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711 lines
16 KiB
C
711 lines
16 KiB
C
/*-
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* Copyright (c) 2002 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/vnode.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 subjectand object elements, mode.
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* Each element takes the form "[not] [uid number] [gid number]".
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* The total form is "subject [element] object [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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char *cur;
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size_t left, len;
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int anymode, unknownmode, truncated;
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cur = buf;
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left = buflen;
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truncated = 0;
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if (rule->mbr_subject.mbi_flags & (MBI_UID_DEFINED |
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MBI_GID_DEFINED)) {
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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.mbi_flags & MBI_NEGATED) {
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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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}
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if (rule->mbr_subject.mbi_flags & MBI_UID_DEFINED) {
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pwd = getpwuid(rule->mbr_subject.mbi_uid);
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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.mbi_uid);
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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 (rule->mbr_subject.mbi_flags & MBI_GID_DEFINED) {
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grp = getgrgid(rule->mbr_subject.mbi_gid);
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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.mbi_gid);
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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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}
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if (rule->mbr_object.mbi_flags & (MBI_UID_DEFINED |
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MBI_GID_DEFINED)) {
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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.mbi_flags & MBI_NEGATED) {
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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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}
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if (rule->mbr_object.mbi_flags & MBI_UID_DEFINED) {
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pwd = getpwuid(rule->mbr_object.mbi_uid);
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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.mbi_uid);
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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 (rule->mbr_object.mbi_flags & MBI_GID_DEFINED) {
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grp = getgrgid(rule->mbr_object.mbi_gid);
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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.mbi_gid);
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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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}
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len = snprintf(cur, left, "mode ");
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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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anymode = (rule->mbr_mode & VALLPERM);
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unknownmode = (rule->mbr_mode & ~VALLPERM);
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if (rule->mbr_mode & VADMIN) {
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len = snprintf(cur, left, "a");
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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_mode & VREAD) {
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len = snprintf(cur, left, "r");
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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_mode & VSTAT) {
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len = snprintf(cur, left, "s");
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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_mode & VWRITE) {
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len = snprintf(cur, left, "w");
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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_mode & VEXEC) {
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len = snprintf(cur, left, "x");
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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 (!anymode) {
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len = snprintf(cur, left, "n");
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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 (unknownmode) {
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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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return (0);
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truncated:
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return (-1);
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}
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int
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bsde_parse_identity(int argc, char *argv[],
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struct mac_bsdextended_identity *identity, size_t buflen, char *errstr)
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{
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struct group *grp;
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struct passwd *pwd;
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int uid_seen, gid_seen, not_seen;
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int current;
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char *endp;
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long value;
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uid_t uid;
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gid_t gid;
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size_t len;
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if (argc == 0) {
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len = snprintf(errstr, buflen, "Identity must not be empty");
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return (-1);
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}
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current = 0;
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/* First element might be "not". */
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if (strcmp("not", argv[0]) == 0) {
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not_seen = 1;
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current++;
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} else
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not_seen = 0;
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if (current >= argc) {
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len = snprintf(errstr, buflen, "Identity short");
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return (-1);
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}
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uid_seen = 0;
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uid = 0;
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gid_seen = 0;
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gid = 0;
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/* First phrase: uid [uid] or gid[gid]. */
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if (strcmp("uid", argv[current]) == 0) {
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if (current + 2 > argc) {
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len = snprintf(errstr, buflen, "uid short");
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return (-1);
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}
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pwd = getpwnam(argv[current+1]);
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if (pwd != NULL)
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uid = pwd->pw_uid;
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else {
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value = strtol(argv[current+1], &endp, 10);
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if (*endp != '\0') {
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len = snprintf(errstr, buflen,
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"invalid uid: '%s'",
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argv[current+1]);
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return (-1);
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}
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uid = value;
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}
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uid_seen = 1;
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current += 2;
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} else if (strcmp("gid", argv[current]) == 0) {
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if (current + 2 > argc) {
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len = snprintf(errstr, buflen, "gid short");
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return (-1);
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}
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grp = getgrnam(argv[current+1]);
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if (grp != NULL)
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gid = grp->gr_gid;
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else {
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value = strtol(argv[current+1], &endp, 10);
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if (*endp != '\0') {
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len = snprintf(errstr, buflen,
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"invalid gid: '%s'",
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argv[current+1]);
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return (-1);
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}
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gid = value;
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}
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gid_seen = 1;
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current += 2;
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} else {
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len = snprintf(errstr, buflen, "'%s' not expected",
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argv[current]);
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return (-1);
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}
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/* Onto optional second phrase. */
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if (current + 1 < argc) {
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/* Second phrase: uid [uid] or gid [gid], but not a repeat. */
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if (strcmp("uid", argv[current]) == 0) {
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if (uid_seen) {
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len = snprintf(errstr, buflen,
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"Only one uid permitted per identity clause");
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return (-1);
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}
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if (current + 2 > argc) {
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len = snprintf(errstr, buflen, "uid short");
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return (-1);
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}
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value = strtol(argv[current+1], &endp, 10);
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if (*endp != '\0') {
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len = snprintf(errstr, buflen, "invalid uid: '%s'",
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argv[current+1]);
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return (-1);
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}
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uid = value;
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uid_seen = 1;
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current += 2;
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} else if (strcmp("gid", argv[current]) == 0) {
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if (gid_seen) {
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len = snprintf(errstr, buflen,
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"Only one gid permitted per identity clause");
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return (-1);
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}
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if (current + 2 > argc) {
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len = snprintf(errstr, buflen, "gid short");
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return (-1);
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}
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value = strtol(argv[current+1], &endp, 10);
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if (*endp != '\0') {
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len = snprintf(errstr, buflen, "invalid gid: '%s'",
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argv[current+1]);
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return (-1);
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}
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gid = value;
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gid_seen = 1;
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current += 2;
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} else {
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len = snprintf(errstr, buflen, "'%s' not expected",
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argv[current]);
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return (-1);
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}
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}
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if (current +1 < argc) {
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len = snprintf(errstr, buflen, "'%s' not expected",
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argv[current]);
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return (-1);
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}
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/* Fill out the identity. */
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identity->mbi_flags = 0;
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if (not_seen)
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identity->mbi_flags |= MBI_NEGATED;
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if (uid_seen) {
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identity->mbi_flags |= MBI_UID_DEFINED;
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identity->mbi_uid = uid;
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} else
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identity->mbi_uid = 0;
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if (gid_seen) {
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identity->mbi_flags |= MBI_GID_DEFINED;
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identity->mbi_gid = gid;
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} else
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identity->mbi_gid = 0;
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return (0);
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}
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int
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bsde_parse_mode(int argc, char *argv[], mode_t *mode, size_t buflen,
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char *errstr)
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{
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size_t len;
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int i;
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if (argc == 0) {
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len = snprintf(errstr, buflen, "mode expects mode value");
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return (-1);
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}
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if (argc != 1) {
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len = snprintf(errstr, buflen, "'%s' unexpected", argv[1]);
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return (-1);
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}
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*mode = 0;
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for (i = 0; i < strlen(argv[0]); i++) {
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switch (argv[0][i]) {
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case 'a':
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*mode |= VADMIN;
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break;
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case 'r':
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*mode |= VREAD;
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break;
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case 's':
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*mode |= VSTAT;
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break;
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case 'w':
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*mode |= VWRITE;
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break;
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case 'x':
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*mode |= VEXEC;
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break;
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case 'n':
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/* ignore */
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break;
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default:
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len = snprintf(errstr, buflen, "Unknown mode letter: %c",
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argv[0][i]);
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return (-1);
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}
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}
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return (0);
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}
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int
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bsde_parse_rule(int argc, char *argv[], struct mac_bsdextended_rule *rule,
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size_t buflen, char *errstr)
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{
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int subject, subject_elements, subject_elements_length;
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int object, object_elements, object_elements_length;
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int mode, mode_elements, mode_elements_length;
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int error, i;
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size_t len;
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bzero(rule, sizeof(*rule));
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if (argc < 1) {
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len = snprintf(errstr, buflen, "Rule must begin with subject");
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return (-1);
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}
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if (strcmp(argv[0], "subject") != 0) {
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len = snprintf(errstr, buflen, "Rule must begin with subject");
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return (-1);
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}
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subject = 0;
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subject_elements = 1;
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/* Search forward for object. */
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object = -1;
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for (i = 1; i < argc; i++)
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if (strcmp(argv[i], "object") == 0)
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object = i;
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if (object == -1) {
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len = snprintf(errstr, buflen, "Rule must contain an object");
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return (-1);
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}
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/* Search forward for mode. */
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mode = -1;
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for (i = object; i < argc; i++)
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if (strcmp(argv[i], "mode") == 0)
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mode = i;
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if (mode == -1) {
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len = snprintf(errstr, buflen, "Rule must contain mode");
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return (-1);
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}
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subject_elements_length = object - subject - 1;
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object_elements = object + 1;
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object_elements_length = mode - object_elements;
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mode_elements = mode + 1;
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mode_elements_length = argc - mode_elements;
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error = bsde_parse_identity(subject_elements_length,
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argv + subject_elements, &rule->mbr_subject, buflen, errstr);
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if (error)
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return (-1);
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error = bsde_parse_identity(object_elements_length,
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argv + object_elements, &rule->mbr_object, buflen, errstr);
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if (error)
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return (-1);
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error = bsde_parse_mode(mode_elements_length, argv + mode_elements,
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&rule->mbr_mode, buflen, errstr);
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if (error)
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return (-1);
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return (0);
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}
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int
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bsde_parse_rule_string(const char *string, struct mac_bsdextended_rule *rule,
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size_t buflen, char *errstr)
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{
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char *stringdup, *stringp, *argv[20], **ap;
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int argc, error;
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stringp = stringdup = strdup(string);
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while (*stringp == ' ' || *stringp == '\t')
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stringp++;
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argc = 0;
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for (ap = argv; (*ap = strsep(&stringp, " \t")) != NULL;) {
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argc++;
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if (**ap != '\0')
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if (++ap >= &argv[20])
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break;
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}
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error = bsde_parse_rule(argc, argv, rule, buflen, errstr);
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|
|
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);
|
|
}
|
|
|
|
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, NULL);
|
|
if (error) {
|
|
len = snprintf(errstr, buflen, 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,
|
|
NULL);
|
|
if (error) {
|
|
len = snprintf(errstr, buflen, 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;
|
|
|
|
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, size;
|
|
int error;
|
|
|
|
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++;
|
|
|
|
size = sizeof(rule);
|
|
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, size;
|
|
int error;
|
|
|
|
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++;
|
|
|
|
size = sizeof(*rule);
|
|
error = sysctl(name, len, NULL, NULL, rule, size);
|
|
if (error) {
|
|
len = snprintf(errstr, buflen, "%s.%d: %s", MIB ".rules",
|
|
rulenum, strerror(errno));
|
|
return (-1);
|
|
}
|
|
|
|
return (0);
|
|
}
|