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	/*
	* Copyright (c) 2000, 2014, 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.
	*/

	package sun.security.provider;

	import java.io.*;
	import java.net.MalformedURLException;
	import java.net.URI;
	import java.net.URL;
	import java.security.AccessController;
	import java.security.PrivilegedAction;
	import java.security.PrivilegedActionException;
	import java.security.PrivilegedExceptionAction;
	import java.security.Security;
	import java.security.URIParameter;
	import java.text.MessageFormat;
	import java.util.*;
	import javax.security.auth.AuthPermission;
	import javax.security.auth.login.AppConfigurationEntry;
	import javax.security.auth.login.AppConfigurationEntry.LoginModuleControlFlag;
	import javax.security.auth.login.Configuration;
	import javax.security.auth.login.ConfigurationSpi;
	import sun.security.util.Debug;
	import sun.security.util.PropertyExpander;
	import sun.security.util.ResourcesMgr;

	/**
	* This class represents a default implementation for
	* {@code javax.security.auth.login.Configuration}.
	*
	* <p> This object stores the runtime login configuration representation,
	* and is the amalgamation of multiple static login configurations that
	* resides in files. The algorithm for locating the login configuration
	* file(s) and reading their information into this {@code Configuration}
	* object is:
	*
	* <ol>
	* <li>
	* Loop through the security properties,
	* <i>login.config.url.1</i>, <i>login.config.url.2</i>, ...,
	* <i>login.config.url.X</i>.
	* Each property value specifies a {@code URL} pointing to a
	* login configuration file to be loaded. Read in and load
	* each configuration.
	*
	* <li>
	* The {@code java.lang.System} property
	* <i>java.security.auth.login.config</i>
	* may also be set to a {@code URL} pointing to another
	* login configuration file
	* (which is the case when a user uses the -D switch at runtime).
	* If this property is defined, and its use is allowed by the
	* security property file (the Security property,
	* <i>policy.allowSystemProperty</i> is set to <i>true</i>),
	* also load that login configuration.
	*
	* <li>
	* If the <i>java.security.auth.login.config</i> property is defined using
	* "==" (rather than "="), then ignore all other specified
	* login configurations and only load this configuration.
	*
	* <li>
	* If no system or security properties were set, try to read from the file,
	* ${user.home}/.java.login.config, where ${user.home} is the value
	* represented by the "user.home" System property.
	* </ol>
	*
	* <p> The configuration syntax supported by this implementation
	* is exactly that syntax specified in the
	* {@code javax.security.auth.login.Configuration} class.
	*
	* @see javax.security.auth.login.LoginContext
	* @see java.security.Security security properties
	*/
	public final class ConfigFile extends Configuration {

	private final Spi spi;

	public ConfigFile() {
	spi = new Spi();
	}

	@Override
	public AppConfigurationEntry[] getAppConfigurationEntry(String appName) {
	return spi.engineGetAppConfigurationEntry(appName);
	}

	@Override
	public synchronized void refresh() {
	spi.engineRefresh();
	}

	public final static class Spi extends ConfigurationSpi {

	private URL url;
	private boolean expandProp = true;
	private Map<String, List<AppConfigurationEntry>> configuration;
	private int linenum;
	private StreamTokenizer st;
	private int lookahead;

	private static Debug debugConfig = Debug.getInstance("configfile");
	private static Debug debugParser = Debug.getInstance("configparser");

	/**
	* Creates a new {@code ConfigurationSpi} object.
	*
	* @throws SecurityException if the {@code ConfigurationSpi} can not be
	* initialized
	*/
	public Spi() {
	try {
	init();
	} catch (IOException ioe) {
	throw new SecurityException(ioe);
	}
	}

	/**
	* Creates a new {@code ConfigurationSpi} object from the specified
	* {@code URI}.
	*
	* @param uri the {@code URI}
	* @throws SecurityException if the {@code ConfigurationSpi} can not be
	* initialized
	* @throws NullPointerException if {@code uri} is null
	*/
	public Spi(URI uri) {
	// only load config from the specified URI
	try {
	url = uri.toURL();
	init();
	} catch (IOException ioe) {
	throw new SecurityException(ioe);
	}
	}

	public Spi(final Configuration.Parameters params) throws IOException {

	// call in a doPrivileged
	//
	// we have already passed the Configuration.getInstance
	// security check. also this class is not freely accessible
	// (it is in the "sun" package).

	try {
	AccessController.doPrivileged(new PrivilegedExceptionAction<Void>() {
	public Void run() throws IOException {
	if (params == null) {
	init();
	} else {
	if (!(params instanceof URIParameter)) {
	throw new IllegalArgumentException
	("Unrecognized parameter: " + params);
	}
	URIParameter uriParam = (URIParameter)params;
	url = uriParam.getURI().toURL();
	init();
	}
	return null;
	}
	});
	} catch (PrivilegedActionException pae) {
	throw (IOException)pae.getException();
	}

	// if init() throws some other RuntimeException,
	// let it percolate up naturally.
	}

	/**
	* Read and initialize the entire login Configuration from the
	* configured URL.
	*
	* @throws IOException if the Configuration can not be initialized
	* @throws SecurityException if the caller does not have permission
	* to initialize the Configuration
	*/
	private void init() throws IOException {

	boolean initialized = false;

	// For policy.expandProperties, check if either a security or system
	// property is set to false (old code erroneously checked the system
	// prop so we must check both to preserve compatibility).
	String expand = Security.getProperty("policy.expandProperties");
	if (expand == null) {
	expand = System.getProperty("policy.expandProperties");
	}
	if ("false".equals(expand)) {
	expandProp = false;
	}

	// new configuration
	Map<String, List<AppConfigurationEntry>> newConfig = new HashMap<>();

	if (url != null) {
	/**
	* If the caller specified a URI via Configuration.getInstance,
	* we only read from that URI
	*/
	if (debugConfig != null) {
	debugConfig.println("reading " + url);
	}
	init(url, newConfig);
	configuration = newConfig;
	return;
	}

	/**
	* Caller did not specify URI via Configuration.getInstance.
	* Read from URLs listed in the java.security properties file.
	*/
	String allowSys = Security.getProperty("policy.allowSystemProperty");

	if ("true".equalsIgnoreCase(allowSys)) {
	String extra_config = System.getProperty
	("java.security.auth.login.config");
	if (extra_config != null) {
	boolean overrideAll = false;
	if (extra_config.startsWith("=")) {
	overrideAll = true;
	extra_config = extra_config.substring(1);
	}
	try {
	extra_config = PropertyExpander.expand(extra_config);
	} catch (PropertyExpander.ExpandException peee) {
	throw ioException("Unable.to.properly.expand.config",
	extra_config);
	}

	URL configURL = null;
	try {
	configURL = new URL(extra_config);
	} catch (MalformedURLException mue) {
	File configFile = new File(extra_config);
	if (configFile.exists()) {
	configURL = configFile.toURI().toURL();
	} else {
	throw ioException(
	"extra.config.No.such.file.or.directory.",
	extra_config);
	}
	}

	if (debugConfig != null) {
	debugConfig.println("reading "+configURL);
	}
	init(configURL, newConfig);
	initialized = true;
	if (overrideAll) {
	if (debugConfig != null) {
	debugConfig.println("overriding other policies!");
	}
	configuration = newConfig;
	return;
	}
	}
	}

	int n = 1;
	String config_url;
	while ((config_url = Security.getProperty
	("login.config.url."+n)) != null) {
	try {
	config_url = PropertyExpander.expand
	(config_url).replace(File.separatorChar, '/');
	if (debugConfig != null) {
	debugConfig.println("\tReading config: " + config_url);
	}
	init(new URL(config_url), newConfig);
	initialized = true;
	} catch (PropertyExpander.ExpandException peee) {
	throw ioException("Unable.to.properly.expand.config",
	config_url);
	}
	n++;
	}

	if (initialized == false && n == 1 && config_url == null) {

	// get the config from the user's home directory
	if (debugConfig != null) {
	debugConfig.println("\tReading Policy " +
	"from ~/.java.login.config");
	}
	config_url = System.getProperty("user.home");
	String userConfigFile = config_url + File.separatorChar +
	".java.login.config";

	// No longer throws an exception when there's no config file
	// at all. Returns an empty Configuration instead.
	if (new File(userConfigFile).exists()) {
	init(new File(userConfigFile).toURI().toURL(), newConfig);
	}
	}

	configuration = newConfig;
	}

	private void init(URL config,
	Map<String, List<AppConfigurationEntry>> newConfig)
	throws IOException {

	try (InputStreamReader isr
	= new InputStreamReader(getInputStream(config), "UTF-8")) {
	readConfig(isr, newConfig);
	} catch (FileNotFoundException fnfe) {
	if (debugConfig != null) {
	debugConfig.println(fnfe.toString());
	}
	throw new IOException(ResourcesMgr.getString
	("Configuration.Error.No.such.file.or.directory",
	"sun.security.util.AuthResources"));
	}
	}

	/**
	* Retrieve an entry from the Configuration using an application name
	* as an index.
	*
	* @param applicationName the name used to index the Configuration.
	* @return an array of AppConfigurationEntries which correspond to
	* the stacked configuration of LoginModules for this
	* application, or null if this application has no configured
	* LoginModules.
	*/
	@Override
	public AppConfigurationEntry[] engineGetAppConfigurationEntry
	(String applicationName) {

	List<AppConfigurationEntry> list = null;
	synchronized (configuration) {
	list = configuration.get(applicationName);
	}

	if (list == null \|\| list.size() == 0) {
	return null;
	}

	AppConfigurationEntry[] entries =
	new AppConfigurationEntry[list.size()];
	Iterator<AppConfigurationEntry> iterator = list.iterator();
	for (int i = 0; iterator.hasNext(); i++) {
	AppConfigurationEntry e = iterator.next();
	entries[i] = new AppConfigurationEntry(e.getLoginModuleName(),
	e.getControlFlag(),
	e.getOptions());
	}
	return entries;
	}

	/**
	* Refresh and reload the Configuration by re-reading all of the
	* login configurations.
	*
	* @throws SecurityException if the caller does not have permission
	* to refresh the Configuration.
	*/
	@Override
	public synchronized void engineRefresh() {

	SecurityManager sm = System.getSecurityManager();
	if (sm != null) {
	sm.checkPermission(
	new AuthPermission("refreshLoginConfiguration"));
	}

	AccessController.doPrivileged(new PrivilegedAction<Void>() {
	public Void run() {
	try {
	init();
	} catch (IOException ioe) {
	throw new SecurityException(ioe.getLocalizedMessage(),
	ioe);
	}
	return null;
	}
	});
	}

	private void readConfig(Reader reader,
	Map<String, List<AppConfigurationEntry>> newConfig)
	throws IOException {

	linenum = 1;

	if (!(reader instanceof BufferedReader)) {
	reader = new BufferedReader(reader);
	}

	st = new StreamTokenizer(reader);
	st.quoteChar('"');
	st.wordChars('$', '$');
	st.wordChars('_', '_');
	st.wordChars('-', '-');
	st.wordChars('', '');
	st.lowerCaseMode(false);
	st.slashSlashComments(true);
	st.slashStarComments(true);
	st.eolIsSignificant(true);

	lookahead = nextToken();
	while (lookahead != StreamTokenizer.TT_EOF) {
	parseLoginEntry(newConfig);
	}
	}

	private void parseLoginEntry(
	Map<String, List<AppConfigurationEntry>> newConfig)
	throws IOException {

	List<AppConfigurationEntry> configEntries = new LinkedList<>();

	// application name
	String appName = st.sval;
	lookahead = nextToken();

	if (debugParser != null) {
	debugParser.println("\tReading next config entry: " + appName);
	}

	match("{");

	// get the modules
	while (peek("}") == false) {
	// get the module class name
	String moduleClass = match("module class name");

	// controlFlag (required, optional, etc)
	LoginModuleControlFlag controlFlag;
	String sflag = match("controlFlag").toUpperCase(Locale.ENGLISH);
	switch (sflag) {
	case "REQUIRED":
	controlFlag = LoginModuleControlFlag.REQUIRED;
	break;
	case "REQUISITE":
	controlFlag = LoginModuleControlFlag.REQUISITE;
	break;
	case "SUFFICIENT":
	controlFlag = LoginModuleControlFlag.SUFFICIENT;
	break;
	case "OPTIONAL":
	controlFlag = LoginModuleControlFlag.OPTIONAL;
	break;
	default:
	throw ioException(
	"Configuration.Error.Invalid.control.flag.flag",
	sflag);
	}

	// get the args
	Map<String, String> options = new HashMap<>();
	while (peek(";") == false) {
	String key = match("option key");
	match("=");
	try {
	options.put(key, expand(match("option value")));
	} catch (PropertyExpander.ExpandException peee) {
	throw new IOException(peee.getLocalizedMessage());
	}
	}

	lookahead = nextToken();

	// create the new element
	if (debugParser != null) {
	debugParser.println("\t\t" + moduleClass + ", " + sflag);
	for (String key : options.keySet()) {
	debugParser.println("\t\t\t" + key +
	"=" + options.get(key));
	}
	}
	configEntries.add(new AppConfigurationEntry(moduleClass,
	controlFlag,
	options));
	}

	match("}");
	match(";");

	// add this configuration entry
	if (newConfig.containsKey(appName)) {
	throw ioException(
	"Configuration.Error.Can.not.specify.multiple.entries.for.appName",
	appName);
	}
	newConfig.put(appName, configEntries);
	}

	private String match(String expect) throws IOException {

	String value = null;

	switch(lookahead) {
	case StreamTokenizer.TT_EOF:
	throw ioException(
	"Configuration.Error.expected.expect.read.end.of.file.",
	expect);

	case '"':
	case StreamTokenizer.TT_WORD:
	if (expect.equalsIgnoreCase("module class name") \|\|
	expect.equalsIgnoreCase("controlFlag") \|\|
	expect.equalsIgnoreCase("option key") \|\|
	expect.equalsIgnoreCase("option value")) {
	value = st.sval;
	lookahead = nextToken();
	} else {
	throw ioException(
	"Configuration.Error.Line.line.expected.expect.found.value.",
	new Integer(linenum), expect, st.sval);
	}
	break;

	case '{':
	if (expect.equalsIgnoreCase("{")) {
	lookahead = nextToken();
	} else {
	throw ioException(
	"Configuration.Error.Line.line.expected.expect.",
	new Integer(linenum), expect, st.sval);
	}
	break;

	case ';':
	if (expect.equalsIgnoreCase(";")) {
	lookahead = nextToken();
	} else {
	throw ioException(
	"Configuration.Error.Line.line.expected.expect.",
	new Integer(linenum), expect, st.sval);
	}
	break;

	case '}':
	if (expect.equalsIgnoreCase("}")) {
	lookahead = nextToken();
	} else {
	throw ioException(
	"Configuration.Error.Line.line.expected.expect.",
	new Integer(linenum), expect, st.sval);
	}
	break;

	case '=':
	if (expect.equalsIgnoreCase("=")) {
	lookahead = nextToken();
	} else {
	throw ioException(
	"Configuration.Error.Line.line.expected.expect.",
	new Integer(linenum), expect, st.sval);
	}
	break;

	default:
	throw ioException(
	"Configuration.Error.Line.line.expected.expect.found.value.",
	new Integer(linenum), expect, st.sval);
	}
	return value;
	}

	private boolean peek(String expect) {
	switch (lookahead) {
	case ',':
	return expect.equalsIgnoreCase(",");
	case ';':
	return expect.equalsIgnoreCase(";");
	case '{':
	return expect.equalsIgnoreCase("{");
	case '}':
	return expect.equalsIgnoreCase("}");
	default:
	return false;
	}
	}

	private int nextToken() throws IOException {
	int tok;
	while ((tok = st.nextToken()) == StreamTokenizer.TT_EOL) {
	linenum++;
	}
	return tok;
	}

	private InputStream getInputStream(URL url) throws IOException {
	if ("file".equalsIgnoreCase(url.getProtocol())) {
	// Compatibility notes:
	//
	// Code changed from
	// String path = url.getFile().replace('/', File.separatorChar);
	// return new FileInputStream(path);
	//
	// The original implementation would search for "/tmp/a%20b"
	// when url is "file:///tmp/a%20b". This is incorrect. The
	// current codes fix this bug and searches for "/tmp/a b".
	// For compatibility reasons, when the file "/tmp/a b" does
	// not exist, the file named "/tmp/a%20b" will be tried.
	//
	// This also means that if both file exists, the behavior of
	// this method is changed, and the current codes choose the
	// correct one.
	try {
	return url.openStream();
	} catch (Exception e) {
	String file = url.getPath();
	if (url.getHost().length() > 0) { // For Windows UNC
	file = "//" + url.getHost() + file;
	}
	if (debugConfig != null) {
	debugConfig.println("cannot read " + url +
	", try " + file);
	}
	return new FileInputStream(file);
	}
	} else {
	return url.openStream();
	}
	}

	private String expand(String value)
	throws PropertyExpander.ExpandException, IOException {

	if (value.isEmpty()) {
	return value;
	}

	if (!expandProp) {
	return value;
	}
	String s = PropertyExpander.expand(value);
	if (s == null \|\| s.length() == 0) {
	throw ioException(
	"Configuration.Error.Line.line.system.property.value.expanded.to.empty.value",
	new Integer(linenum), value);
	}
	return s;
	}

	private IOException ioException(String resourceKey, Object... args) {
	MessageFormat form = new MessageFormat(ResourcesMgr.getString
	(resourceKey, "sun.security.util.AuthResources"));
	return new IOException(form.format(args));
	}
	}
	}

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