audit_submit(3) Library Functions Manual audit_submit(3)

audit_submit — general purpose audit record submission

Basic Security Module Library (libbsm, -lbsm)

<bsm/libbsm.h> int (short au_event, au_id_t auid, char status, int reterr, const char * restrict format, ...);

The () function provides a generic programming interface for audit record submission. This audit record will contain a header, subject token, an optional text token, return token, and a trailer. The header will contain the event class specified by au_event. The subject token will be generated based on auid. The return token is dependent on the status and reterr arguments; unlike the argument to au_to_return, reterr should be a local rather than BSM error number. Optionally, a text token will be created as a part of this record.

Text token output is under the control of a format string that specifies how subsequent arguments (or arguments accessed via the variable-length argument facilities of stdarg(3)) are converted for output. If format is NULL, then no text token is created in the audit record.

It should be noted that () assumes that setaudit(2), or setaudit_addr(2) has already been called. As a direct result, the terminal ID for the subject will be retrieved from the kernel via getaudit(2), or getaudit_addr(2).

#include <bsm/audit.h>
#include <bsm/libbsm.h>
#include <bsm/audit_uevents.h>

#include <stdio.h>
#include <stdarg.h>
#include <errno.h>

void
audit_bad_su(char *from_login, char *to_login)
{
	struct auditinfo_addr aia;
	struct auditinfo ai;
	au_id_t aid;
	int error;

	error = getaudit_addr(&aia, sizeof(aia));
	if (error < 0 && errno == ENOSYS) {
		error = getaudit(&ai);
		if (error < 0)
			err(1, "getaudit");
		aid = ai.ai_auid;
	} else if (error < 0)
		err(1, "getaudit_addr");
	else
		aid = aia.ai_auid;
	error = audit_submit(AUE_su, aid, EPERM, 1,
	    "bad su from %s to %s", from_login, to_login);
	if (error != 0)
		err(1, "audit_submit");
}

Will generate the following audit record:

header,94,1,su(1),0,Mon Apr 17 23:23:59 2006, + 271 msec
subject,root,root,wheel,root,wheel,652,652,0,0.0.0.0
text,bad su from from csjp to root
return,failure : Operation not permitted,1
trailer,94

If successful, audit_submit will return zero. Otherwise a -1 is returned and the global variable errno is set to indicate the error.

auditon(2), getaudit(2), libbsm(3), stdarg(3)

The audit_submit() function first appeared in OpenBSM version 1.0. OpenBSM 1.0 was introduced in FreeBSD 7.0.

The audit_submit() function was written by Christian S.J. Peron ⟨csjp@FreeBSD.org⟩.

January 18, 2008 macOS 15.0