java/12 : java.base/sun/security/provider/ConfigFile.java

ConfigFile
https://openjdk.java.net/
GPLv2 + Classpath Exception
/*
 * 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
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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 javax.security.auth.login.Configuration.  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 Configuration object is: 


  Loop through the security properties,
  login.config.url.1, login.config.url.2, ...,
  login.config.url.X. Each property value specifies a URL pointing to a login configuration file to be loaded. Read in and load each configuration. 
 The java.lang.System property java.security.auth.login.config may also be set to a 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, policy.allowSystemProperty is set to true),
  also load that login configuration.

  If the java.security.auth.login.config property is defined using
  "==" (rather than "="), then ignore all other specified
  login configurations and only load this configuration.

  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.

 The configuration syntax supported by this implementation is exactly that syntax specified in the javax.security.auth.login.Configuration class. 
See Also: LoginContext
security properties/**
 * 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 static final 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 ConfigurationSpi object. 
Throws: SecurityException – if the ConfigurationSpi can not be initialized/**
         * 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 ConfigurationSpi object from the specified URI. 
Params: uri – the URI
Throws: SecurityException – if the ConfigurationSpi can not be initialized
NullPointerException – if uri is null/**
         * 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
SecurityException – if the caller does not have permission
                          to initialize the Configuration/**
         * 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.getAuthResourceString
                    ("Configuration.Error.No.such.file.or.directory"));
            }
        }

        Retrieve an entry from the Configuration using an application name
as an index.
Params: applicationName – the name used to index the Configuration.
Returns: an array of AppConfigurationEntries which correspond to
        the stacked configuration of LoginModules for this
        application, or null if this application has no configured
        LoginModules./**
         * 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./**
         * 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.",
                        linenum, expect, st.sval);
                }
                break;

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

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

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

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

            default:
                throw ioException(
                    "Configuration.Error.Line.line.expected.expect.found.value.",
                    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().isEmpty()) {  // 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.isEmpty()) {
                throw ioException(
                    "Configuration.Error.Line.line.system.property.value.expanded.to.empty.value",
                    linenum, value);
            }
            return s;
        }

        private IOException ioException(String resourceKey, Object... args) {
            MessageFormat form = new MessageFormat(
                ResourcesMgr.getAuthResourceString(resourceKey));
            return new IOException(form.format(args));
        }
    }
}
Params:	uri – the `URI`
Throws:	SecurityException – if the `ConfigurationSpi` can not be initialized NullPointerException – if `uri` is null
Params:	applicationName – the name used to index the Configuration.
Returns:	an array of AppConfigurationEntries which correspond to the stacked configuration of LoginModules for this application, or null if this application has no configured LoginModules.
/

java/ 12/ java.base/sun/security/provider/ConfigFile.java
