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("$FreeBSD$");
   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 SYSCTL_DECL(_vfs_newnfs);
   49 
   50 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 
   57 /*
   58  * NFS client system calls for handling callbacks.
   59  */
   60 
   61 /*
   62  * Handles server to client callbacks.
   63  */
   64 static void
   65 nfscb_program(struct svc_req *rqst, SVCXPRT *xprt)
   66 {
   67         struct nfsrv_descript nd;
   68         int cacherep, credflavor;
   69 
   70         memset(&nd, 0, sizeof(nd));
   71         if (rqst->rq_proc != NFSPROC_NULL &&
   72             rqst->rq_proc != NFSV4PROC_CBCOMPOUND) {
   73                 svcerr_noproc(rqst);
   74                 svc_freereq(rqst);
   75                 return;
   76         }
   77         nd.nd_procnum = rqst->rq_proc;
   78         nd.nd_flag = (ND_NFSCB | ND_NFSV4);
   79 
   80         /*
   81          * Note: we want rq_addr, not svc_getrpccaller for nd_nam2 -
   82          * NFS_SRVMAXDATA uses a NULL value for nd_nam2 to detect TCP
   83          * mounts.
   84          */
   85         nd.nd_mrep = rqst->rq_args;
   86         rqst->rq_args = NULL;
   87         newnfs_realign(&nd.nd_mrep);
   88         nd.nd_md = nd.nd_mrep;
   89         nd.nd_dpos = mtod(nd.nd_md, caddr_t);
   90         nd.nd_nam = svc_getrpccaller(rqst);
   91         nd.nd_nam2 = rqst->rq_addr;
   92         nd.nd_mreq = NULL;
   93         nd.nd_cred = NULL;
   94 
   95         if (nd.nd_procnum != NFSPROC_NULL) {
   96                 if (!svc_getcred(rqst, &nd.nd_cred, &credflavor)) {
   97                         svcerr_weakauth(rqst);
   98                         svc_freereq(rqst);
   99                         m_freem(nd.nd_mrep);
  100                         return;
  101                 }
  102 
  103                 /* For now, I don't care what credential flavor was used. */
  104 #ifdef notyet
  105 #ifdef MAC
  106                 mac_cred_associate_nfsd(nd.nd_cred);
  107 #endif
  108 #endif
  109                 cacherep = nfs_cbproc(&nd, rqst->rq_xid);
  110         } else {
  111                 NFSMGET(nd.nd_mreq);
  112                 nd.nd_mreq->m_len = 0;
  113                 cacherep = RC_REPLY;
  114         }
  115         if (nd.nd_mrep != NULL)
  116                 m_freem(nd.nd_mrep);
  117 
  118         if (nd.nd_cred != NULL)
  119                 crfree(nd.nd_cred);
  120 
  121         if (cacherep == RC_DROPIT) {
  122                 if (nd.nd_mreq != NULL)
  123                         m_freem(nd.nd_mreq);
  124                 svc_freereq(rqst);
  125                 return;
  126         }
  127 
  128         if (nd.nd_mreq == NULL) {
  129                 svcerr_decode(rqst);
  130                 svc_freereq(rqst);
  131                 return;
  132         }
  133 
  134         if (nd.nd_repstat & NFSERR_AUTHERR) {
  135                 svcerr_auth(rqst, nd.nd_repstat & ~NFSERR_AUTHERR);
  136                 if (nd.nd_mreq != NULL)
  137                         m_freem(nd.nd_mreq);
  138         } else if (!svc_sendreply_mbuf(rqst, nd.nd_mreq)) {
  139                 svcerr_systemerr(rqst);
  140         }
  141         svc_freereq(rqst);
  142 }
  143 
  144 /*
  145  * Check the cache and, optionally, do the RPC.
  146  * Return the appropriate cache response.
  147  */
  148 static int
  149 nfs_cbproc(struct nfsrv_descript *nd, u_int32_t xid)
  150 {
  151         struct thread *td = curthread;
  152         int cacherep;
  153 
  154         if (nd->nd_nam2 == NULL)
  155                 nd->nd_flag |= ND_STREAMSOCK;
  156 
  157         nfscl_docb(nd, td);
  158         if (nd->nd_repstat == NFSERR_DONTREPLY)
  159                 cacherep = RC_DROPIT;
  160         else
  161                 cacherep = RC_REPLY;
  162         return (cacherep);
  163 }
  164 
  165 /*
  166  * Adds a socket to the list for servicing by nfscbds.
  167  */
  168 int
  169 nfscbd_addsock(struct file *fp)
  170 {
  171         int siz;
  172         struct socket *so;
  173         int error;
  174         SVCXPRT *xprt;
  175 
  176         so = fp->f_data;
  177 
  178         siz = sb_max_adj;
  179         error = soreserve(so, siz, siz);
  180         if (error)
  181                 return (error);
  182 
  183         /*
  184          * Steal the socket from userland so that it doesn't close
  185          * unexpectedly.
  186          */
  187         if (so->so_type == SOCK_DGRAM)
  188                 xprt = svc_dg_create(nfscbd_pool, so, 0, 0);
  189         else
  190                 xprt = svc_vc_create(nfscbd_pool, so, 0, 0);
  191         if (xprt) {
  192                 fp->f_ops = &badfileops;
  193                 fp->f_data = NULL;
  194                 svc_reg(xprt, NFS_CALLBCKPROG, NFSV4_CBVERS, nfscb_program,
  195                     NULL);
  196                 SVC_RELEASE(xprt);
  197         }
  198 
  199         return (0);
  200 }
  201 
  202 /*
  203  * Called by nfssvc() for nfscbds. Just loops around servicing rpc requests
  204  * until it is killed by a signal.
  205  *
  206  * For now, only support callbacks via RPCSEC_GSS if there is a KerberosV
  207  * keytab entry with a host based entry in it on the client. (I'm not even
  208  * sure that getting Acceptor credentials for a user principal with a
  209  * credentials cache is possible, but even if it is, major changes to the
  210  * kgssapi would be required.)
  211  * I don't believe that this is a serious limitation since, as of 2009, most
  212  * NFSv4 servers supporting callbacks are using AUTH_SYS for callbacks even
  213  * when the client is using RPCSEC_GSS. (This BSD server uses AUTH_SYS
  214  * for callbacks unless nfsrv_gsscallbackson is set non-zero.)
  215  */
  216 int
  217 nfscbd_nfsd(struct thread *td, struct nfsd_nfscbd_args *args)
  218 {
  219         char principal[128];
  220         int error;
  221 
  222         if (args != NULL) {
  223                 error = copyinstr(args->principal, principal,
  224                     sizeof(principal), NULL);
  225                 if (error)
  226                         return (error);
  227         } else {
  228                 principal[0] = '\0';
  229         }
  230 
  231         /*
  232          * Only the first nfsd actually does any work. The RPC code
  233          * adds threads to it as needed. Any extra processes offered
  234          * by nfsd just exit. If nfsd is new enough, it will call us
  235          * once with a structure that specifies how many threads to
  236          * use.
  237          */
  238         NFSD_LOCK();
  239         if (nfs_numnfscbd == 0) {
  240                 nfs_numnfscbd++;
  241 
  242                 NFSD_UNLOCK();
  243 
  244                 if (principal[0] != '\0')
  245                         rpc_gss_set_svc_name_call(principal, "kerberosv5",
  246                             GSS_C_INDEFINITE, NFS_CALLBCKPROG, NFSV4_CBVERS);
  247 
  248                 nfscbd_pool->sp_minthreads = 4;
  249                 nfscbd_pool->sp_maxthreads = 4;
  250                         
  251                 svc_run(nfscbd_pool);
  252 
  253                 rpc_gss_clear_svc_name_call(NFS_CALLBCKPROG, NFSV4_CBVERS);
  254 
  255                 NFSD_LOCK();
  256                 nfs_numnfscbd--;
  257                 nfsrvd_cbinit(1);
  258         }
  259         NFSD_UNLOCK();
  260 
  261         return (0);
  262 }
  263 
  264 /*
  265  * Initialize the data structures for the server.
  266  * Handshake with any new nfsds starting up to avoid any chance of
  267  * corruption.
  268  */
  269 void
  270 nfsrvd_cbinit(int terminating)
  271 {
  272 
  273         NFSD_LOCK_ASSERT();
  274 
  275         if (terminating) {
  276                 NFSD_UNLOCK();
  277                 svcpool_destroy(nfscbd_pool);
  278                 nfscbd_pool = NULL;
  279                 NFSD_LOCK();
  280         }
  281 
  282         NFSD_UNLOCK();
  283 
  284         nfscbd_pool = svcpool_create("nfscbd", NULL);
  285         nfscbd_pool->sp_rcache = NULL;
  286         nfscbd_pool->sp_assign = NULL;
  287         nfscbd_pool->sp_done = NULL;
  288 
  289         NFSD_LOCK();
  290 }
  291

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

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sys/fs/nfsclient/nfs_clkrpc.c