Annotation of src/usr.bin/ssh/readconf.c, Revision 1.116
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"
1.116 ! markus 15: RCSID("$OpenBSD: readconf.c,v 1.115 2003/07/22 13:35:22 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: PasswordAuthentication no
61:
62: Host puukko.hut.fi
63: User t35124p
64: ProxyCommand ssh-proxy %h %p
65:
66: Host *.fr
1.96 markus 67: PublicKeyAuthentication no
1.1 deraadt 68:
69: Host *.su
70: Cipher none
71: PasswordAuthentication no
72:
73: # Defaults for various options
74: Host *
75: ForwardAgent no
1.50 markus 76: ForwardX11 no
1.1 deraadt 77: PasswordAuthentication yes
78: RSAAuthentication yes
79: RhostsRSAAuthentication yes
80: StrictHostKeyChecking yes
81: KeepAlives no
82: IdentityFile ~/.ssh/identity
83: Port 22
84: EscapeChar ~
85:
86: */
87:
88: /* Keyword tokens. */
89:
1.17 markus 90: typedef enum {
91: oBadOption,
1.116 ! markus 92: oForwardAgent, oForwardX11, oGatewayPorts,
1.100 deraadt 93: oPasswordAuthentication, oRSAAuthentication,
1.59 markus 94: oChallengeResponseAuthentication, oXAuthLocation,
1.115 markus 95: oKerberosAuthentication, oKerberosTgtPassing,
1.17 markus 96: oIdentityFile, oHostName, oPort, oCipher, oRemoteForward, oLocalForward,
97: oUser, oHost, oEscapeChar, oRhostsRSAAuthentication, oProxyCommand,
98: oGlobalKnownHostsFile, oUserKnownHostsFile, oConnectionAttempts,
99: oBatchMode, oCheckHostIP, oStrictHostKeyChecking, oCompression,
1.59 markus 100: oCompressionLevel, oKeepAlives, oNumberOfPasswordPrompts,
1.62 markus 101: oUsePrivilegedPort, oLogLevel, oCiphers, oProtocol, oMacs,
1.50 markus 102: oGlobalKnownHostsFile2, oUserKnownHostsFile2, oPubkeyAuthentication,
1.67 markus 103: oKbdInteractiveAuthentication, oKbdInteractiveDevices, oHostKeyAlias,
1.76 markus 104: oDynamicForward, oPreferredAuthentications, oHostbasedAuthentication,
1.90 stevesk 105: oHostKeyAlgorithms, oBindAddress, oSmartcardDevice,
1.96 markus 106: oClearAllForwardings, oNoHostAuthenticationForLocalhost,
1.111 djm 107: oEnableSSHKeysign, oRekeyLimit, oVerifyHostKeyDNS, oConnectTimeout,
1.112 djm 108: oAddressFamily,
1.110 jakob 109: oDeprecated, oUnsupported
1.1 deraadt 110: } OpCodes;
111:
112: /* Textual representations of the tokens. */
113:
1.17 markus 114: static struct {
115: const char *name;
116: OpCodes opcode;
117: } keywords[] = {
118: { "forwardagent", oForwardAgent },
119: { "forwardx11", oForwardX11 },
1.34 markus 120: { "xauthlocation", oXAuthLocation },
1.17 markus 121: { "gatewayports", oGatewayPorts },
122: { "useprivilegedport", oUsePrivilegedPort },
1.116 ! markus 123: { "rhostsauthentication", oDeprecated },
1.17 markus 124: { "passwordauthentication", oPasswordAuthentication },
1.48 markus 125: { "kbdinteractiveauthentication", oKbdInteractiveAuthentication },
126: { "kbdinteractivedevices", oKbdInteractiveDevices },
1.17 markus 127: { "rsaauthentication", oRSAAuthentication },
1.50 markus 128: { "pubkeyauthentication", oPubkeyAuthentication },
1.59 markus 129: { "dsaauthentication", oPubkeyAuthentication }, /* alias */
1.72 markus 130: { "rhostsrsaauthentication", oRhostsRSAAuthentication },
1.73 markus 131: { "hostbasedauthentication", oHostbasedAuthentication },
1.59 markus 132: { "challengeresponseauthentication", oChallengeResponseAuthentication },
133: { "skeyauthentication", oChallengeResponseAuthentication }, /* alias */
134: { "tisauthentication", oChallengeResponseAuthentication }, /* alias */
1.115 markus 135: #ifdef KRB5
1.17 markus 136: { "kerberosauthentication", oKerberosAuthentication },
1.82 dugsong 137: { "kerberostgtpassing", oKerberosTgtPassing },
1.110 jakob 138: #else
139: { "kerberosauthentication", oUnsupported },
140: { "kerberostgtpassing", oUnsupported },
141: #endif
142: { "afstokenpassing", oUnsupported },
1.96 markus 143: { "fallbacktorsh", oDeprecated },
144: { "usersh", oDeprecated },
1.17 markus 145: { "identityfile", oIdentityFile },
1.50 markus 146: { "identityfile2", oIdentityFile }, /* alias */
1.17 markus 147: { "hostname", oHostName },
1.52 markus 148: { "hostkeyalias", oHostKeyAlias },
1.17 markus 149: { "proxycommand", oProxyCommand },
150: { "port", oPort },
151: { "cipher", oCipher },
1.25 markus 152: { "ciphers", oCiphers },
1.62 markus 153: { "macs", oMacs },
1.25 markus 154: { "protocol", oProtocol },
1.17 markus 155: { "remoteforward", oRemoteForward },
156: { "localforward", oLocalForward },
157: { "user", oUser },
158: { "host", oHost },
159: { "escapechar", oEscapeChar },
160: { "globalknownhostsfile", oGlobalKnownHostsFile },
1.81 markus 161: { "userknownhostsfile", oUserKnownHostsFile }, /* obsolete */
1.27 markus 162: { "globalknownhostsfile2", oGlobalKnownHostsFile2 },
1.81 markus 163: { "userknownhostsfile2", oUserKnownHostsFile2 }, /* obsolete */
1.17 markus 164: { "connectionattempts", oConnectionAttempts },
165: { "batchmode", oBatchMode },
166: { "checkhostip", oCheckHostIP },
167: { "stricthostkeychecking", oStrictHostKeyChecking },
168: { "compression", oCompression },
169: { "compressionlevel", oCompressionLevel },
170: { "keepalive", oKeepAlives },
171: { "numberofpasswordprompts", oNumberOfPasswordPrompts },
172: { "loglevel", oLogLevel },
1.71 markus 173: { "dynamicforward", oDynamicForward },
1.67 markus 174: { "preferredauthentications", oPreferredAuthentications },
1.76 markus 175: { "hostkeyalgorithms", oHostKeyAlgorithms },
1.77 markus 176: { "bindaddress", oBindAddress },
1.110 jakob 177: #ifdef SMARTCARD
1.85 jakob 178: { "smartcarddevice", oSmartcardDevice },
1.110 jakob 179: #else
180: { "smartcarddevice", oUnsupported },
181: #endif
1.93 deraadt 182: { "clearallforwardings", oClearAllForwardings },
1.101 markus 183: { "enablesshkeysign", oEnableSSHKeysign },
1.110 jakob 184: #ifdef DNS
1.107 jakob 185: { "verifyhostkeydns", oVerifyHostKeyDNS },
1.110 jakob 186: #else
187: { "verifyhostkeydns", oUnsupported },
188: #endif
1.93 deraadt 189: { "nohostauthenticationforlocalhost", oNoHostAuthenticationForLocalhost },
1.105 markus 190: { "rekeylimit", oRekeyLimit },
1.111 djm 191: { "connecttimeout", oConnectTimeout },
1.112 djm 192: { "addressfamily", oAddressFamily },
1.92 stevesk 193: { NULL, oBadOption }
1.13 markus 194: };
195:
1.19 markus 196: /*
197: * Adds a local TCP/IP port forward to options. Never returns if there is an
198: * error.
199: */
1.1 deraadt 200:
1.26 markus 201: void
1.22 markus 202: add_local_forward(Options *options, u_short port, const char *host,
203: u_short host_port)
1.1 deraadt 204: {
1.17 markus 205: Forward *fwd;
206: extern uid_t original_real_uid;
207: if (port < IPPORT_RESERVED && original_real_uid != 0)
1.64 millert 208: fatal("Privileged ports can only be forwarded by root.");
1.17 markus 209: if (options->num_local_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
210: fatal("Too many local forwards (max %d).", SSH_MAX_FORWARDS_PER_DIRECTION);
211: fwd = &options->local_forwards[options->num_local_forwards++];
212: fwd->port = port;
213: fwd->host = xstrdup(host);
214: fwd->host_port = host_port;
1.1 deraadt 215: }
216:
1.19 markus 217: /*
218: * Adds a remote TCP/IP port forward to options. Never returns if there is
219: * an error.
220: */
1.1 deraadt 221:
1.26 markus 222: void
1.22 markus 223: add_remote_forward(Options *options, u_short port, const char *host,
224: u_short host_port)
1.1 deraadt 225: {
1.17 markus 226: Forward *fwd;
227: if (options->num_remote_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
228: fatal("Too many remote forwards (max %d).",
1.93 deraadt 229: SSH_MAX_FORWARDS_PER_DIRECTION);
1.17 markus 230: fwd = &options->remote_forwards[options->num_remote_forwards++];
231: fwd->port = port;
232: fwd->host = xstrdup(host);
233: fwd->host_port = host_port;
1.1 deraadt 234: }
235:
1.90 stevesk 236: static void
237: clear_forwardings(Options *options)
238: {
239: int i;
240:
241: for (i = 0; i < options->num_local_forwards; i++)
242: xfree(options->local_forwards[i].host);
243: options->num_local_forwards = 0;
244: for (i = 0; i < options->num_remote_forwards; i++)
245: xfree(options->remote_forwards[i].host);
246: options->num_remote_forwards = 0;
247: }
248:
1.19 markus 249: /*
1.70 stevesk 250: * Returns the number of the token pointed to by cp or oBadOption.
1.19 markus 251: */
1.1 deraadt 252:
1.26 markus 253: static OpCodes
1.17 markus 254: parse_token(const char *cp, const char *filename, int linenum)
1.1 deraadt 255: {
1.51 markus 256: u_int i;
1.1 deraadt 257:
1.17 markus 258: for (i = 0; keywords[i].name; i++)
1.20 markus 259: if (strcasecmp(cp, keywords[i].name) == 0)
1.17 markus 260: return keywords[i].opcode;
261:
1.75 stevesk 262: error("%s: line %d: Bad configuration option: %s",
263: filename, linenum, cp);
1.17 markus 264: return oBadOption;
1.1 deraadt 265: }
266:
1.19 markus 267: /*
268: * Processes a single option line as used in the configuration files. This
269: * only sets those values that have not already been set.
270: */
1.102 markus 271: #define WHITESPACE " \t\r\n"
1.1 deraadt 272:
1.14 markus 273: int
274: process_config_line(Options *options, const char *host,
1.17 markus 275: char *line, const char *filename, int linenum,
276: int *activep)
1.1 deraadt 277: {
1.102 markus 278: char buf[256], *s, **charptr, *endofnumber, *keyword, *arg;
1.22 markus 279: int opcode, *intptr, value;
1.102 markus 280: size_t len;
1.22 markus 281: u_short fwd_port, fwd_host_port;
1.88 stevesk 282: char sfwd_host_port[6];
1.106 djm 283:
284: /* Strip trailing whitespace */
285: for(len = strlen(line) - 1; len > 0; len--) {
286: if (strchr(WHITESPACE, line[len]) == NULL)
287: break;
288: line[len] = '\0';
289: }
1.1 deraadt 290:
1.42 provos 291: s = line;
292: /* Get the keyword. (Each line is supposed to begin with a keyword). */
293: keyword = strdelim(&s);
294: /* Ignore leading whitespace. */
295: if (*keyword == '\0')
1.43 markus 296: keyword = strdelim(&s);
1.56 deraadt 297: if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#')
1.17 markus 298: return 0;
299:
1.38 provos 300: opcode = parse_token(keyword, filename, linenum);
1.17 markus 301:
302: switch (opcode) {
303: case oBadOption:
1.19 markus 304: /* don't panic, but count bad options */
305: return -1;
1.17 markus 306: /* NOTREACHED */
1.111 djm 307: case oConnectTimeout:
308: intptr = &options->connection_timeout;
309: /* parse_time: */
310: arg = strdelim(&s);
311: if (!arg || *arg == '\0')
312: fatal("%s line %d: missing time value.",
313: filename, linenum);
314: if ((value = convtime(arg)) == -1)
315: fatal("%s line %d: invalid time value.",
316: filename, linenum);
317: if (*intptr == -1)
318: *intptr = value;
319: break;
320:
1.17 markus 321: case oForwardAgent:
322: intptr = &options->forward_agent;
323: parse_flag:
1.42 provos 324: arg = strdelim(&s);
1.40 ho 325: if (!arg || *arg == '\0')
1.17 markus 326: fatal("%.200s line %d: Missing yes/no argument.", filename, linenum);
327: value = 0; /* To avoid compiler warning... */
1.38 provos 328: if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
1.17 markus 329: value = 1;
1.38 provos 330: else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
1.17 markus 331: value = 0;
332: else
333: fatal("%.200s line %d: Bad yes/no argument.", filename, linenum);
334: if (*activep && *intptr == -1)
335: *intptr = value;
336: break;
337:
338: case oForwardX11:
339: intptr = &options->forward_x11;
340: goto parse_flag;
341:
342: case oGatewayPorts:
343: intptr = &options->gateway_ports;
344: goto parse_flag;
345:
346: case oUsePrivilegedPort:
347: intptr = &options->use_privileged_port;
348: goto parse_flag;
349:
350: case oPasswordAuthentication:
351: intptr = &options->password_authentication;
352: goto parse_flag;
353:
1.48 markus 354: case oKbdInteractiveAuthentication:
355: intptr = &options->kbd_interactive_authentication;
356: goto parse_flag;
357:
358: case oKbdInteractiveDevices:
359: charptr = &options->kbd_interactive_devices;
360: goto parse_string;
361:
1.50 markus 362: case oPubkeyAuthentication:
363: intptr = &options->pubkey_authentication;
1.30 markus 364: goto parse_flag;
365:
1.17 markus 366: case oRSAAuthentication:
367: intptr = &options->rsa_authentication;
368: goto parse_flag;
369:
370: case oRhostsRSAAuthentication:
371: intptr = &options->rhosts_rsa_authentication;
372: goto parse_flag;
373:
1.72 markus 374: case oHostbasedAuthentication:
375: intptr = &options->hostbased_authentication;
376: goto parse_flag;
377:
1.59 markus 378: case oChallengeResponseAuthentication:
1.78 markus 379: intptr = &options->challenge_response_authentication;
1.17 markus 380: goto parse_flag;
1.108 jakob 381:
1.17 markus 382: case oKerberosAuthentication:
383: intptr = &options->kerberos_authentication;
384: goto parse_flag;
1.108 jakob 385:
1.17 markus 386: case oKerberosTgtPassing:
387: intptr = &options->kerberos_tgt_passing;
388: goto parse_flag;
1.108 jakob 389:
1.17 markus 390: case oBatchMode:
391: intptr = &options->batch_mode;
392: goto parse_flag;
393:
394: case oCheckHostIP:
395: intptr = &options->check_host_ip;
396: goto parse_flag;
397:
1.107 jakob 398: case oVerifyHostKeyDNS:
399: intptr = &options->verify_host_key_dns;
400: goto parse_flag;
401:
1.17 markus 402: case oStrictHostKeyChecking:
403: intptr = &options->strict_host_key_checking;
1.42 provos 404: arg = strdelim(&s);
1.40 ho 405: if (!arg || *arg == '\0')
1.60 stevesk 406: fatal("%.200s line %d: Missing yes/no/ask argument.",
1.93 deraadt 407: filename, linenum);
1.17 markus 408: value = 0; /* To avoid compiler warning... */
1.38 provos 409: if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
1.17 markus 410: value = 1;
1.38 provos 411: else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
1.17 markus 412: value = 0;
1.38 provos 413: else if (strcmp(arg, "ask") == 0)
1.17 markus 414: value = 2;
415: else
416: fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum);
417: if (*activep && *intptr == -1)
418: *intptr = value;
419: break;
420:
421: case oCompression:
422: intptr = &options->compression;
423: goto parse_flag;
424:
425: case oKeepAlives:
426: intptr = &options->keepalives;
427: goto parse_flag;
428:
1.91 markus 429: case oNoHostAuthenticationForLocalhost:
430: intptr = &options->no_host_authentication_for_localhost;
431: goto parse_flag;
432:
1.17 markus 433: case oNumberOfPasswordPrompts:
434: intptr = &options->number_of_password_prompts;
435: goto parse_int;
436:
437: case oCompressionLevel:
438: intptr = &options->compression_level;
439: goto parse_int;
440:
1.105 markus 441: case oRekeyLimit:
442: intptr = &options->rekey_limit;
443: arg = strdelim(&s);
444: if (!arg || *arg == '\0')
445: fatal("%.200s line %d: Missing argument.", filename, linenum);
446: if (arg[0] < '0' || arg[0] > '9')
447: fatal("%.200s line %d: Bad number.", filename, linenum);
448: value = strtol(arg, &endofnumber, 10);
449: if (arg == endofnumber)
450: fatal("%.200s line %d: Bad number.", filename, linenum);
451: switch (toupper(*endofnumber)) {
452: case 'K':
453: value *= 1<<10;
454: break;
455: case 'M':
456: value *= 1<<20;
457: break;
458: case 'G':
459: value *= 1<<30;
460: break;
461: }
462: if (*activep && *intptr == -1)
463: *intptr = value;
464: break;
465:
1.17 markus 466: case oIdentityFile:
1.42 provos 467: arg = strdelim(&s);
1.40 ho 468: if (!arg || *arg == '\0')
1.17 markus 469: fatal("%.200s line %d: Missing argument.", filename, linenum);
470: if (*activep) {
1.50 markus 471: intptr = &options->num_identity_files;
1.27 markus 472: if (*intptr >= SSH_MAX_IDENTITY_FILES)
1.17 markus 473: fatal("%.200s line %d: Too many identity files specified (max %d).",
1.93 deraadt 474: filename, linenum, SSH_MAX_IDENTITY_FILES);
1.50 markus 475: charptr = &options->identity_files[*intptr];
1.38 provos 476: *charptr = xstrdup(arg);
1.27 markus 477: *intptr = *intptr + 1;
1.17 markus 478: }
479: break;
480:
1.34 markus 481: case oXAuthLocation:
482: charptr=&options->xauth_location;
483: goto parse_string;
484:
1.17 markus 485: case oUser:
486: charptr = &options->user;
487: parse_string:
1.42 provos 488: arg = strdelim(&s);
1.40 ho 489: if (!arg || *arg == '\0')
1.17 markus 490: fatal("%.200s line %d: Missing argument.", filename, linenum);
491: if (*activep && *charptr == NULL)
1.38 provos 492: *charptr = xstrdup(arg);
1.17 markus 493: break;
494:
495: case oGlobalKnownHostsFile:
496: charptr = &options->system_hostfile;
497: goto parse_string;
498:
499: case oUserKnownHostsFile:
500: charptr = &options->user_hostfile;
501: goto parse_string;
502:
1.27 markus 503: case oGlobalKnownHostsFile2:
504: charptr = &options->system_hostfile2;
505: goto parse_string;
506:
507: case oUserKnownHostsFile2:
508: charptr = &options->user_hostfile2;
509: goto parse_string;
510:
1.17 markus 511: case oHostName:
512: charptr = &options->hostname;
513: goto parse_string;
514:
1.52 markus 515: case oHostKeyAlias:
516: charptr = &options->host_key_alias;
517: goto parse_string;
518:
1.67 markus 519: case oPreferredAuthentications:
520: charptr = &options->preferred_authentications;
521: goto parse_string;
522:
1.77 markus 523: case oBindAddress:
524: charptr = &options->bind_address;
525: goto parse_string;
526:
1.85 jakob 527: case oSmartcardDevice:
1.86 markus 528: charptr = &options->smartcard_device;
529: goto parse_string;
1.85 jakob 530:
1.17 markus 531: case oProxyCommand:
1.113 markus 532: if (s == NULL)
533: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.17 markus 534: charptr = &options->proxy_command;
1.102 markus 535: len = strspn(s, WHITESPACE "=");
1.17 markus 536: if (*activep && *charptr == NULL)
1.102 markus 537: *charptr = xstrdup(s + len);
1.17 markus 538: return 0;
539:
540: case oPort:
541: intptr = &options->port;
542: parse_int:
1.42 provos 543: arg = strdelim(&s);
1.40 ho 544: if (!arg || *arg == '\0')
1.17 markus 545: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 546: if (arg[0] < '0' || arg[0] > '9')
1.17 markus 547: fatal("%.200s line %d: Bad number.", filename, linenum);
1.21 markus 548:
549: /* Octal, decimal, or hex format? */
1.38 provos 550: value = strtol(arg, &endofnumber, 0);
551: if (arg == endofnumber)
1.21 markus 552: fatal("%.200s line %d: Bad number.", filename, linenum);
1.17 markus 553: if (*activep && *intptr == -1)
554: *intptr = value;
555: break;
556:
557: case oConnectionAttempts:
558: intptr = &options->connection_attempts;
559: goto parse_int;
560:
561: case oCipher:
562: intptr = &options->cipher;
1.42 provos 563: arg = strdelim(&s);
1.40 ho 564: if (!arg || *arg == '\0')
1.32 markus 565: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 566: value = cipher_number(arg);
1.17 markus 567: if (value == -1)
568: fatal("%.200s line %d: Bad cipher '%s'.",
1.93 deraadt 569: filename, linenum, arg ? arg : "<NONE>");
1.17 markus 570: if (*activep && *intptr == -1)
571: *intptr = value;
572: break;
573:
1.25 markus 574: case oCiphers:
1.42 provos 575: arg = strdelim(&s);
1.40 ho 576: if (!arg || *arg == '\0')
1.32 markus 577: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 578: if (!ciphers_valid(arg))
1.31 markus 579: fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.",
1.93 deraadt 580: filename, linenum, arg ? arg : "<NONE>");
1.25 markus 581: if (*activep && options->ciphers == NULL)
1.38 provos 582: options->ciphers = xstrdup(arg);
1.25 markus 583: break;
584:
1.62 markus 585: case oMacs:
586: arg = strdelim(&s);
587: if (!arg || *arg == '\0')
588: fatal("%.200s line %d: Missing argument.", filename, linenum);
589: if (!mac_valid(arg))
590: fatal("%.200s line %d: Bad SSH2 Mac spec '%s'.",
1.93 deraadt 591: filename, linenum, arg ? arg : "<NONE>");
1.62 markus 592: if (*activep && options->macs == NULL)
593: options->macs = xstrdup(arg);
594: break;
595:
1.76 markus 596: case oHostKeyAlgorithms:
597: arg = strdelim(&s);
598: if (!arg || *arg == '\0')
599: fatal("%.200s line %d: Missing argument.", filename, linenum);
600: if (!key_names_valid2(arg))
601: fatal("%.200s line %d: Bad protocol 2 host key algorithms '%s'.",
1.93 deraadt 602: filename, linenum, arg ? arg : "<NONE>");
1.76 markus 603: if (*activep && options->hostkeyalgorithms == NULL)
604: options->hostkeyalgorithms = xstrdup(arg);
605: break;
606:
1.25 markus 607: case oProtocol:
608: intptr = &options->protocol;
1.42 provos 609: arg = strdelim(&s);
1.40 ho 610: if (!arg || *arg == '\0')
1.32 markus 611: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 612: value = proto_spec(arg);
1.25 markus 613: if (value == SSH_PROTO_UNKNOWN)
614: fatal("%.200s line %d: Bad protocol spec '%s'.",
1.93 deraadt 615: filename, linenum, arg ? arg : "<NONE>");
1.25 markus 616: if (*activep && *intptr == SSH_PROTO_UNKNOWN)
617: *intptr = value;
618: break;
619:
1.17 markus 620: case oLogLevel:
621: intptr = (int *) &options->log_level;
1.42 provos 622: arg = strdelim(&s);
1.38 provos 623: value = log_level_number(arg);
1.95 markus 624: if (value == SYSLOG_LEVEL_NOT_SET)
1.64 millert 625: fatal("%.200s line %d: unsupported log level '%s'",
1.93 deraadt 626: filename, linenum, arg ? arg : "<NONE>");
1.95 markus 627: if (*activep && (LogLevel) *intptr == SYSLOG_LEVEL_NOT_SET)
1.17 markus 628: *intptr = (LogLevel) value;
629: break;
630:
1.88 stevesk 631: case oLocalForward:
1.17 markus 632: case oRemoteForward:
1.42 provos 633: arg = strdelim(&s);
1.40 ho 634: if (!arg || *arg == '\0')
1.88 stevesk 635: fatal("%.200s line %d: Missing port argument.",
636: filename, linenum);
637: if ((fwd_port = a2port(arg)) == 0)
638: fatal("%.200s line %d: Bad listen port.",
639: filename, linenum);
1.42 provos 640: arg = strdelim(&s);
1.40 ho 641: if (!arg || *arg == '\0')
1.17 markus 642: fatal("%.200s line %d: Missing second argument.",
1.88 stevesk 643: filename, linenum);
644: if (sscanf(arg, "%255[^:]:%5[0-9]", buf, sfwd_host_port) != 2 &&
645: sscanf(arg, "%255[^/]/%5[0-9]", buf, sfwd_host_port) != 2)
646: fatal("%.200s line %d: Bad forwarding specification.",
647: filename, linenum);
648: if ((fwd_host_port = a2port(sfwd_host_port)) == 0)
649: fatal("%.200s line %d: Bad forwarding port.",
650: filename, linenum);
651: if (*activep) {
652: if (opcode == oLocalForward)
653: add_local_forward(options, fwd_port, buf,
654: fwd_host_port);
655: else if (opcode == oRemoteForward)
656: add_remote_forward(options, fwd_port, buf,
657: fwd_host_port);
658: }
1.17 markus 659: break;
1.71 markus 660:
661: case oDynamicForward:
662: arg = strdelim(&s);
663: if (!arg || *arg == '\0')
664: fatal("%.200s line %d: Missing port argument.",
665: filename, linenum);
1.74 stevesk 666: fwd_port = a2port(arg);
667: if (fwd_port == 0)
1.71 markus 668: fatal("%.200s line %d: Badly formatted port number.",
669: filename, linenum);
1.87 markus 670: if (*activep)
671: add_local_forward(options, fwd_port, "socks4", 0);
1.72 markus 672: break;
1.17 markus 673:
1.90 stevesk 674: case oClearAllForwardings:
675: intptr = &options->clear_forwardings;
676: goto parse_flag;
677:
1.17 markus 678: case oHost:
679: *activep = 0;
1.42 provos 680: while ((arg = strdelim(&s)) != NULL && *arg != '\0')
1.38 provos 681: if (match_pattern(host, arg)) {
682: debug("Applying options for %.100s", arg);
1.17 markus 683: *activep = 1;
684: break;
685: }
1.42 provos 686: /* Avoid garbage check below, as strdelim is done. */
1.17 markus 687: return 0;
688:
689: case oEscapeChar:
690: intptr = &options->escape_char;
1.42 provos 691: arg = strdelim(&s);
1.40 ho 692: if (!arg || *arg == '\0')
1.17 markus 693: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 694: if (arg[0] == '^' && arg[2] == 0 &&
1.51 markus 695: (u_char) arg[1] >= 64 && (u_char) arg[1] < 128)
696: value = (u_char) arg[1] & 31;
1.38 provos 697: else if (strlen(arg) == 1)
1.51 markus 698: value = (u_char) arg[0];
1.38 provos 699: else if (strcmp(arg, "none") == 0)
1.79 stevesk 700: value = SSH_ESCAPECHAR_NONE;
1.17 markus 701: else {
702: fatal("%.200s line %d: Bad escape character.",
1.93 deraadt 703: filename, linenum);
1.17 markus 704: /* NOTREACHED */
705: value = 0; /* Avoid compiler warning. */
706: }
707: if (*activep && *intptr == -1)
708: *intptr = value;
1.112 djm 709: break;
710:
711: case oAddressFamily:
712: arg = strdelim(&s);
1.114 djm 713: intptr = &options->address_family;
1.112 djm 714: if (strcasecmp(arg, "inet") == 0)
1.114 djm 715: value = AF_INET;
1.112 djm 716: else if (strcasecmp(arg, "inet6") == 0)
1.114 djm 717: value = AF_INET6;
1.112 djm 718: else if (strcasecmp(arg, "any") == 0)
1.114 djm 719: value = AF_UNSPEC;
1.112 djm 720: else
721: fatal("Unsupported AddressFamily \"%s\"", arg);
1.114 djm 722: if (*activep && *intptr == -1)
723: *intptr = value;
1.17 markus 724: break;
725:
1.101 markus 726: case oEnableSSHKeysign:
727: intptr = &options->enable_ssh_keysign;
728: goto parse_flag;
729:
1.96 markus 730: case oDeprecated:
1.98 markus 731: debug("%s line %d: Deprecated option \"%s\"",
1.96 markus 732: filename, linenum, keyword);
1.98 markus 733: return 0;
1.96 markus 734:
1.110 jakob 735: case oUnsupported:
736: error("%s line %d: Unsupported option \"%s\"",
737: filename, linenum, keyword);
738: return 0;
739:
1.17 markus 740: default:
741: fatal("process_config_line: Unimplemented opcode %d", opcode);
742: }
743:
744: /* Check that there is no garbage at end of line. */
1.57 djm 745: if ((arg = strdelim(&s)) != NULL && *arg != '\0') {
1.39 ho 746: fatal("%.200s line %d: garbage at end of line; \"%.200s\".",
1.93 deraadt 747: filename, linenum, arg);
1.39 ho 748: }
1.17 markus 749: return 0;
1.1 deraadt 750: }
751:
752:
1.19 markus 753: /*
754: * Reads the config file and modifies the options accordingly. Options
755: * should already be initialized before this call. This never returns if
1.89 stevesk 756: * there is an error. If the file does not exist, this returns 0.
1.19 markus 757: */
1.1 deraadt 758:
1.89 stevesk 759: int
1.17 markus 760: read_config_file(const char *filename, const char *host, Options *options)
1.1 deraadt 761: {
1.17 markus 762: FILE *f;
763: char line[1024];
764: int active, linenum;
765: int bad_options = 0;
766:
767: /* Open the file. */
768: f = fopen(filename, "r");
769: if (!f)
1.89 stevesk 770: return 0;
1.17 markus 771:
772: debug("Reading configuration data %.200s", filename);
773:
1.19 markus 774: /*
775: * Mark that we are now processing the options. This flag is turned
776: * on/off by Host specifications.
777: */
1.17 markus 778: active = 1;
779: linenum = 0;
780: while (fgets(line, sizeof(line), f)) {
781: /* Update line number counter. */
782: linenum++;
783: if (process_config_line(options, host, line, filename, linenum, &active) != 0)
784: bad_options++;
785: }
786: fclose(f);
787: if (bad_options > 0)
1.64 millert 788: fatal("%s: terminating, %d bad configuration options",
1.93 deraadt 789: filename, bad_options);
1.89 stevesk 790: return 1;
1.1 deraadt 791: }
792:
1.19 markus 793: /*
794: * Initializes options to special values that indicate that they have not yet
795: * been set. Read_config_file will only set options with this value. Options
796: * are processed in the following order: command line, user config file,
797: * system config file. Last, fill_default_options is called.
798: */
1.1 deraadt 799:
1.26 markus 800: void
1.17 markus 801: initialize_options(Options * options)
1.1 deraadt 802: {
1.17 markus 803: memset(options, 'X', sizeof(*options));
804: options->forward_agent = -1;
805: options->forward_x11 = -1;
1.34 markus 806: options->xauth_location = NULL;
1.17 markus 807: options->gateway_ports = -1;
808: options->use_privileged_port = -1;
809: options->rsa_authentication = -1;
1.50 markus 810: options->pubkey_authentication = -1;
1.78 markus 811: options->challenge_response_authentication = -1;
1.17 markus 812: options->kerberos_authentication = -1;
1.82 dugsong 813: options->kerberos_tgt_passing = -1;
1.17 markus 814: options->password_authentication = -1;
1.48 markus 815: options->kbd_interactive_authentication = -1;
816: options->kbd_interactive_devices = NULL;
1.17 markus 817: options->rhosts_rsa_authentication = -1;
1.72 markus 818: options->hostbased_authentication = -1;
1.17 markus 819: options->batch_mode = -1;
820: options->check_host_ip = -1;
821: options->strict_host_key_checking = -1;
822: options->compression = -1;
823: options->keepalives = -1;
824: options->compression_level = -1;
825: options->port = -1;
1.114 djm 826: options->address_family = -1;
1.17 markus 827: options->connection_attempts = -1;
1.111 djm 828: options->connection_timeout = -1;
1.17 markus 829: options->number_of_password_prompts = -1;
830: options->cipher = -1;
1.25 markus 831: options->ciphers = NULL;
1.62 markus 832: options->macs = NULL;
1.76 markus 833: options->hostkeyalgorithms = NULL;
1.25 markus 834: options->protocol = SSH_PROTO_UNKNOWN;
1.17 markus 835: options->num_identity_files = 0;
836: options->hostname = NULL;
1.52 markus 837: options->host_key_alias = NULL;
1.17 markus 838: options->proxy_command = NULL;
839: options->user = NULL;
840: options->escape_char = -1;
841: options->system_hostfile = NULL;
842: options->user_hostfile = NULL;
1.27 markus 843: options->system_hostfile2 = NULL;
844: options->user_hostfile2 = NULL;
1.17 markus 845: options->num_local_forwards = 0;
846: options->num_remote_forwards = 0;
1.90 stevesk 847: options->clear_forwardings = -1;
1.95 markus 848: options->log_level = SYSLOG_LEVEL_NOT_SET;
1.67 markus 849: options->preferred_authentications = NULL;
1.77 markus 850: options->bind_address = NULL;
1.86 markus 851: options->smartcard_device = NULL;
1.101 markus 852: options->enable_ssh_keysign = - 1;
1.91 markus 853: options->no_host_authentication_for_localhost = - 1;
1.105 markus 854: options->rekey_limit = - 1;
1.107 jakob 855: options->verify_host_key_dns = -1;
1.1 deraadt 856: }
857:
1.19 markus 858: /*
859: * Called after processing other sources of option data, this fills those
860: * options for which no value has been specified with their default values.
861: */
1.1 deraadt 862:
1.26 markus 863: void
1.17 markus 864: fill_default_options(Options * options)
1.1 deraadt 865: {
1.61 deraadt 866: int len;
867:
1.17 markus 868: if (options->forward_agent == -1)
1.33 markus 869: options->forward_agent = 0;
1.17 markus 870: if (options->forward_x11 == -1)
1.23 markus 871: options->forward_x11 = 0;
1.34 markus 872: if (options->xauth_location == NULL)
1.80 markus 873: options->xauth_location = _PATH_XAUTH;
1.17 markus 874: if (options->gateway_ports == -1)
875: options->gateway_ports = 0;
876: if (options->use_privileged_port == -1)
1.65 markus 877: options->use_privileged_port = 0;
1.17 markus 878: if (options->rsa_authentication == -1)
879: options->rsa_authentication = 1;
1.50 markus 880: if (options->pubkey_authentication == -1)
881: options->pubkey_authentication = 1;
1.78 markus 882: if (options->challenge_response_authentication == -1)
1.83 markus 883: options->challenge_response_authentication = 1;
1.17 markus 884: if (options->kerberos_authentication == -1)
1.45 provos 885: options->kerberos_authentication = 1;
1.17 markus 886: if (options->kerberos_tgt_passing == -1)
887: options->kerberos_tgt_passing = 1;
888: if (options->password_authentication == -1)
889: options->password_authentication = 1;
1.48 markus 890: if (options->kbd_interactive_authentication == -1)
1.59 markus 891: options->kbd_interactive_authentication = 1;
1.17 markus 892: if (options->rhosts_rsa_authentication == -1)
1.99 stevesk 893: options->rhosts_rsa_authentication = 0;
1.72 markus 894: if (options->hostbased_authentication == -1)
895: options->hostbased_authentication = 0;
1.17 markus 896: if (options->batch_mode == -1)
897: options->batch_mode = 0;
898: if (options->check_host_ip == -1)
899: options->check_host_ip = 1;
900: if (options->strict_host_key_checking == -1)
901: options->strict_host_key_checking = 2; /* 2 is default */
902: if (options->compression == -1)
903: options->compression = 0;
904: if (options->keepalives == -1)
905: options->keepalives = 1;
906: if (options->compression_level == -1)
907: options->compression_level = 6;
908: if (options->port == -1)
909: options->port = 0; /* Filled in ssh_connect. */
1.114 djm 910: if (options->address_family == -1)
911: options->address_family = AF_UNSPEC;
1.17 markus 912: if (options->connection_attempts == -1)
1.84 markus 913: options->connection_attempts = 1;
1.17 markus 914: if (options->number_of_password_prompts == -1)
915: options->number_of_password_prompts = 3;
916: /* Selected in ssh_login(). */
917: if (options->cipher == -1)
918: options->cipher = SSH_CIPHER_NOT_SET;
1.31 markus 919: /* options->ciphers, default set in myproposals.h */
1.62 markus 920: /* options->macs, default set in myproposals.h */
1.76 markus 921: /* options->hostkeyalgorithms, default set in myproposals.h */
1.25 markus 922: if (options->protocol == SSH_PROTO_UNKNOWN)
1.69 markus 923: options->protocol = SSH_PROTO_1|SSH_PROTO_2;
1.17 markus 924: if (options->num_identity_files == 0) {
1.50 markus 925: if (options->protocol & SSH_PROTO_1) {
1.61 deraadt 926: len = 2 + strlen(_PATH_SSH_CLIENT_IDENTITY) + 1;
1.50 markus 927: options->identity_files[options->num_identity_files] =
1.61 deraadt 928: xmalloc(len);
929: snprintf(options->identity_files[options->num_identity_files++],
930: len, "~/%.100s", _PATH_SSH_CLIENT_IDENTITY);
1.50 markus 931: }
932: if (options->protocol & SSH_PROTO_2) {
1.63 deraadt 933: len = 2 + strlen(_PATH_SSH_CLIENT_ID_RSA) + 1;
934: options->identity_files[options->num_identity_files] =
935: xmalloc(len);
936: snprintf(options->identity_files[options->num_identity_files++],
937: len, "~/%.100s", _PATH_SSH_CLIENT_ID_RSA);
938:
1.61 deraadt 939: len = 2 + strlen(_PATH_SSH_CLIENT_ID_DSA) + 1;
1.50 markus 940: options->identity_files[options->num_identity_files] =
1.61 deraadt 941: xmalloc(len);
942: snprintf(options->identity_files[options->num_identity_files++],
943: len, "~/%.100s", _PATH_SSH_CLIENT_ID_DSA);
1.50 markus 944: }
1.27 markus 945: }
1.17 markus 946: if (options->escape_char == -1)
947: options->escape_char = '~';
948: if (options->system_hostfile == NULL)
1.55 markus 949: options->system_hostfile = _PATH_SSH_SYSTEM_HOSTFILE;
1.17 markus 950: if (options->user_hostfile == NULL)
1.55 markus 951: options->user_hostfile = _PATH_SSH_USER_HOSTFILE;
1.27 markus 952: if (options->system_hostfile2 == NULL)
1.55 markus 953: options->system_hostfile2 = _PATH_SSH_SYSTEM_HOSTFILE2;
1.27 markus 954: if (options->user_hostfile2 == NULL)
1.55 markus 955: options->user_hostfile2 = _PATH_SSH_USER_HOSTFILE2;
1.95 markus 956: if (options->log_level == SYSLOG_LEVEL_NOT_SET)
1.54 markus 957: options->log_level = SYSLOG_LEVEL_INFO;
1.90 stevesk 958: if (options->clear_forwardings == 1)
959: clear_forwardings(options);
1.91 markus 960: if (options->no_host_authentication_for_localhost == - 1)
961: options->no_host_authentication_for_localhost = 0;
1.101 markus 962: if (options->enable_ssh_keysign == -1)
963: options->enable_ssh_keysign = 0;
1.105 markus 964: if (options->rekey_limit == -1)
965: options->rekey_limit = 0;
1.107 jakob 966: if (options->verify_host_key_dns == -1)
967: options->verify_host_key_dns = 0;
1.17 markus 968: /* options->proxy_command should not be set by default */
969: /* options->user will be set in the main program if appropriate */
970: /* options->hostname will be set in the main program if appropriate */
1.52 markus 971: /* options->host_key_alias should not be set by default */
1.67 markus 972: /* options->preferred_authentications will be set in ssh */
1.1 deraadt 973: }
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