To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/plymouth.c
- browse files at revision 566
- compare with another revision
- download diff
- download tarball
- view history from revision 566
- Committer: Teddy Hogeborn
- Date: 2012-05-01 20:48:00 UTC
- Revision ID: teddy@recompile.se-20120501204800-0wkzdkcd3epzci45
* mandos (main): Simplify and shorten code selecting user and group ID
to switch to.
to switch to.
- files added:
- initramfs-tools-hook-conf
- files removed:
- bugs.xml
- debian/tests
- debian/upstream
- dracut-module
- 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 © 2010-2021 Teddy Hogeborn
6
* Copyright © 2010-2021 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 © 2010-2012 Teddy Hogeborn
6
* Copyright © 2010-2012 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
78
__attribute__((format (gnu_printf, 3, 4)))
112
79
void error_plus(int status, int errnum, const char *formatstring,
117
84
118
85
va_start(ap, formatstring);
119
86
ret = vasprintf(&text, formatstring, ap);
120
if(ret == -1){
87
if (ret == -1){
121
88
fprintf(stderr, "Mandos plugin %s: ",
122
89
program_invocation_short_name);
123
90
vfprintf(stderr, formatstring, ap);
189
156
190
157
__attribute__((nonnull (2, 3)))
191
158
bool exec_and_wait(pid_t *pid_return, const char *path,
192
const char * const * const argv, bool interruptable,
159
const char **argv, bool interruptable,
193
160
bool daemonize){
194
161
int status;
195
162
int ret;
196
163
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
164
pid = fork();
205
165
if(pid == -1){
206
166
error_plus(0, errno, "fork");
214
174
}
215
175
}
216
176
217
char **new_argv = malloc(sizeof(const char *));
218
if(new_argv == NULL){
219
error_plus(0, errno, "malloc");
220
_exit(EX_OSERR);
221
}
177
char **new_argv = NULL;
222
178
char **tmp;
223
179
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");
180
for (; argv[i]!=NULL; i++){
181
tmp = realloc(new_argv, sizeof(const char *) * ((size_t)i + 1));
182
if (tmp == NULL){
183
error_plus(0, errno, "realloc");
239
184
free(new_argv);
240
185
_exit(EX_OSERR);
241
186
}
257
202
and ((not interrupted_by_signal)
258
203
or (not interruptable)));
259
204
if(interrupted_by_signal and interruptable){
260
if(debug){
261
fprintf_plus(stderr, "Interrupted by signal\n");
262
}
263
205
return false;
264
206
}
265
207
if(ret == -1){
266
208
error_plus(0, errno, "waitpid");
267
209
return false;
268
210
}
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
211
if(WIFEXITED(status) and (WEXITSTATUS(status) == 0)){
279
212
return true;
280
213
}
344
277
}
345
278
/* Try the old pid file location */
346
279
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");
280
pidfile = fopen(plymouth_pid, "r");
359
281
if(pidfile != NULL){
360
282
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
361
283
if(ret != 1){
368
290
if(proc_id == 0){
369
291
struct dirent **direntries = NULL;
370
292
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
371
if(ret == -1){
293
if (ret == -1){
372
294
error_plus(0, errno, "scandir");
373
295
}
374
if(ret > 0){
375
for(int i = ret-1; i >= 0; i--){
376
if(proc_id == 0){
377
ret = sscanf(direntries[i]->d_name, "%" SCNuMAX, &proc_id);
378
if(ret < 0){
379
error_plus(0, errno, "sscanf");
380
}
381
}
382
free(direntries[i]);
296
if (ret > 0){
297
ret = sscanf(direntries[0]->d_name, "%" SCNuMAX, &proc_id);
298
if (ret < 0){
299
error_plus(0, errno, "sscanf");
383
300
}
384
301
}
385
302
/* scandir might preallocate for this variable (man page unclear).
395
312
return 0;
396
313
}
397
314
398
char **getargv(pid_t pid){
315
const char **getargv(pid_t pid){
399
316
int cl_fd;
400
317
char *cmdline_filename;
401
318
ssize_t sret;
462
379
return NULL;
463
380
}
464
381
argz_extract(cmdline, cmdline_len, argv); /* Create argv */
465
return argv;
382
return (const char **)argv;
466
383
}
467
384
468
385
int main(__attribute__((unused))int argc,
469
386
__attribute__((unused))char **argv){
470
char *prompt = NULL;
387
char *prompt;
471
388
char *prompt_arg;
472
389
pid_t plymouth_command_pid;
473
390
int ret;
474
391
bool bret;
475
392
476
{
477
struct argp_option options[] = {
478
{ .name = "prompt", .key = 128, .arg = "PROMPT",
479
.doc = "The prompt to show" },
480
{ .name = "debug", .key = 129,
481
.doc = "Debug mode" },
482
{ .name = NULL }
483
};
484
485
__attribute__((nonnull(3)))
486
error_t parse_opt (int key, char *arg, __attribute__((unused))
487
struct argp_state *state){
488
errno = 0;
489
switch (key){
490
case 128: /* --prompt */
491
prompt = arg;
492
if(debug){
493
fprintf_plus(stderr, "Custom prompt \"%s\"\n", prompt);
494
}
495
break;
496
case 129: /* --debug */
497
debug = true;
498
break;
499
default:
500
return ARGP_ERR_UNKNOWN;
501
}
502
return errno;
503
}
504
505
struct argp argp = { .options = options, .parser = parse_opt,
506
.args_doc = "",
507
.doc = "Mandos plymouth -- Read and"
508
" output a password" };
509
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, NULL, NULL);
510
switch(ret){
511
case 0:
512
break;
513
case ENOMEM:
514
default:
515
errno = ret;
516
error_plus(0, errno, "argp_parse");
517
return EX_OSERR;
518
case EINVAL:
519
error_plus(0, errno, "argp_parse");
520
return EX_USAGE;
521
}
522
}
523
524
393
/* test -x /bin/plymouth */
525
394
ret = access(plymouth_path, X_OK);
526
395
if(ret == -1){
527
396
/* Plymouth is probably not installed. Don't print an error
528
397
message, just exit. */
529
if(debug){
530
fprintf_plus(stderr, "Plymouth (%s) not found\n",
531
plymouth_path);
532
}
533
398
exit(EX_UNAVAILABLE);
534
399
}
535
400
569
434
}
570
435
/* Plymouth is probably not running. Don't print an error
571
436
message, just exit. */
572
if(debug){
573
fprintf_plus(stderr, "Plymouth not running\n");
574
}
575
437
exit(EX_UNAVAILABLE);
576
438
}
577
439
578
if(prompt != NULL){
579
ret = asprintf(&prompt_arg, "--prompt=%s", prompt);
580
} else {
581
char *made_prompt = makeprompt();
582
ret = asprintf(&prompt_arg, "--prompt=%s", made_prompt);
583
free(made_prompt);
584
}
440
prompt = makeprompt();
441
ret = asprintf(&prompt_arg, "--prompt=%s", prompt);
442
free(prompt);
585
443
if(ret == -1){
586
444
error_plus(EX_OSERR, errno, "asprintf");
587
445
}
588
446
589
447
/* plymouth ask-for-password --prompt="$prompt" */
590
if(debug){
591
fprintf_plus(stderr, "Prompting for password via Plymouth\n");
592
}
593
448
bret = exec_and_wait(&plymouth_command_pid,
594
449
plymouth_path, (const char *[])
595
450
{ plymouth_path, "ask-for-password",
605
460
}
606
461
kill_and_wait(plymouth_command_pid);
607
462
608
char **plymouthd_argv = NULL;
463
const char **plymouthd_argv;
609
464
pid_t pid = get_pid();
610
465
if(pid == 0){
611
466
error_plus(0, 0, "plymouthd pid not found");
467
plymouthd_argv = plymouthd_default_argv;
612
468
} else {
613
469
plymouthd_argv = getargv(pid);
614
470
}
617
473
{ plymouth_path, "quit", NULL },
618
474
false, false);
619
475
if(not bret){
620
if(plymouthd_argv != NULL){
621
free(*plymouthd_argv);
622
free(plymouthd_argv);
623
}
624
476
exit(EXIT_FAILURE);
625
477
}
626
bret = exec_and_wait(NULL, plymouthd_path,
627
(plymouthd_argv != NULL)
628
? (const char * const *)plymouthd_argv
629
: plymouthd_default_argv,
478
bret = exec_and_wait(NULL, plymouthd_path, plymouthd_argv,
630
479
false, true);
631
if(plymouthd_argv != NULL){
632
free(*plymouthd_argv);
633
free(plymouthd_argv);
634
}
635
480
if(not bret){
636
481
exit(EXIT_FAILURE);
637
482
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0