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/*
* Copyright 2012-2016 UnboundID Corp.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License (GPLv2 only)
* or the terms of the GNU Lesser General Public License (LGPLv2.1 only)
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see .
*/
package com.unboundid.scim.sdk;
import java.security.GeneralSecurityException;
/**
* This class defines an API that must be implemented by extensions which will
* handle incoming SCIM requests with OAuth 2.0 bearer token authentication.
* The OAuthTokenHandler is responsible for decoding the bearer token and
* checking it for authenticity and validity.
*
* OAuth provides a method for clients to access a protected resource on
* behalf of a resource owner. In the general case, before a client can
* access a protected resource, it must first obtain an authorization
* grant from the resource owner and then exchange the authorization
* grant for an access token. The access token represents the grant's
* scope, duration, and other attributes specified by the authorization
* grant. The client accesses the protected resource by presenting the
* access token to the resource server (i.e. the Identity Data Store or Identity
* Proxy with the SCIM HTTP Servlet enabled).
*
* The access token provides an abstraction, replacing different
* authorization constructs (e.g., username and password, assertion) for
* a single token understood by the resource server. This abstraction
* enables issuing access tokens valid for a short time period, as well
* as removing the resource server's need to understand a wide range of
* authentication schemes. See "OAuth 2.0 Authorization Framework: Bearer
* Token Usage" (RFC 6750) for the full
* specification and details.
*
* TLS security is required to use OAuth 2.0 bearer tokens, as specified in
* RFC 6750. A bearer token may be used by any party
* in possession of that token (the "bearer"), and thus needs to be protected
* when transmitted across the network. Implementations of this API should take
* special care to verify that the token came from a trusted source (using a
* secret key or some other signing mechanism to prove that the token is
* authentic). Please read "OAuth 2.0 Threat Model and Security Considerations"
* (RFC 6819) for a comprehensive list of
* security threats to consider when working with OAuth bearer tokens.
*
* The OAuthTokenHandler is also responsible for extracting an authorization DN
* from the bearer token (or otherwise providing one), which will be used to
* apply access controls before returning the protected resource. There are also
* methods to extract the expiration date of the token as well as verify that
* the intended audience is this server (to deal with token redirect).
*
* The order these methods are called by the SCIM HTTP Servlet Extension is as
* follows:
*
* - decodeOAuthToken()
* - isTokenAuthentic()
* - isTokenForThisServer()
* - isTokenExpired()
* - validateToken()
* - getAuthzDN()
*
* If any of the methods fail or return an error result, the server will return
* an appropriate "unauthorized" response to the client.
*/
public interface OAuthTokenHandler
{
/**
* Creates an {@link OAuthToken} instance from the incoming token value.
*
* Implementers may choose to return a subclass of {@link OAuthToken} in
* order to provide convenience methods for interacting with the token. This
* can be helpful because the returned {@link OAuthToken} is passed to all of
* the other methods in this class.
*
* @param rawTokenValue the b64token token value. Note that b64token is just
* an ABNF syntax definition and does not imply any
* base64-encoding of the token value.
* @return a {@link OAuthToken} instance. This must not be {@code null}.
* @throws GeneralSecurityException if there is an error decoding the token
*/
OAuthToken decodeOAuthToken(final String rawTokenValue)
throws GeneralSecurityException;
/**
* Determines whether the given token is expired.
*
* @param token the OAuth 2.0 bearer token.
* @return {@code true} if the token is already expired, {@code false} if not.
* @throws GeneralSecurityException if there is an error determining the
* token's expiration date
*/
boolean isTokenExpired(final OAuthToken token)
throws GeneralSecurityException;
/**
* Determines whether the incoming token is authentic (i.e. that it came from
* a trusted authorization server and not an attacker). Implementers are
* encouraged to use signed tokens and use this method to verify the
* signature, but other methods such as symmetric key encryption (using a
* shared secret) can be used as well.
*
* @param token the OAuth 2.0 bearer token.
* @return {@code true} if the bearer token can be verified as authentic and
* originating from a trusted source, {@code false} if not.
* @throws GeneralSecurityException if there is an error determining whether
* the token is authentic
*/
boolean isTokenAuthentic(final OAuthToken token)
throws GeneralSecurityException;
/**
* Determines whether the incoming token is targeted for this server. This
* allows the implementation to reject the token early in the validation
* process if it can see that the intended recipient was not this server.
*
* @param token the OAuth 2.0 bearer token.
* @return {@code true} if the bearer token identifies this server as the
* intended recipient, {@code false} if not.
* @throws GeneralSecurityException if there is an error determining whether
* the token is for this server
*/
boolean isTokenForThisServer(final OAuthToken token)
throws GeneralSecurityException;
/**
* Determines whether the incoming token is valid for the given request. This
* method should verify that the token is legitimate and grants access to the
* requested resource specified in the {@link SCIMRequest}. This typically
* involves checking the token scope and any other attributes granted by the
* authorization grant. Implementations may need to call back to the
* authorization server to verify that the token is still valid and has not
* been revoked.
*
* @param token the OAuth 2.0 bearer token.
* @param scimRequest the {@link SCIMRequest} that we are validating.
* @return an {@link OAuthTokenStatus} object which indicates whether the
* bearer token is valid and grants access to the target resource.
* This must not be {@code null}.
* @throws GeneralSecurityException if there is an error determining whether
* the token is valid
*/
OAuthTokenStatus validateToken(final OAuthToken token,
final SCIMRequest scimRequest)
throws GeneralSecurityException;
/**
* Extracts the DN of the authorization entry (for which to apply access
* controls) from the incoming token.
*
* This may require performing an LDAP search in order to find the DN that
* matches a certain attribute value contained in the token.
*
* @param token the OAuth 2.0 bearer token.
* @return the authorization DN to use. This must not return {@code null}.
* @throws GeneralSecurityException if there is an error determining the
* authorization user DN
*/
String getAuthzDN(final OAuthToken token) throws GeneralSecurityException;
}