kernel access control.
Instrument the interface management code so that MAC labels are
properly maintained on network interfaces (struct ifnet). In
particular, invoke entry points when interfaces are created and
removed. MAC policies may initialized the label interface based
on a variety of factors, including the interface name.
Obtained from: TrustedBSD Project
Sponsored by: DARPA, NAI Labs
kernel access control.
When decompressing data from one mbuf into another mbuf, preserve the
mbuf label by copying it to the new mbuf.
Obtained from: TrustedBSD Project
Sponsored by: DARPA, NAI Labs
kernel access control.
Invoke a MAC framework entry point to authorize reception of an
incoming mbuf by the BPF descriptor, permitting MAC policies to
limit the visibility of packets delivered to particular BPF
descriptors.
Obtained from: TrustedBSD Project
Sponsored by: DARPA, NAI Labs
kernel access control.
Instrument BPF so that MAC labels are properly maintained on BPF
descriptors. MAC framework entry points are invoked at BPF
instantiation and allocation, permitting the MAC framework to
derive the BPF descriptor label from the credential authorizing
the device open. Also enter the MAC framework to label mbufs
created using the BPF device.
Obtained from: TrustedBSD Project
Sponsored by: DARPA, NAI Labs
kernel access control.
Instrument UFS to support per-inode MAC labels. In particular,
invoke MAC framework entry points for generically supporting the
backing of MAC labels into extended attributes. This ends up
introducing new vnode operation vector entries point at the MAC
framework entry points, as well as some explicit entry point
invocations for file and directory creation events so that the
MAC framework can push labels to disk before the directory names
become persistent (this will work better once EAs in UFS2 are
hooked into soft updates). The generic EA MAC entry points
support executing with the file system in either single label
or multilabel operation, and will fall back to the mount label
if multilabel is not specified at mount-time.
Obtained from: TrustedBSD Project
Sponsored by: DARPA, NAI Labs
kernel access control.
Instrument devfs to support per-dirent MAC labels. In particular,
invoke MAC framework when devfs directory entries are instantiated
due to make_dev() and related calls, and invoke the MAC framework
when vnodes are instantiated from these directory entries. Implement
vop_setlabel() for devfs, which pushes the label update into the
devfs directory entry for semi-persistant store. This permits the MAC
framework to assign labels to devices and directories as they are
instantiated, and export access control information via devfs vnodes.
Obtained from: TrustedBSD Project
Sponsored by: DARPA, NAI Labs
debugging levels to off by default. Now that debug levels can be
tweaked by sysctl we don't need to go through hoops to get the
different usb parts to produce debug data.
sysctl purposes. Also add two fields to struct vnode, v_cachedfs and
v_cachedid, which hold the vnode's device and file id and are filled in
by vn_open_cred() and vn_stat().
Sponsored by: DARPA, NAI Labs
kernel access control.
Invoke the necessary MAC entry points to maintain labels on sockets.
In particular, invoke entry points during socket allocation and
destruction, as well as creation by a process or during an
accept-scenario (sonewconn). For UNIX domain sockets, also assign
a peer label. As the socket code isn't locked down yet, locking
interactions are not yet clear. Various protocol stack socket
operations (such as peer label assignment for IPv4) will follow.
Obtained from: TrustedBSD Project
Sponsored by: DARPA, NAI Labs
kernel access control.
Invoke the necessary MAC entry points to maintain labels on vnodes.
In particular, initialize the label when the vnode is allocated or
reused, and destroy the label when the vnode is going to be released,
or reused. Wow, an object where there really is exactly one place
where it's allocated, and one other where it's freed. Amazing.
Obtained from: TrustedBSD Project
Sponsored by: DARPA, NAI Labs
kernel access control.
Invoke additional MAC entry points when an mbuf packet header is
copied to another mbuf: release the old label if any, reinitialize
the new header, and ask the MAC framework to copy the header label
data. Note that this requires a potential allocation operation,
but m_copy_pkthdr() is not permitted to fail, so we must block.
Since we now use interrupt threads, this is possible, but not
desirable.
Obtained from: TrustedBSD Project
Sponsored by: DARPA, NAI Labs
kernel access control.
Invoke the necessary MAC entry points to maintain labels on header
mbufs. In particular, invoke entry points during the two mbuf
header allocation cases, and the mbuf freeing case. Pass the "how"
argument at allocation time to the MAC framework so that it can
determine if it is permitted to block (as with policy modules),
and permit the initialization entry point to fail if it needs to
allocate memory but is not permitted to, failing the mbuf
allocation.
Obtained from: TrustedBSD Project
Sponsored by: DARPA, NAI Labs
kernel access control.
Implement MAC framework access control entry points relating to
operations on mountpoints. Currently, this consists only of
access control on mountpoint listing using the various statfs()
variations. In the future, it might also be desirable to
implement checks on mount() and unmount().
Obtained from: TrustedBSD Project
Sponsored by: DARPA, NAI Labs
kernel access control.
Invoke the necessary MAC entry points to maintain labels on
mount structures. In particular, invoke entry points for
intialization and destruction in various scenarios (root,
non-root). Also introduce an entry point in the boot procedure
following the mount of the root file system, but prior to the
start of the userland init process to permit policies to
perform further initialization.
Obtained from: TrustedBSD Project
Sponsored by: DARPA, NAI Labs
kernel access control.
Implement inter-process access control entry points for the MAC
framework. This permits policy modules to augment the decision
making process for process and socket visibility, process debugging,
re-scheduling, and signaling.
Obtained from: TrustedBSD Project
Sponsored by: DARPA, NAI Labs
kernel access control.
Invoke the necessary MAC entry points to maintain labels on
process credentials. In particular, invoke entry points for
the initialization and destruction of struct ucred, the copying
of struct ucred, and permit the initial labels to be set for
both process 0 (parent of all kernel processes) and process 1
(parent of all user processes).
Obtained from: TrustedBSD Project
Sponsored by: DARPA, NAI Labs
the number of policy slots to 4.
(Having run a quick errand, time to start on phase 2 of the MAC
integration)
Obtained from: TrustedBSD Project
Sponsored by: DARPA, NAI Labs
frees it again. The idea was to perform M_WAITOK allocations in a
process context to reduce the risk of later interrupt-context
M_NOWAIT allocations failing, but in fact this code can be called
from contexts where it is not desirable to sleep (e.g. if_start
routines), so it causes lots of witness "could sleep" warnings.
kernel access control.
Label IP fragment reassembly queues, permitting security features to
be maintained on those objects. ipq_label will be used to manage
the reassembly of fragments into IP datagrams using security
properties. This permits policies to deny the reassembly of fragments,
as well as influence the resulting label of a datagram following
reassembly.
Obtained from: TrustedBSD Project
Sponsored by: DARPA, NAI Labs
kernel access control.
Label network interface structures, permitting security features to
be maintained on those objects. if_label will be used to authorize
data flow using the network interface. if_label will be protected
using the same synchronization primitives as other mutable entries
in struct ifnet.
Obtained from: TrustedBSD Project
Sponsored by: DARPA, NAI Labs
kernel access control.
Label BPF descriptor objects, permitting security features to be
maintained on those objects. bd_label will be used to authorize
data flow from network interfaces to user processes. BPF
labels are protected using the same synchronization model as other
mutable data in the BPF descriptor.
Obtained from: TrustedBSD Project
Sponsored by: DARPA, NAI Labs
