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    1   /*
    2    * Copyright 2006 University Corporation for Advanced Internet Development, Inc.
    3    *
    4    * Licensed under the Apache License, Version 2.0 (the "License");
    5    * you may not use this file except in compliance with the License.
    6    * You may obtain a copy of the License at
    7    *
    8    * http://www.apache.org/licenses/LICENSE-2.0
    9    *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16
    17  package edu.internet2.middleware.shibboleth.idp.authn;
    18
    19  import java.util.List;
    20
    21  import javax.servlet.http.HttpServletRequest;
    22  import javax.servlet.http.HttpServletResponse;
    23
    24  /**
    25   * Authentication handlers authenticate a user in an implementation specific manner. Some examples of this might be by
    26   * collecting a user name and password and validating it against an LDAP directory, validating a client certificate, or
    27   * validating one-time password.
    28   *
    29   * When a login handler is invoked the user's {@link edu.internet2.middleware.shibboleth.idp.session.Session} is bound
    30   * to the {@link javax.servlet.http.HttpSession} under the attribute with the name
    31   * {@link edu.internet2.middleware.shibboleth.idp.session.Session#HTTP_SESSION_BINDING_ATTRIBUTE}.
    32   *
    33   * After a successful authentication has been completed the handler <strong>MUST</strong> either:
    34   * <ul>
    35   * <li>Bind a {@link javax.security.auth.Subject} to the attribute identified by {@link #SUBJECT_KEY} if one was created
    36   * during the authentication process. The principals, public, and private credentials from this subject will be merged
    37   * with those in the {@link javax.security.auth.Subject} within the
    38   * {@link edu.internet2.middleware.shibboleth.idp.session.Session}.</li>
    39   * <li>Bind a {@link java.security.Principal} for the user to the request attribute identified by {@link #PRINCIPAL_KEY}
    40   * . Such a {@link java.security.Principal} <strong>MUST</strong> implement {@link java.io.Serializable}. This principal
    41   * will be added to the {@link javax.security.auth.Subject} within the
    42   * {@link edu.internet2.middleware.shibboleth.idp.session.Session}.</li>
    43   * <li>Bind a principal name string to the request attribute identified by {@link #PRINCIPAL_NAME_KEY}. In this case the
    44   * {@link AuthenticationEngine} will create a {@link java.security.Principal} object of type
    45   * {@link edu.internet2.middleware.shibboleth.idp.authn.UsernamePrincipal} and add that to the
    46   * {@link javax.security.auth.Subject} within the {@link edu.internet2.middleware.shibboleth.idp.session.Session}.</li>
    47   * </ul>
    48   *
    49   * The handler <strong>MAY</strong> also:
    50   * <ul>
    51   * <li>Bind a URI string, representing the authentication method actually used, to a request attribute identified by
    52   * {@link #AUTHENTICATION_METHOD_KEY}. This may be used if a handler is capable of performing multiple types of
    53   * authentication.</li>
    54   * <li>Bind an error message, if an error occurred during authentication to the request attribute identified by
    55   * {@link LoginHandler#AUTHENTICATION_ERROR_KEY}.</li>
    56   * <li>Bind a {@link AuthenticationException}, if an exception occurred during authentication to the request attribute
    57   * identified by {@link LoginHandler#AUTHENTICATION_EXCEPTION_KEY}.</li>
    58   * </ul>
    59   *
    60   * Finally, the handler must return control to the authentication engine by invoking
    61   * {@link AuthenticationEngine#returnToAuthenticationEngine(HttpServletRequest, HttpServletResponse)}. After which the
    62   * authentication handler must immediately return.
    63   *
    64   * Handlers <strong>MUST NOT</strong> change or add any data to the user's {@link javax.servlet.http.HttpSession} that
    65   * persists past the process of authenticating the user, that is no additional session data may be added and no existing
    66   * session data may be changed when the handler returns control to the authentication engine.
    67   */
    68  public interface LoginHandler {
    69
    70      /** Request attribute to which user's principal should be bound. */
    71      public static final String PRINCIPAL_KEY = "principal";
    72
    73      /** Request attribute to which user's principal name should be bound. */
    74      public static final String PRINCIPAL_NAME_KEY = "principal_name";
    75
    76      /** Request attribute to which user's subject should be bound. */
    77      public static final String SUBJECT_KEY = "subject";
    78
    79      /** Request attribute to which an authentication method URI may be bound. */
    80      public static final String AUTHENTICATION_METHOD_KEY = "authnMethod";
    81
    82      /** Request attribute to which an error message may be bound. */
    83      public static final String AUTHENTICATION_ERROR_KEY = "authnError";
    84
    85      /** Request attribute to which an {@link AuthenticationException} may be bound. */
    86      public static final String AUTHENTICATION_EXCEPTION_KEY = "authnException";
    87
    88      /**
    89       * Gets the list of authentication methods this handler supports.
    90       *
    91       * @return authentication methods this handler supports
    92       */
    93      public List<String> getSupportedAuthenticationMethods();
    94
    95      /**
    96       * Gets the length of time, in milliseconds, after which a user authenticated by this handler should be
    97       * re-authenticated.
    98       *
    99       * @return length of time, in milliseconds, after which a user should be re-authenticated
    100      */
    101     public long getAuthenticationDuration();
    102
    103     /**
    104      * Gets whether this handler supports passive authentication.
    105      *
    106      * @return whether this handler supports passive authentication
    107      */
    108     public boolean supportsPassive();
    109
    110     /**
    111      * Returns if this handler supports the ability to force a user to (re-)authenticate.
    112      *
    113      * @return if this handler can force a user to (re-)authenticate.
    114      */
    115     public boolean supportsForceAuthentication();
    116
    117     /**
    118      * Authenticate the user making the request.
    119      *
    120      * @param httpRequest user request
    121      * @param httpResponse response to user
    122      */
    123     public void login(HttpServletRequest httpRequest, HttpServletResponse httpResponse);
    124 }