Annotation of src/usr.bin/ssh/servconf.c, Revision 1.135
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"
1.135 ! deraadt 13: RCSID("$OpenBSD: servconf.c,v 1.134 2004/06/24 19:30:54 djm 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:
1.62 markus 29: /* AF_UNSPEC or AF_INET or AF_INET6 */
30: extern int IPv4or6;
1.102 provos 31: /* Use of privilege separation or not */
32: extern int use_privsep;
1.62 markus 33:
1.1 deraadt 34: /* Initializes the server options to their default values. */
35:
1.34 markus 36: void
1.25 markus 37: initialize_server_options(ServerOptions *options)
1.1 deraadt 38: {
1.25 markus 39: memset(options, 0, sizeof(*options));
1.29 markus 40: options->num_ports = 0;
41: options->ports_from_cmdline = 0;
42: options->listen_addrs = NULL;
1.54 markus 43: options->num_host_key_files = 0;
1.36 markus 44: options->pid_file = NULL;
1.25 markus 45: options->server_key_bits = -1;
46: options->login_grace_time = -1;
47: options->key_regeneration_time = -1;
1.67 markus 48: options->permit_root_login = PERMIT_NOT_SET;
1.25 markus 49: options->ignore_rhosts = -1;
50: options->ignore_user_known_hosts = -1;
51: options->print_motd = -1;
1.72 stevesk 52: options->print_lastlog = -1;
1.25 markus 53: options->x11_forwarding = -1;
54: options->x11_display_offset = -1;
1.99 stevesk 55: options->x11_use_localhost = -1;
1.42 markus 56: options->xauth_location = NULL;
1.25 markus 57: options->strict_modes = -1;
1.129 markus 58: options->tcp_keep_alive = -1;
1.101 markus 59: options->log_facility = SYSLOG_FACILITY_NOT_SET;
60: options->log_level = SYSLOG_LEVEL_NOT_SET;
1.25 markus 61: options->rhosts_rsa_authentication = -1;
1.75 markus 62: options->hostbased_authentication = -1;
63: options->hostbased_uses_name_from_packet_only = -1;
1.25 markus 64: options->rsa_authentication = -1;
1.54 markus 65: options->pubkey_authentication = -1;
1.25 markus 66: options->kerberos_authentication = -1;
67: options->kerberos_or_local_passwd = -1;
68: options->kerberos_ticket_cleanup = -1;
1.130 jakob 69: options->kerberos_get_afs_token = -1;
1.125 markus 70: options->gss_authentication=-1;
71: options->gss_cleanup_creds = -1;
1.25 markus 72: options->password_authentication = -1;
1.52 markus 73: options->kbd_interactive_authentication = -1;
1.80 markus 74: options->challenge_response_authentication = -1;
1.25 markus 75: options->permit_empty_passwd = -1;
1.113 markus 76: options->permit_user_env = -1;
1.25 markus 77: options->use_login = -1;
1.111 markus 78: options->compression = -1;
1.53 markus 79: options->allow_tcp_forwarding = -1;
1.25 markus 80: options->num_allow_users = 0;
81: options->num_deny_users = 0;
82: options->num_allow_groups = 0;
83: options->num_deny_groups = 0;
1.33 markus 84: options->ciphers = NULL;
1.66 markus 85: options->macs = NULL;
1.33 markus 86: options->protocol = SSH_PROTO_UNKNOWN;
1.38 markus 87: options->gateway_ports = -1;
1.43 jakob 88: options->num_subsystems = 0;
1.50 markus 89: options->max_startups_begin = -1;
90: options->max_startups_rate = -1;
1.46 markus 91: options->max_startups = -1;
1.133 dtucker 92: options->max_authtries = -1;
1.57 markus 93: options->banner = NULL;
1.122 markus 94: options->use_dns = -1;
1.77 beck 95: options->client_alive_interval = -1;
96: options->client_alive_count_max = -1;
1.82 markus 97: options->authorized_keys_file = NULL;
98: options->authorized_keys_file2 = NULL;
1.131 djm 99: options->num_accept_env = 0;
1.102 provos 100:
101: /* Needs to be accessable in many places */
102: use_privsep = -1;
1.1 deraadt 103: }
104:
1.34 markus 105: void
1.25 markus 106: fill_default_server_options(ServerOptions *options)
1.1 deraadt 107: {
1.54 markus 108: if (options->protocol == SSH_PROTO_UNKNOWN)
109: options->protocol = SSH_PROTO_1|SSH_PROTO_2;
110: if (options->num_host_key_files == 0) {
111: /* fill default hostkeys for protocols */
112: if (options->protocol & SSH_PROTO_1)
1.97 stevesk 113: options->host_key_files[options->num_host_key_files++] =
114: _PATH_HOST_KEY_FILE;
115: if (options->protocol & SSH_PROTO_2) {
116: options->host_key_files[options->num_host_key_files++] =
117: _PATH_HOST_RSA_KEY_FILE;
118: options->host_key_files[options->num_host_key_files++] =
119: _PATH_HOST_DSA_KEY_FILE;
120: }
1.54 markus 121: }
1.29 markus 122: if (options->num_ports == 0)
123: options->ports[options->num_ports++] = SSH_DEFAULT_PORT;
124: if (options->listen_addrs == NULL)
1.76 stevesk 125: add_listen_addr(options, NULL, 0);
1.36 markus 126: if (options->pid_file == NULL)
1.60 markus 127: options->pid_file = _PATH_SSH_DAEMON_PID_FILE;
1.25 markus 128: if (options->server_key_bits == -1)
129: options->server_key_bits = 768;
130: if (options->login_grace_time == -1)
1.115 stevesk 131: options->login_grace_time = 120;
1.25 markus 132: if (options->key_regeneration_time == -1)
133: options->key_regeneration_time = 3600;
1.67 markus 134: if (options->permit_root_login == PERMIT_NOT_SET)
135: options->permit_root_login = PERMIT_YES;
1.25 markus 136: if (options->ignore_rhosts == -1)
1.30 markus 137: options->ignore_rhosts = 1;
1.25 markus 138: if (options->ignore_user_known_hosts == -1)
139: options->ignore_user_known_hosts = 0;
140: if (options->print_motd == -1)
141: options->print_motd = 1;
1.72 stevesk 142: if (options->print_lastlog == -1)
143: options->print_lastlog = 1;
1.25 markus 144: if (options->x11_forwarding == -1)
1.30 markus 145: options->x11_forwarding = 0;
1.25 markus 146: if (options->x11_display_offset == -1)
1.30 markus 147: options->x11_display_offset = 10;
1.99 stevesk 148: if (options->x11_use_localhost == -1)
149: options->x11_use_localhost = 1;
1.42 markus 150: if (options->xauth_location == NULL)
1.83 markus 151: options->xauth_location = _PATH_XAUTH;
1.25 markus 152: if (options->strict_modes == -1)
153: options->strict_modes = 1;
1.129 markus 154: if (options->tcp_keep_alive == -1)
155: options->tcp_keep_alive = 1;
1.101 markus 156: if (options->log_facility == SYSLOG_FACILITY_NOT_SET)
1.25 markus 157: options->log_facility = SYSLOG_FACILITY_AUTH;
1.101 markus 158: if (options->log_level == SYSLOG_LEVEL_NOT_SET)
1.58 markus 159: options->log_level = SYSLOG_LEVEL_INFO;
1.25 markus 160: if (options->rhosts_rsa_authentication == -1)
1.30 markus 161: options->rhosts_rsa_authentication = 0;
1.75 markus 162: if (options->hostbased_authentication == -1)
163: options->hostbased_authentication = 0;
164: if (options->hostbased_uses_name_from_packet_only == -1)
165: options->hostbased_uses_name_from_packet_only = 0;
1.25 markus 166: if (options->rsa_authentication == -1)
167: options->rsa_authentication = 1;
1.54 markus 168: if (options->pubkey_authentication == -1)
169: options->pubkey_authentication = 1;
1.25 markus 170: if (options->kerberos_authentication == -1)
1.107 markus 171: options->kerberos_authentication = 0;
1.25 markus 172: if (options->kerberos_or_local_passwd == -1)
173: options->kerberos_or_local_passwd = 1;
174: if (options->kerberos_ticket_cleanup == -1)
175: options->kerberos_ticket_cleanup = 1;
1.130 jakob 176: if (options->kerberos_get_afs_token == -1)
177: options->kerberos_get_afs_token = 0;
1.125 markus 178: if (options->gss_authentication == -1)
179: options->gss_authentication = 0;
180: if (options->gss_cleanup_creds == -1)
181: options->gss_cleanup_creds = 1;
1.25 markus 182: if (options->password_authentication == -1)
183: options->password_authentication = 1;
1.52 markus 184: if (options->kbd_interactive_authentication == -1)
185: options->kbd_interactive_authentication = 0;
1.80 markus 186: if (options->challenge_response_authentication == -1)
187: options->challenge_response_authentication = 1;
1.25 markus 188: if (options->permit_empty_passwd == -1)
1.30 markus 189: options->permit_empty_passwd = 0;
1.113 markus 190: if (options->permit_user_env == -1)
191: options->permit_user_env = 0;
1.25 markus 192: if (options->use_login == -1)
193: options->use_login = 0;
1.111 markus 194: if (options->compression == -1)
195: options->compression = 1;
1.53 markus 196: if (options->allow_tcp_forwarding == -1)
197: options->allow_tcp_forwarding = 1;
1.38 markus 198: if (options->gateway_ports == -1)
199: options->gateway_ports = 0;
1.46 markus 200: if (options->max_startups == -1)
201: options->max_startups = 10;
1.50 markus 202: if (options->max_startups_rate == -1)
203: options->max_startups_rate = 100; /* 100% */
204: if (options->max_startups_begin == -1)
205: options->max_startups_begin = options->max_startups;
1.133 dtucker 206: if (options->max_authtries == -1)
207: options->max_authtries = DEFAULT_AUTH_FAIL_MAX;
1.122 markus 208: if (options->use_dns == -1)
209: options->use_dns = 1;
1.77 beck 210: if (options->client_alive_interval == -1)
1.95 deraadt 211: options->client_alive_interval = 0;
1.77 beck 212: if (options->client_alive_count_max == -1)
213: options->client_alive_count_max = 3;
1.90 markus 214: if (options->authorized_keys_file2 == NULL) {
215: /* authorized_keys_file2 falls back to authorized_keys_file */
216: if (options->authorized_keys_file != NULL)
217: options->authorized_keys_file2 = options->authorized_keys_file;
218: else
219: options->authorized_keys_file2 = _PATH_SSH_USER_PERMITTED_KEYS2;
220: }
221: if (options->authorized_keys_file == NULL)
222: options->authorized_keys_file = _PATH_SSH_USER_PERMITTED_KEYS;
1.102 provos 223:
1.110 markus 224: /* Turn privilege separation on by default */
1.102 provos 225: if (use_privsep == -1)
1.110 markus 226: use_privsep = 1;
1.1 deraadt 227: }
228:
229: /* Keyword tokens. */
1.25 markus 230: typedef enum {
231: sBadOption, /* == unknown option */
232: sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime,
233: sPermitRootLogin, sLogFacility, sLogLevel,
1.124 markus 234: sRhostsRSAAuthentication, sRSAAuthentication,
1.25 markus 235: sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup,
1.130 jakob 236: sKerberosGetAFSToken,
1.123 markus 237: sKerberosTgtPassing, sChallengeResponseAuthentication,
1.52 markus 238: sPasswordAuthentication, sKbdInteractiveAuthentication, sListenAddress,
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 },
303: { "printmotd", sPrintMotd },
1.72 stevesk 304: { "printlastlog", sPrintLastLog },
1.25 markus 305: { "ignorerhosts", sIgnoreRhosts },
306: { "ignoreuserknownhosts", sIgnoreUserKnownHosts },
307: { "x11forwarding", sX11Forwarding },
308: { "x11displayoffset", sX11DisplayOffset },
1.99 stevesk 309: { "x11uselocalhost", sX11UseLocalhost },
1.42 markus 310: { "xauthlocation", sXAuthLocation },
1.25 markus 311: { "strictmodes", sStrictModes },
312: { "permitemptypasswords", sEmptyPasswd },
1.113 markus 313: { "permituserenvironment", sPermitUserEnvironment },
1.25 markus 314: { "uselogin", sUseLogin },
1.111 markus 315: { "compression", sCompression },
1.129 markus 316: { "tcpkeepalive", sTCPKeepAlive },
317: { "keepalive", sTCPKeepAlive }, /* obsolete alias */
1.53 markus 318: { "allowtcpforwarding", sAllowTcpForwarding },
1.25 markus 319: { "allowusers", sAllowUsers },
320: { "denyusers", sDenyUsers },
321: { "allowgroups", sAllowGroups },
322: { "denygroups", sDenyGroups },
1.33 markus 323: { "ciphers", sCiphers },
1.66 markus 324: { "macs", sMacs },
1.33 markus 325: { "protocol", sProtocol },
1.38 markus 326: { "gatewayports", sGatewayPorts },
1.43 jakob 327: { "subsystem", sSubsystem },
1.46 markus 328: { "maxstartups", sMaxStartups },
1.133 dtucker 329: { "maxauthtries", sMaxAuthTries },
1.57 markus 330: { "banner", sBanner },
1.122 markus 331: { "usedns", sUseDNS },
332: { "verifyreversemapping", sDeprecated },
333: { "reversemappingcheck", sDeprecated },
1.77 beck 334: { "clientaliveinterval", sClientAliveInterval },
335: { "clientalivecountmax", sClientAliveCountMax },
1.82 markus 336: { "authorizedkeysfile", sAuthorizedKeysFile },
337: { "authorizedkeysfile2", sAuthorizedKeysFile2 },
1.102 provos 338: { "useprivilegeseparation", sUsePrivilegeSeparation},
1.131 djm 339: { "acceptenv", sAcceptEnv },
1.92 stevesk 340: { NULL, sBadOption }
1.1 deraadt 341: };
342:
1.27 markus 343: /*
1.73 stevesk 344: * Returns the number of the token pointed to by cp or sBadOption.
1.27 markus 345: */
1.1 deraadt 346:
1.34 markus 347: static ServerOpCodes
1.25 markus 348: parse_token(const char *cp, const char *filename,
349: int linenum)
1.1 deraadt 350: {
1.55 markus 351: u_int i;
1.1 deraadt 352:
1.25 markus 353: for (i = 0; keywords[i].name; i++)
1.28 markus 354: if (strcasecmp(cp, keywords[i].name) == 0)
1.25 markus 355: return keywords[i].opcode;
356:
1.78 stevesk 357: error("%s: line %d: Bad configuration option: %s",
358: filename, linenum, cp);
1.25 markus 359: return sBadOption;
1.1 deraadt 360: }
361:
1.84 itojun 362: static void
1.76 stevesk 363: add_listen_addr(ServerOptions *options, char *addr, u_short port)
1.74 stevesk 364: {
365: int i;
366:
367: if (options->num_ports == 0)
368: options->ports[options->num_ports++] = SSH_DEFAULT_PORT;
1.76 stevesk 369: if (port == 0)
1.74 stevesk 370: for (i = 0; i < options->num_ports; i++)
371: add_one_listen_addr(options, addr, options->ports[i]);
372: else
1.76 stevesk 373: add_one_listen_addr(options, addr, port);
1.74 stevesk 374: }
375:
1.84 itojun 376: static void
1.74 stevesk 377: add_one_listen_addr(ServerOptions *options, char *addr, u_short port)
1.29 markus 378: {
379: struct addrinfo hints, *ai, *aitop;
380: char strport[NI_MAXSERV];
381: int gaierr;
382:
1.74 stevesk 383: memset(&hints, 0, sizeof(hints));
384: hints.ai_family = IPv4or6;
385: hints.ai_socktype = SOCK_STREAM;
386: hints.ai_flags = (addr == NULL) ? AI_PASSIVE : 0;
1.112 deraadt 387: snprintf(strport, sizeof strport, "%u", port);
1.74 stevesk 388: if ((gaierr = getaddrinfo(addr, strport, &hints, &aitop)) != 0)
389: fatal("bad addr or host: %s (%s)",
390: addr ? addr : "<NULL>",
391: gai_strerror(gaierr));
392: for (ai = aitop; ai->ai_next; ai = ai->ai_next)
393: ;
394: ai->ai_next = options->listen_addrs;
395: options->listen_addrs = aitop;
1.29 markus 396: }
397:
1.94 markus 398: int
399: process_server_config_line(ServerOptions *options, char *line,
400: const char *filename, int linenum)
1.1 deraadt 401: {
1.74 stevesk 402: char *cp, **charptr, *arg, *p;
1.112 deraadt 403: int *intptr, value, i, n;
1.25 markus 404: ServerOpCodes opcode;
405:
1.94 markus 406: cp = line;
407: arg = strdelim(&cp);
408: /* Ignore leading whitespace */
409: if (*arg == '\0')
410: arg = strdelim(&cp);
411: if (!arg || !*arg || *arg == '#')
412: return 0;
413: intptr = NULL;
414: charptr = NULL;
415: opcode = parse_token(arg, filename, linenum);
416: switch (opcode) {
417: case sBadOption:
418: return -1;
419: case sPort:
420: /* ignore ports from configfile if cmdline specifies ports */
421: if (options->ports_from_cmdline)
422: return 0;
423: if (options->listen_addrs != NULL)
424: fatal("%s line %d: ports must be specified before "
1.98 stevesk 425: "ListenAddress.", filename, linenum);
1.94 markus 426: if (options->num_ports >= MAX_PORTS)
427: fatal("%s line %d: too many ports.",
428: filename, linenum);
1.48 provos 429: arg = strdelim(&cp);
1.94 markus 430: if (!arg || *arg == '\0')
431: fatal("%s line %d: missing port number.",
432: filename, linenum);
433: options->ports[options->num_ports++] = a2port(arg);
434: if (options->ports[options->num_ports-1] == 0)
435: fatal("%s line %d: Badly formatted port number.",
436: filename, linenum);
437: break;
1.29 markus 438:
1.94 markus 439: case sServerKeyBits:
440: intptr = &options->server_key_bits;
1.25 markus 441: parse_int:
1.94 markus 442: arg = strdelim(&cp);
443: if (!arg || *arg == '\0')
444: fatal("%s line %d: missing integer value.",
445: filename, linenum);
446: value = atoi(arg);
447: if (*intptr == -1)
448: *intptr = value;
449: break;
1.25 markus 450:
1.94 markus 451: case sLoginGraceTime:
452: intptr = &options->login_grace_time;
1.81 stevesk 453: parse_time:
1.94 markus 454: arg = strdelim(&cp);
455: if (!arg || *arg == '\0')
456: fatal("%s line %d: missing time value.",
457: filename, linenum);
458: if ((value = convtime(arg)) == -1)
459: fatal("%s line %d: invalid time value.",
460: filename, linenum);
461: if (*intptr == -1)
462: *intptr = value;
463: break;
464:
465: case sKeyRegenerationTime:
466: intptr = &options->key_regeneration_time;
467: goto parse_time;
468:
469: case sListenAddress:
470: arg = strdelim(&cp);
471: if (!arg || *arg == '\0' || strncmp(arg, "[]", 2) == 0)
472: fatal("%s line %d: missing inet addr.",
473: filename, linenum);
474: if (*arg == '[') {
475: if ((p = strchr(arg, ']')) == NULL)
476: fatal("%s line %d: bad ipv6 inet addr usage.",
477: filename, linenum);
478: arg++;
479: memmove(p, p+1, strlen(p+1)+1);
480: } else if (((p = strchr(arg, ':')) == NULL) ||
481: (strchr(p+1, ':') != NULL)) {
482: add_listen_addr(options, arg, 0);
1.81 stevesk 483: break;
1.94 markus 484: }
485: if (*p == ':') {
486: u_short port;
1.25 markus 487:
1.94 markus 488: p++;
489: if (*p == '\0')
490: fatal("%s line %d: bad inet addr:port usage.",
491: filename, linenum);
492: else {
493: *(p-1) = '\0';
494: if ((port = a2port(p)) == 0)
495: fatal("%s line %d: bad port number.",
1.74 stevesk 496: filename, linenum);
1.94 markus 497: add_listen_addr(options, arg, port);
1.74 stevesk 498: }
1.94 markus 499: } else if (*p == '\0')
500: add_listen_addr(options, arg, 0);
501: else
502: fatal("%s line %d: bad inet addr usage.",
503: filename, linenum);
504: break;
505:
506: case sHostKeyFile:
507: intptr = &options->num_host_key_files;
508: if (*intptr >= MAX_HOSTKEYS)
509: fatal("%s line %d: too many host keys specified (max %d).",
510: filename, linenum, MAX_HOSTKEYS);
511: charptr = &options->host_key_files[*intptr];
512: parse_filename:
513: arg = strdelim(&cp);
514: if (!arg || *arg == '\0')
515: fatal("%s line %d: missing file name.",
516: filename, linenum);
517: if (*charptr == NULL) {
518: *charptr = tilde_expand_filename(arg, getuid());
519: /* increase optional counter */
520: if (intptr != NULL)
521: *intptr = *intptr + 1;
522: }
523: break;
1.76 stevesk 524:
1.94 markus 525: case sPidFile:
526: charptr = &options->pid_file;
527: goto parse_filename;
1.25 markus 528:
1.94 markus 529: case sPermitRootLogin:
530: intptr = &options->permit_root_login;
531: arg = strdelim(&cp);
532: if (!arg || *arg == '\0')
533: fatal("%s line %d: missing yes/"
534: "without-password/forced-commands-only/no "
535: "argument.", filename, linenum);
536: value = 0; /* silence compiler */
537: if (strcmp(arg, "without-password") == 0)
538: value = PERMIT_NO_PASSWD;
539: else if (strcmp(arg, "forced-commands-only") == 0)
540: value = PERMIT_FORCED_ONLY;
541: else if (strcmp(arg, "yes") == 0)
542: value = PERMIT_YES;
543: else if (strcmp(arg, "no") == 0)
544: value = PERMIT_NO;
545: else
546: fatal("%s line %d: Bad yes/"
547: "without-password/forced-commands-only/no "
548: "argument: %s", filename, linenum, arg);
549: if (*intptr == -1)
550: *intptr = value;
551: break;
1.36 markus 552:
1.94 markus 553: case sIgnoreRhosts:
554: intptr = &options->ignore_rhosts;
1.25 markus 555: parse_flag:
1.94 markus 556: arg = strdelim(&cp);
557: if (!arg || *arg == '\0')
558: fatal("%s line %d: missing yes/no argument.",
559: filename, linenum);
560: value = 0; /* silence compiler */
561: if (strcmp(arg, "yes") == 0)
562: value = 1;
563: else if (strcmp(arg, "no") == 0)
564: value = 0;
565: else
566: fatal("%s line %d: Bad yes/no argument: %s",
567: filename, linenum, arg);
568: if (*intptr == -1)
569: *intptr = value;
570: break;
571:
572: case sIgnoreUserKnownHosts:
573: intptr = &options->ignore_user_known_hosts;
574: goto parse_flag;
575:
576: case sRhostsRSAAuthentication:
577: intptr = &options->rhosts_rsa_authentication;
578: goto parse_flag;
579:
580: case sHostbasedAuthentication:
581: intptr = &options->hostbased_authentication;
582: goto parse_flag;
583:
584: case sHostbasedUsesNameFromPacketOnly:
585: intptr = &options->hostbased_uses_name_from_packet_only;
586: goto parse_flag;
587:
588: case sRSAAuthentication:
589: intptr = &options->rsa_authentication;
590: goto parse_flag;
591:
592: case sPubkeyAuthentication:
593: intptr = &options->pubkey_authentication;
594: goto parse_flag;
1.119 jakob 595:
1.94 markus 596: case sKerberosAuthentication:
597: intptr = &options->kerberos_authentication;
598: goto parse_flag;
599:
600: case sKerberosOrLocalPasswd:
601: intptr = &options->kerberos_or_local_passwd;
602: goto parse_flag;
603:
604: case sKerberosTicketCleanup:
605: intptr = &options->kerberos_ticket_cleanup;
1.130 jakob 606: goto parse_flag;
607:
608: case sKerberosGetAFSToken:
609: intptr = &options->kerberos_get_afs_token;
1.125 markus 610: goto parse_flag;
611:
612: case sGssAuthentication:
613: intptr = &options->gss_authentication;
614: goto parse_flag;
615:
616: case sGssCleanupCreds:
617: intptr = &options->gss_cleanup_creds;
1.94 markus 618: goto parse_flag;
619:
620: case sPasswordAuthentication:
621: intptr = &options->password_authentication;
622: goto parse_flag;
623:
624: case sKbdInteractiveAuthentication:
625: intptr = &options->kbd_interactive_authentication;
626: goto parse_flag;
627:
628: case sChallengeResponseAuthentication:
629: intptr = &options->challenge_response_authentication;
630: goto parse_flag;
631:
632: case sPrintMotd:
633: intptr = &options->print_motd;
634: goto parse_flag;
635:
636: case sPrintLastLog:
637: intptr = &options->print_lastlog;
638: goto parse_flag;
639:
640: case sX11Forwarding:
641: intptr = &options->x11_forwarding;
642: goto parse_flag;
643:
644: case sX11DisplayOffset:
645: intptr = &options->x11_display_offset;
646: goto parse_int;
1.99 stevesk 647:
648: case sX11UseLocalhost:
649: intptr = &options->x11_use_localhost;
650: goto parse_flag;
1.94 markus 651:
652: case sXAuthLocation:
653: charptr = &options->xauth_location;
654: goto parse_filename;
655:
656: case sStrictModes:
657: intptr = &options->strict_modes;
658: goto parse_flag;
659:
1.129 markus 660: case sTCPKeepAlive:
661: intptr = &options->tcp_keep_alive;
1.94 markus 662: goto parse_flag;
663:
664: case sEmptyPasswd:
665: intptr = &options->permit_empty_passwd;
1.113 markus 666: goto parse_flag;
667:
668: case sPermitUserEnvironment:
669: intptr = &options->permit_user_env;
1.94 markus 670: goto parse_flag;
671:
672: case sUseLogin:
673: intptr = &options->use_login;
1.111 markus 674: goto parse_flag;
675:
676: case sCompression:
677: intptr = &options->compression;
1.94 markus 678: goto parse_flag;
679:
680: case sGatewayPorts:
681: intptr = &options->gateway_ports;
682: goto parse_flag;
1.25 markus 683:
1.122 markus 684: case sUseDNS:
685: intptr = &options->use_dns;
1.94 markus 686: goto parse_flag;
1.53 markus 687:
1.94 markus 688: case sLogFacility:
689: intptr = (int *) &options->log_facility;
690: arg = strdelim(&cp);
691: value = log_facility_number(arg);
1.101 markus 692: if (value == SYSLOG_FACILITY_NOT_SET)
1.94 markus 693: fatal("%.200s line %d: unsupported log facility '%s'",
694: filename, linenum, arg ? arg : "<NONE>");
695: if (*intptr == -1)
696: *intptr = (SyslogFacility) value;
697: break;
1.25 markus 698:
1.94 markus 699: case sLogLevel:
700: intptr = (int *) &options->log_level;
701: arg = strdelim(&cp);
702: value = log_level_number(arg);
1.101 markus 703: if (value == SYSLOG_LEVEL_NOT_SET)
1.94 markus 704: fatal("%.200s line %d: unsupported log level '%s'",
705: filename, linenum, arg ? arg : "<NONE>");
706: if (*intptr == -1)
707: *intptr = (LogLevel) value;
708: break;
709:
710: case sAllowTcpForwarding:
711: intptr = &options->allow_tcp_forwarding;
712: goto parse_flag;
1.102 provos 713:
714: case sUsePrivilegeSeparation:
715: intptr = &use_privsep;
716: goto parse_flag;
1.94 markus 717:
718: case sAllowUsers:
719: while ((arg = strdelim(&cp)) && *arg != '\0') {
720: if (options->num_allow_users >= MAX_ALLOW_USERS)
721: fatal("%s line %d: too many allow users.",
722: filename, linenum);
1.112 deraadt 723: options->allow_users[options->num_allow_users++] =
724: xstrdup(arg);
1.94 markus 725: }
726: break;
1.25 markus 727:
1.94 markus 728: case sDenyUsers:
729: while ((arg = strdelim(&cp)) && *arg != '\0') {
730: if (options->num_deny_users >= MAX_DENY_USERS)
731: fatal( "%s line %d: too many deny users.",
732: filename, linenum);
1.112 deraadt 733: options->deny_users[options->num_deny_users++] =
734: xstrdup(arg);
1.94 markus 735: }
736: break;
1.25 markus 737:
1.94 markus 738: case sAllowGroups:
739: while ((arg = strdelim(&cp)) && *arg != '\0') {
740: if (options->num_allow_groups >= MAX_ALLOW_GROUPS)
741: fatal("%s line %d: too many allow groups.",
742: filename, linenum);
1.112 deraadt 743: options->allow_groups[options->num_allow_groups++] =
744: xstrdup(arg);
1.94 markus 745: }
746: break;
1.33 markus 747:
1.94 markus 748: case sDenyGroups:
749: while ((arg = strdelim(&cp)) && *arg != '\0') {
750: if (options->num_deny_groups >= MAX_DENY_GROUPS)
751: fatal("%s line %d: too many deny groups.",
752: filename, linenum);
753: options->deny_groups[options->num_deny_groups++] = xstrdup(arg);
754: }
755: break;
1.66 markus 756:
1.94 markus 757: case sCiphers:
758: arg = strdelim(&cp);
759: if (!arg || *arg == '\0')
760: fatal("%s line %d: Missing argument.", filename, linenum);
761: if (!ciphers_valid(arg))
762: fatal("%s line %d: Bad SSH2 cipher spec '%s'.",
763: filename, linenum, arg ? arg : "<NONE>");
764: if (options->ciphers == NULL)
765: options->ciphers = xstrdup(arg);
766: break;
1.33 markus 767:
1.94 markus 768: case sMacs:
769: arg = strdelim(&cp);
770: if (!arg || *arg == '\0')
771: fatal("%s line %d: Missing argument.", filename, linenum);
772: if (!mac_valid(arg))
773: fatal("%s line %d: Bad SSH2 mac spec '%s'.",
774: filename, linenum, arg ? arg : "<NONE>");
775: if (options->macs == NULL)
776: options->macs = xstrdup(arg);
777: break;
1.43 jakob 778:
1.94 markus 779: case sProtocol:
780: intptr = &options->protocol;
781: arg = strdelim(&cp);
782: if (!arg || *arg == '\0')
783: fatal("%s line %d: Missing argument.", filename, linenum);
784: value = proto_spec(arg);
785: if (value == SSH_PROTO_UNKNOWN)
786: fatal("%s line %d: Bad protocol spec '%s'.",
1.95 deraadt 787: filename, linenum, arg ? arg : "<NONE>");
1.94 markus 788: if (*intptr == SSH_PROTO_UNKNOWN)
789: *intptr = value;
790: break;
791:
792: case sSubsystem:
793: if (options->num_subsystems >= MAX_SUBSYSTEMS) {
794: fatal("%s line %d: too many subsystems defined.",
1.95 deraadt 795: filename, linenum);
1.94 markus 796: }
797: arg = strdelim(&cp);
798: if (!arg || *arg == '\0')
799: fatal("%s line %d: Missing subsystem name.",
1.95 deraadt 800: filename, linenum);
1.94 markus 801: for (i = 0; i < options->num_subsystems; i++)
802: if (strcmp(arg, options->subsystem_name[i]) == 0)
803: fatal("%s line %d: Subsystem '%s' already defined.",
1.95 deraadt 804: filename, linenum, arg);
1.94 markus 805: options->subsystem_name[options->num_subsystems] = xstrdup(arg);
806: arg = strdelim(&cp);
807: if (!arg || *arg == '\0')
808: fatal("%s line %d: Missing subsystem command.",
1.95 deraadt 809: filename, linenum);
1.94 markus 810: options->subsystem_command[options->num_subsystems] = xstrdup(arg);
811: options->num_subsystems++;
812: break;
1.46 markus 813:
1.94 markus 814: case sMaxStartups:
815: arg = strdelim(&cp);
816: if (!arg || *arg == '\0')
817: fatal("%s line %d: Missing MaxStartups spec.",
1.95 deraadt 818: filename, linenum);
1.94 markus 819: if ((n = sscanf(arg, "%d:%d:%d",
820: &options->max_startups_begin,
821: &options->max_startups_rate,
822: &options->max_startups)) == 3) {
823: if (options->max_startups_begin >
824: options->max_startups ||
825: options->max_startups_rate > 100 ||
826: options->max_startups_rate < 1)
1.50 markus 827: fatal("%s line %d: Illegal MaxStartups spec.",
1.87 stevesk 828: filename, linenum);
1.94 markus 829: } else if (n != 1)
830: fatal("%s line %d: Illegal MaxStartups spec.",
831: filename, linenum);
832: else
833: options->max_startups = options->max_startups_begin;
834: break;
1.133 dtucker 835:
836: case sMaxAuthTries:
837: intptr = &options->max_authtries;
838: goto parse_int;
1.94 markus 839:
840: case sBanner:
841: charptr = &options->banner;
842: goto parse_filename;
843: /*
844: * These options can contain %X options expanded at
845: * connect time, so that you can specify paths like:
846: *
847: * AuthorizedKeysFile /etc/ssh_keys/%u
848: */
849: case sAuthorizedKeysFile:
850: case sAuthorizedKeysFile2:
851: charptr = (opcode == sAuthorizedKeysFile ) ?
852: &options->authorized_keys_file :
853: &options->authorized_keys_file2;
854: goto parse_filename;
855:
856: case sClientAliveInterval:
857: intptr = &options->client_alive_interval;
858: goto parse_time;
859:
860: case sClientAliveCountMax:
861: intptr = &options->client_alive_count_max;
862: goto parse_int;
1.131 djm 863:
864: case sAcceptEnv:
865: while ((arg = strdelim(&cp)) && *arg != '\0') {
866: if (strchr(arg, '=') != NULL)
867: fatal("%s line %d: Invalid environment name.",
868: filename, linenum);
869: if (options->num_accept_env >= MAX_ACCEPT_ENV)
870: fatal("%s line %d: too many allow env.",
871: filename, linenum);
872: options->accept_env[options->num_accept_env++] =
873: xstrdup(arg);
874: }
875: break;
1.94 markus 876:
877: case sDeprecated:
1.117 itojun 878: logit("%s line %d: Deprecated option %s",
1.121 jakob 879: filename, linenum, arg);
880: while (arg)
881: arg = strdelim(&cp);
882: break;
883:
884: case sUnsupported:
885: logit("%s line %d: Unsupported option %s",
1.94 markus 886: filename, linenum, arg);
887: while (arg)
888: arg = strdelim(&cp);
889: break;
890:
891: default:
892: fatal("%s line %d: Missing handler for opcode %s (%d)",
893: filename, linenum, arg, opcode);
894: }
895: if ((arg = strdelim(&cp)) != NULL && *arg != '\0')
896: fatal("%s line %d: garbage at end of line; \"%.200s\".",
897: filename, linenum, arg);
898: return 0;
899: }
900:
901: /* Reads the server configuration file. */
1.25 markus 902:
1.94 markus 903: void
1.134 djm 904: load_server_config(const char *filename, Buffer *conf)
1.94 markus 905: {
1.134 djm 906: char line[1024], *cp;
1.94 markus 907: FILE *f;
1.81 stevesk 908:
1.134 djm 909: debug2("%s: filename %s", __func__, filename);
910: if ((f = fopen(filename, "r")) == NULL) {
1.94 markus 911: perror(filename);
912: exit(1);
913: }
1.134 djm 914: buffer_clear(conf);
915: while (fgets(line, sizeof(line), f)) {
916: /*
917: * Trim out comments and strip whitespace
1.135 ! deraadt 918: * NB - preserve newlines, they are needed to reproduce
1.134 djm 919: * line numbers later for error messages
920: */
921: if ((cp = strchr(line, '#')) != NULL)
922: memcpy(cp, "\n", 2);
923: cp = line + strspn(line, " \t\r");
924:
925: buffer_append(conf, cp, strlen(cp));
926: }
927: buffer_append(conf, "\0", 1);
928: fclose(f);
929: debug2("%s: done config len = %d", __func__, buffer_len(conf));
930: }
931:
932: void
933: parse_server_config(ServerOptions *options, const char *filename, Buffer *conf)
934: {
935: int linenum, bad_options = 0;
936: char *cp, *cbuf;
937:
938: debug2("%s: config %s len %d", __func__, filename, buffer_len(conf));
939:
940: cbuf = xstrdup(buffer_ptr(conf));
1.94 markus 941: linenum = 0;
1.134 djm 942: while((cp = strsep(&cbuf, "\n")) != NULL) {
943: if (process_server_config_line(options, cp, filename,
944: linenum++) != 0)
1.94 markus 945: bad_options++;
1.1 deraadt 946: }
1.134 djm 947: free(cbuf);
1.78 stevesk 948: if (bad_options > 0)
949: fatal("%s: terminating, %d bad configuration options",
950: filename, bad_options);
1.1 deraadt 951: }
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