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1554ba03b6
This module allows controlled privilege escallation via mac labels securely associated with a process via mac_veriexec. There are over 700 PRIV_* but we can compress many of them into a single GBL_* thus constraining the size of gbl labels. The goal is to allow a daemon to run as an unprivileged process while still being able a set of privileged operations needed. We add APIs to libveriexec so that userland processes can check labels and an exec_script API that allows a suitably labeled process to run something like a python interpreter directly if necessary; overcomming the 'indirect' flag applied to the interpreter. Add -l option to sbin/veriexec to report labels. Reviewed by: stevek Sponsored by: Juniper Networks, Inc. Differential Revision: https://reviews.freebsd.org/D41431
126 lines
2.9 KiB
C
126 lines
2.9 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2019-2023, Juniper Networks, Inc.
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* All rights reserved.
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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 ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* 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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*/
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#include <sys/types.h>
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#include <sys/errno.h>
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#include <sys/mac.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <security/mac_grantbylabel/mac_grantbylabel.h>
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/**
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* @brief does path have a gbl label
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*
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* @return
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* @li 0 if no/empty label or module not loaded
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* @li value of label
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*/
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unsigned int
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gbl_check_path(const char *path)
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{
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struct mac_grantbylabel_fetch_gbl_args gbl;
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int fd;
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int rc;
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rc = 0;
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if ((fd = open(path, O_RDONLY|O_VERIFY)) >= 0) {
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gbl.u.fd = fd;
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if (mac_syscall(MAC_GRANTBYLABEL_NAME,
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MAC_GRANTBYLABEL_FETCH_GBL,
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&gbl) == 0) {
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if (gbl.gbl != GBL_EMPTY)
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rc = gbl.gbl;
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}
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close(fd);
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}
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return(rc);
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}
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/**
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* @brief does pid have a gbl label
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*
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* @return
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* @li 0 if no/empty label or module not loaded
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* @li value of label
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*/
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unsigned int
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gbl_check_pid(pid_t pid)
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{
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struct mac_grantbylabel_fetch_gbl_args gbl;
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int rc;
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rc = 0;
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gbl.u.pid = pid;
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if (mac_syscall(MAC_GRANTBYLABEL_NAME,
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MAC_GRANTBYLABEL_FETCH_PID_GBL, &gbl) == 0) {
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if (gbl.gbl != GBL_EMPTY)
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rc = gbl.gbl;
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}
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return(rc);
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}
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#ifdef UNIT_TEST
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#include <stdlib.h>
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#include <stdio.h>
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#include <err.h>
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int
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main(int argc, char *argv[])
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{
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pid_t pid;
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int pflag = 0;
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int c;
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unsigned int gbl;
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while ((c = getopt(argc, argv, "p")) != -1) {
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switch (c) {
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case 'p':
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pflag = 1;
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break;
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default:
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break;
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}
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}
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for (; optind < argc; optind++) {
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if (pflag) {
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pid = atoi(argv[optind]);
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gbl = gbl_check_pid(pid);
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} else {
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gbl = gbl_check_path(argv[optind]);
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}
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printf("arg=%s, gbl=%#o\n", argv[optind], gbl);
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}
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return 0;
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}
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#endif
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