.\"- .\" Copyright (c) 2000 Robert N. M. Watson .\" All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" .\" $FreeBSD$ .\" .\" TrustedBSD Project - support for POSIX.1e process capabilities .\" .Dd April 1, 2000 .Dt CAP 3 .Os FreeBSD 5.0 .Sh NAME .Nm cap .Nd introduction to the POSIX.1e Capability security API .Sh SYNOPSIS .Fd #include .Fd #include .Sh DESCRIPTION The POSIX.1e Capability interface allows processes to manipulate their capability set, subject to capability manipulation restrictions imposed by the kernel. Using the capability API, a process may request a copy of its capability state, modify the copy of the state, and resubmit the state for use, if permitted. .Pp A variety of functions are provided for manipulating and managing process capability state and working store state: .Bl -tag -width cap_get_flagXX .It Fn cap_init This function is described in .Xr cap_init 3 , and may be used to allocate a fresh capability structure with no capability flags set. .It Fn cap_clear This function is described in .Xr cap_clear 3 , and clears all capability flags in a capability structure. .It Fn cap_dup This function is described in .Xr cap_dup 3 , and may be used to duplicate a capability structure. .It Fn cap_free This function is described in .Xr cap_free 3 , and may be used to free a capability structure. .It Fn cap_get_flag This function, described in .Xr cap_get_flag 3 , allows retrieval of a capability flag value from capability state in working store. .It Fn cap_get_proc This function, described in .Xr cap_get_proc 3 , allows retrieval of capability state for the current process. .It Fn cap_set_flag This function, described in .Xr cap_set_flag 3 , allows setting of capability flag values in a capability structure held in the working store. .It Fn cap_set_proc This function, described in .Xr cap_set_proc 3 , allows setting of the current process capability state. .El .Pp Documentation of the internal kernel interfaces backing these calls may be found in .Xr cap 9 . The syscalls between the internal interfaces and the public library routines may change over time, and as such are not documented. They are not intended to be called directly without going through the library. .Sh IMPLEMENTATION NOTES FreeBSD's support for POSIX.1e interfaces and features is still under development at this time. .Pp POSIX.1e assigns security labels to all objects, extending the security functionality described in POSIX.1. These additional labels provide fine-grained discretionary access control, fine-grained capabilities, and labels necessary for mandatory access control. POSIX.2c describes a set of userland utilities for manipulating these labels. These userland utilities are not bundled with .Fx 5.0 so as to discourage their use in the short term. .\" .Sh FILES .Sh SEE ALSO .Xr cap_clear 3 , .Xr cap_dup 3 , .Xr cap_free 3 , .Xr cap_get_flag 3 , .Xr cap_get_proc 3 , .Xr cap_init 3 , .Xr cap_set_flag 3 , .Xr cap_set_proc 3 , .Xr cap 9 , .Xr posix1e 3 .Sh STANDARDS POSIX.1e is described in IEEE POSIX.1e draft 17. Discussion of the draft continues on the cross-platform POSIX.1e implementation mailing list. To join this list, see the .Fx POSIX.1e implementation page for more information. .Sh HISTORY Support for POSIX.1e Capabilities was developed as part of the TrustedBSD Project. POSIX.1e support was introduced in .Fx 4.0 , and development continues. .Sh AUTHORS .An Robert N M Watson .Sh BUGS These features are not yet included in the base FreeBSD distribution.