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svc_auth_unix.c revision 1.2 
      1 /*
      2  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
      3  * unrestricted use provided that this legend is included on all tape
      4  * media and as a part of the software program in whole or part.  Users
      5  * may copy or modify Sun RPC without charge, but are not authorized
      6  * to license or distribute it to anyone else except as part of a product or
      7  * program developed by the user.
      8  *
      9  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
     10  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
     11  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
     12  *
     13  * Sun RPC is provided with no support and without any obligation on the
     14  * part of Sun Microsystems, Inc. to assist in its use, correction,
     15  * modification or enhancement.
     16  *
     17  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
     18  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
     19  * OR ANY PART THEREOF.
     20  *
     21  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
     22  * or profits or other special, indirect and consequential damages, even if
     23  * Sun has been advised of the possibility of such damages.
     24  *
     25  * Sun Microsystems, Inc.
     26  * 2550 Garcia Avenue
     27  * Mountain View, California  94043
     28  */
     29 
     30 #if defined(LIBC_SCCS) && !defined(lint)
     31 /*static char *sccsid = "from: @(#)svc_auth_unix.c 1.28 88/02/08 Copyr 1984 Sun Micro";*/
     32 /*static char *sccsid = "from: @(#)svc_auth_unix.c	2.3 88/08/01 4.0 RPCSRC";*/
     33 static char *rcsid = "$Id: svc_auth_unix.c,v 1.2 1994/12/04 01:13:24 cgd Exp $";
     34 #endif
     35 
     36 /*
     37  * svc_auth_unix.c
     38  * Handles UNIX flavor authentication parameters on the service side of rpc.
     39  * There are two svc auth implementations here: AUTH_UNIX and AUTH_SHORT.
     40  * _svcauth_unix does full blown unix style uid,gid+gids auth,
     41  * _svcauth_short uses a shorthand auth to index into a cache of longhand auths.
     42  * Note: the shorthand has been gutted for efficiency.
     43  *
     44  * Copyright (C) 1984, Sun Microsystems, Inc.
     45  */
     46 
     47 #include <stdio.h>
     48 #include <rpc/rpc.h>
     49 
     50 /*
     51  * Unix longhand authenticator
     52  */
     53 enum auth_stat
     54 _svcauth_unix(rqst, msg)
     55 	register struct svc_req *rqst;
     56 	register struct rpc_msg *msg;
     57 {
     58 	register enum auth_stat stat;
     59 	XDR xdrs;
     60 	register struct authunix_parms *aup;
     61 	register int32_t *buf;
     62 	struct area {
     63 		struct authunix_parms area_aup;
     64 		char area_machname[MAX_MACHINE_NAME+1];
     65 		int area_gids[NGRPS];
     66 	} *area;
     67 	u_int auth_len;
     68 	int str_len, gid_len;
     69 	register int i;
     70 
     71 	area = (struct area *) rqst->rq_clntcred;
     72 	aup = &area->area_aup;
     73 	aup->aup_machname = area->area_machname;
     74 	aup->aup_gids = area->area_gids;
     75 	auth_len = (u_int)msg->rm_call.cb_cred.oa_length;
     76 	xdrmem_create(&xdrs, msg->rm_call.cb_cred.oa_base, auth_len,XDR_DECODE);
     77 	buf = XDR_INLINE(&xdrs, auth_len);
     78 	if (buf != NULL) {
     79 		aup->aup_time = IXDR_GET_LONG(buf);
     80 		str_len = IXDR_GET_U_LONG(buf);
     81 		if (str_len > MAX_MACHINE_NAME) {
     82 			stat = AUTH_BADCRED;
     83 			goto done;
     84 		}
     85 		bcopy((caddr_t)buf, aup->aup_machname, (u_int)str_len);
     86 		aup->aup_machname[str_len] = 0;
     87 		str_len = RNDUP(str_len);
     88 		buf += str_len / sizeof (int32_t);
     89 		aup->aup_uid = IXDR_GET_LONG(buf);
     90 		aup->aup_gid = IXDR_GET_LONG(buf);
     91 		gid_len = IXDR_GET_U_LONG(buf);
     92 		if (gid_len > NGRPS) {
     93 			stat = AUTH_BADCRED;
     94 			goto done;
     95 		}
     96 		aup->aup_len = gid_len;
     97 		for (i = 0; i < gid_len; i++) {
     98 			aup->aup_gids[i] = IXDR_GET_LONG(buf);
     99 		}
    100 		/*
    101 		 * five is the smallest unix credentials structure -
    102 		 * timestamp, hostname len (0), uid, gid, and gids len (0).
    103 		 */
    104 		if ((5 + gid_len) * BYTES_PER_XDR_UNIT + str_len > auth_len) {
    105 			(void) printf("bad auth_len gid %d str %d auth %d\n",
    106 			    gid_len, str_len, auth_len);
    107 			stat = AUTH_BADCRED;
    108 			goto done;
    109 		}
    110 	} else if (! xdr_authunix_parms(&xdrs, aup)) {
    111 		xdrs.x_op = XDR_FREE;
    112 		(void)xdr_authunix_parms(&xdrs, aup);
    113 		stat = AUTH_BADCRED;
    114 		goto done;
    115 	}
    116 	rqst->rq_xprt->xp_verf.oa_flavor = AUTH_NULL;
    117 	rqst->rq_xprt->xp_verf.oa_length = 0;
    118 	stat = AUTH_OK;
    119 done:
    120 	XDR_DESTROY(&xdrs);
    121 	return (stat);
    122 }
    123 
    124 
    125 /*
    126  * Shorthand unix authenticator
    127  * Looks up longhand in a cache.
    128  */
    129 /*ARGSUSED*/
    130 enum auth_stat
    131 _svcauth_short(rqst, msg)
    132 	struct svc_req *rqst;
    133 	struct rpc_msg *msg;
    134 {
    135 	return (AUTH_REJECTEDCRED);
    136 }
    137