| /* |
| * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, 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("$OpenBSD: servconf.c,v 1.131 2004/04/27 09:46:37 djm Exp $"); |
| |
| #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; |
| /* Use of privilege separation or not */ |
| extern int use_privsep; |
| |
| /* Initializes the server options to their default values. */ |
| |
| 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->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->x11_forwarding = -1; |
| options->x11_display_offset = -1; |
| options->x11_use_localhost = -1; |
| options->xauth_location = NULL; |
| options->strict_modes = -1; |
| options->tcp_keep_alive = -1; |
| options->log_facility = SYSLOG_FACILITY_NOT_SET; |
| options->log_level = SYSLOG_LEVEL_NOT_SET; |
| 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; |
| options->kerberos_authentication = -1; |
| options->kerberos_or_local_passwd = -1; |
| options->kerberos_ticket_cleanup = -1; |
| options->kerberos_get_afs_token = -1; |
| options->gss_authentication=-1; |
| options->gss_cleanup_creds = -1; |
| options->password_authentication = -1; |
| 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->use_dns = -1; |
| options->client_alive_interval = -1; |
| options->client_alive_count_max = -1; |
| options->authorized_keys_file = NULL; |
| options->authorized_keys_file2 = NULL; |
| options->num_accept_env = 0; |
| |
| /* 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) |
| options->use_pam = 0; |
| |
| /* 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, 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 = 120; |
| 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->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->tcp_keep_alive == -1) |
| options->tcp_keep_alive = 1; |
| if (options->log_facility == SYSLOG_FACILITY_NOT_SET) |
| options->log_facility = SYSLOG_FACILITY_AUTH; |
| if (options->log_level == SYSLOG_LEVEL_NOT_SET) |
| options->log_level = SYSLOG_LEVEL_INFO; |
| 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 (options->kerberos_authentication == -1) |
| 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; |
| if (options->kerberos_get_afs_token == -1) |
| options->kerberos_get_afs_token = 0; |
| if (options->gss_authentication == -1) |
| options->gss_authentication = 0; |
| if (options->gss_cleanup_creds == -1) |
| options->gss_cleanup_creds = 1; |
| 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->permit_user_env == -1) |
| options->permit_user_env = 0; |
| if (options->use_login == -1) |
| options->use_login = 0; |
| 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->use_dns == -1) |
| options->use_dns = 1; |
| 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 |
| |
| } |
| |
| /* Keyword tokens. */ |
| typedef enum { |
| sBadOption, /* == unknown option */ |
| /* Portable-specific options */ |
| sUsePAM, |
| /* Standard Options */ |
| sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime, |
| sPermitRootLogin, sLogFacility, sLogLevel, |
| sRhostsRSAAuthentication, sRSAAuthentication, |
| sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup, |
| sKerberosGetAFSToken, |
| sKerberosTgtPassing, sChallengeResponseAuthentication, |
| sPasswordAuthentication, sKbdInteractiveAuthentication, sListenAddress, |
| sPrintMotd, sPrintLastLog, sIgnoreRhosts, |
| sX11Forwarding, sX11DisplayOffset, sX11UseLocalhost, |
| sStrictModes, sEmptyPasswd, sTCPKeepAlive, |
| sPermitUserEnvironment, sUseLogin, sAllowTcpForwarding, sCompression, |
| sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups, |
| sIgnoreUserKnownHosts, sCiphers, sMacs, sProtocol, sPidFile, |
| sGatewayPorts, sPubkeyAuthentication, sXAuthLocation, sSubsystem, sMaxStartups, |
| sBanner, sUseDNS, sHostbasedAuthentication, |
| sHostbasedUsesNameFromPacketOnly, sClientAliveInterval, |
| sClientAliveCountMax, sAuthorizedKeysFile, sAuthorizedKeysFile2, |
| sGssAuthentication, sGssCleanupCreds, sAcceptEnv, |
| sUsePrivilegeSeparation, |
| sDeprecated, sUnsupported |
| } ServerOpCodes; |
| |
| /* Textual representation of the tokens. */ |
| static struct { |
| const char *name; |
| ServerOpCodes opcode; |
| } keywords[] = { |
| /* Portable-specific options */ |
| #ifdef USE_PAM |
| { "usepam", sUsePAM }, |
| #else |
| { "usepam", sUnsupported }, |
| #endif |
| { "pamauthenticationviakbdint", sDeprecated }, |
| /* Standard Options */ |
| { "port", sPort }, |
| { "hostkey", sHostKeyFile }, |
| { "hostdsakey", sHostKeyFile }, /* alias */ |
| { "pidfile", sPidFile }, |
| { "serverkeybits", sServerKeyBits }, |
| { "logingracetime", sLoginGraceTime }, |
| { "keyregenerationinterval", sKeyRegenerationTime }, |
| { "permitrootlogin", sPermitRootLogin }, |
| { "syslogfacility", sLogFacility }, |
| { "loglevel", sLogLevel }, |
| { "rhostsauthentication", sDeprecated }, |
| { "rhostsrsaauthentication", sRhostsRSAAuthentication }, |
| { "hostbasedauthentication", sHostbasedAuthentication }, |
| { "hostbasedusesnamefrompacketonly", sHostbasedUsesNameFromPacketOnly }, |
| { "rsaauthentication", sRSAAuthentication }, |
| { "pubkeyauthentication", sPubkeyAuthentication }, |
| { "dsaauthentication", sPubkeyAuthentication }, /* alias */ |
| #ifdef KRB5 |
| { "kerberosauthentication", sKerberosAuthentication }, |
| { "kerberosorlocalpasswd", sKerberosOrLocalPasswd }, |
| { "kerberosticketcleanup", sKerberosTicketCleanup }, |
| #ifdef USE_AFS |
| { "kerberosgetafstoken", sKerberosGetAFSToken }, |
| #else |
| { "kerberosgetafstoken", sUnsupported }, |
| #endif |
| #else |
| { "kerberosauthentication", sUnsupported }, |
| { "kerberosorlocalpasswd", sUnsupported }, |
| { "kerberosticketcleanup", sUnsupported }, |
| { "kerberosgetafstoken", sUnsupported }, |
| #endif |
| { "kerberostgtpassing", sUnsupported }, |
| { "afstokenpassing", sUnsupported }, |
| #ifdef GSSAPI |
| { "gssapiauthentication", sGssAuthentication }, |
| { "gssapicleanupcredentials", sGssCleanupCreds }, |
| #else |
| { "gssapiauthentication", sUnsupported }, |
| { "gssapicleanupcredentials", sUnsupported }, |
| #endif |
| { "passwordauthentication", sPasswordAuthentication }, |
| { "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 }, |
| { "compression", sCompression }, |
| { "tcpkeepalive", sTCPKeepAlive }, |
| { "keepalive", sTCPKeepAlive }, /* obsolete alias */ |
| { "allowtcpforwarding", sAllowTcpForwarding }, |
| { "allowusers", sAllowUsers }, |
| { "denyusers", sDenyUsers }, |
| { "allowgroups", sAllowGroups }, |
| { "denygroups", sDenyGroups }, |
| { "ciphers", sCiphers }, |
| { "macs", sMacs }, |
| { "protocol", sProtocol }, |
| { "gatewayports", sGatewayPorts }, |
| { "subsystem", sSubsystem }, |
| { "maxstartups", sMaxStartups }, |
| { "banner", sBanner }, |
| { "usedns", sUseDNS }, |
| { "verifyreversemapping", sDeprecated }, |
| { "reversemappingcheck", sDeprecated }, |
| { "clientaliveinterval", sClientAliveInterval }, |
| { "clientalivecountmax", sClientAliveCountMax }, |
| { "authorizedkeysfile", sAuthorizedKeysFile }, |
| { "authorizedkeysfile2", sAuthorizedKeysFile2 }, |
| { "useprivilegeseparation", sUsePrivilegeSeparation}, |
| { "acceptenv", sAcceptEnv }, |
| { NULL, sBadOption } |
| }; |
| |
| /* |
| * Returns the number of the token pointed to by cp or sBadOption. |
| */ |
| |
| static ServerOpCodes |
| parse_token(const char *cp, const char *filename, |
| int linenum) |
| { |
| u_int i; |
| |
| for (i = 0; keywords[i].name; i++) |
| if (strcasecmp(cp, keywords[i].name) == 0) |
| return keywords[i].opcode; |
| |
| error("%s: line %d: Bad configuration option: %s", |
| filename, linenum, cp); |
| return sBadOption; |
| } |
| |
| 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); |
| } |
| |
| 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, "%u", port); |
| if ((gaierr = getaddrinfo(addr, strport, &hints, &aitop)) != 0) |
| fatal("bad addr or host: %s (%s)", |
| addr ? addr : "<NULL>", |
| 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) |
| { |
| char *cp, **charptr, *arg, *p; |
| int *intptr, value, i, n; |
| ServerOpCodes opcode; |
| |
| 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: |
| 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 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 sKerberosGetAFSToken: |
| intptr = &options->kerberos_get_afs_token; |
| goto parse_flag; |
| |
| case sGssAuthentication: |
| intptr = &options->gss_authentication; |
| goto parse_flag; |
| |
| case sGssCleanupCreds: |
| intptr = &options->gss_cleanup_creds; |
| 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 sTCPKeepAlive: |
| intptr = &options->tcp_keep_alive; |
| 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 sUseDNS: |
| intptr = &options->use_dns; |
| 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 : "<NONE>"); |
| 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 : "<NONE>"); |
| 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 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 : "<NONE>"); |
| 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 : "<NONE>"); |
| 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 : "<NONE>"); |
| 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 sAcceptEnv: |
| while ((arg = strdelim(&cp)) && *arg != '\0') { |
| if (strchr(arg, '=') != NULL) |
| fatal("%s line %d: Invalid environment name.", |
| filename, linenum); |
| if (options->num_accept_env >= MAX_ACCEPT_ENV) |
| fatal("%s line %d: too many allow env.", |
| filename, linenum); |
| options->accept_env[options->num_accept_env++] = |
| xstrdup(arg); |
| } |
| break; |
| |
| 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); |
| } |
| 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); |
| } |