Improving Web Application Security: Threats and - CGISecurity

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268 Part III: Building Secure Web ApplicationsRange ChecksSometimes you need to validate that input data falls within a predetermined range.The following code uses an ASP.NET RangeValidator control to constrain input towhole numbers between 0 and 255. This example also uses theRequiredFieldValidator. Without the RequiredFieldValidator, the other validatorcontrols accept blank input.The following example shows how to validate range using the Regex class:try{// The conversion will raise an exception if not valid.int i = Convert.ToInt32(sInput);if ((0
Chapter 10: Building Secure ASP.NET Pages and Controls 269Sanitizing InputSanitizing is about making potentially malicious data safe. It can be helpful when therange of allowable input cannot guarantee that the input is safe. This might includestripping a null from the end of a user-supplied string or escaping values so they aretreated as literals. If you need to sanitize input and convert or strip specific inputcharacters, use Regex.Replace.Note Use this approach for defense in depth. Always start by constraining input to the set of known“good” values.The following code strips out a range of potentially unsafe characters, including < > \" ' % ; ( ) &.private string SanitizeInput(string input){Regex badCharReplace = new Regex(@"([""'%;()&])");string goodChars = badCharReplace.Replace(input, "");return goodChars;}For more information about sanitizing free format input fields, such as commentfields, see “Sanitizing Free Format Input” under “Cross-Site Scripting,” later in thischapter.Validating HTML ControlsIf you do not use server controls — that is, controls with the runat=“server” attribute— and instead use regular HTML controls, you cannot use the ASP.NET validatorcontrols. Instead, you can validate your Web pages’ content by using regularexpressions in the Page_Load event handler, as follows.using System.Text.RegularExpressions;. . .private void Page_Load(object sender, System.EventArgs e){// Note that IsPostBack applies only for// server forms (with runat="server")if ( Request.RequestType == "POST" ) // non-server forms{// Validate the supplied email addressif( !Regex.Match(Request.Form["email"],@"\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*",RegexOptions.None).Success){// Invalid email address}(continued)
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Contents xxvii.NET Remoting Securit
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Contents xxixStaying Secure (contin
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Contents xxxiASP.NET Architecture o
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Contents xxxiiiSummary ............
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Contents xxxvIndex of Checklists 68
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Contents xxxviiChecklistSecuring Da
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Contents xxxixHow ToIndex 743How To
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Contents xliRestricting Server-to-S
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ForewordsForeword by Mark CurpheyWh
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Part IIntroduction to Threats andCo
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3Threat ModelingIn This Chapter●
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Chapter 3: Threat Modeling 47Threat
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Part IIDesigning SecureWeb Applicat
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Part IIIBuilding Secure WebApplicat
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8Code Access Security in PracticeIn
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Part IVSecuring Your Network,Host,
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18Securing Your Database ServerIn T
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21Code ReviewIn This Chapter●●
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