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5156b1a1 | 1 | /* $OpenBSD: readconf.c,v 1.167 2008/06/26 11:46:31 grunk Exp $ */ |
3c0ef626 | 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" | |
3c0ef626 | 16 | |
30460aeb | 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 | ||
3c0ef626 | 32 | #include "xmalloc.h" |
30460aeb | 33 | #include "ssh.h" |
3c0ef626 | 34 | #include "compat.h" |
35 | #include "cipher.h" | |
36 | #include "pathnames.h" | |
37 | #include "log.h" | |
30460aeb | 38 | #include "key.h" |
3c0ef626 | 39 | #include "readconf.h" |
40 | #include "match.h" | |
41 | #include "misc.h" | |
30460aeb | 42 | #include "buffer.h" |
3c0ef626 | 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 | |
44a053a3 | 61 | User foo |
3c0ef626 | 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 | |
3c0ef626 | 77 | PasswordAuthentication no |
78 | ||
79 | Host puukko.hut.fi | |
80 | User t35124p | |
81 | ProxyCommand ssh-proxy %h %p | |
82 | ||
83 | Host *.fr | |
44a053a3 | 84 | PublicKeyAuthentication no |
3c0ef626 | 85 | |
86 | Host *.su | |
87 | Cipher none | |
88 | PasswordAuthentication no | |
89 | ||
08822d99 | 90 | Host vpn.fake.com |
91 | Tunnel yes | |
92 | TunnelDevice 3 | |
93 | ||
3c0ef626 | 94 | # Defaults for various options |
95 | Host * | |
96 | ForwardAgent no | |
97 | ForwardX11 no | |
3c0ef626 | 98 | PasswordAuthentication yes |
99 | RSAAuthentication yes | |
100 | RhostsRSAAuthentication yes | |
3c0ef626 | 101 | StrictHostKeyChecking yes |
540d72c3 | 102 | TcpKeepAlive no |
3c0ef626 | 103 | IdentityFile ~/.ssh/identity |
104 | Port 22 | |
105 | EscapeChar ~ | |
106 | ||
107 | */ | |
108 | ||
109 | /* Keyword tokens. */ | |
110 | ||
111 | typedef enum { | |
112 | oBadOption, | |
540d72c3 | 113 | oForwardAgent, oForwardX11, oForwardX11Trusted, oGatewayPorts, |
30460aeb | 114 | oExitOnForwardFailure, |
44a053a3 | 115 | oPasswordAuthentication, oRSAAuthentication, |
3c0ef626 | 116 | oChallengeResponseAuthentication, oXAuthLocation, |
3c0ef626 | 117 | oIdentityFile, oHostName, oPort, oCipher, oRemoteForward, oLocalForward, |
118 | oUser, oHost, oEscapeChar, oRhostsRSAAuthentication, oProxyCommand, | |
119 | oGlobalKnownHostsFile, oUserKnownHostsFile, oConnectionAttempts, | |
120 | oBatchMode, oCheckHostIP, oStrictHostKeyChecking, oCompression, | |
540d72c3 | 121 | oCompressionLevel, oTCPKeepAlive, oNumberOfPasswordPrompts, |
3c0ef626 | 122 | oUsePrivilegedPort, oLogLevel, oCiphers, oProtocol, oMacs, |
123 | oGlobalKnownHostsFile2, oUserKnownHostsFile2, oPubkeyAuthentication, | |
124 | oKbdInteractiveAuthentication, oKbdInteractiveDevices, oHostKeyAlias, | |
125 | oDynamicForward, oPreferredAuthentications, oHostbasedAuthentication, | |
126 | oHostKeyAlgorithms, oBindAddress, oSmartcardDevice, | |
44a053a3 | 127 | oClearAllForwardings, oNoHostAuthenticationForLocalhost, |
7cac2b65 | 128 | oEnableSSHKeysign, oRekeyLimit, oVerifyHostKeyDNS, oConnectTimeout, |
f472818d | 129 | oAddressFamily, oGssAuthentication, oGssDelegateCreds, |
130 | oGssKeyEx, | |
fe4ad273 | 131 | oGssTrustDns, |
12a403af | 132 | oServerAliveInterval, oServerAliveCountMax, oIdentitiesOnly, |
dfddba3d | 133 | oSendEnv, oControlPath, oControlMaster, oHashKnownHosts, |
08822d99 | 134 | oTunnel, oTunnelDevice, oLocalCommand, oPermitLocalCommand, |
a7213e65 | 135 | oNoneEnabled, oTcpRcvBufPoll, oTcpRcvBuf, oNoneSwitch, oHPNDisabled, |
136 | oHPNBufferSize, | |
5156b1a1 | 137 | oVisualHostKey, |
7cac2b65 | 138 | oDeprecated, oUnsupported |
3c0ef626 | 139 | } OpCodes; |
140 | ||
141 | /* Textual representations of the tokens. */ | |
142 | ||
143 | static struct { | |
144 | const char *name; | |
145 | OpCodes opcode; | |
146 | } keywords[] = { | |
147 | { "forwardagent", oForwardAgent }, | |
148 | { "forwardx11", oForwardX11 }, | |
540d72c3 | 149 | { "forwardx11trusted", oForwardX11Trusted }, |
30460aeb | 150 | { "exitonforwardfailure", oExitOnForwardFailure }, |
3c0ef626 | 151 | { "xauthlocation", oXAuthLocation }, |
152 | { "gatewayports", oGatewayPorts }, | |
153 | { "useprivilegedport", oUsePrivilegedPort }, | |
7cac2b65 | 154 | { "rhostsauthentication", oDeprecated }, |
3c0ef626 | 155 | { "passwordauthentication", oPasswordAuthentication }, |
156 | { "kbdinteractiveauthentication", oKbdInteractiveAuthentication }, | |
157 | { "kbdinteractivedevices", oKbdInteractiveDevices }, | |
158 | { "rsaauthentication", oRSAAuthentication }, | |
159 | { "pubkeyauthentication", oPubkeyAuthentication }, | |
160 | { "dsaauthentication", oPubkeyAuthentication }, /* alias */ | |
161 | { "rhostsrsaauthentication", oRhostsRSAAuthentication }, | |
162 | { "hostbasedauthentication", oHostbasedAuthentication }, | |
163 | { "challengeresponseauthentication", oChallengeResponseAuthentication }, | |
164 | { "skeyauthentication", oChallengeResponseAuthentication }, /* alias */ | |
165 | { "tisauthentication", oChallengeResponseAuthentication }, /* alias */ | |
7cac2b65 | 166 | { "kerberosauthentication", oUnsupported }, |
167 | { "kerberostgtpassing", oUnsupported }, | |
168 | { "afstokenpassing", oUnsupported }, | |
169 | #if defined(GSSAPI) | |
5598e598 | 170 | { "gssapiauthentication", oGssAuthentication }, |
7a056ed1 | 171 | { "gssapikeyexchange", oGssKeyEx }, |
5598e598 | 172 | { "gssapidelegatecredentials", oGssDelegateCreds }, |
fe4ad273 | 173 | { "gssapitrustdns", oGssTrustDns }, |
7cac2b65 | 174 | #else |
175 | { "gssapiauthentication", oUnsupported }, | |
176 | { "gssapikeyexchange", oUnsupported }, | |
177 | { "gssapidelegatecredentials", oUnsupported }, | |
fe4ad273 | 178 | { "gssapitrustdns", oUnsupported }, |
3c0ef626 | 179 | #endif |
44a053a3 | 180 | { "fallbacktorsh", oDeprecated }, |
181 | { "usersh", oDeprecated }, | |
3c0ef626 | 182 | { "identityfile", oIdentityFile }, |
183 | { "identityfile2", oIdentityFile }, /* alias */ | |
12a403af | 184 | { "identitiesonly", oIdentitiesOnly }, |
3c0ef626 | 185 | { "hostname", oHostName }, |
186 | { "hostkeyalias", oHostKeyAlias }, | |
187 | { "proxycommand", oProxyCommand }, | |
188 | { "port", oPort }, | |
189 | { "cipher", oCipher }, | |
190 | { "ciphers", oCiphers }, | |
191 | { "macs", oMacs }, | |
192 | { "protocol", oProtocol }, | |
193 | { "remoteforward", oRemoteForward }, | |
194 | { "localforward", oLocalForward }, | |
195 | { "user", oUser }, | |
196 | { "host", oHost }, | |
197 | { "escapechar", oEscapeChar }, | |
198 | { "globalknownhostsfile", oGlobalKnownHostsFile }, | |
199 | { "userknownhostsfile", oUserKnownHostsFile }, /* obsolete */ | |
200 | { "globalknownhostsfile2", oGlobalKnownHostsFile2 }, | |
201 | { "userknownhostsfile2", oUserKnownHostsFile2 }, /* obsolete */ | |
202 | { "connectionattempts", oConnectionAttempts }, | |
203 | { "batchmode", oBatchMode }, | |
204 | { "checkhostip", oCheckHostIP }, | |
205 | { "stricthostkeychecking", oStrictHostKeyChecking }, | |
206 | { "compression", oCompression }, | |
207 | { "compressionlevel", oCompressionLevel }, | |
540d72c3 | 208 | { "tcpkeepalive", oTCPKeepAlive }, |
209 | { "keepalive", oTCPKeepAlive }, /* obsolete */ | |
3c0ef626 | 210 | { "numberofpasswordprompts", oNumberOfPasswordPrompts }, |
211 | { "loglevel", oLogLevel }, | |
212 | { "dynamicforward", oDynamicForward }, | |
213 | { "preferredauthentications", oPreferredAuthentications }, | |
214 | { "hostkeyalgorithms", oHostKeyAlgorithms }, | |
215 | { "bindaddress", oBindAddress }, | |
7cac2b65 | 216 | #ifdef SMARTCARD |
3c0ef626 | 217 | { "smartcarddevice", oSmartcardDevice }, |
7cac2b65 | 218 | #else |
219 | { "smartcarddevice", oUnsupported }, | |
220 | #endif | |
e9702f7d | 221 | { "clearallforwardings", oClearAllForwardings }, |
bfe49944 | 222 | { "enablesshkeysign", oEnableSSHKeysign }, |
7cac2b65 | 223 | { "verifyhostkeydns", oVerifyHostKeyDNS }, |
e9702f7d | 224 | { "nohostauthenticationforlocalhost", oNoHostAuthenticationForLocalhost }, |
7cac2b65 | 225 | { "rekeylimit", oRekeyLimit }, |
226 | { "connecttimeout", oConnectTimeout }, | |
227 | { "addressfamily", oAddressFamily }, | |
540d72c3 | 228 | { "serveraliveinterval", oServerAliveInterval }, |
229 | { "serveralivecountmax", oServerAliveCountMax }, | |
7e82606e | 230 | { "sendenv", oSendEnv }, |
231 | { "controlpath", oControlPath }, | |
232 | { "controlmaster", oControlMaster }, | |
dfddba3d | 233 | { "hashknownhosts", oHashKnownHosts }, |
08822d99 | 234 | { "tunnel", oTunnel }, |
235 | { "tunneldevice", oTunnelDevice }, | |
236 | { "localcommand", oLocalCommand }, | |
237 | { "permitlocalcommand", oPermitLocalCommand }, | |
a7213e65 | 238 | { "noneenabled", oNoneEnabled }, |
239 | { "tcprcvbufpoll", oTcpRcvBufPoll }, | |
240 | { "tcprcvbuf", oTcpRcvBuf }, | |
241 | { "noneswitch", oNoneSwitch }, | |
242 | { "hpndisabled", oHPNDisabled }, | |
243 | { "hpnbuffersize", oHPNBufferSize }, | |
5156b1a1 | 244 | { "visualhostkey", oVisualHostKey }, |
e9702f7d | 245 | { NULL, oBadOption } |
3c0ef626 | 246 | }; |
247 | ||
248 | /* | |
249 | * Adds a local TCP/IP port forward to options. Never returns if there is an | |
250 | * error. | |
251 | */ | |
252 | ||
253 | void | |
dfddba3d | 254 | add_local_forward(Options *options, const Forward *newfwd) |
3c0ef626 | 255 | { |
256 | Forward *fwd; | |
d03f4262 | 257 | #ifndef NO_IPPORT_RESERVED_CONCEPT |
3c0ef626 | 258 | extern uid_t original_real_uid; |
dfddba3d | 259 | if (newfwd->listen_port < IPPORT_RESERVED && original_real_uid != 0) |
3c0ef626 | 260 | fatal("Privileged ports can only be forwarded by root."); |
261 | #endif | |
262 | if (options->num_local_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
263 | fatal("Too many local forwards (max %d).", SSH_MAX_FORWARDS_PER_DIRECTION); | |
264 | fwd = &options->local_forwards[options->num_local_forwards++]; | |
dfddba3d | 265 | |
266 | fwd->listen_host = (newfwd->listen_host == NULL) ? | |
267 | NULL : xstrdup(newfwd->listen_host); | |
268 | fwd->listen_port = newfwd->listen_port; | |
269 | fwd->connect_host = xstrdup(newfwd->connect_host); | |
270 | fwd->connect_port = newfwd->connect_port; | |
3c0ef626 | 271 | } |
272 | ||
273 | /* | |
274 | * Adds a remote TCP/IP port forward to options. Never returns if there is | |
275 | * an error. | |
276 | */ | |
277 | ||
278 | void | |
dfddba3d | 279 | add_remote_forward(Options *options, const Forward *newfwd) |
3c0ef626 | 280 | { |
281 | Forward *fwd; | |
282 | if (options->num_remote_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
283 | fatal("Too many remote forwards (max %d).", | |
e9702f7d | 284 | SSH_MAX_FORWARDS_PER_DIRECTION); |
3c0ef626 | 285 | fwd = &options->remote_forwards[options->num_remote_forwards++]; |
dfddba3d | 286 | |
287 | fwd->listen_host = (newfwd->listen_host == NULL) ? | |
288 | NULL : xstrdup(newfwd->listen_host); | |
289 | fwd->listen_port = newfwd->listen_port; | |
290 | fwd->connect_host = xstrdup(newfwd->connect_host); | |
291 | fwd->connect_port = newfwd->connect_port; | |
3c0ef626 | 292 | } |
293 | ||
294 | static void | |
295 | clear_forwardings(Options *options) | |
296 | { | |
297 | int i; | |
298 | ||
dfddba3d | 299 | for (i = 0; i < options->num_local_forwards; i++) { |
8b32eddc | 300 | if (options->local_forwards[i].listen_host != NULL) |
301 | xfree(options->local_forwards[i].listen_host); | |
dfddba3d | 302 | xfree(options->local_forwards[i].connect_host); |
303 | } | |
3c0ef626 | 304 | options->num_local_forwards = 0; |
dfddba3d | 305 | for (i = 0; i < options->num_remote_forwards; i++) { |
8b32eddc | 306 | if (options->remote_forwards[i].listen_host != NULL) |
307 | xfree(options->remote_forwards[i].listen_host); | |
dfddba3d | 308 | xfree(options->remote_forwards[i].connect_host); |
309 | } | |
3c0ef626 | 310 | options->num_remote_forwards = 0; |
08822d99 | 311 | options->tun_open = SSH_TUNMODE_NO; |
3c0ef626 | 312 | } |
313 | ||
314 | /* | |
315 | * Returns the number of the token pointed to by cp or oBadOption. | |
316 | */ | |
317 | ||
318 | static OpCodes | |
319 | parse_token(const char *cp, const char *filename, int linenum) | |
320 | { | |
321 | u_int i; | |
322 | ||
323 | for (i = 0; keywords[i].name; i++) | |
324 | if (strcasecmp(cp, keywords[i].name) == 0) | |
325 | return keywords[i].opcode; | |
326 | ||
327 | error("%s: line %d: Bad configuration option: %s", | |
328 | filename, linenum, cp); | |
329 | return oBadOption; | |
330 | } | |
331 | ||
332 | /* | |
333 | * Processes a single option line as used in the configuration files. This | |
334 | * only sets those values that have not already been set. | |
335 | */ | |
bfe49944 | 336 | #define WHITESPACE " \t\r\n" |
3c0ef626 | 337 | |
338 | int | |
339 | process_config_line(Options *options, const char *host, | |
340 | char *line, const char *filename, int linenum, | |
341 | int *activep) | |
342 | { | |
dfddba3d | 343 | char *s, **charptr, *endofnumber, *keyword, *arg, *arg2, fwdarg[256]; |
30460aeb | 344 | int opcode, *intptr, value, value2, scale; |
e74dc197 | 345 | LogLevel *log_level_ptr; |
30460aeb | 346 | long long orig, val64; |
bfe49944 | 347 | size_t len; |
dfddba3d | 348 | Forward fwd; |
3c0ef626 | 349 | |
7cac2b65 | 350 | /* Strip trailing whitespace */ |
8b32eddc | 351 | for (len = strlen(line) - 1; len > 0; len--) { |
7cac2b65 | 352 | if (strchr(WHITESPACE, line[len]) == NULL) |
353 | break; | |
354 | line[len] = '\0'; | |
355 | } | |
356 | ||
3c0ef626 | 357 | s = line; |
358 | /* Get the keyword. (Each line is supposed to begin with a keyword). */ | |
30460aeb | 359 | if ((keyword = strdelim(&s)) == NULL) |
360 | return 0; | |
3c0ef626 | 361 | /* Ignore leading whitespace. */ |
362 | if (*keyword == '\0') | |
363 | keyword = strdelim(&s); | |
364 | if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#') | |
365 | return 0; | |
366 | ||
367 | opcode = parse_token(keyword, filename, linenum); | |
368 | ||
369 | switch (opcode) { | |
370 | case oBadOption: | |
371 | /* don't panic, but count bad options */ | |
372 | return -1; | |
373 | /* NOTREACHED */ | |
7cac2b65 | 374 | case oConnectTimeout: |
375 | intptr = &options->connection_timeout; | |
540d72c3 | 376 | parse_time: |
7cac2b65 | 377 | arg = strdelim(&s); |
378 | if (!arg || *arg == '\0') | |
379 | fatal("%s line %d: missing time value.", | |
380 | filename, linenum); | |
381 | if ((value = convtime(arg)) == -1) | |
382 | fatal("%s line %d: invalid time value.", | |
383 | filename, linenum); | |
0b90ac93 | 384 | if (*activep && *intptr == -1) |
7cac2b65 | 385 | *intptr = value; |
386 | break; | |
387 | ||
3c0ef626 | 388 | case oForwardAgent: |
389 | intptr = &options->forward_agent; | |
390 | parse_flag: | |
391 | arg = strdelim(&s); | |
392 | if (!arg || *arg == '\0') | |
393 | fatal("%.200s line %d: Missing yes/no argument.", filename, linenum); | |
394 | value = 0; /* To avoid compiler warning... */ | |
395 | if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0) | |
396 | value = 1; | |
397 | else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0) | |
398 | value = 0; | |
399 | else | |
400 | fatal("%.200s line %d: Bad yes/no argument.", filename, linenum); | |
401 | if (*activep && *intptr == -1) | |
402 | *intptr = value; | |
403 | break; | |
404 | ||
405 | case oForwardX11: | |
406 | intptr = &options->forward_x11; | |
407 | goto parse_flag; | |
408 | ||
540d72c3 | 409 | case oForwardX11Trusted: |
410 | intptr = &options->forward_x11_trusted; | |
411 | goto parse_flag; | |
412 | ||
3c0ef626 | 413 | case oGatewayPorts: |
414 | intptr = &options->gateway_ports; | |
415 | goto parse_flag; | |
416 | ||
30460aeb | 417 | case oExitOnForwardFailure: |
418 | intptr = &options->exit_on_forward_failure; | |
419 | goto parse_flag; | |
420 | ||
3c0ef626 | 421 | case oUsePrivilegedPort: |
422 | intptr = &options->use_privileged_port; | |
423 | goto parse_flag; | |
424 | ||
3c0ef626 | 425 | case oPasswordAuthentication: |
426 | intptr = &options->password_authentication; | |
427 | goto parse_flag; | |
428 | ||
429 | case oKbdInteractiveAuthentication: | |
430 | intptr = &options->kbd_interactive_authentication; | |
431 | goto parse_flag; | |
432 | ||
433 | case oKbdInteractiveDevices: | |
434 | charptr = &options->kbd_interactive_devices; | |
435 | goto parse_string; | |
436 | ||
437 | case oPubkeyAuthentication: | |
438 | intptr = &options->pubkey_authentication; | |
439 | goto parse_flag; | |
440 | ||
441 | case oRSAAuthentication: | |
442 | intptr = &options->rsa_authentication; | |
443 | goto parse_flag; | |
444 | ||
445 | case oRhostsRSAAuthentication: | |
446 | intptr = &options->rhosts_rsa_authentication; | |
447 | goto parse_flag; | |
448 | ||
449 | case oHostbasedAuthentication: | |
450 | intptr = &options->hostbased_authentication; | |
451 | goto parse_flag; | |
452 | ||
453 | case oChallengeResponseAuthentication: | |
454 | intptr = &options->challenge_response_authentication; | |
455 | goto parse_flag; | |
7cac2b65 | 456 | |
5598e598 | 457 | case oGssAuthentication: |
458 | intptr = &options->gss_authentication; | |
459 | goto parse_flag; | |
7cac2b65 | 460 | |
7a056ed1 | 461 | case oGssKeyEx: |
462 | intptr = &options->gss_keyex; | |
463 | goto parse_flag; | |
464 | ||
5598e598 | 465 | case oGssDelegateCreds: |
466 | intptr = &options->gss_deleg_creds; | |
467 | goto parse_flag; | |
5598e598 | 468 | |
fe4ad273 | 469 | case oGssTrustDns: |
470 | intptr = &options->gss_trust_dns; | |
471 | goto parse_flag; | |
472 | ||
3c0ef626 | 473 | case oBatchMode: |
474 | intptr = &options->batch_mode; | |
475 | goto parse_flag; | |
476 | ||
477 | case oCheckHostIP: | |
478 | intptr = &options->check_host_ip; | |
479 | goto parse_flag; | |
480 | ||
a7213e65 | 481 | case oNoneEnabled: |
482 | intptr = &options->none_enabled; | |
483 | goto parse_flag; | |
231cecf9 | 484 | |
485 | /* we check to see if the command comes from the */ | |
486 | /* command line or not. If it does then enable it */ | |
487 | /* otherwise fail. NONE should never be a default configuration */ | |
a7213e65 | 488 | case oNoneSwitch: |
231cecf9 | 489 | if(strcmp(filename,"command-line")==0) |
490 | { | |
491 | intptr = &options->none_switch; | |
492 | goto parse_flag; | |
493 | } else { | |
494 | error("NoneSwitch is found in %.200s.\nYou may only use this configuration option from the command line", filename); | |
495 | error("Continuing..."); | |
496 | debug("NoneSwitch directive found in %.200s.", filename); | |
497 | return 0; | |
498 | } | |
a7213e65 | 499 | |
500 | case oHPNDisabled: | |
501 | intptr = &options->hpn_disabled; | |
502 | goto parse_flag; | |
503 | ||
504 | case oHPNBufferSize: | |
505 | intptr = &options->hpn_buffer_size; | |
506 | goto parse_int; | |
507 | ||
508 | case oTcpRcvBufPoll: | |
509 | intptr = &options->tcp_rcv_buf_poll; | |
510 | goto parse_flag; | |
511 | ||
7cac2b65 | 512 | case oVerifyHostKeyDNS: |
513 | intptr = &options->verify_host_key_dns; | |
540d72c3 | 514 | goto parse_yesnoask; |
7cac2b65 | 515 | |
3c0ef626 | 516 | case oStrictHostKeyChecking: |
517 | intptr = &options->strict_host_key_checking; | |
540d72c3 | 518 | parse_yesnoask: |
3c0ef626 | 519 | arg = strdelim(&s); |
520 | if (!arg || *arg == '\0') | |
521 | fatal("%.200s line %d: Missing yes/no/ask argument.", | |
e9702f7d | 522 | filename, linenum); |
3c0ef626 | 523 | value = 0; /* To avoid compiler warning... */ |
524 | if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0) | |
525 | value = 1; | |
526 | else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0) | |
527 | value = 0; | |
528 | else if (strcmp(arg, "ask") == 0) | |
529 | value = 2; | |
530 | else | |
531 | fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum); | |
532 | if (*activep && *intptr == -1) | |
533 | *intptr = value; | |
534 | break; | |
535 | ||
536 | case oCompression: | |
537 | intptr = &options->compression; | |
538 | goto parse_flag; | |
539 | ||
540d72c3 | 540 | case oTCPKeepAlive: |
541 | intptr = &options->tcp_keep_alive; | |
3c0ef626 | 542 | goto parse_flag; |
543 | ||
544 | case oNoHostAuthenticationForLocalhost: | |
545 | intptr = &options->no_host_authentication_for_localhost; | |
546 | goto parse_flag; | |
547 | ||
548 | case oNumberOfPasswordPrompts: | |
549 | intptr = &options->number_of_password_prompts; | |
550 | goto parse_int; | |
551 | ||
552 | case oCompressionLevel: | |
553 | intptr = &options->compression_level; | |
554 | goto parse_int; | |
555 | ||
7cac2b65 | 556 | case oRekeyLimit: |
7cac2b65 | 557 | arg = strdelim(&s); |
558 | if (!arg || *arg == '\0') | |
559 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
560 | if (arg[0] < '0' || arg[0] > '9') | |
561 | fatal("%.200s line %d: Bad number.", filename, linenum); | |
30460aeb | 562 | orig = val64 = strtoll(arg, &endofnumber, 10); |
7cac2b65 | 563 | if (arg == endofnumber) |
564 | fatal("%.200s line %d: Bad number.", filename, linenum); | |
565 | switch (toupper(*endofnumber)) { | |
30460aeb | 566 | case '\0': |
567 | scale = 1; | |
568 | break; | |
7cac2b65 | 569 | case 'K': |
30460aeb | 570 | scale = 1<<10; |
7cac2b65 | 571 | break; |
572 | case 'M': | |
30460aeb | 573 | scale = 1<<20; |
7cac2b65 | 574 | break; |
575 | case 'G': | |
30460aeb | 576 | scale = 1<<30; |
7cac2b65 | 577 | break; |
30460aeb | 578 | default: |
579 | fatal("%.200s line %d: Invalid RekeyLimit suffix", | |
580 | filename, linenum); | |
7cac2b65 | 581 | } |
30460aeb | 582 | val64 *= scale; |
583 | /* detect integer wrap and too-large limits */ | |
e74dc197 | 584 | if ((val64 / scale) != orig || val64 > UINT_MAX) |
30460aeb | 585 | fatal("%.200s line %d: RekeyLimit too large", |
586 | filename, linenum); | |
587 | if (val64 < 16) | |
588 | fatal("%.200s line %d: RekeyLimit too small", | |
589 | filename, linenum); | |
e74dc197 | 590 | if (*activep && options->rekey_limit == -1) |
591 | options->rekey_limit = (u_int32_t)val64; | |
7cac2b65 | 592 | break; |
593 | ||
3c0ef626 | 594 | case oIdentityFile: |
595 | arg = strdelim(&s); | |
596 | if (!arg || *arg == '\0') | |
597 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
598 | if (*activep) { | |
599 | intptr = &options->num_identity_files; | |
600 | if (*intptr >= SSH_MAX_IDENTITY_FILES) | |
601 | fatal("%.200s line %d: Too many identity files specified (max %d).", | |
e9702f7d | 602 | filename, linenum, SSH_MAX_IDENTITY_FILES); |
0b90ac93 | 603 | charptr = &options->identity_files[*intptr]; |
3c0ef626 | 604 | *charptr = xstrdup(arg); |
605 | *intptr = *intptr + 1; | |
606 | } | |
607 | break; | |
608 | ||
609 | case oXAuthLocation: | |
610 | charptr=&options->xauth_location; | |
611 | goto parse_string; | |
612 | ||
613 | case oUser: | |
614 | charptr = &options->user; | |
615 | parse_string: | |
616 | arg = strdelim(&s); | |
617 | if (!arg || *arg == '\0') | |
618 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
619 | if (*activep && *charptr == NULL) | |
620 | *charptr = xstrdup(arg); | |
621 | break; | |
622 | ||
623 | case oGlobalKnownHostsFile: | |
624 | charptr = &options->system_hostfile; | |
625 | goto parse_string; | |
626 | ||
627 | case oUserKnownHostsFile: | |
628 | charptr = &options->user_hostfile; | |
629 | goto parse_string; | |
630 | ||
631 | case oGlobalKnownHostsFile2: | |
632 | charptr = &options->system_hostfile2; | |
633 | goto parse_string; | |
634 | ||
635 | case oUserKnownHostsFile2: | |
636 | charptr = &options->user_hostfile2; | |
637 | goto parse_string; | |
638 | ||
639 | case oHostName: | |
640 | charptr = &options->hostname; | |
641 | goto parse_string; | |
642 | ||
643 | case oHostKeyAlias: | |
644 | charptr = &options->host_key_alias; | |
645 | goto parse_string; | |
646 | ||
647 | case oPreferredAuthentications: | |
648 | charptr = &options->preferred_authentications; | |
649 | goto parse_string; | |
650 | ||
651 | case oBindAddress: | |
652 | charptr = &options->bind_address; | |
653 | goto parse_string; | |
654 | ||
655 | case oSmartcardDevice: | |
656 | charptr = &options->smartcard_device; | |
657 | goto parse_string; | |
658 | ||
659 | case oProxyCommand: | |
08822d99 | 660 | charptr = &options->proxy_command; |
661 | parse_command: | |
7cac2b65 | 662 | if (s == NULL) |
663 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
bfe49944 | 664 | len = strspn(s, WHITESPACE "="); |
3c0ef626 | 665 | if (*activep && *charptr == NULL) |
bfe49944 | 666 | *charptr = xstrdup(s + len); |
3c0ef626 | 667 | return 0; |
668 | ||
669 | case oPort: | |
670 | intptr = &options->port; | |
671 | parse_int: | |
672 | arg = strdelim(&s); | |
673 | if (!arg || *arg == '\0') | |
674 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
675 | if (arg[0] < '0' || arg[0] > '9') | |
676 | fatal("%.200s line %d: Bad number.", filename, linenum); | |
677 | ||
678 | /* Octal, decimal, or hex format? */ | |
679 | value = strtol(arg, &endofnumber, 0); | |
680 | if (arg == endofnumber) | |
681 | fatal("%.200s line %d: Bad number.", filename, linenum); | |
682 | if (*activep && *intptr == -1) | |
683 | *intptr = value; | |
684 | break; | |
685 | ||
686 | case oConnectionAttempts: | |
687 | intptr = &options->connection_attempts; | |
688 | goto parse_int; | |
689 | ||
a7213e65 | 690 | case oTcpRcvBuf: |
691 | intptr = &options->tcp_rcv_buf; | |
692 | goto parse_int; | |
693 | ||
3c0ef626 | 694 | case oCipher: |
695 | intptr = &options->cipher; | |
696 | arg = strdelim(&s); | |
697 | if (!arg || *arg == '\0') | |
698 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
699 | value = cipher_number(arg); | |
700 | if (value == -1) | |
701 | fatal("%.200s line %d: Bad cipher '%s'.", | |
e9702f7d | 702 | filename, linenum, arg ? arg : "<NONE>"); |
3c0ef626 | 703 | if (*activep && *intptr == -1) |
704 | *intptr = value; | |
705 | break; | |
706 | ||
707 | case oCiphers: | |
708 | arg = strdelim(&s); | |
709 | if (!arg || *arg == '\0') | |
710 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
711 | if (!ciphers_valid(arg)) | |
712 | fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.", | |
e9702f7d | 713 | filename, linenum, arg ? arg : "<NONE>"); |
3c0ef626 | 714 | if (*activep && options->ciphers == NULL) |
715 | options->ciphers = xstrdup(arg); | |
716 | break; | |
717 | ||
718 | case oMacs: | |
719 | arg = strdelim(&s); | |
720 | if (!arg || *arg == '\0') | |
721 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
722 | if (!mac_valid(arg)) | |
723 | fatal("%.200s line %d: Bad SSH2 Mac spec '%s'.", | |
e9702f7d | 724 | filename, linenum, arg ? arg : "<NONE>"); |
3c0ef626 | 725 | if (*activep && options->macs == NULL) |
726 | options->macs = xstrdup(arg); | |
727 | break; | |
728 | ||
729 | case oHostKeyAlgorithms: | |
730 | arg = strdelim(&s); | |
731 | if (!arg || *arg == '\0') | |
732 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
733 | if (!key_names_valid2(arg)) | |
734 | fatal("%.200s line %d: Bad protocol 2 host key algorithms '%s'.", | |
e9702f7d | 735 | filename, linenum, arg ? arg : "<NONE>"); |
3c0ef626 | 736 | if (*activep && options->hostkeyalgorithms == NULL) |
737 | options->hostkeyalgorithms = xstrdup(arg); | |
738 | break; | |
739 | ||
740 | case oProtocol: | |
741 | intptr = &options->protocol; | |
742 | arg = strdelim(&s); | |
743 | if (!arg || *arg == '\0') | |
744 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
745 | value = proto_spec(arg); | |
746 | if (value == SSH_PROTO_UNKNOWN) | |
747 | fatal("%.200s line %d: Bad protocol spec '%s'.", | |
e9702f7d | 748 | filename, linenum, arg ? arg : "<NONE>"); |
3c0ef626 | 749 | if (*activep && *intptr == SSH_PROTO_UNKNOWN) |
750 | *intptr = value; | |
751 | break; | |
752 | ||
753 | case oLogLevel: | |
e74dc197 | 754 | log_level_ptr = &options->log_level; |
3c0ef626 | 755 | arg = strdelim(&s); |
756 | value = log_level_number(arg); | |
e9702f7d | 757 | if (value == SYSLOG_LEVEL_NOT_SET) |
3c0ef626 | 758 | fatal("%.200s line %d: unsupported log level '%s'", |
e9702f7d | 759 | filename, linenum, arg ? arg : "<NONE>"); |
e74dc197 | 760 | if (*activep && *log_level_ptr == SYSLOG_LEVEL_NOT_SET) |
761 | *log_level_ptr = (LogLevel) value; | |
3c0ef626 | 762 | break; |
763 | ||
764 | case oLocalForward: | |
765 | case oRemoteForward: | |
766 | arg = strdelim(&s); | |
dfddba3d | 767 | if (arg == NULL || *arg == '\0') |
3c0ef626 | 768 | fatal("%.200s line %d: Missing port argument.", |
769 | filename, linenum); | |
dfddba3d | 770 | arg2 = strdelim(&s); |
771 | if (arg2 == NULL || *arg2 == '\0') | |
772 | fatal("%.200s line %d: Missing target argument.", | |
3c0ef626 | 773 | filename, linenum); |
dfddba3d | 774 | |
775 | /* construct a string for parse_forward */ | |
776 | snprintf(fwdarg, sizeof(fwdarg), "%s:%s", arg, arg2); | |
777 | ||
778 | if (parse_forward(&fwd, fwdarg) == 0) | |
3c0ef626 | 779 | fatal("%.200s line %d: Bad forwarding specification.", |
780 | filename, linenum); | |
dfddba3d | 781 | |
3c0ef626 | 782 | if (*activep) { |
783 | if (opcode == oLocalForward) | |
dfddba3d | 784 | add_local_forward(options, &fwd); |
3c0ef626 | 785 | else if (opcode == oRemoteForward) |
dfddba3d | 786 | add_remote_forward(options, &fwd); |
3c0ef626 | 787 | } |
788 | break; | |
789 | ||
790 | case oDynamicForward: | |
791 | arg = strdelim(&s); | |
792 | if (!arg || *arg == '\0') | |
793 | fatal("%.200s line %d: Missing port argument.", | |
794 | filename, linenum); | |
dfddba3d | 795 | memset(&fwd, '\0', sizeof(fwd)); |
796 | fwd.connect_host = "socks"; | |
797 | fwd.listen_host = hpdelim(&arg); | |
798 | if (fwd.listen_host == NULL || | |
799 | strlen(fwd.listen_host) >= NI_MAXHOST) | |
800 | fatal("%.200s line %d: Bad forwarding specification.", | |
801 | filename, linenum); | |
802 | if (arg) { | |
803 | fwd.listen_port = a2port(arg); | |
804 | fwd.listen_host = cleanhostname(fwd.listen_host); | |
805 | } else { | |
806 | fwd.listen_port = a2port(fwd.listen_host); | |
2ce0bfe4 | 807 | fwd.listen_host = NULL; |
dfddba3d | 808 | } |
809 | if (fwd.listen_port == 0) | |
3c0ef626 | 810 | fatal("%.200s line %d: Badly formatted port number.", |
811 | filename, linenum); | |
812 | if (*activep) | |
dfddba3d | 813 | add_local_forward(options, &fwd); |
3c0ef626 | 814 | break; |
815 | ||
816 | case oClearAllForwardings: | |
817 | intptr = &options->clear_forwardings; | |
818 | goto parse_flag; | |
819 | ||
820 | case oHost: | |
821 | *activep = 0; | |
822 | while ((arg = strdelim(&s)) != NULL && *arg != '\0') | |
823 | if (match_pattern(host, arg)) { | |
824 | debug("Applying options for %.100s", arg); | |
825 | *activep = 1; | |
826 | break; | |
827 | } | |
828 | /* Avoid garbage check below, as strdelim is done. */ | |
829 | return 0; | |
830 | ||
831 | case oEscapeChar: | |
832 | intptr = &options->escape_char; | |
833 | arg = strdelim(&s); | |
834 | if (!arg || *arg == '\0') | |
835 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
836 | if (arg[0] == '^' && arg[2] == 0 && | |
837 | (u_char) arg[1] >= 64 && (u_char) arg[1] < 128) | |
838 | value = (u_char) arg[1] & 31; | |
839 | else if (strlen(arg) == 1) | |
840 | value = (u_char) arg[0]; | |
841 | else if (strcmp(arg, "none") == 0) | |
842 | value = SSH_ESCAPECHAR_NONE; | |
843 | else { | |
844 | fatal("%.200s line %d: Bad escape character.", | |
e9702f7d | 845 | filename, linenum); |
3c0ef626 | 846 | /* NOTREACHED */ |
847 | value = 0; /* Avoid compiler warning. */ | |
848 | } | |
849 | if (*activep && *intptr == -1) | |
850 | *intptr = value; | |
851 | break; | |
852 | ||
7cac2b65 | 853 | case oAddressFamily: |
854 | arg = strdelim(&s); | |
2ce0bfe4 | 855 | if (!arg || *arg == '\0') |
856 | fatal("%s line %d: missing address family.", | |
857 | filename, linenum); | |
7cac2b65 | 858 | intptr = &options->address_family; |
859 | if (strcasecmp(arg, "inet") == 0) | |
860 | value = AF_INET; | |
861 | else if (strcasecmp(arg, "inet6") == 0) | |
862 | value = AF_INET6; | |
863 | else if (strcasecmp(arg, "any") == 0) | |
864 | value = AF_UNSPEC; | |
865 | else | |
866 | fatal("Unsupported AddressFamily \"%s\"", arg); | |
867 | if (*activep && *intptr == -1) | |
868 | *intptr = value; | |
869 | break; | |
870 | ||
bfe49944 | 871 | case oEnableSSHKeysign: |
872 | intptr = &options->enable_ssh_keysign; | |
873 | goto parse_flag; | |
874 | ||
12a403af | 875 | case oIdentitiesOnly: |
876 | intptr = &options->identities_only; | |
877 | goto parse_flag; | |
878 | ||
540d72c3 | 879 | case oServerAliveInterval: |
880 | intptr = &options->server_alive_interval; | |
881 | goto parse_time; | |
882 | ||
883 | case oServerAliveCountMax: | |
884 | intptr = &options->server_alive_count_max; | |
885 | goto parse_int; | |
886 | ||
7e82606e | 887 | case oSendEnv: |
888 | while ((arg = strdelim(&s)) != NULL && *arg != '\0') { | |
889 | if (strchr(arg, '=') != NULL) | |
890 | fatal("%s line %d: Invalid environment name.", | |
891 | filename, linenum); | |
dfddba3d | 892 | if (!*activep) |
893 | continue; | |
7e82606e | 894 | if (options->num_send_env >= MAX_SEND_ENV) |
895 | fatal("%s line %d: too many send env.", | |
896 | filename, linenum); | |
897 | options->send_env[options->num_send_env++] = | |
898 | xstrdup(arg); | |
899 | } | |
900 | break; | |
901 | ||
902 | case oControlPath: | |
903 | charptr = &options->control_path; | |
904 | goto parse_string; | |
905 | ||
906 | case oControlMaster: | |
907 | intptr = &options->control_master; | |
2ce0bfe4 | 908 | arg = strdelim(&s); |
909 | if (!arg || *arg == '\0') | |
910 | fatal("%.200s line %d: Missing ControlMaster argument.", | |
911 | filename, linenum); | |
912 | value = 0; /* To avoid compiler warning... */ | |
913 | if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0) | |
914 | value = SSHCTL_MASTER_YES; | |
915 | else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0) | |
916 | value = SSHCTL_MASTER_NO; | |
917 | else if (strcmp(arg, "auto") == 0) | |
918 | value = SSHCTL_MASTER_AUTO; | |
919 | else if (strcmp(arg, "ask") == 0) | |
920 | value = SSHCTL_MASTER_ASK; | |
921 | else if (strcmp(arg, "autoask") == 0) | |
922 | value = SSHCTL_MASTER_AUTO_ASK; | |
923 | else | |
924 | fatal("%.200s line %d: Bad ControlMaster argument.", | |
925 | filename, linenum); | |
926 | if (*activep && *intptr == -1) | |
927 | *intptr = value; | |
928 | break; | |
7e82606e | 929 | |
dfddba3d | 930 | case oHashKnownHosts: |
931 | intptr = &options->hash_known_hosts; | |
932 | goto parse_flag; | |
933 | ||
08822d99 | 934 | case oTunnel: |
935 | intptr = &options->tun_open; | |
936 | arg = strdelim(&s); | |
937 | if (!arg || *arg == '\0') | |
938 | fatal("%s line %d: Missing yes/point-to-point/" | |
939 | "ethernet/no argument.", filename, linenum); | |
940 | value = 0; /* silence compiler */ | |
941 | if (strcasecmp(arg, "ethernet") == 0) | |
942 | value = SSH_TUNMODE_ETHERNET; | |
943 | else if (strcasecmp(arg, "point-to-point") == 0) | |
944 | value = SSH_TUNMODE_POINTOPOINT; | |
945 | else if (strcasecmp(arg, "yes") == 0) | |
946 | value = SSH_TUNMODE_DEFAULT; | |
947 | else if (strcasecmp(arg, "no") == 0) | |
948 | value = SSH_TUNMODE_NO; | |
949 | else | |
950 | fatal("%s line %d: Bad yes/point-to-point/ethernet/" | |
951 | "no argument: %s", filename, linenum, arg); | |
952 | if (*activep) | |
953 | *intptr = value; | |
954 | break; | |
955 | ||
956 | case oTunnelDevice: | |
957 | arg = strdelim(&s); | |
958 | if (!arg || *arg == '\0') | |
959 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
960 | value = a2tun(arg, &value2); | |
961 | if (value == SSH_TUNID_ERR) | |
962 | fatal("%.200s line %d: Bad tun device.", filename, linenum); | |
963 | if (*activep) { | |
964 | options->tun_local = value; | |
965 | options->tun_remote = value2; | |
966 | } | |
967 | break; | |
968 | ||
969 | case oLocalCommand: | |
970 | charptr = &options->local_command; | |
971 | goto parse_command; | |
972 | ||
973 | case oPermitLocalCommand: | |
974 | intptr = &options->permit_local_command; | |
975 | goto parse_flag; | |
976 | ||
5156b1a1 | 977 | case oVisualHostKey: |
978 | intptr = &options->visual_host_key; | |
979 | goto parse_flag; | |
980 | ||
44a053a3 | 981 | case oDeprecated: |
982 | debug("%s line %d: Deprecated option \"%s\"", | |
983 | filename, linenum, keyword); | |
984 | return 0; | |
985 | ||
7cac2b65 | 986 | case oUnsupported: |
987 | error("%s line %d: Unsupported option \"%s\"", | |
988 | filename, linenum, keyword); | |
989 | return 0; | |
990 | ||
3c0ef626 | 991 | default: |
992 | fatal("process_config_line: Unimplemented opcode %d", opcode); | |
993 | } | |
994 | ||
995 | /* Check that there is no garbage at end of line. */ | |
996 | if ((arg = strdelim(&s)) != NULL && *arg != '\0') { | |
997 | fatal("%.200s line %d: garbage at end of line; \"%.200s\".", | |
2ce0bfe4 | 998 | filename, linenum, arg); |
3c0ef626 | 999 | } |
1000 | return 0; | |
1001 | } | |
1002 | ||
1003 | ||
1004 | /* | |
1005 | * Reads the config file and modifies the options accordingly. Options | |
1006 | * should already be initialized before this call. This never returns if | |
1007 | * there is an error. If the file does not exist, this returns 0. | |
1008 | */ | |
1009 | ||
1010 | int | |
7e82606e | 1011 | read_config_file(const char *filename, const char *host, Options *options, |
1012 | int checkperm) | |
3c0ef626 | 1013 | { |
1014 | FILE *f; | |
1015 | char line[1024]; | |
1016 | int active, linenum; | |
1017 | int bad_options = 0; | |
1018 | ||
1019 | /* Open the file. */ | |
7e82606e | 1020 | if ((f = fopen(filename, "r")) == NULL) |
3c0ef626 | 1021 | return 0; |
1022 | ||
7e82606e | 1023 | if (checkperm) { |
1024 | struct stat sb; | |
1025 | ||
1026 | if (fstat(fileno(f), &sb) == -1) | |
1027 | fatal("fstat %s: %s", filename, strerror(errno)); | |
1028 | if (((sb.st_uid != 0 && sb.st_uid != getuid()) || | |
1029 | (sb.st_mode & 022) != 0)) | |
1030 | fatal("Bad owner or permissions on %s", filename); | |
1031 | } | |
1032 | ||
3c0ef626 | 1033 | debug("Reading configuration data %.200s", filename); |
1034 | ||
1035 | /* | |
1036 | * Mark that we are now processing the options. This flag is turned | |
1037 | * on/off by Host specifications. | |
1038 | */ | |
1039 | active = 1; | |
1040 | linenum = 0; | |
1041 | while (fgets(line, sizeof(line), f)) { | |
1042 | /* Update line number counter. */ | |
1043 | linenum++; | |
1044 | if (process_config_line(options, host, line, filename, linenum, &active) != 0) | |
1045 | bad_options++; | |
1046 | } | |
1047 | fclose(f); | |
1048 | if (bad_options > 0) | |
1049 | fatal("%s: terminating, %d bad configuration options", | |
e9702f7d | 1050 | filename, bad_options); |
3c0ef626 | 1051 | return 1; |
1052 | } | |
1053 | ||
1054 | /* | |
1055 | * Initializes options to special values that indicate that they have not yet | |
1056 | * been set. Read_config_file will only set options with this value. Options | |
1057 | * are processed in the following order: command line, user config file, | |
1058 | * system config file. Last, fill_default_options is called. | |
1059 | */ | |
1060 | ||
1061 | void | |
1062 | initialize_options(Options * options) | |
1063 | { | |
1064 | memset(options, 'X', sizeof(*options)); | |
1065 | options->forward_agent = -1; | |
1066 | options->forward_x11 = -1; | |
540d72c3 | 1067 | options->forward_x11_trusted = -1; |
30460aeb | 1068 | options->exit_on_forward_failure = -1; |
3c0ef626 | 1069 | options->xauth_location = NULL; |
1070 | options->gateway_ports = -1; | |
1071 | options->use_privileged_port = -1; | |
3c0ef626 | 1072 | options->rsa_authentication = -1; |
1073 | options->pubkey_authentication = -1; | |
1074 | options->challenge_response_authentication = -1; | |
7cac2b65 | 1075 | options->gss_authentication = -1; |
7a056ed1 | 1076 | options->gss_keyex = -1; |
7cac2b65 | 1077 | options->gss_deleg_creds = -1; |
fe4ad273 | 1078 | options->gss_trust_dns = -1; |
3c0ef626 | 1079 | options->password_authentication = -1; |
1080 | options->kbd_interactive_authentication = -1; | |
1081 | options->kbd_interactive_devices = NULL; | |
1082 | options->rhosts_rsa_authentication = -1; | |
1083 | options->hostbased_authentication = -1; | |
3c0ef626 | 1084 | options->batch_mode = -1; |
1085 | options->check_host_ip = -1; | |
1086 | options->strict_host_key_checking = -1; | |
1087 | options->compression = -1; | |
540d72c3 | 1088 | options->tcp_keep_alive = -1; |
3c0ef626 | 1089 | options->compression_level = -1; |
1090 | options->port = -1; | |
7cac2b65 | 1091 | options->address_family = -1; |
3c0ef626 | 1092 | options->connection_attempts = -1; |
7cac2b65 | 1093 | options->connection_timeout = -1; |
3c0ef626 | 1094 | options->number_of_password_prompts = -1; |
1095 | options->cipher = -1; | |
1096 | options->ciphers = NULL; | |
1097 | options->macs = NULL; | |
1098 | options->hostkeyalgorithms = NULL; | |
1099 | options->protocol = SSH_PROTO_UNKNOWN; | |
1100 | options->num_identity_files = 0; | |
1101 | options->hostname = NULL; | |
1102 | options->host_key_alias = NULL; | |
1103 | options->proxy_command = NULL; | |
1104 | options->user = NULL; | |
1105 | options->escape_char = -1; | |
1106 | options->system_hostfile = NULL; | |
1107 | options->user_hostfile = NULL; | |
1108 | options->system_hostfile2 = NULL; | |
1109 | options->user_hostfile2 = NULL; | |
1110 | options->num_local_forwards = 0; | |
1111 | options->num_remote_forwards = 0; | |
1112 | options->clear_forwardings = -1; | |
e9702f7d | 1113 | options->log_level = SYSLOG_LEVEL_NOT_SET; |
3c0ef626 | 1114 | options->preferred_authentications = NULL; |
1115 | options->bind_address = NULL; | |
1116 | options->smartcard_device = NULL; | |
bfe49944 | 1117 | options->enable_ssh_keysign = - 1; |
3c0ef626 | 1118 | options->no_host_authentication_for_localhost = - 1; |
12a403af | 1119 | options->identities_only = - 1; |
7cac2b65 | 1120 | options->rekey_limit = - 1; |
1121 | options->verify_host_key_dns = -1; | |
540d72c3 | 1122 | options->server_alive_interval = -1; |
1123 | options->server_alive_count_max = -1; | |
7e82606e | 1124 | options->num_send_env = 0; |
1125 | options->control_path = NULL; | |
1126 | options->control_master = -1; | |
dfddba3d | 1127 | options->hash_known_hosts = -1; |
08822d99 | 1128 | options->tun_open = -1; |
1129 | options->tun_local = -1; | |
1130 | options->tun_remote = -1; | |
1131 | options->local_command = NULL; | |
1132 | options->permit_local_command = -1; | |
a7213e65 | 1133 | options->none_switch = -1; |
1134 | options->none_enabled = -1; | |
1135 | options->hpn_disabled = -1; | |
1136 | options->hpn_buffer_size = -1; | |
1137 | options->tcp_rcv_buf_poll = -1; | |
1138 | options->tcp_rcv_buf = -1; | |
5156b1a1 | 1139 | options->visual_host_key = -1; |
3c0ef626 | 1140 | } |
1141 | ||
1142 | /* | |
1143 | * Called after processing other sources of option data, this fills those | |
1144 | * options for which no value has been specified with their default values. | |
1145 | */ | |
1146 | ||
1147 | void | |
1148 | fill_default_options(Options * options) | |
1149 | { | |
1150 | int len; | |
1151 | ||
1152 | if (options->forward_agent == -1) | |
1153 | options->forward_agent = 0; | |
1154 | if (options->forward_x11 == -1) | |
1155 | options->forward_x11 = 0; | |
540d72c3 | 1156 | if (options->forward_x11_trusted == -1) |
1157 | options->forward_x11_trusted = 0; | |
30460aeb | 1158 | if (options->exit_on_forward_failure == -1) |
1159 | options->exit_on_forward_failure = 0; | |
3c0ef626 | 1160 | if (options->xauth_location == NULL) |
1161 | options->xauth_location = _PATH_XAUTH; | |
3c0ef626 | 1162 | if (options->gateway_ports == -1) |
1163 | options->gateway_ports = 0; | |
1164 | if (options->use_privileged_port == -1) | |
1165 | options->use_privileged_port = 0; | |
3c0ef626 | 1166 | if (options->rsa_authentication == -1) |
1167 | options->rsa_authentication = 1; | |
1168 | if (options->pubkey_authentication == -1) | |
1169 | options->pubkey_authentication = 1; | |
1170 | if (options->challenge_response_authentication == -1) | |
1171 | options->challenge_response_authentication = 1; | |
5598e598 | 1172 | if (options->gss_authentication == -1) |
1173 | options->gss_authentication = 1; | |
7a056ed1 | 1174 | if (options->gss_keyex == -1) |
1175 | options->gss_keyex = 1; | |
5598e598 | 1176 | if (options->gss_deleg_creds == -1) |
1177 | options->gss_deleg_creds = 1; | |
fe4ad273 | 1178 | if (options->gss_trust_dns == -1) |
1179 | options->gss_trust_dns = 1; | |
3c0ef626 | 1180 | if (options->password_authentication == -1) |
1181 | options->password_authentication = 1; | |
1182 | if (options->kbd_interactive_authentication == -1) | |
1183 | options->kbd_interactive_authentication = 1; | |
1184 | if (options->rhosts_rsa_authentication == -1) | |
44a053a3 | 1185 | options->rhosts_rsa_authentication = 0; |
3c0ef626 | 1186 | if (options->hostbased_authentication == -1) |
1187 | options->hostbased_authentication = 0; | |
3c0ef626 | 1188 | if (options->batch_mode == -1) |
1189 | options->batch_mode = 0; | |
1190 | if (options->check_host_ip == -1) | |
1191 | options->check_host_ip = 1; | |
1192 | if (options->strict_host_key_checking == -1) | |
1193 | options->strict_host_key_checking = 2; /* 2 is default */ | |
1194 | if (options->compression == -1) | |
1195 | options->compression = 0; | |
540d72c3 | 1196 | if (options->tcp_keep_alive == -1) |
1197 | options->tcp_keep_alive = 1; | |
3c0ef626 | 1198 | if (options->compression_level == -1) |
1199 | options->compression_level = 6; | |
1200 | if (options->port == -1) | |
1201 | options->port = 0; /* Filled in ssh_connect. */ | |
7cac2b65 | 1202 | if (options->address_family == -1) |
1203 | options->address_family = AF_UNSPEC; | |
3c0ef626 | 1204 | if (options->connection_attempts == -1) |
1205 | options->connection_attempts = 1; | |
1206 | if (options->number_of_password_prompts == -1) | |
1207 | options->number_of_password_prompts = 3; | |
1208 | /* Selected in ssh_login(). */ | |
1209 | if (options->cipher == -1) | |
1210 | options->cipher = SSH_CIPHER_NOT_SET; | |
1211 | /* options->ciphers, default set in myproposals.h */ | |
1212 | /* options->macs, default set in myproposals.h */ | |
1213 | /* options->hostkeyalgorithms, default set in myproposals.h */ | |
1214 | if (options->protocol == SSH_PROTO_UNKNOWN) | |
1215 | options->protocol = SSH_PROTO_1|SSH_PROTO_2; | |
1216 | if (options->num_identity_files == 0) { | |
1217 | if (options->protocol & SSH_PROTO_1) { | |
1218 | len = 2 + strlen(_PATH_SSH_CLIENT_IDENTITY) + 1; | |
1219 | options->identity_files[options->num_identity_files] = | |
1220 | xmalloc(len); | |
1221 | snprintf(options->identity_files[options->num_identity_files++], | |
1222 | len, "~/%.100s", _PATH_SSH_CLIENT_IDENTITY); | |
1223 | } | |
1224 | if (options->protocol & SSH_PROTO_2) { | |
1225 | len = 2 + strlen(_PATH_SSH_CLIENT_ID_RSA) + 1; | |
1226 | options->identity_files[options->num_identity_files] = | |
1227 | xmalloc(len); | |
1228 | snprintf(options->identity_files[options->num_identity_files++], | |
1229 | len, "~/%.100s", _PATH_SSH_CLIENT_ID_RSA); | |
1230 | ||
1231 | len = 2 + strlen(_PATH_SSH_CLIENT_ID_DSA) + 1; | |
1232 | options->identity_files[options->num_identity_files] = | |
1233 | xmalloc(len); | |
1234 | snprintf(options->identity_files[options->num_identity_files++], | |
1235 | len, "~/%.100s", _PATH_SSH_CLIENT_ID_DSA); | |
1236 | } | |
1237 | } | |
1238 | if (options->escape_char == -1) | |
1239 | options->escape_char = '~'; | |
1240 | if (options->system_hostfile == NULL) | |
1241 | options->system_hostfile = _PATH_SSH_SYSTEM_HOSTFILE; | |
1242 | if (options->user_hostfile == NULL) | |
1243 | options->user_hostfile = _PATH_SSH_USER_HOSTFILE; | |
1244 | if (options->system_hostfile2 == NULL) | |
1245 | options->system_hostfile2 = _PATH_SSH_SYSTEM_HOSTFILE2; | |
1246 | if (options->user_hostfile2 == NULL) | |
1247 | options->user_hostfile2 = _PATH_SSH_USER_HOSTFILE2; | |
e9702f7d | 1248 | if (options->log_level == SYSLOG_LEVEL_NOT_SET) |
3c0ef626 | 1249 | options->log_level = SYSLOG_LEVEL_INFO; |
1250 | if (options->clear_forwardings == 1) | |
1251 | clear_forwardings(options); | |
1252 | if (options->no_host_authentication_for_localhost == - 1) | |
1253 | options->no_host_authentication_for_localhost = 0; | |
12a403af | 1254 | if (options->identities_only == -1) |
1255 | options->identities_only = 0; | |
bfe49944 | 1256 | if (options->enable_ssh_keysign == -1) |
1257 | options->enable_ssh_keysign = 0; | |
7cac2b65 | 1258 | if (options->rekey_limit == -1) |
1259 | options->rekey_limit = 0; | |
1260 | if (options->verify_host_key_dns == -1) | |
1261 | options->verify_host_key_dns = 0; | |
540d72c3 | 1262 | if (options->server_alive_interval == -1) |
1263 | options->server_alive_interval = 0; | |
1264 | if (options->server_alive_count_max == -1) | |
1265 | options->server_alive_count_max = 3; | |
473db5ab | 1266 | if (options->none_switch == -1) |
1267 | options->none_switch = 0; | |
a7213e65 | 1268 | if (options->hpn_disabled == -1) |
1269 | options->hpn_disabled = 0; | |
f713db99 | 1270 | if (options->hpn_buffer_size > -1) |
1271 | { | |
6df46d40 | 1272 | /* if a user tries to set the size to 0 set it to 1KB */ |
a7213e65 | 1273 | if (options->hpn_buffer_size == 0) |
6df46d40 | 1274 | options->hpn_buffer_size = 1024; |
231cecf9 | 1275 | /*limit the buffer to 64MB*/ |
6df46d40 | 1276 | if (options->hpn_buffer_size > 65536) |
f713db99 | 1277 | { |
6df46d40 | 1278 | options->hpn_buffer_size = 65536*1024; |
231cecf9 | 1279 | debug("User requested buffer larger than 64MB. Request reverted to 64MB"); |
f713db99 | 1280 | } |
f713db99 | 1281 | debug("hpn_buffer_size set to %d", options->hpn_buffer_size); |
1282 | } | |
a7213e65 | 1283 | if (options->tcp_rcv_buf == 0) |
1284 | options->tcp_rcv_buf = 1; | |
1285 | if (options->tcp_rcv_buf > -1) | |
1286 | options->tcp_rcv_buf *=1024; | |
6df46d40 | 1287 | if (options->tcp_rcv_buf_poll == -1) |
1288 | options->tcp_rcv_buf_poll = 1; | |
7e82606e | 1289 | if (options->control_master == -1) |
1290 | options->control_master = 0; | |
dfddba3d | 1291 | if (options->hash_known_hosts == -1) |
1292 | options->hash_known_hosts = 0; | |
08822d99 | 1293 | if (options->tun_open == -1) |
1294 | options->tun_open = SSH_TUNMODE_NO; | |
1295 | if (options->tun_local == -1) | |
1296 | options->tun_local = SSH_TUNID_ANY; | |
1297 | if (options->tun_remote == -1) | |
1298 | options->tun_remote = SSH_TUNID_ANY; | |
1299 | if (options->permit_local_command == -1) | |
1300 | options->permit_local_command = 0; | |
5156b1a1 | 1301 | if (options->visual_host_key == -1) |
1302 | options->visual_host_key = 0; | |
08822d99 | 1303 | /* options->local_command should not be set by default */ |
3c0ef626 | 1304 | /* options->proxy_command should not be set by default */ |
1305 | /* options->user will be set in the main program if appropriate */ | |
1306 | /* options->hostname will be set in the main program if appropriate */ | |
1307 | /* options->host_key_alias should not be set by default */ | |
1308 | /* options->preferred_authentications will be set in ssh */ | |
1309 | } | |
dfddba3d | 1310 | |
1311 | /* | |
1312 | * parse_forward | |
1313 | * parses a string containing a port forwarding specification of the form: | |
1314 | * [listenhost:]listenport:connecthost:connectport | |
1315 | * returns number of arguments parsed or zero on error | |
1316 | */ | |
1317 | int | |
1318 | parse_forward(Forward *fwd, const char *fwdspec) | |
1319 | { | |
1320 | int i; | |
1321 | char *p, *cp, *fwdarg[4]; | |
1322 | ||
1323 | memset(fwd, '\0', sizeof(*fwd)); | |
1324 | ||
1325 | cp = p = xstrdup(fwdspec); | |
1326 | ||
1327 | /* skip leading spaces */ | |
fa0f0f45 | 1328 | while (isspace(*cp)) |
dfddba3d | 1329 | cp++; |
1330 | ||
1331 | for (i = 0; i < 4; ++i) | |
1332 | if ((fwdarg[i] = hpdelim(&cp)) == NULL) | |
1333 | break; | |
1334 | ||
1335 | /* Check for trailing garbage in 4-arg case*/ | |
1336 | if (cp != NULL) | |
1337 | i = 0; /* failure */ | |
1338 | ||
1339 | switch (i) { | |
1340 | case 3: | |
1341 | fwd->listen_host = NULL; | |
1342 | fwd->listen_port = a2port(fwdarg[0]); | |
1343 | fwd->connect_host = xstrdup(cleanhostname(fwdarg[1])); | |
1344 | fwd->connect_port = a2port(fwdarg[2]); | |
1345 | break; | |
1346 | ||
1347 | case 4: | |
1348 | fwd->listen_host = xstrdup(cleanhostname(fwdarg[0])); | |
1349 | fwd->listen_port = a2port(fwdarg[1]); | |
1350 | fwd->connect_host = xstrdup(cleanhostname(fwdarg[2])); | |
1351 | fwd->connect_port = a2port(fwdarg[3]); | |
1352 | break; | |
1353 | default: | |
1354 | i = 0; /* failure */ | |
1355 | } | |
1356 | ||
1357 | xfree(p); | |
1358 | ||
e74dc197 | 1359 | if (fwd->listen_port == 0 || fwd->connect_port == 0) |
dfddba3d | 1360 | goto fail_free; |
1361 | ||
1362 | if (fwd->connect_host != NULL && | |
1363 | strlen(fwd->connect_host) >= NI_MAXHOST) | |
1364 | goto fail_free; | |
1365 | ||
1366 | return (i); | |
1367 | ||
1368 | fail_free: | |
1369 | if (fwd->connect_host != NULL) | |
1370 | xfree(fwd->connect_host); | |
1371 | if (fwd->listen_host != NULL) | |
1372 | xfree(fwd->listen_host); | |
1373 | return (0); | |
1374 | } |