1320 lines
29 KiB
C
1320 lines
29 KiB
C
/*-
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* Copyright (c) 2002-2005 Networks Associates Technology, Inc.
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* All rights reserved.
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*
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* This software was developed for the FreeBSD Project by Network Associates
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* Laboratories, the Security Research Division of Network Associates, Inc.
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* under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
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* DARPA CHATS research program.
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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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#include <sys/param.h>
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#include <sys/errno.h>
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#include <sys/time.h>
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#include <sys/sysctl.h>
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#include <sys/ucred.h>
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#include <sys/mount.h>
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#include <security/mac_bsdextended/mac_bsdextended.h>
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#include <grp.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "ugidfw.h"
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/*
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* Text format for rules: rules contain subject and object elements, mode.
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* The total form is "subject [s_element] object [o_element] mode [mode]".
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* At least * one of a uid or gid entry must be present; both may also be
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* present.
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*/
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#define MIB "security.mac.bsdextended"
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int
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bsde_rule_to_string(struct mac_bsdextended_rule *rule, char *buf, size_t buflen)
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{
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struct group *grp;
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struct passwd *pwd;
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struct statfs *mntbuf;
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char *cur, type[sizeof(rule->mbr_object.mbo_type) * CHAR_BIT + 1];
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size_t left, len;
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int anymode, unknownmode, numfs, i, notdone;
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cur = buf;
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left = buflen;
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len = snprintf(cur, left, "subject ");
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if (len < 0 || len > left)
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goto truncated;
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left -= len;
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cur += len;
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if (rule->mbr_subject.mbs_flags) {
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if (rule->mbr_subject.mbs_neg == MBS_ALL_FLAGS) {
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len = snprintf(cur, left, "not ");
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if (len < 0 || len > left)
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goto truncated;
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left -= len;
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cur += len;
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notdone = 1;
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} else {
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notdone = 0;
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}
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if (!notdone && (rule->mbr_subject.mbs_neg & MBO_UID_DEFINED)) {
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len = snprintf(cur, left, "! ");
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if (len < 0 || len > left)
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goto truncated;
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left -= len;
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cur += len;
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}
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if (rule->mbr_subject.mbs_flags & MBO_UID_DEFINED) {
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pwd = getpwuid(rule->mbr_subject.mbs_uid_min);
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if (pwd != NULL) {
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len = snprintf(cur, left, "uid %s",
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pwd->pw_name);
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if (len < 0 || len > left)
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goto truncated;
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left -= len;
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cur += len;
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} else {
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len = snprintf(cur, left, "uid %u",
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rule->mbr_subject.mbs_uid_min);
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if (len < 0 || len > left)
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goto truncated;
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left -= len;
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cur += len;
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}
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if (rule->mbr_subject.mbs_uid_min !=
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rule->mbr_subject.mbs_uid_max) {
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pwd = getpwuid(rule->mbr_subject.mbs_uid_max);
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if (pwd != NULL) {
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len = snprintf(cur, left, ":%s ",
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pwd->pw_name);
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if (len < 0 || len > left)
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goto truncated;
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left -= len;
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cur += len;
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} else {
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len = snprintf(cur, left, ":%u ",
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rule->mbr_subject.mbs_uid_max);
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if (len < 0 || len > left)
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goto truncated;
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left -= len;
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cur += len;
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}
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} else {
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len = snprintf(cur, left, " ");
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if (len < 0 || len > left)
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goto truncated;
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left -= len;
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cur += len;
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}
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}
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if (!notdone && (rule->mbr_subject.mbs_neg & MBO_GID_DEFINED)) {
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len = snprintf(cur, left, "! ");
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if (len < 0 || len > left)
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goto truncated;
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left -= len;
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cur += len;
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}
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if (rule->mbr_subject.mbs_flags & MBO_GID_DEFINED) {
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grp = getgrgid(rule->mbr_subject.mbs_gid_min);
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if (grp != NULL) {
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len = snprintf(cur, left, "gid %s",
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grp->gr_name);
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if (len < 0 || len > left)
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goto truncated;
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left -= len;
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cur += len;
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} else {
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len = snprintf(cur, left, "gid %u",
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rule->mbr_subject.mbs_gid_min);
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if (len < 0 || len > left)
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goto truncated;
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left -= len;
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cur += len;
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}
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if (rule->mbr_subject.mbs_gid_min !=
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rule->mbr_subject.mbs_gid_max) {
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grp = getgrgid(rule->mbr_subject.mbs_gid_max);
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if (grp != NULL) {
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len = snprintf(cur, left, ":%s ",
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grp->gr_name);
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if (len < 0 || len > left)
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goto truncated;
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left -= len;
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cur += len;
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} else {
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len = snprintf(cur, left, ":%u ",
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rule->mbr_subject.mbs_gid_max);
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if (len < 0 || len > left)
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goto truncated;
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left -= len;
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cur += len;
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}
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} else {
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len = snprintf(cur, left, " ");
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if (len < 0 || len > left)
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goto truncated;
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left -= len;
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cur += len;
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}
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}
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if (!notdone && (rule->mbr_subject.mbs_neg & MBS_PRISON_DEFINED)) {
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len = snprintf(cur, left, "! ");
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if (len < 0 || len > left)
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goto truncated;
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left -= len;
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cur += len;
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}
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if (rule->mbr_subject.mbs_flags & MBS_PRISON_DEFINED) {
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len = snprintf(cur, left, "jailid %d ",
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rule->mbr_subject.mbs_prison);
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if (len < 0 || len > left)
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goto truncated;
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left -= len;
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cur += len;
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}
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}
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len = snprintf(cur, left, "object ");
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if (len < 0 || len > left)
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goto truncated;
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left -= len;
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cur += len;
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if (rule->mbr_object.mbo_flags) {
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if (rule->mbr_object.mbo_neg == MBO_ALL_FLAGS) {
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len = snprintf(cur, left, "not ");
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if (len < 0 || len > left)
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goto truncated;
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left -= len;
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cur += len;
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notdone = 1;
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} else {
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notdone = 0;
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}
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if (!notdone && (rule->mbr_object.mbo_neg & MBO_UID_DEFINED)) {
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len = snprintf(cur, left, "! ");
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if (len < 0 || len > left)
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goto truncated;
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left -= len;
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cur += len;
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}
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if (rule->mbr_object.mbo_flags & MBO_UID_DEFINED) {
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pwd = getpwuid(rule->mbr_object.mbo_uid_min);
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if (pwd != NULL) {
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len = snprintf(cur, left, "uid %s",
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pwd->pw_name);
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if (len < 0 || len > left)
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goto truncated;
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left -= len;
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cur += len;
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} else {
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len = snprintf(cur, left, "uid %u",
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rule->mbr_object.mbo_uid_min);
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if (len < 0 || len > left)
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goto truncated;
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left -= len;
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cur += len;
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}
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if (rule->mbr_object.mbo_uid_min !=
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rule->mbr_object.mbo_uid_max) {
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pwd = getpwuid(rule->mbr_object.mbo_uid_max);
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if (pwd != NULL) {
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len = snprintf(cur, left, ":%s ",
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pwd->pw_name);
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if (len < 0 || len > left)
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goto truncated;
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left -= len;
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cur += len;
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} else {
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len = snprintf(cur, left, ":%u ",
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rule->mbr_object.mbo_uid_max);
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if (len < 0 || len > left)
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goto truncated;
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left -= len;
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cur += len;
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}
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} else {
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len = snprintf(cur, left, " ");
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if (len < 0 || len > left)
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|
goto truncated;
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|
left -= len;
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|
cur += len;
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|
}
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|
}
|
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if (!notdone && (rule->mbr_object.mbo_neg & MBO_GID_DEFINED)) {
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len = snprintf(cur, left, "! ");
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if (len < 0 || len > left)
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goto truncated;
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|
left -= len;
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cur += len;
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}
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if (rule->mbr_object.mbo_flags & MBO_GID_DEFINED) {
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grp = getgrgid(rule->mbr_object.mbo_gid_min);
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if (grp != NULL) {
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len = snprintf(cur, left, "gid %s",
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grp->gr_name);
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if (len < 0 || len > left)
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goto truncated;
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|
left -= len;
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cur += len;
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} else {
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len = snprintf(cur, left, "gid %u",
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rule->mbr_object.mbo_gid_min);
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if (len < 0 || len > left)
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goto truncated;
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|
left -= len;
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|
cur += len;
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}
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if (rule->mbr_object.mbo_gid_min !=
|
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rule->mbr_object.mbo_gid_max) {
|
|
grp = getgrgid(rule->mbr_object.mbo_gid_max);
|
|
if (grp != NULL) {
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|
len = snprintf(cur, left, ":%s ",
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grp->gr_name);
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|
if (len < 0 || len > left)
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|
goto truncated;
|
|
left -= len;
|
|
cur += len;
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|
} else {
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|
len = snprintf(cur, left, ":%u ",
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rule->mbr_object.mbo_gid_max);
|
|
if (len < 0 || len > left)
|
|
goto truncated;
|
|
left -= len;
|
|
cur += len;
|
|
}
|
|
} else {
|
|
len = snprintf(cur, left, " ");
|
|
if (len < 0 || len > left)
|
|
goto truncated;
|
|
left -= len;
|
|
cur += len;
|
|
}
|
|
}
|
|
if (!notdone && (rule->mbr_object.mbo_neg & MBO_FSID_DEFINED)) {
|
|
len = snprintf(cur, left, "! ");
|
|
if (len < 0 || len > left)
|
|
goto truncated;
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|
left -= len;
|
|
cur += len;
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|
}
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if (rule->mbr_object.mbo_flags & MBO_FSID_DEFINED) {
|
|
numfs = getmntinfo(&mntbuf, MNT_NOWAIT);
|
|
for (i = 0; i < numfs; i++)
|
|
if (memcmp(&(rule->mbr_object.mbo_fsid),
|
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&(mntbuf[i].f_fsid),
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sizeof(mntbuf[i].f_fsid)) == 0)
|
|
break;
|
|
len = snprintf(cur, left, "filesys %s ",
|
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i == numfs ? "???" : mntbuf[i].f_mntonname);
|
|
if (len < 0 || len > left)
|
|
goto truncated;
|
|
left -= len;
|
|
cur += len;
|
|
}
|
|
if (!notdone && (rule->mbr_object.mbo_neg & MBO_SUID)) {
|
|
len = snprintf(cur, left, "! ");
|
|
if (len < 0 || len > left)
|
|
goto truncated;
|
|
left -= len;
|
|
cur += len;
|
|
}
|
|
if (rule->mbr_object.mbo_flags & MBO_SUID) {
|
|
len = snprintf(cur, left, "suid ");
|
|
if (len < 0 || len > left)
|
|
goto truncated;
|
|
left -= len;
|
|
cur += len;
|
|
}
|
|
if (!notdone && (rule->mbr_object.mbo_neg & MBO_SGID)) {
|
|
len = snprintf(cur, left, "! ");
|
|
if (len < 0 || len > left)
|
|
goto truncated;
|
|
left -= len;
|
|
cur += len;
|
|
}
|
|
if (rule->mbr_object.mbo_flags & MBO_SGID) {
|
|
len = snprintf(cur, left, "sgid ");
|
|
if (len < 0 || len > left)
|
|
goto truncated;
|
|
left -= len;
|
|
cur += len;
|
|
}
|
|
if (!notdone && (rule->mbr_object.mbo_neg & MBO_UID_SUBJECT)) {
|
|
len = snprintf(cur, left, "! ");
|
|
if (len < 0 || len > left)
|
|
goto truncated;
|
|
left -= len;
|
|
cur += len;
|
|
}
|
|
if (rule->mbr_object.mbo_flags & MBO_UID_SUBJECT) {
|
|
len = snprintf(cur, left, "uid_of_subject ");
|
|
if (len < 0 || len > left)
|
|
goto truncated;
|
|
left -= len;
|
|
cur += len;
|
|
}
|
|
if (!notdone && (rule->mbr_object.mbo_neg & MBO_GID_SUBJECT)) {
|
|
len = snprintf(cur, left, "! ");
|
|
if (len < 0 || len > left)
|
|
goto truncated;
|
|
left -= len;
|
|
cur += len;
|
|
}
|
|
if (rule->mbr_object.mbo_flags & MBO_GID_SUBJECT) {
|
|
len = snprintf(cur, left, "gid_of_subject ");
|
|
if (len < 0 || len > left)
|
|
goto truncated;
|
|
left -= len;
|
|
cur += len;
|
|
}
|
|
if (!notdone && (rule->mbr_object.mbo_neg & MBO_TYPE_DEFINED)) {
|
|
len = snprintf(cur, left, "! ");
|
|
if (len < 0 || len > left)
|
|
goto truncated;
|
|
left -= len;
|
|
cur += len;
|
|
}
|
|
if (rule->mbr_object.mbo_flags & MBO_TYPE_DEFINED) {
|
|
i = 0;
|
|
if (rule->mbr_object.mbo_type & MBO_TYPE_REG)
|
|
type[i++] = 'r';
|
|
if (rule->mbr_object.mbo_type & MBO_TYPE_DIR)
|
|
type[i++] = 'd';
|
|
if (rule->mbr_object.mbo_type & MBO_TYPE_BLK)
|
|
type[i++] = 'b';
|
|
if (rule->mbr_object.mbo_type & MBO_TYPE_CHR)
|
|
type[i++] = 'c';
|
|
if (rule->mbr_object.mbo_type & MBO_TYPE_LNK)
|
|
type[i++] = 'l';
|
|
if (rule->mbr_object.mbo_type & MBO_TYPE_SOCK)
|
|
type[i++] = 's';
|
|
if (rule->mbr_object.mbo_type & MBO_TYPE_FIFO)
|
|
type[i++] = 'p';
|
|
if (rule->mbr_object.mbo_type == MBO_ALL_TYPE) {
|
|
i = 0;
|
|
type[i++] = 'a';
|
|
}
|
|
type[i++] = '\0';
|
|
len = snprintf(cur, left, "type %s ", type);
|
|
if (len < 0 || len > left)
|
|
goto truncated;
|
|
left -= len;
|
|
cur += len;
|
|
}
|
|
}
|
|
|
|
len = snprintf(cur, left, "mode ");
|
|
if (len < 0 || len > left)
|
|
goto truncated;
|
|
left -= len;
|
|
cur += len;
|
|
|
|
anymode = (rule->mbr_mode & MBI_ALLPERM);
|
|
unknownmode = (rule->mbr_mode & ~MBI_ALLPERM);
|
|
|
|
if (rule->mbr_mode & MBI_ADMIN) {
|
|
len = snprintf(cur, left, "a");
|
|
if (len < 0 || len > left)
|
|
goto truncated;
|
|
|
|
left -= len;
|
|
cur += len;
|
|
}
|
|
if (rule->mbr_mode & MBI_READ) {
|
|
len = snprintf(cur, left, "r");
|
|
if (len < 0 || len > left)
|
|
goto truncated;
|
|
|
|
left -= len;
|
|
cur += len;
|
|
}
|
|
if (rule->mbr_mode & MBI_STAT) {
|
|
len = snprintf(cur, left, "s");
|
|
if (len < 0 || len > left)
|
|
goto truncated;
|
|
|
|
left -= len;
|
|
cur += len;
|
|
}
|
|
if (rule->mbr_mode & MBI_WRITE) {
|
|
len = snprintf(cur, left, "w");
|
|
if (len < 0 || len > left)
|
|
goto truncated;
|
|
|
|
left -= len;
|
|
cur += len;
|
|
}
|
|
if (rule->mbr_mode & MBI_EXEC) {
|
|
len = snprintf(cur, left, "x");
|
|
if (len < 0 || len > left)
|
|
goto truncated;
|
|
|
|
left -= len;
|
|
cur += len;
|
|
}
|
|
if (!anymode) {
|
|
len = snprintf(cur, left, "n");
|
|
if (len < 0 || len > left)
|
|
goto truncated;
|
|
|
|
left -= len;
|
|
cur += len;
|
|
}
|
|
if (unknownmode) {
|
|
len = snprintf(cur, left, "?");
|
|
if (len < 0 || len > left)
|
|
goto truncated;
|
|
|
|
left -= len;
|
|
cur += len;
|
|
}
|
|
|
|
return (0);
|
|
|
|
truncated:
|
|
return (-1);
|
|
}
|
|
|
|
static int
|
|
bsde_parse_uidrange(char *spec, uid_t *min, uid_t *max,
|
|
size_t buflen, char *errstr){
|
|
struct passwd *pwd;
|
|
uid_t uid1, uid2;
|
|
char *spec1, *spec2, *endp;
|
|
unsigned long value;
|
|
size_t len;
|
|
|
|
spec2 = spec;
|
|
spec1 = strsep(&spec2, ":");
|
|
|
|
pwd = getpwnam(spec1);
|
|
if (pwd != NULL)
|
|
uid1 = pwd->pw_uid;
|
|
else {
|
|
value = strtoul(spec1, &endp, 10);
|
|
if (*endp != '\0') {
|
|
len = snprintf(errstr, buflen,
|
|
"invalid uid: '%s'", spec1);
|
|
return (-1);
|
|
}
|
|
uid1 = value;
|
|
}
|
|
|
|
if (spec2 == NULL) {
|
|
*max = *min = uid1;
|
|
return (0);
|
|
}
|
|
|
|
pwd = getpwnam(spec2);
|
|
if (pwd != NULL)
|
|
uid2 = pwd->pw_uid;
|
|
else {
|
|
value = strtoul(spec2, &endp, 10);
|
|
if (*endp != '\0') {
|
|
len = snprintf(errstr, buflen,
|
|
"invalid uid: '%s'", spec2);
|
|
return (-1);
|
|
}
|
|
uid2 = value;
|
|
}
|
|
|
|
*min = uid1;
|
|
*max = uid2;
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
bsde_parse_gidrange(char *spec, gid_t *min, gid_t *max,
|
|
size_t buflen, char *errstr){
|
|
struct group *grp;
|
|
gid_t gid1, gid2;
|
|
char *spec1, *spec2, *endp;
|
|
unsigned long value;
|
|
size_t len;
|
|
|
|
spec2 = spec;
|
|
spec1 = strsep(&spec2, ":");
|
|
|
|
grp = getgrnam(spec1);
|
|
if (grp != NULL)
|
|
gid1 = grp->gr_gid;
|
|
else {
|
|
value = strtoul(spec1, &endp, 10);
|
|
if (*endp != '\0') {
|
|
len = snprintf(errstr, buflen,
|
|
"invalid gid: '%s'", spec1);
|
|
return (-1);
|
|
}
|
|
gid1 = value;
|
|
}
|
|
|
|
if (spec2 == NULL) {
|
|
*max = *min = gid1;
|
|
return (0);
|
|
}
|
|
|
|
grp = getgrnam(spec2);
|
|
if (grp != NULL)
|
|
gid2 = grp->gr_gid;
|
|
else {
|
|
value = strtoul(spec2, &endp, 10);
|
|
if (*endp != '\0') {
|
|
len = snprintf(errstr, buflen,
|
|
"invalid gid: '%s'", spec2);
|
|
return (-1);
|
|
}
|
|
gid2 = value;
|
|
}
|
|
|
|
*min = gid1;
|
|
*max = gid2;
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
bsde_parse_subject(int argc, char *argv[],
|
|
struct mac_bsdextended_subject *subject, size_t buflen, char *errstr)
|
|
{
|
|
int not_seen, flags;
|
|
int current, neg, nextnot;
|
|
char *endp;
|
|
uid_t uid_min, uid_max;
|
|
gid_t gid_min, gid_max;
|
|
int jid = 0;
|
|
size_t len;
|
|
long value;
|
|
|
|
current = 0;
|
|
flags = 0;
|
|
neg = 0;
|
|
nextnot = 0;
|
|
|
|
if (strcmp("not", argv[current]) == 0) {
|
|
not_seen = 1;
|
|
current++;
|
|
} else
|
|
not_seen = 0;
|
|
|
|
while (current < argc) {
|
|
if (strcmp(argv[current], "uid") == 0) {
|
|
if (current + 2 > argc) {
|
|
len = snprintf(errstr, buflen, "uid short");
|
|
return (-1);
|
|
}
|
|
if (flags & MBS_UID_DEFINED) {
|
|
len = snprintf(errstr, buflen, "one uid only");
|
|
return (-1);
|
|
}
|
|
if (bsde_parse_uidrange(argv[current+1],
|
|
&uid_min, &uid_max, buflen, errstr) < 0)
|
|
return (-1);
|
|
flags |= MBS_UID_DEFINED;
|
|
if (nextnot) {
|
|
neg ^= MBS_UID_DEFINED;
|
|
nextnot = 0;
|
|
}
|
|
current += 2;
|
|
} else if (strcmp(argv[current], "gid") == 0) {
|
|
if (current + 2 > argc) {
|
|
len = snprintf(errstr, buflen, "gid short");
|
|
return (-1);
|
|
}
|
|
if (flags & MBS_GID_DEFINED) {
|
|
len = snprintf(errstr, buflen, "one gid only");
|
|
return (-1);
|
|
}
|
|
if (bsde_parse_gidrange(argv[current+1],
|
|
&gid_min, &gid_max, buflen, errstr) < 0)
|
|
return (-1);
|
|
flags |= MBS_GID_DEFINED;
|
|
if (nextnot) {
|
|
neg ^= MBS_GID_DEFINED;
|
|
nextnot = 0;
|
|
}
|
|
current += 2;
|
|
} else if (strcmp(argv[current], "jailid") == 0) {
|
|
if (current + 2 > argc) {
|
|
len = snprintf(errstr, buflen, "prison short");
|
|
return (-1);
|
|
}
|
|
if (flags & MBS_PRISON_DEFINED) {
|
|
len = snprintf(errstr, buflen, "one jail only");
|
|
return (-1);
|
|
}
|
|
value = strtol(argv[current+1], &endp, 10);
|
|
if (*endp != '\0') {
|
|
len = snprintf(errstr, buflen,
|
|
"invalid jid: '%s'", argv[current+1]);
|
|
return (-1);
|
|
}
|
|
jid = value;
|
|
flags |= MBS_PRISON_DEFINED;
|
|
if (nextnot) {
|
|
neg ^= MBS_PRISON_DEFINED;
|
|
nextnot = 0;
|
|
}
|
|
current += 2;
|
|
} else if (strcmp(argv[current], "!") == 0) {
|
|
if (nextnot) {
|
|
len = snprintf(errstr, buflen,
|
|
"double negative");
|
|
return (-1);
|
|
}
|
|
nextnot = 1;
|
|
current += 1;
|
|
} else {
|
|
len = snprintf(errstr, buflen, "'%s' not expected",
|
|
argv[current]);
|
|
return (-1);
|
|
}
|
|
}
|
|
|
|
subject->mbs_flags = flags;
|
|
if (not_seen)
|
|
subject->mbs_neg = MBS_ALL_FLAGS ^ neg;
|
|
else
|
|
subject->mbs_neg = neg;
|
|
if (flags & MBS_UID_DEFINED) {
|
|
subject->mbs_uid_min = uid_min;
|
|
subject->mbs_uid_max = uid_max;
|
|
}
|
|
if (flags & MBS_GID_DEFINED) {
|
|
subject->mbs_gid_min = gid_min;
|
|
subject->mbs_gid_max = gid_max;
|
|
}
|
|
if (flags & MBS_PRISON_DEFINED)
|
|
subject->mbs_prison = jid;
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
bsde_parse_type(char *spec, int *type, size_t buflen, char *errstr)
|
|
{
|
|
size_t len;
|
|
int i;
|
|
|
|
*type = 0;
|
|
for (i = 0; i < strlen(spec); i++) {
|
|
switch (spec[i]) {
|
|
case 'r':
|
|
case '-':
|
|
*type |= MBO_TYPE_REG;
|
|
break;
|
|
case 'd':
|
|
*type |= MBO_TYPE_DIR;
|
|
break;
|
|
case 'b':
|
|
*type |= MBO_TYPE_BLK;
|
|
break;
|
|
case 'c':
|
|
*type |= MBO_TYPE_CHR;
|
|
break;
|
|
case 'l':
|
|
*type |= MBO_TYPE_LNK;
|
|
break;
|
|
case 's':
|
|
*type |= MBO_TYPE_SOCK;
|
|
break;
|
|
case 'p':
|
|
*type |= MBO_TYPE_FIFO;
|
|
break;
|
|
case 'a':
|
|
*type |= MBO_ALL_TYPE;
|
|
break;
|
|
default:
|
|
len = snprintf(errstr, buflen, "Unknown type code: %c",
|
|
spec[i]);
|
|
return (-1);
|
|
}
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
bsde_parse_fsid(char *spec, struct fsid *fsid, size_t buflen, char *errstr)
|
|
{
|
|
size_t len;
|
|
struct statfs buf;
|
|
|
|
if (statfs(spec, &buf) < 0) {
|
|
len = snprintf(errstr, buflen, "Unable to get id for %s: %s",
|
|
spec, strerror(errno));
|
|
return (-1);
|
|
}
|
|
|
|
*fsid = buf.f_fsid;
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
bsde_parse_object(int argc, char *argv[],
|
|
struct mac_bsdextended_object *object, size_t buflen, char *errstr)
|
|
{
|
|
int not_seen, flags;
|
|
int current, neg, nextnot;
|
|
int type;
|
|
uid_t uid_min, uid_max;
|
|
gid_t gid_min, gid_max;
|
|
struct fsid fsid;
|
|
size_t len;
|
|
|
|
current = 0;
|
|
flags = 0;
|
|
neg = 0;
|
|
nextnot = 0;
|
|
type = 0;
|
|
|
|
if (strcmp("not", argv[current]) == 0) {
|
|
not_seen = 1;
|
|
current++;
|
|
} else
|
|
not_seen = 0;
|
|
|
|
while (current < argc) {
|
|
if (strcmp(argv[current], "uid") == 0) {
|
|
if (current + 2 > argc) {
|
|
len = snprintf(errstr, buflen, "uid short");
|
|
return (-1);
|
|
}
|
|
if (flags & MBO_UID_DEFINED) {
|
|
len = snprintf(errstr, buflen, "one uid only");
|
|
return (-1);
|
|
}
|
|
if (bsde_parse_uidrange(argv[current+1],
|
|
&uid_min, &uid_max, buflen, errstr) < 0)
|
|
return (-1);
|
|
flags |= MBO_UID_DEFINED;
|
|
if (nextnot) {
|
|
neg ^= MBO_UID_DEFINED;
|
|
nextnot = 0;
|
|
}
|
|
current += 2;
|
|
} else if (strcmp(argv[current], "gid") == 0) {
|
|
if (current + 2 > argc) {
|
|
len = snprintf(errstr, buflen, "gid short");
|
|
return (-1);
|
|
}
|
|
if (flags & MBO_GID_DEFINED) {
|
|
len = snprintf(errstr, buflen, "one gid only");
|
|
return (-1);
|
|
}
|
|
if (bsde_parse_gidrange(argv[current+1],
|
|
&gid_min, &gid_max, buflen, errstr) < 0)
|
|
return (-1);
|
|
flags |= MBO_GID_DEFINED;
|
|
if (nextnot) {
|
|
neg ^= MBO_GID_DEFINED;
|
|
nextnot = 0;
|
|
}
|
|
current += 2;
|
|
} else if (strcmp(argv[current], "filesys") == 0) {
|
|
if (current + 2 > argc) {
|
|
len = snprintf(errstr, buflen, "filesys short");
|
|
return (-1);
|
|
}
|
|
if (flags & MBO_FSID_DEFINED) {
|
|
len = snprintf(errstr, buflen, "one fsid only");
|
|
return (-1);
|
|
}
|
|
if (bsde_parse_fsid(argv[current+1], &fsid,
|
|
buflen, errstr) < 0)
|
|
return (-1);
|
|
flags |= MBO_FSID_DEFINED;
|
|
if (nextnot) {
|
|
neg ^= MBO_FSID_DEFINED;
|
|
nextnot = 0;
|
|
}
|
|
current += 2;
|
|
} else if (strcmp(argv[current], "suid") == 0) {
|
|
flags |= MBO_SUID;
|
|
if (nextnot) {
|
|
neg ^= MBO_SUID;
|
|
nextnot = 0;
|
|
}
|
|
current += 1;
|
|
} else if (strcmp(argv[current], "sgid") == 0) {
|
|
flags |= MBO_SGID;
|
|
if (nextnot) {
|
|
neg ^= MBO_SGID;
|
|
nextnot = 0;
|
|
}
|
|
current += 1;
|
|
} else if (strcmp(argv[current], "uid_of_subject") == 0) {
|
|
flags |= MBO_UID_SUBJECT;
|
|
if (nextnot) {
|
|
neg ^= MBO_UID_SUBJECT;
|
|
nextnot = 0;
|
|
}
|
|
current += 1;
|
|
} else if (strcmp(argv[current], "gid_of_subject") == 0) {
|
|
flags |= MBO_GID_SUBJECT;
|
|
if (nextnot) {
|
|
neg ^= MBO_GID_SUBJECT;
|
|
nextnot = 0;
|
|
}
|
|
current += 1;
|
|
} else if (strcmp(argv[current], "type") == 0) {
|
|
if (current + 2 > argc) {
|
|
len = snprintf(errstr, buflen, "type short");
|
|
return (-1);
|
|
}
|
|
if (flags & MBO_TYPE_DEFINED) {
|
|
len = snprintf(errstr, buflen, "one type only");
|
|
return (-1);
|
|
}
|
|
if (bsde_parse_type(argv[current+1], &type,
|
|
buflen, errstr) < 0)
|
|
return (-1);
|
|
flags |= MBO_TYPE_DEFINED;
|
|
if (nextnot) {
|
|
neg ^= MBO_TYPE_DEFINED;
|
|
nextnot = 0;
|
|
}
|
|
current += 2;
|
|
} else if (strcmp(argv[current], "!") == 0) {
|
|
if (nextnot) {
|
|
len = snprintf(errstr, buflen,
|
|
"double negative'");
|
|
return (-1);
|
|
}
|
|
nextnot = 1;
|
|
current += 1;
|
|
} else {
|
|
len = snprintf(errstr, buflen, "'%s' not expected",
|
|
argv[current]);
|
|
return (-1);
|
|
}
|
|
}
|
|
|
|
object->mbo_flags = flags;
|
|
if (not_seen)
|
|
object->mbo_neg = MBO_ALL_FLAGS ^ neg;
|
|
else
|
|
object->mbo_neg = neg;
|
|
if (flags & MBO_UID_DEFINED) {
|
|
object->mbo_uid_min = uid_min;
|
|
object->mbo_uid_max = uid_max;
|
|
}
|
|
if (flags & MBO_GID_DEFINED) {
|
|
object->mbo_gid_min = gid_min;
|
|
object->mbo_gid_max = gid_max;
|
|
}
|
|
if (flags & MBO_FSID_DEFINED)
|
|
object->mbo_fsid = fsid;
|
|
if (flags & MBO_TYPE_DEFINED)
|
|
object->mbo_type = type;
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
bsde_parse_mode(int argc, char *argv[], mode_t *mode, size_t buflen,
|
|
char *errstr)
|
|
{
|
|
size_t len;
|
|
int i;
|
|
|
|
if (argc == 0) {
|
|
len = snprintf(errstr, buflen, "mode expects mode value");
|
|
return (-1);
|
|
}
|
|
|
|
if (argc != 1) {
|
|
len = snprintf(errstr, buflen, "'%s' unexpected", argv[1]);
|
|
return (-1);
|
|
}
|
|
|
|
*mode = 0;
|
|
for (i = 0; i < strlen(argv[0]); i++) {
|
|
switch (argv[0][i]) {
|
|
case 'a':
|
|
*mode |= MBI_ADMIN;
|
|
break;
|
|
case 'r':
|
|
*mode |= MBI_READ;
|
|
break;
|
|
case 's':
|
|
*mode |= MBI_STAT;
|
|
break;
|
|
case 'w':
|
|
*mode |= MBI_WRITE;
|
|
break;
|
|
case 'x':
|
|
*mode |= MBI_EXEC;
|
|
break;
|
|
case 'n':
|
|
/* ignore */
|
|
break;
|
|
default:
|
|
len = snprintf(errstr, buflen, "Unknown mode letter: %c",
|
|
argv[0][i]);
|
|
return (-1);
|
|
}
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
bsde_parse_rule(int argc, char *argv[], struct mac_bsdextended_rule *rule,
|
|
size_t buflen, char *errstr)
|
|
{
|
|
int subject, subject_elements, subject_elements_length;
|
|
int object, object_elements, object_elements_length;
|
|
int mode, mode_elements, mode_elements_length;
|
|
int error, i;
|
|
size_t len;
|
|
|
|
bzero(rule, sizeof(*rule));
|
|
|
|
if (argc < 1) {
|
|
len = snprintf(errstr, buflen, "Rule must begin with subject");
|
|
return (-1);
|
|
}
|
|
|
|
if (strcmp(argv[0], "subject") != 0) {
|
|
len = snprintf(errstr, buflen, "Rule must begin with subject");
|
|
return (-1);
|
|
}
|
|
subject = 0;
|
|
subject_elements = 1;
|
|
|
|
/* Search forward for object. */
|
|
|
|
object = -1;
|
|
for (i = 1; i < argc; i++)
|
|
if (strcmp(argv[i], "object") == 0)
|
|
object = i;
|
|
|
|
if (object == -1) {
|
|
len = snprintf(errstr, buflen, "Rule must contain an object");
|
|
return (-1);
|
|
}
|
|
|
|
/* Search forward for mode. */
|
|
mode = -1;
|
|
for (i = object; i < argc; i++)
|
|
if (strcmp(argv[i], "mode") == 0)
|
|
mode = i;
|
|
|
|
if (mode == -1) {
|
|
len = snprintf(errstr, buflen, "Rule must contain mode");
|
|
return (-1);
|
|
}
|
|
|
|
subject_elements_length = object - subject - 1;
|
|
object_elements = object + 1;
|
|
object_elements_length = mode - object_elements;
|
|
mode_elements = mode + 1;
|
|
mode_elements_length = argc - mode_elements;
|
|
|
|
error = bsde_parse_subject(subject_elements_length,
|
|
argv + subject_elements, &rule->mbr_subject, buflen, errstr);
|
|
if (error)
|
|
return (-1);
|
|
|
|
error = bsde_parse_object(object_elements_length,
|
|
argv + object_elements, &rule->mbr_object, buflen, errstr);
|
|
if (error)
|
|
return (-1);
|
|
|
|
error = bsde_parse_mode(mode_elements_length, argv + mode_elements,
|
|
&rule->mbr_mode, buflen, errstr);
|
|
if (error)
|
|
return (-1);
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
bsde_parse_rule_string(const char *string, struct mac_bsdextended_rule *rule,
|
|
size_t buflen, char *errstr)
|
|
{
|
|
char *stringdup, *stringp, *argv[100], **ap;
|
|
int argc, error;
|
|
|
|
stringp = stringdup = strdup(string);
|
|
while (*stringp == ' ' || *stringp == '\t')
|
|
stringp++;
|
|
|
|
argc = 0;
|
|
for (ap = argv; (*ap = strsep(&stringp, " \t")) != NULL;) {
|
|
argc++;
|
|
if (**ap != '\0')
|
|
if (++ap >= &argv[100])
|
|
break;
|
|
}
|
|
|
|
error = bsde_parse_rule(argc, argv, rule, buflen, errstr);
|
|
|
|
free(stringdup);
|
|
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
bsde_get_mib(const char *string, int *name, size_t *namelen)
|
|
{
|
|
size_t len;
|
|
int error;
|
|
|
|
len = *namelen;
|
|
error = sysctlnametomib(string, name, &len);
|
|
if (error)
|
|
return (error);
|
|
|
|
*namelen = len;
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
bsde_check_version(size_t buflen, char *errstr)
|
|
{
|
|
size_t len;
|
|
int error;
|
|
int version;
|
|
|
|
len = sizeof(version);
|
|
error = sysctlbyname(MIB ".rule_version", &version, &len, NULL, 0);
|
|
if (error) {
|
|
len = snprintf(errstr, buflen, "version check failed: %s",
|
|
strerror(errno));
|
|
return (-1);
|
|
}
|
|
if (version != MB_VERSION) {
|
|
len = snprintf(errstr, buflen, "module v%d != library v%d",
|
|
version, MB_VERSION);
|
|
return (-1);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
bsde_get_rule_count(size_t buflen, char *errstr)
|
|
{
|
|
size_t len;
|
|
int error;
|
|
int rule_count;
|
|
|
|
len = sizeof(rule_count);
|
|
error = sysctlbyname(MIB ".rule_count", &rule_count, &len, NULL, 0);
|
|
if (error) {
|
|
len = snprintf(errstr, buflen, "%s", strerror(errno));
|
|
return (-1);
|
|
}
|
|
if (len != sizeof(rule_count)) {
|
|
len = snprintf(errstr, buflen, "Data error in %s.rule_count",
|
|
MIB);
|
|
return (-1);
|
|
}
|
|
|
|
return (rule_count);
|
|
}
|
|
|
|
int
|
|
bsde_get_rule_slots(size_t buflen, char *errstr)
|
|
{
|
|
size_t len;
|
|
int error;
|
|
int rule_slots;
|
|
|
|
len = sizeof(rule_slots);
|
|
error = sysctlbyname(MIB ".rule_slots", &rule_slots, &len, NULL, 0);
|
|
if (error) {
|
|
len = snprintf(errstr, buflen, "%s", strerror(errno));
|
|
return (-1);
|
|
}
|
|
if (len != sizeof(rule_slots)) {
|
|
len = snprintf(errstr, buflen, "Data error in %s.rule_slots",
|
|
MIB);
|
|
return (-1);
|
|
}
|
|
|
|
return (rule_slots);
|
|
}
|
|
|
|
/*
|
|
* Returns 0 for success;
|
|
* Returns -1 for failure;
|
|
* Returns -2 for not present
|
|
*/
|
|
int
|
|
bsde_get_rule(int rulenum, struct mac_bsdextended_rule *rule, size_t errlen,
|
|
char *errstr)
|
|
{
|
|
int name[10];
|
|
size_t len, size;
|
|
int error;
|
|
|
|
if (bsde_check_version(errlen, errstr) != 0)
|
|
return (-1);
|
|
|
|
len = 10;
|
|
error = bsde_get_mib(MIB ".rules", name, &len);
|
|
if (error) {
|
|
len = snprintf(errstr, errlen, "%s: %s", MIB ".rules",
|
|
strerror(errno));
|
|
return (-1);
|
|
}
|
|
|
|
size = sizeof(*rule);
|
|
name[len] = rulenum;
|
|
len++;
|
|
error = sysctl(name, len, rule, &size, NULL, 0);
|
|
if (error == -1 && errno == ENOENT)
|
|
return (-2);
|
|
if (error) {
|
|
len = snprintf(errstr, errlen, "%s.%d: %s", MIB ".rules",
|
|
rulenum, strerror(errno));
|
|
return (-1);
|
|
} else if (size != sizeof(*rule)) {
|
|
len = snprintf(errstr, errlen, "Data error in %s.%d: %s",
|
|
MIB ".rules", rulenum, strerror(errno));
|
|
return (-1);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
bsde_delete_rule(int rulenum, size_t buflen, char *errstr)
|
|
{
|
|
struct mac_bsdextended_rule rule;
|
|
int name[10];
|
|
size_t len;
|
|
int error;
|
|
|
|
if (bsde_check_version(buflen, errstr) != 0)
|
|
return (-1);
|
|
|
|
len = 10;
|
|
error = bsde_get_mib(MIB ".rules", name, &len);
|
|
if (error) {
|
|
len = snprintf(errstr, buflen, "%s: %s", MIB ".rules",
|
|
strerror(errno));
|
|
return (-1);
|
|
}
|
|
|
|
name[len] = rulenum;
|
|
len++;
|
|
|
|
error = sysctl(name, len, NULL, NULL, &rule, 0);
|
|
if (error) {
|
|
len = snprintf(errstr, buflen, "%s.%d: %s", MIB ".rules",
|
|
rulenum, strerror(errno));
|
|
return (-1);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
bsde_set_rule(int rulenum, struct mac_bsdextended_rule *rule, size_t buflen,
|
|
char *errstr)
|
|
{
|
|
int name[10];
|
|
size_t len;
|
|
int error;
|
|
|
|
if (bsde_check_version(buflen, errstr) != 0)
|
|
return (-1);
|
|
|
|
len = 10;
|
|
error = bsde_get_mib(MIB ".rules", name, &len);
|
|
if (error) {
|
|
len = snprintf(errstr, buflen, "%s: %s", MIB ".rules",
|
|
strerror(errno));
|
|
return (-1);
|
|
}
|
|
|
|
name[len] = rulenum;
|
|
len++;
|
|
|
|
error = sysctl(name, len, NULL, NULL, rule, sizeof(*rule));
|
|
if (error) {
|
|
len = snprintf(errstr, buflen, "%s.%d: %s", MIB ".rules",
|
|
rulenum, strerror(errno));
|
|
return (-1);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
bsde_add_rule(int *rulenum, struct mac_bsdextended_rule *rule, size_t buflen,
|
|
char *errstr)
|
|
{
|
|
char charstr[BUFSIZ];
|
|
int name[10];
|
|
size_t len;
|
|
int error, rule_slots;
|
|
|
|
if (bsde_check_version(buflen, errstr) != 0)
|
|
return (-1);
|
|
|
|
len = 10;
|
|
error = bsde_get_mib(MIB ".rules", name, &len);
|
|
if (error) {
|
|
len = snprintf(errstr, buflen, "%s: %s", MIB ".rules",
|
|
strerror(errno));
|
|
return (-1);
|
|
}
|
|
|
|
rule_slots = bsde_get_rule_slots(BUFSIZ, charstr);
|
|
if (rule_slots == -1) {
|
|
len = snprintf(errstr, buflen, "unable to get rule slots: %s",
|
|
strerror(errno));
|
|
return (-1);
|
|
}
|
|
|
|
name[len] = rule_slots;
|
|
len++;
|
|
|
|
error = sysctl(name, len, NULL, NULL, rule, sizeof(*rule));
|
|
if (error) {
|
|
len = snprintf(errstr, buflen, "%s.%d: %s", MIB ".rules",
|
|
rule_slots, strerror(errno));
|
|
return (-1);
|
|
}
|
|
|
|
if (rulenum != NULL)
|
|
*rulenum = rule_slots;
|
|
|
|
return (0);
|
|
}
|