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 __BEGIN_DECLS 50 51 static __inline int 52 caph_limit_stream(int fd, int flags) 53 { 54 cap_rights_t rights; 55 unsigned long cmds[] = { TIOCGETA, TIOCGWINSZ, FIODTYPE }; 56 57 cap_rights_init(&rights, CAP_EVENT, CAP_FCNTL, CAP_FSTAT, 58 CAP_IOCTL, CAP_SEEK); 59 60 if ((flags & CAPH_READ) != 0) 61 cap_rights_set(&rights, CAP_READ); 62 if ((flags & CAPH_WRITE) != 0) 63 cap_rights_set(&rights, CAP_WRITE); 64 if ((flags & CAPH_LOOKUP) != 0) 65 cap_rights_set(&rights, CAP_LOOKUP); 66 67 if (cap_rights_limit(fd, &rights) < 0 && errno != ENOSYS) { 68 if (errno == EBADF && (flags & CAPH_IGNORE_EBADF) != 0) 69 return (0); 70 return (-1); 71 } 72 73 if (cap_ioctls_limit(fd, cmds, nitems(cmds)) < 0 && errno != ENOSYS) 74 return (-1); 75 76 if (cap_fcntls_limit(fd, CAP_FCNTL_GETFL) < 0 && errno != ENOSYS) 77 return (-1); 78 79 return (0); 80 } 81 82 static __inline int 83 caph_limit_stdin(void) 84 { 85 86 return (caph_limit_stream(STDIN_FILENO, CAPH_READ)); 87 } 88 89 static __inline int 90 caph_limit_stderr(void) 91 { 92 93 return (caph_limit_stream(STDERR_FILENO, CAPH_WRITE)); 94 } 95 96 static __inline int 97 caph_limit_stdout(void) 98 { 99 100 return (caph_limit_stream(STDOUT_FILENO, CAPH_WRITE)); 101 } 102 103 static __inline int 104 caph_limit_stdio(void) 105 { 106 const int iebadf = CAPH_IGNORE_EBADF; 107 108 if (caph_limit_stream(STDIN_FILENO, CAPH_READ | iebadf) == -1 || 109 caph_limit_stream(STDOUT_FILENO, CAPH_WRITE | iebadf) == -1 || 110 caph_limit_stream(STDERR_FILENO, CAPH_WRITE | iebadf) == -1) 111 return (-1); 112 return (0); 113 } 114 115 static __inline void 116 caph_cache_tzdata(void) 117 { 118 119 tzset(); 120 } 121 122 static __inline void 123 caph_cache_catpages(void) 124 { 125 126 (void)catopen("libc", NL_CAT_LOCALE); 127 } 128 129 static __inline int 130 caph_enter(void) 131 { 132 133 if (cap_enter() < 0 && errno != ENOSYS) 134 return (-1); 135 136 return (0); 137 } 138 139 static __inline int 140 caph_rights_limit(int fd, const cap_rights_t *rights) 141 { 142 143 if (cap_rights_limit(fd, rights) < 0 && errno != ENOSYS) 144 return (-1); 145 146 return (0); 147 } 148 149 static __inline int 150 caph_ioctls_limit(int fd, const unsigned long *cmds, size_t ncmds) 151 { 152 153 if (cap_ioctls_limit(fd, cmds, ncmds) < 0 && errno != ENOSYS) 154 return (-1); 155 156 return (0); 157 } 158 159 static __inline int 160 caph_fcntls_limit(int fd, uint32_t fcntlrights) 161 { 162 163 if (cap_fcntls_limit(fd, fcntlrights) < 0 && errno != ENOSYS) 164 return (-1); 165 166 return (0); 167 } 168 169 static __inline int 170 caph_enter_casper(void) 171 { 172 173 return (CASPER_SUPPORT == 0 ? 0 : caph_enter()); 174 } 175 176 __END_DECLS 177 178 #endif /* _CAPSICUM_HELPERS_H_ */ 179