Annotation of src/usr.bin/ssh/readconf.c, Revision 1.127
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"
1.127 ! markus 15: RCSID("$OpenBSD: readconf.c,v 1.126 2003/12/09 21:53:36 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,
1.127 ! markus 108: oServerAliveInterval, oServerAliveCountMax,
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 */
1.17 markus 150: { "hostname", oHostName },
1.52 markus 151: { "hostkeyalias", oHostKeyAlias },
1.17 markus 152: { "proxycommand", oProxyCommand },
153: { "port", oPort },
154: { "cipher", oCipher },
1.25 markus 155: { "ciphers", oCiphers },
1.62 markus 156: { "macs", oMacs },
1.25 markus 157: { "protocol", oProtocol },
1.17 markus 158: { "remoteforward", oRemoteForward },
159: { "localforward", oLocalForward },
160: { "user", oUser },
161: { "host", oHost },
162: { "escapechar", oEscapeChar },
163: { "globalknownhostsfile", oGlobalKnownHostsFile },
1.81 markus 164: { "userknownhostsfile", oUserKnownHostsFile }, /* obsolete */
1.27 markus 165: { "globalknownhostsfile2", oGlobalKnownHostsFile2 },
1.81 markus 166: { "userknownhostsfile2", oUserKnownHostsFile2 }, /* obsolete */
1.17 markus 167: { "connectionattempts", oConnectionAttempts },
168: { "batchmode", oBatchMode },
169: { "checkhostip", oCheckHostIP },
170: { "stricthostkeychecking", oStrictHostKeyChecking },
171: { "compression", oCompression },
172: { "compressionlevel", oCompressionLevel },
1.126 markus 173: { "tcpkeepalive", oTCPKeepAlive },
174: { "keepalive", oTCPKeepAlive }, /* obsolete */
1.17 markus 175: { "numberofpasswordprompts", oNumberOfPasswordPrompts },
176: { "loglevel", oLogLevel },
1.71 markus 177: { "dynamicforward", oDynamicForward },
1.67 markus 178: { "preferredauthentications", oPreferredAuthentications },
1.76 markus 179: { "hostkeyalgorithms", oHostKeyAlgorithms },
1.77 markus 180: { "bindaddress", oBindAddress },
1.110 jakob 181: #ifdef SMARTCARD
1.85 jakob 182: { "smartcarddevice", oSmartcardDevice },
1.110 jakob 183: #else
184: { "smartcarddevice", oUnsupported },
185: #endif
1.93 deraadt 186: { "clearallforwardings", oClearAllForwardings },
1.101 markus 187: { "enablesshkeysign", oEnableSSHKeysign },
1.107 jakob 188: { "verifyhostkeydns", oVerifyHostKeyDNS },
1.93 deraadt 189: { "nohostauthenticationforlocalhost", oNoHostAuthenticationForLocalhost },
1.105 markus 190: { "rekeylimit", oRekeyLimit },
1.111 djm 191: { "connecttimeout", oConnectTimeout },
1.112 djm 192: { "addressfamily", oAddressFamily },
1.127 ! markus 193: { "serveraliveinterval", oServerAliveInterval },
! 194: { "serveralivecountmax", oServerAliveCountMax },
1.92 stevesk 195: { NULL, oBadOption }
1.13 markus 196: };
197:
1.19 markus 198: /*
199: * Adds a local TCP/IP port forward to options. Never returns if there is an
200: * error.
201: */
1.1 deraadt 202:
1.26 markus 203: void
1.22 markus 204: add_local_forward(Options *options, u_short port, const char *host,
205: u_short host_port)
1.1 deraadt 206: {
1.17 markus 207: Forward *fwd;
208: extern uid_t original_real_uid;
209: if (port < IPPORT_RESERVED && original_real_uid != 0)
1.64 millert 210: fatal("Privileged ports can only be forwarded by root.");
1.17 markus 211: if (options->num_local_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
212: fatal("Too many local forwards (max %d).", SSH_MAX_FORWARDS_PER_DIRECTION);
213: fwd = &options->local_forwards[options->num_local_forwards++];
214: fwd->port = port;
215: fwd->host = xstrdup(host);
216: fwd->host_port = host_port;
1.1 deraadt 217: }
218:
1.19 markus 219: /*
220: * Adds a remote TCP/IP port forward to options. Never returns if there is
221: * an error.
222: */
1.1 deraadt 223:
1.26 markus 224: void
1.22 markus 225: add_remote_forward(Options *options, u_short port, const char *host,
226: u_short host_port)
1.1 deraadt 227: {
1.17 markus 228: Forward *fwd;
229: if (options->num_remote_forwards >= SSH_MAX_FORWARDS_PER_DIRECTION)
230: fatal("Too many remote forwards (max %d).",
1.93 deraadt 231: SSH_MAX_FORWARDS_PER_DIRECTION);
1.17 markus 232: fwd = &options->remote_forwards[options->num_remote_forwards++];
233: fwd->port = port;
234: fwd->host = xstrdup(host);
235: fwd->host_port = host_port;
1.1 deraadt 236: }
237:
1.90 stevesk 238: static void
239: clear_forwardings(Options *options)
240: {
241: int i;
242:
243: for (i = 0; i < options->num_local_forwards; i++)
244: xfree(options->local_forwards[i].host);
245: options->num_local_forwards = 0;
246: for (i = 0; i < options->num_remote_forwards; i++)
247: xfree(options->remote_forwards[i].host);
248: options->num_remote_forwards = 0;
249: }
250:
1.19 markus 251: /*
1.70 stevesk 252: * Returns the number of the token pointed to by cp or oBadOption.
1.19 markus 253: */
1.1 deraadt 254:
1.26 markus 255: static OpCodes
1.17 markus 256: parse_token(const char *cp, const char *filename, int linenum)
1.1 deraadt 257: {
1.51 markus 258: u_int i;
1.1 deraadt 259:
1.17 markus 260: for (i = 0; keywords[i].name; i++)
1.20 markus 261: if (strcasecmp(cp, keywords[i].name) == 0)
1.17 markus 262: return keywords[i].opcode;
263:
1.75 stevesk 264: error("%s: line %d: Bad configuration option: %s",
265: filename, linenum, cp);
1.17 markus 266: return oBadOption;
1.1 deraadt 267: }
268:
1.19 markus 269: /*
270: * Processes a single option line as used in the configuration files. This
271: * only sets those values that have not already been set.
272: */
1.102 markus 273: #define WHITESPACE " \t\r\n"
1.1 deraadt 274:
1.14 markus 275: int
276: process_config_line(Options *options, const char *host,
1.17 markus 277: char *line, const char *filename, int linenum,
278: int *activep)
1.1 deraadt 279: {
1.102 markus 280: char buf[256], *s, **charptr, *endofnumber, *keyword, *arg;
1.22 markus 281: int opcode, *intptr, value;
1.102 markus 282: size_t len;
1.22 markus 283: u_short fwd_port, fwd_host_port;
1.88 stevesk 284: char sfwd_host_port[6];
1.106 djm 285:
286: /* Strip trailing whitespace */
287: for(len = strlen(line) - 1; len > 0; len--) {
288: if (strchr(WHITESPACE, line[len]) == NULL)
289: break;
290: line[len] = '\0';
291: }
1.1 deraadt 292:
1.42 provos 293: s = line;
294: /* Get the keyword. (Each line is supposed to begin with a keyword). */
295: keyword = strdelim(&s);
296: /* Ignore leading whitespace. */
297: if (*keyword == '\0')
1.43 markus 298: keyword = strdelim(&s);
1.56 deraadt 299: if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#')
1.17 markus 300: return 0;
301:
1.38 provos 302: opcode = parse_token(keyword, filename, linenum);
1.17 markus 303:
304: switch (opcode) {
305: case oBadOption:
1.19 markus 306: /* don't panic, but count bad options */
307: return -1;
1.17 markus 308: /* NOTREACHED */
1.111 djm 309: case oConnectTimeout:
310: intptr = &options->connection_timeout;
1.127 ! markus 311: parse_time:
1.111 djm 312: arg = strdelim(&s);
313: if (!arg || *arg == '\0')
314: fatal("%s line %d: missing time value.",
315: filename, linenum);
316: if ((value = convtime(arg)) == -1)
317: fatal("%s line %d: invalid time value.",
318: filename, linenum);
319: if (*intptr == -1)
320: *intptr = value;
321: break;
322:
1.17 markus 323: case oForwardAgent:
324: intptr = &options->forward_agent;
325: parse_flag:
1.42 provos 326: arg = strdelim(&s);
1.40 ho 327: if (!arg || *arg == '\0')
1.17 markus 328: fatal("%.200s line %d: Missing yes/no argument.", filename, linenum);
329: value = 0; /* To avoid compiler warning... */
1.38 provos 330: if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
1.17 markus 331: value = 1;
1.38 provos 332: else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
1.17 markus 333: value = 0;
334: else
335: fatal("%.200s line %d: Bad yes/no argument.", filename, linenum);
336: if (*activep && *intptr == -1)
337: *intptr = value;
338: break;
339:
340: case oForwardX11:
341: intptr = &options->forward_x11;
342: goto parse_flag;
343:
1.123 markus 344: case oForwardX11Trusted:
345: intptr = &options->forward_x11_trusted;
346: goto parse_flag;
347:
1.17 markus 348: case oGatewayPorts:
349: intptr = &options->gateway_ports;
350: goto parse_flag;
351:
352: case oUsePrivilegedPort:
353: intptr = &options->use_privileged_port;
354: goto parse_flag;
355:
356: case oPasswordAuthentication:
357: intptr = &options->password_authentication;
358: goto parse_flag;
359:
1.48 markus 360: case oKbdInteractiveAuthentication:
361: intptr = &options->kbd_interactive_authentication;
362: goto parse_flag;
363:
364: case oKbdInteractiveDevices:
365: charptr = &options->kbd_interactive_devices;
366: goto parse_string;
367:
1.50 markus 368: case oPubkeyAuthentication:
369: intptr = &options->pubkey_authentication;
1.30 markus 370: goto parse_flag;
371:
1.17 markus 372: case oRSAAuthentication:
373: intptr = &options->rsa_authentication;
374: goto parse_flag;
375:
376: case oRhostsRSAAuthentication:
377: intptr = &options->rhosts_rsa_authentication;
378: goto parse_flag;
379:
1.72 markus 380: case oHostbasedAuthentication:
381: intptr = &options->hostbased_authentication;
382: goto parse_flag;
383:
1.59 markus 384: case oChallengeResponseAuthentication:
1.78 markus 385: intptr = &options->challenge_response_authentication;
1.17 markus 386: goto parse_flag;
1.108 jakob 387:
1.118 markus 388: case oGssAuthentication:
389: intptr = &options->gss_authentication;
390: goto parse_flag;
391:
392: case oGssDelegateCreds:
393: intptr = &options->gss_deleg_creds;
394: goto parse_flag;
395:
1.17 markus 396: case oBatchMode:
397: intptr = &options->batch_mode;
398: goto parse_flag;
399:
400: case oCheckHostIP:
401: intptr = &options->check_host_ip;
402: goto parse_flag;
403:
1.107 jakob 404: case oVerifyHostKeyDNS:
405: intptr = &options->verify_host_key_dns;
1.125 jakob 406: goto parse_yesnoask;
1.107 jakob 407:
1.17 markus 408: case oStrictHostKeyChecking:
409: intptr = &options->strict_host_key_checking;
1.125 jakob 410: parse_yesnoask:
1.42 provos 411: arg = strdelim(&s);
1.40 ho 412: if (!arg || *arg == '\0')
1.60 stevesk 413: fatal("%.200s line %d: Missing yes/no/ask argument.",
1.93 deraadt 414: filename, linenum);
1.17 markus 415: value = 0; /* To avoid compiler warning... */
1.38 provos 416: if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
1.17 markus 417: value = 1;
1.38 provos 418: else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
1.17 markus 419: value = 0;
1.38 provos 420: else if (strcmp(arg, "ask") == 0)
1.17 markus 421: value = 2;
422: else
423: fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum);
424: if (*activep && *intptr == -1)
425: *intptr = value;
426: break;
427:
428: case oCompression:
429: intptr = &options->compression;
430: goto parse_flag;
431:
1.126 markus 432: case oTCPKeepAlive:
433: intptr = &options->tcp_keep_alive;
1.17 markus 434: goto parse_flag;
435:
1.91 markus 436: case oNoHostAuthenticationForLocalhost:
437: intptr = &options->no_host_authentication_for_localhost;
438: goto parse_flag;
439:
1.17 markus 440: case oNumberOfPasswordPrompts:
441: intptr = &options->number_of_password_prompts;
442: goto parse_int;
443:
444: case oCompressionLevel:
445: intptr = &options->compression_level;
446: goto parse_int;
447:
1.105 markus 448: case oRekeyLimit:
449: intptr = &options->rekey_limit;
450: arg = strdelim(&s);
451: if (!arg || *arg == '\0')
452: fatal("%.200s line %d: Missing argument.", filename, linenum);
453: if (arg[0] < '0' || arg[0] > '9')
454: fatal("%.200s line %d: Bad number.", filename, linenum);
455: value = strtol(arg, &endofnumber, 10);
456: if (arg == endofnumber)
457: fatal("%.200s line %d: Bad number.", filename, linenum);
458: switch (toupper(*endofnumber)) {
459: case 'K':
460: value *= 1<<10;
461: break;
462: case 'M':
463: value *= 1<<20;
464: break;
465: case 'G':
466: value *= 1<<30;
467: break;
468: }
469: if (*activep && *intptr == -1)
470: *intptr = value;
471: break;
472:
1.17 markus 473: case oIdentityFile:
1.42 provos 474: arg = strdelim(&s);
1.40 ho 475: if (!arg || *arg == '\0')
1.17 markus 476: fatal("%.200s line %d: Missing argument.", filename, linenum);
477: if (*activep) {
1.50 markus 478: intptr = &options->num_identity_files;
1.27 markus 479: if (*intptr >= SSH_MAX_IDENTITY_FILES)
1.17 markus 480: fatal("%.200s line %d: Too many identity files specified (max %d).",
1.93 deraadt 481: filename, linenum, SSH_MAX_IDENTITY_FILES);
1.50 markus 482: charptr = &options->identity_files[*intptr];
1.38 provos 483: *charptr = xstrdup(arg);
1.27 markus 484: *intptr = *intptr + 1;
1.17 markus 485: }
486: break;
487:
1.34 markus 488: case oXAuthLocation:
489: charptr=&options->xauth_location;
490: goto parse_string;
491:
1.17 markus 492: case oUser:
493: charptr = &options->user;
494: parse_string:
1.42 provos 495: arg = strdelim(&s);
1.40 ho 496: if (!arg || *arg == '\0')
1.17 markus 497: fatal("%.200s line %d: Missing argument.", filename, linenum);
498: if (*activep && *charptr == NULL)
1.38 provos 499: *charptr = xstrdup(arg);
1.17 markus 500: break;
501:
502: case oGlobalKnownHostsFile:
503: charptr = &options->system_hostfile;
504: goto parse_string;
505:
506: case oUserKnownHostsFile:
507: charptr = &options->user_hostfile;
508: goto parse_string;
509:
1.27 markus 510: case oGlobalKnownHostsFile2:
511: charptr = &options->system_hostfile2;
512: goto parse_string;
513:
514: case oUserKnownHostsFile2:
515: charptr = &options->user_hostfile2;
516: goto parse_string;
517:
1.17 markus 518: case oHostName:
519: charptr = &options->hostname;
520: goto parse_string;
521:
1.52 markus 522: case oHostKeyAlias:
523: charptr = &options->host_key_alias;
524: goto parse_string;
525:
1.67 markus 526: case oPreferredAuthentications:
527: charptr = &options->preferred_authentications;
528: goto parse_string;
529:
1.77 markus 530: case oBindAddress:
531: charptr = &options->bind_address;
532: goto parse_string;
533:
1.85 jakob 534: case oSmartcardDevice:
1.86 markus 535: charptr = &options->smartcard_device;
536: goto parse_string;
1.85 jakob 537:
1.17 markus 538: case oProxyCommand:
1.113 markus 539: if (s == NULL)
540: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.17 markus 541: charptr = &options->proxy_command;
1.102 markus 542: len = strspn(s, WHITESPACE "=");
1.17 markus 543: if (*activep && *charptr == NULL)
1.102 markus 544: *charptr = xstrdup(s + len);
1.17 markus 545: return 0;
546:
547: case oPort:
548: intptr = &options->port;
549: parse_int:
1.42 provos 550: arg = strdelim(&s);
1.40 ho 551: if (!arg || *arg == '\0')
1.17 markus 552: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 553: if (arg[0] < '0' || arg[0] > '9')
1.17 markus 554: fatal("%.200s line %d: Bad number.", filename, linenum);
1.21 markus 555:
556: /* Octal, decimal, or hex format? */
1.38 provos 557: value = strtol(arg, &endofnumber, 0);
558: if (arg == endofnumber)
1.21 markus 559: fatal("%.200s line %d: Bad number.", filename, linenum);
1.17 markus 560: if (*activep && *intptr == -1)
561: *intptr = value;
562: break;
563:
564: case oConnectionAttempts:
565: intptr = &options->connection_attempts;
566: goto parse_int;
567:
568: case oCipher:
569: intptr = &options->cipher;
1.42 provos 570: arg = strdelim(&s);
1.40 ho 571: if (!arg || *arg == '\0')
1.32 markus 572: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 573: value = cipher_number(arg);
1.17 markus 574: if (value == -1)
575: fatal("%.200s line %d: Bad cipher '%s'.",
1.93 deraadt 576: filename, linenum, arg ? arg : "<NONE>");
1.17 markus 577: if (*activep && *intptr == -1)
578: *intptr = value;
579: break;
580:
1.25 markus 581: case oCiphers:
1.42 provos 582: arg = strdelim(&s);
1.40 ho 583: if (!arg || *arg == '\0')
1.32 markus 584: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 585: if (!ciphers_valid(arg))
1.31 markus 586: fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.",
1.93 deraadt 587: filename, linenum, arg ? arg : "<NONE>");
1.25 markus 588: if (*activep && options->ciphers == NULL)
1.38 provos 589: options->ciphers = xstrdup(arg);
1.25 markus 590: break;
591:
1.62 markus 592: case oMacs:
593: arg = strdelim(&s);
594: if (!arg || *arg == '\0')
595: fatal("%.200s line %d: Missing argument.", filename, linenum);
596: if (!mac_valid(arg))
597: fatal("%.200s line %d: Bad SSH2 Mac spec '%s'.",
1.93 deraadt 598: filename, linenum, arg ? arg : "<NONE>");
1.62 markus 599: if (*activep && options->macs == NULL)
600: options->macs = xstrdup(arg);
601: break;
602:
1.76 markus 603: case oHostKeyAlgorithms:
604: arg = strdelim(&s);
605: if (!arg || *arg == '\0')
606: fatal("%.200s line %d: Missing argument.", filename, linenum);
607: if (!key_names_valid2(arg))
608: fatal("%.200s line %d: Bad protocol 2 host key algorithms '%s'.",
1.93 deraadt 609: filename, linenum, arg ? arg : "<NONE>");
1.76 markus 610: if (*activep && options->hostkeyalgorithms == NULL)
611: options->hostkeyalgorithms = xstrdup(arg);
612: break;
613:
1.25 markus 614: case oProtocol:
615: intptr = &options->protocol;
1.42 provos 616: arg = strdelim(&s);
1.40 ho 617: if (!arg || *arg == '\0')
1.32 markus 618: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 619: value = proto_spec(arg);
1.25 markus 620: if (value == SSH_PROTO_UNKNOWN)
621: fatal("%.200s line %d: Bad protocol spec '%s'.",
1.93 deraadt 622: filename, linenum, arg ? arg : "<NONE>");
1.25 markus 623: if (*activep && *intptr == SSH_PROTO_UNKNOWN)
624: *intptr = value;
625: break;
626:
1.17 markus 627: case oLogLevel:
628: intptr = (int *) &options->log_level;
1.42 provos 629: arg = strdelim(&s);
1.38 provos 630: value = log_level_number(arg);
1.95 markus 631: if (value == SYSLOG_LEVEL_NOT_SET)
1.64 millert 632: fatal("%.200s line %d: unsupported log level '%s'",
1.93 deraadt 633: filename, linenum, arg ? arg : "<NONE>");
1.95 markus 634: if (*activep && (LogLevel) *intptr == SYSLOG_LEVEL_NOT_SET)
1.17 markus 635: *intptr = (LogLevel) value;
636: break;
637:
1.88 stevesk 638: case oLocalForward:
1.17 markus 639: case oRemoteForward:
1.42 provos 640: arg = strdelim(&s);
1.40 ho 641: if (!arg || *arg == '\0')
1.88 stevesk 642: fatal("%.200s line %d: Missing port argument.",
643: filename, linenum);
644: if ((fwd_port = a2port(arg)) == 0)
645: fatal("%.200s line %d: Bad listen port.",
646: filename, linenum);
1.42 provos 647: arg = strdelim(&s);
1.40 ho 648: if (!arg || *arg == '\0')
1.17 markus 649: fatal("%.200s line %d: Missing second argument.",
1.88 stevesk 650: filename, linenum);
651: if (sscanf(arg, "%255[^:]:%5[0-9]", buf, sfwd_host_port) != 2 &&
652: sscanf(arg, "%255[^/]/%5[0-9]", buf, sfwd_host_port) != 2)
653: fatal("%.200s line %d: Bad forwarding specification.",
654: filename, linenum);
655: if ((fwd_host_port = a2port(sfwd_host_port)) == 0)
656: fatal("%.200s line %d: Bad forwarding port.",
657: filename, linenum);
658: if (*activep) {
659: if (opcode == oLocalForward)
660: add_local_forward(options, fwd_port, buf,
661: fwd_host_port);
662: else if (opcode == oRemoteForward)
663: add_remote_forward(options, fwd_port, buf,
664: fwd_host_port);
665: }
1.17 markus 666: break;
1.71 markus 667:
668: case oDynamicForward:
669: arg = strdelim(&s);
670: if (!arg || *arg == '\0')
671: fatal("%.200s line %d: Missing port argument.",
672: filename, linenum);
1.74 stevesk 673: fwd_port = a2port(arg);
674: if (fwd_port == 0)
1.71 markus 675: fatal("%.200s line %d: Badly formatted port number.",
676: filename, linenum);
1.87 markus 677: if (*activep)
1.117 markus 678: add_local_forward(options, fwd_port, "socks", 0);
1.72 markus 679: break;
1.17 markus 680:
1.90 stevesk 681: case oClearAllForwardings:
682: intptr = &options->clear_forwardings;
683: goto parse_flag;
684:
1.17 markus 685: case oHost:
686: *activep = 0;
1.42 provos 687: while ((arg = strdelim(&s)) != NULL && *arg != '\0')
1.38 provos 688: if (match_pattern(host, arg)) {
689: debug("Applying options for %.100s", arg);
1.17 markus 690: *activep = 1;
691: break;
692: }
1.42 provos 693: /* Avoid garbage check below, as strdelim is done. */
1.17 markus 694: return 0;
695:
696: case oEscapeChar:
697: intptr = &options->escape_char;
1.42 provos 698: arg = strdelim(&s);
1.40 ho 699: if (!arg || *arg == '\0')
1.17 markus 700: fatal("%.200s line %d: Missing argument.", filename, linenum);
1.38 provos 701: if (arg[0] == '^' && arg[2] == 0 &&
1.51 markus 702: (u_char) arg[1] >= 64 && (u_char) arg[1] < 128)
703: value = (u_char) arg[1] & 31;
1.38 provos 704: else if (strlen(arg) == 1)
1.51 markus 705: value = (u_char) arg[0];
1.38 provos 706: else if (strcmp(arg, "none") == 0)
1.79 stevesk 707: value = SSH_ESCAPECHAR_NONE;
1.17 markus 708: else {
709: fatal("%.200s line %d: Bad escape character.",
1.93 deraadt 710: filename, linenum);
1.17 markus 711: /* NOTREACHED */
712: value = 0; /* Avoid compiler warning. */
713: }
714: if (*activep && *intptr == -1)
715: *intptr = value;
1.112 djm 716: break;
717:
718: case oAddressFamily:
719: arg = strdelim(&s);
1.114 djm 720: intptr = &options->address_family;
1.112 djm 721: if (strcasecmp(arg, "inet") == 0)
1.114 djm 722: value = AF_INET;
1.112 djm 723: else if (strcasecmp(arg, "inet6") == 0)
1.114 djm 724: value = AF_INET6;
1.112 djm 725: else if (strcasecmp(arg, "any") == 0)
1.114 djm 726: value = AF_UNSPEC;
1.112 djm 727: else
728: fatal("Unsupported AddressFamily \"%s\"", arg);
1.114 djm 729: if (*activep && *intptr == -1)
730: *intptr = value;
1.17 markus 731: break;
732:
1.101 markus 733: case oEnableSSHKeysign:
734: intptr = &options->enable_ssh_keysign;
735: goto parse_flag;
736:
1.127 ! markus 737: case oServerAliveInterval:
! 738: intptr = &options->server_alive_interval;
! 739: goto parse_time;
! 740:
! 741: case oServerAliveCountMax:
! 742: intptr = &options->server_alive_count_max;
! 743: goto parse_int;
! 744:
1.96 markus 745: case oDeprecated:
1.98 markus 746: debug("%s line %d: Deprecated option \"%s\"",
1.96 markus 747: filename, linenum, keyword);
1.98 markus 748: return 0;
1.96 markus 749:
1.110 jakob 750: case oUnsupported:
751: error("%s line %d: Unsupported option \"%s\"",
752: filename, linenum, keyword);
753: return 0;
754:
1.17 markus 755: default:
756: fatal("process_config_line: Unimplemented opcode %d", opcode);
757: }
758:
759: /* Check that there is no garbage at end of line. */
1.57 djm 760: if ((arg = strdelim(&s)) != NULL && *arg != '\0') {
1.39 ho 761: fatal("%.200s line %d: garbage at end of line; \"%.200s\".",
1.93 deraadt 762: filename, linenum, arg);
1.39 ho 763: }
1.17 markus 764: return 0;
1.1 deraadt 765: }
766:
767:
1.19 markus 768: /*
769: * Reads the config file and modifies the options accordingly. Options
770: * should already be initialized before this call. This never returns if
1.89 stevesk 771: * there is an error. If the file does not exist, this returns 0.
1.19 markus 772: */
1.1 deraadt 773:
1.89 stevesk 774: int
1.17 markus 775: read_config_file(const char *filename, const char *host, Options *options)
1.1 deraadt 776: {
1.17 markus 777: FILE *f;
778: char line[1024];
779: int active, linenum;
780: int bad_options = 0;
781:
782: /* Open the file. */
783: f = fopen(filename, "r");
784: if (!f)
1.89 stevesk 785: return 0;
1.17 markus 786:
787: debug("Reading configuration data %.200s", filename);
788:
1.19 markus 789: /*
790: * Mark that we are now processing the options. This flag is turned
791: * on/off by Host specifications.
792: */
1.17 markus 793: active = 1;
794: linenum = 0;
795: while (fgets(line, sizeof(line), f)) {
796: /* Update line number counter. */
797: linenum++;
798: if (process_config_line(options, host, line, filename, linenum, &active) != 0)
799: bad_options++;
800: }
801: fclose(f);
802: if (bad_options > 0)
1.64 millert 803: fatal("%s: terminating, %d bad configuration options",
1.93 deraadt 804: filename, bad_options);
1.89 stevesk 805: return 1;
1.1 deraadt 806: }
807:
1.19 markus 808: /*
809: * Initializes options to special values that indicate that they have not yet
810: * been set. Read_config_file will only set options with this value. Options
811: * are processed in the following order: command line, user config file,
812: * system config file. Last, fill_default_options is called.
813: */
1.1 deraadt 814:
1.26 markus 815: void
1.17 markus 816: initialize_options(Options * options)
1.1 deraadt 817: {
1.17 markus 818: memset(options, 'X', sizeof(*options));
819: options->forward_agent = -1;
820: options->forward_x11 = -1;
1.123 markus 821: options->forward_x11_trusted = -1;
1.34 markus 822: options->xauth_location = NULL;
1.17 markus 823: options->gateway_ports = -1;
824: options->use_privileged_port = -1;
825: options->rsa_authentication = -1;
1.50 markus 826: options->pubkey_authentication = -1;
1.78 markus 827: options->challenge_response_authentication = -1;
1.118 markus 828: options->gss_authentication = -1;
829: options->gss_deleg_creds = -1;
1.17 markus 830: options->password_authentication = -1;
1.48 markus 831: options->kbd_interactive_authentication = -1;
832: options->kbd_interactive_devices = NULL;
1.17 markus 833: options->rhosts_rsa_authentication = -1;
1.72 markus 834: options->hostbased_authentication = -1;
1.17 markus 835: options->batch_mode = -1;
836: options->check_host_ip = -1;
837: options->strict_host_key_checking = -1;
838: options->compression = -1;
1.126 markus 839: options->tcp_keep_alive = -1;
1.17 markus 840: options->compression_level = -1;
841: options->port = -1;
1.114 djm 842: options->address_family = -1;
1.17 markus 843: options->connection_attempts = -1;
1.111 djm 844: options->connection_timeout = -1;
1.17 markus 845: options->number_of_password_prompts = -1;
846: options->cipher = -1;
1.25 markus 847: options->ciphers = NULL;
1.62 markus 848: options->macs = NULL;
1.76 markus 849: options->hostkeyalgorithms = NULL;
1.25 markus 850: options->protocol = SSH_PROTO_UNKNOWN;
1.17 markus 851: options->num_identity_files = 0;
852: options->hostname = NULL;
1.52 markus 853: options->host_key_alias = NULL;
1.17 markus 854: options->proxy_command = NULL;
855: options->user = NULL;
856: options->escape_char = -1;
857: options->system_hostfile = NULL;
858: options->user_hostfile = NULL;
1.27 markus 859: options->system_hostfile2 = NULL;
860: options->user_hostfile2 = NULL;
1.17 markus 861: options->num_local_forwards = 0;
862: options->num_remote_forwards = 0;
1.90 stevesk 863: options->clear_forwardings = -1;
1.95 markus 864: options->log_level = SYSLOG_LEVEL_NOT_SET;
1.67 markus 865: options->preferred_authentications = NULL;
1.77 markus 866: options->bind_address = NULL;
1.86 markus 867: options->smartcard_device = NULL;
1.101 markus 868: options->enable_ssh_keysign = - 1;
1.91 markus 869: options->no_host_authentication_for_localhost = - 1;
1.105 markus 870: options->rekey_limit = - 1;
1.107 jakob 871: options->verify_host_key_dns = -1;
1.127 ! markus 872: options->server_alive_interval = -1;
! 873: options->server_alive_count_max = -1;
1.1 deraadt 874: }
875:
1.19 markus 876: /*
877: * Called after processing other sources of option data, this fills those
878: * options for which no value has been specified with their default values.
879: */
1.1 deraadt 880:
1.26 markus 881: void
1.17 markus 882: fill_default_options(Options * options)
1.1 deraadt 883: {
1.61 deraadt 884: int len;
885:
1.17 markus 886: if (options->forward_agent == -1)
1.33 markus 887: options->forward_agent = 0;
1.17 markus 888: if (options->forward_x11 == -1)
1.23 markus 889: options->forward_x11 = 0;
1.123 markus 890: if (options->forward_x11_trusted == -1)
891: options->forward_x11_trusted = 0;
1.34 markus 892: if (options->xauth_location == NULL)
1.80 markus 893: options->xauth_location = _PATH_XAUTH;
1.17 markus 894: if (options->gateway_ports == -1)
895: options->gateway_ports = 0;
896: if (options->use_privileged_port == -1)
1.65 markus 897: options->use_privileged_port = 0;
1.17 markus 898: if (options->rsa_authentication == -1)
899: options->rsa_authentication = 1;
1.50 markus 900: if (options->pubkey_authentication == -1)
901: options->pubkey_authentication = 1;
1.78 markus 902: if (options->challenge_response_authentication == -1)
1.83 markus 903: options->challenge_response_authentication = 1;
1.118 markus 904: if (options->gss_authentication == -1)
1.122 markus 905: options->gss_authentication = 0;
1.118 markus 906: if (options->gss_deleg_creds == -1)
907: options->gss_deleg_creds = 0;
1.17 markus 908: if (options->password_authentication == -1)
909: options->password_authentication = 1;
1.48 markus 910: if (options->kbd_interactive_authentication == -1)
1.59 markus 911: options->kbd_interactive_authentication = 1;
1.17 markus 912: if (options->rhosts_rsa_authentication == -1)
1.99 stevesk 913: options->rhosts_rsa_authentication = 0;
1.72 markus 914: if (options->hostbased_authentication == -1)
915: options->hostbased_authentication = 0;
1.17 markus 916: if (options->batch_mode == -1)
917: options->batch_mode = 0;
918: if (options->check_host_ip == -1)
919: options->check_host_ip = 1;
920: if (options->strict_host_key_checking == -1)
921: options->strict_host_key_checking = 2; /* 2 is default */
922: if (options->compression == -1)
923: options->compression = 0;
1.126 markus 924: if (options->tcp_keep_alive == -1)
925: options->tcp_keep_alive = 1;
1.17 markus 926: if (options->compression_level == -1)
927: options->compression_level = 6;
928: if (options->port == -1)
929: options->port = 0; /* Filled in ssh_connect. */
1.114 djm 930: if (options->address_family == -1)
931: options->address_family = AF_UNSPEC;
1.17 markus 932: if (options->connection_attempts == -1)
1.84 markus 933: options->connection_attempts = 1;
1.17 markus 934: if (options->number_of_password_prompts == -1)
935: options->number_of_password_prompts = 3;
936: /* Selected in ssh_login(). */
937: if (options->cipher == -1)
938: options->cipher = SSH_CIPHER_NOT_SET;
1.31 markus 939: /* options->ciphers, default set in myproposals.h */
1.62 markus 940: /* options->macs, default set in myproposals.h */
1.76 markus 941: /* options->hostkeyalgorithms, default set in myproposals.h */
1.25 markus 942: if (options->protocol == SSH_PROTO_UNKNOWN)
1.69 markus 943: options->protocol = SSH_PROTO_1|SSH_PROTO_2;
1.17 markus 944: if (options->num_identity_files == 0) {
1.50 markus 945: if (options->protocol & SSH_PROTO_1) {
1.61 deraadt 946: len = 2 + strlen(_PATH_SSH_CLIENT_IDENTITY) + 1;
1.50 markus 947: options->identity_files[options->num_identity_files] =
1.61 deraadt 948: xmalloc(len);
949: snprintf(options->identity_files[options->num_identity_files++],
950: len, "~/%.100s", _PATH_SSH_CLIENT_IDENTITY);
1.50 markus 951: }
952: if (options->protocol & SSH_PROTO_2) {
1.63 deraadt 953: len = 2 + strlen(_PATH_SSH_CLIENT_ID_RSA) + 1;
954: options->identity_files[options->num_identity_files] =
955: xmalloc(len);
956: snprintf(options->identity_files[options->num_identity_files++],
957: len, "~/%.100s", _PATH_SSH_CLIENT_ID_RSA);
958:
1.61 deraadt 959: len = 2 + strlen(_PATH_SSH_CLIENT_ID_DSA) + 1;
1.50 markus 960: options->identity_files[options->num_identity_files] =
1.61 deraadt 961: xmalloc(len);
962: snprintf(options->identity_files[options->num_identity_files++],
963: len, "~/%.100s", _PATH_SSH_CLIENT_ID_DSA);
1.50 markus 964: }
1.27 markus 965: }
1.17 markus 966: if (options->escape_char == -1)
967: options->escape_char = '~';
968: if (options->system_hostfile == NULL)
1.55 markus 969: options->system_hostfile = _PATH_SSH_SYSTEM_HOSTFILE;
1.17 markus 970: if (options->user_hostfile == NULL)
1.55 markus 971: options->user_hostfile = _PATH_SSH_USER_HOSTFILE;
1.27 markus 972: if (options->system_hostfile2 == NULL)
1.55 markus 973: options->system_hostfile2 = _PATH_SSH_SYSTEM_HOSTFILE2;
1.27 markus 974: if (options->user_hostfile2 == NULL)
1.55 markus 975: options->user_hostfile2 = _PATH_SSH_USER_HOSTFILE2;
1.95 markus 976: if (options->log_level == SYSLOG_LEVEL_NOT_SET)
1.54 markus 977: options->log_level = SYSLOG_LEVEL_INFO;
1.90 stevesk 978: if (options->clear_forwardings == 1)
979: clear_forwardings(options);
1.91 markus 980: if (options->no_host_authentication_for_localhost == - 1)
981: options->no_host_authentication_for_localhost = 0;
1.101 markus 982: if (options->enable_ssh_keysign == -1)
983: options->enable_ssh_keysign = 0;
1.105 markus 984: if (options->rekey_limit == -1)
985: options->rekey_limit = 0;
1.107 jakob 986: if (options->verify_host_key_dns == -1)
987: options->verify_host_key_dns = 0;
1.127 ! markus 988: if (options->server_alive_interval == -1)
! 989: options->server_alive_interval = 0;
! 990: if (options->server_alive_count_max == -1)
! 991: options->server_alive_count_max = 3;
1.17 markus 992: /* options->proxy_command should not be set by default */
993: /* options->user will be set in the main program if appropriate */
994: /* options->hostname will be set in the main program if appropriate */
1.52 markus 995: /* options->host_key_alias should not be set by default */
1.67 markus 996: /* options->preferred_authentications will be set in ssh */
1.1 deraadt 997: }
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