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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1"><title>device/fido - chromium/src - Git at Google</title><link rel="stylesheet" type="text/css" href="/+static/base.css"><link rel="stylesheet" type="text/css" href="/+static/doc.css"><link rel="stylesheet" type="text/css" href="/+static/prettify/prettify.css"></head><body class="Site"><header class="Site-header"><div class="Header"><a class="Header-image" href="/"><img src="//www.gstatic.com/images/branding/lockups/2x/lockup_git_color_108x24dp.png" width="108" height="24" alt="Google Git"></a><div class="Header-menu"> <a class="Header-menuItem" href="https://accounts.google.com/AccountChooser?faa=1&service=gerritcodereview&continue=https://chromium.googlesource.com/login/chromium/src/%2B/refs/tags/130.0.6723.141/device/fido">Sign in</a> </div></div></header><div class="Site-content"><div class="Container "><div class="Breadcrumbs"><a class="Breadcrumbs-crumb" href="/?format=HTML">chromium</a> / <a class="Breadcrumbs-crumb" href="/chromium/">chromium</a> / <a class="Breadcrumbs-crumb" href="/chromium/src/">src</a> / <a class="Breadcrumbs-crumb" href="/chromium/src/+/refs/tags/130.0.6723.141">refs/tags/130.0.6723.141</a> / <a class="Breadcrumbs-crumb" href="/chromium/src/+/refs/tags/130.0.6723.141/">.</a> / <a class="Breadcrumbs-crumb" href="/chromium/src/+/refs/tags/130.0.6723.141/device">device</a> / <span class="Breadcrumbs-crumb">fido</span></div><div class="TreeDetail"><div class="u-sha1 u-monospace TreeDetail-sha1">tree: 82e261d3302d52c94b4f3e2dff46523856b1bba7 [<a href="/chromium/src/+log/refs/tags/130.0.6723.141/device/fido">path history</a>] <span>[<a href="/chromium/src/+archive/refs/tags/130.0.6723.141/device/fido.tar.gz">tgz</a>]</span></div><ol class="FileList"><li class="FileList-item FileList-item--gitTree" title="Tree - 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ctap_make_credential_request.h"><a class="FileList-itemLink" href="/chromium/src/+/refs/tags/130.0.6723.141/device/fido/ctap_make_credential_request.h">ctap_make_credential_request.h</a></li><li class="FileList-item FileList-item--regularFile" title="Regular file - ctap_request_unittest.cc"><a class="FileList-itemLink" href="/chromium/src/+/refs/tags/130.0.6723.141/device/fido/ctap_request_unittest.cc">ctap_request_unittest.cc</a></li><li class="FileList-item FileList-item--regularFile" title="Regular file - ctap_response_fuzzer.cc"><a class="FileList-itemLink" href="/chromium/src/+/refs/tags/130.0.6723.141/device/fido/ctap_response_fuzzer.cc">ctap_response_fuzzer.cc</a></li><li class="FileList-item FileList-item--regularFile" title="Regular file - ctap_response_unittest.cc"><a class="FileList-itemLink" href="/chromium/src/+/refs/tags/130.0.6723.141/device/fido/ctap_response_unittest.cc">ctap_response_unittest.cc</a></li><li class="FileList-item FileList-item--regularFile" title="Regular file - 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virtual_fido_device_factory.h"><a class="FileList-itemLink" href="/chromium/src/+/refs/tags/130.0.6723.141/device/fido/virtual_fido_device_factory.h">virtual_fido_device_factory.h</a></li><li class="FileList-item FileList-item--regularFile" title="Regular file - virtual_u2f_device.cc"><a class="FileList-itemLink" href="/chromium/src/+/refs/tags/130.0.6723.141/device/fido/virtual_u2f_device.cc">virtual_u2f_device.cc</a></li><li class="FileList-item FileList-item--regularFile" title="Regular file - virtual_u2f_device.h"><a class="FileList-itemLink" href="/chromium/src/+/refs/tags/130.0.6723.141/device/fido/virtual_u2f_device.h">virtual_u2f_device.h</a></li><li class="FileList-item FileList-item--regularFile" title="Regular file - virtual_u2f_device_unittest.cc"><a class="FileList-itemLink" href="/chromium/src/+/refs/tags/130.0.6723.141/device/fido/virtual_u2f_device_unittest.cc">virtual_u2f_device_unittest.cc</a></li></ol><div class="InlineReadme"><div class="InlineReadme-path">device/fido/README.md</div><div class="doc"><h1><a class="h" name="Security-Keys" href="#Security-Keys"><span></span></a><a class="h" name="security-keys" href="#security-keys"><span></span></a>Security Keys</h1><p>Security keys are physical devices that often connect via USB and have a button. They can generate public keys and sign with them to authenticate a user and are most often used as a second factor for security.</p><p>Websites interact with them via the <a href="https://www.w3.org/TR/webauthn/">W3C Webauthn API</a>, part of <a href="https://www.w3.org/TR/credential-management-1/">CredMan</a>.</p><p>Several different types of security keys are supported. Older security keys implement the <a href="https://fidoalliance.org/specs/fido-u2f-v1.2-ps-20170411/fido-u2f-raw-message-formats-v1.2-ps-20170411.html">U2F protocol</a> while more modern ones implement <a href="https://fidoalliance.org/specs/fido-v2.0-ps-20190130/fido-client-to-authenticator-protocol-v2.0-ps-20190130.html">CTAP2</a>. These devices can work over USB, Bluetooth Low Energy (BLE), or NFC (not supported). Additionally Chromium contains support for using Touch ID on macOS as a security key as well support for forwarding requests to the native libraries on modern versions of Windows.</p><h2><a class="h" name="Life-of-a-request" href="#Life-of-a-request"><span></span></a><a class="h" name="life-of-a-request" href="#life-of-a-request"><span></span></a>Life of a request</h2><p>This section provides a coarse roadmap for understanding the code involved in security key support by highlighting the path that a login request might take.</p><p>Firstly, the CredMan <code class="code">get</code> call ends up in <a href="https://cs.chromium.org/search/?q=symbol:CredentialsContainer::get+exact:yes&det=matsel&sq=package:chromium&type=cs"><code class="code">CredentialsContainer::get</code></a>. CredMan supports several types of credentials but the code dealing with <code class="code">publicKey</code> relates to security key support.</p><p>The request is packaged into a Mojo call defined in <a href="/chromium/src/+/refs/tags/130.0.6723.141/third_party/blink/public/mojom/webauthn/authenticator.mojom">authenticator.mojom</a>. On Android, that Mojo request is handled by Android-specific code and is forwarded to support libraries in Google Play Services. Otherwise the Mojo interface will be bound to <a href="/chromium/src/+/refs/tags/130.0.6723.141/content/public/browser/authenticator_common.h"><code class="code">AuthenticatorCommon</code></a>; specifically it'll call <a href="https://cs.chromium.org/search/?q=symbol:AuthenticatorCommon::GetAssertion+exact:yes&sq=package:chromium"><code class="code">AuthenticatorCommon::GetAssertion</code></a>.</p><p>AuthenticatorCommon is part of Chromium‘s <a href="https://www.chromium.org/developers/content-module">content layer</a> and so <a href="https://cs.chromium.org/search/?q=symbol:GetWebAuthenticationRequestDelegate+exact:yes&sq=package:chromium">calls into the embedder</a> to get a <a href="https://cs.chromium.org/search/?q=symbol:AuthenticatorRequestClientDelegate+exact:yes">delegate object</a> that allows it to perform actions like showing UI. It also triggers the lower-level code to start the process of finding an authenticator to handle the request. For an assertion request it’ll create a <a href="https://cs.chromium.org/search/?q=symbol:GetAssertionRequestHandler+exact:yes"><code class="code">GetAssertionRequestHandler</code></a> from this directory.</p><p>The <code class="code">Handler</code> classes manage a specific user action and their first job is to <a href="https://cs.chromium.org/search/?q=symbol:FidoRequestHandlerBase::InitDiscoveries+exact:yes">initiate discovery</a> of possible security keys. The discovery process will find candidate USB, BLE, Touch ID, etc devices, each of which will be fed into <a href="https://cs.chromium.org/search/?q=symbol:GetAssertionRequestHandler::DispatchRequest+exact:yes"><code class="code">DispatchRequest</code></a>. Different actions may be taken depending on features of the discovered authenticator. For example, an authenticator which cannot handle the request may be asked to wait for a touch so that the user can still select it, even though it'll cause the request to fail. These per-authenticator operations will be dispatched via the abstract <a href="https://cs.chromium.org/search/?q=symbol:FidoAuthenticator+exact:yes"><code class="code">FidoAuthenticator</code></a> interface.</p><p>If a per-authenticator operation is complex and requires several steps it will be handled by a “task”. In this example, a <a href="https://cs.chromium.org/search/?q=symbol:device::GetAssertionTask+exact:yes"><code class="code">GetAssertionTask</code></a> will likely be created by a <a href="https://cs.chromium.org/search/?q=symbol:device::FidoDeviceAuthenticator+exact:yes"><code class="code">FidoDeviceAuthenticator</code></a>, the implementation of <code class="code">FidoAuthenticator</code> used by physical devices.</p><p>The assertion task knows how to sequence a series of U2F or CTAP2 operations to implement an assertion request. In the case of U2F, there will be another layer of state machines in, e.g., <a href="https://cs.chromium.org/search/?q=symbol:device::U2FSignOperation+exact:yes"><code class="code">U2fSignOperation</code></a> because U2F has a historical authenticator model.</p><p>If interaction with UI is required, for example to prompt for a PIN, the handler will make calls via the <a href="https://cs.chromium.org/search/?q=symbol:device::FidoRequestHandlerBase::Observer+exact:yes"><code class="code">Observer</code></a> interface, which is implemented by the embedder's UI objects that were created by <code class="code">AuthenticatorCommon</code>.</p><h2><a class="h" name="Settings" href="#Settings"><span></span></a><a class="h" name="settings" href="#settings"><span></span></a>Settings</h2><p>It's also possible for security key operations to be triggered by actions in the Settings UI: there are several security key actions that can be taken on <code class="code">chrome://settings/securityKeys</code>. In this case, calls from the Javascript that implements the Settings UI end up in <a href="https://cs.chromium.org/search/?q=symbol:settings::SecurityKeysHandler+exact:yes"><code class="code">SecurityKeysHandler</code></a>, which then operates in the same way as <code class="code">AuthenticatorCommon</code>, albeit without creating any native UI.</p><h2><a class="h" name="Fuzzers" href="#Fuzzers"><span></span></a><a class="h" name="fuzzers" href="#fuzzers"><span></span></a>Fuzzers</h2><p><a href="/chromium/src/+/refs/tags/130.0.6723.141/testing/libfuzzer/README.md">libFuzzer</a> tests are in <code class="code">*_fuzzer.cc</code> files. They test for bad input from devices, e.g. when parsing responses to register or sign operations.</p></div></div></div></div> </div> <footer class="Site-footer"><div class="Footer"><span class="Footer-poweredBy">Powered by <a href="https://gerrit.googlesource.com/gitiles/">Gitiles</a>| <a href="https://policies.google.com/privacy">Privacy</a>| <a href="https://policies.google.com/terms">Terms</a></span><span class="Footer-formats"><a class="u-monospace Footer-formatsItem" href="?format=TEXT">txt</a> <a class="u-monospace Footer-formatsItem" href="?format=JSON">json</a></span></div></footer></body></html>