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Damien Millerd4a8b7e1999-10-27 13:42:43 +10001/*
Damien Miller95def091999-11-25 00:26:21 +11002 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
3 * All rights reserved
Damien Miller4af51302000-04-16 11:18:38 +10004 *
Damien Millere4340be2000-09-16 13:29:08 +11005 * 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".
Damien Miller95def091999-11-25 00:26:21 +110010 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100011
12#include "includes.h"
Damien Miller7b58e802005-12-13 19:33:19 +110013RCSID("$OpenBSD: servconf.c,v 1.146 2005/12/08 18:34:11 reyk Exp $");
Damien Millerd4a8b7e1999-10-27 13:42:43 +100014
15#include "ssh.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000016#include "log.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100017#include "servconf.h"
18#include "xmalloc.h"
Damien Miller78928792000-04-12 20:17:38 +100019#include "compat.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000020#include "pathnames.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000021#include "misc.h"
22#include "cipher.h"
Ben Lindstrom06b33aa2001-02-15 03:01:59 +000023#include "kex.h"
24#include "mac.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000025
Ben Lindstrombba81212001-06-25 05:01:22 +000026static void add_listen_addr(ServerOptions *, char *, u_short);
27static void add_one_listen_addr(ServerOptions *, char *, u_short);
Damien Miller34132e52000-01-14 15:45:46 +110028
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000029/* Use of privilege separation or not */
30extern int use_privsep;
Ben Lindstrom226cfa02001-01-22 05:34:40 +000031
Damien Millerd4a8b7e1999-10-27 13:42:43 +100032/* Initializes the server options to their default values. */
33
Damien Miller4af51302000-04-16 11:18:38 +100034void
Damien Miller95def091999-11-25 00:26:21 +110035initialize_server_options(ServerOptions *options)
Damien Millerd4a8b7e1999-10-27 13:42:43 +100036{
Damien Miller95def091999-11-25 00:26:21 +110037 memset(options, 0, sizeof(*options));
Damien Miller726273e2001-11-12 11:40:11 +110038
39 /* Portable-specific options */
Damien Miller4e448a32003-05-14 15:11:48 +100040 options->use_pam = -1;
Damien Miller726273e2001-11-12 11:40:11 +110041
42 /* Standard Options */
Damien Miller34132e52000-01-14 15:45:46 +110043 options->num_ports = 0;
44 options->ports_from_cmdline = 0;
45 options->listen_addrs = NULL;
Darren Tucker0f383232005-01-20 10:57:56 +110046 options->address_family = -1;
Damien Miller0bc1bd82000-11-13 22:57:25 +110047 options->num_host_key_files = 0;
Damien Miller6f83b8e2000-05-02 09:23:45 +100048 options->pid_file = NULL;
Damien Miller95def091999-11-25 00:26:21 +110049 options->server_key_bits = -1;
50 options->login_grace_time = -1;
51 options->key_regeneration_time = -1;
Ben Lindstromd8a90212001-02-15 03:08:27 +000052 options->permit_root_login = PERMIT_NOT_SET;
Damien Miller95def091999-11-25 00:26:21 +110053 options->ignore_rhosts = -1;
54 options->ignore_user_known_hosts = -1;
55 options->print_motd = -1;
Ben Lindstrom7bfff362001-03-26 05:45:53 +000056 options->print_lastlog = -1;
Damien Miller95def091999-11-25 00:26:21 +110057 options->x11_forwarding = -1;
58 options->x11_display_offset = -1;
Damien Miller95c249f2002-02-05 12:11:34 +110059 options->x11_use_localhost = -1;
Damien Millerd3a18572000-06-07 19:55:44 +100060 options->xauth_location = NULL;
Damien Miller95def091999-11-25 00:26:21 +110061 options->strict_modes = -1;
Damien Miller12c150e2003-12-17 16:31:10 +110062 options->tcp_keep_alive = -1;
Damien Millerfcd93202002-02-05 12:26:34 +110063 options->log_facility = SYSLOG_FACILITY_NOT_SET;
64 options->log_level = SYSLOG_LEVEL_NOT_SET;
Damien Miller95def091999-11-25 00:26:21 +110065 options->rhosts_rsa_authentication = -1;
Ben Lindstrom5eabda32001-04-12 23:34:34 +000066 options->hostbased_authentication = -1;
67 options->hostbased_uses_name_from_packet_only = -1;
Damien Miller95def091999-11-25 00:26:21 +110068 options->rsa_authentication = -1;
Damien Miller0bc1bd82000-11-13 22:57:25 +110069 options->pubkey_authentication = -1;
Damien Miller95def091999-11-25 00:26:21 +110070 options->kerberos_authentication = -1;
71 options->kerberos_or_local_passwd = -1;
72 options->kerberos_ticket_cleanup = -1;
Darren Tucker22ef5082003-12-31 11:37:34 +110073 options->kerberos_get_afs_token = -1;
Darren Tucker0efd1552003-08-26 11:49:55 +100074 options->gss_authentication=-1;
75 options->gss_cleanup_creds = -1;
Damien Miller95def091999-11-25 00:26:21 +110076 options->password_authentication = -1;
Damien Miller874d77b2000-10-14 16:23:11 +110077 options->kbd_interactive_authentication = -1;
Ben Lindstrom551ea372001-06-05 18:56:16 +000078 options->challenge_response_authentication = -1;
Damien Miller95def091999-11-25 00:26:21 +110079 options->permit_empty_passwd = -1;
Ben Lindstrom5d860f02002-08-01 01:28:38 +000080 options->permit_user_env = -1;
Damien Miller95def091999-11-25 00:26:21 +110081 options->use_login = -1;
Ben Lindstrom23e0f662002-06-21 01:09:47 +000082 options->compression = -1;
Damien Miller50a41ed2000-10-16 12:14:42 +110083 options->allow_tcp_forwarding = -1;
Damien Miller95def091999-11-25 00:26:21 +110084 options->num_allow_users = 0;
85 options->num_deny_users = 0;
86 options->num_allow_groups = 0;
87 options->num_deny_groups = 0;
Damien Miller78928792000-04-12 20:17:38 +100088 options->ciphers = NULL;
Ben Lindstrom06b33aa2001-02-15 03:01:59 +000089 options->macs = NULL;
Damien Miller78928792000-04-12 20:17:38 +100090 options->protocol = SSH_PROTO_UNKNOWN;
Damien Millere247cc42000-05-07 12:03:14 +100091 options->gateway_ports = -1;
Damien Millerf6d9e222000-06-18 14:50:44 +100092 options->num_subsystems = 0;
Damien Miller942da032000-08-18 13:59:06 +100093 options->max_startups_begin = -1;
94 options->max_startups_rate = -1;
Damien Miller37023962000-07-11 17:31:38 +100095 options->max_startups = -1;
Darren Tucker89413db2004-05-24 10:36:23 +100096 options->max_authtries = -1;
Ben Lindstrom48bd7c12001-01-09 00:35:42 +000097 options->banner = NULL;
Damien Miller3a961dc2003-06-03 10:25:48 +100098 options->use_dns = -1;
Ben Lindstrom5744dc42001-04-13 23:28:01 +000099 options->client_alive_interval = -1;
100 options->client_alive_count_max = -1;
Ben Lindstrombfb3a0e2001-06-05 20:25:05 +0000101 options->authorized_keys_file = NULL;
102 options->authorized_keys_file2 = NULL;
Darren Tucker46bc0752004-05-02 22:11:30 +1000103 options->num_accept_env = 0;
Damien Millerd27b9472005-12-13 19:29:02 +1100104 options->permit_tun = -1;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000105
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000106 /* Needs to be accessable in many places */
107 use_privsep = -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000108}
109
Damien Miller4af51302000-04-16 11:18:38 +1000110void
Damien Miller95def091999-11-25 00:26:21 +1100111fill_default_server_options(ServerOptions *options)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000112{
Damien Miller726273e2001-11-12 11:40:11 +1100113 /* Portable-specific options */
Damien Miller4e448a32003-05-14 15:11:48 +1000114 if (options->use_pam == -1)
Damien Miller5c3a5582003-09-23 22:12:38 +1000115 options->use_pam = 0;
Damien Miller726273e2001-11-12 11:40:11 +1100116
117 /* Standard Options */
Damien Miller0bc1bd82000-11-13 22:57:25 +1100118 if (options->protocol == SSH_PROTO_UNKNOWN)
119 options->protocol = SSH_PROTO_1|SSH_PROTO_2;
120 if (options->num_host_key_files == 0) {
121 /* fill default hostkeys for protocols */
122 if (options->protocol & SSH_PROTO_1)
Damien Miller7fc23732002-01-22 23:19:11 +1100123 options->host_key_files[options->num_host_key_files++] =
124 _PATH_HOST_KEY_FILE;
125 if (options->protocol & SSH_PROTO_2) {
126 options->host_key_files[options->num_host_key_files++] =
127 _PATH_HOST_RSA_KEY_FILE;
128 options->host_key_files[options->num_host_key_files++] =
129 _PATH_HOST_DSA_KEY_FILE;
130 }
Damien Miller0bc1bd82000-11-13 22:57:25 +1100131 }
Damien Miller34132e52000-01-14 15:45:46 +1100132 if (options->num_ports == 0)
133 options->ports[options->num_ports++] = SSH_DEFAULT_PORT;
134 if (options->listen_addrs == NULL)
Ben Lindstrom19066a12001-04-12 23:39:26 +0000135 add_listen_addr(options, NULL, 0);
Damien Miller6f83b8e2000-05-02 09:23:45 +1000136 if (options->pid_file == NULL)
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000137 options->pid_file = _PATH_SSH_DAEMON_PID_FILE;
Damien Miller95def091999-11-25 00:26:21 +1100138 if (options->server_key_bits == -1)
139 options->server_key_bits = 768;
140 if (options->login_grace_time == -1)
Damien Millerc1348632002-09-05 14:35:14 +1000141 options->login_grace_time = 120;
Damien Miller95def091999-11-25 00:26:21 +1100142 if (options->key_regeneration_time == -1)
143 options->key_regeneration_time = 3600;
Ben Lindstromd8a90212001-02-15 03:08:27 +0000144 if (options->permit_root_login == PERMIT_NOT_SET)
145 options->permit_root_login = PERMIT_YES;
Damien Miller95def091999-11-25 00:26:21 +1100146 if (options->ignore_rhosts == -1)
Damien Miller98c7ad62000-03-09 21:27:49 +1100147 options->ignore_rhosts = 1;
Damien Miller95def091999-11-25 00:26:21 +1100148 if (options->ignore_user_known_hosts == -1)
149 options->ignore_user_known_hosts = 0;
Damien Miller95def091999-11-25 00:26:21 +1100150 if (options->print_motd == -1)
151 options->print_motd = 1;
Ben Lindstrom7bfff362001-03-26 05:45:53 +0000152 if (options->print_lastlog == -1)
153 options->print_lastlog = 1;
Damien Miller95def091999-11-25 00:26:21 +1100154 if (options->x11_forwarding == -1)
Damien Miller98c7ad62000-03-09 21:27:49 +1100155 options->x11_forwarding = 0;
Damien Miller95def091999-11-25 00:26:21 +1100156 if (options->x11_display_offset == -1)
Damien Miller98c7ad62000-03-09 21:27:49 +1100157 options->x11_display_offset = 10;
Damien Miller95c249f2002-02-05 12:11:34 +1100158 if (options->x11_use_localhost == -1)
159 options->x11_use_localhost = 1;
Damien Millerd3a18572000-06-07 19:55:44 +1000160 if (options->xauth_location == NULL)
Ben Lindstrom1bf11f62001-06-09 01:48:01 +0000161 options->xauth_location = _PATH_XAUTH;
Damien Miller95def091999-11-25 00:26:21 +1100162 if (options->strict_modes == -1)
163 options->strict_modes = 1;
Damien Miller12c150e2003-12-17 16:31:10 +1100164 if (options->tcp_keep_alive == -1)
165 options->tcp_keep_alive = 1;
Damien Millerfcd93202002-02-05 12:26:34 +1100166 if (options->log_facility == SYSLOG_FACILITY_NOT_SET)
Damien Miller95def091999-11-25 00:26:21 +1100167 options->log_facility = SYSLOG_FACILITY_AUTH;
Damien Millerfcd93202002-02-05 12:26:34 +1100168 if (options->log_level == SYSLOG_LEVEL_NOT_SET)
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000169 options->log_level = SYSLOG_LEVEL_INFO;
Damien Miller95def091999-11-25 00:26:21 +1100170 if (options->rhosts_rsa_authentication == -1)
Damien Miller98c7ad62000-03-09 21:27:49 +1100171 options->rhosts_rsa_authentication = 0;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000172 if (options->hostbased_authentication == -1)
173 options->hostbased_authentication = 0;
174 if (options->hostbased_uses_name_from_packet_only == -1)
175 options->hostbased_uses_name_from_packet_only = 0;
Damien Miller95def091999-11-25 00:26:21 +1100176 if (options->rsa_authentication == -1)
177 options->rsa_authentication = 1;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100178 if (options->pubkey_authentication == -1)
179 options->pubkey_authentication = 1;
Damien Miller95def091999-11-25 00:26:21 +1100180 if (options->kerberos_authentication == -1)
Damien Millerd7de14b2002-04-23 21:04:51 +1000181 options->kerberos_authentication = 0;
Damien Miller95def091999-11-25 00:26:21 +1100182 if (options->kerberos_or_local_passwd == -1)
183 options->kerberos_or_local_passwd = 1;
184 if (options->kerberos_ticket_cleanup == -1)
185 options->kerberos_ticket_cleanup = 1;
Darren Tucker22ef5082003-12-31 11:37:34 +1100186 if (options->kerberos_get_afs_token == -1)
187 options->kerberos_get_afs_token = 0;
Darren Tucker0efd1552003-08-26 11:49:55 +1000188 if (options->gss_authentication == -1)
189 options->gss_authentication = 0;
190 if (options->gss_cleanup_creds == -1)
191 options->gss_cleanup_creds = 1;
Damien Miller95def091999-11-25 00:26:21 +1100192 if (options->password_authentication == -1)
193 options->password_authentication = 1;
Damien Miller874d77b2000-10-14 16:23:11 +1100194 if (options->kbd_interactive_authentication == -1)
195 options->kbd_interactive_authentication = 0;
Ben Lindstrom551ea372001-06-05 18:56:16 +0000196 if (options->challenge_response_authentication == -1)
197 options->challenge_response_authentication = 1;
Damien Miller95def091999-11-25 00:26:21 +1100198 if (options->permit_empty_passwd == -1)
Damien Miller98c7ad62000-03-09 21:27:49 +1100199 options->permit_empty_passwd = 0;
Ben Lindstrom5d860f02002-08-01 01:28:38 +0000200 if (options->permit_user_env == -1)
201 options->permit_user_env = 0;
Damien Miller95def091999-11-25 00:26:21 +1100202 if (options->use_login == -1)
203 options->use_login = 0;
Ben Lindstrom23e0f662002-06-21 01:09:47 +0000204 if (options->compression == -1)
Damien Miller9786e6e2005-07-26 21:54:56 +1000205 options->compression = COMP_DELAYED;
Damien Miller50a41ed2000-10-16 12:14:42 +1100206 if (options->allow_tcp_forwarding == -1)
207 options->allow_tcp_forwarding = 1;
Damien Millere247cc42000-05-07 12:03:14 +1000208 if (options->gateway_ports == -1)
209 options->gateway_ports = 0;
Damien Miller37023962000-07-11 17:31:38 +1000210 if (options->max_startups == -1)
211 options->max_startups = 10;
Damien Miller942da032000-08-18 13:59:06 +1000212 if (options->max_startups_rate == -1)
213 options->max_startups_rate = 100; /* 100% */
214 if (options->max_startups_begin == -1)
215 options->max_startups_begin = options->max_startups;
Darren Tucker89413db2004-05-24 10:36:23 +1000216 if (options->max_authtries == -1)
217 options->max_authtries = DEFAULT_AUTH_FAIL_MAX;
Damien Miller3a961dc2003-06-03 10:25:48 +1000218 if (options->use_dns == -1)
219 options->use_dns = 1;
Ben Lindstrom5744dc42001-04-13 23:28:01 +0000220 if (options->client_alive_interval == -1)
Damien Miller9f0f5c62001-12-21 14:45:46 +1100221 options->client_alive_interval = 0;
Ben Lindstrom5744dc42001-04-13 23:28:01 +0000222 if (options->client_alive_count_max == -1)
223 options->client_alive_count_max = 3;
Damien Miller75413ac2001-11-12 11:14:35 +1100224 if (options->authorized_keys_file2 == NULL) {
225 /* authorized_keys_file2 falls back to authorized_keys_file */
226 if (options->authorized_keys_file != NULL)
227 options->authorized_keys_file2 = options->authorized_keys_file;
228 else
229 options->authorized_keys_file2 = _PATH_SSH_USER_PERMITTED_KEYS2;
230 }
231 if (options->authorized_keys_file == NULL)
232 options->authorized_keys_file = _PATH_SSH_USER_PERMITTED_KEYS;
Damien Millerd27b9472005-12-13 19:29:02 +1100233 if (options->permit_tun == -1)
Damien Miller7b58e802005-12-13 19:33:19 +1100234 options->permit_tun = SSH_TUNMODE_NO;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000235
Ben Lindstromfb62a692002-06-06 19:47:11 +0000236 /* Turn privilege separation on by default */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000237 if (use_privsep == -1)
Ben Lindstromfb62a692002-06-06 19:47:11 +0000238 use_privsep = 1;
Damien Miller4903eb42002-06-21 16:20:44 +1000239
Tim Rice40017b02002-07-14 13:36:49 -0700240#ifndef HAVE_MMAP
Damien Miller4903eb42002-06-21 16:20:44 +1000241 if (use_privsep && options->compression == 1) {
242 error("This platform does not support both privilege "
243 "separation and compression");
244 error("Compression disabled");
245 options->compression = 0;
246 }
247#endif
248
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000249}
250
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000251/* Keyword tokens. */
Damien Miller95def091999-11-25 00:26:21 +1100252typedef enum {
253 sBadOption, /* == unknown option */
Damien Miller726273e2001-11-12 11:40:11 +1100254 /* Portable-specific options */
Damien Miller4e448a32003-05-14 15:11:48 +1000255 sUsePAM,
Damien Miller726273e2001-11-12 11:40:11 +1100256 /* Standard Options */
Damien Miller95def091999-11-25 00:26:21 +1100257 sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime,
258 sPermitRootLogin, sLogFacility, sLogLevel,
Darren Tuckerec960f22003-08-13 20:37:05 +1000259 sRhostsRSAAuthentication, sRSAAuthentication,
Damien Miller95def091999-11-25 00:26:21 +1100260 sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup,
Darren Tucker22ef5082003-12-31 11:37:34 +1100261 sKerberosGetAFSToken,
Darren Tucker6aaa58c2003-08-02 22:24:49 +1000262 sKerberosTgtPassing, sChallengeResponseAuthentication,
Darren Tucker0f383232005-01-20 10:57:56 +1100263 sPasswordAuthentication, sKbdInteractiveAuthentication,
264 sListenAddress, sAddressFamily,
Ben Lindstrom7bfff362001-03-26 05:45:53 +0000265 sPrintMotd, sPrintLastLog, sIgnoreRhosts,
Damien Miller95c249f2002-02-05 12:11:34 +1100266 sX11Forwarding, sX11DisplayOffset, sX11UseLocalhost,
Damien Miller12c150e2003-12-17 16:31:10 +1100267 sStrictModes, sEmptyPasswd, sTCPKeepAlive,
Ben Lindstrom5d860f02002-08-01 01:28:38 +0000268 sPermitUserEnvironment, sUseLogin, sAllowTcpForwarding, sCompression,
Damien Miller50a41ed2000-10-16 12:14:42 +1100269 sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups,
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000270 sIgnoreUserKnownHosts, sCiphers, sMacs, sProtocol, sPidFile,
Darren Tucker89413db2004-05-24 10:36:23 +1000271 sGatewayPorts, sPubkeyAuthentication, sXAuthLocation, sSubsystem,
272 sMaxStartups, sMaxAuthTries,
Damien Miller3a961dc2003-06-03 10:25:48 +1000273 sBanner, sUseDNS, sHostbasedAuthentication,
Damien Miller9f0f5c62001-12-21 14:45:46 +1100274 sHostbasedUsesNameFromPacketOnly, sClientAliveInterval,
Ben Lindstrombfb3a0e2001-06-05 20:25:05 +0000275 sClientAliveCountMax, sAuthorizedKeysFile, sAuthorizedKeysFile2,
Damien Millerd27b9472005-12-13 19:29:02 +1100276 sGssAuthentication, sGssCleanupCreds, sAcceptEnv, sPermitTunnel,
Ben Lindstromc7431342002-03-22 03:11:49 +0000277 sUsePrivilegeSeparation,
Damien Millerf9b3feb2003-05-16 11:38:32 +1000278 sDeprecated, sUnsupported
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000279} ServerOpCodes;
280
281/* Textual representation of the tokens. */
Damien Miller95def091999-11-25 00:26:21 +1100282static struct {
283 const char *name;
284 ServerOpCodes opcode;
285} keywords[] = {
Damien Miller726273e2001-11-12 11:40:11 +1100286 /* Portable-specific options */
Damien Miller6ac2c482003-05-16 11:42:35 +1000287#ifdef USE_PAM
Damien Miller30912f72003-08-26 10:48:14 +1000288 { "usepam", sUsePAM },
Damien Miller6ac2c482003-05-16 11:42:35 +1000289#else
Damien Miller30912f72003-08-26 10:48:14 +1000290 { "usepam", sUnsupported },
Damien Miller6ac2c482003-05-16 11:42:35 +1000291#endif
Damien Miller30912f72003-08-26 10:48:14 +1000292 { "pamauthenticationviakbdint", sDeprecated },
Damien Miller726273e2001-11-12 11:40:11 +1100293 /* Standard Options */
Damien Miller95def091999-11-25 00:26:21 +1100294 { "port", sPort },
295 { "hostkey", sHostKeyFile },
Damien Miller0bc1bd82000-11-13 22:57:25 +1100296 { "hostdsakey", sHostKeyFile }, /* alias */
Kevin Stevesef4eea92001-02-05 12:42:17 +0000297 { "pidfile", sPidFile },
Damien Miller95def091999-11-25 00:26:21 +1100298 { "serverkeybits", sServerKeyBits },
299 { "logingracetime", sLoginGraceTime },
300 { "keyregenerationinterval", sKeyRegenerationTime },
301 { "permitrootlogin", sPermitRootLogin },
302 { "syslogfacility", sLogFacility },
303 { "loglevel", sLogLevel },
Darren Tuckerec960f22003-08-13 20:37:05 +1000304 { "rhostsauthentication", sDeprecated },
Damien Miller95def091999-11-25 00:26:21 +1100305 { "rhostsrsaauthentication", sRhostsRSAAuthentication },
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000306 { "hostbasedauthentication", sHostbasedAuthentication },
307 { "hostbasedusesnamefrompacketonly", sHostbasedUsesNameFromPacketOnly },
Damien Miller95def091999-11-25 00:26:21 +1100308 { "rsaauthentication", sRSAAuthentication },
Damien Miller0bc1bd82000-11-13 22:57:25 +1100309 { "pubkeyauthentication", sPubkeyAuthentication },
310 { "dsaauthentication", sPubkeyAuthentication }, /* alias */
Darren Tucker6aaa58c2003-08-02 22:24:49 +1000311#ifdef KRB5
Damien Miller95def091999-11-25 00:26:21 +1100312 { "kerberosauthentication", sKerberosAuthentication },
313 { "kerberosorlocalpasswd", sKerberosOrLocalPasswd },
314 { "kerberosticketcleanup", sKerberosTicketCleanup },
Darren Tucker3c78c5e2004-01-23 22:03:10 +1100315#ifdef USE_AFS
Darren Tucker22ef5082003-12-31 11:37:34 +1100316 { "kerberosgetafstoken", sKerberosGetAFSToken },
Damien Millerf9b3feb2003-05-16 11:38:32 +1000317#else
Darren Tucker409cb322004-01-05 22:36:51 +1100318 { "kerberosgetafstoken", sUnsupported },
319#endif
320#else
Damien Millerf9b3feb2003-05-16 11:38:32 +1000321 { "kerberosauthentication", sUnsupported },
322 { "kerberosorlocalpasswd", sUnsupported },
323 { "kerberosticketcleanup", sUnsupported },
Darren Tucker22ef5082003-12-31 11:37:34 +1100324 { "kerberosgetafstoken", sUnsupported },
Damien Millerf9b3feb2003-05-16 11:38:32 +1000325#endif
Damien Miller1a0c0b92003-09-02 22:51:17 +1000326 { "kerberostgtpassing", sUnsupported },
Damien Millerf9b3feb2003-05-16 11:38:32 +1000327 { "afstokenpassing", sUnsupported },
Darren Tucker0efd1552003-08-26 11:49:55 +1000328#ifdef GSSAPI
329 { "gssapiauthentication", sGssAuthentication },
Darren Tuckera49d36e2003-10-02 16:20:54 +1000330 { "gssapicleanupcredentials", sGssCleanupCreds },
Darren Tucker0efd1552003-08-26 11:49:55 +1000331#else
332 { "gssapiauthentication", sUnsupported },
Darren Tuckera49d36e2003-10-02 16:20:54 +1000333 { "gssapicleanupcredentials", sUnsupported },
Darren Tucker0efd1552003-08-26 11:49:55 +1000334#endif
Damien Miller95def091999-11-25 00:26:21 +1100335 { "passwordauthentication", sPasswordAuthentication },
Damien Miller874d77b2000-10-14 16:23:11 +1100336 { "kbdinteractiveauthentication", sKbdInteractiveAuthentication },
Ben Lindstrom95fb2dd2001-01-23 03:12:10 +0000337 { "challengeresponseauthentication", sChallengeResponseAuthentication },
338 { "skeyauthentication", sChallengeResponseAuthentication }, /* alias */
Ben Lindstrom91e98682001-09-12 16:32:14 +0000339 { "checkmail", sDeprecated },
Damien Miller95def091999-11-25 00:26:21 +1100340 { "listenaddress", sListenAddress },
Darren Tucker0f383232005-01-20 10:57:56 +1100341 { "addressfamily", sAddressFamily },
Damien Miller95def091999-11-25 00:26:21 +1100342 { "printmotd", sPrintMotd },
Ben Lindstrom7bfff362001-03-26 05:45:53 +0000343 { "printlastlog", sPrintLastLog },
Damien Miller95def091999-11-25 00:26:21 +1100344 { "ignorerhosts", sIgnoreRhosts },
345 { "ignoreuserknownhosts", sIgnoreUserKnownHosts },
346 { "x11forwarding", sX11Forwarding },
347 { "x11displayoffset", sX11DisplayOffset },
Damien Miller95c249f2002-02-05 12:11:34 +1100348 { "x11uselocalhost", sX11UseLocalhost },
Damien Millerd3a18572000-06-07 19:55:44 +1000349 { "xauthlocation", sXAuthLocation },
Damien Miller95def091999-11-25 00:26:21 +1100350 { "strictmodes", sStrictModes },
351 { "permitemptypasswords", sEmptyPasswd },
Ben Lindstrom5d860f02002-08-01 01:28:38 +0000352 { "permituserenvironment", sPermitUserEnvironment },
Damien Miller95def091999-11-25 00:26:21 +1100353 { "uselogin", sUseLogin },
Ben Lindstrom23e0f662002-06-21 01:09:47 +0000354 { "compression", sCompression },
Damien Miller12c150e2003-12-17 16:31:10 +1100355 { "tcpkeepalive", sTCPKeepAlive },
356 { "keepalive", sTCPKeepAlive }, /* obsolete alias */
Damien Miller50a41ed2000-10-16 12:14:42 +1100357 { "allowtcpforwarding", sAllowTcpForwarding },
Damien Miller95def091999-11-25 00:26:21 +1100358 { "allowusers", sAllowUsers },
359 { "denyusers", sDenyUsers },
360 { "allowgroups", sAllowGroups },
361 { "denygroups", sDenyGroups },
Damien Miller78928792000-04-12 20:17:38 +1000362 { "ciphers", sCiphers },
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000363 { "macs", sMacs },
Damien Miller78928792000-04-12 20:17:38 +1000364 { "protocol", sProtocol },
Damien Millere247cc42000-05-07 12:03:14 +1000365 { "gatewayports", sGatewayPorts },
Damien Millerf6d9e222000-06-18 14:50:44 +1000366 { "subsystem", sSubsystem },
Damien Miller37023962000-07-11 17:31:38 +1000367 { "maxstartups", sMaxStartups },
Darren Tucker89413db2004-05-24 10:36:23 +1000368 { "maxauthtries", sMaxAuthTries },
Ben Lindstrom48bd7c12001-01-09 00:35:42 +0000369 { "banner", sBanner },
Damien Miller3a961dc2003-06-03 10:25:48 +1000370 { "usedns", sUseDNS },
371 { "verifyreversemapping", sDeprecated },
372 { "reversemappingcheck", sDeprecated },
Ben Lindstrom5744dc42001-04-13 23:28:01 +0000373 { "clientaliveinterval", sClientAliveInterval },
374 { "clientalivecountmax", sClientAliveCountMax },
Ben Lindstrombfb3a0e2001-06-05 20:25:05 +0000375 { "authorizedkeysfile", sAuthorizedKeysFile },
376 { "authorizedkeysfile2", sAuthorizedKeysFile2 },
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000377 { "useprivilegeseparation", sUsePrivilegeSeparation},
Darren Tucker46bc0752004-05-02 22:11:30 +1000378 { "acceptenv", sAcceptEnv },
Damien Millerd27b9472005-12-13 19:29:02 +1100379 { "permittunnel", sPermitTunnel },
Ben Lindstrom65366a82001-12-06 16:32:47 +0000380 { NULL, sBadOption }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000381};
382
Damien Miller5428f641999-11-25 11:54:57 +1100383/*
Ben Lindstrom3704c262001-04-02 18:20:03 +0000384 * Returns the number of the token pointed to by cp or sBadOption.
Damien Miller5428f641999-11-25 11:54:57 +1100385 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000386
Damien Miller4af51302000-04-16 11:18:38 +1000387static ServerOpCodes
Damien Miller95def091999-11-25 00:26:21 +1100388parse_token(const char *cp, const char *filename,
389 int linenum)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000390{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000391 u_int i;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000392
Damien Miller95def091999-11-25 00:26:21 +1100393 for (i = 0; keywords[i].name; i++)
Damien Miller5428f641999-11-25 11:54:57 +1100394 if (strcasecmp(cp, keywords[i].name) == 0)
Damien Miller95def091999-11-25 00:26:21 +1100395 return keywords[i].opcode;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000396
Ben Lindstromb5cdc662001-04-16 02:13:26 +0000397 error("%s: line %d: Bad configuration option: %s",
398 filename, linenum, cp);
Damien Miller95def091999-11-25 00:26:21 +1100399 return sBadOption;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000400}
401
Ben Lindstrombba81212001-06-25 05:01:22 +0000402static void
Ben Lindstrom19066a12001-04-12 23:39:26 +0000403add_listen_addr(ServerOptions *options, char *addr, u_short port)
Damien Miller34132e52000-01-14 15:45:46 +1100404{
Damien Millereccb9de2005-06-17 12:59:34 +1000405 u_int i;
Damien Miller34132e52000-01-14 15:45:46 +1100406
407 if (options->num_ports == 0)
408 options->ports[options->num_ports++] = SSH_DEFAULT_PORT;
Darren Tucker0f383232005-01-20 10:57:56 +1100409 if (options->address_family == -1)
410 options->address_family = AF_UNSPEC;
Ben Lindstrom19066a12001-04-12 23:39:26 +0000411 if (port == 0)
Ben Lindstromc510af42001-04-07 17:25:48 +0000412 for (i = 0; i < options->num_ports; i++)
413 add_one_listen_addr(options, addr, options->ports[i]);
414 else
Ben Lindstrom19066a12001-04-12 23:39:26 +0000415 add_one_listen_addr(options, addr, port);
Ben Lindstromc510af42001-04-07 17:25:48 +0000416}
417
Ben Lindstrombba81212001-06-25 05:01:22 +0000418static void
Ben Lindstromc510af42001-04-07 17:25:48 +0000419add_one_listen_addr(ServerOptions *options, char *addr, u_short port)
420{
421 struct addrinfo hints, *ai, *aitop;
422 char strport[NI_MAXSERV];
423 int gaierr;
424
425 memset(&hints, 0, sizeof(hints));
Darren Tucker0f383232005-01-20 10:57:56 +1100426 hints.ai_family = options->address_family;
Ben Lindstromc510af42001-04-07 17:25:48 +0000427 hints.ai_socktype = SOCK_STREAM;
428 hints.ai_flags = (addr == NULL) ? AI_PASSIVE : 0;
Ben Lindstrome1353632002-06-23 21:29:23 +0000429 snprintf(strport, sizeof strport, "%u", port);
Ben Lindstromc510af42001-04-07 17:25:48 +0000430 if ((gaierr = getaddrinfo(addr, strport, &hints, &aitop)) != 0)
431 fatal("bad addr or host: %s (%s)",
432 addr ? addr : "<NULL>",
433 gai_strerror(gaierr));
434 for (ai = aitop; ai->ai_next; ai = ai->ai_next)
435 ;
436 ai->ai_next = options->listen_addrs;
437 options->listen_addrs = aitop;
Damien Miller34132e52000-01-14 15:45:46 +1100438}
439
Ben Lindstromade03f62001-12-06 18:22:17 +0000440int
441process_server_config_line(ServerOptions *options, char *line,
442 const char *filename, int linenum)
443{
444 char *cp, **charptr, *arg, *p;
Damien Millereccb9de2005-06-17 12:59:34 +1000445 int *intptr, value, n;
Ben Lindstromade03f62001-12-06 18:22:17 +0000446 ServerOpCodes opcode;
Damien Millerf91ee4c2005-03-01 21:24:33 +1100447 u_short port;
Damien Millereccb9de2005-06-17 12:59:34 +1000448 u_int i;
Ben Lindstromade03f62001-12-06 18:22:17 +0000449
450 cp = line;
451 arg = strdelim(&cp);
452 /* Ignore leading whitespace */
453 if (*arg == '\0')
454 arg = strdelim(&cp);
455 if (!arg || !*arg || *arg == '#')
456 return 0;
457 intptr = NULL;
458 charptr = NULL;
459 opcode = parse_token(arg, filename, linenum);
460 switch (opcode) {
461 /* Portable-specific options */
Damien Miller4e448a32003-05-14 15:11:48 +1000462 case sUsePAM:
463 intptr = &options->use_pam;
Ben Lindstromade03f62001-12-06 18:22:17 +0000464 goto parse_flag;
465
466 /* Standard Options */
467 case sBadOption:
468 return -1;
469 case sPort:
470 /* ignore ports from configfile if cmdline specifies ports */
471 if (options->ports_from_cmdline)
472 return 0;
473 if (options->listen_addrs != NULL)
474 fatal("%s line %d: ports must be specified before "
Damien Miller4fbf08a2002-01-22 23:35:09 +1100475 "ListenAddress.", filename, linenum);
Ben Lindstromade03f62001-12-06 18:22:17 +0000476 if (options->num_ports >= MAX_PORTS)
477 fatal("%s line %d: too many ports.",
478 filename, linenum);
479 arg = strdelim(&cp);
480 if (!arg || *arg == '\0')
481 fatal("%s line %d: missing port number.",
482 filename, linenum);
483 options->ports[options->num_ports++] = a2port(arg);
484 if (options->ports[options->num_ports-1] == 0)
485 fatal("%s line %d: Badly formatted port number.",
486 filename, linenum);
487 break;
488
489 case sServerKeyBits:
490 intptr = &options->server_key_bits;
491parse_int:
492 arg = strdelim(&cp);
493 if (!arg || *arg == '\0')
494 fatal("%s line %d: missing integer value.",
495 filename, linenum);
496 value = atoi(arg);
497 if (*intptr == -1)
498 *intptr = value;
499 break;
500
501 case sLoginGraceTime:
502 intptr = &options->login_grace_time;
503parse_time:
504 arg = strdelim(&cp);
505 if (!arg || *arg == '\0')
506 fatal("%s line %d: missing time value.",
507 filename, linenum);
508 if ((value = convtime(arg)) == -1)
509 fatal("%s line %d: invalid time value.",
510 filename, linenum);
511 if (*intptr == -1)
512 *intptr = value;
513 break;
514
515 case sKeyRegenerationTime:
516 intptr = &options->key_regeneration_time;
517 goto parse_time;
518
519 case sListenAddress:
520 arg = strdelim(&cp);
Damien Millerf91ee4c2005-03-01 21:24:33 +1100521 if (arg == NULL || *arg == '\0')
522 fatal("%s line %d: missing address",
Ben Lindstromade03f62001-12-06 18:22:17 +0000523 filename, linenum);
Damien Miller203c7052005-08-12 22:11:37 +1000524 /* check for bare IPv6 address: no "[]" and 2 or more ":" */
525 if (strchr(arg, '[') == NULL && (p = strchr(arg, ':')) != NULL
526 && strchr(p+1, ':') != NULL) {
527 add_listen_addr(options, arg, 0);
528 break;
529 }
Damien Millerf91ee4c2005-03-01 21:24:33 +1100530 p = hpdelim(&arg);
531 if (p == NULL)
532 fatal("%s line %d: bad address:port usage",
533 filename, linenum);
534 p = cleanhostname(p);
535 if (arg == NULL)
536 port = 0;
537 else if ((port = a2port(arg)) == 0)
538 fatal("%s line %d: bad port number", filename, linenum);
Ben Lindstromade03f62001-12-06 18:22:17 +0000539
Damien Millerf91ee4c2005-03-01 21:24:33 +1100540 add_listen_addr(options, p, port);
541
Ben Lindstromade03f62001-12-06 18:22:17 +0000542 break;
543
Darren Tucker0f383232005-01-20 10:57:56 +1100544 case sAddressFamily:
545 arg = strdelim(&cp);
Damien Miller17b23d82005-05-26 12:11:56 +1000546 if (!arg || *arg == '\0')
547 fatal("%s line %d: missing address family.",
548 filename, linenum);
Darren Tucker0f383232005-01-20 10:57:56 +1100549 intptr = &options->address_family;
550 if (options->listen_addrs != NULL)
551 fatal("%s line %d: address family must be specified before "
552 "ListenAddress.", filename, linenum);
553 if (strcasecmp(arg, "inet") == 0)
554 value = AF_INET;
555 else if (strcasecmp(arg, "inet6") == 0)
556 value = AF_INET6;
557 else if (strcasecmp(arg, "any") == 0)
558 value = AF_UNSPEC;
559 else
560 fatal("%s line %d: unsupported address family \"%s\".",
561 filename, linenum, arg);
562 if (*intptr == -1)
563 *intptr = value;
564 break;
565
Ben Lindstromade03f62001-12-06 18:22:17 +0000566 case sHostKeyFile:
567 intptr = &options->num_host_key_files;
568 if (*intptr >= MAX_HOSTKEYS)
569 fatal("%s line %d: too many host keys specified (max %d).",
570 filename, linenum, MAX_HOSTKEYS);
571 charptr = &options->host_key_files[*intptr];
572parse_filename:
573 arg = strdelim(&cp);
574 if (!arg || *arg == '\0')
575 fatal("%s line %d: missing file name.",
576 filename, linenum);
577 if (*charptr == NULL) {
578 *charptr = tilde_expand_filename(arg, getuid());
579 /* increase optional counter */
580 if (intptr != NULL)
581 *intptr = *intptr + 1;
582 }
583 break;
584
585 case sPidFile:
586 charptr = &options->pid_file;
587 goto parse_filename;
588
589 case sPermitRootLogin:
590 intptr = &options->permit_root_login;
591 arg = strdelim(&cp);
592 if (!arg || *arg == '\0')
593 fatal("%s line %d: missing yes/"
594 "without-password/forced-commands-only/no "
595 "argument.", filename, linenum);
596 value = 0; /* silence compiler */
597 if (strcmp(arg, "without-password") == 0)
598 value = PERMIT_NO_PASSWD;
599 else if (strcmp(arg, "forced-commands-only") == 0)
600 value = PERMIT_FORCED_ONLY;
601 else if (strcmp(arg, "yes") == 0)
602 value = PERMIT_YES;
603 else if (strcmp(arg, "no") == 0)
604 value = PERMIT_NO;
605 else
606 fatal("%s line %d: Bad yes/"
607 "without-password/forced-commands-only/no "
608 "argument: %s", filename, linenum, arg);
609 if (*intptr == -1)
610 *intptr = value;
611 break;
612
613 case sIgnoreRhosts:
614 intptr = &options->ignore_rhosts;
615parse_flag:
616 arg = strdelim(&cp);
617 if (!arg || *arg == '\0')
618 fatal("%s line %d: missing yes/no argument.",
619 filename, linenum);
620 value = 0; /* silence compiler */
621 if (strcmp(arg, "yes") == 0)
622 value = 1;
623 else if (strcmp(arg, "no") == 0)
624 value = 0;
625 else
626 fatal("%s line %d: Bad yes/no argument: %s",
627 filename, linenum, arg);
628 if (*intptr == -1)
629 *intptr = value;
630 break;
631
632 case sIgnoreUserKnownHosts:
633 intptr = &options->ignore_user_known_hosts;
634 goto parse_flag;
635
Ben Lindstromade03f62001-12-06 18:22:17 +0000636 case sRhostsRSAAuthentication:
637 intptr = &options->rhosts_rsa_authentication;
638 goto parse_flag;
639
640 case sHostbasedAuthentication:
641 intptr = &options->hostbased_authentication;
642 goto parse_flag;
643
644 case sHostbasedUsesNameFromPacketOnly:
645 intptr = &options->hostbased_uses_name_from_packet_only;
646 goto parse_flag;
647
648 case sRSAAuthentication:
649 intptr = &options->rsa_authentication;
650 goto parse_flag;
651
652 case sPubkeyAuthentication:
653 intptr = &options->pubkey_authentication;
654 goto parse_flag;
Damien Miller2aa0ab42003-05-15 12:05:28 +1000655
Ben Lindstromade03f62001-12-06 18:22:17 +0000656 case sKerberosAuthentication:
657 intptr = &options->kerberos_authentication;
658 goto parse_flag;
659
660 case sKerberosOrLocalPasswd:
661 intptr = &options->kerberos_or_local_passwd;
662 goto parse_flag;
663
664 case sKerberosTicketCleanup:
665 intptr = &options->kerberos_ticket_cleanup;
666 goto parse_flag;
Damien Miller2aa0ab42003-05-15 12:05:28 +1000667
Darren Tucker22ef5082003-12-31 11:37:34 +1100668 case sKerberosGetAFSToken:
669 intptr = &options->kerberos_get_afs_token;
670 goto parse_flag;
671
Darren Tucker0efd1552003-08-26 11:49:55 +1000672 case sGssAuthentication:
673 intptr = &options->gss_authentication;
674 goto parse_flag;
675
676 case sGssCleanupCreds:
677 intptr = &options->gss_cleanup_creds;
678 goto parse_flag;
679
Ben Lindstromade03f62001-12-06 18:22:17 +0000680 case sPasswordAuthentication:
681 intptr = &options->password_authentication;
682 goto parse_flag;
683
684 case sKbdInteractiveAuthentication:
685 intptr = &options->kbd_interactive_authentication;
686 goto parse_flag;
687
688 case sChallengeResponseAuthentication:
689 intptr = &options->challenge_response_authentication;
690 goto parse_flag;
691
692 case sPrintMotd:
693 intptr = &options->print_motd;
694 goto parse_flag;
695
696 case sPrintLastLog:
697 intptr = &options->print_lastlog;
698 goto parse_flag;
699
700 case sX11Forwarding:
701 intptr = &options->x11_forwarding;
702 goto parse_flag;
703
704 case sX11DisplayOffset:
705 intptr = &options->x11_display_offset;
706 goto parse_int;
707
Damien Miller95c249f2002-02-05 12:11:34 +1100708 case sX11UseLocalhost:
709 intptr = &options->x11_use_localhost;
710 goto parse_flag;
711
Ben Lindstromade03f62001-12-06 18:22:17 +0000712 case sXAuthLocation:
713 charptr = &options->xauth_location;
714 goto parse_filename;
715
716 case sStrictModes:
717 intptr = &options->strict_modes;
718 goto parse_flag;
719
Damien Miller12c150e2003-12-17 16:31:10 +1100720 case sTCPKeepAlive:
721 intptr = &options->tcp_keep_alive;
Ben Lindstromade03f62001-12-06 18:22:17 +0000722 goto parse_flag;
723
724 case sEmptyPasswd:
725 intptr = &options->permit_empty_passwd;
726 goto parse_flag;
727
Ben Lindstrom5d860f02002-08-01 01:28:38 +0000728 case sPermitUserEnvironment:
729 intptr = &options->permit_user_env;
730 goto parse_flag;
731
Ben Lindstromade03f62001-12-06 18:22:17 +0000732 case sUseLogin:
733 intptr = &options->use_login;
734 goto parse_flag;
735
Ben Lindstrom23e0f662002-06-21 01:09:47 +0000736 case sCompression:
737 intptr = &options->compression;
Damien Miller9786e6e2005-07-26 21:54:56 +1000738 arg = strdelim(&cp);
739 if (!arg || *arg == '\0')
740 fatal("%s line %d: missing yes/no/delayed "
741 "argument.", filename, linenum);
742 value = 0; /* silence compiler */
743 if (strcmp(arg, "delayed") == 0)
744 value = COMP_DELAYED;
745 else if (strcmp(arg, "yes") == 0)
746 value = COMP_ZLIB;
747 else if (strcmp(arg, "no") == 0)
748 value = COMP_NONE;
749 else
750 fatal("%s line %d: Bad yes/no/delayed "
751 "argument: %s", filename, linenum, arg);
752 if (*intptr == -1)
753 *intptr = value;
754 break;
Ben Lindstrom23e0f662002-06-21 01:09:47 +0000755
Ben Lindstromade03f62001-12-06 18:22:17 +0000756 case sGatewayPorts:
757 intptr = &options->gateway_ports;
Damien Millerf91ee4c2005-03-01 21:24:33 +1100758 arg = strdelim(&cp);
759 if (!arg || *arg == '\0')
760 fatal("%s line %d: missing yes/no/clientspecified "
761 "argument.", filename, linenum);
762 value = 0; /* silence compiler */
763 if (strcmp(arg, "clientspecified") == 0)
764 value = 2;
765 else if (strcmp(arg, "yes") == 0)
766 value = 1;
767 else if (strcmp(arg, "no") == 0)
768 value = 0;
769 else
770 fatal("%s line %d: Bad yes/no/clientspecified "
771 "argument: %s", filename, linenum, arg);
772 if (*intptr == -1)
773 *intptr = value;
774 break;
Ben Lindstromade03f62001-12-06 18:22:17 +0000775
Damien Miller3a961dc2003-06-03 10:25:48 +1000776 case sUseDNS:
777 intptr = &options->use_dns;
Ben Lindstromade03f62001-12-06 18:22:17 +0000778 goto parse_flag;
779
780 case sLogFacility:
781 intptr = (int *) &options->log_facility;
782 arg = strdelim(&cp);
783 value = log_facility_number(arg);
Damien Millerfcd93202002-02-05 12:26:34 +1100784 if (value == SYSLOG_FACILITY_NOT_SET)
Ben Lindstromade03f62001-12-06 18:22:17 +0000785 fatal("%.200s line %d: unsupported log facility '%s'",
786 filename, linenum, arg ? arg : "<NONE>");
787 if (*intptr == -1)
788 *intptr = (SyslogFacility) value;
789 break;
790
791 case sLogLevel:
792 intptr = (int *) &options->log_level;
793 arg = strdelim(&cp);
794 value = log_level_number(arg);
Damien Millerfcd93202002-02-05 12:26:34 +1100795 if (value == SYSLOG_LEVEL_NOT_SET)
Ben Lindstromade03f62001-12-06 18:22:17 +0000796 fatal("%.200s line %d: unsupported log level '%s'",
797 filename, linenum, arg ? arg : "<NONE>");
798 if (*intptr == -1)
799 *intptr = (LogLevel) value;
800 break;
801
802 case sAllowTcpForwarding:
803 intptr = &options->allow_tcp_forwarding;
804 goto parse_flag;
805
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000806 case sUsePrivilegeSeparation:
807 intptr = &use_privsep;
808 goto parse_flag;
809
Ben Lindstromade03f62001-12-06 18:22:17 +0000810 case sAllowUsers:
811 while ((arg = strdelim(&cp)) && *arg != '\0') {
812 if (options->num_allow_users >= MAX_ALLOW_USERS)
813 fatal("%s line %d: too many allow users.",
814 filename, linenum);
Ben Lindstrome1353632002-06-23 21:29:23 +0000815 options->allow_users[options->num_allow_users++] =
816 xstrdup(arg);
Ben Lindstromade03f62001-12-06 18:22:17 +0000817 }
818 break;
819
820 case sDenyUsers:
821 while ((arg = strdelim(&cp)) && *arg != '\0') {
822 if (options->num_deny_users >= MAX_DENY_USERS)
823 fatal( "%s line %d: too many deny users.",
824 filename, linenum);
Ben Lindstrome1353632002-06-23 21:29:23 +0000825 options->deny_users[options->num_deny_users++] =
826 xstrdup(arg);
Ben Lindstromade03f62001-12-06 18:22:17 +0000827 }
828 break;
829
830 case sAllowGroups:
831 while ((arg = strdelim(&cp)) && *arg != '\0') {
832 if (options->num_allow_groups >= MAX_ALLOW_GROUPS)
833 fatal("%s line %d: too many allow groups.",
834 filename, linenum);
Ben Lindstrome1353632002-06-23 21:29:23 +0000835 options->allow_groups[options->num_allow_groups++] =
836 xstrdup(arg);
Ben Lindstromade03f62001-12-06 18:22:17 +0000837 }
838 break;
839
840 case sDenyGroups:
841 while ((arg = strdelim(&cp)) && *arg != '\0') {
842 if (options->num_deny_groups >= MAX_DENY_GROUPS)
843 fatal("%s line %d: too many deny groups.",
844 filename, linenum);
845 options->deny_groups[options->num_deny_groups++] = xstrdup(arg);
846 }
847 break;
848
849 case sCiphers:
850 arg = strdelim(&cp);
851 if (!arg || *arg == '\0')
852 fatal("%s line %d: Missing argument.", filename, linenum);
853 if (!ciphers_valid(arg))
854 fatal("%s line %d: Bad SSH2 cipher spec '%s'.",
855 filename, linenum, arg ? arg : "<NONE>");
856 if (options->ciphers == NULL)
857 options->ciphers = xstrdup(arg);
858 break;
859
860 case sMacs:
861 arg = strdelim(&cp);
862 if (!arg || *arg == '\0')
863 fatal("%s line %d: Missing argument.", filename, linenum);
864 if (!mac_valid(arg))
865 fatal("%s line %d: Bad SSH2 mac spec '%s'.",
866 filename, linenum, arg ? arg : "<NONE>");
867 if (options->macs == NULL)
868 options->macs = xstrdup(arg);
869 break;
870
871 case sProtocol:
872 intptr = &options->protocol;
873 arg = strdelim(&cp);
874 if (!arg || *arg == '\0')
875 fatal("%s line %d: Missing argument.", filename, linenum);
876 value = proto_spec(arg);
877 if (value == SSH_PROTO_UNKNOWN)
878 fatal("%s line %d: Bad protocol spec '%s'.",
Damien Miller9f0f5c62001-12-21 14:45:46 +1100879 filename, linenum, arg ? arg : "<NONE>");
Ben Lindstromade03f62001-12-06 18:22:17 +0000880 if (*intptr == SSH_PROTO_UNKNOWN)
881 *intptr = value;
882 break;
883
884 case sSubsystem:
885 if (options->num_subsystems >= MAX_SUBSYSTEMS) {
886 fatal("%s line %d: too many subsystems defined.",
Damien Miller9f0f5c62001-12-21 14:45:46 +1100887 filename, linenum);
Ben Lindstromade03f62001-12-06 18:22:17 +0000888 }
889 arg = strdelim(&cp);
890 if (!arg || *arg == '\0')
891 fatal("%s line %d: Missing subsystem name.",
Damien Miller9f0f5c62001-12-21 14:45:46 +1100892 filename, linenum);
Ben Lindstromade03f62001-12-06 18:22:17 +0000893 for (i = 0; i < options->num_subsystems; i++)
894 if (strcmp(arg, options->subsystem_name[i]) == 0)
895 fatal("%s line %d: Subsystem '%s' already defined.",
Damien Miller9f0f5c62001-12-21 14:45:46 +1100896 filename, linenum, arg);
Ben Lindstromade03f62001-12-06 18:22:17 +0000897 options->subsystem_name[options->num_subsystems] = xstrdup(arg);
898 arg = strdelim(&cp);
899 if (!arg || *arg == '\0')
900 fatal("%s line %d: Missing subsystem command.",
Damien Miller9f0f5c62001-12-21 14:45:46 +1100901 filename, linenum);
Ben Lindstromade03f62001-12-06 18:22:17 +0000902 options->subsystem_command[options->num_subsystems] = xstrdup(arg);
903 options->num_subsystems++;
904 break;
905
906 case sMaxStartups:
907 arg = strdelim(&cp);
908 if (!arg || *arg == '\0')
909 fatal("%s line %d: Missing MaxStartups spec.",
Damien Miller9f0f5c62001-12-21 14:45:46 +1100910 filename, linenum);
Ben Lindstromade03f62001-12-06 18:22:17 +0000911 if ((n = sscanf(arg, "%d:%d:%d",
912 &options->max_startups_begin,
913 &options->max_startups_rate,
914 &options->max_startups)) == 3) {
915 if (options->max_startups_begin >
916 options->max_startups ||
917 options->max_startups_rate > 100 ||
918 options->max_startups_rate < 1)
919 fatal("%s line %d: Illegal MaxStartups spec.",
920 filename, linenum);
921 } else if (n != 1)
922 fatal("%s line %d: Illegal MaxStartups spec.",
923 filename, linenum);
924 else
925 options->max_startups = options->max_startups_begin;
926 break;
927
Darren Tucker89413db2004-05-24 10:36:23 +1000928 case sMaxAuthTries:
929 intptr = &options->max_authtries;
930 goto parse_int;
931
Ben Lindstromade03f62001-12-06 18:22:17 +0000932 case sBanner:
933 charptr = &options->banner;
934 goto parse_filename;
935 /*
936 * These options can contain %X options expanded at
937 * connect time, so that you can specify paths like:
938 *
939 * AuthorizedKeysFile /etc/ssh_keys/%u
940 */
941 case sAuthorizedKeysFile:
942 case sAuthorizedKeysFile2:
943 charptr = (opcode == sAuthorizedKeysFile ) ?
944 &options->authorized_keys_file :
945 &options->authorized_keys_file2;
946 goto parse_filename;
947
948 case sClientAliveInterval:
949 intptr = &options->client_alive_interval;
950 goto parse_time;
951
952 case sClientAliveCountMax:
953 intptr = &options->client_alive_count_max;
954 goto parse_int;
955
Darren Tucker46bc0752004-05-02 22:11:30 +1000956 case sAcceptEnv:
957 while ((arg = strdelim(&cp)) && *arg != '\0') {
958 if (strchr(arg, '=') != NULL)
959 fatal("%s line %d: Invalid environment name.",
960 filename, linenum);
961 if (options->num_accept_env >= MAX_ACCEPT_ENV)
962 fatal("%s line %d: too many allow env.",
963 filename, linenum);
964 options->accept_env[options->num_accept_env++] =
965 xstrdup(arg);
966 }
967 break;
968
Damien Millerd27b9472005-12-13 19:29:02 +1100969 case sPermitTunnel:
970 intptr = &options->permit_tun;
Damien Miller7b58e802005-12-13 19:33:19 +1100971 arg = strdelim(&cp);
972 if (!arg || *arg == '\0')
973 fatal("%s line %d: Missing yes/point-to-point/"
974 "ethernet/no argument.", filename, linenum);
975 value = 0; /* silence compiler */
976 if (strcasecmp(arg, "ethernet") == 0)
977 value = SSH_TUNMODE_ETHERNET;
978 else if (strcasecmp(arg, "point-to-point") == 0)
979 value = SSH_TUNMODE_POINTOPOINT;
980 else if (strcasecmp(arg, "yes") == 0)
981 value = SSH_TUNMODE_YES;
982 else if (strcasecmp(arg, "no") == 0)
983 value = SSH_TUNMODE_NO;
984 else
985 fatal("%s line %d: Bad yes/point-to-point/ethernet/"
986 "no argument: %s", filename, linenum, arg);
987 if (*intptr == -1)
988 *intptr = value;
989 break;
Damien Millerd27b9472005-12-13 19:29:02 +1100990
Ben Lindstromade03f62001-12-06 18:22:17 +0000991 case sDeprecated:
Damien Miller996acd22003-04-09 20:59:48 +1000992 logit("%s line %d: Deprecated option %s",
Ben Lindstromade03f62001-12-06 18:22:17 +0000993 filename, linenum, arg);
994 while (arg)
995 arg = strdelim(&cp);
996 break;
997
Damien Millerf9b3feb2003-05-16 11:38:32 +1000998 case sUnsupported:
999 logit("%s line %d: Unsupported option %s",
1000 filename, linenum, arg);
1001 while (arg)
1002 arg = strdelim(&cp);
1003 break;
1004
Ben Lindstromade03f62001-12-06 18:22:17 +00001005 default:
1006 fatal("%s line %d: Missing handler for opcode %s (%d)",
1007 filename, linenum, arg, opcode);
1008 }
1009 if ((arg = strdelim(&cp)) != NULL && *arg != '\0')
1010 fatal("%s line %d: garbage at end of line; \"%.200s\".",
1011 filename, linenum, arg);
1012 return 0;
1013}
1014
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001015/* Reads the server configuration file. */
1016
Damien Miller4af51302000-04-16 11:18:38 +10001017void
Darren Tucker645ab752004-06-25 13:33:20 +10001018load_server_config(const char *filename, Buffer *conf)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001019{
Darren Tucker645ab752004-06-25 13:33:20 +10001020 char line[1024], *cp;
Ben Lindstrome1353632002-06-23 21:29:23 +00001021 FILE *f;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001022
Darren Tucker645ab752004-06-25 13:33:20 +10001023 debug2("%s: filename %s", __func__, filename);
1024 if ((f = fopen(filename, "r")) == NULL) {
Damien Miller95def091999-11-25 00:26:21 +11001025 perror(filename);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001026 exit(1);
Damien Miller95def091999-11-25 00:26:21 +11001027 }
Darren Tucker645ab752004-06-25 13:33:20 +10001028 buffer_clear(conf);
Damien Miller95def091999-11-25 00:26:21 +11001029 while (fgets(line, sizeof(line), f)) {
Darren Tucker645ab752004-06-25 13:33:20 +10001030 /*
1031 * Trim out comments and strip whitespace
Darren Tuckerfc959702004-07-17 16:12:08 +10001032 * NB - preserve newlines, they are needed to reproduce
Darren Tucker645ab752004-06-25 13:33:20 +10001033 * line numbers later for error messages
1034 */
1035 if ((cp = strchr(line, '#')) != NULL)
1036 memcpy(cp, "\n", 2);
1037 cp = line + strspn(line, " \t\r");
1038
1039 buffer_append(conf, cp, strlen(cp));
1040 }
1041 buffer_append(conf, "\0", 1);
1042 fclose(f);
1043 debug2("%s: done config len = %d", __func__, buffer_len(conf));
1044}
1045
1046void
1047parse_server_config(ServerOptions *options, const char *filename, Buffer *conf)
1048{
1049 int linenum, bad_options = 0;
Darren Tucker9fbac712004-08-12 22:41:44 +10001050 char *cp, *obuf, *cbuf;
Darren Tucker645ab752004-06-25 13:33:20 +10001051
1052 debug2("%s: config %s len %d", __func__, filename, buffer_len(conf));
1053
Darren Tucker9fbac712004-08-12 22:41:44 +10001054 obuf = cbuf = xstrdup(buffer_ptr(conf));
Darren Tucker137e9c92004-08-13 21:30:24 +10001055 linenum = 1;
Darren Tucker47eede72005-03-14 23:08:12 +11001056 while ((cp = strsep(&cbuf, "\n")) != NULL) {
Darren Tucker645ab752004-06-25 13:33:20 +10001057 if (process_server_config_line(options, cp, filename,
1058 linenum++) != 0)
Damien Miller95def091999-11-25 00:26:21 +11001059 bad_options++;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001060 }
Darren Tucker9fbac712004-08-12 22:41:44 +10001061 xfree(obuf);
Ben Lindstromb5cdc662001-04-16 02:13:26 +00001062 if (bad_options > 0)
1063 fatal("%s: terminating, %d bad configuration options",
1064 filename, bad_options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001065}