3
3
* Plymouth - Read a password from Plymouth and output it
5
* Copyright © 2010-2011 Teddy Hogeborn
6
* Copyright © 2010-2011 Björn Påhlsson
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.
13
* This program is distributed in the hope that it will be useful, but
5
* Copyright © 2010-2020 Teddy Hogeborn
6
* Copyright © 2010-2020 Björn Påhlsson
8
* This file is part of Mandos.
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.
15
* Mandos is distributed in the hope that it will be useful, but
14
16
* WITHOUT ANY WARRANTY; without even the implied warranty of
15
17
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16
18
* General Public License for more details.
18
20
* You should have received a copy of the GNU General Public License
19
* along with this program. If not, see
20
* <http://www.gnu.org/licenses/>.
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
22
23
* Contact the authors at <mandos@recompile.se>.
43
44
STDERR_FILENO, execv(), access() */
44
45
#include <stdlib.h> /* free(), EXIT_FAILURE, realloc(),
45
46
EXIT_SUCCESS, malloc(), _exit(),
47
getenv(), reallocarray() */
47
48
#include <dirent.h> /* scandir(), alphasort() */
48
49
#include <inttypes.h> /* intmax_t, strtoumax(), SCNuMAX */
49
50
#include <sys/stat.h> /* struct stat, lstat() */
52
53
#include <errno.h> /* TEMP_FAILURE_RETRY */
53
54
#include <argz.h> /* argz_count(), argz_extract() */
54
55
#include <stdarg.h> /* va_list, va_start(), ... */
56
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>";
58
62
/* Used by Ubuntu 11.04 (Natty Narwahl) */
59
const char plymouth_old_pid[] = "/dev/.initramfs/plymouth.pid";
63
const char plymouth_old_old_pid[] = "/dev/.initramfs/plymouth.pid";
60
64
/* Used by Ubuntu 11.10 (Oneiric Ocelot) */
61
const char plymouth_pid[] = "/run/initramfs/plymouth.pid";
65
const char plymouth_old_pid[] = "/run/initramfs/plymouth.pid";
66
/* Used by Debian 9 (stretch) */
67
const char plymouth_pid[] = "/run/plymouth/pid";
63
69
const char plymouth_path[] = "/bin/plymouth";
64
70
const char plymouthd_path[] = "/sbin/plymouthd";
74
81
interrupted_by_signal = 1;
84
__attribute__((format (gnu_printf, 2, 3), nonnull))
85
int fprintf_plus(FILE *stream, const char *format, ...){
87
va_start (ap, format);
88
fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name);
89
return vfprintf(stream, format, ap);
77
92
/* Function to use when printing errors */
78
93
__attribute__((format (gnu_printf, 3, 4)))
79
94
void error_plus(int status, int errnum, const char *formatstring,
85
100
va_start(ap, formatstring);
86
101
ret = vasprintf(&text, formatstring, ap);
88
103
fprintf(stderr, "Mandos plugin %s: ",
89
104
program_invocation_short_name);
90
105
vfprintf(stderr, formatstring, ap);
157
172
__attribute__((nonnull (2, 3)))
158
173
bool exec_and_wait(pid_t *pid_return, const char *path,
159
const char **argv, bool interruptable,
174
const char * const * const argv, bool interruptable,
180
for(const char * const *arg = argv; *arg != NULL; arg++){
181
fprintf_plus(stderr, "exec_and_wait arg: %s\n", *arg);
183
fprintf_plus(stderr, "exec_and_wait end of args\n");
166
188
error_plus(0, errno, "fork");
177
char **new_argv = NULL;
199
char **new_argv = malloc(sizeof(const char *));
200
if(new_argv == NULL){
201
error_plus(0, errno, "malloc");
180
for (; argv[i]!=NULL; i++){
181
tmp = realloc(new_argv, sizeof(const char *) * ((size_t)i + 1));
183
error_plus(0, errno, "realloc");
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 *));
211
if(((size_t)i + 2) > (SIZE_MAX / sizeof(const char *))){
216
tmp = realloc(new_argv, ((size_t)i + 2) * sizeof(const char *));
220
error_plus(0, errno, "reallocarray");
202
239
and ((not interrupted_by_signal)
203
240
or (not interruptable)));
204
241
if(interrupted_by_signal and interruptable){
243
fprintf_plus(stderr, "Interrupted by signal\n");
208
248
error_plus(0, errno, "waitpid");
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",
211
260
if(WIFEXITED(status) and (WEXITSTATUS(status) == 0)){
218
267
int is_plymouth(const struct dirent *proc_entry){
224
maxvalue = strtoumax(proc_entry->d_name, &tmp, 10);
273
proc_id = strtoumax(proc_entry->d_name, &tmp, 10);
226
275
if(errno != 0 or *tmp != '\0'
227
or maxvalue != (uintmax_t)((pid_t)maxvalue)){
276
or proc_id != (uintmax_t)((pid_t)proc_id)){
266
315
pid_t get_pid(void){
268
uintmax_t maxvalue = 0;
317
uintmax_t proc_id = 0;
269
318
FILE *pidfile = fopen(plymouth_pid, "r");
270
319
/* Try the new pid file location */
271
320
if(pidfile != NULL){
272
ret = fscanf(pidfile, "%" SCNuMAX, &maxvalue);
321
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
278
327
/* Try the old pid file location */
280
pidfile = fopen(plymouth_pid, "r");
282
ret = fscanf(pidfile, "%" SCNuMAX, &maxvalue);
329
pidfile = fopen(plymouth_old_pid, "r");
331
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
338
/* Try the old old pid file location */
340
pidfile = fopen(plymouth_old_old_pid, "r");
342
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
289
349
/* Look for a plymouth process */
291
351
struct dirent **direntries = NULL;
292
352
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
294
354
error_plus(0, errno, "scandir");
297
ret = sscanf(direntries[0]->d_name, "%" SCNuMAX, &maxvalue);
299
error_plus(0, errno, "sscanf");
357
for(int i = ret-1; i >= 0; i--){
359
ret = sscanf(direntries[i]->d_name, "%" SCNuMAX, &proc_id);
361
error_plus(0, errno, "sscanf");
302
367
/* scandir might preallocate for this variable (man page unclear).
381
446
argz_extract(cmdline, cmdline_len, argv); /* Create argv */
382
return (const char **)argv;
385
450
int main(__attribute__((unused))int argc,
386
451
__attribute__((unused))char **argv){
388
453
char *prompt_arg;
389
454
pid_t plymouth_command_pid;
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" },
467
__attribute__((nonnull(3)))
468
error_t parse_opt (int key, char *arg, __attribute__((unused))
469
struct argp_state *state){
472
case 128: /* --prompt */
475
fprintf_plus(stderr, "Custom prompt \"%s\"\n", prompt);
478
case 129: /* --debug */
482
return ARGP_ERR_UNKNOWN;
487
struct argp argp = { .options = options, .parser = parse_opt,
489
.doc = "Mandos plymouth -- Read and"
490
" output a password" };
491
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, NULL, NULL);
498
error_plus(0, errno, "argp_parse");
501
error_plus(0, errno, "argp_parse");
393
506
/* test -x /bin/plymouth */
394
507
ret = access(plymouth_path, X_OK);
396
509
/* Plymouth is probably not installed. Don't print an error
397
510
message, just exit. */
512
fprintf_plus(stderr, "Plymouth (%s) not found\n",
398
515
exit(EX_UNAVAILABLE);
435
552
/* Plymouth is probably not running. Don't print an error
436
553
message, just exit. */
555
fprintf_plus(stderr, "Plymouth not running\n");
437
557
exit(EX_UNAVAILABLE);
440
prompt = makeprompt();
441
ret = asprintf(&prompt_arg, "--prompt=%s", prompt);
561
ret = asprintf(&prompt_arg, "--prompt=%s", prompt);
563
char *made_prompt = makeprompt();
564
ret = asprintf(&prompt_arg, "--prompt=%s", made_prompt);
444
568
error_plus(EX_OSERR, errno, "asprintf");
447
571
/* plymouth ask-for-password --prompt="$prompt" */
573
fprintf_plus(stderr, "Prompting for password via Plymouth\n");
448
575
bret = exec_and_wait(&plymouth_command_pid,
449
576
plymouth_path, (const char *[])
450
577
{ plymouth_path, "ask-for-password",
461
588
kill_and_wait(plymouth_command_pid);
463
const char **plymouthd_argv;
590
char **plymouthd_argv = NULL;
464
591
pid_t pid = get_pid();
466
593
error_plus(0, 0, "plymouthd pid not found");
467
plymouthd_argv = plymouthd_default_argv;
469
595
plymouthd_argv = getargv(pid);
473
599
{ plymouth_path, "quit", NULL },
602
if(plymouthd_argv != NULL){
603
free(*plymouthd_argv);
604
free(plymouthd_argv);
476
606
exit(EXIT_FAILURE);
478
bret = exec_and_wait(NULL, plymouthd_path, plymouthd_argv,
608
bret = exec_and_wait(NULL, plymouthd_path,
609
(plymouthd_argv != NULL)
610
? (const char * const *)plymouthd_argv
611
: plymouthd_default_argv,
613
if(plymouthd_argv != NULL){
614
free(*plymouthd_argv);
615
free(plymouthd_argv);
481
618
exit(EXIT_FAILURE);
added
removed
plugins.d/plymouth.c
