mirror of git://anongit.mindrot.org/openssh.git
1427 lines
42 KiB
C
1427 lines
42 KiB
C
/* $OpenBSD: servconf.c,v 1.180 2008/05/08 12:21:16 djm Exp $ */
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/*
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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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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netdb.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <signal.h>
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#include <unistd.h>
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#include <stdarg.h>
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#include "openbsd-compat/sys-queue.h"
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#include "xmalloc.h"
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#include "ssh.h"
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#include "log.h"
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#include "buffer.h"
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#include "servconf.h"
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#include "compat.h"
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#include "pathnames.h"
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#include "misc.h"
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#include "cipher.h"
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#include "key.h"
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#include "kex.h"
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#include "mac.h"
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#include "match.h"
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#include "channels.h"
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#include "groupaccess.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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/* Use of privilege separation or not */
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extern int use_privsep;
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extern Buffer cfg;
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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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/* Portable-specific options */
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options->use_pam = -1;
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/* Standard 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->address_family = -1;
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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->tcp_keep_alive = -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_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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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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options->kerberos_get_afs_token = -1;
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options->gss_authentication=-1;
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options->gss_cleanup_creds = -1;
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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->permit_user_env = -1;
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options->use_login = -1;
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options->compression = -1;
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options->allow_tcp_forwarding = -1;
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options->allow_agent_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->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->max_authtries = -1;
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options->max_sessions = -1;
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options->banner = NULL;
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options->use_dns = -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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options->num_accept_env = 0;
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options->permit_tun = -1;
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options->num_permitted_opens = -1;
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options->adm_forced_command = NULL;
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options->chroot_directory = 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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/* Portable-specific options */
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if (options->use_pam == -1)
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options->use_pam = 0;
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/* Standard Options */
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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_YES;
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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->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 = 0;
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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->tcp_keep_alive == -1)
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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;
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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 (options->kerberos_authentication == -1)
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options->kerberos_authentication = 0;
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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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if (options->kerberos_get_afs_token == -1)
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options->kerberos_get_afs_token = 0;
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if (options->gss_authentication == -1)
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options->gss_authentication = 0;
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if (options->gss_cleanup_creds == -1)
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options->gss_cleanup_creds = 1;
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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->permit_user_env == -1)
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options->permit_user_env = 0;
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if (options->use_login == -1)
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options->use_login = 0;
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if (options->compression == -1)
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options->compression = COMP_DELAYED;
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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->allow_agent_forwarding == -1)
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options->allow_agent_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->max_authtries == -1)
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options->max_authtries = DEFAULT_AUTH_FAIL_MAX;
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if (options->max_sessions == -1)
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options->max_sessions = DEFAULT_SESSIONS_MAX;
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if (options->use_dns == -1)
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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)
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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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if (options->permit_tun == -1)
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options->permit_tun = SSH_TUNMODE_NO;
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/* Turn privilege separation on by default */
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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) {
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error("This platform does not support both privilege "
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"separation and compression");
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error("Compression disabled");
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options->compression = 0;
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}
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#endif
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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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/* Portable-specific options */
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sUsePAM,
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/* Standard Options */
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sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime,
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sPermitRootLogin, sLogFacility, sLogLevel,
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sRhostsRSAAuthentication, sRSAAuthentication,
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sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup,
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sKerberosGetAFSToken,
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sKerberosTgtPassing, sChallengeResponseAuthentication,
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sPasswordAuthentication, sKbdInteractiveAuthentication,
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sListenAddress, sAddressFamily,
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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,
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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,
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sMaxStartups, sMaxAuthTries, sMaxSessions,
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sBanner, sUseDNS, sHostbasedAuthentication,
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sHostbasedUsesNameFromPacketOnly, sClientAliveInterval,
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sClientAliveCountMax, sAuthorizedKeysFile, sAuthorizedKeysFile2,
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sGssAuthentication, sGssCleanupCreds, sAcceptEnv, sPermitTunnel,
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sMatch, sPermitOpen, sForceCommand, sChrootDirectory,
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sUsePrivilegeSeparation, sAllowAgentForwarding,
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sDeprecated, sUnsupported
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} ServerOpCodes;
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#define SSHCFG_GLOBAL 0x01 /* allowed in main section of sshd_config */
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#define SSHCFG_MATCH 0x02 /* allowed inside a Match section */
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#define SSHCFG_ALL (SSHCFG_GLOBAL|SSHCFG_MATCH)
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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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u_int flags;
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} keywords[] = {
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/* Portable-specific options */
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#ifdef USE_PAM
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{ "usepam", sUsePAM, SSHCFG_GLOBAL },
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#else
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{ "usepam", sUnsupported, SSHCFG_GLOBAL },
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#endif
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{ "pamauthenticationviakbdint", sDeprecated, SSHCFG_GLOBAL },
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/* Standard Options */
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{ "port", sPort, SSHCFG_GLOBAL },
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{ "hostkey", sHostKeyFile, SSHCFG_GLOBAL },
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{ "hostdsakey", sHostKeyFile, SSHCFG_GLOBAL }, /* alias */
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{ "pidfile", sPidFile, SSHCFG_GLOBAL },
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{ "serverkeybits", sServerKeyBits, SSHCFG_GLOBAL },
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{ "logingracetime", sLoginGraceTime, SSHCFG_GLOBAL },
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{ "keyregenerationinterval", sKeyRegenerationTime, SSHCFG_GLOBAL },
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{ "permitrootlogin", sPermitRootLogin, SSHCFG_ALL },
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{ "syslogfacility", sLogFacility, SSHCFG_GLOBAL },
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{ "loglevel", sLogLevel, SSHCFG_GLOBAL },
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{ "rhostsauthentication", sDeprecated, SSHCFG_GLOBAL },
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{ "rhostsrsaauthentication", sRhostsRSAAuthentication, SSHCFG_ALL },
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{ "hostbasedauthentication", sHostbasedAuthentication, SSHCFG_ALL },
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{ "hostbasedusesnamefrompacketonly", sHostbasedUsesNameFromPacketOnly, SSHCFG_GLOBAL },
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{ "rsaauthentication", sRSAAuthentication, SSHCFG_ALL },
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{ "pubkeyauthentication", sPubkeyAuthentication, SSHCFG_ALL },
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{ "dsaauthentication", sPubkeyAuthentication, SSHCFG_GLOBAL }, /* alias */
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#ifdef KRB5
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{ "kerberosauthentication", sKerberosAuthentication, SSHCFG_ALL },
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{ "kerberosorlocalpasswd", sKerberosOrLocalPasswd, SSHCFG_GLOBAL },
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{ "kerberosticketcleanup", sKerberosTicketCleanup, SSHCFG_GLOBAL },
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#ifdef USE_AFS
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{ "kerberosgetafstoken", sKerberosGetAFSToken, SSHCFG_GLOBAL },
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#else
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{ "kerberosgetafstoken", sUnsupported, SSHCFG_GLOBAL },
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#endif
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#else
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{ "kerberosauthentication", sUnsupported, SSHCFG_ALL },
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{ "kerberosorlocalpasswd", sUnsupported, SSHCFG_GLOBAL },
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{ "kerberosticketcleanup", sUnsupported, SSHCFG_GLOBAL },
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{ "kerberosgetafstoken", sUnsupported, SSHCFG_GLOBAL },
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#endif
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{ "kerberostgtpassing", sUnsupported, SSHCFG_GLOBAL },
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{ "afstokenpassing", sUnsupported, SSHCFG_GLOBAL },
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#ifdef GSSAPI
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{ "gssapiauthentication", sGssAuthentication, SSHCFG_ALL },
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{ "gssapicleanupcredentials", sGssCleanupCreds, SSHCFG_GLOBAL },
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#else
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{ "gssapiauthentication", sUnsupported, SSHCFG_ALL },
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{ "gssapicleanupcredentials", sUnsupported, SSHCFG_GLOBAL },
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#endif
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{ "passwordauthentication", sPasswordAuthentication, SSHCFG_ALL },
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{ "kbdinteractiveauthentication", sKbdInteractiveAuthentication, SSHCFG_ALL },
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{ "challengeresponseauthentication", sChallengeResponseAuthentication, SSHCFG_GLOBAL },
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{ "skeyauthentication", sChallengeResponseAuthentication, SSHCFG_GLOBAL }, /* alias */
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{ "checkmail", sDeprecated, SSHCFG_GLOBAL },
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{ "listenaddress", sListenAddress, SSHCFG_GLOBAL },
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{ "addressfamily", sAddressFamily, SSHCFG_GLOBAL },
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{ "printmotd", sPrintMotd, SSHCFG_GLOBAL },
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{ "printlastlog", sPrintLastLog, SSHCFG_GLOBAL },
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{ "ignorerhosts", sIgnoreRhosts, SSHCFG_GLOBAL },
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{ "ignoreuserknownhosts", sIgnoreUserKnownHosts, SSHCFG_GLOBAL },
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{ "x11forwarding", sX11Forwarding, SSHCFG_ALL },
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{ "x11displayoffset", sX11DisplayOffset, SSHCFG_ALL },
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{ "x11uselocalhost", sX11UseLocalhost, SSHCFG_ALL },
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{ "xauthlocation", sXAuthLocation, SSHCFG_GLOBAL },
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{ "strictmodes", sStrictModes, SSHCFG_GLOBAL },
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{ "permitemptypasswords", sEmptyPasswd, SSHCFG_GLOBAL },
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{ "permituserenvironment", sPermitUserEnvironment, SSHCFG_GLOBAL },
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{ "uselogin", sUseLogin, SSHCFG_GLOBAL },
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{ "compression", sCompression, SSHCFG_GLOBAL },
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{ "tcpkeepalive", sTCPKeepAlive, SSHCFG_GLOBAL },
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{ "keepalive", sTCPKeepAlive, SSHCFG_GLOBAL }, /* obsolete alias */
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{ "allowtcpforwarding", sAllowTcpForwarding, SSHCFG_ALL },
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{ "allowagentforwarding", sAllowAgentForwarding, SSHCFG_ALL },
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{ "allowusers", sAllowUsers, SSHCFG_GLOBAL },
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{ "denyusers", sDenyUsers, SSHCFG_GLOBAL },
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{ "allowgroups", sAllowGroups, SSHCFG_GLOBAL },
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{ "denygroups", sDenyGroups, SSHCFG_GLOBAL },
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{ "ciphers", sCiphers, SSHCFG_GLOBAL },
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{ "macs", sMacs, SSHCFG_GLOBAL },
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{ "protocol", sProtocol, SSHCFG_GLOBAL },
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{ "gatewayports", sGatewayPorts, SSHCFG_ALL },
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{ "subsystem", sSubsystem, SSHCFG_GLOBAL },
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{ "maxstartups", sMaxStartups, SSHCFG_GLOBAL },
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{ "maxauthtries", sMaxAuthTries, SSHCFG_GLOBAL },
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{ "maxsessions", sMaxSessions, SSHCFG_ALL },
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{ "banner", sBanner, SSHCFG_ALL },
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{ "usedns", sUseDNS, SSHCFG_GLOBAL },
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{ "verifyreversemapping", sDeprecated, SSHCFG_GLOBAL },
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{ "reversemappingcheck", sDeprecated, SSHCFG_GLOBAL },
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{ "clientaliveinterval", sClientAliveInterval, SSHCFG_GLOBAL },
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{ "clientalivecountmax", sClientAliveCountMax, SSHCFG_GLOBAL },
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{ "authorizedkeysfile", sAuthorizedKeysFile, SSHCFG_GLOBAL },
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{ "authorizedkeysfile2", sAuthorizedKeysFile2, SSHCFG_GLOBAL },
|
|
{ "useprivilegeseparation", sUsePrivilegeSeparation, SSHCFG_GLOBAL },
|
|
{ "acceptenv", sAcceptEnv, SSHCFG_GLOBAL },
|
|
{ "permittunnel", sPermitTunnel, SSHCFG_GLOBAL },
|
|
{ "match", sMatch, SSHCFG_ALL },
|
|
{ "permitopen", sPermitOpen, SSHCFG_ALL },
|
|
{ "forcecommand", sForceCommand, SSHCFG_ALL },
|
|
{ "chrootdirectory", sChrootDirectory, SSHCFG_ALL },
|
|
{ NULL, sBadOption, 0 }
|
|
};
|
|
|
|
/*
|
|
* Returns the number of the token pointed to by cp or sBadOption.
|
|
*/
|
|
|
|
static ServerOpCodes
|
|
parse_token(const char *cp, const char *filename,
|
|
int linenum, u_int *flags)
|
|
{
|
|
u_int i;
|
|
|
|
for (i = 0; keywords[i].name; i++)
|
|
if (strcasecmp(cp, keywords[i].name) == 0) {
|
|
*flags = keywords[i].flags;
|
|
return keywords[i].opcode;
|
|
}
|
|
|
|
error("%s: line %d: Bad configuration option: %s",
|
|
filename, linenum, cp);
|
|
return sBadOption;
|
|
}
|
|
|
|
static void
|
|
add_listen_addr(ServerOptions *options, char *addr, u_short port)
|
|
{
|
|
u_int i;
|
|
|
|
if (options->num_ports == 0)
|
|
options->ports[options->num_ports++] = SSH_DEFAULT_PORT;
|
|
if (options->address_family == -1)
|
|
options->address_family = AF_UNSPEC;
|
|
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);
|
|
}
|
|
|
|
static void
|
|
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 = options->address_family;
|
|
hints.ai_socktype = SOCK_STREAM;
|
|
hints.ai_flags = (addr == NULL) ? AI_PASSIVE : 0;
|
|
snprintf(strport, sizeof strport, "%u", port);
|
|
if ((gaierr = getaddrinfo(addr, strport, &hints, &aitop)) != 0)
|
|
fatal("bad addr or host: %s (%s)",
|
|
addr ? addr : "<NULL>",
|
|
ssh_gai_strerror(gaierr));
|
|
for (ai = aitop; ai->ai_next; ai = ai->ai_next)
|
|
;
|
|
ai->ai_next = options->listen_addrs;
|
|
options->listen_addrs = aitop;
|
|
}
|
|
|
|
/*
|
|
* The strategy for the Match blocks is that the config file is parsed twice.
|
|
*
|
|
* The first time is at startup. activep is initialized to 1 and the
|
|
* directives in the global context are processed and acted on. Hitting a
|
|
* Match directive unsets activep and the directives inside the block are
|
|
* checked for syntax only.
|
|
*
|
|
* The second time is after a connection has been established but before
|
|
* authentication. activep is initialized to 2 and global config directives
|
|
* are ignored since they have already been processed. If the criteria in a
|
|
* Match block is met, activep is set and the subsequent directives
|
|
* processed and actioned until EOF or another Match block unsets it. Any
|
|
* options set are copied into the main server config.
|
|
*
|
|
* Potential additions/improvements:
|
|
* - Add Match support for pre-kex directives, eg Protocol, Ciphers.
|
|
*
|
|
* - Add a Tag directive (idea from David Leonard) ala pf, eg:
|
|
* Match Address 192.168.0.*
|
|
* Tag trusted
|
|
* Match Group wheel
|
|
* Tag trusted
|
|
* Match Tag trusted
|
|
* AllowTcpForwarding yes
|
|
* GatewayPorts clientspecified
|
|
* [...]
|
|
*
|
|
* - Add a PermittedChannelRequests directive
|
|
* Match Group shell
|
|
* PermittedChannelRequests session,forwarded-tcpip
|
|
*/
|
|
|
|
static int
|
|
match_cfg_line_group(const char *grps, int line, const char *user)
|
|
{
|
|
int result = 0;
|
|
u_int ngrps = 0;
|
|
char *arg, *p, *cp, *grplist[MAX_MATCH_GROUPS];
|
|
struct passwd *pw;
|
|
|
|
/*
|
|
* Even if we do not have a user yet, we still need to check for
|
|
* valid syntax.
|
|
*/
|
|
arg = cp = xstrdup(grps);
|
|
while ((p = strsep(&cp, ",")) != NULL && *p != '\0') {
|
|
if (ngrps >= MAX_MATCH_GROUPS) {
|
|
error("line %d: too many groups in Match Group", line);
|
|
result = -1;
|
|
goto out;
|
|
}
|
|
grplist[ngrps++] = p;
|
|
}
|
|
|
|
if (user == NULL)
|
|
goto out;
|
|
|
|
if ((pw = getpwnam(user)) == NULL) {
|
|
debug("Can't match group at line %d because user %.100s does "
|
|
"not exist", line, user);
|
|
} else if (ga_init(pw->pw_name, pw->pw_gid) == 0) {
|
|
debug("Can't Match group because user %.100s not in any group "
|
|
"at line %d", user, line);
|
|
} else if (ga_match(grplist, ngrps) != 1) {
|
|
debug("user %.100s does not match group %.100s at line %d",
|
|
user, arg, line);
|
|
} else {
|
|
debug("user %.100s matched group %.100s at line %d", user,
|
|
arg, line);
|
|
result = 1;
|
|
}
|
|
out:
|
|
ga_free();
|
|
xfree(arg);
|
|
return result;
|
|
}
|
|
|
|
static int
|
|
match_cfg_line(char **condition, int line, const char *user, const char *host,
|
|
const char *address)
|
|
{
|
|
int result = 1;
|
|
char *arg, *attrib, *cp = *condition;
|
|
size_t len;
|
|
|
|
if (user == NULL)
|
|
debug3("checking syntax for 'Match %s'", cp);
|
|
else
|
|
debug3("checking match for '%s' user %s host %s addr %s", cp,
|
|
user ? user : "(null)", host ? host : "(null)",
|
|
address ? address : "(null)");
|
|
|
|
while ((attrib = strdelim(&cp)) && *attrib != '\0') {
|
|
if ((arg = strdelim(&cp)) == NULL || *arg == '\0') {
|
|
error("Missing Match criteria for %s", attrib);
|
|
return -1;
|
|
}
|
|
len = strlen(arg);
|
|
if (strcasecmp(attrib, "user") == 0) {
|
|
if (!user) {
|
|
result = 0;
|
|
continue;
|
|
}
|
|
if (match_pattern_list(user, arg, len, 0) != 1)
|
|
result = 0;
|
|
else
|
|
debug("user %.100s matched 'User %.100s' at "
|
|
"line %d", user, arg, line);
|
|
} else if (strcasecmp(attrib, "group") == 0) {
|
|
switch (match_cfg_line_group(arg, line, user)) {
|
|
case -1:
|
|
return -1;
|
|
case 0:
|
|
result = 0;
|
|
}
|
|
} else if (strcasecmp(attrib, "host") == 0) {
|
|
if (!host) {
|
|
result = 0;
|
|
continue;
|
|
}
|
|
if (match_hostname(host, arg, len) != 1)
|
|
result = 0;
|
|
else
|
|
debug("connection from %.100s matched 'Host "
|
|
"%.100s' at line %d", host, arg, line);
|
|
} else if (strcasecmp(attrib, "address") == 0) {
|
|
if (!address) {
|
|
result = 0;
|
|
continue;
|
|
}
|
|
if (match_hostname(address, arg, len) != 1)
|
|
result = 0;
|
|
else
|
|
debug("connection from %.100s matched 'Address "
|
|
"%.100s' at line %d", address, arg, line);
|
|
} else {
|
|
error("Unsupported Match attribute %s", attrib);
|
|
return -1;
|
|
}
|
|
}
|
|
if (user != NULL)
|
|
debug3("match %sfound", result ? "" : "not ");
|
|
*condition = cp;
|
|
return result;
|
|
}
|
|
|
|
#define WHITESPACE " \t\r\n"
|
|
|
|
int
|
|
process_server_config_line(ServerOptions *options, char *line,
|
|
const char *filename, int linenum, int *activep, const char *user,
|
|
const char *host, const char *address)
|
|
{
|
|
char *cp, **charptr, *arg, *p;
|
|
int cmdline = 0, *intptr, value, n;
|
|
SyslogFacility *log_facility_ptr;
|
|
LogLevel *log_level_ptr;
|
|
ServerOpCodes opcode;
|
|
u_short port;
|
|
u_int i, flags = 0;
|
|
size_t len;
|
|
|
|
cp = line;
|
|
if ((arg = strdelim(&cp)) == NULL)
|
|
return 0;
|
|
/* Ignore leading whitespace */
|
|
if (*arg == '\0')
|
|
arg = strdelim(&cp);
|
|
if (!arg || !*arg || *arg == '#')
|
|
return 0;
|
|
intptr = NULL;
|
|
charptr = NULL;
|
|
opcode = parse_token(arg, filename, linenum, &flags);
|
|
|
|
if (activep == NULL) { /* We are processing a command line directive */
|
|
cmdline = 1;
|
|
activep = &cmdline;
|
|
}
|
|
if (*activep && opcode != sMatch)
|
|
debug3("%s:%d setting %s %s", filename, linenum, arg, cp);
|
|
if (*activep == 0 && !(flags & SSHCFG_MATCH)) {
|
|
if (user == NULL) {
|
|
fatal("%s line %d: Directive '%s' is not allowed "
|
|
"within a Match block", filename, linenum, arg);
|
|
} else { /* this is a directive we have already processed */
|
|
while (arg)
|
|
arg = strdelim(&cp);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
switch (opcode) {
|
|
/* Portable-specific options */
|
|
case sUsePAM:
|
|
intptr = &options->use_pam;
|
|
goto parse_flag;
|
|
|
|
/* Standard Options */
|
|
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;
|
|
parse_int:
|
|
arg = strdelim(&cp);
|
|
if (!arg || *arg == '\0')
|
|
fatal("%s line %d: missing integer value.",
|
|
filename, linenum);
|
|
value = atoi(arg);
|
|
if (*activep && *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 == NULL || *arg == '\0')
|
|
fatal("%s line %d: missing address",
|
|
filename, linenum);
|
|
/* check for bare IPv6 address: no "[]" and 2 or more ":" */
|
|
if (strchr(arg, '[') == NULL && (p = strchr(arg, ':')) != NULL
|
|
&& strchr(p+1, ':') != NULL) {
|
|
add_listen_addr(options, arg, 0);
|
|
break;
|
|
}
|
|
p = hpdelim(&arg);
|
|
if (p == NULL)
|
|
fatal("%s line %d: bad address:port usage",
|
|
filename, linenum);
|
|
p = cleanhostname(p);
|
|
if (arg == NULL)
|
|
port = 0;
|
|
else if ((port = a2port(arg)) == 0)
|
|
fatal("%s line %d: bad port number", filename, linenum);
|
|
|
|
add_listen_addr(options, p, port);
|
|
|
|
break;
|
|
|
|
case sAddressFamily:
|
|
arg = strdelim(&cp);
|
|
if (!arg || *arg == '\0')
|
|
fatal("%s line %d: missing address family.",
|
|
filename, linenum);
|
|
intptr = &options->address_family;
|
|
if (options->listen_addrs != NULL)
|
|
fatal("%s line %d: address family must be specified before "
|
|
"ListenAddress.", filename, linenum);
|
|
if (strcasecmp(arg, "inet") == 0)
|
|
value = AF_INET;
|
|
else if (strcasecmp(arg, "inet6") == 0)
|
|
value = AF_INET6;
|
|
else if (strcasecmp(arg, "any") == 0)
|
|
value = AF_UNSPEC;
|
|
else
|
|
fatal("%s line %d: unsupported address family \"%s\".",
|
|
filename, linenum, arg);
|
|
if (*intptr == -1)
|
|
*intptr = value;
|
|
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 (*activep && *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 (*activep && *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 (*activep && *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;
|
|
|
|
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;
|
|
|
|
case sKerberosGetAFSToken:
|
|
intptr = &options->kerberos_get_afs_token;
|
|
goto parse_flag;
|
|
|
|
case sGssAuthentication:
|
|
intptr = &options->gss_authentication;
|
|
goto parse_flag;
|
|
|
|
case sGssCleanupCreds:
|
|
intptr = &options->gss_cleanup_creds;
|
|
goto parse_flag;
|
|
|
|
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 sTCPKeepAlive:
|
|
intptr = &options->tcp_keep_alive;
|
|
goto parse_flag;
|
|
|
|
case sEmptyPasswd:
|
|
intptr = &options->permit_empty_passwd;
|
|
goto parse_flag;
|
|
|
|
case sPermitUserEnvironment:
|
|
intptr = &options->permit_user_env;
|
|
goto parse_flag;
|
|
|
|
case sUseLogin:
|
|
intptr = &options->use_login;
|
|
goto parse_flag;
|
|
|
|
case sCompression:
|
|
intptr = &options->compression;
|
|
arg = strdelim(&cp);
|
|
if (!arg || *arg == '\0')
|
|
fatal("%s line %d: missing yes/no/delayed "
|
|
"argument.", filename, linenum);
|
|
value = 0; /* silence compiler */
|
|
if (strcmp(arg, "delayed") == 0)
|
|
value = COMP_DELAYED;
|
|
else if (strcmp(arg, "yes") == 0)
|
|
value = COMP_ZLIB;
|
|
else if (strcmp(arg, "no") == 0)
|
|
value = COMP_NONE;
|
|
else
|
|
fatal("%s line %d: Bad yes/no/delayed "
|
|
"argument: %s", filename, linenum, arg);
|
|
if (*intptr == -1)
|
|
*intptr = value;
|
|
break;
|
|
|
|
case sGatewayPorts:
|
|
intptr = &options->gateway_ports;
|
|
arg = strdelim(&cp);
|
|
if (!arg || *arg == '\0')
|
|
fatal("%s line %d: missing yes/no/clientspecified "
|
|
"argument.", filename, linenum);
|
|
value = 0; /* silence compiler */
|
|
if (strcmp(arg, "clientspecified") == 0)
|
|
value = 2;
|
|
else if (strcmp(arg, "yes") == 0)
|
|
value = 1;
|
|
else if (strcmp(arg, "no") == 0)
|
|
value = 0;
|
|
else
|
|
fatal("%s line %d: Bad yes/no/clientspecified "
|
|
"argument: %s", filename, linenum, arg);
|
|
if (*activep && *intptr == -1)
|
|
*intptr = value;
|
|
break;
|
|
|
|
case sUseDNS:
|
|
intptr = &options->use_dns;
|
|
goto parse_flag;
|
|
|
|
case sLogFacility:
|
|
log_facility_ptr = &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 (*log_facility_ptr == -1)
|
|
*log_facility_ptr = (SyslogFacility) value;
|
|
break;
|
|
|
|
case sLogLevel:
|
|
log_level_ptr = &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 (*log_level_ptr == -1)
|
|
*log_level_ptr = (LogLevel) value;
|
|
break;
|
|
|
|
case sAllowTcpForwarding:
|
|
intptr = &options->allow_tcp_forwarding;
|
|
goto parse_flag;
|
|
|
|
case sAllowAgentForwarding:
|
|
intptr = &options->allow_agent_forwarding;
|
|
goto parse_flag;
|
|
|
|
case sUsePrivilegeSeparation:
|
|
intptr = &use_privsep;
|
|
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);
|
|
if (!*activep) {
|
|
arg = strdelim(&cp);
|
|
break;
|
|
}
|
|
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);
|
|
|
|
/* Collect arguments (separate to executable) */
|
|
p = xstrdup(arg);
|
|
len = strlen(p) + 1;
|
|
while ((arg = strdelim(&cp)) != NULL && *arg != '\0') {
|
|
len += 1 + strlen(arg);
|
|
p = xrealloc(p, 1, len);
|
|
strlcat(p, " ", len);
|
|
strlcat(p, arg, len);
|
|
}
|
|
options->subsystem_args[options->num_subsystems] = p;
|
|
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 sMaxAuthTries:
|
|
intptr = &options->max_authtries;
|
|
goto parse_int;
|
|
|
|
case sMaxSessions:
|
|
intptr = &options->max_sessions;
|
|
goto parse_int;
|
|
|
|
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 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);
|
|
if (!*activep)
|
|
break;
|
|
options->accept_env[options->num_accept_env++] =
|
|
xstrdup(arg);
|
|
}
|
|
break;
|
|
|
|
case sPermitTunnel:
|
|
intptr = &options->permit_tun;
|
|
arg = strdelim(&cp);
|
|
if (!arg || *arg == '\0')
|
|
fatal("%s line %d: Missing yes/point-to-point/"
|
|
"ethernet/no argument.", filename, linenum);
|
|
value = 0; /* silence compiler */
|
|
if (strcasecmp(arg, "ethernet") == 0)
|
|
value = SSH_TUNMODE_ETHERNET;
|
|
else if (strcasecmp(arg, "point-to-point") == 0)
|
|
value = SSH_TUNMODE_POINTOPOINT;
|
|
else if (strcasecmp(arg, "yes") == 0)
|
|
value = SSH_TUNMODE_YES;
|
|
else if (strcasecmp(arg, "no") == 0)
|
|
value = SSH_TUNMODE_NO;
|
|
else
|
|
fatal("%s line %d: Bad yes/point-to-point/ethernet/"
|
|
"no argument: %s", filename, linenum, arg);
|
|
if (*intptr == -1)
|
|
*intptr = value;
|
|
break;
|
|
|
|
case sMatch:
|
|
if (cmdline)
|
|
fatal("Match directive not supported as a command-line "
|
|
"option");
|
|
value = match_cfg_line(&cp, linenum, user, host, address);
|
|
if (value < 0)
|
|
fatal("%s line %d: Bad Match condition", filename,
|
|
linenum);
|
|
*activep = value;
|
|
break;
|
|
|
|
case sPermitOpen:
|
|
arg = strdelim(&cp);
|
|
if (!arg || *arg == '\0')
|
|
fatal("%s line %d: missing PermitOpen specification",
|
|
filename, linenum);
|
|
n = options->num_permitted_opens; /* modified later */
|
|
if (strcmp(arg, "any") == 0) {
|
|
if (*activep && n == -1) {
|
|
channel_clear_adm_permitted_opens();
|
|
options->num_permitted_opens = 0;
|
|
}
|
|
break;
|
|
}
|
|
if (*activep && n == -1)
|
|
channel_clear_adm_permitted_opens();
|
|
for (; arg != NULL && *arg != '\0'; arg = strdelim(&cp)) {
|
|
p = hpdelim(&arg);
|
|
if (p == NULL)
|
|
fatal("%s line %d: missing host in PermitOpen",
|
|
filename, linenum);
|
|
p = cleanhostname(p);
|
|
if (arg == NULL || (port = a2port(arg)) == 0)
|
|
fatal("%s line %d: bad port number in "
|
|
"PermitOpen", filename, linenum);
|
|
if (*activep && n == -1)
|
|
options->num_permitted_opens =
|
|
channel_add_adm_permitted_opens(p, port);
|
|
}
|
|
break;
|
|
|
|
case sForceCommand:
|
|
if (cp == NULL)
|
|
fatal("%.200s line %d: Missing argument.", filename,
|
|
linenum);
|
|
len = strspn(cp, WHITESPACE);
|
|
if (*activep && options->adm_forced_command == NULL)
|
|
options->adm_forced_command = xstrdup(cp + len);
|
|
return 0;
|
|
|
|
case sChrootDirectory:
|
|
charptr = &options->chroot_directory;
|
|
|
|
arg = strdelim(&cp);
|
|
if (!arg || *arg == '\0')
|
|
fatal("%s line %d: missing file name.",
|
|
filename, linenum);
|
|
if (*activep && *charptr == NULL)
|
|
*charptr = xstrdup(arg);
|
|
break;
|
|
|
|
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",
|
|
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;
|
|
}
|
|
|
|
/* Reads the server configuration file. */
|
|
|
|
void
|
|
load_server_config(const char *filename, Buffer *conf)
|
|
{
|
|
char line[1024], *cp;
|
|
FILE *f;
|
|
|
|
debug2("%s: filename %s", __func__, filename);
|
|
if ((f = fopen(filename, "r")) == NULL) {
|
|
perror(filename);
|
|
exit(1);
|
|
}
|
|
buffer_clear(conf);
|
|
while (fgets(line, sizeof(line), f)) {
|
|
/*
|
|
* 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));
|
|
}
|
|
buffer_append(conf, "\0", 1);
|
|
fclose(f);
|
|
debug2("%s: done config len = %d", __func__, buffer_len(conf));
|
|
}
|
|
|
|
void
|
|
parse_server_match_config(ServerOptions *options, const char *user,
|
|
const char *host, const char *address)
|
|
{
|
|
ServerOptions mo;
|
|
|
|
initialize_server_options(&mo);
|
|
parse_server_config(&mo, "reprocess config", &cfg, user, host, address);
|
|
copy_set_server_options(options, &mo, 0);
|
|
}
|
|
|
|
/* Helper macros */
|
|
#define M_CP_INTOPT(n) do {\
|
|
if (src->n != -1) \
|
|
dst->n = src->n; \
|
|
} while (0)
|
|
#define M_CP_STROPT(n) do {\
|
|
if (src->n != NULL) { \
|
|
if (dst->n != NULL) \
|
|
xfree(dst->n); \
|
|
dst->n = src->n; \
|
|
} \
|
|
} while(0)
|
|
|
|
/*
|
|
* Copy any supported values that are set.
|
|
*
|
|
* If the preauth flag is set, we do not bother copying the the string or
|
|
* array values that are not used pre-authentication, because any that we
|
|
* do use must be explictly sent in mm_getpwnamallow().
|
|
*/
|
|
void
|
|
copy_set_server_options(ServerOptions *dst, ServerOptions *src, int preauth)
|
|
{
|
|
M_CP_INTOPT(password_authentication);
|
|
M_CP_INTOPT(gss_authentication);
|
|
M_CP_INTOPT(rsa_authentication);
|
|
M_CP_INTOPT(pubkey_authentication);
|
|
M_CP_INTOPT(kerberos_authentication);
|
|
M_CP_INTOPT(hostbased_authentication);
|
|
M_CP_INTOPT(kbd_interactive_authentication);
|
|
M_CP_INTOPT(permit_root_login);
|
|
|
|
M_CP_INTOPT(allow_tcp_forwarding);
|
|
M_CP_INTOPT(allow_agent_forwarding);
|
|
M_CP_INTOPT(gateway_ports);
|
|
M_CP_INTOPT(x11_display_offset);
|
|
M_CP_INTOPT(x11_forwarding);
|
|
M_CP_INTOPT(x11_use_localhost);
|
|
M_CP_INTOPT(max_sessions);
|
|
|
|
M_CP_STROPT(banner);
|
|
if (preauth)
|
|
return;
|
|
M_CP_STROPT(adm_forced_command);
|
|
M_CP_STROPT(chroot_directory);
|
|
}
|
|
|
|
#undef M_CP_INTOPT
|
|
#undef M_CP_STROPT
|
|
|
|
void
|
|
parse_server_config(ServerOptions *options, const char *filename, Buffer *conf,
|
|
const char *user, const char *host, const char *address)
|
|
{
|
|
int active, 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));
|
|
active = user ? 0 : 1;
|
|
linenum = 1;
|
|
while ((cp = strsep(&cbuf, "\n")) != NULL) {
|
|
if (process_server_config_line(options, cp, filename,
|
|
linenum++, &active, user, host, address) != 0)
|
|
bad_options++;
|
|
}
|
|
xfree(obuf);
|
|
if (bad_options > 0)
|
|
fatal("%s: terminating, %d bad configuration options",
|
|
filename, bad_options);
|
|
}
|