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76 lines
2.7 KiB
Markdown
76 lines
2.7 KiB
Markdown
---
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title: "Firewalling with MirageOS on Qubes OS"
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date: 2022-08-26
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tags: ['Operating Systems', 'MirageOS', 'Qubes OS', 'Security']
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author: Tommy
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---
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[MirageOS](https://mirage.io/) is a library operating system with which you can create a unikernel for the sole purpose of acting as Qubes OS's firewall. In this post, I will walk you through how to set this up.
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## Advantages
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- Small attack surface. The unikernel only contains a minimal set of libraries to function, so it has a much smaller attack surface than a general purpose operating system like a Linux distribution or openBSD.
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- Low resource consumption. You only need about 64MB of RAM for each instance of the Mirage Firewall.
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- Fast startup time.
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## Disadvantages
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- No official package for Qubes OS. This means that you need to follow the development process on GitHub and download the new build whenever there is a release.
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- Does not work well with the Windows PV network driver. With that being said, the Windows PV networking driver is pretty buggy on its own, and I don't recommend that you use it anyways.
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## Installing the unikernel
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To deploy MirageOS, you need to copy the `vmlinuz` and `initramfs` files from their [releases page](https://github.com/mirage/qubes-mirage-firewall/releases) to `/var/lib/qubes/vm-kernels/mirage-firewall` in `dom0`.
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### TemplateVM
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Create a TemplateVM:
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```bash
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qvm-create \
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--property kernel=mirage-firewall \
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--property kernelopts='' \
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--property memory=64 \
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--property maxmem=64 \
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--property vcpus=1 \
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--property virt_mode=pvh \
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--label=black \
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--class TemplateVM \
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your_template_name
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```
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Don't worry if the TemplateVM doesn't launch --- we don't need it to.
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### Disposable Template
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Next, create a disposable template based on the TemplateVM you have just created.
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```bash
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qvm-create \
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--property template=your_template_name \
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--property provides_network=True \
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--property template_for_dispvms=True \
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--label=orange \
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--class AppVM \
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your_disposable_template_name
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qvm-features your_disposable_template_name qubes-firewall 1
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qvm-features your_disposable_template_name no-default-kernelopts 1
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```
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Your disposable templates should now launch and shut down properly.
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### Disposable FirewallVMs
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You can now create disposable FirewallVMs based on your disposable template. I recommend replacing `sys-firewall` with a disposable Mirage firewall. If you use ProxyVMs like `sys-whonix`, I recommend that you add a disposable Mirage Firewall after the ProxyVM as well, and use it as the net qube for your AppVMs.
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```bash
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qvm-create \
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--property template=your_disposable_template_name \
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--property provides_network=True \
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--property netvm=your_net_qube_name \
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--label=orange \
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--class DispVM \
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your_firwall_name
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```
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