mirror of
git://anongit.mindrot.org/openssh.git
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98c7ad60ec
[ssh.h atomicio.c] - int atomicio -> ssize_t (for alpha). ok deraadt@ [auth-rsa.c] - delay MD5 computation until client sends response, free() early, cleanup. [cipher.c] - void* -> unsigned char*, ok niels@ [hostfile.c] - remove unused variable 'len'. fix comments. - remove unused variable [log-client.c log-server.c] - rename a cpp symbol, to avoid param.h collision [packet.c] - missing xfree() - getsockname() requires initialized tolen; andy@guildsoftware.com - use getpeername() in packet_connection_is_on_socket(), fixes sshd -i; from Holger.Trapp@Informatik.TU-Chemnitz.DE [pty.c pty.h] - register cleanup for pty earlier. move code for pty-owner handling to pty.c ok provos@, dugsong@ [readconf.c] - turn off x11-fwd for the client, too. [rsa.c] - PKCS#1 padding [scp.c] - allow '.' in usernames; from jedgar@fxp.org [servconf.c] - typo: ignore_user_known_hosts int->flag; naddy@mips.rhein-neckar.de - sync with sshd_config [ssh-keygen.c] - enable ssh-keygen -l -f ~/.ssh/known_hosts, ok deraadt@ [ssh.1] - Change invalid 'CHAT' loglevel to 'VERBOSE' [ssh.c] - suppress AAAA query host when '-4' is used; from shin@nd.net.fujitsu.co.jp - turn off x11-fwd for the client, too. [sshconnect.c] - missing xfree() - retry rresvport_af(), too. from sumikawa@ebina.hitachi.co.jp. - read error vs. "Connection closed by remote host" [sshd.8] - ie. -> i.e., - do not link to a commercial page.. - sync with sshd_config [sshd.c] - no need for poll.h; from bright@wintelcom.net - log with level log() not fatal() if peer behaves badly. - don't panic if client behaves strange. ok deraadt@ - make no-port-forwarding for RSA keys deny both -L and -R style fwding - delay close() of pty until the pty has been chowned back to root - oops, fix comment, too. - missing xfree() - move XAUTHORITY to subdir. ok dugsong@. fixes debian bug #57907, too. (http://cgi.debian.org/cgi-bin/bugreport.cgi?archive=no&bug=57907) - register cleanup for pty earlier. move code for pty-owner handling to pty.c ok provos@, dugsong@ - create x11 cookie file - fix pr 1113, fclose() -> pclose(), todo: remote popen() - version 1.2.3 - Cleaned up
569 lines
15 KiB
C
569 lines
15 KiB
C
/*
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*
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* servconf.c
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*
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* Author: Tatu Ylonen <ylo@cs.hut.fi>
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*
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* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
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* All rights reserved
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*
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* Created: Mon Aug 21 15:48:58 1995 ylo
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*
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*/
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#include "includes.h"
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RCSID("$Id: servconf.c,v 1.9 2000/03/09 10:27:51 damien Exp $");
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#include "ssh.h"
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#include "servconf.h"
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#include "xmalloc.h"
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/* add listen address */
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void add_listen_addr(ServerOptions *options, char *addr);
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/* Initializes the server options to their default values. */
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void
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initialize_server_options(ServerOptions *options)
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{
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memset(options, 0, sizeof(*options));
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options->num_ports = 0;
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options->ports_from_cmdline = 0;
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options->listen_addrs = NULL;
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options->host_key_file = NULL;
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options->server_key_bits = -1;
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options->login_grace_time = -1;
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options->key_regeneration_time = -1;
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options->permit_root_login = -1;
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options->ignore_rhosts = -1;
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options->ignore_user_known_hosts = -1;
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options->print_motd = -1;
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options->check_mail = -1;
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options->x11_forwarding = -1;
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options->x11_display_offset = -1;
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options->strict_modes = -1;
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options->keepalives = -1;
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options->log_facility = (SyslogFacility) - 1;
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options->log_level = (LogLevel) - 1;
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options->rhosts_authentication = -1;
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options->rhosts_rsa_authentication = -1;
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options->rsa_authentication = -1;
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#ifdef KRB4
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options->kerberos_authentication = -1;
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options->kerberos_or_local_passwd = -1;
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options->kerberos_ticket_cleanup = -1;
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#endif
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#ifdef AFS
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options->kerberos_tgt_passing = -1;
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options->afs_token_passing = -1;
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#endif
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options->password_authentication = -1;
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#ifdef SKEY
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options->skey_authentication = -1;
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#endif
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options->permit_empty_passwd = -1;
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options->use_login = -1;
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options->num_allow_users = 0;
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options->num_deny_users = 0;
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options->num_allow_groups = 0;
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options->num_deny_groups = 0;
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}
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void
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fill_default_server_options(ServerOptions *options)
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{
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if (options->num_ports == 0)
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options->ports[options->num_ports++] = SSH_DEFAULT_PORT;
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if (options->listen_addrs == NULL)
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add_listen_addr(options, NULL);
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if (options->host_key_file == NULL)
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options->host_key_file = HOST_KEY_FILE;
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if (options->server_key_bits == -1)
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options->server_key_bits = 768;
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if (options->login_grace_time == -1)
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options->login_grace_time = 600;
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if (options->key_regeneration_time == -1)
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options->key_regeneration_time = 3600;
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if (options->permit_root_login == -1)
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options->permit_root_login = 1; /* yes */
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if (options->ignore_rhosts == -1)
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options->ignore_rhosts = 1;
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if (options->ignore_user_known_hosts == -1)
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options->ignore_user_known_hosts = 0;
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if (options->check_mail == -1)
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options->check_mail = 0;
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if (options->print_motd == -1)
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options->print_motd = 1;
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if (options->x11_forwarding == -1)
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options->x11_forwarding = 0;
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if (options->x11_display_offset == -1)
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options->x11_display_offset = 10;
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if (options->strict_modes == -1)
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options->strict_modes = 1;
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if (options->keepalives == -1)
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options->keepalives = 1;
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if (options->log_facility == (SyslogFacility) (-1))
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options->log_facility = SYSLOG_FACILITY_AUTH;
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if (options->log_level == (LogLevel) (-1))
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options->log_level = SYSLOG_LEVEL_INFO;
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if (options->rhosts_authentication == -1)
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options->rhosts_authentication = 0;
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if (options->rhosts_rsa_authentication == -1)
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options->rhosts_rsa_authentication = 0;
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if (options->rsa_authentication == -1)
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options->rsa_authentication = 1;
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#ifdef KRB4
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if (options->kerberos_authentication == -1)
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options->kerberos_authentication = (access(KEYFILE, R_OK) == 0);
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if (options->kerberos_or_local_passwd == -1)
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options->kerberos_or_local_passwd = 1;
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if (options->kerberos_ticket_cleanup == -1)
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options->kerberos_ticket_cleanup = 1;
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#endif /* KRB4 */
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#ifdef AFS
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if (options->kerberos_tgt_passing == -1)
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options->kerberos_tgt_passing = 0;
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if (options->afs_token_passing == -1)
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options->afs_token_passing = k_hasafs();
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#endif /* AFS */
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if (options->password_authentication == -1)
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options->password_authentication = 1;
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#ifdef SKEY
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if (options->skey_authentication == -1)
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options->skey_authentication = 1;
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#endif
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if (options->permit_empty_passwd == -1)
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options->permit_empty_passwd = 0;
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if (options->use_login == -1)
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options->use_login = 0;
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}
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#define WHITESPACE " \t\r\n"
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/* Keyword tokens. */
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typedef enum {
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sBadOption, /* == unknown option */
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sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime,
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sPermitRootLogin, sLogFacility, sLogLevel,
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sRhostsAuthentication, sRhostsRSAAuthentication, sRSAAuthentication,
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#ifdef KRB4
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sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup,
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#endif
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#ifdef AFS
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sKerberosTgtPassing, sAFSTokenPassing,
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#endif
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#ifdef SKEY
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sSkeyAuthentication,
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#endif
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sPasswordAuthentication, sListenAddress,
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sPrintMotd, sIgnoreRhosts, sX11Forwarding, sX11DisplayOffset,
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sStrictModes, sEmptyPasswd, sRandomSeedFile, sKeepAlives, sCheckMail,
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sUseLogin, sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups,
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sIgnoreUserKnownHosts
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} ServerOpCodes;
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/* Textual representation of the tokens. */
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static struct {
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const char *name;
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ServerOpCodes opcode;
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} keywords[] = {
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{ "port", sPort },
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{ "hostkey", sHostKeyFile },
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{ "serverkeybits", sServerKeyBits },
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{ "logingracetime", sLoginGraceTime },
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{ "keyregenerationinterval", sKeyRegenerationTime },
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{ "permitrootlogin", sPermitRootLogin },
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{ "syslogfacility", sLogFacility },
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{ "loglevel", sLogLevel },
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{ "rhostsauthentication", sRhostsAuthentication },
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{ "rhostsrsaauthentication", sRhostsRSAAuthentication },
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{ "rsaauthentication", sRSAAuthentication },
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#ifdef KRB4
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{ "kerberosauthentication", sKerberosAuthentication },
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{ "kerberosorlocalpasswd", sKerberosOrLocalPasswd },
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{ "kerberosticketcleanup", sKerberosTicketCleanup },
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#endif
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#ifdef AFS
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{ "kerberostgtpassing", sKerberosTgtPassing },
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{ "afstokenpassing", sAFSTokenPassing },
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#endif
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{ "passwordauthentication", sPasswordAuthentication },
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#ifdef SKEY
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{ "skeyauthentication", sSkeyAuthentication },
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#endif
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{ "checkmail", sCheckMail },
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{ "listenaddress", sListenAddress },
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{ "printmotd", sPrintMotd },
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{ "ignorerhosts", sIgnoreRhosts },
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{ "ignoreuserknownhosts", sIgnoreUserKnownHosts },
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{ "x11forwarding", sX11Forwarding },
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{ "x11displayoffset", sX11DisplayOffset },
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{ "strictmodes", sStrictModes },
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{ "permitemptypasswords", sEmptyPasswd },
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{ "uselogin", sUseLogin },
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{ "randomseed", sRandomSeedFile },
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{ "keepalive", sKeepAlives },
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{ "allowusers", sAllowUsers },
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{ "denyusers", sDenyUsers },
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{ "allowgroups", sAllowGroups },
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{ "denygroups", sDenyGroups },
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{ NULL, 0 }
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};
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/*
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* Returns the number of the token pointed to by cp of length len. Never
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* returns if the token is not known.
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*/
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static ServerOpCodes
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parse_token(const char *cp, const char *filename,
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int linenum)
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{
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unsigned int i;
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for (i = 0; keywords[i].name; i++)
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if (strcasecmp(cp, keywords[i].name) == 0)
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return keywords[i].opcode;
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fprintf(stderr, "%s: line %d: Bad configuration option: %s\n",
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filename, linenum, cp);
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return sBadOption;
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}
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/*
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* add listen address
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*/
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void
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add_listen_addr(ServerOptions *options, char *addr)
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{
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extern int IPv4or6;
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struct addrinfo hints, *ai, *aitop;
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char strport[NI_MAXSERV];
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int gaierr;
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int i;
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if (options->num_ports == 0)
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options->ports[options->num_ports++] = SSH_DEFAULT_PORT;
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for (i = 0; i < options->num_ports; i++) {
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memset(&hints, 0, sizeof(hints));
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hints.ai_family = IPv4or6;
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hints.ai_socktype = SOCK_STREAM;
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hints.ai_flags = (addr == NULL) ? AI_PASSIVE : 0;
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snprintf(strport, sizeof strport, "%d", options->ports[i]);
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if ((gaierr = getaddrinfo(addr, strport, &hints, &aitop)) != 0)
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fatal("bad addr or host: %s (%s)\n",
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addr ? addr : "<NULL>",
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gai_strerror(gaierr));
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for (ai = aitop; ai->ai_next; ai = ai->ai_next)
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;
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ai->ai_next = options->listen_addrs;
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options->listen_addrs = aitop;
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}
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}
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/* Reads the server configuration file. */
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void
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read_server_config(ServerOptions *options, const char *filename)
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{
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FILE *f;
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char line[1024];
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char *cp, **charptr;
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int linenum, *intptr, value;
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int bad_options = 0;
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ServerOpCodes opcode;
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f = fopen(filename, "r");
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if (!f) {
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perror(filename);
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exit(1);
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}
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linenum = 0;
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while (fgets(line, sizeof(line), f)) {
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linenum++;
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cp = line + strspn(line, WHITESPACE);
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if (!*cp || *cp == '#')
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continue;
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cp = strtok(cp, WHITESPACE);
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opcode = parse_token(cp, filename, linenum);
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switch (opcode) {
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case sBadOption:
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bad_options++;
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continue;
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case sPort:
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/* ignore ports from configfile if cmdline specifies ports */
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if (options->ports_from_cmdline)
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continue;
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if (options->listen_addrs != NULL)
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fatal("%s line %d: ports must be specified before "
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"ListenAdress.\n", filename, linenum);
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if (options->num_ports >= MAX_PORTS)
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fatal("%s line %d: too many ports.\n",
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filename, linenum);
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cp = strtok(NULL, WHITESPACE);
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if (!cp)
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fatal("%s line %d: missing port number.\n",
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filename, linenum);
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options->ports[options->num_ports++] = atoi(cp);
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break;
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case sServerKeyBits:
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intptr = &options->server_key_bits;
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parse_int:
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cp = strtok(NULL, WHITESPACE);
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if (!cp) {
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fprintf(stderr, "%s line %d: missing integer value.\n",
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filename, linenum);
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exit(1);
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}
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value = atoi(cp);
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if (*intptr == -1)
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*intptr = value;
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break;
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case sLoginGraceTime:
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intptr = &options->login_grace_time;
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goto parse_int;
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case sKeyRegenerationTime:
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intptr = &options->key_regeneration_time;
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goto parse_int;
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case sListenAddress:
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cp = strtok(NULL, WHITESPACE);
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if (!cp)
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fatal("%s line %d: missing inet addr.\n",
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filename, linenum);
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add_listen_addr(options, cp);
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break;
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case sHostKeyFile:
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charptr = &options->host_key_file;
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cp = strtok(NULL, WHITESPACE);
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if (!cp) {
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fprintf(stderr, "%s line %d: missing file name.\n",
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filename, linenum);
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exit(1);
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}
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if (*charptr == NULL)
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*charptr = tilde_expand_filename(cp, getuid());
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break;
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case sRandomSeedFile:
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fprintf(stderr, "%s line %d: \"randomseed\" option is obsolete.\n",
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filename, linenum);
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cp = strtok(NULL, WHITESPACE);
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break;
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case sPermitRootLogin:
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intptr = &options->permit_root_login;
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cp = strtok(NULL, WHITESPACE);
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if (!cp) {
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fprintf(stderr, "%s line %d: missing yes/without-password/no argument.\n",
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filename, linenum);
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exit(1);
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}
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if (strcmp(cp, "without-password") == 0)
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value = 2;
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else if (strcmp(cp, "yes") == 0)
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value = 1;
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else if (strcmp(cp, "no") == 0)
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value = 0;
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else {
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fprintf(stderr, "%s line %d: Bad yes/without-password/no argument: %s\n",
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filename, linenum, cp);
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exit(1);
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}
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if (*intptr == -1)
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*intptr = value;
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break;
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case sIgnoreRhosts:
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intptr = &options->ignore_rhosts;
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parse_flag:
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cp = strtok(NULL, WHITESPACE);
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if (!cp) {
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fprintf(stderr, "%s line %d: missing yes/no argument.\n",
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filename, linenum);
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exit(1);
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}
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if (strcmp(cp, "yes") == 0)
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value = 1;
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else if (strcmp(cp, "no") == 0)
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value = 0;
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else {
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fprintf(stderr, "%s line %d: Bad yes/no argument: %s\n",
|
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filename, linenum, cp);
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exit(1);
|
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}
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if (*intptr == -1)
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*intptr = value;
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break;
|
|
|
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case sIgnoreUserKnownHosts:
|
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intptr = &options->ignore_user_known_hosts;
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goto parse_flag;
|
|
|
|
case sRhostsAuthentication:
|
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intptr = &options->rhosts_authentication;
|
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goto parse_flag;
|
|
|
|
case sRhostsRSAAuthentication:
|
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intptr = &options->rhosts_rsa_authentication;
|
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goto parse_flag;
|
|
|
|
case sRSAAuthentication:
|
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intptr = &options->rsa_authentication;
|
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goto parse_flag;
|
|
|
|
#ifdef KRB4
|
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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
|
|
|
|
#ifdef AFS
|
|
case sKerberosTgtPassing:
|
|
intptr = &options->kerberos_tgt_passing;
|
|
goto parse_flag;
|
|
|
|
case sAFSTokenPassing:
|
|
intptr = &options->afs_token_passing;
|
|
goto parse_flag;
|
|
#endif
|
|
|
|
case sPasswordAuthentication:
|
|
intptr = &options->password_authentication;
|
|
goto parse_flag;
|
|
|
|
case sCheckMail:
|
|
intptr = &options->check_mail;
|
|
goto parse_flag;
|
|
|
|
#ifdef SKEY
|
|
case sSkeyAuthentication:
|
|
intptr = &options->skey_authentication;
|
|
goto parse_flag;
|
|
#endif
|
|
|
|
case sPrintMotd:
|
|
intptr = &options->print_motd;
|
|
goto parse_flag;
|
|
|
|
case sX11Forwarding:
|
|
intptr = &options->x11_forwarding;
|
|
goto parse_flag;
|
|
|
|
case sX11DisplayOffset:
|
|
intptr = &options->x11_display_offset;
|
|
goto parse_int;
|
|
|
|
case sStrictModes:
|
|
intptr = &options->strict_modes;
|
|
goto parse_flag;
|
|
|
|
case sKeepAlives:
|
|
intptr = &options->keepalives;
|
|
goto parse_flag;
|
|
|
|
case sEmptyPasswd:
|
|
intptr = &options->permit_empty_passwd;
|
|
goto parse_flag;
|
|
|
|
case sUseLogin:
|
|
intptr = &options->use_login;
|
|
goto parse_flag;
|
|
|
|
case sLogFacility:
|
|
intptr = (int *) &options->log_facility;
|
|
cp = strtok(NULL, WHITESPACE);
|
|
value = log_facility_number(cp);
|
|
if (value == (SyslogFacility) - 1)
|
|
fatal("%.200s line %d: unsupported log facility '%s'\n",
|
|
filename, linenum, cp ? cp : "<NONE>");
|
|
if (*intptr == -1)
|
|
*intptr = (SyslogFacility) value;
|
|
break;
|
|
|
|
case sLogLevel:
|
|
intptr = (int *) &options->log_level;
|
|
cp = strtok(NULL, WHITESPACE);
|
|
value = log_level_number(cp);
|
|
if (value == (LogLevel) - 1)
|
|
fatal("%.200s line %d: unsupported log level '%s'\n",
|
|
filename, linenum, cp ? cp : "<NONE>");
|
|
if (*intptr == -1)
|
|
*intptr = (LogLevel) value;
|
|
break;
|
|
|
|
case sAllowUsers:
|
|
while ((cp = strtok(NULL, WHITESPACE))) {
|
|
if (options->num_allow_users >= MAX_ALLOW_USERS) {
|
|
fprintf(stderr, "%s line %d: too many allow users.\n",
|
|
filename, linenum);
|
|
exit(1);
|
|
}
|
|
options->allow_users[options->num_allow_users++] = xstrdup(cp);
|
|
}
|
|
break;
|
|
|
|
case sDenyUsers:
|
|
while ((cp = strtok(NULL, WHITESPACE))) {
|
|
if (options->num_deny_users >= MAX_DENY_USERS) {
|
|
fprintf(stderr, "%s line %d: too many deny users.\n",
|
|
filename, linenum);
|
|
exit(1);
|
|
}
|
|
options->deny_users[options->num_deny_users++] = xstrdup(cp);
|
|
}
|
|
break;
|
|
|
|
case sAllowGroups:
|
|
while ((cp = strtok(NULL, WHITESPACE))) {
|
|
if (options->num_allow_groups >= MAX_ALLOW_GROUPS) {
|
|
fprintf(stderr, "%s line %d: too many allow groups.\n",
|
|
filename, linenum);
|
|
exit(1);
|
|
}
|
|
options->allow_groups[options->num_allow_groups++] = xstrdup(cp);
|
|
}
|
|
break;
|
|
|
|
case sDenyGroups:
|
|
while ((cp = strtok(NULL, WHITESPACE))) {
|
|
if (options->num_deny_groups >= MAX_DENY_GROUPS) {
|
|
fprintf(stderr, "%s line %d: too many deny groups.\n",
|
|
filename, linenum);
|
|
exit(1);
|
|
}
|
|
options->deny_groups[options->num_deny_groups++] = xstrdup(cp);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
fprintf(stderr, "%s line %d: Missing handler for opcode %s (%d)\n",
|
|
filename, linenum, cp, opcode);
|
|
exit(1);
|
|
}
|
|
if (strtok(NULL, WHITESPACE) != NULL) {
|
|
fprintf(stderr, "%s line %d: garbage at end of line.\n",
|
|
filename, linenum);
|
|
exit(1);
|
|
}
|
|
}
|
|
fclose(f);
|
|
if (bad_options > 0) {
|
|
fprintf(stderr, "%s: terminating, %d bad configuration options\n",
|
|
filename, bad_options);
|
|
exit(1);
|
|
}
|
|
}
|