2 * Copyright (c) 2016 Mariusz Zaborski <oshogbo@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
29 #ifndef _CAPSICUM_HELPERS_H_
30 #define _CAPSICUM_HELPERS_H_
32 #include <sys/param.h>
33 #include <sys/capsicum.h>
34 #include <sys/ioctl.h>
42 #include <libcasper.h>
44 #define CAPH_IGNORE_EBADF 0x0001
45 #define CAPH_READ 0x0002
46 #define CAPH_WRITE 0x0004
47 #define CAPH_LOOKUP 0x0008
51 static const unsigned long caph_stream_cmds[] =
52 { TIOCGETA, TIOCGWINSZ, FIODTYPE };
53 static const uint32_t caph_stream_fcntls = CAP_FCNTL_GETFL;
56 caph_stream_rights(cap_rights_t *rights, int flags)
59 cap_rights_init(rights, CAP_EVENT, CAP_FCNTL, CAP_FSTAT,
62 if ((flags & CAPH_READ) != 0)
63 cap_rights_set(rights, CAP_READ);
64 if ((flags & CAPH_WRITE) != 0)
65 cap_rights_set(rights, CAP_WRITE);
66 if ((flags & CAPH_LOOKUP) != 0)
67 cap_rights_set(rights, CAP_LOOKUP);
71 caph_limit_stream(int fd, int flags)
75 caph_stream_rights(&rights, flags);
76 if (cap_rights_limit(fd, &rights) < 0 && errno != ENOSYS) {
77 if (errno == EBADF && (flags & CAPH_IGNORE_EBADF) != 0)
82 if (cap_ioctls_limit(fd, caph_stream_cmds,
83 nitems(caph_stream_cmds)) < 0 && errno != ENOSYS)
86 if (cap_fcntls_limit(fd, caph_stream_fcntls) < 0 && errno != ENOSYS)
93 caph_limit_stdin(void)
96 return (caph_limit_stream(STDIN_FILENO, CAPH_READ));
100 caph_limit_stderr(void)
103 return (caph_limit_stream(STDERR_FILENO, CAPH_WRITE));
107 caph_limit_stdout(void)
110 return (caph_limit_stream(STDOUT_FILENO, CAPH_WRITE));
114 caph_limit_stdio(void)
116 const int iebadf = CAPH_IGNORE_EBADF;
118 if (caph_limit_stream(STDIN_FILENO, CAPH_READ | iebadf) == -1 ||
119 caph_limit_stream(STDOUT_FILENO, CAPH_WRITE | iebadf) == -1 ||
120 caph_limit_stream(STDERR_FILENO, CAPH_WRITE | iebadf) == -1)
126 caph_cache_tzdata(void)
133 caph_cache_catpages(void)
136 (void)catopen("libc", NL_CAT_LOCALE);
143 if (cap_enter() < 0 && errno != ENOSYS)
150 caph_rights_limit(int fd, const cap_rights_t *rights)
153 if (cap_rights_limit(fd, rights) < 0 && errno != ENOSYS)
160 caph_ioctls_limit(int fd, const unsigned long *cmds, size_t ncmds)
163 if (cap_ioctls_limit(fd, cmds, ncmds) < 0 && errno != ENOSYS)
170 caph_fcntls_limit(int fd, uint32_t fcntlrights)
173 if (cap_fcntls_limit(fd, fcntlrights) < 0 && errno != ENOSYS)
180 caph_enter_casper(void)
183 return (CASPER_SUPPORT == 0 ? 0 : caph_enter());
188 #endif /* _CAPSICUM_HELPERS_H_ */