Annotation of src/usr.bin/ssh/readconf.c, Revision 1.133
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"
1.133 ! djm 15: RCSID("$OpenBSD: readconf.c,v 1.132 2004/06/13 15:03:02 djm 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,
1.132 djm 109: oSendEnv, oControlPath, oControlMaster,
1.110 jakob 110: oDeprecated, oUnsupported
1.1 deraadt 111: } OpCodes;
112:
113: /* Textual representations of the tokens. */
114:
1.17 markus 115: static struct {
116: const char *name;
117: OpCodes opcode;
118: } keywords[] = {
119: { "forwardagent", oForwardAgent },
120: { "forwardx11", oForwardX11 },
1.123 markus 121: { "forwardx11trusted", oForwardX11Trusted },
1.34 markus 122: { "xauthlocation", oXAuthLocation },
1.17 markus 123: { "gatewayports", oGatewayPorts },
124: { "useprivilegedport", oUsePrivilegedPort },
1.116 markus 125: { "rhostsauthentication", oDeprecated },
1.17 markus 126: { "passwordauthentication", oPasswordAuthentication },
1.48 markus 127: { "kbdinteractiveauthentication", oKbdInteractiveAuthentication },
128: { "kbdinteractivedevices", oKbdInteractiveDevices },
1.17 markus 129: { "rsaauthentication", oRSAAuthentication },
1.50 markus 130: { "pubkeyauthentication", oPubkeyAuthentication },
1.59 markus 131: { "dsaauthentication", oPubkeyAuthentication }, /* alias */
1.72 markus 132: { "rhostsrsaauthentication", oRhostsRSAAuthentication },
1.73 markus 133: { "hostbasedauthentication", oHostbasedAuthentication },
1.59 markus 134: { "challengeresponseauthentication", oChallengeResponseAuthentication },
135: { "skeyauthentication", oChallengeResponseAuthentication }, /* alias */
136: { "tisauthentication", oChallengeResponseAuthentication }, /* alias */
1.110 jakob 137: { "kerberosauthentication", oUnsupported },
138: { "kerberostgtpassing", oUnsupported },
139: { "afstokenpassing", oUnsupported },
1.118 markus 140: #if defined(GSSAPI)
141: { "gssapiauthentication", oGssAuthentication },
142: { "gssapidelegatecredentials", oGssDelegateCreds },
143: #else
144: { "gssapiauthentication", oUnsupported },
145: { "gssapidelegatecredentials", oUnsupported },
146: #endif
1.96 markus 147: { "fallbacktorsh", oDeprecated },
148: { "usersh", oDeprecated },
1.17 markus 149: { "identityfile", oIdentityFile },
1.50 markus 150: { "identityfile2", oIdentityFile }, /* alias */
1.128 markus 151: { "identitiesonly", oIdentitiesOnly },
1.17 markus 152: { "hostname", oHostName },
1.52 markus 153: { "hostkeyalias", oHostKeyAlias },
1.17 markus 154: { "proxycommand", oProxyCommand },
155: { "port", oPort },
156: { "cipher", oCipher },
1.25 markus 157: { "ciphers", oCiphers },
1.62 markus 158: { "macs", oMacs },
1.25 markus 159: { "protocol", oProtocol },
1.17 markus 160: { "remoteforward", oRemoteForward },
161: { "localforward", oLocalForward },
162: { "user", oUser },
163: { "host", oHost },
164: { "escapechar", oEscapeChar },
165: { "globalknownhostsfile", oGlobalKnownHostsFile },
1.81 markus 166: { "userknownhostsfile", oUserKnownHostsFile }, /* obsolete */
1.27 markus 167: { "globalknownhostsfile2", oGlobalKnownHostsFile2 },
1.81 markus 168: { "userknownhostsfile2", oUserKnownHostsFile2 }, /* obsolete */
1.17 markus 169: { "connectionattempts", oConnectionAttempts },
170: { "batchmode", oBatchMode },
171: { "checkhostip", oCheckHostIP },
172: { "stricthostkeychecking", oStrictHostKeyChecking },
173: { "compression", oCompression },
174: { "compressionlevel", oCompressionLevel },
1.126 markus 175: { "tcpkeepalive", oTCPKeepAlive },
176: { "keepalive", oTCPKeepAlive }, /* obsolete */
1.17 markus 177: { "numberofpasswordprompts", oNumberOfPasswordPrompts },
178: { "loglevel", oLogLevel },
1.71 markus 179: { "dynamicforward", oDynamicForward },
1.67 markus 180: { "preferredauthentications", oPreferredAuthentications },
1.76 markus 181: { "hostkeyalgorithms", oHostKeyAlgorithms },
1.77 markus 182: { "bindaddress", oBindAddress },
1.110 jakob 183: #ifdef SMARTCARD
1.85 jakob 184: { "smartcarddevice", oSmartcardDevice },
1.110 jakob 185: #else
186: { "smartcarddevice", oUnsupported },
187: #endif
1.93 deraadt 188: { "clearallforwardings", oClearAllForwardings },
1.101 markus 189: { "enablesshkeysign", oEnableSSHKeysign },
1.107 jakob 190: { "verifyhostkeydns", oVerifyHostKeyDNS },
1.93 deraadt 191: { "nohostauthenticationforlocalhost", oNoHostAuthenticationForLocalhost },
1.105 markus 192: { "rekeylimit", oRekeyLimit },
1.111 djm 193: { "connecttimeout", oConnectTimeout },
1.112 djm 194: { "addressfamily", oAddressFamily },
1.127 markus 195: { "serveraliveinterval", oServerAliveInterval },
196: { "serveralivecountmax", oServerAliveCountMax },
1.130 djm 197: { "sendenv", oSendEnv },
1.132 djm 198: { "controlpath", oControlPath },
199: { "controlmaster", oControlMaster },
1.92 stevesk 200: { NULL, oBadOption }
1.13 markus 201: };
202:
1.19 markus 203: /*
204: * Adds a local TCP/IP port forward to options. Never returns if there is an
205: * error.
206: */
1.1 deraadt 207:
1.26 markus 208: void
1.22 markus 209: add_local_forward(Options *options, u_short port, const char *host,
210: u_short host_port)
1.1 deraadt 211: {
1.17 markus 212: Forward *fwd;
213: extern uid_t original_real_uid;
214: if (port < IPPORT_RESERVED && original_real_uid != 0)
1.64 millert 215: fatal("Privileged ports can only be forwarded by root.");
1.17 markus 216: if (options->num_local_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
217: fatal("Too many local forwards (max %d).", SSH_MAX_FORWARDS_PER_DIRECTION);
218: fwd = &options->local_forwards[options->num_local_forwards++];
219: fwd->port = port;
220: fwd->host = xstrdup(host);
221: fwd->host_port = host_port;
1.1 deraadt 222: }
223:
1.19 markus 224: /*
225: * Adds a remote TCP/IP port forward to options. Never returns if there is
226: * an error.
227: */
1.1 deraadt 228:
1.26 markus 229: void
1.22 markus 230: add_remote_forward(Options *options, u_short port, const char *host,
231: u_short host_port)
1.1 deraadt 232: {
1.17 markus 233: Forward *fwd;
234: if (options->num_remote_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
235: fatal("Too many remote forwards (max %d).",
1.93 deraadt 236: SSH_MAX_FORWARDS_PER_DIRECTION);
1.17 markus 237: fwd = &options->remote_forwards[options->num_remote_forwards++];
238: fwd->port = port;
239: fwd->host = xstrdup(host);
240: fwd->host_port = host_port;
1.1 deraadt 241: }
242:
1.90 stevesk 243: static void
244: clear_forwardings(Options *options)
245: {
246: int i;
247:
248: for (i = 0; i < options->num_local_forwards; i++)
249: xfree(options->local_forwards[i].host);
250: options->num_local_forwards = 0;
251: for (i = 0; i < options->num_remote_forwards; i++)
252: xfree(options->remote_forwards[i].host);
253: options->num_remote_forwards = 0;
254: }
255:
1.19 markus 256: /*
1.70 stevesk 257: * Returns the number of the token pointed to by cp or oBadOption.
1.19 markus 258: */
1.1 deraadt 259:
1.26 markus 260: static OpCodes
1.17 markus 261: parse_token(const char *cp, const char *filename, int linenum)
1.1 deraadt 262: {
1.51 markus 263: u_int i;
1.1 deraadt 264:
1.17 markus 265: for (i = 0; keywords[i].name; i++)
1.20 markus 266: if (strcasecmp(cp, keywords[i].name) == 0)
1.17 markus 267: return keywords[i].opcode;
268:
1.75 stevesk 269: error("%s: line %d: Bad configuration option: %s",
270: filename, linenum, cp);
1.17 markus 271: return oBadOption;
1.1 deraadt 272: }
273:
1.19 markus 274: /*
275: * Processes a single option line as used in the configuration files. This
276: * only sets those values that have not already been set.
277: */
1.102 markus 278: #define WHITESPACE " \t\r\n"
1.1 deraadt 279:
1.14 markus 280: int
281: process_config_line(Options *options, const char *host,
1.17 markus 282: char *line, const char *filename, int linenum,
283: int *activep)
1.1 deraadt 284: {
1.102 markus 285: char buf[256], *s, **charptr, *endofnumber, *keyword, *arg;
1.22 markus 286: int opcode, *intptr, value;
1.102 markus 287: size_t len;
1.22 markus 288: u_short fwd_port, fwd_host_port;
1.88 stevesk 289: char sfwd_host_port[6];
1.106 djm 290:
291: /* Strip trailing whitespace */
292: for(len = strlen(line) - 1; len > 0; len--) {
293: if (strchr(WHITESPACE, line[len]) == NULL)
294: break;
295: line[len] = '\0';
296: }
1.1 deraadt 297:
1.42 provos 298: s = line;
299: /* Get the keyword. (Each line is supposed to begin with a keyword). */
300: keyword = strdelim(&s);
301: /* Ignore leading whitespace. */
302: if (*keyword == '\0')
1.43 markus 303: keyword = strdelim(&s);
1.56 deraadt 304: if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#')
1.17 markus 305: return 0;
306:
1.38 provos 307: opcode = parse_token(keyword, filename, linenum);
1.17 markus 308:
309: switch (opcode) {
310: case oBadOption:
1.19 markus 311: /* don't panic, but count bad options */
312: return -1;
1.17 markus 313: /* NOTREACHED */
1.111 djm 314: case oConnectTimeout:
315: intptr = &options->connection_timeout;
1.127 markus 316: parse_time:
1.111 djm 317: arg = strdelim(&s);
318: if (!arg || *arg == '\0')
319: fatal("%s line %d: missing time value.",
320: filename, linenum);
321: if ((value = convtime(arg)) == -1)
322: fatal("%s line %d: invalid time value.",
323: filename, linenum);
324: if (*intptr == -1)
325: *intptr = value;
326: break;
327:
1.17 markus 328: case oForwardAgent:
329: intptr = &options->forward_agent;
330: parse_flag:
1.42 provos 331: arg = strdelim(&s);
1.40 ho 332: if (!arg || *arg == '\0')
1.17 markus 333: fatal("%.200s line %d: Missing yes/no argument.", filename, linenum);
334: value = 0; /* To avoid compiler warning... */
1.38 provos 335: if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
1.17 markus 336: value = 1;
1.38 provos 337: else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
1.17 markus 338: value = 0;
339: else
340: fatal("%.200s line %d: Bad yes/no argument.", filename, linenum);
341: if (*activep && *intptr == -1)
342: *intptr = value;
343: break;
344:
345: case oForwardX11:
346: intptr = &options->forward_x11;
347: goto parse_flag;
348:
1.123 markus 349: case oForwardX11Trusted:
350: intptr = &options->forward_x11_trusted;
351: goto parse_flag;
352:
1.17 markus 353: case oGatewayPorts:
354: intptr = &options->gateway_ports;
355: goto parse_flag;
356:
357: case oUsePrivilegedPort:
358: intptr = &options->use_privileged_port;
359: goto parse_flag;
360:
361: case oPasswordAuthentication:
362: intptr = &options->password_authentication;
363: goto parse_flag;
364:
1.48 markus 365: case oKbdInteractiveAuthentication:
366: intptr = &options->kbd_interactive_authentication;
367: goto parse_flag;
368:
369: case oKbdInteractiveDevices:
370: charptr = &options->kbd_interactive_devices;
371: goto parse_string;
372:
1.50 markus 373: case oPubkeyAuthentication:
374: intptr = &options->pubkey_authentication;
1.30 markus 375: goto parse_flag;
376:
1.17 markus 377: case oRSAAuthentication:
378: intptr = &options->rsa_authentication;
379: goto parse_flag;
380:
381: case oRhostsRSAAuthentication:
382: intptr = &options->rhosts_rsa_authentication;
383: goto parse_flag;
384:
1.72 markus 385: case oHostbasedAuthentication:
386: intptr = &options->hostbased_authentication;
387: goto parse_flag;
388:
1.59 markus 389: case oChallengeResponseAuthentication:
1.78 markus 390: intptr = &options->challenge_response_authentication;
1.17 markus 391: goto parse_flag;
1.108 jakob 392:
1.118 markus 393: case oGssAuthentication:
394: intptr = &options->gss_authentication;
395: goto parse_flag;
396:
397: case oGssDelegateCreds:
398: intptr = &options->gss_deleg_creds;
399: goto parse_flag;
400:
1.17 markus 401: case oBatchMode:
402: intptr = &options->batch_mode;
403: goto parse_flag;
404:
405: case oCheckHostIP:
406: intptr = &options->check_host_ip;
407: goto parse_flag;
408:
1.107 jakob 409: case oVerifyHostKeyDNS:
410: intptr = &options->verify_host_key_dns;
1.125 jakob 411: goto parse_yesnoask;
1.107 jakob 412:
1.17 markus 413: case oStrictHostKeyChecking:
414: intptr = &options->strict_host_key_checking;
1.125 jakob 415: parse_yesnoask:
1.42 provos 416: arg = strdelim(&s);
1.40 ho 417: if (!arg || *arg == '\0')
1.60 stevesk 418: fatal("%.200s line %d: Missing yes/no/ask argument.",
1.93 deraadt 419: filename, linenum);
1.17 markus 420: value = 0; /* To avoid compiler warning... */
1.38 provos 421: if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
1.17 markus 422: value = 1;
1.38 provos 423: else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
1.17 markus 424: value = 0;
1.38 provos 425: else if (strcmp(arg, "ask") == 0)
1.17 markus 426: value = 2;
427: else
428: fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum);
429: if (*activep && *intptr == -1)
430: *intptr = value;
431: break;
432:
433: case oCompression:
434: intptr = &options->compression;
435: goto parse_flag;
436:
1.126 markus 437: case oTCPKeepAlive:
438: intptr = &options->tcp_keep_alive;
1.17 markus 439: goto parse_flag;
440:
1.91 markus 441: case oNoHostAuthenticationForLocalhost:
442: intptr = &options->no_host_authentication_for_localhost;
443: goto parse_flag;
444:
1.17 markus 445: case oNumberOfPasswordPrompts:
446: intptr = &options->number_of_password_prompts;
447: goto parse_int;
448:
449: case oCompressionLevel:
450: intptr = &options->compression_level;
451: goto parse_int;
452:
1.105 markus 453: case oRekeyLimit:
454: intptr = &options->rekey_limit;
455: arg = strdelim(&s);
456: if (!arg || *arg == '\0')
457: fatal("%.200s line %d: Missing argument.", filename, linenum);
458: if (arg[0] < '0' || arg[0] > '9')
459: fatal("%.200s line %d: Bad number.", filename, linenum);
460: value = strtol(arg, &endofnumber, 10);
461: if (arg == endofnumber)
462: fatal("%.200s line %d: Bad number.", filename, linenum);
463: switch (toupper(*endofnumber)) {
464: case 'K':
465: value *= 1<<10;
466: break;
467: case 'M':
468: value *= 1<<20;
469: break;
470: case 'G':
471: value *= 1<<30;
472: break;
473: }
474: if (*activep && *intptr == -1)
475: *intptr = value;
476: break;
477:
1.17 markus 478: case oIdentityFile:
1.42 provos 479: arg = strdelim(&s);
1.40 ho 480: if (!arg || *arg == '\0')
1.17 markus 481: fatal("%.200s line %d: Missing argument.", filename, linenum);
482: if (*activep) {
1.50 markus 483: intptr = &options->num_identity_files;
1.27 markus 484: if (*intptr >= SSH_MAX_IDENTITY_FILES)
1.17 markus 485: fatal("%.200s line %d: Too many identity files specified (max %d).",
1.93 deraadt 486: filename, linenum, SSH_MAX_IDENTITY_FILES);
1.50 markus 487: charptr = &options->identity_files[*intptr];
1.38 provos 488: *charptr = xstrdup(arg);
1.27 markus 489: *intptr = *intptr + 1;
1.17 markus 490: }
491: break;
492:
1.34 markus 493: case oXAuthLocation:
494: charptr=&options->xauth_location;
495: goto parse_string;
496:
1.17 markus 497: case oUser:
498: charptr = &options->user;
499: parse_string:
1.42 provos 500: arg = strdelim(&s);
1.40 ho 501: if (!arg || *arg == '\0')
1.17 markus 502: fatal("%.200s line %d: Missing argument.", filename, linenum);
503: if (*activep && *charptr == NULL)
1.38 provos 504: *charptr = xstrdup(arg);
1.17 markus 505: break;
506:
507: case oGlobalKnownHostsFile:
508: charptr = &options->system_hostfile;
509: goto parse_string;
510:
511: case oUserKnownHostsFile:
512: charptr = &options->user_hostfile;
513: goto parse_string;
514:
1.27 markus 515: case oGlobalKnownHostsFile2:
516: charptr = &options->system_hostfile2;
517: goto parse_string;
518:
519: case oUserKnownHostsFile2:
520: charptr = &options->user_hostfile2;
521: goto parse_string;
522:
1.17 markus 523: case oHostName:
524: charptr = &options->hostname;
525: goto parse_string;
526:
1.52 markus 527: case oHostKeyAlias:
528: charptr = &options->host_key_alias;
529: goto parse_string;
530:
1.67 markus 531: case oPreferredAuthentications:
532: charptr = &options->preferred_authentications;
533: goto parse_string;
534:
1.77 markus 535: case oBindAddress:
536: charptr = &options->bind_address;
537: goto parse_string;
538:
1.85 jakob 539: case oSmartcardDevice:
1.86 markus 540: charptr = &options->smartcard_device;
541: goto parse_string;
1.85 jakob 542:
1.17 markus 543: case oProxyCommand:
1.113 markus 544: if (s == NULL)
545: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.17 markus 546: charptr = &options->proxy_command;
1.102 markus 547: len = strspn(s, WHITESPACE "=");
1.17 markus 548: if (*activep && *charptr == NULL)
1.102 markus 549: *charptr = xstrdup(s + len);
1.17 markus 550: return 0;
551:
552: case oPort:
553: intptr = &options->port;
554: parse_int:
1.42 provos 555: arg = strdelim(&s);
1.40 ho 556: if (!arg || *arg == '\0')
1.17 markus 557: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 558: if (arg[0] < '0' || arg[0] > '9')
1.17 markus 559: fatal("%.200s line %d: Bad number.", filename, linenum);
1.21 markus 560:
561: /* Octal, decimal, or hex format? */
1.38 provos 562: value = strtol(arg, &endofnumber, 0);
563: if (arg == endofnumber)
1.21 markus 564: fatal("%.200s line %d: Bad number.", filename, linenum);
1.17 markus 565: if (*activep && *intptr == -1)
566: *intptr = value;
567: break;
568:
569: case oConnectionAttempts:
570: intptr = &options->connection_attempts;
571: goto parse_int;
572:
573: case oCipher:
574: intptr = &options->cipher;
1.42 provos 575: arg = strdelim(&s);
1.40 ho 576: if (!arg || *arg == '\0')
1.32 markus 577: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 578: value = cipher_number(arg);
1.17 markus 579: if (value == -1)
580: fatal("%.200s line %d: Bad cipher '%s'.",
1.93 deraadt 581: filename, linenum, arg ? arg : "<NONE>");
1.17 markus 582: if (*activep && *intptr == -1)
583: *intptr = value;
584: break;
585:
1.25 markus 586: case oCiphers:
1.42 provos 587: arg = strdelim(&s);
1.40 ho 588: if (!arg || *arg == '\0')
1.32 markus 589: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 590: if (!ciphers_valid(arg))
1.31 markus 591: fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.",
1.93 deraadt 592: filename, linenum, arg ? arg : "<NONE>");
1.25 markus 593: if (*activep && options->ciphers == NULL)
1.38 provos 594: options->ciphers = xstrdup(arg);
1.25 markus 595: break;
596:
1.62 markus 597: case oMacs:
598: arg = strdelim(&s);
599: if (!arg || *arg == '\0')
600: fatal("%.200s line %d: Missing argument.", filename, linenum);
601: if (!mac_valid(arg))
602: fatal("%.200s line %d: Bad SSH2 Mac spec '%s'.",
1.93 deraadt 603: filename, linenum, arg ? arg : "<NONE>");
1.62 markus 604: if (*activep && options->macs == NULL)
605: options->macs = xstrdup(arg);
606: break;
607:
1.76 markus 608: case oHostKeyAlgorithms:
609: arg = strdelim(&s);
610: if (!arg || *arg == '\0')
611: fatal("%.200s line %d: Missing argument.", filename, linenum);
612: if (!key_names_valid2(arg))
613: fatal("%.200s line %d: Bad protocol 2 host key algorithms '%s'.",
1.93 deraadt 614: filename, linenum, arg ? arg : "<NONE>");
1.76 markus 615: if (*activep && options->hostkeyalgorithms == NULL)
616: options->hostkeyalgorithms = xstrdup(arg);
617: break;
618:
1.25 markus 619: case oProtocol:
620: intptr = &options->protocol;
1.42 provos 621: arg = strdelim(&s);
1.40 ho 622: if (!arg || *arg == '\0')
1.32 markus 623: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 624: value = proto_spec(arg);
1.25 markus 625: if (value == SSH_PROTO_UNKNOWN)
626: fatal("%.200s line %d: Bad protocol spec '%s'.",
1.93 deraadt 627: filename, linenum, arg ? arg : "<NONE>");
1.25 markus 628: if (*activep && *intptr == SSH_PROTO_UNKNOWN)
629: *intptr = value;
630: break;
631:
1.17 markus 632: case oLogLevel:
633: intptr = (int *) &options->log_level;
1.42 provos 634: arg = strdelim(&s);
1.38 provos 635: value = log_level_number(arg);
1.95 markus 636: if (value == SYSLOG_LEVEL_NOT_SET)
1.64 millert 637: fatal("%.200s line %d: unsupported log level '%s'",
1.93 deraadt 638: filename, linenum, arg ? arg : "<NONE>");
1.95 markus 639: if (*activep && (LogLevel) *intptr == SYSLOG_LEVEL_NOT_SET)
1.17 markus 640: *intptr = (LogLevel) value;
641: break;
642:
1.88 stevesk 643: case oLocalForward:
1.17 markus 644: case oRemoteForward:
1.42 provos 645: arg = strdelim(&s);
1.40 ho 646: if (!arg || *arg == '\0')
1.88 stevesk 647: fatal("%.200s line %d: Missing port argument.",
648: filename, linenum);
649: if ((fwd_port = a2port(arg)) == 0)
650: fatal("%.200s line %d: Bad listen port.",
651: filename, linenum);
1.42 provos 652: arg = strdelim(&s);
1.40 ho 653: if (!arg || *arg == '\0')
1.17 markus 654: fatal("%.200s line %d: Missing second argument.",
1.88 stevesk 655: filename, linenum);
656: if (sscanf(arg, "%255[^:]:%5[0-9]", buf, sfwd_host_port) != 2 &&
657: sscanf(arg, "%255[^/]/%5[0-9]", buf, sfwd_host_port) != 2)
658: fatal("%.200s line %d: Bad forwarding specification.",
659: filename, linenum);
660: if ((fwd_host_port = a2port(sfwd_host_port)) == 0)
661: fatal("%.200s line %d: Bad forwarding port.",
662: filename, linenum);
663: if (*activep) {
664: if (opcode == oLocalForward)
665: add_local_forward(options, fwd_port, buf,
666: fwd_host_port);
667: else if (opcode == oRemoteForward)
668: add_remote_forward(options, fwd_port, buf,
669: fwd_host_port);
670: }
1.17 markus 671: break;
1.71 markus 672:
673: case oDynamicForward:
674: arg = strdelim(&s);
675: if (!arg || *arg == '\0')
676: fatal("%.200s line %d: Missing port argument.",
677: filename, linenum);
1.74 stevesk 678: fwd_port = a2port(arg);
679: if (fwd_port == 0)
1.71 markus 680: fatal("%.200s line %d: Badly formatted port number.",
681: filename, linenum);
1.87 markus 682: if (*activep)
1.117 markus 683: add_local_forward(options, fwd_port, "socks", 0);
1.72 markus 684: break;
1.17 markus 685:
1.90 stevesk 686: case oClearAllForwardings:
687: intptr = &options->clear_forwardings;
688: goto parse_flag;
689:
1.17 markus 690: case oHost:
691: *activep = 0;
1.42 provos 692: while ((arg = strdelim(&s)) != NULL && *arg != '\0')
1.38 provos 693: if (match_pattern(host, arg)) {
694: debug("Applying options for %.100s", arg);
1.17 markus 695: *activep = 1;
696: break;
697: }
1.42 provos 698: /* Avoid garbage check below, as strdelim is done. */
1.17 markus 699: return 0;
700:
701: case oEscapeChar:
702: intptr = &options->escape_char;
1.42 provos 703: arg = strdelim(&s);
1.40 ho 704: if (!arg || *arg == '\0')
1.17 markus 705: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 706: if (arg[0] == '^' && arg[2] == 0 &&
1.51 markus 707: (u_char) arg[1] >= 64 && (u_char) arg[1] < 128)
708: value = (u_char) arg[1] & 31;
1.38 provos 709: else if (strlen(arg) == 1)
1.51 markus 710: value = (u_char) arg[0];
1.38 provos 711: else if (strcmp(arg, "none") == 0)
1.79 stevesk 712: value = SSH_ESCAPECHAR_NONE;
1.17 markus 713: else {
714: fatal("%.200s line %d: Bad escape character.",
1.93 deraadt 715: filename, linenum);
1.17 markus 716: /* NOTREACHED */
717: value = 0; /* Avoid compiler warning. */
718: }
719: if (*activep && *intptr == -1)
720: *intptr = value;
1.112 djm 721: break;
722:
723: case oAddressFamily:
724: arg = strdelim(&s);
1.114 djm 725: intptr = &options->address_family;
1.112 djm 726: if (strcasecmp(arg, "inet") == 0)
1.114 djm 727: value = AF_INET;
1.112 djm 728: else if (strcasecmp(arg, "inet6") == 0)
1.114 djm 729: value = AF_INET6;
1.112 djm 730: else if (strcasecmp(arg, "any") == 0)
1.114 djm 731: value = AF_UNSPEC;
1.112 djm 732: else
733: fatal("Unsupported AddressFamily \"%s\"", arg);
1.114 djm 734: if (*activep && *intptr == -1)
735: *intptr = value;
1.17 markus 736: break;
737:
1.101 markus 738: case oEnableSSHKeysign:
739: intptr = &options->enable_ssh_keysign;
740: goto parse_flag;
741:
1.128 markus 742: case oIdentitiesOnly:
743: intptr = &options->identities_only;
744: goto parse_flag;
745:
1.127 markus 746: case oServerAliveInterval:
747: intptr = &options->server_alive_interval;
748: goto parse_time;
749:
750: case oServerAliveCountMax:
751: intptr = &options->server_alive_count_max;
752: goto parse_int;
753:
1.130 djm 754: case oSendEnv:
755: while ((arg = strdelim(&s)) != NULL && *arg != '\0') {
756: if (strchr(arg, '=') != NULL)
757: fatal("%s line %d: Invalid environment name.",
758: filename, linenum);
759: if (options->num_send_env >= MAX_SEND_ENV)
760: fatal("%s line %d: too many send env.",
761: filename, linenum);
762: options->send_env[options->num_send_env++] =
763: xstrdup(arg);
764: }
765: break;
766:
1.132 djm 767: case oControlPath:
768: charptr = &options->control_path;
769: goto parse_string;
770:
771: case oControlMaster:
772: intptr = &options->control_master;
1.133 ! djm 773: goto parse_yesnoask;
1.132 djm 774:
1.96 markus 775: case oDeprecated:
1.98 markus 776: debug("%s line %d: Deprecated option \"%s\"",
1.96 markus 777: filename, linenum, keyword);
1.98 markus 778: return 0;
1.96 markus 779:
1.110 jakob 780: case oUnsupported:
781: error("%s line %d: Unsupported option \"%s\"",
782: filename, linenum, keyword);
783: return 0;
784:
1.17 markus 785: default:
786: fatal("process_config_line: Unimplemented opcode %d", opcode);
787: }
788:
789: /* Check that there is no garbage at end of line. */
1.57 djm 790: if ((arg = strdelim(&s)) != NULL && *arg != '\0') {
1.39 ho 791: fatal("%.200s line %d: garbage at end of line; \"%.200s\".",
1.93 deraadt 792: filename, linenum, arg);
1.39 ho 793: }
1.17 markus 794: return 0;
1.1 deraadt 795: }
796:
797:
1.19 markus 798: /*
799: * Reads the config file and modifies the options accordingly. Options
800: * should already be initialized before this call. This never returns if
1.89 stevesk 801: * there is an error. If the file does not exist, this returns 0.
1.19 markus 802: */
1.1 deraadt 803:
1.89 stevesk 804: int
1.129 djm 805: read_config_file(const char *filename, const char *host, Options *options,
806: int checkperm)
1.1 deraadt 807: {
1.17 markus 808: FILE *f;
809: char line[1024];
810: int active, linenum;
811: int bad_options = 0;
812:
813: /* Open the file. */
1.129 djm 814: if ((f = fopen(filename, "r")) == NULL)
1.89 stevesk 815: return 0;
1.129 djm 816:
817: if (checkperm) {
818: struct stat sb;
819:
1.131 dtucker 820: if (fstat(fileno(f), &sb) == -1)
1.129 djm 821: fatal("fstat %s: %s", filename, strerror(errno));
822: if (((sb.st_uid != 0 && sb.st_uid != getuid()) ||
1.131 dtucker 823: (sb.st_mode & 022) != 0))
1.129 djm 824: fatal("Bad owner or permissions on %s", filename);
825: }
1.17 markus 826:
827: debug("Reading configuration data %.200s", filename);
828:
1.19 markus 829: /*
830: * Mark that we are now processing the options. This flag is turned
831: * on/off by Host specifications.
832: */
1.17 markus 833: active = 1;
834: linenum = 0;
835: while (fgets(line, sizeof(line), f)) {
836: /* Update line number counter. */
837: linenum++;
838: if (process_config_line(options, host, line, filename, linenum, &active) != 0)
839: bad_options++;
840: }
841: fclose(f);
842: if (bad_options > 0)
1.64 millert 843: fatal("%s: terminating, %d bad configuration options",
1.93 deraadt 844: filename, bad_options);
1.89 stevesk 845: return 1;
1.1 deraadt 846: }
847:
1.19 markus 848: /*
849: * Initializes options to special values that indicate that they have not yet
850: * been set. Read_config_file will only set options with this value. Options
851: * are processed in the following order: command line, user config file,
852: * system config file. Last, fill_default_options is called.
853: */
1.1 deraadt 854:
1.26 markus 855: void
1.17 markus 856: initialize_options(Options * options)
1.1 deraadt 857: {
1.17 markus 858: memset(options, 'X', sizeof(*options));
859: options->forward_agent = -1;
860: options->forward_x11 = -1;
1.123 markus 861: options->forward_x11_trusted = -1;
1.34 markus 862: options->xauth_location = NULL;
1.17 markus 863: options->gateway_ports = -1;
864: options->use_privileged_port = -1;
865: options->rsa_authentication = -1;
1.50 markus 866: options->pubkey_authentication = -1;
1.78 markus 867: options->challenge_response_authentication = -1;
1.118 markus 868: options->gss_authentication = -1;
869: options->gss_deleg_creds = -1;
1.17 markus 870: options->password_authentication = -1;
1.48 markus 871: options->kbd_interactive_authentication = -1;
872: options->kbd_interactive_devices = NULL;
1.17 markus 873: options->rhosts_rsa_authentication = -1;
1.72 markus 874: options->hostbased_authentication = -1;
1.17 markus 875: options->batch_mode = -1;
876: options->check_host_ip = -1;
877: options->strict_host_key_checking = -1;
878: options->compression = -1;
1.126 markus 879: options->tcp_keep_alive = -1;
1.17 markus 880: options->compression_level = -1;
881: options->port = -1;
1.114 djm 882: options->address_family = -1;
1.17 markus 883: options->connection_attempts = -1;
1.111 djm 884: options->connection_timeout = -1;
1.17 markus 885: options->number_of_password_prompts = -1;
886: options->cipher = -1;
1.25 markus 887: options->ciphers = NULL;
1.62 markus 888: options->macs = NULL;
1.76 markus 889: options->hostkeyalgorithms = NULL;
1.25 markus 890: options->protocol = SSH_PROTO_UNKNOWN;
1.17 markus 891: options->num_identity_files = 0;
892: options->hostname = NULL;
1.52 markus 893: options->host_key_alias = NULL;
1.17 markus 894: options->proxy_command = NULL;
895: options->user = NULL;
896: options->escape_char = -1;
897: options->system_hostfile = NULL;
898: options->user_hostfile = NULL;
1.27 markus 899: options->system_hostfile2 = NULL;
900: options->user_hostfile2 = NULL;
1.17 markus 901: options->num_local_forwards = 0;
902: options->num_remote_forwards = 0;
1.90 stevesk 903: options->clear_forwardings = -1;
1.95 markus 904: options->log_level = SYSLOG_LEVEL_NOT_SET;
1.67 markus 905: options->preferred_authentications = NULL;
1.77 markus 906: options->bind_address = NULL;
1.86 markus 907: options->smartcard_device = NULL;
1.101 markus 908: options->enable_ssh_keysign = - 1;
1.91 markus 909: options->no_host_authentication_for_localhost = - 1;
1.128 markus 910: options->identities_only = - 1;
1.105 markus 911: options->rekey_limit = - 1;
1.107 jakob 912: options->verify_host_key_dns = -1;
1.127 markus 913: options->server_alive_interval = -1;
914: options->server_alive_count_max = -1;
1.130 djm 915: options->num_send_env = 0;
1.132 djm 916: options->control_path = NULL;
917: options->control_master = -1;
1.1 deraadt 918: }
919:
1.19 markus 920: /*
921: * Called after processing other sources of option data, this fills those
922: * options for which no value has been specified with their default values.
923: */
1.1 deraadt 924:
1.26 markus 925: void
1.17 markus 926: fill_default_options(Options * options)
1.1 deraadt 927: {
1.61 deraadt 928: int len;
929:
1.17 markus 930: if (options->forward_agent == -1)
1.33 markus 931: options->forward_agent = 0;
1.17 markus 932: if (options->forward_x11 == -1)
1.23 markus 933: options->forward_x11 = 0;
1.123 markus 934: if (options->forward_x11_trusted == -1)
935: options->forward_x11_trusted = 0;
1.34 markus 936: if (options->xauth_location == NULL)
1.80 markus 937: options->xauth_location = _PATH_XAUTH;
1.17 markus 938: if (options->gateway_ports == -1)
939: options->gateway_ports = 0;
940: if (options->use_privileged_port == -1)
1.65 markus 941: options->use_privileged_port = 0;
1.17 markus 942: if (options->rsa_authentication == -1)
943: options->rsa_authentication = 1;
1.50 markus 944: if (options->pubkey_authentication == -1)
945: options->pubkey_authentication = 1;
1.78 markus 946: if (options->challenge_response_authentication == -1)
1.83 markus 947: options->challenge_response_authentication = 1;
1.118 markus 948: if (options->gss_authentication == -1)
1.122 markus 949: options->gss_authentication = 0;
1.118 markus 950: if (options->gss_deleg_creds == -1)
951: options->gss_deleg_creds = 0;
1.17 markus 952: if (options->password_authentication == -1)
953: options->password_authentication = 1;
1.48 markus 954: if (options->kbd_interactive_authentication == -1)
1.59 markus 955: options->kbd_interactive_authentication = 1;
1.17 markus 956: if (options->rhosts_rsa_authentication == -1)
1.99 stevesk 957: options->rhosts_rsa_authentication = 0;
1.72 markus 958: if (options->hostbased_authentication == -1)
959: options->hostbased_authentication = 0;
1.17 markus 960: if (options->batch_mode == -1)
961: options->batch_mode = 0;
962: if (options->check_host_ip == -1)
963: options->check_host_ip = 1;
964: if (options->strict_host_key_checking == -1)
965: options->strict_host_key_checking = 2; /* 2 is default */
966: if (options->compression == -1)
967: options->compression = 0;
1.126 markus 968: if (options->tcp_keep_alive == -1)
969: options->tcp_keep_alive = 1;
1.17 markus 970: if (options->compression_level == -1)
971: options->compression_level = 6;
972: if (options->port == -1)
973: options->port = 0; /* Filled in ssh_connect. */
1.114 djm 974: if (options->address_family == -1)
975: options->address_family = AF_UNSPEC;
1.17 markus 976: if (options->connection_attempts == -1)
1.84 markus 977: options->connection_attempts = 1;
1.17 markus 978: if (options->number_of_password_prompts == -1)
979: options->number_of_password_prompts = 3;
980: /* Selected in ssh_login(). */
981: if (options->cipher == -1)
982: options->cipher = SSH_CIPHER_NOT_SET;
1.31 markus 983: /* options->ciphers, default set in myproposals.h */
1.62 markus 984: /* options->macs, default set in myproposals.h */
1.76 markus 985: /* options->hostkeyalgorithms, default set in myproposals.h */
1.25 markus 986: if (options->protocol == SSH_PROTO_UNKNOWN)
1.69 markus 987: options->protocol = SSH_PROTO_1|SSH_PROTO_2;
1.17 markus 988: if (options->num_identity_files == 0) {
1.50 markus 989: if (options->protocol & SSH_PROTO_1) {
1.61 deraadt 990: len = 2 + strlen(_PATH_SSH_CLIENT_IDENTITY) + 1;
1.50 markus 991: options->identity_files[options->num_identity_files] =
1.61 deraadt 992: xmalloc(len);
993: snprintf(options->identity_files[options->num_identity_files++],
994: len, "~/%.100s", _PATH_SSH_CLIENT_IDENTITY);
1.50 markus 995: }
996: if (options->protocol & SSH_PROTO_2) {
1.63 deraadt 997: len = 2 + strlen(_PATH_SSH_CLIENT_ID_RSA) + 1;
998: options->identity_files[options->num_identity_files] =
999: xmalloc(len);
1000: snprintf(options->identity_files[options->num_identity_files++],
1001: len, "~/%.100s", _PATH_SSH_CLIENT_ID_RSA);
1002:
1.61 deraadt 1003: len = 2 + strlen(_PATH_SSH_CLIENT_ID_DSA) + 1;
1.50 markus 1004: options->identity_files[options->num_identity_files] =
1.61 deraadt 1005: xmalloc(len);
1006: snprintf(options->identity_files[options->num_identity_files++],
1007: len, "~/%.100s", _PATH_SSH_CLIENT_ID_DSA);
1.50 markus 1008: }
1.27 markus 1009: }
1.17 markus 1010: if (options->escape_char == -1)
1011: options->escape_char = '~';
1012: if (options->system_hostfile == NULL)
1.55 markus 1013: options->system_hostfile = _PATH_SSH_SYSTEM_HOSTFILE;
1.17 markus 1014: if (options->user_hostfile == NULL)
1.55 markus 1015: options->user_hostfile = _PATH_SSH_USER_HOSTFILE;
1.27 markus 1016: if (options->system_hostfile2 == NULL)
1.55 markus 1017: options->system_hostfile2 = _PATH_SSH_SYSTEM_HOSTFILE2;
1.27 markus 1018: if (options->user_hostfile2 == NULL)
1.55 markus 1019: options->user_hostfile2 = _PATH_SSH_USER_HOSTFILE2;
1.95 markus 1020: if (options->log_level == SYSLOG_LEVEL_NOT_SET)
1.54 markus 1021: options->log_level = SYSLOG_LEVEL_INFO;
1.90 stevesk 1022: if (options->clear_forwardings == 1)
1023: clear_forwardings(options);
1.91 markus 1024: if (options->no_host_authentication_for_localhost == - 1)
1025: options->no_host_authentication_for_localhost = 0;
1.128 markus 1026: if (options->identities_only == -1)
1027: options->identities_only = 0;
1.101 markus 1028: if (options->enable_ssh_keysign == -1)
1029: options->enable_ssh_keysign = 0;
1.105 markus 1030: if (options->rekey_limit == -1)
1031: options->rekey_limit = 0;
1.107 jakob 1032: if (options->verify_host_key_dns == -1)
1033: options->verify_host_key_dns = 0;
1.127 markus 1034: if (options->server_alive_interval == -1)
1035: options->server_alive_interval = 0;
1036: if (options->server_alive_count_max == -1)
1037: options->server_alive_count_max = 3;
1.132 djm 1038: if (options->control_master == -1)
1039: options->control_master = 0;
1.17 markus 1040: /* options->proxy_command should not be set by default */
1041: /* options->user will be set in the main program if appropriate */
1042: /* options->hostname will be set in the main program if appropriate */
1.52 markus 1043: /* options->host_key_alias should not be set by default */
1.67 markus 1044: /* options->preferred_authentications will be set in ssh */
1.1 deraadt 1045: }
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