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 #include <libcasper.h> 43 44 #define CAPH_IGNORE_EBADF 0x0001 45 #define CAPH_READ 0x0002 46 #define CAPH_WRITE 0x0004 47 #define CAPH_LOOKUP 0x0008 48 49 static __inline int 50 caph_limit_stream(int fd, int flags) 51 { 52 cap_rights_t rights; 53 unsigned long cmds[] = { TIOCGETA, TIOCGWINSZ, FIODTYPE }; 54 55 cap_rights_init(&rights, CAP_EVENT, CAP_FCNTL, CAP_FSTAT, 56 CAP_IOCTL, CAP_SEEK); 57 58 if ((flags & CAPH_READ) != 0) 59 cap_rights_set(&rights, CAP_READ); 60 if ((flags & CAPH_WRITE) != 0) 61 cap_rights_set(&rights, CAP_WRITE); 62 if ((flags & CAPH_LOOKUP) != 0) 63 cap_rights_set(&rights, CAP_LOOKUP); 64 65 if (cap_rights_limit(fd, &rights) < 0 && errno != ENOSYS) { 66 if (errno == EBADF && (flags & CAPH_IGNORE_EBADF) != 0) 67 return (0); 68 return (-1); 69 } 70 71 if (cap_ioctls_limit(fd, cmds, nitems(cmds)) < 0 && errno != ENOSYS) 72 return (-1); 73 74 if (cap_fcntls_limit(fd, CAP_FCNTL_GETFL) < 0 && errno != ENOSYS) 75 return (-1); 76 77 return (0); 78 } 79 80 static __inline int 81 caph_limit_stdin(void) 82 { 83 84 return (caph_limit_stream(STDIN_FILENO, CAPH_READ)); 85 } 86 87 static __inline int 88 caph_limit_stderr(void) 89 { 90 91 return (caph_limit_stream(STDERR_FILENO, CAPH_WRITE)); 92 } 93 94 static __inline int 95 caph_limit_stdout(void) 96 { 97 98 return (caph_limit_stream(STDOUT_FILENO, CAPH_WRITE)); 99 } 100 101 static __inline int 102 caph_limit_stdio(void) 103 { 104 const int iebadf = CAPH_IGNORE_EBADF; 105 106 if (caph_limit_stream(STDIN_FILENO, CAPH_READ | iebadf) == -1 || 107 caph_limit_stream(STDOUT_FILENO, CAPH_WRITE | iebadf) == -1 || 108 caph_limit_stream(STDERR_FILENO, CAPH_WRITE | iebadf) == -1) 109 return (-1); 110 return (0); 111 } 112 113 static __inline void 114 caph_cache_tzdata(void) 115 { 116 117 tzset(); 118 } 119 120 static __inline void 121 caph_cache_catpages(void) 122 { 123 124 (void)catopen("libc", NL_CAT_LOCALE); 125 } 126 127 static __inline int 128 caph_enter(void) 129 { 130 131 if (cap_enter() < 0 && errno != ENOSYS) 132 return (-1); 133 134 return (0); 135 } 136 137 138 static __inline int 139 caph_enter_casper(void) 140 { 141 142 return (CASPER_SUPPORT == 0 ? 0 : caph_enter()); 143 } 144 145 #endif /* _CAPSICUM_HELPERS_H_ */ 146