Add specification for using oauth with the token server
Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)master
Derek McGowan
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@ -8,5 +8,6 @@ keywords = ["registry, on-prem, images, tags, repository, distribution, authenti
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# Docker Registry v2 authentication
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See the [Token Authentication Specification](token.md) and
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[Token Authentication Implementation](jwt.md) for more information.
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See the [Token Authentication Specification](token.md),
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[Token Authentication Implementation](jwt.md), and
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[OAuth2 Token Authentication](oauth.md) for more information.
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@ -0,0 +1,122 @@
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<!--[metadata]>
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+++
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title = "Oauth2 Token Authentication"
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description = "Specifies the Docker Registry v2 authentication"
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keywords = ["registry, on-prem, images, tags, repository, distribution, oauth2, advanced"]
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[menu.main]
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parent="smn_registry_ref"
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+++
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<![end-metadata]-->
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# Docker Registry v2 authentication using OAuth2
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This document describes support for the OAuth2 protocol within the authorization
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server. [RFC6749](https://tools.ietf.org/html/rfc6749) should be used as a
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reference for the protocol and HTTP endpoints described here.
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## Refresh token format
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The format of the refresh token is completely opaque to the client and should be
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determined by the authorization server. The authorization should ensure the
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token is sufficiently long and is responsible for storing any information about
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long-lived tokens which may be needed for revoking. Any information stored
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inside the token will not be extracted and presented by clients.
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## Getting a token
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POST /token
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#### Headers
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Authorization headers
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Content-Type: application/x-www-form-urlencoded
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#### Post parameters
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<dl>
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<dt>
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<code>grant_type</code>
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</dt>
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<dd>
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(REQUIRED) Type of grant used to get token. When getting a refresh token
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using credentials this type should be set to "password" and have the
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accompanying basic auth header. Type "authorization_code" is reserved
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for future use for authenticating to an authorization server without
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having to send credentials directly from the client. When requesting an
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access token with a refresh token this should be set to "refresh_token".
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</dd>
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<dt>
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<code>service</code>
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</dt>
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<dd>
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(REQUIRED) The name of the service which hosts the resource to get
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access for. Refresh tokens will only be good for getting tokens for
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this service.
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</dd>
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<dt>
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<code>client</code>
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</dt>
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<dd>
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(REQUIRED) The name of the client which is getting accessed. Intended to be human
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readable for key auditing.
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</dd>
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<dt>
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<code>access_type</code>
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</dt>
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<dd>
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(OPTIONAL) Access which is being requested. If "offline" is provided then a refresh
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token will be returned. Otherwise only a short lived access token will
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be returned. If the grant type is "refresh_token" this will only return
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the same refresh token and not a new one.
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</dd>
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<dt>
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<code>scope</code>
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</dt>
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<dd>
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(OPTIONAL) The resource in question, formatted as one of the space-delimited
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entries from the <code>scope</code> parameters from the <code>WWW-Authenticate</code> header
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shown above. This query parameter should be specified multiple times if
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there is more than one <code>scope</code> entry from the <code>WWW-Authenticate</code>
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header. The above example would be specified as:
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<code>scope=repository:samalba/my-app:push</code>. When requesting a refresh
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token the scopes may be empty since the refresh token will not be limited by
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this scope, only the provided short lived access token.
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</dd>
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<dt>
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<code>refresh_token</code>
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</dt>
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<dd>
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(OPTIONAL) The refresh token to use for authentication when grant type "refresh_token" is used.
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</dd>
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</dl>
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#### Example getting refresh token
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```
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POST /token HTTP/1.1
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Host: auth.docker.io
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Authorization: ...
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Content-Type: application/x-www-form-urlencoded
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grant_type=password&service=hub.docker.io&client=dockerengine&access_type=offline
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HTTP/1.1 200 OK
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Content-Type: application/json
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{"refresh_token":"xT2s5VFNrbzZTMVExUmpwWVRsSklPbFJMTmtnNlMxUkxOanBCUVV0VU1Ga3d","access_token":"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.eyJhY2Nlc3MiOlt7InR5cGUiOiJyZXBvc2l0b3J5IiwibmFtZSI6ImRtY2dvd2FuL2hlbGxvLXdvcmxkIiwiYWN0aW9ucyI6WyJwdWxsIl19XSwiYXVkIjoicmVnaXN0cnkuZG9ja2VyLmlvIiwiZXhwIjoxNDU0NDM4Njc1LCJpYXQiOjE0NTQ0MzgzNzUsImlzcyI6ImF1dGguZG9ja2VyLmlvIiwianRpIjoiZXFrVmVsWWJtbW5KSDctNW53SEkiLCJuYmYiOjE0NTQ0MzgzNzUsInN1YiI6ImRtY2dvd2FuIn0"}
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````
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#### Example refreshing an Access Token
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````
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POST /token HTTP/1.1
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Host: auth.docker.io
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Content-Type: application/x-www-form-urlencoded
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grant_type=refresh_token&refresh_token=kas9Da81Dfa8&service=registry-1.docker.io&client=dockerengine&scope=repository:samalba/my-app:pull,push
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HTTP/1.1 200 OK
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Content-Type: application/json
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{"access_token":"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.eyJhY2Nlc3MiOlt7InR5cGUiOiJyZXBvc2l0b3J5IiwibmFtZSI6ImRtY2dvd2FuL2hlbGxvLXdvcmxkIiwiYWN0aW9ucyI6WyJwdWxsIl19XSwiYXVkIjoicmVnaXN0cnkuZG9ja2VyLmlvIiwiZXhwIjoxNDU0NDM4Njc1LCJpYXQiOjE0NTQ0MzgzNzUsImlzcyI6ImF1dGguZG9ja2VyLmlvIiwianRpIjoiZXFrVmVsWWJtbW5KSDctNW53SEkiLCJuYmYiOjE0NTQ0MzgzNzUsInN1YiI6ImRtY2dvd2FuIn0"}
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````
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@ -91,6 +91,8 @@ challenge, the client will need to make a `GET` request to the URL
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## Requesting a Token
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Defines getting a bearer and refresh token using the token endpoint.
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#### Query Parameters
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<dl>
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@ -100,6 +102,15 @@ challenge, the client will need to make a `GET` request to the URL
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<dd>
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The name of the service which hosts the resource.
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</dd>
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<dt>
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<code>offline_token</code>
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</dt>
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<dd>
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Whether to return a refresh token along with the bearer token. A refresh
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token is capable of getting additional bearer tokens for the same
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subject with different scopes. The refresh token does not have an
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expiration and should be considered completely opaque to the client.
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</dd>
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<dt>
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<code>scope</code>
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</dt>
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@ -109,7 +120,9 @@ challenge, the client will need to make a `GET` request to the URL
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shown above. This query parameter should be specified multiple times if
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there is more than one <code>scope</code> entry from the <code>WWW-Authenticate</code>
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header. The above example would be specified as:
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<code>scope=repository:samalba/my-app:push</code>.
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<code>scope=repository:samalba/my-app:push</code>. The scope field may
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be empty to request a refresh token without providing any resource
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permissions to the returned bearer token.
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</dd>
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</dl>
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@ -150,6 +163,16 @@ challenge, the client will need to make a `GET` request to the URL
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standard time at which a given token was issued. If <code>issued_at</code> is omitted, the
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expiration is from when the token exchange completed.
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</dd>
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<dt>
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<code>refresh_token</code>
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</dt>
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<dd>
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(Optional) Token which can be used to get additional access tokens for
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the same subject with different scopes. This token should be kept secure
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by the client and only sent to the authorization server which issues
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bearer tokens. This field will only be set when `offline_token=true` is
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provided in the request.
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</dd>
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</dl>
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#### Example
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@ -161,11 +184,12 @@ https://auth.docker.io/token?service=registry.docker.io&scope=repository:samalba
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```
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The token server should first attempt to authenticate the client using any
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authentication credentials provided with the request. As of Docker 1.8, the
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registry client in the Docker Engine only supports Basic Authentication to
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these token servers. If an attempt to authenticate to the token server fails,
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the token server should return a `401 Unauthorized` response indicating that
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the provided credentials are invalid.
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authentication credentials provided with the request. From Docker 1.11 the
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Docker engine supports both Basic Authentication and [OAuth2](oauth.md) for
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getting tokens. Docker 1.10 and before, the registry client in the Docker Engine
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only supports Basic Authentication. If an attempt to authenticate to the token
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server fails, the token server should return a `401 Unauthorized` response
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indicating that the provided credentials are invalid.
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Whether the token server requires authentication is up to the policy of that
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access control provider. Some requests may require authentication to determine
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