| /* $OpenBSD: servconf.c,v 1.178 2008/05/07 05:49:37 pyr Exp $ */ |
| /* |
| * 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" |
| |
| #include <sys/types.h> |
| #include <sys/socket.h> |
| |
| #include <netdb.h> |
| #include <pwd.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <signal.h> |
| #include <unistd.h> |
| #include <stdarg.h> |
| |
| #include "xmalloc.h" |
| #include "ssh.h" |
| #include "log.h" |
| #include "buffer.h" |
| #include "servconf.h" |
| #include "compat.h" |
| #include "pathnames.h" |
| #include "misc.h" |
| #include "cipher.h" |
| #include "key.h" |
| #include "kex.h" |
| #include "mac.h" |
| #include "match.h" |
| #include "channels.h" |
| #include "groupaccess.h" |
| |
| static void add_listen_addr(ServerOptions *, char *, u_short); |
| static void add_one_listen_addr(ServerOptions *, char *, u_short); |
| |
| /* Use of privilege separation or not */ |
| extern int use_privsep; |
| extern Buffer cfg; |
| |
| /* 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->address_family = -1; |
| 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->allow_agent_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->max_authtries = -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; |
| options->permit_tun = -1; |
| options->num_permitted_opens = -1; |
| options->adm_forced_command = NULL; |
| options->chroot_directory = NULL; |
| } |
| |
| 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 = COMP_DELAYED; |
| if (options->allow_tcp_forwarding == -1) |
| options->allow_tcp_forwarding = 1; |
| if (options->allow_agent_forwarding == -1) |
| options->allow_agent_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->max_authtries == -1) |
| options->max_authtries = DEFAULT_AUTH_FAIL_MAX; |
| 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; |
| if (options->permit_tun == -1) |
| options->permit_tun = SSH_TUNMODE_NO; |
| |
| /* 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, sAddressFamily, |
| 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, sMaxAuthTries, |
| sBanner, sUseDNS, sHostbasedAuthentication, |
| sHostbasedUsesNameFromPacketOnly, sClientAliveInterval, |
| sClientAliveCountMax, sAuthorizedKeysFile, sAuthorizedKeysFile2, |
| sGssAuthentication, sGssCleanupCreds, sAcceptEnv, sPermitTunnel, |
| sMatch, sPermitOpen, sForceCommand, sChrootDirectory, |
| sUsePrivilegeSeparation, sAllowAgentForwarding, |
| sDeprecated, sUnsupported |
| } ServerOpCodes; |
| |
| #define SSHCFG_GLOBAL 0x01 /* allowed in main section of sshd_config */ |
| #define SSHCFG_MATCH 0x02 /* allowed inside a Match section */ |
| #define SSHCFG_ALL (SSHCFG_GLOBAL|SSHCFG_MATCH) |
| |
| /* Textual representation of the tokens. */ |
| static struct { |
| const char *name; |
| ServerOpCodes opcode; |
| u_int flags; |
| } keywords[] = { |
| /* Portable-specific options */ |
| #ifdef USE_PAM |
| { "usepam", sUsePAM, SSHCFG_GLOBAL }, |
| #else |
| { "usepam", sUnsupported, SSHCFG_GLOBAL }, |
| #endif |
| { "pamauthenticationviakbdint", sDeprecated, SSHCFG_GLOBAL }, |
| /* Standard Options */ |
| { "port", sPort, SSHCFG_GLOBAL }, |
| { "hostkey", sHostKeyFile, SSHCFG_GLOBAL }, |
| { "hostdsakey", sHostKeyFile, SSHCFG_GLOBAL }, /* alias */ |
| { "pidfile", sPidFile, SSHCFG_GLOBAL }, |
| { "serverkeybits", sServerKeyBits, SSHCFG_GLOBAL }, |
| { "logingracetime", sLoginGraceTime, SSHCFG_GLOBAL }, |
| { "keyregenerationinterval", sKeyRegenerationTime, SSHCFG_GLOBAL }, |
| { "permitrootlogin", sPermitRootLogin, SSHCFG_ALL }, |
| { "syslogfacility", sLogFacility, SSHCFG_GLOBAL }, |
| { "loglevel", sLogLevel, SSHCFG_GLOBAL }, |
| { "rhostsauthentication", sDeprecated, SSHCFG_GLOBAL }, |
| { "rhostsrsaauthentication", sRhostsRSAAuthentication, SSHCFG_ALL }, |
| { "hostbasedauthentication", sHostbasedAuthentication, SSHCFG_ALL }, |
| { "hostbasedusesnamefrompacketonly", sHostbasedUsesNameFromPacketOnly, SSHCFG_GLOBAL }, |
| { "rsaauthentication", sRSAAuthentication, SSHCFG_ALL }, |
| { "pubkeyauthentication", sPubkeyAuthentication, SSHCFG_ALL }, |
| { "dsaauthentication", sPubkeyAuthentication, SSHCFG_GLOBAL }, /* alias */ |
| #ifdef KRB5 |
| { "kerberosauthentication", sKerberosAuthentication, SSHCFG_ALL }, |
| { "kerberosorlocalpasswd", sKerberosOrLocalPasswd, SSHCFG_GLOBAL }, |
| { "kerberosticketcleanup", sKerberosTicketCleanup, SSHCFG_GLOBAL }, |
| #ifdef USE_AFS |
| { "kerberosgetafstoken", sKerberosGetAFSToken, SSHCFG_GLOBAL }, |
| #else |
| { "kerberosgetafstoken", sUnsupported, SSHCFG_GLOBAL }, |
| #endif |
| #else |
| { "kerberosauthentication", sUnsupported, SSHCFG_ALL }, |
| { "kerberosorlocalpasswd", sUnsupported, SSHCFG_GLOBAL }, |
| { "kerberosticketcleanup", sUnsupported, SSHCFG_GLOBAL }, |
| { "kerberosgetafstoken", sUnsupported, SSHCFG_GLOBAL }, |
| #endif |
| { "kerberostgtpassing", sUnsupported, SSHCFG_GLOBAL }, |
| { "afstokenpassing", sUnsupported, SSHCFG_GLOBAL }, |
| #ifdef GSSAPI |
| { "gssapiauthentication", sGssAuthentication, SSHCFG_ALL }, |
| { "gssapicleanupcredentials", sGssCleanupCreds, SSHCFG_GLOBAL }, |
| #else |
| { "gssapiauthentication", sUnsupported, SSHCFG_ALL }, |
| { "gssapicleanupcredentials", sUnsupported, SSHCFG_GLOBAL }, |
| #endif |
| { "passwordauthentication", sPasswordAuthentication, SSHCFG_ALL }, |
| { "kbdinteractiveauthentication", sKbdInteractiveAuthentication, SSHCFG_ALL }, |
| { "challengeresponseauthentication", sChallengeResponseAuthentication, SSHCFG_GLOBAL }, |
| { "skeyauthentication", sChallengeResponseAuthentication, SSHCFG_GLOBAL }, /* alias */ |
| { "checkmail", sDeprecated, SSHCFG_GLOBAL }, |
| { "listenaddress", sListenAddress, SSHCFG_GLOBAL }, |
| { "addressfamily", sAddressFamily, SSHCFG_GLOBAL }, |
| { "printmotd", sPrintMotd, SSHCFG_GLOBAL }, |
| { "printlastlog", sPrintLastLog, SSHCFG_GLOBAL }, |
| { "ignorerhosts", sIgnoreRhosts, SSHCFG_GLOBAL }, |
| { "ignoreuserknownhosts", sIgnoreUserKnownHosts, SSHCFG_GLOBAL }, |
| { "x11forwarding", sX11Forwarding, SSHCFG_ALL }, |
| { "x11displayoffset", sX11DisplayOffset, SSHCFG_ALL }, |
| { "x11uselocalhost", sX11UseLocalhost, SSHCFG_ALL }, |
| { "xauthlocation", sXAuthLocation, SSHCFG_GLOBAL }, |
| { "strictmodes", sStrictModes, SSHCFG_GLOBAL }, |
| { "permitemptypasswords", sEmptyPasswd, SSHCFG_GLOBAL }, |
| { "permituserenvironment", sPermitUserEnvironment, SSHCFG_GLOBAL }, |
| { "uselogin", sUseLogin, SSHCFG_GLOBAL }, |
| { "compression", sCompression, SSHCFG_GLOBAL }, |
| { "tcpkeepalive", sTCPKeepAlive, SSHCFG_GLOBAL }, |
| { "keepalive", sTCPKeepAlive, SSHCFG_GLOBAL }, /* obsolete alias */ |
| { "allowtcpforwarding", sAllowTcpForwarding, SSHCFG_ALL }, |
| { "allowagentforwarding", sAllowAgentForwarding, SSHCFG_ALL }, |
| { "allowusers", sAllowUsers, SSHCFG_GLOBAL }, |
| { "denyusers", sDenyUsers, SSHCFG_GLOBAL }, |
| { "allowgroups", sAllowGroups, SSHCFG_GLOBAL }, |
| { "denygroups", sDenyGroups, SSHCFG_GLOBAL }, |
| { "ciphers", sCiphers, SSHCFG_GLOBAL }, |
| { "macs", sMacs, SSHCFG_GLOBAL }, |
| { "protocol", sProtocol, SSHCFG_GLOBAL }, |
| { "gatewayports", sGatewayPorts, SSHCFG_ALL }, |
| { "subsystem", sSubsystem, SSHCFG_GLOBAL }, |
| { "maxstartups", sMaxStartups, SSHCFG_GLOBAL }, |
| { "maxauthtries", sMaxAuthTries, SSHCFG_GLOBAL }, |
| { "banner", sBanner, SSHCFG_ALL }, |
| { "usedns", sUseDNS, SSHCFG_GLOBAL }, |
| { "verifyreversemapping", sDeprecated, SSHCFG_GLOBAL }, |
| { "reversemappingcheck", sDeprecated, SSHCFG_GLOBAL }, |
| { "clientaliveinterval", sClientAliveInterval, SSHCFG_GLOBAL }, |
| { "clientalivecountmax", sClientAliveCountMax, SSHCFG_GLOBAL }, |
| { "authorizedkeysfile", sAuthorizedKeysFile, SSHCFG_GLOBAL }, |
| { "authorizedkeysfile2", sAuthorizedKeysFile2, SSHCFG_GLOBAL }, |
| { "useprivilegeseparation", sUsePrivilegeSeparation, SSHCFG_GLOBAL }, |
| { "acceptenv", sAcceptEnv, SSHCFG_GLOBAL }, |
| { "permittunnel", sPermitTunnel, SSHCFG_GLOBAL }, |
| { "match", sMatch, SSHCFG_ALL }, |
| { "permitopen", sPermitOpen, SSHCFG_ALL }, |
| { "forcecommand", sForceCommand, SSHCFG_ALL }, |
| { "chrootdirectory", sChrootDirectory, SSHCFG_ALL }, |
| { NULL, sBadOption, 0 } |
| }; |
| |
| /* |
| * 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 *flags) |
| { |
| u_int i; |
| |
| for (i = 0; keywords[i].name; i++) |
| if (strcasecmp(cp, keywords[i].name) == 0) { |
| *flags = keywords[i].flags; |
| 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) |
| { |
| u_int i; |
| |
| if (options->num_ports == 0) |
| options->ports[options->num_ports++] = SSH_DEFAULT_PORT; |
| if (options->address_family == -1) |
| options->address_family = AF_UNSPEC; |
| 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 = options->address_family; |
| 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>", |
| ssh_gai_strerror(gaierr)); |
| for (ai = aitop; ai->ai_next; ai = ai->ai_next) |
| ; |
| ai->ai_next = options->listen_addrs; |
| options->listen_addrs = aitop; |
| } |
| |
| /* |
| * The strategy for the Match blocks is that the config file is parsed twice. |
| * |
| * The first time is at startup. activep is initialized to 1 and the |
| * directives in the global context are processed and acted on. Hitting a |
| * Match directive unsets activep and the directives inside the block are |
| * checked for syntax only. |
| * |
| * The second time is after a connection has been established but before |
| * authentication. activep is initialized to 2 and global config directives |
| * are ignored since they have already been processed. If the criteria in a |
| * Match block is met, activep is set and the subsequent directives |
| * processed and actioned until EOF or another Match block unsets it. Any |
| * options set are copied into the main server config. |
| * |
| * Potential additions/improvements: |
| * - Add Match support for pre-kex directives, eg Protocol, Ciphers. |
| * |
| * - Add a Tag directive (idea from David Leonard) ala pf, eg: |
| * Match Address 192.168.0.* |
| * Tag trusted |
| * Match Group wheel |
| * Tag trusted |
| * Match Tag trusted |
| * AllowTcpForwarding yes |
| * GatewayPorts clientspecified |
| * [...] |
| * |
| * - Add a PermittedChannelRequests directive |
| * Match Group shell |
| * PermittedChannelRequests session,forwarded-tcpip |
| */ |
| |
| static int |
| match_cfg_line_group(const char *grps, int line, const char *user) |
| { |
| int result = 0; |
| u_int ngrps = 0; |
| char *arg, *p, *cp, *grplist[MAX_MATCH_GROUPS]; |
| struct passwd *pw; |
| |
| /* |
| * Even if we do not have a user yet, we still need to check for |
| * valid syntax. |
| */ |
| arg = cp = xstrdup(grps); |
| while ((p = strsep(&cp, ",")) != NULL && *p != '\0') { |
| if (ngrps >= MAX_MATCH_GROUPS) { |
| error("line %d: too many groups in Match Group", line); |
| result = -1; |
| goto out; |
| } |
| grplist[ngrps++] = p; |
| } |
| |
| if (user == NULL) |
| goto out; |
| |
| if ((pw = getpwnam(user)) == NULL) { |
| debug("Can't match group at line %d because user %.100s does " |
| "not exist", line, user); |
| } else if (ga_init(pw->pw_name, pw->pw_gid) == 0) { |
| debug("Can't Match group because user %.100s not in any group " |
| "at line %d", user, line); |
| } else if (ga_match(grplist, ngrps) != 1) { |
| debug("user %.100s does not match group %.100s at line %d", |
| user, arg, line); |
| } else { |
| debug("user %.100s matched group %.100s at line %d", user, |
| arg, line); |
| result = 1; |
| } |
| out: |
| ga_free(); |
| xfree(arg); |
| return result; |
| } |
| |
| static int |
| match_cfg_line(char **condition, int line, const char *user, const char *host, |
| const char *address) |
| { |
| int result = 1; |
| char *arg, *attrib, *cp = *condition; |
| size_t len; |
| |
| if (user == NULL) |
| debug3("checking syntax for 'Match %s'", cp); |
| else |
| debug3("checking match for '%s' user %s host %s addr %s", cp, |
| user ? user : "(null)", host ? host : "(null)", |
| address ? address : "(null)"); |
| |
| while ((attrib = strdelim(&cp)) && *attrib != '\0') { |
| if ((arg = strdelim(&cp)) == NULL || *arg == '\0') { |
| error("Missing Match criteria for %s", attrib); |
| return -1; |
| } |
| len = strlen(arg); |
| if (strcasecmp(attrib, "user") == 0) { |
| if (!user) { |
| result = 0; |
| continue; |
| } |
| if (match_pattern_list(user, arg, len, 0) != 1) |
| result = 0; |
| else |
| debug("user %.100s matched 'User %.100s' at " |
| "line %d", user, arg, line); |
| } else if (strcasecmp(attrib, "group") == 0) { |
| switch (match_cfg_line_group(arg, line, user)) { |
| case -1: |
| return -1; |
| case 0: |
| result = 0; |
| } |
| } else if (strcasecmp(attrib, "host") == 0) { |
| if (!host) { |
| result = 0; |
| continue; |
| } |
| if (match_hostname(host, arg, len) != 1) |
| result = 0; |
| else |
| debug("connection from %.100s matched 'Host " |
| "%.100s' at line %d", host, arg, line); |
| } else if (strcasecmp(attrib, "address") == 0) { |
| if (!address) { |
| result = 0; |
| continue; |
| } |
| if (match_hostname(address, arg, len) != 1) |
| result = 0; |
| else |
| debug("connection from %.100s matched 'Address " |
| "%.100s' at line %d", address, arg, line); |
| } else { |
| error("Unsupported Match attribute %s", attrib); |
| return -1; |
| } |
| } |
| if (user != NULL) |
| debug3("match %sfound", result ? "" : "not "); |
| *condition = cp; |
| return result; |
| } |
| |
| #define WHITESPACE " \t\r\n" |
| |
| int |
| process_server_config_line(ServerOptions *options, char *line, |
| const char *filename, int linenum, int *activep, const char *user, |
| const char *host, const char *address) |
| { |
| char *cp, **charptr, *arg, *p; |
| int cmdline = 0, *intptr, value, n; |
| SyslogFacility *log_facility_ptr; |
| LogLevel *log_level_ptr; |
| ServerOpCodes opcode; |
| u_short port; |
| u_int i, flags = 0; |
| size_t len; |
| |
| cp = line; |
| if ((arg = strdelim(&cp)) == NULL) |
| return 0; |
| /* 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, &flags); |
| |
| if (activep == NULL) { /* We are processing a command line directive */ |
| cmdline = 1; |
| activep = &cmdline; |
| } |
| if (*activep && opcode != sMatch) |
| debug3("%s:%d setting %s %s", filename, linenum, arg, cp); |
| if (*activep == 0 && !(flags & SSHCFG_MATCH)) { |
| if (user == NULL) { |
| fatal("%s line %d: Directive '%s' is not allowed " |
| "within a Match block", filename, linenum, arg); |
| } else { /* this is a directive we have already processed */ |
| while (arg) |
| arg = strdelim(&cp); |
| return 0; |
| } |
| } |
| |
| 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 (*activep && *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 == NULL || *arg == '\0') |
| fatal("%s line %d: missing address", |
| filename, linenum); |
| /* check for bare IPv6 address: no "[]" and 2 or more ":" */ |
| if (strchr(arg, '[') == NULL && (p = strchr(arg, ':')) != NULL |
| && strchr(p+1, ':') != NULL) { |
| add_listen_addr(options, arg, 0); |
| break; |
| } |
| p = hpdelim(&arg); |
| if (p == NULL) |
| fatal("%s line %d: bad address:port usage", |
| filename, linenum); |
| p = cleanhostname(p); |
| if (arg == NULL) |
| port = 0; |
| else if ((port = a2port(arg)) == 0) |
| fatal("%s line %d: bad port number", filename, linenum); |
| |
| add_listen_addr(options, p, port); |
| |
| break; |
| |
| case sAddressFamily: |
| arg = strdelim(&cp); |
| if (!arg || *arg == '\0') |
| fatal("%s line %d: missing address family.", |
| filename, linenum); |
| intptr = &options->address_family; |
| if (options->listen_addrs != NULL) |
| fatal("%s line %d: address family must be specified before " |
| "ListenAddress.", filename, linenum); |
| if (strcasecmp(arg, "inet") == 0) |
| value = AF_INET; |
| else if (strcasecmp(arg, "inet6") == 0) |
| value = AF_INET6; |
| else if (strcasecmp(arg, "any") == 0) |
| value = AF_UNSPEC; |
| else |
| fatal("%s line %d: unsupported address family \"%s\".", |
| filename, linenum, arg); |
| if (*intptr == -1) |
| *intptr = value; |
| 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 (*activep && *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 (*activep && *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 (*activep && *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; |
| arg = strdelim(&cp); |
| if (!arg || *arg == '\0') |
| fatal("%s line %d: missing yes/no/delayed " |
| "argument.", filename, linenum); |
| value = 0; /* silence compiler */ |
| if (strcmp(arg, "delayed") == 0) |
| value = COMP_DELAYED; |
| else if (strcmp(arg, "yes") == 0) |
| value = COMP_ZLIB; |
| else if (strcmp(arg, "no") == 0) |
| value = COMP_NONE; |
| else |
| fatal("%s line %d: Bad yes/no/delayed " |
| "argument: %s", filename, linenum, arg); |
| if (*intptr == -1) |
| *intptr = value; |
| break; |
| |
| case sGatewayPorts: |
| intptr = &options->gateway_ports; |
| arg = strdelim(&cp); |
| if (!arg || *arg == '\0') |
| fatal("%s line %d: missing yes/no/clientspecified " |
| "argument.", filename, linenum); |
| value = 0; /* silence compiler */ |
| if (strcmp(arg, "clientspecified") == 0) |
| value = 2; |
| else if (strcmp(arg, "yes") == 0) |
| value = 1; |
| else if (strcmp(arg, "no") == 0) |
| value = 0; |
| else |
| fatal("%s line %d: Bad yes/no/clientspecified " |
| "argument: %s", filename, linenum, arg); |
| if (*activep && *intptr == -1) |
| *intptr = value; |
| break; |
| |
| case sUseDNS: |
| intptr = &options->use_dns; |
| goto parse_flag; |
| |
| case sLogFacility: |
| log_facility_ptr = &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 (*log_facility_ptr == -1) |
| *log_facility_ptr = (SyslogFacility) value; |
| break; |
| |
| case sLogLevel: |
| log_level_ptr = &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 (*log_level_ptr == -1) |
| *log_level_ptr = (LogLevel) value; |
| break; |
| |
| case sAllowTcpForwarding: |
| intptr = &options->allow_tcp_forwarding; |
| goto parse_flag; |
| |
| case sAllowAgentForwarding: |
| intptr = &options->allow_agent_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); |
| if (!*activep) { |
| arg = strdelim(&cp); |
| break; |
| } |
| 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); |
| |
| /* Collect arguments (separate to executable) */ |
| p = xstrdup(arg); |
| len = strlen(p) + 1; |
| while ((arg = strdelim(&cp)) != NULL && *arg != '\0') { |
| len += 1 + strlen(arg); |
| p = xrealloc(p, 1, len); |
| strlcat(p, " ", len); |
| strlcat(p, arg, len); |
| } |
| options->subsystem_args[options->num_subsystems] = p; |
| 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 sMaxAuthTries: |
| intptr = &options->max_authtries; |
| goto parse_int; |
| |
| 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); |
| if (!*activep) |
| break; |
| options->accept_env[options->num_accept_env++] = |
| xstrdup(arg); |
| } |
| break; |
| |
| case sPermitTunnel: |
| intptr = &options->permit_tun; |
| arg = strdelim(&cp); |
| if (!arg || *arg == '\0') |
| fatal("%s line %d: Missing yes/point-to-point/" |
| "ethernet/no argument.", filename, linenum); |
| value = 0; /* silence compiler */ |
| if (strcasecmp(arg, "ethernet") == 0) |
| value = SSH_TUNMODE_ETHERNET; |
| else if (strcasecmp(arg, "point-to-point") == 0) |
| value = SSH_TUNMODE_POINTOPOINT; |
| else if (strcasecmp(arg, "yes") == 0) |
| value = SSH_TUNMODE_YES; |
| else if (strcasecmp(arg, "no") == 0) |
| value = SSH_TUNMODE_NO; |
| else |
| fatal("%s line %d: Bad yes/point-to-point/ethernet/" |
| "no argument: %s", filename, linenum, arg); |
| if (*intptr == -1) |
| *intptr = value; |
| break; |
| |
| case sMatch: |
| if (cmdline) |
| fatal("Match directive not supported as a command-line " |
| "option"); |
| value = match_cfg_line(&cp, linenum, user, host, address); |
| if (value < 0) |
| fatal("%s line %d: Bad Match condition", filename, |
| linenum); |
| *activep = value; |
| break; |
| |
| case sPermitOpen: |
| arg = strdelim(&cp); |
| if (!arg || *arg == '\0') |
| fatal("%s line %d: missing PermitOpen specification", |
| filename, linenum); |
| n = options->num_permitted_opens; /* modified later */ |
| if (strcmp(arg, "any") == 0) { |
| if (*activep && n == -1) { |
| channel_clear_adm_permitted_opens(); |
| options->num_permitted_opens = 0; |
| } |
| break; |
| } |
| if (*activep && n == -1) |
| channel_clear_adm_permitted_opens(); |
| for (; arg != NULL && *arg != '\0'; arg = strdelim(&cp)) { |
| p = hpdelim(&arg); |
| if (p == NULL) |
| fatal("%s line %d: missing host in PermitOpen", |
| filename, linenum); |
| p = cleanhostname(p); |
| if (arg == NULL || (port = a2port(arg)) == 0) |
| fatal("%s line %d: bad port number in " |
| "PermitOpen", filename, linenum); |
| if (*activep && n == -1) |
| options->num_permitted_opens = |
| channel_add_adm_permitted_opens(p, port); |
| } |
| break; |
| |
| case sForceCommand: |
| if (cp == NULL) |
| fatal("%.200s line %d: Missing argument.", filename, |
| linenum); |
| len = strspn(cp, WHITESPACE); |
| if (*activep && options->adm_forced_command == NULL) |
| options->adm_forced_command = xstrdup(cp + len); |
| return 0; |
| |
| case sChrootDirectory: |
| charptr = &options->chroot_directory; |
| |
| arg = strdelim(&cp); |
| if (!arg || *arg == '\0') |
| fatal("%s line %d: missing file name.", |
| filename, linenum); |
| if (*activep && *charptr == NULL) |
| *charptr = 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 |
| load_server_config(const char *filename, Buffer *conf) |
| { |
| char line[1024], *cp; |
| FILE *f; |
| |
| debug2("%s: filename %s", __func__, filename); |
| if ((f = fopen(filename, "r")) == NULL) { |
| perror(filename); |
| exit(1); |
| } |
| buffer_clear(conf); |
| while (fgets(line, sizeof(line), f)) { |
| /* |
| * Trim out comments and strip whitespace |
| * NB - preserve newlines, they are needed to reproduce |
| * line numbers later for error messages |
| */ |
| if ((cp = strchr(line, '#')) != NULL) |
| memcpy(cp, "\n", 2); |
| cp = line + strspn(line, " \t\r"); |
| |
| buffer_append(conf, cp, strlen(cp)); |
| } |
| buffer_append(conf, "\0", 1); |
| fclose(f); |
| debug2("%s: done config len = %d", __func__, buffer_len(conf)); |
| } |
| |
| void |
| parse_server_match_config(ServerOptions *options, const char *user, |
| const char *host, const char *address) |
| { |
| ServerOptions mo; |
| |
| initialize_server_options(&mo); |
| parse_server_config(&mo, "reprocess config", &cfg, user, host, address); |
| copy_set_server_options(options, &mo, 0); |
| } |
| |
| /* Helper macros */ |
| #define M_CP_INTOPT(n) do {\ |
| if (src->n != -1) \ |
| dst->n = src->n; \ |
| } while (0) |
| #define M_CP_STROPT(n) do {\ |
| if (src->n != NULL) { \ |
| if (dst->n != NULL) \ |
| xfree(dst->n); \ |
| dst->n = src->n; \ |
| } \ |
| } while(0) |
| |
| /* |
| * Copy any supported values that are set. |
| * |
| * If the preauth flag is set, we do not bother copying the the string or |
| * array values that are not used pre-authentication, because any that we |
| * do use must be explictly sent in mm_getpwnamallow(). |
| */ |
| void |
| copy_set_server_options(ServerOptions *dst, ServerOptions *src, int preauth) |
| { |
| M_CP_INTOPT(password_authentication); |
| M_CP_INTOPT(gss_authentication); |
| M_CP_INTOPT(rsa_authentication); |
| M_CP_INTOPT(pubkey_authentication); |
| M_CP_INTOPT(kerberos_authentication); |
| M_CP_INTOPT(hostbased_authentication); |
| M_CP_INTOPT(kbd_interactive_authentication); |
| M_CP_INTOPT(permit_root_login); |
| |
| M_CP_INTOPT(allow_tcp_forwarding); |
| M_CP_INTOPT(allow_agent_forwarding); |
| M_CP_INTOPT(gateway_ports); |
| M_CP_INTOPT(x11_display_offset); |
| M_CP_INTOPT(x11_forwarding); |
| M_CP_INTOPT(x11_use_localhost); |
| |
| M_CP_STROPT(banner); |
| if (preauth) |
| return; |
| M_CP_STROPT(adm_forced_command); |
| M_CP_STROPT(chroot_directory); |
| } |
| |
| #undef M_CP_INTOPT |
| #undef M_CP_STROPT |
| |
| void |
| parse_server_config(ServerOptions *options, const char *filename, Buffer *conf, |
| const char *user, const char *host, const char *address) |
| { |
| int active, linenum, bad_options = 0; |
| char *cp, *obuf, *cbuf; |
| |
| debug2("%s: config %s len %d", __func__, filename, buffer_len(conf)); |
| |
| obuf = cbuf = xstrdup(buffer_ptr(conf)); |
| active = user ? 0 : 1; |
| linenum = 1; |
| while ((cp = strsep(&cbuf, "\n")) != NULL) { |
| if (process_server_config_line(options, cp, filename, |
| linenum++, &active, user, host, address) != 0) |
| bad_options++; |
| } |
| xfree(obuf); |
| if (bad_options > 0) |
| fatal("%s: terminating, %d bad configuration options", |
| filename, bad_options); |
| } |