The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/fs/nfsclient/nfs_clkrpc.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1989, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * This code is derived from software contributed to Berkeley by
    8  * Rick Macklem at The University of Guelph.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  */
   35 
   36 #include <sys/cdefs.h>
   37 __FBSDID("$FreeBSD: head/sys/fs/nfsclient/nfs_clkrpc.c 326023 2017-11-20 19:43:44Z pfg $");
   38 
   39 #include "opt_kgssapi.h"
   40 
   41 #include <fs/nfs/nfsport.h>
   42 
   43 #include <rpc/rpc.h>
   44 #include <rpc/rpcsec_gss.h>
   45 #include <rpc/replay.h>
   46 
   47 
   48 NFSDLOCKMUTEX;
   49 
   50 extern SVCPOOL  *nfscbd_pool;
   51 
   52 static int nfs_cbproc(struct nfsrv_descript *, u_int32_t);
   53 
   54 extern u_long sb_max_adj;
   55 extern int nfs_numnfscbd;
   56 extern int nfscl_debuglevel;
   57 
   58 /*
   59  * NFS client system calls for handling callbacks.
   60  */
   61 
   62 /*
   63  * Handles server to client callbacks.
   64  */
   65 static void
   66 nfscb_program(struct svc_req *rqst, SVCXPRT *xprt)
   67 {
   68         struct nfsrv_descript nd;
   69         int cacherep, credflavor;
   70 
   71         memset(&nd, 0, sizeof(nd));
   72         if (rqst->rq_proc != NFSPROC_NULL &&
   73             rqst->rq_proc != NFSV4PROC_CBCOMPOUND) {
   74                 svcerr_noproc(rqst);
   75                 svc_freereq(rqst);
   76                 return;
   77         }
   78         nd.nd_procnum = rqst->rq_proc;
   79         nd.nd_flag = (ND_NFSCB | ND_NFSV4);
   80 
   81         /*
   82          * Note: we want rq_addr, not svc_getrpccaller for nd_nam2 -
   83          * NFS_SRVMAXDATA uses a NULL value for nd_nam2 to detect TCP
   84          * mounts.
   85          */
   86         nd.nd_mrep = rqst->rq_args;
   87         rqst->rq_args = NULL;
   88         newnfs_realign(&nd.nd_mrep, M_WAITOK);
   89         nd.nd_md = nd.nd_mrep;
   90         nd.nd_dpos = mtod(nd.nd_md, caddr_t);
   91         nd.nd_nam = svc_getrpccaller(rqst);
   92         nd.nd_nam2 = rqst->rq_addr;
   93         nd.nd_mreq = NULL;
   94         nd.nd_cred = NULL;
   95 
   96         NFSCL_DEBUG(1, "cbproc=%d\n",nd.nd_procnum);
   97         if (nd.nd_procnum != NFSPROC_NULL) {
   98                 if (!svc_getcred(rqst, &nd.nd_cred, &credflavor)) {
   99                         svcerr_weakauth(rqst);
  100                         svc_freereq(rqst);
  101                         m_freem(nd.nd_mrep);
  102                         return;
  103                 }
  104 
  105                 /* For now, I don't care what credential flavor was used. */
  106 #ifdef notyet
  107 #ifdef MAC
  108                 mac_cred_associate_nfsd(nd.nd_cred);
  109 #endif
  110 #endif
  111                 cacherep = nfs_cbproc(&nd, rqst->rq_xid);
  112         } else {
  113                 NFSMGET(nd.nd_mreq);
  114                 nd.nd_mreq->m_len = 0;
  115                 cacherep = RC_REPLY;
  116         }
  117         if (nd.nd_mrep != NULL)
  118                 m_freem(nd.nd_mrep);
  119 
  120         if (nd.nd_cred != NULL)
  121                 crfree(nd.nd_cred);
  122 
  123         if (cacherep == RC_DROPIT) {
  124                 if (nd.nd_mreq != NULL)
  125                         m_freem(nd.nd_mreq);
  126                 svc_freereq(rqst);
  127                 return;
  128         }
  129 
  130         if (nd.nd_mreq == NULL) {
  131                 svcerr_decode(rqst);
  132                 svc_freereq(rqst);
  133                 return;
  134         }
  135 
  136         if (nd.nd_repstat & NFSERR_AUTHERR) {
  137                 svcerr_auth(rqst, nd.nd_repstat & ~NFSERR_AUTHERR);
  138                 if (nd.nd_mreq != NULL)
  139                         m_freem(nd.nd_mreq);
  140         } else if (!svc_sendreply_mbuf(rqst, nd.nd_mreq))
  141                 svcerr_systemerr(rqst);
  142         else
  143                 NFSCL_DEBUG(1, "cbrep sent\n");
  144         svc_freereq(rqst);
  145 }
  146 
  147 /*
  148  * Check the cache and, optionally, do the RPC.
  149  * Return the appropriate cache response.
  150  */
  151 static int
  152 nfs_cbproc(struct nfsrv_descript *nd, u_int32_t xid)
  153 {
  154         struct thread *td = curthread;
  155         int cacherep;
  156 
  157         if (nd->nd_nam2 == NULL)
  158                 nd->nd_flag |= ND_STREAMSOCK;
  159 
  160         nfscl_docb(nd, td);
  161         if (nd->nd_repstat == NFSERR_DONTREPLY)
  162                 cacherep = RC_DROPIT;
  163         else
  164                 cacherep = RC_REPLY;
  165         return (cacherep);
  166 }
  167 
  168 /*
  169  * Adds a socket to the list for servicing by nfscbds.
  170  */
  171 int
  172 nfscbd_addsock(struct file *fp)
  173 {
  174         int siz;
  175         struct socket *so;
  176         int error;
  177         SVCXPRT *xprt;
  178 
  179         so = fp->f_data;
  180 
  181         siz = sb_max_adj;
  182         error = soreserve(so, siz, siz);
  183         if (error)
  184                 return (error);
  185 
  186         /*
  187          * Steal the socket from userland so that it doesn't close
  188          * unexpectedly.
  189          */
  190         if (so->so_type == SOCK_DGRAM)
  191                 xprt = svc_dg_create(nfscbd_pool, so, 0, 0);
  192         else
  193                 xprt = svc_vc_create(nfscbd_pool, so, 0, 0);
  194         if (xprt) {
  195                 fp->f_ops = &badfileops;
  196                 fp->f_data = NULL;
  197                 svc_reg(xprt, NFS_CALLBCKPROG, NFSV4_CBVERS, nfscb_program,
  198                     NULL);
  199                 SVC_RELEASE(xprt);
  200         }
  201 
  202         return (0);
  203 }
  204 
  205 /*
  206  * Called by nfssvc() for nfscbds. Just loops around servicing rpc requests
  207  * until it is killed by a signal.
  208  *
  209  * For now, only support callbacks via RPCSEC_GSS if there is a KerberosV
  210  * keytab entry with a host based entry in it on the client. (I'm not even
  211  * sure that getting Acceptor credentials for a user principal with a
  212  * credentials cache is possible, but even if it is, major changes to the
  213  * kgssapi would be required.)
  214  * I don't believe that this is a serious limitation since, as of 2009, most
  215  * NFSv4 servers supporting callbacks are using AUTH_SYS for callbacks even
  216  * when the client is using RPCSEC_GSS. (This BSD server uses AUTH_SYS
  217  * for callbacks unless nfsrv_gsscallbackson is set non-zero.)
  218  */
  219 int
  220 nfscbd_nfsd(struct thread *td, struct nfsd_nfscbd_args *args)
  221 {
  222         char principal[128];
  223         int error;
  224 
  225         if (args != NULL) {
  226                 error = copyinstr(args->principal, principal,
  227                     sizeof(principal), NULL);
  228                 if (error)
  229                         return (error);
  230         } else {
  231                 principal[0] = '\0';
  232         }
  233 
  234         /*
  235          * Only the first nfsd actually does any work. The RPC code
  236          * adds threads to it as needed. Any extra processes offered
  237          * by nfsd just exit. If nfsd is new enough, it will call us
  238          * once with a structure that specifies how many threads to
  239          * use.
  240          */
  241         NFSD_LOCK();
  242         if (nfs_numnfscbd == 0) {
  243                 nfs_numnfscbd++;
  244 
  245                 NFSD_UNLOCK();
  246 
  247                 if (principal[0] != '\0')
  248                         rpc_gss_set_svc_name_call(principal, "kerberosv5",
  249                             GSS_C_INDEFINITE, NFS_CALLBCKPROG, NFSV4_CBVERS);
  250 
  251                 nfscbd_pool->sp_minthreads = 4;
  252                 nfscbd_pool->sp_maxthreads = 4;
  253                         
  254                 svc_run(nfscbd_pool);
  255 
  256                 rpc_gss_clear_svc_name_call(NFS_CALLBCKPROG, NFSV4_CBVERS);
  257 
  258                 NFSD_LOCK();
  259                 nfs_numnfscbd--;
  260                 nfsrvd_cbinit(1);
  261         }
  262         NFSD_UNLOCK();
  263 
  264         return (0);
  265 }
  266 
  267 /*
  268  * Initialize the data structures for the server.
  269  * Handshake with any new nfsds starting up to avoid any chance of
  270  * corruption.
  271  */
  272 void
  273 nfsrvd_cbinit(int terminating)
  274 {
  275 
  276         NFSD_LOCK_ASSERT();
  277 
  278         if (terminating) {
  279                 /* Wait for any xprt registrations to complete. */
  280                 while (nfs_numnfscbd > 0)
  281                         msleep(&nfs_numnfscbd, NFSDLOCKMUTEXPTR, PZERO, 
  282                             "nfscbdt", 0);
  283                 if (nfscbd_pool != NULL) {
  284                         NFSD_UNLOCK();
  285                         svcpool_close(nfscbd_pool);
  286                         NFSD_LOCK();
  287                 }
  288         }
  289 
  290         if (nfscbd_pool == NULL) {
  291                 NFSD_UNLOCK();
  292                 nfscbd_pool = svcpool_create("nfscbd", NULL);
  293                 nfscbd_pool->sp_rcache = NULL;
  294                 nfscbd_pool->sp_assign = NULL;
  295                 nfscbd_pool->sp_done = NULL;
  296                 NFSD_LOCK();
  297         }
  298 }
  299 

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