Annotation of src/usr.bin/ssh/readconf.c, Revision 1.49.2.5
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"
1.49.2.5! miod 15: RCSID("$OpenBSD: readconf.c,v 1.90 2001/09/19 19:24:18 stevesk 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,
1.49.2.5! miod 99: #if defined(KRB4) || defined(KRB5)
1.17 markus 100: oKerberosAuthentication,
1.49.2.5! miod 101: #endif
! 102: #if defined(AFS) || defined(KRB5)
! 103: oKerberosTgtPassing,
! 104: #endif
1.1 deraadt 105: #ifdef AFS
1.49.2.5! miod 106: oAFSTokenPassing,
1.1 deraadt 107: #endif
1.17 markus 108: oIdentityFile, oHostName, oPort, oCipher, oRemoteForward, oLocalForward,
109: oUser, oHost, oEscapeChar, oRhostsRSAAuthentication, oProxyCommand,
110: oGlobalKnownHostsFile, oUserKnownHostsFile, oConnectionAttempts,
111: oBatchMode, oCheckHostIP, oStrictHostKeyChecking, oCompression,
1.49.2.1 jason 112: oCompressionLevel, oKeepAlives, oNumberOfPasswordPrompts,
113: oUsePrivilegedPort, oLogLevel, oCiphers, oProtocol, oMacs,
114: oGlobalKnownHostsFile2, oUserKnownHostsFile2, oPubkeyAuthentication,
1.49.2.3 jason 115: oKbdInteractiveAuthentication, oKbdInteractiveDevices, oHostKeyAlias,
1.49.2.4 jason 116: oDynamicForward, oPreferredAuthentications, oHostbasedAuthentication,
1.49.2.5! miod 117: oHostKeyAlgorithms, oBindAddress, oSmartcardDevice,
! 118: oClearAllForwardings
1.1 deraadt 119: } OpCodes;
120:
121: /* Textual representations of the tokens. */
122:
1.17 markus 123: static struct {
124: const char *name;
125: OpCodes opcode;
126: } keywords[] = {
127: { "forwardagent", oForwardAgent },
128: { "forwardx11", oForwardX11 },
1.34 markus 129: { "xauthlocation", oXAuthLocation },
1.17 markus 130: { "gatewayports", oGatewayPorts },
131: { "useprivilegedport", oUsePrivilegedPort },
132: { "rhostsauthentication", oRhostsAuthentication },
133: { "passwordauthentication", oPasswordAuthentication },
1.48 markus 134: { "kbdinteractiveauthentication", oKbdInteractiveAuthentication },
135: { "kbdinteractivedevices", oKbdInteractiveDevices },
1.17 markus 136: { "rsaauthentication", oRSAAuthentication },
1.49.2.1 jason 137: { "pubkeyauthentication", oPubkeyAuthentication },
138: { "dsaauthentication", oPubkeyAuthentication }, /* alias */
1.49.2.4 jason 139: { "rhostsrsaauthentication", oRhostsRSAAuthentication },
140: { "hostbasedauthentication", oHostbasedAuthentication },
1.49.2.1 jason 141: { "challengeresponseauthentication", oChallengeResponseAuthentication },
142: { "skeyauthentication", oChallengeResponseAuthentication }, /* alias */
143: { "tisauthentication", oChallengeResponseAuthentication }, /* alias */
1.49.2.5! miod 144: #if defined(KRB4) || defined(KRB5)
1.17 markus 145: { "kerberosauthentication", oKerberosAuthentication },
1.49.2.5! miod 146: #endif
! 147: #if defined(AFS) || defined(KRB5)
1.17 markus 148: { "kerberostgtpassing", oKerberosTgtPassing },
1.49.2.5! miod 149: #endif
! 150: #ifdef AFS
1.17 markus 151: { "afstokenpassing", oAFSTokenPassing },
1.1 deraadt 152: #endif
1.17 markus 153: { "fallbacktorsh", oFallBackToRsh },
154: { "usersh", oUseRsh },
155: { "identityfile", oIdentityFile },
1.49.2.1 jason 156: { "identityfile2", oIdentityFile }, /* alias */
1.17 markus 157: { "hostname", oHostName },
1.49.2.1 jason 158: { "hostkeyalias", oHostKeyAlias },
1.17 markus 159: { "proxycommand", oProxyCommand },
160: { "port", oPort },
161: { "cipher", oCipher },
1.25 markus 162: { "ciphers", oCiphers },
1.49.2.1 jason 163: { "macs", oMacs },
1.25 markus 164: { "protocol", oProtocol },
1.17 markus 165: { "remoteforward", oRemoteForward },
166: { "localforward", oLocalForward },
167: { "user", oUser },
168: { "host", oHost },
169: { "escapechar", oEscapeChar },
170: { "globalknownhostsfile", oGlobalKnownHostsFile },
1.49.2.5! miod 171: { "userknownhostsfile", oUserKnownHostsFile }, /* obsolete */
1.27 markus 172: { "globalknownhostsfile2", oGlobalKnownHostsFile2 },
1.49.2.5! miod 173: { "userknownhostsfile2", oUserKnownHostsFile2 }, /* obsolete */
1.17 markus 174: { "connectionattempts", oConnectionAttempts },
175: { "batchmode", oBatchMode },
176: { "checkhostip", oCheckHostIP },
177: { "stricthostkeychecking", oStrictHostKeyChecking },
178: { "compression", oCompression },
179: { "compressionlevel", oCompressionLevel },
180: { "keepalive", oKeepAlives },
181: { "numberofpasswordprompts", oNumberOfPasswordPrompts },
182: { "loglevel", oLogLevel },
1.49.2.4 jason 183: { "dynamicforward", oDynamicForward },
1.49.2.3 jason 184: { "preferredauthentications", oPreferredAuthentications },
1.49.2.4 jason 185: { "hostkeyalgorithms", oHostKeyAlgorithms },
1.49.2.5! miod 186: { "bindaddress", oBindAddress },
! 187: { "smartcarddevice", oSmartcardDevice },
! 188: { "clearallforwardings", oClearAllForwardings },
1.17 markus 189: { NULL, 0 }
1.13 markus 190: };
191:
1.19 markus 192: /*
193: * Adds a local TCP/IP port forward to options. Never returns if there is an
194: * error.
195: */
1.1 deraadt 196:
1.26 markus 197: void
1.22 markus 198: add_local_forward(Options *options, u_short port, const char *host,
199: u_short host_port)
1.1 deraadt 200: {
1.17 markus 201: Forward *fwd;
202: extern uid_t original_real_uid;
203: if (port < IPPORT_RESERVED && original_real_uid != 0)
1.49.2.3 jason 204: fatal("Privileged ports can only be forwarded by root.");
1.17 markus 205: if (options->num_local_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
206: fatal("Too many local forwards (max %d).", SSH_MAX_FORWARDS_PER_DIRECTION);
207: fwd = &options->local_forwards[options->num_local_forwards++];
208: fwd->port = port;
209: fwd->host = xstrdup(host);
210: fwd->host_port = host_port;
1.1 deraadt 211: }
212:
1.19 markus 213: /*
214: * Adds a remote TCP/IP port forward to options. Never returns if there is
215: * an error.
216: */
1.1 deraadt 217:
1.26 markus 218: void
1.22 markus 219: add_remote_forward(Options *options, u_short port, const char *host,
220: u_short host_port)
1.1 deraadt 221: {
1.17 markus 222: Forward *fwd;
223: if (options->num_remote_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
224: fatal("Too many remote forwards (max %d).",
225: SSH_MAX_FORWARDS_PER_DIRECTION);
226: fwd = &options->remote_forwards[options->num_remote_forwards++];
227: fwd->port = port;
228: fwd->host = xstrdup(host);
229: fwd->host_port = host_port;
1.1 deraadt 230: }
231:
1.49.2.5! miod 232: static void
! 233: clear_forwardings(Options *options)
! 234: {
! 235: int i;
! 236:
! 237: for (i = 0; i < options->num_local_forwards; i++)
! 238: xfree(options->local_forwards[i].host);
! 239: options->num_local_forwards = 0;
! 240: for (i = 0; i < options->num_remote_forwards; i++)
! 241: xfree(options->remote_forwards[i].host);
! 242: options->num_remote_forwards = 0;
! 243: }
! 244:
1.19 markus 245: /*
1.49.2.4 jason 246: * Returns the number of the token pointed to by cp or oBadOption.
1.19 markus 247: */
1.1 deraadt 248:
1.26 markus 249: static OpCodes
1.17 markus 250: parse_token(const char *cp, const char *filename, int linenum)
1.1 deraadt 251: {
1.49.2.1 jason 252: u_int i;
1.1 deraadt 253:
1.17 markus 254: for (i = 0; keywords[i].name; i++)
1.20 markus 255: if (strcasecmp(cp, keywords[i].name) == 0)
1.17 markus 256: return keywords[i].opcode;
257:
1.49.2.4 jason 258: error("%s: line %d: Bad configuration option: %s",
259: filename, linenum, cp);
1.17 markus 260: return oBadOption;
1.1 deraadt 261: }
262:
1.19 markus 263: /*
264: * Processes a single option line as used in the configuration files. This
265: * only sets those values that have not already been set.
266: */
1.1 deraadt 267:
1.14 markus 268: int
269: process_config_line(Options *options, const char *host,
1.17 markus 270: char *line, const char *filename, int linenum,
271: int *activep)
1.1 deraadt 272: {
1.38 provos 273: char buf[256], *s, *string, **charptr, *endofnumber, *keyword, *arg;
1.22 markus 274: int opcode, *intptr, value;
275: u_short fwd_port, fwd_host_port;
1.49.2.5! miod 276: char sfwd_host_port[6];
1.1 deraadt 277:
1.42 provos 278: s = line;
279: /* Get the keyword. (Each line is supposed to begin with a keyword). */
280: keyword = strdelim(&s);
281: /* Ignore leading whitespace. */
282: if (*keyword == '\0')
1.43 markus 283: keyword = strdelim(&s);
1.49.2.1 jason 284: if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#')
1.17 markus 285: return 0;
286:
1.38 provos 287: opcode = parse_token(keyword, filename, linenum);
1.17 markus 288:
289: switch (opcode) {
290: case oBadOption:
1.19 markus 291: /* don't panic, but count bad options */
292: return -1;
1.17 markus 293: /* NOTREACHED */
294: case oForwardAgent:
295: intptr = &options->forward_agent;
296: parse_flag:
1.42 provos 297: arg = strdelim(&s);
1.40 ho 298: if (!arg || *arg == '\0')
1.17 markus 299: fatal("%.200s line %d: Missing yes/no argument.", filename, linenum);
300: value = 0; /* To avoid compiler warning... */
1.38 provos 301: if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
1.17 markus 302: value = 1;
1.38 provos 303: else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
1.17 markus 304: value = 0;
305: else
306: fatal("%.200s line %d: Bad yes/no argument.", filename, linenum);
307: if (*activep && *intptr == -1)
308: *intptr = value;
309: break;
310:
311: case oForwardX11:
312: intptr = &options->forward_x11;
313: goto parse_flag;
314:
315: case oGatewayPorts:
316: intptr = &options->gateway_ports;
317: goto parse_flag;
318:
319: case oUsePrivilegedPort:
320: intptr = &options->use_privileged_port;
321: goto parse_flag;
322:
323: case oRhostsAuthentication:
324: intptr = &options->rhosts_authentication;
325: goto parse_flag;
326:
327: case oPasswordAuthentication:
328: intptr = &options->password_authentication;
329: goto parse_flag;
330:
1.48 markus 331: case oKbdInteractiveAuthentication:
332: intptr = &options->kbd_interactive_authentication;
333: goto parse_flag;
334:
335: case oKbdInteractiveDevices:
336: charptr = &options->kbd_interactive_devices;
337: goto parse_string;
338:
1.49.2.1 jason 339: case oPubkeyAuthentication:
340: intptr = &options->pubkey_authentication;
1.30 markus 341: goto parse_flag;
342:
1.17 markus 343: case oRSAAuthentication:
344: intptr = &options->rsa_authentication;
345: goto parse_flag;
346:
347: case oRhostsRSAAuthentication:
348: intptr = &options->rhosts_rsa_authentication;
349: goto parse_flag;
350:
1.49.2.4 jason 351: case oHostbasedAuthentication:
352: intptr = &options->hostbased_authentication;
353: goto parse_flag;
354:
1.49.2.1 jason 355: case oChallengeResponseAuthentication:
1.49.2.5! miod 356: intptr = &options->challenge_response_authentication;
1.17 markus 357: goto parse_flag;
1.49.2.5! miod 358: #if defined(KRB4) || defined(KRB5)
1.17 markus 359: case oKerberosAuthentication:
360: intptr = &options->kerberos_authentication;
361: goto parse_flag;
1.49.2.5! miod 362: #endif
! 363: #if defined(AFS) || defined(KRB5)
1.17 markus 364: case oKerberosTgtPassing:
365: intptr = &options->kerberos_tgt_passing;
366: goto parse_flag;
1.49.2.5! miod 367: #endif
! 368: #ifdef AFS
1.17 markus 369: case oAFSTokenPassing:
370: intptr = &options->afs_token_passing;
371: goto parse_flag;
1.1 deraadt 372: #endif
1.17 markus 373: case oFallBackToRsh:
374: intptr = &options->fallback_to_rsh;
375: goto parse_flag;
376:
377: case oUseRsh:
378: intptr = &options->use_rsh;
379: goto parse_flag;
380:
381: case oBatchMode:
382: intptr = &options->batch_mode;
383: goto parse_flag;
384:
385: case oCheckHostIP:
386: intptr = &options->check_host_ip;
387: goto parse_flag;
388:
389: case oStrictHostKeyChecking:
390: intptr = &options->strict_host_key_checking;
1.42 provos 391: arg = strdelim(&s);
1.40 ho 392: if (!arg || *arg == '\0')
1.49.2.1 jason 393: fatal("%.200s line %d: Missing yes/no/ask argument.",
1.17 markus 394: filename, linenum);
395: value = 0; /* To avoid compiler warning... */
1.38 provos 396: if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
1.17 markus 397: value = 1;
1.38 provos 398: else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
1.17 markus 399: value = 0;
1.38 provos 400: else if (strcmp(arg, "ask") == 0)
1.17 markus 401: value = 2;
402: else
403: fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum);
404: if (*activep && *intptr == -1)
405: *intptr = value;
406: break;
407:
408: case oCompression:
409: intptr = &options->compression;
410: goto parse_flag;
411:
412: case oKeepAlives:
413: intptr = &options->keepalives;
414: goto parse_flag;
415:
416: case oNumberOfPasswordPrompts:
417: intptr = &options->number_of_password_prompts;
418: goto parse_int;
419:
420: case oCompressionLevel:
421: intptr = &options->compression_level;
422: goto parse_int;
423:
424: case oIdentityFile:
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) {
1.49.2.1 jason 429: intptr = &options->num_identity_files;
1.27 markus 430: if (*intptr >= SSH_MAX_IDENTITY_FILES)
1.17 markus 431: fatal("%.200s line %d: Too many identity files specified (max %d).",
432: filename, linenum, SSH_MAX_IDENTITY_FILES);
1.49.2.1 jason 433: charptr = &options->identity_files[*intptr];
1.38 provos 434: *charptr = xstrdup(arg);
1.27 markus 435: *intptr = *intptr + 1;
1.17 markus 436: }
437: break;
438:
1.34 markus 439: case oXAuthLocation:
440: charptr=&options->xauth_location;
441: goto parse_string;
442:
1.17 markus 443: case oUser:
444: charptr = &options->user;
445: parse_string:
1.42 provos 446: arg = strdelim(&s);
1.40 ho 447: if (!arg || *arg == '\0')
1.17 markus 448: fatal("%.200s line %d: Missing argument.", filename, linenum);
449: if (*activep && *charptr == NULL)
1.38 provos 450: *charptr = xstrdup(arg);
1.17 markus 451: break;
452:
453: case oGlobalKnownHostsFile:
454: charptr = &options->system_hostfile;
455: goto parse_string;
456:
457: case oUserKnownHostsFile:
458: charptr = &options->user_hostfile;
459: goto parse_string;
460:
1.27 markus 461: case oGlobalKnownHostsFile2:
462: charptr = &options->system_hostfile2;
463: goto parse_string;
464:
465: case oUserKnownHostsFile2:
466: charptr = &options->user_hostfile2;
467: goto parse_string;
468:
1.17 markus 469: case oHostName:
470: charptr = &options->hostname;
471: goto parse_string;
472:
1.49.2.1 jason 473: case oHostKeyAlias:
474: charptr = &options->host_key_alias;
475: goto parse_string;
476:
1.49.2.3 jason 477: case oPreferredAuthentications:
478: charptr = &options->preferred_authentications;
479: goto parse_string;
480:
1.49.2.5! miod 481: case oBindAddress:
! 482: charptr = &options->bind_address;
! 483: goto parse_string;
! 484:
! 485: case oSmartcardDevice:
! 486: charptr = &options->smartcard_device;
! 487: goto parse_string;
! 488:
1.17 markus 489: case oProxyCommand:
490: charptr = &options->proxy_command;
491: string = xstrdup("");
1.42 provos 492: while ((arg = strdelim(&s)) != NULL && *arg != '\0') {
1.38 provos 493: string = xrealloc(string, strlen(string) + strlen(arg) + 2);
1.17 markus 494: strcat(string, " ");
1.38 provos 495: strcat(string, arg);
1.17 markus 496: }
497: if (*activep && *charptr == NULL)
498: *charptr = string;
499: else
500: xfree(string);
501: return 0;
502:
503: case oPort:
504: intptr = &options->port;
505: parse_int:
1.42 provos 506: arg = strdelim(&s);
1.40 ho 507: if (!arg || *arg == '\0')
1.17 markus 508: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 509: if (arg[0] < '0' || arg[0] > '9')
1.17 markus 510: fatal("%.200s line %d: Bad number.", filename, linenum);
1.21 markus 511:
512: /* Octal, decimal, or hex format? */
1.38 provos 513: value = strtol(arg, &endofnumber, 0);
514: if (arg == endofnumber)
1.21 markus 515: fatal("%.200s line %d: Bad number.", filename, linenum);
1.17 markus 516: if (*activep && *intptr == -1)
517: *intptr = value;
518: break;
519:
520: case oConnectionAttempts:
521: intptr = &options->connection_attempts;
522: goto parse_int;
523:
524: case oCipher:
525: intptr = &options->cipher;
1.42 provos 526: arg = strdelim(&s);
1.40 ho 527: if (!arg || *arg == '\0')
1.32 markus 528: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 529: value = cipher_number(arg);
1.17 markus 530: if (value == -1)
531: fatal("%.200s line %d: Bad cipher '%s'.",
1.38 provos 532: filename, linenum, arg ? arg : "<NONE>");
1.17 markus 533: if (*activep && *intptr == -1)
534: *intptr = value;
535: break;
536:
1.25 markus 537: case oCiphers:
1.42 provos 538: arg = strdelim(&s);
1.40 ho 539: if (!arg || *arg == '\0')
1.32 markus 540: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 541: if (!ciphers_valid(arg))
1.31 markus 542: fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.",
1.38 provos 543: filename, linenum, arg ? arg : "<NONE>");
1.25 markus 544: if (*activep && options->ciphers == NULL)
1.38 provos 545: options->ciphers = xstrdup(arg);
1.25 markus 546: break;
547:
1.49.2.1 jason 548: case oMacs:
549: arg = strdelim(&s);
550: if (!arg || *arg == '\0')
551: fatal("%.200s line %d: Missing argument.", filename, linenum);
552: if (!mac_valid(arg))
553: fatal("%.200s line %d: Bad SSH2 Mac spec '%s'.",
554: filename, linenum, arg ? arg : "<NONE>");
555: if (*activep && options->macs == NULL)
556: options->macs = xstrdup(arg);
557: break;
558:
1.49.2.4 jason 559: case oHostKeyAlgorithms:
560: arg = strdelim(&s);
561: if (!arg || *arg == '\0')
562: fatal("%.200s line %d: Missing argument.", filename, linenum);
563: if (!key_names_valid2(arg))
564: fatal("%.200s line %d: Bad protocol 2 host key algorithms '%s'.",
565: filename, linenum, arg ? arg : "<NONE>");
566: if (*activep && options->hostkeyalgorithms == NULL)
567: options->hostkeyalgorithms = xstrdup(arg);
568: break;
569:
1.25 markus 570: case oProtocol:
571: intptr = &options->protocol;
1.42 provos 572: arg = strdelim(&s);
1.40 ho 573: if (!arg || *arg == '\0')
1.32 markus 574: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 575: value = proto_spec(arg);
1.25 markus 576: if (value == SSH_PROTO_UNKNOWN)
577: fatal("%.200s line %d: Bad protocol spec '%s'.",
1.38 provos 578: filename, linenum, arg ? arg : "<NONE>");
1.25 markus 579: if (*activep && *intptr == SSH_PROTO_UNKNOWN)
580: *intptr = value;
581: break;
582:
1.17 markus 583: case oLogLevel:
584: intptr = (int *) &options->log_level;
1.42 provos 585: arg = strdelim(&s);
1.38 provos 586: value = log_level_number(arg);
1.17 markus 587: if (value == (LogLevel) - 1)
1.49.2.3 jason 588: fatal("%.200s line %d: unsupported log level '%s'",
1.38 provos 589: filename, linenum, arg ? arg : "<NONE>");
1.17 markus 590: if (*activep && (LogLevel) * intptr == -1)
591: *intptr = (LogLevel) value;
592: break;
593:
594: case oLocalForward:
1.49.2.5! miod 595: case oRemoteForward:
1.42 provos 596: arg = strdelim(&s);
1.40 ho 597: if (!arg || *arg == '\0')
1.49.2.5! miod 598: fatal("%.200s line %d: Missing port argument.",
! 599: filename, linenum);
! 600: if ((fwd_port = a2port(arg)) == 0)
! 601: fatal("%.200s line %d: Bad listen port.",
! 602: filename, linenum);
1.42 provos 603: arg = strdelim(&s);
1.40 ho 604: if (!arg || *arg == '\0')
1.17 markus 605: fatal("%.200s line %d: Missing second argument.",
1.49.2.5! miod 606: filename, linenum);
! 607: if (sscanf(arg, "%255[^:]:%5[0-9]", buf, sfwd_host_port) != 2 &&
! 608: sscanf(arg, "%255[^/]/%5[0-9]", buf, sfwd_host_port) != 2)
! 609: fatal("%.200s line %d: Bad forwarding specification.",
! 610: filename, linenum);
! 611: if ((fwd_host_port = a2port(sfwd_host_port)) == 0)
! 612: fatal("%.200s line %d: Bad forwarding port.",
! 613: filename, linenum);
! 614: if (*activep) {
! 615: if (opcode == oLocalForward)
! 616: add_local_forward(options, fwd_port, buf,
! 617: fwd_host_port);
! 618: else if (opcode == oRemoteForward)
! 619: add_remote_forward(options, fwd_port, buf,
! 620: fwd_host_port);
! 621: }
1.17 markus 622: break;
623:
1.49.2.4 jason 624: case oDynamicForward:
625: arg = strdelim(&s);
626: if (!arg || *arg == '\0')
627: fatal("%.200s line %d: Missing port argument.",
628: filename, linenum);
629: fwd_port = a2port(arg);
630: if (fwd_port == 0)
631: fatal("%.200s line %d: Badly formatted port number.",
632: filename, linenum);
1.49.2.5! miod 633: if (*activep)
! 634: add_local_forward(options, fwd_port, "socks4", 0);
1.49.2.4 jason 635: break;
636:
1.49.2.5! miod 637: case oClearAllForwardings:
! 638: intptr = &options->clear_forwardings;
! 639: goto parse_flag;
! 640:
1.17 markus 641: case oHost:
642: *activep = 0;
1.42 provos 643: while ((arg = strdelim(&s)) != NULL && *arg != '\0')
1.38 provos 644: if (match_pattern(host, arg)) {
645: debug("Applying options for %.100s", arg);
1.17 markus 646: *activep = 1;
647: break;
648: }
1.42 provos 649: /* Avoid garbage check below, as strdelim is done. */
1.17 markus 650: return 0;
651:
652: case oEscapeChar:
653: intptr = &options->escape_char;
1.42 provos 654: arg = strdelim(&s);
1.40 ho 655: if (!arg || *arg == '\0')
1.17 markus 656: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 657: if (arg[0] == '^' && arg[2] == 0 &&
1.49.2.1 jason 658: (u_char) arg[1] >= 64 && (u_char) arg[1] < 128)
659: value = (u_char) arg[1] & 31;
1.38 provos 660: else if (strlen(arg) == 1)
1.49.2.1 jason 661: value = (u_char) arg[0];
1.38 provos 662: else if (strcmp(arg, "none") == 0)
1.49.2.5! miod 663: value = SSH_ESCAPECHAR_NONE;
1.17 markus 664: else {
665: fatal("%.200s line %d: Bad escape character.",
666: filename, linenum);
667: /* NOTREACHED */
668: value = 0; /* Avoid compiler warning. */
669: }
670: if (*activep && *intptr == -1)
671: *intptr = value;
672: break;
673:
674: default:
675: fatal("process_config_line: Unimplemented opcode %d", opcode);
676: }
677:
678: /* Check that there is no garbage at end of line. */
1.49.2.1 jason 679: if ((arg = strdelim(&s)) != NULL && *arg != '\0') {
1.39 ho 680: fatal("%.200s line %d: garbage at end of line; \"%.200s\".",
681: filename, linenum, arg);
682: }
1.17 markus 683: return 0;
1.1 deraadt 684: }
685:
686:
1.19 markus 687: /*
688: * Reads the config file and modifies the options accordingly. Options
689: * should already be initialized before this call. This never returns if
1.49.2.5! miod 690: * there is an error. If the file does not exist, this returns 0.
1.19 markus 691: */
1.1 deraadt 692:
1.49.2.5! miod 693: int
1.17 markus 694: read_config_file(const char *filename, const char *host, Options *options)
1.1 deraadt 695: {
1.17 markus 696: FILE *f;
697: char line[1024];
698: int active, linenum;
699: int bad_options = 0;
700:
701: /* Open the file. */
702: f = fopen(filename, "r");
703: if (!f)
1.49.2.5! miod 704: return 0;
1.17 markus 705:
706: debug("Reading configuration data %.200s", filename);
707:
1.19 markus 708: /*
709: * Mark that we are now processing the options. This flag is turned
710: * on/off by Host specifications.
711: */
1.17 markus 712: active = 1;
713: linenum = 0;
714: while (fgets(line, sizeof(line), f)) {
715: /* Update line number counter. */
716: linenum++;
717: if (process_config_line(options, host, line, filename, linenum, &active) != 0)
718: bad_options++;
719: }
720: fclose(f);
721: if (bad_options > 0)
1.49.2.3 jason 722: fatal("%s: terminating, %d bad configuration options",
1.17 markus 723: filename, bad_options);
1.49.2.5! miod 724: return 1;
1.1 deraadt 725: }
726:
1.19 markus 727: /*
728: * Initializes options to special values that indicate that they have not yet
729: * been set. Read_config_file will only set options with this value. Options
730: * are processed in the following order: command line, user config file,
731: * system config file. Last, fill_default_options is called.
732: */
1.1 deraadt 733:
1.26 markus 734: void
1.17 markus 735: initialize_options(Options * options)
1.1 deraadt 736: {
1.17 markus 737: memset(options, 'X', sizeof(*options));
738: options->forward_agent = -1;
739: options->forward_x11 = -1;
1.34 markus 740: options->xauth_location = NULL;
1.17 markus 741: options->gateway_ports = -1;
742: options->use_privileged_port = -1;
743: options->rhosts_authentication = -1;
744: options->rsa_authentication = -1;
1.49.2.1 jason 745: options->pubkey_authentication = -1;
1.49.2.5! miod 746: options->challenge_response_authentication = -1;
! 747: #if defined(KRB4) || defined(KRB5)
1.17 markus 748: options->kerberos_authentication = -1;
1.1 deraadt 749: #endif
1.49.2.5! miod 750: #if defined(AFS) || defined(KRB5)
1.17 markus 751: options->kerberos_tgt_passing = -1;
1.49.2.5! miod 752: #endif
! 753: #ifdef AFS
1.17 markus 754: options->afs_token_passing = -1;
1.1 deraadt 755: #endif
1.17 markus 756: options->password_authentication = -1;
1.48 markus 757: options->kbd_interactive_authentication = -1;
758: options->kbd_interactive_devices = NULL;
1.17 markus 759: options->rhosts_rsa_authentication = -1;
1.49.2.4 jason 760: options->hostbased_authentication = -1;
1.17 markus 761: options->fallback_to_rsh = -1;
762: options->use_rsh = -1;
763: options->batch_mode = -1;
764: options->check_host_ip = -1;
765: options->strict_host_key_checking = -1;
766: options->compression = -1;
767: options->keepalives = -1;
768: options->compression_level = -1;
769: options->port = -1;
770: options->connection_attempts = -1;
771: options->number_of_password_prompts = -1;
772: options->cipher = -1;
1.25 markus 773: options->ciphers = NULL;
1.49.2.1 jason 774: options->macs = NULL;
1.49.2.4 jason 775: options->hostkeyalgorithms = NULL;
1.25 markus 776: options->protocol = SSH_PROTO_UNKNOWN;
1.17 markus 777: options->num_identity_files = 0;
778: options->hostname = NULL;
1.49.2.1 jason 779: options->host_key_alias = NULL;
1.17 markus 780: options->proxy_command = NULL;
781: options->user = NULL;
782: options->escape_char = -1;
783: options->system_hostfile = NULL;
784: options->user_hostfile = NULL;
1.27 markus 785: options->system_hostfile2 = NULL;
786: options->user_hostfile2 = NULL;
1.17 markus 787: options->num_local_forwards = 0;
788: options->num_remote_forwards = 0;
1.49.2.5! miod 789: options->clear_forwardings = -1;
1.17 markus 790: options->log_level = (LogLevel) - 1;
1.49.2.3 jason 791: options->preferred_authentications = NULL;
1.49.2.5! miod 792: options->bind_address = NULL;
! 793: options->smartcard_device = NULL;
1.1 deraadt 794: }
795:
1.19 markus 796: /*
797: * Called after processing other sources of option data, this fills those
798: * options for which no value has been specified with their default values.
799: */
1.1 deraadt 800:
1.26 markus 801: void
1.17 markus 802: fill_default_options(Options * options)
1.1 deraadt 803: {
1.49.2.1 jason 804: int len;
805:
1.17 markus 806: if (options->forward_agent == -1)
1.33 markus 807: options->forward_agent = 0;
1.17 markus 808: if (options->forward_x11 == -1)
1.23 markus 809: options->forward_x11 = 0;
1.49.2.5! miod 810: #ifdef _PATH_XAUTH
1.34 markus 811: if (options->xauth_location == NULL)
1.49.2.5! miod 812: options->xauth_location = _PATH_XAUTH;
! 813: #endif
1.17 markus 814: if (options->gateway_ports == -1)
815: options->gateway_ports = 0;
816: if (options->use_privileged_port == -1)
1.49.2.3 jason 817: options->use_privileged_port = 0;
1.17 markus 818: if (options->rhosts_authentication == -1)
819: options->rhosts_authentication = 1;
820: if (options->rsa_authentication == -1)
821: options->rsa_authentication = 1;
1.49.2.1 jason 822: if (options->pubkey_authentication == -1)
823: options->pubkey_authentication = 1;
1.49.2.5! miod 824: if (options->challenge_response_authentication == -1)
! 825: options->challenge_response_authentication = 1;
! 826: #if defined(KRB4) || defined(KRB5)
1.17 markus 827: if (options->kerberos_authentication == -1)
1.45 provos 828: options->kerberos_authentication = 1;
1.49.2.5! miod 829: #endif
! 830: #if defined(AFS) || defined(KRB5)
1.17 markus 831: if (options->kerberos_tgt_passing == -1)
832: options->kerberos_tgt_passing = 1;
1.49.2.5! miod 833: #endif
! 834: #ifdef AFS
1.17 markus 835: if (options->afs_token_passing == -1)
836: options->afs_token_passing = 1;
1.49.2.5! miod 837: #endif
1.17 markus 838: if (options->password_authentication == -1)
839: options->password_authentication = 1;
1.48 markus 840: if (options->kbd_interactive_authentication == -1)
1.49.2.1 jason 841: options->kbd_interactive_authentication = 1;
1.17 markus 842: if (options->rhosts_rsa_authentication == -1)
843: options->rhosts_rsa_authentication = 1;
1.49.2.4 jason 844: if (options->hostbased_authentication == -1)
845: options->hostbased_authentication = 0;
1.17 markus 846: if (options->fallback_to_rsh == -1)
1.41 deraadt 847: options->fallback_to_rsh = 0;
1.17 markus 848: if (options->use_rsh == -1)
849: options->use_rsh = 0;
850: if (options->batch_mode == -1)
851: options->batch_mode = 0;
852: if (options->check_host_ip == -1)
853: options->check_host_ip = 1;
854: if (options->strict_host_key_checking == -1)
855: options->strict_host_key_checking = 2; /* 2 is default */
856: if (options->compression == -1)
857: options->compression = 0;
858: if (options->keepalives == -1)
859: options->keepalives = 1;
860: if (options->compression_level == -1)
861: options->compression_level = 6;
862: if (options->port == -1)
863: options->port = 0; /* Filled in ssh_connect. */
864: if (options->connection_attempts == -1)
1.49.2.5! miod 865: options->connection_attempts = 1;
1.17 markus 866: if (options->number_of_password_prompts == -1)
867: options->number_of_password_prompts = 3;
868: /* Selected in ssh_login(). */
869: if (options->cipher == -1)
870: options->cipher = SSH_CIPHER_NOT_SET;
1.31 markus 871: /* options->ciphers, default set in myproposals.h */
1.49.2.1 jason 872: /* options->macs, default set in myproposals.h */
1.49.2.4 jason 873: /* options->hostkeyalgorithms, default set in myproposals.h */
1.25 markus 874: if (options->protocol == SSH_PROTO_UNKNOWN)
1.49.2.4 jason 875: options->protocol = SSH_PROTO_1|SSH_PROTO_2;
1.17 markus 876: if (options->num_identity_files == 0) {
1.49.2.1 jason 877: if (options->protocol & SSH_PROTO_1) {
878: len = 2 + strlen(_PATH_SSH_CLIENT_IDENTITY) + 1;
879: options->identity_files[options->num_identity_files] =
880: xmalloc(len);
881: snprintf(options->identity_files[options->num_identity_files++],
882: len, "~/%.100s", _PATH_SSH_CLIENT_IDENTITY);
883: }
884: if (options->protocol & SSH_PROTO_2) {
1.49.2.3 jason 885: len = 2 + strlen(_PATH_SSH_CLIENT_ID_RSA) + 1;
886: options->identity_files[options->num_identity_files] =
887: xmalloc(len);
888: snprintf(options->identity_files[options->num_identity_files++],
889: len, "~/%.100s", _PATH_SSH_CLIENT_ID_RSA);
890:
1.49.2.1 jason 891: len = 2 + strlen(_PATH_SSH_CLIENT_ID_DSA) + 1;
892: options->identity_files[options->num_identity_files] =
893: xmalloc(len);
894: snprintf(options->identity_files[options->num_identity_files++],
895: len, "~/%.100s", _PATH_SSH_CLIENT_ID_DSA);
896: }
1.27 markus 897: }
1.17 markus 898: if (options->escape_char == -1)
899: options->escape_char = '~';
900: if (options->system_hostfile == NULL)
1.49.2.1 jason 901: options->system_hostfile = _PATH_SSH_SYSTEM_HOSTFILE;
1.17 markus 902: if (options->user_hostfile == NULL)
1.49.2.1 jason 903: options->user_hostfile = _PATH_SSH_USER_HOSTFILE;
1.27 markus 904: if (options->system_hostfile2 == NULL)
1.49.2.1 jason 905: options->system_hostfile2 = _PATH_SSH_SYSTEM_HOSTFILE2;
1.27 markus 906: if (options->user_hostfile2 == NULL)
1.49.2.1 jason 907: options->user_hostfile2 = _PATH_SSH_USER_HOSTFILE2;
1.17 markus 908: if (options->log_level == (LogLevel) - 1)
909: options->log_level = SYSLOG_LEVEL_INFO;
1.49.2.5! miod 910: if (options->clear_forwardings == 1)
! 911: clear_forwardings(options);
1.17 markus 912: /* options->proxy_command should not be set by default */
913: /* options->user will be set in the main program if appropriate */
914: /* options->hostname will be set in the main program if appropriate */
1.49.2.1 jason 915: /* options->host_key_alias should not be set by default */
1.49.2.3 jason 916: /* options->preferred_authentications will be set in ssh */
1.1 deraadt 917: }
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