[gssapi-openssh.git] / openssh / auth2.c

/*
 * Copyright (c) 2000 Markus Friedl.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "includes.h"
RCSID("$OpenBSD: auth2.c,v 1.93 2002/05/31 11:35:15 markus Exp $");

#include "ssh2.h"
#include "ssh1.h"
#include "xmalloc.h"
#include "packet.h"
#include "log.h"
#include "servconf.h"
#include "compat.h"
#include "auth.h"
#include "dispatch.h"
#include "pathnames.h"
#include "monitor_wrap.h"

#ifdef GSSAPI
#include "ssh-gss.h"
#endif

/* import */
extern ServerOptions options;
extern u_char *session_id2;
extern int session_id2_len;

Authctxt *x_authctxt = NULL;

/* methods */

extern Authmethod method_none;
#ifdef GSSAPI
extern Authmethod method_external;
extern Authmethod method_gssapi;
#endif
extern Authmethod method_pubkey;
extern Authmethod method_passwd;
extern Authmethod method_kbdint;
extern Authmethod method_hostbased;

Authmethod *authmethods[] = {
	&method_none,
#ifdef GSSAPI
	&method_external,
	&method_gssapi,
#endif
	&method_pubkey,
	&method_passwd,
	&method_kbdint,
	&method_hostbased,
	NULL
};

/* protocol */

static void input_service_request(int, u_int32_t, void *);
static void input_userauth_request(int, u_int32_t, void *);

/* helper */
static Authmethod *authmethod_lookup(const char *);
static char *authmethods_get(void);
int user_key_allowed(struct passwd *, Key *);
int hostbased_key_allowed(struct passwd *, const char *, char *, Key *);

/*
 * loop until authctxt->success == TRUE
 */

Authctxt *
do_authentication2(void)
{
	Authctxt *authctxt = authctxt_new();

	x_authctxt = authctxt;		/*XXX*/

	/* challenge-response is implemented via keyboard interactive */
	if (options.challenge_response_authentication)
		options.kbd_interactive_authentication = 1;
	if (options.pam_authentication_via_kbd_int)
		options.kbd_interactive_authentication = 1;
	if (use_privsep)
		options.pam_authentication_via_kbd_int = 0;

	dispatch_init(&dispatch_protocol_error);
	dispatch_set(SSH2_MSG_SERVICE_REQUEST, &input_service_request);
	dispatch_run(DISPATCH_BLOCK, &authctxt->success, authctxt);

	return (authctxt);
}

static void
input_service_request(int type, u_int32_t seq, void *ctxt)
{
	Authctxt *authctxt = ctxt;
	u_int len;
	int accept = 0;
	char *service = packet_get_string(&len);
	packet_check_eom();

	if (authctxt == NULL)
		fatal("input_service_request: no authctxt");

	if (strcmp(service, "ssh-userauth") == 0) {
		if (!authctxt->success) {
			accept = 1;
			/* now we can handle user-auth requests */
			dispatch_set(SSH2_MSG_USERAUTH_REQUEST, &input_userauth_request);
		}
	}
	/* XXX all other service requests are denied */

	if (accept) {
		packet_start(SSH2_MSG_SERVICE_ACCEPT);
		packet_put_cstring(service);
		packet_send();
		packet_write_wait();
	} else {
		debug("bad service request %s", service);
		packet_disconnect("bad service request %s", service);
	}
	xfree(service);
}

static void
input_userauth_request(int type, u_int32_t seq, void *ctxt)
{
	Authctxt *authctxt = ctxt;
	Authmethod *m = NULL;
	char *user, *service, *method, *style = NULL;
	int authenticated = 0;

	if (authctxt == NULL)
		fatal("input_userauth_request: no authctxt");

	user = packet_get_string(NULL);
	service = packet_get_string(NULL);
	method = packet_get_string(NULL);

#ifdef GSSAPI
	if (strcmp(user, "") == 0) {
	    char *lname = NULL;
	    debug("gssapi received empty username");
	    PRIVSEP(ssh_gssapi_localname(&lname));
	    if (lname && lname[0] != '\0') {
		xfree(user);
		user = lname;
		debug("gssapi successfully set username to %s", user);
	    } else if (authctxt->valid) {
		debug("failed to set username from gssapi context");
		goto finish;
	    }
	}
#endif

	debug("userauth-request for user %s service %s method %s", user, service, method);
	debug("attempt %d failures %d", authctxt->attempt, authctxt->failures);

	if ((style = strchr(user, ':')) != NULL)
		*style++ = 0;

	if (!authctxt->user ||
	    strcmp(user, authctxt->user) != 0) {
		/* setup auth context */
		if (authctxt->user) {
		    xfree(authctxt->user);
		    authctxt->user = NULL;
		}
		if (authctxt->service) {
		    xfree(authctxt->service);
		    authctxt->service = NULL;
		}
		if (authctxt->style) {
		    xfree(authctxt->style);
		    authctxt->style = NULL;
		}
		authctxt->pw = PRIVSEP(getpwnamallow(user));
		if (authctxt->pw && strcmp(service, "ssh-connection")==0) {
			authctxt->valid = 1;
			debug2("input_userauth_request: setting up authctxt for %s", user);
#ifdef USE_PAM
			PRIVSEP(start_pam(authctxt->pw->pw_name));
#endif
		} else {
			authctxt->valid = 0;
			log("input_userauth_request: illegal user %s", user);
#ifdef USE_PAM
			PRIVSEP(start_pam("NOUSER"));
#endif
		}
		setproctitle("%s%s", authctxt->pw ? user : "unknown",
		    use_privsep ? " [net]" : "");
		authctxt->user = xstrdup(user);
		authctxt->service = xstrdup(service);
		authctxt->style = style ? xstrdup(style) : NULL;
		if (use_privsep)
			mm_inform_authserv(service, style);
	}
	/* reset state */
	auth2_challenge_stop(authctxt);

#ifdef GSSAPI
	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, NULL);
	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE, NULL);
#endif

	authctxt->postponed = 0;

	/* try to authenticate user */
	m = authmethod_lookup(method);
	if (m != NULL) {
		debug2("input_userauth_request: try method %s", method);
		authenticated =	m->userauth(authctxt);
	}
finish:
	userauth_finish(authctxt, authenticated, method);

	xfree(service);
	xfree(user);
	xfree(method);
}

void
userauth_finish(Authctxt *authctxt, int authenticated, char *method)
{
	char *methods;

	if (!authctxt->valid && authenticated)
		fatal("INTERNAL ERROR: authenticated invalid user %s",
		    authctxt->user);

	/* Special handling for root */
	if (authenticated && authctxt->pw->pw_uid == 0 &&
	    !auth_root_allowed(method))
		authenticated = 0;

#ifdef USE_PAM
	if (!use_privsep && authenticated && authctxt->user && 
	    !do_pam_account(authctxt->user, NULL))
		authenticated = 0;
#endif /* USE_PAM */

	/* Log before sending the reply */
	if (!compat20)
	auth_log(authctxt, authenticated, method, " ssh1");
	else
	auth_log(authctxt, authenticated, method, " ssh2");

	if (authctxt->postponed)
		return;

	/* XXX todo: check if multiple auth methods are needed */
	if (authenticated == 1) {
		/* turn off userauth */
		dispatch_set(SSH2_MSG_USERAUTH_REQUEST, &dispatch_protocol_ignore);
		if (compat20) {
		packet_start(SSH2_MSG_USERAUTH_SUCCESS);
		packet_send();
		packet_write_wait();
		}
		/* now we can break out */
		authctxt->success = 1;
	} else {
		if (authctxt->failures++ > AUTH_FAIL_MAX) {
#ifdef WITH_AIXAUTHENTICATE
			/* XXX: privsep */
			loginfailed(authctxt->user,
			    get_canonical_hostname(options.verify_reverse_mapping),
			    "ssh");
#endif /* WITH_AIXAUTHENTICATE */
			packet_disconnect(AUTH_FAIL_MSG, authctxt->user);
		}
		if (!compat20) {
		/*
		 * Break out of the dispatch loop now and go back to
	         * SSH1 code.  We need to set the 'success' flag to
	         * break out of the loop.  Set the 'postponed' flag to
	         * tell the SSH1 code that authentication failed.  The
	         * SSH1 code will handle sending SSH_SMSG_FAILURE.
		*/
		authctxt->success = authctxt->postponed = 1;
		} else {
		methods = authmethods_get();
		packet_start(SSH2_MSG_USERAUTH_FAILURE);
		packet_put_cstring(methods);
		packet_put_char(0);	/* XXX partial success, unused */
		packet_send();
		packet_write_wait();
		xfree(methods);
		}
	}
}

/* get current user */

struct passwd*
auth_get_user(void)
{
	return (x_authctxt != NULL && x_authctxt->valid) ? x_authctxt->pw : NULL;
}

#define	DELIM	","

static char *
authmethods_get(void)
{
	Buffer b;
	char *list;
	int i;

	buffer_init(&b);
	for (i = 0; authmethods[i] != NULL; i++) {
		if (strcmp(authmethods[i]->name, "none") == 0)
			continue;
		if (authmethods[i]->enabled != NULL &&
		    *(authmethods[i]->enabled) != 0) {
			if (buffer_len(&b) > 0)
				buffer_append(&b, ",", 1);
			buffer_append(&b, authmethods[i]->name,
			    strlen(authmethods[i]->name));
		}
	}
	buffer_append(&b, "\0", 1);
	list = xstrdup(buffer_ptr(&b));
	buffer_free(&b);
	return list;
}

static Authmethod *
authmethod_lookup(const char *name)
{
	int i;

	if (name != NULL)
		for (i = 0; authmethods[i] != NULL; i++)
			if (authmethods[i]->enabled != NULL &&
			    *(authmethods[i]->enabled) != 0 &&
			    strcmp(name, authmethods[i]->name) == 0)
				return authmethods[i];
	debug2("Unrecognized authentication method name: %s",
	    name ? name : "NULL");
	return NULL;
}
Commit	Line	Data
3c0ef626	1	/*
	2	* Copyright (c) 2000 Markus Friedl. All rights reserved.
	3	*
	4	* Redistribution and use in source and binary forms, with or without
	5	* modification, are permitted provided that the following conditions
	6	* are met:
	7	* 1. Redistributions of source code must retain the above copyright
	8	* notice, this list of conditions and the following disclaimer.
	9	* 2. Redistributions in binary form must reproduce the above copyright
	10	* notice, this list of conditions and the following disclaimer in the
	11	* documentation and/or other materials provided with the distribution.
	12	*
	13	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	14	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	15	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	16	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	17	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	18	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	19	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	20	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	21	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	22	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	23	*/
	24
	25	#include "includes.h"
44a053a3	26	RCSID("$OpenBSD: auth2.c,v 1.93 2002/05/31 11:35:15 markus Exp $");
3c0ef626	27
3c0ef626	28	#include "ssh2.h"
a2d82e42	29	#include "ssh1.h"
3c0ef626	30	#include "xmalloc.h"
3c0ef626	31	#include "packet.h"
3c0ef626	32	#include "log.h"
	33	#include "servconf.h"
	34	#include "compat.h"
3c0ef626	35	#include "auth.h"
3c0ef626	36	#include "dispatch.h"
3c0ef626	37	#include "pathnames.h"
510132b6	38	#include "monitor_wrap.h"
3c0ef626	39
5598e598	40	#ifdef GSSAPI
	41	#include "ssh-gss.h"
	42	#endif
	43
3c0ef626	44	/* import */
	45	extern ServerOptions options;
	46	extern u_char *session_id2;
	47	extern int session_id2_len;
	48
510132b6	49	Authctxt *x_authctxt = NULL;
3c0ef626	50
44a053a3	51	/* methods */
	52
	53	extern Authmethod method_none;
	54	#ifdef GSSAPI
	55	extern Authmethod method_external;
	56	extern Authmethod method_gssapi;
	57	#endif
	58	extern Authmethod method_pubkey;
	59	extern Authmethod method_passwd;
	60	extern Authmethod method_kbdint;
	61	extern Authmethod method_hostbased;
	62
	63	Authmethod *authmethods[] = {
	64	&method_none,
	65	#ifdef GSSAPI
	66	&method_external,
	67	&method_gssapi,
	68	#endif
	69	&method_pubkey,
	70	&method_passwd,
	71	&method_kbdint,
	72	&method_hostbased,
	73	NULL
3c0ef626	74	};
	75
	76	/* protocol */
	77
1e608e42	78	static void input_service_request(int, u_int32_t, void *);
1e608e42	79	static void input_userauth_request(int, u_int32_t, void *);
3c0ef626	80
	81	/* helper */
	82	static Authmethod authmethod_lookup(const char );
	83	static char *authmethods_get(void);
510132b6	84	int user_key_allowed(struct passwd , Key );
510132b6	85	int hostbased_key_allowed(struct passwd , const char , char , Key );
3c0ef626	86
3c0ef626	87	/*
	88	* loop until authctxt->success == TRUE
	89	*/
	90
510132b6	91	Authctxt *
1e608e42	92	do_authentication2(void)
3c0ef626	93	{
	94	Authctxt *authctxt = authctxt_new();
	95
	96	x_authctxt = authctxt; /XXX/
	97
	98	/* challenge-response is implemented via keyboard interactive */
	99	if (options.challenge_response_authentication)
	100	options.kbd_interactive_authentication = 1;
	101	if (options.pam_authentication_via_kbd_int)
	102	options.kbd_interactive_authentication = 1;
510132b6	103	if (use_privsep)
510132b6	104	options.pam_authentication_via_kbd_int = 0;
3c0ef626	105
1e608e42	106	dispatch_init(&dispatch_protocol_error);
3c0ef626	107	dispatch_set(SSH2_MSG_SERVICE_REQUEST, &input_service_request);
3c0ef626	108	dispatch_run(DISPATCH_BLOCK, &authctxt->success, authctxt);
510132b6	109
510132b6	110	return (authctxt);
3c0ef626	111	}
	112
	113	static void
1e608e42	114	input_service_request(int type, u_int32_t seq, void *ctxt)
3c0ef626	115	{
	116	Authctxt *authctxt = ctxt;
	117	u_int len;
	118	int accept = 0;
	119	char *service = packet_get_string(&len);
1e608e42	120	packet_check_eom();
3c0ef626	121
	122	if (authctxt == NULL)
	123	fatal("input_service_request: no authctxt");
	124
	125	if (strcmp(service, "ssh-userauth") == 0) {
	126	if (!authctxt->success) {
	127	accept = 1;
	128	/* now we can handle user-auth requests */
	129	dispatch_set(SSH2_MSG_USERAUTH_REQUEST, &input_userauth_request);
	130	}
	131	}
	132	/* XXX all other service requests are denied */
	133
	134	if (accept) {
	135	packet_start(SSH2_MSG_SERVICE_ACCEPT);
	136	packet_put_cstring(service);
	137	packet_send();
	138	packet_write_wait();
	139	} else {
	140	debug("bad service request %s", service);
	141	packet_disconnect("bad service request %s", service);
	142	}
	143	xfree(service);
	144	}
	145
	146	static void
1e608e42	147	input_userauth_request(int type, u_int32_t seq, void *ctxt)
3c0ef626	148	{
	149	Authctxt *authctxt = ctxt;
	150	Authmethod *m = NULL;
	151	char user, service, method, style = NULL;
	152	int authenticated = 0;
	153
	154	if (authctxt == NULL)
	155	fatal("input_userauth_request: no authctxt");
	156
	157	user = packet_get_string(NULL);
	158	service = packet_get_string(NULL);
	159	method = packet_get_string(NULL);
73a68d83	160
305d07c0	161	#ifdef GSSAPI
b59afbfe	162	if (strcmp(user, "") == 0) {
	163	char *lname = NULL;
	164	debug("gssapi received empty username");
	165	PRIVSEP(ssh_gssapi_localname(&lname));
	166	if (lname && lname[0] != '\0') {
	167	xfree(user);
	168	user = lname;
	169	debug("gssapi successfully set username to %s", user);
	170	} else if (authctxt->valid) {
	171	debug("failed to set username from gssapi context");
	172	goto finish;
	173	}
	174	}
	175	#endif
73a68d83	176
3c0ef626	177	debug("userauth-request for user %s service %s method %s", user, service, method);
	178	debug("attempt %d failures %d", authctxt->attempt, authctxt->failures);
	179
	180	if ((style = strchr(user, ':')) != NULL)
	181	*style++ = 0;
	182
b59afbfe	183	if (!authctxt->user \|\|
b59afbfe	184	strcmp(user, authctxt->user) != 0) {
3c0ef626	185	/* setup auth context */
b59afbfe	186	if (authctxt->user) {
	187	xfree(authctxt->user);
	188	authctxt->user = NULL;
	189	}
	190	if (authctxt->service) {
	191	xfree(authctxt->service);
	192	authctxt->service = NULL;
	193	}
	194	if (authctxt->style) {
	195	xfree(authctxt->style);
	196	authctxt->style = NULL;
	197	}
510132b6	198	authctxt->pw = PRIVSEP(getpwnamallow(user));
510132b6	199	if (authctxt->pw && strcmp(service, "ssh-connection")==0) {
3c0ef626	200	authctxt->valid = 1;
	201	debug2("input_userauth_request: setting up authctxt for %s", user);
	202	#ifdef USE_PAM
510132b6	203	PRIVSEP(start_pam(authctxt->pw->pw_name));
3c0ef626	204	#endif
3c0ef626	205	} else {
e964b42b	206	authctxt->valid = 0;
3c0ef626	207	log("input_userauth_request: illegal user %s", user);
3c0ef626	208	#ifdef USE_PAM
510132b6	209	PRIVSEP(start_pam("NOUSER"));
3c0ef626	210	#endif
3c0ef626	211	}
510132b6	212	setproctitle("%s%s", authctxt->pw ? user : "unknown",
510132b6	213	use_privsep ? " [net]" : "");
3c0ef626	214	authctxt->user = xstrdup(user);
	215	authctxt->service = xstrdup(service);
	216	authctxt->style = style ? xstrdup(style) : NULL;
510132b6	217	if (use_privsep)
510132b6	218	mm_inform_authserv(service, style);
3c0ef626	219	}
3c0ef626	220	/* reset state */
1e608e42	221	auth2_challenge_stop(authctxt);
5598e598	222
5598e598	223	#ifdef GSSAPI
1e608e42	224	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, NULL);
1e608e42	225	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE, NULL);
5598e598	226	#endif
5598e598	227
3c0ef626	228	authctxt->postponed = 0;
3c0ef626	229
	230	/* try to authenticate user */
	231	m = authmethod_lookup(method);
	232	if (m != NULL) {
	233	debug2("input_userauth_request: try method %s", method);
	234	authenticated = m->userauth(authctxt);
	235	}
b59afbfe	236	finish:
3c0ef626	237	userauth_finish(authctxt, authenticated, method);
	238
	239	xfree(service);
	240	xfree(user);
	241	xfree(method);
	242	}
	243
	244	void
	245	userauth_finish(Authctxt authctxt, int authenticated, char method)
	246	{
	247	char *methods;
	248
	249	if (!authctxt->valid && authenticated)
	250	fatal("INTERNAL ERROR: authenticated invalid user %s",
	251	authctxt->user);
	252
	253	/* Special handling for root */
	254	if (authenticated && authctxt->pw->pw_uid == 0 &&
	255	!auth_root_allowed(method))
	256	authenticated = 0;
	257
	258	#ifdef USE_PAM
510132b6	259	if (!use_privsep && authenticated && authctxt->user &&
510132b6	260	!do_pam_account(authctxt->user, NULL))
3c0ef626	261	authenticated = 0;
	262	#endif /* USE_PAM */
	263
	264	/* Log before sending the reply */
a2d82e42	265	if (!compat20)
	266	auth_log(authctxt, authenticated, method, " ssh1");
	267	else
3c0ef626	268	auth_log(authctxt, authenticated, method, " ssh2");
	269
	270	if (authctxt->postponed)
	271	return;
	272
	273	/* XXX todo: check if multiple auth methods are needed */
	274	if (authenticated == 1) {
	275	/* turn off userauth */
1e608e42	276	dispatch_set(SSH2_MSG_USERAUTH_REQUEST, &dispatch_protocol_ignore);
b59afbfe	277	if (compat20) {
3c0ef626	278	packet_start(SSH2_MSG_USERAUTH_SUCCESS);
	279	packet_send();
	280	packet_write_wait();
b59afbfe	281	}
3c0ef626	282	/* now we can break out */
	283	authctxt->success = 1;
	284	} else {
	285	if (authctxt->failures++ > AUTH_FAIL_MAX) {
	286	#ifdef WITH_AIXAUTHENTICATE
44a053a3	287	/* XXX: privsep */
3c0ef626	288	loginfailed(authctxt->user,
1e608e42	289	get_canonical_hostname(options.verify_reverse_mapping),
3c0ef626	290	"ssh");
	291	#endif /* WITH_AIXAUTHENTICATE */
	292	packet_disconnect(AUTH_FAIL_MSG, authctxt->user);
	293	}
411da244	294	if (!compat20) {
	295	/*
	296	* Break out of the dispatch loop now and go back to
	297	* SSH1 code. We need to set the 'success' flag to
	298	* break out of the loop. Set the 'postponed' flag to
	299	* tell the SSH1 code that authentication failed. The
	300	* SSH1 code will handle sending SSH_SMSG_FAILURE.
	301	*/
	302	authctxt->success = authctxt->postponed = 1;
	303	} else {
3c0ef626	304	methods = authmethods_get();
	305	packet_start(SSH2_MSG_USERAUTH_FAILURE);
	306	packet_put_cstring(methods);
	307	packet_put_char(0); /* XXX partial success, unused */
	308	packet_send();
	309	packet_write_wait();
	310	xfree(methods);
411da244	311	}
3c0ef626	312	}
	313	}
	314
3c0ef626	315	/* get current user */
	316
	317	struct passwd*
	318	auth_get_user(void)
	319	{
	320	return (x_authctxt != NULL && x_authctxt->valid) ? x_authctxt->pw : NULL;
	321	}
	322
	323	#define DELIM ","
	324
	325	static char *
	326	authmethods_get(void)
	327	{
1e608e42	328	Buffer b;
3c0ef626	329	char *list;
44a053a3	330	int i;
3c0ef626	331
1e608e42	332	buffer_init(&b);
44a053a3	333	for (i = 0; authmethods[i] != NULL; i++) {
44a053a3	334	if (strcmp(authmethods[i]->name, "none") == 0)
3c0ef626	335	continue;
44a053a3	336	if (authmethods[i]->enabled != NULL &&
44a053a3	337	*(authmethods[i]->enabled) != 0) {
1e608e42	338	if (buffer_len(&b) > 0)
1e608e42	339	buffer_append(&b, ",", 1);
44a053a3	340	buffer_append(&b, authmethods[i]->name,
44a053a3	341	strlen(authmethods[i]->name));
3c0ef626	342	}
3c0ef626	343	}
1e608e42	344	buffer_append(&b, "\0", 1);
	345	list = xstrdup(buffer_ptr(&b));
	346	buffer_free(&b);
3c0ef626	347	return list;
	348	}
	349
	350	static Authmethod *
	351	authmethod_lookup(const char *name)
	352	{
44a053a3	353	int i;
44a053a3	354
3c0ef626	355	if (name != NULL)
44a053a3	356	for (i = 0; authmethods[i] != NULL; i++)
	357	if (authmethods[i]->enabled != NULL &&
	358	*(authmethods[i]->enabled) != 0 &&
	359	strcmp(name, authmethods[i]->name) == 0)
	360	return authmethods[i];
	361	debug2("Unrecognized authentication method name: %s",
	362	name ? name : "NULL");
3c0ef626	363	return NULL;
3c0ef626	364	}