/*
* Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
*
* (C) Copyright IBM Corp. 1999 All Rights Reserved.
* Copyright 1997 The Open Group Research Institute. All rights reserved.
*/
package sun.security.krb5;
import java.io.File;
import java.io.FileInputStream;
import java.util.Hashtable;
import java.util.Vector;
import java.util.ArrayList;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
import java.util.Enumeration;
import java.util.StringTokenizer;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.List;
import sun.net.dns.ResolverConfiguration;
import sun.security.krb5.internal.crypto.EType;
import sun.security.krb5.internal.ktab.*;
import sun.security.krb5.internal.Krb5;
/**
* This class maintains key-value pairs of Kerberos configurable constants
* from configuration file or from user specified system properties.
*/
public class Config {
/*
* Only allow a single instance of Config.
*/
private static Config singleton = null;
/*
* Hashtable used to store configuration infomation.
*/
private Hashtable<String,Object> stanzaTable;
private static boolean DEBUG = sun.security.krb5.internal.Krb5.DEBUG;
// these are used for hexdecimal calculation.
private static final int BASE16_0 = 1;
private static final int BASE16_1 = 16;
private static final int BASE16_2 = 16 * 16;
private static final int BASE16_3 = 16 * 16 * 16;
/**
* Specified by system properties. Must be both null or non-null.
*/
private final String defaultRealm;
private final String defaultKDC;
// used for native interface
private static native String getWindowsDirectory(boolean isSystem);
/**
* Gets an instance of Config class. One and only one instance (the
* singleton) is returned.
*
* @exception KrbException if error occurs when constructing a Config
* instance. Possible causes would be either of java.security.krb5.realm or
* java.security.krb5.kdc not specified, error reading configuration file.
*/
public static synchronized Config getInstance() throws KrbException {
if (singleton == null) {
singleton = new Config();
}
return singleton;
}
/**
* Refresh and reload the Configuration. This could involve,
* for example reading the Configuration file again or getting
* the java.security.krb5.* system properties again.
*
* @exception KrbException if error occurs when constructing a Config
* instance. Possible causes would be either of java.security.krb5.realm or
* java.security.krb5.kdc not specified, error reading configuration file.
*/
public static synchronized void refresh() throws KrbException {
singleton = new Config();
KdcComm.initStatic();
}
private static boolean isMacosLionOrBetter() {
// split the "10.x.y" version number
String osVersion = System.getProperty("os.version");
String[] fragments = osVersion.split("\\.");
// sanity check the "10." part of the version
if (!fragments[0].equals("10")) return false;
if (fragments.length < 2) return false;
// check if Mac OS X 10.7(.y)
try {
int minorVers = Integer.parseInt(fragments[1]);
if (minorVers >= 7) return true;
} catch (NumberFormatException e) {
// was not an integer
}
return false;
}
/**
* Private constructor - can not be instantiated externally.
*/
private Config() throws KrbException {
/*
* If either one system property is specified, we throw exception.
*/
String tmp =
java.security.AccessController.doPrivileged(
new sun.security.action.GetPropertyAction
("java.security.krb5.kdc"));
if (tmp != null) {
// The user can specify a list of kdc hosts separated by ":"
defaultKDC = tmp.replace(':', ' ');
} else {
defaultKDC = null;
}
defaultRealm =
java.security.AccessController.doPrivileged(
new sun.security.action.GetPropertyAction
("java.security.krb5.realm"));
if ((defaultKDC == null && defaultRealm != null) ||
(defaultRealm == null && defaultKDC != null)) {
throw new KrbException
("System property java.security.krb5.kdc and " +
"java.security.krb5.realm both must be set or " +
"neither must be set.");
}
// Always read the Kerberos configuration file
try {
Vector<String> configFile;
configFile = loadConfigFile();
if (configFile == null && isMacosLionOrBetter()) {
stanzaTable = SCDynamicStoreConfig.getConfig();
} else {
stanzaTable = parseStanzaTable(configFile);
}
} catch (IOException ioe) {
// No krb5.conf, no problem. We'll use DNS or system property etc.
}
}
/**
* Gets the default int value for the specified name.
* @param name the name.
* @return the default Integer, null is returned if no such name and
* value are found in configuration file, or error occurs when parsing
* string to integer.
*/
public int getDefaultIntValue(String name) {
String result = null;
int value = Integer.MIN_VALUE;
result = getDefault(name);
if (result != null) {
try {
value = parseIntValue(result);
} catch (NumberFormatException e) {
if (DEBUG) {
System.out.println("Exception in getting value of " +
name + " " +
e.getMessage());
System.out.println("Setting " + name +
" to minimum value");
}
value = Integer.MIN_VALUE;
}
}
return value;
}
/**
* Gets the default int value for the specified name in the specified
* section. <br>This method is quicker by using section name as the
* search key.
* @param name the name.
* @param sectio the name string of the section.
* @return the default Integer, null is returned if no such name and
* value are found in configuration file, or error occurs when parsing
* string to integer.
*/
public int getDefaultIntValue(String name, String section) {
String result = null;
int value = Integer.MIN_VALUE;
result = getDefault(name, section);
if (result != null) {
try {
value = parseIntValue(result);
} catch (NumberFormatException e) {
if (DEBUG) {
System.out.println("Exception in getting value of " +
name +" in section " +
section + " " + e.getMessage());
System.out.println("Setting " + name +
" to minimum value");
}
value = Integer.MIN_VALUE;
}
}
return value;
}
/**
* Gets the default string value for the specified name.
* @param name the name.
* @return the default value, null is returned if it cannot be found.
*/
public String getDefault(String name) {
if (stanzaTable == null) {
return null;
} else {
return getDefault(name, stanzaTable);
}
}
/**
* This method does the real job to recursively search through the
* stanzaTable.
* @param k the key string.
* @param t stanzaTable or sub hashtable within it.
* @return the value found in config file, returns null if no value
* matched with the key is found.
*/
private String getDefault(String k, Hashtable t) {
String result = null;
String key;
if (stanzaTable != null) {
for (Enumeration e = t.keys(); e.hasMoreElements(); ) {
key = (String)e.nextElement();
Object ob = t.get(key);
if (ob instanceof Hashtable) {
result = getDefault(k, (Hashtable)ob);
if (result != null) {
return result;
}
} else if (key.equalsIgnoreCase(k)) {
if (ob instanceof String) {
return (String)(t.get(key));
} else if (ob instanceof Vector) {
result = "";
int length = ((Vector)ob).size();
for (int i = 0; i < length; i++) {
if (i == length -1) {
result +=
(String)(((Vector)ob).elementAt(i));
} else {
result +=
(String)(((Vector)ob).elementAt(i)) + " ";
}
}
return result;
}
}
}
}
return result;
}
/**
* Gets the default string value for the specified name in the
* specified section.
* <br>This method is quicker by using the section name as the search key.
* @param name the name.
* @param section the name of the section.
* @return the default value, null is returned if it cannot be found.
*/
public String getDefault(String name, String section) {
String stanzaName;
String result = null;
Hashtable subTable;
if (stanzaTable != null) {
for (Enumeration e = stanzaTable.keys(); e.hasMoreElements(); ) {
stanzaName = (String)e.nextElement();
subTable = (Hashtable)stanzaTable.get(stanzaName);
if (stanzaName.equalsIgnoreCase(section)) {
if (subTable.containsKey(name)) {
return (String)(subTable.get(name));
}
} else if (subTable.containsKey(section)) {
Object ob = subTable.get(section);
if (ob instanceof Hashtable) {
Hashtable temp = (Hashtable)ob;
if (temp.containsKey(name)) {
Object object = temp.get(name);
if (object instanceof Vector) {
result = "";
int length = ((Vector)object).size();
for (int i = 0; i < length; i++) {
if (i == length - 1) {
result +=
(String)(((Vector)object).elementAt(i));
} else {
result +=
(String)(((Vector)object).elementAt(i))
+ " ";
}
}
} else {
result = (String)object;
}
}
}
}
}
}
return result;
}
/**
* Gets the default boolean value for the specified name.
* @param name the name.
* @return the default boolean value, false is returned if it cannot be
* found.
*/
public boolean getDefaultBooleanValue(String name) {
String val = null;
if (stanzaTable == null) {
val = null;
} else {
val = getDefault(name, stanzaTable);
}
if (val != null && val.equalsIgnoreCase("true")) {
return true;
} else {
return false;
}
}
/**
* Gets the default boolean value for the specified name in the
* specified section.
* <br>This method is quicker by using the section name as the search key.
* @param name the name.
* @param section the name of the section.
* @return the default boolean value, false is returned if it cannot be
* found.
*/
public boolean getDefaultBooleanValue(String name, String section) {
String val = getDefault(name, section);
if (val != null && val.equalsIgnoreCase("true")) {
return true;
} else {
return false;
}
}
/**
* Parses a string to an integer. The convertible strings include the
* string representations of positive integers, negative integers, and
* hex decimal integers. Valid inputs are, e.g., -1234, +1234,
* 0x40000.
*
* @param input the String to be converted to an Integer.
* @return an numeric value represented by the string
* @exception NumberFormationException if the String does not contain a
* parsable integer.
*/
private int parseIntValue(String input) throws NumberFormatException {
int value = 0;
if (input.startsWith("+")) {
String temp = input.substring(1);
return Integer.parseInt(temp);
} else if (input.startsWith("0x")) {
String temp = input.substring(2);
char[] chars = temp.toCharArray();
if (chars.length > 8) {
throw new NumberFormatException();
} else {
for (int i = 0; i < chars.length; i++) {
int index = chars.length - i - 1;
switch (chars[i]) {
case '0':
value += 0;
break;
case '1':
value += 1 * getBase(index);
break;
case '2':
value += 2 * getBase(index);
break;
case '3':
value += 3 * getBase(index);
break;
case '4':
value += 4 * getBase(index);
break;
case '5':
value += 5 * getBase(index);
break;
case '6':
value += 6 * getBase(index);
break;
case '7':
value += 7 * getBase(index);
break;
case '8':
value += 8 * getBase(index);
break;
case '9':
value += 9 * getBase(index);
break;
case 'a':
case 'A':
value += 10 * getBase(index);
break;
case 'b':
case 'B':
value += 11 * getBase(index);
break;
case 'c':
case 'C':
value += 12 * getBase(index);
break;
case 'd':
case 'D':
value += 13 * getBase(index);
break;
case 'e':
case 'E':
value += 14 * getBase(index);
break;
case 'f':
case 'F':
value += 15 * getBase(index);
break;
default:
throw new NumberFormatException("Invalid numerical format");
}
}
}
if (value < 0) {
throw new NumberFormatException("Data overflow.");
}
} else {
value = Integer.parseInt(input);
}
return value;
}
private int getBase(int i) {
int result = 16;
switch (i) {
case 0:
result = BASE16_0;
break;
case 1:
result = BASE16_1;
break;
case 2:
result = BASE16_2;
break;
case 3:
result = BASE16_3;
break;
default:
for (int j = 1; j < i; j++) {
result *= 16;
}
}
return result;
}
/**
* Finds the matching value in the hashtable.
*/
private String find(String key1, String key2) {
String result;
if ((stanzaTable != null) &&
((result = (String)
(((Hashtable)(stanzaTable.get(key1))).get(key2))) != null)) {
return result;
} else {
return "";
}
}
/**
* Reads name/value pairs to the memory from the configuration
* file. The default location of the configuration file is in java home
* directory.
*
* Configuration file contains information about the default realm,
* ticket parameters, location of the KDC and the admin server for
* known realms, etc. The file is divided into sections. Each section
* contains one or more name/value pairs with one pair per line. A
* typical file would be:
* [libdefaults]
* default_realm = EXAMPLE.COM
* default_tgs_enctypes = des-cbc-md5
* default_tkt_enctypes = des-cbc-md5
* [realms]
* EXAMPLE.COM = {
* kdc = kerberos.example.com
* kdc = kerberos-1.example.com
* admin_server = kerberos.example.com
* }
* SAMPLE_COM = {
* kdc = orange.sample.com
* admin_server = orange.sample.com
* }
* [domain_realm]
* blue.sample.com = TEST.SAMPLE.COM
* .backup.com = EXAMPLE.COM
*/
private Vector<String> loadConfigFile() throws IOException {
try {
final String fileName = getFileName();
if (!fileName.equals("")) {
BufferedReader br = new BufferedReader(new InputStreamReader(
java.security.AccessController.doPrivileged(
new java.security.PrivilegedExceptionAction<FileInputStream> () {
public FileInputStream run() throws IOException {
return new FileInputStream(fileName);
}
})));
String Line;
Vector<String> v = new Vector<>();
String previous = null;
while ((Line = br.readLine()) != null) {
// ignore comments and blank line in the configuration file.
// Comments start with #.
if (!(Line.startsWith("#") || Line.trim().isEmpty())) {
String current = Line.trim();
// In practice, a subsection might look like:
// EXAMPLE.COM =
// {
// kdc = kerberos.example.com
// ...
// }
// Before parsed into stanza table, it needs to be
// converted into formal style:
// EXAMPLE.COM = {
// kdc = kerberos.example.com
// ...
// }
//
// So, if a line is "{", adhere to the previous line.
if (current.equals("{")) {
if (previous == null) {
throw new IOException(
"Config file should not start with \"{\"");
}
previous += " " + current;
} else {
if (previous != null) {
v.addElement(previous);
}
previous = current;
}
}
}
if (previous != null) {
v.addElement(previous);
}
br.close();
return v;
}
return null;
} catch (java.security.PrivilegedActionException pe) {
throw (IOException)pe.getException();
}
}
/**
* Parses stanza names and values from configuration file to
* stanzaTable (Hashtable). Hashtable key would be stanza names,
* (libdefaults, realms, domain_realms, etc), and the hashtable value
* would be another hashtable which contains the key-value pairs under
* a stanza name.
*/
private Hashtable<String,Object> parseStanzaTable(Vector<String> v) throws KrbException {
if (v == null) {
throw new KrbException("I/O error while reading" +
" configuration file.");
}
Hashtable<String,Object> table = new Hashtable<>();
for (int i = 0; i < v.size(); i++) {
String line = v.elementAt(i).trim();
if (line.equalsIgnoreCase("[realms]")) {
for (int count = i + 1; count < v.size() + 1; count++) {
// find the next stanza name
if ((count == v.size()) ||
(v.elementAt(count).startsWith("["))) {
Hashtable<String,Hashtable<String,Vector<String>>> temp =
new Hashtable<>();
temp = parseRealmField(v, i + 1, count);
table.put("realms", temp);
i = count - 1;
break;
}
}
} else if (line.equalsIgnoreCase("[capaths]")) {
for (int count = i + 1; count < v.size() + 1; count++) {
// find the next stanza name
if ((count == v.size()) ||
(v.elementAt(count).startsWith("["))) {
Hashtable<String,Hashtable<String,Vector<String>>> temp =
new Hashtable<>();
temp = parseRealmField(v, i + 1, count);
table.put("capaths", temp);
i = count - 1;
break;
}
}
} else if (line.startsWith("[") && line.endsWith("]")) {
String key = line.substring(1, line.length() - 1);
for (int count = i + 1; count < v.size() + 1; count++) {
// find the next stanza name
if ((count == v.size()) ||
(v.elementAt(count).startsWith("["))) {
Hashtable<String,String> temp =
parseField(v, i + 1, count);
table.put(key, temp);
i = count - 1;
break;
}
}
}
}
return table;
}
/**
* Gets the default configuration file name. This method will never
* return null.
*
* If the system property "java.security.krb5.conf" is defined, we'll
* use its value, no matter if the file exists or not. Otherwise,
* the file will be searched in a list of possible loations in the
* following order:
*
* 1. at Java home lib\security directory with "krb5.conf" name,
* 2. at windows directory with the name of "krb5.ini" for Windows,
* /etc/krb5/krb5.conf for Solaris, /etc/krb5.conf otherwise.
*
* Note: When the Terminal Service is started in Windows (from 2003),
* there are two kinds of Windows directories: A system one (say,
* C:\Windows), and a user-private one (say, C:\Users\Me\Windows).
* We will first look for krb5.ini in the user-private one. If not
* found, try the system one instead.
*/
private String getFileName() {
String name =
java.security.AccessController.doPrivileged(
new sun.security.action.
GetPropertyAction("java.security.krb5.conf"));
if (name == null) {
name = java.security.AccessController.doPrivileged(
new sun.security.action.
GetPropertyAction("java.home")) + File.separator +
"lib" + File.separator + "security" +
File.separator + "krb5.conf";
if (!fileExists(name)) {
name = null;
String osname =
java.security.AccessController.doPrivileged(
new sun.security.action.GetPropertyAction("os.name"));
if (osname.startsWith("Windows")) {
try {
Credentials.ensureLoaded();
} catch (Exception e) {
// ignore exceptions
}
if (Credentials.alreadyLoaded) {
String path = getWindowsDirectory(false);
if (path != null) {
if (path.endsWith("\\")) {
path = path + "krb5.ini";
} else {
path = path + "\\krb5.ini";
}
if (fileExists(path)) {
name = path;
}
}
if (name == null) {
path = getWindowsDirectory(true);
if (path != null) {
if (path.endsWith("\\")) {
path = path + "krb5.ini";
} else {
path = path + "\\krb5.ini";
}
name = path;
}
}
}
if (name == null) {
name = "c:\\winnt\\krb5.ini";
}
} else if (osname.startsWith("SunOS")) {
name = "/etc/krb5/krb5.conf";
} else if (osname.contains("OS X")) {
if (isMacosLionOrBetter()) return "";
name = findMacosConfigFile();
} else {
name = "/etc/krb5.conf";
}
}
}
if (DEBUG) {
System.out.println("Config name: " + name);
}
return name;
}
private String getProperty(String property) {
return (String)java.security.AccessController.doPrivileged(new sun.security.action.GetPropertyAction(property));
}
private String findMacosConfigFile() {
String userHome = getProperty("user.home");
final String PREF_FILE = "/Library/Preferences/edu.mit.Kerberos";
String userPrefs=userHome + PREF_FILE;
if (fileExists(userPrefs)) {
return userPrefs;
}
if (fileExists(PREF_FILE)) {
return PREF_FILE;
}
if (fileExists("/etc/krb5.conf")) {
return "/etc/krb5.conf";
}
return "";
}
private static String trimmed(String s) {
s = s.trim();
if (s.charAt(0) == '"' && s.charAt(s.length()-1) == '"' ||
s.charAt(0) == '\'' && s.charAt(s.length()-1) == '\'') {
s = s.substring(1, s.length()-1).trim();
}
return s;
}
/**
* Parses key-value pairs under a stanza name.
*/
private Hashtable<String,String> parseField(Vector<String> v, int start, int end) {
Hashtable<String,String> table = new Hashtable<>();
String line;
for (int i = start; i < end; i++) {
line = v.elementAt(i);
for (int j = 0; j < line.length(); j++) {
if (line.charAt(j) == '=') {
String key = (line.substring(0, j)).trim();
String value = trimmed(line.substring(j + 1));
table.put(key, value);
break;
}
}
}
return table;
}
/**
* Parses key-value pairs under [realms]. The key would be the realm
* name, the value would be another hashtable which contains
* information for the realm given within a pair of braces.
*/
private Hashtable<String,Hashtable<String,Vector<String>>> parseRealmField(Vector<String> v, int start, int end) {
Hashtable<String,Hashtable<String,Vector<String>>> table = new Hashtable<>();
String line;
for (int i = start; i < end; i++) {
line = v.elementAt(i).trim();
if (line.endsWith("{")) {
String key = "";
for (int j = 0; j < line.length(); j++) {
if (line.charAt(j) == '=') {
key = line.substring(0, j).trim();
// get the key
break;
}
}
for (int k = i + 1; k < end; k++) {
boolean found = false;
line = v.elementAt(k).trim();
for (int l = 0; l < line.length(); l++) {
if (line.charAt(l) == '}') {
found = true;
break;
}
}
if (found == true) {
Hashtable<String,Vector<String>> temp = parseRealmFieldEx(v, i + 1, k);
table.put(key, temp);
i = k;
found = false;
break;
}
}
}
}
return table;
}
/**
* Parses key-value pairs within each braces under [realms].
*/
private Hashtable<String,Vector<String>> parseRealmFieldEx(Vector<String> v, int start, int end) {
Hashtable<String,Vector<String>> table = new Hashtable<>();
Vector<String> keyVector = new Vector<>();
Vector<String> nameVector = new Vector<>();
String line = "";
String key;
for (int i = start; i < end; i++) {
line = v.elementAt(i);
for (int j = 0; j < line.length(); j++) {
if (line.charAt(j) == '=') {
int index;
key = line.substring(0, j).trim();
if (! exists(key, keyVector)) {
keyVector.addElement(key);
nameVector = new Vector<String> ();
} else {
nameVector = table.get(key);
}
nameVector.addElement(trimmed(line.substring(j + 1)));
table.put(key, nameVector);
break;
}
}
}
return table;
}
/**
* Compares the key with the known keys to see if it exists.
*/
private boolean exists(String key, Vector v) {
boolean exists = false;
for (int i = 0; i < v.size(); i++) {
if (((String)(v.elementAt(i))).equals(key)) {
exists = true;
}
}
return exists;
}
/**
* For testing purpose. This method lists all information being parsed from
* the configuration file to the hashtable.
*/
public void listTable() {
listTable(stanzaTable);
}
private void listTable(Hashtable table) {
Vector v = new Vector();
String key;
if (stanzaTable != null) {
for (Enumeration e = table.keys(); e.hasMoreElements(); ) {
key = (String)e.nextElement();
Object object = table.get(key);
if (table == stanzaTable) {
System.out.println("[" + key + "]");
}
if (object instanceof Hashtable) {
if (table != stanzaTable)
System.out.println("\t" + key + " = {");
listTable((Hashtable)object);
if (table != stanzaTable)
System.out.println("\t}");
} else if (object instanceof String) {
System.out.println("\t" + key + " = " +
(String)table.get(key));
} else if (object instanceof Vector) {
v = (Vector)object;
for (int i = 0; i < v.size(); i++) {
System.out.println("\t" + key + " = " +
(String)v.elementAt(i));
}
}
}
} else {
System.out.println("Configuration file not found.");
}
}
/**
* Returns the default encryption types.
*
*/
public int[] defaultEtype(String enctypes) {
String default_enctypes;
default_enctypes = getDefault(enctypes, "libdefaults");
String delim = " ";
StringTokenizer st;
int[] etype;
if (default_enctypes == null) {
if (DEBUG) {
System.out.println("Using builtin default etypes for " +
enctypes);
}
etype = EType.getBuiltInDefaults();
} else {
for (int j = 0; j < default_enctypes.length(); j++) {
if (default_enctypes.substring(j, j + 1).equals(",")) {
// only two delimiters are allowed to use
// according to Kerberos DCE doc.
delim = ",";
break;
}
}
st = new StringTokenizer(default_enctypes, delim);
int len = st.countTokens();
ArrayList<Integer> ls = new ArrayList<>(len);
int type;
for (int i = 0; i < len; i++) {
type = getType(st.nextToken());
if ((type != -1) &&
(EType.isSupported(type))) {
ls.add(type);
}
}
if (ls.size() == 0) {
if (DEBUG) {
System.out.println(
"no supported default etypes for " + enctypes);
}
return null;
} else {
etype = new int[ls.size()];
for (int i = 0; i < etype.length; i++) {
etype[i] = ls.get(i);
}
}
}
if (DEBUG) {
System.out.print("default etypes for " + enctypes + ":");
for (int i = 0; i < etype.length; i++) {
System.out.print(" " + etype[i]);
}
System.out.println(".");
}
return etype;
}
/**
* Get the etype and checksum value for the specified encryption and
* checksum type.
*
*/
/*
* This method converts the string representation of encryption type and
* checksum type to int value that can be later used by EType and
* Checksum classes.
*/
public int getType(String input) {
int result = -1;
if (input == null) {
return result;
}
if (input.startsWith("d") || (input.startsWith("D"))) {
if (input.equalsIgnoreCase("des-cbc-crc")) {
result = EncryptedData.ETYPE_DES_CBC_CRC;
} else if (input.equalsIgnoreCase("des-cbc-md5")) {
result = EncryptedData.ETYPE_DES_CBC_MD5;
} else if (input.equalsIgnoreCase("des-mac")) {
result = Checksum.CKSUMTYPE_DES_MAC;
} else if (input.equalsIgnoreCase("des-mac-k")) {
result = Checksum.CKSUMTYPE_DES_MAC_K;
} else if (input.equalsIgnoreCase("des-cbc-md4")) {
result = EncryptedData.ETYPE_DES_CBC_MD4;
} else if (input.equalsIgnoreCase("des3-cbc-sha1") ||
input.equalsIgnoreCase("des3-hmac-sha1") ||
input.equalsIgnoreCase("des3-cbc-sha1-kd") ||
input.equalsIgnoreCase("des3-cbc-hmac-sha1-kd")) {
result = EncryptedData.ETYPE_DES3_CBC_HMAC_SHA1_KD;
}
} else if (input.startsWith("a") || (input.startsWith("A"))) {
// AES
if (input.equalsIgnoreCase("aes128-cts") ||
input.equalsIgnoreCase("aes128-cts-hmac-sha1-96")) {
result = EncryptedData.ETYPE_AES128_CTS_HMAC_SHA1_96;
} else if (input.equalsIgnoreCase("aes256-cts") ||
input.equalsIgnoreCase("aes256-cts-hmac-sha1-96")) {
result = EncryptedData.ETYPE_AES256_CTS_HMAC_SHA1_96;
// ARCFOUR-HMAC
} else if (input.equalsIgnoreCase("arcfour-hmac") ||
input.equalsIgnoreCase("arcfour-hmac-md5")) {
result = EncryptedData.ETYPE_ARCFOUR_HMAC;
}
// RC4-HMAC
} else if (input.equalsIgnoreCase("rc4-hmac")) {
result = EncryptedData.ETYPE_ARCFOUR_HMAC;
} else if (input.equalsIgnoreCase("CRC32")) {
result = Checksum.CKSUMTYPE_CRC32;
} else if (input.startsWith("r") || (input.startsWith("R"))) {
if (input.equalsIgnoreCase("rsa-md5")) {
result = Checksum.CKSUMTYPE_RSA_MD5;
} else if (input.equalsIgnoreCase("rsa-md5-des")) {
result = Checksum.CKSUMTYPE_RSA_MD5_DES;
}
} else if (input.equalsIgnoreCase("hmac-sha1-des3-kd")) {
result = Checksum.CKSUMTYPE_HMAC_SHA1_DES3_KD;
} else if (input.equalsIgnoreCase("hmac-sha1-96-aes128")) {
result = Checksum.CKSUMTYPE_HMAC_SHA1_96_AES128;
} else if (input.equalsIgnoreCase("hmac-sha1-96-aes256")) {
result = Checksum.CKSUMTYPE_HMAC_SHA1_96_AES256;
} else if (input.equalsIgnoreCase("hmac-md5-rc4") ||
input.equalsIgnoreCase("hmac-md5-arcfour") ||
input.equalsIgnoreCase("hmac-md5-enc")) {
result = Checksum.CKSUMTYPE_HMAC_MD5_ARCFOUR;
} else if (input.equalsIgnoreCase("NULL")) {
result = EncryptedData.ETYPE_NULL;
}
return result;
}
/**
* Resets the default kdc realm.
* We do not need to synchronize these methods since assignments are atomic
*
* This method was useless. Kept here in case some class still calls it.
*/
public void resetDefaultRealm(String realm) {
if (DEBUG) {
System.out.println(">>> Config try resetting default kdc " + realm);
}
}
/**
* Check to use addresses in tickets
* use addresses if "no_addresses" or "noaddresses" is set to false
*/
public boolean useAddresses() {
boolean useAddr = false;
// use addresses if "no_addresses" is set to false
String value = getDefault("no_addresses", "libdefaults");
useAddr = (value != null && value.equalsIgnoreCase("false"));
if (useAddr == false) {
// use addresses if "noaddresses" is set to false
value = getDefault("noaddresses", "libdefaults");
useAddr = (value != null && value.equalsIgnoreCase("false"));
}
return useAddr;
}
/**
* Check if need to use DNS to locate Kerberos services
*/
public boolean useDNS(String name) {
String value = getDefault(name, "libdefaults");
if (value == null) {
value = getDefault("dns_fallback", "libdefaults");
if ("false".equalsIgnoreCase(value)) {
return false;
} else {
return true;
}
} else {
return value.equalsIgnoreCase("true");
}
}
/**
* Check if need to use DNS to locate the KDC
*/
public boolean useDNS_KDC() {
return useDNS("dns_lookup_kdc");
}
/*
* Check if need to use DNS to locate the Realm
*/
public boolean useDNS_Realm() {
return useDNS("dns_lookup_realm");
}
/**
* Gets default realm.
* @throws KrbException where no realm can be located
* @return the default realm, always non null
*/
public String getDefaultRealm() throws KrbException {
if (defaultRealm != null) {
return defaultRealm;
}
Exception cause = null;
String realm = getDefault("default_realm", "libdefaults");
if ((realm == null) && useDNS_Realm()) {
// use DNS to locate Kerberos realm
try {
realm = getRealmFromDNS();
} catch (KrbException ke) {
cause = ke;
}
}
if (realm == null) {
realm = java.security.AccessController.doPrivileged(
new java.security.PrivilegedAction<String>() {
@Override
public String run() {
String osname = System.getProperty("os.name");
if (osname.startsWith("Windows")) {
return System.getenv("USERDNSDOMAIN");
}
return null;
}
});
}
if (realm == null) {
KrbException ke = new KrbException("Cannot locate default realm");
if (cause != null) {
ke.initCause(cause);
}
throw ke;
}
return realm;
}
/**
* Returns a list of KDC's with each KDC separated by a space
*
* @param realm the realm for which the KDC list is desired
* @throws KrbException if there's no way to find KDC for the realm
* @return the list of KDCs separated by a space, always non null
*/
public String getKDCList(String realm) throws KrbException {
if (realm == null) {
realm = getDefaultRealm();
}
if (realm.equalsIgnoreCase(defaultRealm)) {
return defaultKDC;
}
Exception cause = null;
String kdcs = getDefault("kdc", realm);
if ((kdcs == null) && useDNS_KDC()) {
// use DNS to locate KDC
try {
kdcs = getKDCFromDNS(realm);
} catch (KrbException ke) {
cause = ke;
}
}
if (kdcs == null) {
kdcs = java.security.AccessController.doPrivileged(
new java.security.PrivilegedAction<String>() {
@Override
public String run() {
String osname = System.getProperty("os.name");
if (osname.startsWith("Windows")) {
String logonServer = System.getenv("LOGONSERVER");
if (logonServer != null
&& logonServer.startsWith("\\\\")) {
logonServer = logonServer.substring(2);
}
return logonServer;
}
return null;
}
});
}
if (kdcs == null) {
if (defaultKDC != null) {
return defaultKDC;
}
KrbException ke = new KrbException("Cannot locate KDC");
if (cause != null) {
ke.initCause(cause);
}
throw ke;
}
return kdcs;
}
/**
* Locate Kerberos realm using DNS
*
* @return the Kerberos realm
*/
private String getRealmFromDNS() throws KrbException {
// use DNS to locate Kerberos realm
String realm = null;
String hostName = null;
try {
hostName = InetAddress.getLocalHost().getCanonicalHostName();
} catch (UnknownHostException e) {
KrbException ke = new KrbException(Krb5.KRB_ERR_GENERIC,
"Unable to locate Kerberos realm: " + e.getMessage());
ke.initCause(e);
throw (ke);
}
// get the domain realm mapping from the configuration
String mapRealm = PrincipalName.mapHostToRealm(hostName);
if (mapRealm == null) {
// No match. Try search and/or domain in /etc/resolv.conf
List<String> srchlist = ResolverConfiguration.open().searchlist();
for (String domain: srchlist) {
realm = checkRealm(domain);
if (realm != null) {
break;
}
}
} else {
realm = checkRealm(mapRealm);
}
if (realm == null) {
throw new KrbException(Krb5.KRB_ERR_GENERIC,
"Unable to locate Kerberos realm");
}
return realm;
}
/**
* Check if the provided realm is the correct realm
* @return the realm if correct, or null otherwise
*/
private static String checkRealm(String mapRealm) {
if (DEBUG) {
System.out.println("getRealmFromDNS: trying " + mapRealm);
}
String[] records = null;
String newRealm = mapRealm;
while ((records == null) && (newRealm != null)) {
// locate DNS TXT record
records = KrbServiceLocator.getKerberosService(newRealm);
newRealm = Realm.parseRealmComponent(newRealm);
// if no DNS TXT records found, try again using sub-realm
}
if (records != null) {
for (int i = 0; i < records.length; i++) {
if (records[i].equalsIgnoreCase(mapRealm)) {
return records[i];
}
}
}
return null;
}
/**
* Locate KDC using DNS
*
* @param realm the realm for which the master KDC is desired
* @return the KDC
*/
private String getKDCFromDNS(String realm) throws KrbException {
// use DNS to locate KDC
String kdcs = null;
String[] srvs = null;
// locate DNS SRV record using UDP
if (DEBUG) {
System.out.println("getKDCFromDNS using UDP");
}
srvs = KrbServiceLocator.getKerberosService(realm, "_udp");
if (srvs == null) {
// locate DNS SRV record using TCP
if (DEBUG) {
System.out.println("getKDCFromDNS using UDP");
}
srvs = KrbServiceLocator.getKerberosService(realm, "_tcp");
}
if (srvs == null) {
// no DNS SRV records
throw new KrbException(Krb5.KRB_ERR_GENERIC,
"Unable to locate KDC for realm " + realm);
}
for (int i = 0; i < srvs.length; i++) {
String value = srvs[i];
for (int j = 0; j < srvs[i].length(); j++) {
// filter the KDC name
if (value.charAt(j) == ':') {
kdcs = (value.substring(0, j)).trim();
}
}
}
return kdcs;
}
private boolean fileExists(String name) {
return java.security.AccessController.doPrivileged(
new FileExistsAction(name));
}
static class FileExistsAction
implements java.security.PrivilegedAction<Boolean> {
private String fileName;
public FileExistsAction(String fileName) {
this.fileName = fileName;
}
public Boolean run() {
return new File(fileName).exists();
}
}
@Override
public String toString() {
StringBuffer sb = new StringBuffer();
toStringIndented("", stanzaTable, sb);
return sb.toString();
}
private static void toStringIndented(String prefix, Object obj,
StringBuffer sb) {
if (obj instanceof String) {
sb.append(prefix);
sb.append(obj);
sb.append('\n');
} else if (obj instanceof Hashtable) {
Hashtable tab = (Hashtable)obj;
for (Object o: tab.keySet()) {
sb.append(prefix);
sb.append(o);
sb.append(" = {\n");
toStringIndented(prefix + " ", tab.get(o), sb);
sb.append(prefix + "}\n");
}
} else if (obj instanceof Vector) {
Vector v = (Vector)obj;
for (Object o: v.toArray()) {
toStringIndented(prefix + " ", o, sb);
}
}
}
}