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CMakeLists.txt
CMakeLists.txt
 
 
README.md
README.md
 
 
contract.h
contract.h
 
 
gpgme.c
gpgme.c
 
 
gpgme.h
gpgme.h
 
 
keylist.c
keylist.c
 
 
keylist.h
keylist.h
 
 
testmod_gpgme.c
testmod_gpgme.c
 
 

README.md

  • infos = Information about gpgme plugin is in keys below
  • infos/author = Peter Nirschl peter.nirschl@gmail.com
  • infos/licence = BSD
  • infos/provides = crypto
  • infos/needs =
  • infos/recommends =
  • infos/placements = postgetstorage presetstorage
  • infos/status = unittest configurable memleak experimental unfinished
  • infos/metadata = crypto/encrypt gpg/binary
  • infos/description = Cryptographic operations wit GnuPG Made Easy (GPGME)

Introduction

The gpgme plugin is a filter plugin that enables users to encrypt values before they are persisted and to decrypt values after they have been read from a backend. The encryption and decryption is designed to work transparently.

The cryptographic operations are performed by GnuPG via the libgpgme library.

Installation

See installation. The package is called libelektra5-experimental.

Dependencies

  • libgpgme11 version 1.10 or later

Build Information

The plugin has been tested on Ubuntu 18.04 with libgpgme version 1.10.

Examples

You can mount the plugin like this:

kdb mount test.ecf /t gpgme "encrypt/key=DDEBEF9EE2DC931701338212DAF635B17F230E8D"

Now you can specify a key user:/t/a and protect its content by using:

kdb set user:/t/a
kdb meta-set user:/t/a crypt/encrypt 1
kdb set user:/t/a "secret"

The value of user:/t/a (for this example: "secret") will be stored encrypted. You can still access the original value by using kdb get:

kdb get user:/t/a

Configuration

GnuPG Keys

The GPG recipient keys can be specified in two ways:

  1. The GPG recipient key can be specified as encrypt/key directly.
  2. If you want to specify multiple keys, you can enumerate them under encrypt/key.

The following example illustrates how multiple GPG recipient keys can be specified:

encrypt/key/#0
encrypt/key/#1

Textmode

gpgme operates in textmode per default. In textmode the output of GPG is ASCII armored.

Textmode can be disabled by setting /gpgme/textmode to 0 in the plugin configuration.

Technical Details

Message Format

The encrypted values are valid PGP messages, that can be decrypted and read solely by the GnuPG binary without Elektra.