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/*
* 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) 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 <stdio.h>
#include <string.h>
#include <rpc/rpc.h>
#include <rpc/svc.h>
/*
* Unix longhand authenticator
*/
enum auth_stat
_svcauth_unix (struct svc_req *rqst, struct rpc_msg *msg)
{
enum auth_stat stat;
XDR xdrs;
struct authunix_parms *aup;
int32_t *buf;
struct area
{
struct authunix_parms area_aup;
char area_machname[MAX_MACHINE_NAME + 1];
gid_t area_gids[NGRPS];
}
*area;
u_int auth_len;
u_int str_len, gid_len;
u_int i;
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, auth_len);
if (buf != NULL)
{
aup->aup_time = IXDR_GET_LONG (buf);
str_len = IXDR_GET_U_INT32 (buf);
if (str_len > MAX_MACHINE_NAME)
{
stat = AUTH_BADCRED;
goto done;
}
memcpy (aup->aup_machname, (caddr_t) buf, (u_int) str_len);
aup->aup_machname[str_len] = 0;
str_len = RNDUP (str_len);
buf = (int32_t *) ((char *) buf + str_len);
aup->aup_uid = IXDR_GET_LONG (buf);
aup->aup_gid = IXDR_GET_LONG (buf);
gid_len = IXDR_GET_U_INT32 (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)
{
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;
}
/* get the verifier */
if ((u_int)msg->rm_call.cb_verf.oa_length)
{
rqst->rq_xprt->xp_verf.oa_flavor =
msg->rm_call.cb_verf.oa_flavor;
rqst->rq_xprt->xp_verf.oa_base =
msg->rm_call.cb_verf.oa_base;
rqst->rq_xprt->xp_verf.oa_length =
msg->rm_call.cb_verf.oa_length;
}
else
{
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
_svcauth_short (struct svc_req *rqst, struct rpc_msg *msg)
{
return AUTH_REJECTEDCRED;
}
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