1
/* -*- coding: utf-8 -*- */
3
* Plymouth - Read a password from Plymouth and output it
5
* Copyright © 2010-2019 Teddy Hogeborn
6
* Copyright © 2010-2019 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
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.
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/>.
23
* Contact the authors at <mandos@recompile.se>.
26
1
#define _GNU_SOURCE /* asprintf(), TEMP_FAILURE_RETRY() */
27
2
#include <signal.h> /* sig_atomic_t, struct sigaction,
28
3
sigemptyset(), sigaddset(), SIGINT,
37
12
#include <stddef.h> /* NULL */
38
13
#include <string.h> /* strchr(), memcmp() */
39
14
#include <stdio.h> /* asprintf(), perror(), fopen(),
40
fscanf(), vasprintf(), fprintf(),
42
16
#include <unistd.h> /* close(), readlink(), read(),
43
17
fork(), setsid(), chdir(), dup2(),
44
18
STDERR_FILENO, execv(), access() */
52
26
#include <error.h> /* error() */
53
27
#include <errno.h> /* TEMP_FAILURE_RETRY */
54
28
#include <argz.h> /* argz_count(), argz_extract() */
55
#include <stdarg.h> /* va_list, va_start(), ... */
58
30
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>";
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";
31
const char plymouth_pid[] = "/dev/.initramfs/plymouth.pid";
69
32
const char plymouth_path[] = "/bin/plymouth";
70
33
const char plymouthd_path[] = "/sbin/plymouthd";
71
34
const char *plymouthd_default_argv[] = {"/sbin/plymouthd",
73
36
"--attach-to-session",
77
42
static void termination_handler(__attribute__((unused))int signum){
78
43
if(interrupted_by_signal){
81
46
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);
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,
100
va_start(ap, formatstring);
101
ret = vasprintf(&text, formatstring, ap);
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");
111
fprintf(stderr, "Mandos plugin ");
112
error(status, errnum, "%s", text);
116
49
/* Create prompt string */
117
50
char *makeprompt(void){
120
53
const char *const cryptsource = getenv("cryptsource");
121
54
const char *const crypttarget = getenv("crypttarget");
122
const char prompt_start[] = "Unlocking the disk";
123
const char prompt_end[] = "Enter passphrase";
55
const char prompt_start[] = "Enter passphrase to unlock the disk";
125
57
if(cryptsource == NULL){
126
58
if(crypttarget == NULL){
127
ret = asprintf(&prompt, "%s\n%s", prompt_start, prompt_end);
59
ret = asprintf(&prompt, "%s: ", prompt_start);
129
ret = asprintf(&prompt, "%s (%s)\n%s", prompt_start,
130
crypttarget, prompt_end);
61
ret = asprintf(&prompt, "%s (%s): ", prompt_start,
133
65
if(crypttarget == NULL){
134
ret = asprintf(&prompt, "%s %s\n%s", prompt_start, cryptsource,
66
ret = asprintf(&prompt, "%s %s: ", prompt_start, cryptsource);
137
ret = asprintf(&prompt, "%s %s (%s)\n%s", prompt_start,
138
cryptsource, crypttarget, prompt_end);
68
ret = asprintf(&prompt, "%s %s (%s): ", prompt_start,
69
cryptsource, crypttarget);
152
83
bool become_a_daemon(void){
153
84
int ret = setuid(geteuid());
155
error_plus(0, errno, "setuid");
86
error(0, errno, "setuid");
161
error_plus(0, errno, "chdir");
92
error(0, errno, "chdir");
164
95
ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
166
error_plus(0, errno, "dup2");
97
error(0, errno, "dup2");
172
__attribute__((nonnull (2, 3)))
173
103
bool exec_and_wait(pid_t *pid_return, const char *path,
174
const char * const * const argv, bool interruptable,
104
const char **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");
188
error_plus(0, errno, "fork");
111
error(0, errno, "fork");
199
char **new_argv = malloc(sizeof(const char *));
200
if(new_argv == NULL){
201
error_plus(0, errno, "malloc");
122
char **new_argv = NULL;
206
for (; argv[i] != NULL; i++){
207
tmp = realloc(new_argv, sizeof(const char *) * ((size_t)i + 2));
209
error_plus(0, errno, "realloc");
125
for (; argv[i]!=(char *)NULL; i++){
126
tmp = realloc(new_argv, sizeof(const char *) * ((size_t)i + 1));
128
error(0, errno, "realloc");
132
new_argv = (char **)tmp;
214
133
new_argv[i] = strdup(argv[i]);
135
new_argv[i] = (char *) NULL;
218
137
execv(path, (char *const *)new_argv);
219
error_plus(0, errno, "execv");
138
error(0, errno, "execv");
220
139
_exit(EXIT_FAILURE);
222
141
if(pid_return != NULL){
228
147
and ((not interrupted_by_signal)
229
148
or (not interruptable)));
230
149
if(interrupted_by_signal and interruptable){
232
fprintf_plus(stderr, "Interrupted by signal\n");
237
error_plus(0, errno, "waitpid");
153
error(0, errno, "waitpid");
241
if(WIFEXITED(status)){
242
fprintf_plus(stderr, "exec_and_wait exited: %d\n",
243
WEXITSTATUS(status));
244
} else if(WIFSIGNALED(status)) {
245
fprintf_plus(stderr, "exec_and_wait signaled: %d\n",
249
156
if(WIFEXITED(status) and (WEXITSTATUS(status) == 0)){
255
__attribute__((nonnull))
256
162
int is_plymouth(const struct dirent *proc_entry){
262
proc_id = strtoumax(proc_entry->d_name, &tmp, 10);
168
maxvalue = strtoumax(proc_entry->d_name, &tmp, 10);
264
170
if(errno != 0 or *tmp != '\0'
265
or proc_id != (uintmax_t)((pid_t)proc_id)){
171
or maxvalue != (uintmax_t)((pid_t)maxvalue)){
269
char exe_target[sizeof(plymouthd_path)];
175
char exe_target[sizeof(plymouth_path)];
271
177
ret = asprintf(&exe_link, "/proc/%s/exe", proc_entry->d_name);
273
error_plus(0, errno, "asprintf");
179
error(0, errno, "asprintf");
294
200
ssize_t sret = readlink(exe_link, exe_target, sizeof(exe_target));
296
if((sret != (ssize_t)sizeof(plymouthd_path)-1) or
297
(memcmp(plymouthd_path, exe_target,
298
sizeof(plymouthd_path)-1) != 0)){
202
if((sret != (ssize_t)sizeof(plymouth_path)-1) or
203
(memcmp(plymouth_path, exe_target,
204
sizeof(plymouth_path)-1) != 0)){
304
210
pid_t get_pid(void){
306
uintmax_t proc_id = 0;
307
212
FILE *pidfile = fopen(plymouth_pid, "r");
308
/* Try the new pid file location */
213
uintmax_t maxvalue = 0;
309
214
if(pidfile != NULL){
310
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
215
ret = fscanf(pidfile, "%" SCNuMAX, &maxvalue);
316
/* Try the old pid file location */
318
pidfile = fopen(plymouth_old_pid, "r");
320
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
327
/* Try the old old pid file location */
329
pidfile = fopen(plymouth_old_old_pid, "r");
331
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
338
/* Look for a plymouth process */
340
struct dirent **direntries = NULL;
222
struct dirent **direntries;
341
223
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
343
error_plus(0, errno, "scandir");
346
for(int i = ret-1; i >= 0; i--){
348
ret = sscanf(direntries[i]->d_name, "%" SCNuMAX, &proc_id);
350
error_plus(0, errno, "sscanf");
356
/* scandir might preallocate for this variable (man page unclear).
357
even if ret == 0, therefore we need to free it. */
224
sscanf(direntries[0]->d_name, "%" SCNuMAX, &maxvalue);
361
pid = (pid_t)proc_id;
362
if((uintmax_t)pid == proc_id){
227
pid = (pid_t)maxvalue;
228
if((uintmax_t)pid == maxvalue){
369
char **getargv(pid_t pid){
235
const char **getargv(pid_t pid){
371
237
char *cmdline_filename;
428
294
char **argv = malloc((argz_count(cmdline, cmdline_len) + 1)
429
295
* sizeof(char *)); /* Get number of args */
430
296
if(argv == NULL){
431
error_plus(0, errno, "argv = malloc()");
297
error(0, errno, "argv = malloc()");
435
301
argz_extract(cmdline, cmdline_len, argv); /* Create argv */
302
return (const char **)argv;
439
305
int main(__attribute__((unused))int argc,
440
306
__attribute__((unused))char **argv){
442
308
char *prompt_arg;
443
309
pid_t plymouth_command_pid;
448
struct argp_option options[] = {
449
{ .name = "prompt", .key = 128, .arg = "PROMPT",
450
.doc = "The prompt to show" },
451
{ .name = "debug", .key = 129,
452
.doc = "Debug mode" },
456
__attribute__((nonnull(3)))
457
error_t parse_opt (int key, char *arg, __attribute__((unused))
458
struct argp_state *state){
461
case 128: /* --prompt */
464
fprintf_plus(stderr, "Custom prompt \"%s\"\n", prompt);
467
case 129: /* --debug */
471
return ARGP_ERR_UNKNOWN;
476
struct argp argp = { .options = options, .parser = parse_opt,
478
.doc = "Mandos plymouth -- Read and"
479
" output a password" };
480
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, NULL, NULL);
487
error_plus(0, errno, "argp_parse");
490
error_plus(0, errno, "argp_parse");
495
313
/* test -x /bin/plymouth */
496
314
ret = access(plymouth_path, X_OK);
498
316
/* Plymouth is probably not installed. Don't print an error
499
317
message, just exit. */
501
fprintf_plus(stderr, "Plymouth (%s) not found\n",
504
318
exit(EX_UNAVAILABLE);
513
327
*sig != 0; sig++){
514
328
ret = sigaddset(&new_action.sa_mask, *sig);
516
error_plus(EX_OSERR, errno, "sigaddset");
330
error(EX_OSERR, errno, "sigaddset");
518
332
ret = sigaction(*sig, NULL, &old_action);
520
error_plus(EX_OSERR, errno, "sigaction");
334
error(EX_OSERR, errno, "sigaction");
522
336
if(old_action.sa_handler != SIG_IGN){
523
337
ret = sigaction(*sig, &new_action, NULL);
525
error_plus(EX_OSERR, errno, "sigaction");
339
error(EX_OSERR, errno, "sigaction");
541
355
/* Plymouth is probably not running. Don't print an error
542
356
message, just exit. */
544
fprintf_plus(stderr, "Plymouth not running\n");
546
357
exit(EX_UNAVAILABLE);
550
ret = asprintf(&prompt_arg, "--prompt=%s", prompt);
552
char *made_prompt = makeprompt();
553
ret = asprintf(&prompt_arg, "--prompt=%s", made_prompt);
360
prompt = makeprompt();
361
ret = asprintf(&prompt_arg, "--prompt=%s", prompt);
557
error_plus(EX_OSERR, errno, "asprintf");
364
error(EX_OSERR, errno, "asprintf");
560
367
/* plymouth ask-for-password --prompt="$prompt" */
562
fprintf_plus(stderr, "Prompting for password via Plymouth\n");
564
368
bret = exec_and_wait(&plymouth_command_pid,
565
369
plymouth_path, (const char *[])
566
370
{ plymouth_path, "ask-for-password",
577
381
kill_and_wait(plymouth_command_pid);
579
char **plymouthd_argv = NULL;
383
const char **plymouthd_argv;
580
384
pid_t pid = get_pid();
582
error_plus(0, 0, "plymouthd pid not found");
386
error(0, 0, "plymouthd pid not found");
387
plymouthd_argv = plymouthd_default_argv;
584
389
plymouthd_argv = getargv(pid);
588
393
{ plymouth_path, "quit", NULL },
591
if(plymouthd_argv != NULL){
592
free(*plymouthd_argv);
593
free(plymouthd_argv);
595
396
exit(EXIT_FAILURE);
597
bret = exec_and_wait(NULL, plymouthd_path,
598
(plymouthd_argv != NULL)
599
? (const char * const *)plymouthd_argv
600
: plymouthd_default_argv,
398
bret = exec_and_wait(NULL, plymouthd_path, plymouthd_argv,
602
if(plymouthd_argv != NULL){
603
free(*plymouthd_argv);
604
free(plymouthd_argv);
607
401
exit(EXIT_FAILURE);
added
removed
plugins.d/plymouth.c
