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- Committer: Teddy Hogeborn
- Date: 2010-09-11 18:34:55 UTC
- mfrom: (24.1.162 mandos)
- Revision ID: teddy@fukt.bsnet.se-20100911183455-kmzttvbywdbfbepm
Merge from Björn.
- files removed:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/plymouth.c
1
/* -*- coding: utf-8 -*- */
2
/*
3
* Plymouth - Read a password from Plymouth and output it
4
*
5
* Copyright © 2010-2016 Teddy Hogeborn
6
* Copyright © 2010-2016 Björn Påhlsson
7
*
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.
12
*
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.
17
*
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/>.
21
*
22
* Contact the authors at <mandos@recompile.se>.
23
*/
24
25
1
#define _GNU_SOURCE /* asprintf(), TEMP_FAILURE_RETRY() */
26
2
#include <signal.h> /* sig_atomic_t, struct sigaction,
27
3
sigemptyset(), sigaddset(), SIGINT,
30
6
#include <stdbool.h> /* bool, false, true */
31
7
#include <fcntl.h> /* open(), O_RDONLY */
32
8
#include <iso646.h> /* and, or, not*/
33
#include <sys/types.h> /* size_t, ssize_t, pid_t, struct
34
dirent, waitpid() */
9
#include <sys/types.h> /* size_t, ssize_t, pid_t, struct dirent,
10
waitpid() */
35
11
#include <sys/wait.h> /* waitpid() */
36
12
#include <stddef.h> /* NULL */
37
13
#include <string.h> /* strchr(), memcmp() */
38
#include <stdio.h> /* asprintf(), perror(), fopen(),
39
fscanf(), vasprintf(), fprintf(),
40
vfprintf() */
41
#include <unistd.h> /* close(), readlink(), read(),
42
fork(), setsid(), chdir(), dup2(),
14
#include <stdio.h> /* asprintf(), perror(), fopen(), fscanf() */
15
#include <unistd.h> /* close(), readlink(), read(), fork()
16
setsid(), chdir(), dup2()
43
17
STDERR_FILENO, execv(), access() */
44
18
#include <stdlib.h> /* free(), EXIT_FAILURE, realloc(),
45
19
EXIT_SUCCESS, malloc(), _exit(),
47
21
#include <dirent.h> /* scandir(), alphasort() */
48
22
#include <inttypes.h> /* intmax_t, strtoumax(), SCNuMAX */
49
23
#include <sys/stat.h> /* struct stat, lstat() */
50
#include <sysexits.h> /* EX_OSERR, EX_UNAVAILABLE */
24
#include <sysexits.h> /* EX_OSERR */
51
25
#include <error.h> /* error() */
52
26
#include <errno.h> /* TEMP_FAILURE_RETRY */
53
#include <argz.h> /* argz_count(), argz_extract() */
54
#include <stdarg.h> /* va_list, va_start(), ... */
27
#include <stdarg.h>
55
28
56
29
sig_atomic_t interrupted_by_signal = 0;
57
58
/* Used by Ubuntu 11.04 (Natty Narwahl) */
59
const char plymouth_old_pid[] = "/dev/.initramfs/plymouth.pid";
60
/* Used by Ubuntu 11.10 (Oneiric Ocelot) */
61
const char plymouth_pid[] = "/run/initramfs/plymouth.pid";
62
30
const char plymouth_pid[] = "/dev/.initramfs/plymouth.pid";
63
31
const char plymouth_path[] = "/bin/plymouth";
64
32
const char plymouthd_path[] = "/sbin/plymouthd";
65
const char *plymouthd_default_argv[] = {"/sbin/plymouthd",
66
"--mode=boot",
33
const char *plymouthd_default_argv[] = {"/sbin/plymouthd", "--mode=boot",
67
34
"--attach-to-session",
35
"--pid-file=/dev/.initramfs/plymouth.pid",
68
36
NULL };
69
37
70
38
static void termination_handler(__attribute__((unused))int signum){
74
42
interrupted_by_signal = 1;
75
43
}
76
44
77
/* Function to use when printing errors */
78
__attribute__((format (gnu_printf, 3, 4)))
79
void error_plus(int status, int errnum, const char *formatstring,
80
...){
81
va_list ap;
82
char *text;
83
int ret;
84
85
va_start(ap, formatstring);
86
ret = vasprintf(&text, formatstring, ap);
87
if(ret == -1){
88
fprintf(stderr, "Mandos plugin %s: ",
89
program_invocation_short_name);
90
vfprintf(stderr, formatstring, ap);
91
fprintf(stderr, ": ");
92
fprintf(stderr, "%s\n", strerror(errnum));
93
error(status, errno, "vasprintf while printing error");
94
return;
95
}
96
fprintf(stderr, "Mandos plugin ");
97
error(status, errnum, "%s", text);
98
free(text);
99
}
100
101
45
/* Create prompt string */
102
46
char *makeprompt(void){
103
47
int ret = 0;
104
48
char *prompt;
105
49
const char *const cryptsource = getenv("cryptsource");
106
50
const char *const crypttarget = getenv("crypttarget");
107
const char prompt_start[] = "Unlocking the disk";
108
const char prompt_end[] = "Enter passphrase";
51
const char prompt_start[] = "Enter passphrase to unlock the disk";
109
52
110
53
if(cryptsource == NULL){
111
54
if(crypttarget == NULL){
112
ret = asprintf(&prompt, "%s\n%s", prompt_start, prompt_end);
55
ret = asprintf(&prompt, "%s: ", prompt_start);
113
56
} else {
114
ret = asprintf(&prompt, "%s (%s)\n%s", prompt_start,
115
crypttarget, prompt_end);
57
ret = asprintf(&prompt, "%s (%s): ", prompt_start,
58
crypttarget);
116
59
}
117
60
} else {
118
61
if(crypttarget == NULL){
119
ret = asprintf(&prompt, "%s %s\n%s", prompt_start, cryptsource,
120
prompt_end);
62
ret = asprintf(&prompt, "%s %s: ", prompt_start, cryptsource);
121
63
} else {
122
ret = asprintf(&prompt, "%s %s (%s)\n%s", prompt_start,
123
cryptsource, crypttarget, prompt_end);
64
ret = asprintf(&prompt, "%s %s (%s): ", prompt_start,
65
cryptsource, crypttarget);
124
66
}
125
67
}
126
68
if(ret == -1){
137
79
bool become_a_daemon(void){
138
80
int ret = setuid(geteuid());
139
81
if(ret == -1){
140
error_plus(0, errno, "setuid");
82
error(0, errno, "setuid");
141
83
}
142
84
143
85
setsid();
144
86
ret = chdir("/");
145
87
if(ret == -1){
146
error_plus(0, errno, "chdir");
88
error(0, errno, "chdir");
147
89
return false;
148
90
}
149
91
ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
150
92
if(ret == -1){
151
error_plus(0, errno, "dup2");
93
error(0, errno, "dup2");
152
94
return false;
153
95
}
154
96
return true;
155
97
}
156
98
157
__attribute__((nonnull (2, 3)))
158
99
bool exec_and_wait(pid_t *pid_return, const char *path,
159
const char * const *argv, bool interruptable,
100
const char **argv, bool interruptable,
160
101
bool daemonize){
161
102
int status;
162
103
int ret;
163
104
pid_t pid;
164
105
pid = fork();
165
106
if(pid == -1){
166
error_plus(0, errno, "fork");
107
error(0, errno, "fork");
167
108
return false;
168
109
}
169
110
if(pid == 0){
173
114
_exit(EX_OSERR);
174
115
}
175
116
}
176
177
char **new_argv = malloc(sizeof(const char *));
178
if(new_argv == NULL){
179
error_plus(0, errno, "malloc");
180
_exit(EX_OSERR);
181
}
182
char **tmp;
117
118
char **new_argv = NULL;
119
char *tmp;
183
120
int i = 0;
184
for (; argv[i]!=NULL; i++){
185
tmp = realloc(new_argv, sizeof(const char *) * ((size_t)i + 2));
186
if(tmp == NULL){
187
error_plus(0, errno, "realloc");
121
for (; argv[i]!=(char *)NULL; i++){
122
tmp = realloc(new_argv, sizeof(const char *) * ((size_t)i + 1));
123
if (tmp == NULL){
124
error(0, errno, "realloc");
188
125
free(new_argv);
189
_exit(EX_OSERR);
126
_exit(EXIT_FAILURE);
190
127
}
191
new_argv = tmp;
128
new_argv = (char **)tmp;
192
129
new_argv[i] = strdup(argv[i]);
193
130
}
194
new_argv[i] = NULL;
131
new_argv[i] = (char *) NULL;
195
132
196
133
execv(path, (char *const *)new_argv);
197
error_plus(0, errno, "execv");
134
error(0, errno, "execv");
198
135
_exit(EXIT_FAILURE);
199
136
}
200
137
if(pid_return != NULL){
209
146
return false;
210
147
}
211
148
if(ret == -1){
212
error_plus(0, errno, "waitpid");
149
error(0, errno, "waitpid");
213
150
return false;
214
151
}
215
if(WIFEXITED(status) and (WEXITSTATUS(status) == 0)){
152
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
216
153
return true;
217
154
}
218
155
return false;
219
156
}
220
157
221
__attribute__((nonnull))
222
158
int is_plymouth(const struct dirent *proc_entry){
223
159
int ret;
224
160
{
225
uintmax_t proc_id;
161
uintmax_t maxvalue;
226
162
char *tmp;
227
163
errno = 0;
228
proc_id = strtoumax(proc_entry->d_name, &tmp, 10);
164
maxvalue = strtoumax(proc_entry->d_name, &tmp, 10);
229
165
230
if(errno != 0 or *tmp != '\0'
231
or proc_id != (uintmax_t)((pid_t)proc_id)){
166
if(errno != 0 or *tmp != '\0' or maxvalue != (uintmax_t)((pid_t)maxvalue)){
232
167
return 0;
233
168
}
234
169
}
235
char exe_target[sizeof(plymouthd_path)];
170
char exe_target[sizeof(plymouth_path)];
236
171
char *exe_link;
237
172
ret = asprintf(&exe_link, "/proc/%s/exe", proc_entry->d_name);
238
173
if(ret == -1){
239
error_plus(0, errno, "asprintf");
174
error(0, errno, "asprintf");
240
175
return 0;
241
176
}
242
177
243
178
struct stat exe_stat;
244
179
ret = lstat(exe_link, &exe_stat);
245
180
if(ret == -1){
246
181
free(exe_link);
247
182
if(errno != ENOENT){
248
error_plus(0, errno, "lstat");
183
error(0, errno, "lstat");
249
184
}
250
185
return 0;
251
186
}
256
191
free(exe_link);
257
192
return 0;
258
193
}
259
194
260
195
ssize_t sret = readlink(exe_link, exe_target, sizeof(exe_target));
261
196
free(exe_link);
262
if((sret != (ssize_t)sizeof(plymouthd_path)-1) or
263
(memcmp(plymouthd_path, exe_target,
264
sizeof(plymouthd_path)-1) != 0)){
197
if((sret != (ssize_t)sizeof(plymouth_path)-1) or
198
(memcmp(plymouth_path, exe_target,
199
sizeof(plymouth_path)-1) != 0)){
265
200
return 0;
266
201
}
267
202
return 1;
269
204
270
205
pid_t get_pid(void){
271
206
int ret;
272
uintmax_t proc_id = 0;
273
207
FILE *pidfile = fopen(plymouth_pid, "r");
274
/* Try the new pid file location */
208
uintmax_t maxvalue = 0;
275
209
if(pidfile != NULL){
276
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
210
ret = fscanf(pidfile, "%" SCNuMAX, &maxvalue);
277
211
if(ret != 1){
278
proc_id = 0;
212
maxvalue = 0;
279
213
}
280
214
fclose(pidfile);
281
215
}
282
/* Try the old pid file location */
283
if(proc_id == 0){
284
pidfile = fopen(plymouth_pid, "r");
285
if(pidfile != NULL){
286
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
287
if(ret != 1){
288
proc_id = 0;
289
}
290
fclose(pidfile);
291
}
292
}
293
/* Look for a plymouth process */
294
if(proc_id == 0){
295
struct dirent **direntries = NULL;
216
if(maxvalue == 0){
217
struct dirent **direntries;
296
218
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
297
if(ret == -1){
298
error_plus(0, errno, "scandir");
299
}
300
if(ret > 0){
301
ret = sscanf(direntries[0]->d_name, "%" SCNuMAX, &proc_id);
302
if(ret < 0){
303
error_plus(0, errno, "sscanf");
304
}
305
}
306
/* scandir might preallocate for this variable (man page unclear).
307
even if ret == 0, therefore we need to free it. */
308
free(direntries);
219
sscanf(direntries[0]->d_name, "%" SCNuMAX, &maxvalue);
309
220
}
310
221
pid_t pid;
311
pid = (pid_t)proc_id;
312
if((uintmax_t)pid == proc_id){
222
pid = (pid_t)maxvalue;
223
if((uintmax_t)pid == maxvalue){
313
224
return pid;
314
225
}
315
226
316
227
return 0;
317
228
}
318
229
319
const char * const * getargv(pid_t pid){
230
const char **getargv(pid_t pid){
320
231
int cl_fd;
321
232
char *cmdline_filename;
322
233
ssize_t sret;
325
236
ret = asprintf(&cmdline_filename, "/proc/%" PRIuMAX "/cmdline",
326
237
(uintmax_t)pid);
327
238
if(ret == -1){
328
error_plus(0, errno, "asprintf");
239
error(0, errno, "asprintf");
329
240
return NULL;
330
241
}
331
242
333
244
cl_fd = open(cmdline_filename, O_RDONLY);
334
245
free(cmdline_filename);
335
246
if(cl_fd == -1){
336
error_plus(0, errno, "open");
247
error(0, errno, "open");
337
248
return NULL;
338
249
}
339
250
347
258
if(cmdline_len + blocksize > cmdline_allocated){
348
259
tmp = realloc(cmdline, cmdline_allocated + blocksize);
349
260
if(tmp == NULL){
350
error_plus(0, errno, "realloc");
261
error(0, errno, "realloc");
351
262
free(cmdline);
352
263
close(cl_fd);
353
264
return NULL;
360
271
sret = read(cl_fd, cmdline + cmdline_len,
361
272
cmdline_allocated - cmdline_len);
362
273
if(sret == -1){
363
error_plus(0, errno, "read");
274
error(0, errno, "read");
364
275
free(cmdline);
365
276
close(cl_fd);
366
277
return NULL;
369
280
} while(sret != 0);
370
281
ret = close(cl_fd);
371
282
if(ret == -1){
372
error_plus(0, errno, "close");
283
error(0, errno, "close");
373
284
free(cmdline);
374
285
return NULL;
375
286
}
376
287
377
288
/* we got cmdline and cmdline_len, ignore rest... */
378
char **argv = malloc((argz_count(cmdline, cmdline_len) + 1)
379
* sizeof(char *)); /* Get number of args */
380
if(argv == NULL){
381
error_plus(0, errno, "argv = malloc()");
382
free(cmdline);
383
return NULL;
289
const char **argv = NULL;
290
size_t argv_size = 0;
291
for(char *arg = cmdline; arg-cmdline < (ssize_t)cmdline_len;
292
arg = strchr(arg, '\0')+1){
293
tmp = realloc(argv, ((++argv_size)+1)*sizeof(char *));
294
if(tmp == NULL){
295
error(0, errno, "realloc");
296
free(argv);
297
return NULL;
298
}
299
argv = (const char **)tmp;
300
argv[argv_size-1] = arg;
384
301
}
385
argz_extract(cmdline, cmdline_len, argv); /* Create argv */
386
return (const char * const *)argv;
302
argv[argv_size] = NULL;
303
return argv;
387
304
}
388
305
389
306
int main(__attribute__((unused))int argc,
397
314
/* test -x /bin/plymouth */
398
315
ret = access(plymouth_path, X_OK);
399
316
if(ret == -1){
400
/* Plymouth is probably not installed. Don't print an error
401
message, just exit. */
402
exit(EX_UNAVAILABLE);
317
exit(EXIT_FAILURE);
403
318
}
404
319
405
320
{ /* Add signal handlers */
406
321
struct sigaction old_action,
407
322
new_action = { .sa_handler = termination_handler,
408
323
.sa_flags = 0 };
409
324
sigemptyset(&new_action.sa_mask);
410
for(int *sig = (int[]){ SIGINT, SIGHUP, SIGTERM, 0 };
411
*sig != 0; sig++){
325
for(int *sig = (int[]){ SIGINT, SIGHUP, SIGTERM, 0 }; *sig != 0; sig++){
412
326
ret = sigaddset(&new_action.sa_mask, *sig);
413
327
if(ret == -1){
414
error_plus(EX_OSERR, errno, "sigaddset");
328
error(0, errno, "sigaddset");
329
exit(EX_OSERR);
415
330
}
416
331
ret = sigaction(*sig, NULL, &old_action);
417
332
if(ret == -1){
418
error_plus(EX_OSERR, errno, "sigaction");
333
error(0, errno, "sigaction");
334
exit(EX_OSERR);
419
335
}
420
336
if(old_action.sa_handler != SIG_IGN){
421
337
ret = sigaction(*sig, &new_action, NULL);
422
338
if(ret == -1){
423
error_plus(EX_OSERR, errno, "sigaction");
339
error(0, errno, "sigaction");
340
exit(EX_OSERR);
424
341
}
425
342
}
426
343
}
427
344
}
428
345
429
346
/* plymouth --ping */
430
347
bret = exec_and_wait(&plymouth_command_pid, plymouth_path,
431
(const char *[])
432
{ plymouth_path, "--ping", NULL },
348
(const char *[]){ (const char *)plymouth_path, (const char *)"--ping", (const char *)NULL},
433
349
true, false);
434
350
if(not bret){
435
351
if(interrupted_by_signal){
436
352
kill_and_wait(plymouth_command_pid);
437
exit(EXIT_FAILURE);
438
353
}
439
/* Plymouth is probably not running. Don't print an error
440
message, just exit. */
441
exit(EX_UNAVAILABLE);
354
exit(EXIT_FAILURE);
442
355
}
443
356
444
357
prompt = makeprompt();
445
358
ret = asprintf(&prompt_arg, "--prompt=%s", prompt);
446
359
free(prompt);
447
360
if(ret == -1){
448
error_plus(EX_OSERR, errno, "asprintf");
361
error(0, errno, "asprintf");
362
exit(EXIT_FAILURE);
449
363
}
450
364
451
365
/* plymouth ask-for-password --prompt="$prompt" */
452
bret = exec_and_wait(&plymouth_command_pid,
453
plymouth_path, (const char *[])
454
{ plymouth_path, "ask-for-password",
455
prompt_arg, NULL },
366
bret = exec_and_wait(&plymouth_command_pid, plymouth_path,
367
(const char *[]){plymouth_path, "ask-for-password", prompt_arg, NULL},
456
368
true, false);
457
369
free(prompt_arg);
370
if(not bret){
371
if(interrupted_by_signal){
372
kill_and_wait(plymouth_command_pid);
373
} else {
374
exit(EXIT_FAILURE);
375
}
376
}
377
458
378
if(bret){
459
379
exit(EXIT_SUCCESS);
460
380
}
461
if(not interrupted_by_signal){
462
/* exec_and_wait failed for some other reason */
463
exit(EXIT_FAILURE);
464
}
465
kill_and_wait(plymouth_command_pid);
466
381
467
const char * const *plymouthd_argv;
382
const char **plymouthd_argv = NULL;
468
383
pid_t pid = get_pid();
469
384
if(pid == 0){
470
error_plus(0, 0, "plymouthd pid not found");
385
error(0, 0, "plymouthd pid not found");
386
} else {
387
plymouthd_argv = getargv(pid);
388
}
389
if(plymouthd_argv == NULL){
471
390
plymouthd_argv = plymouthd_default_argv;
472
} else {
473
plymouthd_argv = getargv(pid);
474
391
}
475
392
476
bret = exec_and_wait(NULL, plymouth_path, (const char *[])
477
{ plymouth_path, "quit", NULL },
478
false, false);
479
if(not bret){
480
exit(EXIT_FAILURE);
481
}
482
bret = exec_and_wait(NULL, plymouthd_path, plymouthd_argv,
483
false, true);
484
if(not bret){
485
exit(EXIT_FAILURE);
486
}
487
exec_and_wait(NULL, plymouth_path, (const char *[])
488
{ plymouth_path, "show-splash", NULL },
489
false, false);
393
bret = exec_and_wait(NULL, plymouth_path,
394
(const char *[]){plymouth_path, "quit", NULL}, false, false);
395
if(not bret){
396
exit(EXIT_FAILURE);
397
}
398
bret = exec_and_wait(NULL, plymouthd_path, plymouthd_argv, false, true);
399
if(not bret){
400
exit(EXIT_FAILURE);
401
}
402
exec_and_wait(NULL, plymouth_path,
403
(const char *[]){ plymouth_path, "show-splash", NULL }, false, false);
490
404
exit(EXIT_FAILURE);
491
405
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0