Linux – What are the correct permissions for the .gnupg enclosing folder? gpg: WARNING: unsafe enclosing directory permissions on configuration file

encryptiongnupglinuxpermissions

I don't want to just chmod and run until I get the right answer, nor do I want to run GnuPG as root. The easy fix would be to just set it so that only my user can read it, but I don't think that's the best way.

I get the following error when I attempt to use gpg: 

gpg: WARNING: unsafe enclosing directory permissions on configuration file `/home/nb/.gnupg/gpg.conf'
gpg: external program calls are disabled due to unsafe options file permissions
gpg: keyserver communications error: general error
gpg: keyserver receive failed: general error

GnuPG's ~/.gnupg/ current status: 

% stat .gnupg 
  File: ‘.gnupg’
  Size: 4096        Blocks: 8          IO Block: 4096   directory
Device: 1bh/27d Inode: 20578751    Links: 3
Access: (0775/drwxrwxr-x)  Uid: ( 1000/      nb)   Gid: ( 1000/      XXXX)
Access: 2015-08-09 18:14:45.937760752 -0700
Modify: 2015-08-05 20:54:32.860883569 -0700
Change: 2015-08-05 20:54:32.860883569 -0700
 Birth: -

The answer at the following link advises 600 permissions for the ~/gnupg/gpg.conf file, but does the enclosing folder require those permissions, too?

https://askubuntu.com/questions/330755/unsafe-permissions-on-configuration-file-home-david-gnupg-gpg-conf-what-doe

Best Answer

Yes, you will also need to fix the permissions of the enclosing directory ~/.gnupg

Because an attacker with enough rights on the folder could manipulate folder contents.

Execute the following commands:

  1. Make sure, the folder+contents belong to you:
    chown -R $(whoami) ~/.gnupg/

  2. Correct access rights for .gnupg and subfolders:
    find ~/.gnupg -type f -exec chmod 600 {} \;
    find ~/.gnupg -type d -exec chmod 700 {} \;

Explanation for 600, 700:

Lets start from the back: '00' mean NO rights AT ALL for everybody who is not the owner of the files/directories.

That means, that the process reading these (gnupg) must run as the owner of these files/directories.

~/.gnupg/ is a folder, the process reading the contents must be able to "enter" (=execute) this folder. This is the "x" Bit. It has the value "1". 7 - 6 = 1

Both ~/.gnupg/ and ~/.gnupg/* you want to be able to read and write, thats 4 + 2 = 6.

==> Only the owner of the files can read/write them now (=600). Only he can enter into the directory as well (=700)

==> These file rights don't "need" to be documented, they are derivable from the intended usage.

More info about permission notation: https://en.wikipedia.org/wiki/File_system_permissions#Notation_of_traditional_Unix_permissions

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