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Commit | Line | Data |
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52ad194e | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
663996b3 MS |
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 | |
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 | |
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 | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public License | |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
19 | ***/ | |
20 | ||
663996b3 | 21 | #include <errno.h> |
52ad194e | 22 | #include <stdio_ext.h> |
663996b3 | 23 | |
db2df898 | 24 | #include "alloc-util.h" |
f47781d8 | 25 | #include "dropin.h" |
db2df898 MP |
26 | #include "fd-util.h" |
27 | #include "fileio.h" | |
28 | #include "fstab-util.h" | |
f47781d8 MP |
29 | #include "generator.h" |
30 | #include "hashmap.h" | |
663996b3 | 31 | #include "log.h" |
663996b3 | 32 | #include "mkdir.h" |
db2df898 | 33 | #include "parse-util.h" |
e842803a | 34 | #include "path-util.h" |
db2df898 | 35 | #include "proc-cmdline.h" |
52ad194e | 36 | #include "specifier.h" |
db2df898 | 37 | #include "string-util.h" |
f47781d8 MP |
38 | #include "strv.h" |
39 | #include "unit-name.h" | |
40 | #include "util.h" | |
41 | ||
42 | typedef struct crypto_device { | |
43 | char *uuid; | |
44 | char *keyfile; | |
45 | char *name; | |
46 | char *options; | |
47 | bool create; | |
48 | } crypto_device; | |
663996b3 MS |
49 | |
50 | static const char *arg_dest = "/tmp"; | |
51 | static bool arg_enabled = true; | |
52 | static bool arg_read_crypttab = true; | |
f47781d8 MP |
53 | static bool arg_whitelist = false; |
54 | static Hashmap *arg_disks = NULL; | |
55 | static char *arg_default_options = NULL; | |
56 | static char *arg_default_keyfile = NULL; | |
663996b3 | 57 | |
663996b3 MS |
58 | static int create_disk( |
59 | const char *name, | |
60 | const char *device, | |
61 | const char *password, | |
62 | const char *options) { | |
63 | ||
f5e65279 | 64 | _cleanup_free_ char *p = NULL, *n = NULL, *d = NULL, *u = NULL, *e = NULL, |
52ad194e | 65 | *filtered = NULL, *u_escaped = NULL, *password_escaped = NULL, *filtered_escaped = NULL, *name_escaped = NULL; |
663996b3 | 66 | _cleanup_fclose_ FILE *f = NULL; |
f5e65279 MB |
67 | const char *dmname; |
68 | bool noauto, nofail, tmp, swap, netdev; | |
60f067b4 | 69 | int r; |
663996b3 MS |
70 | |
71 | assert(name); | |
72 | assert(device); | |
73 | ||
e735f4d4 MP |
74 | noauto = fstab_test_yes_no_option(options, "noauto\0" "auto\0"); |
75 | nofail = fstab_test_yes_no_option(options, "nofail\0" "fail\0"); | |
76 | tmp = fstab_test_option(options, "tmp\0"); | |
77 | swap = fstab_test_option(options, "swap\0"); | |
f5e65279 | 78 | netdev = fstab_test_option(options, "_netdev\0"); |
14228c0d MB |
79 | |
80 | if (tmp && swap) { | |
81 | log_error("Device '%s' cannot be both 'tmp' and 'swap'. Ignoring.", name); | |
82 | return -EINVAL; | |
83 | } | |
663996b3 | 84 | |
52ad194e MB |
85 | name_escaped = specifier_escape(name); |
86 | if (!name_escaped) | |
87 | return log_oom(); | |
88 | ||
60f067b4 JS |
89 | e = unit_name_escape(name); |
90 | if (!e) | |
91 | return log_oom(); | |
92 | ||
e3bff60a MP |
93 | r = unit_name_build("systemd-cryptsetup", e, ".service", &n); |
94 | if (r < 0) | |
95 | return log_error_errno(r, "Failed to generate unit name: %m"); | |
663996b3 | 96 | |
2897b343 | 97 | p = strjoin(arg_dest, "/", n); |
663996b3 MS |
98 | if (!p) |
99 | return log_oom(); | |
100 | ||
101 | u = fstab_node_to_udev_node(device); | |
102 | if (!u) | |
103 | return log_oom(); | |
104 | ||
52ad194e MB |
105 | u_escaped = specifier_escape(u); |
106 | if (!u_escaped) | |
107 | return log_oom(); | |
108 | ||
e3bff60a MP |
109 | r = unit_name_from_path(u, ".device", &d); |
110 | if (r < 0) | |
111 | return log_error_errno(r, "Failed to generate unit name: %m"); | |
663996b3 | 112 | |
52ad194e MB |
113 | password_escaped = specifier_escape(password); |
114 | if (!password_escaped) | |
115 | return log_oom(); | |
116 | ||
663996b3 | 117 | f = fopen(p, "wxe"); |
f47781d8 MP |
118 | if (!f) |
119 | return log_error_errno(errno, "Failed to create unit file %s: %m", p); | |
663996b3 | 120 | |
52ad194e MB |
121 | (void) __fsetlocking(f, FSETLOCKING_BYCALLER); |
122 | ||
f5e65279 MB |
123 | fprintf(f, |
124 | "# Automatically generated by systemd-cryptsetup-generator\n\n" | |
125 | "[Unit]\n" | |
126 | "Description=Cryptography Setup for %%I\n" | |
127 | "Documentation=man:crypttab(5) man:systemd-cryptsetup-generator(8) man:systemd-cryptsetup@.service(8)\n" | |
128 | "SourcePath=/etc/crypttab\n" | |
129 | "DefaultDependencies=no\n" | |
130 | "Conflicts=umount.target\n" | |
131 | "IgnoreOnIsolate=true\n" | |
132 | "After=%s\n", | |
52ad194e | 133 | netdev ? "remote-fs-pre.target" : "cryptsetup-pre.target"); |
663996b3 MS |
134 | |
135 | if (!nofail) | |
136 | fprintf(f, | |
f5e65279 MB |
137 | "Before=%s\n", |
138 | netdev ? "remote-cryptsetup.target" : "cryptsetup.target"); | |
663996b3 MS |
139 | |
140 | if (password) { | |
60f067b4 | 141 | if (STR_IN_SET(password, "/dev/urandom", "/dev/random", "/dev/hw_random")) |
52ad194e | 142 | fputs("After=systemd-random-seed.service\n", f); |
f5e65279 | 143 | else if (!STR_IN_SET(password, "-", "none")) { |
60f067b4 JS |
144 | _cleanup_free_ char *uu; |
145 | ||
146 | uu = fstab_node_to_udev_node(password); | |
147 | if (!uu) | |
148 | return log_oom(); | |
149 | ||
e842803a | 150 | if (!path_equal(uu, "/dev/null")) { |
60f067b4 | 151 | |
f5e65279 | 152 | if (path_startswith(uu, "/dev/")) { |
e3bff60a | 153 | _cleanup_free_ char *dd = NULL; |
60f067b4 | 154 | |
e3bff60a MP |
155 | r = unit_name_from_path(uu, ".device", &dd); |
156 | if (r < 0) | |
157 | return log_error_errno(r, "Failed to generate unit name: %m"); | |
e842803a MB |
158 | |
159 | fprintf(f, "After=%1$s\nRequires=%1$s\n", dd); | |
160 | } else | |
52ad194e | 161 | fprintf(f, "RequiresMountsFor=%s\n", password_escaped); |
e842803a | 162 | } |
60f067b4 | 163 | } |
663996b3 MS |
164 | } |
165 | ||
f5e65279 | 166 | if (path_startswith(u, "/dev/")) { |
663996b3 MS |
167 | fprintf(f, |
168 | "BindsTo=%s\n" | |
169 | "After=%s\n" | |
170 | "Before=umount.target\n", | |
171 | d, d); | |
2897b343 MP |
172 | |
173 | if (swap) | |
52ad194e MB |
174 | fputs("Before=dev-mapper-%i.swap\n", |
175 | f); | |
2897b343 | 176 | } else |
663996b3 MS |
177 | fprintf(f, |
178 | "RequiresMountsFor=%s\n", | |
52ad194e MB |
179 | u_escaped); |
180 | ||
663996b3 | 181 | |
e842803a MB |
182 | r = generator_write_timeouts(arg_dest, device, name, options, &filtered); |
183 | if (r < 0) | |
184 | return r; | |
185 | ||
52ad194e MB |
186 | filtered_escaped = specifier_escape(filtered); |
187 | if (!filtered_escaped) | |
188 | return log_oom(); | |
189 | ||
663996b3 MS |
190 | fprintf(f, |
191 | "\n[Service]\n" | |
192 | "Type=oneshot\n" | |
193 | "RemainAfterExit=yes\n" | |
194 | "TimeoutSec=0\n" /* the binary handles timeouts anyway */ | |
f5e65279 | 195 | "KeyringMode=shared\n" /* make sure we can share cached keys among instances */ |
663996b3 MS |
196 | "ExecStart=" SYSTEMD_CRYPTSETUP_PATH " attach '%s' '%s' '%s' '%s'\n" |
197 | "ExecStop=" SYSTEMD_CRYPTSETUP_PATH " detach '%s'\n", | |
52ad194e MB |
198 | name_escaped, u_escaped, strempty(password_escaped), strempty(filtered_escaped), |
199 | name_escaped); | |
663996b3 | 200 | |
14228c0d | 201 | if (tmp) |
663996b3 MS |
202 | fprintf(f, |
203 | "ExecStartPost=/sbin/mke2fs '/dev/mapper/%s'\n", | |
52ad194e | 204 | name_escaped); |
663996b3 | 205 | |
14228c0d | 206 | if (swap) |
663996b3 MS |
207 | fprintf(f, |
208 | "ExecStartPost=/sbin/mkswap '/dev/mapper/%s'\n", | |
52ad194e | 209 | name_escaped); |
663996b3 | 210 | |
e3bff60a MP |
211 | r = fflush_and_check(f); |
212 | if (r < 0) | |
213 | return log_error_errno(r, "Failed to write file %s: %m", p); | |
663996b3 | 214 | |
663996b3 | 215 | if (!noauto) { |
f5e65279 MB |
216 | r = generator_add_symlink(arg_dest, d, "wants", n); |
217 | if (r < 0) | |
218 | return r; | |
663996b3 | 219 | |
f5e65279 MB |
220 | r = generator_add_symlink(arg_dest, |
221 | netdev ? "remote-cryptsetup.target" : "cryptsetup.target", | |
222 | nofail ? "wants" : "requires", n); | |
223 | if (r < 0) | |
224 | return r; | |
663996b3 MS |
225 | } |
226 | ||
f5e65279 MB |
227 | dmname = strjoina("dev-mapper-", e, ".device"); |
228 | r = generator_add_symlink(arg_dest, dmname, "requires", n); | |
229 | if (r < 0) | |
230 | return r; | |
663996b3 MS |
231 | |
232 | if (!noauto && !nofail) { | |
5eef597e | 233 | r = write_drop_in(arg_dest, dmname, 90, "device-timeout", |
e842803a MB |
234 | "# Automatically generated by systemd-cryptsetup-generator \n\n" |
235 | "[Unit]\nJobTimeoutSec=0"); | |
f47781d8 MP |
236 | if (r < 0) |
237 | return log_error_errno(r, "Failed to write device drop-in: %m"); | |
238 | } | |
239 | ||
240 | return 0; | |
241 | } | |
242 | ||
52ad194e MB |
243 | static void crypt_device_free(crypto_device *d) { |
244 | free(d->uuid); | |
245 | free(d->keyfile); | |
246 | free(d->name); | |
247 | free(d->options); | |
248 | free(d); | |
f47781d8 MP |
249 | } |
250 | ||
251 | static crypto_device *get_crypto_device(const char *uuid) { | |
252 | int r; | |
253 | crypto_device *d; | |
254 | ||
255 | assert(uuid); | |
256 | ||
257 | d = hashmap_get(arg_disks, uuid); | |
258 | if (!d) { | |
259 | d = new0(struct crypto_device, 1); | |
260 | if (!d) | |
261 | return NULL; | |
262 | ||
263 | d->create = false; | |
264 | d->keyfile = d->options = d->name = NULL; | |
265 | ||
266 | d->uuid = strdup(uuid); | |
8a584da2 MP |
267 | if (!d->uuid) |
268 | return mfree(d); | |
f47781d8 MP |
269 | |
270 | r = hashmap_put(arg_disks, d->uuid, d); | |
60f067b4 | 271 | if (r < 0) { |
f47781d8 | 272 | free(d->uuid); |
8a584da2 | 273 | return mfree(d); |
60f067b4 | 274 | } |
663996b3 MS |
275 | } |
276 | ||
f47781d8 | 277 | return d; |
663996b3 MS |
278 | } |
279 | ||
8a584da2 | 280 | static int parse_proc_cmdline_item(const char *key, const char *value, void *data) { |
f47781d8 | 281 | _cleanup_free_ char *uuid = NULL, *uuid_value = NULL; |
2897b343 MP |
282 | crypto_device *d; |
283 | int r; | |
663996b3 | 284 | |
2897b343 | 285 | if (streq(key, "luks")) { |
663996b3 | 286 | |
2897b343 | 287 | r = value ? parse_boolean(value) : 1; |
60f067b4 | 288 | if (r < 0) |
2897b343 | 289 | log_warning("Failed to parse luks= kernel command line switch %s. Ignoring.", value); |
60f067b4 JS |
290 | else |
291 | arg_enabled = r; | |
663996b3 | 292 | |
2897b343 | 293 | } else if (streq(key, "luks.crypttab")) { |
14228c0d | 294 | |
2897b343 | 295 | r = value ? parse_boolean(value) : 1; |
60f067b4 | 296 | if (r < 0) |
2897b343 | 297 | log_warning("Failed to parse luks.crypttab= kernel command line switch %s. Ignoring.", value); |
60f067b4 JS |
298 | else |
299 | arg_read_crypttab = r; | |
14228c0d | 300 | |
2897b343 MP |
301 | } else if (streq(key, "luks.uuid")) { |
302 | ||
303 | if (proc_cmdline_value_missing(key, value)) | |
304 | return 0; | |
14228c0d | 305 | |
f47781d8 MP |
306 | d = get_crypto_device(startswith(value, "luks-") ? value+5 : value); |
307 | if (!d) | |
60f067b4 | 308 | return log_oom(); |
663996b3 | 309 | |
f47781d8 MP |
310 | d->create = arg_whitelist = true; |
311 | ||
2897b343 MP |
312 | } else if (streq(key, "luks.options")) { |
313 | ||
314 | if (proc_cmdline_value_missing(key, value)) | |
315 | return 0; | |
663996b3 | 316 | |
f47781d8 MP |
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 | ||
2897b343 | 323 | free_and_replace(d->options, uuid_value); |
f47781d8 | 324 | } else if (free_and_strdup(&arg_default_options, value) < 0) |
60f067b4 | 325 | return log_oom(); |
663996b3 | 326 | |
2897b343 MP |
327 | } else if (streq(key, "luks.key")) { |
328 | ||
329 | if (proc_cmdline_value_missing(key, value)) | |
330 | return 0; | |
663996b3 | 331 | |
f47781d8 MP |
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 | ||
2897b343 | 338 | free_and_replace(d->keyfile, uuid_value); |
6300502b | 339 | } else if (free_and_strdup(&arg_default_keyfile, value) < 0) |
60f067b4 | 340 | return log_oom(); |
663996b3 | 341 | |
2897b343 MP |
342 | } else if (streq(key, "luks.name")) { |
343 | ||
344 | if (proc_cmdline_value_missing(key, value)) | |
345 | return 0; | |
f47781d8 MP |
346 | |
347 | r = sscanf(value, "%m[0-9a-fA-F-]=%ms", &uuid, &uuid_value); | |
348 | if (r == 2) { | |
349 | d = get_crypto_device(uuid); | |
350 | if (!d) | |
351 | return log_oom(); | |
352 | ||
353 | d->create = arg_whitelist = true; | |
354 | ||
52ad194e | 355 | free_and_replace(d->name, uuid_value); |
f47781d8 MP |
356 | } else |
357 | log_warning("Failed to parse luks name switch %s. Ignoring.", value); | |
e842803a | 358 | } |
663996b3 MS |
359 | |
360 | return 0; | |
361 | } | |
362 | ||
f47781d8 MP |
363 | static int add_crypttab_devices(void) { |
364 | struct stat st; | |
365 | unsigned crypttab_line = 0; | |
663996b3 | 366 | _cleanup_fclose_ FILE *f = NULL; |
663996b3 | 367 | |
f47781d8 MP |
368 | if (!arg_read_crypttab) |
369 | return 0; | |
370 | ||
371 | f = fopen("/etc/crypttab", "re"); | |
372 | if (!f) { | |
373 | if (errno != ENOENT) | |
374 | log_error_errno(errno, "Failed to open /etc/crypttab: %m"); | |
375 | return 0; | |
663996b3 MS |
376 | } |
377 | ||
52ad194e MB |
378 | (void) __fsetlocking(f, FSETLOCKING_BYCALLER); |
379 | ||
f47781d8 MP |
380 | if (fstat(fileno(f), &st) < 0) { |
381 | log_error_errno(errno, "Failed to stat /etc/crypttab: %m"); | |
382 | return 0; | |
383 | } | |
663996b3 | 384 | |
f47781d8 MP |
385 | for (;;) { |
386 | int r, k; | |
387 | char line[LINE_MAX], *l, *uuid; | |
388 | crypto_device *d = NULL; | |
389 | _cleanup_free_ char *name = NULL, *device = NULL, *keyfile = NULL, *options = NULL; | |
663996b3 | 390 | |
f47781d8 MP |
391 | if (!fgets(line, sizeof(line), f)) |
392 | break; | |
60f067b4 | 393 | |
f47781d8 | 394 | crypttab_line++; |
663996b3 | 395 | |
f47781d8 | 396 | l = strstrip(line); |
f5e65279 | 397 | if (IN_SET(*l, 0, '#')) |
f47781d8 | 398 | continue; |
663996b3 | 399 | |
f47781d8 MP |
400 | k = sscanf(l, "%ms %ms %ms %ms", &name, &device, &keyfile, &options); |
401 | if (k < 2 || k > 4) { | |
402 | log_error("Failed to parse /etc/crypttab:%u, ignoring.", crypttab_line); | |
403 | continue; | |
404 | } | |
663996b3 | 405 | |
f47781d8 MP |
406 | uuid = startswith(device, "UUID="); |
407 | if (!uuid) | |
408 | uuid = path_startswith(device, "/dev/disk/by-uuid/"); | |
409 | if (!uuid) | |
410 | uuid = startswith(name, "luks-"); | |
411 | if (uuid) | |
412 | d = hashmap_get(arg_disks, uuid); | |
663996b3 | 413 | |
f47781d8 MP |
414 | if (arg_whitelist && !d) { |
415 | log_info("Not creating device '%s' because it was not specified on the kernel command line.", name); | |
416 | continue; | |
663996b3 MS |
417 | } |
418 | ||
f47781d8 MP |
419 | r = create_disk(name, device, keyfile, (d && d->options) ? d->options : options); |
420 | if (r < 0) | |
421 | return r; | |
663996b3 | 422 | |
f47781d8 MP |
423 | if (d) |
424 | d->create = false; | |
425 | } | |
663996b3 | 426 | |
f47781d8 MP |
427 | return 0; |
428 | } | |
663996b3 | 429 | |
f47781d8 MP |
430 | static int add_proc_cmdline_devices(void) { |
431 | int r; | |
432 | Iterator i; | |
433 | crypto_device *d; | |
663996b3 | 434 | |
f47781d8 MP |
435 | HASHMAP_FOREACH(d, arg_disks, i) { |
436 | const char *options; | |
437 | _cleanup_free_ char *device = NULL; | |
663996b3 | 438 | |
f47781d8 MP |
439 | if (!d->create) |
440 | continue; | |
663996b3 | 441 | |
f47781d8 MP |
442 | if (!d->name) { |
443 | d->name = strappend("luks-", d->uuid); | |
444 | if (!d->name) | |
445 | return log_oom(); | |
446 | } | |
663996b3 | 447 | |
f47781d8 MP |
448 | device = strappend("UUID=", d->uuid); |
449 | if (!device) | |
450 | return log_oom(); | |
14228c0d | 451 | |
f47781d8 MP |
452 | if (d->options) |
453 | options = d->options; | |
454 | else if (arg_default_options) | |
455 | options = arg_default_options; | |
456 | else | |
457 | options = "timeout=0"; | |
60f067b4 | 458 | |
f47781d8 MP |
459 | r = create_disk(d->name, device, d->keyfile ?: arg_default_keyfile, options); |
460 | if (r < 0) | |
461 | return r; | |
663996b3 MS |
462 | } |
463 | ||
f47781d8 MP |
464 | return 0; |
465 | } | |
663996b3 | 466 | |
f47781d8 | 467 | int main(int argc, char *argv[]) { |
2897b343 | 468 | int r; |
663996b3 | 469 | |
f47781d8 MP |
470 | if (argc > 1 && argc != 4) { |
471 | log_error("This program takes three or no arguments."); | |
472 | return EXIT_FAILURE; | |
473 | } | |
663996b3 | 474 | |
f47781d8 MP |
475 | if (argc > 1) |
476 | arg_dest = argv[1]; | |
663996b3 | 477 | |
f47781d8 MP |
478 | log_set_target(LOG_TARGET_SAFE); |
479 | log_parse_environment(); | |
480 | log_open(); | |
663996b3 | 481 | |
f47781d8 | 482 | umask(0022); |
663996b3 | 483 | |
f47781d8 | 484 | arg_disks = hashmap_new(&string_hash_ops); |
2897b343 MP |
485 | if (!arg_disks) { |
486 | r = log_oom(); | |
487 | goto finish; | |
488 | } | |
14228c0d | 489 | |
2897b343 | 490 | r = proc_cmdline_parse(parse_proc_cmdline_item, NULL, PROC_CMDLINE_STRIP_RD_PREFIX); |
f47781d8 | 491 | if (r < 0) { |
2897b343 MP |
492 | log_warning_errno(r, "Failed to parse kernel command line: %m"); |
493 | goto finish; | |
f47781d8 | 494 | } |
14228c0d | 495 | |
f47781d8 | 496 | if (!arg_enabled) { |
2897b343 MP |
497 | r = 0; |
498 | goto finish; | |
663996b3 MS |
499 | } |
500 | ||
2897b343 MP |
501 | r = add_crypttab_devices(); |
502 | if (r < 0) | |
503 | goto finish; | |
f47781d8 | 504 | |
2897b343 MP |
505 | r = add_proc_cmdline_devices(); |
506 | if (r < 0) | |
507 | goto finish; | |
f47781d8 | 508 | |
2897b343 | 509 | r = 0; |
60f067b4 | 510 | |
2897b343 | 511 | finish: |
52ad194e | 512 | hashmap_free_with_destructor(arg_disks, crypt_device_free); |
f47781d8 MP |
513 | free(arg_default_options); |
514 | free(arg_default_keyfile); | |
60f067b4 | 515 | |
2897b343 | 516 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
663996b3 | 517 | } |