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- Committer: Teddy Hogeborn
- Date: 2010-09-12 03:15:54 UTC
- Revision ID: teddy@fukt.bsnet.se-20100912031554-le622fn5c0hy61ys
* Makefile: Compile and install new "plymouth" plugin.
- files removed:
- debian/mandos-client.examples
- debian/source
- network-hooks.d
- 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 © 2010-2013 Teddy Hogeborn
6
* Copyright © 2010-2013 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
117
177
118
char **new_argv = NULL;
178
char **tmp;
119
char *tmp;
179
120
int i = 0;
180
for (; argv[i]!=NULL; i++){
121
for (; argv[i]!=(char *)NULL; i++){
181
122
tmp = realloc(new_argv, sizeof(const char *) * ((size_t)i + 1));
182
123
if (tmp == NULL){
183
error_plus(0, errno, "realloc");
124
error(0, errno, "realloc");
184
125
free(new_argv);
185
_exit(EX_OSERR);
126
_exit(EXIT_FAILURE);
186
127
}
187
new_argv = tmp;
128
new_argv = (char **)tmp;
188
129
new_argv[i] = strdup(argv[i]);
189
130
}
190
new_argv[i] = NULL;
131
new_argv[i] = (char *) NULL;
191
132
192
133
execv(path, (char *const *)new_argv);
193
error_plus(0, errno, "execv");
134
error(0, errno, "execv");
194
135
_exit(EXIT_FAILURE);
195
136
}
196
137
if(pid_return != NULL){
205
146
return false;
206
147
}
207
148
if(ret == -1){
208
error_plus(0, errno, "waitpid");
149
error(0, errno, "waitpid");
209
150
return false;
210
151
}
211
if(WIFEXITED(status) and (WEXITSTATUS(status) == 0)){
152
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
212
153
return true;
213
154
}
214
155
return false;
215
156
}
216
157
217
__attribute__((nonnull))
218
158
int is_plymouth(const struct dirent *proc_entry){
219
159
int ret;
220
160
{
221
uintmax_t proc_id;
161
uintmax_t maxvalue;
222
162
char *tmp;
223
163
errno = 0;
224
proc_id = strtoumax(proc_entry->d_name, &tmp, 10);
164
maxvalue = strtoumax(proc_entry->d_name, &tmp, 10);
225
165
226
if(errno != 0 or *tmp != '\0'
227
or proc_id != (uintmax_t)((pid_t)proc_id)){
166
if(errno != 0 or *tmp != '\0' or maxvalue != (uintmax_t)((pid_t)maxvalue)){
228
167
return 0;
229
168
}
230
169
}
231
char exe_target[sizeof(plymouthd_path)];
170
char exe_target[sizeof(plymouth_path)];
232
171
char *exe_link;
233
172
ret = asprintf(&exe_link, "/proc/%s/exe", proc_entry->d_name);
234
173
if(ret == -1){
235
error_plus(0, errno, "asprintf");
174
error(0, errno, "asprintf");
236
175
return 0;
237
176
}
238
177
239
178
struct stat exe_stat;
240
179
ret = lstat(exe_link, &exe_stat);
241
180
if(ret == -1){
242
181
free(exe_link);
243
182
if(errno != ENOENT){
244
error_plus(0, errno, "lstat");
183
error(0, errno, "lstat");
245
184
}
246
185
return 0;
247
186
}
252
191
free(exe_link);
253
192
return 0;
254
193
}
255
194
256
195
ssize_t sret = readlink(exe_link, exe_target, sizeof(exe_target));
257
196
free(exe_link);
258
if((sret != (ssize_t)sizeof(plymouthd_path)-1) or
259
(memcmp(plymouthd_path, exe_target,
260
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)){
261
200
return 0;
262
201
}
263
202
return 1;
265
204
266
205
pid_t get_pid(void){
267
206
int ret;
268
uintmax_t proc_id = 0;
269
207
FILE *pidfile = fopen(plymouth_pid, "r");
270
/* Try the new pid file location */
208
uintmax_t maxvalue = 0;
271
209
if(pidfile != NULL){
272
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
210
ret = fscanf(pidfile, "%" SCNuMAX, &maxvalue);
273
211
if(ret != 1){
274
proc_id = 0;
212
maxvalue = 0;
275
213
}
276
214
fclose(pidfile);
277
215
}
278
/* Try the old pid file location */
279
if(proc_id == 0){
280
pidfile = fopen(plymouth_pid, "r");
281
if(pidfile != NULL){
282
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
283
if(ret != 1){
284
proc_id = 0;
285
}
286
fclose(pidfile);
287
}
288
}
289
/* Look for a plymouth process */
290
if(proc_id == 0){
291
struct dirent **direntries = NULL;
216
if(maxvalue == 0){
217
struct dirent **direntries;
292
218
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
293
if (ret == -1){
294
error_plus(0, errno, "scandir");
295
}
296
if (ret > 0){
297
ret = sscanf(direntries[0]->d_name, "%" SCNuMAX, &proc_id);
298
if (ret < 0){
299
error_plus(0, errno, "sscanf");
300
}
301
}
302
/* scandir might preallocate for this variable (man page unclear).
303
even if ret == 0, therefore we need to free it. */
304
free(direntries);
219
sscanf(direntries[0]->d_name, "%" SCNuMAX, &maxvalue);
305
220
}
306
221
pid_t pid;
307
pid = (pid_t)proc_id;
308
if((uintmax_t)pid == proc_id){
222
pid = (pid_t)maxvalue;
223
if((uintmax_t)pid == maxvalue){
309
224
return pid;
310
225
}
311
226
312
227
return 0;
313
228
}
314
229
315
const char * const * getargv(pid_t pid){
230
const char **getargv(pid_t pid){
316
231
int cl_fd;
317
232
char *cmdline_filename;
318
233
ssize_t sret;
321
236
ret = asprintf(&cmdline_filename, "/proc/%" PRIuMAX "/cmdline",
322
237
(uintmax_t)pid);
323
238
if(ret == -1){
324
error_plus(0, errno, "asprintf");
239
error(0, errno, "asprintf");
325
240
return NULL;
326
241
}
327
242
329
244
cl_fd = open(cmdline_filename, O_RDONLY);
330
245
free(cmdline_filename);
331
246
if(cl_fd == -1){
332
error_plus(0, errno, "open");
247
error(0, errno, "open");
333
248
return NULL;
334
249
}
335
250
343
258
if(cmdline_len + blocksize > cmdline_allocated){
344
259
tmp = realloc(cmdline, cmdline_allocated + blocksize);
345
260
if(tmp == NULL){
346
error_plus(0, errno, "realloc");
261
error(0, errno, "realloc");
347
262
free(cmdline);
348
263
close(cl_fd);
349
264
return NULL;
356
271
sret = read(cl_fd, cmdline + cmdline_len,
357
272
cmdline_allocated - cmdline_len);
358
273
if(sret == -1){
359
error_plus(0, errno, "read");
274
error(0, errno, "read");
360
275
free(cmdline);
361
276
close(cl_fd);
362
277
return NULL;
365
280
} while(sret != 0);
366
281
ret = close(cl_fd);
367
282
if(ret == -1){
368
error_plus(0, errno, "close");
283
error(0, errno, "close");
369
284
free(cmdline);
370
285
return NULL;
371
286
}
372
287
373
288
/* we got cmdline and cmdline_len, ignore rest... */
374
char **argv = malloc((argz_count(cmdline, cmdline_len) + 1)
375
* sizeof(char *)); /* Get number of args */
376
if(argv == NULL){
377
error_plus(0, errno, "argv = malloc()");
378
free(cmdline);
379
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;
380
301
}
381
argz_extract(cmdline, cmdline_len, argv); /* Create argv */
382
return (const char * const *)argv;
302
argv[argv_size] = NULL;
303
return argv;
383
304
}
384
305
385
306
int main(__attribute__((unused))int argc,
393
314
/* test -x /bin/plymouth */
394
315
ret = access(plymouth_path, X_OK);
395
316
if(ret == -1){
396
/* Plymouth is probably not installed. Don't print an error
397
message, just exit. */
398
exit(EX_UNAVAILABLE);
317
exit(EXIT_FAILURE);
399
318
}
400
319
401
320
{ /* Add signal handlers */
402
321
struct sigaction old_action,
403
322
new_action = { .sa_handler = termination_handler,
404
323
.sa_flags = 0 };
405
324
sigemptyset(&new_action.sa_mask);
406
for(int *sig = (int[]){ SIGINT, SIGHUP, SIGTERM, 0 };
407
*sig != 0; sig++){
325
for(int *sig = (int[]){ SIGINT, SIGHUP, SIGTERM, 0 }; *sig != 0; sig++){
408
326
ret = sigaddset(&new_action.sa_mask, *sig);
409
327
if(ret == -1){
410
error_plus(EX_OSERR, errno, "sigaddset");
328
error(0, errno, "sigaddset");
329
exit(EX_OSERR);
411
330
}
412
331
ret = sigaction(*sig, NULL, &old_action);
413
332
if(ret == -1){
414
error_plus(EX_OSERR, errno, "sigaction");
333
error(0, errno, "sigaction");
334
exit(EX_OSERR);
415
335
}
416
336
if(old_action.sa_handler != SIG_IGN){
417
337
ret = sigaction(*sig, &new_action, NULL);
418
338
if(ret == -1){
419
error_plus(EX_OSERR, errno, "sigaction");
339
error(0, errno, "sigaction");
340
exit(EX_OSERR);
420
341
}
421
342
}
422
343
}
423
344
}
424
345
425
346
/* plymouth --ping */
426
347
bret = exec_and_wait(&plymouth_command_pid, plymouth_path,
427
(const char *[])
428
{ plymouth_path, "--ping", NULL },
348
(const char *[]){ (const char *)plymouth_path, (const char *)"--ping", (const char *)NULL},
429
349
true, false);
430
350
if(not bret){
431
351
if(interrupted_by_signal){
432
352
kill_and_wait(plymouth_command_pid);
433
exit(EXIT_FAILURE);
434
353
}
435
/* Plymouth is probably not running. Don't print an error
436
message, just exit. */
437
exit(EX_UNAVAILABLE);
354
exit(EXIT_FAILURE);
438
355
}
439
356
440
357
prompt = makeprompt();
441
358
ret = asprintf(&prompt_arg, "--prompt=%s", prompt);
442
359
free(prompt);
443
360
if(ret == -1){
444
error_plus(EX_OSERR, errno, "asprintf");
361
error(0, errno, "asprintf");
362
exit(EXIT_FAILURE);
445
363
}
446
364
447
365
/* plymouth ask-for-password --prompt="$prompt" */
448
bret = exec_and_wait(&plymouth_command_pid,
449
plymouth_path, (const char *[])
450
{ plymouth_path, "ask-for-password",
451
prompt_arg, NULL },
366
bret = exec_and_wait(&plymouth_command_pid, plymouth_path,
367
(const char *[]){plymouth_path, "ask-for-password", prompt_arg, NULL},
452
368
true, false);
453
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
454
378
if(bret){
455
379
exit(EXIT_SUCCESS);
456
380
}
457
if(not interrupted_by_signal){
458
/* exec_and_wait failed for some other reason */
459
exit(EXIT_FAILURE);
460
}
461
kill_and_wait(plymouth_command_pid);
462
381
463
const char * const *plymouthd_argv;
382
const char **plymouthd_argv = NULL;
464
383
pid_t pid = get_pid();
465
384
if(pid == 0){
466
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){
467
390
plymouthd_argv = plymouthd_default_argv;
468
} else {
469
plymouthd_argv = getargv(pid);
470
391
}
471
392
472
bret = exec_and_wait(NULL, plymouth_path, (const char *[])
473
{ plymouth_path, "quit", NULL },
474
false, false);
475
if(not bret){
476
exit(EXIT_FAILURE);
477
}
478
bret = exec_and_wait(NULL, plymouthd_path, plymouthd_argv,
479
false, true);
480
if(not bret){
481
exit(EXIT_FAILURE);
482
}
483
exec_and_wait(NULL, plymouth_path, (const char *[])
484
{ plymouth_path, "show-splash", NULL },
485
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);
486
404
exit(EXIT_FAILURE);
487
405
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0