Annotation of src/usr.bin/ssh/readconf.c, Revision 1.120
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"
1.120 ! markus 15: RCSID("$OpenBSD: readconf.c,v 1.119 2003/08/28 12:54:34 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
1.96 markus 44: User foo
1.1 deraadt 45:
46: Host fake.com
47: HostName another.host.name.real.org
48: User blaah
49: Port 34289
50: ForwardX11 no
51: ForwardAgent no
52:
53: Host books.com
54: RemoteForward 9999 shadows.cs.hut.fi:9999
55: Cipher 3des
56:
57: Host fascist.blob.com
58: Port 23123
59: User tylonen
60: PasswordAuthentication no
61:
62: Host puukko.hut.fi
63: User t35124p
64: ProxyCommand ssh-proxy %h %p
65:
66: Host *.fr
1.96 markus 67: PublicKeyAuthentication no
1.1 deraadt 68:
69: Host *.su
70: Cipher none
71: PasswordAuthentication no
72:
73: # Defaults for various options
74: Host *
75: ForwardAgent no
1.50 markus 76: ForwardX11 no
1.1 deraadt 77: PasswordAuthentication yes
78: RSAAuthentication yes
79: RhostsRSAAuthentication yes
80: StrictHostKeyChecking yes
81: KeepAlives no
82: IdentityFile ~/.ssh/identity
83: Port 22
84: EscapeChar ~
85:
86: */
87:
88: /* Keyword tokens. */
89:
1.17 markus 90: typedef enum {
91: oBadOption,
1.116 markus 92: oForwardAgent, oForwardX11, oGatewayPorts,
1.100 deraadt 93: oPasswordAuthentication, oRSAAuthentication,
1.59 markus 94: oChallengeResponseAuthentication, oXAuthLocation,
1.115 markus 95: oKerberosAuthentication, oKerberosTgtPassing,
1.17 markus 96: oIdentityFile, oHostName, oPort, oCipher, oRemoteForward, oLocalForward,
97: oUser, oHost, oEscapeChar, oRhostsRSAAuthentication, oProxyCommand,
98: oGlobalKnownHostsFile, oUserKnownHostsFile, oConnectionAttempts,
99: oBatchMode, oCheckHostIP, oStrictHostKeyChecking, oCompression,
1.59 markus 100: oCompressionLevel, oKeepAlives, oNumberOfPasswordPrompts,
1.62 markus 101: oUsePrivilegedPort, oLogLevel, oCiphers, oProtocol, oMacs,
1.50 markus 102: oGlobalKnownHostsFile2, oUserKnownHostsFile2, oPubkeyAuthentication,
1.67 markus 103: oKbdInteractiveAuthentication, oKbdInteractiveDevices, oHostKeyAlias,
1.76 markus 104: oDynamicForward, oPreferredAuthentications, oHostbasedAuthentication,
1.90 stevesk 105: oHostKeyAlgorithms, oBindAddress, oSmartcardDevice,
1.96 markus 106: oClearAllForwardings, oNoHostAuthenticationForLocalhost,
1.111 djm 107: oEnableSSHKeysign, oRekeyLimit, oVerifyHostKeyDNS, oConnectTimeout,
1.118 markus 108: oAddressFamily, oGssAuthentication, oGssDelegateCreds,
1.110 jakob 109: oDeprecated, oUnsupported
1.1 deraadt 110: } OpCodes;
111:
112: /* Textual representations of the tokens. */
113:
1.17 markus 114: static struct {
115: const char *name;
116: OpCodes opcode;
117: } keywords[] = {
118: { "forwardagent", oForwardAgent },
119: { "forwardx11", oForwardX11 },
1.34 markus 120: { "xauthlocation", oXAuthLocation },
1.17 markus 121: { "gatewayports", oGatewayPorts },
122: { "useprivilegedport", oUsePrivilegedPort },
1.116 markus 123: { "rhostsauthentication", oDeprecated },
1.17 markus 124: { "passwordauthentication", oPasswordAuthentication },
1.48 markus 125: { "kbdinteractiveauthentication", oKbdInteractiveAuthentication },
126: { "kbdinteractivedevices", oKbdInteractiveDevices },
1.17 markus 127: { "rsaauthentication", oRSAAuthentication },
1.50 markus 128: { "pubkeyauthentication", oPubkeyAuthentication },
1.59 markus 129: { "dsaauthentication", oPubkeyAuthentication }, /* alias */
1.72 markus 130: { "rhostsrsaauthentication", oRhostsRSAAuthentication },
1.73 markus 131: { "hostbasedauthentication", oHostbasedAuthentication },
1.59 markus 132: { "challengeresponseauthentication", oChallengeResponseAuthentication },
133: { "skeyauthentication", oChallengeResponseAuthentication }, /* alias */
134: { "tisauthentication", oChallengeResponseAuthentication }, /* alias */
1.110 jakob 135: { "kerberosauthentication", oUnsupported },
136: { "kerberostgtpassing", oUnsupported },
137: { "afstokenpassing", oUnsupported },
1.118 markus 138: #if defined(GSSAPI)
139: { "gssapiauthentication", oGssAuthentication },
140: { "gssapidelegatecredentials", oGssDelegateCreds },
141: #else
142: { "gssapiauthentication", oUnsupported },
143: { "gssapidelegatecredentials", oUnsupported },
144: #endif
1.96 markus 145: { "fallbacktorsh", oDeprecated },
146: { "usersh", oDeprecated },
1.17 markus 147: { "identityfile", oIdentityFile },
1.50 markus 148: { "identityfile2", oIdentityFile }, /* alias */
1.17 markus 149: { "hostname", oHostName },
1.52 markus 150: { "hostkeyalias", oHostKeyAlias },
1.17 markus 151: { "proxycommand", oProxyCommand },
152: { "port", oPort },
153: { "cipher", oCipher },
1.25 markus 154: { "ciphers", oCiphers },
1.62 markus 155: { "macs", oMacs },
1.25 markus 156: { "protocol", oProtocol },
1.17 markus 157: { "remoteforward", oRemoteForward },
158: { "localforward", oLocalForward },
159: { "user", oUser },
160: { "host", oHost },
161: { "escapechar", oEscapeChar },
162: { "globalknownhostsfile", oGlobalKnownHostsFile },
1.81 markus 163: { "userknownhostsfile", oUserKnownHostsFile }, /* obsolete */
1.27 markus 164: { "globalknownhostsfile2", oGlobalKnownHostsFile2 },
1.81 markus 165: { "userknownhostsfile2", oUserKnownHostsFile2 }, /* obsolete */
1.17 markus 166: { "connectionattempts", oConnectionAttempts },
167: { "batchmode", oBatchMode },
168: { "checkhostip", oCheckHostIP },
169: { "stricthostkeychecking", oStrictHostKeyChecking },
170: { "compression", oCompression },
171: { "compressionlevel", oCompressionLevel },
172: { "keepalive", oKeepAlives },
173: { "numberofpasswordprompts", oNumberOfPasswordPrompts },
174: { "loglevel", oLogLevel },
1.71 markus 175: { "dynamicforward", oDynamicForward },
1.67 markus 176: { "preferredauthentications", oPreferredAuthentications },
1.76 markus 177: { "hostkeyalgorithms", oHostKeyAlgorithms },
1.77 markus 178: { "bindaddress", oBindAddress },
1.110 jakob 179: #ifdef SMARTCARD
1.85 jakob 180: { "smartcarddevice", oSmartcardDevice },
1.110 jakob 181: #else
182: { "smartcarddevice", oUnsupported },
183: #endif
1.93 deraadt 184: { "clearallforwardings", oClearAllForwardings },
1.101 markus 185: { "enablesshkeysign", oEnableSSHKeysign },
1.110 jakob 186: #ifdef DNS
1.107 jakob 187: { "verifyhostkeydns", oVerifyHostKeyDNS },
1.110 jakob 188: #else
189: { "verifyhostkeydns", oUnsupported },
190: #endif
1.93 deraadt 191: { "nohostauthenticationforlocalhost", oNoHostAuthenticationForLocalhost },
1.105 markus 192: { "rekeylimit", oRekeyLimit },
1.111 djm 193: { "connecttimeout", oConnectTimeout },
1.112 djm 194: { "addressfamily", oAddressFamily },
1.92 stevesk 195: { NULL, oBadOption }
1.13 markus 196: };
197:
1.19 markus 198: /*
199: * Adds a local TCP/IP port forward to options. Never returns if there is an
200: * error.
201: */
1.1 deraadt 202:
1.26 markus 203: void
1.22 markus 204: add_local_forward(Options *options, u_short port, const char *host,
205: u_short host_port)
1.1 deraadt 206: {
1.17 markus 207: Forward *fwd;
208: extern uid_t original_real_uid;
209: if (port < IPPORT_RESERVED && original_real_uid != 0)
1.64 millert 210: fatal("Privileged ports can only be forwarded by root.");
1.17 markus 211: if (options->num_local_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
212: fatal("Too many local forwards (max %d).", SSH_MAX_FORWARDS_PER_DIRECTION);
213: fwd = &options->local_forwards[options->num_local_forwards++];
214: fwd->port = port;
215: fwd->host = xstrdup(host);
216: fwd->host_port = host_port;
1.1 deraadt 217: }
218:
1.19 markus 219: /*
220: * Adds a remote TCP/IP port forward to options. Never returns if there is
221: * an error.
222: */
1.1 deraadt 223:
1.26 markus 224: void
1.22 markus 225: add_remote_forward(Options *options, u_short port, const char *host,
226: u_short host_port)
1.1 deraadt 227: {
1.17 markus 228: Forward *fwd;
229: if (options->num_remote_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
230: fatal("Too many remote forwards (max %d).",
1.93 deraadt 231: SSH_MAX_FORWARDS_PER_DIRECTION);
1.17 markus 232: fwd = &options->remote_forwards[options->num_remote_forwards++];
233: fwd->port = port;
234: fwd->host = xstrdup(host);
235: fwd->host_port = host_port;
1.1 deraadt 236: }
237:
1.90 stevesk 238: static void
239: clear_forwardings(Options *options)
240: {
241: int i;
242:
243: for (i = 0; i < options->num_local_forwards; i++)
244: xfree(options->local_forwards[i].host);
245: options->num_local_forwards = 0;
246: for (i = 0; i < options->num_remote_forwards; i++)
247: xfree(options->remote_forwards[i].host);
248: options->num_remote_forwards = 0;
249: }
250:
1.19 markus 251: /*
1.70 stevesk 252: * Returns the number of the token pointed to by cp or oBadOption.
1.19 markus 253: */
1.1 deraadt 254:
1.26 markus 255: static OpCodes
1.17 markus 256: parse_token(const char *cp, const char *filename, int linenum)
1.1 deraadt 257: {
1.51 markus 258: u_int i;
1.1 deraadt 259:
1.17 markus 260: for (i = 0; keywords[i].name; i++)
1.20 markus 261: if (strcasecmp(cp, keywords[i].name) == 0)
1.17 markus 262: return keywords[i].opcode;
263:
1.75 stevesk 264: error("%s: line %d: Bad configuration option: %s",
265: filename, linenum, cp);
1.17 markus 266: return oBadOption;
1.1 deraadt 267: }
268:
1.19 markus 269: /*
270: * Processes a single option line as used in the configuration files. This
271: * only sets those values that have not already been set.
272: */
1.102 markus 273: #define WHITESPACE " \t\r\n"
1.1 deraadt 274:
1.14 markus 275: int
276: process_config_line(Options *options, const char *host,
1.17 markus 277: char *line, const char *filename, int linenum,
278: int *activep)
1.1 deraadt 279: {
1.102 markus 280: char buf[256], *s, **charptr, *endofnumber, *keyword, *arg;
1.22 markus 281: int opcode, *intptr, value;
1.102 markus 282: size_t len;
1.22 markus 283: u_short fwd_port, fwd_host_port;
1.88 stevesk 284: char sfwd_host_port[6];
1.106 djm 285:
286: /* Strip trailing whitespace */
287: for(len = strlen(line) - 1; len > 0; len--) {
288: if (strchr(WHITESPACE, line[len]) == NULL)
289: break;
290: line[len] = '\0';
291: }
1.1 deraadt 292:
1.42 provos 293: s = line;
294: /* Get the keyword. (Each line is supposed to begin with a keyword). */
295: keyword = strdelim(&s);
296: /* Ignore leading whitespace. */
297: if (*keyword == '\0')
1.43 markus 298: keyword = strdelim(&s);
1.56 deraadt 299: if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#')
1.17 markus 300: return 0;
301:
1.38 provos 302: opcode = parse_token(keyword, filename, linenum);
1.17 markus 303:
304: switch (opcode) {
305: case oBadOption:
1.19 markus 306: /* don't panic, but count bad options */
307: return -1;
1.17 markus 308: /* NOTREACHED */
1.111 djm 309: case oConnectTimeout:
310: intptr = &options->connection_timeout;
311: /* parse_time: */
312: arg = strdelim(&s);
313: if (!arg || *arg == '\0')
314: fatal("%s line %d: missing time value.",
315: filename, linenum);
316: if ((value = convtime(arg)) == -1)
317: fatal("%s line %d: invalid time value.",
318: filename, linenum);
319: if (*intptr == -1)
320: *intptr = value;
321: break;
322:
1.17 markus 323: case oForwardAgent:
324: intptr = &options->forward_agent;
325: parse_flag:
1.42 provos 326: arg = strdelim(&s);
1.40 ho 327: if (!arg || *arg == '\0')
1.17 markus 328: fatal("%.200s line %d: Missing yes/no argument.", filename, linenum);
329: value = 0; /* To avoid compiler warning... */
1.38 provos 330: if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
1.17 markus 331: value = 1;
1.38 provos 332: else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
1.17 markus 333: value = 0;
334: else
335: fatal("%.200s line %d: Bad yes/no argument.", filename, linenum);
336: if (*activep && *intptr == -1)
337: *intptr = value;
338: break;
339:
340: case oForwardX11:
341: intptr = &options->forward_x11;
342: goto parse_flag;
343:
344: case oGatewayPorts:
345: intptr = &options->gateway_ports;
346: goto parse_flag;
347:
348: case oUsePrivilegedPort:
349: intptr = &options->use_privileged_port;
350: goto parse_flag;
351:
352: case oPasswordAuthentication:
353: intptr = &options->password_authentication;
354: goto parse_flag;
355:
1.48 markus 356: case oKbdInteractiveAuthentication:
357: intptr = &options->kbd_interactive_authentication;
358: goto parse_flag;
359:
360: case oKbdInteractiveDevices:
361: charptr = &options->kbd_interactive_devices;
362: goto parse_string;
363:
1.50 markus 364: case oPubkeyAuthentication:
365: intptr = &options->pubkey_authentication;
1.30 markus 366: goto parse_flag;
367:
1.17 markus 368: case oRSAAuthentication:
369: intptr = &options->rsa_authentication;
370: goto parse_flag;
371:
372: case oRhostsRSAAuthentication:
373: intptr = &options->rhosts_rsa_authentication;
374: goto parse_flag;
375:
1.72 markus 376: case oHostbasedAuthentication:
377: intptr = &options->hostbased_authentication;
378: goto parse_flag;
379:
1.59 markus 380: case oChallengeResponseAuthentication:
1.78 markus 381: intptr = &options->challenge_response_authentication;
1.17 markus 382: goto parse_flag;
1.108 jakob 383:
1.17 markus 384: case oKerberosAuthentication:
385: intptr = &options->kerberos_authentication;
386: goto parse_flag;
1.108 jakob 387:
1.17 markus 388: case oKerberosTgtPassing:
389: intptr = &options->kerberos_tgt_passing;
390: goto parse_flag;
1.108 jakob 391:
1.118 markus 392: case oGssAuthentication:
393: intptr = &options->gss_authentication;
394: goto parse_flag;
395:
396: case oGssDelegateCreds:
397: intptr = &options->gss_deleg_creds;
398: goto parse_flag;
399:
1.17 markus 400: case oBatchMode:
401: intptr = &options->batch_mode;
402: goto parse_flag;
403:
404: case oCheckHostIP:
405: intptr = &options->check_host_ip;
406: goto parse_flag;
407:
1.107 jakob 408: case oVerifyHostKeyDNS:
409: intptr = &options->verify_host_key_dns;
410: goto parse_flag;
411:
1.17 markus 412: case oStrictHostKeyChecking:
413: intptr = &options->strict_host_key_checking;
1.42 provos 414: arg = strdelim(&s);
1.40 ho 415: if (!arg || *arg == '\0')
1.60 stevesk 416: fatal("%.200s line %d: Missing yes/no/ask argument.",
1.93 deraadt 417: filename, linenum);
1.17 markus 418: value = 0; /* To avoid compiler warning... */
1.38 provos 419: if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
1.17 markus 420: value = 1;
1.38 provos 421: else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
1.17 markus 422: value = 0;
1.38 provos 423: else if (strcmp(arg, "ask") == 0)
1.17 markus 424: value = 2;
425: else
426: fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum);
427: if (*activep && *intptr == -1)
428: *intptr = value;
429: break;
430:
431: case oCompression:
432: intptr = &options->compression;
433: goto parse_flag;
434:
435: case oKeepAlives:
436: intptr = &options->keepalives;
437: goto parse_flag;
438:
1.91 markus 439: case oNoHostAuthenticationForLocalhost:
440: intptr = &options->no_host_authentication_for_localhost;
441: goto parse_flag;
442:
1.17 markus 443: case oNumberOfPasswordPrompts:
444: intptr = &options->number_of_password_prompts;
445: goto parse_int;
446:
447: case oCompressionLevel:
448: intptr = &options->compression_level;
449: goto parse_int;
450:
1.105 markus 451: case oRekeyLimit:
452: intptr = &options->rekey_limit;
453: arg = strdelim(&s);
454: if (!arg || *arg == '\0')
455: fatal("%.200s line %d: Missing argument.", filename, linenum);
456: if (arg[0] < '0' || arg[0] > '9')
457: fatal("%.200s line %d: Bad number.", filename, linenum);
458: value = strtol(arg, &endofnumber, 10);
459: if (arg == endofnumber)
460: fatal("%.200s line %d: Bad number.", filename, linenum);
461: switch (toupper(*endofnumber)) {
462: case 'K':
463: value *= 1<<10;
464: break;
465: case 'M':
466: value *= 1<<20;
467: break;
468: case 'G':
469: value *= 1<<30;
470: break;
471: }
472: if (*activep && *intptr == -1)
473: *intptr = value;
474: break;
475:
1.17 markus 476: case oIdentityFile:
1.42 provos 477: arg = strdelim(&s);
1.40 ho 478: if (!arg || *arg == '\0')
1.17 markus 479: fatal("%.200s line %d: Missing argument.", filename, linenum);
480: if (*activep) {
1.50 markus 481: intptr = &options->num_identity_files;
1.27 markus 482: if (*intptr >= SSH_MAX_IDENTITY_FILES)
1.17 markus 483: fatal("%.200s line %d: Too many identity files specified (max %d).",
1.93 deraadt 484: filename, linenum, SSH_MAX_IDENTITY_FILES);
1.50 markus 485: charptr = &options->identity_files[*intptr];
1.38 provos 486: *charptr = xstrdup(arg);
1.27 markus 487: *intptr = *intptr + 1;
1.17 markus 488: }
489: break;
490:
1.34 markus 491: case oXAuthLocation:
492: charptr=&options->xauth_location;
493: goto parse_string;
494:
1.17 markus 495: case oUser:
496: charptr = &options->user;
497: parse_string:
1.42 provos 498: arg = strdelim(&s);
1.40 ho 499: if (!arg || *arg == '\0')
1.17 markus 500: fatal("%.200s line %d: Missing argument.", filename, linenum);
501: if (*activep && *charptr == NULL)
1.38 provos 502: *charptr = xstrdup(arg);
1.17 markus 503: break;
504:
505: case oGlobalKnownHostsFile:
506: charptr = &options->system_hostfile;
507: goto parse_string;
508:
509: case oUserKnownHostsFile:
510: charptr = &options->user_hostfile;
511: goto parse_string;
512:
1.27 markus 513: case oGlobalKnownHostsFile2:
514: charptr = &options->system_hostfile2;
515: goto parse_string;
516:
517: case oUserKnownHostsFile2:
518: charptr = &options->user_hostfile2;
519: goto parse_string;
520:
1.17 markus 521: case oHostName:
522: charptr = &options->hostname;
523: goto parse_string;
524:
1.52 markus 525: case oHostKeyAlias:
526: charptr = &options->host_key_alias;
527: goto parse_string;
528:
1.67 markus 529: case oPreferredAuthentications:
530: charptr = &options->preferred_authentications;
531: goto parse_string;
532:
1.77 markus 533: case oBindAddress:
534: charptr = &options->bind_address;
535: goto parse_string;
536:
1.85 jakob 537: case oSmartcardDevice:
1.86 markus 538: charptr = &options->smartcard_device;
539: goto parse_string;
1.85 jakob 540:
1.17 markus 541: case oProxyCommand:
1.113 markus 542: if (s == NULL)
543: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.17 markus 544: charptr = &options->proxy_command;
1.102 markus 545: len = strspn(s, WHITESPACE "=");
1.17 markus 546: if (*activep && *charptr == NULL)
1.102 markus 547: *charptr = xstrdup(s + len);
1.17 markus 548: return 0;
549:
550: case oPort:
551: intptr = &options->port;
552: parse_int:
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);
1.38 provos 556: if (arg[0] < '0' || arg[0] > '9')
1.17 markus 557: fatal("%.200s line %d: Bad number.", filename, linenum);
1.21 markus 558:
559: /* Octal, decimal, or hex format? */
1.38 provos 560: value = strtol(arg, &endofnumber, 0);
561: if (arg == endofnumber)
1.21 markus 562: fatal("%.200s line %d: Bad number.", filename, linenum);
1.17 markus 563: if (*activep && *intptr == -1)
564: *intptr = value;
565: break;
566:
567: case oConnectionAttempts:
568: intptr = &options->connection_attempts;
569: goto parse_int;
570:
571: case oCipher:
572: intptr = &options->cipher;
1.42 provos 573: arg = strdelim(&s);
1.40 ho 574: if (!arg || *arg == '\0')
1.32 markus 575: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 576: value = cipher_number(arg);
1.17 markus 577: if (value == -1)
578: fatal("%.200s line %d: Bad cipher '%s'.",
1.93 deraadt 579: filename, linenum, arg ? arg : "<NONE>");
1.17 markus 580: if (*activep && *intptr == -1)
581: *intptr = value;
582: break;
583:
1.25 markus 584: case oCiphers:
1.42 provos 585: arg = strdelim(&s);
1.40 ho 586: if (!arg || *arg == '\0')
1.32 markus 587: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 588: if (!ciphers_valid(arg))
1.31 markus 589: fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.",
1.93 deraadt 590: filename, linenum, arg ? arg : "<NONE>");
1.25 markus 591: if (*activep && options->ciphers == NULL)
1.38 provos 592: options->ciphers = xstrdup(arg);
1.25 markus 593: break;
594:
1.62 markus 595: case oMacs:
596: arg = strdelim(&s);
597: if (!arg || *arg == '\0')
598: fatal("%.200s line %d: Missing argument.", filename, linenum);
599: if (!mac_valid(arg))
600: fatal("%.200s line %d: Bad SSH2 Mac spec '%s'.",
1.93 deraadt 601: filename, linenum, arg ? arg : "<NONE>");
1.62 markus 602: if (*activep && options->macs == NULL)
603: options->macs = xstrdup(arg);
604: break;
605:
1.76 markus 606: case oHostKeyAlgorithms:
607: arg = strdelim(&s);
608: if (!arg || *arg == '\0')
609: fatal("%.200s line %d: Missing argument.", filename, linenum);
610: if (!key_names_valid2(arg))
611: fatal("%.200s line %d: Bad protocol 2 host key algorithms '%s'.",
1.93 deraadt 612: filename, linenum, arg ? arg : "<NONE>");
1.76 markus 613: if (*activep && options->hostkeyalgorithms == NULL)
614: options->hostkeyalgorithms = xstrdup(arg);
615: break;
616:
1.25 markus 617: case oProtocol:
618: intptr = &options->protocol;
1.42 provos 619: arg = strdelim(&s);
1.40 ho 620: if (!arg || *arg == '\0')
1.32 markus 621: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 622: value = proto_spec(arg);
1.25 markus 623: if (value == SSH_PROTO_UNKNOWN)
624: fatal("%.200s line %d: Bad protocol spec '%s'.",
1.93 deraadt 625: filename, linenum, arg ? arg : "<NONE>");
1.25 markus 626: if (*activep && *intptr == SSH_PROTO_UNKNOWN)
627: *intptr = value;
628: break;
629:
1.17 markus 630: case oLogLevel:
631: intptr = (int *) &options->log_level;
1.42 provos 632: arg = strdelim(&s);
1.38 provos 633: value = log_level_number(arg);
1.95 markus 634: if (value == SYSLOG_LEVEL_NOT_SET)
1.64 millert 635: fatal("%.200s line %d: unsupported log level '%s'",
1.93 deraadt 636: filename, linenum, arg ? arg : "<NONE>");
1.95 markus 637: if (*activep && (LogLevel) *intptr == SYSLOG_LEVEL_NOT_SET)
1.17 markus 638: *intptr = (LogLevel) value;
639: break;
640:
1.88 stevesk 641: case oLocalForward:
1.17 markus 642: case oRemoteForward:
1.42 provos 643: arg = strdelim(&s);
1.40 ho 644: if (!arg || *arg == '\0')
1.88 stevesk 645: fatal("%.200s line %d: Missing port argument.",
646: filename, linenum);
647: if ((fwd_port = a2port(arg)) == 0)
648: fatal("%.200s line %d: Bad listen port.",
649: filename, linenum);
1.42 provos 650: arg = strdelim(&s);
1.40 ho 651: if (!arg || *arg == '\0')
1.17 markus 652: fatal("%.200s line %d: Missing second argument.",
1.88 stevesk 653: filename, linenum);
654: if (sscanf(arg, "%255[^:]:%5[0-9]", buf, sfwd_host_port) != 2 &&
655: sscanf(arg, "%255[^/]/%5[0-9]", buf, sfwd_host_port) != 2)
656: fatal("%.200s line %d: Bad forwarding specification.",
657: filename, linenum);
658: if ((fwd_host_port = a2port(sfwd_host_port)) == 0)
659: fatal("%.200s line %d: Bad forwarding port.",
660: filename, linenum);
661: if (*activep) {
662: if (opcode == oLocalForward)
663: add_local_forward(options, fwd_port, buf,
664: fwd_host_port);
665: else if (opcode == oRemoteForward)
666: add_remote_forward(options, fwd_port, buf,
667: fwd_host_port);
668: }
1.17 markus 669: break;
1.71 markus 670:
671: case oDynamicForward:
672: arg = strdelim(&s);
673: if (!arg || *arg == '\0')
674: fatal("%.200s line %d: Missing port argument.",
675: filename, linenum);
1.74 stevesk 676: fwd_port = a2port(arg);
677: if (fwd_port == 0)
1.71 markus 678: fatal("%.200s line %d: Badly formatted port number.",
679: filename, linenum);
1.87 markus 680: if (*activep)
1.117 markus 681: add_local_forward(options, fwd_port, "socks", 0);
1.72 markus 682: break;
1.17 markus 683:
1.90 stevesk 684: case oClearAllForwardings:
685: intptr = &options->clear_forwardings;
686: goto parse_flag;
687:
1.17 markus 688: case oHost:
689: *activep = 0;
1.42 provos 690: while ((arg = strdelim(&s)) != NULL && *arg != '\0')
1.38 provos 691: if (match_pattern(host, arg)) {
692: debug("Applying options for %.100s", arg);
1.17 markus 693: *activep = 1;
694: break;
695: }
1.42 provos 696: /* Avoid garbage check below, as strdelim is done. */
1.17 markus 697: return 0;
698:
699: case oEscapeChar:
700: intptr = &options->escape_char;
1.42 provos 701: arg = strdelim(&s);
1.40 ho 702: if (!arg || *arg == '\0')
1.17 markus 703: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 704: if (arg[0] == '^' && arg[2] == 0 &&
1.51 markus 705: (u_char) arg[1] >= 64 && (u_char) arg[1] < 128)
706: value = (u_char) arg[1] & 31;
1.38 provos 707: else if (strlen(arg) == 1)
1.51 markus 708: value = (u_char) arg[0];
1.38 provos 709: else if (strcmp(arg, "none") == 0)
1.79 stevesk 710: value = SSH_ESCAPECHAR_NONE;
1.17 markus 711: else {
712: fatal("%.200s line %d: Bad escape character.",
1.93 deraadt 713: filename, linenum);
1.17 markus 714: /* NOTREACHED */
715: value = 0; /* Avoid compiler warning. */
716: }
717: if (*activep && *intptr == -1)
718: *intptr = value;
1.112 djm 719: break;
720:
721: case oAddressFamily:
722: arg = strdelim(&s);
1.114 djm 723: intptr = &options->address_family;
1.112 djm 724: if (strcasecmp(arg, "inet") == 0)
1.114 djm 725: value = AF_INET;
1.112 djm 726: else if (strcasecmp(arg, "inet6") == 0)
1.114 djm 727: value = AF_INET6;
1.112 djm 728: else if (strcasecmp(arg, "any") == 0)
1.114 djm 729: value = AF_UNSPEC;
1.112 djm 730: else
731: fatal("Unsupported AddressFamily \"%s\"", arg);
1.114 djm 732: if (*activep && *intptr == -1)
733: *intptr = value;
1.17 markus 734: break;
735:
1.101 markus 736: case oEnableSSHKeysign:
737: intptr = &options->enable_ssh_keysign;
738: goto parse_flag;
739:
1.96 markus 740: case oDeprecated:
1.98 markus 741: debug("%s line %d: Deprecated option \"%s\"",
1.96 markus 742: filename, linenum, keyword);
1.98 markus 743: return 0;
1.96 markus 744:
1.110 jakob 745: case oUnsupported:
746: error("%s line %d: Unsupported option \"%s\"",
747: filename, linenum, keyword);
748: return 0;
749:
1.17 markus 750: default:
751: fatal("process_config_line: Unimplemented opcode %d", opcode);
752: }
753:
754: /* Check that there is no garbage at end of line. */
1.57 djm 755: if ((arg = strdelim(&s)) != NULL && *arg != '\0') {
1.39 ho 756: fatal("%.200s line %d: garbage at end of line; \"%.200s\".",
1.93 deraadt 757: filename, linenum, arg);
1.39 ho 758: }
1.17 markus 759: return 0;
1.1 deraadt 760: }
761:
762:
1.19 markus 763: /*
764: * Reads the config file and modifies the options accordingly. Options
765: * should already be initialized before this call. This never returns if
1.89 stevesk 766: * there is an error. If the file does not exist, this returns 0.
1.19 markus 767: */
1.1 deraadt 768:
1.89 stevesk 769: int
1.17 markus 770: read_config_file(const char *filename, const char *host, Options *options)
1.1 deraadt 771: {
1.17 markus 772: FILE *f;
773: char line[1024];
774: int active, linenum;
775: int bad_options = 0;
776:
777: /* Open the file. */
778: f = fopen(filename, "r");
779: if (!f)
1.89 stevesk 780: return 0;
1.17 markus 781:
782: debug("Reading configuration data %.200s", filename);
783:
1.19 markus 784: /*
785: * Mark that we are now processing the options. This flag is turned
786: * on/off by Host specifications.
787: */
1.17 markus 788: active = 1;
789: linenum = 0;
790: while (fgets(line, sizeof(line), f)) {
791: /* Update line number counter. */
792: linenum++;
793: if (process_config_line(options, host, line, filename, linenum, &active) != 0)
794: bad_options++;
795: }
796: fclose(f);
797: if (bad_options > 0)
1.64 millert 798: fatal("%s: terminating, %d bad configuration options",
1.93 deraadt 799: filename, bad_options);
1.89 stevesk 800: return 1;
1.1 deraadt 801: }
802:
1.19 markus 803: /*
804: * Initializes options to special values that indicate that they have not yet
805: * been set. Read_config_file will only set options with this value. Options
806: * are processed in the following order: command line, user config file,
807: * system config file. Last, fill_default_options is called.
808: */
1.1 deraadt 809:
1.26 markus 810: void
1.17 markus 811: initialize_options(Options * options)
1.1 deraadt 812: {
1.17 markus 813: memset(options, 'X', sizeof(*options));
814: options->forward_agent = -1;
815: options->forward_x11 = -1;
1.34 markus 816: options->xauth_location = NULL;
1.17 markus 817: options->gateway_ports = -1;
818: options->use_privileged_port = -1;
819: options->rsa_authentication = -1;
1.50 markus 820: options->pubkey_authentication = -1;
1.78 markus 821: options->challenge_response_authentication = -1;
1.17 markus 822: options->kerberos_authentication = -1;
1.82 dugsong 823: options->kerberos_tgt_passing = -1;
1.118 markus 824: options->gss_authentication = -1;
825: options->gss_deleg_creds = -1;
1.17 markus 826: options->password_authentication = -1;
1.48 markus 827: options->kbd_interactive_authentication = -1;
828: options->kbd_interactive_devices = NULL;
1.17 markus 829: options->rhosts_rsa_authentication = -1;
1.72 markus 830: options->hostbased_authentication = -1;
1.17 markus 831: options->batch_mode = -1;
832: options->check_host_ip = -1;
833: options->strict_host_key_checking = -1;
834: options->compression = -1;
835: options->keepalives = -1;
836: options->compression_level = -1;
837: options->port = -1;
1.114 djm 838: options->address_family = -1;
1.17 markus 839: options->connection_attempts = -1;
1.111 djm 840: options->connection_timeout = -1;
1.17 markus 841: options->number_of_password_prompts = -1;
842: options->cipher = -1;
1.25 markus 843: options->ciphers = NULL;
1.62 markus 844: options->macs = NULL;
1.76 markus 845: options->hostkeyalgorithms = NULL;
1.25 markus 846: options->protocol = SSH_PROTO_UNKNOWN;
1.17 markus 847: options->num_identity_files = 0;
848: options->hostname = NULL;
1.52 markus 849: options->host_key_alias = NULL;
1.17 markus 850: options->proxy_command = NULL;
851: options->user = NULL;
852: options->escape_char = -1;
853: options->system_hostfile = NULL;
854: options->user_hostfile = NULL;
1.27 markus 855: options->system_hostfile2 = NULL;
856: options->user_hostfile2 = NULL;
1.17 markus 857: options->num_local_forwards = 0;
858: options->num_remote_forwards = 0;
1.90 stevesk 859: options->clear_forwardings = -1;
1.95 markus 860: options->log_level = SYSLOG_LEVEL_NOT_SET;
1.67 markus 861: options->preferred_authentications = NULL;
1.77 markus 862: options->bind_address = NULL;
1.86 markus 863: options->smartcard_device = NULL;
1.101 markus 864: options->enable_ssh_keysign = - 1;
1.91 markus 865: options->no_host_authentication_for_localhost = - 1;
1.105 markus 866: options->rekey_limit = - 1;
1.107 jakob 867: options->verify_host_key_dns = -1;
1.1 deraadt 868: }
869:
1.19 markus 870: /*
871: * Called after processing other sources of option data, this fills those
872: * options for which no value has been specified with their default values.
873: */
1.1 deraadt 874:
1.26 markus 875: void
1.17 markus 876: fill_default_options(Options * options)
1.1 deraadt 877: {
1.61 deraadt 878: int len;
879:
1.17 markus 880: if (options->forward_agent == -1)
1.33 markus 881: options->forward_agent = 0;
1.17 markus 882: if (options->forward_x11 == -1)
1.23 markus 883: options->forward_x11 = 0;
1.34 markus 884: if (options->xauth_location == NULL)
1.80 markus 885: options->xauth_location = _PATH_XAUTH;
1.17 markus 886: if (options->gateway_ports == -1)
887: options->gateway_ports = 0;
888: if (options->use_privileged_port == -1)
1.65 markus 889: options->use_privileged_port = 0;
1.17 markus 890: if (options->rsa_authentication == -1)
891: options->rsa_authentication = 1;
1.50 markus 892: if (options->pubkey_authentication == -1)
893: options->pubkey_authentication = 1;
1.78 markus 894: if (options->challenge_response_authentication == -1)
1.83 markus 895: options->challenge_response_authentication = 1;
1.17 markus 896: if (options->kerberos_authentication == -1)
1.45 provos 897: options->kerberos_authentication = 1;
1.17 markus 898: if (options->kerberos_tgt_passing == -1)
899: options->kerberos_tgt_passing = 1;
1.118 markus 900: if (options->gss_authentication == -1)
901: options->gss_authentication = 1;
902: if (options->gss_deleg_creds == -1)
903: options->gss_deleg_creds = 0;
1.17 markus 904: if (options->password_authentication == -1)
905: options->password_authentication = 1;
1.48 markus 906: if (options->kbd_interactive_authentication == -1)
1.59 markus 907: options->kbd_interactive_authentication = 1;
1.17 markus 908: if (options->rhosts_rsa_authentication == -1)
1.99 stevesk 909: options->rhosts_rsa_authentication = 0;
1.72 markus 910: if (options->hostbased_authentication == -1)
911: options->hostbased_authentication = 0;
1.17 markus 912: if (options->batch_mode == -1)
913: options->batch_mode = 0;
914: if (options->check_host_ip == -1)
915: options->check_host_ip = 1;
916: if (options->strict_host_key_checking == -1)
917: options->strict_host_key_checking = 2; /* 2 is default */
918: if (options->compression == -1)
919: options->compression = 0;
920: if (options->keepalives == -1)
921: options->keepalives = 1;
922: if (options->compression_level == -1)
923: options->compression_level = 6;
924: if (options->port == -1)
925: options->port = 0; /* Filled in ssh_connect. */
1.114 djm 926: if (options->address_family == -1)
927: options->address_family = AF_UNSPEC;
1.17 markus 928: if (options->connection_attempts == -1)
1.84 markus 929: options->connection_attempts = 1;
1.17 markus 930: if (options->number_of_password_prompts == -1)
931: options->number_of_password_prompts = 3;
932: /* Selected in ssh_login(). */
933: if (options->cipher == -1)
934: options->cipher = SSH_CIPHER_NOT_SET;
1.31 markus 935: /* options->ciphers, default set in myproposals.h */
1.62 markus 936: /* options->macs, default set in myproposals.h */
1.76 markus 937: /* options->hostkeyalgorithms, default set in myproposals.h */
1.25 markus 938: if (options->protocol == SSH_PROTO_UNKNOWN)
1.69 markus 939: options->protocol = SSH_PROTO_1|SSH_PROTO_2;
1.17 markus 940: if (options->num_identity_files == 0) {
1.50 markus 941: if (options->protocol & SSH_PROTO_1) {
1.61 deraadt 942: len = 2 + strlen(_PATH_SSH_CLIENT_IDENTITY) + 1;
1.50 markus 943: options->identity_files[options->num_identity_files] =
1.61 deraadt 944: xmalloc(len);
945: snprintf(options->identity_files[options->num_identity_files++],
946: len, "~/%.100s", _PATH_SSH_CLIENT_IDENTITY);
1.50 markus 947: }
948: if (options->protocol & SSH_PROTO_2) {
1.63 deraadt 949: len = 2 + strlen(_PATH_SSH_CLIENT_ID_RSA) + 1;
950: options->identity_files[options->num_identity_files] =
951: xmalloc(len);
952: snprintf(options->identity_files[options->num_identity_files++],
953: len, "~/%.100s", _PATH_SSH_CLIENT_ID_RSA);
954:
1.61 deraadt 955: len = 2 + strlen(_PATH_SSH_CLIENT_ID_DSA) + 1;
1.50 markus 956: options->identity_files[options->num_identity_files] =
1.61 deraadt 957: xmalloc(len);
958: snprintf(options->identity_files[options->num_identity_files++],
959: len, "~/%.100s", _PATH_SSH_CLIENT_ID_DSA);
1.50 markus 960: }
1.27 markus 961: }
1.17 markus 962: if (options->escape_char == -1)
963: options->escape_char = '~';
964: if (options->system_hostfile == NULL)
1.55 markus 965: options->system_hostfile = _PATH_SSH_SYSTEM_HOSTFILE;
1.17 markus 966: if (options->user_hostfile == NULL)
1.55 markus 967: options->user_hostfile = _PATH_SSH_USER_HOSTFILE;
1.27 markus 968: if (options->system_hostfile2 == NULL)
1.55 markus 969: options->system_hostfile2 = _PATH_SSH_SYSTEM_HOSTFILE2;
1.27 markus 970: if (options->user_hostfile2 == NULL)
1.55 markus 971: options->user_hostfile2 = _PATH_SSH_USER_HOSTFILE2;
1.95 markus 972: if (options->log_level == SYSLOG_LEVEL_NOT_SET)
1.54 markus 973: options->log_level = SYSLOG_LEVEL_INFO;
1.90 stevesk 974: if (options->clear_forwardings == 1)
975: clear_forwardings(options);
1.91 markus 976: if (options->no_host_authentication_for_localhost == - 1)
977: options->no_host_authentication_for_localhost = 0;
1.101 markus 978: if (options->enable_ssh_keysign == -1)
979: options->enable_ssh_keysign = 0;
1.105 markus 980: if (options->rekey_limit == -1)
981: options->rekey_limit = 0;
1.107 jakob 982: if (options->verify_host_key_dns == -1)
983: options->verify_host_key_dns = 0;
1.17 markus 984: /* options->proxy_command should not be set by default */
985: /* options->user will be set in the main program if appropriate */
986: /* options->hostname will be set in the main program if appropriate */
1.52 markus 987: /* options->host_key_alias should not be set by default */
1.67 markus 988: /* options->preferred_authentications will be set in ssh */
1.1 deraadt 989: }
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