[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 1.96 2003/02/06 21:22:43 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 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;

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

#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 */
	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) {
			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 {
#ifdef _UNICOS
		if (strcmp(method, "password") == 0)
			cray_login_failure(authctxt->user, IA_UDBERR);
#endif /* _UNICOS */
		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"
bfe49944	26	RCSID("$OpenBSD: auth2.c,v 1.96 2003/02/06 21:22:43 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;
d03f4262	118	int acceptit = 0;
3c0ef626	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) {
d03f4262	127	acceptit = 1;
3c0ef626	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
d03f4262	134	if (acceptit) {
3c0ef626	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) {
b8e8844a	163	debug("received empty username for %s", method);
	164	if (strcmp(method, "external-keyx") == 0) {
	165	char *lname = NULL;
	166	PRIVSEP(ssh_gssapi_localname(&lname));
	167	if (lname && lname[0] != '\0') {
	168	xfree(user);
	169	user = lname;
	170	debug("set username to %s from gssapi context", user);
	171	} else if (authctxt->valid) {
	172	debug("failed to set username from gssapi context");
	173	}
b59afbfe	174	}
	175	}
	176	#endif
73a68d83	177
b8e8844a	178	debug("userauth-request for user %s service %s method %s",
b8e8844a	179	(user && user[0]) ? user : "<implicit>", service, method);
3c0ef626	180	debug("attempt %d failures %d", authctxt->attempt, authctxt->failures);
	181
	182	if ((style = strchr(user, ':')) != NULL)
	183	*style++ = 0;
	184
b8e8844a	185	authctxt->attempt++;
b59afbfe	186	if (!authctxt->user \|\|
b59afbfe	187	strcmp(user, authctxt->user) != 0) {
3c0ef626	188	/* setup auth context */
b59afbfe	189	if (authctxt->user) {
	190	xfree(authctxt->user);
	191	authctxt->user = NULL;
	192	}
	193	if (authctxt->service) {
	194	xfree(authctxt->service);
	195	authctxt->service = NULL;
	196	}
	197	if (authctxt->style) {
	198	xfree(authctxt->style);
	199	authctxt->style = NULL;
	200	}
b8e8844a	201	#ifdef GSSAPI
	202	/* We'll verify the username after we set it from the
	203	GSSAPI context. */
	204	if ((strcmp(user, "") == 0) &&
	205	((strcmp(method, "gssapi") == 0) \|\|
	206	(strcmp(method, "external-keyx") == 0))) {
	207	authctxt->pw = NULL;
	208	authctxt->valid = 1;
	209	} else {
	210	#endif
510132b6	211	authctxt->pw = PRIVSEP(getpwnamallow(user));
510132b6	212	if (authctxt->pw && strcmp(service, "ssh-connection")==0) {
3c0ef626	213	authctxt->valid = 1;
	214	debug2("input_userauth_request: setting up authctxt for %s", user);
	215	#ifdef USE_PAM
510132b6	216	PRIVSEP(start_pam(authctxt->pw->pw_name));
3c0ef626	217	#endif
3c0ef626	218	} else {
e964b42b	219	authctxt->valid = 0;
3c0ef626	220	log("input_userauth_request: illegal user %s", user);
3c0ef626	221	#ifdef USE_PAM
510132b6	222	PRIVSEP(start_pam("NOUSER"));
3c0ef626	223	#endif
3c0ef626	224	}
b8e8844a	225	#ifdef GSSAPI
	226	}
	227	#endif
510132b6	228	setproctitle("%s%s", authctxt->pw ? user : "unknown",
510132b6	229	use_privsep ? " [net]" : "");
3c0ef626	230	authctxt->user = xstrdup(user);
	231	authctxt->service = xstrdup(service);
	232	authctxt->style = style ? xstrdup(style) : NULL;
b8e8844a	233	if (use_privsep && (authctxt->attempt == 1))
510132b6	234	mm_inform_authserv(service, style);
3c0ef626	235	}
3c0ef626	236	/* reset state */
1e608e42	237	auth2_challenge_stop(authctxt);
5598e598	238
5598e598	239	#ifdef GSSAPI
1e608e42	240	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, NULL);
1e608e42	241	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE, NULL);
5598e598	242	#endif
5598e598	243
3c0ef626	244	authctxt->postponed = 0;
3c0ef626	245
	246	/* try to authenticate user */
	247	m = authmethod_lookup(method);
	248	if (m != NULL) {
	249	debug2("input_userauth_request: try method %s", method);
	250	authenticated = m->userauth(authctxt);
	251	}
b8e8844a	252
3c0ef626	253	userauth_finish(authctxt, authenticated, method);
	254
	255	xfree(service);
	256	xfree(user);
	257	xfree(method);
	258	}
	259
	260	void
	261	userauth_finish(Authctxt authctxt, int authenticated, char method)
	262	{
	263	char *methods;
	264
	265	if (!authctxt->valid && authenticated)
	266	fatal("INTERNAL ERROR: authenticated invalid user %s",
	267	authctxt->user);
	268
	269	/* Special handling for root */
bfe49944	270	if (authenticated && authctxt->pw->pw_uid == 0 &&
3c0ef626	271	!auth_root_allowed(method))
	272	authenticated = 0;
	273
	274	#ifdef USE_PAM
510132b6	275	if (!use_privsep && authenticated && authctxt->user &&
510132b6	276	!do_pam_account(authctxt->user, NULL))
3c0ef626	277	authenticated = 0;
	278	#endif /* USE_PAM */
	279
d03f4262	280	#ifdef _UNICOS
	281	if (authenticated && cray_access_denied(authctxt->user)) {
	282	authenticated = 0;
	283	fatal("Access denied for user %s.",authctxt->user);
	284	}
	285	#endif /* _UNICOS */
	286
3c0ef626	287	/* Log before sending the reply */
a2d82e42	288	if (!compat20)
	289	auth_log(authctxt, authenticated, method, " ssh1");
	290	else
3c0ef626	291	auth_log(authctxt, authenticated, method, " ssh2");
	292
	293	if (authctxt->postponed)
	294	return;
	295
	296	/* XXX todo: check if multiple auth methods are needed */
	297	if (authenticated == 1) {
	298	/* turn off userauth */
1e608e42	299	dispatch_set(SSH2_MSG_USERAUTH_REQUEST, &dispatch_protocol_ignore);
b59afbfe	300	if (compat20) {
3c0ef626	301	packet_start(SSH2_MSG_USERAUTH_SUCCESS);
	302	packet_send();
	303	packet_write_wait();
b59afbfe	304	}
3c0ef626	305	/* now we can break out */
	306	authctxt->success = 1;
	307	} else {
	308	if (authctxt->failures++ > AUTH_FAIL_MAX) {
3c0ef626	309	packet_disconnect(AUTH_FAIL_MSG, authctxt->user);
3c0ef626	310	}
411da244	311	if (!compat20) {
	312	/*
	313	* Break out of the dispatch loop now and go back to
	314	* SSH1 code. We need to set the 'success' flag to
	315	* break out of the loop. Set the 'postponed' flag to
	316	* tell the SSH1 code that authentication failed. The
	317	* SSH1 code will handle sending SSH_SMSG_FAILURE.
	318	*/
	319	authctxt->success = authctxt->postponed = 1;
	320	} else {
d03f4262	321	#ifdef _UNICOS
	322	if (strcmp(method, "password") == 0)
	323	cray_login_failure(authctxt->user, IA_UDBERR);
	324	#endif /* _UNICOS */
3c0ef626	325	methods = authmethods_get();
	326	packet_start(SSH2_MSG_USERAUTH_FAILURE);
	327	packet_put_cstring(methods);
	328	packet_put_char(0); /* XXX partial success, unused */
	329	packet_send();
	330	packet_write_wait();
	331	xfree(methods);
411da244	332	}
3c0ef626	333	}
	334	}
	335
3c0ef626	336	/* get current user */
	337
	338	struct passwd*
	339	auth_get_user(void)
	340	{
	341	return (x_authctxt != NULL && x_authctxt->valid) ? x_authctxt->pw : NULL;
	342	}
	343
	344	#define DELIM ","
	345
	346	static char *
	347	authmethods_get(void)
	348	{
1e608e42	349	Buffer b;
3c0ef626	350	char *list;
44a053a3	351	int i;
3c0ef626	352
1e608e42	353	buffer_init(&b);
44a053a3	354	for (i = 0; authmethods[i] != NULL; i++) {
44a053a3	355	if (strcmp(authmethods[i]->name, "none") == 0)
3c0ef626	356	continue;
44a053a3	357	if (authmethods[i]->enabled != NULL &&
44a053a3	358	*(authmethods[i]->enabled) != 0) {
1e608e42	359	if (buffer_len(&b) > 0)
1e608e42	360	buffer_append(&b, ",", 1);
44a053a3	361	buffer_append(&b, authmethods[i]->name,
44a053a3	362	strlen(authmethods[i]->name));
3c0ef626	363	}
3c0ef626	364	}
1e608e42	365	buffer_append(&b, "\0", 1);
	366	list = xstrdup(buffer_ptr(&b));
	367	buffer_free(&b);
3c0ef626	368	return list;
	369	}
	370
	371	static Authmethod *
	372	authmethod_lookup(const char *name)
	373	{
44a053a3	374	int i;
44a053a3	375
3c0ef626	376	if (name != NULL)
44a053a3	377	for (i = 0; authmethods[i] != NULL; i++)
	378	if (authmethods[i]->enabled != NULL &&
	379	*(authmethods[i]->enabled) != 0 &&
	380	strcmp(name, authmethods[i]->name) == 0)
	381	return authmethods[i];
	382	debug2("Unrecognized authentication method name: %s",
	383	name ? name : "NULL");
3c0ef626	384	return NULL;
3c0ef626	385	}