nfs_srvkrpc.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  *      @(#)nfs_syscalls.c      8.5 (Berkeley) 3/30/95
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD: releng/9.1/sys/nfsserver/nfs_srvkrpc.c 224778 2011-08-11 12:30:23Z rwatson $");
   37 
   38 #include "opt_inet6.h"
   39 #include "opt_kgssapi.h"
   40 
   41 #include <sys/param.h>
   42 #include <sys/capability.h>
   43 #include <sys/systm.h>
   44 #include <sys/sysproto.h>
   45 #include <sys/kernel.h>
   46 #include <sys/sysctl.h>
   47 #include <sys/file.h>
   48 #include <sys/filedesc.h>
   49 #include <sys/jail.h>
   50 #include <sys/vnode.h>
   51 #include <sys/malloc.h>
   52 #include <sys/mount.h>
   53 #include <sys/priv.h>
   54 #include <sys/proc.h>
   55 #include <sys/bio.h>
   56 #include <sys/buf.h>
   57 #include <sys/mbuf.h>
   58 #include <sys/socket.h>
   59 #include <sys/socketvar.h>
   60 #include <sys/domain.h>
   61 #include <sys/protosw.h>
   62 #include <sys/namei.h>
   63 #include <sys/fcntl.h>
   64 #include <sys/lockf.h>
   65 #include <sys/eventhandler.h>
   66 
   67 #include <netinet/in.h>
   68 #include <netinet/tcp.h>
   69 #ifdef INET6
   70 #include <net/if.h>
   71 #include <netinet6/in6_var.h>
   72 #endif
   73 
   74 #include <rpc/rpc.h>
   75 #include <rpc/rpcsec_gss.h>
   76 #include <rpc/replay.h>
   77 
   78 #include <nfs/xdr_subs.h>
   79 #include <nfs/nfsproto.h>
   80 #include <nfsserver/nfs.h>
   81 #include <nfsserver/nfsm_subs.h>
   82 #include <nfsserver/nfsrvcache.h>
   83 #include <nfsserver/nfs_fha.h>
   84 
   85 #include <security/mac/mac_framework.h>
   86 
   87 static MALLOC_DEFINE(M_NFSSVC, "nfss_srvsock", "Nfs server structure");
   88 
   89 MALLOC_DEFINE(M_NFSRVDESC, "nfss_srvdesc", "NFS server socket descriptor");
   90 MALLOC_DEFINE(M_NFSD, "nfss_daemon", "Nfs server daemon structure");
   91 
   92 #define TRUE    1
   93 #define FALSE   0
   94 
   95 SYSCTL_DECL(_vfs_nfsrv);
   96 
   97 SVCPOOL         *nfsrv_pool;
   98 int             nfsd_waiting = 0;
   99 int             nfsrv_numnfsd = 0;
  100 struct callout  nfsrv_callout;
  101 static eventhandler_tag nfsrv_nmbclusters_tag;
  102 
  103 static int      nfs_privport = 0;
  104 SYSCTL_INT(_vfs_nfsrv, NFS_NFSPRIVPORT, nfs_privport, CTLFLAG_RW,
  105     &nfs_privport, 0,
  106     "Only allow clients using a privileged port");
  107 SYSCTL_INT(_vfs_nfsrv, OID_AUTO, gatherdelay, CTLFLAG_RW,
  108     &nfsrvw_procrastinate, 0,
  109     "Delay value for write gathering");
  110 SYSCTL_INT(_vfs_nfsrv, OID_AUTO, gatherdelay_v3, CTLFLAG_RW,
  111     &nfsrvw_procrastinate_v3, 0,
  112     "Delay in seconds for NFSv3 write gathering");
  113 
  114 static int      nfssvc_addsock(struct file *, struct thread *);
  115 static int      nfssvc_nfsd(struct thread *, struct nfsd_nfsd_args *);
  116 
  117 extern u_long sb_max_adj;
  118 
  119 int32_t (*nfsrv3_procs[NFS_NPROCS])(struct nfsrv_descript *nd,
  120     struct nfssvc_sock *slp, struct mbuf **mreqp) = {
  121         nfsrv_null,
  122         nfsrv_getattr,
  123         nfsrv_setattr,
  124         nfsrv_lookup,
  125         nfsrv3_access,
  126         nfsrv_readlink,
  127         nfsrv_read,
  128         nfsrv_write,
  129         nfsrv_create,
  130         nfsrv_mkdir,
  131         nfsrv_symlink,
  132         nfsrv_mknod,
  133         nfsrv_remove,
  134         nfsrv_rmdir,
  135         nfsrv_rename,
  136         nfsrv_link,
  137         nfsrv_readdir,
  138         nfsrv_readdirplus,
  139         nfsrv_statfs,
  140         nfsrv_fsinfo,
  141         nfsrv_pathconf,
  142         nfsrv_commit,
  143         nfsrv_noop
  144 };
  145 
  146 /*
  147  * NFS server system calls
  148  */
  149 /*
  150  * This is now called from nfssvc() in nfs/nfs_nfssvc.c.
  151  */
  152 
  153 /*
  154  * Nfs server psuedo system call for the nfsd's
  155  * Based on the flag value it either:
  156  * - adds a socket to the selection list
  157  * - remains in the kernel as an nfsd
  158  * - remains in the kernel as an nfsiod
  159  * For INET6 we suppose that nfsd provides only IN6P_IPV6_V6ONLY sockets
  160  * and that mountd provides
  161  *  - sockaddr with no IPv4-mapped addresses
  162  *  - mask for both INET and INET6 families if there is IPv4-mapped overlap
  163  */
  164 int
  165 nfssvc_nfsserver(struct thread *td, struct nfssvc_args *uap)
  166 {
  167         struct file *fp;
  168         struct nfsd_addsock_args addsockarg;
  169         struct nfsd_nfsd_args nfsdarg;
  170         int error;
  171 
  172         if (uap->flag & NFSSVC_ADDSOCK) {
  173                 error = copyin(uap->argp, (caddr_t)&addsockarg,
  174                     sizeof(addsockarg));
  175                 if (error)
  176                         return (error);
  177                 if ((error = fget(td, addsockarg.sock, CAP_SOCK_ALL, &fp)) != 0)
  178                         return (error);
  179                 if (fp->f_type != DTYPE_SOCKET) {
  180                         fdrop(fp, td);
  181                         return (error); /* XXXRW: Should be EINVAL? */
  182                 }
  183                 error = nfssvc_addsock(fp, td);
  184                 fdrop(fp, td);
  185         } else if (uap->flag & NFSSVC_OLDNFSD)
  186                 error = nfssvc_nfsd(td, NULL);
  187         else if (uap->flag & NFSSVC_NFSD) {
  188                 if (!uap->argp)
  189                         return (EINVAL);
  190                 error = copyin(uap->argp, (caddr_t)&nfsdarg,
  191                     sizeof(nfsdarg));
  192                 if (error)
  193                         return (error);
  194                 error = nfssvc_nfsd(td, &nfsdarg);
  195         } else
  196                 error = ENXIO;
  197         return (error);
  198 }
  199 
  200 /*
  201  * Generate the rpc reply header
  202  * siz arg. is used to decide if adding a cluster is worthwhile
  203  */
  204 struct mbuf *
  205 nfs_rephead(int siz, struct nfsrv_descript *nd, int err,
  206     struct mbuf **mbp, caddr_t *bposp)
  207 {
  208         u_int32_t *tl;
  209         struct mbuf *mreq;
  210         caddr_t bpos;
  211         struct mbuf *mb;
  212 
  213         if (err == EBADRPC)
  214                 return (NULL);
  215 
  216         nd->nd_repstat = err;
  217         if (err && (nd->nd_flag & ND_NFSV3) == 0)       /* XXX recheck */
  218                 siz = 0;
  219 
  220         MGET(mreq, M_WAIT, MT_DATA);
  221 
  222         /*
  223          * If this is a big reply, use a cluster
  224          */
  225         mreq->m_len = 0;
  226         if (siz >= MINCLSIZE) {
  227                 MCLGET(mreq, M_WAIT);
  228         }
  229         mb = mreq;
  230         bpos = mtod(mb, caddr_t);
  231 
  232         if (err != NFSERR_RETVOID) {
  233                 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED);
  234                 if (err)
  235                         *tl = txdr_unsigned(nfsrv_errmap(nd, err));
  236                 else
  237                         *tl = 0;
  238         }
  239 
  240         *mbp = mb;
  241         *bposp = bpos;
  242         if (err != 0 && err != NFSERR_RETVOID)
  243                 nfsrvstats.srvrpc_errs++;
  244 
  245         return (mreq);
  246 }
  247 
  248 static void
  249 nfssvc_program(struct svc_req *rqst, SVCXPRT *xprt)
  250 {
  251         rpcproc_t procnum;
  252         int32_t (*proc)(struct nfsrv_descript *nd, struct nfssvc_sock *slp,
  253             struct mbuf **mreqp);
  254         int flag;
  255         struct nfsrv_descript nd;
  256         struct mbuf *mreq, *mrep;
  257         int error;
  258 
  259         if (rqst->rq_vers == NFS_VER2) {
  260                 if (rqst->rq_proc > NFSV2PROC_STATFS) {
  261                         svcerr_noproc(rqst);
  262                         svc_freereq(rqst);
  263                         return;
  264                 }
  265                 procnum = nfsrv_nfsv3_procid[rqst->rq_proc];
  266                 flag = 0;
  267         } else {
  268                 if (rqst->rq_proc >= NFS_NPROCS) {
  269                         svcerr_noproc(rqst);
  270                         svc_freereq(rqst);
  271                         return;
  272                 }
  273                 procnum = rqst->rq_proc;
  274                 flag = ND_NFSV3;
  275         }
  276         proc = nfsrv3_procs[procnum];
  277 
  278         mreq = mrep = NULL;
  279         mreq = rqst->rq_args;
  280         rqst->rq_args = NULL;
  281         (void)nfs_realign(&mreq, M_WAIT);
  282 
  283         /*
  284          * Note: we want rq_addr, not svc_getrpccaller for nd_nam2 -
  285          * NFS_SRVMAXDATA uses a NULL value for nd_nam2 to detect TCP
  286          * mounts.
  287          */
  288         memset(&nd, 0, sizeof(nd));
  289         nd.nd_md = nd.nd_mrep = mreq;
  290         nd.nd_dpos = mtod(mreq, caddr_t);
  291         nd.nd_nam = svc_getrpccaller(rqst);
  292         nd.nd_nam2 = rqst->rq_addr;
  293         nd.nd_procnum = procnum;
  294         nd.nd_cr = NULL;
  295         nd.nd_flag = flag;
  296 
  297         if (nfs_privport) {
  298                 /* Check if source port is privileged */
  299                 u_short port;
  300                 struct sockaddr *nam = nd.nd_nam;
  301                 struct sockaddr_in *sin;
  302 
  303                 sin = (struct sockaddr_in *)nam;
  304                 /*
  305                  * INET/INET6 - same code:
  306                  *    sin_port and sin6_port are at same offset
  307                  */
  308                 port = ntohs(sin->sin_port);
  309                 if (port >= IPPORT_RESERVED &&
  310                     nd.nd_procnum != NFSPROC_NULL) {
  311 #ifdef INET6
  312                         char b6[INET6_ADDRSTRLEN];
  313 #if defined(KLD_MODULE)
  314                         /* Do not use ip6_sprintf: the nfs module should work without INET6. */
  315 #define ip6_sprintf(buf, a)                                             \
  316                         (sprintf((buf), "%x:%x:%x:%x:%x:%x:%x:%x",      \
  317                             (a)->s6_addr16[0], (a)->s6_addr16[1],       \
  318                             (a)->s6_addr16[2], (a)->s6_addr16[3],       \
  319                             (a)->s6_addr16[4], (a)->s6_addr16[5],       \
  320                             (a)->s6_addr16[6], (a)->s6_addr16[7]),      \
  321                             (buf))
  322 #endif
  323 #endif
  324                         printf("NFS request from unprivileged port (%s:%d)\n",
  325 #ifdef INET6
  326                             sin->sin_family == AF_INET6 ?
  327                             ip6_sprintf(b6, &satosin6(sin)->sin6_addr) :
  328 #if defined(KLD_MODULE)
  329 #undef ip6_sprintf
  330 #endif
  331 #endif
  332                             inet_ntoa(sin->sin_addr), port);
  333                         m_freem(mreq);
  334                         svcerr_weakauth(rqst);
  335                         svc_freereq(rqst);
  336                         return;
  337                 }
  338         }
  339 
  340         if (proc != nfsrv_null) {
  341                 if (!svc_getcred(rqst, &nd.nd_cr, &nd.nd_credflavor)) {
  342                         m_freem(mreq);
  343                         svcerr_weakauth(rqst);
  344                         svc_freereq(rqst);
  345                         return;
  346                 }
  347 #ifdef MAC
  348                 mac_cred_associate_nfsd(nd.nd_cr);
  349 #endif
  350         }
  351         nfsrvstats.srvrpccnt[nd.nd_procnum]++;
  352 
  353         error = proc(&nd, NULL, &mrep);
  354 
  355         if (nd.nd_cr)
  356                 crfree(nd.nd_cr);
  357 
  358         if (mrep == NULL) {
  359                 svcerr_decode(rqst);
  360                 svc_freereq(rqst);
  361                 return;
  362         }
  363         if (error && error != NFSERR_RETVOID) {
  364                 svcerr_systemerr(rqst);
  365                 svc_freereq(rqst);
  366                 return;
  367         }
  368         if (nd.nd_repstat & NFSERR_AUTHERR) {
  369                 svcerr_auth(rqst, nd.nd_repstat & ~NFSERR_AUTHERR);
  370                 m_freem(mrep);
  371         } else {
  372                 if (!svc_sendreply_mbuf(rqst, mrep))
  373                         svcerr_systemerr(rqst);
  374         }
  375         svc_freereq(rqst);
  376 }
  377 
  378 /*
  379  * Adds a socket to the list for servicing by nfsds.
  380  */
  381 static int
  382 nfssvc_addsock(struct file *fp, struct thread *td)
  383 {
  384         int siz;
  385         struct socket *so;
  386         int error;
  387         SVCXPRT *xprt;
  388 
  389         so = fp->f_data;
  390 
  391         siz = sb_max_adj;
  392         error = soreserve(so, siz, siz);
  393         if (error)
  394                 return (error);
  395 
  396         /*
  397          * Steal the socket from userland so that it doesn't close
  398          * unexpectedly.
  399          */
  400         if (so->so_type == SOCK_DGRAM)
  401                 xprt = svc_dg_create(nfsrv_pool, so, 0, 0);
  402         else
  403                 xprt = svc_vc_create(nfsrv_pool, so, 0, 0);
  404         if (xprt) {
  405                 fp->f_ops = &badfileops;
  406                 fp->f_data = NULL;
  407                 svc_reg(xprt, NFS_PROG, NFS_VER2, nfssvc_program, NULL);
  408                 svc_reg(xprt, NFS_PROG, NFS_VER3, nfssvc_program, NULL);
  409                 SVC_RELEASE(xprt);
  410         }
  411 
  412         return (0);
  413 }
  414 
  415 /*
  416  * Called by nfssvc() for nfsds.  Just loops around servicing rpc requests
  417  * until it is killed by a signal.
  418  */
  419 static int
  420 nfssvc_nfsd(struct thread *td, struct nfsd_nfsd_args *args)
  421 {
  422         char principal[128];
  423         int error;
  424 
  425         if (args) {
  426                 error = copyinstr(args->principal, principal,
  427                     sizeof(principal), NULL);
  428                 if (error)
  429                         return (error);
  430         } else {
  431                 memcpy(principal, "nfs@", 4);
  432                 getcredhostname(td->td_ucred, principal + 4,
  433                     sizeof(principal) - 4);
  434         }
  435 
  436         /*
  437          * Only the first nfsd actually does any work.  The RPC code
  438          * adds threads to it as needed.  Any extra processes offered
  439          * by nfsd just exit.  If nfsd is new enough, it will call us
  440          * once with a structure that specifies how many threads to
  441          * use.
  442          */
  443         NFSD_LOCK();
  444         if (nfsrv_numnfsd == 0) {
  445                 nfsrv_numnfsd++;
  446 
  447                 NFSD_UNLOCK();
  448 
  449                 rpc_gss_set_svc_name_call(principal, "kerberosv5",
  450                     GSS_C_INDEFINITE, NFS_PROG, NFS_VER2);
  451                 rpc_gss_set_svc_name_call(principal, "kerberosv5",
  452                     GSS_C_INDEFINITE, NFS_PROG, NFS_VER3);
  453 
  454                 if (args) {
  455                         nfsrv_pool->sp_minthreads = args->minthreads;
  456                         nfsrv_pool->sp_maxthreads = args->maxthreads;
  457                 } else {
  458                         nfsrv_pool->sp_minthreads = 4;
  459                         nfsrv_pool->sp_maxthreads = 4;
  460                 }
  461 
  462                 svc_run(nfsrv_pool);
  463 
  464                 rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER2);
  465                 rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER3);
  466 
  467                 NFSD_LOCK();
  468                 nfsrv_numnfsd--;
  469                 nfsrv_init(TRUE);
  470         }
  471         NFSD_UNLOCK();
  472 
  473         return (0);
  474 }
  475 
  476 /*
  477  * Size the NFS server's duplicate request cache at 1/2 the
  478  * nmbclusters, floating within a (64, 2048) range.  This is to
  479  * prevent all mbuf clusters being tied up in the NFS dupreq
  480  * cache for small values of nmbclusters.
  481  */
  482 static size_t
  483 nfsrv_replay_size(void)
  484 {
  485         size_t replaysiz;
  486 
  487         replaysiz = nmbclusters / 2;
  488         if (replaysiz > NFSRVCACHE_MAX_SIZE)
  489                 replaysiz = NFSRVCACHE_MAX_SIZE;
  490         if (replaysiz < NFSRVCACHE_MIN_SIZE)
  491                 replaysiz = NFSRVCACHE_MIN_SIZE;
  492         replaysiz *= MCLBYTES;
  493 
  494         return (replaysiz);
  495 }
  496 
  497 /*
  498  * Called when nmbclusters changes - we resize the replay cache
  499  * accordingly.
  500  */
  501 static void
  502 nfsrv_nmbclusters_change(void *tag)
  503 {
  504 
  505         if (nfsrv_pool)
  506                 replay_setsize(nfsrv_pool->sp_rcache, nfsrv_replay_size());
  507 }
  508 
  509 /*
  510  * Initialize the data structures for the server.
  511  * Handshake with any new nfsds starting up to avoid any chance of
  512  * corruption.
  513  */
  514 void
  515 nfsrv_init(int terminating)
  516 {
  517 
  518         NFSD_LOCK_ASSERT();
  519 
  520         if (terminating) {
  521                 NFSD_UNLOCK();
  522                 EVENTHANDLER_DEREGISTER(nmbclusters_change,
  523                     nfsrv_nmbclusters_tag);
  524                 svcpool_destroy(nfsrv_pool);
  525                 nfsrv_pool = NULL;
  526                 NFSD_LOCK();
  527         } else
  528                 nfs_pub.np_valid = 0;
  529 
  530         NFSD_UNLOCK();
  531 
  532         nfsrv_pool = svcpool_create("nfsd", SYSCTL_STATIC_CHILDREN(_vfs_nfsrv));
  533         nfsrv_pool->sp_rcache = replay_newcache(nfsrv_replay_size());
  534         nfsrv_pool->sp_assign = fha_assign;
  535         nfsrv_pool->sp_done = fha_nd_complete;
  536         nfsrv_nmbclusters_tag = EVENTHANDLER_REGISTER(nmbclusters_change,
  537             nfsrv_nmbclusters_change, NULL, EVENTHANDLER_PRI_FIRST);
  538 
  539         NFSD_LOCK();
  540 }
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FreeBSD/Linux Kernel Cross Reference sys/nfsserver/nfs_srvkrpc.c

FreeBSD/Linux Kernel Cross Reference
sys/nfsserver/nfs_srvkrpc.c
