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

/* $OpenBSD: auth2.c,v 1.113 2006/08/03 03:34:41 deraadt 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 <pwd.h>
#include <stdarg.h>
#include <string.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_external;
extern Authmethod method_gsskeyex;
extern Authmethod method_gssapi;
extern Authmethod method_gssapi_compat;
#endif

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

/*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);

#ifdef GSSAPI
	if (user[0] == '\0') {
	    debug("received empty username for %s", method);
	    if (strcmp(method, "external-keyx") == 0 ||
		strcmp(method, "gssapi-keyex") == 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");
		    packet_send_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 empty 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;
        authctxt->user = xstrdup(user);
        if (strcmp(service, "ssh-connection") != 0) {
            packet_disconnect("Unsupported service %s", service);
        }
#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();
		} else {
#endif
		authctxt->pw = PRIVSEP(getpwnamallow(user));
		if (authctxt->pw) {
			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 GSSAPI
		} /* endif for setting username based on GSSAPI context */
#endif
#ifdef USE_PAM
		if (options.use_pam)
			PRIVSEP(start_pam(authctxt));
#endif
		setproctitle("%s%s", authctxt->valid ? user : "unknown",
		    use_privsep ? " [net]" : "");
		if (authctxt->attempt == 1) {
            authctxt->service = xstrdup(service);
            authctxt->style = style ? xstrdup(style) : NULL;
            if (use_privsep)
                mm_inform_authserv(service, style);
		}
	}
	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;
	authctxt->server_caused_failure = 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 {
		/* Dont count server configuration issues against the client */
		if (!authctxt->server_caused_failure && 
		    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
30460aeb	1	/* $OpenBSD: auth2.c,v 1.113 2006/08/03 03:34:41 deraadt 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
30460aeb	28	#include <sys/types.h>
	29
	30	#include <pwd.h>
	31	#include <stdarg.h>
	32	#include <string.h>
	33
3c0ef626	34	#include "xmalloc.h"
30460aeb	35	#include "ssh2.h"
3c0ef626	36	#include "packet.h"
3c0ef626	37	#include "log.h"
30460aeb	38	#include "buffer.h"
3c0ef626	39	#include "servconf.h"
bddc9ab0	40	#include "compat.h"
30460aeb	41	#include "key.h"
30460aeb	42	#include "hostfile.h"
3c0ef626	43	#include "auth.h"
3c0ef626	44	#include "dispatch.h"
3c0ef626	45	#include "pathnames.h"
dfddba3d	46	#include "buffer.h"
3c0ef626	47
5598e598	48	#ifdef GSSAPI
	49	#include "ssh-gss.h"
	50	#endif
30460aeb	51	#include "monitor_wrap.h"
5598e598	52
3c0ef626	53	/* import */
	54	extern ServerOptions options;
	55	extern u_char *session_id2;
7cac2b65	56	extern u_int session_id2_len;
dfddba3d	57	extern Buffer loginmsg;
3c0ef626	58
44a053a3	59	/* methods */
	60
	61	extern Authmethod method_none;
44a053a3	62	extern Authmethod method_pubkey;
	63	extern Authmethod method_passwd;
	64	extern Authmethod method_kbdint;
	65	extern Authmethod method_hostbased;
db870295	66	#ifdef GSSAPI
db870295	67	extern Authmethod method_external;
fe4ad273	68	extern Authmethod method_gsskeyex;
db870295	69	extern Authmethod method_gssapi;
540d72c3	70	extern Authmethod method_gssapi_compat;
db870295	71	#endif
44a053a3	72
	73	Authmethod *authmethods[] = {
	74	&method_none,
44a053a3	75	&method_pubkey,
7cac2b65	76	#ifdef GSSAPI
fe4ad273	77	&method_gsskeyex,
540d72c3	78	&method_external,
7cac2b65	79	&method_gssapi,
540d72c3	80	&method_gssapi_compat,
7cac2b65	81	#endif
44a053a3	82	&method_passwd,
	83	&method_kbdint,
	84	&method_hostbased,
	85	NULL
3c0ef626	86	};
	87
	88	/* protocol */
	89
1e608e42	90	static void input_service_request(int, u_int32_t, void *);
1e608e42	91	static void input_userauth_request(int, u_int32_t, void *);
3c0ef626	92
	93	/* helper */
	94	static Authmethod authmethod_lookup(const char );
	95	static char *authmethods_get(void);
510132b6	96	int user_key_allowed(struct passwd , Key );
3c0ef626	97
3c0ef626	98	/*
	99	* loop until authctxt->success == TRUE
	100	*/
	101
540d72c3	102	void
540d72c3	103	do_authentication2(Authctxt *authctxt)
3c0ef626	104	{
3c0ef626	105	/* challenge-response is implemented via keyboard interactive */
	106	if (options.challenge_response_authentication)
	107	options.kbd_interactive_authentication = 1;
3c0ef626	108
1e608e42	109	dispatch_init(&dispatch_protocol_error);
3c0ef626	110	dispatch_set(SSH2_MSG_SERVICE_REQUEST, &input_service_request);
3c0ef626	111	dispatch_run(DISPATCH_BLOCK, &authctxt->success, authctxt);
3c0ef626	112	}
3c0ef626	113
30460aeb	114	/ARGSUSED/
3c0ef626	115	static void
1e608e42	116	input_service_request(int type, u_int32_t seq, void *ctxt)
3c0ef626	117	{
	118	Authctxt *authctxt = ctxt;
	119	u_int len;
d03f4262	120	int acceptit = 0;
3c0ef626	121	char *service = packet_get_string(&len);
1e608e42	122	packet_check_eom();
3c0ef626	123
	124	if (authctxt == NULL)
	125	fatal("input_service_request: no authctxt");
	126
	127	if (strcmp(service, "ssh-userauth") == 0) {
	128	if (!authctxt->success) {
d03f4262	129	acceptit = 1;
3c0ef626	130	/* now we can handle user-auth requests */
	131	dispatch_set(SSH2_MSG_USERAUTH_REQUEST, &input_userauth_request);
	132	}
	133	}
	134	/* XXX all other service requests are denied */
	135
d03f4262	136	if (acceptit) {
3c0ef626	137	packet_start(SSH2_MSG_SERVICE_ACCEPT);
	138	packet_put_cstring(service);
	139	packet_send();
	140	packet_write_wait();
	141	} else {
	142	debug("bad service request %s", service);
	143	packet_disconnect("bad service request %s", service);
	144	}
	145	xfree(service);
	146	}
	147
30460aeb	148	/ARGSUSED/
3c0ef626	149	static void
1e608e42	150	input_userauth_request(int type, u_int32_t seq, void *ctxt)
3c0ef626	151	{
	152	Authctxt *authctxt = ctxt;
	153	Authmethod *m = NULL;
	154	char user, service, method, style = NULL;
	155	int authenticated = 0;
	156
	157	if (authctxt == NULL)
	158	fatal("input_userauth_request: no authctxt");
	159
	160	user = packet_get_string(NULL);
	161	service = packet_get_string(NULL);
	162	method = packet_get_string(NULL);
73a68d83	163
305d07c0	164	#ifdef GSSAPI
8f3eb4db	165	if (user[0] == '\0') {
b8e8844a	166	debug("received empty username for %s", method);
fe4ad273	167	if (strcmp(method, "external-keyx") == 0 \|\|
fe4ad273	168	strcmp(method, "gssapi-keyex") == 0) {
b8e8844a	169	char *lname = NULL;
	170	PRIVSEP(ssh_gssapi_localname(&lname));
	171	if (lname && lname[0] != '\0') {
	172	xfree(user);
	173	user = lname;
	174	debug("set username to %s from gssapi context", user);
9ec9d5ad	175	} else {
b8e8844a	176	debug("failed to set username from gssapi context");
d9e17760	177	packet_send_debug("failed to set username from gssapi context");
b8e8844a	178	}
b59afbfe	179	}
	180	}
	181	#endif
73a68d83	182
b8e8844a	183	debug("userauth-request for user %s service %s method %s",
8f3eb4db	184	user[0] ? user : "<implicit>", service, method);
3c0ef626	185	debug("attempt %d failures %d", authctxt->attempt, authctxt->failures);
	186
	187	if ((style = strchr(user, ':')) != NULL)
	188	*style++ = 0;
	189
86a22a0a	190	/* If first time or username changed or empty username,
781f72b9	191	setup/reset authentication context. */
	192	if ((authctxt->attempt++ == 0) \|\|
	193	(strcmp(user, authctxt->user) != 0) \|\|
	194	(strcmp(user, "") == 0)) {
b59afbfe	195	if (authctxt->user) {
	196	xfree(authctxt->user);
	197	authctxt->user = NULL;
	198	}
b809a58e	199	authctxt->valid = 0;
86a22a0a	200	authctxt->user = xstrdup(user);
	201	if (strcmp(service, "ssh-connection") != 0) {
	202	packet_disconnect("Unsupported service %s", service);
	203	}
b8e8844a	204	#ifdef GSSAPI
9ec9d5ad	205	/* If we're going to set the username based on the
9ec9d5ad	206	GSSAPI context later, then wait until then to
8f3eb4db	207	verify it. Just put in placeholders for now. */
	208	if ((strcmp(user, "") == 0) &&
	209	((strcmp(method, "gssapi") == 0) \|\|
	210	(strcmp(method, "gssapi-with-mic") == 0))) {
	211	authctxt->pw = fakepw();
8f3eb4db	212	} else {
b8e8844a	213	#endif
510132b6	214	authctxt->pw = PRIVSEP(getpwnamallow(user));
86a22a0a	215	if (authctxt->pw) {
3c0ef626	216	authctxt->valid = 1;
3c0ef626	217	debug2("input_userauth_request: setting up authctxt for %s", user);
3c0ef626	218	} else {
7e82606e	219	logit("input_userauth_request: invalid user %s", user);
7cac2b65	220	authctxt->pw = fakepw();
dfddba3d	221	#ifdef SSH_AUDIT_EVENTS
dfddba3d	222	PRIVSEP(audit_event(SSH_INVALID_USER));
3c0ef626	223	#endif
3c0ef626	224	}
b8e8844a	225	#ifdef GSSAPI
9ec9d5ad	226	} /* endif for setting username based on GSSAPI context */
08822d99	227	#endif
	228	#ifdef USE_PAM
	229	if (options.use_pam)
	230	PRIVSEP(start_pam(authctxt));
b8e8844a	231	#endif
7e82606e	232	setproctitle("%s%s", authctxt->valid ? user : "unknown",
510132b6	233	use_privsep ? " [net]" : "");
88ca8dfd	234	if (authctxt->attempt == 1) {
86a22a0a	235	authctxt->service = xstrdup(service);
	236	authctxt->style = style ? xstrdup(style) : NULL;
	237	if (use_privsep)
	238	mm_inform_authserv(service, style);
	239	}
885ffc2b	240	}
885ffc2b	241	if (strcmp(service, authctxt->service) != 0) {
67b84e65	242	packet_disconnect("Change of service not allowed: "
	243	"(%s,%s) -> (%s,%s)",
	244	authctxt->user, authctxt->service, user, service);
3c0ef626	245	}
3c0ef626	246	/* reset state */
1e608e42	247	auth2_challenge_stop(authctxt);
5598e598	248
5598e598	249	#ifdef GSSAPI
1e608e42	250	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, NULL);
1e608e42	251	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE, NULL);
5598e598	252	#endif
5598e598	253
3c0ef626	254	authctxt->postponed = 0;
fe4ad273	255	authctxt->server_caused_failure = 0;
3c0ef626	256
	257	/* try to authenticate user */
	258	m = authmethod_lookup(method);
	259	if (m != NULL) {
	260	debug2("input_userauth_request: try method %s", method);
	261	authenticated = m->userauth(authctxt);
	262	}
	263	userauth_finish(authctxt, authenticated, method);
	264
	265	xfree(service);
	266	xfree(user);
	267	xfree(method);
	268	}
	269
	270	void
	271	userauth_finish(Authctxt authctxt, int authenticated, char method)
	272	{
	273	char *methods;
	274
	275	if (!authctxt->valid && authenticated)
	276	fatal("INTERNAL ERROR: authenticated invalid user %s",
	277	authctxt->user);
	278
	279	/* Special handling for root */
bfe49944	280	if (authenticated && authctxt->pw->pw_uid == 0 &&
dfddba3d	281	!auth_root_allowed(method)) {
3c0ef626	282	authenticated = 0;
dfddba3d	283	#ifdef SSH_AUDIT_EVENTS
	284	PRIVSEP(audit_event(SSH_LOGIN_ROOT_DENIED));
	285	#endif
	286	}
3c0ef626	287
3c0ef626	288	#ifdef USE_PAM
dfddba3d	289	if (options.use_pam && authenticated) {
	290	if (!PRIVSEP(do_pam_account())) {
	291	/* if PAM returned a message, send it to the user */
	292	if (buffer_len(&loginmsg) > 0) {
	293	buffer_append(&loginmsg, "\0", 1);
	294	userauth_send_banner(buffer_ptr(&loginmsg));
	295	packet_write_wait();
	296	}
	297	fatal("Access denied for user %s by PAM account "
2ce0bfe4	298	"configuration", authctxt->user);
dfddba3d	299	}
dfddba3d	300	}
7cac2b65	301	#endif
3c0ef626	302
d03f4262	303	#ifdef _UNICOS
	304	if (authenticated && cray_access_denied(authctxt->user)) {
	305	authenticated = 0;
	306	fatal("Access denied for user %s.",authctxt->user);
	307	}
	308	#endif /* _UNICOS */
	309
3c0ef626	310	/* Log before sending the reply */
	311	auth_log(authctxt, authenticated, method, " ssh2");
	312
	313	if (authctxt->postponed)
	314	return;
	315
	316	/* XXX todo: check if multiple auth methods are needed */
	317	if (authenticated == 1) {
	318	/* turn off userauth */
1e608e42	319	dispatch_set(SSH2_MSG_USERAUTH_REQUEST, &dispatch_protocol_ignore);
3c0ef626	320	packet_start(SSH2_MSG_USERAUTH_SUCCESS);
	321	packet_send();
	322	packet_write_wait();
	323	/* now we can break out */
	324	authctxt->success = 1;
	325	} else {
fe4ad273	326	/* Dont count server configuration issues against the client */
	327	if (!authctxt->server_caused_failure &&
	328	authctxt->failures++ > options.max_authtries) {
dfddba3d	329	#ifdef SSH_AUDIT_EVENTS
	330	PRIVSEP(audit_event(SSH_LOGIN_EXCEED_MAXTRIES));
	331	#endif
3c0ef626	332	packet_disconnect(AUTH_FAIL_MSG, authctxt->user);
dfddba3d	333	}
3c0ef626	334	methods = authmethods_get();
	335	packet_start(SSH2_MSG_USERAUTH_FAILURE);
	336	packet_put_cstring(methods);
	337	packet_put_char(0); /* XXX partial success, unused */
	338	packet_send();
	339	packet_write_wait();
	340	xfree(methods);
	341	}
	342	}
	343
3c0ef626	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	}