1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
28 #include "unit-name.h"
34 static const char *arg_dest = "/tmp";
35 static bool arg_enabled = true;
36 static bool arg_read_crypttab = true;
38 static bool has_option(const char *haystack, const char *needle) {
39 const char *f = haystack;
49 while ((f = strstr(f, needle))) {
51 if (f > haystack && f[-1] != ',') {
56 if (f[l] != 0 && f[l] != ',') {
67 static int create_disk(
71 const char *options) {
73 char _cleanup_free_ *p = NULL, *n = NULL, *d = NULL, *u = NULL, *from = NULL, *to = NULL, *e = NULL;
74 FILE _cleanup_fclose_ *f = NULL;
80 noauto = has_option(options, "noauto");
81 nofail = has_option(options, "nofail");
83 n = unit_name_from_path_instance("systemd-cryptsetup", name, ".service");
87 p = strjoin(arg_dest, "/", n, NULL);
91 u = fstab_node_to_udev_node(device);
95 d = unit_name_from_path(u, ".device");
101 log_error("Failed to create unit file %s: %m", p);
106 "# Automatically generated by systemd-cryptsetup-generator\n\n"
108 "Description=Cryptography Setup for %I\n"
109 "Documentation=man:systemd-cryptsetup@.service(8) man:crypttab(5)\n"
110 "SourcePath=/etc/crypttab\n"
111 "Conflicts=umount.target\n"
112 "DefaultDependencies=no\n"
113 "BindsTo=dev-mapper-%i.device\n"
114 "After=systemd-readahead-collect.service systemd-readahead-replay.service\n",
119 "Before=cryptsetup.target\n");
122 if (streq(password, "/dev/urandom") ||
123 streq(password, "/dev/random") ||
124 streq(password, "/dev/hw_random"))
125 fputs("After=systemd-random-seed-load.service\n", f);
126 else if (!streq(password, "-") &&
127 !streq(password, "none"))
129 "RequiresMountsFor=%s\n",
133 if (is_device_path(u))
137 "Before=umount.target\n",
141 "RequiresMountsFor=%s\n",
147 "RemainAfterExit=yes\n"
148 "TimeoutSec=0\n" /* the binary handles timeouts anyway */
149 "ExecStart=" SYSTEMD_CRYPTSETUP_PATH " attach '%s' '%s' '%s' '%s'\n"
150 "ExecStop=" SYSTEMD_CRYPTSETUP_PATH " detach '%s'\n",
151 name, u, strempty(password), strempty(options),
154 if (has_option(options, "tmp"))
156 "ExecStartPost=/sbin/mke2fs '/dev/mapper/%s'\n",
159 if (has_option(options, "swap"))
161 "ExecStartPost=/sbin/mkswap '/dev/mapper/%s'\n",
167 log_error("Failed to write file %s: %m", p);
171 if (asprintf(&from, "../%s", n) < 0)
176 to = strjoin(arg_dest, "/", d, ".wants/", n, NULL);
180 mkdir_parents_label(to, 0755);
181 if (symlink(from, to) < 0) {
182 log_error("Failed to create symlink '%s' to '%s': %m", from, to);
188 to = strjoin(arg_dest, "/cryptsetup.target.requires/", n, NULL);
190 to = strjoin(arg_dest, "/cryptsetup.target.wants/", n, NULL);
194 mkdir_parents_label(to, 0755);
195 if (symlink(from, to) < 0) {
196 log_error("Failed to create symlink '%s' to '%s': %m", from, to);
201 e = unit_name_escape(name);
206 to = strjoin(arg_dest, "/dev-mapper-", e, ".device.requires/", n, NULL);
210 mkdir_parents_label(to, 0755);
211 if (symlink(from, to) < 0) {
212 log_error("Failed to create symlink '%s' to '%s': %m", from, to);
216 if (!noauto && !nofail) {
219 p = strjoin(arg_dest, "/dev-mapper-", e, ".device.d/50-job-timeout-sec-0.conf", NULL);
223 mkdir_parents_label(p, 0755);
225 r = write_string_file(p,
226 "# Automatically generated by systemd-cryptsetup-generator\n\n"
228 "JobTimeoutSec=0\n"); /* the binary handles timeouts anyway */
236 static int parse_proc_cmdline(char ***arg_proc_cmdline_disks) {
237 char _cleanup_free_ *line = NULL;
238 char *w = NULL, *state = NULL;
242 if (detect_container(NULL) > 0)
245 r = read_one_line_file("/proc/cmdline", &line);
247 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
251 FOREACH_WORD_QUOTED(w, l, line, state) {
252 char _cleanup_free_ *word = NULL;
254 word = strndup(w, l);
258 if (startswith(word, "luks=")) {
259 r = parse_boolean(word + 5);
261 log_warning("Failed to parse luks switch %s. Ignoring.", word + 5);
265 } else if (startswith(word, "rd.luks=")) {
268 r = parse_boolean(word + 8);
270 log_warning("Failed to parse luks switch %s. Ignoring.", word + 8);
275 } else if (startswith(word, "luks.crypttab=")) {
276 r = parse_boolean(word + 14);
278 log_warning("Failed to parse luks crypttab switch %s. Ignoring.", word + 14);
280 arg_read_crypttab = r;
282 } else if (startswith(word, "rd.luks.crypttab=")) {
285 r = parse_boolean(word + 17);
287 log_warning("Failed to parse luks crypttab switch %s. Ignoring.", word + 17);
289 arg_read_crypttab = r;
292 } else if (startswith(word, "luks.uuid=")) {
293 if (strv_extend(arg_proc_cmdline_disks, word + 10) < 0)
296 } else if (startswith(word, "rd.luks.uuid=")) {
299 if (strv_extend(arg_proc_cmdline_disks, word + 13) < 0)
303 } else if (startswith(word, "luks.") ||
304 (in_initrd() && startswith(word, "rd.luks."))) {
306 log_warning("Unknown kernel switch %s. Ignoring.", word);
310 strv_uniq(*arg_proc_cmdline_disks);
315 int main(int argc, char *argv[]) {
316 FILE _cleanup_fclose_ *f = NULL;
318 int r = EXIT_SUCCESS;
320 char _cleanup_strv_free_ **arg_proc_cmdline_disks_done = NULL;
321 char _cleanup_strv_free_ **arg_proc_cmdline_disks = NULL;
323 if (argc > 1 && argc != 4) {
324 log_error("This program takes three or no arguments.");
331 log_set_target(LOG_TARGET_SAFE);
332 log_parse_environment();
337 if (parse_proc_cmdline(&arg_proc_cmdline_disks) < 0)
343 if (arg_read_crypttab) {
344 f = fopen("/etc/crypttab", "re");
351 log_error("Failed to open /etc/crypttab: %m");
354 char line[LINE_MAX], *l;
355 char _cleanup_free_ *name = NULL, *device = NULL, *password = NULL, *options = NULL;
358 if (!fgets(line, sizeof(line), f))
364 if (*l == '#' || *l == 0)
367 k = sscanf(l, "%ms %ms %ms %ms", &name, &device, &password, &options);
368 if (k < 2 || k > 4) {
369 log_error("Failed to parse /etc/crypttab:%u, ignoring.", n);
374 if (arg_proc_cmdline_disks) {
376 If luks UUIDs are specified on the kernel command line, use them as a filter
377 for /etc/crypttab and only generate units for those.
379 STRV_FOREACH(i, arg_proc_cmdline_disks) {
380 char _cleanup_free_ *proc_device = NULL, *proc_name = NULL;
383 if (startswith(p, "luks-"))
386 proc_name = strappend("luks-", p);
387 proc_device = strappend("UUID=", p);
389 if (!proc_name || !proc_device)
392 if (streq(proc_device, device) || streq(proc_name, name)) {
393 if (create_disk(name, device, password, options) < 0)
396 if (strv_extend(&arg_proc_cmdline_disks_done, p) < 0)
401 if (create_disk(name, device, password, options) < 0)
407 STRV_FOREACH(i, arg_proc_cmdline_disks) {
409 Generate units for those UUIDs, which were specified
410 on the kernel command line and not yet written.
413 char _cleanup_free_ *name = NULL, *device = NULL;
416 if (startswith(p, "luks-"))
419 if (strv_contains(arg_proc_cmdline_disks_done, p))
422 name = strappend("luks-", p);
423 device = strappend("UUID=", p);
425 if (!name || !device)
428 if (create_disk(name, device, NULL, "timeout=0") < 0)