Annotation of src/usr.bin/ssh/readconf.c, Revision 1.91.2.2
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"
1.91.2.2! miod 15: RCSID("$OpenBSD: readconf.c,v 1.91.2.1 2002/03/07 17:37:47 jason 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
1.91.2.2! miod 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
1.91.2.2! miod 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,
1.91.2.2! miod 95: oPasswordAuthentication, oRSAAuthentication,
1.59 markus 96: oChallengeResponseAuthentication, oXAuthLocation,
1.82 dugsong 97: #if defined(KRB4) || defined(KRB5)
1.17 markus 98: oKerberosAuthentication,
1.82 dugsong 99: #endif
100: #if defined(AFS) || defined(KRB5)
101: oKerberosTgtPassing,
102: #endif
1.1 deraadt 103: #ifdef AFS
1.82 dugsong 104: oAFSTokenPassing,
1.1 deraadt 105: #endif
1.17 markus 106: oIdentityFile, oHostName, oPort, oCipher, oRemoteForward, oLocalForward,
107: oUser, oHost, oEscapeChar, oRhostsRSAAuthentication, oProxyCommand,
108: oGlobalKnownHostsFile, oUserKnownHostsFile, oConnectionAttempts,
109: oBatchMode, oCheckHostIP, oStrictHostKeyChecking, oCompression,
1.59 markus 110: oCompressionLevel, oKeepAlives, oNumberOfPasswordPrompts,
1.62 markus 111: oUsePrivilegedPort, oLogLevel, oCiphers, oProtocol, oMacs,
1.50 markus 112: oGlobalKnownHostsFile2, oUserKnownHostsFile2, oPubkeyAuthentication,
1.67 markus 113: oKbdInteractiveAuthentication, oKbdInteractiveDevices, oHostKeyAlias,
1.76 markus 114: oDynamicForward, oPreferredAuthentications, oHostbasedAuthentication,
1.90 stevesk 115: oHostKeyAlgorithms, oBindAddress, oSmartcardDevice,
1.91.2.2! miod 116: oClearAllForwardings, oNoHostAuthenticationForLocalhost,
! 117: oDeprecated
1.1 deraadt 118: } OpCodes;
119:
120: /* Textual representations of the tokens. */
121:
1.17 markus 122: static struct {
123: const char *name;
124: OpCodes opcode;
125: } keywords[] = {
126: { "forwardagent", oForwardAgent },
127: { "forwardx11", oForwardX11 },
1.34 markus 128: { "xauthlocation", oXAuthLocation },
1.17 markus 129: { "gatewayports", oGatewayPorts },
130: { "useprivilegedport", oUsePrivilegedPort },
131: { "rhostsauthentication", oRhostsAuthentication },
132: { "passwordauthentication", oPasswordAuthentication },
1.48 markus 133: { "kbdinteractiveauthentication", oKbdInteractiveAuthentication },
134: { "kbdinteractivedevices", oKbdInteractiveDevices },
1.17 markus 135: { "rsaauthentication", oRSAAuthentication },
1.50 markus 136: { "pubkeyauthentication", oPubkeyAuthentication },
1.59 markus 137: { "dsaauthentication", oPubkeyAuthentication }, /* alias */
1.72 markus 138: { "rhostsrsaauthentication", oRhostsRSAAuthentication },
1.73 markus 139: { "hostbasedauthentication", oHostbasedAuthentication },
1.59 markus 140: { "challengeresponseauthentication", oChallengeResponseAuthentication },
141: { "skeyauthentication", oChallengeResponseAuthentication }, /* alias */
142: { "tisauthentication", oChallengeResponseAuthentication }, /* alias */
1.82 dugsong 143: #if defined(KRB4) || defined(KRB5)
1.17 markus 144: { "kerberosauthentication", oKerberosAuthentication },
1.82 dugsong 145: #endif
146: #if defined(AFS) || defined(KRB5)
147: { "kerberostgtpassing", oKerberosTgtPassing },
148: #endif
1.5 dugsong 149: #ifdef AFS
1.17 markus 150: { "afstokenpassing", oAFSTokenPassing },
1.1 deraadt 151: #endif
1.91.2.2! miod 152: { "fallbacktorsh", oDeprecated },
! 153: { "usersh", oDeprecated },
1.17 markus 154: { "identityfile", oIdentityFile },
1.50 markus 155: { "identityfile2", oIdentityFile }, /* alias */
1.17 markus 156: { "hostname", oHostName },
1.52 markus 157: { "hostkeyalias", oHostKeyAlias },
1.17 markus 158: { "proxycommand", oProxyCommand },
159: { "port", oPort },
160: { "cipher", oCipher },
1.25 markus 161: { "ciphers", oCiphers },
1.62 markus 162: { "macs", oMacs },
1.25 markus 163: { "protocol", oProtocol },
1.17 markus 164: { "remoteforward", oRemoteForward },
165: { "localforward", oLocalForward },
166: { "user", oUser },
167: { "host", oHost },
168: { "escapechar", oEscapeChar },
169: { "globalknownhostsfile", oGlobalKnownHostsFile },
1.81 markus 170: { "userknownhostsfile", oUserKnownHostsFile }, /* obsolete */
1.27 markus 171: { "globalknownhostsfile2", oGlobalKnownHostsFile2 },
1.81 markus 172: { "userknownhostsfile2", oUserKnownHostsFile2 }, /* obsolete */
1.17 markus 173: { "connectionattempts", oConnectionAttempts },
174: { "batchmode", oBatchMode },
175: { "checkhostip", oCheckHostIP },
176: { "stricthostkeychecking", oStrictHostKeyChecking },
177: { "compression", oCompression },
178: { "compressionlevel", oCompressionLevel },
179: { "keepalive", oKeepAlives },
180: { "numberofpasswordprompts", oNumberOfPasswordPrompts },
181: { "loglevel", oLogLevel },
1.71 markus 182: { "dynamicforward", oDynamicForward },
1.67 markus 183: { "preferredauthentications", oPreferredAuthentications },
1.76 markus 184: { "hostkeyalgorithms", oHostKeyAlgorithms },
1.77 markus 185: { "bindaddress", oBindAddress },
1.85 jakob 186: { "smartcarddevice", oSmartcardDevice },
1.91.2.1 jason 187: { "clearallforwardings", oClearAllForwardings },
188: { "nohostauthenticationforlocalhost", oNoHostAuthenticationForLocalhost },
189: { NULL, oBadOption }
1.13 markus 190: };
191:
1.19 markus 192: /*
193: * Adds a local TCP/IP port forward to options. Never returns if there is an
194: * error.
195: */
1.1 deraadt 196:
1.26 markus 197: void
1.22 markus 198: add_local_forward(Options *options, u_short port, const char *host,
199: u_short host_port)
1.1 deraadt 200: {
1.17 markus 201: Forward *fwd;
202: extern uid_t original_real_uid;
203: if (port < IPPORT_RESERVED && original_real_uid != 0)
1.64 millert 204: fatal("Privileged ports can only be forwarded by root.");
1.17 markus 205: if (options->num_local_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
206: fatal("Too many local forwards (max %d).", SSH_MAX_FORWARDS_PER_DIRECTION);
207: fwd = &options->local_forwards[options->num_local_forwards++];
208: fwd->port = port;
209: fwd->host = xstrdup(host);
210: fwd->host_port = host_port;
1.1 deraadt 211: }
212:
1.19 markus 213: /*
214: * Adds a remote TCP/IP port forward to options. Never returns if there is
215: * an error.
216: */
1.1 deraadt 217:
1.26 markus 218: void
1.22 markus 219: add_remote_forward(Options *options, u_short port, const char *host,
220: u_short host_port)
1.1 deraadt 221: {
1.17 markus 222: Forward *fwd;
223: if (options->num_remote_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
224: fatal("Too many remote forwards (max %d).",
1.91.2.1 jason 225: SSH_MAX_FORWARDS_PER_DIRECTION);
1.17 markus 226: fwd = &options->remote_forwards[options->num_remote_forwards++];
227: fwd->port = port;
228: fwd->host = xstrdup(host);
229: fwd->host_port = host_port;
1.1 deraadt 230: }
231:
1.90 stevesk 232: static void
233: clear_forwardings(Options *options)
234: {
235: int i;
236:
237: for (i = 0; i < options->num_local_forwards; i++)
238: xfree(options->local_forwards[i].host);
239: options->num_local_forwards = 0;
240: for (i = 0; i < options->num_remote_forwards; i++)
241: xfree(options->remote_forwards[i].host);
242: options->num_remote_forwards = 0;
243: }
244:
1.19 markus 245: /*
1.70 stevesk 246: * Returns the number of the token pointed to by cp or oBadOption.
1.19 markus 247: */
1.1 deraadt 248:
1.26 markus 249: static OpCodes
1.17 markus 250: parse_token(const char *cp, const char *filename, int linenum)
1.1 deraadt 251: {
1.51 markus 252: u_int i;
1.1 deraadt 253:
1.17 markus 254: for (i = 0; keywords[i].name; i++)
1.20 markus 255: if (strcasecmp(cp, keywords[i].name) == 0)
1.17 markus 256: return keywords[i].opcode;
257:
1.75 stevesk 258: error("%s: line %d: Bad configuration option: %s",
259: filename, linenum, cp);
1.17 markus 260: return oBadOption;
1.1 deraadt 261: }
262:
1.19 markus 263: /*
264: * Processes a single option line as used in the configuration files. This
265: * only sets those values that have not already been set.
266: */
1.1 deraadt 267:
1.14 markus 268: int
269: process_config_line(Options *options, const char *host,
1.17 markus 270: char *line, const char *filename, int linenum,
271: int *activep)
1.1 deraadt 272: {
1.38 provos 273: char buf[256], *s, *string, **charptr, *endofnumber, *keyword, *arg;
1.22 markus 274: int opcode, *intptr, value;
275: u_short fwd_port, fwd_host_port;
1.88 stevesk 276: char sfwd_host_port[6];
1.1 deraadt 277:
1.42 provos 278: s = line;
279: /* Get the keyword. (Each line is supposed to begin with a keyword). */
280: keyword = strdelim(&s);
281: /* Ignore leading whitespace. */
282: if (*keyword == '\0')
1.43 markus 283: keyword = strdelim(&s);
1.56 deraadt 284: if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#')
1.17 markus 285: return 0;
286:
1.38 provos 287: opcode = parse_token(keyword, filename, linenum);
1.17 markus 288:
289: switch (opcode) {
290: case oBadOption:
1.19 markus 291: /* don't panic, but count bad options */
292: return -1;
1.17 markus 293: /* NOTREACHED */
294: case oForwardAgent:
295: intptr = &options->forward_agent;
296: parse_flag:
1.42 provos 297: arg = strdelim(&s);
1.40 ho 298: if (!arg || *arg == '\0')
1.17 markus 299: fatal("%.200s line %d: Missing yes/no argument.", filename, linenum);
300: value = 0; /* To avoid compiler warning... */
1.38 provos 301: if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
1.17 markus 302: value = 1;
1.38 provos 303: else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
1.17 markus 304: value = 0;
305: else
306: fatal("%.200s line %d: Bad yes/no argument.", filename, linenum);
307: if (*activep && *intptr == -1)
308: *intptr = value;
309: break;
310:
311: case oForwardX11:
312: intptr = &options->forward_x11;
313: goto parse_flag;
314:
315: case oGatewayPorts:
316: intptr = &options->gateway_ports;
317: goto parse_flag;
318:
319: case oUsePrivilegedPort:
320: intptr = &options->use_privileged_port;
321: goto parse_flag;
322:
323: case oRhostsAuthentication:
324: intptr = &options->rhosts_authentication;
325: goto parse_flag;
326:
327: case oPasswordAuthentication:
328: intptr = &options->password_authentication;
329: goto parse_flag;
330:
1.48 markus 331: case oKbdInteractiveAuthentication:
332: intptr = &options->kbd_interactive_authentication;
333: goto parse_flag;
334:
335: case oKbdInteractiveDevices:
336: charptr = &options->kbd_interactive_devices;
337: goto parse_string;
338:
1.50 markus 339: case oPubkeyAuthentication:
340: intptr = &options->pubkey_authentication;
1.30 markus 341: goto parse_flag;
342:
1.17 markus 343: case oRSAAuthentication:
344: intptr = &options->rsa_authentication;
345: goto parse_flag;
346:
347: case oRhostsRSAAuthentication:
348: intptr = &options->rhosts_rsa_authentication;
349: goto parse_flag;
350:
1.72 markus 351: case oHostbasedAuthentication:
352: intptr = &options->hostbased_authentication;
353: goto parse_flag;
354:
1.59 markus 355: case oChallengeResponseAuthentication:
1.78 markus 356: intptr = &options->challenge_response_authentication;
1.17 markus 357: goto parse_flag;
1.82 dugsong 358: #if defined(KRB4) || defined(KRB5)
1.17 markus 359: case oKerberosAuthentication:
360: intptr = &options->kerberos_authentication;
361: goto parse_flag;
1.82 dugsong 362: #endif
363: #if defined(AFS) || defined(KRB5)
1.17 markus 364: case oKerberosTgtPassing:
365: intptr = &options->kerberos_tgt_passing;
366: goto parse_flag;
1.82 dugsong 367: #endif
368: #ifdef AFS
1.17 markus 369: case oAFSTokenPassing:
370: intptr = &options->afs_token_passing;
371: goto parse_flag;
1.1 deraadt 372: #endif
1.17 markus 373: case oBatchMode:
374: intptr = &options->batch_mode;
375: goto parse_flag;
376:
377: case oCheckHostIP:
378: intptr = &options->check_host_ip;
379: goto parse_flag;
380:
381: case oStrictHostKeyChecking:
382: intptr = &options->strict_host_key_checking;
1.42 provos 383: arg = strdelim(&s);
1.40 ho 384: if (!arg || *arg == '\0')
1.60 stevesk 385: fatal("%.200s line %d: Missing yes/no/ask argument.",
1.91.2.1 jason 386: filename, linenum);
1.17 markus 387: value = 0; /* To avoid compiler warning... */
1.38 provos 388: if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
1.17 markus 389: value = 1;
1.38 provos 390: else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
1.17 markus 391: value = 0;
1.38 provos 392: else if (strcmp(arg, "ask") == 0)
1.17 markus 393: value = 2;
394: else
395: fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum);
396: if (*activep && *intptr == -1)
397: *intptr = value;
398: break;
399:
400: case oCompression:
401: intptr = &options->compression;
402: goto parse_flag;
403:
404: case oKeepAlives:
405: intptr = &options->keepalives;
406: goto parse_flag;
407:
1.91 markus 408: case oNoHostAuthenticationForLocalhost:
409: intptr = &options->no_host_authentication_for_localhost;
410: goto parse_flag;
411:
1.17 markus 412: case oNumberOfPasswordPrompts:
413: intptr = &options->number_of_password_prompts;
414: goto parse_int;
415:
416: case oCompressionLevel:
417: intptr = &options->compression_level;
418: goto parse_int;
419:
420: case oIdentityFile:
1.42 provos 421: arg = strdelim(&s);
1.40 ho 422: if (!arg || *arg == '\0')
1.17 markus 423: fatal("%.200s line %d: Missing argument.", filename, linenum);
424: if (*activep) {
1.50 markus 425: intptr = &options->num_identity_files;
1.27 markus 426: if (*intptr >= SSH_MAX_IDENTITY_FILES)
1.17 markus 427: fatal("%.200s line %d: Too many identity files specified (max %d).",
1.91.2.1 jason 428: filename, linenum, SSH_MAX_IDENTITY_FILES);
1.50 markus 429: charptr = &options->identity_files[*intptr];
1.38 provos 430: *charptr = xstrdup(arg);
1.27 markus 431: *intptr = *intptr + 1;
1.17 markus 432: }
433: break;
434:
1.34 markus 435: case oXAuthLocation:
436: charptr=&options->xauth_location;
437: goto parse_string;
438:
1.17 markus 439: case oUser:
440: charptr = &options->user;
441: parse_string:
1.42 provos 442: arg = strdelim(&s);
1.40 ho 443: if (!arg || *arg == '\0')
1.17 markus 444: fatal("%.200s line %d: Missing argument.", filename, linenum);
445: if (*activep && *charptr == NULL)
1.38 provos 446: *charptr = xstrdup(arg);
1.17 markus 447: break;
448:
449: case oGlobalKnownHostsFile:
450: charptr = &options->system_hostfile;
451: goto parse_string;
452:
453: case oUserKnownHostsFile:
454: charptr = &options->user_hostfile;
455: goto parse_string;
456:
1.27 markus 457: case oGlobalKnownHostsFile2:
458: charptr = &options->system_hostfile2;
459: goto parse_string;
460:
461: case oUserKnownHostsFile2:
462: charptr = &options->user_hostfile2;
463: goto parse_string;
464:
1.17 markus 465: case oHostName:
466: charptr = &options->hostname;
467: goto parse_string;
468:
1.52 markus 469: case oHostKeyAlias:
470: charptr = &options->host_key_alias;
471: goto parse_string;
472:
1.67 markus 473: case oPreferredAuthentications:
474: charptr = &options->preferred_authentications;
475: goto parse_string;
476:
1.77 markus 477: case oBindAddress:
478: charptr = &options->bind_address;
479: goto parse_string;
480:
1.85 jakob 481: case oSmartcardDevice:
1.86 markus 482: charptr = &options->smartcard_device;
483: goto parse_string;
1.85 jakob 484:
1.17 markus 485: case oProxyCommand:
486: charptr = &options->proxy_command;
487: string = xstrdup("");
1.42 provos 488: while ((arg = strdelim(&s)) != NULL && *arg != '\0') {
1.38 provos 489: string = xrealloc(string, strlen(string) + strlen(arg) + 2);
1.17 markus 490: strcat(string, " ");
1.38 provos 491: strcat(string, arg);
1.17 markus 492: }
493: if (*activep && *charptr == NULL)
494: *charptr = string;
495: else
496: xfree(string);
497: return 0;
498:
499: case oPort:
500: intptr = &options->port;
501: parse_int:
1.42 provos 502: arg = strdelim(&s);
1.40 ho 503: if (!arg || *arg == '\0')
1.17 markus 504: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 505: if (arg[0] < '0' || arg[0] > '9')
1.17 markus 506: fatal("%.200s line %d: Bad number.", filename, linenum);
1.21 markus 507:
508: /* Octal, decimal, or hex format? */
1.38 provos 509: value = strtol(arg, &endofnumber, 0);
510: if (arg == endofnumber)
1.21 markus 511: fatal("%.200s line %d: Bad number.", filename, linenum);
1.17 markus 512: if (*activep && *intptr == -1)
513: *intptr = value;
514: break;
515:
516: case oConnectionAttempts:
517: intptr = &options->connection_attempts;
518: goto parse_int;
519:
520: case oCipher:
521: intptr = &options->cipher;
1.42 provos 522: arg = strdelim(&s);
1.40 ho 523: if (!arg || *arg == '\0')
1.32 markus 524: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 525: value = cipher_number(arg);
1.17 markus 526: if (value == -1)
527: fatal("%.200s line %d: Bad cipher '%s'.",
1.91.2.1 jason 528: filename, linenum, arg ? arg : "<NONE>");
1.17 markus 529: if (*activep && *intptr == -1)
530: *intptr = value;
531: break;
532:
1.25 markus 533: case oCiphers:
1.42 provos 534: arg = strdelim(&s);
1.40 ho 535: if (!arg || *arg == '\0')
1.32 markus 536: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 537: if (!ciphers_valid(arg))
1.31 markus 538: fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.",
1.91.2.1 jason 539: filename, linenum, arg ? arg : "<NONE>");
1.25 markus 540: if (*activep && options->ciphers == NULL)
1.38 provos 541: options->ciphers = xstrdup(arg);
1.25 markus 542: break;
543:
1.62 markus 544: case oMacs:
545: arg = strdelim(&s);
546: if (!arg || *arg == '\0')
547: fatal("%.200s line %d: Missing argument.", filename, linenum);
548: if (!mac_valid(arg))
549: fatal("%.200s line %d: Bad SSH2 Mac spec '%s'.",
1.91.2.1 jason 550: filename, linenum, arg ? arg : "<NONE>");
1.62 markus 551: if (*activep && options->macs == NULL)
552: options->macs = xstrdup(arg);
553: break;
554:
1.76 markus 555: case oHostKeyAlgorithms:
556: arg = strdelim(&s);
557: if (!arg || *arg == '\0')
558: fatal("%.200s line %d: Missing argument.", filename, linenum);
559: if (!key_names_valid2(arg))
560: fatal("%.200s line %d: Bad protocol 2 host key algorithms '%s'.",
1.91.2.1 jason 561: filename, linenum, arg ? arg : "<NONE>");
1.76 markus 562: if (*activep && options->hostkeyalgorithms == NULL)
563: options->hostkeyalgorithms = xstrdup(arg);
564: break;
565:
1.25 markus 566: case oProtocol:
567: intptr = &options->protocol;
1.42 provos 568: arg = strdelim(&s);
1.40 ho 569: if (!arg || *arg == '\0')
1.32 markus 570: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 571: value = proto_spec(arg);
1.25 markus 572: if (value == SSH_PROTO_UNKNOWN)
573: fatal("%.200s line %d: Bad protocol spec '%s'.",
1.91.2.1 jason 574: filename, linenum, arg ? arg : "<NONE>");
1.25 markus 575: if (*activep && *intptr == SSH_PROTO_UNKNOWN)
576: *intptr = value;
577: break;
578:
1.17 markus 579: case oLogLevel:
580: intptr = (int *) &options->log_level;
1.42 provos 581: arg = strdelim(&s);
1.38 provos 582: value = log_level_number(arg);
1.91.2.1 jason 583: if (value == SYSLOG_LEVEL_NOT_SET)
1.64 millert 584: fatal("%.200s line %d: unsupported log level '%s'",
1.91.2.1 jason 585: filename, linenum, arg ? arg : "<NONE>");
586: if (*activep && (LogLevel) *intptr == SYSLOG_LEVEL_NOT_SET)
1.17 markus 587: *intptr = (LogLevel) value;
588: break;
589:
1.88 stevesk 590: case oLocalForward:
1.17 markus 591: case oRemoteForward:
1.42 provos 592: arg = strdelim(&s);
1.40 ho 593: if (!arg || *arg == '\0')
1.88 stevesk 594: fatal("%.200s line %d: Missing port argument.",
595: filename, linenum);
596: if ((fwd_port = a2port(arg)) == 0)
597: fatal("%.200s line %d: Bad listen port.",
598: filename, linenum);
1.42 provos 599: arg = strdelim(&s);
1.40 ho 600: if (!arg || *arg == '\0')
1.17 markus 601: fatal("%.200s line %d: Missing second argument.",
1.88 stevesk 602: filename, linenum);
603: if (sscanf(arg, "%255[^:]:%5[0-9]", buf, sfwd_host_port) != 2 &&
604: sscanf(arg, "%255[^/]/%5[0-9]", buf, sfwd_host_port) != 2)
605: fatal("%.200s line %d: Bad forwarding specification.",
606: filename, linenum);
607: if ((fwd_host_port = a2port(sfwd_host_port)) == 0)
608: fatal("%.200s line %d: Bad forwarding port.",
609: filename, linenum);
610: if (*activep) {
611: if (opcode == oLocalForward)
612: add_local_forward(options, fwd_port, buf,
613: fwd_host_port);
614: else if (opcode == oRemoteForward)
615: add_remote_forward(options, fwd_port, buf,
616: fwd_host_port);
617: }
1.17 markus 618: break;
1.71 markus 619:
620: case oDynamicForward:
621: arg = strdelim(&s);
622: if (!arg || *arg == '\0')
623: fatal("%.200s line %d: Missing port argument.",
624: filename, linenum);
1.74 stevesk 625: fwd_port = a2port(arg);
626: if (fwd_port == 0)
1.71 markus 627: fatal("%.200s line %d: Badly formatted port number.",
628: filename, linenum);
1.87 markus 629: if (*activep)
630: add_local_forward(options, fwd_port, "socks4", 0);
1.72 markus 631: break;
1.17 markus 632:
1.90 stevesk 633: case oClearAllForwardings:
634: intptr = &options->clear_forwardings;
635: goto parse_flag;
636:
1.17 markus 637: case oHost:
638: *activep = 0;
1.42 provos 639: while ((arg = strdelim(&s)) != NULL && *arg != '\0')
1.38 provos 640: if (match_pattern(host, arg)) {
641: debug("Applying options for %.100s", arg);
1.17 markus 642: *activep = 1;
643: break;
644: }
1.42 provos 645: /* Avoid garbage check below, as strdelim is done. */
1.17 markus 646: return 0;
647:
648: case oEscapeChar:
649: intptr = &options->escape_char;
1.42 provos 650: arg = strdelim(&s);
1.40 ho 651: if (!arg || *arg == '\0')
1.17 markus 652: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 653: if (arg[0] == '^' && arg[2] == 0 &&
1.51 markus 654: (u_char) arg[1] >= 64 && (u_char) arg[1] < 128)
655: value = (u_char) arg[1] & 31;
1.38 provos 656: else if (strlen(arg) == 1)
1.51 markus 657: value = (u_char) arg[0];
1.38 provos 658: else if (strcmp(arg, "none") == 0)
1.79 stevesk 659: value = SSH_ESCAPECHAR_NONE;
1.17 markus 660: else {
661: fatal("%.200s line %d: Bad escape character.",
1.91.2.1 jason 662: filename, linenum);
1.17 markus 663: /* NOTREACHED */
664: value = 0; /* Avoid compiler warning. */
665: }
666: if (*activep && *intptr == -1)
667: *intptr = value;
668: break;
669:
1.91.2.2! miod 670: case oDeprecated:
! 671: debug("%s line %d: Deprecated option \"%s\"",
! 672: filename, linenum, keyword);
! 673: return 0;
! 674:
1.17 markus 675: default:
676: fatal("process_config_line: Unimplemented opcode %d", opcode);
677: }
678:
679: /* Check that there is no garbage at end of line. */
1.57 djm 680: if ((arg = strdelim(&s)) != NULL && *arg != '\0') {
1.39 ho 681: fatal("%.200s line %d: garbage at end of line; \"%.200s\".",
1.91.2.1 jason 682: filename, linenum, arg);
1.39 ho 683: }
1.17 markus 684: return 0;
1.1 deraadt 685: }
686:
687:
1.19 markus 688: /*
689: * Reads the config file and modifies the options accordingly. Options
690: * should already be initialized before this call. This never returns if
1.89 stevesk 691: * there is an error. If the file does not exist, this returns 0.
1.19 markus 692: */
1.1 deraadt 693:
1.89 stevesk 694: int
1.17 markus 695: read_config_file(const char *filename, const char *host, Options *options)
1.1 deraadt 696: {
1.17 markus 697: FILE *f;
698: char line[1024];
699: int active, linenum;
700: int bad_options = 0;
701:
702: /* Open the file. */
703: f = fopen(filename, "r");
704: if (!f)
1.89 stevesk 705: return 0;
1.17 markus 706:
707: debug("Reading configuration data %.200s", filename);
708:
1.19 markus 709: /*
710: * Mark that we are now processing the options. This flag is turned
711: * on/off by Host specifications.
712: */
1.17 markus 713: active = 1;
714: linenum = 0;
715: while (fgets(line, sizeof(line), f)) {
716: /* Update line number counter. */
717: linenum++;
718: if (process_config_line(options, host, line, filename, linenum, &active) != 0)
719: bad_options++;
720: }
721: fclose(f);
722: if (bad_options > 0)
1.64 millert 723: fatal("%s: terminating, %d bad configuration options",
1.91.2.1 jason 724: filename, bad_options);
1.89 stevesk 725: return 1;
1.1 deraadt 726: }
727:
1.19 markus 728: /*
729: * Initializes options to special values that indicate that they have not yet
730: * been set. Read_config_file will only set options with this value. Options
731: * are processed in the following order: command line, user config file,
732: * system config file. Last, fill_default_options is called.
733: */
1.1 deraadt 734:
1.26 markus 735: void
1.17 markus 736: initialize_options(Options * options)
1.1 deraadt 737: {
1.17 markus 738: memset(options, 'X', sizeof(*options));
739: options->forward_agent = -1;
740: options->forward_x11 = -1;
1.34 markus 741: options->xauth_location = NULL;
1.17 markus 742: options->gateway_ports = -1;
743: options->use_privileged_port = -1;
744: options->rhosts_authentication = -1;
745: options->rsa_authentication = -1;
1.50 markus 746: options->pubkey_authentication = -1;
1.78 markus 747: options->challenge_response_authentication = -1;
1.82 dugsong 748: #if defined(KRB4) || defined(KRB5)
1.17 markus 749: options->kerberos_authentication = -1;
1.1 deraadt 750: #endif
1.82 dugsong 751: #if defined(AFS) || defined(KRB5)
752: options->kerberos_tgt_passing = -1;
753: #endif
1.5 dugsong 754: #ifdef AFS
1.17 markus 755: options->afs_token_passing = -1;
1.1 deraadt 756: #endif
1.17 markus 757: options->password_authentication = -1;
1.48 markus 758: options->kbd_interactive_authentication = -1;
759: options->kbd_interactive_devices = NULL;
1.17 markus 760: options->rhosts_rsa_authentication = -1;
1.72 markus 761: options->hostbased_authentication = -1;
1.17 markus 762: options->batch_mode = -1;
763: options->check_host_ip = -1;
764: options->strict_host_key_checking = -1;
765: options->compression = -1;
766: options->keepalives = -1;
767: options->compression_level = -1;
768: options->port = -1;
769: options->connection_attempts = -1;
770: options->number_of_password_prompts = -1;
771: options->cipher = -1;
1.25 markus 772: options->ciphers = NULL;
1.62 markus 773: options->macs = NULL;
1.76 markus 774: options->hostkeyalgorithms = NULL;
1.25 markus 775: options->protocol = SSH_PROTO_UNKNOWN;
1.17 markus 776: options->num_identity_files = 0;
777: options->hostname = NULL;
1.52 markus 778: options->host_key_alias = NULL;
1.17 markus 779: options->proxy_command = NULL;
780: options->user = NULL;
781: options->escape_char = -1;
782: options->system_hostfile = NULL;
783: options->user_hostfile = NULL;
1.27 markus 784: options->system_hostfile2 = NULL;
785: options->user_hostfile2 = NULL;
1.17 markus 786: options->num_local_forwards = 0;
787: options->num_remote_forwards = 0;
1.90 stevesk 788: options->clear_forwardings = -1;
1.91.2.1 jason 789: options->log_level = SYSLOG_LEVEL_NOT_SET;
1.67 markus 790: options->preferred_authentications = NULL;
1.77 markus 791: options->bind_address = NULL;
1.86 markus 792: options->smartcard_device = NULL;
1.91 markus 793: options->no_host_authentication_for_localhost = - 1;
1.1 deraadt 794: }
795:
1.19 markus 796: /*
797: * Called after processing other sources of option data, this fills those
798: * options for which no value has been specified with their default values.
799: */
1.1 deraadt 800:
1.26 markus 801: void
1.17 markus 802: fill_default_options(Options * options)
1.1 deraadt 803: {
1.61 deraadt 804: int len;
805:
1.17 markus 806: if (options->forward_agent == -1)
1.33 markus 807: options->forward_agent = 0;
1.17 markus 808: if (options->forward_x11 == -1)
1.23 markus 809: options->forward_x11 = 0;
1.34 markus 810: if (options->xauth_location == NULL)
1.80 markus 811: options->xauth_location = _PATH_XAUTH;
1.17 markus 812: if (options->gateway_ports == -1)
813: options->gateway_ports = 0;
814: if (options->use_privileged_port == -1)
1.65 markus 815: options->use_privileged_port = 0;
1.17 markus 816: if (options->rhosts_authentication == -1)
1.91.2.2! miod 817: options->rhosts_authentication = 0;
1.17 markus 818: if (options->rsa_authentication == -1)
819: options->rsa_authentication = 1;
1.50 markus 820: if (options->pubkey_authentication == -1)
821: options->pubkey_authentication = 1;
1.78 markus 822: if (options->challenge_response_authentication == -1)
1.83 markus 823: options->challenge_response_authentication = 1;
1.82 dugsong 824: #if defined(KRB4) || defined(KRB5)
1.17 markus 825: if (options->kerberos_authentication == -1)
1.45 provos 826: options->kerberos_authentication = 1;
1.82 dugsong 827: #endif
828: #if defined(AFS) || defined(KRB5)
1.17 markus 829: if (options->kerberos_tgt_passing == -1)
830: options->kerberos_tgt_passing = 1;
1.82 dugsong 831: #endif
832: #ifdef AFS
1.17 markus 833: if (options->afs_token_passing == -1)
834: options->afs_token_passing = 1;
1.82 dugsong 835: #endif
1.17 markus 836: if (options->password_authentication == -1)
837: options->password_authentication = 1;
1.48 markus 838: if (options->kbd_interactive_authentication == -1)
1.59 markus 839: options->kbd_interactive_authentication = 1;
1.17 markus 840: if (options->rhosts_rsa_authentication == -1)
1.91.2.2! miod 841: options->rhosts_rsa_authentication = 0;
1.72 markus 842: if (options->hostbased_authentication == -1)
843: options->hostbased_authentication = 0;
1.17 markus 844: if (options->batch_mode == -1)
845: options->batch_mode = 0;
846: if (options->check_host_ip == -1)
847: options->check_host_ip = 1;
848: if (options->strict_host_key_checking == -1)
849: options->strict_host_key_checking = 2; /* 2 is default */
850: if (options->compression == -1)
851: options->compression = 0;
852: if (options->keepalives == -1)
853: options->keepalives = 1;
854: if (options->compression_level == -1)
855: options->compression_level = 6;
856: if (options->port == -1)
857: options->port = 0; /* Filled in ssh_connect. */
858: if (options->connection_attempts == -1)
1.84 markus 859: options->connection_attempts = 1;
1.17 markus 860: if (options->number_of_password_prompts == -1)
861: options->number_of_password_prompts = 3;
862: /* Selected in ssh_login(). */
863: if (options->cipher == -1)
864: options->cipher = SSH_CIPHER_NOT_SET;
1.31 markus 865: /* options->ciphers, default set in myproposals.h */
1.62 markus 866: /* options->macs, default set in myproposals.h */
1.76 markus 867: /* options->hostkeyalgorithms, default set in myproposals.h */
1.25 markus 868: if (options->protocol == SSH_PROTO_UNKNOWN)
1.69 markus 869: options->protocol = SSH_PROTO_1|SSH_PROTO_2;
1.17 markus 870: if (options->num_identity_files == 0) {
1.50 markus 871: if (options->protocol & SSH_PROTO_1) {
1.61 deraadt 872: len = 2 + strlen(_PATH_SSH_CLIENT_IDENTITY) + 1;
1.50 markus 873: options->identity_files[options->num_identity_files] =
1.61 deraadt 874: xmalloc(len);
875: snprintf(options->identity_files[options->num_identity_files++],
876: len, "~/%.100s", _PATH_SSH_CLIENT_IDENTITY);
1.50 markus 877: }
878: if (options->protocol & SSH_PROTO_2) {
1.63 deraadt 879: len = 2 + strlen(_PATH_SSH_CLIENT_ID_RSA) + 1;
880: options->identity_files[options->num_identity_files] =
881: xmalloc(len);
882: snprintf(options->identity_files[options->num_identity_files++],
883: len, "~/%.100s", _PATH_SSH_CLIENT_ID_RSA);
884:
1.61 deraadt 885: len = 2 + strlen(_PATH_SSH_CLIENT_ID_DSA) + 1;
1.50 markus 886: options->identity_files[options->num_identity_files] =
1.61 deraadt 887: xmalloc(len);
888: snprintf(options->identity_files[options->num_identity_files++],
889: len, "~/%.100s", _PATH_SSH_CLIENT_ID_DSA);
1.50 markus 890: }
1.27 markus 891: }
1.17 markus 892: if (options->escape_char == -1)
893: options->escape_char = '~';
894: if (options->system_hostfile == NULL)
1.55 markus 895: options->system_hostfile = _PATH_SSH_SYSTEM_HOSTFILE;
1.17 markus 896: if (options->user_hostfile == NULL)
1.55 markus 897: options->user_hostfile = _PATH_SSH_USER_HOSTFILE;
1.27 markus 898: if (options->system_hostfile2 == NULL)
1.55 markus 899: options->system_hostfile2 = _PATH_SSH_SYSTEM_HOSTFILE2;
1.27 markus 900: if (options->user_hostfile2 == NULL)
1.55 markus 901: options->user_hostfile2 = _PATH_SSH_USER_HOSTFILE2;
1.91.2.1 jason 902: if (options->log_level == SYSLOG_LEVEL_NOT_SET)
1.54 markus 903: options->log_level = SYSLOG_LEVEL_INFO;
1.90 stevesk 904: if (options->clear_forwardings == 1)
905: clear_forwardings(options);
1.91 markus 906: if (options->no_host_authentication_for_localhost == - 1)
907: options->no_host_authentication_for_localhost = 0;
1.17 markus 908: /* options->proxy_command should not be set by default */
909: /* options->user will be set in the main program if appropriate */
910: /* options->hostname will be set in the main program if appropriate */
1.52 markus 911: /* options->host_key_alias should not be set by default */
1.67 markus 912: /* options->preferred_authentications will be set in ssh */
1.1 deraadt 913: }
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