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Copy mac_bsdextended.c to two object-specific files as a prototype for how
modularize MAC policy layout. Obtained from: TrustedBSD Project
This commit is contained in:
Robert Watson
parent
c8978106d0
commit
4074f67f5b
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=184330
768
sys/security/mac_bsdextended/ugidfw_system.c
Normal file
768
sys/security/mac_bsdextended/ugidfw_system.c
Normal file
@ -0,0 +1,768 @@
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/*-
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* Copyright (c) 1999-2002, 2007 Robert N. M. Watson
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* Copyright (c) 2001-2005 Networks Associates Technology, Inc.
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* Copyright (c) 2005 Tom Rhodes
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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 for the TrustedBSD Project.
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* It was later enhanced by Tom Rhodes for the 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 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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/*
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* Developed by the TrustedBSD Project.
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*
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* "BSD Extended" MAC policy, allowing the administrator to impose mandatory
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* firewall-like rules regarding users and file system objects.
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*/
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#include <sys/param.h>
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#include <sys/acl.h>
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#include <sys/kernel.h>
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#include <sys/jail.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/mount.h>
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#include <sys/mutex.h>
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#include <sys/priv.h>
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#include <sys/systm.h>
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#include <sys/vnode.h>
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#include <sys/sysctl.h>
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#include <sys/syslog.h>
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#include <sys/stat.h>
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#include <security/mac/mac_policy.h>
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#include <security/mac_bsdextended/mac_bsdextended.h>
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static struct mtx ugidfw_mtx;
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SYSCTL_DECL(_security_mac);
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SYSCTL_NODE(_security_mac, OID_AUTO, bsdextended, CTLFLAG_RW, 0,
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"TrustedBSD extended BSD MAC policy controls");
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static int ugidfw_enabled = 1;
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SYSCTL_INT(_security_mac_bsdextended, OID_AUTO, enabled, CTLFLAG_RW,
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&ugidfw_enabled, 0, "Enforce extended BSD policy");
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TUNABLE_INT("security.mac.bsdextended.enabled", &ugidfw_enabled);
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MALLOC_DEFINE(M_MACBSDEXTENDED, "mac_bsdextended", "BSD Extended MAC rule");
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#define MAC_BSDEXTENDED_MAXRULES 250
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static struct mac_bsdextended_rule *rules[MAC_BSDEXTENDED_MAXRULES];
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static int rule_count = 0;
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static int rule_slots = 0;
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static int rule_version = MB_VERSION;
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SYSCTL_INT(_security_mac_bsdextended, OID_AUTO, rule_count, CTLFLAG_RD,
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&rule_count, 0, "Number of defined rules\n");
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SYSCTL_INT(_security_mac_bsdextended, OID_AUTO, rule_slots, CTLFLAG_RD,
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&rule_slots, 0, "Number of used rule slots\n");
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SYSCTL_INT(_security_mac_bsdextended, OID_AUTO, rule_version, CTLFLAG_RD,
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&rule_version, 0, "Version number for API\n");
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/*
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* This is just used for logging purposes, eventually we would like to log
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* much more then failed requests.
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*/
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static int ugidfw_logging;
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SYSCTL_INT(_security_mac_bsdextended, OID_AUTO, logging, CTLFLAG_RW,
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&ugidfw_logging, 0, "Log failed authorization requests");
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/*
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* This tunable is here for compatibility. It will allow the user to switch
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* between the new mode (first rule matches) and the old functionality (all
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* rules match).
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*/
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static int ugidfw_firstmatch_enabled;
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SYSCTL_INT(_security_mac_bsdextended, OID_AUTO, firstmatch_enabled,
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CTLFLAG_RW, &ugidfw_firstmatch_enabled, 1,
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"Disable/enable match first rule functionality");
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static int
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ugidfw_rule_valid(struct mac_bsdextended_rule *rule)
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{
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if ((rule->mbr_subject.mbs_flags | MBS_ALL_FLAGS) != MBS_ALL_FLAGS)
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return (EINVAL);
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if ((rule->mbr_subject.mbs_neg | MBS_ALL_FLAGS) != MBS_ALL_FLAGS)
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return (EINVAL);
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if ((rule->mbr_object.mbo_flags | MBO_ALL_FLAGS) != MBO_ALL_FLAGS)
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return (EINVAL);
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if ((rule->mbr_object.mbo_neg | MBO_ALL_FLAGS) != MBO_ALL_FLAGS)
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return (EINVAL);
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if ((rule->mbr_object.mbo_neg | MBO_TYPE_DEFINED) &&
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(rule->mbr_object.mbo_type | MBO_ALL_TYPE) != MBO_ALL_TYPE)
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return (EINVAL);
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if ((rule->mbr_mode | MBI_ALLPERM) != MBI_ALLPERM)
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return (EINVAL);
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return (0);
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}
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static int
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sysctl_rule(SYSCTL_HANDLER_ARGS)
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{
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struct mac_bsdextended_rule temprule, *ruleptr;
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u_int namelen;
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int error, index, *name;
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error = 0;
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name = (int *)arg1;
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namelen = arg2;
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if (namelen != 1)
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return (EINVAL);
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index = name[0];
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if (index >= MAC_BSDEXTENDED_MAXRULES)
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return (ENOENT);
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ruleptr = NULL;
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if (req->newptr && req->newlen != 0) {
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error = SYSCTL_IN(req, &temprule, sizeof(temprule));
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if (error)
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return (error);
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ruleptr = malloc(sizeof(*ruleptr), M_MACBSDEXTENDED,
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M_WAITOK | M_ZERO);
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}
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mtx_lock(&ugidfw_mtx);
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if (req->oldptr) {
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if (index < 0 || index > rule_slots + 1) {
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error = ENOENT;
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goto out;
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}
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if (rules[index] == NULL) {
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error = ENOENT;
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goto out;
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}
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temprule = *rules[index];
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}
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if (req->newptr && req->newlen == 0) {
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KASSERT(ruleptr == NULL, ("sysctl_rule: ruleptr != NULL"));
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ruleptr = rules[index];
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if (ruleptr == NULL) {
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error = ENOENT;
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goto out;
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}
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rule_count--;
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rules[index] = NULL;
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} else if (req->newptr) {
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error = ugidfw_rule_valid(&temprule);
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if (error)
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goto out;
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if (rules[index] == NULL) {
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*ruleptr = temprule;
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rules[index] = ruleptr;
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ruleptr = NULL;
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if (index + 1 > rule_slots)
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rule_slots = index + 1;
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rule_count++;
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} else
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*rules[index] = temprule;
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}
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out:
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mtx_unlock(&ugidfw_mtx);
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if (ruleptr != NULL)
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free(ruleptr, M_MACBSDEXTENDED);
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if (req->oldptr && error == 0)
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error = SYSCTL_OUT(req, &temprule, sizeof(temprule));
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return (error);
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}
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SYSCTL_NODE(_security_mac_bsdextended, OID_AUTO, rules, CTLFLAG_RW,
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sysctl_rule, "BSD extended MAC rules");
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static void
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ugidfw_init(struct mac_policy_conf *mpc)
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{
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mtx_init(&ugidfw_mtx, "mac_bsdextended lock", NULL, MTX_DEF);
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}
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static void
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ugidfw_destroy(struct mac_policy_conf *mpc)
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{
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mtx_destroy(&ugidfw_mtx);
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}
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static int
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ugidfw_rulecheck(struct mac_bsdextended_rule *rule,
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struct ucred *cred, struct vnode *vp, struct vattr *vap, int acc_mode)
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{
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int mac_granted, match, priv_granted;
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int i;
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/*
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* Is there a subject match?
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*/
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mtx_assert(&ugidfw_mtx, MA_OWNED);
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if (rule->mbr_subject.mbs_flags & MBS_UID_DEFINED) {
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match = ((cred->cr_uid <= rule->mbr_subject.mbs_uid_max &&
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cred->cr_uid >= rule->mbr_subject.mbs_uid_min) ||
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(cred->cr_ruid <= rule->mbr_subject.mbs_uid_max &&
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cred->cr_ruid >= rule->mbr_subject.mbs_uid_min) ||
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(cred->cr_svuid <= rule->mbr_subject.mbs_uid_max &&
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cred->cr_svuid >= rule->mbr_subject.mbs_uid_min));
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if (rule->mbr_subject.mbs_neg & MBS_UID_DEFINED)
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match = !match;
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if (!match)
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return (0);
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}
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if (rule->mbr_subject.mbs_flags & MBS_GID_DEFINED) {
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match = ((cred->cr_rgid <= rule->mbr_subject.mbs_gid_max &&
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cred->cr_rgid >= rule->mbr_subject.mbs_gid_min) ||
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(cred->cr_svgid <= rule->mbr_subject.mbs_gid_max &&
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cred->cr_svgid >= rule->mbr_subject.mbs_gid_min));
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if (!match) {
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for (i = 0; i < cred->cr_ngroups; i++) {
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if (cred->cr_groups[i]
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<= rule->mbr_subject.mbs_gid_max &&
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cred->cr_groups[i]
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>= rule->mbr_subject.mbs_gid_min) {
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match = 1;
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break;
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}
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}
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}
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if (rule->mbr_subject.mbs_neg & MBS_GID_DEFINED)
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match = !match;
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if (!match)
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return (0);
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}
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if (rule->mbr_subject.mbs_flags & MBS_PRISON_DEFINED) {
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match = (cred->cr_prison != NULL &&
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cred->cr_prison->pr_id == rule->mbr_subject.mbs_prison);
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if (rule->mbr_subject.mbs_neg & MBS_PRISON_DEFINED)
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match = !match;
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if (!match)
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return (0);
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}
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/*
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* Is there an object match?
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*/
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if (rule->mbr_object.mbo_flags & MBO_UID_DEFINED) {
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match = (vap->va_uid <= rule->mbr_object.mbo_uid_max &&
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vap->va_uid >= rule->mbr_object.mbo_uid_min);
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if (rule->mbr_object.mbo_neg & MBO_UID_DEFINED)
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match = !match;
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if (!match)
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return (0);
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}
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if (rule->mbr_object.mbo_flags & MBO_GID_DEFINED) {
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match = (vap->va_gid <= rule->mbr_object.mbo_gid_max &&
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vap->va_gid >= rule->mbr_object.mbo_gid_min);
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if (rule->mbr_object.mbo_neg & MBO_GID_DEFINED)
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match = !match;
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if (!match)
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return (0);
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}
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if (rule->mbr_object.mbo_flags & MBO_FSID_DEFINED) {
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match = (bcmp(&(vp->v_mount->mnt_stat.f_fsid),
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&(rule->mbr_object.mbo_fsid),
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sizeof(rule->mbr_object.mbo_fsid)) == 0);
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if (rule->mbr_object.mbo_neg & MBO_FSID_DEFINED)
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match = !match;
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if (!match)
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return (0);
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}
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if (rule->mbr_object.mbo_flags & MBO_SUID) {
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match = (vap->va_mode & S_ISUID);
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if (rule->mbr_object.mbo_neg & MBO_SUID)
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match = !match;
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if (!match)
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return (0);
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}
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if (rule->mbr_object.mbo_flags & MBO_SGID) {
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match = (vap->va_mode & S_ISGID);
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if (rule->mbr_object.mbo_neg & MBO_SGID)
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match = !match;
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if (!match)
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return (0);
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}
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if (rule->mbr_object.mbo_flags & MBO_UID_SUBJECT) {
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match = (vap->va_uid == cred->cr_uid ||
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vap->va_uid == cred->cr_ruid ||
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vap->va_uid == cred->cr_svuid);
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if (rule->mbr_object.mbo_neg & MBO_UID_SUBJECT)
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match = !match;
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if (!match)
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return (0);
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}
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if (rule->mbr_object.mbo_flags & MBO_GID_SUBJECT) {
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match = (groupmember(vap->va_gid, cred) ||
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vap->va_gid == cred->cr_rgid ||
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vap->va_gid == cred->cr_svgid);
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if (rule->mbr_object.mbo_neg & MBO_GID_SUBJECT)
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match = !match;
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if (!match)
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return (0);
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}
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if (rule->mbr_object.mbo_flags & MBO_TYPE_DEFINED) {
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switch (vap->va_type) {
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case VREG:
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match = (rule->mbr_object.mbo_type & MBO_TYPE_REG);
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break;
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case VDIR:
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match = (rule->mbr_object.mbo_type & MBO_TYPE_DIR);
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break;
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case VBLK:
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match = (rule->mbr_object.mbo_type & MBO_TYPE_BLK);
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break;
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case VCHR:
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match = (rule->mbr_object.mbo_type & MBO_TYPE_CHR);
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break;
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case VLNK:
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match = (rule->mbr_object.mbo_type & MBO_TYPE_LNK);
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break;
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case VSOCK:
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match = (rule->mbr_object.mbo_type & MBO_TYPE_SOCK);
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break;
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case VFIFO:
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match = (rule->mbr_object.mbo_type & MBO_TYPE_FIFO);
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break;
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default:
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match = 0;
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}
|
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if (rule->mbr_object.mbo_neg & MBO_TYPE_DEFINED)
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match = !match;
|
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if (!match)
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return (0);
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}
|
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/*
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* MBI_APPEND should not be here as it should get converted to
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* MBI_WRITE.
|
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*/
|
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priv_granted = 0;
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mac_granted = rule->mbr_mode;
|
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if ((acc_mode & MBI_ADMIN) && (mac_granted & MBI_ADMIN) == 0 &&
|
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priv_check_cred(cred, PRIV_VFS_ADMIN, 0) == 0)
|
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priv_granted |= MBI_ADMIN;
|
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if ((acc_mode & MBI_EXEC) && (mac_granted & MBI_EXEC) == 0 &&
|
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priv_check_cred(cred, (vap->va_type == VDIR) ? PRIV_VFS_LOOKUP :
|
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PRIV_VFS_EXEC, 0) == 0)
|
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priv_granted |= MBI_EXEC;
|
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if ((acc_mode & MBI_READ) && (mac_granted & MBI_READ) == 0 &&
|
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priv_check_cred(cred, PRIV_VFS_READ, 0) == 0)
|
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priv_granted |= MBI_READ;
|
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if ((acc_mode & MBI_STAT) && (mac_granted & MBI_STAT) == 0 &&
|
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priv_check_cred(cred, PRIV_VFS_STAT, 0) == 0)
|
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priv_granted |= MBI_STAT;
|
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if ((acc_mode & MBI_WRITE) && (mac_granted & MBI_WRITE) == 0 &&
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priv_check_cred(cred, PRIV_VFS_WRITE, 0) == 0)
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priv_granted |= MBI_WRITE;
|
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/*
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* Is the access permitted?
|
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*/
|
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if (((mac_granted | priv_granted) & acc_mode) != acc_mode) {
|
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if (ugidfw_logging)
|
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log(LOG_AUTHPRIV, "mac_bsdextended: %d:%d request %d"
|
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" on %d:%d failed. \n", cred->cr_ruid,
|
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cred->cr_rgid, acc_mode, vap->va_uid,
|
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vap->va_gid);
|
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return (EACCES);
|
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}
|
||||
|
||||
/*
|
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* If the rule matched, permits access, and first match is enabled,
|
||||
* return success.
|
||||
*/
|
||||
if (ugidfw_firstmatch_enabled)
|
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return (EJUSTRETURN);
|
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else
|
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return (0);
|
||||
}
|
||||
|
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static int
|
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ugidfw_check(struct ucred *cred, struct vnode *vp, struct vattr *vap,
|
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int acc_mode)
|
||||
{
|
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int error, i;
|
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|
||||
/*
|
||||
* Since we do not separately handle append, map append to write.
|
||||
*/
|
||||
if (acc_mode & MBI_APPEND) {
|
||||
acc_mode &= ~MBI_APPEND;
|
||||
acc_mode |= MBI_WRITE;
|
||||
}
|
||||
mtx_lock(&ugidfw_mtx);
|
||||
for (i = 0; i < rule_slots; i++) {
|
||||
if (rules[i] == NULL)
|
||||
continue;
|
||||
error = ugidfw_rulecheck(rules[i], cred,
|
||||
vp, vap, acc_mode);
|
||||
if (error == EJUSTRETURN)
|
||||
break;
|
||||
if (error) {
|
||||
mtx_unlock(&ugidfw_mtx);
|
||||
return (error);
|
||||
}
|
||||
}
|
||||
mtx_unlock(&ugidfw_mtx);
|
||||
return (0);
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_check_vp(struct ucred *cred, struct vnode *vp, int acc_mode)
|
||||
{
|
||||
int error;
|
||||
struct vattr vap;
|
||||
|
||||
if (!ugidfw_enabled)
|
||||
return (0);
|
||||
error = VOP_GETATTR(vp, &vap, cred);
|
||||
if (error)
|
||||
return (error);
|
||||
return (ugidfw_check(cred, vp, &vap, acc_mode));
|
||||
}
|
||||
|
||||
/*
|
||||
* Object-specific entry point implementations are sorted alphabetically by
|
||||
* object type and then by operation.
|
||||
*/
|
||||
static int
|
||||
ugidfw_system_check_acct(struct ucred *cred, struct vnode *vp,
|
||||
struct label *vplabel)
|
||||
{
|
||||
|
||||
if (vp != NULL)
|
||||
return (ugidfw_check_vp(cred, vp, MBI_WRITE));
|
||||
else
|
||||
return (0);
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_system_check_auditctl(struct ucred *cred, struct vnode *vp,
|
||||
struct label *vplabel)
|
||||
{
|
||||
|
||||
if (vp != NULL)
|
||||
return (ugidfw_check_vp(cred, vp, MBI_WRITE));
|
||||
else
|
||||
return (0);
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_system_check_swapon(struct ucred *cred, struct vnode *vp,
|
||||
struct label *vplabel)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, vp, MBI_WRITE));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_access(struct ucred *cred, struct vnode *vp,
|
||||
struct label *vplabel, int acc_mode)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, vp, acc_mode));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_chdir(struct ucred *cred, struct vnode *dvp,
|
||||
struct label *dvplabel)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, dvp, MBI_EXEC));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_chroot(struct ucred *cred, struct vnode *dvp,
|
||||
struct label *dvplabel)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, dvp, MBI_EXEC));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_check_create_vnode(struct ucred *cred, struct vnode *dvp,
|
||||
struct label *dvplabel, struct componentname *cnp, struct vattr *vap)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, dvp, MBI_WRITE));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_deleteacl(struct ucred *cred, struct vnode *vp,
|
||||
struct label *vplabel, acl_type_t type)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, vp, MBI_ADMIN));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_deleteextattr(struct ucred *cred, struct vnode *vp,
|
||||
struct label *vplabel, int attrnamespace, const char *name)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, vp, MBI_WRITE));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_exec(struct ucred *cred, struct vnode *vp,
|
||||
struct label *vplabel, struct image_params *imgp,
|
||||
struct label *execlabel)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, vp, MBI_READ|MBI_EXEC));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_getacl(struct ucred *cred, struct vnode *vp,
|
||||
struct label *vplabel, acl_type_t type)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, vp, MBI_STAT));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_getextattr(struct ucred *cred, struct vnode *vp,
|
||||
struct label *vplabel, int attrnamespace, const char *name,
|
||||
struct uio *uio)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, vp, MBI_READ));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_link(struct ucred *cred, struct vnode *dvp,
|
||||
struct label *dvplabel, struct vnode *vp, struct label *label,
|
||||
struct componentname *cnp)
|
||||
{
|
||||
int error;
|
||||
|
||||
error = ugidfw_check_vp(cred, dvp, MBI_WRITE);
|
||||
if (error)
|
||||
return (error);
|
||||
error = ugidfw_check_vp(cred, vp, MBI_WRITE);
|
||||
if (error)
|
||||
return (error);
|
||||
return (0);
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_listextattr(struct ucred *cred, struct vnode *vp,
|
||||
struct label *vplabel, int attrnamespace)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, vp, MBI_READ));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_lookup(struct ucred *cred, struct vnode *dvp,
|
||||
struct label *dvplabel, struct componentname *cnp)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, dvp, MBI_EXEC));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_open(struct ucred *cred, struct vnode *vp,
|
||||
struct label *vplabel, int acc_mode)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, vp, acc_mode));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_readdir(struct ucred *cred, struct vnode *dvp,
|
||||
struct label *dvplabel)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, dvp, MBI_READ));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_readdlink(struct ucred *cred, struct vnode *vp,
|
||||
struct label *vplabel)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, vp, MBI_READ));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_rename_from(struct ucred *cred, struct vnode *dvp,
|
||||
struct label *dvplabel, struct vnode *vp, struct label *vplabel,
|
||||
struct componentname *cnp)
|
||||
{
|
||||
int error;
|
||||
|
||||
error = ugidfw_check_vp(cred, dvp, MBI_WRITE);
|
||||
if (error)
|
||||
return (error);
|
||||
return (ugidfw_check_vp(cred, vp, MBI_WRITE));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_rename_to(struct ucred *cred, struct vnode *dvp,
|
||||
struct label *dvplabel, struct vnode *vp, struct label *vplabel,
|
||||
int samedir, struct componentname *cnp)
|
||||
{
|
||||
int error;
|
||||
|
||||
error = ugidfw_check_vp(cred, dvp, MBI_WRITE);
|
||||
if (error)
|
||||
return (error);
|
||||
if (vp != NULL)
|
||||
error = ugidfw_check_vp(cred, vp, MBI_WRITE);
|
||||
return (error);
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_revoke(struct ucred *cred, struct vnode *vp,
|
||||
struct label *vplabel)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, vp, MBI_ADMIN));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_check_setacl_vnode(struct ucred *cred, struct vnode *vp,
|
||||
struct label *vplabel, acl_type_t type, struct acl *acl)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, vp, MBI_ADMIN));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_setextattr(struct ucred *cred, struct vnode *vp,
|
||||
struct label *vplabel, int attrnamespace, const char *name,
|
||||
struct uio *uio)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, vp, MBI_WRITE));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_setflags(struct ucred *cred, struct vnode *vp,
|
||||
struct label *vplabel, u_long flags)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, vp, MBI_ADMIN));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_setmode(struct ucred *cred, struct vnode *vp,
|
||||
struct label *vplabel, mode_t mode)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, vp, MBI_ADMIN));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_setowner(struct ucred *cred, struct vnode *vp,
|
||||
struct label *vplabel, uid_t uid, gid_t gid)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, vp, MBI_ADMIN));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_setutimes(struct ucred *cred, struct vnode *vp,
|
||||
struct label *vplabel, struct timespec atime, struct timespec utime)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, vp, MBI_ADMIN));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_stat(struct ucred *active_cred,
|
||||
struct ucred *file_cred, struct vnode *vp, struct label *vplabel)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(active_cred, vp, MBI_STAT));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_unlink(struct ucred *cred, struct vnode *dvp,
|
||||
struct label *dvplabel, struct vnode *vp, struct label *vplabel,
|
||||
struct componentname *cnp)
|
||||
{
|
||||
int error;
|
||||
|
||||
error = ugidfw_check_vp(cred, dvp, MBI_WRITE);
|
||||
if (error)
|
||||
return (error);
|
||||
return (ugidfw_check_vp(cred, vp, MBI_WRITE));
|
||||
}
|
||||
|
||||
static struct mac_policy_ops ugidfw_ops =
|
||||
{
|
||||
.mpo_destroy = ugidfw_destroy,
|
||||
.mpo_init = ugidfw_init,
|
||||
.mpo_system_check_acct = ugidfw_system_check_acct,
|
||||
.mpo_system_check_auditctl = ugidfw_system_check_auditctl,
|
||||
.mpo_system_check_swapon = ugidfw_system_check_swapon,
|
||||
.mpo_vnode_check_access = ugidfw_vnode_check_access,
|
||||
.mpo_vnode_check_chdir = ugidfw_vnode_check_chdir,
|
||||
.mpo_vnode_check_chroot = ugidfw_vnode_check_chroot,
|
||||
.mpo_vnode_check_create = ugidfw_check_create_vnode,
|
||||
.mpo_vnode_check_deleteacl = ugidfw_vnode_check_deleteacl,
|
||||
.mpo_vnode_check_deleteextattr = ugidfw_vnode_check_deleteextattr,
|
||||
.mpo_vnode_check_exec = ugidfw_vnode_check_exec,
|
||||
.mpo_vnode_check_getacl = ugidfw_vnode_check_getacl,
|
||||
.mpo_vnode_check_getextattr = ugidfw_vnode_check_getextattr,
|
||||
.mpo_vnode_check_link = ugidfw_vnode_check_link,
|
||||
.mpo_vnode_check_listextattr = ugidfw_vnode_check_listextattr,
|
||||
.mpo_vnode_check_lookup = ugidfw_vnode_check_lookup,
|
||||
.mpo_vnode_check_open = ugidfw_vnode_check_open,
|
||||
.mpo_vnode_check_readdir = ugidfw_vnode_check_readdir,
|
||||
.mpo_vnode_check_readlink = ugidfw_vnode_check_readdlink,
|
||||
.mpo_vnode_check_rename_from = ugidfw_vnode_check_rename_from,
|
||||
.mpo_vnode_check_rename_to = ugidfw_vnode_check_rename_to,
|
||||
.mpo_vnode_check_revoke = ugidfw_vnode_check_revoke,
|
||||
.mpo_vnode_check_setacl = ugidfw_check_setacl_vnode,
|
||||
.mpo_vnode_check_setextattr = ugidfw_vnode_check_setextattr,
|
||||
.mpo_vnode_check_setflags = ugidfw_vnode_check_setflags,
|
||||
.mpo_vnode_check_setmode = ugidfw_vnode_check_setmode,
|
||||
.mpo_vnode_check_setowner = ugidfw_vnode_check_setowner,
|
||||
.mpo_vnode_check_setutimes = ugidfw_vnode_check_setutimes,
|
||||
.mpo_vnode_check_stat = ugidfw_vnode_check_stat,
|
||||
.mpo_vnode_check_unlink = ugidfw_vnode_check_unlink,
|
||||
};
|
||||
|
||||
MAC_POLICY_SET(&ugidfw_ops, mac_bsdextended, "TrustedBSD MAC/BSD Extended",
|
||||
MPC_LOADTIME_FLAG_UNLOADOK, NULL, 0);
|
||||
768
sys/security/mac_bsdextended/ugidfw_vnode.c
Normal file
768
sys/security/mac_bsdextended/ugidfw_vnode.c
Normal file
@ -0,0 +1,768 @@
|
||||
/*-
|
||||
* Copyright (c) 1999-2002, 2007 Robert N. M. Watson
|
||||
* Copyright (c) 2001-2005 Networks Associates Technology, Inc.
|
||||
* Copyright (c) 2005 Tom Rhodes
|
||||
* Copyright (c) 2006 SPARTA, Inc.
|
||||
* All rights reserved.
|
||||
*
|
||||
* This software was developed by Robert Watson for the TrustedBSD Project.
|
||||
* It was later enhanced by Tom Rhodes 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.
|
||||
*
|
||||
* This software was enhanced by SPARTA ISSO under SPAWAR contract
|
||||
* N66001-04-C-6019 ("SEFOS").
|
||||
*
|
||||
* 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.
|
||||
*
|
||||
* $FreeBSD$
|
||||
*/
|
||||
|
||||
/*
|
||||
* Developed by the TrustedBSD Project.
|
||||
*
|
||||
* "BSD Extended" MAC policy, allowing the administrator to impose mandatory
|
||||
* firewall-like rules regarding users and file system objects.
|
||||
*/
|
||||
|
||||
#include <sys/param.h>
|
||||
#include <sys/acl.h>
|
||||
#include <sys/kernel.h>
|
||||
#include <sys/jail.h>
|
||||
#include <sys/lock.h>
|
||||
#include <sys/malloc.h>
|
||||
#include <sys/module.h>
|
||||
#include <sys/mount.h>
|
||||
#include <sys/mutex.h>
|
||||
#include <sys/priv.h>
|
||||
#include <sys/systm.h>
|
||||
#include <sys/vnode.h>
|
||||
#include <sys/sysctl.h>
|
||||
#include <sys/syslog.h>
|
||||
#include <sys/stat.h>
|
||||
|
||||
#include <security/mac/mac_policy.h>
|
||||
#include <security/mac_bsdextended/mac_bsdextended.h>
|
||||
|
||||
static struct mtx ugidfw_mtx;
|
||||
|
||||
SYSCTL_DECL(_security_mac);
|
||||
|
||||
SYSCTL_NODE(_security_mac, OID_AUTO, bsdextended, CTLFLAG_RW, 0,
|
||||
"TrustedBSD extended BSD MAC policy controls");
|
||||
|
||||
static int ugidfw_enabled = 1;
|
||||
SYSCTL_INT(_security_mac_bsdextended, OID_AUTO, enabled, CTLFLAG_RW,
|
||||
&ugidfw_enabled, 0, "Enforce extended BSD policy");
|
||||
TUNABLE_INT("security.mac.bsdextended.enabled", &ugidfw_enabled);
|
||||
|
||||
MALLOC_DEFINE(M_MACBSDEXTENDED, "mac_bsdextended", "BSD Extended MAC rule");
|
||||
|
||||
#define MAC_BSDEXTENDED_MAXRULES 250
|
||||
static struct mac_bsdextended_rule *rules[MAC_BSDEXTENDED_MAXRULES];
|
||||
static int rule_count = 0;
|
||||
static int rule_slots = 0;
|
||||
static int rule_version = MB_VERSION;
|
||||
|
||||
SYSCTL_INT(_security_mac_bsdextended, OID_AUTO, rule_count, CTLFLAG_RD,
|
||||
&rule_count, 0, "Number of defined rules\n");
|
||||
SYSCTL_INT(_security_mac_bsdextended, OID_AUTO, rule_slots, CTLFLAG_RD,
|
||||
&rule_slots, 0, "Number of used rule slots\n");
|
||||
SYSCTL_INT(_security_mac_bsdextended, OID_AUTO, rule_version, CTLFLAG_RD,
|
||||
&rule_version, 0, "Version number for API\n");
|
||||
|
||||
/*
|
||||
* This is just used for logging purposes, eventually we would like to log
|
||||
* much more then failed requests.
|
||||
*/
|
||||
static int ugidfw_logging;
|
||||
SYSCTL_INT(_security_mac_bsdextended, OID_AUTO, logging, CTLFLAG_RW,
|
||||
&ugidfw_logging, 0, "Log failed authorization requests");
|
||||
|
||||
/*
|
||||
* This tunable is here for compatibility. It will allow the user to switch
|
||||
* between the new mode (first rule matches) and the old functionality (all
|
||||
* rules match).
|
||||
*/
|
||||
static int ugidfw_firstmatch_enabled;
|
||||
SYSCTL_INT(_security_mac_bsdextended, OID_AUTO, firstmatch_enabled,
|
||||
CTLFLAG_RW, &ugidfw_firstmatch_enabled, 1,
|
||||
"Disable/enable match first rule functionality");
|
||||
|
||||
static int
|
||||
ugidfw_rule_valid(struct mac_bsdextended_rule *rule)
|
||||
{
|
||||
|
||||
if ((rule->mbr_subject.mbs_flags | MBS_ALL_FLAGS) != MBS_ALL_FLAGS)
|
||||
return (EINVAL);
|
||||
if ((rule->mbr_subject.mbs_neg | MBS_ALL_FLAGS) != MBS_ALL_FLAGS)
|
||||
return (EINVAL);
|
||||
if ((rule->mbr_object.mbo_flags | MBO_ALL_FLAGS) != MBO_ALL_FLAGS)
|
||||
return (EINVAL);
|
||||
if ((rule->mbr_object.mbo_neg | MBO_ALL_FLAGS) != MBO_ALL_FLAGS)
|
||||
return (EINVAL);
|
||||
if ((rule->mbr_object.mbo_neg | MBO_TYPE_DEFINED) &&
|
||||
(rule->mbr_object.mbo_type | MBO_ALL_TYPE) != MBO_ALL_TYPE)
|
||||
return (EINVAL);
|
||||
if ((rule->mbr_mode | MBI_ALLPERM) != MBI_ALLPERM)
|
||||
return (EINVAL);
|
||||
return (0);
|
||||
}
|
||||
|
||||
static int
|
||||
sysctl_rule(SYSCTL_HANDLER_ARGS)
|
||||
{
|
||||
struct mac_bsdextended_rule temprule, *ruleptr;
|
||||
u_int namelen;
|
||||
int error, index, *name;
|
||||
|
||||
error = 0;
|
||||
name = (int *)arg1;
|
||||
namelen = arg2;
|
||||
if (namelen != 1)
|
||||
return (EINVAL);
|
||||
index = name[0];
|
||||
if (index >= MAC_BSDEXTENDED_MAXRULES)
|
||||
return (ENOENT);
|
||||
|
||||
ruleptr = NULL;
|
||||
if (req->newptr && req->newlen != 0) {
|
||||
error = SYSCTL_IN(req, &temprule, sizeof(temprule));
|
||||
if (error)
|
||||
return (error);
|
||||
ruleptr = malloc(sizeof(*ruleptr), M_MACBSDEXTENDED,
|
||||
M_WAITOK | M_ZERO);
|
||||
}
|
||||
|
||||
mtx_lock(&ugidfw_mtx);
|
||||
if (req->oldptr) {
|
||||
if (index < 0 || index > rule_slots + 1) {
|
||||
error = ENOENT;
|
||||
goto out;
|
||||
}
|
||||
if (rules[index] == NULL) {
|
||||
error = ENOENT;
|
||||
goto out;
|
||||
}
|
||||
temprule = *rules[index];
|
||||
}
|
||||
if (req->newptr && req->newlen == 0) {
|
||||
KASSERT(ruleptr == NULL, ("sysctl_rule: ruleptr != NULL"));
|
||||
ruleptr = rules[index];
|
||||
if (ruleptr == NULL) {
|
||||
error = ENOENT;
|
||||
goto out;
|
||||
}
|
||||
rule_count--;
|
||||
rules[index] = NULL;
|
||||
} else if (req->newptr) {
|
||||
error = ugidfw_rule_valid(&temprule);
|
||||
if (error)
|
||||
goto out;
|
||||
if (rules[index] == NULL) {
|
||||
*ruleptr = temprule;
|
||||
rules[index] = ruleptr;
|
||||
ruleptr = NULL;
|
||||
if (index + 1 > rule_slots)
|
||||
rule_slots = index + 1;
|
||||
rule_count++;
|
||||
} else
|
||||
*rules[index] = temprule;
|
||||
}
|
||||
out:
|
||||
mtx_unlock(&ugidfw_mtx);
|
||||
if (ruleptr != NULL)
|
||||
free(ruleptr, M_MACBSDEXTENDED);
|
||||
if (req->oldptr && error == 0)
|
||||
error = SYSCTL_OUT(req, &temprule, sizeof(temprule));
|
||||
return (error);
|
||||
}
|
||||
|
||||
SYSCTL_NODE(_security_mac_bsdextended, OID_AUTO, rules, CTLFLAG_RW,
|
||||
sysctl_rule, "BSD extended MAC rules");
|
||||
|
||||
static void
|
||||
ugidfw_init(struct mac_policy_conf *mpc)
|
||||
{
|
||||
|
||||
mtx_init(&ugidfw_mtx, "mac_bsdextended lock", NULL, MTX_DEF);
|
||||
}
|
||||
|
||||
static void
|
||||
ugidfw_destroy(struct mac_policy_conf *mpc)
|
||||
{
|
||||
|
||||
mtx_destroy(&ugidfw_mtx);
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_rulecheck(struct mac_bsdextended_rule *rule,
|
||||
struct ucred *cred, struct vnode *vp, struct vattr *vap, int acc_mode)
|
||||
{
|
||||
int mac_granted, match, priv_granted;
|
||||
int i;
|
||||
|
||||
/*
|
||||
* Is there a subject match?
|
||||
*/
|
||||
mtx_assert(&ugidfw_mtx, MA_OWNED);
|
||||
if (rule->mbr_subject.mbs_flags & MBS_UID_DEFINED) {
|
||||
match = ((cred->cr_uid <= rule->mbr_subject.mbs_uid_max &&
|
||||
cred->cr_uid >= rule->mbr_subject.mbs_uid_min) ||
|
||||
(cred->cr_ruid <= rule->mbr_subject.mbs_uid_max &&
|
||||
cred->cr_ruid >= rule->mbr_subject.mbs_uid_min) ||
|
||||
(cred->cr_svuid <= rule->mbr_subject.mbs_uid_max &&
|
||||
cred->cr_svuid >= rule->mbr_subject.mbs_uid_min));
|
||||
if (rule->mbr_subject.mbs_neg & MBS_UID_DEFINED)
|
||||
match = !match;
|
||||
if (!match)
|
||||
return (0);
|
||||
}
|
||||
|
||||
if (rule->mbr_subject.mbs_flags & MBS_GID_DEFINED) {
|
||||
match = ((cred->cr_rgid <= rule->mbr_subject.mbs_gid_max &&
|
||||
cred->cr_rgid >= rule->mbr_subject.mbs_gid_min) ||
|
||||
(cred->cr_svgid <= rule->mbr_subject.mbs_gid_max &&
|
||||
cred->cr_svgid >= rule->mbr_subject.mbs_gid_min));
|
||||
if (!match) {
|
||||
for (i = 0; i < cred->cr_ngroups; i++) {
|
||||
if (cred->cr_groups[i]
|
||||
<= rule->mbr_subject.mbs_gid_max &&
|
||||
cred->cr_groups[i]
|
||||
>= rule->mbr_subject.mbs_gid_min) {
|
||||
match = 1;
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
if (rule->mbr_subject.mbs_neg & MBS_GID_DEFINED)
|
||||
match = !match;
|
||||
if (!match)
|
||||
return (0);
|
||||
}
|
||||
|
||||
if (rule->mbr_subject.mbs_flags & MBS_PRISON_DEFINED) {
|
||||
match = (cred->cr_prison != NULL &&
|
||||
cred->cr_prison->pr_id == rule->mbr_subject.mbs_prison);
|
||||
if (rule->mbr_subject.mbs_neg & MBS_PRISON_DEFINED)
|
||||
match = !match;
|
||||
if (!match)
|
||||
return (0);
|
||||
}
|
||||
|
||||
/*
|
||||
* Is there an object match?
|
||||
*/
|
||||
if (rule->mbr_object.mbo_flags & MBO_UID_DEFINED) {
|
||||
match = (vap->va_uid <= rule->mbr_object.mbo_uid_max &&
|
||||
vap->va_uid >= rule->mbr_object.mbo_uid_min);
|
||||
if (rule->mbr_object.mbo_neg & MBO_UID_DEFINED)
|
||||
match = !match;
|
||||
if (!match)
|
||||
return (0);
|
||||
}
|
||||
|
||||
if (rule->mbr_object.mbo_flags & MBO_GID_DEFINED) {
|
||||
match = (vap->va_gid <= rule->mbr_object.mbo_gid_max &&
|
||||
vap->va_gid >= rule->mbr_object.mbo_gid_min);
|
||||
if (rule->mbr_object.mbo_neg & MBO_GID_DEFINED)
|
||||
match = !match;
|
||||
if (!match)
|
||||
return (0);
|
||||
}
|
||||
|
||||
if (rule->mbr_object.mbo_flags & MBO_FSID_DEFINED) {
|
||||
match = (bcmp(&(vp->v_mount->mnt_stat.f_fsid),
|
||||
&(rule->mbr_object.mbo_fsid),
|
||||
sizeof(rule->mbr_object.mbo_fsid)) == 0);
|
||||
if (rule->mbr_object.mbo_neg & MBO_FSID_DEFINED)
|
||||
match = !match;
|
||||
if (!match)
|
||||
return (0);
|
||||
}
|
||||
|
||||
if (rule->mbr_object.mbo_flags & MBO_SUID) {
|
||||
match = (vap->va_mode & S_ISUID);
|
||||
if (rule->mbr_object.mbo_neg & MBO_SUID)
|
||||
match = !match;
|
||||
if (!match)
|
||||
return (0);
|
||||
}
|
||||
|
||||
if (rule->mbr_object.mbo_flags & MBO_SGID) {
|
||||
match = (vap->va_mode & S_ISGID);
|
||||
if (rule->mbr_object.mbo_neg & MBO_SGID)
|
||||
match = !match;
|
||||
if (!match)
|
||||
return (0);
|
||||
}
|
||||
|
||||
if (rule->mbr_object.mbo_flags & MBO_UID_SUBJECT) {
|
||||
match = (vap->va_uid == cred->cr_uid ||
|
||||
vap->va_uid == cred->cr_ruid ||
|
||||
vap->va_uid == cred->cr_svuid);
|
||||
if (rule->mbr_object.mbo_neg & MBO_UID_SUBJECT)
|
||||
match = !match;
|
||||
if (!match)
|
||||
return (0);
|
||||
}
|
||||
|
||||
if (rule->mbr_object.mbo_flags & MBO_GID_SUBJECT) {
|
||||
match = (groupmember(vap->va_gid, cred) ||
|
||||
vap->va_gid == cred->cr_rgid ||
|
||||
vap->va_gid == cred->cr_svgid);
|
||||
if (rule->mbr_object.mbo_neg & MBO_GID_SUBJECT)
|
||||
match = !match;
|
||||
if (!match)
|
||||
return (0);
|
||||
}
|
||||
|
||||
if (rule->mbr_object.mbo_flags & MBO_TYPE_DEFINED) {
|
||||
switch (vap->va_type) {
|
||||
case VREG:
|
||||
match = (rule->mbr_object.mbo_type & MBO_TYPE_REG);
|
||||
break;
|
||||
case VDIR:
|
||||
match = (rule->mbr_object.mbo_type & MBO_TYPE_DIR);
|
||||
break;
|
||||
case VBLK:
|
||||
match = (rule->mbr_object.mbo_type & MBO_TYPE_BLK);
|
||||
break;
|
||||
case VCHR:
|
||||
match = (rule->mbr_object.mbo_type & MBO_TYPE_CHR);
|
||||
break;
|
||||
case VLNK:
|
||||
match = (rule->mbr_object.mbo_type & MBO_TYPE_LNK);
|
||||
break;
|
||||
case VSOCK:
|
||||
match = (rule->mbr_object.mbo_type & MBO_TYPE_SOCK);
|
||||
break;
|
||||
case VFIFO:
|
||||
match = (rule->mbr_object.mbo_type & MBO_TYPE_FIFO);
|
||||
break;
|
||||
default:
|
||||
match = 0;
|
||||
}
|
||||
if (rule->mbr_object.mbo_neg & MBO_TYPE_DEFINED)
|
||||
match = !match;
|
||||
if (!match)
|
||||
return (0);
|
||||
}
|
||||
|
||||
/*
|
||||
* MBI_APPEND should not be here as it should get converted to
|
||||
* MBI_WRITE.
|
||||
*/
|
||||
priv_granted = 0;
|
||||
mac_granted = rule->mbr_mode;
|
||||
if ((acc_mode & MBI_ADMIN) && (mac_granted & MBI_ADMIN) == 0 &&
|
||||
priv_check_cred(cred, PRIV_VFS_ADMIN, 0) == 0)
|
||||
priv_granted |= MBI_ADMIN;
|
||||
if ((acc_mode & MBI_EXEC) && (mac_granted & MBI_EXEC) == 0 &&
|
||||
priv_check_cred(cred, (vap->va_type == VDIR) ? PRIV_VFS_LOOKUP :
|
||||
PRIV_VFS_EXEC, 0) == 0)
|
||||
priv_granted |= MBI_EXEC;
|
||||
if ((acc_mode & MBI_READ) && (mac_granted & MBI_READ) == 0 &&
|
||||
priv_check_cred(cred, PRIV_VFS_READ, 0) == 0)
|
||||
priv_granted |= MBI_READ;
|
||||
if ((acc_mode & MBI_STAT) && (mac_granted & MBI_STAT) == 0 &&
|
||||
priv_check_cred(cred, PRIV_VFS_STAT, 0) == 0)
|
||||
priv_granted |= MBI_STAT;
|
||||
if ((acc_mode & MBI_WRITE) && (mac_granted & MBI_WRITE) == 0 &&
|
||||
priv_check_cred(cred, PRIV_VFS_WRITE, 0) == 0)
|
||||
priv_granted |= MBI_WRITE;
|
||||
/*
|
||||
* Is the access permitted?
|
||||
*/
|
||||
if (((mac_granted | priv_granted) & acc_mode) != acc_mode) {
|
||||
if (ugidfw_logging)
|
||||
log(LOG_AUTHPRIV, "mac_bsdextended: %d:%d request %d"
|
||||
" on %d:%d failed. \n", cred->cr_ruid,
|
||||
cred->cr_rgid, acc_mode, vap->va_uid,
|
||||
vap->va_gid);
|
||||
return (EACCES);
|
||||
}
|
||||
|
||||
/*
|
||||
* If the rule matched, permits access, and first match is enabled,
|
||||
* return success.
|
||||
*/
|
||||
if (ugidfw_firstmatch_enabled)
|
||||
return (EJUSTRETURN);
|
||||
else
|
||||
return (0);
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_check(struct ucred *cred, struct vnode *vp, struct vattr *vap,
|
||||
int acc_mode)
|
||||
{
|
||||
int error, i;
|
||||
|
||||
/*
|
||||
* Since we do not separately handle append, map append to write.
|
||||
*/
|
||||
if (acc_mode & MBI_APPEND) {
|
||||
acc_mode &= ~MBI_APPEND;
|
||||
acc_mode |= MBI_WRITE;
|
||||
}
|
||||
mtx_lock(&ugidfw_mtx);
|
||||
for (i = 0; i < rule_slots; i++) {
|
||||
if (rules[i] == NULL)
|
||||
continue;
|
||||
error = ugidfw_rulecheck(rules[i], cred,
|
||||
vp, vap, acc_mode);
|
||||
if (error == EJUSTRETURN)
|
||||
break;
|
||||
if (error) {
|
||||
mtx_unlock(&ugidfw_mtx);
|
||||
return (error);
|
||||
}
|
||||
}
|
||||
mtx_unlock(&ugidfw_mtx);
|
||||
return (0);
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_check_vp(struct ucred *cred, struct vnode *vp, int acc_mode)
|
||||
{
|
||||
int error;
|
||||
struct vattr vap;
|
||||
|
||||
if (!ugidfw_enabled)
|
||||
return (0);
|
||||
error = VOP_GETATTR(vp, &vap, cred);
|
||||
if (error)
|
||||
return (error);
|
||||
return (ugidfw_check(cred, vp, &vap, acc_mode));
|
||||
}
|
||||
|
||||
/*
|
||||
* Object-specific entry point implementations are sorted alphabetically by
|
||||
* object type and then by operation.
|
||||
*/
|
||||
static int
|
||||
ugidfw_system_check_acct(struct ucred *cred, struct vnode *vp,
|
||||
struct label *vplabel)
|
||||
{
|
||||
|
||||
if (vp != NULL)
|
||||
return (ugidfw_check_vp(cred, vp, MBI_WRITE));
|
||||
else
|
||||
return (0);
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_system_check_auditctl(struct ucred *cred, struct vnode *vp,
|
||||
struct label *vplabel)
|
||||
{
|
||||
|
||||
if (vp != NULL)
|
||||
return (ugidfw_check_vp(cred, vp, MBI_WRITE));
|
||||
else
|
||||
return (0);
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_system_check_swapon(struct ucred *cred, struct vnode *vp,
|
||||
struct label *vplabel)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, vp, MBI_WRITE));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_access(struct ucred *cred, struct vnode *vp,
|
||||
struct label *vplabel, int acc_mode)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, vp, acc_mode));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_chdir(struct ucred *cred, struct vnode *dvp,
|
||||
struct label *dvplabel)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, dvp, MBI_EXEC));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_chroot(struct ucred *cred, struct vnode *dvp,
|
||||
struct label *dvplabel)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, dvp, MBI_EXEC));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_check_create_vnode(struct ucred *cred, struct vnode *dvp,
|
||||
struct label *dvplabel, struct componentname *cnp, struct vattr *vap)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, dvp, MBI_WRITE));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_deleteacl(struct ucred *cred, struct vnode *vp,
|
||||
struct label *vplabel, acl_type_t type)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, vp, MBI_ADMIN));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_deleteextattr(struct ucred *cred, struct vnode *vp,
|
||||
struct label *vplabel, int attrnamespace, const char *name)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, vp, MBI_WRITE));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_exec(struct ucred *cred, struct vnode *vp,
|
||||
struct label *vplabel, struct image_params *imgp,
|
||||
struct label *execlabel)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, vp, MBI_READ|MBI_EXEC));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_getacl(struct ucred *cred, struct vnode *vp,
|
||||
struct label *vplabel, acl_type_t type)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, vp, MBI_STAT));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_getextattr(struct ucred *cred, struct vnode *vp,
|
||||
struct label *vplabel, int attrnamespace, const char *name,
|
||||
struct uio *uio)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, vp, MBI_READ));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_link(struct ucred *cred, struct vnode *dvp,
|
||||
struct label *dvplabel, struct vnode *vp, struct label *label,
|
||||
struct componentname *cnp)
|
||||
{
|
||||
int error;
|
||||
|
||||
error = ugidfw_check_vp(cred, dvp, MBI_WRITE);
|
||||
if (error)
|
||||
return (error);
|
||||
error = ugidfw_check_vp(cred, vp, MBI_WRITE);
|
||||
if (error)
|
||||
return (error);
|
||||
return (0);
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_listextattr(struct ucred *cred, struct vnode *vp,
|
||||
struct label *vplabel, int attrnamespace)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, vp, MBI_READ));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_lookup(struct ucred *cred, struct vnode *dvp,
|
||||
struct label *dvplabel, struct componentname *cnp)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, dvp, MBI_EXEC));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_open(struct ucred *cred, struct vnode *vp,
|
||||
struct label *vplabel, int acc_mode)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, vp, acc_mode));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_readdir(struct ucred *cred, struct vnode *dvp,
|
||||
struct label *dvplabel)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, dvp, MBI_READ));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_readdlink(struct ucred *cred, struct vnode *vp,
|
||||
struct label *vplabel)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, vp, MBI_READ));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_rename_from(struct ucred *cred, struct vnode *dvp,
|
||||
struct label *dvplabel, struct vnode *vp, struct label *vplabel,
|
||||
struct componentname *cnp)
|
||||
{
|
||||
int error;
|
||||
|
||||
error = ugidfw_check_vp(cred, dvp, MBI_WRITE);
|
||||
if (error)
|
||||
return (error);
|
||||
return (ugidfw_check_vp(cred, vp, MBI_WRITE));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_rename_to(struct ucred *cred, struct vnode *dvp,
|
||||
struct label *dvplabel, struct vnode *vp, struct label *vplabel,
|
||||
int samedir, struct componentname *cnp)
|
||||
{
|
||||
int error;
|
||||
|
||||
error = ugidfw_check_vp(cred, dvp, MBI_WRITE);
|
||||
if (error)
|
||||
return (error);
|
||||
if (vp != NULL)
|
||||
error = ugidfw_check_vp(cred, vp, MBI_WRITE);
|
||||
return (error);
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_revoke(struct ucred *cred, struct vnode *vp,
|
||||
struct label *vplabel)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, vp, MBI_ADMIN));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_check_setacl_vnode(struct ucred *cred, struct vnode *vp,
|
||||
struct label *vplabel, acl_type_t type, struct acl *acl)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, vp, MBI_ADMIN));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_setextattr(struct ucred *cred, struct vnode *vp,
|
||||
struct label *vplabel, int attrnamespace, const char *name,
|
||||
struct uio *uio)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, vp, MBI_WRITE));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_setflags(struct ucred *cred, struct vnode *vp,
|
||||
struct label *vplabel, u_long flags)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, vp, MBI_ADMIN));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_setmode(struct ucred *cred, struct vnode *vp,
|
||||
struct label *vplabel, mode_t mode)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, vp, MBI_ADMIN));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_setowner(struct ucred *cred, struct vnode *vp,
|
||||
struct label *vplabel, uid_t uid, gid_t gid)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, vp, MBI_ADMIN));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_setutimes(struct ucred *cred, struct vnode *vp,
|
||||
struct label *vplabel, struct timespec atime, struct timespec utime)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(cred, vp, MBI_ADMIN));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_stat(struct ucred *active_cred,
|
||||
struct ucred *file_cred, struct vnode *vp, struct label *vplabel)
|
||||
{
|
||||
|
||||
return (ugidfw_check_vp(active_cred, vp, MBI_STAT));
|
||||
}
|
||||
|
||||
static int
|
||||
ugidfw_vnode_check_unlink(struct ucred *cred, struct vnode *dvp,
|
||||
struct label *dvplabel, struct vnode *vp, struct label *vplabel,
|
||||
struct componentname *cnp)
|
||||
{
|
||||
int error;
|
||||
|
||||
error = ugidfw_check_vp(cred, dvp, MBI_WRITE);
|
||||
if (error)
|
||||
return (error);
|
||||
return (ugidfw_check_vp(cred, vp, MBI_WRITE));
|
||||
}
|
||||
|
||||
static struct mac_policy_ops ugidfw_ops =
|
||||
{
|
||||
.mpo_destroy = ugidfw_destroy,
|
||||
.mpo_init = ugidfw_init,
|
||||
.mpo_system_check_acct = ugidfw_system_check_acct,
|
||||
.mpo_system_check_auditctl = ugidfw_system_check_auditctl,
|
||||
.mpo_system_check_swapon = ugidfw_system_check_swapon,
|
||||
.mpo_vnode_check_access = ugidfw_vnode_check_access,
|
||||
.mpo_vnode_check_chdir = ugidfw_vnode_check_chdir,
|
||||
.mpo_vnode_check_chroot = ugidfw_vnode_check_chroot,
|
||||
.mpo_vnode_check_create = ugidfw_check_create_vnode,
|
||||
.mpo_vnode_check_deleteacl = ugidfw_vnode_check_deleteacl,
|
||||
.mpo_vnode_check_deleteextattr = ugidfw_vnode_check_deleteextattr,
|
||||
.mpo_vnode_check_exec = ugidfw_vnode_check_exec,
|
||||
.mpo_vnode_check_getacl = ugidfw_vnode_check_getacl,
|
||||
.mpo_vnode_check_getextattr = ugidfw_vnode_check_getextattr,
|
||||
.mpo_vnode_check_link = ugidfw_vnode_check_link,
|
||||
.mpo_vnode_check_listextattr = ugidfw_vnode_check_listextattr,
|
||||
.mpo_vnode_check_lookup = ugidfw_vnode_check_lookup,
|
||||
.mpo_vnode_check_open = ugidfw_vnode_check_open,
|
||||
.mpo_vnode_check_readdir = ugidfw_vnode_check_readdir,
|
||||
.mpo_vnode_check_readlink = ugidfw_vnode_check_readdlink,
|
||||
.mpo_vnode_check_rename_from = ugidfw_vnode_check_rename_from,
|
||||
.mpo_vnode_check_rename_to = ugidfw_vnode_check_rename_to,
|
||||
.mpo_vnode_check_revoke = ugidfw_vnode_check_revoke,
|
||||
.mpo_vnode_check_setacl = ugidfw_check_setacl_vnode,
|
||||
.mpo_vnode_check_setextattr = ugidfw_vnode_check_setextattr,
|
||||
.mpo_vnode_check_setflags = ugidfw_vnode_check_setflags,
|
||||
.mpo_vnode_check_setmode = ugidfw_vnode_check_setmode,
|
||||
.mpo_vnode_check_setowner = ugidfw_vnode_check_setowner,
|
||||
.mpo_vnode_check_setutimes = ugidfw_vnode_check_setutimes,
|
||||
.mpo_vnode_check_stat = ugidfw_vnode_check_stat,
|
||||
.mpo_vnode_check_unlink = ugidfw_vnode_check_unlink,
|
||||
};
|
||||
|
||||
MAC_POLICY_SET(&ugidfw_ops, mac_bsdextended, "TrustedBSD MAC/BSD Extended",
|
||||
MPC_LOADTIME_FLAG_UNLOADOK, NULL, 0);
|
||||
Loading…
Reference in New Issue
Block a user