Annotation of src/usr.bin/ssh/readconf.c, Revision 1.81
1.1 deraadt 1: /*
1.18 deraadt 2: * Author: Tatu Ylonen <ylo@cs.hut.fi>
3: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4: * All rights reserved
5: * Functions for reading the configuration files.
1.26 markus 6: *
1.46 deraadt 7: * As far as I am concerned, the code I have written for this software
8: * can be used freely for any purpose. Any derived versions of this
9: * software must be clearly marked as such, and if the derived work is
10: * incompatible with the protocol description in the RFC file, it must be
11: * called by a name other than "ssh" or "Secure Shell".
1.18 deraadt 12: */
1.1 deraadt 13:
14: #include "includes.h"
1.81 ! markus 15: RCSID("$OpenBSD: readconf.c,v 1.80 2001/06/08 15:25:40 markus Exp $");
1.1 deraadt 16:
17: #include "ssh.h"
18: #include "xmalloc.h"
1.25 markus 19: #include "compat.h"
1.58 markus 20: #include "cipher.h"
1.55 markus 21: #include "pathnames.h"
1.58 markus 22: #include "log.h"
23: #include "readconf.h"
24: #include "match.h"
25: #include "misc.h"
1.62 markus 26: #include "kex.h"
27: #include "mac.h"
1.1 deraadt 28:
29: /* Format of the configuration file:
30:
31: # Configuration data is parsed as follows:
32: # 1. command line options
33: # 2. user-specific file
34: # 3. system-wide file
35: # Any configuration value is only changed the first time it is set.
36: # Thus, host-specific definitions should be at the beginning of the
37: # configuration file, and defaults at the end.
38:
39: # Host-specific declarations. These may override anything above. A single
40: # host may match multiple declarations; these are processed in the order
41: # that they are given in.
42:
43: Host *.ngs.fi ngs.fi
44: FallBackToRsh no
45:
46: Host fake.com
47: HostName another.host.name.real.org
48: User blaah
49: Port 34289
50: ForwardX11 no
51: ForwardAgent no
52:
53: Host books.com
54: RemoteForward 9999 shadows.cs.hut.fi:9999
55: Cipher 3des
56:
57: Host fascist.blob.com
58: Port 23123
59: User tylonen
60: RhostsAuthentication no
61: PasswordAuthentication no
62:
63: Host puukko.hut.fi
64: User t35124p
65: ProxyCommand ssh-proxy %h %p
66:
67: Host *.fr
68: UseRsh yes
69:
70: Host *.su
71: Cipher none
72: PasswordAuthentication no
73:
74: # Defaults for various options
75: Host *
76: ForwardAgent no
1.50 markus 77: ForwardX11 no
1.1 deraadt 78: RhostsAuthentication yes
79: PasswordAuthentication yes
80: RSAAuthentication yes
81: RhostsRSAAuthentication yes
82: FallBackToRsh no
83: UseRsh no
84: StrictHostKeyChecking yes
85: KeepAlives no
86: IdentityFile ~/.ssh/identity
87: Port 22
88: EscapeChar ~
89:
90: */
91:
92: /* Keyword tokens. */
93:
1.17 markus 94: typedef enum {
95: oBadOption,
96: oForwardAgent, oForwardX11, oGatewayPorts, oRhostsAuthentication,
97: oPasswordAuthentication, oRSAAuthentication, oFallBackToRsh, oUseRsh,
1.59 markus 98: oChallengeResponseAuthentication, oXAuthLocation,
1.1 deraadt 99: #ifdef KRB4
1.17 markus 100: oKerberosAuthentication,
1.1 deraadt 101: #endif /* KRB4 */
102: #ifdef AFS
1.17 markus 103: oKerberosTgtPassing, oAFSTokenPassing,
1.1 deraadt 104: #endif
1.17 markus 105: oIdentityFile, oHostName, oPort, oCipher, oRemoteForward, oLocalForward,
106: oUser, oHost, oEscapeChar, oRhostsRSAAuthentication, oProxyCommand,
107: oGlobalKnownHostsFile, oUserKnownHostsFile, oConnectionAttempts,
108: oBatchMode, oCheckHostIP, oStrictHostKeyChecking, oCompression,
1.59 markus 109: oCompressionLevel, oKeepAlives, oNumberOfPasswordPrompts,
1.62 markus 110: oUsePrivilegedPort, oLogLevel, oCiphers, oProtocol, oMacs,
1.50 markus 111: oGlobalKnownHostsFile2, oUserKnownHostsFile2, oPubkeyAuthentication,
1.67 markus 112: oKbdInteractiveAuthentication, oKbdInteractiveDevices, oHostKeyAlias,
1.76 markus 113: oDynamicForward, oPreferredAuthentications, oHostbasedAuthentication,
1.77 markus 114: oHostKeyAlgorithms, oBindAddress
1.1 deraadt 115: } OpCodes;
116:
117: /* Textual representations of the tokens. */
118:
1.17 markus 119: static struct {
120: const char *name;
121: OpCodes opcode;
122: } keywords[] = {
123: { "forwardagent", oForwardAgent },
124: { "forwardx11", oForwardX11 },
1.34 markus 125: { "xauthlocation", oXAuthLocation },
1.17 markus 126: { "gatewayports", oGatewayPorts },
127: { "useprivilegedport", oUsePrivilegedPort },
128: { "rhostsauthentication", oRhostsAuthentication },
129: { "passwordauthentication", oPasswordAuthentication },
1.48 markus 130: { "kbdinteractiveauthentication", oKbdInteractiveAuthentication },
131: { "kbdinteractivedevices", oKbdInteractiveDevices },
1.17 markus 132: { "rsaauthentication", oRSAAuthentication },
1.50 markus 133: { "pubkeyauthentication", oPubkeyAuthentication },
1.59 markus 134: { "dsaauthentication", oPubkeyAuthentication }, /* alias */
1.72 markus 135: { "rhostsrsaauthentication", oRhostsRSAAuthentication },
1.73 markus 136: { "hostbasedauthentication", oHostbasedAuthentication },
1.59 markus 137: { "challengeresponseauthentication", oChallengeResponseAuthentication },
138: { "skeyauthentication", oChallengeResponseAuthentication }, /* alias */
139: { "tisauthentication", oChallengeResponseAuthentication }, /* alias */
1.1 deraadt 140: #ifdef KRB4
1.17 markus 141: { "kerberosauthentication", oKerberosAuthentication },
1.1 deraadt 142: #endif /* KRB4 */
1.5 dugsong 143: #ifdef AFS
1.17 markus 144: { "kerberostgtpassing", oKerberosTgtPassing },
145: { "afstokenpassing", oAFSTokenPassing },
1.1 deraadt 146: #endif
1.17 markus 147: { "fallbacktorsh", oFallBackToRsh },
148: { "usersh", oUseRsh },
149: { "identityfile", oIdentityFile },
1.50 markus 150: { "identityfile2", oIdentityFile }, /* alias */
1.17 markus 151: { "hostname", oHostName },
1.52 markus 152: { "hostkeyalias", oHostKeyAlias },
1.17 markus 153: { "proxycommand", oProxyCommand },
154: { "port", oPort },
155: { "cipher", oCipher },
1.25 markus 156: { "ciphers", oCiphers },
1.62 markus 157: { "macs", oMacs },
1.25 markus 158: { "protocol", oProtocol },
1.17 markus 159: { "remoteforward", oRemoteForward },
160: { "localforward", oLocalForward },
161: { "user", oUser },
162: { "host", oHost },
163: { "escapechar", oEscapeChar },
164: { "globalknownhostsfile", oGlobalKnownHostsFile },
1.81 ! markus 165: { "userknownhostsfile", oUserKnownHostsFile }, /* obsolete */
1.27 markus 166: { "globalknownhostsfile2", oGlobalKnownHostsFile2 },
1.81 ! markus 167: { "userknownhostsfile2", oUserKnownHostsFile2 }, /* obsolete */
1.17 markus 168: { "connectionattempts", oConnectionAttempts },
169: { "batchmode", oBatchMode },
170: { "checkhostip", oCheckHostIP },
171: { "stricthostkeychecking", oStrictHostKeyChecking },
172: { "compression", oCompression },
173: { "compressionlevel", oCompressionLevel },
174: { "keepalive", oKeepAlives },
175: { "numberofpasswordprompts", oNumberOfPasswordPrompts },
176: { "loglevel", oLogLevel },
1.71 markus 177: { "dynamicforward", oDynamicForward },
1.67 markus 178: { "preferredauthentications", oPreferredAuthentications },
1.76 markus 179: { "hostkeyalgorithms", oHostKeyAlgorithms },
1.77 markus 180: { "bindaddress", oBindAddress },
1.17 markus 181: { NULL, 0 }
1.13 markus 182: };
183:
1.19 markus 184: /*
185: * Adds a local TCP/IP port forward to options. Never returns if there is an
186: * error.
187: */
1.1 deraadt 188:
1.26 markus 189: void
1.22 markus 190: add_local_forward(Options *options, u_short port, const char *host,
191: u_short host_port)
1.1 deraadt 192: {
1.17 markus 193: Forward *fwd;
194: extern uid_t original_real_uid;
195: if (port < IPPORT_RESERVED && original_real_uid != 0)
1.64 millert 196: fatal("Privileged ports can only be forwarded by root.");
1.17 markus 197: if (options->num_local_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
198: fatal("Too many local forwards (max %d).", SSH_MAX_FORWARDS_PER_DIRECTION);
199: fwd = &options->local_forwards[options->num_local_forwards++];
200: fwd->port = port;
201: fwd->host = xstrdup(host);
202: fwd->host_port = host_port;
1.1 deraadt 203: }
204:
1.19 markus 205: /*
206: * Adds a remote TCP/IP port forward to options. Never returns if there is
207: * an error.
208: */
1.1 deraadt 209:
1.26 markus 210: void
1.22 markus 211: add_remote_forward(Options *options, u_short port, const char *host,
212: u_short host_port)
1.1 deraadt 213: {
1.17 markus 214: Forward *fwd;
215: if (options->num_remote_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
216: fatal("Too many remote forwards (max %d).",
217: SSH_MAX_FORWARDS_PER_DIRECTION);
218: fwd = &options->remote_forwards[options->num_remote_forwards++];
219: fwd->port = port;
220: fwd->host = xstrdup(host);
221: fwd->host_port = host_port;
1.1 deraadt 222: }
223:
1.19 markus 224: /*
1.70 stevesk 225: * Returns the number of the token pointed to by cp or oBadOption.
1.19 markus 226: */
1.1 deraadt 227:
1.26 markus 228: static OpCodes
1.17 markus 229: parse_token(const char *cp, const char *filename, int linenum)
1.1 deraadt 230: {
1.51 markus 231: u_int i;
1.1 deraadt 232:
1.17 markus 233: for (i = 0; keywords[i].name; i++)
1.20 markus 234: if (strcasecmp(cp, keywords[i].name) == 0)
1.17 markus 235: return keywords[i].opcode;
236:
1.75 stevesk 237: error("%s: line %d: Bad configuration option: %s",
238: filename, linenum, cp);
1.17 markus 239: return oBadOption;
1.1 deraadt 240: }
241:
1.19 markus 242: /*
243: * Processes a single option line as used in the configuration files. This
244: * only sets those values that have not already been set.
245: */
1.1 deraadt 246:
1.14 markus 247: int
248: process_config_line(Options *options, const char *host,
1.17 markus 249: char *line, const char *filename, int linenum,
250: int *activep)
1.1 deraadt 251: {
1.38 provos 252: char buf[256], *s, *string, **charptr, *endofnumber, *keyword, *arg;
1.22 markus 253: int opcode, *intptr, value;
254: u_short fwd_port, fwd_host_port;
1.1 deraadt 255:
1.42 provos 256: s = line;
257: /* Get the keyword. (Each line is supposed to begin with a keyword). */
258: keyword = strdelim(&s);
259: /* Ignore leading whitespace. */
260: if (*keyword == '\0')
1.43 markus 261: keyword = strdelim(&s);
1.56 deraadt 262: if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#')
1.17 markus 263: return 0;
264:
1.38 provos 265: opcode = parse_token(keyword, filename, linenum);
1.17 markus 266:
267: switch (opcode) {
268: case oBadOption:
1.19 markus 269: /* don't panic, but count bad options */
270: return -1;
1.17 markus 271: /* NOTREACHED */
272: case oForwardAgent:
273: intptr = &options->forward_agent;
274: parse_flag:
1.42 provos 275: arg = strdelim(&s);
1.40 ho 276: if (!arg || *arg == '\0')
1.17 markus 277: fatal("%.200s line %d: Missing yes/no argument.", filename, linenum);
278: value = 0; /* To avoid compiler warning... */
1.38 provos 279: if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
1.17 markus 280: value = 1;
1.38 provos 281: else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
1.17 markus 282: value = 0;
283: else
284: fatal("%.200s line %d: Bad yes/no argument.", filename, linenum);
285: if (*activep && *intptr == -1)
286: *intptr = value;
287: break;
288:
289: case oForwardX11:
290: intptr = &options->forward_x11;
291: goto parse_flag;
292:
293: case oGatewayPorts:
294: intptr = &options->gateway_ports;
295: goto parse_flag;
296:
297: case oUsePrivilegedPort:
298: intptr = &options->use_privileged_port;
299: goto parse_flag;
300:
301: case oRhostsAuthentication:
302: intptr = &options->rhosts_authentication;
303: goto parse_flag;
304:
305: case oPasswordAuthentication:
306: intptr = &options->password_authentication;
307: goto parse_flag;
308:
1.48 markus 309: case oKbdInteractiveAuthentication:
310: intptr = &options->kbd_interactive_authentication;
311: goto parse_flag;
312:
313: case oKbdInteractiveDevices:
314: charptr = &options->kbd_interactive_devices;
315: goto parse_string;
316:
1.50 markus 317: case oPubkeyAuthentication:
318: intptr = &options->pubkey_authentication;
1.30 markus 319: goto parse_flag;
320:
1.17 markus 321: case oRSAAuthentication:
322: intptr = &options->rsa_authentication;
323: goto parse_flag;
324:
325: case oRhostsRSAAuthentication:
326: intptr = &options->rhosts_rsa_authentication;
327: goto parse_flag;
328:
1.72 markus 329: case oHostbasedAuthentication:
330: intptr = &options->hostbased_authentication;
331: goto parse_flag;
332:
1.59 markus 333: case oChallengeResponseAuthentication:
1.78 markus 334: intptr = &options->challenge_response_authentication;
1.17 markus 335: goto parse_flag;
1.16 markus 336:
1.1 deraadt 337: #ifdef KRB4
1.17 markus 338: case oKerberosAuthentication:
339: intptr = &options->kerberos_authentication;
340: goto parse_flag;
1.1 deraadt 341: #endif /* KRB4 */
342:
1.5 dugsong 343: #ifdef AFS
1.17 markus 344: case oKerberosTgtPassing:
345: intptr = &options->kerberos_tgt_passing;
346: goto parse_flag;
347:
348: case oAFSTokenPassing:
349: intptr = &options->afs_token_passing;
350: goto parse_flag;
1.1 deraadt 351: #endif
1.17 markus 352:
353: case oFallBackToRsh:
354: intptr = &options->fallback_to_rsh;
355: goto parse_flag;
356:
357: case oUseRsh:
358: intptr = &options->use_rsh;
359: goto parse_flag;
360:
361: case oBatchMode:
362: intptr = &options->batch_mode;
363: goto parse_flag;
364:
365: case oCheckHostIP:
366: intptr = &options->check_host_ip;
367: goto parse_flag;
368:
369: case oStrictHostKeyChecking:
370: intptr = &options->strict_host_key_checking;
1.42 provos 371: arg = strdelim(&s);
1.40 ho 372: if (!arg || *arg == '\0')
1.60 stevesk 373: fatal("%.200s line %d: Missing yes/no/ask argument.",
1.17 markus 374: filename, linenum);
375: value = 0; /* To avoid compiler warning... */
1.38 provos 376: if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
1.17 markus 377: value = 1;
1.38 provos 378: else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
1.17 markus 379: value = 0;
1.38 provos 380: else if (strcmp(arg, "ask") == 0)
1.17 markus 381: value = 2;
382: else
383: fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum);
384: if (*activep && *intptr == -1)
385: *intptr = value;
386: break;
387:
388: case oCompression:
389: intptr = &options->compression;
390: goto parse_flag;
391:
392: case oKeepAlives:
393: intptr = &options->keepalives;
394: goto parse_flag;
395:
396: case oNumberOfPasswordPrompts:
397: intptr = &options->number_of_password_prompts;
398: goto parse_int;
399:
400: case oCompressionLevel:
401: intptr = &options->compression_level;
402: goto parse_int;
403:
404: case oIdentityFile:
1.42 provos 405: arg = strdelim(&s);
1.40 ho 406: if (!arg || *arg == '\0')
1.17 markus 407: fatal("%.200s line %d: Missing argument.", filename, linenum);
408: if (*activep) {
1.50 markus 409: intptr = &options->num_identity_files;
1.27 markus 410: if (*intptr >= SSH_MAX_IDENTITY_FILES)
1.17 markus 411: fatal("%.200s line %d: Too many identity files specified (max %d).",
412: filename, linenum, SSH_MAX_IDENTITY_FILES);
1.50 markus 413: charptr = &options->identity_files[*intptr];
1.38 provos 414: *charptr = xstrdup(arg);
1.27 markus 415: *intptr = *intptr + 1;
1.17 markus 416: }
417: break;
418:
1.34 markus 419: case oXAuthLocation:
420: charptr=&options->xauth_location;
421: goto parse_string;
422:
1.17 markus 423: case oUser:
424: charptr = &options->user;
425: parse_string:
1.42 provos 426: arg = strdelim(&s);
1.40 ho 427: if (!arg || *arg == '\0')
1.17 markus 428: fatal("%.200s line %d: Missing argument.", filename, linenum);
429: if (*activep && *charptr == NULL)
1.38 provos 430: *charptr = xstrdup(arg);
1.17 markus 431: break;
432:
433: case oGlobalKnownHostsFile:
434: charptr = &options->system_hostfile;
435: goto parse_string;
436:
437: case oUserKnownHostsFile:
438: charptr = &options->user_hostfile;
439: goto parse_string;
440:
1.27 markus 441: case oGlobalKnownHostsFile2:
442: charptr = &options->system_hostfile2;
443: goto parse_string;
444:
445: case oUserKnownHostsFile2:
446: charptr = &options->user_hostfile2;
447: goto parse_string;
448:
1.17 markus 449: case oHostName:
450: charptr = &options->hostname;
451: goto parse_string;
452:
1.52 markus 453: case oHostKeyAlias:
454: charptr = &options->host_key_alias;
455: goto parse_string;
456:
1.67 markus 457: case oPreferredAuthentications:
458: charptr = &options->preferred_authentications;
459: goto parse_string;
460:
1.77 markus 461: case oBindAddress:
462: charptr = &options->bind_address;
463: goto parse_string;
464:
1.17 markus 465: case oProxyCommand:
466: charptr = &options->proxy_command;
467: string = xstrdup("");
1.42 provos 468: while ((arg = strdelim(&s)) != NULL && *arg != '\0') {
1.38 provos 469: string = xrealloc(string, strlen(string) + strlen(arg) + 2);
1.17 markus 470: strcat(string, " ");
1.38 provos 471: strcat(string, arg);
1.17 markus 472: }
473: if (*activep && *charptr == NULL)
474: *charptr = string;
475: else
476: xfree(string);
477: return 0;
478:
479: case oPort:
480: intptr = &options->port;
481: parse_int:
1.42 provos 482: arg = strdelim(&s);
1.40 ho 483: if (!arg || *arg == '\0')
1.17 markus 484: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 485: if (arg[0] < '0' || arg[0] > '9')
1.17 markus 486: fatal("%.200s line %d: Bad number.", filename, linenum);
1.21 markus 487:
488: /* Octal, decimal, or hex format? */
1.38 provos 489: value = strtol(arg, &endofnumber, 0);
490: if (arg == endofnumber)
1.21 markus 491: fatal("%.200s line %d: Bad number.", filename, linenum);
1.17 markus 492: if (*activep && *intptr == -1)
493: *intptr = value;
494: break;
495:
496: case oConnectionAttempts:
497: intptr = &options->connection_attempts;
498: goto parse_int;
499:
500: case oCipher:
501: intptr = &options->cipher;
1.42 provos 502: arg = strdelim(&s);
1.40 ho 503: if (!arg || *arg == '\0')
1.32 markus 504: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 505: value = cipher_number(arg);
1.17 markus 506: if (value == -1)
507: fatal("%.200s line %d: Bad cipher '%s'.",
1.38 provos 508: filename, linenum, arg ? arg : "<NONE>");
1.17 markus 509: if (*activep && *intptr == -1)
510: *intptr = value;
511: break;
512:
1.25 markus 513: case oCiphers:
1.42 provos 514: arg = strdelim(&s);
1.40 ho 515: if (!arg || *arg == '\0')
1.32 markus 516: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 517: if (!ciphers_valid(arg))
1.31 markus 518: fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.",
1.38 provos 519: filename, linenum, arg ? arg : "<NONE>");
1.25 markus 520: if (*activep && options->ciphers == NULL)
1.38 provos 521: options->ciphers = xstrdup(arg);
1.25 markus 522: break;
523:
1.62 markus 524: case oMacs:
525: arg = strdelim(&s);
526: if (!arg || *arg == '\0')
527: fatal("%.200s line %d: Missing argument.", filename, linenum);
528: if (!mac_valid(arg))
529: fatal("%.200s line %d: Bad SSH2 Mac spec '%s'.",
530: filename, linenum, arg ? arg : "<NONE>");
531: if (*activep && options->macs == NULL)
532: options->macs = xstrdup(arg);
533: break;
534:
1.76 markus 535: case oHostKeyAlgorithms:
536: arg = strdelim(&s);
537: if (!arg || *arg == '\0')
538: fatal("%.200s line %d: Missing argument.", filename, linenum);
539: if (!key_names_valid2(arg))
540: fatal("%.200s line %d: Bad protocol 2 host key algorithms '%s'.",
541: filename, linenum, arg ? arg : "<NONE>");
542: if (*activep && options->hostkeyalgorithms == NULL)
543: options->hostkeyalgorithms = xstrdup(arg);
544: break;
545:
1.25 markus 546: case oProtocol:
547: intptr = &options->protocol;
1.42 provos 548: arg = strdelim(&s);
1.40 ho 549: if (!arg || *arg == '\0')
1.32 markus 550: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 551: value = proto_spec(arg);
1.25 markus 552: if (value == SSH_PROTO_UNKNOWN)
553: fatal("%.200s line %d: Bad protocol spec '%s'.",
1.38 provos 554: filename, linenum, arg ? arg : "<NONE>");
1.25 markus 555: if (*activep && *intptr == SSH_PROTO_UNKNOWN)
556: *intptr = value;
557: break;
558:
1.17 markus 559: case oLogLevel:
560: intptr = (int *) &options->log_level;
1.42 provos 561: arg = strdelim(&s);
1.38 provos 562: value = log_level_number(arg);
1.17 markus 563: if (value == (LogLevel) - 1)
1.64 millert 564: fatal("%.200s line %d: unsupported log level '%s'",
1.38 provos 565: filename, linenum, arg ? arg : "<NONE>");
1.17 markus 566: if (*activep && (LogLevel) * intptr == -1)
567: *intptr = (LogLevel) value;
568: break;
569:
570: case oRemoteForward:
1.42 provos 571: arg = strdelim(&s);
1.40 ho 572: if (!arg || *arg == '\0')
1.17 markus 573: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.74 stevesk 574: fwd_port = a2port(arg);
575: if (fwd_port == 0)
1.17 markus 576: fatal("%.200s line %d: Badly formatted port number.",
577: filename, linenum);
1.42 provos 578: arg = strdelim(&s);
1.40 ho 579: if (!arg || *arg == '\0')
1.17 markus 580: fatal("%.200s line %d: Missing second argument.",
581: filename, linenum);
1.38 provos 582: if (sscanf(arg, "%255[^:]:%hu", buf, &fwd_host_port) != 2)
1.17 markus 583: fatal("%.200s line %d: Badly formatted host:port.",
584: filename, linenum);
585: if (*activep)
586: add_remote_forward(options, fwd_port, buf, fwd_host_port);
587: break;
588:
589: case oLocalForward:
1.42 provos 590: arg = strdelim(&s);
1.40 ho 591: if (!arg || *arg == '\0')
1.17 markus 592: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.74 stevesk 593: fwd_port = a2port(arg);
594: if (fwd_port == 0)
1.17 markus 595: fatal("%.200s line %d: Badly formatted port number.",
596: filename, linenum);
1.42 provos 597: arg = strdelim(&s);
1.40 ho 598: if (!arg || *arg == '\0')
1.17 markus 599: fatal("%.200s line %d: Missing second argument.",
600: filename, linenum);
1.38 provos 601: if (sscanf(arg, "%255[^:]:%hu", buf, &fwd_host_port) != 2)
1.17 markus 602: fatal("%.200s line %d: Badly formatted host:port.",
603: filename, linenum);
604: if (*activep)
605: add_local_forward(options, fwd_port, buf, fwd_host_port);
606: break;
1.71 markus 607:
608: case oDynamicForward:
609: arg = strdelim(&s);
610: if (!arg || *arg == '\0')
611: fatal("%.200s line %d: Missing port argument.",
612: filename, linenum);
1.74 stevesk 613: fwd_port = a2port(arg);
614: if (fwd_port == 0)
1.71 markus 615: fatal("%.200s line %d: Badly formatted port number.",
616: filename, linenum);
617: add_local_forward(options, fwd_port, "socks4", 0);
1.72 markus 618: break;
1.17 markus 619:
620: case oHost:
621: *activep = 0;
1.42 provos 622: while ((arg = strdelim(&s)) != NULL && *arg != '\0')
1.38 provos 623: if (match_pattern(host, arg)) {
624: debug("Applying options for %.100s", arg);
1.17 markus 625: *activep = 1;
626: break;
627: }
1.42 provos 628: /* Avoid garbage check below, as strdelim is done. */
1.17 markus 629: return 0;
630:
631: case oEscapeChar:
632: intptr = &options->escape_char;
1.42 provos 633: arg = strdelim(&s);
1.40 ho 634: if (!arg || *arg == '\0')
1.17 markus 635: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 636: if (arg[0] == '^' && arg[2] == 0 &&
1.51 markus 637: (u_char) arg[1] >= 64 && (u_char) arg[1] < 128)
638: value = (u_char) arg[1] & 31;
1.38 provos 639: else if (strlen(arg) == 1)
1.51 markus 640: value = (u_char) arg[0];
1.38 provos 641: else if (strcmp(arg, "none") == 0)
1.79 stevesk 642: value = SSH_ESCAPECHAR_NONE;
1.17 markus 643: else {
644: fatal("%.200s line %d: Bad escape character.",
645: filename, linenum);
646: /* NOTREACHED */
647: value = 0; /* Avoid compiler warning. */
648: }
649: if (*activep && *intptr == -1)
650: *intptr = value;
651: break;
652:
653: default:
654: fatal("process_config_line: Unimplemented opcode %d", opcode);
655: }
656:
657: /* Check that there is no garbage at end of line. */
1.57 djm 658: if ((arg = strdelim(&s)) != NULL && *arg != '\0') {
1.39 ho 659: fatal("%.200s line %d: garbage at end of line; \"%.200s\".",
660: filename, linenum, arg);
661: }
1.17 markus 662: return 0;
1.1 deraadt 663: }
664:
665:
1.19 markus 666: /*
667: * Reads the config file and modifies the options accordingly. Options
668: * should already be initialized before this call. This never returns if
669: * there is an error. If the file does not exist, this returns immediately.
670: */
1.1 deraadt 671:
1.26 markus 672: void
1.17 markus 673: read_config_file(const char *filename, const char *host, Options *options)
1.1 deraadt 674: {
1.17 markus 675: FILE *f;
676: char line[1024];
677: int active, linenum;
678: int bad_options = 0;
679:
680: /* Open the file. */
681: f = fopen(filename, "r");
682: if (!f)
683: return;
684:
685: debug("Reading configuration data %.200s", filename);
686:
1.19 markus 687: /*
688: * Mark that we are now processing the options. This flag is turned
689: * on/off by Host specifications.
690: */
1.17 markus 691: active = 1;
692: linenum = 0;
693: while (fgets(line, sizeof(line), f)) {
694: /* Update line number counter. */
695: linenum++;
696: if (process_config_line(options, host, line, filename, linenum, &active) != 0)
697: bad_options++;
698: }
699: fclose(f);
700: if (bad_options > 0)
1.64 millert 701: fatal("%s: terminating, %d bad configuration options",
1.17 markus 702: filename, bad_options);
1.1 deraadt 703: }
704:
1.19 markus 705: /*
706: * Initializes options to special values that indicate that they have not yet
707: * been set. Read_config_file will only set options with this value. Options
708: * are processed in the following order: command line, user config file,
709: * system config file. Last, fill_default_options is called.
710: */
1.1 deraadt 711:
1.26 markus 712: void
1.17 markus 713: initialize_options(Options * options)
1.1 deraadt 714: {
1.17 markus 715: memset(options, 'X', sizeof(*options));
716: options->forward_agent = -1;
717: options->forward_x11 = -1;
1.34 markus 718: options->xauth_location = NULL;
1.17 markus 719: options->gateway_ports = -1;
720: options->use_privileged_port = -1;
721: options->rhosts_authentication = -1;
722: options->rsa_authentication = -1;
1.50 markus 723: options->pubkey_authentication = -1;
1.78 markus 724: options->challenge_response_authentication = -1;
1.1 deraadt 725: #ifdef KRB4
1.17 markus 726: options->kerberos_authentication = -1;
1.1 deraadt 727: #endif
1.5 dugsong 728: #ifdef AFS
1.17 markus 729: options->kerberos_tgt_passing = -1;
730: options->afs_token_passing = -1;
1.1 deraadt 731: #endif
1.17 markus 732: options->password_authentication = -1;
1.48 markus 733: options->kbd_interactive_authentication = -1;
734: options->kbd_interactive_devices = NULL;
1.17 markus 735: options->rhosts_rsa_authentication = -1;
1.72 markus 736: options->hostbased_authentication = -1;
1.17 markus 737: options->fallback_to_rsh = -1;
738: options->use_rsh = -1;
739: options->batch_mode = -1;
740: options->check_host_ip = -1;
741: options->strict_host_key_checking = -1;
742: options->compression = -1;
743: options->keepalives = -1;
744: options->compression_level = -1;
745: options->port = -1;
746: options->connection_attempts = -1;
747: options->number_of_password_prompts = -1;
748: options->cipher = -1;
1.25 markus 749: options->ciphers = NULL;
1.62 markus 750: options->macs = NULL;
1.76 markus 751: options->hostkeyalgorithms = NULL;
1.25 markus 752: options->protocol = SSH_PROTO_UNKNOWN;
1.17 markus 753: options->num_identity_files = 0;
754: options->hostname = NULL;
1.52 markus 755: options->host_key_alias = NULL;
1.17 markus 756: options->proxy_command = NULL;
757: options->user = NULL;
758: options->escape_char = -1;
759: options->system_hostfile = NULL;
760: options->user_hostfile = NULL;
1.27 markus 761: options->system_hostfile2 = NULL;
762: options->user_hostfile2 = NULL;
1.17 markus 763: options->num_local_forwards = 0;
764: options->num_remote_forwards = 0;
765: options->log_level = (LogLevel) - 1;
1.67 markus 766: options->preferred_authentications = NULL;
1.77 markus 767: options->bind_address = NULL;
1.1 deraadt 768: }
769:
1.19 markus 770: /*
771: * Called after processing other sources of option data, this fills those
772: * options for which no value has been specified with their default values.
773: */
1.1 deraadt 774:
1.26 markus 775: void
1.17 markus 776: fill_default_options(Options * options)
1.1 deraadt 777: {
1.61 deraadt 778: int len;
779:
1.17 markus 780: if (options->forward_agent == -1)
1.33 markus 781: options->forward_agent = 0;
1.17 markus 782: if (options->forward_x11 == -1)
1.23 markus 783: options->forward_x11 = 0;
1.80 markus 784: #ifdef _PATH_XAUTH
1.34 markus 785: if (options->xauth_location == NULL)
1.80 markus 786: options->xauth_location = _PATH_XAUTH;
787: #endif
1.17 markus 788: if (options->gateway_ports == -1)
789: options->gateway_ports = 0;
790: if (options->use_privileged_port == -1)
1.65 markus 791: options->use_privileged_port = 0;
1.17 markus 792: if (options->rhosts_authentication == -1)
793: options->rhosts_authentication = 1;
794: if (options->rsa_authentication == -1)
795: options->rsa_authentication = 1;
1.50 markus 796: if (options->pubkey_authentication == -1)
797: options->pubkey_authentication = 1;
1.78 markus 798: if (options->challenge_response_authentication == -1)
799: options->challenge_response_authentication = 0;
1.1 deraadt 800: #ifdef KRB4
1.17 markus 801: if (options->kerberos_authentication == -1)
1.45 provos 802: options->kerberos_authentication = 1;
1.5 dugsong 803: #endif /* KRB4 */
804: #ifdef AFS
1.17 markus 805: if (options->kerberos_tgt_passing == -1)
806: options->kerberos_tgt_passing = 1;
807: if (options->afs_token_passing == -1)
808: options->afs_token_passing = 1;
1.5 dugsong 809: #endif /* AFS */
1.17 markus 810: if (options->password_authentication == -1)
811: options->password_authentication = 1;
1.48 markus 812: if (options->kbd_interactive_authentication == -1)
1.59 markus 813: options->kbd_interactive_authentication = 1;
1.17 markus 814: if (options->rhosts_rsa_authentication == -1)
815: options->rhosts_rsa_authentication = 1;
1.72 markus 816: if (options->hostbased_authentication == -1)
817: options->hostbased_authentication = 0;
1.17 markus 818: if (options->fallback_to_rsh == -1)
1.41 deraadt 819: options->fallback_to_rsh = 0;
1.17 markus 820: if (options->use_rsh == -1)
821: options->use_rsh = 0;
822: if (options->batch_mode == -1)
823: options->batch_mode = 0;
824: if (options->check_host_ip == -1)
825: options->check_host_ip = 1;
826: if (options->strict_host_key_checking == -1)
827: options->strict_host_key_checking = 2; /* 2 is default */
828: if (options->compression == -1)
829: options->compression = 0;
830: if (options->keepalives == -1)
831: options->keepalives = 1;
832: if (options->compression_level == -1)
833: options->compression_level = 6;
834: if (options->port == -1)
835: options->port = 0; /* Filled in ssh_connect. */
836: if (options->connection_attempts == -1)
837: options->connection_attempts = 4;
838: if (options->number_of_password_prompts == -1)
839: options->number_of_password_prompts = 3;
840: /* Selected in ssh_login(). */
841: if (options->cipher == -1)
842: options->cipher = SSH_CIPHER_NOT_SET;
1.31 markus 843: /* options->ciphers, default set in myproposals.h */
1.62 markus 844: /* options->macs, default set in myproposals.h */
1.76 markus 845: /* options->hostkeyalgorithms, default set in myproposals.h */
1.25 markus 846: if (options->protocol == SSH_PROTO_UNKNOWN)
1.69 markus 847: options->protocol = SSH_PROTO_1|SSH_PROTO_2;
1.17 markus 848: if (options->num_identity_files == 0) {
1.50 markus 849: if (options->protocol & SSH_PROTO_1) {
1.61 deraadt 850: len = 2 + strlen(_PATH_SSH_CLIENT_IDENTITY) + 1;
1.50 markus 851: options->identity_files[options->num_identity_files] =
1.61 deraadt 852: xmalloc(len);
853: snprintf(options->identity_files[options->num_identity_files++],
854: len, "~/%.100s", _PATH_SSH_CLIENT_IDENTITY);
1.50 markus 855: }
856: if (options->protocol & SSH_PROTO_2) {
1.63 deraadt 857: len = 2 + strlen(_PATH_SSH_CLIENT_ID_RSA) + 1;
858: options->identity_files[options->num_identity_files] =
859: xmalloc(len);
860: snprintf(options->identity_files[options->num_identity_files++],
861: len, "~/%.100s", _PATH_SSH_CLIENT_ID_RSA);
862:
1.61 deraadt 863: len = 2 + strlen(_PATH_SSH_CLIENT_ID_DSA) + 1;
1.50 markus 864: options->identity_files[options->num_identity_files] =
1.61 deraadt 865: xmalloc(len);
866: snprintf(options->identity_files[options->num_identity_files++],
867: len, "~/%.100s", _PATH_SSH_CLIENT_ID_DSA);
1.50 markus 868: }
1.27 markus 869: }
1.17 markus 870: if (options->escape_char == -1)
871: options->escape_char = '~';
872: if (options->system_hostfile == NULL)
1.55 markus 873: options->system_hostfile = _PATH_SSH_SYSTEM_HOSTFILE;
1.17 markus 874: if (options->user_hostfile == NULL)
1.55 markus 875: options->user_hostfile = _PATH_SSH_USER_HOSTFILE;
1.27 markus 876: if (options->system_hostfile2 == NULL)
1.55 markus 877: options->system_hostfile2 = _PATH_SSH_SYSTEM_HOSTFILE2;
1.27 markus 878: if (options->user_hostfile2 == NULL)
1.55 markus 879: options->user_hostfile2 = _PATH_SSH_USER_HOSTFILE2;
1.17 markus 880: if (options->log_level == (LogLevel) - 1)
1.54 markus 881: options->log_level = SYSLOG_LEVEL_INFO;
1.17 markus 882: /* options->proxy_command should not be set by default */
883: /* options->user will be set in the main program if appropriate */
884: /* options->hostname will be set in the main program if appropriate */
1.52 markus 885: /* options->host_key_alias should not be set by default */
1.67 markus 886: /* options->preferred_authentications will be set in ssh */
1.1 deraadt 887: }
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