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git.ipfire.org Git - thirdparty/systemd.git/blob - src/cryptsetup/cryptsetup-generator.c
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 "generator.h"
32 #include "path-util.h"
33 #include "fstab-util.h"
35 #include "unit-name.h"
38 typedef struct crypto_device
{
46 static const char *arg_dest
= "/tmp";
47 static bool arg_enabled
= true;
48 static bool arg_read_crypttab
= true;
49 static bool arg_whitelist
= false;
50 static Hashmap
*arg_disks
= NULL
;
51 static char *arg_default_options
= NULL
;
52 static char *arg_default_keyfile
= NULL
;
54 static int create_disk(
58 const char *options
) {
60 _cleanup_free_
char *p
= NULL
, *n
= NULL
, *d
= NULL
, *u
= NULL
, *to
= NULL
, *e
= NULL
,
62 _cleanup_fclose_
FILE *f
= NULL
;
63 bool noauto
, nofail
, tmp
, swap
;
70 noauto
= fstab_test_yes_no_option(options
, "noauto\0" "auto\0");
71 nofail
= fstab_test_yes_no_option(options
, "nofail\0" "fail\0");
72 tmp
= fstab_test_option(options
, "tmp\0");
73 swap
= fstab_test_option(options
, "swap\0");
76 log_error("Device '%s' cannot be both 'tmp' and 'swap'. Ignoring.", name
);
80 e
= unit_name_escape(name
);
84 n
= unit_name_build("systemd-cryptsetup", e
, ".service");
88 p
= strjoin(arg_dest
, "/", n
, NULL
);
92 u
= fstab_node_to_udev_node(device
);
96 d
= unit_name_from_path(u
, ".device");
102 return log_error_errno(errno
, "Failed to create unit file %s: %m", p
);
105 "# Automatically generated by systemd-cryptsetup-generator\n\n"
107 "Description=Cryptography Setup for %I\n"
108 "Documentation=man:crypttab(5) man:systemd-cryptsetup-generator(8) man:systemd-cryptsetup@.service(8)\n"
109 "SourcePath=/etc/crypttab\n"
110 "DefaultDependencies=no\n"
111 "Conflicts=umount.target\n"
112 "BindsTo=dev-mapper-%i.device\n"
113 "IgnoreOnIsolate=true\n"
114 "After=cryptsetup-pre.target\n",
119 "Before=cryptsetup.target\n");
122 if (STR_IN_SET(password
, "/dev/urandom", "/dev/random", "/dev/hw_random"))
123 fputs("After=systemd-random-seed.service\n", f
);
124 else if (!streq(password
, "-") && !streq(password
, "none")) {
125 _cleanup_free_
char *uu
;
127 uu
= fstab_node_to_udev_node(password
);
131 if (!path_equal(uu
, "/dev/null")) {
133 if (is_device_path(uu
)) {
134 _cleanup_free_
char *dd
;
136 dd
= unit_name_from_path(uu
, ".device");
140 fprintf(f
, "After=%1$s\nRequires=%1$s\n", dd
);
142 fprintf(f
, "RequiresMountsFor=%s\n", password
);
147 if (is_device_path(u
))
151 "Before=umount.target\n",
155 "RequiresMountsFor=%s\n",
158 r
= generator_write_timeouts(arg_dest
, device
, name
, options
, &filtered
);
165 "RemainAfterExit=yes\n"
166 "TimeoutSec=0\n" /* the binary handles timeouts anyway */
167 "ExecStart=" SYSTEMD_CRYPTSETUP_PATH
" attach '%s' '%s' '%s' '%s'\n"
168 "ExecStop=" SYSTEMD_CRYPTSETUP_PATH
" detach '%s'\n",
169 name
, u
, strempty(password
), strempty(filtered
),
174 "ExecStartPost=/sbin/mke2fs '/dev/mapper/%s'\n",
179 "ExecStartPost=/sbin/mkswap '/dev/mapper/%s'\n",
184 return log_error_errno(errno
, "Failed to write file %s: %m", p
);
186 from
= strappenda("../", n
);
190 to
= strjoin(arg_dest
, "/", d
, ".wants/", n
, NULL
);
194 mkdir_parents_label(to
, 0755);
195 if (symlink(from
, to
) < 0)
196 return log_error_errno(errno
, "Failed to create symlink %s: %m", to
);
200 to
= strjoin(arg_dest
, "/cryptsetup.target.requires/", n
, NULL
);
202 to
= strjoin(arg_dest
, "/cryptsetup.target.wants/", n
, NULL
);
206 mkdir_parents_label(to
, 0755);
207 if (symlink(from
, to
) < 0)
208 return log_error_errno(errno
, "Failed to create symlink %s: %m", to
);
212 to
= strjoin(arg_dest
, "/dev-mapper-", e
, ".device.requires/", n
, NULL
);
216 mkdir_parents_label(to
, 0755);
217 if (symlink(from
, to
) < 0)
218 return log_error_errno(errno
, "Failed to create symlink %s: %m", to
);
220 if (!noauto
&& !nofail
) {
221 _cleanup_free_
char *dmname
;
222 dmname
= strjoin("dev-mapper-", e
, ".device", NULL
);
226 r
= write_drop_in(arg_dest
, dmname
, 90, "device-timeout",
227 "# Automatically generated by systemd-cryptsetup-generator \n\n"
228 "[Unit]\nJobTimeoutSec=0");
230 return log_error_errno(r
, "Failed to write device drop-in: %m");
236 static void free_arg_disks(void) {
239 while ((d
= hashmap_steal_first(arg_disks
))) {
247 hashmap_free(arg_disks
);
250 static crypto_device
*get_crypto_device(const char *uuid
) {
256 d
= hashmap_get(arg_disks
, uuid
);
258 d
= new0(struct crypto_device
, 1);
263 d
->keyfile
= d
->options
= d
->name
= NULL
;
265 d
->uuid
= strdup(uuid
);
271 r
= hashmap_put(arg_disks
, d
->uuid
, d
);
282 static int parse_proc_cmdline_item(const char *key
, const char *value
) {
285 _cleanup_free_
char *uuid
= NULL
, *uuid_value
= NULL
;
287 if (STR_IN_SET(key
, "luks", "rd.luks") && value
) {
289 r
= parse_boolean(value
);
291 log_warning("Failed to parse luks switch %s. Ignoring.", value
);
295 } else if (STR_IN_SET(key
, "luks.crypttab", "rd.luks.crypttab") && value
) {
297 r
= parse_boolean(value
);
299 log_warning("Failed to parse luks crypttab switch %s. Ignoring.", value
);
301 arg_read_crypttab
= r
;
303 } else if (STR_IN_SET(key
, "luks.uuid", "rd.luks.uuid") && value
) {
305 d
= get_crypto_device(startswith(value
, "luks-") ? value
+5 : value
);
309 d
->create
= arg_whitelist
= true;
311 } else if (STR_IN_SET(key
, "luks.options", "rd.luks.options") && value
) {
313 r
= sscanf(value
, "%m[0-9a-fA-F-]=%ms", &uuid
, &uuid_value
);
315 d
= get_crypto_device(uuid
);
320 d
->options
= uuid_value
;
322 } else if (free_and_strdup(&arg_default_options
, value
) < 0)
325 } else if (STR_IN_SET(key
, "luks.key", "rd.luks.key") && value
) {
327 r
= sscanf(value
, "%m[0-9a-fA-F-]=%ms", &uuid
, &uuid_value
);
329 d
= get_crypto_device(uuid
);
334 d
->keyfile
= uuid_value
;
336 } else if (free_and_strdup(&arg_default_keyfile
, value
))
339 } else if (STR_IN_SET(key
, "luks.name", "rd.luks.name") && value
) {
341 r
= sscanf(value
, "%m[0-9a-fA-F-]=%ms", &uuid
, &uuid_value
);
343 d
= get_crypto_device(uuid
);
347 d
->create
= arg_whitelist
= true;
350 d
->name
= uuid_value
;
353 log_warning("Failed to parse luks name switch %s. Ignoring.", value
);
360 static int add_crypttab_devices(void) {
362 unsigned crypttab_line
= 0;
363 _cleanup_fclose_
FILE *f
= NULL
;
365 if (!arg_read_crypttab
)
368 f
= fopen("/etc/crypttab", "re");
371 log_error_errno(errno
, "Failed to open /etc/crypttab: %m");
375 if (fstat(fileno(f
), &st
) < 0) {
376 log_error_errno(errno
, "Failed to stat /etc/crypttab: %m");
380 /* If we readd support for specifying passphrases
381 * directly in crypttab we should upgrade the warning
382 * below, though possibly only if a passphrase is
383 * specified directly. */
384 if (st
.st_mode
& 0005)
385 log_debug("/etc/crypttab is world-readable. This is usually not a good idea.");
389 char line
[LINE_MAX
], *l
, *uuid
;
390 crypto_device
*d
= NULL
;
391 _cleanup_free_
char *name
= NULL
, *device
= NULL
, *keyfile
= NULL
, *options
= NULL
;
393 if (!fgets(line
, sizeof(line
), f
))
399 if (*l
== '#' || *l
== 0)
402 k
= sscanf(l
, "%ms %ms %ms %ms", &name
, &device
, &keyfile
, &options
);
403 if (k
< 2 || k
> 4) {
404 log_error("Failed to parse /etc/crypttab:%u, ignoring.", crypttab_line
);
408 uuid
= startswith(device
, "UUID=");
410 uuid
= path_startswith(device
, "/dev/disk/by-uuid/");
412 uuid
= startswith(name
, "luks-");
414 d
= hashmap_get(arg_disks
, uuid
);
416 if (arg_whitelist
&& !d
) {
417 log_info("Not creating device '%s' because it was not specified on the kernel command line.", name
);
421 r
= create_disk(name
, device
, keyfile
, (d
&& d
->options
) ? d
->options
: options
);
432 static int add_proc_cmdline_devices(void) {
437 HASHMAP_FOREACH(d
, arg_disks
, i
) {
439 _cleanup_free_
char *device
= NULL
;
445 d
->name
= strappend("luks-", d
->uuid
);
450 device
= strappend("UUID=", d
->uuid
);
455 options
= d
->options
;
456 else if (arg_default_options
)
457 options
= arg_default_options
;
459 options
= "timeout=0";
461 r
= create_disk(d
->name
, device
, d
->keyfile
?: arg_default_keyfile
, options
);
469 int main(int argc
, char *argv
[]) {
470 int r
= EXIT_FAILURE
;
472 if (argc
> 1 && argc
!= 4) {
473 log_error("This program takes three or no arguments.");
480 log_set_target(LOG_TARGET_SAFE
);
481 log_parse_environment();
486 arg_disks
= hashmap_new(&string_hash_ops
);
490 r
= parse_proc_cmdline(parse_proc_cmdline_item
);
492 log_warning_errno(r
, "Failed to parse kernel command line, ignoring: %m");
501 if (add_crypttab_devices() < 0)
504 if (add_proc_cmdline_devices() < 0)
511 free(arg_default_options
);
512 free(arg_default_keyfile
);