#repo_scraper

Check your projects for possible password (or other sensitive data) leaks.

The library exposes two commands:

• check-dir - Performs checks on a folder and subdirectories
• check-repo - Performs a check in a git repository

Both scripts work almost the same from the user point of view, enter check-dir --help or check-repo --help for more details.

##Example

Check your dummy-project:

check-dir dummy-project

Output:

Checking folder dummy-project...

dummy-project/python_file_with_password.py
ALERT - MATCH ["password = 'qwerty'"]

dummy-project/dangerous_file.json
ALERT - MATCH ['"password": "super-secret-password"']

##How does it work?

Briefly speaking, check-dir lists all files below a folder and applies regular expressions to look for passwords/IPs. Given that a blind search would never end (for example, if the repo constans a 50MB csv file), some filters are applied before the regular expressions are matched:

• File size - If file is bigger than 1MB, ignore it but print a warning
• Extension - If extension is not allowed, ignore file but print a warning. (See NOTES to know why extension is used instead of mimetype)
• Base64 - If file contains Base64 data, remove it. Many plain-text formats (such as Jupyter notebooks embed data in Base64 format. Applying regex to such files is never going to end)

check-repo works in a slightly different way, one obvious way to check git history is to checkout each commit and apply check-dir. That approach would be really slow since the script would be checking the same files many times. Instead, check-repo checks out the first commit, runs check-dir there and then, moves up one commit at a time and uses git diff to get only the difference between each consecutive pair of commits.

As in check-dir, the script applies some filters before applying regular expressions to prevent getting stuck on big files, note that in this case we are not dealing with files, but with the git diff output, and that prevents us to check for file size directly:

• Number of lines -
• Number of characters -
• Extension - If extension is not allowed, ignore file but print a warning. (See NOTES to know why extension is used instead of mimetype)
• Base64 - Remove Base64 code.

The project has some limitations see NOTES file for information regarding the design of the project and how that limits what the library is able to detect.

##Installation

    pip install git+git://github.com/dssg/repo-scraper.git -r requirements.txt

##Dependencies

• glob2
• nose (optional, for running tests)

##Tested with

• Python 2.7.10
• Git 2.6.0

##Usage

    cd path/to/your/project
    check-dir

See help for more options available:

    check-dir --help

###Using a IGNORE file with check-dir

Just as with git, you can specify a file to make the program ignore some files/folders. This is specially useful when you have folder with many log files that you are sure do not have sensitive data. The library assumes one glob rule per line.

Adding a IGNORE file will make execution faster, since many regular expressions are matched against all files that have certain characteristics.

Important: Even though the format is very similar, you cannot use the same rules as in your .gitignore file. For more details, see this.

##What's done

• Passwords (using regex). See test_password_check.py
• IPs
• URLs on amazonaws.com (it's simple to add more domains if needed)

##What's missing

• URLs
• Check other branches apart from master

#TODO

• Come up with a cool name