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
90 lines
2.7 KiB
C
90 lines
2.7 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 sysctls can only be written with privilege by trying first with,
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* then without privilege. Do this by first reading, then setting the
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* hostname as a no-op.
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*/
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#include <sys/types.h>
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#include <sys/sysctl.h>
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#include <err.h>
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#include "main.h"
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#define KERN_HOSTNAME_STRING "kern.hostname"
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void
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priv_sysctl_write(void)
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{
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char buffer[1024];
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size_t len;
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int error;
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assert_root();
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/*
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* First query the current value.
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*/
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len = sizeof(buffer);
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error = sysctlbyname(KERN_HOSTNAME_STRING, buffer, &len, NULL, 0);
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if (error)
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err(-1, "sysctlbyname(\"%s\") query", KERN_HOSTNAME_STRING);
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/*
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* Now try to set with privilege.
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*/
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error = sysctlbyname(KERN_HOSTNAME_STRING, NULL, NULL, buffer,
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strlen(buffer));
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if (error)
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err(-1, "sysctlbyname(\"%s\") set as root",
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KERN_HOSTNAME_STRING);
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/*
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* Now without privilege.
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*/
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set_euid(UID_OTHER);
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error = sysctlbyname(KERN_HOSTNAME_STRING, NULL, NULL, buffer,
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strlen(buffer));
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if (error == 0)
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errx(-1, "sysctlbyname(\"%s\") succeeded as !root",
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KERN_HOSTNAME_STRING);
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if (errno != EPERM)
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err(-1, "sysctlbyname(\"%s\") wrong errno %d",
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KERN_HOSTNAME_STRING, errno);
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}
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