sys/vfs/nfs/nfs_kerb.c

   1 /*
   2  * Copyright (c) 1992, 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  * 3. 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_nqlease.c       8.9 (Berkeley) 5/20/95
  33  * $FreeBSD: src/sys/nfs/nfs_nqlease.c,v 1.50 2000/02/13 03:32:05 peter Exp $
  34  */
  35
  36 #include <sys/param.h>
  37 #include <sys/vnode.h>
  38 #include <sys/malloc.h>
  39 #include <sys/mount.h>
  40 #include <sys/kernel.h>
  41 #include <sys/proc.h>
  42 #include <sys/systm.h>
  43 #include <sys/mbuf.h>
  44 #include <sys/socket.h>
  45 #include <sys/socketvar.h>
  46 #include <sys/protosw.h>
  47
  48 #include <netinet/in.h>
  49 #include "rpcv2.h"
  50 #include "nfsproto.h"
  51 #include "nfs.h"
  52 #include "nfsm_subs.h"
  53 #include "xdr_subs.h"
  54 #include "nfsmount.h"
  55 #include "nfsnode.h"
  56
  57 #define TRUE    1
  58 #define FALSE   0
  59
  60 #ifndef NFS_NOSERVER
  61
  62 /*
  63  * Nqnfs client helper daemon. Runs once a second to expire leases.
  64  * It also get authorization strings for "kerb" mounts.
  65  * It must start at the beginning of the list again after any potential
  66  * "sleep" since nfs_reclaim() called from vclean() can pull a node off
  67  * the list asynchronously.
  68  */
  69 int
  70 nfs_clientd(struct nfsmount *nmp, struct ucred *cred, struct nfsd_cargs *ncd,
  71             int flag, caddr_t argp, struct thread *td)
  72 {
  73         struct nfsuid *nuidp, *nnuidp;
  74         int error = 0;
  75
  76         /*
  77          * If an authorization string is being passed in, get it.
  78          */
  79         if ((flag & NFSSVC_GOTAUTH) &&
  80             (nmp->nm_state & (NFSSTA_WAITAUTH | NFSSTA_DISMNT)) == 0) {
  81             if (nmp->nm_state & NFSSTA_HASAUTH)
  82                 panic("cld kerb");
  83             if ((flag & NFSSVC_AUTHINFAIL) == 0) {
  84                 if (ncd->ncd_authlen <= nmp->nm_authlen &&
  85                     ncd->ncd_verflen <= nmp->nm_verflen &&
  86                     !copyin(ncd->ncd_authstr,nmp->nm_authstr,ncd->ncd_authlen)&&
  87                     !copyin(ncd->ncd_verfstr,nmp->nm_verfstr,ncd->ncd_verflen)){
  88                     nmp->nm_authtype = ncd->ncd_authtype;
  89                     nmp->nm_authlen = ncd->ncd_authlen;
  90                     nmp->nm_verflen = ncd->ncd_verflen;
  91 #ifdef NFSKERB
  92                     nmp->nm_key = ncd->ncd_key;
  93 #endif
  94                 } else
  95                     nmp->nm_state |= NFSSTA_AUTHERR;
  96             } else
  97                 nmp->nm_state |= NFSSTA_AUTHERR;
  98             nmp->nm_state |= NFSSTA_HASAUTH;
  99             wakeup((caddr_t)&nmp->nm_authlen);
 100         } else
 101             nmp->nm_state |= NFSSTA_WAITAUTH;
 102
 103         /*
 104          * Loop every second updating queue until there is a termination sig.
 105          */
 106         while ((nmp->nm_state & NFSSTA_DISMNT) == 0) {
 107             /*
 108              * Get an authorization string, if required.
 109              */
 110             if ((nmp->nm_state & (NFSSTA_WAITAUTH | NFSSTA_DISMNT | NFSSTA_HASAUTH)) == 0) {
 111                 ncd->ncd_authuid = nmp->nm_authuid;
 112                 if (copyout((caddr_t)ncd, argp, sizeof (struct nfsd_cargs)))
 113                         nmp->nm_state |= NFSSTA_WAITAUTH;
 114                 else
 115                         return (ENEEDAUTH);
 116             }
 117
 118             /*
 119              * Wait a bit (no pun) and do it again.
 120              */
 121             if ((nmp->nm_state & NFSSTA_DISMNT) == 0 &&
 122                 (nmp->nm_state & (NFSSTA_WAITAUTH | NFSSTA_HASAUTH))) {
 123                     error = tsleep((caddr_t)&nmp->nm_authstr, PCATCH,
 124                         "nqnfstimr", hz / 3);
 125                     if (error == EINTR || error == ERESTART)
 126                         (void) dounmount(nmp->nm_mountp, 0, 0);
 127             }
 128         }
 129
 130         /*
 131          * Finally, we can free up the mount structure.
 132          */
 133         TAILQ_FOREACH_MUTABLE(nuidp, &nmp->nm_uidlruhead, nu_lru, nnuidp) {
 134                 LIST_REMOVE(nuidp, nu_hash);
 135                 TAILQ_REMOVE(&nmp->nm_uidlruhead, nuidp, nu_lru);
 136                 kfree((caddr_t)nuidp, M_NFSUID);
 137         }
 138         nfs_free_mount(nmp);
 139         if (error == EWOULDBLOCK)
 140                 error = 0;
 141         return (error);
 142 }
 143
 144 #endif /* NFS_NOSERVER */
 145