bsdcapsicum.rb/lib/bsd/capsicum.rb

68 lines
2.1 KiB
Ruby

# frozen_string_literal: true
module BSD
end unless defined?(BSD)
module BSD::Capsicum
require_relative "capsicum/version"
require_relative "capsicum/constants"
require_relative "capsicum/ffi"
extend self
##
# Check if we're in capability mode
#
# @see https://man.freebsd.org/cgi/man.cgi?query=cap_getmode&apropos=0&sektion=2&format=html cap_getmode(2)
# @raise [SystemCallError]
# Might raise a subclass of SystemCallError
# @return [Boolean]
# Returns true when the current process is in capability mode
def in_capability_mode?
uintp = Fiddle::Pointer.malloc(Fiddle::SIZEOF_UINT)
if FFI.cap_getmode(uintp).zero?
uintp[0, Fiddle::SIZEOF_UINT].unpack("i") == [1]
else
raise SystemCallError.new("cap_getmode", Fiddle.last_error)
end
ensure
uintp.call_free
end
alias_method :capability_mode?, :in_capability_mode?
##
# Enter a process into capability mode
#
# @see https://man.freebsd.org/cgi/man.cgi?query=cap_enter&apropos=0&sektion=2&format=html cap_enter(2)
# @raise [SystemCallError]
# Might raise a subclass of SystemCallError
# @return [Boolean]
# Returns true when successful
def enter!
FFI.cap_enter.zero? ||
raise(SystemCallError.new("cap_enter", Fiddle.last_error))
end
alias_method :enter_capability_mode!, :enter!
##
# Restrict the capabilities of a file descriptor
#
# @see https://man.freebsd.org/cgi/man.cgi?query=cap_rights_limit&apropos=0&sektion=2&format=html cap_rights_limit(2)
# @example
# # Allow: READ, WRITE on standard output
# BSD::Capsicum.set_rights!(STDOUT, [:CAP_READ, :CAP_WRITE])
# @raise [SystemCallError]
# Might raise a subclass of SystemCallError
# @param [#to_i] io
# An IO object
# @param [Array<String>] rights
# An allowed set of capabilities
# @return [Boolean]
# Returns true when successful
def set_rights!(io, rights)
voidp = FFI.cap_rights_init(*rights)
FFI.cap_rights_limit(io.to_i, voidp).zero? ||
raise(SystemCallError.new("cap_rights_limit", Fiddle.last_error))
ensure
voidp.call_free
end
end