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Chapter 2. General Network Security > Providing File and Directory Access

Providing File and Directory Access

One of the most basic and critical pieces of security for a computer system is the granting of access to files and directories. The data you use, the programs you run, and indeed the operating system itself are all stored in files and directories. Unless these objects are secure, the rest of your system security is in jeopardy. When set properly, file and directory permissions are the cornerstone of the system’s security. You must make a lot of decisions when you think about setting permissions on files and directories, but first we should talk about what permissions can be set and what they mean. Following is a list of file permissions and their definitions.

  • Traverse Folder/Execute File: Allows running of executable files and referring to other files in the current directory

  • List Folder/Read Data: Allows reading of file or folder contents

  • Read Attributes: Allows reading of file attributes

  • Read Extended Attributes: Allows reading of extended file attributes

  • Create Files/Write Data: Allows write access to files and folders

  • Create Folders/Append Data: Allows folder creation and append access to files

  • Write Attributes: Allows writing of attributes

  • Write Extended Attributes: Allows writing of extended attributes

  • Delete Subfolders and Files: Allows deletion of child folders and files (files in subdirectories or subfolders)

  • Delete: Allows deletion of files or folders

  • Read Permissions: Allows reading of the Access Control List (ACL)

  • Change Permission: Allows changing of the ACL on files or folders

  • Take Ownership: Allows taking of ownership of files or folders



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