b0fc16bfc7
Name the flag exactly as it's used by LUKS everywhere: allow_discards (we had in some places "discard", "allow_discard"). Implement actually honoring that flag if it's set. Untested code.
89 lines
2.4 KiB
C
89 lines
2.4 KiB
C
/*
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luksrku - Tool to remotely unlock LUKS disks using TLS.
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Copyright (C) 2016-2019 Johannes Bauer
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This file is part of luksrku.
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luksrku 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; this program is ONLY licensed under
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version 3 of the License, later versions are explicitly excluded.
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luksrku 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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You should have received a copy of the GNU General Public License
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along with luksrku; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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Johannes Bauer <JohannesBauer@gmx.de>
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*/
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#include <stdio.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include "luks.h"
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#include "log.h"
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#include "exec.h"
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#include "util.h"
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#include "uuid.h"
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bool is_luks_device_opened(const char *mapping_name) {
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struct exec_cmd_t cmd = {
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.argv = (const char *[]){
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"dmsetup",
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"status",
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mapping_name,
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NULL,
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},
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.show_output = should_log(LLVL_TRACE),
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};
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struct exec_result_t runresult = exec_command(&cmd);
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return runresult.success && (runresult.returncode == 0);
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}
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bool open_luks_device(const uint8_t *encrypted_device_uuid, const char *mapping_name, const char *passphrase, unsigned int passphrase_length, bool allow_discards) {
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char encrypted_device[64];
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strcpy(encrypted_device, "UUID=");
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sprintf_uuid(encrypted_device + 5, encrypted_device_uuid);
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log_msg(LLVL_INFO, "Trying to unlock LUKS mapping %s based on %s", mapping_name, encrypted_device);
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struct exec_cmd_t cmd = {
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.stdin_data = passphrase,
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.stdin_length = passphrase_length,
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.show_output = should_log(LLVL_DEBUG),
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};
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if (!allow_discards) {
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cmd.argv = (const char *[]) {
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"cryptsetup",
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"luksOpen",
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"-T", "1",
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encrypted_device,
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mapping_name,
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NULL,
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};
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} else {
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cmd.argv = (const char *[]) {
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"cryptsetup",
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"--allow-discards",
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"luksOpen",
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"-T", "1",
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encrypted_device,
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mapping_name,
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NULL,
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};
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}
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struct exec_result_t runresult = exec_command(&cmd);
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return runresult.success && (runresult.returncode == 0);
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}
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