/*
* nfsauth4_access is used for NFS V4 auth checking. Besides doing
* the common nfsauth_access(), it will check if the client can
* have a limited access to this vnode even if the security flavor
* used does not meet the policy.
*/
int
nfsauth4_access(struct exportinfo *exi, vnode_t *vp, struct svc_req *req)
{
int access;
access = nfsauth_access(exi, req);
/*
* There are cases that the server needs to allow the client
* to have a limited view.
*
* e.g.
* /export is shared as "sec=sys,rw=dfs-test-4,sec=krb5,rw"
* /export/home is shared as "sec=sys,rw"
*
* When the client mounts /export with sec=sys, the client
* would get a limited view with RO access on /export to see
* "home" only because the client is allowed to access
* /export/home with auth_sys.
*/
if (access & NFSAUTH_DENIED || access & NFSAUTH_WRONGSEC) {
/*
* Allow ro permission with LIMITED view if there is a
* sub-dir exported under vp.
*/
if (has_visible(exi, vp))
return (NFSAUTH_LIMITED);
}
return (access);
}
void
nfsauth_func(void *cookie, char *dataptr, size_t arg_size,
door_desc_t *dp, uint_t n_desc)
{
nfsauth_arg_t *ap;
nfsauth_res_t res = {0};
nfsauth_res_t *rp = &res;
XDR xdrs_a;
XDR xdrs_r;
caddr_t abuf = dataptr;
size_t absz = arg_size;
size_t rbsz = (size_t)(BYTES_PER_XDR_UNIT * 2);
char result[BYTES_PER_XDR_UNIT * 2];
caddr_t rbuf = (caddr_t)&result;
varg_t varg = {0};
/*
* Decode the inbound door data, so we can look at the cmd.
*/
xdrmem_create(&xdrs_a, abuf, absz, XDR_DECODE);
if (!xdr_varg(&xdrs_a, &varg)) {
/*
* If the arguments can't be decoded, bail.
*/
if (varg.vers == V_ERROR)
syslog(LOG_ERR, gettext("Arg version mismatch"));
res.stat = NFSAUTH_DR_DECERR;
goto encres;
}
/*
* Now set the args pointer to the proper version of the args
*/
switch (varg.vers) {
case V_PROTO:
ap = &varg.arg_u.arg;
break;
/* Additional arguments versions go here */
default:
syslog(LOG_ERR, gettext("Invalid args version"));
goto encres;
}
/*
* Call the specified cmd
*/
switch (ap->cmd) {
case NFSAUTH_ACCESS:
nfsauth_access(&ap->areq, &rp->ares);
rp->stat = NFSAUTH_DR_OKAY;
break;
default:
rp->stat = NFSAUTH_DR_BADCMD;
break;
}
encres:
/*
* Free space used to decode the args
*/
xdrs_a.x_op = XDR_FREE;
(void) xdr_varg(&xdrs_a, &varg);
xdr_destroy(&xdrs_a);
/*
* Encode the results before passing thru door.
*
* The result (nfsauth_res_t) is always two int's, so we don't
* have to dynamically size (or allocate) the results buffer.
*/
xdrmem_create(&xdrs_r, rbuf, rbsz, XDR_ENCODE);
if (!xdr_nfsauth_res(&xdrs_r, rp)) {
/*
* return only the status code
*/
rp->stat = NFSAUTH_DR_EFAIL;
rbsz = sizeof (uint_t);
*rbuf = (uint_t)rp->stat;
}
xdr_destroy(&xdrs_r);
(void) door_return((char *)rbuf, rbsz, NULL, 0);
(void) door_return(NULL, 0, NULL, 0);
/* NOTREACHED */
}