242 lines
6.0 KiB
Groff
242 lines
6.0 KiB
Groff
.\"
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.\" Copyright (c) 2013 The FreeBSD Foundation
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.\" All rights reserved.
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.\"
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.\" This documentation was written by Pawel Jakub Dawidek under sponsorship
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.\" from the FreeBSD Foundation.
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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 AUTHOR 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 AUTHOR 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 March 27, 2014
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.Dt CAP_RIGHTS_INIT 3
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.Os
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.Sh NAME
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.Nm cap_rights_init ,
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.Nm cap_rights_set ,
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.Nm cap_rights_clear ,
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.Nm cap_rights_is_set ,
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.Nm cap_rights_is_valid ,
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.Nm cap_rights_merge ,
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.Nm cap_rights_remove ,
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.Nm cap_rights_contains
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.Nd manage cap_rights_t structure
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In sys/capsicum.h
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.Ft cap_rights_t *
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.Fn cap_rights_init "cap_rights_t *rights" "..."
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.Ft cap_rights_t *
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.Fn cap_rights_set "cap_rights_t *rights" "..."
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.Ft cap_rights_t *
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.Fn cap_rights_clear "cap_rights_t *rights" "..."
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.Ft bool
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.Fn cap_rights_is_set "const cap_rights_t *rights" "..."
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.Ft bool
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.Fn cap_rights_is_valid "const cap_rights_t *rights"
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.Ft cap_rights_t *
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.Fn cap_rights_merge "cap_rights_t *dst" "const cap_rights_t *src"
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.Ft cap_rights_t *
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.Fn cap_rights_remove "cap_rights_t *dst" "const cap_rights_t *src"
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.Ft bool
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.Fn cap_rights_contains "const cap_rights_t *big" "const cap_rights_t *little"
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.Sh DESCRIPTION
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The functions documented here allow to manage the
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.Vt cap_rights_t
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structure.
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.Pp
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Capability rights should be separated with comma when passed to the
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.Fn cap_rights_init ,
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.Fn cap_rights_set ,
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.Fn cap_rights_clear
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and
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.Fn cap_rights_is_set
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functions.
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For example:
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.Bd -literal
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cap_rights_set(&rights, CAP_READ, CAP_WRITE, CAP_FSTAT, CAP_SEEK);
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.Ed
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.Pp
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The complete list of the capability rights can be found in the
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.Xr rights 4
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manual page.
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.Pp
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The
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.Fn cap_rights_init
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function initialize provided
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.Vt cap_rights_t
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structure.
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Only properly initialized structure can be passed to the remaining functions.
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For convenience the structure can be filled with capability rights instead of
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calling the
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.Fn cap_rights_set
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function later.
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For even more convenience pointer to the given structure is returned, so it can
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be directly passed to
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.Xr cap_rights_limit 2 :
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.Bd -literal
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cap_rights_t rights;
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if (cap_rights_limit(fd, cap_rights_init(&rights, CAP_READ, CAP_WRITE)) < 0)
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err(1, "Unable to limit capability rights");
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.Ed
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.Pp
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The
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.Fn cap_rights_set
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function adds the given capability rights to the given
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.Vt cap_rights_t
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structure.
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.Pp
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The
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.Fn cap_rights_clear
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function removes the given capability rights from the given
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.Vt cap_rights_t
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structure.
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.Pp
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The
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.Fn cap_rights_is_set
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function checks if all the given capability rights are set for the given
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.Vt cap_rights_t
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structure.
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.Pp
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The
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.Fn cap_rights_is_valid
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function verifies if the given
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.Vt cap_rights_t
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structure is valid.
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.Pp
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The
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.Fn cap_rights_merge
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function merges all capability rights present in the
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.Fa src
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structure into the
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.Fa dst
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structure.
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.Pp
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The
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.Fn cap_rights_remove
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function removes all capability rights present in the
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.Fa src
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structure from the
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.Fa dst
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structure.
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.Pp
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The
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.Fn cap_rights_contains
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function checks if the
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.Fa big
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structure contains all capability rights present in the
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.Fa little
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structure.
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.Sh RETURN VALUES
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The functions never fail.
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In case an invalid capability right or an invalid
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.Vt cap_rights_t
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structure is given as an argument, the program will be aborted.
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.Pp
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The
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.Fn cap_rights_init ,
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.Fn cap_rights_set
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and
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.Fn cap_rights_clear
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functions return pointer to the
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.Vt cap_rights_t
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structure given in the
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.Fa rights
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argument.
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.Pp
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The
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.Fn cap_rights_merge
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and
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.Fn cap_rights_remove
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functions return pointer to the
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.Vt cap_rights_t
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structure given in the
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.Fa dst
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argument.
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.Pp
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The
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.Fn cap_rights_is_set
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returns
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.Va true
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if all the given capability rights are set in the
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.Fa rights
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argument.
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.Pp
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The
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.Fn cap_rights_is_valid
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function performs various checks to see if the given
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.Vt cap_rights_t
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structure is valid and returns
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.Va true
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if it is.
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.Pp
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The
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.Fn cap_rights_contains
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function returns
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.Va true
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if all capability rights set in the
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.Fa little
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structure are also present in the
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.Fa big
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structure.
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.Sh EXAMPLES
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The following example demonstrates how to prepare a
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.Vt cap_rights_t
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structure to be passed to the
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.Xr cap_rights_limit 2
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system call.
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.Bd -literal
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cap_rights_t rights;
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int fd;
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fd = open("/tmp/foo", O_RDWR);
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if (fd < 0)
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err(1, "open() failed");
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cap_rights_init(&rights, CAP_FSTAT, CAP_READ);
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if (allow_write_and_seek)
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cap_rights_set(&rights, CAP_WRITE, CAP_SEEK);
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if (dont_allow_seek)
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cap_rights_clear(&rights, CAP_SEEK);
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if (cap_rights_limit(fd, &rights) < 0 && errno != ENOSYS)
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err(1, "cap_rights_limit() failed");
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.Ed
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.Sh SEE ALSO
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.Xr cap_rights_limit 2 ,
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.Xr open 2 ,
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.Xr capsicum 4 ,
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.Xr rights 4
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.Sh HISTORY
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Support for capabilities and capabilities mode was developed as part of the
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.Tn TrustedBSD
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Project.
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.Sh AUTHORS
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This family of functions was created by
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.An Pawel Jakub Dawidek Aq Mt pawel@dawidek.net
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under sponsorship from the FreeBSD Foundation.
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