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 © 2010-2022 Teddy Hogeborn
6
* Copyright © 2010-2022 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
* Contact the authors at <mandos@fukt.bsnet.se>.
23
* Contact the authors at <mandos@recompile.se>.
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(),
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,
35
ARGP_ERR_UNKNOWN, struct argp,
36
argp_parse(), ARGP_IN_ORDER */
37
#include <stddef.h> /* NULL, size_t */
30
38
#include <stdbool.h> /* bool, false, true */
39
#include <stdio.h> /* FILE, fprintf(), vfprintf(),
40
vasprintf(), stderr, asprintf(),
41
fopen(), fscanf(), fclose(),
43
#include <stdarg.h> /* va_list, va_start(), vfprintf() */
44
#include <errno.h> /* program_invocation_short_name,
45
errno, ENOMEM, EINTR, ENOENT,
47
#include <string.h> /* strerror(), strdup(), memcmp() */
48
#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(),
64
#include <iso646.h> /* not, and, or */
65
#include <sysexits.h> /* EX_OSERR, EX_USAGE,
67
#include <stdint.h> /* SIZE_MAX */
68
#include <dirent.h> /* struct dirent, scandir(),
70
#include <inttypes.h> /* uintmax_t, strtoumax(), SCNuMAX,
72
#include <sys/stat.h> /* struct stat, lstat(), S_ISLNK() */
31
73
#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
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(), vfprintf() */
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(),
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 */
50
#include <error.h> /* error() */
51
#include <errno.h> /* TEMP_FAILURE_RETRY */
52
74
#include <argz.h> /* argz_count(), argz_extract() */
53
#include <stdarg.h> /* va_list, va_start(), ... */
55
76
sig_atomic_t interrupted_by_signal = 0;
56
const char plymouth_pid[] = "/dev/.initramfs/plymouth.pid";
77
const char *argp_program_version = "plymouth " VERSION;
78
const char *argp_program_bug_address = "<mandos@recompile.se>";
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";
57
87
const char plymouth_path[] = "/bin/plymouth";
58
88
const char plymouthd_path[] = "/sbin/plymouthd";
59
89
const char *plymouthd_default_argv[] = {"/sbin/plymouthd",
61
91
"--attach-to-session",
67
95
static void termination_handler(__attribute__((unused))int signum){
68
96
if(interrupted_by_signal){
71
99
interrupted_by_signal = 1;
102
__attribute__((format (gnu_printf, 2, 3), nonnull))
103
int fprintf_plus(FILE *stream, const char *format, ...){
105
va_start (ap, format);
106
fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name);
107
return vfprintf(stream, format, ap);
74
110
/* Function to use when printing errors */
75
void error_plus(int status, int errnum, const char *formatstring, ...){
111
__attribute__((format (gnu_printf, 3, 4)))
112
void error_plus(int status, int errnum, const char *formatstring,
80
118
va_start(ap, formatstring);
81
119
ret = vasprintf(&text, formatstring, ap);
83
fprintf(stderr, "Mandos plugin %s: ", program_invocation_short_name);
121
fprintf(stderr, "Mandos plugin %s: ",
122
program_invocation_short_name);
84
123
vfprintf(stderr, formatstring, ap);
85
124
fprintf(stderr, ": ");
86
125
fprintf(stderr, "%s\n", strerror(errnum));
258
333
pid_t get_pid(void){
335
uintmax_t proc_id = 0;
260
336
FILE *pidfile = fopen(plymouth_pid, "r");
261
uintmax_t maxvalue = 0;
337
/* Try the new pid file location */
262
338
if(pidfile != NULL){
263
ret = fscanf(pidfile, "%" SCNuMAX, &maxvalue);
339
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
345
/* Try the old pid file location */
347
pidfile = fopen(plymouth_old_pid, "r");
349
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
356
/* Try the old old pid file location */
358
pidfile = fopen(plymouth_old_old_pid, "r");
360
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
367
/* Look for a plymouth process */
270
369
struct dirent **direntries = NULL;
271
370
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
273
372
error_plus(0, errno, "scandir");
276
ret = sscanf(direntries[0]->d_name, "%" SCNuMAX, &maxvalue);
278
error_plus(0, errno, "sscanf");
375
const int num_entries = ret;
376
for(int i = 0; i < num_entries; i++){
378
ret = sscanf(direntries[i]->d_name, "%" SCNuMAX, &proc_id);
380
error_plus(0, errno, "sscanf");
281
386
/* scandir might preallocate for this variable (man page unclear).
282
even if ret == 0, we need to free it. */
387
even if ret == 0, therefore we need to free it. */
283
388
free(direntries);
286
pid = (pid_t)maxvalue;
287
if((uintmax_t)pid == maxvalue){
391
pid = (pid_t)proc_id;
392
if((uintmax_t)pid == proc_id){
294
const char **getargv(pid_t pid){
399
char **getargv(pid_t pid){
296
401
char *cmdline_filename;
360
465
argz_extract(cmdline, cmdline_len, argv); /* Create argv */
361
return (const char **)argv;
364
469
int main(__attribute__((unused))int argc,
365
470
__attribute__((unused))char **argv){
367
472
char *prompt_arg;
368
473
pid_t plymouth_command_pid;
478
struct argp_option options[] = {
479
{ .name = "prompt", .key = 128, .arg = "PROMPT",
480
.doc = "The prompt to show" },
481
{ .name = "debug", .key = 129,
482
.doc = "Debug mode" },
486
__attribute__((nonnull(3)))
487
error_t parse_opt (int key, char *arg, __attribute__((unused))
488
struct argp_state *state){
491
case 128: /* --prompt */
494
fprintf_plus(stderr, "Custom prompt \"%s\"\n", prompt);
497
case 129: /* --debug */
501
return ARGP_ERR_UNKNOWN;
506
struct argp argp = { .options = options, .parser = parse_opt,
508
.doc = "Mandos plymouth -- Read and"
509
" output a password" };
510
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, NULL, NULL);
517
error_plus(0, errno, "argp_parse");
520
error_plus(0, errno, "argp_parse");
372
525
/* test -x /bin/plymouth */
373
526
ret = access(plymouth_path, X_OK);
375
528
/* Plymouth is probably not installed. Don't print an error
376
529
message, just exit. */
531
fprintf_plus(stderr, "Plymouth (%s) not found\n",
377
534
exit(EX_UNAVAILABLE);
added
removed
plugins.d/plymouth.c
