X-Git-Url: http://andersk.mit.edu/gitweb/gssapi-openssh.git/blobdiff_plain/5598e598f2b9714c3b08a211d401c780e74dabe2..99a781071582d870e3aa172c8f3564914b0eeb75:/openssh/servconf.c diff --git a/openssh/servconf.c b/openssh/servconf.c index 461da8d..49139df 100644 --- a/openssh/servconf.c +++ b/openssh/servconf.c @@ -1,3 +1,4 @@ +/* $OpenBSD: servconf.c,v 1.195 2009/04/14 21:10:54 jj Exp $ */ /* * Copyright (c) 1995 Tatu Ylonen , Espoo, Finland * All rights reserved @@ -10,41 +11,43 @@ */ #include "includes.h" -RCSID("$OpenBSD: servconf.c,v 1.91 2001/11/12 18:17:07 markus Exp $"); -#if defined(KRB4) -#include -#endif -#if defined(KRB5) -#ifdef HEIMDAL -#include -#else -/* Bodge - but then, so is using the kerberos IV KEYFILE to get a Kerberos V - * keytab */ -#define KEYFILE "/etc/krb5.keytab" -#endif -#endif -#ifdef AFS -#include -#endif +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "openbsd-compat/sys-queue.h" +#include "xmalloc.h" #include "ssh.h" #include "log.h" +#include "buffer.h" #include "servconf.h" -#include "xmalloc.h" #include "compat.h" #include "pathnames.h" -#include "tildexpand.h" #include "misc.h" #include "cipher.h" +#include "key.h" #include "kex.h" #include "mac.h" +#include "match.h" +#include "channels.h" +#include "groupaccess.h" -static void add_listen_addr(ServerOptions *, char *, u_short); -static void add_one_listen_addr(ServerOptions *, char *, u_short); +static void add_listen_addr(ServerOptions *, char *, int); +static void add_one_listen_addr(ServerOptions *, char *, int); -/* AF_UNSPEC or AF_INET or AF_INET6 */ -extern int IPv4or6; +/* Use of privilege separation or not */ +extern int use_privsep; +extern Buffer cfg; /* Initializes the server options to their default values. */ @@ -54,12 +57,14 @@ initialize_server_options(ServerOptions *options) memset(options, 0, sizeof(*options)); /* Portable-specific options */ - options->pam_authentication_via_kbd_int = -1; + options->use_pam = -1; + options->permit_pam_user_change = -1; /* Standard Options */ options->num_ports = 0; options->ports_from_cmdline = 0; options->listen_addrs = NULL; + options->address_family = -1; options->num_host_key_files = 0; options->pid_file = NULL; options->server_key_bits = -1; @@ -72,40 +77,42 @@ initialize_server_options(ServerOptions *options) options->print_lastlog = -1; options->x11_forwarding = -1; options->x11_display_offset = -1; + options->x11_use_localhost = -1; options->xauth_location = NULL; options->strict_modes = -1; - options->keepalives = -1; - options->log_facility = (SyslogFacility) - 1; - options->log_level = (LogLevel) - 1; - options->rhosts_authentication = -1; + options->tcp_keep_alive = -1; + options->log_facility = SYSLOG_FACILITY_NOT_SET; + options->log_level = SYSLOG_LEVEL_NOT_SET; options->rhosts_rsa_authentication = -1; options->hostbased_authentication = -1; options->hostbased_uses_name_from_packet_only = -1; options->rsa_authentication = -1; options->pubkey_authentication = -1; -#ifdef GSSAPI - options->gss_authentication=-1; - options->gss_keyex=-1; - options->gss_use_session_ccache = -1; - options->gss_cleanup_creds = -1; -#endif -#if defined(KRB4) || defined(KRB5) options->kerberos_authentication = -1; options->kerberos_or_local_passwd = -1; options->kerberos_ticket_cleanup = -1; +#ifdef SESSION_HOOKS + options->session_hooks_allow = -1; + options->session_hooks_startup_cmd = NULL; + options->session_hooks_shutdown_cmd = NULL; #endif -#if defined(AFS) || defined(KRB5) - options->kerberos_tgt_passing = -1; -#endif -#ifdef AFS - options->afs_token_passing = -1; -#endif + options->kerberos_get_afs_token = -1; + options->gss_authentication = -1; + options->gss_deleg_creds = -1; + options->gss_keyex = -1; + options->gss_cleanup_creds = -1; + options->gss_strict_acceptor = -1; + options->gsi_allow_limited_proxy = -1; + options->gss_store_rekey = -1; options->password_authentication = -1; options->kbd_interactive_authentication = -1; options->challenge_response_authentication = -1; options->permit_empty_passwd = -1; + options->permit_user_env = -1; options->use_login = -1; + options->compression = -1; options->allow_tcp_forwarding = -1; + options->allow_agent_forwarding = -1; options->num_allow_users = 0; options->num_deny_users = 0; options->num_allow_groups = 0; @@ -118,20 +125,41 @@ initialize_server_options(ServerOptions *options) options->max_startups_begin = -1; options->max_startups_rate = -1; options->max_startups = -1; + options->max_authtries = -1; + options->max_sessions = -1; options->banner = NULL; - options->reverse_mapping_check = -1; + options->use_dns = -1; options->client_alive_interval = -1; options->client_alive_count_max = -1; options->authorized_keys_file = NULL; options->authorized_keys_file2 = NULL; + options->num_accept_env = 0; + options->permit_tun = -1; + options->num_permitted_opens = -1; + options->adm_forced_command = NULL; + options->chroot_directory = NULL; + options->zero_knowledge_password_authentication = -1; + options->none_enabled = -1; + options->tcp_rcv_buf_poll = -1; + options->hpn_disabled = -1; + options->hpn_buffer_size = -1; + options->disable_usage_stats = 0; + options->usage_stats_targets = NULL; } void fill_default_server_options(ServerOptions *options) { + /* needed for hpn socket tests */ + int sock; + int socksize; + int socksizelen = sizeof(int); + /* Portable-specific options */ - if (options->pam_authentication_via_kbd_int == -1) - options->pam_authentication_via_kbd_int = 0; + if (options->use_pam == -1) + options->use_pam = 0; + if (options->permit_pam_user_change == -1) + options->permit_pam_user_change = 0; /* Standard Options */ if (options->protocol == SSH_PROTO_UNKNOWN) @@ -139,9 +167,14 @@ fill_default_server_options(ServerOptions *options) if (options->num_host_key_files == 0) { /* fill default hostkeys for protocols */ if (options->protocol & SSH_PROTO_1) - options->host_key_files[options->num_host_key_files++] = _PATH_HOST_KEY_FILE; - if (options->protocol & SSH_PROTO_2) - options->host_key_files[options->num_host_key_files++] = _PATH_HOST_DSA_KEY_FILE; + options->host_key_files[options->num_host_key_files++] = + _PATH_HOST_KEY_FILE; + if (options->protocol & SSH_PROTO_2) { + options->host_key_files[options->num_host_key_files++] = + _PATH_HOST_RSA_KEY_FILE; + options->host_key_files[options->num_host_key_files++] = + _PATH_HOST_DSA_KEY_FILE; + } } if (options->num_ports == 0) options->ports[options->num_ports++] = SSH_DEFAULT_PORT; @@ -150,9 +183,9 @@ fill_default_server_options(ServerOptions *options) if (options->pid_file == NULL) options->pid_file = _PATH_SSH_DAEMON_PID_FILE; if (options->server_key_bits == -1) - options->server_key_bits = 768; + options->server_key_bits = 1024; if (options->login_grace_time == -1) - options->login_grace_time = 600; + options->login_grace_time = 120; if (options->key_regeneration_time == -1) options->key_regeneration_time = 3600; if (options->permit_root_login == PERMIT_NOT_SET) @@ -169,20 +202,18 @@ fill_default_server_options(ServerOptions *options) options->x11_forwarding = 0; if (options->x11_display_offset == -1) options->x11_display_offset = 10; -#ifdef _PATH_XAUTH + if (options->x11_use_localhost == -1) + options->x11_use_localhost = 1; if (options->xauth_location == NULL) options->xauth_location = _PATH_XAUTH; -#endif if (options->strict_modes == -1) options->strict_modes = 1; - if (options->keepalives == -1) - options->keepalives = 1; - if (options->log_facility == (SyslogFacility) (-1)) + if (options->tcp_keep_alive == -1) + options->tcp_keep_alive = 1; + if (options->log_facility == SYSLOG_FACILITY_NOT_SET) options->log_facility = SYSLOG_FACILITY_AUTH; - if (options->log_level == (LogLevel) (-1)) + if (options->log_level == SYSLOG_LEVEL_NOT_SET) options->log_level = SYSLOG_LEVEL_INFO; - if (options->rhosts_authentication == -1) - options->rhosts_authentication = 0; if (options->rhosts_rsa_authentication == -1) options->rhosts_rsa_authentication = 0; if (options->hostbased_authentication == -1) @@ -193,32 +224,28 @@ fill_default_server_options(ServerOptions *options) options->rsa_authentication = 1; if (options->pubkey_authentication == -1) options->pubkey_authentication = 1; -#ifdef GSSAPI - if (options->gss_authentication == -1) - options->gss_authentication = 1; - if (options->gss_keyex == -1) - options->gss_keyex =1; - if (options->gss_use_session_ccache == -1) - options->gss_use_session_ccache = 1; - if (options->gss_cleanup_creds == -1) - options->gss_cleanup_creds = 1; -#endif -#if defined(KRB4) || defined(KRB5) if (options->kerberos_authentication == -1) - options->kerberos_authentication = (access(KEYFILE, R_OK) == 0); + options->kerberos_authentication = 0; if (options->kerberos_or_local_passwd == -1) options->kerberos_or_local_passwd = 1; if (options->kerberos_ticket_cleanup == -1) options->kerberos_ticket_cleanup = 1; -#endif -#if defined(AFS) || defined(KRB5) - if (options->kerberos_tgt_passing == -1) - options->kerberos_tgt_passing = 0; -#endif -#ifdef AFS - if (options->afs_token_passing == -1) - options->afs_token_passing = k_hasafs(); -#endif + if (options->kerberos_get_afs_token == -1) + options->kerberos_get_afs_token = 0; + if (options->gss_authentication == -1) + options->gss_authentication = 1; + if (options->gss_deleg_creds == -1) + options->gss_deleg_creds = 1; + if (options->gss_keyex == -1) + options->gss_keyex = 1; + if (options->gss_cleanup_creds == -1) + options->gss_cleanup_creds = 1; + if (options->gss_strict_acceptor == -1) + options->gss_strict_acceptor = 1; + if (options->gsi_allow_limited_proxy == -1) + options->gsi_allow_limited_proxy = 0; + if (options->gss_store_rekey == -1) + options->gss_store_rekey = 0; if (options->password_authentication == -1) options->password_authentication = 1; if (options->kbd_interactive_authentication == -1) @@ -227,10 +254,16 @@ fill_default_server_options(ServerOptions *options) options->challenge_response_authentication = 1; if (options->permit_empty_passwd == -1) options->permit_empty_passwd = 0; + if (options->permit_user_env == -1) + options->permit_user_env = 0; if (options->use_login == -1) options->use_login = 0; + if (options->compression == -1) + options->compression = COMP_DELAYED; if (options->allow_tcp_forwarding == -1) options->allow_tcp_forwarding = 1; + if (options->allow_agent_forwarding == -1) + options->allow_agent_forwarding = 1; if (options->gateway_ports == -1) options->gateway_ports = 0; if (options->max_startups == -1) @@ -239,10 +272,14 @@ fill_default_server_options(ServerOptions *options) options->max_startups_rate = 100; /* 100% */ if (options->max_startups_begin == -1) options->max_startups_begin = options->max_startups; - if (options->reverse_mapping_check == -1) - options->reverse_mapping_check = 0; + if (options->max_authtries == -1) + options->max_authtries = DEFAULT_AUTH_FAIL_MAX; + if (options->max_sessions == -1) + options->max_sessions = DEFAULT_SESSIONS_MAX; + if (options->use_dns == -1) + options->use_dns = 1; if (options->client_alive_interval == -1) - options->client_alive_interval = 0; + options->client_alive_interval = 0; if (options->client_alive_count_max == -1) options->client_alive_count_max = 3; if (options->authorized_keys_file2 == NULL) { @@ -254,122 +291,259 @@ fill_default_server_options(ServerOptions *options) } if (options->authorized_keys_file == NULL) options->authorized_keys_file = _PATH_SSH_USER_PERMITTED_KEYS; + if (options->permit_tun == -1) + options->permit_tun = SSH_TUNMODE_NO; + if (options->zero_knowledge_password_authentication == -1) + options->zero_knowledge_password_authentication = 0; + + if (options->hpn_disabled == -1) + options->hpn_disabled = 0; + + if (options->hpn_buffer_size == -1) { + /* option not explicitly set. Now we have to figure out */ + /* what value to use */ + if (options->hpn_disabled == 1) { + options->hpn_buffer_size = CHAN_SES_WINDOW_DEFAULT; + } else { + /* get the current RCV size and set it to that */ + /*create a socket but don't connect it */ + /* we use that the get the rcv socket size */ + sock = socket(AF_INET, SOCK_STREAM, 0); + getsockopt(sock, SOL_SOCKET, SO_RCVBUF, + &socksize, &socksizelen); + close(sock); + options->hpn_buffer_size = socksize; + debug ("HPN Buffer Size: %d", options->hpn_buffer_size); + + } + } else { + /* we have to do this incase the user sets both values in a contradictory */ + /* manner. hpn_disabled overrrides hpn_buffer_size*/ + if (options->hpn_disabled <= 0) { + if (options->hpn_buffer_size == 0) + options->hpn_buffer_size = 1; + /* limit the maximum buffer to 64MB */ + if (options->hpn_buffer_size > 64*1024) { + options->hpn_buffer_size = 64*1024*1024; + } else { + options->hpn_buffer_size *= 1024; + } + } else + options->hpn_buffer_size = CHAN_TCP_WINDOW_DEFAULT; + } + + /* Turn privilege separation on by default */ + if (use_privsep == -1) + use_privsep = 1; + +#ifndef HAVE_MMAP + if (use_privsep && options->compression == 1) { + error("This platform does not support both privilege " + "separation and compression"); + error("Compression disabled"); + options->compression = 0; + } +#endif } /* Keyword tokens. */ typedef enum { sBadOption, /* == unknown option */ /* Portable-specific options */ - sPAMAuthenticationViaKbdInt, + sUsePAM, sPermitPAMUserChange, /* Standard Options */ sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime, sPermitRootLogin, sLogFacility, sLogLevel, - sRhostsAuthentication, sRhostsRSAAuthentication, sRSAAuthentication, -#ifdef GSSAPI - sGssAuthentication, sGssKeyEx, sGssUseSessionCredCache, sGssCleanupCreds, -#endif -#if defined(KRB4) || defined(KRB5) + sRhostsRSAAuthentication, sRSAAuthentication, sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup, + sKerberosGetAFSToken, + sKerberosTgtPassing, sChallengeResponseAuthentication, +#ifdef SESSION_HOOKS + sAllowSessionHooks, sSessionHookStartupCmd, sSessionHookShutdownCmd, #endif -#if defined(AFS) || defined(KRB5) - sKerberosTgtPassing, -#endif -#ifdef AFS - sAFSTokenPassing, -#endif - sChallengeResponseAuthentication, - sPasswordAuthentication, sKbdInteractiveAuthentication, sListenAddress, + sPasswordAuthentication, sKbdInteractiveAuthentication, + sListenAddress, sAddressFamily, sPrintMotd, sPrintLastLog, sIgnoreRhosts, - sX11Forwarding, sX11DisplayOffset, - sStrictModes, sEmptyPasswd, sKeepAlives, - sUseLogin, sAllowTcpForwarding, + sX11Forwarding, sX11DisplayOffset, sX11UseLocalhost, + sStrictModes, sEmptyPasswd, sTCPKeepAlive, + sPermitUserEnvironment, sUseLogin, sAllowTcpForwarding, sCompression, sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups, sIgnoreUserKnownHosts, sCiphers, sMacs, sProtocol, sPidFile, - sGatewayPorts, sPubkeyAuthentication, sXAuthLocation, sSubsystem, sMaxStartups, - sBanner, sReverseMappingCheck, sHostbasedAuthentication, - sHostbasedUsesNameFromPacketOnly, sClientAliveInterval, + sGatewayPorts, sPubkeyAuthentication, sXAuthLocation, sSubsystem, + sMaxStartups, sMaxAuthTries, sMaxSessions, + sBanner, sUseDNS, sHostbasedAuthentication, + sHostbasedUsesNameFromPacketOnly, sClientAliveInterval, sClientAliveCountMax, sAuthorizedKeysFile, sAuthorizedKeysFile2, - sDeprecated + sGssDelegateCreds, + sGssCredsPath, + sGsiAllowLimitedProxy, + sGssAuthentication, sGssCleanupCreds, sGssStrictAcceptor, + sGssKeyEx, sGssStoreRekey, + sAcceptEnv, sPermitTunnel, + sMatch, sPermitOpen, sForceCommand, sChrootDirectory, + sUsePrivilegeSeparation, sAllowAgentForwarding, + sZeroKnowledgePasswordAuthentication, + sNoneEnabled, sTcpRcvBufPoll, sHPNDisabled, sHPNBufferSize, + sDisUsageStats, sUsageStatsTarg, + sDeprecated, sUnsupported } ServerOpCodes; +#define SSHCFG_GLOBAL 0x01 /* allowed in main section of sshd_config */ +#define SSHCFG_MATCH 0x02 /* allowed inside a Match section */ +#define SSHCFG_ALL (SSHCFG_GLOBAL|SSHCFG_MATCH) + /* Textual representation of the tokens. */ static struct { const char *name; ServerOpCodes opcode; + u_int flags; } keywords[] = { /* Portable-specific options */ - { "PAMAuthenticationViaKbdInt", sPAMAuthenticationViaKbdInt }, +#ifdef USE_PAM + { "usepam", sUsePAM, SSHCFG_GLOBAL }, + { "permitpamuserchange", sPermitPAMUserChange, SSHCFG_GLOBAL }, +#else + { "usepam", sUnsupported, SSHCFG_GLOBAL }, + { "permitpamuserchange", sUnsupported, SSHCFG_GLOBAL }, +#endif + { "pamauthenticationviakbdint", sDeprecated, SSHCFG_GLOBAL }, /* Standard Options */ - { "port", sPort }, - { "hostkey", sHostKeyFile }, - { "hostdsakey", sHostKeyFile }, /* alias */ - { "pidfile", sPidFile }, - { "serverkeybits", sServerKeyBits }, - { "logingracetime", sLoginGraceTime }, - { "keyregenerationinterval", sKeyRegenerationTime }, - { "permitrootlogin", sPermitRootLogin }, - { "syslogfacility", sLogFacility }, - { "loglevel", sLogLevel }, - { "rhostsauthentication", sRhostsAuthentication }, - { "rhostsrsaauthentication", sRhostsRSAAuthentication }, - { "hostbasedauthentication", sHostbasedAuthentication }, - { "hostbasedusesnamefrompacketonly", sHostbasedUsesNameFromPacketOnly }, - { "rsaauthentication", sRSAAuthentication }, - { "pubkeyauthentication", sPubkeyAuthentication }, - { "dsaauthentication", sPubkeyAuthentication }, /* alias */ + { "port", sPort, SSHCFG_GLOBAL }, + { "hostkey", sHostKeyFile, SSHCFG_GLOBAL }, + { "hostdsakey", sHostKeyFile, SSHCFG_GLOBAL }, /* alias */ + { "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_GLOBAL }, + { "rsaauthentication", sRSAAuthentication, SSHCFG_ALL }, + { "pubkeyauthentication", sPubkeyAuthentication, 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 }, - { "gssapikeyexchange", sGssKeyEx }, - { "gssusesessionccache", sGssUseSessionCredCache }, - { "gssapiusesessioncredcache", sGssUseSessionCredCache }, - { "gssapicleanupcreds", sGssCleanupCreds }, + { "gssapiauthentication", sGssAuthentication, SSHCFG_ALL }, + { "gssapidelegatecredentials", sGssDelegateCreds, SSHCFG_ALL }, + { "gssapicleanupcredentials", sGssCleanupCreds, SSHCFG_GLOBAL }, + { "gssapicredentialspath", sGssCredsPath, SSHCFG_GLOBAL }, +#ifdef GSI + { "gsiallowlimitedproxy", sGsiAllowLimitedProxy, SSHCFG_GLOBAL }, #endif -#if defined(KRB4) || defined(KRB5) - { "kerberosauthentication", sKerberosAuthentication }, - { "kerberosorlocalpasswd", sKerberosOrLocalPasswd }, - { "kerberosticketcleanup", sKerberosTicketCleanup }, + { "gssapistrictacceptorcheck", sGssStrictAcceptor, SSHCFG_GLOBAL }, + { "gssapikeyexchange", sGssKeyEx, SSHCFG_GLOBAL }, + { "gssapistorecredentialsonrekey", sGssStoreRekey, SSHCFG_GLOBAL }, +#else + { "gssapiauthentication", sUnsupported, SSHCFG_ALL }, + { "gssapidelegatecredentials", sUnsupported, SSHCFG_ALL }, + { "gssapicleanupcredentials", sUnsupported, SSHCFG_GLOBAL }, + { "gssapicredentialspath", sUnsupported, SSHCFG_GLOBAL }, +#ifdef GSI + { "gsiallowlimitedproxy", sUnsupported, SSHCFG_GLOBAL }, #endif -#if defined(AFS) || defined(KRB5) - { "kerberostgtpassing", sKerberosTgtPassing }, + { "gssapistrictacceptorcheck", sUnsupported, SSHCFG_GLOBAL }, + { "gssapikeyexchange", sUnsupported, SSHCFG_GLOBAL }, + { "gssapistorecredentialsonrekey", sUnsupported, SSHCFG_GLOBAL }, #endif -#ifdef AFS - { "afstokenpassing", sAFSTokenPassing }, +#ifdef SESSION_HOOKS + { "allowsessionhooks", sAllowSessionHooks, SSHCFG_GLOBAL }, + { "sessionhookstartupcmd", sSessionHookStartupCmd, SSHCFG_GLOBAL }, + { "sessionhookshutdowncmd", sSessionHookShutdownCmd, SSHCFG_GLOBAL }, +#endif + { "passwordauthentication", sPasswordAuthentication, SSHCFG_ALL }, + { "kbdinteractiveauthentication", sKbdInteractiveAuthentication, SSHCFG_ALL }, + { "challengeresponseauthentication", sChallengeResponseAuthentication, SSHCFG_GLOBAL }, + { "skeyauthentication", sChallengeResponseAuthentication, SSHCFG_GLOBAL }, /* alias */ +#ifdef JPAKE + { "zeroknowledgepasswordauthentication", sZeroKnowledgePasswordAuthentication, SSHCFG_ALL }, +#else + { "zeroknowledgepasswordauthentication", sUnsupported, SSHCFG_ALL }, #endif - { "passwordauthentication", sPasswordAuthentication }, - { "kbdinteractiveauthentication", sKbdInteractiveAuthentication }, - { "challengeresponseauthentication", sChallengeResponseAuthentication }, - { "skeyauthentication", sChallengeResponseAuthentication }, /* alias */ - { "checkmail", sDeprecated }, - { "listenaddress", sListenAddress }, - { "printmotd", sPrintMotd }, - { "printlastlog", sPrintLastLog }, - { "ignorerhosts", sIgnoreRhosts }, - { "ignoreuserknownhosts", sIgnoreUserKnownHosts }, - { "x11forwarding", sX11Forwarding }, - { "x11displayoffset", sX11DisplayOffset }, - { "xauthlocation", sXAuthLocation }, - { "strictmodes", sStrictModes }, - { "permitemptypasswords", sEmptyPasswd }, - { "uselogin", sUseLogin }, - { "keepalive", sKeepAlives }, - { "allowtcpforwarding", sAllowTcpForwarding }, - { "allowusers", sAllowUsers }, - { "denyusers", sDenyUsers }, - { "allowgroups", sAllowGroups }, - { "denygroups", sDenyGroups }, - { "ciphers", sCiphers }, - { "macs", sMacs }, - { "protocol", sProtocol }, - { "gatewayports", sGatewayPorts }, - { "subsystem", sSubsystem }, - { "maxstartups", sMaxStartups }, - { "banner", sBanner }, - { "reversemappingcheck", sReverseMappingCheck }, - { "clientaliveinterval", sClientAliveInterval }, - { "clientalivecountmax", sClientAliveCountMax }, - { "authorizedkeysfile", sAuthorizedKeysFile }, - { "authorizedkeysfile2", sAuthorizedKeysFile2 }, - { NULL, 0 } + { "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 }, + { "tcpkeepalive", sTCPKeepAlive, SSHCFG_GLOBAL }, + { "keepalive", sTCPKeepAlive, SSHCFG_GLOBAL }, /* obsolete alias */ + { "allowtcpforwarding", sAllowTcpForwarding, SSHCFG_ALL }, + { "allowagentforwarding", sAllowAgentForwarding, SSHCFG_ALL }, + { "allowusers", sAllowUsers, SSHCFG_GLOBAL }, + { "denyusers", sDenyUsers, SSHCFG_GLOBAL }, + { "allowgroups", sAllowGroups, SSHCFG_GLOBAL }, + { "denygroups", sDenyGroups, SSHCFG_GLOBAL }, + { "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_GLOBAL }, + { "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 }, + { "noneenabled", sNoneEnabled }, + { "hpndisabled", sHPNDisabled }, + { "hpnbuffersize", sHPNBufferSize }, + { "tcprcvbufpoll", sTcpRcvBufPoll }, + { "disableusagestats", sDisUsageStats, SSHCFG_GLOBAL}, + { "usagestatstargets", sUsageStatsTarg, 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 } }; /* @@ -378,13 +552,16 @@ static struct { static ServerOpCodes parse_token(const char *cp, const char *filename, - int linenum) + int linenum, u_int *flags) { u_int i; for (i = 0; keywords[i].name; i++) - if (strcasecmp(cp, keywords[i].name) == 0) + if (strcasecmp(cp, keywords[i].name) == 0) { + debug ("Config token is %s", keywords[i].name); + *flags = keywords[i].flags; return keywords[i].opcode; + } error("%s: line %d: Bad configuration option: %s", filename, linenum, cp); @@ -392,12 +569,14 @@ parse_token(const char *cp, const char *filename, } static void -add_listen_addr(ServerOptions *options, char *addr, u_short port) +add_listen_addr(ServerOptions *options, char *addr, int port) { - int i; + 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]); @@ -406,525 +585,1281 @@ add_listen_addr(ServerOptions *options, char *addr, u_short port) } static void -add_one_listen_addr(ServerOptions *options, char *addr, u_short port) +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 = IPv4or6; + 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 : "", - gai_strerror(gaierr)); + ssh_gai_strerror(gaierr)); for (ai = aitop; ai->ai_next; ai = ai->ai_next) ; ai->ai_next = options->listen_addrs; options->listen_addrs = aitop; } -/* Reads the server configuration file. */ +/* + * 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 + */ -void -read_server_config(ServerOptions *options, const char *filename) +static int +match_cfg_line_group(const char *grps, int line, const char *user) { - FILE *f; - char line[1024]; - char *cp, **charptr, *arg, *p; - int linenum, *intptr, value; - int bad_options = 0; - ServerOpCodes opcode; - int i, n; + 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; +} - f = fopen(filename, "r"); - if (!f) { - perror(filename); - exit(1); +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) { + switch (addr_match_list(address, arg)) { + case 1: + debug("connection from %.100s matched 'Address " + "%.100s' at line %d", address, arg, line); + break; + case 0: + case -1: + result = 0; + break; + case -2: + return -1; + } + } else { + error("Unsupported Match attribute %s", attrib); + return -1; + } } - linenum = 0; - while (fgets(line, sizeof(line), f)) { - linenum++; - cp = line; + 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; + int 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); - /* Ignore leading whitespace */ - if (*arg == '\0') - arg = strdelim(&cp); - if (!arg || !*arg || *arg == '#') - continue; - intptr = NULL; - charptr = NULL; - opcode = parse_token(arg, filename, linenum); - switch (opcode) { - case sBadOption: - bad_options++; - continue; + 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; + } + } - /* Portable-specific options */ - case sPAMAuthenticationViaKbdInt: - intptr = &options->pam_authentication_via_kbd_int; - goto parse_flag; + switch (opcode) { + /* Portable-specific options */ + case sUsePAM: + intptr = &options->use_pam; + goto parse_flag; - /* Standard Options */ - case sPort: - /* ignore ports from configfile if cmdline specifies ports */ - if (options->ports_from_cmdline) - continue; - if (options->listen_addrs != NULL) - fatal("%s line %d: ports must be specified before " - "ListenAdress.", 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 sPermitPAMUserChange: + intptr = &options->permit_pam_user_change; + goto parse_flag; - case sServerKeyBits: - intptr = &options->server_key_bits; -parse_int: - arg = strdelim(&cp); - if (!arg || *arg == '\0') - fatal("%s line %d: missing integer value.", - filename, linenum); - value = atoi(arg); - if (*intptr == -1) - *intptr = value; + /* 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); - 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; + add_listen_addr(options, p, port); - case sKeyRegenerationTime: - intptr = &options->key_regeneration_time; - goto parse_time; + break; - case sListenAddress: - arg = strdelim(&cp); - if (!arg || *arg == '\0' || strncmp(arg, "[]", 2) == 0) - fatal("%s line %d: missing inet addr.", + 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 sNoneEnabled: + intptr = &options->none_enabled; + goto parse_flag; + + case sTcpRcvBufPoll: + intptr = &options->tcp_rcv_buf_poll; + goto parse_flag; + + case sHPNDisabled: + intptr = &options->hpn_disabled; + goto parse_flag; + + case sHPNBufferSize: + intptr = &options->hpn_buffer_size; + goto parse_int; + + 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 sGssDelegateCreds: + intptr = &options->gss_deleg_creds; + goto parse_flag; + + case sGssKeyEx: + intptr = &options->gss_keyex; + goto parse_flag; + + case sGssCleanupCreds: + intptr = &options->gss_cleanup_creds; + goto parse_flag; + + case sGssCredsPath: + charptr = &options->gss_creds_path; + goto parse_filename; + + case sGssStrictAcceptor: + intptr = &options->gss_strict_acceptor; + goto parse_flag; + + case sGssStoreRekey: + intptr = &options->gss_store_rekey; + goto parse_flag; + +#ifdef GSI + case sGsiAllowLimitedProxy: + intptr = &options->gsi_allow_limited_proxy; + goto parse_flag; +#endif + +#ifdef SESSION_HOOKS + case sAllowSessionHooks: + intptr = &options->session_hooks_allow; + goto parse_flag; + case sSessionHookStartupCmd: + case sSessionHookShutdownCmd: + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: empty session hook command", + filename, linenum); + if (opcode==sSessionHookStartupCmd) + options->session_hooks_startup_cmd = strdup(arg); + else + options->session_hooks_shutdown_cmd = strdup(arg); + break; +#endif + + case sPasswordAuthentication: + intptr = &options->password_authentication; + goto parse_flag; + + case sZeroKnowledgePasswordAuthentication: + intptr = &options->zero_knowledge_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 : ""); + 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 : ""); + 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); - if (*arg == '[') { - if ((p = strchr(arg, ']')) == NULL) - fatal("%s line %d: bad ipv6 inet addr usage.", - filename, linenum); - arg++; - memmove(p, p+1, strlen(p+1)+1); - } else if (((p = strchr(arg, ':')) == NULL) || - (strchr(p+1, ':') != NULL)) { - add_listen_addr(options, arg, 0); - break; - } - if (*p == ':') { - u_short port; - - p++; - if (*p == '\0') - fatal("%s line %d: bad inet addr:port usage.", - filename, linenum); - else { - *(p-1) = '\0'; - if ((port = a2port(p)) == 0) - fatal("%s line %d: bad port number.", - filename, linenum); - add_listen_addr(options, arg, port); - } - } else if (*p == '\0') - add_listen_addr(options, arg, 0); - else - fatal("%s line %d: bad inet addr usage.", + 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); - break; + options->deny_users[options->num_deny_users++] = + xstrdup(arg); + } + 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.", + 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 (*charptr == NULL) { - *charptr = tilde_expand_filename(arg, getuid()); - /* increase optional counter */ - if (intptr != NULL) - *intptr = *intptr + 1; - } - break; + options->allow_groups[options->num_allow_groups++] = + xstrdup(arg); + } + break; - case sPidFile: - charptr = &options->pid_file; - goto parse_filename; + 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 sPermitRootLogin: - intptr = &options->permit_root_login; + 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 : ""); + 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 : ""); + 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 : ""); + 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); - if (!arg || *arg == '\0') - fatal("%s line %d: missing yes/" - "without-password/forced-commands-only/no " - "argument.", filename, linenum); - value = 0; /* silence compiler */ - if (strcmp(arg, "without-password") == 0) - value = PERMIT_NO_PASSWD; - else if (strcmp(arg, "forced-commands-only") == 0) - value = PERMIT_FORCED_ONLY; - else if (strcmp(arg, "yes") == 0) - value = PERMIT_YES; - else if (strcmp(arg, "no") == 0) - value = PERMIT_NO; - else - fatal("%s line %d: Bad yes/" - "without-password/forced-commands-only/no " - "argument: %s", filename, linenum, arg); - if (*intptr == -1) - *intptr = value; break; + } + 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 sIgnoreRhosts: - intptr = &options->ignore_rhosts; -parse_flag: - arg = strdelim(&cp); - if (!arg || *arg == '\0') - fatal("%s line %d: missing yes/no argument.", + 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); - value = 0; /* silence compiler */ - if (strcmp(arg, "yes") == 0) - value = 1; - else if (strcmp(arg, "no") == 0) - value = 0; - else - fatal("%s line %d: Bad yes/no argument: %s", - filename, linenum, arg); - if (*intptr == -1) - *intptr = value; - break; - - case sIgnoreUserKnownHosts: - intptr = &options->ignore_user_known_hosts; - goto parse_flag; - - case sRhostsAuthentication: - intptr = &options->rhosts_authentication; - goto parse_flag; - - case sRhostsRSAAuthentication: - intptr = &options->rhosts_rsa_authentication; - goto parse_flag; - - case sHostbasedAuthentication: - intptr = &options->hostbased_authentication; - goto parse_flag; + } 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 sHostbasedUsesNameFromPacketOnly: - intptr = &options->hostbased_uses_name_from_packet_only; - goto parse_flag; + 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, 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 sRSAAuthentication: - intptr = &options->rsa_authentication; - goto parse_flag; + 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 sPubkeyAuthentication: - intptr = &options->pubkey_authentication; - goto parse_flag; -#ifdef GSSAPI - case sGssAuthentication: - intptr = &options->gss_authentication; - goto parse_flag; - case sGssKeyEx: - intptr = &options->gss_keyex; - goto parse_flag; - case sGssUseSessionCredCache: - intptr = &options->gss_use_session_ccache; - goto parse_flag; - case sGssCleanupCreds: - intptr = &options->gss_cleanup_creds; - goto parse_flag; -#endif -#if defined(KRB4) || defined(KRB5) - case sKerberosAuthentication: - intptr = &options->kerberos_authentication; - goto parse_flag; - - case sKerberosOrLocalPasswd: - intptr = &options->kerberos_or_local_passwd; - goto parse_flag; - - case sKerberosTicketCleanup: - intptr = &options->kerberos_ticket_cleanup; - goto parse_flag; -#endif -#if defined(AFS) || defined(KRB5) - case sKerberosTgtPassing: - intptr = &options->kerberos_tgt_passing; - goto parse_flag; -#endif -#ifdef AFS - case sAFSTokenPassing: - intptr = &options->afs_token_passing; - goto parse_flag; -#endif + case sChrootDirectory: + charptr = &options->chroot_directory; - case sPasswordAuthentication: - intptr = &options->password_authentication; - goto parse_flag; + 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 sKbdInteractiveAuthentication: - intptr = &options->kbd_interactive_authentication; - goto parse_flag; + case sDisUsageStats: + charptr = &options->chroot_directory; - case sChallengeResponseAuthentication: - intptr = &options->challenge_response_authentication; - goto parse_flag; + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: missing value.", + filename, linenum); + if (!strcasecmp(arg, "true") || + !strcasecmp(arg, "enabled") || + !strcasecmp(arg, "yes") || + !strcasecmp(arg, "on") || + !strcasecmp(arg, "1")) + options->disable_usage_stats = 1; + else if (!strcasecmp(arg, "false") || + !strcasecmp(arg, "disabled") || + !strcasecmp(arg, "no") || + !strcasecmp(arg, "off") || + !strcasecmp(arg, "0")) + options->disable_usage_stats = 0; + else + fatal("Incorrect value for disable_usage_stats"); + break; - case sPrintMotd: - intptr = &options->print_motd; - goto parse_flag; + case sUsageStatsTarg: + charptr = &options->chroot_directory; - case sPrintLastLog: - intptr = &options->print_lastlog; - goto parse_flag; + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: missing value.", + filename, linenum); + options->usage_stats_targets = 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; +} - case sX11Forwarding: - intptr = &options->x11_forwarding; - goto parse_flag; +/* Reads the server configuration file. */ - case sX11DisplayOffset: - intptr = &options->x11_display_offset; - goto parse_int; +void +load_server_config(const char *filename, Buffer *conf) +{ + char line[1024], *cp; + FILE *f; - case sXAuthLocation: - charptr = &options->xauth_location; - goto parse_filename; + 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"); - case sStrictModes: - intptr = &options->strict_modes; - goto parse_flag; + buffer_append(conf, cp, strlen(cp)); + } + buffer_append(conf, "\0", 1); + fclose(f); + debug2("%s: done config len = %d", __func__, buffer_len(conf)); +} - case sKeepAlives: - intptr = &options->keepalives; - goto parse_flag; +void +parse_server_match_config(ServerOptions *options, const char *user, + const char *host, const char *address) +{ + ServerOptions mo; - case sEmptyPasswd: - intptr = &options->permit_empty_passwd; - goto parse_flag; + initialize_server_options(&mo); + parse_server_config(&mo, "reprocess config", &cfg, user, host, address); + copy_set_server_options(options, &mo, 0); +} - case sUseLogin: - intptr = &options->use_login; - goto parse_flag; +/* 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) - case sGatewayPorts: - intptr = &options->gateway_ports; - goto parse_flag; +/* + * 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) +{ + M_CP_INTOPT(password_authentication); + M_CP_INTOPT(gss_authentication); + M_CP_INTOPT(gss_deleg_creds); + 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(zero_knowledge_password_authentication); + M_CP_INTOPT(permit_root_login); + M_CP_INTOPT(permit_empty_passwd); + + 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_INTOPT(max_authtries); + + M_CP_STROPT(banner); + if (preauth) + return; + M_CP_STROPT(adm_forced_command); + M_CP_STROPT(chroot_directory); +} - case sReverseMappingCheck: - intptr = &options->reverse_mapping_check; - goto parse_flag; +#undef M_CP_INTOPT +#undef M_CP_STROPT - case sLogFacility: - intptr = (int *) &options->log_facility; - arg = strdelim(&cp); - value = log_facility_number(arg); - if (value == (SyslogFacility) - 1) - fatal("%.200s line %d: unsupported log facility '%s'", - filename, linenum, arg ? arg : ""); - if (*intptr == -1) - *intptr = (SyslogFacility) value; - break; +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; - case sLogLevel: - intptr = (int *) &options->log_level; - arg = strdelim(&cp); - value = log_level_number(arg); - if (value == (LogLevel) - 1) - fatal("%.200s line %d: unsupported log level '%s'", - filename, linenum, arg ? arg : ""); - if (*intptr == -1) - *intptr = (LogLevel) value; - break; + debug2("%s: config %s len %d", __func__, filename, buffer_len(conf)); - case sAllowTcpForwarding: - intptr = &options->allow_tcp_forwarding; - goto parse_flag; + 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); +} - 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; +static const char * +fmt_intarg(ServerOpCodes code, int val) +{ + if (code == sAddressFamily) { + switch (val) { + case AF_INET: + return "inet"; + case AF_INET6: + return "inet6"; + case AF_UNSPEC: + return "any"; + default: + return "UNKNOWN"; + } + } + if (code == sPermitRootLogin) { + switch (val) { + case PERMIT_NO_PASSWD: + return "without-password"; + case PERMIT_FORCED_ONLY: + return "forced-commands-only"; + case PERMIT_YES: + return "yes"; + } + } + if (code == 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"; + } + } + if (code == sGatewayPorts && val == 2) + return "clientspecified"; + if (code == sCompression && val == COMP_DELAYED) + return "delayed"; + switch (val) { + case -1: + return "unset"; + case 0: + return "no"; + case 1: + return "yes"; + } + return "UNKNOWN"; +} - 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; +static const char * +lookup_opcode_name(ServerOpCodes code) +{ + u_int i; - 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; + for (i = 0; keywords[i].name != NULL; i++) + if (keywords[i].opcode == code) + return(keywords[i].name); + return "UNKNOWN"; +} - 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; +static void +dump_cfg_int(ServerOpCodes code, int val) +{ + printf("%s %d\n", lookup_opcode_name(code), val); +} - 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 : ""); - if (options->ciphers == NULL) - options->ciphers = xstrdup(arg); - break; +static void +dump_cfg_fmtint(ServerOpCodes code, int val) +{ + printf("%s %s\n", lookup_opcode_name(code), fmt_intarg(code, val)); +} - 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 : ""); - if (options->macs == NULL) - options->macs = xstrdup(arg); - break; +static void +dump_cfg_string(ServerOpCodes code, const char *val) +{ + if (val == NULL) + return; + printf("%s %s\n", lookup_opcode_name(code), val); +} - 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 : ""); - if (*intptr == SSH_PROTO_UNKNOWN) - *intptr = value; - break; +static void +dump_cfg_strarray(ServerOpCodes code, u_int count, char **vals) +{ + u_int i; - case sSubsystem: - if(options->num_subsystems >= MAX_SUBSYSTEMS) { - fatal("%s line %d: too many subsystems defined.", - filename, linenum); - } - arg = strdelim(&cp); - if (!arg || *arg == '\0') - fatal("%s line %d: Missing subsystem name.", - filename, linenum); - for (i = 0; i < options->num_subsystems; i++) - if(strcmp(arg, options->subsystem_name[i]) == 0) - fatal("%s line %d: Subsystem '%s' already defined.", - filename, linenum, arg); - options->subsystem_name[options->num_subsystems] = xstrdup(arg); - arg = strdelim(&cp); - if (!arg || *arg == '\0') - fatal("%s line %d: Missing subsystem command.", - filename, linenum); - options->subsystem_command[options->num_subsystems] = xstrdup(arg); - options->num_subsystems++; - break; + for (i = 0; i < count; i++) + printf("%s %s\n", lookup_opcode_name(code), vals[i]); +} - 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); +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 - options->max_startups = options->max_startups_begin; - break; + printf("listenaddress %s:%s\n", addr, port); + } + } - case sBanner: - charptr = &options->banner; - goto parse_filename; - /* - * These options can contain %X options expanded at - * connect time, so that you can specify paths like: - * - * AuthorizedKeysFile /etc/ssh_keys/%u - */ - case sAuthorizedKeysFile: - case sAuthorizedKeysFile2: - charptr = (opcode == sAuthorizedKeysFile ) ? - &options->authorized_keys_file : - &options->authorized_keys_file2; - goto parse_filename; - - case sClientAliveInterval: - intptr = &options->client_alive_interval; - goto parse_time; - - case sClientAliveCountMax: - intptr = &options->client_alive_count_max; - goto parse_int; - - case sDeprecated: - log("%s line %d: Deprecated option %s", - filename, linenum, arg); - while(arg) - arg = strdelim(&cp); + /* 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 +#ifdef JPAKE + dump_cfg_fmtint(sZeroKnowledgePasswordAuthentication, + o->zero_knowledge_password_authentication); +#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(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->gateway_ports); + dump_cfg_fmtint(sUseDNS, o->use_dns); + dump_cfg_fmtint(sAllowTcpForwarding, o->allow_tcp_forwarding); + dump_cfg_fmtint(sUsePrivilegeSeparation, use_privsep); + + /* string arguments */ + dump_cfg_string(sPidFile, o->pid_file); + dump_cfg_string(sXAuthLocation, o->xauth_location); + dump_cfg_string(sCiphers, o->ciphers); + dump_cfg_string(sMacs, o->macs); + dump_cfg_string(sBanner, o->banner); + dump_cfg_string(sAuthorizedKeysFile, o->authorized_keys_file); + dump_cfg_string(sAuthorizedKeysFile2, o->authorized_keys_file2); + dump_cfg_string(sForceCommand, o->adm_forced_command); + + /* 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(sHostKeyFile, o->num_host_key_files, + o->host_key_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); + + /* 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; - - 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); - } - fclose(f); - if (bad_options > 0) - fatal("%s: terminating, %d bad configuration options", - filename, bad_options); + dump_cfg_string(sPermitTunnel, s); + + channel_print_adm_permitted_opens(); }