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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 | ||
8eea8687 ZJS |
61 | _cleanup_free_ char *p = NULL, *n = NULL, *d = NULL, *u = NULL, *to = NULL, *e = NULL, |
62 | *filtered = NULL; | |
7fd1b19b | 63 | _cleanup_fclose_ FILE *f = NULL; |
8c11d3c1 | 64 | bool noauto, nofail, tmp, swap; |
744198e9 LP |
65 | char *from; |
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"); | |
8c11d3c1 TG |
75 | |
76 | if (tmp && swap) { | |
77 | log_error("Device '%s' cannot be both 'tmp' and 'swap'. Ignoring.", name); | |
78 | return -EINVAL; | |
79 | } | |
155da457 | 80 | |
744198e9 LP |
81 | e = unit_name_escape(name); |
82 | if (!e) | |
83 | return log_oom(); | |
84 | ||
7410616c LP |
85 | r = unit_name_build("systemd-cryptsetup", e, ".service", &n); |
86 | if (r < 0) | |
87 | return log_error_errno(r, "Failed to generate unit name: %m"); | |
e23a0ce8 | 88 | |
b7def684 | 89 | p = strjoin(arg_dest, "/", n, NULL); |
24a988e9 HH |
90 | if (!p) |
91 | return log_oom(); | |
e23a0ce8 | 92 | |
f7f21d33 | 93 | u = fstab_node_to_udev_node(device); |
24a988e9 HH |
94 | if (!u) |
95 | return log_oom(); | |
e23a0ce8 | 96 | |
7410616c LP |
97 | r = unit_name_from_path(u, ".device", &d); |
98 | if (r < 0) | |
99 | return log_error_errno(r, "Failed to generate unit name: %m"); | |
e23a0ce8 | 100 | |
f7f21d33 | 101 | f = fopen(p, "wxe"); |
4a62c710 MS |
102 | if (!f) |
103 | return log_error_errno(errno, "Failed to create unit file %s: %m", p); | |
e23a0ce8 | 104 | |
9ece938a | 105 | fputs( |
6b1dc2bd | 106 | "# Automatically generated by systemd-cryptsetup-generator\n\n" |
e23a0ce8 | 107 | "[Unit]\n" |
9ece938a | 108 | "Description=Cryptography Setup for %I\n" |
c3834f9b | 109 | "Documentation=man:crypttab(5) man:systemd-cryptsetup-generator(8) man:systemd-cryptsetup@.service(8)\n" |
1b64d026 | 110 | "SourcePath=/etc/crypttab\n" |
e23a0ce8 | 111 | "DefaultDependencies=no\n" |
744198e9 | 112 | "Conflicts=umount.target\n" |
9ece938a | 113 | "BindsTo=dev-mapper-%i.device\n" |
4469ff4a | 114 | "IgnoreOnIsolate=true\n" |
d6bc8348 | 115 | "After=cryptsetup-pre.target\n", |
9ece938a | 116 | f); |
e23a0ce8 | 117 | |
155da457 LP |
118 | if (!nofail) |
119 | fprintf(f, | |
120 | "Before=cryptsetup.target\n"); | |
121 | ||
ceca9501 | 122 | if (password) { |
744198e9 | 123 | if (STR_IN_SET(password, "/dev/urandom", "/dev/random", "/dev/hw_random")) |
a0f70805 | 124 | fputs("After=systemd-random-seed.service\n", f); |
66a5dbdf | 125 | else if (!streq(password, "-") && !streq(password, "none")) { |
744198e9 LP |
126 | _cleanup_free_ char *uu; |
127 | ||
128 | uu = fstab_node_to_udev_node(password); | |
129 | if (!uu) | |
66a5dbdf DR |
130 | return log_oom(); |
131 | ||
bde29068 | 132 | if (!path_equal(uu, "/dev/null")) { |
744198e9 | 133 | |
bde29068 | 134 | if (is_device_path(uu)) { |
7410616c | 135 | _cleanup_free_ char *dd = NULL; |
66a5dbdf | 136 | |
7410616c LP |
137 | r = unit_name_from_path(uu, ".device", &dd); |
138 | if (r < 0) | |
139 | return log_error_errno(r, "Failed to generate unit name: %m"); | |
bde29068 LP |
140 | |
141 | fprintf(f, "After=%1$s\nRequires=%1$s\n", dd); | |
142 | } else | |
143 | fprintf(f, "RequiresMountsFor=%s\n", password); | |
144 | } | |
66a5dbdf | 145 | } |
ceca9501 | 146 | } |
e23a0ce8 | 147 | |
9ece938a TW |
148 | if (is_device_path(u)) |
149 | fprintf(f, | |
150 | "BindsTo=%s\n" | |
151 | "After=%s\n" | |
152 | "Before=umount.target\n", | |
153 | d, d); | |
154 | else | |
155 | fprintf(f, | |
156 | "RequiresMountsFor=%s\n", | |
157 | u); | |
158 | ||
8eea8687 ZJS |
159 | r = generator_write_timeouts(arg_dest, device, name, options, &filtered); |
160 | if (r < 0) | |
161 | return r; | |
162 | ||
e23a0ce8 LP |
163 | fprintf(f, |
164 | "\n[Service]\n" | |
165 | "Type=oneshot\n" | |
166 | "RemainAfterExit=yes\n" | |
90724929 | 167 | "TimeoutSec=0\n" /* the binary handles timeouts anyway */ |
260ab287 | 168 | "ExecStart=" SYSTEMD_CRYPTSETUP_PATH " attach '%s' '%s' '%s' '%s'\n" |
7f4e0805 | 169 | "ExecStop=" SYSTEMD_CRYPTSETUP_PATH " detach '%s'\n", |
8eea8687 | 170 | name, u, strempty(password), strempty(filtered), |
e23a0ce8 LP |
171 | name); |
172 | ||
8c11d3c1 | 173 | if (tmp) |
e23a0ce8 | 174 | fprintf(f, |
50109038 | 175 | "ExecStartPost=/sbin/mke2fs '/dev/mapper/%s'\n", |
1d3399e6 | 176 | name); |
e23a0ce8 | 177 | |
8c11d3c1 | 178 | if (swap) |
e23a0ce8 | 179 | fprintf(f, |
50109038 | 180 | "ExecStartPost=/sbin/mkswap '/dev/mapper/%s'\n", |
1d3399e6 | 181 | name); |
e23a0ce8 | 182 | |
4652c56c ZJS |
183 | r = fflush_and_check(f); |
184 | if (r < 0) | |
185 | return log_error_errno(r, "Failed to write file %s: %m", p); | |
e23a0ce8 | 186 | |
63c372cb | 187 | from = strjoina("../", n); |
74715b82 | 188 | |
155da457 | 189 | if (!noauto) { |
e23a0ce8 | 190 | |
b7def684 | 191 | to = strjoin(arg_dest, "/", d, ".wants/", n, NULL); |
24a988e9 HH |
192 | if (!to) |
193 | return log_oom(); | |
e23a0ce8 | 194 | |
d2e54fae | 195 | mkdir_parents_label(to, 0755); |
4a62c710 MS |
196 | if (symlink(from, to) < 0) |
197 | return log_error_errno(errno, "Failed to create symlink %s: %m", to); | |
2f8cd170 LP |
198 | |
199 | free(to); | |
155da457 | 200 | if (!nofail) |
b7def684 | 201 | to = strjoin(arg_dest, "/cryptsetup.target.requires/", n, NULL); |
155da457 | 202 | else |
b7def684 | 203 | to = strjoin(arg_dest, "/cryptsetup.target.wants/", n, NULL); |
24a988e9 HH |
204 | if (!to) |
205 | return log_oom(); | |
2f8cd170 | 206 | |
d2e54fae | 207 | mkdir_parents_label(to, 0755); |
4a62c710 MS |
208 | if (symlink(from, to) < 0) |
209 | return log_error_errno(errno, "Failed to create symlink %s: %m", to); | |
f7f21d33 | 210 | } |
74715b82 | 211 | |
608d41f3 | 212 | free(to); |
b7def684 | 213 | to = strjoin(arg_dest, "/dev-mapper-", e, ".device.requires/", n, NULL); |
24a988e9 HH |
214 | if (!to) |
215 | return log_oom(); | |
74715b82 | 216 | |
d2e54fae | 217 | mkdir_parents_label(to, 0755); |
4a62c710 MS |
218 | if (symlink(from, to) < 0) |
219 | return log_error_errno(errno, "Failed to create symlink %s: %m", to); | |
74715b82 | 220 | |
68395007 | 221 | if (!noauto && !nofail) { |
a6fb0dc1 HG |
222 | _cleanup_free_ char *dmname; |
223 | dmname = strjoin("dev-mapper-", e, ".device", NULL); | |
224 | if (!dmname) | |
225 | return log_oom(); | |
226 | ||
227 | r = write_drop_in(arg_dest, dmname, 90, "device-timeout", | |
8eea8687 ZJS |
228 | "# Automatically generated by systemd-cryptsetup-generator \n\n" |
229 | "[Unit]\nJobTimeoutSec=0"); | |
23bbb0de MS |
230 | if (r < 0) |
231 | return log_error_errno(r, "Failed to write device drop-in: %m"); | |
68395007 HH |
232 | } |
233 | ||
24a988e9 | 234 | return 0; |
e23a0ce8 LP |
235 | } |
236 | ||
0fa9e53d JJ |
237 | static void free_arg_disks(void) { |
238 | crypto_device *d; | |
239 | ||
240 | while ((d = hashmap_steal_first(arg_disks))) { | |
241 | free(d->uuid); | |
6cd5b12a | 242 | free(d->keyfile); |
baade8cc | 243 | free(d->name); |
0fa9e53d JJ |
244 | free(d->options); |
245 | free(d); | |
246 | } | |
247 | ||
248 | hashmap_free(arg_disks); | |
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; | |
baade8cc | 264 | d->keyfile = d->options = d->name = NULL; |
0fa9e53d JJ |
265 | |
266 | d->uuid = strdup(uuid); | |
6b430fdb ZJS |
267 | if (!d->uuid) |
268 | return mfree(d); | |
0fa9e53d JJ |
269 | |
270 | r = hashmap_put(arg_disks, d->uuid, d); | |
271 | if (r < 0) { | |
272 | free(d->uuid); | |
6b430fdb | 273 | return mfree(d); |
0fa9e53d JJ |
274 | } |
275 | } | |
276 | ||
277 | return d; | |
278 | } | |
279 | ||
96287a49 | 280 | static int parse_proc_cmdline_item(const char *key, const char *value, void *data) { |
74df0fca | 281 | int r; |
0fa9e53d JJ |
282 | crypto_device *d; |
283 | _cleanup_free_ char *uuid = NULL, *uuid_value = NULL; | |
66a78c2b | 284 | |
d7f69e16 | 285 | if (streq(key, "luks") && value) { |
059cb385 LP |
286 | |
287 | r = parse_boolean(value); | |
141a79f4 | 288 | if (r < 0) |
059cb385 | 289 | log_warning("Failed to parse luks switch %s. Ignoring.", value); |
141a79f4 ZJS |
290 | else |
291 | arg_enabled = r; | |
66a78c2b | 292 | |
d7f69e16 | 293 | } else if (streq(key, "luks.crypttab") && value) { |
66a78c2b | 294 | |
059cb385 | 295 | r = parse_boolean(value); |
141a79f4 | 296 | if (r < 0) |
059cb385 | 297 | log_warning("Failed to parse luks crypttab switch %s. Ignoring.", value); |
141a79f4 ZJS |
298 | else |
299 | arg_read_crypttab = r; | |
66a78c2b | 300 | |
d7f69e16 | 301 | } else if (streq(key, "luks.uuid") && value) { |
66a78c2b | 302 | |
0fa9e53d JJ |
303 | d = get_crypto_device(startswith(value, "luks-") ? value+5 : value); |
304 | if (!d) | |
141a79f4 | 305 | return log_oom(); |
66a78c2b | 306 | |
0fa9e53d JJ |
307 | d->create = arg_whitelist = true; |
308 | ||
d7f69e16 | 309 | } else if (streq(key, "luks.options") && value) { |
66a78c2b | 310 | |
0fa9e53d JJ |
311 | r = sscanf(value, "%m[0-9a-fA-F-]=%ms", &uuid, &uuid_value); |
312 | if (r == 2) { | |
313 | d = get_crypto_device(uuid); | |
314 | if (!d) | |
315 | return log_oom(); | |
316 | ||
317 | free(d->options); | |
318 | d->options = uuid_value; | |
319 | uuid_value = NULL; | |
320 | } else if (free_and_strdup(&arg_default_options, value) < 0) | |
141a79f4 | 321 | return log_oom(); |
66a78c2b | 322 | |
d7f69e16 | 323 | } else if (streq(key, "luks.key") && value) { |
66a78c2b | 324 | |
6cd5b12a JJ |
325 | r = sscanf(value, "%m[0-9a-fA-F-]=%ms", &uuid, &uuid_value); |
326 | if (r == 2) { | |
327 | d = get_crypto_device(uuid); | |
328 | if (!d) | |
329 | return log_oom(); | |
330 | ||
331 | free(d->keyfile); | |
332 | d->keyfile = uuid_value; | |
333 | uuid_value = NULL; | |
c802a730 | 334 | } else if (free_and_strdup(&arg_default_keyfile, value) < 0) |
141a79f4 | 335 | return log_oom(); |
7ab064a6 | 336 | |
d7f69e16 | 337 | } else if (streq(key, "luks.name") && value) { |
baade8cc JJ |
338 | |
339 | r = sscanf(value, "%m[0-9a-fA-F-]=%ms", &uuid, &uuid_value); | |
340 | if (r == 2) { | |
341 | d = get_crypto_device(uuid); | |
342 | if (!d) | |
343 | return log_oom(); | |
344 | ||
345 | d->create = arg_whitelist = true; | |
346 | ||
347 | free(d->name); | |
348 | d->name = uuid_value; | |
349 | uuid_value = NULL; | |
350 | } else | |
351 | log_warning("Failed to parse luks name switch %s. Ignoring.", value); | |
352 | ||
85013844 | 353 | } |
66a78c2b | 354 | |
24a988e9 | 355 | return 0; |
66a78c2b LP |
356 | } |
357 | ||
0fa9e53d JJ |
358 | static int add_crypttab_devices(void) { |
359 | struct stat st; | |
360 | unsigned crypttab_line = 0; | |
7fd1b19b | 361 | _cleanup_fclose_ FILE *f = NULL; |
e23a0ce8 | 362 | |
0fa9e53d JJ |
363 | if (!arg_read_crypttab) |
364 | return 0; | |
365 | ||
366 | f = fopen("/etc/crypttab", "re"); | |
367 | if (!f) { | |
368 | if (errno != ENOENT) | |
369 | log_error_errno(errno, "Failed to open /etc/crypttab: %m"); | |
370 | return 0; | |
e23a0ce8 LP |
371 | } |
372 | ||
0fa9e53d JJ |
373 | if (fstat(fileno(f), &st) < 0) { |
374 | log_error_errno(errno, "Failed to stat /etc/crypttab: %m"); | |
375 | return 0; | |
376 | } | |
e23a0ce8 | 377 | |
0fa9e53d JJ |
378 | for (;;) { |
379 | int r, k; | |
380 | char line[LINE_MAX], *l, *uuid; | |
381 | crypto_device *d = NULL; | |
382 | _cleanup_free_ char *name = NULL, *device = NULL, *keyfile = NULL, *options = NULL; | |
4c12626c | 383 | |
0fa9e53d JJ |
384 | if (!fgets(line, sizeof(line), f)) |
385 | break; | |
66a78c2b | 386 | |
0fa9e53d | 387 | crypttab_line++; |
141a79f4 | 388 | |
0fa9e53d JJ |
389 | l = strstrip(line); |
390 | if (*l == '#' || *l == 0) | |
391 | continue; | |
66a78c2b | 392 | |
0fa9e53d JJ |
393 | k = sscanf(l, "%ms %ms %ms %ms", &name, &device, &keyfile, &options); |
394 | if (k < 2 || k > 4) { | |
395 | log_error("Failed to parse /etc/crypttab:%u, ignoring.", crypttab_line); | |
396 | continue; | |
397 | } | |
66a78c2b | 398 | |
0fa9e53d JJ |
399 | uuid = startswith(device, "UUID="); |
400 | if (!uuid) | |
401 | uuid = path_startswith(device, "/dev/disk/by-uuid/"); | |
402 | if (!uuid) | |
403 | uuid = startswith(name, "luks-"); | |
404 | if (uuid) | |
405 | d = hashmap_get(arg_disks, uuid); | |
8973790e | 406 | |
0fa9e53d JJ |
407 | if (arg_whitelist && !d) { |
408 | log_info("Not creating device '%s' because it was not specified on the kernel command line.", name); | |
409 | continue; | |
8973790e LP |
410 | } |
411 | ||
0fa9e53d JJ |
412 | r = create_disk(name, device, keyfile, (d && d->options) ? d->options : options); |
413 | if (r < 0) | |
414 | return r; | |
8973790e | 415 | |
0fa9e53d JJ |
416 | if (d) |
417 | d->create = false; | |
418 | } | |
8973790e | 419 | |
0fa9e53d JJ |
420 | return 0; |
421 | } | |
66a78c2b | 422 | |
0fa9e53d JJ |
423 | static int add_proc_cmdline_devices(void) { |
424 | int r; | |
425 | Iterator i; | |
426 | crypto_device *d; | |
66a78c2b | 427 | |
0fa9e53d JJ |
428 | HASHMAP_FOREACH(d, arg_disks, i) { |
429 | const char *options; | |
baade8cc | 430 | _cleanup_free_ char *device = NULL; |
66a78c2b | 431 | |
0fa9e53d JJ |
432 | if (!d->create) |
433 | continue; | |
e23a0ce8 | 434 | |
baade8cc JJ |
435 | if (!d->name) { |
436 | d->name = strappend("luks-", d->uuid); | |
437 | if (!d->name) | |
438 | return log_oom(); | |
439 | } | |
e23a0ce8 | 440 | |
0fa9e53d JJ |
441 | device = strappend("UUID=", d->uuid); |
442 | if (!device) | |
443 | return log_oom(); | |
7ab064a6 | 444 | |
0fa9e53d JJ |
445 | if (d->options) |
446 | options = d->options; | |
447 | else if (arg_default_options) | |
448 | options = arg_default_options; | |
449 | else | |
450 | options = "timeout=0"; | |
141a79f4 | 451 | |
baade8cc | 452 | r = create_disk(d->name, device, d->keyfile ?: arg_default_keyfile, options); |
0fa9e53d JJ |
453 | if (r < 0) |
454 | return r; | |
e23a0ce8 LP |
455 | } |
456 | ||
0fa9e53d JJ |
457 | return 0; |
458 | } | |
e23a0ce8 | 459 | |
0fa9e53d JJ |
460 | int main(int argc, char *argv[]) { |
461 | int r = EXIT_FAILURE; | |
e23a0ce8 | 462 | |
0fa9e53d JJ |
463 | if (argc > 1 && argc != 4) { |
464 | log_error("This program takes three or no arguments."); | |
465 | return EXIT_FAILURE; | |
466 | } | |
e23a0ce8 | 467 | |
0fa9e53d JJ |
468 | if (argc > 1) |
469 | arg_dest = argv[1]; | |
e23a0ce8 | 470 | |
0fa9e53d JJ |
471 | log_set_target(LOG_TARGET_SAFE); |
472 | log_parse_environment(); | |
473 | log_open(); | |
e2cb60fa | 474 | |
0fa9e53d | 475 | umask(0022); |
e23a0ce8 | 476 | |
0fa9e53d JJ |
477 | arg_disks = hashmap_new(&string_hash_ops); |
478 | if (!arg_disks) | |
479 | goto cleanup; | |
7ab064a6 | 480 | |
d7f69e16 | 481 | r = parse_proc_cmdline(parse_proc_cmdline_item, NULL, true); |
0fa9e53d JJ |
482 | if (r < 0) { |
483 | log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m"); | |
484 | r = EXIT_FAILURE; | |
485 | } | |
7ab064a6 | 486 | |
0fa9e53d JJ |
487 | if (!arg_enabled) { |
488 | r = EXIT_SUCCESS; | |
489 | goto cleanup; | |
e23a0ce8 LP |
490 | } |
491 | ||
0fa9e53d JJ |
492 | if (add_crypttab_devices() < 0) |
493 | goto cleanup; | |
494 | ||
495 | if (add_proc_cmdline_devices() < 0) | |
496 | goto cleanup; | |
497 | ||
498 | r = EXIT_SUCCESS; | |
141a79f4 ZJS |
499 | |
500 | cleanup: | |
0fa9e53d JJ |
501 | free_arg_disks(); |
502 | free(arg_default_options); | |
503 | free(arg_default_keyfile); | |
141a79f4 | 504 | |
0fa9e53d | 505 | return r; |
e23a0ce8 | 506 | } |