/*
* Copyright (c) 2008 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. The rights granted to you under the License
* may not be used to create, or enable the creation or redistribution of,
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
*
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
#include <mach/mach_types.h>
#include <mach/notify.h>
#include <ipc/ipc_port.h>
#include <kern/ipc_kobject.h>
#include <kern/audit_sessionport.h>
#include <libkern/OSAtomic.h>
#if CONFIG_AUDIT
/*
* audit_session_mksend
*
* Description: Obtain a send right for given audit session.
*
* Parameters: *aia_p Audit session information to assosiate with
* the new port.
* *sessionport Pointer to the current session port. This may
* actually be set to IPC_PORT_NULL.
*
* Returns: !NULL Resulting send right.
* NULL Failed to allocate port (due to lack of memory
* resources).
*
* Assumptions: Caller holds a reference on the session during the call.
* If there were no outstanding send rights against the port,
* hold a reference on the session and arm a new no-senders
* notification to determine when to release that reference.
* Otherwise, by creating an additional send right, we share
* the port's reference until all send rights go away.
*/
ipc_port_t
audit_session_mksend(struct auditinfo_addr *aia_p, ipc_port_t *sessionport)
{
audit_session_aiaref(aia_p);
if (!ipc_kobject_make_send_lazy_alloc_port(sessionport,
aia_p, IKOT_AU_SESSIONPORT, IPC_KOBJECT_ALLOC_NONE)) {
audit_session_aiaunref(aia_p);
}
return *sessionport;
}
/*
* audit_session_porttoaia
*
* Description: Obtain the audit session info associated with the given port.
*
* Parameters: port A Mach port.
*
* Returns: NULL The given Mach port did not reference audit
* session info.
* !NULL The audit session info that is associated with
* the Mach port.
*
* Notes: The caller must hold an outstanding send-right on the sessionport.
*/
struct auditinfo_addr *
audit_session_porttoaia(ipc_port_t port)
{
struct auditinfo_addr *aia_p = NULL;
if (IP_VALID(port)) {
aia_p = ipc_kobject_get_stable(port, IKOT_AU_SESSIONPORT);
}
return aia_p;
}
/*
* audit_session_no_senders
*
* Description: Handle a no-senders notification for a sessionport.
*
* Notes: It is possible that new send rights are created after a
* no-senders notification has been sent, but they will be protected
* by another aia reference.
*/
static void
audit_session_no_senders(ipc_port_t port, __unused mach_port_mscount_t mscount)
{
struct auditinfo_addr *aia_p = NULL;
aia_p = ipc_kobject_get_stable(port, IKOT_AU_SESSIONPORT);
assert(NULL != aia_p);
audit_session_aiaunref(aia_p);
}
/*
* audit_session_portdestroy
*
* Description: Destroy the kobject associated with the audit_session
*
* Notes: It is called when there is no outstanding references on the aia
* anymore (it also won't have any outstanding send rights)
*/
void
audit_session_portdestroy(ipc_port_t *sessionport)
{
ipc_port_t port = *sessionport;
*sessionport = IP_NULL;
if (IP_VALID(port)) {
ipc_kobject_dealloc_port(port, 0, IKOT_AU_SESSIONPORT);
}
}
IPC_KOBJECT_DEFINE(IKOT_AU_SESSIONPORT,
.iko_op_stable = true,
.iko_op_no_senders = audit_session_no_senders);
#endif /* CONFIG_AUDIT */