Annotation of src/usr.bin/ssh/readconf.c, Revision 1.109
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"
1.109 ! jakob 15: RCSID("$OpenBSD: readconf.c,v 1.108 2003/05/15 01:48:10 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,
1.96 markus 110: oDeprecated
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 */
1.17 markus 136: { "kerberosauthentication", oKerberosAuthentication },
1.82 dugsong 137: { "kerberostgtpassing", oKerberosTgtPassing },
1.17 markus 138: { "afstokenpassing", oAFSTokenPassing },
1.96 markus 139: { "fallbacktorsh", oDeprecated },
140: { "usersh", oDeprecated },
1.17 markus 141: { "identityfile", oIdentityFile },
1.50 markus 142: { "identityfile2", oIdentityFile }, /* alias */
1.17 markus 143: { "hostname", oHostName },
1.52 markus 144: { "hostkeyalias", oHostKeyAlias },
1.17 markus 145: { "proxycommand", oProxyCommand },
146: { "port", oPort },
147: { "cipher", oCipher },
1.25 markus 148: { "ciphers", oCiphers },
1.62 markus 149: { "macs", oMacs },
1.25 markus 150: { "protocol", oProtocol },
1.17 markus 151: { "remoteforward", oRemoteForward },
152: { "localforward", oLocalForward },
153: { "user", oUser },
154: { "host", oHost },
155: { "escapechar", oEscapeChar },
156: { "globalknownhostsfile", oGlobalKnownHostsFile },
1.81 markus 157: { "userknownhostsfile", oUserKnownHostsFile }, /* obsolete */
1.27 markus 158: { "globalknownhostsfile2", oGlobalKnownHostsFile2 },
1.81 markus 159: { "userknownhostsfile2", oUserKnownHostsFile2 }, /* obsolete */
1.17 markus 160: { "connectionattempts", oConnectionAttempts },
161: { "batchmode", oBatchMode },
162: { "checkhostip", oCheckHostIP },
163: { "stricthostkeychecking", oStrictHostKeyChecking },
164: { "compression", oCompression },
165: { "compressionlevel", oCompressionLevel },
166: { "keepalive", oKeepAlives },
167: { "numberofpasswordprompts", oNumberOfPasswordPrompts },
168: { "loglevel", oLogLevel },
1.71 markus 169: { "dynamicforward", oDynamicForward },
1.67 markus 170: { "preferredauthentications", oPreferredAuthentications },
1.76 markus 171: { "hostkeyalgorithms", oHostKeyAlgorithms },
1.77 markus 172: { "bindaddress", oBindAddress },
1.85 jakob 173: { "smartcarddevice", oSmartcardDevice },
1.93 deraadt 174: { "clearallforwardings", oClearAllForwardings },
1.101 markus 175: { "enablesshkeysign", oEnableSSHKeysign },
1.107 jakob 176: { "verifyhostkeydns", oVerifyHostKeyDNS },
1.93 deraadt 177: { "nohostauthenticationforlocalhost", oNoHostAuthenticationForLocalhost },
1.105 markus 178: { "rekeylimit", oRekeyLimit },
1.92 stevesk 179: { NULL, oBadOption }
1.13 markus 180: };
181:
1.19 markus 182: /*
183: * Adds a local TCP/IP port forward to options. Never returns if there is an
184: * error.
185: */
1.1 deraadt 186:
1.26 markus 187: void
1.22 markus 188: add_local_forward(Options *options, u_short port, const char *host,
189: u_short host_port)
1.1 deraadt 190: {
1.17 markus 191: Forward *fwd;
192: extern uid_t original_real_uid;
193: if (port < IPPORT_RESERVED && original_real_uid != 0)
1.64 millert 194: fatal("Privileged ports can only be forwarded by root.");
1.17 markus 195: if (options->num_local_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
196: fatal("Too many local forwards (max %d).", SSH_MAX_FORWARDS_PER_DIRECTION);
197: fwd = &options->local_forwards[options->num_local_forwards++];
198: fwd->port = port;
199: fwd->host = xstrdup(host);
200: fwd->host_port = host_port;
1.1 deraadt 201: }
202:
1.19 markus 203: /*
204: * Adds a remote TCP/IP port forward to options. Never returns if there is
205: * an error.
206: */
1.1 deraadt 207:
1.26 markus 208: void
1.22 markus 209: add_remote_forward(Options *options, u_short port, const char *host,
210: u_short host_port)
1.1 deraadt 211: {
1.17 markus 212: Forward *fwd;
213: if (options->num_remote_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
214: fatal("Too many remote forwards (max %d).",
1.93 deraadt 215: SSH_MAX_FORWARDS_PER_DIRECTION);
1.17 markus 216: fwd = &options->remote_forwards[options->num_remote_forwards++];
217: fwd->port = port;
218: fwd->host = xstrdup(host);
219: fwd->host_port = host_port;
1.1 deraadt 220: }
221:
1.90 stevesk 222: static void
223: clear_forwardings(Options *options)
224: {
225: int i;
226:
227: for (i = 0; i < options->num_local_forwards; i++)
228: xfree(options->local_forwards[i].host);
229: options->num_local_forwards = 0;
230: for (i = 0; i < options->num_remote_forwards; i++)
231: xfree(options->remote_forwards[i].host);
232: options->num_remote_forwards = 0;
233: }
234:
1.19 markus 235: /*
1.70 stevesk 236: * Returns the number of the token pointed to by cp or oBadOption.
1.19 markus 237: */
1.1 deraadt 238:
1.26 markus 239: static OpCodes
1.17 markus 240: parse_token(const char *cp, const char *filename, int linenum)
1.1 deraadt 241: {
1.51 markus 242: u_int i;
1.1 deraadt 243:
1.17 markus 244: for (i = 0; keywords[i].name; i++)
1.20 markus 245: if (strcasecmp(cp, keywords[i].name) == 0)
1.17 markus 246: return keywords[i].opcode;
247:
1.75 stevesk 248: error("%s: line %d: Bad configuration option: %s",
249: filename, linenum, cp);
1.17 markus 250: return oBadOption;
1.1 deraadt 251: }
252:
1.19 markus 253: /*
254: * Processes a single option line as used in the configuration files. This
255: * only sets those values that have not already been set.
256: */
1.102 markus 257: #define WHITESPACE " \t\r\n"
1.1 deraadt 258:
1.14 markus 259: int
260: process_config_line(Options *options, const char *host,
1.17 markus 261: char *line, const char *filename, int linenum,
262: int *activep)
1.1 deraadt 263: {
1.102 markus 264: char buf[256], *s, **charptr, *endofnumber, *keyword, *arg;
1.22 markus 265: int opcode, *intptr, value;
1.102 markus 266: size_t len;
1.22 markus 267: u_short fwd_port, fwd_host_port;
1.88 stevesk 268: char sfwd_host_port[6];
1.106 djm 269:
270: /* Strip trailing whitespace */
271: for(len = strlen(line) - 1; len > 0; len--) {
272: if (strchr(WHITESPACE, line[len]) == NULL)
273: break;
274: line[len] = '\0';
275: }
1.1 deraadt 276:
1.42 provos 277: s = line;
278: /* Get the keyword. (Each line is supposed to begin with a keyword). */
279: keyword = strdelim(&s);
280: /* Ignore leading whitespace. */
281: if (*keyword == '\0')
1.43 markus 282: keyword = strdelim(&s);
1.56 deraadt 283: if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#')
1.17 markus 284: return 0;
285:
1.38 provos 286: opcode = parse_token(keyword, filename, linenum);
1.17 markus 287:
288: switch (opcode) {
289: case oBadOption:
1.19 markus 290: /* don't panic, but count bad options */
291: return -1;
1.17 markus 292: /* NOTREACHED */
293: case oForwardAgent:
294: intptr = &options->forward_agent;
295: parse_flag:
1.42 provos 296: arg = strdelim(&s);
1.40 ho 297: if (!arg || *arg == '\0')
1.17 markus 298: fatal("%.200s line %d: Missing yes/no argument.", filename, linenum);
299: value = 0; /* To avoid compiler warning... */
1.38 provos 300: if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
1.17 markus 301: value = 1;
1.38 provos 302: else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
1.17 markus 303: value = 0;
304: else
305: fatal("%.200s line %d: Bad yes/no argument.", filename, linenum);
306: if (*activep && *intptr == -1)
307: *intptr = value;
308: break;
309:
310: case oForwardX11:
311: intptr = &options->forward_x11;
312: goto parse_flag;
313:
314: case oGatewayPorts:
315: intptr = &options->gateway_ports;
316: goto parse_flag;
317:
318: case oUsePrivilegedPort:
319: intptr = &options->use_privileged_port;
320: goto parse_flag;
321:
322: case oRhostsAuthentication:
323: intptr = &options->rhosts_authentication;
324: goto parse_flag;
325:
326: case oPasswordAuthentication:
327: intptr = &options->password_authentication;
328: goto parse_flag;
329:
1.48 markus 330: case oKbdInteractiveAuthentication:
331: intptr = &options->kbd_interactive_authentication;
332: goto parse_flag;
333:
334: case oKbdInteractiveDevices:
335: charptr = &options->kbd_interactive_devices;
336: goto parse_string;
337:
1.50 markus 338: case oPubkeyAuthentication:
339: intptr = &options->pubkey_authentication;
1.30 markus 340: goto parse_flag;
341:
1.17 markus 342: case oRSAAuthentication:
343: intptr = &options->rsa_authentication;
344: goto parse_flag;
345:
346: case oRhostsRSAAuthentication:
347: intptr = &options->rhosts_rsa_authentication;
348: goto parse_flag;
349:
1.72 markus 350: case oHostbasedAuthentication:
351: intptr = &options->hostbased_authentication;
352: goto parse_flag;
353:
1.59 markus 354: case oChallengeResponseAuthentication:
1.78 markus 355: intptr = &options->challenge_response_authentication;
1.17 markus 356: goto parse_flag;
1.108 jakob 357:
1.17 markus 358: case oKerberosAuthentication:
359: intptr = &options->kerberos_authentication;
360: goto parse_flag;
1.108 jakob 361:
1.17 markus 362: case oKerberosTgtPassing:
363: intptr = &options->kerberos_tgt_passing;
364: goto parse_flag;
1.108 jakob 365:
1.17 markus 366: case oAFSTokenPassing:
367: intptr = &options->afs_token_passing;
368: goto parse_flag;
1.108 jakob 369:
1.17 markus 370: case oBatchMode:
371: intptr = &options->batch_mode;
372: goto parse_flag;
373:
374: case oCheckHostIP:
375: intptr = &options->check_host_ip;
376: goto parse_flag;
377:
1.107 jakob 378: case oVerifyHostKeyDNS:
379: intptr = &options->verify_host_key_dns;
380: goto parse_flag;
381:
1.17 markus 382: case oStrictHostKeyChecking:
383: intptr = &options->strict_host_key_checking;
1.42 provos 384: arg = strdelim(&s);
1.40 ho 385: if (!arg || *arg == '\0')
1.60 stevesk 386: fatal("%.200s line %d: Missing yes/no/ask argument.",
1.93 deraadt 387: filename, linenum);
1.17 markus 388: value = 0; /* To avoid compiler warning... */
1.38 provos 389: if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
1.17 markus 390: value = 1;
1.38 provos 391: else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
1.17 markus 392: value = 0;
1.38 provos 393: else if (strcmp(arg, "ask") == 0)
1.17 markus 394: value = 2;
395: else
396: fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum);
397: if (*activep && *intptr == -1)
398: *intptr = value;
399: break;
400:
401: case oCompression:
402: intptr = &options->compression;
403: goto parse_flag;
404:
405: case oKeepAlives:
406: intptr = &options->keepalives;
407: goto parse_flag;
408:
1.91 markus 409: case oNoHostAuthenticationForLocalhost:
410: intptr = &options->no_host_authentication_for_localhost;
411: goto parse_flag;
412:
1.17 markus 413: case oNumberOfPasswordPrompts:
414: intptr = &options->number_of_password_prompts;
415: goto parse_int;
416:
417: case oCompressionLevel:
418: intptr = &options->compression_level;
419: goto parse_int;
420:
1.105 markus 421: case oRekeyLimit:
422: intptr = &options->rekey_limit;
423: arg = strdelim(&s);
424: if (!arg || *arg == '\0')
425: fatal("%.200s line %d: Missing argument.", filename, linenum);
426: if (arg[0] < '0' || arg[0] > '9')
427: fatal("%.200s line %d: Bad number.", filename, linenum);
428: value = strtol(arg, &endofnumber, 10);
429: if (arg == endofnumber)
430: fatal("%.200s line %d: Bad number.", filename, linenum);
431: switch (toupper(*endofnumber)) {
432: case 'K':
433: value *= 1<<10;
434: break;
435: case 'M':
436: value *= 1<<20;
437: break;
438: case 'G':
439: value *= 1<<30;
440: break;
441: }
442: if (*activep && *intptr == -1)
443: *intptr = value;
444: break;
445:
1.17 markus 446: case oIdentityFile:
1.42 provos 447: arg = strdelim(&s);
1.40 ho 448: if (!arg || *arg == '\0')
1.17 markus 449: fatal("%.200s line %d: Missing argument.", filename, linenum);
450: if (*activep) {
1.50 markus 451: intptr = &options->num_identity_files;
1.27 markus 452: if (*intptr >= SSH_MAX_IDENTITY_FILES)
1.17 markus 453: fatal("%.200s line %d: Too many identity files specified (max %d).",
1.93 deraadt 454: filename, linenum, SSH_MAX_IDENTITY_FILES);
1.50 markus 455: charptr = &options->identity_files[*intptr];
1.38 provos 456: *charptr = xstrdup(arg);
1.27 markus 457: *intptr = *intptr + 1;
1.17 markus 458: }
459: break;
460:
1.34 markus 461: case oXAuthLocation:
462: charptr=&options->xauth_location;
463: goto parse_string;
464:
1.17 markus 465: case oUser:
466: charptr = &options->user;
467: parse_string:
1.42 provos 468: arg = strdelim(&s);
1.40 ho 469: if (!arg || *arg == '\0')
1.17 markus 470: fatal("%.200s line %d: Missing argument.", filename, linenum);
471: if (*activep && *charptr == NULL)
1.38 provos 472: *charptr = xstrdup(arg);
1.17 markus 473: break;
474:
475: case oGlobalKnownHostsFile:
476: charptr = &options->system_hostfile;
477: goto parse_string;
478:
479: case oUserKnownHostsFile:
480: charptr = &options->user_hostfile;
481: goto parse_string;
482:
1.27 markus 483: case oGlobalKnownHostsFile2:
484: charptr = &options->system_hostfile2;
485: goto parse_string;
486:
487: case oUserKnownHostsFile2:
488: charptr = &options->user_hostfile2;
489: goto parse_string;
490:
1.17 markus 491: case oHostName:
492: charptr = &options->hostname;
493: goto parse_string;
494:
1.52 markus 495: case oHostKeyAlias:
496: charptr = &options->host_key_alias;
497: goto parse_string;
498:
1.67 markus 499: case oPreferredAuthentications:
500: charptr = &options->preferred_authentications;
501: goto parse_string;
502:
1.77 markus 503: case oBindAddress:
504: charptr = &options->bind_address;
505: goto parse_string;
506:
1.85 jakob 507: case oSmartcardDevice:
1.86 markus 508: charptr = &options->smartcard_device;
509: goto parse_string;
1.85 jakob 510:
1.17 markus 511: case oProxyCommand:
512: charptr = &options->proxy_command;
1.102 markus 513: len = strspn(s, WHITESPACE "=");
1.17 markus 514: if (*activep && *charptr == NULL)
1.102 markus 515: *charptr = xstrdup(s + len);
1.17 markus 516: return 0;
517:
518: case oPort:
519: intptr = &options->port;
520: parse_int:
1.42 provos 521: arg = strdelim(&s);
1.40 ho 522: if (!arg || *arg == '\0')
1.17 markus 523: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 524: if (arg[0] < '0' || arg[0] > '9')
1.17 markus 525: fatal("%.200s line %d: Bad number.", filename, linenum);
1.21 markus 526:
527: /* Octal, decimal, or hex format? */
1.38 provos 528: value = strtol(arg, &endofnumber, 0);
529: if (arg == endofnumber)
1.21 markus 530: fatal("%.200s line %d: Bad number.", filename, linenum);
1.17 markus 531: if (*activep && *intptr == -1)
532: *intptr = value;
533: break;
534:
535: case oConnectionAttempts:
536: intptr = &options->connection_attempts;
537: goto parse_int;
538:
539: case oCipher:
540: intptr = &options->cipher;
1.42 provos 541: arg = strdelim(&s);
1.40 ho 542: if (!arg || *arg == '\0')
1.32 markus 543: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 544: value = cipher_number(arg);
1.17 markus 545: if (value == -1)
546: fatal("%.200s line %d: Bad cipher '%s'.",
1.93 deraadt 547: filename, linenum, arg ? arg : "<NONE>");
1.17 markus 548: if (*activep && *intptr == -1)
549: *intptr = value;
550: break;
551:
1.25 markus 552: case oCiphers:
1.42 provos 553: arg = strdelim(&s);
1.40 ho 554: if (!arg || *arg == '\0')
1.32 markus 555: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 556: if (!ciphers_valid(arg))
1.31 markus 557: fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.",
1.93 deraadt 558: filename, linenum, arg ? arg : "<NONE>");
1.25 markus 559: if (*activep && options->ciphers == NULL)
1.38 provos 560: options->ciphers = xstrdup(arg);
1.25 markus 561: break;
562:
1.62 markus 563: case oMacs:
564: arg = strdelim(&s);
565: if (!arg || *arg == '\0')
566: fatal("%.200s line %d: Missing argument.", filename, linenum);
567: if (!mac_valid(arg))
568: fatal("%.200s line %d: Bad SSH2 Mac spec '%s'.",
1.93 deraadt 569: filename, linenum, arg ? arg : "<NONE>");
1.62 markus 570: if (*activep && options->macs == NULL)
571: options->macs = xstrdup(arg);
572: break;
573:
1.76 markus 574: case oHostKeyAlgorithms:
575: arg = strdelim(&s);
576: if (!arg || *arg == '\0')
577: fatal("%.200s line %d: Missing argument.", filename, linenum);
578: if (!key_names_valid2(arg))
579: fatal("%.200s line %d: Bad protocol 2 host key algorithms '%s'.",
1.93 deraadt 580: filename, linenum, arg ? arg : "<NONE>");
1.76 markus 581: if (*activep && options->hostkeyalgorithms == NULL)
582: options->hostkeyalgorithms = xstrdup(arg);
583: break;
584:
1.25 markus 585: case oProtocol:
586: intptr = &options->protocol;
1.42 provos 587: arg = strdelim(&s);
1.40 ho 588: if (!arg || *arg == '\0')
1.32 markus 589: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 590: value = proto_spec(arg);
1.25 markus 591: if (value == SSH_PROTO_UNKNOWN)
592: fatal("%.200s line %d: Bad protocol spec '%s'.",
1.93 deraadt 593: filename, linenum, arg ? arg : "<NONE>");
1.25 markus 594: if (*activep && *intptr == SSH_PROTO_UNKNOWN)
595: *intptr = value;
596: break;
597:
1.17 markus 598: case oLogLevel:
599: intptr = (int *) &options->log_level;
1.42 provos 600: arg = strdelim(&s);
1.38 provos 601: value = log_level_number(arg);
1.95 markus 602: if (value == SYSLOG_LEVEL_NOT_SET)
1.64 millert 603: fatal("%.200s line %d: unsupported log level '%s'",
1.93 deraadt 604: filename, linenum, arg ? arg : "<NONE>");
1.95 markus 605: if (*activep && (LogLevel) *intptr == SYSLOG_LEVEL_NOT_SET)
1.17 markus 606: *intptr = (LogLevel) value;
607: break;
608:
1.88 stevesk 609: case oLocalForward:
1.17 markus 610: case oRemoteForward:
1.42 provos 611: arg = strdelim(&s);
1.40 ho 612: if (!arg || *arg == '\0')
1.88 stevesk 613: fatal("%.200s line %d: Missing port argument.",
614: filename, linenum);
615: if ((fwd_port = a2port(arg)) == 0)
616: fatal("%.200s line %d: Bad listen port.",
617: filename, linenum);
1.42 provos 618: arg = strdelim(&s);
1.40 ho 619: if (!arg || *arg == '\0')
1.17 markus 620: fatal("%.200s line %d: Missing second argument.",
1.88 stevesk 621: filename, linenum);
622: if (sscanf(arg, "%255[^:]:%5[0-9]", buf, sfwd_host_port) != 2 &&
623: sscanf(arg, "%255[^/]/%5[0-9]", buf, sfwd_host_port) != 2)
624: fatal("%.200s line %d: Bad forwarding specification.",
625: filename, linenum);
626: if ((fwd_host_port = a2port(sfwd_host_port)) == 0)
627: fatal("%.200s line %d: Bad forwarding port.",
628: filename, linenum);
629: if (*activep) {
630: if (opcode == oLocalForward)
631: add_local_forward(options, fwd_port, buf,
632: fwd_host_port);
633: else if (opcode == oRemoteForward)
634: add_remote_forward(options, fwd_port, buf,
635: fwd_host_port);
636: }
1.17 markus 637: break;
1.71 markus 638:
639: case oDynamicForward:
640: arg = strdelim(&s);
641: if (!arg || *arg == '\0')
642: fatal("%.200s line %d: Missing port argument.",
643: filename, linenum);
1.74 stevesk 644: fwd_port = a2port(arg);
645: if (fwd_port == 0)
1.71 markus 646: fatal("%.200s line %d: Badly formatted port number.",
647: filename, linenum);
1.87 markus 648: if (*activep)
649: add_local_forward(options, fwd_port, "socks4", 0);
1.72 markus 650: break;
1.17 markus 651:
1.90 stevesk 652: case oClearAllForwardings:
653: intptr = &options->clear_forwardings;
654: goto parse_flag;
655:
1.17 markus 656: case oHost:
657: *activep = 0;
1.42 provos 658: while ((arg = strdelim(&s)) != NULL && *arg != '\0')
1.38 provos 659: if (match_pattern(host, arg)) {
660: debug("Applying options for %.100s", arg);
1.17 markus 661: *activep = 1;
662: break;
663: }
1.42 provos 664: /* Avoid garbage check below, as strdelim is done. */
1.17 markus 665: return 0;
666:
667: case oEscapeChar:
668: intptr = &options->escape_char;
1.42 provos 669: arg = strdelim(&s);
1.40 ho 670: if (!arg || *arg == '\0')
1.17 markus 671: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 672: if (arg[0] == '^' && arg[2] == 0 &&
1.51 markus 673: (u_char) arg[1] >= 64 && (u_char) arg[1] < 128)
674: value = (u_char) arg[1] & 31;
1.38 provos 675: else if (strlen(arg) == 1)
1.51 markus 676: value = (u_char) arg[0];
1.38 provos 677: else if (strcmp(arg, "none") == 0)
1.79 stevesk 678: value = SSH_ESCAPECHAR_NONE;
1.17 markus 679: else {
680: fatal("%.200s line %d: Bad escape character.",
1.93 deraadt 681: filename, linenum);
1.17 markus 682: /* NOTREACHED */
683: value = 0; /* Avoid compiler warning. */
684: }
685: if (*activep && *intptr == -1)
686: *intptr = value;
687: break;
688:
1.101 markus 689: case oEnableSSHKeysign:
690: intptr = &options->enable_ssh_keysign;
691: goto parse_flag;
692:
1.96 markus 693: case oDeprecated:
1.98 markus 694: debug("%s line %d: Deprecated option \"%s\"",
1.96 markus 695: filename, linenum, keyword);
1.98 markus 696: return 0;
1.96 markus 697:
1.17 markus 698: default:
699: fatal("process_config_line: Unimplemented opcode %d", opcode);
700: }
701:
702: /* Check that there is no garbage at end of line. */
1.57 djm 703: if ((arg = strdelim(&s)) != NULL && *arg != '\0') {
1.39 ho 704: fatal("%.200s line %d: garbage at end of line; \"%.200s\".",
1.93 deraadt 705: filename, linenum, arg);
1.39 ho 706: }
1.17 markus 707: return 0;
1.1 deraadt 708: }
709:
710:
1.19 markus 711: /*
712: * Reads the config file and modifies the options accordingly. Options
713: * should already be initialized before this call. This never returns if
1.89 stevesk 714: * there is an error. If the file does not exist, this returns 0.
1.19 markus 715: */
1.1 deraadt 716:
1.89 stevesk 717: int
1.17 markus 718: read_config_file(const char *filename, const char *host, Options *options)
1.1 deraadt 719: {
1.17 markus 720: FILE *f;
721: char line[1024];
722: int active, linenum;
723: int bad_options = 0;
724:
725: /* Open the file. */
726: f = fopen(filename, "r");
727: if (!f)
1.89 stevesk 728: return 0;
1.17 markus 729:
730: debug("Reading configuration data %.200s", filename);
731:
1.19 markus 732: /*
733: * Mark that we are now processing the options. This flag is turned
734: * on/off by Host specifications.
735: */
1.17 markus 736: active = 1;
737: linenum = 0;
738: while (fgets(line, sizeof(line), f)) {
739: /* Update line number counter. */
740: linenum++;
741: if (process_config_line(options, host, line, filename, linenum, &active) != 0)
742: bad_options++;
743: }
744: fclose(f);
745: if (bad_options > 0)
1.64 millert 746: fatal("%s: terminating, %d bad configuration options",
1.93 deraadt 747: filename, bad_options);
1.89 stevesk 748: return 1;
1.1 deraadt 749: }
750:
1.19 markus 751: /*
752: * Initializes options to special values that indicate that they have not yet
753: * been set. Read_config_file will only set options with this value. Options
754: * are processed in the following order: command line, user config file,
755: * system config file. Last, fill_default_options is called.
756: */
1.1 deraadt 757:
1.26 markus 758: void
1.17 markus 759: initialize_options(Options * options)
1.1 deraadt 760: {
1.17 markus 761: memset(options, 'X', sizeof(*options));
762: options->forward_agent = -1;
763: options->forward_x11 = -1;
1.34 markus 764: options->xauth_location = NULL;
1.17 markus 765: options->gateway_ports = -1;
766: options->use_privileged_port = -1;
767: options->rhosts_authentication = -1;
768: options->rsa_authentication = -1;
1.50 markus 769: options->pubkey_authentication = -1;
1.78 markus 770: options->challenge_response_authentication = -1;
1.17 markus 771: options->kerberos_authentication = -1;
1.82 dugsong 772: options->kerberos_tgt_passing = -1;
1.17 markus 773: options->afs_token_passing = -1;
774: options->password_authentication = -1;
1.48 markus 775: options->kbd_interactive_authentication = -1;
776: options->kbd_interactive_devices = NULL;
1.17 markus 777: options->rhosts_rsa_authentication = -1;
1.72 markus 778: options->hostbased_authentication = -1;
1.17 markus 779: options->batch_mode = -1;
780: options->check_host_ip = -1;
781: options->strict_host_key_checking = -1;
782: options->compression = -1;
783: options->keepalives = -1;
784: options->compression_level = -1;
785: options->port = -1;
786: options->connection_attempts = -1;
787: options->number_of_password_prompts = -1;
788: options->cipher = -1;
1.25 markus 789: options->ciphers = NULL;
1.62 markus 790: options->macs = NULL;
1.76 markus 791: options->hostkeyalgorithms = NULL;
1.25 markus 792: options->protocol = SSH_PROTO_UNKNOWN;
1.17 markus 793: options->num_identity_files = 0;
794: options->hostname = NULL;
1.52 markus 795: options->host_key_alias = NULL;
1.17 markus 796: options->proxy_command = NULL;
797: options->user = NULL;
798: options->escape_char = -1;
799: options->system_hostfile = NULL;
800: options->user_hostfile = NULL;
1.27 markus 801: options->system_hostfile2 = NULL;
802: options->user_hostfile2 = NULL;
1.17 markus 803: options->num_local_forwards = 0;
804: options->num_remote_forwards = 0;
1.90 stevesk 805: options->clear_forwardings = -1;
1.95 markus 806: options->log_level = SYSLOG_LEVEL_NOT_SET;
1.67 markus 807: options->preferred_authentications = NULL;
1.77 markus 808: options->bind_address = NULL;
1.86 markus 809: options->smartcard_device = NULL;
1.101 markus 810: options->enable_ssh_keysign = - 1;
1.91 markus 811: options->no_host_authentication_for_localhost = - 1;
1.105 markus 812: options->rekey_limit = - 1;
1.107 jakob 813: options->verify_host_key_dns = -1;
1.1 deraadt 814: }
815:
1.19 markus 816: /*
817: * Called after processing other sources of option data, this fills those
818: * options for which no value has been specified with their default values.
819: */
1.1 deraadt 820:
1.26 markus 821: void
1.17 markus 822: fill_default_options(Options * options)
1.1 deraadt 823: {
1.61 deraadt 824: int len;
825:
1.17 markus 826: if (options->forward_agent == -1)
1.33 markus 827: options->forward_agent = 0;
1.17 markus 828: if (options->forward_x11 == -1)
1.23 markus 829: options->forward_x11 = 0;
1.34 markus 830: if (options->xauth_location == NULL)
1.80 markus 831: options->xauth_location = _PATH_XAUTH;
1.17 markus 832: if (options->gateway_ports == -1)
833: options->gateway_ports = 0;
834: if (options->use_privileged_port == -1)
1.65 markus 835: options->use_privileged_port = 0;
1.17 markus 836: if (options->rhosts_authentication == -1)
1.99 stevesk 837: options->rhosts_authentication = 0;
1.17 markus 838: if (options->rsa_authentication == -1)
839: options->rsa_authentication = 1;
1.50 markus 840: if (options->pubkey_authentication == -1)
841: options->pubkey_authentication = 1;
1.78 markus 842: if (options->challenge_response_authentication == -1)
1.83 markus 843: options->challenge_response_authentication = 1;
1.17 markus 844: if (options->kerberos_authentication == -1)
1.109 ! jakob 845: #if defined(KRB4) || defined(KRB5)
1.45 provos 846: options->kerberos_authentication = 1;
1.109 ! jakob 847: #else
! 848: options->kerberos_authentication = 0;
! 849: #endif
1.17 markus 850: if (options->kerberos_tgt_passing == -1)
1.109 ! jakob 851: #if defined(KRB4) || defined(KRB5)
1.17 markus 852: options->kerberos_tgt_passing = 1;
1.109 ! jakob 853: #else
! 854: options->kerberos_tgt_passing = 0;
! 855: #endif
1.17 markus 856: if (options->afs_token_passing == -1)
1.109 ! jakob 857: #if defined(AFS)
1.17 markus 858: options->afs_token_passing = 1;
1.109 ! jakob 859: #else
! 860: options->afs_token_passing = 0;
! 861: #endif
1.17 markus 862: if (options->password_authentication == -1)
863: options->password_authentication = 1;
1.48 markus 864: if (options->kbd_interactive_authentication == -1)
1.59 markus 865: options->kbd_interactive_authentication = 1;
1.17 markus 866: if (options->rhosts_rsa_authentication == -1)
1.99 stevesk 867: options->rhosts_rsa_authentication = 0;
1.72 markus 868: if (options->hostbased_authentication == -1)
869: options->hostbased_authentication = 0;
1.17 markus 870: if (options->batch_mode == -1)
871: options->batch_mode = 0;
872: if (options->check_host_ip == -1)
873: options->check_host_ip = 1;
874: if (options->strict_host_key_checking == -1)
875: options->strict_host_key_checking = 2; /* 2 is default */
876: if (options->compression == -1)
877: options->compression = 0;
878: if (options->keepalives == -1)
879: options->keepalives = 1;
880: if (options->compression_level == -1)
881: options->compression_level = 6;
882: if (options->port == -1)
883: options->port = 0; /* Filled in ssh_connect. */
884: if (options->connection_attempts == -1)
1.84 markus 885: options->connection_attempts = 1;
1.17 markus 886: if (options->number_of_password_prompts == -1)
887: options->number_of_password_prompts = 3;
888: /* Selected in ssh_login(). */
889: if (options->cipher == -1)
890: options->cipher = SSH_CIPHER_NOT_SET;
1.31 markus 891: /* options->ciphers, default set in myproposals.h */
1.62 markus 892: /* options->macs, default set in myproposals.h */
1.76 markus 893: /* options->hostkeyalgorithms, default set in myproposals.h */
1.25 markus 894: if (options->protocol == SSH_PROTO_UNKNOWN)
1.69 markus 895: options->protocol = SSH_PROTO_1|SSH_PROTO_2;
1.17 markus 896: if (options->num_identity_files == 0) {
1.50 markus 897: if (options->protocol & SSH_PROTO_1) {
1.61 deraadt 898: len = 2 + strlen(_PATH_SSH_CLIENT_IDENTITY) + 1;
1.50 markus 899: options->identity_files[options->num_identity_files] =
1.61 deraadt 900: xmalloc(len);
901: snprintf(options->identity_files[options->num_identity_files++],
902: len, "~/%.100s", _PATH_SSH_CLIENT_IDENTITY);
1.50 markus 903: }
904: if (options->protocol & SSH_PROTO_2) {
1.63 deraadt 905: len = 2 + strlen(_PATH_SSH_CLIENT_ID_RSA) + 1;
906: options->identity_files[options->num_identity_files] =
907: xmalloc(len);
908: snprintf(options->identity_files[options->num_identity_files++],
909: len, "~/%.100s", _PATH_SSH_CLIENT_ID_RSA);
910:
1.61 deraadt 911: len = 2 + strlen(_PATH_SSH_CLIENT_ID_DSA) + 1;
1.50 markus 912: options->identity_files[options->num_identity_files] =
1.61 deraadt 913: xmalloc(len);
914: snprintf(options->identity_files[options->num_identity_files++],
915: len, "~/%.100s", _PATH_SSH_CLIENT_ID_DSA);
1.50 markus 916: }
1.27 markus 917: }
1.17 markus 918: if (options->escape_char == -1)
919: options->escape_char = '~';
920: if (options->system_hostfile == NULL)
1.55 markus 921: options->system_hostfile = _PATH_SSH_SYSTEM_HOSTFILE;
1.17 markus 922: if (options->user_hostfile == NULL)
1.55 markus 923: options->user_hostfile = _PATH_SSH_USER_HOSTFILE;
1.27 markus 924: if (options->system_hostfile2 == NULL)
1.55 markus 925: options->system_hostfile2 = _PATH_SSH_SYSTEM_HOSTFILE2;
1.27 markus 926: if (options->user_hostfile2 == NULL)
1.55 markus 927: options->user_hostfile2 = _PATH_SSH_USER_HOSTFILE2;
1.95 markus 928: if (options->log_level == SYSLOG_LEVEL_NOT_SET)
1.54 markus 929: options->log_level = SYSLOG_LEVEL_INFO;
1.90 stevesk 930: if (options->clear_forwardings == 1)
931: clear_forwardings(options);
1.91 markus 932: if (options->no_host_authentication_for_localhost == - 1)
933: options->no_host_authentication_for_localhost = 0;
1.101 markus 934: if (options->enable_ssh_keysign == -1)
935: options->enable_ssh_keysign = 0;
1.105 markus 936: if (options->rekey_limit == -1)
937: options->rekey_limit = 0;
1.107 jakob 938: if (options->verify_host_key_dns == -1)
939: options->verify_host_key_dns = 0;
1.17 markus 940: /* options->proxy_command should not be set by default */
941: /* options->user will be set in the main program if appropriate */
942: /* options->hostname will be set in the main program if appropriate */
1.52 markus 943: /* options->host_key_alias should not be set by default */
1.67 markus 944: /* options->preferred_authentications will be set in ssh */
1.1 deraadt 945: }
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