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java/org/apache/catalina/startup/PasswdUserDatabase.java

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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.catalina.startup;
+
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.util.Enumeration;
+import java.util.Hashtable;
+
+import org.apache.juli.logging.Log;
+import org.apache.juli.logging.LogFactory;
+import org.apache.naming.StringManager;
+
+/**
+ * Concrete implementation of the <code>UserDatabase</code> interface
+ * that processes the <code>/etc/passwd</code> file on a Unix system.
+ *
+ * @author Craig R. McClanahan
+ */
+public final class PasswdUserDatabase implements UserDatabase {
+
+    private static final Log log = LogFactory.getLog(PasswdUserDatabase.class);
+    private static final StringManager sm = StringManager.getManager(PasswdUserDatabase.class);
+
+    /**
+     * The pathname of the Unix password file.
+     */
+    private static final String PASSWORD_FILE = "/etc/passwd";
+
+
+    /**
+     * The set of home directories for all defined users, keyed by username.
+     */
+    private final Hashtable<String,String> homes = new Hashtable<>();
+
+
+    /**
+     * The UserConfig listener with which we are associated.
+     */
+    private UserConfig userConfig = null;
+
+
+    /**
+     * Return the UserConfig listener with which we are associated.
+     */
+    @Override
+    public UserConfig getUserConfig() {
+        return userConfig;
+    }
+
+
+    /**
+     * Set the UserConfig listener with which we are associated.
+     *
+     * @param userConfig The new UserConfig listener
+     */
+    @Override
+    public void setUserConfig(UserConfig userConfig) {
+        this.userConfig = userConfig;
+        init();
+    }
+
+
+    /**
+     * Return an absolute pathname to the home directory for the specified user.
+     *
+     * @param user User for which a home directory should be retrieved
+     */
+    @Override
+    public String getHome(String user) {
+        return homes.get(user);
+    }
+
+
+    /**
+     * Return an enumeration of the usernames defined on this server.
+     */
+    @Override
+    public Enumeration<String> getUsers() {
+        return homes.keys();
+    }
+
+
+    /**
+     * Initialize our set of users and home directories.
+     */
+    private void init() {
+        try (BufferedReader reader = new BufferedReader(new FileReader(PASSWORD_FILE))) {
+            String line = reader.readLine();
+            while (line != null) {
+                String tokens[] = line.split(":");
+                // Need non-zero 1st and 6th tokens
+                if (tokens.length > 5 && tokens[0].length() > 0 && tokens[5].length() > 0) {
+                    // Add this user and corresponding directory
+                    homes.put(tokens[0], tokens[5]);
+                }
+                line = reader.readLine();
+            }
+        } catch (Exception e) {
+            log.warn(sm.getString("passwdUserDatabase.readFail"), e);
+        }
+    }
+}