0304c73163
by creating a child jail, which is visible to that jail and to any parent jails. Child jails may be restricted more than their parents, but never less. Jail names reflect this hierarchy, being MIB-style dot-separated strings. Every thread now points to a jail, the default being prison0, which contains information about the physical system. Prison0's root directory is the same as rootvnode; its hostname is the same as the global hostname, and its securelevel replaces the global securelevel. Note that the variable "securelevel" has actually gone away, which should not cause any problems for code that properly uses securelevel_gt() and securelevel_ge(). Some jail-related permissions that were kept in global variables and set via sysctls are now per-jail settings. The sysctls still exist for backward compatibility, used only by the now-deprecated jail(2) system call. Approved by: bz (mentor)
527 lines
15 KiB
C
527 lines
15 KiB
C
/*-
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* Copyright (c) 1999-2002, 2007-2008 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/proc.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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#include <security/mac_bsdextended/ugidfw_internal.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,
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CTLFLAG_MPSAFE | CTLFLAG_RW, 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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int i;
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for (i = 0; i < MAC_BSDEXTENDED_MAXRULES; i++) {
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if (rules[i] != NULL)
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free(rules[i], M_MACBSDEXTENDED);
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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 =
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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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|
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/*
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|
* If the rule matched, permits access, and first match is enabled,
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|
* return success.
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|
*/
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|
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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}
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|
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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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{
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int error, i;
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/*
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* Since we do not separately handle append, map append to write.
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*/
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if (acc_mode & MBI_APPEND) {
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acc_mode &= ~MBI_APPEND;
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acc_mode |= MBI_WRITE;
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}
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mtx_lock(&ugidfw_mtx);
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for (i = 0; i < rule_slots; i++) {
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if (rules[i] == NULL)
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continue;
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error = ugidfw_rulecheck(rules[i], cred,
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vp, vap, acc_mode);
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if (error == EJUSTRETURN)
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break;
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if (error) {
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mtx_unlock(&ugidfw_mtx);
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return (error);
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}
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}
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mtx_unlock(&ugidfw_mtx);
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return (0);
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}
|
|
|
|
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));
|
|
}
|
|
|
|
int
|
|
ugidfw_accmode2mbi(accmode_t accmode)
|
|
{
|
|
int mbi;
|
|
|
|
mbi = 0;
|
|
if (accmode & VEXEC)
|
|
mbi |= MBI_EXEC;
|
|
if (accmode & VWRITE)
|
|
mbi |= MBI_WRITE;
|
|
if (accmode & VREAD)
|
|
mbi |= MBI_READ;
|
|
if (accmode & VADMIN_PERMS)
|
|
mbi |= MBI_ADMIN;
|
|
if (accmode & VSTAT_PERMS)
|
|
mbi |= MBI_STAT;
|
|
if (accmode & VAPPEND)
|
|
mbi |= MBI_APPEND;
|
|
return (mbi);
|
|
}
|
|
|
|
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);
|