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File: [cvs.NetBSD.org] / src / tests / kernel / t_kauth_pr_47598.c (download)

Revision 1.3, Mon Apr 28 08:34:16 2014 UTC (6 years, 5 months ago) by martin
Branch: MAIN
CVS Tags: yamt-pagecache-base9, tls-maxphys-base, tls-earlyentropy-base, prg-localcount2-base3, prg-localcount2-base2, prg-localcount2-base1, prg-localcount2-base, prg-localcount2, phil-wifi-base, phil-wifi-20191119, phil-wifi-20190609, pgoyette-localcount-base, pgoyette-localcount-20170426, pgoyette-localcount-20170320, pgoyette-localcount-20170107, pgoyette-localcount-20161104, pgoyette-localcount-20160806, pgoyette-localcount-20160726, pgoyette-localcount, pgoyette-compat-merge-20190127, pgoyette-compat-base, pgoyette-compat-20190127, pgoyette-compat-20190118, pgoyette-compat-1226, pgoyette-compat-1126, pgoyette-compat-1020, pgoyette-compat-0930, pgoyette-compat-0906, pgoyette-compat-0728, pgoyette-compat-0625, pgoyette-compat-0521, pgoyette-compat-0502, pgoyette-compat-0422, pgoyette-compat-0415, pgoyette-compat-0407, pgoyette-compat-0330, pgoyette-compat-0322, pgoyette-compat-0315, pgoyette-compat, perseant-stdc-iso10646-base, perseant-stdc-iso10646, netbsd-9-base, netbsd-9-1-RELEASE, netbsd-9-0-RELEASE, netbsd-9-0-RC2, netbsd-9-0-RC1, netbsd-9, netbsd-8-base, netbsd-8-2-RELEASE, netbsd-8-1-RELEASE, netbsd-8-1-RC1, netbsd-8-0-RELEASE, netbsd-8-0-RC2, netbsd-8-0-RC1, netbsd-8, netbsd-7-nhusb-base-20170116, netbsd-7-nhusb-base, netbsd-7-nhusb, netbsd-7-base, netbsd-7-2-RELEASE, netbsd-7-1-RELEASE, netbsd-7-1-RC2, netbsd-7-1-RC1, netbsd-7-1-2-RELEASE, netbsd-7-1-1-RELEASE, netbsd-7-1, netbsd-7-0-RELEASE, netbsd-7-0-RC3, netbsd-7-0-RC2, netbsd-7-0-RC1, netbsd-7-0-2-RELEASE, netbsd-7-0-1-RELEASE, netbsd-7-0, netbsd-7, matt-nb8-mediatek-base, matt-nb8-mediatek, localcount-20160914, bouyer-socketcan-base1, bouyer-socketcan-base, bouyer-socketcan
Branch point for: yamt-pagecache, phil-wifi
Changes since 1.2: +51 -10 lines

Skip the curtain test case if curtain is not enabled and we would not
be able to restore it to its old value later due to running at securelevel
above 0.
Previously this would fail and leave curtain enabled untill next reboot (but
causing further runs of the test to suceed, just to maximize confusion).
This went unnoticed initial since most modular test kernels run with options
INSECURE to allow exercising the kernel module loader.

/*-
 * Copyright (c) 2013 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__COPYRIGHT("@(#) Copyright (c) 2013\
 The NetBSD Foundation, inc. All rights reserved.");
__RCSID("$NetBSD: t_kauth_pr_47598.c,v 1.3 2014/04/28 08:34:16 martin Exp $");

#include <errno.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/sysctl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <atf-c.h>

/*
 * helper function
 */
static const char curtain_name[] = "security.models.bsd44.curtain";
static const char securelevel_name[] = "security.models.bsd44.securelevel";

static bool may_lower_curtain(void);
static int get_curtain(void);
static void set_curtain(int newval);

static bool
may_lower_curtain(void)
{
	int seclevel;
	size_t len = sizeof(seclevel);

	if (sysctlbyname(securelevel_name, &seclevel, &len, NULL, 0) != 0)
		atf_tc_fail("failed to read %s", securelevel_name);

	return seclevel <= 0;
}

static int
get_curtain(void)
{
	int curtain;
	size_t len = sizeof(curtain);

	if (sysctlbyname(curtain_name, &curtain, &len, NULL, 0) != 0)
		atf_tc_fail("failed to read %s", curtain_name);

	return curtain;
}

static void
set_curtain(int newval)
{

	if (sysctlbyname(curtain_name, NULL, 0, &newval, sizeof(newval)) != 0)
		atf_tc_fail("failed to set %s to %d", curtain_name, newval);
}

/*
 * PR kern/47598: if security.models.extensions.curtain = 1 we crash when
 * doing a netstat while an embryonic (not yet fully accepted) connection
 * exists.
 * This has been fixed with rev. 1.5 of
 *   src/sys/secmodel/extensions/secmodel_extensions.c.
 */


ATF_TC(kauth_curtain);
ATF_TC_HEAD(kauth_curtain, tc)
{
	atf_tc_set_md_var(tc, "require.user", "root");
	atf_tc_set_md_var(tc, "require.progs", "netstat");
	atf_tc_set_md_var(tc, "descr",
	    "Checks for kernel crash with curtain active (PR kern/47598)");
}

ATF_TC_BODY(kauth_curtain, tc)
{

	int old_curtain, s, s2, err;
	socklen_t slen;
	struct sockaddr_in sa;

	/*
	 * save old value of "curtain" and enable it
	 */
	old_curtain = get_curtain();
	if (old_curtain < 1 && !may_lower_curtain())
		atf_tc_skip("curtain is not enabled and we would not be able"
		    " to drop it later due to securelevel settings");

	set_curtain(1);

	/*
	 * create a socket and bind it to some arbitray free port
	 */
	s = socket(PF_INET, SOCK_STREAM|SOCK_NONBLOCK, 0);
	ATF_REQUIRE(s != -1);
	memset(&sa, 0, sizeof(sa));
	sa.sin_family = AF_INET;
	sa.sin_len = sizeof(sa);
	sa.sin_addr.s_addr = inet_addr("127.0.0.1");
	ATF_REQUIRE(bind(s, (struct sockaddr *)&sa, sizeof(sa))==0);
	ATF_REQUIRE(listen(s, 16)==0);

	/*
	 * extract address and open a connection to the port
	 */
	slen = sizeof(sa);
	ATF_REQUIRE(getsockname(s, (struct sockaddr *)&sa, &slen)==0);
	s2 = socket(PF_INET, SOCK_STREAM|SOCK_NONBLOCK, 0);
	ATF_REQUIRE(s2 != -1);
	printf("port is %d\n", ntohs(sa.sin_port));
	err = connect(s2, (struct sockaddr *)&sa, sizeof(sa));
	ATF_REQUIRE_MSG(err == -1 && errno == EINPROGRESS,
	    "conect returned %d with errno %d", err, errno);
	fflush(stdout);
	fflush(stderr);

	/*
	 * we now have a pending, not yet accepted connection - run netstat
	 */
	system("netstat -aA");

	/*
	 * cleanup
	 */
	close(s2);
	close(s);

	/*
	 * restore old value of curtain
	 */
	set_curtain(old_curtain);
}

ATF_TP_ADD_TCS(tp)
{
	ATF_TP_ADD_TC(tp, kauth_curtain);

	return atf_no_error();
}