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

/* $OpenBSD: gss-serv.c,v 1.20 2006/08/03 03:34:42 deraadt Exp $ */

/*
 * Copyright (c) 2001-2006 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 <string.h>
#include <unistd.h>

#include "xmalloc.h"
#include "buffer.h"
#include "key.h"
#include "hostfile.h"
#include "auth.h"
#include "log.h"
#include "channels.h"
#include "session.h"
#include "misc.h"
#include "servconf.h"

#include "ssh-gss.h"
#include "monitor_wrap.h"

extern ServerOptions options;

static ssh_gssapi_client gssapi_client =
    { GSS_C_EMPTY_BUFFER, GSS_C_EMPTY_BUFFER,
    GSS_C_NO_CREDENTIAL, NULL, {NULL, NULL, NULL}};

ssh_gssapi_mech gssapi_null_mech =
    { NULL, NULL, {0, NULL}, NULL, NULL, NULL, NULL};

#ifdef KRB5
extern ssh_gssapi_mech gssapi_kerberos_mech;
#endif

ssh_gssapi_mech* supported_mechs[]= {
#ifdef KRB5
	&gssapi_kerberos_mech,
#endif
	&gssapi_null_mech,
};

/* Unprivileged */
char *
ssh_gssapi_server_mechanisms() {
	gss_OID_set	supported;

	ssh_gssapi_supported_oids(&supported);
	return (ssh_gssapi_kex_mechs(supported, &ssh_gssapi_server_check_mech,
	    NULL));
}

/* Unprivileged */
int
ssh_gssapi_server_check_mech(Gssctxt **dum, gss_OID oid, const char *data) {
	Gssctxt *ctx = NULL;
	int res;
 
	res = !GSS_ERROR(PRIVSEP(ssh_gssapi_server_ctx(&ctx, oid)));
	ssh_gssapi_delete_ctx(&ctx);

	return (res);
}

/* Unprivileged */
void
ssh_gssapi_supported_oids(gss_OID_set *oidset)
{
	int i = 0;
	OM_uint32 min_status;
	int present;
	gss_OID_set supported;

	gss_create_empty_oid_set(&min_status, oidset);
	gss_indicate_mechs(&min_status, &supported);

	while (supported_mechs[i]->name != NULL) {
		if (GSS_ERROR(gss_test_oid_set_member(&min_status,
		    &supported_mechs[i]->oid, supported, &present)))
			present = 0;
		if (present)
			gss_add_oid_set_member(&min_status,
			    &supported_mechs[i]->oid, oidset);
		i++;
	}

	gss_release_oid_set(&min_status, &supported);
}

OM_uint32
ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID oid)
{
	if (*ctx)
		ssh_gssapi_delete_ctx(ctx);
	ssh_gssapi_build_ctx(ctx);
	ssh_gssapi_set_oid(*ctx, oid);
	return (ssh_gssapi_acquire_cred(*ctx));
}

/* Acquire credentials for a server running on the current host.
 * Requires that the context structure contains a valid OID
 */

/* Returns a GSSAPI error code */
OM_uint32
ssh_gssapi_acquire_cred(Gssctxt *ctx)
{
	OM_uint32 status;
	char lname[MAXHOSTNAMELEN];
	gss_OID_set oidset;

	if (options.gss_strict_acceptor) {
		gss_create_empty_oid_set(&status, &oidset);
		gss_add_oid_set_member(&status, ctx->oid, &oidset);

		if (gethostname(lname, MAXHOSTNAMELEN)) {
			gss_release_oid_set(&status, &oidset);
			return (-1);
		}

		if (GSS_ERROR(ssh_gssapi_import_name(ctx, lname))) {
			gss_release_oid_set(&status, &oidset);
			return (ctx->major);
		}

		if ((ctx->major = gss_acquire_cred(&ctx->minor,
		    ctx->name, 0, oidset, GSS_C_ACCEPT, &ctx->creds, 
		    NULL, NULL)))
			ssh_gssapi_error(ctx);

		gss_release_oid_set(&status, &oidset);
		return (ctx->major);
	} else {
		ctx->name = GSS_C_NO_NAME;
		ctx->creds = GSS_C_NO_CREDENTIAL;
	}
	return GSS_S_COMPLETE;
}


/* Wrapper around accept_sec_context
 * Requires that the context contains:
 *    oid
 *    credentials	(from ssh_gssapi_acquire_cred)
 */
/* Privileged */
OM_uint32
ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *recv_tok,
    gss_buffer_desc *send_tok, OM_uint32 *flags)
{
	OM_uint32 status;
	gss_OID mech;

	ctx->major = gss_accept_sec_context(&ctx->minor,
	    &ctx->context, ctx->creds, recv_tok,
	    GSS_C_NO_CHANNEL_BINDINGS, &ctx->client, &mech,
	    send_tok, flags, NULL, &ctx->client_creds);

	if (GSS_ERROR(ctx->major))
		ssh_gssapi_error(ctx);

	if (ctx->client_creds)
		debug("Received some client credentials");
	else
		debug("Got no client credentials");

	status = ctx->major;

	/* Now, if we're complete and we have the right flags, then
	 * we flag the user as also having been authenticated
	 */

	if (((flags == NULL) || ((*flags & GSS_C_MUTUAL_FLAG) &&
	    (*flags & GSS_C_INTEG_FLAG))) && (ctx->major == GSS_S_COMPLETE)) {
		if (ssh_gssapi_getclient(ctx, &gssapi_client))
			fatal("Couldn't convert client name");
	}

	return (status);
}

/*
 * This parses an exported name, extracting the mechanism specific portion
 * to use for ACL checking. It verifies that the name belongs the mechanism
 * originally selected.
 */
static OM_uint32
ssh_gssapi_parse_ename(Gssctxt *ctx, gss_buffer_t ename, gss_buffer_t name)
{
	u_char *tok;
	OM_uint32 offset;
	OM_uint32 oidl;

	tok = ename->value;

	/*
	 * Check that ename is long enough for all of the fixed length
	 * header, and that the initial ID bytes are correct
	 */

	if (ename->length < 6 || memcmp(tok, "\x04\x01", 2) != 0)
		return GSS_S_FAILURE;

	/*
	 * Extract the OID, and check it. Here GSSAPI breaks with tradition
	 * and does use the OID type and length bytes. To confuse things
	 * there are two lengths - the first including these, and the
	 * second without.
	 */

	oidl = get_u16(tok+2); /* length including next two bytes */
	oidl = oidl-2; /* turn it into the _real_ length of the variable OID */

	/*
	 * Check the BER encoding for correct type and length, that the
	 * string is long enough and that the OID matches that in our context
	 */
	if (tok[4] != 0x06 || tok[5] != oidl ||
	    ename->length < oidl+6 ||
	    !ssh_gssapi_check_oid(ctx, tok+6, oidl))
		return GSS_S_FAILURE;

	offset = oidl+6;

	if (ename->length < offset+4)
		return GSS_S_FAILURE;

	name->length = get_u32(tok+offset);
	offset += 4;

	if (ename->length < offset+name->length)
		return GSS_S_FAILURE;

	name->value = xmalloc(name->length+1);
	memcpy(name->value, tok+offset, name->length);
	((char *)name->value)[name->length] = 0;

	return GSS_S_COMPLETE;
}

/* Extract the client details from a given context. This can only reliably
 * be called once for a context */

/* Privileged (called from accept_secure_ctx) */
OM_uint32
ssh_gssapi_getclient(Gssctxt *ctx, ssh_gssapi_client *client)
{
	int i = 0;

	gss_buffer_desc ename;

	client->mech = NULL;

	while (supported_mechs[i]->name != NULL) {
		if (supported_mechs[i]->oid.length == ctx->oid->length &&
		    (memcmp(supported_mechs[i]->oid.elements,
		    ctx->oid->elements, ctx->oid->length) == 0))
			client->mech = supported_mechs[i];
		i++;
	}

	if (client->mech == NULL)
		return GSS_S_FAILURE;

	if ((ctx->major = gss_display_name(&ctx->minor, ctx->client,
	    &client->displayname, NULL))) {
		ssh_gssapi_error(ctx);
		return (ctx->major);
	}

	if ((ctx->major = gss_export_name(&ctx->minor, ctx->client,
	    &ename))) {
		ssh_gssapi_error(ctx);
		return (ctx->major);
	}

	if ((ctx->major = ssh_gssapi_parse_ename(ctx,&ename,
	    &client->exportedname))) {
		return (ctx->major);
	}

	/* We can't copy this structure, so we just move the pointer to it */
	client->creds = ctx->client_creds;
	ctx->client_creds = GSS_C_NO_CREDENTIAL;
	return (ctx->major);
}

/* As user - called on fatal/exit */
void
ssh_gssapi_cleanup_creds(void)
{
	if (gssapi_client.store.filename != NULL) {
		/* Unlink probably isn't sufficient */
		debug("removing gssapi cred file\"%s\"",
		    gssapi_client.store.filename);
		unlink(gssapi_client.store.filename);
	}
}

/* As user */
void
ssh_gssapi_storecreds(void)
{
	if (gssapi_client.mech && gssapi_client.mech->storecreds) {
		(*gssapi_client.mech->storecreds)(&gssapi_client);
	} else
		debug("ssh_gssapi_storecreds: Not a GSSAPI mechanism");
}

/* This allows GSSAPI methods to do things to the childs environment based
 * on the passed authentication process and credentials.
 */
/* As user */
void
ssh_gssapi_do_child(char ***envp, u_int *envsizep)
{

	if (gssapi_client.store.envvar != NULL &&
	    gssapi_client.store.envval != NULL) {
		debug("Setting %s to %s", gssapi_client.store.envvar,
		    gssapi_client.store.envval);
		child_set_env(envp, envsizep, gssapi_client.store.envvar,
		    gssapi_client.store.envval);
	}
}

/* Privileged */
int
ssh_gssapi_userok(char *user)
{
	OM_uint32 lmin;

	if (gssapi_client.exportedname.length == 0 ||
	    gssapi_client.exportedname.value == NULL) {
		debug("No suitable client data");
		return 0;
	}
	if (gssapi_client.mech && gssapi_client.mech->userok)
		if ((*gssapi_client.mech->userok)(&gssapi_client, user))
			return 1;
		else {
			/* Destroy delegated credentials if userok fails */
			gss_release_buffer(&lmin, &gssapi_client.displayname);
			gss_release_buffer(&lmin, &gssapi_client.exportedname);
			gss_release_cred(&lmin, &gssapi_client.creds);
			memset(&gssapi_client, 0, sizeof(ssh_gssapi_client));
			return 0;
		}
	else
		debug("ssh_gssapi_userok: Unknown GSSAPI mechanism");
	return (0);
}

#endif
Commit	Line	Data
9108f8d9	1	/* $OpenBSD: gss-serv.c,v 1.20 2006/08/03 03:34:42 deraadt Exp $ */
0fff78ff	2
0fff78ff	3	/*
d617aef3	4	* Copyright (c) 2001-2006 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	#include <string.h>
	35	#include <unistd.h>
	36
	37	#include "xmalloc.h"
	38	#include "buffer.h"
	39	#include "key.h"
	40	#include "hostfile.h"
0fff78ff	41	#include "auth.h"
	42	#include "log.h"
	43	#include "channels.h"
	44	#include "session.h"
9108f8d9	45	#include "misc.h"
d617aef3	46	#include "servconf.h"
0fff78ff	47
0fff78ff	48	#include "ssh-gss.h"
d617aef3	49	#include "monitor_wrap.h"
	50
	51	extern ServerOptions options;
0fff78ff	52
0fff78ff	53	static ssh_gssapi_client gssapi_client =
	54	{ GSS_C_EMPTY_BUFFER, GSS_C_EMPTY_BUFFER,
	55	GSS_C_NO_CREDENTIAL, NULL, {NULL, NULL, NULL}};
	56
	57	ssh_gssapi_mech gssapi_null_mech =
	58	{ NULL, NULL, {0, NULL}, NULL, NULL, NULL, NULL};
	59
	60	#ifdef KRB5
	61	extern ssh_gssapi_mech gssapi_kerberos_mech;
	62	#endif
	63
	64	ssh_gssapi_mech* supported_mechs[]= {
	65	#ifdef KRB5
	66	&gssapi_kerberos_mech,
	67	#endif
	68	&gssapi_null_mech,
	69	};
	70
d617aef3	71	/* Unprivileged */
	72	char *
	73	ssh_gssapi_server_mechanisms() {
	74	gss_OID_set supported;
	75
	76	ssh_gssapi_supported_oids(&supported);
	77	return (ssh_gssapi_kex_mechs(supported, &ssh_gssapi_server_check_mech,
	78	NULL));
	79	}
	80
	81	/* Unprivileged */
	82	int
	83	ssh_gssapi_server_check_mech(Gssctxt *dum, gss_OID oid, const char data) {
	84	Gssctxt *ctx = NULL;
	85	int res;
	86
	87	res = !GSS_ERROR(PRIVSEP(ssh_gssapi_server_ctx(&ctx, oid)));
	88	ssh_gssapi_delete_ctx(&ctx);
	89
	90	return (res);
	91	}
	92
2c06c99b	93	/* Unprivileged */
0fff78ff	94	void
	95	ssh_gssapi_supported_oids(gss_OID_set *oidset)
	96	{
	97	int i = 0;
	98	OM_uint32 min_status;
	99	int present;
	100	gss_OID_set supported;
	101
	102	gss_create_empty_oid_set(&min_status, oidset);
	103	gss_indicate_mechs(&min_status, &supported);
	104
	105	while (supported_mechs[i]->name != NULL) {
	106	if (GSS_ERROR(gss_test_oid_set_member(&min_status,
	107	&supported_mechs[i]->oid, supported, &present)))
	108	present = 0;
	109	if (present)
	110	gss_add_oid_set_member(&min_status,
	111	&supported_mechs[i]->oid, oidset);
	112	i++;
	113	}
9108f8d9	114
9108f8d9	115	gss_release_oid_set(&min_status, &supported);
0fff78ff	116	}
0fff78ff	117
d617aef3	118	OM_uint32
	119	ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID oid)
	120	{
	121	if (*ctx)
	122	ssh_gssapi_delete_ctx(ctx);
	123	ssh_gssapi_build_ctx(ctx);
	124	ssh_gssapi_set_oid(*ctx, oid);
	125	return (ssh_gssapi_acquire_cred(*ctx));
	126	}
	127
	128	/* Acquire credentials for a server running on the current host.
	129	* Requires that the context structure contains a valid OID
	130	*/
	131
	132	/* Returns a GSSAPI error code */
	133	OM_uint32
	134	ssh_gssapi_acquire_cred(Gssctxt *ctx)
	135	{
	136	OM_uint32 status;
	137	char lname[MAXHOSTNAMELEN];
	138	gss_OID_set oidset;
	139
	140	if (options.gss_strict_acceptor) {
	141	gss_create_empty_oid_set(&status, &oidset);
	142	gss_add_oid_set_member(&status, ctx->oid, &oidset);
	143
	144	if (gethostname(lname, MAXHOSTNAMELEN)) {
	145	gss_release_oid_set(&status, &oidset);
	146	return (-1);
	147	}
	148
	149	if (GSS_ERROR(ssh_gssapi_import_name(ctx, lname))) {
	150	gss_release_oid_set(&status, &oidset);
	151	return (ctx->major);
	152	}
	153
	154	if ((ctx->major = gss_acquire_cred(&ctx->minor,
	155	ctx->name, 0, oidset, GSS_C_ACCEPT, &ctx->creds,
	156	NULL, NULL)))
	157	ssh_gssapi_error(ctx);
	158
	159	gss_release_oid_set(&status, &oidset);
	160	return (ctx->major);
	161	} else {
	162	ctx->name = GSS_C_NO_NAME;
	163	ctx->creds = GSS_C_NO_CREDENTIAL;
	164	}
	165	return GSS_S_COMPLETE;
	166	}
	167
0fff78ff	168
	169	/* Wrapper around accept_sec_context
	170	* Requires that the context contains:
	171	* oid
	172	* credentials (from ssh_gssapi_acquire_cred)
	173	*/
2c06c99b	174	/* Privileged */
0fff78ff	175	OM_uint32
	176	ssh_gssapi_accept_ctx(Gssctxt ctx, gss_buffer_desc recv_tok,
	177	gss_buffer_desc send_tok, OM_uint32 flags)
	178	{
	179	OM_uint32 status;
	180	gss_OID mech;
	181
	182	ctx->major = gss_accept_sec_context(&ctx->minor,
	183	&ctx->context, ctx->creds, recv_tok,
	184	GSS_C_NO_CHANNEL_BINDINGS, &ctx->client, &mech,
	185	send_tok, flags, NULL, &ctx->client_creds);
	186
	187	if (GSS_ERROR(ctx->major))
	188	ssh_gssapi_error(ctx);
	189
	190	if (ctx->client_creds)
	191	debug("Received some client credentials");
	192	else
	193	debug("Got no client credentials");
	194
	195	status = ctx->major;
	196
	197	/* Now, if we're complete and we have the right flags, then
	198	* we flag the user as also having been authenticated
	199	*/
	200
	201	if (((flags == NULL) \|\| ((*flags & GSS_C_MUTUAL_FLAG) &&
	202	(*flags & GSS_C_INTEG_FLAG))) && (ctx->major == GSS_S_COMPLETE)) {
	203	if (ssh_gssapi_getclient(ctx, &gssapi_client))
	204	fatal("Couldn't convert client name");
	205	}
	206
	207	return (status);
	208	}
	209
	210	/*
	211	* This parses an exported name, extracting the mechanism specific portion
	212	* to use for ACL checking. It verifies that the name belongs the mechanism
	213	* originally selected.
	214	*/
	215	static OM_uint32
	216	ssh_gssapi_parse_ename(Gssctxt *ctx, gss_buffer_t ename, gss_buffer_t name)
	217	{
665a873d	218	u_char *tok;
0fff78ff	219	OM_uint32 offset;
	220	OM_uint32 oidl;
	221
2c06c99b	222	tok = ename->value;
0fff78ff	223
	224	/*
	225	* Check that ename is long enough for all of the fixed length
	226	* header, and that the initial ID bytes are correct
	227	*/
	228
2c06c99b	229	if (ename->length < 6 \|\| memcmp(tok, "\x04\x01", 2) != 0)
0fff78ff	230	return GSS_S_FAILURE;
	231
	232	/*
	233	* Extract the OID, and check it. Here GSSAPI breaks with tradition
	234	* and does use the OID type and length bytes. To confuse things
	235	* there are two lengths - the first including these, and the
	236	* second without.
	237	*/
	238
9108f8d9	239	oidl = get_u16(tok+2); /* length including next two bytes */
0fff78ff	240	oidl = oidl-2; /* turn it into the _real_ length of the variable OID */
	241
	242	/*
	243	* Check the BER encoding for correct type and length, that the
	244	* string is long enough and that the OID matches that in our context
	245	*/
	246	if (tok[4] != 0x06 \|\| tok[5] != oidl \|\|
	247	ename->length < oidl+6 \|\|
2c06c99b	248	!ssh_gssapi_check_oid(ctx, tok+6, oidl))
0fff78ff	249	return GSS_S_FAILURE;
	250
	251	offset = oidl+6;
	252
	253	if (ename->length < offset+4)
	254	return GSS_S_FAILURE;
	255
9108f8d9	256	name->length = get_u32(tok+offset);
0fff78ff	257	offset += 4;
	258
	259	if (ename->length < offset+name->length)
	260	return GSS_S_FAILURE;
	261
	262	name->value = xmalloc(name->length+1);
9108f8d9	263	memcpy(name->value, tok+offset, name->length);
0fff78ff	264	((char *)name->value)[name->length] = 0;
	265
	266	return GSS_S_COMPLETE;
	267	}
	268
	269	/* Extract the client details from a given context. This can only reliably
	270	* be called once for a context */
	271
2c06c99b	272	/* Privileged (called from accept_secure_ctx) */
0fff78ff	273	OM_uint32
	274	ssh_gssapi_getclient(Gssctxt ctx, ssh_gssapi_client client)
	275	{
	276	int i = 0;
	277
	278	gss_buffer_desc ename;
	279
	280	client->mech = NULL;
	281
	282	while (supported_mechs[i]->name != NULL) {
	283	if (supported_mechs[i]->oid.length == ctx->oid->length &&
	284	(memcmp(supported_mechs[i]->oid.elements,
	285	ctx->oid->elements, ctx->oid->length) == 0))
	286	client->mech = supported_mechs[i];
	287	i++;
	288	}
	289
	290	if (client->mech == NULL)
	291	return GSS_S_FAILURE;
	292
	293	if ((ctx->major = gss_display_name(&ctx->minor, ctx->client,
	294	&client->displayname, NULL))) {
	295	ssh_gssapi_error(ctx);
	296	return (ctx->major);
	297	}
	298
	299	if ((ctx->major = gss_export_name(&ctx->minor, ctx->client,
	300	&ename))) {
	301	ssh_gssapi_error(ctx);
	302	return (ctx->major);
	303	}
	304
	305	if ((ctx->major = ssh_gssapi_parse_ename(ctx,&ename,
	306	&client->exportedname))) {
	307	return (ctx->major);
	308	}
	309
	310	/* We can't copy this structure, so we just move the pointer to it */
	311	client->creds = ctx->client_creds;
	312	ctx->client_creds = GSS_C_NO_CREDENTIAL;
	313	return (ctx->major);
	314	}
	315
cdd66111	316	/* As user - called on fatal/exit */
0fff78ff	317	void
cdd66111	318	ssh_gssapi_cleanup_creds(void)
0fff78ff	319	{
	320	if (gssapi_client.store.filename != NULL) {
	321	/* Unlink probably isn't sufficient */
9108f8d9	322	debug("removing gssapi cred file\"%s\"",
9108f8d9	323	gssapi_client.store.filename);
0fff78ff	324	unlink(gssapi_client.store.filename);
	325	}
	326	}
	327
	328	/* As user */
	329	void
	330	ssh_gssapi_storecreds(void)
	331	{
	332	if (gssapi_client.mech && gssapi_client.mech->storecreds) {
	333	(*gssapi_client.mech->storecreds)(&gssapi_client);
0fff78ff	334	} else
	335	debug("ssh_gssapi_storecreds: Not a GSSAPI mechanism");
	336	}
	337
	338	/* This allows GSSAPI methods to do things to the childs environment based
	339	* on the passed authentication process and credentials.
	340	*/
	341	/* As user */
	342	void
	343	ssh_gssapi_do_child(char **envp, u_int envsizep)
	344	{
	345
	346	if (gssapi_client.store.envvar != NULL &&
	347	gssapi_client.store.envval != NULL) {
0fff78ff	348	debug("Setting %s to %s", gssapi_client.store.envvar,
2c06c99b	349	gssapi_client.store.envval);
0fff78ff	350	child_set_env(envp, envsizep, gssapi_client.store.envvar,
665a873d	351	gssapi_client.store.envval);
0fff78ff	352	}
	353	}
	354
2c06c99b	355	/* Privileged */
0fff78ff	356	int
	357	ssh_gssapi_userok(char *user)
	358	{
665a873d	359	OM_uint32 lmin;
665a873d	360
0fff78ff	361	if (gssapi_client.exportedname.length == 0 \|\|
	362	gssapi_client.exportedname.value == NULL) {
	363	debug("No suitable client data");
	364	return 0;
	365	}
	366	if (gssapi_client.mech && gssapi_client.mech->userok)
665a873d	367	if ((*gssapi_client.mech->userok)(&gssapi_client, user))
	368	return 1;
	369	else {
	370	/* Destroy delegated credentials if userok fails */
	371	gss_release_buffer(&lmin, &gssapi_client.displayname);
	372	gss_release_buffer(&lmin, &gssapi_client.exportedname);
	373	gss_release_cred(&lmin, &gssapi_client.creds);
	374	memset(&gssapi_client, 0, sizeof(ssh_gssapi_client));
	375	return 0;
	376	}
0fff78ff	377	else
	378	debug("ssh_gssapi_userok: Unknown GSSAPI mechanism");
	379	return (0);
	380	}
	381
	382	#endif