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@ -2,7 +2,7 @@
title: Encrypt the directory that contains virtual disk images title: Encrypt the directory that contains virtual disk images
description: description:
published: true published: true
date: 2022-01-31T12:30:06.985Z date: 2022-01-31T13:14:38.667Z
tags: tags:
editor: markdown editor: markdown
dateCreated: 2022-01-31T12:30:06.985Z dateCreated: 2022-01-31T12:30:06.985Z
@ -10,12 +10,13 @@ dateCreated: 2022-01-31T12:30:06.985Z
# Encrypt virtual disk images # Encrypt virtual disk images
> *Integration of filesystem-level encryption in Phyllome OS is a work-in-progress* > *Integration of filesystem-level encryption in Phyllome OS is a work-in-progress.*
{.is-warning} {.is-warning}
## Context > *Go to [the security page](https://wiki.phyllo.me/e/en/phyllomeos/security) to learn more about Phyllome OS security*
{.is-info}
At the moment, Phyllome OS does **not** provide any kind of encryption by default at the host level. Filesystem-level encryption is just one layer of protection. For any virtual disks that contains personnal data, users are strongly advised to use full disk encryption as provided by their guest operating system. ## Introduction
This guide will show you how to compile [^1] and configure `fscrypt` to encrypt virtual disk images. It will also show you how to configure [PAM](http://www.linux-pam.org/) to work alongside `fscrypt` This guide will show you how to compile [^1] and configure `fscrypt` to encrypt virtual disk images. It will also show you how to configure [PAM](http://www.linux-pam.org/) to work alongside `fscrypt`
@ -24,9 +25,6 @@ This guide will show you how to compile [^1] and configure `fscrypt` to encrypt
> *[`fscrypt`](https://github.com/google/fscrypt) provides filesystem-level encryption and its library [is part](https://www.kernel.org/doc/html/v4.18/filesystems/fscrypt.html) of the Linux kernel. It is widely used by Android-based devices, but only compatible with a handful of filesystems* > *[`fscrypt`](https://github.com/google/fscrypt) provides filesystem-level encryption and its library [is part](https://www.kernel.org/doc/html/v4.18/filesystems/fscrypt.html) of the Linux kernel. It is widely used by Android-based devices, but only compatible with a handful of filesystems*
{.is-info} {.is-info}
> *`fscrypt` does **not** support in-place encryption. Only previously empty directories can be encrypted. If you wish to encrypt a directory which already contains files, move these files outside of the directory, encrypt it, and put the files back in*
{.is-warning}
## Installation ## Installation
### Building from source ### Building from source
@ -43,7 +41,7 @@ sudo dnf install -y git golang pam-devel m4 authselect
go get -d github.com/google/fscrypt/... go get -d github.com/google/fscrypt/...
``` ```
* Move to the install folder: * Move to the installation folder:
``` ```
cd ~/go/pkg/mod/github.com/google/fscrypt\@v0.3.1/ cd ~/go/pkg/mod/github.com/google/fscrypt\@v0.3.1/
@ -52,11 +50,13 @@ cd ~/go/pkg/mod/github.com/google/fscrypt\@v0.3.1/
> If a new version is released, for instance `v0.3.2`, update the above path accordingly > If a new version is released, for instance `v0.3.2`, update the above path accordingly
{.is-info} {.is-info}
* Run `make install`, which will install `fscrypt` to `/usr/local/bin`, `pam_fscrypt.so` to `/usr/local/lib/security`, and `pam_fscrypt/config` to `/usr/local/share/pam-configs`.* * *Run `make install`*
``` ```
sudo make install sudo make install
```
```
fatal: not a git repository (or any of the parent directories): .git fatal: not a git repository (or any of the parent directories): .git
install -d /usr/local/bin install -d /usr/local/bin
install bin/fscrypt /usr/local/bin install bin/fscrypt /usr/local/bin
@ -68,7 +68,7 @@ install bin/config /usr/local/share/pam-configs/fscrypt
install -Dm644 cmd/fscrypt/fscrypt_bash_completion /usr/local/share/bash-completion/completions/fscrypt install -Dm644 cmd/fscrypt/fscrypt_bash_completion /usr/local/share/bash-completion/completions/fscrypt
``` ```
> The error message seems innocuous > *The error message seems innocuous*
{.is-info} {.is-info}
* Move `pam_fscrypt.so` to `/usr/lib64/security/`, where it belongs: * Move `pam_fscrypt.so` to `/usr/lib64/security/`, where it belongs:
@ -81,10 +81,11 @@ sudo mv /usr/local/lib/security/pam_fscrypt.so /usr/lib64/security/pam_fscrypt.s
* Identify the `root` partition (`/`) using the command line utility `lsblk`: * Identify the `root` partition (`/`) using the command line utility `lsblk`:
`lsblk` ```
lsblk
```
``` ```
[groot@phyllome ~]$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
zram0 251:0 0 7.8G 0 disk [SWAP] zram0 251:0 0 7.8G 0 disk [SWAP]
nvme0n1 252:0 0 50G 0 disk nvme0n1 252:0 0 50G 0 disk
@ -128,10 +129,13 @@ Created global config file at "/etc/fscrypt.conf".
Metadata directories created at "/.fscrypt". Metadata directories created at "/.fscrypt".
``` ```
* Verify: * Verify fscrypt status:
``` ```
fscrypt status fscrypt status
```
```
filesystems supporting encryption: 1 filesystems supporting encryption: 1
filesystems with fscrypt metadata: 1 filesystems with fscrypt metadata: 1
@ -142,19 +146,19 @@ MOUNTPOINT DEVICE FILESYSTEM ENCRYPTION FSCRYPT
### PAM configuration ### PAM configuration
* Select the minimal profile with `authselect` * Select the minimal profile with `authselect`:
``` ```
sudo authselect select minimal --force sudo authselect select minimal --force
``` ```
* Activate the `ecryptfs` feature * Activate the `ecryptfs` feature:
``` ```
sudo authselect enable-feature with-ecryptfs sudo authselect enable-feature with-ecryptfs
``` ```
* Create a new profile based on the minimal profile and call it phyllome: * Create a new profile based on the minimal profile and call it *phyllome*:
``` ```
sudo authselect create-profile phyllome --base-on=minimal sudo authselect create-profile phyllome --base-on=minimal
@ -222,10 +226,10 @@ session [success=1 default=ignore] pam_succeed_if.so servi
session required pam_unix.so session required pam_unix.so
``` ```
> *According to [fscrypt documentation](https://github.com/google/fscrypt#enabling-the-pam-module-on-other-linux-distros), *The Auth and Session functionality of `pam_fscrypt.so` are used to automatically unlock directories when logging in as a user, and lock them when logging out [and] [t]he Password functionality [...] is used to automatically rewrap a user's login protector when their unix passphrase changes."* * > *According to [fscrypt documentation](https://github.com/google/fscrypt#enabling-the-pam-module-on-other-linux-distros): "*The Auth and Session functionality of `pam_fscrypt.so` are used to automatically unlock directories when logging in as a user, and lock them when logging out [and] [t]he Password functionality [...] is used to automatically rewrap a user's login protector when their unix passphrase changes."*
{.is-info} {.is-info}
* Copy content of *system-auth* file into a the *password-auth* file. * Copy the content of *system-auth* file to the *password-auth* file.
> *Unsure which file is the canonic one* > *Unsure which file is the canonic one*
{.is-info} {.is-info}
@ -245,49 +249,54 @@ session [default=1] pam_lastlog.so nowtmp {if "with-silent-la
session optional pam_lastlog.so silent noupdate showfailed session optional pam_lastlog.so silent noupdate showfailed
``` ```
* Create the fscrypt file under the `/etc/pam.d/` directory and add the following line to it to allow PAM to be able to check the UNIX passhphrase * Create the fscrypt file under the `/etc/pam.d/` directory and add the following line to it to allow PAM to be able to check the UNIX passphrase:
``` ```
nano /etc/pam.d/fscrypt sudo nano /etc/pam.d/fscrypt
``` ```
`auth required pam_unix.so` ```
auth required pam_unix.so
```
* Finally, apply changes to phyllome profile * Finally, apply changes to phyllome profile:
```
sudo authselect apply-changes
```
``` ```
authselect apply-changes
Changes were successfully applied. Changes were successfully applied.
``` ```
### Tame SELinux ### Tame SELinux
> *This is a work in progress. New policices will have to be designed for SELinux to work nicely with fscrypt. > *This is a work in progress. New policices will have to be designed for SELinux to work nicely with `fscrypt`.*
{.is-warning} {.is-warning}
* Create a directory to store user-created SELinux policies and move there * Create a directory to store user-created SELinux policies and move there:
``` ```
sudo mkdir /opt/selinux && cd /opt/selinux/ sudo mkdir /opt/selinux && cd /opt/selinux/
``` ```
* Allowing `systemd` to access 1000.count file * Allow `systemd` to access 1000.count file:
``` ```
ausearch -c '(systemd)' --raw | audit2allow -M my-systemd sudo ausearch -c '(systemd)' --raw | audit2allow -M my-systemd
``` ```
``` ```
semodule -X 300 -i my-systemd.pp sudo semodule -X 300 -i my-systemd.pp
``` ```
### Test ### Test
* Create a directory called `secret` in your home directory * Create a directory called `secret` in your home directory:
``` ```
mkdir ~/secret mkdir ~/secret
``` ```
* Encrypt the directory using your login passhprase * Encrypt the directory using your login passphrase:
``` ```
fscrypt encrypt ~/secret --source=pam_passphrase fscrypt encrypt ~/secret --source=pam_passphrase
@ -301,13 +310,13 @@ Enter login passphrase for test:
"/home/groot/secret" is now encrypted, unlocked, and ready for use. "/home/groot/secret" is now encrypted, unlocked, and ready for use.
``` ```
* Add a file to this directory * Add a file to this directory:
``` ```
touch ~/secret/recipe-for-pancakes-by-john-locke touch ~/secret/recipe-for-pancakes-by-john-locke
``` ```
* Reboot and make sure the file can be red after login * Reboot and make sure the file can be red after login:
``` ```
cat ~/secret/recipe-for-pancakes-by-john-locke cat ~/secret/recipe-for-pancakes-by-john-locke
@ -326,6 +335,9 @@ Pancakes
This is the right way This is the right way
``` ```
> *If a message like `key unavailable` appears, have a look a the [troubleshooting section](/gofurther/encrypt#troubleshooting) bellow*.
{.is-info}
## Encrypt virtual disks ## Encrypt virtual disks
* Encrypt default directory containing virtual disks for the current user * Encrypt default directory containing virtual disks for the current user
@ -337,6 +349,8 @@ fscrypt encrypt ~/.local/share/libvirt/images --source=pam_passphrase
> *`fscrypt` does **not** support in-place encryption. Only previously empty directories can be encrypted. If you wish to encrypt a directory which already contains files, move these files outside of the directory, encrypt it, and put the files back in* > *`fscrypt` does **not** support in-place encryption. Only previously empty directories can be encrypted. If you wish to encrypt a directory which already contains files, move these files outside of the directory, encrypt it, and put the files back in*
{.is-warning} {.is-warning}
* Ok, that's it, finally. All virtual disks created will benefit from this layer of encryption.
### Post-installation cleaning (untested) ### Post-installation cleaning (untested)
``` ```