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 1.6 2022/01/26 11:48:54 andvar 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 arbitrary free port 121 */ 122 s = socket(PF_INET, SOCK_STREAM|SOCK_NONBLOCK, 0); 123 ATF_REQUIRE_MSG(s != -1, "socket: %d", errno); 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_MSG(bind(s, (struct sockaddr *)&sa, sizeof(sa)) == 0, 129 "bind: %d", errno); 130 ATF_REQUIRE_MSG(listen(s, 16) == 0, "listen: %d", errno); 131 132 /* 133 * extract address and open a connection to the port 134 */ 135 slen = sizeof(sa); 136 ATF_REQUIRE_MSG(getsockname(s, (struct sockaddr *)&sa, &slen) == 0, 137 "getsockname: %d", errno); 138 s2 = socket(PF_INET, SOCK_STREAM|SOCK_NONBLOCK, 0); 139 ATF_REQUIRE_MSG(s2 != -1, "socket: %d", errno); 140 printf("port is %d\n", ntohs(sa.sin_port)); 141 err = connect(s2, (struct sockaddr *)&sa, sizeof(sa)); 142 ATF_REQUIRE_MSG(err == -1 && errno == EINPROGRESS, 143 "connect returned %d with errno %d", err, errno); 144 fflush(stdout); 145 fflush(stderr); 146 147 /* 148 * we now have a pending, not yet accepted connection - run netstat 149 */ 150 system("netstat -aA"); 151 152 /* 153 * cleanup 154 */ 155 close(s2); 156 close(s); 157 158 /* 159 * restore old value of curtain 160 */ 161 set_curtain(old_curtain); 162 } 163 164 ATF_TP_ADD_TCS(tp) 165 { 166 ATF_TP_ADD_TC(tp, kauth_curtain); 167 168 return atf_no_error(); 169 } 170 171 172