[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 1.107 2004/07/28 09:40:29 markus 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"
#include "buffer.h"

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

/* import */
extern ServerOptions options;
extern u_char *session_id2;
extern u_int session_id2_len;
extern Buffer loginmsg;

/* 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 (user[0] == '\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 {
		    debug("failed to set username from gssapi context");
		}
	    }
	}
#endif

	debug("userauth-request for user %s service %s method %s",
	      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)) {
		if (authctxt->user) {
		    xfree(authctxt->user);
		    authctxt->user = NULL;
		}
		authctxt->valid = 0;
#ifdef GSSAPI
		/* If we're going to set the username based on the
		   GSSAPI context later, then wait until then to
		   verify it. Just put in placeholders for now. */
		if ((strcmp(user, "") == 0) &&
		    ((strcmp(method, "gssapi") == 0) ||
		     (strcmp(method, "gssapi-with-mic") == 0))) {
			authctxt->pw = fakepw();
			authctxt->user = xstrdup(user);
		} 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: invalid user %s", user);
			authctxt->pw = fakepw();
#ifdef USE_PAM
			if (options.use_pam)
				PRIVSEP(start_pam(authctxt));
#endif
#ifdef SSH_AUDIT_EVENTS
			PRIVSEP(audit_event(SSH_INVALID_USER));
#endif
		}
#ifdef GSSAPI
		} /* endif for setting username based on GSSAPI context */
#endif
		setproctitle("%s%s", authctxt->valid ? user : "unknown",
		    use_privsep ? " [net]" : "");
#ifdef GSSAPI
		if (authctxt->attempt == 1) {
#endif
		authctxt->service = xstrdup(service);
		authctxt->style = style ? xstrdup(style) : NULL;
		if (use_privsep)
			mm_inform_authserv(service, style);
#ifdef GSSAPI
		} /* if (authctxt->attempt == 1) */
#endif
	}
	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 SSH_AUDIT_EVENTS
		PRIVSEP(audit_event(SSH_LOGIN_ROOT_DENIED));
#endif
	}

#ifdef USE_PAM
	if (options.use_pam && authenticated) {
		if (!PRIVSEP(do_pam_account())) {
			/* if PAM returned a message, send it to the user */
			if (buffer_len(&loginmsg) > 0) {
				buffer_append(&loginmsg, "\0", 1);
				userauth_send_banner(buffer_ptr(&loginmsg));
				packet_write_wait();
			}
			fatal("Access denied for user %s by PAM account "
			    "configuration", authctxt->user);
		}
	}
#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++ > options.max_authtries) {
#ifdef SSH_AUDIT_EVENTS
			PRIVSEP(audit_event(SSH_LOGIN_EXCEED_MAXTRIES));
#endif
			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"
7e82606e	26	RCSID("$OpenBSD: auth2.c,v 1.107 2004/07/28 09:40:29 markus 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"
bddc9ab0	33	#include "compat.h"
3c0ef626	34	#include "auth.h"
3c0ef626	35	#include "dispatch.h"
3c0ef626	36	#include "pathnames.h"
510132b6	37	#include "monitor_wrap.h"
dfddba3d	38	#include "buffer.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;
7cac2b65	47	extern u_int session_id2_len;
dfddba3d	48	extern Buffer loginmsg;
3c0ef626	49
44a053a3	50	/* methods */
	51
	52	extern Authmethod method_none;
44a053a3	53	extern Authmethod method_pubkey;
	54	extern Authmethod method_passwd;
	55	extern Authmethod method_kbdint;
	56	extern Authmethod method_hostbased;
db870295	57	#ifdef GSSAPI
	58	extern Authmethod method_external;
	59	extern Authmethod method_gssapi;
540d72c3	60	extern Authmethod method_gssapi_compat;
db870295	61	#endif
44a053a3	62
	63	Authmethod *authmethods[] = {
	64	&method_none,
44a053a3	65	&method_pubkey,
7cac2b65	66	#ifdef GSSAPI
540d72c3	67	&method_external,
7cac2b65	68	&method_gssapi,
540d72c3	69	&method_gssapi_compat,
7cac2b65	70	#endif
44a053a3	71	&method_passwd,
	72	&method_kbdint,
	73	&method_hostbased,
	74	NULL
3c0ef626	75	};
	76
	77	/* protocol */
	78
1e608e42	79	static void input_service_request(int, u_int32_t, void *);
1e608e42	80	static void input_userauth_request(int, u_int32_t, void *);
3c0ef626	81
	82	/* helper */
	83	static Authmethod authmethod_lookup(const char );
	84	static char *authmethods_get(void);
510132b6	85	int user_key_allowed(struct passwd , Key );
3c0ef626	86
3c0ef626	87	/*
	88	* loop until authctxt->success == TRUE
	89	*/
	90
540d72c3	91	void
540d72c3	92	do_authentication2(Authctxt *authctxt)
3c0ef626	93	{
3c0ef626	94	/* challenge-response is implemented via keyboard interactive */
	95	if (options.challenge_response_authentication)
	96	options.kbd_interactive_authentication = 1;
3c0ef626	97
1e608e42	98	dispatch_init(&dispatch_protocol_error);
3c0ef626	99	dispatch_set(SSH2_MSG_SERVICE_REQUEST, &input_service_request);
3c0ef626	100	dispatch_run(DISPATCH_BLOCK, &authctxt->success, authctxt);
3c0ef626	101	}
	102
	103	static void
1e608e42	104	input_service_request(int type, u_int32_t seq, void *ctxt)
3c0ef626	105	{
	106	Authctxt *authctxt = ctxt;
	107	u_int len;
d03f4262	108	int acceptit = 0;
3c0ef626	109	char *service = packet_get_string(&len);
1e608e42	110	packet_check_eom();
3c0ef626	111
	112	if (authctxt == NULL)
	113	fatal("input_service_request: no authctxt");
	114
	115	if (strcmp(service, "ssh-userauth") == 0) {
	116	if (!authctxt->success) {
d03f4262	117	acceptit = 1;
3c0ef626	118	/* now we can handle user-auth requests */
	119	dispatch_set(SSH2_MSG_USERAUTH_REQUEST, &input_userauth_request);
	120	}
	121	}
	122	/* XXX all other service requests are denied */
	123
d03f4262	124	if (acceptit) {
3c0ef626	125	packet_start(SSH2_MSG_SERVICE_ACCEPT);
	126	packet_put_cstring(service);
	127	packet_send();
	128	packet_write_wait();
	129	} else {
	130	debug("bad service request %s", service);
	131	packet_disconnect("bad service request %s", service);
	132	}
	133	xfree(service);
	134	}
	135
	136	static void
1e608e42	137	input_userauth_request(int type, u_int32_t seq, void *ctxt)
3c0ef626	138	{
	139	Authctxt *authctxt = ctxt;
	140	Authmethod *m = NULL;
	141	char user, service, method, style = NULL;
	142	int authenticated = 0;
	143
	144	if (authctxt == NULL)
	145	fatal("input_userauth_request: no authctxt");
	146
	147	user = packet_get_string(NULL);
	148	service = packet_get_string(NULL);
	149	method = packet_get_string(NULL);
73a68d83	150
305d07c0	151	#ifdef GSSAPI
8f3eb4db	152	if (user[0] == '\0') {
b8e8844a	153	debug("received empty username for %s", method);
	154	if (strcmp(method, "external-keyx") == 0) {
	155	char *lname = NULL;
	156	PRIVSEP(ssh_gssapi_localname(&lname));
	157	if (lname && lname[0] != '\0') {
	158	xfree(user);
	159	user = lname;
	160	debug("set username to %s from gssapi context", user);
9ec9d5ad	161	} else {
b8e8844a	162	debug("failed to set username from gssapi context");
b8e8844a	163	}
b59afbfe	164	}
	165	}
	166	#endif
73a68d83	167
b8e8844a	168	debug("userauth-request for user %s service %s method %s",
8f3eb4db	169	user[0] ? user : "<implicit>", service, method);
3c0ef626	170	debug("attempt %d failures %d", authctxt->attempt, authctxt->failures);
	171
	172	if ((style = strchr(user, ':')) != NULL)
	173	*style++ = 0;
	174
781f72b9	175	/* If first time or username changed or implicit username,
	176	setup/reset authentication context. */
	177	if ((authctxt->attempt++ == 0) \|\|
	178	(strcmp(user, authctxt->user) != 0) \|\|
	179	(strcmp(user, "") == 0)) {
b59afbfe	180	if (authctxt->user) {
	181	xfree(authctxt->user);
	182	authctxt->user = NULL;
	183	}
b809a58e	184	authctxt->valid = 0;
b8e8844a	185	#ifdef GSSAPI
9ec9d5ad	186	/* If we're going to set the username based on the
9ec9d5ad	187	GSSAPI context later, then wait until then to
8f3eb4db	188	verify it. Just put in placeholders for now. */
	189	if ((strcmp(user, "") == 0) &&
	190	((strcmp(method, "gssapi") == 0) \|\|
	191	(strcmp(method, "gssapi-with-mic") == 0))) {
	192	authctxt->pw = fakepw();
	193	authctxt->user = xstrdup(user);
	194	} else {
b8e8844a	195	#endif
510132b6	196	authctxt->pw = PRIVSEP(getpwnamallow(user));
12a403af	197	authctxt->user = xstrdup(user);
510132b6	198	if (authctxt->pw && strcmp(service, "ssh-connection")==0) {
3c0ef626	199	authctxt->valid = 1;
	200	debug2("input_userauth_request: setting up authctxt for %s", user);
	201	#ifdef USE_PAM
7cac2b65	202	if (options.use_pam)
12a403af	203	PRIVSEP(start_pam(authctxt));
3c0ef626	204	#endif
3c0ef626	205	} else {
7e82606e	206	logit("input_userauth_request: invalid user %s", user);
7cac2b65	207	authctxt->pw = fakepw();
3c0ef626	208	#ifdef USE_PAM
7cac2b65	209	if (options.use_pam)
12a403af	210	PRIVSEP(start_pam(authctxt));
dfddba3d	211	#endif
	212	#ifdef SSH_AUDIT_EVENTS
	213	PRIVSEP(audit_event(SSH_INVALID_USER));
3c0ef626	214	#endif
3c0ef626	215	}
b8e8844a	216	#ifdef GSSAPI
9ec9d5ad	217	} /* endif for setting username based on GSSAPI context */
b8e8844a	218	#endif
7e82606e	219	setproctitle("%s%s", authctxt->valid ? user : "unknown",
510132b6	220	use_privsep ? " [net]" : "");
b809a58e	221	#ifdef GSSAPI
88ca8dfd	222	if (authctxt->attempt == 1) {
b809a58e	223	#endif
	224	authctxt->service = xstrdup(service);
	225	authctxt->style = style ? xstrdup(style) : NULL;
	226	if (use_privsep)
510132b6	227	mm_inform_authserv(service, style);
b809a58e	228	#ifdef GSSAPI
	229	} /* if (authctxt->attempt == 1) */
	230	#endif
885ffc2b	231	}
885ffc2b	232	if (strcmp(service, authctxt->service) != 0) {
67b84e65	233	packet_disconnect("Change of service not allowed: "
	234	"(%s,%s) -> (%s,%s)",
	235	authctxt->user, authctxt->service, user, service);
3c0ef626	236	}
3c0ef626	237	/* reset state */
1e608e42	238	auth2_challenge_stop(authctxt);
5598e598	239
5598e598	240	#ifdef GSSAPI
1e608e42	241	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, NULL);
1e608e42	242	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE, NULL);
5598e598	243	#endif
5598e598	244
3c0ef626	245	authctxt->postponed = 0;
3c0ef626	246
	247	/* try to authenticate user */
	248	m = authmethod_lookup(method);
	249	if (m != NULL) {
	250	debug2("input_userauth_request: try method %s", method);
	251	authenticated = m->userauth(authctxt);
	252	}
	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 &&
dfddba3d	271	!auth_root_allowed(method)) {
3c0ef626	272	authenticated = 0;
dfddba3d	273	#ifdef SSH_AUDIT_EVENTS
	274	PRIVSEP(audit_event(SSH_LOGIN_ROOT_DENIED));
	275	#endif
	276	}
3c0ef626	277
3c0ef626	278	#ifdef USE_PAM
dfddba3d	279	if (options.use_pam && authenticated) {
	280	if (!PRIVSEP(do_pam_account())) {
	281	/* if PAM returned a message, send it to the user */
	282	if (buffer_len(&loginmsg) > 0) {
	283	buffer_append(&loginmsg, "\0", 1);
	284	userauth_send_banner(buffer_ptr(&loginmsg));
	285	packet_write_wait();
	286	}
	287	fatal("Access denied for user %s by PAM account "
2ce0bfe4	288	"configuration", authctxt->user);
dfddba3d	289	}
dfddba3d	290	}
7cac2b65	291	#endif
3c0ef626	292
d03f4262	293	#ifdef _UNICOS
	294	if (authenticated && cray_access_denied(authctxt->user)) {
	295	authenticated = 0;
	296	fatal("Access denied for user %s.",authctxt->user);
	297	}
	298	#endif /* _UNICOS */
	299
3c0ef626	300	/* Log before sending the reply */
	301	auth_log(authctxt, authenticated, method, " ssh2");
	302
	303	if (authctxt->postponed)
	304	return;
	305
	306	/* XXX todo: check if multiple auth methods are needed */
	307	if (authenticated == 1) {
	308	/* turn off userauth */
1e608e42	309	dispatch_set(SSH2_MSG_USERAUTH_REQUEST, &dispatch_protocol_ignore);
3c0ef626	310	packet_start(SSH2_MSG_USERAUTH_SUCCESS);
	311	packet_send();
	312	packet_write_wait();
	313	/* now we can break out */
	314	authctxt->success = 1;
	315	} else {
dfddba3d	316	if (authctxt->failures++ > options.max_authtries) {
	317	#ifdef SSH_AUDIT_EVENTS
	318	PRIVSEP(audit_event(SSH_LOGIN_EXCEED_MAXTRIES));
	319	#endif
3c0ef626	320	packet_disconnect(AUTH_FAIL_MSG, authctxt->user);
dfddba3d	321	}
3c0ef626	322	methods = authmethods_get();
	323	packet_start(SSH2_MSG_USERAUTH_FAILURE);
	324	packet_put_cstring(methods);
	325	packet_put_char(0); /* XXX partial success, unused */
	326	packet_send();
	327	packet_write_wait();
	328	xfree(methods);
	329	}
	330	}
	331
3c0ef626	332	#define DELIM ","
	333
	334	static char *
	335	authmethods_get(void)
	336	{
1e608e42	337	Buffer b;
3c0ef626	338	char *list;
44a053a3	339	int i;
3c0ef626	340
1e608e42	341	buffer_init(&b);
44a053a3	342	for (i = 0; authmethods[i] != NULL; i++) {
44a053a3	343	if (strcmp(authmethods[i]->name, "none") == 0)
3c0ef626	344	continue;
44a053a3	345	if (authmethods[i]->enabled != NULL &&
44a053a3	346	*(authmethods[i]->enabled) != 0) {
1e608e42	347	if (buffer_len(&b) > 0)
1e608e42	348	buffer_append(&b, ",", 1);
44a053a3	349	buffer_append(&b, authmethods[i]->name,
44a053a3	350	strlen(authmethods[i]->name));
3c0ef626	351	}
3c0ef626	352	}
1e608e42	353	buffer_append(&b, "\0", 1);
	354	list = xstrdup(buffer_ptr(&b));
	355	buffer_free(&b);
3c0ef626	356	return list;
	357	}
	358
	359	static Authmethod *
	360	authmethod_lookup(const char *name)
	361	{
44a053a3	362	int i;
44a053a3	363
3c0ef626	364	if (name != NULL)
44a053a3	365	for (i = 0; authmethods[i] != NULL; i++)
	366	if (authmethods[i]->enabled != NULL &&
	367	*(authmethods[i]->enabled) != 0 &&
	368	strcmp(name, authmethods[i]->name) == 0)
	369	return authmethods[i];
	370	debug2("Unrecognized authentication method name: %s",
	371	name ? name : "NULL");
3c0ef626	372	return NULL;
3c0ef626	373	}