What is Content Security Policy (CSP)?

Content Security Policy (CSP) is a security standard that helps prevent XSS, clickjacking, and other code injection attacks by specifying which dynamic resources are allowed to load on a web page, such as scripts, styles, and images.

How do I implement a CSP on my website?

You implement CSP by sending a `Content-Security-Policy` HTTP response header from your web server, or by including a ` ` tag in your HTML. The header is generally preferred for broader coverage and reporting capabilities.

What is the difference between `'self'` and `'none'` in CSP directives?

`'self'` allows resources to be loaded from the same origin as the document. `'none'` disallows loading resources from any source, effectively blocking that type of content.

Should I use `'unsafe-inline'` or `'unsafe-eval'` in my CSP?

Generally, no. `'unsafe-inline'` allows inline scripts and styles, and `'unsafe-eval'` allows `eval()` and similar functions. Both significantly weaken CSP's protection against XSS. Modern CSPs use nonces or hashes for inline content instead.

What is `report-uri` or `report-to` in CSP?

`report-uri` (deprecated) and `report-to` (modern) are directives that instruct the browser to send JSON-formatted violation reports to a specified URL whenever the CSP is violated, allowing developers to monitor and refine their policies.

Can CSP protect against all web vulnerabilities?

No, CSP is a powerful defense against client-side injection attacks like XSS, but it is not a silver bullet. It must be used in conjunction with other security measures, such as input validation, secure coding practices, and server-side security configurations.

Content Security Policy Generator

Content Security Policy Generator Overview

Create secure CSP headers for your website.

A CSP Generator is an online utility that assists in constructing Content Security Policy (CSP) HTTP headers. These headers are a crucial security mechanism designed to prevent various types of attacks, including Cross-Site Scripting (XSS) and data injection. By defining approved sources of content that a web browser is allowed to load for a given page, a CSP significantly reduces the attack surface and helps protect users from malicious code execution. The generator simplifies the complex process of writing these policies by providing an interface to select and configure directives. This generator operates by allowing users to specify various directives such as `script-src`, `style-src`, `img-src`, `connect-src`, and `default-src`, along with their permitted source values (e.g., `'self'`, `https://example.com`, `'unsafe-inline'`, `'unsafe-eval'`). It then compiles these selections into a correctly formatted `Content-Security-Policy` HTTP header string. The tool ensures proper syntax, including semicolons between directives and spaces between sources, adhering to the W3C Content Security Policy Level 3 specification. It also supports `report-uri` or `report-to` directives for monitoring policy violations. Web developers and security engineers use CSP generators to implement robust security policies for their applications. It is particularly valuable for protecting against client-side vulnerabilities in web applications, ensuring that only trusted resources are executed or rendered. Site administrators can deploy these policies to enhance the overall security posture of their web properties, reducing the risk of supply chain attacks and unauthorized content injection.

How to Use Content Security Policy Generator

Select the desired CSP directives from the available options (e.g., `script-src`, `style-src`).
For each selected directive, specify the allowed source values (e.g., `'self'`, `https://cdn.example.com`).
Add `report-uri` or `report-to` directives if you want to monitor CSP violations.
Review the generated `Content-Security-Policy` header string in the output area.
Copy the header and implement it in your web server configuration or as a `` tag.

Frequently Asked Questions

What is Content Security Policy (CSP)?: Content Security Policy (CSP) is a security standard that helps prevent XSS, clickjacking, and other code injection attacks by specifying which dynamic resources are allowed to load on a web page, such as scripts, styles, and images.
How do I implement a CSP on my website?: You implement CSP by sending a `Content-Security-Policy` HTTP response header from your web server, or by including a `` tag in your HTML. The header is generally preferred for broader coverage and reporting capabilities.
What is the difference between `'self'` and `'none'` in CSP directives?: `'self'` allows resources to be loaded from the same origin as the document. `'none'` disallows loading resources from any source, effectively blocking that type of content.
Should I use `'unsafe-inline'` or `'unsafe-eval'` in my CSP?: Generally, no. `'unsafe-inline'` allows inline scripts and styles, and `'unsafe-eval'` allows `eval()` and similar functions. Both significantly weaken CSP's protection against XSS. Modern CSPs use nonces or hashes for inline content instead.
What is `report-uri` or `report-to` in CSP?: `report-uri` (deprecated) and `report-to` (modern) are directives that instruct the browser to send JSON-formatted violation reports to a specified URL whenever the CSP is violated, allowing developers to monitor and refine their policies.
Can CSP protect against all web vulnerabilities?: No, CSP is a powerful defense against client-side injection attacks like XSS, but it is not a silver bullet. It must be used in conjunction with other security measures, such as input validation, secure coding practices, and server-side security configurations.

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