Commit Graph

21 Commits

Author SHA1 Message Date
Peter Krempa
67c345cb97 qemusecuritytest: Store 'notRestored' files in a hash table
The validation code looks whether certain paths are in the 'notRestored'
list. For the purpose of lookup it's better to use a hash table rather
than a string list.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
2021-02-11 17:05:33 +01:00
Michal Privoznik
b7d4e6b67e lib: Replace VIR_AUTOSTRINGLIST with GStrv
Glib provides g_auto(GStrv) which is in-place replacement of our
VIR_AUTOSTRINGLIST.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
2020-12-02 15:43:07 +01:00
Michal Privoznik
995394c5a3 qemusecuritytest: Skip on non supported platforms
For seclabel remembering we need to have XATTRs and a special
namespace that is accessibly to CAP_SYS_ADMIN only (we don't want
regular users to trick us into restoring to a different label).
And what qemusecuritytest does is it checks whether we have not
left any path behind with XATTRs or not restored to original
seclabel after setAll + restoreAll round trip. But it can hardly
do so if ran on a platform where there's no XATTR namespace we
can use.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Roman Bolshakov <r.bolshakov@yadro.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>
2020-11-06 09:14:53 +01:00
Michal Privoznik
df8ff46a16 qemusecuritytest: Test SELinux too
The qemusecuritytest checks for random domain XMLs from
qemuxml2argvdata/ whether set+restore seclabels leaves something
behind. It can be an XATTR that we forgot to remove or a file
that the owner was not restored on. But so far only DAC driver is
checked. Implement missing pieces and enable SELinux testing too.

This is done by mocking some libselinux APIs and following the
same logic used for DAC - everything is implemented in memory,
there is new hash table introduced that holds SELinux labels for
paths that were setfilecon_raw()-ed and in the end the hash table
is checked for entries that don't have the default SELinux label
(i.e. were not restored).

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>
2020-11-06 09:14:01 +01:00
Peter Krempa
e34097750a tests: qemu: Split NBD and VXHS protocol tests
QEMU is going to drop 'vxhs' in the upcoming release so we'll need to
track these separately to prevent test suite breakage.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
2020-07-31 10:27:50 +02:00
Daniel P. Berrangé
4ab2120f3b src: remove virFilePrintf in favour of g_fprintf
The virFilePrintf function was a wrapper for fprintf() to provide
Windows portability, since gnulib's fprintf() replacement was
license restricted. This is no longer needed now we have the
g_fprintf function available.

Reviewed-by: Pavel Hrdina <phrdina@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2020-02-04 14:00:45 +00:00
Daniel P. Berrangé
2c33532423 src: switch to use g_setenv/g_unsetenv
Eliminate direct use of normal setenv/unsetenv calls in
favour of GLib's wrapper. This eliminates two gnulib
modules

Reviewed-by: Fabiano Fidêncio <fidencio@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2020-01-03 15:42:12 +00:00
Daniel P. Berrangé
bf9d812956 conf: drop virCapsPtr param from domain parse APIs
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2019-12-09 10:17:27 +00:00
Michal Privoznik
9e4445ebc3 tests: Mock access to /dev/kvm
Some of our tests try to validate domain XMLs they are working
with (not intentionally, simply because they call top level
domain XML parse function). Anyway, this implies that we build
domain capabilities also - see
virQEMUDriverGetDomainCapabilities(). And since some domain XMLs
are type of 'kvm' the control gets through
virQEMUCapsFillDomainCaps() and virHostCPUGetKVMMaxVCPUs() to
opening /dev/kvm which may be missing on the machine we're
running 'make check'.

Previously, we did not see this issue, because it was masked. If
building domain capabilities failed for whatever reason, we
ignored the failure. Only v5.9.0-207-gc69e6edea3 uncovered the
problem (it changed reval from 0 to -1 if
virQEMUDriverGetDomainCapabilities() fails). Since the referenced
commit is correct, we need to mock access to /dev/kvm in our
tests.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
2019-11-15 11:56:46 +01:00
Michal Privoznik
4fa804c0c7 tests: Use g_strdup_printf() instead of virAsprintf()
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
2019-11-12 16:15:59 +01:00
Ján Tomko
b6108a04ea Use g_steal_pointer instead of VIR_STEAL_PTR everywhere
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
2019-10-16 15:59:42 +02:00
Ján Tomko
2b390b97b4 Use g_autoptr instead of VIR_AUTOUNREF
Now that all the types using VIR_AUTOUNREF have a cleanup func defined
to virObjectUnref, use g_autoptr instead of VIR_AUTOUNREF.

Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
2019-10-16 12:06:44 +02:00
Ján Tomko
1e2ae2e311 Use g_autofree instead of VIR_AUTOFREE
Since commit 44e7f02915
    util: rewrite auto cleanup macros to use glib's equivalent

VIR_AUTOFREE is just an alias for g_autofree. Use the GLib macros
directly instead of our custom aliases.

Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
2019-10-16 12:06:43 +02:00
Michal Privoznik
458d0a8c52 security: Pass @migrated to virSecurityManagerSetAllLabel
In upcoming commits, virSecurityManagerSetAllLabel() will perform
rollback in case of failure by calling
virSecurityManagerRestoreAllLabel(). But in order to do that, the
former needs to have @migrated argument so that it can be passed
to the latter.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Cole Robinson <crobinso@redhat.com>
2019-10-14 17:14:13 +02:00
Michal Privoznik
8b1660e530 security: Don't remember owner for shared resources
This effectively reverts d7420430ce and adds new code.

Here is the problem: Imagine a file X that is to be shared
between two domains as a disk. Let the first domain (vm1) have
seclabel remembering turned on and the other (vm2) has it turned
off. Assume that both domains will run under the same user, but
the original owner of X is different (i.e. trying to access X
without relabelling leads to EPERM).

Let's start vm1 first. This will cause X to be relabelled and to
gain new attributes:

  trusted.libvirt.security.ref_dac="1"
  trusted.libvirt.security.dac="$originalOwner"

When vm2 is started, X will again be relabelled, but since the
new label is the same as X already has (because of vm1) nothing
changes and vm1 and vm2 can access X just fine. Note that no
XATTR is changed (especially the refcounter keeps its value of 1)
because the vm2 domain has the feature turned off.

Now, vm1 is shut off and vm2 continues running. In seclabel
restore process we would get to X and since its refcounter is 1
we would restore the $originalOwner on it. But this is unsafe to
do because vm2 is still using X (remember the assumption that
$originalOwner and vm2's seclabel are distinct?).

The problem is that refcounter stored in XATTRs doesn't reflect
the actual times a resource is in use. Since I don't see any easy
way around it let's just not store original owner on shared
resources. Shared resource in world of domain disks is:

  - whole backing chain but the top layer,
  - read only disk (we don't require CDROM to be explicitly
    marked as shareable),
  - disk marked as shareable.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
2019-07-03 08:36:04 +02:00
Michal Privoznik
760fa05436 qemusecuritymock: Allow some paths to be not restored
Some paths will not be restored. Because we can't possibly know
if they are still in use or not. Reflect this in the test so that
we can test more domains. Also see next commit for more detailed
explanation.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
2019-07-03 08:36:04 +02:00
Michal Privoznik
90540a37be qemusecuritytest: Fix capabilities loading
Having to enumerate all capabilities that we want domain to have
is too verbose and prevents us from adding more tests. Have the
domain always have the latest x86_64 capabilities. This means
that we have to drop two arm tests, but on the other hand, I'm
introducing 50 new cases. I've listed 50 biggest .args files and
added those:

  libvirt.git $ ls -Sr $(find tests/qemuxml2argvdata/ \
  -type f -iname "*.x86_64-latest.args") | tail -n 50

Except for two:
1) disk-backing-chains-noindex - this XML has some disks with
backing chain. And since set is done on the whole backing chain
and restore only on the top layer this would lead to instant test
failure. Don't worry, secdrivers will be fixed shortly too and
the test case will be added.

2) hostdev-mdev-display-spice-egl-headless - for this XML
secdriver tries to find IOMMU group that mdev lives in. Since we
are not mocking sysfs access this test case would fail.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
2019-07-03 08:36:03 +02:00
Michal Privoznik
3c02d383f9 qemusecuritytest: Use AUTOFREE/AUTOUNREF
This simplifies the code a bit and removes the need for cleanup
label in one case. In the other case the label is kept because
it's going to be used later.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
2019-07-03 08:36:03 +02:00
Michal Privoznik
1d34d2462e qemusecuritytest: Drop unused variable
The @securityManager variable in testDomain() is unused. Drop it.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
2019-07-03 08:36:03 +02:00
Michal Privoznik
8ffb5f2738 qemusecuritymock: Introduce and use freePaths()
Problem with current approach is that if
qemuSecuritySetAllLabel() fails, then the @chown_paths and
@xattr_paths hash tables are not freed and preserve values
already stored there into the next test case.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
2019-07-03 08:36:03 +02:00
Michal Privoznik
1e63dea999 tests: Introduce qemusecuritytest
This test checks if security label remembering works correctly.
It uses qemuSecurity* APIs to do that. And some mocking (even
though it's not real mocking as we are used to from other tests
like virpcitest). So far, only DAC driver is tested.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
2018-12-19 15:32:43 +01:00