1 /*- 2 * Copyright (c) 2016 Mariusz Zaborski <oshogbo@FreeBSD.org> 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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29 #ifndef _CAPSICUM_HELPERS_H_ 30 #define _CAPSICUM_HELPERS_H_ 31 32 #include <sys/param.h> 33 #include <sys/capsicum.h> 34 #include <sys/ioctl.h> 35 36 #include <errno.h> 37 #include <nl_types.h> 38 #include <termios.h> 39 #include <time.h> 40 #include <unistd.h> 41 42 #define CAPH_IGNORE_EBADF 0x0001 43 #define CAPH_READ 0x0002 44 #define CAPH_WRITE 0x0004 45 #define CAPH_LOOKUP 0x0008 46 47 static __inline int 48 caph_limit_stream(int fd, int flags) 49 { 50 cap_rights_t rights; 51 unsigned long cmds[] = { TIOCGETA, TIOCGWINSZ, FIODTYPE }; 52 53 cap_rights_init(&rights, CAP_FCNTL, CAP_FSTAT, CAP_IOCTL); 54 55 if ((flags & CAPH_READ) != 0) 56 cap_rights_set(&rights, CAP_READ); 57 if ((flags & CAPH_WRITE) != 0) 58 cap_rights_set(&rights, CAP_WRITE); 59 if ((flags & CAPH_LOOKUP) != 0) 60 cap_rights_set(&rights, CAP_LOOKUP); 61 62 if (cap_rights_limit(fd, &rights) < 0 && errno != ENOSYS) { 63 if (errno == EBADF && (flags & CAPH_IGNORE_EBADF) != 0) 64 return (0); 65 return (-1); 66 } 67 68 if (cap_ioctls_limit(fd, cmds, nitems(cmds)) < 0 && errno != ENOSYS) 69 return (-1); 70 71 if (cap_fcntls_limit(fd, CAP_FCNTL_GETFL) < 0 && errno != ENOSYS) 72 return (-1); 73 74 return (0); 75 } 76 77 static __inline int 78 caph_limit_stdin(void) 79 { 80 81 return (caph_limit_stream(STDIN_FILENO, CAPH_READ)); 82 } 83 84 static __inline int 85 caph_limit_stderr(void) 86 { 87 88 return (caph_limit_stream(STDERR_FILENO, CAPH_WRITE)); 89 } 90 91 static __inline int 92 caph_limit_stdout(void) 93 { 94 95 return (caph_limit_stream(STDOUT_FILENO, CAPH_WRITE)); 96 } 97 98 static __inline int 99 caph_limit_stdio(void) 100 { 101 const int iebadf = CAPH_IGNORE_EBADF; 102 103 if (caph_limit_stream(STDIN_FILENO, CAPH_READ | iebadf) == -1 || 104 caph_limit_stream(STDOUT_FILENO, CAPH_WRITE | iebadf) == -1 || 105 caph_limit_stream(STDERR_FILENO, CAPH_WRITE | iebadf) == -1) 106 return (-1); 107 return (0); 108 } 109 110 static __inline void 111 caph_cache_tzdata(void) 112 { 113 114 tzset(); 115 } 116 117 static __inline void 118 caph_cache_catpages(void) 119 { 120 121 (void)catopen("libc", NL_CAT_LOCALE); 122 } 123 124 #endif /* _CAPSICUM_HELPERS_H_ */ 125