WildFly Elytron

WildFly Elytron

Encrypting Pre-Existing Filesystem realms


With the addition of the filesystem realm encryption feature outlined here, a feature was added to the Elytron Tool to encrypt a pre-existing filesystem realm.

Method to run the tool

There are two methods to run the tool, one is on the command line, that only lets you apply encryption to one filesystem realm at a time, and the other way is to use a descriptor file which allows you to convert multiple filesystem realms at the same time.

Regardless of the method you choose, there are certain options that only work on the command line outlined below

  • --help: Get help with usage of this command

  • --debug: Print stack trace when error occurs.

  • --silent: Suppresses all output except errors and prompts.

  • --summary: Provides a detailed summary of all operations performed, once the command finishes.

The example command would be run like the following

$ WILDFLY_HOME/bin/elytron-tool.sh filesystem-encrypt --help
In the following post, replace WILDFLY_HOME with the actual path to your WildFly installation.

The following options are required for both methods:

  • --input-location: The absolute or relative location of the original filesystem realm.

  • --output-location: The directory where the new filesystem realm resides.

The following options are optional for both methods, and have their defaults listed:

  • --realm-name: The name of the new filesystem-realm (default: encrypted-filesystem-realm).

  • --credential-store: The relative or absolute path to the credential store file that contains the secret key (default: OUTPUT_LOCATION/mycredstore.cs).

  • --secret-key: The alias of the secret key stored in the credential store file (default: key).

  • --hash-encoding: The hash encoding used in the original filesystem realm (default: BASE64).

  • --hash-charset: The hash charset used in the original filesystem realm (default: UTF-8).

  • --encoded: If the original realm has encoded set to true (default: true).

  • --levels: The levels used in the original filesystem realm (default: 2).

Command Line

To run in command line mode, specify the 2 mandatory options, and any optional ones applicable to your use case. For example:

$ WILDFLY_HOME/bin/elytron-tool.sh filesystem-encrypt --input-location fs-unencrypted-realm --output-location fs-encrypted-realm --realm-name new-realm --encoded false --levels 4 --hash-encoding HEX

This command will encrypt a filesystem

  • Located at ./fs-unencrypted-realm

  • Encrypted to ./fs-encrypted-realm/new-realm

  • encoded in the original realm set to false

  • levels in the original realm set to 4

  • hash-encoding used in the orignal realm set to HEX

Bulk Convert

A descriptor file will allow you to convert multiple realms all at once from unencrypted to encrypted filesystem realms. To do this you will create a file in a specific format. Enter all the filesystem-encrypt options on a line with a : after with the value you want to set it to. To seperate realms, leave a blank line between the blocks. For example, if you wanted to encrypt 4 realms, the below file could be created. Here it shows setting different levels, hash-charsets, and hash-encodings in the realms.

This filename is bulk-encryption-conversion-desc.





To make use of this descriptor file, the following command would be run:

$ WILDFLY_HOME/bin/elytron-tool.sh filesystem-encrypt --bulk-convert ./bulk-encryption-conversion-desc


This blog post has given an overview on how to encrypt a filesystem realm that was previously configured without encryption for both command line mode and bulk convert mode.