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80 lines
2.8 KiB
OCaml
80 lines
2.8 KiB
OCaml
(* guestfs-inspection
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* Copyright (C) 2009-2025 Red Hat Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*)
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open Printf
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open Unix
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open Std_utils
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open Utils
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let cryptsetup_open ?(readonly = false) ?crypttype ?cipher device key mapname =
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(* Sanity check: /dev/mapper/mapname must not exist already. Note
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* that the device-mapper control device (/dev/mapper/control) is
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* always there, so you can't ever have mapname == "control".
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*)
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let devmapper = sprintf "/dev/mapper/%s" mapname in
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if is_block_device devmapper then
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failwithf "%s: device already exists" devmapper;
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(* Heuristically determine the encryption type. *)
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let crypttype =
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match crypttype with
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| Some s -> s
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| None ->
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let t = Blkid.vfs_type (Mountable.of_device device) in
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match t with
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| "crypto_LUKS" -> "luks"
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| "BitLocker" -> "bitlk"
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| _ ->
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failwithf "%s: unknown encrypted device type" t in
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(* Write the key to a temporary file. *)
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let keyfile, chan = Filename.open_temp_file "crypt" ".key" in
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output_string chan key;
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close_out chan;
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let args = ref [] in
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List.push_back_list args ["-d"; keyfile];
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if readonly then List.push_back args "--readonly";
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List.push_back_list args ["open"; device; mapname; "--type"; crypttype];
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Option.iter (fun s -> List.push_back_list args ["--cipher"; s]) cipher;
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(* Make sure we always remove the temporary file. *)
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protect ~f:(fun () -> ignore (command "cryptsetup" !args))
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~finally:(fun () -> unlink keyfile);
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udev_settle ()
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let cryptsetup_close device =
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(* Must be /dev/mapper/... *)
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if not (String.is_prefix device "/dev/mapper/") then
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failwithf "%s: you must call this on the /dev/mapper device created by cryptsetup-open" device;
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let mapname = String.sub device 12 (String.length device - 12) in
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ignore (command "cryptsetup" ["close"; mapname]);
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udev_settle ()
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(* Deprecated APIs for backwards compatibility. *)
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let luks_open device key mapname =
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cryptsetup_open ~crypttype:"luks" device key mapname
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let luks_open_ro device key mapname =
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cryptsetup_open ~crypttype:"luks" ~readonly:true device key mapname
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let luks_close = cryptsetup_close
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