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From: Harald Hoyer <harald@redhat.com>
PR_CAPBSET_DROP can return EINVAL, if an older kernel does support
some capabilities, which are defined by CAP_LAST_CAP, which results in
a failure of the service.
For example kernel 3.4 errors on CAP_EPOLLWAKEUP, which was newly
introduced in 3.5.
So, for future capabilities, we clear until we get an EINVAL for
PR_CAPBSET_READ.
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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As a long running daemon, we need to be security-conscious with nfsdcld,
so let's prune what it can do down to nearly nothing.
We want the daemon to run as root so that it has access to open and
reopen the rpc_pipefs pipe, but we don't actually need any of the
superuser caps that come with it. Have it drop all capabilities early
on. We don't need any of them as long as the fsuid continues to be 0.
Once we do that though, check to ensure that the db dir is actually
usable by root w/o CAP_DAC_OVERRIDE. Do an access() check on it and
throw a warning if it's not. Hopefully that will assist users in
debugging if they get the ownership of the DB dir wrong.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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It's actually expected that this will fail initially when we start the
daemon. Until knfsd has been started, the pipe doesn't exist, and we
generally want to start nfsdcld before starting knfsd.
Avoid the scary error message by demoting this message to D_GENERAL.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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- Added header clean up some warnings
- Updated the .gitignore file.
Signed-off-by: Steve Dickson <steved@redhat.com>
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Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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Before opening the pipe, set an inotify watch on the containing dir and
then try to open the pipe. If it succeeds, then set up pipe and inotify
events and return success. If it fails with -ENOENT, then just set up
the inotify event and return success. If it fails with any other error
then return the error and the caller can then abort the program.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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This should remove any client record that has a timestamp prior to
the given time.
Eventually, this call will need to be made cluster aware when this is
run in a clustered configuration. For now, this is only suitable for
single-host configurations.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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Add functions to check whether a client is allowed to reclaim, and
update its timestamp in the DB if so. If either the query or update
fails, then the host is not allowed to reclaim state.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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Allow the kernel to ask for removal of a client record.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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Rather than roll our own "storage engine", use sqlite instead. It fits
the bill nicely as it does:
- durable on-disk storage
- the ability to constrain record uniqueness
- a facility for collating and searching the host records
...it does add a build dependency to nfs-utils, but almost all modern
distros provide those packages.
The current incarnation of this code dynamically links against a
provided sqlite library, but we could also consider including their
single-file "amalgamation" to reduce dependencies (though with all
the caveats that that entails).
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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This program opens and "listens" on the new nfsd/cld rpc_pipefs pipe.
The code here doesn't actually do anything on stable storage yet. That
will be added in a later patch.
The patch also adds a autoconf enable switch for the new daemon that
defaults to "no", and a test for the upcall description header file.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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