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

/* $OpenBSD: auth2-gss.c,v 1.16 2007/10/29 00:52:45 dtucker Exp $ */

/*
 * Copyright (c) 2001-2007 Simon Wilkinson. 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"

#ifdef GSSAPI

#include <sys/types.h>

#include <stdarg.h>

#include "xmalloc.h"
#include "key.h"
#include "hostfile.h"
#include "auth.h"
#include "ssh2.h"
#include "log.h"
#include "dispatch.h"
#include "buffer.h"
#include "servconf.h"
#include "packet.h"
#include "ssh-gss.h"
#include "monitor_wrap.h"

extern ServerOptions options;

static void input_gssapi_token(int type, u_int32_t plen, void *ctxt);
static void input_gssapi_mic(int type, u_int32_t plen, void *ctxt);
static void input_gssapi_exchange_complete(int type, u_int32_t plen, void *ctxt);
static void input_gssapi_errtok(int, u_int32_t, void *);

/* 
 * The 'gssapi_keyex' userauth mechanism.
 */
static int
userauth_gsskeyex(Authctxt *authctxt)
{
	int authenticated = 0;
	Buffer b;
	gss_buffer_desc mic, gssbuf;
	u_int len;

	mic.value = packet_get_string(&len);
	mic.length = len;

	packet_check_eom();

	ssh_gssapi_buildmic(&b, authctxt->user, authctxt->service,
	    "gssapi-keyex");

	gssbuf.value = buffer_ptr(&b);
	gssbuf.length = buffer_len(&b);

	/* gss_kex_context is NULL with privsep, so we can't check it here */
	if (!GSS_ERROR(PRIVSEP(ssh_gssapi_checkmic(gss_kex_context, 
	    &gssbuf, &mic))))
		authenticated = PRIVSEP(ssh_gssapi_userok(authctxt->user,
		    authctxt->pw));
	
	buffer_free(&b);
	xfree(mic.value);

	return (authenticated);
}

/*
 * We only support those mechanisms that we know about (ie ones that we know
 * how to check local user kuserok and the like)
 */
static int
userauth_gssapi(Authctxt *authctxt)
{
	gss_OID_desc goid = {0, NULL};
	Gssctxt *ctxt = NULL;
	int mechs;
	gss_OID_set supported;
	int present;
	OM_uint32 ms;
	u_int len;
	u_char *doid = NULL;

	if (!authctxt->valid || authctxt->user == NULL)
		return (0);

	mechs = packet_get_int();
	if (mechs == 0) {
		debug("Mechanism negotiation is not supported");
		return (0);
	}

	ssh_gssapi_supported_oids(&supported);
	do {
		mechs--;

		if (doid)
			xfree(doid);

		present = 0;
		doid = packet_get_string(&len);

		if (len > 2 && doid[0] == SSH_GSS_OIDTYPE &&
		    doid[1] == len - 2) {
			goid.elements = doid + 2;
			goid.length   = len - 2;
			gss_test_oid_set_member(&ms, &goid, supported,
			    &present);
		} else {
			logit("Badly formed OID received");
		}
	} while (mechs > 0 && !present);

	gss_release_oid_set(&ms, &supported);

	if (!present) {
		xfree(doid);
		authctxt->server_caused_failure = 1;
		return (0);
	}

	if (GSS_ERROR(PRIVSEP(ssh_gssapi_server_ctx(&ctxt, &goid)))) {
		if (ctxt != NULL)
			ssh_gssapi_delete_ctx(&ctxt);
		xfree(doid);
		authctxt->server_caused_failure = 1;
		return (0);
	}

	authctxt->methoddata = (void *)ctxt;

	packet_start(SSH2_MSG_USERAUTH_GSSAPI_RESPONSE);

	/* Return the OID that we received */
	packet_put_string(doid, len);

	packet_send();
	xfree(doid);

	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, &input_gssapi_token);
	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, &input_gssapi_errtok);
	authctxt->postponed = 1;

	return (0);
}

static void
input_gssapi_token(int type, u_int32_t plen, void *ctxt)
{
	Authctxt *authctxt = ctxt;
	Gssctxt *gssctxt;
	gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
	gss_buffer_desc recv_tok;
	OM_uint32 maj_status, min_status, flags;
	u_int len;

	if (authctxt == NULL || (authctxt->methoddata == NULL && !use_privsep))
		fatal("No authentication or GSSAPI context");

	gssctxt = authctxt->methoddata;
	recv_tok.value = packet_get_string(&len);
	recv_tok.length = len; /* u_int vs. size_t */

	packet_check_eom();

	maj_status = PRIVSEP(ssh_gssapi_accept_ctx(gssctxt, &recv_tok,
	    &send_tok, &flags));

	xfree(recv_tok.value);

	if (GSS_ERROR(maj_status)) {
		if (send_tok.length != 0) {
			packet_start(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK);
			packet_put_string(send_tok.value, send_tok.length);
			packet_send();
		}
		authctxt->postponed = 0;
		dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, NULL);
		userauth_finish(authctxt, 0, "gssapi-with-mic");
	} else {
		if (send_tok.length != 0) {
			packet_start(SSH2_MSG_USERAUTH_GSSAPI_TOKEN);
			packet_put_string(send_tok.value, send_tok.length);
			packet_send();
		}
		if (maj_status == GSS_S_COMPLETE) {
			dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, NULL);
			if (flags & GSS_C_INTEG_FLAG)
				dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_MIC,
				    &input_gssapi_mic);
			else
				dispatch_set(
				    SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE,
				    &input_gssapi_exchange_complete);
		}
	}

	gss_release_buffer(&min_status, &send_tok);
}

static void
input_gssapi_errtok(int type, u_int32_t plen, void *ctxt)
{
	Authctxt *authctxt = ctxt;
	Gssctxt *gssctxt;
	gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
	gss_buffer_desc recv_tok;
	OM_uint32 maj_status;
	u_int len;

	if (authctxt == NULL || (authctxt->methoddata == NULL && !use_privsep))
		fatal("No authentication or GSSAPI context");

	gssctxt = authctxt->methoddata;
	recv_tok.value = packet_get_string(&len);
	recv_tok.length = len;

	packet_check_eom();

	/* Push the error token into GSSAPI to see what it says */
	maj_status = PRIVSEP(ssh_gssapi_accept_ctx(gssctxt, &recv_tok,
	    &send_tok, NULL));

	xfree(recv_tok.value);

	/* We can't return anything to the client, even if we wanted to */
	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, NULL);
	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, NULL);

	/* The client will have already moved on to the next auth */

	gss_release_buffer(&maj_status, &send_tok);
}

/*
 * This is called when the client thinks we've completed authentication.
 * It should only be enabled in the dispatch handler by the function above,
 * which only enables it once the GSSAPI exchange is complete.
 */

static void
input_gssapi_exchange_complete(int type, u_int32_t plen, void *ctxt)
{
	Authctxt *authctxt = ctxt;
	Gssctxt *gssctxt;
	int authenticated;

	if (authctxt == NULL || (authctxt->methoddata == NULL && !use_privsep))
		fatal("No authentication or GSSAPI context");

	gssctxt = authctxt->methoddata;

	/*
	 * We don't need to check the status, because we're only enabled in
	 * the dispatcher once the exchange is complete
	 */

	packet_check_eom();

	authenticated = PRIVSEP(ssh_gssapi_userok(authctxt->user,
	    authctxt->pw));

	authctxt->postponed = 0;
	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, NULL);
	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, NULL);
	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_MIC, NULL);
	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE, NULL);
	userauth_finish(authctxt, authenticated, "gssapi-with-mic");
}

static void
input_gssapi_mic(int type, u_int32_t plen, void *ctxt)
{
	Authctxt *authctxt = ctxt;
	Gssctxt *gssctxt;
	int authenticated = 0;
	Buffer b;
	gss_buffer_desc mic, gssbuf;
	u_int len;

	if (authctxt == NULL || (authctxt->methoddata == NULL && !use_privsep))
		fatal("No authentication or GSSAPI context");

	gssctxt = authctxt->methoddata;

	mic.value = packet_get_string(&len);
	mic.length = len;

	ssh_gssapi_buildmic(&b, authctxt->user, authctxt->service,
	    "gssapi-with-mic");

	gssbuf.value = buffer_ptr(&b);
	gssbuf.length = buffer_len(&b);

	if (!GSS_ERROR(PRIVSEP(ssh_gssapi_checkmic(gssctxt, &gssbuf, &mic))))
		authenticated = 
		    PRIVSEP(ssh_gssapi_userok(authctxt->user, authctxt->pw));
	else
		logit("GSSAPI MIC check failed");

	buffer_free(&b);
	xfree(mic.value);

	authctxt->postponed = 0;
	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, NULL);
	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, NULL);
	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_MIC, NULL);
	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE, NULL);
	userauth_finish(authctxt, authenticated, "gssapi-with-mic");
}

Authmethod method_gsskeyex = {
	"gssapi-keyex",
	userauth_gsskeyex,
	&options.gss_authentication
};

Authmethod method_gssapi = {
	"gssapi-with-mic",
	userauth_gssapi,
	&options.gss_authentication
};

#endif /* GSSAPI */
Commit	Line	Data
47686178	1	/* $OpenBSD: auth2-gss.c,v 1.16 2007/10/29 00:52:45 dtucker Exp $ */
0fff78ff	2
0fff78ff	3	/*
f97edba6	4	* Copyright (c) 2001-2007 Simon Wilkinson. All rights reserved.
0fff78ff	5	*
	6	* Redistribution and use in source and binary forms, with or without
	7	* modification, are permitted provided that the following conditions
	8	* are met:
	9	* 1. Redistributions of source code must retain the above copyright
	10	* notice, this list of conditions and the following disclaimer.
	11	* 2. Redistributions in binary form must reproduce the above copyright
	12	* notice, this list of conditions and the following disclaimer in the
	13	* documentation and/or other materials provided with the distribution.
	14	*
	15	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AS IS'' AND ANY EXPRESS OR
	16	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	17	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	18	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	19	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	20	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	21	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	22	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	23	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	24	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	25	*/
	26
	27	#include "includes.h"
	28
	29	#ifdef GSSAPI
	30
9108f8d9	31	#include <sys/types.h>
	32
	33	#include <stdarg.h>
	34
	35	#include "xmalloc.h"
	36	#include "key.h"
	37	#include "hostfile.h"
0fff78ff	38	#include "auth.h"
0fff78ff	39	#include "ssh2.h"
0fff78ff	40	#include "log.h"
0fff78ff	41	#include "dispatch.h"
9108f8d9	42	#include "buffer.h"
0fff78ff	43	#include "servconf.h"
0fff78ff	44	#include "packet.h"
0fff78ff	45	#include "ssh-gss.h"
9108f8d9	46	#include "monitor_wrap.h"
0fff78ff	47
	48	extern ServerOptions options;
	49
	50	static void input_gssapi_token(int type, u_int32_t plen, void *ctxt);
cdd66111	51	static void input_gssapi_mic(int type, u_int32_t plen, void *ctxt);
0fff78ff	52	static void input_gssapi_exchange_complete(int type, u_int32_t plen, void *ctxt);
	53	static void input_gssapi_errtok(int, u_int32_t, void *);
	54
f97edba6	55	/*
	56	* The 'gssapi_keyex' userauth mechanism.
	57	*/
	58	static int
	59	userauth_gsskeyex(Authctxt *authctxt)
	60	{
	61	int authenticated = 0;
	62	Buffer b;
	63	gss_buffer_desc mic, gssbuf;
	64	u_int len;
	65
	66	mic.value = packet_get_string(&len);
	67	mic.length = len;
	68
	69	packet_check_eom();
	70
	71	ssh_gssapi_buildmic(&b, authctxt->user, authctxt->service,
	72	"gssapi-keyex");
	73
	74	gssbuf.value = buffer_ptr(&b);
	75	gssbuf.length = buffer_len(&b);
	76
	77	/* gss_kex_context is NULL with privsep, so we can't check it here */
	78	if (!GSS_ERROR(PRIVSEP(ssh_gssapi_checkmic(gss_kex_context,
	79	&gssbuf, &mic))))
	80	authenticated = PRIVSEP(ssh_gssapi_userok(authctxt->user,
	81	authctxt->pw));
	82
	83	buffer_free(&b);
	84	xfree(mic.value);
	85
	86	return (authenticated);
	87	}
	88
0fff78ff	89	/*
0fff78ff	90	* We only support those mechanisms that we know about (ie ones that we know
2c06c99b	91	* how to check local user kuserok and the like)
0fff78ff	92	*/
	93	static int
	94	userauth_gssapi(Authctxt *authctxt)
	95	{
c9f39d2c	96	gss_OID_desc goid = {0, NULL};
0fff78ff	97	Gssctxt *ctxt = NULL;
	98	int mechs;
	99	gss_OID_set supported;
	100	int present;
	101	OM_uint32 ms;
	102	u_int len;
665a873d	103	u_char *doid = NULL;
0fff78ff	104
	105	if (!authctxt->valid \|\| authctxt->user == NULL)
	106	return (0);
	107
	108	mechs = packet_get_int();
	109	if (mechs == 0) {
	110	debug("Mechanism negotiation is not supported");
	111	return (0);
	112	}
	113
	114	ssh_gssapi_supported_oids(&supported);
	115	do {
	116	mechs--;
	117
	118	if (doid)
	119	xfree(doid);
	120
cdd66111	121	present = 0;
0fff78ff	122	doid = packet_get_string(&len);
0fff78ff	123
665a873d	124	if (len > 2 && doid[0] == SSH_GSS_OIDTYPE &&
665a873d	125	doid[1] == len - 2) {
c9f39d2c	126	goid.elements = doid + 2;
	127	goid.length = len - 2;
	128	gss_test_oid_set_member(&ms, &goid, supported,
cdd66111	129	&present);
	130	} else {
	131	logit("Badly formed OID received");
0fff78ff	132	}
0fff78ff	133	} while (mechs > 0 && !present);
	134
	135	gss_release_oid_set(&ms, &supported);
	136
	137	if (!present) {
	138	xfree(doid);
f97edba6	139	authctxt->server_caused_failure = 1;
0fff78ff	140	return (0);
	141	}
	142
c9f39d2c	143	if (GSS_ERROR(PRIVSEP(ssh_gssapi_server_ctx(&ctxt, &goid)))) {
9108f8d9	144	if (ctxt != NULL)
9108f8d9	145	ssh_gssapi_delete_ctx(&ctxt);
0fff78ff	146	xfree(doid);
f97edba6	147	authctxt->server_caused_failure = 1;
0fff78ff	148	return (0);
	149	}
	150
2c06c99b	151	authctxt->methoddata = (void *)ctxt;
0fff78ff	152
	153	packet_start(SSH2_MSG_USERAUTH_GSSAPI_RESPONSE);
	154
cdd66111	155	/* Return the OID that we received */
0fff78ff	156	packet_put_string(doid, len);
	157
	158	packet_send();
	159	xfree(doid);
	160
	161	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, &input_gssapi_token);
	162	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, &input_gssapi_errtok);
	163	authctxt->postponed = 1;
	164
	165	return (0);
	166	}
	167
	168	static void
	169	input_gssapi_token(int type, u_int32_t plen, void *ctxt)
	170	{
	171	Authctxt *authctxt = ctxt;
	172	Gssctxt *gssctxt;
	173	gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
	174	gss_buffer_desc recv_tok;
cdd66111	175	OM_uint32 maj_status, min_status, flags;
0fff78ff	176	u_int len;
	177
	178	if (authctxt == NULL \|\| (authctxt->methoddata == NULL && !use_privsep))
	179	fatal("No authentication or GSSAPI context");
	180
	181	gssctxt = authctxt->methoddata;
	182	recv_tok.value = packet_get_string(&len);
	183	recv_tok.length = len; /* u_int vs. size_t */
	184
	185	packet_check_eom();
	186
	187	maj_status = PRIVSEP(ssh_gssapi_accept_ctx(gssctxt, &recv_tok,
cdd66111	188	&send_tok, &flags));
0fff78ff	189
	190	xfree(recv_tok.value);
	191
	192	if (GSS_ERROR(maj_status)) {
	193	if (send_tok.length != 0) {
	194	packet_start(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK);
	195	packet_put_string(send_tok.value, send_tok.length);
	196	packet_send();
	197	}
	198	authctxt->postponed = 0;
	199	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, NULL);
cdd66111	200	userauth_finish(authctxt, 0, "gssapi-with-mic");
0fff78ff	201	} else {
	202	if (send_tok.length != 0) {
	203	packet_start(SSH2_MSG_USERAUTH_GSSAPI_TOKEN);
	204	packet_put_string(send_tok.value, send_tok.length);
	205	packet_send();
	206	}
	207	if (maj_status == GSS_S_COMPLETE) {
	208	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, NULL);
cdd66111	209	if (flags & GSS_C_INTEG_FLAG)
	210	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_MIC,
	211	&input_gssapi_mic);
	212	else
	213	dispatch_set(
	214	SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE,
	215	&input_gssapi_exchange_complete);
0fff78ff	216	}
	217	}
	218
	219	gss_release_buffer(&min_status, &send_tok);
	220	}
	221
	222	static void
	223	input_gssapi_errtok(int type, u_int32_t plen, void *ctxt)
	224	{
	225	Authctxt *authctxt = ctxt;
	226	Gssctxt *gssctxt;
	227	gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
	228	gss_buffer_desc recv_tok;
	229	OM_uint32 maj_status;
	230	u_int len;
	231
	232	if (authctxt == NULL \|\| (authctxt->methoddata == NULL && !use_privsep))
	233	fatal("No authentication or GSSAPI context");
	234
	235	gssctxt = authctxt->methoddata;
	236	recv_tok.value = packet_get_string(&len);
	237	recv_tok.length = len;
	238
	239	packet_check_eom();
	240
	241	/* Push the error token into GSSAPI to see what it says */
	242	maj_status = PRIVSEP(ssh_gssapi_accept_ctx(gssctxt, &recv_tok,
	243	&send_tok, NULL));
	244
	245	xfree(recv_tok.value);
	246
	247	/* We can't return anything to the client, even if we wanted to */
	248	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, NULL);
	249	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, NULL);
	250
	251	/* The client will have already moved on to the next auth */
	252
	253	gss_release_buffer(&maj_status, &send_tok);
	254	}
	255
	256	/*
	257	* This is called when the client thinks we've completed authentication.
	258	* It should only be enabled in the dispatch handler by the function above,
	259	* which only enables it once the GSSAPI exchange is complete.
	260	*/
	261
	262	static void
	263	input_gssapi_exchange_complete(int type, u_int32_t plen, void *ctxt)
	264	{
	265	Authctxt *authctxt = ctxt;
	266	Gssctxt *gssctxt;
	267	int authenticated;
	268
	269	if (authctxt == NULL \|\| (authctxt->methoddata == NULL && !use_privsep))
	270	fatal("No authentication or GSSAPI context");
	271
	272	gssctxt = authctxt->methoddata;
	273
	274	/*
cdd66111	275	* We don't need to check the status, because we're only enabled in
cdd66111	276	* the dispatcher once the exchange is complete
0fff78ff	277	*/
	278
	279	packet_check_eom();
	280
f97edba6	281	authenticated = PRIVSEP(ssh_gssapi_userok(authctxt->user,
f97edba6	282	authctxt->pw));
0fff78ff	283
	284	authctxt->postponed = 0;
	285	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, NULL);
	286	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, NULL);
cdd66111	287	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_MIC, NULL);
	288	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE, NULL);
	289	userauth_finish(authctxt, authenticated, "gssapi-with-mic");
	290	}
	291
	292	static void
	293	input_gssapi_mic(int type, u_int32_t plen, void *ctxt)
	294	{
	295	Authctxt *authctxt = ctxt;
	296	Gssctxt *gssctxt;
	297	int authenticated = 0;
	298	Buffer b;
	299	gss_buffer_desc mic, gssbuf;
	300	u_int len;
	301
	302	if (authctxt == NULL \|\| (authctxt->methoddata == NULL && !use_privsep))
	303	fatal("No authentication or GSSAPI context");
	304
	305	gssctxt = authctxt->methoddata;
	306
	307	mic.value = packet_get_string(&len);
	308	mic.length = len;
	309
	310	ssh_gssapi_buildmic(&b, authctxt->user, authctxt->service,
	311	"gssapi-with-mic");
	312
	313	gssbuf.value = buffer_ptr(&b);
	314	gssbuf.length = buffer_len(&b);
	315
	316	if (!GSS_ERROR(PRIVSEP(ssh_gssapi_checkmic(gssctxt, &gssbuf, &mic))))
f97edba6	317	authenticated =
f97edba6	318	PRIVSEP(ssh_gssapi_userok(authctxt->user, authctxt->pw));
cdd66111	319	else
	320	logit("GSSAPI MIC check failed");
	321
	322	buffer_free(&b);
	323	xfree(mic.value);
	324
	325	authctxt->postponed = 0;
	326	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, NULL);
	327	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, NULL);
	328	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_MIC, NULL);
0fff78ff	329	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE, NULL);
cdd66111	330	userauth_finish(authctxt, authenticated, "gssapi-with-mic");
0fff78ff	331	}
0fff78ff	332
f97edba6	333	Authmethod method_gsskeyex = {
	334	"gssapi-keyex",
	335	userauth_gsskeyex,
	336	&options.gss_authentication
	337	};
	338
0fff78ff	339	Authmethod method_gssapi = {
cdd66111	340	"gssapi-with-mic",
0fff78ff	341	userauth_gssapi,
	342	&options.gss_authentication
	343	};
	344
	345	#endif /* GSSAPI */