spring-security/docs/guides/src/asciidoc/_hello-includes/secure-the-application.asc

== Securing the application

Before securing your application, it is important to ensure that the existing application works as we did in <<running-the-{starter-appname}-application>>. Now that the application runs without security, we are ready to add security to our application. This section demonstrates the minimal steps to add Spring Security to a Spring MVC application.

=== Updating your dependencies

You will need to ensure you have added the dependencies. Spring Security milestones and release candidates are available in the https://github.com/SpringSource/spring-framework/wiki/SpringSource-repository-FAQ[Spring Milestone Repository]. In short, if you are using Maven and using a milestone or release candidates ensure you have the following repository in your pom.xml:

.pom.xml
[source,xml]
----
<repositories>
  <!-- ... possibly other repository elements ... -->
  <repository>
    <id>spring-libs-milestone</id>
    <name>Spring Milestone Repository</name>
    <url>http://repo.springsource.org/milestone</url>
  </repository>
</repositories>
----

You will then need to include the Spring Security dependencies

.pom.xml
[source,xml]
[subs="verbatim,attributes"]
----
<dependencies>
  <!-- ... other dependency elements ... -->
  <dependency>
    <groupId>org.springframework.security</groupId>
    <artifactId>spring-security-web</artifactId>
    <version>{spring-security-version}</version>
  </dependency>
  <dependency>
    <groupId>org.springframework.security</groupId>
    <artifactId>spring-security-config</artifactId>
    <version>{spring-security-version}</version>
  </dependency>
</dependencies>
----

After you have completed this, you need to ensure that STS knows about the updated dependencies by:

* Right click on the _spring-security-samples-{starter-appname}_ application
* Select *Maven->Update project...*
* Ensure the project is selected, and click *OK*

=== Creating your Spring Security configuration

The next step is to create a Spring Security configuration.

* Right click the _spring-security-samples-{starter-appname}_ project the Package Explorer view
* Select *New->Class*
* Enter _org.springframework.security.samples.config_ for the *Package*
* Enter _SecurityConfig_ for the *Name*
* Click *Finish*
* Replace the file with the following contents:

[[security-config-java]]
.src/main/java/org/springframework/security/samples/config/SecurityConfig.java
[source,java]
----
package org.springframework.security.samples.config;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.context.annotation.*;
import org.springframework.security.config.annotation.authentication.builders.*;
import org.springframework.security.config.annotation.web.configuration.*;

@Configuration
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {

    @Autowired
    public void configureGlobal(AuthenticationManagerBuilder auth) throws Exception {
        auth
            .inMemoryAuthentication()
                .withUser("user").password("password").roles("USER");
    }
}
----

[[servlet-api-integration]]
The <<security-config-java,`SecurityConfig`>> will:

* Require authentication to every URL in your application
* Generate a login form for you
* Allow the user with the *Username* _user_ and the *Password* _password_ to authenticate with form based authentication
* Allow the user to logout
* http://en.wikipedia.org/wiki/Cross-site_request_forgery[CSRF attack] prevention
* http://en.wikipedia.org/wiki/Session_fixation[Session Fixation] protection
* Security Header integration
** http://en.wikipedia.org/wiki/HTTP_Strict_Transport_Security[HTTP Strict Transport Security] for secure requests
** http://msdn.microsoft.com/en-us/library/ie/gg622941(v=vs.85).aspx[X-Content-Type-Options] integration
** Cache Control (can be overridden later by your application to allow caching of your static resources)
** http://msdn.microsoft.com/en-us/library/dd565647(v=vs.85).aspx[X-XSS-Protection] integration
** X-Frame-Options integration to help prevent http://en.wikipedia.org/wiki/Clickjacking[Clickjacking]
* Integrate with the following Servlet API methods
** http://docs.oracle.com/javaee/6/api/javax/servlet/http/HttpServletRequest.html#getRemoteUser()[HttpServletRequest#getRemoteUser()]
** http://docs.oracle.com/javaee/6/api/javax/servlet/http/HttpServletRequest.html#getUserPrincipal()[HttpServletRequest.html#getUserPrincipal()]
** http://docs.oracle.com/javaee/6/api/javax/servlet/http/HttpServletRequest.html#isUserInRole(java.lang.String)[HttpServletRequest.html#isUserInRole(java.lang.String)]
** http://docs.oracle.com/javaee/6/api/javax/servlet/http/HttpServletRequest.html#login(java.lang.String,%20java.lang.String)[HttpServletRequest.html#login(java.lang.String, java.lang.String)]
** http://docs.oracle.com/javaee/6/api/javax/servlet/http/HttpServletRequest.html#logout()[HttpServletRequest.html#logout()]