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 24.1.164
- compare with another revision
- download diff
- download tarball
- view history from revision 24.1.164
- Committer: Björn Påhlsson
- Date: 2010-09-12 18:23:40 UTC
- mfrom: (237.2.189 mandos)
- mto: (237.7.1 mandos)
- mto: This revision was merged to the branch mainline in revision 270.
- Revision ID: belorn@fukt.bsnet.se-20100912182340-09gzhdzd2a4zde5y
merge
- files removed:
- bugs.xml
- 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 © 2010-2017 Teddy Hogeborn
6
* Copyright © 2010-2017 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_pid[] = "/dev/.initramfs/plymouth.pid";
61
/* Used by Ubuntu 11.10 (Oneiric Ocelot) */
62
const char plymouth_pid[] = "/run/initramfs/plymouth.pid";
63
30
const char plymouth_pid[] = "/dev/.initramfs/plymouth.pid";
64
31
const char plymouth_path[] = "/bin/plymouth";
65
32
const char plymouthd_path[] = "/sbin/plymouthd";
66
const char *plymouthd_default_argv[] = {"/sbin/plymouthd",
67
"--mode=boot",
33
const char *plymouthd_default_argv[] = {"/sbin/plymouthd", "--mode=boot",
68
34
"--attach-to-session",
35
"--pid-file=/dev/.initramfs/plymouth.pid",
69
36
NULL };
70
37
71
38
static void termination_handler(__attribute__((unused))int signum){
75
42
interrupted_by_signal = 1;
76
43
}
77
44
78
/* Function to use when printing errors */
79
__attribute__((format (gnu_printf, 3, 4)))
80
void error_plus(int status, int errnum, const char *formatstring,
81
...){
82
va_list ap;
83
char *text;
84
int ret;
85
86
va_start(ap, formatstring);
87
ret = vasprintf(&text, formatstring, ap);
88
if(ret == -1){
89
fprintf(stderr, "Mandos plugin %s: ",
90
program_invocation_short_name);
91
vfprintf(stderr, formatstring, ap);
92
fprintf(stderr, ": ");
93
fprintf(stderr, "%s\n", strerror(errnum));
94
error(status, errno, "vasprintf while printing error");
95
return;
96
}
97
fprintf(stderr, "Mandos plugin ");
98
error(status, errnum, "%s", text);
99
free(text);
100
}
101
102
45
/* Create prompt string */
103
46
char *makeprompt(void){
104
47
int ret = 0;
105
48
char *prompt;
106
49
const char *const cryptsource = getenv("cryptsource");
107
50
const char *const crypttarget = getenv("crypttarget");
108
const char prompt_start[] = "Unlocking the disk";
109
const char prompt_end[] = "Enter passphrase";
51
const char prompt_start[] = "Enter passphrase to unlock the disk";
110
52
111
53
if(cryptsource == NULL){
112
54
if(crypttarget == NULL){
113
ret = asprintf(&prompt, "%s\n%s", prompt_start, prompt_end);
55
ret = asprintf(&prompt, "%s: ", prompt_start);
114
56
} else {
115
ret = asprintf(&prompt, "%s (%s)\n%s", prompt_start,
116
crypttarget, prompt_end);
57
ret = asprintf(&prompt, "%s (%s): ", prompt_start,
58
crypttarget);
117
59
}
118
60
} else {
119
61
if(crypttarget == NULL){
120
ret = asprintf(&prompt, "%s %s\n%s", prompt_start, cryptsource,
121
prompt_end);
62
ret = asprintf(&prompt, "%s %s: ", prompt_start, cryptsource);
122
63
} else {
123
ret = asprintf(&prompt, "%s %s (%s)\n%s", prompt_start,
124
cryptsource, crypttarget, prompt_end);
64
ret = asprintf(&prompt, "%s %s (%s): ", prompt_start,
65
cryptsource, crypttarget);
125
66
}
126
67
}
127
68
if(ret == -1){
138
79
bool become_a_daemon(void){
139
80
int ret = setuid(geteuid());
140
81
if(ret == -1){
141
error_plus(0, errno, "setuid");
82
error(0, errno, "setuid");
142
83
}
143
84
144
85
setsid();
145
86
ret = chdir("/");
146
87
if(ret == -1){
147
error_plus(0, errno, "chdir");
88
error(0, errno, "chdir");
148
89
return false;
149
90
}
150
91
ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
151
92
if(ret == -1){
152
error_plus(0, errno, "dup2");
93
error(0, errno, "dup2");
153
94
return false;
154
95
}
155
96
return true;
156
97
}
157
98
158
__attribute__((nonnull (2, 3)))
159
99
bool exec_and_wait(pid_t *pid_return, const char *path,
160
const char * const *argv, bool interruptable,
100
const char **argv, bool interruptable,
161
101
bool daemonize){
162
102
int status;
163
103
int ret;
164
104
pid_t pid;
165
105
pid = fork();
166
106
if(pid == -1){
167
error_plus(0, errno, "fork");
107
error(0, errno, "fork");
168
108
return false;
169
109
}
170
110
if(pid == 0){
174
114
_exit(EX_OSERR);
175
115
}
176
116
}
177
178
char **new_argv = malloc(sizeof(const char *));
179
if(new_argv == NULL){
180
error_plus(0, errno, "malloc");
181
_exit(EX_OSERR);
182
}
183
char **tmp;
117
118
char **new_argv = NULL;
119
char *tmp;
184
120
int i = 0;
185
for (; argv[i] != NULL; i++){
186
tmp = realloc(new_argv, sizeof(const char *) * ((size_t)i + 2));
187
if(tmp == NULL){
188
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");
189
125
free(new_argv);
190
_exit(EX_OSERR);
126
_exit(EXIT_FAILURE);
191
127
}
192
new_argv = tmp;
128
new_argv = (char **)tmp;
193
129
new_argv[i] = strdup(argv[i]);
194
130
}
195
new_argv[i] = NULL;
131
new_argv[i] = (char *) NULL;
196
132
197
133
execv(path, (char *const *)new_argv);
198
error_plus(0, errno, "execv");
134
error(0, errno, "execv");
199
135
_exit(EXIT_FAILURE);
200
136
}
201
137
if(pid_return != NULL){
210
146
return false;
211
147
}
212
148
if(ret == -1){
213
error_plus(0, errno, "waitpid");
149
error(0, errno, "waitpid");
214
150
return false;
215
151
}
216
if(WIFEXITED(status) and (WEXITSTATUS(status) == 0)){
152
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
217
153
return true;
218
154
}
219
155
return false;
220
156
}
221
157
222
__attribute__((nonnull))
223
158
int is_plymouth(const struct dirent *proc_entry){
224
159
int ret;
225
160
{
226
uintmax_t proc_id;
161
uintmax_t maxvalue;
227
162
char *tmp;
228
163
errno = 0;
229
proc_id = strtoumax(proc_entry->d_name, &tmp, 10);
164
maxvalue = strtoumax(proc_entry->d_name, &tmp, 10);
230
165
231
if(errno != 0 or *tmp != '\0'
232
or proc_id != (uintmax_t)((pid_t)proc_id)){
166
if(errno != 0 or *tmp != '\0' or maxvalue != (uintmax_t)((pid_t)maxvalue)){
233
167
return 0;
234
168
}
235
169
}
236
char exe_target[sizeof(plymouthd_path)];
170
char exe_target[sizeof(plymouth_path)];
237
171
char *exe_link;
238
172
ret = asprintf(&exe_link, "/proc/%s/exe", proc_entry->d_name);
239
173
if(ret == -1){
240
error_plus(0, errno, "asprintf");
174
error(0, errno, "asprintf");
241
175
return 0;
242
176
}
243
177
244
178
struct stat exe_stat;
245
179
ret = lstat(exe_link, &exe_stat);
246
180
if(ret == -1){
247
181
free(exe_link);
248
182
if(errno != ENOENT){
249
error_plus(0, errno, "lstat");
183
error(0, errno, "lstat");
250
184
}
251
185
return 0;
252
186
}
257
191
free(exe_link);
258
192
return 0;
259
193
}
260
194
261
195
ssize_t sret = readlink(exe_link, exe_target, sizeof(exe_target));
262
196
free(exe_link);
263
if((sret != (ssize_t)sizeof(plymouthd_path)-1) or
264
(memcmp(plymouthd_path, exe_target,
265
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)){
266
200
return 0;
267
201
}
268
202
return 1;
270
204
271
205
pid_t get_pid(void){
272
206
int ret;
273
uintmax_t proc_id = 0;
274
207
FILE *pidfile = fopen(plymouth_pid, "r");
275
/* Try the new pid file location */
208
uintmax_t maxvalue = 0;
276
209
if(pidfile != NULL){
277
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
210
ret = fscanf(pidfile, "%" SCNuMAX, &maxvalue);
278
211
if(ret != 1){
279
proc_id = 0;
212
maxvalue = 0;
280
213
}
281
214
fclose(pidfile);
282
215
}
283
/* Try the old pid file location */
284
if(proc_id == 0){
285
pidfile = fopen(plymouth_pid, "r");
286
if(pidfile != NULL){
287
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
288
if(ret != 1){
289
proc_id = 0;
290
}
291
fclose(pidfile);
292
}
293
}
294
/* Look for a plymouth process */
295
if(proc_id == 0){
296
struct dirent **direntries = NULL;
216
if(maxvalue == 0){
217
struct dirent **direntries;
297
218
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
298
if(ret == -1){
299
error_plus(0, errno, "scandir");
300
}
301
if(ret > 0){
302
ret = sscanf(direntries[0]->d_name, "%" SCNuMAX, &proc_id);
303
if(ret < 0){
304
error_plus(0, errno, "sscanf");
305
}
306
}
307
/* scandir might preallocate for this variable (man page unclear).
308
even if ret == 0, therefore we need to free it. */
309
free(direntries);
219
sscanf(direntries[0]->d_name, "%" SCNuMAX, &maxvalue);
310
220
}
311
221
pid_t pid;
312
pid = (pid_t)proc_id;
313
if((uintmax_t)pid == proc_id){
222
pid = (pid_t)maxvalue;
223
if((uintmax_t)pid == maxvalue){
314
224
return pid;
315
225
}
316
226
317
227
return 0;
318
228
}
319
229
320
char **getargv(pid_t pid){
230
const char **getargv(pid_t pid){
321
231
int cl_fd;
322
232
char *cmdline_filename;
323
233
ssize_t sret;
326
236
ret = asprintf(&cmdline_filename, "/proc/%" PRIuMAX "/cmdline",
327
237
(uintmax_t)pid);
328
238
if(ret == -1){
329
error_plus(0, errno, "asprintf");
239
error(0, errno, "asprintf");
330
240
return NULL;
331
241
}
332
242
334
244
cl_fd = open(cmdline_filename, O_RDONLY);
335
245
free(cmdline_filename);
336
246
if(cl_fd == -1){
337
error_plus(0, errno, "open");
247
error(0, errno, "open");
338
248
return NULL;
339
249
}
340
250
348
258
if(cmdline_len + blocksize > cmdline_allocated){
349
259
tmp = realloc(cmdline, cmdline_allocated + blocksize);
350
260
if(tmp == NULL){
351
error_plus(0, errno, "realloc");
261
error(0, errno, "realloc");
352
262
free(cmdline);
353
263
close(cl_fd);
354
264
return NULL;
361
271
sret = read(cl_fd, cmdline + cmdline_len,
362
272
cmdline_allocated - cmdline_len);
363
273
if(sret == -1){
364
error_plus(0, errno, "read");
274
error(0, errno, "read");
365
275
free(cmdline);
366
276
close(cl_fd);
367
277
return NULL;
370
280
} while(sret != 0);
371
281
ret = close(cl_fd);
372
282
if(ret == -1){
373
error_plus(0, errno, "close");
283
error(0, errno, "close");
374
284
free(cmdline);
375
285
return NULL;
376
286
}
377
287
378
288
/* we got cmdline and cmdline_len, ignore rest... */
379
char **argv = malloc((argz_count(cmdline, cmdline_len) + 1)
380
* sizeof(char *)); /* Get number of args */
381
if(argv == NULL){
382
error_plus(0, errno, "argv = malloc()");
383
free(cmdline);
384
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;
385
301
}
386
argz_extract(cmdline, cmdline_len, argv); /* Create argv */
302
argv[argv_size] = NULL;
387
303
return argv;
388
304
}
389
305
398
314
/* test -x /bin/plymouth */
399
315
ret = access(plymouth_path, X_OK);
400
316
if(ret == -1){
401
/* Plymouth is probably not installed. Don't print an error
402
message, just exit. */
403
exit(EX_UNAVAILABLE);
317
exit(EXIT_FAILURE);
404
318
}
405
319
406
320
{ /* Add signal handlers */
407
321
struct sigaction old_action,
408
322
new_action = { .sa_handler = termination_handler,
409
323
.sa_flags = 0 };
410
324
sigemptyset(&new_action.sa_mask);
411
for(int *sig = (int[]){ SIGINT, SIGHUP, SIGTERM, 0 };
412
*sig != 0; sig++){
325
for(int *sig = (int[]){ SIGINT, SIGHUP, SIGTERM, 0 }; *sig != 0; sig++){
413
326
ret = sigaddset(&new_action.sa_mask, *sig);
414
327
if(ret == -1){
415
error_plus(EX_OSERR, errno, "sigaddset");
328
error(0, errno, "sigaddset");
329
exit(EX_OSERR);
416
330
}
417
331
ret = sigaction(*sig, NULL, &old_action);
418
332
if(ret == -1){
419
error_plus(EX_OSERR, errno, "sigaction");
333
error(0, errno, "sigaction");
334
exit(EX_OSERR);
420
335
}
421
336
if(old_action.sa_handler != SIG_IGN){
422
337
ret = sigaction(*sig, &new_action, NULL);
423
338
if(ret == -1){
424
error_plus(EX_OSERR, errno, "sigaction");
339
error(0, errno, "sigaction");
340
exit(EX_OSERR);
425
341
}
426
342
}
427
343
}
428
344
}
429
345
430
346
/* plymouth --ping */
431
347
bret = exec_and_wait(&plymouth_command_pid, plymouth_path,
432
(const char *[])
433
{ plymouth_path, "--ping", NULL },
348
(const char *[]){ (const char *)plymouth_path, (const char *)"--ping", (const char *)NULL},
434
349
true, false);
435
350
if(not bret){
436
351
if(interrupted_by_signal){
437
352
kill_and_wait(plymouth_command_pid);
438
exit(EXIT_FAILURE);
439
353
}
440
/* Plymouth is probably not running. Don't print an error
441
message, just exit. */
442
exit(EX_UNAVAILABLE);
354
exit(EXIT_FAILURE);
443
355
}
444
356
445
357
prompt = makeprompt();
446
358
ret = asprintf(&prompt_arg, "--prompt=%s", prompt);
447
359
free(prompt);
448
360
if(ret == -1){
449
error_plus(EX_OSERR, errno, "asprintf");
361
error(0, errno, "asprintf");
362
exit(EXIT_FAILURE);
450
363
}
451
364
452
365
/* plymouth ask-for-password --prompt="$prompt" */
453
bret = exec_and_wait(&plymouth_command_pid,
454
plymouth_path, (const char *[])
455
{ plymouth_path, "ask-for-password",
456
prompt_arg, NULL },
366
bret = exec_and_wait(&plymouth_command_pid, plymouth_path,
367
(const char *[]){plymouth_path, "ask-for-password", prompt_arg, NULL},
457
368
true, false);
458
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
459
378
if(bret){
460
379
exit(EXIT_SUCCESS);
461
380
}
462
if(not interrupted_by_signal){
463
/* exec_and_wait failed for some other reason */
464
exit(EXIT_FAILURE);
465
}
466
kill_and_wait(plymouth_command_pid);
467
381
468
char **plymouthd_argv = NULL;
382
const char **plymouthd_argv = NULL;
469
383
pid_t pid = get_pid();
470
384
if(pid == 0){
471
error_plus(0, 0, "plymouthd pid not found");
385
error(0, 0, "plymouthd pid not found");
472
386
} else {
473
387
plymouthd_argv = getargv(pid);
474
388
}
389
if(plymouthd_argv == NULL){
390
plymouthd_argv = plymouthd_default_argv;
391
}
475
392
476
bret = exec_and_wait(NULL, plymouth_path, (const char *[])
477
{ plymouth_path, "quit", NULL },
478
false, false);
479
if(not bret){
480
if(plymouthd_argv != NULL){
481
free(*plymouthd_argv);
482
free(plymouthd_argv);
483
}
484
exit(EXIT_FAILURE);
485
}
486
bret = exec_and_wait(NULL, plymouthd_path,
487
(plymouthd_argv != NULL)
488
? (const char * const *)plymouthd_argv
489
: plymouthd_default_argv,
490
false, true);
491
if(plymouthd_argv != NULL){
492
free(*plymouthd_argv);
493
free(plymouthd_argv);
494
}
495
if(not bret){
496
exit(EXIT_FAILURE);
497
}
498
exec_and_wait(NULL, plymouth_path, (const char *[])
499
{ plymouth_path, "show-splash", NULL },
500
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);
501
404
exit(EXIT_FAILURE);
502
405
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0