Annotation of src/usr.bin/ssh/readconf.c, Revision 1.59
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"
1.59 ! markus 15: RCSID("$OpenBSD: readconf.c,v 1.58 2001/01/21 19:05:53 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"
1.1 deraadt 26:
27: /* Format of the configuration file:
28:
29: # Configuration data is parsed as follows:
30: # 1. command line options
31: # 2. user-specific file
32: # 3. system-wide file
33: # Any configuration value is only changed the first time it is set.
34: # Thus, host-specific definitions should be at the beginning of the
35: # configuration file, and defaults at the end.
36:
37: # Host-specific declarations. These may override anything above. A single
38: # host may match multiple declarations; these are processed in the order
39: # that they are given in.
40:
41: Host *.ngs.fi ngs.fi
42: FallBackToRsh no
43:
44: Host fake.com
45: HostName another.host.name.real.org
46: User blaah
47: Port 34289
48: ForwardX11 no
49: ForwardAgent no
50:
51: Host books.com
52: RemoteForward 9999 shadows.cs.hut.fi:9999
53: Cipher 3des
54:
55: Host fascist.blob.com
56: Port 23123
57: User tylonen
58: RhostsAuthentication no
59: PasswordAuthentication no
60:
61: Host puukko.hut.fi
62: User t35124p
63: ProxyCommand ssh-proxy %h %p
64:
65: Host *.fr
66: UseRsh yes
67:
68: Host *.su
69: Cipher none
70: PasswordAuthentication no
71:
72: # Defaults for various options
73: Host *
74: ForwardAgent no
1.50 markus 75: ForwardX11 no
1.1 deraadt 76: RhostsAuthentication yes
77: PasswordAuthentication yes
78: RSAAuthentication yes
79: RhostsRSAAuthentication yes
80: FallBackToRsh no
81: UseRsh no
82: StrictHostKeyChecking yes
83: KeepAlives no
84: IdentityFile ~/.ssh/identity
85: Port 22
86: EscapeChar ~
87:
88: */
89:
90: /* Keyword tokens. */
91:
1.17 markus 92: typedef enum {
93: oBadOption,
94: oForwardAgent, oForwardX11, oGatewayPorts, oRhostsAuthentication,
95: oPasswordAuthentication, oRSAAuthentication, oFallBackToRsh, oUseRsh,
1.59 ! markus 96: oChallengeResponseAuthentication, oXAuthLocation,
1.1 deraadt 97: #ifdef KRB4
1.17 markus 98: oKerberosAuthentication,
1.1 deraadt 99: #endif /* KRB4 */
100: #ifdef AFS
1.17 markus 101: oKerberosTgtPassing, oAFSTokenPassing,
1.1 deraadt 102: #endif
1.17 markus 103: oIdentityFile, oHostName, oPort, oCipher, oRemoteForward, oLocalForward,
104: oUser, oHost, oEscapeChar, oRhostsRSAAuthentication, oProxyCommand,
105: oGlobalKnownHostsFile, oUserKnownHostsFile, oConnectionAttempts,
106: oBatchMode, oCheckHostIP, oStrictHostKeyChecking, oCompression,
1.59 ! markus 107: oCompressionLevel, oKeepAlives, oNumberOfPasswordPrompts,
1.50 markus 108: oUsePrivilegedPort, oLogLevel, oCiphers, oProtocol,
109: oGlobalKnownHostsFile2, oUserKnownHostsFile2, oPubkeyAuthentication,
1.52 markus 110: oKbdInteractiveAuthentication, oKbdInteractiveDevices, oHostKeyAlias
1.1 deraadt 111: } OpCodes;
112:
113: /* Textual representations of the tokens. */
114:
1.17 markus 115: static struct {
116: const char *name;
117: OpCodes opcode;
118: } keywords[] = {
119: { "forwardagent", oForwardAgent },
120: { "forwardx11", oForwardX11 },
1.34 markus 121: { "xauthlocation", oXAuthLocation },
1.17 markus 122: { "gatewayports", oGatewayPorts },
123: { "useprivilegedport", oUsePrivilegedPort },
124: { "rhostsauthentication", oRhostsAuthentication },
125: { "passwordauthentication", oPasswordAuthentication },
1.48 markus 126: { "kbdinteractiveauthentication", oKbdInteractiveAuthentication },
127: { "kbdinteractivedevices", oKbdInteractiveDevices },
1.17 markus 128: { "rsaauthentication", oRSAAuthentication },
1.50 markus 129: { "pubkeyauthentication", oPubkeyAuthentication },
1.59 ! markus 130: { "dsaauthentication", oPubkeyAuthentication }, /* alias */
! 131: { "challengeresponseauthentication", oChallengeResponseAuthentication },
! 132: { "skeyauthentication", oChallengeResponseAuthentication }, /* alias */
! 133: { "tisauthentication", oChallengeResponseAuthentication }, /* alias */
1.1 deraadt 134: #ifdef KRB4
1.17 markus 135: { "kerberosauthentication", oKerberosAuthentication },
1.1 deraadt 136: #endif /* KRB4 */
1.5 dugsong 137: #ifdef AFS
1.17 markus 138: { "kerberostgtpassing", oKerberosTgtPassing },
139: { "afstokenpassing", oAFSTokenPassing },
1.1 deraadt 140: #endif
1.17 markus 141: { "fallbacktorsh", oFallBackToRsh },
142: { "usersh", oUseRsh },
143: { "identityfile", oIdentityFile },
1.50 markus 144: { "identityfile2", oIdentityFile }, /* alias */
1.17 markus 145: { "hostname", oHostName },
1.52 markus 146: { "hostkeyalias", oHostKeyAlias },
1.17 markus 147: { "proxycommand", oProxyCommand },
148: { "port", oPort },
149: { "cipher", oCipher },
1.25 markus 150: { "ciphers", oCiphers },
151: { "protocol", oProtocol },
1.17 markus 152: { "remoteforward", oRemoteForward },
153: { "localforward", oLocalForward },
154: { "user", oUser },
155: { "host", oHost },
156: { "escapechar", oEscapeChar },
157: { "rhostsrsaauthentication", oRhostsRSAAuthentication },
158: { "globalknownhostsfile", oGlobalKnownHostsFile },
159: { "userknownhostsfile", oUserKnownHostsFile },
1.27 markus 160: { "globalknownhostsfile2", oGlobalKnownHostsFile2 },
161: { "userknownhostsfile2", oUserKnownHostsFile2 },
1.17 markus 162: { "connectionattempts", oConnectionAttempts },
163: { "batchmode", oBatchMode },
164: { "checkhostip", oCheckHostIP },
165: { "stricthostkeychecking", oStrictHostKeyChecking },
166: { "compression", oCompression },
167: { "compressionlevel", oCompressionLevel },
168: { "keepalive", oKeepAlives },
169: { "numberofpasswordprompts", oNumberOfPasswordPrompts },
170: { "loglevel", oLogLevel },
171: { NULL, 0 }
1.13 markus 172: };
173:
1.19 markus 174: /*
175: * Adds a local TCP/IP port forward to options. Never returns if there is an
176: * error.
177: */
1.1 deraadt 178:
1.26 markus 179: void
1.22 markus 180: add_local_forward(Options *options, u_short port, const char *host,
181: u_short host_port)
1.1 deraadt 182: {
1.17 markus 183: Forward *fwd;
184: extern uid_t original_real_uid;
185: if (port < IPPORT_RESERVED && original_real_uid != 0)
186: fatal("Privileged ports can only be forwarded by root.\n");
187: if (options->num_local_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
188: fatal("Too many local forwards (max %d).", SSH_MAX_FORWARDS_PER_DIRECTION);
189: fwd = &options->local_forwards[options->num_local_forwards++];
190: fwd->port = port;
191: fwd->host = xstrdup(host);
192: fwd->host_port = host_port;
1.1 deraadt 193: }
194:
1.19 markus 195: /*
196: * Adds a remote TCP/IP port forward to options. Never returns if there is
197: * an error.
198: */
1.1 deraadt 199:
1.26 markus 200: void
1.22 markus 201: add_remote_forward(Options *options, u_short port, const char *host,
202: u_short host_port)
1.1 deraadt 203: {
1.17 markus 204: Forward *fwd;
205: if (options->num_remote_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
206: fatal("Too many remote forwards (max %d).",
207: SSH_MAX_FORWARDS_PER_DIRECTION);
208: fwd = &options->remote_forwards[options->num_remote_forwards++];
209: fwd->port = port;
210: fwd->host = xstrdup(host);
211: fwd->host_port = host_port;
1.1 deraadt 212: }
213:
1.19 markus 214: /*
215: * Returns the number of the token pointed to by cp of length len. Never
216: * returns if the token is not known.
217: */
1.1 deraadt 218:
1.26 markus 219: static OpCodes
1.17 markus 220: parse_token(const char *cp, const char *filename, int linenum)
1.1 deraadt 221: {
1.51 markus 222: u_int i;
1.1 deraadt 223:
1.17 markus 224: for (i = 0; keywords[i].name; i++)
1.20 markus 225: if (strcasecmp(cp, keywords[i].name) == 0)
1.17 markus 226: return keywords[i].opcode;
227:
228: fprintf(stderr, "%s: line %d: Bad configuration option: %s\n",
229: filename, linenum, cp);
230: return oBadOption;
1.1 deraadt 231: }
232:
1.19 markus 233: /*
234: * Processes a single option line as used in the configuration files. This
235: * only sets those values that have not already been set.
236: */
1.1 deraadt 237:
1.14 markus 238: int
239: process_config_line(Options *options, const char *host,
1.17 markus 240: char *line, const char *filename, int linenum,
241: int *activep)
1.1 deraadt 242: {
1.38 provos 243: char buf[256], *s, *string, **charptr, *endofnumber, *keyword, *arg;
1.22 markus 244: int opcode, *intptr, value;
245: u_short fwd_port, fwd_host_port;
1.1 deraadt 246:
1.42 provos 247: s = line;
248: /* Get the keyword. (Each line is supposed to begin with a keyword). */
249: keyword = strdelim(&s);
250: /* Ignore leading whitespace. */
251: if (*keyword == '\0')
1.43 markus 252: keyword = strdelim(&s);
1.56 deraadt 253: if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#')
1.17 markus 254: return 0;
255:
1.38 provos 256: opcode = parse_token(keyword, filename, linenum);
1.17 markus 257:
258: switch (opcode) {
259: case oBadOption:
1.19 markus 260: /* don't panic, but count bad options */
261: return -1;
1.17 markus 262: /* NOTREACHED */
263: case oForwardAgent:
264: intptr = &options->forward_agent;
265: parse_flag:
1.42 provos 266: arg = strdelim(&s);
1.40 ho 267: if (!arg || *arg == '\0')
1.17 markus 268: fatal("%.200s line %d: Missing yes/no argument.", filename, linenum);
269: value = 0; /* To avoid compiler warning... */
1.38 provos 270: if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
1.17 markus 271: value = 1;
1.38 provos 272: else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
1.17 markus 273: value = 0;
274: else
275: fatal("%.200s line %d: Bad yes/no argument.", filename, linenum);
276: if (*activep && *intptr == -1)
277: *intptr = value;
278: break;
279:
280: case oForwardX11:
281: intptr = &options->forward_x11;
282: goto parse_flag;
283:
284: case oGatewayPorts:
285: intptr = &options->gateway_ports;
286: goto parse_flag;
287:
288: case oUsePrivilegedPort:
289: intptr = &options->use_privileged_port;
290: goto parse_flag;
291:
292: case oRhostsAuthentication:
293: intptr = &options->rhosts_authentication;
294: goto parse_flag;
295:
296: case oPasswordAuthentication:
297: intptr = &options->password_authentication;
298: goto parse_flag;
299:
1.48 markus 300: case oKbdInteractiveAuthentication:
301: intptr = &options->kbd_interactive_authentication;
302: goto parse_flag;
303:
304: case oKbdInteractiveDevices:
305: charptr = &options->kbd_interactive_devices;
306: goto parse_string;
307:
1.50 markus 308: case oPubkeyAuthentication:
309: intptr = &options->pubkey_authentication;
1.30 markus 310: goto parse_flag;
311:
1.17 markus 312: case oRSAAuthentication:
313: intptr = &options->rsa_authentication;
314: goto parse_flag;
315:
316: case oRhostsRSAAuthentication:
317: intptr = &options->rhosts_rsa_authentication;
318: goto parse_flag;
319:
1.59 ! markus 320: case oChallengeResponseAuthentication:
! 321: intptr = &options->challenge_reponse_authentication;
1.17 markus 322: goto parse_flag;
1.16 markus 323:
1.1 deraadt 324: #ifdef KRB4
1.17 markus 325: case oKerberosAuthentication:
326: intptr = &options->kerberos_authentication;
327: goto parse_flag;
1.1 deraadt 328: #endif /* KRB4 */
329:
1.5 dugsong 330: #ifdef AFS
1.17 markus 331: case oKerberosTgtPassing:
332: intptr = &options->kerberos_tgt_passing;
333: goto parse_flag;
334:
335: case oAFSTokenPassing:
336: intptr = &options->afs_token_passing;
337: goto parse_flag;
1.1 deraadt 338: #endif
1.17 markus 339:
340: case oFallBackToRsh:
341: intptr = &options->fallback_to_rsh;
342: goto parse_flag;
343:
344: case oUseRsh:
345: intptr = &options->use_rsh;
346: goto parse_flag;
347:
348: case oBatchMode:
349: intptr = &options->batch_mode;
350: goto parse_flag;
351:
352: case oCheckHostIP:
353: intptr = &options->check_host_ip;
354: goto parse_flag;
355:
356: case oStrictHostKeyChecking:
357: intptr = &options->strict_host_key_checking;
1.42 provos 358: arg = strdelim(&s);
1.40 ho 359: if (!arg || *arg == '\0')
1.17 markus 360: fatal("%.200s line %d: Missing yes/no argument.",
361: filename, linenum);
362: value = 0; /* To avoid compiler warning... */
1.38 provos 363: if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
1.17 markus 364: value = 1;
1.38 provos 365: else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
1.17 markus 366: value = 0;
1.38 provos 367: else if (strcmp(arg, "ask") == 0)
1.17 markus 368: value = 2;
369: else
370: fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum);
371: if (*activep && *intptr == -1)
372: *intptr = value;
373: break;
374:
375: case oCompression:
376: intptr = &options->compression;
377: goto parse_flag;
378:
379: case oKeepAlives:
380: intptr = &options->keepalives;
381: goto parse_flag;
382:
383: case oNumberOfPasswordPrompts:
384: intptr = &options->number_of_password_prompts;
385: goto parse_int;
386:
387: case oCompressionLevel:
388: intptr = &options->compression_level;
389: goto parse_int;
390:
391: case oIdentityFile:
1.42 provos 392: arg = strdelim(&s);
1.40 ho 393: if (!arg || *arg == '\0')
1.17 markus 394: fatal("%.200s line %d: Missing argument.", filename, linenum);
395: if (*activep) {
1.50 markus 396: intptr = &options->num_identity_files;
1.27 markus 397: if (*intptr >= SSH_MAX_IDENTITY_FILES)
1.17 markus 398: fatal("%.200s line %d: Too many identity files specified (max %d).",
399: filename, linenum, SSH_MAX_IDENTITY_FILES);
1.50 markus 400: charptr = &options->identity_files[*intptr];
1.38 provos 401: *charptr = xstrdup(arg);
1.27 markus 402: *intptr = *intptr + 1;
1.17 markus 403: }
404: break;
405:
1.34 markus 406: case oXAuthLocation:
407: charptr=&options->xauth_location;
408: goto parse_string;
409:
1.17 markus 410: case oUser:
411: charptr = &options->user;
412: parse_string:
1.42 provos 413: arg = strdelim(&s);
1.40 ho 414: if (!arg || *arg == '\0')
1.17 markus 415: fatal("%.200s line %d: Missing argument.", filename, linenum);
416: if (*activep && *charptr == NULL)
1.38 provos 417: *charptr = xstrdup(arg);
1.17 markus 418: break;
419:
420: case oGlobalKnownHostsFile:
421: charptr = &options->system_hostfile;
422: goto parse_string;
423:
424: case oUserKnownHostsFile:
425: charptr = &options->user_hostfile;
426: goto parse_string;
427:
1.27 markus 428: case oGlobalKnownHostsFile2:
429: charptr = &options->system_hostfile2;
430: goto parse_string;
431:
432: case oUserKnownHostsFile2:
433: charptr = &options->user_hostfile2;
434: goto parse_string;
435:
1.17 markus 436: case oHostName:
437: charptr = &options->hostname;
438: goto parse_string;
439:
1.52 markus 440: case oHostKeyAlias:
441: charptr = &options->host_key_alias;
442: goto parse_string;
443:
1.17 markus 444: case oProxyCommand:
445: charptr = &options->proxy_command;
446: string = xstrdup("");
1.42 provos 447: while ((arg = strdelim(&s)) != NULL && *arg != '\0') {
1.38 provos 448: string = xrealloc(string, strlen(string) + strlen(arg) + 2);
1.17 markus 449: strcat(string, " ");
1.38 provos 450: strcat(string, arg);
1.17 markus 451: }
452: if (*activep && *charptr == NULL)
453: *charptr = string;
454: else
455: xfree(string);
456: return 0;
457:
458: case oPort:
459: intptr = &options->port;
460: parse_int:
1.42 provos 461: arg = strdelim(&s);
1.40 ho 462: if (!arg || *arg == '\0')
1.17 markus 463: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 464: if (arg[0] < '0' || arg[0] > '9')
1.17 markus 465: fatal("%.200s line %d: Bad number.", filename, linenum);
1.21 markus 466:
467: /* Octal, decimal, or hex format? */
1.38 provos 468: value = strtol(arg, &endofnumber, 0);
469: if (arg == endofnumber)
1.21 markus 470: fatal("%.200s line %d: Bad number.", filename, linenum);
1.17 markus 471: if (*activep && *intptr == -1)
472: *intptr = value;
473: break;
474:
475: case oConnectionAttempts:
476: intptr = &options->connection_attempts;
477: goto parse_int;
478:
479: case oCipher:
480: intptr = &options->cipher;
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: value = cipher_number(arg);
1.17 markus 485: if (value == -1)
486: fatal("%.200s line %d: Bad cipher '%s'.",
1.38 provos 487: filename, linenum, arg ? arg : "<NONE>");
1.17 markus 488: if (*activep && *intptr == -1)
489: *intptr = value;
490: break;
491:
1.25 markus 492: case oCiphers:
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: if (!ciphers_valid(arg))
1.31 markus 497: fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.",
1.38 provos 498: filename, linenum, arg ? arg : "<NONE>");
1.25 markus 499: if (*activep && options->ciphers == NULL)
1.38 provos 500: options->ciphers = xstrdup(arg);
1.25 markus 501: break;
502:
503: case oProtocol:
504: intptr = &options->protocol;
1.42 provos 505: arg = strdelim(&s);
1.40 ho 506: if (!arg || *arg == '\0')
1.32 markus 507: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 508: value = proto_spec(arg);
1.25 markus 509: if (value == SSH_PROTO_UNKNOWN)
510: fatal("%.200s line %d: Bad protocol spec '%s'.",
1.38 provos 511: filename, linenum, arg ? arg : "<NONE>");
1.25 markus 512: if (*activep && *intptr == SSH_PROTO_UNKNOWN)
513: *intptr = value;
514: break;
515:
1.17 markus 516: case oLogLevel:
517: intptr = (int *) &options->log_level;
1.42 provos 518: arg = strdelim(&s);
1.38 provos 519: value = log_level_number(arg);
1.17 markus 520: if (value == (LogLevel) - 1)
521: fatal("%.200s line %d: unsupported log level '%s'\n",
1.38 provos 522: filename, linenum, arg ? arg : "<NONE>");
1.17 markus 523: if (*activep && (LogLevel) * intptr == -1)
524: *intptr = (LogLevel) value;
525: break;
526:
527: case oRemoteForward:
1.42 provos 528: arg = strdelim(&s);
1.40 ho 529: if (!arg || *arg == '\0')
1.17 markus 530: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 531: if (arg[0] < '0' || arg[0] > '9')
1.17 markus 532: fatal("%.200s line %d: Badly formatted port number.",
533: filename, linenum);
1.38 provos 534: fwd_port = atoi(arg);
1.42 provos 535: arg = strdelim(&s);
1.40 ho 536: if (!arg || *arg == '\0')
1.17 markus 537: fatal("%.200s line %d: Missing second argument.",
538: filename, linenum);
1.38 provos 539: if (sscanf(arg, "%255[^:]:%hu", buf, &fwd_host_port) != 2)
1.17 markus 540: fatal("%.200s line %d: Badly formatted host:port.",
541: filename, linenum);
542: if (*activep)
543: add_remote_forward(options, fwd_port, buf, fwd_host_port);
544: break;
545:
546: case oLocalForward:
1.42 provos 547: arg = strdelim(&s);
1.40 ho 548: if (!arg || *arg == '\0')
1.17 markus 549: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 550: if (arg[0] < '0' || arg[0] > '9')
1.17 markus 551: fatal("%.200s line %d: Badly formatted port number.",
552: filename, linenum);
1.38 provos 553: fwd_port = atoi(arg);
1.42 provos 554: arg = strdelim(&s);
1.40 ho 555: if (!arg || *arg == '\0')
1.17 markus 556: fatal("%.200s line %d: Missing second argument.",
557: filename, linenum);
1.38 provos 558: if (sscanf(arg, "%255[^:]:%hu", buf, &fwd_host_port) != 2)
1.17 markus 559: fatal("%.200s line %d: Badly formatted host:port.",
560: filename, linenum);
561: if (*activep)
562: add_local_forward(options, fwd_port, buf, fwd_host_port);
563: break;
564:
565: case oHost:
566: *activep = 0;
1.42 provos 567: while ((arg = strdelim(&s)) != NULL && *arg != '\0')
1.38 provos 568: if (match_pattern(host, arg)) {
569: debug("Applying options for %.100s", arg);
1.17 markus 570: *activep = 1;
571: break;
572: }
1.42 provos 573: /* Avoid garbage check below, as strdelim is done. */
1.17 markus 574: return 0;
575:
576: case oEscapeChar:
577: intptr = &options->escape_char;
1.42 provos 578: arg = strdelim(&s);
1.40 ho 579: if (!arg || *arg == '\0')
1.17 markus 580: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 581: if (arg[0] == '^' && arg[2] == 0 &&
1.51 markus 582: (u_char) arg[1] >= 64 && (u_char) arg[1] < 128)
583: value = (u_char) arg[1] & 31;
1.38 provos 584: else if (strlen(arg) == 1)
1.51 markus 585: value = (u_char) arg[0];
1.38 provos 586: else if (strcmp(arg, "none") == 0)
1.17 markus 587: value = -2;
588: else {
589: fatal("%.200s line %d: Bad escape character.",
590: filename, linenum);
591: /* NOTREACHED */
592: value = 0; /* Avoid compiler warning. */
593: }
594: if (*activep && *intptr == -1)
595: *intptr = value;
596: break;
597:
598: default:
599: fatal("process_config_line: Unimplemented opcode %d", opcode);
600: }
601:
602: /* Check that there is no garbage at end of line. */
1.57 djm 603: if ((arg = strdelim(&s)) != NULL && *arg != '\0') {
1.39 ho 604: fatal("%.200s line %d: garbage at end of line; \"%.200s\".",
605: filename, linenum, arg);
606: }
1.17 markus 607: return 0;
1.1 deraadt 608: }
609:
610:
1.19 markus 611: /*
612: * Reads the config file and modifies the options accordingly. Options
613: * should already be initialized before this call. This never returns if
614: * there is an error. If the file does not exist, this returns immediately.
615: */
1.1 deraadt 616:
1.26 markus 617: void
1.17 markus 618: read_config_file(const char *filename, const char *host, Options *options)
1.1 deraadt 619: {
1.17 markus 620: FILE *f;
621: char line[1024];
622: int active, linenum;
623: int bad_options = 0;
624:
625: /* Open the file. */
626: f = fopen(filename, "r");
627: if (!f)
628: return;
629:
630: debug("Reading configuration data %.200s", filename);
631:
1.19 markus 632: /*
633: * Mark that we are now processing the options. This flag is turned
634: * on/off by Host specifications.
635: */
1.17 markus 636: active = 1;
637: linenum = 0;
638: while (fgets(line, sizeof(line), f)) {
639: /* Update line number counter. */
640: linenum++;
641: if (process_config_line(options, host, line, filename, linenum, &active) != 0)
642: bad_options++;
643: }
644: fclose(f);
645: if (bad_options > 0)
646: fatal("%s: terminating, %d bad configuration options\n",
647: filename, bad_options);
1.1 deraadt 648: }
649:
1.19 markus 650: /*
651: * Initializes options to special values that indicate that they have not yet
652: * been set. Read_config_file will only set options with this value. Options
653: * are processed in the following order: command line, user config file,
654: * system config file. Last, fill_default_options is called.
655: */
1.1 deraadt 656:
1.26 markus 657: void
1.17 markus 658: initialize_options(Options * options)
1.1 deraadt 659: {
1.17 markus 660: memset(options, 'X', sizeof(*options));
661: options->forward_agent = -1;
662: options->forward_x11 = -1;
1.34 markus 663: options->xauth_location = NULL;
1.17 markus 664: options->gateway_ports = -1;
665: options->use_privileged_port = -1;
666: options->rhosts_authentication = -1;
667: options->rsa_authentication = -1;
1.50 markus 668: options->pubkey_authentication = -1;
1.59 ! markus 669: options->challenge_reponse_authentication = -1;
1.1 deraadt 670: #ifdef KRB4
1.17 markus 671: options->kerberos_authentication = -1;
1.1 deraadt 672: #endif
1.5 dugsong 673: #ifdef AFS
1.17 markus 674: options->kerberos_tgt_passing = -1;
675: options->afs_token_passing = -1;
1.1 deraadt 676: #endif
1.17 markus 677: options->password_authentication = -1;
1.48 markus 678: options->kbd_interactive_authentication = -1;
679: options->kbd_interactive_devices = NULL;
1.17 markus 680: options->rhosts_rsa_authentication = -1;
681: options->fallback_to_rsh = -1;
682: options->use_rsh = -1;
683: options->batch_mode = -1;
684: options->check_host_ip = -1;
685: options->strict_host_key_checking = -1;
686: options->compression = -1;
687: options->keepalives = -1;
688: options->compression_level = -1;
689: options->port = -1;
690: options->connection_attempts = -1;
691: options->number_of_password_prompts = -1;
692: options->cipher = -1;
1.25 markus 693: options->ciphers = NULL;
694: options->protocol = SSH_PROTO_UNKNOWN;
1.17 markus 695: options->num_identity_files = 0;
696: options->hostname = NULL;
1.52 markus 697: options->host_key_alias = NULL;
1.17 markus 698: options->proxy_command = NULL;
699: options->user = NULL;
700: options->escape_char = -1;
701: options->system_hostfile = NULL;
702: options->user_hostfile = NULL;
1.27 markus 703: options->system_hostfile2 = NULL;
704: options->user_hostfile2 = NULL;
1.17 markus 705: options->num_local_forwards = 0;
706: options->num_remote_forwards = 0;
707: options->log_level = (LogLevel) - 1;
1.1 deraadt 708: }
709:
1.19 markus 710: /*
711: * Called after processing other sources of option data, this fills those
712: * options for which no value has been specified with their default values.
713: */
1.1 deraadt 714:
1.26 markus 715: void
1.17 markus 716: fill_default_options(Options * options)
1.1 deraadt 717: {
1.17 markus 718: if (options->forward_agent == -1)
1.33 markus 719: options->forward_agent = 0;
1.17 markus 720: if (options->forward_x11 == -1)
1.23 markus 721: options->forward_x11 = 0;
1.34 markus 722: #ifdef XAUTH_PATH
723: if (options->xauth_location == NULL)
1.35 markus 724: options->xauth_location = XAUTH_PATH;
1.34 markus 725: #endif /* XAUTH_PATH */
1.17 markus 726: if (options->gateway_ports == -1)
727: options->gateway_ports = 0;
728: if (options->use_privileged_port == -1)
729: options->use_privileged_port = 1;
730: if (options->rhosts_authentication == -1)
731: options->rhosts_authentication = 1;
732: if (options->rsa_authentication == -1)
733: options->rsa_authentication = 1;
1.50 markus 734: if (options->pubkey_authentication == -1)
735: options->pubkey_authentication = 1;
1.59 ! markus 736: if (options->challenge_reponse_authentication == -1)
! 737: options->challenge_reponse_authentication = 0;
1.1 deraadt 738: #ifdef KRB4
1.17 markus 739: if (options->kerberos_authentication == -1)
1.45 provos 740: options->kerberos_authentication = 1;
1.5 dugsong 741: #endif /* KRB4 */
742: #ifdef AFS
1.17 markus 743: if (options->kerberos_tgt_passing == -1)
744: options->kerberos_tgt_passing = 1;
745: if (options->afs_token_passing == -1)
746: options->afs_token_passing = 1;
1.5 dugsong 747: #endif /* AFS */
1.17 markus 748: if (options->password_authentication == -1)
749: options->password_authentication = 1;
1.48 markus 750: if (options->kbd_interactive_authentication == -1)
1.59 ! markus 751: options->kbd_interactive_authentication = 1;
1.17 markus 752: if (options->rhosts_rsa_authentication == -1)
753: options->rhosts_rsa_authentication = 1;
754: if (options->fallback_to_rsh == -1)
1.41 deraadt 755: options->fallback_to_rsh = 0;
1.17 markus 756: if (options->use_rsh == -1)
757: options->use_rsh = 0;
758: if (options->batch_mode == -1)
759: options->batch_mode = 0;
760: if (options->check_host_ip == -1)
761: options->check_host_ip = 1;
762: if (options->strict_host_key_checking == -1)
763: options->strict_host_key_checking = 2; /* 2 is default */
764: if (options->compression == -1)
765: options->compression = 0;
766: if (options->keepalives == -1)
767: options->keepalives = 1;
768: if (options->compression_level == -1)
769: options->compression_level = 6;
770: if (options->port == -1)
771: options->port = 0; /* Filled in ssh_connect. */
772: if (options->connection_attempts == -1)
773: options->connection_attempts = 4;
774: if (options->number_of_password_prompts == -1)
775: options->number_of_password_prompts = 3;
776: /* Selected in ssh_login(). */
777: if (options->cipher == -1)
778: options->cipher = SSH_CIPHER_NOT_SET;
1.31 markus 779: /* options->ciphers, default set in myproposals.h */
1.25 markus 780: if (options->protocol == SSH_PROTO_UNKNOWN)
1.28 markus 781: options->protocol = SSH_PROTO_1|SSH_PROTO_2|SSH_PROTO_1_PREFERRED;
1.17 markus 782: if (options->num_identity_files == 0) {
1.50 markus 783: if (options->protocol & SSH_PROTO_1) {
784: options->identity_files[options->num_identity_files] =
1.55 markus 785: xmalloc(2 + strlen(_PATH_SSH_CLIENT_IDENTITY) + 1);
1.50 markus 786: sprintf(options->identity_files[options->num_identity_files++],
1.55 markus 787: "~/%.100s", _PATH_SSH_CLIENT_IDENTITY);
1.50 markus 788: }
789: if (options->protocol & SSH_PROTO_2) {
790: options->identity_files[options->num_identity_files] =
1.55 markus 791: xmalloc(2 + strlen(_PATH_SSH_CLIENT_ID_DSA) + 1);
1.50 markus 792: sprintf(options->identity_files[options->num_identity_files++],
1.55 markus 793: "~/%.100s", _PATH_SSH_CLIENT_ID_DSA);
1.50 markus 794: }
1.27 markus 795: }
1.17 markus 796: if (options->escape_char == -1)
797: options->escape_char = '~';
798: if (options->system_hostfile == NULL)
1.55 markus 799: options->system_hostfile = _PATH_SSH_SYSTEM_HOSTFILE;
1.17 markus 800: if (options->user_hostfile == NULL)
1.55 markus 801: options->user_hostfile = _PATH_SSH_USER_HOSTFILE;
1.27 markus 802: if (options->system_hostfile2 == NULL)
1.55 markus 803: options->system_hostfile2 = _PATH_SSH_SYSTEM_HOSTFILE2;
1.27 markus 804: if (options->user_hostfile2 == NULL)
1.55 markus 805: options->user_hostfile2 = _PATH_SSH_USER_HOSTFILE2;
1.17 markus 806: if (options->log_level == (LogLevel) - 1)
1.54 markus 807: options->log_level = SYSLOG_LEVEL_INFO;
1.17 markus 808: /* options->proxy_command should not be set by default */
809: /* options->user will be set in the main program if appropriate */
810: /* options->hostname will be set in the main program if appropriate */
1.52 markus 811: /* options->host_key_alias should not be set by default */
1.1 deraadt 812: }
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