450 lines
13 KiB
C
450 lines
13 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 "virt.h"
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#include "strv.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_proc_cmdline_disks = 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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char *p = NULL, *n = NULL, *d = NULL, *u = NULL, *from = NULL, *to = NULL, *e = NULL;
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int r;
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FILE *f = NULL;
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bool noauto, nofail;
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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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n = unit_name_from_path_instance("systemd-cryptsetup", name, ".service");
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if (!n) {
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r = -ENOMEM;
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log_error("Failed to allocate unit name.");
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goto fail;
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}
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p = strjoin(arg_dest, "/", n, NULL);
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if (!p) {
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r = -ENOMEM;
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log_error("Failed to allocate unit file name.");
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goto fail;
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}
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u = fstab_node_to_udev_node(device);
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if (!u) {
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r = -ENOMEM;
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log_error("Failed to allocate device node.");
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goto fail;
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}
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d = unit_name_from_path(u, ".device");
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if (!d) {
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r = -ENOMEM;
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log_error("Failed to allocate device name.");
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goto fail;
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}
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f = fopen(p, "wxe");
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if (!f) {
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r = -errno;
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log_error("Failed to create unit file: %m");
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goto fail;
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}
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fprintf(f,
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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:systemd-cryptsetup@.service(8) man:crypttab(5)\n"
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"SourcePath=/etc/crypttab\n"
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"Conflicts=umount.target\n"
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"DefaultDependencies=no\n"
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"BindsTo=%s dev-mapper-%%i.device\n"
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"After=systemd-readahead-collect.service systemd-readahead-replay.service %s\n"
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"Before=umount.target\n",
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d, d);
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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 && (streq(password, "/dev/urandom") ||
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streq(password, "/dev/random") ||
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streq(password, "/dev/hw_random")))
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fputs("After=systemd-random-seed-load.service\n", f);
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else
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fputs("Before=local-fs.target\n", f);
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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(options),
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name);
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if (has_option(options, "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 (has_option(options, "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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r = -errno;
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log_error("Failed to write file: %m");
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goto fail;
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}
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if (asprintf(&from, "../%s", n) < 0) {
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r = -ENOMEM;
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goto fail;
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}
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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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r = -ENOMEM;
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goto fail;
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}
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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' to '%s': %m", from, to);
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r = -errno;
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goto fail;
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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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r = -ENOMEM;
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goto fail;
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}
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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' to '%s': %m", from, to);
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r = -errno;
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goto fail;
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}
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free(to);
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to = NULL;
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}
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e = unit_name_escape(name);
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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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r = -ENOMEM;
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goto fail;
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}
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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' to '%s': %m", from, to);
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r = -errno;
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goto fail;
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}
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r = 0;
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fail:
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free(p);
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free(n);
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free(d);
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free(e);
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free(from);
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free(to);
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if (f)
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fclose(f);
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return r;
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}
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static int parse_proc_cmdline(void) {
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char *line, *w, *state;
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int r;
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size_t l;
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if (detect_container(NULL) > 0)
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return 0;
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r = read_one_line_file("/proc/cmdline", &line);
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if (r < 0) {
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log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
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return 0;
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}
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FOREACH_WORD_QUOTED(w, l, line, state) {
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char *word;
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word = strndup(w, l);
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if (!word) {
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r = -ENOMEM;
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goto finish;
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}
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if (startswith(word, "luks=")) {
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r = parse_boolean(word + 5);
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if (r < 0)
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log_warning("Failed to parse luks switch %s. Ignoring.", word + 5);
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else
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arg_enabled = r;
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} else if (startswith(word, "rd.luks=")) {
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if (in_initrd()) {
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r = parse_boolean(word + 8);
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if (r < 0)
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log_warning("Failed to parse luks switch %s. Ignoring.", word + 8);
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else
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arg_enabled = r;
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}
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} else if (startswith(word, "luks.crypttab=")) {
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r = parse_boolean(word + 14);
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if (r < 0)
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log_warning("Failed to parse luks crypttab switch %s. Ignoring.", word + 14);
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else
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arg_read_crypttab = r;
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} else if (startswith(word, "rd.luks.crypttab=")) {
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if (in_initrd()) {
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r = parse_boolean(word + 17);
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if (r < 0)
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log_warning("Failed to parse luks crypttab switch %s. Ignoring.", word + 17);
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else
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arg_read_crypttab = r;
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}
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} else if (startswith(word, "luks.uuid=")) {
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char **t;
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t = strv_append(arg_proc_cmdline_disks, word + 10);
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if (!t) {
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r = log_oom();
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goto finish;
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}
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strv_free(arg_proc_cmdline_disks);
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arg_proc_cmdline_disks = t;
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} else if (startswith(word, "rd.luks.uuid=")) {
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if (in_initrd()) {
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char **t;
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t = strv_append(arg_proc_cmdline_disks, word + 13);
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if (!t) {
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r = log_oom();
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goto finish;
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}
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strv_free(arg_proc_cmdline_disks);
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arg_proc_cmdline_disks = t;
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}
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} else if (startswith(word, "luks.") ||
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(in_initrd() && startswith(word, "rd.luks."))) {
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log_warning("Unknown kernel switch %s. Ignoring.", word);
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}
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free(word);
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}
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r = 0;
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finish:
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free(line);
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return r;
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}
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int main(int argc, char *argv[]) {
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FILE *f = NULL;
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int r = EXIT_SUCCESS;
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unsigned n = 0;
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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() < 0)
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return EXIT_FAILURE;
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if (!arg_enabled) {
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r = EXIT_SUCCESS;
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goto finish;
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}
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STRV_FOREACH(i, arg_proc_cmdline_disks) {
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char *name, *device;
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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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name = strappend("luks-", *i);
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device = strappend("UUID=", *i);
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if (!name || !device) {
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log_oom();
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r = EXIT_FAILURE;
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free(name);
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free(device);
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goto finish;
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}
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if (create_disk(name, device, NULL, NULL) < 0)
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r = EXIT_FAILURE;
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free(name);
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free(device);
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}
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if (!arg_read_crypttab)
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return r;
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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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r = EXIT_FAILURE;
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log_error("Failed to open /etc/crypttab: %m");
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}
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goto finish;
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}
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for (;;) {
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char line[LINE_MAX], *l;
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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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r = EXIT_FAILURE;
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goto next;
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}
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if (create_disk(name, device, password, options) < 0)
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r = EXIT_FAILURE;
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next:
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free(name);
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free(device);
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free(password);
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free(options);
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}
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finish:
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if (f)
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fclose(f);
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strv_free(arg_proc_cmdline_disks);
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return r;
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}
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