Annotation of src/usr.bin/ssh/readconf.c, Revision 1.57
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"
1.57 ! djm 15: RCSID("$OpenBSD: readconf.c,v 1.56 2001/01/20 17:59:40 deraadt Exp $");
1.1 deraadt 16:
17: #include "ssh.h"
18: #include "readconf.h"
1.24 markus 19: #include "match.h"
1.1 deraadt 20: #include "xmalloc.h"
1.25 markus 21: #include "compat.h"
1.55 markus 22: #include "pathnames.h"
1.1 deraadt 23:
24: /* Format of the configuration file:
25:
26: # Configuration data is parsed as follows:
27: # 1. command line options
28: # 2. user-specific file
29: # 3. system-wide file
30: # Any configuration value is only changed the first time it is set.
31: # Thus, host-specific definitions should be at the beginning of the
32: # configuration file, and defaults at the end.
33:
34: # Host-specific declarations. These may override anything above. A single
35: # host may match multiple declarations; these are processed in the order
36: # that they are given in.
37:
38: Host *.ngs.fi ngs.fi
39: FallBackToRsh no
40:
41: Host fake.com
42: HostName another.host.name.real.org
43: User blaah
44: Port 34289
45: ForwardX11 no
46: ForwardAgent no
47:
48: Host books.com
49: RemoteForward 9999 shadows.cs.hut.fi:9999
50: Cipher 3des
51:
52: Host fascist.blob.com
53: Port 23123
54: User tylonen
55: RhostsAuthentication no
56: PasswordAuthentication no
57:
58: Host puukko.hut.fi
59: User t35124p
60: ProxyCommand ssh-proxy %h %p
61:
62: Host *.fr
63: UseRsh yes
64:
65: Host *.su
66: Cipher none
67: PasswordAuthentication no
68:
69: # Defaults for various options
70: Host *
71: ForwardAgent no
1.50 markus 72: ForwardX11 no
1.1 deraadt 73: RhostsAuthentication yes
74: PasswordAuthentication yes
75: RSAAuthentication yes
76: RhostsRSAAuthentication yes
77: FallBackToRsh no
78: UseRsh no
79: StrictHostKeyChecking yes
80: KeepAlives no
81: IdentityFile ~/.ssh/identity
82: Port 22
83: EscapeChar ~
84:
85: */
86:
87: /* Keyword tokens. */
88:
1.17 markus 89: typedef enum {
90: oBadOption,
91: oForwardAgent, oForwardX11, oGatewayPorts, oRhostsAuthentication,
92: oPasswordAuthentication, oRSAAuthentication, oFallBackToRsh, oUseRsh,
1.34 markus 93: oSkeyAuthentication, oXAuthLocation,
1.1 deraadt 94: #ifdef KRB4
1.17 markus 95: oKerberosAuthentication,
1.1 deraadt 96: #endif /* KRB4 */
97: #ifdef AFS
1.17 markus 98: oKerberosTgtPassing, oAFSTokenPassing,
1.1 deraadt 99: #endif
1.17 markus 100: oIdentityFile, oHostName, oPort, oCipher, oRemoteForward, oLocalForward,
101: oUser, oHost, oEscapeChar, oRhostsRSAAuthentication, oProxyCommand,
102: oGlobalKnownHostsFile, oUserKnownHostsFile, oConnectionAttempts,
103: oBatchMode, oCheckHostIP, oStrictHostKeyChecking, oCompression,
104: oCompressionLevel, oKeepAlives, oNumberOfPasswordPrompts, oTISAuthentication,
1.50 markus 105: oUsePrivilegedPort, oLogLevel, oCiphers, oProtocol,
106: oGlobalKnownHostsFile2, oUserKnownHostsFile2, oPubkeyAuthentication,
1.52 markus 107: oKbdInteractiveAuthentication, oKbdInteractiveDevices, oHostKeyAlias
1.1 deraadt 108: } OpCodes;
109:
110: /* Textual representations of the tokens. */
111:
1.17 markus 112: static struct {
113: const char *name;
114: OpCodes opcode;
115: } keywords[] = {
116: { "forwardagent", oForwardAgent },
117: { "forwardx11", oForwardX11 },
1.34 markus 118: { "xauthlocation", oXAuthLocation },
1.17 markus 119: { "gatewayports", oGatewayPorts },
120: { "useprivilegedport", oUsePrivilegedPort },
121: { "rhostsauthentication", oRhostsAuthentication },
122: { "passwordauthentication", oPasswordAuthentication },
1.48 markus 123: { "kbdinteractiveauthentication", oKbdInteractiveAuthentication },
124: { "kbdinteractivedevices", oKbdInteractiveDevices },
1.17 markus 125: { "rsaauthentication", oRSAAuthentication },
1.50 markus 126: { "pubkeyauthentication", oPubkeyAuthentication },
127: { "dsaauthentication", oPubkeyAuthentication }, /* alias */
1.17 markus 128: { "skeyauthentication", oSkeyAuthentication },
1.1 deraadt 129: #ifdef KRB4
1.17 markus 130: { "kerberosauthentication", oKerberosAuthentication },
1.1 deraadt 131: #endif /* KRB4 */
1.5 dugsong 132: #ifdef AFS
1.17 markus 133: { "kerberostgtpassing", oKerberosTgtPassing },
134: { "afstokenpassing", oAFSTokenPassing },
1.1 deraadt 135: #endif
1.17 markus 136: { "fallbacktorsh", oFallBackToRsh },
137: { "usersh", oUseRsh },
138: { "identityfile", oIdentityFile },
1.50 markus 139: { "identityfile2", oIdentityFile }, /* alias */
1.17 markus 140: { "hostname", oHostName },
1.52 markus 141: { "hostkeyalias", oHostKeyAlias },
1.17 markus 142: { "proxycommand", oProxyCommand },
143: { "port", oPort },
144: { "cipher", oCipher },
1.25 markus 145: { "ciphers", oCiphers },
146: { "protocol", oProtocol },
1.17 markus 147: { "remoteforward", oRemoteForward },
148: { "localforward", oLocalForward },
149: { "user", oUser },
150: { "host", oHost },
151: { "escapechar", oEscapeChar },
152: { "rhostsrsaauthentication", oRhostsRSAAuthentication },
153: { "globalknownhostsfile", oGlobalKnownHostsFile },
154: { "userknownhostsfile", oUserKnownHostsFile },
1.27 markus 155: { "globalknownhostsfile2", oGlobalKnownHostsFile2 },
156: { "userknownhostsfile2", oUserKnownHostsFile2 },
1.17 markus 157: { "connectionattempts", oConnectionAttempts },
158: { "batchmode", oBatchMode },
159: { "checkhostip", oCheckHostIP },
160: { "stricthostkeychecking", oStrictHostKeyChecking },
161: { "compression", oCompression },
162: { "compressionlevel", oCompressionLevel },
163: { "keepalive", oKeepAlives },
164: { "numberofpasswordprompts", oNumberOfPasswordPrompts },
165: { "tisauthentication", oTISAuthentication },
166: { "loglevel", oLogLevel },
167: { NULL, 0 }
1.13 markus 168: };
169:
1.19 markus 170: /*
171: * Adds a local TCP/IP port forward to options. Never returns if there is an
172: * error.
173: */
1.1 deraadt 174:
1.26 markus 175: void
1.22 markus 176: add_local_forward(Options *options, u_short port, const char *host,
177: u_short host_port)
1.1 deraadt 178: {
1.17 markus 179: Forward *fwd;
180: extern uid_t original_real_uid;
181: if (port < IPPORT_RESERVED && original_real_uid != 0)
182: fatal("Privileged ports can only be forwarded by root.\n");
183: if (options->num_local_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
184: fatal("Too many local forwards (max %d).", SSH_MAX_FORWARDS_PER_DIRECTION);
185: fwd = &options->local_forwards[options->num_local_forwards++];
186: fwd->port = port;
187: fwd->host = xstrdup(host);
188: fwd->host_port = host_port;
1.1 deraadt 189: }
190:
1.19 markus 191: /*
192: * Adds a remote TCP/IP port forward to options. Never returns if there is
193: * an error.
194: */
1.1 deraadt 195:
1.26 markus 196: void
1.22 markus 197: add_remote_forward(Options *options, u_short port, const char *host,
198: u_short host_port)
1.1 deraadt 199: {
1.17 markus 200: Forward *fwd;
201: if (options->num_remote_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
202: fatal("Too many remote forwards (max %d).",
203: SSH_MAX_FORWARDS_PER_DIRECTION);
204: fwd = &options->remote_forwards[options->num_remote_forwards++];
205: fwd->port = port;
206: fwd->host = xstrdup(host);
207: fwd->host_port = host_port;
1.1 deraadt 208: }
209:
1.19 markus 210: /*
211: * Returns the number of the token pointed to by cp of length len. Never
212: * returns if the token is not known.
213: */
1.1 deraadt 214:
1.26 markus 215: static OpCodes
1.17 markus 216: parse_token(const char *cp, const char *filename, int linenum)
1.1 deraadt 217: {
1.51 markus 218: u_int i;
1.1 deraadt 219:
1.17 markus 220: for (i = 0; keywords[i].name; i++)
1.20 markus 221: if (strcasecmp(cp, keywords[i].name) == 0)
1.17 markus 222: return keywords[i].opcode;
223:
224: fprintf(stderr, "%s: line %d: Bad configuration option: %s\n",
225: filename, linenum, cp);
226: return oBadOption;
1.1 deraadt 227: }
228:
1.19 markus 229: /*
230: * Processes a single option line as used in the configuration files. This
231: * only sets those values that have not already been set.
232: */
1.1 deraadt 233:
1.14 markus 234: int
235: process_config_line(Options *options, const char *host,
1.17 markus 236: char *line, const char *filename, int linenum,
237: int *activep)
1.1 deraadt 238: {
1.38 provos 239: char buf[256], *s, *string, **charptr, *endofnumber, *keyword, *arg;
1.22 markus 240: int opcode, *intptr, value;
241: u_short fwd_port, fwd_host_port;
1.1 deraadt 242:
1.42 provos 243: s = line;
244: /* Get the keyword. (Each line is supposed to begin with a keyword). */
245: keyword = strdelim(&s);
246: /* Ignore leading whitespace. */
247: if (*keyword == '\0')
1.43 markus 248: keyword = strdelim(&s);
1.56 deraadt 249: if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#')
1.17 markus 250: return 0;
251:
1.38 provos 252: opcode = parse_token(keyword, filename, linenum);
1.17 markus 253:
254: switch (opcode) {
255: case oBadOption:
1.19 markus 256: /* don't panic, but count bad options */
257: return -1;
1.17 markus 258: /* NOTREACHED */
259: case oForwardAgent:
260: intptr = &options->forward_agent;
261: parse_flag:
1.42 provos 262: arg = strdelim(&s);
1.40 ho 263: if (!arg || *arg == '\0')
1.17 markus 264: fatal("%.200s line %d: Missing yes/no argument.", filename, linenum);
265: value = 0; /* To avoid compiler warning... */
1.38 provos 266: if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
1.17 markus 267: value = 1;
1.38 provos 268: else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
1.17 markus 269: value = 0;
270: else
271: fatal("%.200s line %d: Bad yes/no argument.", filename, linenum);
272: if (*activep && *intptr == -1)
273: *intptr = value;
274: break;
275:
276: case oForwardX11:
277: intptr = &options->forward_x11;
278: goto parse_flag;
279:
280: case oGatewayPorts:
281: intptr = &options->gateway_ports;
282: goto parse_flag;
283:
284: case oUsePrivilegedPort:
285: intptr = &options->use_privileged_port;
286: goto parse_flag;
287:
288: case oRhostsAuthentication:
289: intptr = &options->rhosts_authentication;
290: goto parse_flag;
291:
292: case oPasswordAuthentication:
293: intptr = &options->password_authentication;
294: goto parse_flag;
295:
1.48 markus 296: case oKbdInteractiveAuthentication:
297: intptr = &options->kbd_interactive_authentication;
298: goto parse_flag;
299:
300: case oKbdInteractiveDevices:
301: charptr = &options->kbd_interactive_devices;
302: goto parse_string;
303:
1.50 markus 304: case oPubkeyAuthentication:
305: intptr = &options->pubkey_authentication;
1.30 markus 306: goto parse_flag;
307:
1.17 markus 308: case oRSAAuthentication:
309: intptr = &options->rsa_authentication;
310: goto parse_flag;
311:
312: case oRhostsRSAAuthentication:
313: intptr = &options->rhosts_rsa_authentication;
314: goto parse_flag;
315:
316: case oTISAuthentication:
317: /* fallthrough, there is no difference on the client side */
318: case oSkeyAuthentication:
319: intptr = &options->skey_authentication;
320: goto parse_flag;
1.16 markus 321:
1.1 deraadt 322: #ifdef KRB4
1.17 markus 323: case oKerberosAuthentication:
324: intptr = &options->kerberos_authentication;
325: goto parse_flag;
1.1 deraadt 326: #endif /* KRB4 */
327:
1.5 dugsong 328: #ifdef AFS
1.17 markus 329: case oKerberosTgtPassing:
330: intptr = &options->kerberos_tgt_passing;
331: goto parse_flag;
332:
333: case oAFSTokenPassing:
334: intptr = &options->afs_token_passing;
335: goto parse_flag;
1.1 deraadt 336: #endif
1.17 markus 337:
338: case oFallBackToRsh:
339: intptr = &options->fallback_to_rsh;
340: goto parse_flag;
341:
342: case oUseRsh:
343: intptr = &options->use_rsh;
344: goto parse_flag;
345:
346: case oBatchMode:
347: intptr = &options->batch_mode;
348: goto parse_flag;
349:
350: case oCheckHostIP:
351: intptr = &options->check_host_ip;
352: goto parse_flag;
353:
354: case oStrictHostKeyChecking:
355: intptr = &options->strict_host_key_checking;
1.42 provos 356: arg = strdelim(&s);
1.40 ho 357: if (!arg || *arg == '\0')
1.17 markus 358: fatal("%.200s line %d: Missing yes/no argument.",
359: filename, linenum);
360: value = 0; /* To avoid compiler warning... */
1.38 provos 361: if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
1.17 markus 362: value = 1;
1.38 provos 363: else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
1.17 markus 364: value = 0;
1.38 provos 365: else if (strcmp(arg, "ask") == 0)
1.17 markus 366: value = 2;
367: else
368: fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum);
369: if (*activep && *intptr == -1)
370: *intptr = value;
371: break;
372:
373: case oCompression:
374: intptr = &options->compression;
375: goto parse_flag;
376:
377: case oKeepAlives:
378: intptr = &options->keepalives;
379: goto parse_flag;
380:
381: case oNumberOfPasswordPrompts:
382: intptr = &options->number_of_password_prompts;
383: goto parse_int;
384:
385: case oCompressionLevel:
386: intptr = &options->compression_level;
387: goto parse_int;
388:
389: case oIdentityFile:
1.42 provos 390: arg = strdelim(&s);
1.40 ho 391: if (!arg || *arg == '\0')
1.17 markus 392: fatal("%.200s line %d: Missing argument.", filename, linenum);
393: if (*activep) {
1.50 markus 394: intptr = &options->num_identity_files;
1.27 markus 395: if (*intptr >= SSH_MAX_IDENTITY_FILES)
1.17 markus 396: fatal("%.200s line %d: Too many identity files specified (max %d).",
397: filename, linenum, SSH_MAX_IDENTITY_FILES);
1.50 markus 398: charptr = &options->identity_files[*intptr];
1.38 provos 399: *charptr = xstrdup(arg);
1.27 markus 400: *intptr = *intptr + 1;
1.17 markus 401: }
402: break;
403:
1.34 markus 404: case oXAuthLocation:
405: charptr=&options->xauth_location;
406: goto parse_string;
407:
1.17 markus 408: case oUser:
409: charptr = &options->user;
410: parse_string:
1.42 provos 411: arg = strdelim(&s);
1.40 ho 412: if (!arg || *arg == '\0')
1.17 markus 413: fatal("%.200s line %d: Missing argument.", filename, linenum);
414: if (*activep && *charptr == NULL)
1.38 provos 415: *charptr = xstrdup(arg);
1.17 markus 416: break;
417:
418: case oGlobalKnownHostsFile:
419: charptr = &options->system_hostfile;
420: goto parse_string;
421:
422: case oUserKnownHostsFile:
423: charptr = &options->user_hostfile;
424: goto parse_string;
425:
1.27 markus 426: case oGlobalKnownHostsFile2:
427: charptr = &options->system_hostfile2;
428: goto parse_string;
429:
430: case oUserKnownHostsFile2:
431: charptr = &options->user_hostfile2;
432: goto parse_string;
433:
1.17 markus 434: case oHostName:
435: charptr = &options->hostname;
436: goto parse_string;
437:
1.52 markus 438: case oHostKeyAlias:
439: charptr = &options->host_key_alias;
440: goto parse_string;
441:
1.17 markus 442: case oProxyCommand:
443: charptr = &options->proxy_command;
444: string = xstrdup("");
1.42 provos 445: while ((arg = strdelim(&s)) != NULL && *arg != '\0') {
1.38 provos 446: string = xrealloc(string, strlen(string) + strlen(arg) + 2);
1.17 markus 447: strcat(string, " ");
1.38 provos 448: strcat(string, arg);
1.17 markus 449: }
450: if (*activep && *charptr == NULL)
451: *charptr = string;
452: else
453: xfree(string);
454: return 0;
455:
456: case oPort:
457: intptr = &options->port;
458: parse_int:
1.42 provos 459: arg = strdelim(&s);
1.40 ho 460: if (!arg || *arg == '\0')
1.17 markus 461: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 462: if (arg[0] < '0' || arg[0] > '9')
1.17 markus 463: fatal("%.200s line %d: Bad number.", filename, linenum);
1.21 markus 464:
465: /* Octal, decimal, or hex format? */
1.38 provos 466: value = strtol(arg, &endofnumber, 0);
467: if (arg == endofnumber)
1.21 markus 468: fatal("%.200s line %d: Bad number.", filename, linenum);
1.17 markus 469: if (*activep && *intptr == -1)
470: *intptr = value;
471: break;
472:
473: case oConnectionAttempts:
474: intptr = &options->connection_attempts;
475: goto parse_int;
476:
477: case oCipher:
478: intptr = &options->cipher;
1.42 provos 479: arg = strdelim(&s);
1.40 ho 480: if (!arg || *arg == '\0')
1.32 markus 481: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 482: value = cipher_number(arg);
1.17 markus 483: if (value == -1)
484: fatal("%.200s line %d: Bad cipher '%s'.",
1.38 provos 485: filename, linenum, arg ? arg : "<NONE>");
1.17 markus 486: if (*activep && *intptr == -1)
487: *intptr = value;
488: break;
489:
1.25 markus 490: case oCiphers:
1.42 provos 491: arg = strdelim(&s);
1.40 ho 492: if (!arg || *arg == '\0')
1.32 markus 493: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 494: if (!ciphers_valid(arg))
1.31 markus 495: fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.",
1.38 provos 496: filename, linenum, arg ? arg : "<NONE>");
1.25 markus 497: if (*activep && options->ciphers == NULL)
1.38 provos 498: options->ciphers = xstrdup(arg);
1.25 markus 499: break;
500:
501: case oProtocol:
502: intptr = &options->protocol;
1.42 provos 503: arg = strdelim(&s);
1.40 ho 504: if (!arg || *arg == '\0')
1.32 markus 505: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 506: value = proto_spec(arg);
1.25 markus 507: if (value == SSH_PROTO_UNKNOWN)
508: fatal("%.200s line %d: Bad protocol spec '%s'.",
1.38 provos 509: filename, linenum, arg ? arg : "<NONE>");
1.25 markus 510: if (*activep && *intptr == SSH_PROTO_UNKNOWN)
511: *intptr = value;
512: break;
513:
1.17 markus 514: case oLogLevel:
515: intptr = (int *) &options->log_level;
1.42 provos 516: arg = strdelim(&s);
1.38 provos 517: value = log_level_number(arg);
1.17 markus 518: if (value == (LogLevel) - 1)
519: fatal("%.200s line %d: unsupported log level '%s'\n",
1.38 provos 520: filename, linenum, arg ? arg : "<NONE>");
1.17 markus 521: if (*activep && (LogLevel) * intptr == -1)
522: *intptr = (LogLevel) value;
523: break;
524:
525: case oRemoteForward:
1.42 provos 526: arg = strdelim(&s);
1.40 ho 527: if (!arg || *arg == '\0')
1.17 markus 528: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 529: if (arg[0] < '0' || arg[0] > '9')
1.17 markus 530: fatal("%.200s line %d: Badly formatted port number.",
531: filename, linenum);
1.38 provos 532: fwd_port = atoi(arg);
1.42 provos 533: arg = strdelim(&s);
1.40 ho 534: if (!arg || *arg == '\0')
1.17 markus 535: fatal("%.200s line %d: Missing second argument.",
536: filename, linenum);
1.38 provos 537: if (sscanf(arg, "%255[^:]:%hu", buf, &fwd_host_port) != 2)
1.17 markus 538: fatal("%.200s line %d: Badly formatted host:port.",
539: filename, linenum);
540: if (*activep)
541: add_remote_forward(options, fwd_port, buf, fwd_host_port);
542: break;
543:
544: case oLocalForward:
1.42 provos 545: arg = strdelim(&s);
1.40 ho 546: if (!arg || *arg == '\0')
1.17 markus 547: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 548: if (arg[0] < '0' || arg[0] > '9')
1.17 markus 549: fatal("%.200s line %d: Badly formatted port number.",
550: filename, linenum);
1.38 provos 551: fwd_port = atoi(arg);
1.42 provos 552: arg = strdelim(&s);
1.40 ho 553: if (!arg || *arg == '\0')
1.17 markus 554: fatal("%.200s line %d: Missing second argument.",
555: filename, linenum);
1.38 provos 556: if (sscanf(arg, "%255[^:]:%hu", buf, &fwd_host_port) != 2)
1.17 markus 557: fatal("%.200s line %d: Badly formatted host:port.",
558: filename, linenum);
559: if (*activep)
560: add_local_forward(options, fwd_port, buf, fwd_host_port);
561: break;
562:
563: case oHost:
564: *activep = 0;
1.42 provos 565: while ((arg = strdelim(&s)) != NULL && *arg != '\0')
1.38 provos 566: if (match_pattern(host, arg)) {
567: debug("Applying options for %.100s", arg);
1.17 markus 568: *activep = 1;
569: break;
570: }
1.42 provos 571: /* Avoid garbage check below, as strdelim is done. */
1.17 markus 572: return 0;
573:
574: case oEscapeChar:
575: intptr = &options->escape_char;
1.42 provos 576: arg = strdelim(&s);
1.40 ho 577: if (!arg || *arg == '\0')
1.17 markus 578: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 579: if (arg[0] == '^' && arg[2] == 0 &&
1.51 markus 580: (u_char) arg[1] >= 64 && (u_char) arg[1] < 128)
581: value = (u_char) arg[1] & 31;
1.38 provos 582: else if (strlen(arg) == 1)
1.51 markus 583: value = (u_char) arg[0];
1.38 provos 584: else if (strcmp(arg, "none") == 0)
1.17 markus 585: value = -2;
586: else {
587: fatal("%.200s line %d: Bad escape character.",
588: filename, linenum);
589: /* NOTREACHED */
590: value = 0; /* Avoid compiler warning. */
591: }
592: if (*activep && *intptr == -1)
593: *intptr = value;
594: break;
595:
596: default:
597: fatal("process_config_line: Unimplemented opcode %d", opcode);
598: }
599:
600: /* Check that there is no garbage at end of line. */
1.57 ! djm 601: if ((arg = strdelim(&s)) != NULL && *arg != '\0') {
1.39 ho 602: fatal("%.200s line %d: garbage at end of line; \"%.200s\".",
603: filename, linenum, arg);
604: }
1.17 markus 605: return 0;
1.1 deraadt 606: }
607:
608:
1.19 markus 609: /*
610: * Reads the config file and modifies the options accordingly. Options
611: * should already be initialized before this call. This never returns if
612: * there is an error. If the file does not exist, this returns immediately.
613: */
1.1 deraadt 614:
1.26 markus 615: void
1.17 markus 616: read_config_file(const char *filename, const char *host, Options *options)
1.1 deraadt 617: {
1.17 markus 618: FILE *f;
619: char line[1024];
620: int active, linenum;
621: int bad_options = 0;
622:
623: /* Open the file. */
624: f = fopen(filename, "r");
625: if (!f)
626: return;
627:
628: debug("Reading configuration data %.200s", filename);
629:
1.19 markus 630: /*
631: * Mark that we are now processing the options. This flag is turned
632: * on/off by Host specifications.
633: */
1.17 markus 634: active = 1;
635: linenum = 0;
636: while (fgets(line, sizeof(line), f)) {
637: /* Update line number counter. */
638: linenum++;
639: if (process_config_line(options, host, line, filename, linenum, &active) != 0)
640: bad_options++;
641: }
642: fclose(f);
643: if (bad_options > 0)
644: fatal("%s: terminating, %d bad configuration options\n",
645: filename, bad_options);
1.1 deraadt 646: }
647:
1.19 markus 648: /*
649: * Initializes options to special values that indicate that they have not yet
650: * been set. Read_config_file will only set options with this value. Options
651: * are processed in the following order: command line, user config file,
652: * system config file. Last, fill_default_options is called.
653: */
1.1 deraadt 654:
1.26 markus 655: void
1.17 markus 656: initialize_options(Options * options)
1.1 deraadt 657: {
1.17 markus 658: memset(options, 'X', sizeof(*options));
659: options->forward_agent = -1;
660: options->forward_x11 = -1;
1.34 markus 661: options->xauth_location = NULL;
1.17 markus 662: options->gateway_ports = -1;
663: options->use_privileged_port = -1;
664: options->rhosts_authentication = -1;
665: options->rsa_authentication = -1;
1.50 markus 666: options->pubkey_authentication = -1;
1.17 markus 667: options->skey_authentication = -1;
1.1 deraadt 668: #ifdef KRB4
1.17 markus 669: options->kerberos_authentication = -1;
1.1 deraadt 670: #endif
1.5 dugsong 671: #ifdef AFS
1.17 markus 672: options->kerberos_tgt_passing = -1;
673: options->afs_token_passing = -1;
1.1 deraadt 674: #endif
1.17 markus 675: options->password_authentication = -1;
1.48 markus 676: options->kbd_interactive_authentication = -1;
677: options->kbd_interactive_devices = NULL;
1.17 markus 678: options->rhosts_rsa_authentication = -1;
679: options->fallback_to_rsh = -1;
680: options->use_rsh = -1;
681: options->batch_mode = -1;
682: options->check_host_ip = -1;
683: options->strict_host_key_checking = -1;
684: options->compression = -1;
685: options->keepalives = -1;
686: options->compression_level = -1;
687: options->port = -1;
688: options->connection_attempts = -1;
689: options->number_of_password_prompts = -1;
690: options->cipher = -1;
1.25 markus 691: options->ciphers = NULL;
692: options->protocol = SSH_PROTO_UNKNOWN;
1.17 markus 693: options->num_identity_files = 0;
694: options->hostname = NULL;
1.52 markus 695: options->host_key_alias = NULL;
1.17 markus 696: options->proxy_command = NULL;
697: options->user = NULL;
698: options->escape_char = -1;
699: options->system_hostfile = NULL;
700: options->user_hostfile = NULL;
1.27 markus 701: options->system_hostfile2 = NULL;
702: options->user_hostfile2 = NULL;
1.17 markus 703: options->num_local_forwards = 0;
704: options->num_remote_forwards = 0;
705: options->log_level = (LogLevel) - 1;
1.1 deraadt 706: }
707:
1.19 markus 708: /*
709: * Called after processing other sources of option data, this fills those
710: * options for which no value has been specified with their default values.
711: */
1.1 deraadt 712:
1.26 markus 713: void
1.17 markus 714: fill_default_options(Options * options)
1.1 deraadt 715: {
1.17 markus 716: if (options->forward_agent == -1)
1.33 markus 717: options->forward_agent = 0;
1.17 markus 718: if (options->forward_x11 == -1)
1.23 markus 719: options->forward_x11 = 0;
1.34 markus 720: #ifdef XAUTH_PATH
721: if (options->xauth_location == NULL)
1.35 markus 722: options->xauth_location = XAUTH_PATH;
1.34 markus 723: #endif /* XAUTH_PATH */
1.17 markus 724: if (options->gateway_ports == -1)
725: options->gateway_ports = 0;
726: if (options->use_privileged_port == -1)
727: options->use_privileged_port = 1;
728: if (options->rhosts_authentication == -1)
729: options->rhosts_authentication = 1;
730: if (options->rsa_authentication == -1)
731: options->rsa_authentication = 1;
1.50 markus 732: if (options->pubkey_authentication == -1)
733: options->pubkey_authentication = 1;
1.17 markus 734: if (options->skey_authentication == -1)
735: options->skey_authentication = 0;
1.1 deraadt 736: #ifdef KRB4
1.17 markus 737: if (options->kerberos_authentication == -1)
1.45 provos 738: options->kerberos_authentication = 1;
1.5 dugsong 739: #endif /* KRB4 */
740: #ifdef AFS
1.17 markus 741: if (options->kerberos_tgt_passing == -1)
742: options->kerberos_tgt_passing = 1;
743: if (options->afs_token_passing == -1)
744: options->afs_token_passing = 1;
1.5 dugsong 745: #endif /* AFS */
1.17 markus 746: if (options->password_authentication == -1)
747: options->password_authentication = 1;
1.48 markus 748: if (options->kbd_interactive_authentication == -1)
749: options->kbd_interactive_authentication = 0;
1.17 markus 750: if (options->rhosts_rsa_authentication == -1)
751: options->rhosts_rsa_authentication = 1;
752: if (options->fallback_to_rsh == -1)
1.41 deraadt 753: options->fallback_to_rsh = 0;
1.17 markus 754: if (options->use_rsh == -1)
755: options->use_rsh = 0;
756: if (options->batch_mode == -1)
757: options->batch_mode = 0;
758: if (options->check_host_ip == -1)
759: options->check_host_ip = 1;
760: if (options->strict_host_key_checking == -1)
761: options->strict_host_key_checking = 2; /* 2 is default */
762: if (options->compression == -1)
763: options->compression = 0;
764: if (options->keepalives == -1)
765: options->keepalives = 1;
766: if (options->compression_level == -1)
767: options->compression_level = 6;
768: if (options->port == -1)
769: options->port = 0; /* Filled in ssh_connect. */
770: if (options->connection_attempts == -1)
771: options->connection_attempts = 4;
772: if (options->number_of_password_prompts == -1)
773: options->number_of_password_prompts = 3;
774: /* Selected in ssh_login(). */
775: if (options->cipher == -1)
776: options->cipher = SSH_CIPHER_NOT_SET;
1.31 markus 777: /* options->ciphers, default set in myproposals.h */
1.25 markus 778: if (options->protocol == SSH_PROTO_UNKNOWN)
1.28 markus 779: options->protocol = SSH_PROTO_1|SSH_PROTO_2|SSH_PROTO_1_PREFERRED;
1.17 markus 780: if (options->num_identity_files == 0) {
1.50 markus 781: if (options->protocol & SSH_PROTO_1) {
782: options->identity_files[options->num_identity_files] =
1.55 markus 783: xmalloc(2 + strlen(_PATH_SSH_CLIENT_IDENTITY) + 1);
1.50 markus 784: sprintf(options->identity_files[options->num_identity_files++],
1.55 markus 785: "~/%.100s", _PATH_SSH_CLIENT_IDENTITY);
1.50 markus 786: }
787: if (options->protocol & SSH_PROTO_2) {
788: options->identity_files[options->num_identity_files] =
1.55 markus 789: xmalloc(2 + strlen(_PATH_SSH_CLIENT_ID_DSA) + 1);
1.50 markus 790: sprintf(options->identity_files[options->num_identity_files++],
1.55 markus 791: "~/%.100s", _PATH_SSH_CLIENT_ID_DSA);
1.50 markus 792: }
1.27 markus 793: }
1.17 markus 794: if (options->escape_char == -1)
795: options->escape_char = '~';
796: if (options->system_hostfile == NULL)
1.55 markus 797: options->system_hostfile = _PATH_SSH_SYSTEM_HOSTFILE;
1.17 markus 798: if (options->user_hostfile == NULL)
1.55 markus 799: options->user_hostfile = _PATH_SSH_USER_HOSTFILE;
1.27 markus 800: if (options->system_hostfile2 == NULL)
1.55 markus 801: options->system_hostfile2 = _PATH_SSH_SYSTEM_HOSTFILE2;
1.27 markus 802: if (options->user_hostfile2 == NULL)
1.55 markus 803: options->user_hostfile2 = _PATH_SSH_USER_HOSTFILE2;
1.17 markus 804: if (options->log_level == (LogLevel) - 1)
1.54 markus 805: options->log_level = SYSLOG_LEVEL_INFO;
1.17 markus 806: /* options->proxy_command should not be set by default */
807: /* options->user will be set in the main program if appropriate */
808: /* options->hostname will be set in the main program if appropriate */
1.52 markus 809: /* options->host_key_alias should not be set by default */
1.1 deraadt 810: }
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