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- Committer: Björn Påhlsson
- Date: 2011-12-21 00:29:33 UTC
- mfrom: (237.12.15 mandos-persistent)
- mto: (237.11.22 teddy) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 290.
- Revision ID: belorn@recompile.se-20111221002933-6sc0a64o1ns2s2s8
Working persistant state
- files added:
- initramfs-tools-hook-conf
- files removed:
- bugs.xml
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/plymouth.c
2
2
/*
3
3
* Plymouth - Read a password from Plymouth and output it
4
4
*
5
* Copyright © 2010-2022 Teddy Hogeborn
6
* Copyright © 2010-2022 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
5
* Copyright © 2010-2011 Teddy Hogeborn
6
* Copyright © 2010-2011 Björn Påhlsson
7
*
8
* This program is free software: you can redistribute it and/or
9
* modify it under the terms of the GNU General Public License as
10
* published by the Free Software Foundation, either version 3 of the
11
* License, or (at your option) any later version.
12
*
13
* This program is distributed in the hope that it will be useful, but
16
14
* WITHOUT ANY WARRANTY; without even the implied warranty of
17
15
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18
16
* General Public License for more details.
19
17
*
20
18
* You should have received a copy of the GNU General Public License
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
19
* along with this program. If not, see
20
* <http://www.gnu.org/licenses/>.
22
21
*
23
22
* Contact the authors at <mandos@recompile.se>.
24
23
*/
25
24
26
#define _GNU_SOURCE /* program_invocation_short_name,
27
vasprintf(), asprintf(),
28
TEMP_FAILURE_RETRY() */
29
#include <sys/types.h> /* sig_atomic_t, pid_t, setuid(),
30
geteuid(), setsid() */
31
#include <argp.h> /* argp_program_version,
32
argp_program_bug_address,
33
struct argp_option,
34
struct argp_state,
35
ARGP_ERR_UNKNOWN, struct argp,
36
argp_parse(), ARGP_IN_ORDER */
37
#include <stddef.h> /* NULL, size_t */
25
#define _GNU_SOURCE /* asprintf(), TEMP_FAILURE_RETRY() */
26
#include <signal.h> /* sig_atomic_t, struct sigaction,
27
sigemptyset(), sigaddset(), SIGINT,
28
SIGHUP, SIGTERM, sigaction(),
29
kill(), SIG_IGN */
38
30
#include <stdbool.h> /* bool, false, true */
39
#include <stdio.h> /* FILE, fprintf(), vfprintf(),
40
vasprintf(), stderr, asprintf(),
41
fopen(), fscanf(), fclose(),
42
sscanf() */
43
#include <stdarg.h> /* va_list, va_start(), vfprintf() */
44
#include <errno.h> /* program_invocation_short_name,
45
errno, ENOMEM, EINTR, ENOENT,
46
error_t, EINVAL */
47
#include <string.h> /* strerror(), strdup(), memcmp() */
31
#include <fcntl.h> /* open(), O_RDONLY */
32
#include <iso646.h> /* and, or, not*/
33
#include <sys/types.h> /* size_t, ssize_t, pid_t, struct
34
dirent, waitpid() */
35
#include <sys/wait.h> /* waitpid() */
36
#include <stddef.h> /* NULL */
37
#include <string.h> /* strchr(), memcmp() */
38
#include <stdio.h> /* asprintf(), perror(), fopen(),
39
fscanf(), vasprintf(), fprintf(),
40
vfprintf() */
41
#include <unistd.h> /* close(), readlink(), read(),
42
fork(), setsid(), chdir(), dup2(),
43
STDERR_FILENO, execv(), access() */
44
#include <stdlib.h> /* free(), EXIT_FAILURE, realloc(),
45
EXIT_SUCCESS, malloc(), _exit(),
46
getenv() */
47
#include <dirent.h> /* scandir(), alphasort() */
48
#include <inttypes.h> /* intmax_t, strtoumax(), SCNuMAX */
49
#include <sys/stat.h> /* struct stat, lstat() */
50
#include <sysexits.h> /* EX_OSERR, EX_UNAVAILABLE */
48
51
#include <error.h> /* error() */
49
#include <stdlib.h> /* free(), getenv(), malloc(),
50
reallocarray(), realloc(),
51
EXIT_FAILURE, EXIT_SUCCESS */
52
#include <unistd.h> /* TEMP_FAILURE_RETRY(), setuid(),
53
geteuid(), setsid(), chdir(),
54
dup2(), STDERR_FILENO,
55
STDOUT_FILENO, fork(), _exit(),
56
execv(), ssize_t, readlink(),
57
close(), read(), access(), X_OK */
58
#include <signal.h> /* kill(), SIGTERM, struct sigaction,
59
sigemptyset(), SIGINT, SIGHUP,
60
sigaddset(), SIG_IGN */
61
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
62
WEXITSTATUS(), WIFSIGNALED(),
63
WTERMSIG() */
64
#include <iso646.h> /* not, and, or */
65
#include <sysexits.h> /* EX_OSERR, EX_USAGE,
66
EX_UNAVAILABLE */
67
#include <stdint.h> /* SIZE_MAX */
68
#include <dirent.h> /* struct dirent, scandir(),
69
alphasort() */
70
#include <inttypes.h> /* uintmax_t, strtoumax(), SCNuMAX,
71
PRIuMAX */
72
#include <sys/stat.h> /* struct stat, lstat(), S_ISLNK() */
73
#include <fcntl.h> /* open(), O_RDONLY */
52
#include <errno.h> /* TEMP_FAILURE_RETRY */
74
53
#include <argz.h> /* argz_count(), argz_extract() */
54
#include <stdarg.h> /* va_list, va_start(), ... */
75
55
76
56
sig_atomic_t interrupted_by_signal = 0;
77
const char *argp_program_version = "plymouth " VERSION;
78
const char *argp_program_bug_address = "<mandos@recompile.se>";
79
57
80
58
/* Used by Ubuntu 11.04 (Natty Narwahl) */
81
const char plymouth_old_old_pid[] = "/dev/.initramfs/plymouth.pid";
59
const char plymouth_old_pid[] = "/dev/.initramfs/plymouth.pid";
82
60
/* Used by Ubuntu 11.10 (Oneiric Ocelot) */
83
const char plymouth_old_pid[] = "/run/initramfs/plymouth.pid";
84
/* Used by Debian 9 (stretch) */
85
const char plymouth_pid[] = "/run/plymouth/pid";
61
const char plymouth_pid[] = "/run/initramfs/plymouth.pid";
86
62
87
63
const char plymouth_path[] = "/bin/plymouth";
88
64
const char plymouthd_path[] = "/sbin/plymouthd";
90
66
"--mode=boot",
91
67
"--attach-to-session",
92
68
NULL };
93
bool debug = false;
94
69
95
70
static void termination_handler(__attribute__((unused))int signum){
96
71
if(interrupted_by_signal){
99
74
interrupted_by_signal = 1;
100
75
}
101
76
102
__attribute__((format (gnu_printf, 2, 3), nonnull))
103
int fprintf_plus(FILE *stream, const char *format, ...){
104
va_list ap;
105
va_start (ap, format);
106
fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name);
107
return vfprintf(stream, format, ap);
108
}
109
110
77
/* Function to use when printing errors */
111
__attribute__((format (gnu_printf, 3, 4)))
112
78
void error_plus(int status, int errnum, const char *formatstring,
113
79
...){
114
80
va_list ap;
117
83
118
84
va_start(ap, formatstring);
119
85
ret = vasprintf(&text, formatstring, ap);
120
if(ret == -1){
86
if (ret == -1){
121
87
fprintf(stderr, "Mandos plugin %s: ",
122
88
program_invocation_short_name);
123
89
vfprintf(stderr, formatstring, ap);
187
153
return true;
188
154
}
189
155
190
__attribute__((nonnull (2, 3)))
191
156
bool exec_and_wait(pid_t *pid_return, const char *path,
192
const char * const * const argv, bool interruptable,
157
const char **argv, bool interruptable,
193
158
bool daemonize){
194
159
int status;
195
160
int ret;
196
161
pid_t pid;
197
if(debug){
198
for(const char * const *arg = argv; *arg != NULL; arg++){
199
fprintf_plus(stderr, "exec_and_wait arg: %s\n", *arg);
200
}
201
fprintf_plus(stderr, "exec_and_wait end of args\n");
202
}
203
204
162
pid = fork();
205
163
if(pid == -1){
206
164
error_plus(0, errno, "fork");
214
172
}
215
173
}
216
174
217
char **new_argv = malloc(sizeof(const char *));
218
if(new_argv == NULL){
219
error_plus(0, errno, "malloc");
220
_exit(EX_OSERR);
221
}
175
char **new_argv = NULL;
222
176
char **tmp;
223
177
int i = 0;
224
for (; argv[i] != NULL; i++){
225
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
226
tmp = reallocarray(new_argv, ((size_t)i + 2),
227
sizeof(const char *));
228
#else
229
if(((size_t)i + 2) > (SIZE_MAX / sizeof(const char *))){
230
/* overflow */
231
tmp = NULL;
232
errno = ENOMEM;
233
} else {
234
tmp = realloc(new_argv, ((size_t)i + 2) * sizeof(const char *));
235
}
236
#endif
237
if(tmp == NULL){
238
error_plus(0, errno, "reallocarray");
178
for (; argv[i]!=NULL; i++){
179
tmp = realloc(new_argv, sizeof(const char *) * ((size_t)i + 1));
180
if (tmp == NULL){
181
error_plus(0, errno, "realloc");
239
182
free(new_argv);
240
183
_exit(EX_OSERR);
241
184
}
257
200
and ((not interrupted_by_signal)
258
201
or (not interruptable)));
259
202
if(interrupted_by_signal and interruptable){
260
if(debug){
261
fprintf_plus(stderr, "Interrupted by signal\n");
262
}
263
203
return false;
264
204
}
265
205
if(ret == -1){
266
206
error_plus(0, errno, "waitpid");
267
207
return false;
268
208
}
269
if(debug){
270
if(WIFEXITED(status)){
271
fprintf_plus(stderr, "exec_and_wait exited: %d\n",
272
WEXITSTATUS(status));
273
} else if(WIFSIGNALED(status)) {
274
fprintf_plus(stderr, "exec_and_wait signaled: %d\n",
275
WTERMSIG(status));
276
}
277
}
278
209
if(WIFEXITED(status) and (WEXITSTATUS(status) == 0)){
279
210
return true;
280
211
}
281
212
return false;
282
213
}
283
214
284
__attribute__((nonnull))
285
215
int is_plymouth(const struct dirent *proc_entry){
286
216
int ret;
287
217
{
288
uintmax_t proc_id;
218
uintmax_t maxvalue;
289
219
char *tmp;
290
220
errno = 0;
291
proc_id = strtoumax(proc_entry->d_name, &tmp, 10);
221
maxvalue = strtoumax(proc_entry->d_name, &tmp, 10);
292
222
293
223
if(errno != 0 or *tmp != '\0'
294
or proc_id != (uintmax_t)((pid_t)proc_id)){
224
or maxvalue != (uintmax_t)((pid_t)maxvalue)){
295
225
return 0;
296
226
}
297
227
}
332
262
333
263
pid_t get_pid(void){
334
264
int ret;
335
uintmax_t proc_id = 0;
265
uintmax_t maxvalue = 0;
336
266
FILE *pidfile = fopen(plymouth_pid, "r");
337
267
/* Try the new pid file location */
338
268
if(pidfile != NULL){
339
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
269
ret = fscanf(pidfile, "%" SCNuMAX, &maxvalue);
340
270
if(ret != 1){
341
proc_id = 0;
271
maxvalue = 0;
342
272
}
343
273
fclose(pidfile);
344
274
}
345
275
/* Try the old pid file location */
346
if(proc_id == 0){
347
pidfile = fopen(plymouth_old_pid, "r");
348
if(pidfile != NULL){
349
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
350
if(ret != 1){
351
proc_id = 0;
352
}
353
fclose(pidfile);
354
}
355
}
356
/* Try the old old pid file location */
357
if(proc_id == 0){
358
pidfile = fopen(plymouth_old_old_pid, "r");
359
if(pidfile != NULL){
360
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
361
if(ret != 1){
362
proc_id = 0;
276
if(maxvalue == 0){
277
pidfile = fopen(plymouth_pid, "r");
278
if(pidfile != NULL){
279
ret = fscanf(pidfile, "%" SCNuMAX, &maxvalue);
280
if(ret != 1){
281
maxvalue = 0;
363
282
}
364
283
fclose(pidfile);
365
284
}
366
285
}
367
286
/* Look for a plymouth process */
368
if(proc_id == 0){
287
if(maxvalue == 0){
369
288
struct dirent **direntries = NULL;
370
289
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
371
if(ret == -1){
290
if (ret == -1){
372
291
error_plus(0, errno, "scandir");
373
292
}
374
if(ret > 0){
375
const int num_entries = ret;
376
for(int i = 0; i < num_entries; i++){
377
if(proc_id == 0){
378
ret = sscanf(direntries[i]->d_name, "%" SCNuMAX, &proc_id);
379
if(ret < 0){
380
error_plus(0, errno, "sscanf");
381
}
382
}
383
free(direntries[i]);
293
if (ret > 0){
294
ret = sscanf(direntries[0]->d_name, "%" SCNuMAX, &maxvalue);
295
if (ret < 0){
296
error_plus(0, errno, "sscanf");
384
297
}
385
298
}
386
299
/* scandir might preallocate for this variable (man page unclear).
388
301
free(direntries);
389
302
}
390
303
pid_t pid;
391
pid = (pid_t)proc_id;
392
if((uintmax_t)pid == proc_id){
304
pid = (pid_t)maxvalue;
305
if((uintmax_t)pid == maxvalue){
393
306
return pid;
394
307
}
395
308
396
309
return 0;
397
310
}
398
311
399
char **getargv(pid_t pid){
312
const char **getargv(pid_t pid){
400
313
int cl_fd;
401
314
char *cmdline_filename;
402
315
ssize_t sret;
463
376
return NULL;
464
377
}
465
378
argz_extract(cmdline, cmdline_len, argv); /* Create argv */
466
return argv;
379
return (const char **)argv;
467
380
}
468
381
469
382
int main(__attribute__((unused))int argc,
470
383
__attribute__((unused))char **argv){
471
char *prompt = NULL;
384
char *prompt;
472
385
char *prompt_arg;
473
386
pid_t plymouth_command_pid;
474
387
int ret;
475
388
bool bret;
476
389
477
{
478
struct argp_option options[] = {
479
{ .name = "prompt", .key = 128, .arg = "PROMPT",
480
.doc = "The prompt to show" },
481
{ .name = "debug", .key = 129,
482
.doc = "Debug mode" },
483
{ .name = NULL }
484
};
485
486
__attribute__((nonnull(3)))
487
error_t parse_opt (int key, char *arg, __attribute__((unused))
488
struct argp_state *state){
489
errno = 0;
490
switch (key){
491
case 128: /* --prompt */
492
prompt = arg;
493
if(debug){
494
fprintf_plus(stderr, "Custom prompt \"%s\"\n", prompt);
495
}
496
break;
497
case 129: /* --debug */
498
debug = true;
499
break;
500
default:
501
return ARGP_ERR_UNKNOWN;
502
}
503
return errno;
504
}
505
506
struct argp argp = { .options = options, .parser = parse_opt,
507
.args_doc = "",
508
.doc = "Mandos plymouth -- Read and"
509
" output a password" };
510
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, NULL, NULL);
511
switch(ret){
512
case 0:
513
break;
514
case ENOMEM:
515
default:
516
errno = ret;
517
error_plus(0, errno, "argp_parse");
518
return EX_OSERR;
519
case EINVAL:
520
error_plus(0, errno, "argp_parse");
521
return EX_USAGE;
522
}
523
}
524
525
390
/* test -x /bin/plymouth */
526
391
ret = access(plymouth_path, X_OK);
527
392
if(ret == -1){
528
393
/* Plymouth is probably not installed. Don't print an error
529
394
message, just exit. */
530
if(debug){
531
fprintf_plus(stderr, "Plymouth (%s) not found\n",
532
plymouth_path);
533
}
534
395
exit(EX_UNAVAILABLE);
535
396
}
536
397
570
431
}
571
432
/* Plymouth is probably not running. Don't print an error
572
433
message, just exit. */
573
if(debug){
574
fprintf_plus(stderr, "Plymouth not running\n");
575
}
576
434
exit(EX_UNAVAILABLE);
577
435
}
578
436
579
if(prompt != NULL){
580
ret = asprintf(&prompt_arg, "--prompt=%s", prompt);
581
} else {
582
char *made_prompt = makeprompt();
583
ret = asprintf(&prompt_arg, "--prompt=%s", made_prompt);
584
free(made_prompt);
585
}
437
prompt = makeprompt();
438
ret = asprintf(&prompt_arg, "--prompt=%s", prompt);
439
free(prompt);
586
440
if(ret == -1){
587
441
error_plus(EX_OSERR, errno, "asprintf");
588
442
}
589
443
590
444
/* plymouth ask-for-password --prompt="$prompt" */
591
if(debug){
592
fprintf_plus(stderr, "Prompting for password via Plymouth\n");
593
}
594
445
bret = exec_and_wait(&plymouth_command_pid,
595
446
plymouth_path, (const char *[])
596
447
{ plymouth_path, "ask-for-password",
606
457
}
607
458
kill_and_wait(plymouth_command_pid);
608
459
609
char **plymouthd_argv = NULL;
460
const char **plymouthd_argv;
610
461
pid_t pid = get_pid();
611
462
if(pid == 0){
612
463
error_plus(0, 0, "plymouthd pid not found");
464
plymouthd_argv = plymouthd_default_argv;
613
465
} else {
614
466
plymouthd_argv = getargv(pid);
615
467
}
618
470
{ plymouth_path, "quit", NULL },
619
471
false, false);
620
472
if(not bret){
621
if(plymouthd_argv != NULL){
622
free(*plymouthd_argv);
623
free(plymouthd_argv);
624
}
625
473
exit(EXIT_FAILURE);
626
474
}
627
bret = exec_and_wait(NULL, plymouthd_path,
628
(plymouthd_argv != NULL)
629
? (const char * const *)plymouthd_argv
630
: plymouthd_default_argv,
475
bret = exec_and_wait(NULL, plymouthd_path, plymouthd_argv,
631
476
false, true);
632
if(plymouthd_argv != NULL){
633
free(*plymouthd_argv);
634
free(plymouthd_argv);
635
}
636
477
if(not bret){
637
478
exit(EXIT_FAILURE);
638
479
}
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