[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 "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));
		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->pw->pw_name));
#endif
		} else {
			logit("input_userauth_request: illegal user %s", user);
			authctxt->pw = fakepw();
#ifdef USE_PAM
			if (options.use_pam)
				PRIVSEP(start_pam(user));
#endif
		}
#ifdef GSSAPI
		}
#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 && (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"
540d72c3	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"
3c0ef626	33	#include "auth.h"
3c0ef626	34	#include "dispatch.h"
3c0ef626	35	#include "pathnames.h"
510132b6	36	#include "monitor_wrap.h"
3c0ef626	37
5598e598	38	#ifdef GSSAPI
	39	#include "ssh-gss.h"
	40	#endif
	41
3c0ef626	42	/* import */
	43	extern ServerOptions options;
	44	extern u_char *session_id2;
7cac2b65	45	extern u_int session_id2_len;
3c0ef626	46
44a053a3	47	/* methods */
	48
	49	extern Authmethod method_none;
44a053a3	50	extern Authmethod method_pubkey;
	51	extern Authmethod method_passwd;
	52	extern Authmethod method_kbdint;
	53	extern Authmethod method_hostbased;
db870295	54	#ifdef GSSAPI
	55	extern Authmethod method_external;
	56	extern Authmethod method_gssapi;
540d72c3	57	extern Authmethod method_gssapi_compat;
db870295	58	#endif
44a053a3	59
	60	Authmethod *authmethods[] = {
	61	&method_none,
44a053a3	62	&method_pubkey,
7cac2b65	63	#ifdef GSSAPI
540d72c3	64	&method_external,
7cac2b65	65	&method_gssapi,
540d72c3	66	&method_gssapi_compat,
7cac2b65	67	#endif
44a053a3	68	&method_passwd,
	69	&method_kbdint,
	70	&method_hostbased,
	71	NULL
3c0ef626	72	};
	73
	74	/* protocol */
	75
1e608e42	76	static void input_service_request(int, u_int32_t, void *);
1e608e42	77	static void input_userauth_request(int, u_int32_t, void *);
3c0ef626	78
	79	/* helper */
	80	static Authmethod authmethod_lookup(const char );
	81	static char *authmethods_get(void);
510132b6	82	int user_key_allowed(struct passwd , Key );
3c0ef626	83
3c0ef626	84	/*
	85	* loop until authctxt->success == TRUE
	86	*/
	87
540d72c3	88	void
540d72c3	89	do_authentication2(Authctxt *authctxt)
3c0ef626	90	{
3c0ef626	91	/* challenge-response is implemented via keyboard interactive */
	92	if (options.challenge_response_authentication)
	93	options.kbd_interactive_authentication = 1;
3c0ef626	94
1e608e42	95	dispatch_init(&dispatch_protocol_error);
3c0ef626	96	dispatch_set(SSH2_MSG_SERVICE_REQUEST, &input_service_request);
3c0ef626	97	dispatch_run(DISPATCH_BLOCK, &authctxt->success, authctxt);
3c0ef626	98	}
	99
	100	static void
1e608e42	101	input_service_request(int type, u_int32_t seq, void *ctxt)
3c0ef626	102	{
	103	Authctxt *authctxt = ctxt;
	104	u_int len;
d03f4262	105	int acceptit = 0;
3c0ef626	106	char *service = packet_get_string(&len);
1e608e42	107	packet_check_eom();
3c0ef626	108
	109	if (authctxt == NULL)
	110	fatal("input_service_request: no authctxt");
	111
	112	if (strcmp(service, "ssh-userauth") == 0) {
	113	if (!authctxt->success) {
d03f4262	114	acceptit = 1;
3c0ef626	115	/* now we can handle user-auth requests */
	116	dispatch_set(SSH2_MSG_USERAUTH_REQUEST, &input_userauth_request);
	117	}
	118	}
	119	/* XXX all other service requests are denied */
	120
d03f4262	121	if (acceptit) {
3c0ef626	122	packet_start(SSH2_MSG_SERVICE_ACCEPT);
	123	packet_put_cstring(service);
	124	packet_send();
	125	packet_write_wait();
	126	} else {
	127	debug("bad service request %s", service);
	128	packet_disconnect("bad service request %s", service);
	129	}
	130	xfree(service);
	131	}
	132
	133	static void
1e608e42	134	input_userauth_request(int type, u_int32_t seq, void *ctxt)
3c0ef626	135	{
	136	Authctxt *authctxt = ctxt;
	137	Authmethod *m = NULL;
	138	char user, service, method, style = NULL;
	139	int authenticated = 0;
	140
	141	if (authctxt == NULL)
	142	fatal("input_userauth_request: no authctxt");
	143
	144	user = packet_get_string(NULL);
	145	service = packet_get_string(NULL);
	146	method = packet_get_string(NULL);
73a68d83	147
305d07c0	148	#ifdef GSSAPI
b59afbfe	149	if (strcmp(user, "") == 0) {
b8e8844a	150	debug("received empty username for %s", method);
	151	if (strcmp(method, "external-keyx") == 0) {
	152	char *lname = NULL;
	153	PRIVSEP(ssh_gssapi_localname(&lname));
	154	if (lname && lname[0] != '\0') {
	155	xfree(user);
	156	user = lname;
	157	debug("set username to %s from gssapi context", user);
	158	} else if (authctxt->valid) {
	159	debug("failed to set username from gssapi context");
	160	}
b59afbfe	161	}
	162	}
	163	#endif
73a68d83	164
b8e8844a	165	debug("userauth-request for user %s service %s method %s",
b8e8844a	166	(user && user[0]) ? user : "<implicit>", service, method);
3c0ef626	167	debug("attempt %d failures %d", authctxt->attempt, authctxt->failures);
	168
	169	if ((style = strchr(user, ':')) != NULL)
	170	*style++ = 0;
	171
781f72b9	172	;
	173	/* If first time or username changed or implicit username,
	174	setup/reset authentication context. */
	175	if ((authctxt->attempt++ == 0) \|\|
	176	(strcmp(user, authctxt->user) != 0) \|\|
	177	(strcmp(user, "") == 0)) {
3c0ef626	178	/* setup auth context */
b59afbfe	179	if (authctxt->user) {
	180	xfree(authctxt->user);
	181	authctxt->user = NULL;
	182	}
	183	if (authctxt->service) {
	184	xfree(authctxt->service);
	185	authctxt->service = NULL;
	186	}
	187	if (authctxt->style) {
	188	xfree(authctxt->style);
	189	authctxt->style = NULL;
	190	}
b8e8844a	191	#ifdef GSSAPI
	192	/* We'll verify the username after we set it from the
	193	GSSAPI context. */
	194	if ((strcmp(user, "") == 0) &&
	195	((strcmp(method, "gssapi") == 0) \|\|
	196	(strcmp(method, "external-keyx") == 0))) {
	197	authctxt->pw = NULL;
	198	authctxt->valid = 1;
	199	} else {
	200	#endif
510132b6	201	authctxt->pw = PRIVSEP(getpwnamallow(user));
510132b6	202	if (authctxt->pw && strcmp(service, "ssh-connection")==0) {
3c0ef626	203	authctxt->valid = 1;
	204	debug2("input_userauth_request: setting up authctxt for %s", user);
	205	#ifdef USE_PAM
7cac2b65	206	if (options.use_pam)
7cac2b65	207	PRIVSEP(start_pam(authctxt->pw->pw_name));
3c0ef626	208	#endif
3c0ef626	209	} else {
7cac2b65	210	logit("input_userauth_request: illegal user %s", user);
7cac2b65	211	authctxt->pw = fakepw();
3c0ef626	212	#ifdef USE_PAM
7cac2b65	213	if (options.use_pam)
7cac2b65	214	PRIVSEP(start_pam(user));
3c0ef626	215	#endif
3c0ef626	216	}
b8e8844a	217	#ifdef GSSAPI
	218	}
	219	#endif
510132b6	220	setproctitle("%s%s", authctxt->pw ? user : "unknown",
510132b6	221	use_privsep ? " [net]" : "");
3c0ef626	222	authctxt->user = xstrdup(user);
	223	authctxt->service = xstrdup(service);
	224	authctxt->style = style ? xstrdup(style) : NULL;
b8e8844a	225	if (use_privsep && (authctxt->attempt == 1))
510132b6	226	mm_inform_authserv(service, style);
67b84e65	227	} else if (strcmp(service, authctxt->service) != 0) {
	228	packet_disconnect("Change of service not allowed: "
	229	"(%s,%s) -> (%s,%s)",
	230	authctxt->user, authctxt->service, user, service);
3c0ef626	231	}
3c0ef626	232	/* reset state */
1e608e42	233	auth2_challenge_stop(authctxt);
5598e598	234
5598e598	235	#ifdef GSSAPI
1e608e42	236	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, NULL);
1e608e42	237	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE, NULL);
5598e598	238	#endif
5598e598	239
3c0ef626	240	authctxt->postponed = 0;
3c0ef626	241
	242	/* try to authenticate user */
	243	m = authmethod_lookup(method);
	244	if (m != NULL) {
	245	debug2("input_userauth_request: try method %s", method);
	246	authenticated = m->userauth(authctxt);
	247	}
	248	userauth_finish(authctxt, authenticated, method);
	249
	250	xfree(service);
	251	xfree(user);
	252	xfree(method);
	253	}
	254
	255	void
	256	userauth_finish(Authctxt authctxt, int authenticated, char method)
	257	{
	258	char *methods;
	259
	260	if (!authctxt->valid && authenticated)
	261	fatal("INTERNAL ERROR: authenticated invalid user %s",
	262	authctxt->user);
	263
	264	/* Special handling for root */
bfe49944	265	if (authenticated && authctxt->pw->pw_uid == 0 &&
3c0ef626	266	!auth_root_allowed(method))
	267	authenticated = 0;
	268
	269	#ifdef USE_PAM
7cac2b65	270	if (options.use_pam && authenticated && !PRIVSEP(do_pam_account()))
3c0ef626	271	authenticated = 0;
7cac2b65	272	#endif
3c0ef626	273
d03f4262	274	#ifdef _UNICOS
	275	if (authenticated && cray_access_denied(authctxt->user)) {
	276	authenticated = 0;
	277	fatal("Access denied for user %s.",authctxt->user);
	278	}
	279	#endif /* _UNICOS */
	280
3c0ef626	281	/* Log before sending the reply */
	282	auth_log(authctxt, authenticated, method, " ssh2");
	283
	284	if (authctxt->postponed)
	285	return;
	286
	287	/* XXX todo: check if multiple auth methods are needed */
	288	if (authenticated == 1) {
	289	/* turn off userauth */
1e608e42	290	dispatch_set(SSH2_MSG_USERAUTH_REQUEST, &dispatch_protocol_ignore);
3c0ef626	291	packet_start(SSH2_MSG_USERAUTH_SUCCESS);
	292	packet_send();
	293	packet_write_wait();
	294	/* now we can break out */
	295	authctxt->success = 1;
	296	} else {
7cac2b65	297	if (authctxt->failures++ > AUTH_FAIL_MAX)
3c0ef626	298	packet_disconnect(AUTH_FAIL_MSG, authctxt->user);
3c0ef626	299	methods = authmethods_get();
	300	packet_start(SSH2_MSG_USERAUTH_FAILURE);
	301	packet_put_cstring(methods);
	302	packet_put_char(0); /* XXX partial success, unused */
	303	packet_send();
	304	packet_write_wait();
	305	xfree(methods);
	306	}
	307	}
	308
3c0ef626	309	#define DELIM ","
	310
	311	static char *
	312	authmethods_get(void)
	313	{
1e608e42	314	Buffer b;
3c0ef626	315	char *list;
44a053a3	316	int i;
3c0ef626	317
1e608e42	318	buffer_init(&b);
44a053a3	319	for (i = 0; authmethods[i] != NULL; i++) {
44a053a3	320	if (strcmp(authmethods[i]->name, "none") == 0)
3c0ef626	321	continue;
44a053a3	322	if (authmethods[i]->enabled != NULL &&
44a053a3	323	*(authmethods[i]->enabled) != 0) {
1e608e42	324	if (buffer_len(&b) > 0)
1e608e42	325	buffer_append(&b, ",", 1);
44a053a3	326	buffer_append(&b, authmethods[i]->name,
44a053a3	327	strlen(authmethods[i]->name));
3c0ef626	328	}
3c0ef626	329	}
1e608e42	330	buffer_append(&b, "\0", 1);
	331	list = xstrdup(buffer_ptr(&b));
	332	buffer_free(&b);
3c0ef626	333	return list;
	334	}
	335
	336	static Authmethod *
	337	authmethod_lookup(const char *name)
	338	{
44a053a3	339	int i;
44a053a3	340
3c0ef626	341	if (name != NULL)
44a053a3	342	for (i = 0; authmethods[i] != NULL; i++)
	343	if (authmethods[i]->enabled != NULL &&
	344	*(authmethods[i]->enabled) != 0 &&
	345	strcmp(name, authmethods[i]->name) == 0)
	346	return authmethods[i];
	347	debug2("Unrecognized authentication method name: %s",
	348	name ? name : "NULL");
3c0ef626	349	return NULL;
3c0ef626	350	}