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The audit daemon controls the generation and location of audit trail files. If auditing is desired, auditd reads the audit_control(4) file to get a list of directories into which audit files can be written and the percentage limit for how much
space to reserve on each filesystem before changing to the next directory.
If auditd receives the signal SIGUSR1, the current audit file is closed and another is opened. If SIGHUP
is received, the current audit trail is closed, the audit_control file reread, and a new trail is opened. If SIGTERM is received, the audit trail
is closed and auditing is terminated. The program audit(1M) sends these signals and is recommended
for this purpose.
Each time the audit daemon opens a new audit trail file, it updates the file audit_data(4) to include the correct name.
Auditing Conditions
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The audit daemon invokes the program audit_warn(1M) under the following conditions
with the indicated options:
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audit_warn soft pathname
- The file system upon which pathname resides has exceeded the minimum free space limit defined in audit_control(4). A new audit trail has been opened on another file system.
-
audit_warn allsoft
- All available file systems have been filled beyond the minimum free space limit. A new audit trail has been opened
anyway.
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audit_warn hard pathname
- The file system upon which pathname resides has filled or for
some reason become unavailable. A new audit trail has been opened on another file system.
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audit_warn allhard count
- All available file systems have been filled or for some reason become unavailable. The audit
daemon will repeat this call to audit_warn every twenty seconds until space becomes available. count is the number of times that audit_warn
has been called since the problem arose.
-
audit_warn ebusy
- There is already an audit daemon running.
-
audit_warn tmpfile
- The file /etc/security/audit/audit_tmp exists, indicating a fatal error.
-
audit_warn nostart
- The internal system audit condition is AUC_FCHDONE. Auditing cannot be started without rebooting the system.
-
audit_warn auditoff
- The internal system audit condition has been changed to not be AUC_AUDITING by
someone other than the audit daemon. This causes the audit daemon to exit.
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audit_warn postsigterm
- An error occurred during the orderly shutdown of the auditing system.
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audit_warn getacdir
- There is a problem getting the directory list from /etc/security/audit/audit_control.
The audit daemon will hang in a sleep loop until this file is fixed.
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