Annotation of src/usr.bin/ssh/readconf.c, Revision 1.75
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"
1.75 ! stevesk 15: RCSID("$OpenBSD: readconf.c,v 1.74 2001/04/12 20:09:37 stevesk 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,
1.1 deraadt 99: #ifdef KRB4
1.17 markus 100: oKerberosAuthentication,
1.1 deraadt 101: #endif /* KRB4 */
102: #ifdef AFS
1.17 markus 103: oKerberosTgtPassing, oAFSTokenPassing,
1.1 deraadt 104: #endif
1.17 markus 105: oIdentityFile, oHostName, oPort, oCipher, oRemoteForward, oLocalForward,
106: oUser, oHost, oEscapeChar, oRhostsRSAAuthentication, oProxyCommand,
107: oGlobalKnownHostsFile, oUserKnownHostsFile, oConnectionAttempts,
108: oBatchMode, oCheckHostIP, oStrictHostKeyChecking, oCompression,
1.59 markus 109: oCompressionLevel, oKeepAlives, oNumberOfPasswordPrompts,
1.62 markus 110: oUsePrivilegedPort, oLogLevel, oCiphers, oProtocol, oMacs,
1.50 markus 111: oGlobalKnownHostsFile2, oUserKnownHostsFile2, oPubkeyAuthentication,
1.67 markus 112: oKbdInteractiveAuthentication, oKbdInteractiveDevices, oHostKeyAlias,
1.72 markus 113: oDynamicForward, oPreferredAuthentications, oHostbasedAuthentication
1.1 deraadt 114: } OpCodes;
115:
116: /* Textual representations of the tokens. */
117:
1.17 markus 118: static struct {
119: const char *name;
120: OpCodes opcode;
121: } keywords[] = {
122: { "forwardagent", oForwardAgent },
123: { "forwardx11", oForwardX11 },
1.34 markus 124: { "xauthlocation", oXAuthLocation },
1.17 markus 125: { "gatewayports", oGatewayPorts },
126: { "useprivilegedport", oUsePrivilegedPort },
127: { "rhostsauthentication", oRhostsAuthentication },
128: { "passwordauthentication", oPasswordAuthentication },
1.48 markus 129: { "kbdinteractiveauthentication", oKbdInteractiveAuthentication },
130: { "kbdinteractivedevices", oKbdInteractiveDevices },
1.17 markus 131: { "rsaauthentication", oRSAAuthentication },
1.50 markus 132: { "pubkeyauthentication", oPubkeyAuthentication },
1.59 markus 133: { "dsaauthentication", oPubkeyAuthentication }, /* alias */
1.72 markus 134: { "rhostsrsaauthentication", oRhostsRSAAuthentication },
1.73 markus 135: { "hostbasedauthentication", oHostbasedAuthentication },
1.59 markus 136: { "challengeresponseauthentication", oChallengeResponseAuthentication },
137: { "skeyauthentication", oChallengeResponseAuthentication }, /* alias */
138: { "tisauthentication", oChallengeResponseAuthentication }, /* alias */
1.1 deraadt 139: #ifdef KRB4
1.17 markus 140: { "kerberosauthentication", oKerberosAuthentication },
1.1 deraadt 141: #endif /* KRB4 */
1.5 dugsong 142: #ifdef AFS
1.17 markus 143: { "kerberostgtpassing", oKerberosTgtPassing },
144: { "afstokenpassing", oAFSTokenPassing },
1.1 deraadt 145: #endif
1.17 markus 146: { "fallbacktorsh", oFallBackToRsh },
147: { "usersh", oUseRsh },
148: { "identityfile", oIdentityFile },
1.50 markus 149: { "identityfile2", oIdentityFile }, /* alias */
1.17 markus 150: { "hostname", oHostName },
1.52 markus 151: { "hostkeyalias", oHostKeyAlias },
1.17 markus 152: { "proxycommand", oProxyCommand },
153: { "port", oPort },
154: { "cipher", oCipher },
1.25 markus 155: { "ciphers", oCiphers },
1.62 markus 156: { "macs", oMacs },
1.25 markus 157: { "protocol", oProtocol },
1.17 markus 158: { "remoteforward", oRemoteForward },
159: { "localforward", oLocalForward },
160: { "user", oUser },
161: { "host", oHost },
162: { "escapechar", oEscapeChar },
163: { "globalknownhostsfile", oGlobalKnownHostsFile },
164: { "userknownhostsfile", oUserKnownHostsFile },
1.27 markus 165: { "globalknownhostsfile2", oGlobalKnownHostsFile2 },
166: { "userknownhostsfile2", oUserKnownHostsFile2 },
1.17 markus 167: { "connectionattempts", oConnectionAttempts },
168: { "batchmode", oBatchMode },
169: { "checkhostip", oCheckHostIP },
170: { "stricthostkeychecking", oStrictHostKeyChecking },
171: { "compression", oCompression },
172: { "compressionlevel", oCompressionLevel },
173: { "keepalive", oKeepAlives },
174: { "numberofpasswordprompts", oNumberOfPasswordPrompts },
175: { "loglevel", oLogLevel },
1.71 markus 176: { "dynamicforward", oDynamicForward },
1.67 markus 177: { "preferredauthentications", oPreferredAuthentications },
1.17 markus 178: { NULL, 0 }
1.13 markus 179: };
180:
1.19 markus 181: /*
182: * Adds a local TCP/IP port forward to options. Never returns if there is an
183: * error.
184: */
1.1 deraadt 185:
1.26 markus 186: void
1.22 markus 187: add_local_forward(Options *options, u_short port, const char *host,
188: u_short host_port)
1.1 deraadt 189: {
1.17 markus 190: Forward *fwd;
191: extern uid_t original_real_uid;
192: if (port < IPPORT_RESERVED && original_real_uid != 0)
1.64 millert 193: fatal("Privileged ports can only be forwarded by root.");
1.17 markus 194: if (options->num_local_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
195: fatal("Too many local forwards (max %d).", SSH_MAX_FORWARDS_PER_DIRECTION);
196: fwd = &options->local_forwards[options->num_local_forwards++];
197: fwd->port = port;
198: fwd->host = xstrdup(host);
199: fwd->host_port = host_port;
1.1 deraadt 200: }
201:
1.19 markus 202: /*
203: * Adds a remote TCP/IP port forward to options. Never returns if there is
204: * an error.
205: */
1.1 deraadt 206:
1.26 markus 207: void
1.22 markus 208: add_remote_forward(Options *options, u_short port, const char *host,
209: u_short host_port)
1.1 deraadt 210: {
1.17 markus 211: Forward *fwd;
212: if (options->num_remote_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
213: fatal("Too many remote forwards (max %d).",
214: SSH_MAX_FORWARDS_PER_DIRECTION);
215: fwd = &options->remote_forwards[options->num_remote_forwards++];
216: fwd->port = port;
217: fwd->host = xstrdup(host);
218: fwd->host_port = host_port;
1.1 deraadt 219: }
220:
1.19 markus 221: /*
1.70 stevesk 222: * Returns the number of the token pointed to by cp or oBadOption.
1.19 markus 223: */
1.1 deraadt 224:
1.26 markus 225: static OpCodes
1.17 markus 226: parse_token(const char *cp, const char *filename, int linenum)
1.1 deraadt 227: {
1.51 markus 228: u_int i;
1.1 deraadt 229:
1.17 markus 230: for (i = 0; keywords[i].name; i++)
1.20 markus 231: if (strcasecmp(cp, keywords[i].name) == 0)
1.17 markus 232: return keywords[i].opcode;
233:
1.75 ! stevesk 234: error("%s: line %d: Bad configuration option: %s",
! 235: filename, linenum, cp);
1.17 markus 236: return oBadOption;
1.1 deraadt 237: }
238:
1.19 markus 239: /*
240: * Processes a single option line as used in the configuration files. This
241: * only sets those values that have not already been set.
242: */
1.1 deraadt 243:
1.14 markus 244: int
245: process_config_line(Options *options, const char *host,
1.17 markus 246: char *line, const char *filename, int linenum,
247: int *activep)
1.1 deraadt 248: {
1.38 provos 249: char buf[256], *s, *string, **charptr, *endofnumber, *keyword, *arg;
1.22 markus 250: int opcode, *intptr, value;
251: u_short fwd_port, fwd_host_port;
1.1 deraadt 252:
1.42 provos 253: s = line;
254: /* Get the keyword. (Each line is supposed to begin with a keyword). */
255: keyword = strdelim(&s);
256: /* Ignore leading whitespace. */
257: if (*keyword == '\0')
1.43 markus 258: keyword = strdelim(&s);
1.56 deraadt 259: if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#')
1.17 markus 260: return 0;
261:
1.38 provos 262: opcode = parse_token(keyword, filename, linenum);
1.17 markus 263:
264: switch (opcode) {
265: case oBadOption:
1.19 markus 266: /* don't panic, but count bad options */
267: return -1;
1.17 markus 268: /* NOTREACHED */
269: case oForwardAgent:
270: intptr = &options->forward_agent;
271: parse_flag:
1.42 provos 272: arg = strdelim(&s);
1.40 ho 273: if (!arg || *arg == '\0')
1.17 markus 274: fatal("%.200s line %d: Missing yes/no argument.", filename, linenum);
275: value = 0; /* To avoid compiler warning... */
1.38 provos 276: if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
1.17 markus 277: value = 1;
1.38 provos 278: else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
1.17 markus 279: value = 0;
280: else
281: fatal("%.200s line %d: Bad yes/no argument.", filename, linenum);
282: if (*activep && *intptr == -1)
283: *intptr = value;
284: break;
285:
286: case oForwardX11:
287: intptr = &options->forward_x11;
288: goto parse_flag;
289:
290: case oGatewayPorts:
291: intptr = &options->gateway_ports;
292: goto parse_flag;
293:
294: case oUsePrivilegedPort:
295: intptr = &options->use_privileged_port;
296: goto parse_flag;
297:
298: case oRhostsAuthentication:
299: intptr = &options->rhosts_authentication;
300: goto parse_flag;
301:
302: case oPasswordAuthentication:
303: intptr = &options->password_authentication;
304: goto parse_flag;
305:
1.48 markus 306: case oKbdInteractiveAuthentication:
307: intptr = &options->kbd_interactive_authentication;
308: goto parse_flag;
309:
310: case oKbdInteractiveDevices:
311: charptr = &options->kbd_interactive_devices;
312: goto parse_string;
313:
1.50 markus 314: case oPubkeyAuthentication:
315: intptr = &options->pubkey_authentication;
1.30 markus 316: goto parse_flag;
317:
1.17 markus 318: case oRSAAuthentication:
319: intptr = &options->rsa_authentication;
320: goto parse_flag;
321:
322: case oRhostsRSAAuthentication:
323: intptr = &options->rhosts_rsa_authentication;
324: goto parse_flag;
325:
1.72 markus 326: case oHostbasedAuthentication:
327: intptr = &options->hostbased_authentication;
328: goto parse_flag;
329:
1.59 markus 330: case oChallengeResponseAuthentication:
331: intptr = &options->challenge_reponse_authentication;
1.17 markus 332: goto parse_flag;
1.16 markus 333:
1.1 deraadt 334: #ifdef KRB4
1.17 markus 335: case oKerberosAuthentication:
336: intptr = &options->kerberos_authentication;
337: goto parse_flag;
1.1 deraadt 338: #endif /* KRB4 */
339:
1.5 dugsong 340: #ifdef AFS
1.17 markus 341: case oKerberosTgtPassing:
342: intptr = &options->kerberos_tgt_passing;
343: goto parse_flag;
344:
345: case oAFSTokenPassing:
346: intptr = &options->afs_token_passing;
347: goto parse_flag;
1.1 deraadt 348: #endif
1.17 markus 349:
350: case oFallBackToRsh:
351: intptr = &options->fallback_to_rsh;
352: goto parse_flag;
353:
354: case oUseRsh:
355: intptr = &options->use_rsh;
356: goto parse_flag;
357:
358: case oBatchMode:
359: intptr = &options->batch_mode;
360: goto parse_flag;
361:
362: case oCheckHostIP:
363: intptr = &options->check_host_ip;
364: goto parse_flag;
365:
366: case oStrictHostKeyChecking:
367: intptr = &options->strict_host_key_checking;
1.42 provos 368: arg = strdelim(&s);
1.40 ho 369: if (!arg || *arg == '\0')
1.60 stevesk 370: fatal("%.200s line %d: Missing yes/no/ask argument.",
1.17 markus 371: filename, linenum);
372: value = 0; /* To avoid compiler warning... */
1.38 provos 373: if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
1.17 markus 374: value = 1;
1.38 provos 375: else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
1.17 markus 376: value = 0;
1.38 provos 377: else if (strcmp(arg, "ask") == 0)
1.17 markus 378: value = 2;
379: else
380: fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum);
381: if (*activep && *intptr == -1)
382: *intptr = value;
383: break;
384:
385: case oCompression:
386: intptr = &options->compression;
387: goto parse_flag;
388:
389: case oKeepAlives:
390: intptr = &options->keepalives;
391: goto parse_flag;
392:
393: case oNumberOfPasswordPrompts:
394: intptr = &options->number_of_password_prompts;
395: goto parse_int;
396:
397: case oCompressionLevel:
398: intptr = &options->compression_level;
399: goto parse_int;
400:
401: case oIdentityFile:
1.42 provos 402: arg = strdelim(&s);
1.40 ho 403: if (!arg || *arg == '\0')
1.17 markus 404: fatal("%.200s line %d: Missing argument.", filename, linenum);
405: if (*activep) {
1.50 markus 406: intptr = &options->num_identity_files;
1.27 markus 407: if (*intptr >= SSH_MAX_IDENTITY_FILES)
1.17 markus 408: fatal("%.200s line %d: Too many identity files specified (max %d).",
409: filename, linenum, SSH_MAX_IDENTITY_FILES);
1.50 markus 410: charptr = &options->identity_files[*intptr];
1.38 provos 411: *charptr = xstrdup(arg);
1.27 markus 412: *intptr = *intptr + 1;
1.17 markus 413: }
414: break;
415:
1.34 markus 416: case oXAuthLocation:
417: charptr=&options->xauth_location;
418: goto parse_string;
419:
1.17 markus 420: case oUser:
421: charptr = &options->user;
422: parse_string:
1.42 provos 423: arg = strdelim(&s);
1.40 ho 424: if (!arg || *arg == '\0')
1.17 markus 425: fatal("%.200s line %d: Missing argument.", filename, linenum);
426: if (*activep && *charptr == NULL)
1.38 provos 427: *charptr = xstrdup(arg);
1.17 markus 428: break;
429:
430: case oGlobalKnownHostsFile:
431: charptr = &options->system_hostfile;
432: goto parse_string;
433:
434: case oUserKnownHostsFile:
435: charptr = &options->user_hostfile;
436: goto parse_string;
437:
1.27 markus 438: case oGlobalKnownHostsFile2:
439: charptr = &options->system_hostfile2;
440: goto parse_string;
441:
442: case oUserKnownHostsFile2:
443: charptr = &options->user_hostfile2;
444: goto parse_string;
445:
1.17 markus 446: case oHostName:
447: charptr = &options->hostname;
448: goto parse_string;
449:
1.52 markus 450: case oHostKeyAlias:
451: charptr = &options->host_key_alias;
452: goto parse_string;
453:
1.67 markus 454: case oPreferredAuthentications:
455: charptr = &options->preferred_authentications;
456: goto parse_string;
457:
1.17 markus 458: case oProxyCommand:
459: charptr = &options->proxy_command;
460: string = xstrdup("");
1.42 provos 461: while ((arg = strdelim(&s)) != NULL && *arg != '\0') {
1.38 provos 462: string = xrealloc(string, strlen(string) + strlen(arg) + 2);
1.17 markus 463: strcat(string, " ");
1.38 provos 464: strcat(string, arg);
1.17 markus 465: }
466: if (*activep && *charptr == NULL)
467: *charptr = string;
468: else
469: xfree(string);
470: return 0;
471:
472: case oPort:
473: intptr = &options->port;
474: parse_int:
1.42 provos 475: arg = strdelim(&s);
1.40 ho 476: if (!arg || *arg == '\0')
1.17 markus 477: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 478: if (arg[0] < '0' || arg[0] > '9')
1.17 markus 479: fatal("%.200s line %d: Bad number.", filename, linenum);
1.21 markus 480:
481: /* Octal, decimal, or hex format? */
1.38 provos 482: value = strtol(arg, &endofnumber, 0);
483: if (arg == endofnumber)
1.21 markus 484: fatal("%.200s line %d: Bad number.", filename, linenum);
1.17 markus 485: if (*activep && *intptr == -1)
486: *intptr = value;
487: break;
488:
489: case oConnectionAttempts:
490: intptr = &options->connection_attempts;
491: goto parse_int;
492:
493: case oCipher:
494: intptr = &options->cipher;
1.42 provos 495: arg = strdelim(&s);
1.40 ho 496: if (!arg || *arg == '\0')
1.32 markus 497: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 498: value = cipher_number(arg);
1.17 markus 499: if (value == -1)
500: fatal("%.200s line %d: Bad cipher '%s'.",
1.38 provos 501: filename, linenum, arg ? arg : "<NONE>");
1.17 markus 502: if (*activep && *intptr == -1)
503: *intptr = value;
504: break;
505:
1.25 markus 506: case oCiphers:
1.42 provos 507: arg = strdelim(&s);
1.40 ho 508: if (!arg || *arg == '\0')
1.32 markus 509: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 510: if (!ciphers_valid(arg))
1.31 markus 511: fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.",
1.38 provos 512: filename, linenum, arg ? arg : "<NONE>");
1.25 markus 513: if (*activep && options->ciphers == NULL)
1.38 provos 514: options->ciphers = xstrdup(arg);
1.25 markus 515: break;
516:
1.62 markus 517: case oMacs:
518: arg = strdelim(&s);
519: if (!arg || *arg == '\0')
520: fatal("%.200s line %d: Missing argument.", filename, linenum);
521: if (!mac_valid(arg))
522: fatal("%.200s line %d: Bad SSH2 Mac spec '%s'.",
523: filename, linenum, arg ? arg : "<NONE>");
524: if (*activep && options->macs == NULL)
525: options->macs = xstrdup(arg);
526: break;
527:
1.25 markus 528: case oProtocol:
529: intptr = &options->protocol;
1.42 provos 530: arg = strdelim(&s);
1.40 ho 531: if (!arg || *arg == '\0')
1.32 markus 532: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 533: value = proto_spec(arg);
1.25 markus 534: if (value == SSH_PROTO_UNKNOWN)
535: fatal("%.200s line %d: Bad protocol spec '%s'.",
1.38 provos 536: filename, linenum, arg ? arg : "<NONE>");
1.25 markus 537: if (*activep && *intptr == SSH_PROTO_UNKNOWN)
538: *intptr = value;
539: break;
540:
1.17 markus 541: case oLogLevel:
542: intptr = (int *) &options->log_level;
1.42 provos 543: arg = strdelim(&s);
1.38 provos 544: value = log_level_number(arg);
1.17 markus 545: if (value == (LogLevel) - 1)
1.64 millert 546: fatal("%.200s line %d: unsupported log level '%s'",
1.38 provos 547: filename, linenum, arg ? arg : "<NONE>");
1.17 markus 548: if (*activep && (LogLevel) * intptr == -1)
549: *intptr = (LogLevel) value;
550: break;
551:
552: case oRemoteForward:
1.42 provos 553: arg = strdelim(&s);
1.40 ho 554: if (!arg || *arg == '\0')
1.17 markus 555: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.74 stevesk 556: fwd_port = a2port(arg);
557: if (fwd_port == 0)
1.17 markus 558: fatal("%.200s line %d: Badly formatted port number.",
559: filename, linenum);
1.42 provos 560: arg = strdelim(&s);
1.40 ho 561: if (!arg || *arg == '\0')
1.17 markus 562: fatal("%.200s line %d: Missing second argument.",
563: filename, linenum);
1.38 provos 564: if (sscanf(arg, "%255[^:]:%hu", buf, &fwd_host_port) != 2)
1.17 markus 565: fatal("%.200s line %d: Badly formatted host:port.",
566: filename, linenum);
567: if (*activep)
568: add_remote_forward(options, fwd_port, buf, fwd_host_port);
569: break;
570:
571: case oLocalForward:
1.42 provos 572: arg = strdelim(&s);
1.40 ho 573: if (!arg || *arg == '\0')
1.17 markus 574: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.74 stevesk 575: fwd_port = a2port(arg);
576: if (fwd_port == 0)
1.17 markus 577: fatal("%.200s line %d: Badly formatted port number.",
578: filename, linenum);
1.42 provos 579: arg = strdelim(&s);
1.40 ho 580: if (!arg || *arg == '\0')
1.17 markus 581: fatal("%.200s line %d: Missing second argument.",
582: filename, linenum);
1.38 provos 583: if (sscanf(arg, "%255[^:]:%hu", buf, &fwd_host_port) != 2)
1.17 markus 584: fatal("%.200s line %d: Badly formatted host:port.",
585: filename, linenum);
586: if (*activep)
587: add_local_forward(options, fwd_port, buf, fwd_host_port);
588: break;
1.71 markus 589:
590: case oDynamicForward:
591: arg = strdelim(&s);
592: if (!arg || *arg == '\0')
593: fatal("%.200s line %d: Missing port argument.",
594: filename, linenum);
1.74 stevesk 595: fwd_port = a2port(arg);
596: if (fwd_port == 0)
1.71 markus 597: fatal("%.200s line %d: Badly formatted port number.",
598: filename, linenum);
599: add_local_forward(options, fwd_port, "socks4", 0);
1.72 markus 600: break;
1.17 markus 601:
602: case oHost:
603: *activep = 0;
1.42 provos 604: while ((arg = strdelim(&s)) != NULL && *arg != '\0')
1.38 provos 605: if (match_pattern(host, arg)) {
606: debug("Applying options for %.100s", arg);
1.17 markus 607: *activep = 1;
608: break;
609: }
1.42 provos 610: /* Avoid garbage check below, as strdelim is done. */
1.17 markus 611: return 0;
612:
613: case oEscapeChar:
614: intptr = &options->escape_char;
1.42 provos 615: arg = strdelim(&s);
1.40 ho 616: if (!arg || *arg == '\0')
1.17 markus 617: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 618: if (arg[0] == '^' && arg[2] == 0 &&
1.51 markus 619: (u_char) arg[1] >= 64 && (u_char) arg[1] < 128)
620: value = (u_char) arg[1] & 31;
1.38 provos 621: else if (strlen(arg) == 1)
1.51 markus 622: value = (u_char) arg[0];
1.38 provos 623: else if (strcmp(arg, "none") == 0)
1.17 markus 624: value = -2;
625: else {
626: fatal("%.200s line %d: Bad escape character.",
627: filename, linenum);
628: /* NOTREACHED */
629: value = 0; /* Avoid compiler warning. */
630: }
631: if (*activep && *intptr == -1)
632: *intptr = value;
633: break;
634:
635: default:
636: fatal("process_config_line: Unimplemented opcode %d", opcode);
637: }
638:
639: /* Check that there is no garbage at end of line. */
1.57 djm 640: if ((arg = strdelim(&s)) != NULL && *arg != '\0') {
1.39 ho 641: fatal("%.200s line %d: garbage at end of line; \"%.200s\".",
642: filename, linenum, arg);
643: }
1.17 markus 644: return 0;
1.1 deraadt 645: }
646:
647:
1.19 markus 648: /*
649: * Reads the config file and modifies the options accordingly. Options
650: * should already be initialized before this call. This never returns if
651: * there is an error. If the file does not exist, this returns immediately.
652: */
1.1 deraadt 653:
1.26 markus 654: void
1.17 markus 655: read_config_file(const char *filename, const char *host, Options *options)
1.1 deraadt 656: {
1.17 markus 657: FILE *f;
658: char line[1024];
659: int active, linenum;
660: int bad_options = 0;
661:
662: /* Open the file. */
663: f = fopen(filename, "r");
664: if (!f)
665: return;
666:
667: debug("Reading configuration data %.200s", filename);
668:
1.19 markus 669: /*
670: * Mark that we are now processing the options. This flag is turned
671: * on/off by Host specifications.
672: */
1.17 markus 673: active = 1;
674: linenum = 0;
675: while (fgets(line, sizeof(line), f)) {
676: /* Update line number counter. */
677: linenum++;
678: if (process_config_line(options, host, line, filename, linenum, &active) != 0)
679: bad_options++;
680: }
681: fclose(f);
682: if (bad_options > 0)
1.64 millert 683: fatal("%s: terminating, %d bad configuration options",
1.17 markus 684: filename, bad_options);
1.1 deraadt 685: }
686:
1.19 markus 687: /*
688: * Initializes options to special values that indicate that they have not yet
689: * been set. Read_config_file will only set options with this value. Options
690: * are processed in the following order: command line, user config file,
691: * system config file. Last, fill_default_options is called.
692: */
1.1 deraadt 693:
1.26 markus 694: void
1.17 markus 695: initialize_options(Options * options)
1.1 deraadt 696: {
1.17 markus 697: memset(options, 'X', sizeof(*options));
698: options->forward_agent = -1;
699: options->forward_x11 = -1;
1.34 markus 700: options->xauth_location = NULL;
1.17 markus 701: options->gateway_ports = -1;
702: options->use_privileged_port = -1;
703: options->rhosts_authentication = -1;
704: options->rsa_authentication = -1;
1.50 markus 705: options->pubkey_authentication = -1;
1.59 markus 706: options->challenge_reponse_authentication = -1;
1.1 deraadt 707: #ifdef KRB4
1.17 markus 708: options->kerberos_authentication = -1;
1.1 deraadt 709: #endif
1.5 dugsong 710: #ifdef AFS
1.17 markus 711: options->kerberos_tgt_passing = -1;
712: options->afs_token_passing = -1;
1.1 deraadt 713: #endif
1.17 markus 714: options->password_authentication = -1;
1.48 markus 715: options->kbd_interactive_authentication = -1;
716: options->kbd_interactive_devices = NULL;
1.17 markus 717: options->rhosts_rsa_authentication = -1;
1.72 markus 718: options->hostbased_authentication = -1;
1.17 markus 719: options->fallback_to_rsh = -1;
720: options->use_rsh = -1;
721: options->batch_mode = -1;
722: options->check_host_ip = -1;
723: options->strict_host_key_checking = -1;
724: options->compression = -1;
725: options->keepalives = -1;
726: options->compression_level = -1;
727: options->port = -1;
728: options->connection_attempts = -1;
729: options->number_of_password_prompts = -1;
730: options->cipher = -1;
1.25 markus 731: options->ciphers = NULL;
1.62 markus 732: options->macs = NULL;
1.25 markus 733: options->protocol = SSH_PROTO_UNKNOWN;
1.17 markus 734: options->num_identity_files = 0;
735: options->hostname = NULL;
1.52 markus 736: options->host_key_alias = NULL;
1.17 markus 737: options->proxy_command = NULL;
738: options->user = NULL;
739: options->escape_char = -1;
740: options->system_hostfile = NULL;
741: options->user_hostfile = NULL;
1.27 markus 742: options->system_hostfile2 = NULL;
743: options->user_hostfile2 = NULL;
1.17 markus 744: options->num_local_forwards = 0;
745: options->num_remote_forwards = 0;
746: options->log_level = (LogLevel) - 1;
1.67 markus 747: options->preferred_authentications = NULL;
1.1 deraadt 748: }
749:
1.19 markus 750: /*
751: * Called after processing other sources of option data, this fills those
752: * options for which no value has been specified with their default values.
753: */
1.1 deraadt 754:
1.26 markus 755: void
1.17 markus 756: fill_default_options(Options * options)
1.1 deraadt 757: {
1.61 deraadt 758: int len;
759:
1.17 markus 760: if (options->forward_agent == -1)
1.33 markus 761: options->forward_agent = 0;
1.17 markus 762: if (options->forward_x11 == -1)
1.23 markus 763: options->forward_x11 = 0;
1.34 markus 764: #ifdef XAUTH_PATH
765: if (options->xauth_location == NULL)
1.35 markus 766: options->xauth_location = XAUTH_PATH;
1.34 markus 767: #endif /* XAUTH_PATH */
1.17 markus 768: if (options->gateway_ports == -1)
769: options->gateway_ports = 0;
770: if (options->use_privileged_port == -1)
1.65 markus 771: options->use_privileged_port = 0;
1.17 markus 772: if (options->rhosts_authentication == -1)
773: options->rhosts_authentication = 1;
774: if (options->rsa_authentication == -1)
775: options->rsa_authentication = 1;
1.50 markus 776: if (options->pubkey_authentication == -1)
777: options->pubkey_authentication = 1;
1.59 markus 778: if (options->challenge_reponse_authentication == -1)
779: options->challenge_reponse_authentication = 0;
1.1 deraadt 780: #ifdef KRB4
1.17 markus 781: if (options->kerberos_authentication == -1)
1.45 provos 782: options->kerberos_authentication = 1;
1.5 dugsong 783: #endif /* KRB4 */
784: #ifdef AFS
1.17 markus 785: if (options->kerberos_tgt_passing == -1)
786: options->kerberos_tgt_passing = 1;
787: if (options->afs_token_passing == -1)
788: options->afs_token_passing = 1;
1.5 dugsong 789: #endif /* AFS */
1.17 markus 790: if (options->password_authentication == -1)
791: options->password_authentication = 1;
1.48 markus 792: if (options->kbd_interactive_authentication == -1)
1.59 markus 793: options->kbd_interactive_authentication = 1;
1.17 markus 794: if (options->rhosts_rsa_authentication == -1)
795: options->rhosts_rsa_authentication = 1;
1.72 markus 796: if (options->hostbased_authentication == -1)
797: options->hostbased_authentication = 0;
1.17 markus 798: if (options->fallback_to_rsh == -1)
1.41 deraadt 799: options->fallback_to_rsh = 0;
1.17 markus 800: if (options->use_rsh == -1)
801: options->use_rsh = 0;
802: if (options->batch_mode == -1)
803: options->batch_mode = 0;
804: if (options->check_host_ip == -1)
805: options->check_host_ip = 1;
806: if (options->strict_host_key_checking == -1)
807: options->strict_host_key_checking = 2; /* 2 is default */
808: if (options->compression == -1)
809: options->compression = 0;
810: if (options->keepalives == -1)
811: options->keepalives = 1;
812: if (options->compression_level == -1)
813: options->compression_level = 6;
814: if (options->port == -1)
815: options->port = 0; /* Filled in ssh_connect. */
816: if (options->connection_attempts == -1)
817: options->connection_attempts = 4;
818: if (options->number_of_password_prompts == -1)
819: options->number_of_password_prompts = 3;
820: /* Selected in ssh_login(). */
821: if (options->cipher == -1)
822: options->cipher = SSH_CIPHER_NOT_SET;
1.31 markus 823: /* options->ciphers, default set in myproposals.h */
1.62 markus 824: /* options->macs, default set in myproposals.h */
1.25 markus 825: if (options->protocol == SSH_PROTO_UNKNOWN)
1.69 markus 826: options->protocol = SSH_PROTO_1|SSH_PROTO_2;
1.17 markus 827: if (options->num_identity_files == 0) {
1.50 markus 828: if (options->protocol & SSH_PROTO_1) {
1.61 deraadt 829: len = 2 + strlen(_PATH_SSH_CLIENT_IDENTITY) + 1;
1.50 markus 830: options->identity_files[options->num_identity_files] =
1.61 deraadt 831: xmalloc(len);
832: snprintf(options->identity_files[options->num_identity_files++],
833: len, "~/%.100s", _PATH_SSH_CLIENT_IDENTITY);
1.50 markus 834: }
835: if (options->protocol & SSH_PROTO_2) {
1.63 deraadt 836: len = 2 + strlen(_PATH_SSH_CLIENT_ID_RSA) + 1;
837: options->identity_files[options->num_identity_files] =
838: xmalloc(len);
839: snprintf(options->identity_files[options->num_identity_files++],
840: len, "~/%.100s", _PATH_SSH_CLIENT_ID_RSA);
841:
1.61 deraadt 842: len = 2 + strlen(_PATH_SSH_CLIENT_ID_DSA) + 1;
1.50 markus 843: options->identity_files[options->num_identity_files] =
1.61 deraadt 844: xmalloc(len);
845: snprintf(options->identity_files[options->num_identity_files++],
846: len, "~/%.100s", _PATH_SSH_CLIENT_ID_DSA);
1.50 markus 847: }
1.27 markus 848: }
1.17 markus 849: if (options->escape_char == -1)
850: options->escape_char = '~';
851: if (options->system_hostfile == NULL)
1.55 markus 852: options->system_hostfile = _PATH_SSH_SYSTEM_HOSTFILE;
1.17 markus 853: if (options->user_hostfile == NULL)
1.55 markus 854: options->user_hostfile = _PATH_SSH_USER_HOSTFILE;
1.27 markus 855: if (options->system_hostfile2 == NULL)
1.55 markus 856: options->system_hostfile2 = _PATH_SSH_SYSTEM_HOSTFILE2;
1.27 markus 857: if (options->user_hostfile2 == NULL)
1.55 markus 858: options->user_hostfile2 = _PATH_SSH_USER_HOSTFILE2;
1.17 markus 859: if (options->log_level == (LogLevel) - 1)
1.54 markus 860: options->log_level = SYSLOG_LEVEL_INFO;
1.17 markus 861: /* options->proxy_command should not be set by default */
862: /* options->user will be set in the main program if appropriate */
863: /* options->hostname will be set in the main program if appropriate */
1.52 markus 864: /* options->host_key_alias should not be set by default */
1.67 markus 865: /* options->preferred_authentications will be set in ssh */
1.1 deraadt 866: }
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