Svc_auth_unix.c

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/* @(#)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
 */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#ifdef _SOLARIS
#include "solaris_port.h"
#endif

#include "log.h"

/*
 * 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 <string.h>
#include "rpcal.h"

extern SVCAUTH Svc_auth_none;

/*
 * Unix longhand authenticator
 */
enum auth_stat
Gssrpc__svcauth_unix(register struct svc_req *rqst,
                     register struct rpc_msg *msg, bool_t * dispatch)
{
  register enum auth_stat stat;
  XDR xdrs;
  register struct authunix_parms *aup;
  register rpc_inline_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;
  int str_len, gid_len;
  register int i;

  rqst->rq_xprt->xp_auth = &Svc_auth_none;

  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, (int)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, (u_int) str_len);
      aup->aup_machname[str_len] = 0;
      str_len = RNDUP(str_len);
      buf += str_len / BYTES_PER_XDR_UNIT;
      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 > (int)auth_len)
        {
          LogCrit(COMPONENT_DISPATCH, "bad auth_len gid %d str %d auth %d",
                  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(struct svc_req *rqst, struct rpc_msg *msg, bool_t * dispatch)
{
  rqst->rq_xprt->xp_auth = &Svc_auth_none;
  return (AUTH_REJECTEDCRED);
}