ce5697ce5d
The caph_enter function should made it easier to sandbox application and not force us to remember that we need to check errno on failure. Another function is also checking if casper is present. Reviewed by: emaste, cem (partially) Differential Revision: https://reviews.freebsd.org/D14557
129 lines
3.5 KiB
Groff
129 lines
3.5 KiB
Groff
.\" Copyright (c) 2016 Mariusz Zaborski <oshogbo@FreeBSD.org>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd May 7, 2018
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.Dt CAPSICUM_HELPERS 3
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.Os
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.Sh NAME
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.Nm caph_limit_stream ,
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.Nm caph_limit_stdin ,
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.Nm caph_limit_stderr ,
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.Nm caph_limit_stdout ,
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.Nm caph_limit_stdio ,
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.Nm caph_cache_tzdata ,
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.Nm caph_cache_catpages
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.Nd "set of the functions , part of the libcapsicum"
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.Sh LIBRARY
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.Lb libcapsicum
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.Sh SYNOPSIS
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.In capsicum_helpers.h
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.Ft int
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.Fn caph_enter "void"
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.Ft int
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.Fn caph_enter_casper "void"
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.Ft int
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.Fn caph_limit_stream "int fd, int flags"
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.Ft int
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.Fn caph_limit_stdin "void"
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.Ft int
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.Fn caph_limit_stderr "void"
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.Ft int
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.Fn caph_limit_stdout "void"
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.Ft int
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.Fn caph_limit_stdio "void"
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.Ft void
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.Fn caph_cache_tzdata "void"
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.Ft void
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.Fn caph_cache_catpages "void"
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.Sh DESCRIPTION
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The
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.Nm caph_enter
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is equivalent to the
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.Xr cap_enter 2
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it returns success when the kernel is built without support of the capability
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mode.
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.Pp
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The
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.Nm caph_enter_casper
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is equivalent to the
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.Nm caph_enter
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it returns success when the system is built without Casper support.
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.Pp
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The
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.Nm capsicum helpers
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are a set of a inline functions which simplify modifying programs to use
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Capsicum.
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The goal is to reduce duplicated code patterns.
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The
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.Nm capsicum helpers
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are part of
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.Nm libcapsicum
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but there is no need to link to the library.
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.Pp
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.Fn caph_limit_stream
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restricts capabilities on
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.Fa fd
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to only those needed by POSIX stream objects (that is, FILEs).
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.Pp
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These flags can be provided:
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.Pp
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.Bl -tag -width "CAPH_IGNORE_EBADF" -compact -offset indent
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.It Dv CAPH_IGNORE_EBADF
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Do not return an error if file descriptor is invalid.
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.It Dv CAPH_READ
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Set CAP_READ on limited descriptor.
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.It Dv CAPH_WRITE
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Set CAP_WRITE on limited descriptor.
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.El
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.Pp
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.Fn caph_limit_stdin ,
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.Fn caph_limit_stderr
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and
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.Fn caph_limit_stdout
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limit standard descriptors using the
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.Nm caph_limit_stream
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function.
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.Pp
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.Fn caph_limit_stdio
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limits stdin, stderr and stdout.
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.Pp
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.Fn caph_cache_tzdata
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precaches all timezone data needed to use
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.Li libc
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local time functions.
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.Pp
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.Fn caph_cache_catpages
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caches Native Language Support (NLS) data.
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NLS data is used for localized error printing by
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.Xr strerror 3
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and
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.Xr err 3 ,
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among others.
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.Ed
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.Sh SEE ALSO
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.Xr cap_enter 2 ,
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.Xr rights 4
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