53ca19a3b3
- Separate the suser part of the bsd44 secmodel into its own secmodel
and directory, pending even more cleanups. For revision history
purposes, the original location of the files was
src/sys/secmodel/bsd44/secmodel_bsd44_suser.c
src/sys/secmodel/bsd44/suser.h
- Add a man-page for secmodel_suser(9) and update the one for
secmodel_bsd44(9).
- Add a "secmodel" module class and use it. Userland program and
documentation updated.
- Manage secmodel count (nsecmodels) through the module framework.
This eliminates the need for secmodel_{,de}register() calls in
secmodel code.
- Prepare for secmodel modularization by adding relevant module bits.
The secmodels don't allow auto unload. The bsd44 secmodel depends
on the suser and securelevel secmodels. The overlay secmodel depends
on the bsd44 secmodel. As the module class is only cosmetic, and to
prevent ambiguity, the bsd44 and overlay secmodels are prefixed with
"secmodel_".
- Adapt the overlay secmodel to recent changes (mainly vnode scope).
- Stop using link-sets for the sysctl node(s) creation.
- Keep sysctl variables under nodes of their relevant secmodels. In
other words, don't create duplicates for the suser/securelevel
secmodels under the bsd44 secmodel, as the latter is merely used
for "grouping".
- For the suser and securelevel secmodels, "advertise presence" in
relevant sysctl nodes (sysctl.security.models.{suser,securelevel}).
- Get rid of the LKM preprocessor stuff.
- As secmodels are now modules, there's no need for an explicit call
to secmodel_start(); it's handled by the module framework. That
said, the module framework was adjusted to properly load secmodels
early during system startup.
- Adapt rump to changes: Instead of using empty stubs for securelevel,
simply use the suser secmodel. Also replace secmodel_start() with a
call to secmodel_suser_start().
- 5.99.20.
Testing was done on i386 ("release" build). Spearated module_init()
changes were tested on sparc and sparc64 as well by martin@ (thanks!).
Mailing list reference:
http://mail-index.netbsd.org/tech-kern/2009/09/25/msg006135.html
411 lines
10 KiB
C
411 lines
10 KiB
C
/* $NetBSD: secmodel_overlay.c,v 1.10 2009/10/02 18:50:13 elad Exp $ */
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/*-
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* Copyright (c) 2006 Elad Efrat <elad@NetBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: secmodel_overlay.c,v 1.10 2009/10/02 18:50:13 elad Exp $");
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/kauth.h>
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#include <sys/module.h>
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#include <sys/sysctl.h>
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#include <secmodel/overlay/overlay.h>
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#include <secmodel/bsd44/bsd44.h>
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#include <secmodel/suser/suser.h>
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#include <secmodel/securelevel/securelevel.h>
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MODULE(MODULE_CLASS_SECMODEL, secmodel_overlay, "secmodel_bsd44");
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/*
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* Fall-back settings.
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*/
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#define OVERLAY_ISCOPE_GENERIC "org.netbsd.kauth.overlay.generic"
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#define OVERLAY_ISCOPE_SYSTEM "org.netbsd.kauth.overlay.system"
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#define OVERLAY_ISCOPE_PROCESS "org.netbsd.kauth.overlay.process"
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#define OVERLAY_ISCOPE_NETWORK "org.netbsd.kauth.overlay.network"
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#define OVERLAY_ISCOPE_MACHDEP "org.netbsd.kauth.overlay.machdep"
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#define OVERLAY_ISCOPE_DEVICE "org.netbsd.kauth.overlay.device"
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#define OVERLAY_ISCOPE_VNODE "org.netbsd.kauth.overlay.vnode"
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static kauth_scope_t secmodel_overlay_iscope_generic;
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static kauth_scope_t secmodel_overlay_iscope_system;
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static kauth_scope_t secmodel_overlay_iscope_process;
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static kauth_scope_t secmodel_overlay_iscope_network;
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static kauth_scope_t secmodel_overlay_iscope_machdep;
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static kauth_scope_t secmodel_overlay_iscope_device;
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static kauth_scope_t secmodel_overlay_iscope_vnode;
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static kauth_listener_t l_generic, l_system, l_process, l_network, l_machdep,
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l_device, l_vnode;
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static struct sysctllog *sysctl_overlay_log;
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/*
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* Initialize the overlay security model.
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*/
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void
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secmodel_overlay_init(void)
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{
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/*
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* Register internal fall-back scopes.
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*/
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secmodel_overlay_iscope_generic = kauth_register_scope(
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OVERLAY_ISCOPE_GENERIC, NULL, NULL);
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secmodel_overlay_iscope_system = kauth_register_scope(
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OVERLAY_ISCOPE_SYSTEM, NULL, NULL);
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secmodel_overlay_iscope_process = kauth_register_scope(
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OVERLAY_ISCOPE_PROCESS, NULL, NULL);
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secmodel_overlay_iscope_network = kauth_register_scope(
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OVERLAY_ISCOPE_NETWORK, NULL, NULL);
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secmodel_overlay_iscope_machdep = kauth_register_scope(
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OVERLAY_ISCOPE_MACHDEP, NULL, NULL);
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secmodel_overlay_iscope_device = kauth_register_scope(
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OVERLAY_ISCOPE_DEVICE, NULL, NULL);
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secmodel_overlay_iscope_vnode = kauth_register_scope(
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OVERLAY_ISCOPE_VNODE, NULL, NULL);
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/*
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* Register fall-back listeners, from suser and securelevel, to each
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* internal scope.
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*/
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kauth_listen_scope(OVERLAY_ISCOPE_GENERIC,
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secmodel_suser_generic_cb, NULL);
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kauth_listen_scope(OVERLAY_ISCOPE_SYSTEM,
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secmodel_suser_system_cb, NULL);
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kauth_listen_scope(OVERLAY_ISCOPE_SYSTEM,
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secmodel_securelevel_system_cb, NULL);
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kauth_listen_scope(OVERLAY_ISCOPE_PROCESS,
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secmodel_suser_process_cb, NULL);
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kauth_listen_scope(OVERLAY_ISCOPE_PROCESS,
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secmodel_securelevel_process_cb, NULL);
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kauth_listen_scope(OVERLAY_ISCOPE_NETWORK,
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secmodel_suser_network_cb, NULL);
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kauth_listen_scope(OVERLAY_ISCOPE_NETWORK,
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secmodel_securelevel_network_cb, NULL);
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kauth_listen_scope(OVERLAY_ISCOPE_MACHDEP,
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secmodel_suser_machdep_cb, NULL);
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kauth_listen_scope(OVERLAY_ISCOPE_MACHDEP,
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secmodel_securelevel_machdep_cb, NULL);
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kauth_listen_scope(OVERLAY_ISCOPE_DEVICE,
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secmodel_suser_device_cb, NULL);
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kauth_listen_scope(OVERLAY_ISCOPE_DEVICE,
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secmodel_securelevel_device_cb, NULL);
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secmodel_bsd44_init();
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}
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void
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sysctl_security_overlay_setup(struct sysctllog **clog)
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{
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const struct sysctlnode *rnode;
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sysctl_createv(clog, 0, NULL, &rnode,
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CTLFLAG_PERMANENT,
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CTLTYPE_NODE, "security", NULL,
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NULL, 0, NULL, 0,
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CTL_SECURITY, CTL_EOL);
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sysctl_createv(clog, 0, &rnode, &rnode,
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CTLFLAG_PERMANENT,
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CTLTYPE_NODE, "models", NULL,
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NULL, 0, NULL, 0,
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CTL_CREATE, CTL_EOL);
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sysctl_createv(clog, 0, &rnode, &rnode,
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CTLFLAG_PERMANENT,
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CTLTYPE_NODE, "overlay",
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SYSCTL_DESCR("Overlay security model on-top of bsd44, "),
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NULL, 0, NULL, 0,
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CTL_CREATE, CTL_EOL);
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sysctl_createv(clog, 0, &rnode, NULL,
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CTLFLAG_PERMANENT,
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CTLTYPE_STRING, "name", NULL,
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NULL, 0, __UNCONST("Overlay (on-top of bsd44)"), 0,
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CTL_CREATE, CTL_EOL);
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}
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/*
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* Start the overlay security model.
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*/
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void
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secmodel_overlay_start(void)
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{
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l_generic = kauth_listen_scope(KAUTH_SCOPE_GENERIC,
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secmodel_overlay_generic_cb, NULL);
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l_system = kauth_listen_scope(KAUTH_SCOPE_SYSTEM,
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secmodel_overlay_system_cb, NULL);
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l_process = kauth_listen_scope(KAUTH_SCOPE_PROCESS,
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secmodel_overlay_process_cb, NULL);
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l_network = kauth_listen_scope(KAUTH_SCOPE_NETWORK,
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secmodel_overlay_network_cb, NULL);
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l_machdep = kauth_listen_scope(KAUTH_SCOPE_MACHDEP,
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secmodel_overlay_machdep_cb, NULL);
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l_device = kauth_listen_scope(KAUTH_SCOPE_DEVICE,
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secmodel_overlay_device_cb, NULL);
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l_vnode = kauth_listen_scope(KAUTH_SCOPE_VNODE,
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secmodel_overlay_vnode_cb, NULL);
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/* secmodel_register(); */
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}
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/*
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* Stop the overlay security model.
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*/
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void
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secmodel_overlay_stop(void)
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{
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kauth_unlisten_scope(l_generic);
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kauth_unlisten_scope(l_system);
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kauth_unlisten_scope(l_process);
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kauth_unlisten_scope(l_network);
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kauth_unlisten_scope(l_machdep);
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kauth_unlisten_scope(l_device);
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kauth_unlisten_scope(l_vnode);
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}
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static int
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secmodel_overlay_modcmd(modcmd_t cmd, void *arg)
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{
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int error = 0;
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switch (cmd) {
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case MODULE_CMD_INIT:
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secmodel_overlay_init();
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secmodel_bsd44_stop();
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secmodel_overlay_start();
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sysctl_security_overlay_setup(&sysctl_overlay_log);
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break;
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case MODULE_CMD_FINI:
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sysctl_teardown(&sysctl_overlay_log);
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secmodel_overlay_stop();
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break;
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case MODULE_CMD_AUTOUNLOAD:
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error = EPERM;
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break;
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default:
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error = ENOTTY;
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break;
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}
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return error;
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}
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/*
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* Overlay listener for the generic scope.
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*/
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int
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secmodel_overlay_generic_cb(kauth_cred_t cred, kauth_action_t action,
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void *cookie, void *arg0, void *arg1, void *arg2, void *arg3)
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{
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int result;
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result = KAUTH_RESULT_DEFER;
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switch (action) {
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default:
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result = KAUTH_RESULT_DEFER;
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break;
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}
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if (result == KAUTH_RESULT_DEFER) {
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result = kauth_authorize_action(
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secmodel_overlay_iscope_generic, cred, action,
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arg0, arg1, arg2, arg3);
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}
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return (result);
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}
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/*
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* Overlay listener for the system scope.
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*/
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int
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secmodel_overlay_system_cb(kauth_cred_t cred, kauth_action_t action,
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void *cookie, void *arg0, void *arg1, void *arg2, void *arg3)
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{
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int result;
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result = KAUTH_RESULT_DEFER;
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switch (action) {
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default:
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result = KAUTH_RESULT_DEFER;
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break;
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}
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if (result == KAUTH_RESULT_DEFER) {
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result = kauth_authorize_action(
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secmodel_overlay_iscope_system, cred, action,
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arg0, arg1, arg2, arg3);
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}
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return (result);
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}
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/*
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* Overlay listener for the process scope.
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*/
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int
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secmodel_overlay_process_cb(kauth_cred_t cred, kauth_action_t action,
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void *cookie, void *arg0, void *arg1, void *arg2, void *arg3)
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{
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int result;
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result = KAUTH_RESULT_DEFER;
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switch (action) {
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default:
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result = KAUTH_RESULT_DEFER;
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break;
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}
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if (result == KAUTH_RESULT_DEFER) {
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result = kauth_authorize_action(
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secmodel_overlay_iscope_process, cred, action,
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arg0, arg1, arg2, arg3);
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}
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return (result);
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}
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/*
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* Overlay listener for the network scope.
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*/
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int
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secmodel_overlay_network_cb(kauth_cred_t cred, kauth_action_t action,
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void *cookie, void *arg0, void *arg1, void *arg2, void *arg3)
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{
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int result;
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result = KAUTH_RESULT_DEFER;
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switch (action) {
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default:
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result = KAUTH_RESULT_DEFER;
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break;
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}
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if (result == KAUTH_RESULT_DEFER) {
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result = kauth_authorize_action(
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secmodel_overlay_iscope_network, cred, action,
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arg0, arg1, arg2, arg3);
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}
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return (result);
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}
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/*
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* Overlay listener for the machdep scope.
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*/
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int
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secmodel_overlay_machdep_cb(kauth_cred_t cred, kauth_action_t action,
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void *cookie, void *arg0, void *arg1, void *arg2, void *arg3)
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{
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int result;
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result = KAUTH_RESULT_DEFER;
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switch (action) {
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default:
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result = KAUTH_RESULT_DEFER;
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break;
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}
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if (result == KAUTH_RESULT_DEFER) {
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result = kauth_authorize_action(
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secmodel_overlay_iscope_machdep, cred, action,
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arg0, arg1, arg2, arg3);
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}
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return (result);
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}
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/*
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* Overlay listener for the device scope.
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*/
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int
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secmodel_overlay_device_cb(kauth_cred_t cred, kauth_action_t action,
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void *cookie, void *arg0, void *arg1, void *arg2, void *arg3)
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{
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int result;
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result = KAUTH_RESULT_DEFER;
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switch (action) {
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default:
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result = KAUTH_RESULT_DEFER;
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break;
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}
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if (result == KAUTH_RESULT_DEFER) {
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result = kauth_authorize_action(
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secmodel_overlay_iscope_device, cred, action,
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arg0, arg1, arg2, arg3);
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}
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return (result);
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}
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/*
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* Overlay listener for the vnode scope.
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*/
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int
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secmodel_overlay_vnode_cb(kauth_cred_t cred, kauth_action_t action,
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void *cookie, void *arg0, void *arg1, void *arg2, void *arg3)
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{
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int result;
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result = KAUTH_RESULT_DEFER;
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switch (action) {
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default:
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result = KAUTH_RESULT_DEFER;
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break;
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}
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if (result == KAUTH_RESULT_DEFER) {
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result = kauth_authorize_action(
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secmodel_overlay_iscope_vnode, cred, action,
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arg0, arg1, arg2, arg3);
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}
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return (result);
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}
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