1
1
/* -*- coding: utf-8 -*- */
3
* Usplash - Read a password from usplash and output it
5
* Copyright © 2010 Teddy Hogeborn
6
* Copyright © 2010 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
3
* Plymouth - Read a password from Plymouth and output it
5
* Copyright © 2010-2017 Teddy Hogeborn
6
* Copyright © 2010-2017 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
26
#define _GNU_SOURCE /* asprintf(), TEMP_FAILURE_RETRY() */
36
37
#include <stddef.h> /* NULL */
37
38
#include <string.h> /* strchr(), memcmp() */
38
39
#include <stdio.h> /* asprintf(), perror(), fopen(),
40
fscanf(), vasprintf(), fprintf(),
40
42
#include <unistd.h> /* close(), readlink(), read(),
41
43
fork(), setsid(), chdir(), dup2(),
42
44
STDERR_FILENO, execv(), access() */
50
52
#include <error.h> /* error() */
51
53
#include <errno.h> /* TEMP_FAILURE_RETRY */
52
54
#include <argz.h> /* argz_count(), argz_extract() */
55
#include <stdarg.h> /* va_list, va_start(), ... */
54
57
sig_atomic_t interrupted_by_signal = 0;
55
const char plymouth_pid[] = "/dev/.initramfs/plymouth.pid";
59
/* Used by Ubuntu 11.04 (Natty Narwahl) */
60
const char plymouth_old_pid[] = "/dev/.initramfs/plymouth.pid";
61
/* Used by Ubuntu 11.10 (Oneiric Ocelot) */
62
const char plymouth_pid[] = "/run/initramfs/plymouth.pid";
56
64
const char plymouth_path[] = "/bin/plymouth";
57
65
const char plymouthd_path[] = "/sbin/plymouthd";
58
66
const char *plymouthd_default_argv[] = {"/sbin/plymouthd",
60
68
"--attach-to-session",
66
71
static void termination_handler(__attribute__((unused))int signum){
70
75
interrupted_by_signal = 1;
78
/* Function to use when printing errors */
79
__attribute__((format (gnu_printf, 3, 4)))
80
void error_plus(int status, int errnum, const char *formatstring,
86
va_start(ap, formatstring);
87
ret = vasprintf(&text, formatstring, ap);
89
fprintf(stderr, "Mandos plugin %s: ",
90
program_invocation_short_name);
91
vfprintf(stderr, formatstring, ap);
92
fprintf(stderr, ": ");
93
fprintf(stderr, "%s\n", strerror(errnum));
94
error(status, errno, "vasprintf while printing error");
97
fprintf(stderr, "Mandos plugin ");
98
error(status, errnum, "%s", text);
73
102
/* Create prompt string */
74
103
char *makeprompt(void){
77
106
const char *const cryptsource = getenv("cryptsource");
78
107
const char *const crypttarget = getenv("crypttarget");
79
const char prompt_start[] = "Enter passphrase to unlock the disk";
108
const char prompt_start[] = "Unlocking the disk";
109
const char prompt_end[] = "Enter passphrase";
81
111
if(cryptsource == NULL){
82
112
if(crypttarget == NULL){
83
ret = asprintf(&prompt, "%s: ", prompt_start);
113
ret = asprintf(&prompt, "%s\n%s", prompt_start, prompt_end);
85
ret = asprintf(&prompt, "%s (%s): ", prompt_start,
115
ret = asprintf(&prompt, "%s (%s)\n%s", prompt_start,
116
crypttarget, prompt_end);
89
119
if(crypttarget == NULL){
90
ret = asprintf(&prompt, "%s %s: ", prompt_start, cryptsource);
120
ret = asprintf(&prompt, "%s %s\n%s", prompt_start, cryptsource,
92
ret = asprintf(&prompt, "%s %s (%s): ", prompt_start,
93
cryptsource, crypttarget);
123
ret = asprintf(&prompt, "%s %s (%s)\n%s", prompt_start,
124
cryptsource, crypttarget, prompt_end);
107
138
bool become_a_daemon(void){
108
139
int ret = setuid(geteuid());
110
error(0, errno, "setuid");
141
error_plus(0, errno, "setuid");
114
145
ret = chdir("/");
116
error(0, errno, "chdir");
147
error_plus(0, errno, "chdir");
119
150
ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
121
error(0, errno, "dup2");
152
error_plus(0, errno, "dup2");
158
__attribute__((nonnull (2, 3)))
127
159
bool exec_and_wait(pid_t *pid_return, const char *path,
128
const char **argv, bool interruptable,
160
const char * const *argv, bool interruptable,
135
error(0, errno, "fork");
167
error_plus(0, errno, "fork");
146
char **new_argv = NULL;
178
char **new_argv = malloc(sizeof(const char *));
179
if(new_argv == NULL){
180
error_plus(0, errno, "malloc");
149
for (; argv[i]!=(char *)NULL; i++){
150
tmp = realloc(new_argv, sizeof(const char *) * ((size_t)i + 1));
152
error(0, errno, "realloc");
185
for (; argv[i] != NULL; i++){
186
tmp = realloc(new_argv, sizeof(const char *) * ((size_t)i + 2));
188
error_plus(0, errno, "realloc");
156
new_argv = (char **)tmp;
157
193
new_argv[i] = strdup(argv[i]);
159
new_argv[i] = (char *) NULL;
161
197
execv(path, (char *const *)new_argv);
162
error(0, errno, "execv");
198
error_plus(0, errno, "execv");
163
199
_exit(EXIT_FAILURE);
165
201
if(pid_return != NULL){
222
__attribute__((nonnull))
186
223
int is_plymouth(const struct dirent *proc_entry){
192
maxvalue = strtoumax(proc_entry->d_name, &tmp, 10);
229
proc_id = strtoumax(proc_entry->d_name, &tmp, 10);
194
231
if(errno != 0 or *tmp != '\0'
195
or maxvalue != (uintmax_t)((pid_t)maxvalue)){
232
or proc_id != (uintmax_t)((pid_t)proc_id)){
234
271
pid_t get_pid(void){
273
uintmax_t proc_id = 0;
236
274
FILE *pidfile = fopen(plymouth_pid, "r");
237
uintmax_t maxvalue = 0;
275
/* Try the new pid file location */
238
276
if(pidfile != NULL){
239
ret = fscanf(pidfile, "%" SCNuMAX, &maxvalue);
277
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
246
struct dirent **direntries;
283
/* Try the old pid file location */
285
pidfile = fopen(plymouth_pid, "r");
287
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
294
/* Look for a plymouth process */
296
struct dirent **direntries = NULL;
247
297
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
249
error(0, errno, "scandir");
299
error_plus(0, errno, "scandir");
252
ret = sscanf(direntries[0]->d_name, "%" SCNuMAX, &maxvalue);
254
error(0, errno, "sscanf");
302
ret = sscanf(direntries[0]->d_name, "%" SCNuMAX, &proc_id);
304
error_plus(0, errno, "sscanf");
307
/* scandir might preallocate for this variable (man page unclear).
308
even if ret == 0, therefore we need to free it. */
259
pid = (pid_t)maxvalue;
260
if((uintmax_t)pid == maxvalue){
312
pid = (pid_t)proc_id;
313
if((uintmax_t)pid == proc_id){
267
const char **getargv(pid_t pid){
320
const char * const * getargv(pid_t pid){
269
322
char *cmdline_filename;
326
379
char **argv = malloc((argz_count(cmdline, cmdline_len) + 1)
327
380
* sizeof(char *)); /* Get number of args */
328
381
if(argv == NULL){
329
error(0, errno, "argv = malloc()");
382
error_plus(0, errno, "argv = malloc()");
333
386
argz_extract(cmdline, cmdline_len, argv); /* Create argv */
334
return (const char **)argv;
387
return (const char * const *)argv;
337
390
int main(__attribute__((unused))int argc,
359
412
*sig != 0; sig++){
360
413
ret = sigaddset(&new_action.sa_mask, *sig);
362
error(EX_OSERR, errno, "sigaddset");
415
error_plus(EX_OSERR, errno, "sigaddset");
364
417
ret = sigaction(*sig, NULL, &old_action);
366
error(EX_OSERR, errno, "sigaction");
419
error_plus(EX_OSERR, errno, "sigaction");
368
421
if(old_action.sa_handler != SIG_IGN){
369
422
ret = sigaction(*sig, &new_action, NULL);
371
error(EX_OSERR, errno, "sigaction");
424
error_plus(EX_OSERR, errno, "sigaction");
413
466
kill_and_wait(plymouth_command_pid);
415
const char **plymouthd_argv;
468
const char * const *plymouthd_argv;
416
469
pid_t pid = get_pid();
418
error(0, 0, "plymouthd pid not found");
471
error_plus(0, 0, "plymouthd pid not found");
419
472
plymouthd_argv = plymouthd_default_argv;
421
474
plymouthd_argv = getargv(pid);