78a117e6fa
(1) Abstract interpreter vnode labeling in execve(2) and mac_execve(2)
so that the general exec code isn't aware of the details of
allocating, copying, and freeing labels, rather, simply passes in
a void pointer to start and stop functions that will be used by
the framework. This change will be MFC'd.
(2) Introduce a new flags field to the MAC_POLICY_SET(9) interface
allowing policies to declare which types of objects require label
allocation, initialization, and destruction, and define a set of
flags covering various supported object types (MPC_OBJECT_PROC,
MPC_OBJECT_VNODE, MPC_OBJECT_INPCB, ...). This change reduces the
overhead of compiling the MAC Framework into the kernel if policies
aren't loaded, or if policies require labels on only a small number
or even no object types. Each time a policy is loaded or unloaded,
we recalculate a mask of labeled object types across all policies
present in the system. Eliminate MAC_ALWAYS_LABEL_MBUF option as it
is no longer required.
MFC after: 1 week ((1) only)
Reviewed by: csjp
Obtained from: TrustedBSD Project
Sponsored by: Apple, Inc.
346 lines
12 KiB
C
346 lines
12 KiB
C
/*-
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* Copyright (c) 1999-2002, 2006 Robert N. M. Watson
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* Copyright (c) 2001 Ilmar S. Habibulin
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* Copyright (c) 2001-2004 Networks Associates Technology, Inc.
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* Copyright (c) 2006 nCircle Network Security, Inc.
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* Copyright (c) 2006 SPARTA, Inc.
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* All rights reserved.
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*
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* This software was developed by Robert Watson and Ilmar Habibulin for the
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* TrustedBSD Project.
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*
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* This software was developed for the FreeBSD Project in part by Network
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* Associates Laboratories, the Security Research Division of Network
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* Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
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* as part of the DARPA CHATS research program.
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*
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* This software was developed by Robert N. M. Watson for the TrustedBSD
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* Project under contract to nCircle Network Security, Inc.
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*
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* This software was enhanced by SPARTA ISSO under SPAWAR contract
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* N66001-04-C-6019 ("SEFOS").
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _SECURITY_MAC_MAC_INTERNAL_H_
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#define _SECURITY_MAC_MAC_INTERNAL_H_
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#ifndef _KERNEL
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#error "no user-serviceable parts inside"
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#endif
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/*
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* MAC Framework sysctl namespace.
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*/
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#ifdef SYSCTL_DECL
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SYSCTL_DECL(_security_mac);
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#endif /* SYSCTL_DECL */
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/*
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* MAC Framework global types and typedefs.
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*/
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LIST_HEAD(mac_policy_list_head, mac_policy_conf);
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#ifdef MALLOC_DECLARE
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MALLOC_DECLARE(M_MACTEMP);
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#endif
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/*
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* MAC labels -- in-kernel storage format.
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*
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* In general, struct label pointers are embedded in kernel data structures
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* representing objects that may be labeled (and protected). Struct label is
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* opaque to both kernel services that invoke the MAC Framework and MAC
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* policy modules. In particular, we do not wish to encode the layout of the
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* label structure into any ABIs. Historically, the slot array contained
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* unions of {long, void} but now contains uintptr_t.
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*/
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#define MAC_MAX_SLOTS 4
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#define MAC_FLAG_INITIALIZED 0x0000001 /* Is initialized for use. */
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struct label {
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int l_flags;
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intptr_t l_perpolicy[MAC_MAX_SLOTS];
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};
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/*
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* MAC Framework global variables.
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*/
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extern struct mac_policy_list_head mac_policy_list;
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extern struct mac_policy_list_head mac_static_policy_list;
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extern uint64_t mac_labeled;
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extern struct mtx mac_ifnet_mtx;
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/*
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* MAC Framework infrastructure functions.
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*/
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int mac_error_select(int error1, int error2);
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void mac_policy_grab_exclusive(void);
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void mac_policy_assert_exclusive(void);
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void mac_policy_release_exclusive(void);
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void mac_policy_list_busy(void);
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int mac_policy_list_conditional_busy(void);
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void mac_policy_list_unbusy(void);
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struct label *mac_labelzone_alloc(int flags);
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void mac_labelzone_free(struct label *label);
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void mac_labelzone_init(void);
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void mac_init_label(struct label *label);
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void mac_destroy_label(struct label *label);
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int mac_check_structmac_consistent(struct mac *mac);
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int mac_allocate_slot(void);
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#define MAC_IFNET_LOCK(ifp) mtx_lock(&mac_ifnet_mtx)
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#define MAC_IFNET_UNLOCK(ifp) mtx_unlock(&mac_ifnet_mtx)
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/*
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* MAC Framework per-object type functions. It's not yet clear how the
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* namespaces, etc, should work for these, so for now, sort by object type.
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*/
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struct label *mac_cred_label_alloc(void);
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void mac_cred_label_free(struct label *label);
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struct label *mac_pipe_label_alloc(void);
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void mac_pipe_label_free(struct label *label);
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struct label *mac_socket_label_alloc(int flag);
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void mac_socket_label_free(struct label *label);
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struct label *mac_vnode_label_alloc(void);
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void mac_vnode_label_free(struct label *label);
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int mac_cred_check_relabel(struct ucred *cred, struct label *newlabel);
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int mac_cred_externalize_label(struct label *label, char *elements,
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char *outbuf, size_t outbuflen);
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int mac_cred_internalize_label(struct label *label, char *string);
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void mac_cred_relabel(struct ucred *cred, struct label *newlabel);
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struct label *mac_mbuf_to_label(struct mbuf *m);
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void mac_pipe_copy_label(struct label *src, struct label *dest);
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int mac_pipe_externalize_label(struct label *label, char *elements,
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char *outbuf, size_t outbuflen);
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int mac_pipe_internalize_label(struct label *label, char *string);
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int mac_socket_label_set(struct ucred *cred, struct socket *so,
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struct label *label);
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void mac_socket_copy_label(struct label *src, struct label *dest);
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int mac_socket_externalize_label(struct label *label, char *elements,
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char *outbuf, size_t outbuflen);
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int mac_socket_internalize_label(struct label *label, char *string);
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int mac_vnode_externalize_label(struct label *label, char *elements,
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char *outbuf, size_t outbuflen);
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int mac_vnode_internalize_label(struct label *label, char *string);
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void mac_vnode_check_mmap_downgrade(struct ucred *cred, struct vnode *vp,
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int *prot);
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int vn_setlabel(struct vnode *vp, struct label *intlabel,
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struct ucred *cred);
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/*
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* MAC_CHECK performs the designated check by walking the policy module list
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* and checking with each as to how it feels about the request. Note that it
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* returns its value via 'error' in the scope of the caller.
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*/
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#define MAC_CHECK(check, args...) do { \
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struct mac_policy_conf *mpc; \
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int entrycount; \
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\
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error = 0; \
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LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) { \
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if (mpc->mpc_ops->mpo_ ## check != NULL) \
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error = mac_error_select( \
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mpc->mpc_ops->mpo_ ## check (args), \
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error); \
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} \
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if ((entrycount = mac_policy_list_conditional_busy()) != 0) { \
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LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \
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if (mpc->mpc_ops->mpo_ ## check != NULL) \
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error = mac_error_select( \
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mpc->mpc_ops->mpo_ ## check (args), \
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error); \
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} \
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mac_policy_list_unbusy(); \
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} \
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} while (0)
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/*
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* MAC_GRANT performs the designated check by walking the policy module list
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* and checking with each as to how it feels about the request. Unlike
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* MAC_CHECK, it grants if any policies return '0', and otherwise returns
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* EPERM. Note that it returns its value via 'error' in the scope of the
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* caller.
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*/
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#define MAC_GRANT(check, args...) do { \
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struct mac_policy_conf *mpc; \
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int entrycount; \
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\
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error = EPERM; \
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LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) { \
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if (mpc->mpc_ops->mpo_ ## check != NULL) { \
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if (mpc->mpc_ops->mpo_ ## check(args) == 0) \
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error = 0; \
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} \
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} \
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if ((entrycount = mac_policy_list_conditional_busy()) != 0) { \
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LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \
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if (mpc->mpc_ops->mpo_ ## check != NULL) { \
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if (mpc->mpc_ops->mpo_ ## check (args) \
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== 0) \
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error = 0; \
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} \
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} \
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mac_policy_list_unbusy(); \
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} \
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} while (0)
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/*
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* MAC_BOOLEAN performs the designated boolean composition by walking the
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* module list, invoking each instance of the operation, and combining the
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* results using the passed C operator. Note that it returns its value via
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* 'result' in the scope of the caller, which should be initialized by the
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* caller in a meaningful way to get a meaningful result.
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*/
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#define MAC_BOOLEAN(operation, composition, args...) do { \
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struct mac_policy_conf *mpc; \
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int entrycount; \
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\
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LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) { \
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if (mpc->mpc_ops->mpo_ ## operation != NULL) \
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result = result composition \
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mpc->mpc_ops->mpo_ ## operation (args); \
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} \
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if ((entrycount = mac_policy_list_conditional_busy()) != 0) { \
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LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \
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if (mpc->mpc_ops->mpo_ ## operation != NULL) \
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result = result composition \
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mpc->mpc_ops->mpo_ ## operation \
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(args); \
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} \
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mac_policy_list_unbusy(); \
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} \
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} while (0)
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/*
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* MAC_EXTERNALIZE queries each policy to see if it can generate an
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* externalized version of a label element by name. Policies declare whether
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* they have matched a particular element name, parsed from the string by
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* MAC_EXTERNALIZE, and an error is returned if any element is matched by no
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* policy.
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*/
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#define MAC_EXTERNALIZE(type, label, elementlist, outbuf, \
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outbuflen) do { \
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int claimed, first, ignorenotfound, savedlen; \
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char *element_name, *element_temp; \
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struct sbuf sb; \
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\
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error = 0; \
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first = 1; \
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sbuf_new(&sb, outbuf, outbuflen, SBUF_FIXEDLEN); \
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element_temp = elementlist; \
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while ((element_name = strsep(&element_temp, ",")) != NULL) { \
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if (element_name[0] == '?') { \
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element_name++; \
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ignorenotfound = 1; \
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} else \
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ignorenotfound = 0; \
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savedlen = sbuf_len(&sb); \
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if (first) \
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error = sbuf_printf(&sb, "%s/", element_name); \
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else \
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error = sbuf_printf(&sb, ",%s/", element_name); \
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if (error == -1) { \
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error = EINVAL; /* XXX: E2BIG? */ \
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break; \
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} \
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claimed = 0; \
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MAC_CHECK(type ## _externalize_label, label, \
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element_name, &sb, &claimed); \
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if (error) \
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break; \
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if (claimed == 0 && ignorenotfound) { \
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/* Revert last label name. */ \
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sbuf_setpos(&sb, savedlen); \
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} else if (claimed != 1) { \
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error = EINVAL; /* XXX: ENOLABEL? */ \
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break; \
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} else { \
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first = 0; \
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} \
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} \
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sbuf_finish(&sb); \
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} while (0)
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/*
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* MAC_INTERNALIZE presents parsed element names and data to each policy to
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* see if any is willing to claim it and internalize the label data. If no
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* policies match, an error is returned.
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*/
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#define MAC_INTERNALIZE(type, label, instring) do { \
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char *element, *element_name, *element_data; \
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int claimed; \
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\
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error = 0; \
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element = instring; \
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while ((element_name = strsep(&element, ",")) != NULL) { \
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element_data = element_name; \
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element_name = strsep(&element_data, "/"); \
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if (element_data == NULL) { \
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error = EINVAL; \
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break; \
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} \
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claimed = 0; \
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MAC_CHECK(type ## _internalize_label, label, \
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element_name, element_data, &claimed); \
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if (error) \
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break; \
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if (claimed != 1) { \
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/* XXXMAC: Another error here? */ \
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error = EINVAL; \
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break; \
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} \
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} \
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} while (0)
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/*
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* MAC_PERFORM performs the designated operation by walking the policy module
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* list and invoking that operation for each policy.
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*/
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#define MAC_PERFORM(operation, args...) do { \
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struct mac_policy_conf *mpc; \
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int entrycount; \
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\
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LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) { \
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if (mpc->mpc_ops->mpo_ ## operation != NULL) \
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mpc->mpc_ops->mpo_ ## operation (args); \
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} \
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if ((entrycount = mac_policy_list_conditional_busy()) != 0) { \
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LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \
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if (mpc->mpc_ops->mpo_ ## operation != NULL) \
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mpc->mpc_ops->mpo_ ## operation (args); \
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} \
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mac_policy_list_unbusy(); \
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} \
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} while (0)
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#endif /* !_SECURITY_MAC_MAC_INTERNAL_H_ */
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