Annotation of src/usr.bin/ssh/readconf.c, Revision 1.125
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"
1.125 ! jakob 15: RCSID("$OpenBSD: readconf.c,v 1.124 2003/10/14 19:42:10 jakob 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,
1.123 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,
1.59 markus 99: oCompressionLevel, oKeepAlives, 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,
1.110 jakob 108: oDeprecated, oUnsupported
1.1 deraadt 109: } OpCodes;
110:
111: /* Textual representations of the tokens. */
112:
1.17 markus 113: static struct {
114: const char *name;
115: OpCodes opcode;
116: } keywords[] = {
117: { "forwardagent", oForwardAgent },
118: { "forwardx11", oForwardX11 },
1.123 markus 119: { "forwardx11trusted", oForwardX11Trusted },
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 },
1.107 jakob 186: { "verifyhostkeydns", oVerifyHostKeyDNS },
1.93 deraadt 187: { "nohostauthenticationforlocalhost", oNoHostAuthenticationForLocalhost },
1.105 markus 188: { "rekeylimit", oRekeyLimit },
1.111 djm 189: { "connecttimeout", oConnectTimeout },
1.112 djm 190: { "addressfamily", oAddressFamily },
1.92 stevesk 191: { NULL, oBadOption }
1.13 markus 192: };
193:
1.19 markus 194: /*
195: * Adds a local TCP/IP port forward to options. Never returns if there is an
196: * error.
197: */
1.1 deraadt 198:
1.26 markus 199: void
1.22 markus 200: add_local_forward(Options *options, u_short port, const char *host,
201: u_short host_port)
1.1 deraadt 202: {
1.17 markus 203: Forward *fwd;
204: extern uid_t original_real_uid;
205: if (port < IPPORT_RESERVED && original_real_uid != 0)
1.64 millert 206: fatal("Privileged ports can only be forwarded by root.");
1.17 markus 207: if (options->num_local_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
208: fatal("Too many local forwards (max %d).", SSH_MAX_FORWARDS_PER_DIRECTION);
209: fwd = &options->local_forwards[options->num_local_forwards++];
210: fwd->port = port;
211: fwd->host = xstrdup(host);
212: fwd->host_port = host_port;
1.1 deraadt 213: }
214:
1.19 markus 215: /*
216: * Adds a remote TCP/IP port forward to options. Never returns if there is
217: * an error.
218: */
1.1 deraadt 219:
1.26 markus 220: void
1.22 markus 221: add_remote_forward(Options *options, u_short port, const char *host,
222: u_short host_port)
1.1 deraadt 223: {
1.17 markus 224: Forward *fwd;
225: if (options->num_remote_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
226: fatal("Too many remote forwards (max %d).",
1.93 deraadt 227: SSH_MAX_FORWARDS_PER_DIRECTION);
1.17 markus 228: fwd = &options->remote_forwards[options->num_remote_forwards++];
229: fwd->port = port;
230: fwd->host = xstrdup(host);
231: fwd->host_port = host_port;
1.1 deraadt 232: }
233:
1.90 stevesk 234: static void
235: clear_forwardings(Options *options)
236: {
237: int i;
238:
239: for (i = 0; i < options->num_local_forwards; i++)
240: xfree(options->local_forwards[i].host);
241: options->num_local_forwards = 0;
242: for (i = 0; i < options->num_remote_forwards; i++)
243: xfree(options->remote_forwards[i].host);
244: options->num_remote_forwards = 0;
245: }
246:
1.19 markus 247: /*
1.70 stevesk 248: * Returns the number of the token pointed to by cp or oBadOption.
1.19 markus 249: */
1.1 deraadt 250:
1.26 markus 251: static OpCodes
1.17 markus 252: parse_token(const char *cp, const char *filename, int linenum)
1.1 deraadt 253: {
1.51 markus 254: u_int i;
1.1 deraadt 255:
1.17 markus 256: for (i = 0; keywords[i].name; i++)
1.20 markus 257: if (strcasecmp(cp, keywords[i].name) == 0)
1.17 markus 258: return keywords[i].opcode;
259:
1.75 stevesk 260: error("%s: line %d: Bad configuration option: %s",
261: filename, linenum, cp);
1.17 markus 262: return oBadOption;
1.1 deraadt 263: }
264:
1.19 markus 265: /*
266: * Processes a single option line as used in the configuration files. This
267: * only sets those values that have not already been set.
268: */
1.102 markus 269: #define WHITESPACE " \t\r\n"
1.1 deraadt 270:
1.14 markus 271: int
272: process_config_line(Options *options, const char *host,
1.17 markus 273: char *line, const char *filename, int linenum,
274: int *activep)
1.1 deraadt 275: {
1.102 markus 276: char buf[256], *s, **charptr, *endofnumber, *keyword, *arg;
1.22 markus 277: int opcode, *intptr, value;
1.102 markus 278: size_t len;
1.22 markus 279: u_short fwd_port, fwd_host_port;
1.88 stevesk 280: char sfwd_host_port[6];
1.106 djm 281:
282: /* Strip trailing whitespace */
283: for(len = strlen(line) - 1; len > 0; len--) {
284: if (strchr(WHITESPACE, line[len]) == NULL)
285: break;
286: line[len] = '\0';
287: }
1.1 deraadt 288:
1.42 provos 289: s = line;
290: /* Get the keyword. (Each line is supposed to begin with a keyword). */
291: keyword = strdelim(&s);
292: /* Ignore leading whitespace. */
293: if (*keyword == '\0')
1.43 markus 294: keyword = strdelim(&s);
1.56 deraadt 295: if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#')
1.17 markus 296: return 0;
297:
1.38 provos 298: opcode = parse_token(keyword, filename, linenum);
1.17 markus 299:
300: switch (opcode) {
301: case oBadOption:
1.19 markus 302: /* don't panic, but count bad options */
303: return -1;
1.17 markus 304: /* NOTREACHED */
1.111 djm 305: case oConnectTimeout:
306: intptr = &options->connection_timeout;
307: /* parse_time: */
308: arg = strdelim(&s);
309: if (!arg || *arg == '\0')
310: fatal("%s line %d: missing time value.",
311: filename, linenum);
312: if ((value = convtime(arg)) == -1)
313: fatal("%s line %d: invalid time value.",
314: filename, linenum);
315: if (*intptr == -1)
316: *intptr = value;
317: break;
318:
1.17 markus 319: case oForwardAgent:
320: intptr = &options->forward_agent;
321: parse_flag:
1.42 provos 322: arg = strdelim(&s);
1.40 ho 323: if (!arg || *arg == '\0')
1.17 markus 324: fatal("%.200s line %d: Missing yes/no argument.", filename, linenum);
325: value = 0; /* To avoid compiler warning... */
1.38 provos 326: if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
1.17 markus 327: value = 1;
1.38 provos 328: else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
1.17 markus 329: value = 0;
330: else
331: fatal("%.200s line %d: Bad yes/no argument.", filename, linenum);
332: if (*activep && *intptr == -1)
333: *intptr = value;
334: break;
335:
336: case oForwardX11:
337: intptr = &options->forward_x11;
338: goto parse_flag;
339:
1.123 markus 340: case oForwardX11Trusted:
341: intptr = &options->forward_x11_trusted;
342: goto parse_flag;
343:
1.17 markus 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:
1.118 markus 384: case oGssAuthentication:
385: intptr = &options->gss_authentication;
386: goto parse_flag;
387:
388: case oGssDelegateCreds:
389: intptr = &options->gss_deleg_creds;
390: goto parse_flag;
391:
1.17 markus 392: case oBatchMode:
393: intptr = &options->batch_mode;
394: goto parse_flag;
395:
396: case oCheckHostIP:
397: intptr = &options->check_host_ip;
398: goto parse_flag;
399:
1.107 jakob 400: case oVerifyHostKeyDNS:
401: intptr = &options->verify_host_key_dns;
1.125 ! jakob 402: goto parse_yesnoask;
1.107 jakob 403:
1.17 markus 404: case oStrictHostKeyChecking:
405: intptr = &options->strict_host_key_checking;
1.125 ! jakob 406: parse_yesnoask:
1.42 provos 407: arg = strdelim(&s);
1.40 ho 408: if (!arg || *arg == '\0')
1.60 stevesk 409: fatal("%.200s line %d: Missing yes/no/ask argument.",
1.93 deraadt 410: filename, linenum);
1.17 markus 411: value = 0; /* To avoid compiler warning... */
1.38 provos 412: if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
1.17 markus 413: value = 1;
1.38 provos 414: else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
1.17 markus 415: value = 0;
1.38 provos 416: else if (strcmp(arg, "ask") == 0)
1.17 markus 417: value = 2;
418: else
419: fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum);
420: if (*activep && *intptr == -1)
421: *intptr = value;
422: break;
423:
424: case oCompression:
425: intptr = &options->compression;
426: goto parse_flag;
427:
428: case oKeepAlives:
429: intptr = &options->keepalives;
430: goto parse_flag;
431:
1.91 markus 432: case oNoHostAuthenticationForLocalhost:
433: intptr = &options->no_host_authentication_for_localhost;
434: goto parse_flag;
435:
1.17 markus 436: case oNumberOfPasswordPrompts:
437: intptr = &options->number_of_password_prompts;
438: goto parse_int;
439:
440: case oCompressionLevel:
441: intptr = &options->compression_level;
442: goto parse_int;
443:
1.105 markus 444: case oRekeyLimit:
445: intptr = &options->rekey_limit;
446: arg = strdelim(&s);
447: if (!arg || *arg == '\0')
448: fatal("%.200s line %d: Missing argument.", filename, linenum);
449: if (arg[0] < '0' || arg[0] > '9')
450: fatal("%.200s line %d: Bad number.", filename, linenum);
451: value = strtol(arg, &endofnumber, 10);
452: if (arg == endofnumber)
453: fatal("%.200s line %d: Bad number.", filename, linenum);
454: switch (toupper(*endofnumber)) {
455: case 'K':
456: value *= 1<<10;
457: break;
458: case 'M':
459: value *= 1<<20;
460: break;
461: case 'G':
462: value *= 1<<30;
463: break;
464: }
465: if (*activep && *intptr == -1)
466: *intptr = value;
467: break;
468:
1.17 markus 469: case oIdentityFile:
1.42 provos 470: arg = strdelim(&s);
1.40 ho 471: if (!arg || *arg == '\0')
1.17 markus 472: fatal("%.200s line %d: Missing argument.", filename, linenum);
473: if (*activep) {
1.50 markus 474: intptr = &options->num_identity_files;
1.27 markus 475: if (*intptr >= SSH_MAX_IDENTITY_FILES)
1.17 markus 476: fatal("%.200s line %d: Too many identity files specified (max %d).",
1.93 deraadt 477: filename, linenum, SSH_MAX_IDENTITY_FILES);
1.50 markus 478: charptr = &options->identity_files[*intptr];
1.38 provos 479: *charptr = xstrdup(arg);
1.27 markus 480: *intptr = *intptr + 1;
1.17 markus 481: }
482: break;
483:
1.34 markus 484: case oXAuthLocation:
485: charptr=&options->xauth_location;
486: goto parse_string;
487:
1.17 markus 488: case oUser:
489: charptr = &options->user;
490: parse_string:
1.42 provos 491: arg = strdelim(&s);
1.40 ho 492: if (!arg || *arg == '\0')
1.17 markus 493: fatal("%.200s line %d: Missing argument.", filename, linenum);
494: if (*activep && *charptr == NULL)
1.38 provos 495: *charptr = xstrdup(arg);
1.17 markus 496: break;
497:
498: case oGlobalKnownHostsFile:
499: charptr = &options->system_hostfile;
500: goto parse_string;
501:
502: case oUserKnownHostsFile:
503: charptr = &options->user_hostfile;
504: goto parse_string;
505:
1.27 markus 506: case oGlobalKnownHostsFile2:
507: charptr = &options->system_hostfile2;
508: goto parse_string;
509:
510: case oUserKnownHostsFile2:
511: charptr = &options->user_hostfile2;
512: goto parse_string;
513:
1.17 markus 514: case oHostName:
515: charptr = &options->hostname;
516: goto parse_string;
517:
1.52 markus 518: case oHostKeyAlias:
519: charptr = &options->host_key_alias;
520: goto parse_string;
521:
1.67 markus 522: case oPreferredAuthentications:
523: charptr = &options->preferred_authentications;
524: goto parse_string;
525:
1.77 markus 526: case oBindAddress:
527: charptr = &options->bind_address;
528: goto parse_string;
529:
1.85 jakob 530: case oSmartcardDevice:
1.86 markus 531: charptr = &options->smartcard_device;
532: goto parse_string;
1.85 jakob 533:
1.17 markus 534: case oProxyCommand:
1.113 markus 535: if (s == NULL)
536: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.17 markus 537: charptr = &options->proxy_command;
1.102 markus 538: len = strspn(s, WHITESPACE "=");
1.17 markus 539: if (*activep && *charptr == NULL)
1.102 markus 540: *charptr = xstrdup(s + len);
1.17 markus 541: return 0;
542:
543: case oPort:
544: intptr = &options->port;
545: parse_int:
1.42 provos 546: arg = strdelim(&s);
1.40 ho 547: if (!arg || *arg == '\0')
1.17 markus 548: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 549: if (arg[0] < '0' || arg[0] > '9')
1.17 markus 550: fatal("%.200s line %d: Bad number.", filename, linenum);
1.21 markus 551:
552: /* Octal, decimal, or hex format? */
1.38 provos 553: value = strtol(arg, &endofnumber, 0);
554: if (arg == endofnumber)
1.21 markus 555: fatal("%.200s line %d: Bad number.", filename, linenum);
1.17 markus 556: if (*activep && *intptr == -1)
557: *intptr = value;
558: break;
559:
560: case oConnectionAttempts:
561: intptr = &options->connection_attempts;
562: goto parse_int;
563:
564: case oCipher:
565: intptr = &options->cipher;
1.42 provos 566: arg = strdelim(&s);
1.40 ho 567: if (!arg || *arg == '\0')
1.32 markus 568: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 569: value = cipher_number(arg);
1.17 markus 570: if (value == -1)
571: fatal("%.200s line %d: Bad cipher '%s'.",
1.93 deraadt 572: filename, linenum, arg ? arg : "<NONE>");
1.17 markus 573: if (*activep && *intptr == -1)
574: *intptr = value;
575: break;
576:
1.25 markus 577: case oCiphers:
1.42 provos 578: arg = strdelim(&s);
1.40 ho 579: if (!arg || *arg == '\0')
1.32 markus 580: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 581: if (!ciphers_valid(arg))
1.31 markus 582: fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.",
1.93 deraadt 583: filename, linenum, arg ? arg : "<NONE>");
1.25 markus 584: if (*activep && options->ciphers == NULL)
1.38 provos 585: options->ciphers = xstrdup(arg);
1.25 markus 586: break;
587:
1.62 markus 588: case oMacs:
589: arg = strdelim(&s);
590: if (!arg || *arg == '\0')
591: fatal("%.200s line %d: Missing argument.", filename, linenum);
592: if (!mac_valid(arg))
593: fatal("%.200s line %d: Bad SSH2 Mac spec '%s'.",
1.93 deraadt 594: filename, linenum, arg ? arg : "<NONE>");
1.62 markus 595: if (*activep && options->macs == NULL)
596: options->macs = xstrdup(arg);
597: break;
598:
1.76 markus 599: case oHostKeyAlgorithms:
600: arg = strdelim(&s);
601: if (!arg || *arg == '\0')
602: fatal("%.200s line %d: Missing argument.", filename, linenum);
603: if (!key_names_valid2(arg))
604: fatal("%.200s line %d: Bad protocol 2 host key algorithms '%s'.",
1.93 deraadt 605: filename, linenum, arg ? arg : "<NONE>");
1.76 markus 606: if (*activep && options->hostkeyalgorithms == NULL)
607: options->hostkeyalgorithms = xstrdup(arg);
608: break;
609:
1.25 markus 610: case oProtocol:
611: intptr = &options->protocol;
1.42 provos 612: arg = strdelim(&s);
1.40 ho 613: if (!arg || *arg == '\0')
1.32 markus 614: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 615: value = proto_spec(arg);
1.25 markus 616: if (value == SSH_PROTO_UNKNOWN)
617: fatal("%.200s line %d: Bad protocol spec '%s'.",
1.93 deraadt 618: filename, linenum, arg ? arg : "<NONE>");
1.25 markus 619: if (*activep && *intptr == SSH_PROTO_UNKNOWN)
620: *intptr = value;
621: break;
622:
1.17 markus 623: case oLogLevel:
624: intptr = (int *) &options->log_level;
1.42 provos 625: arg = strdelim(&s);
1.38 provos 626: value = log_level_number(arg);
1.95 markus 627: if (value == SYSLOG_LEVEL_NOT_SET)
1.64 millert 628: fatal("%.200s line %d: unsupported log level '%s'",
1.93 deraadt 629: filename, linenum, arg ? arg : "<NONE>");
1.95 markus 630: if (*activep && (LogLevel) *intptr == SYSLOG_LEVEL_NOT_SET)
1.17 markus 631: *intptr = (LogLevel) value;
632: break;
633:
1.88 stevesk 634: case oLocalForward:
1.17 markus 635: case oRemoteForward:
1.42 provos 636: arg = strdelim(&s);
1.40 ho 637: if (!arg || *arg == '\0')
1.88 stevesk 638: fatal("%.200s line %d: Missing port argument.",
639: filename, linenum);
640: if ((fwd_port = a2port(arg)) == 0)
641: fatal("%.200s line %d: Bad listen port.",
642: filename, linenum);
1.42 provos 643: arg = strdelim(&s);
1.40 ho 644: if (!arg || *arg == '\0')
1.17 markus 645: fatal("%.200s line %d: Missing second argument.",
1.88 stevesk 646: filename, linenum);
647: if (sscanf(arg, "%255[^:]:%5[0-9]", buf, sfwd_host_port) != 2 &&
648: sscanf(arg, "%255[^/]/%5[0-9]", buf, sfwd_host_port) != 2)
649: fatal("%.200s line %d: Bad forwarding specification.",
650: filename, linenum);
651: if ((fwd_host_port = a2port(sfwd_host_port)) == 0)
652: fatal("%.200s line %d: Bad forwarding port.",
653: filename, linenum);
654: if (*activep) {
655: if (opcode == oLocalForward)
656: add_local_forward(options, fwd_port, buf,
657: fwd_host_port);
658: else if (opcode == oRemoteForward)
659: add_remote_forward(options, fwd_port, buf,
660: fwd_host_port);
661: }
1.17 markus 662: break;
1.71 markus 663:
664: case oDynamicForward:
665: arg = strdelim(&s);
666: if (!arg || *arg == '\0')
667: fatal("%.200s line %d: Missing port argument.",
668: filename, linenum);
1.74 stevesk 669: fwd_port = a2port(arg);
670: if (fwd_port == 0)
1.71 markus 671: fatal("%.200s line %d: Badly formatted port number.",
672: filename, linenum);
1.87 markus 673: if (*activep)
1.117 markus 674: add_local_forward(options, fwd_port, "socks", 0);
1.72 markus 675: break;
1.17 markus 676:
1.90 stevesk 677: case oClearAllForwardings:
678: intptr = &options->clear_forwardings;
679: goto parse_flag;
680:
1.17 markus 681: case oHost:
682: *activep = 0;
1.42 provos 683: while ((arg = strdelim(&s)) != NULL && *arg != '\0')
1.38 provos 684: if (match_pattern(host, arg)) {
685: debug("Applying options for %.100s", arg);
1.17 markus 686: *activep = 1;
687: break;
688: }
1.42 provos 689: /* Avoid garbage check below, as strdelim is done. */
1.17 markus 690: return 0;
691:
692: case oEscapeChar:
693: intptr = &options->escape_char;
1.42 provos 694: arg = strdelim(&s);
1.40 ho 695: if (!arg || *arg == '\0')
1.17 markus 696: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 697: if (arg[0] == '^' && arg[2] == 0 &&
1.51 markus 698: (u_char) arg[1] >= 64 && (u_char) arg[1] < 128)
699: value = (u_char) arg[1] & 31;
1.38 provos 700: else if (strlen(arg) == 1)
1.51 markus 701: value = (u_char) arg[0];
1.38 provos 702: else if (strcmp(arg, "none") == 0)
1.79 stevesk 703: value = SSH_ESCAPECHAR_NONE;
1.17 markus 704: else {
705: fatal("%.200s line %d: Bad escape character.",
1.93 deraadt 706: filename, linenum);
1.17 markus 707: /* NOTREACHED */
708: value = 0; /* Avoid compiler warning. */
709: }
710: if (*activep && *intptr == -1)
711: *intptr = value;
1.112 djm 712: break;
713:
714: case oAddressFamily:
715: arg = strdelim(&s);
1.114 djm 716: intptr = &options->address_family;
1.112 djm 717: if (strcasecmp(arg, "inet") == 0)
1.114 djm 718: value = AF_INET;
1.112 djm 719: else if (strcasecmp(arg, "inet6") == 0)
1.114 djm 720: value = AF_INET6;
1.112 djm 721: else if (strcasecmp(arg, "any") == 0)
1.114 djm 722: value = AF_UNSPEC;
1.112 djm 723: else
724: fatal("Unsupported AddressFamily \"%s\"", arg);
1.114 djm 725: if (*activep && *intptr == -1)
726: *intptr = value;
1.17 markus 727: break;
728:
1.101 markus 729: case oEnableSSHKeysign:
730: intptr = &options->enable_ssh_keysign;
731: goto parse_flag;
732:
1.96 markus 733: case oDeprecated:
1.98 markus 734: debug("%s line %d: Deprecated option \"%s\"",
1.96 markus 735: filename, linenum, keyword);
1.98 markus 736: return 0;
1.96 markus 737:
1.110 jakob 738: case oUnsupported:
739: error("%s line %d: Unsupported option \"%s\"",
740: filename, linenum, keyword);
741: return 0;
742:
1.17 markus 743: default:
744: fatal("process_config_line: Unimplemented opcode %d", opcode);
745: }
746:
747: /* Check that there is no garbage at end of line. */
1.57 djm 748: if ((arg = strdelim(&s)) != NULL && *arg != '\0') {
1.39 ho 749: fatal("%.200s line %d: garbage at end of line; \"%.200s\".",
1.93 deraadt 750: filename, linenum, arg);
1.39 ho 751: }
1.17 markus 752: return 0;
1.1 deraadt 753: }
754:
755:
1.19 markus 756: /*
757: * Reads the config file and modifies the options accordingly. Options
758: * should already be initialized before this call. This never returns if
1.89 stevesk 759: * there is an error. If the file does not exist, this returns 0.
1.19 markus 760: */
1.1 deraadt 761:
1.89 stevesk 762: int
1.17 markus 763: read_config_file(const char *filename, const char *host, Options *options)
1.1 deraadt 764: {
1.17 markus 765: FILE *f;
766: char line[1024];
767: int active, linenum;
768: int bad_options = 0;
769:
770: /* Open the file. */
771: f = fopen(filename, "r");
772: if (!f)
1.89 stevesk 773: return 0;
1.17 markus 774:
775: debug("Reading configuration data %.200s", filename);
776:
1.19 markus 777: /*
778: * Mark that we are now processing the options. This flag is turned
779: * on/off by Host specifications.
780: */
1.17 markus 781: active = 1;
782: linenum = 0;
783: while (fgets(line, sizeof(line), f)) {
784: /* Update line number counter. */
785: linenum++;
786: if (process_config_line(options, host, line, filename, linenum, &active) != 0)
787: bad_options++;
788: }
789: fclose(f);
790: if (bad_options > 0)
1.64 millert 791: fatal("%s: terminating, %d bad configuration options",
1.93 deraadt 792: filename, bad_options);
1.89 stevesk 793: return 1;
1.1 deraadt 794: }
795:
1.19 markus 796: /*
797: * Initializes options to special values that indicate that they have not yet
798: * been set. Read_config_file will only set options with this value. Options
799: * are processed in the following order: command line, user config file,
800: * system config file. Last, fill_default_options is called.
801: */
1.1 deraadt 802:
1.26 markus 803: void
1.17 markus 804: initialize_options(Options * options)
1.1 deraadt 805: {
1.17 markus 806: memset(options, 'X', sizeof(*options));
807: options->forward_agent = -1;
808: options->forward_x11 = -1;
1.123 markus 809: options->forward_x11_trusted = -1;
1.34 markus 810: options->xauth_location = NULL;
1.17 markus 811: options->gateway_ports = -1;
812: options->use_privileged_port = -1;
813: options->rsa_authentication = -1;
1.50 markus 814: options->pubkey_authentication = -1;
1.78 markus 815: options->challenge_response_authentication = -1;
1.118 markus 816: options->gss_authentication = -1;
817: options->gss_deleg_creds = -1;
1.17 markus 818: options->password_authentication = -1;
1.48 markus 819: options->kbd_interactive_authentication = -1;
820: options->kbd_interactive_devices = NULL;
1.17 markus 821: options->rhosts_rsa_authentication = -1;
1.72 markus 822: options->hostbased_authentication = -1;
1.17 markus 823: options->batch_mode = -1;
824: options->check_host_ip = -1;
825: options->strict_host_key_checking = -1;
826: options->compression = -1;
827: options->keepalives = -1;
828: options->compression_level = -1;
829: options->port = -1;
1.114 djm 830: options->address_family = -1;
1.17 markus 831: options->connection_attempts = -1;
1.111 djm 832: options->connection_timeout = -1;
1.17 markus 833: options->number_of_password_prompts = -1;
834: options->cipher = -1;
1.25 markus 835: options->ciphers = NULL;
1.62 markus 836: options->macs = NULL;
1.76 markus 837: options->hostkeyalgorithms = NULL;
1.25 markus 838: options->protocol = SSH_PROTO_UNKNOWN;
1.17 markus 839: options->num_identity_files = 0;
840: options->hostname = NULL;
1.52 markus 841: options->host_key_alias = NULL;
1.17 markus 842: options->proxy_command = NULL;
843: options->user = NULL;
844: options->escape_char = -1;
845: options->system_hostfile = NULL;
846: options->user_hostfile = NULL;
1.27 markus 847: options->system_hostfile2 = NULL;
848: options->user_hostfile2 = NULL;
1.17 markus 849: options->num_local_forwards = 0;
850: options->num_remote_forwards = 0;
1.90 stevesk 851: options->clear_forwardings = -1;
1.95 markus 852: options->log_level = SYSLOG_LEVEL_NOT_SET;
1.67 markus 853: options->preferred_authentications = NULL;
1.77 markus 854: options->bind_address = NULL;
1.86 markus 855: options->smartcard_device = NULL;
1.101 markus 856: options->enable_ssh_keysign = - 1;
1.91 markus 857: options->no_host_authentication_for_localhost = - 1;
1.105 markus 858: options->rekey_limit = - 1;
1.107 jakob 859: options->verify_host_key_dns = -1;
1.1 deraadt 860: }
861:
1.19 markus 862: /*
863: * Called after processing other sources of option data, this fills those
864: * options for which no value has been specified with their default values.
865: */
1.1 deraadt 866:
1.26 markus 867: void
1.17 markus 868: fill_default_options(Options * options)
1.1 deraadt 869: {
1.61 deraadt 870: int len;
871:
1.17 markus 872: if (options->forward_agent == -1)
1.33 markus 873: options->forward_agent = 0;
1.17 markus 874: if (options->forward_x11 == -1)
1.23 markus 875: options->forward_x11 = 0;
1.123 markus 876: if (options->forward_x11_trusted == -1)
877: options->forward_x11_trusted = 0;
1.34 markus 878: if (options->xauth_location == NULL)
1.80 markus 879: options->xauth_location = _PATH_XAUTH;
1.17 markus 880: if (options->gateway_ports == -1)
881: options->gateway_ports = 0;
882: if (options->use_privileged_port == -1)
1.65 markus 883: options->use_privileged_port = 0;
1.17 markus 884: if (options->rsa_authentication == -1)
885: options->rsa_authentication = 1;
1.50 markus 886: if (options->pubkey_authentication == -1)
887: options->pubkey_authentication = 1;
1.78 markus 888: if (options->challenge_response_authentication == -1)
1.83 markus 889: options->challenge_response_authentication = 1;
1.118 markus 890: if (options->gss_authentication == -1)
1.122 markus 891: options->gss_authentication = 0;
1.118 markus 892: if (options->gss_deleg_creds == -1)
893: options->gss_deleg_creds = 0;
1.17 markus 894: if (options->password_authentication == -1)
895: options->password_authentication = 1;
1.48 markus 896: if (options->kbd_interactive_authentication == -1)
1.59 markus 897: options->kbd_interactive_authentication = 1;
1.17 markus 898: if (options->rhosts_rsa_authentication == -1)
1.99 stevesk 899: options->rhosts_rsa_authentication = 0;
1.72 markus 900: if (options->hostbased_authentication == -1)
901: options->hostbased_authentication = 0;
1.17 markus 902: if (options->batch_mode == -1)
903: options->batch_mode = 0;
904: if (options->check_host_ip == -1)
905: options->check_host_ip = 1;
906: if (options->strict_host_key_checking == -1)
907: options->strict_host_key_checking = 2; /* 2 is default */
908: if (options->compression == -1)
909: options->compression = 0;
910: if (options->keepalives == -1)
911: options->keepalives = 1;
912: if (options->compression_level == -1)
913: options->compression_level = 6;
914: if (options->port == -1)
915: options->port = 0; /* Filled in ssh_connect. */
1.114 djm 916: if (options->address_family == -1)
917: options->address_family = AF_UNSPEC;
1.17 markus 918: if (options->connection_attempts == -1)
1.84 markus 919: options->connection_attempts = 1;
1.17 markus 920: if (options->number_of_password_prompts == -1)
921: options->number_of_password_prompts = 3;
922: /* Selected in ssh_login(). */
923: if (options->cipher == -1)
924: options->cipher = SSH_CIPHER_NOT_SET;
1.31 markus 925: /* options->ciphers, default set in myproposals.h */
1.62 markus 926: /* options->macs, default set in myproposals.h */
1.76 markus 927: /* options->hostkeyalgorithms, default set in myproposals.h */
1.25 markus 928: if (options->protocol == SSH_PROTO_UNKNOWN)
1.69 markus 929: options->protocol = SSH_PROTO_1|SSH_PROTO_2;
1.17 markus 930: if (options->num_identity_files == 0) {
1.50 markus 931: if (options->protocol & SSH_PROTO_1) {
1.61 deraadt 932: len = 2 + strlen(_PATH_SSH_CLIENT_IDENTITY) + 1;
1.50 markus 933: options->identity_files[options->num_identity_files] =
1.61 deraadt 934: xmalloc(len);
935: snprintf(options->identity_files[options->num_identity_files++],
936: len, "~/%.100s", _PATH_SSH_CLIENT_IDENTITY);
1.50 markus 937: }
938: if (options->protocol & SSH_PROTO_2) {
1.63 deraadt 939: len = 2 + strlen(_PATH_SSH_CLIENT_ID_RSA) + 1;
940: options->identity_files[options->num_identity_files] =
941: xmalloc(len);
942: snprintf(options->identity_files[options->num_identity_files++],
943: len, "~/%.100s", _PATH_SSH_CLIENT_ID_RSA);
944:
1.61 deraadt 945: len = 2 + strlen(_PATH_SSH_CLIENT_ID_DSA) + 1;
1.50 markus 946: options->identity_files[options->num_identity_files] =
1.61 deraadt 947: xmalloc(len);
948: snprintf(options->identity_files[options->num_identity_files++],
949: len, "~/%.100s", _PATH_SSH_CLIENT_ID_DSA);
1.50 markus 950: }
1.27 markus 951: }
1.17 markus 952: if (options->escape_char == -1)
953: options->escape_char = '~';
954: if (options->system_hostfile == NULL)
1.55 markus 955: options->system_hostfile = _PATH_SSH_SYSTEM_HOSTFILE;
1.17 markus 956: if (options->user_hostfile == NULL)
1.55 markus 957: options->user_hostfile = _PATH_SSH_USER_HOSTFILE;
1.27 markus 958: if (options->system_hostfile2 == NULL)
1.55 markus 959: options->system_hostfile2 = _PATH_SSH_SYSTEM_HOSTFILE2;
1.27 markus 960: if (options->user_hostfile2 == NULL)
1.55 markus 961: options->user_hostfile2 = _PATH_SSH_USER_HOSTFILE2;
1.95 markus 962: if (options->log_level == SYSLOG_LEVEL_NOT_SET)
1.54 markus 963: options->log_level = SYSLOG_LEVEL_INFO;
1.90 stevesk 964: if (options->clear_forwardings == 1)
965: clear_forwardings(options);
1.91 markus 966: if (options->no_host_authentication_for_localhost == - 1)
967: options->no_host_authentication_for_localhost = 0;
1.101 markus 968: if (options->enable_ssh_keysign == -1)
969: options->enable_ssh_keysign = 0;
1.105 markus 970: if (options->rekey_limit == -1)
971: options->rekey_limit = 0;
1.107 jakob 972: if (options->verify_host_key_dns == -1)
973: options->verify_host_key_dns = 0;
1.17 markus 974: /* options->proxy_command should not be set by default */
975: /* options->user will be set in the main program if appropriate */
976: /* options->hostname will be set in the main program if appropriate */
1.52 markus 977: /* options->host_key_alias should not be set by default */
1.67 markus 978: /* options->preferred_authentications will be set in ssh */
1.1 deraadt 979: }
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