1 .\" Copyright (c) 2016 Mariusz Zaborski <oshogbo@FreeBSD.org>
2 .\" All rights reserved.
4 .\" Redistribution and use in source and binary forms, with or without
5 .\" modification, are permitted provided that the following conditions
7 .\" 1. Redistributions of source code must retain the above copyright
8 .\" notice, this list of conditions and the following disclaimer.
9 .\" 2. Redistributions in binary form must reproduce the above copyright
10 .\" notice, this list of conditions and the following disclaimer in the
11 .\" documentation and/or other materials provided with the distribution.
13 .\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
14 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 .\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
17 .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 .Dt CAPSICUM_HELPERS 3
31 .Nm caph_limit_stream ,
32 .Nm caph_limit_stdin ,
33 .Nm caph_limit_stderr ,
34 .Nm caph_limit_stdout ,
35 .Nm caph_limit_stdio ,
36 .Nm caph_cache_tzdata ,
37 .Nm caph_cache_catpages ,
39 .Nm caph_enter_casper ,
40 .Nm caph_rights_limit ,
41 .Nm caph_ioctls_limit ,
43 .Nd "set of the capsicum helpers, part of the libcapsicum"
47 .In capsicum_helpers.h
51 .Fn caph_enter_casper "void"
53 .Fn caph_rights_limit "int fd" "const cap_righst_t *rights"
55 .Fn caph_ioctls_limit "int fd" "const unsigned long *cmds" "size_t ncmds"
57 .Fn caph_fcntls_limit "int fd" "uint32_t fcntlrights"
59 .Fn caph_limit_stream "int fd" "int flags"
61 .Fn caph_limit_stdin "void"
63 .Fn caph_limit_stderr "void"
65 .Fn caph_limit_stdout "void"
67 .Fn caph_limit_stdio "void"
69 .Fn caph_cache_tzdata "void"
71 .Fn caph_cache_catpages "void"
75 .Nm caph_rights_limit ,
79 are respectively equivalent to
81 .Xr cap_rights_limit 2 ,
82 .Xr cap_ioctls_limit 2
84 .Xr cap_fcntls_limit 2 ,
85 it returns success when the kernel is built without support of the capability
92 it returns success when the system is built without Casper support.
96 are a set of a inline functions which simplify modifying programs to use
98 The goal is to reduce duplicated code patterns.
103 but there is no need to link to the library.
105 .Fn caph_limit_stream
106 restricts capabilities on
108 to only those needed by POSIX stream objects (that is, FILEs).
110 These flags can be provided:
112 .Bl -tag -width "CAPH_IGNORE_EBADF" -compact -offset indent
113 .It Dv CAPH_IGNORE_EBADF
114 Do not return an error if file descriptor is invalid.
116 Set CAP_READ on limited descriptor.
118 Set CAP_WRITE on limited descriptor.
121 .Fn caph_limit_stdin ,
122 .Fn caph_limit_stderr
124 .Fn caph_limit_stdout
125 limit standard descriptors using the
126 .Nm caph_limit_stream
130 limits stdin, stderr and stdout.
132 .Fn caph_cache_tzdata
133 precaches all timezone data needed to use
135 local time functions.
137 .Fn caph_cache_catpages
138 caches Native Language Support (NLS) data.
139 NLS data is used for localized error printing by
147 .Xr cap_rights_limit 2 ,