security - How does the web container know about the role of the user -


i new web-app development , security , trying understand things around.

everywhere implementing security in webapp ask use declarative security. example in tomcat can declare roles in tomcat-user.xml file following one.

<tomcat-users> <user name="tomcat" password="s3cret" roles="manager-gui" /> </tomcat-users>

this part can understand.

now suppose have added of these roles in web-app. user of web-app makes request resource in web-app. want know how container or i know with role user has made request?

thank you.

using tomcat , jsp:

a datasourcerealm can point database containing user , user role tables, using userdatabaserealm (points tomcat-users.xml) works fine well.

if want protect jsp pages in specific folder, add web.xml

<security-constraint> <web-resource-collection>   <web-resource-name>folder description</web-resource-name>   <url-pattern>/foldername/*</url-pattern> </web-resource-collection> <auth-constraint>   <role-name>role_admin</role-name> </auth-constraint> </security-constraint>

if want know if user has specific role upon entering page, can use

boolean hasadminrole = request.isuserinrole("role_admin");

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