Having per policy ns interface files helps with containers restoring
policy.

Signed-off-by: John Johansen <john.johansen@canonical.com>

This is just setup for new ns specific .load, .replace, .remove interface
files.

Signed-off-by: John Johansen <john.johansen@canonical.com>

Verify that profiles in a load set specify the same policy ns and
audit the name of the policy ns that policy is being loaded for.

Signed-off-by: John Johansen <john.johansen@canonical.com>

Store loaded policy and allow introspecting it through apparmorfs. This
has several uses from debugging, policy validation, and policy checkpoint
and restore for containers.

Signed-off-by: John Johansen <john.johansen@canonical.com>

Signed-off-by: John Johansen <john.johansen@canonical.com>

Policy management will be expanded beyond traditional unconfined root.
This will require knowning the profile of the task doing the management
and the ns view.

Signed-off-by: John Johansen <john.johansen@canonical.com>

Prepare for a tighter pairing of user namespaces and apparmor policy
namespaces, by making the ns to be viewed available.

Signed-off-by: John Johansen <john.johansen@canonical.com>

Prepare for a tighter pairing of user namespaces and apparmor policy
namespaces, by making the ns to be viewed available and checking
that the user namespace level is the same as the policy ns level.

This strict pairing will be relaxed once true support of user namespaces
lands.

Signed-off-by: John Johansen <john.johansen@canonical.com>

Signed-off-by: John Johansen <john.johansen@canonical.com>

Signed-off-by: John Johansen <john.johansen@canonical.com>

This is prep work for fs operations being able to remove namespaces.

Signed-off-by: John Johansen <john.johansen@canonical.com>

Signed-off-by: John Johansen <john.johansen@canonical.com>

Borrow the special null device file from selinux to "close" fds that
don't have sufficient permissions at exec time.

Signed-off-by: John Johansen <john.johansen@canonical.com>

Commit 9f834ec1 ("binfmt_elf: switch to new creds when switching to new mm")
changed when the creds are installed by the binfmt_elf handler. This
affects which creds are used to mmap the executable into the address
space. Which can have an affect on apparmor policy.

Add a flag to apparmor at
/sys/kernel/security/apparmor/features/domain/fix_binfmt_elf_mmap

to make it possible to detect this semantic change so that the userspace
tools and the regression test suite can correctly deal with the change.

BugLink: http://bugs.launchpad.net/bugs/1630069


Signed-off-by: John Johansen <john.johansen@canonical.com>

Instead of testing whether a given dfa exists in every code path, have
a default null dfa that is used when loaded policy doesn't provide a
dfa.

This will let us get rid of special casing and avoid dereference bugs
when special casing is missed.

Signed-off-by: John Johansen <john.johansen@canonical.com>

Newer policy will combine the file and policydb dfas, allowing for
better optimizations. However to support older policy we need to
keep the ability to address the "file" dfa separately. So dup
the policydb as if it is the file dfa and set the appropriate start
state.

Signed-off-by: John Johansen <john.johansen@canonical.com>

The dfa is currently setup to be shared (has the basis of refcounting)
but currently can't be because the count can't be increased.

Signed-off-by: John Johansen <john.johansen@canonical.com>

Newer policy encodes more than just version in the version tag,
so add masking to make sure the comparison remains correct.

Note: this is fully compatible with older policy as it will never set
the bits being masked out.

Signed-off-by: John Johansen <john.johansen@canonical.com>

Signed-off-by: John Johansen <john.johansen@canonical.com>

Policy should always under go a full paranoid verification.

Signed-off-by: John Johansen <john.johansen@canonical.com>

When possible its better to name a learning profile after the missing
profile in question. This allows for both more informative names and
for profile reuse.

Signed-off-by: John Johansen <john.johansen@canonical.com>

Signed-off-by: John Johansen <john.johansen@canonical.com>

prepare_ns() will need to be called from alternate views, and namespaces
will need to be created via different interfaces. So refactor and
allow specifying the view ns.

Signed-off-by: John Johansen <john.johansen@canonical.com>

Signed-off-by: John Johansen <john.johansen@canonical.com>

Signed-off-by: John Johansen <john.johansen@canonical.com>

Signed-off-by: John Johansen <john.johansen@canonical.com>

Rename to the shorter and more familiar shell cmd name

Signed-off-by: John Johansen <john.johansen@canonical.com>

Rename to indicate the test is only about whether path mediation is used,
not whether other types of mediation might be used.

Signed-off-by: John Johansen <john.johansen@canonical.com>

Signed-off-by: John Johansen <john.johansen@canonical.com>

Signed-off-by: John Johansen <john.johansen@canonical.com>

Signed-off-by: John Johansen <john.johansen@canonical.com>

Signed-off-by: John Johansen <john.johansen@canonical.com>

Signed-off-by: John Johansen <john.johansen@canonical.com>

Signed-off-by: John Johansen <john.johansen@canonical.com>

Signed-off-by: John Johansen <john.johansen@canonical.com>

Proxy is shorter and a better fit than replaceby, so rename it.

Signed-off-by: John Johansen <john.johansen@canonical.com>

Invalid does not convey the meaning of the flag anymore so rename it.

Signed-off-by: John Johansen <john.johansen@canonical.com>

Move to common terminology with other LSMs and kernel infrastucture

Signed-off-by: John Johansen <john.johansen@canonical.com>

Signed-off-by: John Johansen <john.johansen@canonical.com>

Policy namespaces will be diverging from profile management and
expanding so put it in its own file.

Signed-off-by: John Johansen <john.johansen@canonical.com>