tests/kernel/t_kauth_pr_47598.c

   1 /*-
   2  * Copyright (c) 2013 The NetBSD Foundation, Inc.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  15  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  16  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  17  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  18  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  19  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  20  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  21  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  22  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  23  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  24  * POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #include <sys/cdefs.h>
  28 __COPYRIGHT("@(#) Copyright (c) 2013\
  29  The NetBSD Foundation, inc. All rights reserved.");
  30 __RCSID("$NetBSD: t_kauth_pr_47598.c,v 1.3 2014/04/28 08:34:16 martin Exp $");
  31
  32 #include <errno.h>
  33 #include <unistd.h>
  34 #include <stdio.h>
  35 #include <stdlib.h>
  36 #include <sys/sysctl.h>
  37 #include <sys/socket.h>
  38 #include <netinet/in.h>
  39 #include <arpa/inet.h>
  40 #include <atf-c.h>
  41
  42 /*
  43  * helper function
  44  */
  45 static const char curtain_name[] = "security.models.bsd44.curtain";
  46 static const char securelevel_name[] = "security.models.bsd44.securelevel";
  47
  48 static bool may_lower_curtain(void);
  49 static int get_curtain(void);
  50 static void set_curtain(int newval);
  51
  52 static bool
  53 may_lower_curtain(void)
  54 {
  55         int seclevel;
  56         size_t len = sizeof(seclevel);
  57
  58         if (sysctlbyname(securelevel_name, &seclevel, &len, NULL, 0) != 0)
  59                 atf_tc_fail("failed to read %s", securelevel_name);
  60
  61         return seclevel <= 0;
  62 }
  63
  64 static int
  65 get_curtain(void)
  66 {
  67         int curtain;
  68         size_t len = sizeof(curtain);
  69
  70         if (sysctlbyname(curtain_name, &curtain, &len, NULL, 0) != 0)
  71                 atf_tc_fail("failed to read %s", curtain_name);
  72
  73         return curtain;
  74 }
  75
  76 static void
  77 set_curtain(int newval)
  78 {
  79
  80         if (sysctlbyname(curtain_name, NULL, 0, &newval, sizeof(newval)) != 0)
  81                 atf_tc_fail("failed to set %s to %d", curtain_name, newval);
  82 }
  83
  84 /*
  85  * PR kern/47598: if security.models.extensions.curtain = 1 we crash when
  86  * doing a netstat while an embryonic (not yet fully accepted) connection
  87  * exists.
  88  * This has been fixed with rev. 1.5 of
  89  *   src/sys/secmodel/extensions/secmodel_extensions.c.
  90  */
  91
  92
  93 ATF_TC(kauth_curtain);
  94 ATF_TC_HEAD(kauth_curtain, tc)
  95 {
  96         atf_tc_set_md_var(tc, "require.user", "root");
  97         atf_tc_set_md_var(tc, "require.progs", "netstat");
  98         atf_tc_set_md_var(tc, "descr",
  99             "Checks for kernel crash with curtain active (PR kern/47598)");
 100 }
 101
 102 ATF_TC_BODY(kauth_curtain, tc)
 103 {
 104
 105         int old_curtain, s, s2, err;
 106         socklen_t slen;
 107         struct sockaddr_in sa;
 108
 109         /*
 110          * save old value of "curtain" and enable it
 111          */
 112         old_curtain = get_curtain();
 113         if (old_curtain < 1 && !may_lower_curtain())
 114                 atf_tc_skip("curtain is not enabled and we would not be able"
 115                     " to drop it later due to securelevel settings");
 116
 117         set_curtain(1);
 118
 119         /*
 120          * create a socket and bind it to some arbitray free port
 121          */
 122         s = socket(PF_INET, SOCK_STREAM|SOCK_NONBLOCK, 0);
 123         ATF_REQUIRE(s != -1);
 124         memset(&sa, 0, sizeof(sa));
 125         sa.sin_family = AF_INET;
 126         sa.sin_len = sizeof(sa);
 127         sa.sin_addr.s_addr = inet_addr("127.0.0.1");
 128         ATF_REQUIRE(bind(s, (struct sockaddr *)&sa, sizeof(sa))==0);
 129         ATF_REQUIRE(listen(s, 16)==0);
 130
 131         /*
 132          * extract address and open a connection to the port
 133          */
 134         slen = sizeof(sa);
 135         ATF_REQUIRE(getsockname(s, (struct sockaddr *)&sa, &slen)==0);
 136         s2 = socket(PF_INET, SOCK_STREAM|SOCK_NONBLOCK, 0);
 137         ATF_REQUIRE(s2 != -1);
 138         printf("port is %d\n", ntohs(sa.sin_port));
 139         err = connect(s2, (struct sockaddr *)&sa, sizeof(sa));
 140         ATF_REQUIRE_MSG(err == -1 && errno == EINPROGRESS,
 141             "conect returned %d with errno %d", err, errno);
 142         fflush(stdout);
 143         fflush(stderr);
 144
 145         /*
 146          * we now have a pending, not yet accepted connection - run netstat
 147          */
 148         system("netstat -aA");
 149
 150         /*
 151          * cleanup
 152          */
 153         close(s2);
 154         close(s);
 155
 156         /*
 157          * restore old value of curtain
 158          */
 159         set_curtain(old_curtain);
 160 }
 161
 162 ATF_TP_ADD_TCS(tp)
 163 {
 164         ATF_TP_ADD_TC(tp, kauth_curtain);
 165
 166         return atf_no_error();
 167 }
 168
 169