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/*
* svc_auth.c, Server-side rpc authenticator interface.
*
* Copyright (c) 2010, Oracle America, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
* * Neither the name of the "Oracle America, Inc." nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <rpc/rpc.h>
#include <rpc/svc.h>
#include <rpc/svc_auth.h>
#include <shlib-compat.h>
/*
* svcauthsw is the bdevsw of server side authentication.
*
* Server side authenticators are called from authenticate by
* using the client auth struct flavor field to index into svcauthsw.
* The server auth flavors must implement a routine that looks
* like:
*
* enum auth_stat
* flavorx_auth(rqst, msg)
* register struct svc_req *rqst;
* register struct rpc_msg *msg;
*
*/
static enum auth_stat _svcauth_null (struct svc_req *, struct rpc_msg *);
/* no authentication */
extern enum auth_stat _svcauth_unix (struct svc_req *, struct rpc_msg *);
/* unix style (uid, gids) */
extern enum auth_stat _svcauth_short (struct svc_req *, struct rpc_msg *);
/* short hand unix style */
extern enum auth_stat _svcauth_des (struct svc_req *, struct rpc_msg *);
/* des style */
static const struct
{
enum auth_stat (*authenticator) (struct svc_req *, struct rpc_msg *);
}
svcauthsw[] =
{
{ _svcauth_null }, /* AUTH_NULL */
{ _svcauth_unix }, /* AUTH_UNIX */
{ _svcauth_short }, /* AUTH_SHORT */
{ _svcauth_des } /* AUTH_DES */
};
#define AUTH_MAX 3 /* HIGHEST AUTH NUMBER */
/*
* The call rpc message, msg has been obtained from the wire. The msg contains
* the raw form of credentials and verifiers. authenticate returns AUTH_OK
* if the msg is successfully authenticated. If AUTH_OK then the routine also
* does the following things:
* set rqst->rq_xprt->verf to the appropriate response verifier;
* sets rqst->rq_client_cred to the "cooked" form of the credentials.
*
* NB: rqst->rq_cxprt->verf must be pre-allocated;
* its length is set appropriately.
*
* The caller still owns and is responsible for msg->u.cmb.cred and
* msg->u.cmb.verf. The authentication system retains ownership of
* rqst->rq_client_cred, the cooked credentials.
*
* There is an assumption that any flavour less than AUTH_NULL is
* invalid.
*/
enum auth_stat
_authenticate (register struct svc_req *rqst, struct rpc_msg *msg)
{
register int cred_flavor;
rqst->rq_cred = msg->rm_call.cb_cred;
rqst->rq_xprt->xp_verf.oa_flavor = _null_auth.oa_flavor;
rqst->rq_xprt->xp_verf.oa_length = 0;
cred_flavor = rqst->rq_cred.oa_flavor;
if ((cred_flavor <= AUTH_MAX) && (cred_flavor >= AUTH_NULL))
return (*(svcauthsw[cred_flavor].authenticator)) (rqst, msg);
return AUTH_REJECTEDCRED;
}
libc_hidden_nolink_sunrpc (_authenticate, GLIBC_2_1)
static enum auth_stat
_svcauth_null (struct svc_req *rqst, struct rpc_msg *msg)
{
return AUTH_OK;
}
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