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 82
- compare with another revision
- download diff
- download tarball
- view history from revision 82
- Committer: Teddy Hogeborn
- Date: 2008-08-17 06:17:10 UTC
- Revision ID: teddy@fukt.bsnet.se-20080817061710-epkw87paysoo9g7w
* mandos-keygen.xml (NOTES): Removed section, since it is
automatically created for footnotes.
automatically created for footnotes.
- files added:
- initramfs-tools-hook-conf
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
plugins.d/plymouth.c
1
/* -*- coding: utf-8 -*- */
2
/*
3
* Plymouth - Read a password from Plymouth and output it
4
*
5
* Copyright © 2010-2020 Teddy Hogeborn
6
* Copyright © 2010-2020 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
#define _GNU_SOURCE /* asprintf(), TEMP_FAILURE_RETRY() */
27
#include <signal.h> /* sig_atomic_t, struct sigaction,
28
sigemptyset(), sigaddset(), SIGINT,
29
SIGHUP, SIGTERM, sigaction(),
30
kill(), SIG_IGN */
31
#include <stdbool.h> /* bool, false, true */
32
#include <fcntl.h> /* open(), O_RDONLY */
33
#include <iso646.h> /* and, or, not*/
34
#include <sys/types.h> /* size_t, ssize_t, pid_t, struct
35
dirent, waitpid() */
36
#include <sys/wait.h> /* waitpid() */
37
#include <stddef.h> /* NULL */
38
#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(),
44
STDERR_FILENO, execv(), access() */
45
#include <stdlib.h> /* free(), EXIT_FAILURE, realloc(),
46
EXIT_SUCCESS, malloc(), _exit(),
47
getenv(), reallocarray() */
48
#include <dirent.h> /* scandir(), alphasort() */
49
#include <inttypes.h> /* intmax_t, strtoumax(), SCNuMAX */
50
#include <sys/stat.h> /* struct stat, lstat() */
51
#include <sysexits.h> /* EX_OSERR, EX_UNAVAILABLE */
52
#include <error.h> /* error() */
53
#include <errno.h> /* TEMP_FAILURE_RETRY */
54
#include <argz.h> /* argz_count(), argz_extract() */
55
#include <stdarg.h> /* va_list, va_start(), ... */
56
#include <argp.h>
57
58
sig_atomic_t interrupted_by_signal = 0;
59
const char *argp_program_version = "plymouth " VERSION;
60
const char *argp_program_bug_address = "<mandos@recompile.se>";
61
62
/* Used by Ubuntu 11.04 (Natty Narwahl) */
63
const char plymouth_old_old_pid[] = "/dev/.initramfs/plymouth.pid";
64
/* Used by Ubuntu 11.10 (Oneiric Ocelot) */
65
const char plymouth_old_pid[] = "/run/initramfs/plymouth.pid";
66
/* Used by Debian 9 (stretch) */
67
const char plymouth_pid[] = "/run/plymouth/pid";
68
69
const char plymouth_path[] = "/bin/plymouth";
70
const char plymouthd_path[] = "/sbin/plymouthd";
71
const char *plymouthd_default_argv[] = {"/sbin/plymouthd",
72
"--mode=boot",
73
"--attach-to-session",
74
NULL };
75
bool debug = false;
76
77
static void termination_handler(__attribute__((unused))int signum){
78
if(interrupted_by_signal){
79
return;
80
}
81
interrupted_by_signal = 1;
82
}
83
84
__attribute__((format (gnu_printf, 2, 3), nonnull))
85
int fprintf_plus(FILE *stream, const char *format, ...){
86
va_list ap;
87
va_start (ap, format);
88
fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name);
89
return vfprintf(stream, format, ap);
90
}
91
92
/* Function to use when printing errors */
93
__attribute__((format (gnu_printf, 3, 4)))
94
void error_plus(int status, int errnum, const char *formatstring,
95
...){
96
va_list ap;
97
char *text;
98
int ret;
99
100
va_start(ap, formatstring);
101
ret = vasprintf(&text, formatstring, ap);
102
if(ret == -1){
103
fprintf(stderr, "Mandos plugin %s: ",
104
program_invocation_short_name);
105
vfprintf(stderr, formatstring, ap);
106
fprintf(stderr, ": ");
107
fprintf(stderr, "%s\n", strerror(errnum));
108
error(status, errno, "vasprintf while printing error");
109
return;
110
}
111
fprintf(stderr, "Mandos plugin ");
112
error(status, errnum, "%s", text);
113
free(text);
114
}
115
116
/* Create prompt string */
117
char *makeprompt(void){
118
int ret = 0;
119
char *prompt;
120
const char *const cryptsource = getenv("cryptsource");
121
const char *const crypttarget = getenv("crypttarget");
122
const char prompt_start[] = "Unlocking the disk";
123
const char prompt_end[] = "Enter passphrase";
124
125
if(cryptsource == NULL){
126
if(crypttarget == NULL){
127
ret = asprintf(&prompt, "%s\n%s", prompt_start, prompt_end);
128
} else {
129
ret = asprintf(&prompt, "%s (%s)\n%s", prompt_start,
130
crypttarget, prompt_end);
131
}
132
} else {
133
if(crypttarget == NULL){
134
ret = asprintf(&prompt, "%s %s\n%s", prompt_start, cryptsource,
135
prompt_end);
136
} else {
137
ret = asprintf(&prompt, "%s %s (%s)\n%s", prompt_start,
138
cryptsource, crypttarget, prompt_end);
139
}
140
}
141
if(ret == -1){
142
return NULL;
143
}
144
return prompt;
145
}
146
147
void kill_and_wait(pid_t pid){
148
TEMP_FAILURE_RETRY(kill(pid, SIGTERM));
149
TEMP_FAILURE_RETRY(waitpid(pid, NULL, 0));
150
}
151
152
bool become_a_daemon(void){
153
int ret = setuid(geteuid());
154
if(ret == -1){
155
error_plus(0, errno, "setuid");
156
}
157
158
setsid();
159
ret = chdir("/");
160
if(ret == -1){
161
error_plus(0, errno, "chdir");
162
return false;
163
}
164
ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
165
if(ret == -1){
166
error_plus(0, errno, "dup2");
167
return false;
168
}
169
return true;
170
}
171
172
__attribute__((nonnull (2, 3)))
173
bool exec_and_wait(pid_t *pid_return, const char *path,
174
const char * const * const argv, bool interruptable,
175
bool daemonize){
176
int status;
177
int ret;
178
pid_t pid;
179
if(debug){
180
for(const char * const *arg = argv; *arg != NULL; arg++){
181
fprintf_plus(stderr, "exec_and_wait arg: %s\n", *arg);
182
}
183
fprintf_plus(stderr, "exec_and_wait end of args\n");
184
}
185
186
pid = fork();
187
if(pid == -1){
188
error_plus(0, errno, "fork");
189
return false;
190
}
191
if(pid == 0){
192
/* Child */
193
if(daemonize){
194
if(not become_a_daemon()){
195
_exit(EX_OSERR);
196
}
197
}
198
199
char **new_argv = malloc(sizeof(const char *));
200
if(new_argv == NULL){
201
error_plus(0, errno, "malloc");
202
_exit(EX_OSERR);
203
}
204
char **tmp;
205
int i = 0;
206
for (; argv[i] != NULL; i++){
207
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
208
tmp = reallocarray(new_argv, ((size_t)i + 2),
209
sizeof(const char *));
210
#else
211
if(((size_t)i + 2) > (SIZE_MAX / sizeof(const char *))){
212
/* overflow */
213
tmp = NULL;
214
errno = ENOMEM;
215
} else {
216
tmp = realloc(new_argv, ((size_t)i + 2) * sizeof(const char *));
217
}
218
#endif
219
if(tmp == NULL){
220
error_plus(0, errno, "reallocarray");
221
free(new_argv);
222
_exit(EX_OSERR);
223
}
224
new_argv = tmp;
225
new_argv[i] = strdup(argv[i]);
226
}
227
new_argv[i] = NULL;
228
229
execv(path, (char *const *)new_argv);
230
error_plus(0, errno, "execv");
231
_exit(EXIT_FAILURE);
232
}
233
if(pid_return != NULL){
234
*pid_return = pid;
235
}
236
do {
237
ret = waitpid(pid, &status, 0);
238
} while(ret == -1 and errno == EINTR
239
and ((not interrupted_by_signal)
240
or (not interruptable)));
241
if(interrupted_by_signal and interruptable){
242
if(debug){
243
fprintf_plus(stderr, "Interrupted by signal\n");
244
}
245
return false;
246
}
247
if(ret == -1){
248
error_plus(0, errno, "waitpid");
249
return false;
250
}
251
if(debug){
252
if(WIFEXITED(status)){
253
fprintf_plus(stderr, "exec_and_wait exited: %d\n",
254
WEXITSTATUS(status));
255
} else if(WIFSIGNALED(status)) {
256
fprintf_plus(stderr, "exec_and_wait signaled: %d\n",
257
WTERMSIG(status));
258
}
259
}
260
if(WIFEXITED(status) and (WEXITSTATUS(status) == 0)){
261
return true;
262
}
263
return false;
264
}
265
266
__attribute__((nonnull))
267
int is_plymouth(const struct dirent *proc_entry){
268
int ret;
269
{
270
uintmax_t proc_id;
271
char *tmp;
272
errno = 0;
273
proc_id = strtoumax(proc_entry->d_name, &tmp, 10);
274
275
if(errno != 0 or *tmp != '\0'
276
or proc_id != (uintmax_t)((pid_t)proc_id)){
277
return 0;
278
}
279
}
280
char exe_target[sizeof(plymouthd_path)];
281
char *exe_link;
282
ret = asprintf(&exe_link, "/proc/%s/exe", proc_entry->d_name);
283
if(ret == -1){
284
error_plus(0, errno, "asprintf");
285
return 0;
286
}
287
288
struct stat exe_stat;
289
ret = lstat(exe_link, &exe_stat);
290
if(ret == -1){
291
free(exe_link);
292
if(errno != ENOENT){
293
error_plus(0, errno, "lstat");
294
}
295
return 0;
296
}
297
298
if(not S_ISLNK(exe_stat.st_mode)
299
or exe_stat.st_uid != 0
300
or exe_stat.st_gid != 0){
301
free(exe_link);
302
return 0;
303
}
304
305
ssize_t sret = readlink(exe_link, exe_target, sizeof(exe_target));
306
free(exe_link);
307
if((sret != (ssize_t)sizeof(plymouthd_path)-1) or
308
(memcmp(plymouthd_path, exe_target,
309
sizeof(plymouthd_path)-1) != 0)){
310
return 0;
311
}
312
return 1;
313
}
314
315
pid_t get_pid(void){
316
int ret;
317
uintmax_t proc_id = 0;
318
FILE *pidfile = fopen(plymouth_pid, "r");
319
/* Try the new pid file location */
320
if(pidfile != NULL){
321
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
322
if(ret != 1){
323
proc_id = 0;
324
}
325
fclose(pidfile);
326
}
327
/* Try the old pid file location */
328
if(proc_id == 0){
329
pidfile = fopen(plymouth_old_pid, "r");
330
if(pidfile != NULL){
331
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
332
if(ret != 1){
333
proc_id = 0;
334
}
335
fclose(pidfile);
336
}
337
}
338
/* Try the old old pid file location */
339
if(proc_id == 0){
340
pidfile = fopen(plymouth_old_old_pid, "r");
341
if(pidfile != NULL){
342
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
343
if(ret != 1){
344
proc_id = 0;
345
}
346
fclose(pidfile);
347
}
348
}
349
/* Look for a plymouth process */
350
if(proc_id == 0){
351
struct dirent **direntries = NULL;
352
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
353
if(ret == -1){
354
error_plus(0, errno, "scandir");
355
}
356
if(ret > 0){
357
for(int i = ret-1; i >= 0; i--){
358
if(proc_id == 0){
359
ret = sscanf(direntries[i]->d_name, "%" SCNuMAX, &proc_id);
360
if(ret < 0){
361
error_plus(0, errno, "sscanf");
362
}
363
}
364
free(direntries[i]);
365
}
366
}
367
/* scandir might preallocate for this variable (man page unclear).
368
even if ret == 0, therefore we need to free it. */
369
free(direntries);
370
}
371
pid_t pid;
372
pid = (pid_t)proc_id;
373
if((uintmax_t)pid == proc_id){
374
return pid;
375
}
376
377
return 0;
378
}
379
380
char **getargv(pid_t pid){
381
int cl_fd;
382
char *cmdline_filename;
383
ssize_t sret;
384
int ret;
385
386
ret = asprintf(&cmdline_filename, "/proc/%" PRIuMAX "/cmdline",
387
(uintmax_t)pid);
388
if(ret == -1){
389
error_plus(0, errno, "asprintf");
390
return NULL;
391
}
392
393
/* Open /proc/<pid>/cmdline */
394
cl_fd = open(cmdline_filename, O_RDONLY);
395
free(cmdline_filename);
396
if(cl_fd == -1){
397
error_plus(0, errno, "open");
398
return NULL;
399
}
400
401
size_t cmdline_allocated = 0;
402
size_t cmdline_len = 0;
403
char *cmdline = NULL;
404
char *tmp;
405
const size_t blocksize = 1024;
406
do {
407
/* Allocate more space? */
408
if(cmdline_len + blocksize > cmdline_allocated){
409
tmp = realloc(cmdline, cmdline_allocated + blocksize);
410
if(tmp == NULL){
411
error_plus(0, errno, "realloc");
412
free(cmdline);
413
close(cl_fd);
414
return NULL;
415
}
416
cmdline = tmp;
417
cmdline_allocated += blocksize;
418
}
419
420
/* Read data */
421
sret = read(cl_fd, cmdline + cmdline_len,
422
cmdline_allocated - cmdline_len);
423
if(sret == -1){
424
error_plus(0, errno, "read");
425
free(cmdline);
426
close(cl_fd);
427
return NULL;
428
}
429
cmdline_len += (size_t)sret;
430
} while(sret != 0);
431
ret = close(cl_fd);
432
if(ret == -1){
433
error_plus(0, errno, "close");
434
free(cmdline);
435
return NULL;
436
}
437
438
/* we got cmdline and cmdline_len, ignore rest... */
439
char **argv = malloc((argz_count(cmdline, cmdline_len) + 1)
440
* sizeof(char *)); /* Get number of args */
441
if(argv == NULL){
442
error_plus(0, errno, "argv = malloc()");
443
free(cmdline);
444
return NULL;
445
}
446
argz_extract(cmdline, cmdline_len, argv); /* Create argv */
447
return argv;
448
}
449
450
int main(__attribute__((unused))int argc,
451
__attribute__((unused))char **argv){
452
char *prompt = NULL;
453
char *prompt_arg;
454
pid_t plymouth_command_pid;
455
int ret;
456
bool bret;
457
458
{
459
struct argp_option options[] = {
460
{ .name = "prompt", .key = 128, .arg = "PROMPT",
461
.doc = "The prompt to show" },
462
{ .name = "debug", .key = 129,
463
.doc = "Debug mode" },
464
{ .name = NULL }
465
};
466
467
__attribute__((nonnull(3)))
468
error_t parse_opt (int key, char *arg, __attribute__((unused))
469
struct argp_state *state){
470
errno = 0;
471
switch (key){
472
case 128: /* --prompt */
473
prompt = arg;
474
if(debug){
475
fprintf_plus(stderr, "Custom prompt \"%s\"\n", prompt);
476
}
477
break;
478
case 129: /* --debug */
479
debug = true;
480
break;
481
default:
482
return ARGP_ERR_UNKNOWN;
483
}
484
return errno;
485
}
486
487
struct argp argp = { .options = options, .parser = parse_opt,
488
.args_doc = "",
489
.doc = "Mandos plymouth -- Read and"
490
" output a password" };
491
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, NULL, NULL);
492
switch(ret){
493
case 0:
494
break;
495
case ENOMEM:
496
default:
497
errno = ret;
498
error_plus(0, errno, "argp_parse");
499
return EX_OSERR;
500
case EINVAL:
501
error_plus(0, errno, "argp_parse");
502
return EX_USAGE;
503
}
504
}
505
506
/* test -x /bin/plymouth */
507
ret = access(plymouth_path, X_OK);
508
if(ret == -1){
509
/* Plymouth is probably not installed. Don't print an error
510
message, just exit. */
511
if(debug){
512
fprintf_plus(stderr, "Plymouth (%s) not found\n",
513
plymouth_path);
514
}
515
exit(EX_UNAVAILABLE);
516
}
517
518
{ /* Add signal handlers */
519
struct sigaction old_action,
520
new_action = { .sa_handler = termination_handler,
521
.sa_flags = 0 };
522
sigemptyset(&new_action.sa_mask);
523
for(int *sig = (int[]){ SIGINT, SIGHUP, SIGTERM, 0 };
524
*sig != 0; sig++){
525
ret = sigaddset(&new_action.sa_mask, *sig);
526
if(ret == -1){
527
error_plus(EX_OSERR, errno, "sigaddset");
528
}
529
ret = sigaction(*sig, NULL, &old_action);
530
if(ret == -1){
531
error_plus(EX_OSERR, errno, "sigaction");
532
}
533
if(old_action.sa_handler != SIG_IGN){
534
ret = sigaction(*sig, &new_action, NULL);
535
if(ret == -1){
536
error_plus(EX_OSERR, errno, "sigaction");
537
}
538
}
539
}
540
}
541
542
/* plymouth --ping */
543
bret = exec_and_wait(&plymouth_command_pid, plymouth_path,
544
(const char *[])
545
{ plymouth_path, "--ping", NULL },
546
true, false);
547
if(not bret){
548
if(interrupted_by_signal){
549
kill_and_wait(plymouth_command_pid);
550
exit(EXIT_FAILURE);
551
}
552
/* Plymouth is probably not running. Don't print an error
553
message, just exit. */
554
if(debug){
555
fprintf_plus(stderr, "Plymouth not running\n");
556
}
557
exit(EX_UNAVAILABLE);
558
}
559
560
if(prompt != NULL){
561
ret = asprintf(&prompt_arg, "--prompt=%s", prompt);
562
} else {
563
char *made_prompt = makeprompt();
564
ret = asprintf(&prompt_arg, "--prompt=%s", made_prompt);
565
free(made_prompt);
566
}
567
if(ret == -1){
568
error_plus(EX_OSERR, errno, "asprintf");
569
}
570
571
/* plymouth ask-for-password --prompt="$prompt" */
572
if(debug){
573
fprintf_plus(stderr, "Prompting for password via Plymouth\n");
574
}
575
bret = exec_and_wait(&plymouth_command_pid,
576
plymouth_path, (const char *[])
577
{ plymouth_path, "ask-for-password",
578
prompt_arg, NULL },
579
true, false);
580
free(prompt_arg);
581
if(bret){
582
exit(EXIT_SUCCESS);
583
}
584
if(not interrupted_by_signal){
585
/* exec_and_wait failed for some other reason */
586
exit(EXIT_FAILURE);
587
}
588
kill_and_wait(plymouth_command_pid);
589
590
char **plymouthd_argv = NULL;
591
pid_t pid = get_pid();
592
if(pid == 0){
593
error_plus(0, 0, "plymouthd pid not found");
594
} else {
595
plymouthd_argv = getargv(pid);
596
}
597
598
bret = exec_and_wait(NULL, plymouth_path, (const char *[])
599
{ plymouth_path, "quit", NULL },
600
false, false);
601
if(not bret){
602
if(plymouthd_argv != NULL){
603
free(*plymouthd_argv);
604
free(plymouthd_argv);
605
}
606
exit(EXIT_FAILURE);
607
}
608
bret = exec_and_wait(NULL, plymouthd_path,
609
(plymouthd_argv != NULL)
610
? (const char * const *)plymouthd_argv
611
: plymouthd_default_argv,
612
false, true);
613
if(plymouthd_argv != NULL){
614
free(*plymouthd_argv);
615
free(plymouthd_argv);
616
}
617
if(not bret){
618
exit(EXIT_FAILURE);
619
}
620
exec_and_wait(NULL, plymouth_path, (const char *[])
621
{ plymouth_path, "show-splash", NULL },
622
false, false);
623
exit(EXIT_FAILURE);
624
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0