693 lines
23 KiB
C
693 lines
23 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include "alloc-util.h"
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#include "dropin.h"
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#include "escape.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "fstab-util.h"
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#include "generator.h"
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#include "hashmap.h"
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#include "id128-util.h"
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#include "log.h"
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#include "mkdir.h"
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#include "parse-util.h"
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#include "path-util.h"
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#include "proc-cmdline.h"
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#include "specifier.h"
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#include "string-util.h"
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#include "strv.h"
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#include "unit-name.h"
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#include "util.h"
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typedef struct crypto_device {
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char *uuid;
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char *keyfile;
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char *keydev;
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char *name;
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char *options;
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bool create;
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} crypto_device;
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static const char *arg_dest = NULL;
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static bool arg_enabled = true;
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static bool arg_read_crypttab = true;
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static const char *arg_crypttab = NULL;
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static const char *arg_runtime_directory = NULL;
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static bool arg_whitelist = false;
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static Hashmap *arg_disks = NULL;
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static char *arg_default_options = NULL;
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static char *arg_default_keyfile = NULL;
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STATIC_DESTRUCTOR_REGISTER(arg_disks, hashmap_freep);
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STATIC_DESTRUCTOR_REGISTER(arg_default_options, freep);
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STATIC_DESTRUCTOR_REGISTER(arg_default_keyfile, freep);
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static int split_keyspec(const char *keyspec, char **ret_keyfile, char **ret_keydev) {
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_cleanup_free_ char *keyfile = NULL, *keydev = NULL;
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const char *c;
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assert(ret_keyfile);
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assert(ret_keydev);
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if (!keyspec) {
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*ret_keyfile = *ret_keydev = NULL;
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return 0;
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}
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c = strrchr(keyspec, ':');
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if (c) {
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/* The keydev part has to be either an absolute path to device node (/dev/something,
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* /dev/foo/something, or even possibly /dev/foo/something:part), or a fstab device
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* specification starting with LABEL= or similar. The keyfile part has the same syntax.
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*
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* Let's try to guess if the second part looks like a keydev specification, or just part of a
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* filename with a colon. fstab_node_to_udev_node() will convert the fstab device syntax to
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* an absolute path. If we didn't get an absolute path, assume that it is just part of the
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* first keyfile argument. */
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keydev = fstab_node_to_udev_node(c + 1);
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if (!keydev)
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return log_oom();
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if (path_is_absolute(keydev))
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keyfile = strndup(keyspec, c-keyspec);
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else {
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log_debug("Keyspec argument contains a colon, but \"%s\" doesn't look like a device specification.\n"
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"Assuming that \"%s\" is a single device specification.",
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c + 1, keyspec);
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keydev = mfree(keydev);
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c = NULL;
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}
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}
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if (!c)
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/* No keydev specified */
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keyfile = strdup(keyspec);
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if (!keyfile)
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return log_oom();
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*ret_keyfile = TAKE_PTR(keyfile);
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*ret_keydev = TAKE_PTR(keydev);
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return 0;
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}
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static int generate_keydev_mount(
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const char *name,
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const char *keydev,
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const char *keydev_timeout,
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bool canfail,
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char **unit,
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char **mount) {
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_cleanup_free_ char *u = NULL, *where = NULL, *name_escaped = NULL, *device_unit = NULL;
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_cleanup_fclose_ FILE *f = NULL;
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int r;
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usec_t timeout_us;
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assert(name);
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assert(keydev);
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assert(unit);
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assert(mount);
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r = mkdir_parents(arg_runtime_directory, 0755);
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if (r < 0)
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return r;
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r = mkdir(arg_runtime_directory, 0700);
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if (r < 0 && errno != EEXIST)
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return -errno;
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name_escaped = cescape(name);
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if (!name_escaped)
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return -ENOMEM;
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where = strjoin(arg_runtime_directory, "/keydev-", name_escaped);
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if (!where)
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return -ENOMEM;
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r = mkdir(where, 0700);
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if (r < 0 && errno != EEXIST)
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return -errno;
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r = unit_name_from_path(where, ".mount", &u);
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if (r < 0)
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return r;
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r = generator_open_unit_file(arg_dest, NULL, u, &f);
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if (r < 0)
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return r;
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fprintf(f,
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"[Unit]\n"
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"DefaultDependencies=no\n\n"
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"[Mount]\n"
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"What=%s\n"
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"Where=%s\n"
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"Options=ro%s\n", keydev, where, canfail ? ",nofail" : "");
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if (keydev_timeout) {
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r = parse_sec_fix_0(keydev_timeout, &timeout_us);
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if (r >= 0) {
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r = unit_name_from_path(keydev, ".device", &device_unit);
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if (r < 0)
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return log_error_errno(r, "Failed to generate unit name: %m");
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r = write_drop_in_format(arg_dest, device_unit, 90, "device-timeout",
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"# Automatically generated by systemd-cryptsetup-generator \n\n"
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"[Unit]\nJobRunningTimeoutSec=%s", keydev_timeout);
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if (r < 0)
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return log_error_errno(r, "Failed to write device drop-in: %m");
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} else
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log_warning_errno(r, "Failed to parse %s, ignoring: %m", keydev_timeout);
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}
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r = fflush_and_check(f);
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if (r < 0)
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return r;
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*unit = TAKE_PTR(u);
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*mount = TAKE_PTR(where);
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return 0;
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}
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static int print_dependencies(FILE *f, const char* device_path) {
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int r;
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if (STR_IN_SET(device_path, "-", "none"))
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/* None, nothing to do */
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return 0;
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if (PATH_IN_SET(device_path, "/dev/urandom", "/dev/random", "/dev/hw_random")) {
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/* RNG device, add random dep */
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fputs("After=systemd-random-seed.service\n", f);
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return 0;
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}
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_cleanup_free_ char *udev_node = fstab_node_to_udev_node(device_path);
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if (!udev_node)
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return log_oom();
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if (path_equal(udev_node, "/dev/null"))
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return 0;
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if (path_startswith(udev_node, "/dev/")) {
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/* We are dealing with a block device, add dependency for corresponding unit */
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_cleanup_free_ char *unit = NULL;
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r = unit_name_from_path(udev_node, ".device", &unit);
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if (r < 0)
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return log_error_errno(r, "Failed to generate unit name: %m");
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fprintf(f, "After=%1$s\nRequires=%1$s\n", unit);
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} else {
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/* Regular file, add mount dependency */
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_cleanup_free_ char *escaped_path = specifier_escape(device_path);
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if (!escaped_path)
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return log_oom();
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fprintf(f, "RequiresMountsFor=%s\n", escaped_path);
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}
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return 0;
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}
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static int create_disk(
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const char *name,
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const char *device,
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const char *password,
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const char *keydev,
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const char *options) {
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_cleanup_free_ char *n = NULL, *d = NULL, *u = NULL, *e = NULL,
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*keydev_mount = NULL, *keyfile_timeout_value = NULL,
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*filtered = NULL, *u_escaped = NULL, *name_escaped = NULL, *header_path = NULL, *password_buffer = NULL;
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_cleanup_fclose_ FILE *f = NULL;
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const char *dmname;
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bool noauto, nofail, tmp, swap, netdev, attach_in_initrd;
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int r, detached_header, keyfile_can_timeout;
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assert(name);
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assert(device);
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noauto = fstab_test_yes_no_option(options, "noauto\0" "auto\0");
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nofail = fstab_test_yes_no_option(options, "nofail\0" "fail\0");
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tmp = fstab_test_option(options, "tmp\0");
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swap = fstab_test_option(options, "swap\0");
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netdev = fstab_test_option(options, "_netdev\0");
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attach_in_initrd = fstab_test_option(options, "x-initrd.attach\0");
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keyfile_can_timeout = fstab_filter_options(options, "keyfile-timeout\0", NULL, &keyfile_timeout_value, NULL);
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if (keyfile_can_timeout < 0)
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return log_error_errno(keyfile_can_timeout, "Failed to parse keyfile-timeout= option value: %m");
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detached_header = fstab_filter_options(options, "header\0", NULL, &header_path, NULL);
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if (detached_header < 0)
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return log_error_errno(detached_header, "Failed to parse header= option value: %m");
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if (tmp && swap)
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
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"Device '%s' cannot be both 'tmp' and 'swap'. Ignoring.",
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name);
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name_escaped = specifier_escape(name);
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if (!name_escaped)
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return log_oom();
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e = unit_name_escape(name);
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if (!e)
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return log_oom();
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u = fstab_node_to_udev_node(device);
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if (!u)
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return log_oom();
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r = unit_name_build("systemd-cryptsetup", e, ".service", &n);
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if (r < 0)
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return log_error_errno(r, "Failed to generate unit name: %m");
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u_escaped = specifier_escape(u);
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if (!u_escaped)
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return log_oom();
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r = unit_name_from_path(u, ".device", &d);
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if (r < 0)
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return log_error_errno(r, "Failed to generate unit name: %m");
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if (keydev && !password)
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
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"Key device is specified, but path to the password file is missing.");
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r = generator_open_unit_file(arg_dest, NULL, n, &f);
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if (r < 0)
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return r;
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r = generator_write_cryptsetup_unit_section(f, arg_crypttab);
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if (r < 0)
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return r;
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if (netdev)
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fprintf(f, "After=remote-fs-pre.target\n");
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/* If initrd takes care of attaching the disk then it should also detach it during shutdown. */
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if (!attach_in_initrd)
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fprintf(f, "Conflicts=umount.target\n");
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if (keydev) {
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_cleanup_free_ char *unit = NULL;
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r = generate_keydev_mount(name, keydev, keyfile_timeout_value, keyfile_can_timeout > 0, &unit, &keydev_mount);
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if (r < 0)
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return log_error_errno(r, "Failed to generate keydev mount unit: %m");
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password_buffer = path_join(keydev_mount, password);
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if (!password_buffer)
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return log_oom();
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password = password_buffer;
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fprintf(f, "After=%s\n", unit);
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if (keyfile_can_timeout > 0)
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fprintf(f, "Wants=%s\n", unit);
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else
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fprintf(f, "Requires=%s\n", unit);
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}
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if (!nofail)
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fprintf(f,
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"Before=%s\n",
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netdev ? "remote-cryptsetup.target" : "cryptsetup.target");
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if (password && !keydev) {
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r = print_dependencies(f, password);
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if (r < 0)
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return r;
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}
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/* Check if a header option was specified */
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if (detached_header > 0) {
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r = print_dependencies(f, header_path);
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if (r < 0)
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return r;
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}
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if (path_startswith(u, "/dev/"))
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fprintf(f,
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"BindsTo=%s\n"
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"After=%s\n"
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"Before=umount.target\n",
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d, d);
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else
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/* For loopback devices, add systemd-tmpfiles-setup-dev.service
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dependency to ensure that loopback support is available in
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the kernel (/dev/loop-control needs to exist) */
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fprintf(f,
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"RequiresMountsFor=%s\n"
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"Requires=systemd-tmpfiles-setup-dev.service\n"
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"After=systemd-tmpfiles-setup-dev.service\n",
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u_escaped);
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r = generator_write_timeouts(arg_dest, device, name, options, &filtered);
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if (r < 0)
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log_warning_errno(r, "Failed to write device timeout drop-in: %m");
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r = generator_write_cryptsetup_service_section(f, name, u, password, filtered);
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if (r < 0)
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return r;
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if (tmp)
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fprintf(f,
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"ExecStartPost=/sbin/mke2fs '/dev/mapper/%s'\n",
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name_escaped);
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if (swap)
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fprintf(f,
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"ExecStartPost=/sbin/mkswap '/dev/mapper/%s'\n",
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name_escaped);
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if (keydev)
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fprintf(f,
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"ExecStartPost=-" UMOUNT_PATH " %s\n\n",
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keydev_mount);
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r = fflush_and_check(f);
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if (r < 0)
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return log_error_errno(r, "Failed to write unit file %s: %m", n);
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if (!noauto) {
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r = generator_add_symlink(arg_dest,
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netdev ? "remote-cryptsetup.target" : "cryptsetup.target",
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nofail ? "wants" : "requires", n);
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if (r < 0)
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return r;
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}
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dmname = strjoina("dev-mapper-", e, ".device");
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r = generator_add_symlink(arg_dest, dmname, "requires", n);
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if (r < 0)
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return r;
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if (!noauto && !nofail) {
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r = write_drop_in(arg_dest, dmname, 40, "device-timeout",
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"# Automatically generated by systemd-cryptsetup-generator\n\n"
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"[Unit]\nJobTimeoutSec=0");
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if (r < 0)
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log_warning_errno(r, "Failed to write device timeout drop-in: %m");
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}
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return 0;
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}
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static crypto_device* crypt_device_free(crypto_device *d) {
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if (!d)
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return NULL;
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free(d->uuid);
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free(d->keyfile);
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free(d->keydev);
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free(d->name);
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free(d->options);
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return mfree(d);
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}
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static crypto_device *get_crypto_device(const char *uuid) {
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int r;
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crypto_device *d;
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assert(uuid);
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d = hashmap_get(arg_disks, uuid);
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if (!d) {
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d = new0(struct crypto_device, 1);
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if (!d)
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return NULL;
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d->uuid = strdup(uuid);
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if (!d->uuid)
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return mfree(d);
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r = hashmap_put(arg_disks, d->uuid, d);
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if (r < 0) {
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free(d->uuid);
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return mfree(d);
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}
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}
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return d;
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}
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static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
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_cleanup_free_ char *uuid = NULL, *uuid_value = NULL;
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crypto_device *d;
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int r;
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if (streq(key, "luks")) {
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r = value ? parse_boolean(value) : 1;
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if (r < 0)
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log_warning("Failed to parse luks= kernel command line switch %s. Ignoring.", value);
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else
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arg_enabled = r;
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} else if (streq(key, "luks.crypttab")) {
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r = value ? parse_boolean(value) : 1;
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if (r < 0)
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log_warning("Failed to parse luks.crypttab= kernel command line switch %s. Ignoring.", value);
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else
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arg_read_crypttab = r;
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} else if (streq(key, "luks.uuid")) {
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if (proc_cmdline_value_missing(key, value))
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return 0;
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d = get_crypto_device(startswith(value, "luks-") ? value+5 : value);
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if (!d)
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return log_oom();
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d->create = arg_whitelist = true;
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} else if (streq(key, "luks.options")) {
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if (proc_cmdline_value_missing(key, value))
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return 0;
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r = sscanf(value, "%m[0-9a-fA-F-]=%ms", &uuid, &uuid_value);
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if (r == 2) {
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d = get_crypto_device(uuid);
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if (!d)
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return log_oom();
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free_and_replace(d->options, uuid_value);
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} else if (free_and_strdup(&arg_default_options, value) < 0)
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return log_oom();
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} else if (streq(key, "luks.key")) {
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size_t n;
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_cleanup_free_ char *keyfile = NULL, *keydev = NULL;
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const char *keyspec;
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if (proc_cmdline_value_missing(key, value))
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return 0;
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n = strspn(value, LETTERS DIGITS "-");
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if (value[n] != '=') {
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if (free_and_strdup(&arg_default_keyfile, value) < 0)
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return log_oom();
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return 0;
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}
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uuid = strndup(value, n);
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if (!uuid)
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return log_oom();
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if (!id128_is_valid(uuid)) {
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log_warning("Failed to parse luks.key= kernel command line switch. UUID is invalid, ignoring.");
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return 0;
|
|
}
|
|
|
|
d = get_crypto_device(uuid);
|
|
if (!d)
|
|
return log_oom();
|
|
|
|
keyspec = value + n + 1;
|
|
r = split_keyspec(keyspec, &keyfile, &keydev);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
free_and_replace(d->keyfile, keyfile);
|
|
free_and_replace(d->keydev, keydev);
|
|
|
|
} else if (streq(key, "luks.name")) {
|
|
|
|
if (proc_cmdline_value_missing(key, value))
|
|
return 0;
|
|
|
|
r = sscanf(value, "%m[0-9a-fA-F-]=%ms", &uuid, &uuid_value);
|
|
if (r == 2) {
|
|
d = get_crypto_device(uuid);
|
|
if (!d)
|
|
return log_oom();
|
|
|
|
d->create = arg_whitelist = true;
|
|
|
|
free_and_replace(d->name, uuid_value);
|
|
} else
|
|
log_warning("Failed to parse luks name switch %s. Ignoring.", value);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int add_crypttab_devices(void) {
|
|
_cleanup_fclose_ FILE *f = NULL;
|
|
unsigned crypttab_line = 0;
|
|
struct stat st;
|
|
int r;
|
|
|
|
if (!arg_read_crypttab)
|
|
return 0;
|
|
|
|
r = fopen_unlocked(arg_crypttab, "re", &f);
|
|
if (r < 0) {
|
|
if (errno != ENOENT)
|
|
log_error_errno(errno, "Failed to open %s: %m", arg_crypttab);
|
|
return 0;
|
|
}
|
|
|
|
if (fstat(fileno(f), &st) < 0) {
|
|
log_error_errno(errno, "Failed to stat %s: %m", arg_crypttab);
|
|
return 0;
|
|
}
|
|
|
|
for (;;) {
|
|
_cleanup_free_ char *line = NULL, *name = NULL, *device = NULL, *keyspec = NULL, *options = NULL, *keyfile = NULL, *keydev = NULL;
|
|
crypto_device *d = NULL;
|
|
char *l, *uuid;
|
|
int k;
|
|
|
|
r = read_line(f, LONG_LINE_MAX, &line);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to read %s: %m", arg_crypttab);
|
|
if (r == 0)
|
|
break;
|
|
|
|
crypttab_line++;
|
|
|
|
l = strstrip(line);
|
|
if (IN_SET(l[0], 0, '#'))
|
|
continue;
|
|
|
|
k = sscanf(l, "%ms %ms %ms %ms", &name, &device, &keyspec, &options);
|
|
if (k < 2 || k > 4) {
|
|
log_error("Failed to parse %s:%u, ignoring.", arg_crypttab, crypttab_line);
|
|
continue;
|
|
}
|
|
|
|
uuid = startswith(device, "UUID=");
|
|
if (!uuid)
|
|
uuid = path_startswith(device, "/dev/disk/by-uuid/");
|
|
if (!uuid)
|
|
uuid = startswith(name, "luks-");
|
|
if (uuid)
|
|
d = hashmap_get(arg_disks, uuid);
|
|
|
|
if (arg_whitelist && !d) {
|
|
log_info("Not creating device '%s' because it was not specified on the kernel command line.", name);
|
|
continue;
|
|
}
|
|
|
|
r = split_keyspec(keyspec, &keyfile, &keydev);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = create_disk(name, device, keyfile, keydev, (d && d->options) ? d->options : options);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (d)
|
|
d->create = false;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int add_proc_cmdline_devices(void) {
|
|
int r;
|
|
Iterator i;
|
|
crypto_device *d;
|
|
|
|
HASHMAP_FOREACH(d, arg_disks, i) {
|
|
_cleanup_free_ char *device = NULL;
|
|
|
|
if (!d->create)
|
|
continue;
|
|
|
|
if (!d->name) {
|
|
d->name = strjoin("luks-", d->uuid);
|
|
if (!d->name)
|
|
return log_oom();
|
|
}
|
|
|
|
device = strjoin("UUID=", d->uuid);
|
|
if (!device)
|
|
return log_oom();
|
|
|
|
r = create_disk(d->name,
|
|
device,
|
|
d->keyfile ?: arg_default_keyfile,
|
|
d->keydev,
|
|
d->options ?: arg_default_options);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(crypt_device_hash_ops, char, string_hash_func, string_compare_func,
|
|
crypto_device, crypt_device_free);
|
|
|
|
static int run(const char *dest, const char *dest_early, const char *dest_late) {
|
|
int r;
|
|
|
|
assert_se(arg_dest = dest);
|
|
|
|
arg_crypttab = getenv("SYSTEMD_CRYPTTAB") ?: "/etc/crypttab";
|
|
arg_runtime_directory = getenv("RUNTIME_DIRECTORY") ?: "/run/systemd/cryptsetup";
|
|
|
|
arg_disks = hashmap_new(&crypt_device_hash_ops);
|
|
if (!arg_disks)
|
|
return log_oom();
|
|
|
|
r = proc_cmdline_parse(parse_proc_cmdline_item, NULL, PROC_CMDLINE_STRIP_RD_PREFIX);
|
|
if (r < 0)
|
|
return log_warning_errno(r, "Failed to parse kernel command line: %m");
|
|
|
|
if (!arg_enabled)
|
|
return 0;
|
|
|
|
r = add_crypttab_devices();
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = add_proc_cmdline_devices();
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
DEFINE_MAIN_GENERATOR_FUNCTION(run);
|