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/*
* Helper utilities for LUKS2 features
*
* Copyright (C) 2018-2021 Red Hat, Inc. All rights reserved.
* Copyright (C) 2018-2021 Milan Broz
* Copyright (C) 2018-2021 Ondrej Kozina
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "cryptsetup.h"
/*
* FIXME: 4MiBs is max LUKS2 mda length (including binary header).
* In future, read max allowed JSON size from config section.
*/
#define LUKS2_MAX_MDA_SIZE 0x400000
int tools_read_json_file(struct crypt_device *cd, const char *file, char **json, size_t *json_size)
{
ssize_t ret;
int fd, block, r;
void *buf = NULL;
block = tools_signals_blocked();
if (block)
set_int_block(0);
if (tools_is_stdin(file)) {
fd = STDIN_FILENO;
log_dbg("STDIN descriptor JSON read requested.");
} else {
log_dbg("File descriptor JSON read requested.");
fd = open(file, O_RDONLY);
if (fd < 0) {
log_err(_("Failed to open file %s in read-only mode."), file);
r = -EINVAL;
goto out;
}
}
buf = malloc(LUKS2_MAX_MDA_SIZE);
if (!buf) {
r = -ENOMEM;
goto out;
}
if (isatty(fd) && !opt_batch_mode)
log_std(_("Provide valid LUKS2 token JSON:\n"));
/* we expect JSON (string) */
r = 0;
ret = read_buffer_intr(fd, buf, LUKS2_MAX_MDA_SIZE - 1, &quit);
if (ret < 0) {
r = -EIO;
log_err(_("Failed to read JSON file."));
goto out;
}
check_signal(&r);
if (r) {
log_err(_("\nRead interrupted."));
goto out;
}
*json_size = (size_t)ret;
*json = buf;
*(*json + ret) = '\0';
out:
if (block && !quit)
set_int_block(1);
if (fd >= 0 && fd != STDIN_FILENO)
close(fd);
if (r && buf) {
memset(buf, 0, LUKS2_MAX_MDA_SIZE);
free(buf);
}
return r;
}
int tools_write_json_file(struct crypt_device *cd, const char *file, const char *json)
{
int block, fd, r;
size_t json_len;
ssize_t ret;
if (!json || !(json_len = strlen(json)) || json_len >= LUKS2_MAX_MDA_SIZE)
return -EINVAL;
block = tools_signals_blocked();
if (block)
set_int_block(0);
if (tools_is_stdin(file)) {
fd = STDOUT_FILENO;
log_dbg("STDOUT descriptor JSON write requested.");
} else {
log_dbg("File descriptor JSON write requested.");
fd = open(file, O_CREAT | O_WRONLY, S_IRUSR | S_IWUSR);
}
if (fd < 0) {
log_err(_("Failed to open file %s in write mode."), file ?: "");
r = -EINVAL;
goto out;
}
r = 0;
ret = write_buffer_intr(fd, json, json_len, &quit);
check_signal(&r);
if (r) {
log_err(_("\nWrite interrupted."));
goto out;
}
if (ret < 0 || (size_t)ret != json_len) {
log_err(_("Failed to write JSON file."));
r = -EIO;
goto out;
}
if (isatty(fd))
(void) write_buffer_intr(fd, "\n", 1, &quit);
out:
if (block && !quit)
set_int_block(1);
if (fd >=0 && fd != STDOUT_FILENO)
close(fd);
return r;
}
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