Annotation of src/usr.bin/ssh/readconf.c, Revision 1.92
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"
1.92 ! stevesk 15: RCSID("$OpenBSD: readconf.c,v 1.91 2001/10/01 21:51:16 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
44: FallBackToRsh no
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
68: UseRsh yes
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: FallBackToRsh no
83: UseRsh no
84: StrictHostKeyChecking yes
85: KeepAlives no
86: IdentityFile ~/.ssh/identity
87: Port 22
88: EscapeChar ~
89:
90: */
91:
92: /* Keyword tokens. */
93:
1.17 markus 94: typedef enum {
95: oBadOption,
96: oForwardAgent, oForwardX11, oGatewayPorts, oRhostsAuthentication,
97: oPasswordAuthentication, oRSAAuthentication, oFallBackToRsh, oUseRsh,
1.59 markus 98: oChallengeResponseAuthentication, oXAuthLocation,
1.82 dugsong 99: #if defined(KRB4) || defined(KRB5)
1.17 markus 100: oKerberosAuthentication,
1.82 dugsong 101: #endif
102: #if defined(AFS) || defined(KRB5)
103: oKerberosTgtPassing,
104: #endif
1.1 deraadt 105: #ifdef AFS
1.82 dugsong 106: oAFSTokenPassing,
1.1 deraadt 107: #endif
1.17 markus 108: oIdentityFile, oHostName, oPort, oCipher, oRemoteForward, oLocalForward,
109: oUser, oHost, oEscapeChar, oRhostsRSAAuthentication, oProxyCommand,
110: oGlobalKnownHostsFile, oUserKnownHostsFile, oConnectionAttempts,
111: oBatchMode, oCheckHostIP, oStrictHostKeyChecking, oCompression,
1.59 markus 112: oCompressionLevel, oKeepAlives, oNumberOfPasswordPrompts,
1.62 markus 113: oUsePrivilegedPort, oLogLevel, oCiphers, oProtocol, oMacs,
1.50 markus 114: oGlobalKnownHostsFile2, oUserKnownHostsFile2, oPubkeyAuthentication,
1.67 markus 115: oKbdInteractiveAuthentication, oKbdInteractiveDevices, oHostKeyAlias,
1.76 markus 116: oDynamicForward, oPreferredAuthentications, oHostbasedAuthentication,
1.90 stevesk 117: oHostKeyAlgorithms, oBindAddress, oSmartcardDevice,
1.91 markus 118: oClearAllForwardings, oNoHostAuthenticationForLocalhost
1.1 deraadt 119: } OpCodes;
120:
121: /* Textual representations of the tokens. */
122:
1.17 markus 123: static struct {
124: const char *name;
125: OpCodes opcode;
126: } keywords[] = {
127: { "forwardagent", oForwardAgent },
128: { "forwardx11", oForwardX11 },
1.34 markus 129: { "xauthlocation", oXAuthLocation },
1.17 markus 130: { "gatewayports", oGatewayPorts },
131: { "useprivilegedport", oUsePrivilegedPort },
132: { "rhostsauthentication", oRhostsAuthentication },
133: { "passwordauthentication", oPasswordAuthentication },
1.48 markus 134: { "kbdinteractiveauthentication", oKbdInteractiveAuthentication },
135: { "kbdinteractivedevices", oKbdInteractiveDevices },
1.17 markus 136: { "rsaauthentication", oRSAAuthentication },
1.50 markus 137: { "pubkeyauthentication", oPubkeyAuthentication },
1.59 markus 138: { "dsaauthentication", oPubkeyAuthentication }, /* alias */
1.72 markus 139: { "rhostsrsaauthentication", oRhostsRSAAuthentication },
1.73 markus 140: { "hostbasedauthentication", oHostbasedAuthentication },
1.59 markus 141: { "challengeresponseauthentication", oChallengeResponseAuthentication },
142: { "skeyauthentication", oChallengeResponseAuthentication }, /* alias */
143: { "tisauthentication", oChallengeResponseAuthentication }, /* alias */
1.82 dugsong 144: #if defined(KRB4) || defined(KRB5)
1.17 markus 145: { "kerberosauthentication", oKerberosAuthentication },
1.82 dugsong 146: #endif
147: #if defined(AFS) || defined(KRB5)
148: { "kerberostgtpassing", oKerberosTgtPassing },
149: #endif
1.5 dugsong 150: #ifdef AFS
1.17 markus 151: { "afstokenpassing", oAFSTokenPassing },
1.1 deraadt 152: #endif
1.17 markus 153: { "fallbacktorsh", oFallBackToRsh },
154: { "usersh", oUseRsh },
155: { "identityfile", oIdentityFile },
1.50 markus 156: { "identityfile2", oIdentityFile }, /* alias */
1.17 markus 157: { "hostname", oHostName },
1.52 markus 158: { "hostkeyalias", oHostKeyAlias },
1.17 markus 159: { "proxycommand", oProxyCommand },
160: { "port", oPort },
161: { "cipher", oCipher },
1.25 markus 162: { "ciphers", oCiphers },
1.62 markus 163: { "macs", oMacs },
1.25 markus 164: { "protocol", oProtocol },
1.17 markus 165: { "remoteforward", oRemoteForward },
166: { "localforward", oLocalForward },
167: { "user", oUser },
168: { "host", oHost },
169: { "escapechar", oEscapeChar },
170: { "globalknownhostsfile", oGlobalKnownHostsFile },
1.81 markus 171: { "userknownhostsfile", oUserKnownHostsFile }, /* obsolete */
1.27 markus 172: { "globalknownhostsfile2", oGlobalKnownHostsFile2 },
1.81 markus 173: { "userknownhostsfile2", oUserKnownHostsFile2 }, /* obsolete */
1.17 markus 174: { "connectionattempts", oConnectionAttempts },
175: { "batchmode", oBatchMode },
176: { "checkhostip", oCheckHostIP },
177: { "stricthostkeychecking", oStrictHostKeyChecking },
178: { "compression", oCompression },
179: { "compressionlevel", oCompressionLevel },
180: { "keepalive", oKeepAlives },
181: { "numberofpasswordprompts", oNumberOfPasswordPrompts },
182: { "loglevel", oLogLevel },
1.71 markus 183: { "dynamicforward", oDynamicForward },
1.67 markus 184: { "preferredauthentications", oPreferredAuthentications },
1.76 markus 185: { "hostkeyalgorithms", oHostKeyAlgorithms },
1.77 markus 186: { "bindaddress", oBindAddress },
1.85 jakob 187: { "smartcarddevice", oSmartcardDevice },
1.90 stevesk 188: { "clearallforwardings", oClearAllForwardings },
1.91 markus 189: { "nohostauthenticationforlocalhost", oNoHostAuthenticationForLocalhost },
1.92 ! stevesk 190: { NULL, oBadOption }
1.13 markus 191: };
192:
1.19 markus 193: /*
194: * Adds a local TCP/IP port forward to options. Never returns if there is an
195: * error.
196: */
1.1 deraadt 197:
1.26 markus 198: void
1.22 markus 199: add_local_forward(Options *options, u_short port, const char *host,
200: u_short host_port)
1.1 deraadt 201: {
1.17 markus 202: Forward *fwd;
203: extern uid_t original_real_uid;
204: if (port < IPPORT_RESERVED && original_real_uid != 0)
1.64 millert 205: fatal("Privileged ports can only be forwarded by root.");
1.17 markus 206: if (options->num_local_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
207: fatal("Too many local forwards (max %d).", SSH_MAX_FORWARDS_PER_DIRECTION);
208: fwd = &options->local_forwards[options->num_local_forwards++];
209: fwd->port = port;
210: fwd->host = xstrdup(host);
211: fwd->host_port = host_port;
1.1 deraadt 212: }
213:
1.19 markus 214: /*
215: * Adds a remote TCP/IP port forward to options. Never returns if there is
216: * an error.
217: */
1.1 deraadt 218:
1.26 markus 219: void
1.22 markus 220: add_remote_forward(Options *options, u_short port, const char *host,
221: u_short host_port)
1.1 deraadt 222: {
1.17 markus 223: Forward *fwd;
224: if (options->num_remote_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
225: fatal("Too many remote forwards (max %d).",
226: SSH_MAX_FORWARDS_PER_DIRECTION);
227: fwd = &options->remote_forwards[options->num_remote_forwards++];
228: fwd->port = port;
229: fwd->host = xstrdup(host);
230: fwd->host_port = host_port;
1.1 deraadt 231: }
232:
1.90 stevesk 233: static void
234: clear_forwardings(Options *options)
235: {
236: int i;
237:
238: for (i = 0; i < options->num_local_forwards; i++)
239: xfree(options->local_forwards[i].host);
240: options->num_local_forwards = 0;
241: for (i = 0; i < options->num_remote_forwards; i++)
242: xfree(options->remote_forwards[i].host);
243: options->num_remote_forwards = 0;
244: }
245:
1.19 markus 246: /*
1.70 stevesk 247: * Returns the number of the token pointed to by cp or oBadOption.
1.19 markus 248: */
1.1 deraadt 249:
1.26 markus 250: static OpCodes
1.17 markus 251: parse_token(const char *cp, const char *filename, int linenum)
1.1 deraadt 252: {
1.51 markus 253: u_int i;
1.1 deraadt 254:
1.17 markus 255: for (i = 0; keywords[i].name; i++)
1.20 markus 256: if (strcasecmp(cp, keywords[i].name) == 0)
1.17 markus 257: return keywords[i].opcode;
258:
1.75 stevesk 259: error("%s: line %d: Bad configuration option: %s",
260: filename, linenum, cp);
1.17 markus 261: return oBadOption;
1.1 deraadt 262: }
263:
1.19 markus 264: /*
265: * Processes a single option line as used in the configuration files. This
266: * only sets those values that have not already been set.
267: */
1.1 deraadt 268:
1.14 markus 269: int
270: process_config_line(Options *options, const char *host,
1.17 markus 271: char *line, const char *filename, int linenum,
272: int *activep)
1.1 deraadt 273: {
1.38 provos 274: char buf[256], *s, *string, **charptr, *endofnumber, *keyword, *arg;
1.22 markus 275: int opcode, *intptr, value;
276: u_short fwd_port, fwd_host_port;
1.88 stevesk 277: char sfwd_host_port[6];
1.1 deraadt 278:
1.42 provos 279: s = line;
280: /* Get the keyword. (Each line is supposed to begin with a keyword). */
281: keyword = strdelim(&s);
282: /* Ignore leading whitespace. */
283: if (*keyword == '\0')
1.43 markus 284: keyword = strdelim(&s);
1.56 deraadt 285: if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#')
1.17 markus 286: return 0;
287:
1.38 provos 288: opcode = parse_token(keyword, filename, linenum);
1.17 markus 289:
290: switch (opcode) {
291: case oBadOption:
1.19 markus 292: /* don't panic, but count bad options */
293: return -1;
1.17 markus 294: /* NOTREACHED */
295: case oForwardAgent:
296: intptr = &options->forward_agent;
297: parse_flag:
1.42 provos 298: arg = strdelim(&s);
1.40 ho 299: if (!arg || *arg == '\0')
1.17 markus 300: fatal("%.200s line %d: Missing yes/no argument.", filename, linenum);
301: value = 0; /* To avoid compiler warning... */
1.38 provos 302: if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
1.17 markus 303: value = 1;
1.38 provos 304: else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
1.17 markus 305: value = 0;
306: else
307: fatal("%.200s line %d: Bad yes/no argument.", filename, linenum);
308: if (*activep && *intptr == -1)
309: *intptr = value;
310: break;
311:
312: case oForwardX11:
313: intptr = &options->forward_x11;
314: goto parse_flag;
315:
316: case oGatewayPorts:
317: intptr = &options->gateway_ports;
318: goto parse_flag;
319:
320: case oUsePrivilegedPort:
321: intptr = &options->use_privileged_port;
322: goto parse_flag;
323:
324: case oRhostsAuthentication:
325: intptr = &options->rhosts_authentication;
326: goto parse_flag;
327:
328: case oPasswordAuthentication:
329: intptr = &options->password_authentication;
330: goto parse_flag;
331:
1.48 markus 332: case oKbdInteractiveAuthentication:
333: intptr = &options->kbd_interactive_authentication;
334: goto parse_flag;
335:
336: case oKbdInteractiveDevices:
337: charptr = &options->kbd_interactive_devices;
338: goto parse_string;
339:
1.50 markus 340: case oPubkeyAuthentication:
341: intptr = &options->pubkey_authentication;
1.30 markus 342: goto parse_flag;
343:
1.17 markus 344: case oRSAAuthentication:
345: intptr = &options->rsa_authentication;
346: goto parse_flag;
347:
348: case oRhostsRSAAuthentication:
349: intptr = &options->rhosts_rsa_authentication;
350: goto parse_flag;
351:
1.72 markus 352: case oHostbasedAuthentication:
353: intptr = &options->hostbased_authentication;
354: goto parse_flag;
355:
1.59 markus 356: case oChallengeResponseAuthentication:
1.78 markus 357: intptr = &options->challenge_response_authentication;
1.17 markus 358: goto parse_flag;
1.82 dugsong 359: #if defined(KRB4) || defined(KRB5)
1.17 markus 360: case oKerberosAuthentication:
361: intptr = &options->kerberos_authentication;
362: goto parse_flag;
1.82 dugsong 363: #endif
364: #if defined(AFS) || defined(KRB5)
1.17 markus 365: case oKerberosTgtPassing:
366: intptr = &options->kerberos_tgt_passing;
367: goto parse_flag;
1.82 dugsong 368: #endif
369: #ifdef AFS
1.17 markus 370: case oAFSTokenPassing:
371: intptr = &options->afs_token_passing;
372: goto parse_flag;
1.1 deraadt 373: #endif
1.17 markus 374: case oFallBackToRsh:
375: intptr = &options->fallback_to_rsh;
376: goto parse_flag;
377:
378: case oUseRsh:
379: intptr = &options->use_rsh;
380: goto parse_flag;
381:
382: case oBatchMode:
383: intptr = &options->batch_mode;
384: goto parse_flag;
385:
386: case oCheckHostIP:
387: intptr = &options->check_host_ip;
388: goto parse_flag;
389:
390: case oStrictHostKeyChecking:
391: intptr = &options->strict_host_key_checking;
1.42 provos 392: arg = strdelim(&s);
1.40 ho 393: if (!arg || *arg == '\0')
1.60 stevesk 394: fatal("%.200s line %d: Missing yes/no/ask argument.",
1.17 markus 395: filename, linenum);
396: value = 0; /* To avoid compiler warning... */
1.38 provos 397: if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
1.17 markus 398: value = 1;
1.38 provos 399: else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
1.17 markus 400: value = 0;
1.38 provos 401: else if (strcmp(arg, "ask") == 0)
1.17 markus 402: value = 2;
403: else
404: fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum);
405: if (*activep && *intptr == -1)
406: *intptr = value;
407: break;
408:
409: case oCompression:
410: intptr = &options->compression;
411: goto parse_flag;
412:
413: case oKeepAlives:
414: intptr = &options->keepalives;
415: goto parse_flag;
416:
1.91 markus 417: case oNoHostAuthenticationForLocalhost:
418: intptr = &options->no_host_authentication_for_localhost;
419: goto parse_flag;
420:
1.17 markus 421: case oNumberOfPasswordPrompts:
422: intptr = &options->number_of_password_prompts;
423: goto parse_int;
424:
425: case oCompressionLevel:
426: intptr = &options->compression_level;
427: goto parse_int;
428:
429: case oIdentityFile:
1.42 provos 430: arg = strdelim(&s);
1.40 ho 431: if (!arg || *arg == '\0')
1.17 markus 432: fatal("%.200s line %d: Missing argument.", filename, linenum);
433: if (*activep) {
1.50 markus 434: intptr = &options->num_identity_files;
1.27 markus 435: if (*intptr >= SSH_MAX_IDENTITY_FILES)
1.17 markus 436: fatal("%.200s line %d: Too many identity files specified (max %d).",
437: filename, linenum, SSH_MAX_IDENTITY_FILES);
1.50 markus 438: charptr = &options->identity_files[*intptr];
1.38 provos 439: *charptr = xstrdup(arg);
1.27 markus 440: *intptr = *intptr + 1;
1.17 markus 441: }
442: break;
443:
1.34 markus 444: case oXAuthLocation:
445: charptr=&options->xauth_location;
446: goto parse_string;
447:
1.17 markus 448: case oUser:
449: charptr = &options->user;
450: parse_string:
1.42 provos 451: arg = strdelim(&s);
1.40 ho 452: if (!arg || *arg == '\0')
1.17 markus 453: fatal("%.200s line %d: Missing argument.", filename, linenum);
454: if (*activep && *charptr == NULL)
1.38 provos 455: *charptr = xstrdup(arg);
1.17 markus 456: break;
457:
458: case oGlobalKnownHostsFile:
459: charptr = &options->system_hostfile;
460: goto parse_string;
461:
462: case oUserKnownHostsFile:
463: charptr = &options->user_hostfile;
464: goto parse_string;
465:
1.27 markus 466: case oGlobalKnownHostsFile2:
467: charptr = &options->system_hostfile2;
468: goto parse_string;
469:
470: case oUserKnownHostsFile2:
471: charptr = &options->user_hostfile2;
472: goto parse_string;
473:
1.17 markus 474: case oHostName:
475: charptr = &options->hostname;
476: goto parse_string;
477:
1.52 markus 478: case oHostKeyAlias:
479: charptr = &options->host_key_alias;
480: goto parse_string;
481:
1.67 markus 482: case oPreferredAuthentications:
483: charptr = &options->preferred_authentications;
484: goto parse_string;
485:
1.77 markus 486: case oBindAddress:
487: charptr = &options->bind_address;
488: goto parse_string;
489:
1.85 jakob 490: case oSmartcardDevice:
1.86 markus 491: charptr = &options->smartcard_device;
492: goto parse_string;
1.85 jakob 493:
1.17 markus 494: case oProxyCommand:
495: charptr = &options->proxy_command;
496: string = xstrdup("");
1.42 provos 497: while ((arg = strdelim(&s)) != NULL && *arg != '\0') {
1.38 provos 498: string = xrealloc(string, strlen(string) + strlen(arg) + 2);
1.17 markus 499: strcat(string, " ");
1.38 provos 500: strcat(string, arg);
1.17 markus 501: }
502: if (*activep && *charptr == NULL)
503: *charptr = string;
504: else
505: xfree(string);
506: return 0;
507:
508: case oPort:
509: intptr = &options->port;
510: parse_int:
1.42 provos 511: arg = strdelim(&s);
1.40 ho 512: if (!arg || *arg == '\0')
1.17 markus 513: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 514: if (arg[0] < '0' || arg[0] > '9')
1.17 markus 515: fatal("%.200s line %d: Bad number.", filename, linenum);
1.21 markus 516:
517: /* Octal, decimal, or hex format? */
1.38 provos 518: value = strtol(arg, &endofnumber, 0);
519: if (arg == endofnumber)
1.21 markus 520: fatal("%.200s line %d: Bad number.", filename, linenum);
1.17 markus 521: if (*activep && *intptr == -1)
522: *intptr = value;
523: break;
524:
525: case oConnectionAttempts:
526: intptr = &options->connection_attempts;
527: goto parse_int;
528:
529: case oCipher:
530: intptr = &options->cipher;
1.42 provos 531: arg = strdelim(&s);
1.40 ho 532: if (!arg || *arg == '\0')
1.32 markus 533: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 534: value = cipher_number(arg);
1.17 markus 535: if (value == -1)
536: fatal("%.200s line %d: Bad cipher '%s'.",
1.38 provos 537: filename, linenum, arg ? arg : "<NONE>");
1.17 markus 538: if (*activep && *intptr == -1)
539: *intptr = value;
540: break;
541:
1.25 markus 542: case oCiphers:
1.42 provos 543: arg = strdelim(&s);
1.40 ho 544: if (!arg || *arg == '\0')
1.32 markus 545: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 546: if (!ciphers_valid(arg))
1.31 markus 547: fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.",
1.38 provos 548: filename, linenum, arg ? arg : "<NONE>");
1.25 markus 549: if (*activep && options->ciphers == NULL)
1.38 provos 550: options->ciphers = xstrdup(arg);
1.25 markus 551: break;
552:
1.62 markus 553: case oMacs:
554: arg = strdelim(&s);
555: if (!arg || *arg == '\0')
556: fatal("%.200s line %d: Missing argument.", filename, linenum);
557: if (!mac_valid(arg))
558: fatal("%.200s line %d: Bad SSH2 Mac spec '%s'.",
559: filename, linenum, arg ? arg : "<NONE>");
560: if (*activep && options->macs == NULL)
561: options->macs = xstrdup(arg);
562: break;
563:
1.76 markus 564: case oHostKeyAlgorithms:
565: arg = strdelim(&s);
566: if (!arg || *arg == '\0')
567: fatal("%.200s line %d: Missing argument.", filename, linenum);
568: if (!key_names_valid2(arg))
569: fatal("%.200s line %d: Bad protocol 2 host key algorithms '%s'.",
570: filename, linenum, arg ? arg : "<NONE>");
571: if (*activep && options->hostkeyalgorithms == NULL)
572: options->hostkeyalgorithms = xstrdup(arg);
573: break;
574:
1.25 markus 575: case oProtocol:
576: intptr = &options->protocol;
1.42 provos 577: arg = strdelim(&s);
1.40 ho 578: if (!arg || *arg == '\0')
1.32 markus 579: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 580: value = proto_spec(arg);
1.25 markus 581: if (value == SSH_PROTO_UNKNOWN)
582: fatal("%.200s line %d: Bad protocol spec '%s'.",
1.38 provos 583: filename, linenum, arg ? arg : "<NONE>");
1.25 markus 584: if (*activep && *intptr == SSH_PROTO_UNKNOWN)
585: *intptr = value;
586: break;
587:
1.17 markus 588: case oLogLevel:
589: intptr = (int *) &options->log_level;
1.42 provos 590: arg = strdelim(&s);
1.38 provos 591: value = log_level_number(arg);
1.17 markus 592: if (value == (LogLevel) - 1)
1.64 millert 593: fatal("%.200s line %d: unsupported log level '%s'",
1.38 provos 594: filename, linenum, arg ? arg : "<NONE>");
1.17 markus 595: if (*activep && (LogLevel) * intptr == -1)
596: *intptr = (LogLevel) value;
597: break;
598:
1.88 stevesk 599: case oLocalForward:
1.17 markus 600: case oRemoteForward:
1.42 provos 601: arg = strdelim(&s);
1.40 ho 602: if (!arg || *arg == '\0')
1.88 stevesk 603: fatal("%.200s line %d: Missing port argument.",
604: filename, linenum);
605: if ((fwd_port = a2port(arg)) == 0)
606: fatal("%.200s line %d: Bad listen port.",
607: filename, linenum);
1.42 provos 608: arg = strdelim(&s);
1.40 ho 609: if (!arg || *arg == '\0')
1.17 markus 610: fatal("%.200s line %d: Missing second argument.",
1.88 stevesk 611: filename, linenum);
612: if (sscanf(arg, "%255[^:]:%5[0-9]", buf, sfwd_host_port) != 2 &&
613: sscanf(arg, "%255[^/]/%5[0-9]", buf, sfwd_host_port) != 2)
614: fatal("%.200s line %d: Bad forwarding specification.",
615: filename, linenum);
616: if ((fwd_host_port = a2port(sfwd_host_port)) == 0)
617: fatal("%.200s line %d: Bad forwarding port.",
618: filename, linenum);
619: if (*activep) {
620: if (opcode == oLocalForward)
621: add_local_forward(options, fwd_port, buf,
622: fwd_host_port);
623: else if (opcode == oRemoteForward)
624: add_remote_forward(options, fwd_port, buf,
625: fwd_host_port);
626: }
1.17 markus 627: break;
1.71 markus 628:
629: case oDynamicForward:
630: arg = strdelim(&s);
631: if (!arg || *arg == '\0')
632: fatal("%.200s line %d: Missing port argument.",
633: filename, linenum);
1.74 stevesk 634: fwd_port = a2port(arg);
635: if (fwd_port == 0)
1.71 markus 636: fatal("%.200s line %d: Badly formatted port number.",
637: filename, linenum);
1.87 markus 638: if (*activep)
639: add_local_forward(options, fwd_port, "socks4", 0);
1.72 markus 640: break;
1.17 markus 641:
1.90 stevesk 642: case oClearAllForwardings:
643: intptr = &options->clear_forwardings;
644: goto parse_flag;
645:
1.17 markus 646: case oHost:
647: *activep = 0;
1.42 provos 648: while ((arg = strdelim(&s)) != NULL && *arg != '\0')
1.38 provos 649: if (match_pattern(host, arg)) {
650: debug("Applying options for %.100s", arg);
1.17 markus 651: *activep = 1;
652: break;
653: }
1.42 provos 654: /* Avoid garbage check below, as strdelim is done. */
1.17 markus 655: return 0;
656:
657: case oEscapeChar:
658: intptr = &options->escape_char;
1.42 provos 659: arg = strdelim(&s);
1.40 ho 660: if (!arg || *arg == '\0')
1.17 markus 661: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 662: if (arg[0] == '^' && arg[2] == 0 &&
1.51 markus 663: (u_char) arg[1] >= 64 && (u_char) arg[1] < 128)
664: value = (u_char) arg[1] & 31;
1.38 provos 665: else if (strlen(arg) == 1)
1.51 markus 666: value = (u_char) arg[0];
1.38 provos 667: else if (strcmp(arg, "none") == 0)
1.79 stevesk 668: value = SSH_ESCAPECHAR_NONE;
1.17 markus 669: else {
670: fatal("%.200s line %d: Bad escape character.",
671: filename, linenum);
672: /* NOTREACHED */
673: value = 0; /* Avoid compiler warning. */
674: }
675: if (*activep && *intptr == -1)
676: *intptr = value;
677: break;
678:
679: default:
680: fatal("process_config_line: Unimplemented opcode %d", opcode);
681: }
682:
683: /* Check that there is no garbage at end of line. */
1.57 djm 684: if ((arg = strdelim(&s)) != NULL && *arg != '\0') {
1.39 ho 685: fatal("%.200s line %d: garbage at end of line; \"%.200s\".",
686: filename, linenum, arg);
687: }
1.17 markus 688: return 0;
1.1 deraadt 689: }
690:
691:
1.19 markus 692: /*
693: * Reads the config file and modifies the options accordingly. Options
694: * should already be initialized before this call. This never returns if
1.89 stevesk 695: * there is an error. If the file does not exist, this returns 0.
1.19 markus 696: */
1.1 deraadt 697:
1.89 stevesk 698: int
1.17 markus 699: read_config_file(const char *filename, const char *host, Options *options)
1.1 deraadt 700: {
1.17 markus 701: FILE *f;
702: char line[1024];
703: int active, linenum;
704: int bad_options = 0;
705:
706: /* Open the file. */
707: f = fopen(filename, "r");
708: if (!f)
1.89 stevesk 709: return 0;
1.17 markus 710:
711: debug("Reading configuration data %.200s", filename);
712:
1.19 markus 713: /*
714: * Mark that we are now processing the options. This flag is turned
715: * on/off by Host specifications.
716: */
1.17 markus 717: active = 1;
718: linenum = 0;
719: while (fgets(line, sizeof(line), f)) {
720: /* Update line number counter. */
721: linenum++;
722: if (process_config_line(options, host, line, filename, linenum, &active) != 0)
723: bad_options++;
724: }
725: fclose(f);
726: if (bad_options > 0)
1.64 millert 727: fatal("%s: terminating, %d bad configuration options",
1.17 markus 728: filename, bad_options);
1.89 stevesk 729: return 1;
1.1 deraadt 730: }
731:
1.19 markus 732: /*
733: * Initializes options to special values that indicate that they have not yet
734: * been set. Read_config_file will only set options with this value. Options
735: * are processed in the following order: command line, user config file,
736: * system config file. Last, fill_default_options is called.
737: */
1.1 deraadt 738:
1.26 markus 739: void
1.17 markus 740: initialize_options(Options * options)
1.1 deraadt 741: {
1.17 markus 742: memset(options, 'X', sizeof(*options));
743: options->forward_agent = -1;
744: options->forward_x11 = -1;
1.34 markus 745: options->xauth_location = NULL;
1.17 markus 746: options->gateway_ports = -1;
747: options->use_privileged_port = -1;
748: options->rhosts_authentication = -1;
749: options->rsa_authentication = -1;
1.50 markus 750: options->pubkey_authentication = -1;
1.78 markus 751: options->challenge_response_authentication = -1;
1.82 dugsong 752: #if defined(KRB4) || defined(KRB5)
1.17 markus 753: options->kerberos_authentication = -1;
1.1 deraadt 754: #endif
1.82 dugsong 755: #if defined(AFS) || defined(KRB5)
756: options->kerberos_tgt_passing = -1;
757: #endif
1.5 dugsong 758: #ifdef AFS
1.17 markus 759: options->afs_token_passing = -1;
1.1 deraadt 760: #endif
1.17 markus 761: options->password_authentication = -1;
1.48 markus 762: options->kbd_interactive_authentication = -1;
763: options->kbd_interactive_devices = NULL;
1.17 markus 764: options->rhosts_rsa_authentication = -1;
1.72 markus 765: options->hostbased_authentication = -1;
1.17 markus 766: options->fallback_to_rsh = -1;
767: options->use_rsh = -1;
768: options->batch_mode = -1;
769: options->check_host_ip = -1;
770: options->strict_host_key_checking = -1;
771: options->compression = -1;
772: options->keepalives = -1;
773: options->compression_level = -1;
774: options->port = -1;
775: options->connection_attempts = -1;
776: options->number_of_password_prompts = -1;
777: options->cipher = -1;
1.25 markus 778: options->ciphers = NULL;
1.62 markus 779: options->macs = NULL;
1.76 markus 780: options->hostkeyalgorithms = NULL;
1.25 markus 781: options->protocol = SSH_PROTO_UNKNOWN;
1.17 markus 782: options->num_identity_files = 0;
783: options->hostname = NULL;
1.52 markus 784: options->host_key_alias = NULL;
1.17 markus 785: options->proxy_command = NULL;
786: options->user = NULL;
787: options->escape_char = -1;
788: options->system_hostfile = NULL;
789: options->user_hostfile = NULL;
1.27 markus 790: options->system_hostfile2 = NULL;
791: options->user_hostfile2 = NULL;
1.17 markus 792: options->num_local_forwards = 0;
793: options->num_remote_forwards = 0;
1.90 stevesk 794: options->clear_forwardings = -1;
1.17 markus 795: options->log_level = (LogLevel) - 1;
1.67 markus 796: options->preferred_authentications = NULL;
1.77 markus 797: options->bind_address = NULL;
1.86 markus 798: options->smartcard_device = NULL;
1.91 markus 799: options->no_host_authentication_for_localhost = - 1;
1.1 deraadt 800: }
801:
1.19 markus 802: /*
803: * Called after processing other sources of option data, this fills those
804: * options for which no value has been specified with their default values.
805: */
1.1 deraadt 806:
1.26 markus 807: void
1.17 markus 808: fill_default_options(Options * options)
1.1 deraadt 809: {
1.61 deraadt 810: int len;
811:
1.17 markus 812: if (options->forward_agent == -1)
1.33 markus 813: options->forward_agent = 0;
1.17 markus 814: if (options->forward_x11 == -1)
1.23 markus 815: options->forward_x11 = 0;
1.80 markus 816: #ifdef _PATH_XAUTH
1.34 markus 817: if (options->xauth_location == NULL)
1.80 markus 818: options->xauth_location = _PATH_XAUTH;
819: #endif
1.17 markus 820: if (options->gateway_ports == -1)
821: options->gateway_ports = 0;
822: if (options->use_privileged_port == -1)
1.65 markus 823: options->use_privileged_port = 0;
1.17 markus 824: if (options->rhosts_authentication == -1)
825: options->rhosts_authentication = 1;
826: if (options->rsa_authentication == -1)
827: options->rsa_authentication = 1;
1.50 markus 828: if (options->pubkey_authentication == -1)
829: options->pubkey_authentication = 1;
1.78 markus 830: if (options->challenge_response_authentication == -1)
1.83 markus 831: options->challenge_response_authentication = 1;
1.82 dugsong 832: #if defined(KRB4) || defined(KRB5)
1.17 markus 833: if (options->kerberos_authentication == -1)
1.45 provos 834: options->kerberos_authentication = 1;
1.82 dugsong 835: #endif
836: #if defined(AFS) || defined(KRB5)
1.17 markus 837: if (options->kerberos_tgt_passing == -1)
838: options->kerberos_tgt_passing = 1;
1.82 dugsong 839: #endif
840: #ifdef AFS
1.17 markus 841: if (options->afs_token_passing == -1)
842: options->afs_token_passing = 1;
1.82 dugsong 843: #endif
1.17 markus 844: if (options->password_authentication == -1)
845: options->password_authentication = 1;
1.48 markus 846: if (options->kbd_interactive_authentication == -1)
1.59 markus 847: options->kbd_interactive_authentication = 1;
1.17 markus 848: if (options->rhosts_rsa_authentication == -1)
849: options->rhosts_rsa_authentication = 1;
1.72 markus 850: if (options->hostbased_authentication == -1)
851: options->hostbased_authentication = 0;
1.17 markus 852: if (options->fallback_to_rsh == -1)
1.41 deraadt 853: options->fallback_to_rsh = 0;
1.17 markus 854: if (options->use_rsh == -1)
855: options->use_rsh = 0;
856: if (options->batch_mode == -1)
857: options->batch_mode = 0;
858: if (options->check_host_ip == -1)
859: options->check_host_ip = 1;
860: if (options->strict_host_key_checking == -1)
861: options->strict_host_key_checking = 2; /* 2 is default */
862: if (options->compression == -1)
863: options->compression = 0;
864: if (options->keepalives == -1)
865: options->keepalives = 1;
866: if (options->compression_level == -1)
867: options->compression_level = 6;
868: if (options->port == -1)
869: options->port = 0; /* Filled in ssh_connect. */
870: if (options->connection_attempts == -1)
1.84 markus 871: options->connection_attempts = 1;
1.17 markus 872: if (options->number_of_password_prompts == -1)
873: options->number_of_password_prompts = 3;
874: /* Selected in ssh_login(). */
875: if (options->cipher == -1)
876: options->cipher = SSH_CIPHER_NOT_SET;
1.31 markus 877: /* options->ciphers, default set in myproposals.h */
1.62 markus 878: /* options->macs, default set in myproposals.h */
1.76 markus 879: /* options->hostkeyalgorithms, default set in myproposals.h */
1.25 markus 880: if (options->protocol == SSH_PROTO_UNKNOWN)
1.69 markus 881: options->protocol = SSH_PROTO_1|SSH_PROTO_2;
1.17 markus 882: if (options->num_identity_files == 0) {
1.50 markus 883: if (options->protocol & SSH_PROTO_1) {
1.61 deraadt 884: len = 2 + strlen(_PATH_SSH_CLIENT_IDENTITY) + 1;
1.50 markus 885: options->identity_files[options->num_identity_files] =
1.61 deraadt 886: xmalloc(len);
887: snprintf(options->identity_files[options->num_identity_files++],
888: len, "~/%.100s", _PATH_SSH_CLIENT_IDENTITY);
1.50 markus 889: }
890: if (options->protocol & SSH_PROTO_2) {
1.63 deraadt 891: len = 2 + strlen(_PATH_SSH_CLIENT_ID_RSA) + 1;
892: options->identity_files[options->num_identity_files] =
893: xmalloc(len);
894: snprintf(options->identity_files[options->num_identity_files++],
895: len, "~/%.100s", _PATH_SSH_CLIENT_ID_RSA);
896:
1.61 deraadt 897: len = 2 + strlen(_PATH_SSH_CLIENT_ID_DSA) + 1;
1.50 markus 898: options->identity_files[options->num_identity_files] =
1.61 deraadt 899: xmalloc(len);
900: snprintf(options->identity_files[options->num_identity_files++],
901: len, "~/%.100s", _PATH_SSH_CLIENT_ID_DSA);
1.50 markus 902: }
1.27 markus 903: }
1.17 markus 904: if (options->escape_char == -1)
905: options->escape_char = '~';
906: if (options->system_hostfile == NULL)
1.55 markus 907: options->system_hostfile = _PATH_SSH_SYSTEM_HOSTFILE;
1.17 markus 908: if (options->user_hostfile == NULL)
1.55 markus 909: options->user_hostfile = _PATH_SSH_USER_HOSTFILE;
1.27 markus 910: if (options->system_hostfile2 == NULL)
1.55 markus 911: options->system_hostfile2 = _PATH_SSH_SYSTEM_HOSTFILE2;
1.27 markus 912: if (options->user_hostfile2 == NULL)
1.55 markus 913: options->user_hostfile2 = _PATH_SSH_USER_HOSTFILE2;
1.17 markus 914: if (options->log_level == (LogLevel) - 1)
1.54 markus 915: options->log_level = SYSLOG_LEVEL_INFO;
1.90 stevesk 916: if (options->clear_forwardings == 1)
917: clear_forwardings(options);
1.91 markus 918: if (options->no_host_authentication_for_localhost == - 1)
919: options->no_host_authentication_for_localhost = 0;
1.17 markus 920: /* options->proxy_command should not be set by default */
921: /* options->user will be set in the main program if appropriate */
922: /* options->hostname will be set in the main program if appropriate */
1.52 markus 923: /* options->host_key_alias should not be set by default */
1.67 markus 924: /* options->preferred_authentications will be set in ssh */
1.1 deraadt 925: }
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