--- /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@
+ */
+#include <sys/param.h>
+#include <sys/vnode.h>
+#include <sys/vnode_internal.h>
+#include <sys/kauth.h>
+#include <sys/namei.h>
+#include <sys/mount.h>
+#include <sys/mount_internal.h>
+#include <sys/uio_internal.h>
+#include <sys/xattr.h>
+
+#include <security/mac_internal.h>
+
+/*
+ * Caller holds reference or sets VNODE_LABEL_NEEDREF to non-zero.
+ *
+ * Function will drop lock and reference on return.
+ */
+int
+vnode_label(struct mount *mp, struct vnode *dvp, struct vnode *vp,
+ struct componentname *cnp, int flags, vfs_context_t ctx)
+{
+ int error;
+
+ error = 0;
+
+ vnode_lock(vp);
+
+ if (vp->v_lflag & VL_LABELED) {
+ if (!(flags & VNODE_LABEL_NEEDREF))
+ vnode_put_locked(vp);
+ vnode_unlock(vp);
+ return (0);
+ }
+
+ if ((flags & VNODE_LABEL_NEEDREF) && vnode_get_locked(vp)) {
+ vnode_unlock(vp);
+ return (ENOENT);
+ }
+
+ if ((vp->v_lflag & VL_LABEL) == 0) {
+ vp->v_lflag |= VL_LABEL;
+
+ /* Could sleep on disk I/O, drop lock. */
+ vnode_unlock(vp);
+ if (flags & VNODE_LABEL_CREATE)
+ error = mac_vnode_notify_create(ctx,
+ mp, dvp, vp, cnp);
+ else
+ error = mac_vnode_label_associate(mp, vp, ctx);
+ vnode_lock(vp);
+
+ if ((error == 0) && (vp->v_flag & VNCACHEABLE))
+ vp->v_lflag |= VL_LABELED;
+ vp->v_lflag &= ~VL_LABEL;
+
+ if (vp->v_lflag & VL_LABELWAIT) {
+ vp->v_lflag &= ~VL_LABELWAIT;
+ wakeup(vp->v_label);
+ }
+ vnode_put_locked(vp);
+ vnode_unlock(vp);
+ } else {
+ struct timespec ts;
+
+ ts.tv_sec = 10;
+ ts.tv_nsec = 0;
+
+ while (vp->v_lflag & VL_LABEL) {
+ vp->v_lflag |= VL_LABELWAIT;
+ error = msleep(vp->v_label, &vp->v_lock, PVFS|PDROP,
+ "vnode_label", &ts);
+ vnode_lock(vp);
+ if (error == EWOULDBLOCK) {
+ vprint("vnode label timeout", vp);
+ break;
+ }
+ }
+ /* XXX: what should be done if labeling failed (above)? */
+ vnode_put_locked(vp);
+ vnode_unlock(vp);
+ }
+
+ return (error);
+}
+
+
+/*
+ * Clear the "labeled" flag on a VNODE.
+ * VNODE will have label re-associated upon
+ * next call to lookup().
+ *
+ * Caller verifies vfs_flags(vnode_mount(vp)) & MNT_MULTILABEL
+ * Caller holds vnode lock.
+ */
+void
+vnode_relabel(struct vnode *vp)
+{
+
+ /* Wait for any other labeling to complete. */
+ while (vp->v_lflag & VL_LABEL) {
+ vp->v_lflag |= VL_LABELWAIT;
+ (void)msleep(vp->v_label, &vp->v_lock, PVFS, "vnode_relabel", 0);
+ }
+
+ /* Clear labeled flag */
+ vp->v_lflag &= ~VL_LABELED;
+
+ return;
+}
+
+/*
+ * VFS XATTR helpers.
+ */
+
+int
+mac_vnop_setxattr (struct vnode *vp, const char *name, char *buf, size_t len)
+{
+ vfs_context_t ctx;
+ int options = XATTR_NOSECURITY;
+ char uio_buf[ UIO_SIZEOF(1) ];
+ uio_t auio;
+ int error;
+
+ if (vfs_isrdonly(vp->v_mount))
+ return (EROFS);
+
+ ctx = vfs_context_current();
+ auio = uio_createwithbuffer(1, 0, UIO_SYSSPACE, UIO_WRITE,
+ &uio_buf[0], sizeof(uio_buf));
+ uio_addiov(auio, CAST_USER_ADDR_T(buf), len);
+
+ error = vn_setxattr(vp, name, auio, options, ctx);
+
+ return (error);
+}
+
+int
+mac_vnop_getxattr (struct vnode *vp, const char *name, char *buf, size_t len,
+ size_t *attrlen)
+{
+ vfs_context_t ctx = vfs_context_current();
+ int options = XATTR_NOSECURITY;
+ char uio_buf[ UIO_SIZEOF(1) ];
+ uio_t auio;
+ int error;
+
+ auio = uio_createwithbuffer(1, 0, UIO_SYSSPACE, UIO_READ,
+ &uio_buf[0], sizeof(uio_buf));
+ uio_addiov(auio, CAST_USER_ADDR_T(buf), len);
+
+ error = vn_getxattr(vp, name, auio, attrlen, options, ctx);
+ *attrlen = len - uio_resid(auio);
+
+ return (error);
+}
+
+int
+mac_vnop_removexattr (struct vnode *vp, const char *name)
+{
+ vfs_context_t ctx = vfs_context_current();
+ int options = XATTR_NOSECURITY;
+ int error;
+
+ if (vfs_isrdonly(vp->v_mount))
+ return (EROFS);
+
+ error = vn_removexattr(vp, name, options, ctx);
+
+ return (error);
+}
projects / apple / xnu.git / blobdiff