Annotation of src/usr.bin/ssh/readconf.c, Revision 1.105
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"
1.105 ! markus 15: RCSID("$OpenBSD: readconf.c,v 1.104 2003/04/01 10:22:21 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"
1.62 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
1.96 markus 44: User foo
1.1 deraadt 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
1.96 markus 68: PublicKeyAuthentication no
1.1 deraadt 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: 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,
1.100 deraadt 95: oPasswordAuthentication, oRSAAuthentication,
1.59 markus 96: oChallengeResponseAuthentication, oXAuthLocation,
1.82 dugsong 97: #if defined(KRB4) || defined(KRB5)
1.17 markus 98: oKerberosAuthentication,
1.82 dugsong 99: #endif
100: #if defined(AFS) || defined(KRB5)
101: oKerberosTgtPassing,
102: #endif
1.1 deraadt 103: #ifdef AFS
1.82 dugsong 104: oAFSTokenPassing,
1.1 deraadt 105: #endif
1.17 markus 106: oIdentityFile, oHostName, oPort, oCipher, oRemoteForward, oLocalForward,
107: oUser, oHost, oEscapeChar, oRhostsRSAAuthentication, oProxyCommand,
108: oGlobalKnownHostsFile, oUserKnownHostsFile, oConnectionAttempts,
109: oBatchMode, oCheckHostIP, oStrictHostKeyChecking, oCompression,
1.59 markus 110: oCompressionLevel, oKeepAlives, oNumberOfPasswordPrompts,
1.62 markus 111: oUsePrivilegedPort, oLogLevel, oCiphers, oProtocol, oMacs,
1.50 markus 112: oGlobalKnownHostsFile2, oUserKnownHostsFile2, oPubkeyAuthentication,
1.67 markus 113: oKbdInteractiveAuthentication, oKbdInteractiveDevices, oHostKeyAlias,
1.76 markus 114: oDynamicForward, oPreferredAuthentications, oHostbasedAuthentication,
1.90 stevesk 115: oHostKeyAlgorithms, oBindAddress, oSmartcardDevice,
1.96 markus 116: oClearAllForwardings, oNoHostAuthenticationForLocalhost,
1.105 ! markus 117: oEnableSSHKeysign, oRekeyLimit,
1.96 markus 118: oDeprecated
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 },
1.50 markus 137: { "pubkeyauthentication", oPubkeyAuthentication },
1.59 markus 138: { "dsaauthentication", oPubkeyAuthentication }, /* alias */
1.72 markus 139: { "rhostsrsaauthentication", oRhostsRSAAuthentication },
1.73 markus 140: { "hostbasedauthentication", oHostbasedAuthentication },
1.59 markus 141: { "challengeresponseauthentication", oChallengeResponseAuthentication },
142: { "skeyauthentication", oChallengeResponseAuthentication }, /* alias */
143: { "tisauthentication", oChallengeResponseAuthentication }, /* alias */
1.82 dugsong 144: #if defined(KRB4) || defined(KRB5)
1.17 markus 145: { "kerberosauthentication", oKerberosAuthentication },
1.82 dugsong 146: #endif
147: #if defined(AFS) || defined(KRB5)
148: { "kerberostgtpassing", oKerberosTgtPassing },
149: #endif
1.5 dugsong 150: #ifdef AFS
1.17 markus 151: { "afstokenpassing", oAFSTokenPassing },
1.1 deraadt 152: #endif
1.96 markus 153: { "fallbacktorsh", oDeprecated },
154: { "usersh", oDeprecated },
1.17 markus 155: { "identityfile", oIdentityFile },
1.50 markus 156: { "identityfile2", oIdentityFile }, /* alias */
1.17 markus 157: { "hostname", oHostName },
1.52 markus 158: { "hostkeyalias", oHostKeyAlias },
1.17 markus 159: { "proxycommand", oProxyCommand },
160: { "port", oPort },
161: { "cipher", oCipher },
1.25 markus 162: { "ciphers", oCiphers },
1.62 markus 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 },
1.81 markus 171: { "userknownhostsfile", oUserKnownHostsFile }, /* obsolete */
1.27 markus 172: { "globalknownhostsfile2", oGlobalKnownHostsFile2 },
1.81 markus 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 },
1.71 markus 183: { "dynamicforward", oDynamicForward },
1.67 markus 184: { "preferredauthentications", oPreferredAuthentications },
1.76 markus 185: { "hostkeyalgorithms", oHostKeyAlgorithms },
1.77 markus 186: { "bindaddress", oBindAddress },
1.85 jakob 187: { "smartcarddevice", oSmartcardDevice },
1.93 deraadt 188: { "clearallforwardings", oClearAllForwardings },
1.101 markus 189: { "enablesshkeysign", oEnableSSHKeysign },
1.93 deraadt 190: { "nohostauthenticationforlocalhost", oNoHostAuthenticationForLocalhost },
1.105 ! markus 191: { "rekeylimit", oRekeyLimit },
1.92 stevesk 192: { NULL, oBadOption }
1.13 markus 193: };
194:
1.19 markus 195: /*
196: * Adds a local TCP/IP port forward to options. Never returns if there is an
197: * error.
198: */
1.1 deraadt 199:
1.26 markus 200: void
1.22 markus 201: add_local_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: extern uid_t original_real_uid;
206: if (port < IPPORT_RESERVED && original_real_uid != 0)
1.64 millert 207: fatal("Privileged ports can only be forwarded by root.");
1.17 markus 208: if (options->num_local_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
209: fatal("Too many local forwards (max %d).", SSH_MAX_FORWARDS_PER_DIRECTION);
210: fwd = &options->local_forwards[options->num_local_forwards++];
211: fwd->port = port;
212: fwd->host = xstrdup(host);
213: fwd->host_port = host_port;
1.1 deraadt 214: }
215:
1.19 markus 216: /*
217: * Adds a remote TCP/IP port forward to options. Never returns if there is
218: * an error.
219: */
1.1 deraadt 220:
1.26 markus 221: void
1.22 markus 222: add_remote_forward(Options *options, u_short port, const char *host,
223: u_short host_port)
1.1 deraadt 224: {
1.17 markus 225: Forward *fwd;
226: if (options->num_remote_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
227: fatal("Too many remote forwards (max %d).",
1.93 deraadt 228: SSH_MAX_FORWARDS_PER_DIRECTION);
1.17 markus 229: fwd = &options->remote_forwards[options->num_remote_forwards++];
230: fwd->port = port;
231: fwd->host = xstrdup(host);
232: fwd->host_port = host_port;
1.1 deraadt 233: }
234:
1.90 stevesk 235: static void
236: clear_forwardings(Options *options)
237: {
238: int i;
239:
240: for (i = 0; i < options->num_local_forwards; i++)
241: xfree(options->local_forwards[i].host);
242: options->num_local_forwards = 0;
243: for (i = 0; i < options->num_remote_forwards; i++)
244: xfree(options->remote_forwards[i].host);
245: options->num_remote_forwards = 0;
246: }
247:
1.19 markus 248: /*
1.70 stevesk 249: * Returns the number of the token pointed to by cp or oBadOption.
1.19 markus 250: */
1.1 deraadt 251:
1.26 markus 252: static OpCodes
1.17 markus 253: parse_token(const char *cp, const char *filename, int linenum)
1.1 deraadt 254: {
1.51 markus 255: u_int i;
1.1 deraadt 256:
1.17 markus 257: for (i = 0; keywords[i].name; i++)
1.20 markus 258: if (strcasecmp(cp, keywords[i].name) == 0)
1.17 markus 259: return keywords[i].opcode;
260:
1.75 stevesk 261: error("%s: line %d: Bad configuration option: %s",
262: filename, linenum, cp);
1.17 markus 263: return oBadOption;
1.1 deraadt 264: }
265:
1.19 markus 266: /*
267: * Processes a single option line as used in the configuration files. This
268: * only sets those values that have not already been set.
269: */
1.102 markus 270: #define WHITESPACE " \t\r\n"
1.1 deraadt 271:
1.14 markus 272: int
273: process_config_line(Options *options, const char *host,
1.17 markus 274: char *line, const char *filename, int linenum,
275: int *activep)
1.1 deraadt 276: {
1.102 markus 277: char buf[256], *s, **charptr, *endofnumber, *keyword, *arg;
1.22 markus 278: int opcode, *intptr, value;
1.102 markus 279: size_t len;
1.22 markus 280: u_short fwd_port, fwd_host_port;
1.88 stevesk 281: char sfwd_host_port[6];
1.1 deraadt 282:
1.42 provos 283: s = line;
284: /* Get the keyword. (Each line is supposed to begin with a keyword). */
285: keyword = strdelim(&s);
286: /* Ignore leading whitespace. */
287: if (*keyword == '\0')
1.43 markus 288: keyword = strdelim(&s);
1.56 deraadt 289: if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#')
1.17 markus 290: return 0;
291:
1.38 provos 292: opcode = parse_token(keyword, filename, linenum);
1.17 markus 293:
294: switch (opcode) {
295: case oBadOption:
1.19 markus 296: /* don't panic, but count bad options */
297: return -1;
1.17 markus 298: /* NOTREACHED */
299: case oForwardAgent:
300: intptr = &options->forward_agent;
301: parse_flag:
1.42 provos 302: arg = strdelim(&s);
1.40 ho 303: if (!arg || *arg == '\0')
1.17 markus 304: fatal("%.200s line %d: Missing yes/no argument.", filename, linenum);
305: value = 0; /* To avoid compiler warning... */
1.38 provos 306: if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
1.17 markus 307: value = 1;
1.38 provos 308: else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
1.17 markus 309: value = 0;
310: else
311: fatal("%.200s line %d: Bad yes/no argument.", filename, linenum);
312: if (*activep && *intptr == -1)
313: *intptr = value;
314: break;
315:
316: case oForwardX11:
317: intptr = &options->forward_x11;
318: goto parse_flag;
319:
320: case oGatewayPorts:
321: intptr = &options->gateway_ports;
322: goto parse_flag;
323:
324: case oUsePrivilegedPort:
325: intptr = &options->use_privileged_port;
326: goto parse_flag;
327:
328: case oRhostsAuthentication:
329: intptr = &options->rhosts_authentication;
330: goto parse_flag;
331:
332: case oPasswordAuthentication:
333: intptr = &options->password_authentication;
334: goto parse_flag;
335:
1.48 markus 336: case oKbdInteractiveAuthentication:
337: intptr = &options->kbd_interactive_authentication;
338: goto parse_flag;
339:
340: case oKbdInteractiveDevices:
341: charptr = &options->kbd_interactive_devices;
342: goto parse_string;
343:
1.50 markus 344: case oPubkeyAuthentication:
345: intptr = &options->pubkey_authentication;
1.30 markus 346: goto parse_flag;
347:
1.17 markus 348: case oRSAAuthentication:
349: intptr = &options->rsa_authentication;
350: goto parse_flag;
351:
352: case oRhostsRSAAuthentication:
353: intptr = &options->rhosts_rsa_authentication;
354: goto parse_flag;
355:
1.72 markus 356: case oHostbasedAuthentication:
357: intptr = &options->hostbased_authentication;
358: goto parse_flag;
359:
1.59 markus 360: case oChallengeResponseAuthentication:
1.78 markus 361: intptr = &options->challenge_response_authentication;
1.17 markus 362: goto parse_flag;
1.82 dugsong 363: #if defined(KRB4) || defined(KRB5)
1.17 markus 364: case oKerberosAuthentication:
365: intptr = &options->kerberos_authentication;
366: goto parse_flag;
1.82 dugsong 367: #endif
368: #if defined(AFS) || defined(KRB5)
1.17 markus 369: case oKerberosTgtPassing:
370: intptr = &options->kerberos_tgt_passing;
371: goto parse_flag;
1.82 dugsong 372: #endif
373: #ifdef AFS
1.17 markus 374: case oAFSTokenPassing:
375: intptr = &options->afs_token_passing;
376: goto parse_flag;
1.1 deraadt 377: #endif
1.17 markus 378: case oBatchMode:
379: intptr = &options->batch_mode;
380: goto parse_flag;
381:
382: case oCheckHostIP:
383: intptr = &options->check_host_ip;
384: goto parse_flag;
385:
386: case oStrictHostKeyChecking:
387: intptr = &options->strict_host_key_checking;
1.42 provos 388: arg = strdelim(&s);
1.40 ho 389: if (!arg || *arg == '\0')
1.60 stevesk 390: fatal("%.200s line %d: Missing yes/no/ask argument.",
1.93 deraadt 391: filename, linenum);
1.17 markus 392: value = 0; /* To avoid compiler warning... */
1.38 provos 393: if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
1.17 markus 394: value = 1;
1.38 provos 395: else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
1.17 markus 396: value = 0;
1.38 provos 397: else if (strcmp(arg, "ask") == 0)
1.17 markus 398: value = 2;
399: else
400: fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum);
401: if (*activep && *intptr == -1)
402: *intptr = value;
403: break;
404:
405: case oCompression:
406: intptr = &options->compression;
407: goto parse_flag;
408:
409: case oKeepAlives:
410: intptr = &options->keepalives;
411: goto parse_flag;
412:
1.91 markus 413: case oNoHostAuthenticationForLocalhost:
414: intptr = &options->no_host_authentication_for_localhost;
415: goto parse_flag;
416:
1.17 markus 417: case oNumberOfPasswordPrompts:
418: intptr = &options->number_of_password_prompts;
419: goto parse_int;
420:
421: case oCompressionLevel:
422: intptr = &options->compression_level;
423: goto parse_int;
424:
1.105 ! markus 425: case oRekeyLimit:
! 426: intptr = &options->rekey_limit;
! 427: arg = strdelim(&s);
! 428: if (!arg || *arg == '\0')
! 429: fatal("%.200s line %d: Missing argument.", filename, linenum);
! 430: if (arg[0] < '0' || arg[0] > '9')
! 431: fatal("%.200s line %d: Bad number.", filename, linenum);
! 432: value = strtol(arg, &endofnumber, 10);
! 433: if (arg == endofnumber)
! 434: fatal("%.200s line %d: Bad number.", filename, linenum);
! 435: switch (toupper(*endofnumber)) {
! 436: case 'K':
! 437: value *= 1<<10;
! 438: break;
! 439: case 'M':
! 440: value *= 1<<20;
! 441: break;
! 442: case 'G':
! 443: value *= 1<<30;
! 444: break;
! 445: }
! 446: if (*activep && *intptr == -1)
! 447: *intptr = value;
! 448: break;
! 449:
1.17 markus 450: case oIdentityFile:
1.42 provos 451: arg = strdelim(&s);
1.40 ho 452: if (!arg || *arg == '\0')
1.17 markus 453: fatal("%.200s line %d: Missing argument.", filename, linenum);
454: if (*activep) {
1.50 markus 455: intptr = &options->num_identity_files;
1.27 markus 456: if (*intptr >= SSH_MAX_IDENTITY_FILES)
1.17 markus 457: fatal("%.200s line %d: Too many identity files specified (max %d).",
1.93 deraadt 458: filename, linenum, SSH_MAX_IDENTITY_FILES);
1.50 markus 459: charptr = &options->identity_files[*intptr];
1.38 provos 460: *charptr = xstrdup(arg);
1.27 markus 461: *intptr = *intptr + 1;
1.17 markus 462: }
463: break;
464:
1.34 markus 465: case oXAuthLocation:
466: charptr=&options->xauth_location;
467: goto parse_string;
468:
1.17 markus 469: case oUser:
470: charptr = &options->user;
471: parse_string:
1.42 provos 472: arg = strdelim(&s);
1.40 ho 473: if (!arg || *arg == '\0')
1.17 markus 474: fatal("%.200s line %d: Missing argument.", filename, linenum);
475: if (*activep && *charptr == NULL)
1.38 provos 476: *charptr = xstrdup(arg);
1.17 markus 477: break;
478:
479: case oGlobalKnownHostsFile:
480: charptr = &options->system_hostfile;
481: goto parse_string;
482:
483: case oUserKnownHostsFile:
484: charptr = &options->user_hostfile;
485: goto parse_string;
486:
1.27 markus 487: case oGlobalKnownHostsFile2:
488: charptr = &options->system_hostfile2;
489: goto parse_string;
490:
491: case oUserKnownHostsFile2:
492: charptr = &options->user_hostfile2;
493: goto parse_string;
494:
1.17 markus 495: case oHostName:
496: charptr = &options->hostname;
497: goto parse_string;
498:
1.52 markus 499: case oHostKeyAlias:
500: charptr = &options->host_key_alias;
501: goto parse_string;
502:
1.67 markus 503: case oPreferredAuthentications:
504: charptr = &options->preferred_authentications;
505: goto parse_string;
506:
1.77 markus 507: case oBindAddress:
508: charptr = &options->bind_address;
509: goto parse_string;
510:
1.85 jakob 511: case oSmartcardDevice:
1.86 markus 512: charptr = &options->smartcard_device;
513: goto parse_string;
1.85 jakob 514:
1.17 markus 515: case oProxyCommand:
516: charptr = &options->proxy_command;
1.102 markus 517: len = strspn(s, WHITESPACE "=");
1.17 markus 518: if (*activep && *charptr == NULL)
1.102 markus 519: *charptr = xstrdup(s + len);
1.17 markus 520: return 0;
521:
522: case oPort:
523: intptr = &options->port;
524: parse_int:
1.42 provos 525: arg = strdelim(&s);
1.40 ho 526: if (!arg || *arg == '\0')
1.17 markus 527: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 528: if (arg[0] < '0' || arg[0] > '9')
1.17 markus 529: fatal("%.200s line %d: Bad number.", filename, linenum);
1.21 markus 530:
531: /* Octal, decimal, or hex format? */
1.38 provos 532: value = strtol(arg, &endofnumber, 0);
533: if (arg == endofnumber)
1.21 markus 534: fatal("%.200s line %d: Bad number.", filename, linenum);
1.17 markus 535: if (*activep && *intptr == -1)
536: *intptr = value;
537: break;
538:
539: case oConnectionAttempts:
540: intptr = &options->connection_attempts;
541: goto parse_int;
542:
543: case oCipher:
544: intptr = &options->cipher;
1.42 provos 545: arg = strdelim(&s);
1.40 ho 546: if (!arg || *arg == '\0')
1.32 markus 547: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 548: value = cipher_number(arg);
1.17 markus 549: if (value == -1)
550: fatal("%.200s line %d: Bad cipher '%s'.",
1.93 deraadt 551: filename, linenum, arg ? arg : "<NONE>");
1.17 markus 552: if (*activep && *intptr == -1)
553: *intptr = value;
554: break;
555:
1.25 markus 556: case oCiphers:
1.42 provos 557: arg = strdelim(&s);
1.40 ho 558: if (!arg || *arg == '\0')
1.32 markus 559: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 560: if (!ciphers_valid(arg))
1.31 markus 561: fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.",
1.93 deraadt 562: filename, linenum, arg ? arg : "<NONE>");
1.25 markus 563: if (*activep && options->ciphers == NULL)
1.38 provos 564: options->ciphers = xstrdup(arg);
1.25 markus 565: break;
566:
1.62 markus 567: case oMacs:
568: arg = strdelim(&s);
569: if (!arg || *arg == '\0')
570: fatal("%.200s line %d: Missing argument.", filename, linenum);
571: if (!mac_valid(arg))
572: fatal("%.200s line %d: Bad SSH2 Mac spec '%s'.",
1.93 deraadt 573: filename, linenum, arg ? arg : "<NONE>");
1.62 markus 574: if (*activep && options->macs == NULL)
575: options->macs = xstrdup(arg);
576: break;
577:
1.76 markus 578: case oHostKeyAlgorithms:
579: arg = strdelim(&s);
580: if (!arg || *arg == '\0')
581: fatal("%.200s line %d: Missing argument.", filename, linenum);
582: if (!key_names_valid2(arg))
583: fatal("%.200s line %d: Bad protocol 2 host key algorithms '%s'.",
1.93 deraadt 584: filename, linenum, arg ? arg : "<NONE>");
1.76 markus 585: if (*activep && options->hostkeyalgorithms == NULL)
586: options->hostkeyalgorithms = xstrdup(arg);
587: break;
588:
1.25 markus 589: case oProtocol:
590: intptr = &options->protocol;
1.42 provos 591: arg = strdelim(&s);
1.40 ho 592: if (!arg || *arg == '\0')
1.32 markus 593: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 594: value = proto_spec(arg);
1.25 markus 595: if (value == SSH_PROTO_UNKNOWN)
596: fatal("%.200s line %d: Bad protocol spec '%s'.",
1.93 deraadt 597: filename, linenum, arg ? arg : "<NONE>");
1.25 markus 598: if (*activep && *intptr == SSH_PROTO_UNKNOWN)
599: *intptr = value;
600: break;
601:
1.17 markus 602: case oLogLevel:
603: intptr = (int *) &options->log_level;
1.42 provos 604: arg = strdelim(&s);
1.38 provos 605: value = log_level_number(arg);
1.95 markus 606: if (value == SYSLOG_LEVEL_NOT_SET)
1.64 millert 607: fatal("%.200s line %d: unsupported log level '%s'",
1.93 deraadt 608: filename, linenum, arg ? arg : "<NONE>");
1.95 markus 609: if (*activep && (LogLevel) *intptr == SYSLOG_LEVEL_NOT_SET)
1.17 markus 610: *intptr = (LogLevel) value;
611: break;
612:
1.88 stevesk 613: case oLocalForward:
1.17 markus 614: case oRemoteForward:
1.42 provos 615: arg = strdelim(&s);
1.40 ho 616: if (!arg || *arg == '\0')
1.88 stevesk 617: fatal("%.200s line %d: Missing port argument.",
618: filename, linenum);
619: if ((fwd_port = a2port(arg)) == 0)
620: fatal("%.200s line %d: Bad listen port.",
621: filename, linenum);
1.42 provos 622: arg = strdelim(&s);
1.40 ho 623: if (!arg || *arg == '\0')
1.17 markus 624: fatal("%.200s line %d: Missing second argument.",
1.88 stevesk 625: filename, linenum);
626: if (sscanf(arg, "%255[^:]:%5[0-9]", buf, sfwd_host_port) != 2 &&
627: sscanf(arg, "%255[^/]/%5[0-9]", buf, sfwd_host_port) != 2)
628: fatal("%.200s line %d: Bad forwarding specification.",
629: filename, linenum);
630: if ((fwd_host_port = a2port(sfwd_host_port)) == 0)
631: fatal("%.200s line %d: Bad forwarding port.",
632: filename, linenum);
633: if (*activep) {
634: if (opcode == oLocalForward)
635: add_local_forward(options, fwd_port, buf,
636: fwd_host_port);
637: else if (opcode == oRemoteForward)
638: add_remote_forward(options, fwd_port, buf,
639: fwd_host_port);
640: }
1.17 markus 641: break;
1.71 markus 642:
643: case oDynamicForward:
644: arg = strdelim(&s);
645: if (!arg || *arg == '\0')
646: fatal("%.200s line %d: Missing port argument.",
647: filename, linenum);
1.74 stevesk 648: fwd_port = a2port(arg);
649: if (fwd_port == 0)
1.71 markus 650: fatal("%.200s line %d: Badly formatted port number.",
651: filename, linenum);
1.87 markus 652: if (*activep)
653: add_local_forward(options, fwd_port, "socks4", 0);
1.72 markus 654: break;
1.17 markus 655:
1.90 stevesk 656: case oClearAllForwardings:
657: intptr = &options->clear_forwardings;
658: goto parse_flag;
659:
1.17 markus 660: case oHost:
661: *activep = 0;
1.42 provos 662: while ((arg = strdelim(&s)) != NULL && *arg != '\0')
1.38 provos 663: if (match_pattern(host, arg)) {
664: debug("Applying options for %.100s", arg);
1.17 markus 665: *activep = 1;
666: break;
667: }
1.42 provos 668: /* Avoid garbage check below, as strdelim is done. */
1.17 markus 669: return 0;
670:
671: case oEscapeChar:
672: intptr = &options->escape_char;
1.42 provos 673: arg = strdelim(&s);
1.40 ho 674: if (!arg || *arg == '\0')
1.17 markus 675: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 676: if (arg[0] == '^' && arg[2] == 0 &&
1.51 markus 677: (u_char) arg[1] >= 64 && (u_char) arg[1] < 128)
678: value = (u_char) arg[1] & 31;
1.38 provos 679: else if (strlen(arg) == 1)
1.51 markus 680: value = (u_char) arg[0];
1.38 provos 681: else if (strcmp(arg, "none") == 0)
1.79 stevesk 682: value = SSH_ESCAPECHAR_NONE;
1.17 markus 683: else {
684: fatal("%.200s line %d: Bad escape character.",
1.93 deraadt 685: filename, linenum);
1.17 markus 686: /* NOTREACHED */
687: value = 0; /* Avoid compiler warning. */
688: }
689: if (*activep && *intptr == -1)
690: *intptr = value;
691: break;
692:
1.101 markus 693: case oEnableSSHKeysign:
694: intptr = &options->enable_ssh_keysign;
695: goto parse_flag;
696:
1.96 markus 697: case oDeprecated:
1.98 markus 698: debug("%s line %d: Deprecated option \"%s\"",
1.96 markus 699: filename, linenum, keyword);
1.98 markus 700: return 0;
1.96 markus 701:
1.17 markus 702: default:
703: fatal("process_config_line: Unimplemented opcode %d", opcode);
704: }
705:
706: /* Check that there is no garbage at end of line. */
1.57 djm 707: if ((arg = strdelim(&s)) != NULL && *arg != '\0') {
1.39 ho 708: fatal("%.200s line %d: garbage at end of line; \"%.200s\".",
1.93 deraadt 709: filename, linenum, arg);
1.39 ho 710: }
1.17 markus 711: return 0;
1.1 deraadt 712: }
713:
714:
1.19 markus 715: /*
716: * Reads the config file and modifies the options accordingly. Options
717: * should already be initialized before this call. This never returns if
1.89 stevesk 718: * there is an error. If the file does not exist, this returns 0.
1.19 markus 719: */
1.1 deraadt 720:
1.89 stevesk 721: int
1.17 markus 722: read_config_file(const char *filename, const char *host, Options *options)
1.1 deraadt 723: {
1.17 markus 724: FILE *f;
725: char line[1024];
726: int active, linenum;
727: int bad_options = 0;
728:
729: /* Open the file. */
730: f = fopen(filename, "r");
731: if (!f)
1.89 stevesk 732: return 0;
1.17 markus 733:
734: debug("Reading configuration data %.200s", filename);
735:
1.19 markus 736: /*
737: * Mark that we are now processing the options. This flag is turned
738: * on/off by Host specifications.
739: */
1.17 markus 740: active = 1;
741: linenum = 0;
742: while (fgets(line, sizeof(line), f)) {
743: /* Update line number counter. */
744: linenum++;
745: if (process_config_line(options, host, line, filename, linenum, &active) != 0)
746: bad_options++;
747: }
748: fclose(f);
749: if (bad_options > 0)
1.64 millert 750: fatal("%s: terminating, %d bad configuration options",
1.93 deraadt 751: filename, bad_options);
1.89 stevesk 752: return 1;
1.1 deraadt 753: }
754:
1.19 markus 755: /*
756: * Initializes options to special values that indicate that they have not yet
757: * been set. Read_config_file will only set options with this value. Options
758: * are processed in the following order: command line, user config file,
759: * system config file. Last, fill_default_options is called.
760: */
1.1 deraadt 761:
1.26 markus 762: void
1.17 markus 763: initialize_options(Options * options)
1.1 deraadt 764: {
1.17 markus 765: memset(options, 'X', sizeof(*options));
766: options->forward_agent = -1;
767: options->forward_x11 = -1;
1.34 markus 768: options->xauth_location = NULL;
1.17 markus 769: options->gateway_ports = -1;
770: options->use_privileged_port = -1;
771: options->rhosts_authentication = -1;
772: options->rsa_authentication = -1;
1.50 markus 773: options->pubkey_authentication = -1;
1.78 markus 774: options->challenge_response_authentication = -1;
1.82 dugsong 775: #if defined(KRB4) || defined(KRB5)
1.17 markus 776: options->kerberos_authentication = -1;
1.1 deraadt 777: #endif
1.82 dugsong 778: #if defined(AFS) || defined(KRB5)
779: options->kerberos_tgt_passing = -1;
780: #endif
1.5 dugsong 781: #ifdef AFS
1.17 markus 782: options->afs_token_passing = -1;
1.1 deraadt 783: #endif
1.17 markus 784: options->password_authentication = -1;
1.48 markus 785: options->kbd_interactive_authentication = -1;
786: options->kbd_interactive_devices = NULL;
1.17 markus 787: options->rhosts_rsa_authentication = -1;
1.72 markus 788: options->hostbased_authentication = -1;
1.17 markus 789: options->batch_mode = -1;
790: options->check_host_ip = -1;
791: options->strict_host_key_checking = -1;
792: options->compression = -1;
793: options->keepalives = -1;
794: options->compression_level = -1;
795: options->port = -1;
796: options->connection_attempts = -1;
797: options->number_of_password_prompts = -1;
798: options->cipher = -1;
1.25 markus 799: options->ciphers = NULL;
1.62 markus 800: options->macs = NULL;
1.76 markus 801: options->hostkeyalgorithms = NULL;
1.25 markus 802: options->protocol = SSH_PROTO_UNKNOWN;
1.17 markus 803: options->num_identity_files = 0;
804: options->hostname = NULL;
1.52 markus 805: options->host_key_alias = NULL;
1.17 markus 806: options->proxy_command = NULL;
807: options->user = NULL;
808: options->escape_char = -1;
809: options->system_hostfile = NULL;
810: options->user_hostfile = NULL;
1.27 markus 811: options->system_hostfile2 = NULL;
812: options->user_hostfile2 = NULL;
1.17 markus 813: options->num_local_forwards = 0;
814: options->num_remote_forwards = 0;
1.90 stevesk 815: options->clear_forwardings = -1;
1.95 markus 816: options->log_level = SYSLOG_LEVEL_NOT_SET;
1.67 markus 817: options->preferred_authentications = NULL;
1.77 markus 818: options->bind_address = NULL;
1.86 markus 819: options->smartcard_device = NULL;
1.101 markus 820: options->enable_ssh_keysign = - 1;
1.91 markus 821: options->no_host_authentication_for_localhost = - 1;
1.105 ! markus 822: options->rekey_limit = - 1;
1.1 deraadt 823: }
824:
1.19 markus 825: /*
826: * Called after processing other sources of option data, this fills those
827: * options for which no value has been specified with their default values.
828: */
1.1 deraadt 829:
1.26 markus 830: void
1.17 markus 831: fill_default_options(Options * options)
1.1 deraadt 832: {
1.61 deraadt 833: int len;
834:
1.17 markus 835: if (options->forward_agent == -1)
1.33 markus 836: options->forward_agent = 0;
1.17 markus 837: if (options->forward_x11 == -1)
1.23 markus 838: options->forward_x11 = 0;
1.34 markus 839: if (options->xauth_location == NULL)
1.80 markus 840: options->xauth_location = _PATH_XAUTH;
1.17 markus 841: if (options->gateway_ports == -1)
842: options->gateway_ports = 0;
843: if (options->use_privileged_port == -1)
1.65 markus 844: options->use_privileged_port = 0;
1.17 markus 845: if (options->rhosts_authentication == -1)
1.99 stevesk 846: options->rhosts_authentication = 0;
1.17 markus 847: if (options->rsa_authentication == -1)
848: options->rsa_authentication = 1;
1.50 markus 849: if (options->pubkey_authentication == -1)
850: options->pubkey_authentication = 1;
1.78 markus 851: if (options->challenge_response_authentication == -1)
1.83 markus 852: options->challenge_response_authentication = 1;
1.82 dugsong 853: #if defined(KRB4) || defined(KRB5)
1.17 markus 854: if (options->kerberos_authentication == -1)
1.45 provos 855: options->kerberos_authentication = 1;
1.82 dugsong 856: #endif
857: #if defined(AFS) || defined(KRB5)
1.17 markus 858: if (options->kerberos_tgt_passing == -1)
859: options->kerberos_tgt_passing = 1;
1.82 dugsong 860: #endif
861: #ifdef AFS
1.17 markus 862: if (options->afs_token_passing == -1)
863: options->afs_token_passing = 1;
1.82 dugsong 864: #endif
1.17 markus 865: if (options->password_authentication == -1)
866: options->password_authentication = 1;
1.48 markus 867: if (options->kbd_interactive_authentication == -1)
1.59 markus 868: options->kbd_interactive_authentication = 1;
1.17 markus 869: if (options->rhosts_rsa_authentication == -1)
1.99 stevesk 870: options->rhosts_rsa_authentication = 0;
1.72 markus 871: if (options->hostbased_authentication == -1)
872: options->hostbased_authentication = 0;
1.17 markus 873: if (options->batch_mode == -1)
874: options->batch_mode = 0;
875: if (options->check_host_ip == -1)
876: options->check_host_ip = 1;
877: if (options->strict_host_key_checking == -1)
878: options->strict_host_key_checking = 2; /* 2 is default */
879: if (options->compression == -1)
880: options->compression = 0;
881: if (options->keepalives == -1)
882: options->keepalives = 1;
883: if (options->compression_level == -1)
884: options->compression_level = 6;
885: if (options->port == -1)
886: options->port = 0; /* Filled in ssh_connect. */
887: if (options->connection_attempts == -1)
1.84 markus 888: options->connection_attempts = 1;
1.17 markus 889: if (options->number_of_password_prompts == -1)
890: options->number_of_password_prompts = 3;
891: /* Selected in ssh_login(). */
892: if (options->cipher == -1)
893: options->cipher = SSH_CIPHER_NOT_SET;
1.31 markus 894: /* options->ciphers, default set in myproposals.h */
1.62 markus 895: /* options->macs, default set in myproposals.h */
1.76 markus 896: /* options->hostkeyalgorithms, default set in myproposals.h */
1.25 markus 897: if (options->protocol == SSH_PROTO_UNKNOWN)
1.69 markus 898: options->protocol = SSH_PROTO_1|SSH_PROTO_2;
1.17 markus 899: if (options->num_identity_files == 0) {
1.50 markus 900: if (options->protocol & SSH_PROTO_1) {
1.61 deraadt 901: len = 2 + strlen(_PATH_SSH_CLIENT_IDENTITY) + 1;
1.50 markus 902: options->identity_files[options->num_identity_files] =
1.61 deraadt 903: xmalloc(len);
904: snprintf(options->identity_files[options->num_identity_files++],
905: len, "~/%.100s", _PATH_SSH_CLIENT_IDENTITY);
1.50 markus 906: }
907: if (options->protocol & SSH_PROTO_2) {
1.63 deraadt 908: len = 2 + strlen(_PATH_SSH_CLIENT_ID_RSA) + 1;
909: options->identity_files[options->num_identity_files] =
910: xmalloc(len);
911: snprintf(options->identity_files[options->num_identity_files++],
912: len, "~/%.100s", _PATH_SSH_CLIENT_ID_RSA);
913:
1.61 deraadt 914: len = 2 + strlen(_PATH_SSH_CLIENT_ID_DSA) + 1;
1.50 markus 915: options->identity_files[options->num_identity_files] =
1.61 deraadt 916: xmalloc(len);
917: snprintf(options->identity_files[options->num_identity_files++],
918: len, "~/%.100s", _PATH_SSH_CLIENT_ID_DSA);
1.50 markus 919: }
1.27 markus 920: }
1.17 markus 921: if (options->escape_char == -1)
922: options->escape_char = '~';
923: if (options->system_hostfile == NULL)
1.55 markus 924: options->system_hostfile = _PATH_SSH_SYSTEM_HOSTFILE;
1.17 markus 925: if (options->user_hostfile == NULL)
1.55 markus 926: options->user_hostfile = _PATH_SSH_USER_HOSTFILE;
1.27 markus 927: if (options->system_hostfile2 == NULL)
1.55 markus 928: options->system_hostfile2 = _PATH_SSH_SYSTEM_HOSTFILE2;
1.27 markus 929: if (options->user_hostfile2 == NULL)
1.55 markus 930: options->user_hostfile2 = _PATH_SSH_USER_HOSTFILE2;
1.95 markus 931: if (options->log_level == SYSLOG_LEVEL_NOT_SET)
1.54 markus 932: options->log_level = SYSLOG_LEVEL_INFO;
1.90 stevesk 933: if (options->clear_forwardings == 1)
934: clear_forwardings(options);
1.91 markus 935: if (options->no_host_authentication_for_localhost == - 1)
936: options->no_host_authentication_for_localhost = 0;
1.101 markus 937: if (options->enable_ssh_keysign == -1)
938: options->enable_ssh_keysign = 0;
1.105 ! markus 939: if (options->rekey_limit == -1)
! 940: options->rekey_limit = 0;
1.17 markus 941: /* options->proxy_command should not be set by default */
942: /* options->user will be set in the main program if appropriate */
943: /* options->hostname will be set in the main program if appropriate */
1.52 markus 944: /* options->host_key_alias should not be set by default */
1.67 markus 945: /* options->preferred_authentications will be set in ssh */
1.1 deraadt 946: }
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