Package org.apache.catalina.realm

Class DigestCredentialHandlerBase

java.lang.Object
org.apache.catalina.realm.DigestCredentialHandlerBase
All Implemented Interfaces:
CredentialHandler
Direct Known Subclasses:
MessageDigestCredentialHandler, SecretKeyCredentialHandler
public abstract class DigestCredentialHandlerBase extends Object implements CredentialHandler
Base implementation for the Tomcat provided CredentialHandlers.

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    static final int
    DEFAULT_SALT_LENGTH
     
    protected static final StringManager
    sm
     

  • Constructor Summary

    Constructors
    Constructor
    Description
    DigestCredentialHandlerBase()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    static boolean
    equals(byte[] b1, byte[] b2)
    Implements byte-array equality which always compares all bytes in the array, without stopping early if any bytes do not match.
    static boolean
    equals(String s1, String s2, boolean ignoreCase)
    Implements String equality which always compares all characters in the string, without stopping early if any characters do not match.
    abstract String
    getAlgorithm()
     
    protected abstract int
    getDefaultIterations()
     
    protected int
    getDefaultSaltLength()
     
    int
    getIterations()
     
    protected abstract Log
    getLog()
     
    boolean
    getLogInvalidStoredCredentials()
    When checking input credentials against stored credentials will a warning message be logged if invalid stored credentials are discovered?
    int
    getSaltLength()
     
    protected boolean
    matchesSaltIterationsEncoded(String inputCredentials, String storedCredentials)
    Checks whether the provided credential matches the stored credential when the stored credential is in the form salt$iteration-count$credential
    String
    mutate(String userCredential)
    Generates the equivalent stored credentials for the given input credentials.
    protected abstract String
    mutate(String inputCredentials, byte[] salt, int iterations)
    Generates the equivalent stored credentials for the given input credentials, salt and iterations.
    protected String
    mutate(String inputCredentials, byte[] salt, int iterations, int keyLength)
    Generates the equivalent stored credentials for the given input credentials, salt, iterations and key length.
    abstract void
    setAlgorithm(String algorithm)
    Set the algorithm used to convert input credentials to stored credentials.
    void
    setIterations(int iterations)
    Set the number of iterations of the associated algorithm that will be used when creating a new stored credential for a given input credential.
    void
    setLogInvalidStoredCredentials(boolean logInvalidStoredCredentials)
    Set whether a warning message will be logged if invalid stored credentials are discovered while checking input credentials against stored credentials?
    void
    setSaltLength(int saltLength)
    Set the salt length that will be used when creating a new stored credential for a given input credential.

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    Methods inherited from interface org.apache.catalina.CredentialHandler

    matches

  • Field Details

  • Constructor Details

    • DigestCredentialHandlerBase

      public DigestCredentialHandlerBase()

  • Method Details

    • getIterations

      public int getIterations()
      Returns:
      the number of iterations of the associated algorithm that will be used when creating a new stored credential for a given input credential.

    • setIterations

      public void setIterations(int iterations)
      Set the number of iterations of the associated algorithm that will be used when creating a new stored credential for a given input credential.
      Parameters:
      iterations - the iterations count

    • getSaltLength

      public int getSaltLength()
      Returns:
      the salt length that will be used when creating a new stored credential for a given input credential.

    • setSaltLength

      public void setSaltLength(int saltLength)
      Set the salt length that will be used when creating a new stored credential for a given input credential.
      Parameters:
      saltLength - the salt length

    • getLogInvalidStoredCredentials

      public boolean getLogInvalidStoredCredentials()
      When checking input credentials against stored credentials will a warning message be logged if invalid stored credentials are discovered?
      Returns:
      true if logging will occur

    • setLogInvalidStoredCredentials

      public void setLogInvalidStoredCredentials(boolean logInvalidStoredCredentials)
      Set whether a warning message will be logged if invalid stored credentials are discovered while checking input credentials against stored credentials?
      Parameters:
      logInvalidStoredCredentials - true to log, the default value is false

    • mutate

      public String mutate(String userCredential)
      Description copied from interface: CredentialHandler
      Generates the equivalent stored credentials for the given input credentials.
      Specified by:
      mutate in interface CredentialHandler
      Parameters:
      userCredential - User provided credentials
      Returns:
      The equivalent stored credentials for the given input credentials

    • matchesSaltIterationsEncoded

      protected boolean matchesSaltIterationsEncoded(String inputCredentials, String storedCredentials)
      Checks whether the provided credential matches the stored credential when the stored credential is in the form salt$iteration-count$credential
      Parameters:
      inputCredentials - The input credential
      storedCredentials - The stored credential
      Returns:
      true if they match, otherwise false

    • getDefaultSaltLength

      protected int getDefaultSaltLength()
      Returns:
      the default salt length used by the CredentialHandler.

    • mutate

      protected abstract String mutate(String inputCredentials, byte[] salt, int iterations)
      Generates the equivalent stored credentials for the given input credentials, salt and iterations. If the algorithm requires a key length, the default will be used.
      Parameters:
      inputCredentials - User provided credentials
      salt - Salt, if any
      iterations - Number of iterations of the algorithm associated with this CredentialHandler applied to the inputCredentials to generate the equivalent stored credentials
      Returns:
      The equivalent stored credentials for the given input credentials or null if the generation fails

    • mutate

      protected String mutate(String inputCredentials, byte[] salt, int iterations, int keyLength)
      Generates the equivalent stored credentials for the given input credentials, salt, iterations and key length. The default implementation calls ignores the key length and calls mutate(String, byte[], int). Sub-classes that use the key length should override this method.
      Parameters:
      inputCredentials - User provided credentials
      salt - Salt, if any
      iterations - Number of iterations of the algorithm associated with this CredentialHandler applied to the inputCredentials to generate the equivalent stored credentials
      keyLength - Length of the produced digest in bits for implementations where it's applicable
      Returns:
      The equivalent stored credentials for the given input credentials or null if the generation fails

    • setAlgorithm

      public abstract void setAlgorithm(String algorithm) throws NoSuchAlgorithmException
      Set the algorithm used to convert input credentials to stored credentials.
      Parameters:
      algorithm - the algorithm
      Throws:
      NoSuchAlgorithmException - if the specified algorithm is not supported

    • getAlgorithm

      public abstract String getAlgorithm()
      Returns:
      the algorithm used to convert input credentials to stored credentials.

    • getDefaultIterations

      protected abstract int getDefaultIterations()
      Returns:
      the default number of iterations used by the CredentialHandler.

    • getLog

      protected abstract Log getLog()
      Returns:
      the logger for the CredentialHandler instance.

    • equals

      public static boolean equals(String s1, String s2, boolean ignoreCase)
      Implements String equality which always compares all characters in the string, without stopping early if any characters do not match.

      Note: This implementation was adapted from MessageDigest.isEqual(byte[], byte[]) which we assume is as optimizer-defeating as possible.

      Parameters:
      s1 - The first string to compare.
      s2 - The second string to compare.
      ignoreCase - true if the strings should be compared without regard to case. Note that "true" here is only guaranteed to work with plain ASCII characters.
      Returns:
      true if the strings are equal to each other, false otherwise.

    • equals

      public static boolean equals(byte[] b1, byte[] b2)
      Implements byte-array equality which always compares all bytes in the array, without stopping early if any bytes do not match.

      Note: Implementation note: this method delegates to MessageDigest.isEqual(byte[], byte[]) under the assumption that it provides a constant-time comparison of the bytes in the arrays. Java 7+ has such an implementation, but neither the Javadoc nor any specification requires it. Therefore, Tomcat should continue to use this method internally in case the JDK implementation changes so this method can be re-implemented properly.

      Parameters:
      b1 - The first array to compare.
      b2 - The second array to compare.
      Returns:
      true if the arrays are equal to each other, false otherwise.