/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
 */

/*
 *  glue routine for gss_compare_name
 *
 */

#include <mechglueP.h>
#include "gssapiP_generic.h"
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#include <string.h>

static OM_uint32
val_comp_name_args(
	OM_uint32 *minor_status,
	gss_name_t name1,
	gss_name_t name2,
	int *name_equal)
{

	/* Initialize outputs. */

	if (minor_status != NULL)
		*minor_status = 0;

	/* Validate arguments. */

	if (name1 == GSS_C_NO_NAME || name2 == GSS_C_NO_NAME)
		return (GSS_S_CALL_INACCESSIBLE_READ | GSS_S_BAD_NAME);

	if (name_equal == NULL)
		return (GSS_S_CALL_INACCESSIBLE_WRITE);

	return (GSS_S_COMPLETE);
}

OM_uint32
gss_compare_name(minor_status,
			name1,
			name2,
			name_equal)

OM_uint32 *minor_status;
const gss_name_t name1;
const gss_name_t name2;
int *name_equal;

{
	OM_uint32		major_status, temp_minor;
	gss_union_name_t	union_name1, union_name2;
	gss_mechanism		mech = NULL;
	gss_name_t		internal_name;

	major_status = val_comp_name_args(minor_status,
					name1, name2, name_equal);
	if (major_status != GSS_S_COMPLETE)
		return (major_status);

	union_name1 = (gss_union_name_t)name1;
	union_name2 = (gss_union_name_t)name2;
	/*
	 * Try our hardest to make union_name1 be the mechanism-specific
	 * name.  (Of course we can't if both names aren't
	 * mechanism-specific.)
	 */
	if (union_name1->mech_type == 0) {
		union_name1 = (gss_union_name_t)name2;
		union_name2 = (gss_union_name_t)name1;
	}
	/*
	 * If union_name1 is mechanism specific, then fetch its mechanism
	 * information.
	 */
	if (union_name1->mech_type) {
		mech = __gss_get_mechanism(union_name1->mech_type);
		if (!mech)
			return (GSS_S_BAD_MECH);
		if (!mech->gss_compare_name)
			return (GSS_S_UNAVAILABLE);
	}

	*name_equal = 0;	/* Default to *not* equal.... */

	/*
	 * First case... both names are mechanism-specific
	 */
	if (union_name1->mech_type && union_name2->mech_type) {
		if (!g_OID_equal(union_name1->mech_type,
					union_name2->mech_type))
			return (GSS_S_COMPLETE);
		if ((union_name1->mech_name == 0) ||
			(union_name2->mech_name == 0))
			/* should never happen */
			return (GSS_S_BAD_NAME);
		if (!mech)
			return (GSS_S_BAD_MECH);
		if (!mech->gss_compare_name)
			return (GSS_S_UNAVAILABLE);
		major_status = mech->gss_compare_name(mech->context,
						    minor_status,
						    union_name1->mech_name,
						    union_name2->mech_name,
						    name_equal);
		if (major_status != GSS_S_COMPLETE)
			map_error(minor_status, mech);
		return major_status;
	}

	/*
	 * Second case... both names are NOT mechanism specific.
	 *
	 * All we do here is make sure the two name_types are equal and then
	 * that the external_names are equal. Note the we do not take care
	 * of the case where two different external names map to the same
	 * internal name. We cannot determine this, since we as yet do not
	 * know what mechanism to use for calling the underlying
	 * gss_import_name().
	 */
	if (!union_name1->mech_type && !union_name2->mech_type) {
		/*
		 * Second case, first sub-case... one name has null
		 * name_type, the other doesn't.
		 *
		 * Not knowing a mech_type we can't import the name with
		 * null name_type so we can't compare.
		 */
		if ((union_name1->name_type == GSS_C_NULL_OID &&
		    union_name2->name_type != GSS_C_NULL_OID) ||
		    (union_name1->name_type != GSS_C_NULL_OID &&
		    union_name2->name_type == GSS_C_NULL_OID))
			return (GSS_S_COMPLETE);
		/*
		 * Second case, second sub-case... both names have
		 * name_types, but they are different.
		 */
		if ((union_name1->name_type != GSS_C_NULL_OID &&
		    union_name2->name_type != GSS_C_NULL_OID) &&
		    !g_OID_equal(union_name1->name_type,
					union_name2->name_type))
			return (GSS_S_COMPLETE);
		/*
		 * Second case, third sub-case... both names have equal
		 * name_types (and both have no mech_types) so we just
		 * compare the external_names.
		 */
		if ((union_name1->external_name->length !=
			union_name2->external_name->length) ||
			(memcmp(union_name1->external_name->value,
				union_name2->external_name->value,
				union_name1->external_name->length) != 0))
			return (GSS_S_COMPLETE);
		*name_equal = 1;
		return (GSS_S_COMPLETE);
	}

	/*
	 * Final case... one name is mechanism specific, the other isn't.
	 *
	 * We attempt to convert the general name to the mechanism type of
	 * the mechanism-specific name, and then do the compare.  If we
	 * can't import the general name, then we return that the name is
	 * _NOT_ equal.
	 */
	if (union_name2->mech_type) {
		/* We make union_name1 the mechanism specific name. */
		union_name1 = (gss_union_name_t)name2;
		union_name2 = (gss_union_name_t)name1;
	}
	major_status = __gss_import_internal_name(minor_status,
							union_name1->mech_type,
							union_name2,
							&internal_name);
	if (major_status != GSS_S_COMPLETE)
		return (GSS_S_COMPLETE); /* return complete, but not equal */

	if (!mech)
		return (GSS_S_BAD_MECH);
	if (!mech->gss_compare_name)
		return (GSS_S_UNAVAILABLE);
	major_status = mech->gss_compare_name(mech->context, minor_status,
							union_name1->mech_name,
							internal_name,
							name_equal);
	if (major_status != GSS_S_COMPLETE)
		map_error(minor_status, mech);
	(void) __gss_release_internal_name(&temp_minor, union_name1->mech_type,
					&internal_name);
	return (major_status);
}