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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
- 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/usplash.c
1
/* -*- coding: utf-8 -*- */
2
/*
3
* Passprompt - Read a password from usplash and output it
4
*
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 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 <https://www.fukt.bsnet.se/~belorn/> and
23
* <https://www.fukt.bsnet.se/~teddy/>.
24
*/
25
26
#define _GNU_SOURCE /* asprintf() */
27
#include <signal.h> /* sig_atomic_t, struct sigaction,
28
sigemptyset(), sigaddset(), SIGINT,
29
SIGHUP, SIGTERM, sigaction(),
30
SIG_IGN, kill(), SIGKILL */
31
#include <stdbool.h> /* bool, false, true */
32
#include <fcntl.h> /* open(), O_WRONLY, O_RDONLY */
33
#include <iso646.h> /* and, or, not*/
34
#include <errno.h> /* errno, EINTR */
35
#include <sys/types.h> /* size_t, ssize_t, pid_t, DIR, struct
36
dirent */
37
#include <stddef.h> /* NULL */
38
#include <string.h> /* strlen(), memcmp() */
39
#include <stdio.h> /* asprintf(), perror() */
40
#include <unistd.h> /* close(), write(), readlink(),
41
read(), STDOUT_FILENO, sleep(),
42
fork(), setuid(), geteuid(),
43
setsid(), chdir(), dup2(),
44
STDERR_FILENO, execv() */
45
#include <stdlib.h> /* free(), EXIT_FAILURE, strtoul(),
46
realloc(), EXIT_SUCCESS, malloc(),
47
_exit() */
48
#include <stdlib.h> /* getenv() */
49
#include <dirent.h> /* opendir(), readdir(), closedir() */
50
#include <sys/stat.h> /* struct stat, lstat(), S_ISLNK */
51
52
sig_atomic_t interrupted_by_signal = 0;
53
54
static void termination_handler(__attribute__((unused))int signum){
55
interrupted_by_signal = 1;
56
}
57
58
static bool usplash_write(const char *cmd, const char *arg){
59
/*
60
* usplash_write("TIMEOUT", "15") will write "TIMEOUT 15\0"
61
* usplash_write("PULSATE", NULL) will write "PULSATE\0"
62
* SEE ALSO
63
* usplash_write(8)
64
*/
65
int ret;
66
int fifo_fd;
67
do{
68
fifo_fd = open("/dev/.initramfs/usplash_fifo", O_WRONLY);
69
if(fifo_fd == -1 and (errno != EINTR or interrupted_by_signal)){
70
return false;
71
}
72
}while(fifo_fd == -1);
73
74
const char *cmd_line;
75
size_t cmd_line_len;
76
char *cmd_line_alloc = NULL;
77
if(arg == NULL){
78
cmd_line = cmd;
79
cmd_line_len = strlen(cmd);
80
}else{
81
do{
82
ret = asprintf(&cmd_line_alloc, "%s %s", cmd, arg);
83
if(ret == -1 and (errno != EINTR or interrupted_by_signal)){
84
int e = errno;
85
close(fifo_fd);
86
errno = e;
87
return false;
88
}
89
}while(ret == -1);
90
cmd_line = cmd_line_alloc;
91
cmd_line_len = (size_t)ret + 1;
92
}
93
94
size_t written = 0;
95
while(not interrupted_by_signal and written < cmd_line_len){
96
ret = write(fifo_fd, cmd_line + written,
97
cmd_line_len - written);
98
if(ret == -1){
99
if(errno != EINTR or interrupted_by_signal){
100
int e = errno;
101
close(fifo_fd);
102
free(cmd_line_alloc);
103
errno = e;
104
return false;
105
} else {
106
continue;
107
}
108
}
109
written += (size_t)ret;
110
}
111
free(cmd_line_alloc);
112
do{
113
ret = close(fifo_fd);
114
if(ret == -1 and (errno != EINTR or interrupted_by_signal)){
115
return false;
116
}
117
}while(ret == -1);
118
if(interrupted_by_signal){
119
return false;
120
}
121
return true;
122
}
123
124
int main(__attribute__((unused))int argc,
125
__attribute__((unused))char **argv){
126
int ret = 0;
127
ssize_t sret;
128
bool an_error_occured = false;
129
130
/* Create prompt string */
131
char *prompt = NULL;
132
{
133
const char *const cryptsource = getenv("cryptsource");
134
const char *const crypttarget = getenv("crypttarget");
135
const char prompt_start[] = "Enter passphrase to unlock the disk";
136
137
if(cryptsource == NULL){
138
if(crypttarget == NULL){
139
ret = asprintf(&prompt, "%s: ", prompt_start);
140
} else {
141
ret = asprintf(&prompt, "%s (%s): ", prompt_start,
142
crypttarget);
143
}
144
} else {
145
if(crypttarget == NULL){
146
ret = asprintf(&prompt, "%s %s: ", prompt_start, cryptsource);
147
} else {
148
ret = asprintf(&prompt, "%s %s (%s): ", prompt_start,
149
cryptsource, crypttarget);
150
}
151
}
152
if(ret == -1){
153
return EXIT_FAILURE;
154
}
155
}
156
157
/* Find usplash process */
158
pid_t usplash_pid = 0;
159
char *cmdline = NULL;
160
size_t cmdline_len = 0;
161
const char usplash_name[] = "/sbin/usplash";
162
{
163
DIR *proc_dir = opendir("/proc");
164
if(proc_dir == NULL){
165
free(prompt);
166
perror("opendir");
167
return EXIT_FAILURE;
168
}
169
for(struct dirent *proc_ent = readdir(proc_dir);
170
proc_ent != NULL;
171
proc_ent = readdir(proc_dir)){
172
pid_t pid = (pid_t) strtoul(proc_ent->d_name, NULL, 10);
173
if(pid == 0){
174
/* Not a process */
175
continue;
176
}
177
/* Find the executable name by doing readlink() on the
178
/proc/<pid>/exe link */
179
char exe_target[sizeof(usplash_name)];
180
{
181
/* create file name string */
182
char *exe_link;
183
ret = asprintf(&exe_link, "/proc/%s/exe", proc_ent->d_name);
184
if(ret == -1){
185
perror("asprintf");
186
free(prompt);
187
closedir(proc_dir);
188
return EXIT_FAILURE;
189
}
190
191
/* Check that it refers to a symlink owned by root:root */
192
struct stat exe_stat;
193
ret = lstat(exe_link, &exe_stat);
194
if(ret == -1){
195
perror("lstat");
196
free(exe_link);
197
free(prompt);
198
closedir(proc_dir);
199
return EXIT_FAILURE;
200
}
201
if(not S_ISLNK(exe_stat.st_mode)
202
or exe_stat.st_uid != 0
203
or exe_stat.st_gid != 0){
204
free(exe_link);
205
continue;
206
}
207
208
sret = readlink(exe_link, exe_target, sizeof(exe_target));
209
free(exe_link);
210
if(sret == -1){
211
continue;
212
}
213
}
214
if((sret == ((ssize_t)sizeof(exe_target)-1))
215
and (memcmp(usplash_name, exe_target,
216
sizeof(exe_target)-1) == 0)){
217
usplash_pid = pid;
218
/* Read and save the command line of usplash in "cmdline" */
219
{
220
/* Open /proc/<pid>/cmdline */
221
int cl_fd;
222
{
223
char *cmdline_filename;
224
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
225
proc_ent->d_name);
226
if(ret == -1){
227
perror("asprintf");
228
free(prompt);
229
closedir(proc_dir);
230
return EXIT_FAILURE;
231
}
232
cl_fd = open(cmdline_filename, O_RDONLY);
233
if(cl_fd == -1){
234
perror("open");
235
free(cmdline_filename);
236
free(prompt);
237
closedir(proc_dir);
238
return EXIT_FAILURE;
239
}
240
free(cmdline_filename);
241
}
242
size_t cmdline_allocated = 0;
243
char *tmp;
244
const size_t blocksize = 1024;
245
do{
246
if(cmdline_len + blocksize > cmdline_allocated){
247
tmp = realloc(cmdline, cmdline_allocated + blocksize);
248
if(tmp == NULL){
249
perror("realloc");
250
free(cmdline);
251
free(prompt);
252
closedir(proc_dir);
253
return EXIT_FAILURE;
254
}
255
cmdline = tmp;
256
cmdline_allocated += blocksize;
257
}
258
sret = read(cl_fd, cmdline + cmdline_len,
259
cmdline_allocated - cmdline_len);
260
if(sret == -1){
261
perror("read");
262
free(cmdline);
263
free(prompt);
264
closedir(proc_dir);
265
return EXIT_FAILURE;
266
}
267
cmdline_len += (size_t)sret;
268
} while(sret != 0);
269
close(cl_fd);
270
}
271
break;
272
}
273
}
274
closedir(proc_dir);
275
}
276
if(usplash_pid == 0){
277
free(prompt);
278
return EXIT_FAILURE;
279
}
280
281
/* Set up the signal handler */
282
{
283
struct sigaction old_action,
284
new_action = { .sa_handler = termination_handler,
285
.sa_flags = 0 };
286
sigemptyset(&new_action.sa_mask);
287
sigaddset(&new_action.sa_mask, SIGINT);
288
sigaddset(&new_action.sa_mask, SIGHUP);
289
sigaddset(&new_action.sa_mask, SIGTERM);
290
ret = sigaction(SIGINT, NULL, &old_action);
291
if(ret == -1){
292
perror("sigaction");
293
free(prompt);
294
return EXIT_FAILURE;
295
}
296
if(old_action.sa_handler != SIG_IGN){
297
ret = sigaction(SIGINT, &new_action, NULL);
298
if(ret == -1){
299
perror("sigaction");
300
free(prompt);
301
return EXIT_FAILURE;
302
}
303
}
304
ret = sigaction(SIGHUP, NULL, &old_action);
305
if(ret == -1){
306
perror("sigaction");
307
free(prompt);
308
return EXIT_FAILURE;
309
}
310
if(old_action.sa_handler != SIG_IGN){
311
ret = sigaction(SIGHUP, &new_action, NULL);
312
if(ret == -1){
313
perror("sigaction");
314
free(prompt);
315
return EXIT_FAILURE;
316
}
317
}
318
ret = sigaction(SIGTERM, NULL, &old_action);
319
if(ret == -1){
320
perror("sigaction");
321
free(prompt);
322
return EXIT_FAILURE;
323
}
324
if(old_action.sa_handler != SIG_IGN){
325
ret = sigaction(SIGTERM, &new_action, NULL);
326
if(ret == -1){
327
perror("sigaction");
328
free(prompt);
329
return EXIT_FAILURE;
330
}
331
}
332
}
333
334
/* Write command to FIFO */
335
if(not interrupted_by_signal){
336
if(not usplash_write("TIMEOUT", "0")
337
and (errno != EINTR)){
338
perror("usplash_write");
339
an_error_occured = true;
340
}
341
}
342
if(not interrupted_by_signal and not an_error_occured){
343
if(not usplash_write("INPUTQUIET", prompt)
344
and (errno != EINTR)){
345
perror("usplash_write");
346
an_error_occured = true;
347
}
348
}
349
free(prompt);
350
351
/* This is not really a loop; while() is used to be able to "break"
352
out of it; those breaks are marked "Big" */
353
while(not interrupted_by_signal and not an_error_occured){
354
char *buf = NULL;
355
size_t buf_len = 0;
356
357
/* Open FIFO */
358
int fifo_fd;
359
do{
360
fifo_fd = open("/dev/.initramfs/usplash_outfifo", O_RDONLY);
361
if(fifo_fd == -1){
362
if(errno != EINTR){
363
perror("open");
364
an_error_occured = true;
365
break;
366
}
367
if(interrupted_by_signal){
368
break;
369
}
370
}
371
}while(fifo_fd == -1);
372
if(interrupted_by_signal or an_error_occured){
373
break; /* Big */
374
}
375
376
/* Read from FIFO */
377
size_t buf_allocated = 0;
378
const size_t blocksize = 1024;
379
do{
380
if(buf_len + blocksize > buf_allocated){
381
char *tmp = realloc(buf, buf_allocated + blocksize);
382
if(tmp == NULL){
383
perror("realloc");
384
an_error_occured = true;
385
break;
386
}
387
buf = tmp;
388
buf_allocated += blocksize;
389
}
390
do{
391
sret = read(fifo_fd, buf + buf_len, buf_allocated - buf_len);
392
if(sret == -1){
393
if(errno != EINTR){
394
perror("read");
395
an_error_occured = true;
396
break;
397
}
398
if(interrupted_by_signal){
399
break;
400
}
401
}
402
}while(sret == -1);
403
if(interrupted_by_signal or an_error_occured){
404
break;
405
}
406
407
buf_len += (size_t)sret;
408
}while(sret != 0);
409
close(fifo_fd);
410
if(interrupted_by_signal or an_error_occured){
411
break; /* Big */
412
}
413
414
if(not usplash_write("TIMEOUT", "15")
415
and (errno != EINTR)){
416
perror("usplash_write");
417
an_error_occured = true;
418
}
419
if(interrupted_by_signal or an_error_occured){
420
break; /* Big */
421
}
422
423
/* Print password to stdout */
424
size_t written = 0;
425
while(written < buf_len){
426
do{
427
sret = write(STDOUT_FILENO, buf + written, buf_len - written);
428
if(sret == -1){
429
if(errno != EINTR){
430
perror("write");
431
an_error_occured = true;
432
break;
433
}
434
if(interrupted_by_signal){
435
break;
436
}
437
}
438
}while(sret == -1);
439
if(interrupted_by_signal or an_error_occured){
440
break;
441
}
442
written += (size_t)sret;
443
}
444
free(buf);
445
if(not interrupted_by_signal and not an_error_occured){
446
free(cmdline);
447
return EXIT_SUCCESS;
448
}
449
break; /* Big */
450
} /* end of non-loop while() */
451
452
/* If we got here, an error or interrupt must have happened */
453
454
/* Create argc and argv for new usplash*/
455
int cmdline_argc = 0;
456
char **cmdline_argv = malloc(sizeof(char *));
457
{
458
size_t position = 0;
459
while(position < cmdline_len){
460
char **tmp = realloc(cmdline_argv,
461
(sizeof(char *)
462
* (size_t)(cmdline_argc + 2)));
463
if(tmp == NULL){
464
perror("realloc");
465
free(cmdline_argv);
466
return EXIT_FAILURE;
467
}
468
cmdline_argv = tmp;
469
cmdline_argv[cmdline_argc] = cmdline + position;
470
cmdline_argc++;
471
position += strlen(cmdline + position) + 1;
472
}
473
cmdline_argv[cmdline_argc] = NULL;
474
}
475
/* Kill old usplash */
476
kill(usplash_pid, SIGTERM);
477
sleep(2);
478
while(kill(usplash_pid, 0) == 0){
479
kill(usplash_pid, SIGKILL);
480
sleep(1);
481
}
482
pid_t new_usplash_pid = fork();
483
if(new_usplash_pid == 0){
484
/* Child; will become new usplash process */
485
486
/* Make the effective user ID (root) the only user ID instead of
487
the real user ID (mandos) */
488
ret = setuid(geteuid());
489
if(ret == -1){
490
perror("setuid");
491
}
492
493
setsid();
494
ret = chdir("/");
495
/* if(fork() != 0){ */
496
/* _exit(EXIT_SUCCESS); */
497
/* } */
498
ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
499
if(ret == -1){
500
perror("dup2");
501
_exit(EXIT_FAILURE);
502
}
503
504
execv(usplash_name, cmdline_argv);
505
if(not interrupted_by_signal){
506
perror("execv");
507
}
508
free(cmdline);
509
free(cmdline_argv);
510
_exit(EXIT_FAILURE);
511
}
512
free(cmdline);
513
free(cmdline_argv);
514
sleep(2);
515
if(not usplash_write("PULSATE", NULL)
516
and (errno != EINTR)){
517
perror("usplash_write");
518
}
519
520
return EXIT_FAILURE;
521
}
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