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93 lines
5.2 KiB
Markdown
93 lines
5.2 KiB
Markdown
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Signal
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======
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What is [Signal]?
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[According to Wikipedia:][signal-wikipedia]
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> Signal is an encrypted instant messaging and voice calling application
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> for Android and iOS. It uses end-to-end encryption to secure all
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> communications to other Signal users. Signal can be used to send and receive
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> encrypted instant messages, group messages, attachments and media messages.
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> Users can independently verify the identity of their messaging correspondents
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> by comparing key fingerprints out-of-band.
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>
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> Signal is developed by Signal Technology Foundation and Signal Messenger LLC.
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> The mobile clients for are published as free and open-source software under
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> the GPLv3 license, while the desktop client and server are published under the
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> AGPL-3.0-only license.
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How to install Signal Desktop in Qubes
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--------------------------------------
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**CAUTION:** Before proceeding, please carefully read [On Digital Signatures and Key Verification][qubes-verifying-signatures].
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This website cannot guarantee that any PGP key you download from the Internet is authentic.
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Always obtain a trusted key fingerprint via other channels, and always check any key you download against your trusted copy of the fingerprint.
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The following adapts the official [Linux (Debian-based) Install Instructions][signal-debian-instructions] from Signal's website for Qubes.
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1. (Optional) Create a TemplateVM ('debian-11' is used as an example, but could have been 'debian-11-minimal', 'debian-10', etc.):
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[user@dom0 ~]$ sudo qubesctl --skip-dom0 --targets=debian-11 --show-output state.sls update.qubes-vm
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2. Open a terminal in Debian 11 (or your previously chosen template ; note that `gnome-terminal` isn't installed by default in a [minimal template], in which case replace `gnome-terminal` with `uxterm`):
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[user@dom0 ~]$ qvm-run -a debian-11 gnome-terminal
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3. Run these commands in the terminal you've just opened:
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Install the curl program needed to download the signal signing key:
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sudo apt install curl
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We need a notification daemon, otherwise Signal will hang the first time you receive a message when the window doesn’t have the focus (alternatively you could install `xfce4-notifyd` instead of `dunst`):
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sudo apt install dunst
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Download the Signal signing key (we need to pass the `--proxy` argument to `curl` as TemplateVMs can only access internet through a proxy at localhost/127.0.0.1 port 8082):
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curl --proxy 127.0.0.1:8082 -s https://updates.signal.org/desktop/apt/keys.asc | gpg --dearmor | sudo tee -a /usr/share/keyrings/signal-desktop-keyring.gpg > /dev/null
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Add the Signal repository (Signal don't offer a `buster/bullseye` repository, they use `xenial` but it doesn't change anything for debian users):
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echo 'deb [arch=amd64 signed-by=/usr/share/keyrings/signal-desktop-keyring.gpg] https://updates.signal.org/desktop/apt xenial main' | sudo tee -a /etc/apt/sources.list.d/signal-desktop.list
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Then fetch all repositories (now including the newly added Signal repository), bring the TemplateVM up-to-date, and finally install Signal:
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sudo apt update && sudo apt full-upgrade && sudo apt install --no-install-recommends signal-desktop
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4. A bit more work is required in case you used a minimal template for the TemplateVM above:
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`signal-desktop` requires at the minimum `libatk1.0-0`, `libatk-bridge2.0-0`, `libcups2` and `libgtk-3-0` to run. Those dependencies are automatically installed when installing `xfce4-notifyd`, but if you installed `dunst` you'll have to add them:
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sudo apt install libatk1.0-0 libatk-bridge2.0-0 libcups2 libgtk-3-0
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If you haven't done so already, `qubes-core-agent-networking` must be installed for networking to work in qubes which are based on minimal templates:
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sudo apt install qubes-core-agent-networking
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Then optionally install the following packages for convenience of handling files (`zenity` is needed by the Qubes OS functions in `qubes-core-agent-nautilus` to show the progress dialog when moving / copying files):
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sudo apt install nautilus qubes-core-agent-nautilus zenity
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5. Shutdown the TemplateVM (substitute your template name if needed):
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[user@dom0 ~]$ qvm-shutdown debian-11
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6. Create an AppVM based on this TemplateVM.
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7. With your mouse, select the `Q` menu -> `Domain: "AppVM Name"` -> `"AppVM Name": Qube Settings` -> `Applications` (or in Qubes Manager `"AppVM Name"` -> `Settings` -> `Applications`). Select `Signal` from the left `Available` column, move it to the right `Selected` column by clicking the `>` button and then `OK` to apply the changes and close the window.
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-----
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[qubes-verifying-signatures]: https://www.qubes-os.org/security/verifying-signatures/
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[Signal]: https://signal.org/
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[signal-debian-instructions]: https://www.signal.org/download/linux/
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[signal-wikipedia]: https://en.wikipedia.org/wiki/Signal_(software)
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[shortcut]: https://support.whispersystems.org/hc/en-us/articles/216839277-Where-is-Signal-Desktop-on-my-computer-
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[shortcut-desktop]: https://www.qubes-os.org/doc/managing-appvm-shortcuts/#tocAnchor-1-1-1
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[message]: https://groups.google.com/d/msg/qubes-users/rMMgeR-KLbU/XXOFri26BAAJ
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[mailing list]: https://www.qubes-os.org/support/
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[minimal template]: https://www.qubes-os.org/doc/templates/minimal/
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