diff options
Diffstat (limited to 'crypto/openssh/servconf.c')
-rw-r--r-- | crypto/openssh/servconf.c | 2079 |
1 files changed, 2079 insertions, 0 deletions
diff --git a/crypto/openssh/servconf.c b/crypto/openssh/servconf.c new file mode 100644 index 0000000..ace75d3 --- /dev/null +++ b/crypto/openssh/servconf.c @@ -0,0 +1,2079 @@ + +/* $OpenBSD: servconf.c,v 1.234 2013/02/06 00:20:42 dtucker Exp $ */ +/* $FreeBSD$ */ +/* + * 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("$FreeBSD$"); + +#include <sys/types.h> +#include <sys/socket.h> + +#include <netinet/in.h> +#include <netinet/in_systm.h> +#include <netinet/ip.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 <errno.h> + +#include "openbsd-compat/sys-queue.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" +#include "canohost.h" +#include "packet.h" +#include "hostfile.h" +#include "auth.h" +#include "version.h" + +static void add_listen_addr(ServerOptions *, char *, int); +static void add_one_listen_addr(ServerOptions *, char *, int); + +/* 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->num_host_cert_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->kex_algorithms = 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->max_sessions = -1; + options->banner = NULL; + options->use_dns = -1; + options->client_alive_interval = -1; + options->client_alive_count_max = -1; + options->num_authkeys_files = 0; + options->num_accept_env = 0; + options->permit_tun = -1; + options->num_permitted_opens = -1; + options->adm_forced_command = NULL; + options->chroot_directory = NULL; + options->authorized_keys_command = NULL; + options->authorized_keys_command_user = NULL; + options->zero_knowledge_password_authentication = -1; + options->revoked_keys_file = NULL; + options->trusted_user_ca_keys = NULL; + options->authorized_principals_file = NULL; + options->ip_qos_interactive = -1; + options->ip_qos_bulk = -1; + options->version_addendum = NULL; + options->hpn_disabled = -1; + options->hpn_buffer_size = -1; + options->tcp_rcv_buf_poll = -1; +#ifdef NONE_CIPHER_ENABLED + options->none_enabled = -1; +#endif +} + +void +fill_default_server_options(ServerOptions *options) +{ + /* Portable-specific options */ + if (options->use_pam == -1) + options->use_pam = 1; + + /* Standard Options */ + if (options->protocol == SSH_PROTO_UNKNOWN) + options->protocol = 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; +#ifdef OPENSSL_HAS_ECC + options->host_key_files[options->num_host_key_files++] = + _PATH_HOST_ECDSA_KEY_FILE; +#endif + } + } + /* No certificates by default */ + 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 = 1024; + 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_NO; + 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 = 1; + 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 = 0; + 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 = FORWARD_ALLOW; + 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 = 100; + if (options->max_startups_rate == -1) + options->max_startups_rate = 30; /* 30% */ + if (options->max_startups_begin == -1) + options->max_startups_begin = 10; + if (options->max_authtries == -1) + options->max_authtries = DEFAULT_AUTH_FAIL_MAX; + if (options->max_sessions == -1) + options->max_sessions = DEFAULT_SESSIONS_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->num_authkeys_files == 0) { + options->authorized_keys_files[options->num_authkeys_files++] = + xstrdup(_PATH_SSH_USER_PERMITTED_KEYS); + options->authorized_keys_files[options->num_authkeys_files++] = + xstrdup(_PATH_SSH_USER_PERMITTED_KEYS2); + } + if (options->permit_tun == -1) + options->permit_tun = SSH_TUNMODE_NO; + if (options->zero_knowledge_password_authentication == -1) + options->zero_knowledge_password_authentication = 0; + if (options->ip_qos_interactive == -1) + options->ip_qos_interactive = IPTOS_LOWDELAY; + if (options->ip_qos_bulk == -1) + options->ip_qos_bulk = IPTOS_THROUGHPUT; + if (options->version_addendum == NULL) + options->version_addendum = xstrdup(SSH_VERSION_FREEBSD); + /* Turn privilege separation on by default */ + if (use_privsep == -1) + use_privsep = PRIVSEP_ON; + +#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 + + if (options->hpn_disabled == -1) + options->hpn_disabled = 0; + if (options->hpn_buffer_size == -1) { + /* + * HPN buffer size option not explicitly set. Try to figure + * out what value to use or resort to default. + */ + options->hpn_buffer_size = CHAN_SES_WINDOW_DEFAULT; + if (!options->hpn_disabled) { + sock_get_rcvbuf(&options->hpn_buffer_size, 0); + debug ("HPN Buffer Size: %d", options->hpn_buffer_size); + } + } else { + /* + * In the case that the user sets both values in a + * contradictory manner hpn_disabled overrrides hpn_buffer_size. + */ + if (options->hpn_disabled <= 0) { + u_int maxlen; + + maxlen = buffer_get_max_len(); + if (options->hpn_buffer_size == 0) + options->hpn_buffer_size = 1; + /* Limit the maximum buffer to BUFFER_MAX_LEN. */ + if (options->hpn_buffer_size > maxlen / 1024) + options->hpn_buffer_size = maxlen; + else + options->hpn_buffer_size *= 1024; + } else { + options->hpn_buffer_size = CHAN_TCP_WINDOW_DEFAULT; + } + } +} + +/* 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, sMaxSessions, + sBanner, sUseDNS, sHostbasedAuthentication, + sHostbasedUsesNameFromPacketOnly, sClientAliveInterval, + sClientAliveCountMax, sAuthorizedKeysFile, + sGssAuthentication, sGssCleanupCreds, sAcceptEnv, sPermitTunnel, + sMatch, sPermitOpen, sForceCommand, sChrootDirectory, + sUsePrivilegeSeparation, sAllowAgentForwarding, + sZeroKnowledgePasswordAuthentication, sHostCertificate, + sRevokedKeys, sTrustedUserCAKeys, sAuthorizedPrincipalsFile, + sKexAlgorithms, sIPQoS, sVersionAddendum, + sAuthorizedKeysCommand, sAuthorizedKeysCommandUser, + sAuthenticationMethods, + sHPNDisabled, sHPNBufferSize, sTcpRcvBufPoll, +#ifdef NONE_CIPHER_ENABLED + sNoneEnabled, +#endif + 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_ALL }, + { "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 */ +#ifdef JPAKE + { "zeroknowledgepasswordauthentication", sZeroKnowledgePasswordAuthentication, SSHCFG_ALL }, +#else + { "zeroknowledgepasswordauthentication", sUnsupported, SSHCFG_ALL }, +#endif + { "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_ALL }, + { "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_ALL }, + { "denyusers", sDenyUsers, SSHCFG_ALL }, + { "allowgroups", sAllowGroups, SSHCFG_ALL }, + { "denygroups", sDenyGroups, SSHCFG_ALL }, + { "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_ALL }, + { "maxsessions", sMaxSessions, SSHCFG_ALL }, + { "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_ALL }, + { "authorizedkeysfile2", sDeprecated, SSHCFG_ALL }, + { "useprivilegeseparation", sUsePrivilegeSeparation, SSHCFG_GLOBAL}, + { "acceptenv", sAcceptEnv, SSHCFG_ALL }, + { "permittunnel", sPermitTunnel, SSHCFG_ALL }, + { "match", sMatch, SSHCFG_ALL }, + { "permitopen", sPermitOpen, SSHCFG_ALL }, + { "forcecommand", sForceCommand, SSHCFG_ALL }, + { "chrootdirectory", sChrootDirectory, SSHCFG_ALL }, + { "hostcertificate", sHostCertificate, SSHCFG_GLOBAL }, + { "revokedkeys", sRevokedKeys, SSHCFG_ALL }, + { "trustedusercakeys", sTrustedUserCAKeys, SSHCFG_ALL }, + { "authorizedprincipalsfile", sAuthorizedPrincipalsFile, SSHCFG_ALL }, + { "kexalgorithms", sKexAlgorithms, SSHCFG_GLOBAL }, + { "ipqos", sIPQoS, SSHCFG_ALL }, + { "authorizedkeyscommand", sAuthorizedKeysCommand, SSHCFG_ALL }, + { "authorizedkeyscommanduser", sAuthorizedKeysCommandUser, SSHCFG_ALL }, + { "versionaddendum", sVersionAddendum, SSHCFG_GLOBAL }, + { "authenticationmethods", sAuthenticationMethods, SSHCFG_ALL }, + { "hpndisabled", sHPNDisabled, SSHCFG_ALL }, + { "hpnbuffersize", sHPNBufferSize, SSHCFG_ALL }, + { "tcprcvbufpoll", sTcpRcvBufPoll, SSHCFG_ALL }, +#ifdef NONE_CIPHER_ENABLED + { "noneenabled", sNoneEnabled, SSHCFG_ALL }, +#endif + { NULL, sBadOption, 0 } +}; + +static struct { + int val; + char *text; +} tunmode_desc[] = { + { SSH_TUNMODE_NO, "no" }, + { SSH_TUNMODE_POINTOPOINT, "point-to-point" }, + { SSH_TUNMODE_ETHERNET, "ethernet" }, + { SSH_TUNMODE_YES, "yes" }, + { -1, NULL } +}; + +/* + * 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; +} + +char * +derelativise_path(const char *path) +{ + char *expanded, *ret, cwd[MAXPATHLEN]; + + expanded = tilde_expand_filename(path, getuid()); + if (*expanded == '/') + return expanded; + if (getcwd(cwd, sizeof(cwd)) == NULL) + fatal("%s: getcwd: %s", __func__, strerror(errno)); + xasprintf(&ret, "%s/%s", cwd, expanded); + xfree(expanded); + return ret; +} + +static void +add_listen_addr(ServerOptions *options, char *addr, int 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, int 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, "%d", 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; +} + +struct connection_info * +get_connection_info(int populate, int use_dns) +{ + static struct connection_info ci; + + if (!populate) + return &ci; + ci.host = get_canonical_hostname(use_dns); + ci.address = get_remote_ipaddr(); + ci.laddress = get_local_ipaddr(packet_get_connection_in()); + ci.lport = get_local_port(); + return &ci; +} + +/* + * 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; + struct passwd *pw; + + 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_pattern_list(grps) != 1) { + debug("user %.100s does not match group list %.100s at line %d", + user, grps, line); + } else { + debug("user %.100s matched group list %.100s at line %d", user, + grps, line); + result = 1; + } +out: + ga_free(); + return result; +} + +/* + * All of the attributes on a single Match line are ANDed together, so we need + * to check every * attribute and set the result to zero if any attribute does + * not match. + */ +static int +match_cfg_line(char **condition, int line, struct connection_info *ci) +{ + int result = 1, port; + char *arg, *attrib, *cp = *condition; + size_t len; + + if (ci == NULL) + debug3("checking syntax for 'Match %s'", cp); + else + debug3("checking match for '%s' user %s host %s addr %s " + "laddr %s lport %d", cp, ci->user ? ci->user : "(null)", + ci->host ? ci->host : "(null)", + ci->address ? ci->address : "(null)", + ci->laddress ? ci->laddress : "(null)", ci->lport); + + 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 (ci == NULL || ci->user == NULL) { + result = 0; + continue; + } + if (match_pattern_list(ci->user, arg, len, 0) != 1) + result = 0; + else + debug("user %.100s matched 'User %.100s' at " + "line %d", ci->user, arg, line); + } else if (strcasecmp(attrib, "group") == 0) { + if (ci == NULL || ci->user == NULL) { + result = 0; + continue; + } + switch (match_cfg_line_group(arg, line, ci->user)) { + case -1: + return -1; + case 0: + result = 0; + } + } else if (strcasecmp(attrib, "host") == 0) { + if (ci == NULL || ci->host == NULL) { + result = 0; + continue; + } + if (match_hostname(ci->host, arg, len) != 1) + result = 0; + else + debug("connection from %.100s matched 'Host " + "%.100s' at line %d", ci->host, arg, line); + } else if (strcasecmp(attrib, "address") == 0) { + if (ci == NULL || ci->address == NULL) { + result = 0; + continue; + } + switch (addr_match_list(ci->address, arg)) { + case 1: + debug("connection from %.100s matched 'Address " + "%.100s' at line %d", ci->address, arg, line); + break; + case 0: + case -1: + result = 0; + break; + case -2: + return -1; + } + } else if (strcasecmp(attrib, "localaddress") == 0){ + if (ci == NULL || ci->laddress == NULL) { + result = 0; + continue; + } + switch (addr_match_list(ci->laddress, arg)) { + case 1: + debug("connection from %.100s matched " + "'LocalAddress %.100s' at line %d", + ci->laddress, arg, line); + break; + case 0: + case -1: + result = 0; + break; + case -2: + return -1; + } + } else if (strcasecmp(attrib, "localport") == 0) { + if ((port = a2port(arg)) == -1) { + error("Invalid LocalPort '%s' on Match line", + arg); + return -1; + } + if (ci == NULL || ci->lport == 0) { + result = 0; + continue; + } + /* TODO support port lists */ + if (port == ci->lport) + debug("connection from %.100s matched " + "'LocalPort %d' at line %d", + ci->laddress, port, line); + else + result = 0; + } else { + error("Unsupported Match attribute %s", attrib); + return -1; + } + } + if (ci != NULL) + debug3("match %sfound", result ? "" : "not "); + *condition = cp; + return result; +} + +#define WHITESPACE " \t\r\n" + +/* Multistate option parsing */ +struct multistate { + char *key; + int value; +}; +static const struct multistate multistate_addressfamily[] = { + { "inet", AF_INET }, + { "inet6", AF_INET6 }, + { "any", AF_UNSPEC }, + { NULL, -1 } +}; +static const struct multistate multistate_permitrootlogin[] = { + { "without-password", PERMIT_NO_PASSWD }, + { "forced-commands-only", PERMIT_FORCED_ONLY }, + { "yes", PERMIT_YES }, + { "no", PERMIT_NO }, + { NULL, -1 } +}; +static const struct multistate multistate_compression[] = { + { "delayed", COMP_DELAYED }, + { "yes", COMP_ZLIB }, + { "no", COMP_NONE }, + { NULL, -1 } +}; +static const struct multistate multistate_gatewayports[] = { + { "clientspecified", 2 }, + { "yes", 1 }, + { "no", 0 }, + { NULL, -1 } +}; +static const struct multistate multistate_privsep[] = { + { "yes", PRIVSEP_NOSANDBOX }, + { "sandbox", PRIVSEP_ON }, + { "nosandbox", PRIVSEP_NOSANDBOX }, + { "no", PRIVSEP_OFF }, + { NULL, -1 } +}; +static const struct multistate multistate_tcpfwd[] = { + { "yes", FORWARD_ALLOW }, + { "all", FORWARD_ALLOW }, + { "no", FORWARD_DENY }, + { "remote", FORWARD_REMOTE }, + { "local", FORWARD_LOCAL }, + { NULL, -1 } +}; + +int +process_server_config_line(ServerOptions *options, char *line, + const char *filename, int linenum, int *activep, + struct connection_info *connectinfo) +{ + char *cp, **charptr, *arg, *p; + int cmdline = 0, *intptr, value, value2, n; + SyslogFacility *log_facility_ptr; + LogLevel *log_level_ptr; + ServerOpCodes opcode; + int port; + u_int i, flags = 0; + size_t len; + const struct multistate *multistate_ptr; + + 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 (connectinfo == 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: + intptr = &options->address_family; + multistate_ptr = multistate_addressfamily; + if (options->listen_addrs != NULL) + fatal("%s line %d: address family must be specified " + "before ListenAddress.", filename, linenum); + parse_multistate: + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: missing argument.", + filename, linenum); + value = -1; + for (i = 0; multistate_ptr[i].key != NULL; i++) { + if (strcasecmp(arg, multistate_ptr[i].key) == 0) { + value = multistate_ptr[i].value; + break; + } + } + if (value == -1) + fatal("%s line %d: unsupported option \"%s\".", + filename, linenum, arg); + if (*activep && *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 = derelativise_path(arg); + /* increase optional counter */ + if (intptr != NULL) + *intptr = *intptr + 1; + } + break; + + case sHostCertificate: + intptr = &options->num_host_cert_files; + if (*intptr >= MAX_HOSTKEYS) + fatal("%s line %d: too many host certificates " + "specified (max %d).", filename, linenum, + MAX_HOSTCERTS); + charptr = &options->host_cert_files[*intptr]; + goto parse_filename; + break; + + case sPidFile: + charptr = &options->pid_file; + goto parse_filename; + + case sPermitRootLogin: + intptr = &options->permit_root_login; + multistate_ptr = multistate_permitrootlogin; + goto parse_multistate; + + 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 sZeroKnowledgePasswordAuthentication: + intptr = &options->zero_knowledge_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; + multistate_ptr = multistate_compression; + goto parse_multistate; + + case sGatewayPorts: + intptr = &options->gateway_ports; + multistate_ptr = multistate_gatewayports; + goto parse_multistate; + + 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; + multistate_ptr = multistate_tcpfwd; + goto parse_multistate; + + case sAllowAgentForwarding: + intptr = &options->allow_agent_forwarding; + goto parse_flag; + + case sUsePrivilegeSeparation: + intptr = &use_privsep; + multistate_ptr = multistate_privsep; + goto parse_multistate; + + 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); + if (!*activep) + continue; + 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); + if (!*activep) + continue; + 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); + if (!*activep) + continue; + 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); + if (!*activep) + continue; + 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 sKexAlgorithms: + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: Missing argument.", + filename, linenum); + if (!kex_names_valid(arg)) + fatal("%s line %d: Bad SSH2 KexAlgorithms '%s'.", + filename, linenum, arg ? arg : "<NONE>"); + if (options->kex_algorithms == NULL) + options->kex_algorithms = 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 sMaxSessions: + intptr = &options->max_sessions; + 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: + if (*activep && options->num_authkeys_files == 0) { + while ((arg = strdelim(&cp)) && *arg != '\0') { + if (options->num_authkeys_files >= + MAX_AUTHKEYS_FILES) + fatal("%s line %d: " + "too many authorized keys files.", + filename, linenum); + options->authorized_keys_files[ + options->num_authkeys_files++] = + tilde_expand_filename(arg, getuid()); + } + } + return 0; + + case sAuthorizedPrincipalsFile: + charptr = &options->authorized_principals_file; + 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 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) + continue; + 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 = -1; + for (i = 0; tunmode_desc[i].val != -1; i++) + if (strcmp(tunmode_desc[i].text, arg) == 0) { + value = tunmode_desc[i].val; + break; + } + if (value == -1) + 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, connectinfo); + 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 (strcmp(arg, "none") == 0) { + if (*activep && n == -1) { + options->num_permitted_opens = 1; + channel_disable_adm_local_opens(); + } + 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 = permitopen_port(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 sTrustedUserCAKeys: + charptr = &options->trusted_user_ca_keys; + goto parse_filename; + + case sRevokedKeys: + charptr = &options->revoked_keys_file; + goto parse_filename; + + case sIPQoS: + arg = strdelim(&cp); + if ((value = parse_ipqos(arg)) == -1) + fatal("%s line %d: Bad IPQoS value: %s", + filename, linenum, arg); + arg = strdelim(&cp); + if (arg == NULL) + value2 = value; + else if ((value2 = parse_ipqos(arg)) == -1) + fatal("%s line %d: Bad IPQoS value: %s", + filename, linenum, arg); + if (*activep) { + options->ip_qos_interactive = value; + options->ip_qos_bulk = value2; + } + break; + + case sVersionAddendum: + if (cp == NULL) + fatal("%.200s line %d: Missing argument.", filename, + linenum); + len = strspn(cp, WHITESPACE); + if (*activep && options->version_addendum == NULL) { + if (strcasecmp(cp + len, "none") == 0) + options->version_addendum = xstrdup(""); + else if (strchr(cp + len, '\r') != NULL) + fatal("%.200s line %d: Invalid argument", + filename, linenum); + else + options->version_addendum = xstrdup(cp + len); + } + return 0; + + case sAuthorizedKeysCommand: + len = strspn(cp, WHITESPACE); + if (*activep && options->authorized_keys_command == NULL) { + if (cp[len] != '/' && strcasecmp(cp + len, "none") != 0) + fatal("%.200s line %d: AuthorizedKeysCommand " + "must be an absolute path", + filename, linenum); + options->authorized_keys_command = xstrdup(cp + len); + } + return 0; + + case sAuthorizedKeysCommandUser: + charptr = &options->authorized_keys_command_user; + + arg = strdelim(&cp); + if (*activep && *charptr == NULL) + *charptr = xstrdup(arg); + break; + + case sAuthenticationMethods: + if (*activep && options->num_auth_methods == 0) { + while ((arg = strdelim(&cp)) && *arg != '\0') { + if (options->num_auth_methods >= + MAX_AUTH_METHODS) + fatal("%s line %d: " + "too many authentication methods.", + filename, linenum); + if (auth2_methods_valid(arg, 0) != 0) + fatal("%s line %d: invalid " + "authentication method list.", + filename, linenum); + options->auth_methods[ + options->num_auth_methods++] = xstrdup(arg); + } + } + return 0; + + case sHPNDisabled: + intptr = &options->hpn_disabled; + goto parse_flag; + + case sHPNBufferSize: + intptr = &options->hpn_buffer_size; + goto parse_int; + + case sTcpRcvBufPoll: + intptr = &options->tcp_rcv_buf_poll; + goto parse_flag; + +#ifdef NONE_CIPHER_ENABLED + case sNoneEnabled: + intptr = &options->none_enabled; + goto parse_flag; +#endif + + 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[4096], *cp; + FILE *f; + int lineno = 0; + + 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)) { + lineno++; + if (strlen(line) == sizeof(line) - 1) + fatal("%s line %d too long", filename, lineno); + /* + * 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, + struct connection_info *connectinfo) +{ + ServerOptions mo; + + initialize_server_options(&mo); + parse_server_config(&mo, "reprocess config", &cfg, connectinfo); + copy_set_server_options(options, &mo, 0); +} + +int parse_server_match_testspec(struct connection_info *ci, char *spec) +{ + char *p; + + while ((p = strsep(&spec, ",")) && *p != '\0') { + if (strncmp(p, "addr=", 5) == 0) { + ci->address = xstrdup(p + 5); + } else if (strncmp(p, "host=", 5) == 0) { + ci->host = xstrdup(p + 5); + } else if (strncmp(p, "user=", 5) == 0) { + ci->user = xstrdup(p + 5); + } else if (strncmp(p, "laddr=", 6) == 0) { + ci->laddress = xstrdup(p + 6); + } else if (strncmp(p, "lport=", 6) == 0) { + ci->lport = a2port(p + 6); + if (ci->lport == -1) { + fprintf(stderr, "Invalid port '%s' in test mode" + " specification %s\n", p+6, p); + return -1; + } + } else { + fprintf(stderr, "Invalid test mode specification %s\n", + p); + return -1; + } + } + return 0; +} + +/* + * returns 1 for a complete spec, 0 for partial spec and -1 for an + * empty spec. + */ +int server_match_spec_complete(struct connection_info *ci) +{ + if (ci->user && ci->host && ci->address) + return 1; /* complete */ + if (!ci->user && !ci->host && !ci->address) + return -1; /* empty */ + return 0; /* partial */ +} + +/* 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) +#define M_CP_STRARRAYOPT(n, num_n) do {\ + if (src->num_n != 0) { \ + for (dst->num_n = 0; dst->num_n < src->num_n; dst->num_n++) \ + dst->n[dst->num_n] = xstrdup(src->n[dst->num_n]); \ + } \ +} while(0) + +/* + * Copy any supported values that are set. + * + * If the preauth flag is set, we do not bother copying 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(hostbased_uses_name_from_packet_only); + M_CP_INTOPT(kbd_interactive_authentication); + M_CP_INTOPT(zero_knowledge_password_authentication); + M_CP_STROPT(authorized_keys_command); + M_CP_STROPT(authorized_keys_command_user); + M_CP_INTOPT(permit_root_login); + M_CP_INTOPT(permit_empty_passwd); + + M_CP_INTOPT(allow_tcp_forwarding); + M_CP_INTOPT(allow_agent_forwarding); + M_CP_INTOPT(permit_tun); + M_CP_INTOPT(gateway_ports); + M_CP_INTOPT(x11_display_offset); + M_CP_INTOPT(x11_forwarding); + M_CP_INTOPT(x11_use_localhost); + M_CP_INTOPT(max_sessions); + M_CP_INTOPT(max_authtries); + M_CP_INTOPT(ip_qos_interactive); + M_CP_INTOPT(ip_qos_bulk); + + /* See comment in servconf.h */ + COPY_MATCH_STRING_OPTS(); + + /* + * The only things that should be below this point are string options + * which are only used after authentication. + */ + if (preauth) + return; + + M_CP_STROPT(adm_forced_command); + M_CP_STROPT(chroot_directory); +} + +#undef M_CP_INTOPT +#undef M_CP_STROPT +#undef M_CP_STRARRAYOPT + +void +parse_server_config(ServerOptions *options, const char *filename, Buffer *conf, + struct connection_info *connectinfo) +{ + 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 = connectinfo ? 0 : 1; + linenum = 1; + while ((cp = strsep(&cbuf, "\n")) != NULL) { + if (process_server_config_line(options, cp, filename, + linenum++, &active, connectinfo) != 0) + bad_options++; + } + xfree(obuf); + if (bad_options > 0) + fatal("%s: terminating, %d bad configuration options", + filename, bad_options); +} + +static const char * +fmt_multistate_int(int val, const struct multistate *m) +{ + u_int i; + + for (i = 0; m[i].key != NULL; i++) { + if (m[i].value == val) + return m[i].key; + } + return "UNKNOWN"; +} + +static const char * +fmt_intarg(ServerOpCodes code, int val) +{ + if (val == -1) + return "unset"; + switch (code) { + case sAddressFamily: + return fmt_multistate_int(val, multistate_addressfamily); + case sPermitRootLogin: + return fmt_multistate_int(val, multistate_permitrootlogin); + case sGatewayPorts: + return fmt_multistate_int(val, multistate_gatewayports); + case sCompression: + return fmt_multistate_int(val, multistate_compression); + case sUsePrivilegeSeparation: + return fmt_multistate_int(val, multistate_privsep); + case sAllowTcpForwarding: + return fmt_multistate_int(val, multistate_tcpfwd); + case sProtocol: + switch (val) { + case SSH_PROTO_1: + return "1"; + case SSH_PROTO_2: + return "2"; + case (SSH_PROTO_1|SSH_PROTO_2): + return "2,1"; + default: + return "UNKNOWN"; + } + default: + switch (val) { + case 0: + return "no"; + case 1: + return "yes"; + default: + return "UNKNOWN"; + } + } +} + +static const char * +lookup_opcode_name(ServerOpCodes code) +{ + u_int i; + + for (i = 0; keywords[i].name != NULL; i++) + if (keywords[i].opcode == code) + return(keywords[i].name); + return "UNKNOWN"; +} + +static void +dump_cfg_int(ServerOpCodes code, int val) +{ + printf("%s %d\n", lookup_opcode_name(code), val); +} + +static void +dump_cfg_fmtint(ServerOpCodes code, int val) +{ + printf("%s %s\n", lookup_opcode_name(code), fmt_intarg(code, val)); +} + +static void +dump_cfg_string(ServerOpCodes code, const char *val) +{ + if (val == NULL) + return; + printf("%s %s\n", lookup_opcode_name(code), val); +} + +static void +dump_cfg_strarray(ServerOpCodes code, u_int count, char **vals) +{ + u_int i; + + for (i = 0; i < count; i++) + printf("%s %s\n", lookup_opcode_name(code), vals[i]); +} + +static void +dump_cfg_strarray_oneline(ServerOpCodes code, u_int count, char **vals) +{ + u_int i; + + printf("%s", lookup_opcode_name(code)); + for (i = 0; i < count; i++) + printf(" %s", vals[i]); + printf("\n"); +} + +void +dump_config(ServerOptions *o) +{ + u_int i; + int ret; + struct addrinfo *ai; + char addr[NI_MAXHOST], port[NI_MAXSERV], *s = NULL; + + /* these are usually at the top of the config */ + for (i = 0; i < o->num_ports; i++) + printf("port %d\n", o->ports[i]); + dump_cfg_fmtint(sProtocol, o->protocol); + dump_cfg_fmtint(sAddressFamily, o->address_family); + + /* ListenAddress must be after Port */ + for (ai = o->listen_addrs; ai; ai = ai->ai_next) { + if ((ret = getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, + sizeof(addr), port, sizeof(port), + NI_NUMERICHOST|NI_NUMERICSERV)) != 0) { + error("getnameinfo failed: %.100s", + (ret != EAI_SYSTEM) ? gai_strerror(ret) : + strerror(errno)); + } else { + if (ai->ai_family == AF_INET6) + printf("listenaddress [%s]:%s\n", addr, port); + else + printf("listenaddress %s:%s\n", addr, port); + } + } + + /* integer arguments */ +#ifdef USE_PAM + dump_cfg_int(sUsePAM, o->use_pam); +#endif + dump_cfg_int(sServerKeyBits, o->server_key_bits); + dump_cfg_int(sLoginGraceTime, o->login_grace_time); + dump_cfg_int(sKeyRegenerationTime, o->key_regeneration_time); + dump_cfg_int(sX11DisplayOffset, o->x11_display_offset); + dump_cfg_int(sMaxAuthTries, o->max_authtries); + dump_cfg_int(sMaxSessions, o->max_sessions); + dump_cfg_int(sClientAliveInterval, o->client_alive_interval); + dump_cfg_int(sClientAliveCountMax, o->client_alive_count_max); + + /* formatted integer arguments */ + dump_cfg_fmtint(sPermitRootLogin, o->permit_root_login); + dump_cfg_fmtint(sIgnoreRhosts, o->ignore_rhosts); + dump_cfg_fmtint(sIgnoreUserKnownHosts, o->ignore_user_known_hosts); + dump_cfg_fmtint(sRhostsRSAAuthentication, o->rhosts_rsa_authentication); + dump_cfg_fmtint(sHostbasedAuthentication, o->hostbased_authentication); + dump_cfg_fmtint(sHostbasedUsesNameFromPacketOnly, + o->hostbased_uses_name_from_packet_only); + dump_cfg_fmtint(sRSAAuthentication, o->rsa_authentication); + dump_cfg_fmtint(sPubkeyAuthentication, o->pubkey_authentication); +#ifdef KRB5 + dump_cfg_fmtint(sKerberosAuthentication, o->kerberos_authentication); + dump_cfg_fmtint(sKerberosOrLocalPasswd, o->kerberos_or_local_passwd); + dump_cfg_fmtint(sKerberosTicketCleanup, o->kerberos_ticket_cleanup); +# ifdef USE_AFS + dump_cfg_fmtint(sKerberosGetAFSToken, o->kerberos_get_afs_token); +# endif +#endif +#ifdef GSSAPI + dump_cfg_fmtint(sGssAuthentication, o->gss_authentication); + dump_cfg_fmtint(sGssCleanupCreds, o->gss_cleanup_creds); +#endif +#ifdef JPAKE + dump_cfg_fmtint(sZeroKnowledgePasswordAuthentication, + o->zero_knowledge_password_authentication); +#endif + dump_cfg_fmtint(sPasswordAuthentication, o->password_authentication); + dump_cfg_fmtint(sKbdInteractiveAuthentication, + o->kbd_interactive_authentication); + dump_cfg_fmtint(sChallengeResponseAuthentication, + o->challenge_response_authentication); + dump_cfg_fmtint(sPrintMotd, o->print_motd); + dump_cfg_fmtint(sPrintLastLog, o->print_lastlog); + dump_cfg_fmtint(sX11Forwarding, o->x11_forwarding); + dump_cfg_fmtint(sX11UseLocalhost, o->x11_use_localhost); + dump_cfg_fmtint(sStrictModes, o->strict_modes); + dump_cfg_fmtint(sTCPKeepAlive, o->tcp_keep_alive); + dump_cfg_fmtint(sEmptyPasswd, o->permit_empty_passwd); + dump_cfg_fmtint(sPermitUserEnvironment, o->permit_user_env); + dump_cfg_fmtint(sUseLogin, o->use_login); + dump_cfg_fmtint(sCompression, o->compression); + dump_cfg_fmtint(sGatewayPorts, o->gateway_ports); + dump_cfg_fmtint(sUseDNS, o->use_dns); + dump_cfg_fmtint(sAllowTcpForwarding, o->allow_tcp_forwarding); + dump_cfg_fmtint(sUsePrivilegeSeparation, use_privsep); + + /* string arguments */ + dump_cfg_string(sPidFile, o->pid_file); + dump_cfg_string(sXAuthLocation, o->xauth_location); + dump_cfg_string(sCiphers, o->ciphers); + dump_cfg_string(sMacs, o->macs); + dump_cfg_string(sBanner, o->banner); + dump_cfg_string(sForceCommand, o->adm_forced_command); + dump_cfg_string(sChrootDirectory, o->chroot_directory); + dump_cfg_string(sTrustedUserCAKeys, o->trusted_user_ca_keys); + dump_cfg_string(sRevokedKeys, o->revoked_keys_file); + dump_cfg_string(sAuthorizedPrincipalsFile, + o->authorized_principals_file); + dump_cfg_string(sVersionAddendum, o->version_addendum); + dump_cfg_string(sAuthorizedKeysCommand, o->authorized_keys_command); + dump_cfg_string(sAuthorizedKeysCommandUser, o->authorized_keys_command_user); + + /* string arguments requiring a lookup */ + dump_cfg_string(sLogLevel, log_level_name(o->log_level)); + dump_cfg_string(sLogFacility, log_facility_name(o->log_facility)); + + /* string array arguments */ + dump_cfg_strarray_oneline(sAuthorizedKeysFile, o->num_authkeys_files, + o->authorized_keys_files); + dump_cfg_strarray(sHostKeyFile, o->num_host_key_files, + o->host_key_files); + dump_cfg_strarray(sHostKeyFile, o->num_host_cert_files, + o->host_cert_files); + dump_cfg_strarray(sAllowUsers, o->num_allow_users, o->allow_users); + dump_cfg_strarray(sDenyUsers, o->num_deny_users, o->deny_users); + dump_cfg_strarray(sAllowGroups, o->num_allow_groups, o->allow_groups); + dump_cfg_strarray(sDenyGroups, o->num_deny_groups, o->deny_groups); + dump_cfg_strarray(sAcceptEnv, o->num_accept_env, o->accept_env); + dump_cfg_strarray_oneline(sAuthenticationMethods, + o->num_auth_methods, o->auth_methods); + + /* other arguments */ + for (i = 0; i < o->num_subsystems; i++) + printf("subsystem %s %s\n", o->subsystem_name[i], + o->subsystem_args[i]); + + printf("maxstartups %d:%d:%d\n", o->max_startups_begin, + o->max_startups_rate, o->max_startups); + + for (i = 0; tunmode_desc[i].val != -1; i++) + if (tunmode_desc[i].val == o->permit_tun) { + s = tunmode_desc[i].text; + break; + } + dump_cfg_string(sPermitTunnel, s); + + printf("ipqos %s ", iptos2str(o->ip_qos_interactive)); + printf("%s\n", iptos2str(o->ip_qos_bulk)); + + channel_print_adm_permitted_opens(); +} |