X-Git-Url: http://andersk.mit.edu/gitweb/openssh.git/blobdiff_plain/6fa724bc01e9dd20a7f7e1b78ddc9a3ba7b42006..dd2495cba27edd8a16dca65037ccceb7128d3509:/servconf.c diff --git a/servconf.c b/servconf.c index f573e9af..0f16c851 100644 --- a/servconf.c +++ b/servconf.c @@ -1,609 +1,861 @@ /* - -servconf.c - -Author: Tatu Ylonen - -Copyright (c) 1995 Tatu Ylonen , Espoo, Finland - All rights reserved - -Created: Mon Aug 21 15:48:58 1995 ylo - -*/ + * Copyright (c) 1995 Tatu Ylonen , Espoo, Finland + * All rights reserved + * + * As far as I am concerned, the code I have written for this software + * can be used freely for any purpose. Any derived versions of this + * software must be clearly marked as such, and if the derived work is + * incompatible with the protocol description in the RFC file, it must be + * called by a name other than "ssh" or "Secure Shell". + */ #include "includes.h" -RCSID("$Id$"); +RCSID("$OpenBSD: servconf.c,v 1.88 2001/07/11 00:24:53 itojun Exp $"); + +#if defined(KRB4) || defined(KRB5) +#include +#endif +#ifdef AFS +#include +#endif #include "ssh.h" +#include "log.h" #include "servconf.h" #include "xmalloc.h" +#include "compat.h" +#include "pathnames.h" +#include "tildexpand.h" +#include "misc.h" +#include "cipher.h" +#include "kex.h" +#include "mac.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; /* Initializes the server options to their default values. */ -void initialize_server_options(ServerOptions *options) +void +initialize_server_options(ServerOptions *options) { - memset(options, 0, sizeof(*options)); - options->port = -1; - options->listen_addr.s_addr = htonl(INADDR_ANY); - options->host_key_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_user_known_hosts = -1; - options->print_motd = -1; - options->check_mail = -1; - options->x11_forwarding = -1; - options->x11_display_offset = -1; - options->strict_modes = -1; - options->keepalives = -1; - options->log_facility = (SyslogFacility)-1; - options->log_level = (LogLevel)-1; - options->rhosts_authentication = -1; - options->rhosts_rsa_authentication = -1; - options->rsa_authentication = -1; -#ifdef KRB4 - options->kerberos_authentication = -1; - options->kerberos_or_local_passwd = -1; - options->kerberos_ticket_cleanup = -1; + memset(options, 0, sizeof(*options)); + options->num_ports = 0; + options->ports_from_cmdline = 0; + options->listen_addrs = NULL; + options->num_host_key_files = 0; + options->pid_file = NULL; + options->server_key_bits = -1; + options->login_grace_time = -1; + options->key_regeneration_time = -1; + options->permit_root_login = PERMIT_NOT_SET; + options->ignore_rhosts = -1; + options->ignore_user_known_hosts = -1; + options->print_motd = -1; + options->print_lastlog = -1; + options->check_mail = -1; + options->x11_forwarding = -1; + options->x11_display_offset = -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->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 -#ifdef AFS - options->kerberos_tgt_passing = -1; - options->afs_token_passing = -1; +#if defined(AFS) || defined(KRB5) + options->kerberos_tgt_passing = -1; #endif - options->password_authentication = -1; -#ifdef SKEY - options->skey_authentication = -1; +#ifdef AFS + options->afs_token_passing = -1; #endif - options->permit_empty_passwd = -1; - options->use_login = -1; - options->num_allow_users = 0; - options->num_deny_users = 0; - options->num_allow_groups = 0; - options->num_deny_groups = 0; + options->password_authentication = -1; + options->kbd_interactive_authentication = -1; + options->challenge_response_authentication = -1; + options->permit_empty_passwd = -1; + options->use_login = -1; + options->allow_tcp_forwarding = -1; + options->num_allow_users = 0; + options->num_deny_users = 0; + options->num_allow_groups = 0; + options->num_deny_groups = 0; + options->ciphers = NULL; + options->macs = NULL; + options->protocol = SSH_PROTO_UNKNOWN; + options->gateway_ports = -1; + options->num_subsystems = 0; + options->max_startups_begin = -1; + options->max_startups_rate = -1; + options->max_startups = -1; + options->banner = NULL; + options->reverse_mapping_check = -1; + options->client_alive_interval = -1; + options->client_alive_count_max = -1; + options->authorized_keys_file = NULL; + options->authorized_keys_file2 = NULL; + options->pam_authentication_via_kbd_int = -1; } -void fill_default_server_options(ServerOptions *options) +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->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 = 1; /* yes */ - if (options->ignore_rhosts == -1) - options->ignore_rhosts = 0; - if (options->ignore_user_known_hosts == -1) - options->ignore_user_known_hosts = 0; - if (options->check_mail == -1) - options->check_mail = 0; - 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_AUTH; - if (options->log_level == (LogLevel)(-1)) - 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 = 1; - if (options->rsa_authentication == -1) - options->rsa_authentication = 1; -#ifdef KRB4 - if (options->kerberos_authentication == -1) - options->kerberos_authentication = (access(KEYFILE, R_OK) == 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 /* KRB4 */ -#ifdef AFS - if (options->kerberos_tgt_passing == -1) - options->kerberos_tgt_passing = 0; - if (options->afs_token_passing == -1) - options->afs_token_passing = k_hasafs(); -#endif /* AFS */ - if (options->password_authentication == -1) - options->password_authentication = 1; -#ifdef SKEY - if (options->skey_authentication == -1) - options->skey_authentication = 1; + if (options->protocol == SSH_PROTO_UNKNOWN) + options->protocol = SSH_PROTO_1|SSH_PROTO_2; + 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; + } + if (options->num_ports == 0) + options->ports[options->num_ports++] = SSH_DEFAULT_PORT; + if (options->listen_addrs == NULL) + add_listen_addr(options, NULL, 0); + if (options->pid_file == NULL) + options->pid_file = _PATH_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 == PERMIT_NOT_SET) + options->permit_root_login = PERMIT_YES; + if (options->ignore_rhosts == -1) + options->ignore_rhosts = 1; + if (options->ignore_user_known_hosts == -1) + options->ignore_user_known_hosts = 0; + if (options->check_mail == -1) + options->check_mail = 0; + if (options->print_motd == -1) + options->print_motd = 1; + if (options->print_lastlog == -1) + options->print_lastlog = 1; + if (options->x11_forwarding == -1) + options->x11_forwarding = 0; + if (options->x11_display_offset == -1) + options->x11_display_offset = 10; +#ifdef _PATH_XAUTH + 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)) + options->log_facility = SYSLOG_FACILITY_AUTH; + if (options->log_level == (LogLevel) (-1)) + 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->hostbased_authentication = 0; + if (options->hostbased_uses_name_from_packet_only == -1) + options->hostbased_uses_name_from_packet_only = 0; + if (options->rsa_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); + 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->permit_empty_passwd == -1) - options->permit_empty_passwd = 1; - if (options->use_login == -1) - options->use_login = 0; + if (options->password_authentication == -1) + options->password_authentication = 1; + if (options->kbd_interactive_authentication == -1) + options->kbd_interactive_authentication = 0; + if (options->challenge_response_authentication == -1) + options->challenge_response_authentication = 1; + if (options->permit_empty_passwd == -1) + options->permit_empty_passwd = 0; + if (options->use_login == -1) + options->use_login = 0; + if (options->allow_tcp_forwarding == -1) + options->allow_tcp_forwarding = 1; + if (options->gateway_ports == -1) + options->gateway_ports = 0; + if (options->max_startups == -1) + options->max_startups = 10; + if (options->max_startups_rate == -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->client_alive_interval == -1) + options->client_alive_interval = 0; + if (options->client_alive_count_max == -1) + options->client_alive_count_max = 3; + if (options->authorized_keys_file == NULL) + options->authorized_keys_file = _PATH_SSH_USER_PERMITTED_KEYS; + if (options->authorized_keys_file2 == NULL) + options->authorized_keys_file2 = _PATH_SSH_USER_PERMITTED_KEYS2; + if (options->pam_authentication_via_kbd_int == -1) + options->pam_authentication_via_kbd_int = 0; } -#define WHITESPACE " \t\r\n" - /* Keyword tokens. */ -typedef enum -{ - sBadOption, /* == unknown option */ - sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime, - sPermitRootLogin, sLogFacility, sLogLevel, - sRhostsAuthentication, sRhostsRSAAuthentication, sRSAAuthentication, -#ifdef KRB4 - sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup, +typedef enum { + sBadOption, /* == unknown option */ + sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime, + sPermitRootLogin, sLogFacility, sLogLevel, + sRhostsAuthentication, sRhostsRSAAuthentication, sRSAAuthentication, +#if defined(KRB4) || defined(KRB5) + sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup, #endif -#ifdef AFS - sKerberosTgtPassing, sAFSTokenPassing, +#if defined(AFS) || defined(KRB5) + sKerberosTgtPassing, #endif -#ifdef SKEY - sSkeyAuthentication, +#ifdef AFS + sAFSTokenPassing, #endif - sPasswordAuthentication, sListenAddress, - sPrintMotd, sIgnoreRhosts, sX11Forwarding, sX11DisplayOffset, - sStrictModes, sEmptyPasswd, sRandomSeedFile, sKeepAlives, sCheckMail, - sUseLogin, sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups, - sIgnoreUserKnownHosts + sChallengeResponseAuthentication, + sPasswordAuthentication, sKbdInteractiveAuthentication, sListenAddress, + sPrintMotd, sPrintLastLog, sIgnoreRhosts, + sX11Forwarding, sX11DisplayOffset, + sStrictModes, sEmptyPasswd, sKeepAlives, sCheckMail, + sUseLogin, sAllowTcpForwarding, + sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups, + sIgnoreUserKnownHosts, sCiphers, sMacs, sProtocol, sPidFile, + sGatewayPorts, sPubkeyAuthentication, sXAuthLocation, sSubsystem, sMaxStartups, + sBanner, sReverseMappingCheck, sHostbasedAuthentication, + sHostbasedUsesNameFromPacketOnly, sClientAliveInterval, + sClientAliveCountMax, sAuthorizedKeysFile, sAuthorizedKeysFile2, + sPAMAuthenticationViaKbdInt } 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 }, - { "syslogfacility", sLogFacility }, - { "loglevel", sLogLevel }, - { "rhostsauthentication", sRhostsAuthentication }, - { "rhostsrsaauthentication", sRhostsRSAAuthentication }, - { "rsaauthentication", sRSAAuthentication }, -#ifdef KRB4 - { "kerberosauthentication", sKerberosAuthentication }, - { "kerberosorlocalpasswd", sKerberosOrLocalPasswd }, - { "kerberosticketcleanup", sKerberosTicketCleanup }, +static struct { + const char *name; + ServerOpCodes opcode; +} keywords[] = { + { "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 }, #endif -#ifdef AFS - { "kerberostgtpassing", sKerberosTgtPassing }, - { "afstokenpassing", sAFSTokenPassing }, +#if defined(AFS) || defined(KRB5) + { "kerberostgtpassing", sKerberosTgtPassing }, #endif - { "passwordauthentication", sPasswordAuthentication }, -#ifdef SKEY - { "skeyauthentication", sSkeyAuthentication }, +#ifdef AFS + { "afstokenpassing", sAFSTokenPassing }, #endif - { "checkmail", sCheckMail }, - { "listenaddress", sListenAddress }, - { "printmotd", sPrintMotd }, - { "ignorerhosts", sIgnoreRhosts }, - { "ignoreuserknownhosts", sIgnoreUserKnownHosts }, - { "x11forwarding", sX11Forwarding }, - { "x11displayoffset", sX11DisplayOffset }, - { "strictmodes", sStrictModes }, - { "permitemptypasswords", sEmptyPasswd }, - { "uselogin", sUseLogin }, - { "randomseed", sRandomSeedFile }, - { "keepalive", sKeepAlives }, - { "allowusers", sAllowUsers }, - { "denyusers", sDenyUsers }, - { "allowgroups", sAllowGroups }, - { "denygroups", sDenyGroups }, - { NULL, 0 } + { "passwordauthentication", sPasswordAuthentication }, + { "kbdinteractiveauthentication", sKbdInteractiveAuthentication }, + { "challengeresponseauthentication", sChallengeResponseAuthentication }, + { "skeyauthentication", sChallengeResponseAuthentication }, /* alias */ + { "checkmail", sCheckMail }, + { "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 }, + { "PAMAuthenticationViaKbdInt", sPAMAuthenticationViaKbdInt }, + { 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 or sBadOption. + */ -static struct +static ServerOpCodes +parse_token(const char *cp, const char *filename, + int linenum) { - const char *name; - LogLevel level; -} log_levels[] = -{ - { "QUIET", SYSLOG_LEVEL_QUIET }, - { "FATAL", SYSLOG_LEVEL_FATAL }, - { "ERROR", SYSLOG_LEVEL_ERROR }, - { "INFO", SYSLOG_LEVEL_INFO }, - { "CHAT", SYSLOG_LEVEL_CHAT }, - { "DEBUG", SYSLOG_LEVEL_DEBUG }, - { NULL, 0 } -}; + u_int i; -/* Returns the number of the token pointed to by cp of length len. - Never returns if the token is not known. */ + for (i = 0; keywords[i].name; i++) + if (strcasecmp(cp, keywords[i].name) == 0) + return keywords[i].opcode; -static ServerOpCodes parse_token(const char *cp, const char *filename, - int linenum) -{ - unsigned int i; + error("%s: line %d: Bad configuration option: %s", + filename, linenum, cp); + return sBadOption; +} - for (i = 0; keywords[i].name; i++) - if (strcmp(cp, keywords[i].name) == 0) - return keywords[i].opcode; +static void +add_listen_addr(ServerOptions *options, char *addr, u_short port) +{ + int i; + + if (options->num_ports == 0) + options->ports[options->num_ports++] = SSH_DEFAULT_PORT; + if (port == 0) + for (i = 0; i < options->num_ports; i++) + add_one_listen_addr(options, addr, options->ports[i]); + else + add_one_listen_addr(options, addr, port); +} - fprintf(stderr, "%s: line %d: Bad configuration option: %s\n", - filename, linenum, cp); - return sBadOption; +static void +add_one_listen_addr(ServerOptions *options, char *addr, u_short port) +{ + struct addrinfo hints, *ai, *aitop; + char strport[NI_MAXSERV]; + int gaierr; + + memset(&hints, 0, sizeof(hints)); + hints.ai_family = IPv4or6; + hints.ai_socktype = SOCK_STREAM; + hints.ai_flags = (addr == NULL) ? AI_PASSIVE : 0; + snprintf(strport, sizeof strport, "%d", port); + if ((gaierr = getaddrinfo(addr, strport, &hints, &aitop)) != 0) + fatal("bad addr or host: %s (%s)", + addr ? addr : "", + gai_strerror(gaierr)); + for (ai = aitop; ai->ai_next; ai = ai->ai_next) + ; + ai->ai_next = options->listen_addrs; + options->listen_addrs = aitop; } /* Reads the server configuration file. */ -void read_server_config(ServerOptions *options, const char *filename) +void +read_server_config(ServerOptions *options, const char *filename) { - FILE *f; - char line[1024]; - char *cp, **charptr; - int linenum, *intptr, i, value; - int bad_options = 0; - ServerOpCodes opcode; - - f = fopen(filename, "r"); - if (!f) - { - perror(filename); - exit(1); - } - - linenum = 0; - while (fgets(line, sizeof(line), f)) - { - linenum++; - cp = line + strspn(line, WHITESPACE); - if (!*cp || *cp == '#') - continue; - cp = strtok(cp, WHITESPACE); - { - char *t = cp; - for (; *t != 0; t++) - if ('A' <= *t && *t <= 'Z') - *t = *t - 'A' + 'a'; /* tolower */ - - } - opcode = parse_token(cp, filename, linenum); - switch (opcode) - { - case sBadOption: - bad_options++; - continue; - 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); - } - 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); - } - options->listen_addr.s_addr = inet_addr(cp); - break; - - case sHostKeyFile: - charptr = &options->host_key_file; - 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: - fprintf(stderr, "%s line %d: \"randomseed\" option is obsolete.\n", - filename, linenum); - cp = strtok(NULL, WHITESPACE); - break; - - case sPermitRootLogin: - intptr = &options->permit_root_login; - cp = strtok(NULL, WHITESPACE); - if (!cp) - { - fprintf(stderr, "%s line %d: missing yes/without-password/no argument.\n", - filename, linenum); - exit(1); - } - if (strcmp(cp, "without-password") == 0) - value = 2; - else if (strcmp(cp, "yes") == 0) - value = 1; - else if (strcmp(cp, "no") == 0) - value = 0; - else - { - fprintf(stderr, "%s line %d: Bad yes/without-password/no argument: %s\n", - filename, linenum, cp); - exit(1); - } - 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); + FILE *f; + char line[1024]; + char *cp, **charptr, *arg, *p; + int linenum, *intptr, value; + int bad_options = 0; + ServerOpCodes opcode; + int i, n; + + f = fopen(filename, "r"); + if (!f) { + perror(filename); exit(1); - } - if (*intptr == -1) - *intptr = value; - break; - - case sIgnoreUserKnownHosts: - intptr = &options->ignore_user_known_hosts; - goto parse_int; - - 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; + } + 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; + case sPort: + /* ignore ports from configfile if cmdline specifies ports */ + if (options->ports_from_cmdline) + continue; + if (options->listen_addrs != NULL) + fatal("%s line %d: ports must be specified before " + "ListenAdress.", filename, linenum); + if (options->num_ports >= MAX_PORTS) + fatal("%s line %d: too many ports.", + filename, linenum); + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: missing port number.", + filename, linenum); + options->ports[options->num_ports++] = a2port(arg); + if (options->ports[options->num_ports-1] == 0) + fatal("%s line %d: Badly formatted port number.", + filename, linenum); + break; + + case 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); + 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; + } + break; + + case sPidFile: + charptr = &options->pid_file; + goto parse_filename; + + case sPermitRootLogin: + intptr = &options->permit_root_login; + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: missing yes/" + "without-password/forced-commands-only/no " + "argument.", filename, linenum); + value = 0; /* silence compiler */ + if (strcmp(arg, "without-password") == 0) + value = PERMIT_NO_PASSWD; + else if (strcmp(arg, "forced-commands-only") == 0) + value = PERMIT_FORCED_ONLY; + else if (strcmp(arg, "yes") == 0) + value = PERMIT_YES; + else if (strcmp(arg, "no") == 0) + value = PERMIT_NO; + else + fatal("%s line %d: Bad yes/" + "without-password/forced-commands-only/no " + "argument: %s", filename, linenum, arg); + if (*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 (*intptr == -1) + *intptr = value; + break; + + case sIgnoreUserKnownHosts: + intptr = &options->ignore_user_known_hosts; + goto parse_flag; + + case sRhostsAuthentication: + intptr = &options->rhosts_authentication; + goto parse_flag; + + case sRhostsRSAAuthentication: + intptr = &options->rhosts_rsa_authentication; + goto parse_flag; + + case sHostbasedAuthentication: + intptr = &options->hostbased_authentication; + goto parse_flag; + + 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 - -#ifdef AFS - case sKerberosTgtPassing: - intptr = &options->kerberos_tgt_passing; - goto parse_flag; - - case sAFSTokenPassing: - intptr = &options->afs_token_passing; - goto parse_flag; +#if defined(AFS) || defined(KRB5) + case sKerberosTgtPassing: + intptr = &options->kerberos_tgt_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; +#ifdef AFS + case sAFSTokenPassing: + intptr = &options->afs_token_passing; + 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 (strcasecmp(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 sLogLevel: - cp = strtok(NULL, WHITESPACE); - if (!cp) - { - fprintf(stderr, "%s line %d: missing level name.\n", - filename, linenum); - exit(1); - } - for (i = 0; log_levels[i].name; i++) - if (strcasecmp(log_levels[i].name, cp) == 0) - break; - if (!log_levels[i].name) - { - fprintf(stderr, "%s line %d: unsupported log level %s\n", - filename, linenum, cp); - exit(1); - } - if (options->log_level == (LogLevel)(-1)) - options->log_level = log_levels[i].level; - 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); + case sPasswordAuthentication: + intptr = &options->password_authentication; + goto parse_flag; + + case sKbdInteractiveAuthentication: + intptr = &options->kbd_interactive_authentication; + goto parse_flag; + + case sCheckMail: + intptr = &options->check_mail; + 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 sXAuthLocation: + charptr = &options->xauth_location; + goto parse_filename; + + 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 sGatewayPorts: + intptr = &options->gateway_ports; + goto parse_flag; + + case sReverseMappingCheck: + intptr = &options->reverse_mapping_check; + goto parse_flag; + + case sLogFacility: + intptr = (int *) &options->log_facility; + arg = strdelim(&cp); + value = log_facility_number(arg); + if (value == (SyslogFacility) - 1) + fatal("%.200s line %d: unsupported log facility '%s'", + filename, linenum, arg ? arg : ""); + if (*intptr == -1) + *intptr = (SyslogFacility) value; + break; + + case sLogLevel: + intptr = (int *) &options->log_level; + arg = strdelim(&cp); + value = log_level_number(arg); + if (value == (LogLevel) - 1) + fatal("%.200s line %d: unsupported log level '%s'", + filename, linenum, arg ? arg : ""); + if (*intptr == -1) + *intptr = (LogLevel) value; + break; + + case sAllowTcpForwarding: + intptr = &options->allow_tcp_forwarding; + 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 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 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 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 sCiphers: + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: Missing argument.", filename, linenum); + if (!ciphers_valid(arg)) + fatal("%s line %d: Bad SSH2 cipher spec '%s'.", + filename, linenum, arg ? arg : ""); + if (options->ciphers == NULL) + options->ciphers = xstrdup(arg); + break; + + case sMacs: + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: Missing argument.", filename, linenum); + if (!mac_valid(arg)) + fatal("%s line %d: Bad SSH2 mac spec '%s'.", + filename, linenum, arg ? arg : ""); + if (options->macs == NULL) + options->macs = xstrdup(arg); + break; + + case sProtocol: + intptr = &options->protocol; + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: Missing argument.", filename, linenum); + value = proto_spec(arg); + if (value == SSH_PROTO_UNKNOWN) + fatal("%s line %d: Bad protocol spec '%s'.", + filename, linenum, arg ? arg : ""); + if (*intptr == SSH_PROTO_UNKNOWN) + *intptr = value; + break; + + case sSubsystem: + if(options->num_subsystems >= MAX_SUBSYSTEMS) { + fatal("%s line %d: too many subsystems defined.", + filename, linenum); + } + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: Missing subsystem name.", + filename, linenum); + 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; + + 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 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 sPAMAuthenticationViaKbdInt: + intptr = &options->pam_authentication_via_kbd_int; + goto parse_flag; + + default: + fatal("%s line %d: Missing handler for opcode %s (%d)", + filename, linenum, arg, opcode); } - 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); + if ((arg = strdelim(&cp)) != NULL && *arg != '\0') + fatal("%s line %d: garbage at end of line; \"%.200s\".", + filename, linenum, arg); } - } - fclose(f); - if (bad_options > 0) { - fprintf(stderr, "%s: terminating, %d bad configuration options\n", - filename, bad_options); - exit(1); - } + fclose(f); + if (bad_options > 0) + fatal("%s: terminating, %d bad configuration options", + filename, bad_options); }