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The SSL messages are sent in the following order:. Client hello The client sends the server information including the highest version of SSL that it supports and a list of the cipher suites that it supports (TLS 1.0 is indicated as SSL 3.1).
The cipher suite information includes cryptographic algorithms and key sizes. Web social networks. Server hello The server chooses the highest version of SSL and the best cipher suite that both the client and server support and sends this information to the client. The server sends the client a certificate or a certificate chain. A certificate chain typically begins with the server's public key certificate and ends with the certificate authority's root certificate. This message is optional, but is used whenever server authentication is required. If the server must authenticate the client, then it sends the client a certificate request. In Internet applications, this message is rarely sent.
Server key exchange (optional) The server sends the client a server key exchange message if the public key information from the is not sufficient for key exchange. For example, in cipher suites based on Diffie-Hellman (DH), this message contains the server's DH public key. Server hello done The server tells the client that it is finished with its initial negotiation messages. Certificate (optional) If the server from the client, the client sends its certificate chain, just as the server did previously. Note: Only a few Internet server applications ask for a certificate from the client.
Client key exchange The client generates information used to create a key to use for symmetric encryption. For RSA, the client then encrypts this key information with the server's public key and sends it to the server. For cipher suites based on DH, this message contains the client's DH public key. Certificate verify (optional) This message is sent by the client when the client presents a certificate as previously explained. Its purpose is to allow the server to complete the process of authenticating the client. When this message is used, the client sends information that it digitally signs using a cryptographic hash function. When the server decrypts this information with the client's public key, the server is able to authenticate the client.
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Change cipher spec The client sends a message telling the server to change to encrypted mode. Finished The client tells the server that it is ready for secure data communication to begin. Change cipher spec The server sends a message telling the client to change to encrypted mode. Finished The server tells the client that it is ready for secure data communication to begin.
This is the end of the SSL handshake. Encrypted data The client and the server communicate using the symmetric encryption algorithm and the cryptographic hash function negotiated during the client hello and server hello, and using the secret key that the client sent to the server during the client key exchange. The handshake can be renegotiated at this time. See the next section for details. Close Messages At the end of the connection, each side sends a closenotify message to inform the peer that the connection is closed. If the parameters generated during an SSL session are saved, then these parameters can sometimes be reused for future SSL sessions.
Saving SSL session parameters allows encrypted communication to begin much more quickly. Handshaking Again (Renegotiation) Once the initial handshake is finished and application data is flowing, either side is free to initiate a new handshake at any time. An application might like to use a stronger cipher suite for especially critical operations, or a server application might want to require client authentication. Regardless of the reason, the new handshake takes place over the existing encrypted session, and application data and handshake messages are interleaved until a new session is established. Your application can initiate a new handshake by using one of the following methods:. SSLSocket.startHandshake.
SSLEngine.beginHandshake Note that a protocol flaw related to renegotiation was found in 2009. The protocol and the Java SE implementation have both been fixed. For more information, see. The define a specific series of steps to ensure a protected connection.
However, the choice of cipher suite directly affects the type of security that the connection enjoys. For example, if an anonymous cipher suite is selected, then the application has no way to verify the remote peer's identity. If a suite with no encryption is selected, then the privacy of the data cannot be protected. Additionally, the SSL/TLS protocols do not specify that the credentials received must match those that peer might be expected to send.
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If the connection were somehow redirected to a rogue peer, but the rogue's credentials were acceptable based on the current trust material, then the connection would be considered valid. When using raw SSLSocket and SSLEngine classes, you should always check the peer's credentials before sending any data. The SSLSocket and SSLEngine classes do not automatically verify that the host name in a URL matches the host name in the peer's credentials. An application could be exploited with URL spoofing if the host name is not verified. Protocols such as HTTPS do require host name verification. Applications can use to override the default HTTPS host name rules. See for more information.
To communicate securely, both sides of the connection must be SSL-enabled. In the JSSE API, the endpoint classes of the connection are SSLSocket and SSLEngine. In, the major classes used to create SSLSocket and SSLEngine are laid out in a logical ordering. The text following the diagram, explains the contents of the illustration. An SSLSocket is created either by an SSLSocketFactory or by an SSLServerSocket accepting an inbound connection.
In turn, an SSLServerSocket is created by an SSLServerSocketFactory. Both SSLSocketFactory and SSLServerSocketFactory objects are created by an SSLContext. An SSLEngine is created directly by an SSLContext, and relies on the application to handle all I/O. Note: When using raw SSLSocket or SSLEngine classes, you should always check the peer's credentials before sending any data. The SSLSocket and SSLEngine classes do not automatically verify, for example, that the host name in a URL matches the host name in the peer's credentials. An application could be exploited with URL spoofing if the host name is not verified. There are two ways to obtain and initialize an SSLContext:.
The simplest way is to call the static getDefault method on either the SSLSocketFactory or SSLServerSocketFactory class. This method creates a default SSLContext with a default KeyManager, TrustManager, and SecureRandom (a secure random number generator). A default KeyManagerFactory and TrustManagerFactory are used to create the KeyManager and TrustManager, respectively. The key material used is found in the default keystore and truststore, as determined by system properties described in.
The approach that gives the caller the most control over the behavior of the created context is to call the static method getInstance on the SSLContext class, and then initialize the context by calling the instance's proper init method. One variant of the init method takes three arguments: an array of KeyManager objects, an array of TrustManager objects, and a SecureRandom object. The KeyManager and TrustManager objects are created by either implementing the appropriate interfaces or using the KeyManagerFactory and TrustManagerFactory classes to generate implementations. The KeyManagerFactory and TrustManagerFactory can then each be initialized with key material contained in the KeyStore passed as an argument to the init method of the TrustManagerFactory or KeyManagerFactory classes. Finally, the getTrustManagers method (in TrustManagerFactory) and getKeyManagers method (in KeyManagerFactory) can be called to obtain the array of trust managers or key managers, one for each type of trust or key material. Once an SSL connection is established, an SSLSession is created which contains various information, such as identities established and cipher suite used. The SSLSession is then used to describe an ongoing relationship and state information between two entities.
Each SSL connection involves one session at a time, but that session may be used on many connections between those entities, simultaneously or sequentially. The core JSSE classes are part of the javax.net and javax.net.ssl packages. The abstract javax.net.SocketFactory class is used to create sockets. Subclasses of this class are factories that create particular subclasses of sockets and thus provide a general framework for the addition of public socket-level functionality.
For example, see. The abstract javax.net.ServerSocketFactory class is analogous to the SocketFactory class, but is used specifically for creating server sockets. Socket factories are a simple way to capture a variety of policies related to the sockets being constructed, producing such sockets in a way that does not require special configuration of the code that asks for the sockets:.
Due to polymorphism of both factories and sockets, different kinds of sockets can be used by the same application code just by passing different kinds of factories. Factories can themselves be customized with parameters used in socket construction. For example, factories could be customized to return sockets with different networking timeouts or security parameters already configured. The sockets returned to the application can be subclasses of java.net.Socket (or javax.net.ssl.SSLSocket), so that they can directly expose new APIs for features such as compression, security, record marking, statistics collection, or firewall tunneling.
The javax.net.ssl.SSLSocketFactory class acts as a factory for creating secure sockets. This class is an abstract subclass of. Secure socket factories encapsulate the details of creating and initially configuring secure sockets. This includes authentication keys, peer certificate validation, enabled cipher suites, and the like. The javax.net.ssl.SSLServerSocketFactory class is analogous to the SSLSocketFactory class, but is used specifically for creating server sockets. Obtaining an SSLSocketFactory The following ways can be used to obtain an SSLSocketFactory:. Get the default factory by calling the SSLSocketFactory.getDefault static method.
Receive a factory as an API parameter. That is, code that must create sockets but does not care about the details of how the sockets are configured can include a method with an SSLSocketFactory parameter that can be called by clients to specify which SSLSocketFactory to use when creating sockets (for example, javax.net.ssl.HttpsURLConnection). Construct a new factory with specifically configured behavior. The default factory is typically configured to support server authentication only so that sockets created by the default factory do not leak any more information about the client than a normal TCP socket would. Many classes that create and use sockets do not need to know the details of socket creation behavior. Creating sockets through a socket factory passed in as a parameter is a good way of isolating the details of socket configuration, and increases the reusability of classes that create and use sockets. You can create new socket factory instances either by implementing your own socket factory subclass or by using another class which acts as a factory for socket factories.
One example of such a class is SSLContext, which is provided with the JSSE implementation as a provider-based configuration class. The javax.net.ssl.SSLSocket class is a subclass of the standard Java java.net.Socket class. It supports all of the standard socket methods and adds methods specific to secure sockets. Instances of this class encapsulate the under which they were created. There are APIs to control the creation of secure socket sessions for a socket instance, but trust and key management are not directly exposed. The javax.net.ssl.SSLServerSocket class is analogous to the SSLSocket class, but is used specifically for creating server sockets.
To prevent peer spoofing, you should always presented to an SSLSocket. Note: Due to the complexity of the SSL and TLS protocols, it is difficult to predict whether incoming bytes on a connection are handshake or application data, and how that data might affect the current connection state (even causing the process to block). In the Oracle JSSE implementation, the available method on the object obtained by SSLSocket.getInputStream returns a count of the number of application data bytes successfully decrypted from the SSL connection but not yet read by the application. Obtaining an SSLSocket Instances of SSLSocket can be obtained in one of the following ways:.
An SSLSocket can be created by an instance of via one of the several createSocket methods of that class. An SSLSocket can be created through the accept method of the SSLServerSocket class. SSL/TLS is becoming increasingly popular. It is being used in a wide variety of applications across a wide range of computing platforms and devices.
Along with this popularity come demands to use SSL/TLS with different I/O and threading models to satisfy the applications' performance, scalability, footprint, and other requirements. There are demands to use SSL/TLS with blocking and nonblocking I/O channels, asynchronous I/O, arbitrary input and output streams, and byte buffers. There are demands to use it in highly scalable, performance-critical environments, requiring management of thousands of network connections. Abstraction of the I/O transport mechanism using the SSLEngine class in Java SE allows applications to use the SSL/TLS protocols in a transport-independent way, and thus frees application developers to choose transport and computing models that best meet their needs. Not only does this abstraction allow applications to use nonblocking I/O channels and other I/O models, it also accommodates different threading models. This effectively leaves the I/O and threading decisions up to the application developer. Because of this flexibility, the application developer must manage I/O and threading (complex topics in and of themselves), as well as have some understanding of the SSL/TLS protocols.
The abstraction is therefore an advanced API: beginners should use SSLSocket. Users of other Java programming language APIs such as the Java Generic Security Services (Java GSS) and the Java Simple Authentication Security Layer (Java SASL) will notice similarities in that the application is also responsible for transporting data. The core class is. It encapsulates an SSL/TLS state machine and operates on inbound and outbound byte buffers supplied by the user of the SSLEngine class. The diagram in illustrates the flow of data from the application, through SSLEngine, to the transport mechanism, and back.
The application, shown on the left, supplies application (plaintext) data in an application buffer and passes it to SSLEngine. The SSLEngine object processes the data contained in the buffer, or any handshaking data, to produce SSL/TLS encoded data and places it to the network buffer supplied by the application. The application is then responsible for using an appropriate transport (shown on the right) to send the contents of the network buffer to its peer. Upon receiving SSL/TLS encoded data from its peer (via the transport), the application places the data into a network buffer and passes it to SSLEngine. The SSLEngine object processes the network buffer's contents to produce handshaking data or application data. An instance of the SSLEngine class can be in one of the following states:.
Creation: Ready to be configured. Initial handshaking: Perform authentication and negotiate communication parameters.
Application data: Ready for application exchange. Rehandshaking: Renegotiate communications parameters/authentication; handshaking data may be mixed with application data. Closure: Ready to shut down the connection Creating an SSLEngine Object To create an SSLEngine object, you use the SSLContext.createSSLEngine method. You must configure the engine to act as a client or a server, and set other configuration parameters, such as which cipher suites to use and whether to require client authentication.
Illustrates how to create an SSLEngine object. Note: The server name and port number are not used for communicating with the server (all transport is the responsibility of the application). They are hints to the JSSE provider to use for SSL session caching, and for Kerberos-based cipher suite implementations to determine which server credentials should be obtained.