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c462cd6f | 1 | /* $OpenBSD: readconf.c,v 1.163 2007/10/22 19:10:24 markus Exp $ */ |
8efc0c15 | 2 | /* |
5260325f | 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
5260325f | 4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
5 | * All rights reserved | |
5260325f | 6 | * Functions for reading the configuration files. |
6ae2364d | 7 | * |
bcbf86ec | 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". | |
5260325f | 13 | */ |
8efc0c15 | 14 | |
15 | #include "includes.h" | |
4095f623 | 16 | |
17 | #include <sys/types.h> | |
18 | #include <sys/stat.h> | |
9794d008 | 19 | #include <sys/socket.h> |
20 | ||
21 | #include <netinet/in.h> | |
8efc0c15 | 22 | |
b6438382 | 23 | #include <ctype.h> |
028094f4 | 24 | #include <errno.h> |
28cb0a43 | 25 | #include <netdb.h> |
31652869 | 26 | #include <signal.h> |
24436b92 | 27 | #include <stdarg.h> |
cf851879 | 28 | #include <stdio.h> |
00146caa | 29 | #include <string.h> |
5188ba17 | 30 | #include <unistd.h> |
b6438382 | 31 | |
8efc0c15 | 32 | #include "xmalloc.h" |
31652869 | 33 | #include "ssh.h" |
a8be9f80 | 34 | #include "compat.h" |
42f11eb2 | 35 | #include "cipher.h" |
36 | #include "pathnames.h" | |
37 | #include "log.h" | |
31652869 | 38 | #include "key.h" |
42f11eb2 | 39 | #include "readconf.h" |
40 | #include "match.h" | |
41 | #include "misc.h" | |
31652869 | 42 | #include "buffer.h" |
b2552997 | 43 | #include "kex.h" |
44 | #include "mac.h" | |
8efc0c15 | 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 | |
80fcb74e | 61 | User foo |
8efc0c15 | 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 | |
8efc0c15 | 77 | PasswordAuthentication no |
78 | ||
79 | Host puukko.hut.fi | |
80 | User t35124p | |
81 | ProxyCommand ssh-proxy %h %p | |
82 | ||
83 | Host *.fr | |
80fcb74e | 84 | PublicKeyAuthentication no |
8efc0c15 | 85 | |
86 | Host *.su | |
87 | Cipher none | |
88 | PasswordAuthentication no | |
89 | ||
d20f3c9e | 90 | Host vpn.fake.com |
91 | Tunnel yes | |
92 | TunnelDevice 3 | |
93 | ||
8efc0c15 | 94 | # Defaults for various options |
95 | Host * | |
96 | ForwardAgent no | |
fa08c86b | 97 | ForwardX11 no |
8efc0c15 | 98 | PasswordAuthentication yes |
99 | RSAAuthentication yes | |
100 | RhostsRSAAuthentication yes | |
8efc0c15 | 101 | StrictHostKeyChecking yes |
fd573618 | 102 | TcpKeepAlive no |
8efc0c15 | 103 | IdentityFile ~/.ssh/identity |
104 | Port 22 | |
105 | EscapeChar ~ | |
106 | ||
107 | */ | |
108 | ||
109 | /* Keyword tokens. */ | |
110 | ||
5260325f | 111 | typedef enum { |
112 | oBadOption, | |
d73a67d7 | 113 | oForwardAgent, oForwardX11, oForwardX11Trusted, oGatewayPorts, |
42ea6f5e | 114 | oExitOnForwardFailure, |
7203d6bb | 115 | oPasswordAuthentication, oRSAAuthentication, |
d464095c | 116 | oChallengeResponseAuthentication, oXAuthLocation, |
5260325f | 117 | oIdentityFile, oHostName, oPort, oCipher, oRemoteForward, oLocalForward, |
118 | oUser, oHost, oEscapeChar, oRhostsRSAAuthentication, oProxyCommand, | |
119 | oGlobalKnownHostsFile, oUserKnownHostsFile, oConnectionAttempts, | |
120 | oBatchMode, oCheckHostIP, oStrictHostKeyChecking, oCompression, | |
fd573618 | 121 | oCompressionLevel, oTCPKeepAlive, oNumberOfPasswordPrompts, |
b2552997 | 122 | oUsePrivilegedPort, oLogLevel, oCiphers, oProtocol, oMacs, |
fa08c86b | 123 | oGlobalKnownHostsFile2, oUserKnownHostsFile2, oPubkeyAuthentication, |
cab80f75 | 124 | oKbdInteractiveAuthentication, oKbdInteractiveDevices, oHostKeyAlias, |
e961a8f9 | 125 | oDynamicForward, oPreferredAuthentications, oHostbasedAuthentication, |
e1c5bfaf | 126 | oHostKeyAlgorithms, oBindAddress, oSmartcardDevice, |
80fcb74e | 127 | oClearAllForwardings, oNoHostAuthenticationForLocalhost, |
09ab3296 | 128 | oEnableSSHKeysign, oRekeyLimit, oVerifyHostKeyDNS, oConnectTimeout, |
7364bd04 | 129 | oAddressFamily, oGssAuthentication, oGssDelegateCreds, |
3a065ed0 | 130 | oServerAliveInterval, oServerAliveCountMax, oIdentitiesOnly, |
5c63c2ab | 131 | oSendEnv, oControlPath, oControlMaster, oHashKnownHosts, |
d20f3c9e | 132 | oTunnel, oTunnelDevice, oLocalCommand, oPermitLocalCommand, |
a2144546 | 133 | oDeprecated, oUnsupported |
8efc0c15 | 134 | } OpCodes; |
135 | ||
136 | /* Textual representations of the tokens. */ | |
137 | ||
5260325f | 138 | static struct { |
139 | const char *name; | |
140 | OpCodes opcode; | |
141 | } keywords[] = { | |
142 | { "forwardagent", oForwardAgent }, | |
143 | { "forwardx11", oForwardX11 }, | |
d73a67d7 | 144 | { "forwardx11trusted", oForwardX11Trusted }, |
42ea6f5e | 145 | { "exitonforwardfailure", oExitOnForwardFailure }, |
fa649821 | 146 | { "xauthlocation", oXAuthLocation }, |
5260325f | 147 | { "gatewayports", oGatewayPorts }, |
148 | { "useprivilegedport", oUsePrivilegedPort }, | |
0598d99d | 149 | { "rhostsauthentication", oDeprecated }, |
5260325f | 150 | { "passwordauthentication", oPasswordAuthentication }, |
94ec8c6b | 151 | { "kbdinteractiveauthentication", oKbdInteractiveAuthentication }, |
152 | { "kbdinteractivedevices", oKbdInteractiveDevices }, | |
5260325f | 153 | { "rsaauthentication", oRSAAuthentication }, |
fa08c86b | 154 | { "pubkeyauthentication", oPubkeyAuthentication }, |
d464095c | 155 | { "dsaauthentication", oPubkeyAuthentication }, /* alias */ |
8002af61 | 156 | { "rhostsrsaauthentication", oRhostsRSAAuthentication }, |
0140e66a | 157 | { "hostbasedauthentication", oHostbasedAuthentication }, |
d464095c | 158 | { "challengeresponseauthentication", oChallengeResponseAuthentication }, |
159 | { "skeyauthentication", oChallengeResponseAuthentication }, /* alias */ | |
160 | { "tisauthentication", oChallengeResponseAuthentication }, /* alias */ | |
a2144546 | 161 | { "kerberosauthentication", oUnsupported }, |
162 | { "kerberostgtpassing", oUnsupported }, | |
a2144546 | 163 | { "afstokenpassing", oUnsupported }, |
7364bd04 | 164 | #if defined(GSSAPI) |
165 | { "gssapiauthentication", oGssAuthentication }, | |
7364bd04 | 166 | { "gssapidelegatecredentials", oGssDelegateCreds }, |
167 | #else | |
168 | { "gssapiauthentication", oUnsupported }, | |
169 | { "gssapidelegatecredentials", oUnsupported }, | |
170 | #endif | |
80fcb74e | 171 | { "fallbacktorsh", oDeprecated }, |
172 | { "usersh", oDeprecated }, | |
5260325f | 173 | { "identityfile", oIdentityFile }, |
fa08c86b | 174 | { "identityfile2", oIdentityFile }, /* alias */ |
3a065ed0 | 175 | { "identitiesonly", oIdentitiesOnly }, |
5260325f | 176 | { "hostname", oHostName }, |
8abcdba4 | 177 | { "hostkeyalias", oHostKeyAlias }, |
5260325f | 178 | { "proxycommand", oProxyCommand }, |
179 | { "port", oPort }, | |
180 | { "cipher", oCipher }, | |
a8be9f80 | 181 | { "ciphers", oCiphers }, |
b2552997 | 182 | { "macs", oMacs }, |
a8be9f80 | 183 | { "protocol", oProtocol }, |
5260325f | 184 | { "remoteforward", oRemoteForward }, |
185 | { "localforward", oLocalForward }, | |
186 | { "user", oUser }, | |
187 | { "host", oHost }, | |
188 | { "escapechar", oEscapeChar }, | |
5260325f | 189 | { "globalknownhostsfile", oGlobalKnownHostsFile }, |
f49bc4f7 | 190 | { "userknownhostsfile", oUserKnownHostsFile }, /* obsolete */ |
a306f2dd | 191 | { "globalknownhostsfile2", oGlobalKnownHostsFile2 }, |
f49bc4f7 | 192 | { "userknownhostsfile2", oUserKnownHostsFile2 }, /* obsolete */ |
5260325f | 193 | { "connectionattempts", oConnectionAttempts }, |
194 | { "batchmode", oBatchMode }, | |
195 | { "checkhostip", oCheckHostIP }, | |
196 | { "stricthostkeychecking", oStrictHostKeyChecking }, | |
197 | { "compression", oCompression }, | |
198 | { "compressionlevel", oCompressionLevel }, | |
fd573618 | 199 | { "tcpkeepalive", oTCPKeepAlive }, |
200 | { "keepalive", oTCPKeepAlive }, /* obsolete */ | |
5260325f | 201 | { "numberofpasswordprompts", oNumberOfPasswordPrompts }, |
5260325f | 202 | { "loglevel", oLogLevel }, |
0490e609 | 203 | { "dynamicforward", oDynamicForward }, |
cab80f75 | 204 | { "preferredauthentications", oPreferredAuthentications }, |
e961a8f9 | 205 | { "hostkeyalgorithms", oHostKeyAlgorithms }, |
3435f5a6 | 206 | { "bindaddress", oBindAddress }, |
a2144546 | 207 | #ifdef SMARTCARD |
eea098a3 | 208 | { "smartcarddevice", oSmartcardDevice }, |
a2144546 | 209 | #else |
210 | { "smartcarddevice", oUnsupported }, | |
211 | #endif | |
184eed6a | 212 | { "clearallforwardings", oClearAllForwardings }, |
cc46e2ee | 213 | { "enablesshkeysign", oEnableSSHKeysign }, |
21289cd0 | 214 | { "verifyhostkeydns", oVerifyHostKeyDNS }, |
184eed6a | 215 | { "nohostauthenticationforlocalhost", oNoHostAuthenticationForLocalhost }, |
ffd7b36b | 216 | { "rekeylimit", oRekeyLimit }, |
09ab3296 | 217 | { "connecttimeout", oConnectTimeout }, |
f811e52a | 218 | { "addressfamily", oAddressFamily }, |
5d8d32a3 | 219 | { "serveraliveinterval", oServerAliveInterval }, |
220 | { "serveralivecountmax", oServerAliveCountMax }, | |
61a2c1da | 221 | { "sendenv", oSendEnv }, |
5e96b616 | 222 | { "controlpath", oControlPath }, |
223 | { "controlmaster", oControlMaster }, | |
5c63c2ab | 224 | { "hashknownhosts", oHashKnownHosts }, |
d20f3c9e | 225 | { "tunnel", oTunnel }, |
226 | { "tunneldevice", oTunnelDevice }, | |
227 | { "localcommand", oLocalCommand }, | |
228 | { "permitlocalcommand", oPermitLocalCommand }, | |
17a3011c | 229 | { NULL, oBadOption } |
6a17f9c2 | 230 | }; |
231 | ||
aa3378df | 232 | /* |
233 | * Adds a local TCP/IP port forward to options. Never returns if there is an | |
234 | * error. | |
235 | */ | |
8efc0c15 | 236 | |
6ae2364d | 237 | void |
3867aa0a | 238 | add_local_forward(Options *options, const Forward *newfwd) |
8efc0c15 | 239 | { |
5260325f | 240 | Forward *fwd; |
e6f15ed1 | 241 | #ifndef NO_IPPORT_RESERVED_CONCEPT |
5260325f | 242 | extern uid_t original_real_uid; |
3867aa0a | 243 | if (newfwd->listen_port < IPPORT_RESERVED && original_real_uid != 0) |
54b974dc | 244 | fatal("Privileged ports can only be forwarded by root."); |
3c62e7eb | 245 | #endif |
5260325f | 246 | if (options->num_local_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION) |
247 | fatal("Too many local forwards (max %d).", SSH_MAX_FORWARDS_PER_DIRECTION); | |
248 | fwd = &options->local_forwards[options->num_local_forwards++]; | |
3867aa0a | 249 | |
250 | fwd->listen_host = (newfwd->listen_host == NULL) ? | |
251 | NULL : xstrdup(newfwd->listen_host); | |
252 | fwd->listen_port = newfwd->listen_port; | |
253 | fwd->connect_host = xstrdup(newfwd->connect_host); | |
254 | fwd->connect_port = newfwd->connect_port; | |
8efc0c15 | 255 | } |
256 | ||
aa3378df | 257 | /* |
258 | * Adds a remote TCP/IP port forward to options. Never returns if there is | |
259 | * an error. | |
260 | */ | |
8efc0c15 | 261 | |
6ae2364d | 262 | void |
3867aa0a | 263 | add_remote_forward(Options *options, const Forward *newfwd) |
8efc0c15 | 264 | { |
5260325f | 265 | Forward *fwd; |
266 | if (options->num_remote_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
267 | fatal("Too many remote forwards (max %d).", | |
184eed6a | 268 | SSH_MAX_FORWARDS_PER_DIRECTION); |
5260325f | 269 | fwd = &options->remote_forwards[options->num_remote_forwards++]; |
3867aa0a | 270 | |
271 | fwd->listen_host = (newfwd->listen_host == NULL) ? | |
272 | NULL : xstrdup(newfwd->listen_host); | |
273 | fwd->listen_port = newfwd->listen_port; | |
274 | fwd->connect_host = xstrdup(newfwd->connect_host); | |
275 | fwd->connect_port = newfwd->connect_port; | |
8efc0c15 | 276 | } |
277 | ||
e1c5bfaf | 278 | static void |
279 | clear_forwardings(Options *options) | |
280 | { | |
281 | int i; | |
282 | ||
3867aa0a | 283 | for (i = 0; i < options->num_local_forwards; i++) { |
2b74a069 | 284 | if (options->local_forwards[i].listen_host != NULL) |
285 | xfree(options->local_forwards[i].listen_host); | |
3867aa0a | 286 | xfree(options->local_forwards[i].connect_host); |
287 | } | |
e1c5bfaf | 288 | options->num_local_forwards = 0; |
3867aa0a | 289 | for (i = 0; i < options->num_remote_forwards; i++) { |
2b74a069 | 290 | if (options->remote_forwards[i].listen_host != NULL) |
291 | xfree(options->remote_forwards[i].listen_host); | |
3867aa0a | 292 | xfree(options->remote_forwards[i].connect_host); |
293 | } | |
e1c5bfaf | 294 | options->num_remote_forwards = 0; |
a4f24bf8 | 295 | options->tun_open = SSH_TUNMODE_NO; |
e1c5bfaf | 296 | } |
297 | ||
aa3378df | 298 | /* |
6be9a5e8 | 299 | * Returns the number of the token pointed to by cp or oBadOption. |
aa3378df | 300 | */ |
8efc0c15 | 301 | |
6ae2364d | 302 | static OpCodes |
5260325f | 303 | parse_token(const char *cp, const char *filename, int linenum) |
8efc0c15 | 304 | { |
1e3b8b07 | 305 | u_int i; |
8efc0c15 | 306 | |
5260325f | 307 | for (i = 0; keywords[i].name; i++) |
aa3378df | 308 | if (strcasecmp(cp, keywords[i].name) == 0) |
5260325f | 309 | return keywords[i].opcode; |
8efc0c15 | 310 | |
b7c70970 | 311 | error("%s: line %d: Bad configuration option: %s", |
312 | filename, linenum, cp); | |
5260325f | 313 | return oBadOption; |
8efc0c15 | 314 | } |
315 | ||
aa3378df | 316 | /* |
317 | * Processes a single option line as used in the configuration files. This | |
318 | * only sets those values that have not already been set. | |
319 | */ | |
d718e75d | 320 | #define WHITESPACE " \t\r\n" |
8efc0c15 | 321 | |
e7c0f9d5 | 322 | int |
323 | process_config_line(Options *options, const char *host, | |
5260325f | 324 | char *line, const char *filename, int linenum, |
325 | int *activep) | |
8efc0c15 | 326 | { |
3867aa0a | 327 | char *s, **charptr, *endofnumber, *keyword, *arg, *arg2, fwdarg[256]; |
129d5252 | 328 | int opcode, *intptr, value, value2, scale; |
329 | long long orig, val64; | |
d718e75d | 330 | size_t len; |
3867aa0a | 331 | Forward fwd; |
5260325f | 332 | |
204fde99 | 333 | /* Strip trailing whitespace */ |
f8cc7664 | 334 | for (len = strlen(line) - 1; len > 0; len--) { |
204fde99 | 335 | if (strchr(WHITESPACE, line[len]) == NULL) |
336 | break; | |
337 | line[len] = '\0'; | |
338 | } | |
339 | ||
704b1659 | 340 | s = line; |
341 | /* Get the keyword. (Each line is supposed to begin with a keyword). */ | |
88299971 | 342 | if ((keyword = strdelim(&s)) == NULL) |
343 | return 0; | |
704b1659 | 344 | /* Ignore leading whitespace. */ |
345 | if (*keyword == '\0') | |
346 | keyword = strdelim(&s); | |
42f11eb2 | 347 | if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#') |
5260325f | 348 | return 0; |
349 | ||
089fbbd2 | 350 | opcode = parse_token(keyword, filename, linenum); |
5260325f | 351 | |
352 | switch (opcode) { | |
353 | case oBadOption: | |
aa3378df | 354 | /* don't panic, but count bad options */ |
355 | return -1; | |
5260325f | 356 | /* NOTREACHED */ |
09ab3296 | 357 | case oConnectTimeout: |
358 | intptr = &options->connection_timeout; | |
5d8d32a3 | 359 | parse_time: |
09ab3296 | 360 | arg = strdelim(&s); |
361 | if (!arg || *arg == '\0') | |
362 | fatal("%s line %d: missing time value.", | |
363 | filename, linenum); | |
364 | if ((value = convtime(arg)) == -1) | |
365 | fatal("%s line %d: invalid time value.", | |
366 | filename, linenum); | |
7f650171 | 367 | if (*activep && *intptr == -1) |
09ab3296 | 368 | *intptr = value; |
369 | break; | |
370 | ||
5260325f | 371 | case oForwardAgent: |
372 | intptr = &options->forward_agent; | |
373 | parse_flag: | |
704b1659 | 374 | arg = strdelim(&s); |
089fbbd2 | 375 | if (!arg || *arg == '\0') |
5260325f | 376 | fatal("%.200s line %d: Missing yes/no argument.", filename, linenum); |
377 | value = 0; /* To avoid compiler warning... */ | |
089fbbd2 | 378 | if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0) |
5260325f | 379 | value = 1; |
089fbbd2 | 380 | else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0) |
5260325f | 381 | value = 0; |
382 | else | |
383 | fatal("%.200s line %d: Bad yes/no argument.", filename, linenum); | |
384 | if (*activep && *intptr == -1) | |
385 | *intptr = value; | |
386 | break; | |
387 | ||
388 | case oForwardX11: | |
389 | intptr = &options->forward_x11; | |
390 | goto parse_flag; | |
391 | ||
d73a67d7 | 392 | case oForwardX11Trusted: |
393 | intptr = &options->forward_x11_trusted; | |
394 | goto parse_flag; | |
395 | ||
5260325f | 396 | case oGatewayPorts: |
397 | intptr = &options->gateway_ports; | |
398 | goto parse_flag; | |
399 | ||
42ea6f5e | 400 | case oExitOnForwardFailure: |
401 | intptr = &options->exit_on_forward_failure; | |
402 | goto parse_flag; | |
403 | ||
5260325f | 404 | case oUsePrivilegedPort: |
405 | intptr = &options->use_privileged_port; | |
406 | goto parse_flag; | |
407 | ||
5260325f | 408 | case oPasswordAuthentication: |
409 | intptr = &options->password_authentication; | |
410 | goto parse_flag; | |
411 | ||
94ec8c6b | 412 | case oKbdInteractiveAuthentication: |
413 | intptr = &options->kbd_interactive_authentication; | |
414 | goto parse_flag; | |
415 | ||
416 | case oKbdInteractiveDevices: | |
417 | charptr = &options->kbd_interactive_devices; | |
418 | goto parse_string; | |
419 | ||
fa08c86b | 420 | case oPubkeyAuthentication: |
421 | intptr = &options->pubkey_authentication; | |
1d1ffb87 | 422 | goto parse_flag; |
423 | ||
5260325f | 424 | case oRSAAuthentication: |
425 | intptr = &options->rsa_authentication; | |
426 | goto parse_flag; | |
427 | ||
428 | case oRhostsRSAAuthentication: | |
429 | intptr = &options->rhosts_rsa_authentication; | |
430 | goto parse_flag; | |
431 | ||
8002af61 | 432 | case oHostbasedAuthentication: |
433 | intptr = &options->hostbased_authentication; | |
434 | goto parse_flag; | |
435 | ||
d464095c | 436 | case oChallengeResponseAuthentication: |
5ba55ada | 437 | intptr = &options->challenge_response_authentication; |
5260325f | 438 | goto parse_flag; |
d0ec7f42 | 439 | |
7364bd04 | 440 | case oGssAuthentication: |
441 | intptr = &options->gss_authentication; | |
442 | goto parse_flag; | |
443 | ||
444 | case oGssDelegateCreds: | |
445 | intptr = &options->gss_deleg_creds; | |
446 | goto parse_flag; | |
447 | ||
5260325f | 448 | case oBatchMode: |
449 | intptr = &options->batch_mode; | |
450 | goto parse_flag; | |
451 | ||
452 | case oCheckHostIP: | |
453 | intptr = &options->check_host_ip; | |
454 | goto parse_flag; | |
455 | ||
21289cd0 | 456 | case oVerifyHostKeyDNS: |
457 | intptr = &options->verify_host_key_dns; | |
0161a13d | 458 | goto parse_yesnoask; |
21289cd0 | 459 | |
5260325f | 460 | case oStrictHostKeyChecking: |
461 | intptr = &options->strict_host_key_checking; | |
0161a13d | 462 | parse_yesnoask: |
704b1659 | 463 | arg = strdelim(&s); |
089fbbd2 | 464 | if (!arg || *arg == '\0') |
c76c8819 | 465 | fatal("%.200s line %d: Missing yes/no/ask argument.", |
184eed6a | 466 | filename, linenum); |
5260325f | 467 | value = 0; /* To avoid compiler warning... */ |
089fbbd2 | 468 | if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0) |
5260325f | 469 | value = 1; |
089fbbd2 | 470 | else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0) |
5260325f | 471 | value = 0; |
089fbbd2 | 472 | else if (strcmp(arg, "ask") == 0) |
5260325f | 473 | value = 2; |
474 | else | |
475 | fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum); | |
476 | if (*activep && *intptr == -1) | |
477 | *intptr = value; | |
478 | break; | |
479 | ||
480 | case oCompression: | |
481 | intptr = &options->compression; | |
482 | goto parse_flag; | |
483 | ||
fd573618 | 484 | case oTCPKeepAlive: |
485 | intptr = &options->tcp_keep_alive; | |
5260325f | 486 | goto parse_flag; |
487 | ||
8bbc048a | 488 | case oNoHostAuthenticationForLocalhost: |
489 | intptr = &options->no_host_authentication_for_localhost; | |
490 | goto parse_flag; | |
491 | ||
5260325f | 492 | case oNumberOfPasswordPrompts: |
493 | intptr = &options->number_of_password_prompts; | |
494 | goto parse_int; | |
495 | ||
496 | case oCompressionLevel: | |
497 | intptr = &options->compression_level; | |
498 | goto parse_int; | |
499 | ||
ffd7b36b | 500 | case oRekeyLimit: |
501 | intptr = &options->rekey_limit; | |
502 | arg = strdelim(&s); | |
503 | if (!arg || *arg == '\0') | |
504 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
505 | if (arg[0] < '0' || arg[0] > '9') | |
506 | fatal("%.200s line %d: Bad number.", filename, linenum); | |
129d5252 | 507 | orig = val64 = strtoll(arg, &endofnumber, 10); |
ffd7b36b | 508 | if (arg == endofnumber) |
509 | fatal("%.200s line %d: Bad number.", filename, linenum); | |
510 | switch (toupper(*endofnumber)) { | |
129d5252 | 511 | case '\0': |
512 | scale = 1; | |
513 | break; | |
ffd7b36b | 514 | case 'K': |
129d5252 | 515 | scale = 1<<10; |
ffd7b36b | 516 | break; |
517 | case 'M': | |
129d5252 | 518 | scale = 1<<20; |
ffd7b36b | 519 | break; |
520 | case 'G': | |
129d5252 | 521 | scale = 1<<30; |
ffd7b36b | 522 | break; |
129d5252 | 523 | default: |
524 | fatal("%.200s line %d: Invalid RekeyLimit suffix", | |
525 | filename, linenum); | |
ffd7b36b | 526 | } |
129d5252 | 527 | val64 *= scale; |
528 | /* detect integer wrap and too-large limits */ | |
529 | if ((val64 / scale) != orig || val64 > INT_MAX) | |
530 | fatal("%.200s line %d: RekeyLimit too large", | |
531 | filename, linenum); | |
532 | if (val64 < 16) | |
533 | fatal("%.200s line %d: RekeyLimit too small", | |
534 | filename, linenum); | |
ffd7b36b | 535 | if (*activep && *intptr == -1) |
129d5252 | 536 | *intptr = (int)val64; |
ffd7b36b | 537 | break; |
538 | ||
5260325f | 539 | case oIdentityFile: |
704b1659 | 540 | arg = strdelim(&s); |
089fbbd2 | 541 | if (!arg || *arg == '\0') |
5260325f | 542 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
543 | if (*activep) { | |
fa08c86b | 544 | intptr = &options->num_identity_files; |
a306f2dd | 545 | if (*intptr >= SSH_MAX_IDENTITY_FILES) |
5260325f | 546 | fatal("%.200s line %d: Too many identity files specified (max %d).", |
184eed6a | 547 | filename, linenum, SSH_MAX_IDENTITY_FILES); |
0cf6a024 | 548 | charptr = &options->identity_files[*intptr]; |
089fbbd2 | 549 | *charptr = xstrdup(arg); |
a306f2dd | 550 | *intptr = *intptr + 1; |
5260325f | 551 | } |
552 | break; | |
553 | ||
fa649821 | 554 | case oXAuthLocation: |
555 | charptr=&options->xauth_location; | |
556 | goto parse_string; | |
557 | ||
5260325f | 558 | case oUser: |
559 | charptr = &options->user; | |
560 | parse_string: | |
704b1659 | 561 | arg = strdelim(&s); |
089fbbd2 | 562 | if (!arg || *arg == '\0') |
5260325f | 563 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
564 | if (*activep && *charptr == NULL) | |
089fbbd2 | 565 | *charptr = xstrdup(arg); |
5260325f | 566 | break; |
567 | ||
568 | case oGlobalKnownHostsFile: | |
569 | charptr = &options->system_hostfile; | |
570 | goto parse_string; | |
571 | ||
572 | case oUserKnownHostsFile: | |
573 | charptr = &options->user_hostfile; | |
574 | goto parse_string; | |
575 | ||
a306f2dd | 576 | case oGlobalKnownHostsFile2: |
577 | charptr = &options->system_hostfile2; | |
578 | goto parse_string; | |
579 | ||
580 | case oUserKnownHostsFile2: | |
581 | charptr = &options->user_hostfile2; | |
582 | goto parse_string; | |
583 | ||
5260325f | 584 | case oHostName: |
585 | charptr = &options->hostname; | |
586 | goto parse_string; | |
587 | ||
8abcdba4 | 588 | case oHostKeyAlias: |
589 | charptr = &options->host_key_alias; | |
590 | goto parse_string; | |
591 | ||
cab80f75 | 592 | case oPreferredAuthentications: |
593 | charptr = &options->preferred_authentications; | |
594 | goto parse_string; | |
595 | ||
3435f5a6 | 596 | case oBindAddress: |
597 | charptr = &options->bind_address; | |
598 | goto parse_string; | |
599 | ||
eea098a3 | 600 | case oSmartcardDevice: |
9ff6f66f | 601 | charptr = &options->smartcard_device; |
602 | goto parse_string; | |
eea098a3 | 603 | |
5260325f | 604 | case oProxyCommand: |
d20f3c9e | 605 | charptr = &options->proxy_command; |
606 | parse_command: | |
2d9c1828 | 607 | if (s == NULL) |
608 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
d718e75d | 609 | len = strspn(s, WHITESPACE "="); |
5260325f | 610 | if (*activep && *charptr == NULL) |
d718e75d | 611 | *charptr = xstrdup(s + len); |
5260325f | 612 | return 0; |
613 | ||
614 | case oPort: | |
615 | intptr = &options->port; | |
616 | parse_int: | |
704b1659 | 617 | arg = strdelim(&s); |
089fbbd2 | 618 | if (!arg || *arg == '\0') |
5260325f | 619 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
089fbbd2 | 620 | if (arg[0] < '0' || arg[0] > '9') |
5260325f | 621 | fatal("%.200s line %d: Bad number.", filename, linenum); |
aa3378df | 622 | |
623 | /* Octal, decimal, or hex format? */ | |
089fbbd2 | 624 | value = strtol(arg, &endofnumber, 0); |
625 | if (arg == endofnumber) | |
aa3378df | 626 | fatal("%.200s line %d: Bad number.", filename, linenum); |
5260325f | 627 | if (*activep && *intptr == -1) |
628 | *intptr = value; | |
629 | break; | |
630 | ||
631 | case oConnectionAttempts: | |
632 | intptr = &options->connection_attempts; | |
633 | goto parse_int; | |
634 | ||
635 | case oCipher: | |
636 | intptr = &options->cipher; | |
704b1659 | 637 | arg = strdelim(&s); |
089fbbd2 | 638 | if (!arg || *arg == '\0') |
71276795 | 639 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
089fbbd2 | 640 | value = cipher_number(arg); |
5260325f | 641 | if (value == -1) |
642 | fatal("%.200s line %d: Bad cipher '%s'.", | |
184eed6a | 643 | filename, linenum, arg ? arg : "<NONE>"); |
5260325f | 644 | if (*activep && *intptr == -1) |
645 | *intptr = value; | |
646 | break; | |
647 | ||
a8be9f80 | 648 | case oCiphers: |
704b1659 | 649 | arg = strdelim(&s); |
089fbbd2 | 650 | if (!arg || *arg == '\0') |
71276795 | 651 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
089fbbd2 | 652 | if (!ciphers_valid(arg)) |
d0c832f3 | 653 | fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.", |
184eed6a | 654 | filename, linenum, arg ? arg : "<NONE>"); |
a8be9f80 | 655 | if (*activep && options->ciphers == NULL) |
089fbbd2 | 656 | options->ciphers = xstrdup(arg); |
a8be9f80 | 657 | break; |
658 | ||
b2552997 | 659 | case oMacs: |
660 | arg = strdelim(&s); | |
661 | if (!arg || *arg == '\0') | |
662 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
663 | if (!mac_valid(arg)) | |
664 | fatal("%.200s line %d: Bad SSH2 Mac spec '%s'.", | |
184eed6a | 665 | filename, linenum, arg ? arg : "<NONE>"); |
b2552997 | 666 | if (*activep && options->macs == NULL) |
667 | options->macs = xstrdup(arg); | |
668 | break; | |
669 | ||
e961a8f9 | 670 | case oHostKeyAlgorithms: |
671 | arg = strdelim(&s); | |
672 | if (!arg || *arg == '\0') | |
673 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
674 | if (!key_names_valid2(arg)) | |
675 | fatal("%.200s line %d: Bad protocol 2 host key algorithms '%s'.", | |
184eed6a | 676 | filename, linenum, arg ? arg : "<NONE>"); |
e961a8f9 | 677 | if (*activep && options->hostkeyalgorithms == NULL) |
678 | options->hostkeyalgorithms = xstrdup(arg); | |
679 | break; | |
680 | ||
a8be9f80 | 681 | case oProtocol: |
682 | intptr = &options->protocol; | |
704b1659 | 683 | arg = strdelim(&s); |
089fbbd2 | 684 | if (!arg || *arg == '\0') |
71276795 | 685 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
089fbbd2 | 686 | value = proto_spec(arg); |
a8be9f80 | 687 | if (value == SSH_PROTO_UNKNOWN) |
688 | fatal("%.200s line %d: Bad protocol spec '%s'.", | |
184eed6a | 689 | filename, linenum, arg ? arg : "<NONE>"); |
a8be9f80 | 690 | if (*activep && *intptr == SSH_PROTO_UNKNOWN) |
691 | *intptr = value; | |
692 | break; | |
693 | ||
5260325f | 694 | case oLogLevel: |
695 | intptr = (int *) &options->log_level; | |
704b1659 | 696 | arg = strdelim(&s); |
089fbbd2 | 697 | value = log_level_number(arg); |
5eaf8578 | 698 | if (value == SYSLOG_LEVEL_NOT_SET) |
54b974dc | 699 | fatal("%.200s line %d: unsupported log level '%s'", |
184eed6a | 700 | filename, linenum, arg ? arg : "<NONE>"); |
5eaf8578 | 701 | if (*activep && (LogLevel) *intptr == SYSLOG_LEVEL_NOT_SET) |
5260325f | 702 | *intptr = (LogLevel) value; |
703 | break; | |
704 | ||
5260325f | 705 | case oLocalForward: |
3a8aabf0 | 706 | case oRemoteForward: |
704b1659 | 707 | arg = strdelim(&s); |
3867aa0a | 708 | if (arg == NULL || *arg == '\0') |
3a8aabf0 | 709 | fatal("%.200s line %d: Missing port argument.", |
710 | filename, linenum); | |
3867aa0a | 711 | arg2 = strdelim(&s); |
712 | if (arg2 == NULL || *arg2 == '\0') | |
713 | fatal("%.200s line %d: Missing target argument.", | |
3a8aabf0 | 714 | filename, linenum); |
3867aa0a | 715 | |
716 | /* construct a string for parse_forward */ | |
717 | snprintf(fwdarg, sizeof(fwdarg), "%s:%s", arg, arg2); | |
718 | ||
719 | if (parse_forward(&fwd, fwdarg) == 0) | |
3a8aabf0 | 720 | fatal("%.200s line %d: Bad forwarding specification.", |
721 | filename, linenum); | |
3867aa0a | 722 | |
3a8aabf0 | 723 | if (*activep) { |
724 | if (opcode == oLocalForward) | |
3867aa0a | 725 | add_local_forward(options, &fwd); |
3a8aabf0 | 726 | else if (opcode == oRemoteForward) |
3867aa0a | 727 | add_remote_forward(options, &fwd); |
3a8aabf0 | 728 | } |
5260325f | 729 | break; |
730 | ||
0490e609 | 731 | case oDynamicForward: |
732 | arg = strdelim(&s); | |
733 | if (!arg || *arg == '\0') | |
734 | fatal("%.200s line %d: Missing port argument.", | |
735 | filename, linenum); | |
3867aa0a | 736 | memset(&fwd, '\0', sizeof(fwd)); |
737 | fwd.connect_host = "socks"; | |
738 | fwd.listen_host = hpdelim(&arg); | |
739 | if (fwd.listen_host == NULL || | |
740 | strlen(fwd.listen_host) >= NI_MAXHOST) | |
741 | fatal("%.200s line %d: Bad forwarding specification.", | |
742 | filename, linenum); | |
743 | if (arg) { | |
744 | fwd.listen_port = a2port(arg); | |
745 | fwd.listen_host = cleanhostname(fwd.listen_host); | |
746 | } else { | |
747 | fwd.listen_port = a2port(fwd.listen_host); | |
4c38e9c6 | 748 | fwd.listen_host = NULL; |
3867aa0a | 749 | } |
750 | if (fwd.listen_port == 0) | |
0490e609 | 751 | fatal("%.200s line %d: Badly formatted port number.", |
752 | filename, linenum); | |
14e4a15f | 753 | if (*activep) |
3867aa0a | 754 | add_local_forward(options, &fwd); |
8002af61 | 755 | break; |
0490e609 | 756 | |
e1c5bfaf | 757 | case oClearAllForwardings: |
758 | intptr = &options->clear_forwardings; | |
759 | goto parse_flag; | |
760 | ||
5260325f | 761 | case oHost: |
762 | *activep = 0; | |
704b1659 | 763 | while ((arg = strdelim(&s)) != NULL && *arg != '\0') |
089fbbd2 | 764 | if (match_pattern(host, arg)) { |
765 | debug("Applying options for %.100s", arg); | |
5260325f | 766 | *activep = 1; |
767 | break; | |
768 | } | |
704b1659 | 769 | /* Avoid garbage check below, as strdelim is done. */ |
5260325f | 770 | return 0; |
771 | ||
772 | case oEscapeChar: | |
773 | intptr = &options->escape_char; | |
704b1659 | 774 | arg = strdelim(&s); |
089fbbd2 | 775 | if (!arg || *arg == '\0') |
5260325f | 776 | fatal("%.200s line %d: Missing argument.", filename, linenum); |
089fbbd2 | 777 | if (arg[0] == '^' && arg[2] == 0 && |
1e3b8b07 | 778 | (u_char) arg[1] >= 64 && (u_char) arg[1] < 128) |
779 | value = (u_char) arg[1] & 31; | |
089fbbd2 | 780 | else if (strlen(arg) == 1) |
1e3b8b07 | 781 | value = (u_char) arg[0]; |
089fbbd2 | 782 | else if (strcmp(arg, "none") == 0) |
4bf9c10e | 783 | value = SSH_ESCAPECHAR_NONE; |
5260325f | 784 | else { |
785 | fatal("%.200s line %d: Bad escape character.", | |
184eed6a | 786 | filename, linenum); |
5260325f | 787 | /* NOTREACHED */ |
788 | value = 0; /* Avoid compiler warning. */ | |
789 | } | |
790 | if (*activep && *intptr == -1) | |
791 | *intptr = value; | |
792 | break; | |
793 | ||
f811e52a | 794 | case oAddressFamily: |
795 | arg = strdelim(&s); | |
38634ff6 | 796 | if (!arg || *arg == '\0') |
797 | fatal("%s line %d: missing address family.", | |
798 | filename, linenum); | |
1572b90f | 799 | intptr = &options->address_family; |
f811e52a | 800 | if (strcasecmp(arg, "inet") == 0) |
1572b90f | 801 | value = AF_INET; |
f811e52a | 802 | else if (strcasecmp(arg, "inet6") == 0) |
1572b90f | 803 | value = AF_INET6; |
f811e52a | 804 | else if (strcasecmp(arg, "any") == 0) |
1572b90f | 805 | value = AF_UNSPEC; |
f811e52a | 806 | else |
807 | fatal("Unsupported AddressFamily \"%s\"", arg); | |
1572b90f | 808 | if (*activep && *intptr == -1) |
809 | *intptr = value; | |
f811e52a | 810 | break; |
811 | ||
cc46e2ee | 812 | case oEnableSSHKeysign: |
813 | intptr = &options->enable_ssh_keysign; | |
814 | goto parse_flag; | |
815 | ||
3a065ed0 | 816 | case oIdentitiesOnly: |
817 | intptr = &options->identities_only; | |
818 | goto parse_flag; | |
819 | ||
5d8d32a3 | 820 | case oServerAliveInterval: |
821 | intptr = &options->server_alive_interval; | |
822 | goto parse_time; | |
823 | ||
824 | case oServerAliveCountMax: | |
825 | intptr = &options->server_alive_count_max; | |
826 | goto parse_int; | |
827 | ||
61a2c1da | 828 | case oSendEnv: |
829 | while ((arg = strdelim(&s)) != NULL && *arg != '\0') { | |
830 | if (strchr(arg, '=') != NULL) | |
831 | fatal("%s line %d: Invalid environment name.", | |
832 | filename, linenum); | |
c8c99dd5 | 833 | if (!*activep) |
834 | continue; | |
61a2c1da | 835 | if (options->num_send_env >= MAX_SEND_ENV) |
836 | fatal("%s line %d: too many send env.", | |
837 | filename, linenum); | |
838 | options->send_env[options->num_send_env++] = | |
839 | xstrdup(arg); | |
840 | } | |
841 | break; | |
842 | ||
5e96b616 | 843 | case oControlPath: |
844 | charptr = &options->control_path; | |
845 | goto parse_string; | |
846 | ||
847 | case oControlMaster: | |
848 | intptr = &options->control_master; | |
9dfd96d6 | 849 | arg = strdelim(&s); |
850 | if (!arg || *arg == '\0') | |
851 | fatal("%.200s line %d: Missing ControlMaster argument.", | |
852 | filename, linenum); | |
853 | value = 0; /* To avoid compiler warning... */ | |
854 | if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0) | |
855 | value = SSHCTL_MASTER_YES; | |
856 | else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0) | |
857 | value = SSHCTL_MASTER_NO; | |
858 | else if (strcmp(arg, "auto") == 0) | |
859 | value = SSHCTL_MASTER_AUTO; | |
860 | else if (strcmp(arg, "ask") == 0) | |
861 | value = SSHCTL_MASTER_ASK; | |
862 | else if (strcmp(arg, "autoask") == 0) | |
863 | value = SSHCTL_MASTER_AUTO_ASK; | |
864 | else | |
865 | fatal("%.200s line %d: Bad ControlMaster argument.", | |
866 | filename, linenum); | |
867 | if (*activep && *intptr == -1) | |
868 | *intptr = value; | |
869 | break; | |
5e96b616 | 870 | |
5c63c2ab | 871 | case oHashKnownHosts: |
872 | intptr = &options->hash_known_hosts; | |
873 | goto parse_flag; | |
874 | ||
d20f3c9e | 875 | case oTunnel: |
876 | intptr = &options->tun_open; | |
a4f24bf8 | 877 | arg = strdelim(&s); |
878 | if (!arg || *arg == '\0') | |
879 | fatal("%s line %d: Missing yes/point-to-point/" | |
880 | "ethernet/no argument.", filename, linenum); | |
881 | value = 0; /* silence compiler */ | |
882 | if (strcasecmp(arg, "ethernet") == 0) | |
883 | value = SSH_TUNMODE_ETHERNET; | |
884 | else if (strcasecmp(arg, "point-to-point") == 0) | |
885 | value = SSH_TUNMODE_POINTOPOINT; | |
886 | else if (strcasecmp(arg, "yes") == 0) | |
887 | value = SSH_TUNMODE_DEFAULT; | |
888 | else if (strcasecmp(arg, "no") == 0) | |
889 | value = SSH_TUNMODE_NO; | |
890 | else | |
891 | fatal("%s line %d: Bad yes/point-to-point/ethernet/" | |
892 | "no argument: %s", filename, linenum, arg); | |
893 | if (*activep) | |
894 | *intptr = value; | |
895 | break; | |
d20f3c9e | 896 | |
897 | case oTunnelDevice: | |
898 | arg = strdelim(&s); | |
899 | if (!arg || *arg == '\0') | |
900 | fatal("%.200s line %d: Missing argument.", filename, linenum); | |
901 | value = a2tun(arg, &value2); | |
a4f24bf8 | 902 | if (value == SSH_TUNID_ERR) |
d20f3c9e | 903 | fatal("%.200s line %d: Bad tun device.", filename, linenum); |
904 | if (*activep) { | |
905 | options->tun_local = value; | |
906 | options->tun_remote = value2; | |
907 | } | |
908 | break; | |
909 | ||
910 | case oLocalCommand: | |
911 | charptr = &options->local_command; | |
912 | goto parse_command; | |
913 | ||
914 | case oPermitLocalCommand: | |
915 | intptr = &options->permit_local_command; | |
916 | goto parse_flag; | |
917 | ||
80fcb74e | 918 | case oDeprecated: |
4feae93d | 919 | debug("%s line %d: Deprecated option \"%s\"", |
80fcb74e | 920 | filename, linenum, keyword); |
4feae93d | 921 | return 0; |
80fcb74e | 922 | |
a2144546 | 923 | case oUnsupported: |
924 | error("%s line %d: Unsupported option \"%s\"", | |
925 | filename, linenum, keyword); | |
926 | return 0; | |
927 | ||
5260325f | 928 | default: |
929 | fatal("process_config_line: Unimplemented opcode %d", opcode); | |
930 | } | |
931 | ||
932 | /* Check that there is no garbage at end of line. */ | |
42f11eb2 | 933 | if ((arg = strdelim(&s)) != NULL && *arg != '\0') { |
089fbbd2 | 934 | fatal("%.200s line %d: garbage at end of line; \"%.200s\".", |
4e2e5cfd | 935 | filename, linenum, arg); |
089fbbd2 | 936 | } |
5260325f | 937 | return 0; |
8efc0c15 | 938 | } |
939 | ||
940 | ||
aa3378df | 941 | /* |
942 | * Reads the config file and modifies the options accordingly. Options | |
943 | * should already be initialized before this call. This never returns if | |
93111dfa | 944 | * there is an error. If the file does not exist, this returns 0. |
aa3378df | 945 | */ |
8efc0c15 | 946 | |
93111dfa | 947 | int |
f2107e97 | 948 | read_config_file(const char *filename, const char *host, Options *options, |
9f6cab4b | 949 | int checkperm) |
8efc0c15 | 950 | { |
5260325f | 951 | FILE *f; |
952 | char line[1024]; | |
953 | int active, linenum; | |
954 | int bad_options = 0; | |
955 | ||
956 | /* Open the file. */ | |
9f6cab4b | 957 | if ((f = fopen(filename, "r")) == NULL) |
93111dfa | 958 | return 0; |
5260325f | 959 | |
9f6cab4b | 960 | if (checkperm) { |
961 | struct stat sb; | |
f2107e97 | 962 | |
f9ee425b | 963 | if (fstat(fileno(f), &sb) == -1) |
9f6cab4b | 964 | fatal("fstat %s: %s", filename, strerror(errno)); |
9f6cab4b | 965 | if (((sb.st_uid != 0 && sb.st_uid != getuid()) || |
f9ee425b | 966 | (sb.st_mode & 022) != 0)) |
9f6cab4b | 967 | fatal("Bad owner or permissions on %s", filename); |
9f6cab4b | 968 | } |
969 | ||
5260325f | 970 | debug("Reading configuration data %.200s", filename); |
971 | ||
aa3378df | 972 | /* |
973 | * Mark that we are now processing the options. This flag is turned | |
974 | * on/off by Host specifications. | |
975 | */ | |
5260325f | 976 | active = 1; |
977 | linenum = 0; | |
978 | while (fgets(line, sizeof(line), f)) { | |
979 | /* Update line number counter. */ | |
980 | linenum++; | |
981 | if (process_config_line(options, host, line, filename, linenum, &active) != 0) | |
982 | bad_options++; | |
983 | } | |
984 | fclose(f); | |
985 | if (bad_options > 0) | |
54b974dc | 986 | fatal("%s: terminating, %d bad configuration options", |
184eed6a | 987 | filename, bad_options); |
93111dfa | 988 | return 1; |
8efc0c15 | 989 | } |
990 | ||
aa3378df | 991 | /* |
992 | * Initializes options to special values that indicate that they have not yet | |
993 | * been set. Read_config_file will only set options with this value. Options | |
994 | * are processed in the following order: command line, user config file, | |
995 | * system config file. Last, fill_default_options is called. | |
996 | */ | |
8efc0c15 | 997 | |
6ae2364d | 998 | void |
5260325f | 999 | initialize_options(Options * options) |
8efc0c15 | 1000 | { |
5260325f | 1001 | memset(options, 'X', sizeof(*options)); |
1002 | options->forward_agent = -1; | |
1003 | options->forward_x11 = -1; | |
d73a67d7 | 1004 | options->forward_x11_trusted = -1; |
42ea6f5e | 1005 | options->exit_on_forward_failure = -1; |
fa649821 | 1006 | options->xauth_location = NULL; |
5260325f | 1007 | options->gateway_ports = -1; |
1008 | options->use_privileged_port = -1; | |
5260325f | 1009 | options->rsa_authentication = -1; |
fa08c86b | 1010 | options->pubkey_authentication = -1; |
5ba55ada | 1011 | options->challenge_response_authentication = -1; |
7364bd04 | 1012 | options->gss_authentication = -1; |
1013 | options->gss_deleg_creds = -1; | |
5260325f | 1014 | options->password_authentication = -1; |
94ec8c6b | 1015 | options->kbd_interactive_authentication = -1; |
1016 | options->kbd_interactive_devices = NULL; | |
5260325f | 1017 | options->rhosts_rsa_authentication = -1; |
8002af61 | 1018 | options->hostbased_authentication = -1; |
5260325f | 1019 | options->batch_mode = -1; |
1020 | options->check_host_ip = -1; | |
1021 | options->strict_host_key_checking = -1; | |
1022 | options->compression = -1; | |
fd573618 | 1023 | options->tcp_keep_alive = -1; |
5260325f | 1024 | options->compression_level = -1; |
1025 | options->port = -1; | |
1572b90f | 1026 | options->address_family = -1; |
5260325f | 1027 | options->connection_attempts = -1; |
09ab3296 | 1028 | options->connection_timeout = -1; |
5260325f | 1029 | options->number_of_password_prompts = -1; |
1030 | options->cipher = -1; | |
a8be9f80 | 1031 | options->ciphers = NULL; |
b2552997 | 1032 | options->macs = NULL; |
e961a8f9 | 1033 | options->hostkeyalgorithms = NULL; |
a8be9f80 | 1034 | options->protocol = SSH_PROTO_UNKNOWN; |
5260325f | 1035 | options->num_identity_files = 0; |
1036 | options->hostname = NULL; | |
8abcdba4 | 1037 | options->host_key_alias = NULL; |
5260325f | 1038 | options->proxy_command = NULL; |
1039 | options->user = NULL; | |
1040 | options->escape_char = -1; | |
1041 | options->system_hostfile = NULL; | |
1042 | options->user_hostfile = NULL; | |
a306f2dd | 1043 | options->system_hostfile2 = NULL; |
1044 | options->user_hostfile2 = NULL; | |
5260325f | 1045 | options->num_local_forwards = 0; |
1046 | options->num_remote_forwards = 0; | |
e1c5bfaf | 1047 | options->clear_forwardings = -1; |
5eaf8578 | 1048 | options->log_level = SYSLOG_LEVEL_NOT_SET; |
cab80f75 | 1049 | options->preferred_authentications = NULL; |
3435f5a6 | 1050 | options->bind_address = NULL; |
9ff6f66f | 1051 | options->smartcard_device = NULL; |
cc46e2ee | 1052 | options->enable_ssh_keysign = - 1; |
8bbc048a | 1053 | options->no_host_authentication_for_localhost = - 1; |
3a065ed0 | 1054 | options->identities_only = - 1; |
ffd7b36b | 1055 | options->rekey_limit = - 1; |
21289cd0 | 1056 | options->verify_host_key_dns = -1; |
5d8d32a3 | 1057 | options->server_alive_interval = -1; |
1058 | options->server_alive_count_max = -1; | |
61a2c1da | 1059 | options->num_send_env = 0; |
5e96b616 | 1060 | options->control_path = NULL; |
1061 | options->control_master = -1; | |
5c63c2ab | 1062 | options->hash_known_hosts = -1; |
d20f3c9e | 1063 | options->tun_open = -1; |
1064 | options->tun_local = -1; | |
1065 | options->tun_remote = -1; | |
1066 | options->local_command = NULL; | |
1067 | options->permit_local_command = -1; | |
8efc0c15 | 1068 | } |
1069 | ||
aa3378df | 1070 | /* |
1071 | * Called after processing other sources of option data, this fills those | |
1072 | * options for which no value has been specified with their default values. | |
1073 | */ | |
8efc0c15 | 1074 | |
6ae2364d | 1075 | void |
5260325f | 1076 | fill_default_options(Options * options) |
8efc0c15 | 1077 | { |
d2c46e77 | 1078 | int len; |
1079 | ||
5260325f | 1080 | if (options->forward_agent == -1) |
71276795 | 1081 | options->forward_agent = 0; |
5260325f | 1082 | if (options->forward_x11 == -1) |
c8d54615 | 1083 | options->forward_x11 = 0; |
d73a67d7 | 1084 | if (options->forward_x11_trusted == -1) |
1085 | options->forward_x11_trusted = 0; | |
42ea6f5e | 1086 | if (options->exit_on_forward_failure == -1) |
1087 | options->exit_on_forward_failure = 0; | |
fa649821 | 1088 | if (options->xauth_location == NULL) |
fd9ede94 | 1089 | options->xauth_location = _PATH_XAUTH; |
5260325f | 1090 | if (options->gateway_ports == -1) |
1091 | options->gateway_ports = 0; | |
1092 | if (options->use_privileged_port == -1) | |
d5ebca2b | 1093 | options->use_privileged_port = 0; |
5260325f | 1094 | if (options->rsa_authentication == -1) |
1095 | options->rsa_authentication = 1; | |
fa08c86b | 1096 | if (options->pubkey_authentication == -1) |
1097 | options->pubkey_authentication = 1; | |
5ba55ada | 1098 | if (options->challenge_response_authentication == -1) |
10a2cbef | 1099 | options->challenge_response_authentication = 1; |
7364bd04 | 1100 | if (options->gss_authentication == -1) |
2ecb78df | 1101 | options->gss_authentication = 0; |
7364bd04 | 1102 | if (options->gss_deleg_creds == -1) |
1103 | options->gss_deleg_creds = 0; | |
5260325f | 1104 | if (options->password_authentication == -1) |
1105 | options->password_authentication = 1; | |
94ec8c6b | 1106 | if (options->kbd_interactive_authentication == -1) |
d464095c | 1107 | options->kbd_interactive_authentication = 1; |
5260325f | 1108 | if (options->rhosts_rsa_authentication == -1) |
4b3d23b4 | 1109 | options->rhosts_rsa_authentication = 0; |
8002af61 | 1110 | if (options->hostbased_authentication == -1) |
1111 | options->hostbased_authentication = 0; | |
5260325f | 1112 | if (options->batch_mode == -1) |
1113 | options->batch_mode = 0; | |
1114 | if (options->check_host_ip == -1) | |
1115 | options->check_host_ip = 1; | |
1116 | if (options->strict_host_key_checking == -1) | |
1117 | options->strict_host_key_checking = 2; /* 2 is default */ | |
1118 | if (options->compression == -1) | |
1119 | options->compression = 0; | |
fd573618 | 1120 | if (options->tcp_keep_alive == -1) |
1121 | options->tcp_keep_alive = 1; | |
5260325f | 1122 | if (options->compression_level == -1) |
1123 | options->compression_level = 6; | |
1124 | if (options->port == -1) | |
1125 | options->port = 0; /* Filled in ssh_connect. */ | |
1572b90f | 1126 | if (options->address_family == -1) |
1127 | options->address_family = AF_UNSPEC; | |
5260325f | 1128 | if (options->connection_attempts == -1) |
ce773142 | 1129 | options->connection_attempts = 1; |
5260325f | 1130 | if (options->number_of_password_prompts == -1) |
1131 | options->number_of_password_prompts = 3; | |
1132 | /* Selected in ssh_login(). */ | |
1133 | if (options->cipher == -1) | |
1134 | options->cipher = SSH_CIPHER_NOT_SET; | |
d0c832f3 | 1135 | /* options->ciphers, default set in myproposals.h */ |
b2552997 | 1136 | /* options->macs, default set in myproposals.h */ |
e961a8f9 | 1137 | /* options->hostkeyalgorithms, default set in myproposals.h */ |
a8be9f80 | 1138 | if (options->protocol == SSH_PROTO_UNKNOWN) |
3e587cc3 | 1139 | options->protocol = SSH_PROTO_1|SSH_PROTO_2; |
5260325f | 1140 | if (options->num_identity_files == 0) { |
fa08c86b | 1141 | if (options->protocol & SSH_PROTO_1) { |
d2c46e77 | 1142 | len = 2 + strlen(_PATH_SSH_CLIENT_IDENTITY) + 1; |
fa08c86b | 1143 | options->identity_files[options->num_identity_files] = |
d2c46e77 | 1144 | xmalloc(len); |
1145 | snprintf(options->identity_files[options->num_identity_files++], | |
1146 | len, "~/%.100s", _PATH_SSH_CLIENT_IDENTITY); | |
fa08c86b | 1147 | } |
1148 | if (options->protocol & SSH_PROTO_2) { | |
ec63b02d | 1149 | len = 2 + strlen(_PATH_SSH_CLIENT_ID_RSA) + 1; |
1150 | options->identity_files[options->num_identity_files] = | |
1151 | xmalloc(len); | |
1152 | snprintf(options->identity_files[options->num_identity_files++], | |
1153 | len, "~/%.100s", _PATH_SSH_CLIENT_ID_RSA); | |
1154 | ||
d2c46e77 | 1155 | len = 2 + strlen(_PATH_SSH_CLIENT_ID_DSA) + 1; |
fa08c86b | 1156 | options->identity_files[options->num_identity_files] = |
d2c46e77 | 1157 | xmalloc(len); |
1158 | snprintf(options->identity_files[options->num_identity_files++], | |
1159 | len, "~/%.100s", _PATH_SSH_CLIENT_ID_DSA); | |
fa08c86b | 1160 | } |
a306f2dd | 1161 | } |
5260325f | 1162 | if (options->escape_char == -1) |
1163 | options->escape_char = '~'; | |
1164 | if (options->system_hostfile == NULL) | |
42f11eb2 | 1165 | options->system_hostfile = _PATH_SSH_SYSTEM_HOSTFILE; |
5260325f | 1166 | if (options->user_hostfile == NULL) |
42f11eb2 | 1167 | options->user_hostfile = _PATH_SSH_USER_HOSTFILE; |
a306f2dd | 1168 | if (options->system_hostfile2 == NULL) |
42f11eb2 | 1169 | options->system_hostfile2 = _PATH_SSH_SYSTEM_HOSTFILE2; |
a306f2dd | 1170 | if (options->user_hostfile2 == NULL) |
42f11eb2 | 1171 | options->user_hostfile2 = _PATH_SSH_USER_HOSTFILE2; |
5eaf8578 | 1172 | if (options->log_level == SYSLOG_LEVEL_NOT_SET) |
59c97189 | 1173 | options->log_level = SYSLOG_LEVEL_INFO; |
e1c5bfaf | 1174 | if (options->clear_forwardings == 1) |
1175 | clear_forwardings(options); | |
8bbc048a | 1176 | if (options->no_host_authentication_for_localhost == - 1) |
1177 | options->no_host_authentication_for_localhost = 0; | |
3a065ed0 | 1178 | if (options->identities_only == -1) |
1179 | options->identities_only = 0; | |
cc46e2ee | 1180 | if (options->enable_ssh_keysign == -1) |
1181 | options->enable_ssh_keysign = 0; | |
ffd7b36b | 1182 | if (options->rekey_limit == -1) |
1183 | options->rekey_limit = 0; | |
21289cd0 | 1184 | if (options->verify_host_key_dns == -1) |
1185 | options->verify_host_key_dns = 0; | |
5d8d32a3 | 1186 | if (options->server_alive_interval == -1) |
1187 | options->server_alive_interval = 0; | |
1188 | if (options->server_alive_count_max == -1) | |
1189 | options->server_alive_count_max = 3; | |
5e96b616 | 1190 | if (options->control_master == -1) |
1191 | options->control_master = 0; | |
5c63c2ab | 1192 | if (options->hash_known_hosts == -1) |
1193 | options->hash_known_hosts = 0; | |
d20f3c9e | 1194 | if (options->tun_open == -1) |
a4f24bf8 | 1195 | options->tun_open = SSH_TUNMODE_NO; |
1196 | if (options->tun_local == -1) | |
1197 | options->tun_local = SSH_TUNID_ANY; | |
1198 | if (options->tun_remote == -1) | |
1199 | options->tun_remote = SSH_TUNID_ANY; | |
d20f3c9e | 1200 | if (options->permit_local_command == -1) |
1201 | options->permit_local_command = 0; | |
1202 | /* options->local_command should not be set by default */ | |
5260325f | 1203 | /* options->proxy_command should not be set by default */ |
1204 | /* options->user will be set in the main program if appropriate */ | |
1205 | /* options->hostname will be set in the main program if appropriate */ | |
8abcdba4 | 1206 | /* options->host_key_alias should not be set by default */ |
cab80f75 | 1207 | /* options->preferred_authentications will be set in ssh */ |
8efc0c15 | 1208 | } |
3867aa0a | 1209 | |
1210 | /* | |
1211 | * parse_forward | |
1212 | * parses a string containing a port forwarding specification of the form: | |
1213 | * [listenhost:]listenport:connecthost:connectport | |
1214 | * returns number of arguments parsed or zero on error | |
1215 | */ | |
1216 | int | |
1217 | parse_forward(Forward *fwd, const char *fwdspec) | |
1218 | { | |
1219 | int i; | |
1220 | char *p, *cp, *fwdarg[4]; | |
1221 | ||
1222 | memset(fwd, '\0', sizeof(*fwd)); | |
1223 | ||
1224 | cp = p = xstrdup(fwdspec); | |
1225 | ||
1226 | /* skip leading spaces */ | |
f48fbab3 | 1227 | while (isspace(*cp)) |
3867aa0a | 1228 | cp++; |
1229 | ||
1230 | for (i = 0; i < 4; ++i) | |
1231 | if ((fwdarg[i] = hpdelim(&cp)) == NULL) | |
1232 | break; | |
1233 | ||
1234 | /* Check for trailing garbage in 4-arg case*/ | |
1235 | if (cp != NULL) | |
1236 | i = 0; /* failure */ | |
1237 | ||
1238 | switch (i) { | |
1239 | case 3: | |
1240 | fwd->listen_host = NULL; | |
1241 | fwd->listen_port = a2port(fwdarg[0]); | |
1242 | fwd->connect_host = xstrdup(cleanhostname(fwdarg[1])); | |
1243 | fwd->connect_port = a2port(fwdarg[2]); | |
1244 | break; | |
1245 | ||
1246 | case 4: | |
1247 | fwd->listen_host = xstrdup(cleanhostname(fwdarg[0])); | |
1248 | fwd->listen_port = a2port(fwdarg[1]); | |
1249 | fwd->connect_host = xstrdup(cleanhostname(fwdarg[2])); | |
1250 | fwd->connect_port = a2port(fwdarg[3]); | |
1251 | break; | |
1252 | default: | |
1253 | i = 0; /* failure */ | |
1254 | } | |
1255 | ||
1256 | xfree(p); | |
1257 | ||
c462cd6f | 1258 | if (fwd->listen_port == 0 || fwd->connect_port == 0) |
3867aa0a | 1259 | goto fail_free; |
1260 | ||
1261 | if (fwd->connect_host != NULL && | |
1262 | strlen(fwd->connect_host) >= NI_MAXHOST) | |
1263 | goto fail_free; | |
1264 | ||
1265 | return (i); | |
1266 | ||
1267 | fail_free: | |
1268 | if (fwd->connect_host != NULL) | |
1269 | xfree(fwd->connect_host); | |
1270 | if (fwd->listen_host != NULL) | |
1271 | xfree(fwd->listen_host); | |
1272 | return (0); | |
1273 | } |