3
3
* Plymouth - Read a password from Plymouth and output it
5
* Copyright © 2010-2018 Teddy Hogeborn
6
* Copyright © 2010-2018 Björn Påhlsson
5
* Copyright © 2010-2019 Teddy Hogeborn
6
* Copyright © 2010-2019 Björn Påhlsson
8
8
* This file is part of Mandos.
44
44
STDERR_FILENO, execv(), access() */
45
45
#include <stdlib.h> /* free(), EXIT_FAILURE, realloc(),
46
46
EXIT_SUCCESS, malloc(), _exit(),
47
getenv(), reallocarray() */
48
48
#include <dirent.h> /* scandir(), alphasort() */
49
49
#include <inttypes.h> /* intmax_t, strtoumax(), SCNuMAX */
50
50
#include <sys/stat.h> /* struct stat, lstat() */
53
53
#include <errno.h> /* TEMP_FAILURE_RETRY */
54
54
#include <argz.h> /* argz_count(), argz_extract() */
55
55
#include <stdarg.h> /* va_list, va_start(), ... */
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>";
59
62
/* Used by Ubuntu 11.04 (Natty Narwahl) */
60
63
const char plymouth_old_old_pid[] = "/dev/.initramfs/plymouth.pid";
77
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);
80
92
/* Function to use when printing errors */
81
93
__attribute__((format (gnu_printf, 3, 4)))
82
94
void error_plus(int status, int errnum, const char *formatstring,
160
172
__attribute__((nonnull (2, 3)))
161
173
bool exec_and_wait(pid_t *pid_return, const char *path,
162
const char * const *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");
169
188
error_plus(0, errno, "fork");
187
206
for (; argv[i] != NULL; i++){
188
tmp = realloc(new_argv, sizeof(const char *) * ((size_t)i + 2));
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 *));
190
error_plus(0, errno, "realloc");
220
error_plus(0, errno, "reallocarray");
209
239
and ((not interrupted_by_signal)
210
240
or (not interruptable)));
211
241
if(interrupted_by_signal and interruptable){
243
fprintf_plus(stderr, "Interrupted by signal\n");
215
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",
218
260
if(WIFEXITED(status) and (WEXITSTATUS(status) == 0)){
408
450
int main(__attribute__((unused))int argc,
409
451
__attribute__((unused))char **argv){
411
453
char *prompt_arg;
412
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");
416
506
/* test -x /bin/plymouth */
417
507
ret = access(plymouth_path, X_OK);
419
509
/* Plymouth is probably not installed. Don't print an error
420
510
message, just exit. */
512
fprintf_plus(stderr, "Plymouth (%s) not found\n",
421
515
exit(EX_UNAVAILABLE);
458
552
/* Plymouth is probably not running. Don't print an error
459
553
message, just exit. */
555
fprintf_plus(stderr, "Plymouth not running\n");
460
557
exit(EX_UNAVAILABLE);
463
prompt = makeprompt();
464
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);
467
568
error_plus(EX_OSERR, errno, "asprintf");
470
571
/* plymouth ask-for-password --prompt="$prompt" */
573
fprintf_plus(stderr, "Prompting for password via Plymouth\n");
471
575
bret = exec_and_wait(&plymouth_command_pid,
472
576
plymouth_path, (const char *[])
473
577
{ plymouth_path, "ask-for-password",