/*-
 * Copyright (c) 2009, Sun Microsystems, 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 Sun Microsystems, 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_unix.c 1.28 88/02/08 Copyr 1984 Sun Micro
 * @(#)svc_auth_unix.c  2.3 88/08/01 4.0 RPCSRC
 * $FreeBSD: src/lib/libc/rpc/svc_auth_unix.c,v 1.11 2004/10/16 06:11:35 obrien Exp $
 */

/*
 * svc_auth_unix.c
 * Handles UNIX flavor authentication parameters on the service side of rpc.
 * There are two svc auth implementations here: AUTH_UNIX and AUTH_SHORT.
 * _svcauth_unix does full blown unix style uid,gid+gids auth,
 * _svcauth_short uses a shorthand auth to index into a cache of longhand auths.
 * Note: the shorthand has been gutted for efficiency.
 *
 * Copyright (C) 1984, Sun Microsystems, Inc.
 */

#include "namespace.h"
#include <assert.h>
#include <stdio.h>
#include <string.h>

#include <rpc/rpc.h>
#include "un-namespace.h"

/*
 * Unix longhand authenticator
 */
enum auth_stat
_svcauth_unix(struct svc_req *rqst, struct rpc_msg *msg)
{
        enum auth_stat stat;
        XDR xdrs;
        struct authunix_parms *aup;
        int32_t *buf;
        struct area {
                struct authunix_parms area_aup;
                char area_machname[MAX_MACHINE_NAME+1];
                int area_gids[NGRPS];
        } *area;
        u_int auth_len;
        size_t str_len, gid_len;
        u_int i;

        assert(rqst != NULL);
        assert(msg != NULL);

        area = (struct area *) rqst->rq_clntcred;
        aup = &area->area_aup;
        aup->aup_machname = area->area_machname;
        aup->aup_gids = area->area_gids;
        auth_len = (u_int)msg->rm_call.cb_cred.oa_length;
        xdrmem_create(&xdrs, msg->rm_call.cb_cred.oa_base, auth_len,XDR_DECODE);
        buf = XDR_INLINE(&xdrs, auth_len);
        if (buf != NULL) {
                aup->aup_time = IXDR_GET_INT32(buf);
                str_len = (size_t)IXDR_GET_U_INT32(buf);
                if (str_len > MAX_MACHINE_NAME) {
                        stat = AUTH_BADCRED;
                        goto done;
                }
                memmove(aup->aup_machname, buf, str_len);
                aup->aup_machname[str_len] = 0;
                str_len = RNDUP(str_len);
                buf += str_len / sizeof (int32_t);
                aup->aup_uid = (int)IXDR_GET_INT32(buf);
                aup->aup_gid = (int)IXDR_GET_INT32(buf);
                gid_len = (size_t)IXDR_GET_U_INT32(buf);
                if (gid_len > NGRPS) {
                        stat = AUTH_BADCRED;
                        goto done;
                }
                aup->aup_len = gid_len;
                for (i = 0; i < gid_len; i++) {
                        aup->aup_gids[i] = (int)IXDR_GET_INT32(buf);
                }
                /*
                 * five is the smallest unix credentials structure -
                 * timestamp, hostname len (0), uid, gid, and gids len (0).
                 */
                if ((5 + gid_len) * BYTES_PER_XDR_UNIT + str_len > auth_len) {
                        printf("bad auth_len gid %ld str %ld auth %u\n",
                            (long)gid_len, (long)str_len, auth_len);
                        stat = AUTH_BADCRED;
                        goto done;
                }
        } else if (! xdr_authunix_parms(&xdrs, aup)) {
                xdrs.x_op = XDR_FREE;
                xdr_authunix_parms(&xdrs, aup);
                stat = AUTH_BADCRED;
                goto done;
        }

       /* get the verifier */
        if ((u_int)msg->rm_call.cb_verf.oa_length) {
                rqst->rq_xprt->xp_verf.oa_flavor =
                        msg->rm_call.cb_verf.oa_flavor;
                rqst->rq_xprt->xp_verf.oa_base =
                        msg->rm_call.cb_verf.oa_base;
                rqst->rq_xprt->xp_verf.oa_length =
                        msg->rm_call.cb_verf.oa_length;
        } else {
                rqst->rq_xprt->xp_verf.oa_flavor = AUTH_NULL;
                rqst->rq_xprt->xp_verf.oa_length = 0;
        }
        stat = AUTH_OK;
done:
        XDR_DESTROY(&xdrs);
        return (stat);
}


/*
 * Shorthand unix authenticator
 * Looks up longhand in a cache.
 */
/*ARGSUSED*/
enum auth_stat
_svcauth_short(struct svc_req *rqst __unused, struct rpc_msg *msg __unused)
{
        return (AUTH_REJECTEDCRED);
}