da77b2fa6b
type, rather than "object_label" as the first argument. This reduces complexity a little for the consumer, and also makes it easier for use to rename the underlying entry points in struct mac_policy_obj. Obtained from: TrustedBSD Project Sponsored by: DARPA, Network Associates Laboratories
268 lines
9.1 KiB
C
268 lines
9.1 KiB
C
/*-
|
|
* Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson
|
|
* Copyright (c) 2001 Ilmar S. Habibulin
|
|
* Copyright (c) 2001, 2002, 2003 Networks Associates Technology, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This software was developed by Robert Watson and Ilmar Habibulin for the
|
|
* TrustedBSD Project.
|
|
*
|
|
* This software was developed for the FreeBSD Project in part by Network
|
|
* Associates Laboratories, 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.
|
|
*
|
|
* 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/*
|
|
* MAC Framework sysctl namespace.
|
|
*/
|
|
SYSCTL_DECL(_security);
|
|
SYSCTL_DECL(_security_mac);
|
|
#ifdef MAC_DEBUG
|
|
SYSCTL_DECL(_security_mac_debug);
|
|
SYSCTL_DECL(_security_mac_debug_counters);
|
|
#endif
|
|
|
|
/*
|
|
* MAC Framework global types and typedefs.
|
|
*/
|
|
LIST_HEAD(mac_policy_list_head, mac_policy_conf);
|
|
MALLOC_DECLARE(M_MACTEMP);
|
|
|
|
/*
|
|
* MAC Framework global variables.
|
|
*/
|
|
extern struct mac_policy_list_head mac_policy_list;
|
|
extern struct mac_policy_list_head mac_static_policy_list;
|
|
extern int mac_late;
|
|
extern int mac_enforce_process;
|
|
extern int mac_enforce_vm;
|
|
#ifndef MAC_ALWAYS_LABEL_MBUF
|
|
extern int mac_labelmbufs;
|
|
#endif
|
|
|
|
/*
|
|
* MAC Framework object/access counter primitives, conditionally
|
|
* compiled.
|
|
*/
|
|
#ifdef MAC_DEBUG
|
|
#define MAC_DEBUG_COUNTER_INC(x) atomic_add_int(x, 1);
|
|
#define MAC_DEBUG_COUNTER_DEC(x) atomic_subtract_int(x, 1);
|
|
#else
|
|
#define MAC_DEBUG_COUNTER_INC(x)
|
|
#define MAC_DEBUG_COUNTER_DEC(x)
|
|
#endif
|
|
|
|
/*
|
|
* MAC Framework infrastructure functions.
|
|
*/
|
|
int mac_error_select(int error1, int error2);
|
|
|
|
void mac_policy_grab_exclusive(void);
|
|
void mac_policy_assert_exclusive(void);
|
|
void mac_policy_release_exclusive(void);
|
|
void mac_policy_list_busy(void);
|
|
int mac_policy_list_conditional_busy(void);
|
|
void mac_policy_list_unbusy(void);
|
|
|
|
void mac_init_label(struct label *label);
|
|
void mac_destroy_label(struct label *label);
|
|
int mac_check_structmac_consistent(struct mac *mac);
|
|
int mac_allocate_slot(void);
|
|
|
|
/*
|
|
* MAC Framework per-object type functions. It's not yet clear how
|
|
* the namespaces, etc, should work for these, so for now, sort by
|
|
* object type.
|
|
*/
|
|
int mac_check_cred_relabel(struct ucred *cred, struct label *newlabel);
|
|
void mac_destroy_cred_label(struct label *label);
|
|
int mac_externalize_cred_label(struct label *label, char *elements,
|
|
char *outbuf, size_t outbuflen, int flags);
|
|
void mac_init_cred_label(struct label *label);
|
|
int mac_internalize_cred_label(struct label *label, char *string);
|
|
void mac_relabel_cred(struct ucred *cred, struct label *newlabel);
|
|
|
|
void mac_copy_pipe_label(struct label *src, struct label *dest);
|
|
void mac_destroy_pipe_label(struct label *label);
|
|
int mac_externalize_pipe_label(struct label *label, char *elements,
|
|
char *outbuf, size_t outbuflen, int flags);
|
|
void mac_init_pipe_label(struct label *label);
|
|
int mac_internalize_pipe_label(struct label *label, char *string);
|
|
|
|
int mac_externalize_vnode_label(struct label *label, char *elements,
|
|
char *outbuf, size_t outbuflen, int flags);
|
|
int mac_internalize_vnode_label(struct label *label, char *string);
|
|
void mac_check_vnode_mmap_downgrade(struct ucred *cred, struct vnode *vp,
|
|
int *prot);
|
|
int vn_setlabel(struct vnode *vp, struct label *intlabel,
|
|
struct ucred *cred);
|
|
|
|
/*
|
|
* MAC_CHECK performs the designated check by walking the policy module
|
|
* list and checking with each as to how it feels about the request.
|
|
* Note that it returns its value via 'error' in the scope of the caller.
|
|
*/
|
|
#define MAC_CHECK(check, args...) do { \
|
|
struct mac_policy_conf *mpc; \
|
|
int entrycount; \
|
|
\
|
|
error = 0; \
|
|
LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) { \
|
|
if (mpc->mpc_ops->mpo_ ## check != NULL) \
|
|
error = mac_error_select( \
|
|
mpc->mpc_ops->mpo_ ## check (args), \
|
|
error); \
|
|
} \
|
|
if ((entrycount = mac_policy_list_conditional_busy()) != 0) { \
|
|
LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \
|
|
if (mpc->mpc_ops->mpo_ ## check != NULL) \
|
|
error = mac_error_select( \
|
|
mpc->mpc_ops->mpo_ ## check (args), \
|
|
error); \
|
|
} \
|
|
mac_policy_list_unbusy(); \
|
|
} \
|
|
} while (0)
|
|
|
|
/*
|
|
* MAC_BOOLEAN performs the designated boolean composition by walking
|
|
* the module list, invoking each instance of the operation, and
|
|
* combining the results using the passed C operator. Note that it
|
|
* returns its value via 'result' in the scope of the caller, which
|
|
* should be initialized by the caller in a meaningful way to get
|
|
* a meaningful result.
|
|
*/
|
|
#define MAC_BOOLEAN(operation, composition, args...) do { \
|
|
struct mac_policy_conf *mpc; \
|
|
int entrycount; \
|
|
\
|
|
LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) { \
|
|
if (mpc->mpc_ops->mpo_ ## operation != NULL) \
|
|
result = result composition \
|
|
mpc->mpc_ops->mpo_ ## operation (args); \
|
|
} \
|
|
if ((entrycount = mac_policy_list_conditional_busy()) != 0) { \
|
|
LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \
|
|
if (mpc->mpc_ops->mpo_ ## operation != NULL) \
|
|
result = result composition \
|
|
mpc->mpc_ops->mpo_ ## operation \
|
|
(args); \
|
|
} \
|
|
mac_policy_list_unbusy(); \
|
|
} \
|
|
} while (0)
|
|
|
|
#define MAC_EXTERNALIZE(type, label, elementlist, outbuf, \
|
|
outbuflen) do { \
|
|
int claimed, first, ignorenotfound, savedlen; \
|
|
char *element_name, *element_temp; \
|
|
struct sbuf sb; \
|
|
\
|
|
error = 0; \
|
|
first = 1; \
|
|
sbuf_new(&sb, outbuf, outbuflen, SBUF_FIXEDLEN); \
|
|
element_temp = elementlist; \
|
|
while ((element_name = strsep(&element_temp, ",")) != NULL) { \
|
|
if (element_name[0] == '?') { \
|
|
element_name++; \
|
|
ignorenotfound = 1; \
|
|
} else \
|
|
ignorenotfound = 0; \
|
|
savedlen = sbuf_len(&sb); \
|
|
if (first) \
|
|
error = sbuf_printf(&sb, "%s/", element_name); \
|
|
else \
|
|
error = sbuf_printf(&sb, ",%s/", element_name); \
|
|
if (error == -1) { \
|
|
error = EINVAL; /* XXX: E2BIG? */ \
|
|
break; \
|
|
} \
|
|
claimed = 0; \
|
|
MAC_CHECK(externalize_ ## type ## _label, label, \
|
|
element_name, &sb, &claimed); \
|
|
if (error) \
|
|
break; \
|
|
if (claimed == 0 && ignorenotfound) { \
|
|
/* Revert last label name. */ \
|
|
sbuf_setpos(&sb, savedlen); \
|
|
} else if (claimed != 1) { \
|
|
error = EINVAL; /* XXX: ENOLABEL? */ \
|
|
break; \
|
|
} else { \
|
|
first = 0; \
|
|
} \
|
|
} \
|
|
sbuf_finish(&sb); \
|
|
} while (0)
|
|
|
|
#define MAC_INTERNALIZE(type, label, instring) do { \
|
|
char *element, *element_name, *element_data; \
|
|
int claimed; \
|
|
\
|
|
error = 0; \
|
|
element = instring; \
|
|
while ((element_name = strsep(&element, ",")) != NULL) { \
|
|
element_data = element_name; \
|
|
element_name = strsep(&element_data, "/"); \
|
|
if (element_data == NULL) { \
|
|
error = EINVAL; \
|
|
break; \
|
|
} \
|
|
claimed = 0; \
|
|
MAC_CHECK(internalize_ ## type ## _label, label, \
|
|
element_name, element_data, &claimed); \
|
|
if (error) \
|
|
break; \
|
|
if (claimed != 1) { \
|
|
/* XXXMAC: Another error here? */ \
|
|
error = EINVAL; \
|
|
break; \
|
|
} \
|
|
} \
|
|
} while (0)
|
|
|
|
/*
|
|
* MAC_PERFORM performs the designated operation by walking the policy
|
|
* module list and invoking that operation for each policy.
|
|
*/
|
|
#define MAC_PERFORM(operation, args...) do { \
|
|
struct mac_policy_conf *mpc; \
|
|
int entrycount; \
|
|
\
|
|
LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) { \
|
|
if (mpc->mpc_ops->mpo_ ## operation != NULL) \
|
|
mpc->mpc_ops->mpo_ ## operation (args); \
|
|
} \
|
|
if ((entrycount = mac_policy_list_conditional_busy()) != 0) { \
|
|
LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \
|
|
if (mpc->mpc_ops->mpo_ ## operation != NULL) \
|
|
mpc->mpc_ops->mpo_ ## operation (args); \
|
|
} \
|
|
mac_policy_list_unbusy(); \
|
|
} \
|
|
} while (0)
|