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