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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "chattr-util.h"
#include "errno-util.h"
#include "fd-util.h"
#include "fs-util.h"
#include "fsprg.h"
#include "hostname-util.h"
#include "io-util.h"
#include "journal-authenticate.h"
#include "journalctl.h"
#include "journalctl-authenticate.h"
#include "memstream-util.h"
#include "path-util.h"
#include "qrcode-util.h"
#include "random-util.h"
#include "stat-util.h"
#include "terminal-util.h"
#include "tmpfile-util.h"
static int format_key(
const void *seed,
size_t seed_size,
uint64_t start,
uint64_t interval,
char **ret) {
_cleanup_(memstream_done) MemStream m = {};
FILE *f;
assert(seed);
assert(seed_size > 0);
assert(ret);
f = memstream_init(&m);
if (!f)
return -ENOMEM;
for (size_t i = 0; i < seed_size; i++) {
if (i > 0 && i % 3 == 0)
fputc('-', f);
fprintf(f, "%02x", ((uint8_t*) seed)[i]);
}
fprintf(f, "/%"PRIx64"-%"PRIx64, start, interval);
return memstream_finalize(&m, ret, NULL);
}
int action_setup_keys(void) {
_cleanup_(unlink_and_freep) char *tmpfile = NULL;
_cleanup_close_ int fd = -EBADF;
_cleanup_free_ char *path = NULL;
size_t mpk_size, seed_size, state_size;
uint8_t *mpk, *seed, *state;
sd_id128_t machine, boot;
uint64_t n;
int r;
assert(arg_action == ACTION_SETUP_KEYS);
r = is_dir("/var/log/journal/", /* follow = */ false);
if (r == 0)
return log_error_errno(SYNTHETIC_ERRNO(ENOTDIR),
"/var/log/journal is not a directory, must be using persistent logging for FSS.");
if (r == -ENOENT)
return log_error_errno(r, "Directory /var/log/journal/ does not exist, must be using persistent logging for FSS.");
if (r < 0)
return log_error_errno(r, "Failed to check if /var/log/journal/ is a directory: %m");
r = sd_id128_get_machine(&machine);
if (r < 0)
return log_error_errno(r, "Failed to get machine ID: %m");
r = sd_id128_get_boot(&boot);
if (r < 0)
return log_error_errno(r, "Failed to get boot ID: %m");
path = path_join("/var/log/journal/", SD_ID128_TO_STRING(machine), "/fss");
if (!path)
return log_oom();
if (arg_force) {
if (unlink(path) < 0 && errno != ENOENT)
return log_error_errno(errno, "Failed to remove \"%s\": %m", path);
} else if (access(path, F_OK) >= 0)
return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
"Sealing key file %s exists already. Use --force to recreate.", path);
mpk_size = FSPRG_mskinbytes(FSPRG_RECOMMENDED_SECPAR);
mpk = alloca_safe(mpk_size);
seed_size = FSPRG_RECOMMENDED_SEEDLEN;
seed = alloca_safe(seed_size);
state_size = FSPRG_stateinbytes(FSPRG_RECOMMENDED_SECPAR);
state = alloca_safe(state_size);
log_info("Generating seed...");
r = crypto_random_bytes(seed, seed_size);
if (r < 0)
return log_error_errno(r, "Failed to acquire random seed: %m");
log_info("Generating key pair...");
r = FSPRG_GenMK(NULL, mpk, seed, seed_size, FSPRG_RECOMMENDED_SECPAR);
if (r < 0)
return log_error_errno(r, "Failed to generate key pair: %m");
log_info("Generating sealing key...");
r = FSPRG_GenState0(state, mpk, seed, seed_size);
if (r < 0)
return log_error_errno(r, "Failed to generate sealing key: %m");
assert(arg_interval > 0);
n = now(CLOCK_REALTIME);
n /= arg_interval;
fd = open_tmpfile_linkable(path, O_WRONLY|O_CLOEXEC, &tmpfile);
if (fd < 0)
return log_error_errno(fd, "Failed to open a temporary file for %s: %m", path);
r = chattr_secret(fd, CHATTR_WARN_UNSUPPORTED_FLAGS);
if (r < 0)
log_full_errno(ERRNO_IS_NOT_SUPPORTED(r) ? LOG_DEBUG : LOG_WARNING,
r, "Failed to set file attributes on a temporary file for '%s', ignoring: %m", path);
struct FSSHeader h = {
.signature = { 'K', 'S', 'H', 'H', 'R', 'H', 'L', 'P' },
.machine_id = machine,
.boot_id = boot,
.header_size = htole64(sizeof(h)),
.start_usec = htole64(n * arg_interval),
.interval_usec = htole64(arg_interval),
.fsprg_secpar = htole16(FSPRG_RECOMMENDED_SECPAR),
.fsprg_state_size = htole64(state_size),
};
r = loop_write(fd, &h, sizeof(h));
if (r < 0)
return log_error_errno(r, "Failed to write header: %m");
r = loop_write(fd, state, state_size);
if (r < 0)
return log_error_errno(r, "Failed to write state: %m");
r = link_tmpfile(fd, tmpfile, path, /* flags = */ 0);
if (r < 0)
return log_error_errno(r, "Failed to link file: %m");
tmpfile = mfree(tmpfile);
_cleanup_free_ char *key = NULL;
r = format_key(seed, seed_size, n, arg_interval, &key);
if (r < 0)
return r;
if (!on_tty()) {
/* If we are not on a TTY, show only the key. */
puts(key);
return 0;
}
_cleanup_free_ char *hn = NULL;
hn = gethostname_malloc();
if (hn)
hostname_cleanup(hn);
fprintf(stderr,
"\nNew keys have been generated for host %s%s" SD_ID128_FORMAT_STR ".\n"
"\n"
"The %ssecret sealing key%s has been written to the following local file.\n"
"This key file is automatically updated when the sealing key is advanced.\n"
"It should not be used on multiple hosts.\n"
"\n"
"\t%s\n"
"\n"
"The sealing key is automatically changed every %s.\n"
"\n"
"Please write down the following %ssecret verification key%s. It should be stored\n"
"in a safe location and should not be saved locally on disk.\n"
"\n\t%s",
strempty(hn), hn ? "/" : "",
SD_ID128_FORMAT_VAL(machine),
ansi_highlight(), ansi_normal(),
path,
FORMAT_TIMESPAN(arg_interval, 0),
ansi_highlight(), ansi_normal(),
ansi_highlight_red());
fflush(stderr);
puts(key);
fputs(ansi_normal(), stderr);
#if HAVE_QRENCODE
_cleanup_free_ char *url = NULL;
url = strjoin("fss://", key, "?machine=", SD_ID128_TO_STRING(machine), hn ? ";hostname=" : "", hn);
if (!url)
return log_oom();
(void) print_qrcode(stderr,
"To transfer the verification key to your phone scan the QR code below",
url);
#endif
return 0;
}
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