nfs_nfsdkrpc.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/10.0/sys/fs/nfsserver/nfs_nfsdkrpc.c 249596 2013-04-17 22:42:43Z ken $");
   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 
   45 #include <nfs/nfs_fha.h>
   46 #include <fs/nfsserver/nfs_fha_new.h>
   47 
   48 #include <security/mac/mac_framework.h>
   49 
   50 NFSDLOCKMUTEX;
   51 NFSV4ROOTLOCKMUTEX;
   52 struct nfsv4lock nfsd_suspend_lock;
   53 
   54 /*
   55  * Mapping of old NFS Version 2 RPC numbers to generic numbers.
   56  */
   57 int newnfs_nfsv3_procid[NFS_V3NPROCS] = {
   58         NFSPROC_NULL,
   59         NFSPROC_GETATTR,
   60         NFSPROC_SETATTR,
   61         NFSPROC_NOOP,
   62         NFSPROC_LOOKUP,
   63         NFSPROC_READLINK,
   64         NFSPROC_READ,
   65         NFSPROC_NOOP,
   66         NFSPROC_WRITE,
   67         NFSPROC_CREATE,
   68         NFSPROC_REMOVE,
   69         NFSPROC_RENAME,
   70         NFSPROC_LINK,
   71         NFSPROC_SYMLINK,
   72         NFSPROC_MKDIR,
   73         NFSPROC_RMDIR,
   74         NFSPROC_READDIR,
   75         NFSPROC_FSSTAT,
   76         NFSPROC_NOOP,
   77         NFSPROC_NOOP,
   78         NFSPROC_NOOP,
   79         NFSPROC_NOOP,
   80 };
   81 
   82 
   83 SYSCTL_DECL(_vfs_nfsd);
   84 
   85 SVCPOOL         *nfsrvd_pool;
   86 
   87 static int      nfs_privport = 0;
   88 SYSCTL_INT(_vfs_nfsd, OID_AUTO, nfs_privport, CTLFLAG_RW,
   89     &nfs_privport, 0,
   90     "Only allow clients using a privileged port for NFSv2 and 3");
   91 
   92 static int      nfs_minvers = NFS_VER2;
   93 SYSCTL_INT(_vfs_nfsd, OID_AUTO, server_min_nfsvers, CTLFLAG_RW,
   94     &nfs_minvers, 0, "The lowest version of NFS handled by the server");
   95 
   96 static int      nfs_maxvers = NFS_VER4;
   97 SYSCTL_INT(_vfs_nfsd, OID_AUTO, server_max_nfsvers, CTLFLAG_RW,
   98     &nfs_maxvers, 0, "The highest version of NFS handled by the server");
   99 
  100 static int nfs_proc(struct nfsrv_descript *, u_int32_t, struct socket *,
  101     u_int64_t, struct nfsrvcache **);
  102 
  103 extern u_long sb_max_adj;
  104 extern int newnfs_numnfsd;
  105 extern struct proc *nfsd_master_proc;
  106 
  107 /*
  108  * NFS server system calls
  109  */
  110 
  111 static void
  112 nfssvc_program(struct svc_req *rqst, SVCXPRT *xprt)
  113 {
  114         struct nfsrv_descript nd;
  115         struct nfsrvcache *rp = NULL;
  116         int cacherep, credflavor;
  117 
  118         memset(&nd, 0, sizeof(nd));
  119         if (rqst->rq_vers == NFS_VER2) {
  120                 if (rqst->rq_proc > NFSV2PROC_STATFS) {
  121                         svcerr_noproc(rqst);
  122                         svc_freereq(rqst);
  123                         goto out;
  124                 }
  125                 nd.nd_procnum = newnfs_nfsv3_procid[rqst->rq_proc];
  126                 nd.nd_flag = ND_NFSV2;
  127         } else if (rqst->rq_vers == NFS_VER3) {
  128                 if (rqst->rq_proc >= NFS_V3NPROCS) {
  129                         svcerr_noproc(rqst);
  130                         svc_freereq(rqst);
  131                         goto out;
  132                 }
  133                 nd.nd_procnum = rqst->rq_proc;
  134                 nd.nd_flag = ND_NFSV3;
  135         } else {
  136                 if (rqst->rq_proc != NFSPROC_NULL &&
  137                     rqst->rq_proc != NFSV4PROC_COMPOUND) {
  138                         svcerr_noproc(rqst);
  139                         svc_freereq(rqst);
  140                         goto out;
  141                 }
  142                 nd.nd_procnum = rqst->rq_proc;
  143                 nd.nd_flag = ND_NFSV4;
  144         }
  145 
  146         /*
  147          * Note: we want rq_addr, not svc_getrpccaller for nd_nam2 -
  148          * NFS_SRVMAXDATA uses a NULL value for nd_nam2 to detect TCP
  149          * mounts.
  150          */
  151         nd.nd_mrep = rqst->rq_args;
  152         rqst->rq_args = NULL;
  153         newnfs_realign(&nd.nd_mrep, M_WAITOK);
  154         nd.nd_md = nd.nd_mrep;
  155         nd.nd_dpos = mtod(nd.nd_md, caddr_t);
  156         nd.nd_nam = svc_getrpccaller(rqst);
  157         nd.nd_nam2 = rqst->rq_addr;
  158         nd.nd_mreq = NULL;
  159         nd.nd_cred = NULL;
  160 
  161         if (nfs_privport && (nd.nd_flag & ND_NFSV4) == 0) {
  162                 /* Check if source port is privileged */
  163                 u_short port;
  164                 struct sockaddr *nam = nd.nd_nam;
  165                 struct sockaddr_in *sin;
  166 
  167                 sin = (struct sockaddr_in *)nam;
  168                 /*
  169                  * INET/INET6 - same code:
  170                  *    sin_port and sin6_port are at same offset
  171                  */
  172                 port = ntohs(sin->sin_port);
  173                 if (port >= IPPORT_RESERVED &&
  174                     nd.nd_procnum != NFSPROC_NULL) {
  175 #ifdef INET6
  176                         char b6[INET6_ADDRSTRLEN];
  177 #if defined(KLD_MODULE)
  178                         /* Do not use ip6_sprintf: the nfs module should work without INET6. */
  179 #define ip6_sprintf(buf, a)                                             \
  180                         (sprintf((buf), "%x:%x:%x:%x:%x:%x:%x:%x",      \
  181                             (a)->s6_addr16[0], (a)->s6_addr16[1],       \
  182                             (a)->s6_addr16[2], (a)->s6_addr16[3],       \
  183                             (a)->s6_addr16[4], (a)->s6_addr16[5],       \
  184                             (a)->s6_addr16[6], (a)->s6_addr16[7]),      \
  185                             (buf))
  186 #endif
  187 #endif
  188                         printf("NFS request from unprivileged port (%s:%d)\n",
  189 #ifdef INET6
  190                             sin->sin_family == AF_INET6 ?
  191                             ip6_sprintf(b6, &satosin6(sin)->sin6_addr) :
  192 #if defined(KLD_MODULE)
  193 #undef ip6_sprintf
  194 #endif
  195 #endif
  196                             inet_ntoa(sin->sin_addr), port);
  197                         svcerr_weakauth(rqst);
  198                         svc_freereq(rqst);
  199                         m_freem(nd.nd_mrep);
  200                         goto out;
  201                 }
  202         }
  203 
  204         if (nd.nd_procnum != NFSPROC_NULL) {
  205                 if (!svc_getcred(rqst, &nd.nd_cred, &credflavor)) {
  206                         svcerr_weakauth(rqst);
  207                         svc_freereq(rqst);
  208                         m_freem(nd.nd_mrep);
  209                         goto out;
  210                 }
  211 
  212                 /* Set the flag based on credflavor */
  213                 if (credflavor == RPCSEC_GSS_KRB5) {
  214                         nd.nd_flag |= ND_GSS;
  215                 } else if (credflavor == RPCSEC_GSS_KRB5I) {
  216                         nd.nd_flag |= (ND_GSS | ND_GSSINTEGRITY);
  217                 } else if (credflavor == RPCSEC_GSS_KRB5P) {
  218                         nd.nd_flag |= (ND_GSS | ND_GSSPRIVACY);
  219                 } else if (credflavor != AUTH_SYS) {
  220                         svcerr_weakauth(rqst);
  221                         svc_freereq(rqst);
  222                         m_freem(nd.nd_mrep);
  223                         goto out;
  224                 }
  225 
  226 #ifdef MAC
  227                 mac_cred_associate_nfsd(nd.nd_cred);
  228 #endif
  229                 /*
  230                  * Get a refcnt (shared lock) on nfsd_suspend_lock.
  231                  * NFSSVC_SUSPENDNFSD will take an exclusive lock on
  232                  * nfsd_suspend_lock to suspend these threads.
  233                  * This must be done here, before the check of
  234                  * nfsv4root exports by nfsvno_v4rootexport().
  235                  */
  236                 NFSLOCKV4ROOTMUTEX();
  237                 nfsv4_getref(&nfsd_suspend_lock, NULL, NFSV4ROOTLOCKMUTEXPTR,
  238                     NULL);
  239                 NFSUNLOCKV4ROOTMUTEX();
  240 
  241                 if ((nd.nd_flag & ND_NFSV4) != 0) {
  242                         nd.nd_repstat = nfsvno_v4rootexport(&nd);
  243                         if (nd.nd_repstat != 0) {
  244                                 NFSLOCKV4ROOTMUTEX();
  245                                 nfsv4_relref(&nfsd_suspend_lock);
  246                                 NFSUNLOCKV4ROOTMUTEX();
  247                                 svcerr_weakauth(rqst);
  248                                 svc_freereq(rqst);
  249                                 m_freem(nd.nd_mrep);
  250                                 goto out;
  251                         }
  252                 }
  253 
  254                 cacherep = nfs_proc(&nd, rqst->rq_xid, xprt->xp_socket,
  255                     xprt->xp_sockref, &rp);
  256                 NFSLOCKV4ROOTMUTEX();
  257                 nfsv4_relref(&nfsd_suspend_lock);
  258                 NFSUNLOCKV4ROOTMUTEX();
  259         } else {
  260                 NFSMGET(nd.nd_mreq);
  261                 nd.nd_mreq->m_len = 0;
  262                 cacherep = RC_REPLY;
  263         }
  264         if (nd.nd_mrep != NULL)
  265                 m_freem(nd.nd_mrep);
  266 
  267         if (nd.nd_cred != NULL)
  268                 crfree(nd.nd_cred);
  269 
  270         if (cacherep == RC_DROPIT) {
  271                 if (nd.nd_mreq != NULL)
  272                         m_freem(nd.nd_mreq);
  273                 svc_freereq(rqst);
  274                 goto out;
  275         }
  276 
  277         if (nd.nd_mreq == NULL) {
  278                 svcerr_decode(rqst);
  279                 svc_freereq(rqst);
  280                 goto out;
  281         }
  282 
  283         if (nd.nd_repstat & NFSERR_AUTHERR) {
  284                 svcerr_auth(rqst, nd.nd_repstat & ~NFSERR_AUTHERR);
  285                 if (nd.nd_mreq != NULL)
  286                         m_freem(nd.nd_mreq);
  287         } else if (!svc_sendreply_mbuf(rqst, nd.nd_mreq)) {
  288                 svcerr_systemerr(rqst);
  289         }
  290         if (rp != NULL)
  291                 nfsrvd_sentcache(rp, xprt->xp_socket, 0);
  292         svc_freereq(rqst);
  293 
  294 out:
  295         NFSEXITCODE(0);
  296 }
  297 
  298 /*
  299  * Check the cache and, optionally, do the RPC.
  300  * Return the appropriate cache response.
  301  */
  302 static int
  303 nfs_proc(struct nfsrv_descript *nd, u_int32_t xid, struct socket *so,
  304     u_int64_t sockref, struct nfsrvcache **rpp)
  305 {
  306         struct thread *td = curthread;
  307         int cacherep = RC_DOIT, isdgram;
  308 
  309         *rpp = NULL;
  310         if (nd->nd_nam2 == NULL) {
  311                 nd->nd_flag |= ND_STREAMSOCK;
  312                 isdgram = 0;
  313         } else {
  314                 isdgram = 1;
  315         }
  316 
  317         /*
  318          * Two cases:
  319          * 1 - For NFSv2 over UDP, if we are near our malloc/mget
  320          *     limit, just drop the request. There is no
  321          *     NFSERR_RESOURCE or NFSERR_DELAY for NFSv2 and the
  322          *     client will timeout/retry over UDP in a little while.
  323          * 2 - nd_repstat == 0 && nd_mreq == NULL, which
  324          *     means a normal nfs rpc, so check the cache
  325          */
  326         if ((nd->nd_flag & ND_NFSV2) && nd->nd_nam2 != NULL &&
  327             nfsrv_mallocmget_limit()) {
  328                 cacherep = RC_DROPIT;
  329         } else {
  330                 /*
  331                  * For NFSv3, play it safe and assume that the client is
  332                  * doing retries on the same TCP connection.
  333                  */
  334                 if ((nd->nd_flag & (ND_NFSV4 | ND_STREAMSOCK)) ==
  335                     ND_STREAMSOCK)
  336                         nd->nd_flag |= ND_SAMETCPCONN;
  337                 nd->nd_retxid = xid;
  338                 nd->nd_tcpconntime = NFSD_MONOSEC;
  339                 nd->nd_sockref = sockref;
  340                 cacherep = nfsrvd_getcache(nd, so);
  341         }
  342 
  343         /*
  344          * Handle the request. There are three cases.
  345          * RC_DOIT - do the RPC
  346          * RC_REPLY - return the reply already created
  347          * RC_DROPIT - just throw the request away
  348          */
  349         if (cacherep == RC_DOIT) {
  350                 nfsrvd_dorpc(nd, isdgram, td);
  351                 if (nd->nd_repstat == NFSERR_DONTREPLY)
  352                         cacherep = RC_DROPIT;
  353                 else
  354                         cacherep = RC_REPLY;
  355                 *rpp = nfsrvd_updatecache(nd, so);
  356         }
  357 
  358         NFSEXITCODE2(0, nd);
  359         return (cacherep);
  360 }
  361 
  362 /*
  363  * Adds a socket to the list for servicing by nfsds.
  364  */
  365 int
  366 nfsrvd_addsock(struct file *fp)
  367 {
  368         int siz;
  369         struct socket *so;
  370         int error = 0;
  371         SVCXPRT *xprt;
  372         static u_int64_t sockref = 0;
  373 
  374         so = fp->f_data;
  375 
  376         siz = sb_max_adj;
  377         error = soreserve(so, siz, siz);
  378         if (error)
  379                 goto out;
  380 
  381         /*
  382          * Steal the socket from userland so that it doesn't close
  383          * unexpectedly.
  384          */
  385         if (so->so_type == SOCK_DGRAM)
  386                 xprt = svc_dg_create(nfsrvd_pool, so, 0, 0);
  387         else
  388                 xprt = svc_vc_create(nfsrvd_pool, so, 0, 0);
  389         if (xprt) {
  390                 fp->f_ops = &badfileops;
  391                 fp->f_data = NULL;
  392                 xprt->xp_sockref = ++sockref;
  393                 if (nfs_minvers == NFS_VER2)
  394                         svc_reg(xprt, NFS_PROG, NFS_VER2, nfssvc_program,
  395                             NULL);
  396                 if (nfs_minvers <= NFS_VER3 && nfs_maxvers >= NFS_VER3)
  397                         svc_reg(xprt, NFS_PROG, NFS_VER3, nfssvc_program,
  398                             NULL);
  399                 if (nfs_maxvers >= NFS_VER4)
  400                         svc_reg(xprt, NFS_PROG, NFS_VER4, nfssvc_program,
  401                             NULL);
  402                 SVC_RELEASE(xprt);
  403         }
  404 
  405 out:
  406         NFSEXITCODE(error);
  407         return (error);
  408 }
  409 
  410 /*
  411  * Called by nfssvc() for nfsds. Just loops around servicing rpc requests
  412  * until it is killed by a signal.
  413  */
  414 int
  415 nfsrvd_nfsd(struct thread *td, struct nfsd_nfsd_args *args)
  416 {
  417         char principal[MAXHOSTNAMELEN + 5];
  418         int error = 0;
  419         bool_t ret2, ret3, ret4;
  420 
  421         error = copyinstr(args->principal, principal, sizeof (principal),
  422             NULL);
  423         if (error)
  424                 goto out;
  425 
  426         /*
  427          * Only the first nfsd actually does any work. The RPC code
  428          * adds threads to it as needed. Any extra processes offered
  429          * by nfsd just exit. If nfsd is new enough, it will call us
  430          * once with a structure that specifies how many threads to
  431          * use.
  432          */
  433         NFSD_LOCK();
  434         if (newnfs_numnfsd == 0) {
  435                 newnfs_numnfsd++;
  436 
  437                 NFSD_UNLOCK();
  438 
  439                 /* An empty string implies AUTH_SYS only. */
  440                 if (principal[0] != '\0') {
  441                         ret2 = rpc_gss_set_svc_name_call(principal,
  442                             "kerberosv5", GSS_C_INDEFINITE, NFS_PROG, NFS_VER2);
  443                         ret3 = rpc_gss_set_svc_name_call(principal,
  444                             "kerberosv5", GSS_C_INDEFINITE, NFS_PROG, NFS_VER3);
  445                         ret4 = rpc_gss_set_svc_name_call(principal,
  446                             "kerberosv5", GSS_C_INDEFINITE, NFS_PROG, NFS_VER4);
  447 
  448                         if (!ret2 || !ret3 || !ret4)
  449                                 printf("nfsd: can't register svc name\n");
  450                 }
  451 
  452                 nfsrvd_pool->sp_minthreads = args->minthreads;
  453                 nfsrvd_pool->sp_maxthreads = args->maxthreads;
  454                         
  455                 svc_run(nfsrvd_pool);
  456 
  457                 if (principal[0] != '\0') {
  458                         rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER2);
  459                         rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER3);
  460                         rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER4);
  461                 }
  462 
  463                 NFSD_LOCK();
  464                 newnfs_numnfsd--;
  465                 nfsrvd_init(1);
  466         }
  467         NFSD_UNLOCK();
  468 
  469 out:
  470         NFSEXITCODE(error);
  471         return (error);
  472 }
  473 
  474 /*
  475  * Initialize the data structures for the server.
  476  * Handshake with any new nfsds starting up to avoid any chance of
  477  * corruption.
  478  */
  479 void
  480 nfsrvd_init(int terminating)
  481 {
  482 
  483         NFSD_LOCK_ASSERT();
  484 
  485         if (terminating) {
  486                 nfsd_master_proc = NULL;
  487                 NFSD_UNLOCK();
  488                 svcpool_destroy(nfsrvd_pool);
  489                 nfsrvd_pool = NULL;
  490                 NFSD_LOCK();
  491         }
  492 
  493         NFSD_UNLOCK();
  494 
  495         nfsrvd_pool = svcpool_create("nfsd", SYSCTL_STATIC_CHILDREN(_vfs_nfsd));
  496         nfsrvd_pool->sp_rcache = NULL;
  497         nfsrvd_pool->sp_assign = fhanew_assign;
  498         nfsrvd_pool->sp_done = fha_nd_complete;
  499 
  500         NFSD_LOCK();
  501 }
  502
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FreeBSD/Linux Kernel Cross Reference sys/fs/nfsserver/nfs_nfsdkrpc.c

FreeBSD/Linux Kernel Cross Reference
sys/fs/nfsserver/nfs_nfsdkrpc.c
