static int write_what(FILE *f, const char *what) {
_cleanup_free_ char *w = NULL;
w = specifier_escape(what);
if (!w)
return log_oom();
fprintf(f, "What=%s\n", w);
return 1;
}
static int write_fsck_sysroot_service(const char *dir, const char *what) {
_cleanup_free_ char *device = NULL, *escaped = NULL, *escaped2 = NULL;
_cleanup_fclose_ FILE *f = NULL;
const char *unit;
int r;
escaped = specifier_escape(what);
if (!escaped)
return log_oom();
escaped2 = cescape(escaped);
if (!escaped2)
return log_oom();
unit = strjoina(dir, "/systemd-fsck-root.service");
log_debug("Creating %s", unit);
r = unit_name_from_path(what, ".device", &device);
if (r < 0)
return log_error_errno(r, "Failed to convert device \"%s\" to unit name: %m", what);
f = fopen(unit, "wxe");
if (!f)
return log_error_errno(errno, "Failed to create unit file %s: %m", unit);
fprintf(f,
"# Automatically generated by %1$s\n\n"
"[Unit]\n"
"Description=File System Check on %2$s\n"
"Documentation=man:systemd-fsck-root.service(8)\n"
"DefaultDependencies=no\n"
"BindsTo=%3$s\n"
"After=initrd-root-device.target local-fs-pre.target %3$s\n"
"Before=shutdown.target\n"
"\n"
"[Service]\n"
"Type=oneshot\n"
"RemainAfterExit=yes\n"
"ExecStart=" SYSTEMD_FSCK_PATH " %4$s\n"
"TimeoutSec=0\n",
program_invocation_short_name,
escaped,
device,
escaped2);
r = fflush_and_check(f);
if (r < 0)
return log_error_errno(r, "Failed to write unit file %s: %m", unit);
return 0;
}
static int write_options(FILE *f, const char *options) {
_cleanup_free_ char *o = NULL;
if (isempty(options))
return 0;
if (streq(options, "defaults"))
return 0;
o = specifier_escape(options);
if (!o)
return log_oom();
fprintf(f, "Options=%s\n", o);
return 1;
}
static void test_specifier_escape_one(const char *a, const char *b) {
_cleanup_free_ char *x = NULL;
x = specifier_escape(a);
assert_se(streq_ptr(x, b));
}
static int create_device(void) {
_cleanup_free_ char *u = NULL, *v = NULL, *d = NULL, *e = NULL, *u_escaped = NULL, *v_escaped = NULL, *root_hash_escaped = NULL;
_cleanup_fclose_ FILE *f = NULL;
const char *to;
int r;
/* If all three pieces of information are missing, then verity is turned off */
if (!arg_root_hash && !arg_data_what && !arg_hash_what)
return 0;
/* if one of them is missing however, the data is simply incomplete and this is an error */
if (!arg_root_hash)
log_error("Verity information incomplete, root hash unspecified.");
if (!arg_data_what)
log_error("Verity information incomplete, root data device unspecified.");
if (!arg_hash_what)
log_error("Verity information incomplete, root hash device unspecified.");
if (!arg_root_hash || !arg_data_what || !arg_hash_what)
return -EINVAL;
log_debug("Using root verity data device %s,\n"
" hash device %s,\n"
" and root hash %s.", arg_data_what, arg_hash_what, arg_root_hash);
u = fstab_node_to_udev_node(arg_data_what);
if (!u)
return log_oom();
v = fstab_node_to_udev_node(arg_hash_what);
if (!v)
return log_oom();
u_escaped = specifier_escape(u);
if (!u_escaped)
return log_oom();
v_escaped = specifier_escape(v);
if (!v_escaped)
return log_oom();
r = unit_name_from_path(u, ".device", &d);
if (r < 0)
return log_error_errno(r, "Failed to generate unit name: %m");
r = unit_name_from_path(v, ".device", &e);
if (r < 0)
return log_error_errno(r, "Failed to generate unit name: %m");
root_hash_escaped = specifier_escape(arg_root_hash);
if (!root_hash_escaped)
return log_oom();
r = generator_open_unit_file(arg_dest, NULL, SYSTEMD_VERITYSETUP_SERVICE, &f);
if (r < 0)
return r;
fprintf(f,
"[Unit]\n"
"Description=Integrity Protection Setup for %%I\n"
"Documentation=man:systemd-veritysetup-generator(8) man:[email protected](8)\n"
"SourcePath=/proc/cmdline\n"
"DefaultDependencies=no\n"
"Conflicts=umount.target\n"
"BindsTo=%s %s\n"
"IgnoreOnIsolate=true\n"
"After=cryptsetup-pre.target %s %s\n"
"Before=cryptsetup.target umount.target\n"
"\n[Service]\n"
"Type=oneshot\n"
"RemainAfterExit=yes\n"
"ExecStart=" ROOTLIBEXECDIR "/systemd-veritysetup attach root '%s' '%s' '%s'\n"
"ExecStop=" ROOTLIBEXECDIR "/systemd-veritysetup detach root\n",
d, e,
d, e,
u_escaped, v_escaped, root_hash_escaped);
r = fflush_and_check(f);
if (r < 0)
return log_error_errno(r, "Failed to write file unit "SYSTEMD_VERITYSETUP_SERVICE": %m");
to = strjoina(arg_dest, "/cryptsetup.target.requires/" SYSTEMD_VERITYSETUP_SERVICE);
(void) mkdir_parents(to, 0755);
if (symlink("../" SYSTEMD_VERITYSETUP_SERVICE, to) < 0)
return log_error_errno(errno, "Failed to create symlink %s: %m", to);
return 0;
}
static int create_disk(
const char *name,
const char *device,
const char *password,
const char *options) {
_cleanup_free_ char *p = NULL, *n = NULL, *d = NULL, *u = NULL, *e = NULL,
*filtered = NULL, *u_escaped = NULL, *password_escaped = NULL, *filtered_escaped = NULL, *name_escaped = NULL;
_cleanup_fclose_ FILE *f = NULL;
const char *dmname;
bool noauto, nofail, tmp, swap, netdev;
int r;
assert(name);
assert(device);
noauto = fstab_test_yes_no_option(options, "noauto\0" "auto\0");
nofail = fstab_test_yes_no_option(options, "nofail\0" "fail\0");
tmp = fstab_test_option(options, "tmp\0");
swap = fstab_test_option(options, "swap\0");
netdev = fstab_test_option(options, "_netdev\0");
if (tmp && swap) {
log_error("Device '%s' cannot be both 'tmp' and 'swap'. Ignoring.", name);
return -EINVAL;
}
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-cryptsetup", e, ".service", &n);
if (r < 0)
return log_error_errno(r, "Failed to generate unit name: %m");
p = strjoin(arg_dest, "/", n);
if (!p)
return log_oom();
u = fstab_node_to_udev_node(device);
if (!u)
return log_oom();
u_escaped = specifier_escape(u);
if (!u_escaped)
return log_oom();
r = unit_name_from_path(u, ".device", &d);
if (r < 0)
return log_error_errno(r, "Failed to generate unit name: %m");
password_escaped = specifier_escape(password);
if (!password_escaped)
return log_oom();
f = fopen(p, "wxe");
if (!f)
return log_error_errno(errno, "Failed to create unit file %s: %m", p);
fprintf(f,
"# Automatically generated by systemd-cryptsetup-generator\n\n"
"[Unit]\n"
"Description=Cryptography Setup for %%I\n"
"Documentation=man:crypttab(5) man:systemd-cryptsetup-generator(8) man:[email protected](8)\n"
"SourcePath=/etc/crypttab\n"
"DefaultDependencies=no\n"
"Conflicts=umount.target\n"
"IgnoreOnIsolate=true\n"
"After=%s\n",
netdev ? "remote-fs-pre.target" : "cryptsetup-pre.target");
if (!nofail)
fprintf(f,
"Before=%s\n",
netdev ? "remote-cryptsetup.target" : "cryptsetup.target");
if (password) {
if (STR_IN_SET(password, "/dev/urandom", "/dev/random", "/dev/hw_random"))
fputs_unlocked("After=systemd-random-seed.service\n", f);
else if (!STR_IN_SET(password, "-", "none")) {
_cleanup_free_ char *uu;
uu = fstab_node_to_udev_node(password);
if (!uu)
return log_oom();
if (!path_equal(uu, "/dev/null")) {
if (path_startswith(uu, "/dev/")) {
_cleanup_free_ char *dd = NULL;
r = unit_name_from_path(uu, ".device", &dd);
if (r < 0)
return log_error_errno(r, "Failed to generate unit name: %m");
fprintf(f, "After=%1$s\nRequires=%1$s\n", dd);
} else
fprintf(f, "RequiresMountsFor=%s\n", password_escaped);
}
}
}
if (path_startswith(u, "/dev/")) {
fprintf(f,
"BindsTo=%s\n"
"After=%s\n"
"Before=umount.target\n",
d, d);
if (swap)
fputs_unlocked("Before=dev-mapper-%i.swap\n",
f);
} else
fprintf(f,
"RequiresMountsFor=%s\n",
u_escaped);
r = generator_write_timeouts(arg_dest, device, name, options, &filtered);
if (r < 0)
return r;
filtered_escaped = specifier_escape(filtered);
if (!filtered_escaped)
return log_oom();
fprintf(f,
"\n[Service]\n"
"Type=oneshot\n"
"RemainAfterExit=yes\n"
"TimeoutSec=0\n" /* the binary handles timeouts anyway */
"KeyringMode=shared\n" /* make sure we can share cached keys among instances */
"ExecStart=" SYSTEMD_CRYPTSETUP_PATH " attach '%s' '%s' '%s' '%s'\n"
"ExecStop=" SYSTEMD_CRYPTSETUP_PATH " detach '%s'\n",
name_escaped, u_escaped, strempty(password_escaped), strempty(filtered_escaped),
name_escaped);
if (tmp)
fprintf(f,
"ExecStartPost=/sbin/mke2fs '/dev/mapper/%s'\n",
name_escaped);
if (swap)
fprintf(f,
"ExecStartPost=/sbin/mkswap '/dev/mapper/%s'\n",
name_escaped);
r = fflush_and_check(f);
if (r < 0)
return log_error_errno(r, "Failed to write file %s: %m", p);
if (!noauto) {
r = generator_add_symlink(arg_dest, d, "wants", n);
if (r < 0)
return r;
r = generator_add_symlink(arg_dest,
netdev ? "remote-cryptsetup.target" : "cryptsetup.target",
nofail ? "wants" : "requires", n);
if (r < 0)
return r;
}
dmname = strjoina("dev-mapper-", e, ".device");
r = generator_add_symlink(arg_dest, dmname, "requires", n);
if (r < 0)
return r;
if (!noauto && !nofail) {
r = write_drop_in(arg_dest, dmname, 90, "device-timeout",
"# Automatically generated by systemd-cryptsetup-generator \n\n"
"[Unit]\nJobTimeoutSec=0");
if (r < 0)
return log_error_errno(r, "Failed to write device drop-in: %m");
}
return 0;
}
