Annotation of src/usr.bin/ssh/readconf.c, Revision 1.129
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"
1.129 ! djm 15: RCSID("$OpenBSD: readconf.c,v 1.128 2004/03/05 10:53:58 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
1.126 markus 81: TcpKeepAlive no
1.1 deraadt 82: IdentityFile ~/.ssh/identity
83: Port 22
84: EscapeChar ~
85:
86: */
87:
88: /* Keyword tokens. */
89:
1.17 markus 90: typedef enum {
91: oBadOption,
1.123 markus 92: oForwardAgent, oForwardX11, oForwardX11Trusted, oGatewayPorts,
1.100 deraadt 93: oPasswordAuthentication, oRSAAuthentication,
1.59 markus 94: oChallengeResponseAuthentication, oXAuthLocation,
1.17 markus 95: oIdentityFile, oHostName, oPort, oCipher, oRemoteForward, oLocalForward,
96: oUser, oHost, oEscapeChar, oRhostsRSAAuthentication, oProxyCommand,
97: oGlobalKnownHostsFile, oUserKnownHostsFile, oConnectionAttempts,
98: oBatchMode, oCheckHostIP, oStrictHostKeyChecking, oCompression,
1.126 markus 99: oCompressionLevel, oTCPKeepAlive, oNumberOfPasswordPrompts,
1.62 markus 100: oUsePrivilegedPort, oLogLevel, oCiphers, oProtocol, oMacs,
1.50 markus 101: oGlobalKnownHostsFile2, oUserKnownHostsFile2, oPubkeyAuthentication,
1.67 markus 102: oKbdInteractiveAuthentication, oKbdInteractiveDevices, oHostKeyAlias,
1.76 markus 103: oDynamicForward, oPreferredAuthentications, oHostbasedAuthentication,
1.90 stevesk 104: oHostKeyAlgorithms, oBindAddress, oSmartcardDevice,
1.96 markus 105: oClearAllForwardings, oNoHostAuthenticationForLocalhost,
1.111 djm 106: oEnableSSHKeysign, oRekeyLimit, oVerifyHostKeyDNS, oConnectTimeout,
1.118 markus 107: oAddressFamily, oGssAuthentication, oGssDelegateCreds,
1.128 markus 108: oServerAliveInterval, oServerAliveCountMax, oIdentitiesOnly,
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 },
1.123 markus 120: { "forwardx11trusted", oForwardX11Trusted },
1.34 markus 121: { "xauthlocation", oXAuthLocation },
1.17 markus 122: { "gatewayports", oGatewayPorts },
123: { "useprivilegedport", oUsePrivilegedPort },
1.116 markus 124: { "rhostsauthentication", oDeprecated },
1.17 markus 125: { "passwordauthentication", oPasswordAuthentication },
1.48 markus 126: { "kbdinteractiveauthentication", oKbdInteractiveAuthentication },
127: { "kbdinteractivedevices", oKbdInteractiveDevices },
1.17 markus 128: { "rsaauthentication", oRSAAuthentication },
1.50 markus 129: { "pubkeyauthentication", oPubkeyAuthentication },
1.59 markus 130: { "dsaauthentication", oPubkeyAuthentication }, /* alias */
1.72 markus 131: { "rhostsrsaauthentication", oRhostsRSAAuthentication },
1.73 markus 132: { "hostbasedauthentication", oHostbasedAuthentication },
1.59 markus 133: { "challengeresponseauthentication", oChallengeResponseAuthentication },
134: { "skeyauthentication", oChallengeResponseAuthentication }, /* alias */
135: { "tisauthentication", oChallengeResponseAuthentication }, /* alias */
1.110 jakob 136: { "kerberosauthentication", oUnsupported },
137: { "kerberostgtpassing", oUnsupported },
138: { "afstokenpassing", oUnsupported },
1.118 markus 139: #if defined(GSSAPI)
140: { "gssapiauthentication", oGssAuthentication },
141: { "gssapidelegatecredentials", oGssDelegateCreds },
142: #else
143: { "gssapiauthentication", oUnsupported },
144: { "gssapidelegatecredentials", oUnsupported },
145: #endif
1.96 markus 146: { "fallbacktorsh", oDeprecated },
147: { "usersh", oDeprecated },
1.17 markus 148: { "identityfile", oIdentityFile },
1.50 markus 149: { "identityfile2", oIdentityFile }, /* alias */
1.128 markus 150: { "identitiesonly", oIdentitiesOnly },
1.17 markus 151: { "hostname", oHostName },
1.52 markus 152: { "hostkeyalias", oHostKeyAlias },
1.17 markus 153: { "proxycommand", oProxyCommand },
154: { "port", oPort },
155: { "cipher", oCipher },
1.25 markus 156: { "ciphers", oCiphers },
1.62 markus 157: { "macs", oMacs },
1.25 markus 158: { "protocol", oProtocol },
1.17 markus 159: { "remoteforward", oRemoteForward },
160: { "localforward", oLocalForward },
161: { "user", oUser },
162: { "host", oHost },
163: { "escapechar", oEscapeChar },
164: { "globalknownhostsfile", oGlobalKnownHostsFile },
1.81 markus 165: { "userknownhostsfile", oUserKnownHostsFile }, /* obsolete */
1.27 markus 166: { "globalknownhostsfile2", oGlobalKnownHostsFile2 },
1.81 markus 167: { "userknownhostsfile2", oUserKnownHostsFile2 }, /* obsolete */
1.17 markus 168: { "connectionattempts", oConnectionAttempts },
169: { "batchmode", oBatchMode },
170: { "checkhostip", oCheckHostIP },
171: { "stricthostkeychecking", oStrictHostKeyChecking },
172: { "compression", oCompression },
173: { "compressionlevel", oCompressionLevel },
1.126 markus 174: { "tcpkeepalive", oTCPKeepAlive },
175: { "keepalive", oTCPKeepAlive }, /* obsolete */
1.17 markus 176: { "numberofpasswordprompts", oNumberOfPasswordPrompts },
177: { "loglevel", oLogLevel },
1.71 markus 178: { "dynamicforward", oDynamicForward },
1.67 markus 179: { "preferredauthentications", oPreferredAuthentications },
1.76 markus 180: { "hostkeyalgorithms", oHostKeyAlgorithms },
1.77 markus 181: { "bindaddress", oBindAddress },
1.110 jakob 182: #ifdef SMARTCARD
1.85 jakob 183: { "smartcarddevice", oSmartcardDevice },
1.110 jakob 184: #else
185: { "smartcarddevice", oUnsupported },
186: #endif
1.93 deraadt 187: { "clearallforwardings", oClearAllForwardings },
1.101 markus 188: { "enablesshkeysign", oEnableSSHKeysign },
1.107 jakob 189: { "verifyhostkeydns", oVerifyHostKeyDNS },
1.93 deraadt 190: { "nohostauthenticationforlocalhost", oNoHostAuthenticationForLocalhost },
1.105 markus 191: { "rekeylimit", oRekeyLimit },
1.111 djm 192: { "connecttimeout", oConnectTimeout },
1.112 djm 193: { "addressfamily", oAddressFamily },
1.127 markus 194: { "serveraliveinterval", oServerAliveInterval },
195: { "serveralivecountmax", oServerAliveCountMax },
1.92 stevesk 196: { NULL, oBadOption }
1.13 markus 197: };
198:
1.19 markus 199: /*
200: * Adds a local TCP/IP port forward to options. Never returns if there is an
201: * error.
202: */
1.1 deraadt 203:
1.26 markus 204: void
1.22 markus 205: add_local_forward(Options *options, u_short port, const char *host,
206: u_short host_port)
1.1 deraadt 207: {
1.17 markus 208: Forward *fwd;
209: extern uid_t original_real_uid;
210: if (port < IPPORT_RESERVED && original_real_uid != 0)
1.64 millert 211: fatal("Privileged ports can only be forwarded by root.");
1.17 markus 212: if (options->num_local_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
213: fatal("Too many local forwards (max %d).", SSH_MAX_FORWARDS_PER_DIRECTION);
214: fwd = &options->local_forwards[options->num_local_forwards++];
215: fwd->port = port;
216: fwd->host = xstrdup(host);
217: fwd->host_port = host_port;
1.1 deraadt 218: }
219:
1.19 markus 220: /*
221: * Adds a remote TCP/IP port forward to options. Never returns if there is
222: * an error.
223: */
1.1 deraadt 224:
1.26 markus 225: void
1.22 markus 226: add_remote_forward(Options *options, u_short port, const char *host,
227: u_short host_port)
1.1 deraadt 228: {
1.17 markus 229: Forward *fwd;
230: if (options->num_remote_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
231: fatal("Too many remote forwards (max %d).",
1.93 deraadt 232: SSH_MAX_FORWARDS_PER_DIRECTION);
1.17 markus 233: fwd = &options->remote_forwards[options->num_remote_forwards++];
234: fwd->port = port;
235: fwd->host = xstrdup(host);
236: fwd->host_port = host_port;
1.1 deraadt 237: }
238:
1.90 stevesk 239: static void
240: clear_forwardings(Options *options)
241: {
242: int i;
243:
244: for (i = 0; i < options->num_local_forwards; i++)
245: xfree(options->local_forwards[i].host);
246: options->num_local_forwards = 0;
247: for (i = 0; i < options->num_remote_forwards; i++)
248: xfree(options->remote_forwards[i].host);
249: options->num_remote_forwards = 0;
250: }
251:
1.19 markus 252: /*
1.70 stevesk 253: * Returns the number of the token pointed to by cp or oBadOption.
1.19 markus 254: */
1.1 deraadt 255:
1.26 markus 256: static OpCodes
1.17 markus 257: parse_token(const char *cp, const char *filename, int linenum)
1.1 deraadt 258: {
1.51 markus 259: u_int i;
1.1 deraadt 260:
1.17 markus 261: for (i = 0; keywords[i].name; i++)
1.20 markus 262: if (strcasecmp(cp, keywords[i].name) == 0)
1.17 markus 263: return keywords[i].opcode;
264:
1.75 stevesk 265: error("%s: line %d: Bad configuration option: %s",
266: filename, linenum, cp);
1.17 markus 267: return oBadOption;
1.1 deraadt 268: }
269:
1.19 markus 270: /*
271: * Processes a single option line as used in the configuration files. This
272: * only sets those values that have not already been set.
273: */
1.102 markus 274: #define WHITESPACE " \t\r\n"
1.1 deraadt 275:
1.14 markus 276: int
277: process_config_line(Options *options, const char *host,
1.17 markus 278: char *line, const char *filename, int linenum,
279: int *activep)
1.1 deraadt 280: {
1.102 markus 281: char buf[256], *s, **charptr, *endofnumber, *keyword, *arg;
1.22 markus 282: int opcode, *intptr, value;
1.102 markus 283: size_t len;
1.22 markus 284: u_short fwd_port, fwd_host_port;
1.88 stevesk 285: char sfwd_host_port[6];
1.106 djm 286:
287: /* Strip trailing whitespace */
288: for(len = strlen(line) - 1; len > 0; len--) {
289: if (strchr(WHITESPACE, line[len]) == NULL)
290: break;
291: line[len] = '\0';
292: }
1.1 deraadt 293:
1.42 provos 294: s = line;
295: /* Get the keyword. (Each line is supposed to begin with a keyword). */
296: keyword = strdelim(&s);
297: /* Ignore leading whitespace. */
298: if (*keyword == '\0')
1.43 markus 299: keyword = strdelim(&s);
1.56 deraadt 300: if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#')
1.17 markus 301: return 0;
302:
1.38 provos 303: opcode = parse_token(keyword, filename, linenum);
1.17 markus 304:
305: switch (opcode) {
306: case oBadOption:
1.19 markus 307: /* don't panic, but count bad options */
308: return -1;
1.17 markus 309: /* NOTREACHED */
1.111 djm 310: case oConnectTimeout:
311: intptr = &options->connection_timeout;
1.127 markus 312: parse_time:
1.111 djm 313: arg = strdelim(&s);
314: if (!arg || *arg == '\0')
315: fatal("%s line %d: missing time value.",
316: filename, linenum);
317: if ((value = convtime(arg)) == -1)
318: fatal("%s line %d: invalid time value.",
319: filename, linenum);
320: if (*intptr == -1)
321: *intptr = value;
322: break;
323:
1.17 markus 324: case oForwardAgent:
325: intptr = &options->forward_agent;
326: parse_flag:
1.42 provos 327: arg = strdelim(&s);
1.40 ho 328: if (!arg || *arg == '\0')
1.17 markus 329: fatal("%.200s line %d: Missing yes/no argument.", filename, linenum);
330: value = 0; /* To avoid compiler warning... */
1.38 provos 331: if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
1.17 markus 332: value = 1;
1.38 provos 333: else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
1.17 markus 334: value = 0;
335: else
336: fatal("%.200s line %d: Bad yes/no argument.", filename, linenum);
337: if (*activep && *intptr == -1)
338: *intptr = value;
339: break;
340:
341: case oForwardX11:
342: intptr = &options->forward_x11;
343: goto parse_flag;
344:
1.123 markus 345: case oForwardX11Trusted:
346: intptr = &options->forward_x11_trusted;
347: goto parse_flag;
348:
1.17 markus 349: case oGatewayPorts:
350: intptr = &options->gateway_ports;
351: goto parse_flag;
352:
353: case oUsePrivilegedPort:
354: intptr = &options->use_privileged_port;
355: goto parse_flag;
356:
357: case oPasswordAuthentication:
358: intptr = &options->password_authentication;
359: goto parse_flag;
360:
1.48 markus 361: case oKbdInteractiveAuthentication:
362: intptr = &options->kbd_interactive_authentication;
363: goto parse_flag;
364:
365: case oKbdInteractiveDevices:
366: charptr = &options->kbd_interactive_devices;
367: goto parse_string;
368:
1.50 markus 369: case oPubkeyAuthentication:
370: intptr = &options->pubkey_authentication;
1.30 markus 371: goto parse_flag;
372:
1.17 markus 373: case oRSAAuthentication:
374: intptr = &options->rsa_authentication;
375: goto parse_flag;
376:
377: case oRhostsRSAAuthentication:
378: intptr = &options->rhosts_rsa_authentication;
379: goto parse_flag;
380:
1.72 markus 381: case oHostbasedAuthentication:
382: intptr = &options->hostbased_authentication;
383: goto parse_flag;
384:
1.59 markus 385: case oChallengeResponseAuthentication:
1.78 markus 386: intptr = &options->challenge_response_authentication;
1.17 markus 387: goto parse_flag;
1.108 jakob 388:
1.118 markus 389: case oGssAuthentication:
390: intptr = &options->gss_authentication;
391: goto parse_flag;
392:
393: case oGssDelegateCreds:
394: intptr = &options->gss_deleg_creds;
395: goto parse_flag;
396:
1.17 markus 397: case oBatchMode:
398: intptr = &options->batch_mode;
399: goto parse_flag;
400:
401: case oCheckHostIP:
402: intptr = &options->check_host_ip;
403: goto parse_flag;
404:
1.107 jakob 405: case oVerifyHostKeyDNS:
406: intptr = &options->verify_host_key_dns;
1.125 jakob 407: goto parse_yesnoask;
1.107 jakob 408:
1.17 markus 409: case oStrictHostKeyChecking:
410: intptr = &options->strict_host_key_checking;
1.125 jakob 411: parse_yesnoask:
1.42 provos 412: arg = strdelim(&s);
1.40 ho 413: if (!arg || *arg == '\0')
1.60 stevesk 414: fatal("%.200s line %d: Missing yes/no/ask argument.",
1.93 deraadt 415: filename, linenum);
1.17 markus 416: value = 0; /* To avoid compiler warning... */
1.38 provos 417: if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
1.17 markus 418: value = 1;
1.38 provos 419: else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
1.17 markus 420: value = 0;
1.38 provos 421: else if (strcmp(arg, "ask") == 0)
1.17 markus 422: value = 2;
423: else
424: fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum);
425: if (*activep && *intptr == -1)
426: *intptr = value;
427: break;
428:
429: case oCompression:
430: intptr = &options->compression;
431: goto parse_flag;
432:
1.126 markus 433: case oTCPKeepAlive:
434: intptr = &options->tcp_keep_alive;
1.17 markus 435: goto parse_flag;
436:
1.91 markus 437: case oNoHostAuthenticationForLocalhost:
438: intptr = &options->no_host_authentication_for_localhost;
439: goto parse_flag;
440:
1.17 markus 441: case oNumberOfPasswordPrompts:
442: intptr = &options->number_of_password_prompts;
443: goto parse_int;
444:
445: case oCompressionLevel:
446: intptr = &options->compression_level;
447: goto parse_int;
448:
1.105 markus 449: case oRekeyLimit:
450: intptr = &options->rekey_limit;
451: arg = strdelim(&s);
452: if (!arg || *arg == '\0')
453: fatal("%.200s line %d: Missing argument.", filename, linenum);
454: if (arg[0] < '0' || arg[0] > '9')
455: fatal("%.200s line %d: Bad number.", filename, linenum);
456: value = strtol(arg, &endofnumber, 10);
457: if (arg == endofnumber)
458: fatal("%.200s line %d: Bad number.", filename, linenum);
459: switch (toupper(*endofnumber)) {
460: case 'K':
461: value *= 1<<10;
462: break;
463: case 'M':
464: value *= 1<<20;
465: break;
466: case 'G':
467: value *= 1<<30;
468: break;
469: }
470: if (*activep && *intptr == -1)
471: *intptr = value;
472: break;
473:
1.17 markus 474: case oIdentityFile:
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);
478: if (*activep) {
1.50 markus 479: intptr = &options->num_identity_files;
1.27 markus 480: if (*intptr >= SSH_MAX_IDENTITY_FILES)
1.17 markus 481: fatal("%.200s line %d: Too many identity files specified (max %d).",
1.93 deraadt 482: filename, linenum, SSH_MAX_IDENTITY_FILES);
1.50 markus 483: charptr = &options->identity_files[*intptr];
1.38 provos 484: *charptr = xstrdup(arg);
1.27 markus 485: *intptr = *intptr + 1;
1.17 markus 486: }
487: break;
488:
1.34 markus 489: case oXAuthLocation:
490: charptr=&options->xauth_location;
491: goto parse_string;
492:
1.17 markus 493: case oUser:
494: charptr = &options->user;
495: parse_string:
1.42 provos 496: arg = strdelim(&s);
1.40 ho 497: if (!arg || *arg == '\0')
1.17 markus 498: fatal("%.200s line %d: Missing argument.", filename, linenum);
499: if (*activep && *charptr == NULL)
1.38 provos 500: *charptr = xstrdup(arg);
1.17 markus 501: break;
502:
503: case oGlobalKnownHostsFile:
504: charptr = &options->system_hostfile;
505: goto parse_string;
506:
507: case oUserKnownHostsFile:
508: charptr = &options->user_hostfile;
509: goto parse_string;
510:
1.27 markus 511: case oGlobalKnownHostsFile2:
512: charptr = &options->system_hostfile2;
513: goto parse_string;
514:
515: case oUserKnownHostsFile2:
516: charptr = &options->user_hostfile2;
517: goto parse_string;
518:
1.17 markus 519: case oHostName:
520: charptr = &options->hostname;
521: goto parse_string;
522:
1.52 markus 523: case oHostKeyAlias:
524: charptr = &options->host_key_alias;
525: goto parse_string;
526:
1.67 markus 527: case oPreferredAuthentications:
528: charptr = &options->preferred_authentications;
529: goto parse_string;
530:
1.77 markus 531: case oBindAddress:
532: charptr = &options->bind_address;
533: goto parse_string;
534:
1.85 jakob 535: case oSmartcardDevice:
1.86 markus 536: charptr = &options->smartcard_device;
537: goto parse_string;
1.85 jakob 538:
1.17 markus 539: case oProxyCommand:
1.113 markus 540: if (s == NULL)
541: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.17 markus 542: charptr = &options->proxy_command;
1.102 markus 543: len = strspn(s, WHITESPACE "=");
1.17 markus 544: if (*activep && *charptr == NULL)
1.102 markus 545: *charptr = xstrdup(s + len);
1.17 markus 546: return 0;
547:
548: case oPort:
549: intptr = &options->port;
550: parse_int:
1.42 provos 551: arg = strdelim(&s);
1.40 ho 552: if (!arg || *arg == '\0')
1.17 markus 553: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 554: if (arg[0] < '0' || arg[0] > '9')
1.17 markus 555: fatal("%.200s line %d: Bad number.", filename, linenum);
1.21 markus 556:
557: /* Octal, decimal, or hex format? */
1.38 provos 558: value = strtol(arg, &endofnumber, 0);
559: if (arg == endofnumber)
1.21 markus 560: fatal("%.200s line %d: Bad number.", filename, linenum);
1.17 markus 561: if (*activep && *intptr == -1)
562: *intptr = value;
563: break;
564:
565: case oConnectionAttempts:
566: intptr = &options->connection_attempts;
567: goto parse_int;
568:
569: case oCipher:
570: intptr = &options->cipher;
1.42 provos 571: arg = strdelim(&s);
1.40 ho 572: if (!arg || *arg == '\0')
1.32 markus 573: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 574: value = cipher_number(arg);
1.17 markus 575: if (value == -1)
576: fatal("%.200s line %d: Bad cipher '%s'.",
1.93 deraadt 577: filename, linenum, arg ? arg : "<NONE>");
1.17 markus 578: if (*activep && *intptr == -1)
579: *intptr = value;
580: break;
581:
1.25 markus 582: case oCiphers:
1.42 provos 583: arg = strdelim(&s);
1.40 ho 584: if (!arg || *arg == '\0')
1.32 markus 585: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 586: if (!ciphers_valid(arg))
1.31 markus 587: fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.",
1.93 deraadt 588: filename, linenum, arg ? arg : "<NONE>");
1.25 markus 589: if (*activep && options->ciphers == NULL)
1.38 provos 590: options->ciphers = xstrdup(arg);
1.25 markus 591: break;
592:
1.62 markus 593: case oMacs:
594: arg = strdelim(&s);
595: if (!arg || *arg == '\0')
596: fatal("%.200s line %d: Missing argument.", filename, linenum);
597: if (!mac_valid(arg))
598: fatal("%.200s line %d: Bad SSH2 Mac spec '%s'.",
1.93 deraadt 599: filename, linenum, arg ? arg : "<NONE>");
1.62 markus 600: if (*activep && options->macs == NULL)
601: options->macs = xstrdup(arg);
602: break;
603:
1.76 markus 604: case oHostKeyAlgorithms:
605: arg = strdelim(&s);
606: if (!arg || *arg == '\0')
607: fatal("%.200s line %d: Missing argument.", filename, linenum);
608: if (!key_names_valid2(arg))
609: fatal("%.200s line %d: Bad protocol 2 host key algorithms '%s'.",
1.93 deraadt 610: filename, linenum, arg ? arg : "<NONE>");
1.76 markus 611: if (*activep && options->hostkeyalgorithms == NULL)
612: options->hostkeyalgorithms = xstrdup(arg);
613: break;
614:
1.25 markus 615: case oProtocol:
616: intptr = &options->protocol;
1.42 provos 617: arg = strdelim(&s);
1.40 ho 618: if (!arg || *arg == '\0')
1.32 markus 619: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 620: value = proto_spec(arg);
1.25 markus 621: if (value == SSH_PROTO_UNKNOWN)
622: fatal("%.200s line %d: Bad protocol spec '%s'.",
1.93 deraadt 623: filename, linenum, arg ? arg : "<NONE>");
1.25 markus 624: if (*activep && *intptr == SSH_PROTO_UNKNOWN)
625: *intptr = value;
626: break;
627:
1.17 markus 628: case oLogLevel:
629: intptr = (int *) &options->log_level;
1.42 provos 630: arg = strdelim(&s);
1.38 provos 631: value = log_level_number(arg);
1.95 markus 632: if (value == SYSLOG_LEVEL_NOT_SET)
1.64 millert 633: fatal("%.200s line %d: unsupported log level '%s'",
1.93 deraadt 634: filename, linenum, arg ? arg : "<NONE>");
1.95 markus 635: if (*activep && (LogLevel) *intptr == SYSLOG_LEVEL_NOT_SET)
1.17 markus 636: *intptr = (LogLevel) value;
637: break;
638:
1.88 stevesk 639: case oLocalForward:
1.17 markus 640: case oRemoteForward:
1.42 provos 641: arg = strdelim(&s);
1.40 ho 642: if (!arg || *arg == '\0')
1.88 stevesk 643: fatal("%.200s line %d: Missing port argument.",
644: filename, linenum);
645: if ((fwd_port = a2port(arg)) == 0)
646: fatal("%.200s line %d: Bad listen port.",
647: filename, linenum);
1.42 provos 648: arg = strdelim(&s);
1.40 ho 649: if (!arg || *arg == '\0')
1.17 markus 650: fatal("%.200s line %d: Missing second argument.",
1.88 stevesk 651: filename, linenum);
652: if (sscanf(arg, "%255[^:]:%5[0-9]", buf, sfwd_host_port) != 2 &&
653: sscanf(arg, "%255[^/]/%5[0-9]", buf, sfwd_host_port) != 2)
654: fatal("%.200s line %d: Bad forwarding specification.",
655: filename, linenum);
656: if ((fwd_host_port = a2port(sfwd_host_port)) == 0)
657: fatal("%.200s line %d: Bad forwarding port.",
658: filename, linenum);
659: if (*activep) {
660: if (opcode == oLocalForward)
661: add_local_forward(options, fwd_port, buf,
662: fwd_host_port);
663: else if (opcode == oRemoteForward)
664: add_remote_forward(options, fwd_port, buf,
665: fwd_host_port);
666: }
1.17 markus 667: break;
1.71 markus 668:
669: case oDynamicForward:
670: arg = strdelim(&s);
671: if (!arg || *arg == '\0')
672: fatal("%.200s line %d: Missing port argument.",
673: filename, linenum);
1.74 stevesk 674: fwd_port = a2port(arg);
675: if (fwd_port == 0)
1.71 markus 676: fatal("%.200s line %d: Badly formatted port number.",
677: filename, linenum);
1.87 markus 678: if (*activep)
1.117 markus 679: add_local_forward(options, fwd_port, "socks", 0);
1.72 markus 680: break;
1.17 markus 681:
1.90 stevesk 682: case oClearAllForwardings:
683: intptr = &options->clear_forwardings;
684: goto parse_flag;
685:
1.17 markus 686: case oHost:
687: *activep = 0;
1.42 provos 688: while ((arg = strdelim(&s)) != NULL && *arg != '\0')
1.38 provos 689: if (match_pattern(host, arg)) {
690: debug("Applying options for %.100s", arg);
1.17 markus 691: *activep = 1;
692: break;
693: }
1.42 provos 694: /* Avoid garbage check below, as strdelim is done. */
1.17 markus 695: return 0;
696:
697: case oEscapeChar:
698: intptr = &options->escape_char;
1.42 provos 699: arg = strdelim(&s);
1.40 ho 700: if (!arg || *arg == '\0')
1.17 markus 701: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 702: if (arg[0] == '^' && arg[2] == 0 &&
1.51 markus 703: (u_char) arg[1] >= 64 && (u_char) arg[1] < 128)
704: value = (u_char) arg[1] & 31;
1.38 provos 705: else if (strlen(arg) == 1)
1.51 markus 706: value = (u_char) arg[0];
1.38 provos 707: else if (strcmp(arg, "none") == 0)
1.79 stevesk 708: value = SSH_ESCAPECHAR_NONE;
1.17 markus 709: else {
710: fatal("%.200s line %d: Bad escape character.",
1.93 deraadt 711: filename, linenum);
1.17 markus 712: /* NOTREACHED */
713: value = 0; /* Avoid compiler warning. */
714: }
715: if (*activep && *intptr == -1)
716: *intptr = value;
1.112 djm 717: break;
718:
719: case oAddressFamily:
720: arg = strdelim(&s);
1.114 djm 721: intptr = &options->address_family;
1.112 djm 722: if (strcasecmp(arg, "inet") == 0)
1.114 djm 723: value = AF_INET;
1.112 djm 724: else if (strcasecmp(arg, "inet6") == 0)
1.114 djm 725: value = AF_INET6;
1.112 djm 726: else if (strcasecmp(arg, "any") == 0)
1.114 djm 727: value = AF_UNSPEC;
1.112 djm 728: else
729: fatal("Unsupported AddressFamily \"%s\"", arg);
1.114 djm 730: if (*activep && *intptr == -1)
731: *intptr = value;
1.17 markus 732: break;
733:
1.101 markus 734: case oEnableSSHKeysign:
735: intptr = &options->enable_ssh_keysign;
736: goto parse_flag;
737:
1.128 markus 738: case oIdentitiesOnly:
739: intptr = &options->identities_only;
740: goto parse_flag;
741:
1.127 markus 742: case oServerAliveInterval:
743: intptr = &options->server_alive_interval;
744: goto parse_time;
745:
746: case oServerAliveCountMax:
747: intptr = &options->server_alive_count_max;
748: goto parse_int;
749:
1.96 markus 750: case oDeprecated:
1.98 markus 751: debug("%s line %d: Deprecated option \"%s\"",
1.96 markus 752: filename, linenum, keyword);
1.98 markus 753: return 0;
1.96 markus 754:
1.110 jakob 755: case oUnsupported:
756: error("%s line %d: Unsupported option \"%s\"",
757: filename, linenum, keyword);
758: return 0;
759:
1.17 markus 760: default:
761: fatal("process_config_line: Unimplemented opcode %d", opcode);
762: }
763:
764: /* Check that there is no garbage at end of line. */
1.57 djm 765: if ((arg = strdelim(&s)) != NULL && *arg != '\0') {
1.39 ho 766: fatal("%.200s line %d: garbage at end of line; \"%.200s\".",
1.93 deraadt 767: filename, linenum, arg);
1.39 ho 768: }
1.17 markus 769: return 0;
1.1 deraadt 770: }
771:
772:
1.19 markus 773: /*
774: * Reads the config file and modifies the options accordingly. Options
775: * should already be initialized before this call. This never returns if
1.89 stevesk 776: * there is an error. If the file does not exist, this returns 0.
1.19 markus 777: */
1.1 deraadt 778:
1.89 stevesk 779: int
1.129 ! djm 780: read_config_file(const char *filename, const char *host, Options *options,
! 781: int checkperm)
1.1 deraadt 782: {
1.17 markus 783: FILE *f;
784: char line[1024];
785: int active, linenum;
786: int bad_options = 0;
787:
788: /* Open the file. */
1.129 ! djm 789: if ((f = fopen(filename, "r")) == NULL)
1.89 stevesk 790: return 0;
1.129 ! djm 791:
! 792: if (checkperm) {
! 793: struct stat sb;
! 794:
! 795: if (fstat(fileno(f), &sb) == -1) {
! 796: fatal("fstat %s: %s", filename, strerror(errno));
! 797: fclose(f);
! 798: return (0);
! 799: }
! 800: if (((sb.st_uid != 0 && sb.st_uid != getuid()) ||
! 801: (sb.st_mode & 022) != 0)) {
! 802: fatal("Bad owner or permissions on %s", filename);
! 803: return 0;
! 804: }
! 805: }
1.17 markus 806:
807: debug("Reading configuration data %.200s", filename);
808:
1.19 markus 809: /*
810: * Mark that we are now processing the options. This flag is turned
811: * on/off by Host specifications.
812: */
1.17 markus 813: active = 1;
814: linenum = 0;
815: while (fgets(line, sizeof(line), f)) {
816: /* Update line number counter. */
817: linenum++;
818: if (process_config_line(options, host, line, filename, linenum, &active) != 0)
819: bad_options++;
820: }
821: fclose(f);
822: if (bad_options > 0)
1.64 millert 823: fatal("%s: terminating, %d bad configuration options",
1.93 deraadt 824: filename, bad_options);
1.89 stevesk 825: return 1;
1.1 deraadt 826: }
827:
1.19 markus 828: /*
829: * Initializes options to special values that indicate that they have not yet
830: * been set. Read_config_file will only set options with this value. Options
831: * are processed in the following order: command line, user config file,
832: * system config file. Last, fill_default_options is called.
833: */
1.1 deraadt 834:
1.26 markus 835: void
1.17 markus 836: initialize_options(Options * options)
1.1 deraadt 837: {
1.17 markus 838: memset(options, 'X', sizeof(*options));
839: options->forward_agent = -1;
840: options->forward_x11 = -1;
1.123 markus 841: options->forward_x11_trusted = -1;
1.34 markus 842: options->xauth_location = NULL;
1.17 markus 843: options->gateway_ports = -1;
844: options->use_privileged_port = -1;
845: options->rsa_authentication = -1;
1.50 markus 846: options->pubkey_authentication = -1;
1.78 markus 847: options->challenge_response_authentication = -1;
1.118 markus 848: options->gss_authentication = -1;
849: options->gss_deleg_creds = -1;
1.17 markus 850: options->password_authentication = -1;
1.48 markus 851: options->kbd_interactive_authentication = -1;
852: options->kbd_interactive_devices = NULL;
1.17 markus 853: options->rhosts_rsa_authentication = -1;
1.72 markus 854: options->hostbased_authentication = -1;
1.17 markus 855: options->batch_mode = -1;
856: options->check_host_ip = -1;
857: options->strict_host_key_checking = -1;
858: options->compression = -1;
1.126 markus 859: options->tcp_keep_alive = -1;
1.17 markus 860: options->compression_level = -1;
861: options->port = -1;
1.114 djm 862: options->address_family = -1;
1.17 markus 863: options->connection_attempts = -1;
1.111 djm 864: options->connection_timeout = -1;
1.17 markus 865: options->number_of_password_prompts = -1;
866: options->cipher = -1;
1.25 markus 867: options->ciphers = NULL;
1.62 markus 868: options->macs = NULL;
1.76 markus 869: options->hostkeyalgorithms = NULL;
1.25 markus 870: options->protocol = SSH_PROTO_UNKNOWN;
1.17 markus 871: options->num_identity_files = 0;
872: options->hostname = NULL;
1.52 markus 873: options->host_key_alias = NULL;
1.17 markus 874: options->proxy_command = NULL;
875: options->user = NULL;
876: options->escape_char = -1;
877: options->system_hostfile = NULL;
878: options->user_hostfile = NULL;
1.27 markus 879: options->system_hostfile2 = NULL;
880: options->user_hostfile2 = NULL;
1.17 markus 881: options->num_local_forwards = 0;
882: options->num_remote_forwards = 0;
1.90 stevesk 883: options->clear_forwardings = -1;
1.95 markus 884: options->log_level = SYSLOG_LEVEL_NOT_SET;
1.67 markus 885: options->preferred_authentications = NULL;
1.77 markus 886: options->bind_address = NULL;
1.86 markus 887: options->smartcard_device = NULL;
1.101 markus 888: options->enable_ssh_keysign = - 1;
1.91 markus 889: options->no_host_authentication_for_localhost = - 1;
1.128 markus 890: options->identities_only = - 1;
1.105 markus 891: options->rekey_limit = - 1;
1.107 jakob 892: options->verify_host_key_dns = -1;
1.127 markus 893: options->server_alive_interval = -1;
894: options->server_alive_count_max = -1;
1.1 deraadt 895: }
896:
1.19 markus 897: /*
898: * Called after processing other sources of option data, this fills those
899: * options for which no value has been specified with their default values.
900: */
1.1 deraadt 901:
1.26 markus 902: void
1.17 markus 903: fill_default_options(Options * options)
1.1 deraadt 904: {
1.61 deraadt 905: int len;
906:
1.17 markus 907: if (options->forward_agent == -1)
1.33 markus 908: options->forward_agent = 0;
1.17 markus 909: if (options->forward_x11 == -1)
1.23 markus 910: options->forward_x11 = 0;
1.123 markus 911: if (options->forward_x11_trusted == -1)
912: options->forward_x11_trusted = 0;
1.34 markus 913: if (options->xauth_location == NULL)
1.80 markus 914: options->xauth_location = _PATH_XAUTH;
1.17 markus 915: if (options->gateway_ports == -1)
916: options->gateway_ports = 0;
917: if (options->use_privileged_port == -1)
1.65 markus 918: options->use_privileged_port = 0;
1.17 markus 919: if (options->rsa_authentication == -1)
920: options->rsa_authentication = 1;
1.50 markus 921: if (options->pubkey_authentication == -1)
922: options->pubkey_authentication = 1;
1.78 markus 923: if (options->challenge_response_authentication == -1)
1.83 markus 924: options->challenge_response_authentication = 1;
1.118 markus 925: if (options->gss_authentication == -1)
1.122 markus 926: options->gss_authentication = 0;
1.118 markus 927: if (options->gss_deleg_creds == -1)
928: options->gss_deleg_creds = 0;
1.17 markus 929: if (options->password_authentication == -1)
930: options->password_authentication = 1;
1.48 markus 931: if (options->kbd_interactive_authentication == -1)
1.59 markus 932: options->kbd_interactive_authentication = 1;
1.17 markus 933: if (options->rhosts_rsa_authentication == -1)
1.99 stevesk 934: options->rhosts_rsa_authentication = 0;
1.72 markus 935: if (options->hostbased_authentication == -1)
936: options->hostbased_authentication = 0;
1.17 markus 937: if (options->batch_mode == -1)
938: options->batch_mode = 0;
939: if (options->check_host_ip == -1)
940: options->check_host_ip = 1;
941: if (options->strict_host_key_checking == -1)
942: options->strict_host_key_checking = 2; /* 2 is default */
943: if (options->compression == -1)
944: options->compression = 0;
1.126 markus 945: if (options->tcp_keep_alive == -1)
946: options->tcp_keep_alive = 1;
1.17 markus 947: if (options->compression_level == -1)
948: options->compression_level = 6;
949: if (options->port == -1)
950: options->port = 0; /* Filled in ssh_connect. */
1.114 djm 951: if (options->address_family == -1)
952: options->address_family = AF_UNSPEC;
1.17 markus 953: if (options->connection_attempts == -1)
1.84 markus 954: options->connection_attempts = 1;
1.17 markus 955: if (options->number_of_password_prompts == -1)
956: options->number_of_password_prompts = 3;
957: /* Selected in ssh_login(). */
958: if (options->cipher == -1)
959: options->cipher = SSH_CIPHER_NOT_SET;
1.31 markus 960: /* options->ciphers, default set in myproposals.h */
1.62 markus 961: /* options->macs, default set in myproposals.h */
1.76 markus 962: /* options->hostkeyalgorithms, default set in myproposals.h */
1.25 markus 963: if (options->protocol == SSH_PROTO_UNKNOWN)
1.69 markus 964: options->protocol = SSH_PROTO_1|SSH_PROTO_2;
1.17 markus 965: if (options->num_identity_files == 0) {
1.50 markus 966: if (options->protocol & SSH_PROTO_1) {
1.61 deraadt 967: len = 2 + strlen(_PATH_SSH_CLIENT_IDENTITY) + 1;
1.50 markus 968: options->identity_files[options->num_identity_files] =
1.61 deraadt 969: xmalloc(len);
970: snprintf(options->identity_files[options->num_identity_files++],
971: len, "~/%.100s", _PATH_SSH_CLIENT_IDENTITY);
1.50 markus 972: }
973: if (options->protocol & SSH_PROTO_2) {
1.63 deraadt 974: len = 2 + strlen(_PATH_SSH_CLIENT_ID_RSA) + 1;
975: options->identity_files[options->num_identity_files] =
976: xmalloc(len);
977: snprintf(options->identity_files[options->num_identity_files++],
978: len, "~/%.100s", _PATH_SSH_CLIENT_ID_RSA);
979:
1.61 deraadt 980: len = 2 + strlen(_PATH_SSH_CLIENT_ID_DSA) + 1;
1.50 markus 981: options->identity_files[options->num_identity_files] =
1.61 deraadt 982: xmalloc(len);
983: snprintf(options->identity_files[options->num_identity_files++],
984: len, "~/%.100s", _PATH_SSH_CLIENT_ID_DSA);
1.50 markus 985: }
1.27 markus 986: }
1.17 markus 987: if (options->escape_char == -1)
988: options->escape_char = '~';
989: if (options->system_hostfile == NULL)
1.55 markus 990: options->system_hostfile = _PATH_SSH_SYSTEM_HOSTFILE;
1.17 markus 991: if (options->user_hostfile == NULL)
1.55 markus 992: options->user_hostfile = _PATH_SSH_USER_HOSTFILE;
1.27 markus 993: if (options->system_hostfile2 == NULL)
1.55 markus 994: options->system_hostfile2 = _PATH_SSH_SYSTEM_HOSTFILE2;
1.27 markus 995: if (options->user_hostfile2 == NULL)
1.55 markus 996: options->user_hostfile2 = _PATH_SSH_USER_HOSTFILE2;
1.95 markus 997: if (options->log_level == SYSLOG_LEVEL_NOT_SET)
1.54 markus 998: options->log_level = SYSLOG_LEVEL_INFO;
1.90 stevesk 999: if (options->clear_forwardings == 1)
1000: clear_forwardings(options);
1.91 markus 1001: if (options->no_host_authentication_for_localhost == - 1)
1002: options->no_host_authentication_for_localhost = 0;
1.128 markus 1003: if (options->identities_only == -1)
1004: options->identities_only = 0;
1.101 markus 1005: if (options->enable_ssh_keysign == -1)
1006: options->enable_ssh_keysign = 0;
1.105 markus 1007: if (options->rekey_limit == -1)
1008: options->rekey_limit = 0;
1.107 jakob 1009: if (options->verify_host_key_dns == -1)
1010: options->verify_host_key_dns = 0;
1.127 markus 1011: if (options->server_alive_interval == -1)
1012: options->server_alive_interval = 0;
1013: if (options->server_alive_count_max == -1)
1014: options->server_alive_count_max = 3;
1.17 markus 1015: /* options->proxy_command should not be set by default */
1016: /* options->user will be set in the main program if appropriate */
1017: /* options->hostname will be set in the main program if appropriate */
1.52 markus 1018: /* options->host_key_alias should not be set by default */
1.67 markus 1019: /* options->preferred_authentications will be set in ssh */
1.1 deraadt 1020: }
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