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- Committer: Björn Påhlsson
- Date: 2011-06-18 22:51:12 UTC
- mto: This revision was merged to the branch mainline in revision 485.
- Revision ID: belorn@fukt.bsnet.se-20110618225112-rnt2m4ek32758f80
using scandir instead of readdir
- 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
* Contact the authors at <mandos@recompile.se>.
22
* Contact the authors at <mandos@fukt.bsnet.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() */
40
#include <unistd.h> /* close(), readlink(), read(),
41
fork(), setsid(), chdir(), dup2(),
42
STDERR_FILENO, execv(), access() */
43
#include <stdlib.h> /* free(), EXIT_FAILURE, realloc(),
44
EXIT_SUCCESS, malloc(), _exit(),
45
getenv() */
46
#include <dirent.h> /* scandir(), alphasort() */
47
#include <inttypes.h> /* intmax_t, strtoumax(), SCNuMAX */
48
#include <sys/stat.h> /* struct stat, lstat() */
49
#include <sysexits.h> /* EX_OSERR, EX_UNAVAILABLE */
48
50
#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 */
51
#include <errno.h> /* TEMP_FAILURE_RETRY */
74
52
#include <argz.h> /* argz_count(), argz_extract() */
75
53
76
54
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
80
/* Used by Ubuntu 11.04 (Natty Narwahl) */
81
const char plymouth_old_old_pid[] = "/dev/.initramfs/plymouth.pid";
82
/* 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";
86
55
const char plymouth_pid[] = "/dev/.initramfs/plymouth.pid";
87
56
const char plymouth_path[] = "/bin/plymouth";
88
57
const char plymouthd_path[] = "/sbin/plymouthd";
89
58
const char *plymouthd_default_argv[] = {"/sbin/plymouthd",
90
59
"--mode=boot",
91
60
"--attach-to-session",
61
"--pid-file="
62
"/dev/.initramfs/"
63
"plymouth.pid",
92
64
NULL };
93
bool debug = false;
94
65
95
66
static void termination_handler(__attribute__((unused))int signum){
96
67
if(interrupted_by_signal){
99
70
interrupted_by_signal = 1;
100
71
}
101
72
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
/* Function to use when printing errors */
111
__attribute__((format (gnu_printf, 3, 4)))
112
void error_plus(int status, int errnum, const char *formatstring,
113
...){
114
va_list ap;
115
char *text;
116
int ret;
117
118
va_start(ap, formatstring);
119
ret = vasprintf(&text, formatstring, ap);
120
if(ret == -1){
121
fprintf(stderr, "Mandos plugin %s: ",
122
program_invocation_short_name);
123
vfprintf(stderr, formatstring, ap);
124
fprintf(stderr, ": ");
125
fprintf(stderr, "%s\n", strerror(errnum));
126
error(status, errno, "vasprintf while printing error");
127
return;
128
}
129
fprintf(stderr, "Mandos plugin ");
130
error(status, errnum, "%s", text);
131
free(text);
132
}
133
134
73
/* Create prompt string */
135
74
char *makeprompt(void){
136
75
int ret = 0;
170
109
bool become_a_daemon(void){
171
110
int ret = setuid(geteuid());
172
111
if(ret == -1){
173
error_plus(0, errno, "setuid");
112
error(0, errno, "setuid");
174
113
}
175
114
176
115
setsid();
177
116
ret = chdir("/");
178
117
if(ret == -1){
179
error_plus(0, errno, "chdir");
118
error(0, errno, "chdir");
180
119
return false;
181
120
}
182
121
ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
183
122
if(ret == -1){
184
error_plus(0, errno, "dup2");
123
error(0, errno, "dup2");
185
124
return false;
186
125
}
187
126
return true;
188
127
}
189
128
190
__attribute__((nonnull (2, 3)))
191
129
bool exec_and_wait(pid_t *pid_return, const char *path,
192
const char * const * const argv, bool interruptable,
130
const char **argv, bool interruptable,
193
131
bool daemonize){
194
132
int status;
195
133
int ret;
196
134
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
135
pid = fork();
205
136
if(pid == -1){
206
error_plus(0, errno, "fork");
137
error(0, errno, "fork");
207
138
return false;
208
139
}
209
140
if(pid == 0){
214
145
}
215
146
}
216
147
217
char **new_argv = malloc(sizeof(const char *));
218
if(new_argv == NULL){
219
error_plus(0, errno, "malloc");
220
_exit(EX_OSERR);
221
}
148
char **new_argv = NULL;
222
149
char **tmp;
223
150
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");
151
for (; argv[i]!=NULL; i++){
152
tmp = realloc(new_argv, sizeof(const char *) * ((size_t)i + 1));
153
if (tmp == NULL){
154
error(0, errno, "realloc");
239
155
free(new_argv);
240
156
_exit(EX_OSERR);
241
157
}
245
161
new_argv[i] = NULL;
246
162
247
163
execv(path, (char *const *)new_argv);
248
error_plus(0, errno, "execv");
164
error(0, errno, "execv");
249
165
_exit(EXIT_FAILURE);
250
166
}
251
167
if(pid_return != NULL){
257
173
and ((not interrupted_by_signal)
258
174
or (not interruptable)));
259
175
if(interrupted_by_signal and interruptable){
260
if(debug){
261
fprintf_plus(stderr, "Interrupted by signal\n");
262
}
263
176
return false;
264
177
}
265
178
if(ret == -1){
266
error_plus(0, errno, "waitpid");
179
error(0, errno, "waitpid");
267
180
return false;
268
181
}
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
182
if(WIFEXITED(status) and (WEXITSTATUS(status) == 0)){
279
183
return true;
280
184
}
281
185
return false;
282
186
}
283
187
284
__attribute__((nonnull))
285
188
int is_plymouth(const struct dirent *proc_entry){
286
189
int ret;
287
190
{
288
uintmax_t proc_id;
191
uintmax_t maxvalue;
289
192
char *tmp;
290
193
errno = 0;
291
proc_id = strtoumax(proc_entry->d_name, &tmp, 10);
194
maxvalue = strtoumax(proc_entry->d_name, &tmp, 10);
292
195
293
196
if(errno != 0 or *tmp != '\0'
294
or proc_id != (uintmax_t)((pid_t)proc_id)){
197
or maxvalue != (uintmax_t)((pid_t)maxvalue)){
295
198
return 0;
296
199
}
297
200
}
299
202
char *exe_link;
300
203
ret = asprintf(&exe_link, "/proc/%s/exe", proc_entry->d_name);
301
204
if(ret == -1){
302
error_plus(0, errno, "asprintf");
205
error(0, errno, "asprintf");
303
206
return 0;
304
207
}
305
208
308
211
if(ret == -1){
309
212
free(exe_link);
310
213
if(errno != ENOENT){
311
error_plus(0, errno, "lstat");
214
error(0, errno, "lstat");
312
215
}
313
216
return 0;
314
217
}
332
235
333
236
pid_t get_pid(void){
334
237
int ret;
335
uintmax_t proc_id = 0;
336
238
FILE *pidfile = fopen(plymouth_pid, "r");
337
/* Try the new pid file location */
239
uintmax_t maxvalue = 0;
338
240
if(pidfile != NULL){
339
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
241
ret = fscanf(pidfile, "%" SCNuMAX, &maxvalue);
340
242
if(ret != 1){
341
proc_id = 0;
243
maxvalue = 0;
342
244
}
343
245
fclose(pidfile);
344
246
}
345
/* 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;
363
}
364
fclose(pidfile);
365
}
366
}
367
/* Look for a plymouth process */
368
if(proc_id == 0){
369
struct dirent **direntries = NULL;
247
if(maxvalue == 0){
248
struct dirent **direntries;
370
249
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
371
if(ret == -1){
372
error_plus(0, errno, "scandir");
250
if (ret == -1){
251
error(0, errno, "scandir");
373
252
}
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]);
253
if (ret > 0){
254
ret = sscanf(direntries[0]->d_name, "%" SCNuMAX, &maxvalue);
255
if (ret < 0){
256
error(0, errno, "sscanf");
383
257
}
384
258
}
385
/* scandir might preallocate for this variable (man page unclear).
386
even if ret == 0, therefore we need to free it. */
387
free(direntries);
388
259
}
389
260
pid_t pid;
390
pid = (pid_t)proc_id;
391
if((uintmax_t)pid == proc_id){
261
pid = (pid_t)maxvalue;
262
if((uintmax_t)pid == maxvalue){
392
263
return pid;
393
264
}
394
265
395
266
return 0;
396
267
}
397
268
398
char **getargv(pid_t pid){
269
const char **getargv(pid_t pid){
399
270
int cl_fd;
400
271
char *cmdline_filename;
401
272
ssize_t sret;
404
275
ret = asprintf(&cmdline_filename, "/proc/%" PRIuMAX "/cmdline",
405
276
(uintmax_t)pid);
406
277
if(ret == -1){
407
error_plus(0, errno, "asprintf");
278
error(0, errno, "asprintf");
408
279
return NULL;
409
280
}
410
281
412
283
cl_fd = open(cmdline_filename, O_RDONLY);
413
284
free(cmdline_filename);
414
285
if(cl_fd == -1){
415
error_plus(0, errno, "open");
286
error(0, errno, "open");
416
287
return NULL;
417
288
}
418
289
426
297
if(cmdline_len + blocksize > cmdline_allocated){
427
298
tmp = realloc(cmdline, cmdline_allocated + blocksize);
428
299
if(tmp == NULL){
429
error_plus(0, errno, "realloc");
300
error(0, errno, "realloc");
430
301
free(cmdline);
431
302
close(cl_fd);
432
303
return NULL;
439
310
sret = read(cl_fd, cmdline + cmdline_len,
440
311
cmdline_allocated - cmdline_len);
441
312
if(sret == -1){
442
error_plus(0, errno, "read");
313
error(0, errno, "read");
443
314
free(cmdline);
444
315
close(cl_fd);
445
316
return NULL;
448
319
} while(sret != 0);
449
320
ret = close(cl_fd);
450
321
if(ret == -1){
451
error_plus(0, errno, "close");
322
error(0, errno, "close");
452
323
free(cmdline);
453
324
return NULL;
454
325
}
457
328
char **argv = malloc((argz_count(cmdline, cmdline_len) + 1)
458
329
* sizeof(char *)); /* Get number of args */
459
330
if(argv == NULL){
460
error_plus(0, errno, "argv = malloc()");
331
error(0, errno, "argv = malloc()");
461
332
free(cmdline);
462
333
return NULL;
463
334
}
464
335
argz_extract(cmdline, cmdline_len, argv); /* Create argv */
465
return argv;
336
return (const char **)argv;
466
337
}
467
338
468
339
int main(__attribute__((unused))int argc,
469
340
__attribute__((unused))char **argv){
470
char *prompt = NULL;
341
char *prompt;
471
342
char *prompt_arg;
472
343
pid_t plymouth_command_pid;
473
344
int ret;
474
345
bool bret;
475
346
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
347
/* test -x /bin/plymouth */
525
348
ret = access(plymouth_path, X_OK);
526
349
if(ret == -1){
527
350
/* Plymouth is probably not installed. Don't print an error
528
351
message, just exit. */
529
if(debug){
530
fprintf_plus(stderr, "Plymouth (%s) not found\n",
531
plymouth_path);
532
}
533
352
exit(EX_UNAVAILABLE);
534
353
}
535
354
542
361
*sig != 0; sig++){
543
362
ret = sigaddset(&new_action.sa_mask, *sig);
544
363
if(ret == -1){
545
error_plus(EX_OSERR, errno, "sigaddset");
364
error(EX_OSERR, errno, "sigaddset");
546
365
}
547
366
ret = sigaction(*sig, NULL, &old_action);
548
367
if(ret == -1){
549
error_plus(EX_OSERR, errno, "sigaction");
368
error(EX_OSERR, errno, "sigaction");
550
369
}
551
370
if(old_action.sa_handler != SIG_IGN){
552
371
ret = sigaction(*sig, &new_action, NULL);
553
372
if(ret == -1){
554
error_plus(EX_OSERR, errno, "sigaction");
373
error(EX_OSERR, errno, "sigaction");
555
374
}
556
375
}
557
376
}
569
388
}
570
389
/* Plymouth is probably not running. Don't print an error
571
390
message, just exit. */
572
if(debug){
573
fprintf_plus(stderr, "Plymouth not running\n");
574
}
575
391
exit(EX_UNAVAILABLE);
576
392
}
577
393
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
}
394
prompt = makeprompt();
395
ret = asprintf(&prompt_arg, "--prompt=%s", prompt);
396
free(prompt);
585
397
if(ret == -1){
586
error_plus(EX_OSERR, errno, "asprintf");
398
error(EX_OSERR, errno, "asprintf");
587
399
}
588
400
589
401
/* plymouth ask-for-password --prompt="$prompt" */
590
if(debug){
591
fprintf_plus(stderr, "Prompting for password via Plymouth\n");
592
}
593
402
bret = exec_and_wait(&plymouth_command_pid,
594
403
plymouth_path, (const char *[])
595
404
{ plymouth_path, "ask-for-password",
605
414
}
606
415
kill_and_wait(plymouth_command_pid);
607
416
608
char **plymouthd_argv = NULL;
417
const char **plymouthd_argv;
609
418
pid_t pid = get_pid();
610
419
if(pid == 0){
611
error_plus(0, 0, "plymouthd pid not found");
420
error(0, 0, "plymouthd pid not found");
421
plymouthd_argv = plymouthd_default_argv;
612
422
} else {
613
423
plymouthd_argv = getargv(pid);
614
424
}
617
427
{ plymouth_path, "quit", NULL },
618
428
false, false);
619
429
if(not bret){
620
if(plymouthd_argv != NULL){
621
free(*plymouthd_argv);
622
free(plymouthd_argv);
623
}
624
430
exit(EXIT_FAILURE);
625
431
}
626
bret = exec_and_wait(NULL, plymouthd_path,
627
(plymouthd_argv != NULL)
628
? (const char * const *)plymouthd_argv
629
: plymouthd_default_argv,
432
bret = exec_and_wait(NULL, plymouthd_path, plymouthd_argv,
630
433
false, true);
631
if(plymouthd_argv != NULL){
632
free(*plymouthd_argv);
633
free(plymouthd_argv);
634
}
635
434
if(not bret){
636
435
exit(EXIT_FAILURE);
637
436
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0