Annotation of src/usr.bin/ssh/readconf.c, Revision 1.76
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"
1.76 ! markus 15: RCSID("$OpenBSD: readconf.c,v 1.75 2001/04/15 21:28:35 stevesk 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,
! 114: oHostKeyAlgorithms
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 },
165: { "userknownhostsfile", oUserKnownHostsFile },
1.27 markus 166: { "globalknownhostsfile2", oGlobalKnownHostsFile2 },
167: { "userknownhostsfile2", oUserKnownHostsFile2 },
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 },
1.17 markus 180: { NULL, 0 }
1.13 markus 181: };
182:
1.19 markus 183: /*
184: * Adds a local TCP/IP port forward to options. Never returns if there is an
185: * error.
186: */
1.1 deraadt 187:
1.26 markus 188: void
1.22 markus 189: add_local_forward(Options *options, u_short port, const char *host,
190: u_short host_port)
1.1 deraadt 191: {
1.17 markus 192: Forward *fwd;
193: extern uid_t original_real_uid;
194: if (port < IPPORT_RESERVED && original_real_uid != 0)
1.64 millert 195: fatal("Privileged ports can only be forwarded by root.");
1.17 markus 196: if (options->num_local_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
197: fatal("Too many local forwards (max %d).", SSH_MAX_FORWARDS_PER_DIRECTION);
198: fwd = &options->local_forwards[options->num_local_forwards++];
199: fwd->port = port;
200: fwd->host = xstrdup(host);
201: fwd->host_port = host_port;
1.1 deraadt 202: }
203:
1.19 markus 204: /*
205: * Adds a remote TCP/IP port forward to options. Never returns if there is
206: * an error.
207: */
1.1 deraadt 208:
1.26 markus 209: void
1.22 markus 210: add_remote_forward(Options *options, u_short port, const char *host,
211: u_short host_port)
1.1 deraadt 212: {
1.17 markus 213: Forward *fwd;
214: if (options->num_remote_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
215: fatal("Too many remote forwards (max %d).",
216: SSH_MAX_FORWARDS_PER_DIRECTION);
217: fwd = &options->remote_forwards[options->num_remote_forwards++];
218: fwd->port = port;
219: fwd->host = xstrdup(host);
220: fwd->host_port = host_port;
1.1 deraadt 221: }
222:
1.19 markus 223: /*
1.70 stevesk 224: * Returns the number of the token pointed to by cp or oBadOption.
1.19 markus 225: */
1.1 deraadt 226:
1.26 markus 227: static OpCodes
1.17 markus 228: parse_token(const char *cp, const char *filename, int linenum)
1.1 deraadt 229: {
1.51 markus 230: u_int i;
1.1 deraadt 231:
1.17 markus 232: for (i = 0; keywords[i].name; i++)
1.20 markus 233: if (strcasecmp(cp, keywords[i].name) == 0)
1.17 markus 234: return keywords[i].opcode;
235:
1.75 stevesk 236: error("%s: line %d: Bad configuration option: %s",
237: filename, linenum, cp);
1.17 markus 238: return oBadOption;
1.1 deraadt 239: }
240:
1.19 markus 241: /*
242: * Processes a single option line as used in the configuration files. This
243: * only sets those values that have not already been set.
244: */
1.1 deraadt 245:
1.14 markus 246: int
247: process_config_line(Options *options, const char *host,
1.17 markus 248: char *line, const char *filename, int linenum,
249: int *activep)
1.1 deraadt 250: {
1.38 provos 251: char buf[256], *s, *string, **charptr, *endofnumber, *keyword, *arg;
1.22 markus 252: int opcode, *intptr, value;
253: u_short fwd_port, fwd_host_port;
1.1 deraadt 254:
1.42 provos 255: s = line;
256: /* Get the keyword. (Each line is supposed to begin with a keyword). */
257: keyword = strdelim(&s);
258: /* Ignore leading whitespace. */
259: if (*keyword == '\0')
1.43 markus 260: keyword = strdelim(&s);
1.56 deraadt 261: if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#')
1.17 markus 262: return 0;
263:
1.38 provos 264: opcode = parse_token(keyword, filename, linenum);
1.17 markus 265:
266: switch (opcode) {
267: case oBadOption:
1.19 markus 268: /* don't panic, but count bad options */
269: return -1;
1.17 markus 270: /* NOTREACHED */
271: case oForwardAgent:
272: intptr = &options->forward_agent;
273: parse_flag:
1.42 provos 274: arg = strdelim(&s);
1.40 ho 275: if (!arg || *arg == '\0')
1.17 markus 276: fatal("%.200s line %d: Missing yes/no argument.", filename, linenum);
277: value = 0; /* To avoid compiler warning... */
1.38 provos 278: if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
1.17 markus 279: value = 1;
1.38 provos 280: else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
1.17 markus 281: value = 0;
282: else
283: fatal("%.200s line %d: Bad yes/no argument.", filename, linenum);
284: if (*activep && *intptr == -1)
285: *intptr = value;
286: break;
287:
288: case oForwardX11:
289: intptr = &options->forward_x11;
290: goto parse_flag;
291:
292: case oGatewayPorts:
293: intptr = &options->gateway_ports;
294: goto parse_flag;
295:
296: case oUsePrivilegedPort:
297: intptr = &options->use_privileged_port;
298: goto parse_flag;
299:
300: case oRhostsAuthentication:
301: intptr = &options->rhosts_authentication;
302: goto parse_flag;
303:
304: case oPasswordAuthentication:
305: intptr = &options->password_authentication;
306: goto parse_flag;
307:
1.48 markus 308: case oKbdInteractiveAuthentication:
309: intptr = &options->kbd_interactive_authentication;
310: goto parse_flag;
311:
312: case oKbdInteractiveDevices:
313: charptr = &options->kbd_interactive_devices;
314: goto parse_string;
315:
1.50 markus 316: case oPubkeyAuthentication:
317: intptr = &options->pubkey_authentication;
1.30 markus 318: goto parse_flag;
319:
1.17 markus 320: case oRSAAuthentication:
321: intptr = &options->rsa_authentication;
322: goto parse_flag;
323:
324: case oRhostsRSAAuthentication:
325: intptr = &options->rhosts_rsa_authentication;
326: goto parse_flag;
327:
1.72 markus 328: case oHostbasedAuthentication:
329: intptr = &options->hostbased_authentication;
330: goto parse_flag;
331:
1.59 markus 332: case oChallengeResponseAuthentication:
333: intptr = &options->challenge_reponse_authentication;
1.17 markus 334: goto parse_flag;
1.16 markus 335:
1.1 deraadt 336: #ifdef KRB4
1.17 markus 337: case oKerberosAuthentication:
338: intptr = &options->kerberos_authentication;
339: goto parse_flag;
1.1 deraadt 340: #endif /* KRB4 */
341:
1.5 dugsong 342: #ifdef AFS
1.17 markus 343: case oKerberosTgtPassing:
344: intptr = &options->kerberos_tgt_passing;
345: goto parse_flag;
346:
347: case oAFSTokenPassing:
348: intptr = &options->afs_token_passing;
349: goto parse_flag;
1.1 deraadt 350: #endif
1.17 markus 351:
352: case oFallBackToRsh:
353: intptr = &options->fallback_to_rsh;
354: goto parse_flag;
355:
356: case oUseRsh:
357: intptr = &options->use_rsh;
358: goto parse_flag;
359:
360: case oBatchMode:
361: intptr = &options->batch_mode;
362: goto parse_flag;
363:
364: case oCheckHostIP:
365: intptr = &options->check_host_ip;
366: goto parse_flag;
367:
368: case oStrictHostKeyChecking:
369: intptr = &options->strict_host_key_checking;
1.42 provos 370: arg = strdelim(&s);
1.40 ho 371: if (!arg || *arg == '\0')
1.60 stevesk 372: fatal("%.200s line %d: Missing yes/no/ask argument.",
1.17 markus 373: filename, linenum);
374: value = 0; /* To avoid compiler warning... */
1.38 provos 375: if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
1.17 markus 376: value = 1;
1.38 provos 377: else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
1.17 markus 378: value = 0;
1.38 provos 379: else if (strcmp(arg, "ask") == 0)
1.17 markus 380: value = 2;
381: else
382: fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum);
383: if (*activep && *intptr == -1)
384: *intptr = value;
385: break;
386:
387: case oCompression:
388: intptr = &options->compression;
389: goto parse_flag;
390:
391: case oKeepAlives:
392: intptr = &options->keepalives;
393: goto parse_flag;
394:
395: case oNumberOfPasswordPrompts:
396: intptr = &options->number_of_password_prompts;
397: goto parse_int;
398:
399: case oCompressionLevel:
400: intptr = &options->compression_level;
401: goto parse_int;
402:
403: case oIdentityFile:
1.42 provos 404: arg = strdelim(&s);
1.40 ho 405: if (!arg || *arg == '\0')
1.17 markus 406: fatal("%.200s line %d: Missing argument.", filename, linenum);
407: if (*activep) {
1.50 markus 408: intptr = &options->num_identity_files;
1.27 markus 409: if (*intptr >= SSH_MAX_IDENTITY_FILES)
1.17 markus 410: fatal("%.200s line %d: Too many identity files specified (max %d).",
411: filename, linenum, SSH_MAX_IDENTITY_FILES);
1.50 markus 412: charptr = &options->identity_files[*intptr];
1.38 provos 413: *charptr = xstrdup(arg);
1.27 markus 414: *intptr = *intptr + 1;
1.17 markus 415: }
416: break;
417:
1.34 markus 418: case oXAuthLocation:
419: charptr=&options->xauth_location;
420: goto parse_string;
421:
1.17 markus 422: case oUser:
423: charptr = &options->user;
424: parse_string:
1.42 provos 425: arg = strdelim(&s);
1.40 ho 426: if (!arg || *arg == '\0')
1.17 markus 427: fatal("%.200s line %d: Missing argument.", filename, linenum);
428: if (*activep && *charptr == NULL)
1.38 provos 429: *charptr = xstrdup(arg);
1.17 markus 430: break;
431:
432: case oGlobalKnownHostsFile:
433: charptr = &options->system_hostfile;
434: goto parse_string;
435:
436: case oUserKnownHostsFile:
437: charptr = &options->user_hostfile;
438: goto parse_string;
439:
1.27 markus 440: case oGlobalKnownHostsFile2:
441: charptr = &options->system_hostfile2;
442: goto parse_string;
443:
444: case oUserKnownHostsFile2:
445: charptr = &options->user_hostfile2;
446: goto parse_string;
447:
1.17 markus 448: case oHostName:
449: charptr = &options->hostname;
450: goto parse_string;
451:
1.52 markus 452: case oHostKeyAlias:
453: charptr = &options->host_key_alias;
454: goto parse_string;
455:
1.67 markus 456: case oPreferredAuthentications:
457: charptr = &options->preferred_authentications;
458: goto parse_string;
459:
1.17 markus 460: case oProxyCommand:
461: charptr = &options->proxy_command;
462: string = xstrdup("");
1.42 provos 463: while ((arg = strdelim(&s)) != NULL && *arg != '\0') {
1.38 provos 464: string = xrealloc(string, strlen(string) + strlen(arg) + 2);
1.17 markus 465: strcat(string, " ");
1.38 provos 466: strcat(string, arg);
1.17 markus 467: }
468: if (*activep && *charptr == NULL)
469: *charptr = string;
470: else
471: xfree(string);
472: return 0;
473:
474: case oPort:
475: intptr = &options->port;
476: parse_int:
1.42 provos 477: arg = strdelim(&s);
1.40 ho 478: if (!arg || *arg == '\0')
1.17 markus 479: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 480: if (arg[0] < '0' || arg[0] > '9')
1.17 markus 481: fatal("%.200s line %d: Bad number.", filename, linenum);
1.21 markus 482:
483: /* Octal, decimal, or hex format? */
1.38 provos 484: value = strtol(arg, &endofnumber, 0);
485: if (arg == endofnumber)
1.21 markus 486: fatal("%.200s line %d: Bad number.", filename, linenum);
1.17 markus 487: if (*activep && *intptr == -1)
488: *intptr = value;
489: break;
490:
491: case oConnectionAttempts:
492: intptr = &options->connection_attempts;
493: goto parse_int;
494:
495: case oCipher:
496: intptr = &options->cipher;
1.42 provos 497: arg = strdelim(&s);
1.40 ho 498: if (!arg || *arg == '\0')
1.32 markus 499: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 500: value = cipher_number(arg);
1.17 markus 501: if (value == -1)
502: fatal("%.200s line %d: Bad cipher '%s'.",
1.38 provos 503: filename, linenum, arg ? arg : "<NONE>");
1.17 markus 504: if (*activep && *intptr == -1)
505: *intptr = value;
506: break;
507:
1.25 markus 508: case oCiphers:
1.42 provos 509: arg = strdelim(&s);
1.40 ho 510: if (!arg || *arg == '\0')
1.32 markus 511: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 512: if (!ciphers_valid(arg))
1.31 markus 513: fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.",
1.38 provos 514: filename, linenum, arg ? arg : "<NONE>");
1.25 markus 515: if (*activep && options->ciphers == NULL)
1.38 provos 516: options->ciphers = xstrdup(arg);
1.25 markus 517: break;
518:
1.62 markus 519: case oMacs:
520: arg = strdelim(&s);
521: if (!arg || *arg == '\0')
522: fatal("%.200s line %d: Missing argument.", filename, linenum);
523: if (!mac_valid(arg))
524: fatal("%.200s line %d: Bad SSH2 Mac spec '%s'.",
525: filename, linenum, arg ? arg : "<NONE>");
526: if (*activep && options->macs == NULL)
527: options->macs = xstrdup(arg);
528: break;
529:
1.76 ! markus 530: case oHostKeyAlgorithms:
! 531: arg = strdelim(&s);
! 532: if (!arg || *arg == '\0')
! 533: fatal("%.200s line %d: Missing argument.", filename, linenum);
! 534: if (!key_names_valid2(arg))
! 535: fatal("%.200s line %d: Bad protocol 2 host key algorithms '%s'.",
! 536: filename, linenum, arg ? arg : "<NONE>");
! 537: if (*activep && options->hostkeyalgorithms == NULL)
! 538: options->hostkeyalgorithms = xstrdup(arg);
! 539: break;
! 540:
1.25 markus 541: case oProtocol:
542: intptr = &options->protocol;
1.42 provos 543: arg = strdelim(&s);
1.40 ho 544: if (!arg || *arg == '\0')
1.32 markus 545: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 546: value = proto_spec(arg);
1.25 markus 547: if (value == SSH_PROTO_UNKNOWN)
548: fatal("%.200s line %d: Bad protocol spec '%s'.",
1.38 provos 549: filename, linenum, arg ? arg : "<NONE>");
1.25 markus 550: if (*activep && *intptr == SSH_PROTO_UNKNOWN)
551: *intptr = value;
552: break;
553:
1.17 markus 554: case oLogLevel:
555: intptr = (int *) &options->log_level;
1.42 provos 556: arg = strdelim(&s);
1.38 provos 557: value = log_level_number(arg);
1.17 markus 558: if (value == (LogLevel) - 1)
1.64 millert 559: fatal("%.200s line %d: unsupported log level '%s'",
1.38 provos 560: filename, linenum, arg ? arg : "<NONE>");
1.17 markus 561: if (*activep && (LogLevel) * intptr == -1)
562: *intptr = (LogLevel) value;
563: break;
564:
565: case oRemoteForward:
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);
1.74 stevesk 569: fwd_port = a2port(arg);
570: if (fwd_port == 0)
1.17 markus 571: fatal("%.200s line %d: Badly formatted port number.",
572: filename, linenum);
1.42 provos 573: arg = strdelim(&s);
1.40 ho 574: if (!arg || *arg == '\0')
1.17 markus 575: fatal("%.200s line %d: Missing second argument.",
576: filename, linenum);
1.38 provos 577: if (sscanf(arg, "%255[^:]:%hu", buf, &fwd_host_port) != 2)
1.17 markus 578: fatal("%.200s line %d: Badly formatted host:port.",
579: filename, linenum);
580: if (*activep)
581: add_remote_forward(options, fwd_port, buf, fwd_host_port);
582: break;
583:
584: case oLocalForward:
1.42 provos 585: arg = strdelim(&s);
1.40 ho 586: if (!arg || *arg == '\0')
1.17 markus 587: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.74 stevesk 588: fwd_port = a2port(arg);
589: if (fwd_port == 0)
1.17 markus 590: fatal("%.200s line %d: Badly formatted port number.",
591: filename, linenum);
1.42 provos 592: arg = strdelim(&s);
1.40 ho 593: if (!arg || *arg == '\0')
1.17 markus 594: fatal("%.200s line %d: Missing second argument.",
595: filename, linenum);
1.38 provos 596: if (sscanf(arg, "%255[^:]:%hu", buf, &fwd_host_port) != 2)
1.17 markus 597: fatal("%.200s line %d: Badly formatted host:port.",
598: filename, linenum);
599: if (*activep)
600: add_local_forward(options, fwd_port, buf, fwd_host_port);
601: break;
1.71 markus 602:
603: case oDynamicForward:
604: arg = strdelim(&s);
605: if (!arg || *arg == '\0')
606: fatal("%.200s line %d: Missing port argument.",
607: filename, linenum);
1.74 stevesk 608: fwd_port = a2port(arg);
609: if (fwd_port == 0)
1.71 markus 610: fatal("%.200s line %d: Badly formatted port number.",
611: filename, linenum);
612: add_local_forward(options, fwd_port, "socks4", 0);
1.72 markus 613: break;
1.17 markus 614:
615: case oHost:
616: *activep = 0;
1.42 provos 617: while ((arg = strdelim(&s)) != NULL && *arg != '\0')
1.38 provos 618: if (match_pattern(host, arg)) {
619: debug("Applying options for %.100s", arg);
1.17 markus 620: *activep = 1;
621: break;
622: }
1.42 provos 623: /* Avoid garbage check below, as strdelim is done. */
1.17 markus 624: return 0;
625:
626: case oEscapeChar:
627: intptr = &options->escape_char;
1.42 provos 628: arg = strdelim(&s);
1.40 ho 629: if (!arg || *arg == '\0')
1.17 markus 630: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 631: if (arg[0] == '^' && arg[2] == 0 &&
1.51 markus 632: (u_char) arg[1] >= 64 && (u_char) arg[1] < 128)
633: value = (u_char) arg[1] & 31;
1.38 provos 634: else if (strlen(arg) == 1)
1.51 markus 635: value = (u_char) arg[0];
1.38 provos 636: else if (strcmp(arg, "none") == 0)
1.17 markus 637: value = -2;
638: else {
639: fatal("%.200s line %d: Bad escape character.",
640: filename, linenum);
641: /* NOTREACHED */
642: value = 0; /* Avoid compiler warning. */
643: }
644: if (*activep && *intptr == -1)
645: *intptr = value;
646: break;
647:
648: default:
649: fatal("process_config_line: Unimplemented opcode %d", opcode);
650: }
651:
652: /* Check that there is no garbage at end of line. */
1.57 djm 653: if ((arg = strdelim(&s)) != NULL && *arg != '\0') {
1.39 ho 654: fatal("%.200s line %d: garbage at end of line; \"%.200s\".",
655: filename, linenum, arg);
656: }
1.17 markus 657: return 0;
1.1 deraadt 658: }
659:
660:
1.19 markus 661: /*
662: * Reads the config file and modifies the options accordingly. Options
663: * should already be initialized before this call. This never returns if
664: * there is an error. If the file does not exist, this returns immediately.
665: */
1.1 deraadt 666:
1.26 markus 667: void
1.17 markus 668: read_config_file(const char *filename, const char *host, Options *options)
1.1 deraadt 669: {
1.17 markus 670: FILE *f;
671: char line[1024];
672: int active, linenum;
673: int bad_options = 0;
674:
675: /* Open the file. */
676: f = fopen(filename, "r");
677: if (!f)
678: return;
679:
680: debug("Reading configuration data %.200s", filename);
681:
1.19 markus 682: /*
683: * Mark that we are now processing the options. This flag is turned
684: * on/off by Host specifications.
685: */
1.17 markus 686: active = 1;
687: linenum = 0;
688: while (fgets(line, sizeof(line), f)) {
689: /* Update line number counter. */
690: linenum++;
691: if (process_config_line(options, host, line, filename, linenum, &active) != 0)
692: bad_options++;
693: }
694: fclose(f);
695: if (bad_options > 0)
1.64 millert 696: fatal("%s: terminating, %d bad configuration options",
1.17 markus 697: filename, bad_options);
1.1 deraadt 698: }
699:
1.19 markus 700: /*
701: * Initializes options to special values that indicate that they have not yet
702: * been set. Read_config_file will only set options with this value. Options
703: * are processed in the following order: command line, user config file,
704: * system config file. Last, fill_default_options is called.
705: */
1.1 deraadt 706:
1.26 markus 707: void
1.17 markus 708: initialize_options(Options * options)
1.1 deraadt 709: {
1.17 markus 710: memset(options, 'X', sizeof(*options));
711: options->forward_agent = -1;
712: options->forward_x11 = -1;
1.34 markus 713: options->xauth_location = NULL;
1.17 markus 714: options->gateway_ports = -1;
715: options->use_privileged_port = -1;
716: options->rhosts_authentication = -1;
717: options->rsa_authentication = -1;
1.50 markus 718: options->pubkey_authentication = -1;
1.59 markus 719: options->challenge_reponse_authentication = -1;
1.1 deraadt 720: #ifdef KRB4
1.17 markus 721: options->kerberos_authentication = -1;
1.1 deraadt 722: #endif
1.5 dugsong 723: #ifdef AFS
1.17 markus 724: options->kerberos_tgt_passing = -1;
725: options->afs_token_passing = -1;
1.1 deraadt 726: #endif
1.17 markus 727: options->password_authentication = -1;
1.48 markus 728: options->kbd_interactive_authentication = -1;
729: options->kbd_interactive_devices = NULL;
1.17 markus 730: options->rhosts_rsa_authentication = -1;
1.72 markus 731: options->hostbased_authentication = -1;
1.17 markus 732: options->fallback_to_rsh = -1;
733: options->use_rsh = -1;
734: options->batch_mode = -1;
735: options->check_host_ip = -1;
736: options->strict_host_key_checking = -1;
737: options->compression = -1;
738: options->keepalives = -1;
739: options->compression_level = -1;
740: options->port = -1;
741: options->connection_attempts = -1;
742: options->number_of_password_prompts = -1;
743: options->cipher = -1;
1.25 markus 744: options->ciphers = NULL;
1.62 markus 745: options->macs = NULL;
1.76 ! markus 746: options->hostkeyalgorithms = NULL;
1.25 markus 747: options->protocol = SSH_PROTO_UNKNOWN;
1.17 markus 748: options->num_identity_files = 0;
749: options->hostname = NULL;
1.52 markus 750: options->host_key_alias = NULL;
1.17 markus 751: options->proxy_command = NULL;
752: options->user = NULL;
753: options->escape_char = -1;
754: options->system_hostfile = NULL;
755: options->user_hostfile = NULL;
1.27 markus 756: options->system_hostfile2 = NULL;
757: options->user_hostfile2 = NULL;
1.17 markus 758: options->num_local_forwards = 0;
759: options->num_remote_forwards = 0;
760: options->log_level = (LogLevel) - 1;
1.67 markus 761: options->preferred_authentications = NULL;
1.1 deraadt 762: }
763:
1.19 markus 764: /*
765: * Called after processing other sources of option data, this fills those
766: * options for which no value has been specified with their default values.
767: */
1.1 deraadt 768:
1.26 markus 769: void
1.17 markus 770: fill_default_options(Options * options)
1.1 deraadt 771: {
1.61 deraadt 772: int len;
773:
1.17 markus 774: if (options->forward_agent == -1)
1.33 markus 775: options->forward_agent = 0;
1.17 markus 776: if (options->forward_x11 == -1)
1.23 markus 777: options->forward_x11 = 0;
1.34 markus 778: #ifdef XAUTH_PATH
779: if (options->xauth_location == NULL)
1.35 markus 780: options->xauth_location = XAUTH_PATH;
1.34 markus 781: #endif /* XAUTH_PATH */
1.17 markus 782: if (options->gateway_ports == -1)
783: options->gateway_ports = 0;
784: if (options->use_privileged_port == -1)
1.65 markus 785: options->use_privileged_port = 0;
1.17 markus 786: if (options->rhosts_authentication == -1)
787: options->rhosts_authentication = 1;
788: if (options->rsa_authentication == -1)
789: options->rsa_authentication = 1;
1.50 markus 790: if (options->pubkey_authentication == -1)
791: options->pubkey_authentication = 1;
1.59 markus 792: if (options->challenge_reponse_authentication == -1)
793: options->challenge_reponse_authentication = 0;
1.1 deraadt 794: #ifdef KRB4
1.17 markus 795: if (options->kerberos_authentication == -1)
1.45 provos 796: options->kerberos_authentication = 1;
1.5 dugsong 797: #endif /* KRB4 */
798: #ifdef AFS
1.17 markus 799: if (options->kerberos_tgt_passing == -1)
800: options->kerberos_tgt_passing = 1;
801: if (options->afs_token_passing == -1)
802: options->afs_token_passing = 1;
1.5 dugsong 803: #endif /* AFS */
1.17 markus 804: if (options->password_authentication == -1)
805: options->password_authentication = 1;
1.48 markus 806: if (options->kbd_interactive_authentication == -1)
1.59 markus 807: options->kbd_interactive_authentication = 1;
1.17 markus 808: if (options->rhosts_rsa_authentication == -1)
809: options->rhosts_rsa_authentication = 1;
1.72 markus 810: if (options->hostbased_authentication == -1)
811: options->hostbased_authentication = 0;
1.17 markus 812: if (options->fallback_to_rsh == -1)
1.41 deraadt 813: options->fallback_to_rsh = 0;
1.17 markus 814: if (options->use_rsh == -1)
815: options->use_rsh = 0;
816: if (options->batch_mode == -1)
817: options->batch_mode = 0;
818: if (options->check_host_ip == -1)
819: options->check_host_ip = 1;
820: if (options->strict_host_key_checking == -1)
821: options->strict_host_key_checking = 2; /* 2 is default */
822: if (options->compression == -1)
823: options->compression = 0;
824: if (options->keepalives == -1)
825: options->keepalives = 1;
826: if (options->compression_level == -1)
827: options->compression_level = 6;
828: if (options->port == -1)
829: options->port = 0; /* Filled in ssh_connect. */
830: if (options->connection_attempts == -1)
831: options->connection_attempts = 4;
832: if (options->number_of_password_prompts == -1)
833: options->number_of_password_prompts = 3;
834: /* Selected in ssh_login(). */
835: if (options->cipher == -1)
836: options->cipher = SSH_CIPHER_NOT_SET;
1.31 markus 837: /* options->ciphers, default set in myproposals.h */
1.62 markus 838: /* options->macs, default set in myproposals.h */
1.76 ! markus 839: /* options->hostkeyalgorithms, default set in myproposals.h */
1.25 markus 840: if (options->protocol == SSH_PROTO_UNKNOWN)
1.69 markus 841: options->protocol = SSH_PROTO_1|SSH_PROTO_2;
1.17 markus 842: if (options->num_identity_files == 0) {
1.50 markus 843: if (options->protocol & SSH_PROTO_1) {
1.61 deraadt 844: len = 2 + strlen(_PATH_SSH_CLIENT_IDENTITY) + 1;
1.50 markus 845: options->identity_files[options->num_identity_files] =
1.61 deraadt 846: xmalloc(len);
847: snprintf(options->identity_files[options->num_identity_files++],
848: len, "~/%.100s", _PATH_SSH_CLIENT_IDENTITY);
1.50 markus 849: }
850: if (options->protocol & SSH_PROTO_2) {
1.63 deraadt 851: len = 2 + strlen(_PATH_SSH_CLIENT_ID_RSA) + 1;
852: options->identity_files[options->num_identity_files] =
853: xmalloc(len);
854: snprintf(options->identity_files[options->num_identity_files++],
855: len, "~/%.100s", _PATH_SSH_CLIENT_ID_RSA);
856:
1.61 deraadt 857: len = 2 + strlen(_PATH_SSH_CLIENT_ID_DSA) + 1;
1.50 markus 858: options->identity_files[options->num_identity_files] =
1.61 deraadt 859: xmalloc(len);
860: snprintf(options->identity_files[options->num_identity_files++],
861: len, "~/%.100s", _PATH_SSH_CLIENT_ID_DSA);
1.50 markus 862: }
1.27 markus 863: }
1.17 markus 864: if (options->escape_char == -1)
865: options->escape_char = '~';
866: if (options->system_hostfile == NULL)
1.55 markus 867: options->system_hostfile = _PATH_SSH_SYSTEM_HOSTFILE;
1.17 markus 868: if (options->user_hostfile == NULL)
1.55 markus 869: options->user_hostfile = _PATH_SSH_USER_HOSTFILE;
1.27 markus 870: if (options->system_hostfile2 == NULL)
1.55 markus 871: options->system_hostfile2 = _PATH_SSH_SYSTEM_HOSTFILE2;
1.27 markus 872: if (options->user_hostfile2 == NULL)
1.55 markus 873: options->user_hostfile2 = _PATH_SSH_USER_HOSTFILE2;
1.17 markus 874: if (options->log_level == (LogLevel) - 1)
1.54 markus 875: options->log_level = SYSLOG_LEVEL_INFO;
1.17 markus 876: /* options->proxy_command should not be set by default */
877: /* options->user will be set in the main program if appropriate */
878: /* options->hostname will be set in the main program if appropriate */
1.52 markus 879: /* options->host_key_alias should not be set by default */
1.67 markus 880: /* options->preferred_authentications will be set in ssh */
1.1 deraadt 881: }
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