517 lines
16 KiB
C
517 lines
16 KiB
C
/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include "alloc-util.h"
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#include "dropin.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 "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 "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 *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 = "/tmp";
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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 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 *options) {
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_cleanup_free_ char *p = NULL, *n = NULL, *d = NULL, *u = NULL, *to = NULL, *e = NULL,
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*filtered = NULL;
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_cleanup_fclose_ FILE *f = NULL;
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bool noauto, nofail, tmp, swap;
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char *from;
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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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if (tmp && swap) {
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log_error("Device '%s' cannot be both 'tmp' and 'swap'. Ignoring.", name);
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return -EINVAL;
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}
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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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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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p = strjoin(arg_dest, "/", n);
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if (!p)
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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_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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f = fopen(p, "wxe");
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if (!f)
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return log_error_errno(errno, "Failed to create unit file %s: %m", p);
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fputs("# Automatically generated by systemd-cryptsetup-generator\n\n"
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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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"BindsTo=dev-mapper-%i.device\n"
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"IgnoreOnIsolate=true\n"
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"After=cryptsetup-pre.target\n",
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f);
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if (!nofail)
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fprintf(f,
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"Before=cryptsetup.target\n");
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if (password) {
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if (STR_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 (!streq(password, "-") && !streq(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 (is_device_path(uu)) {
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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);
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}
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}
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}
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if (is_device_path(u))
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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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fprintf(f,
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"RequiresMountsFor=%s\n",
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u);
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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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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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"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, u, strempty(password), strempty(filtered),
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name);
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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);
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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);
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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 file %s: %m", p);
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from = strjoina("../", n);
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if (!noauto) {
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to = strjoin(arg_dest, "/", d, ".wants/", n);
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if (!to)
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return log_oom();
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mkdir_parents_label(to, 0755);
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if (symlink(from, to) < 0)
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return log_error_errno(errno, "Failed to create symlink %s: %m", to);
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free(to);
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if (!nofail)
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to = strjoin(arg_dest, "/cryptsetup.target.requires/", n);
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else
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to = strjoin(arg_dest, "/cryptsetup.target.wants/", n);
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if (!to)
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return log_oom();
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mkdir_parents_label(to, 0755);
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if (symlink(from, to) < 0)
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return log_error_errno(errno, "Failed to create symlink %s: %m", to);
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}
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free(to);
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to = strjoin(arg_dest, "/dev-mapper-", e, ".device.requires/", n);
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if (!to)
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return log_oom();
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mkdir_parents_label(to, 0755);
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if (symlink(from, to) < 0)
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return log_error_errno(errno, "Failed to create symlink %s: %m", to);
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if (!noauto && !nofail) {
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_cleanup_free_ char *dmname;
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dmname = strjoin("dev-mapper-", e, ".device");
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if (!dmname)
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return log_oom();
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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 void free_arg_disks(void) {
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crypto_device *d;
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while ((d = hashmap_steal_first(arg_disks))) {
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free(d->uuid);
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free(d->keyfile);
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free(d->name);
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free(d->options);
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free(d);
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}
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hashmap_free(arg_disks);
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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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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->keyfile, uuid_value);
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} else if (free_and_strdup(&arg_default_keyfile, value) < 0)
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return log_oom();
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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(d->name);
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d->name = uuid_value;
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uuid_value = NULL;
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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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struct stat st;
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unsigned crypttab_line = 0;
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_cleanup_fclose_ FILE *f = NULL;
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if (!arg_read_crypttab)
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return 0;
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f = fopen("/etc/crypttab", "re");
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if (!f) {
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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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int r, k;
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char line[LINE_MAX], *l, *uuid;
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crypto_device *d = NULL;
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_cleanup_free_ char *name = NULL, *device = NULL, *keyfile = NULL, *options = NULL;
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if (!fgets(line, sizeof(line), f))
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break;
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crypttab_line++;
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l = strstrip(line);
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if (*l == '#' || *l == 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(device, "UUID=");
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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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uuid = startswith(name, "luks-");
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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, keyfile, (d && d->options) ? d->options : options);
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if (r < 0)
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return r;
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if (d)
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d->create = false;
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}
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return 0;
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}
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static int add_proc_cmdline_devices(void) {
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int r;
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Iterator i;
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crypto_device *d;
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HASHMAP_FOREACH(d, arg_disks, i) {
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const char *options;
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_cleanup_free_ char *device = NULL;
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if (!d->create)
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continue;
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if (!d->name) {
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d->name = strappend("luks-", d->uuid);
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if (!d->name)
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return log_oom();
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}
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device = strappend("UUID=", d->uuid);
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if (!device)
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return log_oom();
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if (d->options)
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options = d->options;
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else if (arg_default_options)
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options = arg_default_options;
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else
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options = "timeout=0";
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r = create_disk(d->name, device, d->keyfile ?: arg_default_keyfile, options);
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if (r < 0)
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return r;
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}
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return 0;
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}
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int main(int argc, char *argv[]) {
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int r;
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if (argc > 1 && argc != 4) {
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log_error("This program takes three or no arguments.");
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return EXIT_FAILURE;
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}
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if (argc > 1)
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arg_dest = argv[1];
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log_set_target(LOG_TARGET_SAFE);
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log_parse_environment();
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log_open();
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umask(0022);
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arg_disks = hashmap_new(&string_hash_ops);
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if (!arg_disks) {
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r = log_oom();
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goto finish;
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}
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r = proc_cmdline_parse(parse_proc_cmdline_item, NULL, PROC_CMDLINE_STRIP_RD_PREFIX);
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if (r < 0) {
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log_warning_errno(r, "Failed to parse kernel command line: %m");
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goto finish;
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}
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if (!arg_enabled) {
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r = 0;
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goto finish;
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}
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r = add_crypttab_devices();
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if (r < 0)
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goto finish;
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r = add_proc_cmdline_devices();
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if (r < 0)
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goto finish;
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r = 0;
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finish:
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free_arg_disks();
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free(arg_default_options);
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free(arg_default_keyfile);
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return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
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}
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