298 lines
7.1 KiB
C
298 lines
7.1 KiB
C
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/*-
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Rick Macklem at The University of Guelph.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_inet6.h"
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#include "opt_kgssapi.h"
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#include <fs/nfs/nfsport.h>
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#include <rpc/rpc.h>
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#include <rpc/rpcsec_gss.h>
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#include <rpc/replay.h>
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NFSDLOCKMUTEX;
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SYSCTL_DECL(_vfs_newnfs);
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SVCPOOL *nfscbd_pool;
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static int nfs_cbproc(struct nfsrv_descript *, u_int32_t);
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extern u_long sb_max_adj;
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extern int nfs_numnfscbd;
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/*
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* NFS client system calls for handling callbacks.
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*/
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/*
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* Handles server to client callbacks.
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*/
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static void
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nfscb_program(struct svc_req *rqst, SVCXPRT *xprt)
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{
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struct nfsrv_descript nd;
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int cacherep;
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memset(&nd, 0, sizeof(nd));
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if (rqst->rq_proc != NFSPROC_NULL &&
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rqst->rq_proc != NFSV4PROC_CBCOMPOUND) {
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svcerr_noproc(rqst);
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svc_freereq(rqst);
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return;
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}
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nd.nd_procnum = rqst->rq_proc;
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nd.nd_flag = (ND_NFSCB | ND_NFSV4);
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/*
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* Note: we want rq_addr, not svc_getrpccaller for nd_nam2 -
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* NFS_SRVMAXDATA uses a NULL value for nd_nam2 to detect TCP
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* mounts.
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*/
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nd.nd_mrep = rqst->rq_args;
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rqst->rq_args = NULL;
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newnfs_realign(&nd.nd_mrep);
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nd.nd_md = nd.nd_mrep;
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nd.nd_dpos = mtod(nd.nd_md, caddr_t);
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nd.nd_nam = svc_getrpccaller(rqst);
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nd.nd_nam2 = rqst->rq_addr;
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nd.nd_mreq = NULL;
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nd.nd_cred = NULL;
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if (nd.nd_procnum != NFSPROC_NULL) {
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if (!svc_getcred(rqst, &nd.nd_cred, &nd.nd_credflavor)) {
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svcerr_weakauth(rqst);
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svc_freereq(rqst);
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m_freem(nd.nd_mrep);
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return;
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}
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#ifdef notyet
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#ifdef MAC
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mac_cred_associate_nfsd(nd.nd_cred);
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#endif
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#endif
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cacherep = nfs_cbproc(&nd, rqst->rq_xid);
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} else {
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NFSMGET(nd.nd_mreq);
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nd.nd_mreq->m_len = 0;
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cacherep = RC_REPLY;
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}
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if (nd.nd_mrep != NULL)
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m_freem(nd.nd_mrep);
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if (nd.nd_cred != NULL)
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crfree(nd.nd_cred);
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if (cacherep == RC_DROPIT) {
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if (nd.nd_mreq != NULL)
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m_freem(nd.nd_mreq);
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svc_freereq(rqst);
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return;
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}
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if (nd.nd_mreq == NULL) {
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svcerr_decode(rqst);
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svc_freereq(rqst);
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return;
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}
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if (nd.nd_repstat & NFSERR_AUTHERR) {
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svcerr_auth(rqst, nd.nd_repstat & ~NFSERR_AUTHERR);
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if (nd.nd_mreq != NULL)
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m_freem(nd.nd_mreq);
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} else if (!svc_sendreply_mbuf(rqst, nd.nd_mreq)) {
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svcerr_systemerr(rqst);
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}
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svc_freereq(rqst);
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}
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/*
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* Check the cache and, optionally, do the RPC.
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* Return the appropriate cache response.
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*/
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static int
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nfs_cbproc(struct nfsrv_descript *nd, u_int32_t xid)
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{
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struct thread *td = curthread;
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int cacherep;
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if (nd->nd_nam2 == NULL)
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nd->nd_flag |= ND_STREAMSOCK;
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nfscl_docb(nd, td);
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if (nd->nd_repstat == NFSERR_DONTREPLY)
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cacherep = RC_DROPIT;
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else
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cacherep = RC_REPLY;
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return (cacherep);
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}
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/*
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* Adds a socket to the list for servicing by nfscbds.
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*/
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int
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nfscbd_addsock(struct file *fp)
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{
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int siz;
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struct socket *so;
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int error;
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SVCXPRT *xprt;
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so = fp->f_data;
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siz = sb_max_adj;
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error = soreserve(so, siz, siz);
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if (error)
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return (error);
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/*
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* Steal the socket from userland so that it doesn't close
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* unexpectedly.
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*/
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if (so->so_type == SOCK_DGRAM)
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xprt = svc_dg_create(nfscbd_pool, so, 0, 0);
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else
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xprt = svc_vc_create(nfscbd_pool, so, 0, 0);
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if (xprt) {
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fp->f_ops = &badfileops;
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fp->f_data = NULL;
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svc_reg(xprt, NFS_CALLBCKPROG, NFSV4_CBVERS, nfscb_program,
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NULL);
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}
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return (0);
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}
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/*
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* Called by nfssvc() for nfscbds. Just loops around servicing rpc requests
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* until it is killed by a signal.
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*
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* For now, only support callbacks via RPCSEC_GSS if there is a KerberosV
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* keytab entry with a host based entry in it on the client. (I'm not even
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* sure that getting Acceptor credentials for a user principal with a
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* credentials cache is possible, but even if it is, major changes to the
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* kgssapi would be required.)
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* I don't believe that this is a serious limitation since, as of 2009, most
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* NFSv4 servers supporting callbacks are using AUTH_SYS for callbacks even
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* when the client is using RPCSEC_GSS. (This BSD server uses AUTH_SYS
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* for callbacks unless nfsrv_gsscallbackson is set non-zero.)
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*/
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int
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nfscbd_nfsd(struct thread *td, struct nfsd_nfscbd_args *args)
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{
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#ifdef KGSSAPI
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char principal[128];
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int error;
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#endif
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#ifdef KGSSAPI
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if (args != NULL) {
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error = copyinstr(args->principal, principal,
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sizeof(principal), NULL);
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if (error)
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return (error);
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} else {
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principal[0] = '\0';
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}
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#endif
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/*
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* Only the first nfsd actually does any work. The RPC code
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* adds threads to it as needed. Any extra processes offered
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* by nfsd just exit. If nfsd is new enough, it will call us
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* once with a structure that specifies how many threads to
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* use.
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*/
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NFSD_LOCK();
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if (nfs_numnfscbd == 0) {
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nfs_numnfscbd++;
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NFSD_UNLOCK();
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#ifdef KGSSAPI
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if (principal[0] != '\0')
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rpc_gss_set_svc_name(principal, "kerberosv5",
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GSS_C_INDEFINITE, NFS_CALLBCKPROG, NFSV4_CBVERS);
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#endif
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nfscbd_pool->sp_minthreads = 4;
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nfscbd_pool->sp_maxthreads = 4;
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svc_run(nfscbd_pool);
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#ifdef KGSSAPI
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rpc_gss_clear_svc_name(NFS_CALLBCKPROG, NFSV4_CBVERS);
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#endif
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NFSD_LOCK();
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nfs_numnfscbd--;
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nfsrvd_cbinit(1);
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}
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NFSD_UNLOCK();
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return (0);
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}
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/*
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* Initialize the data structures for the server.
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* Handshake with any new nfsds starting up to avoid any chance of
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* corruption.
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*/
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void
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nfsrvd_cbinit(int terminating)
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{
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NFSD_LOCK_ASSERT();
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if (terminating) {
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NFSD_UNLOCK();
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svcpool_destroy(nfscbd_pool);
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nfscbd_pool = NULL;
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NFSD_LOCK();
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}
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NFSD_UNLOCK();
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nfscbd_pool = svcpool_create("nfscbd", SYSCTL_STATIC_CHILDREN(_vfs_newnfs));
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nfscbd_pool->sp_rcache = NULL;
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nfscbd_pool->sp_assign = NULL;
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nfscbd_pool->sp_done = NULL;
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NFSD_LOCK();
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}
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