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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"
Darren Tucker137e9c92004-08-13 21:30:24 +100013RCSID("$OpenBSD: servconf.c,v 1.137 2004/08/13 11:09:24 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 Lindstrom226cfa02001-01-22 05:34:40 +000029/* AF_UNSPEC or AF_INET or AF_INET6 */
30extern int IPv4or6;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000031/* Use of privilege separation or not */
32extern int use_privsep;
Ben Lindstrom226cfa02001-01-22 05:34:40 +000033
Damien Millerd4a8b7e1999-10-27 13:42:43 +100034/* Initializes the server options to their default values. */
35
Damien Miller4af51302000-04-16 11:18:38 +100036void
Damien Miller95def091999-11-25 00:26:21 +110037initialize_server_options(ServerOptions *options)
Damien Millerd4a8b7e1999-10-27 13:42:43 +100038{
Damien Miller95def091999-11-25 00:26:21 +110039 memset(options, 0, sizeof(*options));
Damien Miller726273e2001-11-12 11:40:11 +110040
41 /* Portable-specific options */
Damien Miller4e448a32003-05-14 15:11:48 +100042 options->use_pam = -1;
Damien Miller726273e2001-11-12 11:40:11 +110043
44 /* Standard Options */
Damien Miller34132e52000-01-14 15:45:46 +110045 options->num_ports = 0;
46 options->ports_from_cmdline = 0;
47 options->listen_addrs = NULL;
Damien Miller0bc1bd82000-11-13 22:57:25 +110048 options->num_host_key_files = 0;
Damien Miller6f83b8e2000-05-02 09:23:45 +100049 options->pid_file = NULL;
Damien Miller95def091999-11-25 00:26:21 +110050 options->server_key_bits = -1;
51 options->login_grace_time = -1;
52 options->key_regeneration_time = -1;
Ben Lindstromd8a90212001-02-15 03:08:27 +000053 options->permit_root_login = PERMIT_NOT_SET;
Damien Miller95def091999-11-25 00:26:21 +110054 options->ignore_rhosts = -1;
55 options->ignore_user_known_hosts = -1;
56 options->print_motd = -1;
Ben Lindstrom7bfff362001-03-26 05:45:53 +000057 options->print_lastlog = -1;
Damien Miller95def091999-11-25 00:26:21 +110058 options->x11_forwarding = -1;
59 options->x11_display_offset = -1;
Damien Miller95c249f2002-02-05 12:11:34 +110060 options->x11_use_localhost = -1;
Damien Millerd3a18572000-06-07 19:55:44 +100061 options->xauth_location = NULL;
Damien Miller95def091999-11-25 00:26:21 +110062 options->strict_modes = -1;
Damien Miller12c150e2003-12-17 16:31:10 +110063 options->tcp_keep_alive = -1;
Damien Millerfcd93202002-02-05 12:26:34 +110064 options->log_facility = SYSLOG_FACILITY_NOT_SET;
65 options->log_level = SYSLOG_LEVEL_NOT_SET;
Damien Miller95def091999-11-25 00:26:21 +110066 options->rhosts_rsa_authentication = -1;
Ben Lindstrom5eabda32001-04-12 23:34:34 +000067 options->hostbased_authentication = -1;
68 options->hostbased_uses_name_from_packet_only = -1;
Damien Miller95def091999-11-25 00:26:21 +110069 options->rsa_authentication = -1;
Damien Miller0bc1bd82000-11-13 22:57:25 +110070 options->pubkey_authentication = -1;
Damien Miller95def091999-11-25 00:26:21 +110071 options->kerberos_authentication = -1;
72 options->kerberos_or_local_passwd = -1;
73 options->kerberos_ticket_cleanup = -1;
Darren Tucker22ef5082003-12-31 11:37:34 +110074 options->kerberos_get_afs_token = -1;
Darren Tucker0efd1552003-08-26 11:49:55 +100075 options->gss_authentication=-1;
76 options->gss_cleanup_creds = -1;
Damien Miller95def091999-11-25 00:26:21 +110077 options->password_authentication = -1;
Damien Miller874d77b2000-10-14 16:23:11 +110078 options->kbd_interactive_authentication = -1;
Ben Lindstrom551ea372001-06-05 18:56:16 +000079 options->challenge_response_authentication = -1;
Damien Miller95def091999-11-25 00:26:21 +110080 options->permit_empty_passwd = -1;
Ben Lindstrom5d860f02002-08-01 01:28:38 +000081 options->permit_user_env = -1;
Damien Miller95def091999-11-25 00:26:21 +110082 options->use_login = -1;
Ben Lindstrom23e0f662002-06-21 01:09:47 +000083 options->compression = -1;
Damien Miller50a41ed2000-10-16 12:14:42 +110084 options->allow_tcp_forwarding = -1;
Damien Miller95def091999-11-25 00:26:21 +110085 options->num_allow_users = 0;
86 options->num_deny_users = 0;
87 options->num_allow_groups = 0;
88 options->num_deny_groups = 0;
Damien Miller78928792000-04-12 20:17:38 +100089 options->ciphers = NULL;
Ben Lindstrom06b33aa2001-02-15 03:01:59 +000090 options->macs = NULL;
Damien Miller78928792000-04-12 20:17:38 +100091 options->protocol = SSH_PROTO_UNKNOWN;
Damien Millere247cc42000-05-07 12:03:14 +100092 options->gateway_ports = -1;
Damien Millerf6d9e222000-06-18 14:50:44 +100093 options->num_subsystems = 0;
Damien Miller942da032000-08-18 13:59:06 +100094 options->max_startups_begin = -1;
95 options->max_startups_rate = -1;
Damien Miller37023962000-07-11 17:31:38 +100096 options->max_startups = -1;
Darren Tucker89413db2004-05-24 10:36:23 +100097 options->max_authtries = -1;
Ben Lindstrom48bd7c12001-01-09 00:35:42 +000098 options->banner = NULL;
Damien Miller3a961dc2003-06-03 10:25:48 +100099 options->use_dns = -1;
Ben Lindstrom5744dc42001-04-13 23:28:01 +0000100 options->client_alive_interval = -1;
101 options->client_alive_count_max = -1;
Ben Lindstrombfb3a0e2001-06-05 20:25:05 +0000102 options->authorized_keys_file = NULL;
103 options->authorized_keys_file2 = NULL;
Darren Tucker46bc0752004-05-02 22:11:30 +1000104 options->num_accept_env = 0;
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)
205 options->compression = 1;
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;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000233
Ben Lindstromfb62a692002-06-06 19:47:11 +0000234 /* Turn privilege separation on by default */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000235 if (use_privsep == -1)
Ben Lindstromfb62a692002-06-06 19:47:11 +0000236 use_privsep = 1;
Damien Miller4903eb42002-06-21 16:20:44 +1000237
Tim Rice40017b02002-07-14 13:36:49 -0700238#ifndef HAVE_MMAP
Damien Miller4903eb42002-06-21 16:20:44 +1000239 if (use_privsep && options->compression == 1) {
240 error("This platform does not support both privilege "
241 "separation and compression");
242 error("Compression disabled");
243 options->compression = 0;
244 }
245#endif
246
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000247}
248
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000249/* Keyword tokens. */
Damien Miller95def091999-11-25 00:26:21 +1100250typedef enum {
251 sBadOption, /* == unknown option */
Damien Miller726273e2001-11-12 11:40:11 +1100252 /* Portable-specific options */
Damien Miller4e448a32003-05-14 15:11:48 +1000253 sUsePAM,
Damien Miller726273e2001-11-12 11:40:11 +1100254 /* Standard Options */
Damien Miller95def091999-11-25 00:26:21 +1100255 sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime,
256 sPermitRootLogin, sLogFacility, sLogLevel,
Darren Tuckerec960f22003-08-13 20:37:05 +1000257 sRhostsRSAAuthentication, sRSAAuthentication,
Damien Miller95def091999-11-25 00:26:21 +1100258 sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup,
Darren Tucker22ef5082003-12-31 11:37:34 +1100259 sKerberosGetAFSToken,
Darren Tucker6aaa58c2003-08-02 22:24:49 +1000260 sKerberosTgtPassing, sChallengeResponseAuthentication,
Damien Miller874d77b2000-10-14 16:23:11 +1100261 sPasswordAuthentication, sKbdInteractiveAuthentication, sListenAddress,
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 },
338 { "printmotd", sPrintMotd },
Ben Lindstrom7bfff362001-03-26 05:45:53 +0000339 { "printlastlog", sPrintLastLog },
Damien Miller95def091999-11-25 00:26:21 +1100340 { "ignorerhosts", sIgnoreRhosts },
341 { "ignoreuserknownhosts", sIgnoreUserKnownHosts },
342 { "x11forwarding", sX11Forwarding },
343 { "x11displayoffset", sX11DisplayOffset },
Damien Miller95c249f2002-02-05 12:11:34 +1100344 { "x11uselocalhost", sX11UseLocalhost },
Damien Millerd3a18572000-06-07 19:55:44 +1000345 { "xauthlocation", sXAuthLocation },
Damien Miller95def091999-11-25 00:26:21 +1100346 { "strictmodes", sStrictModes },
347 { "permitemptypasswords", sEmptyPasswd },
Ben Lindstrom5d860f02002-08-01 01:28:38 +0000348 { "permituserenvironment", sPermitUserEnvironment },
Damien Miller95def091999-11-25 00:26:21 +1100349 { "uselogin", sUseLogin },
Ben Lindstrom23e0f662002-06-21 01:09:47 +0000350 { "compression", sCompression },
Damien Miller12c150e2003-12-17 16:31:10 +1100351 { "tcpkeepalive", sTCPKeepAlive },
352 { "keepalive", sTCPKeepAlive }, /* obsolete alias */
Damien Miller50a41ed2000-10-16 12:14:42 +1100353 { "allowtcpforwarding", sAllowTcpForwarding },
Damien Miller95def091999-11-25 00:26:21 +1100354 { "allowusers", sAllowUsers },
355 { "denyusers", sDenyUsers },
356 { "allowgroups", sAllowGroups },
357 { "denygroups", sDenyGroups },
Damien Miller78928792000-04-12 20:17:38 +1000358 { "ciphers", sCiphers },
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000359 { "macs", sMacs },
Damien Miller78928792000-04-12 20:17:38 +1000360 { "protocol", sProtocol },
Damien Millere247cc42000-05-07 12:03:14 +1000361 { "gatewayports", sGatewayPorts },
Damien Millerf6d9e222000-06-18 14:50:44 +1000362 { "subsystem", sSubsystem },
Damien Miller37023962000-07-11 17:31:38 +1000363 { "maxstartups", sMaxStartups },
Darren Tucker89413db2004-05-24 10:36:23 +1000364 { "maxauthtries", sMaxAuthTries },
Ben Lindstrom48bd7c12001-01-09 00:35:42 +0000365 { "banner", sBanner },
Damien Miller3a961dc2003-06-03 10:25:48 +1000366 { "usedns", sUseDNS },
367 { "verifyreversemapping", sDeprecated },
368 { "reversemappingcheck", sDeprecated },
Ben Lindstrom5744dc42001-04-13 23:28:01 +0000369 { "clientaliveinterval", sClientAliveInterval },
370 { "clientalivecountmax", sClientAliveCountMax },
Ben Lindstrombfb3a0e2001-06-05 20:25:05 +0000371 { "authorizedkeysfile", sAuthorizedKeysFile },
372 { "authorizedkeysfile2", sAuthorizedKeysFile2 },
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000373 { "useprivilegeseparation", sUsePrivilegeSeparation},
Darren Tucker46bc0752004-05-02 22:11:30 +1000374 { "acceptenv", sAcceptEnv },
Ben Lindstrom65366a82001-12-06 16:32:47 +0000375 { NULL, sBadOption }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000376};
377
Damien Miller5428f641999-11-25 11:54:57 +1100378/*
Ben Lindstrom3704c262001-04-02 18:20:03 +0000379 * Returns the number of the token pointed to by cp or sBadOption.
Damien Miller5428f641999-11-25 11:54:57 +1100380 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000381
Damien Miller4af51302000-04-16 11:18:38 +1000382static ServerOpCodes
Damien Miller95def091999-11-25 00:26:21 +1100383parse_token(const char *cp, const char *filename,
384 int linenum)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000385{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000386 u_int i;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000387
Damien Miller95def091999-11-25 00:26:21 +1100388 for (i = 0; keywords[i].name; i++)
Damien Miller5428f641999-11-25 11:54:57 +1100389 if (strcasecmp(cp, keywords[i].name) == 0)
Damien Miller95def091999-11-25 00:26:21 +1100390 return keywords[i].opcode;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000391
Ben Lindstromb5cdc662001-04-16 02:13:26 +0000392 error("%s: line %d: Bad configuration option: %s",
393 filename, linenum, cp);
Damien Miller95def091999-11-25 00:26:21 +1100394 return sBadOption;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000395}
396
Ben Lindstrombba81212001-06-25 05:01:22 +0000397static void
Ben Lindstrom19066a12001-04-12 23:39:26 +0000398add_listen_addr(ServerOptions *options, char *addr, u_short port)
Damien Miller34132e52000-01-14 15:45:46 +1100399{
Damien Miller34132e52000-01-14 15:45:46 +1100400 int i;
401
402 if (options->num_ports == 0)
403 options->ports[options->num_ports++] = SSH_DEFAULT_PORT;
Ben Lindstrom19066a12001-04-12 23:39:26 +0000404 if (port == 0)
Ben Lindstromc510af42001-04-07 17:25:48 +0000405 for (i = 0; i < options->num_ports; i++)
406 add_one_listen_addr(options, addr, options->ports[i]);
407 else
Ben Lindstrom19066a12001-04-12 23:39:26 +0000408 add_one_listen_addr(options, addr, port);
Ben Lindstromc510af42001-04-07 17:25:48 +0000409}
410
Ben Lindstrombba81212001-06-25 05:01:22 +0000411static void
Ben Lindstromc510af42001-04-07 17:25:48 +0000412add_one_listen_addr(ServerOptions *options, char *addr, u_short port)
413{
414 struct addrinfo hints, *ai, *aitop;
415 char strport[NI_MAXSERV];
416 int gaierr;
417
418 memset(&hints, 0, sizeof(hints));
419 hints.ai_family = IPv4or6;
420 hints.ai_socktype = SOCK_STREAM;
421 hints.ai_flags = (addr == NULL) ? AI_PASSIVE : 0;
Ben Lindstrome1353632002-06-23 21:29:23 +0000422 snprintf(strport, sizeof strport, "%u", port);
Ben Lindstromc510af42001-04-07 17:25:48 +0000423 if ((gaierr = getaddrinfo(addr, strport, &hints, &aitop)) != 0)
424 fatal("bad addr or host: %s (%s)",
425 addr ? addr : "<NULL>",
426 gai_strerror(gaierr));
427 for (ai = aitop; ai->ai_next; ai = ai->ai_next)
428 ;
429 ai->ai_next = options->listen_addrs;
430 options->listen_addrs = aitop;
Damien Miller34132e52000-01-14 15:45:46 +1100431}
432
Ben Lindstromade03f62001-12-06 18:22:17 +0000433int
434process_server_config_line(ServerOptions *options, char *line,
435 const char *filename, int linenum)
436{
437 char *cp, **charptr, *arg, *p;
Ben Lindstrome1353632002-06-23 21:29:23 +0000438 int *intptr, value, i, n;
Ben Lindstromade03f62001-12-06 18:22:17 +0000439 ServerOpCodes opcode;
Ben Lindstromade03f62001-12-06 18:22:17 +0000440
441 cp = line;
442 arg = strdelim(&cp);
443 /* Ignore leading whitespace */
444 if (*arg == '\0')
445 arg = strdelim(&cp);
446 if (!arg || !*arg || *arg == '#')
447 return 0;
448 intptr = NULL;
449 charptr = NULL;
450 opcode = parse_token(arg, filename, linenum);
451 switch (opcode) {
452 /* Portable-specific options */
Damien Miller4e448a32003-05-14 15:11:48 +1000453 case sUsePAM:
454 intptr = &options->use_pam;
Ben Lindstromade03f62001-12-06 18:22:17 +0000455 goto parse_flag;
456
457 /* Standard Options */
458 case sBadOption:
459 return -1;
460 case sPort:
461 /* ignore ports from configfile if cmdline specifies ports */
462 if (options->ports_from_cmdline)
463 return 0;
464 if (options->listen_addrs != NULL)
465 fatal("%s line %d: ports must be specified before "
Damien Miller4fbf08a2002-01-22 23:35:09 +1100466 "ListenAddress.", filename, linenum);
Ben Lindstromade03f62001-12-06 18:22:17 +0000467 if (options->num_ports >= MAX_PORTS)
468 fatal("%s line %d: too many ports.",
469 filename, linenum);
470 arg = strdelim(&cp);
471 if (!arg || *arg == '\0')
472 fatal("%s line %d: missing port number.",
473 filename, linenum);
474 options->ports[options->num_ports++] = a2port(arg);
475 if (options->ports[options->num_ports-1] == 0)
476 fatal("%s line %d: Badly formatted port number.",
477 filename, linenum);
478 break;
479
480 case sServerKeyBits:
481 intptr = &options->server_key_bits;
482parse_int:
483 arg = strdelim(&cp);
484 if (!arg || *arg == '\0')
485 fatal("%s line %d: missing integer value.",
486 filename, linenum);
487 value = atoi(arg);
488 if (*intptr == -1)
489 *intptr = value;
490 break;
491
492 case sLoginGraceTime:
493 intptr = &options->login_grace_time;
494parse_time:
495 arg = strdelim(&cp);
496 if (!arg || *arg == '\0')
497 fatal("%s line %d: missing time value.",
498 filename, linenum);
499 if ((value = convtime(arg)) == -1)
500 fatal("%s line %d: invalid time value.",
501 filename, linenum);
502 if (*intptr == -1)
503 *intptr = value;
504 break;
505
506 case sKeyRegenerationTime:
507 intptr = &options->key_regeneration_time;
508 goto parse_time;
509
510 case sListenAddress:
511 arg = strdelim(&cp);
512 if (!arg || *arg == '\0' || strncmp(arg, "[]", 2) == 0)
513 fatal("%s line %d: missing inet addr.",
514 filename, linenum);
515 if (*arg == '[') {
516 if ((p = strchr(arg, ']')) == NULL)
517 fatal("%s line %d: bad ipv6 inet addr usage.",
518 filename, linenum);
519 arg++;
520 memmove(p, p+1, strlen(p+1)+1);
521 } else if (((p = strchr(arg, ':')) == NULL) ||
522 (strchr(p+1, ':') != NULL)) {
523 add_listen_addr(options, arg, 0);
524 break;
525 }
526 if (*p == ':') {
527 u_short port;
528
529 p++;
530 if (*p == '\0')
531 fatal("%s line %d: bad inet addr:port usage.",
532 filename, linenum);
533 else {
534 *(p-1) = '\0';
535 if ((port = a2port(p)) == 0)
536 fatal("%s line %d: bad port number.",
537 filename, linenum);
538 add_listen_addr(options, arg, port);
539 }
540 } else if (*p == '\0')
541 add_listen_addr(options, arg, 0);
542 else
543 fatal("%s line %d: bad inet addr usage.",
544 filename, linenum);
545 break;
546
547 case sHostKeyFile:
548 intptr = &options->num_host_key_files;
549 if (*intptr >= MAX_HOSTKEYS)
550 fatal("%s line %d: too many host keys specified (max %d).",
551 filename, linenum, MAX_HOSTKEYS);
552 charptr = &options->host_key_files[*intptr];
553parse_filename:
554 arg = strdelim(&cp);
555 if (!arg || *arg == '\0')
556 fatal("%s line %d: missing file name.",
557 filename, linenum);
558 if (*charptr == NULL) {
559 *charptr = tilde_expand_filename(arg, getuid());
560 /* increase optional counter */
561 if (intptr != NULL)
562 *intptr = *intptr + 1;
563 }
564 break;
565
566 case sPidFile:
567 charptr = &options->pid_file;
568 goto parse_filename;
569
570 case sPermitRootLogin:
571 intptr = &options->permit_root_login;
572 arg = strdelim(&cp);
573 if (!arg || *arg == '\0')
574 fatal("%s line %d: missing yes/"
575 "without-password/forced-commands-only/no "
576 "argument.", filename, linenum);
577 value = 0; /* silence compiler */
578 if (strcmp(arg, "without-password") == 0)
579 value = PERMIT_NO_PASSWD;
580 else if (strcmp(arg, "forced-commands-only") == 0)
581 value = PERMIT_FORCED_ONLY;
582 else if (strcmp(arg, "yes") == 0)
583 value = PERMIT_YES;
584 else if (strcmp(arg, "no") == 0)
585 value = PERMIT_NO;
586 else
587 fatal("%s line %d: Bad yes/"
588 "without-password/forced-commands-only/no "
589 "argument: %s", filename, linenum, arg);
590 if (*intptr == -1)
591 *intptr = value;
592 break;
593
594 case sIgnoreRhosts:
595 intptr = &options->ignore_rhosts;
596parse_flag:
597 arg = strdelim(&cp);
598 if (!arg || *arg == '\0')
599 fatal("%s line %d: missing yes/no argument.",
600 filename, linenum);
601 value = 0; /* silence compiler */
602 if (strcmp(arg, "yes") == 0)
603 value = 1;
604 else if (strcmp(arg, "no") == 0)
605 value = 0;
606 else
607 fatal("%s line %d: Bad yes/no argument: %s",
608 filename, linenum, arg);
609 if (*intptr == -1)
610 *intptr = value;
611 break;
612
613 case sIgnoreUserKnownHosts:
614 intptr = &options->ignore_user_known_hosts;
615 goto parse_flag;
616
Ben Lindstromade03f62001-12-06 18:22:17 +0000617 case sRhostsRSAAuthentication:
618 intptr = &options->rhosts_rsa_authentication;
619 goto parse_flag;
620
621 case sHostbasedAuthentication:
622 intptr = &options->hostbased_authentication;
623 goto parse_flag;
624
625 case sHostbasedUsesNameFromPacketOnly:
626 intptr = &options->hostbased_uses_name_from_packet_only;
627 goto parse_flag;
628
629 case sRSAAuthentication:
630 intptr = &options->rsa_authentication;
631 goto parse_flag;
632
633 case sPubkeyAuthentication:
634 intptr = &options->pubkey_authentication;
635 goto parse_flag;
Damien Miller2aa0ab42003-05-15 12:05:28 +1000636
Ben Lindstromade03f62001-12-06 18:22:17 +0000637 case sKerberosAuthentication:
638 intptr = &options->kerberos_authentication;
639 goto parse_flag;
640
641 case sKerberosOrLocalPasswd:
642 intptr = &options->kerberos_or_local_passwd;
643 goto parse_flag;
644
645 case sKerberosTicketCleanup:
646 intptr = &options->kerberos_ticket_cleanup;
647 goto parse_flag;
Damien Miller2aa0ab42003-05-15 12:05:28 +1000648
Darren Tucker22ef5082003-12-31 11:37:34 +1100649 case sKerberosGetAFSToken:
650 intptr = &options->kerberos_get_afs_token;
651 goto parse_flag;
652
Darren Tucker0efd1552003-08-26 11:49:55 +1000653 case sGssAuthentication:
654 intptr = &options->gss_authentication;
655 goto parse_flag;
656
657 case sGssCleanupCreds:
658 intptr = &options->gss_cleanup_creds;
659 goto parse_flag;
660
Ben Lindstromade03f62001-12-06 18:22:17 +0000661 case sPasswordAuthentication:
662 intptr = &options->password_authentication;
663 goto parse_flag;
664
665 case sKbdInteractiveAuthentication:
666 intptr = &options->kbd_interactive_authentication;
667 goto parse_flag;
668
669 case sChallengeResponseAuthentication:
670 intptr = &options->challenge_response_authentication;
671 goto parse_flag;
672
673 case sPrintMotd:
674 intptr = &options->print_motd;
675 goto parse_flag;
676
677 case sPrintLastLog:
678 intptr = &options->print_lastlog;
679 goto parse_flag;
680
681 case sX11Forwarding:
682 intptr = &options->x11_forwarding;
683 goto parse_flag;
684
685 case sX11DisplayOffset:
686 intptr = &options->x11_display_offset;
687 goto parse_int;
688
Damien Miller95c249f2002-02-05 12:11:34 +1100689 case sX11UseLocalhost:
690 intptr = &options->x11_use_localhost;
691 goto parse_flag;
692
Ben Lindstromade03f62001-12-06 18:22:17 +0000693 case sXAuthLocation:
694 charptr = &options->xauth_location;
695 goto parse_filename;
696
697 case sStrictModes:
698 intptr = &options->strict_modes;
699 goto parse_flag;
700
Damien Miller12c150e2003-12-17 16:31:10 +1100701 case sTCPKeepAlive:
702 intptr = &options->tcp_keep_alive;
Ben Lindstromade03f62001-12-06 18:22:17 +0000703 goto parse_flag;
704
705 case sEmptyPasswd:
706 intptr = &options->permit_empty_passwd;
707 goto parse_flag;
708
Ben Lindstrom5d860f02002-08-01 01:28:38 +0000709 case sPermitUserEnvironment:
710 intptr = &options->permit_user_env;
711 goto parse_flag;
712
Ben Lindstromade03f62001-12-06 18:22:17 +0000713 case sUseLogin:
714 intptr = &options->use_login;
715 goto parse_flag;
716
Ben Lindstrom23e0f662002-06-21 01:09:47 +0000717 case sCompression:
718 intptr = &options->compression;
719 goto parse_flag;
720
Ben Lindstromade03f62001-12-06 18:22:17 +0000721 case sGatewayPorts:
722 intptr = &options->gateway_ports;
723 goto parse_flag;
724
Damien Miller3a961dc2003-06-03 10:25:48 +1000725 case sUseDNS:
726 intptr = &options->use_dns;
Ben Lindstromade03f62001-12-06 18:22:17 +0000727 goto parse_flag;
728
729 case sLogFacility:
730 intptr = (int *) &options->log_facility;
731 arg = strdelim(&cp);
732 value = log_facility_number(arg);
Damien Millerfcd93202002-02-05 12:26:34 +1100733 if (value == SYSLOG_FACILITY_NOT_SET)
Ben Lindstromade03f62001-12-06 18:22:17 +0000734 fatal("%.200s line %d: unsupported log facility '%s'",
735 filename, linenum, arg ? arg : "<NONE>");
736 if (*intptr == -1)
737 *intptr = (SyslogFacility) value;
738 break;
739
740 case sLogLevel:
741 intptr = (int *) &options->log_level;
742 arg = strdelim(&cp);
743 value = log_level_number(arg);
Damien Millerfcd93202002-02-05 12:26:34 +1100744 if (value == SYSLOG_LEVEL_NOT_SET)
Ben Lindstromade03f62001-12-06 18:22:17 +0000745 fatal("%.200s line %d: unsupported log level '%s'",
746 filename, linenum, arg ? arg : "<NONE>");
747 if (*intptr == -1)
748 *intptr = (LogLevel) value;
749 break;
750
751 case sAllowTcpForwarding:
752 intptr = &options->allow_tcp_forwarding;
753 goto parse_flag;
754
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000755 case sUsePrivilegeSeparation:
756 intptr = &use_privsep;
757 goto parse_flag;
758
Ben Lindstromade03f62001-12-06 18:22:17 +0000759 case sAllowUsers:
760 while ((arg = strdelim(&cp)) && *arg != '\0') {
761 if (options->num_allow_users >= MAX_ALLOW_USERS)
762 fatal("%s line %d: too many allow users.",
763 filename, linenum);
Ben Lindstrome1353632002-06-23 21:29:23 +0000764 options->allow_users[options->num_allow_users++] =
765 xstrdup(arg);
Ben Lindstromade03f62001-12-06 18:22:17 +0000766 }
767 break;
768
769 case sDenyUsers:
770 while ((arg = strdelim(&cp)) && *arg != '\0') {
771 if (options->num_deny_users >= MAX_DENY_USERS)
772 fatal( "%s line %d: too many deny users.",
773 filename, linenum);
Ben Lindstrome1353632002-06-23 21:29:23 +0000774 options->deny_users[options->num_deny_users++] =
775 xstrdup(arg);
Ben Lindstromade03f62001-12-06 18:22:17 +0000776 }
777 break;
778
779 case sAllowGroups:
780 while ((arg = strdelim(&cp)) && *arg != '\0') {
781 if (options->num_allow_groups >= MAX_ALLOW_GROUPS)
782 fatal("%s line %d: too many allow groups.",
783 filename, linenum);
Ben Lindstrome1353632002-06-23 21:29:23 +0000784 options->allow_groups[options->num_allow_groups++] =
785 xstrdup(arg);
Ben Lindstromade03f62001-12-06 18:22:17 +0000786 }
787 break;
788
789 case sDenyGroups:
790 while ((arg = strdelim(&cp)) && *arg != '\0') {
791 if (options->num_deny_groups >= MAX_DENY_GROUPS)
792 fatal("%s line %d: too many deny groups.",
793 filename, linenum);
794 options->deny_groups[options->num_deny_groups++] = xstrdup(arg);
795 }
796 break;
797
798 case sCiphers:
799 arg = strdelim(&cp);
800 if (!arg || *arg == '\0')
801 fatal("%s line %d: Missing argument.", filename, linenum);
802 if (!ciphers_valid(arg))
803 fatal("%s line %d: Bad SSH2 cipher spec '%s'.",
804 filename, linenum, arg ? arg : "<NONE>");
805 if (options->ciphers == NULL)
806 options->ciphers = xstrdup(arg);
807 break;
808
809 case sMacs:
810 arg = strdelim(&cp);
811 if (!arg || *arg == '\0')
812 fatal("%s line %d: Missing argument.", filename, linenum);
813 if (!mac_valid(arg))
814 fatal("%s line %d: Bad SSH2 mac spec '%s'.",
815 filename, linenum, arg ? arg : "<NONE>");
816 if (options->macs == NULL)
817 options->macs = xstrdup(arg);
818 break;
819
820 case sProtocol:
821 intptr = &options->protocol;
822 arg = strdelim(&cp);
823 if (!arg || *arg == '\0')
824 fatal("%s line %d: Missing argument.", filename, linenum);
825 value = proto_spec(arg);
826 if (value == SSH_PROTO_UNKNOWN)
827 fatal("%s line %d: Bad protocol spec '%s'.",
Damien Miller9f0f5c62001-12-21 14:45:46 +1100828 filename, linenum, arg ? arg : "<NONE>");
Ben Lindstromade03f62001-12-06 18:22:17 +0000829 if (*intptr == SSH_PROTO_UNKNOWN)
830 *intptr = value;
831 break;
832
833 case sSubsystem:
834 if (options->num_subsystems >= MAX_SUBSYSTEMS) {
835 fatal("%s line %d: too many subsystems defined.",
Damien Miller9f0f5c62001-12-21 14:45:46 +1100836 filename, linenum);
Ben Lindstromade03f62001-12-06 18:22:17 +0000837 }
838 arg = strdelim(&cp);
839 if (!arg || *arg == '\0')
840 fatal("%s line %d: Missing subsystem name.",
Damien Miller9f0f5c62001-12-21 14:45:46 +1100841 filename, linenum);
Ben Lindstromade03f62001-12-06 18:22:17 +0000842 for (i = 0; i < options->num_subsystems; i++)
843 if (strcmp(arg, options->subsystem_name[i]) == 0)
844 fatal("%s line %d: Subsystem '%s' already defined.",
Damien Miller9f0f5c62001-12-21 14:45:46 +1100845 filename, linenum, arg);
Ben Lindstromade03f62001-12-06 18:22:17 +0000846 options->subsystem_name[options->num_subsystems] = xstrdup(arg);
847 arg = strdelim(&cp);
848 if (!arg || *arg == '\0')
849 fatal("%s line %d: Missing subsystem command.",
Damien Miller9f0f5c62001-12-21 14:45:46 +1100850 filename, linenum);
Ben Lindstromade03f62001-12-06 18:22:17 +0000851 options->subsystem_command[options->num_subsystems] = xstrdup(arg);
852 options->num_subsystems++;
853 break;
854
855 case sMaxStartups:
856 arg = strdelim(&cp);
857 if (!arg || *arg == '\0')
858 fatal("%s line %d: Missing MaxStartups spec.",
Damien Miller9f0f5c62001-12-21 14:45:46 +1100859 filename, linenum);
Ben Lindstromade03f62001-12-06 18:22:17 +0000860 if ((n = sscanf(arg, "%d:%d:%d",
861 &options->max_startups_begin,
862 &options->max_startups_rate,
863 &options->max_startups)) == 3) {
864 if (options->max_startups_begin >
865 options->max_startups ||
866 options->max_startups_rate > 100 ||
867 options->max_startups_rate < 1)
868 fatal("%s line %d: Illegal MaxStartups spec.",
869 filename, linenum);
870 } else if (n != 1)
871 fatal("%s line %d: Illegal MaxStartups spec.",
872 filename, linenum);
873 else
874 options->max_startups = options->max_startups_begin;
875 break;
876
Darren Tucker89413db2004-05-24 10:36:23 +1000877 case sMaxAuthTries:
878 intptr = &options->max_authtries;
879 goto parse_int;
880
Ben Lindstromade03f62001-12-06 18:22:17 +0000881 case sBanner:
882 charptr = &options->banner;
883 goto parse_filename;
884 /*
885 * These options can contain %X options expanded at
886 * connect time, so that you can specify paths like:
887 *
888 * AuthorizedKeysFile /etc/ssh_keys/%u
889 */
890 case sAuthorizedKeysFile:
891 case sAuthorizedKeysFile2:
892 charptr = (opcode == sAuthorizedKeysFile ) ?
893 &options->authorized_keys_file :
894 &options->authorized_keys_file2;
895 goto parse_filename;
896
897 case sClientAliveInterval:
898 intptr = &options->client_alive_interval;
899 goto parse_time;
900
901 case sClientAliveCountMax:
902 intptr = &options->client_alive_count_max;
903 goto parse_int;
904
Darren Tucker46bc0752004-05-02 22:11:30 +1000905 case sAcceptEnv:
906 while ((arg = strdelim(&cp)) && *arg != '\0') {
907 if (strchr(arg, '=') != NULL)
908 fatal("%s line %d: Invalid environment name.",
909 filename, linenum);
910 if (options->num_accept_env >= MAX_ACCEPT_ENV)
911 fatal("%s line %d: too many allow env.",
912 filename, linenum);
913 options->accept_env[options->num_accept_env++] =
914 xstrdup(arg);
915 }
916 break;
917
Ben Lindstromade03f62001-12-06 18:22:17 +0000918 case sDeprecated:
Damien Miller996acd22003-04-09 20:59:48 +1000919 logit("%s line %d: Deprecated option %s",
Ben Lindstromade03f62001-12-06 18:22:17 +0000920 filename, linenum, arg);
921 while (arg)
922 arg = strdelim(&cp);
923 break;
924
Damien Millerf9b3feb2003-05-16 11:38:32 +1000925 case sUnsupported:
926 logit("%s line %d: Unsupported option %s",
927 filename, linenum, arg);
928 while (arg)
929 arg = strdelim(&cp);
930 break;
931
Ben Lindstromade03f62001-12-06 18:22:17 +0000932 default:
933 fatal("%s line %d: Missing handler for opcode %s (%d)",
934 filename, linenum, arg, opcode);
935 }
936 if ((arg = strdelim(&cp)) != NULL && *arg != '\0')
937 fatal("%s line %d: garbage at end of line; \"%.200s\".",
938 filename, linenum, arg);
939 return 0;
940}
941
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000942/* Reads the server configuration file. */
943
Damien Miller4af51302000-04-16 11:18:38 +1000944void
Darren Tucker645ab752004-06-25 13:33:20 +1000945load_server_config(const char *filename, Buffer *conf)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000946{
Darren Tucker645ab752004-06-25 13:33:20 +1000947 char line[1024], *cp;
Ben Lindstrome1353632002-06-23 21:29:23 +0000948 FILE *f;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000949
Darren Tucker645ab752004-06-25 13:33:20 +1000950 debug2("%s: filename %s", __func__, filename);
951 if ((f = fopen(filename, "r")) == NULL) {
Damien Miller95def091999-11-25 00:26:21 +1100952 perror(filename);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000953 exit(1);
Damien Miller95def091999-11-25 00:26:21 +1100954 }
Darren Tucker645ab752004-06-25 13:33:20 +1000955 buffer_clear(conf);
Damien Miller95def091999-11-25 00:26:21 +1100956 while (fgets(line, sizeof(line), f)) {
Darren Tucker645ab752004-06-25 13:33:20 +1000957 /*
958 * Trim out comments and strip whitespace
Darren Tuckerfc959702004-07-17 16:12:08 +1000959 * NB - preserve newlines, they are needed to reproduce
Darren Tucker645ab752004-06-25 13:33:20 +1000960 * line numbers later for error messages
961 */
962 if ((cp = strchr(line, '#')) != NULL)
963 memcpy(cp, "\n", 2);
964 cp = line + strspn(line, " \t\r");
965
966 buffer_append(conf, cp, strlen(cp));
967 }
968 buffer_append(conf, "\0", 1);
969 fclose(f);
970 debug2("%s: done config len = %d", __func__, buffer_len(conf));
971}
972
973void
974parse_server_config(ServerOptions *options, const char *filename, Buffer *conf)
975{
976 int linenum, bad_options = 0;
Darren Tucker9fbac712004-08-12 22:41:44 +1000977 char *cp, *obuf, *cbuf;
Darren Tucker645ab752004-06-25 13:33:20 +1000978
979 debug2("%s: config %s len %d", __func__, filename, buffer_len(conf));
980
Darren Tucker9fbac712004-08-12 22:41:44 +1000981 obuf = cbuf = xstrdup(buffer_ptr(conf));
Darren Tucker137e9c92004-08-13 21:30:24 +1000982 linenum = 1;
Darren Tucker645ab752004-06-25 13:33:20 +1000983 while((cp = strsep(&cbuf, "\n")) != NULL) {
984 if (process_server_config_line(options, cp, filename,
985 linenum++) != 0)
Damien Miller95def091999-11-25 00:26:21 +1100986 bad_options++;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000987 }
Darren Tucker9fbac712004-08-12 22:41:44 +1000988 xfree(obuf);
Ben Lindstromb5cdc662001-04-16 02:13:26 +0000989 if (bad_options > 0)
990 fatal("%s: terminating, %d bad configuration options",
991 filename, bad_options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000992}