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<forms loginURL="LoginForm.aspx" />
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</authentication>
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Lesson 2: Using Windows, Forms, Passport, and Anonymous Authentication
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Optimizing security for forms authentication
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For optimal security (with a slight performance cost), leave protection at the default setting of All.
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By default, ASP.NET stores the authentication token in a cookie for most devices. However, if the browser does not support cookies, ASP.NET will store the authentica tion information as part of the URL. You can control this behavior by setting the cook ieless attribute of the <forms> element to one of the following settings:
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UseCookies
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Always attempts to send a cookie to the client, even if the client indi cates it cannot support cookies.
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UseUri
Always stores the authentication token as part of the URL rather than a cookie. Technically, the token is stored in the Uniform Resource Identifier (URI), which is the last portion of the URL. If a browser indicates that it supports cookies, the AutoDetect set ting causes ASP.NET to test whether the browser actually does support cookies. If it does not, or if the browser indicates that it does not support cookies, ASP.NET uses cookieless authentication instead. The default setting, UseDeviceProfile, uses a cookie to prove authentication if the browser profile indicates that it supports cookies. You might find that some users have changed the default setting to not allow cookies. In this case, forms authentication does not work properly unless you change this setting to AutoDetect.
AutoDetect
UseDeviceProfile
For example, the following section of a Web.config file enables cookieless forms authentication for all clients. This works well, but it causes the authentication token to be included in bookmarks and whenever the user sends a URL to another user:
<authentication mode="Forms" > <forms Cookieless="UseUri" loginURL="LoginForm.aspx" /> </authentication>
Another important attribute of the <forms> section is timeout, which defines, in minutes, the amount of idle time allowed between requests before the user is forced to log on again. If the <forms> section is <forms loginUrl="YourLogin.aspx" timeout="10">, the user is forced to log on again if he or she does not send any requests to the ASP.NET application within 10 minutes. This number should be decreased to reduce the risk of
11
Implementing Authentication and Authorization
the browser being misused while the user is away from the computer. The <forms> sec tion has other attributes, but LoginUrl, protection, and timeout are the most important.
Quick Check
1. By default, under what circumstances does forms authentication provide cookies to the browser 2. If you have users who have disabled cookies in their browsers, what can you do to enable them to use forms authentication
Quick Check Answers
1. By default, cookies are provided to browser types that support cookies, whether or not the browser has cookies enabled. 2. Use the AutoDetect setting.
Configuring User Accounts in the Web.Config File
To avoid creating a database to store user credentials, you can store the user creden tials directly in the Web.config file. The passwords can be stored in one of three for mats: clear text, encrypted with the MD5 one-way hash algorithm, or encrypted with the SHA1 one-way hash algorithm. Using one of the two hash algorithms to mask the user credentials reduces the likelihood that a malicious user with read access to the Web.config file will gather another user s login information. Define the hashing method used within the <forms> section, in the <credentials> section. An example is shown here:
<authentication mode="Forms"> <forms loginUrl="login.aspx" protection="Encryption" timeout="30" > <credentials passwordFormat="SHA1" > <user name="Eric password="07B7F3EE06F278DB966BE960E7CBBD103DF30CA6"/> <user name="Sam" password="5753A498F025464D72E088A9D5D6E872592D5F91"/> </credentials> </forms> </authentication>
To enable administrators to use hashed password information in the Web.config file, your ASP.NET application must include a page or tool to generate these passwords. The passwords are stored in hexadecimal format and hashed with the specified hash ing protocol. You can use the System.Security.Cryptography namespace to generate such a hash. The following console application demonstrates this by accepting a
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