80 lines
1.7 KiB
Ruby
80 lines
1.7 KiB
Ruby
# frozen_string_literal: true
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require "capsicum/version"
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require "fiddle"
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module Capsicum
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# @api private
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module LibC
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module_function
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##
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# Provides a Ruby interface for cap_enter(2)
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# @return [Integer]
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def cap_enter
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Fiddle::Function.new(
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libc["cap_enter"],
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[],
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Fiddle::Types::INT
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).call
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end
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##
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# Provides a Ruby interface for cap_getmode(2)
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# @param [Fiddle::Pointer] uintp
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# @return [Integer]
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def cap_getmode(uintp)
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Fiddle::Function.new(
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libc["cap_getmode"],
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[Fiddle::Types::INTPTR_T],
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Fiddle::Types::INT
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).call(uintp)
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end
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##
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# @api private
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def libc
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@libc ||= Fiddle.dlopen Dir["/lib/libc.*"].first
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end
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end
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module_function
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##
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# Check if we're in capability mode.
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#
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# @see cap_getmode(2)
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# @raise [SystemCallError]
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# Might raise a subclass of SystemCallError
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# @return [Boolean]
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# Returns true if the current process is in capability mode
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def sandboxed?
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uintp = Fiddle::Pointer.malloc(Fiddle::SIZEOF_UINT)
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ret = LibC.cap_getmode(uintp)
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if ret == 0
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uintp[0, Fiddle::SIZEOF_UINT].unpack("i") == [1]
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else
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raise SystemCallError.new("cap_getmode", Fiddle.last_error)
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end
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ensure
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uintp.call_free
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end
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alias_method :capability_mode?, :sandboxed?
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##
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# Enter capability mode
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#
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# @see cap_enter(2)
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# @raise [SystemCallError]
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# Might raise a subclass of SystemCallError
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# @return [Boolean]
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# Returns true when the current process is in capability mode
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def enter!
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if LibC.cap_enter == 0
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true
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else
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raise SystemCallError.new("cap_enter", Fiddle.last_error)
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end
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end
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end
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