sunrpc/svc_auth.c

   1 /* @(#)svc_auth.c       2.4 88/08/15 4.0 RPCSRC */
   2 /*
   3  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   4  * unrestricted use provided that this legend is included on all tape
   5  * media and as a part of the software program in whole or part.  Users
   6  * may copy or modify Sun RPC without charge, but are not authorized
   7  * to license or distribute it to anyone else except as part of a product or
   8  * program developed by the user.
   9  *
  10  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  11  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  12  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  13  *
  14  * Sun RPC is provided with no support and without any obligation on the
  15  * part of Sun Microsystems, Inc. to assist in its use, correction,
  16  * modification or enhancement.
  17  *
  18  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  19  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  20  * OR ANY PART THEREOF.
  21  *
  22  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  23  * or profits or other special, indirect and consequential damages, even if
  24  * Sun has been advised of the possibility of such damages.
  25  *
  26  * Sun Microsystems, Inc.
  27  * 2550 Garcia Avenue
  28  * Mountain View, California  94043
  29  */
  30 #if !defined(lint) && defined(SCCSIDS)
  31 static char sccsid[] = "@(#)svc_auth.c 1.19 87/08/11 Copyr 1984 Sun Micro";
  32 #endif
  33
  34 /*
  35  * svc_auth.c, Server-side rpc authenticator interface.
  36  *
  37  * Copyright (C) 1984, Sun Microsystems, Inc.
  38  */
  39
  40 #include <rpc/rpc.h>
  41 #include <rpc/svc.h>
  42 #include <rpc/svc_auth.h>
  43
  44 /*
  45  * svcauthsw is the bdevsw of server side authentication.
  46  *
  47  * Server side authenticators are called from authenticate by
  48  * using the client auth struct flavor field to index into svcauthsw.
  49  * The server auth flavors must implement a routine that looks
  50  * like:
  51  *
  52  *      enum auth_stat
  53  *      flavorx_auth(rqst, msg)
  54  *              register struct svc_req *rqst;
  55  *              register struct rpc_msg *msg;
  56  *
  57  */
  58
  59 static enum auth_stat _svcauth_null (struct svc_req *, struct rpc_msg *);
  60                                 /* no authentication */
  61 extern enum auth_stat _svcauth_unix (struct svc_req *, struct rpc_msg *);
  62                                 /* unix style (uid, gids) */
  63 extern enum auth_stat _svcauth_short (struct svc_req *, struct rpc_msg *);
  64                                 /* short hand unix style */
  65 extern enum auth_stat _svcauth_des (struct svc_req *, struct rpc_msg *);
  66                                 /* des style */
  67
  68 static const struct
  69   {
  70     enum auth_stat (*authenticator) (struct svc_req *, struct rpc_msg *);
  71   }
  72 svcauthsw[] =
  73 {
  74   { _svcauth_null },            /* AUTH_NULL */
  75   { _svcauth_unix },            /* AUTH_UNIX */
  76   { _svcauth_short },           /* AUTH_SHORT */
  77   { _svcauth_des }              /* AUTH_DES */
  78 };
  79 #define AUTH_MAX        3       /* HIGHEST AUTH NUMBER */
  80
  81
  82 /*
  83  * The call rpc message, msg has been obtained from the wire.  The msg contains
  84  * the raw form of credentials and verifiers.  authenticate returns AUTH_OK
  85  * if the msg is successfully authenticated.  If AUTH_OK then the routine also
  86  * does the following things:
  87  * set rqst->rq_xprt->verf to the appropriate response verifier;
  88  * sets rqst->rq_client_cred to the "cooked" form of the credentials.
  89  *
  90  * NB: rqst->rq_cxprt->verf must be pre-allocated;
  91  * its length is set appropriately.
  92  *
  93  * The caller still owns and is responsible for msg->u.cmb.cred and
  94  * msg->u.cmb.verf.  The authentication system retains ownership of
  95  * rqst->rq_client_cred, the cooked credentials.
  96  *
  97  * There is an assumption that any flavour less than AUTH_NULL is
  98  * invalid.
  99  */
 100 enum auth_stat
 101 _authenticate (register struct svc_req *rqst, struct rpc_msg *msg)
 102 {
 103   register int cred_flavor;
 104
 105   rqst->rq_cred = msg->rm_call.cb_cred;
 106   rqst->rq_xprt->xp_verf.oa_flavor = _null_auth.oa_flavor;
 107   rqst->rq_xprt->xp_verf.oa_length = 0;
 108   cred_flavor = rqst->rq_cred.oa_flavor;
 109   if ((cred_flavor <= AUTH_MAX) && (cred_flavor >= AUTH_NULL))
 110     return (*(svcauthsw[cred_flavor].authenticator)) (rqst, msg);
 111
 112   return AUTH_REJECTEDCRED;
 113 }
 114
 115 static enum auth_stat
 116 _svcauth_null (struct svc_req *rqst, struct rpc_msg *msg)
 117 {
 118   return AUTH_OK;
 119 }