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45 lines
2.0 KiB
Markdown
45 lines
2.0 KiB
Markdown
# Embrace linter security rules
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### One Paragraph Explainer
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Security plugins for ESLint and TSLint such as [eslint-plugin-security](https://github.com/nodesecurity/eslint-plugin-security) and [tslint-config-security](https://www.npmjs.com/package/tslint-config-security) offer code security checks based on a number of known vulnerabilities, such as unsafe RegEx, unsafe use of `eval()`, and non-literal filenames being used when accessing the file system within an application. The use of git hooks such as [pre-git](https://github.com/bahmutov/pre-git) allows to further enforce any rules on source control before they get distributed to remotes, one of which can be to check that no secrets were added to source control.
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### `eslint-plugin-security` example
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Some examples of unsafe practice rules detected by `eslint-plugin-security`:
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`detect-pseudoRandomBytes`
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```javascript
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const insecure = crypto.pseudoRandomBytes(5);
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```
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`detect-non-literal-fs-filename`
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```javascript
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const path = req.body.userinput;
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fs.readFile(path);
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```
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`detect-eval-with-expression`
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```javascript
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const userinput = req.body.userinput;
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eval(userinput);
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```
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`detect-non-literal-regexp`
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```javascript
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const unsafe = new RegExp('/(x+x+)+y/)');
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```
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An example of running `eslint-plugin-security` on a Node.js project with the above unsafe code practices:
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### What other bloggers say
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From the blog by [Adam Baldwin](https://www.safaribooksonline.com/blog/2014/03/28/using-eslint-plugins-node-js-app-security/):
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> Linting doesn’t have to be just a tool to enforce pedantic rules about whitespace, semicolons or eval statements. ESLint provides a powerful framework for eliminating a wide variety of potentially dangerous patterns in your code (regular expressions, input validation, and so on). I think it provides a powerful new tool that’s worthy of consideration by security-conscious JavaScript developers.
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