417 lines
14 KiB
Java
417 lines
14 KiB
Java
/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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*
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* (C) Copyright IBM Corp. 1999 All Rights Reserved.
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* Copyright 1997 The Open Group Research Institute. All rights reserved.
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*/
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package sun.security.krb5.internal.ccache;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.StringTokenizer;
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import sun.misc.IOUtils;
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import sun.security.krb5.*;
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import sun.security.krb5.internal.*;
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import sun.security.krb5.internal.util.KrbDataInputStream;
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/**
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* This class extends KrbDataInputStream. It is used for parsing FCC-format
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* data from file to memory.
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*
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* @author Yanni Zhang
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*
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*/
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public class CCacheInputStream extends KrbDataInputStream implements FileCCacheConstants {
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/*
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* FCC version 2 contains type information for principals. FCC
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* version 1 does not.
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*
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* FCC version 3 contains keyblock encryption type information, and is
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* architecture independent. Previous versions are not.
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*
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* The code will accept version 1, 2, and 3 ccaches, and depending
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* what KRB5_FCC_DEFAULT_FVNO is set to, it will create version 1, 2,
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* or 3 FCC caches.
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*
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* The default credentials cache should be type 3 for now (see
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* init_ctx.c).
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*/
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/* V4 of the credentials cache format allows for header tags */
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private static boolean DEBUG = Krb5.DEBUG;
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public CCacheInputStream(InputStream is){
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super(is);
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}
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/* Read tag field introduced in KRB5_FCC_FVNO_4 */
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// this needs to be public for Kinit.
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public Tag readTag() throws IOException {
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char[] buf = new char[1024];
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int len;
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int tag = -1;
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int taglen;
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Integer time_offset = null;
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Integer usec_offset = null;
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len = read(2);
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if (len < 0) {
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throw new IOException("stop.");
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}
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if (len > buf.length) {
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throw new IOException("Invalid tag length.");
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}
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while (len > 0) {
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tag = read(2);
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taglen = read(2);
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switch (tag) {
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case FCC_TAG_DELTATIME:
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time_offset = new Integer(read(4));
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usec_offset = new Integer(read(4));
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break;
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default:
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}
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len = len - (4 + taglen);
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}
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return new Tag(len, tag, time_offset, usec_offset);
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}
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/*
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* In file-based credential cache, the realm name is stored as part of
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* principal name at the first place.
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*/
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// made public for KinitOptions to call directly
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public PrincipalName readPrincipal(int version) throws IOException, RealmException {
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int type, length, namelength, kret;
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String[] pname = null;
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String realm;
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/* Read principal type */
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if (version == KRB5_FCC_FVNO_1) {
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type = KRB5_NT_UNKNOWN;
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} else {
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type = read(4);
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}
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length = readLength4();
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List<String> result = new ArrayList<String>();
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/*
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* DCE includes the principal's realm in the count; the new format
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* does not.
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*/
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if (version == KRB5_FCC_FVNO_1)
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length--;
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for (int i = 0; i <= length; i++) {
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namelength = readLength4();
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byte[] bytes = IOUtils.readExactlyNBytes(this, namelength);
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result.add(new String(bytes));
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}
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if (result.isEmpty()) {
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throw new IOException("No realm or principal");
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}
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if (isRealm(result.get(0))) {
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realm = result.remove(0);
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if (result.isEmpty()) {
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throw new IOException("No principal name components");
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}
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return new PrincipalName(
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type,
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result.toArray(new String[result.size()]),
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new Realm(realm));
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}
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try {
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return new PrincipalName(
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type,
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result.toArray(new String[result.size()]),
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Realm.getDefault());
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} catch (RealmException re) {
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return null;
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}
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}
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/*
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* In practice, a realm is named by uppercasing the DNS domain name. we currently
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* rely on this to determine if the string within the principal identifier is realm
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* name.
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*
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*/
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boolean isRealm(String str) {
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try {
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Realm r = new Realm(str);
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}
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catch (Exception e) {
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return false;
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}
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StringTokenizer st = new StringTokenizer(str, ".");
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String s;
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while (st.hasMoreTokens()) {
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s = st.nextToken();
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for (int i = 0; i < s.length(); i++) {
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if (s.charAt(i) >= 141) {
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return false;
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}
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}
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}
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return true;
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}
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EncryptionKey readKey(int version) throws IOException {
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int keyType, keyLen;
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keyType = read(2);
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if (version == KRB5_FCC_FVNO_3)
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read(2); /* keytype recorded twice in fvno 3 */
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keyLen = readLength4();
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byte[] bytes = IOUtils.readExactlyNBytes(this, keyLen);
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return new EncryptionKey(bytes, keyType, new Integer(version));
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}
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long[] readTimes() throws IOException {
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long[] times = new long[4];
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times[0] = (long)read(4) * 1000;
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times[1] = (long)read(4) * 1000;
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times[2] = (long)read(4) * 1000;
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times[3] = (long)read(4) * 1000;
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return times;
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}
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boolean readskey() throws IOException {
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if (read() == 0) {
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return false;
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}
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else return true;
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}
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HostAddress[] readAddr() throws IOException, KrbApErrException {
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int numAddrs, addrType, addrLength;
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numAddrs = readLength4();
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if (numAddrs > 0) {
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List<HostAddress> addrs = new ArrayList<>();
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for (int i = 0; i < numAddrs; i++) {
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addrType = read(2);
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addrLength = readLength4();
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if (!(addrLength == 4 || addrLength == 16)) {
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if (DEBUG) {
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System.out.println("Incorrect address format.");
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}
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return null;
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}
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byte[] result = new byte[addrLength];
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for (int j = 0; j < addrLength; j++)
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result[j] = (byte)read(1);
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addrs.add(new HostAddress(addrType, result));
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}
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return addrs.toArray(new HostAddress[addrs.size()]);
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}
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return null;
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}
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AuthorizationDataEntry[] readAuth() throws IOException {
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int num, adtype, adlength;
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num = readLength4();
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if (num > 0) {
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List<AuthorizationDataEntry> auData = new ArrayList<>();
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byte[] data = null;
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for (int i = 0; i < num; i++) {
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adtype = read(2);
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adlength = readLength4();
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data = IOUtils.readExactlyNBytes(this, adlength);
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auData.add(new AuthorizationDataEntry(adtype, data));
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}
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return auData.toArray(new AuthorizationDataEntry[auData.size()]);
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}
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else return null;
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}
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byte[] readData() throws IOException {
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int length;
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length = readLength4();
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if (length == 0) {
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return null;
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} else {
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return IOUtils.readExactlyNBytes(this, length);
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}
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}
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boolean[] readFlags() throws IOException {
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boolean[] flags = new boolean[Krb5.TKT_OPTS_MAX+1];
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int ticketFlags;
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ticketFlags = read(4);
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if ((ticketFlags & 0x40000000) == TKT_FLG_FORWARDABLE)
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flags[1] = true;
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if ((ticketFlags & 0x20000000) == TKT_FLG_FORWARDED)
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flags[2] = true;
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if ((ticketFlags & 0x10000000) == TKT_FLG_PROXIABLE)
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flags[3] = true;
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if ((ticketFlags & 0x08000000) == TKT_FLG_PROXY)
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flags[4] = true;
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if ((ticketFlags & 0x04000000) == TKT_FLG_MAY_POSTDATE)
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flags[5] = true;
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if ((ticketFlags & 0x02000000) == TKT_FLG_POSTDATED)
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flags[6] = true;
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if ((ticketFlags & 0x01000000) == TKT_FLG_INVALID)
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flags[7] = true;
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if ((ticketFlags & 0x00800000) == TKT_FLG_RENEWABLE)
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flags[8] = true;
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if ((ticketFlags & 0x00400000) == TKT_FLG_INITIAL)
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flags[9] = true;
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if ((ticketFlags & 0x00200000) == TKT_FLG_PRE_AUTH)
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flags[10] = true;
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if ((ticketFlags & 0x00100000) == TKT_FLG_HW_AUTH)
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flags[11] = true;
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if (DEBUG) {
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String msg = ">>> CCacheInputStream: readFlags() ";
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if (flags[1] == true) {
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msg += " FORWARDABLE;";
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}
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if (flags[2] == true) {
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msg += " FORWARDED;";
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}
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if (flags[3] == true) {
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msg += " PROXIABLE;";
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}
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if (flags[4] == true) {
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msg += " PROXY;";
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}
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if (flags[5] == true) {
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msg += " MAY_POSTDATE;";
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}
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if (flags[6] == true) {
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msg += " POSTDATED;";
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}
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if (flags[7] == true) {
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msg += " INVALID;";
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}
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if (flags[8] == true) {
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msg += " RENEWABLE;";
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}
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if (flags[9] == true) {
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msg += " INITIAL;";
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}
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if (flags[10] == true) {
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msg += " PRE_AUTH;";
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}
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if (flags[11] == true) {
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msg += " HW_AUTH;";
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}
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System.out.println(msg);
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}
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return flags;
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}
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/**
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* Reads the next cred or config entry in stream.
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* @return the next cred or config entry, null if data unparseable.
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*
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* When data is unparseable, this method makes sure the correct number of
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* bytes are consumed so it's safe to start reading the next element.
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*/
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Object readCred(int version) throws IOException,RealmException, KrbApErrException, Asn1Exception {
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PrincipalName cpname = null;
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try {
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cpname = readPrincipal(version);
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} catch (Exception e) {
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// Do not return here. All data for this cred should be fully
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// consumed so that we can read the next one.
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}
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if (DEBUG) {
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System.out.println(">>>DEBUG <CCacheInputStream> client principal is " + cpname);
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}
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PrincipalName spname = null;
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try {
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spname = readPrincipal(version);
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} catch (Exception e) {
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// same as above
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}
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if (DEBUG) {
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System.out.println(">>>DEBUG <CCacheInputStream> server principal is " + spname);
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}
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EncryptionKey key = readKey(version);
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if (DEBUG) {
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System.out.println(">>>DEBUG <CCacheInputStream> key type: " + key.getEType());
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}
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long times[] = readTimes();
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KerberosTime authtime = new KerberosTime(times[0]);
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KerberosTime starttime =
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(times[1]==0) ? null : new KerberosTime(times[1]);
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KerberosTime endtime = new KerberosTime(times[2]);
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KerberosTime renewTill =
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(times[3]==0) ? null : new KerberosTime(times[3]);
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if (DEBUG) {
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System.out.println(">>>DEBUG <CCacheInputStream> auth time: " + authtime.toDate().toString());
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System.out.println(">>>DEBUG <CCacheInputStream> start time: " +
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((starttime==null)?"null":starttime.toDate().toString()));
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System.out.println(">>>DEBUG <CCacheInputStream> end time: " + endtime.toDate().toString());
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System.out.println(">>>DEBUG <CCacheInputStream> renew_till time: " +
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((renewTill==null)?"null":renewTill.toDate().toString()));
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}
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boolean skey = readskey();
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boolean flags[] = readFlags();
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TicketFlags tFlags = new TicketFlags(flags);
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HostAddress addr[] = readAddr();
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HostAddresses addrs = null;
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if (addr != null) {
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addrs = new HostAddresses(addr);
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}
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AuthorizationDataEntry[] auDataEntry = readAuth();
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AuthorizationData auData = null;
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if (auDataEntry != null) {
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auData = new AuthorizationData(auDataEntry);
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}
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byte[] ticketData = readData();
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byte[] ticketData2 = readData();
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// Skip this cred if either cpname or spname isn't created.
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if (cpname == null || spname == null) {
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return null;
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}
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try {
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if (spname.getRealmString().equals("X-CACHECONF:")) {
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String[] nameParts = spname.getNameStrings();
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if (nameParts[0].equals("krb5_ccache_conf_data")) {
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return new CredentialsCache.ConfigEntry(nameParts[1],
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nameParts.length > 2 ? new PrincipalName(nameParts[2]) : null,
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ticketData);
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}
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}
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return new Credentials(cpname, spname, key, authtime, starttime,
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endtime, renewTill, skey, tFlags,
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addrs, auData,
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ticketData != null ? new Ticket(ticketData) : null,
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ticketData2 != null ? new Ticket(ticketData2) : null);
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} catch (Exception e) { // If any of new Ticket(*) fails.
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if (DEBUG) {
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e.printStackTrace(System.out);
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}
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return null;
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}
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}
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}
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