freebsd-dev/crypto/openssh/servconf.c

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/*
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
* All rights reserved
*
* As far as I am concerned, the code I have written for this software
* can be used freely for any purpose. Any derived versions of this
* software must be clearly marked as such, and if the derived work is
* incompatible with the protocol description in the RFC file, it must be
* called by a name other than "ssh" or "Secure Shell".
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*/
#include "includes.h"
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RCSID("$OpenBSD: servconf.c,v 1.137 2004/08/13 11:09:24 dtucker Exp $");
RCSID("$FreeBSD$");
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#include "ssh.h"
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#include "log.h"
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#include "servconf.h"
#include "xmalloc.h"
#include "compat.h"
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#include "pathnames.h"
#include "misc.h"
#include "cipher.h"
#include "kex.h"
#include "mac.h"
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static void add_listen_addr(ServerOptions *, char *, u_short);
static void add_one_listen_addr(ServerOptions *, char *, u_short);
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/* AF_UNSPEC or AF_INET or AF_INET6 */
extern int IPv4or6;
/* Use of privilege separation or not */
extern int use_privsep;
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/* Initializes the server options to their default values. */
void
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initialize_server_options(ServerOptions *options)
{
memset(options, 0, sizeof(*options));
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/* Portable-specific options */
options->use_pam = -1;
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/* Standard Options */
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options->num_ports = 0;
options->ports_from_cmdline = 0;
options->listen_addrs = NULL;
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options->num_host_key_files = 0;
options->pid_file = NULL;
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options->server_key_bits = -1;
options->login_grace_time = -1;
options->key_regeneration_time = -1;
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options->permit_root_login = PERMIT_NOT_SET;
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options->ignore_rhosts = -1;
options->ignore_user_known_hosts = -1;
options->print_motd = -1;
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options->print_lastlog = -1;
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options->x11_forwarding = -1;
options->x11_display_offset = -1;
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options->x11_use_localhost = -1;
options->xauth_location = NULL;
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options->strict_modes = -1;
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options->tcp_keep_alive = -1;
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options->log_facility = SYSLOG_FACILITY_NOT_SET;
options->log_level = SYSLOG_LEVEL_NOT_SET;
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options->rhosts_rsa_authentication = -1;
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options->hostbased_authentication = -1;
options->hostbased_uses_name_from_packet_only = -1;
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options->rsa_authentication = -1;
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options->pubkey_authentication = -1;
options->kerberos_authentication = -1;
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options->kerberos_or_local_passwd = -1;
options->kerberos_ticket_cleanup = -1;
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options->kerberos_get_afs_token = -1;
options->gss_authentication=-1;
options->gss_cleanup_creds = -1;
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options->password_authentication = -1;
options->kbd_interactive_authentication = -1;
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options->challenge_response_authentication = -1;
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options->permit_empty_passwd = -1;
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options->permit_user_env = -1;
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options->use_login = -1;
options->compression = -1;
options->allow_tcp_forwarding = -1;
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options->num_allow_users = 0;
options->num_deny_users = 0;
options->num_allow_groups = 0;
options->num_deny_groups = 0;
options->ciphers = NULL;
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options->macs = NULL;
options->protocol = SSH_PROTO_UNKNOWN;
options->gateway_ports = -1;
options->num_subsystems = 0;
options->max_startups_begin = -1;
options->max_startups_rate = -1;
options->max_startups = -1;
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options->max_authtries = -1;
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options->banner = NULL;
options->use_dns = -1;
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options->client_alive_interval = -1;
options->client_alive_count_max = -1;
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options->authorized_keys_file = NULL;
options->authorized_keys_file2 = NULL;
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options->num_accept_env = 0;
/* Needs to be accessable in many places */
use_privsep = -1;
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}
void
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fill_default_server_options(ServerOptions *options)
{
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/* Portable-specific options */
if (options->use_pam == -1)
options->use_pam = 1;
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/* Standard Options */
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if (options->protocol == SSH_PROTO_UNKNOWN)
options->protocol = SSH_PROTO_2;
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if (options->num_host_key_files == 0) {
/* fill default hostkeys for protocols */
if (options->protocol & SSH_PROTO_1)
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options->host_key_files[options->num_host_key_files++] =
_PATH_HOST_KEY_FILE;
if (options->protocol & SSH_PROTO_2) {
options->host_key_files[options->num_host_key_files++] =
_PATH_HOST_DSA_KEY_FILE;
}
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}
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if (options->num_ports == 0)
options->ports[options->num_ports++] = SSH_DEFAULT_PORT;
if (options->listen_addrs == NULL)
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add_listen_addr(options, NULL, 0);
if (options->pid_file == NULL)
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options->pid_file = _PATH_SSH_DAEMON_PID_FILE;
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if (options->server_key_bits == -1)
options->server_key_bits = 768;
if (options->login_grace_time == -1)
options->login_grace_time = 120;
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if (options->key_regeneration_time == -1)
options->key_regeneration_time = 3600;
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if (options->permit_root_login == PERMIT_NOT_SET)
options->permit_root_login = PERMIT_NO;
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if (options->ignore_rhosts == -1)
options->ignore_rhosts = 1;
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if (options->ignore_user_known_hosts == -1)
options->ignore_user_known_hosts = 0;
if (options->print_motd == -1)
options->print_motd = 1;
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if (options->print_lastlog == -1)
options->print_lastlog = 1;
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if (options->x11_forwarding == -1)
options->x11_forwarding = 1;
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if (options->x11_display_offset == -1)
options->x11_display_offset = 10;
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if (options->x11_use_localhost == -1)
options->x11_use_localhost = 1;
if (options->xauth_location == NULL)
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options->xauth_location = _PATH_XAUTH;
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if (options->strict_modes == -1)
options->strict_modes = 1;
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if (options->tcp_keep_alive == -1)
options->tcp_keep_alive = 1;
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if (options->log_facility == SYSLOG_FACILITY_NOT_SET)
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options->log_facility = SYSLOG_FACILITY_AUTH;
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if (options->log_level == SYSLOG_LEVEL_NOT_SET)
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options->log_level = SYSLOG_LEVEL_INFO;
if (options->rhosts_rsa_authentication == -1)
options->rhosts_rsa_authentication = 0;
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if (options->hostbased_authentication == -1)
options->hostbased_authentication = 0;
if (options->hostbased_uses_name_from_packet_only == -1)
options->hostbased_uses_name_from_packet_only = 0;
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if (options->rsa_authentication == -1)
options->rsa_authentication = 1;
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if (options->pubkey_authentication == -1)
options->pubkey_authentication = 1;
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if (options->kerberos_authentication == -1)
options->kerberos_authentication = 0;
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if (options->kerberos_or_local_passwd == -1)
options->kerberos_or_local_passwd = 1;
if (options->kerberos_ticket_cleanup == -1)
options->kerberos_ticket_cleanup = 1;
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if (options->kerberos_get_afs_token == -1)
options->kerberos_get_afs_token = 0;
if (options->gss_authentication == -1)
options->gss_authentication = 0;
if (options->gss_cleanup_creds == -1)
options->gss_cleanup_creds = 1;
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if (options->password_authentication == -1)
#ifdef USE_PAM
options->password_authentication = 0;
#else
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options->password_authentication = 1;
#endif
if (options->kbd_interactive_authentication == -1)
options->kbd_interactive_authentication = 0;
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if (options->challenge_response_authentication == -1)
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options->challenge_response_authentication = 1;
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if (options->permit_empty_passwd == -1)
options->permit_empty_passwd = 0;
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if (options->permit_user_env == -1)
options->permit_user_env = 0;
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if (options->use_login == -1)
options->use_login = 0;
if (options->compression == -1)
options->compression = 1;
if (options->allow_tcp_forwarding == -1)
options->allow_tcp_forwarding = 1;
if (options->gateway_ports == -1)
options->gateway_ports = 0;
if (options->max_startups == -1)
options->max_startups = 10;
if (options->max_startups_rate == -1)
options->max_startups_rate = 100; /* 100% */
if (options->max_startups_begin == -1)
options->max_startups_begin = options->max_startups;
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if (options->max_authtries == -1)
options->max_authtries = DEFAULT_AUTH_FAIL_MAX;
if (options->use_dns == -1)
options->use_dns = 1;
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if (options->client_alive_interval == -1)
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options->client_alive_interval = 0;
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if (options->client_alive_count_max == -1)
options->client_alive_count_max = 3;
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if (options->authorized_keys_file2 == NULL) {
/* authorized_keys_file2 falls back to authorized_keys_file */
if (options->authorized_keys_file != NULL)
options->authorized_keys_file2 = options->authorized_keys_file;
else
options->authorized_keys_file2 = _PATH_SSH_USER_PERMITTED_KEYS2;
}
if (options->authorized_keys_file == NULL)
options->authorized_keys_file = _PATH_SSH_USER_PERMITTED_KEYS;
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/* Turn privilege separation on by default */
if (use_privsep == -1)
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use_privsep = 1;
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#ifndef HAVE_MMAP
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if (use_privsep && options->compression == 1) {
error("This platform does not support both privilege "
"separation and compression");
error("Compression disabled");
options->compression = 0;
}
#endif
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}
/* Keyword tokens. */
typedef enum {
sBadOption, /* == unknown option */
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/* Portable-specific options */
sUsePAM,
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/* Standard Options */
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sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime,
sPermitRootLogin, sLogFacility, sLogLevel,
sRhostsRSAAuthentication, sRSAAuthentication,
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sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup,
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sKerberosGetAFSToken,
sKerberosTgtPassing, sChallengeResponseAuthentication,
sPasswordAuthentication, sKbdInteractiveAuthentication, sListenAddress,
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sPrintMotd, sPrintLastLog, sIgnoreRhosts,
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sX11Forwarding, sX11DisplayOffset, sX11UseLocalhost,
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sStrictModes, sEmptyPasswd, sTCPKeepAlive,
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sPermitUserEnvironment, sUseLogin, sAllowTcpForwarding, sCompression,
sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups,
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sIgnoreUserKnownHosts, sCiphers, sMacs, sProtocol, sPidFile,
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sGatewayPorts, sPubkeyAuthentication, sXAuthLocation, sSubsystem,
sMaxStartups, sMaxAuthTries,
sBanner, sUseDNS, sHostbasedAuthentication,
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sHostbasedUsesNameFromPacketOnly, sClientAliveInterval,
sClientAliveCountMax, sAuthorizedKeysFile, sAuthorizedKeysFile2,
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sGssAuthentication, sGssCleanupCreds, sAcceptEnv,
sUsePrivilegeSeparation,
sVersionAddendum,
sDeprecated, sUnsupported
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} ServerOpCodes;
/* Textual representation of the tokens. */
static struct {
const char *name;
ServerOpCodes opcode;
} keywords[] = {
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/* Portable-specific options */
#ifdef USE_PAM
{ "usepam", sUsePAM },
#else
{ "usepam", sUnsupported },
#endif
{ "pamauthenticationviakbdint", sDeprecated },
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/* Standard Options */
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{ "port", sPort },
{ "hostkey", sHostKeyFile },
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{ "hostdsakey", sHostKeyFile }, /* alias */
{ "pidfile", sPidFile },
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{ "serverkeybits", sServerKeyBits },
{ "logingracetime", sLoginGraceTime },
{ "keyregenerationinterval", sKeyRegenerationTime },
{ "permitrootlogin", sPermitRootLogin },
{ "syslogfacility", sLogFacility },
{ "loglevel", sLogLevel },
{ "rhostsauthentication", sDeprecated },
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{ "rhostsrsaauthentication", sRhostsRSAAuthentication },
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{ "hostbasedauthentication", sHostbasedAuthentication },
{ "hostbasedusesnamefrompacketonly", sHostbasedUsesNameFromPacketOnly },
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{ "rsaauthentication", sRSAAuthentication },
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{ "pubkeyauthentication", sPubkeyAuthentication },
{ "dsaauthentication", sPubkeyAuthentication }, /* alias */
#ifdef KRB5
{ "kerberosauthentication", sKerberosAuthentication },
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{ "kerberosorlocalpasswd", sKerberosOrLocalPasswd },
{ "kerberosticketcleanup", sKerberosTicketCleanup },
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#ifdef USE_AFS
{ "kerberosgetafstoken", sKerberosGetAFSToken },
#else
{ "kerberosgetafstoken", sUnsupported },
#endif
#else
{ "kerberosauthentication", sUnsupported },
{ "kerberosorlocalpasswd", sUnsupported },
{ "kerberosticketcleanup", sUnsupported },
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{ "kerberosgetafstoken", sUnsupported },
#endif
{ "kerberostgtpassing", sUnsupported },
{ "afstokenpassing", sUnsupported },
#ifdef GSSAPI
{ "gssapiauthentication", sGssAuthentication },
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{ "gssapicleanupcredentials", sGssCleanupCreds },
#else
{ "gssapiauthentication", sUnsupported },
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{ "gssapicleanupcredentials", sUnsupported },
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#endif
{ "passwordauthentication", sPasswordAuthentication },
{ "kbdinteractiveauthentication", sKbdInteractiveAuthentication },
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{ "challengeresponseauthentication", sChallengeResponseAuthentication },
{ "skeyauthentication", sChallengeResponseAuthentication }, /* alias */
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{ "checkmail", sDeprecated },
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{ "listenaddress", sListenAddress },
{ "printmotd", sPrintMotd },
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{ "printlastlog", sPrintLastLog },
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{ "ignorerhosts", sIgnoreRhosts },
{ "ignoreuserknownhosts", sIgnoreUserKnownHosts },
{ "x11forwarding", sX11Forwarding },
{ "x11displayoffset", sX11DisplayOffset },
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{ "x11uselocalhost", sX11UseLocalhost },
{ "xauthlocation", sXAuthLocation },
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{ "strictmodes", sStrictModes },
{ "permitemptypasswords", sEmptyPasswd },
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{ "permituserenvironment", sPermitUserEnvironment },
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{ "uselogin", sUseLogin },
{ "compression", sCompression },
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{ "tcpkeepalive", sTCPKeepAlive },
{ "keepalive", sTCPKeepAlive }, /* obsolete alias */
{ "allowtcpforwarding", sAllowTcpForwarding },
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{ "allowusers", sAllowUsers },
{ "denyusers", sDenyUsers },
{ "allowgroups", sAllowGroups },
{ "denygroups", sDenyGroups },
{ "ciphers", sCiphers },
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{ "macs", sMacs },
{ "protocol", sProtocol },
{ "gatewayports", sGatewayPorts },
{ "subsystem", sSubsystem },
{ "maxstartups", sMaxStartups },
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{ "maxauthtries", sMaxAuthTries },
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{ "banner", sBanner },
{ "usedns", sUseDNS },
{ "verifyreversemapping", sDeprecated },
{ "reversemappingcheck", sDeprecated },
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{ "clientaliveinterval", sClientAliveInterval },
{ "clientalivecountmax", sClientAliveCountMax },
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{ "authorizedkeysfile", sAuthorizedKeysFile },
{ "authorizedkeysfile2", sAuthorizedKeysFile2 },
{ "useprivilegeseparation", sUsePrivilegeSeparation},
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{ "acceptenv", sAcceptEnv },
{ "versionaddendum", sVersionAddendum },
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{ NULL, sBadOption }
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};
/*
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* Returns the number of the token pointed to by cp or sBadOption.
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*/
static ServerOpCodes
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parse_token(const char *cp, const char *filename,
int linenum)
{
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u_int i;
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for (i = 0; keywords[i].name; i++)
if (strcasecmp(cp, keywords[i].name) == 0)
return keywords[i].opcode;
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error("%s: line %d: Bad configuration option: %s",
filename, linenum, cp);
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return sBadOption;
}
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static void
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add_listen_addr(ServerOptions *options, char *addr, u_short port)
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{
int i;
if (options->num_ports == 0)
options->ports[options->num_ports++] = SSH_DEFAULT_PORT;
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if (port == 0)
for (i = 0; i < options->num_ports; i++)
add_one_listen_addr(options, addr, options->ports[i]);
else
add_one_listen_addr(options, addr, port);
}
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static void
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add_one_listen_addr(ServerOptions *options, char *addr, u_short port)
{
struct addrinfo hints, *ai, *aitop;
char strport[NI_MAXSERV];
int gaierr;
memset(&hints, 0, sizeof(hints));
hints.ai_family = IPv4or6;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = (addr == NULL) ? AI_PASSIVE : 0;
snprintf(strport, sizeof strport, "%u", port);
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if ((gaierr = getaddrinfo(addr, strport, &hints, &aitop)) != 0)
fatal("bad addr or host: %s (%s)",
addr ? addr : "<NULL>",
gai_strerror(gaierr));
for (ai = aitop; ai->ai_next; ai = ai->ai_next)
;
ai->ai_next = options->listen_addrs;
options->listen_addrs = aitop;
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}
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int
process_server_config_line(ServerOptions *options, char *line,
const char *filename, int linenum)
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{
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char *cp, **charptr, *arg, *p;
int *intptr, value, i, n;
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ServerOpCodes opcode;
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cp = line;
arg = strdelim(&cp);
/* Ignore leading whitespace */
if (*arg == '\0')
arg = strdelim(&cp);
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if (!arg || !*arg || *arg == '#')
return 0;
intptr = NULL;
charptr = NULL;
opcode = parse_token(arg, filename, linenum);
switch (opcode) {
2002-06-27 22:42:11 +00:00
/* Portable-specific options */
case sUsePAM:
intptr = &options->use_pam;
2002-06-27 22:42:11 +00:00
goto parse_flag;
/* Standard Options */
2002-03-18 10:09:43 +00:00
case sBadOption:
return -1;
case sPort:
/* ignore ports from configfile if cmdline specifies ports */
if (options->ports_from_cmdline)
return 0;
if (options->listen_addrs != NULL)
fatal("%s line %d: ports must be specified before "
"ListenAddress.", filename, linenum);
if (options->num_ports >= MAX_PORTS)
fatal("%s line %d: too many ports.",
filename, linenum);
arg = strdelim(&cp);
if (!arg || *arg == '\0')
fatal("%s line %d: missing port number.",
filename, linenum);
options->ports[options->num_ports++] = a2port(arg);
if (options->ports[options->num_ports-1] == 0)
fatal("%s line %d: Badly formatted port number.",
filename, linenum);
break;
case sServerKeyBits:
intptr = &options->server_key_bits;
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parse_int:
2002-03-18 10:09:43 +00:00
arg = strdelim(&cp);
if (!arg || *arg == '\0')
fatal("%s line %d: missing integer value.",
filename, linenum);
value = atoi(arg);
if (*intptr == -1)
*intptr = value;
break;
case sLoginGraceTime:
intptr = &options->login_grace_time;
parse_time:
arg = strdelim(&cp);
if (!arg || *arg == '\0')
fatal("%s line %d: missing time value.",
filename, linenum);
if ((value = convtime(arg)) == -1)
fatal("%s line %d: invalid time value.",
filename, linenum);
if (*intptr == -1)
*intptr = value;
break;
case sKeyRegenerationTime:
intptr = &options->key_regeneration_time;
goto parse_time;
case sListenAddress:
arg = strdelim(&cp);
if (!arg || *arg == '\0' || strncmp(arg, "[]", 2) == 0)
fatal("%s line %d: missing inet addr.",
filename, linenum);
if (*arg == '[') {
if ((p = strchr(arg, ']')) == NULL)
fatal("%s line %d: bad ipv6 inet addr usage.",
2001-05-04 04:14:23 +00:00
filename, linenum);
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arg++;
memmove(p, p+1, strlen(p+1)+1);
} else if (((p = strchr(arg, ':')) == NULL) ||
(strchr(p+1, ':') != NULL)) {
add_listen_addr(options, arg, 0);
2000-02-24 14:29:47 +00:00
break;
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}
if (*p == ':') {
u_short port;
2000-02-24 14:29:47 +00:00
2002-03-18 10:09:43 +00:00
p++;
if (*p == '\0')
fatal("%s line %d: bad inet addr:port usage.",
2001-05-04 04:14:23 +00:00
filename, linenum);
2002-03-18 10:09:43 +00:00
else {
*(p-1) = '\0';
if ((port = a2port(p)) == 0)
fatal("%s line %d: bad port number.",
2001-05-04 04:14:23 +00:00
filename, linenum);
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add_listen_addr(options, arg, port);
2001-05-04 04:14:23 +00:00
}
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} else if (*p == '\0')
add_listen_addr(options, arg, 0);
else
fatal("%s line %d: bad inet addr usage.",
filename, linenum);
break;
case sHostKeyFile:
intptr = &options->num_host_key_files;
if (*intptr >= MAX_HOSTKEYS)
fatal("%s line %d: too many host keys specified (max %d).",
filename, linenum, MAX_HOSTKEYS);
charptr = &options->host_key_files[*intptr];
parse_filename:
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arg = strdelim(&cp);
if (!arg || *arg == '\0')
fatal("%s line %d: missing file name.",
filename, linenum);
if (*charptr == NULL) {
*charptr = tilde_expand_filename(arg, getuid());
/* increase optional counter */
if (intptr != NULL)
*intptr = *intptr + 1;
}
break;
2000-02-24 14:29:47 +00:00
2002-03-18 10:09:43 +00:00
case sPidFile:
charptr = &options->pid_file;
goto parse_filename;
2000-02-24 14:29:47 +00:00
2002-03-18 10:09:43 +00:00
case sPermitRootLogin:
intptr = &options->permit_root_login;
arg = strdelim(&cp);
if (!arg || *arg == '\0')
fatal("%s line %d: missing yes/"
"without-password/forced-commands-only/no "
"argument.", filename, linenum);
value = 0; /* silence compiler */
if (strcmp(arg, "without-password") == 0)
value = PERMIT_NO_PASSWD;
else if (strcmp(arg, "forced-commands-only") == 0)
value = PERMIT_FORCED_ONLY;
else if (strcmp(arg, "yes") == 0)
value = PERMIT_YES;
else if (strcmp(arg, "no") == 0)
value = PERMIT_NO;
else
fatal("%s line %d: Bad yes/"
"without-password/forced-commands-only/no "
"argument: %s", filename, linenum, arg);
if (*intptr == -1)
*intptr = value;
break;
case sIgnoreRhosts:
intptr = &options->ignore_rhosts;
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parse_flag:
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arg = strdelim(&cp);
if (!arg || *arg == '\0')
fatal("%s line %d: missing yes/no argument.",
filename, linenum);
value = 0; /* silence compiler */
if (strcmp(arg, "yes") == 0)
value = 1;
else if (strcmp(arg, "no") == 0)
value = 0;
else
fatal("%s line %d: Bad yes/no argument: %s",
filename, linenum, arg);
if (*intptr == -1)
*intptr = value;
break;
case sIgnoreUserKnownHosts:
intptr = &options->ignore_user_known_hosts;
goto parse_flag;
case sRhostsRSAAuthentication:
intptr = &options->rhosts_rsa_authentication;
goto parse_flag;
case sHostbasedAuthentication:
intptr = &options->hostbased_authentication;
goto parse_flag;
case sHostbasedUsesNameFromPacketOnly:
intptr = &options->hostbased_uses_name_from_packet_only;
goto parse_flag;
case sRSAAuthentication:
intptr = &options->rsa_authentication;
goto parse_flag;
case sPubkeyAuthentication:
intptr = &options->pubkey_authentication;
goto parse_flag;
2002-03-18 10:09:43 +00:00
case sKerberosAuthentication:
intptr = &options->kerberos_authentication;
goto parse_flag;
2000-02-24 14:29:47 +00:00
2002-03-18 10:09:43 +00:00
case sKerberosOrLocalPasswd:
intptr = &options->kerberos_or_local_passwd;
goto parse_flag;
2002-03-18 10:09:43 +00:00
case sKerberosTicketCleanup:
intptr = &options->kerberos_ticket_cleanup;
goto parse_flag;
2004-02-26 10:52:33 +00:00
case sKerberosGetAFSToken:
intptr = &options->kerberos_get_afs_token;
goto parse_flag;
case sGssAuthentication:
intptr = &options->gss_authentication;
2002-03-18 10:09:43 +00:00
goto parse_flag;
case sGssCleanupCreds:
intptr = &options->gss_cleanup_creds;
2002-03-18 10:09:43 +00:00
goto parse_flag;
2000-02-24 14:29:47 +00:00
2002-03-18 10:09:43 +00:00
case sPasswordAuthentication:
intptr = &options->password_authentication;
goto parse_flag;
2000-02-24 14:29:47 +00:00
2002-03-18 10:09:43 +00:00
case sKbdInteractiveAuthentication:
intptr = &options->kbd_interactive_authentication;
goto parse_flag;
2000-02-24 14:29:47 +00:00
2002-03-18 10:09:43 +00:00
case sChallengeResponseAuthentication:
intptr = &options->challenge_response_authentication;
goto parse_flag;
2000-02-24 14:29:47 +00:00
2002-03-18 10:09:43 +00:00
case sPrintMotd:
intptr = &options->print_motd;
goto parse_flag;
2001-05-04 04:14:23 +00:00
2002-03-18 10:09:43 +00:00
case sPrintLastLog:
intptr = &options->print_lastlog;
goto parse_flag;
2000-02-24 14:29:47 +00:00
2002-03-18 10:09:43 +00:00
case sX11Forwarding:
intptr = &options->x11_forwarding;
goto parse_flag;
2000-02-24 14:29:47 +00:00
2002-03-18 10:09:43 +00:00
case sX11DisplayOffset:
intptr = &options->x11_display_offset;
goto parse_int;
2001-05-04 04:14:23 +00:00
2002-03-18 10:09:43 +00:00
case sX11UseLocalhost:
intptr = &options->x11_use_localhost;
goto parse_flag;
2000-02-24 14:29:47 +00:00
2002-03-18 10:09:43 +00:00
case sXAuthLocation:
charptr = &options->xauth_location;
goto parse_filename;
2000-02-24 14:29:47 +00:00
2002-03-18 10:09:43 +00:00
case sStrictModes:
intptr = &options->strict_modes;
goto parse_flag;
2000-02-24 14:29:47 +00:00
2004-02-26 10:52:33 +00:00
case sTCPKeepAlive:
intptr = &options->tcp_keep_alive;
2002-03-18 10:09:43 +00:00
goto parse_flag;
2000-02-24 14:29:47 +00:00
2002-03-18 10:09:43 +00:00
case sEmptyPasswd:
intptr = &options->permit_empty_passwd;
goto parse_flag;
2002-10-29 10:16:02 +00:00
case sPermitUserEnvironment:
intptr = &options->permit_user_env;
goto parse_flag;
2002-03-18 10:09:43 +00:00
case sUseLogin:
intptr = &options->use_login;
goto parse_flag;
2001-05-04 04:14:23 +00:00
case sCompression:
intptr = &options->compression;
goto parse_flag;
2002-03-18 10:09:43 +00:00
case sGatewayPorts:
intptr = &options->gateway_ports;
goto parse_flag;
2000-02-24 14:29:47 +00:00
case sUseDNS:
intptr = &options->use_dns;
2002-03-18 10:09:43 +00:00
goto parse_flag;
2002-03-18 10:09:43 +00:00
case sLogFacility:
intptr = (int *) &options->log_facility;
arg = strdelim(&cp);
value = log_facility_number(arg);
if (value == SYSLOG_FACILITY_NOT_SET)
fatal("%.200s line %d: unsupported log facility '%s'",
filename, linenum, arg ? arg : "<NONE>");
if (*intptr == -1)
*intptr = (SyslogFacility) value;
break;
case sLogLevel:
intptr = (int *) &options->log_level;
arg = strdelim(&cp);
value = log_level_number(arg);
if (value == SYSLOG_LEVEL_NOT_SET)
fatal("%.200s line %d: unsupported log level '%s'",
filename, linenum, arg ? arg : "<NONE>");
if (*intptr == -1)
*intptr = (LogLevel) value;
break;
case sAllowTcpForwarding:
intptr = &options->allow_tcp_forwarding;
goto parse_flag;
case sUsePrivilegeSeparation:
intptr = &use_privsep;
goto parse_flag;
2002-03-18 10:09:43 +00:00
case sAllowUsers:
while ((arg = strdelim(&cp)) && *arg != '\0') {
if (options->num_allow_users >= MAX_ALLOW_USERS)
fatal("%s line %d: too many allow users.",
filename, linenum);
options->allow_users[options->num_allow_users++] =
xstrdup(arg);
2002-03-18 10:09:43 +00:00
}
break;
2000-02-24 14:29:47 +00:00
2002-03-18 10:09:43 +00:00
case sDenyUsers:
while ((arg = strdelim(&cp)) && *arg != '\0') {
if (options->num_deny_users >= MAX_DENY_USERS)
fatal( "%s line %d: too many deny users.",
filename, linenum);
options->deny_users[options->num_deny_users++] =
xstrdup(arg);
2002-03-18 10:09:43 +00:00
}
break;
2000-02-24 14:29:47 +00:00
2002-03-18 10:09:43 +00:00
case sAllowGroups:
while ((arg = strdelim(&cp)) && *arg != '\0') {
if (options->num_allow_groups >= MAX_ALLOW_GROUPS)
fatal("%s line %d: too many allow groups.",
filename, linenum);
options->allow_groups[options->num_allow_groups++] =
xstrdup(arg);
2002-03-18 10:09:43 +00:00
}
break;
2002-03-18 10:09:43 +00:00
case sDenyGroups:
while ((arg = strdelim(&cp)) && *arg != '\0') {
if (options->num_deny_groups >= MAX_DENY_GROUPS)
fatal("%s line %d: too many deny groups.",
filename, linenum);
options->deny_groups[options->num_deny_groups++] = xstrdup(arg);
}
break;
2001-05-04 04:14:23 +00:00
2002-03-18 10:09:43 +00:00
case sCiphers:
arg = strdelim(&cp);
if (!arg || *arg == '\0')
fatal("%s line %d: Missing argument.", filename, linenum);
if (!ciphers_valid(arg))
fatal("%s line %d: Bad SSH2 cipher spec '%s'.",
filename, linenum, arg ? arg : "<NONE>");
if (options->ciphers == NULL)
options->ciphers = xstrdup(arg);
break;
case sMacs:
arg = strdelim(&cp);
if (!arg || *arg == '\0')
fatal("%s line %d: Missing argument.", filename, linenum);
if (!mac_valid(arg))
fatal("%s line %d: Bad SSH2 mac spec '%s'.",
filename, linenum, arg ? arg : "<NONE>");
if (options->macs == NULL)
options->macs = xstrdup(arg);
break;
case sProtocol:
intptr = &options->protocol;
arg = strdelim(&cp);
if (!arg || *arg == '\0')
fatal("%s line %d: Missing argument.", filename, linenum);
value = proto_spec(arg);
if (value == SSH_PROTO_UNKNOWN)
fatal("%s line %d: Bad protocol spec '%s'.",
filename, linenum, arg ? arg : "<NONE>");
if (*intptr == SSH_PROTO_UNKNOWN)
*intptr = value;
break;
case sSubsystem:
if (options->num_subsystems >= MAX_SUBSYSTEMS) {
fatal("%s line %d: too many subsystems defined.",
filename, linenum);
}
arg = strdelim(&cp);
if (!arg || *arg == '\0')
fatal("%s line %d: Missing subsystem name.",
filename, linenum);
for (i = 0; i < options->num_subsystems; i++)
if (strcmp(arg, options->subsystem_name[i]) == 0)
fatal("%s line %d: Subsystem '%s' already defined.",
filename, linenum, arg);
options->subsystem_name[options->num_subsystems] = xstrdup(arg);
arg = strdelim(&cp);
if (!arg || *arg == '\0')
fatal("%s line %d: Missing subsystem command.",
filename, linenum);
options->subsystem_command[options->num_subsystems] = xstrdup(arg);
options->num_subsystems++;
break;
case sMaxStartups:
arg = strdelim(&cp);
if (!arg || *arg == '\0')
fatal("%s line %d: Missing MaxStartups spec.",
filename, linenum);
if ((n = sscanf(arg, "%d:%d:%d",
&options->max_startups_begin,
&options->max_startups_rate,
&options->max_startups)) == 3) {
if (options->max_startups_begin >
options->max_startups ||
options->max_startups_rate > 100 ||
options->max_startups_rate < 1)
fatal("%s line %d: Illegal MaxStartups spec.",
filename, linenum);
} else if (n != 1)
fatal("%s line %d: Illegal MaxStartups spec.",
filename, linenum);
else
options->max_startups = options->max_startups_begin;
break;
2004-10-28 16:11:31 +00:00
case sMaxAuthTries:
intptr = &options->max_authtries;
goto parse_int;
2002-03-18 10:09:43 +00:00
case sBanner:
charptr = &options->banner;
goto parse_filename;
/*
* These options can contain %X options expanded at
* connect time, so that you can specify paths like:
*
* AuthorizedKeysFile /etc/ssh_keys/%u
*/
case sAuthorizedKeysFile:
case sAuthorizedKeysFile2:
charptr = (opcode == sAuthorizedKeysFile ) ?
&options->authorized_keys_file :
&options->authorized_keys_file2;
goto parse_filename;
case sClientAliveInterval:
intptr = &options->client_alive_interval;
goto parse_time;
case sClientAliveCountMax:
intptr = &options->client_alive_count_max;
goto parse_int;
2004-10-28 16:11:31 +00:00
case sAcceptEnv:
while ((arg = strdelim(&cp)) && *arg != '\0') {
if (strchr(arg, '=') != NULL)
fatal("%s line %d: Invalid environment name.",
filename, linenum);
if (options->num_accept_env >= MAX_ACCEPT_ENV)
fatal("%s line %d: too many allow env.",
filename, linenum);
options->accept_env[options->num_accept_env++] =
xstrdup(arg);
}
break;
case sVersionAddendum:
ssh_version_set_addendum(strtok(cp, "\n"));
do {
arg = strdelim(&cp);
} while (arg != NULL && *arg != '\0');
break;
2002-03-18 10:09:43 +00:00
case sDeprecated:
logit("%s line %d: Deprecated option %s",
filename, linenum, arg);
while (arg)
arg = strdelim(&cp);
break;
case sUnsupported:
logit("%s line %d: Unsupported option %s",
2002-03-18 10:09:43 +00:00
filename, linenum, arg);
while (arg)
arg = strdelim(&cp);
break;
default:
fatal("%s line %d: Missing handler for opcode %s (%d)",
filename, linenum, arg, opcode);
}
if ((arg = strdelim(&cp)) != NULL && *arg != '\0')
fatal("%s line %d: garbage at end of line; \"%.200s\".",
filename, linenum, arg);
return 0;
}
2002-03-18 10:09:43 +00:00
/* Reads the server configuration file. */
2002-03-18 10:09:43 +00:00
void
2004-10-28 16:11:31 +00:00
load_server_config(const char *filename, Buffer *conf)
2002-03-18 10:09:43 +00:00
{
2004-10-28 16:11:31 +00:00
char line[1024], *cp;
FILE *f;
2004-10-28 16:11:31 +00:00
debug2("%s: filename %s", __func__, filename);
if ((f = fopen(filename, "r")) == NULL) {
2002-03-18 10:09:43 +00:00
perror(filename);
exit(1);
}
2004-10-28 16:11:31 +00:00
buffer_clear(conf);
2002-03-18 10:09:43 +00:00
while (fgets(line, sizeof(line), f)) {
2004-10-28 16:11:31 +00:00
/*
* Trim out comments and strip whitespace
* NB - preserve newlines, they are needed to reproduce
* line numbers later for error messages
*/
if ((cp = strchr(line, '#')) != NULL)
memcpy(cp, "\n", 2);
cp = line + strspn(line, " \t\r");
buffer_append(conf, cp, strlen(cp));
2000-02-24 14:29:47 +00:00
}
2004-10-28 16:11:31 +00:00
buffer_append(conf, "\0", 1);
2000-02-24 14:29:47 +00:00
fclose(f);
2004-10-28 16:11:31 +00:00
debug2("%s: done config len = %d", __func__, buffer_len(conf));
}
void
parse_server_config(ServerOptions *options, const char *filename, Buffer *conf)
{
int linenum, bad_options = 0;
char *cp, *obuf, *cbuf;
debug2("%s: config %s len %d", __func__, filename, buffer_len(conf));
obuf = cbuf = xstrdup(buffer_ptr(conf));
linenum = 1;
while((cp = strsep(&cbuf, "\n")) != NULL) {
if (process_server_config_line(options, cp, filename,
linenum++) != 0)
bad_options++;
}
xfree(obuf);
2001-05-04 04:14:23 +00:00
if (bad_options > 0)
2002-03-18 10:09:43 +00:00
fatal("%s: terminating, %d bad configuration options",
2001-05-04 04:14:23 +00:00
filename, bad_options);
2000-02-24 14:29:47 +00:00
}