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openssh/servconf.c
djm@openbsd.org 6072e4c938
upstream: Split per-connection sshd-session binary 
This splits the user authentication code from the sshd-session
binary into a separate sshd-auth binary. This will be executed by
sshd-session to complete the user authentication phase of the
protocol only.

Splitting this code into a separate binary ensures that the crucial
pre-authentication attack surface has an entirely disjoint address
space from the code used for the rest of the connection. It also
yields a small runtime memory saving as the authentication code will
be unloaded after thhe authentication phase completes.

Joint work with markus@ feedback deraadt@

Tested in snaps since last week

OpenBSD-Commit-ID: 9c3b2087ae08626ec31b4177b023db600e986d9c
2024-10-14 14:01:37 +11:00

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/* $OpenBSD: servconf.c,v 1.419 2024/09/25 01:24:04 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 <sys/stat.h>
#ifdef __OpenBSD__
#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
#ifdef USE_SYSTEM_GLOB
# include <glob.h>
#else
# include "openbsd-compat/glob.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 "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"
#if !defined(SSHD_PAM_SERVICE)
# define SSHD_PAM_SERVICE "sshd"
#endif
static void add_listen_addr(ServerOptions *, const char *,
const char *, int);
static void add_one_listen_addr(ServerOptions *, const char *,
const char *, int);
static void parse_server_config_depth(ServerOptions *options,
const char *filename, struct sshbuf *conf, struct include_list *includes,
struct connection_info *connectinfo, int flags, int *activep, int depth);
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;
options->pam_service_name = NULL;
/* 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->num_log_verbose = 0;
options->log_verbose = NULL;
options->hostbased_authentication = -1;
options->hostbased_uses_name_from_packet_only = -1;
options->hostbased_accepted_algos = NULL;
options->hostkeyalgorithms = NULL;
options->pubkey_authentication = -1;
options->pubkey_auth_options = -1;
options->pubkey_accepted_algos = 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->permit_empty_passwd = -1;
options->permit_user_env = -1;
options->permit_user_env_allowlist = 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->per_source_max_startups = -1;
options->per_source_masklen_ipv4 = -1;
options->per_source_masklen_ipv6 = -1;
options->per_source_penalty_exempt = NULL;
options->per_source_penalty.enabled = -1;
options->per_source_penalty.max_sources4 = -1;
options->per_source_penalty.max_sources6 = -1;
options->per_source_penalty.overflow_mode = -1;
options->per_source_penalty.overflow_mode6 = -1;
options->per_source_penalty.penalty_crash = -1;
options->per_source_penalty.penalty_authfail = -1;
options->per_source_penalty.penalty_noauth = -1;
options->per_source_penalty.penalty_grace = -1;
options->per_source_penalty.penalty_refuseconnection = -1;
options->per_source_penalty.penalty_max = -1;
options->per_source_penalty.penalty_min = -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->sk_provider = 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;
options->required_rsa_size = -1;
options->channel_timeouts = NULL;
options->num_channel_timeouts = 0;
options->unused_connection_timeout = -1;
options->sshd_session_path = NULL;
options->sshd_auth_path = NULL;
options->refuse_connection = -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;
char *def_cipher, *def_mac, *def_kex, *def_key, *def_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, ',');
/* remove unsupported algos from default lists */
def_cipher = match_filter_allowlist(KEX_SERVER_ENCRYPT, all_cipher);
def_mac = match_filter_allowlist(KEX_SERVER_MAC, all_mac);
def_kex = match_filter_allowlist(KEX_SERVER_KEX, all_kex);
def_key = match_filter_allowlist(KEX_DEFAULT_PK_ALG, all_key);
def_sig = match_filter_allowlist(SSH_ALLOWED_CA_SIGALGS, all_sig);
#define ASSEMBLE(what, defaults, all) \
do { \
if ((r = kex_assemble_names(&o->what, defaults, all)) != 0) \
fatal_fr(r, "%s", #what); \
} while (0)
ASSEMBLE(ciphers, def_cipher, all_cipher);
ASSEMBLE(macs, def_mac, all_mac);
ASSEMBLE(kex_algorithms, def_kex, all_kex);
ASSEMBLE(hostkeyalgorithms, def_key, all_key);
ASSEMBLE(hostbased_accepted_algos, def_key, all_key);
ASSEMBLE(pubkey_accepted_algos, def_key, all_key);
ASSEMBLE(ca_sign_algorithms, def_sig, all_sig);
#undef ASSEMBLE
free(all_cipher);
free(all_mac);
free(all_kex);
free(all_key);
free(all_sig);
free(def_cipher);
free(def_mac);
free(def_kex);
free(def_key);
free(def_sig);
}
void
servconf_add_hostkey(const char *file, const int line,
ServerOptions *options, const char *path, int userprovided)
{
char *apath = derelativise_path(path);
opt_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);
opt_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;
if (options->pam_service_name == NULL)
options->pam_service_name = xstrdup(SSHD_PAM_SERVICE);
/* 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->moduli_file == NULL)
options->moduli_file = xstrdup(_PATH_DH_MODULI);
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->pubkey_auth_options == -1)
options->pubkey_auth_options = 0;
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 = 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_allowlist = NULL;
}
if (options->compression == -1)
#ifdef WITH_ZLIB
options->compression = COMP_DELAYED;
#else
options->compression = COMP_NONE;
#endif
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->per_source_max_startups == -1)
options->per_source_max_startups = INT_MAX;
if (options->per_source_masklen_ipv4 == -1)
options->per_source_masklen_ipv4 = 32;
if (options->per_source_masklen_ipv6 == -1)
options->per_source_masklen_ipv6 = 128;
if (options->per_source_penalty.enabled == -1)
options->per_source_penalty.enabled = 1;
if (options->per_source_penalty.max_sources4 == -1)
options->per_source_penalty.max_sources4 = 65536;
if (options->per_source_penalty.max_sources6 == -1)
options->per_source_penalty.max_sources6 = 65536;
if (options->per_source_penalty.overflow_mode == -1)
options->per_source_penalty.overflow_mode = PER_SOURCE_PENALTY_OVERFLOW_PERMISSIVE;
if (options->per_source_penalty.overflow_mode6 == -1)
options->per_source_penalty.overflow_mode6 = options->per_source_penalty.overflow_mode;
if (options->per_source_penalty.penalty_crash == -1)
options->per_source_penalty.penalty_crash = 90;
if (options->per_source_penalty.penalty_grace == -1)
options->per_source_penalty.penalty_grace = 10;
if (options->per_source_penalty.penalty_authfail == -1)
options->per_source_penalty.penalty_authfail = 5;
if (options->per_source_penalty.penalty_noauth == -1)
options->per_source_penalty.penalty_noauth = 1;
if (options->per_source_penalty.penalty_refuseconnection == -1)
options->per_source_penalty.penalty_refuseconnection = 10;
if (options->per_source_penalty.penalty_min == -1)
options->per_source_penalty.penalty_min = 15;
if (options->per_source_penalty.penalty_max == -1)
options->per_source_penalty.penalty_max = 600;
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) {
opt_array_append("[default]", 0, "AuthorizedKeysFiles",
&options->authorized_keys_files,
&options->num_authkeys_files,
_PATH_SSH_USER_PERMITTED_KEYS);
opt_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;
if (options->sk_provider == NULL)
options->sk_provider = xstrdup("internal");
if (options->required_rsa_size == -1)
options->required_rsa_size = SSH_RSA_MINIMUM_MODULUS_SIZE;
if (options->unused_connection_timeout == -1)
options->unused_connection_timeout = 0;
if (options->sshd_session_path == NULL)
options->sshd_session_path = xstrdup(_PATH_SSHD_SESSION);
if (options->sshd_auth_path == NULL)
options->sshd_auth_path = xstrdup(_PATH_SSHD_AUTH);
if (options->refuse_connection == -1)
options->refuse_connection = 0;
assemble_algorithms(options);
#define CLEAR_ON_NONE(v) \
do { \
if (option_clear_or_none(v)) { \
free(v); \
v = NULL; \
} \
} while(0)
#define CLEAR_ON_NONE_ARRAY(v, nv, none) \
do { \
if (options->nv == 1 && \
strcasecmp(options->v[0], none) == 0) { \
free(options->v[0]); \
free(options->v); \
options->v = NULL; \
options->nv = 0; \
} \
} 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->sk_provider);
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);
CLEAR_ON_NONE(options->host_key_agent);
CLEAR_ON_NONE(options->per_source_penalty_exempt);
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]);
CLEAR_ON_NONE_ARRAY(channel_timeouts, num_channel_timeouts, "none");
CLEAR_ON_NONE_ARRAY(auth_methods, num_auth_methods, "any");
#undef CLEAR_ON_NONE
#undef CLEAR_ON_NONE_ARRAY
}
/* Keyword tokens. */
typedef enum {
sBadOption, /* == unknown option */
/* Portable-specific options */
sUsePAM, sPAMServiceName,
/* Standard Options */
sPort, sHostKeyFile, sLoginGraceTime,
sPermitRootLogin, sLogFacility, sLogLevel, sLogVerbose,
sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup,
sKerberosGetAFSToken, 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, sModuliFile,
sGatewayPorts, sPubkeyAuthentication, sPubkeyAcceptedAlgorithms,
sXAuthLocation, sSubsystem, sMaxStartups, sMaxAuthTries, sMaxSessions,
sBanner, sUseDNS, sHostbasedAuthentication,
sHostbasedUsesNameFromPacketOnly, sHostbasedAcceptedAlgorithms,
sHostKeyAlgorithms, sPerSourceMaxStartups, sPerSourceNetBlockSize,
sPerSourcePenalties, sPerSourcePenaltyExemptList,
sClientAliveInterval, sClientAliveCountMax, sAuthorizedKeysFile,
sGssAuthentication, sGssCleanupCreds, sGssStrictAcceptor,
sAcceptEnv, sSetEnv, sPermitTunnel,
sMatch, sPermitOpen, sPermitListen, sForceCommand, sChrootDirectory,
sUsePrivilegeSeparation, sAllowAgentForwarding,
sHostCertificate, sInclude,
sRevokedKeys, sTrustedUserCAKeys, sAuthorizedPrincipalsFile,
sAuthorizedPrincipalsCommand, sAuthorizedPrincipalsCommandUser,
sKexAlgorithms, sCASignatureAlgorithms, sIPQoS, sVersionAddendum,
sAuthorizedKeysCommand, sAuthorizedKeysCommandUser,
sAuthenticationMethods, sHostKeyAgent, sPermitUserRC,
sStreamLocalBindMask, sStreamLocalBindUnlink,
sAllowStreamLocalForwarding, sFingerprintHash, sDisableForwarding,
sExposeAuthInfo, sRDomain, sPubkeyAuthOptions, sSecurityKeyProvider,
sRequiredRSASize, sChannelTimeout, sUnusedConnectionTimeout,
sSshdSessionPath, sSshdAuthPath, sRefuseConnection,
sDeprecated, sIgnore, sUnsupported
} ServerOpCodes;
#define SSHCFG_GLOBAL 0x01 /* allowed in main section of config */
#define SSHCFG_MATCH 0x02 /* allowed inside a Match section */
#define SSHCFG_ALL (SSHCFG_GLOBAL|SSHCFG_MATCH)
#define SSHCFG_NEVERMATCH 0x04 /* Match never matches; internal only */
#define SSHCFG_MATCH_ONLY 0x08 /* Match only in conditional blocks; internal only */
/* 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 },
{ "pamservicename", sPAMServiceName, SSHCFG_ALL },
#else
{ "usepam", sUnsupported, SSHCFG_GLOBAL },
{ "pamservicename", sUnsupported, SSHCFG_ALL },
#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 },
{ "modulifile", sModuliFile, 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 },
{ "logverbose", sLogVerbose, SSHCFG_ALL },
{ "rhostsauthentication", sDeprecated, SSHCFG_GLOBAL },
{ "rhostsrsaauthentication", sDeprecated, SSHCFG_ALL },
{ "hostbasedauthentication", sHostbasedAuthentication, SSHCFG_ALL },
{ "hostbasedusesnamefrompacketonly", sHostbasedUsesNameFromPacketOnly, SSHCFG_ALL },
{ "hostbasedacceptedalgorithms", sHostbasedAcceptedAlgorithms, SSHCFG_ALL },
{ "hostbasedacceptedkeytypes", sHostbasedAcceptedAlgorithms, SSHCFG_ALL }, /* obsolete */
{ "hostkeyalgorithms", sHostKeyAlgorithms, SSHCFG_GLOBAL },
{ "rsaauthentication", sDeprecated, SSHCFG_ALL },
{ "pubkeyauthentication", sPubkeyAuthentication, SSHCFG_ALL },
{ "pubkeyacceptedalgorithms", sPubkeyAcceptedAlgorithms, SSHCFG_ALL },
{ "pubkeyacceptedkeytypes", sPubkeyAcceptedAlgorithms, SSHCFG_ALL }, /* obsolete */
{ "pubkeyauthoptions", sPubkeyAuthOptions, 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", sKbdInteractiveAuthentication, SSHCFG_ALL }, /* alias */
{ "skeyauthentication", sKbdInteractiveAuthentication, SSHCFG_ALL }, /* alias */
{ "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_ALL },
{ "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_ALL },
{ "maxstartups", sMaxStartups, SSHCFG_GLOBAL },
{ "persourcemaxstartups", sPerSourceMaxStartups, SSHCFG_GLOBAL },
{ "persourcenetblocksize", sPerSourceNetBlockSize, SSHCFG_GLOBAL },
{ "persourcepenalties", sPerSourcePenalties, SSHCFG_GLOBAL },
{ "persourcepenaltyexemptlist", sPerSourcePenaltyExemptList, 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 },
{ "include", sInclude, SSHCFG_ALL },
{ "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 },
{ "securitykeyprovider", sSecurityKeyProvider, SSHCFG_GLOBAL },
{ "requiredrsasize", sRequiredRSASize, SSHCFG_ALL },
{ "channeltimeout", sChannelTimeout, SSHCFG_ALL },
{ "unusedconnectiontimeout", sUnusedConnectionTimeout, SSHCFG_ALL },
{ "sshdsessionpath", sSshdSessionPath, SSHCFG_GLOBAL },
{ "sshdauthpath", sSshdAuthPath, SSHCFG_GLOBAL },
{ "refuseconnection", sRefuseConnection, 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_f("getcwd: %s", 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_f("too many listen addresses");
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;
}
/*
* 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(const char *full_line, int *acp, char ***avp,
int line, struct connection_info *ci)
{
int result = 1, attributes = 0, port;
char *arg, *attrib = NULL, *oattrib;
if (ci == NULL)
debug3("checking syntax for 'Match %s'", full_line);
else {
debug3("checking match for '%s' user %s%s host %s addr %s "
"laddr %s lport %d", full_line,
ci->user ? ci->user : "(null)",
ci->user_invalid ? " (invalid)" : "",
ci->host ? ci->host : "(null)",
ci->address ? ci->address : "(null)",
ci->laddress ? ci->laddress : "(null)", ci->lport);
}
while ((oattrib = argv_next(acp, avp)) != NULL) {
attrib = xstrdup(oattrib);
/* Terminate on comment */
if (*attrib == '#') {
argv_consume(acp); /* mark all arguments consumed */
break;
}
arg = NULL;
attributes++;
/* Criterion "all" has no argument and must appear alone */
if (strcasecmp(attrib, "all") == 0) {
if (attributes > 1 ||
((arg = argv_next(acp, avp)) != NULL &&
*arg != '\0' && *arg != '#')) {
error("'all' cannot be combined with other "
"Match attributes");
result = -1;
goto out;
}
if (arg != NULL && *arg == '#')
argv_consume(acp); /* consume remaining args */
result = 1;
goto out;
}
/* Criterion "invalid-user" also has no argument */
if (strcasecmp(attrib, "invalid-user") == 0) {
if (ci == NULL)
continue;
if (ci->user_invalid == 0)
result = 0;
else
debug("matched invalid-user at line %d", line);
continue;
}
/* Keep this list in sync with below */
if (strprefix(attrib, "user=", 1) != NULL ||
strprefix(attrib, "group=", 1) != NULL ||
strprefix(attrib, "host=", 1) != NULL ||
strprefix(attrib, "address=", 1) != NULL ||
strprefix(attrib, "localaddress=", 1) != NULL ||
strprefix(attrib, "localport=", 1) != NULL ||
strprefix(attrib, "rdomain=", 1) != NULL) {
arg = strchr(attrib, '=');
*(arg++) = '\0';
} else {
arg = argv_next(acp, avp);
}
/* All other criteria require an argument */
if (arg == NULL || *arg == '\0' || *arg == '#') {
error("Missing Match criteria for %s", attrib);
result = -1;
goto out;
}
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:
result = -1;
goto out;
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)) {
if (addr_match_list(NULL, arg) != 0)
fatal("Invalid Match address argument "
"'%s' at line %d", arg, line);
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:
result = -1;
goto out;
}
} else if (strcasecmp(attrib, "localaddress") == 0){
if (ci == NULL || (ci->test && ci->laddress == NULL)) {
if (addr_match_list(NULL, arg) != 0)
fatal("Invalid Match localaddress "
"argument '%s' at line %d", arg,
line);
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:
result = -1;
goto out;
}
} else if (strcasecmp(attrib, "localport") == 0) {
if ((port = a2port(arg)) == -1) {
error("Invalid LocalPort '%s' on Match line",
arg);
result = -1;
goto out;
}
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", oattrib);
result = -1;
goto out;
}
free(attrib);
attrib = NULL;
}
if (attributes == 0) {
error("One or more attributes required for Match");
return -1;
}
out:
if (ci != NULL && result != -1)
debug3("match %sfound", result ? "" : "not ");
free(attrib);
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_ignore_rhosts[] = {
{ "yes", IGNORE_RHOSTS_YES },
{ "no", IGNORE_RHOSTS_NO },
{ "shosts-only", IGNORE_RHOSTS_SHOSTS },
{ 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[] = {
#ifdef WITH_ZLIB
{ "yes", COMP_DELAYED },
{ "delayed", COMP_DELAYED },
#endif
{ "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 }
};
static int
process_server_config_line_depth(ServerOptions *options, char *line,
const char *filename, int linenum, int *activep,
struct connection_info *connectinfo, int *inc_flags, int depth,
struct include_list *includes)
{
char *str, ***chararrayptr, **charptr, *arg, *arg2, *p, *keyword;
int cmdline = 0, *intptr, value, value2, n, port, oactive, r;
int ca_only = 0, found = 0;
SyslogFacility *log_facility_ptr;
LogLevel *log_level_ptr;
ServerOpCodes opcode;
u_int i, *uintptr, flags = 0;
size_t len;
long long val64;
const struct multistate *multistate_ptr;
const char *errstr;
struct include_item *item;
glob_t gbuf;
char **oav = NULL, **av;
int oac = 0, ac;
int ret = -1;
char **strs = NULL; /* string array arguments; freed implicitly */
u_int nstrs = 0;
/* 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';
}
str = line;
if ((keyword = strdelim(&str)) == NULL)
return 0;
/* Ignore leading whitespace */
if (*keyword == '\0')
keyword = strdelim(&str);
if (!keyword || !*keyword || *keyword == '#')
return 0;
if (str == NULL || *str == '\0') {
error("%s line %d: no argument after keyword \"%s\"",
filename, linenum, keyword);
return -1;
}
intptr = NULL;
charptr = NULL;
opcode = parse_token(keyword, filename, linenum, &flags);
if (argv_split(str, &oac, &oav, 1) != 0) {
error("%s line %d: invalid quotes", filename, linenum);
return -1;
}
ac = oac;
av = oav;
if (activep == NULL) { /* We are processing a command line directive */
cmdline = 1;
activep = &cmdline;
}
if (*activep && opcode != sMatch && opcode != sInclude)
debug3("%s:%d setting %s %s", filename, linenum, keyword, str);
if (*activep == 0 && !(flags & SSHCFG_MATCH)) {
if (connectinfo == NULL) {
fatal("%s line %d: Directive '%s' is not allowed "
"within a Match block", filename, linenum, keyword);
} else { /* this is a directive we have already processed */
ret = 0;
goto out;
}
}
switch (opcode) {
/* Portable-specific options */
case sUsePAM:
intptr = &options->use_pam;
goto parse_flag;
case sPAMServiceName:
charptr = &options->pam_service_name;
arg = argv_next(&ac, &av);
if (!arg || *arg == '\0') {
fatal("%s line %d: missing argument.",
filename, linenum);
}
if (*activep && *charptr == NULL)
*charptr = xstrdup(arg);
break;
/* Standard Options */
case sBadOption:
goto out;
case sPort:
/* ignore ports from configfile if cmdline specifies ports */
if (options->ports_from_cmdline) {
argv_consume(&ac);
break;
}
if (options->num_ports >= MAX_PORTS)
fatal("%s line %d: too many ports.",
filename, linenum);
arg = argv_next(&ac, &av);
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 = argv_next(&ac, &av);
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 = argv_next(&ac, &av);
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;
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);
}
/* Optional routing table */
arg2 = NULL;
if ((arg = argv_next(&ac, &av)) != NULL) {
if (strcmp(arg, "rdomain") != 0 ||
(arg2 = argv_next(&ac, &av)) == 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 = argv_next(&ac, &av);
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 = argv_next(&ac, &av);
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 = argv_next(&ac, &av);
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 = argv_next(&ac, &av);
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 = argv_next(&ac, &av);
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 sModuliFile:
charptr = &options->moduli_file;
goto parse_filename;
case sPermitRootLogin:
intptr = &options->permit_root_login;
multistate_ptr = multistate_permitrootlogin;
goto parse_multistate;
case sIgnoreRhosts:
intptr = &options->ignore_rhosts;
multistate_ptr = multistate_ignore_rhosts;
goto parse_multistate;
case sIgnoreUserKnownHosts:
intptr = &options->ignore_user_known_hosts;
parse_flag:
multistate_ptr = multistate_flag;
goto parse_multistate;
case sHostbasedAuthentication:
intptr = &options->hostbased_authentication;
goto parse_flag;
case sHostbasedUsesNameFromPacketOnly:
intptr = &options->hostbased_uses_name_from_packet_only;
goto parse_flag;
case sHostbasedAcceptedAlgorithms:
charptr = &options->hostbased_accepted_algos;
ca_only = 0;
parse_pubkey_algos:
arg = argv_next(&ac, &av);
if (!arg || *arg == '\0')
fatal("%s line %d: Missing argument.",
filename, linenum);
if (*arg != '-' &&
!sshkey_names_valid2(*arg == '+' || *arg == '^' ?
arg + 1 : arg, 1, ca_only))
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;
ca_only = 0;
goto parse_pubkey_algos;
case sCASignatureAlgorithms:
charptr = &options->ca_sign_algorithms;
ca_only = 1;
goto parse_pubkey_algos;
case sPubkeyAuthentication:
intptr = &options->pubkey_authentication;
ca_only = 0;
goto parse_flag;
case sPubkeyAcceptedAlgorithms:
charptr = &options->pubkey_accepted_algos;
ca_only = 0;
goto parse_pubkey_algos;
case sPubkeyAuthOptions:
intptr = &options->pubkey_auth_options;
value = 0;
while ((arg = argv_next(&ac, &av)) != NULL) {
if (strcasecmp(arg, "none") == 0)
continue;
if (strcasecmp(arg, "touch-required") == 0)
value |= PUBKEYAUTH_TOUCH_REQUIRED;
else if (strcasecmp(arg, "verify-required") == 0)
value |= PUBKEYAUTH_VERIFY_REQUIRED;
else {
error("%s line %d: unsupported %s option %s",
filename, linenum, keyword, arg);
goto out;
}
}
if (*activep && *intptr == -1)
*intptr = value;
break;
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 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 = argv_next(&ac, &av);
if ((errstr = atoi_err(arg, &value)) != NULL)
fatal("%s line %d: %s integer value %s.",
filename, linenum, keyword, 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_allowlist;
arg = argv_next(&ac, &av);
if (!arg || *arg == '\0')
fatal("%s line %d: %s missing argument.",
filename, linenum, keyword);
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 = argv_next(&ac, &av);
if (!arg || *arg == '\0')
fatal("%s line %d: %s missing argument.",
filename, linenum, keyword);
if (strcmp(arg, "default") == 0) {
val64 = 0;
} else {
if (scan_scaled(arg, &val64) == -1)
fatal("%.200s line %d: Bad %s number '%s': %s",
filename, linenum, keyword,
arg, strerror(errno));
if (val64 != 0 && val64 < 16)
fatal("%.200s line %d: %s too small",
filename, linenum, keyword);
}
if (*activep && options->rekey_limit == -1)
options->rekey_limit = val64;
if (ac != 0) { /* optional rekey interval present */
if (strcmp(av[0], "none") == 0) {
(void)argv_next(&ac, &av); /* 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 = argv_next(&ac, &av);
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 = argv_next(&ac, &av);
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 sLogVerbose:
found = options->num_log_verbose == 0;
while ((arg = argv_next(&ac, &av)) != NULL) {
if (*arg == '\0') {
error("%s line %d: keyword %s empty argument",
filename, linenum, keyword);
goto out;
}
/* Allow "none" only in first position */
if (strcasecmp(arg, "none") == 0) {
if (nstrs > 0 || ac > 0) {
error("%s line %d: keyword %s \"none\" "
"argument must appear alone.",
filename, linenum, keyword);
goto out;
}
}
opt_array_append(filename, linenum, keyword,
&strs, &nstrs, arg);
}
if (nstrs == 0) {
fatal("%s line %d: no %s specified",
filename, linenum, keyword);
}
if (found && *activep) {
options->log_verbose = strs;
options->num_log_verbose = nstrs;
strs = NULL; /* transferred */
nstrs = 0;
}
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:
chararrayptr = &options->allow_users;
uintptr = &options->num_allow_users;
parse_allowdenyusers:
/* XXX appends to list; doesn't respect first-match-wins */
while ((arg = argv_next(&ac, &av)) != NULL) {
if (*arg == '\0' ||
match_user(NULL, NULL, NULL, arg) == -1)
fatal("%s line %d: invalid %s pattern: \"%s\"",
filename, linenum, keyword, arg);
found = 1;
if (!*activep)
continue;
opt_array_append(filename, linenum, keyword,
chararrayptr, uintptr, arg);
}
if (!found) {
fatal("%s line %d: no %s specified",
filename, linenum, keyword);
}
break;
case sDenyUsers:
chararrayptr = &options->deny_users;
uintptr = &options->num_deny_users;
goto parse_allowdenyusers;
case sAllowGroups:
chararrayptr = &options->allow_groups;
uintptr = &options->num_allow_groups;
/* XXX appends to list; doesn't respect first-match-wins */
parse_allowdenygroups:
while ((arg = argv_next(&ac, &av)) != NULL) {
if (*arg == '\0')
fatal("%s line %d: empty %s pattern",
filename, linenum, keyword);
found = 1;
if (!*activep)
continue;
opt_array_append(filename, linenum, keyword,
chararrayptr, uintptr, arg);
}
if (!found) {
fatal("%s line %d: no %s specified",
filename, linenum, keyword);
}
break;
case sDenyGroups:
chararrayptr = &options->deny_groups;
uintptr = &options->num_deny_groups;
goto parse_allowdenygroups;
case sCiphers:
arg = argv_next(&ac, &av);
if (!arg || *arg == '\0')
fatal("%s line %d: %s missing argument.",
filename, linenum, keyword);
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 = argv_next(&ac, &av);
if (!arg || *arg == '\0')
fatal("%s line %d: %s missing argument.",
filename, linenum, keyword);
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 = argv_next(&ac, &av);
if (!arg || *arg == '\0')
fatal("%s line %d: %s missing argument.",
filename, linenum, keyword);
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:
arg = argv_next(&ac, &av);
if (!arg || *arg == '\0')
fatal("%s line %d: %s missing argument.",
filename, linenum, keyword);
if (!*activep) {
argv_consume(&ac);
break;
}
found = 0;
for (i = 0; i < options->num_subsystems; i++) {
if (strcmp(arg, options->subsystem_name[i]) == 0) {
found = 1;
break;
}
}
if (found) {
debug("%s line %d: Subsystem '%s' already defined.",
filename, linenum, arg);
argv_consume(&ac);
break;
}
options->subsystem_name = xrecallocarray(
options->subsystem_name, options->num_subsystems,
options->num_subsystems + 1,
sizeof(*options->subsystem_name));
options->subsystem_command = xrecallocarray(
options->subsystem_command, options->num_subsystems,
options->num_subsystems + 1,
sizeof(*options->subsystem_command));
options->subsystem_args = xrecallocarray(
options->subsystem_args, options->num_subsystems,
options->num_subsystems + 1,
sizeof(*options->subsystem_args));
options->subsystem_name[options->num_subsystems] = xstrdup(arg);
arg = argv_next(&ac, &av);
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) */
arg = argv_assemble(1, &arg); /* quote command correctly */
arg2 = argv_assemble(ac, av); /* rest of command */
xasprintf(&options->subsystem_args[options->num_subsystems],
"%s%s%s", arg, *arg2 == '\0' ? "" : " ", arg2);
free(arg2);
free(arg);
argv_consume(&ac);
options->num_subsystems++;
break;
case sMaxStartups:
arg = argv_next(&ac, &av);
if (!arg || *arg == '\0')
fatal("%s line %d: %s missing argument.",
filename, linenum, keyword);
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: Invalid %s spec.",
filename, linenum, keyword);
} else if (n != 1)
fatal("%s line %d: Invalid %s spec.",
filename, linenum, keyword);
else
options->max_startups = options->max_startups_begin;
if (options->max_startups <= 0 ||
options->max_startups_begin <= 0)
fatal("%s line %d: Invalid %s spec.",
filename, linenum, keyword);
break;
case sPerSourceNetBlockSize:
arg = argv_next(&ac, &av);
if (!arg || *arg == '\0')
fatal("%s line %d: %s missing argument.",
filename, linenum, keyword);
switch (n = sscanf(arg, "%d:%d", &value, &value2)) {
case 2:
if (value2 < 0 || value2 > 128)
n = -1;
/* FALLTHROUGH */
case 1:
if (value < 0 || value > 32)
n = -1;
}
if (n != 1 && n != 2)
fatal("%s line %d: Invalid %s spec.",
filename, linenum, keyword);
if (*activep) {
options->per_source_masklen_ipv4 = value;
options->per_source_masklen_ipv6 = value2;
}
break;
case sPerSourceMaxStartups:
arg = argv_next(&ac, &av);
if (!arg || *arg == '\0')
fatal("%s line %d: %s missing argument.",
filename, linenum, keyword);
if (strcmp(arg, "none") == 0) { /* no limit */
value = INT_MAX;
} else {
if ((errstr = atoi_err(arg, &value)) != NULL)
fatal("%s line %d: %s integer value %s.",
filename, linenum, keyword, errstr);
}
if (*activep && options->per_source_max_startups == -1)
options->per_source_max_startups = value;
break;
case sPerSourcePenaltyExemptList:
charptr = &options->per_source_penalty_exempt;
arg = argv_next(&ac, &av);
if (!arg || *arg == '\0')
fatal("%s line %d: missing argument.",
filename, linenum);
if (addr_match_list(NULL, arg) != 0) {
fatal("%s line %d: keyword %s "
"invalid address argument.",
filename, linenum, keyword);
}
if (*activep && *charptr == NULL)
*charptr = xstrdup(arg);
break;
case sPerSourcePenalties:
while ((arg = argv_next(&ac, &av)) != NULL) {
found = 1;
value = -1;
value2 = 0;
p = NULL;
/* Allow no/yes only in first position */
if (strcasecmp(arg, "no") == 0 ||
(value2 = (strcasecmp(arg, "yes") == 0))) {
if (ac > 0) {
fatal("%s line %d: keyword %s \"%s\" "
"argument must appear alone.",
filename, linenum, keyword, arg);
}
if (*activep &&
options->per_source_penalty.enabled == -1)
options->per_source_penalty.enabled = value2;
continue;
} else if (strncmp(arg, "crash:", 6) == 0) {
p = arg + 6;
intptr = &options->per_source_penalty.penalty_crash;
} else if (strncmp(arg, "authfail:", 9) == 0) {
p = arg + 9;
intptr = &options->per_source_penalty.penalty_authfail;
} else if (strncmp(arg, "noauth:", 7) == 0) {
p = arg + 7;
intptr = &options->per_source_penalty.penalty_noauth;
} else if (strncmp(arg, "grace-exceeded:", 15) == 0) {
p = arg + 15;
intptr = &options->per_source_penalty.penalty_grace;
} else if (strncmp(arg, "refuseconnection:", 17) == 0) {
p = arg + 17;
intptr = &options->per_source_penalty.penalty_refuseconnection;
} else if (strncmp(arg, "max:", 4) == 0) {
p = arg + 4;
intptr = &options->per_source_penalty.penalty_max;
} else if (strncmp(arg, "min:", 4) == 0) {
p = arg + 4;
intptr = &options->per_source_penalty.penalty_min;
} else if (strncmp(arg, "max-sources4:", 13) == 0) {
intptr = &options->per_source_penalty.max_sources4;
if ((errstr = atoi_err(arg+13, &value)) != NULL)
fatal("%s line %d: %s value %s.",
filename, linenum, keyword, errstr);
} else if (strncmp(arg, "max-sources6:", 13) == 0) {
intptr = &options->per_source_penalty.max_sources6;
if ((errstr = atoi_err(arg+13, &value)) != NULL)
fatal("%s line %d: %s value %s.",
filename, linenum, keyword, errstr);
} else if (strcmp(arg, "overflow:deny-all") == 0) {
intptr = &options->per_source_penalty.overflow_mode;
value = PER_SOURCE_PENALTY_OVERFLOW_DENY_ALL;
} else if (strcmp(arg, "overflow:permissive") == 0) {
intptr = &options->per_source_penalty.overflow_mode;
value = PER_SOURCE_PENALTY_OVERFLOW_PERMISSIVE;
} else if (strcmp(arg, "overflow6:deny-all") == 0) {
intptr = &options->per_source_penalty.overflow_mode6;
value = PER_SOURCE_PENALTY_OVERFLOW_DENY_ALL;
} else if (strcmp(arg, "overflow6:permissive") == 0) {
intptr = &options->per_source_penalty.overflow_mode6;
value = PER_SOURCE_PENALTY_OVERFLOW_PERMISSIVE;
} else {
fatal("%s line %d: unsupported %s keyword %s",
filename, linenum, keyword, arg);
}
/* If no value was parsed above, assume it's a time */
if (value == -1 && (value = convtime(p)) == -1) {
fatal("%s line %d: invalid %s time value.",
filename, linenum, keyword);
}
if (*activep && *intptr == -1) {
*intptr = value;
/* any option implicitly enables penalties */
options->per_source_penalty.enabled = 1;
}
}
if (!found) {
fatal("%s line %d: no %s specified",
filename, linenum, keyword);
}
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:
found = options->num_authkeys_files == 0;
while ((arg = argv_next(&ac, &av)) != NULL) {
if (*arg == '\0') {
error("%s line %d: keyword %s empty argument",
filename, linenum, keyword);
goto out;
}
arg2 = tilde_expand_filename(arg, getuid());
opt_array_append(filename, linenum, keyword,
&strs, &nstrs, arg2);
free(arg2);
}
if (nstrs == 0) {
fatal("%s line %d: no %s specified",
filename, linenum, keyword);
}
if (found && *activep) {
options->authorized_keys_files = strs;
options->num_authkeys_files = nstrs;
strs = NULL; /* transferred */
nstrs = 0;
}
break;
case sAuthorizedPrincipalsFile:
charptr = &options->authorized_principals_file;
arg = argv_next(&ac, &av);
if (!arg || *arg == '\0')
fatal("%s line %d: %s missing argument.",
filename, linenum, keyword);
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:
/* XXX appends to list; doesn't respect first-match-wins */
while ((arg = argv_next(&ac, &av)) != NULL) {
if (*arg == '\0' || strchr(arg, '=') != NULL)
fatal("%s line %d: Invalid environment name.",
filename, linenum);
found = 1;
if (!*activep)
continue;
opt_array_append(filename, linenum, keyword,
&options->accept_env, &options->num_accept_env,
arg);
}
if (!found) {
fatal("%s line %d: no %s specified",
filename, linenum, keyword);
}
break;
case sSetEnv:
found = options->num_setenv == 0;
while ((arg = argv_next(&ac, &av)) != NULL) {
if (*arg == '\0' || strchr(arg, '=') == NULL)
fatal("%s line %d: Invalid environment.",
filename, linenum);
if (lookup_setenv_in_list(arg, strs, nstrs) != NULL) {
debug2("%s line %d: ignoring duplicate env "
"name \"%.64s\"", filename, linenum, arg);
continue;
}
opt_array_append(filename, linenum, keyword,
&strs, &nstrs, arg);
}
if (nstrs == 0) {
fatal("%s line %d: no %s specified",
filename, linenum, keyword);
}
if (found && *activep) {
options->setenv = strs;
options->num_setenv = nstrs;
strs = NULL; /* transferred */
nstrs = 0;
}
break;
case sPermitTunnel:
intptr = &options->permit_tun;
arg = argv_next(&ac, &av);
if (!arg || *arg == '\0')
fatal("%s line %d: %s missing argument.",
filename, linenum, keyword);
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 %s argument %s",
filename, linenum, keyword, arg);
if (*activep && *intptr == -1)
*intptr = value;
break;
case sInclude:
if (cmdline) {
fatal("Include directive not supported as a "
"command-line option");
}
value = 0;
while ((arg2 = argv_next(&ac, &av)) != NULL) {
if (*arg2 == '\0') {
error("%s line %d: keyword %s empty argument",
filename, linenum, keyword);
goto out;
}
value++;
found = 0;
if (*arg2 != '/' && *arg2 != '~') {
xasprintf(&arg, "%s/%s", SSHDIR, arg2);
} else
arg = xstrdup(arg2);
/*
* Don't let included files clobber the containing
* file's Match state.
*/
oactive = *activep;
/* consult cache of include files */
TAILQ_FOREACH(item, includes, entry) {
if (strcmp(item->selector, arg) != 0)
continue;
if (item->filename != NULL) {
parse_server_config_depth(options,
item->filename, item->contents,
includes, connectinfo,
(*inc_flags & SSHCFG_MATCH_ONLY
? SSHCFG_MATCH_ONLY : (oactive
? 0 : SSHCFG_NEVERMATCH)),
activep, depth + 1);
}
found = 1;
*activep = oactive;
}
if (found != 0) {
free(arg);
continue;
}
/* requested glob was not in cache */
debug2("%s line %d: new include %s",
filename, linenum, arg);
if ((r = glob(arg, 0, NULL, &gbuf)) != 0) {
if (r != GLOB_NOMATCH) {
fatal("%s line %d: include \"%s\" glob "
"failed", filename, linenum, arg);
}
/*
* If no entry matched then record a
* placeholder to skip later glob calls.
*/
debug2("%s line %d: no match for %s",
filename, linenum, arg);
item = xcalloc(1, sizeof(*item));
item->selector = strdup(arg);
TAILQ_INSERT_TAIL(includes,
item, entry);
}
if (gbuf.gl_pathc > INT_MAX)
fatal_f("too many glob results");
for (n = 0; n < (int)gbuf.gl_pathc; n++) {
debug2("%s line %d: including %s",
filename, linenum, gbuf.gl_pathv[n]);
item = xcalloc(1, sizeof(*item));
item->selector = strdup(arg);
item->filename = strdup(gbuf.gl_pathv[n]);
if ((item->contents = sshbuf_new()) == NULL)
fatal_f("sshbuf_new failed");
load_server_config(item->filename,
item->contents);
parse_server_config_depth(options,
item->filename, item->contents,
includes, connectinfo,
(*inc_flags & SSHCFG_MATCH_ONLY
? SSHCFG_MATCH_ONLY : (oactive
? 0 : SSHCFG_NEVERMATCH)),
activep, depth + 1);
*activep = oactive;
TAILQ_INSERT_TAIL(includes, item, entry);
}
globfree(&gbuf);
free(arg);
}
if (value == 0) {
fatal("%s line %d: %s missing filename argument",
filename, linenum, keyword);
}
break;
case sMatch:
if (cmdline)
fatal("Match directive not supported as a command-line "
"option");
value = match_cfg_line(str, &ac, &av, linenum,
(*inc_flags & SSHCFG_NEVERMATCH ? NULL : connectinfo));
if (value < 0)
fatal("%s line %d: Bad Match condition", filename,
linenum);
*activep = (*inc_flags & SSHCFG_NEVERMATCH) ? 0 : value;
/*
* The MATCH_ONLY flag is applicable only until the first
* match block.
*/
*inc_flags &= ~SSHCFG_MATCH_ONLY;
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;
}
found = *uintptr == 0;
while ((arg = argv_next(&ac, &av)) != NULL) {
if (strcmp(arg, "any") == 0 ||
strcmp(arg, "none") == 0) {
if (nstrs != 0) {
fatal("%s line %d: %s must appear "
"alone on a %s line.",
filename, linenum, arg, keyword);
}
opt_array_append(filename, linenum, keyword,
&strs, &nstrs, arg);
continue;
}
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);
p = hpdelim(&arg);
if (p == NULL) {
fatal("%s line %d: %s missing host",
filename, linenum, keyword);
}
p = cleanhostname(p);
}
if (arg == NULL ||
((port = permitopen_port(arg)) < 0)) {
fatal("%s line %d: %s bad port number",
filename, linenum, keyword);
}
opt_array_append(filename, linenum, keyword,
&strs, &nstrs, arg2);
free(arg2);
}
if (nstrs == 0) {
fatal("%s line %d: %s missing argument.",
filename, linenum, keyword);
}
if (found && *activep) {
*chararrayptr = strs;
*uintptr = nstrs;
strs = NULL; /* transferred */
nstrs = 0;
}
break;
case sForceCommand:
if (str == NULL || *str == '\0')
fatal("%s line %d: %s missing argument.",
filename, linenum, keyword);
len = strspn(str, WHITESPACE);
if (*activep && options->adm_forced_command == NULL)
options->adm_forced_command = xstrdup(str + len);
argv_consume(&ac);
break;
case sChrootDirectory:
charptr = &options->chroot_directory;
arg = argv_next(&ac, &av);
if (!arg || *arg == '\0')
fatal("%s line %d: %s missing argument.",
filename, linenum, keyword);
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 sSecurityKeyProvider:
charptr = &options->sk_provider;
arg = argv_next(&ac, &av);
if (!arg || *arg == '\0')
fatal("%s line %d: %s missing argument.",
filename, linenum, keyword);
if (*activep && *charptr == NULL) {
*charptr = strcasecmp(arg, "internal") == 0 ?
xstrdup(arg) : derelativise_path(arg);
/* increase optional counter */
if (intptr != NULL)
*intptr = *intptr + 1;
}
break;
case sIPQoS:
arg = argv_next(&ac, &av);
if (!arg || *arg == '\0')
fatal("%s line %d: %s missing argument.",
filename, linenum, keyword);
if ((value = parse_ipqos(arg)) == -1)
fatal("%s line %d: Bad %s value: %s",
filename, linenum, keyword, arg);
arg = argv_next(&ac, &av);
if (arg == NULL)
value2 = value;
else if ((value2 = parse_ipqos(arg)) == -1)
fatal("%s line %d: Bad %s value: %s",
filename, linenum, keyword, arg);
if (*activep) {
options->ip_qos_interactive = value;
options->ip_qos_bulk = value2;
}
break;
case sVersionAddendum:
if (str == NULL || *str == '\0')
fatal("%s line %d: %s missing argument.",
filename, linenum, keyword);
len = strspn(str, WHITESPACE);
if (strchr(str + len, '\r') != NULL) {
fatal("%.200s line %d: Invalid %s argument",
filename, linenum, keyword);
}
if ((arg = strchr(line, '#')) != NULL) {
*arg = '\0';
rtrim(line);
}
if (*activep && options->version_addendum == NULL) {
if (strcasecmp(str + len, "none") == 0)
options->version_addendum = xstrdup("");
else
options->version_addendum = xstrdup(str + len);
}
argv_consume(&ac);
break;
case sAuthorizedKeysCommand:
charptr = &options->authorized_keys_command;
parse_command:
len = strspn(str, WHITESPACE);
if (str[len] != '/' && strcasecmp(str + len, "none") != 0) {
fatal("%.200s line %d: %s must be an absolute path",
filename, linenum, keyword);
}
if (*activep && *charptr == NULL)
*charptr = xstrdup(str + len);
argv_consume(&ac);
break;
case sAuthorizedKeysCommandUser:
charptr = &options->authorized_keys_command_user;
parse_localuser:
arg = argv_next(&ac, &av);
if (!arg || *arg == '\0') {
fatal("%s line %d: missing %s argument.",
filename, linenum, keyword);
}
if (*activep && *charptr == NULL)
*charptr = xstrdup(arg);
break;
case sAuthorizedPrincipalsCommand:
charptr = &options->authorized_principals_command;
goto parse_command;
case sAuthorizedPrincipalsCommandUser:
charptr = &options->authorized_principals_command_user;
goto parse_localuser;
case sAuthenticationMethods:
found = options->num_auth_methods == 0;
value = 0; /* seen "any" pseudo-method */
while ((arg = argv_next(&ac, &av)) != NULL) {
if (strcmp(arg, "any") == 0) {
if (nstrs > 0) {
fatal("%s line %d: \"any\" must "
"appear alone in %s",
filename, linenum, keyword);
}
value = 1;
} else if (value) {
fatal("%s line %d: \"any\" must appear "
"alone in %s", filename, linenum, keyword);
} else if (auth2_methods_valid(arg, 0) != 0) {
fatal("%s line %d: invalid %s method list.",
filename, linenum, keyword);
}
opt_array_append(filename, linenum, keyword,
&strs, &nstrs, arg);
}
if (nstrs == 0) {
fatal("%s line %d: no %s specified",
filename, linenum, keyword);
}
if (found && *activep) {
options->auth_methods = strs;
options->num_auth_methods = nstrs;
strs = NULL; /* transferred */
nstrs = 0;
}
break;
case sStreamLocalBindMask:
arg = argv_next(&ac, &av);
if (!arg || *arg == '\0')
fatal("%s line %d: %s missing argument.",
filename, linenum, keyword);
/* Parse mode in octal format */
value = strtol(arg, &p, 8);
if (arg == p || value < 0 || value > 0777)
fatal("%s line %d: Invalid %s.",
filename, linenum, keyword);
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 = argv_next(&ac, &av);
if (!arg || *arg == '\0')
fatal("%s line %d: %s missing argument.",
filename, linenum, keyword);
if ((value = ssh_digest_alg_by_name(arg)) == -1)
fatal("%.200s line %d: Invalid %s algorithm \"%s\".",
filename, linenum, keyword, arg);
if (*activep)
options->fingerprint_hash = value;
break;
case sExposeAuthInfo:
intptr = &options->expose_userauth_info;
goto parse_flag;
case sRDomain:
#if !defined(__OpenBSD__) && !defined(HAVE_SYS_SET_PROCESS_RDOMAIN)
fatal("%s line %d: setting RDomain not supported on this "
"platform.", filename, linenum);
#endif
charptr = &options->routing_domain;
arg = argv_next(&ac, &av);
if (!arg || *arg == '\0')
fatal("%s line %d: %s missing argument.",
filename, linenum, keyword);
if (strcasecmp(arg, "none") != 0 && strcmp(arg, "%D") != 0 &&
!valid_rdomain(arg))
fatal("%s line %d: invalid routing domain",
filename, linenum);
if (*activep && *charptr == NULL)
*charptr = xstrdup(arg);
break;
case sRequiredRSASize:
intptr = &options->required_rsa_size;
goto parse_int;
case sChannelTimeout:
found = options->num_channel_timeouts == 0;
while ((arg = argv_next(&ac, &av)) != NULL) {
/* Allow "none" only in first position */
if (strcasecmp(arg, "none") == 0) {
if (nstrs > 0 || ac > 0) {
error("%s line %d: keyword %s \"none\" "
"argument must appear alone.",
filename, linenum, keyword);
goto out;
}
} else if (parse_pattern_interval(arg,
NULL, NULL) != 0) {
fatal("%s line %d: invalid channel timeout %s",
filename, linenum, arg);
}
opt_array_append(filename, linenum, keyword,
&strs, &nstrs, arg);
}
if (nstrs == 0) {
fatal("%s line %d: no %s specified",
filename, linenum, keyword);
}
if (found && *activep) {
options->channel_timeouts = strs;
options->num_channel_timeouts = nstrs;
strs = NULL; /* transferred */
nstrs = 0;
}
break;
case sUnusedConnectionTimeout:
intptr = &options->unused_connection_timeout;
/* peek at first arg for "none" so we can reuse parse_time */
if (av[0] != NULL && strcasecmp(av[0], "none") == 0) {
(void)argv_next(&ac, &av); /* consume arg */
if (*activep)
*intptr = 0;
break;
}
goto parse_time;
case sSshdSessionPath:
charptr = &options->sshd_session_path;
goto parse_filename;
case sSshdAuthPath:
charptr = &options->sshd_auth_path;
goto parse_filename;
case sRefuseConnection:
intptr = &options->refuse_connection;
multistate_ptr = multistate_flag;
goto parse_multistate;
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",
keyword);
argv_consume(&ac);
break;
default:
fatal("%s line %d: Missing handler for opcode %s (%d)",
filename, linenum, keyword, opcode);
}
/* Check that there is no garbage at end of line. */
if (ac > 0) {
error("%.200s line %d: keyword %s extra arguments "
"at end of line", filename, linenum, keyword);
goto out;
}
/* success */
ret = 0;
out:
opt_array_free2(strs, NULL, nstrs);
argv_free(oav, oac);
return ret;
}
int
process_server_config_line(ServerOptions *options, char *line,
const char *filename, int linenum, int *activep,
struct connection_info *connectinfo, struct include_list *includes)
{
int inc_flags = 0;
return process_server_config_line_depth(options, line, filename,
linenum, activep, connectinfo, &inc_flags, 0, includes);
}
/* Reads the server configuration file. */
void
load_server_config(const char *filename, struct sshbuf *conf)
{
struct stat st;
char *line = NULL, *cp;
size_t linesize = 0;
FILE *f;
int r;
debug2_f("filename %s", filename);
if ((f = fopen(filename, "r")) == NULL) {
perror(filename);
exit(1);
}
sshbuf_reset(conf);
/* grow buffer, so realloc is avoided for large config files */
if (fstat(fileno(f), &st) == 0 && st.st_size > 0 &&
(r = sshbuf_allocate(conf, st.st_size)) != 0)
fatal_fr(r, "allocate");
while (getline(&line, &linesize, f) != -1) {
/*
* Strip whitespace
* NB - preserve newlines, they are needed to reproduce
* line numbers later for error messages
*/
cp = line + strspn(line, " \t\r");
if ((r = sshbuf_put(conf, cp, strlen(cp))) != 0)
fatal_fr(r, "sshbuf_put");
}
free(line);
if ((r = sshbuf_put_u8(conf, 0)) != 0)
fatal_fr(r, "sshbuf_put_u8");
fclose(f);
debug2_f("done config len = %zu", sshbuf_len(conf));
}
void
parse_server_match_config(ServerOptions *options,
struct include_list *includes, struct connection_info *connectinfo)
{
ServerOptions mo;
initialize_server_options(&mo);
parse_server_config(&mo, "reprocess config", cfg, includes,
connectinfo, 0);
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 if (strcmp(p, "invalid-user") == 0) {
ci->user_invalid = 1;
} else {
fprintf(stderr, "Invalid test mode specification %s\n",
p);
return -1;
}
}
return 0;
}
void
servconf_merge_subsystems(ServerOptions *dst, ServerOptions *src)
{
u_int i, j, found;
for (i = 0; i < src->num_subsystems; i++) {
found = 0;
for (j = 0; j < dst->num_subsystems; j++) {
if (strcmp(src->subsystem_name[i],
dst->subsystem_name[j]) == 0) {
found = 1;
break;
}
}
if (found) {
debug_f("override \"%s\"", dst->subsystem_name[j]);
free(dst->subsystem_command[j]);
free(dst->subsystem_args[j]);
dst->subsystem_command[j] =
xstrdup(src->subsystem_command[i]);
dst->subsystem_args[j] =
xstrdup(src->subsystem_args[i]);
continue;
}
debug_f("add \"%s\"", src->subsystem_name[i]);
dst->subsystem_name = xrecallocarray(
dst->subsystem_name, dst->num_subsystems,
dst->num_subsystems + 1, sizeof(*dst->subsystem_name));
dst->subsystem_command = xrecallocarray(
dst->subsystem_command, dst->num_subsystems,
dst->num_subsystems + 1, sizeof(*dst->subsystem_command));
dst->subsystem_args = xrecallocarray(
dst->subsystem_args, dst->num_subsystems,
dst->num_subsystems + 1, sizeof(*dst->subsystem_args));
j = dst->num_subsystems++;
dst->subsystem_name[j] = xstrdup(src->subsystem_name[i]);
dst->subsystem_command[j] = xstrdup(src->subsystem_command[i]);
dst->subsystem_args[j] = xstrdup(src->subsystem_args[i]);
}
}
/*
* 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(pubkey_auth_options);
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(ignore_rhosts);
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);
M_CP_INTOPT(required_rsa_size);
M_CP_INTOPT(unused_connection_timeout);
M_CP_INTOPT(refuse_connection);
/*
* 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;
}
/* Subsystems require merging. */
servconf_merge_subsystems(dst, src);
}
#undef M_CP_INTOPT
#undef M_CP_STROPT
#undef M_CP_STRARRAYOPT
#define SERVCONF_MAX_DEPTH 16
static void
parse_server_config_depth(ServerOptions *options, const char *filename,
struct sshbuf *conf, struct include_list *includes,
struct connection_info *connectinfo, int flags, int *activep, int depth)
{
int linenum, bad_options = 0;
char *cp, *obuf, *cbuf;
if (depth < 0 || depth > SERVCONF_MAX_DEPTH)
fatal("Too many recursive configuration includes");
debug2_f("config %s len %zu%s", filename, sshbuf_len(conf),
(flags & SSHCFG_NEVERMATCH ? " [checking syntax only]" : ""));
if ((obuf = cbuf = sshbuf_dup_string(conf)) == NULL)
fatal_f("sshbuf_dup_string failed");
linenum = 1;
while ((cp = strsep(&cbuf, "\n")) != NULL) {
if (process_server_config_line_depth(options, cp,
filename, linenum++, activep, connectinfo, &flags,
depth, includes) != 0)
bad_options++;
}
free(obuf);
if (bad_options > 0)
fatal("%s: terminating, %d bad configuration options",
filename, bad_options);
}
void
parse_server_config(ServerOptions *options, const char *filename,
struct sshbuf *conf, struct include_list *includes,
struct connection_info *connectinfo, int reexec)
{
int active = connectinfo ? 0 : 1;
parse_server_config_depth(options, filename, conf, includes,
connectinfo, (connectinfo ? SSHCFG_MATCH_ONLY : 0), &active, 0);
if (!reexec)
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 sIgnoreRhosts:
return fmt_multistate_int(val, multistate_ignore_rhosts);
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)
{
if (code == sUnusedConnectionTimeout && val == 0) {
printf("%s none\n", lookup_opcode_name(code));
return;
}
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;
switch (code) {
case sAuthenticationMethods:
case sChannelTimeout:
break;
default:
if (count <= 0)
return;
break;
}
printf("%s", lookup_opcode_name(code));
for (i = 0; i < count; i++)
printf(" %s", vals[i]);
if (code == sAuthenticationMethods && count == 0)
printf(" any");
else if (code == sChannelTimeout && count == 0)
printf(" none");
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);
dump_cfg_string(sPAMServiceName, o->pam_service_name);
#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_int(sRequiredRSASize, o->required_rsa_size);
dump_cfg_oct(sStreamLocalBindMask, o->fwd_opts.streamlocal_bind_mask);
dump_cfg_int(sUnusedConnectionTimeout, o->unused_connection_timeout);
/* 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(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);
dump_cfg_fmtint(sRefuseConnection, o->refuse_connection);
/* string arguments */
dump_cfg_string(sPidFile, o->pid_file);
dump_cfg_string(sModuliFile, o->moduli_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(sSecurityKeyProvider, o->sk_provider);
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);
dump_cfg_string(sCASignatureAlgorithms, o->ca_sign_algorithms);
dump_cfg_string(sHostbasedAcceptedAlgorithms, o->hostbased_accepted_algos);
dump_cfg_string(sHostKeyAlgorithms, o->hostkeyalgorithms);
dump_cfg_string(sPubkeyAcceptedAlgorithms, o->pubkey_accepted_algos);
#if defined(__OpenBSD__) || defined(HAVE_SYS_SET_PROCESS_RDOMAIN)
dump_cfg_string(sRDomain, o->routing_domain);
#endif
dump_cfg_string(sSshdSessionPath, o->sshd_session_path);
dump_cfg_string(sSshdAuthPath, o->sshd_auth_path);
dump_cfg_string(sPerSourcePenaltyExemptList, o->per_source_penalty_exempt);
/* 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);
dump_cfg_strarray_oneline(sLogVerbose,
o->num_log_verbose, o->log_verbose);
dump_cfg_strarray_oneline(sChannelTimeout,
o->num_channel_timeouts, o->channel_timeouts);
/* 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);
printf("persourcemaxstartups ");
if (o->per_source_max_startups == INT_MAX)
printf("none\n");
else
printf("%d\n", o->per_source_max_startups);
printf("persourcenetblocksize %d:%d\n", o->per_source_masklen_ipv4,
o->per_source_masklen_ipv6);
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_allowlist == NULL) {
dump_cfg_fmtint(sPermitUserEnvironment, o->permit_user_env);
} else {
printf("permituserenvironment %s\n",
o->permit_user_env_allowlist);
}
printf("pubkeyauthoptions");
if (o->pubkey_auth_options == 0)
printf(" none");
if (o->pubkey_auth_options & PUBKEYAUTH_TOUCH_REQUIRED)
printf(" touch-required");
if (o->pubkey_auth_options & PUBKEYAUTH_VERIFY_REQUIRED)
printf(" verify-required");
printf("\n");
if (o->per_source_penalty.enabled) {
printf("persourcepenalties crash:%d authfail:%d noauth:%d "
"grace-exceeded:%d refuseconnection:%d max:%d min:%d "
"max-sources4:%d max-sources6:%d "
"overflow:%s overflow6:%s\n",
o->per_source_penalty.penalty_crash,
o->per_source_penalty.penalty_authfail,
o->per_source_penalty.penalty_noauth,
o->per_source_penalty.penalty_grace,
o->per_source_penalty.penalty_refuseconnection,
o->per_source_penalty.penalty_max,
o->per_source_penalty.penalty_min,
o->per_source_penalty.max_sources4,
o->per_source_penalty.max_sources6,
o->per_source_penalty.overflow_mode ==
PER_SOURCE_PENALTY_OVERFLOW_DENY_ALL ?
"deny-all" : "permissive",
o->per_source_penalty.overflow_mode6 ==
PER_SOURCE_PENALTY_OVERFLOW_DENY_ALL ?
"deny-all" : "permissive");
} else
printf("persourcepenalties no\n");
}
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