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* rpcsec_gss-from_cel: (21 commits)
NFS: Retry SETCLIENTID with AUTH_SYS instead of AUTH_NONE
NFSv4: Don't clear the machine cred when client establish returns EACCES
NFSv4: Fix issues in nfs4_discover_server_trunking
NFSv4: Fix the fallback to AUTH_NULL if krb5i is not available
NFS: Use server-recommended security flavor by default (NFSv3)
SUNRPC: Don't recognize RPC_AUTH_MAXFLAVOR
NFS: Use "krb5i" to establish NFSv4 state whenever possible
NFS: Try AUTH_UNIX when PUTROOTFH gets NFS4ERR_WRONGSEC
NFS: Use static list of security flavors during root FH lookup recovery
NFS: Avoid PUTROOTFH when managing leases
NFS: Clean up nfs4_proc_get_rootfh
NFS: Handle missing rpc.gssd when looking up root FH
SUNRPC: Remove EXPORT_SYMBOL_GPL() from GSS mech switch
SUNRPC: Make gss_mech_get() static
SUNRPC: Refactor nfsd4_do_encode_secinfo()
SUNRPC: Consider qop when looking up pseudoflavors
SUNRPC: Load GSS kernel module by OID
SUNRPC: Introduce rpcauth_get_pseudoflavor()
SUNRPC: Define rpcsec_gss_info structure
NFS: Remove unneeded forward declaration
...
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If we already checked the user access permissions on the original open,
then don't bother checking again on recovery. Doing so can cause a
deadlock with NFSv4.1, since the may_open() operation is not privileged.
Furthermore, we can't report an access permission failure here anyway.
Signed-off-by: Trond Myklebust <[email protected]>
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If we're in a delegation recall situation, we can't do a delegated open.
Signed-off-by: Trond Myklebust <[email protected]>
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When we're doing open-by-filehandle in NFSv4.1, we shouldn't need to
do the cache consistency revalidation on the directory. It is
therefore more efficient to just use open_noattr, which returns the
file attributes, but not the directory attributes.
Signed-off-by: Trond Myklebust <[email protected]>
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Recently I changed the SETCLIENTID code to use AUTH_GSS(krb5i), and
then retry with AUTH_NONE if that didn't work. This was to enable
Kerberos NFS mounts to work without forcing Linux NFS clients to
have a keytab on hand.
Rick Macklem reports that the FreeBSD server accepts AUTH_NONE only
for NULL operations (thus certainly not for SETCLIENTID). Falling
back to AUTH_NONE means our proposed 3.10 NFS client will not
interoperate with FreeBSD servers over NFSv4 unless Kerberos is
fully configured on both ends.
If the Linux client falls back to using AUTH_SYS instead for
SETCLIENTID, all should work fine as long as the NFS server is
configured to allow AUTH_SYS for SETCLIENTID.
This may still prevent access to Kerberos-only FreeBSD servers by
Linux clients with no keytab. Rick is of the opinion that the
security settings the server applies to its pseudo-fs should also
apply to the SETCLIENTID operation.
Linux and Solaris NFS servers do not place that limitation on
SETCLIENTID. The security settings for the server's pseudo-fs are
determined automatically as the union of security flavors allowed on
real exports, as recommended by RFC 3530bis; and the flavors allowed
for SETCLIENTID are all flavors supported by the respective server
implementation.
Signed-off-by: Chuck Lever <[email protected]>
Signed-off-by: Trond Myklebust <[email protected]>
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We should always clear it before initiating file recovery.
Also ensure that we clear it after a CLOSE and/or after TEST_STATEID fails.
Signed-off-by: Trond Myklebust <[email protected]>
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Defensive patch to ensure that we copy the state->open_stateid, which
can never be set to the delegation stateid.
Signed-off-by: Trond Myklebust <[email protected]>
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Fix nfs4_select_rw_stateid() so that it chooses the open stateid
(or an all-zero stateid) if the delegation does not match the selected
read/write mode.
Signed-off-by: Trond Myklebust <[email protected]>
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RFC 3530 says that the seconds value of a nfstime4 structure is a 64bit
value, but we are instead sending a 32-bit 0 and then a 32bit conversion
of the 64bit Linux value. This means that if we try to set atime to a
value before the epoch (touch -t 196001010101) the client will only send
part of the new value due to lost precision.
Signed-off-by: Bryan Schumaker <[email protected]>
Signed-off-by: Trond Myklebust <[email protected]>
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If we're doing NFSv4.1 against a server that has persistent sessions,
then we should not need to call SETATTR in order to reset the file
attributes immediately after doing an exclusive create.
Note that since the create mode depends on the type of session that
has been negotiated with the server, we should not choose the
mode until after we've got a session slot.
Signed-off-by: Trond Myklebust <[email protected]>
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This ensures that the RPC layer doesn't override the NFS session
negotiation.
Signed-off-by: Trond Myklebust <[email protected]>
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Currently, _nfs4_do_setattr() will use the delegation stateid if no
writeable open file stateid is available.
If the server revokes that delegation stateid, then the call to
nfs4_handle_exception() will fail to handle the error due to the
lack of a struct nfs4_state, and will just convert the error into
an EIO.
This patch just removes the requirement that we must have a
struct nfs4_state in order to invalidate the delegation and
retry.
Reported-by: Andy Adamson <[email protected]>
Signed-off-by: Trond Myklebust <[email protected]>
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Correct spelling typos in printk and comments.
Signed-off-by: Masanari Iida <[email protected]>
Acked-by: Randy Dunlap <[email protected]>
Signed-off-by: Jiri Kosina <[email protected]>
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Otherwise we deadlock if state recovery is initiated while we
sleep.
Signed-off-by: Andy Adamson <[email protected]>
Signed-off-by: Trond Myklebust <[email protected]>
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nfs_delegation_claim_locks
The second check was added in commit 65b62a29 but it will never be true.
Signed-off-by: Jeff Layton <[email protected]>
Signed-off-by: Trond Myklebust <[email protected]>
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Pull another nfs fixlet from Trond Myklebust:
"I suddenly noticed that a one-line issue that I _thought_ I had fixed
with the nfs41_walk_client_list patch was apparently still there in
the pull request I sent earlier today. I'm very sorry for not
catching that in time.
- Fix a brain fart in nfs41_walk_client_list"
* tag 'nfs-for-3.9-5' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
NFSv4: Doh! Typo in the fix to nfs41_walk_client_list
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Make sure that we set the status to 0 on success. Missed in testing
because it never appears when doing multiple mounts to _different_
servers.
Signed-off-by: Trond Myklebust <[email protected]>
Cc: <[email protected]> # 3.7.x: 7b1f1fd: NFSv4/4.1: Fix bugs in nfs4[01]_walk_client_list
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Pull NFS client bugfixes from Trond Myklebust:
- fix for memory corruption issues in nfs4[01]_walk_client_list (stable)
- fix for an Oopsable bug in rpc_clone_client (stable)
- another state manager deadlock in the NFSv4 open code
- memory leaks in nfs4_discover_server_trunking and rpc_new_client
* tag 'nfs-for-3.9-4' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
NFSv4: Fix another potential state manager deadlock
SUNRPC: Fix a potential memory leak in rpc_new_client
NFSv4/4.1: Fix bugs in nfs4[01]_walk_client_list
NFSv4: Fix a memory leak in nfs4_discover_server_trunking
SUNRPC: Remove extra xprt_put()
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Don't hold the NFSv4 sequence id while we check for open permission.
The call to ACCESS may block due to reboot recovery.
Signed-off-by: Trond Myklebust <[email protected]>
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Signed-off-by: Trond Myklebust <[email protected]>
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This will later allow NFS locking code to wait for readahead to complete
before releasing byte range locks.
Signed-off-by: Trond Myklebust <[email protected]>
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When we send a RENEW or SEQUENCE operation in order to probe if the
lease is still valid, we want it to be able to time out since the
lease we are probing is likely to time out too. Currently, because
we use soft mount semantics for these RPC calls, the return value
is EIO, which causes the state manager to exit with an "unhandled
error" message.
This patch changes the call semantics, so that the RPC layer returns
ETIMEDOUT instead of EIO. We then have the state manager default to
a simple retry instead of exiting.
Signed-off-by: Trond Myklebust <[email protected]>
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Signed-off-by: Trond Myklebust <[email protected]>
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Signed-off-by: Trond Myklebust <[email protected]>
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If the state manager thread is already running, we may end up
racing with it in nfs_client_return_marked_delegations. Better to
just allow the state manager thread to do the job.
Signed-off-by: Trond Myklebust <[email protected]>
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Currently, if the application that holds the file open isn't doing
I/O, we may end up returning the delegation. This means that we can
no longer cache the file as aggressively, and often also that we
multiply the state that both the server and the client needs to track.
This patch adds a check for open files to the routine that scans
for delegations that are unreferenced.
Signed-off-by: Trond Myklebust <[email protected]>
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Unify the error handling in nfs4_open_delegation_recall and
nfs4_lock_delegation_recall.
Signed-off-by: Trond Myklebust <[email protected]>
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Make it symmetric with nfs4_lock_delegation_recall
Signed-off-by: Trond Myklebust <[email protected]>
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All error cases are handled by the switch() statement, meaning that the
call to nfs4_handle_exception() is unreachable.
Signed-off-by: Trond Myklebust <[email protected]>
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A server shouldn't normally return NFS4ERR_GRACE if the client holds a
delegation, since no conflicting lock reclaims can be granted, however
the spec does not require the server to grant the open in this
instance
Signed-off-by: Trond Myklebust <[email protected]>
Cc: [email protected]
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A server shouldn't normally return NFS4ERR_GRACE if the client holds a
delegation, since no conflicting lock reclaims can be granted, however
the spec does not require the server to grant the lock in this
instance.
Signed-off-by: Trond Myklebust <[email protected]>
Cc: [email protected]
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The v4.1 callback thread has set_freezable() at the top, but it doesn't
ever try to freeze within the loop. Have it call try_to_freeze() at the
top of the loop. If a freeze event occurs, recheck kthread_should_stop()
after thawing.
Reported-by: Yanchuan Nian <[email protected]>
Signed-off-by: Jeff Layton <[email protected]>
Signed-off-by: Trond Myklebust <[email protected]>
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It is unsafe to use list_for_each_entry_safe() here, because
when we drop the nn->nfs_client_lock, we pin the _current_ list
entry and ensure that it stays in the list, but we don't do the
same for the _next_ list entry. Use of list_for_each_entry() is
therefore the correct thing to do.
Also fix the refcounting in nfs41_walk_client_list().
Finally, ensure that the nfs_client has finished being initialised
and, in the case of NFSv4.1, that the session is set up.
Signed-off-by: Trond Myklebust <[email protected]>
Cc: Chuck Lever <[email protected]>
Cc: Bryan Schumaker <[email protected]>
Cc: [email protected] [>= 3.7]
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When we assign a new rpc_client to clp->cl_rpcclient, we need to destroy
the old one.
Signed-off-by: Trond Myklebust <[email protected]>
Cc: Chuck Lever <[email protected]>
Cc: [email protected] [>=3.7]
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The expected behaviour is that the client will decide at mount time
whether or not to use a krb5i machine cred, or AUTH_NULL.
Signed-off-by: Trond Myklebust <[email protected]>
Cc: Chuck Lever <[email protected]>
Cc: Bryan Schumaker <[email protected]>
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- Ensure that we exit with ENOENT if the call to ops->get_clid_cred()
fails.
- Handle the case where ops->detect_trunking() exits with an
unexpected error, and return EIO.
Signed-off-by: Trond Myklebust <[email protected]>
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If the rpcsec_gss_krb5 module cannot be loaded, the attempt to create
an rpc_client in nfs4_init_client will currently fail with an EINVAL.
Fix is to retry with AUTH_NULL.
Regression introduced by the commit "NFS: Use "krb5i" to establish NFSv4
state whenever possible"
Signed-off-by: Trond Myklebust <[email protected]>
Cc: Chuck Lever <[email protected]>
Cc: Bryan Schumaker <[email protected]>
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Since commit ec88f28d in 2009, checking if the user-specified flavor
is in the server's flavor list has been the source of a few
noticeable regressions (now fixed), but there is one that is still
vexing.
An NFS server can list AUTH_NULL in its flavor list, which suggests
a client should try to mount the server with the flavor of the
client's choice, but the server will squash all accesses. In some
cases, our client fails to mount a server because of this check,
when the mount could have proceeded successfully.
Skip this check if the user has specified "sec=" on the mount
command line. But do consult the server-provided flavor list to
choose a security flavor if no sec= option is specified on the mount
command.
If a server lists Kerberos pseudoflavors before "sys" in its export
options, our client now chooses Kerberos over AUTH_UNIX for mount
points, when no security flavor is specified by the mount command.
This could be surprising to some administrators or users, who would
then need to have Kerberos credentials to access the export.
Or, a client administrator may not have enabled rpc.gssd. In this
case, auth_rpcgss.ko might still be loadable, which is enough for
the new logic to choose Kerberos over AUTH_UNIX. But the mount
would fail since no GSS context can be created without rpc.gssd
running.
To retain the use of AUTH_UNIX by default:
o The server administrator can ensure that "sys" is listed before
Kerberos flavors in its export security options (see
exports(5)),
o The client administrator can explicitly specify "sec=sys" on
its mount command line (see nfs(5)),
o The client administrator can use "Sec=sys" in an appropriate
section of /etc/nfsmount.conf (see nfsmount.conf(5)), or
o The client administrator can blacklist auth_rpcgss.ko.
Signed-off-by: Chuck Lever <[email protected]>
Signed-off-by: Trond Myklebust <[email protected]>
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I had the following problem reported a while back. If you mount the
same filesystem twice using NFSv4 with different contexts, then the
second context= option is ignored. For instance:
# mount server:/export /mnt/test1
# mount server:/export /mnt/test2 -o context=system_u:object_r:tmp_t:s0
# ls -dZ /mnt/test1
drwxrwxrwt. root root system_u:object_r:nfs_t:s0 /mnt/test1
# ls -dZ /mnt/test2
drwxrwxrwt. root root system_u:object_r:nfs_t:s0 /mnt/test2
When we call into SELinux to set the context of a "cloned" superblock,
it will currently just bail out when it notices that we're reusing an
existing superblock. Since the existing superblock is already set up and
presumably in use, we can't go overwriting its context with the one from
the "original" sb. Because of this, the second context= option in this
case cannot take effect.
This patch fixes this by turning security_sb_clone_mnt_opts into an int
return operation. When it finds that the "new" superblock that it has
been handed is already set up, it checks to see whether the contexts on
the old superblock match it. If it does, then it will just return
success, otherwise it'll return -EBUSY and emit a printk to tell the
admin why the second mount failed.
Note that this patch may cause casualties. The NFSv4 code relies on
being able to walk down to an export from the pseudoroot. If you mount
filesystems that are nested within one another with different contexts,
then this patch will make those mounts fail in new and "exciting" ways.
For instance, suppose that /export is a separate filesystem on the
server:
# mount server:/ /mnt/test1
# mount salusa:/export /mnt/test2 -o context=system_u:object_r:tmp_t:s0
mount.nfs: an incorrect mount option was specified
...with the printk in the ring buffer. Because we *might* eventually
walk down to /mnt/test1/export, the mount is denied due to this patch.
The second mount needs the pseudoroot superblock, but that's already
present with the wrong context.
OTOH, if we mount these in the reverse order, then both mounts work,
because the pseudoroot superblock created when mounting /export is
discarded once that mount is done. If we then however try to walk into
that directory, the automount fails for the similar reasons:
# cd /mnt/test1/scratch/
-bash: cd: /mnt/test1/scratch: Device or resource busy
The story I've gotten from the SELinux folks that I've talked to is that
this is desirable behavior. In SELinux-land, mounting the same data
under different contexts is wrong -- there can be only one.
Cc: Steve Dickson <[email protected]>
Cc: Stephen Smalley <[email protected]>
Signed-off-by: Jeff Layton <[email protected]>
Acked-by: Eric Paris <[email protected]>
Signed-off-by: James Morris <[email protected]>
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Currently our client uses AUTH_UNIX for state management on Kerberos
NFS mounts in some cases. For example, if the first mount of a
server specifies "sec=sys," the SETCLIENTID operation is performed
with AUTH_UNIX. Subsequent mounts using stronger security flavors
can not change the flavor used for lease establishment. This might
be less security than an administrator was expecting.
Dave Noveck's migration issues draft recommends the use of an
integrity-protecting security flavor for the SETCLIENTID operation.
Let's ignore the mount's sec= setting and use krb5i as the default
security flavor for SETCLIENTID.
If our client can't establish a GSS context (eg. because it doesn't
have a keytab or the server doesn't support Kerberos) we fall back
to using AUTH_NULL. For an operation that requires a
machine credential (which never represents a particular user)
AUTH_NULL is as secure as AUTH_UNIX.
Signed-off-by: Chuck Lever <[email protected]>
Signed-off-by: Trond Myklebust <[email protected]>
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Most NFSv4 servers implement AUTH_UNIX, and administrators will
prefer this over AUTH_NULL. It is harmless for our client to try
this flavor in addition to the flavors mandated by RFC 3530/5661.
Signed-off-by: Chuck Lever <[email protected]>
Signed-off-by: Trond Myklebust <[email protected]>
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If the Linux NFS client receives an NFS4ERR_WRONGSEC error while
trying to look up an NFS server's root file handle, it retries the
lookup operation with various security flavors to see what flavor
the NFS server will accept for pseudo-fs access.
The list of flavors the client uses during retry consists only of
flavors that are currently registered in the kernel RPC client.
This list may not include any GSS pseudoflavors if auth_rpcgss.ko
has not yet been loaded.
Let's instead use a static list of security flavors that the NFS
standard requires the server to implement (RFC 3530bis, section
3.2.1). The RPC client should now be able to load support for
these dynamically; if not, they are skipped.
Recovery behavior here is prescribed by RFC 3530bis, section
15.33.5:
> For LOOKUPP, PUTROOTFH and PUTPUBFH, the client will be unable to
> use the SECINFO operation since SECINFO requires a current
> filehandle and none exist for these two [sic] operations. Therefore,
> the client must iterate through the security triples available at
> the client and reattempt the PUTROOTFH or PUTPUBFH operation. In
> the unfortunate event none of the MANDATORY security triples are
> supported by the client and server, the client SHOULD try using
> others that support integrity. Failing that, the client can try
> using AUTH_NONE, but because such forms lack integrity checks,
> this puts the client at risk.
Signed-off-by: Chuck Lever <[email protected]>
Cc: Bryan Schumaker <[email protected]>
Signed-off-by: Trond Myklebust <[email protected]>
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Currently, the compound operation the Linux NFS client sends to the
server to confirm a client ID looks like this:
{ SETCLIENTID_CONFIRM; PUTROOTFH; GETATTR(lease_time) }
Once the lease is confirmed, it makes sense to know how long before
the client will have to renew it. And, performing these operations
in the same compound saves a round trip.
Unfortunately, this arrangement assumes that the security flavor
used for establishing a client ID can also be used to access the
server's pseudo-fs.
If the server requires a different security flavor to access its
pseudo-fs than it allowed for the client's SETCLIENTID operation,
the PUTROOTFH in this compound fails with NFS4ERR_WRONGSEC. Even
though the SETCLIENTID_CONFIRM succeeded, our client's trunking
detection logic interprets the failure of the compound as a failure
by the server to confirm the client ID.
As part of server trunking detection, the client then begins another
SETCLIENTID pass with the same nfs4_client_id. This fails with
NFS4ERR_CLID_INUSE because the first SETCLIENTID/SETCLIENTID_CONFIRM
already succeeded in confirming that client ID -- it was the
PUTROOTFH operation that caused the SETCLIENTID_CONFIRM compound to
fail.
To address this issue, separate the "establish client ID" step from
the "accessing the server's pseudo-fs root" step. The first access
of the server's pseudo-fs may require retrying the PUTROOTFH
operation with different security flavors. This access is done in
nfs4_proc_get_rootfh().
That leaves the matter of how to retrieve the server's lease time.
nfs4_proc_fsinfo() already retrieves the lease time value, though
none of its callers do anything with the retrieved value (nor do
they mark the lease as "renewed").
Note that NFSv4.1 state recovery invokes nfs4_proc_get_lease_time()
using the lease management security flavor. This may cause some
heartburn if that security flavor isn't the same as the security
flavor the server requires for accessing the pseudo-fs.
Signed-off-by: Chuck Lever <[email protected]>
Cc: Bryan Schumaker <[email protected]>
Signed-off-by: Trond Myklebust <[email protected]>
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The long lines with no vertical white space make this function
difficult for humans to read. Add a proper documenting comment
while we're here.
Signed-off-by: Chuck Lever <[email protected]>
Cc: Bryan Schumaker <[email protected]>
Signed-off-by: Trond Myklebust <[email protected]>
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When rpc.gssd is not running, any NFS operation that needs to use a
GSS security flavor of course does not work.
If looking up a server's root file handle results in an
NFS4ERR_WRONGSEC, nfs4_find_root_sec() is called to try a bunch of
security flavors until one works or all reasonable flavors have
been tried. When rpc.gssd isn't running, this loop seems to fail
immediately after rpcauth_create() craps out on the first GSS
flavor.
When the rpcauth_create() call in nfs4_lookup_root_sec() fails
because rpc.gssd is not available, nfs4_lookup_root_sec()
unconditionally returns -EIO. This prevents nfs4_find_root_sec()
from retrying any other flavors; it drops out of its loop and fails
immediately.
Having nfs4_lookup_root_sec() return -EACCES instead allows
nfs4_find_root_sec() to try all flavors in its list.
Signed-off-by: Chuck Lever <[email protected]>
Cc: Bryan Schumaker <[email protected]>
Signed-off-by: Trond Myklebust <[email protected]>
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A SECINFO reply may contain flavors whose kernel module is not
yet loaded by the client's kernel. A new RPC client API, called
rpcauth_get_pseudoflavor(), is introduced to do proper checking
for support of a security flavor.
When this API is invoked, the RPC client now tries to load the
module for each flavor first before performing the "is this
supported?" check. This means if a module is available on the
client, but has not been loaded yet, it will be loaded and
registered automatically when the SECINFO reply is processed.
The new API can take a full GSS tuple (OID, QoP, and service).
Previously only the OID and service were considered.
nfs_find_best_sec() is updated to verify all flavors requested in a
SECINFO reply, including AUTH_NULL and AUTH_UNIX. Previously these
two flavors were simply assumed to be supported without consulting
the RPC client.
Note that the replaced version of nfs_find_best_sec() can return
RPC_AUTH_MAXFLAVOR if the server returns a recognized OID but an
unsupported "service" value. nfs_find_best_sec() now returns
RPC_AUTH_UNIX in this case.
Signed-off-by: Chuck Lever <[email protected]>
Signed-off-by: Trond Myklebust <[email protected]>
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The NFSv4 SECINFO procedure returns a list of security flavors. Any
GSS flavor also has a GSS tuple containing an OID, a quality-of-
protection value, and a service value, which specifies a particular
GSS pseudoflavor.
For simplicity and efficiency, I'd like to return each GSS tuple
from the NFSv4 SECINFO XDR decoder and pass it straight into the RPC
client.
Define a data structure that is visible to both the NFS client and
the RPC client. Take structure and field names from the relevant
standards to avoid confusion.
Signed-off-by: Chuck Lever <[email protected]>
Signed-off-by: Trond Myklebust <[email protected]>
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If the server sends us a pathname with more components than the client
limit of NFS4_PATHNAME_MAXCOMPONENTS, more server entries than the client
limit of NFS4_FS_LOCATION_MAXSERVERS, or sends a total number of
fs_locations entries than the client limit of NFS4_FS_LOCATIONS_MAXENTRIES
then we will currently Oops because the limit checks are done _after_ we've
decoded the data into the arrays.
Reported-by: fanchaoting<[email protected]>
Signed-off-by: Trond Myklebust <[email protected]>
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If the open_context for the file is not yet fully initialised,
then open recovery cannot succeed, and since nfs4_state_find_open_context
returns an ENOENT, we end up treating the file as being irrecoverable.
What we really want to do, is just defer the recovery until later.
Signed-off-by: Trond Myklebust <[email protected]>
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With unlink is an asynchronous operation in the sillyrename case, it
expects nfs4_async_handle_error() to map the error correctly.
Signed-off-by: Trond Myklebust <[email protected]>
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