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upstream: handle compiled-time unsupported options in servconf.h

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better; leave a zero placeholder variable so we don't have #ifdef around
their absence elsehwere in the tree

OpenBSD-Commit-ID: 9601de2c67042aacb0ea12ca424e67c092fa7801
This commit is contained in:
djm@openbsd.org
2026-05-31 13:12:07 +00:00
committed by Damien Miller
parent ea91c7a1a9
commit 58b9381e0b
2 changed files with 120 additions and 59 deletions
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91
servconf.c
View File

@@ -95,7 +95,9 @@ initialize_server_options(ServerOptions *options)
init_##funcsuffix(options)
#define SSHCONF_NONCONF(funcsuffix) \
init_##funcsuffix(options)
#define SSHCONF_NOSUPPORT(var, conf, opcode, flags) /* empty */
#define SSHCONF_DEPRECATE(conf, flags, opcode) /* empty */
#define SSHCONF_UNSUPPORTED_INT(var, conf, flags) options->var = 0;
#define SSHCONF_UNSUPPORTED_STRING(var, conf, flags) options->var = NULL;
#define SSHCONF_ALIAS(old, conf, flags) /* empty */
/* Using macros for these is a bit overkill but forces consistency */
@@ -184,7 +186,9 @@ initialize_server_options(ServerOptions *options)
#undef SSHCONF_STRARRAY
#undef SSHCONF_CUSTOM
#undef SSHCONF_NONCONF
#undef SSHCONF_NOSUPPORT
#undef SSHCONF_DEPRECATE
#undef SSHCONF_UNSUPPORTED_INT
#undef SSHCONF_UNSUPPORTED_STRING
#undef SSHCONF_ALIAS
}
@@ -276,7 +280,13 @@ fill_default_server_options(ServerOptions *options)
#define SSHCONF_STRARRAY(var, nvar, conf, flags, cp) /* done manually */
#define SSHCONF_CUSTOM(conf, funcsuffix, flags, cp) /* done manually */
#define SSHCONF_NONCONF(funcsuffix) /* done manually */
#define SSHCONF_NOSUPPORT(var, conf, opcode, flags) /* empty */
#define SSHCONF_DEPRECATE(conf, flags, opcode) /* empty */
#define SSHCONF_UNSUPPORTED_INT(var, conf, flags) options->var = 0;
#define SSHCONF_UNSUPPORTED_STRING(var, conf, flags) \
do { \
free(options->var); \
options->var = NULL; \
} while (0);
#define SSHCONF_ALIAS(old, conf, flags) /* empty */
/* XXX maybe use macros here too to force consistency? */
@@ -289,9 +299,16 @@ fill_default_server_options(ServerOptions *options)
#undef SSHCONF_STRARRAY
#undef SSHCONF_CUSTOM
#undef SSHCONF_NONCONF
#undef SSHCONF_NOSUPPORT
#undef SSHCONF_DEPRECATE
#undef SSHCONF_UNSUPPORTED_INT
#undef SSHCONF_UNSUPPORTED_STRING
#undef SSHCONF_ALIAS
#ifdef USE_PAM
if (options->pam_service_name == NULL)
options->pam_service_name = xstrdup(SSHD_PAM_SERVICE);
#endif
if (options->num_host_key_files == 0) {
/* fill default hostkeys */
servconf_add_hostkey("[default]", 0, options,
@@ -442,7 +459,9 @@ fill_default_server_options(ServerOptions *options)
#define SSHCONF_STRARRAY(var, nvar, conf, flags, cp) s##conf,
#define SSHCONF_CUSTOM(conf, funcsuffix, flags, cp) s##conf,
#define SSHCONF_NONCONF(funcsuffix) /* empty */
#define SSHCONF_NOSUPPORT(var, conf, opcode, flags) /* empty */
#define SSHCONF_DEPRECATE(conf, flags, opcode) /* empty */
#define SSHCONF_UNSUPPORTED_INT(var, conf, flags) /* empty */
#define SSHCONF_UNSUPPORTED_STRING(var, conf, flags) /* empty */
#define SSHCONF_ALIAS(old, conf, flags) /* empty */
/* Keyword tokens. */
@@ -458,7 +477,9 @@ typedef enum {
#undef SSHCONF_STRARRAY
#undef SSHCONF_CUSTOM
#undef SSHCONF_NONCONF
#undef SSHCONF_NOSUPPORT
#undef SSHCONF_DEPRECATE
#undef SSHCONF_UNSUPPORTED_INT
#undef SSHCONF_UNSUPPORTED_STRING
#undef SSHCONF_ALIAS
#define SSHCFG_GLOBAL 0x01 /* allowed in main section of config */
@@ -477,9 +498,12 @@ typedef enum {
#define SSHCONF_NONCONF(funcsuffix) /* empty */
#define SSHCONF_DEPRECATED sDeprecated
#define SSHCONF_IGNORE sIgnore
#define SSHCONF_UNSUPPORTED sUnsupported
#define SSHCONF_NOSUPPORT(var, conf, opcode, flags) \
#define SSHCONF_DEPRECATE(conf, flags, opcode) \
{ #conf, opcode, flags },
#define SSHCONF_UNSUPPORTED_INT(var, conf, flags) \
{ #conf, sUnsupported, flags },
#define SSHCONF_UNSUPPORTED_STRING(var, conf, flags) \
{ #conf, sUnsupported, flags },
#define SSHCONF_ALIAS(old, conf, flags) \
{ #old, s##conf, flags },
@@ -502,8 +526,9 @@ static struct {
#undef SSHCONF_NONCONF
#undef SSHCONF_DEPRECATED
#undef SSHCONF_IGNORE
#undef SSHCONF_UNSUPPORTED
#undef SSHCONF_NOSUPPORT
#undef SSHCONF_DEPRECATE
#undef SSHCONF_UNSUPPORTED_INT
#undef SSHCONF_UNSUPPORTED_STRING
#undef SSHCONF_ALIAS
static struct {
@@ -1143,7 +1168,7 @@ process_server_config_line_depth(ServerOptions *options, char *line,
switch (opcode) {
/* Portable-specific options */
#ifdef WITH_PAM
#ifdef USE_PAM
case sUsePAM:
intptr = &options->use_pam;
goto parse_flag;
@@ -3080,7 +3105,9 @@ serialise_server_options(const ServerOptions *options, struct sshbuf **bufp)
#define SSHCONF_NONCONF(funcsuffix) \
if ((r = serialise_##funcsuffix(options, buf)) != 0) \
goto out;
#define SSHCONF_NOSUPPORT(var, conf, opcode, flags) /* empty */
#define SSHCONF_DEPRECATE(conf, flags, opcode) /* empty */
#define SSHCONF_UNSUPPORTED_INT(var, conf, flags) /* empty */
#define SSHCONF_UNSUPPORTED_STRING(var, conf, flags) /* empty */
#define SSHCONF_ALIAS(old, conf, flags) /* empty */
SSHD_CONFIG_ENTRIES
@@ -3091,7 +3118,9 @@ serialise_server_options(const ServerOptions *options, struct sshbuf **bufp)
#undef SSHCONF_STRARRAY
#undef SSHCONF_CUSTOM
#undef SSHCONF_NONCONF
#undef SSHCONF_NOSUPPORT
#undef SSHCONF_DEPRECATE
#undef SSHCONF_UNSUPPORTED_INT
#undef SSHCONF_UNSUPPORTED_STRING
#undef SSHCONF_ALIAS
/* success */
@@ -3611,7 +3640,13 @@ deserialise_server_options(struct sshbuf *buf, ServerOptions *options)
#define SSHCONF_NONCONF(funcsuffix) \
if ((r = deserialise_##funcsuffix(&new_options, buf)) != 0) \
goto out;
#define SSHCONF_NOSUPPORT(var, conf, opcode, flags) /* empty */
#define SSHCONF_DEPRECATE(conf, flags, opcode) /* empty */
#define SSHCONF_UNSUPPORTED_INT(var, conf, flags) new_options.var = 0;
#define SSHCONF_UNSUPPORTED_STRING(var, conf, flags) \
do { \
free(new_options.var); \
new_options.var = NULL; \
} while (0);
#define SSHCONF_ALIAS(old, conf, flags) /* empty */
SSHD_CONFIG_ENTRIES
@@ -3628,7 +3663,9 @@ deserialise_server_options(struct sshbuf *buf, ServerOptions *options)
#undef SSHCONF_STRARRAY
#undef SSHCONF_CUSTOM
#undef SSHCONF_NONCONF
#undef SSHCONF_NOSUPPORT
#undef SSHCONF_DEPRECATE
#undef SSHCONF_UNSUPPORTED_INT
#undef SSHCONF_UNSUPPORTED_STRING
#undef SSHCONF_ALIAS
/* success */
@@ -3701,7 +3738,13 @@ free_server_options(ServerOptions *options)
free_##funcsuffix(options);
#define SSHCONF_NONCONF(funcsuffix) \
free_##funcsuffix(options);
#define SSHCONF_NOSUPPORT(var, conf, opcode, flags) /* empty */
#define SSHCONF_DEPRECATE(conf, flags, opcode) /* empty */
#define SSHCONF_UNSUPPORTED_INT(var, conf, flags) options->var = 0;
#define SSHCONF_UNSUPPORTED_STRING(var, conf, flags) \
do { \
free(options->var); \
options->var = NULL; \
} while (0);
#define SSHCONF_ALIAS(old, conf, flags) /* empty */
#define free_ipqos(options)
@@ -3738,7 +3781,9 @@ free_server_options(ServerOptions *options)
#undef SSHCONF_STRARRAY
#undef SSHCONF_CUSTOM
#undef SSHCONF_NONCONF
#undef SSHCONF_NOSUPPORT
#undef SSHCONF_DEPRECATE
#undef SSHCONF_UNSUPPORTED_INT
#undef SSHCONF_UNSUPPORTED_STRING
#undef SSHCONF_ALIAS
initialize_server_options(options);
@@ -3869,7 +3914,13 @@ copy_set_server_options(ServerOptions *dst, ServerOptions *src, int preauth)
#define SSHCONF_CUSTOM(conf, funcsuffix, flags, cp) \
cp(copy_##funcsuffix(dst, src);)
#define SSHCONF_NONCONF(funcsuffix) /* empty */
#define SSHCONF_NOSUPPORT(var, conf, opcode, flags) /* empty */
#define SSHCONF_DEPRECATE(conf, flags, opcode) /* empty */
#define SSHCONF_UNSUPPORTED_INT(var, conf, flags) dst->var = 0;
#define SSHCONF_UNSUPPORTED_STRING(var, conf, flags) \
do { \
free(dst->var); \
dst->var = NULL; \
} while (0);
#define SSHCONF_ALIAS(old, conf, flags) /* empty */
SSHD_CONFIG_ENTRIES
@@ -3880,7 +3931,9 @@ copy_set_server_options(ServerOptions *dst, ServerOptions *src, int preauth)
#undef SSHCONF_STRARRAY
#undef SSHCONF_CUSTOM
#undef SSHCONF_NONCONF
#undef SSHCONF_NOSUPPORT
#undef SSHCONF_DEPRECATE
#undef SSHCONF_UNSUPPORTED_INT
#undef SSHCONF_UNSUPPORTED_STRING
#undef SSHCONF_ALIAS
/*

88
servconf.h
View File

@@ -117,8 +117,10 @@ struct per_source_penalty {
* their corresponding variable definitions in ServerOptions. The integer
* options also include defaults for initialisation.
*
* Unsupported, deprecated and ignored options use SSHCONF_NOSUPPORT and
* don't populate ServerOptions. Deprecated aliases that still work use
* Deprecated and ignored options use SSHCONF_DEPRECATE and don't populate
* ServerOptions. Unsupported options use SSHCONF_UNSUPPORTED_INT or
* SSHCONF_UNSUPPORTED_STRING to populate placeholders in ServerOptions that
* are not otherwise used. Deprecated aliases that still work use
* SSHCONF_ALIAS.
*
* Why go to all this trouble? It ensures a level of consistency between
@@ -133,7 +135,9 @@ struct per_source_penalty {
* SSHCONF_STRARRAY(field, nfield, keyword, scope, copy)
* SSHCONF_CUSTOM(keyword, suffix, scope, copy)
* SSHCONF_NONCONF(suffix)
* SSHCONF_NOSUPPORT(field, keyword, token, scope)
* SSHCONF_DEPRECATE(keyword, scope, token)
* SSHCONF_UNSUPPORTED_INT(field, keyword, scope)
* SSHCONF_UNSUPPORTED_STRING(field, keyword, scope)
* SSHCONF_ALIAS(old_keyword, keyword, scope)
*/
#define SSHD_CONFIG_ENTRIES_CUSTOM \
@@ -234,18 +238,20 @@ SSHCONF_STRING(sshd_auth_path, SshdAuthPath, SSHCFG_GLOBAL, SSHCFG_COPY_NONE) \
SSHCONF_INTFLAG(refuse_connection, RefuseConnection, SSHCFG_ALL, 0, SSHCFG_COPY_MATCH)
#define SSHD_CONFIG_ENTRIES_LEGACY \
SSHCONF_NOSUPPORT(server_key_bits, ServerKeyBits, SSHCONF_DEPRECATED, SSHCFG_GLOBAL) \
SSHCONF_NOSUPPORT(key_regeneration_interval, KeyRegenerationInterval, SSHCONF_DEPRECATED, SSHCFG_GLOBAL) \
SSHCONF_NOSUPPORT(rhosts_authentication, RHostsAuthentication, SSHCONF_DEPRECATED, SSHCFG_GLOBAL) \
SSHCONF_NOSUPPORT(rhosts_rsa_authentication, RhostsRSAAuthentication, SSHCONF_DEPRECATED, SSHCFG_ALL) \
SSHCONF_NOSUPPORT(rsa_authentication, RSAAuthentication, SSHCONF_DEPRECATED, SSHCFG_ALL) \
SSHCONF_NOSUPPORT(check_mail, CheckMail, SSHCONF_DEPRECATED, SSHCFG_GLOBAL) \
SSHCONF_NOSUPPORT(use_login, UseLogin, SSHCONF_DEPRECATED, SSHCFG_GLOBAL) \
SSHCONF_NOSUPPORT(verify_reverse_mapping, VerifyReverseMapping, SSHCONF_DEPRECATED, SSHCFG_GLOBAL) \
SSHCONF_NOSUPPORT(reverse_mapping_check, ReverseMappingCheck, SSHCONF_DEPRECATED, SSHCFG_GLOBAL) \
SSHCONF_NOSUPPORT(authorized_keys_file2, AuthorizedKeysFile2, SSHCONF_DEPRECATED, SSHCFG_ALL) \
SSHCONF_NOSUPPORT(use_privilege_separation, UsePrivilegeSeparation, SSHCONF_DEPRECATED, SSHCFG_GLOBAL) \
SSHCONF_NOSUPPORT(protocol, Protocol, SSHCONF_IGNORE, SSHCFG_GLOBAL)
SSHCONF_DEPRECATE(ServerKeyBits, SSHCFG_GLOBAL, SSHCONF_DEPRECATED) \
SSHCONF_DEPRECATE(KeyRegenerationInterval, SSHCFG_GLOBAL, SSHCONF_DEPRECATED) \
SSHCONF_DEPRECATE(RHostsAuthentication, SSHCFG_GLOBAL, SSHCONF_DEPRECATED) \
SSHCONF_DEPRECATE(RhostsRSAAuthentication, SSHCFG_ALL, SSHCONF_DEPRECATED) \
SSHCONF_DEPRECATE(RSAAuthentication, SSHCFG_ALL, SSHCONF_DEPRECATED) \
SSHCONF_DEPRECATE(CheckMail, SSHCFG_GLOBAL, SSHCONF_DEPRECATED) \
SSHCONF_DEPRECATE(UseLogin, SSHCFG_GLOBAL, SSHCONF_DEPRECATED) \
SSHCONF_DEPRECATE(VerifyReverseMapping, SSHCFG_GLOBAL, SSHCONF_DEPRECATED) \
SSHCONF_DEPRECATE(ReverseMappingCheck, SSHCFG_GLOBAL, SSHCONF_DEPRECATED) \
SSHCONF_DEPRECATE(AuthorizedKeysFile2, SSHCFG_ALL, SSHCONF_DEPRECATED) \
SSHCONF_DEPRECATE(UsePrivilegeSeparation, SSHCFG_GLOBAL, SSHCONF_DEPRECATED) \
SSHCONF_DEPRECATE(KerberosTgtPassing, SSHCFG_GLOBAL, SSHCONF_DEPRECATED) \
SSHCONF_DEPRECATE(AFSTokenPassing, SSHCFG_GLOBAL, SSHCONF_DEPRECATED) \
SSHCONF_DEPRECATE(Protocol, SSHCFG_GLOBAL, SSHCONF_IGNORE)
#define SSHD_CONFIG_ENTRIES_ALIASES \
SSHCONF_ALIAS(HostDSAKey, HostKey, SSHCFG_GLOBAL) \
@@ -261,11 +267,22 @@ SSHCONF_ALIAS(KeepAlive, TCPKeepAlive, SSHCFG_GLOBAL)
SSHD_CONFIG_ENTRIES_MAIN \
SSHD_CONFIG_ENTRIES_LEGACY \
SSHD_CONFIG_ENTRIES_ALIASES \
SSHD_CONFIG_ENTRIES_PAM \
SSHD_CONFIG_ENTRIES_LASTLOG
#ifdef USE_PAM
#define SSHD_CONFIG_ENTRIES_PAM \
SSHCONF_INTFLAG(use_pam, UsePAM, SSHCFG_GLOBAL, 0, SSHCFG_COPY_NONE) \
SSHCONF_STRING(pam_service_name, PAMServiceName, SSHCFG_GLOBAL, SSHCFG_COPY_NONE)
#else
#define SSHD_CONFIG_ENTRIES_PAM \
SSHCONF_UNSUPPORTED_INT(use_pam, UsePAM, SSHCFG_GLOBAL) \
SSHCONF_UNSUPPORTED_STRING(pam_service_name, PAMServiceName, SSHCFG_GLOBAL)
#endif
#ifdef DISABLE_LASTLOG
#define SSHD_CONFIG_ENTRIES_LASTLOG \
SSHCONF_NOSUPPORT(print_lastlog, PrintLastLog, SSHCONF_UNSUPPORTED, SSHCFG_GLOBAL)
SSHCONF_UNSUPPORTED_INT(print_lastlog, PrintLastLog, SSHCFG_GLOBAL)
#else
#define SSHD_CONFIG_ENTRIES_LASTLOG \
SSHCONF_INTFLAG(print_lastlog, PrintLastLog, SSHCFG_GLOBAL, 1, SSHCFG_COPY_NONE)
@@ -279,7 +296,7 @@ SSHCONF_INTFLAG(print_lastlog, PrintLastLog, SSHCFG_GLOBAL, 1, SSHCFG_COPY_NONE)
SSHCONF_INTFLAG(kerberos_get_afs_token, KerberosGetAFSToken, SSHCFG_GLOBAL, 0, SSHCFG_COPY_NONE)
#else /* USE_AFS */
#define SSHD_CONFIG_KRB5_AFS \
SSHCONF_NOSUPPORT(kerberos_get_afs_token, KerberosGetAFSToken, SSHCONF_UNSUPPORTED, SSHCFG_GLOBAL)
SSHCONF_UNSUPPORTED_INT(kerberos_get_afs_token, KerberosGetAFSToken, SSHCFG_GLOBAL)
#endif /* USE_AFS */
#define SSHD_CONFIG_ENTRIES_KRB5 \
@@ -289,12 +306,10 @@ SSHCONF_INTFLAG(kerberos_ticket_cleanup, KerberosTicketCleanup, SSHCFG_GLOBAL, 1
SSHD_CONFIG_KRB5_AFS
#else /* KRB5 */
#define SSHD_CONFIG_ENTRIES_KRB5 \
SSHCONF_NOSUPPORT(kerberos_authentication, KerberosAuthentication, SSHCONF_UNSUPPORTED, SSHCFG_ALL) \
SSHCONF_NOSUPPORT(kerberos_or_local_passwd, KerberosOrLocalPasswd, SSHCONF_UNSUPPORTED, SSHCFG_GLOBAL) \
SSHCONF_NOSUPPORT(kerberos_ticket_cleanup, KerberosTicketCleanup, SSHCONF_UNSUPPORTED, SSHCFG_GLOBAL) \
SSHCONF_NOSUPPORT(kerberos_get_afs_token, KerberosGetAFSToken, SSHCONF_UNSUPPORTED, SSHCFG_GLOBAL) \
SSHCONF_NOSUPPORT(kerberos_tgt_passing, KerberosTgtPassing, SSHCONF_UNSUPPORTED, SSHCFG_GLOBAL) \
SSHCONF_NOSUPPORT(afs_token_passing, AFSTokenPassing, SSHCONF_UNSUPPORTED, SSHCFG_GLOBAL)
SSHCONF_UNSUPPORTED_INT(kerberos_authentication, KerberosAuthentication, SSHCFG_ALL) \
SSHCONF_UNSUPPORTED_INT(kerberos_or_local_passwd, KerberosOrLocalPasswd, SSHCFG_GLOBAL) \
SSHCONF_UNSUPPORTED_INT(kerberos_ticket_cleanup, KerberosTicketCleanup, SSHCFG_GLOBAL) \
SSHCONF_UNSUPPORTED_INT(kerberos_get_afs_token, KerberosGetAFSToken, SSHCFG_GLOBAL)
#endif /* KRB5 */
#ifdef GSSAPI
@@ -305,10 +320,10 @@ SSHCONF_INTFLAG(gss_deleg_creds, GssDelegateCreds, SSHCFG_GLOBAL, 1, SSHCFG_COPY
SSHCONF_INTFLAG(gss_strict_acceptor, GssStrictAcceptor, SSHCFG_GLOBAL, 1, SSHCFG_COPY_NONE)
#else /* GSSAPI */
#define SSHD_CONFIG_ENTRIES_GSS \
SSHCONF_NOSUPPORT(gss_authentication, GssAuthentication, SSHCONF_UNSUPPORTED, SSHCFG_ALL) \
SSHCONF_NOSUPPORT(gss_cleanup_creds, GssCleanupCreds, SSHCONF_UNSUPPORTED, SSHCFG_GLOBAL) \
SSHCONF_NOSUPPORT(gss_deleg_creds, GssDelegateCreds, SSHCONF_UNSUPPORTED, SSHCFG_GLOBAL) \
SSHCONF_NOSUPPORT(gss_strict_acceptor, GssStrictAcceptor, SSHCONF_UNSUPPORTED, SSHCFG_GLOBAL)
SSHCONF_UNSUPPORTED_INT(gss_authentication, GssAuthentication, SSHCFG_ALL) \
SSHCONF_UNSUPPORTED_INT(gss_cleanup_creds, GssCleanupCreds, SSHCFG_GLOBAL) \
SSHCONF_UNSUPPORTED_INT(gss_deleg_creds, GssDelegateCreds, SSHCFG_GLOBAL) \
SSHCONF_UNSUPPORTED_INT(gss_strict_acceptor, GssStrictAcceptor, SSHCFG_GLOBAL)
#endif /* GSSAPI */
#define SSHD_CONFIG_ENTRIES \
@@ -325,7 +340,9 @@ SSHCONF_NOSUPPORT(gss_strict_acceptor, GssStrictAcceptor, SSHCONF_UNSUPPORTED, S
u_int nvar;
#define SSHCONF_CUSTOM(conf, funcsuffix, flags, cp) /* empty */
#define SSHCONF_NONCONF(funcsuffix) /* empty */
#define SSHCONF_NOSUPPORT(var, conf, opcode, flags) /* empty */
#define SSHCONF_DEPRECATE(conf, flags, opcode) /* empty */
#define SSHCONF_UNSUPPORTED_INT(var, conf, flags) int var;
#define SSHCONF_UNSUPPORTED_STRING(var, conf, flags) char *var;
#define SSHCONF_ALIAS(old, conf, flags) /* empty */
typedef struct ServerOptions {
@@ -374,17 +391,6 @@ typedef struct ServerOptions {
int rekey_interval;
/* Passed by config but not keyword for this */
uint64_t timing_secret;
/* Placeholders for compile-time disabled things */
/* XXX djm redo macros to remove these */
#ifndef WITH_PAM
int use_pam;
#endif
#ifdef DISABLE_LASTLOG
int print_lastlog;
#endif
#ifndef KRB5
int kerberos_authentication;
#endif
} ServerOptions;
#undef SSHCONF_INT
#undef SSHCONF_INTFLAG
@@ -392,7 +398,9 @@ typedef struct ServerOptions {
#undef SSHCONF_STRARRAY
#undef SSHCONF_CUSTOM
#undef SSHCONF_NONCONF
#undef SSHCONF_NOSUPPORT
#undef SSHCONF_DEPRECATE
#undef SSHCONF_UNSUPPORTED_INT
#undef SSHCONF_UNSUPPORTED_STRING
#undef SSHCONF_ALIAS
/* Information about the incoming connection as used by Match */