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/*

 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for

 * unrestricted use provided that this legend is included on all tape

 * media and as a part of the software program in whole or part.  Users

 * may copy or modify Sun RPC without charge, but are not authorized

 * to license or distribute it to anyone else except as part of a product or

 * program developed by the user.

 *

 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE

 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.

 *

 * Sun RPC is provided with no support and without any obligation on the

 * part of Sun Microsystems, Inc. to assist in its use, correction,

 * modification or enhancement.

 *

 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE

 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC

 * OR ANY PART THEREOF.

 *

 * In no event will Sun Microsystems, Inc. be liable for any lost revenue

 * or profits or other special, indirect and consequential damages, even if

 * Sun has been advised of the possibility of such damages.

 *

 * Sun Microsystems, Inc.

 * 2550 Garcia Avenue

 * Mountain View, California  94043

 */

/*

 * Copyright (c) 1986-1991 by Sun Microsystems Inc.

 */

#ident  "@(#)svc_auth.c 1.16    94/04/24 SMI"

#if !defined(lint) && defined(SCCSIDS)

#if 0

static char sccsid[] = "@(#)svc_auth.c 1.26 89/02/07 Copyr 1984 Sun Micro";

#else

static const char rcsid[] =

 "$FreeBSD: src/lib/libc/rpc/svc_auth.c,v 1.7 1999/12/29 05:04:16 peter Exp $";

#endif

#endif

/*

 * svc_auth.c, Server-side rpc authenticator interface.

 *

 */

#ifdef _KERNEL

#include <sys/param.h>

#include <rpc/types.h>

#include <rpc/xdr.h>

#include <rpc/auth.h>

#include <rpc/clnt.h>

#include <rpc/rpc_msg.h>

#include <rpc/svc.h>

#include <rpc/svc_auth.h>

#else

#include <stdlib.h>

#include <rpc/rpc.h>

#endif

#include <sys/types.h>

/*

 * svcauthsw is the bdevsw of server side authentication.

 *

 * Server side authenticators are called from authenticate by

 * using the client auth struct flavor field to index into svcauthsw.

 * The server auth flavors must implement a routine that looks

 * like:

 *

 *      enum auth_stat

 *      flavorx_auth(rqst, msg)

 *              register struct svc_req *rqst;

 *              register struct rpc_msg *msg;

 *

 */

enum auth_stat _svcauth_null(); /* no authentication */

enum auth_stat _svcauth_unix();         /* (system) unix style (uid, gids) */

enum auth_stat _svcauth_short();        /* short hand unix style */

enum auth_stat _svcauth_des();          /* des style */

/* declarations to allow servers to specify new authentication flavors */

struct authsvc {

        int     flavor;

        enum    auth_stat (*handler)();

        struct  authsvc   *next;

};

#define Auths ((struct authsvc *)((struct rtems_rpc_task_variables *)rtems_rpc_task_variables)->svc_auths_Auths)

/*

 * The call rpc message, msg has been obtained from the wire.  The msg contains

 * the raw form of credentials and verifiers.  authenticate returns AUTH_OK

 * if the msg is successfully authenticated.  If AUTH_OK then the routine also

 * does the following things:

 * set rqst->rq_xprt->verf to the appropriate response verifier;

 * sets rqst->rq_client_cred to the "cooked" form of the credentials.

 *

 * NB: rqst->rq_cxprt->verf must be pre-alloctaed;

 * its length is set appropriately.

 *

 * The caller still owns and is responsible for msg->u.cmb.cred and

 * msg->u.cmb.verf.  The authentication system retains ownership of

 * rqst->rq_client_cred, the cooked credentials.

 *

 * There is an assumption that any flavour less than AUTH_NULL is

 * invalid.

 */

enum auth_stat

_authenticate(rqst, msg)

        register struct svc_req *rqst;

        struct rpc_msg *msg;

{

        register int cred_flavor;

        register struct authsvc *asp;

        rqst->rq_cred = msg->rm_call.cb_cred;

        rqst->rq_xprt->xp_verf.oa_flavor = _null_auth.oa_flavor;

        rqst->rq_xprt->xp_verf.oa_length = 0;

        cred_flavor = rqst->rq_cred.oa_flavor;

        switch (cred_flavor) {

        case AUTH_NULL:

                return(_svcauth_null(rqst, msg));

        case AUTH_UNIX:

                return(_svcauth_unix(rqst, msg));

        case AUTH_SHORT:

                return(_svcauth_short(rqst, msg));

        /*

         * We leave AUTH_DES turned off by default because svcauth_des()

         * needs getpublickey(), which is in librpcsvc, not libc. If we

         * included AUTH_DES as a built-in flavor, programs that don't

         * have -lrpcsvc in their Makefiles wouldn't link correctly, even

         * though they don't use AUTH_DES. And I'm too lazy to go through

         * the tree looking for all of them.

         */

#ifdef DES_BUILTIN

        case AUTH_DES:

                return(_svcauth_des(rqst, msg));

#endif

        }

        /* flavor doesn't match any of the builtin types, so try new ones */

        for (asp = Auths; asp; asp = asp->next) {

                if (asp->flavor == cred_flavor) {

                        enum auth_stat as;

                        as = (*asp->handler)(rqst, msg);

                        return (as);

                }

        }

        return (AUTH_REJECTEDCRED);

}

/*ARGSUSED*/

enum auth_stat

_svcauth_null(rqst, msg)

        struct svc_req *rqst;

        struct rpc_msg *msg;

{

        return (AUTH_OK);

}

/*

 *  Allow the rpc service to register new authentication types that it is

 *  prepared to handle.  When an authentication flavor is registered,

 *  the flavor is checked against already registered values.  If not

 *  registered, then a new Auths entry is added on the list.

 *

 *  There is no provision to delete a registration once registered.

 *

 *  This routine returns:

 *       0 if registration successful

 *       1 if flavor already registered

 *      -1 if can't register (errno set)

 */

int

svc_auth_reg(cred_flavor, handler)

        register int cred_flavor;

        enum auth_stat (*handler)();

{

        register struct authsvc *asp;

        switch (cred_flavor) {

            case AUTH_NULL:

            case AUTH_UNIX:

            case AUTH_SHORT:

#ifdef DES_BUILTIN

            case AUTH_DES:

#endif

                /* already registered */

                return (1);

            default:

                for (asp = Auths; asp; asp = asp->next) {

                        if (asp->flavor == cred_flavor) {

                                /* already registered */

                                return (1);

                        }

                }

                /* this is a new one, so go ahead and register it */

                asp = (struct authsvc *)mem_alloc(sizeof (*asp));

                if (asp == NULL) {

                        return (-1);

                }

                asp->flavor = cred_flavor;

                asp->handler = handler;

                asp->next = Auths;

                Auths = asp;

                break;

        }

        return (0);

}