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| Rev | Author | Line No. | Line |
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| 86 | rm5248 | 1 | /* |
| 2 | * Licensed to the Apache Software Foundation (ASF) under one |
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| 3 | * or more contributor license agreements. See the NOTICE file |
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| 4 | * distributed with this work for additional information |
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| 5 | * regarding copyright ownership. The ASF licenses this file |
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| 6 | * to you under the Apache License, Version 2.0 (the |
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| 7 | * "License"); you may not use this file except in compliance |
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| 8 | * with the License. You may obtain a copy of the License at |
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| 9 | * |
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| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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| 11 | * |
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| 12 | * Unless required by applicable law or agreed to in writing, |
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| 13 | * software distributed under the License is distributed on an |
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| 14 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
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| 15 | * KIND, either express or implied. See the License for the |
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| 16 | * specific language governing permissions and limitations |
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| 17 | * under the License. |
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| 18 | */ |
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| 19 | package org.apache.sshd.server.auth.gss; |
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| 20 | |||
| 21 | import java.security.PrivilegedActionException; |
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| 22 | import java.security.PrivilegedExceptionAction; |
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| 23 | import java.util.HashMap; |
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| 24 | import java.util.Map; |
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| 25 | |||
| 26 | import javax.security.auth.Subject; |
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| 27 | import javax.security.auth.login.AppConfigurationEntry; |
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| 28 | import javax.security.auth.login.Configuration; |
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| 29 | import javax.security.auth.login.LoginContext; |
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| 30 | import javax.security.auth.login.LoginException; |
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| 31 | |||
| 32 | import org.ietf.jgss.GSSCredential; |
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| 33 | import org.ietf.jgss.GSSException; |
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| 34 | import org.ietf.jgss.GSSManager; |
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| 35 | |||
| 36 | /** |
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| 37 | * Simple helper class which gets GSS credential using a fixed Krb5 login configuration. May need generalizing to deal |
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| 38 | * with non-Sun JREs. |
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| 39 | */ |
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| 40 | |||
| 41 | public class CredentialHelper { |
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| 42 | |||
| 43 | public static GSSCredential creds(GSSManager mgr, String spn, String keytab) throws LoginException, GSSException { |
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| 44 | LoginContext lc = new LoginContext("x", null, null, new FixedLoginConfiguration(spn, keytab)); |
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| 45 | |||
| 46 | lc.login(); |
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| 47 | |||
| 48 | try { |
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| 49 | return (GSSCredential) Subject.doAs(lc.getSubject(), new G(mgr)); |
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| 50 | } catch (PrivilegedActionException e) { |
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| 51 | throw (GSSException) e.getCause(); |
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| 52 | } |
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| 53 | } |
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| 54 | |||
| 55 | /** |
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| 56 | * A login configuration which is defined from code. |
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| 57 | * |
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| 58 | * @author Richard Evans |
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| 59 | */ |
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| 60 | |||
| 61 | private static class FixedLoginConfiguration extends Configuration { |
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| 62 | |||
| 63 | private AppConfigurationEntry entry; |
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| 64 | |||
| 65 | /** |
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| 66 | * Constructor. |
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| 67 | */ |
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| 68 | |||
| 69 | private FixedLoginConfiguration(String spn, String keytab) { |
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| 70 | Map<String, String> parms = new HashMap<String, String>(); |
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| 71 | |||
| 72 | parms.put("isInitiator", "false"); |
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| 73 | parms.put("principal", spn); |
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| 74 | parms.put("useKeyTab", "true"); |
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| 75 | parms.put("storeKey", "true"); |
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| 76 | |||
| 77 | if (keytab != null) { |
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| 78 | parms.put("keyTab", keytab); |
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| 79 | } |
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| 80 | |||
| 81 | entry = new AppConfigurationEntry("com.sun.security.auth.module.Krb5LoginModule", AppConfigurationEntry.LoginModuleControlFlag.REQUIRED, parms); |
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| 82 | } |
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| 83 | |||
| 84 | /** |
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| 85 | * Get the configuration entries for a name. |
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| 86 | * |
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| 87 | * @param name The name |
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| 88 | * @return The entries, or <code>null</code> if the name is not known |
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| 89 | */ |
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| 90 | |||
| 91 | public AppConfigurationEntry[] getAppConfigurationEntry(String name) { |
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| 92 | return new AppConfigurationEntry[]{entry}; |
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| 93 | } |
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| 94 | |||
| 95 | /** |
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| 96 | * Refresh the configuration. Nothing to do here. |
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| 97 | */ |
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| 98 | |||
| 99 | public void refresh() { |
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| 100 | } |
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| 101 | } |
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| 102 | |||
| 103 | /** |
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| 104 | * Privileged action which runs as the subject to get the credentials. |
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| 105 | */ |
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| 106 | |||
| 107 | private static final class G implements PrivilegedExceptionAction<GSSCredential> { |
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| 108 | |||
| 109 | private GSSManager mgr; |
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| 110 | |||
| 111 | /** |
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| 112 | * @param mgr The existing GSS manager |
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| 113 | */ |
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| 114 | |||
| 115 | private G(GSSManager mgr) { |
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| 116 | this.mgr = mgr; |
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| 117 | } |
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| 118 | |||
| 119 | /** |
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| 120 | * Do the action. |
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| 121 | * |
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| 122 | * @return The new credentials |
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| 123 | * @throws GSSException If an error occurred |
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| 124 | */ |
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| 125 | |||
| 126 | public GSSCredential run() throws GSSException { |
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| 127 | return mgr.createCredential(null, GSSCredential.INDEFINITE_LIFETIME, UserAuthGSS.KRB5_MECH, GSSCredential.ACCEPT_ONLY); |
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| 128 | } |
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| 129 | } |
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| 130 | } |