Annotation of src/usr.bin/ssh/readconf.c, Revision 1.49.2.2
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"
1.49.2.1 jason 15: RCSID("$OpenBSD: readconf.c,v 1.62 2001/02/11 12:59:25 markus Exp $");
1.1 deraadt 16:
17: #include "ssh.h"
18: #include "xmalloc.h"
1.25 markus 19: #include "compat.h"
1.49.2.1 jason 20: #include "cipher.h"
21: #include "pathnames.h"
22: #include "log.h"
23: #include "readconf.h"
24: #include "match.h"
25: #include "misc.h"
26: #include "kex.h"
27: #include "mac.h"
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
1.49.2.1 jason 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,
1.49.2.1 jason 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,
1.49.2.1 jason 109: oCompressionLevel, oKeepAlives, oNumberOfPasswordPrompts,
110: oUsePrivilegedPort, oLogLevel, oCiphers, oProtocol, oMacs,
111: oGlobalKnownHostsFile2, oUserKnownHostsFile2, oPubkeyAuthentication,
112: oKbdInteractiveAuthentication, oKbdInteractiveDevices, oHostKeyAlias
1.1 deraadt 113: } OpCodes;
114:
115: /* Textual representations of the tokens. */
116:
1.17 markus 117: static struct {
118: const char *name;
119: OpCodes opcode;
120: } keywords[] = {
121: { "forwardagent", oForwardAgent },
122: { "forwardx11", oForwardX11 },
1.34 markus 123: { "xauthlocation", oXAuthLocation },
1.17 markus 124: { "gatewayports", oGatewayPorts },
125: { "useprivilegedport", oUsePrivilegedPort },
126: { "rhostsauthentication", oRhostsAuthentication },
127: { "passwordauthentication", oPasswordAuthentication },
1.48 markus 128: { "kbdinteractiveauthentication", oKbdInteractiveAuthentication },
129: { "kbdinteractivedevices", oKbdInteractiveDevices },
1.17 markus 130: { "rsaauthentication", oRSAAuthentication },
1.49.2.1 jason 131: { "pubkeyauthentication", oPubkeyAuthentication },
132: { "dsaauthentication", oPubkeyAuthentication }, /* alias */
133: { "challengeresponseauthentication", oChallengeResponseAuthentication },
134: { "skeyauthentication", oChallengeResponseAuthentication }, /* alias */
135: { "tisauthentication", oChallengeResponseAuthentication }, /* alias */
1.1 deraadt 136: #ifdef KRB4
1.17 markus 137: { "kerberosauthentication", oKerberosAuthentication },
1.1 deraadt 138: #endif /* KRB4 */
1.5 dugsong 139: #ifdef AFS
1.17 markus 140: { "kerberostgtpassing", oKerberosTgtPassing },
141: { "afstokenpassing", oAFSTokenPassing },
1.1 deraadt 142: #endif
1.17 markus 143: { "fallbacktorsh", oFallBackToRsh },
144: { "usersh", oUseRsh },
145: { "identityfile", oIdentityFile },
1.49.2.1 jason 146: { "identityfile2", oIdentityFile }, /* alias */
1.17 markus 147: { "hostname", oHostName },
1.49.2.1 jason 148: { "hostkeyalias", oHostKeyAlias },
1.17 markus 149: { "proxycommand", oProxyCommand },
150: { "port", oPort },
151: { "cipher", oCipher },
1.25 markus 152: { "ciphers", oCiphers },
1.49.2.1 jason 153: { "macs", oMacs },
1.25 markus 154: { "protocol", oProtocol },
1.17 markus 155: { "remoteforward", oRemoteForward },
156: { "localforward", oLocalForward },
157: { "user", oUser },
158: { "host", oHost },
159: { "escapechar", oEscapeChar },
160: { "rhostsrsaauthentication", oRhostsRSAAuthentication },
161: { "globalknownhostsfile", oGlobalKnownHostsFile },
162: { "userknownhostsfile", oUserKnownHostsFile },
1.27 markus 163: { "globalknownhostsfile2", oGlobalKnownHostsFile2 },
164: { "userknownhostsfile2", oUserKnownHostsFile2 },
1.17 markus 165: { "connectionattempts", oConnectionAttempts },
166: { "batchmode", oBatchMode },
167: { "checkhostip", oCheckHostIP },
168: { "stricthostkeychecking", oStrictHostKeyChecking },
169: { "compression", oCompression },
170: { "compressionlevel", oCompressionLevel },
171: { "keepalive", oKeepAlives },
172: { "numberofpasswordprompts", oNumberOfPasswordPrompts },
173: { "loglevel", oLogLevel },
174: { NULL, 0 }
1.13 markus 175: };
176:
1.19 markus 177: /*
178: * Adds a local TCP/IP port forward to options. Never returns if there is an
179: * error.
180: */
1.1 deraadt 181:
1.26 markus 182: void
1.22 markus 183: add_local_forward(Options *options, u_short port, const char *host,
184: u_short host_port)
1.1 deraadt 185: {
1.17 markus 186: Forward *fwd;
187: extern uid_t original_real_uid;
188: if (port < IPPORT_RESERVED && original_real_uid != 0)
189: fatal("Privileged ports can only be forwarded by root.\n");
190: if (options->num_local_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
191: fatal("Too many local forwards (max %d).", SSH_MAX_FORWARDS_PER_DIRECTION);
192: fwd = &options->local_forwards[options->num_local_forwards++];
193: fwd->port = port;
194: fwd->host = xstrdup(host);
195: fwd->host_port = host_port;
1.1 deraadt 196: }
197:
1.19 markus 198: /*
199: * Adds a remote TCP/IP port forward to options. Never returns if there is
200: * an error.
201: */
1.1 deraadt 202:
1.26 markus 203: void
1.22 markus 204: add_remote_forward(Options *options, u_short port, const char *host,
205: u_short host_port)
1.1 deraadt 206: {
1.17 markus 207: Forward *fwd;
208: if (options->num_remote_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
209: fatal("Too many remote forwards (max %d).",
210: SSH_MAX_FORWARDS_PER_DIRECTION);
211: fwd = &options->remote_forwards[options->num_remote_forwards++];
212: fwd->port = port;
213: fwd->host = xstrdup(host);
214: fwd->host_port = host_port;
1.1 deraadt 215: }
216:
1.19 markus 217: /*
218: * Returns the number of the token pointed to by cp of length len. Never
219: * returns if the token is not known.
220: */
1.1 deraadt 221:
1.26 markus 222: static OpCodes
1.17 markus 223: parse_token(const char *cp, const char *filename, int linenum)
1.1 deraadt 224: {
1.49.2.1 jason 225: u_int i;
1.1 deraadt 226:
1.17 markus 227: for (i = 0; keywords[i].name; i++)
1.20 markus 228: if (strcasecmp(cp, keywords[i].name) == 0)
1.17 markus 229: return keywords[i].opcode;
230:
231: fprintf(stderr, "%s: line %d: Bad configuration option: %s\n",
232: filename, linenum, cp);
233: return oBadOption;
1.1 deraadt 234: }
235:
1.19 markus 236: /*
237: * Processes a single option line as used in the configuration files. This
238: * only sets those values that have not already been set.
239: */
1.1 deraadt 240:
1.14 markus 241: int
242: process_config_line(Options *options, const char *host,
1.17 markus 243: char *line, const char *filename, int linenum,
244: int *activep)
1.1 deraadt 245: {
1.38 provos 246: char buf[256], *s, *string, **charptr, *endofnumber, *keyword, *arg;
1.22 markus 247: int opcode, *intptr, value;
248: u_short fwd_port, fwd_host_port;
1.1 deraadt 249:
1.42 provos 250: s = line;
251: /* Get the keyword. (Each line is supposed to begin with a keyword). */
252: keyword = strdelim(&s);
253: /* Ignore leading whitespace. */
254: if (*keyword == '\0')
1.43 markus 255: keyword = strdelim(&s);
1.49.2.1 jason 256: if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#')
1.17 markus 257: return 0;
258:
1.38 provos 259: opcode = parse_token(keyword, filename, linenum);
1.17 markus 260:
261: switch (opcode) {
262: case oBadOption:
1.19 markus 263: /* don't panic, but count bad options */
264: return -1;
1.17 markus 265: /* NOTREACHED */
266: case oForwardAgent:
267: intptr = &options->forward_agent;
268: parse_flag:
1.42 provos 269: arg = strdelim(&s);
1.40 ho 270: if (!arg || *arg == '\0')
1.17 markus 271: fatal("%.200s line %d: Missing yes/no argument.", filename, linenum);
272: value = 0; /* To avoid compiler warning... */
1.38 provos 273: if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
1.17 markus 274: value = 1;
1.38 provos 275: else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
1.17 markus 276: value = 0;
277: else
278: fatal("%.200s line %d: Bad yes/no argument.", filename, linenum);
279: if (*activep && *intptr == -1)
280: *intptr = value;
281: break;
282:
283: case oForwardX11:
284: intptr = &options->forward_x11;
285: goto parse_flag;
286:
287: case oGatewayPorts:
288: intptr = &options->gateway_ports;
289: goto parse_flag;
290:
291: case oUsePrivilegedPort:
292: intptr = &options->use_privileged_port;
293: goto parse_flag;
294:
295: case oRhostsAuthentication:
296: intptr = &options->rhosts_authentication;
297: goto parse_flag;
298:
299: case oPasswordAuthentication:
300: intptr = &options->password_authentication;
301: goto parse_flag;
302:
1.48 markus 303: case oKbdInteractiveAuthentication:
304: intptr = &options->kbd_interactive_authentication;
305: goto parse_flag;
306:
307: case oKbdInteractiveDevices:
308: charptr = &options->kbd_interactive_devices;
309: goto parse_string;
310:
1.49.2.1 jason 311: case oPubkeyAuthentication:
312: intptr = &options->pubkey_authentication;
1.30 markus 313: goto parse_flag;
314:
1.17 markus 315: case oRSAAuthentication:
316: intptr = &options->rsa_authentication;
317: goto parse_flag;
318:
319: case oRhostsRSAAuthentication:
320: intptr = &options->rhosts_rsa_authentication;
321: goto parse_flag;
322:
1.49.2.1 jason 323: case oChallengeResponseAuthentication:
324: intptr = &options->challenge_reponse_authentication;
1.17 markus 325: goto parse_flag;
1.16 markus 326:
1.1 deraadt 327: #ifdef KRB4
1.17 markus 328: case oKerberosAuthentication:
329: intptr = &options->kerberos_authentication;
330: goto parse_flag;
1.1 deraadt 331: #endif /* KRB4 */
332:
1.5 dugsong 333: #ifdef AFS
1.17 markus 334: case oKerberosTgtPassing:
335: intptr = &options->kerberos_tgt_passing;
336: goto parse_flag;
337:
338: case oAFSTokenPassing:
339: intptr = &options->afs_token_passing;
340: goto parse_flag;
1.1 deraadt 341: #endif
1.17 markus 342:
343: case oFallBackToRsh:
344: intptr = &options->fallback_to_rsh;
345: goto parse_flag;
346:
347: case oUseRsh:
348: intptr = &options->use_rsh;
349: goto parse_flag;
350:
351: case oBatchMode:
352: intptr = &options->batch_mode;
353: goto parse_flag;
354:
355: case oCheckHostIP:
356: intptr = &options->check_host_ip;
357: goto parse_flag;
358:
359: case oStrictHostKeyChecking:
360: intptr = &options->strict_host_key_checking;
1.42 provos 361: arg = strdelim(&s);
1.40 ho 362: if (!arg || *arg == '\0')
1.49.2.1 jason 363: fatal("%.200s line %d: Missing yes/no/ask argument.",
1.17 markus 364: filename, linenum);
365: value = 0; /* To avoid compiler warning... */
1.38 provos 366: if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
1.17 markus 367: value = 1;
1.38 provos 368: else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
1.17 markus 369: value = 0;
1.38 provos 370: else if (strcmp(arg, "ask") == 0)
1.17 markus 371: value = 2;
372: else
373: fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum);
374: if (*activep && *intptr == -1)
375: *intptr = value;
376: break;
377:
378: case oCompression:
379: intptr = &options->compression;
380: goto parse_flag;
381:
382: case oKeepAlives:
383: intptr = &options->keepalives;
384: goto parse_flag;
385:
386: case oNumberOfPasswordPrompts:
387: intptr = &options->number_of_password_prompts;
388: goto parse_int;
389:
390: case oCompressionLevel:
391: intptr = &options->compression_level;
392: goto parse_int;
393:
394: case oIdentityFile:
1.42 provos 395: arg = strdelim(&s);
1.40 ho 396: if (!arg || *arg == '\0')
1.17 markus 397: fatal("%.200s line %d: Missing argument.", filename, linenum);
398: if (*activep) {
1.49.2.1 jason 399: intptr = &options->num_identity_files;
1.27 markus 400: if (*intptr >= SSH_MAX_IDENTITY_FILES)
1.17 markus 401: fatal("%.200s line %d: Too many identity files specified (max %d).",
402: filename, linenum, SSH_MAX_IDENTITY_FILES);
1.49.2.1 jason 403: charptr = &options->identity_files[*intptr];
1.38 provos 404: *charptr = xstrdup(arg);
1.27 markus 405: *intptr = *intptr + 1;
1.17 markus 406: }
407: break;
408:
1.34 markus 409: case oXAuthLocation:
410: charptr=&options->xauth_location;
411: goto parse_string;
412:
1.17 markus 413: case oUser:
414: charptr = &options->user;
415: parse_string:
1.42 provos 416: arg = strdelim(&s);
1.40 ho 417: if (!arg || *arg == '\0')
1.17 markus 418: fatal("%.200s line %d: Missing argument.", filename, linenum);
419: if (*activep && *charptr == NULL)
1.38 provos 420: *charptr = xstrdup(arg);
1.17 markus 421: break;
422:
423: case oGlobalKnownHostsFile:
424: charptr = &options->system_hostfile;
425: goto parse_string;
426:
427: case oUserKnownHostsFile:
428: charptr = &options->user_hostfile;
429: goto parse_string;
430:
1.27 markus 431: case oGlobalKnownHostsFile2:
432: charptr = &options->system_hostfile2;
433: goto parse_string;
434:
435: case oUserKnownHostsFile2:
436: charptr = &options->user_hostfile2;
437: goto parse_string;
438:
1.17 markus 439: case oHostName:
440: charptr = &options->hostname;
441: goto parse_string;
442:
1.49.2.1 jason 443: case oHostKeyAlias:
444: charptr = &options->host_key_alias;
445: goto parse_string;
446:
1.17 markus 447: case oProxyCommand:
448: charptr = &options->proxy_command;
449: string = xstrdup("");
1.42 provos 450: while ((arg = strdelim(&s)) != NULL && *arg != '\0') {
1.38 provos 451: string = xrealloc(string, strlen(string) + strlen(arg) + 2);
1.17 markus 452: strcat(string, " ");
1.38 provos 453: strcat(string, arg);
1.17 markus 454: }
455: if (*activep && *charptr == NULL)
456: *charptr = string;
457: else
458: xfree(string);
459: return 0;
460:
461: case oPort:
462: intptr = &options->port;
463: parse_int:
1.42 provos 464: arg = strdelim(&s);
1.40 ho 465: if (!arg || *arg == '\0')
1.17 markus 466: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 467: if (arg[0] < '0' || arg[0] > '9')
1.17 markus 468: fatal("%.200s line %d: Bad number.", filename, linenum);
1.21 markus 469:
470: /* Octal, decimal, or hex format? */
1.38 provos 471: value = strtol(arg, &endofnumber, 0);
472: if (arg == endofnumber)
1.21 markus 473: fatal("%.200s line %d: Bad number.", filename, linenum);
1.17 markus 474: if (*activep && *intptr == -1)
475: *intptr = value;
476: break;
477:
478: case oConnectionAttempts:
479: intptr = &options->connection_attempts;
480: goto parse_int;
481:
482: case oCipher:
483: intptr = &options->cipher;
1.42 provos 484: arg = strdelim(&s);
1.40 ho 485: if (!arg || *arg == '\0')
1.32 markus 486: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 487: value = cipher_number(arg);
1.17 markus 488: if (value == -1)
489: fatal("%.200s line %d: Bad cipher '%s'.",
1.38 provos 490: filename, linenum, arg ? arg : "<NONE>");
1.17 markus 491: if (*activep && *intptr == -1)
492: *intptr = value;
493: break;
494:
1.25 markus 495: case oCiphers:
1.42 provos 496: arg = strdelim(&s);
1.40 ho 497: if (!arg || *arg == '\0')
1.32 markus 498: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 499: if (!ciphers_valid(arg))
1.31 markus 500: fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.",
1.38 provos 501: filename, linenum, arg ? arg : "<NONE>");
1.25 markus 502: if (*activep && options->ciphers == NULL)
1.38 provos 503: options->ciphers = xstrdup(arg);
1.25 markus 504: break;
505:
1.49.2.1 jason 506: case oMacs:
507: arg = strdelim(&s);
508: if (!arg || *arg == '\0')
509: fatal("%.200s line %d: Missing argument.", filename, linenum);
510: if (!mac_valid(arg))
511: fatal("%.200s line %d: Bad SSH2 Mac spec '%s'.",
512: filename, linenum, arg ? arg : "<NONE>");
513: if (*activep && options->macs == NULL)
514: options->macs = xstrdup(arg);
515: break;
516:
1.25 markus 517: case oProtocol:
518: intptr = &options->protocol;
1.42 provos 519: arg = strdelim(&s);
1.40 ho 520: if (!arg || *arg == '\0')
1.32 markus 521: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 522: value = proto_spec(arg);
1.25 markus 523: if (value == SSH_PROTO_UNKNOWN)
524: fatal("%.200s line %d: Bad protocol spec '%s'.",
1.38 provos 525: filename, linenum, arg ? arg : "<NONE>");
1.25 markus 526: if (*activep && *intptr == SSH_PROTO_UNKNOWN)
527: *intptr = value;
528: break;
529:
1.17 markus 530: case oLogLevel:
531: intptr = (int *) &options->log_level;
1.42 provos 532: arg = strdelim(&s);
1.38 provos 533: value = log_level_number(arg);
1.17 markus 534: if (value == (LogLevel) - 1)
535: fatal("%.200s line %d: unsupported log level '%s'\n",
1.38 provos 536: filename, linenum, arg ? arg : "<NONE>");
1.17 markus 537: if (*activep && (LogLevel) * intptr == -1)
538: *intptr = (LogLevel) value;
539: break;
540:
541: case oRemoteForward:
1.42 provos 542: arg = strdelim(&s);
1.40 ho 543: if (!arg || *arg == '\0')
1.17 markus 544: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 545: if (arg[0] < '0' || arg[0] > '9')
1.17 markus 546: fatal("%.200s line %d: Badly formatted port number.",
547: filename, linenum);
1.38 provos 548: fwd_port = atoi(arg);
1.42 provos 549: arg = strdelim(&s);
1.40 ho 550: if (!arg || *arg == '\0')
1.17 markus 551: fatal("%.200s line %d: Missing second argument.",
552: filename, linenum);
1.38 provos 553: if (sscanf(arg, "%255[^:]:%hu", buf, &fwd_host_port) != 2)
1.17 markus 554: fatal("%.200s line %d: Badly formatted host:port.",
555: filename, linenum);
556: if (*activep)
557: add_remote_forward(options, fwd_port, buf, fwd_host_port);
558: break;
559:
560: case oLocalForward:
1.42 provos 561: arg = strdelim(&s);
1.40 ho 562: if (!arg || *arg == '\0')
1.17 markus 563: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 564: if (arg[0] < '0' || arg[0] > '9')
1.17 markus 565: fatal("%.200s line %d: Badly formatted port number.",
566: filename, linenum);
1.38 provos 567: fwd_port = atoi(arg);
1.42 provos 568: arg = strdelim(&s);
1.40 ho 569: if (!arg || *arg == '\0')
1.17 markus 570: fatal("%.200s line %d: Missing second argument.",
571: filename, linenum);
1.38 provos 572: if (sscanf(arg, "%255[^:]:%hu", buf, &fwd_host_port) != 2)
1.17 markus 573: fatal("%.200s line %d: Badly formatted host:port.",
574: filename, linenum);
575: if (*activep)
576: add_local_forward(options, fwd_port, buf, fwd_host_port);
577: break;
578:
579: case oHost:
580: *activep = 0;
1.42 provos 581: while ((arg = strdelim(&s)) != NULL && *arg != '\0')
1.38 provos 582: if (match_pattern(host, arg)) {
583: debug("Applying options for %.100s", arg);
1.17 markus 584: *activep = 1;
585: break;
586: }
1.42 provos 587: /* Avoid garbage check below, as strdelim is done. */
1.17 markus 588: return 0;
589:
590: case oEscapeChar:
591: intptr = &options->escape_char;
1.42 provos 592: arg = strdelim(&s);
1.40 ho 593: if (!arg || *arg == '\0')
1.17 markus 594: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 595: if (arg[0] == '^' && arg[2] == 0 &&
1.49.2.1 jason 596: (u_char) arg[1] >= 64 && (u_char) arg[1] < 128)
597: value = (u_char) arg[1] & 31;
1.38 provos 598: else if (strlen(arg) == 1)
1.49.2.1 jason 599: value = (u_char) arg[0];
1.38 provos 600: else if (strcmp(arg, "none") == 0)
1.17 markus 601: value = -2;
602: else {
603: fatal("%.200s line %d: Bad escape character.",
604: filename, linenum);
605: /* NOTREACHED */
606: value = 0; /* Avoid compiler warning. */
607: }
608: if (*activep && *intptr == -1)
609: *intptr = value;
610: break;
611:
612: default:
613: fatal("process_config_line: Unimplemented opcode %d", opcode);
614: }
615:
616: /* Check that there is no garbage at end of line. */
1.49.2.1 jason 617: if ((arg = strdelim(&s)) != NULL && *arg != '\0') {
1.39 ho 618: fatal("%.200s line %d: garbage at end of line; \"%.200s\".",
619: filename, linenum, arg);
620: }
1.17 markus 621: return 0;
1.1 deraadt 622: }
623:
624:
1.19 markus 625: /*
626: * Reads the config file and modifies the options accordingly. Options
627: * should already be initialized before this call. This never returns if
628: * there is an error. If the file does not exist, this returns immediately.
629: */
1.1 deraadt 630:
1.26 markus 631: void
1.17 markus 632: read_config_file(const char *filename, const char *host, Options *options)
1.1 deraadt 633: {
1.17 markus 634: FILE *f;
635: char line[1024];
636: int active, linenum;
637: int bad_options = 0;
638:
639: /* Open the file. */
640: f = fopen(filename, "r");
641: if (!f)
642: return;
643:
644: debug("Reading configuration data %.200s", filename);
645:
1.19 markus 646: /*
647: * Mark that we are now processing the options. This flag is turned
648: * on/off by Host specifications.
649: */
1.17 markus 650: active = 1;
651: linenum = 0;
652: while (fgets(line, sizeof(line), f)) {
653: /* Update line number counter. */
654: linenum++;
655: if (process_config_line(options, host, line, filename, linenum, &active) != 0)
656: bad_options++;
657: }
658: fclose(f);
659: if (bad_options > 0)
660: fatal("%s: terminating, %d bad configuration options\n",
661: filename, bad_options);
1.1 deraadt 662: }
663:
1.19 markus 664: /*
665: * Initializes options to special values that indicate that they have not yet
666: * been set. Read_config_file will only set options with this value. Options
667: * are processed in the following order: command line, user config file,
668: * system config file. Last, fill_default_options is called.
669: */
1.1 deraadt 670:
1.26 markus 671: void
1.17 markus 672: initialize_options(Options * options)
1.1 deraadt 673: {
1.17 markus 674: memset(options, 'X', sizeof(*options));
675: options->forward_agent = -1;
676: options->forward_x11 = -1;
1.34 markus 677: options->xauth_location = NULL;
1.17 markus 678: options->gateway_ports = -1;
679: options->use_privileged_port = -1;
680: options->rhosts_authentication = -1;
681: options->rsa_authentication = -1;
1.49.2.1 jason 682: options->pubkey_authentication = -1;
683: options->challenge_reponse_authentication = -1;
1.1 deraadt 684: #ifdef KRB4
1.17 markus 685: options->kerberos_authentication = -1;
1.1 deraadt 686: #endif
1.5 dugsong 687: #ifdef AFS
1.17 markus 688: options->kerberos_tgt_passing = -1;
689: options->afs_token_passing = -1;
1.1 deraadt 690: #endif
1.17 markus 691: options->password_authentication = -1;
1.48 markus 692: options->kbd_interactive_authentication = -1;
693: options->kbd_interactive_devices = NULL;
1.17 markus 694: options->rhosts_rsa_authentication = -1;
695: options->fallback_to_rsh = -1;
696: options->use_rsh = -1;
697: options->batch_mode = -1;
698: options->check_host_ip = -1;
699: options->strict_host_key_checking = -1;
700: options->compression = -1;
701: options->keepalives = -1;
702: options->compression_level = -1;
703: options->port = -1;
704: options->connection_attempts = -1;
705: options->number_of_password_prompts = -1;
706: options->cipher = -1;
1.25 markus 707: options->ciphers = NULL;
1.49.2.1 jason 708: options->macs = NULL;
1.25 markus 709: options->protocol = SSH_PROTO_UNKNOWN;
1.17 markus 710: options->num_identity_files = 0;
711: options->hostname = NULL;
1.49.2.1 jason 712: options->host_key_alias = NULL;
1.17 markus 713: options->proxy_command = NULL;
714: options->user = NULL;
715: options->escape_char = -1;
716: options->system_hostfile = NULL;
717: options->user_hostfile = NULL;
1.27 markus 718: options->system_hostfile2 = NULL;
719: options->user_hostfile2 = NULL;
1.17 markus 720: options->num_local_forwards = 0;
721: options->num_remote_forwards = 0;
722: options->log_level = (LogLevel) - 1;
1.1 deraadt 723: }
724:
1.19 markus 725: /*
726: * Called after processing other sources of option data, this fills those
727: * options for which no value has been specified with their default values.
728: */
1.1 deraadt 729:
1.26 markus 730: void
1.17 markus 731: fill_default_options(Options * options)
1.1 deraadt 732: {
1.49.2.1 jason 733: int len;
734:
1.17 markus 735: if (options->forward_agent == -1)
1.33 markus 736: options->forward_agent = 0;
1.17 markus 737: if (options->forward_x11 == -1)
1.23 markus 738: options->forward_x11 = 0;
1.34 markus 739: #ifdef XAUTH_PATH
740: if (options->xauth_location == NULL)
1.35 markus 741: options->xauth_location = XAUTH_PATH;
1.34 markus 742: #endif /* XAUTH_PATH */
1.17 markus 743: if (options->gateway_ports == -1)
744: options->gateway_ports = 0;
745: if (options->use_privileged_port == -1)
746: options->use_privileged_port = 1;
747: if (options->rhosts_authentication == -1)
748: options->rhosts_authentication = 1;
749: if (options->rsa_authentication == -1)
750: options->rsa_authentication = 1;
1.49.2.1 jason 751: if (options->pubkey_authentication == -1)
752: options->pubkey_authentication = 1;
753: if (options->challenge_reponse_authentication == -1)
754: options->challenge_reponse_authentication = 0;
1.1 deraadt 755: #ifdef KRB4
1.17 markus 756: if (options->kerberos_authentication == -1)
1.45 provos 757: options->kerberos_authentication = 1;
1.5 dugsong 758: #endif /* KRB4 */
759: #ifdef AFS
1.17 markus 760: if (options->kerberos_tgt_passing == -1)
761: options->kerberos_tgt_passing = 1;
762: if (options->afs_token_passing == -1)
763: options->afs_token_passing = 1;
1.5 dugsong 764: #endif /* AFS */
1.17 markus 765: if (options->password_authentication == -1)
766: options->password_authentication = 1;
1.48 markus 767: if (options->kbd_interactive_authentication == -1)
1.49.2.1 jason 768: options->kbd_interactive_authentication = 1;
1.17 markus 769: if (options->rhosts_rsa_authentication == -1)
770: options->rhosts_rsa_authentication = 1;
771: if (options->fallback_to_rsh == -1)
1.41 deraadt 772: options->fallback_to_rsh = 0;
1.17 markus 773: if (options->use_rsh == -1)
774: options->use_rsh = 0;
775: if (options->batch_mode == -1)
776: options->batch_mode = 0;
777: if (options->check_host_ip == -1)
778: options->check_host_ip = 1;
779: if (options->strict_host_key_checking == -1)
780: options->strict_host_key_checking = 2; /* 2 is default */
781: if (options->compression == -1)
782: options->compression = 0;
783: if (options->keepalives == -1)
784: options->keepalives = 1;
785: if (options->compression_level == -1)
786: options->compression_level = 6;
787: if (options->port == -1)
788: options->port = 0; /* Filled in ssh_connect. */
789: if (options->connection_attempts == -1)
790: options->connection_attempts = 4;
791: if (options->number_of_password_prompts == -1)
792: options->number_of_password_prompts = 3;
793: /* Selected in ssh_login(). */
794: if (options->cipher == -1)
795: options->cipher = SSH_CIPHER_NOT_SET;
1.31 markus 796: /* options->ciphers, default set in myproposals.h */
1.49.2.1 jason 797: /* options->macs, default set in myproposals.h */
1.25 markus 798: if (options->protocol == SSH_PROTO_UNKNOWN)
1.28 markus 799: options->protocol = SSH_PROTO_1|SSH_PROTO_2|SSH_PROTO_1_PREFERRED;
1.17 markus 800: if (options->num_identity_files == 0) {
1.49.2.1 jason 801: if (options->protocol & SSH_PROTO_1) {
802: len = 2 + strlen(_PATH_SSH_CLIENT_IDENTITY) + 1;
803: options->identity_files[options->num_identity_files] =
804: xmalloc(len);
805: snprintf(options->identity_files[options->num_identity_files++],
806: len, "~/%.100s", _PATH_SSH_CLIENT_IDENTITY);
807: }
808: if (options->protocol & SSH_PROTO_2) {
809: len = 2 + strlen(_PATH_SSH_CLIENT_ID_DSA) + 1;
810: options->identity_files[options->num_identity_files] =
811: xmalloc(len);
812: snprintf(options->identity_files[options->num_identity_files++],
813: len, "~/%.100s", _PATH_SSH_CLIENT_ID_DSA);
814: }
1.27 markus 815: }
1.17 markus 816: if (options->escape_char == -1)
817: options->escape_char = '~';
818: if (options->system_hostfile == NULL)
1.49.2.1 jason 819: options->system_hostfile = _PATH_SSH_SYSTEM_HOSTFILE;
1.17 markus 820: if (options->user_hostfile == NULL)
1.49.2.1 jason 821: options->user_hostfile = _PATH_SSH_USER_HOSTFILE;
1.27 markus 822: if (options->system_hostfile2 == NULL)
1.49.2.1 jason 823: options->system_hostfile2 = _PATH_SSH_SYSTEM_HOSTFILE2;
1.27 markus 824: if (options->user_hostfile2 == NULL)
1.49.2.1 jason 825: options->user_hostfile2 = _PATH_SSH_USER_HOSTFILE2;
1.17 markus 826: if (options->log_level == (LogLevel) - 1)
827: options->log_level = SYSLOG_LEVEL_INFO;
828: /* options->proxy_command should not be set by default */
829: /* options->user will be set in the main program if appropriate */
830: /* options->hostname will be set in the main program if appropriate */
1.49.2.1 jason 831: /* options->host_key_alias should not be set by default */
1.1 deraadt 832: }
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