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OpenSSH FIDO2

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Signed-off-by: Tommy <contact@tommytran.io>
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Tommy 2022-07-17 03:04:46 -04:00
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---
title: "F-Droid Security Analysis"
date: 2022-01-02T21:28:31Z
tags: ['software', 'android', 'security']
author: Wonderfall
canonicalURL: https://wonderfall.dev/fdroid-issues
@ -155,7 +154,6 @@ In modern Android, the background restriction toggle is what really provides the
Another example to illustrate the shortcomings of this approach would be the `QUERY_ALL_PACKAGES` low-level permission, which is referred to as the *query all packages* permission that "allows an app to see all installed packages". While this is somewhat correct, this can also be misleading: apps do not need `QUERY_ALL_PACKAGES` to list other apps within the same user profile. Even without this permission, some apps are visible automatically (visibility is restricted by default [since Android 11](https://developer.android.com/training/package-visibility)). If an app needs more visibility, it will declare a `<queries>` element in its manifest file: in other words, `QUERY_ALL_PACKAGES` is only one way to achieve visibility. Again, this goes to show low-level manifest permissions are not intended to be interpreted as high-level permissions the user should fully comprehend.
Play Store for instance conveys the permissions in a way less misleading way: the main low-level permissions are first grouped in their high-level user-facing toggles, and the rest is shown under "Other". This permission list can only be accessed by taping "About this app" then "App permissions - See more" at the bottom of the page. Play Store will tell the app may request access to the following permissions: this kind of wording is more important than it seems. *Update: since July 2022, Play Store doesn't offer a way to display low-level permissions anymore.*
Moreover, [Play Store restricts the use of highly invasive permissions](https://support.google.com/googleplay/android-developer/answer/9888170) such as `MANAGE_EXTERNAL_STORAGE` which allows apps to opt out of scoped storage if they can't work with [more privacy friendly approaches](https://developer.android.com/guide/topics/providers/document-provider) (like a file explorer). Apps that can't justify their use of this permission (which again has to be granted dynamically) may be removed from Play Store. This is where an app repository can actually be useful in their review process to protect end-users from installing poorly made apps that might compromise their privacy. Not that it matters much if these apps target very old API levels that are inclined to require invasive permissions in the first place...

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---
title: "Docker and OCI Hardening"
date: 2022-03-30T21:23:12Z
tags: ['operating systems', 'linux', 'container', 'security']
author: Wonderfall
canonicalURL: https://wonderfall.dev/docker-hardening/

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---
title: "Securing OpenSSH with FIDO2"
tags: ['operating systems', 'linux', 'security']
author: Wonderfall
canonicalURL: https://wonderfall.dev/openssh-fido2/
ShowCanonicalLink: true
---
Passwordless authentication with OpenSSH keys has been the *de facto* security standard for years. SSH keys are more robust since they're cryptographically sane by default, and are therefore resilient to most bruteforce atacks. They're also easier to manage while enabling a form of decentralized authentication (it's easy and painless to revoke them). So, what's the next step? And more exactly, why would one need something even better?
## Why?
The main problem with SSH keys is that they're not magic: they consist of a key pair, of which the private key is stored on your disk. You should be wary of various exfiltration attempts, depending on your theat model:
- If your disk is not encrypted, any physical access could compromise your keys.
- If your private key isn't encrypted, malicious applications could compromise it.
- Even with both encrypted, malicious applications could register your keystrokes.
All these attempts are particularly a thing on desktop platforms, because they don't have a proper sandboxing model. On Windows, non-UWP apps could likely have full access to your `.ssh` directory. On desktop Linux distributions, sandboxing is also lacking, and the situation is even worse if you're using X.org since it allows apps to spy on each other (and on your keyboard) by design. A first good step would be to only use SSH from a trusted & decently secure system.
Another layer of defense would obviously be multi-factor authentification, or the fact that you're relying on a shared secret instead. We can use FIDO2 security keys for that. That way, even if your private key is compromised, the attacker needs physical access to your security key. TOTP is another common 2FA technique, but it's vulnerable to various attacks, and relies on the quality of the implementation on the server.
## How?
Fortunately for us, [OpenSSH 8.2](https://www.openssh.com/txt/release-8.2) (released in February 2020) introduced native support for FIDO2/U2F. Most OpenSSH distributions should have the middleware set to use the `libfido2` library, including portable versions such as the one [for Win32](https://github.com/PowerShell/Win32-OpenSSH).
Basically, `ssh-keygen -t ${key_type}-sk` will generate for us a token-backed key pair. The key types that are supported depend on your security key. Newer models should support both ECDSA-P256 (`ecdsa-sk`) and Ed25519 (`ed25519-sk`). If the latter is available, you should prefer it.
### Client configuration
To get started:
```
ssh-keygen -t ed25519-sk
```
This will generate a `id_ed25519_sk` private key and a `id_ed25519_sk.pub` public key in `.ssh`. These are defaults, but you can change them if you want. We will call this key pair a "handle", because they're not sufficient by themselves to derive the real secret (as you guessed it, the FIDO2 token is needed). `ssh-keygen` should ask you to touch the key, and enter the PIN prior to that if you did set one (you probably should).
You can also generate a **resident key** (referred to as *discoverable credential* in the WebAuthn specification):
```
ssh-keygen -t ed25519-sk -O resident -O application=ssh:user1
```
As you can see, a few options must be specified:
- `-O resident` will tell `ssh-keygen` to generate a resident key, meaning that the private "handle" key will also be stored on the security key itself. This has security implications, but you may want that to move seamlessly between different computers. In that case, you should absolutely protect your key with a PIN beforehand.
- `-O application=ssh:` is necessary to instruct that the resident key will use a particular slot, because the security key will have to index the resident keys (by default, they use `ssh:` with an empty user ID). If this is not specificed, the next key generation might overwrite the previous one.
- `-O verify-required` is optional but instructs that a PIN is required to generate/access the key.
Resident keys can be retrieved using `ssh-keygen -K` or `ssh-add -K` if you don't want to write them to the disk.
### Server configuration
Next, transfer your public key over to the server (granted you have already access to it with a regular key pair):
```
ssh-copy-id -i ~/.ssh/id_ed25519_sk.pub user@server.domain.tld
```
*Ta-da!* But one last thing: we need to make sure the server supports this public key format in `sshd_config`:
```
PubkeyAcceptedKeyTypes ssh-ed25519,sk-ssh-ed25519@openssh.com
```
Adding `sk-ssh-ed25519@openssh.com` to `PubkeyAcceptedKeyTypes` should suffice. It's best practice to only use the cryptographic primitives that you need, and hopefully ones that are also modern. This isn't a full-on SSH hardening guide, but you should take a look at the [configuration file GrapheneOS uses](https://github.com/GrapheneOS/infrastructure/blob/main/sshd_config) for their servers to give you an idea on a few good practices.
Restart the `sshd` service and try to connect to your server using your key handle (by passing `-i ~/.ssh/id_ed25519_sk` to `ssh` for instance). If that works for you (your FIDO2 security key should be needed to derive the real secret), feel free to remove your previous keys from `.ssh/authorized_keys` on your server.
## That's cool, right?
If you don't have a security key, you can buy one from [YubiKey](https://www.yubico.com/fr/store/) (I'm very happy with my 5C NFC by the way), [Nitrokey](https://www.nitrokey.com/), [SoloKeys](https://solokeys.com/) or [OnlyKey](https://onlykey.io/) (to name a few). If you have an Android device with a hardware security module (HSM), such as the Google Pixels equipped with Titan M (Pixel 3+), you could even use them as bluetooth security keys.
*No reason to miss out on the party if you can afford it!*

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rm -rf './content/apps/F-Droid Security Analysis.md'
curl https://raw.githubusercontent.com/Wonderfall/wonderfall.github.io/main/content/posts/fdroid-issues.md -o './content/apps/F-Droid Security Analysis.md'
sed -i 's/title:.*/title: "F-Droid Security Analysis"/' './content/apps/F-Droid Security Analysis.md'
sed -i '/draft: false/d' './content/apps/F-Droid Security Analysis.md'
sed -i '/date:.*/d' './content/apps/F-Droid Security Analysis.md'
sed -i '/draft:.*/d' './content/apps/F-Droid Security Analysis.md'
sed -i "s/tags:.*/tags: ['applications', 'android', 'security']/" './content/apps/F-Droid Security Analysis.md'
sed -i '/^tags:.*/a ShowCanonicalLink: true' './content/apps/F-Droid Security Analysis.md'
sed -i '/^tags:.*/a canonicalURL: https://wonderfall.dev/fdroid-issues' './content/apps/F-Droid Security Analysis.md'
@ -14,8 +15,20 @@ sed -i '/^tags:.*/a author: Wonderfall' './content/apps/F-Droid Security Analysi
rm -rf './content/os/Docker and OCI Hardening.md'
curl https://raw.githubusercontent.com/Wonderfall/wonderfall.github.io/main/content/posts/docker-hardening.md -o './content/os/Docker and OCI Hardening.md'
sed -i 's/title:.*/title: "Docker and OCI Hardening"/' './content/os/Docker and OCI Hardening.md'
sed -i '/draft: false/d' './content/os/Docker and OCI Hardening.md'
sed -i '/date:.*/d' './content/os/Docker and OCI Hardening.md'
sed -i '/draft:.*/d' './content/os/Docker and OCI Hardening.md'
sed -i "s/tags:.*/tags: ['operating systems', 'linux', 'container', 'security']/" './content/os/Docker and OCI Hardening.md'
sed -i '/^tags:.*/a ShowCanonicalLink: true' './content/os/Docker and OCI Hardening.md'
sed -i '/^tags:.*/a canonicalURL: https://wonderfall.dev/docker-hardening/' './content/os/Docker and OCI Hardening.md'
sed -i '/^tags:.*/a author: Wonderfall' './content/os/Docker and OCI Hardening.md'
sed -i '/^tags:.*/a author: Wonderfall' './content/os/Docker and OCI Hardening.md'
#Securing OpenSSH with FIDO2
rm -rf './content/os/Securing OpenSSH with FIDO2.md'
curl https://raw.githubusercontent.com/Wonderfall/wonderfall.github.io/main/content/posts/openssh-fido2.md -o './content/os/Securing OpenSSH with FIDO2.md'
sed -i 's/title:.*/title: "Securing OpenSSH with FIDO2"/' './content/os/Securing OpenSSH with FIDO2.md'
sed -i '/date:.*/d' './content/os/Securing OpenSSH with FIDO2.md'
sed -i '/draft:.*/d' './content/os/Securing OpenSSH with FIDO2.md'
sed -i "s/tags:.*/tags: ['operating systems', 'linux', 'security']/" './content/os/Securing OpenSSH with FIDO2.md'
sed -i '/^tags:.*/a ShowCanonicalLink: true' './content/os/Securing OpenSSH with FIDO2.md'
sed -i '/^tags:.*/a canonicalURL: https://wonderfall.dev/openssh-fido2/' './content/os/Securing OpenSSH with FIDO2.md'
sed -i '/^tags:.*/a author: Wonderfall' './content/os/Securing OpenSSH with FIDO2.md'

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<!doctype html><html lang=en dir=auto><head><meta charset=utf-8><meta http-equiv=x-ua-compatible content="IE=edge"><meta name=viewport content="width=device-width,initial-scale=1,shrink-to-fit=no"><meta name=robots content="index, follow"><title>Applications | PrivSec.dev</title><meta name=keywords content><meta name=description content="Applications - PrivSec.dev"><meta name=author content="PrivSec Team"><link rel=canonical href=https://privsec.dev/apps/><link crossorigin=anonymous href=/assets/css/stylesheet.8b523f1730c922e314350296d83fd666efa16519ca136320a93df674d00b6325.css integrity="sha256-i1I/FzDJIuMUNQKW2D/WZu+hZRnKE2MgqT32dNALYyU=" rel="preload stylesheet" as=style><link rel=icon href=https://privsec.dev/%3Clink%20/%20abs%20url%3E><link rel=icon type=image/png sizes=16x16 href=https://privsec.dev/%3Clink%20/%20abs%20url%3E><link rel=icon type=image/png sizes=32x32 href=https://privsec.dev/%3Clink%20/%20abs%20url%3E><link rel=apple-touch-icon href=https://privsec.dev/%3Clink%20/%20abs%20url%3E><link rel=mask-icon href=https://privsec.dev/%3Clink%20/%20abs%20url%3E><meta name=theme-color content="#2e2e33"><meta name=msapplication-TileColor content="#2e2e33"><link rel=alternate type=application/rss+xml href=https://privsec.dev/apps/index.xml><noscript><style>#theme-toggle,.top-link{display:none}</style></noscript><meta property="og:title" content="Applications"><meta property="og:description" content><meta property="og:type" content="website"><meta property="og:url" content="https://privsec.dev/apps/"><meta name=twitter:card content="summary"><meta name=twitter:title content="Applications"><meta name=twitter:description content><script type=application/ld+json>{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":2,"name":"Applications","item":"https://privsec.dev/apps/"}]}</script></head><body class="list dark" id=top><script>localStorage.getItem("pref-theme")==="light"&&document.body.classList.remove("dark")</script><header class=header><nav class=nav><div class=logo><a href=https://privsec.dev accesskey=h title="PrivSec.dev (Alt + H)">PrivSec.dev</a><div class=logo-switches><button id=theme-toggle accesskey=t title="(Alt + T)"><svg id="moon" xmlns="http://www.w3.org/2000/svg" width="24" height="18" viewBox="0 0 24 24" fill="none" stroke="currentcolor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M21 12.79A9 9 0 1111.21 3 7 7 0 0021 12.79z"/></svg><svg id="sun" xmlns="http://www.w3.org/2000/svg" width="24" height="18" viewBox="0 0 24 24" fill="none" stroke="currentcolor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="5"/><line x1="12" y1="1" x2="12" y2="3"/><line x1="12" y1="21" x2="12" y2="23"/><line x1="4.22" y1="4.22" x2="5.64" y2="5.64"/><line x1="18.36" y1="18.36" x2="19.78" y2="19.78"/><line x1="1" y1="12" x2="3" y2="12"/><line x1="21" y1="12" x2="23" y2="12"/><line x1="4.22" y1="19.78" x2="5.64" y2="18.36"/><line x1="18.36" y1="5.64" x2="19.78" y2="4.22"/></svg></button></div></div><ul id=menu><li><a href=https://privsec.dev/knowledge/ title="Knowledge Base"><span>Knowledge Base</span></a></li><li><a href=https://privsec.dev/os/ title="Operating Systems"><span>Operating Systems</span></a></li><li><a href=https://privsec.dev/apps/ title=Applications><span class=active>Applications</span></a></li><li><a href=https://privsec.dev/providers/ title=Providers><span>Providers</span></a></li></ul></nav></header><main class=main><header class=page-header><div class=breadcrumbs><a href=https://privsec.dev>Home</a></div><h1>Applications
<a href=index.xml title=RSS aria-label=RSS><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentcolor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" height="23"><path d="M4 11a9 9 0 019 9"/><path d="M4 4a16 16 0 0116 16"/><circle cx="5" cy="19" r="1"/></svg></a></h1></header><article class=post-entry><header class=entry-header><h2>F-Droid Security Analysis</h2></header><div class=entry-content><p>F-Droid is a popular alternative app repository for Android, especially known for its main repository dedicated to free and open-source software. F-Droid is often recommended among security and privacy enthusiasts, but how does it stack up against Play Store in practice? This write-up will attempt to emphasize major security issues with F-Droid that you should consider.
Before we start, a few things to keep in mind:
The main goal of this write-up was to inform users so they can make responsible choices, not to trash someone else’s work....</p></div><footer class=entry-footer><span title='2022-01-02 21:28:31 +0000 UTC'>January 2, 2022</span>&nbsp;·&nbsp;26 min&nbsp;·&nbsp;5392 words&nbsp;·&nbsp;Wonderfall</footer><a class=entry-link aria-label="post link to F-Droid Security Analysis" href=https://privsec.dev/apps/f-droid-security-analysis/></a></article></main><footer class=footer><span>&copy; 2022 <a href=https://privsec.dev>PrivSec.dev</a></span>
The main goal of this write-up was to inform users so they can make responsible choices, not to trash someone else’s work....</p></div><footer class=entry-footer>25 min&nbsp;·&nbsp;5298 words&nbsp;·&nbsp;Wonderfall</footer><a class=entry-link aria-label="post link to F-Droid Security Analysis" href=https://privsec.dev/apps/f-droid-security-analysis/></a></article></main><footer class=footer><span>&copy; 2022 <a href=https://privsec.dev>PrivSec.dev</a></span>
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<title>Applications on PrivSec.dev</title>
<link>https://privsec.dev/apps/</link>
<description>Recent content in Applications on PrivSec.dev</description>
<generator>Hugo -- gohugo.io</generator>
<lastBuildDate>Sun, 02 Jan 2022 21:28:31 +0000</lastBuildDate><atom:link href="https://privsec.dev/apps/index.xml" rel="self" type="application/rss+xml" />
<generator>Hugo -- gohugo.io</generator><atom:link href="https://privsec.dev/apps/index.xml" rel="self" type="application/rss+xml" />
<item>
<title>F-Droid Security Analysis</title>
<link>https://privsec.dev/apps/f-droid-security-analysis/</link>
<pubDate>Sun, 02 Jan 2022 21:28:31 +0000</pubDate>
<pubDate>Mon, 01 Jan 0001 00:00:00 +0000</pubDate>
<guid>https://privsec.dev/apps/f-droid-security-analysis/</guid>
<description>F-Droid is a popular alternative app repository for Android, especially known for its main repository dedicated to free and open-source software. F-Droid is often recommended among security and privacy enthusiasts, but how does it stack up against Play Store in practice? This write-up will attempt to emphasize major security issues with F-Droid that you should consider.

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@ -4,31 +4,7 @@
<title>PrivSec.dev</title>
<link>https://privsec.dev/</link>
<description>Recent content on PrivSec.dev</description>
<generator>Hugo -- gohugo.io</generator>
<lastBuildDate>Wed, 30 Mar 2022 21:23:12 +0000</lastBuildDate><atom:link href="https://privsec.dev/index.xml" rel="self" type="application/rss+xml" />
<item>
<title>Docker and OCI Hardening</title>
<link>https://privsec.dev/os/docker-and-oci-hardening/</link>
<pubDate>Wed, 30 Mar 2022 21:23:12 +0000</pubDate>
<guid>https://privsec.dev/os/docker-and-oci-hardening/</guid>
<description>Containers aren&amp;rsquo;t that new fancy thing anymore, but they were a big deal. And they still are. They are a concrete solution to the following problem:
- Hey, your software doesn&amp;rsquo;t work&amp;hellip;
- Sorry, it works on my computer! Can&amp;rsquo;t help you.
Whether we like them or not, containers are here to stay. Their expressiveness and semantics allow for an abstraction of the OS dependencies that a software has, the latter being often dynamically linked against certain libraries.</description>
</item>
<item>
<title>F-Droid Security Analysis</title>
<link>https://privsec.dev/apps/f-droid-security-analysis/</link>
<pubDate>Sun, 02 Jan 2022 21:28:31 +0000</pubDate>
<guid>https://privsec.dev/apps/f-droid-security-analysis/</guid>
<description>F-Droid is a popular alternative app repository for Android, especially known for its main repository dedicated to free and open-source software. F-Droid is often recommended among security and privacy enthusiasts, but how does it stack up against Play Store in practice? This write-up will attempt to emphasize major security issues with F-Droid that you should consider.
Before we start, a few things to keep in mind:
The main goal of this write-up was to inform users so they can make responsible choices, not to trash someone else&amp;rsquo;s work.</description>
</item>
<generator>Hugo -- gohugo.io</generator><atom:link href="https://privsec.dev/index.xml" rel="self" type="application/rss+xml" />
<item>
<title>About Us</title>
<link>https://privsec.dev/about/</link>
@ -41,6 +17,18 @@ Tommy System Administrator. Benevolent dictator for life @privsec.dev.
Website: tommytran.io</description>
</item>
<item>
<title>Docker and OCI Hardening</title>
<link>https://privsec.dev/os/docker-and-oci-hardening/</link>
<pubDate>Mon, 01 Jan 0001 00:00:00 +0000</pubDate>
<guid>https://privsec.dev/os/docker-and-oci-hardening/</guid>
<description>Containers aren&amp;rsquo;t that new fancy thing anymore, but they were a big deal. And they still are. They are a concrete solution to the following problem:
- Hey, your software doesn&amp;rsquo;t work&amp;hellip;
- Sorry, it works on my computer! Can&amp;rsquo;t help you.
Whether we like them or not, containers are here to stay. Their expressiveness and semantics allow for an abstraction of the OS dependencies that a software has, the latter being often dynamically linked against certain libraries.</description>
</item>
<item>
<title>Donate</title>
<link>https://privsec.dev/donate/</link>
@ -50,6 +38,17 @@ Website: tommytran.io</description>
<description>The domain costs us $12/year to renew from Google. We got our repository hosted for free on GitHub. We got our site hosted for free with Firebase. It costs Tommy ~$20/month to run the mail server, but that server is used for a bunch of his projects, not just PrivSec, and we doubt it will be used that much anyways. The point is, this website does not cost much to run, and as such we will not be accepting donation as a project.</description>
</item>
<item>
<title>F-Droid Security Analysis</title>
<link>https://privsec.dev/apps/f-droid-security-analysis/</link>
<pubDate>Mon, 01 Jan 0001 00:00:00 +0000</pubDate>
<guid>https://privsec.dev/apps/f-droid-security-analysis/</guid>
<description>F-Droid is a popular alternative app repository for Android, especially known for its main repository dedicated to free and open-source software. F-Droid is often recommended among security and privacy enthusiasts, but how does it stack up against Play Store in practice? This write-up will attempt to emphasize major security issues with F-Droid that you should consider.
Before we start, a few things to keep in mind:
The main goal of this write-up was to inform users so they can make responsible choices, not to trash someone else&amp;rsquo;s work.</description>
</item>
<item>
<title>Linux Insecurities</title>
<link>https://privsec.dev/os/linux-insecurities/</link>
@ -70,5 +69,15 @@ There is already a very indepth technical blog explaning the various security we
Common protocols Email and SMS MFA Email and SMS MFA are examples of the weaker MFA protocols. Email MFA is not great as whoever controls your email account can typically both reset your password and recieve your MFA verification.</description>
</item>
<item>
<title>Securing OpenSSH with FIDO2</title>
<link>https://privsec.dev/os/securing-openssh-with-fido2/</link>
<pubDate>Mon, 01 Jan 0001 00:00:00 +0000</pubDate>
<guid>https://privsec.dev/os/securing-openssh-with-fido2/</guid>
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<a href=index.xml title=RSS aria-label=RSS><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentcolor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" height="23"><path d="M4 11a9 9 0 019 9"/><path d="M4 4a16 16 0 0116 16"/><circle cx="5" cy="19" r="1"/></svg></a></h1></header><article class=post-entry><header class=entry-header><h2>Docker and OCI Hardening</h2></header><div class=entry-content><p>Containers aren’t that new fancy thing anymore, but they were a big deal. And they still are. They are a concrete solution to the following problem:
- Hey, your software doesn’t work…
- Sorry, it works on my computer! Can’t help you.
Whether we like them or not, containers are here to stay. Their expressiveness and semantics allow for an abstraction of the OS dependencies that a software has, the latter being often dynamically linked against certain libraries....</p></div><footer class=entry-footer><span title='2022-03-30 21:23:12 +0000 UTC'>March 30, 2022</span>&nbsp;·&nbsp;19 min&nbsp;·&nbsp;3925 words&nbsp;·&nbsp;Wonderfall</footer><a class=entry-link aria-label="post link to Docker and OCI Hardening" href=https://privsec.dev/os/docker-and-oci-hardening/></a></article><article class=post-entry><header class=entry-header><h2>Linux Insecurities</h2></header><div class=entry-content><p>There is a common misconception among privacy communities that Linux is one of the more secure operating systems, either because it is open source or because it is widely used in the cloud. This is however, a far cry from reality.
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Whether we like them or not, containers are here to stay. Their expressiveness and semantics allow for an abstraction of the OS dependencies that a software has, the latter being often dynamically linked against certain libraries....</p></div><footer class=entry-footer>19 min&nbsp;·&nbsp;3925 words&nbsp;·&nbsp;Wonderfall</footer><a class=entry-link aria-label="post link to Docker and OCI Hardening" href=https://privsec.dev/os/docker-and-oci-hardening/></a></article><article class=post-entry><header class=entry-header><h2>Linux Insecurities</h2></header><div class=entry-content><p>There is a common misconception among privacy communities that Linux is one of the more secure operating systems, either because it is open source or because it is widely used in the cloud. This is however, a far cry from reality.
There is already a very indepth technical blog explaning the various security weaknesses of Linux by Madaidan, Whonix’s Security Researcher. This page will attempt to address some of the questions commonly raised in reaction to his blog post....</p></div><footer class=entry-footer>1 min&nbsp;·&nbsp;86 words&nbsp;·&nbsp;Tommy</footer><a class=entry-link aria-label="post link to Linux Insecurities" href=https://privsec.dev/os/linux-insecurities/></a></article><article class=post-entry><header class=entry-header><h2>Securing OpenSSH with FIDO2</h2></header><div class=entry-content><p>Passwordless authentication with OpenSSH keys has been the de facto security standard for years. SSH keys are more robust since they’re cryptographically sane by default, and are therefore resilient to most bruteforce atacks. They’re also easier to manage while enabling a form of decentralized authentication (it’s easy and painless to revoke them). So, what’s the next step? And more exactly, why would one need something even better?
Why? The main problem with SSH keys is that they’re not magic: they consist of a key pair, of which the private key is stored on your disk....</p></div><footer class=entry-footer>5 min&nbsp;·&nbsp;863 words&nbsp;·&nbsp;Wonderfall</footer><a class=entry-link aria-label="post link to Securing OpenSSH with FIDO2" href=https://privsec.dev/os/securing-openssh-with-fido2/></a></article></main><footer class=footer><span>&copy; 2022 <a href=https://privsec.dev>PrivSec.dev</a></span>
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@ -28,5 +27,15 @@ Whether we like them or not, containers are here to stay. Their expressiveness a
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<!doctype html><html lang=en dir=auto><head><meta charset=utf-8><meta http-equiv=x-ua-compatible content="IE=edge"><meta name=viewport content="width=device-width,initial-scale=1,shrink-to-fit=no"><meta name=robots content="index, follow"><title>android | PrivSec.dev</title><meta name=keywords content><meta name=description content><meta name=author content="PrivSec Team"><link rel=canonical href=https://privsec.dev/tags/android/><link crossorigin=anonymous href=/assets/css/stylesheet.8b523f1730c922e314350296d83fd666efa16519ca136320a93df674d00b6325.css integrity="sha256-i1I/FzDJIuMUNQKW2D/WZu+hZRnKE2MgqT32dNALYyU=" rel="preload stylesheet" as=style><link rel=icon href=https://privsec.dev/%3Clink%20/%20abs%20url%3E><link rel=icon type=image/png sizes=16x16 href=https://privsec.dev/%3Clink%20/%20abs%20url%3E><link rel=icon type=image/png sizes=32x32 href=https://privsec.dev/%3Clink%20/%20abs%20url%3E><link rel=apple-touch-icon href=https://privsec.dev/%3Clink%20/%20abs%20url%3E><link rel=mask-icon href=https://privsec.dev/%3Clink%20/%20abs%20url%3E><meta name=theme-color content="#2e2e33"><meta name=msapplication-TileColor content="#2e2e33"><link rel=alternate type=application/rss+xml href=https://privsec.dev/tags/android/index.xml><noscript><style>#theme-toggle,.top-link{display:none}</style></noscript><meta property="og:title" content="android"><meta property="og:description" content><meta property="og:type" content="website"><meta property="og:url" content="https://privsec.dev/tags/android/"><meta name=twitter:card content="summary"><meta name=twitter:title content="android"><meta name=twitter:description content></head><body class="list dark" id=top><script>localStorage.getItem("pref-theme")==="light"&&document.body.classList.remove("dark")</script><header class=header><nav class=nav><div class=logo><a href=https://privsec.dev accesskey=h title="PrivSec.dev (Alt + H)">PrivSec.dev</a><div class=logo-switches><button id=theme-toggle accesskey=t title="(Alt + T)"><svg id="moon" xmlns="http://www.w3.org/2000/svg" width="24" height="18" viewBox="0 0 24 24" fill="none" stroke="currentcolor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M21 12.79A9 9 0 1111.21 3 7 7 0 0021 12.79z"/></svg><svg id="sun" xmlns="http://www.w3.org/2000/svg" width="24" height="18" viewBox="0 0 24 24" fill="none" stroke="currentcolor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="5"/><line x1="12" y1="1" x2="12" y2="3"/><line x1="12" y1="21" x2="12" y2="23"/><line x1="4.22" y1="4.22" x2="5.64" y2="5.64"/><line x1="18.36" y1="18.36" x2="19.78" y2="19.78"/><line x1="1" y1="12" x2="3" y2="12"/><line x1="21" y1="12" x2="23" y2="12"/><line x1="4.22" y1="19.78" x2="5.64" y2="18.36"/><line x1="18.36" y1="5.64" x2="19.78" y2="4.22"/></svg></button></div></div><ul id=menu><li><a href=https://privsec.dev/knowledge/ title="Knowledge Base"><span>Knowledge Base</span></a></li><li><a href=https://privsec.dev/os/ title="Operating Systems"><span>Operating Systems</span></a></li><li><a href=https://privsec.dev/apps/ title=Applications><span>Applications</span></a></li><li><a href=https://privsec.dev/providers/ title=Providers><span>Providers</span></a></li></ul></nav></header><main class=main><header class=page-header><div class=breadcrumbs><a href=https://privsec.dev>Home</a>&nbsp;»&nbsp;<a href=https://privsec.dev/tags/>Tags</a></div><h1>android
<a href=index.xml title=RSS aria-label=RSS><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentcolor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" height="23"><path d="M4 11a9 9 0 019 9"/><path d="M4 4a16 16 0 0116 16"/><circle cx="5" cy="19" r="1"/></svg></a></h1></header><article class="post-entry tag-entry"><header class=entry-header><h2>F-Droid Security Analysis</h2></header><div class=entry-content><p>F-Droid is a popular alternative app repository for Android, especially known for its main repository dedicated to free and open-source software. F-Droid is often recommended among security and privacy enthusiasts, but how does it stack up against Play Store in practice? This write-up will attempt to emphasize major security issues with F-Droid that you should consider.
Before we start, a few things to keep in mind:
The main goal of this write-up was to inform users so they can make responsible choices, not to trash someone else’s work....</p></div><footer class=entry-footer><span title='2022-01-02 21:28:31 +0000 UTC'>January 2, 2022</span>&nbsp;·&nbsp;26 min&nbsp;·&nbsp;5392 words&nbsp;·&nbsp;Wonderfall</footer><a class=entry-link aria-label="post link to F-Droid Security Analysis" href=https://privsec.dev/apps/f-droid-security-analysis/></a></article></main><footer class=footer><span>&copy; 2022 <a href=https://privsec.dev>PrivSec.dev</a></span>
The main goal of this write-up was to inform users so they can make responsible choices, not to trash someone else’s work....</p></div><footer class=entry-footer>25 min&nbsp;·&nbsp;5298 words&nbsp;·&nbsp;Wonderfall</footer><a class=entry-link aria-label="post link to F-Droid Security Analysis" href=https://privsec.dev/apps/f-droid-security-analysis/></a></article></main><footer class=footer><span>&copy; 2022 <a href=https://privsec.dev>PrivSec.dev</a></span>
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<a href=index.xml title=RSS aria-label=RSS><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentcolor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" height="23"><path d="M4 11a9 9 0 019 9"/><path d="M4 4a16 16 0 0116 16"/><circle cx="5" cy="19" r="1"/></svg></a></h1></header><article class="post-entry tag-entry"><header class=entry-header><h2>Docker and OCI Hardening</h2></header><div class=entry-content><p>Containers aren’t that new fancy thing anymore, but they were a big deal. And they still are. They are a concrete solution to the following problem:
- Hey, your software doesn’t work…
- Sorry, it works on my computer! Can’t help you.
Whether we like them or not, containers are here to stay. Their expressiveness and semantics allow for an abstraction of the OS dependencies that a software has, the latter being often dynamically linked against certain libraries....</p></div><footer class=entry-footer><span title='2022-03-30 21:23:12 +0000 UTC'>March 30, 2022</span>&nbsp;·&nbsp;19 min&nbsp;·&nbsp;3925 words&nbsp;·&nbsp;Wonderfall</footer><a class=entry-link aria-label="post link to Docker and OCI Hardening" href=https://privsec.dev/os/docker-and-oci-hardening/></a></article></main><footer class=footer><span>&copy; 2022 <a href=https://privsec.dev>PrivSec.dev</a></span>
Whether we like them or not, containers are here to stay. Their expressiveness and semantics allow for an abstraction of the OS dependencies that a software has, the latter being often dynamically linked against certain libraries....</p></div><footer class=entry-footer>19 min&nbsp;·&nbsp;3925 words&nbsp;·&nbsp;Wonderfall</footer><a class=entry-link aria-label="post link to Docker and OCI Hardening" href=https://privsec.dev/os/docker-and-oci-hardening/></a></article></main><footer class=footer><span>&copy; 2022 <a href=https://privsec.dev>PrivSec.dev</a></span>
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<title>container on PrivSec.dev</title>
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<pubDate>Mon, 01 Jan 0001 00:00:00 +0000</pubDate>
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<description>Containers aren&amp;rsquo;t that new fancy thing anymore, but they were a big deal. And they still are. They are a concrete solution to the following problem:

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<!doctype html><html lang=en dir=auto><head><meta charset=utf-8><meta http-equiv=x-ua-compatible content="IE=edge"><meta name=viewport content="width=device-width,initial-scale=1,shrink-to-fit=no"><meta name=robots content="index, follow"><title>Tags | PrivSec.dev</title><meta name=keywords content><meta name=description content><meta name=author content="PrivSec Team"><link rel=canonical href=https://privsec.dev/tags/><link crossorigin=anonymous href=/assets/css/stylesheet.8b523f1730c922e314350296d83fd666efa16519ca136320a93df674d00b6325.css integrity="sha256-i1I/FzDJIuMUNQKW2D/WZu+hZRnKE2MgqT32dNALYyU=" rel="preload stylesheet" as=style><link rel=icon href=https://privsec.dev/%3Clink%20/%20abs%20url%3E><link rel=icon type=image/png sizes=16x16 href=https://privsec.dev/%3Clink%20/%20abs%20url%3E><link rel=icon type=image/png sizes=32x32 href=https://privsec.dev/%3Clink%20/%20abs%20url%3E><link rel=apple-touch-icon href=https://privsec.dev/%3Clink%20/%20abs%20url%3E><link rel=mask-icon href=https://privsec.dev/%3Clink%20/%20abs%20url%3E><meta name=theme-color content="#2e2e33"><meta name=msapplication-TileColor content="#2e2e33"><link rel=alternate type=application/rss+xml href=https://privsec.dev/tags/index.xml><noscript><style>#theme-toggle,.top-link{display:none}</style></noscript><meta property="og:title" content="Tags"><meta property="og:description" content><meta property="og:type" content="website"><meta property="og:url" content="https://privsec.dev/tags/"><meta name=twitter:card content="summary"><meta name=twitter:title content="Tags"><meta name=twitter:description content></head><body class="list dark" id=top><script>localStorage.getItem("pref-theme")==="light"&&document.body.classList.remove("dark")</script><header class=header><nav class=nav><div class=logo><a href=https://privsec.dev accesskey=h title="PrivSec.dev (Alt + H)">PrivSec.dev</a><div class=logo-switches><button id=theme-toggle accesskey=t title="(Alt + T)"><svg id="moon" xmlns="http://www.w3.org/2000/svg" width="24" height="18" viewBox="0 0 24 24" fill="none" stroke="currentcolor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M21 12.79A9 9 0 1111.21 3 7 7 0 0021 12.79z"/></svg><svg id="sun" xmlns="http://www.w3.org/2000/svg" width="24" height="18" viewBox="0 0 24 24" fill="none" stroke="currentcolor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="5"/><line x1="12" y1="1" x2="12" y2="3"/><line x1="12" y1="21" x2="12" y2="23"/><line x1="4.22" y1="4.22" x2="5.64" y2="5.64"/><line x1="18.36" y1="18.36" x2="19.78" y2="19.78"/><line x1="1" y1="12" x2="3" y2="12"/><line x1="21" y1="12" x2="23" y2="12"/><line x1="4.22" y1="19.78" x2="5.64" y2="18.36"/><line x1="18.36" y1="5.64" x2="19.78" y2="4.22"/></svg></button></div></div><ul id=menu><li><a href=https://privsec.dev/knowledge/ title="Knowledge Base"><span>Knowledge Base</span></a></li><li><a href=https://privsec.dev/os/ title="Operating Systems"><span>Operating Systems</span></a></li><li><a href=https://privsec.dev/apps/ title=Applications><span>Applications</span></a></li><li><a href=https://privsec.dev/providers/ title=Providers><span>Providers</span></a></li></ul></nav></header><main class=main><header class=page-header><h1>Tags</h1></header><ul class=terms-tags><li><a href=https://privsec.dev/tags/android/>android <sup><strong><sup>1</sup></strong></sup></a></li><li><a href=https://privsec.dev/tags/container/>container <sup><strong><sup>1</sup></strong></sup></a></li><li><a href=https://privsec.dev/tags/knowledge-base/>knowledge base <sup><strong><sup>1</sup></strong></sup></a></li><li><a href=https://privsec.dev/tags/linux/>linux <sup><strong><sup>2</sup></strong></sup></a></li><li><a href=https://privsec.dev/tags/operating-system/>operating system <sup><strong><sup>1</sup></strong></sup></a></li><li><a href=https://privsec.dev/tags/operating-systems/>operating systems <sup><strong><sup>1</sup></strong></sup></a></li><li><a href=https://privsec.dev/tags/security/>security <sup><strong><sup>4</sup></strong></sup></a></li><li><a href=https://privsec.dev/tags/software/>software <sup><strong><sup>1</sup></strong></sup></a></li></ul></main><footer class=footer><span>&copy; 2022 <a href=https://privsec.dev>PrivSec.dev</a></span>
<!doctype html><html lang=en dir=auto><head><meta charset=utf-8><meta http-equiv=x-ua-compatible content="IE=edge"><meta name=viewport content="width=device-width,initial-scale=1,shrink-to-fit=no"><meta name=robots content="index, follow"><title>Tags | PrivSec.dev</title><meta name=keywords content><meta name=description content><meta name=author content="PrivSec Team"><link rel=canonical href=https://privsec.dev/tags/><link crossorigin=anonymous href=/assets/css/stylesheet.8b523f1730c922e314350296d83fd666efa16519ca136320a93df674d00b6325.css integrity="sha256-i1I/FzDJIuMUNQKW2D/WZu+hZRnKE2MgqT32dNALYyU=" rel="preload stylesheet" as=style><link rel=icon href=https://privsec.dev/%3Clink%20/%20abs%20url%3E><link rel=icon type=image/png sizes=16x16 href=https://privsec.dev/%3Clink%20/%20abs%20url%3E><link rel=icon type=image/png sizes=32x32 href=https://privsec.dev/%3Clink%20/%20abs%20url%3E><link rel=apple-touch-icon href=https://privsec.dev/%3Clink%20/%20abs%20url%3E><link rel=mask-icon href=https://privsec.dev/%3Clink%20/%20abs%20url%3E><meta name=theme-color content="#2e2e33"><meta name=msapplication-TileColor content="#2e2e33"><link rel=alternate type=application/rss+xml href=https://privsec.dev/tags/index.xml><noscript><style>#theme-toggle,.top-link{display:none}</style></noscript><meta property="og:title" content="Tags"><meta property="og:description" content><meta property="og:type" content="website"><meta property="og:url" content="https://privsec.dev/tags/"><meta name=twitter:card content="summary"><meta name=twitter:title content="Tags"><meta name=twitter:description content></head><body class="list dark" id=top><script>localStorage.getItem("pref-theme")==="light"&&document.body.classList.remove("dark")</script><header class=header><nav class=nav><div class=logo><a href=https://privsec.dev accesskey=h title="PrivSec.dev (Alt + H)">PrivSec.dev</a><div class=logo-switches><button id=theme-toggle accesskey=t title="(Alt + T)"><svg id="moon" xmlns="http://www.w3.org/2000/svg" width="24" height="18" viewBox="0 0 24 24" fill="none" stroke="currentcolor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M21 12.79A9 9 0 1111.21 3 7 7 0 0021 12.79z"/></svg><svg id="sun" xmlns="http://www.w3.org/2000/svg" width="24" height="18" viewBox="0 0 24 24" fill="none" stroke="currentcolor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="5"/><line x1="12" y1="1" x2="12" y2="3"/><line x1="12" y1="21" x2="12" y2="23"/><line x1="4.22" y1="4.22" x2="5.64" y2="5.64"/><line x1="18.36" y1="18.36" x2="19.78" y2="19.78"/><line x1="1" y1="12" x2="3" y2="12"/><line x1="21" y1="12" x2="23" y2="12"/><line x1="4.22" y1="19.78" x2="5.64" y2="18.36"/><line x1="18.36" y1="5.64" x2="19.78" y2="4.22"/></svg></button></div></div><ul id=menu><li><a href=https://privsec.dev/knowledge/ title="Knowledge Base"><span>Knowledge Base</span></a></li><li><a href=https://privsec.dev/os/ title="Operating Systems"><span>Operating Systems</span></a></li><li><a href=https://privsec.dev/apps/ title=Applications><span>Applications</span></a></li><li><a href=https://privsec.dev/providers/ title=Providers><span>Providers</span></a></li></ul></nav></header><main class=main><header class=page-header><h1>Tags</h1></header><ul class=terms-tags><li><a href=https://privsec.dev/tags/android/>android <sup><strong><sup>1</sup></strong></sup></a></li><li><a href=https://privsec.dev/tags/container/>container <sup><strong><sup>1</sup></strong></sup></a></li><li><a href=https://privsec.dev/tags/knowledge-base/>knowledge base <sup><strong><sup>1</sup></strong></sup></a></li><li><a href=https://privsec.dev/tags/linux/>linux <sup><strong><sup>3</sup></strong></sup></a></li><li><a href=https://privsec.dev/tags/operating-system/>operating system <sup><strong><sup>1</sup></strong></sup></a></li><li><a href=https://privsec.dev/tags/operating-systems/>operating systems <sup><strong><sup>2</sup></strong></sup></a></li><li><a href=https://privsec.dev/tags/security/>security <sup><strong><sup>5</sup></strong></sup></a></li><li><a href=https://privsec.dev/tags/software/>software <sup><strong><sup>1</sup></strong></sup></a></li></ul></main><footer class=footer><span>&copy; 2022 <a href=https://privsec.dev>PrivSec.dev</a></span>
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<title>Tags on PrivSec.dev</title>
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<title>operating systems</title>
<link>https://privsec.dev/tags/operating-systems/</link>
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<title>security</title>
<link>https://privsec.dev/tags/security/</link>
<pubDate>Wed, 30 Mar 2022 21:23:12 +0000</pubDate>
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<pubDate>Sun, 02 Jan 2022 21:28:31 +0000</pubDate>
<pubDate>Mon, 01 Jan 0001 00:00:00 +0000</pubDate>
<guid>https://privsec.dev/tags/android/</guid>
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<title>software</title>
<link>https://privsec.dev/tags/software/</link>
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@ -69,6 +32,15 @@
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<title>linux</title>
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@ -78,5 +50,32 @@
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<title>software</title>
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5
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<a href=index.xml title=RSS aria-label=RSS><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentcolor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" height="23"><path d="M4 11a9 9 0 019 9"/><path d="M4 4a16 16 0 0116 16"/><circle cx="5" cy="19" r="1"/></svg></a></h1></header><article class="post-entry tag-entry"><header class=entry-header><h2>Docker and OCI Hardening</h2></header><div class=entry-content><p>Containers aren’t that new fancy thing anymore, but they were a big deal. And they still are. They are a concrete solution to the following problem:
- Hey, your software doesn’t work…
- Sorry, it works on my computer! Can’t help you.
Whether we like them or not, containers are here to stay. Their expressiveness and semantics allow for an abstraction of the OS dependencies that a software has, the latter being often dynamically linked against certain libraries....</p></div><footer class=entry-footer><span title='2022-03-30 21:23:12 +0000 UTC'>March 30, 2022</span>&nbsp;·&nbsp;19 min&nbsp;·&nbsp;3925 words&nbsp;·&nbsp;Wonderfall</footer><a class=entry-link aria-label="post link to Docker and OCI Hardening" href=https://privsec.dev/os/docker-and-oci-hardening/></a></article><article class="post-entry tag-entry"><header class=entry-header><h2>Linux Insecurities</h2></header><div class=entry-content><p>There is a common misconception among privacy communities that Linux is one of the more secure operating systems, either because it is open source or because it is widely used in the cloud. This is however, a far cry from reality.
There is already a very indepth technical blog explaning the various security weaknesses of Linux by Madaidan, Whonix’s Security Researcher. This page will attempt to address some of the questions commonly raised in reaction to his blog post....</p></div><footer class=entry-footer>1 min&nbsp;·&nbsp;86 words&nbsp;·&nbsp;Tommy</footer><a class=entry-link aria-label="post link to Linux Insecurities" href=https://privsec.dev/os/linux-insecurities/></a></article></main><footer class=footer><span>&copy; 2022 <a href=https://privsec.dev>PrivSec.dev</a></span>
Whether we like them or not, containers are here to stay. Their expressiveness and semantics allow for an abstraction of the OS dependencies that a software has, the latter being often dynamically linked against certain libraries....</p></div><footer class=entry-footer>19 min&nbsp;·&nbsp;3925 words&nbsp;·&nbsp;Wonderfall</footer><a class=entry-link aria-label="post link to Docker and OCI Hardening" href=https://privsec.dev/os/docker-and-oci-hardening/></a></article><article class="post-entry tag-entry"><header class=entry-header><h2>Linux Insecurities</h2></header><div class=entry-content><p>There is a common misconception among privacy communities that Linux is one of the more secure operating systems, either because it is open source or because it is widely used in the cloud. This is however, a far cry from reality.
There is already a very indepth technical blog explaning the various security weaknesses of Linux by Madaidan, Whonix’s Security Researcher. This page will attempt to address some of the questions commonly raised in reaction to his blog post....</p></div><footer class=entry-footer>1 min&nbsp;·&nbsp;86 words&nbsp;·&nbsp;Tommy</footer><a class=entry-link aria-label="post link to Linux Insecurities" href=https://privsec.dev/os/linux-insecurities/></a></article><article class="post-entry tag-entry"><header class=entry-header><h2>Securing OpenSSH with FIDO2</h2></header><div class=entry-content><p>Passwordless authentication with OpenSSH keys has been the de facto security standard for years. SSH keys are more robust since they’re cryptographically sane by default, and are therefore resilient to most bruteforce atacks. They’re also easier to manage while enabling a form of decentralized authentication (it’s easy and painless to revoke them). So, what’s the next step? And more exactly, why would one need something even better?
Why? The main problem with SSH keys is that they’re not magic: they consist of a key pair, of which the private key is stored on your disk....</p></div><footer class=entry-footer>5 min&nbsp;·&nbsp;863 words&nbsp;·&nbsp;Wonderfall</footer><a class=entry-link aria-label="post link to Securing OpenSSH with FIDO2" href=https://privsec.dev/os/securing-openssh-with-fido2/></a></article></main><footer class=footer><span>&copy; 2022 <a href=https://privsec.dev>PrivSec.dev</a></span>
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15
public/tags/linux/index.xml
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@ -4,12 +4,11 @@
<title>linux on PrivSec.dev</title>
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<title>Docker and OCI Hardening</title>
<link>https://privsec.dev/os/docker-and-oci-hardening/</link>
<pubDate>Wed, 30 Mar 2022 21:23:12 +0000</pubDate>
<pubDate>Mon, 01 Jan 0001 00:00:00 +0000</pubDate>
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<description>Containers aren&amp;rsquo;t that new fancy thing anymore, but they were a big deal. And they still are. They are a concrete solution to the following problem:
@ -28,5 +27,15 @@ Whether we like them or not, containers are here to stay. Their expressiveness a
There is already a very indepth technical blog explaning the various security weaknesses of Linux by Madaidan, Whonix&amp;rsquo;s Security Researcher. This page will attempt to address some of the questions commonly raised in reaction to his blog post.</description>
</item>
<item>
<title>Securing OpenSSH with FIDO2</title>
<link>https://privsec.dev/os/securing-openssh-with-fido2/</link>
<pubDate>Mon, 01 Jan 0001 00:00:00 +0000</pubDate>
<guid>https://privsec.dev/os/securing-openssh-with-fido2/</guid>
<description>Passwordless authentication with OpenSSH keys has been the de facto security standard for years. SSH keys are more robust since they&amp;rsquo;re cryptographically sane by default, and are therefore resilient to most bruteforce atacks. They&amp;rsquo;re also easier to manage while enabling a form of decentralized authentication (it&amp;rsquo;s easy and painless to revoke them). So, what&amp;rsquo;s the next step? And more exactly, why would one need something even better?
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3
public/tags/operating-systems/index.html
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@ -2,7 +2,8 @@
<a href=index.xml title=RSS aria-label=RSS><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentcolor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" height="23"><path d="M4 11a9 9 0 019 9"/><path d="M4 4a16 16 0 0116 16"/><circle cx="5" cy="19" r="1"/></svg></a></h1></header><article class="post-entry tag-entry"><header class=entry-header><h2>Docker and OCI Hardening</h2></header><div class=entry-content><p>Containers aren’t that new fancy thing anymore, but they were a big deal. And they still are. They are a concrete solution to the following problem:
- Hey, your software doesn’t work…
- Sorry, it works on my computer! Can’t help you.
Whether we like them or not, containers are here to stay. Their expressiveness and semantics allow for an abstraction of the OS dependencies that a software has, the latter being often dynamically linked against certain libraries....</p></div><footer class=entry-footer><span title='2022-03-30 21:23:12 +0000 UTC'>March 30, 2022</span>&nbsp;·&nbsp;19 min&nbsp;·&nbsp;3925 words&nbsp;·&nbsp;Wonderfall</footer><a class=entry-link aria-label="post link to Docker and OCI Hardening" href=https://privsec.dev/os/docker-and-oci-hardening/></a></article></main><footer class=footer><span>&copy; 2022 <a href=https://privsec.dev>PrivSec.dev</a></span>
Whether we like them or not, containers are here to stay. Their expressiveness and semantics allow for an abstraction of the OS dependencies that a software has, the latter being often dynamically linked against certain libraries....</p></div><footer class=entry-footer>19 min&nbsp;·&nbsp;3925 words&nbsp;·&nbsp;Wonderfall</footer><a class=entry-link aria-label="post link to Docker and OCI Hardening" href=https://privsec.dev/os/docker-and-oci-hardening/></a></article><article class="post-entry tag-entry"><header class=entry-header><h2>Securing OpenSSH with FIDO2</h2></header><div class=entry-content><p>Passwordless authentication with OpenSSH keys has been the de facto security standard for years. SSH keys are more robust since they’re cryptographically sane by default, and are therefore resilient to most bruteforce atacks. They’re also easier to manage while enabling a form of decentralized authentication (it’s easy and painless to revoke them). So, what’s the next step? And more exactly, why would one need something even better?
Why? The main problem with SSH keys is that they’re not magic: they consist of a key pair, of which the private key is stored on your disk....</p></div><footer class=entry-footer>5 min&nbsp;·&nbsp;863 words&nbsp;·&nbsp;Wonderfall</footer><a class=entry-link aria-label="post link to Securing OpenSSH with FIDO2" href=https://privsec.dev/os/securing-openssh-with-fido2/></a></article></main><footer class=footer><span>&copy; 2022 <a href=https://privsec.dev>PrivSec.dev</a></span>
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15
public/tags/operating-systems/index.xml
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@ -4,12 +4,11 @@
<title>operating systems on PrivSec.dev</title>
<link>https://privsec.dev/tags/operating-systems/</link>
<description>Recent content in operating systems on PrivSec.dev</description>
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<title>Docker and OCI Hardening</title>
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@ -18,5 +17,15 @@
Whether we like them or not, containers are here to stay. Their expressiveness and semantics allow for an abstraction of the OS dependencies that a software has, the latter being often dynamically linked against certain libraries.</description>
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<title>Securing OpenSSH with FIDO2</title>
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7
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@ -2,11 +2,12 @@
<a href=index.xml title=RSS aria-label=RSS><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentcolor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" height="23"><path d="M4 11a9 9 0 019 9"/><path d="M4 4a16 16 0 0116 16"/><circle cx="5" cy="19" r="1"/></svg></a></h1></header><article class="post-entry tag-entry"><header class=entry-header><h2>Docker and OCI Hardening</h2></header><div class=entry-content><p>Containers aren’t that new fancy thing anymore, but they were a big deal. And they still are. They are a concrete solution to the following problem:
- Hey, your software doesn’t work…
- Sorry, it works on my computer! Can’t help you.
Whether we like them or not, containers are here to stay. Their expressiveness and semantics allow for an abstraction of the OS dependencies that a software has, the latter being often dynamically linked against certain libraries....</p></div><footer class=entry-footer><span title='2022-03-30 21:23:12 +0000 UTC'>March 30, 2022</span>&nbsp;·&nbsp;19 min&nbsp;·&nbsp;3925 words&nbsp;·&nbsp;Wonderfall</footer><a class=entry-link aria-label="post link to Docker and OCI Hardening" href=https://privsec.dev/os/docker-and-oci-hardening/></a></article><article class="post-entry tag-entry"><header class=entry-header><h2>F-Droid Security Analysis</h2></header><div class=entry-content><p>F-Droid is a popular alternative app repository for Android, especially known for its main repository dedicated to free and open-source software. F-Droid is often recommended among security and privacy enthusiasts, but how does it stack up against Play Store in practice? This write-up will attempt to emphasize major security issues with F-Droid that you should consider.
Whether we like them or not, containers are here to stay. Their expressiveness and semantics allow for an abstraction of the OS dependencies that a software has, the latter being often dynamically linked against certain libraries....</p></div><footer class=entry-footer>19 min&nbsp;·&nbsp;3925 words&nbsp;·&nbsp;Wonderfall</footer><a class=entry-link aria-label="post link to Docker and OCI Hardening" href=https://privsec.dev/os/docker-and-oci-hardening/></a></article><article class="post-entry tag-entry"><header class=entry-header><h2>F-Droid Security Analysis</h2></header><div class=entry-content><p>F-Droid is a popular alternative app repository for Android, especially known for its main repository dedicated to free and open-source software. F-Droid is often recommended among security and privacy enthusiasts, but how does it stack up against Play Store in practice? This write-up will attempt to emphasize major security issues with F-Droid that you should consider.
Before we start, a few things to keep in mind:
The main goal of this write-up was to inform users so they can make responsible choices, not to trash someone else’s work....</p></div><footer class=entry-footer><span title='2022-01-02 21:28:31 +0000 UTC'>January 2, 2022</span>&nbsp;·&nbsp;26 min&nbsp;·&nbsp;5392 words&nbsp;·&nbsp;Wonderfall</footer><a class=entry-link aria-label="post link to F-Droid Security Analysis" href=https://privsec.dev/apps/f-droid-security-analysis/></a></article><article class="post-entry tag-entry"><header class=entry-header><h2>Linux Insecurities</h2></header><div class=entry-content><p>There is a common misconception among privacy communities that Linux is one of the more secure operating systems, either because it is open source or because it is widely used in the cloud. This is however, a far cry from reality.
The main goal of this write-up was to inform users so they can make responsible choices, not to trash someone else’s work....</p></div><footer class=entry-footer>25 min&nbsp;·&nbsp;5298 words&nbsp;·&nbsp;Wonderfall</footer><a class=entry-link aria-label="post link to F-Droid Security Analysis" href=https://privsec.dev/apps/f-droid-security-analysis/></a></article><article class="post-entry tag-entry"><header class=entry-header><h2>Linux Insecurities</h2></header><div class=entry-content><p>There is a common misconception among privacy communities that Linux is one of the more secure operating systems, either because it is open source or because it is widely used in the cloud. This is however, a far cry from reality.
There is already a very indepth technical blog explaning the various security weaknesses of Linux by Madaidan, Whonix’s Security Researcher. This page will attempt to address some of the questions commonly raised in reaction to his blog post....</p></div><footer class=entry-footer>1 min&nbsp;·&nbsp;86 words&nbsp;·&nbsp;Tommy</footer><a class=entry-link aria-label="post link to Linux Insecurities" href=https://privsec.dev/os/linux-insecurities/></a></article><article class="post-entry tag-entry"><header class=entry-header><h2>Multi-factor Authentication</h2></header><div class=entry-content><p>Multi-factor authentication is a security mechanism that requires additional verification beyond your username (or email) and password. This usually comes in the form of a one time passcode, a push notification, or plugging in and tapping a hardware security key.
Common protocols Email and SMS MFA Email and SMS MFA are examples of the weaker MFA protocols. Email MFA is not great as whoever controls your email account can typically both reset your password and recieve your MFA verification....</p></div><footer class=entry-footer>6 min&nbsp;·&nbsp;1225 words&nbsp;·&nbsp;Tommy</footer><a class=entry-link aria-label="post link to Multi-factor Authentication" href=https://privsec.dev/knowledge/multi-factor-authentication/></a></article></main><footer class=footer><span>&copy; 2022 <a href=https://privsec.dev>PrivSec.dev</a></span>
Common protocols Email and SMS MFA Email and SMS MFA are examples of the weaker MFA protocols. Email MFA is not great as whoever controls your email account can typically both reset your password and recieve your MFA verification....</p></div><footer class=entry-footer>6 min&nbsp;·&nbsp;1225 words&nbsp;·&nbsp;Tommy</footer><a class=entry-link aria-label="post link to Multi-factor Authentication" href=https://privsec.dev/knowledge/multi-factor-authentication/></a></article><article class="post-entry tag-entry"><header class=entry-header><h2>Securing OpenSSH with FIDO2</h2></header><div class=entry-content><p>Passwordless authentication with OpenSSH keys has been the de facto security standard for years. SSH keys are more robust since they’re cryptographically sane by default, and are therefore resilient to most bruteforce atacks. They’re also easier to manage while enabling a form of decentralized authentication (it’s easy and painless to revoke them). So, what’s the next step? And more exactly, why would one need something even better?
Why? The main problem with SSH keys is that they’re not magic: they consist of a key pair, of which the private key is stored on your disk....</p></div><footer class=entry-footer>5 min&nbsp;·&nbsp;863 words&nbsp;·&nbsp;Wonderfall</footer><a class=entry-link aria-label="post link to Securing OpenSSH with FIDO2" href=https://privsec.dev/os/securing-openssh-with-fido2/></a></article></main><footer class=footer><span>&copy; 2022 <a href=https://privsec.dev>PrivSec.dev</a></span>
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17
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@ -4,12 +4,11 @@
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<link>https://privsec.dev/os/docker-and-oci-hardening/</link>
<pubDate>Wed, 30 Mar 2022 21:23:12 +0000</pubDate>
<pubDate>Mon, 01 Jan 0001 00:00:00 +0000</pubDate>
<guid>https://privsec.dev/os/docker-and-oci-hardening/</guid>
<description>Containers aren&amp;rsquo;t that new fancy thing anymore, but they were a big deal. And they still are. They are a concrete solution to the following problem:
@ -21,7 +20,7 @@ Whether we like them or not, containers are here to stay. Their expressiveness a
<item>
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<link>https://privsec.dev/apps/f-droid-security-analysis/</link>
<pubDate>Sun, 02 Jan 2022 21:28:31 +0000</pubDate>
<pubDate>Mon, 01 Jan 0001 00:00:00 +0000</pubDate>
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@ -49,5 +48,15 @@ There is already a very indepth technical blog explaning the various security we
Common protocols Email and SMS MFA Email and SMS MFA are examples of the weaker MFA protocols. Email MFA is not great as whoever controls your email account can typically both reset your password and recieve your MFA verification.</description>
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<title>Securing OpenSSH with FIDO2</title>
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@ -1,7 +1,7 @@
<!doctype html><html lang=en dir=auto><head><meta charset=utf-8><meta http-equiv=x-ua-compatible content="IE=edge"><meta name=viewport content="width=device-width,initial-scale=1,shrink-to-fit=no"><meta name=robots content="index, follow"><title>software | PrivSec.dev</title><meta name=keywords content><meta name=description content><meta name=author content="PrivSec Team"><link rel=canonical href=https://privsec.dev/tags/software/><link crossorigin=anonymous href=/assets/css/stylesheet.8b523f1730c922e314350296d83fd666efa16519ca136320a93df674d00b6325.css integrity="sha256-i1I/FzDJIuMUNQKW2D/WZu+hZRnKE2MgqT32dNALYyU=" rel="preload stylesheet" as=style><link rel=icon href=https://privsec.dev/%3Clink%20/%20abs%20url%3E><link rel=icon type=image/png sizes=16x16 href=https://privsec.dev/%3Clink%20/%20abs%20url%3E><link rel=icon type=image/png sizes=32x32 href=https://privsec.dev/%3Clink%20/%20abs%20url%3E><link rel=apple-touch-icon href=https://privsec.dev/%3Clink%20/%20abs%20url%3E><link rel=mask-icon href=https://privsec.dev/%3Clink%20/%20abs%20url%3E><meta name=theme-color content="#2e2e33"><meta name=msapplication-TileColor content="#2e2e33"><link rel=alternate type=application/rss+xml href=https://privsec.dev/tags/software/index.xml><noscript><style>#theme-toggle,.top-link{display:none}</style></noscript><meta property="og:title" content="software"><meta property="og:description" content><meta property="og:type" content="website"><meta property="og:url" content="https://privsec.dev/tags/software/"><meta name=twitter:card content="summary"><meta name=twitter:title content="software"><meta name=twitter:description content></head><body class="list dark" id=top><script>localStorage.getItem("pref-theme")==="light"&&document.body.classList.remove("dark")</script><header class=header><nav class=nav><div class=logo><a href=https://privsec.dev accesskey=h title="PrivSec.dev (Alt + H)">PrivSec.dev</a><div class=logo-switches><button id=theme-toggle accesskey=t title="(Alt + T)"><svg id="moon" xmlns="http://www.w3.org/2000/svg" width="24" height="18" viewBox="0 0 24 24" fill="none" stroke="currentcolor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M21 12.79A9 9 0 1111.21 3 7 7 0 0021 12.79z"/></svg><svg id="sun" xmlns="http://www.w3.org/2000/svg" width="24" height="18" viewBox="0 0 24 24" fill="none" stroke="currentcolor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="5"/><line x1="12" y1="1" x2="12" y2="3"/><line x1="12" y1="21" x2="12" y2="23"/><line x1="4.22" y1="4.22" x2="5.64" y2="5.64"/><line x1="18.36" y1="18.36" x2="19.78" y2="19.78"/><line x1="1" y1="12" x2="3" y2="12"/><line x1="21" y1="12" x2="23" y2="12"/><line x1="4.22" y1="19.78" x2="5.64" y2="18.36"/><line x1="18.36" y1="5.64" x2="19.78" y2="4.22"/></svg></button></div></div><ul id=menu><li><a href=https://privsec.dev/knowledge/ title="Knowledge Base"><span>Knowledge Base</span></a></li><li><a href=https://privsec.dev/os/ title="Operating Systems"><span>Operating Systems</span></a></li><li><a href=https://privsec.dev/apps/ title=Applications><span>Applications</span></a></li><li><a href=https://privsec.dev/providers/ title=Providers><span>Providers</span></a></li></ul></nav></header><main class=main><header class=page-header><div class=breadcrumbs><a href=https://privsec.dev>Home</a>&nbsp;»&nbsp;<a href=https://privsec.dev/tags/>Tags</a></div><h1>software
<a href=index.xml title=RSS aria-label=RSS><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentcolor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" height="23"><path d="M4 11a9 9 0 019 9"/><path d="M4 4a16 16 0 0116 16"/><circle cx="5" cy="19" r="1"/></svg></a></h1></header><article class="post-entry tag-entry"><header class=entry-header><h2>F-Droid Security Analysis</h2></header><div class=entry-content><p>F-Droid is a popular alternative app repository for Android, especially known for its main repository dedicated to free and open-source software. F-Droid is often recommended among security and privacy enthusiasts, but how does it stack up against Play Store in practice? This write-up will attempt to emphasize major security issues with F-Droid that you should consider.
Before we start, a few things to keep in mind:
The main goal of this write-up was to inform users so they can make responsible choices, not to trash someone else’s work....</p></div><footer class=entry-footer><span title='2022-01-02 21:28:31 +0000 UTC'>January 2, 2022</span>&nbsp;·&nbsp;26 min&nbsp;·&nbsp;5392 words&nbsp;·&nbsp;Wonderfall</footer><a class=entry-link aria-label="post link to F-Droid Security Analysis" href=https://privsec.dev/apps/f-droid-security-analysis/></a></article></main><footer class=footer><span>&copy; 2022 <a href=https://privsec.dev>PrivSec.dev</a></span>
The main goal of this write-up was to inform users so they can make responsible choices, not to trash someone else’s work....</p></div><footer class=entry-footer>25 min&nbsp;·&nbsp;5298 words&nbsp;·&nbsp;Wonderfall</footer><a class=entry-link aria-label="post link to F-Droid Security Analysis" href=https://privsec.dev/apps/f-droid-security-analysis/></a></article></main><footer class=footer><span>&copy; 2022 <a href=https://privsec.dev>PrivSec.dev</a></span>
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5
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<pubDate>Mon, 01 Jan 0001 00:00:00 +0000</pubDate>
<guid>https://privsec.dev/apps/f-droid-security-analysis/</guid>
<description>F-Droid is a popular alternative app repository for Android, especially known for its main repository dedicated to free and open-source software. F-Droid is often recommended among security and privacy enthusiasts, but how does it stack up against Play Store in practice? This write-up will attempt to emphasize major security issues with F-Droid that you should consider.