Introduce support for Mandatory Access Control and extensible

kernel access control.

Modify procfs so that (when mounted multilabel) it exports process MAC
labels as the vnode labels of procfs vnodes associated with processes.

Approved by:	des
Obtained from:	TrustedBSD Project
Sponsored by:	DARPA, NAI Labs

3 files changed, 72 insertions, 0 deletions

diff --git a/sys/fs/procfs/procfs.c b/sys/fs/procfs/procfs.c
index 8083ba6..d91d23e 100644
--- a/sys/fs/procfs/procfs.c
+++ b/sys/fs/procfs/procfs.c
@@ -153,6 +153,7 @@ procfs_init(PFS_INIT_ARGS)
 	
 	dir = pfs_create_dir(root, "pid",
 	    &procfs_attr, NULL, PFS_PROCDEP);
+	dir->pn_refreshlabel = &procfs_piddir_refreshlabel;
 	pfs_create_file(dir, "cmdline", &procfs_doproccmdline,
 	    NULL, NULL, PFS_RD);
 	pfs_create_file(dir, "ctl", &procfs_doprocctl,
diff --git a/sys/fs/procfs/procfs.h b/sys/fs/procfs/procfs.h
index 4baaf50..61f6e954 100644
--- a/sys/fs/procfs/procfs.h
+++ b/sys/fs/procfs/procfs.h
@@ -61,6 +61,9 @@ int	 procfs_close(PFS_CLOSE_ARGS);
 /* Attributes */
 int	 procfs_attr(PFS_ATTR_ARGS);
 
+/* MAC */
+int	procfs_piddir_refreshlabel(PFS_REFRESHLABEL_ARGS);
+
 /* Visibility */
 int	 procfs_notsystem(PFS_VIS_ARGS);
 int	 procfs_candebug(PFS_VIS_ARGS);
diff --git a/sys/fs/procfs/procfs_mac.c b/sys/fs/procfs/procfs_mac.c
new file mode 100644
index 0000000..ea5c9f5
--- /dev/null
+++ b/sys/fs/procfs/procfs_mac.c
@@ -0,0 +1,68 @@
+/*-
+ * Copyright (c) 2002 Network Associates Technology, Inc.
+ * All rights reserved.
+ *
+ * This software was developed in part by NAI Labs, the Security Research
+ * Division of Network Associates, Inc. under DARPA/SPAWAR contract
+ * N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS research program.
+ *
+ * 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.
+ * 3. The names of the authors may not be used to endorse or promote
+ *    products derived from this software without specific prior written
+ *    permission.
+ *
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+#include "opt_mac.h"
+
+#include <sys/param.h>
+#include <sys/lock.h>
+#include <sys/mac.h>
+#include <sys/mount.h>
+#include <sys/mutex.h>
+#include <sys/proc.h>
+#include <sys/systm.h>
+#include <sys/ucred.h>
+#include <sys/vnode.h>
+
+#include <fs/pseudofs/pseudofs.h>
+#include <fs/procfs/procfs.h>
+
+int
+procfs_piddir_refreshlabel(PFS_REFRESHLABEL_ARGS)
+{
+#ifdef MAC
+
+	if (p == NULL)
+		mac_update_vnode_from_mount(vp, vp->v_mount);
+	else {
+		PROC_LOCK(p);
+		mac_update_procfsvnode(vp, p->p_ucred);
+		PROC_UNLOCK(p);
+	}
+
+	return (0);
+#else
+	return (EOPNOTSUPP);
+#endif
+}