Annotation of src/usr.bin/ssh/readconf.c, Revision 1.110
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"
1.110 ! jakob 15: RCSID("$OpenBSD: readconf.c,v 1.109 2003/05/15 04:08:44 jakob 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,
1.108 jakob 97: oKerberosAuthentication, oKerberosTgtPassing, oAFSTokenPassing,
1.17 markus 98: oIdentityFile, oHostName, oPort, oCipher, oRemoteForward, oLocalForward,
99: oUser, oHost, oEscapeChar, oRhostsRSAAuthentication, oProxyCommand,
100: oGlobalKnownHostsFile, oUserKnownHostsFile, oConnectionAttempts,
101: oBatchMode, oCheckHostIP, oStrictHostKeyChecking, oCompression,
1.59 markus 102: oCompressionLevel, oKeepAlives, oNumberOfPasswordPrompts,
1.62 markus 103: oUsePrivilegedPort, oLogLevel, oCiphers, oProtocol, oMacs,
1.50 markus 104: oGlobalKnownHostsFile2, oUserKnownHostsFile2, oPubkeyAuthentication,
1.67 markus 105: oKbdInteractiveAuthentication, oKbdInteractiveDevices, oHostKeyAlias,
1.76 markus 106: oDynamicForward, oPreferredAuthentications, oHostbasedAuthentication,
1.90 stevesk 107: oHostKeyAlgorithms, oBindAddress, oSmartcardDevice,
1.96 markus 108: oClearAllForwardings, oNoHostAuthenticationForLocalhost,
1.107 jakob 109: oEnableSSHKeysign, oRekeyLimit, oVerifyHostKeyDNS,
1.110 ! jakob 110: oDeprecated, oUnsupported
1.1 deraadt 111: } OpCodes;
112:
113: /* Textual representations of the tokens. */
114:
1.17 markus 115: static struct {
116: const char *name;
117: OpCodes opcode;
118: } keywords[] = {
119: { "forwardagent", oForwardAgent },
120: { "forwardx11", oForwardX11 },
1.34 markus 121: { "xauthlocation", oXAuthLocation },
1.17 markus 122: { "gatewayports", oGatewayPorts },
123: { "useprivilegedport", oUsePrivilegedPort },
124: { "rhostsauthentication", oRhostsAuthentication },
125: { "passwordauthentication", oPasswordAuthentication },
1.48 markus 126: { "kbdinteractiveauthentication", oKbdInteractiveAuthentication },
127: { "kbdinteractivedevices", oKbdInteractiveDevices },
1.17 markus 128: { "rsaauthentication", oRSAAuthentication },
1.50 markus 129: { "pubkeyauthentication", oPubkeyAuthentication },
1.59 markus 130: { "dsaauthentication", oPubkeyAuthentication }, /* alias */
1.72 markus 131: { "rhostsrsaauthentication", oRhostsRSAAuthentication },
1.73 markus 132: { "hostbasedauthentication", oHostbasedAuthentication },
1.59 markus 133: { "challengeresponseauthentication", oChallengeResponseAuthentication },
134: { "skeyauthentication", oChallengeResponseAuthentication }, /* alias */
135: { "tisauthentication", oChallengeResponseAuthentication }, /* alias */
1.110 ! jakob 136: #if defined(KRB4) || defined(KRB5)
1.17 markus 137: { "kerberosauthentication", oKerberosAuthentication },
1.82 dugsong 138: { "kerberostgtpassing", oKerberosTgtPassing },
1.110 ! jakob 139: #else
! 140: { "kerberosauthentication", oUnsupported },
! 141: { "kerberostgtpassing", oUnsupported },
! 142: #endif
! 143: #if defined(AFS)
1.17 markus 144: { "afstokenpassing", oAFSTokenPassing },
1.110 ! jakob 145: #else
! 146: { "afstokenpassing", oUnsupported },
! 147: #endif
1.96 markus 148: { "fallbacktorsh", oDeprecated },
149: { "usersh", oDeprecated },
1.17 markus 150: { "identityfile", oIdentityFile },
1.50 markus 151: { "identityfile2", oIdentityFile }, /* alias */
1.17 markus 152: { "hostname", oHostName },
1.52 markus 153: { "hostkeyalias", oHostKeyAlias },
1.17 markus 154: { "proxycommand", oProxyCommand },
155: { "port", oPort },
156: { "cipher", oCipher },
1.25 markus 157: { "ciphers", oCiphers },
1.62 markus 158: { "macs", oMacs },
1.25 markus 159: { "protocol", oProtocol },
1.17 markus 160: { "remoteforward", oRemoteForward },
161: { "localforward", oLocalForward },
162: { "user", oUser },
163: { "host", oHost },
164: { "escapechar", oEscapeChar },
165: { "globalknownhostsfile", oGlobalKnownHostsFile },
1.81 markus 166: { "userknownhostsfile", oUserKnownHostsFile }, /* obsolete */
1.27 markus 167: { "globalknownhostsfile2", oGlobalKnownHostsFile2 },
1.81 markus 168: { "userknownhostsfile2", oUserKnownHostsFile2 }, /* obsolete */
1.17 markus 169: { "connectionattempts", oConnectionAttempts },
170: { "batchmode", oBatchMode },
171: { "checkhostip", oCheckHostIP },
172: { "stricthostkeychecking", oStrictHostKeyChecking },
173: { "compression", oCompression },
174: { "compressionlevel", oCompressionLevel },
175: { "keepalive", oKeepAlives },
176: { "numberofpasswordprompts", oNumberOfPasswordPrompts },
177: { "loglevel", oLogLevel },
1.71 markus 178: { "dynamicforward", oDynamicForward },
1.67 markus 179: { "preferredauthentications", oPreferredAuthentications },
1.76 markus 180: { "hostkeyalgorithms", oHostKeyAlgorithms },
1.77 markus 181: { "bindaddress", oBindAddress },
1.110 ! jakob 182: #ifdef SMARTCARD
1.85 jakob 183: { "smartcarddevice", oSmartcardDevice },
1.110 ! jakob 184: #else
! 185: { "smartcarddevice", oUnsupported },
! 186: #endif
1.93 deraadt 187: { "clearallforwardings", oClearAllForwardings },
1.101 markus 188: { "enablesshkeysign", oEnableSSHKeysign },
1.110 ! jakob 189: #ifdef DNS
1.107 jakob 190: { "verifyhostkeydns", oVerifyHostKeyDNS },
1.110 ! jakob 191: #else
! 192: { "verifyhostkeydns", oUnsupported },
! 193: #endif
1.93 deraadt 194: { "nohostauthenticationforlocalhost", oNoHostAuthenticationForLocalhost },
1.105 markus 195: { "rekeylimit", oRekeyLimit },
1.92 stevesk 196: { NULL, oBadOption }
1.13 markus 197: };
198:
1.19 markus 199: /*
200: * Adds a local TCP/IP port forward to options. Never returns if there is an
201: * error.
202: */
1.1 deraadt 203:
1.26 markus 204: void
1.22 markus 205: add_local_forward(Options *options, u_short port, const char *host,
206: u_short host_port)
1.1 deraadt 207: {
1.17 markus 208: Forward *fwd;
209: extern uid_t original_real_uid;
210: if (port < IPPORT_RESERVED && original_real_uid != 0)
1.64 millert 211: fatal("Privileged ports can only be forwarded by root.");
1.17 markus 212: if (options->num_local_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
213: fatal("Too many local forwards (max %d).", SSH_MAX_FORWARDS_PER_DIRECTION);
214: fwd = &options->local_forwards[options->num_local_forwards++];
215: fwd->port = port;
216: fwd->host = xstrdup(host);
217: fwd->host_port = host_port;
1.1 deraadt 218: }
219:
1.19 markus 220: /*
221: * Adds a remote TCP/IP port forward to options. Never returns if there is
222: * an error.
223: */
1.1 deraadt 224:
1.26 markus 225: void
1.22 markus 226: add_remote_forward(Options *options, u_short port, const char *host,
227: u_short host_port)
1.1 deraadt 228: {
1.17 markus 229: Forward *fwd;
230: if (options->num_remote_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
231: fatal("Too many remote forwards (max %d).",
1.93 deraadt 232: SSH_MAX_FORWARDS_PER_DIRECTION);
1.17 markus 233: fwd = &options->remote_forwards[options->num_remote_forwards++];
234: fwd->port = port;
235: fwd->host = xstrdup(host);
236: fwd->host_port = host_port;
1.1 deraadt 237: }
238:
1.90 stevesk 239: static void
240: clear_forwardings(Options *options)
241: {
242: int i;
243:
244: for (i = 0; i < options->num_local_forwards; i++)
245: xfree(options->local_forwards[i].host);
246: options->num_local_forwards = 0;
247: for (i = 0; i < options->num_remote_forwards; i++)
248: xfree(options->remote_forwards[i].host);
249: options->num_remote_forwards = 0;
250: }
251:
1.19 markus 252: /*
1.70 stevesk 253: * Returns the number of the token pointed to by cp or oBadOption.
1.19 markus 254: */
1.1 deraadt 255:
1.26 markus 256: static OpCodes
1.17 markus 257: parse_token(const char *cp, const char *filename, int linenum)
1.1 deraadt 258: {
1.51 markus 259: u_int i;
1.1 deraadt 260:
1.17 markus 261: for (i = 0; keywords[i].name; i++)
1.20 markus 262: if (strcasecmp(cp, keywords[i].name) == 0)
1.17 markus 263: return keywords[i].opcode;
264:
1.75 stevesk 265: error("%s: line %d: Bad configuration option: %s",
266: filename, linenum, cp);
1.17 markus 267: return oBadOption;
1.1 deraadt 268: }
269:
1.19 markus 270: /*
271: * Processes a single option line as used in the configuration files. This
272: * only sets those values that have not already been set.
273: */
1.102 markus 274: #define WHITESPACE " \t\r\n"
1.1 deraadt 275:
1.14 markus 276: int
277: process_config_line(Options *options, const char *host,
1.17 markus 278: char *line, const char *filename, int linenum,
279: int *activep)
1.1 deraadt 280: {
1.102 markus 281: char buf[256], *s, **charptr, *endofnumber, *keyword, *arg;
1.22 markus 282: int opcode, *intptr, value;
1.102 markus 283: size_t len;
1.22 markus 284: u_short fwd_port, fwd_host_port;
1.88 stevesk 285: char sfwd_host_port[6];
1.106 djm 286:
287: /* Strip trailing whitespace */
288: for(len = strlen(line) - 1; len > 0; len--) {
289: if (strchr(WHITESPACE, line[len]) == NULL)
290: break;
291: line[len] = '\0';
292: }
1.1 deraadt 293:
1.42 provos 294: s = line;
295: /* Get the keyword. (Each line is supposed to begin with a keyword). */
296: keyword = strdelim(&s);
297: /* Ignore leading whitespace. */
298: if (*keyword == '\0')
1.43 markus 299: keyword = strdelim(&s);
1.56 deraadt 300: if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#')
1.17 markus 301: return 0;
302:
1.38 provos 303: opcode = parse_token(keyword, filename, linenum);
1.17 markus 304:
305: switch (opcode) {
306: case oBadOption:
1.19 markus 307: /* don't panic, but count bad options */
308: return -1;
1.17 markus 309: /* NOTREACHED */
310: case oForwardAgent:
311: intptr = &options->forward_agent;
312: parse_flag:
1.42 provos 313: arg = strdelim(&s);
1.40 ho 314: if (!arg || *arg == '\0')
1.17 markus 315: fatal("%.200s line %d: Missing yes/no argument.", filename, linenum);
316: value = 0; /* To avoid compiler warning... */
1.38 provos 317: if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
1.17 markus 318: value = 1;
1.38 provos 319: else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
1.17 markus 320: value = 0;
321: else
322: fatal("%.200s line %d: Bad yes/no argument.", filename, linenum);
323: if (*activep && *intptr == -1)
324: *intptr = value;
325: break;
326:
327: case oForwardX11:
328: intptr = &options->forward_x11;
329: goto parse_flag;
330:
331: case oGatewayPorts:
332: intptr = &options->gateway_ports;
333: goto parse_flag;
334:
335: case oUsePrivilegedPort:
336: intptr = &options->use_privileged_port;
337: goto parse_flag;
338:
339: case oRhostsAuthentication:
340: intptr = &options->rhosts_authentication;
341: goto parse_flag;
342:
343: case oPasswordAuthentication:
344: intptr = &options->password_authentication;
345: goto parse_flag;
346:
1.48 markus 347: case oKbdInteractiveAuthentication:
348: intptr = &options->kbd_interactive_authentication;
349: goto parse_flag;
350:
351: case oKbdInteractiveDevices:
352: charptr = &options->kbd_interactive_devices;
353: goto parse_string;
354:
1.50 markus 355: case oPubkeyAuthentication:
356: intptr = &options->pubkey_authentication;
1.30 markus 357: goto parse_flag;
358:
1.17 markus 359: case oRSAAuthentication:
360: intptr = &options->rsa_authentication;
361: goto parse_flag;
362:
363: case oRhostsRSAAuthentication:
364: intptr = &options->rhosts_rsa_authentication;
365: goto parse_flag;
366:
1.72 markus 367: case oHostbasedAuthentication:
368: intptr = &options->hostbased_authentication;
369: goto parse_flag;
370:
1.59 markus 371: case oChallengeResponseAuthentication:
1.78 markus 372: intptr = &options->challenge_response_authentication;
1.17 markus 373: goto parse_flag;
1.108 jakob 374:
1.17 markus 375: case oKerberosAuthentication:
376: intptr = &options->kerberos_authentication;
377: goto parse_flag;
1.108 jakob 378:
1.17 markus 379: case oKerberosTgtPassing:
380: intptr = &options->kerberos_tgt_passing;
381: goto parse_flag;
1.108 jakob 382:
1.17 markus 383: case oAFSTokenPassing:
384: intptr = &options->afs_token_passing;
385: goto parse_flag;
1.108 jakob 386:
1.17 markus 387: case oBatchMode:
388: intptr = &options->batch_mode;
389: goto parse_flag;
390:
391: case oCheckHostIP:
392: intptr = &options->check_host_ip;
393: goto parse_flag;
394:
1.107 jakob 395: case oVerifyHostKeyDNS:
396: intptr = &options->verify_host_key_dns;
397: goto parse_flag;
398:
1.17 markus 399: case oStrictHostKeyChecking:
400: intptr = &options->strict_host_key_checking;
1.42 provos 401: arg = strdelim(&s);
1.40 ho 402: if (!arg || *arg == '\0')
1.60 stevesk 403: fatal("%.200s line %d: Missing yes/no/ask argument.",
1.93 deraadt 404: filename, linenum);
1.17 markus 405: value = 0; /* To avoid compiler warning... */
1.38 provos 406: if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
1.17 markus 407: value = 1;
1.38 provos 408: else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
1.17 markus 409: value = 0;
1.38 provos 410: else if (strcmp(arg, "ask") == 0)
1.17 markus 411: value = 2;
412: else
413: fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum);
414: if (*activep && *intptr == -1)
415: *intptr = value;
416: break;
417:
418: case oCompression:
419: intptr = &options->compression;
420: goto parse_flag;
421:
422: case oKeepAlives:
423: intptr = &options->keepalives;
424: goto parse_flag;
425:
1.91 markus 426: case oNoHostAuthenticationForLocalhost:
427: intptr = &options->no_host_authentication_for_localhost;
428: goto parse_flag;
429:
1.17 markus 430: case oNumberOfPasswordPrompts:
431: intptr = &options->number_of_password_prompts;
432: goto parse_int;
433:
434: case oCompressionLevel:
435: intptr = &options->compression_level;
436: goto parse_int;
437:
1.105 markus 438: case oRekeyLimit:
439: intptr = &options->rekey_limit;
440: arg = strdelim(&s);
441: if (!arg || *arg == '\0')
442: fatal("%.200s line %d: Missing argument.", filename, linenum);
443: if (arg[0] < '0' || arg[0] > '9')
444: fatal("%.200s line %d: Bad number.", filename, linenum);
445: value = strtol(arg, &endofnumber, 10);
446: if (arg == endofnumber)
447: fatal("%.200s line %d: Bad number.", filename, linenum);
448: switch (toupper(*endofnumber)) {
449: case 'K':
450: value *= 1<<10;
451: break;
452: case 'M':
453: value *= 1<<20;
454: break;
455: case 'G':
456: value *= 1<<30;
457: break;
458: }
459: if (*activep && *intptr == -1)
460: *intptr = value;
461: break;
462:
1.17 markus 463: case oIdentityFile:
1.42 provos 464: arg = strdelim(&s);
1.40 ho 465: if (!arg || *arg == '\0')
1.17 markus 466: fatal("%.200s line %d: Missing argument.", filename, linenum);
467: if (*activep) {
1.50 markus 468: intptr = &options->num_identity_files;
1.27 markus 469: if (*intptr >= SSH_MAX_IDENTITY_FILES)
1.17 markus 470: fatal("%.200s line %d: Too many identity files specified (max %d).",
1.93 deraadt 471: filename, linenum, SSH_MAX_IDENTITY_FILES);
1.50 markus 472: charptr = &options->identity_files[*intptr];
1.38 provos 473: *charptr = xstrdup(arg);
1.27 markus 474: *intptr = *intptr + 1;
1.17 markus 475: }
476: break;
477:
1.34 markus 478: case oXAuthLocation:
479: charptr=&options->xauth_location;
480: goto parse_string;
481:
1.17 markus 482: case oUser:
483: charptr = &options->user;
484: parse_string:
1.42 provos 485: arg = strdelim(&s);
1.40 ho 486: if (!arg || *arg == '\0')
1.17 markus 487: fatal("%.200s line %d: Missing argument.", filename, linenum);
488: if (*activep && *charptr == NULL)
1.38 provos 489: *charptr = xstrdup(arg);
1.17 markus 490: break;
491:
492: case oGlobalKnownHostsFile:
493: charptr = &options->system_hostfile;
494: goto parse_string;
495:
496: case oUserKnownHostsFile:
497: charptr = &options->user_hostfile;
498: goto parse_string;
499:
1.27 markus 500: case oGlobalKnownHostsFile2:
501: charptr = &options->system_hostfile2;
502: goto parse_string;
503:
504: case oUserKnownHostsFile2:
505: charptr = &options->user_hostfile2;
506: goto parse_string;
507:
1.17 markus 508: case oHostName:
509: charptr = &options->hostname;
510: goto parse_string;
511:
1.52 markus 512: case oHostKeyAlias:
513: charptr = &options->host_key_alias;
514: goto parse_string;
515:
1.67 markus 516: case oPreferredAuthentications:
517: charptr = &options->preferred_authentications;
518: goto parse_string;
519:
1.77 markus 520: case oBindAddress:
521: charptr = &options->bind_address;
522: goto parse_string;
523:
1.85 jakob 524: case oSmartcardDevice:
1.86 markus 525: charptr = &options->smartcard_device;
526: goto parse_string;
1.85 jakob 527:
1.17 markus 528: case oProxyCommand:
529: charptr = &options->proxy_command;
1.102 markus 530: len = strspn(s, WHITESPACE "=");
1.17 markus 531: if (*activep && *charptr == NULL)
1.102 markus 532: *charptr = xstrdup(s + len);
1.17 markus 533: return 0;
534:
535: case oPort:
536: intptr = &options->port;
537: parse_int:
1.42 provos 538: arg = strdelim(&s);
1.40 ho 539: if (!arg || *arg == '\0')
1.17 markus 540: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 541: if (arg[0] < '0' || arg[0] > '9')
1.17 markus 542: fatal("%.200s line %d: Bad number.", filename, linenum);
1.21 markus 543:
544: /* Octal, decimal, or hex format? */
1.38 provos 545: value = strtol(arg, &endofnumber, 0);
546: if (arg == endofnumber)
1.21 markus 547: fatal("%.200s line %d: Bad number.", filename, linenum);
1.17 markus 548: if (*activep && *intptr == -1)
549: *intptr = value;
550: break;
551:
552: case oConnectionAttempts:
553: intptr = &options->connection_attempts;
554: goto parse_int;
555:
556: case oCipher:
557: intptr = &options->cipher;
1.42 provos 558: arg = strdelim(&s);
1.40 ho 559: if (!arg || *arg == '\0')
1.32 markus 560: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 561: value = cipher_number(arg);
1.17 markus 562: if (value == -1)
563: fatal("%.200s line %d: Bad cipher '%s'.",
1.93 deraadt 564: filename, linenum, arg ? arg : "<NONE>");
1.17 markus 565: if (*activep && *intptr == -1)
566: *intptr = value;
567: break;
568:
1.25 markus 569: case oCiphers:
1.42 provos 570: arg = strdelim(&s);
1.40 ho 571: if (!arg || *arg == '\0')
1.32 markus 572: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 573: if (!ciphers_valid(arg))
1.31 markus 574: fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.",
1.93 deraadt 575: filename, linenum, arg ? arg : "<NONE>");
1.25 markus 576: if (*activep && options->ciphers == NULL)
1.38 provos 577: options->ciphers = xstrdup(arg);
1.25 markus 578: break;
579:
1.62 markus 580: case oMacs:
581: arg = strdelim(&s);
582: if (!arg || *arg == '\0')
583: fatal("%.200s line %d: Missing argument.", filename, linenum);
584: if (!mac_valid(arg))
585: fatal("%.200s line %d: Bad SSH2 Mac spec '%s'.",
1.93 deraadt 586: filename, linenum, arg ? arg : "<NONE>");
1.62 markus 587: if (*activep && options->macs == NULL)
588: options->macs = xstrdup(arg);
589: break;
590:
1.76 markus 591: case oHostKeyAlgorithms:
592: arg = strdelim(&s);
593: if (!arg || *arg == '\0')
594: fatal("%.200s line %d: Missing argument.", filename, linenum);
595: if (!key_names_valid2(arg))
596: fatal("%.200s line %d: Bad protocol 2 host key algorithms '%s'.",
1.93 deraadt 597: filename, linenum, arg ? arg : "<NONE>");
1.76 markus 598: if (*activep && options->hostkeyalgorithms == NULL)
599: options->hostkeyalgorithms = xstrdup(arg);
600: break;
601:
1.25 markus 602: case oProtocol:
603: intptr = &options->protocol;
1.42 provos 604: arg = strdelim(&s);
1.40 ho 605: if (!arg || *arg == '\0')
1.32 markus 606: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 607: value = proto_spec(arg);
1.25 markus 608: if (value == SSH_PROTO_UNKNOWN)
609: fatal("%.200s line %d: Bad protocol spec '%s'.",
1.93 deraadt 610: filename, linenum, arg ? arg : "<NONE>");
1.25 markus 611: if (*activep && *intptr == SSH_PROTO_UNKNOWN)
612: *intptr = value;
613: break;
614:
1.17 markus 615: case oLogLevel:
616: intptr = (int *) &options->log_level;
1.42 provos 617: arg = strdelim(&s);
1.38 provos 618: value = log_level_number(arg);
1.95 markus 619: if (value == SYSLOG_LEVEL_NOT_SET)
1.64 millert 620: fatal("%.200s line %d: unsupported log level '%s'",
1.93 deraadt 621: filename, linenum, arg ? arg : "<NONE>");
1.95 markus 622: if (*activep && (LogLevel) *intptr == SYSLOG_LEVEL_NOT_SET)
1.17 markus 623: *intptr = (LogLevel) value;
624: break;
625:
1.88 stevesk 626: case oLocalForward:
1.17 markus 627: case oRemoteForward:
1.42 provos 628: arg = strdelim(&s);
1.40 ho 629: if (!arg || *arg == '\0')
1.88 stevesk 630: fatal("%.200s line %d: Missing port argument.",
631: filename, linenum);
632: if ((fwd_port = a2port(arg)) == 0)
633: fatal("%.200s line %d: Bad listen port.",
634: filename, linenum);
1.42 provos 635: arg = strdelim(&s);
1.40 ho 636: if (!arg || *arg == '\0')
1.17 markus 637: fatal("%.200s line %d: Missing second argument.",
1.88 stevesk 638: filename, linenum);
639: if (sscanf(arg, "%255[^:]:%5[0-9]", buf, sfwd_host_port) != 2 &&
640: sscanf(arg, "%255[^/]/%5[0-9]", buf, sfwd_host_port) != 2)
641: fatal("%.200s line %d: Bad forwarding specification.",
642: filename, linenum);
643: if ((fwd_host_port = a2port(sfwd_host_port)) == 0)
644: fatal("%.200s line %d: Bad forwarding port.",
645: filename, linenum);
646: if (*activep) {
647: if (opcode == oLocalForward)
648: add_local_forward(options, fwd_port, buf,
649: fwd_host_port);
650: else if (opcode == oRemoteForward)
651: add_remote_forward(options, fwd_port, buf,
652: fwd_host_port);
653: }
1.17 markus 654: break;
1.71 markus 655:
656: case oDynamicForward:
657: arg = strdelim(&s);
658: if (!arg || *arg == '\0')
659: fatal("%.200s line %d: Missing port argument.",
660: filename, linenum);
1.74 stevesk 661: fwd_port = a2port(arg);
662: if (fwd_port == 0)
1.71 markus 663: fatal("%.200s line %d: Badly formatted port number.",
664: filename, linenum);
1.87 markus 665: if (*activep)
666: add_local_forward(options, fwd_port, "socks4", 0);
1.72 markus 667: break;
1.17 markus 668:
1.90 stevesk 669: case oClearAllForwardings:
670: intptr = &options->clear_forwardings;
671: goto parse_flag;
672:
1.17 markus 673: case oHost:
674: *activep = 0;
1.42 provos 675: while ((arg = strdelim(&s)) != NULL && *arg != '\0')
1.38 provos 676: if (match_pattern(host, arg)) {
677: debug("Applying options for %.100s", arg);
1.17 markus 678: *activep = 1;
679: break;
680: }
1.42 provos 681: /* Avoid garbage check below, as strdelim is done. */
1.17 markus 682: return 0;
683:
684: case oEscapeChar:
685: intptr = &options->escape_char;
1.42 provos 686: arg = strdelim(&s);
1.40 ho 687: if (!arg || *arg == '\0')
1.17 markus 688: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 689: if (arg[0] == '^' && arg[2] == 0 &&
1.51 markus 690: (u_char) arg[1] >= 64 && (u_char) arg[1] < 128)
691: value = (u_char) arg[1] & 31;
1.38 provos 692: else if (strlen(arg) == 1)
1.51 markus 693: value = (u_char) arg[0];
1.38 provos 694: else if (strcmp(arg, "none") == 0)
1.79 stevesk 695: value = SSH_ESCAPECHAR_NONE;
1.17 markus 696: else {
697: fatal("%.200s line %d: Bad escape character.",
1.93 deraadt 698: filename, linenum);
1.17 markus 699: /* NOTREACHED */
700: value = 0; /* Avoid compiler warning. */
701: }
702: if (*activep && *intptr == -1)
703: *intptr = value;
704: break;
705:
1.101 markus 706: case oEnableSSHKeysign:
707: intptr = &options->enable_ssh_keysign;
708: goto parse_flag;
709:
1.96 markus 710: case oDeprecated:
1.98 markus 711: debug("%s line %d: Deprecated option \"%s\"",
1.96 markus 712: filename, linenum, keyword);
1.98 markus 713: return 0;
1.96 markus 714:
1.110 ! jakob 715: case oUnsupported:
! 716: error("%s line %d: Unsupported option \"%s\"",
! 717: filename, linenum, keyword);
! 718: return 0;
! 719:
1.17 markus 720: default:
721: fatal("process_config_line: Unimplemented opcode %d", opcode);
722: }
723:
724: /* Check that there is no garbage at end of line. */
1.57 djm 725: if ((arg = strdelim(&s)) != NULL && *arg != '\0') {
1.39 ho 726: fatal("%.200s line %d: garbage at end of line; \"%.200s\".",
1.93 deraadt 727: filename, linenum, arg);
1.39 ho 728: }
1.17 markus 729: return 0;
1.1 deraadt 730: }
731:
732:
1.19 markus 733: /*
734: * Reads the config file and modifies the options accordingly. Options
735: * should already be initialized before this call. This never returns if
1.89 stevesk 736: * there is an error. If the file does not exist, this returns 0.
1.19 markus 737: */
1.1 deraadt 738:
1.89 stevesk 739: int
1.17 markus 740: read_config_file(const char *filename, const char *host, Options *options)
1.1 deraadt 741: {
1.17 markus 742: FILE *f;
743: char line[1024];
744: int active, linenum;
745: int bad_options = 0;
746:
747: /* Open the file. */
748: f = fopen(filename, "r");
749: if (!f)
1.89 stevesk 750: return 0;
1.17 markus 751:
752: debug("Reading configuration data %.200s", filename);
753:
1.19 markus 754: /*
755: * Mark that we are now processing the options. This flag is turned
756: * on/off by Host specifications.
757: */
1.17 markus 758: active = 1;
759: linenum = 0;
760: while (fgets(line, sizeof(line), f)) {
761: /* Update line number counter. */
762: linenum++;
763: if (process_config_line(options, host, line, filename, linenum, &active) != 0)
764: bad_options++;
765: }
766: fclose(f);
767: if (bad_options > 0)
1.64 millert 768: fatal("%s: terminating, %d bad configuration options",
1.93 deraadt 769: filename, bad_options);
1.89 stevesk 770: return 1;
1.1 deraadt 771: }
772:
1.19 markus 773: /*
774: * Initializes options to special values that indicate that they have not yet
775: * been set. Read_config_file will only set options with this value. Options
776: * are processed in the following order: command line, user config file,
777: * system config file. Last, fill_default_options is called.
778: */
1.1 deraadt 779:
1.26 markus 780: void
1.17 markus 781: initialize_options(Options * options)
1.1 deraadt 782: {
1.17 markus 783: memset(options, 'X', sizeof(*options));
784: options->forward_agent = -1;
785: options->forward_x11 = -1;
1.34 markus 786: options->xauth_location = NULL;
1.17 markus 787: options->gateway_ports = -1;
788: options->use_privileged_port = -1;
789: options->rhosts_authentication = -1;
790: options->rsa_authentication = -1;
1.50 markus 791: options->pubkey_authentication = -1;
1.78 markus 792: options->challenge_response_authentication = -1;
1.17 markus 793: options->kerberos_authentication = -1;
1.82 dugsong 794: options->kerberos_tgt_passing = -1;
1.17 markus 795: options->afs_token_passing = -1;
796: options->password_authentication = -1;
1.48 markus 797: options->kbd_interactive_authentication = -1;
798: options->kbd_interactive_devices = NULL;
1.17 markus 799: options->rhosts_rsa_authentication = -1;
1.72 markus 800: options->hostbased_authentication = -1;
1.17 markus 801: options->batch_mode = -1;
802: options->check_host_ip = -1;
803: options->strict_host_key_checking = -1;
804: options->compression = -1;
805: options->keepalives = -1;
806: options->compression_level = -1;
807: options->port = -1;
808: options->connection_attempts = -1;
809: options->number_of_password_prompts = -1;
810: options->cipher = -1;
1.25 markus 811: options->ciphers = NULL;
1.62 markus 812: options->macs = NULL;
1.76 markus 813: options->hostkeyalgorithms = NULL;
1.25 markus 814: options->protocol = SSH_PROTO_UNKNOWN;
1.17 markus 815: options->num_identity_files = 0;
816: options->hostname = NULL;
1.52 markus 817: options->host_key_alias = NULL;
1.17 markus 818: options->proxy_command = NULL;
819: options->user = NULL;
820: options->escape_char = -1;
821: options->system_hostfile = NULL;
822: options->user_hostfile = NULL;
1.27 markus 823: options->system_hostfile2 = NULL;
824: options->user_hostfile2 = NULL;
1.17 markus 825: options->num_local_forwards = 0;
826: options->num_remote_forwards = 0;
1.90 stevesk 827: options->clear_forwardings = -1;
1.95 markus 828: options->log_level = SYSLOG_LEVEL_NOT_SET;
1.67 markus 829: options->preferred_authentications = NULL;
1.77 markus 830: options->bind_address = NULL;
1.86 markus 831: options->smartcard_device = NULL;
1.101 markus 832: options->enable_ssh_keysign = - 1;
1.91 markus 833: options->no_host_authentication_for_localhost = - 1;
1.105 markus 834: options->rekey_limit = - 1;
1.107 jakob 835: options->verify_host_key_dns = -1;
1.1 deraadt 836: }
837:
1.19 markus 838: /*
839: * Called after processing other sources of option data, this fills those
840: * options for which no value has been specified with their default values.
841: */
1.1 deraadt 842:
1.26 markus 843: void
1.17 markus 844: fill_default_options(Options * options)
1.1 deraadt 845: {
1.61 deraadt 846: int len;
847:
1.17 markus 848: if (options->forward_agent == -1)
1.33 markus 849: options->forward_agent = 0;
1.17 markus 850: if (options->forward_x11 == -1)
1.23 markus 851: options->forward_x11 = 0;
1.34 markus 852: if (options->xauth_location == NULL)
1.80 markus 853: options->xauth_location = _PATH_XAUTH;
1.17 markus 854: if (options->gateway_ports == -1)
855: options->gateway_ports = 0;
856: if (options->use_privileged_port == -1)
1.65 markus 857: options->use_privileged_port = 0;
1.17 markus 858: if (options->rhosts_authentication == -1)
1.99 stevesk 859: options->rhosts_authentication = 0;
1.17 markus 860: if (options->rsa_authentication == -1)
861: options->rsa_authentication = 1;
1.50 markus 862: if (options->pubkey_authentication == -1)
863: options->pubkey_authentication = 1;
1.78 markus 864: if (options->challenge_response_authentication == -1)
1.83 markus 865: options->challenge_response_authentication = 1;
1.17 markus 866: if (options->kerberos_authentication == -1)
1.45 provos 867: options->kerberos_authentication = 1;
1.17 markus 868: if (options->kerberos_tgt_passing == -1)
869: options->kerberos_tgt_passing = 1;
870: if (options->afs_token_passing == -1)
871: options->afs_token_passing = 1;
872: if (options->password_authentication == -1)
873: options->password_authentication = 1;
1.48 markus 874: if (options->kbd_interactive_authentication == -1)
1.59 markus 875: options->kbd_interactive_authentication = 1;
1.17 markus 876: if (options->rhosts_rsa_authentication == -1)
1.99 stevesk 877: options->rhosts_rsa_authentication = 0;
1.72 markus 878: if (options->hostbased_authentication == -1)
879: options->hostbased_authentication = 0;
1.17 markus 880: if (options->batch_mode == -1)
881: options->batch_mode = 0;
882: if (options->check_host_ip == -1)
883: options->check_host_ip = 1;
884: if (options->strict_host_key_checking == -1)
885: options->strict_host_key_checking = 2; /* 2 is default */
886: if (options->compression == -1)
887: options->compression = 0;
888: if (options->keepalives == -1)
889: options->keepalives = 1;
890: if (options->compression_level == -1)
891: options->compression_level = 6;
892: if (options->port == -1)
893: options->port = 0; /* Filled in ssh_connect. */
894: if (options->connection_attempts == -1)
1.84 markus 895: options->connection_attempts = 1;
1.17 markus 896: if (options->number_of_password_prompts == -1)
897: options->number_of_password_prompts = 3;
898: /* Selected in ssh_login(). */
899: if (options->cipher == -1)
900: options->cipher = SSH_CIPHER_NOT_SET;
1.31 markus 901: /* options->ciphers, default set in myproposals.h */
1.62 markus 902: /* options->macs, default set in myproposals.h */
1.76 markus 903: /* options->hostkeyalgorithms, default set in myproposals.h */
1.25 markus 904: if (options->protocol == SSH_PROTO_UNKNOWN)
1.69 markus 905: options->protocol = SSH_PROTO_1|SSH_PROTO_2;
1.17 markus 906: if (options->num_identity_files == 0) {
1.50 markus 907: if (options->protocol & SSH_PROTO_1) {
1.61 deraadt 908: len = 2 + strlen(_PATH_SSH_CLIENT_IDENTITY) + 1;
1.50 markus 909: options->identity_files[options->num_identity_files] =
1.61 deraadt 910: xmalloc(len);
911: snprintf(options->identity_files[options->num_identity_files++],
912: len, "~/%.100s", _PATH_SSH_CLIENT_IDENTITY);
1.50 markus 913: }
914: if (options->protocol & SSH_PROTO_2) {
1.63 deraadt 915: len = 2 + strlen(_PATH_SSH_CLIENT_ID_RSA) + 1;
916: options->identity_files[options->num_identity_files] =
917: xmalloc(len);
918: snprintf(options->identity_files[options->num_identity_files++],
919: len, "~/%.100s", _PATH_SSH_CLIENT_ID_RSA);
920:
1.61 deraadt 921: len = 2 + strlen(_PATH_SSH_CLIENT_ID_DSA) + 1;
1.50 markus 922: options->identity_files[options->num_identity_files] =
1.61 deraadt 923: xmalloc(len);
924: snprintf(options->identity_files[options->num_identity_files++],
925: len, "~/%.100s", _PATH_SSH_CLIENT_ID_DSA);
1.50 markus 926: }
1.27 markus 927: }
1.17 markus 928: if (options->escape_char == -1)
929: options->escape_char = '~';
930: if (options->system_hostfile == NULL)
1.55 markus 931: options->system_hostfile = _PATH_SSH_SYSTEM_HOSTFILE;
1.17 markus 932: if (options->user_hostfile == NULL)
1.55 markus 933: options->user_hostfile = _PATH_SSH_USER_HOSTFILE;
1.27 markus 934: if (options->system_hostfile2 == NULL)
1.55 markus 935: options->system_hostfile2 = _PATH_SSH_SYSTEM_HOSTFILE2;
1.27 markus 936: if (options->user_hostfile2 == NULL)
1.55 markus 937: options->user_hostfile2 = _PATH_SSH_USER_HOSTFILE2;
1.95 markus 938: if (options->log_level == SYSLOG_LEVEL_NOT_SET)
1.54 markus 939: options->log_level = SYSLOG_LEVEL_INFO;
1.90 stevesk 940: if (options->clear_forwardings == 1)
941: clear_forwardings(options);
1.91 markus 942: if (options->no_host_authentication_for_localhost == - 1)
943: options->no_host_authentication_for_localhost = 0;
1.101 markus 944: if (options->enable_ssh_keysign == -1)
945: options->enable_ssh_keysign = 0;
1.105 markus 946: if (options->rekey_limit == -1)
947: options->rekey_limit = 0;
1.107 jakob 948: if (options->verify_host_key_dns == -1)
949: options->verify_host_key_dns = 0;
1.17 markus 950: /* options->proxy_command should not be set by default */
951: /* options->user will be set in the main program if appropriate */
952: /* options->hostname will be set in the main program if appropriate */
1.52 markus 953: /* options->host_key_alias should not be set by default */
1.67 markus 954: /* options->preferred_authentications will be set in ssh */
1.1 deraadt 955: }
![[BACK]](/icons/back.gif){kind=icon}
Return to readconf.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh