* gnu/services/opensnitch.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add reference to it.
* doc/guix.texi (Miscellaneous Services, Security): Document it.
* gnu/tests/security.scm (%test-opensnitch): New variable.
Change-Id: I63d1b6636b3aaecf399664ec97383d82ff1391d1