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- 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 © 2010-2021 Teddy Hogeborn
6
* Copyright © 2010-2021 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
for(int i = ret-1; i >= 0; i--){
376
if(proc_id == 0){
377
ret = sscanf(direntries[i]->d_name, "%" SCNuMAX, &proc_id);
378
if(ret < 0){
379
error_plus(0, errno, "sscanf");
380
}
381
}
382
free(direntries[i]);
383
}
384
}
385
/* scandir might preallocate for this variable (man page unclear).
386
even if ret == 0, therefore we need to free it. */
387
free(direntries);
388
}
389
pid_t pid;
390
pid = (pid_t)proc_id;
391
if((uintmax_t)pid == proc_id){
392
return pid;
393
}
394
395
return 0;
396
}
397
398
char **getargv(pid_t pid){
399
int cl_fd;
400
char *cmdline_filename;
401
ssize_t sret;
402
int ret;
403
404
ret = asprintf(&cmdline_filename, "/proc/%" PRIuMAX "/cmdline",
405
(uintmax_t)pid);
406
if(ret == -1){
407
error_plus(0, errno, "asprintf");
408
return NULL;
409
}
410
411
/* Open /proc/<pid>/cmdline */
412
cl_fd = open(cmdline_filename, O_RDONLY);
413
free(cmdline_filename);
414
if(cl_fd == -1){
415
error_plus(0, errno, "open");
416
return NULL;
417
}
418
419
size_t cmdline_allocated = 0;
420
size_t cmdline_len = 0;
421
char *cmdline = NULL;
422
char *tmp;
423
const size_t blocksize = 1024;
424
do {
425
/* Allocate more space? */
426
if(cmdline_len + blocksize > cmdline_allocated){
427
tmp = realloc(cmdline, cmdline_allocated + blocksize);
428
if(tmp == NULL){
429
error_plus(0, errno, "realloc");
430
free(cmdline);
431
close(cl_fd);
432
return NULL;
433
}
434
cmdline = tmp;
435
cmdline_allocated += blocksize;
436
}
437
438
/* Read data */
439
sret = read(cl_fd, cmdline + cmdline_len,
440
cmdline_allocated - cmdline_len);
441
if(sret == -1){
442
error_plus(0, errno, "read");
443
free(cmdline);
444
close(cl_fd);
445
return NULL;
446
}
447
cmdline_len += (size_t)sret;
448
} while(sret != 0);
449
ret = close(cl_fd);
450
if(ret == -1){
451
error_plus(0, errno, "close");
452
free(cmdline);
453
return NULL;
454
}
455
456
/* we got cmdline and cmdline_len, ignore rest... */
457
char **argv = malloc((argz_count(cmdline, cmdline_len) + 1)
458
* sizeof(char *)); /* Get number of args */
459
if(argv == NULL){
460
error_plus(0, errno, "argv = malloc()");
461
free(cmdline);
462
return NULL;
463
}
464
argz_extract(cmdline, cmdline_len, argv); /* Create argv */
465
return argv;
466
}
467
468
int main(__attribute__((unused))int argc,
469
__attribute__((unused))char **argv){
470
char *prompt = NULL;
471
char *prompt_arg;
472
pid_t plymouth_command_pid;
473
int ret;
474
bool bret;
475
476
{
477
struct argp_option options[] = {
478
{ .name = "prompt", .key = 128, .arg = "PROMPT",
479
.doc = "The prompt to show" },
480
{ .name = "debug", .key = 129,
481
.doc = "Debug mode" },
482
{ .name = NULL }
483
};
484
485
__attribute__((nonnull(3)))
486
error_t parse_opt (int key, char *arg, __attribute__((unused))
487
struct argp_state *state){
488
errno = 0;
489
switch (key){
490
case 128: /* --prompt */
491
prompt = arg;
492
if(debug){
493
fprintf_plus(stderr, "Custom prompt \"%s\"\n", prompt);
494
}
495
break;
496
case 129: /* --debug */
497
debug = true;
498
break;
499
default:
500
return ARGP_ERR_UNKNOWN;
501
}
502
return errno;
503
}
504
505
struct argp argp = { .options = options, .parser = parse_opt,
506
.args_doc = "",
507
.doc = "Mandos plymouth -- Read and"
508
" output a password" };
509
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, NULL, NULL);
510
switch(ret){
511
case 0:
512
break;
513
case ENOMEM:
514
default:
515
errno = ret;
516
error_plus(0, errno, "argp_parse");
517
return EX_OSERR;
518
case EINVAL:
519
error_plus(0, errno, "argp_parse");
520
return EX_USAGE;
521
}
522
}
523
524
/* test -x /bin/plymouth */
525
ret = access(plymouth_path, X_OK);
526
if(ret == -1){
527
/* Plymouth is probably not installed. Don't print an error
528
message, just exit. */
529
if(debug){
530
fprintf_plus(stderr, "Plymouth (%s) not found\n",
531
plymouth_path);
532
}
533
exit(EX_UNAVAILABLE);
534
}
535
536
{ /* Add signal handlers */
537
struct sigaction old_action,
538
new_action = { .sa_handler = termination_handler,
539
.sa_flags = 0 };
540
sigemptyset(&new_action.sa_mask);
541
for(int *sig = (int[]){ SIGINT, SIGHUP, SIGTERM, 0 };
542
*sig != 0; sig++){
543
ret = sigaddset(&new_action.sa_mask, *sig);
544
if(ret == -1){
545
error_plus(EX_OSERR, errno, "sigaddset");
546
}
547
ret = sigaction(*sig, NULL, &old_action);
548
if(ret == -1){
549
error_plus(EX_OSERR, errno, "sigaction");
550
}
551
if(old_action.sa_handler != SIG_IGN){
552
ret = sigaction(*sig, &new_action, NULL);
553
if(ret == -1){
554
error_plus(EX_OSERR, errno, "sigaction");
555
}
556
}
557
}
558
}
559
560
/* plymouth --ping */
561
bret = exec_and_wait(&plymouth_command_pid, plymouth_path,
562
(const char *[])
563
{ plymouth_path, "--ping", NULL },
564
true, false);
565
if(not bret){
566
if(interrupted_by_signal){
567
kill_and_wait(plymouth_command_pid);
568
exit(EXIT_FAILURE);
569
}
570
/* Plymouth is probably not running. Don't print an error
571
message, just exit. */
572
if(debug){
573
fprintf_plus(stderr, "Plymouth not running\n");
574
}
575
exit(EX_UNAVAILABLE);
576
}
577
578
if(prompt != NULL){
579
ret = asprintf(&prompt_arg, "--prompt=%s", prompt);
580
} else {
581
char *made_prompt = makeprompt();
582
ret = asprintf(&prompt_arg, "--prompt=%s", made_prompt);
583
free(made_prompt);
584
}
585
if(ret == -1){
586
error_plus(EX_OSERR, errno, "asprintf");
587
}
588
589
/* plymouth ask-for-password --prompt="$prompt" */
590
if(debug){
591
fprintf_plus(stderr, "Prompting for password via Plymouth\n");
592
}
593
bret = exec_and_wait(&plymouth_command_pid,
594
plymouth_path, (const char *[])
595
{ plymouth_path, "ask-for-password",
596
prompt_arg, NULL },
597
true, false);
598
free(prompt_arg);
599
if(bret){
600
exit(EXIT_SUCCESS);
601
}
602
if(not interrupted_by_signal){
603
/* exec_and_wait failed for some other reason */
604
exit(EXIT_FAILURE);
605
}
606
kill_and_wait(plymouth_command_pid);
607
608
char **plymouthd_argv = NULL;
609
pid_t pid = get_pid();
610
if(pid == 0){
611
error_plus(0, 0, "plymouthd pid not found");
612
} else {
613
plymouthd_argv = getargv(pid);
614
}
615
616
bret = exec_and_wait(NULL, plymouth_path, (const char *[])
617
{ plymouth_path, "quit", NULL },
618
false, false);
619
if(not bret){
620
if(plymouthd_argv != NULL){
621
free(*plymouthd_argv);
622
free(plymouthd_argv);
623
}
624
exit(EXIT_FAILURE);
625
}
626
bret = exec_and_wait(NULL, plymouthd_path,
627
(plymouthd_argv != NULL)
628
? (const char * const *)plymouthd_argv
629
: plymouthd_default_argv,
630
false, true);
631
if(plymouthd_argv != NULL){
632
free(*plymouthd_argv);
633
free(plymouthd_argv);
634
}
635
if(not bret){
636
exit(EXIT_FAILURE);
637
}
638
exec_and_wait(NULL, plymouth_path, (const char *[])
639
{ plymouth_path, "show-splash", NULL },
640
false, false);
641
exit(EXIT_FAILURE);
642
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0