[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"
#include "misc.h"

#ifdef GSSAPI
#include "ssh-gss.h"
#ifdef GSI
#include "globus_gss_assist.h"
char* olduser;
int  changeuser = 0;
#endif
#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
#ifdef GSI
        if(changeuser == 0 && (strcmp(method,"external-keyx") == 0 || strcmp(method,"gssapi") ==0) && strcmp(user,"") == 0) {
                char *gridmapped_name = NULL;
                struct passwd *pw = NULL;
                if(globus_gss_assist_gridmap(gssapi_client_name.value,
                                     &gridmapped_name) == 0) {
                        user = gridmapped_name;
                        debug("I gridmapped and got %s", user);
                        pw = getpwnam(user);
                        if (pw && allowed_user(pw)) {
                                olduser = authctxt->user;
                                authctxt->user = xstrdup(user);
                                authctxt->pw = pwcopy(pw);
                                authctxt->valid = 1;
                                changeuser = 1;
                        }

                } else {
		    debug("I gridmapped and got null, reverting to %s",
			  authctxt->user);
		    xfree(user);
		    user = xstrdup(authctxt->user);
                }
        }
        else if(changeuser) {
                struct passwd *pw = NULL;
                pw = getpwnam(user);
                if (pw && allowed_user(pw)) {
		    	xfree(authctxt->user);
                        authctxt->user = olduser;
                        authctxt->pw = pwcopy(pw);
                        authctxt->valid = 1;
                        changeuser = 0;
                }
        }

#endif  /* GSI */
#endif /* GSSAPI */

	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->attempt++ == 0) {
		/* setup auth context */
		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 {
			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);
	} else if (strcmp(user, authctxt->user) != 0 ||
	    strcmp(service, authctxt->service) != 0) {
		packet_disconnect("Change of username or 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 (!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(SSH_SMSG_SUCCESS);
		else
		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"
cf4d5580	39	#include "misc.h"
3c0ef626	40
5598e598	41	#ifdef GSSAPI
5598e598	42	#include "ssh-gss.h"
7d1d5d37	43	#ifdef GSI
7d1d5d37	44	#include "globus_gss_assist.h"
305d07c0	45	char* olduser;
305d07c0	46	int changeuser = 0;
7d1d5d37	47	#endif
5598e598	48	#endif
5598e598	49
3c0ef626	50	/* import */
	51	extern ServerOptions options;
	52	extern u_char *session_id2;
	53	extern int session_id2_len;
	54
510132b6	55	Authctxt *x_authctxt = NULL;
3c0ef626	56
44a053a3	57	/* methods */
	58
	59	extern Authmethod method_none;
	60	#ifdef GSSAPI
	61	extern Authmethod method_external;
	62	extern Authmethod method_gssapi;
	63	#endif
	64	extern Authmethod method_pubkey;
	65	extern Authmethod method_passwd;
	66	extern Authmethod method_kbdint;
	67	extern Authmethod method_hostbased;
	68
	69	Authmethod *authmethods[] = {
	70	&method_none,
	71	#ifdef GSSAPI
	72	&method_external,
	73	&method_gssapi,
	74	#endif
	75	&method_pubkey,
	76	&method_passwd,
	77	&method_kbdint,
	78	&method_hostbased,
	79	NULL
3c0ef626	80	};
	81
	82	/* protocol */
	83
1e608e42	84	static void input_service_request(int, u_int32_t, void *);
1e608e42	85	static void input_userauth_request(int, u_int32_t, void *);
3c0ef626	86
	87	/* helper */
	88	static Authmethod authmethod_lookup(const char );
	89	static char *authmethods_get(void);
510132b6	90	int user_key_allowed(struct passwd , Key );
510132b6	91	int hostbased_key_allowed(struct passwd , const char , char , Key );
3c0ef626	92
3c0ef626	93	/*
	94	* loop until authctxt->success == TRUE
	95	*/
	96
510132b6	97	Authctxt *
1e608e42	98	do_authentication2(void)
3c0ef626	99	{
	100	Authctxt *authctxt = authctxt_new();
	101
	102	x_authctxt = authctxt; /XXX/
	103
	104	/* challenge-response is implemented via keyboard interactive */
	105	if (options.challenge_response_authentication)
	106	options.kbd_interactive_authentication = 1;
	107	if (options.pam_authentication_via_kbd_int)
	108	options.kbd_interactive_authentication = 1;
510132b6	109	if (use_privsep)
510132b6	110	options.pam_authentication_via_kbd_int = 0;
3c0ef626	111
1e608e42	112	dispatch_init(&dispatch_protocol_error);
3c0ef626	113	dispatch_set(SSH2_MSG_SERVICE_REQUEST, &input_service_request);
3c0ef626	114	dispatch_run(DISPATCH_BLOCK, &authctxt->success, authctxt);
510132b6	115
510132b6	116	return (authctxt);
3c0ef626	117	}
	118
	119	static void
1e608e42	120	input_service_request(int type, u_int32_t seq, void *ctxt)
3c0ef626	121	{
	122	Authctxt *authctxt = ctxt;
	123	u_int len;
	124	int accept = 0;
	125	char *service = packet_get_string(&len);
1e608e42	126	packet_check_eom();
3c0ef626	127
	128	if (authctxt == NULL)
	129	fatal("input_service_request: no authctxt");
	130
	131	if (strcmp(service, "ssh-userauth") == 0) {
	132	if (!authctxt->success) {
	133	accept = 1;
	134	/* now we can handle user-auth requests */
	135	dispatch_set(SSH2_MSG_USERAUTH_REQUEST, &input_userauth_request);
	136	}
	137	}
	138	/* XXX all other service requests are denied */
	139
	140	if (accept) {
	141	packet_start(SSH2_MSG_SERVICE_ACCEPT);
	142	packet_put_cstring(service);
	143	packet_send();
	144	packet_write_wait();
	145	} else {
	146	debug("bad service request %s", service);
	147	packet_disconnect("bad service request %s", service);
	148	}
	149	xfree(service);
	150	}
	151
	152	static void
1e608e42	153	input_userauth_request(int type, u_int32_t seq, void *ctxt)
3c0ef626	154	{
	155	Authctxt *authctxt = ctxt;
	156	Authmethod *m = NULL;
	157	char user, service, method, style = NULL;
	158	int authenticated = 0;
	159
	160	if (authctxt == NULL)
	161	fatal("input_userauth_request: no authctxt");
	162
	163	user = packet_get_string(NULL);
	164	service = packet_get_string(NULL);
	165	method = packet_get_string(NULL);
73a68d83	166
305d07c0	167	#ifdef GSSAPI
	168	#ifdef GSI
	169	if(changeuser == 0 && (strcmp(method,"external-keyx") == 0 \|\| strcmp(method,"gssapi") ==0) && strcmp(user,"") == 0) {
73a68d83	170	char *gridmapped_name = NULL;
73a68d83	171	struct passwd *pw = NULL;
73a68d83	172	if(globus_gss_assist_gridmap(gssapi_client_name.value,
	173	&gridmapped_name) == 0) {
	174	user = gridmapped_name;
	175	debug("I gridmapped and got %s", user);
	176	pw = getpwnam(user);
	177	if (pw && allowed_user(pw)) {
305d07c0	178	olduser = authctxt->user;
a28539f3	179	authctxt->user = xstrdup(user);
73a68d83	180	authctxt->pw = pwcopy(pw);
73a68d83	181	authctxt->valid = 1;
305d07c0	182	changeuser = 1;
73a68d83	183	}
305d07c0	184
73a68d83	185	} else {
0dadc8a9	186	debug("I gridmapped and got null, reverting to %s",
	187	authctxt->user);
	188	xfree(user);
	189	user = xstrdup(authctxt->user);
73a68d83	190	}
73a68d83	191	}
305d07c0	192	else if(changeuser) {
	193	struct passwd *pw = NULL;
	194	pw = getpwnam(user);
	195	if (pw && allowed_user(pw)) {
a28539f3	196	xfree(authctxt->user);
305d07c0	197	authctxt->user = olduser;
	198	authctxt->pw = pwcopy(pw);
	199	authctxt->valid = 1;
	200	changeuser = 0;
	201	}
	202	}
	203
	204	#endif /* GSI */
	205	#endif /* GSSAPI */
73a68d83	206
3c0ef626	207	debug("userauth-request for user %s service %s method %s", user, service, method);
	208	debug("attempt %d failures %d", authctxt->attempt, authctxt->failures);
	209
	210	if ((style = strchr(user, ':')) != NULL)
	211	*style++ = 0;
	212
	213	if (authctxt->attempt++ == 0) {
	214	/* setup auth context */
510132b6	215	authctxt->pw = PRIVSEP(getpwnamallow(user));
510132b6	216	if (authctxt->pw && strcmp(service, "ssh-connection")==0) {
3c0ef626	217	authctxt->valid = 1;
	218	debug2("input_userauth_request: setting up authctxt for %s", user);
	219	#ifdef USE_PAM
510132b6	220	PRIVSEP(start_pam(authctxt->pw->pw_name));
3c0ef626	221	#endif
	222	} else {
	223	log("input_userauth_request: illegal user %s", user);
	224	#ifdef USE_PAM
510132b6	225	PRIVSEP(start_pam("NOUSER"));
3c0ef626	226	#endif
3c0ef626	227	}
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;
510132b6	233	if (use_privsep)
510132b6	234	mm_inform_authserv(service, style);
3c0ef626	235	} else if (strcmp(user, authctxt->user) != 0 \|\|
	236	strcmp(service, authctxt->service) != 0) {
	237	packet_disconnect("Change of username or service not allowed: "
	238	"(%s,%s) -> (%s,%s)",
	239	authctxt->user, authctxt->service, user, service);
	240	}
	241	/* reset state */
1e608e42	242	auth2_challenge_stop(authctxt);
5598e598	243
5598e598	244	#ifdef GSSAPI
1e608e42	245	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, NULL);
1e608e42	246	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE, NULL);
5598e598	247	#endif
5598e598	248
3c0ef626	249	authctxt->postponed = 0;
3c0ef626	250
	251	/* try to authenticate user */
	252	m = authmethod_lookup(method);
	253	if (m != NULL) {
	254	debug2("input_userauth_request: try method %s", method);
	255	authenticated = m->userauth(authctxt);
	256	}
	257	userauth_finish(authctxt, authenticated, method);
	258
	259	xfree(service);
	260	xfree(user);
	261	xfree(method);
	262	}
	263
	264	void
	265	userauth_finish(Authctxt authctxt, int authenticated, char method)
	266	{
	267	char *methods;
	268
	269	if (!authctxt->valid && authenticated)
	270	fatal("INTERNAL ERROR: authenticated invalid user %s",
	271	authctxt->user);
	272
	273	/* Special handling for root */
	274	if (authenticated && authctxt->pw->pw_uid == 0 &&
	275	!auth_root_allowed(method))
	276	authenticated = 0;
	277
	278	#ifdef USE_PAM
510132b6	279	if (!use_privsep && authenticated && authctxt->user &&
510132b6	280	!do_pam_account(authctxt->user, NULL))
3c0ef626	281	authenticated = 0;
	282	#endif /* USE_PAM */
	283
	284	/* Log before sending the reply */
a2d82e42	285	if (!compat20)
	286	auth_log(authctxt, authenticated, method, " ssh1");
	287	else
3c0ef626	288	auth_log(authctxt, authenticated, method, " ssh2");
	289
	290	if (authctxt->postponed)
	291	return;
	292
	293	/* XXX todo: check if multiple auth methods are needed */
	294	if (authenticated == 1) {
	295	/* turn off userauth */
1e608e42	296	dispatch_set(SSH2_MSG_USERAUTH_REQUEST, &dispatch_protocol_ignore);
a2d82e42	297	if (!compat20)
	298	packet_start(SSH_SMSG_SUCCESS);
	299	else
3c0ef626	300	packet_start(SSH2_MSG_USERAUTH_SUCCESS);
	301	packet_send();
	302	packet_write_wait();
	303	/* now we can break out */
	304	authctxt->success = 1;
	305	} else {
	306	if (authctxt->failures++ > AUTH_FAIL_MAX) {
	307	#ifdef WITH_AIXAUTHENTICATE
44a053a3	308	/* XXX: privsep */
3c0ef626	309	loginfailed(authctxt->user,
1e608e42	310	get_canonical_hostname(options.verify_reverse_mapping),
3c0ef626	311	"ssh");
	312	#endif /* WITH_AIXAUTHENTICATE */
	313	packet_disconnect(AUTH_FAIL_MSG, authctxt->user);
	314	}
411da244	315	if (!compat20) {
	316	/*
	317	* Break out of the dispatch loop now and go back to
	318	* SSH1 code. We need to set the 'success' flag to
	319	* break out of the loop. Set the 'postponed' flag to
	320	* tell the SSH1 code that authentication failed. The
	321	* SSH1 code will handle sending SSH_SMSG_FAILURE.
	322	*/
	323	authctxt->success = authctxt->postponed = 1;
	324	} else {
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	}