--- /dev/null
+/*
+ * Copyright (c) 2007 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@
+ */
+/*-
+ * Copyright (c) 2005-2006 SPARTA, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <ipc/ipc_space.h>
+#include <ipc/ipc_port.h>
+#include <ipc/ipc_labelh.h>
+#include <kern/ipc_kobject.h>
+#include <mach/security.h>
+#include <security/mac_mach_internal.h>
+
+#if CONFIG_MACF_MACH
+zone_t ipc_labelh_zone;
+
+/*
+ * Create a new label handle in the task described by the specified space.
+ * The specified label is used in the label handle. The associated port
+ * name is copied out to namep and the task is granted send and receive rights.
+ */
+kern_return_t
+labelh_new_user(ipc_space_t space, struct label *inl, mach_port_name_t *namep)
+{
+ kern_return_t kr;
+ ipc_labelh_t lh;
+ ipc_entry_t entry;
+ ipc_port_t port;
+
+ if (space == IS_NULL || space->is_task == NULL)
+ return (KERN_INVALID_TASK);
+
+ /* XXX - perform entrypoint check here? */
+
+ /*
+ * Note: the calling task will have a receive right for the port.
+ * This is different from label handles that reference tasks
+ * where the kernel holds the receive right and the caller only
+ * gets a send right.
+ */
+ kr = ipc_port_alloc(space, namep, &port);
+ if (kr != KERN_SUCCESS)
+ return (kr);
+ ip_reference(port); /* ipc_port_alloc() does not add a reference */
+
+ /* Convert right to MACH_PORT_TYPE_SEND_RECEIVE */
+ port->ip_mscount++;
+ port->ip_srights++;
+ is_write_lock(space);
+ entry = ipc_entry_lookup(space, *namep);
+ if (entry != IE_NULL)
+ entry->ie_bits |= MACH_PORT_TYPE_SEND;
+ is_write_unlock(space);
+
+ /* Allocate new label handle, insert port and label. */
+ lh = (ipc_labelh_t)zalloc(ipc_labelh_zone);
+ lh_lock_init(lh);
+ lh->lh_port = port;
+ lh->lh_label = *inl;
+ lh->lh_type = LABELH_TYPE_USER;
+ lh->lh_references = 1; /* unused for LABELH_TYPE_USER */
+
+ /* Must call ipc_kobject_set() with port unlocked. */
+ ip_unlock(lh->lh_port);
+ ipc_kobject_set(lh->lh_port, (ipc_kobject_t)lh, IKOT_LABELH);
+
+ return (KERN_SUCCESS);
+}
+
+kern_return_t
+mac_label_new(ipc_space_t space, mach_port_name_t *namep, labelstr_t labelstr)
+{
+ struct label inl;
+ kern_return_t kr;
+
+ mac_task_label_init(&inl);
+ if (mac_task_label_internalize(&inl, labelstr))
+ return (KERN_INVALID_ARGUMENT);
+
+ kr = labelh_new_user(space, &inl, namep);
+ if (kr != KERN_SUCCESS) {
+ mac_task_label_destroy(&inl);
+ return (kr);
+ }
+
+ return (KERN_SUCCESS);
+}
+
+/*
+ * This function should be used to allocate label handles
+ * that are stored in other kernel objects, such as tasks.
+ * They must be released along with that object.
+ * The caller gets one reference, which can be applied to either the
+ * port or the ipc_label_t structure itself.
+ */
+ipc_labelh_t
+labelh_new(int canblock)
+{
+ ipc_labelh_t lh;
+
+ lh = (ipc_labelh_t)zalloc_canblock(ipc_labelh_zone, canblock);
+ lh_lock_init(lh);
+ lh->lh_port = ipc_port_alloc_kernel();
+ lh->lh_type = LABELH_TYPE_KERN;
+ lh->lh_references = 1;
+ ipc_kobject_set(lh->lh_port, (ipc_kobject_t)lh, IKOT_LABELH);
+
+ return (lh);
+}
+
+/*
+ * Call with old label handle locked.
+ * Returned label handle is unlocked.
+ */
+ipc_labelh_t
+labelh_duplicate(ipc_labelh_t old)
+{
+ ipc_labelh_t lh;
+
+ lh = labelh_new(0);
+ ip_lock(lh->lh_port);
+ mac_task_label_init(&lh->lh_label);
+ mac_task_label_copy(&old->lh_label, &lh->lh_label);
+ ip_unlock(lh->lh_port);
+ return (lh);
+}
+
+/*
+ * Call with old label handle locked.
+ * Returned label handle is locked.
+ */
+ipc_labelh_t
+labelh_modify(ipc_labelh_t old)
+{
+ ipc_labelh_t lh;
+
+ /*
+ * A label handle may only have a single reference.
+ * If there are no other references this is a no-op.
+ * Otherwise, make a copy we can write to and return it.
+ */
+ if (old->lh_references == 1)
+ return (old);
+ lh = labelh_duplicate(old);
+ lh_release(old);
+ lh_check_unlock(old);
+ lh_lock(lh);
+ return (lh);
+}
+
+/*
+ * Add or drop a reference on an (unlocked) label handle.
+ */
+ipc_labelh_t
+labelh_reference(ipc_labelh_t lh)
+{
+ lh_lock(lh);
+ lh_reference(lh);
+ lh_unlock(lh);
+ return (lh);
+}
+
+/*
+ * Release a reference on an (unlocked) label handle.
+ */
+void
+labelh_release(ipc_labelh_t lh)
+{
+ lh_lock(lh);
+ lh_release(lh);
+ lh_check_unlock(lh);
+}
+
+/*
+ * Deallocate space associated with the label handle backed by the
+ * specified port. For kernel-allocated label handles the
+ * label handle reference count should be 0. For user-allocated
+ * handles the ref count is not used (it was initialized to 1).
+ */
+void
+labelh_destroy(ipc_port_t port)
+{
+ ipc_labelh_t lh = (ipc_labelh_t) port->ip_kobject;
+
+ mac_task_label_destroy(&lh->lh_label);
+ zfree(ipc_labelh_zone, (vm_offset_t)lh);
+}
+#else
+kern_return_t
+mac_label_new(__unused ipc_space_t space,
+ __unused mach_port_name_t *namep,
+ __unused labelstr_t labelstr)
+{
+ return KERN_FAILURE;
+}
+#endif /* MAC_MACH */
projects / apple / xnu.git / blobdiff