Annotation of src/usr.bin/ssh/servconf.c, Revision 1.138
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"
1.138 ! djm 13: RCSID("$OpenBSD: servconf.c,v 1.137 2004/08/13 11:09:24 dtucker Exp $");
1.1 deraadt 14:
15: #include "ssh.h"
1.62 markus 16: #include "log.h"
1.1 deraadt 17: #include "servconf.h"
18: #include "xmalloc.h"
1.33 markus 19: #include "compat.h"
1.60 markus 20: #include "pathnames.h"
1.62 markus 21: #include "misc.h"
22: #include "cipher.h"
1.66 markus 23: #include "kex.h"
24: #include "mac.h"
1.1 deraadt 25:
1.84 itojun 26: static void add_listen_addr(ServerOptions *, char *, u_short);
27: static void add_one_listen_addr(ServerOptions *, char *, u_short);
1.29 markus 28:
1.102 provos 29: /* Use of privilege separation or not */
30: extern int use_privsep;
1.62 markus 31:
1.1 deraadt 32: /* Initializes the server options to their default values. */
33:
1.34 markus 34: void
1.25 markus 35: initialize_server_options(ServerOptions *options)
1.1 deraadt 36: {
1.25 markus 37: memset(options, 0, sizeof(*options));
1.29 markus 38: options->num_ports = 0;
39: options->ports_from_cmdline = 0;
40: options->listen_addrs = NULL;
1.138 ! djm 41: options->address_family = -1;
1.54 markus 42: options->num_host_key_files = 0;
1.36 markus 43: options->pid_file = NULL;
1.25 markus 44: options->server_key_bits = -1;
45: options->login_grace_time = -1;
46: options->key_regeneration_time = -1;
1.67 markus 47: options->permit_root_login = PERMIT_NOT_SET;
1.25 markus 48: options->ignore_rhosts = -1;
49: options->ignore_user_known_hosts = -1;
50: options->print_motd = -1;
1.72 stevesk 51: options->print_lastlog = -1;
1.25 markus 52: options->x11_forwarding = -1;
53: options->x11_display_offset = -1;
1.99 stevesk 54: options->x11_use_localhost = -1;
1.42 markus 55: options->xauth_location = NULL;
1.25 markus 56: options->strict_modes = -1;
1.129 markus 57: options->tcp_keep_alive = -1;
1.101 markus 58: options->log_facility = SYSLOG_FACILITY_NOT_SET;
59: options->log_level = SYSLOG_LEVEL_NOT_SET;
1.25 markus 60: options->rhosts_rsa_authentication = -1;
1.75 markus 61: options->hostbased_authentication = -1;
62: options->hostbased_uses_name_from_packet_only = -1;
1.25 markus 63: options->rsa_authentication = -1;
1.54 markus 64: options->pubkey_authentication = -1;
1.25 markus 65: options->kerberos_authentication = -1;
66: options->kerberos_or_local_passwd = -1;
67: options->kerberos_ticket_cleanup = -1;
1.130 jakob 68: options->kerberos_get_afs_token = -1;
1.125 markus 69: options->gss_authentication=-1;
70: options->gss_cleanup_creds = -1;
1.25 markus 71: options->password_authentication = -1;
1.52 markus 72: options->kbd_interactive_authentication = -1;
1.80 markus 73: options->challenge_response_authentication = -1;
1.25 markus 74: options->permit_empty_passwd = -1;
1.113 markus 75: options->permit_user_env = -1;
1.25 markus 76: options->use_login = -1;
1.111 markus 77: options->compression = -1;
1.53 markus 78: options->allow_tcp_forwarding = -1;
1.25 markus 79: options->num_allow_users = 0;
80: options->num_deny_users = 0;
81: options->num_allow_groups = 0;
82: options->num_deny_groups = 0;
1.33 markus 83: options->ciphers = NULL;
1.66 markus 84: options->macs = NULL;
1.33 markus 85: options->protocol = SSH_PROTO_UNKNOWN;
1.38 markus 86: options->gateway_ports = -1;
1.43 jakob 87: options->num_subsystems = 0;
1.50 markus 88: options->max_startups_begin = -1;
89: options->max_startups_rate = -1;
1.46 markus 90: options->max_startups = -1;
1.133 dtucker 91: options->max_authtries = -1;
1.57 markus 92: options->banner = NULL;
1.122 markus 93: options->use_dns = -1;
1.77 beck 94: options->client_alive_interval = -1;
95: options->client_alive_count_max = -1;
1.82 markus 96: options->authorized_keys_file = NULL;
97: options->authorized_keys_file2 = NULL;
1.131 djm 98: options->num_accept_env = 0;
1.102 provos 99:
100: /* Needs to be accessable in many places */
101: use_privsep = -1;
1.1 deraadt 102: }
103:
1.34 markus 104: void
1.25 markus 105: fill_default_server_options(ServerOptions *options)
1.1 deraadt 106: {
1.54 markus 107: if (options->protocol == SSH_PROTO_UNKNOWN)
108: options->protocol = SSH_PROTO_1|SSH_PROTO_2;
109: if (options->num_host_key_files == 0) {
110: /* fill default hostkeys for protocols */
111: if (options->protocol & SSH_PROTO_1)
1.97 stevesk 112: options->host_key_files[options->num_host_key_files++] =
113: _PATH_HOST_KEY_FILE;
114: if (options->protocol & SSH_PROTO_2) {
115: options->host_key_files[options->num_host_key_files++] =
116: _PATH_HOST_RSA_KEY_FILE;
117: options->host_key_files[options->num_host_key_files++] =
118: _PATH_HOST_DSA_KEY_FILE;
119: }
1.54 markus 120: }
1.29 markus 121: if (options->num_ports == 0)
122: options->ports[options->num_ports++] = SSH_DEFAULT_PORT;
123: if (options->listen_addrs == NULL)
1.76 stevesk 124: add_listen_addr(options, NULL, 0);
1.36 markus 125: if (options->pid_file == NULL)
1.60 markus 126: options->pid_file = _PATH_SSH_DAEMON_PID_FILE;
1.25 markus 127: if (options->server_key_bits == -1)
128: options->server_key_bits = 768;
129: if (options->login_grace_time == -1)
1.115 stevesk 130: options->login_grace_time = 120;
1.25 markus 131: if (options->key_regeneration_time == -1)
132: options->key_regeneration_time = 3600;
1.67 markus 133: if (options->permit_root_login == PERMIT_NOT_SET)
134: options->permit_root_login = PERMIT_YES;
1.25 markus 135: if (options->ignore_rhosts == -1)
1.30 markus 136: options->ignore_rhosts = 1;
1.25 markus 137: if (options->ignore_user_known_hosts == -1)
138: options->ignore_user_known_hosts = 0;
139: if (options->print_motd == -1)
140: options->print_motd = 1;
1.72 stevesk 141: if (options->print_lastlog == -1)
142: options->print_lastlog = 1;
1.25 markus 143: if (options->x11_forwarding == -1)
1.30 markus 144: options->x11_forwarding = 0;
1.25 markus 145: if (options->x11_display_offset == -1)
1.30 markus 146: options->x11_display_offset = 10;
1.99 stevesk 147: if (options->x11_use_localhost == -1)
148: options->x11_use_localhost = 1;
1.42 markus 149: if (options->xauth_location == NULL)
1.83 markus 150: options->xauth_location = _PATH_XAUTH;
1.25 markus 151: if (options->strict_modes == -1)
152: options->strict_modes = 1;
1.129 markus 153: if (options->tcp_keep_alive == -1)
154: options->tcp_keep_alive = 1;
1.101 markus 155: if (options->log_facility == SYSLOG_FACILITY_NOT_SET)
1.25 markus 156: options->log_facility = SYSLOG_FACILITY_AUTH;
1.101 markus 157: if (options->log_level == SYSLOG_LEVEL_NOT_SET)
1.58 markus 158: options->log_level = SYSLOG_LEVEL_INFO;
1.25 markus 159: if (options->rhosts_rsa_authentication == -1)
1.30 markus 160: options->rhosts_rsa_authentication = 0;
1.75 markus 161: if (options->hostbased_authentication == -1)
162: options->hostbased_authentication = 0;
163: if (options->hostbased_uses_name_from_packet_only == -1)
164: options->hostbased_uses_name_from_packet_only = 0;
1.25 markus 165: if (options->rsa_authentication == -1)
166: options->rsa_authentication = 1;
1.54 markus 167: if (options->pubkey_authentication == -1)
168: options->pubkey_authentication = 1;
1.25 markus 169: if (options->kerberos_authentication == -1)
1.107 markus 170: options->kerberos_authentication = 0;
1.25 markus 171: if (options->kerberos_or_local_passwd == -1)
172: options->kerberos_or_local_passwd = 1;
173: if (options->kerberos_ticket_cleanup == -1)
174: options->kerberos_ticket_cleanup = 1;
1.130 jakob 175: if (options->kerberos_get_afs_token == -1)
176: options->kerberos_get_afs_token = 0;
1.125 markus 177: if (options->gss_authentication == -1)
178: options->gss_authentication = 0;
179: if (options->gss_cleanup_creds == -1)
180: options->gss_cleanup_creds = 1;
1.25 markus 181: if (options->password_authentication == -1)
182: options->password_authentication = 1;
1.52 markus 183: if (options->kbd_interactive_authentication == -1)
184: options->kbd_interactive_authentication = 0;
1.80 markus 185: if (options->challenge_response_authentication == -1)
186: options->challenge_response_authentication = 1;
1.25 markus 187: if (options->permit_empty_passwd == -1)
1.30 markus 188: options->permit_empty_passwd = 0;
1.113 markus 189: if (options->permit_user_env == -1)
190: options->permit_user_env = 0;
1.25 markus 191: if (options->use_login == -1)
192: options->use_login = 0;
1.111 markus 193: if (options->compression == -1)
194: options->compression = 1;
1.53 markus 195: if (options->allow_tcp_forwarding == -1)
196: options->allow_tcp_forwarding = 1;
1.38 markus 197: if (options->gateway_ports == -1)
198: options->gateway_ports = 0;
1.46 markus 199: if (options->max_startups == -1)
200: options->max_startups = 10;
1.50 markus 201: if (options->max_startups_rate == -1)
202: options->max_startups_rate = 100; /* 100% */
203: if (options->max_startups_begin == -1)
204: options->max_startups_begin = options->max_startups;
1.133 dtucker 205: if (options->max_authtries == -1)
206: options->max_authtries = DEFAULT_AUTH_FAIL_MAX;
1.122 markus 207: if (options->use_dns == -1)
208: options->use_dns = 1;
1.77 beck 209: if (options->client_alive_interval == -1)
1.95 deraadt 210: options->client_alive_interval = 0;
1.77 beck 211: if (options->client_alive_count_max == -1)
212: options->client_alive_count_max = 3;
1.90 markus 213: if (options->authorized_keys_file2 == NULL) {
214: /* authorized_keys_file2 falls back to authorized_keys_file */
215: if (options->authorized_keys_file != NULL)
216: options->authorized_keys_file2 = options->authorized_keys_file;
217: else
218: options->authorized_keys_file2 = _PATH_SSH_USER_PERMITTED_KEYS2;
219: }
220: if (options->authorized_keys_file == NULL)
221: options->authorized_keys_file = _PATH_SSH_USER_PERMITTED_KEYS;
1.102 provos 222:
1.110 markus 223: /* Turn privilege separation on by default */
1.102 provos 224: if (use_privsep == -1)
1.110 markus 225: use_privsep = 1;
1.1 deraadt 226: }
227:
228: /* Keyword tokens. */
1.25 markus 229: typedef enum {
230: sBadOption, /* == unknown option */
231: sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime,
232: sPermitRootLogin, sLogFacility, sLogLevel,
1.124 markus 233: sRhostsRSAAuthentication, sRSAAuthentication,
1.25 markus 234: sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup,
1.130 jakob 235: sKerberosGetAFSToken,
1.123 markus 236: sKerberosTgtPassing, sChallengeResponseAuthentication,
1.138 ! djm 237: sPasswordAuthentication, sKbdInteractiveAuthentication,
! 238: sListenAddress, sAddressFamily,
1.72 stevesk 239: sPrintMotd, sPrintLastLog, sIgnoreRhosts,
1.99 stevesk 240: sX11Forwarding, sX11DisplayOffset, sX11UseLocalhost,
1.129 markus 241: sStrictModes, sEmptyPasswd, sTCPKeepAlive,
1.113 markus 242: sPermitUserEnvironment, sUseLogin, sAllowTcpForwarding, sCompression,
1.53 markus 243: sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups,
1.66 markus 244: sIgnoreUserKnownHosts, sCiphers, sMacs, sProtocol, sPidFile,
1.133 dtucker 245: sGatewayPorts, sPubkeyAuthentication, sXAuthLocation, sSubsystem,
246: sMaxStartups, sMaxAuthTries,
1.122 markus 247: sBanner, sUseDNS, sHostbasedAuthentication,
1.95 deraadt 248: sHostbasedUsesNameFromPacketOnly, sClientAliveInterval,
1.89 jakob 249: sClientAliveCountMax, sAuthorizedKeysFile, sAuthorizedKeysFile2,
1.131 djm 250: sGssAuthentication, sGssCleanupCreds, sAcceptEnv,
1.105 stevesk 251: sUsePrivilegeSeparation,
1.121 jakob 252: sDeprecated, sUnsupported
1.1 deraadt 253: } ServerOpCodes;
254:
255: /* Textual representation of the tokens. */
1.25 markus 256: static struct {
257: const char *name;
258: ServerOpCodes opcode;
259: } keywords[] = {
260: { "port", sPort },
261: { "hostkey", sHostKeyFile },
1.54 markus 262: { "hostdsakey", sHostKeyFile }, /* alias */
1.65 stevesk 263: { "pidfile", sPidFile },
1.25 markus 264: { "serverkeybits", sServerKeyBits },
265: { "logingracetime", sLoginGraceTime },
266: { "keyregenerationinterval", sKeyRegenerationTime },
267: { "permitrootlogin", sPermitRootLogin },
268: { "syslogfacility", sLogFacility },
269: { "loglevel", sLogLevel },
1.124 markus 270: { "rhostsauthentication", sDeprecated },
1.25 markus 271: { "rhostsrsaauthentication", sRhostsRSAAuthentication },
1.75 markus 272: { "hostbasedauthentication", sHostbasedAuthentication },
273: { "hostbasedusesnamefrompacketonly", sHostbasedUsesNameFromPacketOnly },
1.25 markus 274: { "rsaauthentication", sRSAAuthentication },
1.54 markus 275: { "pubkeyauthentication", sPubkeyAuthentication },
276: { "dsaauthentication", sPubkeyAuthentication }, /* alias */
1.123 markus 277: #ifdef KRB5
1.25 markus 278: { "kerberosauthentication", sKerberosAuthentication },
279: { "kerberosorlocalpasswd", sKerberosOrLocalPasswd },
280: { "kerberosticketcleanup", sKerberosTicketCleanup },
1.130 jakob 281: { "kerberosgetafstoken", sKerberosGetAFSToken },
1.121 jakob 282: #else
283: { "kerberosauthentication", sUnsupported },
284: { "kerberosorlocalpasswd", sUnsupported },
285: { "kerberosticketcleanup", sUnsupported },
1.130 jakob 286: { "kerberosgetafstoken", sUnsupported },
1.126 markus 287: #endif
1.121 jakob 288: { "kerberostgtpassing", sUnsupported },
289: { "afstokenpassing", sUnsupported },
1.125 markus 290: #ifdef GSSAPI
291: { "gssapiauthentication", sGssAuthentication },
1.128 markus 292: { "gssapicleanupcredentials", sGssCleanupCreds },
1.125 markus 293: #else
294: { "gssapiauthentication", sUnsupported },
1.128 markus 295: { "gssapicleanupcredentials", sUnsupported },
1.125 markus 296: #endif
1.25 markus 297: { "passwordauthentication", sPasswordAuthentication },
1.52 markus 298: { "kbdinteractiveauthentication", sKbdInteractiveAuthentication },
1.63 markus 299: { "challengeresponseauthentication", sChallengeResponseAuthentication },
300: { "skeyauthentication", sChallengeResponseAuthentication }, /* alias */
1.89 jakob 301: { "checkmail", sDeprecated },
1.25 markus 302: { "listenaddress", sListenAddress },
1.138 ! djm 303: { "addressfamily", sAddressFamily },
1.25 markus 304: { "printmotd", sPrintMotd },
1.72 stevesk 305: { "printlastlog", sPrintLastLog },
1.25 markus 306: { "ignorerhosts", sIgnoreRhosts },
307: { "ignoreuserknownhosts", sIgnoreUserKnownHosts },
308: { "x11forwarding", sX11Forwarding },
309: { "x11displayoffset", sX11DisplayOffset },
1.99 stevesk 310: { "x11uselocalhost", sX11UseLocalhost },
1.42 markus 311: { "xauthlocation", sXAuthLocation },
1.25 markus 312: { "strictmodes", sStrictModes },
313: { "permitemptypasswords", sEmptyPasswd },
1.113 markus 314: { "permituserenvironment", sPermitUserEnvironment },
1.25 markus 315: { "uselogin", sUseLogin },
1.111 markus 316: { "compression", sCompression },
1.129 markus 317: { "tcpkeepalive", sTCPKeepAlive },
318: { "keepalive", sTCPKeepAlive }, /* obsolete alias */
1.53 markus 319: { "allowtcpforwarding", sAllowTcpForwarding },
1.25 markus 320: { "allowusers", sAllowUsers },
321: { "denyusers", sDenyUsers },
322: { "allowgroups", sAllowGroups },
323: { "denygroups", sDenyGroups },
1.33 markus 324: { "ciphers", sCiphers },
1.66 markus 325: { "macs", sMacs },
1.33 markus 326: { "protocol", sProtocol },
1.38 markus 327: { "gatewayports", sGatewayPorts },
1.43 jakob 328: { "subsystem", sSubsystem },
1.46 markus 329: { "maxstartups", sMaxStartups },
1.133 dtucker 330: { "maxauthtries", sMaxAuthTries },
1.57 markus 331: { "banner", sBanner },
1.122 markus 332: { "usedns", sUseDNS },
333: { "verifyreversemapping", sDeprecated },
334: { "reversemappingcheck", sDeprecated },
1.77 beck 335: { "clientaliveinterval", sClientAliveInterval },
336: { "clientalivecountmax", sClientAliveCountMax },
1.82 markus 337: { "authorizedkeysfile", sAuthorizedKeysFile },
338: { "authorizedkeysfile2", sAuthorizedKeysFile2 },
1.102 provos 339: { "useprivilegeseparation", sUsePrivilegeSeparation},
1.131 djm 340: { "acceptenv", sAcceptEnv },
1.92 stevesk 341: { NULL, sBadOption }
1.1 deraadt 342: };
343:
1.27 markus 344: /*
1.73 stevesk 345: * Returns the number of the token pointed to by cp or sBadOption.
1.27 markus 346: */
1.1 deraadt 347:
1.34 markus 348: static ServerOpCodes
1.25 markus 349: parse_token(const char *cp, const char *filename,
350: int linenum)
1.1 deraadt 351: {
1.55 markus 352: u_int i;
1.1 deraadt 353:
1.25 markus 354: for (i = 0; keywords[i].name; i++)
1.28 markus 355: if (strcasecmp(cp, keywords[i].name) == 0)
1.25 markus 356: return keywords[i].opcode;
357:
1.78 stevesk 358: error("%s: line %d: Bad configuration option: %s",
359: filename, linenum, cp);
1.25 markus 360: return sBadOption;
1.1 deraadt 361: }
362:
1.84 itojun 363: static void
1.76 stevesk 364: add_listen_addr(ServerOptions *options, char *addr, u_short port)
1.74 stevesk 365: {
366: int i;
367:
368: if (options->num_ports == 0)
369: options->ports[options->num_ports++] = SSH_DEFAULT_PORT;
1.138 ! djm 370: if (options->address_family == -1)
! 371: options->address_family = AF_UNSPEC;
1.76 stevesk 372: if (port == 0)
1.74 stevesk 373: for (i = 0; i < options->num_ports; i++)
374: add_one_listen_addr(options, addr, options->ports[i]);
375: else
1.76 stevesk 376: add_one_listen_addr(options, addr, port);
1.74 stevesk 377: }
378:
1.84 itojun 379: static void
1.74 stevesk 380: add_one_listen_addr(ServerOptions *options, char *addr, u_short port)
1.29 markus 381: {
382: struct addrinfo hints, *ai, *aitop;
383: char strport[NI_MAXSERV];
384: int gaierr;
385:
1.74 stevesk 386: memset(&hints, 0, sizeof(hints));
1.138 ! djm 387: hints.ai_family = options->address_family;
1.74 stevesk 388: hints.ai_socktype = SOCK_STREAM;
389: hints.ai_flags = (addr == NULL) ? AI_PASSIVE : 0;
1.112 deraadt 390: snprintf(strport, sizeof strport, "%u", port);
1.74 stevesk 391: if ((gaierr = getaddrinfo(addr, strport, &hints, &aitop)) != 0)
392: fatal("bad addr or host: %s (%s)",
393: addr ? addr : "<NULL>",
394: gai_strerror(gaierr));
395: for (ai = aitop; ai->ai_next; ai = ai->ai_next)
396: ;
397: ai->ai_next = options->listen_addrs;
398: options->listen_addrs = aitop;
1.29 markus 399: }
400:
1.94 markus 401: int
402: process_server_config_line(ServerOptions *options, char *line,
403: const char *filename, int linenum)
1.1 deraadt 404: {
1.74 stevesk 405: char *cp, **charptr, *arg, *p;
1.112 deraadt 406: int *intptr, value, i, n;
1.25 markus 407: ServerOpCodes opcode;
408:
1.94 markus 409: cp = line;
410: arg = strdelim(&cp);
411: /* Ignore leading whitespace */
412: if (*arg == '\0')
413: arg = strdelim(&cp);
414: if (!arg || !*arg || *arg == '#')
415: return 0;
416: intptr = NULL;
417: charptr = NULL;
418: opcode = parse_token(arg, filename, linenum);
419: switch (opcode) {
420: case sBadOption:
421: return -1;
422: case sPort:
423: /* ignore ports from configfile if cmdline specifies ports */
424: if (options->ports_from_cmdline)
425: return 0;
426: if (options->listen_addrs != NULL)
427: fatal("%s line %d: ports must be specified before "
1.98 stevesk 428: "ListenAddress.", filename, linenum);
1.94 markus 429: if (options->num_ports >= MAX_PORTS)
430: fatal("%s line %d: too many ports.",
431: filename, linenum);
1.48 provos 432: arg = strdelim(&cp);
1.94 markus 433: if (!arg || *arg == '\0')
434: fatal("%s line %d: missing port number.",
435: filename, linenum);
436: options->ports[options->num_ports++] = a2port(arg);
437: if (options->ports[options->num_ports-1] == 0)
438: fatal("%s line %d: Badly formatted port number.",
439: filename, linenum);
440: break;
1.29 markus 441:
1.94 markus 442: case sServerKeyBits:
443: intptr = &options->server_key_bits;
1.25 markus 444: parse_int:
1.94 markus 445: arg = strdelim(&cp);
446: if (!arg || *arg == '\0')
447: fatal("%s line %d: missing integer value.",
448: filename, linenum);
449: value = atoi(arg);
450: if (*intptr == -1)
451: *intptr = value;
452: break;
1.25 markus 453:
1.94 markus 454: case sLoginGraceTime:
455: intptr = &options->login_grace_time;
1.81 stevesk 456: parse_time:
1.94 markus 457: arg = strdelim(&cp);
458: if (!arg || *arg == '\0')
459: fatal("%s line %d: missing time value.",
460: filename, linenum);
461: if ((value = convtime(arg)) == -1)
462: fatal("%s line %d: invalid time value.",
463: filename, linenum);
464: if (*intptr == -1)
465: *intptr = value;
466: break;
467:
468: case sKeyRegenerationTime:
469: intptr = &options->key_regeneration_time;
470: goto parse_time;
471:
472: case sListenAddress:
473: arg = strdelim(&cp);
474: if (!arg || *arg == '\0' || strncmp(arg, "[]", 2) == 0)
475: fatal("%s line %d: missing inet addr.",
476: filename, linenum);
477: if (*arg == '[') {
478: if ((p = strchr(arg, ']')) == NULL)
479: fatal("%s line %d: bad ipv6 inet addr usage.",
480: filename, linenum);
481: arg++;
482: memmove(p, p+1, strlen(p+1)+1);
483: } else if (((p = strchr(arg, ':')) == NULL) ||
484: (strchr(p+1, ':') != NULL)) {
485: add_listen_addr(options, arg, 0);
1.81 stevesk 486: break;
1.94 markus 487: }
488: if (*p == ':') {
489: u_short port;
1.25 markus 490:
1.94 markus 491: p++;
492: if (*p == '\0')
493: fatal("%s line %d: bad inet addr:port usage.",
494: filename, linenum);
495: else {
496: *(p-1) = '\0';
497: if ((port = a2port(p)) == 0)
498: fatal("%s line %d: bad port number.",
1.74 stevesk 499: filename, linenum);
1.94 markus 500: add_listen_addr(options, arg, port);
1.74 stevesk 501: }
1.94 markus 502: } else if (*p == '\0')
503: add_listen_addr(options, arg, 0);
504: else
505: fatal("%s line %d: bad inet addr usage.",
506: filename, linenum);
1.138 ! djm 507: break;
! 508:
! 509: case sAddressFamily:
! 510: arg = strdelim(&cp);
! 511: intptr = &options->address_family;
! 512: if (options->listen_addrs != NULL)
! 513: fatal("%s line %d: address family must be specified before "
! 514: "ListenAddress.", filename, linenum);
! 515: if (strcasecmp(arg, "inet") == 0)
! 516: value = AF_INET;
! 517: else if (strcasecmp(arg, "inet6") == 0)
! 518: value = AF_INET6;
! 519: else if (strcasecmp(arg, "any") == 0)
! 520: value = AF_UNSPEC;
! 521: else
! 522: fatal("%s line %d: unsupported address family \"%s\".",
! 523: filename, linenum, arg);
! 524: if (*intptr == -1)
! 525: *intptr = value;
1.94 markus 526: break;
527:
528: case sHostKeyFile:
529: intptr = &options->num_host_key_files;
530: if (*intptr >= MAX_HOSTKEYS)
531: fatal("%s line %d: too many host keys specified (max %d).",
532: filename, linenum, MAX_HOSTKEYS);
533: charptr = &options->host_key_files[*intptr];
534: parse_filename:
535: arg = strdelim(&cp);
536: if (!arg || *arg == '\0')
537: fatal("%s line %d: missing file name.",
538: filename, linenum);
539: if (*charptr == NULL) {
540: *charptr = tilde_expand_filename(arg, getuid());
541: /* increase optional counter */
542: if (intptr != NULL)
543: *intptr = *intptr + 1;
544: }
545: break;
1.76 stevesk 546:
1.94 markus 547: case sPidFile:
548: charptr = &options->pid_file;
549: goto parse_filename;
1.25 markus 550:
1.94 markus 551: case sPermitRootLogin:
552: intptr = &options->permit_root_login;
553: arg = strdelim(&cp);
554: if (!arg || *arg == '\0')
555: fatal("%s line %d: missing yes/"
556: "without-password/forced-commands-only/no "
557: "argument.", filename, linenum);
558: value = 0; /* silence compiler */
559: if (strcmp(arg, "without-password") == 0)
560: value = PERMIT_NO_PASSWD;
561: else if (strcmp(arg, "forced-commands-only") == 0)
562: value = PERMIT_FORCED_ONLY;
563: else if (strcmp(arg, "yes") == 0)
564: value = PERMIT_YES;
565: else if (strcmp(arg, "no") == 0)
566: value = PERMIT_NO;
567: else
568: fatal("%s line %d: Bad yes/"
569: "without-password/forced-commands-only/no "
570: "argument: %s", filename, linenum, arg);
571: if (*intptr == -1)
572: *intptr = value;
573: break;
1.36 markus 574:
1.94 markus 575: case sIgnoreRhosts:
576: intptr = &options->ignore_rhosts;
1.25 markus 577: parse_flag:
1.94 markus 578: arg = strdelim(&cp);
579: if (!arg || *arg == '\0')
580: fatal("%s line %d: missing yes/no argument.",
581: filename, linenum);
582: value = 0; /* silence compiler */
583: if (strcmp(arg, "yes") == 0)
584: value = 1;
585: else if (strcmp(arg, "no") == 0)
586: value = 0;
587: else
588: fatal("%s line %d: Bad yes/no argument: %s",
589: filename, linenum, arg);
590: if (*intptr == -1)
591: *intptr = value;
592: break;
593:
594: case sIgnoreUserKnownHosts:
595: intptr = &options->ignore_user_known_hosts;
596: goto parse_flag;
597:
598: case sRhostsRSAAuthentication:
599: intptr = &options->rhosts_rsa_authentication;
600: goto parse_flag;
601:
602: case sHostbasedAuthentication:
603: intptr = &options->hostbased_authentication;
604: goto parse_flag;
605:
606: case sHostbasedUsesNameFromPacketOnly:
607: intptr = &options->hostbased_uses_name_from_packet_only;
608: goto parse_flag;
609:
610: case sRSAAuthentication:
611: intptr = &options->rsa_authentication;
612: goto parse_flag;
613:
614: case sPubkeyAuthentication:
615: intptr = &options->pubkey_authentication;
616: goto parse_flag;
1.119 jakob 617:
1.94 markus 618: case sKerberosAuthentication:
619: intptr = &options->kerberos_authentication;
620: goto parse_flag;
621:
622: case sKerberosOrLocalPasswd:
623: intptr = &options->kerberos_or_local_passwd;
624: goto parse_flag;
625:
626: case sKerberosTicketCleanup:
627: intptr = &options->kerberos_ticket_cleanup;
1.130 jakob 628: goto parse_flag;
629:
630: case sKerberosGetAFSToken:
631: intptr = &options->kerberos_get_afs_token;
1.125 markus 632: goto parse_flag;
633:
634: case sGssAuthentication:
635: intptr = &options->gss_authentication;
636: goto parse_flag;
637:
638: case sGssCleanupCreds:
639: intptr = &options->gss_cleanup_creds;
1.94 markus 640: goto parse_flag;
641:
642: case sPasswordAuthentication:
643: intptr = &options->password_authentication;
644: goto parse_flag;
645:
646: case sKbdInteractiveAuthentication:
647: intptr = &options->kbd_interactive_authentication;
648: goto parse_flag;
649:
650: case sChallengeResponseAuthentication:
651: intptr = &options->challenge_response_authentication;
652: goto parse_flag;
653:
654: case sPrintMotd:
655: intptr = &options->print_motd;
656: goto parse_flag;
657:
658: case sPrintLastLog:
659: intptr = &options->print_lastlog;
660: goto parse_flag;
661:
662: case sX11Forwarding:
663: intptr = &options->x11_forwarding;
664: goto parse_flag;
665:
666: case sX11DisplayOffset:
667: intptr = &options->x11_display_offset;
668: goto parse_int;
1.99 stevesk 669:
670: case sX11UseLocalhost:
671: intptr = &options->x11_use_localhost;
672: goto parse_flag;
1.94 markus 673:
674: case sXAuthLocation:
675: charptr = &options->xauth_location;
676: goto parse_filename;
677:
678: case sStrictModes:
679: intptr = &options->strict_modes;
680: goto parse_flag;
681:
1.129 markus 682: case sTCPKeepAlive:
683: intptr = &options->tcp_keep_alive;
1.94 markus 684: goto parse_flag;
685:
686: case sEmptyPasswd:
687: intptr = &options->permit_empty_passwd;
1.113 markus 688: goto parse_flag;
689:
690: case sPermitUserEnvironment:
691: intptr = &options->permit_user_env;
1.94 markus 692: goto parse_flag;
693:
694: case sUseLogin:
695: intptr = &options->use_login;
1.111 markus 696: goto parse_flag;
697:
698: case sCompression:
699: intptr = &options->compression;
1.94 markus 700: goto parse_flag;
701:
702: case sGatewayPorts:
703: intptr = &options->gateway_ports;
704: goto parse_flag;
1.25 markus 705:
1.122 markus 706: case sUseDNS:
707: intptr = &options->use_dns;
1.94 markus 708: goto parse_flag;
1.53 markus 709:
1.94 markus 710: case sLogFacility:
711: intptr = (int *) &options->log_facility;
712: arg = strdelim(&cp);
713: value = log_facility_number(arg);
1.101 markus 714: if (value == SYSLOG_FACILITY_NOT_SET)
1.94 markus 715: fatal("%.200s line %d: unsupported log facility '%s'",
716: filename, linenum, arg ? arg : "<NONE>");
717: if (*intptr == -1)
718: *intptr = (SyslogFacility) value;
719: break;
1.25 markus 720:
1.94 markus 721: case sLogLevel:
722: intptr = (int *) &options->log_level;
723: arg = strdelim(&cp);
724: value = log_level_number(arg);
1.101 markus 725: if (value == SYSLOG_LEVEL_NOT_SET)
1.94 markus 726: fatal("%.200s line %d: unsupported log level '%s'",
727: filename, linenum, arg ? arg : "<NONE>");
728: if (*intptr == -1)
729: *intptr = (LogLevel) value;
730: break;
731:
732: case sAllowTcpForwarding:
733: intptr = &options->allow_tcp_forwarding;
734: goto parse_flag;
1.102 provos 735:
736: case sUsePrivilegeSeparation:
737: intptr = &use_privsep;
738: goto parse_flag;
1.94 markus 739:
740: case sAllowUsers:
741: while ((arg = strdelim(&cp)) && *arg != '\0') {
742: if (options->num_allow_users >= MAX_ALLOW_USERS)
743: fatal("%s line %d: too many allow users.",
744: filename, linenum);
1.112 deraadt 745: options->allow_users[options->num_allow_users++] =
746: xstrdup(arg);
1.94 markus 747: }
748: break;
1.25 markus 749:
1.94 markus 750: case sDenyUsers:
751: while ((arg = strdelim(&cp)) && *arg != '\0') {
752: if (options->num_deny_users >= MAX_DENY_USERS)
753: fatal( "%s line %d: too many deny users.",
754: filename, linenum);
1.112 deraadt 755: options->deny_users[options->num_deny_users++] =
756: xstrdup(arg);
1.94 markus 757: }
758: break;
1.25 markus 759:
1.94 markus 760: case sAllowGroups:
761: while ((arg = strdelim(&cp)) && *arg != '\0') {
762: if (options->num_allow_groups >= MAX_ALLOW_GROUPS)
763: fatal("%s line %d: too many allow groups.",
764: filename, linenum);
1.112 deraadt 765: options->allow_groups[options->num_allow_groups++] =
766: xstrdup(arg);
1.94 markus 767: }
768: break;
1.33 markus 769:
1.94 markus 770: case sDenyGroups:
771: while ((arg = strdelim(&cp)) && *arg != '\0') {
772: if (options->num_deny_groups >= MAX_DENY_GROUPS)
773: fatal("%s line %d: too many deny groups.",
774: filename, linenum);
775: options->deny_groups[options->num_deny_groups++] = xstrdup(arg);
776: }
777: break;
1.66 markus 778:
1.94 markus 779: case sCiphers:
780: arg = strdelim(&cp);
781: if (!arg || *arg == '\0')
782: fatal("%s line %d: Missing argument.", filename, linenum);
783: if (!ciphers_valid(arg))
784: fatal("%s line %d: Bad SSH2 cipher spec '%s'.",
785: filename, linenum, arg ? arg : "<NONE>");
786: if (options->ciphers == NULL)
787: options->ciphers = xstrdup(arg);
788: break;
1.33 markus 789:
1.94 markus 790: case sMacs:
791: arg = strdelim(&cp);
792: if (!arg || *arg == '\0')
793: fatal("%s line %d: Missing argument.", filename, linenum);
794: if (!mac_valid(arg))
795: fatal("%s line %d: Bad SSH2 mac spec '%s'.",
796: filename, linenum, arg ? arg : "<NONE>");
797: if (options->macs == NULL)
798: options->macs = xstrdup(arg);
799: break;
1.43 jakob 800:
1.94 markus 801: case sProtocol:
802: intptr = &options->protocol;
803: arg = strdelim(&cp);
804: if (!arg || *arg == '\0')
805: fatal("%s line %d: Missing argument.", filename, linenum);
806: value = proto_spec(arg);
807: if (value == SSH_PROTO_UNKNOWN)
808: fatal("%s line %d: Bad protocol spec '%s'.",
1.95 deraadt 809: filename, linenum, arg ? arg : "<NONE>");
1.94 markus 810: if (*intptr == SSH_PROTO_UNKNOWN)
811: *intptr = value;
812: break;
813:
814: case sSubsystem:
815: if (options->num_subsystems >= MAX_SUBSYSTEMS) {
816: fatal("%s line %d: too many subsystems defined.",
1.95 deraadt 817: filename, linenum);
1.94 markus 818: }
819: arg = strdelim(&cp);
820: if (!arg || *arg == '\0')
821: fatal("%s line %d: Missing subsystem name.",
1.95 deraadt 822: filename, linenum);
1.94 markus 823: for (i = 0; i < options->num_subsystems; i++)
824: if (strcmp(arg, options->subsystem_name[i]) == 0)
825: fatal("%s line %d: Subsystem '%s' already defined.",
1.95 deraadt 826: filename, linenum, arg);
1.94 markus 827: options->subsystem_name[options->num_subsystems] = xstrdup(arg);
828: arg = strdelim(&cp);
829: if (!arg || *arg == '\0')
830: fatal("%s line %d: Missing subsystem command.",
1.95 deraadt 831: filename, linenum);
1.94 markus 832: options->subsystem_command[options->num_subsystems] = xstrdup(arg);
833: options->num_subsystems++;
834: break;
1.46 markus 835:
1.94 markus 836: case sMaxStartups:
837: arg = strdelim(&cp);
838: if (!arg || *arg == '\0')
839: fatal("%s line %d: Missing MaxStartups spec.",
1.95 deraadt 840: filename, linenum);
1.94 markus 841: if ((n = sscanf(arg, "%d:%d:%d",
842: &options->max_startups_begin,
843: &options->max_startups_rate,
844: &options->max_startups)) == 3) {
845: if (options->max_startups_begin >
846: options->max_startups ||
847: options->max_startups_rate > 100 ||
848: options->max_startups_rate < 1)
1.50 markus 849: fatal("%s line %d: Illegal MaxStartups spec.",
1.87 stevesk 850: filename, linenum);
1.94 markus 851: } else if (n != 1)
852: fatal("%s line %d: Illegal MaxStartups spec.",
853: filename, linenum);
854: else
855: options->max_startups = options->max_startups_begin;
856: break;
1.133 dtucker 857:
858: case sMaxAuthTries:
859: intptr = &options->max_authtries;
860: goto parse_int;
1.94 markus 861:
862: case sBanner:
863: charptr = &options->banner;
864: goto parse_filename;
865: /*
866: * These options can contain %X options expanded at
867: * connect time, so that you can specify paths like:
868: *
869: * AuthorizedKeysFile /etc/ssh_keys/%u
870: */
871: case sAuthorizedKeysFile:
872: case sAuthorizedKeysFile2:
873: charptr = (opcode == sAuthorizedKeysFile ) ?
874: &options->authorized_keys_file :
875: &options->authorized_keys_file2;
876: goto parse_filename;
877:
878: case sClientAliveInterval:
879: intptr = &options->client_alive_interval;
880: goto parse_time;
881:
882: case sClientAliveCountMax:
883: intptr = &options->client_alive_count_max;
884: goto parse_int;
1.131 djm 885:
886: case sAcceptEnv:
887: while ((arg = strdelim(&cp)) && *arg != '\0') {
888: if (strchr(arg, '=') != NULL)
889: fatal("%s line %d: Invalid environment name.",
890: filename, linenum);
891: if (options->num_accept_env >= MAX_ACCEPT_ENV)
892: fatal("%s line %d: too many allow env.",
893: filename, linenum);
894: options->accept_env[options->num_accept_env++] =
895: xstrdup(arg);
896: }
897: break;
1.94 markus 898:
899: case sDeprecated:
1.117 itojun 900: logit("%s line %d: Deprecated option %s",
1.121 jakob 901: filename, linenum, arg);
902: while (arg)
903: arg = strdelim(&cp);
904: break;
905:
906: case sUnsupported:
907: logit("%s line %d: Unsupported option %s",
1.94 markus 908: filename, linenum, arg);
909: while (arg)
910: arg = strdelim(&cp);
911: break;
912:
913: default:
914: fatal("%s line %d: Missing handler for opcode %s (%d)",
915: filename, linenum, arg, opcode);
916: }
917: if ((arg = strdelim(&cp)) != NULL && *arg != '\0')
918: fatal("%s line %d: garbage at end of line; \"%.200s\".",
919: filename, linenum, arg);
920: return 0;
921: }
922:
923: /* Reads the server configuration file. */
1.25 markus 924:
1.94 markus 925: void
1.134 djm 926: load_server_config(const char *filename, Buffer *conf)
1.94 markus 927: {
1.134 djm 928: char line[1024], *cp;
1.94 markus 929: FILE *f;
1.81 stevesk 930:
1.134 djm 931: debug2("%s: filename %s", __func__, filename);
932: if ((f = fopen(filename, "r")) == NULL) {
1.94 markus 933: perror(filename);
934: exit(1);
935: }
1.134 djm 936: buffer_clear(conf);
937: while (fgets(line, sizeof(line), f)) {
938: /*
939: * Trim out comments and strip whitespace
1.135 deraadt 940: * NB - preserve newlines, they are needed to reproduce
1.134 djm 941: * line numbers later for error messages
942: */
943: if ((cp = strchr(line, '#')) != NULL)
944: memcpy(cp, "\n", 2);
945: cp = line + strspn(line, " \t\r");
946:
947: buffer_append(conf, cp, strlen(cp));
948: }
949: buffer_append(conf, "\0", 1);
950: fclose(f);
951: debug2("%s: done config len = %d", __func__, buffer_len(conf));
952: }
953:
954: void
955: parse_server_config(ServerOptions *options, const char *filename, Buffer *conf)
956: {
957: int linenum, bad_options = 0;
1.136 dtucker 958: char *cp, *obuf, *cbuf;
1.134 djm 959:
960: debug2("%s: config %s len %d", __func__, filename, buffer_len(conf));
961:
1.136 dtucker 962: obuf = cbuf = xstrdup(buffer_ptr(conf));
1.137 dtucker 963: linenum = 1;
1.134 djm 964: while((cp = strsep(&cbuf, "\n")) != NULL) {
965: if (process_server_config_line(options, cp, filename,
966: linenum++) != 0)
1.94 markus 967: bad_options++;
1.1 deraadt 968: }
1.136 dtucker 969: xfree(obuf);
1.78 stevesk 970: if (bad_options > 0)
971: fatal("%s: terminating, %d bad configuration options",
972: filename, bad_options);
1.1 deraadt 973: }
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