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- Committer: Teddy Hogeborn
- Date: 2012-06-16 19:30:08 UTC
- Revision ID: teddy@recompile.se-20120616193008-2erbfaw5a5y3yay1
* debian/mandos-client.README.Debian: Update documentation for using
multiple interfaces.
multiple interfaces.
- files added:
- 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 © 2010-2012 Teddy Hogeborn
6
* Copyright © 2010-2012 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
1
25
#define _GNU_SOURCE /* asprintf(), TEMP_FAILURE_RETRY() */
2
26
#include <signal.h> /* sig_atomic_t, struct sigaction,
3
27
sigemptyset(), sigaddset(), SIGINT,
6
30
#include <stdbool.h> /* bool, false, true */
7
31
#include <fcntl.h> /* open(), O_RDONLY */
8
32
#include <iso646.h> /* and, or, not*/
9
#include <sys/types.h> /* size_t, ssize_t, pid_t, struct dirent,
10
waitpid() */
33
#include <sys/types.h> /* size_t, ssize_t, pid_t, struct
34
dirent, waitpid() */
11
35
#include <sys/wait.h> /* waitpid() */
12
36
#include <stddef.h> /* NULL */
13
37
#include <string.h> /* strchr(), memcmp() */
14
#include <stdio.h> /* asprintf(), perror(), fopen(), fscanf() */
15
#include <unistd.h> /* close(), readlink(), read(), fork()
16
setsid(), chdir(), dup2()
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(),
17
43
STDERR_FILENO, execv(), access() */
18
44
#include <stdlib.h> /* free(), EXIT_FAILURE, realloc(),
19
45
EXIT_SUCCESS, malloc(), _exit(),
21
47
#include <dirent.h> /* scandir(), alphasort() */
22
48
#include <inttypes.h> /* intmax_t, strtoumax(), SCNuMAX */
23
49
#include <sys/stat.h> /* struct stat, lstat() */
24
#include <sysexits.h> /* EX_OSERR */
50
#include <sysexits.h> /* EX_OSERR, EX_UNAVAILABLE */
25
51
#include <error.h> /* error() */
26
52
#include <errno.h> /* TEMP_FAILURE_RETRY */
27
#include <stdarg.h>
53
#include <argz.h> /* argz_count(), argz_extract() */
54
#include <stdarg.h> /* va_list, va_start(), ... */
28
55
29
56
sig_atomic_t interrupted_by_signal = 0;
30
const char plymouth_pid[] = "/dev/.initramfs/plymouth.pid";
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
31
63
const char plymouth_path[] = "/bin/plymouth";
32
64
const char plymouthd_path[] = "/sbin/plymouthd";
33
const char *plymouthd_default_argv[] = {"/sbin/plymouthd", "--mode=boot",
65
const char *plymouthd_default_argv[] = {"/sbin/plymouthd",
66
"--mode=boot",
34
67
"--attach-to-session",
35
"--pid-file=/dev/.initramfs/plymouth.pid",
36
68
NULL };
37
69
38
70
static void termination_handler(__attribute__((unused))int signum){
42
74
interrupted_by_signal = 1;
43
75
}
44
76
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
45
101
/* Create prompt string */
46
102
char *makeprompt(void){
47
103
int ret = 0;
48
104
char *prompt;
49
105
const char *const cryptsource = getenv("cryptsource");
50
106
const char *const crypttarget = getenv("crypttarget");
51
const char prompt_start[] = "Enter passphrase to unlock the disk";
107
const char prompt_start[] = "Unlocking the disk";
108
const char prompt_end[] = "Enter passphrase";
52
109
53
110
if(cryptsource == NULL){
54
111
if(crypttarget == NULL){
55
ret = asprintf(&prompt, "%s: ", prompt_start);
112
ret = asprintf(&prompt, "%s\n%s", prompt_start, prompt_end);
56
113
} else {
57
ret = asprintf(&prompt, "%s (%s): ", prompt_start,
58
crypttarget);
114
ret = asprintf(&prompt, "%s (%s)\n%s", prompt_start,
115
crypttarget, prompt_end);
59
116
}
60
117
} else {
61
118
if(crypttarget == NULL){
62
ret = asprintf(&prompt, "%s %s: ", prompt_start, cryptsource);
119
ret = asprintf(&prompt, "%s %s\n%s", prompt_start, cryptsource,
120
prompt_end);
63
121
} else {
64
ret = asprintf(&prompt, "%s %s (%s): ", prompt_start,
65
cryptsource, crypttarget);
122
ret = asprintf(&prompt, "%s %s (%s)\n%s", prompt_start,
123
cryptsource, crypttarget, prompt_end);
66
124
}
67
125
}
68
126
if(ret == -1){
79
137
bool become_a_daemon(void){
80
138
int ret = setuid(geteuid());
81
139
if(ret == -1){
82
error(0, errno, "setuid");
140
error_plus(0, errno, "setuid");
83
141
}
84
142
85
143
setsid();
86
144
ret = chdir("/");
87
145
if(ret == -1){
88
error(0, errno, "chdir");
146
error_plus(0, errno, "chdir");
89
147
return false;
90
148
}
91
149
ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
92
150
if(ret == -1){
93
error(0, errno, "dup2");
151
error_plus(0, errno, "dup2");
94
152
return false;
95
153
}
96
154
return true;
97
155
}
98
156
157
__attribute__((nonnull (2, 3)))
99
158
bool exec_and_wait(pid_t *pid_return, const char *path,
100
159
const char **argv, bool interruptable,
101
160
bool daemonize){
104
163
pid_t pid;
105
164
pid = fork();
106
165
if(pid == -1){
107
error(0, errno, "fork");
166
error_plus(0, errno, "fork");
108
167
return false;
109
168
}
110
169
if(pid == 0){
114
173
_exit(EX_OSERR);
115
174
}
116
175
}
117
176
118
177
char **new_argv = NULL;
119
char *tmp;
178
char **tmp;
120
179
int i = 0;
121
for (; argv[i]!=(char *)NULL; i++){
180
for (; argv[i]!=NULL; i++){
122
181
tmp = realloc(new_argv, sizeof(const char *) * ((size_t)i + 1));
123
182
if (tmp == NULL){
124
error(0, errno, "realloc");
183
error_plus(0, errno, "realloc");
125
184
free(new_argv);
126
_exit(EXIT_FAILURE);
185
_exit(EX_OSERR);
127
186
}
128
new_argv = (char **)tmp;
187
new_argv = tmp;
129
188
new_argv[i] = strdup(argv[i]);
130
189
}
131
new_argv[i] = (char *) NULL;
190
new_argv[i] = NULL;
132
191
133
192
execv(path, (char *const *)new_argv);
134
error(0, errno, "execv");
193
error_plus(0, errno, "execv");
135
194
_exit(EXIT_FAILURE);
136
195
}
137
196
if(pid_return != NULL){
146
205
return false;
147
206
}
148
207
if(ret == -1){
149
error(0, errno, "waitpid");
208
error_plus(0, errno, "waitpid");
150
209
return false;
151
210
}
152
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
211
if(WIFEXITED(status) and (WEXITSTATUS(status) == 0)){
153
212
return true;
154
213
}
155
214
return false;
156
215
}
157
216
217
__attribute__((nonnull))
158
218
int is_plymouth(const struct dirent *proc_entry){
159
219
int ret;
160
220
{
161
uintmax_t maxvalue;
221
uintmax_t proc_id;
162
222
char *tmp;
163
223
errno = 0;
164
maxvalue = strtoumax(proc_entry->d_name, &tmp, 10);
224
proc_id = strtoumax(proc_entry->d_name, &tmp, 10);
165
225
166
if(errno != 0 or *tmp != '\0' or maxvalue != (uintmax_t)((pid_t)maxvalue)){
226
if(errno != 0 or *tmp != '\0'
227
or proc_id != (uintmax_t)((pid_t)proc_id)){
167
228
return 0;
168
229
}
169
230
}
170
char exe_target[sizeof(plymouth_path)];
231
char exe_target[sizeof(plymouthd_path)];
171
232
char *exe_link;
172
233
ret = asprintf(&exe_link, "/proc/%s/exe", proc_entry->d_name);
173
234
if(ret == -1){
174
error(0, errno, "asprintf");
235
error_plus(0, errno, "asprintf");
175
236
return 0;
176
237
}
177
238
178
239
struct stat exe_stat;
179
240
ret = lstat(exe_link, &exe_stat);
180
241
if(ret == -1){
181
242
free(exe_link);
182
243
if(errno != ENOENT){
183
error(0, errno, "lstat");
244
error_plus(0, errno, "lstat");
184
245
}
185
246
return 0;
186
247
}
191
252
free(exe_link);
192
253
return 0;
193
254
}
194
255
195
256
ssize_t sret = readlink(exe_link, exe_target, sizeof(exe_target));
196
257
free(exe_link);
197
if((sret != (ssize_t)sizeof(plymouth_path)-1) or
198
(memcmp(plymouth_path, exe_target,
199
sizeof(plymouth_path)-1) != 0)){
258
if((sret != (ssize_t)sizeof(plymouthd_path)-1) or
259
(memcmp(plymouthd_path, exe_target,
260
sizeof(plymouthd_path)-1) != 0)){
200
261
return 0;
201
262
}
202
263
return 1;
204
265
205
266
pid_t get_pid(void){
206
267
int ret;
268
uintmax_t proc_id = 0;
207
269
FILE *pidfile = fopen(plymouth_pid, "r");
208
uintmax_t maxvalue = 0;
270
/* Try the new pid file location */
209
271
if(pidfile != NULL){
210
ret = fscanf(pidfile, "%" SCNuMAX, &maxvalue);
272
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
211
273
if(ret != 1){
212
maxvalue = 0;
274
proc_id = 0;
213
275
}
214
276
fclose(pidfile);
215
277
}
216
if(maxvalue == 0){
217
struct dirent **direntries;
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;
218
292
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
219
sscanf(direntries[0]->d_name, "%" SCNuMAX, &maxvalue);
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);
220
305
}
221
306
pid_t pid;
222
pid = (pid_t)maxvalue;
223
if((uintmax_t)pid == maxvalue){
307
pid = (pid_t)proc_id;
308
if((uintmax_t)pid == proc_id){
224
309
return pid;
225
310
}
226
311
236
321
ret = asprintf(&cmdline_filename, "/proc/%" PRIuMAX "/cmdline",
237
322
(uintmax_t)pid);
238
323
if(ret == -1){
239
error(0, errno, "asprintf");
324
error_plus(0, errno, "asprintf");
240
325
return NULL;
241
326
}
242
327
244
329
cl_fd = open(cmdline_filename, O_RDONLY);
245
330
free(cmdline_filename);
246
331
if(cl_fd == -1){
247
error(0, errno, "open");
332
error_plus(0, errno, "open");
248
333
return NULL;
249
334
}
250
335
258
343
if(cmdline_len + blocksize > cmdline_allocated){
259
344
tmp = realloc(cmdline, cmdline_allocated + blocksize);
260
345
if(tmp == NULL){
261
error(0, errno, "realloc");
346
error_plus(0, errno, "realloc");
262
347
free(cmdline);
263
348
close(cl_fd);
264
349
return NULL;
271
356
sret = read(cl_fd, cmdline + cmdline_len,
272
357
cmdline_allocated - cmdline_len);
273
358
if(sret == -1){
274
error(0, errno, "read");
359
error_plus(0, errno, "read");
275
360
free(cmdline);
276
361
close(cl_fd);
277
362
return NULL;
280
365
} while(sret != 0);
281
366
ret = close(cl_fd);
282
367
if(ret == -1){
283
error(0, errno, "close");
368
error_plus(0, errno, "close");
284
369
free(cmdline);
285
370
return NULL;
286
371
}
287
372
288
373
/* we got cmdline and cmdline_len, ignore rest... */
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;
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;
301
380
}
302
argv[argv_size] = NULL;
303
return argv;
381
argz_extract(cmdline, cmdline_len, argv); /* Create argv */
382
return (const char **)argv;
304
383
}
305
384
306
385
int main(__attribute__((unused))int argc,
314
393
/* test -x /bin/plymouth */
315
394
ret = access(plymouth_path, X_OK);
316
395
if(ret == -1){
317
exit(EXIT_FAILURE);
396
/* Plymouth is probably not installed. Don't print an error
397
message, just exit. */
398
exit(EX_UNAVAILABLE);
318
399
}
319
400
320
401
{ /* Add signal handlers */
321
402
struct sigaction old_action,
322
403
new_action = { .sa_handler = termination_handler,
323
404
.sa_flags = 0 };
324
405
sigemptyset(&new_action.sa_mask);
325
for(int *sig = (int[]){ SIGINT, SIGHUP, SIGTERM, 0 }; *sig != 0; sig++){
406
for(int *sig = (int[]){ SIGINT, SIGHUP, SIGTERM, 0 };
407
*sig != 0; sig++){
326
408
ret = sigaddset(&new_action.sa_mask, *sig);
327
409
if(ret == -1){
328
error(0, errno, "sigaddset");
329
exit(EX_OSERR);
410
error_plus(EX_OSERR, errno, "sigaddset");
330
411
}
331
412
ret = sigaction(*sig, NULL, &old_action);
332
413
if(ret == -1){
333
error(0, errno, "sigaction");
334
exit(EX_OSERR);
414
error_plus(EX_OSERR, errno, "sigaction");
335
415
}
336
416
if(old_action.sa_handler != SIG_IGN){
337
417
ret = sigaction(*sig, &new_action, NULL);
338
418
if(ret == -1){
339
error(0, errno, "sigaction");
340
exit(EX_OSERR);
419
error_plus(EX_OSERR, errno, "sigaction");
341
420
}
342
421
}
343
422
}
344
423
}
345
424
346
425
/* plymouth --ping */
347
426
bret = exec_and_wait(&plymouth_command_pid, plymouth_path,
348
(const char *[]){ (const char *)plymouth_path, (const char *)"--ping", (const char *)NULL},
427
(const char *[])
428
{ plymouth_path, "--ping", NULL },
349
429
true, false);
350
430
if(not bret){
351
431
if(interrupted_by_signal){
352
432
kill_and_wait(plymouth_command_pid);
433
exit(EXIT_FAILURE);
353
434
}
354
exit(EXIT_FAILURE);
435
/* Plymouth is probably not running. Don't print an error
436
message, just exit. */
437
exit(EX_UNAVAILABLE);
355
438
}
356
439
357
440
prompt = makeprompt();
358
441
ret = asprintf(&prompt_arg, "--prompt=%s", prompt);
359
442
free(prompt);
360
443
if(ret == -1){
361
error(0, errno, "asprintf");
362
exit(EXIT_FAILURE);
444
error_plus(EX_OSERR, errno, "asprintf");
363
445
}
364
446
365
447
/* plymouth ask-for-password --prompt="$prompt" */
366
bret = exec_and_wait(&plymouth_command_pid, plymouth_path,
367
(const char *[]){plymouth_path, "ask-for-password", prompt_arg, NULL},
448
bret = exec_and_wait(&plymouth_command_pid,
449
plymouth_path, (const char *[])
450
{ plymouth_path, "ask-for-password",
451
prompt_arg, NULL },
368
452
true, false);
369
453
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
378
454
if(bret){
379
455
exit(EXIT_SUCCESS);
380
456
}
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);
381
462
382
const char **plymouthd_argv = NULL;
463
const char **plymouthd_argv;
383
464
pid_t pid = get_pid();
384
465
if(pid == 0){
385
error(0, 0, "plymouthd pid not found");
466
error_plus(0, 0, "plymouthd pid not found");
467
plymouthd_argv = plymouthd_default_argv;
386
468
} else {
387
469
plymouthd_argv = getargv(pid);
388
470
}
389
if(plymouthd_argv == NULL){
390
plymouthd_argv = plymouthd_default_argv;
391
}
392
471
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);
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);
404
486
exit(EXIT_FAILURE);
405
487
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0