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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
138 lines
4.2 KiB
C
138 lines
4.2 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 that raising current resource limits above hard resource limits
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* requires privilege. There is one privilege check, but two conditions:
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*
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* - To raise the current above the maximum.
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*
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* - To raise the maximum.
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*/
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <err.h>
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#include <errno.h>
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#include <unistd.h>
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#include "main.h"
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void
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priv_proc_setrlimit(void)
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{
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struct rlimit rl, rl_lower, rl_raise_max, rl_raise_cur;
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int error;
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assert_root();
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/*
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* To make sure that there is room to raise the resource limit, we
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* must first lower it. Otherwise, if the resource limit is already
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* at the global maximum, that complicates matters. In principle, we
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* can bump into privilege failures during setup, but there's not
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* much we can do about that. Keep this prototypical setting around
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* as the target to restore to later.
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*/
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if (getrlimit(RLIMIT_DATA, &rl) < 0)
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err(-1, "getrlimit(RLIMIT_DATA)");
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/*
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* What to lower to before trying to raise.
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*/
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rl_lower = rl;
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rl_lower.rlim_cur -= 10;
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rl_lower.rlim_max = rl_lower.rlim_cur;
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/*
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* Raise the maximum.
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*/
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rl_raise_max = rl;
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rl_raise_max.rlim_max += 10;
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/*
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* Raise the current above the maximum.
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*/
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rl_raise_cur = rl;
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rl_raise_cur.rlim_cur += 10;
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/*
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* Test raising the maximum with privilege.
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*/
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if (setrlimit(RLIMIT_DATA, &rl_lower) < 0)
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err(-1, "setrlimit(RLIMIT_DATA, lower) as root");
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if (setrlimit(RLIMIT_DATA, &rl_raise_max) < 0)
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err(-1, "setrlimit(RLIMIT_DATA, raise_max) as root");
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/*
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* Test raising the current above the maximum with privilege.
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*/
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if (setrlimit(RLIMIT_DATA, &rl_lower) < 0)
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err(-1, "setrlimit(RLIMIT_DATA, lower) as root");
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if (setrlimit(RLIMIT_DATA, &rl_raise_cur) < 0)
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err(-1, "setrlimit(RLIMIT_DATA, raise_cur) as root");
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/*
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* Test raising the maximum without privilege.
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*/
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if (setrlimit(RLIMIT_DATA, &rl_lower) < 0)
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err(-1, "setrlimit(RLIMIT_DATA, lower) as root");
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set_euid(UID_OTHER);
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error = setrlimit(RLIMIT_DATA, &rl_raise_max);
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if (error == 0)
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errx(-1,
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"setrlimit(RLIMIT_DATA, raise_max) succeeded as !root");
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if (errno != EPERM)
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err(-1, "setrlimit(RLIMIT_DATA, raise_max) wrong errno %d "
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"as !root", errno);
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/*
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* Test raising the current above the maximum without privilege.
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*/
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set_euid(UID_ROOT);
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if (setrlimit(RLIMIT_DATA, &rl_lower) < 0)
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err(-1, "setrlimit(RLIMIT_DATA, lower) as root");
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set_euid(UID_OTHER);
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error = setrlimit(RLIMIT_DATA, &rl_raise_cur);
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if (error == 0)
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errx(-1,
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"setrlimit(RLIMIT_DATA, raise_cur) succeeded as !root");
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if (errno != EPERM)
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err(-1, "setrlimit(RLIMIT_DATA, raise_cur) wrong errno %d "
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"as !root", errno);
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}
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