Now that the code is in place to audit capability method rights, start
using it to audit the 'rights' argument to cap_new(2).
Approved by: re (kib), mentor (rwatson)
Sponsored by: Google Inc
Implement two previously-reserved Capsicum system calls:
- cap_new() creates a capability to wrap an existing file descriptor
- cap_getrights() queries the rights mask of a capability.
Approved by: mentor (rwatson), re (Capsicum blanket)
Sponsored by: Google Inc
Code to actually implement Capsicum capabilities, including fileops and
kern_capwrap(), which creates a capability to wrap an existing file
descriptor.
We also modify kern_close() and closef() to handle capabilities.
Finally, remove cap_filelist from struct capability, since we don't
actually need it.
Approved by: mentor (rwatson), re (Capsicum blanket)
Sponsored by: Google Inc
cap_funwrap() and cap_funwrap_mmap() unwrap capabilities, exposing the
underlying object. Attempting to unwrap a capability with an inadequate
rights mask (e.g. calling cap_funwrap(fp, CAP_WRITE | CAP_MMAP, &result)
on a capability whose rights mask is CAP_READ | CAP_MMAP) will result in
ENOTCAPABLE.
Unwrapping a non-capability is effectively a no-op.
These functions will be used by Capsicum-aware versions of _fget(), etc.
Approved by: mentor (rwatson), re (Capsicum blanket)
Sponsored by: Google Inc
to do with global namespaces) and CAPABILITIES (which has to do with
constraining file descriptors). Just in case, and because it's a better
name anyway, let's move CAPABILITIES out of the way.
Also, change opt_capabilities.h to opt_capsicum.h; for now, this will
only hold CAPABILITY_MODE, but it will probably also hold the new
CAPABILITIES (implying constrained file descriptors) in the future.
Approved by: rwatson
Sponsored by: Google UK Ltd
compiled conditionally on options CAPABILITIES:
Add a new credential flag, CRED_FLAG_CAPMODE, which indicates that a
subject (typically a process) is in capability mode.
Add two new system calls, cap_enter(2) and cap_getmode(2), which allow
setting and querying (but never clearing) the flag.
Export the capability mode flag via process information sysctls.
Sponsored by: Google, Inc.
Reviewed by: anderson
Discussed with: benl, kris, pjd
Obtained from: Capsicum Project
MFC after: 3 months
