Fuzzing is connected to the phase of information gathering and is an integral part of the black box security testing, which means we just focus on inputs and output of the software system, without bothering about internal knowledge of the software program. The script addresses the issue.įile yourFile = new File("urls.csv") yourFile.createNewFile() f = new FileOutputStream(yourFile, true) p = new PrintStream(f) (p) int matches = Integer.parseInt(vars.get("number_matchNr")) for (int i=1 i<=matches i++) f.close()įuzzing is a way of testing applications, which is based on the transfer of incorrect, random or unforeseen by program logic data and seeing how the system responds. For example, some internal URLs have a dot and no slash at the beginning of the line. Below is the code for the BeanShell PostProcessor, which writes all the received URLs to a file and performs the initial processing of the URL. Now, you can write to the file and work with the URL by using the BeanShell PostProcessor. For example, you can check a page for input forms, and then write the page data into a separate file.ģ. With the help of the elements covered above, we can gather additional information from the pages viewed. It extracts absolutely all the links, which makes it somewhat unsuitable for our task, because it does not distinguish between GET links and POST links, but we only need GET requests for creating a website map.Ī great JMeter advantage when building a spider is the wide configuration variability. This post processor does not have any settings. For example, in the screenshot below, there is this configuration to extract a link from a tag. It allows you to easily select HTML DOM elements that might otherwise have been difficult to write a regular expression for. Right Click on HTTP Request Sampler -> Add -> Post Processors -> CSS/JQuery ExtractorĬSS/JQuery is more convenient and readable than Regex and XPath. The XPath query for this case looks as follows: and the configuration of the element for this case is shown below. To do this, we will use the XPath Extractor element. You can also extract the URL using the XPath query. Right Click on HTTP Request Sampler -> Add -> Post Processors -> XPath Extractor The configuration of the element for this case is shown below. For example, a regular expression for extracting a link from a tag looks as follows: - “ ]*?\s+)?href=()(.*?)\1”. The Regular Expression Extractor enables applying a regular expression to the response body of the HTTP Request Sampler. Right Click on HTTP Request Sampler -> Add -> Post Processors -> Regular Expression Extractor To extract URL links, we can use several elements: Back to top The Regular Expression Extractor After adding a Thread Group, you can use the HTTP Request Sampler ( Right Click on Thread Group -> Add -> Sampler -> HTTP Request), which allows you to send various HTTP Requests.Ģ. You can learn more from this blog post “How to Spider a Site with JMeter - A Tutorial”.ġ. A similar problem occurs with most Spiders. So Javascript and unusual objects, such as Flash, will be skipped. In particular, JMeter does not execute Javascript found in HTML pages. Therefore, JMeter does not perform all the actions supported by browsers. While we can build a JMeter script that will perform this function, it’s important to understand that JMeter is not a browser, but rather works at protocol level. Follow each link and analyze the responses.Let’s look briefly at the order of actions that the Spider carries out, which the JMeter script should perform too: This information enables us to determine the most obvious attack vectors and choose the appropriate test data. You can use the information to draw conclusions about the size of the tested space, its functionality and, possibly, the tools used in development. Site Spider allows you to draw a map of the site's visible places (places that you can access using only the interface of the website). When testing the security of your software, the most important phase is information gathering. Compared to them, JMeter seems like a more accessible and attractive option. But most of them are commercial and cost hundreds or thousands of dollars. Why JMeter? There are specialized security testing software, like, Burp Suite or Acunetix.
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