/*
* Copyright 2000, International Business Machines Corporation and others.
* All Rights Reserved.
- *
+ *
* This software has been released under the terms of the IBM Public
* License. For details, see the LICENSE file in the top-level source
* directory or online at http://www.openafs.org/dl/license10.html
*/
+#include <afsconfig.h>
#include <afs/param.h>
+#include <roken.h>
+
#include <afs/stds.h>
-#ifndef DJGPP
#include <windows.h>
#include <winsock2.h>
-#endif
-#include <malloc.h>
#include <string.h>
#include <stdlib.h>
-#ifndef DJGPP
#include <nb30.h>
-#endif
#include <osi.h>
#include "afsd.h"
+int cm_deleteReadOnly = 0;
+int cm_accessPerFileCheck = 0;
+
/* called with scp write-locked, check to see if we have the ACL info we need
* and can get it w/o blocking for any locks.
*
* can't be locked. Thus, this must always be called in a while loop to stabilize
* things, since we can always lose the race condition getting to the parent vnode.
*/
-int cm_HaveAccessRights(struct cm_scache *scp, struct cm_user *up, long rights,
- long *outRightsp)
+int cm_HaveAccessRights(struct cm_scache *scp, struct cm_user *userp, cm_req_t *reqp,
+ afs_uint32 rights,
+ afs_uint32 *outRightsp)
{
- cm_scache_t *aclScp;
- long code;
- cm_fid_t tfid;
- int didLock;
- long trights;
-
- didLock = 0;
- if (scp->fileType == CM_SCACHETYPE_DIRECTORY) {
- aclScp = scp;
- cm_HoldSCache(scp);
- }
- else {
- tfid.cell = scp->fid.cell;
- tfid.volume = scp->fid.volume;
- tfid.vnode = scp->parentVnode;
- tfid.unique = scp->parentUnique;
- aclScp = cm_FindSCache(&tfid);
- if (!aclScp) return 0;
- if (aclScp != scp) {
- code = lock_TryMutex(&aclScp->mx);
- if (code == 0) {
- /* can't get lock safely and easily */
- cm_ReleaseSCache(aclScp);
- return 0;
- }
-
- /* check that we have a callback, too */
- if (!cm_HaveCallback(aclScp)) {
- /* can't use it */
- lock_ReleaseMutex(&aclScp->mx);
- cm_ReleaseSCache(aclScp);
- return 0;
- }
- didLock = 1;
- }
- }
+ cm_scache_t *aclScp;
+ long code;
+ cm_fid_t tfid;
+ int didLock;
+ long trights;
+ int release = 0; /* Used to avoid a call to cm_HoldSCache in the directory case */
+
+ didLock = 0;
+ if (scp->fileType == CM_SCACHETYPE_DIRECTORY || cm_accessPerFileCheck) {
+ aclScp = scp; /* not held, not released */
+ } else {
+ cm_SetFid(&tfid, scp->fid.cell, scp->fid.volume, scp->parentVnode, scp->parentUnique);
+ aclScp = cm_FindSCache(&tfid);
+ if (!aclScp)
+ return 0;
+ if (aclScp != scp) {
+ if (aclScp->fid.vnode < scp->fid.vnode)
+ lock_ReleaseWrite(&scp->rw);
+ lock_ObtainRead(&aclScp->rw);
+ if (aclScp->fid.vnode < scp->fid.vnode)
+ lock_ObtainWrite(&scp->rw);
- lock_AssertMutex(&aclScp->mx);
-
- /* now if rights is a subset of the public rights, we're done.
- * Otherwise, if we an explicit acl entry, we're also in good shape,
- * and can definitively answer.
- */
- if ((~aclScp->anyAccess & rights) == 0) {
- *outRightsp = rights;
+ /* check that we have a callback, too */
+ if (!cm_HaveCallback(aclScp)) {
+ /* can't use it */
+ lock_ReleaseRead(&aclScp->rw);
+ cm_ReleaseSCache(aclScp);
+ return 0;
+ }
+ didLock = 1;
}
- else {
- /* we have to check the specific rights info */
- code = cm_FindACLCache(aclScp, up, &trights);
- if (code) {
- code = 0;
- goto done;
- }
- *outRightsp = trights;
+ release = 1;
+ }
+
+ lock_AssertAny(&aclScp->rw);
+
+ /* now if rights is a subset of the public rights, we're done.
+ * Otherwise, if we an explicit acl entry, we're also in good shape,
+ * and can definitively answer.
+ */
+#ifdef AFS_FREELANCE_CLIENT
+ if (cm_freelanceEnabled &&
+ aclScp->fid.cell==AFS_FAKE_ROOT_CELL_ID &&
+ aclScp->fid.volume==AFS_FAKE_ROOT_VOL_ID)
+ {
+ *outRightsp = aclScp->anyAccess;
+ } else
+#endif
+ if ((~aclScp->anyAccess & rights) == 0) {
+ *outRightsp = rights;
+ } else {
+ /* we have to check the specific rights info */
+ code = cm_FindACLCache(aclScp, userp, &trights);
+ if (code) {
+ code = 0;
+ goto done;
}
+ *outRightsp = trights;
+ }
+ if (scp->fileType > 0 && scp->fileType != CM_SCACHETYPE_DIRECTORY) {
/* check mode bits */
- if (!(scp->unixModeBits & 0400))
- *outRightsp &= ~PRSFS_READ;
- if (!(scp->unixModeBits & 0200))
- *outRightsp &= ~PRSFS_WRITE;
-
- code = 1;
- /* fall through */
-
-done:
- if (didLock)
- lock_ReleaseMutex(&aclScp->mx);
+ if ((scp->unixModeBits & 0400) == 0) {
+ osi_Log2(afsd_logp,"cm_HaveAccessRights UnixMode removing READ scp 0x%p unix 0%o",
+ scp, scp->unixModeBits);
+ *outRightsp &= ~PRSFS_READ;
+ }
+ if ((scp->unixModeBits & 0200) == 0 && (rights != (PRSFS_WRITE | PRSFS_LOCK))) {
+ osi_Log2(afsd_logp,"cm_HaveAccessRights UnixMode removing WRITE scp 0x%p unix 0%o",
+ scp, scp->unixModeBits);
+ *outRightsp &= ~PRSFS_WRITE;
+ }
+ if ((scp->unixModeBits & 0200) == 0 && !cm_deleteReadOnly && (reqp->flags & CM_REQ_SOURCE_SMB)) {
+ osi_Log2(afsd_logp,"cm_HaveAccessRights UnixMode removing DELETE scp 0x%p unix 0%o",
+ scp, scp->unixModeBits);
+ *outRightsp &= ~PRSFS_DELETE;
+ }
+ }
+
+ /* if the user can insert, we must assume they can read/write as well
+ * because we do not have the ability to determine if the current user
+ * is the owner of the file. We will have to make the call to the
+ * file server and let the file server tell us if the request should
+ * be denied.
+ */
+ if ((*outRightsp & PRSFS_INSERT) && (scp->creator == userp))
+ *outRightsp |= PRSFS_READ | PRSFS_WRITE;
+
+ /* if the user can obtain a write-lock, read-locks are implied */
+ if (*outRightsp & PRSFS_WRITE)
+ *outRightsp |= PRSFS_LOCK;
+
+ code = 1;
+ /* fall through */
+
+ done:
+ if (didLock)
+ lock_ReleaseRead(&aclScp->rw);
+ if (release)
cm_ReleaseSCache(aclScp);
- return code;
+ return code;
}
/* called with locked scp; ensures that we have an ACL cache entry for the
- * user specified by the parameter "up."
+ * user specified by the parameter "userp."
* In pathological race conditions, this function may return success without
* having loaded the entry properly (due to a racing callback revoke), so this
* function must also be called in a while loop to make sure that we eventually
* succeed.
*/
-long cm_GetAccessRights(struct cm_scache *scp, struct cm_user *up,
- struct cm_req *reqp)
+long cm_GetAccessRights(struct cm_scache *scp, struct cm_user *userp,
+ struct cm_req *reqp)
{
- long code;
- cm_fid_t tfid;
- cm_scache_t *aclScp;
+ long code;
+ cm_fid_t tfid;
+ cm_scache_t *aclScp = NULL;
+ int got_cb = 0;
+
+ /* pretty easy: just force a pass through the fetch status code */
- /* pretty easy: just force a pass through the fetch status code */
-
- osi_Log2(afsd_logp, "GetAccess scp %x user %x", scp, up);
+ osi_Log2(afsd_logp, "GetAccessRights scp 0x%p user 0x%p", scp, userp);
/* first, start by finding out whether we have a directory or something
- * else, so we can find what object's ACL we need.
+ * else, so we can find what object's ACL we need.
*/
- code = cm_SyncOp(scp, NULL, up, reqp, 0, CM_SCACHESYNC_GETSTATUS
- | CM_SCACHESYNC_NEEDCALLBACK);
-
- if (code) return code;
-
- if (scp->fileType != CM_SCACHETYPE_DIRECTORY) {
- /* not a dir, use parent dir's acl */
- tfid.cell = scp->fid.cell;
- tfid.volume = scp->fid.volume;
- tfid.vnode = scp->parentVnode;
- tfid.unique = scp->parentUnique;
- lock_ReleaseMutex(&scp->mx);
- code = cm_GetSCache(&tfid, &aclScp, up, reqp);
+ if (scp->fileType == CM_SCACHETYPE_DIRECTORY || cm_accessPerFileCheck) {
+ code = cm_SyncOp(scp, NULL, userp, reqp, 0,
+ CM_SCACHESYNC_NEEDCALLBACK | CM_SCACHESYNC_GETSTATUS | CM_SCACHESYNC_FORCECB);
+ if (!code)
+ cm_SyncOpDone(scp, NULL, CM_SCACHESYNC_NEEDCALLBACK | CM_SCACHESYNC_GETSTATUS);
+ else
+ osi_Log3(afsd_logp, "GetAccessRights syncop failure scp %x user %x code %x", scp, userp, code);
+ } else {
+ /* not a dir, use parent dir's acl */
+ cm_SetFid(&tfid, scp->fid.cell, scp->fid.volume, scp->parentVnode, scp->parentUnique);
+ lock_ReleaseWrite(&scp->rw);
+ code = cm_GetSCache(&tfid, NULL, &aclScp, userp, reqp);
if (code) {
- lock_ObtainMutex(&scp->mx);
- return code;
+ lock_ObtainWrite(&scp->rw);
+ goto _done;
}
-
- osi_Log1(afsd_logp, "GetAccess parent %x", aclScp);
- lock_ObtainMutex(&aclScp->mx);
- code = cm_GetCallback(aclScp, up, reqp, 1);
- lock_ReleaseMutex(&aclScp->mx);
+
+ osi_Log2(afsd_logp, "GetAccessRights parent scp %x user %x", aclScp, userp);
+ lock_ObtainWrite(&aclScp->rw);
+ code = cm_SyncOp(aclScp, NULL, userp, reqp, 0,
+ CM_SCACHESYNC_NEEDCALLBACK | CM_SCACHESYNC_GETSTATUS | CM_SCACHESYNC_FORCECB);
+ if (!code)
+ cm_SyncOpDone(aclScp, NULL,
+ CM_SCACHESYNC_NEEDCALLBACK | CM_SCACHESYNC_GETSTATUS);
+ else
+ osi_Log3(afsd_logp, "GetAccessRights parent syncop failure scp %x user %x code %x", aclScp, userp, code);
+ lock_ReleaseWrite(&aclScp->rw);
cm_ReleaseSCache(aclScp);
- lock_ObtainMutex(&scp->mx);
- }
- else {
- code = cm_GetCallback(scp, up, reqp, 1);
+ lock_ObtainWrite(&scp->rw);
}
- return code;
+ _done:
+ return code;
}
git://git.openafs.org / openafs.git / blobdiff