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  * Copyright (c) 1989, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * Rick Macklem at The University of Guelph.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 4. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  */
   33 
   34 #include <sys/cdefs.h>
   35 __FBSDID("$FreeBSD: releng/9.2/sys/fs/nfsclient/nfs_clkrpc.c 251641 2013-06-11 23:19:02Z ken $");
   36 
   37 #include "opt_kgssapi.h"
   38 
   39 #include <fs/nfs/nfsport.h>
   40 
   41 #include <rpc/rpc.h>
   42 #include <rpc/rpcsec_gss.h>
   43 #include <rpc/replay.h>
   44 
   45 
   46 NFSDLOCKMUTEX;
   47 
   48 SVCPOOL         *nfscbd_pool;
   49 
   50 static int nfs_cbproc(struct nfsrv_descript *, u_int32_t);
   51 
   52 extern u_long sb_max_adj;
   53 extern int nfs_numnfscbd;
   54 
   55 /*
   56  * NFS client system calls for handling callbacks.
   57  */
   58 
   59 /*
   60  * Handles server to client callbacks.
   61  */
   62 static void
   63 nfscb_program(struct svc_req *rqst, SVCXPRT *xprt)
   64 {
   65         struct nfsrv_descript nd;
   66         int cacherep, credflavor;
   67 
   68         memset(&nd, 0, sizeof(nd));
   69         if (rqst->rq_proc != NFSPROC_NULL &&
   70             rqst->rq_proc != NFSV4PROC_CBCOMPOUND) {
   71                 svcerr_noproc(rqst);
   72                 svc_freereq(rqst);
   73                 return;
   74         }
   75         nd.nd_procnum = rqst->rq_proc;
   76         nd.nd_flag = (ND_NFSCB | ND_NFSV4);
   77 
   78         /*
   79          * Note: we want rq_addr, not svc_getrpccaller for nd_nam2 -
   80          * NFS_SRVMAXDATA uses a NULL value for nd_nam2 to detect TCP
   81          * mounts.
   82          */
   83         nd.nd_mrep = rqst->rq_args;
   84         rqst->rq_args = NULL;
   85         newnfs_realign(&nd.nd_mrep, M_WAITOK);
   86         nd.nd_md = nd.nd_mrep;
   87         nd.nd_dpos = mtod(nd.nd_md, caddr_t);
   88         nd.nd_nam = svc_getrpccaller(rqst);
   89         nd.nd_nam2 = rqst->rq_addr;
   90         nd.nd_mreq = NULL;
   91         nd.nd_cred = NULL;
   92 
   93         if (nd.nd_procnum != NFSPROC_NULL) {
   94                 if (!svc_getcred(rqst, &nd.nd_cred, &credflavor)) {
   95                         svcerr_weakauth(rqst);
   96                         svc_freereq(rqst);
   97                         m_freem(nd.nd_mrep);
   98                         return;
   99                 }
  100 
  101                 /* For now, I don't care what credential flavor was used. */
  102 #ifdef notyet
  103 #ifdef MAC
  104                 mac_cred_associate_nfsd(nd.nd_cred);
  105 #endif
  106 #endif
  107                 cacherep = nfs_cbproc(&nd, rqst->rq_xid);
  108         } else {
  109                 NFSMGET(nd.nd_mreq);
  110                 nd.nd_mreq->m_len = 0;
  111                 cacherep = RC_REPLY;
  112         }
  113         if (nd.nd_mrep != NULL)
  114                 m_freem(nd.nd_mrep);
  115 
  116         if (nd.nd_cred != NULL)
  117                 crfree(nd.nd_cred);
  118 
  119         if (cacherep == RC_DROPIT) {
  120                 if (nd.nd_mreq != NULL)
  121                         m_freem(nd.nd_mreq);
  122                 svc_freereq(rqst);
  123                 return;
  124         }
  125 
  126         if (nd.nd_mreq == NULL) {
  127                 svcerr_decode(rqst);
  128                 svc_freereq(rqst);
  129                 return;
  130         }
  131 
  132         if (nd.nd_repstat & NFSERR_AUTHERR) {
  133                 svcerr_auth(rqst, nd.nd_repstat & ~NFSERR_AUTHERR);
  134                 if (nd.nd_mreq != NULL)
  135                         m_freem(nd.nd_mreq);
  136         } else if (!svc_sendreply_mbuf(rqst, nd.nd_mreq)) {
  137                 svcerr_systemerr(rqst);
  138         }
  139         svc_freereq(rqst);
  140 }
  141 
  142 /*
  143  * Check the cache and, optionally, do the RPC.
  144  * Return the appropriate cache response.
  145  */
  146 static int
  147 nfs_cbproc(struct nfsrv_descript *nd, u_int32_t xid)
  148 {
  149         struct thread *td = curthread;
  150         int cacherep;
  151 
  152         if (nd->nd_nam2 == NULL)
  153                 nd->nd_flag |= ND_STREAMSOCK;
  154 
  155         nfscl_docb(nd, td);
  156         if (nd->nd_repstat == NFSERR_DONTREPLY)
  157                 cacherep = RC_DROPIT;
  158         else
  159                 cacherep = RC_REPLY;
  160         return (cacherep);
  161 }
  162 
  163 /*
  164  * Adds a socket to the list for servicing by nfscbds.
  165  */
  166 int
  167 nfscbd_addsock(struct file *fp)
  168 {
  169         int siz;
  170         struct socket *so;
  171         int error;
  172         SVCXPRT *xprt;
  173 
  174         so = fp->f_data;
  175 
  176         siz = sb_max_adj;
  177         error = soreserve(so, siz, siz);
  178         if (error)
  179                 return (error);
  180 
  181         /*
  182          * Steal the socket from userland so that it doesn't close
  183          * unexpectedly.
  184          */
  185         if (so->so_type == SOCK_DGRAM)
  186                 xprt = svc_dg_create(nfscbd_pool, so, 0, 0);
  187         else
  188                 xprt = svc_vc_create(nfscbd_pool, so, 0, 0);
  189         if (xprt) {
  190                 fp->f_ops = &badfileops;
  191                 fp->f_data = NULL;
  192                 svc_reg(xprt, NFS_CALLBCKPROG, NFSV4_CBVERS, nfscb_program,
  193                     NULL);
  194                 SVC_RELEASE(xprt);
  195         }
  196 
  197         return (0);
  198 }
  199 
  200 /*
  201  * Called by nfssvc() for nfscbds. Just loops around servicing rpc requests
  202  * until it is killed by a signal.
  203  *
  204  * For now, only support callbacks via RPCSEC_GSS if there is a KerberosV
  205  * keytab entry with a host based entry in it on the client. (I'm not even
  206  * sure that getting Acceptor credentials for a user principal with a
  207  * credentials cache is possible, but even if it is, major changes to the
  208  * kgssapi would be required.)
  209  * I don't believe that this is a serious limitation since, as of 2009, most
  210  * NFSv4 servers supporting callbacks are using AUTH_SYS for callbacks even
  211  * when the client is using RPCSEC_GSS. (This BSD server uses AUTH_SYS
  212  * for callbacks unless nfsrv_gsscallbackson is set non-zero.)
  213  */
  214 int
  215 nfscbd_nfsd(struct thread *td, struct nfsd_nfscbd_args *args)
  216 {
  217         char principal[128];
  218         int error;
  219 
  220         if (args != NULL) {
  221                 error = copyinstr(args->principal, principal,
  222                     sizeof(principal), NULL);
  223                 if (error)
  224                         return (error);
  225         } else {
  226                 principal[0] = '\0';
  227         }
  228 
  229         /*
  230          * Only the first nfsd actually does any work. The RPC code
  231          * adds threads to it as needed. Any extra processes offered
  232          * by nfsd just exit. If nfsd is new enough, it will call us
  233          * once with a structure that specifies how many threads to
  234          * use.
  235          */
  236         NFSD_LOCK();
  237         if (nfs_numnfscbd == 0) {
  238                 nfs_numnfscbd++;
  239 
  240                 NFSD_UNLOCK();
  241 
  242                 if (principal[0] != '\0')
  243                         rpc_gss_set_svc_name_call(principal, "kerberosv5",
  244                             GSS_C_INDEFINITE, NFS_CALLBCKPROG, NFSV4_CBVERS);
  245 
  246                 nfscbd_pool->sp_minthreads = 4;
  247                 nfscbd_pool->sp_maxthreads = 4;
  248                         
  249                 svc_run(nfscbd_pool);
  250 
  251                 rpc_gss_clear_svc_name_call(NFS_CALLBCKPROG, NFSV4_CBVERS);
  252 
  253                 NFSD_LOCK();
  254                 nfs_numnfscbd--;
  255                 nfsrvd_cbinit(1);
  256         }
  257         NFSD_UNLOCK();
  258 
  259         return (0);
  260 }
  261 
  262 /*
  263  * Initialize the data structures for the server.
  264  * Handshake with any new nfsds starting up to avoid any chance of
  265  * corruption.
  266  */
  267 void
  268 nfsrvd_cbinit(int terminating)
  269 {
  270 
  271         NFSD_LOCK_ASSERT();
  272 
  273         if (terminating) {
  274                 NFSD_UNLOCK();
  275                 svcpool_destroy(nfscbd_pool);
  276                 nfscbd_pool = NULL;
  277                 NFSD_LOCK();
  278         }
  279 
  280         NFSD_UNLOCK();
  281 
  282         nfscbd_pool = svcpool_create("nfscbd", NULL);
  283         nfscbd_pool->sp_rcache = NULL;
  284         nfscbd_pool->sp_assign = NULL;
  285         nfscbd_pool->sp_done = NULL;
  286 
  287         NFSD_LOCK();
  288 }
  289 

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