X-Git-Url: http://andersk.mit.edu/gitweb/openssh.git/blobdiff_plain/a306f2dd74b7488671decc385f82830c98f4a0d3..09ab32966bde7f08cedb7b029981b6cec2e7307a:/servconf.c diff --git a/servconf.c b/servconf.c index 21123144..f37193a8 100644 --- a/servconf.c +++ b/servconf.c @@ -1,26 +1,56 @@ /* - * - * servconf.c - * - * Author: Tatu Ylonen - * * Copyright (c) 1995 Tatu Ylonen , Espoo, Finland * All rights reserved * - * Created: Mon Aug 21 15:48:58 1995 ylo - * + * 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 1.121 2003/05/15 14:02:47 jakob Exp $"); + +#if defined(KRB4) +#include +#endif + +#if defined(KRB5) +# ifdef HEIMDAL +# include +# else +/* + * XXX: Bodge - but then, so is using the kerberos IV KEYFILE to get a + * Kerberos V keytab + */ +# define KEYFILE "/etc/krb5.keytab" +# endif +#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); -/* add listen address */ -void add_listen_addr(ServerOptions *options, char *addr); +/* AF_UNSPEC or AF_INET or AF_INET6 */ +extern int IPv4or6; +/* Use of privilege separation or not */ +extern int use_privsep; /* Initializes the server options to their default values. */ @@ -28,146 +58,239 @@ void initialize_server_options(ServerOptions *options) { memset(options, 0, sizeof(*options)); + + /* Portable-specific options */ + options->use_pam = -1; + + /* Standard Options */ options->num_ports = 0; options->ports_from_cmdline = 0; options->listen_addrs = NULL; - options->host_key_file = NULL; - options->dsa_key_file = 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 = -1; + options->permit_root_login = PERMIT_NOT_SET; options->ignore_rhosts = -1; options->ignore_user_known_hosts = -1; options->print_motd = -1; - options->check_mail = -1; + options->print_lastlog = -1; options->x11_forwarding = -1; options->x11_display_offset = -1; + options->x11_use_localhost = -1; + options->xauth_location = NULL; options->strict_modes = -1; options->keepalives = -1; - options->log_facility = (SyslogFacility) - 1; - options->log_level = (LogLevel) - 1; + options->log_facility = SYSLOG_FACILITY_NOT_SET; + options->log_level = SYSLOG_LEVEL_NOT_SET; 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; -#ifdef KRB4 + options->pubkey_authentication = -1; 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; -#endif options->password_authentication = -1; -#ifdef SKEY - options->skey_authentication = -1; -#endif + options->kbd_interactive_authentication = -1; + options->challenge_response_authentication = -1; options->permit_empty_passwd = -1; + options->permit_user_env = -1; options->use_login = -1; + options->compression = -1; + options->allow_tcp_forwarding = -1; options->num_allow_users = 0; options->num_deny_users = 0; options->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->verify_reverse_mapping = -1; + options->client_alive_interval = -1; + options->client_alive_count_max = -1; + options->authorized_keys_file = NULL; + options->authorized_keys_file2 = NULL; + + /* Needs to be accessable in many places */ + use_privsep = -1; } void fill_default_server_options(ServerOptions *options) { + /* Portable-specific options */ + if (options->use_pam == -1) +#ifdef USE_PAM + options->use_pam = 1; +#else + options->use_pam = 0; +#endif + + /* Standard Options */ + 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_RSA_KEY_FILE; + options->host_key_files[options->num_host_key_files++] = + _PATH_HOST_DSA_KEY_FILE; + } + } if (options->num_ports == 0) options->ports[options->num_ports++] = SSH_DEFAULT_PORT; if (options->listen_addrs == NULL) - add_listen_addr(options, NULL); - if (options->host_key_file == NULL) - options->host_key_file = HOST_KEY_FILE; - if (options->dsa_key_file == NULL) - options->dsa_key_file = DSA_KEY_FILE; + 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; + options->login_grace_time = 120; 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->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; + if (options->x11_use_localhost == -1) + options->x11_use_localhost = 1; + if (options->xauth_location == NULL) + options->xauth_location = _PATH_XAUTH; if (options->strict_modes == -1) options->strict_modes = 1; if (options->keepalives == -1) options->keepalives = 1; - if (options->log_facility == (SyslogFacility) (-1)) + if (options->log_facility == SYSLOG_FACILITY_NOT_SET) options->log_facility = SYSLOG_FACILITY_AUTH; - if (options->log_level == (LogLevel) (-1)) + if (options->log_level == SYSLOG_LEVEL_NOT_SET) options->log_level = SYSLOG_LEVEL_INFO; if (options->rhosts_authentication == -1) options->rhosts_authentication = 0; if (options->rhosts_rsa_authentication == -1) options->rhosts_rsa_authentication = 0; + if (options->hostbased_authentication == -1) + options->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; -#ifdef KRB4 + if (options->pubkey_authentication == -1) + options->pubkey_authentication = 1; if (options->kerberos_authentication == -1) - options->kerberos_authentication = (access(KEYFILE, R_OK) == 0); + options->kerberos_authentication = 0; if (options->kerberos_or_local_passwd == -1) options->kerberos_or_local_passwd = 1; if (options->kerberos_ticket_cleanup == -1) options->kerberos_ticket_cleanup = 1; -#endif /* 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 */ + options->afs_token_passing = 0; if (options->password_authentication == -1) options->password_authentication = 1; -#ifdef SKEY - if (options->skey_authentication == -1) - options->skey_authentication = 1; -#endif + 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->permit_user_env == -1) + options->permit_user_env = 0; if (options->use_login == -1) options->use_login = 0; - if (options->protocol == SSH_PROTO_UNKNOWN) - options->protocol = SSH_PROTO_1|SSH_PROTO_2; -} + if (options->compression == -1) + options->compression = 1; + 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->verify_reverse_mapping == -1) + options->verify_reverse_mapping = 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_file2 == NULL) { + /* authorized_keys_file2 falls back to authorized_keys_file */ + if (options->authorized_keys_file != NULL) + options->authorized_keys_file2 = options->authorized_keys_file; + else + options->authorized_keys_file2 = _PATH_SSH_USER_PERMITTED_KEYS2; + } + if (options->authorized_keys_file == NULL) + options->authorized_keys_file = _PATH_SSH_USER_PERMITTED_KEYS; + + /* Turn privilege separation on by default */ + if (use_privsep == -1) + use_privsep = 1; + +#ifndef HAVE_MMAP + if (use_privsep && options->compression == 1) { + error("This platform does not support both privilege " + "separation and compression"); + error("Compression disabled"); + options->compression = 0; + } +#endif -#define WHITESPACE " \t\r\n" +} /* Keyword tokens. */ typedef enum { sBadOption, /* == unknown option */ + /* Portable-specific options */ + sUsePAM, + /* Standard Options */ sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime, sPermitRootLogin, sLogFacility, sLogLevel, sRhostsAuthentication, sRhostsRSAAuthentication, sRSAAuthentication, -#ifdef KRB4 sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup, -#endif -#ifdef AFS - sKerberosTgtPassing, sAFSTokenPassing, -#endif -#ifdef SKEY - sSkeyAuthentication, -#endif - sPasswordAuthentication, sListenAddress, - sPrintMotd, sIgnoreRhosts, sX11Forwarding, sX11DisplayOffset, - sStrictModes, sEmptyPasswd, sRandomSeedFile, sKeepAlives, sCheckMail, - sUseLogin, sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups, - sIgnoreUserKnownHosts, sDSAKeyFile, sCiphers, sProtocol + sKerberosTgtPassing, sAFSTokenPassing, sChallengeResponseAuthentication, + sPasswordAuthentication, sKbdInteractiveAuthentication, sListenAddress, + sPrintMotd, sPrintLastLog, sIgnoreRhosts, + sX11Forwarding, sX11DisplayOffset, sX11UseLocalhost, + sStrictModes, sEmptyPasswd, sKeepAlives, + sPermitUserEnvironment, sUseLogin, sAllowTcpForwarding, sCompression, + sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups, + sIgnoreUserKnownHosts, sCiphers, sMacs, sProtocol, sPidFile, + sGatewayPorts, sPubkeyAuthentication, sXAuthLocation, sSubsystem, sMaxStartups, + sBanner, sVerifyReverseMapping, sHostbasedAuthentication, + sHostbasedUsesNameFromPacketOnly, sClientAliveInterval, + sClientAliveCountMax, sAuthorizedKeysFile, sAuthorizedKeysFile2, + sUsePrivilegeSeparation, + sDeprecated, sUnsupported } ServerOpCodes; /* Textual representation of the tokens. */ @@ -175,9 +298,13 @@ static struct { const char *name; ServerOpCodes opcode; } keywords[] = { + /* Portable-specific options */ + { "UsePAM", sUsePAM }, + /* Standard Options */ { "port", sPort }, { "hostkey", sHostKeyFile }, - { "dsakey", sDSAKeyFile }, + { "hostdsakey", sHostKeyFile }, /* alias */ + { "pidfile", sPidFile }, { "serverkeybits", sServerKeyBits }, { "logingracetime", sLoginGraceTime }, { "keyregenerationinterval", sKeyRegenerationTime }, @@ -186,408 +313,640 @@ static struct { { "loglevel", sLogLevel }, { "rhostsauthentication", sRhostsAuthentication }, { "rhostsrsaauthentication", sRhostsRSAAuthentication }, + { "hostbasedauthentication", sHostbasedAuthentication }, + { "hostbasedusesnamefrompacketonly", sHostbasedUsesNameFromPacketOnly }, { "rsaauthentication", sRSAAuthentication }, -#ifdef KRB4 + { "pubkeyauthentication", sPubkeyAuthentication }, + { "dsaauthentication", sPubkeyAuthentication }, /* alias */ +#if defined(KRB4) || defined(KRB5) { "kerberosauthentication", sKerberosAuthentication }, { "kerberosorlocalpasswd", sKerberosOrLocalPasswd }, { "kerberosticketcleanup", sKerberosTicketCleanup }, -#endif -#ifdef AFS { "kerberostgtpassing", sKerberosTgtPassing }, +#else + { "kerberosauthentication", sUnsupported }, + { "kerberosorlocalpasswd", sUnsupported }, + { "kerberosticketcleanup", sUnsupported }, + { "kerberostgtpassing", sUnsupported }, +#endif +#if defined(AFS) { "afstokenpassing", sAFSTokenPassing }, +#else + { "afstokenpassing", sUnsupported }, #endif { "passwordauthentication", sPasswordAuthentication }, -#ifdef SKEY - { "skeyauthentication", sSkeyAuthentication }, -#endif - { "checkmail", sCheckMail }, + { "kbdinteractiveauthentication", sKbdInteractiveAuthentication }, + { "challengeresponseauthentication", sChallengeResponseAuthentication }, + { "skeyauthentication", sChallengeResponseAuthentication }, /* alias */ + { "checkmail", sDeprecated }, { "listenaddress", sListenAddress }, { "printmotd", sPrintMotd }, + { "printlastlog", sPrintLastLog }, { "ignorerhosts", sIgnoreRhosts }, { "ignoreuserknownhosts", sIgnoreUserKnownHosts }, { "x11forwarding", sX11Forwarding }, { "x11displayoffset", sX11DisplayOffset }, + { "x11uselocalhost", sX11UseLocalhost }, + { "xauthlocation", sXAuthLocation }, { "strictmodes", sStrictModes }, { "permitemptypasswords", sEmptyPasswd }, + { "permituserenvironment", sPermitUserEnvironment }, { "uselogin", sUseLogin }, - { "randomseed", sRandomSeedFile }, + { "compression", sCompression }, { "keepalive", sKeepAlives }, + { "allowtcpforwarding", sAllowTcpForwarding }, { "allowusers", sAllowUsers }, { "denyusers", sDenyUsers }, { "allowgroups", sAllowGroups }, { "denygroups", sDenyGroups }, { "ciphers", sCiphers }, + { "macs", sMacs }, { "protocol", sProtocol }, - { NULL, 0 } + { "gatewayports", sGatewayPorts }, + { "subsystem", sSubsystem }, + { "maxstartups", sMaxStartups }, + { "banner", sBanner }, + { "verifyreversemapping", sVerifyReverseMapping }, + { "reversemappingcheck", sVerifyReverseMapping }, + { "clientaliveinterval", sClientAliveInterval }, + { "clientalivecountmax", sClientAliveCountMax }, + { "authorizedkeysfile", sAuthorizedKeysFile }, + { "authorizedkeysfile2", sAuthorizedKeysFile2 }, + { "useprivilegeseparation", sUsePrivilegeSeparation}, + { NULL, sBadOption } }; /* - * Returns the number of the token pointed to by cp of length len. Never - * returns if the token is not known. + * Returns the number of the token pointed to by cp or sBadOption. */ static ServerOpCodes parse_token(const char *cp, const char *filename, int linenum) { - unsigned int i; + u_int i; for (i = 0; keywords[i].name; i++) if (strcasecmp(cp, keywords[i].name) == 0) return keywords[i].opcode; - fprintf(stderr, "%s: line %d: Bad configuration option: %s\n", - filename, linenum, cp); + error("%s: line %d: Bad configuration option: %s", + filename, linenum, cp); return sBadOption; } -/* - * add listen address - */ -void -add_listen_addr(ServerOptions *options, char *addr) +static void +add_listen_addr(ServerOptions *options, char *addr, u_short port) { - extern int IPv4or6; - struct addrinfo hints, *ai, *aitop; - char strport[NI_MAXSERV]; - int gaierr; int i; if (options->num_ports == 0) options->ports[options->num_ports++] = SSH_DEFAULT_PORT; - for (i = 0; i < options->num_ports; i++) { - 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", options->ports[i]); - if ((gaierr = getaddrinfo(addr, strport, &hints, &aitop)) != 0) - fatal("bad addr or host: %s (%s)\n", - 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; - } + 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); } -/* Reads the server configuration file. */ +static void +add_one_listen_addr(ServerOptions *options, char *addr, u_short port) +{ + struct addrinfo hints, *ai, *aitop; + char strport[NI_MAXSERV]; + int gaierr; -void -read_server_config(ServerOptions *options, const char *filename) + 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, "%u", 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; +} + +int +process_server_config_line(ServerOptions *options, char *line, + const char *filename, int linenum) { - FILE *f; - char line[1024]; - char *cp, **charptr; - int linenum, *intptr, value; - int bad_options = 0; + char *cp, **charptr, *arg, *p; + int *intptr, value, i, n; 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); - opcode = parse_token(cp, 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.\n", filename, linenum); - if (options->num_ports >= MAX_PORTS) - fatal("%s line %d: too many ports.\n", - filename, linenum); - cp = strtok(NULL, WHITESPACE); - if (!cp) - fatal("%s line %d: missing port number.\n", - filename, linenum); - options->ports[options->num_ports++] = atoi(cp); - break; - - case sServerKeyBits: - intptr = &options->server_key_bits; + cp = line; + arg = strdelim(&cp); + /* Ignore leading whitespace */ + if (*arg == '\0') + arg = strdelim(&cp); + if (!arg || !*arg || *arg == '#') + return 0; + intptr = NULL; + charptr = NULL; + opcode = parse_token(arg, filename, linenum); + switch (opcode) { + /* Portable-specific options */ + case sUsePAM: + intptr = &options->use_pam; + goto parse_flag; + + /* Standard Options */ + case sBadOption: + return -1; + case sPort: + /* ignore ports from configfile if cmdline specifies ports */ + if (options->ports_from_cmdline) + return 0; + if (options->listen_addrs != NULL) + fatal("%s line %d: ports must be specified before " + "ListenAddress.", filename, linenum); + if (options->num_ports >= MAX_PORTS) + fatal("%s line %d: too many ports.", + filename, linenum); + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: missing port number.", + filename, linenum); + options->ports[options->num_ports++] = a2port(arg); + if (options->ports[options->num_ports-1] == 0) + fatal("%s line %d: Badly formatted port number.", + filename, linenum); + break; + + case sServerKeyBits: + intptr = &options->server_key_bits; parse_int: - 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 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) - fatal("%s line %d: missing inet addr.\n", + 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); - add_listen_addr(options, cp); - break; - - case sHostKeyFile: - case sDSAKeyFile: - charptr = (opcode == sHostKeyFile ) ? - &options->host_key_file : &options->dsa_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; + 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; - 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; + p++; + if (*p == '\0') + fatal("%s line %d: bad inet addr:port usage.", + filename, linenum); else { - fprintf(stderr, "%s line %d: Bad yes/no argument: %s\n", - filename, linenum, cp); - exit(1); - } - 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 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: - intptr = (int *) &options->log_facility; - cp = strtok(NULL, WHITESPACE); - value = log_facility_number(cp); - if (value == (SyslogFacility) - 1) - fatal("%.200s line %d: unsupported log facility '%s'\n", - filename, linenum, cp ? cp : ""); - if (*intptr == -1) - *intptr = (SyslogFacility) value; - break; - - case sLogLevel: - intptr = (int *) &options->log_level; - cp = strtok(NULL, WHITESPACE); - value = log_level_number(cp); - if (value == (LogLevel) - 1) - fatal("%.200s line %d: unsupported log level '%s'\n", - filename, linenum, cp ? cp : ""); - if (*intptr == -1) - *intptr = (LogLevel) value; - break; - - case sAllowUsers: - while ((cp = strtok(NULL, WHITESPACE))) { - if (options->num_allow_users >= MAX_ALLOW_USERS) - fatal("%s line %d: too many allow users.\n", - filename, linenum); - 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) - fatal( "%s line %d: too many deny users.\n", - filename, linenum); - 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) - fatal("%s line %d: too many allow groups.\n", - filename, linenum); - 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) - fatal("%s line %d: too many deny groups.\n", + *(p-1) = '\0'; + if ((port = a2port(p)) == 0) + fatal("%s line %d: bad port number.", filename, linenum); - options->deny_groups[options->num_deny_groups++] = xstrdup(cp); + add_listen_addr(options, arg, port); } - break; + } 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; + + case sKerberosAuthentication: + intptr = &options->kerberos_authentication; + goto parse_flag; + + case sKerberosOrLocalPasswd: + intptr = &options->kerberos_or_local_passwd; + goto parse_flag; + + case sKerberosTicketCleanup: + intptr = &options->kerberos_ticket_cleanup; + goto parse_flag; + + case sKerberosTgtPassing: + intptr = &options->kerberos_tgt_passing; + goto parse_flag; + + case sAFSTokenPassing: + intptr = &options->afs_token_passing; + goto parse_flag; + + case sPasswordAuthentication: + intptr = &options->password_authentication; + goto parse_flag; + + case sKbdInteractiveAuthentication: + intptr = &options->kbd_interactive_authentication; + goto parse_flag; + + case sChallengeResponseAuthentication: + intptr = &options->challenge_response_authentication; + goto parse_flag; + + case sPrintMotd: + intptr = &options->print_motd; + goto parse_flag; + + case sPrintLastLog: + intptr = &options->print_lastlog; + goto parse_flag; + + case sX11Forwarding: + intptr = &options->x11_forwarding; + goto parse_flag; + + case sX11DisplayOffset: + intptr = &options->x11_display_offset; + goto parse_int; + + case sX11UseLocalhost: + intptr = &options->x11_use_localhost; + goto parse_flag; + + case sXAuthLocation: + charptr = &options->xauth_location; + goto parse_filename; + + case sStrictModes: + intptr = &options->strict_modes; + goto parse_flag; + + case sKeepAlives: + intptr = &options->keepalives; + goto parse_flag; + + case sEmptyPasswd: + intptr = &options->permit_empty_passwd; + goto parse_flag; + + case sPermitUserEnvironment: + intptr = &options->permit_user_env; + goto parse_flag; + + case sUseLogin: + intptr = &options->use_login; + goto parse_flag; + + case sCompression: + intptr = &options->compression; + goto parse_flag; + + case sGatewayPorts: + intptr = &options->gateway_ports; + goto parse_flag; + + case sVerifyReverseMapping: + intptr = &options->verify_reverse_mapping; + goto parse_flag; + + case sLogFacility: + intptr = (int *) &options->log_facility; + arg = strdelim(&cp); + value = log_facility_number(arg); + if (value == SYSLOG_FACILITY_NOT_SET) + fatal("%.200s line %d: unsupported log facility '%s'", + filename, linenum, arg ? arg : ""); + if (*intptr == -1) + *intptr = (SyslogFacility) value; + break; + + case sLogLevel: + intptr = (int *) &options->log_level; + arg = strdelim(&cp); + value = log_level_number(arg); + if (value == SYSLOG_LEVEL_NOT_SET) + fatal("%.200s line %d: unsupported log level '%s'", + filename, linenum, arg ? arg : ""); + if (*intptr == -1) + *intptr = (LogLevel) value; + break; + + case sAllowTcpForwarding: + intptr = &options->allow_tcp_forwarding; + goto parse_flag; + + case sUsePrivilegeSeparation: + intptr = &use_privsep; + goto parse_flag; + + case sAllowUsers: + while ((arg = strdelim(&cp)) && *arg != '\0') { + if (options->num_allow_users >= MAX_ALLOW_USERS) + fatal("%s line %d: too many allow users.", + filename, linenum); + options->allow_users[options->num_allow_users++] = + xstrdup(arg); + } + break; - case sCiphers: - cp = strtok(NULL, WHITESPACE); - if (!ciphers_valid(cp)) - fatal("%s line %d: Bad cipher spec '%s'.", - filename, linenum, cp ? cp : ""); - if (options->ciphers == NULL) - options->ciphers = xstrdup(cp); - 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 sProtocol: - intptr = &options->protocol; - cp = strtok(NULL, WHITESPACE); - value = proto_spec(cp); - if (value == SSH_PROTO_UNKNOWN) - fatal("%s line %d: Bad protocol spec '%s'.", - filename, linenum, cp ? cp : ""); - if (*intptr == SSH_PROTO_UNKNOWN) - *intptr = value; - 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; - default: - fprintf(stderr, "%s line %d: Missing handler for opcode %s (%d)\n", - filename, linenum, cp, opcode); - exit(1); + 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); } - if (strtok(NULL, WHITESPACE) != NULL) { - fprintf(stderr, "%s line %d: garbage at end of line.\n", - filename, linenum); - exit(1); + 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 sDeprecated: + logit("%s line %d: Deprecated option %s", + filename, linenum, arg); + while (arg) + arg = strdelim(&cp); + break; + + case sUnsupported: + logit("%s line %d: Unsupported option %s", + filename, linenum, arg); + while (arg) + arg = strdelim(&cp); + break; + + default: + fatal("%s line %d: Missing handler for opcode %s (%d)", + filename, linenum, arg, opcode); } - fclose(f); - if (bad_options > 0) { - fprintf(stderr, "%s: terminating, %d bad configuration options\n", - filename, bad_options); + if ((arg = strdelim(&cp)) != NULL && *arg != '\0') + fatal("%s line %d: garbage at end of line; \"%.200s\".", + filename, linenum, arg); + return 0; +} + +/* Reads the server configuration file. */ + +void +read_server_config(ServerOptions *options, const char *filename) +{ + int linenum, bad_options = 0; + char line[1024]; + FILE *f; + + debug2("read_server_config: filename %s", filename); + f = fopen(filename, "r"); + if (!f) { + perror(filename); exit(1); } + linenum = 0; + while (fgets(line, sizeof(line), f)) { + /* Update line number counter. */ + linenum++; + if (process_server_config_line(options, line, filename, linenum) != 0) + bad_options++; + } + fclose(f); + if (bad_options > 0) + fatal("%s: terminating, %d bad configuration options", + filename, bad_options); }