[openssh.git] / gss-serv.c

/* $OpenBSD: gss-serv.c,v 1.22 2008/05/08 12:02:23 djm 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 <sys/param.h>

#include <stdarg.h>
#include <string.h>
#include <unistd.h>

#include "openbsd-compat/sys-queue.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 "ssh-gss.h"

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,
};


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

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

	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);
}

/* Privileged */
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));
}

/* 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);
}


/* 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);
}

/* Privileged */
OM_uint32
ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
{
	ctx->major = gss_verify_mic(&ctx->minor, ctx->context,
	    gssbuf, gssmic, NULL);

	return (ctx->major);
}

#endif
Commit	Line	Data
3593bdc0	1	/* $OpenBSD: gss-serv.c,v 1.22 2008/05/08 12:02:23 djm Exp $ */
7364bd04	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
31652869	31	#include <sys/types.h>
73d4e9cc	32	#include <sys/param.h>
31652869	33
24436b92	34	#include <stdarg.h>
00146caa	35	#include <string.h>
28cb0a43	36	#include <unistd.h>
00146caa	37
3593bdc0	38	#include "openbsd-compat/sys-queue.h"
31652869	39	#include "xmalloc.h"
	40	#include "buffer.h"
	41	#include "key.h"
	42	#include "hostfile.h"
7364bd04	43	#include "auth.h"
	44	#include "log.h"
	45	#include "channels.h"
	46	#include "session.h"
51e7a012	47	#include "misc.h"
7364bd04	48
	49	#include "ssh-gss.h"
	50
7364bd04	51	static ssh_gssapi_client gssapi_client =
	52	{ GSS_C_EMPTY_BUFFER, GSS_C_EMPTY_BUFFER,
	53	GSS_C_NO_CREDENTIAL, NULL, {NULL, NULL, NULL}};
	54
	55	ssh_gssapi_mech gssapi_null_mech =
	56	{ NULL, NULL, {0, NULL}, NULL, NULL, NULL, NULL};
	57
	58	#ifdef KRB5
	59	extern ssh_gssapi_mech gssapi_kerberos_mech;
	60	#endif
	61
	62	ssh_gssapi_mech* supported_mechs[]= {
	63	#ifdef KRB5
	64	&gssapi_kerberos_mech,
	65	#endif
	66	&gssapi_null_mech,
	67	};
	68
73d4e9cc	69
	70	/*
	71	* Acquire credentials for a server running on the current host.
	72	* Requires that the context structure contains a valid OID
	73	*/
	74
	75	/* Returns a GSSAPI error code */
	76	/* Privileged (called from ssh_gssapi_server_ctx) */
	77	static OM_uint32
	78	ssh_gssapi_acquire_cred(Gssctxt *ctx)
	79	{
	80	OM_uint32 status;
	81	char lname[MAXHOSTNAMELEN];
	82	gss_OID_set oidset;
	83
	84	gss_create_empty_oid_set(&status, &oidset);
	85	gss_add_oid_set_member(&status, ctx->oid, &oidset);
	86
	87	if (gethostname(lname, MAXHOSTNAMELEN)) {
	88	gss_release_oid_set(&status, &oidset);
	89	return (-1);
	90	}
	91
	92	if (GSS_ERROR(ssh_gssapi_import_name(ctx, lname))) {
	93	gss_release_oid_set(&status, &oidset);
	94	return (ctx->major);
	95	}
	96
	97	if ((ctx->major = gss_acquire_cred(&ctx->minor,
	98	ctx->name, 0, oidset, GSS_C_ACCEPT, &ctx->creds, NULL, NULL)))
	99	ssh_gssapi_error(ctx);
	100
	101	gss_release_oid_set(&status, &oidset);
	102	return (ctx->major);
	103	}
	104
	105	/* Privileged */
	106	OM_uint32
	107	ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID oid)
	108	{
	109	if (*ctx)
	110	ssh_gssapi_delete_ctx(ctx);
	111	ssh_gssapi_build_ctx(ctx);
	112	ssh_gssapi_set_oid(*ctx, oid);
	113	return (ssh_gssapi_acquire_cred(*ctx));
	114	}
	115
6e902aec	116	/* Unprivileged */
7364bd04	117	void
	118	ssh_gssapi_supported_oids(gss_OID_set *oidset)
	119	{
	120	int i = 0;
	121	OM_uint32 min_status;
	122	int present;
	123	gss_OID_set supported;
	124
	125	gss_create_empty_oid_set(&min_status, oidset);
	126	gss_indicate_mechs(&min_status, &supported);
	127
	128	while (supported_mechs[i]->name != NULL) {
	129	if (GSS_ERROR(gss_test_oid_set_member(&min_status,
	130	&supported_mechs[i]->oid, supported, &present)))
	131	present = 0;
	132	if (present)
	133	gss_add_oid_set_member(&min_status,
	134	&supported_mechs[i]->oid, oidset);
	135	i++;
	136	}
7cd30d48	137
7cd30d48	138	gss_release_oid_set(&min_status, &supported);
7364bd04	139	}
	140
	141
	142	/* Wrapper around accept_sec_context
	143	* Requires that the context contains:
	144	* oid
	145	* credentials (from ssh_gssapi_acquire_cred)
	146	*/
6e902aec	147	/* Privileged */
7364bd04	148	OM_uint32
	149	ssh_gssapi_accept_ctx(Gssctxt ctx, gss_buffer_desc recv_tok,
	150	gss_buffer_desc send_tok, OM_uint32 flags)
	151	{
	152	OM_uint32 status;
	153	gss_OID mech;
	154
	155	ctx->major = gss_accept_sec_context(&ctx->minor,
	156	&ctx->context, ctx->creds, recv_tok,
	157	GSS_C_NO_CHANNEL_BINDINGS, &ctx->client, &mech,
	158	send_tok, flags, NULL, &ctx->client_creds);
	159
	160	if (GSS_ERROR(ctx->major))
	161	ssh_gssapi_error(ctx);
	162
	163	if (ctx->client_creds)
	164	debug("Received some client credentials");
	165	else
	166	debug("Got no client credentials");
	167
	168	status = ctx->major;
	169
	170	/* Now, if we're complete and we have the right flags, then
	171	* we flag the user as also having been authenticated
	172	*/
	173
	174	if (((flags == NULL) \|\| ((*flags & GSS_C_MUTUAL_FLAG) &&
	175	(*flags & GSS_C_INTEG_FLAG))) && (ctx->major == GSS_S_COMPLETE)) {
	176	if (ssh_gssapi_getclient(ctx, &gssapi_client))
	177	fatal("Couldn't convert client name");
	178	}
	179
	180	return (status);
	181	}
	182
	183	/*
	184	* This parses an exported name, extracting the mechanism specific portion
	185	* to use for ACL checking. It verifies that the name belongs the mechanism
	186	* originally selected.
	187	*/
	188	static OM_uint32
	189	ssh_gssapi_parse_ename(Gssctxt *ctx, gss_buffer_t ename, gss_buffer_t name)
	190	{
2ceb8101	191	u_char *tok;
7364bd04	192	OM_uint32 offset;
7364bd04	193	OM_uint32 oidl;
a7958e7b	194
8442cc66	195	tok = ename->value;
a7958e7b	196
	197	/*
	198	* Check that ename is long enough for all of the fixed length
7364bd04	199	* header, and that the initial ID bytes are correct
	200	*/
	201
8442cc66	202	if (ename->length < 6 \|\| memcmp(tok, "\x04\x01", 2) != 0)
7364bd04	203	return GSS_S_FAILURE;
	204
	205	/*
	206	* Extract the OID, and check it. Here GSSAPI breaks with tradition
	207	* and does use the OID type and length bytes. To confuse things
	208	* there are two lengths - the first including these, and the
	209	* second without.
	210	*/
	211
51e7a012	212	oidl = get_u16(tok+2); /* length including next two bytes */
7364bd04	213	oidl = oidl-2; /* turn it into the _real_ length of the variable OID */
	214
	215	/*
	216	* Check the BER encoding for correct type and length, that the
	217	* string is long enough and that the OID matches that in our context
	218	*/
	219	if (tok[4] != 0x06 \|\| tok[5] != oidl \|\|
a7958e7b	220	ename->length < oidl+6 \|\|
8442cc66	221	!ssh_gssapi_check_oid(ctx, tok+6, oidl))
7364bd04	222	return GSS_S_FAILURE;
	223
	224	offset = oidl+6;
a7958e7b	225
7364bd04	226	if (ename->length < offset+4)
7364bd04	227	return GSS_S_FAILURE;
a7958e7b	228
51e7a012	229	name->length = get_u32(tok+offset);
7364bd04	230	offset += 4;
a7958e7b	231
7364bd04	232	if (ename->length < offset+name->length)
a7958e7b	233	return GSS_S_FAILURE;
a7958e7b	234
96573c26	235	name->value = xmalloc(name->length+1);
1720c23b	236	memcpy(name->value, tok+offset, name->length);
96573c26	237	((char *)name->value)[name->length] = 0;
96573c26	238
7364bd04	239	return GSS_S_COMPLETE;
a7958e7b	240	}
7364bd04	241
	242	/* Extract the client details from a given context. This can only reliably
	243	* be called once for a context */
	244
6e902aec	245	/* Privileged (called from accept_secure_ctx) */
7364bd04	246	OM_uint32
	247	ssh_gssapi_getclient(Gssctxt ctx, ssh_gssapi_client client)
	248	{
	249	int i = 0;
	250
	251	gss_buffer_desc ename;
a7958e7b	252
7364bd04	253	client->mech = NULL;
	254
	255	while (supported_mechs[i]->name != NULL) {
	256	if (supported_mechs[i]->oid.length == ctx->oid->length &&
	257	(memcmp(supported_mechs[i]->oid.elements,
	258	ctx->oid->elements, ctx->oid->length) == 0))
	259	client->mech = supported_mechs[i];
	260	i++;
	261	}
	262
a7958e7b	263	if (client->mech == NULL)
7364bd04	264	return GSS_S_FAILURE;
a7958e7b	265
a7958e7b	266	if ((ctx->major = gss_display_name(&ctx->minor, ctx->client,
7364bd04	267	&client->displayname, NULL))) {
a7958e7b	268	ssh_gssapi_error(ctx);
a7958e7b	269	return (ctx->major);
7364bd04	270	}
a7958e7b	271
a7958e7b	272	if ((ctx->major = gss_export_name(&ctx->minor, ctx->client,
7364bd04	273	&ename))) {
	274	ssh_gssapi_error(ctx);
	275	return (ctx->major);
	276	}
a7958e7b	277
7364bd04	278	if ((ctx->major = ssh_gssapi_parse_ename(ctx,&ename,
	279	&client->exportedname))) {
	280	return (ctx->major);
	281	}
	282
	283	/* We can't copy this structure, so we just move the pointer to it */
	284	client->creds = ctx->client_creds;
	285	ctx->client_creds = GSS_C_NO_CREDENTIAL;
	286	return (ctx->major);
	287	}
	288
2362db19	289	/* As user - called on fatal/exit */
7364bd04	290	void
2362db19	291	ssh_gssapi_cleanup_creds(void)
7364bd04	292	{
	293	if (gssapi_client.store.filename != NULL) {
	294	/* Unlink probably isn't sufficient */
1720c23b	295	debug("removing gssapi cred file\"%s\"",
1720c23b	296	gssapi_client.store.filename);
7364bd04	297	unlink(gssapi_client.store.filename);
	298	}
	299	}
	300
	301	/* As user */
	302	void
	303	ssh_gssapi_storecreds(void)
	304	{
	305	if (gssapi_client.mech && gssapi_client.mech->storecreds) {
	306	(*gssapi_client.mech->storecreds)(&gssapi_client);
7364bd04	307	} else
	308	debug("ssh_gssapi_storecreds: Not a GSSAPI mechanism");
	309	}
	310
	311	/* This allows GSSAPI methods to do things to the childs environment based
	312	* on the passed authentication process and credentials.
	313	*/
	314	/* As user */
	315	void
	316	ssh_gssapi_do_child(char **envp, u_int envsizep)
	317	{
	318
	319	if (gssapi_client.store.envvar != NULL &&
	320	gssapi_client.store.envval != NULL) {
7364bd04	321	debug("Setting %s to %s", gssapi_client.store.envvar,
8442cc66	322	gssapi_client.store.envval);
7364bd04	323	child_set_env(envp, envsizep, gssapi_client.store.envvar,
4e2e5cfd	324	gssapi_client.store.envval);
7364bd04	325	}
	326	}
	327
67003554	328	/* Privileged */
7364bd04	329	int
	330	ssh_gssapi_userok(char *user)
	331	{
fe206de9	332	OM_uint32 lmin;
fe206de9	333
7364bd04	334	if (gssapi_client.exportedname.length == 0 \|\|
	335	gssapi_client.exportedname.value == NULL) {
	336	debug("No suitable client data");
	337	return 0;
	338	}
	339	if (gssapi_client.mech && gssapi_client.mech->userok)
fe206de9	340	if ((*gssapi_client.mech->userok)(&gssapi_client, user))
	341	return 1;
	342	else {
	343	/* Destroy delegated credentials if userok fails */
	344	gss_release_buffer(&lmin, &gssapi_client.displayname);
	345	gss_release_buffer(&lmin, &gssapi_client.exportedname);
	346	gss_release_cred(&lmin, &gssapi_client.creds);
	347	memset(&gssapi_client, 0, sizeof(ssh_gssapi_client));
	348	return 0;
	349	}
7364bd04	350	else
	351	debug("ssh_gssapi_userok: Unknown GSSAPI mechanism");
	352	return (0);
	353	}
	354
6e902aec	355	/* Privileged */
0789992b	356	OM_uint32
	357	ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
	358	{
	359	ctx->major = gss_verify_mic(&ctx->minor, ctx->context,
	360	gssbuf, gssmic, NULL);
	361
	362	return (ctx->major);
	363	}
	364
7364bd04	365	#endif