To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to plugins.d/plymouth.c
- browse files at revision 24.1.159
- compare with another revision
- download diff
- download tarball
- view history from revision 24.1.159
- Committer: Björn Påhlsson
- Date: 2010-09-08 19:12:04 UTC
- mto: (237.7.1 mandos)
- mto: This revision was merged to the branch mainline in revision 270.
- Revision ID: belorn@fukt.bsnet.se-20100908191204-svjb4wktrd0unu3m
added approval to mandos-ctl
- files added:
- initramfs-tools-hook-conf
- files removed:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/plymouth.c
1
/* -*- coding: utf-8 -*- */
2
/*
3
* Plymouth - Read a password from Plymouth and output it
4
*
5
* Copyright © 2010-2018 Teddy Hogeborn
6
* Copyright © 2010-2018 Björn Påhlsson
7
*
8
* This file is part of Mandos.
9
*
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
14
*
15
* Mandos is distributed in the hope that it will be useful, but
16
* WITHOUT ANY WARRANTY; without even the implied warranty of
17
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18
* General Public License for more details.
19
*
20
* You should have received a copy of the GNU General Public License
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
22
*
23
* Contact the authors at <mandos@recompile.se>.
24
*/
25
26
1
#define _GNU_SOURCE /* asprintf(), TEMP_FAILURE_RETRY() */
27
2
#include <signal.h> /* sig_atomic_t, struct sigaction,
28
3
sigemptyset(), sigaddset(), SIGINT,
31
6
#include <stdbool.h> /* bool, false, true */
32
7
#include <fcntl.h> /* open(), O_RDONLY */
33
8
#include <iso646.h> /* and, or, not*/
34
#include <sys/types.h> /* size_t, ssize_t, pid_t, struct
35
dirent, waitpid() */
9
#include <sys/types.h> /* size_t, ssize_t, pid_t, struct dirent,
10
waitpid() */
36
11
#include <sys/wait.h> /* waitpid() */
37
12
#include <stddef.h> /* NULL */
38
13
#include <string.h> /* strchr(), memcmp() */
39
#include <stdio.h> /* asprintf(), perror(), fopen(),
40
fscanf(), vasprintf(), fprintf(),
41
vfprintf() */
42
#include <unistd.h> /* close(), readlink(), read(),
43
fork(), setsid(), chdir(), dup2(),
14
#include <stdio.h> /* asprintf(), perror(), fopen(), fscanf() */
15
#include <unistd.h> /* close(), readlink(), read(), fork()
16
setsid(), chdir(), dup2()
44
17
STDERR_FILENO, execv(), access() */
45
18
#include <stdlib.h> /* free(), EXIT_FAILURE, realloc(),
46
19
EXIT_SUCCESS, malloc(), _exit(),
48
21
#include <dirent.h> /* scandir(), alphasort() */
49
22
#include <inttypes.h> /* intmax_t, strtoumax(), SCNuMAX */
50
23
#include <sys/stat.h> /* struct stat, lstat() */
51
#include <sysexits.h> /* EX_OSERR, EX_UNAVAILABLE */
24
#include <sysexits.h> /* EX_OSERR */
52
25
#include <error.h> /* error() */
53
26
#include <errno.h> /* TEMP_FAILURE_RETRY */
54
#include <argz.h> /* argz_count(), argz_extract() */
55
#include <stdarg.h> /* va_list, va_start(), ... */
27
#include <stdarg.h>
56
28
57
29
sig_atomic_t interrupted_by_signal = 0;
58
59
/* Used by Ubuntu 11.04 (Natty Narwahl) */
60
const char plymouth_old_old_pid[] = "/dev/.initramfs/plymouth.pid";
61
/* Used by Ubuntu 11.10 (Oneiric Ocelot) */
62
const char plymouth_old_pid[] = "/run/initramfs/plymouth.pid";
63
/* Used by Debian 9 (stretch) */
64
const char plymouth_pid[] = "/run/plymouth/pid";
65
30
const char plymouth_pid[] = "/dev/.initramfs/plymouth.pid";
66
31
const char plymouth_path[] = "/bin/plymouth";
67
32
const char plymouthd_path[] = "/sbin/plymouthd";
68
const char *plymouthd_default_argv[] = {"/sbin/plymouthd",
69
"--mode=boot",
33
const char *plymouthd_default_argv[] = {"/sbin/plymouthd", "--mode=boot",
70
34
"--attach-to-session",
35
"--pid-file=/dev/.initramfs/plymouth.pid",
71
36
NULL };
72
37
73
38
static void termination_handler(__attribute__((unused))int signum){
77
42
interrupted_by_signal = 1;
78
43
}
79
44
80
/* Function to use when printing errors */
81
__attribute__((format (gnu_printf, 3, 4)))
82
void error_plus(int status, int errnum, const char *formatstring,
83
...){
84
va_list ap;
85
char *text;
86
int ret;
87
88
va_start(ap, formatstring);
89
ret = vasprintf(&text, formatstring, ap);
90
if(ret == -1){
91
fprintf(stderr, "Mandos plugin %s: ",
92
program_invocation_short_name);
93
vfprintf(stderr, formatstring, ap);
94
fprintf(stderr, ": ");
95
fprintf(stderr, "%s\n", strerror(errnum));
96
error(status, errno, "vasprintf while printing error");
97
return;
98
}
99
fprintf(stderr, "Mandos plugin ");
100
error(status, errnum, "%s", text);
101
free(text);
102
}
103
104
45
/* Create prompt string */
105
46
char *makeprompt(void){
106
47
int ret = 0;
107
48
char *prompt;
108
49
const char *const cryptsource = getenv("cryptsource");
109
50
const char *const crypttarget = getenv("crypttarget");
110
const char prompt_start[] = "Unlocking the disk";
111
const char prompt_end[] = "Enter passphrase";
51
const char prompt_start[] = "Enter passphrase to unlock the disk";
112
52
113
53
if(cryptsource == NULL){
114
54
if(crypttarget == NULL){
115
ret = asprintf(&prompt, "%s\n%s", prompt_start, prompt_end);
55
ret = asprintf(&prompt, "%s: ", prompt_start);
116
56
} else {
117
ret = asprintf(&prompt, "%s (%s)\n%s", prompt_start,
118
crypttarget, prompt_end);
57
ret = asprintf(&prompt, "%s (%s): ", prompt_start,
58
crypttarget);
119
59
}
120
60
} else {
121
61
if(crypttarget == NULL){
122
ret = asprintf(&prompt, "%s %s\n%s", prompt_start, cryptsource,
123
prompt_end);
62
ret = asprintf(&prompt, "%s %s: ", prompt_start, cryptsource);
124
63
} else {
125
ret = asprintf(&prompt, "%s %s (%s)\n%s", prompt_start,
126
cryptsource, crypttarget, prompt_end);
64
ret = asprintf(&prompt, "%s %s (%s): ", prompt_start,
65
cryptsource, crypttarget);
127
66
}
128
67
}
129
68
if(ret == -1){
140
79
bool become_a_daemon(void){
141
80
int ret = setuid(geteuid());
142
81
if(ret == -1){
143
error_plus(0, errno, "setuid");
82
error(0, errno, "setuid");
144
83
}
145
84
146
85
setsid();
147
86
ret = chdir("/");
148
87
if(ret == -1){
149
error_plus(0, errno, "chdir");
88
error(0, errno, "chdir");
150
89
return false;
151
90
}
152
91
ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
153
92
if(ret == -1){
154
error_plus(0, errno, "dup2");
93
error(0, errno, "dup2");
155
94
return false;
156
95
}
157
96
return true;
158
97
}
159
98
160
__attribute__((nonnull (2, 3)))
161
99
bool exec_and_wait(pid_t *pid_return, const char *path,
162
const char * const *argv, bool interruptable,
100
const char **argv, bool interruptable,
163
101
bool daemonize){
164
102
int status;
165
103
int ret;
166
104
pid_t pid;
167
105
pid = fork();
168
106
if(pid == -1){
169
error_plus(0, errno, "fork");
107
error(0, errno, "fork");
170
108
return false;
171
109
}
172
110
if(pid == 0){
176
114
_exit(EX_OSERR);
177
115
}
178
116
}
179
180
char **new_argv = malloc(sizeof(const char *));
181
if(new_argv == NULL){
182
error_plus(0, errno, "malloc");
183
_exit(EX_OSERR);
184
}
185
char **tmp;
117
118
char **new_argv = NULL;
119
char *tmp;
186
120
int i = 0;
187
for (; argv[i] != NULL; i++){
188
tmp = realloc(new_argv, sizeof(const char *) * ((size_t)i + 2));
189
if(tmp == NULL){
190
error_plus(0, errno, "realloc");
121
for (; argv[i]!=(char *)NULL; i++){
122
tmp = realloc(new_argv, sizeof(const char *) * ((size_t)i + 1));
123
if (tmp == NULL){
124
error(0, errno, "realloc");
191
125
free(new_argv);
192
_exit(EX_OSERR);
126
_exit(EXIT_FAILURE);
193
127
}
194
new_argv = tmp;
128
new_argv = (char **)tmp;
195
129
new_argv[i] = strdup(argv[i]);
196
130
}
197
new_argv[i] = NULL;
131
new_argv[i] = (char *) NULL;
198
132
199
133
execv(path, (char *const *)new_argv);
200
error_plus(0, errno, "execv");
134
error(0, errno, "execv");
201
135
_exit(EXIT_FAILURE);
202
136
}
203
137
if(pid_return != NULL){
212
146
return false;
213
147
}
214
148
if(ret == -1){
215
error_plus(0, errno, "waitpid");
149
error(0, errno, "waitpid");
216
150
return false;
217
151
}
218
if(WIFEXITED(status) and (WEXITSTATUS(status) == 0)){
152
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
219
153
return true;
220
154
}
221
155
return false;
222
156
}
223
157
224
__attribute__((nonnull))
225
158
int is_plymouth(const struct dirent *proc_entry){
226
159
int ret;
227
160
{
228
uintmax_t proc_id;
161
uintmax_t maxvalue;
229
162
char *tmp;
230
163
errno = 0;
231
proc_id = strtoumax(proc_entry->d_name, &tmp, 10);
164
maxvalue = strtoumax(proc_entry->d_name, &tmp, 10);
232
165
233
if(errno != 0 or *tmp != '\0'
234
or proc_id != (uintmax_t)((pid_t)proc_id)){
166
if(errno != 0 or *tmp != '\0' or maxvalue != (uintmax_t)((pid_t)maxvalue)){
235
167
return 0;
236
168
}
237
169
}
238
char exe_target[sizeof(plymouthd_path)];
170
char exe_target[sizeof(plymouth_path)];
239
171
char *exe_link;
240
172
ret = asprintf(&exe_link, "/proc/%s/exe", proc_entry->d_name);
241
173
if(ret == -1){
242
error_plus(0, errno, "asprintf");
174
error(0, errno, "asprintf");
243
175
return 0;
244
176
}
245
177
246
178
struct stat exe_stat;
247
179
ret = lstat(exe_link, &exe_stat);
248
180
if(ret == -1){
249
181
free(exe_link);
250
182
if(errno != ENOENT){
251
error_plus(0, errno, "lstat");
183
error(0, errno, "lstat");
252
184
}
253
185
return 0;
254
186
}
259
191
free(exe_link);
260
192
return 0;
261
193
}
262
194
263
195
ssize_t sret = readlink(exe_link, exe_target, sizeof(exe_target));
264
196
free(exe_link);
265
if((sret != (ssize_t)sizeof(plymouthd_path)-1) or
266
(memcmp(plymouthd_path, exe_target,
267
sizeof(plymouthd_path)-1) != 0)){
197
if((sret != (ssize_t)sizeof(plymouth_path)-1) or
198
(memcmp(plymouth_path, exe_target,
199
sizeof(plymouth_path)-1) != 0)){
268
200
return 0;
269
201
}
270
202
return 1;
272
204
273
205
pid_t get_pid(void){
274
206
int ret;
275
uintmax_t proc_id = 0;
276
207
FILE *pidfile = fopen(plymouth_pid, "r");
277
/* Try the new pid file location */
208
uintmax_t maxvalue = 0;
278
209
if(pidfile != NULL){
279
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
210
ret = fscanf(pidfile, "%" SCNuMAX, &maxvalue);
280
211
if(ret != 1){
281
proc_id = 0;
212
maxvalue = 0;
282
213
}
283
214
fclose(pidfile);
284
215
}
285
/* Try the old pid file location */
286
if(proc_id == 0){
287
pidfile = fopen(plymouth_old_pid, "r");
288
if(pidfile != NULL){
289
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
290
if(ret != 1){
291
proc_id = 0;
292
}
293
fclose(pidfile);
294
}
295
}
296
/* Try the old old pid file location */
297
if(proc_id == 0){
298
pidfile = fopen(plymouth_old_old_pid, "r");
299
if(pidfile != NULL){
300
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
301
if(ret != 1){
302
proc_id = 0;
303
}
304
fclose(pidfile);
305
}
306
}
307
/* Look for a plymouth process */
308
if(proc_id == 0){
309
struct dirent **direntries = NULL;
216
if(maxvalue == 0){
217
struct dirent **direntries;
310
218
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
311
if(ret == -1){
312
error_plus(0, errno, "scandir");
313
}
314
if(ret > 0){
315
for(int i = ret-1; i >= 0; i--){
316
if(proc_id == 0){
317
ret = sscanf(direntries[i]->d_name, "%" SCNuMAX, &proc_id);
318
if(ret < 0){
319
error_plus(0, errno, "sscanf");
320
}
321
}
322
free(direntries[i]);
323
}
324
}
325
/* scandir might preallocate for this variable (man page unclear).
326
even if ret == 0, therefore we need to free it. */
327
free(direntries);
219
sscanf(direntries[0]->d_name, "%" SCNuMAX, &maxvalue);
328
220
}
329
221
pid_t pid;
330
pid = (pid_t)proc_id;
331
if((uintmax_t)pid == proc_id){
222
pid = (pid_t)maxvalue;
223
if((uintmax_t)pid == maxvalue){
332
224
return pid;
333
225
}
334
226
335
227
return 0;
336
228
}
337
229
338
char **getargv(pid_t pid){
230
const char **getargv(pid_t pid){
339
231
int cl_fd;
340
232
char *cmdline_filename;
341
233
ssize_t sret;
344
236
ret = asprintf(&cmdline_filename, "/proc/%" PRIuMAX "/cmdline",
345
237
(uintmax_t)pid);
346
238
if(ret == -1){
347
error_plus(0, errno, "asprintf");
239
error(0, errno, "asprintf");
348
240
return NULL;
349
241
}
350
242
352
244
cl_fd = open(cmdline_filename, O_RDONLY);
353
245
free(cmdline_filename);
354
246
if(cl_fd == -1){
355
error_plus(0, errno, "open");
247
error(0, errno, "open");
356
248
return NULL;
357
249
}
358
250
366
258
if(cmdline_len + blocksize > cmdline_allocated){
367
259
tmp = realloc(cmdline, cmdline_allocated + blocksize);
368
260
if(tmp == NULL){
369
error_plus(0, errno, "realloc");
261
error(0, errno, "realloc");
370
262
free(cmdline);
371
263
close(cl_fd);
372
264
return NULL;
379
271
sret = read(cl_fd, cmdline + cmdline_len,
380
272
cmdline_allocated - cmdline_len);
381
273
if(sret == -1){
382
error_plus(0, errno, "read");
274
error(0, errno, "read");
383
275
free(cmdline);
384
276
close(cl_fd);
385
277
return NULL;
388
280
} while(sret != 0);
389
281
ret = close(cl_fd);
390
282
if(ret == -1){
391
error_plus(0, errno, "close");
283
error(0, errno, "close");
392
284
free(cmdline);
393
285
return NULL;
394
286
}
395
287
396
288
/* we got cmdline and cmdline_len, ignore rest... */
397
char **argv = malloc((argz_count(cmdline, cmdline_len) + 1)
398
* sizeof(char *)); /* Get number of args */
399
if(argv == NULL){
400
error_plus(0, errno, "argv = malloc()");
401
free(cmdline);
402
return NULL;
289
const char **argv = NULL;
290
size_t argv_size = 0;
291
for(char *arg = cmdline; arg-cmdline < (ssize_t)cmdline_len;
292
arg = strchr(arg, '\0')+1){
293
tmp = realloc(argv, ((++argv_size)+1)*sizeof(char *));
294
if(tmp == NULL){
295
error(0, errno, "realloc");
296
free(argv);
297
return NULL;
298
}
299
argv = (const char **)tmp;
300
argv[argv_size-1] = arg;
403
301
}
404
argz_extract(cmdline, cmdline_len, argv); /* Create argv */
302
argv[argv_size] = NULL;
405
303
return argv;
406
304
}
407
305
416
314
/* test -x /bin/plymouth */
417
315
ret = access(plymouth_path, X_OK);
418
316
if(ret == -1){
419
/* Plymouth is probably not installed. Don't print an error
420
message, just exit. */
421
exit(EX_UNAVAILABLE);
317
exit(EXIT_FAILURE);
422
318
}
423
319
424
320
{ /* Add signal handlers */
425
321
struct sigaction old_action,
426
322
new_action = { .sa_handler = termination_handler,
427
323
.sa_flags = 0 };
428
324
sigemptyset(&new_action.sa_mask);
429
for(int *sig = (int[]){ SIGINT, SIGHUP, SIGTERM, 0 };
430
*sig != 0; sig++){
325
for(int *sig = (int[]){ SIGINT, SIGHUP, SIGTERM, 0 }; *sig != 0; sig++){
431
326
ret = sigaddset(&new_action.sa_mask, *sig);
432
327
if(ret == -1){
433
error_plus(EX_OSERR, errno, "sigaddset");
328
error(0, errno, "sigaddset");
329
exit(EX_OSERR);
434
330
}
435
331
ret = sigaction(*sig, NULL, &old_action);
436
332
if(ret == -1){
437
error_plus(EX_OSERR, errno, "sigaction");
333
error(0, errno, "sigaction");
334
exit(EX_OSERR);
438
335
}
439
336
if(old_action.sa_handler != SIG_IGN){
440
337
ret = sigaction(*sig, &new_action, NULL);
441
338
if(ret == -1){
442
error_plus(EX_OSERR, errno, "sigaction");
339
error(0, errno, "sigaction");
340
exit(EX_OSERR);
443
341
}
444
342
}
445
343
}
446
344
}
447
345
448
346
/* plymouth --ping */
449
347
bret = exec_and_wait(&plymouth_command_pid, plymouth_path,
450
(const char *[])
451
{ plymouth_path, "--ping", NULL },
348
(const char *[]){ (const char *)plymouth_path, (const char *)"--ping", (const char *)NULL},
452
349
true, false);
453
350
if(not bret){
454
351
if(interrupted_by_signal){
455
352
kill_and_wait(plymouth_command_pid);
456
exit(EXIT_FAILURE);
457
353
}
458
/* Plymouth is probably not running. Don't print an error
459
message, just exit. */
460
exit(EX_UNAVAILABLE);
354
exit(EXIT_FAILURE);
461
355
}
462
356
463
357
prompt = makeprompt();
464
358
ret = asprintf(&prompt_arg, "--prompt=%s", prompt);
465
359
free(prompt);
466
360
if(ret == -1){
467
error_plus(EX_OSERR, errno, "asprintf");
361
error(0, errno, "asprintf");
362
exit(EXIT_FAILURE);
468
363
}
469
364
470
365
/* plymouth ask-for-password --prompt="$prompt" */
471
bret = exec_and_wait(&plymouth_command_pid,
472
plymouth_path, (const char *[])
473
{ plymouth_path, "ask-for-password",
474
prompt_arg, NULL },
366
bret = exec_and_wait(&plymouth_command_pid, plymouth_path,
367
(const char *[]){plymouth_path, "ask-for-password", prompt_arg, NULL},
475
368
true, false);
476
369
free(prompt_arg);
370
if(not bret){
371
if(interrupted_by_signal){
372
kill_and_wait(plymouth_command_pid);
373
} else {
374
exit(EXIT_FAILURE);
375
}
376
}
377
477
378
if(bret){
478
379
exit(EXIT_SUCCESS);
479
380
}
480
if(not interrupted_by_signal){
481
/* exec_and_wait failed for some other reason */
482
exit(EXIT_FAILURE);
483
}
484
kill_and_wait(plymouth_command_pid);
485
381
486
char **plymouthd_argv = NULL;
382
const char **plymouthd_argv = NULL;
487
383
pid_t pid = get_pid();
488
384
if(pid == 0){
489
error_plus(0, 0, "plymouthd pid not found");
385
error(0, 0, "plymouthd pid not found");
490
386
} else {
491
387
plymouthd_argv = getargv(pid);
492
388
}
389
if(plymouthd_argv == NULL){
390
plymouthd_argv = plymouthd_default_argv;
391
}
493
392
494
bret = exec_and_wait(NULL, plymouth_path, (const char *[])
495
{ plymouth_path, "quit", NULL },
496
false, false);
497
if(not bret){
498
if(plymouthd_argv != NULL){
499
free(*plymouthd_argv);
500
free(plymouthd_argv);
501
}
502
exit(EXIT_FAILURE);
503
}
504
bret = exec_and_wait(NULL, plymouthd_path,
505
(plymouthd_argv != NULL)
506
? (const char * const *)plymouthd_argv
507
: plymouthd_default_argv,
508
false, true);
509
if(plymouthd_argv != NULL){
510
free(*plymouthd_argv);
511
free(plymouthd_argv);
512
}
513
if(not bret){
514
exit(EXIT_FAILURE);
515
}
516
exec_and_wait(NULL, plymouth_path, (const char *[])
517
{ plymouth_path, "show-splash", NULL },
518
false, false);
393
bret = exec_and_wait(NULL, plymouth_path,
394
(const char *[]){plymouth_path, "quit", NULL}, false, false);
395
if(not bret){
396
exit(EXIT_FAILURE);
397
}
398
bret = exec_and_wait(NULL, plymouthd_path, plymouthd_argv, false, true);
399
if(not bret){
400
exit(EXIT_FAILURE);
401
}
402
exec_and_wait(NULL, plymouth_path,
403
(const char *[]){ plymouth_path, "show-splash", NULL }, false, false);
519
404
exit(EXIT_FAILURE);
520
405
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0