Annotation of src/usr.bin/ssh/servconf.c, Revision 1.120
1.1 deraadt 1: /*
1.26 deraadt 2: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
3: * All rights reserved
1.34 markus 4: *
1.51 deraadt 5: * As far as I am concerned, the code I have written for this software
6: * can be used freely for any purpose. Any derived versions of this
7: * software must be clearly marked as such, and if the derived work is
8: * incompatible with the protocol description in the RFC file, it must be
9: * called by a name other than "ssh" or "Secure Shell".
1.26 deraadt 10: */
1.1 deraadt 11:
12: #include "includes.h"
1.120 ! jakob 13: RCSID("$OpenBSD: servconf.c,v 1.119 2003/05/15 01:48:10 jakob Exp $");
1.62 markus 14:
1.118 hin 15: #if defined(KRB4)
1.62 markus 16: #include <krb.h>
1.86 dugsong 17: #endif
18: #ifdef AFS
19: #include <kafs.h>
1.62 markus 20: #endif
1.1 deraadt 21:
22: #include "ssh.h"
1.62 markus 23: #include "log.h"
1.1 deraadt 24: #include "servconf.h"
25: #include "xmalloc.h"
1.33 markus 26: #include "compat.h"
1.60 markus 27: #include "pathnames.h"
1.62 markus 28: #include "tildexpand.h"
29: #include "misc.h"
30: #include "cipher.h"
1.66 markus 31: #include "kex.h"
32: #include "mac.h"
1.1 deraadt 33:
1.84 itojun 34: static void add_listen_addr(ServerOptions *, char *, u_short);
35: static void add_one_listen_addr(ServerOptions *, char *, u_short);
1.29 markus 36:
1.62 markus 37: /* AF_UNSPEC or AF_INET or AF_INET6 */
38: extern int IPv4or6;
1.102 provos 39: /* Use of privilege separation or not */
40: extern int use_privsep;
1.62 markus 41:
1.1 deraadt 42: /* Initializes the server options to their default values. */
43:
1.34 markus 44: void
1.25 markus 45: initialize_server_options(ServerOptions *options)
1.1 deraadt 46: {
1.25 markus 47: memset(options, 0, sizeof(*options));
1.29 markus 48: options->num_ports = 0;
49: options->ports_from_cmdline = 0;
50: options->listen_addrs = NULL;
1.54 markus 51: options->num_host_key_files = 0;
1.36 markus 52: options->pid_file = NULL;
1.25 markus 53: options->server_key_bits = -1;
54: options->login_grace_time = -1;
55: options->key_regeneration_time = -1;
1.67 markus 56: options->permit_root_login = PERMIT_NOT_SET;
1.25 markus 57: options->ignore_rhosts = -1;
58: options->ignore_user_known_hosts = -1;
59: options->print_motd = -1;
1.72 stevesk 60: options->print_lastlog = -1;
1.25 markus 61: options->x11_forwarding = -1;
62: options->x11_display_offset = -1;
1.99 stevesk 63: options->x11_use_localhost = -1;
1.42 markus 64: options->xauth_location = NULL;
1.25 markus 65: options->strict_modes = -1;
66: options->keepalives = -1;
1.101 markus 67: options->log_facility = SYSLOG_FACILITY_NOT_SET;
68: options->log_level = SYSLOG_LEVEL_NOT_SET;
1.25 markus 69: options->rhosts_authentication = -1;
70: options->rhosts_rsa_authentication = -1;
1.75 markus 71: options->hostbased_authentication = -1;
72: options->hostbased_uses_name_from_packet_only = -1;
1.25 markus 73: options->rsa_authentication = -1;
1.54 markus 74: options->pubkey_authentication = -1;
1.25 markus 75: options->kerberos_authentication = -1;
76: options->kerberos_or_local_passwd = -1;
77: options->kerberos_ticket_cleanup = -1;
1.85 dugsong 78: options->kerberos_tgt_passing = -1;
1.25 markus 79: options->afs_token_passing = -1;
80: options->password_authentication = -1;
1.52 markus 81: options->kbd_interactive_authentication = -1;
1.80 markus 82: options->challenge_response_authentication = -1;
1.25 markus 83: options->permit_empty_passwd = -1;
1.113 markus 84: options->permit_user_env = -1;
1.25 markus 85: options->use_login = -1;
1.111 markus 86: options->compression = -1;
1.53 markus 87: options->allow_tcp_forwarding = -1;
1.25 markus 88: options->num_allow_users = 0;
89: options->num_deny_users = 0;
90: options->num_allow_groups = 0;
91: options->num_deny_groups = 0;
1.33 markus 92: options->ciphers = NULL;
1.66 markus 93: options->macs = NULL;
1.33 markus 94: options->protocol = SSH_PROTO_UNKNOWN;
1.38 markus 95: options->gateway_ports = -1;
1.43 jakob 96: options->num_subsystems = 0;
1.50 markus 97: options->max_startups_begin = -1;
98: options->max_startups_rate = -1;
1.46 markus 99: options->max_startups = -1;
1.57 markus 100: options->banner = NULL;
1.100 markus 101: options->verify_reverse_mapping = -1;
1.77 beck 102: options->client_alive_interval = -1;
103: options->client_alive_count_max = -1;
1.82 markus 104: options->authorized_keys_file = NULL;
105: options->authorized_keys_file2 = NULL;
1.102 provos 106:
107: /* Needs to be accessable in many places */
108: use_privsep = -1;
1.1 deraadt 109: }
110:
1.34 markus 111: void
1.25 markus 112: fill_default_server_options(ServerOptions *options)
1.1 deraadt 113: {
1.54 markus 114: if (options->protocol == SSH_PROTO_UNKNOWN)
115: options->protocol = SSH_PROTO_1|SSH_PROTO_2;
116: if (options->num_host_key_files == 0) {
117: /* fill default hostkeys for protocols */
118: if (options->protocol & SSH_PROTO_1)
1.97 stevesk 119: options->host_key_files[options->num_host_key_files++] =
120: _PATH_HOST_KEY_FILE;
121: if (options->protocol & SSH_PROTO_2) {
122: options->host_key_files[options->num_host_key_files++] =
123: _PATH_HOST_RSA_KEY_FILE;
124: options->host_key_files[options->num_host_key_files++] =
125: _PATH_HOST_DSA_KEY_FILE;
126: }
1.54 markus 127: }
1.29 markus 128: if (options->num_ports == 0)
129: options->ports[options->num_ports++] = SSH_DEFAULT_PORT;
130: if (options->listen_addrs == NULL)
1.76 stevesk 131: add_listen_addr(options, NULL, 0);
1.36 markus 132: if (options->pid_file == NULL)
1.60 markus 133: options->pid_file = _PATH_SSH_DAEMON_PID_FILE;
1.25 markus 134: if (options->server_key_bits == -1)
135: options->server_key_bits = 768;
136: if (options->login_grace_time == -1)
1.115 stevesk 137: options->login_grace_time = 120;
1.25 markus 138: if (options->key_regeneration_time == -1)
139: options->key_regeneration_time = 3600;
1.67 markus 140: if (options->permit_root_login == PERMIT_NOT_SET)
141: options->permit_root_login = PERMIT_YES;
1.25 markus 142: if (options->ignore_rhosts == -1)
1.30 markus 143: options->ignore_rhosts = 1;
1.25 markus 144: if (options->ignore_user_known_hosts == -1)
145: options->ignore_user_known_hosts = 0;
146: if (options->print_motd == -1)
147: options->print_motd = 1;
1.72 stevesk 148: if (options->print_lastlog == -1)
149: options->print_lastlog = 1;
1.25 markus 150: if (options->x11_forwarding == -1)
1.30 markus 151: options->x11_forwarding = 0;
1.25 markus 152: if (options->x11_display_offset == -1)
1.30 markus 153: options->x11_display_offset = 10;
1.99 stevesk 154: if (options->x11_use_localhost == -1)
155: options->x11_use_localhost = 1;
1.42 markus 156: if (options->xauth_location == NULL)
1.83 markus 157: options->xauth_location = _PATH_XAUTH;
1.25 markus 158: if (options->strict_modes == -1)
159: options->strict_modes = 1;
160: if (options->keepalives == -1)
161: options->keepalives = 1;
1.101 markus 162: if (options->log_facility == SYSLOG_FACILITY_NOT_SET)
1.25 markus 163: options->log_facility = SYSLOG_FACILITY_AUTH;
1.101 markus 164: if (options->log_level == SYSLOG_LEVEL_NOT_SET)
1.58 markus 165: options->log_level = SYSLOG_LEVEL_INFO;
1.25 markus 166: if (options->rhosts_authentication == -1)
167: options->rhosts_authentication = 0;
168: if (options->rhosts_rsa_authentication == -1)
1.30 markus 169: options->rhosts_rsa_authentication = 0;
1.75 markus 170: if (options->hostbased_authentication == -1)
171: options->hostbased_authentication = 0;
172: if (options->hostbased_uses_name_from_packet_only == -1)
173: options->hostbased_uses_name_from_packet_only = 0;
1.25 markus 174: if (options->rsa_authentication == -1)
175: options->rsa_authentication = 1;
1.54 markus 176: if (options->pubkey_authentication == -1)
177: options->pubkey_authentication = 1;
1.25 markus 178: if (options->kerberos_authentication == -1)
1.107 markus 179: options->kerberos_authentication = 0;
1.25 markus 180: if (options->kerberos_or_local_passwd == -1)
181: options->kerberos_or_local_passwd = 1;
182: if (options->kerberos_ticket_cleanup == -1)
1.120 ! jakob 183: #if defined(KRB4) || defined(KRB5)
1.25 markus 184: options->kerberos_ticket_cleanup = 1;
1.120 ! jakob 185: #else
! 186: options->kerberos_ticket_cleanup = 0;
! 187: #endif
1.25 markus 188: if (options->kerberos_tgt_passing == -1)
189: options->kerberos_tgt_passing = 0;
190: if (options->afs_token_passing == -1)
1.106 deraadt 191: options->afs_token_passing = 0;
1.25 markus 192: if (options->password_authentication == -1)
193: options->password_authentication = 1;
1.52 markus 194: if (options->kbd_interactive_authentication == -1)
195: options->kbd_interactive_authentication = 0;
1.80 markus 196: if (options->challenge_response_authentication == -1)
197: options->challenge_response_authentication = 1;
1.25 markus 198: if (options->permit_empty_passwd == -1)
1.30 markus 199: options->permit_empty_passwd = 0;
1.113 markus 200: if (options->permit_user_env == -1)
201: options->permit_user_env = 0;
1.25 markus 202: if (options->use_login == -1)
203: options->use_login = 0;
1.111 markus 204: if (options->compression == -1)
205: options->compression = 1;
1.53 markus 206: if (options->allow_tcp_forwarding == -1)
207: options->allow_tcp_forwarding = 1;
1.38 markus 208: if (options->gateway_ports == -1)
209: options->gateway_ports = 0;
1.46 markus 210: if (options->max_startups == -1)
211: options->max_startups = 10;
1.50 markus 212: if (options->max_startups_rate == -1)
213: options->max_startups_rate = 100; /* 100% */
214: if (options->max_startups_begin == -1)
215: options->max_startups_begin = options->max_startups;
1.100 markus 216: if (options->verify_reverse_mapping == -1)
217: options->verify_reverse_mapping = 0;
1.77 beck 218: if (options->client_alive_interval == -1)
1.95 deraadt 219: options->client_alive_interval = 0;
1.77 beck 220: if (options->client_alive_count_max == -1)
221: options->client_alive_count_max = 3;
1.90 markus 222: if (options->authorized_keys_file2 == NULL) {
223: /* authorized_keys_file2 falls back to authorized_keys_file */
224: if (options->authorized_keys_file != NULL)
225: options->authorized_keys_file2 = options->authorized_keys_file;
226: else
227: options->authorized_keys_file2 = _PATH_SSH_USER_PERMITTED_KEYS2;
228: }
229: if (options->authorized_keys_file == NULL)
230: options->authorized_keys_file = _PATH_SSH_USER_PERMITTED_KEYS;
1.102 provos 231:
1.110 markus 232: /* Turn privilege separation on by default */
1.102 provos 233: if (use_privsep == -1)
1.110 markus 234: use_privsep = 1;
1.1 deraadt 235: }
236:
237: /* Keyword tokens. */
1.25 markus 238: typedef enum {
239: sBadOption, /* == unknown option */
240: sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime,
241: sPermitRootLogin, sLogFacility, sLogLevel,
242: sRhostsAuthentication, sRhostsRSAAuthentication, sRSAAuthentication,
243: sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup,
1.119 jakob 244: sKerberosTgtPassing, sAFSTokenPassing, sChallengeResponseAuthentication,
1.52 markus 245: sPasswordAuthentication, sKbdInteractiveAuthentication, sListenAddress,
1.72 stevesk 246: sPrintMotd, sPrintLastLog, sIgnoreRhosts,
1.99 stevesk 247: sX11Forwarding, sX11DisplayOffset, sX11UseLocalhost,
1.89 jakob 248: sStrictModes, sEmptyPasswd, sKeepAlives,
1.113 markus 249: sPermitUserEnvironment, sUseLogin, sAllowTcpForwarding, sCompression,
1.53 markus 250: sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups,
1.66 markus 251: sIgnoreUserKnownHosts, sCiphers, sMacs, sProtocol, sPidFile,
1.54 markus 252: sGatewayPorts, sPubkeyAuthentication, sXAuthLocation, sSubsystem, sMaxStartups,
1.100 markus 253: sBanner, sVerifyReverseMapping, sHostbasedAuthentication,
1.95 deraadt 254: sHostbasedUsesNameFromPacketOnly, sClientAliveInterval,
1.89 jakob 255: sClientAliveCountMax, sAuthorizedKeysFile, sAuthorizedKeysFile2,
1.105 stevesk 256: sUsePrivilegeSeparation,
1.89 jakob 257: sDeprecated
1.1 deraadt 258: } ServerOpCodes;
259:
260: /* Textual representation of the tokens. */
1.25 markus 261: static struct {
262: const char *name;
263: ServerOpCodes opcode;
264: } keywords[] = {
265: { "port", sPort },
266: { "hostkey", sHostKeyFile },
1.54 markus 267: { "hostdsakey", sHostKeyFile }, /* alias */
1.65 stevesk 268: { "pidfile", sPidFile },
1.25 markus 269: { "serverkeybits", sServerKeyBits },
270: { "logingracetime", sLoginGraceTime },
271: { "keyregenerationinterval", sKeyRegenerationTime },
272: { "permitrootlogin", sPermitRootLogin },
273: { "syslogfacility", sLogFacility },
274: { "loglevel", sLogLevel },
275: { "rhostsauthentication", sRhostsAuthentication },
276: { "rhostsrsaauthentication", sRhostsRSAAuthentication },
1.75 markus 277: { "hostbasedauthentication", sHostbasedAuthentication },
278: { "hostbasedusesnamefrompacketonly", sHostbasedUsesNameFromPacketOnly },
1.25 markus 279: { "rsaauthentication", sRSAAuthentication },
1.54 markus 280: { "pubkeyauthentication", sPubkeyAuthentication },
281: { "dsaauthentication", sPubkeyAuthentication }, /* alias */
1.25 markus 282: { "kerberosauthentication", sKerberosAuthentication },
283: { "kerberosorlocalpasswd", sKerberosOrLocalPasswd },
284: { "kerberosticketcleanup", sKerberosTicketCleanup },
1.85 dugsong 285: { "kerberostgtpassing", sKerberosTgtPassing },
1.25 markus 286: { "afstokenpassing", sAFSTokenPassing },
287: { "passwordauthentication", sPasswordAuthentication },
1.52 markus 288: { "kbdinteractiveauthentication", sKbdInteractiveAuthentication },
1.63 markus 289: { "challengeresponseauthentication", sChallengeResponseAuthentication },
290: { "skeyauthentication", sChallengeResponseAuthentication }, /* alias */
1.89 jakob 291: { "checkmail", sDeprecated },
1.25 markus 292: { "listenaddress", sListenAddress },
293: { "printmotd", sPrintMotd },
1.72 stevesk 294: { "printlastlog", sPrintLastLog },
1.25 markus 295: { "ignorerhosts", sIgnoreRhosts },
296: { "ignoreuserknownhosts", sIgnoreUserKnownHosts },
297: { "x11forwarding", sX11Forwarding },
298: { "x11displayoffset", sX11DisplayOffset },
1.99 stevesk 299: { "x11uselocalhost", sX11UseLocalhost },
1.42 markus 300: { "xauthlocation", sXAuthLocation },
1.25 markus 301: { "strictmodes", sStrictModes },
302: { "permitemptypasswords", sEmptyPasswd },
1.113 markus 303: { "permituserenvironment", sPermitUserEnvironment },
1.25 markus 304: { "uselogin", sUseLogin },
1.111 markus 305: { "compression", sCompression },
1.25 markus 306: { "keepalive", sKeepAlives },
1.53 markus 307: { "allowtcpforwarding", sAllowTcpForwarding },
1.25 markus 308: { "allowusers", sAllowUsers },
309: { "denyusers", sDenyUsers },
310: { "allowgroups", sAllowGroups },
311: { "denygroups", sDenyGroups },
1.33 markus 312: { "ciphers", sCiphers },
1.66 markus 313: { "macs", sMacs },
1.33 markus 314: { "protocol", sProtocol },
1.38 markus 315: { "gatewayports", sGatewayPorts },
1.43 jakob 316: { "subsystem", sSubsystem },
1.46 markus 317: { "maxstartups", sMaxStartups },
1.57 markus 318: { "banner", sBanner },
1.100 markus 319: { "verifyreversemapping", sVerifyReverseMapping },
320: { "reversemappingcheck", sVerifyReverseMapping },
1.77 beck 321: { "clientaliveinterval", sClientAliveInterval },
322: { "clientalivecountmax", sClientAliveCountMax },
1.82 markus 323: { "authorizedkeysfile", sAuthorizedKeysFile },
324: { "authorizedkeysfile2", sAuthorizedKeysFile2 },
1.102 provos 325: { "useprivilegeseparation", sUsePrivilegeSeparation},
1.92 stevesk 326: { NULL, sBadOption }
1.1 deraadt 327: };
328:
1.27 markus 329: /*
1.73 stevesk 330: * Returns the number of the token pointed to by cp or sBadOption.
1.27 markus 331: */
1.1 deraadt 332:
1.34 markus 333: static ServerOpCodes
1.25 markus 334: parse_token(const char *cp, const char *filename,
335: int linenum)
1.1 deraadt 336: {
1.55 markus 337: u_int i;
1.1 deraadt 338:
1.25 markus 339: for (i = 0; keywords[i].name; i++)
1.28 markus 340: if (strcasecmp(cp, keywords[i].name) == 0)
1.25 markus 341: return keywords[i].opcode;
342:
1.78 stevesk 343: error("%s: line %d: Bad configuration option: %s",
344: filename, linenum, cp);
1.25 markus 345: return sBadOption;
1.1 deraadt 346: }
347:
1.84 itojun 348: static void
1.76 stevesk 349: add_listen_addr(ServerOptions *options, char *addr, u_short port)
1.74 stevesk 350: {
351: int i;
352:
353: if (options->num_ports == 0)
354: options->ports[options->num_ports++] = SSH_DEFAULT_PORT;
1.76 stevesk 355: if (port == 0)
1.74 stevesk 356: for (i = 0; i < options->num_ports; i++)
357: add_one_listen_addr(options, addr, options->ports[i]);
358: else
1.76 stevesk 359: add_one_listen_addr(options, addr, port);
1.74 stevesk 360: }
361:
1.84 itojun 362: static void
1.74 stevesk 363: add_one_listen_addr(ServerOptions *options, char *addr, u_short port)
1.29 markus 364: {
365: struct addrinfo hints, *ai, *aitop;
366: char strport[NI_MAXSERV];
367: int gaierr;
368:
1.74 stevesk 369: memset(&hints, 0, sizeof(hints));
370: hints.ai_family = IPv4or6;
371: hints.ai_socktype = SOCK_STREAM;
372: hints.ai_flags = (addr == NULL) ? AI_PASSIVE : 0;
1.112 deraadt 373: snprintf(strport, sizeof strport, "%u", port);
1.74 stevesk 374: if ((gaierr = getaddrinfo(addr, strport, &hints, &aitop)) != 0)
375: fatal("bad addr or host: %s (%s)",
376: addr ? addr : "<NULL>",
377: gai_strerror(gaierr));
378: for (ai = aitop; ai->ai_next; ai = ai->ai_next)
379: ;
380: ai->ai_next = options->listen_addrs;
381: options->listen_addrs = aitop;
1.29 markus 382: }
383:
1.94 markus 384: int
385: process_server_config_line(ServerOptions *options, char *line,
386: const char *filename, int linenum)
1.1 deraadt 387: {
1.74 stevesk 388: char *cp, **charptr, *arg, *p;
1.112 deraadt 389: int *intptr, value, i, n;
1.25 markus 390: ServerOpCodes opcode;
391:
1.94 markus 392: cp = line;
393: arg = strdelim(&cp);
394: /* Ignore leading whitespace */
395: if (*arg == '\0')
396: arg = strdelim(&cp);
397: if (!arg || !*arg || *arg == '#')
398: return 0;
399: intptr = NULL;
400: charptr = NULL;
401: opcode = parse_token(arg, filename, linenum);
402: switch (opcode) {
403: case sBadOption:
404: return -1;
405: case sPort:
406: /* ignore ports from configfile if cmdline specifies ports */
407: if (options->ports_from_cmdline)
408: return 0;
409: if (options->listen_addrs != NULL)
410: fatal("%s line %d: ports must be specified before "
1.98 stevesk 411: "ListenAddress.", filename, linenum);
1.94 markus 412: if (options->num_ports >= MAX_PORTS)
413: fatal("%s line %d: too many ports.",
414: filename, linenum);
1.48 provos 415: arg = strdelim(&cp);
1.94 markus 416: if (!arg || *arg == '\0')
417: fatal("%s line %d: missing port number.",
418: filename, linenum);
419: options->ports[options->num_ports++] = a2port(arg);
420: if (options->ports[options->num_ports-1] == 0)
421: fatal("%s line %d: Badly formatted port number.",
422: filename, linenum);
423: break;
1.29 markus 424:
1.94 markus 425: case sServerKeyBits:
426: intptr = &options->server_key_bits;
1.25 markus 427: parse_int:
1.94 markus 428: arg = strdelim(&cp);
429: if (!arg || *arg == '\0')
430: fatal("%s line %d: missing integer value.",
431: filename, linenum);
432: value = atoi(arg);
433: if (*intptr == -1)
434: *intptr = value;
435: break;
1.25 markus 436:
1.94 markus 437: case sLoginGraceTime:
438: intptr = &options->login_grace_time;
1.81 stevesk 439: parse_time:
1.94 markus 440: arg = strdelim(&cp);
441: if (!arg || *arg == '\0')
442: fatal("%s line %d: missing time value.",
443: filename, linenum);
444: if ((value = convtime(arg)) == -1)
445: fatal("%s line %d: invalid time value.",
446: filename, linenum);
447: if (*intptr == -1)
448: *intptr = value;
449: break;
450:
451: case sKeyRegenerationTime:
452: intptr = &options->key_regeneration_time;
453: goto parse_time;
454:
455: case sListenAddress:
456: arg = strdelim(&cp);
457: if (!arg || *arg == '\0' || strncmp(arg, "[]", 2) == 0)
458: fatal("%s line %d: missing inet addr.",
459: filename, linenum);
460: if (*arg == '[') {
461: if ((p = strchr(arg, ']')) == NULL)
462: fatal("%s line %d: bad ipv6 inet addr usage.",
463: filename, linenum);
464: arg++;
465: memmove(p, p+1, strlen(p+1)+1);
466: } else if (((p = strchr(arg, ':')) == NULL) ||
467: (strchr(p+1, ':') != NULL)) {
468: add_listen_addr(options, arg, 0);
1.81 stevesk 469: break;
1.94 markus 470: }
471: if (*p == ':') {
472: u_short port;
1.25 markus 473:
1.94 markus 474: p++;
475: if (*p == '\0')
476: fatal("%s line %d: bad inet addr:port usage.",
477: filename, linenum);
478: else {
479: *(p-1) = '\0';
480: if ((port = a2port(p)) == 0)
481: fatal("%s line %d: bad port number.",
1.74 stevesk 482: filename, linenum);
1.94 markus 483: add_listen_addr(options, arg, port);
1.74 stevesk 484: }
1.94 markus 485: } else if (*p == '\0')
486: add_listen_addr(options, arg, 0);
487: else
488: fatal("%s line %d: bad inet addr usage.",
489: filename, linenum);
490: break;
491:
492: case sHostKeyFile:
493: intptr = &options->num_host_key_files;
494: if (*intptr >= MAX_HOSTKEYS)
495: fatal("%s line %d: too many host keys specified (max %d).",
496: filename, linenum, MAX_HOSTKEYS);
497: charptr = &options->host_key_files[*intptr];
498: parse_filename:
499: arg = strdelim(&cp);
500: if (!arg || *arg == '\0')
501: fatal("%s line %d: missing file name.",
502: filename, linenum);
503: if (*charptr == NULL) {
504: *charptr = tilde_expand_filename(arg, getuid());
505: /* increase optional counter */
506: if (intptr != NULL)
507: *intptr = *intptr + 1;
508: }
509: break;
1.76 stevesk 510:
1.94 markus 511: case sPidFile:
512: charptr = &options->pid_file;
513: goto parse_filename;
1.25 markus 514:
1.94 markus 515: case sPermitRootLogin:
516: intptr = &options->permit_root_login;
517: arg = strdelim(&cp);
518: if (!arg || *arg == '\0')
519: fatal("%s line %d: missing yes/"
520: "without-password/forced-commands-only/no "
521: "argument.", filename, linenum);
522: value = 0; /* silence compiler */
523: if (strcmp(arg, "without-password") == 0)
524: value = PERMIT_NO_PASSWD;
525: else if (strcmp(arg, "forced-commands-only") == 0)
526: value = PERMIT_FORCED_ONLY;
527: else if (strcmp(arg, "yes") == 0)
528: value = PERMIT_YES;
529: else if (strcmp(arg, "no") == 0)
530: value = PERMIT_NO;
531: else
532: fatal("%s line %d: Bad yes/"
533: "without-password/forced-commands-only/no "
534: "argument: %s", filename, linenum, arg);
535: if (*intptr == -1)
536: *intptr = value;
537: break;
1.36 markus 538:
1.94 markus 539: case sIgnoreRhosts:
540: intptr = &options->ignore_rhosts;
1.25 markus 541: parse_flag:
1.94 markus 542: arg = strdelim(&cp);
543: if (!arg || *arg == '\0')
544: fatal("%s line %d: missing yes/no argument.",
545: filename, linenum);
546: value = 0; /* silence compiler */
547: if (strcmp(arg, "yes") == 0)
548: value = 1;
549: else if (strcmp(arg, "no") == 0)
550: value = 0;
551: else
552: fatal("%s line %d: Bad yes/no argument: %s",
553: filename, linenum, arg);
554: if (*intptr == -1)
555: *intptr = value;
556: break;
557:
558: case sIgnoreUserKnownHosts:
559: intptr = &options->ignore_user_known_hosts;
560: goto parse_flag;
561:
562: case sRhostsAuthentication:
563: intptr = &options->rhosts_authentication;
564: goto parse_flag;
565:
566: case sRhostsRSAAuthentication:
567: intptr = &options->rhosts_rsa_authentication;
568: goto parse_flag;
569:
570: case sHostbasedAuthentication:
571: intptr = &options->hostbased_authentication;
572: goto parse_flag;
573:
574: case sHostbasedUsesNameFromPacketOnly:
575: intptr = &options->hostbased_uses_name_from_packet_only;
576: goto parse_flag;
577:
578: case sRSAAuthentication:
579: intptr = &options->rsa_authentication;
580: goto parse_flag;
581:
582: case sPubkeyAuthentication:
583: intptr = &options->pubkey_authentication;
584: goto parse_flag;
1.119 jakob 585:
1.94 markus 586: case sKerberosAuthentication:
587: intptr = &options->kerberos_authentication;
588: goto parse_flag;
589:
590: case sKerberosOrLocalPasswd:
591: intptr = &options->kerberos_or_local_passwd;
592: goto parse_flag;
593:
594: case sKerberosTicketCleanup:
595: intptr = &options->kerberos_ticket_cleanup;
596: goto parse_flag;
1.119 jakob 597:
1.94 markus 598: case sKerberosTgtPassing:
599: intptr = &options->kerberos_tgt_passing;
600: goto parse_flag;
1.119 jakob 601:
1.94 markus 602: case sAFSTokenPassing:
603: intptr = &options->afs_token_passing;
604: goto parse_flag;
605:
606: case sPasswordAuthentication:
607: intptr = &options->password_authentication;
608: goto parse_flag;
609:
610: case sKbdInteractiveAuthentication:
611: intptr = &options->kbd_interactive_authentication;
612: goto parse_flag;
613:
614: case sChallengeResponseAuthentication:
615: intptr = &options->challenge_response_authentication;
616: goto parse_flag;
617:
618: case sPrintMotd:
619: intptr = &options->print_motd;
620: goto parse_flag;
621:
622: case sPrintLastLog:
623: intptr = &options->print_lastlog;
624: goto parse_flag;
625:
626: case sX11Forwarding:
627: intptr = &options->x11_forwarding;
628: goto parse_flag;
629:
630: case sX11DisplayOffset:
631: intptr = &options->x11_display_offset;
632: goto parse_int;
1.99 stevesk 633:
634: case sX11UseLocalhost:
635: intptr = &options->x11_use_localhost;
636: goto parse_flag;
1.94 markus 637:
638: case sXAuthLocation:
639: charptr = &options->xauth_location;
640: goto parse_filename;
641:
642: case sStrictModes:
643: intptr = &options->strict_modes;
644: goto parse_flag;
645:
646: case sKeepAlives:
647: intptr = &options->keepalives;
648: goto parse_flag;
649:
650: case sEmptyPasswd:
651: intptr = &options->permit_empty_passwd;
1.113 markus 652: goto parse_flag;
653:
654: case sPermitUserEnvironment:
655: intptr = &options->permit_user_env;
1.94 markus 656: goto parse_flag;
657:
658: case sUseLogin:
659: intptr = &options->use_login;
1.111 markus 660: goto parse_flag;
661:
662: case sCompression:
663: intptr = &options->compression;
1.94 markus 664: goto parse_flag;
665:
666: case sGatewayPorts:
667: intptr = &options->gateway_ports;
668: goto parse_flag;
1.25 markus 669:
1.100 markus 670: case sVerifyReverseMapping:
671: intptr = &options->verify_reverse_mapping;
1.94 markus 672: goto parse_flag;
1.53 markus 673:
1.94 markus 674: case sLogFacility:
675: intptr = (int *) &options->log_facility;
676: arg = strdelim(&cp);
677: value = log_facility_number(arg);
1.101 markus 678: if (value == SYSLOG_FACILITY_NOT_SET)
1.94 markus 679: fatal("%.200s line %d: unsupported log facility '%s'",
680: filename, linenum, arg ? arg : "<NONE>");
681: if (*intptr == -1)
682: *intptr = (SyslogFacility) value;
683: break;
1.25 markus 684:
1.94 markus 685: case sLogLevel:
686: intptr = (int *) &options->log_level;
687: arg = strdelim(&cp);
688: value = log_level_number(arg);
1.101 markus 689: if (value == SYSLOG_LEVEL_NOT_SET)
1.94 markus 690: fatal("%.200s line %d: unsupported log level '%s'",
691: filename, linenum, arg ? arg : "<NONE>");
692: if (*intptr == -1)
693: *intptr = (LogLevel) value;
694: break;
695:
696: case sAllowTcpForwarding:
697: intptr = &options->allow_tcp_forwarding;
698: goto parse_flag;
1.102 provos 699:
700: case sUsePrivilegeSeparation:
701: intptr = &use_privsep;
702: goto parse_flag;
1.94 markus 703:
704: case sAllowUsers:
705: while ((arg = strdelim(&cp)) && *arg != '\0') {
706: if (options->num_allow_users >= MAX_ALLOW_USERS)
707: fatal("%s line %d: too many allow users.",
708: filename, linenum);
1.112 deraadt 709: options->allow_users[options->num_allow_users++] =
710: xstrdup(arg);
1.94 markus 711: }
712: break;
1.25 markus 713:
1.94 markus 714: case sDenyUsers:
715: while ((arg = strdelim(&cp)) && *arg != '\0') {
716: if (options->num_deny_users >= MAX_DENY_USERS)
717: fatal( "%s line %d: too many deny users.",
718: filename, linenum);
1.112 deraadt 719: options->deny_users[options->num_deny_users++] =
720: xstrdup(arg);
1.94 markus 721: }
722: break;
1.25 markus 723:
1.94 markus 724: case sAllowGroups:
725: while ((arg = strdelim(&cp)) && *arg != '\0') {
726: if (options->num_allow_groups >= MAX_ALLOW_GROUPS)
727: fatal("%s line %d: too many allow groups.",
728: filename, linenum);
1.112 deraadt 729: options->allow_groups[options->num_allow_groups++] =
730: xstrdup(arg);
1.94 markus 731: }
732: break;
1.33 markus 733:
1.94 markus 734: case sDenyGroups:
735: while ((arg = strdelim(&cp)) && *arg != '\0') {
736: if (options->num_deny_groups >= MAX_DENY_GROUPS)
737: fatal("%s line %d: too many deny groups.",
738: filename, linenum);
739: options->deny_groups[options->num_deny_groups++] = xstrdup(arg);
740: }
741: break;
1.66 markus 742:
1.94 markus 743: case sCiphers:
744: arg = strdelim(&cp);
745: if (!arg || *arg == '\0')
746: fatal("%s line %d: Missing argument.", filename, linenum);
747: if (!ciphers_valid(arg))
748: fatal("%s line %d: Bad SSH2 cipher spec '%s'.",
749: filename, linenum, arg ? arg : "<NONE>");
750: if (options->ciphers == NULL)
751: options->ciphers = xstrdup(arg);
752: break;
1.33 markus 753:
1.94 markus 754: case sMacs:
755: arg = strdelim(&cp);
756: if (!arg || *arg == '\0')
757: fatal("%s line %d: Missing argument.", filename, linenum);
758: if (!mac_valid(arg))
759: fatal("%s line %d: Bad SSH2 mac spec '%s'.",
760: filename, linenum, arg ? arg : "<NONE>");
761: if (options->macs == NULL)
762: options->macs = xstrdup(arg);
763: break;
1.43 jakob 764:
1.94 markus 765: case sProtocol:
766: intptr = &options->protocol;
767: arg = strdelim(&cp);
768: if (!arg || *arg == '\0')
769: fatal("%s line %d: Missing argument.", filename, linenum);
770: value = proto_spec(arg);
771: if (value == SSH_PROTO_UNKNOWN)
772: fatal("%s line %d: Bad protocol spec '%s'.",
1.95 deraadt 773: filename, linenum, arg ? arg : "<NONE>");
1.94 markus 774: if (*intptr == SSH_PROTO_UNKNOWN)
775: *intptr = value;
776: break;
777:
778: case sSubsystem:
779: if (options->num_subsystems >= MAX_SUBSYSTEMS) {
780: fatal("%s line %d: too many subsystems defined.",
1.95 deraadt 781: filename, linenum);
1.94 markus 782: }
783: arg = strdelim(&cp);
784: if (!arg || *arg == '\0')
785: fatal("%s line %d: Missing subsystem name.",
1.95 deraadt 786: filename, linenum);
1.94 markus 787: for (i = 0; i < options->num_subsystems; i++)
788: if (strcmp(arg, options->subsystem_name[i]) == 0)
789: fatal("%s line %d: Subsystem '%s' already defined.",
1.95 deraadt 790: filename, linenum, arg);
1.94 markus 791: options->subsystem_name[options->num_subsystems] = xstrdup(arg);
792: arg = strdelim(&cp);
793: if (!arg || *arg == '\0')
794: fatal("%s line %d: Missing subsystem command.",
1.95 deraadt 795: filename, linenum);
1.94 markus 796: options->subsystem_command[options->num_subsystems] = xstrdup(arg);
797: options->num_subsystems++;
798: break;
1.46 markus 799:
1.94 markus 800: case sMaxStartups:
801: arg = strdelim(&cp);
802: if (!arg || *arg == '\0')
803: fatal("%s line %d: Missing MaxStartups spec.",
1.95 deraadt 804: filename, linenum);
1.94 markus 805: if ((n = sscanf(arg, "%d:%d:%d",
806: &options->max_startups_begin,
807: &options->max_startups_rate,
808: &options->max_startups)) == 3) {
809: if (options->max_startups_begin >
810: options->max_startups ||
811: options->max_startups_rate > 100 ||
812: options->max_startups_rate < 1)
1.50 markus 813: fatal("%s line %d: Illegal MaxStartups spec.",
1.87 stevesk 814: filename, linenum);
1.94 markus 815: } else if (n != 1)
816: fatal("%s line %d: Illegal MaxStartups spec.",
817: filename, linenum);
818: else
819: options->max_startups = options->max_startups_begin;
820: break;
821:
822: case sBanner:
823: charptr = &options->banner;
824: goto parse_filename;
825: /*
826: * These options can contain %X options expanded at
827: * connect time, so that you can specify paths like:
828: *
829: * AuthorizedKeysFile /etc/ssh_keys/%u
830: */
831: case sAuthorizedKeysFile:
832: case sAuthorizedKeysFile2:
833: charptr = (opcode == sAuthorizedKeysFile ) ?
834: &options->authorized_keys_file :
835: &options->authorized_keys_file2;
836: goto parse_filename;
837:
838: case sClientAliveInterval:
839: intptr = &options->client_alive_interval;
840: goto parse_time;
841:
842: case sClientAliveCountMax:
843: intptr = &options->client_alive_count_max;
844: goto parse_int;
845:
846: case sDeprecated:
1.117 itojun 847: logit("%s line %d: Deprecated option %s",
1.94 markus 848: filename, linenum, arg);
849: while (arg)
850: arg = strdelim(&cp);
851: break;
852:
853: default:
854: fatal("%s line %d: Missing handler for opcode %s (%d)",
855: filename, linenum, arg, opcode);
856: }
857: if ((arg = strdelim(&cp)) != NULL && *arg != '\0')
858: fatal("%s line %d: garbage at end of line; \"%.200s\".",
859: filename, linenum, arg);
860: return 0;
861: }
862:
863: /* Reads the server configuration file. */
1.25 markus 864:
1.94 markus 865: void
866: read_server_config(ServerOptions *options, const char *filename)
867: {
1.112 deraadt 868: int linenum, bad_options = 0;
869: char line[1024];
1.94 markus 870: FILE *f;
1.81 stevesk 871:
1.116 markus 872: debug2("read_server_config: filename %s", filename);
1.94 markus 873: f = fopen(filename, "r");
874: if (!f) {
875: perror(filename);
876: exit(1);
877: }
878: linenum = 0;
879: while (fgets(line, sizeof(line), f)) {
880: /* Update line number counter. */
881: linenum++;
882: if (process_server_config_line(options, line, filename, linenum) != 0)
883: bad_options++;
1.1 deraadt 884: }
1.25 markus 885: fclose(f);
1.78 stevesk 886: if (bad_options > 0)
887: fatal("%s: terminating, %d bad configuration options",
888: filename, bad_options);
1.1 deraadt 889: }
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