Class ObjectInputFilter.Config

Method Details

• getSerialFilter

  public static ObjectInputFilter getSerialFilter()

  Returns the static JVM-wide deserialization filter or null if not configured.

  Returns:

  the static JVM-wide deserialization filter or null if not configured

  Throws:

  IllegalStateException - if the initialization of the filter from the system property jdk.serialFilter or the security property jdk.serialFilter fails.

• setSerialFilter

  public static void setSerialFilter(ObjectInputFilter filter)

  Set the static JVM-wide filter if it has not already been configured or set.

  Parameters:

  filter - the deserialization filter to set as the JVM-wide filter; not null

  Throws:

  SecurityException - if there is security manager and the SerializablePermission("serialFilter") is not granted

  IllegalStateException - if the filter has already been set or the initialization of the filter from the system property jdk.serialFilter or the security property jdk.serialFilter fails.

• getSerialFilterFactory

  public static BinaryOperator<ObjectInputFilter> getSerialFilterFactory()

  Returns the JVM-wide deserialization filter factory. If the filter factory has been set it is returned, otherwise, a builtin deserialization filter factory is returned. The filter factory provides a filter for every ObjectInputStream when invoked from ObjectInputStream constructors and when a stream-specific filter is set with setObjectInputFilter.

  Implementation Requirements:

  The builtin deserialization filter factory provides the static JVM-wide filter when invoked from ObjectInputStream constructors. When invoked to set the stream-specific filter the requested filter replaces the static JVM-wide filter, unless it has already been set. The builtin deserialization filter factory implements the behavior of earlier versions of setting the initial filter in the ObjectInputStream constructor and ObjectInputStream.setObjectInputFilter(java.io.ObjectInputFilter).

  Returns:

  the JVM-wide deserialization filter factory; non-null

  Throws:

  IllegalStateException - if the filter factory initialization is incomplete

  Since:

  17

• setSerialFilterFactory

  public static void setSerialFilterFactory(BinaryOperator<ObjectInputFilter> filterFactory)

  Set the JVM-wide deserialization filter factory. The filter factory can be configured exactly once with one of: setting the jdk.serialFilterFactory property on the command line, setting the jdk.serialFilterFactory property in the Security file, or using this setSerialFilterFactory method. The filter factory can be set only before any ObjectInputStream has been created to avoid any inconsistency in which filter factory is being used.

  The JVM-wide filter factory is invoked when an ObjectInputStream is constructed and when the stream-specific filter is set. The parameters are the current filter and a requested filter and it returns the filter to be used for the stream. If the current filter is non-null, the filter factory must return a non-null filter; this is to prevent unintentional disabling of filtering after it has been enabled. The factory determines the filter to be used for ObjectInputStream streams based on its inputs, any other filters, context, or state that is available. The factory may throw runtime exceptions to signal incorrect use or invalid parameters. See the filter models for examples of composition and delegation.

  Parameters:

  filterFactory - the deserialization filter factory to set as the JVM-wide filter factory; not null

  Throws:

  IllegalStateException - if the builtin deserialization filter factory has already been replaced or any instance of ObjectInputStream has been created.

  SecurityException - if there is security manager and the SerializablePermission("serialFilter") is not granted

  Since:

  17

• createFilter

  public static ObjectInputFilter createFilter(String pattern)

  Returns an ObjectInputFilter from a string of patterns.

  Patterns are separated by ";" (semicolon). Whitespace is significant and is considered part of the pattern. If a pattern includes an equals assignment, "=" it sets a limit. If a limit appears more than once the last value is used.

  • maxdepth=value - the maximum depth of a graph
  • maxrefs=value - the maximum number of internal references
  • maxbytes=value - the maximum number of bytes in the input stream
  • maxarray=value - the maximum array length allowed

  Other patterns match or reject class or package name as returned from Class.getName() and if an optional module name is present class.getModule().getName(). Note that for arrays the element type is used in the pattern, not the array type.

  • If the pattern starts with "!", the class is rejected if the remaining pattern is matched; otherwise the class is allowed if the pattern matches.
  • If the pattern contains "/", the non-empty prefix up to the "/" is the module name; if the module name matches the module name of the class then the remaining pattern is matched with the class name. If there is no "/", the module name is not compared.
  • If the pattern ends with ".**" it matches any class in the package and all subpackages.
  • If the pattern ends with ".*" it matches any class in the package.
  • If the pattern ends with "*", it matches any class with the pattern as a prefix.
  • If the pattern is equal to the class name, it matches.
  • Otherwise, the pattern is not matched.

  The resulting filter performs the limit checks and then tries to match the class, if any. If any of the limits are exceeded, the filter returns Status.REJECTED. If the class is an array type, the class to be matched is the element type. Arrays of any number of dimensions are treated the same as the element type. For example, a pattern of "!example.Foo", rejects creation of any instance or array of example.Foo. The first pattern that matches, working from left to right, determines the Status.ALLOWED or Status.REJECTED result. If the limits are not exceeded and no pattern matches the class, the result is Status.UNDECIDED.

  Parameters:

  pattern - the pattern string to parse; not null

  Returns:

  a filter to check a class being deserialized; null if no patterns

  Throws:

  IllegalArgumentException - if the pattern string is illegal or malformed and cannot be parsed. In particular, if any of the following is true:

  • if a limit is missing the name or the name is not one of "maxdepth", "maxrefs", "maxbytes", or "maxarray"
  • if the value of the limit can not be parsed by Long.parseLong or is negative
  • if the pattern contains "/" and the module name is missing or the remaining pattern is empty
  • if the package is missing for ".*" and ".**"