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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 Miller203c7052005-08-12 22:11:37 +100013RCSID("$OpenBSD: servconf.c,v 1.144 2005/08/06 10:03:12 dtucker 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;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000104
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000105 /* Needs to be accessable in many places */
106 use_privsep = -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000107}
108
Damien Miller4af51302000-04-16 11:18:38 +1000109void
Damien Miller95def091999-11-25 00:26:21 +1100110fill_default_server_options(ServerOptions *options)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000111{
Damien Miller726273e2001-11-12 11:40:11 +1100112 /* Portable-specific options */
Damien Miller4e448a32003-05-14 15:11:48 +1000113 if (options->use_pam == -1)
Damien Miller5c3a5582003-09-23 22:12:38 +1000114 options->use_pam = 0;
Damien Miller726273e2001-11-12 11:40:11 +1100115
116 /* Standard Options */
Damien Miller0bc1bd82000-11-13 22:57:25 +1100117 if (options->protocol == SSH_PROTO_UNKNOWN)
118 options->protocol = SSH_PROTO_1|SSH_PROTO_2;
119 if (options->num_host_key_files == 0) {
120 /* fill default hostkeys for protocols */
121 if (options->protocol & SSH_PROTO_1)
Damien Miller7fc23732002-01-22 23:19:11 +1100122 options->host_key_files[options->num_host_key_files++] =
123 _PATH_HOST_KEY_FILE;
124 if (options->protocol & SSH_PROTO_2) {
125 options->host_key_files[options->num_host_key_files++] =
126 _PATH_HOST_RSA_KEY_FILE;
127 options->host_key_files[options->num_host_key_files++] =
128 _PATH_HOST_DSA_KEY_FILE;
129 }
Damien Miller0bc1bd82000-11-13 22:57:25 +1100130 }
Damien Miller34132e52000-01-14 15:45:46 +1100131 if (options->num_ports == 0)
132 options->ports[options->num_ports++] = SSH_DEFAULT_PORT;
133 if (options->listen_addrs == NULL)
Ben Lindstrom19066a12001-04-12 23:39:26 +0000134 add_listen_addr(options, NULL, 0);
Damien Miller6f83b8e2000-05-02 09:23:45 +1000135 if (options->pid_file == NULL)
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000136 options->pid_file = _PATH_SSH_DAEMON_PID_FILE;
Damien Miller95def091999-11-25 00:26:21 +1100137 if (options->server_key_bits == -1)
138 options->server_key_bits = 768;
139 if (options->login_grace_time == -1)
Damien Millerc1348632002-09-05 14:35:14 +1000140 options->login_grace_time = 120;
Damien Miller95def091999-11-25 00:26:21 +1100141 if (options->key_regeneration_time == -1)
142 options->key_regeneration_time = 3600;
Ben Lindstromd8a90212001-02-15 03:08:27 +0000143 if (options->permit_root_login == PERMIT_NOT_SET)
144 options->permit_root_login = PERMIT_YES;
Damien Miller95def091999-11-25 00:26:21 +1100145 if (options->ignore_rhosts == -1)
Damien Miller98c7ad62000-03-09 21:27:49 +1100146 options->ignore_rhosts = 1;
Damien Miller95def091999-11-25 00:26:21 +1100147 if (options->ignore_user_known_hosts == -1)
148 options->ignore_user_known_hosts = 0;
Damien Miller95def091999-11-25 00:26:21 +1100149 if (options->print_motd == -1)
150 options->print_motd = 1;
Ben Lindstrom7bfff362001-03-26 05:45:53 +0000151 if (options->print_lastlog == -1)
152 options->print_lastlog = 1;
Damien Miller95def091999-11-25 00:26:21 +1100153 if (options->x11_forwarding == -1)
Damien Miller98c7ad62000-03-09 21:27:49 +1100154 options->x11_forwarding = 0;
Damien Miller95def091999-11-25 00:26:21 +1100155 if (options->x11_display_offset == -1)
Damien Miller98c7ad62000-03-09 21:27:49 +1100156 options->x11_display_offset = 10;
Damien Miller95c249f2002-02-05 12:11:34 +1100157 if (options->x11_use_localhost == -1)
158 options->x11_use_localhost = 1;
Damien Millerd3a18572000-06-07 19:55:44 +1000159 if (options->xauth_location == NULL)
Ben Lindstrom1bf11f62001-06-09 01:48:01 +0000160 options->xauth_location = _PATH_XAUTH;
Damien Miller95def091999-11-25 00:26:21 +1100161 if (options->strict_modes == -1)
162 options->strict_modes = 1;
Damien Miller12c150e2003-12-17 16:31:10 +1100163 if (options->tcp_keep_alive == -1)
164 options->tcp_keep_alive = 1;
Damien Millerfcd93202002-02-05 12:26:34 +1100165 if (options->log_facility == SYSLOG_FACILITY_NOT_SET)
Damien Miller95def091999-11-25 00:26:21 +1100166 options->log_facility = SYSLOG_FACILITY_AUTH;
Damien Millerfcd93202002-02-05 12:26:34 +1100167 if (options->log_level == SYSLOG_LEVEL_NOT_SET)
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000168 options->log_level = SYSLOG_LEVEL_INFO;
Damien Miller95def091999-11-25 00:26:21 +1100169 if (options->rhosts_rsa_authentication == -1)
Damien Miller98c7ad62000-03-09 21:27:49 +1100170 options->rhosts_rsa_authentication = 0;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000171 if (options->hostbased_authentication == -1)
172 options->hostbased_authentication = 0;
173 if (options->hostbased_uses_name_from_packet_only == -1)
174 options->hostbased_uses_name_from_packet_only = 0;
Damien Miller95def091999-11-25 00:26:21 +1100175 if (options->rsa_authentication == -1)
176 options->rsa_authentication = 1;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100177 if (options->pubkey_authentication == -1)
178 options->pubkey_authentication = 1;
Damien Miller95def091999-11-25 00:26:21 +1100179 if (options->kerberos_authentication == -1)
Damien Millerd7de14b2002-04-23 21:04:51 +1000180 options->kerberos_authentication = 0;
Damien Miller95def091999-11-25 00:26:21 +1100181 if (options->kerberos_or_local_passwd == -1)
182 options->kerberos_or_local_passwd = 1;
183 if (options->kerberos_ticket_cleanup == -1)
184 options->kerberos_ticket_cleanup = 1;
Darren Tucker22ef5082003-12-31 11:37:34 +1100185 if (options->kerberos_get_afs_token == -1)
186 options->kerberos_get_afs_token = 0;
Darren Tucker0efd1552003-08-26 11:49:55 +1000187 if (options->gss_authentication == -1)
188 options->gss_authentication = 0;
189 if (options->gss_cleanup_creds == -1)
190 options->gss_cleanup_creds = 1;
Damien Miller95def091999-11-25 00:26:21 +1100191 if (options->password_authentication == -1)
192 options->password_authentication = 1;
Damien Miller874d77b2000-10-14 16:23:11 +1100193 if (options->kbd_interactive_authentication == -1)
194 options->kbd_interactive_authentication = 0;
Ben Lindstrom551ea372001-06-05 18:56:16 +0000195 if (options->challenge_response_authentication == -1)
196 options->challenge_response_authentication = 1;
Damien Miller95def091999-11-25 00:26:21 +1100197 if (options->permit_empty_passwd == -1)
Damien Miller98c7ad62000-03-09 21:27:49 +1100198 options->permit_empty_passwd = 0;
Ben Lindstrom5d860f02002-08-01 01:28:38 +0000199 if (options->permit_user_env == -1)
200 options->permit_user_env = 0;
Damien Miller95def091999-11-25 00:26:21 +1100201 if (options->use_login == -1)
202 options->use_login = 0;
Ben Lindstrom23e0f662002-06-21 01:09:47 +0000203 if (options->compression == -1)
Damien Miller9786e6e2005-07-26 21:54:56 +1000204 options->compression = COMP_DELAYED;
Damien Miller50a41ed2000-10-16 12:14:42 +1100205 if (options->allow_tcp_forwarding == -1)
206 options->allow_tcp_forwarding = 1;
Damien Millere247cc42000-05-07 12:03:14 +1000207 if (options->gateway_ports == -1)
208 options->gateway_ports = 0;
Damien Miller37023962000-07-11 17:31:38 +1000209 if (options->max_startups == -1)
210 options->max_startups = 10;
Damien Miller942da032000-08-18 13:59:06 +1000211 if (options->max_startups_rate == -1)
212 options->max_startups_rate = 100; /* 100% */
213 if (options->max_startups_begin == -1)
214 options->max_startups_begin = options->max_startups;
Darren Tucker89413db2004-05-24 10:36:23 +1000215 if (options->max_authtries == -1)
216 options->max_authtries = DEFAULT_AUTH_FAIL_MAX;
Damien Miller3a961dc2003-06-03 10:25:48 +1000217 if (options->use_dns == -1)
218 options->use_dns = 1;
Ben Lindstrom5744dc42001-04-13 23:28:01 +0000219 if (options->client_alive_interval == -1)
Damien Miller9f0f5c62001-12-21 14:45:46 +1100220 options->client_alive_interval = 0;
Ben Lindstrom5744dc42001-04-13 23:28:01 +0000221 if (options->client_alive_count_max == -1)
222 options->client_alive_count_max = 3;
Damien Miller75413ac2001-11-12 11:14:35 +1100223 if (options->authorized_keys_file2 == NULL) {
224 /* authorized_keys_file2 falls back to authorized_keys_file */
225 if (options->authorized_keys_file != NULL)
226 options->authorized_keys_file2 = options->authorized_keys_file;
227 else
228 options->authorized_keys_file2 = _PATH_SSH_USER_PERMITTED_KEYS2;
229 }
230 if (options->authorized_keys_file == NULL)
231 options->authorized_keys_file = _PATH_SSH_USER_PERMITTED_KEYS;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000232
Ben Lindstromfb62a692002-06-06 19:47:11 +0000233 /* Turn privilege separation on by default */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000234 if (use_privsep == -1)
Ben Lindstromfb62a692002-06-06 19:47:11 +0000235 use_privsep = 1;
Damien Miller4903eb42002-06-21 16:20:44 +1000236
Tim Rice40017b02002-07-14 13:36:49 -0700237#ifndef HAVE_MMAP
Damien Miller4903eb42002-06-21 16:20:44 +1000238 if (use_privsep && options->compression == 1) {
239 error("This platform does not support both privilege "
240 "separation and compression");
241 error("Compression disabled");
242 options->compression = 0;
243 }
244#endif
245
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000246}
247
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000248/* Keyword tokens. */
Damien Miller95def091999-11-25 00:26:21 +1100249typedef enum {
250 sBadOption, /* == unknown option */
Damien Miller726273e2001-11-12 11:40:11 +1100251 /* Portable-specific options */
Damien Miller4e448a32003-05-14 15:11:48 +1000252 sUsePAM,
Damien Miller726273e2001-11-12 11:40:11 +1100253 /* Standard Options */
Damien Miller95def091999-11-25 00:26:21 +1100254 sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime,
255 sPermitRootLogin, sLogFacility, sLogLevel,
Darren Tuckerec960f22003-08-13 20:37:05 +1000256 sRhostsRSAAuthentication, sRSAAuthentication,
Damien Miller95def091999-11-25 00:26:21 +1100257 sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup,
Darren Tucker22ef5082003-12-31 11:37:34 +1100258 sKerberosGetAFSToken,
Darren Tucker6aaa58c2003-08-02 22:24:49 +1000259 sKerberosTgtPassing, sChallengeResponseAuthentication,
Darren Tucker0f383232005-01-20 10:57:56 +1100260 sPasswordAuthentication, sKbdInteractiveAuthentication,
261 sListenAddress, sAddressFamily,
Ben Lindstrom7bfff362001-03-26 05:45:53 +0000262 sPrintMotd, sPrintLastLog, sIgnoreRhosts,
Damien Miller95c249f2002-02-05 12:11:34 +1100263 sX11Forwarding, sX11DisplayOffset, sX11UseLocalhost,
Damien Miller12c150e2003-12-17 16:31:10 +1100264 sStrictModes, sEmptyPasswd, sTCPKeepAlive,
Ben Lindstrom5d860f02002-08-01 01:28:38 +0000265 sPermitUserEnvironment, sUseLogin, sAllowTcpForwarding, sCompression,
Damien Miller50a41ed2000-10-16 12:14:42 +1100266 sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups,
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000267 sIgnoreUserKnownHosts, sCiphers, sMacs, sProtocol, sPidFile,
Darren Tucker89413db2004-05-24 10:36:23 +1000268 sGatewayPorts, sPubkeyAuthentication, sXAuthLocation, sSubsystem,
269 sMaxStartups, sMaxAuthTries,
Damien Miller3a961dc2003-06-03 10:25:48 +1000270 sBanner, sUseDNS, sHostbasedAuthentication,
Damien Miller9f0f5c62001-12-21 14:45:46 +1100271 sHostbasedUsesNameFromPacketOnly, sClientAliveInterval,
Ben Lindstrombfb3a0e2001-06-05 20:25:05 +0000272 sClientAliveCountMax, sAuthorizedKeysFile, sAuthorizedKeysFile2,
Darren Tucker46bc0752004-05-02 22:11:30 +1000273 sGssAuthentication, sGssCleanupCreds, sAcceptEnv,
Ben Lindstromc7431342002-03-22 03:11:49 +0000274 sUsePrivilegeSeparation,
Damien Millerf9b3feb2003-05-16 11:38:32 +1000275 sDeprecated, sUnsupported
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000276} ServerOpCodes;
277
278/* Textual representation of the tokens. */
Damien Miller95def091999-11-25 00:26:21 +1100279static struct {
280 const char *name;
281 ServerOpCodes opcode;
282} keywords[] = {
Damien Miller726273e2001-11-12 11:40:11 +1100283 /* Portable-specific options */
Damien Miller6ac2c482003-05-16 11:42:35 +1000284#ifdef USE_PAM
Damien Miller30912f72003-08-26 10:48:14 +1000285 { "usepam", sUsePAM },
Damien Miller6ac2c482003-05-16 11:42:35 +1000286#else
Damien Miller30912f72003-08-26 10:48:14 +1000287 { "usepam", sUnsupported },
Damien Miller6ac2c482003-05-16 11:42:35 +1000288#endif
Damien Miller30912f72003-08-26 10:48:14 +1000289 { "pamauthenticationviakbdint", sDeprecated },
Damien Miller726273e2001-11-12 11:40:11 +1100290 /* Standard Options */
Damien Miller95def091999-11-25 00:26:21 +1100291 { "port", sPort },
292 { "hostkey", sHostKeyFile },
Damien Miller0bc1bd82000-11-13 22:57:25 +1100293 { "hostdsakey", sHostKeyFile }, /* alias */
Kevin Stevesef4eea92001-02-05 12:42:17 +0000294 { "pidfile", sPidFile },
Damien Miller95def091999-11-25 00:26:21 +1100295 { "serverkeybits", sServerKeyBits },
296 { "logingracetime", sLoginGraceTime },
297 { "keyregenerationinterval", sKeyRegenerationTime },
298 { "permitrootlogin", sPermitRootLogin },
299 { "syslogfacility", sLogFacility },
300 { "loglevel", sLogLevel },
Darren Tuckerec960f22003-08-13 20:37:05 +1000301 { "rhostsauthentication", sDeprecated },
Damien Miller95def091999-11-25 00:26:21 +1100302 { "rhostsrsaauthentication", sRhostsRSAAuthentication },
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000303 { "hostbasedauthentication", sHostbasedAuthentication },
304 { "hostbasedusesnamefrompacketonly", sHostbasedUsesNameFromPacketOnly },
Damien Miller95def091999-11-25 00:26:21 +1100305 { "rsaauthentication", sRSAAuthentication },
Damien Miller0bc1bd82000-11-13 22:57:25 +1100306 { "pubkeyauthentication", sPubkeyAuthentication },
307 { "dsaauthentication", sPubkeyAuthentication }, /* alias */
Darren Tucker6aaa58c2003-08-02 22:24:49 +1000308#ifdef KRB5
Damien Miller95def091999-11-25 00:26:21 +1100309 { "kerberosauthentication", sKerberosAuthentication },
310 { "kerberosorlocalpasswd", sKerberosOrLocalPasswd },
311 { "kerberosticketcleanup", sKerberosTicketCleanup },
Darren Tucker3c78c5e2004-01-23 22:03:10 +1100312#ifdef USE_AFS
Darren Tucker22ef5082003-12-31 11:37:34 +1100313 { "kerberosgetafstoken", sKerberosGetAFSToken },
Damien Millerf9b3feb2003-05-16 11:38:32 +1000314#else
Darren Tucker409cb322004-01-05 22:36:51 +1100315 { "kerberosgetafstoken", sUnsupported },
316#endif
317#else
Damien Millerf9b3feb2003-05-16 11:38:32 +1000318 { "kerberosauthentication", sUnsupported },
319 { "kerberosorlocalpasswd", sUnsupported },
320 { "kerberosticketcleanup", sUnsupported },
Darren Tucker22ef5082003-12-31 11:37:34 +1100321 { "kerberosgetafstoken", sUnsupported },
Damien Millerf9b3feb2003-05-16 11:38:32 +1000322#endif
Damien Miller1a0c0b92003-09-02 22:51:17 +1000323 { "kerberostgtpassing", sUnsupported },
Damien Millerf9b3feb2003-05-16 11:38:32 +1000324 { "afstokenpassing", sUnsupported },
Darren Tucker0efd1552003-08-26 11:49:55 +1000325#ifdef GSSAPI
326 { "gssapiauthentication", sGssAuthentication },
Darren Tuckera49d36e2003-10-02 16:20:54 +1000327 { "gssapicleanupcredentials", sGssCleanupCreds },
Darren Tucker0efd1552003-08-26 11:49:55 +1000328#else
329 { "gssapiauthentication", sUnsupported },
Darren Tuckera49d36e2003-10-02 16:20:54 +1000330 { "gssapicleanupcredentials", sUnsupported },
Darren Tucker0efd1552003-08-26 11:49:55 +1000331#endif
Damien Miller95def091999-11-25 00:26:21 +1100332 { "passwordauthentication", sPasswordAuthentication },
Damien Miller874d77b2000-10-14 16:23:11 +1100333 { "kbdinteractiveauthentication", sKbdInteractiveAuthentication },
Ben Lindstrom95fb2dd2001-01-23 03:12:10 +0000334 { "challengeresponseauthentication", sChallengeResponseAuthentication },
335 { "skeyauthentication", sChallengeResponseAuthentication }, /* alias */
Ben Lindstrom91e98682001-09-12 16:32:14 +0000336 { "checkmail", sDeprecated },
Damien Miller95def091999-11-25 00:26:21 +1100337 { "listenaddress", sListenAddress },
Darren Tucker0f383232005-01-20 10:57:56 +1100338 { "addressfamily", sAddressFamily },
Damien Miller95def091999-11-25 00:26:21 +1100339 { "printmotd", sPrintMotd },
Ben Lindstrom7bfff362001-03-26 05:45:53 +0000340 { "printlastlog", sPrintLastLog },
Damien Miller95def091999-11-25 00:26:21 +1100341 { "ignorerhosts", sIgnoreRhosts },
342 { "ignoreuserknownhosts", sIgnoreUserKnownHosts },
343 { "x11forwarding", sX11Forwarding },
344 { "x11displayoffset", sX11DisplayOffset },
Damien Miller95c249f2002-02-05 12:11:34 +1100345 { "x11uselocalhost", sX11UseLocalhost },
Damien Millerd3a18572000-06-07 19:55:44 +1000346 { "xauthlocation", sXAuthLocation },
Damien Miller95def091999-11-25 00:26:21 +1100347 { "strictmodes", sStrictModes },
348 { "permitemptypasswords", sEmptyPasswd },
Ben Lindstrom5d860f02002-08-01 01:28:38 +0000349 { "permituserenvironment", sPermitUserEnvironment },
Damien Miller95def091999-11-25 00:26:21 +1100350 { "uselogin", sUseLogin },
Ben Lindstrom23e0f662002-06-21 01:09:47 +0000351 { "compression", sCompression },
Damien Miller12c150e2003-12-17 16:31:10 +1100352 { "tcpkeepalive", sTCPKeepAlive },
353 { "keepalive", sTCPKeepAlive }, /* obsolete alias */
Damien Miller50a41ed2000-10-16 12:14:42 +1100354 { "allowtcpforwarding", sAllowTcpForwarding },
Damien Miller95def091999-11-25 00:26:21 +1100355 { "allowusers", sAllowUsers },
356 { "denyusers", sDenyUsers },
357 { "allowgroups", sAllowGroups },
358 { "denygroups", sDenyGroups },
Damien Miller78928792000-04-12 20:17:38 +1000359 { "ciphers", sCiphers },
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000360 { "macs", sMacs },
Damien Miller78928792000-04-12 20:17:38 +1000361 { "protocol", sProtocol },
Damien Millere247cc42000-05-07 12:03:14 +1000362 { "gatewayports", sGatewayPorts },
Damien Millerf6d9e222000-06-18 14:50:44 +1000363 { "subsystem", sSubsystem },
Damien Miller37023962000-07-11 17:31:38 +1000364 { "maxstartups", sMaxStartups },
Darren Tucker89413db2004-05-24 10:36:23 +1000365 { "maxauthtries", sMaxAuthTries },
Ben Lindstrom48bd7c12001-01-09 00:35:42 +0000366 { "banner", sBanner },
Damien Miller3a961dc2003-06-03 10:25:48 +1000367 { "usedns", sUseDNS },
368 { "verifyreversemapping", sDeprecated },
369 { "reversemappingcheck", sDeprecated },
Ben Lindstrom5744dc42001-04-13 23:28:01 +0000370 { "clientaliveinterval", sClientAliveInterval },
371 { "clientalivecountmax", sClientAliveCountMax },
Ben Lindstrombfb3a0e2001-06-05 20:25:05 +0000372 { "authorizedkeysfile", sAuthorizedKeysFile },
373 { "authorizedkeysfile2", sAuthorizedKeysFile2 },
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000374 { "useprivilegeseparation", sUsePrivilegeSeparation},
Darren Tucker46bc0752004-05-02 22:11:30 +1000375 { "acceptenv", sAcceptEnv },
Ben Lindstrom65366a82001-12-06 16:32:47 +0000376 { NULL, sBadOption }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000377};
378
Damien Miller5428f641999-11-25 11:54:57 +1100379/*
Ben Lindstrom3704c262001-04-02 18:20:03 +0000380 * Returns the number of the token pointed to by cp or sBadOption.
Damien Miller5428f641999-11-25 11:54:57 +1100381 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000382
Damien Miller4af51302000-04-16 11:18:38 +1000383static ServerOpCodes
Damien Miller95def091999-11-25 00:26:21 +1100384parse_token(const char *cp, const char *filename,
385 int linenum)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000386{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000387 u_int i;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000388
Damien Miller95def091999-11-25 00:26:21 +1100389 for (i = 0; keywords[i].name; i++)
Damien Miller5428f641999-11-25 11:54:57 +1100390 if (strcasecmp(cp, keywords[i].name) == 0)
Damien Miller95def091999-11-25 00:26:21 +1100391 return keywords[i].opcode;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000392
Ben Lindstromb5cdc662001-04-16 02:13:26 +0000393 error("%s: line %d: Bad configuration option: %s",
394 filename, linenum, cp);
Damien Miller95def091999-11-25 00:26:21 +1100395 return sBadOption;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000396}
397
Ben Lindstrombba81212001-06-25 05:01:22 +0000398static void
Ben Lindstrom19066a12001-04-12 23:39:26 +0000399add_listen_addr(ServerOptions *options, char *addr, u_short port)
Damien Miller34132e52000-01-14 15:45:46 +1100400{
Damien Millereccb9de2005-06-17 12:59:34 +1000401 u_int i;
Damien Miller34132e52000-01-14 15:45:46 +1100402
403 if (options->num_ports == 0)
404 options->ports[options->num_ports++] = SSH_DEFAULT_PORT;
Darren Tucker0f383232005-01-20 10:57:56 +1100405 if (options->address_family == -1)
406 options->address_family = AF_UNSPEC;
Ben Lindstrom19066a12001-04-12 23:39:26 +0000407 if (port == 0)
Ben Lindstromc510af42001-04-07 17:25:48 +0000408 for (i = 0; i < options->num_ports; i++)
409 add_one_listen_addr(options, addr, options->ports[i]);
410 else
Ben Lindstrom19066a12001-04-12 23:39:26 +0000411 add_one_listen_addr(options, addr, port);
Ben Lindstromc510af42001-04-07 17:25:48 +0000412}
413
Ben Lindstrombba81212001-06-25 05:01:22 +0000414static void
Ben Lindstromc510af42001-04-07 17:25:48 +0000415add_one_listen_addr(ServerOptions *options, char *addr, u_short port)
416{
417 struct addrinfo hints, *ai, *aitop;
418 char strport[NI_MAXSERV];
419 int gaierr;
420
421 memset(&hints, 0, sizeof(hints));
Darren Tucker0f383232005-01-20 10:57:56 +1100422 hints.ai_family = options->address_family;
Ben Lindstromc510af42001-04-07 17:25:48 +0000423 hints.ai_socktype = SOCK_STREAM;
424 hints.ai_flags = (addr == NULL) ? AI_PASSIVE : 0;
Ben Lindstrome1353632002-06-23 21:29:23 +0000425 snprintf(strport, sizeof strport, "%u", port);
Ben Lindstromc510af42001-04-07 17:25:48 +0000426 if ((gaierr = getaddrinfo(addr, strport, &hints, &aitop)) != 0)
427 fatal("bad addr or host: %s (%s)",
428 addr ? addr : "<NULL>",
429 gai_strerror(gaierr));
430 for (ai = aitop; ai->ai_next; ai = ai->ai_next)
431 ;
432 ai->ai_next = options->listen_addrs;
433 options->listen_addrs = aitop;
Damien Miller34132e52000-01-14 15:45:46 +1100434}
435
Ben Lindstromade03f62001-12-06 18:22:17 +0000436int
437process_server_config_line(ServerOptions *options, char *line,
438 const char *filename, int linenum)
439{
440 char *cp, **charptr, *arg, *p;
Damien Millereccb9de2005-06-17 12:59:34 +1000441 int *intptr, value, n;
Ben Lindstromade03f62001-12-06 18:22:17 +0000442 ServerOpCodes opcode;
Damien Millerf91ee4c2005-03-01 21:24:33 +1100443 u_short port;
Damien Millereccb9de2005-06-17 12:59:34 +1000444 u_int i;
Ben Lindstromade03f62001-12-06 18:22:17 +0000445
446 cp = line;
447 arg = strdelim(&cp);
448 /* Ignore leading whitespace */
449 if (*arg == '\0')
450 arg = strdelim(&cp);
451 if (!arg || !*arg || *arg == '#')
452 return 0;
453 intptr = NULL;
454 charptr = NULL;
455 opcode = parse_token(arg, filename, linenum);
456 switch (opcode) {
457 /* Portable-specific options */
Damien Miller4e448a32003-05-14 15:11:48 +1000458 case sUsePAM:
459 intptr = &options->use_pam;
Ben Lindstromade03f62001-12-06 18:22:17 +0000460 goto parse_flag;
461
462 /* Standard Options */
463 case sBadOption:
464 return -1;
465 case sPort:
466 /* ignore ports from configfile if cmdline specifies ports */
467 if (options->ports_from_cmdline)
468 return 0;
469 if (options->listen_addrs != NULL)
470 fatal("%s line %d: ports must be specified before "
Damien Miller4fbf08a2002-01-22 23:35:09 +1100471 "ListenAddress.", filename, linenum);
Ben Lindstromade03f62001-12-06 18:22:17 +0000472 if (options->num_ports >= MAX_PORTS)
473 fatal("%s line %d: too many ports.",
474 filename, linenum);
475 arg = strdelim(&cp);
476 if (!arg || *arg == '\0')
477 fatal("%s line %d: missing port number.",
478 filename, linenum);
479 options->ports[options->num_ports++] = a2port(arg);
480 if (options->ports[options->num_ports-1] == 0)
481 fatal("%s line %d: Badly formatted port number.",
482 filename, linenum);
483 break;
484
485 case sServerKeyBits:
486 intptr = &options->server_key_bits;
487parse_int:
488 arg = strdelim(&cp);
489 if (!arg || *arg == '\0')
490 fatal("%s line %d: missing integer value.",
491 filename, linenum);
492 value = atoi(arg);
493 if (*intptr == -1)
494 *intptr = value;
495 break;
496
497 case sLoginGraceTime:
498 intptr = &options->login_grace_time;
499parse_time:
500 arg = strdelim(&cp);
501 if (!arg || *arg == '\0')
502 fatal("%s line %d: missing time value.",
503 filename, linenum);
504 if ((value = convtime(arg)) == -1)
505 fatal("%s line %d: invalid time value.",
506 filename, linenum);
507 if (*intptr == -1)
508 *intptr = value;
509 break;
510
511 case sKeyRegenerationTime:
512 intptr = &options->key_regeneration_time;
513 goto parse_time;
514
515 case sListenAddress:
516 arg = strdelim(&cp);
Damien Millerf91ee4c2005-03-01 21:24:33 +1100517 if (arg == NULL || *arg == '\0')
518 fatal("%s line %d: missing address",
Ben Lindstromade03f62001-12-06 18:22:17 +0000519 filename, linenum);
Damien Miller203c7052005-08-12 22:11:37 +1000520 /* check for bare IPv6 address: no "[]" and 2 or more ":" */
521 if (strchr(arg, '[') == NULL && (p = strchr(arg, ':')) != NULL
522 && strchr(p+1, ':') != NULL) {
523 add_listen_addr(options, arg, 0);
524 break;
525 }
Damien Millerf91ee4c2005-03-01 21:24:33 +1100526 p = hpdelim(&arg);
527 if (p == NULL)
528 fatal("%s line %d: bad address:port usage",
529 filename, linenum);
530 p = cleanhostname(p);
531 if (arg == NULL)
532 port = 0;
533 else if ((port = a2port(arg)) == 0)
534 fatal("%s line %d: bad port number", filename, linenum);
Ben Lindstromade03f62001-12-06 18:22:17 +0000535
Damien Millerf91ee4c2005-03-01 21:24:33 +1100536 add_listen_addr(options, p, port);
537
Ben Lindstromade03f62001-12-06 18:22:17 +0000538 break;
539
Darren Tucker0f383232005-01-20 10:57:56 +1100540 case sAddressFamily:
541 arg = strdelim(&cp);
Damien Miller17b23d82005-05-26 12:11:56 +1000542 if (!arg || *arg == '\0')
543 fatal("%s line %d: missing address family.",
544 filename, linenum);
Darren Tucker0f383232005-01-20 10:57:56 +1100545 intptr = &options->address_family;
546 if (options->listen_addrs != NULL)
547 fatal("%s line %d: address family must be specified before "
548 "ListenAddress.", filename, linenum);
549 if (strcasecmp(arg, "inet") == 0)
550 value = AF_INET;
551 else if (strcasecmp(arg, "inet6") == 0)
552 value = AF_INET6;
553 else if (strcasecmp(arg, "any") == 0)
554 value = AF_UNSPEC;
555 else
556 fatal("%s line %d: unsupported address family \"%s\".",
557 filename, linenum, arg);
558 if (*intptr == -1)
559 *intptr = value;
560 break;
561
Ben Lindstromade03f62001-12-06 18:22:17 +0000562 case sHostKeyFile:
563 intptr = &options->num_host_key_files;
564 if (*intptr >= MAX_HOSTKEYS)
565 fatal("%s line %d: too many host keys specified (max %d).",
566 filename, linenum, MAX_HOSTKEYS);
567 charptr = &options->host_key_files[*intptr];
568parse_filename:
569 arg = strdelim(&cp);
570 if (!arg || *arg == '\0')
571 fatal("%s line %d: missing file name.",
572 filename, linenum);
573 if (*charptr == NULL) {
574 *charptr = tilde_expand_filename(arg, getuid());
575 /* increase optional counter */
576 if (intptr != NULL)
577 *intptr = *intptr + 1;
578 }
579 break;
580
581 case sPidFile:
582 charptr = &options->pid_file;
583 goto parse_filename;
584
585 case sPermitRootLogin:
586 intptr = &options->permit_root_login;
587 arg = strdelim(&cp);
588 if (!arg || *arg == '\0')
589 fatal("%s line %d: missing yes/"
590 "without-password/forced-commands-only/no "
591 "argument.", filename, linenum);
592 value = 0; /* silence compiler */
593 if (strcmp(arg, "without-password") == 0)
594 value = PERMIT_NO_PASSWD;
595 else if (strcmp(arg, "forced-commands-only") == 0)
596 value = PERMIT_FORCED_ONLY;
597 else if (strcmp(arg, "yes") == 0)
598 value = PERMIT_YES;
599 else if (strcmp(arg, "no") == 0)
600 value = PERMIT_NO;
601 else
602 fatal("%s line %d: Bad yes/"
603 "without-password/forced-commands-only/no "
604 "argument: %s", filename, linenum, arg);
605 if (*intptr == -1)
606 *intptr = value;
607 break;
608
609 case sIgnoreRhosts:
610 intptr = &options->ignore_rhosts;
611parse_flag:
612 arg = strdelim(&cp);
613 if (!arg || *arg == '\0')
614 fatal("%s line %d: missing yes/no argument.",
615 filename, linenum);
616 value = 0; /* silence compiler */
617 if (strcmp(arg, "yes") == 0)
618 value = 1;
619 else if (strcmp(arg, "no") == 0)
620 value = 0;
621 else
622 fatal("%s line %d: Bad yes/no argument: %s",
623 filename, linenum, arg);
624 if (*intptr == -1)
625 *intptr = value;
626 break;
627
628 case sIgnoreUserKnownHosts:
629 intptr = &options->ignore_user_known_hosts;
630 goto parse_flag;
631
Ben Lindstromade03f62001-12-06 18:22:17 +0000632 case sRhostsRSAAuthentication:
633 intptr = &options->rhosts_rsa_authentication;
634 goto parse_flag;
635
636 case sHostbasedAuthentication:
637 intptr = &options->hostbased_authentication;
638 goto parse_flag;
639
640 case sHostbasedUsesNameFromPacketOnly:
641 intptr = &options->hostbased_uses_name_from_packet_only;
642 goto parse_flag;
643
644 case sRSAAuthentication:
645 intptr = &options->rsa_authentication;
646 goto parse_flag;
647
648 case sPubkeyAuthentication:
649 intptr = &options->pubkey_authentication;
650 goto parse_flag;
Damien Miller2aa0ab42003-05-15 12:05:28 +1000651
Ben Lindstromade03f62001-12-06 18:22:17 +0000652 case sKerberosAuthentication:
653 intptr = &options->kerberos_authentication;
654 goto parse_flag;
655
656 case sKerberosOrLocalPasswd:
657 intptr = &options->kerberos_or_local_passwd;
658 goto parse_flag;
659
660 case sKerberosTicketCleanup:
661 intptr = &options->kerberos_ticket_cleanup;
662 goto parse_flag;
Damien Miller2aa0ab42003-05-15 12:05:28 +1000663
Darren Tucker22ef5082003-12-31 11:37:34 +1100664 case sKerberosGetAFSToken:
665 intptr = &options->kerberos_get_afs_token;
666 goto parse_flag;
667
Darren Tucker0efd1552003-08-26 11:49:55 +1000668 case sGssAuthentication:
669 intptr = &options->gss_authentication;
670 goto parse_flag;
671
672 case sGssCleanupCreds:
673 intptr = &options->gss_cleanup_creds;
674 goto parse_flag;
675
Ben Lindstromade03f62001-12-06 18:22:17 +0000676 case sPasswordAuthentication:
677 intptr = &options->password_authentication;
678 goto parse_flag;
679
680 case sKbdInteractiveAuthentication:
681 intptr = &options->kbd_interactive_authentication;
682 goto parse_flag;
683
684 case sChallengeResponseAuthentication:
685 intptr = &options->challenge_response_authentication;
686 goto parse_flag;
687
688 case sPrintMotd:
689 intptr = &options->print_motd;
690 goto parse_flag;
691
692 case sPrintLastLog:
693 intptr = &options->print_lastlog;
694 goto parse_flag;
695
696 case sX11Forwarding:
697 intptr = &options->x11_forwarding;
698 goto parse_flag;
699
700 case sX11DisplayOffset:
701 intptr = &options->x11_display_offset;
702 goto parse_int;
703
Damien Miller95c249f2002-02-05 12:11:34 +1100704 case sX11UseLocalhost:
705 intptr = &options->x11_use_localhost;
706 goto parse_flag;
707
Ben Lindstromade03f62001-12-06 18:22:17 +0000708 case sXAuthLocation:
709 charptr = &options->xauth_location;
710 goto parse_filename;
711
712 case sStrictModes:
713 intptr = &options->strict_modes;
714 goto parse_flag;
715
Damien Miller12c150e2003-12-17 16:31:10 +1100716 case sTCPKeepAlive:
717 intptr = &options->tcp_keep_alive;
Ben Lindstromade03f62001-12-06 18:22:17 +0000718 goto parse_flag;
719
720 case sEmptyPasswd:
721 intptr = &options->permit_empty_passwd;
722 goto parse_flag;
723
Ben Lindstrom5d860f02002-08-01 01:28:38 +0000724 case sPermitUserEnvironment:
725 intptr = &options->permit_user_env;
726 goto parse_flag;
727
Ben Lindstromade03f62001-12-06 18:22:17 +0000728 case sUseLogin:
729 intptr = &options->use_login;
730 goto parse_flag;
731
Ben Lindstrom23e0f662002-06-21 01:09:47 +0000732 case sCompression:
733 intptr = &options->compression;
Damien Miller9786e6e2005-07-26 21:54:56 +1000734 arg = strdelim(&cp);
735 if (!arg || *arg == '\0')
736 fatal("%s line %d: missing yes/no/delayed "
737 "argument.", filename, linenum);
738 value = 0; /* silence compiler */
739 if (strcmp(arg, "delayed") == 0)
740 value = COMP_DELAYED;
741 else if (strcmp(arg, "yes") == 0)
742 value = COMP_ZLIB;
743 else if (strcmp(arg, "no") == 0)
744 value = COMP_NONE;
745 else
746 fatal("%s line %d: Bad yes/no/delayed "
747 "argument: %s", filename, linenum, arg);
748 if (*intptr == -1)
749 *intptr = value;
750 break;
Ben Lindstrom23e0f662002-06-21 01:09:47 +0000751
Ben Lindstromade03f62001-12-06 18:22:17 +0000752 case sGatewayPorts:
753 intptr = &options->gateway_ports;
Damien Millerf91ee4c2005-03-01 21:24:33 +1100754 arg = strdelim(&cp);
755 if (!arg || *arg == '\0')
756 fatal("%s line %d: missing yes/no/clientspecified "
757 "argument.", filename, linenum);
758 value = 0; /* silence compiler */
759 if (strcmp(arg, "clientspecified") == 0)
760 value = 2;
761 else if (strcmp(arg, "yes") == 0)
762 value = 1;
763 else if (strcmp(arg, "no") == 0)
764 value = 0;
765 else
766 fatal("%s line %d: Bad yes/no/clientspecified "
767 "argument: %s", filename, linenum, arg);
768 if (*intptr == -1)
769 *intptr = value;
770 break;
Ben Lindstromade03f62001-12-06 18:22:17 +0000771
Damien Miller3a961dc2003-06-03 10:25:48 +1000772 case sUseDNS:
773 intptr = &options->use_dns;
Ben Lindstromade03f62001-12-06 18:22:17 +0000774 goto parse_flag;
775
776 case sLogFacility:
777 intptr = (int *) &options->log_facility;
778 arg = strdelim(&cp);
779 value = log_facility_number(arg);
Damien Millerfcd93202002-02-05 12:26:34 +1100780 if (value == SYSLOG_FACILITY_NOT_SET)
Ben Lindstromade03f62001-12-06 18:22:17 +0000781 fatal("%.200s line %d: unsupported log facility '%s'",
782 filename, linenum, arg ? arg : "<NONE>");
783 if (*intptr == -1)
784 *intptr = (SyslogFacility) value;
785 break;
786
787 case sLogLevel:
788 intptr = (int *) &options->log_level;
789 arg = strdelim(&cp);
790 value = log_level_number(arg);
Damien Millerfcd93202002-02-05 12:26:34 +1100791 if (value == SYSLOG_LEVEL_NOT_SET)
Ben Lindstromade03f62001-12-06 18:22:17 +0000792 fatal("%.200s line %d: unsupported log level '%s'",
793 filename, linenum, arg ? arg : "<NONE>");
794 if (*intptr == -1)
795 *intptr = (LogLevel) value;
796 break;
797
798 case sAllowTcpForwarding:
799 intptr = &options->allow_tcp_forwarding;
800 goto parse_flag;
801
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000802 case sUsePrivilegeSeparation:
803 intptr = &use_privsep;
804 goto parse_flag;
805
Ben Lindstromade03f62001-12-06 18:22:17 +0000806 case sAllowUsers:
807 while ((arg = strdelim(&cp)) && *arg != '\0') {
808 if (options->num_allow_users >= MAX_ALLOW_USERS)
809 fatal("%s line %d: too many allow users.",
810 filename, linenum);
Ben Lindstrome1353632002-06-23 21:29:23 +0000811 options->allow_users[options->num_allow_users++] =
812 xstrdup(arg);
Ben Lindstromade03f62001-12-06 18:22:17 +0000813 }
814 break;
815
816 case sDenyUsers:
817 while ((arg = strdelim(&cp)) && *arg != '\0') {
818 if (options->num_deny_users >= MAX_DENY_USERS)
819 fatal( "%s line %d: too many deny users.",
820 filename, linenum);
Ben Lindstrome1353632002-06-23 21:29:23 +0000821 options->deny_users[options->num_deny_users++] =
822 xstrdup(arg);
Ben Lindstromade03f62001-12-06 18:22:17 +0000823 }
824 break;
825
826 case sAllowGroups:
827 while ((arg = strdelim(&cp)) && *arg != '\0') {
828 if (options->num_allow_groups >= MAX_ALLOW_GROUPS)
829 fatal("%s line %d: too many allow groups.",
830 filename, linenum);
Ben Lindstrome1353632002-06-23 21:29:23 +0000831 options->allow_groups[options->num_allow_groups++] =
832 xstrdup(arg);
Ben Lindstromade03f62001-12-06 18:22:17 +0000833 }
834 break;
835
836 case sDenyGroups:
837 while ((arg = strdelim(&cp)) && *arg != '\0') {
838 if (options->num_deny_groups >= MAX_DENY_GROUPS)
839 fatal("%s line %d: too many deny groups.",
840 filename, linenum);
841 options->deny_groups[options->num_deny_groups++] = xstrdup(arg);
842 }
843 break;
844
845 case sCiphers:
846 arg = strdelim(&cp);
847 if (!arg || *arg == '\0')
848 fatal("%s line %d: Missing argument.", filename, linenum);
849 if (!ciphers_valid(arg))
850 fatal("%s line %d: Bad SSH2 cipher spec '%s'.",
851 filename, linenum, arg ? arg : "<NONE>");
852 if (options->ciphers == NULL)
853 options->ciphers = xstrdup(arg);
854 break;
855
856 case sMacs:
857 arg = strdelim(&cp);
858 if (!arg || *arg == '\0')
859 fatal("%s line %d: Missing argument.", filename, linenum);
860 if (!mac_valid(arg))
861 fatal("%s line %d: Bad SSH2 mac spec '%s'.",
862 filename, linenum, arg ? arg : "<NONE>");
863 if (options->macs == NULL)
864 options->macs = xstrdup(arg);
865 break;
866
867 case sProtocol:
868 intptr = &options->protocol;
869 arg = strdelim(&cp);
870 if (!arg || *arg == '\0')
871 fatal("%s line %d: Missing argument.", filename, linenum);
872 value = proto_spec(arg);
873 if (value == SSH_PROTO_UNKNOWN)
874 fatal("%s line %d: Bad protocol spec '%s'.",
Damien Miller9f0f5c62001-12-21 14:45:46 +1100875 filename, linenum, arg ? arg : "<NONE>");
Ben Lindstromade03f62001-12-06 18:22:17 +0000876 if (*intptr == SSH_PROTO_UNKNOWN)
877 *intptr = value;
878 break;
879
880 case sSubsystem:
881 if (options->num_subsystems >= MAX_SUBSYSTEMS) {
882 fatal("%s line %d: too many subsystems defined.",
Damien Miller9f0f5c62001-12-21 14:45:46 +1100883 filename, linenum);
Ben Lindstromade03f62001-12-06 18:22:17 +0000884 }
885 arg = strdelim(&cp);
886 if (!arg || *arg == '\0')
887 fatal("%s line %d: Missing subsystem name.",
Damien Miller9f0f5c62001-12-21 14:45:46 +1100888 filename, linenum);
Ben Lindstromade03f62001-12-06 18:22:17 +0000889 for (i = 0; i < options->num_subsystems; i++)
890 if (strcmp(arg, options->subsystem_name[i]) == 0)
891 fatal("%s line %d: Subsystem '%s' already defined.",
Damien Miller9f0f5c62001-12-21 14:45:46 +1100892 filename, linenum, arg);
Ben Lindstromade03f62001-12-06 18:22:17 +0000893 options->subsystem_name[options->num_subsystems] = xstrdup(arg);
894 arg = strdelim(&cp);
895 if (!arg || *arg == '\0')
896 fatal("%s line %d: Missing subsystem command.",
Damien Miller9f0f5c62001-12-21 14:45:46 +1100897 filename, linenum);
Ben Lindstromade03f62001-12-06 18:22:17 +0000898 options->subsystem_command[options->num_subsystems] = xstrdup(arg);
899 options->num_subsystems++;
900 break;
901
902 case sMaxStartups:
903 arg = strdelim(&cp);
904 if (!arg || *arg == '\0')
905 fatal("%s line %d: Missing MaxStartups spec.",
Damien Miller9f0f5c62001-12-21 14:45:46 +1100906 filename, linenum);
Ben Lindstromade03f62001-12-06 18:22:17 +0000907 if ((n = sscanf(arg, "%d:%d:%d",
908 &options->max_startups_begin,
909 &options->max_startups_rate,
910 &options->max_startups)) == 3) {
911 if (options->max_startups_begin >
912 options->max_startups ||
913 options->max_startups_rate > 100 ||
914 options->max_startups_rate < 1)
915 fatal("%s line %d: Illegal MaxStartups spec.",
916 filename, linenum);
917 } else if (n != 1)
918 fatal("%s line %d: Illegal MaxStartups spec.",
919 filename, linenum);
920 else
921 options->max_startups = options->max_startups_begin;
922 break;
923
Darren Tucker89413db2004-05-24 10:36:23 +1000924 case sMaxAuthTries:
925 intptr = &options->max_authtries;
926 goto parse_int;
927
Ben Lindstromade03f62001-12-06 18:22:17 +0000928 case sBanner:
929 charptr = &options->banner;
930 goto parse_filename;
931 /*
932 * These options can contain %X options expanded at
933 * connect time, so that you can specify paths like:
934 *
935 * AuthorizedKeysFile /etc/ssh_keys/%u
936 */
937 case sAuthorizedKeysFile:
938 case sAuthorizedKeysFile2:
939 charptr = (opcode == sAuthorizedKeysFile ) ?
940 &options->authorized_keys_file :
941 &options->authorized_keys_file2;
942 goto parse_filename;
943
944 case sClientAliveInterval:
945 intptr = &options->client_alive_interval;
946 goto parse_time;
947
948 case sClientAliveCountMax:
949 intptr = &options->client_alive_count_max;
950 goto parse_int;
951
Darren Tucker46bc0752004-05-02 22:11:30 +1000952 case sAcceptEnv:
953 while ((arg = strdelim(&cp)) && *arg != '\0') {
954 if (strchr(arg, '=') != NULL)
955 fatal("%s line %d: Invalid environment name.",
956 filename, linenum);
957 if (options->num_accept_env >= MAX_ACCEPT_ENV)
958 fatal("%s line %d: too many allow env.",
959 filename, linenum);
960 options->accept_env[options->num_accept_env++] =
961 xstrdup(arg);
962 }
963 break;
964
Ben Lindstromade03f62001-12-06 18:22:17 +0000965 case sDeprecated:
Damien Miller996acd22003-04-09 20:59:48 +1000966 logit("%s line %d: Deprecated option %s",
Ben Lindstromade03f62001-12-06 18:22:17 +0000967 filename, linenum, arg);
968 while (arg)
969 arg = strdelim(&cp);
970 break;
971
Damien Millerf9b3feb2003-05-16 11:38:32 +1000972 case sUnsupported:
973 logit("%s line %d: Unsupported option %s",
974 filename, linenum, arg);
975 while (arg)
976 arg = strdelim(&cp);
977 break;
978
Ben Lindstromade03f62001-12-06 18:22:17 +0000979 default:
980 fatal("%s line %d: Missing handler for opcode %s (%d)",
981 filename, linenum, arg, opcode);
982 }
983 if ((arg = strdelim(&cp)) != NULL && *arg != '\0')
984 fatal("%s line %d: garbage at end of line; \"%.200s\".",
985 filename, linenum, arg);
986 return 0;
987}
988
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000989/* Reads the server configuration file. */
990
Damien Miller4af51302000-04-16 11:18:38 +1000991void
Darren Tucker645ab752004-06-25 13:33:20 +1000992load_server_config(const char *filename, Buffer *conf)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000993{
Darren Tucker645ab752004-06-25 13:33:20 +1000994 char line[1024], *cp;
Ben Lindstrome1353632002-06-23 21:29:23 +0000995 FILE *f;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000996
Darren Tucker645ab752004-06-25 13:33:20 +1000997 debug2("%s: filename %s", __func__, filename);
998 if ((f = fopen(filename, "r")) == NULL) {
Damien Miller95def091999-11-25 00:26:21 +1100999 perror(filename);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001000 exit(1);
Damien Miller95def091999-11-25 00:26:21 +11001001 }
Darren Tucker645ab752004-06-25 13:33:20 +10001002 buffer_clear(conf);
Damien Miller95def091999-11-25 00:26:21 +11001003 while (fgets(line, sizeof(line), f)) {
Darren Tucker645ab752004-06-25 13:33:20 +10001004 /*
1005 * Trim out comments and strip whitespace
Darren Tuckerfc959702004-07-17 16:12:08 +10001006 * NB - preserve newlines, they are needed to reproduce
Darren Tucker645ab752004-06-25 13:33:20 +10001007 * line numbers later for error messages
1008 */
1009 if ((cp = strchr(line, '#')) != NULL)
1010 memcpy(cp, "\n", 2);
1011 cp = line + strspn(line, " \t\r");
1012
1013 buffer_append(conf, cp, strlen(cp));
1014 }
1015 buffer_append(conf, "\0", 1);
1016 fclose(f);
1017 debug2("%s: done config len = %d", __func__, buffer_len(conf));
1018}
1019
1020void
1021parse_server_config(ServerOptions *options, const char *filename, Buffer *conf)
1022{
1023 int linenum, bad_options = 0;
Darren Tucker9fbac712004-08-12 22:41:44 +10001024 char *cp, *obuf, *cbuf;
Darren Tucker645ab752004-06-25 13:33:20 +10001025
1026 debug2("%s: config %s len %d", __func__, filename, buffer_len(conf));
1027
Darren Tucker9fbac712004-08-12 22:41:44 +10001028 obuf = cbuf = xstrdup(buffer_ptr(conf));
Darren Tucker137e9c92004-08-13 21:30:24 +10001029 linenum = 1;
Darren Tucker47eede72005-03-14 23:08:12 +11001030 while ((cp = strsep(&cbuf, "\n")) != NULL) {
Darren Tucker645ab752004-06-25 13:33:20 +10001031 if (process_server_config_line(options, cp, filename,
1032 linenum++) != 0)
Damien Miller95def091999-11-25 00:26:21 +11001033 bad_options++;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001034 }
Darren Tucker9fbac712004-08-12 22:41:44 +10001035 xfree(obuf);
Ben Lindstromb5cdc662001-04-16 02:13:26 +00001036 if (bad_options > 0)
1037 fatal("%s: terminating, %d bad configuration options",
1038 filename, bad_options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001039}