Location and Parent Location

Oct 13, 2025 by wbrum.org 29 views

Introduction

In the realm of web development, particularly with the integration of Playwright, understanding the nuances of TaintReport and Taint types is crucial for effective support and debugging. This article aims to provide a detailed documentation of these types, shedding light on their structure and properties. By the end of this guide, you will have a thorough understanding of TaintReport and Taint types, enabling you to tackle complex issues with confidence.

TaintReport Types

A TaintReport is a data structure that contains information about a tainted value in a web application. It provides insights into the origin, propagation, and impact of the tainted value. The following sections delve into the properties of a TaintReport.

Location and Parent Location

A TaintReport contains two essential properties: loc and parentloc. These properties represent the location and parent location of the tainted value, respectively.

loc: string;
parentloc: string;

The loc property specifies the location of the tainted value, which can be a file path, a function name, or a line number. The parentloc property, on the other hand, indicates the parent location of the tainted value, providing context about the origin of the tainted value.

Referrer and Sink

A TaintReport also includes referrer and sink properties, which are crucial in understanding the propagation of tainted values.

referrer: string;
sink: string;

The referrer property identifies the referrer of the tainted value, indicating the source of the tainted value. The sink property, conversely, specifies the sink of the tainted value, representing the destination where the tainted value is ultimately propagated.

String Representation and Subframe

A TaintReport contains a str property, which provides a string representation of the tainted value.

str: string; // taint is accessible via str.taint

The str property allows developers to access the tainted value as a string, facilitating easier debugging and analysis. Additionally, a TaintReport includes a subframe property, indicating whether the report occurred in a subframe (e.g., iframe) of the top-level frame.

subframe: boolean; // tells whether the report occurred in a subframe (e.g., iframe) of the top-level frame

Stack and Timestamp

A TaintReport also includes a stack property, which represents the call stack of the tainted value.

stack: any; // TODO: refine me

The stack property provides a detailed view of the call stack, enabling developers to identify the sequence of function calls that led to the tainted value. Furthermore, a TaintReport includes a timestamp property, indicating the time at which the report was generated.

timestamp: number;

Taint Types

A Taint is a data structure that represents a tainted value in a web application. It consists of a collection of TaintRange objects, each describing a range of tainted values.

TaintRange

A TaintRange represents a range of tainted values, specifying the begin and end indices of the tainted substring.

interface TaintRange {
  begin: number; // begin of the substring influenced by operations in this.flow
  end: number; // end of the substring influenced by operations in this.flow
  flow: FlowOp[];
}

The begin and end properties define the range of tainted values, while the flow property represents the sequence of operations that influenced the tainted values.

FlowOp

A FlowOp represents an operation that influenced the tainted values. It includes properties such as arguments, builtin, location, operation, and source.

interface FlowOp {
  arguments: string[]; // TODO: refine depending on the value of this.operation
  builtin: boolean;
  location: FlowOpLoc;
  operation: string;
  source: boolean; // tells whether this operation is a source or not
}

The arguments property specifies the arguments passed to the operation, while the builtin property indicates whether the operation is a built-in function. The location property represents the location of the operation, and the operation property specifies the name of the operation. Finally, the source property indicates whether the operation is a source of tainted values.

FlowOpLoc

A FlowOpLoc represents the location of an operation, including properties such as filename, function, line, pos, scripthash, and scriptline.

interface FlowOpLoc {
  filename: string;
  function: string;
  line: number;
  pos: number;
  scripthash: string;
  scriptline: number;
}

The filename property specifies the file name of the operation, while the function property represents the function name. The line and pos properties define the line and position of the operation, respectively. The scripthash and scriptline properties provide additional context about the operation.

Conclusion

Introduction

In our previous article, we delved into the world of TaintReport and Taint types, exploring their structure and properties. However, we understand that sometimes, the best way to learn is through questions and answers. In this article, we will address some of the most frequently asked questions about TaintReport and Taint types, providing you with a deeper understanding of these complex topics.

Q: What is a TaintReport?

A: A TaintReport is a data structure that contains information about a tainted value in a web application. It provides insights into the origin, propagation, and impact of the tainted value.

Q: What are the properties of a TaintReport?

A: A TaintReport contains the following properties:

loc: The location of the tainted value
parentloc: The parent location of the tainted value
referrer: The referrer of the tainted value
sink: The sink of the tainted value
str: A string representation of the tainted value
subframe: A boolean indicating whether the report occurred in a subframe (e.g., iframe) of the top-level frame
stack: The call stack of the tainted value
timestamp: The time at which the report was generated

Q: What is a Taint?

A: A Taint is a data structure that represents a tainted value in a web application. It consists of a collection of TaintRange objects, each describing a range of tainted values.

Q: What is a TaintRange?

A: A TaintRange represents a range of tainted values, specifying the begin and end indices of the tainted substring.

Q: What are the properties of a TaintRange?

A: A TaintRange contains the following properties:

begin: The begin index of the tainted substring
end: The end index of the tainted substring
flow: The sequence of operations that influenced the tainted values

Q: What is a FlowOp?

A: A FlowOp represents an operation that influenced the tainted values. It includes properties such as arguments, builtin, location, operation, and source.

Q: What are the properties of a FlowOp?

A: A FlowOp contains the following properties:

arguments: The arguments passed to the operation
builtin: A boolean indicating whether the operation is a built-in function
location: The location of the operation
operation: The name of the operation
source: A boolean indicating whether the operation is a source of tainted values

Q: What is a FlowOpLoc?

A: A FlowOpLoc represents the location of an operation, including properties such as filename, function, line, pos, scripthash, and scriptline.

Q: What are the properties of a FlowOpLoc?

A: A FlowOpLoc contains the following properties:

filename: The file name of the operation
function: The function name of the operation
line: The line number of the operation
pos: The position of the operation
scripthash: The script hash of the operation
scriptline: The script line number of the operation

Q: How do I use TaintReport and Taint types in my web application?

A: TaintReport and Taint types can be used in various ways to improve the security and reliability of your web application. For example, you can use TaintReport to track the origin and propagation of tainted values, and use Taint types to identify and isolate tainted values.

Q: What are some common use cases for TaintReport and Taint types?

A: Some common use cases for TaintReport and Taint types include:

Identifying and isolating tainted values in web applications
Tracking the origin and propagation of tainted values
Improving the security and reliability of web applications
Debugging and troubleshooting web applications

Conclusion

In conclusion, this Q&A guide has provided you with a deeper understanding of TaintReport and Taint types, including their structure, properties, and use cases. By understanding these complex topics, you can improve the security and reliability of your web application and identify and isolate tainted values.