Sasl (GNU cryptographic primitives and tools)
Keywords: javax.security.sasl.Sasl,Sasl class

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## javax.security.sasl
Class Sasl

    java.lang.Object
      |
      +--javax.security.sasl.Sasl

public class Sasl
extends java.lang.Object

A static class for creating SASL clients and servers.

This class defines the policy of how to locate, load, and instantiate SASL clients and servers.

For example, an application or library gets a SASL client instance by doing something like:

    SaslClient sc =
          Sasl.createSaslClient(mechanisms, authorizationID, protocol,
                                serverName, props, callbackHandler);

It can then proceed to use the instance to create an authenticated connection.

Similarly, a server gets a SASL server instance by using code that looks as follows:

    SaslServer ss =
          Sasl.createSaslServer(mechanism, protocol, serverName, props,
                                callbackHandler);

Field Summary
`static java.lang.String` | `MAX_BUFFER` The name of a property that specifies the maximum size of the receive buffer in bytes of `SaslClient`/`SaslServer`.
`static java.lang.String` | `POLICY_FORWARD_SECRECY` The name of a property that specifies whether mechanisms that implement forward secrecy between sessions are required.
`static java.lang.String` | `POLICY_NOACTIVE` The name of a property that specifies whether mechanisms susceptible to active (non-dictionary) attacks are not permitted.
`static java.lang.String` | `POLICY_NOANONYMOUS` The name of a property that specifies whether mechanisms that accept anonymous login are not permitted.
`static java.lang.String` | `POLICY_NODICTIONARY` The name of a property that specifies whether mechanisms susceptible to passive dictionary attacks are not permitted.
`static java.lang.String` | `POLICY_NOPLAINTEXT` The name of a property that specifies whether mechanisms susceptible to simple plain passive attacks (e.g., "PLAIN") are not permitted.
`static java.lang.String` | `POLICY_PASS_CREDENTIALS` The name of a property that specifies whether mechanisms that pass client credentials are required.
`static java.lang.String` | `QOP` The name of a property that specifies the quality-of-protection to use.
`static java.lang.String` | `RAW_SEND_SIZE` The name of a property that specifies the maximum size of the raw send buffer in bytes of `SaslClient`/`SaslServer`.
`static java.lang.String` | `REUSE` The name of a property that specifies whether to reuse previously authenticated session information.
`static java.lang.String` | `SERVER_AUTH` The name of a property that specifies whether the server must authenticate to the client.
`static java.lang.String` | `STRENGTH` The name of a property that specifies the cipher strength to use.

Method Summary
`static SaslClient` | `createSaslClient(java.lang.String[] mechanisms, java.lang.String authorizationID, java.lang.String protocol, java.lang.String serverName, java.util.Map props, CallbackHandler cbh)` Creates a `SaslClient` for the specified mechanism.
`static SaslServer` | `createSaslServer(java.lang.String mechanism, java.lang.String protocol, java.lang.String serverName, java.util.Map props, CallbackHandler cbh)` Creates a `SaslServer` for the specified mechanism.
`static java.util.Enumeration` | `getSaslClientFactories()` Gets an enumeration of known factories for producing a `SaslClient` instance.
`static java.util.Enumeration` | `getSaslServerFactories()` Gets an enumeration of known factories for producing a `SaslServer` instance.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### QOP

    public static final java.lang.String QOP

  The name of a property that specifies the quality-of-protection to use. The property contains a comma-separated, ordered list of quality-of- protection values that the client or server is willing to support. A qop value is one of:

  - `"auth"` - authentication only,
  - `"auth-int"` - authentication plus integrity protection,
  - `"auth-conf"` - authentication plus integrity and confidentiality protection.

  The order of the list specifies the preference order of the client or server.

  If this property is absent, the default qop is `"auth"`.

  The value of this constant is `"javax.security.sasl.qop"`.

  See Also:
    Constant Field Values

### STRENGTH

    public static final java.lang.String STRENGTH

  The name of a property that specifies the cipher strength to use. The property contains a comma-separated, ordered list of cipher strength values that the client or server is willing to support. A strength value is one of:

  - `"low"`,
  - `"medium"`,
  - `"high"`.

  The order of the list specifies the preference order of the client or server. An implementation should allow configuration of the meaning of these values. An application may use the Java Cryptography Extension (JCE) with JCE-aware mechanisms to control the selection of cipher suites that match the strength values.

  If this property is absent, the default strength is `"high,medium,low"`.

  The value of this constant is `"javax.security.sasl.strength"`.

  See Also:
    Constant Field Values

### SERVER_AUTH

    public static final java.lang.String SERVER_AUTH

  The name of a property that specifies whether the server must authenticate to the client. The property contains `"true"` if the server must authenticate the to client; `"false"` otherwise. The default is `"false"`.

  The value of this constant is `"javax.security.sasl.server.authentication"`.

  See Also:
    Constant Field Values

### MAX_BUFFER

    public static final java.lang.String MAX_BUFFER

  The name of a property that specifies the maximum size of the receive buffer in bytes of `SaslClient`/`SaslServer`. The property contains the string representation of an integer.

  If this property is absent, the default size is defined by the mechanism.

  The value of this constant is `"javax.security.sasl.maxbuffer"`.

  See Also:
    Constant Field Values

### RAW_SEND_SIZE

    public static final java.lang.String RAW_SEND_SIZE

  The name of a property that specifies the maximum size of the raw send buffer in bytes of `SaslClient`/`SaslServer`. The property contains the string representation of an integer. The value of this property is negotiated between the client and server during the authentication exchange.

  The value of this constant is `"javax.security.sasl.rawsendsize"`.

  See Also:
    Constant Field Values

### POLICY_NOPLAINTEXT

    public static final java.lang.String POLICY_NOPLAINTEXT

  The name of a property that specifies whether mechanisms susceptible to simple plain passive attacks (e.g., "PLAIN") are not permitted. The property contains `"true"` if such mechanisms are not permitted; `"false"` if such mechanisms are permitted. The default is `"false"`.

  The value of this constant is `"javax.security.sasl.policy.noplaintext"`.

  See Also:
    Constant Field Values

### POLICY_NOACTIVE

    public static final java.lang.String POLICY_NOACTIVE

  The name of a property that specifies whether mechanisms susceptible to active (non-dictionary) attacks are not permitted. The property contains `"true"` if mechanisms susceptible to active attacks are not permitted; `"false"` if such mechanisms are permitted. The default is `"false"`.

  The value of this constant is `"javax.security.sasl.policy.noactive"`.

  See Also:
    Constant Field Values

### POLICY_NODICTIONARY

    public static final java.lang.String POLICY_NODICTIONARY

  The name of a property that specifies whether mechanisms susceptible to passive dictionary attacks are not permitted. The property contains `"true"` if mechanisms susceptible to dictionary attacks are not permitted; `"false"` if such mechanisms are permitted. The default is `"false"`.

  The value of this constant is `"javax.security.sasl.policy.nodictionary"`.

  See Also:
    Constant Field Values

### POLICY_NOANONYMOUS

    public static final java.lang.String POLICY_NOANONYMOUS

  The name of a property that specifies whether mechanisms that accept anonymous login are not permitted. The property contains `"true"` if mechanisms that accept anonymous login are not permitted; `"false"` if such mechanisms are permitted. The default is `"false"`.

  The value of this constant is `"javax.security.sasl.policy.noanonymous"`.

  See Also:
    Constant Field Values

### POLICY_FORWARD_SECRECY

    public static final java.lang.String POLICY_FORWARD_SECRECY

  The name of a property that specifies whether mechanisms that implement forward secrecy between sessions are required. Forward secrecy means that breaking into one session will not automatically provide information for breaking into future sessions. The property contains `"true"` if mechanisms that implement forward secrecy between sessions are required; `"false"` if such mechanisms are not required. The default is `"false"`.

  The value of this constant is `"javax.security.sasl.policy.forward"`.

  See Also:
    Constant Field Values

### POLICY_PASS_CREDENTIALS

    public static final java.lang.String POLICY_PASS_CREDENTIALS

  The name of a property that specifies whether mechanisms that pass client credentials are required. The property contains `"true"` if mechanisms that pass client credentials are required; `"false"` if such mechanisms are not required. The default is `"false"`.

  The value of this constant is `"javax.security.sasl.policy.credentials"`.

  See Also:
    Constant Field Values

### REUSE

    public static final java.lang.String REUSE

  The name of a property that specifies whether to reuse previously authenticated session information. The property contains `"true"` if the mechanism implementation may attempt to reuse previously authenticated session information; it contains `"false"` if the implementation must not reuse previously authenticated session information. A setting of `"true"` serves only as a hint; it does not necessarily entail actual reuse because reuse might not be possible due to a number of reasons, including, but not limited to, lack of mechanism support for reuse, expiration of reusable information, and the peer's refusal to support reuse. The property's default value is `"false"`.

  The value of this constant is `"javax.security.sasl.reuse"`. Note that all other parameters and properties required to create a SASL client/server instance must be provided regardless of whether this property has been supplied. That is, you cannot supply any less information in anticipation of reuse. Mechanism implementations that support reuse might allow customization of its implementation for factors such as cache size, timeouts, and criteria for reuseability. Such customizations are implementation-dependent.

  See Also:
    Constant Field Values

Method Detail

### createSaslClient

    public static SaslClient createSaslClient(java.lang.String[] mechanisms,
                                              java.lang.String authorizationID,
                                              java.lang.String protocol,
                                              java.lang.String serverName,
                                              java.util.Map props,
                                              CallbackHandler cbh)
                                       throws SaslException

  Creates a `SaslClient` for the specified mechanism.

  This method uses the JCA Security Provider Framework, described in the "Java Cryptography Architecture API Specification & Reference", for locating and selecting a `SaslClient` implementation.

  First, it obtains an ordered list of `SaslClientFactory` instances from the registered security providers for the `"SaslClientFactory"` service and the specified mechanism. It then invokes `createSaslClient()` on each factory instance on the list until one produces a non-null `SaslClient` instance. It returns the non-null `SaslClient` instance, or `null` if the search fails to produce a non-null `SaslClient` instance.

  A security provider for `SaslClientFactory` registers with the JCA Security Provider Framework keys of the form:

          SaslClientFactory.mechanism_name

  and values that are class names of implementations of `SaslClientFactory`.

  For example, a provider that contains a factory class, `com.wiz.sasl.digest.ClientFactory`, that supports the `"DIGEST-MD5"` mechanism would register the following entry with the JCA:

          SaslClientFactory.DIGEST-MD5     com.wiz.sasl.digest.ClientFactory

  See the "Java Cryptography Architecture API Specification & Reference" for information about how to install and configure security service providers.

  Parameters:
    `mechanisms` - the non-null list of mechanism names to try. Each is the IANA-registered name of a SASL mechanism. (e.g. "GSSAPI", "CRAM-MD5").
    `authorizationID` - the possibly `null` protocol-dependent identification to be used for authorization. If `null` or empty, the server derives an authorization ID from the client's authentication credentials. When the SASL authentication completes successfully, the specified entity is granted access.
    `protocol` - the non-null string name of the protocol for which the authentication is being performed (e.g. "ldap").
    `serverName` - the non-null fully-qualified host name of the server to authenticate to.
    `props` - the possibly null set of properties used to select the SASL mechanism and to configure the authentication exchange of the selected mechanism. For example, if props contains the `POLICY_NOPLAINTEXT` property with the value `"true"`, then the selected SASL mechanism must not be susceptible to simple plain passive attacks. In addition to the standard properties declared in this class, other, possibly mechanism-specific, properties can be included. Properties not relevant to the selected mechanism are ignored.
    `cbh` - the possibly `null` callback handler to used by the SASL mechanisms to get further information from the application/library to complete the authentication. For example, a SASL mechanism might require the authentication ID, password and realm from the caller. The authentication ID is requested by using a `NameCallback`. The password is requested by using a `PasswordCallback`. The realm is requested by using a `RealmChoiceCallback` if there is a list of realms to choose from, and by using a `RealmCallback` if the realm must be entered.
  Returns:
    a possibly `null` `SaslClient` created using the parameters supplied. If `null`, the method could not find a `SaslClientFactory` that will produce one.
  Throws:
    `SaslException` - if a `SaslClient` cannot be created because of an error.

### getSaslClientFactories

    public static java.util.Enumeration getSaslClientFactories()

  Gets an enumeration of known factories for producing a `SaslClient` instance. This method uses the same sources for locating factories as `createSaslClient()`.

  Returns:
    a non-null `Enumeration` of known factories for producing a `SaslClient` instance.
  See Also:
    `createSaslClient(String[],String,String,String,Map,CallbackHandler)`

### createSaslServer

    public static SaslServer createSaslServer(java.lang.String mechanism,
                                              java.lang.String protocol,
                                              java.lang.String serverName,
                                              java.util.Map props,
                                              CallbackHandler cbh)
                                       throws SaslException

  Creates a `SaslServer` for the specified mechanism.

  This method uses the JCA Security Provider Framework, described in the "Java Cryptography Architecture API Specification & Reference", for locating and selecting a SaslServer implementation.

  First, it obtains an ordered list of `SaslServerFactory` instances from the registered security providers for the `"SaslServerFactory"` service and the specified mechanism. It then invokes `createSaslServer()` on each factory instance on the list until one produces a non-null `SaslServer` instance. It returns the non-null `SaslServer` instance, or `null` if the search fails to produce a non-null `SaslServer` instance.

  A security provider for `SaslServerFactory` registers with the JCA Security Provider Framework keys of the form:

          SaslServerFactory.mechanism_name

  and values that are class names of implementations of `SaslServerFactory`.

  For example, a provider that contains a factory class, `com.wiz.sasl.digest.ServerFactory`, that supports the `"DIGEST-MD5"` mechanism would register the following entry with the JCA:

          SaslServerFactory.DIGEST-MD5     com.wiz.sasl.digest.ServerFactory

  See the "Java Cryptography Architecture API Specification & Reference" for information about how to install and configure security service providers.

  Parameters:
    `mechanism` - the non-null mechanism name. It must be an IANA-registered name of a SASL mechanism. (e.g. "GSSAPI", "CRAM-MD5").
    `protocol` - the non-null string name of the protocol for which the authentication is being performed (e.g. "ldap").
    `serverName` - the non-null fully qualified host name of the server.
    `props` - the possibly `null` set of properties used to select the SASL mechanism and to configure the authentication exchange of the selected mechanism. For example, if props contains the `POLICY_NOPLAINTEXT` property with the value `"true"`, then the selected SASL mechanism must not be susceptible to simple plain passive attacks. In addition to the standard properties declared in this class, other, possibly mechanism-specific, properties can be included. Properties not relevant to the selected mechanism are ignored.
    `cbh` - the possibly `null` callback handler to used by the SASL mechanisms to get further information from the application/library to complete the authentication. For example, a SASL mechanism might require the authentication ID, password and realm from the caller. The authentication ID is requested by using a `NameCallback`. The password is requested by using a `PasswordCallback`. The realm is requested by using a `RealmChoiceCallback` if there is a list of realms to choose from, and by using a `RealmCallback` if the realm must be entered.
  Returns:
    a possibly `null` `SaslServer` created using the parameters supplied. If `null`, the method cannot find a `SaslServerFactory` instance that will produce one.
  Throws:
    `SaslException` - if a `SaslServer` instance cannot be created because of an error.

### getSaslServerFactories

    public static java.util.Enumeration getSaslServerFactories()

  Gets an enumeration of known factories for producing a `SaslServer` instance. This method uses the same sources for locating factories as `createSaslServer()`.

  Returns:
    a non-null `Enumeration` of known factories for producing a `SaslServer` instance.
  See Also:
    `createSaslServer(String,String,String,Map,CallbackHandler)`

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| For the latest news and information visit The GNU Crypto project
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