c# gs1-128

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The bottom line is that manually escaping characters used to form SQL queries can help, but it will not make your application secure from SQL injection attacks Another solution commonly proposed for dealing with SQL injection attacks is to use stored procedures Although stored procedures can prevent some types of SQL injection attacks, they fail to protect against many others Stored procedures typically help prevent SQL injection attacks by limiting the types of statements that can be passed to their parameters However, there are many ways around the limitations and many dangerous statements that can still be passed to stored procedures Again, stored procedures can prevent some exploits, but they will not make your application secure against SQL injection attacks For once, the best answer is also one of the simplest: Use parameterized SQL queries whenever user input needs to come in contact with SQL

redirects, permalinks, and a handful of other edge cases, it s the Rails way to use _path instead of _url It produces a shorter string and the user agent (browser or otherwise) should be able to infer the fully qualified URL whenever it needs to do so, based on the HTTP headers of the request, a base element in the document, or the URL of the request As you read this book and as you examine other code and other examples, the main thing to remember is that help_url and help_path are basically doing the same thing I tend to use the _url style in general discussions about named route techniques, but to use _path in examples that occur inside view templates (for example, with link_to and form_for) It s mostly a writing-style thing, based on the theory that the URL version is more general and the path version more specialized In any case, it s good to get used to seeing both and getting your brain to view them as very closely connected Using literal URLs

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You can, if you wish, hard-code your paths and URLs as string arguments to link_to, redirect_to, and friends For example, instead of

link_to "Help", :controller => "main", :action => "help"

Many input validation vulnerabilities can be identi ed using taint propagation Consider these four lines of Java:

<wsdl:message name="calculatorRequest"> <wsdl:part element="clc:operands" name="operands"/> </wsdl:message> <wsdl:message name="calculatorResponse"> <wsdl:part element="clc:answer" name="answer"/> </wsdl:message> <wsdl:portType name="Calculator"> <wsdl:operation name="add"> <wsdl:input message="clc:calculatorRequest"/> <wsdl:output message="clc:calculatorResponse"/> </wsdl:operation> <wsdl:operation name="multiply"> <wsdl:input message="clc:calculatorRequest"/> <wsdl:output message="clc:calculatorResponse"/> </wsdl:operation> <wsdl:operation name="subtract"> <wsdl:input message="clc:calculatorRequest"/> <wsdl:output message="clc:calculatorResponse"/> </wsdl:operation> <wsdl:operation name="divide"> <wsdl:input message="clc:calculatorRequest"/> <wsdl:output message="clc:calculatorResponse"/> </wsdl:operation> </wsdl:portType> </wsdl:de nitions>

10

Layouts and Templates 294 1011 Template Filename Conventions 1012 Layouts 294 1013 Yielding Content 295 1014 Conditional Output 296 1015 Decent Exposure 297

lastName = requestgetParameter("last_name"); query = "SELECT phone FROM phnbk WHERE lnam = '" +lastName+"'"; rs = stmtexecuteQuery(query);

1016 Standard Instance Variables 298 1017 Displaying flash Messages 300 1018 flashnow 301 102 Partials 302 1021 Simple Use Cases 302 1022 Reuse of Partials 303 1023 Shared Partials 304 1024 Passing Variables to Partials 305 1025 Rendering Collections 306 1026 Logging 308 103 Conclusion 308

11

To correctly identify the SQL injection vulnerability, a taint propagation algorithm needs to be armed with three rules:

111 1111 1112 1113 112

In top-down development, after the service contract is de ned, tooling is typically used to generate actual code artifacts For example, tooling will use the Calculator WSDL as input to generate the previous Java interface shown in Listing 11

113 114 115 116

117 118

Source rule:

309 Reporting Validation Errors 310 Automatic Form Creation 313 Customizing the Way Validation Errors Are Highlighted AssetTagHelper 316 1121 Head Helpers 316 1122 Asset Helpers 319 1123 Using Asset Hosts 321 1124 Using Asset Timestamps 323 1125 For Plugins Only 324 AtomFeedHelper 324 CacheHelper 326 CaptureHelper 326 DateHelper 328 1161 The Date and Time Selection Helpers 328 1162 The Individual Date and Time Select Helpers 329 1163 Common Options for Date Selection Helpers 332 1164 distance in time Methods with Complex Descriptive Names 332 DebugHelper 333 FormHelper 333 1181 Creating Forms for Models 334 1182 How Form Helpers Get Their Values 342 1183 Integrating Additional Objects in One Form 343

1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120

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