Annotation of src/usr.bin/ssh/servconf.c, Revision 1.173
1.173 ! dtucker 1: /* $OpenBSD: servconf.c,v 1.172 2007/04/23 10:15:39 dtucker Exp $ */
1.1 deraadt 2: /*
1.26 deraadt 3: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4: * All rights reserved
1.34 markus 5: *
1.51 deraadt 6: * As far as I am concerned, the code I have written for this software
7: * can be used freely for any purpose. Any derived versions of this
8: * software must be clearly marked as such, and if the derived work is
9: * incompatible with the protocol description in the RFC file, it must be
10: * called by a name other than "ssh" or "Secure Shell".
1.26 deraadt 11: */
1.1 deraadt 12:
1.152 stevesk 13: #include <sys/types.h>
14: #include <sys/socket.h>
1.154 stevesk 15:
16: #include <netdb.h>
1.165 dtucker 17: #include <pwd.h>
1.162 stevesk 18: #include <stdio.h>
1.161 stevesk 19: #include <stdlib.h>
1.160 stevesk 20: #include <string.h>
1.164 deraadt 21: #include <signal.h>
1.155 stevesk 22: #include <unistd.h>
1.164 deraadt 23: #include <stdarg.h>
1.1 deraadt 24:
1.164 deraadt 25: #include "xmalloc.h"
1.1 deraadt 26: #include "ssh.h"
1.62 markus 27: #include "log.h"
1.164 deraadt 28: #include "buffer.h"
1.1 deraadt 29: #include "servconf.h"
1.33 markus 30: #include "compat.h"
1.60 markus 31: #include "pathnames.h"
1.62 markus 32: #include "misc.h"
33: #include "cipher.h"
1.164 deraadt 34: #include "key.h"
1.66 markus 35: #include "kex.h"
36: #include "mac.h"
1.153 dtucker 37: #include "match.h"
1.156 dtucker 38: #include "channels.h"
1.165 dtucker 39: #include "groupaccess.h"
1.1 deraadt 40:
1.84 itojun 41: static void add_listen_addr(ServerOptions *, char *, u_short);
42: static void add_one_listen_addr(ServerOptions *, char *, u_short);
1.29 markus 43:
1.102 provos 44: /* Use of privilege separation or not */
45: extern int use_privsep;
1.153 dtucker 46: extern Buffer cfg;
1.62 markus 47:
1.1 deraadt 48: /* Initializes the server options to their default values. */
49:
1.34 markus 50: void
1.25 markus 51: initialize_server_options(ServerOptions *options)
1.1 deraadt 52: {
1.25 markus 53: memset(options, 0, sizeof(*options));
1.29 markus 54: options->num_ports = 0;
55: options->ports_from_cmdline = 0;
56: options->listen_addrs = NULL;
1.138 djm 57: options->address_family = -1;
1.54 markus 58: options->num_host_key_files = 0;
1.36 markus 59: options->pid_file = NULL;
1.25 markus 60: options->server_key_bits = -1;
61: options->login_grace_time = -1;
62: options->key_regeneration_time = -1;
1.67 markus 63: options->permit_root_login = PERMIT_NOT_SET;
1.25 markus 64: options->ignore_rhosts = -1;
65: options->ignore_user_known_hosts = -1;
66: options->print_motd = -1;
1.72 stevesk 67: options->print_lastlog = -1;
1.25 markus 68: options->x11_forwarding = -1;
69: options->x11_display_offset = -1;
1.99 stevesk 70: options->x11_use_localhost = -1;
1.42 markus 71: options->xauth_location = NULL;
1.25 markus 72: options->strict_modes = -1;
1.129 markus 73: options->tcp_keep_alive = -1;
1.101 markus 74: options->log_facility = SYSLOG_FACILITY_NOT_SET;
75: options->log_level = SYSLOG_LEVEL_NOT_SET;
1.25 markus 76: options->rhosts_rsa_authentication = -1;
1.75 markus 77: options->hostbased_authentication = -1;
78: options->hostbased_uses_name_from_packet_only = -1;
1.25 markus 79: options->rsa_authentication = -1;
1.54 markus 80: options->pubkey_authentication = -1;
1.25 markus 81: options->kerberos_authentication = -1;
82: options->kerberos_or_local_passwd = -1;
83: options->kerberos_ticket_cleanup = -1;
1.130 jakob 84: options->kerberos_get_afs_token = -1;
1.125 markus 85: options->gss_authentication=-1;
86: options->gss_cleanup_creds = -1;
1.25 markus 87: options->password_authentication = -1;
1.52 markus 88: options->kbd_interactive_authentication = -1;
1.80 markus 89: options->challenge_response_authentication = -1;
1.25 markus 90: options->permit_empty_passwd = -1;
1.113 markus 91: options->permit_user_env = -1;
1.25 markus 92: options->use_login = -1;
1.111 markus 93: options->compression = -1;
1.53 markus 94: options->allow_tcp_forwarding = -1;
1.25 markus 95: options->num_allow_users = 0;
96: options->num_deny_users = 0;
97: options->num_allow_groups = 0;
98: options->num_deny_groups = 0;
1.33 markus 99: options->ciphers = NULL;
1.66 markus 100: options->macs = NULL;
1.33 markus 101: options->protocol = SSH_PROTO_UNKNOWN;
1.38 markus 102: options->gateway_ports = -1;
1.43 jakob 103: options->num_subsystems = 0;
1.50 markus 104: options->max_startups_begin = -1;
105: options->max_startups_rate = -1;
1.46 markus 106: options->max_startups = -1;
1.133 dtucker 107: options->max_authtries = -1;
1.57 markus 108: options->banner = NULL;
1.122 markus 109: options->use_dns = -1;
1.77 beck 110: options->client_alive_interval = -1;
111: options->client_alive_count_max = -1;
1.82 markus 112: options->authorized_keys_file = NULL;
113: options->authorized_keys_file2 = NULL;
1.131 djm 114: options->num_accept_env = 0;
1.145 reyk 115: options->permit_tun = -1;
1.159 dtucker 116: options->num_permitted_opens = -1;
1.158 dtucker 117: options->adm_forced_command = NULL;
1.1 deraadt 118: }
119:
1.34 markus 120: void
1.25 markus 121: fill_default_server_options(ServerOptions *options)
1.1 deraadt 122: {
1.54 markus 123: if (options->protocol == SSH_PROTO_UNKNOWN)
124: options->protocol = SSH_PROTO_1|SSH_PROTO_2;
125: if (options->num_host_key_files == 0) {
126: /* fill default hostkeys for protocols */
127: if (options->protocol & SSH_PROTO_1)
1.97 stevesk 128: options->host_key_files[options->num_host_key_files++] =
129: _PATH_HOST_KEY_FILE;
130: if (options->protocol & SSH_PROTO_2) {
131: options->host_key_files[options->num_host_key_files++] =
132: _PATH_HOST_RSA_KEY_FILE;
133: options->host_key_files[options->num_host_key_files++] =
134: _PATH_HOST_DSA_KEY_FILE;
135: }
1.54 markus 136: }
1.29 markus 137: if (options->num_ports == 0)
138: options->ports[options->num_ports++] = SSH_DEFAULT_PORT;
139: if (options->listen_addrs == NULL)
1.76 stevesk 140: add_listen_addr(options, NULL, 0);
1.36 markus 141: if (options->pid_file == NULL)
1.60 markus 142: options->pid_file = _PATH_SSH_DAEMON_PID_FILE;
1.25 markus 143: if (options->server_key_bits == -1)
144: options->server_key_bits = 768;
145: if (options->login_grace_time == -1)
1.115 stevesk 146: options->login_grace_time = 120;
1.25 markus 147: if (options->key_regeneration_time == -1)
148: options->key_regeneration_time = 3600;
1.67 markus 149: if (options->permit_root_login == PERMIT_NOT_SET)
150: options->permit_root_login = PERMIT_YES;
1.25 markus 151: if (options->ignore_rhosts == -1)
1.30 markus 152: options->ignore_rhosts = 1;
1.25 markus 153: if (options->ignore_user_known_hosts == -1)
154: options->ignore_user_known_hosts = 0;
155: if (options->print_motd == -1)
156: options->print_motd = 1;
1.72 stevesk 157: if (options->print_lastlog == -1)
158: options->print_lastlog = 1;
1.25 markus 159: if (options->x11_forwarding == -1)
1.30 markus 160: options->x11_forwarding = 0;
1.25 markus 161: if (options->x11_display_offset == -1)
1.30 markus 162: options->x11_display_offset = 10;
1.99 stevesk 163: if (options->x11_use_localhost == -1)
164: options->x11_use_localhost = 1;
1.42 markus 165: if (options->xauth_location == NULL)
1.83 markus 166: options->xauth_location = _PATH_XAUTH;
1.25 markus 167: if (options->strict_modes == -1)
168: options->strict_modes = 1;
1.129 markus 169: if (options->tcp_keep_alive == -1)
170: options->tcp_keep_alive = 1;
1.101 markus 171: if (options->log_facility == SYSLOG_FACILITY_NOT_SET)
1.25 markus 172: options->log_facility = SYSLOG_FACILITY_AUTH;
1.101 markus 173: if (options->log_level == SYSLOG_LEVEL_NOT_SET)
1.58 markus 174: options->log_level = SYSLOG_LEVEL_INFO;
1.25 markus 175: if (options->rhosts_rsa_authentication == -1)
1.30 markus 176: options->rhosts_rsa_authentication = 0;
1.75 markus 177: if (options->hostbased_authentication == -1)
178: options->hostbased_authentication = 0;
179: if (options->hostbased_uses_name_from_packet_only == -1)
180: options->hostbased_uses_name_from_packet_only = 0;
1.25 markus 181: if (options->rsa_authentication == -1)
182: options->rsa_authentication = 1;
1.54 markus 183: if (options->pubkey_authentication == -1)
184: options->pubkey_authentication = 1;
1.25 markus 185: if (options->kerberos_authentication == -1)
1.107 markus 186: options->kerberos_authentication = 0;
1.25 markus 187: if (options->kerberos_or_local_passwd == -1)
188: options->kerberos_or_local_passwd = 1;
189: if (options->kerberos_ticket_cleanup == -1)
190: options->kerberos_ticket_cleanup = 1;
1.130 jakob 191: if (options->kerberos_get_afs_token == -1)
192: options->kerberos_get_afs_token = 0;
1.125 markus 193: if (options->gss_authentication == -1)
194: options->gss_authentication = 0;
195: if (options->gss_cleanup_creds == -1)
196: options->gss_cleanup_creds = 1;
1.25 markus 197: if (options->password_authentication == -1)
198: options->password_authentication = 1;
1.52 markus 199: if (options->kbd_interactive_authentication == -1)
200: options->kbd_interactive_authentication = 0;
1.80 markus 201: if (options->challenge_response_authentication == -1)
202: options->challenge_response_authentication = 1;
1.25 markus 203: if (options->permit_empty_passwd == -1)
1.30 markus 204: options->permit_empty_passwd = 0;
1.113 markus 205: if (options->permit_user_env == -1)
206: options->permit_user_env = 0;
1.25 markus 207: if (options->use_login == -1)
208: options->use_login = 0;
1.111 markus 209: if (options->compression == -1)
1.143 markus 210: options->compression = COMP_DELAYED;
1.53 markus 211: if (options->allow_tcp_forwarding == -1)
212: options->allow_tcp_forwarding = 1;
1.38 markus 213: if (options->gateway_ports == -1)
214: options->gateway_ports = 0;
1.46 markus 215: if (options->max_startups == -1)
216: options->max_startups = 10;
1.50 markus 217: if (options->max_startups_rate == -1)
218: options->max_startups_rate = 100; /* 100% */
219: if (options->max_startups_begin == -1)
220: options->max_startups_begin = options->max_startups;
1.133 dtucker 221: if (options->max_authtries == -1)
222: options->max_authtries = DEFAULT_AUTH_FAIL_MAX;
1.122 markus 223: if (options->use_dns == -1)
224: options->use_dns = 1;
1.77 beck 225: if (options->client_alive_interval == -1)
1.95 deraadt 226: options->client_alive_interval = 0;
1.77 beck 227: if (options->client_alive_count_max == -1)
228: options->client_alive_count_max = 3;
1.90 markus 229: if (options->authorized_keys_file2 == NULL) {
230: /* authorized_keys_file2 falls back to authorized_keys_file */
231: if (options->authorized_keys_file != NULL)
232: options->authorized_keys_file2 = options->authorized_keys_file;
233: else
234: options->authorized_keys_file2 = _PATH_SSH_USER_PERMITTED_KEYS2;
235: }
236: if (options->authorized_keys_file == NULL)
237: options->authorized_keys_file = _PATH_SSH_USER_PERMITTED_KEYS;
1.145 reyk 238: if (options->permit_tun == -1)
1.146 reyk 239: options->permit_tun = SSH_TUNMODE_NO;
1.102 provos 240:
1.110 markus 241: /* Turn privilege separation on by default */
1.102 provos 242: if (use_privsep == -1)
1.110 markus 243: use_privsep = 1;
1.1 deraadt 244: }
245:
246: /* Keyword tokens. */
1.25 markus 247: typedef enum {
248: sBadOption, /* == unknown option */
249: sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime,
250: sPermitRootLogin, sLogFacility, sLogLevel,
1.124 markus 251: sRhostsRSAAuthentication, sRSAAuthentication,
1.25 markus 252: sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup,
1.130 jakob 253: sKerberosGetAFSToken,
1.123 markus 254: sKerberosTgtPassing, sChallengeResponseAuthentication,
1.138 djm 255: sPasswordAuthentication, sKbdInteractiveAuthentication,
256: sListenAddress, sAddressFamily,
1.72 stevesk 257: sPrintMotd, sPrintLastLog, sIgnoreRhosts,
1.99 stevesk 258: sX11Forwarding, sX11DisplayOffset, sX11UseLocalhost,
1.129 markus 259: sStrictModes, sEmptyPasswd, sTCPKeepAlive,
1.113 markus 260: sPermitUserEnvironment, sUseLogin, sAllowTcpForwarding, sCompression,
1.53 markus 261: sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups,
1.66 markus 262: sIgnoreUserKnownHosts, sCiphers, sMacs, sProtocol, sPidFile,
1.133 dtucker 263: sGatewayPorts, sPubkeyAuthentication, sXAuthLocation, sSubsystem,
264: sMaxStartups, sMaxAuthTries,
1.122 markus 265: sBanner, sUseDNS, sHostbasedAuthentication,
1.95 deraadt 266: sHostbasedUsesNameFromPacketOnly, sClientAliveInterval,
1.89 jakob 267: sClientAliveCountMax, sAuthorizedKeysFile, sAuthorizedKeysFile2,
1.145 reyk 268: sGssAuthentication, sGssCleanupCreds, sAcceptEnv, sPermitTunnel,
1.158 dtucker 269: sMatch, sPermitOpen, sForceCommand,
1.105 stevesk 270: sUsePrivilegeSeparation,
1.121 jakob 271: sDeprecated, sUnsupported
1.1 deraadt 272: } ServerOpCodes;
273:
1.153 dtucker 274: #define SSHCFG_GLOBAL 0x01 /* allowed in main section of sshd_config */
275: #define SSHCFG_MATCH 0x02 /* allowed inside a Match section */
276: #define SSHCFG_ALL (SSHCFG_GLOBAL|SSHCFG_MATCH)
277:
1.1 deraadt 278: /* Textual representation of the tokens. */
1.25 markus 279: static struct {
280: const char *name;
281: ServerOpCodes opcode;
1.153 dtucker 282: u_int flags;
1.25 markus 283: } keywords[] = {
1.153 dtucker 284: { "port", sPort, SSHCFG_GLOBAL },
285: { "hostkey", sHostKeyFile, SSHCFG_GLOBAL },
286: { "hostdsakey", sHostKeyFile, SSHCFG_GLOBAL }, /* alias */
287: { "pidfile", sPidFile, SSHCFG_GLOBAL },
288: { "serverkeybits", sServerKeyBits, SSHCFG_GLOBAL },
289: { "logingracetime", sLoginGraceTime, SSHCFG_GLOBAL },
290: { "keyregenerationinterval", sKeyRegenerationTime, SSHCFG_GLOBAL },
291: { "permitrootlogin", sPermitRootLogin, SSHCFG_GLOBAL },
292: { "syslogfacility", sLogFacility, SSHCFG_GLOBAL },
293: { "loglevel", sLogLevel, SSHCFG_GLOBAL },
294: { "rhostsauthentication", sDeprecated, SSHCFG_GLOBAL },
1.168 dtucker 295: { "rhostsrsaauthentication", sRhostsRSAAuthentication, SSHCFG_ALL },
296: { "hostbasedauthentication", sHostbasedAuthentication, SSHCFG_ALL },
1.153 dtucker 297: { "hostbasedusesnamefrompacketonly", sHostbasedUsesNameFromPacketOnly, SSHCFG_GLOBAL },
1.168 dtucker 298: { "rsaauthentication", sRSAAuthentication, SSHCFG_ALL },
299: { "pubkeyauthentication", sPubkeyAuthentication, SSHCFG_ALL },
1.153 dtucker 300: { "dsaauthentication", sPubkeyAuthentication, SSHCFG_GLOBAL }, /* alias */
1.123 markus 301: #ifdef KRB5
1.168 dtucker 302: { "kerberosauthentication", sKerberosAuthentication, SSHCFG_ALL },
1.153 dtucker 303: { "kerberosorlocalpasswd", sKerberosOrLocalPasswd, SSHCFG_GLOBAL },
304: { "kerberosticketcleanup", sKerberosTicketCleanup, SSHCFG_GLOBAL },
305: { "kerberosgetafstoken", sKerberosGetAFSToken, SSHCFG_GLOBAL },
1.121 jakob 306: #else
1.168 dtucker 307: { "kerberosauthentication", sUnsupported, SSHCFG_ALL },
1.153 dtucker 308: { "kerberosorlocalpasswd", sUnsupported, SSHCFG_GLOBAL },
309: { "kerberosticketcleanup", sUnsupported, SSHCFG_GLOBAL },
310: { "kerberosgetafstoken", sUnsupported, SSHCFG_GLOBAL },
1.126 markus 311: #endif
1.153 dtucker 312: { "kerberostgtpassing", sUnsupported, SSHCFG_GLOBAL },
313: { "afstokenpassing", sUnsupported, SSHCFG_GLOBAL },
1.125 markus 314: #ifdef GSSAPI
1.168 dtucker 315: { "gssapiauthentication", sGssAuthentication, SSHCFG_ALL },
1.153 dtucker 316: { "gssapicleanupcredentials", sGssCleanupCreds, SSHCFG_GLOBAL },
1.125 markus 317: #else
1.168 dtucker 318: { "gssapiauthentication", sUnsupported, SSHCFG_ALL },
1.153 dtucker 319: { "gssapicleanupcredentials", sUnsupported, SSHCFG_GLOBAL },
1.125 markus 320: #endif
1.168 dtucker 321: { "passwordauthentication", sPasswordAuthentication, SSHCFG_ALL },
322: { "kbdinteractiveauthentication", sKbdInteractiveAuthentication, SSHCFG_ALL },
1.170 dtucker 323: { "challengeresponseauthentication", sChallengeResponseAuthentication, SSHCFG_GLOBAL },
1.153 dtucker 324: { "skeyauthentication", sChallengeResponseAuthentication, SSHCFG_GLOBAL }, /* alias */
325: { "checkmail", sDeprecated, SSHCFG_GLOBAL },
326: { "listenaddress", sListenAddress, SSHCFG_GLOBAL },
327: { "addressfamily", sAddressFamily, SSHCFG_GLOBAL },
328: { "printmotd", sPrintMotd, SSHCFG_GLOBAL },
329: { "printlastlog", sPrintLastLog, SSHCFG_GLOBAL },
330: { "ignorerhosts", sIgnoreRhosts, SSHCFG_GLOBAL },
331: { "ignoreuserknownhosts", sIgnoreUserKnownHosts, SSHCFG_GLOBAL },
1.157 dtucker 332: { "x11forwarding", sX11Forwarding, SSHCFG_ALL },
333: { "x11displayoffset", sX11DisplayOffset, SSHCFG_ALL },
334: { "x11uselocalhost", sX11UseLocalhost, SSHCFG_ALL },
1.153 dtucker 335: { "xauthlocation", sXAuthLocation, SSHCFG_GLOBAL },
336: { "strictmodes", sStrictModes, SSHCFG_GLOBAL },
337: { "permitemptypasswords", sEmptyPasswd, SSHCFG_GLOBAL },
338: { "permituserenvironment", sPermitUserEnvironment, SSHCFG_GLOBAL },
339: { "uselogin", sUseLogin, SSHCFG_GLOBAL },
340: { "compression", sCompression, SSHCFG_GLOBAL },
341: { "tcpkeepalive", sTCPKeepAlive, SSHCFG_GLOBAL },
342: { "keepalive", sTCPKeepAlive, SSHCFG_GLOBAL }, /* obsolete alias */
343: { "allowtcpforwarding", sAllowTcpForwarding, SSHCFG_ALL },
344: { "allowusers", sAllowUsers, SSHCFG_GLOBAL },
345: { "denyusers", sDenyUsers, SSHCFG_GLOBAL },
346: { "allowgroups", sAllowGroups, SSHCFG_GLOBAL },
347: { "denygroups", sDenyGroups, SSHCFG_GLOBAL },
348: { "ciphers", sCiphers, SSHCFG_GLOBAL },
349: { "macs", sMacs, SSHCFG_GLOBAL },
350: { "protocol", sProtocol, SSHCFG_GLOBAL },
351: { "gatewayports", sGatewayPorts, SSHCFG_ALL },
352: { "subsystem", sSubsystem, SSHCFG_GLOBAL },
353: { "maxstartups", sMaxStartups, SSHCFG_GLOBAL },
354: { "maxauthtries", sMaxAuthTries, SSHCFG_GLOBAL },
1.168 dtucker 355: { "banner", sBanner, SSHCFG_ALL },
1.153 dtucker 356: { "usedns", sUseDNS, SSHCFG_GLOBAL },
357: { "verifyreversemapping", sDeprecated, SSHCFG_GLOBAL },
358: { "reversemappingcheck", sDeprecated, SSHCFG_GLOBAL },
359: { "clientaliveinterval", sClientAliveInterval, SSHCFG_GLOBAL },
360: { "clientalivecountmax", sClientAliveCountMax, SSHCFG_GLOBAL },
361: { "authorizedkeysfile", sAuthorizedKeysFile, SSHCFG_GLOBAL },
362: { "authorizedkeysfile2", sAuthorizedKeysFile2, SSHCFG_GLOBAL },
363: { "useprivilegeseparation", sUsePrivilegeSeparation, SSHCFG_GLOBAL},
364: { "acceptenv", sAcceptEnv, SSHCFG_GLOBAL },
365: { "permittunnel", sPermitTunnel, SSHCFG_GLOBAL },
366: { "match", sMatch, SSHCFG_ALL },
1.156 dtucker 367: { "permitopen", sPermitOpen, SSHCFG_ALL },
1.158 dtucker 368: { "forcecommand", sForceCommand, SSHCFG_ALL },
1.153 dtucker 369: { NULL, sBadOption, 0 }
1.1 deraadt 370: };
371:
1.27 markus 372: /*
1.73 stevesk 373: * Returns the number of the token pointed to by cp or sBadOption.
1.27 markus 374: */
1.1 deraadt 375:
1.34 markus 376: static ServerOpCodes
1.25 markus 377: parse_token(const char *cp, const char *filename,
1.153 dtucker 378: int linenum, u_int *flags)
1.1 deraadt 379: {
1.55 markus 380: u_int i;
1.1 deraadt 381:
1.25 markus 382: for (i = 0; keywords[i].name; i++)
1.153 dtucker 383: if (strcasecmp(cp, keywords[i].name) == 0) {
384: *flags = keywords[i].flags;
1.25 markus 385: return keywords[i].opcode;
1.153 dtucker 386: }
1.25 markus 387:
1.78 stevesk 388: error("%s: line %d: Bad configuration option: %s",
389: filename, linenum, cp);
1.25 markus 390: return sBadOption;
1.1 deraadt 391: }
392:
1.84 itojun 393: static void
1.76 stevesk 394: add_listen_addr(ServerOptions *options, char *addr, u_short port)
1.74 stevesk 395: {
1.142 djm 396: u_int i;
1.74 stevesk 397:
398: if (options->num_ports == 0)
399: options->ports[options->num_ports++] = SSH_DEFAULT_PORT;
1.138 djm 400: if (options->address_family == -1)
401: options->address_family = AF_UNSPEC;
1.76 stevesk 402: if (port == 0)
1.74 stevesk 403: for (i = 0; i < options->num_ports; i++)
404: add_one_listen_addr(options, addr, options->ports[i]);
405: else
1.76 stevesk 406: add_one_listen_addr(options, addr, port);
1.74 stevesk 407: }
408:
1.84 itojun 409: static void
1.74 stevesk 410: add_one_listen_addr(ServerOptions *options, char *addr, u_short port)
1.29 markus 411: {
412: struct addrinfo hints, *ai, *aitop;
413: char strport[NI_MAXSERV];
414: int gaierr;
415:
1.74 stevesk 416: memset(&hints, 0, sizeof(hints));
1.138 djm 417: hints.ai_family = options->address_family;
1.74 stevesk 418: hints.ai_socktype = SOCK_STREAM;
419: hints.ai_flags = (addr == NULL) ? AI_PASSIVE : 0;
1.112 deraadt 420: snprintf(strport, sizeof strport, "%u", port);
1.74 stevesk 421: if ((gaierr = getaddrinfo(addr, strport, &hints, &aitop)) != 0)
422: fatal("bad addr or host: %s (%s)",
423: addr ? addr : "<NULL>",
1.173 ! dtucker 424: ssh_gai_strerror(gaierr));
1.74 stevesk 425: for (ai = aitop; ai->ai_next; ai = ai->ai_next)
426: ;
427: ai->ai_next = options->listen_addrs;
428: options->listen_addrs = aitop;
1.29 markus 429: }
430:
1.153 dtucker 431: /*
432: * The strategy for the Match blocks is that the config file is parsed twice.
433: *
434: * The first time is at startup. activep is initialized to 1 and the
435: * directives in the global context are processed and acted on. Hitting a
436: * Match directive unsets activep and the directives inside the block are
437: * checked for syntax only.
438: *
439: * The second time is after a connection has been established but before
440: * authentication. activep is initialized to 2 and global config directives
441: * are ignored since they have already been processed. If the criteria in a
442: * Match block is met, activep is set and the subsequent directives
443: * processed and actioned until EOF or another Match block unsets it. Any
444: * options set are copied into the main server config.
445: *
446: * Potential additions/improvements:
447: * - Add Match support for pre-kex directives, eg Protocol, Ciphers.
448: *
449: * - Add a Tag directive (idea from David Leonard) ala pf, eg:
450: * Match Address 192.168.0.*
451: * Tag trusted
452: * Match Group wheel
453: * Tag trusted
454: * Match Tag trusted
455: * AllowTcpForwarding yes
456: * GatewayPorts clientspecified
457: * [...]
458: *
459: * - Add a PermittedChannelRequests directive
460: * Match Group shell
461: * PermittedChannelRequests session,forwarded-tcpip
462: */
463:
464: static int
1.165 dtucker 465: match_cfg_line_group(const char *grps, int line, const char *user)
466: {
467: int result = 0;
468: u_int ngrps = 0;
469: char *arg, *p, *cp, *grplist[MAX_MATCH_GROUPS];
470: struct passwd *pw;
471:
472: /*
473: * Even if we do not have a user yet, we still need to check for
474: * valid syntax.
475: */
476: arg = cp = xstrdup(grps);
477: while ((p = strsep(&cp, ",")) != NULL && *p != '\0') {
478: if (ngrps >= MAX_MATCH_GROUPS) {
479: error("line %d: too many groups in Match Group", line);
480: result = -1;
481: goto out;
482: }
483: grplist[ngrps++] = p;
484: }
485:
486: if (user == NULL)
487: goto out;
488:
489: if ((pw = getpwnam(user)) == NULL) {
490: debug("Can't match group at line %d because user %.100s does "
491: "not exist", line, user);
492: } else if (ga_init(pw->pw_name, pw->pw_gid) == 0) {
493: debug("Can't Match group because user %.100s not in any group "
494: "at line %d", user, line);
495: } else if (ga_match(grplist, ngrps) != 1) {
496: debug("user %.100s does not match group %.100s at line %d",
497: user, arg, line);
498: } else {
499: debug("user %.100s matched group %.100s at line %d", user,
500: arg, line);
501: result = 1;
502: }
503: out:
504: ga_free();
505: xfree(arg);
506: return result;
507: }
508:
509: static int
1.153 dtucker 510: match_cfg_line(char **condition, int line, const char *user, const char *host,
511: const char *address)
512: {
513: int result = 1;
514: char *arg, *attrib, *cp = *condition;
515: size_t len;
516:
517: if (user == NULL)
518: debug3("checking syntax for 'Match %s'", cp);
519: else
520: debug3("checking match for '%s' user %s host %s addr %s", cp,
521: user ? user : "(null)", host ? host : "(null)",
522: address ? address : "(null)");
523:
524: while ((attrib = strdelim(&cp)) && *attrib != '\0') {
525: if ((arg = strdelim(&cp)) == NULL || *arg == '\0') {
526: error("Missing Match criteria for %s", attrib);
527: return -1;
528: }
529: len = strlen(arg);
530: if (strcasecmp(attrib, "user") == 0) {
531: if (!user) {
532: result = 0;
533: continue;
534: }
535: if (match_pattern_list(user, arg, len, 0) != 1)
536: result = 0;
537: else
538: debug("user %.100s matched 'User %.100s' at "
539: "line %d", user, arg, line);
1.165 dtucker 540: } else if (strcasecmp(attrib, "group") == 0) {
541: switch (match_cfg_line_group(arg, line, user)) {
542: case -1:
543: return -1;
544: case 0:
545: result = 0;
546: }
1.153 dtucker 547: } else if (strcasecmp(attrib, "host") == 0) {
548: if (!host) {
549: result = 0;
550: continue;
551: }
552: if (match_hostname(host, arg, len) != 1)
553: result = 0;
554: else
555: debug("connection from %.100s matched 'Host "
556: "%.100s' at line %d", host, arg, line);
557: } else if (strcasecmp(attrib, "address") == 0) {
558: if (!address) {
559: result = 0;
560: continue;
561: }
562: if (match_hostname(address, arg, len) != 1)
563: result = 0;
564: else
565: debug("connection from %.100s matched 'Address "
566: "%.100s' at line %d", address, arg, line);
567: } else {
568: error("Unsupported Match attribute %s", attrib);
569: return -1;
570: }
571: }
572: if (user != NULL)
573: debug3("match %sfound", result ? "" : "not ");
574: *condition = cp;
575: return result;
576: }
577:
1.158 dtucker 578: #define WHITESPACE " \t\r\n"
579:
1.94 markus 580: int
581: process_server_config_line(ServerOptions *options, char *line,
1.153 dtucker 582: const char *filename, int linenum, int *activep, const char *user,
583: const char *host, const char *address)
1.1 deraadt 584: {
1.74 stevesk 585: char *cp, **charptr, *arg, *p;
1.153 dtucker 586: int cmdline = 0, *intptr, value, n;
1.25 markus 587: ServerOpCodes opcode;
1.139 djm 588: u_short port;
1.153 dtucker 589: u_int i, flags = 0;
1.151 djm 590: size_t len;
1.25 markus 591:
1.94 markus 592: cp = line;
1.148 dtucker 593: if ((arg = strdelim(&cp)) == NULL)
1.147 djm 594: return 0;
1.94 markus 595: /* Ignore leading whitespace */
596: if (*arg == '\0')
597: arg = strdelim(&cp);
598: if (!arg || !*arg || *arg == '#')
599: return 0;
600: intptr = NULL;
601: charptr = NULL;
1.153 dtucker 602: opcode = parse_token(arg, filename, linenum, &flags);
603:
604: if (activep == NULL) { /* We are processing a command line directive */
605: cmdline = 1;
606: activep = &cmdline;
607: }
608: if (*activep && opcode != sMatch)
609: debug3("%s:%d setting %s %s", filename, linenum, arg, cp);
610: if (*activep == 0 && !(flags & SSHCFG_MATCH)) {
611: if (user == NULL) {
612: fatal("%s line %d: Directive '%s' is not allowed "
613: "within a Match block", filename, linenum, arg);
614: } else { /* this is a directive we have already processed */
615: while (arg)
616: arg = strdelim(&cp);
617: return 0;
618: }
619: }
620:
1.94 markus 621: switch (opcode) {
622: case sBadOption:
623: return -1;
624: case sPort:
625: /* ignore ports from configfile if cmdline specifies ports */
626: if (options->ports_from_cmdline)
627: return 0;
628: if (options->listen_addrs != NULL)
629: fatal("%s line %d: ports must be specified before "
1.98 stevesk 630: "ListenAddress.", filename, linenum);
1.94 markus 631: if (options->num_ports >= MAX_PORTS)
632: fatal("%s line %d: too many ports.",
633: filename, linenum);
1.48 provos 634: arg = strdelim(&cp);
1.94 markus 635: if (!arg || *arg == '\0')
636: fatal("%s line %d: missing port number.",
637: filename, linenum);
638: options->ports[options->num_ports++] = a2port(arg);
639: if (options->ports[options->num_ports-1] == 0)
640: fatal("%s line %d: Badly formatted port number.",
641: filename, linenum);
642: break;
1.29 markus 643:
1.94 markus 644: case sServerKeyBits:
645: intptr = &options->server_key_bits;
1.25 markus 646: parse_int:
1.94 markus 647: arg = strdelim(&cp);
648: if (!arg || *arg == '\0')
649: fatal("%s line %d: missing integer value.",
650: filename, linenum);
651: value = atoi(arg);
1.153 dtucker 652: if (*activep && *intptr == -1)
1.94 markus 653: *intptr = value;
654: break;
1.25 markus 655:
1.94 markus 656: case sLoginGraceTime:
657: intptr = &options->login_grace_time;
1.81 stevesk 658: parse_time:
1.94 markus 659: arg = strdelim(&cp);
660: if (!arg || *arg == '\0')
661: fatal("%s line %d: missing time value.",
662: filename, linenum);
663: if ((value = convtime(arg)) == -1)
664: fatal("%s line %d: invalid time value.",
665: filename, linenum);
666: if (*intptr == -1)
667: *intptr = value;
668: break;
669:
670: case sKeyRegenerationTime:
671: intptr = &options->key_regeneration_time;
672: goto parse_time;
673:
674: case sListenAddress:
675: arg = strdelim(&cp);
1.139 djm 676: if (arg == NULL || *arg == '\0')
677: fatal("%s line %d: missing address",
1.94 markus 678: filename, linenum);
1.144 dtucker 679: /* check for bare IPv6 address: no "[]" and 2 or more ":" */
680: if (strchr(arg, '[') == NULL && (p = strchr(arg, ':')) != NULL
681: && strchr(p+1, ':') != NULL) {
682: add_listen_addr(options, arg, 0);
683: break;
684: }
1.139 djm 685: p = hpdelim(&arg);
686: if (p == NULL)
687: fatal("%s line %d: bad address:port usage",
688: filename, linenum);
689: p = cleanhostname(p);
690: if (arg == NULL)
691: port = 0;
692: else if ((port = a2port(arg)) == 0)
693: fatal("%s line %d: bad port number", filename, linenum);
694:
695: add_listen_addr(options, p, port);
1.25 markus 696:
1.138 djm 697: break;
698:
699: case sAddressFamily:
700: arg = strdelim(&cp);
1.141 markus 701: if (!arg || *arg == '\0')
702: fatal("%s line %d: missing address family.",
703: filename, linenum);
1.138 djm 704: intptr = &options->address_family;
705: if (options->listen_addrs != NULL)
706: fatal("%s line %d: address family must be specified before "
707: "ListenAddress.", filename, linenum);
708: if (strcasecmp(arg, "inet") == 0)
709: value = AF_INET;
710: else if (strcasecmp(arg, "inet6") == 0)
711: value = AF_INET6;
712: else if (strcasecmp(arg, "any") == 0)
713: value = AF_UNSPEC;
714: else
715: fatal("%s line %d: unsupported address family \"%s\".",
716: filename, linenum, arg);
717: if (*intptr == -1)
718: *intptr = value;
1.94 markus 719: break;
720:
721: case sHostKeyFile:
722: intptr = &options->num_host_key_files;
723: if (*intptr >= MAX_HOSTKEYS)
724: fatal("%s line %d: too many host keys specified (max %d).",
725: filename, linenum, MAX_HOSTKEYS);
726: charptr = &options->host_key_files[*intptr];
727: parse_filename:
728: arg = strdelim(&cp);
729: if (!arg || *arg == '\0')
730: fatal("%s line %d: missing file name.",
731: filename, linenum);
1.153 dtucker 732: if (*activep && *charptr == NULL) {
1.94 markus 733: *charptr = tilde_expand_filename(arg, getuid());
734: /* increase optional counter */
735: if (intptr != NULL)
736: *intptr = *intptr + 1;
737: }
738: break;
1.76 stevesk 739:
1.94 markus 740: case sPidFile:
741: charptr = &options->pid_file;
742: goto parse_filename;
1.25 markus 743:
1.94 markus 744: case sPermitRootLogin:
745: intptr = &options->permit_root_login;
746: arg = strdelim(&cp);
747: if (!arg || *arg == '\0')
748: fatal("%s line %d: missing yes/"
749: "without-password/forced-commands-only/no "
750: "argument.", filename, linenum);
751: value = 0; /* silence compiler */
752: if (strcmp(arg, "without-password") == 0)
753: value = PERMIT_NO_PASSWD;
754: else if (strcmp(arg, "forced-commands-only") == 0)
755: value = PERMIT_FORCED_ONLY;
756: else if (strcmp(arg, "yes") == 0)
757: value = PERMIT_YES;
758: else if (strcmp(arg, "no") == 0)
759: value = PERMIT_NO;
760: else
761: fatal("%s line %d: Bad yes/"
762: "without-password/forced-commands-only/no "
763: "argument: %s", filename, linenum, arg);
764: if (*intptr == -1)
765: *intptr = value;
766: break;
1.36 markus 767:
1.94 markus 768: case sIgnoreRhosts:
769: intptr = &options->ignore_rhosts;
1.25 markus 770: parse_flag:
1.94 markus 771: arg = strdelim(&cp);
772: if (!arg || *arg == '\0')
773: fatal("%s line %d: missing yes/no argument.",
774: filename, linenum);
775: value = 0; /* silence compiler */
776: if (strcmp(arg, "yes") == 0)
777: value = 1;
778: else if (strcmp(arg, "no") == 0)
779: value = 0;
780: else
781: fatal("%s line %d: Bad yes/no argument: %s",
782: filename, linenum, arg);
1.153 dtucker 783: if (*activep && *intptr == -1)
1.94 markus 784: *intptr = value;
785: break;
786:
787: case sIgnoreUserKnownHosts:
788: intptr = &options->ignore_user_known_hosts;
789: goto parse_flag;
790:
791: case sRhostsRSAAuthentication:
792: intptr = &options->rhosts_rsa_authentication;
793: goto parse_flag;
794:
795: case sHostbasedAuthentication:
796: intptr = &options->hostbased_authentication;
797: goto parse_flag;
798:
799: case sHostbasedUsesNameFromPacketOnly:
800: intptr = &options->hostbased_uses_name_from_packet_only;
801: goto parse_flag;
802:
803: case sRSAAuthentication:
804: intptr = &options->rsa_authentication;
805: goto parse_flag;
806:
807: case sPubkeyAuthentication:
808: intptr = &options->pubkey_authentication;
809: goto parse_flag;
1.119 jakob 810:
1.94 markus 811: case sKerberosAuthentication:
812: intptr = &options->kerberos_authentication;
813: goto parse_flag;
814:
815: case sKerberosOrLocalPasswd:
816: intptr = &options->kerberos_or_local_passwd;
817: goto parse_flag;
818:
819: case sKerberosTicketCleanup:
820: intptr = &options->kerberos_ticket_cleanup;
1.130 jakob 821: goto parse_flag;
822:
823: case sKerberosGetAFSToken:
824: intptr = &options->kerberos_get_afs_token;
1.125 markus 825: goto parse_flag;
826:
827: case sGssAuthentication:
828: intptr = &options->gss_authentication;
829: goto parse_flag;
830:
831: case sGssCleanupCreds:
832: intptr = &options->gss_cleanup_creds;
1.94 markus 833: goto parse_flag;
834:
835: case sPasswordAuthentication:
836: intptr = &options->password_authentication;
837: goto parse_flag;
838:
839: case sKbdInteractiveAuthentication:
840: intptr = &options->kbd_interactive_authentication;
841: goto parse_flag;
842:
843: case sChallengeResponseAuthentication:
844: intptr = &options->challenge_response_authentication;
845: goto parse_flag;
846:
847: case sPrintMotd:
848: intptr = &options->print_motd;
849: goto parse_flag;
850:
851: case sPrintLastLog:
852: intptr = &options->print_lastlog;
853: goto parse_flag;
854:
855: case sX11Forwarding:
856: intptr = &options->x11_forwarding;
857: goto parse_flag;
858:
859: case sX11DisplayOffset:
860: intptr = &options->x11_display_offset;
861: goto parse_int;
1.99 stevesk 862:
863: case sX11UseLocalhost:
864: intptr = &options->x11_use_localhost;
865: goto parse_flag;
1.94 markus 866:
867: case sXAuthLocation:
868: charptr = &options->xauth_location;
869: goto parse_filename;
870:
871: case sStrictModes:
872: intptr = &options->strict_modes;
873: goto parse_flag;
874:
1.129 markus 875: case sTCPKeepAlive:
876: intptr = &options->tcp_keep_alive;
1.94 markus 877: goto parse_flag;
878:
879: case sEmptyPasswd:
880: intptr = &options->permit_empty_passwd;
1.113 markus 881: goto parse_flag;
882:
883: case sPermitUserEnvironment:
884: intptr = &options->permit_user_env;
1.94 markus 885: goto parse_flag;
886:
887: case sUseLogin:
888: intptr = &options->use_login;
1.111 markus 889: goto parse_flag;
890:
891: case sCompression:
892: intptr = &options->compression;
1.143 markus 893: arg = strdelim(&cp);
894: if (!arg || *arg == '\0')
895: fatal("%s line %d: missing yes/no/delayed "
896: "argument.", filename, linenum);
897: value = 0; /* silence compiler */
898: if (strcmp(arg, "delayed") == 0)
899: value = COMP_DELAYED;
900: else if (strcmp(arg, "yes") == 0)
901: value = COMP_ZLIB;
902: else if (strcmp(arg, "no") == 0)
903: value = COMP_NONE;
904: else
905: fatal("%s line %d: Bad yes/no/delayed "
906: "argument: %s", filename, linenum, arg);
907: if (*intptr == -1)
908: *intptr = value;
909: break;
1.94 markus 910:
911: case sGatewayPorts:
912: intptr = &options->gateway_ports;
1.139 djm 913: arg = strdelim(&cp);
914: if (!arg || *arg == '\0')
915: fatal("%s line %d: missing yes/no/clientspecified "
916: "argument.", filename, linenum);
917: value = 0; /* silence compiler */
918: if (strcmp(arg, "clientspecified") == 0)
919: value = 2;
920: else if (strcmp(arg, "yes") == 0)
921: value = 1;
922: else if (strcmp(arg, "no") == 0)
923: value = 0;
924: else
925: fatal("%s line %d: Bad yes/no/clientspecified "
926: "argument: %s", filename, linenum, arg);
1.169 dtucker 927: if (*activep && *intptr == -1)
1.139 djm 928: *intptr = value;
929: break;
1.25 markus 930:
1.122 markus 931: case sUseDNS:
932: intptr = &options->use_dns;
1.94 markus 933: goto parse_flag;
1.53 markus 934:
1.94 markus 935: case sLogFacility:
936: intptr = (int *) &options->log_facility;
937: arg = strdelim(&cp);
938: value = log_facility_number(arg);
1.101 markus 939: if (value == SYSLOG_FACILITY_NOT_SET)
1.94 markus 940: fatal("%.200s line %d: unsupported log facility '%s'",
941: filename, linenum, arg ? arg : "<NONE>");
942: if (*intptr == -1)
943: *intptr = (SyslogFacility) value;
944: break;
1.25 markus 945:
1.94 markus 946: case sLogLevel:
947: intptr = (int *) &options->log_level;
948: arg = strdelim(&cp);
949: value = log_level_number(arg);
1.101 markus 950: if (value == SYSLOG_LEVEL_NOT_SET)
1.94 markus 951: fatal("%.200s line %d: unsupported log level '%s'",
952: filename, linenum, arg ? arg : "<NONE>");
953: if (*intptr == -1)
954: *intptr = (LogLevel) value;
955: break;
956:
957: case sAllowTcpForwarding:
958: intptr = &options->allow_tcp_forwarding;
959: goto parse_flag;
1.102 provos 960:
961: case sUsePrivilegeSeparation:
962: intptr = &use_privsep;
963: goto parse_flag;
1.94 markus 964:
965: case sAllowUsers:
966: while ((arg = strdelim(&cp)) && *arg != '\0') {
967: if (options->num_allow_users >= MAX_ALLOW_USERS)
968: fatal("%s line %d: too many allow users.",
969: filename, linenum);
1.112 deraadt 970: options->allow_users[options->num_allow_users++] =
971: xstrdup(arg);
1.94 markus 972: }
973: break;
1.25 markus 974:
1.94 markus 975: case sDenyUsers:
976: while ((arg = strdelim(&cp)) && *arg != '\0') {
977: if (options->num_deny_users >= MAX_DENY_USERS)
1.163 stevesk 978: fatal("%s line %d: too many deny users.",
1.94 markus 979: filename, linenum);
1.112 deraadt 980: options->deny_users[options->num_deny_users++] =
981: xstrdup(arg);
1.94 markus 982: }
983: break;
1.25 markus 984:
1.94 markus 985: case sAllowGroups:
986: while ((arg = strdelim(&cp)) && *arg != '\0') {
987: if (options->num_allow_groups >= MAX_ALLOW_GROUPS)
988: fatal("%s line %d: too many allow groups.",
989: filename, linenum);
1.112 deraadt 990: options->allow_groups[options->num_allow_groups++] =
991: xstrdup(arg);
1.94 markus 992: }
993: break;
1.33 markus 994:
1.94 markus 995: case sDenyGroups:
996: while ((arg = strdelim(&cp)) && *arg != '\0') {
997: if (options->num_deny_groups >= MAX_DENY_GROUPS)
998: fatal("%s line %d: too many deny groups.",
999: filename, linenum);
1000: options->deny_groups[options->num_deny_groups++] = xstrdup(arg);
1001: }
1002: break;
1.66 markus 1003:
1.94 markus 1004: case sCiphers:
1005: arg = strdelim(&cp);
1006: if (!arg || *arg == '\0')
1007: fatal("%s line %d: Missing argument.", filename, linenum);
1008: if (!ciphers_valid(arg))
1009: fatal("%s line %d: Bad SSH2 cipher spec '%s'.",
1010: filename, linenum, arg ? arg : "<NONE>");
1011: if (options->ciphers == NULL)
1012: options->ciphers = xstrdup(arg);
1013: break;
1.33 markus 1014:
1.94 markus 1015: case sMacs:
1016: arg = strdelim(&cp);
1017: if (!arg || *arg == '\0')
1018: fatal("%s line %d: Missing argument.", filename, linenum);
1019: if (!mac_valid(arg))
1020: fatal("%s line %d: Bad SSH2 mac spec '%s'.",
1021: filename, linenum, arg ? arg : "<NONE>");
1022: if (options->macs == NULL)
1023: options->macs = xstrdup(arg);
1024: break;
1.43 jakob 1025:
1.94 markus 1026: case sProtocol:
1027: intptr = &options->protocol;
1028: arg = strdelim(&cp);
1029: if (!arg || *arg == '\0')
1030: fatal("%s line %d: Missing argument.", filename, linenum);
1031: value = proto_spec(arg);
1032: if (value == SSH_PROTO_UNKNOWN)
1033: fatal("%s line %d: Bad protocol spec '%s'.",
1.95 deraadt 1034: filename, linenum, arg ? arg : "<NONE>");
1.94 markus 1035: if (*intptr == SSH_PROTO_UNKNOWN)
1036: *intptr = value;
1037: break;
1038:
1039: case sSubsystem:
1040: if (options->num_subsystems >= MAX_SUBSYSTEMS) {
1041: fatal("%s line %d: too many subsystems defined.",
1.95 deraadt 1042: filename, linenum);
1.94 markus 1043: }
1044: arg = strdelim(&cp);
1045: if (!arg || *arg == '\0')
1046: fatal("%s line %d: Missing subsystem name.",
1.95 deraadt 1047: filename, linenum);
1.153 dtucker 1048: if (!*activep) {
1049: arg = strdelim(&cp);
1050: break;
1051: }
1.94 markus 1052: for (i = 0; i < options->num_subsystems; i++)
1053: if (strcmp(arg, options->subsystem_name[i]) == 0)
1054: fatal("%s line %d: Subsystem '%s' already defined.",
1.95 deraadt 1055: filename, linenum, arg);
1.94 markus 1056: options->subsystem_name[options->num_subsystems] = xstrdup(arg);
1057: arg = strdelim(&cp);
1058: if (!arg || *arg == '\0')
1059: fatal("%s line %d: Missing subsystem command.",
1.95 deraadt 1060: filename, linenum);
1.94 markus 1061: options->subsystem_command[options->num_subsystems] = xstrdup(arg);
1.151 djm 1062:
1063: /* Collect arguments (separate to executable) */
1064: p = xstrdup(arg);
1065: len = strlen(p) + 1;
1066: while ((arg = strdelim(&cp)) != NULL && *arg != '\0') {
1067: len += 1 + strlen(arg);
1068: p = xrealloc(p, 1, len);
1069: strlcat(p, " ", len);
1070: strlcat(p, arg, len);
1071: }
1072: options->subsystem_args[options->num_subsystems] = p;
1.94 markus 1073: options->num_subsystems++;
1074: break;
1.46 markus 1075:
1.94 markus 1076: case sMaxStartups:
1077: arg = strdelim(&cp);
1078: if (!arg || *arg == '\0')
1079: fatal("%s line %d: Missing MaxStartups spec.",
1.95 deraadt 1080: filename, linenum);
1.94 markus 1081: if ((n = sscanf(arg, "%d:%d:%d",
1082: &options->max_startups_begin,
1083: &options->max_startups_rate,
1084: &options->max_startups)) == 3) {
1085: if (options->max_startups_begin >
1086: options->max_startups ||
1087: options->max_startups_rate > 100 ||
1088: options->max_startups_rate < 1)
1.50 markus 1089: fatal("%s line %d: Illegal MaxStartups spec.",
1.87 stevesk 1090: filename, linenum);
1.94 markus 1091: } else if (n != 1)
1092: fatal("%s line %d: Illegal MaxStartups spec.",
1093: filename, linenum);
1094: else
1095: options->max_startups = options->max_startups_begin;
1096: break;
1.133 dtucker 1097:
1098: case sMaxAuthTries:
1099: intptr = &options->max_authtries;
1100: goto parse_int;
1.94 markus 1101:
1102: case sBanner:
1103: charptr = &options->banner;
1104: goto parse_filename;
1105: /*
1106: * These options can contain %X options expanded at
1107: * connect time, so that you can specify paths like:
1108: *
1109: * AuthorizedKeysFile /etc/ssh_keys/%u
1110: */
1111: case sAuthorizedKeysFile:
1112: case sAuthorizedKeysFile2:
1.163 stevesk 1113: charptr = (opcode == sAuthorizedKeysFile) ?
1.94 markus 1114: &options->authorized_keys_file :
1115: &options->authorized_keys_file2;
1116: goto parse_filename;
1117:
1118: case sClientAliveInterval:
1119: intptr = &options->client_alive_interval;
1120: goto parse_time;
1121:
1122: case sClientAliveCountMax:
1123: intptr = &options->client_alive_count_max;
1124: goto parse_int;
1.131 djm 1125:
1126: case sAcceptEnv:
1127: while ((arg = strdelim(&cp)) && *arg != '\0') {
1128: if (strchr(arg, '=') != NULL)
1129: fatal("%s line %d: Invalid environment name.",
1130: filename, linenum);
1131: if (options->num_accept_env >= MAX_ACCEPT_ENV)
1132: fatal("%s line %d: too many allow env.",
1133: filename, linenum);
1.153 dtucker 1134: if (!*activep)
1135: break;
1.131 djm 1136: options->accept_env[options->num_accept_env++] =
1137: xstrdup(arg);
1138: }
1139: break;
1.145 reyk 1140:
1141: case sPermitTunnel:
1142: intptr = &options->permit_tun;
1.146 reyk 1143: arg = strdelim(&cp);
1144: if (!arg || *arg == '\0')
1145: fatal("%s line %d: Missing yes/point-to-point/"
1146: "ethernet/no argument.", filename, linenum);
1147: value = 0; /* silence compiler */
1148: if (strcasecmp(arg, "ethernet") == 0)
1149: value = SSH_TUNMODE_ETHERNET;
1150: else if (strcasecmp(arg, "point-to-point") == 0)
1151: value = SSH_TUNMODE_POINTOPOINT;
1152: else if (strcasecmp(arg, "yes") == 0)
1153: value = SSH_TUNMODE_YES;
1154: else if (strcasecmp(arg, "no") == 0)
1155: value = SSH_TUNMODE_NO;
1156: else
1157: fatal("%s line %d: Bad yes/point-to-point/ethernet/"
1158: "no argument: %s", filename, linenum, arg);
1159: if (*intptr == -1)
1160: *intptr = value;
1161: break;
1.94 markus 1162:
1.153 dtucker 1163: case sMatch:
1164: if (cmdline)
1165: fatal("Match directive not supported as a command-line "
1166: "option");
1167: value = match_cfg_line(&cp, linenum, user, host, address);
1168: if (value < 0)
1169: fatal("%s line %d: Bad Match condition", filename,
1170: linenum);
1171: *activep = value;
1.156 dtucker 1172: break;
1173:
1174: case sPermitOpen:
1175: arg = strdelim(&cp);
1176: if (!arg || *arg == '\0')
1177: fatal("%s line %d: missing PermitOpen specification",
1178: filename, linenum);
1.167 dtucker 1179: n = options->num_permitted_opens; /* modified later */
1.156 dtucker 1180: if (strcmp(arg, "any") == 0) {
1.167 dtucker 1181: if (*activep && n == -1) {
1.156 dtucker 1182: channel_clear_adm_permitted_opens();
1.159 dtucker 1183: options->num_permitted_opens = 0;
1184: }
1.156 dtucker 1185: break;
1186: }
1.166 dtucker 1187: if (*activep && n == -1)
1188: channel_clear_adm_permitted_opens();
1.159 dtucker 1189: for (; arg != NULL && *arg != '\0'; arg = strdelim(&cp)) {
1190: p = hpdelim(&arg);
1191: if (p == NULL)
1192: fatal("%s line %d: missing host in PermitOpen",
1193: filename, linenum);
1194: p = cleanhostname(p);
1195: if (arg == NULL || (port = a2port(arg)) == 0)
1196: fatal("%s line %d: bad port number in "
1197: "PermitOpen", filename, linenum);
1.166 dtucker 1198: if (*activep && n == -1)
1.159 dtucker 1199: options->num_permitted_opens =
1200: channel_add_adm_permitted_opens(p, port);
1201: }
1.153 dtucker 1202: break;
1203:
1.158 dtucker 1204: case sForceCommand:
1205: if (cp == NULL)
1206: fatal("%.200s line %d: Missing argument.", filename,
1207: linenum);
1208: len = strspn(cp, WHITESPACE);
1209: if (*activep && options->adm_forced_command == NULL)
1210: options->adm_forced_command = xstrdup(cp + len);
1211: return 0;
1212:
1.94 markus 1213: case sDeprecated:
1.117 itojun 1214: logit("%s line %d: Deprecated option %s",
1.121 jakob 1215: filename, linenum, arg);
1216: while (arg)
1217: arg = strdelim(&cp);
1218: break;
1219:
1220: case sUnsupported:
1221: logit("%s line %d: Unsupported option %s",
1.94 markus 1222: filename, linenum, arg);
1223: while (arg)
1224: arg = strdelim(&cp);
1225: break;
1226:
1227: default:
1228: fatal("%s line %d: Missing handler for opcode %s (%d)",
1229: filename, linenum, arg, opcode);
1230: }
1231: if ((arg = strdelim(&cp)) != NULL && *arg != '\0')
1232: fatal("%s line %d: garbage at end of line; \"%.200s\".",
1233: filename, linenum, arg);
1234: return 0;
1235: }
1236:
1237: /* Reads the server configuration file. */
1.25 markus 1238:
1.94 markus 1239: void
1.134 djm 1240: load_server_config(const char *filename, Buffer *conf)
1.94 markus 1241: {
1.134 djm 1242: char line[1024], *cp;
1.94 markus 1243: FILE *f;
1.81 stevesk 1244:
1.134 djm 1245: debug2("%s: filename %s", __func__, filename);
1246: if ((f = fopen(filename, "r")) == NULL) {
1.94 markus 1247: perror(filename);
1248: exit(1);
1249: }
1.134 djm 1250: buffer_clear(conf);
1251: while (fgets(line, sizeof(line), f)) {
1252: /*
1253: * Trim out comments and strip whitespace
1.135 deraadt 1254: * NB - preserve newlines, they are needed to reproduce
1.134 djm 1255: * line numbers later for error messages
1256: */
1257: if ((cp = strchr(line, '#')) != NULL)
1258: memcpy(cp, "\n", 2);
1259: cp = line + strspn(line, " \t\r");
1260:
1261: buffer_append(conf, cp, strlen(cp));
1262: }
1263: buffer_append(conf, "\0", 1);
1264: fclose(f);
1265: debug2("%s: done config len = %d", __func__, buffer_len(conf));
1266: }
1267:
1268: void
1.153 dtucker 1269: parse_server_match_config(ServerOptions *options, const char *user,
1270: const char *host, const char *address)
1271: {
1272: ServerOptions mo;
1273:
1274: initialize_server_options(&mo);
1275: parse_server_config(&mo, "reprocess config", &cfg, user, host, address);
1.168 dtucker 1276: copy_set_server_options(options, &mo, 0);
1.153 dtucker 1277: }
1278:
1.168 dtucker 1279: /* Helper macros */
1280: #define M_CP_INTOPT(n) do {\
1281: if (src->n != -1) \
1282: dst->n = src->n; \
1283: } while (0)
1284: #define M_CP_STROPT(n) do {\
1285: if (src->n != NULL) { \
1286: if (dst->n != NULL) \
1287: xfree(dst->n); \
1288: dst->n = src->n; \
1289: } \
1290: } while(0)
1291:
1292: /*
1293: * Copy any supported values that are set.
1294: *
1295: * If the preauth flag is set, we do not bother copying the the string or
1296: * array values that are not used pre-authentication, because any that we
1297: * do use must be explictly sent in mm_getpwnamallow().
1298: */
1.153 dtucker 1299: void
1.168 dtucker 1300: copy_set_server_options(ServerOptions *dst, ServerOptions *src, int preauth)
1.153 dtucker 1301: {
1.168 dtucker 1302: M_CP_INTOPT(password_authentication);
1303: M_CP_INTOPT(gss_authentication);
1304: M_CP_INTOPT(rsa_authentication);
1305: M_CP_INTOPT(pubkey_authentication);
1306: M_CP_INTOPT(kerberos_authentication);
1307: M_CP_INTOPT(hostbased_authentication);
1308: M_CP_INTOPT(kbd_interactive_authentication);
1309:
1310: M_CP_INTOPT(allow_tcp_forwarding);
1311: M_CP_INTOPT(gateway_ports);
1312: M_CP_INTOPT(x11_display_offset);
1313: M_CP_INTOPT(x11_forwarding);
1314: M_CP_INTOPT(x11_use_localhost);
1315:
1316: M_CP_STROPT(banner);
1317: if (preauth)
1318: return;
1319: M_CP_STROPT(adm_forced_command);
1.153 dtucker 1320: }
1.168 dtucker 1321:
1322: #undef M_CP_INTOPT
1323: #undef M_CP_STROPT
1.153 dtucker 1324:
1325: void
1326: parse_server_config(ServerOptions *options, const char *filename, Buffer *conf,
1327: const char *user, const char *host, const char *address)
1.134 djm 1328: {
1.153 dtucker 1329: int active, linenum, bad_options = 0;
1.136 dtucker 1330: char *cp, *obuf, *cbuf;
1.134 djm 1331:
1332: debug2("%s: config %s len %d", __func__, filename, buffer_len(conf));
1333:
1.136 dtucker 1334: obuf = cbuf = xstrdup(buffer_ptr(conf));
1.153 dtucker 1335: active = user ? 0 : 1;
1.137 dtucker 1336: linenum = 1;
1.140 deraadt 1337: while ((cp = strsep(&cbuf, "\n")) != NULL) {
1.134 djm 1338: if (process_server_config_line(options, cp, filename,
1.153 dtucker 1339: linenum++, &active, user, host, address) != 0)
1.94 markus 1340: bad_options++;
1.1 deraadt 1341: }
1.136 dtucker 1342: xfree(obuf);
1.78 stevesk 1343: if (bad_options > 0)
1344: fatal("%s: terminating, %d bad configuration options",
1345: filename, bad_options);
1.1 deraadt 1346: }
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