[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 1.104 2003/11/04 08:54:09 djm Exp $");

#include "ssh2.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 u_int session_id2_len;

/* methods */

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

Authmethod *authmethods[] = {
	&method_none,
	&method_pubkey,
#ifdef GSSAPI
	&method_external,
	&method_gssapi,
	&method_gssapi_compat,
#endif
	&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 *);

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

void
do_authentication2(Authctxt *authctxt)
{
	/* challenge-response is implemented via keyboard interactive */
	if (options.challenge_response_authentication)
		options.kbd_interactive_authentication = 1;

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

static void
input_service_request(int type, u_int32_t seq, void *ctxt)
{
	Authctxt *authctxt = ctxt;
	u_int len;
	int acceptit = 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) {
			acceptit = 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 (acceptit) {
		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) {
	    debug("received empty username for %s", method);
	    if (strcmp(method, "external-keyx") == 0) {
		char *lname = NULL;
		PRIVSEP(ssh_gssapi_localname(&lname));
		if (lname && lname[0] != '\0') {
		    xfree(user);
		    user = lname;
		    debug("set username to %s from gssapi context", user);
		} else if (authctxt->valid) {
		    debug("failed to set username from gssapi context");
		}
	    }
	}
#endif

	debug("userauth-request for user %s service %s method %s",
	      (user && user[0]) ? user : "<implicit>", service, method);
	debug("attempt %d failures %d", authctxt->attempt, authctxt->failures);

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

	;
	/* If first time or username changed or implicit username,
	   setup/reset authentication context. */
	if ((authctxt->attempt++ == 0) ||
	    (strcmp(user, authctxt->user) != 0) ||
	    (strcmp(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;
		}
#ifdef GSSAPI
		/* We'll verify the username after we set it from the
		   GSSAPI context. */
		if ((strcmp(user, "") == 0) &&
		    ((strcmp(method, "gssapi") == 0) ||
		     (strcmp(method, "external-keyx") == 0))) {
		    authctxt->pw = NULL;
		    authctxt->valid = 1;
		} else {
#endif
		authctxt->pw = PRIVSEP(getpwnamallow(user));
		authctxt->user = xstrdup(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
			if (options.use_pam)
				PRIVSEP(start_pam(authctxt));
#endif
		} else {
			logit("input_userauth_request: illegal user %s", user);
			authctxt->pw = fakepw();
#ifdef USE_PAM
			if (options.use_pam)
				PRIVSEP(start_pam(authctxt));
#endif
		}
#ifdef GSSAPI
		}
#endif
		setproctitle("%s%s", authctxt->pw ? user : "unknown",
		    use_privsep ? " [net]" : "");
		authctxt->service = xstrdup(service);
		authctxt->style = style ? xstrdup(style) : NULL;
		if (use_privsep && (authctxt->attempt == 1))
			mm_inform_authserv(service, style);
	} else if (strcmp(service, authctxt->service) != 0) {
		packet_disconnect("Change of service not allowed: "
		    "(%s,%s) -> (%s,%s)",
		    authctxt->user, authctxt->service, user, service);
	}
	/* 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);
	}
	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 (options.use_pam && authenticated && !PRIVSEP(do_pam_account()))
		authenticated = 0;
#endif

#ifdef _UNICOS
	if (authenticated && cray_access_denied(authctxt->user)) {
		authenticated = 0;
		fatal("Access denied for user %s.",authctxt->user);
	}
#endif /* _UNICOS */

	/* Log before sending the reply */
	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);
		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)
			packet_disconnect(AUTH_FAIL_MSG, authctxt->user);
		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);
	}
}

#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"
416fd2a8	26	RCSID("$OpenBSD: auth2.c,v 1.104 2003/11/04 08:54:09 djm Exp $");
3c0ef626	27
	28	#include "ssh2.h"
	29	#include "xmalloc.h"
3c0ef626	30	#include "packet.h"
3c0ef626	31	#include "log.h"
3c0ef626	32	#include "servconf.h"
416fd2a8	33	#include "compat.h"
3c0ef626	34	#include "auth.h"
3c0ef626	35	#include "dispatch.h"
3c0ef626	36	#include "pathnames.h"
2980ea68	37	#include "monitor_wrap.h"
3c0ef626	38
5598e598	39	#ifdef GSSAPI
	40	#include "ssh-gss.h"
	41	#endif
	42
3c0ef626	43	/* import */
	44	extern ServerOptions options;
	45	extern u_char *session_id2;
70791e56	46	extern u_int session_id2_len;
3c0ef626	47
ff2d7a98	48	/* methods */
	49
	50	extern Authmethod method_none;
ff2d7a98	51	extern Authmethod method_pubkey;
	52	extern Authmethod method_passwd;
	53	extern Authmethod method_kbdint;
	54	extern Authmethod method_hostbased;
88928908	55	#ifdef GSSAPI
	56	extern Authmethod method_external;
	57	extern Authmethod method_gssapi;
416fd2a8	58	extern Authmethod method_gssapi_compat;
88928908	59	#endif
ff2d7a98	60
	61	Authmethod *authmethods[] = {
	62	&method_none,
ff2d7a98	63	&method_pubkey,
70791e56	64	#ifdef GSSAPI
416fd2a8	65	&method_external,
70791e56	66	&method_gssapi,
416fd2a8	67	&method_gssapi_compat,
70791e56	68	#endif
ff2d7a98	69	&method_passwd,
	70	&method_kbdint,
	71	&method_hostbased,
	72	NULL
3c0ef626	73	};
	74
	75	/* protocol */
	76
1e608e42	77	static void input_service_request(int, u_int32_t, void *);
1e608e42	78	static void input_userauth_request(int, u_int32_t, void *);
3c0ef626	79
	80	/* helper */
	81	static Authmethod authmethod_lookup(const char );
	82	static char *authmethods_get(void);
2980ea68	83	int user_key_allowed(struct passwd , Key );
3c0ef626	84
3c0ef626	85	/*
	86	* loop until authctxt->success == TRUE
	87	*/
	88
416fd2a8	89	void
416fd2a8	90	do_authentication2(Authctxt *authctxt)
3c0ef626	91	{
3c0ef626	92	/* challenge-response is implemented via keyboard interactive */
	93	if (options.challenge_response_authentication)
	94	options.kbd_interactive_authentication = 1;
3c0ef626	95
1e608e42	96	dispatch_init(&dispatch_protocol_error);
3c0ef626	97	dispatch_set(SSH2_MSG_SERVICE_REQUEST, &input_service_request);
3c0ef626	98	dispatch_run(DISPATCH_BLOCK, &authctxt->success, authctxt);
3c0ef626	99	}
	100
	101	static void
1e608e42	102	input_service_request(int type, u_int32_t seq, void *ctxt)
3c0ef626	103	{
	104	Authctxt *authctxt = ctxt;
	105	u_int len;
e54b3d7c	106	int acceptit = 0;
3c0ef626	107	char *service = packet_get_string(&len);
1e608e42	108	packet_check_eom();
3c0ef626	109
	110	if (authctxt == NULL)
	111	fatal("input_service_request: no authctxt");
	112
	113	if (strcmp(service, "ssh-userauth") == 0) {
	114	if (!authctxt->success) {
e54b3d7c	115	acceptit = 1;
3c0ef626	116	/* now we can handle user-auth requests */
	117	dispatch_set(SSH2_MSG_USERAUTH_REQUEST, &input_userauth_request);
	118	}
	119	}
	120	/* XXX all other service requests are denied */
	121
e54b3d7c	122	if (acceptit) {
3c0ef626	123	packet_start(SSH2_MSG_SERVICE_ACCEPT);
	124	packet_put_cstring(service);
	125	packet_send();
	126	packet_write_wait();
	127	} else {
	128	debug("bad service request %s", service);
	129	packet_disconnect("bad service request %s", service);
	130	}
	131	xfree(service);
	132	}
	133
	134	static void
1e608e42	135	input_userauth_request(int type, u_int32_t seq, void *ctxt)
3c0ef626	136	{
	137	Authctxt *authctxt = ctxt;
	138	Authmethod *m = NULL;
	139	char user, service, method, style = NULL;
	140	int authenticated = 0;
	141
	142	if (authctxt == NULL)
	143	fatal("input_userauth_request: no authctxt");
	144
	145	user = packet_get_string(NULL);
	146	service = packet_get_string(NULL);
	147	method = packet_get_string(NULL);
2980ea68	148
2980ea68	149	#ifdef GSSAPI
ff2d7a98	150	if (strcmp(user, "") == 0) {
c2397a66	151	debug("received empty username for %s", method);
	152	if (strcmp(method, "external-keyx") == 0) {
	153	char *lname = NULL;
	154	PRIVSEP(ssh_gssapi_localname(&lname));
	155	if (lname && lname[0] != '\0') {
	156	xfree(user);
	157	user = lname;
	158	debug("set username to %s from gssapi context", user);
	159	} else if (authctxt->valid) {
	160	debug("failed to set username from gssapi context");
	161	}
ff2d7a98	162	}
	163	}
	164	#endif
2980ea68	165
c2397a66	166	debug("userauth-request for user %s service %s method %s",
c2397a66	167	(user && user[0]) ? user : "<implicit>", service, method);
3c0ef626	168	debug("attempt %d failures %d", authctxt->attempt, authctxt->failures);
	169
	170	if ((style = strchr(user, ':')) != NULL)
	171	*style++ = 0;
	172
416fd2a8	173	;
	174	/* If first time or username changed or implicit username,
	175	setup/reset authentication context. */
	176	if ((authctxt->attempt++ == 0) \|\|
	177	(strcmp(user, authctxt->user) != 0) \|\|
	178	(strcmp(user, "") == 0)) {
3c0ef626	179	/* setup auth context */
ff2d7a98	180	if (authctxt->user) {
	181	xfree(authctxt->user);
	182	authctxt->user = NULL;
	183	}
	184	if (authctxt->service) {
	185	xfree(authctxt->service);
	186	authctxt->service = NULL;
	187	}
	188	if (authctxt->style) {
	189	xfree(authctxt->style);
	190	authctxt->style = NULL;
	191	}
c2397a66	192	#ifdef GSSAPI
	193	/* We'll verify the username after we set it from the
	194	GSSAPI context. */
	195	if ((strcmp(user, "") == 0) &&
	196	((strcmp(method, "gssapi") == 0) \|\|
	197	(strcmp(method, "external-keyx") == 0))) {
	198	authctxt->pw = NULL;
	199	authctxt->valid = 1;
	200	} else {
	201	#endif
2980ea68	202	authctxt->pw = PRIVSEP(getpwnamallow(user));
2a304a95	203	authctxt->user = xstrdup(user);
2980ea68	204	if (authctxt->pw && strcmp(service, "ssh-connection")==0) {
3c0ef626	205	authctxt->valid = 1;
	206	debug2("input_userauth_request: setting up authctxt for %s", user);
	207	#ifdef USE_PAM
70791e56	208	if (options.use_pam)
2a304a95	209	PRIVSEP(start_pam(authctxt));
3c0ef626	210	#endif
3c0ef626	211	} else {
70791e56	212	logit("input_userauth_request: illegal user %s", user);
70791e56	213	authctxt->pw = fakepw();
3c0ef626	214	#ifdef USE_PAM
70791e56	215	if (options.use_pam)
2a304a95	216	PRIVSEP(start_pam(authctxt));
3c0ef626	217	#endif
3c0ef626	218	}
c2397a66	219	#ifdef GSSAPI
	220	}
	221	#endif
2980ea68	222	setproctitle("%s%s", authctxt->pw ? user : "unknown",
2980ea68	223	use_privsep ? " [net]" : "");
3c0ef626	224	authctxt->service = xstrdup(service);
3c0ef626	225	authctxt->style = style ? xstrdup(style) : NULL;
c2397a66	226	if (use_privsep && (authctxt->attempt == 1))
2980ea68	227	mm_inform_authserv(service, style);
88928908	228	} else if (strcmp(service, authctxt->service) != 0) {
	229	packet_disconnect("Change of service not allowed: "
	230	"(%s,%s) -> (%s,%s)",
	231	authctxt->user, authctxt->service, user, service);
3c0ef626	232	}
3c0ef626	233	/* reset state */
1e608e42	234	auth2_challenge_stop(authctxt);
5598e598	235
5598e598	236	#ifdef GSSAPI
1e608e42	237	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, NULL);
1e608e42	238	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE, NULL);
5598e598	239	#endif
5598e598	240
3c0ef626	241	authctxt->postponed = 0;
3c0ef626	242
	243	/* try to authenticate user */
	244	m = authmethod_lookup(method);
	245	if (m != NULL) {
	246	debug2("input_userauth_request: try method %s", method);
	247	authenticated = m->userauth(authctxt);
	248	}
	249	userauth_finish(authctxt, authenticated, method);
	250
	251	xfree(service);
	252	xfree(user);
	253	xfree(method);
	254	}
	255
	256	void
	257	userauth_finish(Authctxt authctxt, int authenticated, char method)
	258	{
	259	char *methods;
	260
	261	if (!authctxt->valid && authenticated)
	262	fatal("INTERNAL ERROR: authenticated invalid user %s",
	263	authctxt->user);
	264
	265	/* Special handling for root */
1c14df9e	266	if (authenticated && authctxt->pw->pw_uid == 0 &&
3c0ef626	267	!auth_root_allowed(method))
	268	authenticated = 0;
	269
	270	#ifdef USE_PAM
70791e56	271	if (options.use_pam && authenticated && !PRIVSEP(do_pam_account()))
3c0ef626	272	authenticated = 0;
70791e56	273	#endif
3c0ef626	274
e54b3d7c	275	#ifdef _UNICOS
	276	if (authenticated && cray_access_denied(authctxt->user)) {
	277	authenticated = 0;
	278	fatal("Access denied for user %s.",authctxt->user);
	279	}
	280	#endif /* _UNICOS */
	281
3c0ef626	282	/* Log before sending the reply */
	283	auth_log(authctxt, authenticated, method, " ssh2");
	284
	285	if (authctxt->postponed)
	286	return;
	287
	288	/* XXX todo: check if multiple auth methods are needed */
	289	if (authenticated == 1) {
	290	/* turn off userauth */
1e608e42	291	dispatch_set(SSH2_MSG_USERAUTH_REQUEST, &dispatch_protocol_ignore);
3c0ef626	292	packet_start(SSH2_MSG_USERAUTH_SUCCESS);
	293	packet_send();
	294	packet_write_wait();
	295	/* now we can break out */
	296	authctxt->success = 1;
	297	} else {
70791e56	298	if (authctxt->failures++ > AUTH_FAIL_MAX)
3c0ef626	299	packet_disconnect(AUTH_FAIL_MSG, authctxt->user);
3c0ef626	300	methods = authmethods_get();
	301	packet_start(SSH2_MSG_USERAUTH_FAILURE);
	302	packet_put_cstring(methods);
	303	packet_put_char(0); /* XXX partial success, unused */
	304	packet_send();
	305	packet_write_wait();
	306	xfree(methods);
	307	}
	308	}
	309
3c0ef626	310	#define DELIM ","
	311
	312	static char *
	313	authmethods_get(void)
	314	{
1e608e42	315	Buffer b;
3c0ef626	316	char *list;
ff2d7a98	317	int i;
3c0ef626	318
1e608e42	319	buffer_init(&b);
ff2d7a98	320	for (i = 0; authmethods[i] != NULL; i++) {
ff2d7a98	321	if (strcmp(authmethods[i]->name, "none") == 0)
3c0ef626	322	continue;
ff2d7a98	323	if (authmethods[i]->enabled != NULL &&
ff2d7a98	324	*(authmethods[i]->enabled) != 0) {
1e608e42	325	if (buffer_len(&b) > 0)
1e608e42	326	buffer_append(&b, ",", 1);
ff2d7a98	327	buffer_append(&b, authmethods[i]->name,
ff2d7a98	328	strlen(authmethods[i]->name));
3c0ef626	329	}
3c0ef626	330	}
1e608e42	331	buffer_append(&b, "\0", 1);
	332	list = xstrdup(buffer_ptr(&b));
	333	buffer_free(&b);
3c0ef626	334	return list;
	335	}
	336
	337	static Authmethod *
	338	authmethod_lookup(const char *name)
	339	{
ff2d7a98	340	int i;
ff2d7a98	341
3c0ef626	342	if (name != NULL)
ff2d7a98	343	for (i = 0; authmethods[i] != NULL; i++)
	344	if (authmethods[i]->enabled != NULL &&
	345	*(authmethods[i]->enabled) != 0 &&
	346	strcmp(name, authmethods[i]->name) == 0)
	347	return authmethods[i];
	348	debug2("Unrecognized authentication method name: %s",
	349	name ? name : "NULL");
3c0ef626	350	return NULL;
3c0ef626	351	}