Merge pull request #30689 from saschagrunert/spo-release
Add blog post about SPO v0.4.0 releasepull/31002/head
Kubernetes Prow Robot
GitHub
commit
78b252f511
|
|
@ -0,0 +1,148 @@
|
|||
---
|
||||
layout: blog
|
||||
title: "What's new in Security Profiles Operator v0.4.0"
|
||||
date: 2021-12-17
|
||||
slug: security-profiles-operator
|
||||
---
|
||||
|
||||
**Authors:** Jakub Hrozek, Juan Antonio Osorio, Paulo Gomes, Sascha Grunert
|
||||
|
||||
---
|
||||
|
||||
The [Security Profiles Operator (SPO)](https://sigs.k8s.io/security-profiles-operator)
|
||||
is an out-of-tree Kubernetes enhancement to make the management of
|
||||
[seccomp](https://en.wikipedia.org/wiki/Seccomp),
|
||||
[SELinux](https://en.wikipedia.org/wiki/Security-Enhanced_Linux) and
|
||||
[AppArmor](https://en.wikipedia.org/wiki/AppArmor) profiles easier and more
|
||||
convenient. We're happy to announce that we recently [released
|
||||
v0.4.0](https://github.com/kubernetes-sigs/security-profiles-operator/releases/tag/v0.4.0)
|
||||
of the operator, which contains a ton of new features, fixes and usability
|
||||
improvements.
|
||||
|
||||
## What's new
|
||||
|
||||
It has been a while since the last
|
||||
[v0.3.0](https://github.com/kubernetes-sigs/security-profiles-operator/releases/tag/v0.3.0)
|
||||
release of the operator. We added new features, fine-tuned existing ones and
|
||||
reworked our documentation in 290 commits over the past half year.
|
||||
|
||||
One of the highlights is that we're now able to record seccomp and SELinux
|
||||
profiles using the operators [log enricher](https://github.com/kubernetes-sigs/security-profiles-operator/blob/71b3915/installation-usage.md#log-enricher-based-recording).
|
||||
This allows us to reduce the dependencies required for profile recording to have
|
||||
[auditd](https://linux.die.net/man/8/auditd) or
|
||||
[syslog](https://en.wikipedia.org/wiki/Syslog) (as fallback) running on the
|
||||
nodes. All profile recordings in the operator work in the same way by using the
|
||||
`ProfileRecording` CRD as well as their corresponding [label
|
||||
selectors](/docs/concepts/overview/working-with-objects/labels). The log
|
||||
enricher itself can be also used to gather meaningful insights about seccomp and
|
||||
SELinux messages of a node. Checkout the [official
|
||||
documentation](https://github.com/kubernetes-sigs/security-profiles-operator/blob/71b3915/installation-usage.md#using-the-log-enricher)
|
||||
to learn more about it.
|
||||
|
||||
### seccomp related improvements
|
||||
|
||||
Beside the log enricher based recording we now offer an alternative to record
|
||||
seccomp profiles by utilizing [ebpf](https://ebpf.io). This optional feature can
|
||||
be enabled by setting `enableBpfRecorder` to `true`. This results in running a
|
||||
dedicated container, which ships a custom bpf module on every node to collect
|
||||
the syscalls for containers. It even supports older Kernel versions which do not
|
||||
expose the [BPF Type Format (BTF)](https://www.kernel.org/doc/html/latest/bpf/btf.html) per
|
||||
default as well as the `amd64` and `arm64` architectures. Checkout
|
||||
[our documentation](https://github.com/kubernetes-sigs/security-profiles-operator/blob/71b3915/installation-usage.md#ebpf-based-recording)
|
||||
to see it in action. By the way, we now add the seccomp profile architecture of
|
||||
the recorder host to the recorded profile as well.
|
||||
|
||||
We also graduated the seccomp profile API from `v1alpha1` to `v1beta1`. This
|
||||
aligns with our overall goal to stabilize the CRD APIs over time. The only thing
|
||||
which has changed is that the seccomp profile type `Architectures` now points to
|
||||
`[]Arch` instead of `[]*Arch`.
|
||||
|
||||
### SELinux enhancements
|
||||
|
||||
Managing SELinux policies (an equivalent to using `semodule` that
|
||||
you would normally call on a single server) is not done by SPO
|
||||
itself, but by another container called selinuxd to provide better
|
||||
isolation. This release switched to using selinuxd containers from
|
||||
a personal repository to images located under [our team's quay.io
|
||||
repository](https://quay.io/organization/security-profiles-operator).
|
||||
The selinuxd repository has moved as well to [the containers GitHub
|
||||
organization](https://github.com/containers/selinuxd).
|
||||
|
||||
Please note that selinuxd links dynamically to `libsemanage` and mounts the
|
||||
SELinux directories from the nodes, which means that the selinuxd container
|
||||
must be running the same distribution as the cluster nodes. SPO defaults
|
||||
to using CentOS-8 based containers, but we also build Fedora based ones.
|
||||
If you are using another distribution and would like us to add support for
|
||||
it, please file [an issue against selinuxd](https://github.com/containers/selinuxd/issues).
|
||||
|
||||
#### Profile Recording
|
||||
|
||||
This release adds support for recording of SELinux profiles.
|
||||
The recording itself is managed via an instance of a `ProfileRecording` Custom
|
||||
Resource as seen in an
|
||||
[example](https://github.com/kubernetes-sigs/security-profiles-operator/blob/main/examples/profilerecording-selinux-logs.yaml)
|
||||
in our repository. From the user's point of view it works pretty much the same
|
||||
as recording of seccomp profiles.
|
||||
|
||||
Under the hood, to know what the workload is doing SPO installs a special
|
||||
permissive policy called [selinuxrecording](https://github.com/kubernetes-sigs/security-profiles-operator/blob/main/deploy/base/profiles/selinuxrecording.cil)
|
||||
on startup which allows everything and logs all AVCs to `audit.log`.
|
||||
These AVC messages are scraped by the log enricher component and when
|
||||
the recorded workload exits, the policy is created.
|
||||
|
||||
#### `SELinuxProfile` CRD graduation
|
||||
|
||||
An `v1alpha2` version of the `SelinuxProfile` object has been introduced. This
|
||||
removes the raw Common Intermediate Language (CIL) from the object itself and
|
||||
instead adds a simple policy language to ease the writing and parsing
|
||||
experience.
|
||||
|
||||
Alongside, a `RawSelinuxProfile` object was also introduced. This contains a
|
||||
wrapped and raw representation of the policy. This was intended for folks to be
|
||||
able to take their existing policies into use as soon as possible. However, on
|
||||
validations are done here.
|
||||
|
||||
### AppArmor support
|
||||
|
||||
This version introduces the initial support for AppArmor, allowing users to load and
|
||||
unload AppArmor profiles into cluster nodes by using the new [AppArmorProfile](https://github.com/kubernetes-sigs/security-profiles-operator/blob/main/deploy/base/crds/apparmorprofile.yaml) CRD.
|
||||
|
||||
To enable AppArmor support use the [enableAppArmor feature gate](https://github.com/kubernetes-sigs/security-profiles-operator/blob/main/examples/config.yaml#L10) switch of your SPO configuration.
|
||||
Then use our [apparmor example](https://github.com/kubernetes-sigs/security-profiles-operator/blob/main/examples/apparmorprofile.yaml) to deploy your first profile across your cluster.
|
||||
|
||||
### Metrics
|
||||
|
||||
The operator now exposes metrics, which are described in detail in
|
||||
our new [metrics documentation](https://github.com/kubernetes-sigs/security-profiles-operator/blob/71b3915/installation-usage.md#using-metrics).
|
||||
We decided to secure the metrics retrieval process by using
|
||||
[kube-rbac-proxy](https://github.com/brancz/kube-rbac-proxy), while we ship an
|
||||
additional `spo-metrics-client` cluster role (and binding) to retrieve the
|
||||
metrics from within the cluster. If you're using
|
||||
[OpenShift](https://www.redhat.com/en/technologies/cloud-computing/openshift),
|
||||
then we provide an out of the box working
|
||||
[`ServiceMonitor`](https://github.com/kubernetes-sigs/security-profiles-operator/blob/71b3915/installation-usage.md#automatic-servicemonitor-deployment)
|
||||
to access the metrics.
|
||||
|
||||
#### Debuggability and robustness
|
||||
|
||||
Beside all those new features, we decided to restructure parts of the Security
|
||||
Profiles Operator internally to make it better to debug and more robust. For
|
||||
example, we now maintain an internal [gRPC](https://grpc.io) API to communicate
|
||||
within the operator across different features. We also improved the performance
|
||||
of the log enricher, which now caches results for faster retrieval of the log
|
||||
data. The operator can be put into a more [verbose log mode](https://github.com/kubernetes-sigs/security-profiles-operator/blob/71b3915/installation-usage.md#set-logging-verbosity)
|
||||
by setting `verbosity` from `0` to `1`.
|
||||
|
||||
We also print the used `libseccomp` and `libbpf` versions on startup, as well as
|
||||
expose CPU and memory profiling endpoints for each container via the
|
||||
[`enableProfiling` option](https://github.com/kubernetes-sigs/security-profiles-operator/blob/71b3915/installation-usage.md#enable-cpu-and-memory-profiling).
|
||||
Dedicated liveness and startup probes inside of the operator daemon will now
|
||||
additionally improve the life cycle of the operator.
|
||||
|
||||
## Conclusion
|
||||
|
||||
Thank you for reading this update. We're looking forward to future enhancements
|
||||
of the operator and would love to get your feedback about the latest release.
|
||||
Feel free to reach out to us via the Kubernetes slack
|
||||
[#security-profiles-operator](https://kubernetes.slack.com/messages/security-profiles-operator)
|
||||
for any feedback or question.
|
||||
Loading…
Reference in New Issue