cap_test_fcntl.c revision 302408
1/*- 2 * Copyright (c) 2009-2011 Robert N. M. Watson 3 * Copyright (c) 2011 Jonathan Anderson 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28/* 29 * Test that fcntl works in capability mode. 30 */ 31 32#include <sys/cdefs.h> 33__FBSDID("$FreeBSD: stable/11/tools/regression/security/cap_test/cap_test_fcntl.c 263234 2014-03-16 11:04:44Z rwatson $"); 34 35#include <sys/types.h> 36#include <sys/capsicum.h> 37#include <sys/errno.h> 38#include <sys/ipc.h> 39#include <sys/mman.h> 40#include <sys/socket.h> 41#include <sys/stat.h> 42#include <sys/sysctl.h> 43#include <sys/wait.h> 44 45#include <err.h> 46#include <fcntl.h> 47#include <stdio.h> 48#include <stdlib.h> 49#include <unistd.h> 50 51#include "cap_test.h" 52 53/* A filename->descriptor mapping. */ 54struct fd { 55 char *f_name; 56 int f_fd; 57}; 58 59/* 60 * Ensure that fcntl() works consistently for both regular file descriptors and 61 * capability-wrapped ones. 62 */ 63int 64test_fcntl(void) 65{ 66 int success = PASSED; 67 cap_rights_t rights = CAP_READ | CAP_FCNTL; 68 69 /* 70 * Open some files of different types, and wrap them in capabilities. 71 */ 72 struct fd files[] = { 73 { "file", open("/etc/passwd", O_RDONLY) }, 74 { "socket", socket(PF_LOCAL, SOCK_STREAM, 0) }, 75 { "SHM", shm_open(SHM_ANON, O_RDWR, 0600) }, 76 }; 77 REQUIRE(files[0].f_fd); 78 REQUIRE(files[1].f_fd); 79 REQUIRE(files[2].f_fd); 80 81 struct fd caps[] = { 82 { "file cap", cap_new(files[0].f_fd, rights) }, 83 { "socket cap", cap_new(files[1].f_fd, rights) }, 84 { "SHM cap", cap_new(files[2].f_fd, rights) }, 85 }; 86 REQUIRE(caps[0].f_fd); 87 REQUIRE(caps[1].f_fd); 88 REQUIRE(caps[2].f_fd); 89 90 struct fd all[] = { 91 files[0], caps[0], 92 files[1], caps[1], 93 files[2], caps[2], 94 }; 95 const size_t len = sizeof(all) / sizeof(struct fd); 96 97 REQUIRE(cap_enter()); 98 99 /* 100 * Ensure that we can fcntl() all the files that we opened above. 101 */ 102 for (size_t i = 0; i < len; i++) 103 { 104 struct fd f = all[i]; 105 int cap; 106 107 CHECK_SYSCALL_SUCCEEDS(fcntl, f.f_fd, F_GETFL, 0); 108 REQUIRE(cap = cap_new(f.f_fd, CAP_READ)); 109 if (fcntl(f.f_fd, F_GETFL, 0) == -1) 110 FAIL("Error calling fcntl('%s', F_GETFL)", f.f_name); 111 else 112 CHECK_NOTCAPABLE(fcntl, cap, F_GETFL, 0); 113 } 114 115 return (success); 116} 117 118