/* servconf.c Author: Tatu Ylonen Copyright (c) 1995 Tatu Ylonen , Espoo, Finland All rights reserved Created: Mon Aug 21 15:48:58 1995 ylo */ /* * $Id: servconf.c,v 1.14 1998/05/23 20:34:11 kivinen Exp $ * $Log: servconf.c,v $ * Revision 1.14 1998/05/23 20:34:11 kivinen * Added forced_empty_passwd_change, num_deny_shosts, * num_allow_shosts, password_expire_warning_days, * account_expire_warning_days. Fixed typo in * forcedpasswordchange. * * Revision 1.13 1998/03/27 16:59:58 kivinen * Added IgnoreRootRhosts option. * * Revision 1.12 1998/01/03 06:41:55 kivinen * Added allow/deny groups option. * * Revision 1.11 1998/01/02 06:20:33 kivinen * Added xauthlocation and checkmail options. * * Revision 1.10 1997/04/27 21:51:34 kivinen * Added F-SECURE stuff. Added {Allow,Deny}Forwarding{To,Port} * feature. Added {Allow,Deny}Users feature from Steve Kann * . * * Revision 1.9 1997/04/21 01:03:59 kivinen * Fixed allow_tcp_forwarding option default to yes. * * Revision 1.8 1997/04/05 21:50:07 kivinen * Fixed bug in allow_tcp_forwarding code. * * Revision 1.7 1997/03/27 03:14:16 kivinen * Changed sAllow_Tcp_Forwarding to sAllowTcpForwarding and * sKerberos_Or_Local_Passwd to sKerberosOrLocalPasswd. * * Revision 1.6 1997/03/27 03:12:39 kivinen * Added kerberos patches from Glenn Machin. * Added USELOGIN patches from Brian Cully. * * Revision 1.5 1997/03/26 05:33:16 kivinen * Added idle_timeout option. * * Revision 1.4 1997/03/25 05:44:38 kivinen * Added SilentDeny and Umask options. * Added = to WHITESPACE to allow options in form foo=bar. * Changed keywords to be case insensitive. * * Revision 1.3 1997/03/19 17:55:04 kivinen * Added TIS authentication code from Andre April * . * Added SECURE_RPC, SECURE_NFS and NIS_PLUS support from Andy * Polyakov . * * Revision 1.2 1996/11/27 15:38:27 ttsalo * Added X11DisplayOffset-option * * Revision 1.1.1.1 1996/02/18 21:38:12 ylo * Imported ssh-1.2.13. * * $EndLog$ */ #include "includes.h" #include "ssh.h" #include "servconf.h" #include "xmalloc.h" /* Initializes the server options to their default values. */ void initialize_server_options(ServerOptions *options) { memset(options, 0, sizeof(*options)); options->port = -1; options->listen_addr.s_addr = INADDR_ANY; options->host_key_file = NULL; options->random_seed_file = NULL; options->pid_file = NULL; options->server_key_bits = -1; options->login_grace_time = -1; options->key_regeneration_time = -1; options->permit_root_login = -1; options->ignore_rhosts = -1; options->ignore_root_rhosts = -1; options->quiet_mode = -1; options->fascist_logging = -1; options->print_motd = -1; options->x11_forwarding = -1; options->x11_display_offset = -1; options->strict_modes = -1; options->keepalives = -1; options->log_facility = (SyslogFacility)-1; options->rhosts_authentication = -1; options->rhosts_rsa_authentication = -1; options->rsa_authentication = -1; options->kerberos_authentication = -1; options->kerberos_or_local_passwd = -1; options->kerberos_tgt_passing = -1; options->tis_authentication = -1; options->allow_tcp_forwarding = -1; options->password_authentication = -1; options->permit_empty_passwd = -1; options->use_login = -1; options->silent_deny = -1; options->forced_passwd_change = -1; options->forced_empty_passwd_change = -1; options->num_allow_shosts = 0; options->num_deny_shosts = 0; options->num_allow_hosts = 0; options->num_deny_hosts = 0; options->num_allow_users = 0; options->num_deny_users = 0; options->num_allow_groups = 0; options->num_deny_groups = 0; #ifdef F_SECURE_COMMERCIAL #endif /* F_SECURE_COMMERCIAL */ options->umask = -1; options->idle_timeout = -1; options->xauth_path = NULL; options->check_mail = -1; options->password_expire_warning_days = -1; options->account_expire_warning_days = -1; } void fill_default_server_options(ServerOptions *options) { if (options->port == -1) { struct servent *sp; sp = getservbyname(SSH_SERVICE_NAME, "tcp"); if (sp) options->port = ntohs(sp->s_port); else options->port = SSH_DEFAULT_PORT; endservent(); } if (options->host_key_file == NULL) options->host_key_file = HOST_KEY_FILE; if (options->random_seed_file == NULL) options->random_seed_file = SSH_DAEMON_SEED_FILE; if (options->pid_file == NULL) options->pid_file = SSH_DAEMON_PID_FILE; if (options->server_key_bits == -1) options->server_key_bits = 768; if (options->login_grace_time == -1) options->login_grace_time = 600; if (options->key_regeneration_time == -1) options->key_regeneration_time = 3600; if (options->permit_root_login == -1) options->permit_root_login = 2; if (options->ignore_rhosts == -1) options->ignore_rhosts = 0; if (options->ignore_root_rhosts == -1) options->ignore_root_rhosts = options->ignore_rhosts; if (options->quiet_mode == -1) options->quiet_mode = 0; if (options->fascist_logging == -1) options->fascist_logging = 1; if (options->print_motd == -1) options->print_motd = 1; if (options->x11_forwarding == -1) options->x11_forwarding = 1; if (options->x11_display_offset == -1) options->x11_display_offset = 1; if (options->strict_modes == -1) options->strict_modes = 1; if (options->keepalives == -1) options->keepalives = 1; if (options->log_facility == (SyslogFacility)(-1)) options->log_facility = SYSLOG_FACILITY_DAEMON; if (options->rhosts_authentication == -1) options->rhosts_authentication = 0; if (options->rhosts_rsa_authentication == -1) options->rhosts_rsa_authentication = 1; if (options->rsa_authentication == -1) options->rsa_authentication = 1; if (options->kerberos_authentication == -1) #if defined(KERBEROS) && defined(KRB5) options->kerberos_authentication = 1; #else /* defined(KERBEROS) && defined(KRB5) */ options->kerberos_authentication = 0; #endif /* defined(KERBEROS) && defined(KRB5) */ if (options->kerberos_or_local_passwd == -1) options->kerberos_or_local_passwd = 0; if (options->kerberos_tgt_passing == -1) #if defined(KERBEROS_TGT_PASSING) && defined(KRB5) options->kerberos_tgt_passing = 1; #else /* defined(KERBEROS_TGT_PASSING) && defined(KRB5) */ options->kerberos_tgt_passing = 0; #endif /* defined(KERBEROS_TGT_PASSING) && defined(KRB5) */ if (options->allow_tcp_forwarding == -1) options->allow_tcp_forwarding = 1; if (options->tis_authentication == -1) options->tis_authentication = 0; if (options->password_authentication == -1) options->password_authentication = 1; if (options->permit_empty_passwd == -1) options->permit_empty_passwd = 1; if (options->use_login == -1) options->use_login = 0; if (options->silent_deny == -1) options->silent_deny = 0; if (options->forced_passwd_change == -1) options->forced_passwd_change = 1; if (options->forced_empty_passwd_change == -1) options->forced_empty_passwd_change = 0; if (options->idle_timeout == -1) options->idle_timeout = 0; if (options->check_mail == -1) options->check_mail = 1; #ifdef XAUTH_PATH if (options->xauth_path == NULL) options->xauth_path = XAUTH_PATH; #else /* !XAUTH_PATH */ if (options->xauth_path == NULL) options->xauth_path = "xauth"; #endif /* !XAUTH_PATH */ if (options->password_expire_warning_days == -1) options->password_expire_warning_days = 14; if (options->account_expire_warning_days == -1) options->account_expire_warning_days = 14; } #define WHITESPACE " \t\r\n=" /* Keyword tokens. */ typedef enum { sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime, sPermitRootLogin, sQuietMode, sFascistLogging, sLogFacility, sRhostsAuthentication, sRhostsRSAAuthentication, sRSAAuthentication, sTISAuthentication, sPasswordAuthentication, sAllowHosts, sDenyHosts, sListenAddress, sPrintMotd, sIgnoreRhosts, sX11Forwarding, sX11DisplayOffset, sStrictModes, sEmptyPasswd, sRandomSeedFile, sKeepAlives, sPidFile, sForcedPasswd, sForcedEmptyPasswd, sUmask, sSilentDeny, sIdleTimeout, sUseLogin, sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTgtPassing, sAllowTcpForwarding, sAllowUsers, sDenyUsers, sXauthPath, sCheckMail, sDenyGroups, sAllowGroups, sIgnoreRootRhosts, sAllowSHosts, sDenySHosts, sPasswordExpireWarningDays, sAccountExpireWarningDays #ifdef F_SECURE_COMMERCIAL #endif /* F_SECURE_COMMERCIAL */ } ServerOpCodes; /* Textual representation of the tokens. */ static struct { const char *name; ServerOpCodes opcode; } keywords[] = { { "port", sPort }, { "hostkey", sHostKeyFile }, { "serverkeybits", sServerKeyBits }, { "logingracetime", sLoginGraceTime }, { "keyregenerationinterval", sKeyRegenerationTime }, { "permitrootlogin", sPermitRootLogin }, { "quietmode", sQuietMode }, { "fascistlogging", sFascistLogging }, { "syslogfacility", sLogFacility }, { "rhostsauthentication", sRhostsAuthentication }, { "rhostsrsaauthentication", sRhostsRSAAuthentication }, { "rsaauthentication", sRSAAuthentication }, { "tisauthentication", sTISAuthentication }, { "passwordauthentication", sPasswordAuthentication }, { "uselogin", sUseLogin }, { "allowshosts", sAllowSHosts }, { "denyshosts", sDenySHosts }, { "allowhosts", sAllowHosts }, { "denyhosts", sDenyHosts }, { "allowusers", sAllowUsers }, { "denyusers", sDenyUsers }, { "allowgroups", sAllowGroups }, { "denygroups", sDenyGroups }, #ifdef F_SECURE_COMMERCIAL #endif /* F_SECURE_COMMERCIAL */ { "listenaddress", sListenAddress }, { "printmotd", sPrintMotd }, { "ignorerhosts", sIgnoreRhosts }, { "ignorerootrhosts", sIgnoreRootRhosts }, { "x11forwarding", sX11Forwarding }, { "x11displayoffset", sX11DisplayOffset }, { "strictmodes", sStrictModes }, { "permitemptypasswords", sEmptyPasswd }, { "forcedpasswdchange", sForcedPasswd }, { "randomseed", sRandomSeedFile }, { "keepalive", sKeepAlives }, { "pidfile", sPidFile }, { "umask", sUmask }, { "silentdeny", sSilentDeny }, { "idletimeout", sIdleTimeout }, { "kerberosauthentication", sKerberosAuthentication }, { "kerberosorlocalpasswd", sKerberosOrLocalPasswd }, { "kerberostgtpassing", sKerberosTgtPassing }, { "allowtcpforwarding", sAllowTcpForwarding }, { "xauthlocation", sXauthPath }, { "checkmail", sCheckMail }, { "passwordexpirewarningdays", sPasswordExpireWarningDays }, { "accountexpirewarningdays", sAccountExpireWarningDays }, { NULL, 0 } }; static struct { const char *name; SyslogFacility facility; } log_facilities[] = { { "daemon", SYSLOG_FACILITY_DAEMON }, { "user", SYSLOG_FACILITY_USER }, { "auth", SYSLOG_FACILITY_AUTH }, { "local0", SYSLOG_FACILITY_LOCAL0 }, { "local1", SYSLOG_FACILITY_LOCAL1 }, { "local2", SYSLOG_FACILITY_LOCAL2 }, { "local3", SYSLOG_FACILITY_LOCAL3 }, { "local4", SYSLOG_FACILITY_LOCAL4 }, { "local5", SYSLOG_FACILITY_LOCAL5 }, { "local6", SYSLOG_FACILITY_LOCAL6 }, { "local7", SYSLOG_FACILITY_LOCAL7 }, { NULL, 0 } }; /* Returns the number of the token pointed to by cp of length len. Never returns if the token is not known. */ static ServerOpCodes parse_token(const char *cp, const char *filename, int linenum) { unsigned int i; for (i = 0; keywords[i].name; i++) if (strcmp(cp, keywords[i].name) == 0) return keywords[i].opcode; fprintf(stderr, "%s line %d: Bad configuration option: %s\n", filename, linenum, cp); exit(1); } /* Reads the server configuration file. */ void read_server_config(ServerOptions *options, const char *filename) { FILE *f; char line[1024]; char *cp, **charptr; int linenum, *intptr, i, value; ServerOpCodes opcode; f = fopen(filename, "r"); if (!f) { perror(filename); return; } linenum = 0; while (fgets(line, sizeof(line), f)) { linenum++; cp = line + strspn(line, WHITESPACE); if (!*cp || *cp == '#') continue; cp = strtok(cp, WHITESPACE); for(i = 0; cp[i]; i++) cp[i] = tolower(cp[i]); opcode = parse_token(cp, filename, linenum); switch (opcode) { case sPort: intptr = &options->port; parse_int: cp = strtok(NULL, WHITESPACE); if (!cp) { fprintf(stderr, "%s line %d: missing integer value.\n", filename, linenum); exit(1); } if (*cp == '0') /* Octal or hex */ { int base; cp++; if (*cp == 'x') /* Hex */ { cp++; base = 16; } else base = 8; value = 0; while ((base == 16 && isxdigit(*cp)) || (base == 8 && isdigit(*cp) && *cp < '8')) { value *= base; if (*cp >= 'a' && *cp <= 'f') value += *cp - 'a' + 10; else if (*cp >= 'A' && *cp <= 'F') value += *cp - 'A' + 10; else value += *cp - '0'; cp++; } } else { value = atoi(cp); } if (*intptr == -1) *intptr = value; break; case sServerKeyBits: intptr = &options->server_key_bits; goto parse_int; case sLoginGraceTime: intptr = &options->login_grace_time; goto parse_int; case sKeyRegenerationTime: intptr = &options->key_regeneration_time; goto parse_int; case sListenAddress: cp = strtok(NULL, WHITESPACE); if (!cp) { fprintf(stderr, "%s line %d: missing inet addr.\n", filename, linenum); exit(1); } #ifdef BROKEN_INET_ADDR options->listen_addr.s_addr = inet_network(cp); #else /* BROKEN_INET_ADDR */ options->listen_addr.s_addr = inet_addr(cp); #endif /* BROKEN_INET_ADDR */ break; case sHostKeyFile: charptr = &options->host_key_file; parse_pathname: cp = strtok(NULL, WHITESPACE); if (!cp) { fprintf(stderr, "%s line %d: missing file name.\n", filename, linenum); exit(1); } if (*charptr == NULL) *charptr = tilde_expand_filename(cp, getuid()); break; case sRandomSeedFile: charptr = &options->random_seed_file; goto parse_pathname; case sPidFile: charptr = &options->pid_file; goto parse_pathname; case sPermitRootLogin: cp = strtok (NULL, WHITESPACE); if (!cp) { fprintf(stderr, "%s line %d: missing yes/nopwd/no argument.\n", filename, linenum); exit(1); } for(i = 0; cp[i]; i++) cp[i] = tolower(cp[i]); if (strcmp(cp, "yes") == 0) value = 2; else if (strcmp(cp, "nopwd") == 0) value = 1; else if (strcmp(cp, "no") == 0) value = 0; else { fprintf(stderr, "%s line %d: Bad yes/nopwd/no argument: %s\n", filename, linenum, cp); exit(1); } if (options->permit_root_login == -1) options->permit_root_login = value; break; parse_flag: cp = strtok(NULL, WHITESPACE); if (!cp) { fprintf(stderr, "%s line %d: missing yes/no argument.\n", filename, linenum); exit(1); } for(i = 0; cp[i]; i++) cp[i] = tolower(cp[i]); if (strcmp(cp, "yes") == 0 || strcmp(cp, "true") == 0) value = 1; else if (strcmp(cp, "no") == 0 || strcmp(cp, "false") == 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 sIgnoreRhosts: intptr = &options->ignore_rhosts; goto parse_flag; case sIgnoreRootRhosts: intptr = &options->ignore_root_rhosts; goto parse_flag; 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; case sKerberosAuthentication: intptr = &options->kerberos_authentication; goto parse_flag; case sKerberosOrLocalPasswd: intptr = &options->kerberos_or_local_passwd; goto parse_flag; case sKerberosTgtPassing: intptr = &options->kerberos_tgt_passing; goto parse_flag; case sAllowTcpForwarding: intptr = &options->allow_tcp_forwarding; goto parse_flag; case sTISAuthentication: intptr = &options->tis_authentication; goto parse_flag; case sPasswordAuthentication: intptr = &options->password_authentication; goto parse_flag; case sUseLogin: intptr = &options->use_login; goto parse_flag; 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 sSilentDeny: intptr = &options->silent_deny; goto parse_flag; case sForcedPasswd: intptr = &options->forced_passwd_change; goto parse_flag; case sForcedEmptyPasswd: intptr = &options->forced_empty_passwd_change; goto parse_flag; case sUmask: intptr = &options->umask; goto parse_int; case sIdleTimeout: cp = strtok(NULL, WHITESPACE); if (!cp) { fprintf(stderr, "%s line %d: missing integer value.\n", filename, linenum); exit(1); } value = 0; while(isdigit(*cp)) { value *= 10; value += *cp - '0'; cp++; } *cp = tolower(*cp); if (*cp == 'w') /* Weeks */ { value *= 7 * 24 * 60 * 60; cp++; } else if (*cp == 'd') /* Days */ { value *= 24 * 60 * 60; cp++; } else if (*cp == 'h') /* Hours */ { value *= 60 * 60; cp++; } else if (*cp == 'm') /* Minutes */ { value *= 60; cp++; } else if (*cp == 's') { cp++; } options->idle_timeout = value; break; case sLogFacility: cp = strtok(NULL, WHITESPACE); if (!cp) { fprintf(stderr, "%s line %d: missing facility name.\n", filename, linenum); exit(1); } for(i = 0; cp[i]; i++) cp[i] = tolower(cp[i]); 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 sAllowSHosts: while ((cp = strtok(NULL, WHITESPACE))) { if (options->num_allow_shosts >= MAX_ALLOW_SHOSTS) { fprintf(stderr, "%s line %d: too many allow shosts.\n", filename, linenum); exit(1); } options->allow_shosts[options->num_allow_shosts++] = xstrdup(cp); } break; case sDenySHosts: while ((cp = strtok(NULL, WHITESPACE))) { if (options->num_deny_shosts >= MAX_DENY_SHOSTS) { fprintf(stderr, "%s line %d: too many deny shosts.\n", filename, linenum); exit(1); } options->deny_shosts[options->num_deny_shosts++] = xstrdup(cp); } break; case sAllowHosts: while ((cp = strtok(NULL, WHITESPACE))) { if (options->num_allow_hosts >= MAX_ALLOW_HOSTS) { fprintf(stderr, "%s line %d: too many allow hosts.\n", filename, linenum); exit(1); } options->allow_hosts[options->num_allow_hosts++] = xstrdup(cp); } break; case sDenyHosts: while ((cp = strtok(NULL, WHITESPACE))) { if (options->num_deny_hosts >= MAX_DENY_HOSTS) { fprintf(stderr, "%s line %d: too many deny hosts.\n", filename, linenum); exit(1); } options->deny_hosts[options->num_deny_hosts++] = xstrdup(cp); } 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; case sXauthPath: charptr = &options->xauth_path; goto parse_pathname; case sCheckMail: intptr = &options->check_mail; goto parse_flag; case sPasswordExpireWarningDays: intptr = &options->password_expire_warning_days; goto parse_int; case sAccountExpireWarningDays: intptr = &options->account_expire_warning_days; goto parse_int; #ifdef F_SECURE_COMMERCIAL #endif /* F_SECURE_COMMERCIAL */ 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); }