1
/* -*- coding: utf-8 -*- */
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
14
* WITHOUT ANY WARRANTY; without even the implied warranty of
15
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16
* General Public License for more details.
18
* 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/>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
25
1
#define _GNU_SOURCE /* asprintf(), TEMP_FAILURE_RETRY() */
26
2
#include <signal.h> /* sig_atomic_t, struct sigaction,
27
3
sigemptyset(), sigaddset(), SIGINT,
36
12
#include <stddef.h> /* NULL */
37
13
#include <string.h> /* strchr(), memcmp() */
38
14
#include <stdio.h> /* asprintf(), perror(), fopen(),
39
fscanf(), vasprintf(), fprintf(), vfprintf() */
40
16
#include <unistd.h> /* close(), readlink(), read(),
41
17
fork(), setsid(), chdir(), dup2(),
42
18
STDERR_FILENO, execv(), access() */
50
26
#include <error.h> /* error() */
51
27
#include <errno.h> /* TEMP_FAILURE_RETRY */
52
28
#include <argz.h> /* argz_count(), argz_extract() */
53
#include <stdarg.h> /* va_list, va_start(), ... */
55
30
sig_atomic_t interrupted_by_signal = 0;
56
31
const char plymouth_pid[] = "/dev/.initramfs/plymouth.pid";
71
46
interrupted_by_signal = 1;
74
/* Function to use when printing errors */
75
void error_plus(int status, int errnum, const char *formatstring, ...){
80
va_start(ap, formatstring);
81
ret = vasprintf(&text, formatstring, ap);
83
fprintf(stderr, "Mandos plugin %s: ", program_invocation_short_name);
84
vfprintf(stderr, formatstring, ap);
85
fprintf(stderr, ": ");
86
fprintf(stderr, "%s\n", strerror(errnum));
87
error(status, errno, "vasprintf while printing error");
90
fprintf(stderr, "Mandos plugin ");
91
error(status, errnum, "%s", text);
95
49
/* Create prompt string */
96
50
char *makeprompt(void){
99
53
const char *const cryptsource = getenv("cryptsource");
100
54
const char *const crypttarget = getenv("crypttarget");
101
const char prompt_start[] = "Unlocking the disk";
102
const char prompt_end[] = "Enter passphrase";
55
const char prompt_start[] = "Enter passphrase to unlock the disk";
104
57
if(cryptsource == NULL){
105
58
if(crypttarget == NULL){
106
ret = asprintf(&prompt, "%s\n%s", prompt_start, prompt_end);
59
ret = asprintf(&prompt, "%s: ", prompt_start);
108
ret = asprintf(&prompt, "%s (%s)\n%s", prompt_start,
109
crypttarget, prompt_end);
61
ret = asprintf(&prompt, "%s (%s): ", prompt_start,
112
65
if(crypttarget == NULL){
113
ret = asprintf(&prompt, "%s %s\n%s", prompt_start, cryptsource,
66
ret = asprintf(&prompt, "%s %s: ", prompt_start, cryptsource);
116
ret = asprintf(&prompt, "%s %s (%s)\n%s", prompt_start,
117
cryptsource, crypttarget, prompt_end);
68
ret = asprintf(&prompt, "%s %s (%s): ", prompt_start,
69
cryptsource, crypttarget);
131
83
bool become_a_daemon(void){
132
84
int ret = setuid(geteuid());
134
error_plus(0, errno, "setuid");
86
error(0, errno, "setuid");
140
error_plus(0, errno, "chdir");
92
error(0, errno, "chdir");
143
95
ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
145
error_plus(0, errno, "dup2");
97
error(0, errno, "dup2");
170
122
char **new_argv = NULL;
173
for (; argv[i]!=NULL; i++){
125
for (; argv[i]!=(char *)NULL; i++){
174
126
tmp = realloc(new_argv, sizeof(const char *) * ((size_t)i + 1));
175
127
if (tmp == NULL){
176
error_plus(0, errno, "realloc");
128
error(0, errno, "realloc");
132
new_argv = (char **)tmp;
181
133
new_argv[i] = strdup(argv[i]);
135
new_argv[i] = (char *) NULL;
185
137
execv(path, (char *const *)new_argv);
186
error_plus(0, errno, "execv");
138
error(0, errno, "execv");
187
139
_exit(EXIT_FAILURE);
189
141
if(pid_return != NULL){
223
char exe_target[sizeof(plymouthd_path)];
175
char exe_target[sizeof(plymouth_path)];
225
177
ret = asprintf(&exe_link, "/proc/%s/exe", proc_entry->d_name);
227
error_plus(0, errno, "asprintf");
179
error(0, errno, "asprintf");
248
200
ssize_t sret = readlink(exe_link, exe_target, sizeof(exe_target));
250
if((sret != (ssize_t)sizeof(plymouthd_path)-1) or
251
(memcmp(plymouthd_path, exe_target,
252
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)){
269
221
if(maxvalue == 0){
270
struct dirent **direntries = NULL;
222
struct dirent **direntries;
271
223
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
273
error_plus(0, errno, "scandir");
276
ret = sscanf(direntries[0]->d_name, "%" SCNuMAX, &maxvalue);
278
error_plus(0, errno, "sscanf");
281
/* scandir might preallocate for this variable (man page unclear).
282
even if ret == 0, we need to free it. */
224
sscanf(direntries[0]->d_name, "%" SCNuMAX, &maxvalue);
286
227
pid = (pid_t)maxvalue;
386
327
*sig != 0; sig++){
387
328
ret = sigaddset(&new_action.sa_mask, *sig);
389
error_plus(EX_OSERR, errno, "sigaddset");
330
error(EX_OSERR, errno, "sigaddset");
391
332
ret = sigaction(*sig, NULL, &old_action);
393
error_plus(EX_OSERR, errno, "sigaction");
334
error(EX_OSERR, errno, "sigaction");
395
336
if(old_action.sa_handler != SIG_IGN){
396
337
ret = sigaction(*sig, &new_action, NULL);
398
error_plus(EX_OSERR, errno, "sigaction");
339
error(EX_OSERR, errno, "sigaction");
420
361
ret = asprintf(&prompt_arg, "--prompt=%s", prompt);
423
error_plus(EX_OSERR, errno, "asprintf");
364
error(EX_OSERR, errno, "asprintf");
426
367
/* plymouth ask-for-password --prompt="$prompt" */
442
383
const char **plymouthd_argv;
443
384
pid_t pid = get_pid();
445
error_plus(0, 0, "plymouthd pid not found");
386
error(0, 0, "plymouthd pid not found");
446
387
plymouthd_argv = plymouthd_default_argv;
448
389
plymouthd_argv = getargv(pid);