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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 © 2010-2020 Teddy Hogeborn
6
* Copyright © 2010-2020 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 /* asprintf(), TEMP_FAILURE_RETRY() */
27
#include <signal.h> /* sig_atomic_t, struct sigaction,
28
sigemptyset(), sigaddset(), SIGINT,
29
SIGHUP, SIGTERM, sigaction(),
30
kill(), SIG_IGN */
31
#include <stdbool.h> /* bool, false, true */
32
#include <fcntl.h> /* open(), O_RDONLY */
33
#include <iso646.h> /* and, or, not*/
34
#include <sys/types.h> /* size_t, ssize_t, pid_t, struct
35
dirent, waitpid() */
36
#include <sys/wait.h> /* waitpid() */
37
#include <stddef.h> /* NULL */
38
#include <string.h> /* strchr(), memcmp() */
39
#include <stdio.h> /* asprintf(), perror(), fopen(),
40
fscanf(), vasprintf(), fprintf(),
41
vfprintf() */
42
#include <unistd.h> /* close(), readlink(), read(),
43
fork(), setsid(), chdir(), dup2(),
44
STDERR_FILENO, execv(), access() */
45
#include <stdlib.h> /* free(), EXIT_FAILURE, realloc(),
46
EXIT_SUCCESS, malloc(), _exit(),
47
getenv(), reallocarray() */
48
#include <dirent.h> /* scandir(), alphasort() */
49
#include <inttypes.h> /* intmax_t, strtoumax(), SCNuMAX */
50
#include <sys/stat.h> /* struct stat, lstat() */
51
#include <sysexits.h> /* EX_OSERR, EX_UNAVAILABLE */
52
#include <error.h> /* error() */
53
#include <errno.h> /* TEMP_FAILURE_RETRY */
54
#include <argz.h> /* argz_count(), argz_extract() */
55
#include <stdarg.h> /* va_list, va_start(), ... */
56
#include <argp.h>
57
58
sig_atomic_t interrupted_by_signal = 0;
59
const char *argp_program_version = "plymouth " VERSION;
60
const char *argp_program_bug_address = "<mandos@recompile.se>";
61
62
/* Used by Ubuntu 11.04 (Natty Narwahl) */
63
const char plymouth_old_old_pid[] = "/dev/.initramfs/plymouth.pid";
64
/* Used by Ubuntu 11.10 (Oneiric Ocelot) */
65
const char plymouth_old_pid[] = "/run/initramfs/plymouth.pid";
66
/* Used by Debian 9 (stretch) */
67
const char plymouth_pid[] = "/run/plymouth/pid";
68
69
const char plymouth_path[] = "/bin/plymouth";
70
const char plymouthd_path[] = "/sbin/plymouthd";
71
const char *plymouthd_default_argv[] = {"/sbin/plymouthd",
72
"--mode=boot",
73
"--attach-to-session",
74
NULL };
75
bool debug = false;
76
77
static void termination_handler(__attribute__((unused))int signum){
78
if(interrupted_by_signal){
79
return;
80
}
81
interrupted_by_signal = 1;
82
}
83
84
__attribute__((format (gnu_printf, 2, 3), nonnull))
85
int fprintf_plus(FILE *stream, const char *format, ...){
86
va_list ap;
87
va_start (ap, format);
88
fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name);
89
return vfprintf(stream, format, ap);
90
}
91
92
/* Function to use when printing errors */
93
__attribute__((format (gnu_printf, 3, 4)))
94
void error_plus(int status, int errnum, const char *formatstring,
95
...){
96
va_list ap;
97
char *text;
98
int ret;
99
100
va_start(ap, formatstring);
101
ret = vasprintf(&text, formatstring, ap);
102
if(ret == -1){
103
fprintf(stderr, "Mandos plugin %s: ",
104
program_invocation_short_name);
105
vfprintf(stderr, formatstring, ap);
106
fprintf(stderr, ": ");
107
fprintf(stderr, "%s\n", strerror(errnum));
108
error(status, errno, "vasprintf while printing error");
109
return;
110
}
111
fprintf(stderr, "Mandos plugin ");
112
error(status, errnum, "%s", text);
113
free(text);
114
}
115
116
/* Create prompt string */
117
char *makeprompt(void){
118
int ret = 0;
119
char *prompt;
120
const char *const cryptsource = getenv("cryptsource");
121
const char *const crypttarget = getenv("crypttarget");
122
const char prompt_start[] = "Unlocking the disk";
123
const char prompt_end[] = "Enter passphrase";
124
125
if(cryptsource == NULL){
126
if(crypttarget == NULL){
127
ret = asprintf(&prompt, "%s\n%s", prompt_start, prompt_end);
128
} else {
129
ret = asprintf(&prompt, "%s (%s)\n%s", prompt_start,
130
crypttarget, prompt_end);
131
}
132
} else {
133
if(crypttarget == NULL){
134
ret = asprintf(&prompt, "%s %s\n%s", prompt_start, cryptsource,
135
prompt_end);
136
} else {
137
ret = asprintf(&prompt, "%s %s (%s)\n%s", prompt_start,
138
cryptsource, crypttarget, prompt_end);
139
}
140
}
141
if(ret == -1){
142
return NULL;
143
}
144
return prompt;
145
}
146
147
void kill_and_wait(pid_t pid){
148
TEMP_FAILURE_RETRY(kill(pid, SIGTERM));
149
TEMP_FAILURE_RETRY(waitpid(pid, NULL, 0));
150
}
151
152
bool become_a_daemon(void){
153
int ret = setuid(geteuid());
154
if(ret == -1){
155
error_plus(0, errno, "setuid");
156
}
157
158
setsid();
159
ret = chdir("/");
160
if(ret == -1){
161
error_plus(0, errno, "chdir");
162
return false;
163
}
164
ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
165
if(ret == -1){
166
error_plus(0, errno, "dup2");
167
return false;
168
}
169
return true;
170
}
171
172
__attribute__((nonnull (2, 3)))
173
bool exec_and_wait(pid_t *pid_return, const char *path,
174
const char * const * const argv, bool interruptable,
175
bool daemonize){
176
int status;
177
int ret;
178
pid_t pid;
179
if(debug){
180
for(const char * const *arg = argv; *arg != NULL; arg++){
181
fprintf_plus(stderr, "exec_and_wait arg: %s\n", *arg);
182
}
183
fprintf_plus(stderr, "exec_and_wait end of args\n");
184
}
185
186
pid = fork();
187
if(pid == -1){
188
error_plus(0, errno, "fork");
189
return false;
190
}
191
if(pid == 0){
192
/* Child */
193
if(daemonize){
194
if(not become_a_daemon()){
195
_exit(EX_OSERR);
196
}
197
}
198
199
char **new_argv = malloc(sizeof(const char *));
200
if(new_argv == NULL){
201
error_plus(0, errno, "malloc");
202
_exit(EX_OSERR);
203
}
204
char **tmp;
205
int i = 0;
206
for (; argv[i] != NULL; i++){
207
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
208
tmp = reallocarray(new_argv, ((size_t)i + 2),
209
sizeof(const char *));
210
#else
211
if(((size_t)i + 2) > (SIZE_MAX / sizeof(const char *))){
212
/* overflow */
213
tmp = NULL;
214
errno = ENOMEM;
215
} else {
216
tmp = realloc(new_argv, ((size_t)i + 2) * sizeof(const char *));
217
}
218
#endif
219
if(tmp == NULL){
220
error_plus(0, errno, "reallocarray");
221
free(new_argv);
222
_exit(EX_OSERR);
223
}
224
new_argv = tmp;
225
new_argv[i] = strdup(argv[i]);
226
}
227
new_argv[i] = NULL;
228
229
execv(path, (char *const *)new_argv);
230
error_plus(0, errno, "execv");
231
_exit(EXIT_FAILURE);
232
}
233
if(pid_return != NULL){
234
*pid_return = pid;
235
}
236
do {
237
ret = waitpid(pid, &status, 0);
238
} while(ret == -1 and errno == EINTR
239
and ((not interrupted_by_signal)
240
or (not interruptable)));
241
if(interrupted_by_signal and interruptable){
242
if(debug){
243
fprintf_plus(stderr, "Interrupted by signal\n");
244
}
245
return false;
246
}
247
if(ret == -1){
248
error_plus(0, errno, "waitpid");
249
return false;
250
}
251
if(debug){
252
if(WIFEXITED(status)){
253
fprintf_plus(stderr, "exec_and_wait exited: %d\n",
254
WEXITSTATUS(status));
255
} else if(WIFSIGNALED(status)) {
256
fprintf_plus(stderr, "exec_and_wait signaled: %d\n",
257
WTERMSIG(status));
258
}
259
}
260
if(WIFEXITED(status) and (WEXITSTATUS(status) == 0)){
261
return true;
262
}
263
return false;
264
}
265
266
__attribute__((nonnull))
267
int is_plymouth(const struct dirent *proc_entry){
268
int ret;
269
{
270
uintmax_t proc_id;
271
char *tmp;
272
errno = 0;
273
proc_id = strtoumax(proc_entry->d_name, &tmp, 10);
274
275
if(errno != 0 or *tmp != '\0'
276
or proc_id != (uintmax_t)((pid_t)proc_id)){
277
return 0;
278
}
279
}
280
char exe_target[sizeof(plymouthd_path)];
281
char *exe_link;
282
ret = asprintf(&exe_link, "/proc/%s/exe", proc_entry->d_name);
283
if(ret == -1){
284
error_plus(0, errno, "asprintf");
285
return 0;
286
}
287
288
struct stat exe_stat;
289
ret = lstat(exe_link, &exe_stat);
290
if(ret == -1){
291
free(exe_link);
292
if(errno != ENOENT){
293
error_plus(0, errno, "lstat");
294
}
295
return 0;
296
}
297
298
if(not S_ISLNK(exe_stat.st_mode)
299
or exe_stat.st_uid != 0
300
or exe_stat.st_gid != 0){
301
free(exe_link);
302
return 0;
303
}
304
305
ssize_t sret = readlink(exe_link, exe_target, sizeof(exe_target));
306
free(exe_link);
307
if((sret != (ssize_t)sizeof(plymouthd_path)-1) or
308
(memcmp(plymouthd_path, exe_target,
309
sizeof(plymouthd_path)-1) != 0)){
310
return 0;
311
}
312
return 1;
313
}
314
315
pid_t get_pid(void){
316
int ret;
317
uintmax_t proc_id = 0;
318
FILE *pidfile = fopen(plymouth_pid, "r");
319
/* Try the new pid file location */
320
if(pidfile != NULL){
321
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
322
if(ret != 1){
323
proc_id = 0;
324
}
325
fclose(pidfile);
326
}
327
/* Try the old pid file location */
328
if(proc_id == 0){
329
pidfile = fopen(plymouth_old_pid, "r");
330
if(pidfile != NULL){
331
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
332
if(ret != 1){
333
proc_id = 0;
334
}
335
fclose(pidfile);
336
}
337
}
338
/* Try the old old pid file location */
339
if(proc_id == 0){
340
pidfile = fopen(plymouth_old_old_pid, "r");
341
if(pidfile != NULL){
342
ret = fscanf(pidfile, "%" SCNuMAX, &proc_id);
343
if(ret != 1){
344
proc_id = 0;
345
}
346
fclose(pidfile);
347
}
348
}
349
/* Look for a plymouth process */
350
if(proc_id == 0){
351
struct dirent **direntries = NULL;
352
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
353
if(ret == -1){
354
error_plus(0, errno, "scandir");
355
}
356
if(ret > 0){
357
for(int i = ret-1; i >= 0; i--){
358
if(proc_id == 0){
359
ret = sscanf(direntries[i]->d_name, "%" SCNuMAX, &proc_id);
360
if(ret < 0){
361
error_plus(0, errno, "sscanf");
362
}
363
}
364
free(direntries[i]);
365
}
366
}
367
/* scandir might preallocate for this variable (man page unclear).
368
even if ret == 0, therefore we need to free it. */
369
free(direntries);
370
}
371
pid_t pid;
372
pid = (pid_t)proc_id;
373
if((uintmax_t)pid == proc_id){
374
return pid;
375
}
376
377
return 0;
378
}
379
380
char **getargv(pid_t pid){
381
int cl_fd;
382
char *cmdline_filename;
383
ssize_t sret;
384
int ret;
385
386
ret = asprintf(&cmdline_filename, "/proc/%" PRIuMAX "/cmdline",
387
(uintmax_t)pid);
388
if(ret == -1){
389
error_plus(0, errno, "asprintf");
390
return NULL;
391
}
392
393
/* Open /proc/<pid>/cmdline */
394
cl_fd = open(cmdline_filename, O_RDONLY);
395
free(cmdline_filename);
396
if(cl_fd == -1){
397
error_plus(0, errno, "open");
398
return NULL;
399
}
400
401
size_t cmdline_allocated = 0;
402
size_t cmdline_len = 0;
403
char *cmdline = NULL;
404
char *tmp;
405
const size_t blocksize = 1024;
406
do {
407
/* Allocate more space? */
408
if(cmdline_len + blocksize > cmdline_allocated){
409
tmp = realloc(cmdline, cmdline_allocated + blocksize);
410
if(tmp == NULL){
411
error_plus(0, errno, "realloc");
412
free(cmdline);
413
close(cl_fd);
414
return NULL;
415
}
416
cmdline = tmp;
417
cmdline_allocated += blocksize;
418
}
419
420
/* Read data */
421
sret = read(cl_fd, cmdline + cmdline_len,
422
cmdline_allocated - cmdline_len);
423
if(sret == -1){
424
error_plus(0, errno, "read");
425
free(cmdline);
426
close(cl_fd);
427
return NULL;
428
}
429
cmdline_len += (size_t)sret;
430
} while(sret != 0);
431
ret = close(cl_fd);
432
if(ret == -1){
433
error_plus(0, errno, "close");
434
free(cmdline);
435
return NULL;
436
}
437
438
/* we got cmdline and cmdline_len, ignore rest... */
439
char **argv = malloc((argz_count(cmdline, cmdline_len) + 1)
440
* sizeof(char *)); /* Get number of args */
441
if(argv == NULL){
442
error_plus(0, errno, "argv = malloc()");
443
free(cmdline);
444
return NULL;
445
}
446
argz_extract(cmdline, cmdline_len, argv); /* Create argv */
447
return argv;
448
}
449
450
int main(__attribute__((unused))int argc,
451
__attribute__((unused))char **argv){
452
char *prompt = NULL;
453
char *prompt_arg;
454
pid_t plymouth_command_pid;
455
int ret;
456
bool bret;
457
458
{
459
struct argp_option options[] = {
460
{ .name = "prompt", .key = 128, .arg = "PROMPT",
461
.doc = "The prompt to show" },
462
{ .name = "debug", .key = 129,
463
.doc = "Debug mode" },
464
{ .name = NULL }
465
};
466
467
__attribute__((nonnull(3)))
468
error_t parse_opt (int key, char *arg, __attribute__((unused))
469
struct argp_state *state){
470
errno = 0;
471
switch (key){
472
case 128: /* --prompt */
473
prompt = arg;
474
if(debug){
475
fprintf_plus(stderr, "Custom prompt \"%s\"\n", prompt);
476
}
477
break;
478
case 129: /* --debug */
479
debug = true;
480
break;
481
default:
482
return ARGP_ERR_UNKNOWN;
483
}
484
return errno;
485
}
486
487
struct argp argp = { .options = options, .parser = parse_opt,
488
.args_doc = "",
489
.doc = "Mandos plymouth -- Read and"
490
" output a password" };
491
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, NULL, NULL);
492
switch(ret){
493
case 0:
494
break;
495
case ENOMEM:
496
default:
497
errno = ret;
498
error_plus(0, errno, "argp_parse");
499
return EX_OSERR;
500
case EINVAL:
501
error_plus(0, errno, "argp_parse");
502
return EX_USAGE;
503
}
504
}
505
506
/* test -x /bin/plymouth */
507
ret = access(plymouth_path, X_OK);
508
if(ret == -1){
509
/* Plymouth is probably not installed. Don't print an error
510
message, just exit. */
511
if(debug){
512
fprintf_plus(stderr, "Plymouth (%s) not found\n",
513
plymouth_path);
514
}
515
exit(EX_UNAVAILABLE);
516
}
517
518
{ /* Add signal handlers */
519
struct sigaction old_action,
520
new_action = { .sa_handler = termination_handler,
521
.sa_flags = 0 };
522
sigemptyset(&new_action.sa_mask);
523
for(int *sig = (int[]){ SIGINT, SIGHUP, SIGTERM, 0 };
524
*sig != 0; sig++){
525
ret = sigaddset(&new_action.sa_mask, *sig);
526
if(ret == -1){
527
error_plus(EX_OSERR, errno, "sigaddset");
528
}
529
ret = sigaction(*sig, NULL, &old_action);
530
if(ret == -1){
531
error_plus(EX_OSERR, errno, "sigaction");
532
}
533
if(old_action.sa_handler != SIG_IGN){
534
ret = sigaction(*sig, &new_action, NULL);
535
if(ret == -1){
536
error_plus(EX_OSERR, errno, "sigaction");
537
}
538
}
539
}
540
}
541
542
/* plymouth --ping */
543
bret = exec_and_wait(&plymouth_command_pid, plymouth_path,
544
(const char *[])
545
{ plymouth_path, "--ping", NULL },
546
true, false);
547
if(not bret){
548
if(interrupted_by_signal){
549
kill_and_wait(plymouth_command_pid);
550
exit(EXIT_FAILURE);
551
}
552
/* Plymouth is probably not running. Don't print an error
553
message, just exit. */
554
if(debug){
555
fprintf_plus(stderr, "Plymouth not running\n");
556
}
557
exit(EX_UNAVAILABLE);
558
}
559
560
if(prompt != NULL){
561
ret = asprintf(&prompt_arg, "--prompt=%s", prompt);
562
} else {
563
char *made_prompt = makeprompt();
564
ret = asprintf(&prompt_arg, "--prompt=%s", made_prompt);
565
free(made_prompt);
566
}
567
if(ret == -1){
568
error_plus(EX_OSERR, errno, "asprintf");
569
}
570
571
/* plymouth ask-for-password --prompt="$prompt" */
572
if(debug){
573
fprintf_plus(stderr, "Prompting for password via Plymouth\n");
574
}
575
bret = exec_and_wait(&plymouth_command_pid,
576
plymouth_path, (const char *[])
577
{ plymouth_path, "ask-for-password",
578
prompt_arg, NULL },
579
true, false);
580
free(prompt_arg);
581
if(bret){
582
exit(EXIT_SUCCESS);
583
}
584
if(not interrupted_by_signal){
585
/* exec_and_wait failed for some other reason */
586
exit(EXIT_FAILURE);
587
}
588
kill_and_wait(plymouth_command_pid);
589
590
char **plymouthd_argv = NULL;
591
pid_t pid = get_pid();
592
if(pid == 0){
593
error_plus(0, 0, "plymouthd pid not found");
594
} else {
595
plymouthd_argv = getargv(pid);
596
}
597
598
bret = exec_and_wait(NULL, plymouth_path, (const char *[])
599
{ plymouth_path, "quit", NULL },
600
false, false);
601
if(not bret){
602
if(plymouthd_argv != NULL){
603
free(*plymouthd_argv);
604
free(plymouthd_argv);
605
}
606
exit(EXIT_FAILURE);
607
}
608
bret = exec_and_wait(NULL, plymouthd_path,
609
(plymouthd_argv != NULL)
610
? (const char * const *)plymouthd_argv
611
: plymouthd_default_argv,
612
false, true);
613
if(plymouthd_argv != NULL){
614
free(*plymouthd_argv);
615
free(plymouthd_argv);
616
}
617
if(not bret){
618
exit(EXIT_FAILURE);
619
}
620
exec_and_wait(NULL, plymouth_path, (const char *[])
621
{ plymouth_path, "show-splash", NULL },
622
false, false);
623
exit(EXIT_FAILURE);
624
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0