mirror of
git://anongit.mindrot.org/openssh.git
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2ae4f337b2
Replace <sys/param.h> with <limits.h> and other less dirty headers where possible. Annotate <sys/param.h> lines with their current reasons. Switch to PATH_MAX, NGROUPS_MAX, HOST_NAME_MAX+1, LOGIN_NAME_MAX, etc. Change MIN() and MAX() to local definitions of MINIMUM() and MAXIMUM() where sensible to avoid pulling in the pollution. These are the files confirmed through binary verification. ok guenther, millert, doug (helped with the verification protocol)
2219 lines
66 KiB
C
2219 lines
66 KiB
C
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/* $OpenBSD: servconf.c,v 1.259 2015/01/16 06:40:12 deraadt 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 <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <ctype.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 <limits.h>
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#include <stdarg.h>
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#include <errno.h>
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#ifdef HAVE_UTIL_H
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#include <util.h>
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#endif
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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 "misc.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 "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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#include "canohost.h"
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#include "packet.h"
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#include "hostfile.h"
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#include "auth.h"
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#include "myproposal.h"
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#include "digest.h"
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static void add_listen_addr(ServerOptions *, char *, int);
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static void add_one_listen_addr(ServerOptions *, char *, int);
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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->num_host_cert_files = 0;
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options->host_key_agent = NULL;
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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->permit_tty = -1;
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options->permit_user_rc = -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->hostbased_key_types = NULL;
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options->rsa_authentication = -1;
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options->pubkey_authentication = -1;
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options->pubkey_key_types = NULL;
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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->rekey_limit = -1;
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options->rekey_interval = -1;
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options->allow_tcp_forwarding = -1;
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options->allow_streamlocal_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->kex_algorithms = NULL;
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options->protocol = SSH_PROTO_UNKNOWN;
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options->fwd_opts.gateway_ports = -1;
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options->fwd_opts.streamlocal_bind_mask = (mode_t)-1;
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options->fwd_opts.streamlocal_bind_unlink = -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->num_authkeys_files = 0;
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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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options->authorized_keys_command = NULL;
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options->authorized_keys_command_user = NULL;
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options->revoked_keys_file = NULL;
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options->trusted_user_ca_keys = NULL;
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options->authorized_principals_file = NULL;
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options->ip_qos_interactive = -1;
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options->ip_qos_bulk = -1;
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options->version_addendum = NULL;
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options->fingerprint_hash = -1;
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}
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/* Returns 1 if a string option is unset or set to "none" or 0 otherwise. */
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static int
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option_clear_or_none(const char *o)
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{
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return o == NULL || strcasecmp(o, "none") == 0;
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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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int i;
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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_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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#ifdef OPENSSL_HAS_ECC
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options->host_key_files[options->num_host_key_files++] =
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_PATH_HOST_ECDSA_KEY_FILE;
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#endif
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options->host_key_files[options->num_host_key_files++] =
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_PATH_HOST_ED25519_KEY_FILE;
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}
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}
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/* No certificates by default */
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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 = xstrdup(_PATH_SSH_DAEMON_PID_FILE);
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if (options->server_key_bits == -1)
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options->server_key_bits = 1024;
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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 = xstrdup(_PATH_XAUTH);
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if (options->permit_tty == -1)
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options->permit_tty = 1;
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if (options->permit_user_rc == -1)
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options->permit_user_rc = 1;
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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->hostbased_key_types == NULL)
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options->hostbased_key_types = xstrdup("*");
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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->pubkey_key_types == NULL)
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options->pubkey_key_types = xstrdup("*");
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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->rekey_limit == -1)
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options->rekey_limit = 0;
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if (options->rekey_interval == -1)
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options->rekey_interval = 0;
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if (options->allow_tcp_forwarding == -1)
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options->allow_tcp_forwarding = FORWARD_ALLOW;
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if (options->allow_streamlocal_forwarding == -1)
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options->allow_streamlocal_forwarding = FORWARD_ALLOW;
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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->fwd_opts.gateway_ports == -1)
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options->fwd_opts.gateway_ports = 0;
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if (options->max_startups == -1)
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options->max_startups = 100;
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if (options->max_startups_rate == -1)
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options->max_startups_rate = 30; /* 30% */
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if (options->max_startups_begin == -1)
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options->max_startups_begin = 10;
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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->num_authkeys_files == 0) {
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options->authorized_keys_files[options->num_authkeys_files++] =
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xstrdup(_PATH_SSH_USER_PERMITTED_KEYS);
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options->authorized_keys_files[options->num_authkeys_files++] =
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xstrdup(_PATH_SSH_USER_PERMITTED_KEYS2);
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}
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if (options->permit_tun == -1)
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options->permit_tun = SSH_TUNMODE_NO;
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if (options->ip_qos_interactive == -1)
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options->ip_qos_interactive = IPTOS_LOWDELAY;
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if (options->ip_qos_bulk == -1)
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options->ip_qos_bulk = IPTOS_THROUGHPUT;
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if (options->version_addendum == NULL)
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options->version_addendum = xstrdup("");
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if (options->fwd_opts.streamlocal_bind_mask == (mode_t)-1)
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options->fwd_opts.streamlocal_bind_mask = 0177;
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if (options->fwd_opts.streamlocal_bind_unlink == -1)
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options->fwd_opts.streamlocal_bind_unlink = 0;
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if (options->fingerprint_hash == -1)
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options->fingerprint_hash = SSH_FP_HASH_DEFAULT;
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/* Turn privilege separation on by default */
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if (use_privsep == -1)
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use_privsep = PRIVSEP_NOSANDBOX;
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#define CLEAR_ON_NONE(v) \
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do { \
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if (option_clear_or_none(v)) { \
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free(v); \
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v = NULL; \
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} \
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} while(0)
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CLEAR_ON_NONE(options->pid_file);
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CLEAR_ON_NONE(options->xauth_location);
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CLEAR_ON_NONE(options->banner);
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CLEAR_ON_NONE(options->trusted_user_ca_keys);
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CLEAR_ON_NONE(options->revoked_keys_file);
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for (i = 0; i < options->num_host_key_files; i++)
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CLEAR_ON_NONE(options->host_key_files[i]);
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for (i = 0; i < options->num_host_cert_files; i++)
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CLEAR_ON_NONE(options->host_cert_files[i]);
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#undef CLEAR_ON_NONE
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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,
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sKeyRegenerationTime, 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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sPermitTTY, sStrictModes, sEmptyPasswd, sTCPKeepAlive,
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sPermitUserEnvironment, sUseLogin, sAllowTcpForwarding, sCompression,
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sRekeyLimit, sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups,
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sIgnoreUserKnownHosts, sCiphers, sMacs, sProtocol, sPidFile,
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sGatewayPorts, sPubkeyAuthentication, sPubkeyAcceptedKeyTypes,
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sXAuthLocation, sSubsystem, sMaxStartups, sMaxAuthTries, sMaxSessions,
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sBanner, sUseDNS, sHostbasedAuthentication,
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sHostbasedUsesNameFromPacketOnly, sHostbasedAcceptedKeyTypes,
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sClientAliveInterval, sClientAliveCountMax, sAuthorizedKeysFile,
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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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sHostCertificate,
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sRevokedKeys, sTrustedUserCAKeys, sAuthorizedPrincipalsFile,
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sKexAlgorithms, sIPQoS, sVersionAddendum,
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sAuthorizedKeysCommand, sAuthorizedKeysCommandUser,
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sAuthenticationMethods, sHostKeyAgent, sPermitUserRC,
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sStreamLocalBindMask, sStreamLocalBindUnlink,
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sAllowStreamLocalForwarding, sFingerprintHash,
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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
|
|
{ "pamauthenticationviakbdint", sDeprecated, SSHCFG_GLOBAL },
|
|
/* Standard Options */
|
|
{ "port", sPort, SSHCFG_GLOBAL },
|
|
{ "hostkey", sHostKeyFile, SSHCFG_GLOBAL },
|
|
{ "hostdsakey", sHostKeyFile, SSHCFG_GLOBAL }, /* alias */
|
|
{ "hostkeyagent", sHostKeyAgent, SSHCFG_GLOBAL },
|
|
{ "pidfile", sPidFile, SSHCFG_GLOBAL },
|
|
{ "serverkeybits", sServerKeyBits, SSHCFG_GLOBAL },
|
|
{ "logingracetime", sLoginGraceTime, SSHCFG_GLOBAL },
|
|
{ "keyregenerationinterval", sKeyRegenerationTime, SSHCFG_GLOBAL },
|
|
{ "permitrootlogin", sPermitRootLogin, SSHCFG_ALL },
|
|
{ "syslogfacility", sLogFacility, SSHCFG_GLOBAL },
|
|
{ "loglevel", sLogLevel, SSHCFG_GLOBAL },
|
|
{ "rhostsauthentication", sDeprecated, SSHCFG_GLOBAL },
|
|
{ "rhostsrsaauthentication", sRhostsRSAAuthentication, SSHCFG_ALL },
|
|
{ "hostbasedauthentication", sHostbasedAuthentication, SSHCFG_ALL },
|
|
{ "hostbasedusesnamefrompacketonly", sHostbasedUsesNameFromPacketOnly, SSHCFG_ALL },
|
|
{ "hostbasedacceptedkeytypes", sHostbasedAcceptedKeyTypes, SSHCFG_ALL },
|
|
{ "rsaauthentication", sRSAAuthentication, SSHCFG_ALL },
|
|
{ "pubkeyauthentication", sPubkeyAuthentication, SSHCFG_ALL },
|
|
{ "pubkeyacceptedkeytypes", sPubkeyAcceptedKeyTypes, SSHCFG_ALL },
|
|
{ "dsaauthentication", sPubkeyAuthentication, SSHCFG_GLOBAL }, /* alias */
|
|
#ifdef KRB5
|
|
{ "kerberosauthentication", sKerberosAuthentication, SSHCFG_ALL },
|
|
{ "kerberosorlocalpasswd", sKerberosOrLocalPasswd, SSHCFG_GLOBAL },
|
|
{ "kerberosticketcleanup", sKerberosTicketCleanup, SSHCFG_GLOBAL },
|
|
#ifdef USE_AFS
|
|
{ "kerberosgetafstoken", sKerberosGetAFSToken, SSHCFG_GLOBAL },
|
|
#else
|
|
{ "kerberosgetafstoken", sUnsupported, SSHCFG_GLOBAL },
|
|
#endif
|
|
#else
|
|
{ "kerberosauthentication", sUnsupported, SSHCFG_ALL },
|
|
{ "kerberosorlocalpasswd", sUnsupported, SSHCFG_GLOBAL },
|
|
{ "kerberosticketcleanup", sUnsupported, SSHCFG_GLOBAL },
|
|
{ "kerberosgetafstoken", sUnsupported, SSHCFG_GLOBAL },
|
|
#endif
|
|
{ "kerberostgtpassing", sUnsupported, SSHCFG_GLOBAL },
|
|
{ "afstokenpassing", sUnsupported, SSHCFG_GLOBAL },
|
|
#ifdef GSSAPI
|
|
{ "gssapiauthentication", sGssAuthentication, SSHCFG_ALL },
|
|
{ "gssapicleanupcredentials", sGssCleanupCreds, SSHCFG_GLOBAL },
|
|
#else
|
|
{ "gssapiauthentication", sUnsupported, SSHCFG_ALL },
|
|
{ "gssapicleanupcredentials", sUnsupported, SSHCFG_GLOBAL },
|
|
#endif
|
|
{ "passwordauthentication", sPasswordAuthentication, SSHCFG_ALL },
|
|
{ "kbdinteractiveauthentication", sKbdInteractiveAuthentication, SSHCFG_ALL },
|
|
{ "challengeresponseauthentication", sChallengeResponseAuthentication, SSHCFG_GLOBAL },
|
|
{ "skeyauthentication", sChallengeResponseAuthentication, SSHCFG_GLOBAL }, /* alias */
|
|
{ "checkmail", sDeprecated, SSHCFG_GLOBAL },
|
|
{ "listenaddress", sListenAddress, SSHCFG_GLOBAL },
|
|
{ "addressfamily", sAddressFamily, SSHCFG_GLOBAL },
|
|
{ "printmotd", sPrintMotd, SSHCFG_GLOBAL },
|
|
{ "printlastlog", sPrintLastLog, SSHCFG_GLOBAL },
|
|
{ "ignorerhosts", sIgnoreRhosts, SSHCFG_GLOBAL },
|
|
{ "ignoreuserknownhosts", sIgnoreUserKnownHosts, SSHCFG_GLOBAL },
|
|
{ "x11forwarding", sX11Forwarding, SSHCFG_ALL },
|
|
{ "x11displayoffset", sX11DisplayOffset, SSHCFG_ALL },
|
|
{ "x11uselocalhost", sX11UseLocalhost, SSHCFG_ALL },
|
|
{ "xauthlocation", sXAuthLocation, SSHCFG_GLOBAL },
|
|
{ "strictmodes", sStrictModes, SSHCFG_GLOBAL },
|
|
{ "permitemptypasswords", sEmptyPasswd, SSHCFG_ALL },
|
|
{ "permituserenvironment", sPermitUserEnvironment, SSHCFG_GLOBAL },
|
|
{ "uselogin", sUseLogin, SSHCFG_GLOBAL },
|
|
{ "compression", sCompression, SSHCFG_GLOBAL },
|
|
{ "rekeylimit", sRekeyLimit, SSHCFG_ALL },
|
|
{ "tcpkeepalive", sTCPKeepAlive, SSHCFG_GLOBAL },
|
|
{ "keepalive", sTCPKeepAlive, SSHCFG_GLOBAL }, /* obsolete alias */
|
|
{ "allowtcpforwarding", sAllowTcpForwarding, SSHCFG_ALL },
|
|
{ "allowagentforwarding", sAllowAgentForwarding, SSHCFG_ALL },
|
|
{ "allowusers", sAllowUsers, SSHCFG_ALL },
|
|
{ "denyusers", sDenyUsers, SSHCFG_ALL },
|
|
{ "allowgroups", sAllowGroups, SSHCFG_ALL },
|
|
{ "denygroups", sDenyGroups, SSHCFG_ALL },
|
|
{ "ciphers", sCiphers, SSHCFG_GLOBAL },
|
|
{ "macs", sMacs, SSHCFG_GLOBAL },
|
|
{ "protocol", sProtocol, SSHCFG_GLOBAL },
|
|
{ "gatewayports", sGatewayPorts, SSHCFG_ALL },
|
|
{ "subsystem", sSubsystem, SSHCFG_GLOBAL },
|
|
{ "maxstartups", sMaxStartups, SSHCFG_GLOBAL },
|
|
{ "maxauthtries", sMaxAuthTries, SSHCFG_ALL },
|
|
{ "maxsessions", sMaxSessions, SSHCFG_ALL },
|
|
{ "banner", sBanner, SSHCFG_ALL },
|
|
{ "usedns", sUseDNS, SSHCFG_GLOBAL },
|
|
{ "verifyreversemapping", sDeprecated, SSHCFG_GLOBAL },
|
|
{ "reversemappingcheck", sDeprecated, SSHCFG_GLOBAL },
|
|
{ "clientaliveinterval", sClientAliveInterval, SSHCFG_GLOBAL },
|
|
{ "clientalivecountmax", sClientAliveCountMax, SSHCFG_GLOBAL },
|
|
{ "authorizedkeysfile", sAuthorizedKeysFile, SSHCFG_ALL },
|
|
{ "authorizedkeysfile2", sDeprecated, SSHCFG_ALL },
|
|
{ "useprivilegeseparation", sUsePrivilegeSeparation, SSHCFG_GLOBAL},
|
|
{ "acceptenv", sAcceptEnv, SSHCFG_ALL },
|
|
{ "permittunnel", sPermitTunnel, SSHCFG_ALL },
|
|
{ "permittty", sPermitTTY, SSHCFG_ALL },
|
|
{ "permituserrc", sPermitUserRC, SSHCFG_ALL },
|
|
{ "match", sMatch, SSHCFG_ALL },
|
|
{ "permitopen", sPermitOpen, SSHCFG_ALL },
|
|
{ "forcecommand", sForceCommand, SSHCFG_ALL },
|
|
{ "chrootdirectory", sChrootDirectory, SSHCFG_ALL },
|
|
{ "hostcertificate", sHostCertificate, SSHCFG_GLOBAL },
|
|
{ "revokedkeys", sRevokedKeys, SSHCFG_ALL },
|
|
{ "trustedusercakeys", sTrustedUserCAKeys, SSHCFG_ALL },
|
|
{ "authorizedprincipalsfile", sAuthorizedPrincipalsFile, SSHCFG_ALL },
|
|
{ "kexalgorithms", sKexAlgorithms, SSHCFG_GLOBAL },
|
|
{ "ipqos", sIPQoS, SSHCFG_ALL },
|
|
{ "authorizedkeyscommand", sAuthorizedKeysCommand, SSHCFG_ALL },
|
|
{ "authorizedkeyscommanduser", sAuthorizedKeysCommandUser, SSHCFG_ALL },
|
|
{ "versionaddendum", sVersionAddendum, SSHCFG_GLOBAL },
|
|
{ "authenticationmethods", sAuthenticationMethods, SSHCFG_ALL },
|
|
{ "streamlocalbindmask", sStreamLocalBindMask, SSHCFG_ALL },
|
|
{ "streamlocalbindunlink", sStreamLocalBindUnlink, SSHCFG_ALL },
|
|
{ "allowstreamlocalforwarding", sAllowStreamLocalForwarding, SSHCFG_ALL },
|
|
{ "fingerprinthash", sFingerprintHash, SSHCFG_GLOBAL },
|
|
{ NULL, sBadOption, 0 }
|
|
};
|
|
|
|
static struct {
|
|
int val;
|
|
char *text;
|
|
} tunmode_desc[] = {
|
|
{ SSH_TUNMODE_NO, "no" },
|
|
{ SSH_TUNMODE_POINTOPOINT, "point-to-point" },
|
|
{ SSH_TUNMODE_ETHERNET, "ethernet" },
|
|
{ SSH_TUNMODE_YES, "yes" },
|
|
{ -1, NULL }
|
|
};
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
char *
|
|
derelativise_path(const char *path)
|
|
{
|
|
char *expanded, *ret, cwd[PATH_MAX];
|
|
|
|
if (strcasecmp(path, "none") == 0)
|
|
return xstrdup("none");
|
|
expanded = tilde_expand_filename(path, getuid());
|
|
if (*expanded == '/')
|
|
return expanded;
|
|
if (getcwd(cwd, sizeof(cwd)) == NULL)
|
|
fatal("%s: getcwd: %s", __func__, strerror(errno));
|
|
xasprintf(&ret, "%s/%s", cwd, expanded);
|
|
free(expanded);
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
add_listen_addr(ServerOptions *options, char *addr, int 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, int 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, "%d", 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;
|
|
}
|
|
|
|
struct connection_info *
|
|
get_connection_info(int populate, int use_dns)
|
|
{
|
|
static struct connection_info ci;
|
|
|
|
if (!populate)
|
|
return &ci;
|
|
ci.host = get_canonical_hostname(use_dns);
|
|
ci.address = get_remote_ipaddr();
|
|
ci.laddress = get_local_ipaddr(packet_get_connection_in());
|
|
ci.lport = get_local_port();
|
|
return &ci;
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
struct passwd *pw;
|
|
|
|
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_pattern_list(grps) != 1) {
|
|
debug("user %.100s does not match group list %.100s at line %d",
|
|
user, grps, line);
|
|
} else {
|
|
debug("user %.100s matched group list %.100s at line %d", user,
|
|
grps, line);
|
|
result = 1;
|
|
}
|
|
out:
|
|
ga_free();
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* All of the attributes on a single Match line are ANDed together, so we need
|
|
* to check every attribute and set the result to zero if any attribute does
|
|
* not match.
|
|
*/
|
|
static int
|
|
match_cfg_line(char **condition, int line, struct connection_info *ci)
|
|
{
|
|
int result = 1, attributes = 0, port;
|
|
char *arg, *attrib, *cp = *condition;
|
|
size_t len;
|
|
|
|
if (ci == NULL)
|
|
debug3("checking syntax for 'Match %s'", cp);
|
|
else
|
|
debug3("checking match for '%s' user %s host %s addr %s "
|
|
"laddr %s lport %d", cp, ci->user ? ci->user : "(null)",
|
|
ci->host ? ci->host : "(null)",
|
|
ci->address ? ci->address : "(null)",
|
|
ci->laddress ? ci->laddress : "(null)", ci->lport);
|
|
|
|
while ((attrib = strdelim(&cp)) && *attrib != '\0') {
|
|
attributes++;
|
|
if (strcasecmp(attrib, "all") == 0) {
|
|
if (attributes != 1 ||
|
|
((arg = strdelim(&cp)) != NULL && *arg != '\0')) {
|
|
error("'all' cannot be combined with other "
|
|
"Match attributes");
|
|
return -1;
|
|
}
|
|
*condition = cp;
|
|
return 1;
|
|
}
|
|
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 (ci == NULL || ci->user == NULL) {
|
|
result = 0;
|
|
continue;
|
|
}
|
|
if (match_pattern_list(ci->user, arg, len, 0) != 1)
|
|
result = 0;
|
|
else
|
|
debug("user %.100s matched 'User %.100s' at "
|
|
"line %d", ci->user, arg, line);
|
|
} else if (strcasecmp(attrib, "group") == 0) {
|
|
if (ci == NULL || ci->user == NULL) {
|
|
result = 0;
|
|
continue;
|
|
}
|
|
switch (match_cfg_line_group(arg, line, ci->user)) {
|
|
case -1:
|
|
return -1;
|
|
case 0:
|
|
result = 0;
|
|
}
|
|
} else if (strcasecmp(attrib, "host") == 0) {
|
|
if (ci == NULL || ci->host == NULL) {
|
|
result = 0;
|
|
continue;
|
|
}
|
|
if (match_hostname(ci->host, arg, len) != 1)
|
|
result = 0;
|
|
else
|
|
debug("connection from %.100s matched 'Host "
|
|
"%.100s' at line %d", ci->host, arg, line);
|
|
} else if (strcasecmp(attrib, "address") == 0) {
|
|
if (ci == NULL || ci->address == NULL) {
|
|
result = 0;
|
|
continue;
|
|
}
|
|
switch (addr_match_list(ci->address, arg)) {
|
|
case 1:
|
|
debug("connection from %.100s matched 'Address "
|
|
"%.100s' at line %d", ci->address, arg, line);
|
|
break;
|
|
case 0:
|
|
case -1:
|
|
result = 0;
|
|
break;
|
|
case -2:
|
|
return -1;
|
|
}
|
|
} else if (strcasecmp(attrib, "localaddress") == 0){
|
|
if (ci == NULL || ci->laddress == NULL) {
|
|
result = 0;
|
|
continue;
|
|
}
|
|
switch (addr_match_list(ci->laddress, arg)) {
|
|
case 1:
|
|
debug("connection from %.100s matched "
|
|
"'LocalAddress %.100s' at line %d",
|
|
ci->laddress, arg, line);
|
|
break;
|
|
case 0:
|
|
case -1:
|
|
result = 0;
|
|
break;
|
|
case -2:
|
|
return -1;
|
|
}
|
|
} else if (strcasecmp(attrib, "localport") == 0) {
|
|
if ((port = a2port(arg)) == -1) {
|
|
error("Invalid LocalPort '%s' on Match line",
|
|
arg);
|
|
return -1;
|
|
}
|
|
if (ci == NULL || ci->lport == 0) {
|
|
result = 0;
|
|
continue;
|
|
}
|
|
/* TODO support port lists */
|
|
if (port == ci->lport)
|
|
debug("connection from %.100s matched "
|
|
"'LocalPort %d' at line %d",
|
|
ci->laddress, port, line);
|
|
else
|
|
result = 0;
|
|
} else {
|
|
error("Unsupported Match attribute %s", attrib);
|
|
return -1;
|
|
}
|
|
}
|
|
if (attributes == 0) {
|
|
error("One or more attributes required for Match");
|
|
return -1;
|
|
}
|
|
if (ci != NULL)
|
|
debug3("match %sfound", result ? "" : "not ");
|
|
*condition = cp;
|
|
return result;
|
|
}
|
|
|
|
#define WHITESPACE " \t\r\n"
|
|
|
|
/* Multistate option parsing */
|
|
struct multistate {
|
|
char *key;
|
|
int value;
|
|
};
|
|
static const struct multistate multistate_addressfamily[] = {
|
|
{ "inet", AF_INET },
|
|
{ "inet6", AF_INET6 },
|
|
{ "any", AF_UNSPEC },
|
|
{ NULL, -1 }
|
|
};
|
|
static const struct multistate multistate_permitrootlogin[] = {
|
|
{ "without-password", PERMIT_NO_PASSWD },
|
|
{ "forced-commands-only", PERMIT_FORCED_ONLY },
|
|
{ "yes", PERMIT_YES },
|
|
{ "no", PERMIT_NO },
|
|
{ NULL, -1 }
|
|
};
|
|
static const struct multistate multistate_compression[] = {
|
|
{ "delayed", COMP_DELAYED },
|
|
{ "yes", COMP_ZLIB },
|
|
{ "no", COMP_NONE },
|
|
{ NULL, -1 }
|
|
};
|
|
static const struct multistate multistate_gatewayports[] = {
|
|
{ "clientspecified", 2 },
|
|
{ "yes", 1 },
|
|
{ "no", 0 },
|
|
{ NULL, -1 }
|
|
};
|
|
static const struct multistate multistate_privsep[] = {
|
|
{ "yes", PRIVSEP_NOSANDBOX },
|
|
{ "sandbox", PRIVSEP_ON },
|
|
{ "nosandbox", PRIVSEP_NOSANDBOX },
|
|
{ "no", PRIVSEP_OFF },
|
|
{ NULL, -1 }
|
|
};
|
|
static const struct multistate multistate_tcpfwd[] = {
|
|
{ "yes", FORWARD_ALLOW },
|
|
{ "all", FORWARD_ALLOW },
|
|
{ "no", FORWARD_DENY },
|
|
{ "remote", FORWARD_REMOTE },
|
|
{ "local", FORWARD_LOCAL },
|
|
{ NULL, -1 }
|
|
};
|
|
|
|
int
|
|
process_server_config_line(ServerOptions *options, char *line,
|
|
const char *filename, int linenum, int *activep,
|
|
struct connection_info *connectinfo)
|
|
{
|
|
char *cp, **charptr, *arg, *p;
|
|
int cmdline = 0, *intptr, value, value2, n, port;
|
|
SyslogFacility *log_facility_ptr;
|
|
LogLevel *log_level_ptr;
|
|
ServerOpCodes opcode;
|
|
u_int i, flags = 0;
|
|
size_t len;
|
|
long long val64;
|
|
const struct multistate *multistate_ptr;
|
|
|
|
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 (connectinfo == 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:
|
|
intptr = &options->address_family;
|
|
multistate_ptr = multistate_addressfamily;
|
|
if (options->listen_addrs != NULL)
|
|
fatal("%s line %d: address family must be specified "
|
|
"before ListenAddress.", filename, linenum);
|
|
parse_multistate:
|
|
arg = strdelim(&cp);
|
|
if (!arg || *arg == '\0')
|
|
fatal("%s line %d: missing argument.",
|
|
filename, linenum);
|
|
value = -1;
|
|
for (i = 0; multistate_ptr[i].key != NULL; i++) {
|
|
if (strcasecmp(arg, multistate_ptr[i].key) == 0) {
|
|
value = multistate_ptr[i].value;
|
|
break;
|
|
}
|
|
}
|
|
if (value == -1)
|
|
fatal("%s line %d: unsupported option \"%s\".",
|
|
filename, linenum, arg);
|
|
if (*activep && *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 = derelativise_path(arg);
|
|
/* increase optional counter */
|
|
if (intptr != NULL)
|
|
*intptr = *intptr + 1;
|
|
}
|
|
break;
|
|
|
|
case sHostKeyAgent:
|
|
charptr = &options->host_key_agent;
|
|
arg = strdelim(&cp);
|
|
if (!arg || *arg == '\0')
|
|
fatal("%s line %d: missing socket name.",
|
|
filename, linenum);
|
|
if (*activep && *charptr == NULL)
|
|
*charptr = !strcmp(arg, SSH_AUTHSOCKET_ENV_NAME) ?
|
|
xstrdup(arg) : derelativise_path(arg);
|
|
break;
|
|
|
|
case sHostCertificate:
|
|
intptr = &options->num_host_cert_files;
|
|
if (*intptr >= MAX_HOSTKEYS)
|
|
fatal("%s line %d: too many host certificates "
|
|
"specified (max %d).", filename, linenum,
|
|
MAX_HOSTCERTS);
|
|
charptr = &options->host_cert_files[*intptr];
|
|
goto parse_filename;
|
|
break;
|
|
|
|
case sPidFile:
|
|
charptr = &options->pid_file;
|
|
goto parse_filename;
|
|
|
|
case sPermitRootLogin:
|
|
intptr = &options->permit_root_login;
|
|
multistate_ptr = multistate_permitrootlogin;
|
|
goto parse_multistate;
|
|
|
|
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 sHostbasedAcceptedKeyTypes:
|
|
charptr = &options->hostbased_key_types;
|
|
parse_keytypes:
|
|
arg = strdelim(&cp);
|
|
if (!arg || *arg == '\0')
|
|
fatal("%s line %d: Missing argument.",
|
|
filename, linenum);
|
|
if (!sshkey_names_valid2(arg, 1))
|
|
fatal("%s line %d: Bad key types '%s'.",
|
|
filename, linenum, arg ? arg : "<NONE>");
|
|
if (*activep && *charptr == NULL)
|
|
*charptr = xstrdup(arg);
|
|
break;
|
|
|
|
case sRSAAuthentication:
|
|
intptr = &options->rsa_authentication;
|
|
goto parse_flag;
|
|
|
|
case sPubkeyAuthentication:
|
|
intptr = &options->pubkey_authentication;
|
|
goto parse_flag;
|
|
|
|
case sPubkeyAcceptedKeyTypes:
|
|
charptr = &options->pubkey_key_types;
|
|
goto parse_keytypes;
|
|
|
|
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 sPermitTTY:
|
|
intptr = &options->permit_tty;
|
|
goto parse_flag;
|
|
|
|
case sPermitUserRC:
|
|
intptr = &options->permit_user_rc;
|
|
goto parse_flag;
|
|
|
|
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;
|
|
multistate_ptr = multistate_compression;
|
|
goto parse_multistate;
|
|
|
|
case sRekeyLimit:
|
|
arg = strdelim(&cp);
|
|
if (!arg || *arg == '\0')
|
|
fatal("%.200s line %d: Missing argument.", filename,
|
|
linenum);
|
|
if (strcmp(arg, "default") == 0) {
|
|
val64 = 0;
|
|
} else {
|
|
if (scan_scaled(arg, &val64) == -1)
|
|
fatal("%.200s line %d: Bad number '%s': %s",
|
|
filename, linenum, arg, strerror(errno));
|
|
/* check for too-large or too-small limits */
|
|
if (val64 > UINT_MAX)
|
|
fatal("%.200s line %d: RekeyLimit too large",
|
|
filename, linenum);
|
|
if (val64 != 0 && val64 < 16)
|
|
fatal("%.200s line %d: RekeyLimit too small",
|
|
filename, linenum);
|
|
}
|
|
if (*activep && options->rekey_limit == -1)
|
|
options->rekey_limit = (u_int32_t)val64;
|
|
if (cp != NULL) { /* optional rekey interval present */
|
|
if (strcmp(cp, "none") == 0) {
|
|
(void)strdelim(&cp); /* discard */
|
|
break;
|
|
}
|
|
intptr = &options->rekey_interval;
|
|
goto parse_time;
|
|
}
|
|
break;
|
|
|
|
case sGatewayPorts:
|
|
intptr = &options->fwd_opts.gateway_ports;
|
|
multistate_ptr = multistate_gatewayports;
|
|
goto parse_multistate;
|
|
|
|
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;
|
|
multistate_ptr = multistate_tcpfwd;
|
|
goto parse_multistate;
|
|
|
|
case sAllowStreamLocalForwarding:
|
|
intptr = &options->allow_streamlocal_forwarding;
|
|
multistate_ptr = multistate_tcpfwd;
|
|
goto parse_multistate;
|
|
|
|
case sAllowAgentForwarding:
|
|
intptr = &options->allow_agent_forwarding;
|
|
goto parse_flag;
|
|
|
|
case sUsePrivilegeSeparation:
|
|
intptr = &use_privsep;
|
|
multistate_ptr = multistate_privsep;
|
|
goto parse_multistate;
|
|
|
|
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);
|
|
if (!*activep)
|
|
continue;
|
|
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);
|
|
if (!*activep)
|
|
continue;
|
|
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);
|
|
if (!*activep)
|
|
continue;
|
|
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);
|
|
if (!*activep)
|
|
continue;
|
|
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 sKexAlgorithms:
|
|
arg = strdelim(&cp);
|
|
if (!arg || *arg == '\0')
|
|
fatal("%s line %d: Missing argument.",
|
|
filename, linenum);
|
|
if (!kex_names_valid(arg))
|
|
fatal("%s line %d: Bad SSH2 KexAlgorithms '%s'.",
|
|
filename, linenum, arg ? arg : "<NONE>");
|
|
if (options->kex_algorithms == NULL)
|
|
options->kex_algorithms = 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:
|
|
if (*activep && options->num_authkeys_files == 0) {
|
|
while ((arg = strdelim(&cp)) && *arg != '\0') {
|
|
if (options->num_authkeys_files >=
|
|
MAX_AUTHKEYS_FILES)
|
|
fatal("%s line %d: "
|
|
"too many authorized keys files.",
|
|
filename, linenum);
|
|
options->authorized_keys_files[
|
|
options->num_authkeys_files++] =
|
|
tilde_expand_filename(arg, getuid());
|
|
}
|
|
}
|
|
return 0;
|
|
|
|
case sAuthorizedPrincipalsFile:
|
|
charptr = &options->authorized_principals_file;
|
|
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 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)
|
|
continue;
|
|
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 = -1;
|
|
for (i = 0; tunmode_desc[i].val != -1; i++)
|
|
if (strcmp(tunmode_desc[i].text, arg) == 0) {
|
|
value = tunmode_desc[i].val;
|
|
break;
|
|
}
|
|
if (value == -1)
|
|
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, connectinfo);
|
|
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 (strcmp(arg, "none") == 0) {
|
|
if (*activep && n == -1) {
|
|
options->num_permitted_opens = 1;
|
|
channel_disable_adm_local_opens();
|
|
}
|
|
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 = permitopen_port(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 sTrustedUserCAKeys:
|
|
charptr = &options->trusted_user_ca_keys;
|
|
goto parse_filename;
|
|
|
|
case sRevokedKeys:
|
|
charptr = &options->revoked_keys_file;
|
|
goto parse_filename;
|
|
|
|
case sIPQoS:
|
|
arg = strdelim(&cp);
|
|
if ((value = parse_ipqos(arg)) == -1)
|
|
fatal("%s line %d: Bad IPQoS value: %s",
|
|
filename, linenum, arg);
|
|
arg = strdelim(&cp);
|
|
if (arg == NULL)
|
|
value2 = value;
|
|
else if ((value2 = parse_ipqos(arg)) == -1)
|
|
fatal("%s line %d: Bad IPQoS value: %s",
|
|
filename, linenum, arg);
|
|
if (*activep) {
|
|
options->ip_qos_interactive = value;
|
|
options->ip_qos_bulk = value2;
|
|
}
|
|
break;
|
|
|
|
case sVersionAddendum:
|
|
if (cp == NULL)
|
|
fatal("%.200s line %d: Missing argument.", filename,
|
|
linenum);
|
|
len = strspn(cp, WHITESPACE);
|
|
if (*activep && options->version_addendum == NULL) {
|
|
if (strcasecmp(cp + len, "none") == 0)
|
|
options->version_addendum = xstrdup("");
|
|
else if (strchr(cp + len, '\r') != NULL)
|
|
fatal("%.200s line %d: Invalid argument",
|
|
filename, linenum);
|
|
else
|
|
options->version_addendum = xstrdup(cp + len);
|
|
}
|
|
return 0;
|
|
|
|
case sAuthorizedKeysCommand:
|
|
if (cp == NULL)
|
|
fatal("%.200s line %d: Missing argument.", filename,
|
|
linenum);
|
|
len = strspn(cp, WHITESPACE);
|
|
if (*activep && options->authorized_keys_command == NULL) {
|
|
if (cp[len] != '/' && strcasecmp(cp + len, "none") != 0)
|
|
fatal("%.200s line %d: AuthorizedKeysCommand "
|
|
"must be an absolute path",
|
|
filename, linenum);
|
|
options->authorized_keys_command = xstrdup(cp + len);
|
|
}
|
|
return 0;
|
|
|
|
case sAuthorizedKeysCommandUser:
|
|
charptr = &options->authorized_keys_command_user;
|
|
|
|
arg = strdelim(&cp);
|
|
if (!arg || *arg == '\0')
|
|
fatal("%s line %d: missing AuthorizedKeysCommandUser "
|
|
"argument.", filename, linenum);
|
|
if (*activep && *charptr == NULL)
|
|
*charptr = xstrdup(arg);
|
|
break;
|
|
|
|
case sAuthenticationMethods:
|
|
if (*activep && options->num_auth_methods == 0) {
|
|
while ((arg = strdelim(&cp)) && *arg != '\0') {
|
|
if (options->num_auth_methods >=
|
|
MAX_AUTH_METHODS)
|
|
fatal("%s line %d: "
|
|
"too many authentication methods.",
|
|
filename, linenum);
|
|
if (auth2_methods_valid(arg, 0) != 0)
|
|
fatal("%s line %d: invalid "
|
|
"authentication method list.",
|
|
filename, linenum);
|
|
options->auth_methods[
|
|
options->num_auth_methods++] = xstrdup(arg);
|
|
}
|
|
}
|
|
return 0;
|
|
|
|
case sStreamLocalBindMask:
|
|
arg = strdelim(&cp);
|
|
if (!arg || *arg == '\0')
|
|
fatal("%s line %d: missing StreamLocalBindMask argument.",
|
|
filename, linenum);
|
|
/* Parse mode in octal format */
|
|
value = strtol(arg, &p, 8);
|
|
if (arg == p || value < 0 || value > 0777)
|
|
fatal("%s line %d: Bad mask.", filename, linenum);
|
|
options->fwd_opts.streamlocal_bind_mask = (mode_t)value;
|
|
break;
|
|
|
|
case sStreamLocalBindUnlink:
|
|
intptr = &options->fwd_opts.streamlocal_bind_unlink;
|
|
goto parse_flag;
|
|
|
|
case sFingerprintHash:
|
|
arg = strdelim(&cp);
|
|
if (!arg || *arg == '\0')
|
|
fatal("%.200s line %d: Missing argument.",
|
|
filename, linenum);
|
|
if ((value = ssh_digest_alg_by_name(arg)) == -1)
|
|
fatal("%.200s line %d: Invalid hash algorithm \"%s\".",
|
|
filename, linenum, arg);
|
|
if (*activep)
|
|
options->fingerprint_hash = value;
|
|
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[4096], *cp;
|
|
FILE *f;
|
|
int lineno = 0;
|
|
|
|
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)) {
|
|
lineno++;
|
|
if (strlen(line) == sizeof(line) - 1)
|
|
fatal("%s line %d too long", filename, lineno);
|
|
/*
|
|
* 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,
|
|
struct connection_info *connectinfo)
|
|
{
|
|
ServerOptions mo;
|
|
|
|
initialize_server_options(&mo);
|
|
parse_server_config(&mo, "reprocess config", &cfg, connectinfo);
|
|
copy_set_server_options(options, &mo, 0);
|
|
}
|
|
|
|
int parse_server_match_testspec(struct connection_info *ci, char *spec)
|
|
{
|
|
char *p;
|
|
|
|
while ((p = strsep(&spec, ",")) && *p != '\0') {
|
|
if (strncmp(p, "addr=", 5) == 0) {
|
|
ci->address = xstrdup(p + 5);
|
|
} else if (strncmp(p, "host=", 5) == 0) {
|
|
ci->host = xstrdup(p + 5);
|
|
} else if (strncmp(p, "user=", 5) == 0) {
|
|
ci->user = xstrdup(p + 5);
|
|
} else if (strncmp(p, "laddr=", 6) == 0) {
|
|
ci->laddress = xstrdup(p + 6);
|
|
} else if (strncmp(p, "lport=", 6) == 0) {
|
|
ci->lport = a2port(p + 6);
|
|
if (ci->lport == -1) {
|
|
fprintf(stderr, "Invalid port '%s' in test mode"
|
|
" specification %s\n", p+6, p);
|
|
return -1;
|
|
}
|
|
} else {
|
|
fprintf(stderr, "Invalid test mode specification %s\n",
|
|
p);
|
|
return -1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* returns 1 for a complete spec, 0 for partial spec and -1 for an
|
|
* empty spec.
|
|
*/
|
|
int server_match_spec_complete(struct connection_info *ci)
|
|
{
|
|
if (ci->user && ci->host && ci->address)
|
|
return 1; /* complete */
|
|
if (!ci->user && !ci->host && !ci->address)
|
|
return -1; /* empty */
|
|
return 0; /* partial */
|
|
}
|
|
|
|
/*
|
|
* Copy any supported values that are set.
|
|
*
|
|
* If the preauth flag is set, we do not bother copying 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)
|
|
{
|
|
#define M_CP_INTOPT(n) do {\
|
|
if (src->n != -1) \
|
|
dst->n = src->n; \
|
|
} while (0)
|
|
|
|
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(hostbased_uses_name_from_packet_only);
|
|
M_CP_INTOPT(kbd_interactive_authentication);
|
|
M_CP_INTOPT(permit_root_login);
|
|
M_CP_INTOPT(permit_empty_passwd);
|
|
|
|
M_CP_INTOPT(allow_tcp_forwarding);
|
|
M_CP_INTOPT(allow_streamlocal_forwarding);
|
|
M_CP_INTOPT(allow_agent_forwarding);
|
|
M_CP_INTOPT(permit_tun);
|
|
M_CP_INTOPT(fwd_opts.gateway_ports);
|
|
M_CP_INTOPT(x11_display_offset);
|
|
M_CP_INTOPT(x11_forwarding);
|
|
M_CP_INTOPT(x11_use_localhost);
|
|
M_CP_INTOPT(permit_tty);
|
|
M_CP_INTOPT(permit_user_rc);
|
|
M_CP_INTOPT(max_sessions);
|
|
M_CP_INTOPT(max_authtries);
|
|
M_CP_INTOPT(ip_qos_interactive);
|
|
M_CP_INTOPT(ip_qos_bulk);
|
|
M_CP_INTOPT(rekey_limit);
|
|
M_CP_INTOPT(rekey_interval);
|
|
|
|
/* M_CP_STROPT and M_CP_STRARRAYOPT should not appear before here */
|
|
#define M_CP_STROPT(n) do {\
|
|
if (src->n != NULL && dst->n != src->n) { \
|
|
free(dst->n); \
|
|
dst->n = src->n; \
|
|
} \
|
|
} while(0)
|
|
#define M_CP_STRARRAYOPT(n, num_n) do {\
|
|
if (src->num_n != 0) { \
|
|
for (dst->num_n = 0; dst->num_n < src->num_n; dst->num_n++) \
|
|
dst->n[dst->num_n] = xstrdup(src->n[dst->num_n]); \
|
|
} \
|
|
} while(0)
|
|
|
|
/* See comment in servconf.h */
|
|
COPY_MATCH_STRING_OPTS();
|
|
|
|
/*
|
|
* The only things that should be below this point are string options
|
|
* which are only used after authentication.
|
|
*/
|
|
if (preauth)
|
|
return;
|
|
|
|
M_CP_STROPT(adm_forced_command);
|
|
M_CP_STROPT(chroot_directory);
|
|
}
|
|
|
|
#undef M_CP_INTOPT
|
|
#undef M_CP_STROPT
|
|
#undef M_CP_STRARRAYOPT
|
|
|
|
void
|
|
parse_server_config(ServerOptions *options, const char *filename, Buffer *conf,
|
|
struct connection_info *connectinfo)
|
|
{
|
|
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 = connectinfo ? 0 : 1;
|
|
linenum = 1;
|
|
while ((cp = strsep(&cbuf, "\n")) != NULL) {
|
|
if (process_server_config_line(options, cp, filename,
|
|
linenum++, &active, connectinfo) != 0)
|
|
bad_options++;
|
|
}
|
|
free(obuf);
|
|
if (bad_options > 0)
|
|
fatal("%s: terminating, %d bad configuration options",
|
|
filename, bad_options);
|
|
}
|
|
|
|
static const char *
|
|
fmt_multistate_int(int val, const struct multistate *m)
|
|
{
|
|
u_int i;
|
|
|
|
for (i = 0; m[i].key != NULL; i++) {
|
|
if (m[i].value == val)
|
|
return m[i].key;
|
|
}
|
|
return "UNKNOWN";
|
|
}
|
|
|
|
static const char *
|
|
fmt_intarg(ServerOpCodes code, int val)
|
|
{
|
|
if (val == -1)
|
|
return "unset";
|
|
switch (code) {
|
|
case sAddressFamily:
|
|
return fmt_multistate_int(val, multistate_addressfamily);
|
|
case sPermitRootLogin:
|
|
return fmt_multistate_int(val, multistate_permitrootlogin);
|
|
case sGatewayPorts:
|
|
return fmt_multistate_int(val, multistate_gatewayports);
|
|
case sCompression:
|
|
return fmt_multistate_int(val, multistate_compression);
|
|
case sUsePrivilegeSeparation:
|
|
return fmt_multistate_int(val, multistate_privsep);
|
|
case sAllowTcpForwarding:
|
|
return fmt_multistate_int(val, multistate_tcpfwd);
|
|
case sAllowStreamLocalForwarding:
|
|
return fmt_multistate_int(val, multistate_tcpfwd);
|
|
case sFingerprintHash:
|
|
return ssh_digest_alg_name(val);
|
|
case sProtocol:
|
|
switch (val) {
|
|
case SSH_PROTO_1:
|
|
return "1";
|
|
case SSH_PROTO_2:
|
|
return "2";
|
|
case (SSH_PROTO_1|SSH_PROTO_2):
|
|
return "2,1";
|
|
default:
|
|
return "UNKNOWN";
|
|
}
|
|
default:
|
|
switch (val) {
|
|
case 0:
|
|
return "no";
|
|
case 1:
|
|
return "yes";
|
|
default:
|
|
return "UNKNOWN";
|
|
}
|
|
}
|
|
}
|
|
|
|
static const char *
|
|
lookup_opcode_name(ServerOpCodes code)
|
|
{
|
|
u_int i;
|
|
|
|
for (i = 0; keywords[i].name != NULL; i++)
|
|
if (keywords[i].opcode == code)
|
|
return(keywords[i].name);
|
|
return "UNKNOWN";
|
|
}
|
|
|
|
static void
|
|
dump_cfg_int(ServerOpCodes code, int val)
|
|
{
|
|
printf("%s %d\n", lookup_opcode_name(code), val);
|
|
}
|
|
|
|
static void
|
|
dump_cfg_fmtint(ServerOpCodes code, int val)
|
|
{
|
|
printf("%s %s\n", lookup_opcode_name(code), fmt_intarg(code, val));
|
|
}
|
|
|
|
static void
|
|
dump_cfg_string(ServerOpCodes code, const char *val)
|
|
{
|
|
if (val == NULL)
|
|
return;
|
|
printf("%s %s\n", lookup_opcode_name(code),
|
|
val == NULL ? "none" : val);
|
|
}
|
|
|
|
static void
|
|
dump_cfg_strarray(ServerOpCodes code, u_int count, char **vals)
|
|
{
|
|
u_int i;
|
|
|
|
for (i = 0; i < count; i++)
|
|
printf("%s %s\n", lookup_opcode_name(code), vals[i]);
|
|
}
|
|
|
|
static void
|
|
dump_cfg_strarray_oneline(ServerOpCodes code, u_int count, char **vals)
|
|
{
|
|
u_int i;
|
|
|
|
printf("%s", lookup_opcode_name(code));
|
|
for (i = 0; i < count; i++)
|
|
printf(" %s", vals[i]);
|
|
printf("\n");
|
|
}
|
|
|
|
void
|
|
dump_config(ServerOptions *o)
|
|
{
|
|
u_int i;
|
|
int ret;
|
|
struct addrinfo *ai;
|
|
char addr[NI_MAXHOST], port[NI_MAXSERV], *s = NULL;
|
|
|
|
/* these are usually at the top of the config */
|
|
for (i = 0; i < o->num_ports; i++)
|
|
printf("port %d\n", o->ports[i]);
|
|
dump_cfg_fmtint(sProtocol, o->protocol);
|
|
dump_cfg_fmtint(sAddressFamily, o->address_family);
|
|
|
|
/* ListenAddress must be after Port */
|
|
for (ai = o->listen_addrs; ai; ai = ai->ai_next) {
|
|
if ((ret = getnameinfo(ai->ai_addr, ai->ai_addrlen, addr,
|
|
sizeof(addr), port, sizeof(port),
|
|
NI_NUMERICHOST|NI_NUMERICSERV)) != 0) {
|
|
error("getnameinfo failed: %.100s",
|
|
(ret != EAI_SYSTEM) ? gai_strerror(ret) :
|
|
strerror(errno));
|
|
} else {
|
|
if (ai->ai_family == AF_INET6)
|
|
printf("listenaddress [%s]:%s\n", addr, port);
|
|
else
|
|
printf("listenaddress %s:%s\n", addr, port);
|
|
}
|
|
}
|
|
|
|
/* integer arguments */
|
|
#ifdef USE_PAM
|
|
dump_cfg_int(sUsePAM, o->use_pam);
|
|
#endif
|
|
dump_cfg_int(sServerKeyBits, o->server_key_bits);
|
|
dump_cfg_int(sLoginGraceTime, o->login_grace_time);
|
|
dump_cfg_int(sKeyRegenerationTime, o->key_regeneration_time);
|
|
dump_cfg_int(sX11DisplayOffset, o->x11_display_offset);
|
|
dump_cfg_int(sMaxAuthTries, o->max_authtries);
|
|
dump_cfg_int(sMaxSessions, o->max_sessions);
|
|
dump_cfg_int(sClientAliveInterval, o->client_alive_interval);
|
|
dump_cfg_int(sClientAliveCountMax, o->client_alive_count_max);
|
|
|
|
/* formatted integer arguments */
|
|
dump_cfg_fmtint(sPermitRootLogin, o->permit_root_login);
|
|
dump_cfg_fmtint(sIgnoreRhosts, o->ignore_rhosts);
|
|
dump_cfg_fmtint(sIgnoreUserKnownHosts, o->ignore_user_known_hosts);
|
|
dump_cfg_fmtint(sRhostsRSAAuthentication, o->rhosts_rsa_authentication);
|
|
dump_cfg_fmtint(sHostbasedAuthentication, o->hostbased_authentication);
|
|
dump_cfg_fmtint(sHostbasedUsesNameFromPacketOnly,
|
|
o->hostbased_uses_name_from_packet_only);
|
|
dump_cfg_fmtint(sRSAAuthentication, o->rsa_authentication);
|
|
dump_cfg_fmtint(sPubkeyAuthentication, o->pubkey_authentication);
|
|
#ifdef KRB5
|
|
dump_cfg_fmtint(sKerberosAuthentication, o->kerberos_authentication);
|
|
dump_cfg_fmtint(sKerberosOrLocalPasswd, o->kerberos_or_local_passwd);
|
|
dump_cfg_fmtint(sKerberosTicketCleanup, o->kerberos_ticket_cleanup);
|
|
# ifdef USE_AFS
|
|
dump_cfg_fmtint(sKerberosGetAFSToken, o->kerberos_get_afs_token);
|
|
# endif
|
|
#endif
|
|
#ifdef GSSAPI
|
|
dump_cfg_fmtint(sGssAuthentication, o->gss_authentication);
|
|
dump_cfg_fmtint(sGssCleanupCreds, o->gss_cleanup_creds);
|
|
#endif
|
|
dump_cfg_fmtint(sPasswordAuthentication, o->password_authentication);
|
|
dump_cfg_fmtint(sKbdInteractiveAuthentication,
|
|
o->kbd_interactive_authentication);
|
|
dump_cfg_fmtint(sChallengeResponseAuthentication,
|
|
o->challenge_response_authentication);
|
|
dump_cfg_fmtint(sPrintMotd, o->print_motd);
|
|
dump_cfg_fmtint(sPrintLastLog, o->print_lastlog);
|
|
dump_cfg_fmtint(sX11Forwarding, o->x11_forwarding);
|
|
dump_cfg_fmtint(sX11UseLocalhost, o->x11_use_localhost);
|
|
dump_cfg_fmtint(sPermitTTY, o->permit_tty);
|
|
dump_cfg_fmtint(sPermitUserRC, o->permit_user_rc);
|
|
dump_cfg_fmtint(sStrictModes, o->strict_modes);
|
|
dump_cfg_fmtint(sTCPKeepAlive, o->tcp_keep_alive);
|
|
dump_cfg_fmtint(sEmptyPasswd, o->permit_empty_passwd);
|
|
dump_cfg_fmtint(sPermitUserEnvironment, o->permit_user_env);
|
|
dump_cfg_fmtint(sUseLogin, o->use_login);
|
|
dump_cfg_fmtint(sCompression, o->compression);
|
|
dump_cfg_fmtint(sGatewayPorts, o->fwd_opts.gateway_ports);
|
|
dump_cfg_fmtint(sUseDNS, o->use_dns);
|
|
dump_cfg_fmtint(sAllowTcpForwarding, o->allow_tcp_forwarding);
|
|
dump_cfg_fmtint(sAllowStreamLocalForwarding, o->allow_streamlocal_forwarding);
|
|
dump_cfg_fmtint(sUsePrivilegeSeparation, use_privsep);
|
|
dump_cfg_fmtint(sFingerprintHash, o->fingerprint_hash);
|
|
|
|
/* string arguments */
|
|
dump_cfg_string(sPidFile, o->pid_file);
|
|
dump_cfg_string(sXAuthLocation, o->xauth_location);
|
|
dump_cfg_string(sCiphers, o->ciphers ? o->ciphers : KEX_SERVER_ENCRYPT);
|
|
dump_cfg_string(sMacs, o->macs ? o->macs : KEX_SERVER_MAC);
|
|
dump_cfg_string(sBanner, o->banner);
|
|
dump_cfg_string(sForceCommand, o->adm_forced_command);
|
|
dump_cfg_string(sChrootDirectory, o->chroot_directory);
|
|
dump_cfg_string(sTrustedUserCAKeys, o->trusted_user_ca_keys);
|
|
dump_cfg_string(sRevokedKeys, o->revoked_keys_file);
|
|
dump_cfg_string(sAuthorizedPrincipalsFile,
|
|
o->authorized_principals_file);
|
|
dump_cfg_string(sVersionAddendum, o->version_addendum);
|
|
dump_cfg_string(sAuthorizedKeysCommand, o->authorized_keys_command);
|
|
dump_cfg_string(sAuthorizedKeysCommandUser, o->authorized_keys_command_user);
|
|
dump_cfg_string(sHostKeyAgent, o->host_key_agent);
|
|
dump_cfg_string(sKexAlgorithms,
|
|
o->kex_algorithms ? o->kex_algorithms : KEX_SERVER_KEX);
|
|
dump_cfg_string(sHostbasedAcceptedKeyTypes, o->hostbased_key_types ?
|
|
o->hostbased_key_types : KEX_DEFAULT_PK_ALG);
|
|
dump_cfg_string(sPubkeyAcceptedKeyTypes, o->pubkey_key_types ?
|
|
o->pubkey_key_types : KEX_DEFAULT_PK_ALG);
|
|
|
|
/* string arguments requiring a lookup */
|
|
dump_cfg_string(sLogLevel, log_level_name(o->log_level));
|
|
dump_cfg_string(sLogFacility, log_facility_name(o->log_facility));
|
|
|
|
/* string array arguments */
|
|
dump_cfg_strarray_oneline(sAuthorizedKeysFile, o->num_authkeys_files,
|
|
o->authorized_keys_files);
|
|
dump_cfg_strarray(sHostKeyFile, o->num_host_key_files,
|
|
o->host_key_files);
|
|
dump_cfg_strarray(sHostKeyFile, o->num_host_cert_files,
|
|
o->host_cert_files);
|
|
dump_cfg_strarray(sAllowUsers, o->num_allow_users, o->allow_users);
|
|
dump_cfg_strarray(sDenyUsers, o->num_deny_users, o->deny_users);
|
|
dump_cfg_strarray(sAllowGroups, o->num_allow_groups, o->allow_groups);
|
|
dump_cfg_strarray(sDenyGroups, o->num_deny_groups, o->deny_groups);
|
|
dump_cfg_strarray(sAcceptEnv, o->num_accept_env, o->accept_env);
|
|
dump_cfg_strarray_oneline(sAuthenticationMethods,
|
|
o->num_auth_methods, o->auth_methods);
|
|
|
|
/* other arguments */
|
|
for (i = 0; i < o->num_subsystems; i++)
|
|
printf("subsystem %s %s\n", o->subsystem_name[i],
|
|
o->subsystem_args[i]);
|
|
|
|
printf("maxstartups %d:%d:%d\n", o->max_startups_begin,
|
|
o->max_startups_rate, o->max_startups);
|
|
|
|
for (i = 0; tunmode_desc[i].val != -1; i++)
|
|
if (tunmode_desc[i].val == o->permit_tun) {
|
|
s = tunmode_desc[i].text;
|
|
break;
|
|
}
|
|
dump_cfg_string(sPermitTunnel, s);
|
|
|
|
printf("ipqos %s ", iptos2str(o->ip_qos_interactive));
|
|
printf("%s\n", iptos2str(o->ip_qos_bulk));
|
|
|
|
printf("rekeylimit %lld %d\n", (long long)o->rekey_limit,
|
|
o->rekey_interval);
|
|
|
|
channel_print_adm_permitted_opens();
|
|
}
|