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

/*
 * Copyright (c) 2001-2009 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 <string.h>

#include <openssl/crypto.h>
#include <openssl/bn.h>

#include "xmalloc.h"
#include "buffer.h"
#include "ssh2.h"
#include "key.h"
#include "cipher.h"
#include "kex.h"
#include "log.h"
#include "packet.h"
#include "dh.h"
#include "ssh-gss.h"
#include "monitor_wrap.h"
#include "servconf.h"

static void kex_gss_send_error(Gssctxt *ctxt);
extern ServerOptions options;

void
kexgss_server(Kex *kex)
{
	OM_uint32 maj_status, min_status;
	
	/* 
	 * Some GSSAPI implementations use the input value of ret_flags (an
 	 * output variable) as a means of triggering mechanism specific 
 	 * features. Initializing it to zero avoids inadvertently 
 	 * activating this non-standard behaviour.
	 */

	OM_uint32 ret_flags = 0;
	gss_buffer_desc gssbuf, recv_tok, msg_tok;
	gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
	Gssctxt *ctxt = NULL;
	u_int slen, klen, kout, hashlen;
	u_char *kbuf, *hash;
	DH *dh;
	int min = -1, max = -1, nbits = -1;
	BIGNUM *shared_secret = NULL;
	BIGNUM *dh_client_pub = NULL;
	int type = 0;
	gss_OID oid;
	char *mechs;

	/* Initialise GSSAPI */

	/* If we're rekeying, privsep means that some of the private structures
	 * in the GSSAPI code are no longer available. This kludges them back
	 * into life
	 */
	if (!ssh_gssapi_oid_table_ok()) 
		if ((mechs = ssh_gssapi_server_mechanisms()))
			xfree(mechs);

	debug2("%s: Identifying %s", __func__, kex->name);
	oid = ssh_gssapi_id_kex(NULL, kex->name, kex->kex_type);
	if (oid == GSS_C_NO_OID)
	   fatal("Unknown gssapi mechanism");

	debug2("%s: Acquiring credentials", __func__);

	if (GSS_ERROR(PRIVSEP(ssh_gssapi_server_ctx(&ctxt, oid)))) {
		kex_gss_send_error(ctxt);
		fatal("Unable to acquire credentials for the server");
    }

	switch (kex->kex_type) {
	case KEX_GSS_GRP1_SHA1:
		dh = dh_new_group1();
		break;
	case KEX_GSS_GRP14_SHA1:
		dh = dh_new_group14();
		break;
	case KEX_GSS_GEX_SHA1:
		debug("Doing group exchange");
		packet_read_expect(SSH2_MSG_KEXGSS_GROUPREQ);
		min = packet_get_int();
		nbits = packet_get_int();
		max = packet_get_int();
		min = MAX(DH_GRP_MIN, min);
		max = MIN(DH_GRP_MAX, max);
		packet_check_eom();
		if (max < min || nbits < min || max < nbits)
			fatal("GSS_GEX, bad parameters: %d !< %d !< %d",
			    min, nbits, max);
		dh = PRIVSEP(choose_dh(min, nbits, max));
		if (dh == NULL)
			packet_disconnect("Protocol error: no matching group found");

		packet_start(SSH2_MSG_KEXGSS_GROUP);
		packet_put_bignum2(dh->p);
		packet_put_bignum2(dh->g);
		packet_send();

		packet_write_wait();
		break;
	default:
		fatal("%s: Unexpected KEX type %d", __func__, kex->kex_type);
	}

	dh_gen_key(dh, kex->we_need * 8);

	do {
		debug("Wait SSH2_MSG_GSSAPI_INIT");
		type = packet_read();
		switch(type) {
		case SSH2_MSG_KEXGSS_INIT:
			if (dh_client_pub != NULL) 
				fatal("Received KEXGSS_INIT after initialising");
			recv_tok.value = packet_get_string(&slen);
			recv_tok.length = slen; 

			if ((dh_client_pub = BN_new()) == NULL)
				fatal("dh_client_pub == NULL");

			packet_get_bignum2(dh_client_pub);

			/* Send SSH_MSG_KEXGSS_HOSTKEY here, if we want */
			break;
		case SSH2_MSG_KEXGSS_CONTINUE:
			recv_tok.value = packet_get_string(&slen);
			recv_tok.length = slen; 
			break;
		default:
			packet_disconnect(
			    "Protocol error: didn't expect packet type %d",
			    type);
		}

		maj_status = PRIVSEP(ssh_gssapi_accept_ctx(ctxt, &recv_tok, 
		    &send_tok, &ret_flags));

		xfree(recv_tok.value);

		if (maj_status != GSS_S_COMPLETE && send_tok.length == 0)
			fatal("Zero length token output when incomplete");

		if (dh_client_pub == NULL)
			fatal("No client public key");
		
		if (maj_status & GSS_S_CONTINUE_NEEDED) {
			debug("Sending GSSAPI_CONTINUE");
			packet_start(SSH2_MSG_KEXGSS_CONTINUE);
			packet_put_string((char *)send_tok.value, send_tok.length);
			packet_send();
			gss_release_buffer(&min_status, &send_tok);
		}
	} while (maj_status & GSS_S_CONTINUE_NEEDED);

	if (GSS_ERROR(maj_status)) {
		kex_gss_send_error(ctxt);
		if (send_tok.length > 0) {
			packet_start(SSH2_MSG_KEXGSS_CONTINUE);
			packet_put_string((char *)send_tok.value, send_tok.length);
			packet_send();
		}
		packet_disconnect("GSSAPI Key Exchange handshake failed");
	}

	if (!(ret_flags & GSS_C_MUTUAL_FLAG))
		fatal("Mutual Authentication flag wasn't set");

	if (!(ret_flags & GSS_C_INTEG_FLAG))
		fatal("Integrity flag wasn't set");
	
	if (!dh_pub_is_valid(dh, dh_client_pub))
		packet_disconnect("bad client public DH value");

	klen = DH_size(dh);
	kbuf = xmalloc(klen); 
	kout = DH_compute_key(kbuf, dh_client_pub, dh);
	if (kout < 0)
		fatal("DH_compute_key: failed");

	shared_secret = BN_new();
	if (shared_secret == NULL)
		fatal("kexgss_server: BN_new failed");

	if (BN_bin2bn(kbuf, kout, shared_secret) == NULL)
		fatal("kexgss_server: BN_bin2bn failed");

	memset(kbuf, 0, klen);
	xfree(kbuf);

	switch (kex->kex_type) {
	case KEX_GSS_GRP1_SHA1:
	case KEX_GSS_GRP14_SHA1:
		kex_dh_hash(
		    kex->client_version_string, kex->server_version_string,
		    buffer_ptr(&kex->peer), buffer_len(&kex->peer),
		    buffer_ptr(&kex->my), buffer_len(&kex->my),
		    NULL, 0, /* Change this if we start sending host keys */
		    dh_client_pub, dh->pub_key, shared_secret,
		    &hash, &hashlen
		);
		break;
	case KEX_GSS_GEX_SHA1:
		kexgex_hash(
		    kex->evp_md,
		    kex->client_version_string, kex->server_version_string,
		    buffer_ptr(&kex->peer), buffer_len(&kex->peer),
		    buffer_ptr(&kex->my), buffer_len(&kex->my),
		    NULL, 0,
		    min, nbits, max,
		    dh->p, dh->g,
		    dh_client_pub,
		    dh->pub_key,
		    shared_secret,
		    &hash, &hashlen
		);
		break;
	default:
		fatal("%s: Unexpected KEX type %d", __func__, kex->kex_type);
	}

	BN_clear_free(dh_client_pub);

	if (kex->session_id == NULL) {
		kex->session_id_len = hashlen;
		kex->session_id = xmalloc(kex->session_id_len);
		memcpy(kex->session_id, hash, kex->session_id_len);
	}

	gssbuf.value = hash;
	gssbuf.length = hashlen;

	if (GSS_ERROR(PRIVSEP(ssh_gssapi_sign(ctxt,&gssbuf,&msg_tok))))
		fatal("Couldn't get MIC");

	packet_start(SSH2_MSG_KEXGSS_COMPLETE);
	packet_put_bignum2(dh->pub_key);
	packet_put_string((char *)msg_tok.value,msg_tok.length);

	if (send_tok.length != 0) {
		packet_put_char(1); /* true */
		packet_put_string((char *)send_tok.value, send_tok.length);
	} else {
		packet_put_char(0); /* false */
	}
	packet_send();

	gss_release_buffer(&min_status, &send_tok);
	gss_release_buffer(&min_status, &msg_tok);

	if (gss_kex_context == NULL)
		gss_kex_context = ctxt;
	else 
		ssh_gssapi_delete_ctx(&ctxt);

	DH_free(dh);

	kex_derive_keys(kex, hash, hashlen, shared_secret);
	BN_clear_free(shared_secret);
	kex_finish(kex);

	/* If this was a rekey, then save out any delegated credentials we
	 * just exchanged.  */
	if (options.gss_store_rekey)
		ssh_gssapi_rekey_creds();
}

static void 
kex_gss_send_error(Gssctxt *ctxt) {
	char *errstr;
	OM_uint32 maj,min;
		
	errstr=PRIVSEP(ssh_gssapi_last_error(ctxt,&maj,&min));
	if (errstr) {
		packet_start(SSH2_MSG_KEXGSS_ERROR);
		packet_put_int(maj);
		packet_put_int(min);
		packet_put_cstring(errstr);
		packet_put_cstring("");
		packet_send();
		packet_write_wait();
		/* XXX - We should probably log the error locally here */
		xfree(errstr);
	}
}
#endif /* GSSAPI */
Commit	Line	Data
b46fa825	1	/*
f97edba6	2	* Copyright (c) 2001-2009 Simon Wilkinson. All rights reserved.
b46fa825	3	*
	4	* Redistribution and use in source and binary forms, with or without
	5	* modification, are permitted provided that the following conditions
	6	* are met:
	7	* 1. Redistributions of source code must retain the above copyright
	8	* notice, this list of conditions and the following disclaimer.
	9	* 2. Redistributions in binary form must reproduce the above copyright
	10	* notice, this list of conditions and the following disclaimer in the
	11	* documentation and/or other materials provided with the distribution.
	12	*
	13	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR
	14	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	15	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	16	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	17	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	18	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	19	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	20	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	21	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	22	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	23	*/
	24
	25	#include "includes.h"
	26
	27	#ifdef GSSAPI
	28
f713db99	29	#include <string.h>
f713db99	30
b46fa825	31	#include <openssl/crypto.h>
	32	#include <openssl/bn.h>
	33
	34	#include "xmalloc.h"
	35	#include "buffer.h"
f713db99	36	#include "ssh2.h"
30460aeb	37	#include "key.h"
f713db99	38	#include "cipher.h"
b46fa825	39	#include "kex.h"
	40	#include "log.h"
	41	#include "packet.h"
	42	#include "dh.h"
b46fa825	43	#include "ssh-gss.h"
b46fa825	44	#include "monitor_wrap.h"
f97edba6	45	#include "servconf.h"
23987cb8	46
23987cb8	47	static void kex_gss_send_error(Gssctxt *ctxt);
f97edba6	48	extern ServerOptions options;
b46fa825	49
	50	void
	51	kexgss_server(Kex *kex)
	52	{
b46fa825	53	OM_uint32 maj_status, min_status;
b46fa825	54
fe4ad273	55	/*
fe4ad273	56	* Some GSSAPI implementations use the input value of ret_flags (an
e23e524c	57	* output variable) as a means of triggering mechanism specific
e23e524c	58	* features. Initializing it to zero avoids inadvertently
fe4ad273	59	* activating this non-standard behaviour.
fe4ad273	60	*/
b46fa825	61
b46fa825	62	OM_uint32 ret_flags = 0;
fe4ad273	63	gss_buffer_desc gssbuf, recv_tok, msg_tok;
fe4ad273	64	gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
b46fa825	65	Gssctxt *ctxt = NULL;
f472818d	66	u_int slen, klen, kout, hashlen;
f472818d	67	u_char kbuf, hash;
fe4ad273	68	DH *dh;
	69	int min = -1, max = -1, nbits = -1;
	70	BIGNUM *shared_secret = NULL;
	71	BIGNUM *dh_client_pub = NULL;
	72	int type = 0;
23987cb8	73	gss_OID oid;
f97edba6	74	char *mechs;
f713db99	75
b46fa825	76	/* Initialise GSSAPI */
b46fa825	77
fe4ad273	78	/* If we're rekeying, privsep means that some of the private structures
fe4ad273	79	* in the GSSAPI code are no longer available. This kludges them back
f713db99	80	* into life
fe4ad273	81	*/
fe4ad273	82	if (!ssh_gssapi_oid_table_ok())
f97edba6	83	if ((mechs = ssh_gssapi_server_mechanisms()))
f97edba6	84	xfree(mechs);
fe4ad273	85
fe4ad273	86	debug2("%s: Identifying %s", __func__, kex->name);
f713db99	87	oid = ssh_gssapi_id_kex(NULL, kex->name, kex->kex_type);
f713db99	88	if (oid == GSS_C_NO_OID)
fe4ad273	89	fatal("Unknown gssapi mechanism");
	90
	91	debug2("%s: Acquiring credentials", __func__);
	92
	93	if (GSS_ERROR(PRIVSEP(ssh_gssapi_server_ctx(&ctxt, oid)))) {
23987cb8	94	kex_gss_send_error(ctxt);
f713db99	95	fatal("Unable to acquire credentials for the server");
	96	}
	97
	98	switch (kex->kex_type) {
	99	case KEX_GSS_GRP1_SHA1:
	100	dh = dh_new_group1();
	101	break;
	102	case KEX_GSS_GRP14_SHA1:
	103	dh = dh_new_group14();
	104	break;
	105	case KEX_GSS_GEX_SHA1:
fe4ad273	106	debug("Doing group exchange");
	107	packet_read_expect(SSH2_MSG_KEXGSS_GROUPREQ);
	108	min = packet_get_int();
	109	nbits = packet_get_int();
	110	max = packet_get_int();
	111	min = MAX(DH_GRP_MIN, min);
	112	max = MIN(DH_GRP_MAX, max);
	113	packet_check_eom();
	114	if (max < min \|\| nbits < min \|\| max < nbits)
	115	fatal("GSS_GEX, bad parameters: %d !< %d !< %d",
	116	min, nbits, max);
	117	dh = PRIVSEP(choose_dh(min, nbits, max));
	118	if (dh == NULL)
	119	packet_disconnect("Protocol error: no matching group found");
	120
	121	packet_start(SSH2_MSG_KEXGSS_GROUP);
	122	packet_put_bignum2(dh->p);
	123	packet_put_bignum2(dh->g);
	124	packet_send();
	125
	126	packet_write_wait();
f713db99	127	break;
	128	default:
	129	fatal("%s: Unexpected KEX type %d", __func__, kex->kex_type);
fe4ad273	130	}
f713db99	131
fe4ad273	132	dh_gen_key(dh, kex->we_need * 8);
fe4ad273	133
b46fa825	134	do {
	135	debug("Wait SSH2_MSG_GSSAPI_INIT");
	136	type = packet_read();
	137	switch(type) {
	138	case SSH2_MSG_KEXGSS_INIT:
fe4ad273	139	if (dh_client_pub != NULL)
	140	fatal("Received KEXGSS_INIT after initialising");
	141	recv_tok.value = packet_get_string(&slen);
	142	recv_tok.length = slen;
	143
	144	if ((dh_client_pub = BN_new()) == NULL)
	145	fatal("dh_client_pub == NULL");
	146
	147	packet_get_bignum2(dh_client_pub);
	148
	149	/* Send SSH_MSG_KEXGSS_HOSTKEY here, if we want */
b46fa825	150	break;
b46fa825	151	case SSH2_MSG_KEXGSS_CONTINUE:
fe4ad273	152	recv_tok.value = packet_get_string(&slen);
fe4ad273	153	recv_tok.length = slen;
b46fa825	154	break;
b46fa825	155	default:
fe4ad273	156	packet_disconnect(
	157	"Protocol error: didn't expect packet type %d",
	158	type);
b46fa825	159	}
b46fa825	160
fe4ad273	161	maj_status = PRIVSEP(ssh_gssapi_accept_ctx(ctxt, &recv_tok,
	162	&send_tok, &ret_flags));
	163
	164	xfree(recv_tok.value);
	165
	166	if (maj_status != GSS_S_COMPLETE && send_tok.length == 0)
	167	fatal("Zero length token output when incomplete");
	168
e23e524c	169	if (dh_client_pub == NULL)
	170	fatal("No client public key");
	171
c045675e	172	if (maj_status & GSS_S_CONTINUE_NEEDED) {
b46fa825	173	debug("Sending GSSAPI_CONTINUE");
b46fa825	174	packet_start(SSH2_MSG_KEXGSS_CONTINUE);
c7931c9a	175	packet_put_string((char *)send_tok.value, send_tok.length);
b46fa825	176	packet_send();
b46fa825	177	gss_release_buffer(&min_status, &send_tok);
	178	}
	179	} while (maj_status & GSS_S_CONTINUE_NEEDED);
	180
	181	if (GSS_ERROR(maj_status)) {
23987cb8	182	kex_gss_send_error(ctxt);
fe4ad273	183	if (send_tok.length > 0) {
e23e524c	184	packet_start(SSH2_MSG_KEXGSS_CONTINUE);
c7931c9a	185	packet_put_string((char *)send_tok.value, send_tok.length);
e23e524c	186	packet_send();
fe4ad273	187	}
fe4ad273	188	packet_disconnect("GSSAPI Key Exchange handshake failed");
b46fa825	189	}
fe4ad273	190
23987cb8	191	if (!(ret_flags & GSS_C_MUTUAL_FLAG))
fe4ad273	192	fatal("Mutual Authentication flag wasn't set");
fe4ad273	193
23987cb8	194	if (!(ret_flags & GSS_C_INTEG_FLAG))
fe4ad273	195	fatal("Integrity flag wasn't set");
b46fa825	196
fe4ad273	197	if (!dh_pub_is_valid(dh, dh_client_pub))
fe4ad273	198	packet_disconnect("bad client public DH value");
b46fa825	199
fe4ad273	200	klen = DH_size(dh);
	201	kbuf = xmalloc(klen);
	202	kout = DH_compute_key(kbuf, dh_client_pub, dh);
f97edba6	203	if (kout < 0)
f97edba6	204	fatal("DH_compute_key: failed");
b46fa825	205
b46fa825	206	shared_secret = BN_new();
f97edba6	207	if (shared_secret == NULL)
	208	fatal("kexgss_server: BN_new failed");
	209
	210	if (BN_bin2bn(kbuf, kout, shared_secret) == NULL)
	211	fatal("kexgss_server: BN_bin2bn failed");
	212
b46fa825	213	memset(kbuf, 0, klen);
b46fa825	214	xfree(kbuf);
fe4ad273	215
f713db99	216	switch (kex->kex_type) {
	217	case KEX_GSS_GRP1_SHA1:
	218	case KEX_GSS_GRP14_SHA1:
	219	kex_dh_hash(
	220	kex->client_version_string, kex->server_version_string,
	221	buffer_ptr(&kex->peer), buffer_len(&kex->peer),
	222	buffer_ptr(&kex->my), buffer_len(&kex->my),
	223	NULL, 0, /* Change this if we start sending host keys */
	224	dh_client_pub, dh->pub_key, shared_secret,
	225	&hash, &hashlen
	226	);
	227	break;
	228	case KEX_GSS_GEX_SHA1:
08822d99	229	kexgex_hash(
08822d99	230	kex->evp_md,
fe4ad273	231	kex->client_version_string, kex->server_version_string,
	232	buffer_ptr(&kex->peer), buffer_len(&kex->peer),
	233	buffer_ptr(&kex->my), buffer_len(&kex->my),
	234	NULL, 0,
	235	min, nbits, max,
	236	dh->p, dh->g,
	237	dh_client_pub,
	238	dh->pub_key,
08822d99	239	shared_secret,
08822d99	240	&hash, &hashlen
fe4ad273	241	);
f713db99	242	break;
	243	default:
	244	fatal("%s: Unexpected KEX type %d", __func__, kex->kex_type);
fe4ad273	245	}
f713db99	246
f97edba6	247	BN_clear_free(dh_client_pub);
fe4ad273	248
b46fa825	249	if (kex->session_id == NULL) {
d33fd7cd	250	kex->session_id_len = hashlen;
b46fa825	251	kex->session_id = xmalloc(kex->session_id_len);
	252	memcpy(kex->session_id, hash, kex->session_id_len);
	253	}
fe4ad273	254
b46fa825	255	gssbuf.value = hash;
d33fd7cd	256	gssbuf.length = hashlen;
fe4ad273	257
fe4ad273	258	if (GSS_ERROR(PRIVSEP(ssh_gssapi_sign(ctxt,&gssbuf,&msg_tok))))
23987cb8	259	fatal("Couldn't get MIC");
fe4ad273	260
b46fa825	261	packet_start(SSH2_MSG_KEXGSS_COMPLETE);
	262	packet_put_bignum2(dh->pub_key);
	263	packet_put_string((char *)msg_tok.value,msg_tok.length);
	264
fe4ad273	265	if (send_tok.length != 0) {
b46fa825	266	packet_put_char(1); /* true */
fe4ad273	267	packet_put_string((char *)send_tok.value, send_tok.length);
b46fa825	268	} else {
	269	packet_put_char(0); /* false */
	270	}
fe4ad273	271	packet_send();
	272
	273	gss_release_buffer(&min_status, &send_tok);
	274	gss_release_buffer(&min_status, &msg_tok);
	275
	276	if (gss_kex_context == NULL)
	277	gss_kex_context = ctxt;
	278	else
	279	ssh_gssapi_delete_ctx(&ctxt);
	280
b46fa825	281	DH_free(dh);
b46fa825	282
08822d99	283	kex_derive_keys(kex, hash, hashlen, shared_secret);
b46fa825	284	BN_clear_free(shared_secret);
b46fa825	285	kex_finish(kex);
f97edba6	286
	287	/* If this was a rekey, then save out any delegated credentials we
	288	* just exchanged. */
	289	if (options.gss_store_rekey)
	290	ssh_gssapi_rekey_creds();
b46fa825	291	}
b46fa825	292
23987cb8	293	static void
	294	kex_gss_send_error(Gssctxt *ctxt) {
	295	char *errstr;
	296	OM_uint32 maj,min;
	297
	298	errstr=PRIVSEP(ssh_gssapi_last_error(ctxt,&maj,&min));
	299	if (errstr) {
	300	packet_start(SSH2_MSG_KEXGSS_ERROR);
	301	packet_put_int(maj);
	302	packet_put_int(min);
	303	packet_put_cstring(errstr);
	304	packet_put_cstring("");
	305	packet_send();
	306	packet_write_wait();
	307	/* XXX - We should probably log the error locally here */
	308	xfree(errstr);
	309	}
	310	}
b46fa825	311	#endif /* GSSAPI */