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

/* $OpenBSD: auth2-gss.c,v 1.15 2006/08/03 03:34:41 deraadt Exp $ */

/*
 * Copyright (c) 2001-2003 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));
	
	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->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));
	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
9108f8d9	1	/* $OpenBSD: auth2-gss.c,v 1.15 2006/08/03 03:34:41 deraadt Exp $ */
0fff78ff	2
	3	/*
	4	* Copyright (c) 2001-2003 Simon Wilkinson. All rights reserved.
	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
d617aef3	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
	82	buffer_free(&b);
	83	xfree(mic.value);
	84
	85	return (authenticated);
	86	}
	87
0fff78ff	88	/*
0fff78ff	89	* We only support those mechanisms that we know about (ie ones that we know
2c06c99b	90	* how to check local user kuserok and the like)
0fff78ff	91	*/
	92	static int
	93	userauth_gssapi(Authctxt *authctxt)
	94	{
c9f39d2c	95	gss_OID_desc goid = {0, NULL};
0fff78ff	96	Gssctxt *ctxt = NULL;
	97	int mechs;
	98	gss_OID_set supported;
	99	int present;
	100	OM_uint32 ms;
	101	u_int len;
665a873d	102	u_char *doid = NULL;
0fff78ff	103
	104	if (!authctxt->valid \|\| authctxt->user == NULL)
	105	return (0);
	106
	107	mechs = packet_get_int();
	108	if (mechs == 0) {
	109	debug("Mechanism negotiation is not supported");
	110	return (0);
	111	}
	112
	113	ssh_gssapi_supported_oids(&supported);
	114	do {
	115	mechs--;
	116
	117	if (doid)
	118	xfree(doid);
	119
cdd66111	120	present = 0;
0fff78ff	121	doid = packet_get_string(&len);
0fff78ff	122
665a873d	123	if (len > 2 && doid[0] == SSH_GSS_OIDTYPE &&
665a873d	124	doid[1] == len - 2) {
c9f39d2c	125	goid.elements = doid + 2;
	126	goid.length = len - 2;
	127	gss_test_oid_set_member(&ms, &goid, supported,
cdd66111	128	&present);
	129	} else {
	130	logit("Badly formed OID received");
0fff78ff	131	}
0fff78ff	132	} while (mechs > 0 && !present);
	133
	134	gss_release_oid_set(&ms, &supported);
	135
	136	if (!present) {
	137	xfree(doid);
d617aef3	138	authctxt->server_caused_failure = 1;
0fff78ff	139	return (0);
	140	}
	141
c9f39d2c	142	if (GSS_ERROR(PRIVSEP(ssh_gssapi_server_ctx(&ctxt, &goid)))) {
9108f8d9	143	if (ctxt != NULL)
9108f8d9	144	ssh_gssapi_delete_ctx(&ctxt);
0fff78ff	145	xfree(doid);
d617aef3	146	authctxt->server_caused_failure = 1;
0fff78ff	147	return (0);
	148	}
	149
2c06c99b	150	authctxt->methoddata = (void *)ctxt;
0fff78ff	151
	152	packet_start(SSH2_MSG_USERAUTH_GSSAPI_RESPONSE);
	153
cdd66111	154	/* Return the OID that we received */
0fff78ff	155	packet_put_string(doid, len);
	156
	157	packet_send();
	158	xfree(doid);
	159
	160	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, &input_gssapi_token);
	161	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, &input_gssapi_errtok);
	162	authctxt->postponed = 1;
	163
	164	return (0);
	165	}
	166
	167	static void
	168	input_gssapi_token(int type, u_int32_t plen, void *ctxt)
	169	{
	170	Authctxt *authctxt = ctxt;
	171	Gssctxt *gssctxt;
	172	gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
	173	gss_buffer_desc recv_tok;
cdd66111	174	OM_uint32 maj_status, min_status, flags;
0fff78ff	175	u_int len;
	176
	177	if (authctxt == NULL \|\| (authctxt->methoddata == NULL && !use_privsep))
	178	fatal("No authentication or GSSAPI context");
	179
	180	gssctxt = authctxt->methoddata;
	181	recv_tok.value = packet_get_string(&len);
	182	recv_tok.length = len; /* u_int vs. size_t */
	183
	184	packet_check_eom();
	185
	186	maj_status = PRIVSEP(ssh_gssapi_accept_ctx(gssctxt, &recv_tok,
cdd66111	187	&send_tok, &flags));
0fff78ff	188
	189	xfree(recv_tok.value);
	190
	191	if (GSS_ERROR(maj_status)) {
	192	if (send_tok.length != 0) {
	193	packet_start(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK);
	194	packet_put_string(send_tok.value, send_tok.length);
	195	packet_send();
	196	}
	197	authctxt->postponed = 0;
	198	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, NULL);
cdd66111	199	userauth_finish(authctxt, 0, "gssapi-with-mic");
0fff78ff	200	} else {
	201	if (send_tok.length != 0) {
	202	packet_start(SSH2_MSG_USERAUTH_GSSAPI_TOKEN);
	203	packet_put_string(send_tok.value, send_tok.length);
	204	packet_send();
	205	}
	206	if (maj_status == GSS_S_COMPLETE) {
	207	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, NULL);
cdd66111	208	if (flags & GSS_C_INTEG_FLAG)
	209	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_MIC,
	210	&input_gssapi_mic);
	211	else
	212	dispatch_set(
	213	SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE,
	214	&input_gssapi_exchange_complete);
0fff78ff	215	}
	216	}
	217
	218	gss_release_buffer(&min_status, &send_tok);
	219	}
	220
	221	static void
	222	input_gssapi_errtok(int type, u_int32_t plen, void *ctxt)
	223	{
	224	Authctxt *authctxt = ctxt;
	225	Gssctxt *gssctxt;
	226	gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
	227	gss_buffer_desc recv_tok;
	228	OM_uint32 maj_status;
	229	u_int len;
	230
	231	if (authctxt == NULL \|\| (authctxt->methoddata == NULL && !use_privsep))
	232	fatal("No authentication or GSSAPI context");
	233
	234	gssctxt = authctxt->methoddata;
	235	recv_tok.value = packet_get_string(&len);
	236	recv_tok.length = len;
	237
	238	packet_check_eom();
	239
	240	/* Push the error token into GSSAPI to see what it says */
	241	maj_status = PRIVSEP(ssh_gssapi_accept_ctx(gssctxt, &recv_tok,
	242	&send_tok, NULL));
	243
	244	xfree(recv_tok.value);
	245
	246	/* We can't return anything to the client, even if we wanted to */
	247	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, NULL);
	248	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, NULL);
	249
	250	/* The client will have already moved on to the next auth */
	251
	252	gss_release_buffer(&maj_status, &send_tok);
	253	}
	254
	255	/*
	256	* This is called when the client thinks we've completed authentication.
	257	* It should only be enabled in the dispatch handler by the function above,
	258	* which only enables it once the GSSAPI exchange is complete.
	259	*/
	260
	261	static void
	262	input_gssapi_exchange_complete(int type, u_int32_t plen, void *ctxt)
	263	{
	264	Authctxt *authctxt = ctxt;
	265	Gssctxt *gssctxt;
	266	int authenticated;
	267
	268	if (authctxt == NULL \|\| (authctxt->methoddata == NULL && !use_privsep))
	269	fatal("No authentication or GSSAPI context");
	270
	271	gssctxt = authctxt->methoddata;
	272
	273	/*
cdd66111	274	* We don't need to check the status, because we're only enabled in
cdd66111	275	* the dispatcher once the exchange is complete
0fff78ff	276	*/
	277
	278	packet_check_eom();
	279
	280	authenticated = PRIVSEP(ssh_gssapi_userok(authctxt->user));
	281
	282	authctxt->postponed = 0;
	283	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, NULL);
	284	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, NULL);
cdd66111	285	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_MIC, NULL);
	286	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE, NULL);
	287	userauth_finish(authctxt, authenticated, "gssapi-with-mic");
	288	}
	289
	290	static void
	291	input_gssapi_mic(int type, u_int32_t plen, void *ctxt)
	292	{
	293	Authctxt *authctxt = ctxt;
	294	Gssctxt *gssctxt;
	295	int authenticated = 0;
	296	Buffer b;
	297	gss_buffer_desc mic, gssbuf;
	298	u_int len;
	299
	300	if (authctxt == NULL \|\| (authctxt->methoddata == NULL && !use_privsep))
	301	fatal("No authentication or GSSAPI context");
	302
	303	gssctxt = authctxt->methoddata;
	304
	305	mic.value = packet_get_string(&len);
	306	mic.length = len;
	307
	308	ssh_gssapi_buildmic(&b, authctxt->user, authctxt->service,
	309	"gssapi-with-mic");
	310
	311	gssbuf.value = buffer_ptr(&b);
	312	gssbuf.length = buffer_len(&b);
	313
	314	if (!GSS_ERROR(PRIVSEP(ssh_gssapi_checkmic(gssctxt, &gssbuf, &mic))))
	315	authenticated = PRIVSEP(ssh_gssapi_userok(authctxt->user));
	316	else
	317	logit("GSSAPI MIC check failed");
	318
	319	buffer_free(&b);
	320	xfree(mic.value);
	321
	322	authctxt->postponed = 0;
	323	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, NULL);
	324	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, NULL);
	325	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_MIC, NULL);
0fff78ff	326	dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE, NULL);
cdd66111	327	userauth_finish(authctxt, authenticated, "gssapi-with-mic");
0fff78ff	328	}
0fff78ff	329
d617aef3	330	Authmethod method_gsskeyex = {
	331	"gssapi-keyex",
	332	userauth_gsskeyex,
	333	&options.gss_authentication
	334	};
	335
0fff78ff	336	Authmethod method_gssapi = {
cdd66111	337	"gssapi-with-mic",
0fff78ff	338	userauth_gssapi,
	339	&options.gss_authentication
	340	};
	341
	342	#endif /* GSSAPI */