ITIT 3200- Web Security Notes - Web Security ● Web Vocabulary www.uncc.edu/index.html Protocol Server name File name Name server IP address Port 80

ITIT 3200- Web Security Notes - Web Security ● Web...

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Web Security Web Vocabulary: - - Protocol - Server name - File name - Name server - IP address - Port 80 - HTTP protocol - GET request - Cookies - HTML text - Server/client (web servers, FTP servers, email servers) - Domain names Web Basics: - client side – interaction with application is handled by browser. - - server side: - web server receives client requests - scripts at the web server extract input from client data construct requests to a back-end server, e.g. a database server - web server receives the result from the back-end server and returns HTML result pages to the client - web server and backend server different logical components but may reside on same physical machine HTTP: - HTTP is the application layer protocol used between client and server. - lies in the application layer of the Internet protocol stack - client sends HTTP requests to the server - request states a method to be performed on a resource held at the server - Assumes a reliable transport layer protocol beneath - HTTP request methods: GET and POST Transport Protocol and Data Formats: - GET method - resource given by the Request-URI and Host fields in the request header - POST method - specifies resource in the Request-URI
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- puts action to be performed on it into body of HTTP request - designed for posting messages, annotating resources, and sending large volumes that would not fit into the RequestURI - web pages in a server response written in HTML - elements that can appear in a web page: - frame (subwindow) - iframe (in-lined subwindow) – - img (embedded image) - applet (Java applet) - form (interactive element specifying an action to be performed on a resources when triggered by a particular event; onlick is such an event) - Cascading Style Sheets (CSS) - give further information on how to display webpage Web Browser: - client browser performs several functions: - displaying web pages - the Document Object Model (DOM) is an internal representation of a webpage used by browsers - JavaScript requires this representation (dynamic rendering) - managing sessions - performing access control when scripts within a web page are executed - when browser receives an HTML page it parses the HTML into the document.body of the DOM - objects like document.URL, document.location, and document.referrer get their values according to the browser’s view of the current page Authenticated Sessions: - When application resources are subject to access control, user at the client has be authenticated as the originator of requests - achieved by establishing an authenticated session, such as using SSL/TLS (not covered in this class) - Cookies are one way to store authentication information Gollmann Exercises: - 18.1 Document the current security settings of your web browser. Where is the security relevant information stored on your system?
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