_host; | |
296 | fwd->listen_port = newfwd->listen_port; | |
297 | fwd->connect_host = newfwd->connect_host; | |
298 | fwd->connect_port = newfwd->connect_port; | |
299 | } | |
300 | ||
301 | static void | |
302 | clear_forwardings(Options *options) | |
303 | { | |
304 | int i; | |
305 | ||
306 | for (i = 0; i < options->num_local_forwards; i++) { | |
307 | if (options->local_forwards[i].listen_host != NULL) | |
308 | xfree(options->local_forwards[i].listen_host); | |
309 | xfree(options->local_forwards[i].connect_host); | |
310 | } | |
311 | options->num_local_forwards = 0; | |
312 | for (i = 0; i < options->num_remote_forwards; i++) { | |
313 | if (options->remote_forwards[i].listen_host != NULL) | |
314 | xfree(options->remote_forwards[i].listen_host); | |
315 | xfree(options->remote_forwards[i].connect_host); | |
316 | } | |
317 | options->num_remote_forwards = 0; | |
318 | options->tun_open = SSH_TUNMODE_NO; | |
319 | } | |
320 | ||
321 | /* | |
322 | * Returns the number of the token pointed to by cp or oBadOption. | |
323 | */ | |
324 | ||
325 | static OpCodes | |
326 | parse_token(const char *cp, const char *filename, int linenum) | |
327 | { | |
328 | u_int i; | |
329 | ||
330 | for (i = 0; keywords[i].name; i++) | |
331 | if (strcasecmp(cp, keywords[i].name) == 0) | |
332 | return keywords[i].opcode; | |
333 | ||
334 | error("%s: line %d: Bad configuration option: %s", | |
335 | filename, linenum, cp); | |
336 | return oBadOption; | |
337 | } | |
338 | ||
339 | /* | |
340 | * Processes a single option line as used in the configuration files. This | |
341 | * only sets those values that have not already been set. | |
342 | */ | |
343 | #define WHITESPACE " \t\r\n" | |
344 | ||
345 | int | |
346 | process_config_line(Options *options, const char *host, | |
347 | char *line, const char *filename, int linenum, | |
348 | int *activep) | |
349 | { | |
350 | char *s, **charptr, *endofnumber, *keyword, *arg, *arg2, fwdarg[256]; | |
351 | int opcode, *intptr, value, value2, scale; | |
352 | LogLevel *log_level_ptr; | |
353 | long long orig, val64; | |
354 | size_t len; | |
355 | Forward fwd; | |
356 | ||
357 | /* Strip trailing whitespace */ | |
358 | for (len = strlen(line) - 1; len > 0; len--) { | |
359 | if (strchr(WHITESPACE, line[len]) == NULL) | |
360 | break; | |
361 | line[len] = '\0'; | |
362 | } | |
363 | ||
364 | s = line; | |
365 | /* Get the keyword. (Each line is supposed to begin with a keyword). */ | |
366 | if ((keyword = strdelim(&s)) == NULL) | |
367 | return 0; | |
368 | /* Ignore leading whitespace. */ | |
369 | if (*keyword == '\0') | |
370 | keyword = strdelim(&s); | |
371 | if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#') | |
372 | return 0; | |
373 | ||
374 | opcode = parse_token(keyword, filename, linenum); | |
375 | ||
376 | switch (opcode) { | |
377 | case oBadOption: | |
378 | /* don't panic, but count bad options */ | |
379 | return -1; | |
380 | /* NOTREACHED */ | |
381 | case oConnectTimeout: | |
382 | intptr = &options->connection_timeout; | |
383 | parse_time: | |
384 | arg = strdelim(&s); | |
385 | if (!arg || *arg == '\0') | |
386 | fatal("%s line %d: missing time value.", | |
387 | filename, linenum); | |
388 | if ((value = convtime(arg)) == -1) | |
389 | fatal("%s line %d: invalid time value.", | |
390 | filename, linenum); | |
391 | if (*activep && *intptr == -1) | |
392 | *intptr = value; | |
393 | break; | |
394 | ||
395 | case oForwardAgent: | |
396 | intptr = &options->forward_agent; | |
397 | parse_flag: | |
398 | arg = strdelim(&s); | |
399 | if (!arg || *arg == '\0') | |
400 | fatal("%.200s line %d: Missing yes/no argument.", filename, linenum); | |
401 | value = 0; /* To avoid compiler warning... */ | |
402 | if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0) | |
403 | value = 1; | |
404 | else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0) | |
405 | value = 0; | |
406 | else | |
407 | fatal("%.200s line %d: Bad yes/no argument.", filename, linenum); | |
408 | if (*activep && *intptr == -1) | |
409 | *intptr = value; | |
410 | break; | |
411 | ||
412 | case oForwardX11: | |
413 | intptr = &options->forward_x11; | |
414 | goto parse_flag; | |
415 | ||
416 | case oForwardX11Trusted: | |
417 | intptr = &options->forward_x11_trusted; | |
418 | goto parse_flag; | |
419 | ||
420 | case oGatewayPorts: | |
421 | intptr = &options->gateway_ports; | |
422 | goto parse_flag; | |
423 | ||
424 | case oExitOnForwardFailure: | |
425 | intptr = &options->exit_on_forward_failure; | |
426 | goto parse_flag; | |
427 | ||
428 | case oUsePrivilegedPort: | |
429 | intptr = &options->use_privileged_port; | |
430 | goto parse_flag; | |
431 | ||
432 | case oPasswordAuthentication: | |
433 | intptr = &options->password_authentication; | |
434 | goto parse_flag; | |
435 | ||
436 | case oZeroKnowledgePasswordAuthentication: | |
437 | intptr = &options->zero_knowledge_password_authentication; | |
438 | goto parse_flag; | |
439 | ||
440 | case oKbdInteractiveAuthentication: | |
441 | intptr = &options->kbd_interactive_authentication; | |
442 | goto parse_flag; | |
443 | ||
444 | case oKbdInteractiveDevices: | |
445 | charptr = &options->kbd_interactive_devices; | |
446 | goto parse_string; | |
447 | ||
448 | case oPubkeyAuthentication: | |
449 | intptr = &options->pubkey_authentication; | |
450 | goto parse_flag; | |
451 | ||
452 | case oRSAAuthentication: | |
453 | intptr = &options->rsa_authentication; | |
454 | goto parse_flag; | |
455 | ||
456 | case oRhostsRSAAuthentication: | |
457 | intptr = &options->rhosts_rsa_authentication; | |
458 | goto parse_flag; | |
459 | ||
460 | case oHostbasedAuthentication: | |
461 | intptr = &options->hostbased_authentication; | |
462 | goto parse_flag; | |
463 | ||
464 | case oChallengeResponseAuthentication: | |
465 | intptr = &options->challenge_response_authentication; | |
466 | goto parse_flag; | |
467 | ||
468 | case oGssAuthentication: | |
469 | intptr = &options->gss_authentication; | |
470 | goto parse_flag; | |
471 | ||
472 | case oGssKeyEx: | |
473 | intptr = &options->gss_keyex; | |
474 | goto parse_flag; | |
475 | ||
476 | case oGssDelegateCreds: | |
477 | intptr = &options->gss_deleg_creds; | |
478 | goto parse_flag; | |
479 | ||
480 | case oGssTrustDns: | |
481 | intptr = &options->gss_trust_dns; | |
482 | goto parse_flag; | |
483 | ||
484 | case oGssClientIdentity: | |
485 | charptr = &options->gss_client_identity; | |
486 | goto parse_string; | |
487 | ||
488 | case oGssRenewalRekey: | |
489 | intptr = &options->gss_renewal_rekey; | |
490 | goto parse_flag; | |
491 | ||
492 | case oBatchMode: | |
493 | intptr = &options->batch_mode; | |
494 | goto parse_flag; | |
495 | ||
496 | case oCheckHostIP: | |
497 | intptr = &options->check_host_ip; | |
498 | goto parse_flag; | |
499 | ||
500 | case oNoneEnabled: | |
501 | intptr = &options->none_enabled; | |
502 | goto parse_flag; | |
503 | ||
504 | /* we check to see if the command comes from the */ | |
505 | /* command line or not. If it does then enable it */ | |
506 | /* otherwise fail. NONE should never be a default configuration */ | |
507 | case oNoneSwitch: | |
508 | if(strcmp(filename,"command-line")==0) | |
509 | { | |
510 | intptr = &options->none_switch; | |
511 | goto parse_flag; | |
512 | } else { | |
513 | error("NoneSwitch is found in %.200s.\nYou may only use this configuration option from the command line", filename); | |
514 | error("Continuing..."); | |
515 | debug("NoneSwitch directive found in %.200s.", filename); | |
516 | return 0; | |
517 | } | |
518 | ||
519 | case oHPNDisabled: | |
520 | intptr = &options->hpn_disabled; | |
521 | goto parse_flag; | |
522 | ||
523 | case oHPNBufferSize: | |
524 | intptr = &options->hpn_buffer_size; | |
525 | goto parse_int; | |
526 | ||
527 | case oTcpRcvBufPoll: | |
528 | intptr = &options->tcp_rcv_buf_poll; | |
529 | goto parse_flag; | |
530 | ||
531 | case oVerifyHostKeyDNS: | |
532 | intptr = &options->verify_host_key_dns; | |
533 | goto parse_yesnoask; | |
534 | ||
535 | case oStrictHostKeyChecking: | |
536 | intptr = &options->strict_host_key_checking; | |
537 | parse_yesnoask: | |
538 | arg = strdelim(&s); | |
539 | if (!arg || *arg == '\0') | |
540 | fatal("%.200s line %d: Missing yes/no/ask argument.", | |
541 | filename, linenum); | |
542 | value = 0; /* To avoid compiler warning... */ | |
543 | if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0) | |
544 | value = 1; | |
545 | else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0) | |
546 | value = 0; | |
547 | else if (strcmp(arg, "ask") == 0) | |
548 | value = 2; | |
549 | else | |
550 | fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum); | |
551 | if (*activep && *intptr == -1) | |
552 | *intptr = value; | |
553 | break; | |
554 | ||
555 | case oCompression: | |
556 | intptr = &options->compression; | |
557 | goto parse_flag; | |
558 | ||
559 | case oTCPKeepAlive: | |
560 | intptr = &options->tcp_keep_alive; | |
561 | goto parse_flag; | |
562 | ||
563 | case oNoHostAuthenticationForLocalhost: | |
564 | intptr = &options->no_host_authentication_for_localhost; | |
565 | goto parse_flag; | |
566 | ||
567 | case oNumberOfPasswordPrompts: | |
568 | intptr = &options->number_of_password_prompts; | |
569 | goto parse_int; | |
570 | ||
571 | case oCompressionLevel: | |
572 | intptr = &options->compression_level; | |
573 | goto parse_int; | |
574 | ||
575 | case oRekeyLimit: | |
576 | arg = strdelim(&s); | |
577 | if (!arg || *arg == '\0') | |
578 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
579 | if (arg[0] < '0' || arg[0] > '9') | |
580 | fatal("%.200s line %d: Bad number.", filename, linenum); | |
581 | orig = val64 = strtoll(arg, &endofnumber, 10); | |
582 | if (arg == endofnumber) | |
583 | fatal("%.200s line %d: Bad number.", filename, linenum); | |
584 | switch (toupper(*endofnumber)) { | |
585 | case '\0': | |
586 | scale = 1; | |
587 | break; | |
588 | case 'K': | |
589 | scale = 1<<10; | |
590 | break; | |
591 | case 'M': | |
592 | scale = 1<<20; | |
593 | break; | |
594 | case 'G': | |
595 | scale = 1<<30; | |
596 | break; | |
597 | default: | |
598 | fatal("%.200s line %d: Invalid RekeyLimit suffix", | |
599 | filename, linenum); | |
600 | } | |
601 | val64 *= scale; | |
602 | /* detect integer wrap and too-large limits */ | |
603 | if ((val64 / scale) != orig || val64 > UINT_MAX) | |
604 | fatal("%.200s line %d: RekeyLimit too large", | |
605 | filename, linenum); | |
606 | if (val64 < 16) | |
607 | fatal("%.200s line %d: RekeyLimit too small", | |
608 | filename, linenum); | |
609 | if (*activep && options->rekey_limit == -1) | |
610 | options->rekey_limit = (u_int32_t)val64; | |
611 | break; | |
612 | ||
613 | case oIdentityFile: | |
614 | arg = strdelim(&s); | |
615 | if (!arg || *arg == '\0') | |
616 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
617 | if (*activep) { | |
618 | intptr = &options->num_identity_files; | |
619 | if (*intptr >= SSH_MAX_IDENTITY_FILES) | |
620 | fatal("%.200s line %d: Too many identity files specified (max %d).", | |
621 | filename, linenum, SSH_MAX_IDENTITY_FILES); | |
622 | charptr = &options->identity_files[*intptr]; | |
623 | *charptr = xstrdup(arg); | |
624 | *intptr = *intptr + 1; | |
625 | } | |
626 | break; | |
627 | ||
628 | case oXAuthLocation: | |
629 | charptr=&options->xauth_location; | |
630 | goto parse_string; | |
631 | ||
632 | case oUser: | |
633 | charptr = &options->user; | |
634 | parse_string: | |
635 | arg = strdelim(&s); | |
636 | if (!arg || *arg == '\0') | |
637 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
638 | if (*activep && *charptr == NULL) | |
639 | *charptr = xstrdup(arg); | |
640 | break; | |
641 | ||
642 | case oGlobalKnownHostsFile: | |
643 | charptr = &options->system_hostfile; | |
644 | goto parse_string; | |
645 | ||
646 | case oUserKnownHostsFile: | |
647 | charptr = &options->user_hostfile; | |
648 | goto parse_string; | |
649 | ||
650 | case oGlobalKnownHostsFile2: | |
651 | charptr = &options->system_hostfile2; | |
652 | goto parse_string; | |
653 | ||
654 | case oUserKnownHostsFile2: | |
655 | charptr = &options->user_hostfile2; | |
656 | goto parse_string; | |
657 | ||
658 | case oHostName: | |
659 | charptr = &options->hostname; | |
660 | goto parse_string; | |
661 | ||
662 | case oHostKeyAlias: | |
663 | charptr = &options->host_key_alias; | |
664 | goto parse_string; | |
665 | ||
666 | case oPreferredAuthentications: | |
667 | charptr = &options->preferred_authentications; | |
668 | goto parse_string; | |
669 | ||
670 | case oBindAddress: | |
671 | charptr = &options->bind_address; | |
672 | goto parse_string; | |
673 | ||
674 | case oSmartcardDevice: | |
675 | charptr = &options->smartcard_device; | |
676 | goto parse_string; | |
677 | ||
678 | case oProxyCommand: | |
679 | charptr = &options->proxy_command; | |
680 | parse_command: | |
681 | if (s == NULL) | |
682 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
683 | len = strspn(s, WHITESPACE "="); | |
684 | if (*activep && *charptr == NULL) | |
685 | *charptr = xstrdup(s + len); | |
686 | return 0; | |
687 | ||
688 | case oPort: | |
689 | intptr = &options->port; | |
690 | parse_int: | |
691 | arg = strdelim(&s); | |
692 | if (!arg || *arg == '\0') | |
693 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
694 | if (arg[0] < '0' || arg[0] > '9') | |
695 | fatal("%.200s line %d: Bad number.", filename, linenum); | |
696 | ||
697 | /* Octal, decimal, or hex format? */ | |
698 | value = strtol(arg, &endofnumber, 0); | |
699 | if (arg == endofnumber) | |
700 | fatal("%.200s line %d: Bad number.", filename, linenum); | |
701 | if (*activep && *intptr == -1) | |
702 | *intptr = value; | |
703 | break; | |
704 | ||
705 | case oConnectionAttempts: | |
706 | intptr = &options->connection_attempts; | |
707 | goto parse_int; | |
708 | ||
709 | case oTcpRcvBuf: | |
710 | intptr = &options->tcp_rcv_buf; | |
711 | goto parse_int; | |
712 | ||
713 | case oCipher: | |
714 | intptr = &options->cipher; | |
715 | arg = strdelim(&s); | |
716 | if (!arg || *arg == '\0') | |
717 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
718 | value = cipher_number(arg); | |
719 | if (value == -1) | |
720 | fatal("%.200s line %d: Bad cipher '%s'.", | |
721 | filename, linenum, arg ? arg : "<NONE>"); | |
722 | if (*activep && *intptr == -1) | |
723 | *intptr = value; | |
724 | break; | |
725 | ||
726 | case oCiphers: | |
727 | arg = strdelim(&s); | |
728 | if (!arg || *arg == '\0') | |
729 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
730 | if (!ciphers_valid(arg)) | |
731 | fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.", | |
732 | filename, linenum, arg ? arg : "<NONE>"); | |
733 | if (*activep && options->ciphers == NULL) | |
734 | options->ciphers = xstrdup(arg); | |
735 | break; | |
736 | ||
737 | case oMacs: | |
738 | arg = strdelim(&s); | |
739 | if (!arg || *arg == '\0') | |
740 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
741 | if (!mac_valid(arg)) | |
742 | fatal("%.200s line %d: Bad SSH2 Mac spec '%s'.", | |
743 | filename, linenum, arg ? arg : "<NONE>"); | |
744 | if (*activep && options->macs == NULL) | |
745 | options->macs = xstrdup(arg); | |
746 | break; | |
747 | ||
748 | case oHostKeyAlgorithms: | |
749 | arg = strdelim(&s); | |
750 | if (!arg || *arg == '\0') | |
751 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
752 | if (!key_names_valid2(arg)) | |
753 | fatal("%.200s line %d: Bad protocol 2 host key algorithms '%s'.", | |
754 | filename, linenum, arg ? arg : "<NONE>"); | |
755 | if (*activep && options->hostkeyalgorithms == NULL) | |
756 | options->hostkeyalgorithms = xstrdup(arg); | |
757 | break; | |
758 | ||
759 | case oProtocol: | |
760 | intptr = &options->protocol; | |
761 | arg = strdelim(&s); | |
762 | if (!arg || *arg == '\0') | |
763 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
764 | value = proto_spec(arg); | |
765 | if (value == SSH_PROTO_UNKNOWN) | |
766 | fatal("%.200s line %d: Bad protocol spec '%s'.", | |
767 | filename, linenum, arg ? arg : "<NONE>"); | |
768 | if (*activep && *intptr == SSH_PROTO_UNKNOWN) | |
769 | *intptr = value; | |
770 | break; | |
771 | ||
772 | case oLogLevel: | |
773 | log_level_ptr = &options->log_level; | |
774 | arg = strdelim(&s); | |
775 | value = log_level_number(arg); | |
776 | if (value == SYSLOG_LEVEL_NOT_SET) | |
777 | fatal("%.200s line %d: unsupported log level '%s'", | |
778 | filename, linenum, arg ? arg : "<NONE>"); | |
779 | if (*activep && *log_level_ptr == SYSLOG_LEVEL_NOT_SET) | |
780 | *log_level_ptr = (LogLevel) value; | |
781 | break; | |
782 | ||
783 | case oLocalForward: | |
784 | case oRemoteForward: | |
785 | case oDynamicForward: | |
786 | arg = strdelim(&s); | |
787 | if (arg == NULL || *arg == '\0') | |
788 | fatal("%.200s line %d: Missing port argument.", | |
789 | filename, linenum); | |
790 | ||
791 | if (opcode == oLocalForward || | |
792 | opcode == oRemoteForward) { | |
793 | arg2 = strdelim(&s); | |
794 | if (arg2 == NULL || *arg2 == '\0') | |
795 | fatal("%.200s line %d: Missing target argument.", | |
796 | filename, linenum); | |
797 | ||
798 | /* construct a string for parse_forward */ | |
799 | snprintf(fwdarg, sizeof(fwdarg), "%s:%s", arg, arg2); | |
800 | } else if (opcode == oDynamicForward) { | |
801 | strlcpy(fwdarg, arg, sizeof(fwdarg)); | |
802 | } | |
803 | ||
804 | if (parse_forward(&fwd, fwdarg, | |
805 | opcode == oDynamicForward ? 1 : 0, | |
806 | opcode == oRemoteForward ? 1 : 0) == 0) | |
807 | fatal("%.200s line %d: Bad forwarding specification.", | |
808 | filename, linenum); | |
809 | ||
810 | if (*activep) { | |
811 | if (opcode == oLocalForward || | |
812 | opcode == oDynamicForward) | |
813 | add_local_forward(options, &fwd); | |
814 | else if (opcode == oRemoteForward) | |
815 | add_remote_forward(options, &fwd); | |
816 | } | |
817 | break; | |
818 | ||
819 | case oClearAllForwardings: | |
820 | intptr = &options->clear_forwardings; | |
821 | goto parse_flag; | |
822 | ||
823 | case oHost: | |
824 | *activep = 0; | |
825 | while ((arg = strdelim(&s)) != NULL && *arg != '\0') | |
826 | if (match_pattern(host, arg)) { | |
827 | debug("Applying options for %.100s", arg); | |
828 | *activep = 1; | |
829 | break; | |
830 | } | |
831 | /* Avoid garbage check below, as strdelim is done. */ | |
832 | return 0; | |
833 | ||
834 | case oEscapeChar: | |
835 | intptr = &options->escape_char; | |
836 | arg = strdelim(&s); | |
837 | if (!arg || *arg == '\0') | |
838 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
839 | if (arg[0] == '^' && arg[2] == 0 && | |
840 | (u_char) arg[1] >= 64 && (u_char) arg[1] < 128) | |
841 | value = (u_char) arg[1] & 31; | |
842 | else if (strlen(arg) == 1) | |
843 | value = (u_char) arg[0]; | |
844 | else if (strcmp(arg, "none") == 0) | |
845 | value = SSH_ESCAPECHAR_NONE; | |
846 | else { | |
847 | fatal("%.200s line %d: Bad escape character.", | |
848 | filename, linenum); | |
849 | /* NOTREACHED */ | |
850 | value = 0; /* Avoid compiler warning. */ | |
851 | } | |
852 | if (*activep && *intptr == -1) | |
853 | *intptr = value; | |
854 | break; | |
855 | ||
856 | case oAddressFamily: | |
857 | arg = strdelim(&s); | |
858 | if (!arg || *arg == '\0') | |
859 | fatal("%s line %d: missing address family.", | |
860 | filename, linenum); | |
861 | intptr = &options->address_family; | |
862 | if (strcasecmp(arg, "inet") == 0) | |
863 | value = AF_INET; | |
864 | else if (strcasecmp(arg, "inet6") == 0) | |
865 | value = AF_INET6; | |
866 | else if (strcasecmp(arg, "any") == 0) | |
867 | value = AF_UNSPEC; | |
868 | else | |
869 | fatal("Unsupported AddressFamily \"%s\"", arg); | |
870 | if (*activep && *intptr == -1) | |
871 | *intptr = value; | |
872 | break; | |
873 | ||
874 | case oEnableSSHKeysign: | |
875 | intptr = &options->enable_ssh_keysign; | |
876 | goto parse_flag; | |
877 | ||
878 | case oIdentitiesOnly: | |
879 | intptr = &options->identities_only; | |
880 | goto parse_flag; | |
881 | ||
882 | case oServerAliveInterval: | |
883 | intptr = &options->server_alive_interval; | |
884 | goto parse_time; | |
885 | ||
886 | case oServerAliveCountMax: | |
887 | intptr = &options->server_alive_count_max; | |
888 | goto parse_int; | |
889 | ||
890 | case oSendEnv: | |
891 | while ((arg = strdelim(&s)) != NULL && *arg != '\0') { | |
892 | if (strchr(arg, '=') != NULL) | |
893 | fatal("%s line %d: Invalid environment name.", | |
894 | filename, linenum); | |
895 | if (!*activep) | |
896 | continue; | |
897 | if (options->num_send_env >= MAX_SEND_ENV) | |
898 | fatal("%s line %d: too many send env.", | |
899 | filename, linenum); | |
900 | options->send_env[options->num_send_env++] = | |
901 | xstrdup(arg); | |
902 | } | |
903 | break; | |
904 | ||
905 | case oControlPath: | |
906 | charptr = &options->control_path; | |
907 | goto parse_string; | |
908 | ||
909 | case oControlMaster: | |
910 | intptr = &options->control_master; | |
911 | arg = strdelim(&s); | |
912 | if (!arg || *arg == '\0') | |
913 | fatal("%.200s line %d: Missing ControlMaster argument.", | |
914 | filename, linenum); | |
915 | value = 0; /* To avoid compiler warning... */ | |
916 | if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0) | |
917 | value = SSHCTL_MASTER_YES; | |
918 | else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0) | |
919 | value = SSHCTL_MASTER_NO; | |
920 | else if (strcmp(arg, "auto") == 0) | |
921 | value = SSHCTL_MASTER_AUTO; | |
922 | else if (strcmp(arg, "ask") == 0) | |
923 | value = SSHCTL_MASTER_ASK; | |
924 | else if (strcmp(arg, "autoask") == 0) | |
925 | value = SSHCTL_MASTER_AUTO_ASK; | |
926 | else | |
927 | fatal("%.200s line %d: Bad ControlMaster argument.", | |
928 | filename, linenum); | |
929 | if (*activep && *intptr == -1) | |
930 | *intptr = value; | |
931 | break; | |
932 | ||
933 | case oHashKnownHosts: | |
934 | intptr = &options->hash_known_hosts; | |
935 | goto parse_flag; | |
936 | ||
937 | case oTunnel: | |
938 | intptr = &options->tun_open; | |
939 | arg = strdelim(&s); | |
940 | if (!arg || *arg == '\0') | |
941 | fatal("%s line %d: Missing yes/point-to-point/" | |
942 | "ethernet/no argument.", filename, linenum); | |
943 | value = 0; /* silence compiler */ | |
944 | if (strcasecmp(arg, "ethernet") == 0) | |
945 | value = SSH_TUNMODE_ETHERNET; | |
946 | else if (strcasecmp(arg, "point-to-point") == 0) | |
947 | value = SSH_TUNMODE_POINTOPOINT; | |
948 | else if (strcasecmp(arg, "yes") == 0) | |
949 | value = SSH_TUNMODE_DEFAULT; | |
950 | else if (strcasecmp(arg, "no") == 0) | |
951 | value = SSH_TUNMODE_NO; | |
952 | else | |
953 | fatal("%s line %d: Bad yes/point-to-point/ethernet/" | |
954 | "no argument: %s", filename, linenum, arg); | |
955 | if (*activep) | |
956 | *intptr = value; | |
957 | break; | |
958 | ||
959 | case oTunnelDevice: | |
960 | arg = strdelim(&s); | |
961 | if (!arg || *arg == '\0') | |
962 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
963 | value = a2tun(arg, &value2); | |
964 | if (value == SSH_TUNID_ERR) | |
965 | fatal("%.200s line %d: Bad tun device.", filename, linenum); | |
966 | if (*activep) { | |
967 | options->tun_local = value; | |
968 | options->tun_remote = value2; | |
969 | } | |
970 | break; | |
971 | ||
972 | case oLocalCommand: | |
973 | charptr = &options->local_command; | |
974 | goto parse_command; | |
975 | ||
976 | case oPermitLocalCommand: | |
977 | intptr = &options->permit_local_command; | |
978 | goto parse_flag; | |
979 | ||
980 | case oVisualHostKey: | |
981 | intptr = &options->visual_host_key; | |
982 | goto parse_flag; | |
983 | ||
984 | case oDeprecated: | |
985 | debug("%s line %d: Deprecated option \"%s\"", | |
986 | filename, linenum, keyword); | |
987 | return 0; | |
988 | ||
989 | case oUnsupported: | |
990 | error("%s line %d: Unsupported option \"%s\"", | |
991 | filename, linenum, keyword); | |
992 | return 0; | |
993 | ||
994 | default: | |
995 | fatal("process_config_line: Unimplemented opcode %d", opcode); | |
996 | } | |
997 | ||
998 | /* Check that there is no garbage at end of line. */ | |
999 | if ((arg = strdelim(&s)) != NULL && *arg != '\0') { | |
1000 | fatal("%.200s line %d: garbage at end of line; \"%.200s\".", | |
1001 | filename, linenum, arg); | |
1002 | } | |
1003 | return 0; | |
1004 | } | |
1005 | ||
1006 | ||
1007 | /* | |
1008 | * Reads the config file and modifies the options accordingly. Options | |
1009 | * should already be initialized before this call. This never returns if | |
1010 | * there is an error. If the file does not exist, this returns 0. | |
1011 | */ | |
1012 | ||
1013 | int | |
1014 | read_config_file(const char *filename, const char *host, Options *options, | |
1015 | int checkperm) | |
1016 | { | |
1017 | FILE *f; | |
1018 | char line[1024]; | |
1019 | int active, linenum; | |
1020 | int bad_options = 0; | |
1021 | ||
1022 | if ((f = fopen(filename, "r")) == NULL) | |
1023 | return 0; | |
1024 | ||
1025 | if (checkperm) { | |
1026 | struct stat sb; | |
1027 | ||
1028 | if (fstat(fileno(f), &sb) == -1) | |
1029 | fatal("fstat %s: %s", filename, strerror(errno)); | |
1030 | if (((sb.st_uid != 0 && sb.st_uid != getuid()) || | |
1031 | (sb.st_mode & 022) != 0)) | |
1032 | fatal("Bad owner or permissions on %s", filename); | |
1033 | } | |
1034 | ||
1035 | debug("Reading configuration data %.200s", filename); | |
1036 | ||
1037 | /* | |
1038 | * Mark that we are now processing the options. This flag is turned | |
1039 | * on/off by Host specifications. | |
1040 | */ | |
1041 | active = 1; | |
1042 | linenum = 0; | |
1043 | while (fgets(line, sizeof(line), f)) { | |
1044 | /* Update line number counter. */ | |
1045 | linenum++; | |
1046 | if (process_config_line(options, host, line, filename, linenum, &active) != 0) | |
1047 | bad_options++; | |
1048 | } | |
1049 | fclose(f); | |
1050 | if (bad_options > 0) | |
1051 | fatal("%s: terminating, %d bad configuration options", | |
1052 | filename, bad_options); | |
1053 | return 1; | |
1054 | } | |
1055 | ||
1056 | /* | |
1057 | * Initializes options to special values that indicate that they have not yet | |
1058 | * been set. Read_config_file will only set options with this value. Options | |
1059 | * are processed in the following order: command line, user config file, | |
1060 | * system config file. Last, fill_default_options is called. | |
1061 | */ | |
1062 | ||
1063 | void | |
1064 | initialize_options(Options * options) | |
1065 | { | |
1066 | memset(options, 'X', sizeof(*options)); | |
1067 | options->forward_agent = -1; | |
1068 | options->forward_x11 = -1; | |
1069 | options->forward_x11_trusted = -1; | |
1070 | options->exit_on_forward_failure = -1; | |
1071 | options->xauth_location = NULL; | |
1072 | options->gateway_ports = -1; | |
1073 | options->use_privileged_port = -1; | |
1074 | options->rsa_authentication = -1; | |
1075 | options->pubkey_authentication = -1; | |
1076 | options->challenge_response_authentication = -1; | |
1077 | options->gss_authentication = -1; | |
1078 | options->gss_keyex = -1; | |
1079 | options->gss_deleg_creds = -1; | |
1080 | options->gss_trust_dns = -1; | |
1081 | options->gss_renewal_rekey = -1; | |
1082 | options->gss_client_identity = NULL; | |
1083 | options->password_authentication = -1; | |
1084 | options->kbd_interactive_authentication = -1; | |
1085 | options->kbd_interactive_devices = NULL; | |
1086 | options->rhosts_rsa_authentication = -1; | |
1087 | options->hostbased_authentication = -1; | |
1088 | options->batch_mode = -1; | |
1089 | options->check_host_ip = -1; | |
1090 | options->strict_host_key_checking = -1; | |
1091 | options->compression = -1; | |
1092 | options->tcp_keep_alive = -1; | |
1093 | options->compression_level = -1; | |
1094 | options->port = -1; | |
1095 | options->address_family = -1; | |
1096 | options->connection_attempts = -1; | |
1097 | options->connection_timeout = -1; | |
1098 | options->number_of_password_prompts = -1; | |
1099 | options->cipher = -1; | |
1100 | options->ciphers = NULL; | |
1101 | options->macs = NULL; | |
1102 | options->hostkeyalgorithms = NULL; | |
1103 | options->protocol = SSH_PROTO_UNKNOWN; | |
1104 | options->num_identity_files = 0; | |
1105 | options->hostname = NULL; | |
1106 | options->host_key_alias = NULL; | |
1107 | options->proxy_command = NULL; | |
1108 | options->user = NULL; | |
1109 | options->escape_char = -1; | |
1110 | options->system_hostfile = NULL; | |
1111 | options->user_hostfile = NULL; | |
1112 | options->system_hostfile2 = NULL; | |
1113 | options->user_hostfile2 = NULL; | |
1114 | options->num_local_forwards = 0; | |
1115 | options->num_remote_forwards = 0; | |
1116 | options->clear_forwardings = -1; | |
1117 | options->log_level = SYSLOG_LEVEL_NOT_SET; | |
1118 | options->preferred_authentications = NULL; | |
1119 | options->bind_address = NULL; | |
1120 | options->smartcard_device = NULL; | |
1121 | options->enable_ssh_keysign = - 1; | |
1122 | options->no_host_authentication_for_localhost = - 1; | |
1123 | options->identities_only = - 1; | |
1124 | options->rekey_limit = - 1; | |
1125 | options->verify_host_key_dns = -1; | |
1126 | options->server_alive_interval = -1; | |
1127 | options->server_alive_count_max = -1; | |
1128 | options->num_send_env = 0; | |
1129 | options->control_path = NULL; | |
1130 | options->control_master = -1; | |
1131 | options->hash_known_hosts = -1; | |
1132 | options->tun_open = -1; | |
1133 | options->tun_local = -1; | |
1134 | options->tun_remote = -1; | |
1135 | options->local_command = NULL; | |
1136 | options->permit_local_command = -1; | |
1137 | options->none_switch = -1; | |
1138 | options->none_enabled = -1; | |
1139 | options->hpn_disabled = -1; | |
1140 | options->hpn_buffer_size = -1; | |
1141 | options->tcp_rcv_buf_poll = -1; | |
1142 | options->tcp_rcv_buf = -1; | |
1143 | options->visual_host_key = -1; | |
1144 | options->none_switch = -1; | |
1145 | options->none_enabled = -1; | |
1146 | options->hpn_disabled = -1; | |
1147 | options->hpn_buffer_size = -1; | |
1148 | options->tcp_rcv_buf_poll = -1; | |
1149 | options->tcp_rcv_buf = -1; | |
1150 | options->zero_knowledge_password_authentication = -1; | |
1151 | options->none_switch = -1; | |
1152 | options->none_enabled = -1; | |
1153 | options->hpn_disabled = -1; | |
1154 | options->hpn_buffer_size = -1; | |
1155 | options->tcp_rcv_buf_poll = -1; | |
1156 | options->tcp_rcv_buf = -1; | |
1157 | } | |
1158 | ||
1159 | /* | |
1160 | * Called after processing other sources of option data, this fills those | |
1161 | * options for which no value has been specified with their default values. | |
1162 | */ | |
1163 | ||
1164 | void | |
1165 | fill_default_options(Options * options) | |
1166 | { | |
1167 | int len; | |
1168 | ||
1169 | if (options->forward_agent == -1) | |
1170 | options->forward_agent = 0; | |
1171 | if (options->forward_x11 == -1) | |
1172 | options->forward_x11 = 0; | |
1173 | if (options->forward_x11_trusted == -1) | |
1174 | options->forward_x11_trusted = 0; | |
1175 | if (options->exit_on_forward_failure == -1) | |
1176 | options->exit_on_forward_failure = 0; | |
1177 | if (options->xauth_location == NULL) | |
1178 | options->xauth_location = _PATH_XAUTH; | |
1179 | if (options->gateway_ports == -1) | |
1180 | options->gateway_ports = 0; | |
1181 | if (options->use_privileged_port == -1) | |
1182 | options->use_privileged_port = 0; | |
1183 | if (options->rsa_authentication == -1) | |
1184 | options->rsa_authentication = 1; | |
1185 | if (options->pubkey_authentication == -1) | |
1186 | options->pubkey_authentication = 1; | |
1187 | if (options->challenge_response_authentication == -1) | |
1188 | options->challenge_response_authentication = 1; | |
1189 | if (options->gss_authentication == -1) | |
1190 | options->gss_authentication = 1; | |
1191 | if (options->gss_keyex == -1) | |
1192 | options->gss_keyex = 1; | |
1193 | if (options->gss_deleg_creds == -1) | |
1194 | options->gss_deleg_creds = 1; | |
1195 | if (options->gss_trust_dns == -1) | |
1196 | options->gss_trust_dns = 1; | |
1197 | if (options->gss_renewal_rekey == -1) | |
1198 | options->gss_renewal_rekey = 0; | |
1199 | if (options->password_authentication == -1) | |
1200 | options->password_authentication = 1; | |
1201 | if (options->kbd_interactive_authentication == -1) | |
1202 | options->kbd_interactive_authentication = 1; | |
1203 | if (options->rhosts_rsa_authentication == -1) | |
1204 | options->rhosts_rsa_authentication = 0; | |
1205 | if (options->hostbased_authentication == -1) | |
1206 | options->hostbased_authentication = 0; | |
1207 | if (options->batch_mode == -1) | |
1208 | options->batch_mode = 0; | |
1209 | if (options->check_host_ip == -1) | |
1210 | options->check_host_ip = 1; | |
1211 | if (options->strict_host_key_checking == -1) | |
1212 | options->strict_host_key_checking = 2; /* 2 is default */ | |
1213 | if (options->compression == -1) | |
1214 | options->compression = 0; | |
1215 | if (options->tcp_keep_alive == -1) | |
1216 | options->tcp_keep_alive = 1; | |
1217 | if (options->compression_level == -1) | |
1218 | options->compression_level = 6; | |
1219 | if (options->port == -1) | |
1220 | options->port = 0; /* Filled in ssh_connect. */ | |
1221 | if (options->address_family == -1) | |
1222 | options->address_family = AF_UNSPEC; | |
1223 | if (options->connection_attempts == -1) | |
1224 | options->connection_attempts = 1; | |
1225 | if (options->number_of_password_prompts == -1) | |
1226 | options->number_of_password_prompts = 3; | |
1227 | /* Selected in ssh_login(). */ | |
1228 | if (options->cipher == -1) | |
1229 | options->cipher = SSH_CIPHER_NOT_SET; | |
1230 | /* options->ciphers, default set in myproposals.h */ | |
1231 | /* options->macs, default set in myproposals.h */ | |
1232 | /* options->hostkeyalgorithms, default set in myproposals.h */ | |
1233 | if (options->protocol == SSH_PROTO_UNKNOWN) | |
1234 | options->protocol = SSH_PROTO_1|SSH_PROTO_2; | |
1235 | if (options->num_identity_files == 0) { | |
1236 | if (options->protocol & SSH_PROTO_1) { | |
1237 | len = 2 + strlen(_PATH_SSH_CLIENT_IDENTITY) + 1; | |
1238 | options->identity_files[options->num_identity_files] = | |
1239 | xmalloc(len); | |
1240 | snprintf(options->identity_files[options->num_identity_files++], | |
1241 | len, "~/%.100s", _PATH_SSH_CLIENT_IDENTITY); | |
1242 | } | |
1243 | if (options->protocol & SSH_PROTO_2) { | |
1244 | len = 2 + strlen(_PATH_SSH_CLIENT_ID_RSA) + 1; | |
1245 | options->identity_files[options->num_identity_files] = | |
1246 | xmalloc(len); | |
1247 | snprintf(options->identity_files[options->num_identity_files++], | |
1248 | len, "~/%.100s", _PATH_SSH_CLIENT_ID_RSA); | |
1249 | ||
1250 | len = 2 + strlen(_PATH_SSH_CLIENT_ID_DSA) + 1; | |
1251 | options->identity_files[options->num_identity_files] = | |
1252 | xmalloc(len); | |
1253 | snprintf(options->identity_files[options->num_identity_files++], | |
1254 | len, "~/%.100s", _PATH_SSH_CLIENT_ID_DSA); | |
1255 | } | |
1256 | } | |
1257 | if (options->escape_char == -1) | |
1258 | options->escape_char = '~'; | |
1259 | if (options->system_hostfile == NULL) | |
1260 | options->system_hostfile = _PATH_SSH_SYSTEM_HOSTFILE; | |
1261 | if (options->user_hostfile == NULL) | |
1262 | options->user_hostfile = _PATH_SSH_USER_HOSTFILE; | |
1263 | if (options->system_hostfile2 == NULL) | |
1264 | options->system_hostfile2 = _PATH_SSH_SYSTEM_HOSTFILE2; | |
1265 | if (options->user_hostfile2 == NULL) | |
1266 | options->user_hostfile2 = _PATH_SSH_USER_HOSTFILE2; | |
1267 | if (options->log_level == SYSLOG_LEVEL_NOT_SET) | |
1268 | options->log_level = SYSLOG_LEVEL_INFO; | |
1269 | if (options->clear_forwardings == 1) | |
1270 | clear_forwardings(options); | |
1271 | if (options->no_host_authentication_for_localhost == - 1) | |
1272 | options->no_host_authentication_for_localhost = 0; | |
1273 | if (options->identities_only == -1) | |
1274 | options->identities_only = 0; | |
1275 | if (options->enable_ssh_keysign == -1) | |
1276 | options->enable_ssh_keysign = 0; | |
1277 | if (options->rekey_limit == -1) | |
1278 | options->rekey_limit = 0; | |
1279 | if (options->verify_host_key_dns == -1) | |
1280 | options->verify_host_key_dns = 0; | |
1281 | if (options->server_alive_interval == -1) | |
1282 | options->server_alive_interval = 0; | |
1283 | if (options->server_alive_count_max == -1) | |
1284 | options->server_alive_count_max = 3; | |
1285 | if (options->none_switch == -1) | |
1286 | options->none_switch = 0; | |
1287 | if (options->hpn_disabled == -1) | |
1288 | options->hpn_disabled = 0; | |
1289 | if (options->hpn_buffer_size > -1) | |
1290 | { | |
1291 | /* if a user tries to set the size to 0 set it to 1KB */ | |
1292 | if (options->hpn_buffer_size == 0) | |
1293 | options->hpn_buffer_size = 1024; | |
1294 | /*limit the buffer to 64MB*/ | |
1295 | if (options->hpn_buffer_size > 65536) | |
1296 | { | |
1297 | options->hpn_buffer_size = 65536*1024; | |
1298 | debug("User requested buffer larger than 64MB. Request reverted to 64MB"); | |
1299 | } | |
1300 | debug("hpn_buffer_size set to %d", options->hpn_buffer_size); | |
1301 | } | |
1302 | if (options->tcp_rcv_buf == 0) | |
1303 | options->tcp_rcv_buf = 1; | |
1304 | if (options->tcp_rcv_buf > -1) | |
1305 | options->tcp_rcv_buf *=1024; | |
1306 | if (options->tcp_rcv_buf_poll == -1) | |
1307 | options->tcp_rcv_buf_poll = 1; | |
1308 | if (options->control_master == -1) | |
1309 | options->control_master = 0; | |
1310 | if (options->hash_known_hosts == -1) | |
1311 | options->hash_known_hosts = 0; | |
1312 | if (options->tun_open == -1) | |
1313 | options->tun_open = SSH_TUNMODE_NO; | |
1314 | if (options->tun_local == -1) | |
1315 | options->tun_local = SSH_TUNID_ANY; | |
1316 | if (options->tun_remote == -1) | |
1317 | options->tun_remote = SSH_TUNID_ANY; | |
1318 | if (options->permit_local_command == -1) | |
1319 | options->permit_local_command = 0; | |
1320 | if (options->visual_host_key == -1) | |
1321 | options->visual_host_key = 0; | |
1322 | if (options->zero_knowledge_password_authentication == -1) | |
1323 | options->zero_knowledge_password_authentication = 0; | |
1324 | /* options->local_command should not be set by default */ | |
1325 | /* options->proxy_command should not be set by default */ | |
1326 | /* options->user will be set in the main program if appropriate */ | |
1327 | /* options->hostname will be set in the main program if appropriate */ | |
1328 | /* options->host_key_alias should not be set by default */ | |
1329 | /* options->preferred_authentications will be set in ssh */ | |
1330 | } | |
1331 | ||
1332 | /* | |
1333 | * parse_forward | |
1334 | * parses a string containing a port forwarding specification of the form: | |
1335 | * dynamicfwd == 0 | |
1336 | * [listenhost:]listenport:connecthost:connectport | |
1337 | * dynamicfwd == 1 | |
1338 | * [listenhost:]listenport | |
1339 | * returns number of arguments parsed or zero on error | |
1340 | */ | |
1341 | int | |
1342 | parse_forward(Forward *fwd, const char *fwdspec, int dynamicfwd, int remotefwd) | |
1343 | { | |
1344 | int i; | |
1345 | char *p, *cp, *fwdarg[4]; | |
1346 | ||
1347 | memset(fwd, '\0', sizeof(*fwd)); | |
1348 | ||
1349 | cp = p = xstrdup(fwdspec); | |
1350 | ||
1351 | /* skip leading spaces */ | |
1352 | while (isspace(*cp)) | |
1353 | cp++; | |
1354 | ||
1355 | for (i = 0; i < 4; ++i) | |
1356 | if ((fwdarg[i] = hpdelim(&cp)) == NULL) | |
1357 | break; | |
1358 | ||
1359 | /* Check for trailing garbage */ | |
1360 | if (cp != NULL) | |
1361 | i = 0; /* failure */ | |
1362 | ||
1363 | switch (i) { | |
1364 | case 1: | |
1365 | fwd->listen_host = NULL; | |
1366 | fwd->listen_port = a2port(fwdarg[0]); | |
1367 | fwd->connect_host = xstrdup("socks"); | |
1368 | break; | |
1369 | ||
1370 | case 2: | |
1371 | fwd->listen_host = xstrdup(cleanhostname(fwdarg[0])); | |
1372 | fwd->listen_port = a2port(fwdarg[1]); | |
1373 | fwd->connect_host = xstrdup("socks"); | |
1374 | break; | |
1375 | ||
1376 | case 3: | |
1377 | fwd->listen_host = NULL; | |
1378 | fwd->listen_port = a2port(fwdarg[0]); | |
1379 | fwd->connect_host = xstrdup(cleanhostname(fwdarg[1])); | |
1380 | fwd->connect_port = a2port(fwdarg[2]); | |
1381 | break; | |
1382 | ||
1383 | case 4: | |
1384 | fwd->listen_host = xstrdup(cleanhostname(fwdarg[0])); | |
1385 | fwd->listen_port = a2port(fwdarg[1]); | |
1386 | fwd->connect_host = xstrdup(cleanhostname(fwdarg[2])); | |
1387 | fwd->connect_port = a2port(fwdarg[3]); | |
1388 | break; | |
1389 | default: | |
1390 | i = 0; /* failure */ | |
1391 | } | |
1392 | ||
1393 | xfree(p); | |
1394 | ||
1395 | if (dynamicfwd) { | |
1396 | if (!(i == 1 || i == 2)) | |
1397 | goto fail_free; | |
1398 | } else { | |
1399 | if (!(i == 3 || i == 4)) | |
1400 | goto fail_free; | |
1401 | if (fwd->connect_port <= 0) | |
1402 | goto fail_free; | |
1403 | } | |
1404 | ||
1405 | if (fwd->listen_port < 0 || (!remotefwd && fwd->listen_port == 0)) | |
1406 | goto fail_free; | |
1407 | ||
1408 | if (fwd->connect_host != NULL && | |
1409 | strlen(fwd->connect_host) >= NI_MAXHOST) | |
1410 | goto fail_free; | |
1411 | if (fwd->listen_host != NULL && | |
1412 | strlen(fwd->listen_host) >= NI_MAXHOST) | |
1413 | goto fail_free; | |
1414 | ||
1415 | ||
1416 | return (i); | |
1417 | ||
1418 | fail_free: | |
1419 | if (fwd->connect_host != NULL) { | |
1420 | xfree(fwd->connect_host); | |
1421 | fwd->connect_host = NULL; | |
1422 | } | |
1423 | if (fwd->listen_host != NULL) { | |
1424 | xfree(fwd->listen_host); | |
1425 | fwd->listen_host = NULL; | |
1426 | } | |
1427 | return (0); | |
1428 | } |