Application security
When you use the Microsoft JDBC Driver for SQL Server, it's important to take precautions to ensure the security of your application. The following sections provide information about steps you can take to help secure your application.
Using Java policy permissions
When you use the Microsoft JDBC Driver for SQL Server, it's important to specify the required Java policy permissions that the JDBC driver requires. The Java Runtime Environment (JRE) provides an extensive security model. That model can be used at runtime to determine whether a thread has access to a resource. Security policy files can control this access. The policy files themselves are managed by the deployer and the sysadmin for the container. The permissions listed in this article are ones that affect the functioning of the JDBC driver.
A typical permission in the policy file looks like the following.
// Example policy file entry.
grant [signedBy <signer>,] [codeBase <code source>] {
permission <class> [<name> [, <action list>]];
};
The following codebase should be restricted to the JDBC driver codebase to ensure that you grant the least number of privileges.
grant codeBase "file:/install_dir/lib/-" {
// Grant access to data source.
permission java.util.PropertyPermission "java.naming.*", "read,write";
// Specify which hosts can be connected to.
permission java.net.socketPermission "host:port", "connect";
// Logger permission to take advantage of logging.
permission java.util.logging.LoggingPermission;
// Grant listen/connect/accept permissions to the driver if
// connecting to a named instance as the client driver.
// This connects to a udp service and listens for a response.
permission java.net.SocketPermission "*", "listen, connect, accept";
};
Note
The code "file:/install_dir/lib/-" refers to the installation directory of the JDBC driver.
Protecting server communication
When you use the JDBC driver to communicate with a SQL Server database, it's important to secure the communication channel. You can secure the channel by using either Internet Protocol Security (IPSEC) or Transport Layer Security (TLS), previously known as Secure Sockets Layer (SSL), or you can use both.
TLS support can be used to provide an extra level of protection besides IPSEC. For more information about using TLS, see Using encryption.