516 lines
18 KiB
C
516 lines
18 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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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 <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include "log.h"
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#include "util.h"
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#include "unit-name.h"
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#include "mkdir.h"
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#include "strv.h"
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#include "fileio.h"
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#include "path-util.h"
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#include "dropin.h"
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#include "generator.h"
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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 char **arg_disks = NULL;
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static char **arg_options = NULL;
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static char *arg_keyfile = NULL;
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static bool has_option(const char *haystack, const char *needle) {
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const char *f = haystack;
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size_t l;
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assert(needle);
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if (!haystack)
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return false;
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l = strlen(needle);
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while ((f = strstr(f, needle))) {
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if (f > haystack && f[-1] != ',') {
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f++;
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continue;
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}
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if (f[l] != 0 && f[l] != ',') {
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f++;
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continue;
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}
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return true;
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}
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return false;
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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 *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 = has_option(options, "noauto");
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nofail = has_option(options, "nofail");
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tmp = has_option(options, "tmp");
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swap = has_option(options, "swap");
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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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n = unit_name_build("systemd-cryptsetup", e, ".service");
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if (!n)
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return log_oom();
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p = strjoin(arg_dest, "/", n, NULL);
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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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d = unit_name_from_path(u, ".device");
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if (!d)
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return log_oom();
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f = fopen(p, "wxe");
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if (!f) {
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log_error("Failed to create unit file %s: %m", p);
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return -errno;
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}
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fputs(
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"# 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;
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dd = unit_name_from_path(uu, ".device");
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if (!dd)
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return log_oom();
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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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fflush(f);
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if (ferror(f)) {
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log_error("Failed to write file %s: %m", p);
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return -errno;
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}
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from = strappenda("../", n);
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if (!noauto) {
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to = strjoin(arg_dest, "/", d, ".wants/", n, NULL);
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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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log_error("Failed to create symlink %s: %m", to);
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return -errno;
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}
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free(to);
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if (!nofail)
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to = strjoin(arg_dest, "/cryptsetup.target.requires/", n, NULL);
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else
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to = strjoin(arg_dest, "/cryptsetup.target.wants/", n, NULL);
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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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log_error("Failed to create symlink %s: %m", to);
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return -errno;
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}
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}
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free(to);
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to = strjoin(arg_dest, "/dev-mapper-", e, ".device.requires/", n, NULL);
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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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log_error("Failed to create symlink %s: %m", to);
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return -errno;
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}
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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", NULL);
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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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log_error("Failed to write device drop-in: %s", strerror(-r));
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return r;
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}
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}
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return 0;
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}
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static int parse_proc_cmdline_item(const char *key, const char *value) {
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int r;
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if (STR_IN_SET(key, "luks", "rd.luks") && value) {
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r = parse_boolean(value);
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if (r < 0)
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log_warning("Failed to parse luks switch %s. Ignoring.", value);
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else
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arg_enabled = r;
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} else if (STR_IN_SET(key, "luks.crypttab", "rd.luks.crypttab") && value) {
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r = parse_boolean(value);
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if (r < 0)
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log_warning("Failed to parse luks crypttab switch %s. Ignoring.", value);
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else
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arg_read_crypttab = r;
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} else if (STR_IN_SET(key, "luks.uuid", "rd.luks.uuid") && value) {
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if (strv_extend(&arg_disks, value) < 0)
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return log_oom();
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} else if (STR_IN_SET(key, "luks.options", "rd.luks.options") && value) {
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if (strv_extend(&arg_options, value) < 0)
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return log_oom();
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} else if (STR_IN_SET(key, "luks.key", "rd.luks.key") && value) {
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free(arg_keyfile);
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arg_keyfile = strdup(value);
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if (!arg_keyfile)
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return log_oom();
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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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_cleanup_strv_free_ char **disks_done = NULL;
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_cleanup_fclose_ FILE *f = NULL;
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unsigned n = 0;
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int r = EXIT_FAILURE, r2 = EXIT_FAILURE;
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char **i;
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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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if (parse_proc_cmdline(parse_proc_cmdline_item) < 0)
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goto cleanup;
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if (!arg_enabled) {
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r = r2 = EXIT_SUCCESS;
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goto cleanup;
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}
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strv_uniq(arg_disks);
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if (arg_read_crypttab) {
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struct stat st;
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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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r = EXIT_SUCCESS;
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else
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log_error("Failed to open /etc/crypttab: %m");
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goto next;
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}
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if (fstat(fileno(f), &st) < 0) {
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log_error("Failed to stat /etc/crypttab: %m");
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goto next;
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}
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/* If we readd support for specifying passphrases
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* directly in crypttabe we should upgrade the warning
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* below, though possibly only if a passphrase is
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* specified directly. */
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if (st.st_mode & 0005)
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log_debug("/etc/crypttab is world-readable. This is usually not a good idea.");
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for (;;) {
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char line[LINE_MAX], *l;
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_cleanup_free_ char *name = NULL, *device = NULL, *password = NULL, *options = NULL;
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int k;
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if (!fgets(line, sizeof(line), f))
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break;
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n++;
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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, &password, &options);
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if (k < 2 || k > 4) {
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log_error("Failed to parse /etc/crypttab:%u, ignoring.", n);
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continue;
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}
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/*
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If options are specified on the kernel command line, let them override
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the ones from crypttab.
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*/
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STRV_FOREACH(i, arg_options) {
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_cleanup_free_ char *proc_uuid = NULL, *proc_options = NULL;
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const char *p = *i;
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k = sscanf(p, "%m[0-9a-fA-F-]=%ms", &proc_uuid, &proc_options);
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if (k == 2 && streq(proc_uuid, device + 5)) {
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free(options);
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options = strdup(p);
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if (!options) {
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log_oom();
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goto cleanup;
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}
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}
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}
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if (arg_disks) {
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/*
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If luks UUIDs are specified on the kernel command line, use them as a filter
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for /etc/crypttab and only generate units for those.
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*/
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STRV_FOREACH(i, arg_disks) {
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_cleanup_free_ char *proc_device = NULL, *proc_name = NULL;
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const char *p = *i;
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if (startswith(p, "luks-"))
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p += 5;
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proc_name = strappend("luks-", p);
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proc_device = strappend("UUID=", p);
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if (!proc_name || !proc_device) {
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log_oom();
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goto cleanup;
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}
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if (streq(proc_device, device) || streq(proc_name, name)) {
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if (create_disk(name, device, password, options) < 0)
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goto cleanup;
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if (strv_extend(&disks_done, p) < 0) {
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log_oom();
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goto cleanup;
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}
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}
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}
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} else if (create_disk(name, device, password, options) < 0)
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goto cleanup;
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}
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}
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r = EXIT_SUCCESS;
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next:
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STRV_FOREACH(i, arg_disks) {
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/*
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Generate units for those UUIDs, which were specified
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on the kernel command line and not yet written.
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*/
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_cleanup_free_ char *name = NULL, *device = NULL, *options = NULL;
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const char *p = *i;
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if (startswith(p, "luks-"))
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p += 5;
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if (strv_contains(disks_done, p))
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continue;
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name = strappend("luks-", p);
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device = strappend("UUID=", p);
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if (!name || !device) {
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log_oom();
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goto cleanup;
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}
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if (arg_options) {
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/*
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If options are specified on the kernel command line, use them.
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*/
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char **j;
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STRV_FOREACH(j, arg_options) {
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_cleanup_free_ char *proc_uuid = NULL, *proc_options = NULL;
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const char *s = *j;
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int k;
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k = sscanf(s, "%m[0-9a-fA-F-]=%ms", &proc_uuid, &proc_options);
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if (k == 2) {
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if (streq(proc_uuid, device + 5)) {
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free(options);
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options = proc_options;
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proc_options = NULL;
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}
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} else if (!options) {
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/*
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Fall back to options without a specified UUID
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*/
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options = strdup(s);
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if (!options) {
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log_oom();
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goto cleanup;
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};
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}
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}
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}
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if (!options) {
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options = strdup("timeout=0");
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if (!options) {
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log_oom();
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goto cleanup;
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}
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}
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if (create_disk(name, device, arg_keyfile, options) < 0)
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goto cleanup;
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}
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r2 = EXIT_SUCCESS;
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cleanup:
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strv_free(arg_disks);
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strv_free(arg_options);
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free(arg_keyfile);
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return r != EXIT_SUCCESS ? r : r2;
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}
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