| /* |
| * Copyright (c) 1997, 2009, 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 java.io; |
| |
| import java.security.*; |
| import java.util.Enumeration; |
| import java.util.List; |
| import java.util.ArrayList; |
| import java.util.Vector; |
| import java.util.Collections; |
| import java.io.ObjectStreamField; |
| import java.io.ObjectOutputStream; |
| import java.io.ObjectInputStream; |
| import java.io.IOException; |
| import sun.security.util.SecurityConstants; |
| |
| /** |
| * This class represents access to a file or directory. A FilePermission consists |
| * of a pathname and a set of actions valid for that pathname. |
| * <P> |
| * Pathname is the pathname of the file or directory granted the specified |
| * actions. A pathname that ends in "/*" (where "/" is |
| * the file separator character, <code>File.separatorChar</code>) indicates |
| * all the files and directories contained in that directory. A pathname |
| * that ends with "/-" indicates (recursively) all files |
| * and subdirectories contained in that directory. A pathname consisting of |
| * the special token "<<ALL FILES>>" matches <b>any</b> file. |
| * <P> |
| * Note: A pathname consisting of a single "*" indicates all the files |
| * in the current directory, while a pathname consisting of a single "-" |
| * indicates all the files in the current directory and |
| * (recursively) all files and subdirectories contained in the current |
| * directory. |
| * <P> |
| * The actions to be granted are passed to the constructor in a string containing |
| * a list of one or more comma-separated keywords. The possible keywords are |
| * "read", "write", "execute", "delete", and "readlink". Their meaning is |
| * defined as follows: |
| * <P> |
| * <DL> |
| * <DT> read <DD> read permission |
| * <DT> write <DD> write permission |
| * <DT> execute |
| * <DD> execute permission. Allows <code>Runtime.exec</code> to |
| * be called. Corresponds to <code>SecurityManager.checkExec</code>. |
| * <DT> delete |
| * <DD> delete permission. Allows <code>File.delete</code> to |
| * be called. Corresponds to <code>SecurityManager.checkDelete</code>. |
| * <DT> readlink |
| * <DD> read link permission. Allows the target of a |
| * <a href="../nio/file/package-summary.html#links">symbolic link</a> |
| * to be read by invoking the {@link java.nio.file.Path#readSymbolicLink |
| * readSymbolicLink } method. |
| * </DL> |
| * <P> |
| * The actions string is converted to lowercase before processing. |
| * <P> |
| * Be careful when granting FilePermissions. Think about the implications |
| * of granting read and especially write access to various files and |
| * directories. The "<<ALL FILES>>" permission with write action is |
| * especially dangerous. This grants permission to write to the entire |
| * file system. One thing this effectively allows is replacement of the |
| * system binary, including the JVM runtime environment. |
| * |
| * <p>Please note: Code can always read a file from the same |
| * directory it's in (or a subdirectory of that directory); it does not |
| * need explicit permission to do so. |
| * |
| * @see java.security.Permission |
| * @see java.security.Permissions |
| * @see java.security.PermissionCollection |
| * |
| * |
| * @author Marianne Mueller |
| * @author Roland Schemers |
| * @since 1.2 |
| * |
| * @serial exclude |
| */ |
| |
| public final class FilePermission extends Permission implements Serializable { |
| |
| /** |
| * Execute action. |
| */ |
| private final static int EXECUTE = 0x1; |
| /** |
| * Write action. |
| */ |
| private final static int WRITE = 0x2; |
| /** |
| * Read action. |
| */ |
| private final static int READ = 0x4; |
| /** |
| * Delete action. |
| */ |
| private final static int DELETE = 0x8; |
| /** |
| * Read link action. |
| */ |
| private final static int READLINK = 0x10; |
| |
| /** |
| * All actions (read,write,execute,delete,readlink) |
| */ |
| private final static int ALL = READ|WRITE|EXECUTE|DELETE|READLINK; |
| /** |
| * No actions. |
| */ |
| private final static int NONE = 0x0; |
| |
| // the actions mask |
| private transient int mask; |
| |
| // does path indicate a directory? (wildcard or recursive) |
| private transient boolean directory; |
| |
| // is it a recursive directory specification? |
| private transient boolean recursive; |
| |
| /** |
| * the actions string. |
| * |
| * @serial |
| */ |
| private String actions; // Left null as long as possible, then |
| // created and re-used in the getAction function. |
| |
| // canonicalized dir path. In the case of |
| // directories, it is the name "/blah/*" or "/blah/-" without |
| // the last character (the "*" or "-"). |
| |
| private transient String cpath; |
| |
| // static Strings used by init(int mask) |
| private static final char RECURSIVE_CHAR = '-'; |
| private static final char WILD_CHAR = '*'; |
| |
| /* |
| public String toString() |
| { |
| StringBuffer sb = new StringBuffer(); |
| sb.append("***\n"); |
| sb.append("cpath = "+cpath+"\n"); |
| sb.append("mask = "+mask+"\n"); |
| sb.append("actions = "+getActions()+"\n"); |
| sb.append("directory = "+directory+"\n"); |
| sb.append("recursive = "+recursive+"\n"); |
| sb.append("***\n"); |
| return sb.toString(); |
| } |
| */ |
| |
| private static final long serialVersionUID = 7930732926638008763L; |
| |
| /** |
| * initialize a FilePermission object. Common to all constructors. |
| * Also called during de-serialization. |
| * |
| * @param mask the actions mask to use. |
| * |
| */ |
| private void init(int mask) |
| { |
| |
| if ((mask & ALL) != mask) |
| throw new IllegalArgumentException("invalid actions mask"); |
| |
| if (mask == NONE) |
| throw new IllegalArgumentException("invalid actions mask"); |
| |
| if ((cpath = getName()) == null) |
| throw new NullPointerException("name can't be null"); |
| |
| this.mask = mask; |
| |
| if (cpath.equals("<<ALL FILES>>")) { |
| directory = true; |
| recursive = true; |
| cpath = ""; |
| return; |
| } |
| |
| // store only the canonical cpath if possible |
| cpath = AccessController.doPrivileged(new PrivilegedAction<String>() { |
| public String run() { |
| try { |
| String path = cpath; |
| if (cpath.endsWith("*")) { |
| // call getCanonicalPath with a path with wildcard character |
| // replaced to avoid calling it with paths that are |
| // intended to match all entries in a directory |
| path = path.substring(0, path.length()-1) + "-"; |
| path = new File(path).getCanonicalPath(); |
| return path.substring(0, path.length()-1) + "*"; |
| } else { |
| return new File(path).getCanonicalPath(); |
| } |
| } catch (IOException ioe) { |
| return cpath; |
| } |
| } |
| }); |
| |
| int len = cpath.length(); |
| char last = ((len > 0) ? cpath.charAt(len - 1) : 0); |
| |
| if (last == RECURSIVE_CHAR && |
| cpath.charAt(len - 2) == File.separatorChar) { |
| directory = true; |
| recursive = true; |
| cpath = cpath.substring(0, --len); |
| } else if (last == WILD_CHAR && |
| cpath.charAt(len - 2) == File.separatorChar) { |
| directory = true; |
| //recursive = false; |
| cpath = cpath.substring(0, --len); |
| } else { |
| // overkill since they are initialized to false, but |
| // commented out here to remind us... |
| //directory = false; |
| //recursive = false; |
| } |
| |
| // XXX: at this point the path should be absolute. die if it isn't? |
| } |
| |
| /** |
| * Creates a new FilePermission object with the specified actions. |
| * <i>path</i> is the pathname of a file or directory, and <i>actions</i> |
| * contains a comma-separated list of the desired actions granted on the |
| * file or directory. Possible actions are |
| * "read", "write", "execute", "delete", and "readlink". |
| * |
| * <p>A pathname that ends in "/*" (where "/" is |
| * the file separator character, <code>File.separatorChar</code>) |
| * indicates all the files and directories contained in that directory. |
| * A pathname that ends with "/-" indicates (recursively) all files and |
| * subdirectories contained in that directory. The special pathname |
| * "<<ALL FILES>>" matches any file. |
| * |
| * <p>A pathname consisting of a single "*" indicates all the files |
| * in the current directory, while a pathname consisting of a single "-" |
| * indicates all the files in the current directory and |
| * (recursively) all files and subdirectories contained in the current |
| * directory. |
| * |
| * <p>A pathname containing an empty string represents an empty path. |
| * |
| * @param path the pathname of the file/directory. |
| * @param actions the action string. |
| * |
| * @throws IllegalArgumentException |
| * If actions is <code>null</code>, empty or contains an action |
| * other than the specified possible actions. |
| */ |
| |
| public FilePermission(String path, String actions) |
| { |
| super(path); |
| init(getMask(actions)); |
| } |
| |
| /** |
| * Creates a new FilePermission object using an action mask. |
| * More efficient than the FilePermission(String, String) constructor. |
| * Can be used from within |
| * code that needs to create a FilePermission object to pass into the |
| * <code>implies</code> method. |
| * |
| * @param path the pathname of the file/directory. |
| * @param mask the action mask to use. |
| */ |
| |
| // package private for use by the FilePermissionCollection add method |
| FilePermission(String path, int mask) |
| { |
| super(path); |
| init(mask); |
| } |
| |
| /** |
| * Checks if this FilePermission object "implies" the specified permission. |
| * <P> |
| * More specifically, this method returns true if:<p> |
| * <ul> |
| * <li> <i>p</i> is an instanceof FilePermission,<p> |
| * <li> <i>p</i>'s actions are a proper subset of this |
| * object's actions, and <p> |
| * <li> <i>p</i>'s pathname is implied by this object's |
| * pathname. For example, "/tmp/*" implies "/tmp/foo", since |
| * "/tmp/*" encompasses all files in the "/tmp" directory, |
| * including the one named "foo". |
| * </ul> |
| * |
| * @param p the permission to check against. |
| * |
| * @return <code>true</code> if the specified permission is not |
| * <code>null</code> and is implied by this object, |
| * <code>false</code> otherwise. |
| */ |
| public boolean implies(Permission p) { |
| if (!(p instanceof FilePermission)) |
| return false; |
| |
| FilePermission that = (FilePermission) p; |
| |
| // we get the effective mask. i.e., the "and" of this and that. |
| // They must be equal to that.mask for implies to return true. |
| |
| return ((this.mask & that.mask) == that.mask) && impliesIgnoreMask(that); |
| } |
| |
| /** |
| * Checks if the Permission's actions are a proper subset of the |
| * this object's actions. Returns the effective mask iff the |
| * this FilePermission's path also implies that FilePermission's path. |
| * |
| * @param that the FilePermission to check against. |
| * @param exact return immediately if the masks are not equal |
| * @return the effective mask |
| */ |
| boolean impliesIgnoreMask(FilePermission that) { |
| if (this.directory) { |
| if (this.recursive) { |
| // make sure that.path is longer then path so |
| // something like /foo/- does not imply /foo |
| if (that.directory) { |
| return (that.cpath.length() >= this.cpath.length()) && |
| that.cpath.startsWith(this.cpath); |
| } else { |
| return ((that.cpath.length() > this.cpath.length()) && |
| that.cpath.startsWith(this.cpath)); |
| } |
| } else { |
| if (that.directory) { |
| // if the permission passed in is a directory |
| // specification, make sure that a non-recursive |
| // permission (i.e., this object) can't imply a recursive |
| // permission. |
| if (that.recursive) |
| return false; |
| else |
| return (this.cpath.equals(that.cpath)); |
| } else { |
| int last = that.cpath.lastIndexOf(File.separatorChar); |
| if (last == -1) |
| return false; |
| else { |
| // this.cpath.equals(that.cpath.substring(0, last+1)); |
| // Use regionMatches to avoid creating new string |
| return (this.cpath.length() == (last + 1)) && |
| this.cpath.regionMatches(0, that.cpath, 0, last+1); |
| } |
| } |
| } |
| } else if (that.directory) { |
| // if this is NOT recursive/wildcarded, |
| // do not let it imply a recursive/wildcarded permission |
| return false; |
| } else { |
| return (this.cpath.equals(that.cpath)); |
| } |
| } |
| |
| /** |
| * Checks two FilePermission objects for equality. Checks that <i>obj</i> is |
| * a FilePermission, and has the same pathname and actions as this object. |
| * <P> |
| * @param obj the object we are testing for equality with this object. |
| * @return <code>true</code> if obj is a FilePermission, and has the same |
| * pathname and actions as this FilePermission object, |
| * <code>false</code> otherwise. |
| */ |
| public boolean equals(Object obj) { |
| if (obj == this) |
| return true; |
| |
| if (! (obj instanceof FilePermission)) |
| return false; |
| |
| FilePermission that = (FilePermission) obj; |
| |
| return (this.mask == that.mask) && |
| this.cpath.equals(that.cpath) && |
| (this.directory == that.directory) && |
| (this.recursive == that.recursive); |
| } |
| |
| /** |
| * Returns the hash code value for this object. |
| * |
| * @return a hash code value for this object. |
| */ |
| |
| public int hashCode() { |
| return this.cpath.hashCode(); |
| } |
| |
| /** |
| * Converts an actions String to an actions mask. |
| * |
| * @param action the action string. |
| * @return the actions mask. |
| */ |
| private static int getMask(String actions) { |
| |
| int mask = NONE; |
| |
| // Null action valid? |
| if (actions == null) { |
| return mask; |
| } |
| // Check against use of constants (used heavily within the JDK) |
| if (actions == SecurityConstants.FILE_READ_ACTION) { |
| return READ; |
| } else if (actions == SecurityConstants.FILE_WRITE_ACTION) { |
| return WRITE; |
| } else if (actions == SecurityConstants.FILE_EXECUTE_ACTION) { |
| return EXECUTE; |
| } else if (actions == SecurityConstants.FILE_DELETE_ACTION) { |
| return DELETE; |
| } else if (actions == SecurityConstants.FILE_READLINK_ACTION) { |
| return READLINK; |
| } |
| |
| char[] a = actions.toCharArray(); |
| |
| int i = a.length - 1; |
| if (i < 0) |
| return mask; |
| |
| while (i != -1) { |
| char c; |
| |
| // skip whitespace |
| while ((i!=-1) && ((c = a[i]) == ' ' || |
| c == '\r' || |
| c == '\n' || |
| c == '\f' || |
| c == '\t')) |
| i--; |
| |
| // check for the known strings |
| int matchlen; |
| |
| if (i >= 3 && (a[i-3] == 'r' || a[i-3] == 'R') && |
| (a[i-2] == 'e' || a[i-2] == 'E') && |
| (a[i-1] == 'a' || a[i-1] == 'A') && |
| (a[i] == 'd' || a[i] == 'D')) |
| { |
| matchlen = 4; |
| mask |= READ; |
| |
| } else if (i >= 4 && (a[i-4] == 'w' || a[i-4] == 'W') && |
| (a[i-3] == 'r' || a[i-3] == 'R') && |
| (a[i-2] == 'i' || a[i-2] == 'I') && |
| (a[i-1] == 't' || a[i-1] == 'T') && |
| (a[i] == 'e' || a[i] == 'E')) |
| { |
| matchlen = 5; |
| mask |= WRITE; |
| |
| } else if (i >= 6 && (a[i-6] == 'e' || a[i-6] == 'E') && |
| (a[i-5] == 'x' || a[i-5] == 'X') && |
| (a[i-4] == 'e' || a[i-4] == 'E') && |
| (a[i-3] == 'c' || a[i-3] == 'C') && |
| (a[i-2] == 'u' || a[i-2] == 'U') && |
| (a[i-1] == 't' || a[i-1] == 'T') && |
| (a[i] == 'e' || a[i] == 'E')) |
| { |
| matchlen = 7; |
| mask |= EXECUTE; |
| |
| } else if (i >= 5 && (a[i-5] == 'd' || a[i-5] == 'D') && |
| (a[i-4] == 'e' || a[i-4] == 'E') && |
| (a[i-3] == 'l' || a[i-3] == 'L') && |
| (a[i-2] == 'e' || a[i-2] == 'E') && |
| (a[i-1] == 't' || a[i-1] == 'T') && |
| (a[i] == 'e' || a[i] == 'E')) |
| { |
| matchlen = 6; |
| mask |= DELETE; |
| |
| } else if (i >= 7 && (a[i-7] == 'r' || a[i-7] == 'R') && |
| (a[i-6] == 'e' || a[i-6] == 'E') && |
| (a[i-5] == 'a' || a[i-5] == 'A') && |
| (a[i-4] == 'd' || a[i-4] == 'D') && |
| (a[i-3] == 'l' || a[i-3] == 'L') && |
| (a[i-2] == 'i' || a[i-2] == 'I') && |
| (a[i-1] == 'n' || a[i-1] == 'N') && |
| (a[i] == 'k' || a[i] == 'K')) |
| { |
| matchlen = 8; |
| mask |= READLINK; |
| |
| } else { |
| // parse error |
| throw new IllegalArgumentException( |
| "invalid permission: " + actions); |
| } |
| |
| // make sure we didn't just match the tail of a word |
| // like "ackbarfaccept". Also, skip to the comma. |
| boolean seencomma = false; |
| while (i >= matchlen && !seencomma) { |
| switch(a[i-matchlen]) { |
| case ',': |
| seencomma = true; |
| /*FALLTHROUGH*/ |
| case ' ': case '\r': case '\n': |
| case '\f': case '\t': |
| break; |
| default: |
| throw new IllegalArgumentException( |
| "invalid permission: " + actions); |
| } |
| i--; |
| } |
| |
| // point i at the location of the comma minus one (or -1). |
| i -= matchlen; |
| } |
| |
| return mask; |
| } |
| |
| /** |
| * Return the current action mask. Used by the FilePermissionCollection. |
| * |
| * @return the actions mask. |
| */ |
| |
| int getMask() { |
| return mask; |
| } |
| |
| /** |
| * Return the canonical string representation of the actions. |
| * Always returns present actions in the following order: |
| * read, write, execute, delete, readlink. |
| * |
| * @return the canonical string representation of the actions. |
| */ |
| private static String getActions(int mask) |
| { |
| StringBuilder sb = new StringBuilder(); |
| boolean comma = false; |
| |
| if ((mask & READ) == READ) { |
| comma = true; |
| sb.append("read"); |
| } |
| |
| if ((mask & WRITE) == WRITE) { |
| if (comma) sb.append(','); |
| else comma = true; |
| sb.append("write"); |
| } |
| |
| if ((mask & EXECUTE) == EXECUTE) { |
| if (comma) sb.append(','); |
| else comma = true; |
| sb.append("execute"); |
| } |
| |
| if ((mask & DELETE) == DELETE) { |
| if (comma) sb.append(','); |
| else comma = true; |
| sb.append("delete"); |
| } |
| |
| if ((mask & READLINK) == READLINK) { |
| if (comma) sb.append(','); |
| else comma = true; |
| sb.append("readlink"); |
| } |
| |
| return sb.toString(); |
| } |
| |
| /** |
| * Returns the "canonical string representation" of the actions. |
| * That is, this method always returns present actions in the following order: |
| * read, write, execute, delete, readlink. For example, if this FilePermission |
| * object allows both write and read actions, a call to <code>getActions</code> |
| * will return the string "read,write". |
| * |
| * @return the canonical string representation of the actions. |
| */ |
| public String getActions() |
| { |
| if (actions == null) |
| actions = getActions(this.mask); |
| |
| return actions; |
| } |
| |
| |
| /** |
| * Returns a new PermissionCollection object for storing FilePermission |
| * objects. |
| * <p> |
| * FilePermission objects must be stored in a manner that allows them |
| * to be inserted into the collection in any order, but that also enables the |
| * PermissionCollection <code>implies</code> |
| * method to be implemented in an efficient (and consistent) manner. |
| * |
| * <p>For example, if you have two FilePermissions: |
| * <OL> |
| * <LI> <code>"/tmp/-", "read"</code> |
| * <LI> <code>"/tmp/scratch/foo", "write"</code> |
| * </OL> |
| * |
| * <p>and you are calling the <code>implies</code> method with the FilePermission: |
| * |
| * <pre> |
| * "/tmp/scratch/foo", "read,write", |
| * </pre> |
| * |
| * then the <code>implies</code> function must |
| * take into account both the "/tmp/-" and "/tmp/scratch/foo" |
| * permissions, so the effective permission is "read,write", |
| * and <code>implies</code> returns true. The "implies" semantics for |
| * FilePermissions are handled properly by the PermissionCollection object |
| * returned by this <code>newPermissionCollection</code> method. |
| * |
| * @return a new PermissionCollection object suitable for storing |
| * FilePermissions. |
| */ |
| |
| public PermissionCollection newPermissionCollection() { |
| return new FilePermissionCollection(); |
| } |
| |
| /** |
| * WriteObject is called to save the state of the FilePermission |
| * to a stream. The actions are serialized, and the superclass |
| * takes care of the name. |
| */ |
| private void writeObject(ObjectOutputStream s) |
| throws IOException |
| { |
| // Write out the actions. The superclass takes care of the name |
| // call getActions to make sure actions field is initialized |
| if (actions == null) |
| getActions(); |
| s.defaultWriteObject(); |
| } |
| |
| /** |
| * readObject is called to restore the state of the FilePermission from |
| * a stream. |
| */ |
| private void readObject(ObjectInputStream s) |
| throws IOException, ClassNotFoundException |
| { |
| // Read in the actions, then restore everything else by calling init. |
| s.defaultReadObject(); |
| init(getMask(actions)); |
| } |
| } |
| |
| /** |
| * A FilePermissionCollection stores a set of FilePermission permissions. |
| * FilePermission objects |
| * must be stored in a manner that allows them to be inserted in any |
| * order, but enable the implies function to evaluate the implies |
| * method. |
| * For example, if you have two FilePermissions: |
| * <OL> |
| * <LI> "/tmp/-", "read" |
| * <LI> "/tmp/scratch/foo", "write" |
| * </OL> |
| * And you are calling the implies function with the FilePermission: |
| * "/tmp/scratch/foo", "read,write", then the implies function must |
| * take into account both the /tmp/- and /tmp/scratch/foo |
| * permissions, so the effective permission is "read,write". |
| * |
| * @see java.security.Permission |
| * @see java.security.Permissions |
| * @see java.security.PermissionCollection |
| * |
| * |
| * @author Marianne Mueller |
| * @author Roland Schemers |
| * |
| * @serial include |
| * |
| */ |
| |
| final class FilePermissionCollection extends PermissionCollection |
| implements Serializable { |
| |
| // Not serialized; see serialization section at end of class |
| private transient List<Permission> perms; |
| |
| /** |
| * Create an empty FilePermissions object. |
| * |
| */ |
| |
| public FilePermissionCollection() { |
| perms = new ArrayList<Permission>(); |
| } |
| |
| /** |
| * Adds a permission to the FilePermissions. The key for the hash is |
| * permission.path. |
| * |
| * @param permission the Permission object to add. |
| * |
| * @exception IllegalArgumentException - if the permission is not a |
| * FilePermission |
| * |
| * @exception SecurityException - if this FilePermissionCollection object |
| * has been marked readonly |
| */ |
| |
| public void add(Permission permission) |
| { |
| if (! (permission instanceof FilePermission)) |
| throw new IllegalArgumentException("invalid permission: "+ |
| permission); |
| if (isReadOnly()) |
| throw new SecurityException( |
| "attempt to add a Permission to a readonly PermissionCollection"); |
| |
| synchronized (this) { |
| perms.add(permission); |
| } |
| } |
| |
| /** |
| * Check and see if this set of permissions implies the permissions |
| * expressed in "permission". |
| * |
| * @param p the Permission object to compare |
| * |
| * @return true if "permission" is a proper subset of a permission in |
| * the set, false if not. |
| */ |
| |
| public boolean implies(Permission permission) |
| { |
| if (! (permission instanceof FilePermission)) |
| return false; |
| |
| FilePermission fp = (FilePermission) permission; |
| |
| int desired = fp.getMask(); |
| int effective = 0; |
| int needed = desired; |
| |
| synchronized (this) { |
| int len = perms.size(); |
| for (int i = 0; i < len; i++) { |
| FilePermission x = (FilePermission) perms.get(i); |
| if (((needed & x.getMask()) != 0) && x.impliesIgnoreMask(fp)) { |
| effective |= x.getMask(); |
| if ((effective & desired) == desired) |
| return true; |
| needed = (desired ^ effective); |
| } |
| } |
| } |
| return false; |
| } |
| |
| /** |
| * Returns an enumeration of all the FilePermission objects in the |
| * container. |
| * |
| * @return an enumeration of all the FilePermission objects. |
| */ |
| |
| public Enumeration elements() { |
| // Convert Iterator into Enumeration |
| synchronized (this) { |
| return Collections.enumeration(perms); |
| } |
| } |
| |
| private static final long serialVersionUID = 2202956749081564585L; |
| |
| // Need to maintain serialization interoperability with earlier releases, |
| // which had the serializable field: |
| // private Vector permissions; |
| |
| /** |
| * @serialField permissions java.util.Vector |
| * A list of FilePermission objects. |
| */ |
| private static final ObjectStreamField[] serialPersistentFields = { |
| new ObjectStreamField("permissions", Vector.class), |
| }; |
| |
| /** |
| * @serialData "permissions" field (a Vector containing the FilePermissions). |
| */ |
| /* |
| * Writes the contents of the perms field out as a Vector for |
| * serialization compatibility with earlier releases. |
| */ |
| private void writeObject(ObjectOutputStream out) throws IOException { |
| // Don't call out.defaultWriteObject() |
| |
| // Write out Vector |
| Vector<Permission> permissions = new Vector<Permission>(perms.size()); |
| synchronized (this) { |
| permissions.addAll(perms); |
| } |
| |
| ObjectOutputStream.PutField pfields = out.putFields(); |
| pfields.put("permissions", permissions); |
| out.writeFields(); |
| } |
| |
| /* |
| * Reads in a Vector of FilePermissions and saves them in the perms field. |
| */ |
| @SuppressWarnings("unchecked") |
| private void readObject(ObjectInputStream in) throws IOException, |
| ClassNotFoundException { |
| // Don't call defaultReadObject() |
| |
| // Read in serialized fields |
| ObjectInputStream.GetField gfields = in.readFields(); |
| |
| // Get the one we want |
| Vector<Permission> permissions = (Vector<Permission>)gfields.get("permissions", null); |
| perms = new ArrayList<Permission>(permissions.size()); |
| perms.addAll(permissions); |
| } |
| } |
