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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 | ||
22 | #include <string.h> | |
23 | #include <errno.h> | |
24 | #include <unistd.h> | |
25 | ||
26 | #include "log.h" | |
27 | #include "util.h" | |
28 | #include "unit-name.h" | |
49e942b2 | 29 | #include "mkdir.h" |
66a78c2b LP |
30 | #include "virt.h" |
31 | #include "strv.h" | |
a860325e | 32 | #include "fileio.h" |
e23a0ce8 | 33 | |
66a78c2b LP |
34 | static const char *arg_dest = "/tmp"; |
35 | static bool arg_enabled = true; | |
36 | static bool arg_read_crypttab = true; | |
e23a0ce8 LP |
37 | |
38 | static bool has_option(const char *haystack, const char *needle) { | |
39 | const char *f = haystack; | |
40 | size_t l; | |
41 | ||
f653f683 LP |
42 | assert(needle); |
43 | ||
44 | if (!haystack) | |
45 | return false; | |
46 | ||
e23a0ce8 LP |
47 | l = strlen(needle); |
48 | ||
49 | while ((f = strstr(f, needle))) { | |
50 | ||
51 | if (f > haystack && f[-1] != ',') { | |
52 | f++; | |
53 | continue; | |
54 | } | |
55 | ||
aae5220d | 56 | if (f[l] != 0 && f[l] != ',') { |
e23a0ce8 LP |
57 | f++; |
58 | continue; | |
59 | } | |
60 | ||
61 | return true; | |
62 | } | |
63 | ||
64 | return false; | |
65 | } | |
66 | ||
67 | static int create_disk( | |
68 | const char *name, | |
69 | const char *device, | |
70 | const char *password, | |
71 | const char *options) { | |
72 | ||
24a988e9 HH |
73 | char _cleanup_free_ *p = NULL, *n = NULL, *d = NULL, *u = NULL, *from = NULL, *to = NULL, *e = NULL; |
74 | FILE _cleanup_fclose_ *f = NULL; | |
155da457 | 75 | bool noauto, nofail; |
e23a0ce8 LP |
76 | |
77 | assert(name); | |
78 | assert(device); | |
79 | ||
155da457 LP |
80 | noauto = has_option(options, "noauto"); |
81 | nofail = has_option(options, "nofail"); | |
82 | ||
35eb6b12 | 83 | n = unit_name_from_path_instance("systemd-cryptsetup", name, ".service"); |
24a988e9 HH |
84 | if (!n) |
85 | return log_oom(); | |
e23a0ce8 | 86 | |
b7def684 | 87 | p = strjoin(arg_dest, "/", n, NULL); |
24a988e9 HH |
88 | if (!p) |
89 | return log_oom(); | |
e23a0ce8 | 90 | |
f7f21d33 | 91 | u = fstab_node_to_udev_node(device); |
24a988e9 HH |
92 | if (!u) |
93 | return log_oom(); | |
e23a0ce8 | 94 | |
f7f21d33 | 95 | d = unit_name_from_path(u, ".device"); |
24a988e9 HH |
96 | if (!d) |
97 | return log_oom(); | |
e23a0ce8 | 98 | |
f7f21d33 LP |
99 | f = fopen(p, "wxe"); |
100 | if (!f) { | |
1cda32b8 | 101 | log_error("Failed to create unit file %s: %m", p); |
24a988e9 | 102 | return -errno; |
e23a0ce8 LP |
103 | } |
104 | ||
105 | fprintf(f, | |
6b1dc2bd | 106 | "# Automatically generated by systemd-cryptsetup-generator\n\n" |
e23a0ce8 | 107 | "[Unit]\n" |
a4477e68 | 108 | "Description=Cryptography Setup for %%I\n" |
1c732700 | 109 | "Documentation=man:systemd-cryptsetup@.service(8) man:crypttab(5)\n" |
1b64d026 | 110 | "SourcePath=/etc/crypttab\n" |
155da457 | 111 | "Conflicts=umount.target\n" |
e23a0ce8 | 112 | "DefaultDependencies=no\n" |
7f2cddae | 113 | "BindsTo=%s dev-mapper-%%i.device\n" |
e23a0ce8 | 114 | "After=systemd-readahead-collect.service systemd-readahead-replay.service %s\n" |
87e75fdd | 115 | "Before=umount.target\n", |
e23a0ce8 LP |
116 | d, d); |
117 | ||
155da457 LP |
118 | if (!nofail) |
119 | fprintf(f, | |
120 | "Before=cryptsetup.target\n"); | |
121 | ||
e23a0ce8 LP |
122 | if (password && (streq(password, "/dev/urandom") || |
123 | streq(password, "/dev/random") || | |
124 | streq(password, "/dev/hw_random"))) | |
1b64d026 | 125 | fputs("After=systemd-random-seed-load.service\n", f); |
87e75fdd | 126 | else |
1b64d026 | 127 | fputs("Before=local-fs.target\n", f); |
e23a0ce8 LP |
128 | |
129 | fprintf(f, | |
130 | "\n[Service]\n" | |
131 | "Type=oneshot\n" | |
132 | "RemainAfterExit=yes\n" | |
90724929 | 133 | "TimeoutSec=0\n" /* the binary handles timeouts anyway */ |
260ab287 | 134 | "ExecStart=" SYSTEMD_CRYPTSETUP_PATH " attach '%s' '%s' '%s' '%s'\n" |
7f4e0805 | 135 | "ExecStop=" SYSTEMD_CRYPTSETUP_PATH " detach '%s'\n", |
e23a0ce8 LP |
136 | name, u, strempty(password), strempty(options), |
137 | name); | |
138 | ||
f653f683 | 139 | if (has_option(options, "tmp")) |
e23a0ce8 | 140 | fprintf(f, |
50109038 | 141 | "ExecStartPost=/sbin/mke2fs '/dev/mapper/%s'\n", |
1d3399e6 | 142 | name); |
e23a0ce8 | 143 | |
f653f683 | 144 | if (has_option(options, "swap")) |
e23a0ce8 | 145 | fprintf(f, |
50109038 | 146 | "ExecStartPost=/sbin/mkswap '/dev/mapper/%s'\n", |
1d3399e6 | 147 | name); |
e23a0ce8 LP |
148 | |
149 | fflush(f); | |
150 | ||
151 | if (ferror(f)) { | |
1cda32b8 | 152 | log_error("Failed to write file %s: %m", p); |
24a988e9 | 153 | return -errno; |
e23a0ce8 LP |
154 | } |
155 | ||
24a988e9 HH |
156 | if (asprintf(&from, "../%s", n) < 0) |
157 | return log_oom(); | |
74715b82 | 158 | |
155da457 | 159 | if (!noauto) { |
e23a0ce8 | 160 | |
b7def684 | 161 | to = strjoin(arg_dest, "/", d, ".wants/", n, NULL); |
24a988e9 HH |
162 | if (!to) |
163 | return log_oom(); | |
e23a0ce8 | 164 | |
d2e54fae | 165 | mkdir_parents_label(to, 0755); |
e23a0ce8 LP |
166 | if (symlink(from, to) < 0) { |
167 | log_error("Failed to create symlink '%s' to '%s': %m", from, to); | |
24a988e9 | 168 | return -errno; |
e23a0ce8 | 169 | } |
2f8cd170 LP |
170 | |
171 | free(to); | |
155da457 | 172 | if (!nofail) |
b7def684 | 173 | to = strjoin(arg_dest, "/cryptsetup.target.requires/", n, NULL); |
155da457 | 174 | else |
b7def684 | 175 | to = strjoin(arg_dest, "/cryptsetup.target.wants/", n, NULL); |
24a988e9 HH |
176 | if (!to) |
177 | return log_oom(); | |
2f8cd170 | 178 | |
d2e54fae | 179 | mkdir_parents_label(to, 0755); |
155da457 LP |
180 | if (symlink(from, to) < 0) { |
181 | log_error("Failed to create symlink '%s' to '%s': %m", from, to); | |
24a988e9 | 182 | return -errno; |
2f8cd170 | 183 | } |
f7f21d33 | 184 | } |
74715b82 LP |
185 | |
186 | e = unit_name_escape(name); | |
608d41f3 LP |
187 | if (!e) |
188 | return log_oom(); | |
189 | ||
190 | free(to); | |
b7def684 | 191 | to = strjoin(arg_dest, "/dev-mapper-", e, ".device.requires/", n, NULL); |
24a988e9 HH |
192 | if (!to) |
193 | return log_oom(); | |
74715b82 | 194 | |
d2e54fae | 195 | mkdir_parents_label(to, 0755); |
74715b82 LP |
196 | if (symlink(from, to) < 0) { |
197 | log_error("Failed to create symlink '%s' to '%s': %m", from, to); | |
24a988e9 | 198 | return -errno; |
74715b82 LP |
199 | } |
200 | ||
24a988e9 | 201 | return 0; |
e23a0ce8 LP |
202 | } |
203 | ||
24a988e9 HH |
204 | static int parse_proc_cmdline(char ***arg_proc_cmdline_disks) { |
205 | char _cleanup_free_ *line = NULL; | |
206 | char *w = NULL, *state = NULL; | |
66a78c2b LP |
207 | int r; |
208 | size_t l; | |
209 | ||
210 | if (detect_container(NULL) > 0) | |
211 | return 0; | |
212 | ||
213 | r = read_one_line_file("/proc/cmdline", &line); | |
214 | if (r < 0) { | |
215 | log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r)); | |
216 | return 0; | |
217 | } | |
218 | ||
219 | FOREACH_WORD_QUOTED(w, l, line, state) { | |
24a988e9 | 220 | char _cleanup_free_ *word = NULL; |
66a78c2b LP |
221 | |
222 | word = strndup(w, l); | |
24a988e9 HH |
223 | if (!word) |
224 | return log_oom(); | |
66a78c2b LP |
225 | |
226 | if (startswith(word, "luks=")) { | |
227 | r = parse_boolean(word + 5); | |
228 | if (r < 0) | |
229 | log_warning("Failed to parse luks switch %s. Ignoring.", word + 5); | |
230 | else | |
231 | arg_enabled = r; | |
232 | ||
233 | } else if (startswith(word, "rd.luks=")) { | |
234 | ||
235 | if (in_initrd()) { | |
236 | r = parse_boolean(word + 8); | |
237 | if (r < 0) | |
238 | log_warning("Failed to parse luks switch %s. Ignoring.", word + 8); | |
239 | else | |
240 | arg_enabled = r; | |
241 | } | |
242 | ||
243 | } else if (startswith(word, "luks.crypttab=")) { | |
244 | r = parse_boolean(word + 14); | |
245 | if (r < 0) | |
246 | log_warning("Failed to parse luks crypttab switch %s. Ignoring.", word + 14); | |
247 | else | |
248 | arg_read_crypttab = r; | |
249 | ||
250 | } else if (startswith(word, "rd.luks.crypttab=")) { | |
251 | ||
252 | if (in_initrd()) { | |
253 | r = parse_boolean(word + 17); | |
254 | if (r < 0) | |
255 | log_warning("Failed to parse luks crypttab switch %s. Ignoring.", word + 17); | |
256 | else | |
257 | arg_read_crypttab = r; | |
258 | } | |
259 | ||
260 | } else if (startswith(word, "luks.uuid=")) { | |
e32530cb | 261 | if (strv_extend(arg_proc_cmdline_disks, word + 10) < 0) |
24a988e9 HH |
262 | return log_oom(); |
263 | ||
66a78c2b LP |
264 | } else if (startswith(word, "rd.luks.uuid=")) { |
265 | ||
266 | if (in_initrd()) { | |
e32530cb | 267 | if (strv_extend(arg_proc_cmdline_disks, word + 13) < 0) |
24a988e9 | 268 | return log_oom(); |
66a78c2b LP |
269 | } |
270 | ||
271 | } else if (startswith(word, "luks.") || | |
272 | (in_initrd() && startswith(word, "rd.luks."))) { | |
273 | ||
274 | log_warning("Unknown kernel switch %s. Ignoring.", word); | |
275 | } | |
66a78c2b LP |
276 | } |
277 | ||
24a988e9 | 278 | strv_uniq(*arg_proc_cmdline_disks); |
66a78c2b | 279 | |
24a988e9 | 280 | return 0; |
66a78c2b LP |
281 | } |
282 | ||
e23a0ce8 | 283 | int main(int argc, char *argv[]) { |
24a988e9 | 284 | FILE _cleanup_fclose_ *f = NULL; |
e23a0ce8 | 285 | unsigned n = 0; |
24a988e9 | 286 | int r = EXIT_SUCCESS; |
66a78c2b | 287 | char **i; |
24a988e9 HH |
288 | char _cleanup_strv_free_ **arg_proc_cmdline_disks_done = NULL; |
289 | char _cleanup_strv_free_ **arg_proc_cmdline_disks = NULL; | |
e23a0ce8 | 290 | |
07719a21 LP |
291 | if (argc > 1 && argc != 4) { |
292 | log_error("This program takes three or no arguments."); | |
e23a0ce8 LP |
293 | return EXIT_FAILURE; |
294 | } | |
295 | ||
2a796654 LP |
296 | if (argc > 1) |
297 | arg_dest = argv[1]; | |
e23a0ce8 | 298 | |
a6903061 | 299 | log_set_target(LOG_TARGET_SAFE); |
e23a0ce8 LP |
300 | log_parse_environment(); |
301 | log_open(); | |
302 | ||
4c12626c LP |
303 | umask(0022); |
304 | ||
24a988e9 | 305 | if (parse_proc_cmdline(&arg_proc_cmdline_disks) < 0) |
66a78c2b LP |
306 | return EXIT_FAILURE; |
307 | ||
24a988e9 HH |
308 | if (!arg_enabled) |
309 | return EXIT_SUCCESS; | |
66a78c2b | 310 | |
e2cb60fa HH |
311 | if (arg_read_crypttab) { |
312 | f = fopen("/etc/crypttab", "re"); | |
66a78c2b | 313 | |
e2cb60fa HH |
314 | if (!f) { |
315 | if (errno == ENOENT) | |
316 | r = EXIT_SUCCESS; | |
317 | else { | |
318 | r = EXIT_FAILURE; | |
319 | log_error("Failed to open /etc/crypttab: %m"); | |
320 | } | |
24a988e9 | 321 | } else for (;;) { |
e2cb60fa | 322 | char line[LINE_MAX], *l; |
24a988e9 | 323 | char _cleanup_free_ *name = NULL, *device = NULL, *password = NULL, *options = NULL; |
e2cb60fa | 324 | int k; |
66a78c2b | 325 | |
e2cb60fa HH |
326 | if (!fgets(line, sizeof(line), f)) |
327 | break; | |
66a78c2b | 328 | |
e2cb60fa | 329 | n++; |
66a78c2b | 330 | |
e2cb60fa HH |
331 | l = strstrip(line); |
332 | if (*l == '#' || *l == 0) | |
333 | continue; | |
e23a0ce8 | 334 | |
e2cb60fa HH |
335 | k = sscanf(l, "%ms %ms %ms %ms", &name, &device, &password, &options); |
336 | if (k < 2 || k > 4) { | |
337 | log_error("Failed to parse /etc/crypttab:%u, ignoring.", n); | |
338 | r = EXIT_FAILURE; | |
24a988e9 | 339 | continue; |
e2cb60fa | 340 | } |
e23a0ce8 | 341 | |
e2cb60fa HH |
342 | if (arg_proc_cmdline_disks) { |
343 | /* | |
344 | If luks UUIDs are specified on the kernel command line, use them as a filter | |
345 | for /etc/crypttab and only generate units for those. | |
346 | */ | |
347 | STRV_FOREACH(i, arg_proc_cmdline_disks) { | |
24a988e9 | 348 | char _cleanup_free_ *proc_device = NULL, *proc_name = NULL; |
e2cb60fa HH |
349 | const char *p = *i; |
350 | ||
351 | if (startswith(p, "luks-")) | |
352 | p += 5; | |
353 | ||
354 | proc_name = strappend("luks-", p); | |
355 | proc_device = strappend("UUID=", p); | |
356 | ||
24a988e9 HH |
357 | if (!proc_name || !proc_device) |
358 | return log_oom(); | |
359 | ||
e2cb60fa | 360 | if (streq(proc_device, device) || streq(proc_name, name)) { |
e2cb60fa HH |
361 | if (create_disk(name, device, password, options) < 0) |
362 | r = EXIT_FAILURE; | |
363 | ||
e32530cb | 364 | if (strv_extend(&arg_proc_cmdline_disks_done, p) < 0) |
24a988e9 | 365 | return log_oom(); |
e2cb60fa | 366 | } |
e2cb60fa HH |
367 | } |
368 | } else { | |
369 | if (create_disk(name, device, password, options) < 0) | |
370 | r = EXIT_FAILURE; | |
371 | } | |
e2cb60fa | 372 | } |
e23a0ce8 LP |
373 | } |
374 | ||
e2cb60fa HH |
375 | STRV_FOREACH(i, arg_proc_cmdline_disks) { |
376 | /* | |
377 | Generate units for those UUIDs, which were specified | |
378 | on the kernel command line and not yet written. | |
379 | */ | |
e23a0ce8 | 380 | |
24a988e9 | 381 | char _cleanup_free_ *name = NULL, *device = NULL; |
e2cb60fa | 382 | const char *p = *i; |
e23a0ce8 | 383 | |
e2cb60fa HH |
384 | if (startswith(p, "luks-")) |
385 | p += 5; | |
e23a0ce8 | 386 | |
e2cb60fa | 387 | if (strv_contains(arg_proc_cmdline_disks_done, p)) |
e23a0ce8 LP |
388 | continue; |
389 | ||
e2cb60fa HH |
390 | name = strappend("luks-", p); |
391 | device = strappend("UUID=", p); | |
392 | ||
24a988e9 HH |
393 | if (!name || !device) |
394 | return log_oom(); | |
e23a0ce8 | 395 | |
e2cb60fa | 396 | if (create_disk(name, device, NULL, "timeout=0") < 0) |
e23a0ce8 | 397 | r = EXIT_FAILURE; |
e23a0ce8 LP |
398 | } |
399 | ||
e23a0ce8 LP |
400 | return r; |
401 | } |