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hiddenSegments is a collection of elements that will be rejected if they match a path segment of a requested URL. Each element in this collection contains one attribute only, segment, whose value should be a string representing the segment to be blocked. For instance, if a segment is bin, this will block requests for http://example.com/bin/scanme.pl, but will not block requests for http://example.com/rubbish-bin/image.jpg. You can also apply the hiddenSegments collection to WebDAV by setting its applytoWebDAV attribute. denyUrlSequences is a collection of sequences of characters that will be rejected if a request URL contains them. It is very common to include .. as a member of this collection, to prevent directory navigation upward. Elements to be added to this collection have one attribute, sequence, which is a string of characters that will cause the URL to be rejected if they are found anywhere in the URL.
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A rather simple example is the following XML, which prohibits double escaping and high-bit characters; only allows the file extensions .html, .htm, .aspx, and .mspx; sets far shorter maximum length limits on content, URL, and query string; prohibits the server from using verbs other than GET and POST; and blocks any URL containing /../ or .
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<configuration> ... <system.webServer> <security> <requestFiltering allowDoubleEscaping= false allowHighBitCharacters= false <fileExtensions allowUnlisted= false applytoWebDAV= false > <clear> <add fileExtension= html allowed= true /> <add fileExtension= htm allowed= true /> <add fileExtension= aspx allowed= true /> <add fileExtension= mspx allowed= true /> </fileExtensions> <requestLimits maxAllowedContentLength= 1000000 maxURL= 2048 maxQueryString=256/> <verbs allowUnlisted= false applyToWebDAV= false /> <clear/> <add verb= GET allowed= true /> <add verb= POST allowed= true /> </verbs> <denyUrlSequences> <add sequence= /../ /> <add sequence= ... /> </denyUrlSequences> </requestFiltering> </security> </system.webServer> </configuration>
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ASP.NET Server Farms: Machine Keys
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When you operate applications in server farms, you should configure a number of modifications. Because HTTP is a stateless protocol, it is necessary to carry session state information either in the URL or in a cookie. (Recall the earlier discussion of how to configure Forms Authentication to store its authentication state in either a cookie or the query string portion of the URL.) Much of the information in this state, however, needs to be encrypted and/or validated, which requires keys to be used by the Web server. If an encrypted or validated cookie or URL is set at one server, and then fed back as session state to another server, the request will be incomprehensible or invalid if the two servers do not share the same encryption key. By default, ASP.NET machine keys are automatically generated when the application starts, and each application gets its own machine key (so that in a shared hosting environment, one application cannot accidentally access another application s session state). In a Server Farm environment, then, the machine key needs to be shared. This is accomplished by using the ASP.NET Machine Keys feature, and clearing the Automatically Generate At Run Time boxes. At one computer in your server farm, you will then click Generate Keys to put a new, random machine key into the encryption and validation boxes. You can then copy and paste these key settings into the other computers in your server farms. If you are managing a large server farm, or if you will be frequently cycling your Machine Key, you should automate this feature, which you can do through WMI or by directly modifying the Web site s web.config file, as shown in the following example. Note that the validation key should be a randomly generated, 40-128 character hexadecimal string, representing a 20-64 byte random sequence and the decryption key should be a hexadecimal string 16 characters in length when using DES encryption and 48 characters in length when using Triple-DES encryption.
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<configuration> <system.web> <machineKey decryptionKey= E91D...7DB3,IsolateApps validationKey= 215C...528E,IsolateApps />
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If session state seems to be lost intermittently by users, you should check whether the machine keys at all of your servers are set to the same value for the failing application. If one server has a different machine key from another, a user s session state from the first server cannot be read by the second server (and vice versa). All servers must share the same machine key value to be able to use session state from other servers in the farm.
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