One Password Chrome



Web browsers – Chrome, Firefox, Internet Explorer, and others – all have integrated password managers. Each browser’s built-in password manager can’t compete with dedicated password managers. For one thing, Chrome and Internet Explorer store your passwords on your computer in an unencrypted form. Welcome to your Password Manager. Manage your saved passwords in Android or Chrome. They’re securely stored in your Google Account and available across all your devices.

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If you employ multiple domains that share the same account management backend, you can now also associate them with one another to enable users to save credentials once and have the Chrome password manager suggest them to any of the affiliated websites.

Chrome's password manager already autofills credentials for sites with saved credentials, as well as in the following two cases:

  1. When two sites are in the same-site relationship, Chrome will show autofill credentials for the other site if there's at least one credential saved on one site. For example, because www.example.com and m.example.com are the same-site, Chrome can share saved credentials between the two sites and suggest the saved password to another.
  2. When a developer associates an Android app with a site that uses the same credentials, Chrome can suggest Android credentials on that site. Apps are associated with sites using Digital Asset Links (DALs).

You can now also associate websites in a cross-site relationship to enable users to save their credentials once and have the password manager suggest them to any of the affiliated websites.

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If you employ multiple domains that share the same account management backend (such as https://www.example.com and https://www.example.co.uk), starting in version 91, you can enable Chrome to suggest passwords saved to domains associated with Digital Asset Links.

There's a similar potential web platform feature called First-Party Sets. However, while it allows for embeds from cross-site to be treated as the same party when the top-level domain is owned by the same organization, there's no plan to have any effect on handling passwords. The Digital Asset Links is Google's technology that can be used for passwords, but it has no effect on handling cookies.

To make a DAL association, developers need to put a JSON file that follows the DAL syntax at /.well-known/assetlinks.json on the respective domains.

Prerequisites #

  1. Use Chrome 91 or later.
  2. Enable the flag at chrome://flags#filling-across-affiliated-websites.
  3. Make sure 'Offer to save passwords' is turned on in chrome://settings/passwords.
  4. Make sure your website's sign-in domain is available through HTTPS.

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Associate your two websites #

  1. To declare that the website, for example https://www.example.com,can share credentials with https://www.example.co.uk, create a file named assetlinks.json with the following content:


    The relation field is an array of one or more strings that describe the relationship between the sites. For sites to share sign-in credentials, specify the string delegate_permission/common.get_login_creds.
    The target field is an object that specifies the asset the declaration applies to. The following fields identify a website:


    namespaceMust be web for websites.
    siteThe website's URL, in the format https://domain[:optional_port]; for example, https://www.example.com.

    See the Digital Asset Links reference for details.

  2. Host the Digital Asset Links JSON file at the following location on the sign-in domain: https://domain[:optional_port]/.well-known/assetlinks.json.


    In this example, the domain is www.example.com, so the JSON file should be hosted at https://www.example.com/.well-known/assetlinks.json.


    The MIME type for the Digital Asset Links file needs to be JSON. Make sure the server sends a Content-Type: application/json header in the response.

  3. To declare the association in both websites, host the assetlinks.jsonat https://www.example.co.uk/.well-known/assetlinks.json as well:


  4. Ensure that your host permits Google to retrieve your Digital Asset Links file. If you have a robots.txt file, it must allow the Googlebot agent to retrieve /.well-known/assetlinks.json. Most sites can simply allow any automated agent to retrieve files in the /.well-known/ path so that other services can access the metadata in those files:


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Be aware that once you set up a DAL file, it may take a while for Googlebot to fetch the resource and recognize the association.

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Associate multiple websites with one another #

You can associate multiple websites with one another by specifying each one in the Digital Asset Links file. For example, to associate the example.com, example.co.uk,andexample.co.jp, specify all of those websites in the assetlinks.json JSON file and host it on each website at https://EXAMPLE_DOMAIN_NAME/.well-known/assetlinks.json.

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You can use include statements if you need to issue statements from different sites to the same set of targets. For example, a website may be available on many different per-country top level domains, and you want to share credentials between all of them. Using include statements, you can set up pointers from many different sites to one central location, which defines statements for all of them.





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