118 lines
6.7 KiB
HTML
118 lines
6.7 KiB
HTML
<!DOCTYPE html>
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<html lang="en" prefix="og: http://ogp.me/ns#">
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<head>
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<meta charset="utf-8"/>
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<title>Usage | GrapheneOS</title>
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<meta name="description" content="Usage instructions for GrapheneOS, a security and privacy focused mobile OS with Android app compatibility."/>
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<meta name="theme-color" content="#212121"/>
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<meta name="viewport" content="width=device-width, initial-scale=1"/>
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<meta property="og:title" content="GrapheneOS usage documentation"/>
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<meta property="og:description" content="Usage instructions for GrapheneOS, a security and privacy focused mobile OS with Android app compatibility."/>
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<meta property="og:type" content="website"/>
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<meta property="og:image" content="https://grapheneos.org/opengraph.png"/>
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<meta property="og:image:width" content="512"/>
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<meta property="og:image:height" content="512"/>
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<meta property="og:image:alt" content="GrapheneOS logo"/>
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<meta property="og:url" content="https://grapheneos.org/usage"/>
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<meta property="og:site_name" content="GrapheneOS"/>
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<link rel="stylesheet" href="/grapheneos.css?5"/>
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<link rel="manifest" href="/manifest.webmanifest"/>
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<link rel="canonical" href="https://grapheneos.org/usage"/>
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</head>
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<body>
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<nav>
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<ul>
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<li><a href="/">GrapheneOS</a></li>
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<li><a href="/install">Install</a></li>
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<li><a href="/build">Build</a></li>
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<li class="active"><a href="/usage">Usage</a></li>
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<li><a href="/releases">Releases</a></li>
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<li><a href="/source">Source</a></li>
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<li><a href="/donate">Donate</a></li>
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<li><a href="/contact">Contact</a></li>
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</ul>
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</nav>
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<div id="content">
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<h1 id="usage">Usage</h1>
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<p><strong>This page is currently a placeholder and will be filled with lots of content over time.</strong></p>
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<h2 id="auditor">
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Auditor
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<a href="#auditor">¶</a>
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</h2>
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<p>See the <a href="https://attestation.app/tutorial">tutorial page on the site for the attestation sub-project</a>.</p>
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<h2 id="default-connections">
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Default connections
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<a href="#default-connections">¶</a>
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</h2>
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<p>GrapheneOS makes connections to the outside world to test connectivity, detect
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captive portals and download updates. No data varying per user / installation is sent
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in these connections. There aren't analytics / telemetry in GrapheneOS.</p>
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<p>The expected default connections by GrapheneOS (including all base system apps) are the following:</p>
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<ul>
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<li>
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<p>The GrapheneOS Updater app fetches update metadata from
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https://seamlessupdate.app/DEVICE-CHANNEL approximately once every four hours
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when connected to a permitted network for updates.</p>
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<p>Users can control which types of connections the Updater app will use, and
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although it's strongly recommended to always leave it enabled it can be
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disabled.</p>
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</li>
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<li>
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<p>On devices with a Qualcomm baseband (which provides GPS), when location
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functionality is being used,
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<a href="https://en.wikipedia.org/wiki/GPS_signals#Almanac">GPS almanacs</a>
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are downloaded from https://xtrapath1.izatcloud.net/xtra3grc.bin,
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https://xtrapath2.izatcloud.net/xtra3grc.bin or
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https://xtrapath3.izatcloud.net/xtra3grc.bin. GrapheneOS has modified all
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references to these servers to use HTTPS rather than a mix of HTTP and HTTPS.</p>
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</li>
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<li>
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<p>Connectivity checks designed to mimic a web browser user agent are performed
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by using HTTP and HTTPS to fetch standard URLs generating an HTTP 204 status
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code. This is used to detect when internet connectivity is lost on a network,
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which triggers fallback to other available networks if possible. These checks
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are designed to detect and handle captive portals which substitute the
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expected empty 204 response with their own web page. These need use a very
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common domain and URL in order to bypass whitelisting systems only permitting
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access to common domains / URLs so a domain like grapheneos.org would likely
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be inadequate. GrapheneOS leaves these set to the standard four URLs to blend
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into the crowd of billions of other Android devices with and without Google
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Mobile Services performing the same empty GET requests. For privacy reasons,
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it isn't desirable to stand out from the crowd and changing these URLs or even
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disabling the feature will likely reduce your privacy by giving your device a
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more unique fingerprint. GrapheneOS aims to appear like any other common
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mobile device on the network.</p>
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<ul>
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<li>HTTPS: https://www.google.com/generate_204</li>
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<li>HTTP: http://connectivitycheck.gstatic.com/generate_204</li>
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<li>HTTP fallback: http://www.google.com/gen_204</li>
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<li>HTTP other fallback: http://play.googleapis.com/generate_204</li>
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</ul>
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<p>Standard AOSP user agent for the GET request:</p>
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<p>Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.32 Safari/537.36</p>
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<p>No query / data is sent and the response is unused beyond checking the response code.</p>
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</li>
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<li>
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<p>DNS connectivity and functionality tests</p>
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</li>
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<li>
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<p>DNS resolution for other connections</p>
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</li>
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</ul>
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<p>Similar connectivity checks are also performed by the hardened Chromium browser (Vanadium).</p>
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</div>
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<footer>
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<a href="/"><img src="https://grapheneos.org/logo.png" width="512" height="512" alt=""/>GrapheneOS</a>
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<div id="social">
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<a href="https://twitter.com/GrapheneOS">Twitter</a>
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<a href="https://github.com/GrapheneOS">GitHub</a>
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</div>
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</footer>
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</body>
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</html>
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