[gssapi-openssh.git] / openssh / auth2.c

/* $OpenBSD: auth2.c,v 1.120 2008/11/04 08:22:12 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 "atomicio.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_gsskeyex;
extern Authmethod method_gssapi;
#endif
#ifdef JPAKE
extern Authmethod method_jpake;
#endif

Authmethod *authmethods[] = {
	&method_none,
	&method_pubkey,
#ifdef GSSAPI
	&method_gsskeyex,
	&method_gssapi,
#endif
#ifdef JPAKE
	&method_jpake,
#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 JPAKE
	auth2_jpake_stop(authctxt);
#endif

#ifdef GSSAPI
	/* XXX move to auth2_gssapi_stop() */
	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, NULL);
	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE, NULL);
#endif

	authctxt->postponed = 0;
	authctxt->server_caused_failure = 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 {

		/* Allow initial try of "none" auth without failure penalty */
		if (!authctxt->server_caused_failure &&
		    (authctxt->attempt > 1 || strcmp(method, "none") != 0))
			authctxt->failures++;
		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
91d9cdd3	1	/* $OpenBSD: auth2.c,v 1.120 2008/11/04 08:22:12 djm Exp $ */
3c0ef626	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.
	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	*/
	25
	26	#include "includes.h"
3c0ef626	27
9108f8d9	28	#include <sys/types.h>
22616013	29	#include <sys/stat.h>
22616013	30	#include <sys/uio.h>
9108f8d9	31
22616013	32	#include <fcntl.h>
9108f8d9	33	#include <pwd.h>
	34	#include <stdarg.h>
	35	#include <string.h>
22616013	36	#include <unistd.h>
9108f8d9	37
3c0ef626	38	#include "xmalloc.h"
22616013	39	#include "atomicio.h"
9108f8d9	40	#include "ssh2.h"
3c0ef626	41	#include "packet.h"
3c0ef626	42	#include "log.h"
9108f8d9	43	#include "buffer.h"
3c0ef626	44	#include "servconf.h"
3c0ef626	45	#include "compat.h"
9108f8d9	46	#include "key.h"
9108f8d9	47	#include "hostfile.h"
3c0ef626	48	#include "auth.h"
3c0ef626	49	#include "dispatch.h"
3c0ef626	50	#include "pathnames.h"
996d5e62	51	#include "buffer.h"
3c0ef626	52
0fff78ff	53	#ifdef GSSAPI
	54	#include "ssh-gss.h"
	55	#endif
9108f8d9	56	#include "monitor_wrap.h"
0fff78ff	57
3c0ef626	58	/* import */
	59	extern ServerOptions options;
	60	extern u_char *session_id2;
0fff78ff	61	extern u_int session_id2_len;
996d5e62	62	extern Buffer loginmsg;
3c0ef626	63
f5799ae1	64	/* methods */
	65
	66	extern Authmethod method_none;
	67	extern Authmethod method_pubkey;
	68	extern Authmethod method_passwd;
	69	extern Authmethod method_kbdint;
	70	extern Authmethod method_hostbased;
0fff78ff	71	#ifdef GSSAPI
f97edba6	72	extern Authmethod method_gsskeyex;
0fff78ff	73	extern Authmethod method_gssapi;
0fff78ff	74	#endif
91d9cdd3	75	#ifdef JPAKE
	76	extern Authmethod method_jpake;
	77	#endif
f5799ae1	78
	79	Authmethod *authmethods[] = {
	80	&method_none,
	81	&method_pubkey,
0fff78ff	82	#ifdef GSSAPI
f97edba6	83	&method_gsskeyex,
0fff78ff	84	&method_gssapi,
91d9cdd3	85	#endif
	86	#ifdef JPAKE
	87	&method_jpake,
0fff78ff	88	#endif
f5799ae1	89	&method_passwd,
	90	&method_kbdint,
	91	&method_hostbased,
	92	NULL
3c0ef626	93	};
	94
	95	/* protocol */
	96
e9a17296	97	static void input_service_request(int, u_int32_t, void *);
e9a17296	98	static void input_userauth_request(int, u_int32_t, void *);
3c0ef626	99
	100	/* helper */
	101	static Authmethod authmethod_lookup(const char );
	102	static char *authmethods_get(void);
3c0ef626	103
22616013	104	char *
	105	auth2_read_banner(void)
	106	{
	107	struct stat st;
	108	char *banner = NULL;
	109	size_t len, n;
	110	int fd;
	111
	112	if ((fd = open(options.banner, O_RDONLY)) == -1)
	113	return (NULL);
	114	if (fstat(fd, &st) == -1) {
	115	close(fd);
	116	return (NULL);
	117	}
	118	if (st.st_size > 110241024) {
	119	close(fd);
	120	return (NULL);
	121	}
	122
	123	len = (size_t)st.st_size; /* truncate */
	124	banner = xmalloc(len + 1);
	125	n = atomicio(read, fd, banner, len);
	126	close(fd);
	127
	128	if (n != len) {
	129	xfree(banner);
	130	return (NULL);
	131	}
	132	banner[n] = '\0';
	133
	134	return (banner);
	135	}
	136
	137	void
	138	userauth_send_banner(const char *msg)
	139	{
	140	if (datafellows & SSH_BUG_BANNER)
	141	return;
	142
	143	packet_start(SSH2_MSG_USERAUTH_BANNER);
	144	packet_put_cstring(msg);
	145	packet_put_cstring(""); /* language, unused */
	146	packet_send();
	147	debug("%s: sent", __func__);
	148	}
	149
	150	static void
	151	userauth_banner(void)
	152	{
	153	char *banner = NULL;
	154
	155	if (options.banner == NULL \|\|
	156	strcasecmp(options.banner, "none") == 0 \|\|
	157	(datafellows & SSH_BUG_BANNER) != 0)
	158	return;
	159
	160	if ((banner = PRIVSEP(auth2_read_banner())) == NULL)
	161	goto done;
	162	userauth_send_banner(banner);
	163
	164	done:
	165	if (banner)
	166	xfree(banner);
	167	}
168
3c0ef626	169	/*
	170	* loop until authctxt->success == TRUE
	171	*/
cdd66111	172	void
cdd66111	173	do_authentication2(Authctxt *authctxt)
3c0ef626	174	{
e9a17296	175	dispatch_init(&dispatch_protocol_error);
3c0ef626	176	dispatch_set(SSH2_MSG_SERVICE_REQUEST, &input_service_request);
3c0ef626	177	dispatch_run(DISPATCH_BLOCK, &authctxt->success, authctxt);
3c0ef626	178	}
3c0ef626	179
9108f8d9	180	/ARGSUSED/
3c0ef626	181	static void
e9a17296	182	input_service_request(int type, u_int32_t seq, void *ctxt)
3c0ef626	183	{
	184	Authctxt *authctxt = ctxt;
	185	u_int len;
41b2f314	186	int acceptit = 0;
3c0ef626	187	char *service = packet_get_string(&len);
e9a17296	188	packet_check_eom();
3c0ef626	189
	190	if (authctxt == NULL)
	191	fatal("input_service_request: no authctxt");
	192
	193	if (strcmp(service, "ssh-userauth") == 0) {
	194	if (!authctxt->success) {
41b2f314	195	acceptit = 1;
3c0ef626	196	/* now we can handle user-auth requests */
	197	dispatch_set(SSH2_MSG_USERAUTH_REQUEST, &input_userauth_request);
	198	}
	199	}
	200	/* XXX all other service requests are denied */
	201
41b2f314	202	if (acceptit) {
3c0ef626	203	packet_start(SSH2_MSG_SERVICE_ACCEPT);
	204	packet_put_cstring(service);
	205	packet_send();
	206	packet_write_wait();
	207	} else {
	208	debug("bad service request %s", service);
	209	packet_disconnect("bad service request %s", service);
	210	}
	211	xfree(service);
	212	}
	213
9108f8d9	214	/ARGSUSED/
3c0ef626	215	static void
e9a17296	216	input_userauth_request(int type, u_int32_t seq, void *ctxt)
3c0ef626	217	{
	218	Authctxt *authctxt = ctxt;
	219	Authmethod *m = NULL;
	220	char user, service, method, style = NULL;
	221	int authenticated = 0;
	222
	223	if (authctxt == NULL)
	224	fatal("input_userauth_request: no authctxt");
	225
	226	user = packet_get_string(NULL);
	227	service = packet_get_string(NULL);
	228	method = packet_get_string(NULL);
	229	debug("userauth-request for user %s service %s method %s", user, service, method);
	230	debug("attempt %d failures %d", authctxt->attempt, authctxt->failures);
	231
	232	if ((style = strchr(user, ':')) != NULL)
	233	*style++ = 0;
	234
	235	if (authctxt->attempt++ == 0) {
	236	/* setup auth context */
700318f3	237	authctxt->pw = PRIVSEP(getpwnamallow(user));
99be0775	238	authctxt->user = xstrdup(user);
700318f3	239	if (authctxt->pw && strcmp(service, "ssh-connection")==0) {
3c0ef626	240	authctxt->valid = 1;
3c0ef626	241	debug2("input_userauth_request: setting up authctxt for %s", user);
3c0ef626	242	} else {
c9f39d2c	243	logit("input_userauth_request: invalid user %s", user);
0fff78ff	244	authctxt->pw = fakepw();
996d5e62	245	#ifdef SSH_AUDIT_EVENTS
996d5e62	246	PRIVSEP(audit_event(SSH_INVALID_USER));
3c0ef626	247	#endif
3c0ef626	248	}
2c06c99b	249	#ifdef USE_PAM
	250	if (options.use_pam)
	251	PRIVSEP(start_pam(authctxt));
	252	#endif
c9f39d2c	253	setproctitle("%s%s", authctxt->valid ? user : "unknown",
700318f3	254	use_privsep ? " [net]" : "");
3c0ef626	255	authctxt->service = xstrdup(service);
3c0ef626	256	authctxt->style = style ? xstrdup(style) : NULL;
700318f3	257	if (use_privsep)
700318f3	258	mm_inform_authserv(service, style);
22616013	259	userauth_banner();
3c0ef626	260	} else if (strcmp(user, authctxt->user) != 0 \|\|
	261	strcmp(service, authctxt->service) != 0) {
	262	packet_disconnect("Change of username or service not allowed: "
	263	"(%s,%s) -> (%s,%s)",
	264	authctxt->user, authctxt->service, user, service);
	265	}
	266	/* reset state */
e9a17296	267	auth2_challenge_stop(authctxt);
91d9cdd3	268	#ifdef JPAKE
	269	auth2_jpake_stop(authctxt);
	270	#endif
0fff78ff	271
0fff78ff	272	#ifdef GSSAPI
91d9cdd3	273	/* XXX move to auth2_gssapi_stop() */
0fff78ff	274	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, NULL);
	275	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE, NULL);
	276	#endif
	277
3c0ef626	278	authctxt->postponed = 0;
f97edba6	279	authctxt->server_caused_failure = 0;
3c0ef626	280
	281	/* try to authenticate user */
	282	m = authmethod_lookup(method);
22616013	283	if (m != NULL && authctxt->failures < options.max_authtries) {
3c0ef626	284	debug2("input_userauth_request: try method %s", method);
	285	authenticated = m->userauth(authctxt);
	286	}
	287	userauth_finish(authctxt, authenticated, method);
	288
	289	xfree(service);
	290	xfree(user);
	291	xfree(method);
	292	}
	293
	294	void
	295	userauth_finish(Authctxt authctxt, int authenticated, char method)
	296	{
	297	char *methods;
	298
	299	if (!authctxt->valid && authenticated)
	300	fatal("INTERNAL ERROR: authenticated invalid user %s",
	301	authctxt->user);
	302
	303	/* Special handling for root */
6a9b3198	304	if (authenticated && authctxt->pw->pw_uid == 0 &&
996d5e62	305	!auth_root_allowed(method)) {
3c0ef626	306	authenticated = 0;
996d5e62	307	#ifdef SSH_AUDIT_EVENTS
	308	PRIVSEP(audit_event(SSH_LOGIN_ROOT_DENIED));
	309	#endif
	310	}
3c0ef626	311
3c0ef626	312	#ifdef USE_PAM
996d5e62	313	if (options.use_pam && authenticated) {
	314	if (!PRIVSEP(do_pam_account())) {
	315	/* if PAM returned a message, send it to the user */
	316	if (buffer_len(&loginmsg) > 0) {
	317	buffer_append(&loginmsg, "\0", 1);
	318	userauth_send_banner(buffer_ptr(&loginmsg));
	319	packet_write_wait();
	320	}
	321	fatal("Access denied for user %s by PAM account "
665a873d	322	"configuration", authctxt->user);
996d5e62	323	}
996d5e62	324	}
0fff78ff	325	#endif
3c0ef626	326
41b2f314	327	#ifdef _UNICOS
	328	if (authenticated && cray_access_denied(authctxt->user)) {
	329	authenticated = 0;
	330	fatal("Access denied for user %s.",authctxt->user);
	331	}
	332	#endif /* _UNICOS */
	333
3c0ef626	334	/* Log before sending the reply */
	335	auth_log(authctxt, authenticated, method, " ssh2");
	336
	337	if (authctxt->postponed)
	338	return;
	339
	340	/* XXX todo: check if multiple auth methods are needed */
	341	if (authenticated == 1) {
	342	/* turn off userauth */
e9a17296	343	dispatch_set(SSH2_MSG_USERAUTH_REQUEST, &dispatch_protocol_ignore);
3c0ef626	344	packet_start(SSH2_MSG_USERAUTH_SUCCESS);
	345	packet_send();
	346	packet_write_wait();
	347	/* now we can break out */
	348	authctxt->success = 1;
	349	} else {
22616013	350
22616013	351	/* Allow initial try of "none" auth without failure penalty */
f97edba6	352	if (!authctxt->server_caused_failure &&
f97edba6	353	(authctxt->attempt > 1 \|\| strcmp(method, "none") != 0))
22616013	354	authctxt->failures++;
22616013	355	if (authctxt->failures >= options.max_authtries) {
996d5e62	356	#ifdef SSH_AUDIT_EVENTS
	357	PRIVSEP(audit_event(SSH_LOGIN_EXCEED_MAXTRIES));
	358	#endif
3c0ef626	359	packet_disconnect(AUTH_FAIL_MSG, authctxt->user);
996d5e62	360	}
3c0ef626	361	methods = authmethods_get();
	362	packet_start(SSH2_MSG_USERAUTH_FAILURE);
	363	packet_put_cstring(methods);
	364	packet_put_char(0); /* XXX partial success, unused */
	365	packet_send();
	366	packet_write_wait();
	367	xfree(methods);
	368	}
	369	}
	370
3c0ef626	371	static char *
	372	authmethods_get(void)
	373	{
e9a17296	374	Buffer b;
3c0ef626	375	char *list;
f5799ae1	376	int i;
3c0ef626	377
e9a17296	378	buffer_init(&b);
f5799ae1	379	for (i = 0; authmethods[i] != NULL; i++) {
f5799ae1	380	if (strcmp(authmethods[i]->name, "none") == 0)
3c0ef626	381	continue;
f5799ae1	382	if (authmethods[i]->enabled != NULL &&
f5799ae1	383	*(authmethods[i]->enabled) != 0) {
e9a17296	384	if (buffer_len(&b) > 0)
e9a17296	385	buffer_append(&b, ",", 1);
f5799ae1	386	buffer_append(&b, authmethods[i]->name,
f5799ae1	387	strlen(authmethods[i]->name));
3c0ef626	388	}
3c0ef626	389	}
e9a17296	390	buffer_append(&b, "\0", 1);
	391	list = xstrdup(buffer_ptr(&b));
	392	buffer_free(&b);
3c0ef626	393	return list;
	394	}
	395
	396	static Authmethod *
	397	authmethod_lookup(const char *name)
	398	{
f5799ae1	399	int i;
f5799ae1	400
3c0ef626	401	if (name != NULL)
f5799ae1	402	for (i = 0; authmethods[i] != NULL; i++)
	403	if (authmethods[i]->enabled != NULL &&
	404	*(authmethods[i]->enabled) != 0 &&
	405	strcmp(name, authmethods[i]->name) == 0)
	406	return authmethods[i];
	407	debug2("Unrecognized authentication method name: %s",
	408	name ? name : "NULL");
3c0ef626	409	return NULL;
3c0ef626	410	}
22616013	411