eric6/Plugins/CheckerPlugins/CodeStyleChecker/Security/Checks/generalFilePermissions.py

# -*- coding: utf-8 -*-

# Copyright (c) 2020 - 2021 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing a check for setting too permissive file permissions.
"""

#
# This is a modified version of the one found in the bandit package.
#
# Original Copyright 2014 Hewlett-Packard Development Company, L.P.
#
# SPDX-License-Identifier: Apache-2.0
#

import stat


def getChecks():
    """
    Public method to get a dictionary with checks handled by this module.
    
    @return dictionary containing checker lists containing checker function and
        list of codes
    @rtype dict
    """
    return {
        "Call": [
            (checkFilePermissions, ("S102",)),
        ],
    }


def checkFilePermissions(reportError, context, config):
    """
    Function to check for setting too permissive file permissions.
    
    @param reportError function to be used to report errors
    @type func
    @param context security context object
    @type SecurityContext
    @param config dictionary with configuration data
    @type dict
    """
    if (
        'chmod' in context.callFunctionName and
        context.callArgsCount == 2
    ):
        mode = context.getCallArgAtPosition(1)
        
        if (
            mode is not None and
            isinstance(mode, int) and
            (mode & stat.S_IWOTH or mode & stat.S_IXGRP)
        ):
            # world writable is an HIGH, group executable is a MEDIUM
            if mode & stat.S_IWOTH:
                severity = "H"
            else:
                severity = "M"
            
            filename = context.getCallArgAtPosition(0)
            if filename is None:
                filename = 'NOT PARSED'
            
            reportError(
                context.node.lineno - 1,
                context.node.col_offset,
                "S103",
                severity,
                "H",
                oct(mode),
                filename
            )