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e23a0ce8 LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
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 | |
e23a0ce8 LP |
11 | (at your option) any later version. |
12 | ||
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 | |
5430f7f2 | 16 | Lesser General Public License for more details. |
e23a0ce8 | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
e23a0ce8 LP |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
e23a0ce8 | 22 | #include <errno.h> |
e23a0ce8 | 23 | |
0fa9e53d | 24 | #include "dropin.h" |
0fa9e53d JJ |
25 | #include "generator.h" |
26 | #include "hashmap.h" | |
e23a0ce8 | 27 | #include "log.h" |
49e942b2 | 28 | #include "mkdir.h" |
bde29068 | 29 | #include "path-util.h" |
a6dba978 | 30 | #include "fstab-util.h" |
0fa9e53d JJ |
31 | #include "strv.h" |
32 | #include "unit-name.h" | |
33 | #include "util.h" | |
34 | ||
35 | typedef struct crypto_device { | |
36 | char *uuid; | |
6cd5b12a | 37 | char *keyfile; |
baade8cc | 38 | char *name; |
0fa9e53d JJ |
39 | char *options; |
40 | bool create; | |
41 | } crypto_device; | |
e23a0ce8 | 42 | |
66a78c2b LP |
43 | static const char *arg_dest = "/tmp"; |
44 | static bool arg_enabled = true; | |
45 | static bool arg_read_crypttab = true; | |
0fa9e53d JJ |
46 | static bool arg_whitelist = false; |
47 | static Hashmap *arg_disks = NULL; | |
48 | static char *arg_default_options = NULL; | |
49 | static char *arg_default_keyfile = NULL; | |
141a79f4 | 50 | |
e23a0ce8 LP |
51 | static int create_disk( |
52 | const char *name, | |
53 | const char *device, | |
54 | const char *password, | |
55 | const char *options) { | |
56 | ||
8eea8687 ZJS |
57 | _cleanup_free_ char *p = NULL, *n = NULL, *d = NULL, *u = NULL, *to = NULL, *e = NULL, |
58 | *filtered = NULL; | |
7fd1b19b | 59 | _cleanup_fclose_ FILE *f = NULL; |
8c11d3c1 | 60 | bool noauto, nofail, tmp, swap; |
744198e9 LP |
61 | char *from; |
62 | int r; | |
e23a0ce8 LP |
63 | |
64 | assert(name); | |
65 | assert(device); | |
66 | ||
b9f111b9 ZJS |
67 | noauto = fstab_test_yes_no_option(options, "noauto\0" "auto\0"); |
68 | nofail = fstab_test_yes_no_option(options, "nofail\0" "fail\0"); | |
a6dba978 ZJS |
69 | tmp = fstab_test_option(options, "tmp\0"); |
70 | swap = fstab_test_option(options, "swap\0"); | |
8c11d3c1 TG |
71 | |
72 | if (tmp && swap) { | |
73 | log_error("Device '%s' cannot be both 'tmp' and 'swap'. Ignoring.", name); | |
74 | return -EINVAL; | |
75 | } | |
155da457 | 76 | |
744198e9 LP |
77 | e = unit_name_escape(name); |
78 | if (!e) | |
79 | return log_oom(); | |
80 | ||
7410616c LP |
81 | r = unit_name_build("systemd-cryptsetup", e, ".service", &n); |
82 | if (r < 0) | |
83 | return log_error_errno(r, "Failed to generate unit name: %m"); | |
e23a0ce8 | 84 | |
b7def684 | 85 | p = strjoin(arg_dest, "/", n, NULL); |
24a988e9 HH |
86 | if (!p) |
87 | return log_oom(); | |
e23a0ce8 | 88 | |
f7f21d33 | 89 | u = fstab_node_to_udev_node(device); |
24a988e9 HH |
90 | if (!u) |
91 | return log_oom(); | |
e23a0ce8 | 92 | |
7410616c LP |
93 | r = unit_name_from_path(u, ".device", &d); |
94 | if (r < 0) | |
95 | return log_error_errno(r, "Failed to generate unit name: %m"); | |
e23a0ce8 | 96 | |
f7f21d33 | 97 | f = fopen(p, "wxe"); |
4a62c710 MS |
98 | if (!f) |
99 | return log_error_errno(errno, "Failed to create unit file %s: %m", p); | |
e23a0ce8 | 100 | |
9ece938a | 101 | fputs( |
6b1dc2bd | 102 | "# Automatically generated by systemd-cryptsetup-generator\n\n" |
e23a0ce8 | 103 | "[Unit]\n" |
9ece938a | 104 | "Description=Cryptography Setup for %I\n" |
c3834f9b | 105 | "Documentation=man:crypttab(5) man:systemd-cryptsetup-generator(8) man:systemd-cryptsetup@.service(8)\n" |
1b64d026 | 106 | "SourcePath=/etc/crypttab\n" |
e23a0ce8 | 107 | "DefaultDependencies=no\n" |
744198e9 | 108 | "Conflicts=umount.target\n" |
9ece938a | 109 | "BindsTo=dev-mapper-%i.device\n" |
4469ff4a | 110 | "IgnoreOnIsolate=true\n" |
d6bc8348 | 111 | "After=cryptsetup-pre.target\n", |
9ece938a | 112 | f); |
e23a0ce8 | 113 | |
155da457 LP |
114 | if (!nofail) |
115 | fprintf(f, | |
116 | "Before=cryptsetup.target\n"); | |
117 | ||
ceca9501 | 118 | if (password) { |
744198e9 | 119 | if (STR_IN_SET(password, "/dev/urandom", "/dev/random", "/dev/hw_random")) |
a0f70805 | 120 | fputs("After=systemd-random-seed.service\n", f); |
66a5dbdf | 121 | else if (!streq(password, "-") && !streq(password, "none")) { |
744198e9 LP |
122 | _cleanup_free_ char *uu; |
123 | ||
124 | uu = fstab_node_to_udev_node(password); | |
125 | if (!uu) | |
66a5dbdf DR |
126 | return log_oom(); |
127 | ||
bde29068 | 128 | if (!path_equal(uu, "/dev/null")) { |
744198e9 | 129 | |
bde29068 | 130 | if (is_device_path(uu)) { |
7410616c | 131 | _cleanup_free_ char *dd = NULL; |
66a5dbdf | 132 | |
7410616c LP |
133 | r = unit_name_from_path(uu, ".device", &dd); |
134 | if (r < 0) | |
135 | return log_error_errno(r, "Failed to generate unit name: %m"); | |
bde29068 LP |
136 | |
137 | fprintf(f, "After=%1$s\nRequires=%1$s\n", dd); | |
138 | } else | |
139 | fprintf(f, "RequiresMountsFor=%s\n", password); | |
140 | } | |
66a5dbdf | 141 | } |
ceca9501 | 142 | } |
e23a0ce8 | 143 | |
9ece938a TW |
144 | if (is_device_path(u)) |
145 | fprintf(f, | |
146 | "BindsTo=%s\n" | |
147 | "After=%s\n" | |
148 | "Before=umount.target\n", | |
149 | d, d); | |
150 | else | |
151 | fprintf(f, | |
152 | "RequiresMountsFor=%s\n", | |
153 | u); | |
154 | ||
8eea8687 ZJS |
155 | r = generator_write_timeouts(arg_dest, device, name, options, &filtered); |
156 | if (r < 0) | |
157 | return r; | |
158 | ||
e23a0ce8 LP |
159 | fprintf(f, |
160 | "\n[Service]\n" | |
161 | "Type=oneshot\n" | |
162 | "RemainAfterExit=yes\n" | |
90724929 | 163 | "TimeoutSec=0\n" /* the binary handles timeouts anyway */ |
260ab287 | 164 | "ExecStart=" SYSTEMD_CRYPTSETUP_PATH " attach '%s' '%s' '%s' '%s'\n" |
7f4e0805 | 165 | "ExecStop=" SYSTEMD_CRYPTSETUP_PATH " detach '%s'\n", |
8eea8687 | 166 | name, u, strempty(password), strempty(filtered), |
e23a0ce8 LP |
167 | name); |
168 | ||
8c11d3c1 | 169 | if (tmp) |
e23a0ce8 | 170 | fprintf(f, |
50109038 | 171 | "ExecStartPost=/sbin/mke2fs '/dev/mapper/%s'\n", |
1d3399e6 | 172 | name); |
e23a0ce8 | 173 | |
8c11d3c1 | 174 | if (swap) |
e23a0ce8 | 175 | fprintf(f, |
50109038 | 176 | "ExecStartPost=/sbin/mkswap '/dev/mapper/%s'\n", |
1d3399e6 | 177 | name); |
e23a0ce8 LP |
178 | |
179 | fflush(f); | |
4a62c710 MS |
180 | if (ferror(f)) |
181 | return log_error_errno(errno, "Failed to write file %s: %m", p); | |
e23a0ce8 | 182 | |
63c372cb | 183 | from = strjoina("../", n); |
74715b82 | 184 | |
155da457 | 185 | if (!noauto) { |
e23a0ce8 | 186 | |
b7def684 | 187 | to = strjoin(arg_dest, "/", d, ".wants/", n, NULL); |
24a988e9 HH |
188 | if (!to) |
189 | return log_oom(); | |
e23a0ce8 | 190 | |
d2e54fae | 191 | mkdir_parents_label(to, 0755); |
4a62c710 MS |
192 | if (symlink(from, to) < 0) |
193 | return log_error_errno(errno, "Failed to create symlink %s: %m", to); | |
2f8cd170 LP |
194 | |
195 | free(to); | |
155da457 | 196 | if (!nofail) |
b7def684 | 197 | to = strjoin(arg_dest, "/cryptsetup.target.requires/", n, NULL); |
155da457 | 198 | else |
b7def684 | 199 | to = strjoin(arg_dest, "/cryptsetup.target.wants/", n, NULL); |
24a988e9 HH |
200 | if (!to) |
201 | return log_oom(); | |
2f8cd170 | 202 | |
d2e54fae | 203 | mkdir_parents_label(to, 0755); |
4a62c710 MS |
204 | if (symlink(from, to) < 0) |
205 | return log_error_errno(errno, "Failed to create symlink %s: %m", to); | |
f7f21d33 | 206 | } |
74715b82 | 207 | |
608d41f3 | 208 | free(to); |
b7def684 | 209 | to = strjoin(arg_dest, "/dev-mapper-", e, ".device.requires/", n, NULL); |
24a988e9 HH |
210 | if (!to) |
211 | return log_oom(); | |
74715b82 | 212 | |
d2e54fae | 213 | mkdir_parents_label(to, 0755); |
4a62c710 MS |
214 | if (symlink(from, to) < 0) |
215 | return log_error_errno(errno, "Failed to create symlink %s: %m", to); | |
74715b82 | 216 | |
68395007 | 217 | if (!noauto && !nofail) { |
a6fb0dc1 HG |
218 | _cleanup_free_ char *dmname; |
219 | dmname = strjoin("dev-mapper-", e, ".device", NULL); | |
220 | if (!dmname) | |
221 | return log_oom(); | |
222 | ||
223 | r = write_drop_in(arg_dest, dmname, 90, "device-timeout", | |
8eea8687 ZJS |
224 | "# Automatically generated by systemd-cryptsetup-generator \n\n" |
225 | "[Unit]\nJobTimeoutSec=0"); | |
23bbb0de MS |
226 | if (r < 0) |
227 | return log_error_errno(r, "Failed to write device drop-in: %m"); | |
68395007 HH |
228 | } |
229 | ||
24a988e9 | 230 | return 0; |
e23a0ce8 LP |
231 | } |
232 | ||
0fa9e53d JJ |
233 | static void free_arg_disks(void) { |
234 | crypto_device *d; | |
235 | ||
236 | while ((d = hashmap_steal_first(arg_disks))) { | |
237 | free(d->uuid); | |
6cd5b12a | 238 | free(d->keyfile); |
baade8cc | 239 | free(d->name); |
0fa9e53d JJ |
240 | free(d->options); |
241 | free(d); | |
242 | } | |
243 | ||
244 | hashmap_free(arg_disks); | |
245 | } | |
246 | ||
247 | static crypto_device *get_crypto_device(const char *uuid) { | |
248 | int r; | |
249 | crypto_device *d; | |
250 | ||
251 | assert(uuid); | |
252 | ||
253 | d = hashmap_get(arg_disks, uuid); | |
254 | if (!d) { | |
255 | d = new0(struct crypto_device, 1); | |
256 | if (!d) | |
257 | return NULL; | |
258 | ||
259 | d->create = false; | |
baade8cc | 260 | d->keyfile = d->options = d->name = NULL; |
0fa9e53d JJ |
261 | |
262 | d->uuid = strdup(uuid); | |
263 | if (!d->uuid) { | |
264 | free(d); | |
265 | return NULL; | |
266 | } | |
267 | ||
268 | r = hashmap_put(arg_disks, d->uuid, d); | |
269 | if (r < 0) { | |
270 | free(d->uuid); | |
271 | free(d); | |
272 | return NULL; | |
273 | } | |
274 | } | |
275 | ||
276 | return d; | |
277 | } | |
278 | ||
059cb385 | 279 | static int parse_proc_cmdline_item(const char *key, const char *value) { |
74df0fca | 280 | int r; |
0fa9e53d JJ |
281 | crypto_device *d; |
282 | _cleanup_free_ char *uuid = NULL, *uuid_value = NULL; | |
66a78c2b | 283 | |
059cb385 LP |
284 | if (STR_IN_SET(key, "luks", "rd.luks") && value) { |
285 | ||
286 | r = parse_boolean(value); | |
141a79f4 | 287 | if (r < 0) |
059cb385 | 288 | log_warning("Failed to parse luks switch %s. Ignoring.", value); |
141a79f4 ZJS |
289 | else |
290 | arg_enabled = r; | |
66a78c2b | 291 | |
059cb385 | 292 | } else if (STR_IN_SET(key, "luks.crypttab", "rd.luks.crypttab") && value) { |
66a78c2b | 293 | |
059cb385 | 294 | r = parse_boolean(value); |
141a79f4 | 295 | if (r < 0) |
059cb385 | 296 | log_warning("Failed to parse luks crypttab switch %s. Ignoring.", value); |
141a79f4 ZJS |
297 | else |
298 | arg_read_crypttab = r; | |
66a78c2b | 299 | |
059cb385 | 300 | } else if (STR_IN_SET(key, "luks.uuid", "rd.luks.uuid") && value) { |
66a78c2b | 301 | |
0fa9e53d JJ |
302 | d = get_crypto_device(startswith(value, "luks-") ? value+5 : value); |
303 | if (!d) | |
141a79f4 | 304 | return log_oom(); |
66a78c2b | 305 | |
0fa9e53d JJ |
306 | d->create = arg_whitelist = true; |
307 | ||
059cb385 | 308 | } else if (STR_IN_SET(key, "luks.options", "rd.luks.options") && value) { |
66a78c2b | 309 | |
0fa9e53d JJ |
310 | r = sscanf(value, "%m[0-9a-fA-F-]=%ms", &uuid, &uuid_value); |
311 | if (r == 2) { | |
312 | d = get_crypto_device(uuid); | |
313 | if (!d) | |
314 | return log_oom(); | |
315 | ||
316 | free(d->options); | |
317 | d->options = uuid_value; | |
318 | uuid_value = NULL; | |
319 | } else if (free_and_strdup(&arg_default_options, value) < 0) | |
141a79f4 | 320 | return log_oom(); |
66a78c2b | 321 | |
059cb385 | 322 | } else if (STR_IN_SET(key, "luks.key", "rd.luks.key") && value) { |
66a78c2b | 323 | |
6cd5b12a JJ |
324 | r = sscanf(value, "%m[0-9a-fA-F-]=%ms", &uuid, &uuid_value); |
325 | if (r == 2) { | |
326 | d = get_crypto_device(uuid); | |
327 | if (!d) | |
328 | return log_oom(); | |
329 | ||
330 | free(d->keyfile); | |
331 | d->keyfile = uuid_value; | |
332 | uuid_value = NULL; | |
333 | } else if (free_and_strdup(&arg_default_keyfile, value)) | |
141a79f4 | 334 | return log_oom(); |
7ab064a6 | 335 | |
baade8cc JJ |
336 | } else if (STR_IN_SET(key, "luks.name", "rd.luks.name") && value) { |
337 | ||
338 | r = sscanf(value, "%m[0-9a-fA-F-]=%ms", &uuid, &uuid_value); | |
339 | if (r == 2) { | |
340 | d = get_crypto_device(uuid); | |
341 | if (!d) | |
342 | return log_oom(); | |
343 | ||
344 | d->create = arg_whitelist = true; | |
345 | ||
346 | free(d->name); | |
347 | d->name = uuid_value; | |
348 | uuid_value = NULL; | |
349 | } else | |
350 | log_warning("Failed to parse luks name switch %s. Ignoring.", value); | |
351 | ||
85013844 | 352 | } |
66a78c2b | 353 | |
24a988e9 | 354 | return 0; |
66a78c2b LP |
355 | } |
356 | ||
0fa9e53d JJ |
357 | static int add_crypttab_devices(void) { |
358 | struct stat st; | |
359 | unsigned crypttab_line = 0; | |
7fd1b19b | 360 | _cleanup_fclose_ FILE *f = NULL; |
e23a0ce8 | 361 | |
0fa9e53d JJ |
362 | if (!arg_read_crypttab) |
363 | return 0; | |
364 | ||
365 | f = fopen("/etc/crypttab", "re"); | |
366 | if (!f) { | |
367 | if (errno != ENOENT) | |
368 | log_error_errno(errno, "Failed to open /etc/crypttab: %m"); | |
369 | return 0; | |
e23a0ce8 LP |
370 | } |
371 | ||
0fa9e53d JJ |
372 | if (fstat(fileno(f), &st) < 0) { |
373 | log_error_errno(errno, "Failed to stat /etc/crypttab: %m"); | |
374 | return 0; | |
375 | } | |
e23a0ce8 | 376 | |
0fa9e53d JJ |
377 | for (;;) { |
378 | int r, k; | |
379 | char line[LINE_MAX], *l, *uuid; | |
380 | crypto_device *d = NULL; | |
381 | _cleanup_free_ char *name = NULL, *device = NULL, *keyfile = NULL, *options = NULL; | |
4c12626c | 382 | |
0fa9e53d JJ |
383 | if (!fgets(line, sizeof(line), f)) |
384 | break; | |
66a78c2b | 385 | |
0fa9e53d | 386 | crypttab_line++; |
141a79f4 | 387 | |
0fa9e53d JJ |
388 | l = strstrip(line); |
389 | if (*l == '#' || *l == 0) | |
390 | continue; | |
66a78c2b | 391 | |
0fa9e53d JJ |
392 | k = sscanf(l, "%ms %ms %ms %ms", &name, &device, &keyfile, &options); |
393 | if (k < 2 || k > 4) { | |
394 | log_error("Failed to parse /etc/crypttab:%u, ignoring.", crypttab_line); | |
395 | continue; | |
396 | } | |
66a78c2b | 397 | |
0fa9e53d JJ |
398 | uuid = startswith(device, "UUID="); |
399 | if (!uuid) | |
400 | uuid = path_startswith(device, "/dev/disk/by-uuid/"); | |
401 | if (!uuid) | |
402 | uuid = startswith(name, "luks-"); | |
403 | if (uuid) | |
404 | d = hashmap_get(arg_disks, uuid); | |
8973790e | 405 | |
0fa9e53d JJ |
406 | if (arg_whitelist && !d) { |
407 | log_info("Not creating device '%s' because it was not specified on the kernel command line.", name); | |
408 | continue; | |
8973790e LP |
409 | } |
410 | ||
0fa9e53d JJ |
411 | r = create_disk(name, device, keyfile, (d && d->options) ? d->options : options); |
412 | if (r < 0) | |
413 | return r; | |
8973790e | 414 | |
0fa9e53d JJ |
415 | if (d) |
416 | d->create = false; | |
417 | } | |
8973790e | 418 | |
0fa9e53d JJ |
419 | return 0; |
420 | } | |
66a78c2b | 421 | |
0fa9e53d JJ |
422 | static int add_proc_cmdline_devices(void) { |
423 | int r; | |
424 | Iterator i; | |
425 | crypto_device *d; | |
66a78c2b | 426 | |
0fa9e53d JJ |
427 | HASHMAP_FOREACH(d, arg_disks, i) { |
428 | const char *options; | |
baade8cc | 429 | _cleanup_free_ char *device = NULL; |
66a78c2b | 430 | |
0fa9e53d JJ |
431 | if (!d->create) |
432 | continue; | |
e23a0ce8 | 433 | |
baade8cc JJ |
434 | if (!d->name) { |
435 | d->name = strappend("luks-", d->uuid); | |
436 | if (!d->name) | |
437 | return log_oom(); | |
438 | } | |
e23a0ce8 | 439 | |
0fa9e53d JJ |
440 | device = strappend("UUID=", d->uuid); |
441 | if (!device) | |
442 | return log_oom(); | |
7ab064a6 | 443 | |
0fa9e53d JJ |
444 | if (d->options) |
445 | options = d->options; | |
446 | else if (arg_default_options) | |
447 | options = arg_default_options; | |
448 | else | |
449 | options = "timeout=0"; | |
141a79f4 | 450 | |
baade8cc | 451 | r = create_disk(d->name, device, d->keyfile ?: arg_default_keyfile, options); |
0fa9e53d JJ |
452 | if (r < 0) |
453 | return r; | |
e23a0ce8 LP |
454 | } |
455 | ||
0fa9e53d JJ |
456 | return 0; |
457 | } | |
e23a0ce8 | 458 | |
0fa9e53d JJ |
459 | int main(int argc, char *argv[]) { |
460 | int r = EXIT_FAILURE; | |
e23a0ce8 | 461 | |
0fa9e53d JJ |
462 | if (argc > 1 && argc != 4) { |
463 | log_error("This program takes three or no arguments."); | |
464 | return EXIT_FAILURE; | |
465 | } | |
e23a0ce8 | 466 | |
0fa9e53d JJ |
467 | if (argc > 1) |
468 | arg_dest = argv[1]; | |
e23a0ce8 | 469 | |
0fa9e53d JJ |
470 | log_set_target(LOG_TARGET_SAFE); |
471 | log_parse_environment(); | |
472 | log_open(); | |
e2cb60fa | 473 | |
0fa9e53d | 474 | umask(0022); |
e23a0ce8 | 475 | |
0fa9e53d JJ |
476 | arg_disks = hashmap_new(&string_hash_ops); |
477 | if (!arg_disks) | |
478 | goto cleanup; | |
7ab064a6 | 479 | |
0fa9e53d JJ |
480 | r = parse_proc_cmdline(parse_proc_cmdline_item); |
481 | if (r < 0) { | |
482 | log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m"); | |
483 | r = EXIT_FAILURE; | |
484 | } | |
7ab064a6 | 485 | |
0fa9e53d JJ |
486 | if (!arg_enabled) { |
487 | r = EXIT_SUCCESS; | |
488 | goto cleanup; | |
e23a0ce8 LP |
489 | } |
490 | ||
0fa9e53d JJ |
491 | if (add_crypttab_devices() < 0) |
492 | goto cleanup; | |
493 | ||
494 | if (add_proc_cmdline_devices() < 0) | |
495 | goto cleanup; | |
496 | ||
497 | r = EXIT_SUCCESS; | |
141a79f4 ZJS |
498 | |
499 | cleanup: | |
0fa9e53d JJ |
500 | free_arg_disks(); |
501 | free(arg_default_options); | |
502 | free(arg_default_keyfile); | |
141a79f4 | 503 | |
0fa9e53d | 504 | return r; |
e23a0ce8 | 505 | } |