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‎.gitignore

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bin/selinuxdctl

‎LICENSE

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‎Makefile

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BIN=$(BINDIR)/selinuxdctl
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BINDIR=bin
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POLICYDIR=/etc/selinux.d
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SRC=$(shell find . -name "*.go")
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.PHONY: all
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all: build
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.PHONY: build
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build: $(BIN)
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$(BIN): $(BINDIR) $(SRC)
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go build -o $(BIN) .
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.PHONY: run
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run: $(BIN) $(POLICYDIR)
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sudo $(BIN) daemon
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$(BINDIR):
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mkdir -p $(BINDIR)
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$(POLICYDIR):
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mkdir -p $(POLICYDIR)

‎README.md

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selinuxd
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========
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This is a POC to show a daemon that would listen to SELinux policies on a
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specific directory and install them.
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The intent is to show a infrastructure-as-code approach to installing SELinux
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policies. With this, installing policies is a matter of persisting policy files
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in a specific directory, which the daemon will immediately pick up and try to
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install them.
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Building
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========
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Golang 1.15 and GNU make are required. In Fedora 33, the installation is a matter of doing:
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```
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$ sudo dnf install golang make
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```
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With this, you can build the daemon's binary with `make build`, or simply
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`make`. the binary will be persisted to the `bin/` directory.
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Running
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=======
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Once you have built the binary, simply do:
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```
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$ sudo ./bin/selinuxdctl daemon
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```
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or
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```
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$ make run
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```
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Note that `sudo` is needed as it'll attempt to install SELinux policies, which
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requires root. Also note that the `run` target will attempt to create
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`/etc/selinux.d`.
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This will:
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* Listen for file changes in the `/etc/selinux.d` directory
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- When a file is added or modified, it'll attempt to install the policy
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- When a file is removed, it'll uninstall the policy
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Testing (for demo purposes)
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===========================
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With the daemon running, do:
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```
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$ sudo cp tests/data/testport.cil /etc/selinux.d/
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```
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Notice that the policy will be installed in the system shortly:
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```
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$ sudo semodule -l | grep testport
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```
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Now, remove the policy:
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```
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$ sudo rm /etc/selinux.d/testport.cil
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```
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Notice that the policy will no longer be there:
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```
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$ sudo semodule -l | grep testport
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```
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Why?
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====
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This enables an easy way to install policies by establishing intent, as opposed to
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having to tell a system how to do things. This way, all we need to do is tell a system
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that we want a file in a specific path in the file system, and the rest will be taken care of.
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OpenShift/Machine Config Operator
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---------------------------------
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The [Machine Config Operator](https://github.com/openshift/machine-config-operator)
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is an [operator](https://kubernetes.io/docs/concepts/extend-kubernetes/operator/) that
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ensures that the nodes belonging to an OpenShift cluster are in a certain state.
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If this daemon would be running on a node in the cluster, all we would need to do
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to install a policy is:
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```
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apiVersion: machineconfiguration.openshift.io/v1
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kind: MachineConfig
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metadata:
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labels:
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machineconfiguration.openshift.io/role: worker
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name: 50-example-sepolicy
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spec:
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config:
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ignition:
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version: 2.2.0
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storage:
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files:
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- contents:
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source: data:,%3B%20Declare%20a%20test_port_t%20type%0A%28type%20test_port_t%29%0A%3B%20Assign%20the%20type%20to%20the%20object_r%20role%0A%28roletype%20object_r%20test_port_t%29%0A%0A%3B%20Assign%20the%20right%20set%20of%20attributes%20to%20the%20port%0A%28typeattributeset%20defined_port_type%20test_port_t%29%0A%28typeattributeset%20port_type%20test_port_t%29%0A%0A%3B%20Declare%20tcp%3A1440%20as%20test_port_t%0A%28portcon%20tcp%201440%20%28system_u%20object_r%20test_port_t%20%28%28s0%29%20%28s0%29%29%29%29
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filesystem: root
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mode: 0600
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path: /etc/selinux.d/testport.cil
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```
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This `MachineConfig` object tells the operator to put the policy in the specified path, with
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the specified permissions. Note that the policy is URL encoded due
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to what the [ignition format](https://github.com/coreos/ignition) requires.
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Without this daemon, each policy installation would require us to persist the file
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on the node, then run a one-off systemd unit to install the policy. As policies
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get added to the system, the number of systemd units increases, which is not scalable.
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The intent is to make this the base for the (SELinux Operator)[https://github.com/JAORMX/selinux-operator],
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as opposed to the daemonset-based approach which was taken initially.
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TODO
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====
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* Use `semanage` as a library instead of calling `semodule`.
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- This should run as a standalone binary, and not require other commands in order to run.
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- The intent is to make this available in Fedora CoreOS and RHCOS in the future.
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* Enable a query command or mechanism to check the status of the policy installed.
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- Was my policy installed correctly?
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- Did it have errors?
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* Re-write this whole thing (this is just a POC... we should consider if we want to keep
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this in Golang, or use Rust or C instead).
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* Handle policy renames

‎bin/.gitkeep

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