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. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  *      @(#)nfs_nqlease.c       8.9 (Berkeley) 5/20/95
  37  * $FreeBSD: src/sys/nfs/nfs_nqlease.c,v 1.50 2000/02/13 03:32:05 peter Exp $
  38  * $DragonFly: src/sys/vfs/nfs/nfs_kerb.c,v 1.3 2006/09/05 00:55:50 dillon Exp $
  39  */
  40
  41 #include <sys/param.h>
  42 #include <sys/vnode.h>
  43 #include <sys/malloc.h>
  44 #include <sys/mount.h>
  45 #include <sys/kernel.h>
  46 #include <sys/proc.h>
  47 #include <sys/systm.h>
  48 #include <sys/mbuf.h>
  49 #include <sys/socket.h>
  50 #include <sys/socketvar.h>
  51 #include <sys/protosw.h>
  52
  53 #include <vm/vm_zone.h>
  54
  55 #include <netinet/in.h>
  56 #include "rpcv2.h"
  57 #include "nfsproto.h"
  58 #include "nfs.h"
  59 #include "nfsm_subs.h"
  60 #include "xdr_subs.h"
  61 #include "nfsmount.h"
  62 #include "nfsnode.h"
  63
  64 #include <sys/thread2.h>
  65
  66 #define TRUE    1
  67 #define FALSE   0
  68
  69 #ifndef NFS_NOSERVER
  70
  71 /*
  72  * Nqnfs client helper daemon. Runs once a second to expire leases.
  73  * It also get authorization strings for "kerb" mounts.
  74  * It must start at the beginning of the list again after any potential
  75  * "sleep" since nfs_reclaim() called from vclean() can pull a node off
  76  * the list asynchronously.
  77  */
  78 int
  79 nfs_clientd(struct nfsmount *nmp, struct ucred *cred, struct nfsd_cargs *ncd,
  80             int flag, caddr_t argp, struct thread *td)
  81 {
  82         struct nfsuid *nuidp, *nnuidp;
  83         int error = 0;
  84
  85         /*
  86          * If an authorization string is being passed in, get it.
  87          */
  88         if ((flag & NFSSVC_GOTAUTH) &&
  89             (nmp->nm_state & (NFSSTA_WAITAUTH | NFSSTA_DISMNT)) == 0) {
  90             if (nmp->nm_state & NFSSTA_HASAUTH)
  91                 panic("cld kerb");
  92             if ((flag & NFSSVC_AUTHINFAIL) == 0) {
  93                 if (ncd->ncd_authlen <= nmp->nm_authlen &&
  94                     ncd->ncd_verflen <= nmp->nm_verflen &&
  95                     !copyin(ncd->ncd_authstr,nmp->nm_authstr,ncd->ncd_authlen)&&
  96                     !copyin(ncd->ncd_verfstr,nmp->nm_verfstr,ncd->ncd_verflen)){
  97                     nmp->nm_authtype = ncd->ncd_authtype;
  98                     nmp->nm_authlen = ncd->ncd_authlen;
  99                     nmp->nm_verflen = ncd->ncd_verflen;
 100 #ifdef NFSKERB
 101                     nmp->nm_key = ncd->ncd_key;
 102 #endif
 103                 } else
 104                     nmp->nm_state |= NFSSTA_AUTHERR;
 105             } else
 106                 nmp->nm_state |= NFSSTA_AUTHERR;
 107             nmp->nm_state |= NFSSTA_HASAUTH;
 108             wakeup((caddr_t)&nmp->nm_authlen);
 109         } else
 110             nmp->nm_state |= NFSSTA_WAITAUTH;
 111
 112         /*
 113          * Loop every second updating queue until there is a termination sig.
 114          */
 115         while ((nmp->nm_state & NFSSTA_DISMNT) == 0) {
 116             /*
 117              * Get an authorization string, if required.
 118              */
 119             if ((nmp->nm_state & (NFSSTA_WAITAUTH | NFSSTA_DISMNT | NFSSTA_HASAUTH)) == 0) {
 120                 ncd->ncd_authuid = nmp->nm_authuid;
 121                 if (copyout((caddr_t)ncd, argp, sizeof (struct nfsd_cargs)))
 122                         nmp->nm_state |= NFSSTA_WAITAUTH;
 123                 else
 124                         return (ENEEDAUTH);
 125             }
 126
 127             /*
 128              * Wait a bit (no pun) and do it again.
 129              */
 130             if ((nmp->nm_state & NFSSTA_DISMNT) == 0 &&
 131                 (nmp->nm_state & (NFSSTA_WAITAUTH | NFSSTA_HASAUTH))) {
 132                     error = tsleep((caddr_t)&nmp->nm_authstr, PCATCH,
 133                         "nqnfstimr", hz / 3);
 134                     if (error == EINTR || error == ERESTART)
 135                         (void) dounmount(nmp->nm_mountp, 0);
 136             }
 137         }
 138
 139         /*
 140          * Finally, we can free up the mount structure.
 141          */
 142         TAILQ_FOREACH_MUTABLE(nuidp, &nmp->nm_uidlruhead, nu_lru, nnuidp) {
 143                 LIST_REMOVE(nuidp, nu_hash);
 144                 TAILQ_REMOVE(&nmp->nm_uidlruhead, nuidp, nu_lru);
 145                 kfree((caddr_t)nuidp, M_NFSUID);
 146         }
 147         nfs_free_mount(nmp);
 148         if (error == EWOULDBLOCK)
 149                 error = 0;
 150         return (error);
 151 }
 152
 153 #endif /* NFS_NOSERVER */
 154