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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> |
0fa9e53d | 23 | #include <string.h> |
e23a0ce8 LP |
24 | #include <unistd.h> |
25 | ||
0fa9e53d JJ |
26 | #include "dropin.h" |
27 | #include "fileio.h" | |
28 | #include "generator.h" | |
29 | #include "hashmap.h" | |
e23a0ce8 | 30 | #include "log.h" |
49e942b2 | 31 | #include "mkdir.h" |
bde29068 | 32 | #include "path-util.h" |
a6dba978 | 33 | #include "fstab-util.h" |
0fa9e53d JJ |
34 | #include "strv.h" |
35 | #include "unit-name.h" | |
36 | #include "util.h" | |
37 | ||
38 | typedef struct crypto_device { | |
39 | char *uuid; | |
6cd5b12a | 40 | char *keyfile; |
baade8cc | 41 | char *name; |
0fa9e53d JJ |
42 | char *options; |
43 | bool create; | |
44 | } crypto_device; | |
e23a0ce8 | 45 | |
66a78c2b LP |
46 | static const char *arg_dest = "/tmp"; |
47 | static bool arg_enabled = true; | |
48 | static bool arg_read_crypttab = true; | |
0fa9e53d JJ |
49 | static bool arg_whitelist = false; |
50 | static Hashmap *arg_disks = NULL; | |
51 | static char *arg_default_options = NULL; | |
52 | static char *arg_default_keyfile = NULL; | |
141a79f4 | 53 | |
e23a0ce8 LP |
54 | static int create_disk( |
55 | const char *name, | |
56 | const char *device, | |
57 | const char *password, | |
58 | const char *options) { | |
59 | ||
8eea8687 ZJS |
60 | _cleanup_free_ char *p = NULL, *n = NULL, *d = NULL, *u = NULL, *to = NULL, *e = NULL, |
61 | *filtered = NULL; | |
7fd1b19b | 62 | _cleanup_fclose_ FILE *f = NULL; |
8c11d3c1 | 63 | bool noauto, nofail, tmp, swap; |
744198e9 LP |
64 | char *from; |
65 | int r; | |
e23a0ce8 LP |
66 | |
67 | assert(name); | |
68 | assert(device); | |
69 | ||
a6dba978 ZJS |
70 | noauto = fstab_test_option(options, "noauto\0"); |
71 | nofail = fstab_test_option(options, "nofail\0"); | |
72 | tmp = fstab_test_option(options, "tmp\0"); | |
73 | swap = fstab_test_option(options, "swap\0"); | |
8c11d3c1 TG |
74 | |
75 | if (tmp && swap) { | |
76 | log_error("Device '%s' cannot be both 'tmp' and 'swap'. Ignoring.", name); | |
77 | return -EINVAL; | |
78 | } | |
155da457 | 79 | |
744198e9 LP |
80 | e = unit_name_escape(name); |
81 | if (!e) | |
82 | return log_oom(); | |
83 | ||
84 | n = unit_name_build("systemd-cryptsetup", e, ".service"); | |
24a988e9 HH |
85 | if (!n) |
86 | return log_oom(); | |
e23a0ce8 | 87 | |
b7def684 | 88 | p = strjoin(arg_dest, "/", n, NULL); |
24a988e9 HH |
89 | if (!p) |
90 | return log_oom(); | |
e23a0ce8 | 91 | |
f7f21d33 | 92 | u = fstab_node_to_udev_node(device); |
24a988e9 HH |
93 | if (!u) |
94 | return log_oom(); | |
e23a0ce8 | 95 | |
f7f21d33 | 96 | d = unit_name_from_path(u, ".device"); |
24a988e9 HH |
97 | if (!d) |
98 | return log_oom(); | |
e23a0ce8 | 99 | |
f7f21d33 | 100 | f = fopen(p, "wxe"); |
4a62c710 MS |
101 | if (!f) |
102 | return log_error_errno(errno, "Failed to create unit file %s: %m", p); | |
e23a0ce8 | 103 | |
9ece938a | 104 | fputs( |
6b1dc2bd | 105 | "# Automatically generated by systemd-cryptsetup-generator\n\n" |
e23a0ce8 | 106 | "[Unit]\n" |
9ece938a | 107 | "Description=Cryptography Setup for %I\n" |
c3834f9b | 108 | "Documentation=man:crypttab(5) man:systemd-cryptsetup-generator(8) man:systemd-cryptsetup@.service(8)\n" |
1b64d026 | 109 | "SourcePath=/etc/crypttab\n" |
e23a0ce8 | 110 | "DefaultDependencies=no\n" |
744198e9 | 111 | "Conflicts=umount.target\n" |
9ece938a | 112 | "BindsTo=dev-mapper-%i.device\n" |
4469ff4a | 113 | "IgnoreOnIsolate=true\n" |
d6bc8348 | 114 | "After=cryptsetup-pre.target\n", |
9ece938a | 115 | f); |
e23a0ce8 | 116 | |
155da457 LP |
117 | if (!nofail) |
118 | fprintf(f, | |
119 | "Before=cryptsetup.target\n"); | |
120 | ||
ceca9501 | 121 | if (password) { |
744198e9 | 122 | if (STR_IN_SET(password, "/dev/urandom", "/dev/random", "/dev/hw_random")) |
a0f70805 | 123 | fputs("After=systemd-random-seed.service\n", f); |
66a5dbdf | 124 | else if (!streq(password, "-") && !streq(password, "none")) { |
744198e9 LP |
125 | _cleanup_free_ char *uu; |
126 | ||
127 | uu = fstab_node_to_udev_node(password); | |
128 | if (!uu) | |
66a5dbdf DR |
129 | return log_oom(); |
130 | ||
bde29068 | 131 | if (!path_equal(uu, "/dev/null")) { |
744198e9 | 132 | |
bde29068 LP |
133 | if (is_device_path(uu)) { |
134 | _cleanup_free_ char *dd; | |
66a5dbdf | 135 | |
bde29068 LP |
136 | dd = unit_name_from_path(uu, ".device"); |
137 | if (!dd) | |
138 | return log_oom(); | |
139 | ||
140 | fprintf(f, "After=%1$s\nRequires=%1$s\n", dd); | |
141 | } else | |
142 | fprintf(f, "RequiresMountsFor=%s\n", password); | |
143 | } | |
66a5dbdf | 144 | } |
ceca9501 | 145 | } |
e23a0ce8 | 146 | |
9ece938a TW |
147 | if (is_device_path(u)) |
148 | fprintf(f, | |
149 | "BindsTo=%s\n" | |
150 | "After=%s\n" | |
151 | "Before=umount.target\n", | |
152 | d, d); | |
153 | else | |
154 | fprintf(f, | |
155 | "RequiresMountsFor=%s\n", | |
156 | u); | |
157 | ||
8eea8687 ZJS |
158 | r = generator_write_timeouts(arg_dest, device, name, options, &filtered); |
159 | if (r < 0) | |
160 | return r; | |
161 | ||
e23a0ce8 LP |
162 | fprintf(f, |
163 | "\n[Service]\n" | |
164 | "Type=oneshot\n" | |
165 | "RemainAfterExit=yes\n" | |
90724929 | 166 | "TimeoutSec=0\n" /* the binary handles timeouts anyway */ |
260ab287 | 167 | "ExecStart=" SYSTEMD_CRYPTSETUP_PATH " attach '%s' '%s' '%s' '%s'\n" |
7f4e0805 | 168 | "ExecStop=" SYSTEMD_CRYPTSETUP_PATH " detach '%s'\n", |
8eea8687 | 169 | name, u, strempty(password), strempty(filtered), |
e23a0ce8 LP |
170 | name); |
171 | ||
8c11d3c1 | 172 | if (tmp) |
e23a0ce8 | 173 | fprintf(f, |
50109038 | 174 | "ExecStartPost=/sbin/mke2fs '/dev/mapper/%s'\n", |
1d3399e6 | 175 | name); |
e23a0ce8 | 176 | |
8c11d3c1 | 177 | if (swap) |
e23a0ce8 | 178 | fprintf(f, |
50109038 | 179 | "ExecStartPost=/sbin/mkswap '/dev/mapper/%s'\n", |
1d3399e6 | 180 | name); |
e23a0ce8 LP |
181 | |
182 | fflush(f); | |
4a62c710 MS |
183 | if (ferror(f)) |
184 | return log_error_errno(errno, "Failed to write file %s: %m", p); | |
e23a0ce8 | 185 | |
744198e9 | 186 | from = strappenda("../", n); |
74715b82 | 187 | |
155da457 | 188 | if (!noauto) { |
e23a0ce8 | 189 | |
b7def684 | 190 | to = strjoin(arg_dest, "/", d, ".wants/", n, NULL); |
24a988e9 HH |
191 | if (!to) |
192 | return log_oom(); | |
e23a0ce8 | 193 | |
d2e54fae | 194 | mkdir_parents_label(to, 0755); |
4a62c710 MS |
195 | if (symlink(from, to) < 0) |
196 | return log_error_errno(errno, "Failed to create symlink %s: %m", to); | |
2f8cd170 LP |
197 | |
198 | free(to); | |
155da457 | 199 | if (!nofail) |
b7def684 | 200 | to = strjoin(arg_dest, "/cryptsetup.target.requires/", n, NULL); |
155da457 | 201 | else |
b7def684 | 202 | to = strjoin(arg_dest, "/cryptsetup.target.wants/", n, NULL); |
24a988e9 HH |
203 | if (!to) |
204 | return log_oom(); | |
2f8cd170 | 205 | |
d2e54fae | 206 | mkdir_parents_label(to, 0755); |
4a62c710 MS |
207 | if (symlink(from, to) < 0) |
208 | return log_error_errno(errno, "Failed to create symlink %s: %m", to); | |
f7f21d33 | 209 | } |
74715b82 | 210 | |
608d41f3 | 211 | free(to); |
b7def684 | 212 | to = strjoin(arg_dest, "/dev-mapper-", e, ".device.requires/", n, NULL); |
24a988e9 HH |
213 | if (!to) |
214 | return log_oom(); | |
74715b82 | 215 | |
d2e54fae | 216 | mkdir_parents_label(to, 0755); |
4a62c710 MS |
217 | if (symlink(from, to) < 0) |
218 | return log_error_errno(errno, "Failed to create symlink %s: %m", to); | |
74715b82 | 219 | |
68395007 | 220 | if (!noauto && !nofail) { |
a6fb0dc1 HG |
221 | _cleanup_free_ char *dmname; |
222 | dmname = strjoin("dev-mapper-", e, ".device", NULL); | |
223 | if (!dmname) | |
224 | return log_oom(); | |
225 | ||
226 | r = write_drop_in(arg_dest, dmname, 90, "device-timeout", | |
8eea8687 ZJS |
227 | "# Automatically generated by systemd-cryptsetup-generator \n\n" |
228 | "[Unit]\nJobTimeoutSec=0"); | |
23bbb0de MS |
229 | if (r < 0) |
230 | return log_error_errno(r, "Failed to write device drop-in: %m"); | |
68395007 HH |
231 | } |
232 | ||
24a988e9 | 233 | return 0; |
e23a0ce8 LP |
234 | } |
235 | ||
0fa9e53d JJ |
236 | static void free_arg_disks(void) { |
237 | crypto_device *d; | |
238 | ||
239 | while ((d = hashmap_steal_first(arg_disks))) { | |
240 | free(d->uuid); | |
6cd5b12a | 241 | free(d->keyfile); |
baade8cc | 242 | free(d->name); |
0fa9e53d JJ |
243 | free(d->options); |
244 | free(d); | |
245 | } | |
246 | ||
247 | hashmap_free(arg_disks); | |
248 | } | |
249 | ||
250 | static crypto_device *get_crypto_device(const char *uuid) { | |
251 | int r; | |
252 | crypto_device *d; | |
253 | ||
254 | assert(uuid); | |
255 | ||
256 | d = hashmap_get(arg_disks, uuid); | |
257 | if (!d) { | |
258 | d = new0(struct crypto_device, 1); | |
259 | if (!d) | |
260 | return NULL; | |
261 | ||
262 | d->create = false; | |
baade8cc | 263 | d->keyfile = d->options = d->name = NULL; |
0fa9e53d JJ |
264 | |
265 | d->uuid = strdup(uuid); | |
266 | if (!d->uuid) { | |
267 | free(d); | |
268 | return NULL; | |
269 | } | |
270 | ||
271 | r = hashmap_put(arg_disks, d->uuid, d); | |
272 | if (r < 0) { | |
273 | free(d->uuid); | |
274 | free(d); | |
275 | return NULL; | |
276 | } | |
277 | } | |
278 | ||
279 | return d; | |
280 | } | |
281 | ||
059cb385 | 282 | static int parse_proc_cmdline_item(const char *key, const char *value) { |
74df0fca | 283 | int r; |
0fa9e53d JJ |
284 | crypto_device *d; |
285 | _cleanup_free_ char *uuid = NULL, *uuid_value = NULL; | |
66a78c2b | 286 | |
059cb385 LP |
287 | if (STR_IN_SET(key, "luks", "rd.luks") && value) { |
288 | ||
289 | r = parse_boolean(value); | |
141a79f4 | 290 | if (r < 0) |
059cb385 | 291 | log_warning("Failed to parse luks switch %s. Ignoring.", value); |
141a79f4 ZJS |
292 | else |
293 | arg_enabled = r; | |
66a78c2b | 294 | |
059cb385 | 295 | } else if (STR_IN_SET(key, "luks.crypttab", "rd.luks.crypttab") && value) { |
66a78c2b | 296 | |
059cb385 | 297 | r = parse_boolean(value); |
141a79f4 | 298 | if (r < 0) |
059cb385 | 299 | log_warning("Failed to parse luks crypttab switch %s. Ignoring.", value); |
141a79f4 ZJS |
300 | else |
301 | arg_read_crypttab = r; | |
66a78c2b | 302 | |
059cb385 | 303 | } else if (STR_IN_SET(key, "luks.uuid", "rd.luks.uuid") && value) { |
66a78c2b | 304 | |
0fa9e53d JJ |
305 | d = get_crypto_device(startswith(value, "luks-") ? value+5 : value); |
306 | if (!d) | |
141a79f4 | 307 | return log_oom(); |
66a78c2b | 308 | |
0fa9e53d JJ |
309 | d->create = arg_whitelist = true; |
310 | ||
059cb385 | 311 | } else if (STR_IN_SET(key, "luks.options", "rd.luks.options") && value) { |
66a78c2b | 312 | |
0fa9e53d JJ |
313 | r = sscanf(value, "%m[0-9a-fA-F-]=%ms", &uuid, &uuid_value); |
314 | if (r == 2) { | |
315 | d = get_crypto_device(uuid); | |
316 | if (!d) | |
317 | return log_oom(); | |
318 | ||
319 | free(d->options); | |
320 | d->options = uuid_value; | |
321 | uuid_value = NULL; | |
322 | } else if (free_and_strdup(&arg_default_options, value) < 0) | |
141a79f4 | 323 | return log_oom(); |
66a78c2b | 324 | |
059cb385 | 325 | } else if (STR_IN_SET(key, "luks.key", "rd.luks.key") && value) { |
66a78c2b | 326 | |
6cd5b12a JJ |
327 | r = sscanf(value, "%m[0-9a-fA-F-]=%ms", &uuid, &uuid_value); |
328 | if (r == 2) { | |
329 | d = get_crypto_device(uuid); | |
330 | if (!d) | |
331 | return log_oom(); | |
332 | ||
333 | free(d->keyfile); | |
334 | d->keyfile = uuid_value; | |
335 | uuid_value = NULL; | |
336 | } else if (free_and_strdup(&arg_default_keyfile, value)) | |
141a79f4 | 337 | return log_oom(); |
7ab064a6 | 338 | |
baade8cc JJ |
339 | } else if (STR_IN_SET(key, "luks.name", "rd.luks.name") && value) { |
340 | ||
341 | r = sscanf(value, "%m[0-9a-fA-F-]=%ms", &uuid, &uuid_value); | |
342 | if (r == 2) { | |
343 | d = get_crypto_device(uuid); | |
344 | if (!d) | |
345 | return log_oom(); | |
346 | ||
347 | d->create = arg_whitelist = true; | |
348 | ||
349 | free(d->name); | |
350 | d->name = uuid_value; | |
351 | uuid_value = NULL; | |
352 | } else | |
353 | log_warning("Failed to parse luks name switch %s. Ignoring.", value); | |
354 | ||
85013844 | 355 | } |
66a78c2b | 356 | |
24a988e9 | 357 | return 0; |
66a78c2b LP |
358 | } |
359 | ||
0fa9e53d JJ |
360 | static int add_crypttab_devices(void) { |
361 | struct stat st; | |
362 | unsigned crypttab_line = 0; | |
7fd1b19b | 363 | _cleanup_fclose_ FILE *f = NULL; |
e23a0ce8 | 364 | |
0fa9e53d JJ |
365 | if (!arg_read_crypttab) |
366 | return 0; | |
367 | ||
368 | f = fopen("/etc/crypttab", "re"); | |
369 | if (!f) { | |
370 | if (errno != ENOENT) | |
371 | log_error_errno(errno, "Failed to open /etc/crypttab: %m"); | |
372 | return 0; | |
e23a0ce8 LP |
373 | } |
374 | ||
0fa9e53d JJ |
375 | if (fstat(fileno(f), &st) < 0) { |
376 | log_error_errno(errno, "Failed to stat /etc/crypttab: %m"); | |
377 | return 0; | |
378 | } | |
e23a0ce8 | 379 | |
0fa9e53d JJ |
380 | /* If we readd support for specifying passphrases |
381 | * directly in crypttab we should upgrade the warning | |
382 | * below, though possibly only if a passphrase is | |
383 | * specified directly. */ | |
384 | if (st.st_mode & 0005) | |
385 | log_debug("/etc/crypttab is world-readable. This is usually not a good idea."); | |
e23a0ce8 | 386 | |
0fa9e53d JJ |
387 | for (;;) { |
388 | int r, k; | |
389 | char line[LINE_MAX], *l, *uuid; | |
390 | crypto_device *d = NULL; | |
391 | _cleanup_free_ char *name = NULL, *device = NULL, *keyfile = NULL, *options = NULL; | |
4c12626c | 392 | |
0fa9e53d JJ |
393 | if (!fgets(line, sizeof(line), f)) |
394 | break; | |
66a78c2b | 395 | |
0fa9e53d | 396 | crypttab_line++; |
141a79f4 | 397 | |
0fa9e53d JJ |
398 | l = strstrip(line); |
399 | if (*l == '#' || *l == 0) | |
400 | continue; | |
66a78c2b | 401 | |
0fa9e53d JJ |
402 | k = sscanf(l, "%ms %ms %ms %ms", &name, &device, &keyfile, &options); |
403 | if (k < 2 || k > 4) { | |
404 | log_error("Failed to parse /etc/crypttab:%u, ignoring.", crypttab_line); | |
405 | continue; | |
406 | } | |
66a78c2b | 407 | |
0fa9e53d JJ |
408 | uuid = startswith(device, "UUID="); |
409 | if (!uuid) | |
410 | uuid = path_startswith(device, "/dev/disk/by-uuid/"); | |
411 | if (!uuid) | |
412 | uuid = startswith(name, "luks-"); | |
413 | if (uuid) | |
414 | d = hashmap_get(arg_disks, uuid); | |
8973790e | 415 | |
0fa9e53d JJ |
416 | if (arg_whitelist && !d) { |
417 | log_info("Not creating device '%s' because it was not specified on the kernel command line.", name); | |
418 | continue; | |
8973790e LP |
419 | } |
420 | ||
0fa9e53d JJ |
421 | r = create_disk(name, device, keyfile, (d && d->options) ? d->options : options); |
422 | if (r < 0) | |
423 | return r; | |
8973790e | 424 | |
0fa9e53d JJ |
425 | if (d) |
426 | d->create = false; | |
427 | } | |
8973790e | 428 | |
0fa9e53d JJ |
429 | return 0; |
430 | } | |
66a78c2b | 431 | |
0fa9e53d JJ |
432 | static int add_proc_cmdline_devices(void) { |
433 | int r; | |
434 | Iterator i; | |
435 | crypto_device *d; | |
66a78c2b | 436 | |
0fa9e53d JJ |
437 | HASHMAP_FOREACH(d, arg_disks, i) { |
438 | const char *options; | |
baade8cc | 439 | _cleanup_free_ char *device = NULL; |
66a78c2b | 440 | |
0fa9e53d JJ |
441 | if (!d->create) |
442 | continue; | |
e23a0ce8 | 443 | |
baade8cc JJ |
444 | if (!d->name) { |
445 | d->name = strappend("luks-", d->uuid); | |
446 | if (!d->name) | |
447 | return log_oom(); | |
448 | } | |
e23a0ce8 | 449 | |
0fa9e53d JJ |
450 | device = strappend("UUID=", d->uuid); |
451 | if (!device) | |
452 | return log_oom(); | |
7ab064a6 | 453 | |
0fa9e53d JJ |
454 | if (d->options) |
455 | options = d->options; | |
456 | else if (arg_default_options) | |
457 | options = arg_default_options; | |
458 | else | |
459 | options = "timeout=0"; | |
141a79f4 | 460 | |
baade8cc | 461 | r = create_disk(d->name, device, d->keyfile ?: arg_default_keyfile, options); |
0fa9e53d JJ |
462 | if (r < 0) |
463 | return r; | |
e23a0ce8 LP |
464 | } |
465 | ||
0fa9e53d JJ |
466 | return 0; |
467 | } | |
e23a0ce8 | 468 | |
0fa9e53d JJ |
469 | int main(int argc, char *argv[]) { |
470 | int r = EXIT_FAILURE; | |
e23a0ce8 | 471 | |
0fa9e53d JJ |
472 | if (argc > 1 && argc != 4) { |
473 | log_error("This program takes three or no arguments."); | |
474 | return EXIT_FAILURE; | |
475 | } | |
e23a0ce8 | 476 | |
0fa9e53d JJ |
477 | if (argc > 1) |
478 | arg_dest = argv[1]; | |
e23a0ce8 | 479 | |
0fa9e53d JJ |
480 | log_set_target(LOG_TARGET_SAFE); |
481 | log_parse_environment(); | |
482 | log_open(); | |
e2cb60fa | 483 | |
0fa9e53d | 484 | umask(0022); |
e23a0ce8 | 485 | |
0fa9e53d JJ |
486 | arg_disks = hashmap_new(&string_hash_ops); |
487 | if (!arg_disks) | |
488 | goto cleanup; | |
7ab064a6 | 489 | |
0fa9e53d JJ |
490 | r = parse_proc_cmdline(parse_proc_cmdline_item); |
491 | if (r < 0) { | |
492 | log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m"); | |
493 | r = EXIT_FAILURE; | |
494 | } | |
7ab064a6 | 495 | |
0fa9e53d JJ |
496 | if (!arg_enabled) { |
497 | r = EXIT_SUCCESS; | |
498 | goto cleanup; | |
e23a0ce8 LP |
499 | } |
500 | ||
0fa9e53d JJ |
501 | if (add_crypttab_devices() < 0) |
502 | goto cleanup; | |
503 | ||
504 | if (add_proc_cmdline_devices() < 0) | |
505 | goto cleanup; | |
506 | ||
507 | r = EXIT_SUCCESS; | |
141a79f4 ZJS |
508 | |
509 | cleanup: | |
0fa9e53d JJ |
510 | free_arg_disks(); |
511 | free(arg_default_options); | |
512 | free(arg_default_keyfile); | |
141a79f4 | 513 | |
0fa9e53d | 514 | return r; |
e23a0ce8 | 515 | } |