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392 Part III: Building Secure Web ApplicationsUse a Generic Error Page in Your ASP.NET ApplicationsIf your data access code is called by an ASP.NET Web application or Web service,you should configure the element to prevent exception detailspropagating back to the end user. You can also specify a generic error page by usingthis element, as shown below.Set mode=“On” for production servers. Only use mode=“Off” when you aredeveloping and testing software prior to release. Failure to do so results in rich errorinformation, such as that shown in Figure 14.4, being returned to the end user. Thisinformation can include the database server name, database name, and connectioncredentials.Figure 14.4Detailed exception information revealing sensitive data
Chapter 14: Building Secure Data Access 393Figure 14.4 also shows a number of vulnerabilities in the data access code near theline that caused the exception. Specifically:● The connection string is hard-coded.● The highly privileged sa account is used to connect to the database.●●The sa account has a weak password.The SQL command construction is susceptible to SQL injection attack; the input isnot validated, and the code does not use parameterized stored procedures.Building a Secure Data Access ComponentThe following code shows a sample implementation of a CheckProductStockLevelmethod used to query a products database for stock quantity. The code illustrates anumber of the important security features for data access code introduced earlier inthis chapter.using System;using System.Data;using System.Data.SqlClient;using System.Text.RegularExpressions;using System.Collections.Specialized;using Microsoft.Win32;using DataProtection;public static int CheckProductStockLevel(string productCode){int quantity = 0;// (1) Code protected by try/catch blocktry{// (2) Input validated with regular expression// Error messages should be retrieved from the resource assembly to help// localization. The Localization code is omitted for the sake of brevity.if (Regex.IsMatch(productCode, "^[A-Za-z0-9]{12}$") == false)throw new ArgumentException("Invalid product code" );//(3) The using statement ensures that the connection is closedusing (SqlConnection conn = new SqlConnection(GetConnectionString())){// (4) Use of parameterized stored procedures is a countermeasure for// SQL injection attacksSqlCommand cmd = new SqlCommand("spCheckProduct", conn);cmd.CommandType = CommandType.StoredProcedure;(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 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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8Code Access Security in PracticeIn
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18Securing Your Database ServerIn T
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21Code ReviewIn This Chapter●●
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patterns & practicesProven practice
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