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OpenBSM is an open-source implementation of Sun's BSM event auditing file format and API. Originally created for Apple Computer by McAfee Research, OpenBSM is now maintained by volunteers and through the generous contributions of several organizations.

OpenBSM includes several command line tools, including auditreduce(8) and praudit(8) for reducing and printing audit trails, as well as the libbsm(3) library to manage configuration files, generate audit records, and parse and print audit trails. It also includes the auditd(8) audit configuration daemon, and the auditdistd(8) audit-trail distribution daemon.

Coupled with a kernel audit implementation, OpenBSM can be used to maintain system audit streams, and is a foundation for a full audit-enabled system. Portions of OpenBSM, including include files and token-building routines, are reusable in a kernel audit implementation, and may be found in the FreeBSD and macOS kernels.


OpenBSM consists of several directories:

bin/           Audit-related command line tools and daemons
bsm/           Library header files for BSM
compat/        Compatibility code to build on various operating systems
etc/           Sample /etc/security configuration files
libauditd/     Common audit management functions for auditd and launchd
libbsm/        Implementation of BSM library interfaces and man pages
man/           System call and configuration file man pages
m4/            Input files for m4 macro text processor 
modules/       Directory for auditfilterd module source
sys/           System header files for BSM
test/          Test token sets and geneneration program
tools/         Tool directory, including audump to dump databases

The following programs are included with OpenBSM:

audit          Command line audit control tool
auditd         Audit management daemon
auditdistd     Audit trail distribution daemon
auditfilterd   Experimental event monitoring framework
auditreduce    Audit trail reduction tool
audump         Debugging tool to parse and print audit databases
praudit        Tool to print audit trails

Build and Installation

Please see the file INSTALL for build and installation instructions.


The TrustedBSD Project would appreciate the contribution of bug fixes, enhancements, etc, under the same license found in the top-level LICENSE file. Please see the file CREDITS to learn more about who has contributed to the project.


Information on OpenBSM may be found on the OpenBSM home page:

Information on TrustedBSD may be found on the TrustedBSD home page: