This patch adds auditing of resources used by Virtio RNG devices. Only
resources on the local filesystems are audited.

The audit logs look like:

For the 'random' backend:
type=VIRT_RESOURCE msg=audit(1363099126.643:31): pid=995252 uid=0 auid=4294967295 ses=4294967295 msg='virt=kvm resrc=rng reason=start vm="qcow-test" uuid=118733ed-b658-3e22-a2cb-4fe5cb3ddf79 old-rng="?" new-rng="/dev/random": exe="/home/pipo/libvirt/daemon/.libs/libvirtd" hostname=? addr=? terminal=pts/0 res=success'

For local character device source:
type=VIRT_RESOURCE msg=audit(1363100164.240:96): pid=995252 uid=0 auid=4294967295 ses=4294967295 msg='virt=kvm resrc=rng reason=start vm="qcow-test" uuid=118733ed-b658-3e22-a2cb-4fe5cb3ddf79 old-rng="?" new-rng="/tmp/unix.sock": exe="/home/pipo/libvirt/daemon/.libs/libvirtd" hostname=? addr=? terminal=pts/0 res=success'

To allow the efficient correlation of container audit messages
with host hosts, include the pid namespace inode in audit
messages.

Resolve a couple of instances where variables were not initialized
prior to potential VIR_FREE call in cleanup path.

The <hostdev> device type has long had a redundant "mode"
attribute, which has always been "subsys". This finally
introduces a new mode "capabilities", which will be used
by the LXC driver for device assignment. Since container
based virtualization uses a single kernel, the idea of
assigning physical PCI devices doesn't make sense. It is
still reasonable to assign USB devices, but for assigning
arbitrary nodes in /dev, the new 'capabilities' mode is
to be used.

The first capability support is 'storage', which is for
assignment of block devices. Functionally this is really
pretty similar to the <disk> support. The only difference
is the device node name is identical in both host and
container namespaces.

    <hostdev mode='capabilities' type='storage'>
      <source>
        <block>/dev/sdf1</block>
      </source>
    </hostdev>

The second capability support is 'misc', which is for
assignment of character devices. There is no existing
parallel to this. Again the device node is the same
inside & outside the container.

    <hostdev mode='capabilities' type='misc'>
      <source>
        <char>/dev/input/event3</char>
      </source>
    </hostdev>

The reason for keeping the char & storage devices
separate in the domain XML, is to mirror the split
in the node device XML. NB the node device XML does
not yet report character devices, but that's another
new patch to come
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Currently the LXC driver logs audit messages when a container
is started or stopped. These audit messages, however, contain
the PID of the libvirt_lxc supervisor process. To enable
sysadmins to correlate with audit messages generated by
processes /inside/ the container, we need to include the
container init process PID.

We can't do this in the main 'start' audit message, since
the init PID is not available at that point. Instead we output
a completely new audit record, that lists both PIDs.

type=VIRT_CONTROL msg=audit(1353433750.071:363): pid=20180 uid=0 auid=501 ses=3 subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 msg='virt=lxc op=init vm="busy" uuid=dda7b947-0846-1759-2873-0f375df7d7eb vm-pid=20371 init-pid=20372 exe="/home/berrange/src/virt/libvirt/daemon/.libs/lt-libvirtd" hostname=? addr=? terminal=pts/6 res=success'
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

https://www.gnu.org/licenses/gpl-howto.html recommends that
the 'If not, see <url>.' phrase be a separate sentence.

* tests/securityselinuxhelper.c: Remove doubled line.
* tests/securityselinuxtest.c: Likewise.
* globally: s/;  If/.  If/

This patch updates the structures that store information about each
domain and each hypervisor to support multiple security labels and
drivers. It also updates all the remaining code to use the new fields.
Signed-off-by: NMarcelo Cerri <mhcerri@linux.vnet.ibm.com>

Per the FSF address could be changed from time to time, and GNU
recommends the following now: (http://www.gnu.org/licenses/gpl-howto.html)

  You should have received a copy of the GNU General Public License
  along with Foobar.  If not, see <http://www.gnu.org/licenses/>.

This patch removes the explicit FSF address, and uses above instead
(of course, with inserting 'Lesser' before 'General').

Except a bunch of files for security driver, all others are changed
automatically, the copyright for securify files are not complete,
that's why to do it manually:

  src/security/security_selinux.h
  src/security/security_driver.h
  src/security/security_selinux.c
  src/security/security_apparmor.h
  src/security/security_apparmor.c
  src/security/security_driver.c

Introduce new members in the virMacAddr 'class'
- virMacAddrSet: set virMacAddr from a virMacAddr
- virMacAddrSetRaw: setting virMacAddr from raw 6 byte MAC address buffer
- virMacAddrGetRaw: writing virMacAddr into raw 6 byte MAC address buffer
- virMacAddrCmp: comparing two virMacAddr
- virMacAddrCmpRaw: comparing a virMacAddr with a raw 6 byte MAC address buffer

then replace raw MAC addresses by replacing

- 'unsigned char *' with virMacAddrPtr
- 'unsigned char ... [VIR_MAC_BUFLEN]' with virMacAddr

and introduce usage of above functions where necessary.

The ignore_value macro is used across libvirt. This patch includes it in
the internal header and cleans all other includes.

Fix a few more places where pid_t is printed with wrong type

Using 'unsigned long' for memory values is risky on 32-bit platforms,
as a PAE guest can have more than 4GiB memory.  Our API is
(unfortunately) locked at 'unsigned long' and a scale of 1024, but
the rest of our system should consistently use 64-bit values,
especially since the previous patch centralized overflow checking.

* src/conf/domain_conf.h (_virDomainDef): Always use 64-bit values
for memory.  Change hugepage_backed to a bool.
* src/conf/domain_conf.c (virDomainDefParseXML)
(virDomainDefCheckABIStability, virDomainDefFormatInternal): Fix
clients.
* src/vmx/vmx.c (virVMXFormatConfig): Likewise.
* src/xenxs/xen_sxpr.c (xenParseSxpr, xenFormatSxpr): Likewise.
* src/xenxs/xen_xm.c (xenXMConfigGetULongLong): New function.
(xenXMConfigGetULong, xenXMConfigSetInt): Avoid truncation.
(xenParseXM, xenFormatXM): Fix clients.
* src/phyp/phyp_driver.c (phypBuildLpar): Likewise.
* src/openvz/openvz_driver.c (openvzDomainSetMemoryInternal):
Likewise.
* src/vbox/vbox_tmpl.c (vboxDomainDefineXML): Likewise.
* src/qemu/qemu_command.c (qemuBuildCommandLine): Likewise.
* src/qemu/qemu_process.c (qemuProcessStart): Likewise.
* src/qemu/qemu_monitor.h (qemuMonitorGetBalloonInfo): Likewise.
* src/qemu/qemu_monitor_text.h (qemuMonitorTextGetBalloonInfo):
Likewise.
* src/qemu/qemu_monitor_text.c (qemuMonitorTextGetBalloonInfo):
Likewise.
* src/qemu/qemu_monitor_json.h (qemuMonitorJSONGetBalloonInfo):
Likewise.
* src/qemu/qemu_monitor_json.c (qemuMonitorJSONGetBalloonInfo):
Likewise.
* src/qemu/qemu_driver.c (qemudDomainGetInfo)
(qemuDomainGetXMLDesc): Likewise.
* src/uml/uml_conf.c (umlBuildCommandLine): Likewise.

Some audit records generated by libvirt contain fields enclosed by single
quotes. Since those fields are inside the msg field, which is enclosed by
single quotes, these records generated by libvirt are not correctly parsed by
libauparse.

Rename virFormatMacAddr, virGenerateMacAddr and virParseMacAddr
to virMacAddrFormat, virMacAddrGenerate and virMacAddrParse
respectively

Added a new field "vm-pid" to the VIRT_CONTROL audit record. This information
is useful to correlated another audit events to the events generated by
libvirt.

/usr/lib/stdlib.h in Mac OS X and probably also in BSD's
exports this symbol :(

Also initialize to NULL a few variables that might get
free before being set.

Snapshots alter the set of disk image files opened by qemu, so
they must be audited.  But they don't involve a full disk definition
structure, just the new filename.  Make the next patch easier by
refactoring the audit routines to just operate on file name.

* src/conf/domain_audit.h (virDomainAuditDisk): Update prototype.
* src/conf/domain_audit.c (virDomainAuditDisk): Act on strings,
not definition structures.
(virDomainAuditStart): Update caller.
* src/qemu/qemu_hotplug.c (qemuDomainChangeEjectableMedia)
(qemuDomainAttachPciDiskDevice, qemuDomainAttachSCSIDisk)
(qemuDomainAttachUsbMassstorageDevice)
(qemuDomainDetachPciDiskDevice, qemuDomainDetachDiskDevice):
Likewise.

- create a new "redirdev" element for this purpose

Coverity complained that 395 out of 409 virAsprintf calls are
checked, and therefore assumed that the remaining cases are bugs
waiting to happen.  But in each of these cases, a failed virAsprintf
will properly set the target string to NULL, and pass on that
failure to the caller, without wasting efforts to check the call.
Adding the ignore_value silences Coverity.

* src/conf/domain_audit.c (virDomainAuditGetRdev): Ignore
virAsprintf return value, when it behaves like we need.
* src/network/bridge_driver.c (networkDnsmasqLeaseFileNameDefault)
(networkRadvdConfigFileName, networkBridgeDummyNicName)
(networkRadvdPidfileBasename): Likewise.
* src/util/storage_file.c (absolutePathFromBaseFile): Likewise.
* src/openvz/openvz_driver.c (openvzGenerateContainerVethName):
Likewise.
* src/util/command.c (virCommandTranslateStatus): Likewise.

Since a host can run several different virtualization types at
the same time, audit messages should allow domains to be identified.
Add a 'virt={qemu,kvm,uml,lxc,...}' key to domain audit messages

* src/conf/domain_audit.c: Identify virt type of guest

When passing through filesystems from the host to a guest, the
host filesystem passed must be audited

* src/conf/domain_audit.{c,h}: Add virDomainAuditFS

The LXC and UML drivers can both make use of auditing. Move
the qemu_audit.{c,h} files to src/conf/domain_audit.{c,h}

* src/conf/domain_audit.c: Rename from src/qemu/qemu_audit.c
* src/conf/domain_audit.h: Rename from src/qemu/qemu_audit.h
* src/Makefile.am: Remove qemu_audit.{c,h}, add domain_audit.{c,h}
* src/qemu/qemu_audit.h, src/qemu/qemu_cgroup.c,
  src/qemu/qemu_command.c, src/qemu/qemu_driver.c,
  src/qemu/qemu_hotplug.c, src/qemu/qemu_migration.c,
  src/qemu/qemu_process.c: Update for changed audit API names

* src/util/virtaudit.[ch]: Rename...
* src/util/viraudit.[ch]: ...to match virAudit* API.
* src/Makefile.am (UTIL_SOURCES): Reflect rename.
* daemon/libvirtd.c: Likewise.
* po/POTFILES.in: Likewise.
* src/libvirt_private.syms: Likewise.
* src/qemu/qemu_audit.c: Likewise.

Coverity warns if the majority of callers check a function for
errors, but a few don't; but in qemu_audit and qemu_domain, the
choice to not check for failures was safe.  In qemu_command, the
failure to generate a uuid can only occur on a bad pointer.

* src/qemu/qemu_audit.c (qemuAuditCgroup): Ignore failure to get
  cgroup controller.
* src/qemu/qemu_domain.c (qemuDomainObjEnterMonitor)
  (qemuDomainObjEnterMonitorWithDriver): Ignore failure to get
  timestamp.
* src/qemu/qemu_command.c (qemuParseCommandLine): Check for error.

These VIR_XXXX0 APIs make us confused, use the non-0-suffix APIs instead.

How do these coversions works? The magic is using the gcc extension of ##.
When __VA_ARGS__ is empty, "##" will swallow the "," in "fmt," to
avoid compile error.

example: origin				after CPP
	high_level_api("%d", a_int)	low_level_api("%d", a_int)
	high_level_api("a  string")	low_level_api("a  string")

About 400 conversions.

8 special conversions:
VIR_XXXX0("") -> VIR_XXXX("msg") (avoid empty format) 2 conversions
VIR_XXXX0(string_literal_with_%) -> VIR_XXXX(%->%%) 0 conversions
VIR_XXXX0(non_string_literal) -> VIR_XXXX("%s", non_string_literal)
  (for security) 6 conversions
Signed-off-by: NLai Jiangshan <laijs@cn.fujitsu.com>

Opening raw network devices with the intent of passing those fds to
qemu is worth an audit point.  This makes a multi-part audit: first,
we audit the device(s) that libvirt opens on behalf of the MAC address
of a to-be-created interface (which can independently succeed or
fail), then we audit whether qemu actually started the network device
with the same MAC (so searching backwards for successful audits with
the same MAC will show which fd(s) qemu is actually using).  Note that
it is possible for the fd to be successfully opened but no attempt
made to pass the fd to qemu (for example, because intermediate
nwfilter operations failed) - no interface start audit will occur in
that case; so the audit for a successful opened fd does not imply
rights given to qemu unless there is a followup audit about the
attempt to start a new interface.

Likewise, when a network device is hot-unplugged, there is only one
audit message about the MAC being discontinued; again, searching back
to the earlier device open audits will show which fds that qemu quits
using (and yes, I checked via /proc/<qemu-pid>/fd that qemu _does_
close out the fds associated with an interface on hot-unplug).  The
code would require much more refactoring to be able to definitively
state which device(s) were discontinued at that point, since we
currently don't record anywhere in the XML whether /dev/vhost-net was
opened for a given interface.

* src/qemu/qemu_audit.h (qemuAuditNetDevice): New prototype.
* src/qemu/qemu_audit.c (qemuAuditNetDevice): New function.
* src/qemu/qemu_command.h (qemuNetworkIfaceConnect)
(qemuPhysIfaceConnect, qemuOpenVhostNet): Adjust prototype.
* src/qemu/qemu_command.c (qemuNetworkIfaceConnect)
(qemuPhysIfaceConnect, qemuOpenVhostNet): Add audit points and
adjust parameters.
(qemuBuildCommandLine): Adjust caller.
* src/qemu/qemu_hotplug.c (qemuDomainAttachNetDevice): Likewise.

* src/qemu/qemu_audit.h (qemuAuditCgroupMajor)
(qemuAuditCgroupPath): Add parameter.
* src/qemu/qemu_audit.c (qemuAuditCgroupMajor)
(qemuAuditCgroupPath): Add 'acl=rwm' to cgroup audit entries.
* src/qemu/qemu_cgroup.c: Update clients.
* src/qemu/qemu_driver.c (qemudDomainSaveFlag): Likewise.

Also add ATTRIBUTE_NONNULL markers.

* src/qemu/qemu_audit.h: The pattern qemuDomainXXXAudit is
inconsistent; prefer qemuAuditXXX instead.
* src/qemu/qemu_audit.c: Reflect the renames.
* src/qemu/qemu_driver.c: Likewise.
* src/qemu/qemu_hotplug.c: Likewise.
* src/qemu/qemu_migration.c: Likewise.
* src/qemu/qemu_process.c: Likewise.

Although the cgroup device ACL controller path can be worked out
by researching the code, it is more efficient to include that
information directly in the audit message.

* src/util/cgroup.h (virCgroupPathOfController): New prototype.
* src/util/cgroup.c (virCgroupPathOfController): Export.
* src/libvirt_private.syms: Likewise.
* src/qemu/qemu_audit.c (qemuAuditCgroup): Use it.

Device names can be manipulated, so it is better to also log
the major/minor device number corresponding to the cgroup ACL
changes that libvirt made.  This required some refactoring
of the relatively new qemu cgroup audit code.

Also, qemuSetupChardevCgroup was only auditing on failure, not success.

* src/qemu/qemu_audit.h (qemuDomainCgroupAudit): Delete.
(qemuAuditCgroup, qemuAuditCgroupMajor, qemuAuditCgroupPath): New
prototypes.
* src/qemu/qemu_audit.c (qemuDomainCgroupAudit): Rename...
(qemuAuditCgroup): ...and drop a parameter.
(qemuAuditCgroupMajor, qemuAuditCgroupPath): New functions, to
allow listing device major/minor in audit.
(qemuAuditGetRdev): New helper function.
* src/qemu/qemu_driver.c (qemudDomainSaveFlag): Adjust callers.
* src/qemu/qemu_cgroup.c (qemuSetupDiskPathAllow)
(qemuSetupHostUsbDeviceCgroup, qemuSetupCgroup)
(qemuTeardownDiskPathDeny): Likewise.
(qemuSetupChardevCgroup): Likewise, fixing missing audit.

* src/qemu/qemu_audit.c (qemuDomainHostdevAudit): Avoid use of
"type", which has a pre-defined meaning.
(qemuDomainCgroupAudit): Likewise, as well as "item".

* src/qemu/qemu_audit.h (qemuDomainHostdevAudit): New prototype.
* src/qemu/qemu_audit.c (qemuDomainHostdevAudit): New function.
(qemuDomainStartAudit): Call as appropriate.
* src/qemu/qemu_hotplug.c (qemuDomainAttachHostPciDevice)
(qemuDomainAttachHostUsbDevice, qemuDomainDetachHostPciDevice)
(qemuDomainDetachHostUsbDevice): Likewise.

* src/qemu/qemu_audit.h (qemuDomainMemoryAudit)
(qemuDomainVcpuAudit): New prototypes.
* src/qemu/qemu_audit.c (qemuDomainResourceAudit)
(qemuDomainMemoryAudit, qemuDomainVcpuAudit): New functions.
(qemuDomainStartAudit): Call as appropriate.
* src/qemu/qemu_driver.c (qemudDomainSetMemory)
(qemudDomainHotplugVcpus): Likewise.

* src/qemu/qemu_audit.h (qemuDomainCgroupAudit): New prototype.
* src/qemu/qemu_audit.c (qemuDomainCgroupAudit): Implement it.
* src/qemu/qemu_driver.c (qemudDomainSaveFlag): Add audit.
* src/qemu/qemu_cgroup.c (qemuSetupDiskPathAllow)
(qemuSetupChardevCgroup, qemuSetupHostUsbDeviceCgroup)
(qemuSetupCgroup, qemuTeardownDiskPathDeny): Likewise.

The QEMU driver file is far too large. Move all the audit
helper code out into a separate file. No functional change.

* src/qemu/qemu_audit.c, src/qemu/qemu_audit.h,
  src/Makefile.am: Add audit helper file
* src/qemu/qemu_driver.c: Delete audit code