568 lines
14 KiB
C
568 lines
14 KiB
C
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/*
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servconf.c
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Author: Tatu Ylonen <ylo@cs.hut.fi>
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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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Created: Mon Aug 21 15:48:58 1995 ylo
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*/
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#include "includes.h"
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RCSID("$Id: servconf.c,v 1.1 1999/10/27 03:42:45 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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/* Initializes the server options to their default values. */
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void initialize_server_options(ServerOptions *options)
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{
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memset(options, 0, sizeof(*options));
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options->port = -1;
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options->listen_addr.s_addr = htonl(INADDR_ANY);
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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->quiet_mode = -1;
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options->fascist_logging = -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->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 fill_default_server_options(ServerOptions *options)
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{
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if (options->port == -1)
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{
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struct servent *sp;
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sp = getservbyname(SSH_SERVICE_NAME, "tcp");
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if (sp)
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options->port = ntohs(sp->s_port);
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else
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options->port = SSH_DEFAULT_PORT;
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endservent();
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}
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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 = 0;
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if (options->quiet_mode == -1)
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options->quiet_mode = 0;
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if (options->check_mail == -1)
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options->check_mail = 0;
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if (options->fascist_logging == -1)
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options->fascist_logging = 1;
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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 = 1;
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if (options->x11_display_offset == -1)
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options->x11_display_offset = 1;
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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->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 = 1;
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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 = 1;
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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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{
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sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime,
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sPermitRootLogin, sQuietMode, sFascistLogging, sLogFacility,
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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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} ServerOpCodes;
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/* Textual representation of the tokens. */
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static struct
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{
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const char *name;
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ServerOpCodes opcode;
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} keywords[] =
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{
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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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{ "quietmode", sQuietMode },
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{ "fascistlogging", sFascistLogging },
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{ "syslogfacility", sLogFacility },
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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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{ "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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static struct
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{
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const char *name;
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SyslogFacility facility;
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} log_facilities[] =
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{
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{ "DAEMON", SYSLOG_FACILITY_DAEMON },
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{ "USER", SYSLOG_FACILITY_USER },
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{ "AUTH", SYSLOG_FACILITY_AUTH },
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{ "LOCAL0", SYSLOG_FACILITY_LOCAL0 },
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{ "LOCAL1", SYSLOG_FACILITY_LOCAL1 },
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{ "LOCAL2", SYSLOG_FACILITY_LOCAL2 },
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{ "LOCAL3", SYSLOG_FACILITY_LOCAL3 },
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{ "LOCAL4", SYSLOG_FACILITY_LOCAL4 },
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{ "LOCAL5", SYSLOG_FACILITY_LOCAL5 },
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{ "LOCAL6", SYSLOG_FACILITY_LOCAL6 },
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{ "LOCAL7", SYSLOG_FACILITY_LOCAL7 },
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{ NULL, 0 }
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};
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/* Returns the number of the token pointed to by cp of length len.
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Never returns if the token is not known. */
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static ServerOpCodes 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 (strcmp(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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exit(1);
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}
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/* Reads the server configuration file. */
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void 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, i, value;
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ServerOpCodes opcode;
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f = fopen(filename, "r");
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if (!f)
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{
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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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{
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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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{
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char *t = cp;
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for (; *t != 0; t++)
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if ('A' <= *t && *t <= 'Z')
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*t = *t - 'A' + 'a'; /* tolower */
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}
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opcode = parse_token(cp, filename, linenum);
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switch (opcode)
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{
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case sPort:
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intptr = &options->port;
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parse_int:
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cp = strtok(NULL, WHITESPACE);
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if (!cp)
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{
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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 sServerKeyBits:
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intptr = &options->server_key_bits;
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goto parse_int;
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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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{
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fprintf(stderr, "%s line %d: missing inet addr.\n",
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filename, linenum);
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exit(1);
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}
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options->listen_addr.s_addr = inet_addr(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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{
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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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{
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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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{
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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)
|
||
|
|
*intptr = value;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case sIgnoreRhosts:
|
||
|
|
intptr = &options->ignore_rhosts;
|
||
|
|
parse_flag:
|
||
|
|
cp = strtok(NULL, WHITESPACE);
|
||
|
|
if (!cp)
|
||
|
|
{
|
||
|
|
fprintf(stderr, "%s line %d: missing yes/no argument.\n",
|
||
|
|
filename, linenum);
|
||
|
|
exit(1);
|
||
|
|
}
|
||
|
|
if (strcmp(cp, "yes") == 0)
|
||
|
|
value = 1;
|
||
|
|
else
|
||
|
|
if (strcmp(cp, "no") == 0)
|
||
|
|
value = 0;
|
||
|
|
else
|
||
|
|
{
|
||
|
|
fprintf(stderr, "%s line %d: Bad yes/no argument: %s\n",
|
||
|
|
filename, linenum, cp);
|
||
|
|
exit(1);
|
||
|
|
}
|
||
|
|
if (*intptr == -1)
|
||
|
|
*intptr = value;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case sQuietMode:
|
||
|
|
intptr = &options->quiet_mode;
|
||
|
|
goto parse_flag;
|
||
|
|
|
||
|
|
case sFascistLogging:
|
||
|
|
intptr = &options->fascist_logging;
|
||
|
|
goto parse_flag;
|
||
|
|
|
||
|
|
case sRhostsAuthentication:
|
||
|
|
intptr = &options->rhosts_authentication;
|
||
|
|
goto parse_flag;
|
||
|
|
|
||
|
|
case sRhostsRSAAuthentication:
|
||
|
|
intptr = &options->rhosts_rsa_authentication;
|
||
|
|
goto parse_flag;
|
||
|
|
|
||
|
|
case sRSAAuthentication:
|
||
|
|
intptr = &options->rsa_authentication;
|
||
|
|
goto parse_flag;
|
||
|
|
|
||
|
|
#ifdef KRB4
|
||
|
|
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:
|
||
|
|
cp = strtok(NULL, WHITESPACE);
|
||
|
|
if (!cp)
|
||
|
|
{
|
||
|
|
fprintf(stderr, "%s line %d: missing facility name.\n",
|
||
|
|
filename, linenum);
|
||
|
|
exit(1);
|
||
|
|
}
|
||
|
|
for (i = 0; log_facilities[i].name; i++)
|
||
|
|
if (strcmp(log_facilities[i].name, cp) == 0)
|
||
|
|
break;
|
||
|
|
if (!log_facilities[i].name)
|
||
|
|
{
|
||
|
|
fprintf(stderr, "%s line %d: unsupported log facility %s\n",
|
||
|
|
filename, linenum, cp);
|
||
|
|
exit(1);
|
||
|
|
}
|
||
|
|
if (options->log_facility == (SyslogFacility)(-1))
|
||
|
|
options->log_facility = log_facilities[i].facility;
|
||
|
|
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);
|
||
|
|
}
|