Put ssh back into the repository
Change-Id: I23324372188fa6ed3f93a32b84365f5df6367590
diff --git a/servconf.c b/servconf.c
new file mode 100644
index 0000000..fb293f5
--- /dev/null
+++ b/servconf.c
@@ -0,0 +1,1811 @@
+/* $OpenBSD: servconf.c,v 1.222 2011/06/22 21:57:01 djm 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 <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"
+
+#ifdef ANDROID
+#include <cutils/properties.h>
+#endif
+
+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->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;
+}
+
+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_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_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->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;
+
+ /* 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
+
+}
+
+/* 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,
+ 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_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_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_GLOBAL },
+ { "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 },
+ { 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;
+}
+
+/*
+ * 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;
+}
+
+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) {
+ switch (addr_match_list(address, arg)) {
+ case 1:
+ debug("connection from %.100s matched 'Address "
+ "%.100s' at line %d", address, arg, line);
+ break;
+ case 0:
+ case -1:
+ result = 0;
+ break;
+ case -2:
+ return -1;
+ }
+ } 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"
+
+/* 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[] = {
+ { "sandbox", PRIVSEP_SANDBOX },
+ { "yes", PRIVSEP_ON },
+ { "no", PRIVSEP_OFF },
+ { NULL, -1 }
+};
+
+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, 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 (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:
+ 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;
+ goto parse_flag;
+
+ 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);
+ 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 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)
+ 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 = -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, 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 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 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;
+#ifdef ANDROID
+ char value[PROPERTY_VALUE_MAX];
+#endif
+
+ initialize_server_options(&mo);
+ parse_server_config(&mo, "reprocess config", &cfg, user, host, address);
+#ifdef ANDROID
+ /* Allow root login if ro.debuggable is set */
+ property_get("ro.debuggable", value, "");
+ if (strcmp(value, "1") == 0)
+ mo.permit_root_login = PERMIT_YES;
+#endif
+ 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)
+#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_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,
+ 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);
+}
+
+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 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);
+
+ /* 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);
+
+ /* 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();
+}