lib/librpc/rpc/svc_auth_unix.c

/*
 * 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
 */

#if defined(LIBC_SCCS) && !defined(lint)
/*static char *sccsid = "from: @(#)svc_auth_unix.c 1.28 88/02/08 Copyr 1984 Sun Micro";*/
/*static char *sccsid = "from: @(#)svc_auth_unix.c      2.3 88/08/01 4.0 RPCSRC";*/
static char *rcsid = "$Id: svc_auth_unix.c,v 1.3 1993/08/26 00:53:39 jtc Exp $";
#endif

/*
 * 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 <stdio.h>
#include <rpc/rpc.h>

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

        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_LONG(buf);
                str_len = IXDR_GET_U_LONG(buf);
                if (str_len > MAX_MACHINE_NAME) {
                        stat = AUTH_BADCRED;
                        goto done;
                }
                bcopy((caddr_t)buf, aup->aup_machname, (u_int)str_len);
                aup->aup_machname[str_len] = 0;
                str_len = RNDUP(str_len);
                buf += str_len / sizeof (long);
                aup->aup_uid = IXDR_GET_LONG(buf);
                aup->aup_gid = IXDR_GET_LONG(buf);
                gid_len = IXDR_GET_U_LONG(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] = IXDR_GET_LONG(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) {
                        (void) printf("bad auth_len gid %d str %d auth %d\n",
                            gid_len, str_len, auth_len);
                        stat = AUTH_BADCRED;
                        goto done;
                }
        } else if (! xdr_authunix_parms(&xdrs, aup)) {
                xdrs.x_op = XDR_FREE;
                (void)xdr_authunix_parms(&xdrs, aup);
                stat = AUTH_BADCRED;
                goto done;
        }
        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(rqst, msg)
        struct svc_req *rqst;
        struct rpc_msg *msg;
{
        return (AUTH_REJECTEDCRED);
}