#include <machine/rtems-bsd-kernel-space.h>
/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Rick Macklem at The University of Guelph.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the name of the University 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 REGENTS 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 REGENTS 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 <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <rtems/bsd/local/opt_kgssapi.h>
#include <fs/nfs/nfsport.h>
#include <rpc/rpc.h>
#include <rpc/rpcsec_gss.h>
#include <rpc/replay.h>
NFSDLOCKMUTEX;
extern SVCPOOL *nfscbd_pool;
static int nfs_cbproc(struct nfsrv_descript *, u_int32_t);
extern u_long sb_max_adj;
extern int nfs_numnfscbd;
extern int nfscl_debuglevel;
/*
* NFS client system calls for handling callbacks.
*/
/*
* Handles server to client callbacks.
*/
static void
nfscb_program(struct svc_req *rqst, SVCXPRT *xprt)
{
struct nfsrv_descript nd;
int cacherep, credflavor;
memset(&nd, 0, sizeof(nd));
if (rqst->rq_proc != NFSPROC_NULL &&
rqst->rq_proc != NFSV4PROC_CBCOMPOUND) {
svcerr_noproc(rqst);
svc_freereq(rqst);
return;
}
nd.nd_procnum = rqst->rq_proc;
nd.nd_flag = (ND_NFSCB | ND_NFSV4);
/*
* Note: we want rq_addr, not svc_getrpccaller for nd_nam2 -
* NFS_SRVMAXDATA uses a NULL value for nd_nam2 to detect TCP
* mounts.
*/
nd.nd_mrep = rqst->rq_args;
rqst->rq_args = NULL;
newnfs_realign(&nd.nd_mrep, M_WAITOK);
nd.nd_md = nd.nd_mrep;
nd.nd_dpos = mtod(nd.nd_md, caddr_t);
nd.nd_nam = svc_getrpccaller(rqst);
nd.nd_nam2 = rqst->rq_addr;
nd.nd_mreq = NULL;
nd.nd_cred = NULL;
NFSCL_DEBUG(1, "cbproc=%d\n",nd.nd_procnum);
if (nd.nd_procnum != NFSPROC_NULL) {
if (!svc_getcred(rqst, &nd.nd_cred, &credflavor)) {
svcerr_weakauth(rqst);
svc_freereq(rqst);
m_freem(nd.nd_mrep);
return;
}
/* For now, I don't care what credential flavor was used. */
#ifdef notyet
#ifdef MAC
mac_cred_associate_nfsd(nd.nd_cred);
#endif
#endif
cacherep = nfs_cbproc(&nd, rqst->rq_xid);
} else {
NFSMGET(nd.nd_mreq);
nd.nd_mreq->m_len = 0;
cacherep = RC_REPLY;
}
if (nd.nd_mrep != NULL)
m_freem(nd.nd_mrep);
if (nd.nd_cred != NULL)
crfree(nd.nd_cred);
if (cacherep == RC_DROPIT) {
if (nd.nd_mreq != NULL)
m_freem(nd.nd_mreq);
svc_freereq(rqst);
return;
}
if (nd.nd_mreq == NULL) {
svcerr_decode(rqst);
svc_freereq(rqst);
return;
}
if (nd.nd_repstat & NFSERR_AUTHERR) {
svcerr_auth(rqst, nd.nd_repstat & ~NFSERR_AUTHERR);
if (nd.nd_mreq != NULL)
m_freem(nd.nd_mreq);
} else if (!svc_sendreply_mbuf(rqst, nd.nd_mreq))
svcerr_systemerr(rqst);
else
NFSCL_DEBUG(1, "cbrep sent\n");
svc_freereq(rqst);
}
/*
* Check the cache and, optionally, do the RPC.
* Return the appropriate cache response.
*/
static int
nfs_cbproc(struct nfsrv_descript *nd, u_int32_t xid)
{
struct thread *td = curthread;
int cacherep;
if (nd->nd_nam2 == NULL)
nd->nd_flag |= ND_STREAMSOCK;
nfscl_docb(nd, td);
if (nd->nd_repstat == NFSERR_DONTREPLY)
cacherep = RC_DROPIT;
else
cacherep = RC_REPLY;
return (cacherep);
}
/*
* Adds a socket to the list for servicing by nfscbds.
*/
int
nfscbd_addsock(struct file *fp)
{
int siz;
struct socket *so;
int error;
SVCXPRT *xprt;
so = fp->f_data;
siz = sb_max_adj;
error = soreserve(so, siz, siz);
if (error)
return (error);
/*
* Steal the socket from userland so that it doesn't close
* unexpectedly.
*/
if (so->so_type == SOCK_DGRAM)
xprt = svc_dg_create(nfscbd_pool, so, 0, 0);
else
xprt = svc_vc_create(nfscbd_pool, so, 0, 0);
if (xprt) {
fp->f_ops = &badfileops;
fp->f_data = NULL;
svc_reg(xprt, NFS_CALLBCKPROG, NFSV4_CBVERS, nfscb_program,
NULL);
SVC_RELEASE(xprt);
}
return (0);
}
/*
* Called by nfssvc() for nfscbds. Just loops around servicing rpc requests
* until it is killed by a signal.
*
* For now, only support callbacks via RPCSEC_GSS if there is a KerberosV
* keytab entry with a host based entry in it on the client. (I'm not even
* sure that getting Acceptor credentials for a user principal with a
* credentials cache is possible, but even if it is, major changes to the
* kgssapi would be required.)
* I don't believe that this is a serious limitation since, as of 2009, most
* NFSv4 servers supporting callbacks are using AUTH_SYS for callbacks even
* when the client is using RPCSEC_GSS. (This BSD server uses AUTH_SYS
* for callbacks unless nfsrv_gsscallbackson is set non-zero.)
*/
int
nfscbd_nfsd(struct thread *td, struct nfsd_nfscbd_args *args)
{
char principal[128];
int error;
if (args != NULL) {
error = copyinstr(args->principal, principal,
sizeof(principal), NULL);
if (error)
return (error);
} else {
principal[0] = '\0';
}
/*
* Only the first nfsd actually does any work. The RPC code
* adds threads to it as needed. Any extra processes offered
* by nfsd just exit. If nfsd is new enough, it will call us
* once with a structure that specifies how many threads to
* use.
*/
NFSD_LOCK();
if (nfs_numnfscbd == 0) {
nfs_numnfscbd++;
NFSD_UNLOCK();
if (principal[0] != '\0')
rpc_gss_set_svc_name_call(principal, "kerberosv5",
GSS_C_INDEFINITE, NFS_CALLBCKPROG, NFSV4_CBVERS);
nfscbd_pool->sp_minthreads = 4;
nfscbd_pool->sp_maxthreads = 4;
svc_run(nfscbd_pool);
rpc_gss_clear_svc_name_call(NFS_CALLBCKPROG, NFSV4_CBVERS);
NFSD_LOCK();
nfs_numnfscbd--;
nfsrvd_cbinit(1);
}
NFSD_UNLOCK();
return (0);
}
/*
* Initialize the data structures for the server.
* Handshake with any new nfsds starting up to avoid any chance of
* corruption.
*/
void
nfsrvd_cbinit(int terminating)
{
NFSD_LOCK_ASSERT();
if (terminating) {
/* Wait for any xprt registrations to complete. */
while (nfs_numnfscbd > 0)
msleep(&nfs_numnfscbd, NFSDLOCKMUTEXPTR, PZERO,
"nfscbdt", 0);
if (nfscbd_pool != NULL) {
NFSD_UNLOCK();
svcpool_close(nfscbd_pool);
NFSD_LOCK();
}
}
if (nfscbd_pool == NULL) {
NFSD_UNLOCK();
nfscbd_pool = svcpool_create("nfscbd", NULL);
nfscbd_pool->sp_rcache = NULL;
nfscbd_pool->sp_assign = NULL;
nfscbd_pool->sp_done = NULL;
NFSD_LOCK();
}
}
