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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <stdbool.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <unistd.h>
#include "alloc-util.h"
#include "fd-util.h"
#include "fileio.h"
#include "fstab-util.h"
#include "generator.h"
#include "hexdecoct.h"
#include "id128-util.h"
#include "integrity-util.h"
#include "main-func.h"
#include "mkdir.h"
#include "parse-util.h"
#include "path-util.h"
#include "proc-cmdline.h"
#include "specifier.h"
#include "string-util.h"
#include "unit-name.h"
static const char *arg_dest = NULL;
static const char *arg_integritytab = NULL;
static char *arg_options = NULL;
STATIC_DESTRUCTOR_REGISTER(arg_options, freep);
static int create_disk(
const char *name,
const char *device,
const char *key_file,
const char *options) {
_cleanup_free_ char *n = NULL, *dd = NULL, *e = NULL, *name_escaped = NULL, *key_file_escaped = NULL;
_cleanup_fclose_ FILE *f = NULL;
int r;
char *dmname = NULL;
assert(name);
assert(device);
name_escaped = specifier_escape(name);
if (!name_escaped)
return log_oom();
e = unit_name_escape(name);
if (!e)
return log_oom();
r = unit_name_build("systemd-integritysetup", e, ".service", &n);
if (r < 0)
return log_error_errno(r, "Failed to generate unit name: %m");
r = unit_name_from_path(device, ".device", &dd);
if (r < 0)
return log_error_errno(r, "Failed to generate unit name: %m");
r = generator_open_unit_file(arg_dest, NULL, n, &f);
if (r < 0)
return r;
if (key_file) {
if (!path_is_absolute(key_file))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "key file not absolute file path %s", key_file);
key_file_escaped = specifier_escape(key_file);
if (!key_file_escaped)
return log_oom();
}
if (options) {
r = parse_integrity_options(options, NULL, NULL, NULL, NULL, NULL);
if (r < 0)
return r;
}
fprintf(f,
"[Unit]\n"
"Description=Integrity Setup for %%I\n"
"Documentation=man:integritytab(5) man:systemd-integritysetup-generator(8) man:systemd-integritysetup@.service(8)\n"
"SourcePath=%s\n"
"DefaultDependencies=no\n"
"IgnoreOnIsolate=true\n"
"After=integritysetup-pre.target systemd-udevd-kernel.socket\n"
"Before=blockdev@dev-mapper-%%i.target\n"
"Wants=blockdev@dev-mapper-%%i.target\n"
"Conflicts=umount.target\n"
"Before=integritysetup.target\n"
"BindsTo=%s\n"
"After=%s\n"
"Before=umount.target\n",
arg_integritytab,
dd, dd);
fprintf(f,
"\n"
"[Service]\n"
"Type=oneshot\n"
"RemainAfterExit=yes\n"
"TimeoutSec=infinity\n"
"ExecStart=" LIBEXECDIR "/systemd-integritysetup attach '%s' '%s' '%s' '%s'\n"
"ExecStop=" LIBEXECDIR "/systemd-integritysetup detach '%s'\n",
name_escaped, device, empty_to_dash(key_file_escaped), empty_to_dash(options),
name_escaped);
r = fflush_and_check(f);
if (r < 0)
return log_error_errno(r, "Failed to write unit file %s: %m", n);
r = generator_add_symlink(arg_dest, "integritysetup.target", "requires", n);
if (r < 0)
return r;
dmname = strjoina("dev-mapper-", e, ".device");
return generator_add_symlink(arg_dest, dmname, "requires", n);
}
static int add_integritytab_devices(void) {
_cleanup_fclose_ FILE *f = NULL;
unsigned integritytab_line = 0;
int r;
r = fopen_unlocked(arg_integritytab, "re", &f);
if (r < 0) {
if (errno != ENOENT)
log_error_errno(errno, "Failed to open %s: %m", arg_integritytab);
return 0;
}
for (;;) {
_cleanup_free_ char *line = NULL, *name = NULL, *device_id = NULL, *device_path = NULL, *key_file = NULL, *options = NULL;
r = read_stripped_line(f, LONG_LINE_MAX, &line);
if (r < 0)
return log_error_errno(r, "Failed to read %s: %m", arg_integritytab);
if (r == 0)
break;
integritytab_line++;
if (IN_SET(line[0], 0, '#'))
continue;
/* The key file and the options are optional */
r = sscanf(line, "%ms %ms %ms %ms", &name, &device_id, &key_file, &options);
if (!IN_SET(r, 2, 3, 4)) {
log_error("Failed to parse %s:%u, ignoring.", arg_integritytab, integritytab_line);
continue;
}
device_path = fstab_node_to_udev_node(device_id);
if (!device_path) {
log_error("Failed to find device %s:%u, ignoring.", device_id, integritytab_line);
continue;
}
r = create_disk(name, device_path, empty_or_dash_to_null(key_file), empty_or_dash_to_null(options));
if (r < 0)
return r;
}
return 0;
}
static int run(const char *dest, const char *dest_early, const char *dest_late) {
assert_se(arg_dest = dest);
arg_integritytab = getenv("SYSTEMD_INTEGRITYTAB") ?: "/etc/integritytab";
return add_integritytab_devices();
}
DEFINE_MAIN_GENERATOR_FUNCTION(run);
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