Annotation of src/usr.bin/ssh/readconf.c, Revision 1.87
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"
1.87 ! markus 15: RCSID("$OpenBSD: readconf.c,v 1.86 2001/08/01 22:03:33 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,
1.85 jakob 117: oHostKeyAlgorithms, oBindAddress, oSmartcardDevice
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
1.17 markus 152: { "fallbacktorsh", oFallBackToRsh },
153: { "usersh", oUseRsh },
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 },
1.17 markus 187: { NULL, 0 }
1.13 markus 188: };
189:
1.19 markus 190: /*
191: * Adds a local TCP/IP port forward to options. Never returns if there is an
192: * error.
193: */
1.1 deraadt 194:
1.26 markus 195: void
1.22 markus 196: add_local_forward(Options *options, u_short port, const char *host,
197: u_short host_port)
1.1 deraadt 198: {
1.17 markus 199: Forward *fwd;
200: extern uid_t original_real_uid;
201: if (port < IPPORT_RESERVED && original_real_uid != 0)
1.64 millert 202: fatal("Privileged ports can only be forwarded by root.");
1.17 markus 203: if (options->num_local_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
204: fatal("Too many local forwards (max %d).", SSH_MAX_FORWARDS_PER_DIRECTION);
205: fwd = &options->local_forwards[options->num_local_forwards++];
206: fwd->port = port;
207: fwd->host = xstrdup(host);
208: fwd->host_port = host_port;
1.1 deraadt 209: }
210:
1.19 markus 211: /*
212: * Adds a remote TCP/IP port forward to options. Never returns if there is
213: * an error.
214: */
1.1 deraadt 215:
1.26 markus 216: void
1.22 markus 217: add_remote_forward(Options *options, u_short port, const char *host,
218: u_short host_port)
1.1 deraadt 219: {
1.17 markus 220: Forward *fwd;
221: if (options->num_remote_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
222: fatal("Too many remote forwards (max %d).",
223: SSH_MAX_FORWARDS_PER_DIRECTION);
224: fwd = &options->remote_forwards[options->num_remote_forwards++];
225: fwd->port = port;
226: fwd->host = xstrdup(host);
227: fwd->host_port = host_port;
1.1 deraadt 228: }
229:
1.19 markus 230: /*
1.70 stevesk 231: * Returns the number of the token pointed to by cp or oBadOption.
1.19 markus 232: */
1.1 deraadt 233:
1.26 markus 234: static OpCodes
1.17 markus 235: parse_token(const char *cp, const char *filename, int linenum)
1.1 deraadt 236: {
1.51 markus 237: u_int i;
1.1 deraadt 238:
1.17 markus 239: for (i = 0; keywords[i].name; i++)
1.20 markus 240: if (strcasecmp(cp, keywords[i].name) == 0)
1.17 markus 241: return keywords[i].opcode;
242:
1.75 stevesk 243: error("%s: line %d: Bad configuration option: %s",
244: filename, linenum, cp);
1.17 markus 245: return oBadOption;
1.1 deraadt 246: }
247:
1.19 markus 248: /*
249: * Processes a single option line as used in the configuration files. This
250: * only sets those values that have not already been set.
251: */
1.1 deraadt 252:
1.14 markus 253: int
254: process_config_line(Options *options, const char *host,
1.17 markus 255: char *line, const char *filename, int linenum,
256: int *activep)
1.1 deraadt 257: {
1.38 provos 258: char buf[256], *s, *string, **charptr, *endofnumber, *keyword, *arg;
1.22 markus 259: int opcode, *intptr, value;
260: u_short fwd_port, fwd_host_port;
1.1 deraadt 261:
1.42 provos 262: s = line;
263: /* Get the keyword. (Each line is supposed to begin with a keyword). */
264: keyword = strdelim(&s);
265: /* Ignore leading whitespace. */
266: if (*keyword == '\0')
1.43 markus 267: keyword = strdelim(&s);
1.56 deraadt 268: if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#')
1.17 markus 269: return 0;
270:
1.38 provos 271: opcode = parse_token(keyword, filename, linenum);
1.17 markus 272:
273: switch (opcode) {
274: case oBadOption:
1.19 markus 275: /* don't panic, but count bad options */
276: return -1;
1.17 markus 277: /* NOTREACHED */
278: case oForwardAgent:
279: intptr = &options->forward_agent;
280: parse_flag:
1.42 provos 281: arg = strdelim(&s);
1.40 ho 282: if (!arg || *arg == '\0')
1.17 markus 283: fatal("%.200s line %d: Missing yes/no argument.", filename, linenum);
284: value = 0; /* To avoid compiler warning... */
1.38 provos 285: if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
1.17 markus 286: value = 1;
1.38 provos 287: else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
1.17 markus 288: value = 0;
289: else
290: fatal("%.200s line %d: Bad yes/no argument.", filename, linenum);
291: if (*activep && *intptr == -1)
292: *intptr = value;
293: break;
294:
295: case oForwardX11:
296: intptr = &options->forward_x11;
297: goto parse_flag;
298:
299: case oGatewayPorts:
300: intptr = &options->gateway_ports;
301: goto parse_flag;
302:
303: case oUsePrivilegedPort:
304: intptr = &options->use_privileged_port;
305: goto parse_flag;
306:
307: case oRhostsAuthentication:
308: intptr = &options->rhosts_authentication;
309: goto parse_flag;
310:
311: case oPasswordAuthentication:
312: intptr = &options->password_authentication;
313: goto parse_flag;
314:
1.48 markus 315: case oKbdInteractiveAuthentication:
316: intptr = &options->kbd_interactive_authentication;
317: goto parse_flag;
318:
319: case oKbdInteractiveDevices:
320: charptr = &options->kbd_interactive_devices;
321: goto parse_string;
322:
1.50 markus 323: case oPubkeyAuthentication:
324: intptr = &options->pubkey_authentication;
1.30 markus 325: goto parse_flag;
326:
1.17 markus 327: case oRSAAuthentication:
328: intptr = &options->rsa_authentication;
329: goto parse_flag;
330:
331: case oRhostsRSAAuthentication:
332: intptr = &options->rhosts_rsa_authentication;
333: goto parse_flag;
334:
1.72 markus 335: case oHostbasedAuthentication:
336: intptr = &options->hostbased_authentication;
337: goto parse_flag;
338:
1.59 markus 339: case oChallengeResponseAuthentication:
1.78 markus 340: intptr = &options->challenge_response_authentication;
1.17 markus 341: goto parse_flag;
1.82 dugsong 342: #if defined(KRB4) || defined(KRB5)
1.17 markus 343: case oKerberosAuthentication:
344: intptr = &options->kerberos_authentication;
345: goto parse_flag;
1.82 dugsong 346: #endif
347: #if defined(AFS) || defined(KRB5)
1.17 markus 348: case oKerberosTgtPassing:
349: intptr = &options->kerberos_tgt_passing;
350: goto parse_flag;
1.82 dugsong 351: #endif
352: #ifdef AFS
1.17 markus 353: case oAFSTokenPassing:
354: intptr = &options->afs_token_passing;
355: goto parse_flag;
1.1 deraadt 356: #endif
1.17 markus 357: case oFallBackToRsh:
358: intptr = &options->fallback_to_rsh;
359: goto parse_flag;
360:
361: case oUseRsh:
362: intptr = &options->use_rsh;
363: goto parse_flag;
364:
365: case oBatchMode:
366: intptr = &options->batch_mode;
367: goto parse_flag;
368:
369: case oCheckHostIP:
370: intptr = &options->check_host_ip;
371: goto parse_flag;
372:
373: case oStrictHostKeyChecking:
374: intptr = &options->strict_host_key_checking;
1.42 provos 375: arg = strdelim(&s);
1.40 ho 376: if (!arg || *arg == '\0')
1.60 stevesk 377: fatal("%.200s line %d: Missing yes/no/ask argument.",
1.17 markus 378: filename, linenum);
379: value = 0; /* To avoid compiler warning... */
1.38 provos 380: if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
1.17 markus 381: value = 1;
1.38 provos 382: else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
1.17 markus 383: value = 0;
1.38 provos 384: else if (strcmp(arg, "ask") == 0)
1.17 markus 385: value = 2;
386: else
387: fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum);
388: if (*activep && *intptr == -1)
389: *intptr = value;
390: break;
391:
392: case oCompression:
393: intptr = &options->compression;
394: goto parse_flag;
395:
396: case oKeepAlives:
397: intptr = &options->keepalives;
398: goto parse_flag;
399:
400: case oNumberOfPasswordPrompts:
401: intptr = &options->number_of_password_prompts;
402: goto parse_int;
403:
404: case oCompressionLevel:
405: intptr = &options->compression_level;
406: goto parse_int;
407:
408: case oIdentityFile:
1.42 provos 409: arg = strdelim(&s);
1.40 ho 410: if (!arg || *arg == '\0')
1.17 markus 411: fatal("%.200s line %d: Missing argument.", filename, linenum);
412: if (*activep) {
1.50 markus 413: intptr = &options->num_identity_files;
1.27 markus 414: if (*intptr >= SSH_MAX_IDENTITY_FILES)
1.17 markus 415: fatal("%.200s line %d: Too many identity files specified (max %d).",
416: filename, linenum, SSH_MAX_IDENTITY_FILES);
1.50 markus 417: charptr = &options->identity_files[*intptr];
1.38 provos 418: *charptr = xstrdup(arg);
1.27 markus 419: *intptr = *intptr + 1;
1.17 markus 420: }
421: break;
422:
1.34 markus 423: case oXAuthLocation:
424: charptr=&options->xauth_location;
425: goto parse_string;
426:
1.17 markus 427: case oUser:
428: charptr = &options->user;
429: parse_string:
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 && *charptr == NULL)
1.38 provos 434: *charptr = xstrdup(arg);
1.17 markus 435: break;
436:
437: case oGlobalKnownHostsFile:
438: charptr = &options->system_hostfile;
439: goto parse_string;
440:
441: case oUserKnownHostsFile:
442: charptr = &options->user_hostfile;
443: goto parse_string;
444:
1.27 markus 445: case oGlobalKnownHostsFile2:
446: charptr = &options->system_hostfile2;
447: goto parse_string;
448:
449: case oUserKnownHostsFile2:
450: charptr = &options->user_hostfile2;
451: goto parse_string;
452:
1.17 markus 453: case oHostName:
454: charptr = &options->hostname;
455: goto parse_string;
456:
1.52 markus 457: case oHostKeyAlias:
458: charptr = &options->host_key_alias;
459: goto parse_string;
460:
1.67 markus 461: case oPreferredAuthentications:
462: charptr = &options->preferred_authentications;
463: goto parse_string;
464:
1.77 markus 465: case oBindAddress:
466: charptr = &options->bind_address;
467: goto parse_string;
468:
1.85 jakob 469: case oSmartcardDevice:
1.86 markus 470: charptr = &options->smartcard_device;
471: goto parse_string;
1.85 jakob 472:
1.17 markus 473: case oProxyCommand:
474: charptr = &options->proxy_command;
475: string = xstrdup("");
1.42 provos 476: while ((arg = strdelim(&s)) != NULL && *arg != '\0') {
1.38 provos 477: string = xrealloc(string, strlen(string) + strlen(arg) + 2);
1.17 markus 478: strcat(string, " ");
1.38 provos 479: strcat(string, arg);
1.17 markus 480: }
481: if (*activep && *charptr == NULL)
482: *charptr = string;
483: else
484: xfree(string);
485: return 0;
486:
487: case oPort:
488: intptr = &options->port;
489: parse_int:
1.42 provos 490: arg = strdelim(&s);
1.40 ho 491: if (!arg || *arg == '\0')
1.17 markus 492: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 493: if (arg[0] < '0' || arg[0] > '9')
1.17 markus 494: fatal("%.200s line %d: Bad number.", filename, linenum);
1.21 markus 495:
496: /* Octal, decimal, or hex format? */
1.38 provos 497: value = strtol(arg, &endofnumber, 0);
498: if (arg == endofnumber)
1.21 markus 499: fatal("%.200s line %d: Bad number.", filename, linenum);
1.17 markus 500: if (*activep && *intptr == -1)
501: *intptr = value;
502: break;
503:
504: case oConnectionAttempts:
505: intptr = &options->connection_attempts;
506: goto parse_int;
507:
508: case oCipher:
509: intptr = &options->cipher;
1.42 provos 510: arg = strdelim(&s);
1.40 ho 511: if (!arg || *arg == '\0')
1.32 markus 512: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 513: value = cipher_number(arg);
1.17 markus 514: if (value == -1)
515: fatal("%.200s line %d: Bad cipher '%s'.",
1.38 provos 516: filename, linenum, arg ? arg : "<NONE>");
1.17 markus 517: if (*activep && *intptr == -1)
518: *intptr = value;
519: break;
520:
1.25 markus 521: case oCiphers:
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: if (!ciphers_valid(arg))
1.31 markus 526: fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.",
1.38 provos 527: filename, linenum, arg ? arg : "<NONE>");
1.25 markus 528: if (*activep && options->ciphers == NULL)
1.38 provos 529: options->ciphers = xstrdup(arg);
1.25 markus 530: break;
531:
1.62 markus 532: case oMacs:
533: arg = strdelim(&s);
534: if (!arg || *arg == '\0')
535: fatal("%.200s line %d: Missing argument.", filename, linenum);
536: if (!mac_valid(arg))
537: fatal("%.200s line %d: Bad SSH2 Mac spec '%s'.",
538: filename, linenum, arg ? arg : "<NONE>");
539: if (*activep && options->macs == NULL)
540: options->macs = xstrdup(arg);
541: break;
542:
1.76 markus 543: case oHostKeyAlgorithms:
544: arg = strdelim(&s);
545: if (!arg || *arg == '\0')
546: fatal("%.200s line %d: Missing argument.", filename, linenum);
547: if (!key_names_valid2(arg))
548: fatal("%.200s line %d: Bad protocol 2 host key algorithms '%s'.",
549: filename, linenum, arg ? arg : "<NONE>");
550: if (*activep && options->hostkeyalgorithms == NULL)
551: options->hostkeyalgorithms = xstrdup(arg);
552: break;
553:
1.25 markus 554: case oProtocol:
555: intptr = &options->protocol;
1.42 provos 556: arg = strdelim(&s);
1.40 ho 557: if (!arg || *arg == '\0')
1.32 markus 558: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 559: value = proto_spec(arg);
1.25 markus 560: if (value == SSH_PROTO_UNKNOWN)
561: fatal("%.200s line %d: Bad protocol spec '%s'.",
1.38 provos 562: filename, linenum, arg ? arg : "<NONE>");
1.25 markus 563: if (*activep && *intptr == SSH_PROTO_UNKNOWN)
564: *intptr = value;
565: break;
566:
1.17 markus 567: case oLogLevel:
568: intptr = (int *) &options->log_level;
1.42 provos 569: arg = strdelim(&s);
1.38 provos 570: value = log_level_number(arg);
1.17 markus 571: if (value == (LogLevel) - 1)
1.64 millert 572: fatal("%.200s line %d: unsupported log level '%s'",
1.38 provos 573: filename, linenum, arg ? arg : "<NONE>");
1.17 markus 574: if (*activep && (LogLevel) * intptr == -1)
575: *intptr = (LogLevel) value;
576: break;
577:
578: case oRemoteForward:
1.42 provos 579: arg = strdelim(&s);
1.40 ho 580: if (!arg || *arg == '\0')
1.17 markus 581: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.74 stevesk 582: fwd_port = a2port(arg);
583: if (fwd_port == 0)
1.17 markus 584: fatal("%.200s line %d: Badly formatted port number.",
585: filename, linenum);
1.42 provos 586: arg = strdelim(&s);
1.40 ho 587: if (!arg || *arg == '\0')
1.17 markus 588: fatal("%.200s line %d: Missing second argument.",
589: filename, linenum);
1.38 provos 590: if (sscanf(arg, "%255[^:]:%hu", buf, &fwd_host_port) != 2)
1.17 markus 591: fatal("%.200s line %d: Badly formatted host:port.",
592: filename, linenum);
593: if (*activep)
594: add_remote_forward(options, fwd_port, buf, fwd_host_port);
595: break;
596:
597: case oLocalForward:
1.42 provos 598: arg = strdelim(&s);
1.40 ho 599: if (!arg || *arg == '\0')
1.17 markus 600: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.74 stevesk 601: fwd_port = a2port(arg);
602: if (fwd_port == 0)
1.17 markus 603: fatal("%.200s line %d: Badly formatted port number.",
604: filename, linenum);
1.42 provos 605: arg = strdelim(&s);
1.40 ho 606: if (!arg || *arg == '\0')
1.17 markus 607: fatal("%.200s line %d: Missing second argument.",
608: filename, linenum);
1.38 provos 609: if (sscanf(arg, "%255[^:]:%hu", buf, &fwd_host_port) != 2)
1.17 markus 610: fatal("%.200s line %d: Badly formatted host:port.",
611: filename, linenum);
612: if (*activep)
613: add_local_forward(options, fwd_port, buf, fwd_host_port);
614: break;
1.71 markus 615:
616: case oDynamicForward:
617: arg = strdelim(&s);
618: if (!arg || *arg == '\0')
619: fatal("%.200s line %d: Missing port argument.",
620: filename, linenum);
1.74 stevesk 621: fwd_port = a2port(arg);
622: if (fwd_port == 0)
1.71 markus 623: fatal("%.200s line %d: Badly formatted port number.",
624: filename, linenum);
1.87 ! markus 625: if (*activep)
! 626: add_local_forward(options, fwd_port, "socks4", 0);
1.72 markus 627: break;
1.17 markus 628:
629: case oHost:
630: *activep = 0;
1.42 provos 631: while ((arg = strdelim(&s)) != NULL && *arg != '\0')
1.38 provos 632: if (match_pattern(host, arg)) {
633: debug("Applying options for %.100s", arg);
1.17 markus 634: *activep = 1;
635: break;
636: }
1.42 provos 637: /* Avoid garbage check below, as strdelim is done. */
1.17 markus 638: return 0;
639:
640: case oEscapeChar:
641: intptr = &options->escape_char;
1.42 provos 642: arg = strdelim(&s);
1.40 ho 643: if (!arg || *arg == '\0')
1.17 markus 644: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 645: if (arg[0] == '^' && arg[2] == 0 &&
1.51 markus 646: (u_char) arg[1] >= 64 && (u_char) arg[1] < 128)
647: value = (u_char) arg[1] & 31;
1.38 provos 648: else if (strlen(arg) == 1)
1.51 markus 649: value = (u_char) arg[0];
1.38 provos 650: else if (strcmp(arg, "none") == 0)
1.79 stevesk 651: value = SSH_ESCAPECHAR_NONE;
1.17 markus 652: else {
653: fatal("%.200s line %d: Bad escape character.",
654: filename, linenum);
655: /* NOTREACHED */
656: value = 0; /* Avoid compiler warning. */
657: }
658: if (*activep && *intptr == -1)
659: *intptr = value;
660: break;
661:
662: default:
663: fatal("process_config_line: Unimplemented opcode %d", opcode);
664: }
665:
666: /* Check that there is no garbage at end of line. */
1.57 djm 667: if ((arg = strdelim(&s)) != NULL && *arg != '\0') {
1.39 ho 668: fatal("%.200s line %d: garbage at end of line; \"%.200s\".",
669: filename, linenum, arg);
670: }
1.17 markus 671: return 0;
1.1 deraadt 672: }
673:
674:
1.19 markus 675: /*
676: * Reads the config file and modifies the options accordingly. Options
677: * should already be initialized before this call. This never returns if
678: * there is an error. If the file does not exist, this returns immediately.
679: */
1.1 deraadt 680:
1.26 markus 681: void
1.17 markus 682: read_config_file(const char *filename, const char *host, Options *options)
1.1 deraadt 683: {
1.17 markus 684: FILE *f;
685: char line[1024];
686: int active, linenum;
687: int bad_options = 0;
688:
689: /* Open the file. */
690: f = fopen(filename, "r");
691: if (!f)
692: return;
693:
694: debug("Reading configuration data %.200s", filename);
695:
1.19 markus 696: /*
697: * Mark that we are now processing the options. This flag is turned
698: * on/off by Host specifications.
699: */
1.17 markus 700: active = 1;
701: linenum = 0;
702: while (fgets(line, sizeof(line), f)) {
703: /* Update line number counter. */
704: linenum++;
705: if (process_config_line(options, host, line, filename, linenum, &active) != 0)
706: bad_options++;
707: }
708: fclose(f);
709: if (bad_options > 0)
1.64 millert 710: fatal("%s: terminating, %d bad configuration options",
1.17 markus 711: filename, bad_options);
1.1 deraadt 712: }
713:
1.19 markus 714: /*
715: * Initializes options to special values that indicate that they have not yet
716: * been set. Read_config_file will only set options with this value. Options
717: * are processed in the following order: command line, user config file,
718: * system config file. Last, fill_default_options is called.
719: */
1.1 deraadt 720:
1.26 markus 721: void
1.17 markus 722: initialize_options(Options * options)
1.1 deraadt 723: {
1.17 markus 724: memset(options, 'X', sizeof(*options));
725: options->forward_agent = -1;
726: options->forward_x11 = -1;
1.34 markus 727: options->xauth_location = NULL;
1.17 markus 728: options->gateway_ports = -1;
729: options->use_privileged_port = -1;
730: options->rhosts_authentication = -1;
731: options->rsa_authentication = -1;
1.50 markus 732: options->pubkey_authentication = -1;
1.78 markus 733: options->challenge_response_authentication = -1;
1.82 dugsong 734: #if defined(KRB4) || defined(KRB5)
1.17 markus 735: options->kerberos_authentication = -1;
1.1 deraadt 736: #endif
1.82 dugsong 737: #if defined(AFS) || defined(KRB5)
738: options->kerberos_tgt_passing = -1;
739: #endif
1.5 dugsong 740: #ifdef AFS
1.17 markus 741: options->afs_token_passing = -1;
1.1 deraadt 742: #endif
1.17 markus 743: options->password_authentication = -1;
1.48 markus 744: options->kbd_interactive_authentication = -1;
745: options->kbd_interactive_devices = NULL;
1.17 markus 746: options->rhosts_rsa_authentication = -1;
1.72 markus 747: options->hostbased_authentication = -1;
1.17 markus 748: options->fallback_to_rsh = -1;
749: options->use_rsh = -1;
750: options->batch_mode = -1;
751: options->check_host_ip = -1;
752: options->strict_host_key_checking = -1;
753: options->compression = -1;
754: options->keepalives = -1;
755: options->compression_level = -1;
756: options->port = -1;
757: options->connection_attempts = -1;
758: options->number_of_password_prompts = -1;
759: options->cipher = -1;
1.25 markus 760: options->ciphers = NULL;
1.62 markus 761: options->macs = NULL;
1.76 markus 762: options->hostkeyalgorithms = NULL;
1.25 markus 763: options->protocol = SSH_PROTO_UNKNOWN;
1.17 markus 764: options->num_identity_files = 0;
765: options->hostname = NULL;
1.52 markus 766: options->host_key_alias = NULL;
1.17 markus 767: options->proxy_command = NULL;
768: options->user = NULL;
769: options->escape_char = -1;
770: options->system_hostfile = NULL;
771: options->user_hostfile = NULL;
1.27 markus 772: options->system_hostfile2 = NULL;
773: options->user_hostfile2 = NULL;
1.17 markus 774: options->num_local_forwards = 0;
775: options->num_remote_forwards = 0;
776: options->log_level = (LogLevel) - 1;
1.67 markus 777: options->preferred_authentications = NULL;
1.77 markus 778: options->bind_address = NULL;
1.86 markus 779: options->smartcard_device = NULL;
1.1 deraadt 780: }
781:
1.19 markus 782: /*
783: * Called after processing other sources of option data, this fills those
784: * options for which no value has been specified with their default values.
785: */
1.1 deraadt 786:
1.26 markus 787: void
1.17 markus 788: fill_default_options(Options * options)
1.1 deraadt 789: {
1.61 deraadt 790: int len;
791:
1.17 markus 792: if (options->forward_agent == -1)
1.33 markus 793: options->forward_agent = 0;
1.17 markus 794: if (options->forward_x11 == -1)
1.23 markus 795: options->forward_x11 = 0;
1.80 markus 796: #ifdef _PATH_XAUTH
1.34 markus 797: if (options->xauth_location == NULL)
1.80 markus 798: options->xauth_location = _PATH_XAUTH;
799: #endif
1.17 markus 800: if (options->gateway_ports == -1)
801: options->gateway_ports = 0;
802: if (options->use_privileged_port == -1)
1.65 markus 803: options->use_privileged_port = 0;
1.17 markus 804: if (options->rhosts_authentication == -1)
805: options->rhosts_authentication = 1;
806: if (options->rsa_authentication == -1)
807: options->rsa_authentication = 1;
1.50 markus 808: if (options->pubkey_authentication == -1)
809: options->pubkey_authentication = 1;
1.78 markus 810: if (options->challenge_response_authentication == -1)
1.83 markus 811: options->challenge_response_authentication = 1;
1.82 dugsong 812: #if defined(KRB4) || defined(KRB5)
1.17 markus 813: if (options->kerberos_authentication == -1)
1.45 provos 814: options->kerberos_authentication = 1;
1.82 dugsong 815: #endif
816: #if defined(AFS) || defined(KRB5)
1.17 markus 817: if (options->kerberos_tgt_passing == -1)
818: options->kerberos_tgt_passing = 1;
1.82 dugsong 819: #endif
820: #ifdef AFS
1.17 markus 821: if (options->afs_token_passing == -1)
822: options->afs_token_passing = 1;
1.82 dugsong 823: #endif
1.17 markus 824: if (options->password_authentication == -1)
825: options->password_authentication = 1;
1.48 markus 826: if (options->kbd_interactive_authentication == -1)
1.59 markus 827: options->kbd_interactive_authentication = 1;
1.17 markus 828: if (options->rhosts_rsa_authentication == -1)
829: options->rhosts_rsa_authentication = 1;
1.72 markus 830: if (options->hostbased_authentication == -1)
831: options->hostbased_authentication = 0;
1.17 markus 832: if (options->fallback_to_rsh == -1)
1.41 deraadt 833: options->fallback_to_rsh = 0;
1.17 markus 834: if (options->use_rsh == -1)
835: options->use_rsh = 0;
836: if (options->batch_mode == -1)
837: options->batch_mode = 0;
838: if (options->check_host_ip == -1)
839: options->check_host_ip = 1;
840: if (options->strict_host_key_checking == -1)
841: options->strict_host_key_checking = 2; /* 2 is default */
842: if (options->compression == -1)
843: options->compression = 0;
844: if (options->keepalives == -1)
845: options->keepalives = 1;
846: if (options->compression_level == -1)
847: options->compression_level = 6;
848: if (options->port == -1)
849: options->port = 0; /* Filled in ssh_connect. */
850: if (options->connection_attempts == -1)
1.84 markus 851: options->connection_attempts = 1;
1.17 markus 852: if (options->number_of_password_prompts == -1)
853: options->number_of_password_prompts = 3;
854: /* Selected in ssh_login(). */
855: if (options->cipher == -1)
856: options->cipher = SSH_CIPHER_NOT_SET;
1.31 markus 857: /* options->ciphers, default set in myproposals.h */
1.62 markus 858: /* options->macs, default set in myproposals.h */
1.76 markus 859: /* options->hostkeyalgorithms, default set in myproposals.h */
1.25 markus 860: if (options->protocol == SSH_PROTO_UNKNOWN)
1.69 markus 861: options->protocol = SSH_PROTO_1|SSH_PROTO_2;
1.17 markus 862: if (options->num_identity_files == 0) {
1.50 markus 863: if (options->protocol & SSH_PROTO_1) {
1.61 deraadt 864: len = 2 + strlen(_PATH_SSH_CLIENT_IDENTITY) + 1;
1.50 markus 865: options->identity_files[options->num_identity_files] =
1.61 deraadt 866: xmalloc(len);
867: snprintf(options->identity_files[options->num_identity_files++],
868: len, "~/%.100s", _PATH_SSH_CLIENT_IDENTITY);
1.50 markus 869: }
870: if (options->protocol & SSH_PROTO_2) {
1.63 deraadt 871: len = 2 + strlen(_PATH_SSH_CLIENT_ID_RSA) + 1;
872: options->identity_files[options->num_identity_files] =
873: xmalloc(len);
874: snprintf(options->identity_files[options->num_identity_files++],
875: len, "~/%.100s", _PATH_SSH_CLIENT_ID_RSA);
876:
1.61 deraadt 877: len = 2 + strlen(_PATH_SSH_CLIENT_ID_DSA) + 1;
1.50 markus 878: options->identity_files[options->num_identity_files] =
1.61 deraadt 879: xmalloc(len);
880: snprintf(options->identity_files[options->num_identity_files++],
881: len, "~/%.100s", _PATH_SSH_CLIENT_ID_DSA);
1.50 markus 882: }
1.27 markus 883: }
1.17 markus 884: if (options->escape_char == -1)
885: options->escape_char = '~';
886: if (options->system_hostfile == NULL)
1.55 markus 887: options->system_hostfile = _PATH_SSH_SYSTEM_HOSTFILE;
1.17 markus 888: if (options->user_hostfile == NULL)
1.55 markus 889: options->user_hostfile = _PATH_SSH_USER_HOSTFILE;
1.27 markus 890: if (options->system_hostfile2 == NULL)
1.55 markus 891: options->system_hostfile2 = _PATH_SSH_SYSTEM_HOSTFILE2;
1.27 markus 892: if (options->user_hostfile2 == NULL)
1.55 markus 893: options->user_hostfile2 = _PATH_SSH_USER_HOSTFILE2;
1.17 markus 894: if (options->log_level == (LogLevel) - 1)
1.54 markus 895: options->log_level = SYSLOG_LEVEL_INFO;
1.17 markus 896: /* options->proxy_command should not be set by default */
897: /* options->user will be set in the main program if appropriate */
898: /* options->hostname will be set in the main program if appropriate */
1.52 markus 899: /* options->host_key_alias should not be set by default */
1.67 markus 900: /* options->preferred_authentications will be set in ssh */
1.1 deraadt 901: }
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