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/8.0/sys/fs/nfsclient/nfs_clkrpc.c 194408 2009-06-17 22:55:59Z rmacklem $");
   36 
   37 #include "opt_inet6.h"
   38 #include "opt_kgssapi.h"
   39 
   40 #include <fs/nfs/nfsport.h>
   41 
   42 #include <rpc/rpc.h>
   43 #include <rpc/rpcsec_gss.h>
   44 #include <rpc/replay.h>
   45 
   46 
   47 NFSDLOCKMUTEX;
   48 
   49 SYSCTL_DECL(_vfs_newnfs);
   50 
   51 SVCPOOL         *nfscbd_pool;
   52 
   53 static int nfs_cbproc(struct nfsrv_descript *, u_int32_t);
   54 
   55 extern u_long sb_max_adj;
   56 extern int nfs_numnfscbd;
   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);
   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         if (nd.nd_procnum != NFSPROC_NULL) {
   97                 if (!svc_getcred(rqst, &nd.nd_cred, &credflavor)) {
   98                         svcerr_weakauth(rqst);
   99                         svc_freereq(rqst);
  100                         m_freem(nd.nd_mrep);
  101                         return;
  102                 }
  103 
  104                 /* For now, I don't care what credential flavor was used. */
  105 #ifdef notyet
  106 #ifdef MAC
  107                 mac_cred_associate_nfsd(nd.nd_cred);
  108 #endif
  109 #endif
  110                 cacherep = nfs_cbproc(&nd, rqst->rq_xid);
  111         } else {
  112                 NFSMGET(nd.nd_mreq);
  113                 nd.nd_mreq->m_len = 0;
  114                 cacherep = RC_REPLY;
  115         }
  116         if (nd.nd_mrep != NULL)
  117                 m_freem(nd.nd_mrep);
  118 
  119         if (nd.nd_cred != NULL)
  120                 crfree(nd.nd_cred);
  121 
  122         if (cacherep == RC_DROPIT) {
  123                 if (nd.nd_mreq != NULL)
  124                         m_freem(nd.nd_mreq);
  125                 svc_freereq(rqst);
  126                 return;
  127         }
  128 
  129         if (nd.nd_mreq == NULL) {
  130                 svcerr_decode(rqst);
  131                 svc_freereq(rqst);
  132                 return;
  133         }
  134 
  135         if (nd.nd_repstat & NFSERR_AUTHERR) {
  136                 svcerr_auth(rqst, nd.nd_repstat & ~NFSERR_AUTHERR);
  137                 if (nd.nd_mreq != NULL)
  138                         m_freem(nd.nd_mreq);
  139         } else if (!svc_sendreply_mbuf(rqst, nd.nd_mreq)) {
  140                 svcerr_systemerr(rqst);
  141         }
  142         svc_freereq(rqst);
  143 }
  144 
  145 /*
  146  * Check the cache and, optionally, do the RPC.
  147  * Return the appropriate cache response.
  148  */
  149 static int
  150 nfs_cbproc(struct nfsrv_descript *nd, u_int32_t xid)
  151 {
  152         struct thread *td = curthread;
  153         int cacherep;
  154 
  155         if (nd->nd_nam2 == NULL)
  156                 nd->nd_flag |= ND_STREAMSOCK;
  157 
  158         nfscl_docb(nd, td);
  159         if (nd->nd_repstat == NFSERR_DONTREPLY)
  160                 cacherep = RC_DROPIT;
  161         else
  162                 cacherep = RC_REPLY;
  163         return (cacherep);
  164 }
  165 
  166 /*
  167  * Adds a socket to the list for servicing by nfscbds.
  168  */
  169 int
  170 nfscbd_addsock(struct file *fp)
  171 {
  172         int siz;
  173         struct socket *so;
  174         int error;
  175         SVCXPRT *xprt;
  176 
  177         so = fp->f_data;
  178 
  179         siz = sb_max_adj;
  180         error = soreserve(so, siz, siz);
  181         if (error)
  182                 return (error);
  183 
  184         /*
  185          * Steal the socket from userland so that it doesn't close
  186          * unexpectedly.
  187          */
  188         if (so->so_type == SOCK_DGRAM)
  189                 xprt = svc_dg_create(nfscbd_pool, so, 0, 0);
  190         else
  191                 xprt = svc_vc_create(nfscbd_pool, so, 0, 0);
  192         if (xprt) {
  193                 fp->f_ops = &badfileops;
  194                 fp->f_data = NULL;
  195                 svc_reg(xprt, NFS_CALLBCKPROG, NFSV4_CBVERS, nfscb_program,
  196                     NULL);
  197                 SVC_RELEASE(xprt);
  198         }
  199 
  200         return (0);
  201 }
  202 
  203 /*
  204  * Called by nfssvc() for nfscbds. Just loops around servicing rpc requests
  205  * until it is killed by a signal.
  206  *
  207  * For now, only support callbacks via RPCSEC_GSS if there is a KerberosV
  208  * keytab entry with a host based entry in it on the client. (I'm not even
  209  * sure that getting Acceptor credentials for a user principal with a
  210  * credentials cache is possible, but even if it is, major changes to the
  211  * kgssapi would be required.)
  212  * I don't believe that this is a serious limitation since, as of 2009, most
  213  * NFSv4 servers supporting callbacks are using AUTH_SYS for callbacks even
  214  * when the client is using RPCSEC_GSS. (This BSD server uses AUTH_SYS
  215  * for callbacks unless nfsrv_gsscallbackson is set non-zero.)
  216  */
  217 int
  218 nfscbd_nfsd(struct thread *td, struct nfsd_nfscbd_args *args)
  219 {
  220 #ifdef KGSSAPI
  221         char principal[128];
  222         int error;
  223 #endif
  224 
  225 #ifdef KGSSAPI
  226         if (args != NULL) {
  227                 error = copyinstr(args->principal, principal,
  228                     sizeof(principal), NULL);
  229                 if (error)
  230                         return (error);
  231         } else {
  232                 principal[0] = '\0';
  233         }
  234 #endif
  235 
  236         /*
  237          * Only the first nfsd actually does any work. The RPC code
  238          * adds threads to it as needed. Any extra processes offered
  239          * by nfsd just exit. If nfsd is new enough, it will call us
  240          * once with a structure that specifies how many threads to
  241          * use.
  242          */
  243         NFSD_LOCK();
  244         if (nfs_numnfscbd == 0) {
  245                 nfs_numnfscbd++;
  246 
  247                 NFSD_UNLOCK();
  248 
  249 #ifdef KGSSAPI
  250                 if (principal[0] != '\0')
  251                         rpc_gss_set_svc_name(principal, "kerberosv5",
  252                             GSS_C_INDEFINITE, NFS_CALLBCKPROG, NFSV4_CBVERS);
  253 #endif
  254 
  255                 nfscbd_pool->sp_minthreads = 4;
  256                 nfscbd_pool->sp_maxthreads = 4;
  257                         
  258                 svc_run(nfscbd_pool);
  259 
  260 #ifdef KGSSAPI
  261                 rpc_gss_clear_svc_name(NFS_CALLBCKPROG, NFSV4_CBVERS);
  262 #endif
  263 
  264                 NFSD_LOCK();
  265                 nfs_numnfscbd--;
  266                 nfsrvd_cbinit(1);
  267         }
  268         NFSD_UNLOCK();
  269 
  270         return (0);
  271 }
  272 
  273 /*
  274  * Initialize the data structures for the server.
  275  * Handshake with any new nfsds starting up to avoid any chance of
  276  * corruption.
  277  */
  278 void
  279 nfsrvd_cbinit(int terminating)
  280 {
  281 
  282         NFSD_LOCK_ASSERT();
  283 
  284         if (terminating) {
  285                 NFSD_UNLOCK();
  286                 svcpool_destroy(nfscbd_pool);
  287                 nfscbd_pool = NULL;
  288                 NFSD_LOCK();
  289         }
  290 
  291         NFSD_UNLOCK();
  292 
  293         nfscbd_pool = svcpool_create("nfscbd", NULL);
  294         nfscbd_pool->sp_rcache = NULL;
  295         nfscbd_pool->sp_assign = NULL;
  296         nfscbd_pool->sp_done = NULL;
  297 
  298         NFSD_LOCK();
  299 }
  300 

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