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commented
4 hours ago Reviewer's Guide by Sourcery
This PR implements URL sandboxing for HTTP requests by replacing the standard requests.get with a secure alternative safe_requests.get. The change helps prevent Server-Side Request Forgery (SSRF) attacks by enforcing restrictions on URL protocols and blocking access to known infrastructure targets.
Sequence diagram for safe_requests.get usage
sequenceDiagram
participant User
participant FlaskApp
participant safe_requests
User->>FlaskApp: GET /request-url?loc=<url>
FlaskApp->>safe_requests: safe_requests.get(url)
safe_requests-->>FlaskApp: Response
FlaskApp-->>User: ResponseClass diagram for Task and fetch_leetcode_folder_tasks function
classDiagram
class Task {
+String id
+String title
+String solution
+String difficulty
}
class fetch_leetcode_folder_tasks {
+list~Task~ fetch_leetcode_folder_tasks(Path solutions_folder)
}File-Level Changes
| Change | Details | Files |
|---|---|---|
| Replace standard requests library with security-enhanced safe_requests |
|
scripts/leetcode_directory_md.py |
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This codemod sandboxes calls to
requests.getto be more resistant to Server-Side Request Forgery (SSRF) attacks.Most of the time when you make a
GETrequest to a URL, you're intending to reference an HTTP endpoint, like an internal microservice. However, URLs can point to local file system files, a Gopher stream in your local network, a JAR file on a remote Internet site, and all kinds of other unexpected and undesirable outcomes. When the URL values are influenced by attackers, they can trick your application into fetching internal resources, running malicious code, or otherwise harming the system. Consider the following code for a Flask app:In this case, an attacker could supply a value like
"http://169.254.169.254/user-data/"and attempt to access user information.Our changes introduce sandboxing around URL creation that force developers to specify some boundaries on the types of URLs they expect to create:
This change alone reduces attack surface significantly because the default behavior of
safe_requests.getraises aSecurityExceptionif a user attempts to access a known infrastructure location, unless specifically disabled.If you have feedback on this codemod, please let us know!
F.A.Q.
Why does this codemod require a Pixee dependency?
We always prefer to use built-in Python functions or one from a well-known and trusted community dependency. However, we cannot find any such control. If you know of one, please let us know.
Why is this codemod marked as Merge After Cursory Review?
By default, the protection only weaves in 2 checks, which we believe will not cause any issues with the vast majority of code:
However, on rare occasions an application may use a URL protocol like "file://" or "ftp://" in backend or middleware code.
If you want to allow those protocols, change the incoming PR to look more like this and get the best security possible:
Dependency Updates
This codemod relies on an external dependency. However, we were unable to automatically add the dependency to your project.
This library holds security tools for protecting Python API calls.
There are a number of places where Python project dependencies can be expressed, including
setup.py,pyproject.toml,setup.cfg, andrequirements.txtfiles. You may need to manually add this dependency to the proper location in your project.Manual Installation
For
setup.py:For
pyproject.toml(usingsetuptools):For
setup.cfg:For
requirements.txt:For more information on adding dependencies to
setuptoolsprojects, see the setuptools documentation.If you are using another build system, please refer to the documentation for that system to determine how to add dependencies.
More reading
* [https://github.com/pixee/python-security/blob/main/src/security/safe_requests/api.py](https://github.com/pixee/python-security/blob/main/src/security/safe_requests/api.py) * [https://portswigger.net/web-security/ssrf](https://portswigger.net/web-security/ssrf) * [https://cheatsheetseries.owasp.org/cheatsheets/Server_Side_Request_Forgery_Prevention_Cheat_Sheet.html](https://cheatsheetseries.owasp.org/cheatsheets/Server_Side_Request_Forgery_Prevention_Cheat_Sheet.html) * [https://www.rapid7.com/blog/post/2021/11/23/owasp-top-10-deep-dive-defending-against-server-side-request-forgery/](https://www.rapid7.com/blog/post/2021/11/23/owasp-top-10-deep-dive-defending-against-server-side-request-forgery/) * [https://blog.assetnote.io/2021/01/13/blind-ssrf-chains/](https://blog.assetnote.io/2021/01/13/blind-ssrf-chains/)🧚🤖 Powered by Pixeebot
Feedback | Community | Docs | Codemod ID: pixee:python/url-sandbox
Summary by Sourcery
Enhance security by sandboxing URL requests with 'safe_requests' to prevent SSRF attacks, replacing 'requests.get' with 'safe_requests.get' for safer URL handling.
New Features:
Enhancements: