913 lines
26 KiB
C
913 lines
26 KiB
C
/*
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* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
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* All rights reserved
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*
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* As far as I am concerned, the code I have written for this software
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* can be used freely for any purpose. Any derived versions of this
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* software must be clearly marked as such, and if the derived work is
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* incompatible with the protocol description in the RFC file, it must be
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* called by a name other than "ssh" or "Secure Shell".
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*/
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#include "includes.h"
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RCSID("$OpenBSD: servconf.c,v 1.101 2002/02/04 12:15:25 markus Exp $");
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RCSID("$FreeBSD$");
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#if defined(KRB4)
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#include <krb.h>
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#endif
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#if defined(KRB5)
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#include <krb5.h>
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#endif
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#ifdef AFS
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#include <kafs.h>
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#endif
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#include "ssh.h"
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#include "log.h"
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#include "servconf.h"
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#include "xmalloc.h"
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#include "compat.h"
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#include "pathnames.h"
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#include "tildexpand.h"
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#include "misc.h"
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#include "cipher.h"
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#include "kex.h"
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#include "mac.h"
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static void add_listen_addr(ServerOptions *, char *, u_short);
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static void add_one_listen_addr(ServerOptions *, char *, u_short);
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/* AF_UNSPEC or AF_INET or AF_INET6 */
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extern int IPv4or6;
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/* Initializes the server options to their default values. */
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void
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initialize_server_options(ServerOptions *options)
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{
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memset(options, 0, sizeof(*options));
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options->num_ports = 0;
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options->ports_from_cmdline = 0;
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options->listen_addrs = NULL;
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options->num_host_key_files = 0;
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options->pid_file = NULL;
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options->server_key_bits = -1;
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options->login_grace_time = -1;
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options->key_regeneration_time = -1;
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options->permit_root_login = PERMIT_NOT_SET;
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options->ignore_rhosts = -1;
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options->ignore_user_known_hosts = -1;
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options->print_motd = -1;
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options->print_lastlog = -1;
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options->x11_forwarding = -1;
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options->x11_display_offset = -1;
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options->x11_use_localhost = -1;
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options->xauth_location = NULL;
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options->strict_modes = -1;
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options->keepalives = -1;
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options->log_facility = SYSLOG_FACILITY_NOT_SET;
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options->log_level = SYSLOG_LEVEL_NOT_SET;
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options->rhosts_authentication = -1;
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options->rhosts_rsa_authentication = -1;
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options->hostbased_authentication = -1;
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options->hostbased_uses_name_from_packet_only = -1;
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options->rsa_authentication = -1;
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options->pubkey_authentication = -1;
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#if defined(KRB4) || defined(KRB5)
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options->kerberos_authentication = -1;
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options->kerberos_or_local_passwd = -1;
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options->kerberos_ticket_cleanup = -1;
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#endif
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#if defined(AFS) || defined(KRB5)
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options->kerberos_tgt_passing = -1;
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#endif
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#ifdef AFS
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options->afs_token_passing = -1;
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#endif
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options->password_authentication = -1;
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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->use_login = -1;
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options->allow_tcp_forwarding = -1;
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options->num_allow_users = 0;
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options->num_deny_users = 0;
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options->num_allow_groups = 0;
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options->num_deny_groups = 0;
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options->ciphers = NULL;
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options->macs = NULL;
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options->protocol = SSH_PROTO_UNKNOWN;
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options->gateway_ports = -1;
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options->connections_period = 0;
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options->num_subsystems = 0;
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options->max_startups_begin = -1;
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options->max_startups_rate = -1;
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options->max_startups = -1;
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options->banner = NULL;
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options->verify_reverse_mapping = -1;
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options->client_alive_interval = -1;
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options->client_alive_count_max = -1;
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options->authorized_keys_file = NULL;
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options->authorized_keys_file2 = NULL;
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}
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void
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fill_default_server_options(ServerOptions *options)
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{
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if (options->protocol == SSH_PROTO_UNKNOWN)
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options->protocol = SSH_PROTO_1|SSH_PROTO_2;
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if (options->num_host_key_files == 0) {
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/* fill default hostkeys for protocols */
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if (options->protocol & SSH_PROTO_1)
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options->host_key_files[options->num_host_key_files++] =
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_PATH_HOST_KEY_FILE;
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if (options->protocol & SSH_PROTO_2) {
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options->host_key_files[options->num_host_key_files++] =
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_PATH_HOST_RSA_KEY_FILE;
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options->host_key_files[options->num_host_key_files++] =
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_PATH_HOST_DSA_KEY_FILE;
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}
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}
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if (options->num_ports == 0)
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options->ports[options->num_ports++] = SSH_DEFAULT_PORT;
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if (options->listen_addrs == NULL)
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add_listen_addr(options, NULL, 0);
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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)
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options->server_key_bits = 768;
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if (options->login_grace_time == -1)
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options->login_grace_time = 120;
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if (options->key_regeneration_time == -1)
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options->key_regeneration_time = 3600;
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if (options->permit_root_login == PERMIT_NOT_SET)
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options->permit_root_login = PERMIT_NO;
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if (options->ignore_rhosts == -1)
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options->ignore_rhosts = 1;
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if (options->ignore_user_known_hosts == -1)
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options->ignore_user_known_hosts = 0;
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if (options->check_mail == -1)
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options->check_mail = 1;
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if (options->print_motd == -1)
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options->print_motd = 1;
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if (options->print_lastlog == -1)
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options->print_lastlog = 1;
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if (options->x11_forwarding == -1)
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options->x11_forwarding = 1;
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if (options->x11_display_offset == -1)
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options->x11_display_offset = 10;
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if (options->x11_use_localhost == -1)
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options->x11_use_localhost = 1;
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if (options->xauth_location == NULL)
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options->xauth_location = _PATH_XAUTH;
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if (options->strict_modes == -1)
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options->strict_modes = 1;
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if (options->keepalives == -1)
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options->keepalives = 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;
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if (options->rhosts_authentication == -1)
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options->rhosts_authentication = 0;
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if (options->rhosts_rsa_authentication == -1)
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options->rhosts_rsa_authentication = 0;
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if (options->hostbased_authentication == -1)
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options->hostbased_authentication = 0;
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if (options->hostbased_uses_name_from_packet_only == -1)
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options->hostbased_uses_name_from_packet_only = 0;
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if (options->rsa_authentication == -1)
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options->rsa_authentication = 1;
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if (options->pubkey_authentication == -1)
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options->pubkey_authentication = 1;
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#if defined(KRB4) && defined(KRB5)
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if (options->kerberos_authentication == -1)
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options->kerberos_authentication =
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(access(KEYFILE, R_OK) == 0 ||
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(access(krb5_defkeyname, R_OK) == 0));
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#elif defined(KRB4)
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if (options->kerberos_authentication == -1)
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options->kerberos_authentication = (access(KEYFILE, R_OK) == 0);
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#elif defined(KRB5)
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if (options->kerberos_authentication == -1)
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options->kerberos_authentication =
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(access(krb5_defkeyname, R_OK) == 0);
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#endif
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#if defined(KRB4) || defined(KRB5)
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if (options->kerberos_or_local_passwd == -1)
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options->kerberos_or_local_passwd = 1;
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if (options->kerberos_ticket_cleanup == -1)
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options->kerberos_ticket_cleanup = 1;
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#endif
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#if defined(AFS) || defined(KRB5)
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if (options->kerberos_tgt_passing == -1)
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options->kerberos_tgt_passing = 0;
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#endif
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#ifdef AFS
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if (options->afs_token_passing == -1)
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options->afs_token_passing = k_hasafs();
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#endif
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if (options->password_authentication == -1)
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options->password_authentication = 1;
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if (options->kbd_interactive_authentication == -1)
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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)
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options->permit_empty_passwd = 0;
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if (options->use_login == -1)
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options->use_login = 0;
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if (options->allow_tcp_forwarding == -1)
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options->allow_tcp_forwarding = 1;
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if (options->gateway_ports == -1)
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options->gateway_ports = 0;
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if (options->max_startups == -1)
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options->max_startups = 10;
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if (options->max_startups_rate == -1)
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options->max_startups_rate = 100; /* 100% */
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if (options->max_startups_begin == -1)
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options->max_startups_begin = options->max_startups;
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if (options->verify_reverse_mapping == -1)
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options->verify_reverse_mapping = 0;
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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)
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options->client_alive_count_max = 3;
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if (options->authorized_keys_file2 == NULL) {
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/* authorized_keys_file2 falls back to authorized_keys_file */
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if (options->authorized_keys_file != NULL)
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options->authorized_keys_file2 = options->authorized_keys_file;
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else
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options->authorized_keys_file2 = _PATH_SSH_USER_PERMITTED_KEYS2;
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}
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if (options->authorized_keys_file == NULL)
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options->authorized_keys_file = _PATH_SSH_USER_PERMITTED_KEYS;
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}
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/* Keyword tokens. */
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typedef enum {
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sBadOption, /* == unknown option */
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sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime,
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sPermitRootLogin, sLogFacility, sLogLevel,
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sRhostsAuthentication, sRhostsRSAAuthentication, sRSAAuthentication,
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#if defined(KRB4) || defined(KRB5)
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sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup,
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#endif
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#if defined(AFS) || defined(KRB5)
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sKerberosTgtPassing,
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#endif
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#ifdef AFS
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sAFSTokenPassing,
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#endif
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sChallengeResponseAuthentication,
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sPasswordAuthentication, sKbdInteractiveAuthentication, sListenAddress,
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sPrintMotd, sPrintLastLog, sIgnoreRhosts,
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sX11Forwarding, sX11DisplayOffset, sX11UseLocalhost,
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sStrictModes, sEmptyPasswd, sKeepAlives,
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sUseLogin, sAllowTcpForwarding,
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sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups,
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sIgnoreUserKnownHosts, sCiphers, sMacs, sProtocol, sPidFile,
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sGatewayPorts, sPubkeyAuthentication, sXAuthLocation, sSubsystem, sMaxStartups,
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sBanner, sVerifyReverseMapping, sHostbasedAuthentication,
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sHostbasedUsesNameFromPacketOnly, sClientAliveInterval,
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sClientAliveCountMax, sAuthorizedKeysFile, sAuthorizedKeysFile2,
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sCheckMail, sVersionAddendum,
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sDeprecated
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} ServerOpCodes;
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/* Textual representation of the tokens. */
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static struct {
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const char *name;
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ServerOpCodes opcode;
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} keywords[] = {
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{ "port", sPort },
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{ "hostkey", sHostKeyFile },
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{ "hostdsakey", sHostKeyFile }, /* alias */
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{ "pidfile", sPidFile },
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{ "serverkeybits", sServerKeyBits },
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{ "logingracetime", sLoginGraceTime },
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{ "keyregenerationinterval", sKeyRegenerationTime },
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{ "permitrootlogin", sPermitRootLogin },
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{ "syslogfacility", sLogFacility },
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{ "loglevel", sLogLevel },
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{ "rhostsauthentication", sRhostsAuthentication },
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{ "rhostsrsaauthentication", sRhostsRSAAuthentication },
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{ "hostbasedauthentication", sHostbasedAuthentication },
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{ "hostbasedusesnamefrompacketonly", sHostbasedUsesNameFromPacketOnly },
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{ "rsaauthentication", sRSAAuthentication },
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{ "pubkeyauthentication", sPubkeyAuthentication },
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{ "dsaauthentication", sPubkeyAuthentication }, /* alias */
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#if defined(KRB4) || defined(KRB5)
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{ "kerberosauthentication", sKerberosAuthentication },
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{ "kerberosorlocalpasswd", sKerberosOrLocalPasswd },
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{ "kerberosticketcleanup", sKerberosTicketCleanup },
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#endif
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#if defined(AFS) || defined(KRB5)
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{ "kerberostgtpassing", sKerberosTgtPassing },
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#endif
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#ifdef AFS
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{ "afstokenpassing", sAFSTokenPassing },
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#endif
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{ "passwordauthentication", sPasswordAuthentication },
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{ "kbdinteractiveauthentication", sKbdInteractiveAuthentication },
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{ "challengeresponseauthentication", sChallengeResponseAuthentication },
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{ "skeyauthentication", sChallengeResponseAuthentication }, /* alias */
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{ "listenaddress", sListenAddress },
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{ "printmotd", sPrintMotd },
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{ "printlastlog", sPrintLastLog },
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{ "ignorerhosts", sIgnoreRhosts },
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{ "ignoreuserknownhosts", sIgnoreUserKnownHosts },
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{ "x11forwarding", sX11Forwarding },
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{ "x11displayoffset", sX11DisplayOffset },
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{ "x11uselocalhost", sX11UseLocalhost },
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{ "xauthlocation", sXAuthLocation },
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{ "strictmodes", sStrictModes },
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{ "permitemptypasswords", sEmptyPasswd },
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{ "uselogin", sUseLogin },
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{ "keepalive", sKeepAlives },
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{ "allowtcpforwarding", sAllowTcpForwarding },
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{ "allowusers", sAllowUsers },
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{ "denyusers", sDenyUsers },
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{ "allowgroups", sAllowGroups },
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{ "denygroups", sDenyGroups },
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{ "ciphers", sCiphers },
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{ "macs", sMacs },
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{ "protocol", sProtocol },
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{ "gatewayports", sGatewayPorts },
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{ "subsystem", sSubsystem },
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{ "maxstartups", sMaxStartups },
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{ "banner", sBanner },
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{ "verifyreversemapping", sVerifyReverseMapping },
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{ "reversemappingcheck", sVerifyReverseMapping },
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{ "clientaliveinterval", sClientAliveInterval },
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{ "clientalivecountmax", sClientAliveCountMax },
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{ "authorizedkeysfile", sAuthorizedKeysFile },
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{ "authorizedkeysfile2", sAuthorizedKeysFile2 },
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{ "checkmail", sCheckMail },
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{ "versionaddendum", sVersionAddendum },
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{ NULL, sBadOption }
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};
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/*
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* Returns the number of the token pointed to by cp or sBadOption.
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*/
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static ServerOpCodes
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parse_token(const char *cp, const char *filename,
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int linenum)
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{
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u_int i;
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for (i = 0; keywords[i].name; i++)
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if (strcasecmp(cp, keywords[i].name) == 0)
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return keywords[i].opcode;
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error("%s: line %d: Bad configuration option: %s",
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filename, linenum, cp);
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return sBadOption;
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}
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static void
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add_listen_addr(ServerOptions *options, char *addr, u_short port)
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{
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int i;
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if (options->num_ports == 0)
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options->ports[options->num_ports++] = SSH_DEFAULT_PORT;
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if (port == 0)
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for (i = 0; i < options->num_ports; i++)
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add_one_listen_addr(options, addr, options->ports[i]);
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else
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add_one_listen_addr(options, addr, port);
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}
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static void
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add_one_listen_addr(ServerOptions *options, char *addr, u_short port)
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{
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struct addrinfo hints, *ai, *aitop;
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char strport[NI_MAXSERV];
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int gaierr;
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memset(&hints, 0, sizeof(hints));
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hints.ai_family = IPv4or6;
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hints.ai_socktype = SOCK_STREAM;
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hints.ai_flags = (addr == NULL) ? AI_PASSIVE : 0;
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snprintf(strport, sizeof strport, "%d", port);
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if ((gaierr = getaddrinfo(addr, strport, &hints, &aitop)) != 0)
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fatal("bad addr or host: %s (%s)",
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addr ? addr : "<NULL>",
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gai_strerror(gaierr));
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for (ai = aitop; ai->ai_next; ai = ai->ai_next)
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;
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ai->ai_next = options->listen_addrs;
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options->listen_addrs = aitop;
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}
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int
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process_server_config_line(ServerOptions *options, char *line,
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const char *filename, int linenum)
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{
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char *cp, **charptr, *arg, *p;
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int *intptr, value;
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ServerOpCodes opcode;
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int i, n;
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cp = line;
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arg = strdelim(&cp);
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/* Ignore leading whitespace */
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if (*arg == '\0')
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arg = strdelim(&cp);
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if (!arg || !*arg || *arg == '#')
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return 0;
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intptr = NULL;
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charptr = NULL;
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opcode = parse_token(arg, filename, linenum);
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switch (opcode) {
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case sBadOption:
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return -1;
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case sPort:
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/* ignore ports from configfile if cmdline specifies ports */
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if (options->ports_from_cmdline)
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return 0;
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if (options->listen_addrs != NULL)
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fatal("%s line %d: ports must be specified before "
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"ListenAddress.", filename, linenum);
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if (options->num_ports >= MAX_PORTS)
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fatal("%s line %d: too many ports.",
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filename, linenum);
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arg = strdelim(&cp);
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if (!arg || *arg == '\0')
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fatal("%s line %d: missing port number.",
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filename, linenum);
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options->ports[options->num_ports++] = a2port(arg);
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if (options->ports[options->num_ports-1] == 0)
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fatal("%s line %d: Badly formatted port number.",
|
|
filename, linenum);
|
|
break;
|
|
|
|
case sServerKeyBits:
|
|
intptr = &options->server_key_bits;
|
|
parse_int:
|
|
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.",
|
|
filename, linenum);
|
|
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);
|
|
break;
|
|
}
|
|
if (*p == ':') {
|
|
u_short port;
|
|
|
|
p++;
|
|
if (*p == '\0')
|
|
fatal("%s line %d: bad inet addr:port usage.",
|
|
filename, linenum);
|
|
else {
|
|
*(p-1) = '\0';
|
|
if ((port = a2port(p)) == 0)
|
|
fatal("%s line %d: bad port number.",
|
|
filename, linenum);
|
|
add_listen_addr(options, arg, port);
|
|
}
|
|
} 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:
|
|
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;
|
|
|
|
case sPidFile:
|
|
charptr = &options->pid_file;
|
|
goto parse_filename;
|
|
|
|
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;
|
|
parse_flag:
|
|
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 sRhostsAuthentication:
|
|
intptr = &options->rhosts_authentication;
|
|
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;
|
|
#if defined(KRB4) || defined(KRB5)
|
|
case sKerberosAuthentication:
|
|
intptr = &options->kerberos_authentication;
|
|
goto parse_flag;
|
|
|
|
case sKerberosOrLocalPasswd:
|
|
intptr = &options->kerberos_or_local_passwd;
|
|
goto parse_flag;
|
|
|
|
case sKerberosTicketCleanup:
|
|
intptr = &options->kerberos_ticket_cleanup;
|
|
goto parse_flag;
|
|
#endif
|
|
#if defined(AFS) || defined(KRB5)
|
|
case sKerberosTgtPassing:
|
|
intptr = &options->kerberos_tgt_passing;
|
|
goto parse_flag;
|
|
#endif
|
|
#ifdef AFS
|
|
case sAFSTokenPassing:
|
|
intptr = &options->afs_token_passing;
|
|
goto parse_flag;
|
|
#endif
|
|
|
|
case sPasswordAuthentication:
|
|
intptr = &options->password_authentication;
|
|
goto parse_flag;
|
|
|
|
case sKbdInteractiveAuthentication:
|
|
intptr = &options->kbd_interactive_authentication;
|
|
goto parse_flag;
|
|
|
|
case sChallengeResponseAuthentication:
|
|
intptr = &options->challenge_response_authentication;
|
|
goto parse_flag;
|
|
|
|
case sPrintMotd:
|
|
intptr = &options->print_motd;
|
|
goto parse_flag;
|
|
|
|
case sPrintLastLog:
|
|
intptr = &options->print_lastlog;
|
|
goto parse_flag;
|
|
|
|
case sX11Forwarding:
|
|
intptr = &options->x11_forwarding;
|
|
goto parse_flag;
|
|
|
|
case sX11DisplayOffset:
|
|
intptr = &options->x11_display_offset;
|
|
goto parse_int;
|
|
|
|
case sX11UseLocalhost:
|
|
intptr = &options->x11_use_localhost;
|
|
goto parse_flag;
|
|
|
|
case sXAuthLocation:
|
|
charptr = &options->xauth_location;
|
|
goto parse_filename;
|
|
|
|
case sStrictModes:
|
|
intptr = &options->strict_modes;
|
|
goto parse_flag;
|
|
|
|
case sKeepAlives:
|
|
intptr = &options->keepalives;
|
|
goto parse_flag;
|
|
|
|
case sEmptyPasswd:
|
|
intptr = &options->permit_empty_passwd;
|
|
goto parse_flag;
|
|
|
|
case sUseLogin:
|
|
intptr = &options->use_login;
|
|
goto parse_flag;
|
|
|
|
case sGatewayPorts:
|
|
intptr = &options->gateway_ports;
|
|
goto parse_flag;
|
|
|
|
case sVerifyReverseMapping:
|
|
intptr = &options->verify_reverse_mapping;
|
|
goto parse_flag;
|
|
|
|
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 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);
|
|
}
|
|
break;
|
|
|
|
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);
|
|
}
|
|
break;
|
|
|
|
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);
|
|
}
|
|
break;
|
|
|
|
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;
|
|
|
|
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;
|
|
|
|
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;
|
|
|
|
case sDeprecated:
|
|
log("%s line %d: Deprecated option %s",
|
|
filename, linenum, arg);
|
|
while (arg)
|
|
arg = strdelim(&cp);
|
|
break;
|
|
|
|
case sCheckMail:
|
|
intptr = &options->check_mail;
|
|
goto parse_flag;
|
|
|
|
case sVersionAddendum:
|
|
ssh_version_set_addendum(strtok(cp, "\n"));
|
|
do {
|
|
arg = strdelim(&cp);
|
|
} while (arg != NULL && *arg != '\0');
|
|
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;
|
|
}
|
|
|
|
/* Reads the server configuration file. */
|
|
|
|
void
|
|
read_server_config(ServerOptions *options, const char *filename)
|
|
{
|
|
FILE *f;
|
|
char line[1024];
|
|
int linenum;
|
|
int bad_options = 0;
|
|
|
|
f = fopen(filename, "r");
|
|
if (!f) {
|
|
perror(filename);
|
|
exit(1);
|
|
}
|
|
linenum = 0;
|
|
while (fgets(line, sizeof(line), f)) {
|
|
/* Update line number counter. */
|
|
linenum++;
|
|
if (process_server_config_line(options, line, filename, linenum) != 0)
|
|
bad_options++;
|
|
}
|
|
fclose(f);
|
|
if (bad_options > 0)
|
|
fatal("%s: terminating, %d bad configuration options",
|
|
filename, bad_options);
|
|
}
|