+/* $OpenBSD: servconf.c,v 1.172 2007/04/23 10:15:39 dtucker Exp $ */
/*
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
* All rights reserved
*/
#include "includes.h"
-RCSID("$OpenBSD: servconf.c,v 1.91 2001/11/12 18:17:07 markus Exp $");
-#if defined(KRB4) || defined(KRB5)
-#include <krb.h>
-#endif
-#ifdef AFS
-#include <kafs.h>
-#endif
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netdb.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <signal.h>
+#include <unistd.h>
+#include <stdarg.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);
-/* 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. */
memset(options, 0, sizeof(*options));
/* Portable-specific options */
- options->pam_authentication_via_kbd_int = -1;
+ options->use_pam = -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;
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;
-#if defined(KRB4) || defined(KRB5)
options->kerberos_authentication = -1;
options->kerberos_or_local_passwd = -1;
options->kerberos_ticket_cleanup = -1;
-#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_cleanup_creds = -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->num_allow_users = 0;
options->num_deny_users = 0;
options->max_startups_begin = -1;
options->max_startups_rate = -1;
options->max_startups = -1;
+ options->max_authtries = -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;
}
void
fill_default_server_options(ServerOptions *options)
{
/* 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;
/* Standard Options */
if (options->protocol == SSH_PROTO_UNKNOWN)
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;
if (options->server_key_bits == -1)
options->server_key_bits = 768;
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)
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)
options->rsa_authentication = 1;
if (options->pubkey_authentication == -1)
options->pubkey_authentication = 1;
-#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 = 0;
+ if (options->gss_cleanup_creds == -1)
+ options->gss_cleanup_creds = 1;
if (options->password_authentication == -1)
options->password_authentication = 1;
if (options->kbd_interactive_authentication == -1)
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->gateway_ports == -1)
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->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) {
}
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;
+
+ /* 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,
/* Standard Options */
sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime,
sPermitRootLogin, sLogFacility, sLogLevel,
- sRhostsAuthentication, sRhostsRSAAuthentication, sRSAAuthentication,
-#if defined(KRB4) || defined(KRB5)
+ sRhostsRSAAuthentication, sRSAAuthentication,
sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup,
-#endif
-#if defined(AFS) || defined(KRB5)
- sKerberosTgtPassing,
-#endif
-#ifdef AFS
- sAFSTokenPassing,
-#endif
- sChallengeResponseAuthentication,
- sPasswordAuthentication, sKbdInteractiveAuthentication, sListenAddress,
+ sKerberosGetAFSToken,
+ sKerberosTgtPassing, sChallengeResponseAuthentication,
+ 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,
+ sBanner, sUseDNS, sHostbasedAuthentication,
+ sHostbasedUsesNameFromPacketOnly, sClientAliveInterval,
sClientAliveCountMax, sAuthorizedKeysFile, sAuthorizedKeysFile2,
- sDeprecated
+ sGssAuthentication, sGssCleanupCreds, sAcceptEnv, sPermitTunnel,
+ sMatch, sPermitOpen, sForceCommand,
+ sUsePrivilegeSeparation,
+ 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 },
+#else
+ { "usepam", 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 */
-#if defined(KRB4) || defined(KRB5)
- { "kerberosauthentication", sKerberosAuthentication },
- { "kerberosorlocalpasswd", sKerberosOrLocalPasswd },
- { "kerberosticketcleanup", sKerberosTicketCleanup },
+ { "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_GLOBAL },
+ { "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
-#if defined(AFS) || defined(KRB5)
- { "kerberostgtpassing", sKerberosTgtPassing },
+#else
+ { "kerberosauthentication", sUnsupported, SSHCFG_ALL },
+ { "kerberosorlocalpasswd", sUnsupported, SSHCFG_GLOBAL },
+ { "kerberosticketcleanup", sUnsupported, SSHCFG_GLOBAL },
+ { "kerberosgetafstoken", sUnsupported, SSHCFG_GLOBAL },
#endif
-#ifdef AFS
- { "afstokenpassing", sAFSTokenPassing },
+ { "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 },
- { "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 }
+ { "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_GLOBAL },
+ { "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 },
+ { "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_GLOBAL },
+ { "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 },
+ { NULL, sBadOption, 0 }
};
/*
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) {
+ *flags = keywords[i].flags;
return keywords[i].opcode;
+ }
error("%s: line %d: Bad configuration option: %s",
filename, linenum, cp);
static void
add_listen_addr(ServerOptions *options, char *addr, u_short 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]);
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);
+ snprintf(strport, sizeof strport, "%u", port);
if ((gaierr = getaddrinfo(addr, strport, &hints, &aitop)) != 0)
fatal("bad addr or host: %s (%s)",
addr ? addr : "<NULL>",
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;
+ u_int ngrps = 0;
+ char *arg, *p, *cp, *grplist[MAX_MATCH_GROUPS];
+ struct passwd *pw;
+
+ /*
+ * Even if we do not have a user yet, we still need to check for
+ * valid syntax.
+ */
+ arg = cp = xstrdup(grps);
+ while ((p = strsep(&cp, ",")) != NULL && *p != '\0') {
+ if (ngrps >= MAX_MATCH_GROUPS) {
+ error("line %d: too many groups in Match Group", line);
+ result = -1;
+ goto out;
+ }
+ grplist[ngrps++] = p;
+ }
- f = fopen(filename, "r");
- if (!f) {
- perror(filename);
- exit(1);
+ if (user == NULL)
+ goto out;
+
+ if ((pw = getpwnam(user)) == NULL) {
+ debug("Can't match group at line %d because user %.100s does "
+ "not exist", line, user);
+ } else if (ga_init(pw->pw_name, pw->pw_gid) == 0) {
+ debug("Can't Match group because user %.100s not in any group "
+ "at line %d", user, line);
+ } else if (ga_match(grplist, ngrps) != 1) {
+ debug("user %.100s does not match group %.100s at line %d",
+ user, arg, line);
+ } else {
+ debug("user %.100s matched group %.100s at line %d", user,
+ arg, line);
+ result = 1;
}
- linenum = 0;
- while (fgets(line, sizeof(line), f)) {
- linenum++;
- cp = line;
- 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;
+out:
+ ga_free();
+ xfree(arg);
+ return result;
+}
- /* Portable-specific options */
- case sPAMAuthenticationViaKbdInt:
- intptr = &options->pam_authentication_via_kbd_int;
- goto parse_flag;
+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;
- /* Standard Options */
- case sPort:
- /* ignore ports from configfile if cmdline specifies ports */
- if (options->ports_from_cmdline)
+ 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 (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 sServerKeyBits:
- intptr = &options->server_key_bits;
-parse_int:
- arg = strdelim(&cp);
- if (!arg || *arg == '\0')
- fatal("%s line %d: missing integer value.",
- filename, linenum);
- value = atoi(arg);
- if (*intptr == -1)
- *intptr = value;
- break;
-
- case sLoginGraceTime:
- intptr = &options->login_grace_time;
-parse_time:
- arg = strdelim(&cp);
- if (!arg || *arg == '\0')
- fatal("%s line %d: missing time value.",
- filename, linenum);
- if ((value = convtime(arg)) == -1)
- fatal("%s line %d: invalid time value.",
- filename, linenum);
- if (*intptr == -1)
- *intptr = value;
- break;
-
- case sKeyRegenerationTime:
- intptr = &options->key_regeneration_time;
- goto parse_time;
-
- case sListenAddress:
- arg = strdelim(&cp);
- if (!arg || *arg == '\0' || strncmp(arg, "[]", 2) == 0)
- fatal("%s line %d: missing inet addr.",
- filename, linenum);
- if (*arg == '[') {
- if ((p = strchr(arg, ']')) == NULL)
- fatal("%s line %d: bad ipv6 inet addr usage.",
- filename, linenum);
- arg++;
- memmove(p, p+1, strlen(p+1)+1);
- } else if (((p = strchr(arg, ':')) == NULL) ||
- (strchr(p+1, ':') != NULL)) {
- add_listen_addr(options, arg, 0);
- break;
}
- if (*p == ':') {
- u_short port;
-
- p++;
- if (*p == '\0')
- fatal("%s line %d: bad inet addr:port usage.",
- filename, linenum);
- else {
- *(p-1) = '\0';
- if ((port = a2port(p)) == 0)
- fatal("%s line %d: bad port number.",
- filename, linenum);
- add_listen_addr(options, arg, port);
- }
- } else if (*p == '\0')
- add_listen_addr(options, arg, 0);
+ if (match_pattern_list(user, arg, len, 0) != 1)
+ result = 0;
else
- fatal("%s line %d: bad inet addr usage.",
- filename, linenum);
- break;
-
- case sHostKeyFile:
- intptr = &options->num_host_key_files;
- if (*intptr >= MAX_HOSTKEYS)
- fatal("%s line %d: too many host keys specified (max %d).",
- filename, linenum, MAX_HOSTKEYS);
- charptr = &options->host_key_files[*intptr];
-parse_filename:
- arg = strdelim(&cp);
- if (!arg || *arg == '\0')
- fatal("%s line %d: missing file name.",
- filename, linenum);
- if (*charptr == NULL) {
- *charptr = tilde_expand_filename(arg, getuid());
- /* increase optional counter */
- if (intptr != NULL)
- *intptr = *intptr + 1;
+ 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;
}
- 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 if (strcasecmp(attrib, "host") == 0) {
+ if (!host) {
+ result = 0;
+ continue;
+ }
+ if (match_hostname(host, arg, len) != 1)
+ result = 0;
else
- fatal("%s line %d: Bad yes/"
- "without-password/forced-commands-only/no "
- "argument: %s", filename, linenum, arg);
- if (*intptr == -1)
- *intptr = value;
- break;
-
- case sIgnoreRhosts:
- intptr = &options->ignore_rhosts;
-parse_flag:
- arg = strdelim(&cp);
- if (!arg || *arg == '\0')
- fatal("%s line %d: missing yes/no argument.",
- filename, linenum);
- value = 0; /* silence compiler */
- if (strcmp(arg, "yes") == 0)
- value = 1;
- else if (strcmp(arg, "no") == 0)
- value = 0;
+ debug("connection from %.100s matched 'Host "
+ "%.100s' at line %d", host, arg, line);
+ } else if (strcasecmp(attrib, "address") == 0) {
+ if (!address) {
+ result = 0;
+ continue;
+ }
+ if (match_hostname(address, arg, len) != 1)
+ result = 0;
else
- fatal("%s line %d: Bad yes/no argument: %s",
- filename, linenum, arg);
- if (*intptr == -1)
- *intptr = value;
- break;
+ debug("connection from %.100s matched 'Address "
+ "%.100s' at line %d", address, arg, line);
+ } else {
+ error("Unsupported Match attribute %s", attrib);
+ return -1;
+ }
+ }
+ if (user != NULL)
+ debug3("match %sfound", result ? "" : "not ");
+ *condition = cp;
+ return result;
+}
- case sIgnoreUserKnownHosts:
- intptr = &options->ignore_user_known_hosts;
- goto parse_flag;
-
- case sRhostsAuthentication:
- intptr = &options->rhosts_authentication;
- goto parse_flag;
-
- case sRhostsRSAAuthentication:
- intptr = &options->rhosts_rsa_authentication;
- goto parse_flag;
-
- case sHostbasedAuthentication:
- intptr = &options->hostbased_authentication;
- goto parse_flag;
-
- case sHostbasedUsesNameFromPacketOnly:
- intptr = &options->hostbased_uses_name_from_packet_only;
- goto parse_flag;
-
- case sRSAAuthentication:
- intptr = &options->rsa_authentication;
- goto parse_flag;
-
- case sPubkeyAuthentication:
- intptr = &options->pubkey_authentication;
- goto parse_flag;
-#if defined(KRB4) || defined(KRB5)
- case sKerberosAuthentication:
- intptr = &options->kerberos_authentication;
- goto parse_flag;
-
- case sKerberosOrLocalPasswd:
- intptr = &options->kerberos_or_local_passwd;
- goto parse_flag;
-
- case sKerberosTicketCleanup:
- intptr = &options->kerberos_ticket_cleanup;
- goto parse_flag;
-#endif
-#if defined(AFS) || defined(KRB5)
- case sKerberosTgtPassing:
- intptr = &options->kerberos_tgt_passing;
- goto parse_flag;
-#endif
-#ifdef AFS
- case sAFSTokenPassing:
- intptr = &options->afs_token_passing;
- goto parse_flag;
-#endif
+#define WHITESPACE " \t\r\n"
- case sPasswordAuthentication:
- intptr = &options->password_authentication;
- goto parse_flag;
+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;
+ ServerOpCodes opcode;
+ u_short port;
+ u_int i, flags = 0;
+ size_t len;
+
+ cp = line;
+ if ((arg = strdelim(&cp)) == NULL)
+ return 0;
+ /* Ignore leading whitespace */
+ if (*arg == '\0')
+ arg = strdelim(&cp);
+ if (!arg || !*arg || *arg == '#')
+ return 0;
+ intptr = NULL;
+ charptr = NULL;
+ opcode = parse_token(arg, filename, linenum, &flags);
+
+ if (activep == NULL) { /* We are processing a command line directive */
+ cmdline = 1;
+ activep = &cmdline;
+ }
+ if (*activep && opcode != sMatch)
+ debug3("%s:%d setting %s %s", filename, linenum, arg, cp);
+ if (*activep == 0 && !(flags & SSHCFG_MATCH)) {
+ if (user == NULL) {
+ fatal("%s line %d: Directive '%s' is not allowed "
+ "within a Match block", filename, linenum, arg);
+ } else { /* this is a directive we have already processed */
+ while (arg)
+ arg = strdelim(&cp);
+ return 0;
+ }
+ }
+
+ switch (opcode) {
+ /* Portable-specific options */
+ case sUsePAM:
+ intptr = &options->use_pam;
+ goto parse_flag;
- case sKbdInteractiveAuthentication:
- intptr = &options->kbd_interactive_authentication;
- 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);
- case sChallengeResponseAuthentication:
- intptr = &options->challenge_response_authentication;
- goto parse_flag;
+ add_listen_addr(options, p, port);
- case sPrintMotd:
- intptr = &options->print_motd;
- goto parse_flag;
+ break;
- case sPrintLastLog:
- intptr = &options->print_lastlog;
- goto parse_flag;
+ 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 sX11Forwarding:
- intptr = &options->x11_forwarding;
- goto parse_flag;
+ case sPidFile:
+ charptr = &options->pid_file;
+ goto parse_filename;
- case sX11DisplayOffset:
- intptr = &options->x11_display_offset;
- goto parse_int;
+ case sPermitRootLogin:
+ intptr = &options->permit_root_login;
+ arg = strdelim(&cp);
+ if (!arg || *arg == '\0')
+ fatal("%s line %d: missing yes/"
+ "without-password/forced-commands-only/no "
+ "argument.", filename, linenum);
+ value = 0; /* silence compiler */
+ if (strcmp(arg, "without-password") == 0)
+ value = PERMIT_NO_PASSWD;
+ else if (strcmp(arg, "forced-commands-only") == 0)
+ value = PERMIT_FORCED_ONLY;
+ else if (strcmp(arg, "yes") == 0)
+ value = PERMIT_YES;
+ else if (strcmp(arg, "no") == 0)
+ value = PERMIT_NO;
+ else
+ fatal("%s line %d: Bad yes/"
+ "without-password/forced-commands-only/no "
+ "argument: %s", filename, linenum, arg);
+ if (*intptr == -1)
+ *intptr = value;
+ break;
+
+ case sIgnoreRhosts:
+ intptr = &options->ignore_rhosts;
+parse_flag:
+ arg = strdelim(&cp);
+ if (!arg || *arg == '\0')
+ fatal("%s line %d: missing yes/no argument.",
+ filename, linenum);
+ value = 0; /* silence compiler */
+ if (strcmp(arg, "yes") == 0)
+ value = 1;
+ else if (strcmp(arg, "no") == 0)
+ value = 0;
+ else
+ fatal("%s line %d: Bad yes/no argument: %s",
+ filename, linenum, arg);
+ if (*activep && *intptr == -1)
+ *intptr = value;
+ break;
- case sXAuthLocation:
- charptr = &options->xauth_location;
- goto parse_filename;
+ case sIgnoreUserKnownHosts:
+ intptr = &options->ignore_user_known_hosts;
+ goto parse_flag;
- case sStrictModes:
- intptr = &options->strict_modes;
- goto parse_flag;
+ case sRhostsRSAAuthentication:
+ intptr = &options->rhosts_rsa_authentication;
+ goto parse_flag;
+
+ case sHostbasedAuthentication:
+ intptr = &options->hostbased_authentication;
+ goto parse_flag;
+
+ case sHostbasedUsesNameFromPacketOnly:
+ intptr = &options->hostbased_uses_name_from_packet_only;
+ goto parse_flag;
+
+ case sRSAAuthentication:
+ intptr = &options->rsa_authentication;
+ goto parse_flag;
+
+ case sPubkeyAuthentication:
+ intptr = &options->pubkey_authentication;
+ goto parse_flag;
+
+ case sKerberosAuthentication:
+ intptr = &options->kerberos_authentication;
+ goto parse_flag;
+
+ case sKerberosOrLocalPasswd:
+ intptr = &options->kerberos_or_local_passwd;
+ goto parse_flag;
+
+ case sKerberosTicketCleanup:
+ intptr = &options->kerberos_ticket_cleanup;
+ goto parse_flag;
+
+ case sKerberosGetAFSToken:
+ intptr = &options->kerberos_get_afs_token;
+ goto parse_flag;
+
+ case sGssAuthentication:
+ intptr = &options->gss_authentication;
+ goto parse_flag;
+
+ case sGssCleanupCreds:
+ intptr = &options->gss_cleanup_creds;
+ goto parse_flag;
+
+ case sPasswordAuthentication:
+ intptr = &options->password_authentication;
+ goto parse_flag;
+
+ case sKbdInteractiveAuthentication:
+ intptr = &options->kbd_interactive_authentication;
+ goto parse_flag;
+
+ case sChallengeResponseAuthentication:
+ intptr = &options->challenge_response_authentication;
+ goto parse_flag;
+
+ case sPrintMotd:
+ intptr = &options->print_motd;
+ goto parse_flag;
+
+ case sPrintLastLog:
+ intptr = &options->print_lastlog;
+ goto parse_flag;
+
+ case sX11Forwarding:
+ intptr = &options->x11_forwarding;
+ goto parse_flag;
+
+ case sX11DisplayOffset:
+ intptr = &options->x11_display_offset;
+ goto parse_int;
+
+ case sX11UseLocalhost:
+ intptr = &options->x11_use_localhost;
+ goto parse_flag;
+
+ case sXAuthLocation:
+ charptr = &options->xauth_location;
+ goto parse_filename;
+
+ case sStrictModes:
+ intptr = &options->strict_modes;
+ goto parse_flag;
+
+ case sTCPKeepAlive:
+ intptr = &options->tcp_keep_alive;
+ goto parse_flag;
+
+ case sEmptyPasswd:
+ intptr = &options->permit_empty_passwd;
+ goto parse_flag;
- case sKeepAlives:
- intptr = &options->keepalives;
- goto parse_flag;
+ case sPermitUserEnvironment:
+ intptr = &options->permit_user_env;
+ goto parse_flag;
- case sEmptyPasswd:
- intptr = &options->permit_empty_passwd;
- goto parse_flag;
+ case sUseLogin:
+ intptr = &options->use_login;
+ 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:
+ intptr = (int *) &options->log_facility;
+ arg = strdelim(&cp);
+ value = log_facility_number(arg);
+ if (value == SYSLOG_FACILITY_NOT_SET)
+ fatal("%.200s line %d: unsupported log facility '%s'",
+ filename, linenum, arg ? arg : "<NONE>");
+ if (*intptr == -1)
+ *intptr = (SyslogFacility) value;
+ break;
+
+ case sLogLevel:
+ intptr = (int *) &options->log_level;
+ arg = strdelim(&cp);
+ value = log_level_number(arg);
+ if (value == SYSLOG_LEVEL_NOT_SET)
+ fatal("%.200s line %d: unsupported log level '%s'",
+ filename, linenum, arg ? arg : "<NONE>");
+ if (*intptr == -1)
+ *intptr = (LogLevel) value;
+ break;
+
+ case sAllowTcpForwarding:
+ intptr = &options->allow_tcp_forwarding;
+ goto parse_flag;
+
+ case sUsePrivilegeSeparation:
+ intptr = &use_privsep;
+ goto parse_flag;
+
+ case sAllowUsers:
+ while ((arg = strdelim(&cp)) && *arg != '\0') {
+ if (options->num_allow_users >= MAX_ALLOW_USERS)
+ fatal("%s line %d: too many allow users.",
+ filename, linenum);
+ options->allow_users[options->num_allow_users++] =
+ xstrdup(arg);
+ }
+ break;
- case sGatewayPorts:
- intptr = &options->gateway_ports;
- goto parse_flag;
+ case sDenyUsers:
+ while ((arg = strdelim(&cp)) && *arg != '\0') {
+ if (options->num_deny_users >= MAX_DENY_USERS)
+ fatal("%s line %d: too many deny users.",
+ filename, linenum);
+ options->deny_users[options->num_deny_users++] =
+ xstrdup(arg);
+ }
+ break;
- case sReverseMappingCheck:
- intptr = &options->reverse_mapping_check;
- goto parse_flag;
+ case sAllowGroups:
+ while ((arg = strdelim(&cp)) && *arg != '\0') {
+ if (options->num_allow_groups >= MAX_ALLOW_GROUPS)
+ fatal("%s line %d: too many allow groups.",
+ filename, linenum);
+ options->allow_groups[options->num_allow_groups++] =
+ xstrdup(arg);
+ }
+ break;
- case 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 : "<NONE>");
- if (*intptr == -1)
- *intptr = (SyslogFacility) value;
- break;
+ case sDenyGroups:
+ while ((arg = strdelim(&cp)) && *arg != '\0') {
+ if (options->num_deny_groups >= MAX_DENY_GROUPS)
+ fatal("%s line %d: too many deny groups.",
+ filename, linenum);
+ options->deny_groups[options->num_deny_groups++] = xstrdup(arg);
+ }
+ break;
- case sLogLevel:
- intptr = (int *) &options->log_level;
+ case sCiphers:
+ arg = strdelim(&cp);
+ if (!arg || *arg == '\0')
+ fatal("%s line %d: Missing argument.", filename, linenum);
+ if (!ciphers_valid(arg))
+ fatal("%s line %d: Bad SSH2 cipher spec '%s'.",
+ filename, linenum, arg ? arg : "<NONE>");
+ if (options->ciphers == NULL)
+ options->ciphers = xstrdup(arg);
+ break;
+
+ case sMacs:
+ arg = strdelim(&cp);
+ if (!arg || *arg == '\0')
+ fatal("%s line %d: Missing argument.", filename, linenum);
+ if (!mac_valid(arg))
+ fatal("%s line %d: Bad SSH2 mac spec '%s'.",
+ filename, linenum, arg ? arg : "<NONE>");
+ if (options->macs == NULL)
+ options->macs = xstrdup(arg);
+ break;
+
+ case sProtocol:
+ intptr = &options->protocol;
+ arg = strdelim(&cp);
+ if (!arg || *arg == '\0')
+ fatal("%s line %d: Missing argument.", filename, linenum);
+ value = proto_spec(arg);
+ if (value == SSH_PROTO_UNKNOWN)
+ fatal("%s line %d: Bad protocol spec '%s'.",
+ filename, linenum, arg ? arg : "<NONE>");
+ if (*intptr == SSH_PROTO_UNKNOWN)
+ *intptr = value;
+ break;
+
+ case sSubsystem:
+ if (options->num_subsystems >= MAX_SUBSYSTEMS) {
+ fatal("%s line %d: too many subsystems defined.",
+ filename, linenum);
+ }
+ arg = strdelim(&cp);
+ if (!arg || *arg == '\0')
+ fatal("%s line %d: Missing subsystem name.",
+ filename, linenum);
+ if (!*activep) {
arg = strdelim(&cp);
- value = log_level_number(arg);
- if (value == (LogLevel) - 1)
- fatal("%.200s line %d: unsupported log level '%s'",
- filename, linenum, arg ? arg : "<NONE>");
- if (*intptr == -1)
- *intptr = (LogLevel) 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 sAllowTcpForwarding:
- intptr = &options->allow_tcp_forwarding;
- goto parse_flag;
+ 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 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 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);
+ case sPermitTunnel:
+ intptr = &options->permit_tun;
+ arg = strdelim(&cp);
+ if (!arg || *arg == '\0')
+ fatal("%s line %d: Missing yes/point-to-point/"
+ "ethernet/no argument.", filename, linenum);
+ value = 0; /* silence compiler */
+ if (strcasecmp(arg, "ethernet") == 0)
+ value = SSH_TUNMODE_ETHERNET;
+ else if (strcasecmp(arg, "point-to-point") == 0)
+ value = SSH_TUNMODE_POINTOPOINT;
+ else if (strcasecmp(arg, "yes") == 0)
+ value = SSH_TUNMODE_YES;
+ else if (strcasecmp(arg, "no") == 0)
+ value = SSH_TUNMODE_NO;
+ else
+ fatal("%s line %d: Bad yes/point-to-point/ethernet/"
+ "no argument: %s", filename, linenum, arg);
+ if (*intptr == -1)
+ *intptr = value;
+ break;
+
+ case sMatch:
+ if (cmdline)
+ fatal("Match directive not supported as a command-line "
+ "option");
+ value = match_cfg_line(&cp, linenum, user, host, address);
+ if (value < 0)
+ fatal("%s line %d: Bad Match condition", filename,
+ linenum);
+ *activep = value;
+ break;
+
+ case sPermitOpen:
+ arg = strdelim(&cp);
+ if (!arg || *arg == '\0')
+ fatal("%s line %d: missing PermitOpen specification",
+ filename, linenum);
+ n = options->num_permitted_opens; /* modified later */
+ if (strcmp(arg, "any") == 0) {
+ if (*activep && n == -1) {
+ channel_clear_adm_permitted_opens();
+ options->num_permitted_opens = 0;
}
break;
+ }
+ if (*activep && n == -1)
+ channel_clear_adm_permitted_opens();
+ for (; arg != NULL && *arg != '\0'; arg = strdelim(&cp)) {
+ p = hpdelim(&arg);
+ if (p == NULL)
+ fatal("%s line %d: missing host in PermitOpen",
+ filename, linenum);
+ p = cleanhostname(p);
+ if (arg == NULL || (port = a2port(arg)) == 0)
+ fatal("%s line %d: bad port number in "
+ "PermitOpen", filename, linenum);
+ if (*activep && n == -1)
+ options->num_permitted_opens =
+ channel_add_adm_permitted_opens(p, port);
+ }
+ break;
+
+ case sForceCommand:
+ if (cp == NULL)
+ fatal("%.200s line %d: Missing argument.", filename,
+ linenum);
+ len = strspn(cp, WHITESPACE);
+ if (*activep && options->adm_forced_command == NULL)
+ options->adm_forced_command = xstrdup(cp + len);
+ return 0;
+
+ case 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 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;
+/* Reads the server configuration file. */
- 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;
+void
+load_server_config(const char *filename, Buffer *conf)
+{
+ char line[1024], *cp;
+ FILE *f;
- 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;
+ 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 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;
+ buffer_append(conf, cp, strlen(cp));
+ }
+ buffer_append(conf, "\0", 1);
+ fclose(f);
+ debug2("%s: done config len = %d", __func__, buffer_len(conf));
+}
- 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;
+void
+parse_server_match_config(ServerOptions *options, const char *user,
+ const char *host, const char *address)
+{
+ ServerOptions mo;
- 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;
+ initialize_server_options(&mo);
+ parse_server_config(&mo, "reprocess config", &cfg, user, host, address);
+ copy_set_server_options(options, &mo, 0);
+}
- 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;
+/* 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 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;
+/*
+ * Copy any supported values that are set.
+ *
+ * If the preauth flag is set, we do not bother copying the the string or
+ * array values that are not used pre-authentication, because any that we
+ * do use must be explictly sent in mm_getpwnamallow().
+ */
+void
+copy_set_server_options(ServerOptions *dst, ServerOptions *src, int preauth)
+{
+ M_CP_INTOPT(password_authentication);
+ M_CP_INTOPT(gss_authentication);
+ M_CP_INTOPT(rsa_authentication);
+ M_CP_INTOPT(pubkey_authentication);
+ M_CP_INTOPT(kerberos_authentication);
+ M_CP_INTOPT(hostbased_authentication);
+ M_CP_INTOPT(kbd_interactive_authentication);
+
+ M_CP_INTOPT(allow_tcp_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_STROPT(banner);
+ if (preauth)
+ return;
+ M_CP_STROPT(adm_forced_command);
+}
- case sBanner:
- charptr = &options->banner;
- goto parse_filename;
- /*
- * These options can contain %X options expanded at
- * connect time, so that you can specify paths like:
- *
- * AuthorizedKeysFile /etc/ssh_keys/%u
- */
- case sAuthorizedKeysFile:
- case sAuthorizedKeysFile2:
- charptr = (opcode == sAuthorizedKeysFile ) ?
- &options->authorized_keys_file :
- &options->authorized_keys_file2;
- goto parse_filename;
-
- case sClientAliveInterval:
- intptr = &options->client_alive_interval;
- goto parse_time;
-
- case sClientAliveCountMax:
- intptr = &options->client_alive_count_max;
- goto parse_int;
-
- case sDeprecated:
- log("%s line %d: Deprecated option %s",
- filename, linenum, arg);
- while(arg)
- arg = strdelim(&cp);
- break;
+#undef M_CP_INTOPT
+#undef M_CP_STROPT
- 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);
+void
+parse_server_config(ServerOptions *options, const char *filename, Buffer *conf,
+ const char *user, const char *host, const char *address)
+{
+ int active, linenum, bad_options = 0;
+ char *cp, *obuf, *cbuf;
+
+ debug2("%s: config %s len %d", __func__, filename, buffer_len(conf));
+
+ obuf = cbuf = xstrdup(buffer_ptr(conf));
+ active = user ? 0 : 1;
+ linenum = 1;
+ while ((cp = strsep(&cbuf, "\n")) != NULL) {
+ if (process_server_config_line(options, cp, filename,
+ linenum++, &active, user, host, address) != 0)
+ bad_options++;
}
- fclose(f);
+ xfree(obuf);
if (bad_options > 0)
fatal("%s: terminating, %d bad configuration options",
filename, bad_options);