text: /* @(#)svc_auth_unix.c	2.3 88/08/01 4.0 RPCSRC; from 1.28 88/02/08 SMI */
  /*
   * 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(lint) && defined(SCCSIDS)
  static char sccsid[] = "@(#)svc_auth_unix.c 1.28 88/02/08 Copyr 1984 Sun Micro";
  #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 <gssrpc/rpc.h>
  
  /*
   * Unix longhand authenticator
   */
  enum auth_stat
  _gssrpc_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 rpc_int32 *buf;
  	struct area {
  		struct authunix_parms area_aup;
  		char area_machname[MAX_MACHINE_NAME+1];
  		int area_gids[NGRPS];
  	} *area;
  	unsigned int auth_len;
  	int str_len, gid_len;
  	register int i;
  
  	rqst->rq_xprt->xp_auth = &svc_auth_any;
  	
  	area = (struct area *) rqst->rq_clntcred;
  	aup = &area->area_aup;
  	aup->aup_machname = area->area_machname;
  	aup->aup_gids = area->area_gids;
  	auth_len = (unsigned int)msg->rm_call.cb_cred.oa_length;
  	xdrmem_create(&xdrs, msg->rm_call.cb_cred.oa_base, auth_len,XDR_DECODE);
  	buf = (rpc_int32 *) 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;
  		}
  		memmove(aup->aup_machname, (caddr_t)buf, (unsigned int)str_len);
  		aup->aup_machname[str_len] = 0;
  		str_len = RNDUP(str_len);
  		buf += str_len / sizeof (rpc_int32);
  		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 
  _gssrpc_svcauth_short(rqst, msg)
  	struct svc_req *rqst;
  	struct rpc_msg *msg;
  {
  	rqst->rq_xprt->xp_auth = &svc_auth_any;
  	return (AUTH_REJECTEDCRED);
  }
  