/*-
 * Copyright (c) 2005 Doug Rabson
 * 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
 *
 *	$FreeBSD: releng/9.2/lib/libgssapi/gss_names.c 178828 2008-05-07 13:53:12Z dfr $
 */

#include <gssapi/gssapi.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>

#include "mech_switch.h"
#include "name.h"
#include "utils.h"

/*
 * The implementation must reserve static storage for a
 * gss_OID_desc object containing the value
 * {10, (void *)"\x2a\x86\x48\x86\xf7\x12"
 * "\x01\x02\x01\x01"},
 * corresponding to an object-identifier value of
 * {iso(1) member-body(2) United States(840) mit(113554)
 * infosys(1) gssapi(2) generic(1) user_name(1)}.  The constant
 * GSS_C_NT_USER_NAME should be initialized to point
 * to that gss_OID_desc.
 */
static gss_OID_desc GSS_C_NT_USER_NAME_storage =
	{10, (void *)(uintptr_t)"\x2a\x86\x48\x86\xf7\x12\x01\x02\x01\x01"};
gss_OID GSS_C_NT_USER_NAME = &GSS_C_NT_USER_NAME_storage;

/*
 * The implementation must reserve static storage for a
 * gss_OID_desc object containing the value
 * {10, (void *)"\x2a\x86\x48\x86\xf7\x12"
 *              "\x01\x02\x01\x02"},
 * corresponding to an object-identifier value of
 * {iso(1) member-body(2) United States(840) mit(113554)
 * infosys(1) gssapi(2) generic(1) machine_uid_name(2)}.
 * The constant GSS_C_NT_MACHINE_UID_NAME should be
 * initialized to point to that gss_OID_desc.
 */
static gss_OID_desc GSS_C_NT_MACHINE_UID_NAME_storage =
	{10, (void *)(uintptr_t)"\x2a\x86\x48\x86\xf7\x12\x01\x02\x01\x02"};
gss_OID GSS_C_NT_MACHINE_UID_NAME = &GSS_C_NT_MACHINE_UID_NAME_storage;

/*
 * The implementation must reserve static storage for a
 * gss_OID_desc object containing the value
 * {10, (void *)"\x2a\x86\x48\x86\xf7\x12"
 *              "\x01\x02\x01\x03"},
 * corresponding to an object-identifier value of
 * {iso(1) member-body(2) United States(840) mit(113554)
 * infosys(1) gssapi(2) generic(1) string_uid_name(3)}.
 * The constant GSS_C_NT_STRING_UID_NAME should be
 * initialized to point to that gss_OID_desc.
 */
static gss_OID_desc GSS_C_NT_STRING_UID_NAME_storage =
	{10, (void *)(uintptr_t)"\x2a\x86\x48\x86\xf7\x12\x01\x02\x01\x03"};
gss_OID GSS_C_NT_STRING_UID_NAME = &GSS_C_NT_STRING_UID_NAME_storage;

/*
 * The implementation must reserve static storage for a
 * gss_OID_desc object containing the value
 * {6, (void *)"\x2b\x06\x01\x05\x06\x02"},
 * corresponding to an object-identifier value of
 * {iso(1) org(3) dod(6) internet(1) security(5)
 * nametypes(6) gss-host-based-services(2)).  The constant
 * GSS_C_NT_HOSTBASED_SERVICE_X should be initialized to point
 * to that gss_OID_desc.  This is a deprecated OID value, and
 * implementations wishing to support hostbased-service names
 * should instead use the GSS_C_NT_HOSTBASED_SERVICE OID,
 * defined below, to identify such names;
 * GSS_C_NT_HOSTBASED_SERVICE_X should be accepted a synonym
 * for GSS_C_NT_HOSTBASED_SERVICE when presented as an input
 * parameter, but should not be emitted by GSS-API
 * implementations
 */
static gss_OID_desc GSS_C_NT_HOSTBASED_SERVICE_X_storage =
	{6, (void *)(uintptr_t)"\x2b\x06\x01\x05\x06\x02"};
gss_OID GSS_C_NT_HOSTBASED_SERVICE_X = &GSS_C_NT_HOSTBASED_SERVICE_X_storage;

/*
 * The implementation must reserve static storage for a
 * gss_OID_desc object containing the value
 * {10, (void *)"\x2a\x86\x48\x86\xf7\x12"
 *              "\x01\x02\x01\x04"}, corresponding to an
 * object-identifier value of {iso(1) member-body(2)
 * Unites States(840) mit(113554) infosys(1) gssapi(2)
 * generic(1) service_name(4)}.  The constant
 * GSS_C_NT_HOSTBASED_SERVICE should be initialized
 * to point to that gss_OID_desc.
 */
static gss_OID_desc GSS_C_NT_HOSTBASED_SERVICE_storage =
	{10, (void *)(uintptr_t)"\x2a\x86\x48\x86\xf7\x12\x01\x02\x01\x04"};
gss_OID GSS_C_NT_HOSTBASED_SERVICE = &GSS_C_NT_HOSTBASED_SERVICE_storage;

/*
 * The implementation must reserve static storage for a
 * gss_OID_desc object containing the value
 * {6, (void *)"\x2b\x06\01\x05\x06\x03"},
 * corresponding to an object identifier value of
 * {1(iso), 3(org), 6(dod), 1(internet), 5(security),
 * 6(nametypes), 3(gss-anonymous-name)}.  The constant
 * and GSS_C_NT_ANONYMOUS should be initialized to point
 * to that gss_OID_desc.
 */
static gss_OID_desc GSS_C_NT_ANONYMOUS_storage =
	{6, (void *)(uintptr_t)"\x2b\x06\01\x05\x06\x03"};
gss_OID GSS_C_NT_ANONYMOUS = &GSS_C_NT_ANONYMOUS_storage;

/*
 * The implementation must reserve static storage for a
 * gss_OID_desc object containing the value
 * {6, (void *)"\x2b\x06\x01\x05\x06\x04"},
 * corresponding to an object-identifier value of
 * {1(iso), 3(org), 6(dod), 1(internet), 5(security),
 * 6(nametypes), 4(gss-api-exported-name)}.  The constant
 * GSS_C_NT_EXPORT_NAME should be initialized to point
 * to that gss_OID_desc.
 */
static gss_OID_desc GSS_C_NT_EXPORT_NAME_storage =
	{6, (void *)(uintptr_t)"\x2b\x06\x01\x05\x06\x04"};
gss_OID GSS_C_NT_EXPORT_NAME = &GSS_C_NT_EXPORT_NAME_storage;

/*
 *   This name form shall be represented by the Object Identifier {iso(1)
 *   member-body(2) United States(840) mit(113554) infosys(1) gssapi(2)
 *   krb5(2) krb5_name(1)}.  The recommended symbolic name for this type
 *   is "GSS_KRB5_NT_PRINCIPAL_NAME".
 */
static gss_OID_desc GSS_KRB5_NT_PRINCIPAL_NAME_storage =
        {10, (void *)(uintptr_t)"\x2a\x86\x48\x86\xf7\x12\x01\x02\x02\x01"};
gss_OID GSS_KRB5_NT_PRINCIPAL_NAME = &GSS_KRB5_NT_PRINCIPAL_NAME_storage;

/*
 * This name form shall be represented by the Object Identifier {iso(1)
 * member-body(2) United States(840) mit(113554) infosys(1) gssapi(2)
 * generic(1) user_name(1)}.  The recommended symbolic name for this
 * type is "GSS_KRB5_NT_USER_NAME".
 */
gss_OID GSS_KRB5_NT_USER_NAME = &GSS_C_NT_USER_NAME_storage;

/*
 * This name form shall be represented by the Object Identifier {iso(1)
 * member-body(2) United States(840) mit(113554) infosys(1) gssapi(2)
 * generic(1) machine_uid_name(2)}.  The recommended symbolic name for
 * this type is "GSS_KRB5_NT_MACHINE_UID_NAME".
 */
gss_OID GSS_KRB5_NT_MACHINE_UID_NAME = &GSS_C_NT_MACHINE_UID_NAME_storage;

/*
 * This name form shall be represented by the Object Identifier {iso(1)
 * member-body(2) United States(840) mit(113554) infosys(1) gssapi(2)
 * generic(1) string_uid_name(3)}.  The recommended symbolic name for
 * this type is "GSS_KRB5_NT_STRING_UID_NAME".
 */
gss_OID GSS_KRB5_NT_STRING_UID_NAME = &GSS_C_NT_STRING_UID_NAME_storage;

OM_uint32
_gss_find_mn(OM_uint32 *minor_status, struct _gss_name *name, gss_OID mech, 
	     struct _gss_mechanism_name **output_mn)
{
	OM_uint32 major_status;
	struct _gss_mech_switch *m;
	struct _gss_mechanism_name *mn;

	*output_mn = NULL;

	SLIST_FOREACH(mn, &name->gn_mn, gmn_link) {
		if (gss_oid_equal(mech, mn->gmn_mech_oid))
			break;
	}

	if (!mn) {
		/*
		 * If this name is canonical (i.e. there is only an
		 * MN but it is from a different mech), give up now.
		 */
		if (!name->gn_value.value)
			return (GSS_S_BAD_NAME);

		m = _gss_find_mech_switch(mech);
		if (!m)
			return (GSS_S_BAD_MECH);

		mn = malloc(sizeof(struct _gss_mechanism_name));
		if (!mn)
			return (GSS_S_FAILURE);
		
		major_status = m->gm_import_name(minor_status,
		    &name->gn_value,
		    (name->gn_type.elements
			? &name->gn_type : GSS_C_NO_OID),
		    &mn->gmn_name);
		if (major_status != GSS_S_COMPLETE) {
			_gss_mg_error(m, major_status, *minor_status);
			free(mn);
			return (major_status);
		}

		mn->gmn_mech = m;
		mn->gmn_mech_oid = &m->gm_mech_oid;
		SLIST_INSERT_HEAD(&name->gn_mn, mn, gmn_link);
	}
	*output_mn = mn;
	return (GSS_S_COMPLETE);
}


/*
 * Make a name from an MN.
 */
struct _gss_name *
_gss_make_name(struct _gss_mech_switch *m, gss_name_t new_mn)
{
	struct _gss_name *name;
	struct _gss_mechanism_name *mn;

	name = malloc(sizeof(struct _gss_name));
	if (!name)
		return (0);
	memset(name, 0, sizeof(struct _gss_name));

	mn = malloc(sizeof(struct _gss_mechanism_name));
	if (!mn) {
		free(name);
		return (0);
	}

	SLIST_INIT(&name->gn_mn);
	mn->gmn_mech = m;
	mn->gmn_mech_oid = &m->gm_mech_oid;
	mn->gmn_name = new_mn;
	SLIST_INSERT_HEAD(&name->gn_mn, mn, gmn_link);

	return (name);
}

