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openssh/servconf.c
naddy@openbsd.org 91a2135f32 upstream: Allow prepending a list of algorithms to the default set 
by starting the list with the '^' character, e.g.

HostKeyAlgorithms ^ssh-ed25519
Ciphers ^aes128-gcm@openssh.com,aes256-gcm@openssh.com

ok djm@ dtucker@

OpenBSD-Commit-ID: 1e1996fac0dc8a4b0d0ff58395135848287f6f97
2019-09-08 14:49:04 +10:00

2715 lines
80 KiB
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/* $OpenBSD: servconf.c,v 1.352 2019/09/06 14:45:34 naddy 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>
#ifdef HAVE_SYS_SYSCTL_H
#include <sys/sysctl.h>
#endif
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#ifdef HAVE_NET_ROUTE_H
#include <net/route.h>
#endif
#include <ctype.h>
#include <netdb.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <unistd.h>
#include <limits.h>
#include <stdarg.h>
#include <errno.h>
#ifdef HAVE_UTIL_H
#include <util.h>
#endif
#include "openbsd-compat/sys-queue.h"
#include "xmalloc.h"
#include "ssh.h"
#include "log.h"
#include "sshbuf.h"
#include "misc.h"
#include "servconf.h"
#include "compat.h"
#include "pathnames.h"
#include "cipher.h"
#include "sshkey.h"
#include "kex.h"
#include "mac.h"
#include "match.h"
#include "channels.h"
#include "groupaccess.h"
#include "canohost.h"
#include "packet.h"
#include "ssherr.h"
#include "hostfile.h"
#include "auth.h"
#include "myproposal.h"
#include "digest.h"
static void add_listen_addr(ServerOptions *, const char *,
const char *, int);
static void add_one_listen_addr(ServerOptions *, const char *,
const char *, int);
/* Use of privilege separation or not */
extern int use_privsep;
extern struct sshbuf *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->queued_listen_addrs = NULL;
options->num_queued_listens = 0;
options->listen_addrs = NULL;
options->num_listen_addrs = 0;
options->address_family = -1;
options->routing_domain = NULL;
options->num_host_key_files = 0;
options->num_host_cert_files = 0;
options->host_key_agent = NULL;
options->pid_file = NULL;
options->login_grace_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->permit_tty = -1;
options->permit_user_rc = -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->hostbased_authentication = -1;
options->hostbased_uses_name_from_packet_only = -1;
options->hostbased_key_types = NULL;
options->hostkeyalgorithms = NULL;
options->pubkey_authentication = -1;
options->pubkey_key_types = NULL;
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->gss_strict_acceptor = -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->permit_user_env_whitelist = NULL;
options->compression = -1;
options->rekey_limit = -1;
options->rekey_interval = -1;
options->allow_tcp_forwarding = -1;
options->allow_streamlocal_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->ca_sign_algorithms = NULL;
options->fwd_opts.gateway_ports = -1;
options->fwd_opts.streamlocal_bind_mask = (mode_t)-1;
options->fwd_opts.streamlocal_bind_unlink = -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->num_setenv = 0;
options->permit_tun = -1;
options->permitted_opens = NULL;
options->permitted_listens = NULL;
options->adm_forced_command = NULL;
options->chroot_directory = NULL;
options->authorized_keys_command = NULL;
options->authorized_keys_command_user = NULL;
options->revoked_keys_file = NULL;
options->trusted_user_ca_keys = NULL;
options->authorized_principals_file = NULL;
options->authorized_principals_command = NULL;
options->authorized_principals_command_user = NULL;
options->ip_qos_interactive = -1;
options->ip_qos_bulk = -1;
options->version_addendum = NULL;
options->fingerprint_hash = -1;
options->disable_forwarding = -1;
options->expose_userauth_info = -1;
}
/* Returns 1 if a string option is unset or set to "none" or 0 otherwise. */
static int
option_clear_or_none(const char *o)
{
return o == NULL || strcasecmp(o, "none") == 0;
}
static void
assemble_algorithms(ServerOptions *o)
{
char *all_cipher, *all_mac, *all_kex, *all_key, *all_sig;
int r;
all_cipher = cipher_alg_list(',', 0);
all_mac = mac_alg_list(',');
all_kex = kex_alg_list(',');
all_key = sshkey_alg_list(0, 0, 1, ',');
all_sig = sshkey_alg_list(0, 1, 1, ',');
#define ASSEMBLE(what, defaults, all) \
do { \
if ((r = kex_assemble_names(&o->what, defaults, all)) != 0) \
fatal("%s: %s: %s", __func__, #what, ssh_err(r)); \
} while (0)
ASSEMBLE(ciphers, KEX_SERVER_ENCRYPT, all_cipher);
ASSEMBLE(macs, KEX_SERVER_MAC, all_mac);
ASSEMBLE(kex_algorithms, KEX_SERVER_KEX, all_kex);
ASSEMBLE(hostkeyalgorithms, KEX_DEFAULT_PK_ALG, all_key);
ASSEMBLE(hostbased_key_types, KEX_DEFAULT_PK_ALG, all_key);
ASSEMBLE(pubkey_key_types, KEX_DEFAULT_PK_ALG, all_key);
ASSEMBLE(ca_sign_algorithms, SSH_ALLOWED_CA_SIGALGS, all_sig);
#undef ASSEMBLE
free(all_cipher);
free(all_mac);
free(all_kex);
free(all_key);
free(all_sig);
}
static void
array_append2(const char *file, const int line, const char *directive,
char ***array, int **iarray, u_int *lp, const char *s, int i)
{
if (*lp >= INT_MAX)
fatal("%s line %d: Too many %s entries", file, line, directive);
if (iarray != NULL) {
*iarray = xrecallocarray(*iarray, *lp, *lp + 1,
sizeof(**iarray));
(*iarray)[*lp] = i;
}
*array = xrecallocarray(*array, *lp, *lp + 1, sizeof(**array));
(*array)[*lp] = xstrdup(s);
(*lp)++;
}
static void
array_append(const char *file, const int line, const char *directive,
char ***array, u_int *lp, const char *s)
{
array_append2(file, line, directive, array, NULL, lp, s, 0);
}
void
servconf_add_hostkey(const char *file, const int line,
ServerOptions *options, const char *path, int userprovided)
{
char *apath = derelativise_path(path);
array_append2(file, line, "HostKey",
&options->host_key_files, &options->host_key_file_userprovided,
&options->num_host_key_files, apath, userprovided);
free(apath);
}
void
servconf_add_hostcert(const char *file, const int line,
ServerOptions *options, const char *path)
{
char *apath = derelativise_path(path);
array_append(file, line, "HostCertificate",
&options->host_cert_files, &options->num_host_cert_files, apath);
free(apath);
}
void
fill_default_server_options(ServerOptions *options)
{
u_int i;
/* Portable-specific options */
if (options->use_pam == -1)
options->use_pam = 0;
/* Standard Options */
if (options->num_host_key_files == 0) {
/* fill default hostkeys for protocols */
servconf_add_hostkey("[default]", 0, options,
_PATH_HOST_RSA_KEY_FILE, 0);
#ifdef OPENSSL_HAS_ECC
servconf_add_hostkey("[default]", 0, options,
_PATH_HOST_ECDSA_KEY_FILE, 0);
#endif
servconf_add_hostkey("[default]", 0, options,
_PATH_HOST_ED25519_KEY_FILE, 0);
#ifdef WITH_XMSS
servconf_add_hostkey("[default]", 0, options,
_PATH_HOST_XMSS_KEY_FILE, 0);
#endif /* WITH_XMSS */
}
/* No certificates by default */
if (options->num_ports == 0)
options->ports[options->num_ports++] = SSH_DEFAULT_PORT;
if (options->address_family == -1)
options->address_family = AF_UNSPEC;
if (options->listen_addrs == NULL)
add_listen_addr(options, NULL, NULL, 0);
if (options->pid_file == NULL)
options->pid_file = xstrdup(_PATH_SSH_DAEMON_PID_FILE);
if (options->login_grace_time == -1)
options->login_grace_time = 120;
if (options->permit_root_login == PERMIT_NOT_SET)
options->permit_root_login = PERMIT_NO_PASSWD;
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 = xstrdup(_PATH_XAUTH);
if (options->permit_tty == -1)
options->permit_tty = 1;
if (options->permit_user_rc == -1)
options->permit_user_rc = 1;
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->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->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->gss_strict_acceptor == -1)
options->gss_strict_acceptor = 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;
options->permit_user_env_whitelist = NULL;
}
if (options->compression == -1)
options->compression = COMP_DELAYED;
if (options->rekey_limit == -1)
options->rekey_limit = 0;
if (options->rekey_interval == -1)
options->rekey_interval = 0;
if (options->allow_tcp_forwarding == -1)
options->allow_tcp_forwarding = FORWARD_ALLOW;
if (options->allow_streamlocal_forwarding == -1)
options->allow_streamlocal_forwarding = FORWARD_ALLOW;
if (options->allow_agent_forwarding == -1)
options->allow_agent_forwarding = 1;
if (options->fwd_opts.gateway_ports == -1)
options->fwd_opts.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 = 0;
if (options->client_alive_interval == -1)
options->client_alive_interval = 0;
if (options->client_alive_count_max == -1)
options->client_alive_count_max = 3;
if (options->num_authkeys_files == 0) {
array_append("[default]", 0, "AuthorizedKeysFiles",
&options->authorized_keys_files,
&options->num_authkeys_files,
_PATH_SSH_USER_PERMITTED_KEYS);
array_append("[default]", 0, "AuthorizedKeysFiles",
&options->authorized_keys_files,
&options->num_authkeys_files,
_PATH_SSH_USER_PERMITTED_KEYS2);
}
if (options->permit_tun == -1)
options->permit_tun = SSH_TUNMODE_NO;
if (options->ip_qos_interactive == -1)
options->ip_qos_interactive = IPTOS_DSCP_AF21;
if (options->ip_qos_bulk == -1)
options->ip_qos_bulk = IPTOS_DSCP_CS1;
if (options->version_addendum == NULL)
options->version_addendum = xstrdup("");
if (options->fwd_opts.streamlocal_bind_mask == (mode_t)-1)
options->fwd_opts.streamlocal_bind_mask = 0177;
if (options->fwd_opts.streamlocal_bind_unlink == -1)
options->fwd_opts.streamlocal_bind_unlink = 0;
if (options->fingerprint_hash == -1)
options->fingerprint_hash = SSH_FP_HASH_DEFAULT;
if (options->disable_forwarding == -1)
options->disable_forwarding = 0;
if (options->expose_userauth_info == -1)
options->expose_userauth_info = 0;
assemble_algorithms(options);
/* Turn privilege separation and sandboxing on by default */
if (use_privsep == -1)
use_privsep = PRIVSEP_ON;
#define CLEAR_ON_NONE(v) \
do { \
if (option_clear_or_none(v)) { \
free(v); \
v = NULL; \
} \
} while(0)
CLEAR_ON_NONE(options->pid_file);
CLEAR_ON_NONE(options->xauth_location);
CLEAR_ON_NONE(options->banner);
CLEAR_ON_NONE(options->trusted_user_ca_keys);
CLEAR_ON_NONE(options->revoked_keys_file);
CLEAR_ON_NONE(options->authorized_principals_file);
CLEAR_ON_NONE(options->adm_forced_command);
CLEAR_ON_NONE(options->chroot_directory);
CLEAR_ON_NONE(options->routing_domain);
for (i = 0; i < options->num_host_key_files; i++)
CLEAR_ON_NONE(options->host_key_files[i]);
for (i = 0; i < options->num_host_cert_files; i++)
CLEAR_ON_NONE(options->host_cert_files[i]);
#undef CLEAR_ON_NONE
/* Similar handling for AuthenticationMethods=any */
if (options->num_auth_methods == 1 &&
strcmp(options->auth_methods[0], "any") == 0) {
free(options->auth_methods[0]);
options->auth_methods[0] = NULL;
options->num_auth_methods = 0;
}
#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, sLoginGraceTime,
sPermitRootLogin, sLogFacility, sLogLevel,
sRhostsRSAAuthentication, sRSAAuthentication,
sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup,
sKerberosGetAFSToken, sChallengeResponseAuthentication,
sPasswordAuthentication, sKbdInteractiveAuthentication,
sListenAddress, sAddressFamily,
sPrintMotd, sPrintLastLog, sIgnoreRhosts,
sX11Forwarding, sX11DisplayOffset, sX11UseLocalhost,
sPermitTTY, sStrictModes, sEmptyPasswd, sTCPKeepAlive,
sPermitUserEnvironment, sAllowTcpForwarding, sCompression,
sRekeyLimit, sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups,
sIgnoreUserKnownHosts, sCiphers, sMacs, sPidFile,
sGatewayPorts, sPubkeyAuthentication, sPubkeyAcceptedKeyTypes,
sXAuthLocation, sSubsystem, sMaxStartups, sMaxAuthTries, sMaxSessions,
sBanner, sUseDNS, sHostbasedAuthentication,
sHostbasedUsesNameFromPacketOnly, sHostbasedAcceptedKeyTypes,
sHostKeyAlgorithms,
sClientAliveInterval, sClientAliveCountMax, sAuthorizedKeysFile,
sGssAuthentication, sGssCleanupCreds, sGssStrictAcceptor,
sAcceptEnv, sSetEnv, sPermitTunnel,
sMatch, sPermitOpen, sPermitListen, sForceCommand, sChrootDirectory,
sUsePrivilegeSeparation, sAllowAgentForwarding,
sHostCertificate,
sRevokedKeys, sTrustedUserCAKeys, sAuthorizedPrincipalsFile,
sAuthorizedPrincipalsCommand, sAuthorizedPrincipalsCommandUser,
sKexAlgorithms, sCASignatureAlgorithms, sIPQoS, sVersionAddendum,
sAuthorizedKeysCommand, sAuthorizedKeysCommandUser,
sAuthenticationMethods, sHostKeyAgent, sPermitUserRC,
sStreamLocalBindMask, sStreamLocalBindUnlink,
sAllowStreamLocalForwarding, sFingerprintHash, sDisableForwarding,
sExposeAuthInfo, sRDomain,
sDeprecated, sIgnore, 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 */
{ "hostkeyagent", sHostKeyAgent, SSHCFG_GLOBAL },
{ "pidfile", sPidFile, SSHCFG_GLOBAL },
{ "serverkeybits", sDeprecated, SSHCFG_GLOBAL },
{ "logingracetime", sLoginGraceTime, SSHCFG_GLOBAL },
{ "keyregenerationinterval", sDeprecated, SSHCFG_GLOBAL },
{ "permitrootlogin", sPermitRootLogin, SSHCFG_ALL },
{ "syslogfacility", sLogFacility, SSHCFG_GLOBAL },
{ "loglevel", sLogLevel, SSHCFG_ALL },
{ "rhostsauthentication", sDeprecated, SSHCFG_GLOBAL },
{ "rhostsrsaauthentication", sDeprecated, SSHCFG_ALL },
{ "hostbasedauthentication", sHostbasedAuthentication, SSHCFG_ALL },
{ "hostbasedusesnamefrompacketonly", sHostbasedUsesNameFromPacketOnly, SSHCFG_ALL },
{ "hostbasedacceptedkeytypes", sHostbasedAcceptedKeyTypes, SSHCFG_ALL },
{ "hostkeyalgorithms", sHostKeyAlgorithms, SSHCFG_GLOBAL },
{ "rsaauthentication", sDeprecated, SSHCFG_ALL },
{ "pubkeyauthentication", sPubkeyAuthentication, SSHCFG_ALL },
{ "pubkeyacceptedkeytypes", sPubkeyAcceptedKeyTypes, 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 },
{ "gssapistrictacceptorcheck", sGssStrictAcceptor, SSHCFG_GLOBAL },
#else
{ "gssapiauthentication", sUnsupported, SSHCFG_ALL },
{ "gssapicleanupcredentials", sUnsupported, SSHCFG_GLOBAL },
{ "gssapistrictacceptorcheck", sUnsupported, SSHCFG_GLOBAL },
#endif
{ "passwordauthentication", sPasswordAuthentication, SSHCFG_ALL },
{ "kbdinteractiveauthentication", sKbdInteractiveAuthentication, SSHCFG_ALL },
{ "challengeresponseauthentication", sChallengeResponseAuthentication, SSHCFG_GLOBAL },
{ "skeyauthentication", sDeprecated, SSHCFG_GLOBAL },
{ "checkmail", sDeprecated, SSHCFG_GLOBAL },
{ "listenaddress", sListenAddress, SSHCFG_GLOBAL },
{ "addressfamily", sAddressFamily, SSHCFG_GLOBAL },
{ "printmotd", sPrintMotd, SSHCFG_GLOBAL },
#ifdef DISABLE_LASTLOG
{ "printlastlog", sUnsupported, SSHCFG_GLOBAL },
#else
{ "printlastlog", sPrintLastLog, SSHCFG_GLOBAL },
#endif
{ "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", sDeprecated, SSHCFG_GLOBAL },
{ "compression", sCompression, SSHCFG_GLOBAL },
{ "rekeylimit", sRekeyLimit, SSHCFG_ALL },
{ "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", sIgnore, 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_ALL },
{ "clientalivecountmax", sClientAliveCountMax, SSHCFG_ALL },
{ "authorizedkeysfile", sAuthorizedKeysFile, SSHCFG_ALL },
{ "authorizedkeysfile2", sDeprecated, SSHCFG_ALL },
{ "useprivilegeseparation", sDeprecated, SSHCFG_GLOBAL},
{ "acceptenv", sAcceptEnv, SSHCFG_ALL },
{ "setenv", sSetEnv, SSHCFG_ALL },
{ "permittunnel", sPermitTunnel, SSHCFG_ALL },
{ "permittty", sPermitTTY, SSHCFG_ALL },
{ "permituserrc", sPermitUserRC, SSHCFG_ALL },
{ "match", sMatch, SSHCFG_ALL },
{ "permitopen", sPermitOpen, SSHCFG_ALL },
{ "permitlisten", sPermitListen, 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 },
{ "authorizedprincipalscommand", sAuthorizedPrincipalsCommand, SSHCFG_ALL },
{ "authorizedprincipalscommanduser", sAuthorizedPrincipalsCommandUser, SSHCFG_ALL },
{ "versionaddendum", sVersionAddendum, SSHCFG_GLOBAL },
{ "authenticationmethods", sAuthenticationMethods, SSHCFG_ALL },
{ "streamlocalbindmask", sStreamLocalBindMask, SSHCFG_ALL },
{ "streamlocalbindunlink", sStreamLocalBindUnlink, SSHCFG_ALL },
{ "allowstreamlocalforwarding", sAllowStreamLocalForwarding, SSHCFG_ALL },
{ "fingerprinthash", sFingerprintHash, SSHCFG_GLOBAL },
{ "disableforwarding", sDisableForwarding, SSHCFG_ALL },
{ "exposeauthinfo", sExposeAuthInfo, SSHCFG_ALL },
{ "rdomain", sRDomain, SSHCFG_ALL },
{ "casignaturealgorithms", sCASignatureAlgorithms, 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 an opcode name from its number */
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";
}
/*
* 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[PATH_MAX];
if (strcasecmp(path, "none") == 0)
return xstrdup("none");
expanded = tilde_expand_filename(path, getuid());
if (path_absolute(expanded))
return expanded;
if (getcwd(cwd, sizeof(cwd)) == NULL)
fatal("%s: getcwd: %s", __func__, strerror(errno));
xasprintf(&ret, "%s/%s", cwd, expanded);
free(expanded);
return ret;
}
static void
add_listen_addr(ServerOptions *options, const char *addr,
const char *rdomain, int port)
{
u_int i;
if (port > 0)
add_one_listen_addr(options, addr, rdomain, port);
else {
for (i = 0; i < options->num_ports; i++) {
add_one_listen_addr(options, addr, rdomain,
options->ports[i]);
}
}
}
static void
add_one_listen_addr(ServerOptions *options, const char *addr,
const char *rdomain, int port)
{
struct addrinfo hints, *ai, *aitop;
char strport[NI_MAXSERV];
int gaierr;
u_int i;
/* Find listen_addrs entry for this rdomain */
for (i = 0; i < options->num_listen_addrs; i++) {
if (rdomain == NULL && options->listen_addrs[i].rdomain == NULL)
break;
if (rdomain == NULL || options->listen_addrs[i].rdomain == NULL)
continue;
if (strcmp(rdomain, options->listen_addrs[i].rdomain) == 0)
break;
}
if (i >= options->num_listen_addrs) {
/* No entry for this rdomain; allocate one */
if (i >= INT_MAX)
fatal("%s: too many listen addresses", __func__);
options->listen_addrs = xrecallocarray(options->listen_addrs,
options->num_listen_addrs, options->num_listen_addrs + 1,
sizeof(*options->listen_addrs));
i = options->num_listen_addrs++;
if (rdomain != NULL)
options->listen_addrs[i].rdomain = xstrdup(rdomain);
}
/* options->listen_addrs[i] points to the addresses for this rdomain */
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[i].addrs;
options->listen_addrs[i].addrs = aitop;
}
/* Returns nonzero if the routing domain name is valid */
static int
valid_rdomain(const char *name)
{
#if defined(HAVE_SYS_VALID_RDOMAIN)
return sys_valid_rdomain(name);
#elif defined(__OpenBSD__)
const char *errstr;
long long num;
struct rt_tableinfo info;
int mib[6];
size_t miblen = sizeof(mib);
if (name == NULL)
return 1;
num = strtonum(name, 0, 255, &errstr);
if (errstr != NULL)
return 0;
/* Check whether the table actually exists */
memset(mib, 0, sizeof(mib));
mib[0] = CTL_NET;
mib[1] = PF_ROUTE;
mib[4] = NET_RT_TABLE;
mib[5] = (int)num;
if (sysctl(mib, 6, &info, &miblen, NULL, 0) == -1)
return 0;
return 1;
#else /* defined(__OpenBSD__) */
error("Routing domains are not supported on this platform");
return 0;
#endif
}
/*
* Queue a ListenAddress to be processed once we have all of the Ports
* and AddressFamily options.
*/
static void
queue_listen_addr(ServerOptions *options, const char *addr,
const char *rdomain, int port)
{
struct queued_listenaddr *qla;
options->queued_listen_addrs = xrecallocarray(
options->queued_listen_addrs,
options->num_queued_listens, options->num_queued_listens + 1,
sizeof(*options->queued_listen_addrs));
qla = &options->queued_listen_addrs[options->num_queued_listens++];
qla->addr = xstrdup(addr);
qla->port = port;
qla->rdomain = rdomain == NULL ? NULL : xstrdup(rdomain);
}
/*
* Process queued (text) ListenAddress entries.
*/
static void
process_queued_listen_addrs(ServerOptions *options)
{
u_int i;
struct queued_listenaddr *qla;
if (options->num_ports == 0)
options->ports[options->num_ports++] = SSH_DEFAULT_PORT;
if (options->address_family == -1)
options->address_family = AF_UNSPEC;
for (i = 0; i < options->num_queued_listens; i++) {
qla = &options->queued_listen_addrs[i];
add_listen_addr(options, qla->addr, qla->rdomain, qla->port);
free(qla->addr);
free(qla->rdomain);
}
free(options->queued_listen_addrs);
options->queued_listen_addrs = NULL;
options->num_queued_listens = 0;
}
/*
* Inform channels layer of permitopen options for a single forwarding
* direction (local/remote).
*/
static void
process_permitopen_list(struct ssh *ssh, ServerOpCodes opcode,
char **opens, u_int num_opens)
{
u_int i;
int port;
char *host, *arg, *oarg, ch;
int where = opcode == sPermitOpen ? FORWARD_LOCAL : FORWARD_REMOTE;
const char *what = lookup_opcode_name(opcode);
channel_clear_permission(ssh, FORWARD_ADM, where);
if (num_opens == 0)
return; /* permit any */
/* handle keywords: "any" / "none" */
if (num_opens == 1 && strcmp(opens[0], "any") == 0)
return;
if (num_opens == 1 && strcmp(opens[0], "none") == 0) {
channel_disable_admin(ssh, where);
return;
}
/* Otherwise treat it as a list of permitted host:port */
for (i = 0; i < num_opens; i++) {
oarg = arg = xstrdup(opens[i]);
ch = '\0';
host = hpdelim2(&arg, &ch);
if (host == NULL || ch == '/')
fatal("%s: missing host in %s", __func__, what);
host = cleanhostname(host);
if (arg == NULL || ((port = permitopen_port(arg)) < 0))
fatal("%s: bad port number in %s", __func__, what);
/* Send it to channels layer */
channel_add_permission(ssh, FORWARD_ADM,
where, host, port);
free(oarg);
}
}
/*
* Inform channels layer of permitopen options from configuration.
*/
void
process_permitopen(struct ssh *ssh, ServerOptions *options)
{
process_permitopen_list(ssh, sPermitOpen,
options->permitted_opens, options->num_permitted_opens);
process_permitopen_list(ssh, sPermitListen,
options->permitted_listens,
options->num_permitted_listens);
}
struct connection_info *
get_connection_info(struct ssh *ssh, int populate, int use_dns)
{
static struct connection_info ci;
if (ssh == NULL || !populate)
return &ci;
ci.host = auth_get_canonical_hostname(ssh, use_dns);
ci.address = ssh_remote_ipaddr(ssh);
ci.laddress = ssh_local_ipaddr(ssh);
ci.lport = ssh_local_port(ssh);
ci.rdomain = ssh_packet_rdomain_in(ssh);
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. 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 void
match_test_missing_fatal(const char *criteria, const char *attrib)
{
fatal("'Match %s' in configuration but '%s' not in connection "
"test specification.", criteria, attrib);
}
/*
* 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, attributes = 0, port;
char *arg, *attrib, *cp = *condition;
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') {
attributes++;
if (strcasecmp(attrib, "all") == 0) {
if (attributes != 1 ||
((arg = strdelim(&cp)) != NULL && *arg != '\0')) {
error("'all' cannot be combined with other "
"Match attributes");
return -1;
}
*condition = cp;
return 1;
}
if ((arg = strdelim(&cp)) == NULL || *arg == '\0') {
error("Missing Match criteria for %s", attrib);
return -1;
}
if (strcasecmp(attrib, "user") == 0) {
if (ci == NULL || (ci->test && ci->user == NULL)) {
result = 0;
continue;
}
if (ci->user == NULL)
match_test_missing_fatal("User", "user");
if (match_usergroup_pattern_list(ci->user, arg) != 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->test && ci->user == NULL)) {
result = 0;
continue;
}
if (ci->user == NULL)
match_test_missing_fatal("Group", "user");
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->test && ci->host == NULL)) {
result = 0;
continue;
}
if (ci->host == NULL)
match_test_missing_fatal("Host", "host");
if (match_hostname(ci->host, arg) != 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->test && ci->address == NULL)) {
result = 0;
continue;
}
if (ci->address == NULL)
match_test_missing_fatal("Address", "addr");
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->test && ci->laddress == NULL)) {
result = 0;
continue;
}
if (ci->laddress == NULL)
match_test_missing_fatal("LocalAddress",
"laddr");
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->test && ci->lport == -1)) {
result = 0;
continue;
}
if (ci->lport == 0)
match_test_missing_fatal("LocalPort", "lport");
/* 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 if (strcasecmp(attrib, "rdomain") == 0) {
if (ci == NULL || (ci->test && ci->rdomain == NULL)) {
result = 0;
continue;
}
if (ci->rdomain == NULL)
match_test_missing_fatal("RDomain", "rdomain");
if (match_pattern_list(ci->rdomain, arg, 0) != 1)
result = 0;
else
debug("user %.100s matched 'RDomain %.100s' at "
"line %d", ci->rdomain, arg, line);
} else {
error("Unsupported Match attribute %s", attrib);
return -1;
}
}
if (attributes == 0) {
error("One or more attributes required for Match");
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_flag[] = {
{ "yes", 1 },
{ "no", 0 },
{ NULL, -1 }
};
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 },
{ "prohibit-password", PERMIT_NO_PASSWD },
{ "forced-commands-only", PERMIT_FORCED_ONLY },
{ "yes", PERMIT_YES },
{ "no", PERMIT_NO },
{ NULL, -1 }
};
static const struct multistate multistate_compression[] = {
{ "yes", COMP_DELAYED },
{ "delayed", COMP_DELAYED },
{ "no", COMP_NONE },
{ NULL, -1 }
};
static const struct multistate multistate_gatewayports[] = {
{ "clientspecified", 2 },
{ "yes", 1 },
{ "no", 0 },
{ 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 ch, *cp, ***chararrayptr, **charptr, *arg, *arg2, *p;
int cmdline = 0, *intptr, value, value2, n, port;
SyslogFacility *log_facility_ptr;
LogLevel *log_level_ptr;
ServerOpCodes opcode;
u_int i, *uintptr, uvalue, flags = 0;
size_t len;
long long val64;
const struct multistate *multistate_ptr;
const char *errstr;
/* Strip trailing whitespace. Allow \f (form feed) at EOL only */
if ((len = strlen(line)) == 0)
return 0;
for (len--; len > 0; len--) {
if (strchr(WHITESPACE "\f", line[len]) == NULL)
break;
line[len] = '\0';
}
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->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 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 (*activep && *intptr == -1)
*intptr = value;
break;
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) {
port = 0;
p = arg;
} else {
arg2 = NULL;
ch = '\0';
p = hpdelim2(&arg, &ch);
if (p == NULL || ch == '/')
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);
}
/* Optional routing table */
arg2 = NULL;
if ((arg = strdelim(&cp)) != NULL) {
if (strcmp(arg, "rdomain") != 0 ||
(arg2 = strdelim(&cp)) == NULL)
fatal("%s line %d: bad ListenAddress syntax",
filename, linenum);
if (!valid_rdomain(arg2))
fatal("%s line %d: bad routing domain",
filename, linenum);
}
queue_listen_addr(options, p, arg2, port);
break;
case sAddressFamily:
intptr = &options->address_family;
multistate_ptr = multistate_addressfamily;
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:
arg = strdelim(&cp);
if (!arg || *arg == '\0')
fatal("%s line %d: missing file name.",
filename, linenum);
if (*activep) {
servconf_add_hostkey(filename, linenum,
options, arg, 1);
}
break;
case sHostKeyAgent:
charptr = &options->host_key_agent;
arg = strdelim(&cp);
if (!arg || *arg == '\0')
fatal("%s line %d: missing socket name.",
filename, linenum);
if (*activep && *charptr == NULL)
*charptr = !strcmp(arg, SSH_AUTHSOCKET_ENV_NAME) ?
xstrdup(arg) : derelativise_path(arg);
break;
case sHostCertificate:
arg = strdelim(&cp);
if (!arg || *arg == '\0')
fatal("%s line %d: missing file name.",
filename, linenum);
if (*activep)
servconf_add_hostcert(filename, linenum, options, arg);
break;
case sPidFile:
charptr = &options->pid_file;
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 sPermitRootLogin:
intptr = &options->permit_root_login;
multistate_ptr = multistate_permitrootlogin;
goto parse_multistate;
case sIgnoreRhosts:
intptr = &options->ignore_rhosts;
parse_flag:
multistate_ptr = multistate_flag;
goto parse_multistate;
case sIgnoreUserKnownHosts:
intptr = &options->ignore_user_known_hosts;
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 sHostbasedAcceptedKeyTypes:
charptr = &options->hostbased_key_types;
parse_keytypes:
arg = strdelim(&cp);
if (!arg || *arg == '\0')
fatal("%s line %d: Missing argument.",
filename, linenum);
if (*arg != '-' &&
!sshkey_names_valid2(*arg == '+' || *arg == '^' ?
arg + 1 : arg, 1))
fatal("%s line %d: Bad key types '%s'.",
filename, linenum, arg ? arg : "<NONE>");
if (*activep && *charptr == NULL)
*charptr = xstrdup(arg);
break;
case sHostKeyAlgorithms:
charptr = &options->hostkeyalgorithms;
goto parse_keytypes;
case sCASignatureAlgorithms:
charptr = &options->ca_sign_algorithms;
goto parse_keytypes;
case sPubkeyAuthentication:
intptr = &options->pubkey_authentication;
goto parse_flag;
case sPubkeyAcceptedKeyTypes:
charptr = &options->pubkey_key_types;
goto parse_keytypes;
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 sGssStrictAcceptor:
intptr = &options->gss_strict_acceptor;
goto parse_flag;
case sPasswordAuthentication:
intptr = &options->password_authentication;
goto parse_flag;
case sKbdInteractiveAuthentication:
intptr = &options->kbd_interactive_authentication;
goto parse_flag;
case sChallengeResponseAuthentication:
intptr = &options->challenge_response_authentication;
goto parse_flag;
case sPrintMotd:
intptr = &options->print_motd;
goto parse_flag;
case sPrintLastLog:
intptr = &options->print_lastlog;
goto parse_flag;
case sX11Forwarding:
intptr = &options->x11_forwarding;
goto parse_flag;
case sX11DisplayOffset:
intptr = &options->x11_display_offset;
parse_int:
arg = strdelim(&cp);
if ((errstr = atoi_err(arg, &value)) != NULL)
fatal("%s line %d: integer value %s.",
filename, linenum, errstr);
if (*activep && *intptr == -1)
*intptr = value;
break;
case sX11UseLocalhost:
intptr = &options->x11_use_localhost;
goto parse_flag;
case sXAuthLocation:
charptr = &options->xauth_location;
goto parse_filename;
case sPermitTTY:
intptr = &options->permit_tty;
goto parse_flag;
case sPermitUserRC:
intptr = &options->permit_user_rc;
goto parse_flag;
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;
charptr = &options->permit_user_env_whitelist;
arg = strdelim(&cp);
if (!arg || *arg == '\0')
fatal("%s line %d: missing argument.",
filename, linenum);
value = 0;
p = NULL;
if (strcmp(arg, "yes") == 0)
value = 1;
else if (strcmp(arg, "no") == 0)
value = 0;
else {
/* Pattern-list specified */
value = 1;
p = xstrdup(arg);
}
if (*activep && *intptr == -1) {
*intptr = value;
*charptr = p;
p = NULL;
}
free(p);
break;
case sCompression:
intptr = &options->compression;
multistate_ptr = multistate_compression;
goto parse_multistate;
case sRekeyLimit:
arg = strdelim(&cp);
if (!arg || *arg == '\0')
fatal("%.200s line %d: Missing argument.", filename,
linenum);
if (strcmp(arg, "default") == 0) {
val64 = 0;
} else {
if (scan_scaled(arg, &val64) == -1)
fatal("%.200s line %d: Bad number '%s': %s",
filename, linenum, arg, strerror(errno));
if (val64 != 0 && val64 < 16)
fatal("%.200s line %d: RekeyLimit too small",
filename, linenum);
}
if (*activep && options->rekey_limit == -1)
options->rekey_limit = val64;
if (cp != NULL) { /* optional rekey interval present */
if (strcmp(cp, "none") == 0) {
(void)strdelim(&cp); /* discard */
break;
}
intptr = &options->rekey_interval;
goto parse_time;
}
break;
case sGatewayPorts:
intptr = &options->fwd_opts.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 (*activep && *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 sAllowStreamLocalForwarding:
intptr = &options->allow_streamlocal_forwarding;
multistate_ptr = multistate_tcpfwd;
goto parse_multistate;
case sAllowAgentForwarding:
intptr = &options->allow_agent_forwarding;
goto parse_flag;
case sDisableForwarding:
intptr = &options->disable_forwarding;
goto parse_flag;
case sAllowUsers:
while ((arg = strdelim(&cp)) && *arg != '\0') {
if (match_user(NULL, NULL, NULL, arg) == -1)
fatal("%s line %d: invalid AllowUsers pattern: "
"\"%.100s\"", filename, linenum, arg);
if (!*activep)
continue;
array_append(filename, linenum, "AllowUsers",
&options->allow_users, &options->num_allow_users,
arg);
}
break;
case sDenyUsers:
while ((arg = strdelim(&cp)) && *arg != '\0') {
if (match_user(NULL, NULL, NULL, arg) == -1)
fatal("%s line %d: invalid DenyUsers pattern: "
"\"%.100s\"", filename, linenum, arg);
if (!*activep)
continue;
array_append(filename, linenum, "DenyUsers",
&options->deny_users, &options->num_deny_users,
arg);
}
break;
case sAllowGroups:
while ((arg = strdelim(&cp)) && *arg != '\0') {
if (!*activep)
continue;
array_append(filename, linenum, "AllowGroups",
&options->allow_groups, &options->num_allow_groups,
arg);
}
break;
case sDenyGroups:
while ((arg = strdelim(&cp)) && *arg != '\0') {
if (!*activep)
continue;
array_append(filename, linenum, "DenyGroups",
&options->deny_groups, &options->num_deny_groups,
arg);
}
break;
case sCiphers:
arg = strdelim(&cp);
if (!arg || *arg == '\0')
fatal("%s line %d: Missing argument.", filename, linenum);
if (*arg != '-' &&
!ciphers_valid(*arg == '+' || *arg == '^' ? arg + 1 : 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 (*arg != '-' &&
!mac_valid(*arg == '+' || *arg == '^' ? arg + 1 : 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 (*arg != '-' &&
!kex_names_valid(*arg == '+' || *arg == '^' ?
arg + 1 : 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 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 = xreallocarray(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') {
arg = tilde_expand_filename(arg, getuid());
array_append(filename, linenum,
"AuthorizedKeysFile",
&options->authorized_keys_files,
&options->num_authkeys_files, arg);
free(arg);
}
}
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 (!*activep)
continue;
array_append(filename, linenum, "AcceptEnv",
&options->accept_env, &options->num_accept_env,
arg);
}
break;
case sSetEnv:
uvalue = options->num_setenv;
while ((arg = strdelimw(&cp)) && *arg != '\0') {
if (strchr(arg, '=') == NULL)
fatal("%s line %d: Invalid environment.",
filename, linenum);
if (!*activep || uvalue != 0)
continue;
array_append(filename, linenum, "SetEnv",
&options->setenv, &options->num_setenv, 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 (*activep && *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 sPermitListen:
case sPermitOpen:
if (opcode == sPermitListen) {
uintptr = &options->num_permitted_listens;
chararrayptr = &options->permitted_listens;
} else {
uintptr = &options->num_permitted_opens;
chararrayptr = &options->permitted_opens;
}
arg = strdelim(&cp);
if (!arg || *arg == '\0')
fatal("%s line %d: missing %s specification",
filename, linenum, lookup_opcode_name(opcode));
uvalue = *uintptr; /* modified later */
if (strcmp(arg, "any") == 0 || strcmp(arg, "none") == 0) {
if (*activep && uvalue == 0) {
*uintptr = 1;
*chararrayptr = xcalloc(1,
sizeof(**chararrayptr));
(*chararrayptr)[0] = xstrdup(arg);
}
break;
}
for (; arg != NULL && *arg != '\0'; arg = strdelim(&cp)) {
if (opcode == sPermitListen &&
strchr(arg, ':') == NULL) {
/*
* Allow bare port number for PermitListen
* to indicate a wildcard listen host.
*/
xasprintf(&arg2, "*:%s", arg);
} else {
arg2 = xstrdup(arg);
ch = '\0';
p = hpdelim2(&arg, &ch);
if (p == NULL || ch == '/') {
fatal("%s line %d: missing host in %s",
filename, linenum,
lookup_opcode_name(opcode));
}
p = cleanhostname(p);
}
if (arg == NULL ||
((port = permitopen_port(arg)) < 0)) {
fatal("%s line %d: bad port number in %s",
filename, linenum,
lookup_opcode_name(opcode));
}
if (*activep && uvalue == 0) {
array_append(filename, linenum,
lookup_opcode_name(opcode),
chararrayptr, uintptr, arg2);
}
free(arg2);
}
break;
case sForceCommand:
if (cp == NULL || *cp == '\0')
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 || *cp == '\0')
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:
if (cp == NULL)
fatal("%.200s line %d: Missing argument.", filename,
linenum);
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 (!arg || *arg == '\0')
fatal("%s line %d: missing AuthorizedKeysCommandUser "
"argument.", filename, linenum);
if (*activep && *charptr == NULL)
*charptr = xstrdup(arg);
break;
case sAuthorizedPrincipalsCommand:
if (cp == NULL)
fatal("%.200s line %d: Missing argument.", filename,
linenum);
len = strspn(cp, WHITESPACE);
if (*activep &&
options->authorized_principals_command == NULL) {
if (cp[len] != '/' && strcasecmp(cp + len, "none") != 0)
fatal("%.200s line %d: "
"AuthorizedPrincipalsCommand must be "
"an absolute path", filename, linenum);
options->authorized_principals_command =
xstrdup(cp + len);
}
return 0;
case sAuthorizedPrincipalsCommandUser:
charptr = &options->authorized_principals_command_user;
arg = strdelim(&cp);
if (!arg || *arg == '\0')
fatal("%s line %d: missing "
"AuthorizedPrincipalsCommandUser argument.",
filename, linenum);
if (*activep && *charptr == NULL)
*charptr = xstrdup(arg);
break;
case sAuthenticationMethods:
if (options->num_auth_methods == 0) {
value = 0; /* seen "any" pseudo-method */
value2 = 0; /* successfully parsed any method */
while ((arg = strdelim(&cp)) && *arg != '\0') {
if (strcmp(arg, "any") == 0) {
if (options->num_auth_methods > 0) {
fatal("%s line %d: \"any\" "
"must appear alone in "
"AuthenticationMethods",
filename, linenum);
}
value = 1;
} else if (value) {
fatal("%s line %d: \"any\" must appear "
"alone in AuthenticationMethods",
filename, linenum);
} else if (auth2_methods_valid(arg, 0) != 0) {
fatal("%s line %d: invalid "
"authentication method list.",
filename, linenum);
}
value2 = 1;
if (!*activep)
continue;
array_append(filename, linenum,
"AuthenticationMethods",
&options->auth_methods,
&options->num_auth_methods, arg);
}
if (value2 == 0) {
fatal("%s line %d: no AuthenticationMethods "
"specified", filename, linenum);
}
}
return 0;
case sStreamLocalBindMask:
arg = strdelim(&cp);
if (!arg || *arg == '\0')
fatal("%s line %d: missing StreamLocalBindMask "
"argument.", filename, linenum);
/* Parse mode in octal format */
value = strtol(arg, &p, 8);
if (arg == p || value < 0 || value > 0777)
fatal("%s line %d: Bad mask.", filename, linenum);
if (*activep)
options->fwd_opts.streamlocal_bind_mask = (mode_t)value;
break;
case sStreamLocalBindUnlink:
intptr = &options->fwd_opts.streamlocal_bind_unlink;
goto parse_flag;
case sFingerprintHash:
arg = strdelim(&cp);
if (!arg || *arg == '\0')
fatal("%.200s line %d: Missing argument.",
filename, linenum);
if ((value = ssh_digest_alg_by_name(arg)) == -1)
fatal("%.200s line %d: Invalid hash algorithm \"%s\".",
filename, linenum, arg);
if (*activep)
options->fingerprint_hash = value;
break;
case sExposeAuthInfo:
intptr = &options->expose_userauth_info;
goto parse_flag;
case sRDomain:
charptr = &options->routing_domain;
arg = strdelim(&cp);
if (!arg || *arg == '\0')
fatal("%.200s line %d: Missing argument.",
filename, linenum);
if (strcasecmp(arg, "none") != 0 && strcmp(arg, "%D") != 0 &&
!valid_rdomain(arg))
fatal("%s line %d: bad routing domain",
filename, linenum);
if (*activep && *charptr == NULL)
*charptr = xstrdup(arg);
break;
case sDeprecated:
case sIgnore:
case sUnsupported:
do_log2(opcode == sIgnore ?
SYSLOG_LEVEL_DEBUG2 : SYSLOG_LEVEL_INFO,
"%s line %d: %s option %s", filename, linenum,
opcode == sUnsupported ? "Unsupported" : "Deprecated", 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, struct sshbuf *conf)
{
char *line = NULL, *cp;
size_t linesize = 0;
FILE *f;
int r, lineno = 0;
debug2("%s: filename %s", __func__, filename);
if ((f = fopen(filename, "r")) == NULL) {
perror(filename);
exit(1);
}
sshbuf_reset(conf);
while (getline(&line, &linesize, f) != -1) {
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");
if ((r = sshbuf_put(conf, cp, strlen(cp))) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
}
free(line);
if ((r = sshbuf_put_u8(conf, 0)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
fclose(f);
debug2("%s: done config len = %zu", __func__, sshbuf_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, "rdomain=", 8) == 0) {
ci->rdomain = xstrdup(p + 8);
} 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;
}
/*
* 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 explicitly sent in mm_getpwnamallow().
*/
void
copy_set_server_options(ServerOptions *dst, ServerOptions *src, int preauth)
{
#define M_CP_INTOPT(n) do {\
if (src->n != -1) \
dst->n = src->n; \
} while (0)
M_CP_INTOPT(password_authentication);
M_CP_INTOPT(gss_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(permit_root_login);
M_CP_INTOPT(permit_empty_passwd);
M_CP_INTOPT(allow_tcp_forwarding);
M_CP_INTOPT(allow_streamlocal_forwarding);
M_CP_INTOPT(allow_agent_forwarding);
M_CP_INTOPT(disable_forwarding);
M_CP_INTOPT(expose_userauth_info);
M_CP_INTOPT(permit_tun);
M_CP_INTOPT(fwd_opts.gateway_ports);
M_CP_INTOPT(fwd_opts.streamlocal_bind_unlink);
M_CP_INTOPT(x11_display_offset);
M_CP_INTOPT(x11_forwarding);
M_CP_INTOPT(x11_use_localhost);
M_CP_INTOPT(permit_tty);
M_CP_INTOPT(permit_user_rc);
M_CP_INTOPT(max_sessions);
M_CP_INTOPT(max_authtries);
M_CP_INTOPT(client_alive_count_max);
M_CP_INTOPT(client_alive_interval);
M_CP_INTOPT(ip_qos_interactive);
M_CP_INTOPT(ip_qos_bulk);
M_CP_INTOPT(rekey_limit);
M_CP_INTOPT(rekey_interval);
M_CP_INTOPT(log_level);
/*
* The bind_mask is a mode_t that may be unsigned, so we can't use
* M_CP_INTOPT - it does a signed comparison that causes compiler
* warnings.
*/
if (src->fwd_opts.streamlocal_bind_mask != (mode_t)-1) {
dst->fwd_opts.streamlocal_bind_mask =
src->fwd_opts.streamlocal_bind_mask;
}
/* M_CP_STROPT and M_CP_STRARRAYOPT should not appear before here */
#define M_CP_STROPT(n) do {\
if (src->n != NULL && dst->n != src->n) { \
free(dst->n); \
dst->n = src->n; \
} \
} while(0)
#define M_CP_STRARRAYOPT(s, num_s) do {\
u_int i; \
if (src->num_s != 0) { \
for (i = 0; i < dst->num_s; i++) \
free(dst->s[i]); \
free(dst->s); \
dst->s = xcalloc(src->num_s, sizeof(*dst->s)); \
for (i = 0; i < src->num_s; i++) \
dst->s[i] = xstrdup(src->s[i]); \
dst->num_s = src->num_s; \
} \
} while(0)
/* See comment in servconf.h */
COPY_MATCH_STRING_OPTS();
/* Arguments that accept '+...' need to be expanded */
assemble_algorithms(dst);
/*
* The only things that should be below this point are string options
* which are only used after authentication.
*/
if (preauth)
return;
/* These options may be "none" to clear a global setting */
M_CP_STROPT(adm_forced_command);
if (option_clear_or_none(dst->adm_forced_command)) {
free(dst->adm_forced_command);
dst->adm_forced_command = NULL;
}
M_CP_STROPT(chroot_directory);
if (option_clear_or_none(dst->chroot_directory)) {
free(dst->chroot_directory);
dst->chroot_directory = NULL;
}
}
#undef M_CP_INTOPT
#undef M_CP_STROPT
#undef M_CP_STRARRAYOPT
void
parse_server_config(ServerOptions *options, const char *filename,
struct sshbuf *conf, struct connection_info *connectinfo)
{
int active, linenum, bad_options = 0;
char *cp, *obuf, *cbuf;
debug2("%s: config %s len %zu", __func__, filename, sshbuf_len(conf));
if ((obuf = cbuf = sshbuf_dup_string(conf)) == NULL)
fatal("%s: sshbuf_dup_string failed", __func__);
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++;
}
free(obuf);
if (bad_options > 0)
fatal("%s: terminating, %d bad configuration options",
filename, bad_options);
process_queued_listen_addrs(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 sAllowTcpForwarding:
return fmt_multistate_int(val, multistate_tcpfwd);
case sAllowStreamLocalForwarding:
return fmt_multistate_int(val, multistate_tcpfwd);
case sFingerprintHash:
return ssh_digest_alg_name(val);
default:
switch (val) {
case 0:
return "no";
case 1:
return "yes";
default:
return "UNKNOWN";
}
}
}
static void
dump_cfg_int(ServerOpCodes code, int val)
{
printf("%s %d\n", lookup_opcode_name(code), val);
}
static void
dump_cfg_oct(ServerOpCodes code, int val)
{
printf("%s 0%o\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)
{
printf("%s %s\n", lookup_opcode_name(code),
val == NULL ? "none" : 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;
if (count <= 0 && code != sAuthenticationMethods)
return;
printf("%s", lookup_opcode_name(code));
for (i = 0; i < count; i++)
printf(" %s", vals[i]);
if (code == sAuthenticationMethods && count == 0)
printf(" any");
printf("\n");
}
static char *
format_listen_addrs(struct listenaddr *la)
{
int r;
struct addrinfo *ai;
char addr[NI_MAXHOST], port[NI_MAXSERV];
char *laddr1 = xstrdup(""), *laddr2 = NULL;
/*
* ListenAddress must be after Port. add_one_listen_addr pushes
* addresses onto a stack, so to maintain ordering we need to
* print these in reverse order.
*/
for (ai = la->addrs; ai; ai = ai->ai_next) {
if ((r = getnameinfo(ai->ai_addr, ai->ai_addrlen, addr,
sizeof(addr), port, sizeof(port),
NI_NUMERICHOST|NI_NUMERICSERV)) != 0) {
error("getnameinfo: %.100s", ssh_gai_strerror(r));
continue;
}
laddr2 = laddr1;
if (ai->ai_family == AF_INET6) {
xasprintf(&laddr1, "listenaddress [%s]:%s%s%s\n%s",
addr, port,
la->rdomain == NULL ? "" : " rdomain ",
la->rdomain == NULL ? "" : la->rdomain,
laddr2);
} else {
xasprintf(&laddr1, "listenaddress %s:%s%s%s\n%s",
addr, port,
la->rdomain == NULL ? "" : " rdomain ",
la->rdomain == NULL ? "" : la->rdomain,
laddr2);
}
free(laddr2);
}
return laddr1;
}
void
dump_config(ServerOptions *o)
{
char *s;
u_int i;
/* 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(sAddressFamily, o->address_family);
for (i = 0; i < o->num_listen_addrs; i++) {
s = format_listen_addrs(&o->listen_addrs[i]);
printf("%s", s);
free(s);
}
/* integer arguments */
#ifdef USE_PAM
dump_cfg_fmtint(sUsePAM, o->use_pam);
#endif
dump_cfg_int(sLoginGraceTime, o->login_grace_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);
dump_cfg_oct(sStreamLocalBindMask, o->fwd_opts.streamlocal_bind_mask);
/* 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(sHostbasedAuthentication, o->hostbased_authentication);
dump_cfg_fmtint(sHostbasedUsesNameFromPacketOnly,
o->hostbased_uses_name_from_packet_only);
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
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);
#ifndef DISABLE_LASTLOG
dump_cfg_fmtint(sPrintLastLog, o->print_lastlog);
#endif
dump_cfg_fmtint(sX11Forwarding, o->x11_forwarding);
dump_cfg_fmtint(sX11UseLocalhost, o->x11_use_localhost);
dump_cfg_fmtint(sPermitTTY, o->permit_tty);
dump_cfg_fmtint(sPermitUserRC, o->permit_user_rc);
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(sCompression, o->compression);
dump_cfg_fmtint(sGatewayPorts, o->fwd_opts.gateway_ports);
dump_cfg_fmtint(sUseDNS, o->use_dns);
dump_cfg_fmtint(sAllowTcpForwarding, o->allow_tcp_forwarding);
dump_cfg_fmtint(sAllowAgentForwarding, o->allow_agent_forwarding);
dump_cfg_fmtint(sDisableForwarding, o->disable_forwarding);
dump_cfg_fmtint(sAllowStreamLocalForwarding, o->allow_streamlocal_forwarding);
dump_cfg_fmtint(sStreamLocalBindUnlink, o->fwd_opts.streamlocal_bind_unlink);
dump_cfg_fmtint(sFingerprintHash, o->fingerprint_hash);
dump_cfg_fmtint(sExposeAuthInfo, o->expose_userauth_info);
/* string arguments */
dump_cfg_string(sPidFile, o->pid_file);
dump_cfg_string(sXAuthLocation, o->xauth_location);
dump_cfg_string(sCiphers, o->ciphers ? o->ciphers : KEX_SERVER_ENCRYPT);
dump_cfg_string(sMacs, o->macs ? o->macs : KEX_SERVER_MAC);
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 == '\0'
? "none" : o->version_addendum);
dump_cfg_string(sAuthorizedKeysCommand, o->authorized_keys_command);
dump_cfg_string(sAuthorizedKeysCommandUser, o->authorized_keys_command_user);
dump_cfg_string(sAuthorizedPrincipalsCommand, o->authorized_principals_command);
dump_cfg_string(sAuthorizedPrincipalsCommandUser, o->authorized_principals_command_user);
dump_cfg_string(sHostKeyAgent, o->host_key_agent);
dump_cfg_string(sKexAlgorithms,
o->kex_algorithms ? o->kex_algorithms : KEX_SERVER_KEX);
dump_cfg_string(sCASignatureAlgorithms, o->ca_sign_algorithms ?
o->ca_sign_algorithms : SSH_ALLOWED_CA_SIGALGS);
dump_cfg_string(sHostbasedAcceptedKeyTypes, o->hostbased_key_types ?
o->hostbased_key_types : KEX_DEFAULT_PK_ALG);
dump_cfg_string(sHostKeyAlgorithms, o->hostkeyalgorithms ?
o->hostkeyalgorithms : KEX_DEFAULT_PK_ALG);
dump_cfg_string(sPubkeyAcceptedKeyTypes, o->pubkey_key_types ?
o->pubkey_key_types : KEX_DEFAULT_PK_ALG);
dump_cfg_string(sRDomain, o->routing_domain);
/* 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(sHostCertificate, 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(sSetEnv, o->num_setenv, o->setenv);
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);
s = NULL;
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));
printf("rekeylimit %llu %d\n", (unsigned long long)o->rekey_limit,
o->rekey_interval);
printf("permitopen");
if (o->num_permitted_opens == 0)
printf(" any");
else {
for (i = 0; i < o->num_permitted_opens; i++)
printf(" %s", o->permitted_opens[i]);
}
printf("\n");
printf("permitlisten");
if (o->num_permitted_listens == 0)
printf(" any");
else {
for (i = 0; i < o->num_permitted_listens; i++)
printf(" %s", o->permitted_listens[i]);
}
printf("\n");
if (o->permit_user_env_whitelist == NULL) {
dump_cfg_fmtint(sPermitUserEnvironment, o->permit_user_env);
} else {
printf("permituserenvironment %s\n",
o->permit_user_env_whitelist);
}
}
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