607 lines
20 KiB
C
607 lines
20 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 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 generate_keydev_mount(const char *name, const char *keydev, char **unit, char **mount) {
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_cleanup_free_ char *u = NULL, *what = NULL, *where = NULL, *name_escaped = NULL;
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_cleanup_fclose_ FILE *f = NULL;
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int r;
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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("/run/systemd/cryptsetup", 0755);
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if (r < 0)
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return r;
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r = mkdir("/run/systemd/cryptsetup", 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("/run/systemd/cryptsetup/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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what = fstab_node_to_udev_node(keydev);
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if (!what)
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return -ENOMEM;
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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\n", what, where);
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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 create_disk(
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const char *name,
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const char *device,
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const char *keydev,
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const char *password,
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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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*filtered = NULL, *u_escaped = NULL, *password_escaped = NULL, *filtered_escaped = NULL, *name_escaped = NULL, *keydev_mount = 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;
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int r;
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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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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 (password) {
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password_escaped = specifier_escape(password);
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if (!password_escaped)
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return log_oom();
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}
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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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fprintf(f,
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"[Unit]\n"
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"Description=Cryptography Setup for %%I\n"
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"Documentation=man:crypttab(5) man:systemd-cryptsetup-generator(8) man:systemd-cryptsetup@.service(8)\n"
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"SourcePath=/etc/crypttab\n"
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"DefaultDependencies=no\n"
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"Conflicts=umount.target\n"
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"IgnoreOnIsolate=true\n"
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"After=%s\n",
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netdev ? "remote-fs-pre.target" : "cryptsetup-pre.target");
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if (keydev) {
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_cleanup_free_ char *unit = NULL, *p = NULL;
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r = generate_keydev_mount(name, keydev, &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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p = prefix_root(keydev_mount, password_escaped);
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if (!p)
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return log_oom();
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free_and_replace(password_escaped, p);
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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) {
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if (PATH_IN_SET(password, "/dev/urandom", "/dev/random", "/dev/hw_random"))
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fputs("After=systemd-random-seed.service\n", f);
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else if (!STR_IN_SET(password, "-", "none")) {
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_cleanup_free_ char *uu;
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uu = fstab_node_to_udev_node(password);
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if (!uu)
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return log_oom();
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if (!path_equal(uu, "/dev/null")) {
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if (path_startswith(uu, "/dev/")) {
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_cleanup_free_ char *dd = NULL;
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r = unit_name_from_path(uu, ".device", &dd);
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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", dd);
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} else
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fprintf(f, "RequiresMountsFor=%s\n", password_escaped);
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}
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}
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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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if (swap)
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fputs("Before=dev-mapper-%i.swap\n",
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f);
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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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return r;
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if (filtered) {
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filtered_escaped = specifier_escape(filtered);
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if (!filtered_escaped)
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return log_oom();
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}
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fprintf(f,
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"\n[Service]\n"
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"Type=oneshot\n"
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"RemainAfterExit=yes\n"
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"TimeoutSec=0\n" /* the binary handles timeouts anyway */
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"KeyringMode=shared\n" /* make sure we can share cached keys among instances */
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"OOMScoreAdjust=500\n" /* unlocking can allocate a lot of memory if Argon2 is used */
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"ExecStart=" SYSTEMD_CRYPTSETUP_PATH " attach '%s' '%s' '%s' '%s'\n"
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"ExecStop=" SYSTEMD_CRYPTSETUP_PATH " detach '%s'\n",
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name_escaped, u_escaped, strempty(password_escaped), strempty(filtered_escaped),
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name_escaped);
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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, 90, "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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return log_error_errno(r, "Failed to write device 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->create = false;
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d->keyfile = d->options = d->name = 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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char *c;
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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;
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}
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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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keyspec = value + n + 1;
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c = strrchr(keyspec, ':');
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if (c) {
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*c = '\0';
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keyfile = strdup(keyspec);
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keydev = strdup(c + 1);
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if (!keyfile || !keydev)
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return log_oom();
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} else {
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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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}
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free_and_replace(d->keyfile, keyfile);
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free_and_replace(d->keydev, keydev);
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} else if (streq(key, "luks.name")) {
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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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d->create = arg_whitelist = true;
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free_and_replace(d->name, uuid_value);
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} else
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log_warning("Failed to parse luks name switch %s. Ignoring.", value);
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}
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return 0;
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}
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static int add_crypttab_devices(void) {
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_cleanup_fclose_ FILE *f = NULL;
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unsigned crypttab_line = 0;
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struct stat st;
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int r;
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if (!arg_read_crypttab)
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return 0;
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r = fopen_unlocked("/etc/crypttab", "re", &f);
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if (r < 0) {
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if (errno != ENOENT)
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log_error_errno(errno, "Failed to open /etc/crypttab: %m");
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return 0;
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}
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if (fstat(fileno(f), &st) < 0) {
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log_error_errno(errno, "Failed to stat /etc/crypttab: %m");
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return 0;
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}
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for (;;) {
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_cleanup_free_ char *line = NULL, *name = NULL, *device = NULL, *keyfile = NULL, *options = NULL;
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crypto_device *d = NULL;
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char *l, *uuid;
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int k;
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r = read_line(f, LONG_LINE_MAX, &line);
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if (r < 0)
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return log_error_errno(r, "Failed to read /etc/crypttab: %m");
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if (r == 0)
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break;
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crypttab_line++;
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l = strstrip(line);
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if (IN_SET(l[0], 0, '#'))
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continue;
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k = sscanf(l, "%ms %ms %ms %ms", &name, &device, &keyfile, &options);
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if (k < 2 || k > 4) {
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log_error("Failed to parse /etc/crypttab:%u, ignoring.", crypttab_line);
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continue;
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}
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uuid = STARTSWITH_SET(device, "UUID=", "luks-");
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if (!uuid)
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uuid = path_startswith(device, "/dev/disk/by-uuid/");
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if (uuid)
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d = hashmap_get(arg_disks, uuid);
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if (arg_whitelist && !d) {
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log_info("Not creating device '%s' because it was not specified on the kernel command line.", name);
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continue;
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}
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|
|
r = create_disk(name, device, NULL, keyfile, (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) {
|
|
const char *options;
|
|
_cleanup_free_ char *device = NULL;
|
|
|
|
if (!d->create)
|
|
continue;
|
|
|
|
if (!d->name) {
|
|
d->name = strappend("luks-", d->uuid);
|
|
if (!d->name)
|
|
return log_oom();
|
|
}
|
|
|
|
device = strappend("UUID=", d->uuid);
|
|
if (!device)
|
|
return log_oom();
|
|
|
|
if (d->options)
|
|
options = d->options;
|
|
else if (arg_default_options)
|
|
options = arg_default_options;
|
|
else
|
|
options = "timeout=0";
|
|
|
|
r = create_disk(d->name, device, d->keydev, d->keyfile ?: arg_default_keyfile, 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_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);
|