J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Portions Copyright 2001-2004 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | /* |
| 27 | * |
| 28 | * (C) Copyright IBM Corp. 1999 All Rights Reserved. |
| 29 | * Copyright 1997 The Open Group Research Institute. All rights reserved. |
| 30 | */ |
| 31 | |
| 32 | package sun.security.krb5.internal; |
| 33 | |
| 34 | import sun.security.krb5.*; |
| 35 | import sun.security.krb5.internal.ccache.CredentialsCache; |
| 36 | import java.util.StringTokenizer; |
| 37 | import sun.security.krb5.internal.ktab.*; |
| 38 | import java.io.File; |
| 39 | import java.io.IOException; |
| 40 | import java.util.Date; |
| 41 | import java.util.Vector; |
| 42 | import java.io.BufferedReader; |
| 43 | import java.io.InputStreamReader; |
| 44 | import java.io.UnsupportedEncodingException; |
| 45 | import java.net.InetAddress; |
| 46 | |
| 47 | /** |
| 48 | * This class is a utility that contains much of the TGS-Exchange |
| 49 | * protocol. It is used by ../Credentials.java for service ticket |
| 50 | * acquisition in both the normal and the x-realm case. |
| 51 | */ |
| 52 | public class CredentialsUtil { |
| 53 | |
| 54 | private static boolean DEBUG = sun.security.krb5.internal.Krb5.DEBUG; |
| 55 | |
| 56 | /** |
| 57 | * Acquires credentials for a specified service using initial credential. Wh |
| 58 | en the service has a different realm |
| 59 | * from the initial credential, we do cross-realm authentication - first, we |
| 60 | use the current credential to get |
| 61 | * a cross-realm credential from the local KDC, then use that cross-realm cr |
| 62 | edential to request service credential |
| 63 | * from the foreigh KDC. |
| 64 | * |
| 65 | * @param service the name of service principal using format components@real |
| 66 | m |
| 67 | * @param ccreds client's initial credential. |
| 68 | * @exception Exception general exception will be thrown when any error occu |
| 69 | rs. |
| 70 | * @return a <code>Credentials</code> object. |
| 71 | */ |
| 72 | public static Credentials acquireServiceCreds( |
| 73 | String service, Credentials ccreds) |
| 74 | throws KrbException, IOException { |
| 75 | ServiceName sname = new ServiceName(service); |
| 76 | String serviceRealm = sname.getRealmString(); |
| 77 | String localRealm = ccreds.getClient().getRealmString(); |
| 78 | String defaultRealm = Config.getInstance().getDefaultRealm(); |
| 79 | |
| 80 | if (localRealm == null) { |
| 81 | PrincipalName temp = null; |
| 82 | if ((temp = ccreds.getServer()) != null) |
| 83 | localRealm = temp.getRealmString(); |
| 84 | } |
| 85 | if (localRealm == null) { |
| 86 | localRealm = defaultRealm; |
| 87 | } |
| 88 | if (serviceRealm == null) { |
| 89 | serviceRealm = localRealm; |
| 90 | sname.setRealm(serviceRealm); |
| 91 | } |
| 92 | |
| 93 | /* |
| 94 | if (!localRealm.equalsIgnoreCase(serviceRealm)) { //do cross-realm auth entication |
| 95 | if (DEBUG) { |
| 96 | System.out.println(">>>DEBUG: Credentails request cross realm ticket for " + "krbtgt/" + serviceRealm + "@" + localRealm); |
| 97 | } |
| 98 | Credentials crossCreds = serviceCreds(new ServiceName("krbtgt/" + serviceRealm + "@" + localRealm), ccreds); |
| 99 | if (DEBUG) { |
| 100 | printDebug(crossCreds); |
| 101 | } |
| 102 | Credentials result = serviceCreds(sname, crossCreds); |
| 103 | if (DEBUG) { |
| 104 | printDebug(result); |
| 105 | } |
| 106 | return result; |
| 107 | } |
| 108 | else return serviceCreds(sname, ccreds); |
| 109 | */ |
| 110 | |
| 111 | if (localRealm.equals(serviceRealm)) |
| 112 | { |
| 113 | if (DEBUG) |
| 114 | System.out.println(">>> Credentials acquireServiceCreds: same realm"); |
| 115 | return serviceCreds(sname, ccreds); |
| 116 | } |
| 117 | |
| 118 | // Get a list of realms to traverse |
| 119 | String[] realms = Realm.getRealmsList(localRealm, serviceRealm); |
| 120 | |
| 121 | if (realms == null || realms.length == 0) |
| 122 | { |
| 123 | if (DEBUG) |
| 124 | System.out.println(">>> Credentials acquireServiceCreds: no realms list"); |
| 125 | return null; |
| 126 | } |
| 127 | |
| 128 | int i = 0, k = 0; |
| 129 | Credentials cTgt = null, newTgt = null, theTgt = null; |
| 130 | ServiceName tempService = null; |
| 131 | String realm = null, newTgtRealm = null, theTgtRealm = null; |
| 132 | |
| 133 | for (cTgt = ccreds, i = 0; i < realms.length;) |
| 134 | { |
| 135 | tempService = new ServiceName(PrincipalName.TGS_DEFAULT_SRV_NAME, |
| 136 | serviceRealm, realms[i]); |
| 137 | |
| 138 | if (DEBUG) |
| 139 | { |
| 140 | System.out.println(">>> Credentials acquireServiceCreds: main loop: [" + i +"] tempService=" + tempService); |
| 141 | } |
| 142 | |
| 143 | try { |
| 144 | newTgt = serviceCreds(tempService, cTgt); |
| 145 | } catch (Exception exc) { |
| 146 | newTgt = null; |
| 147 | } |
| 148 | |
| 149 | if (newTgt == null) |
| 150 | { |
| 151 | if (DEBUG) |
| 152 | { |
| 153 | System.out.println(">>> Credentials acquireServiceCreds: no tgt; searching backwards"); |
| 154 | } |
| 155 | |
| 156 | /* |
| 157 | * No tgt found. Try to get one for a |
| 158 | * realm as close to the target as possible. |
| 159 | * That means traversing the realms list backwards. |
| 160 | */ |
| 161 | |
| 162 | for (newTgt = null, k = realms.length - 1; |
| 163 | newTgt == null && k > i; k--) |
| 164 | { |
| 165 | |
| 166 | tempService = new ServiceName( |
| 167 | PrincipalName.TGS_DEFAULT_SRV_NAME, |
| 168 | realms[k], realms[i]); |
| 169 | if (DEBUG) |
| 170 | { |
| 171 | System.out.println(">>> Credentials acquireServiceCreds: inner loop: [" + k +"] tempService=" + tempService); |
| 172 | } |
| 173 | |
| 174 | try { |
| 175 | newTgt = serviceCreds(tempService, cTgt); |
| 176 | } catch (Exception exc) { |
| 177 | newTgt = null; |
| 178 | } |
| 179 | } |
| 180 | } // Ends 'if (newTgt == null)' |
| 181 | |
| 182 | if (newTgt == null) |
| 183 | { |
| 184 | if (DEBUG) |
| 185 | { |
| 186 | System.out.println(">>> Credentials acquireServiceCreds: no tgt; cannot get creds"); |
| 187 | } |
| 188 | break; |
| 189 | } |
| 190 | |
| 191 | /* |
| 192 | * We have a tgt. It may or may not be for the target. |
| 193 | * If it's for the target realm, we're done looking for a tgt. |
| 194 | */ |
| 195 | |
| 196 | newTgtRealm = newTgt.getServer().getInstanceComponent(); |
| 197 | |
| 198 | if (DEBUG) |
| 199 | { |
| 200 | System.out.println(">>> Credentials acquireServiceCreds: got tgt"); |
| 201 | //printDebug(newTgt); |
| 202 | } |
| 203 | |
| 204 | if (newTgtRealm.equals(serviceRealm)) |
| 205 | { |
| 206 | /* We got the right tgt */ |
| 207 | theTgt = newTgt; |
| 208 | theTgtRealm = newTgtRealm; |
| 209 | break; |
| 210 | } |
| 211 | |
| 212 | /* |
| 213 | * The new tgt is not for the target realm. |
| 214 | * See if the realm of the new tgt is in the list of realms |
| 215 | * and continue looking from there. |
| 216 | */ |
| 217 | |
| 218 | for (k = i+1; k < realms.length; k++) |
| 219 | { |
| 220 | if (newTgtRealm.equals(realms[k])) |
| 221 | { |
| 222 | break; |
| 223 | } |
| 224 | } |
| 225 | |
| 226 | if (k < realms.length) |
| 227 | { |
| 228 | /* |
| 229 | * (re)set the counter so we start looking |
| 230 | * from the realm we just obtained a tgt for. |
| 231 | */ |
| 232 | i = k; |
| 233 | cTgt = newTgt; |
| 234 | |
| 235 | if (DEBUG) |
| 236 | { |
| 237 | System.out.println(">>> Credentials acquireServiceCreds: continuing with main loop counter reset to " + i); |
| 238 | } |
| 239 | |
| 240 | continue; |
| 241 | } |
| 242 | else |
| 243 | { |
| 244 | /* |
| 245 | * The new tgt's realm is not in the heirarchy of realms. |
| 246 | * It's probably not safe to get a tgt from |
| 247 | * a tgs that is outside the known list of realms. |
| 248 | * Give up now. |
| 249 | */ |
| 250 | |
| 251 | break; |
| 252 | } |
| 253 | } // Ends outermost/main 'for' loop |
| 254 | |
| 255 | Credentials theCreds = null; |
| 256 | |
| 257 | if (theTgt != null) |
| 258 | { |
| 259 | /* We have the right tgt. Let's get the service creds */ |
| 260 | |
| 261 | if (DEBUG) |
| 262 | { |
| 263 | System.out.println(">>> Credentials acquireServiceCreds: got right tgt"); |
| 264 | |
| 265 | //printDebug(theTgt); |
| 266 | |
| 267 | System.out.println(">>> Credentials acquireServiceCreds: obtaining service creds for " + sname); |
| 268 | } |
| 269 | |
| 270 | try { |
| 271 | theCreds = serviceCreds(sname, theTgt); |
| 272 | } catch (Exception exc) { |
| 273 | if (DEBUG) |
| 274 | System.out.println(exc); |
| 275 | theCreds = null; |
| 276 | } |
| 277 | } |
| 278 | |
| 279 | if (theCreds != null) |
| 280 | { |
| 281 | if (DEBUG) |
| 282 | { |
| 283 | System.out.println(">>> Credentials acquireServiceCreds: returning creds:"); |
| 284 | Credentials.printDebug(theCreds); |
| 285 | } |
| 286 | return theCreds; |
| 287 | } |
| 288 | throw new KrbApErrException(Krb5.KRB_AP_ERR_GEN_CRED, |
| 289 | "No service creds"); |
| 290 | } |
| 291 | |
| 292 | /* |
| 293 | * This method does the real job to request the service credential. |
| 294 | */ |
| 295 | private static Credentials serviceCreds( |
| 296 | ServiceName service, Credentials ccreds) |
| 297 | throws KrbException, IOException { |
| 298 | return new KrbTgsReq(ccreds, service).sendAndGetCreds(); |
| 299 | } |
| 300 | } |