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---
title: Android Overview
icon: fontawesome/brands/android
description: Android is an open-source operating system with strong security protections, which makes it our top choice for phones.
---
Android to bezpieczny system operacyjny, który posiada silną [izolację aplikacji](https://source.android.com/security/app-sandbox), [Weryfikację rozruchu](https://source.android.com/security/verifiedboot) (AVB), oraz solidny system kontroli [uprawnień](https://developer.android.com/guide/topics/permissions/overview).
## Wybór dystrybucji Androida
System Android na zakupionym telefonie często zawiera zintegrowane inwazyjne aplikacje oraz usługi, które nie są częścią [Android Open Source Project](https://source.android.com/). Jedną z nich są Usługi Google Play, która ma niezbywalne uprawnienia dostępu do Twoich plików, magazynu kontaktów, rejestru połączeń, wiadomości SMS, lokalizacji, aparatu, mikrofonu, identyfikatorów sprzętowych oraz wiele więcej. Te aplikacje i usługi zwiększają możliwości ataku na Twoje urządzenie oraz są źródłem wielu obaw związanych z prywatnością systemu Android.
Ten problem można rozwiązać instalując niestandardową dystrybucję Androida, która nie zawiera tak inwazyjnej integracji. Niestety, ale wiele niestandardowych dystrybucji Androida narusza model bezpieczeństwa systemu nie wspierając funkcji bezpieczeństwa, takich jak AVB, ochrona przed cofnięciem aktualizacji, aktualizacje oprogramowania i innych. Some distributions also ship [`userdebug`](https://source.android.com/setup/build/building#choose-a-target) builds which expose root via [ADB](https://developer.android.com/studio/command-line/adb) and require [more permissive](https://github.com/LineageOS/android_system_sepolicy/search?q=userdebug&type=code) SELinux policies to accommodate debugging features, resulting in a further increased attack surface and weakened security model.
Wybierając niestandardową dystrybucję Androida, należy upewnić się, że jest ona zgodna z modelem bezpieczeństwa tego systemu. At the very least, the distribution should have production builds, support for AVB, rollback protection, timely firmware and operating system updates, and SELinux in [enforcing mode](https://source.android.com/security/selinux/concepts#enforcement_levels). All of our recommended Android distributions satisfy these criteria.
[Polecane przez nas dystrybucje Androida :hero-arrow-circle-right-fill:](../android.md ""){.md-button}
## Unikaj rootowania
[Rooting](https://en.wikipedia.org/wiki/Rooting_(Android)) Android phones can decrease security significantly as it weakens the complete [Android security model](https://en.wikipedia.org/wiki/Android_(operating_system)#Security_and_privacy). This can decrease privacy should there be an exploit that is assisted by the decreased security. Common rooting methods involve directly tampering with the boot partition, making it impossible to perform successful Verified Boot. Apps that require root will also modify the system partition meaning that Verified Boot would have to remain disabled. Having root exposed directly in the user interface also increases the [attack surface](https://en.wikipedia.org/wiki/Attack_surface) of your device and may assist in [privilege escalation](https://en.wikipedia.org/wiki/Privilege_escalation) vulnerabilities and SELinux policy bypasses.
Blokery reklam, które modyfikują [plik hosts](https://en.wikipedia.org/wiki/Hosts_(file)) (AdAway) oraz zapory sieciowe (AFWall+), które wymagają ciągłego dostępu do roota są niebezpieczne i nie powinny być używane. Nie są one również właściwym sposobem na rozwiązanie ich zamierzonych celów. Zamiast tego do blokowania reklam polecamy szyfrowany [DNS](../dns.md) lub [sieć VPN](../vpn.md) z blokowaniem serwerów. RethinkDNS, TrackerControl oraz AdAway bez dostępu do roota zajmą miejsce sieci VPN (używając interfejsu zwrotnego VPN) uniemożliwiając Ci korzystanie z usług zwiększających prywatność, takich jak Orbot lub prawdziwej sieci VPN.
AFWall+ działa w oparciu o [filtrowanie pakietów](https://en.wikipedia.org/wiki/Firewall_(computing)#Packet_filter), które może w niektórych przypadkach zostać ominięte.
Naszym zdaniem, wady zdecydowanie przewyższają zalety rootowania telefonu w celu korzystania z tych aplikacji.
## Verified Boot
[Verified Boot](https://source.android.com/security/verifiedboot) is an important part of the Android security model. It provides protection against [evil maid](https://en.wikipedia.org/wiki/Evil_maid_attack) attacks, malware persistence, and ensures security updates cannot be downgraded with [rollback protection](https://source.android.com/security/verifiedboot/verified-boot#rollback-protection).
W Androidzie 10 i nowszych zrezygnowano z szyfrowania całego dysku na rzecz bardziej elastycznego [szyfrowania plików](https://source.android.com/security/encryption/file-based). Twoje dane są zaszyfrowane za pomocą niepowtarzalnych kluczy szyfrujących, a pliki systemu operacyjnego pozostają niezaszyfrowane.
Verified Boot ensures the integrity of the operating system files, thereby preventing an adversary with physical access from tampering or installing malware on the device. In the unlikely case that malware is able to exploit other parts of the system and gain higher privileged access, Verified Boot will prevent and revert changes to the system partition upon rebooting the device.
Unfortunately, OEMs are only obliged to support Verified Boot on their stock Android distribution. Only a few OEMs such as Google support custom AVB key enrollment on their devices. Additionally, some AOSP derivatives such as LineageOS or /e/ OS do not support Verified Boot even on hardware with Verified Boot support for third-party operating systems. We recommend that you check for support **before** purchasing a new device. AOSP derivatives which do not support Verified Boot are **not** recommended.
Aktualizacje oprogramowania mają kluczowe znaczenie dla zachowania bezpieczeństwa. Producenci urządzeń zawierają umowy ze swoimi partnerami na dostarczanie komponentów o zamkniętym kodzie źródłowym przez ograniczony czas. This breaks verified boot on a stock Fairphone device, as the system will boot alternative Android operating systems such (such as /e/) [without any warning](https://source.android.com/security/verifiedboot/boot-flow#locked-devices-with-custom-root-of-trust) about custom operating system usage.
## Aktualizacje oprogramowania
Firmware updates are critical for maintaining security and without them your device cannot be secure. Dlatego ważne jest, aby zakupić urządzenie, które jest nadal wspierane. [Qualcomm](https://www.qualcomm.com/news/releases/2020/12/16/qualcomm-and-google-announce-collaboration-extend-android-os-support-and) oraz [Samsung](https://news.samsung.com/us/samsung-galaxy-security-extending-updates-knox/) oferując wsparcie dla swoich urządzeń przez 4 lata, podczas gdy tańsze produkty często mają krótszy okres wsparcia.
Urządzenia bez aktywnego wsparcia producenta układów nie otrzymują już aktualizacji oprogramowania od producentów urządzeń lub niestandardowych dystrybucji Androida. Oznacza to, że luki bezpieczeństwa w tych urządzeniach nie zostaną naprawione. [Qualcomm](https://www.qualcomm.com/news/releases/2020/12/16/qualcomm-and-google-announce-collaboration-extend-android-os-support-and) and [Samsung](https://news.samsung.com/us/samsung-galaxy-security-extending-updates-knox/) support their devices for 4 years, while cheaper products often have shorter support cycles. With the introduction of the [Pixel 6](https://support.google.com/pixelphone/answer/4457705), Google now makes their own SoC and they will provide a minimum of 5 years of support.
Ważne jest, aby nie korzystać z [niewspieranej](https://endoflife.date/android) wersji Androida. Nowsze wersje Androida nie tylko otrzymują poprawki bezpieczeństwa dla systemu operacyjnego, ale także ważne aktualizacje poprawiające prywatność.
[Uprawnienia systemu Android](https://developer.android.com/guide/topics/permissions/overview) umożliwiają Ci kontrolę nad tym, do czego mają dostęp Twoje aplikacje. Firma Google regularnie wprowadza [poprawki](https://developer.android.com/about/versions/11/privacy/permissions) do systemu zabezpieczeń z każdą kolejną wersją. Wszystkie instalowane przez Ciebie aplikacje są ściśle [izolowane](https://source.android.com/security/app-sandbox), więc nie ma potrzeby instalowania żadnych aplikacji antywirusowych.
## Wersje Androida
It's important to not use an [end-of-life](https://endoflife.date/android) version of Android. Newer versions of Android not only receive security updates for the operating system but also important privacy enhancing updates too. For example, [prior to Android 10](https://developer.android.com/about/versions/10/privacy/changes), any apps with the [`READ_PHONE_STATE`](https://developer.android.com/reference/android/Manifest.permission#READ_PHONE_STATE) permission could access sensitive and unique serial numbers of your phone such as [IMEI](https://en.wikipedia.org/wiki/International_Mobile_Equipment_Identity), [MEID](https://en.wikipedia.org/wiki/Mobile_equipment_identifier), your SIM card's [IMSI](https://en.wikipedia.org/wiki/International_mobile_subscriber_identity), whereas now they must be system apps to do so. System apps are only provided by the OEM or Android distribution.
## Uprawnienia systemu Android
[Permissions on Android](https://developer.android.com/guide/topics/permissions/overview) grant you control over what apps are allowed to access. Google regularly makes [improvements](https://developer.android.com/about/versions/11/privacy/permissions) on the permission system in each successive version. All apps you install are strictly [sandboxed](https://source.android.com/security/app-sandbox), therefore, there is no need to install any antivirus apps.
A smartphone with the latest version of Android will always be more secure than an old smartphone with an antivirus that you have paid for. It's better not to pay for antivirus software and to save money to buy a new smartphone such as a Google Pixel.
Android 10:
- [Scoped Storage](https://developer.android.com/about/versions/10/privacy/changes#scoped-storage) gives you more control over your files and can limit what can [access external storage](https://developer.android.com/training/data-storage#permissions). Apps can have a specific directory in external storage as well as the ability to store specific types of media there.
- Tighter access on [device location](https://developer.android.com/about/versions/10/privacy/changes#app-access-device-location) by introducing the `ACCESS_BACKGROUND_LOCATION` permission. This prevents apps from accessing the location when running in the background without express permission from the user.
Android 11:
- [One-time permissions](https://developer.android.com/about/versions/11/privacy/permissions#one-time) which allows you to grant a permission to an app just once.
- [Auto-reset permissions](https://developer.android.com/about/versions/11/privacy/permissions#auto-reset), which resets [runtime permissions](https://developer.android.com/guide/topics/permissions/overview#runtime) that were granted when the app was opened.
- Granular permissions for accessing [phone number](https://developer.android.com/about/versions/11/privacy/permissions#phone-numbers) related features.
Android 12:
- A permission to grant only the [approximate location](https://developer.android.com/about/versions/12/behavior-changes-12#approximate-location).
- Auto-reset of [hibernated apps](https://developer.android.com/about/versions/12/behavior-changes-12#app-hibernation).
- [Data access auditing](https://developer.android.com/about/versions/12/behavior-changes-12#data-access-auditing) which makes it easier to determine what part of an app is performing a specific type of data access.
Android 13:
- A permission for [nearby wifi access](https://developer.android.com/about/versions/13/behavior-changes-13#nearby-wifi-devices-permission). The MAC addresses of nearby WiFi access points was a popular way for apps to track a user's location.
- More [granular media permissions](https://developer.android.com/about/versions/13/behavior-changes-13#granular-media-permissions), meaning you can grant access to images, videos or audio files only.
- Background use of sensors now requires the [`BODY_SENSORS`](https://developer.android.com/about/versions/13/behavior-changes-13#body-sensors-background-permission) permission.
An app may request a permission for a specific feature it has. For example, any app that can scan QR codes will require the camera permission. Some apps can request more permissions than they need.
[Exodus](https://exodus-privacy.eu.org/) can be useful when comparing apps that have similar purposes. If an app requires a lot of permissions and has a lot of advertising and analytics this is probably a bad sign. We recommend looking at the individual trackers and reading their descriptions rather than simply **counting the total** and assuming all items listed are equal.
!!! warning
If an app is mostly a web-based service, the tracking may occur on the server side. [Facebook](https://reports.exodus-privacy.eu.org/en/reports/com.facebook.katana/latest/) shows "no trackers" but certainly does track users' interests and behavior across the site. Apps may evade detection by not using standard code libraries produced by the advertising industry, though this is unlikely.
!!! note
Privacy-friendly apps such as [Bitwarden](https://reports.exodus-privacy.eu.org/en/reports/com.x8bit.bitwarden/latest/) may show some trackers such as [Google Firebase Analytics](https://reports.exodus-privacy.eu.org/en/trackers/49/). This library includes [Firebase Cloud Messaging](https://en.wikipedia.org/wiki/Firebase_Cloud_Messaging) which can provide [push notifications](https://en.wikipedia.org/wiki/Push_technology) in apps. This [is the case](https://fosstodon.org/@bitwarden/109636825700482007) with Bitwarden. That doesn't mean that Bitwarden is using all of the analytics features that are provided by Google Firebase Analytics.
## Profile użytkowników
Quite a few applications allows you to "share" a file with them for media upload. If you want to, for example, tweet a picture to Twitter, do not grant Twitter access to your "media and photos", because it will have access to all of your pictures then. Instead, go to your file manager (documentsUI), hold onto the picture, then share it with Twitter.
## User Profiles
Multiple user profiles can be found in **Settings** → **System** → **Multiple users** and are the simplest way to isolate in Android.
With user profiles, you can impose restrictions on a specific profile, such as: making calls, using SMS, or installing apps on the device. Each profile is encrypted using its own encryption key and cannot access the data of any other profiles. Even the device owner cannot view the data of other profiles without knowing their password. Multiple user profiles are a more secure method of isolation.
## Work Profile
[Work Profiles](https://support.google.com/work/android/answer/6191949) are another way to isolate individual apps and may be more convenient than separate user profiles.
A **device controller** app such as [Shelter](#recommended-apps) is required to create a Work Profile without an enterprise MDM, unless you're using a custom Android OS which includes one.
The work profile is dependent on a device controller to function. Features such as *File Shuttle* and *contact search blocking* or any kind of isolation features must be implemented by the controller. Jeśli w danej chwili z nich nie korzystasz, zalecamy wyłączenie tych funkcji.
This method is generally less secure than a secondary user profile; however, it does allow you the convenience of running apps in both the work and personal profiles simultaneously.
## VPN Killswitch
Android 7 and above supports a VPN killswitch and it is available without the need to install third-party apps. This feature can prevent leaks if the VPN is disconnected. It can be found in :gear: **Settings** → **Network & internet** → **VPN** → :gear: → **Block connections without VPN**.
## Global Toggles
Modern Android devices have global toggles for disabling Bluetooth and location services. Android 12 introduced toggles for the camera and microphone. When not in use, we recommend disabling these features. Apps cannot use disabled features (even if granted individual permission) until re-enabled.
## Google
If you are using a device with Google services, either your stock operating system or an operating system that safely sandboxes Google Play Services like GrapheneOS, there are a number of additional changes you can make to improve your privacy. We still recommend avoiding Google services entirely, or limiting Google Play services to a specific user/work profile by combining a device controller like *Shelter* with GrapheneOS's Sandboxed Google Play.
### Advanced Protection Program
If you have a Google account we suggest enrolling in the [Advanced Protection Program](https://landing.google.com/advancedprotection/). To umożliwi Ci otrzymywanie **niektórych** poprawek bezpieczeństwa od Google bez naruszania modelu zabezpieczeń Androida poprzez używanie systemu pochodnego od Androida i zwiększanie ryzyka na atak.
The Advanced Protection Program provides enhanced threat monitoring and enables:
- Stricter two factor authentication; e.g. that [FIDO](../basics/multi-factor-authentication.md#fido-fast-identity-online) **must** be used and disallows the use of [SMS OTPs](../basics/multi-factor-authentication.md#sms-or-email-mfa), [TOTP](../basics/multi-factor-authentication.md#time-based-one-time-password-totp) and [OAuth](https://en.wikipedia.org/wiki/OAuth)
- Only Google and verified third-party apps can access account data
- Scanning of incoming emails on Gmail accounts for [phishing](https://en.wikipedia.org/wiki/Phishing#Email_phishing) attempts
- Stricter [safe browser scanning](https://www.google.com/chrome/privacy/whitepaper.html#malware) with Google Chrome
- Stricter recovery process for accounts with lost credentials
If you use non-sandboxed Google Play Services (common on stock operating systems), the Advanced Protection Program also comes with [additional benefits](https://support.google.com/accounts/answer/9764949?hl=en) such as:
- Not allowing app installation outside of the Google Play Store, the OS vendor's app store, or via [`adb`](https://en.wikipedia.org/wiki/Android_Debug_Bridge)
- Mandatory automatic device scanning with [Play Protect](https://support.google.com/googleplay/answer/2812853?hl=en#zippy=%2Chow-malware-protection-works%2Chow-privacy-alerts-work)
- Warning you about unverified applications
### Aktualizacje systemowe Google Play
In the past, Android security updates had to be shipped by the operating system vendor. Android has become more modular beginning with Android 10, and Google can push security updates for **some** system components via the privileged Play Services.
If you have an EOL device shipped with Android 10 or above and are unable to run any of our recommended operating systems on your device, you are likely going to be better off sticking with your OEM Android installation (as opposed to an operating system not listed here such as LineageOS or /e/ OS). This will allow you to receive **some** security fixes from Google, while not violating the Android security model by using an insecure Android derivative and increasing your attack surface. We would still recommend upgrading to a supported device as soon as possible.
### Advertising ID
All devices with Google Play Services installed automatically generate an [advertising ID](https://support.google.com/googleplay/android-developer/answer/6048248?hl=en) used for targeted advertising. Disable this feature to limit the data collected about you.
On Android distributions with [Sandboxed Google Play](https://grapheneos.org/usage#sandboxed-google-play), go to :gear: **Settings** → **Apps** → **Sandboxed Google Play** → **Google Settings** → **Ads**, and select *Delete advertising ID*.
On Android distributions with privileged Google Play Services (such as stock OSes), the setting may be in one of several locations. Check
- :gear: **Settings** → **Google** → **Ads**
- :gear: **Settings** → **Privacy** → **Ads**
You will either be given the option to delete your advertising ID or to *Opt out of interest-based ads*, this varies between OEM distributions of Android. If presented with the option to delete the advertising ID that is preferred. If not, then make sure to opt out and reset your advertising ID.
### SafetyNet and Play Integrity API
[SafetyNet](https://developer.android.com/training/safetynet/attestation) and the [Play Integrity APIs](https://developer.android.com/google/play/integrity) are generally used for [banking apps](https://grapheneos.org/usage#banking-apps). Many banking apps will work fine in GrapheneOS with sandboxed Play services, however some non-financial apps have their own crude anti-tampering mechanisms which might fail. GrapheneOS passes the `basicIntegrity` check, but not the certification check `ctsProfileMatch`. Devices with Android 8 or later have hardware attestation support which cannot be bypassed without leaked keys or serious vulnerabilities.
As for Google Wallet, we don't recommend this due to their [privacy policy](https://payments.google.com/payments/apis-secure/get_legal_document?ldo=0&ldt=privacynotice&ldl=en), which states you must opt-out if you don't want your credit rating and personal information shared with affiliate marketing services.

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---
title: Linux Overview
icon: fontawesome/brands/linux
description: Linux is an open-source, privacy-focused desktop operating system alternative, but not all distribitions are created equal.
---
It is often believed that [open-source](https://en.wikipedia.org/wiki/Open-source_software) software is inherently secure because the source code is available. There is an expectation that community verification occurs regularly; however, this isn’t always [the case](https://seirdy.one/posts/2022/02/02/floss-security/). It does depend on a number of factors, such as project activity, developer experience, level of rigor applied to [code reviews](https://en.wikipedia.org/wiki/Code_review), and how often attention is given to specific parts of the [codebase](https://en.wikipedia.org/wiki/Codebase) that may go untouched for years.
At the moment, desktop Linux does have some areas that could be better improved when compared to their proprietary counterparts, e.g.:
- A verified boot chain, like Apple’s [Secure Boot](https://support.apple.com/guide/security/startup-security-utility-secc7b34e5b5/web) (with [Secure Enclave](https://support.apple.com/guide/security/secure-enclave-sec59b0b31ff/1/web/1)), Android’s [Verified Boot](https://source.android.com/security/verifiedboot), ChromeOS' [Verified boot](https://www.chromium.org/chromium-os/chromiumos-design-docs/security-overview/#verified-boot), or Microsoft Windows’s [boot process](https://docs.microsoft.com/en-us/windows/security/information-protection/secure-the-windows-10-boot-process) with [TPM](https://docs.microsoft.com/en-us/windows/security/information-protection/tpm/how-windows-uses-the-tpm). These features and hardware technologies can all help prevent persistent tampering by malware or [evil maid attacks](https://en.wikipedia.org/wiki/Evil_Maid_attack)
- A strong sandboxing solution such as that found in [macOS](https://developer.apple.com/library/archive/documentation/Security/Conceptual/AppSandboxDesignGuide/AboutAppSandbox/AboutAppSandbox.html), [ChromeOS](https://chromium.googlesource.com/chromiumos/docs/+/HEAD/sandboxing.md), and [Android](https://source.android.com/security/app-sandbox). Commonly used Linux sandboxing solutions such as [Flatpak](https://docs.flatpak.org/en/latest/sandbox-permissions.html) and [Firejail](https://firejail.wordpress.com/) still have a long way to go
- Strong [exploit mitigations](https://madaidans-insecurities.github.io/linux.html#exploit-mitigations)
Despite these drawbacks, desktop Linux distributions are great if you want to:
- Avoid telemetry that often comes with proprietary operating systems
- Maintain [software freedom](https://www.gnu.org/philosophy/free-sw.en.html#four-freedoms)
- Have privacy focused systems such as [Whonix](https://www.whonix.org) or [Tails](https://tails.boum.org/)
Our website generally uses the term “Linux” to describe desktop Linux distributions. Other operating systems which also use the Linux kernel such as ChromeOS, Android, and Qubes OS are not discussed here.
[Our Linux Recommendations :material-arrow-right-drop-circle:](../desktop.md ""){.md-button}
## Choosing your distribution
Not all Linux distributions are created equal. While our Linux recommendation page is not meant to be an authoritative source on which distribution you should use, there are a few things you should keep in mind when choosing which distribution to use.
### Release cycle
We highly recommend that you choose distributions which stay close to the stable upstream software releases, often referred to as rolling release distributions. This is because frozen release cycle distributions often don’t update package versions and fall behind on security updates.
For frozen distributions such as [Debian](https://www.debian.org/security/faq#handling), package maintainers are expected to backport patches to fix vulnerabilities rather than bump the software to the “next version” released by the upstream developer. Some security fixes [do not](https://arxiv.org/abs/2105.14565) receive a [CVE](https://en.wikipedia.org/wiki/Common_Vulnerabilities_and_Exposures) (particularly less popular software) at all and therefore do not make it into the distribution with this patching model. As a result minor security fixes are sometimes held back until the next major release.
We don’t believe holding packages back and applying interim patches is a good idea, as it diverges from the way the developer might have intended the software to work. [Richard Brown](https://rootco.de/aboutme/) has a presentation about this:
<div class="yt-embed">
<iframe width="560" height="315" src="https://invidious.privacyguides.net/embed/i8c0mg_mS7U?local=true" title="Regular Releases are Wrong, Roll for your life" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
</div>
### Traditional vs Atomic updates
Traditionally, Linux distributions update by sequentially updating the desired packages. Traditional updates such as those used in Fedora, Arch Linux, and Debian based distributions can be less reliable if an error occurs while updating.
Atomic updating distributions apply updates in full or not at all. Typically, transactional update systems are also atomic.
A transactional update system creates a snapshot that is made before and after an update is applied. If an update fails at any time (perhaps due to a power failure), the update can be easily rolled back to a “last known good state."
The Atomic update method is used for immutable distributions like Silverblue, Tumbleweed, and NixOS and can achieve reliability with this model. [Adam Šamalík](https://twitter.com/adsamalik) provided a presentation on how `rpm-ostree` works with Silverblue:
<div class="yt-embed">
<iframe width="560" height="315" src="https://invidious.privacyguides.net/embed/-hpV5l-gJnQ?local=true" title="Let's try Fedora Silverblue — an immutable desktop OS! - Adam Šamalik" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
</div>
### “Security-focused” distributions
There is often some confusion between “security-focused” distributions and “pentesting” distributions. A quick search for “the most secure Linux distribution” will often give results like Kali Linux, Black Arch and Parrot OS. These distributions are offensive penetration testing distributions that bundle tools for testing other systems. They don’t include any “extra security” or defensive mitigations intended for regular use.
### Arch-based distributions
Arch based distributions are not recommended for those new to Linux, (regardless of distribution) as they require regular [system maintenance](https://wiki.archlinux.org/title/System_maintenance). Arch does not have an distribution update mechanism for the underlying software choices. As a result you have to stay aware with current trends and adopt technologies as they supersede older practices on your own.
For a secure system, you are also expected to have sufficient Linux knowledge to properly set up security for their system such as adopting a [mandatory access control](https://en.wikipedia.org/wiki/Mandatory_access_control) system, setting up [kernel module](https://en.wikipedia.org/wiki/Loadable_kernel_module#Security) blacklists, hardening boot parameters, manipulating [sysctl](https://en.wikipedia.org/wiki/Sysctl) parameters, and knowing what components they need such as [Polkit](https://en.wikipedia.org/wiki/Polkit).
Anyone using the [Arch User Repository (AUR)](https://wiki.archlinux.org/title/Arch_User_Repository), **must** be comfortable in auditing PKGBUILDs that they install from that service. AUR packages are community-produced content and are not vetted in any way, and therefore are vulnerable to software supply chain attacks, which has in fact happened [in the past](https://www.bleepingcomputer.com/news/security/malware-found-in-arch-linux-aur-package-repository/). AUR should always be used sparingly and often there is a lot of bad advice on various pages which direct people to blindly use [AUR helpers](https://wiki.archlinux.org/title/AUR_helpers) without sufficient warning. Similar warnings apply to use third-party Personal Package Archives (PPAs) on Debian based distributions or Community Projects (COPR) on Fedora.
If you are experienced with Linux and wish to use an Arch-based distribution, we only recommend mainline Arch Linux, not any of its derivatives. We recommend against these two Arch derivatives specifically:
- **Manjaro**: This distribution holds packages back for 2 weeks to make sure that their own changes don’t break, not to make sure that upstream is stable. When AUR packages are used, they are often built against the latest [libraries](https://en.wikipedia.org/wiki/Library_(computing)) from Arch’s repositories.
- **Garuda**: They use [Chaotic-AUR](https://aur.chaotic.cx/) which automatically and blindly compiles packages from the AUR. There is no verification process to make sure that the AUR packages don’t suffer from supply chain attacks.
### Kicksecure
While we strongly recommend against using outdated distributions like Debian, there is a Debian based operating system that has been hardened to be much more secure than typical Linux distributions: [Kicksecure](https://www.kicksecure.com/). Kicksecure, in oversimplified terms, is a set of scripts, configurations, and packages that substantially reduce the attack surface of Debian. It covers a lot of privacy and hardening recommendations by default.
### Linux-libre kernel and “Libre” distributions
We strongly recommend **against** using the Linux-libre kernel, since it [removes security mitigations](https://www.phoronix.com/scan.php?page=news_item&px=GNU-Linux-Libre-5.7-Released) and [suppresses kernel warnings](https://news.ycombinator.com/item?id=29674846) about vulnerable microcode for ideological reasons.
## Ogólne zalecenia
### Drive Encryption
Most Linux distributions have an option within its installer for enabling [LUKS](../encryption.md#linux-unified-key-setup) FDE. If this option isn’t set at installation time, you will have to backup your data and re-install, as encryption is applied after [disk partitioning](https://en.wikipedia.org/wiki/Disk_partitioning), but before [file systems](https://en.wikipedia.org/wiki/File_system) are formatted. We also suggest securely erasing your storage device:
- [Secure Data Erasure :material-arrow-right-drop-circle:](https://blog.privacyguides.org/2022/05/25/secure-data-erasure/)
### Swap
Consider using [ZRAM](https://wiki.archlinux.org/title/Swap#zram-generator) or [encrypted swap](https://wiki.archlinux.org/title/Dm-crypt/Swap_encryption) instead of unencrypted swap to avoid potential security issues with sensitive data being pushed to [swap space](https://en.wikipedia.org/wiki/Memory_paging). Fedora based distributions [use ZRAM by default](https://fedoraproject.org/wiki/Changes/SwapOnZRAM).
### Wayland
We recommend using a desktop environment that supports the [Wayland](https://en.wikipedia.org/wiki/Wayland_(display_server_protocol)) display protocol as it was developed with security [in mind](https://lwn.net/Articles/589147/). Its predecessor, [X11](https://en.wikipedia.org/wiki/X_Window_System), does not support GUI isolation, allowing all windows to [record screen, log and inject inputs in other windows](https://blog.invisiblethings.org/2011/04/23/linux-security-circus-on-gui-isolation.html), making any attempt at sandboxing futile. While there are options to do nested X11 such as [Xpra](https://en.wikipedia.org/wiki/Xpra) or [Xephyr](https://en.wikipedia.org/wiki/Xephyr), they often come with negative performance consequences and are not convenient to set up and are not preferable over Wayland.
Fortunately, common environments such as [GNOME](https://www.gnome.org), [KDE](https://kde.org), and the window manager [Sway](https://swaywm.org) have support for Wayland. Some distributions like Fedora and Tumbleweed use it by default, and some others may do so in the future as X11 is in [hard maintenance mode](https://www.phoronix.com/scan.php?page=news_item&px=X.Org-Maintenance-Mode-Quickly). If you’re using one of those environments it is as easy as selecting the “Wayland” session at the desktop display manager ([GDM](https://en.wikipedia.org/wiki/GNOME_Display_Manager), [SDDM](https://en.wikipedia.org/wiki/Simple_Desktop_Display_Manager)).
We recommend **against** using desktop environments or window managers that do not have Wayland support, such as Cinnamon (default on Linux Mint), Pantheon (default on Elementary OS), MATE, Xfce, and i3.
### Proprietary Firmware (Microcode Updates)
Linux distributions such as those which are [Linux-libre](https://en.wikipedia.org/wiki/Linux-libre) or DIY (Arch Linux) don’t come with the proprietary [microcode](https://en.wikipedia.org/wiki/Microcode) updates that often patch vulnerabilities. Some notable examples of these vulnerabilities include [Spectre](https://en.wikipedia.org/wiki/Spectre_(security_vulnerability)), [Meltdown](https://en.wikipedia.org/wiki/Meltdown_(security_vulnerability)), [SSB](https://en.wikipedia.org/wiki/Speculative_Store_Bypass), [Foreshadow](https://en.wikipedia.org/wiki/Foreshadow), [MDS](https://en.wikipedia.org/wiki/Microarchitectural_Data_Sampling), [SWAPGS](https://en.wikipedia.org/wiki/SWAPGS_(security_vulnerability)), and other [hardware vulnerabilities](https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/index.html).
We **highly recommend** that you install the microcode updates, as your CPU is already running the proprietary microcode from the factory. Fedora and openSUSE both have the microcode updates applied by default.
### Updates
Most Linux distributions will automatically install updates or remind you to do so. It is important to keep your OS up to date so that your software is patched when a vulnerability is found.
Some distributions (particularly those aimed at advanced users) are more barebones and expect you to do things yourself (e.g. Arch or Debian). These will require running the "package manager" (`apt`, `pacman`, `dnf`, etc.) manually in order to receive important security updates.
Additionally, some distributions will not download firmware updates automatically. For that you will need to install [`fwupd`](https://wiki.archlinux.org/title/Fwupd).
## Privacy Tweaks
### MAC Address Randomization
Many desktop Linux distributions (Fedora, openSUSE, etc) will come with [NetworkManager](https://en.wikipedia.org/wiki/NetworkManager), to configure Ethernet and Wi-Fi settings.
It is possible to [randomize](https://fedoramagazine.org/randomize-mac-address-nm/) the [MAC address](https://en.wikipedia.org/wiki/MAC_address) when using NetworkManager. This provides a bit more privacy on Wi-Fi networks as it makes it harder to track specific devices on the network you’re connected to. It does [**not**](https://papers.mathyvanhoef.com/wisec2016.pdf) make you anonymous.
We recommend changing the setting to **random** instead of **stable**, as suggested in the [article](https://fedoramagazine.org/randomize-mac-address-nm/).
If you are using [systemd-networkd](https://en.wikipedia.org/wiki/Systemd#Ancillary_components), you will need to set [`MACAddressPolicy=random`](https://www.freedesktop.org/software/systemd/man/systemd.link.html#MACAddressPolicy=) which will enable [RFC 7844 (Anonymity Profiles for DHCP Clients)](https://www.freedesktop.org/software/systemd/man/systemd.network.html#Anonymize=).
There isn’t many points in randomizing the MAC address for Ethernet connections as a system administrator can find you by looking at the port you are using on the [network switch](https://en.wikipedia.org/wiki/Network_switch). Randomizing Wi-Fi MAC addresses depends on support from the Wi-Fi’s firmware.
### Other Identifiers
There are other system identifiers which you may wish to be careful about. You should give this some thought to see if it applies to your [threat model](../basics/threat-modeling.md):
- **Hostnames:** Your system's hostname is shared with the networks you connect to. You should avoid including identifying terms like your name or operating system in your hostname, instead sticking to generic terms or random strings.
- **Usernames:** Similarly, your username is used in a variety of ways across your system. Consider using generic terms like "user" rather than your actual name.
- **Machine ID:**: During installation a unique machine ID is generated and stored on your device. Consider [setting it to a generic ID](https://madaidans-insecurities.github.io/guides/linux-hardening.html#machine-id).
### System Counting
The Fedora Project [counts](https://fedoraproject.org/wiki/Changes/DNF_Better_Counting) how many unique systems access its mirrors by using a [`countme`](https://fedoraproject.org/wiki/Changes/DNF_Better_Counting#Detailed_Description) variable instead of a unique ID. Fedora does this to determine load and provision better servers for updates where necessary.
This [option](https://dnf.readthedocs.io/en/latest/conf_ref.html#options-for-both-main-and-repo) is currently off by default. We recommend adding `countme=false` to `/etc/dnf/dnf.conf` just in case it is enabled in the future. On systems that use `rpm-ostree` such as Silverblue, the countme option is disabled by masking the [rpm-ostree-countme](https://fedoramagazine.org/getting-better-at-counting-rpm-ostree-based-systems/) timer.
openSUSE also uses a [unique ID](https://en.opensuse.org/openSUSE:Statistics) to count systems, which can be disabled by deleting the `/var/lib/zypp/AnonymousUniqueId` file.

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---
title: "Qubes Overview"
icon: simple/qubesos
description: Qubes is an operating system built around isolating apps within virtual machines for heightened security.
---
[**Qubes OS**](../desktop.md#qubes-os) is an operating system which uses the [Xen](https://en.wikipedia.org/wiki/Xen) hypervisor to provide strong security for desktop computing through isolated virtual machines. Each VM is called a *Qube* and you can assign each Qube a level of trust based on its purpose. As Qubes OS provides security by using isolation, and only permitting actions on a per case basis, it is the opposite of [badness enumeration](https://www.ranum.com/security/computer_security/editorials/dumb/).
## How does Qubes OS work?
Qubes uses [compartmentalization](https://www.qubes-os.org/intro/) to keep the system secure. Qubes are created from templates, the defaults being for Fedora, Debian and [Whonix](../desktop.md#whonix). Qubes OS also allows you to create once-use [disposable](https://www.qubes-os.org/doc/how-to-use-disposables/) virtual machines.
![Qubes architecture](../assets/img/qubes/qubes-trust-level-architecture.png)
<figcaption>Qubes Architecture, Credit: What is Qubes OS Intro</figcaption>
Each Qubes application has a [colored border](https://www.qubes-os.org/screenshots/) that can help you keep track of the virtual machine it is running in. You could, for example, use a specific color for your banking browser, while using a different color for a general untrusted browser.
![Colored border](../assets/img/qubes/r4.0-xfce-three-domains-at-work.png)
<figcaption>Qubes window borders, Credit: Qubes Screenshots</figcaption>
## Why Should I use Qubes?
Qubes OS is useful if your [threat model](../basics/threat-modeling.md) requires strong compartmentalization and security, such as if you think you'll be opening untrusted files from untrusted sources. A typical reason for using Qubes OS is to open documents from unknown sources.
Qubes OS utilizes [Dom0](https://wiki.xenproject.org/wiki/Dom0) Xen VM (i.e., an "AdminVM") for controlling other guest VMs or Qubes on the host OS. Other VMs display individual application windows within Dom0's desktop environment. It allows you to color code windows based on trust levels and run apps that can interact with each other with very granular control.
### Copying and Pasting Text
You can [copy and paste text](https://www.qubes-os.org/doc/how-to-copy-and-paste-text/) using `qvm-copy-to-vm` or the below instructions:
1. Press **Ctrl+C** to tell the VM you're in that you want to copy something.
2. Press **Ctrl+Shift+C** to tell the VM to make this buffer available to the global clipboard.
3. Press **Ctrl+Shift+V** in the destination VM to make the global clipboard available.
4. Press **Ctrl+V** in the destination VM to paste the contents in the buffer.
### File Exchange
To copy and paste files and directories (folders) from one VM to another, you can use the option **Copy to Other AppVM...** or **Move to Other AppVM...**. The difference is that the **Move** option will delete the original file. Either option will protect your clipboard from being leaked to any other Qubes. This is more secure than air-gapped file transfer because an air-gapped computer will still be forced to parse partitions or file systems. That is not required with the inter-qube copy system.
??? info "AppVMs or qubes do not have their own file systems"
You can [copy and move files](https://www.qubes-os.org/doc/how-to-copy-and-move-files/) between Qubes. When doing so the changes aren't immediately made and can be easily undone in case of an accident.
### Inter-VM Interactions
The [qrexec framework](https://www.qubes-os.org/doc/qrexec/) is a core part of Qubes which allows virtual machine communication between domains. It is built on top of the Xen library *vchan*, which facilitates [isolation through policies](https://www.qubes-os.org/news/2020/06/22/new-qrexec-policy-system/).
## Android
For additional information we encourage you to consult the extensive Qubes OS documentation pages located on the [Qubes OS Website](https://www.qubes-os.org/doc/). Offline copies can be downloaded from the Qubes OS [documentation repository](https://github.com/QubesOS/qubes-doc).
- Open Technology Fund: [*Arguably the world's most secure operating system*](https://www.opentech.fund/news/qubes-os-arguably-the-worlds-most-secure-operating-system-motherboard/)
- J. Rutkowska: [*Software compartmentalization vs. physical separation*](https://invisiblethingslab.com/resources/2014/Software_compartmentalization_vs_physical_separation.pdf)
- J. Rutkowska: [*Partitioning my digital life into security domains*](https://blog.invisiblethings.org/2011/03/13/partitioning-my-digital-life-into.html)
- Qubes OS: [*Related Articles*](https://www.qubes-os.org/news/categories/#articles)