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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
e23a0ce8 LP |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2010 Lennart Poettering | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
8 | under the terms of the GNU Lesser General Public License as published by |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
e23a0ce8 LP |
10 | (at your option) any later version. |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 15 | Lesser General Public License for more details. |
e23a0ce8 | 16 | |
5430f7f2 | 17 | You should have received a copy of the GNU Lesser General Public License |
e23a0ce8 LP |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
19 | ***/ | |
20 | ||
e23a0ce8 | 21 | #include <errno.h> |
e23a0ce8 | 22 | |
b5efdb8a | 23 | #include "alloc-util.h" |
0fa9e53d | 24 | #include "dropin.h" |
3ffd4af2 | 25 | #include "fd-util.h" |
0d39fa9c | 26 | #include "fileio.h" |
07630cea | 27 | #include "fstab-util.h" |
0fa9e53d JJ |
28 | #include "generator.h" |
29 | #include "hashmap.h" | |
e23a0ce8 | 30 | #include "log.h" |
49e942b2 | 31 | #include "mkdir.h" |
6bedfcbb | 32 | #include "parse-util.h" |
bde29068 | 33 | #include "path-util.h" |
4e731273 | 34 | #include "proc-cmdline.h" |
07630cea | 35 | #include "string-util.h" |
0fa9e53d JJ |
36 | #include "strv.h" |
37 | #include "unit-name.h" | |
38 | #include "util.h" | |
39 | ||
40 | typedef struct crypto_device { | |
41 | char *uuid; | |
6cd5b12a | 42 | char *keyfile; |
baade8cc | 43 | char *name; |
0fa9e53d JJ |
44 | char *options; |
45 | bool create; | |
46 | } crypto_device; | |
e23a0ce8 | 47 | |
66a78c2b LP |
48 | static const char *arg_dest = "/tmp"; |
49 | static bool arg_enabled = true; | |
50 | static bool arg_read_crypttab = true; | |
0fa9e53d JJ |
51 | static bool arg_whitelist = false; |
52 | static Hashmap *arg_disks = NULL; | |
53 | static char *arg_default_options = NULL; | |
54 | static char *arg_default_keyfile = NULL; | |
141a79f4 | 55 | |
e23a0ce8 LP |
56 | static int create_disk( |
57 | const char *name, | |
58 | const char *device, | |
59 | const char *password, | |
60 | const char *options) { | |
61 | ||
b559616f | 62 | _cleanup_free_ char *p = NULL, *n = NULL, *d = NULL, *u = NULL, *e = NULL, |
8eea8687 | 63 | *filtered = NULL; |
7fd1b19b | 64 | _cleanup_fclose_ FILE *f = NULL; |
b559616f | 65 | const char *dmname; |
b001ad61 | 66 | bool noauto, nofail, tmp, swap, netdev; |
744198e9 | 67 | int r; |
e23a0ce8 LP |
68 | |
69 | assert(name); | |
70 | assert(device); | |
71 | ||
b9f111b9 ZJS |
72 | noauto = fstab_test_yes_no_option(options, "noauto\0" "auto\0"); |
73 | nofail = fstab_test_yes_no_option(options, "nofail\0" "fail\0"); | |
a6dba978 ZJS |
74 | tmp = fstab_test_option(options, "tmp\0"); |
75 | swap = fstab_test_option(options, "swap\0"); | |
b001ad61 | 76 | netdev = fstab_test_option(options, "_netdev\0"); |
8c11d3c1 TG |
77 | |
78 | if (tmp && swap) { | |
79 | log_error("Device '%s' cannot be both 'tmp' and 'swap'. Ignoring.", name); | |
80 | return -EINVAL; | |
81 | } | |
155da457 | 82 | |
744198e9 LP |
83 | e = unit_name_escape(name); |
84 | if (!e) | |
85 | return log_oom(); | |
86 | ||
7410616c LP |
87 | r = unit_name_build("systemd-cryptsetup", e, ".service", &n); |
88 | if (r < 0) | |
89 | return log_error_errno(r, "Failed to generate unit name: %m"); | |
e23a0ce8 | 90 | |
605405c6 | 91 | p = strjoin(arg_dest, "/", n); |
24a988e9 HH |
92 | if (!p) |
93 | return log_oom(); | |
e23a0ce8 | 94 | |
f7f21d33 | 95 | u = fstab_node_to_udev_node(device); |
24a988e9 HH |
96 | if (!u) |
97 | return log_oom(); | |
e23a0ce8 | 98 | |
7410616c LP |
99 | r = unit_name_from_path(u, ".device", &d); |
100 | if (r < 0) | |
101 | return log_error_errno(r, "Failed to generate unit name: %m"); | |
e23a0ce8 | 102 | |
f7f21d33 | 103 | f = fopen(p, "wxe"); |
4a62c710 MS |
104 | if (!f) |
105 | return log_error_errno(errno, "Failed to create unit file %s: %m", p); | |
e23a0ce8 | 106 | |
b001ad61 ZJS |
107 | fprintf(f, |
108 | "# Automatically generated by systemd-cryptsetup-generator\n\n" | |
109 | "[Unit]\n" | |
110 | "Description=Cryptography Setup for %%I\n" | |
111 | "Documentation=man:crypttab(5) man:systemd-cryptsetup-generator(8) man:systemd-cryptsetup@.service(8)\n" | |
112 | "SourcePath=/etc/crypttab\n" | |
113 | "DefaultDependencies=no\n" | |
114 | "Conflicts=umount.target\n" | |
115 | "IgnoreOnIsolate=true\n" | |
116 | "After=%s\n", | |
a0dd2097 | 117 | netdev ? "remote-fs-pre.target" : "cryptsetup-pre.target"); |
e23a0ce8 | 118 | |
155da457 LP |
119 | if (!nofail) |
120 | fprintf(f, | |
b001ad61 ZJS |
121 | "Before=%s\n", |
122 | netdev ? "remote-cryptsetup.target" : "cryptsetup.target"); | |
155da457 | 123 | |
ceca9501 | 124 | if (password) { |
744198e9 | 125 | if (STR_IN_SET(password, "/dev/urandom", "/dev/random", "/dev/hw_random")) |
4b61c875 | 126 | fputs_unlocked("After=systemd-random-seed.service\n", f); |
b559616f | 127 | else if (!STR_IN_SET(password, "-", "none")) { |
744198e9 LP |
128 | _cleanup_free_ char *uu; |
129 | ||
130 | uu = fstab_node_to_udev_node(password); | |
131 | if (!uu) | |
66a5dbdf DR |
132 | return log_oom(); |
133 | ||
bde29068 | 134 | if (!path_equal(uu, "/dev/null")) { |
744198e9 | 135 | |
048dd629 | 136 | if (path_startswith(uu, "/dev/")) { |
7410616c | 137 | _cleanup_free_ char *dd = NULL; |
66a5dbdf | 138 | |
7410616c LP |
139 | r = unit_name_from_path(uu, ".device", &dd); |
140 | if (r < 0) | |
141 | return log_error_errno(r, "Failed to generate unit name: %m"); | |
bde29068 LP |
142 | |
143 | fprintf(f, "After=%1$s\nRequires=%1$s\n", dd); | |
144 | } else | |
145 | fprintf(f, "RequiresMountsFor=%s\n", password); | |
146 | } | |
66a5dbdf | 147 | } |
ceca9501 | 148 | } |
e23a0ce8 | 149 | |
048dd629 | 150 | if (path_startswith(u, "/dev/")) { |
9ece938a TW |
151 | fprintf(f, |
152 | "BindsTo=%s\n" | |
153 | "After=%s\n" | |
154 | "Before=umount.target\n", | |
155 | d, d); | |
a6f8786a MFO |
156 | |
157 | if (swap) | |
4b61c875 LP |
158 | fputs_unlocked("Before=dev-mapper-%i.swap\n", |
159 | f); | |
a6f8786a | 160 | } else |
9ece938a TW |
161 | fprintf(f, |
162 | "RequiresMountsFor=%s\n", | |
163 | u); | |
164 | ||
8eea8687 ZJS |
165 | r = generator_write_timeouts(arg_dest, device, name, options, &filtered); |
166 | if (r < 0) | |
167 | return r; | |
168 | ||
e23a0ce8 LP |
169 | fprintf(f, |
170 | "\n[Service]\n" | |
171 | "Type=oneshot\n" | |
172 | "RemainAfterExit=yes\n" | |
90724929 | 173 | "TimeoutSec=0\n" /* the binary handles timeouts anyway */ |
0b1f68ac | 174 | "KeyringMode=shared\n" /* make sure we can share cached keys among instances */ |
260ab287 | 175 | "ExecStart=" SYSTEMD_CRYPTSETUP_PATH " attach '%s' '%s' '%s' '%s'\n" |
7f4e0805 | 176 | "ExecStop=" SYSTEMD_CRYPTSETUP_PATH " detach '%s'\n", |
8eea8687 | 177 | name, u, strempty(password), strempty(filtered), |
e23a0ce8 LP |
178 | name); |
179 | ||
8c11d3c1 | 180 | if (tmp) |
e23a0ce8 | 181 | fprintf(f, |
50109038 | 182 | "ExecStartPost=/sbin/mke2fs '/dev/mapper/%s'\n", |
1d3399e6 | 183 | name); |
e23a0ce8 | 184 | |
8c11d3c1 | 185 | if (swap) |
e23a0ce8 | 186 | fprintf(f, |
50109038 | 187 | "ExecStartPost=/sbin/mkswap '/dev/mapper/%s'\n", |
1d3399e6 | 188 | name); |
e23a0ce8 | 189 | |
4652c56c ZJS |
190 | r = fflush_and_check(f); |
191 | if (r < 0) | |
192 | return log_error_errno(r, "Failed to write file %s: %m", p); | |
e23a0ce8 | 193 | |
155da457 | 194 | if (!noauto) { |
b559616f ZJS |
195 | r = generator_add_symlink(arg_dest, d, "wants", n); |
196 | if (r < 0) | |
197 | return r; | |
e23a0ce8 | 198 | |
b001ad61 ZJS |
199 | r = generator_add_symlink(arg_dest, |
200 | netdev ? "remote-cryptsetup.target" : "cryptsetup.target", | |
b559616f ZJS |
201 | nofail ? "wants" : "requires", n); |
202 | if (r < 0) | |
203 | return r; | |
f7f21d33 | 204 | } |
74715b82 | 205 | |
b559616f ZJS |
206 | dmname = strjoina("dev-mapper-", e, ".device"); |
207 | r = generator_add_symlink(arg_dest, dmname, "requires", n); | |
208 | if (r < 0) | |
209 | return r; | |
74715b82 | 210 | |
68395007 | 211 | if (!noauto && !nofail) { |
a6fb0dc1 | 212 | r = write_drop_in(arg_dest, dmname, 90, "device-timeout", |
8eea8687 ZJS |
213 | "# Automatically generated by systemd-cryptsetup-generator \n\n" |
214 | "[Unit]\nJobTimeoutSec=0"); | |
23bbb0de MS |
215 | if (r < 0) |
216 | return log_error_errno(r, "Failed to write device drop-in: %m"); | |
68395007 HH |
217 | } |
218 | ||
24a988e9 | 219 | return 0; |
e23a0ce8 LP |
220 | } |
221 | ||
0fa9e53d JJ |
222 | static void free_arg_disks(void) { |
223 | crypto_device *d; | |
224 | ||
225 | while ((d = hashmap_steal_first(arg_disks))) { | |
226 | free(d->uuid); | |
6cd5b12a | 227 | free(d->keyfile); |
baade8cc | 228 | free(d->name); |
0fa9e53d JJ |
229 | free(d->options); |
230 | free(d); | |
231 | } | |
232 | ||
233 | hashmap_free(arg_disks); | |
234 | } | |
235 | ||
236 | static crypto_device *get_crypto_device(const char *uuid) { | |
237 | int r; | |
238 | crypto_device *d; | |
239 | ||
240 | assert(uuid); | |
241 | ||
242 | d = hashmap_get(arg_disks, uuid); | |
243 | if (!d) { | |
244 | d = new0(struct crypto_device, 1); | |
245 | if (!d) | |
246 | return NULL; | |
247 | ||
248 | d->create = false; | |
baade8cc | 249 | d->keyfile = d->options = d->name = NULL; |
0fa9e53d JJ |
250 | |
251 | d->uuid = strdup(uuid); | |
6b430fdb ZJS |
252 | if (!d->uuid) |
253 | return mfree(d); | |
0fa9e53d JJ |
254 | |
255 | r = hashmap_put(arg_disks, d->uuid, d); | |
256 | if (r < 0) { | |
257 | free(d->uuid); | |
6b430fdb | 258 | return mfree(d); |
0fa9e53d JJ |
259 | } |
260 | } | |
261 | ||
262 | return d; | |
263 | } | |
264 | ||
96287a49 | 265 | static int parse_proc_cmdline_item(const char *key, const char *value, void *data) { |
0fa9e53d | 266 | _cleanup_free_ char *uuid = NULL, *uuid_value = NULL; |
1d84ad94 LP |
267 | crypto_device *d; |
268 | int r; | |
66a78c2b | 269 | |
1d84ad94 | 270 | if (streq(key, "luks")) { |
059cb385 | 271 | |
1d84ad94 | 272 | r = value ? parse_boolean(value) : 1; |
141a79f4 | 273 | if (r < 0) |
1d84ad94 | 274 | log_warning("Failed to parse luks= kernel command line switch %s. Ignoring.", value); |
141a79f4 ZJS |
275 | else |
276 | arg_enabled = r; | |
66a78c2b | 277 | |
1d84ad94 | 278 | } else if (streq(key, "luks.crypttab")) { |
66a78c2b | 279 | |
1d84ad94 | 280 | r = value ? parse_boolean(value) : 1; |
141a79f4 | 281 | if (r < 0) |
1d84ad94 | 282 | log_warning("Failed to parse luks.crypttab= kernel command line switch %s. Ignoring.", value); |
141a79f4 ZJS |
283 | else |
284 | arg_read_crypttab = r; | |
66a78c2b | 285 | |
1d84ad94 LP |
286 | } else if (streq(key, "luks.uuid")) { |
287 | ||
288 | if (proc_cmdline_value_missing(key, value)) | |
289 | return 0; | |
66a78c2b | 290 | |
0fa9e53d JJ |
291 | d = get_crypto_device(startswith(value, "luks-") ? value+5 : value); |
292 | if (!d) | |
141a79f4 | 293 | return log_oom(); |
66a78c2b | 294 | |
0fa9e53d JJ |
295 | d->create = arg_whitelist = true; |
296 | ||
1d84ad94 LP |
297 | } else if (streq(key, "luks.options")) { |
298 | ||
299 | if (proc_cmdline_value_missing(key, value)) | |
300 | return 0; | |
66a78c2b | 301 | |
0fa9e53d JJ |
302 | r = sscanf(value, "%m[0-9a-fA-F-]=%ms", &uuid, &uuid_value); |
303 | if (r == 2) { | |
304 | d = get_crypto_device(uuid); | |
305 | if (!d) | |
306 | return log_oom(); | |
307 | ||
1d84ad94 | 308 | free_and_replace(d->options, uuid_value); |
0fa9e53d | 309 | } else if (free_and_strdup(&arg_default_options, value) < 0) |
141a79f4 | 310 | return log_oom(); |
66a78c2b | 311 | |
1d84ad94 LP |
312 | } else if (streq(key, "luks.key")) { |
313 | ||
314 | if (proc_cmdline_value_missing(key, value)) | |
315 | return 0; | |
66a78c2b | 316 | |
6cd5b12a JJ |
317 | r = sscanf(value, "%m[0-9a-fA-F-]=%ms", &uuid, &uuid_value); |
318 | if (r == 2) { | |
319 | d = get_crypto_device(uuid); | |
320 | if (!d) | |
321 | return log_oom(); | |
322 | ||
1d84ad94 | 323 | free_and_replace(d->keyfile, uuid_value); |
c802a730 | 324 | } else if (free_and_strdup(&arg_default_keyfile, value) < 0) |
141a79f4 | 325 | return log_oom(); |
7ab064a6 | 326 | |
1d84ad94 LP |
327 | } else if (streq(key, "luks.name")) { |
328 | ||
329 | if (proc_cmdline_value_missing(key, value)) | |
330 | return 0; | |
baade8cc JJ |
331 | |
332 | r = sscanf(value, "%m[0-9a-fA-F-]=%ms", &uuid, &uuid_value); | |
333 | if (r == 2) { | |
334 | d = get_crypto_device(uuid); | |
335 | if (!d) | |
336 | return log_oom(); | |
337 | ||
338 | d->create = arg_whitelist = true; | |
339 | ||
340 | free(d->name); | |
341 | d->name = uuid_value; | |
342 | uuid_value = NULL; | |
343 | } else | |
344 | log_warning("Failed to parse luks name switch %s. Ignoring.", value); | |
85013844 | 345 | } |
66a78c2b | 346 | |
24a988e9 | 347 | return 0; |
66a78c2b LP |
348 | } |
349 | ||
0fa9e53d JJ |
350 | static int add_crypttab_devices(void) { |
351 | struct stat st; | |
352 | unsigned crypttab_line = 0; | |
7fd1b19b | 353 | _cleanup_fclose_ FILE *f = NULL; |
e23a0ce8 | 354 | |
0fa9e53d JJ |
355 | if (!arg_read_crypttab) |
356 | return 0; | |
357 | ||
358 | f = fopen("/etc/crypttab", "re"); | |
359 | if (!f) { | |
360 | if (errno != ENOENT) | |
361 | log_error_errno(errno, "Failed to open /etc/crypttab: %m"); | |
362 | return 0; | |
e23a0ce8 LP |
363 | } |
364 | ||
0fa9e53d JJ |
365 | if (fstat(fileno(f), &st) < 0) { |
366 | log_error_errno(errno, "Failed to stat /etc/crypttab: %m"); | |
367 | return 0; | |
368 | } | |
e23a0ce8 | 369 | |
0fa9e53d JJ |
370 | for (;;) { |
371 | int r, k; | |
372 | char line[LINE_MAX], *l, *uuid; | |
373 | crypto_device *d = NULL; | |
374 | _cleanup_free_ char *name = NULL, *device = NULL, *keyfile = NULL, *options = NULL; | |
4c12626c | 375 | |
0fa9e53d JJ |
376 | if (!fgets(line, sizeof(line), f)) |
377 | break; | |
66a78c2b | 378 | |
0fa9e53d | 379 | crypttab_line++; |
141a79f4 | 380 | |
0fa9e53d | 381 | l = strstrip(line); |
4c701096 | 382 | if (IN_SET(*l, 0, '#')) |
0fa9e53d | 383 | continue; |
66a78c2b | 384 | |
0fa9e53d JJ |
385 | k = sscanf(l, "%ms %ms %ms %ms", &name, &device, &keyfile, &options); |
386 | if (k < 2 || k > 4) { | |
387 | log_error("Failed to parse /etc/crypttab:%u, ignoring.", crypttab_line); | |
388 | continue; | |
389 | } | |
66a78c2b | 390 | |
0fa9e53d JJ |
391 | uuid = startswith(device, "UUID="); |
392 | if (!uuid) | |
393 | uuid = path_startswith(device, "/dev/disk/by-uuid/"); | |
394 | if (!uuid) | |
395 | uuid = startswith(name, "luks-"); | |
396 | if (uuid) | |
397 | d = hashmap_get(arg_disks, uuid); | |
8973790e | 398 | |
0fa9e53d JJ |
399 | if (arg_whitelist && !d) { |
400 | log_info("Not creating device '%s' because it was not specified on the kernel command line.", name); | |
401 | continue; | |
8973790e LP |
402 | } |
403 | ||
0fa9e53d JJ |
404 | r = create_disk(name, device, keyfile, (d && d->options) ? d->options : options); |
405 | if (r < 0) | |
406 | return r; | |
8973790e | 407 | |
0fa9e53d JJ |
408 | if (d) |
409 | d->create = false; | |
410 | } | |
8973790e | 411 | |
0fa9e53d JJ |
412 | return 0; |
413 | } | |
66a78c2b | 414 | |
0fa9e53d JJ |
415 | static int add_proc_cmdline_devices(void) { |
416 | int r; | |
417 | Iterator i; | |
418 | crypto_device *d; | |
66a78c2b | 419 | |
0fa9e53d JJ |
420 | HASHMAP_FOREACH(d, arg_disks, i) { |
421 | const char *options; | |
baade8cc | 422 | _cleanup_free_ char *device = NULL; |
66a78c2b | 423 | |
0fa9e53d JJ |
424 | if (!d->create) |
425 | continue; | |
e23a0ce8 | 426 | |
baade8cc JJ |
427 | if (!d->name) { |
428 | d->name = strappend("luks-", d->uuid); | |
429 | if (!d->name) | |
430 | return log_oom(); | |
431 | } | |
e23a0ce8 | 432 | |
0fa9e53d JJ |
433 | device = strappend("UUID=", d->uuid); |
434 | if (!device) | |
435 | return log_oom(); | |
7ab064a6 | 436 | |
0fa9e53d JJ |
437 | if (d->options) |
438 | options = d->options; | |
439 | else if (arg_default_options) | |
440 | options = arg_default_options; | |
441 | else | |
442 | options = "timeout=0"; | |
141a79f4 | 443 | |
baade8cc | 444 | r = create_disk(d->name, device, d->keyfile ?: arg_default_keyfile, options); |
0fa9e53d JJ |
445 | if (r < 0) |
446 | return r; | |
e23a0ce8 LP |
447 | } |
448 | ||
0fa9e53d JJ |
449 | return 0; |
450 | } | |
e23a0ce8 | 451 | |
0fa9e53d | 452 | int main(int argc, char *argv[]) { |
5f4bfe56 | 453 | int r; |
e23a0ce8 | 454 | |
0fa9e53d JJ |
455 | if (argc > 1 && argc != 4) { |
456 | log_error("This program takes three or no arguments."); | |
457 | return EXIT_FAILURE; | |
458 | } | |
e23a0ce8 | 459 | |
0fa9e53d JJ |
460 | if (argc > 1) |
461 | arg_dest = argv[1]; | |
e23a0ce8 | 462 | |
0fa9e53d JJ |
463 | log_set_target(LOG_TARGET_SAFE); |
464 | log_parse_environment(); | |
465 | log_open(); | |
e2cb60fa | 466 | |
0fa9e53d | 467 | umask(0022); |
e23a0ce8 | 468 | |
0fa9e53d | 469 | arg_disks = hashmap_new(&string_hash_ops); |
5f4bfe56 LP |
470 | if (!arg_disks) { |
471 | r = log_oom(); | |
472 | goto finish; | |
473 | } | |
7ab064a6 | 474 | |
1d84ad94 | 475 | r = proc_cmdline_parse(parse_proc_cmdline_item, NULL, PROC_CMDLINE_STRIP_RD_PREFIX); |
0fa9e53d | 476 | if (r < 0) { |
5f4bfe56 LP |
477 | log_warning_errno(r, "Failed to parse kernel command line: %m"); |
478 | goto finish; | |
0fa9e53d | 479 | } |
7ab064a6 | 480 | |
0fa9e53d | 481 | if (!arg_enabled) { |
5f4bfe56 LP |
482 | r = 0; |
483 | goto finish; | |
e23a0ce8 LP |
484 | } |
485 | ||
5f4bfe56 LP |
486 | r = add_crypttab_devices(); |
487 | if (r < 0) | |
488 | goto finish; | |
0fa9e53d | 489 | |
5f4bfe56 LP |
490 | r = add_proc_cmdline_devices(); |
491 | if (r < 0) | |
492 | goto finish; | |
0fa9e53d | 493 | |
5f4bfe56 | 494 | r = 0; |
141a79f4 | 495 | |
5f4bfe56 | 496 | finish: |
0fa9e53d JJ |
497 | free_arg_disks(); |
498 | free(arg_default_options); | |
499 | free(arg_default_keyfile); | |
141a79f4 | 500 | |
5f4bfe56 | 501 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
e23a0ce8 | 502 | } |