/* lib/rpc/svc_auth.c */
/*
 * Copyright (c) 2010, Oracle America, Inc.
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *
 *     * 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.
 *
 *     * Neither the name of the "Oracle America, Inc." nor the names of
 *       its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
 * HOLDER 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.
 */

/*
 * svc_auth_nodes.c, Server-side rpc authenticator interface,
 * *WITHOUT* DES authentication.
 */

#include <gssrpc/rpc.h>

/*
 * 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;
 *
 */

static struct svcauthsw_type {
     enum_t flavor;
     enum auth_stat (*authenticator)(struct svc_req *, struct rpc_msg *,
				     bool_t *);
} svcauthsw[] = {
     {AUTH_GSSAPI, gssrpc__svcauth_gssapi},	/* AUTH_GSSAPI */
     {AUTH_NONE, gssrpc__svcauth_none},		/* AUTH_NONE */
#if 0
     {AUTH_GSSAPI_COMPAT, gssrpc__svcauth_gssapi}, /* AUTH_GSSAPI_COMPAT */
#endif
     {AUTH_UNIX, gssrpc__svcauth_unix},		/* AUTH_UNIX */
     {AUTH_SHORT, gssrpc__svcauth_short},	/* AUTH_SHORT */
     {RPCSEC_GSS, gssrpc__svcauth_gss}		/* RPCSEC_GSS */
};
static int svcauthnum = sizeof(svcauthsw) / sizeof(struct svcauthsw_type);

/*
 * 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.
 */
enum auth_stat
gssrpc__authenticate(
	register struct svc_req *rqst,
	struct rpc_msg *msg,
	bool_t *no_dispatch)
{
	register int cred_flavor, i;

	rqst->rq_cred = msg->rm_call.cb_cred;
	rqst->rq_xprt->xp_verf.oa_flavor = gssrpc__null_auth.oa_flavor;
	rqst->rq_xprt->xp_verf.oa_length = 0;
	cred_flavor = rqst->rq_cred.oa_flavor;
	*no_dispatch = FALSE;
	for (i = 0; i < svcauthnum; i++) {
	     if (cred_flavor == svcauthsw[i].flavor &&
		 svcauthsw[i].authenticator != NULL) {
		  return ((*(svcauthsw[i].authenticator))(rqst,
							  msg,
							  no_dispatch));
	     }
	}

	return (AUTH_REJECTEDCRED);
}