Annotation of src/usr.bin/ssh/readconf.c, Revision 1.43
1.1 deraadt 1: /*
1.26 markus 2: *
1.18 deraadt 3: * readconf.c
1.26 markus 4: *
1.18 deraadt 5: * Author: Tatu Ylonen <ylo@cs.hut.fi>
1.26 markus 6: *
1.18 deraadt 7: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
8: * All rights reserved
1.26 markus 9: *
1.18 deraadt 10: * Created: Sat Apr 22 00:03:10 1995 ylo
1.26 markus 11: *
1.18 deraadt 12: * Functions for reading the configuration files.
1.26 markus 13: *
1.18 deraadt 14: */
1.1 deraadt 15:
16: #include "includes.h"
1.43 ! markus 17: RCSID("$OpenBSD: readconf.c,v 1.42 2000/07/13 22:53:21 provos Exp $");
1.1 deraadt 18:
19: #include "ssh.h"
20: #include "cipher.h"
21: #include "readconf.h"
1.24 markus 22: #include "match.h"
1.1 deraadt 23: #include "xmalloc.h"
1.25 markus 24: #include "compat.h"
1.1 deraadt 25:
26: /* Format of the configuration file:
27:
28: # Configuration data is parsed as follows:
29: # 1. command line options
30: # 2. user-specific file
31: # 3. system-wide file
32: # Any configuration value is only changed the first time it is set.
33: # Thus, host-specific definitions should be at the beginning of the
34: # configuration file, and defaults at the end.
35:
36: # Host-specific declarations. These may override anything above. A single
37: # host may match multiple declarations; these are processed in the order
38: # that they are given in.
39:
40: Host *.ngs.fi ngs.fi
41: FallBackToRsh no
42:
43: Host fake.com
44: HostName another.host.name.real.org
45: User blaah
46: Port 34289
47: ForwardX11 no
48: ForwardAgent no
49:
50: Host books.com
51: RemoteForward 9999 shadows.cs.hut.fi:9999
52: Cipher 3des
53:
54: Host fascist.blob.com
55: Port 23123
56: User tylonen
57: RhostsAuthentication no
58: PasswordAuthentication no
59:
60: Host puukko.hut.fi
61: User t35124p
62: ProxyCommand ssh-proxy %h %p
63:
64: Host *.fr
65: UseRsh yes
66:
67: Host *.su
68: Cipher none
69: PasswordAuthentication no
70:
71: # Defaults for various options
72: Host *
73: ForwardAgent no
74: ForwardX11 yes
75: RhostsAuthentication yes
76: PasswordAuthentication yes
77: RSAAuthentication yes
78: RhostsRSAAuthentication yes
79: FallBackToRsh no
80: UseRsh no
81: StrictHostKeyChecking yes
82: KeepAlives no
83: IdentityFile ~/.ssh/identity
84: Port 22
85: EscapeChar ~
86:
87: */
88:
89: /* Keyword tokens. */
90:
1.17 markus 91: typedef enum {
92: oBadOption,
93: oForwardAgent, oForwardX11, oGatewayPorts, oRhostsAuthentication,
94: oPasswordAuthentication, oRSAAuthentication, oFallBackToRsh, oUseRsh,
1.34 markus 95: oSkeyAuthentication, oXAuthLocation,
1.1 deraadt 96: #ifdef KRB4
1.17 markus 97: oKerberosAuthentication,
1.1 deraadt 98: #endif /* KRB4 */
99: #ifdef AFS
1.17 markus 100: oKerberosTgtPassing, oAFSTokenPassing,
1.1 deraadt 101: #endif
1.17 markus 102: oIdentityFile, oHostName, oPort, oCipher, oRemoteForward, oLocalForward,
103: oUser, oHost, oEscapeChar, oRhostsRSAAuthentication, oProxyCommand,
104: oGlobalKnownHostsFile, oUserKnownHostsFile, oConnectionAttempts,
105: oBatchMode, oCheckHostIP, oStrictHostKeyChecking, oCompression,
106: oCompressionLevel, oKeepAlives, oNumberOfPasswordPrompts, oTISAuthentication,
1.27 markus 107: oUsePrivilegedPort, oLogLevel, oCiphers, oProtocol, oIdentityFile2,
1.30 markus 108: oGlobalKnownHostsFile2, oUserKnownHostsFile2, oDSAAuthentication
1.1 deraadt 109: } OpCodes;
110:
111: /* Textual representations of the tokens. */
112:
1.17 markus 113: static struct {
114: const char *name;
115: OpCodes opcode;
116: } keywords[] = {
117: { "forwardagent", oForwardAgent },
118: { "forwardx11", oForwardX11 },
1.34 markus 119: { "xauthlocation", oXAuthLocation },
1.17 markus 120: { "gatewayports", oGatewayPorts },
121: { "useprivilegedport", oUsePrivilegedPort },
122: { "rhostsauthentication", oRhostsAuthentication },
123: { "passwordauthentication", oPasswordAuthentication },
124: { "rsaauthentication", oRSAAuthentication },
1.30 markus 125: { "dsaauthentication", oDSAAuthentication },
1.17 markus 126: { "skeyauthentication", oSkeyAuthentication },
1.1 deraadt 127: #ifdef KRB4
1.17 markus 128: { "kerberosauthentication", oKerberosAuthentication },
1.1 deraadt 129: #endif /* KRB4 */
1.5 dugsong 130: #ifdef AFS
1.17 markus 131: { "kerberostgtpassing", oKerberosTgtPassing },
132: { "afstokenpassing", oAFSTokenPassing },
1.1 deraadt 133: #endif
1.17 markus 134: { "fallbacktorsh", oFallBackToRsh },
135: { "usersh", oUseRsh },
136: { "identityfile", oIdentityFile },
1.27 markus 137: { "identityfile2", oIdentityFile2 },
1.17 markus 138: { "hostname", oHostName },
139: { "proxycommand", oProxyCommand },
140: { "port", oPort },
141: { "cipher", oCipher },
1.25 markus 142: { "ciphers", oCiphers },
143: { "protocol", oProtocol },
1.17 markus 144: { "remoteforward", oRemoteForward },
145: { "localforward", oLocalForward },
146: { "user", oUser },
147: { "host", oHost },
148: { "escapechar", oEscapeChar },
149: { "rhostsrsaauthentication", oRhostsRSAAuthentication },
150: { "globalknownhostsfile", oGlobalKnownHostsFile },
151: { "userknownhostsfile", oUserKnownHostsFile },
1.27 markus 152: { "globalknownhostsfile2", oGlobalKnownHostsFile2 },
153: { "userknownhostsfile2", oUserKnownHostsFile2 },
1.17 markus 154: { "connectionattempts", oConnectionAttempts },
155: { "batchmode", oBatchMode },
156: { "checkhostip", oCheckHostIP },
157: { "stricthostkeychecking", oStrictHostKeyChecking },
158: { "compression", oCompression },
159: { "compressionlevel", oCompressionLevel },
160: { "keepalive", oKeepAlives },
161: { "numberofpasswordprompts", oNumberOfPasswordPrompts },
162: { "tisauthentication", oTISAuthentication },
163: { "loglevel", oLogLevel },
164: { NULL, 0 }
1.13 markus 165: };
166:
1.19 markus 167: /*
168: * Adds a local TCP/IP port forward to options. Never returns if there is an
169: * error.
170: */
1.1 deraadt 171:
1.26 markus 172: void
1.22 markus 173: add_local_forward(Options *options, u_short port, const char *host,
174: u_short host_port)
1.1 deraadt 175: {
1.17 markus 176: Forward *fwd;
177: extern uid_t original_real_uid;
178: if (port < IPPORT_RESERVED && original_real_uid != 0)
179: fatal("Privileged ports can only be forwarded by root.\n");
180: if (options->num_local_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
181: fatal("Too many local forwards (max %d).", SSH_MAX_FORWARDS_PER_DIRECTION);
182: fwd = &options->local_forwards[options->num_local_forwards++];
183: fwd->port = port;
184: fwd->host = xstrdup(host);
185: fwd->host_port = host_port;
1.1 deraadt 186: }
187:
1.19 markus 188: /*
189: * Adds a remote TCP/IP port forward to options. Never returns if there is
190: * an error.
191: */
1.1 deraadt 192:
1.26 markus 193: void
1.22 markus 194: add_remote_forward(Options *options, u_short port, const char *host,
195: u_short host_port)
1.1 deraadt 196: {
1.17 markus 197: Forward *fwd;
198: if (options->num_remote_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
199: fatal("Too many remote forwards (max %d).",
200: SSH_MAX_FORWARDS_PER_DIRECTION);
201: fwd = &options->remote_forwards[options->num_remote_forwards++];
202: fwd->port = port;
203: fwd->host = xstrdup(host);
204: fwd->host_port = host_port;
1.1 deraadt 205: }
206:
1.19 markus 207: /*
208: * Returns the number of the token pointed to by cp of length len. Never
209: * returns if the token is not known.
210: */
1.1 deraadt 211:
1.26 markus 212: static OpCodes
1.17 markus 213: parse_token(const char *cp, const char *filename, int linenum)
1.1 deraadt 214: {
1.17 markus 215: unsigned int i;
1.1 deraadt 216:
1.17 markus 217: for (i = 0; keywords[i].name; i++)
1.20 markus 218: if (strcasecmp(cp, keywords[i].name) == 0)
1.17 markus 219: return keywords[i].opcode;
220:
221: fprintf(stderr, "%s: line %d: Bad configuration option: %s\n",
222: filename, linenum, cp);
223: return oBadOption;
1.1 deraadt 224: }
225:
1.19 markus 226: /*
227: * Processes a single option line as used in the configuration files. This
228: * only sets those values that have not already been set.
229: */
1.1 deraadt 230:
1.14 markus 231: int
232: process_config_line(Options *options, const char *host,
1.17 markus 233: char *line, const char *filename, int linenum,
234: int *activep)
1.1 deraadt 235: {
1.38 provos 236: char buf[256], *s, *string, **charptr, *endofnumber, *keyword, *arg;
1.22 markus 237: int opcode, *intptr, value;
238: u_short fwd_port, fwd_host_port;
1.1 deraadt 239:
1.42 provos 240: s = line;
241: /* Get the keyword. (Each line is supposed to begin with a keyword). */
242: keyword = strdelim(&s);
243: /* Ignore leading whitespace. */
244: if (*keyword == '\0')
1.43 ! markus 245: keyword = strdelim(&s);
1.42 provos 246: if (!*keyword || *keyword == '\n' || *keyword == '#')
1.17 markus 247: return 0;
248:
1.38 provos 249: opcode = parse_token(keyword, filename, linenum);
1.17 markus 250:
251: switch (opcode) {
252: case oBadOption:
1.19 markus 253: /* don't panic, but count bad options */
254: return -1;
1.17 markus 255: /* NOTREACHED */
256: case oForwardAgent:
257: intptr = &options->forward_agent;
258: parse_flag:
1.42 provos 259: arg = strdelim(&s);
1.40 ho 260: if (!arg || *arg == '\0')
1.17 markus 261: fatal("%.200s line %d: Missing yes/no argument.", filename, linenum);
262: value = 0; /* To avoid compiler warning... */
1.38 provos 263: if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
1.17 markus 264: value = 1;
1.38 provos 265: else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
1.17 markus 266: value = 0;
267: else
268: fatal("%.200s line %d: Bad yes/no argument.", filename, linenum);
269: if (*activep && *intptr == -1)
270: *intptr = value;
271: break;
272:
273: case oForwardX11:
274: intptr = &options->forward_x11;
275: goto parse_flag;
276:
277: case oGatewayPorts:
278: intptr = &options->gateway_ports;
279: goto parse_flag;
280:
281: case oUsePrivilegedPort:
282: intptr = &options->use_privileged_port;
283: goto parse_flag;
284:
285: case oRhostsAuthentication:
286: intptr = &options->rhosts_authentication;
287: goto parse_flag;
288:
289: case oPasswordAuthentication:
290: intptr = &options->password_authentication;
291: goto parse_flag;
292:
1.30 markus 293: case oDSAAuthentication:
294: intptr = &options->dsa_authentication;
295: goto parse_flag;
296:
1.17 markus 297: case oRSAAuthentication:
298: intptr = &options->rsa_authentication;
299: goto parse_flag;
300:
301: case oRhostsRSAAuthentication:
302: intptr = &options->rhosts_rsa_authentication;
303: goto parse_flag;
304:
305: case oTISAuthentication:
306: /* fallthrough, there is no difference on the client side */
307: case oSkeyAuthentication:
308: intptr = &options->skey_authentication;
309: goto parse_flag;
1.16 markus 310:
1.1 deraadt 311: #ifdef KRB4
1.17 markus 312: case oKerberosAuthentication:
313: intptr = &options->kerberos_authentication;
314: goto parse_flag;
1.1 deraadt 315: #endif /* KRB4 */
316:
1.5 dugsong 317: #ifdef AFS
1.17 markus 318: case oKerberosTgtPassing:
319: intptr = &options->kerberos_tgt_passing;
320: goto parse_flag;
321:
322: case oAFSTokenPassing:
323: intptr = &options->afs_token_passing;
324: goto parse_flag;
1.1 deraadt 325: #endif
1.17 markus 326:
327: case oFallBackToRsh:
328: intptr = &options->fallback_to_rsh;
329: goto parse_flag;
330:
331: case oUseRsh:
332: intptr = &options->use_rsh;
333: goto parse_flag;
334:
335: case oBatchMode:
336: intptr = &options->batch_mode;
337: goto parse_flag;
338:
339: case oCheckHostIP:
340: intptr = &options->check_host_ip;
341: goto parse_flag;
342:
343: case oStrictHostKeyChecking:
344: intptr = &options->strict_host_key_checking;
1.42 provos 345: arg = strdelim(&s);
1.40 ho 346: if (!arg || *arg == '\0')
1.17 markus 347: fatal("%.200s line %d: Missing yes/no argument.",
348: filename, linenum);
349: value = 0; /* To avoid compiler warning... */
1.38 provos 350: if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
1.17 markus 351: value = 1;
1.38 provos 352: else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
1.17 markus 353: value = 0;
1.38 provos 354: else if (strcmp(arg, "ask") == 0)
1.17 markus 355: value = 2;
356: else
357: fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum);
358: if (*activep && *intptr == -1)
359: *intptr = value;
360: break;
361:
362: case oCompression:
363: intptr = &options->compression;
364: goto parse_flag;
365:
366: case oKeepAlives:
367: intptr = &options->keepalives;
368: goto parse_flag;
369:
370: case oNumberOfPasswordPrompts:
371: intptr = &options->number_of_password_prompts;
372: goto parse_int;
373:
374: case oCompressionLevel:
375: intptr = &options->compression_level;
376: goto parse_int;
377:
378: case oIdentityFile:
1.27 markus 379: case oIdentityFile2:
1.42 provos 380: arg = strdelim(&s);
1.40 ho 381: if (!arg || *arg == '\0')
1.17 markus 382: fatal("%.200s line %d: Missing argument.", filename, linenum);
383: if (*activep) {
1.27 markus 384: intptr = (opcode == oIdentityFile) ?
385: &options->num_identity_files :
386: &options->num_identity_files2;
387: if (*intptr >= SSH_MAX_IDENTITY_FILES)
1.17 markus 388: fatal("%.200s line %d: Too many identity files specified (max %d).",
389: filename, linenum, SSH_MAX_IDENTITY_FILES);
1.27 markus 390: charptr = (opcode == oIdentityFile) ?
391: &options->identity_files[*intptr] :
392: &options->identity_files2[*intptr];
1.38 provos 393: *charptr = xstrdup(arg);
1.27 markus 394: *intptr = *intptr + 1;
1.17 markus 395: }
396: break;
397:
1.34 markus 398: case oXAuthLocation:
399: charptr=&options->xauth_location;
400: goto parse_string;
401:
1.17 markus 402: case oUser:
403: charptr = &options->user;
404: parse_string:
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 && *charptr == NULL)
1.38 provos 409: *charptr = xstrdup(arg);
1.17 markus 410: break;
411:
412: case oGlobalKnownHostsFile:
413: charptr = &options->system_hostfile;
414: goto parse_string;
415:
416: case oUserKnownHostsFile:
417: charptr = &options->user_hostfile;
418: goto parse_string;
419:
1.27 markus 420: case oGlobalKnownHostsFile2:
421: charptr = &options->system_hostfile2;
422: goto parse_string;
423:
424: case oUserKnownHostsFile2:
425: charptr = &options->user_hostfile2;
426: goto parse_string;
427:
1.17 markus 428: case oHostName:
429: charptr = &options->hostname;
430: goto parse_string;
431:
432: case oProxyCommand:
433: charptr = &options->proxy_command;
434: string = xstrdup("");
1.42 provos 435: while ((arg = strdelim(&s)) != NULL && *arg != '\0') {
1.38 provos 436: string = xrealloc(string, strlen(string) + strlen(arg) + 2);
1.17 markus 437: strcat(string, " ");
1.38 provos 438: strcat(string, arg);
1.17 markus 439: }
440: if (*activep && *charptr == NULL)
441: *charptr = string;
442: else
443: xfree(string);
444: return 0;
445:
446: case oPort:
447: intptr = &options->port;
448: parse_int:
1.42 provos 449: arg = strdelim(&s);
1.40 ho 450: if (!arg || *arg == '\0')
1.17 markus 451: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 452: if (arg[0] < '0' || arg[0] > '9')
1.17 markus 453: fatal("%.200s line %d: Bad number.", filename, linenum);
1.21 markus 454:
455: /* Octal, decimal, or hex format? */
1.38 provos 456: value = strtol(arg, &endofnumber, 0);
457: if (arg == endofnumber)
1.21 markus 458: fatal("%.200s line %d: Bad number.", filename, linenum);
1.17 markus 459: if (*activep && *intptr == -1)
460: *intptr = value;
461: break;
462:
463: case oConnectionAttempts:
464: intptr = &options->connection_attempts;
465: goto parse_int;
466:
467: case oCipher:
468: intptr = &options->cipher;
1.42 provos 469: arg = strdelim(&s);
1.40 ho 470: if (!arg || *arg == '\0')
1.32 markus 471: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 472: value = cipher_number(arg);
1.17 markus 473: if (value == -1)
474: fatal("%.200s line %d: Bad cipher '%s'.",
1.38 provos 475: filename, linenum, arg ? arg : "<NONE>");
1.17 markus 476: if (*activep && *intptr == -1)
477: *intptr = value;
478: break;
479:
1.25 markus 480: case oCiphers:
1.42 provos 481: arg = strdelim(&s);
1.40 ho 482: if (!arg || *arg == '\0')
1.32 markus 483: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 484: if (!ciphers_valid(arg))
1.31 markus 485: fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.",
1.38 provos 486: filename, linenum, arg ? arg : "<NONE>");
1.25 markus 487: if (*activep && options->ciphers == NULL)
1.38 provos 488: options->ciphers = xstrdup(arg);
1.25 markus 489: break;
490:
491: case oProtocol:
492: intptr = &options->protocol;
1.42 provos 493: arg = strdelim(&s);
1.40 ho 494: if (!arg || *arg == '\0')
1.32 markus 495: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 496: value = proto_spec(arg);
1.25 markus 497: if (value == SSH_PROTO_UNKNOWN)
498: fatal("%.200s line %d: Bad protocol spec '%s'.",
1.38 provos 499: filename, linenum, arg ? arg : "<NONE>");
1.25 markus 500: if (*activep && *intptr == SSH_PROTO_UNKNOWN)
501: *intptr = value;
502: break;
503:
1.17 markus 504: case oLogLevel:
505: intptr = (int *) &options->log_level;
1.42 provos 506: arg = strdelim(&s);
1.38 provos 507: value = log_level_number(arg);
1.17 markus 508: if (value == (LogLevel) - 1)
509: fatal("%.200s line %d: unsupported log level '%s'\n",
1.38 provos 510: filename, linenum, arg ? arg : "<NONE>");
1.17 markus 511: if (*activep && (LogLevel) * intptr == -1)
512: *intptr = (LogLevel) value;
513: break;
514:
515: case oRemoteForward:
1.42 provos 516: arg = strdelim(&s);
1.40 ho 517: if (!arg || *arg == '\0')
1.17 markus 518: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 519: if (arg[0] < '0' || arg[0] > '9')
1.17 markus 520: fatal("%.200s line %d: Badly formatted port number.",
521: filename, linenum);
1.38 provos 522: fwd_port = atoi(arg);
1.42 provos 523: arg = strdelim(&s);
1.40 ho 524: if (!arg || *arg == '\0')
1.17 markus 525: fatal("%.200s line %d: Missing second argument.",
526: filename, linenum);
1.38 provos 527: if (sscanf(arg, "%255[^:]:%hu", buf, &fwd_host_port) != 2)
1.17 markus 528: fatal("%.200s line %d: Badly formatted host:port.",
529: filename, linenum);
530: if (*activep)
531: add_remote_forward(options, fwd_port, buf, fwd_host_port);
532: break;
533:
534: case oLocalForward:
1.42 provos 535: arg = strdelim(&s);
1.40 ho 536: if (!arg || *arg == '\0')
1.17 markus 537: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 538: if (arg[0] < '0' || arg[0] > '9')
1.17 markus 539: fatal("%.200s line %d: Badly formatted port number.",
540: filename, linenum);
1.38 provos 541: fwd_port = atoi(arg);
1.42 provos 542: arg = strdelim(&s);
1.40 ho 543: if (!arg || *arg == '\0')
1.17 markus 544: fatal("%.200s line %d: Missing second argument.",
545: filename, linenum);
1.38 provos 546: if (sscanf(arg, "%255[^:]:%hu", buf, &fwd_host_port) != 2)
1.17 markus 547: fatal("%.200s line %d: Badly formatted host:port.",
548: filename, linenum);
549: if (*activep)
550: add_local_forward(options, fwd_port, buf, fwd_host_port);
551: break;
552:
553: case oHost:
554: *activep = 0;
1.42 provos 555: while ((arg = strdelim(&s)) != NULL && *arg != '\0')
1.38 provos 556: if (match_pattern(host, arg)) {
557: debug("Applying options for %.100s", arg);
1.17 markus 558: *activep = 1;
559: break;
560: }
1.42 provos 561: /* Avoid garbage check below, as strdelim is done. */
1.17 markus 562: return 0;
563:
564: case oEscapeChar:
565: intptr = &options->escape_char;
1.42 provos 566: arg = strdelim(&s);
1.40 ho 567: if (!arg || *arg == '\0')
1.17 markus 568: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 569: if (arg[0] == '^' && arg[2] == 0 &&
570: (unsigned char) arg[1] >= 64 && (unsigned char) arg[1] < 128)
571: value = (unsigned char) arg[1] & 31;
572: else if (strlen(arg) == 1)
573: value = (unsigned char) arg[0];
574: else if (strcmp(arg, "none") == 0)
1.17 markus 575: value = -2;
576: else {
577: fatal("%.200s line %d: Bad escape character.",
578: filename, linenum);
579: /* NOTREACHED */
580: value = 0; /* Avoid compiler warning. */
581: }
582: if (*activep && *intptr == -1)
583: *intptr = value;
584: break;
585:
586: default:
587: fatal("process_config_line: Unimplemented opcode %d", opcode);
588: }
589:
590: /* Check that there is no garbage at end of line. */
1.42 provos 591: if ((arg = strdelim(&s)) != NULL && *arg != '\0')
1.39 ho 592: {
593: fatal("%.200s line %d: garbage at end of line; \"%.200s\".",
594: filename, linenum, arg);
595: }
1.17 markus 596: return 0;
1.1 deraadt 597: }
598:
599:
1.19 markus 600: /*
601: * Reads the config file and modifies the options accordingly. Options
602: * should already be initialized before this call. This never returns if
603: * there is an error. If the file does not exist, this returns immediately.
604: */
1.1 deraadt 605:
1.26 markus 606: void
1.17 markus 607: read_config_file(const char *filename, const char *host, Options *options)
1.1 deraadt 608: {
1.17 markus 609: FILE *f;
610: char line[1024];
611: int active, linenum;
612: int bad_options = 0;
613:
614: /* Open the file. */
615: f = fopen(filename, "r");
616: if (!f)
617: return;
618:
619: debug("Reading configuration data %.200s", filename);
620:
1.19 markus 621: /*
622: * Mark that we are now processing the options. This flag is turned
623: * on/off by Host specifications.
624: */
1.17 markus 625: active = 1;
626: linenum = 0;
627: while (fgets(line, sizeof(line), f)) {
628: /* Update line number counter. */
629: linenum++;
630: if (process_config_line(options, host, line, filename, linenum, &active) != 0)
631: bad_options++;
632: }
633: fclose(f);
634: if (bad_options > 0)
635: fatal("%s: terminating, %d bad configuration options\n",
636: filename, bad_options);
1.1 deraadt 637: }
638:
1.19 markus 639: /*
640: * Initializes options to special values that indicate that they have not yet
641: * been set. Read_config_file will only set options with this value. Options
642: * are processed in the following order: command line, user config file,
643: * system config file. Last, fill_default_options is called.
644: */
1.1 deraadt 645:
1.26 markus 646: void
1.17 markus 647: initialize_options(Options * options)
1.1 deraadt 648: {
1.17 markus 649: memset(options, 'X', sizeof(*options));
650: options->forward_agent = -1;
651: options->forward_x11 = -1;
1.34 markus 652: options->xauth_location = NULL;
1.17 markus 653: options->gateway_ports = -1;
654: options->use_privileged_port = -1;
655: options->rhosts_authentication = -1;
656: options->rsa_authentication = -1;
1.30 markus 657: options->dsa_authentication = -1;
1.17 markus 658: options->skey_authentication = -1;
1.1 deraadt 659: #ifdef KRB4
1.17 markus 660: options->kerberos_authentication = -1;
1.1 deraadt 661: #endif
1.5 dugsong 662: #ifdef AFS
1.17 markus 663: options->kerberos_tgt_passing = -1;
664: options->afs_token_passing = -1;
1.1 deraadt 665: #endif
1.17 markus 666: options->password_authentication = -1;
667: options->rhosts_rsa_authentication = -1;
668: options->fallback_to_rsh = -1;
669: options->use_rsh = -1;
670: options->batch_mode = -1;
671: options->check_host_ip = -1;
672: options->strict_host_key_checking = -1;
673: options->compression = -1;
674: options->keepalives = -1;
675: options->compression_level = -1;
676: options->port = -1;
677: options->connection_attempts = -1;
678: options->number_of_password_prompts = -1;
679: options->cipher = -1;
1.25 markus 680: options->ciphers = NULL;
681: options->protocol = SSH_PROTO_UNKNOWN;
1.17 markus 682: options->num_identity_files = 0;
1.27 markus 683: options->num_identity_files2 = 0;
1.17 markus 684: options->hostname = NULL;
685: options->proxy_command = NULL;
686: options->user = NULL;
687: options->escape_char = -1;
688: options->system_hostfile = NULL;
689: options->user_hostfile = NULL;
1.27 markus 690: options->system_hostfile2 = NULL;
691: options->user_hostfile2 = NULL;
1.17 markus 692: options->num_local_forwards = 0;
693: options->num_remote_forwards = 0;
694: options->log_level = (LogLevel) - 1;
1.1 deraadt 695: }
696:
1.19 markus 697: /*
698: * Called after processing other sources of option data, this fills those
699: * options for which no value has been specified with their default values.
700: */
1.1 deraadt 701:
1.26 markus 702: void
1.17 markus 703: fill_default_options(Options * options)
1.1 deraadt 704: {
1.17 markus 705: if (options->forward_agent == -1)
1.33 markus 706: options->forward_agent = 0;
1.17 markus 707: if (options->forward_x11 == -1)
1.23 markus 708: options->forward_x11 = 0;
1.34 markus 709: #ifdef XAUTH_PATH
710: if (options->xauth_location == NULL)
1.35 markus 711: options->xauth_location = XAUTH_PATH;
1.34 markus 712: #endif /* XAUTH_PATH */
1.17 markus 713: if (options->gateway_ports == -1)
714: options->gateway_ports = 0;
715: if (options->use_privileged_port == -1)
716: options->use_privileged_port = 1;
717: if (options->rhosts_authentication == -1)
718: options->rhosts_authentication = 1;
719: if (options->rsa_authentication == -1)
720: options->rsa_authentication = 1;
1.30 markus 721: if (options->dsa_authentication == -1)
722: options->dsa_authentication = 1;
1.17 markus 723: if (options->skey_authentication == -1)
724: options->skey_authentication = 0;
1.1 deraadt 725: #ifdef KRB4
1.17 markus 726: if (options->kerberos_authentication == -1)
727: options->kerberos_authentication = 1;
1.5 dugsong 728: #endif /* KRB4 */
729: #ifdef AFS
1.17 markus 730: if (options->kerberos_tgt_passing == -1)
731: options->kerberos_tgt_passing = 1;
732: if (options->afs_token_passing == -1)
733: options->afs_token_passing = 1;
1.5 dugsong 734: #endif /* AFS */
1.17 markus 735: if (options->password_authentication == -1)
736: options->password_authentication = 1;
737: if (options->rhosts_rsa_authentication == -1)
738: options->rhosts_rsa_authentication = 1;
739: if (options->fallback_to_rsh == -1)
1.41 deraadt 740: options->fallback_to_rsh = 0;
1.17 markus 741: if (options->use_rsh == -1)
742: options->use_rsh = 0;
743: if (options->batch_mode == -1)
744: options->batch_mode = 0;
745: if (options->check_host_ip == -1)
746: options->check_host_ip = 1;
747: if (options->strict_host_key_checking == -1)
748: options->strict_host_key_checking = 2; /* 2 is default */
749: if (options->compression == -1)
750: options->compression = 0;
751: if (options->keepalives == -1)
752: options->keepalives = 1;
753: if (options->compression_level == -1)
754: options->compression_level = 6;
755: if (options->port == -1)
756: options->port = 0; /* Filled in ssh_connect. */
757: if (options->connection_attempts == -1)
758: options->connection_attempts = 4;
759: if (options->number_of_password_prompts == -1)
760: options->number_of_password_prompts = 3;
761: /* Selected in ssh_login(). */
762: if (options->cipher == -1)
763: options->cipher = SSH_CIPHER_NOT_SET;
1.31 markus 764: /* options->ciphers, default set in myproposals.h */
1.25 markus 765: if (options->protocol == SSH_PROTO_UNKNOWN)
1.28 markus 766: options->protocol = SSH_PROTO_1|SSH_PROTO_2|SSH_PROTO_1_PREFERRED;
1.17 markus 767: if (options->num_identity_files == 0) {
768: options->identity_files[0] =
769: xmalloc(2 + strlen(SSH_CLIENT_IDENTITY) + 1);
770: sprintf(options->identity_files[0], "~/%.100s", SSH_CLIENT_IDENTITY);
771: options->num_identity_files = 1;
772: }
1.27 markus 773: if (options->num_identity_files2 == 0) {
774: options->identity_files2[0] =
1.29 markus 775: xmalloc(2 + strlen(SSH_CLIENT_ID_DSA) + 1);
776: sprintf(options->identity_files2[0], "~/%.100s", SSH_CLIENT_ID_DSA);
1.27 markus 777: options->num_identity_files2 = 1;
778: }
1.17 markus 779: if (options->escape_char == -1)
780: options->escape_char = '~';
781: if (options->system_hostfile == NULL)
782: options->system_hostfile = SSH_SYSTEM_HOSTFILE;
783: if (options->user_hostfile == NULL)
784: options->user_hostfile = SSH_USER_HOSTFILE;
1.27 markus 785: if (options->system_hostfile2 == NULL)
786: options->system_hostfile2 = SSH_SYSTEM_HOSTFILE2;
787: if (options->user_hostfile2 == NULL)
788: options->user_hostfile2 = SSH_USER_HOSTFILE2;
1.17 markus 789: if (options->log_level == (LogLevel) - 1)
790: options->log_level = SYSLOG_LEVEL_INFO;
791: /* options->proxy_command should not be set by default */
792: /* options->user will be set in the main program if appropriate */
793: /* options->hostname will be set in the main program if appropriate */
1.1 deraadt 794: }