9fa5f6b4b9
implemented properly for a number of kernel subsystems. In general, they try to exercise the privilege first as the root user, then as a test user, in order to determine when privilege is being checked. Currently, these tests do not compare inside/outside jail, and probably should be enhanced to do that. Sponsored by: nCircle Network Security, Inc. Obtained from: TrustedBSD Project
235 lines
6.2 KiB
C
235 lines
6.2 KiB
C
/*-
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* Copyright (c) 2006 nCircle Network Security, Inc.
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* All rights reserved.
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*
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* This software was developed by Robert N. M. Watson for the TrustedBSD
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* Project under contract to nCircle Network Security, Inc.
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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, NCIRCLE NETWORK SECURITY,
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* INC., OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* Test privilege associated with real time process settings. There are
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* three relevant notions of privilege:
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*
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* - Privilege to set the real-time priority of the current process.
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* - Privilege to set the real-time priority of another process.
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* - Privilege to set the idle priority of another process.
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* - No privilege to set the idle priority of the current process.
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*
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* This requires a test process and a target (dummy) process running with
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* various uids. This test is based on the code in the setpriority() test.
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*/
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#include <sys/types.h>
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#include <sys/rtprio.h>
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#include <sys/wait.h>
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#include <err.h>
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#include <errno.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "main.h"
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static void
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dummy(void)
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{
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while (1)
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sleep(1);
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}
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static void
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collect(pid_t test_pid, pid_t dummy_pid)
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{
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pid_t pid;
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/*
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* First, collect the main test process. When it has exited, then
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* kill off the dummy process.
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*/
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if (test_pid > 0) {
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while (1) {
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pid = waitpid(test_pid, NULL, 0);
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if (pid == -1)
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warn("waitpid(%d (test), NULL, 0)", test_pid);
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if (pid == test_pid)
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break;
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}
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}
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if (kill(dummy_pid, SIGKILL) < 0)
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err(-1, "kill(%d, SIGKILL)", dummy_pid);
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while (1) {
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pid = waitpid(dummy_pid, NULL, 0);
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if (pid == -1)
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warn("waitpid(%d, NULL, 0)", dummy_pid);
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if (pid == dummy_pid)
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return;
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}
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}
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static void
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test(pid_t dummy_pid)
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{
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struct rtprio rtp;
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int error;
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/*
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* Tests first as root. Test that we can set normal, realtime, and
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* idle priorities on the current thread and on the dummy thread.
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*/
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rtp.type = RTP_PRIO_REALTIME;
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rtp.prio = 0;
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if (rtprio(RTP_SET, 0, &rtp) < 0)
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err(-1, "rtprio(RTP_SET, 0, {REALTIME, 0}) as root");
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rtp.type = RTP_PRIO_IDLE;
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rtp.prio = 0;
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if (rtprio(RTP_SET, 0, &rtp) < 0)
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err(-1, "rtprio(RTP_SET, 0, {IDLE, 0}) as root");
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rtp.type = RTP_PRIO_NORMAL;
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rtp.prio = 0;
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if (rtprio(RTP_SET, 0, &rtp) < 0)
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err(-1, "rtprio(RTP_SET, 0, {NORMAL, 0) as root");
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rtp.type = RTP_PRIO_REALTIME;
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rtp.prio = 0;
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if (rtprio(RTP_SET, dummy_pid, &rtp) < 0)
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err(-1, "rtprio(RTP_SET, %d, {REALTIME, 0}) as root",
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dummy_pid);
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rtp.type = RTP_PRIO_IDLE;
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rtp.prio = 0;
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if (rtprio(RTP_SET, dummy_pid, &rtp) < 0)
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err(-1, "rtprio(RTP_SET, %d, {IDLE, 0}) as root", dummy_pid);
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rtp.type = RTP_PRIO_NORMAL;
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rtp.prio = 0;
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if (rtprio(RTP_SET, dummy_pid, &rtp) < 0)
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err(-1, "rtprio(RTP_SET, %d, {NORMAL, 0) as root",
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dummy_pid);
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/*
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* Then test again as a different credential.
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*/
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if (setresuid(UID_OTHER, UID_OTHER, UID_OTHER) < 0)
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err(-1, "setresuid(%d)", UID_OTHER);
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rtp.type = RTP_PRIO_REALTIME;
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rtp.prio = 0;
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error = rtprio(RTP_SET, 0, &rtp);
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if (error == 0)
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errx(-1,
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"rtprio(RTP_SET, 0, {REALTIME, 0}) succeeded as !root");
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if (errno != EPERM)
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err(-1, "rtprio(RTP_SET, 0, {REALTIME, 0}) wrong errno %d as"
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" !root", errno);
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rtp.type = RTP_PRIO_IDLE;
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rtp.prio = 0;
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error = rtprio(RTP_SET, 0, &rtp);
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if (error == 0)
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errx(-1, "rtprio(RTP_SET, 0, {IDLE, 0}) succeeded as !root");
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if (errno != EPERM)
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err(-1, "rtprio(RTP_SET, 0, {IDLE, 0}) wrong errno %d as "
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"!root", errno);
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rtp.type = RTP_PRIO_NORMAL;
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rtp.prio = 0;
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if (rtprio(RTP_SET, 0, &rtp) < 0)
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err(-1, "rtprio(RTP_SET, 0, {NORMAL, 0}) as !root");
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rtp.type = RTP_PRIO_REALTIME;
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rtp.prio = 0;
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error = rtprio(RTP_SET, dummy_pid, &rtp);
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if (error == 0)
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errx(-1,
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"rtprio(RTP_SET, %d, {REALTIME, 0}) succeeded as !root",
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dummy_pid);
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if (errno != EPERM)
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err(-1, "rtprio(RTP_SET, %d, {REALTIME, 0}) wrong errno %d as"
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" !root", dummy_pid, errno);
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rtp.type = RTP_PRIO_IDLE;
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rtp.prio = 0;
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error = rtprio(RTP_SET, dummy_pid, &rtp);
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if (error == 0)
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errx(-1, "rtprio(RTP_SET, %d, {IDLE, 0}) succeeded as !root",
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dummy_pid);
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if (errno != EPERM)
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err(-1,
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"rtprio(RTP_SET, %d, {IDLE, 0}) wrong errno %d as !root",
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dummy_pid, errno);
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rtp.type = RTP_PRIO_NORMAL;
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rtp.prio = 0;
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error = rtprio(RTP_SET, dummy_pid, &rtp);
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if (error == 0)
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errx(-1,
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"rtprio(RTP_SET, %d, {NORMAL, 0) succeeded as !root",
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dummy_pid);
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if (errno != EPERM)
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err(-1, "rtprio(RTP_SET, %d, {NORMAL, 0}) wrong errno %d as "
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"!root", dummy_pid, errno);
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exit(0);
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}
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void
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priv_sched_rtprio(void)
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{
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pid_t dummy_pid, test_pid;
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assert_root();
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/*
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* Set up dummy process, which we will kill before exiting.
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*/
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dummy_pid = fork();
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if (dummy_pid < 0)
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err(-1, "fork - dummy");
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if (dummy_pid == 0) {
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if (setresuid(UID_THIRD, UID_THIRD, UID_THIRD) < 0)
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err(-1, "setresuid(%d)", UID_THIRD);
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dummy();
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}
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sleep(1); /* Allow dummy thread to change uids. */
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test_pid = fork();
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if (test_pid < 0) {
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warn("fork - test");
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collect(-1, dummy_pid);
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return;
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}
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if (test_pid == 0)
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test(dummy_pid);
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collect(test_pid, dummy_pid);
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}
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