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The technique is implemented by the configuration item AuthDigestDomain, where both the URLs /browse and /browse/authenticate are referenced. Because the configuration item Directory references the URL /browse/authenticate, only the URL /browse/authenticate will be challenged for an authentication. To illustrate that the technique actually works, consider the following HTTP conversation. First, a request is made for an unprotected resource: GET /browse/ HTTP/1.1 Host: jupiter:8100 User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.7.5) Gecko/20041220 K-Meleon/0.9 Accept: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9, text/plain;q=0.8,image/png,*/*;q=0.5 The server responds as usual with an HTTP 200 return code, which causes the client to load the resulting page. Then the client makes another request to the protected link because the user wants to shop and needs to be authenticated. The client makes the following request for the protected content: GET /browse/authenticate HTTP/1.1 Host: 192.168.1.103:8100 User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.7.5) Gecko/20041220 K-Meleon/0.9 Accept: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9, EBVN text/plain;q=0.8,image/png,*/*;q=0.5 The server responds with an authentication challenge: HTTP/1.1 401 Authorization Required Date: Sun, 28 Aug 2005 16:08:28 GMT Server: Apache/2.0.53 (Ubuntu) PHP/4.3.10-10ubuntu4 WWW-Authenticate: Digest realm="Private Domain", nonce="yiLhlmf/AwA=e1bafc57a6151c77e1155729300132415fc8ad0c", algorithm=MD5, domain="/browse /browse/authenticate", qop="auth" Content-Length: 503 Content-Type: text/html; charset=iso-8859-1 In the server response for the domain identifier, a nonprotected resource is defined. This is the technique used to send authorization information for nonprotected content. The client responds with user authentication as follows: GET /browse/authenticate HTTP/1.1 Host: 192.168.1.103:8100 User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.7.5) Gecko/20041220 K-Meleon/0.9 Accept: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9, text/plain;q=0.8,image/png,*/*;q=0.5 Authorization: Digest username="cgross", realm="Private Domain", nonce="yiLhlmf/AwA=e1bafc57a6151c77e1155729300132415fc8ad0c",
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uri="/browse/authenticate", algorithm=MD5, response="c9b5662c034344a06103ca745eb5ebba", qop=auth, nc=00000001, cnonce="082c875dcb2ca740" After the authentication, the server allows the downloading of the protected content. Now if the client browses the unprotected URLs again, the authorization information is passed to the server, as illustrated by the following request: GET /browse/morecontent / HTTP/1.1 Host: jupiter:8100 User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.7.5) Gecko/20041220 K-Meleon/0.9 Accept: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9, text/plain;q=0.8,image/png,*/*;q=0.5 Authorization: Digest username="cgross", realm="Private Domain", nonce="yiLhlmf/AwA=e1bafc57a6151c77e1155729300132415fc8ad0c", uri="/browse/morecontent/", algorithm=MD5, response="18ccd32175ce7a3480d5fbbc24de8889", qop=auth, nc=00000005, cnonce="0d448aca73b76eb1" For this request, the client has sent authorization information for a URL that does not require authentication. Simply put, the authentication mechanism has become an HTTP cookie mechanism that is controlled by the client. The client is in full control of when to E B V N become authenticated and when to remain anonymous.
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The other way of creating a user identifier is to use an HTTP cookie, as illustrated in Figure 5-9. Frameworks such as ASP.NET have made it very comfortable to implement user identifiers that are cross-referenced with an HTTP cookie. The cross-referencing of the HTTP cookie with the authorization of a resource is not implemented by default in ASP.NET, but it is not difficult to implement. Generating the Cookie It is possible to generate an HTTP cookie3 without using any help from a library. Because of the prevalence of cookies, most server-side libraries have classes or functions to generate cookies based on a few parameters. Using the available server-side libraries is highly recommended. Generating the cookie by using the server-side libraries is not difficult. When using ASP.NET, the following source code would be used: HttpCookie mycookie = new HttpCookie("Sample", "myvalue"); mycookie.Path = "/ajax/chap05"; Page.Response.Cookies.Add(mycookie); A cookie is instantiated (HttpCookie) and at a minimum the key (Sample) and value (myvalue) are specified. The combination key-value pair is sent between the client and server. The cookie property mycookie.Path specifies for which URL and its descendents the cookie is valid. Comparing
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3. http://www.ietf.org/rfc/rfc2965.txt
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this to HTTP authentication, the cookie path is equal to the HTTP authentication realm. The newly created cookie is added to the response by using the method Page.Response.Cookies. Add. When a cookie is added, the HTTP response will generate a cookie using the Set-Cookie HTTP header, as illustrated by the following HTTP server response: HTTP/1.0 200 OK Server: Mono-XSP Server/1.0.9.0 Unix X-Powered-By: Mono Date: Sun, 28 Aug 2005 17:31:14 GMT Content-Type: text/html; charset=utf-8 Set-Cookie: Sample=myvalue; path=/ajax/chap05 Content-Length: 388 Keep-Alive: timeout=15, max=99 Connection: Keep-Alive The cookie Sample has a value of myvalue and is valid for the path /ajax/chap05. Because there is no expires value, the cookie is valid only for the lifetime of the browser. If the browser is closed, the cookie is deleted, thus behaving like an HTTP authentication-based user identifier. Understanding How the Client Manages the Cookie When the client receives the cookie, the cookie will automatically be saved if the client is a browser or the XMLHttpRequest object of the browser. In fact, the JavaScript on the client side has to do absolutely nothing with the assigned cookie because everything occurs transparEBVN ently. For example, if a browser loads a page and a cookie is assigned for the entire domain, and then when the XMLHttpRequest object calls a page within the domain, the cookie will be sent. One thing that is not recommended is the storing of sensitive information within the cookie. Storing passwords or any kind of personal information is not recommended. A cookie is a reference to information, not a repository for information. When a user has been authenticated by using other means, a cookie should be used only as a token to identify the user. Identifying a User with a Cookie When the server generates a cookie, it means nothing because a cookie is just a token. Going back to the shopping mall example, it is equivalent to giving each person a token that provides a reference to that person, and as that person wanders the mall, data is generated. To crossreference the token, an authentication mechanism has to be applied. Two authentication mechanisms could be used. The first is to tie the cookie with HTTP authentication. The second is to create an HTML page that associates the cookie with a user. Using HTTP authentication to associate a user with a cookie would involve protecting a file that requires an explicit authentication. When the user is authenticated by using HTTP authentication the protected file is responsible for associating the cookie and authentication information. Implementing HTTP authentication in the context of a cookie is similar to the pure HTTP authentication example. The URL used to authenticate the user has a slightly modified implementation. The same interfaces are used in the HTTP authentication example except that the IUserIdentificationResolver<> implementation resolves the authorization and associates it with the cookie. Other than the slight modification of IUserIdentificationResolver<>, the exact same source code as was illustrated in the HTTP authentication can be used. The difference
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