[openssh.git] / auth2.c

/* $OpenBSD: auth2.c,v 1.117 2008/07/02 12:36:39 djm Exp $ */
/*
 * 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"

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/uio.h>

#include <fcntl.h>
#include <pwd.h>
#include <stdarg.h>
#include <string.h>
#include <unistd.h>

#include "xmalloc.h"
#include "ssh2.h"
#include "packet.h"
#include "log.h"
#include "buffer.h"
#include "servconf.h"
#include "compat.h"
#include "key.h"
#include "hostfile.h"
#include "auth.h"
#include "dispatch.h"
#include "pathnames.h"
#include "buffer.h"

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

/* 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_gssapi;
#endif

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

char *
auth2_read_banner(void)
{
	struct stat st;
	char *banner = NULL;
	size_t len, n;
	int fd;

	if ((fd = open(options.banner, O_RDONLY)) == -1)
		return (NULL);
	if (fstat(fd, &st) == -1) {
		close(fd);
		return (NULL);
	}
	if (st.st_size > 1*1024*1024) {
		close(fd);
		return (NULL);
	}

	len = (size_t)st.st_size;		/* truncate */
	banner = xmalloc(len + 1);
	n = atomicio(read, fd, banner, len);
	close(fd);

	if (n != len) {
		xfree(banner);
		return (NULL);
	}
	banner[n] = '\0';

	return (banner);
}

void
userauth_send_banner(const char *msg)
{
	if (datafellows & SSH_BUG_BANNER)
		return;

	packet_start(SSH2_MSG_USERAUTH_BANNER);
	packet_put_cstring(msg);
	packet_put_cstring("");		/* language, unused */
	packet_send();
	debug("%s: sent", __func__);
}

static void
userauth_banner(void)
{
	char *banner = NULL;

	if (options.banner == NULL ||
	    strcasecmp(options.banner, "none") == 0 ||
	    (datafellows & SSH_BUG_BANNER) != 0)
		return;

	if ((banner = PRIVSEP(auth2_read_banner())) == NULL)
		goto done;
	userauth_send_banner(banner);

done:
	if (banner)
		xfree(banner);
}

/*
 * loop until authctxt->success == TRUE
 */
void
do_authentication2(Authctxt *authctxt)
{
	dispatch_init(&dispatch_protocol_error);
	dispatch_set(SSH2_MSG_SERVICE_REQUEST, &input_service_request);
	dispatch_run(DISPATCH_BLOCK, &authctxt->success, authctxt);
}

/*ARGSUSED*/
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);
}

/*ARGSUSED*/
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);
	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));
		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);
		} else {
			logit("input_userauth_request: invalid user %s", user);
			authctxt->pw = fakepw();
#ifdef SSH_AUDIT_EVENTS
			PRIVSEP(audit_event(SSH_INVALID_USER));
#endif
		}
#ifdef USE_PAM
		if (options.use_pam)
			PRIVSEP(start_pam(authctxt));
#endif
		setproctitle("%s%s", authctxt->valid ? user : "unknown",
		    use_privsep ? " [net]" : "");
		authctxt->service = xstrdup(service);
		authctxt->style = style ? xstrdup(style) : NULL;
		if (use_privsep)
			mm_inform_authserv(service, style);
		userauth_banner();
	} 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 && authctxt->failures < options.max_authtries) {
		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);
	}
}

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
221fc73c	1	/* $OpenBSD: auth2.c,v 1.117 2008/07/02 12:36:39 djm Exp $ */
a306f2dd	2	/*
	3	* Copyright (c) 2000 Markus Friedl. All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
a306f2dd	13	*
	14	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	15	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	16	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	17	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	18	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	19	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	20	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	21	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	22	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	23	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	24	*/
bcbf86ec	25
a306f2dd	26	#include "includes.h"
a306f2dd	27
b1842393	28	#include <sys/types.h>
221fc73c	29	#include <sys/stat.h>
221fc73c	30	#include <sys/uio.h>
b1842393	31
221fc73c	32	#include <fcntl.h>
b1842393	33	#include <pwd.h>
31652869	34	#include <stdarg.h>
00146caa	35	#include <string.h>
221fc73c	36	#include <unistd.h>
b1842393	37
a306f2dd	38	#include "xmalloc.h"
31652869	39	#include "ssh2.h"
a306f2dd	40	#include "packet.h"
42f11eb2	41	#include "log.h"
31652869	42	#include "buffer.h"
a306f2dd	43	#include "servconf.h"
a306f2dd	44	#include "compat.h"
31652869	45	#include "key.h"
31652869	46	#include "hostfile.h"
a306f2dd	47	#include "auth.h"
a306f2dd	48	#include "dispatch.h"
42f11eb2	49	#include "pathnames.h"
ba6dd90e	50	#include "buffer.h"
a306f2dd	51
7364bd04	52	#ifdef GSSAPI
	53	#include "ssh-gss.h"
	54	#endif
31652869	55	#include "monitor_wrap.h"
7364bd04	56
a306f2dd	57	/* import */
a306f2dd	58	extern ServerOptions options;
1e3b8b07	59	extern u_char *session_id2;
a27002e5	60	extern u_int session_id2_len;
ba6dd90e	61	extern Buffer loginmsg;
a306f2dd	62
01c24737	63	/* methods */
	64
	65	extern Authmethod method_none;
	66	extern Authmethod method_pubkey;
	67	extern Authmethod method_passwd;
	68	extern Authmethod method_kbdint;
	69	extern Authmethod method_hostbased;
7364bd04	70	#ifdef GSSAPI
	71	extern Authmethod method_gssapi;
	72	#endif
01c24737	73
	74	Authmethod *authmethods[] = {
	75	&method_none,
	76	&method_pubkey,
7364bd04	77	#ifdef GSSAPI
	78	&method_gssapi,
	79	#endif
01c24737	80	&method_passwd,
	81	&method_kbdint,
	82	&method_hostbased,
	83	NULL
94ec8c6b	84	};
94ec8c6b	85
a306f2dd	86	/* protocol */
a306f2dd	87
7819b5c3	88	static void input_service_request(int, u_int32_t, void *);
7819b5c3	89	static void input_userauth_request(int, u_int32_t, void *);
a306f2dd	90
a306f2dd	91	/* helper */
396c147e	92	static Authmethod authmethod_lookup(const char );
ffb215be	93	static char *authmethods_get(void);
a306f2dd	94
221fc73c	95	char *
	96	auth2_read_banner(void)
	97	{
	98	struct stat st;
	99	char *banner = NULL;
	100	size_t len, n;
	101	int fd;
	102
	103	if ((fd = open(options.banner, O_RDONLY)) == -1)
	104	return (NULL);
	105	if (fstat(fd, &st) == -1) {
	106	close(fd);
	107	return (NULL);
	108	}
	109	if (st.st_size > 110241024) {
	110	close(fd);
	111	return (NULL);
	112	}
	113
	114	len = (size_t)st.st_size; /* truncate */
	115	banner = xmalloc(len + 1);
	116	n = atomicio(read, fd, banner, len);
	117	close(fd);
	118
	119	if (n != len) {
	120	xfree(banner);
	121	return (NULL);
	122	}
	123	banner[n] = '\0';
	124
	125	return (banner);
	126	}
	127
	128	void
	129	userauth_send_banner(const char *msg)
	130	{
	131	if (datafellows & SSH_BUG_BANNER)
	132	return;
	133
	134	packet_start(SSH2_MSG_USERAUTH_BANNER);
	135	packet_put_cstring(msg);
	136	packet_put_cstring(""); /* language, unused */
	137	packet_send();
	138	debug("%s: sent", __func__);
	139	}
	140
	141	static void
	142	userauth_banner(void)
	143	{
	144	char *banner = NULL;
	145
	146	if (options.banner == NULL \|\|
	147	strcasecmp(options.banner, "none") == 0 \|\|
	148	(datafellows & SSH_BUG_BANNER) != 0)
	149	return;
	150
	151	if ((banner = PRIVSEP(auth2_read_banner())) == NULL)
	152	goto done;
	153	userauth_send_banner(banner);
	154
	155	done:
	156	if (banner)
	157	xfree(banner);
	158	}
159
a306f2dd	160	/*
94ec8c6b	161	* loop until authctxt->success == TRUE
a306f2dd	162	*/
2362db19	163	void
2362db19	164	do_authentication2(Authctxt *authctxt)
a306f2dd	165	{
6367063f	166	dispatch_init(&dispatch_protocol_error);
a306f2dd	167	dispatch_set(SSH2_MSG_SERVICE_REQUEST, &input_service_request);
94ec8c6b	168	dispatch_run(DISPATCH_BLOCK, &authctxt->success, authctxt);
a306f2dd	169	}
a306f2dd	170
fe8c3af1	171	/ARGSUSED/
396c147e	172	static void
7819b5c3	173	input_service_request(int type, u_int32_t seq, void *ctxt)
a306f2dd	174	{
94ec8c6b	175	Authctxt *authctxt = ctxt;
1e3b8b07	176	u_int len;
7fdc56c5	177	int acceptit = 0;
a306f2dd	178	char *service = packet_get_string(&len);
95500969	179	packet_check_eom();
a306f2dd	180
94ec8c6b	181	if (authctxt == NULL)
	182	fatal("input_service_request: no authctxt");
	183
a306f2dd	184	if (strcmp(service, "ssh-userauth") == 0) {
94ec8c6b	185	if (!authctxt->success) {
7fdc56c5	186	acceptit = 1;
a306f2dd	187	/* now we can handle user-auth requests */
	188	dispatch_set(SSH2_MSG_USERAUTH_REQUEST, &input_userauth_request);
	189	}
	190	}
	191	/* XXX all other service requests are denied */
	192
7fdc56c5	193	if (acceptit) {
a306f2dd	194	packet_start(SSH2_MSG_SERVICE_ACCEPT);
	195	packet_put_cstring(service);
	196	packet_send();
	197	packet_write_wait();
	198	} else {
	199	debug("bad service request %s", service);
	200	packet_disconnect("bad service request %s", service);
	201	}
	202	xfree(service);
	203	}
	204
fe8c3af1	205	/ARGSUSED/
396c147e	206	static void
7819b5c3	207	input_userauth_request(int type, u_int32_t seq, void *ctxt)
a306f2dd	208	{
94ec8c6b	209	Authctxt *authctxt = ctxt;
94ec8c6b	210	Authmethod *m = NULL;
59c97189	211	char user, service, method, style = NULL;
a306f2dd	212	int authenticated = 0;
a306f2dd	213
94ec8c6b	214	if (authctxt == NULL)
94ec8c6b	215	fatal("input_userauth_request: no authctxt");
a306f2dd	216
94ec8c6b	217	user = packet_get_string(NULL);
	218	service = packet_get_string(NULL);
	219	method = packet_get_string(NULL);
	220	debug("userauth-request for user %s service %s method %s", user, service, method);
8abcdba4	221	debug("attempt %d failures %d", authctxt->attempt, authctxt->failures);
94ec8c6b	222
59c97189	223	if ((style = strchr(user, ':')) != NULL)
	224	*style++ = 0;
	225
2b87da3b	226	if (authctxt->attempt++ == 0) {
63284fbb	227	/* setup auth context */
f7ed12f1	228	authctxt->pw = PRIVSEP(getpwnamallow(user));
529d73ab	229	authctxt->user = xstrdup(user);
f7ed12f1	230	if (authctxt->pw && strcmp(service, "ssh-connection")==0) {
94ec8c6b	231	authctxt->valid = 1;
94ec8c6b	232	debug2("input_userauth_request: setting up authctxt for %s", user);
94ec8c6b	233	} else {
d77347cc	234	logit("input_userauth_request: invalid user %s", user);
96d0bf74	235	authctxt->pw = fakepw();
6039eeef	236	#ifdef SSH_AUDIT_EVENTS
6039eeef	237	PRIVSEP(audit_event(SSH_INVALID_USER));
04fc7a67	238	#endif
94ec8c6b	239	}
b6c37221	240	#ifdef USE_PAM
	241	if (options.use_pam)
	242	PRIVSEP(start_pam(authctxt));
	243	#endif
bd5c0694	244	setproctitle("%s%s", authctxt->valid ? user : "unknown",
1853d1ef	245	use_privsep ? " [net]" : "");
94ec8c6b	246	authctxt->service = xstrdup(service);
2a6a054e	247	authctxt->style = style ? xstrdup(style) : NULL;
1853d1ef	248	if (use_privsep)
1853d1ef	249	mm_inform_authserv(service, style);
221fc73c	250	userauth_banner();
2a6a054e	251	} else if (strcmp(user, authctxt->user) != 0 \|\|
	252	strcmp(service, authctxt->service) != 0) {
	253	packet_disconnect("Change of username or service not allowed: "
	254	"(%s,%s) -> (%s,%s)",
	255	authctxt->user, authctxt->service, user, service);
a306f2dd	256	}
59c97189	257	/* reset state */
2f293d43	258	auth2_challenge_stop(authctxt);
7364bd04	259
	260	#ifdef GSSAPI
	261	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, NULL);
	262	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE, NULL);
	263	#endif
	264
59c97189	265	authctxt->postponed = 0;
9cd45ea4	266
59c97189	267	/* try to authenticate user */
94ec8c6b	268	m = authmethod_lookup(method);
221fc73c	269	if (m != NULL && authctxt->failures < options.max_authtries) {
94ec8c6b	270	debug2("input_userauth_request: try method %s", method);
94ec8c6b	271	authenticated = m->userauth(authctxt);
9cd45ea4	272	}
d9cd3575	273	userauth_finish(authctxt, authenticated, method);
	274
	275	xfree(service);
	276	xfree(user);
	277	xfree(method);
	278	}
	279
	280	void
	281	userauth_finish(Authctxt authctxt, int authenticated, char method)
	282	{
4e81159c	283	char *methods;
4e81159c	284
59c97189	285	if (!authctxt->valid && authenticated)
	286	fatal("INTERNAL ERROR: authenticated invalid user %s",
	287	authctxt->user);
9cd45ea4	288
94ec8c6b	289	/* Special handling for root */
5d47f1d4	290	if (authenticated && authctxt->pw->pw_uid == 0 &&
c00e4d75	291	!auth_root_allowed(method)) {
a306f2dd	292	authenticated = 0;
6039eeef	293	#ifdef SSH_AUDIT_EVENTS
6039eeef	294	PRIVSEP(audit_event(SSH_LOGIN_ROOT_DENIED));
c00e4d75	295	#endif
c00e4d75	296	}
a306f2dd	297
5b9e2464	298	#ifdef USE_PAM
ba6dd90e	299	if (options.use_pam && authenticated) {
ba6dd90e	300	if (!PRIVSEP(do_pam_account())) {
ba6dd90e	301	/* if PAM returned a message, send it to the user */
	302	if (buffer_len(&loginmsg) > 0) {
	303	buffer_append(&loginmsg, "\0", 1);
	304	userauth_send_banner(buffer_ptr(&loginmsg));
9aab0af7	305	packet_write_wait();
ba6dd90e	306	}
9aab0af7	307	fatal("Access denied for user %s by PAM account "
98c044d0	308	"configuration", authctxt->user);
ba6dd90e	309	}
ba6dd90e	310	}
5b9e2464	311	#endif
5b9e2464	312
ef51930f	313	#ifdef _UNICOS
	314	if (authenticated && cray_access_denied(authctxt->user)) {
	315	authenticated = 0;
	316	fatal("Access denied for user %s.",authctxt->user);
	317	}
	318	#endif /* _UNICOS */
	319
94ec8c6b	320	/* Log before sending the reply */
59c97189	321	auth_log(authctxt, authenticated, method, " ssh2");
59c97189	322
4e81159c	323	if (authctxt->postponed)
	324	return;
	325
	326	/* XXX todo: check if multiple auth methods are needed */
	327	if (authenticated == 1) {
	328	/* turn off userauth */
6367063f	329	dispatch_set(SSH2_MSG_USERAUTH_REQUEST, &dispatch_protocol_ignore);
4e81159c	330	packet_start(SSH2_MSG_USERAUTH_SUCCESS);
	331	packet_send();
	332	packet_write_wait();
	333	/* now we can break out */
	334	authctxt->success = 1;
	335	} else {
221fc73c	336	if (++authctxt->failures > options.max_authtries) {
6039eeef	337	#ifdef SSH_AUDIT_EVENTS
6039eeef	338	PRIVSEP(audit_event(SSH_LOGIN_EXCEED_MAXTRIES));
c00e4d75	339	#endif
4e81159c	340	packet_disconnect(AUTH_FAIL_MSG, authctxt->user);
c00e4d75	341	}
4e81159c	342	methods = authmethods_get();
	343	packet_start(SSH2_MSG_USERAUTH_FAILURE);
	344	packet_put_cstring(methods);
	345	packet_put_char(0); /* XXX partial success, unused */
	346	packet_send();
	347	packet_write_wait();
	348	xfree(methods);
	349	}
94ec8c6b	350	}
94ec8c6b	351
ffb215be	352	static char *
94ec8c6b	353	authmethods_get(void)
a306f2dd	354	{
3469eac4	355	Buffer b;
94ec8c6b	356	char *list;
01c24737	357	int i;
94ec8c6b	358
3469eac4	359	buffer_init(&b);
01c24737	360	for (i = 0; authmethods[i] != NULL; i++) {
01c24737	361	if (strcmp(authmethods[i]->name, "none") == 0)
94ec8c6b	362	continue;
01c24737	363	if (authmethods[i]->enabled != NULL &&
01c24737	364	*(authmethods[i]->enabled) != 0) {
3469eac4	365	if (buffer_len(&b) > 0)
3469eac4	366	buffer_append(&b, ",", 1);
01c24737	367	buffer_append(&b, authmethods[i]->name,
01c24737	368	strlen(authmethods[i]->name));
a306f2dd	369	}
a306f2dd	370	}
3469eac4	371	buffer_append(&b, "\0", 1);
	372	list = xstrdup(buffer_ptr(&b));
	373	buffer_free(&b);
94ec8c6b	374	return list;
	375	}
	376
396c147e	377	static Authmethod *
94ec8c6b	378	authmethod_lookup(const char *name)
94ec8c6b	379	{
01c24737	380	int i;
01c24737	381
94ec8c6b	382	if (name != NULL)
01c24737	383	for (i = 0; authmethods[i] != NULL; i++)
	384	if (authmethods[i]->enabled != NULL &&
	385	*(authmethods[i]->enabled) != 0 &&
	386	strcmp(name, authmethods[i]->name) == 0)
	387	return authmethods[i];
	388	debug2("Unrecognized authentication method name: %s",
	389	name ? name : "NULL");
94ec8c6b	390	return NULL;
a306f2dd	391	}
221fc73c	392