To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/plymouth.c
- browse files at revision 13
- compare with another revision
- download diff
- download tarball
- view history from revision 13
- Committer: Björn Påhlsson
- Date: 2008-07-20 02:52:20 UTC
- Revision ID: belorn@braxen-20080720025220-r5u0388uy9iu23h6
Added following support:
Pluginbased client handler
rewritten Mandos client
Avahi instead of udp server discovery
openpgp encrypted key support
Passprompt stand alone application for direct console input
Added logging for Mandos server
Pluginbased client handler
rewritten Mandos client
Avahi instead of udp server discovery
openpgp encrypted key support
Passprompt stand alone application for direct console input
Added logging for Mandos server
- files added:
- ca.pem
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files renamed:
- clients.conf => mandos-clients.conf
- plugin-runner.c => plugbasedclient.c
- plugins.d/mandos-client.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos => server.py
- files modified:
- Makefile
added
removed
plugins.d/plymouth.c
1
/* -*- coding: utf-8 -*- */
2
/*
3
* Plymouth - Read a password from Plymouth and output it
4
*
5
* Copyright © 2010-2022 Teddy Hogeborn
6
* Copyright © 2010-2022 Björn Påhlsson
7
*
8
* This file is part of Mandos.
9
*
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.
14
*
15
* Mandos is distributed in the hope that it will be useful, but
16
* WITHOUT ANY WARRANTY; without even the implied warranty of
17
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18
* General Public License for more details.
19
*
20
* You should have received a copy of the GNU General Public License
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
22
*
23
* Contact the authors at <mandos@recompile.se>.
24
*/
25
26
#define _GNU_SOURCE /* program_invocation_short_name,
27
vasprintf(), asprintf(),
28
TEMP_FAILURE_RETRY() */
29
#include <sys/types.h> /* sig_atomic_t, pid_t, setuid(),
30
geteuid(), setsid() */
31
#include <argp.h> /* argp_program_version,
32
argp_program_bug_address,
33
struct argp_option,
34
struct argp_state,
35
ARGP_ERR_UNKNOWN, struct argp,
36
argp_parse(), ARGP_IN_ORDER */
37
#include <stddef.h> /* NULL, size_t */
38
#include <stdbool.h> /* bool, false, true */
39
#include <stdio.h> /* FILE, fprintf(), vfprintf(),
40
vasprintf(), stderr, asprintf(),
41
fopen(), fscanf(), fclose(),
42
sscanf() */
43
#include <stdarg.h> /* va_list, va_start(), vfprintf() */
44
#include <errno.h> /* program_invocation_short_name,
45
errno, ENOMEM, EINTR, ENOENT,
46
error_t, EINVAL */
47
#include <string.h> /* strerror(), strdup(), memcmp() */
48
#include <error.h> /* error() */
49
#include <stdlib.h> /* free(), getenv(), malloc(),
50
reallocarray(), realloc(),
51
EXIT_FAILURE, EXIT_SUCCESS */
52
#include <unistd.h> /* TEMP_FAILURE_RETRY(), setuid(),
53
geteuid(), setsid(), chdir(),
54
dup2(), STDERR_FILENO,
55
STDOUT_FILENO, fork(), _exit(),
56
execv(), ssize_t, readlink(),
57
close(), read(), access(), X_OK */
58
#include <signal.h> /* kill(), SIGTERM, struct sigaction,
59
sigemptyset(), SIGINT, SIGHUP,
60
sigaddset(), SIG_IGN */
61
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
62
WEXITSTATUS(), WIFSIGNALED(),
63
WTERMSIG() */
64
#include <iso646.h> /* not, and, or */
65
#include <sysexits.h> /* EX_OSERR, EX_USAGE,
66
EX_UNAVAILABLE */
67
#include <stdint.h> /* SIZE_MAX */
68
#include <dirent.h> /* struct dirent, scandir(),
69
alphasort() */
70
#include <inttypes.h> /* uintmax_t, strtoumax(), SCNuMAX,
71
PRIuMAX */
72
#include <sys/stat.h> /* struct stat, lstat(), S_ISLNK() */
73
#include <fcntl.h> /* open(), O_RDONLY */
74
#include <argz.h> /* argz_count(), argz_extract() */
75
76
sig_atomic_t interrupted_by_signal = 0;
77
const char *argp_program_version = "plymouth " VERSION;
78
const char *argp_program_bug_address = "<mandos@recompile.se>";
79
80
/* Used by Ubuntu 11.04 (Natty Narwahl) */
81
const char plymouth_old_old_pid[] = "/dev/.initramfs/plymouth.pid";
82
/* Used by Ubuntu 11.10 (Oneiric Ocelot) */
83
const char plymouth_old_pid[] = "/run/initramfs/plymouth.pid";
84
/* Used by Debian 9 (stretch) */
85
const char plymouth_pid[] = "/run/plymouth/pid";
86
87
const char plymouth_path[] = "/bin/plymouth";
88
const char plymouthd_path[] = "/sbin/plymouthd";
89
const char *plymouthd_default_argv[] = {"/sbin/plymouthd",
90
"--mode=boot",
91
"--attach-to-session",
92
NULL };
93
bool debug = false;
94
95
static void termination_handler(__attribute__((unused))int signum){
96
if(interrupted_by_signal){
97
return;
98
}
99
interrupted_by_signal = 1;
100
}
101
102
__attribute__((format (gnu_printf, 2, 3), nonnull))
103
int fprintf_plus(FILE *stream, const char *format, ...){
104
va_list ap;
105
va_start (ap, format);
106
fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name);
107
return vfprintf(stream, format, ap);
108
}
109
110
/* Function to use when printing errors */
111
__attribute__((format (gnu_printf, 3, 4)))
112
void error_plus(int status, int errnum, const char *formatstring,
113
...){
114
va_list ap;
115
char *text;
116
int ret;
117
118
va_start(ap, formatstring);
119
ret = vasprintf(&text, formatstring, ap);
120
if(ret == -1){
121
fprintf(stderr, "Mandos plugin %s: ",
122
program_invocation_short_name);
123
vfprintf(stderr, formatstring, ap);
124
fprintf(stderr, ": ");
125
fprintf(stderr, "%s\n", strerror(errnum));
126
error(status, errno, "vasprintf while printing error");
127
return;
128
}
129
fprintf(stderr, "Mandos plugin ");
130
error(status, errnum, "%s", text);
131
free(text);
132
}
133
134
/* Create prompt string */
135
char *makeprompt(void){
136
int ret = 0;
137
char *prompt;
138
const char *const cryptsource = getenv("cryptsource");
139
const char *const crypttarget = getenv("crypttarget");
140
const char prompt_start[] = "Unlocking the disk";
141
const char prompt_end[] = "Enter passphrase";
142
143
if(cryptsource == NULL){
144
if(crypttarget == NULL){
145
ret = asprintf(&prompt, "%s\n%s", prompt_start, prompt_end);
146
} else {
147
ret = asprintf(&prompt, "%s (%s)\n%s", prompt_start,
148
crypttarget, prompt_end);
149
}
150
} else {
151
if(crypttarget == NULL){
152
ret = asprintf(&prompt, "%s %s\n%s", prompt_start, cryptsource,
153
prompt_end);
154
} else {
155
ret = asprintf(&prompt, "%s %s (%s)\n%s", prompt_start,
156
cryptsource, crypttarget, prompt_end);
157
}
158
}
159
if(ret == -1){
160
return NULL;
161
}
162
return prompt;
163
}
164
165
void kill_and_wait(pid_t pid){
166
TEMP_FAILURE_RETRY(kill(pid, SIGTERM));
167
TEMP_FAILURE_RETRY(waitpid(pid, NULL, 0));
168
}
169
170
bool become_a_daemon(void){
171
int ret = setuid(geteuid());
172
if(ret == -1){
173
error_plus(0, errno, "setuid");
174
}
175
176
setsid();
177
ret = chdir("/");
178
if(ret == -1){
179
error_plus(0, errno, "chdir");
180
return false;
181
}
182
ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
183
if(ret == -1){
184
error_plus(0, errno, "dup2");
185
return false;
186
}
187
return true;
188
}
189
190
__attribute__((nonnull (2, 3)))
191
bool exec_and_wait(pid_t *pid_return, const char *path,
192
const char * const * const argv, bool interruptable,
193
bool daemonize){
194
int status;
195
int ret;
196
pid_t pid;
197
if(debug){
198
for(const char * const *arg = argv; *arg != NULL; arg++){
199
fprintf_plus(stderr, "exec_and_wait arg: %s\n", *arg);
200
}
201
fprintf_plus(stderr, "exec_and_wait end of args\n");
202
}
203
204
pid = fork();
205
if(pid == -1){
206
error_plus(0, errno, "fork");
207
return false;
208
}
209
if(pid == 0){
210
/* Child */
211
if(daemonize){
212
if(not become_a_daemon()){
213
_exit(EX_OSERR);
214
}
215
}
216
217
char **new_argv = malloc(sizeof(const char *));
218
if(new_argv == NULL){
219
error_plus(0, errno, "malloc");
220
_exit(EX_OSERR);
221
}
222
char **tmp;
223
int i = 0;
224
for (; argv[i] != NULL; i++){
225
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
226
tmp = reallocarray(new_argv, ((size_t)i + 2),
227
sizeof(const char *));
228
#else
229
if(((size_t)i + 2) > (SIZE_MAX / sizeof(const char *))){
230
/* overflow */
231
tmp = NULL;
232
errno = ENOMEM;
233
} else {
234
tmp = realloc(new_argv, ((size_t)i + 2) * sizeof(const char *));
235
}
236
#endif
237
if(tmp == NULL){
238
error_plus(0, errno, "reallocarray");
239
free(new_argv);
240
_exit(EX_OSERR);
241
}
242
new_argv = tmp;
243
new_argv[i] = strdup(argv[i]);
244
}
245
new_argv[i] = NULL;
246
247
execv(path, (char *const *)new_argv);
248
error_plus(0, errno, "execv");
249
_exit(EXIT_FAILURE);
250
}
251
if(pid_return != NULL){
252
*pid_return = pid;
253
}
254
do {
255
ret = waitpid(pid, &status, 0);
256
} while(ret == -1 and errno == EINTR
257
and ((not interrupted_by_signal)
258
or (not interruptable)));
259
if(interrupted_by_signal and interruptable){
260
if(debug){
261
fprintf_plus(stderr, "Interrupted by signal\n");
262
}
263
return false;
264
}
265
if(ret == -1){
266
error_plus(0, errno, "waitpid");
267
return false;
268
}
269
if(debug){
270
if(WIFEXITED(status)){
271
fprintf_plus(stderr, "exec_and_wait exited: %d\n",
272
WEXITSTATUS(status));
273
} else if(WIFSIGNALED(status)) {
274
fprintf_plus(stderr, "exec_and_wait signaled: %d\n",
275
WTERMSIG(status));
276
}
277
}
278
if(WIFEXITED(status) and (WEXITSTATUS(status) == 0)){
279
return true;
280
}
281
return false;
282
}
283
284
__attribute__((nonnull))
285
int is_plymouth(const struct dirent *proc_entry){
286
int ret;
287
{
288
uintmax_t proc_id;
289
char *tmp;
290
errno = 0;
291
proc_id = strtoumax(proc_entry->d_name, &tmp, 10);
292
293
if(errno != 0 or *tmp != '\0'
294
or proc_id != (uintmax_t)((pid_t)proc_id)){
295
return 0;
296
}
297
}
298
char exe_target[sizeof(plymouthd_path)];
299
char *exe_link;
300
ret = asprintf(&exe_link, "/proc/%s/exe", proc_entry->d_name);
301
if(ret == -1){
302
error_plus(0, errno, "asprintf");
303
return 0;
304
}
305
306
struct stat exe_stat;
307
ret = lstat(exe_link, &exe_stat);
308
if(ret == -1){
309
free(exe_link);
310
if(errno != ENOENT){
311
error_plus(0, errno, "lstat");
312
}
313
return 0;
314
}
315
316
if(not S_ISLNK(exe_stat.st_mode)
317
or exe_stat.st_uid != 0
318
or exe_stat.st_gid != 0){
319
free(exe_link);
320
return 0;
321
}
322
323
ssize_t sret = readlink(exe_link, exe_target, sizeof(exe_target));
324
free(exe_link);
325
if((sret != (ssize_t)sizeof(plymouthd_path)-1) or
326
(memcmp(plymouthd_path, exe_target,
327
sizeof(plymouthd_path)-1) != 0)){
328
return 0;
329
}
330
return 1;
331
}
332
333
pid_t get_pid(void){
334
int ret;
335
uintmax_t proc_id = 0;
336
FILE *pidfile = fopen(plymouth_pid, "r");
337
/* Try the new pid file location */
338
if(pidfile != NULL){
339
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
340
if(ret != 1){
341
proc_id = 0;
342
}
343
fclose(pidfile);
344
}
345
/* Try the old pid file location */
346
if(proc_id == 0){
347
pidfile = fopen(plymouth_old_pid, "r");
348
if(pidfile != NULL){
349
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
350
if(ret != 1){
351
proc_id = 0;
352
}
353
fclose(pidfile);
354
}
355
}
356
/* Try the old old pid file location */
357
if(proc_id == 0){
358
pidfile = fopen(plymouth_old_old_pid, "r");
359
if(pidfile != NULL){
360
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
361
if(ret != 1){
362
proc_id = 0;
363
}
364
fclose(pidfile);
365
}
366
}
367
/* Look for a plymouth process */
368
if(proc_id == 0){
369
struct dirent **direntries = NULL;
370
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
371
if(ret == -1){
372
error_plus(0, errno, "scandir");
373
}
374
if(ret > 0){
375
const int num_entries = ret;
376
for(int i = 0; i < num_entries; i++){
377
if(proc_id == 0){
378
ret = sscanf(direntries[i]->d_name, "%" SCNuMAX, &proc_id);
379
if(ret < 0){
380
error_plus(0, errno, "sscanf");
381
}
382
}
383
free(direntries[i]);
384
}
385
}
386
/* scandir might preallocate for this variable (man page unclear).
387
even if ret == 0, therefore we need to free it. */
388
free(direntries);
389
}
390
pid_t pid;
391
pid = (pid_t)proc_id;
392
if((uintmax_t)pid == proc_id){
393
return pid;
394
}
395
396
return 0;
397
}
398
399
char **getargv(pid_t pid){
400
int cl_fd;
401
char *cmdline_filename;
402
ssize_t sret;
403
int ret;
404
405
ret = asprintf(&cmdline_filename, "/proc/%" PRIuMAX "/cmdline",
406
(uintmax_t)pid);
407
if(ret == -1){
408
error_plus(0, errno, "asprintf");
409
return NULL;
410
}
411
412
/* Open /proc/<pid>/cmdline */
413
cl_fd = open(cmdline_filename, O_RDONLY);
414
free(cmdline_filename);
415
if(cl_fd == -1){
416
error_plus(0, errno, "open");
417
return NULL;
418
}
419
420
size_t cmdline_allocated = 0;
421
size_t cmdline_len = 0;
422
char *cmdline = NULL;
423
char *tmp;
424
const size_t blocksize = 1024;
425
do {
426
/* Allocate more space? */
427
if(cmdline_len + blocksize > cmdline_allocated){
428
tmp = realloc(cmdline, cmdline_allocated + blocksize);
429
if(tmp == NULL){
430
error_plus(0, errno, "realloc");
431
free(cmdline);
432
close(cl_fd);
433
return NULL;
434
}
435
cmdline = tmp;
436
cmdline_allocated += blocksize;
437
}
438
439
/* Read data */
440
sret = read(cl_fd, cmdline + cmdline_len,
441
cmdline_allocated - cmdline_len);
442
if(sret == -1){
443
error_plus(0, errno, "read");
444
free(cmdline);
445
close(cl_fd);
446
return NULL;
447
}
448
cmdline_len += (size_t)sret;
449
} while(sret != 0);
450
ret = close(cl_fd);
451
if(ret == -1){
452
error_plus(0, errno, "close");
453
free(cmdline);
454
return NULL;
455
}
456
457
/* we got cmdline and cmdline_len, ignore rest... */
458
char **argv = malloc((argz_count(cmdline, cmdline_len) + 1)
459
* sizeof(char *)); /* Get number of args */
460
if(argv == NULL){
461
error_plus(0, errno, "argv = malloc()");
462
free(cmdline);
463
return NULL;
464
}
465
argz_extract(cmdline, cmdline_len, argv); /* Create argv */
466
return argv;
467
}
468
469
int main(__attribute__((unused))int argc,
470
__attribute__((unused))char **argv){
471
char *prompt = NULL;
472
char *prompt_arg;
473
pid_t plymouth_command_pid;
474
int ret;
475
bool bret;
476
477
{
478
struct argp_option options[] = {
479
{ .name = "prompt", .key = 128, .arg = "PROMPT",
480
.doc = "The prompt to show" },
481
{ .name = "debug", .key = 129,
482
.doc = "Debug mode" },
483
{ .name = NULL }
484
};
485
486
__attribute__((nonnull(3)))
487
error_t parse_opt (int key, char *arg, __attribute__((unused))
488
struct argp_state *state){
489
errno = 0;
490
switch (key){
491
case 128: /* --prompt */
492
prompt = arg;
493
if(debug){
494
fprintf_plus(stderr, "Custom prompt \"%s\"\n", prompt);
495
}
496
break;
497
case 129: /* --debug */
498
debug = true;
499
break;
500
default:
501
return ARGP_ERR_UNKNOWN;
502
}
503
return errno;
504
}
505
506
struct argp argp = { .options = options, .parser = parse_opt,
507
.args_doc = "",
508
.doc = "Mandos plymouth -- Read and"
509
" output a password" };
510
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, NULL, NULL);
511
switch(ret){
512
case 0:
513
break;
514
case ENOMEM:
515
default:
516
errno = ret;
517
error_plus(0, errno, "argp_parse");
518
return EX_OSERR;
519
case EINVAL:
520
error_plus(0, errno, "argp_parse");
521
return EX_USAGE;
522
}
523
}
524
525
/* test -x /bin/plymouth */
526
ret = access(plymouth_path, X_OK);
527
if(ret == -1){
528
/* Plymouth is probably not installed. Don't print an error
529
message, just exit. */
530
if(debug){
531
fprintf_plus(stderr, "Plymouth (%s) not found\n",
532
plymouth_path);
533
}
534
exit(EX_UNAVAILABLE);
535
}
536
537
{ /* Add signal handlers */
538
struct sigaction old_action,
539
new_action = { .sa_handler = termination_handler,
540
.sa_flags = 0 };
541
sigemptyset(&new_action.sa_mask);
542
for(int *sig = (int[]){ SIGINT, SIGHUP, SIGTERM, 0 };
543
*sig != 0; sig++){
544
ret = sigaddset(&new_action.sa_mask, *sig);
545
if(ret == -1){
546
error_plus(EX_OSERR, errno, "sigaddset");
547
}
548
ret = sigaction(*sig, NULL, &old_action);
549
if(ret == -1){
550
error_plus(EX_OSERR, errno, "sigaction");
551
}
552
if(old_action.sa_handler != SIG_IGN){
553
ret = sigaction(*sig, &new_action, NULL);
554
if(ret == -1){
555
error_plus(EX_OSERR, errno, "sigaction");
556
}
557
}
558
}
559
}
560
561
/* plymouth --ping */
562
bret = exec_and_wait(&plymouth_command_pid, plymouth_path,
563
(const char *[])
564
{ plymouth_path, "--ping", NULL },
565
true, false);
566
if(not bret){
567
if(interrupted_by_signal){
568
kill_and_wait(plymouth_command_pid);
569
exit(EXIT_FAILURE);
570
}
571
/* Plymouth is probably not running. Don't print an error
572
message, just exit. */
573
if(debug){
574
fprintf_plus(stderr, "Plymouth not running\n");
575
}
576
exit(EX_UNAVAILABLE);
577
}
578
579
if(prompt != NULL){
580
ret = asprintf(&prompt_arg, "--prompt=%s", prompt);
581
} else {
582
char *made_prompt = makeprompt();
583
ret = asprintf(&prompt_arg, "--prompt=%s", made_prompt);
584
free(made_prompt);
585
}
586
if(ret == -1){
587
error_plus(EX_OSERR, errno, "asprintf");
588
}
589
590
/* plymouth ask-for-password --prompt="$prompt" */
591
if(debug){
592
fprintf_plus(stderr, "Prompting for password via Plymouth\n");
593
}
594
bret = exec_and_wait(&plymouth_command_pid,
595
plymouth_path, (const char *[])
596
{ plymouth_path, "ask-for-password",
597
prompt_arg, NULL },
598
true, false);
599
free(prompt_arg);
600
if(bret){
601
exit(EXIT_SUCCESS);
602
}
603
if(not interrupted_by_signal){
604
/* exec_and_wait failed for some other reason */
605
exit(EXIT_FAILURE);
606
}
607
kill_and_wait(plymouth_command_pid);
608
609
char **plymouthd_argv = NULL;
610
pid_t pid = get_pid();
611
if(pid == 0){
612
error_plus(0, 0, "plymouthd pid not found");
613
} else {
614
plymouthd_argv = getargv(pid);
615
}
616
617
bret = exec_and_wait(NULL, plymouth_path, (const char *[])
618
{ plymouth_path, "quit", NULL },
619
false, false);
620
if(not bret){
621
if(plymouthd_argv != NULL){
622
free(*plymouthd_argv);
623
free(plymouthd_argv);
624
}
625
exit(EXIT_FAILURE);
626
}
627
bret = exec_and_wait(NULL, plymouthd_path,
628
(plymouthd_argv != NULL)
629
? (const char * const *)plymouthd_argv
630
: plymouthd_default_argv,
631
false, true);
632
if(plymouthd_argv != NULL){
633
free(*plymouthd_argv);
634
free(plymouthd_argv);
635
}
636
if(not bret){
637
exit(EXIT_FAILURE);
638
}
639
exec_and_wait(NULL, plymouth_path, (const char *[])
640
{ plymouth_path, "show-splash", NULL },
641
false, false);
642
exit(EXIT_FAILURE);
643
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0