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- Committer: Björn Påhlsson
- Date: 2009-09-21 13:51:11 UTC
- mfrom: (379 mandos)
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 415.
- Revision ID: belorn@braxen-20090921135111-zvsg8bjfglffgp51
merge
- files added:
- debian/watch
- files removed:
- debian/mandos-client.config
- files modified:
- INSTALL
added
removed
plugins.d/usplash.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Passprompt - Read a password from usplash and output it
3
* Usplash - Read a password from usplash and output it
4
4
*
5
* Copyright © 2008 Teddy Hogeborn
6
* Copyright © 2008 Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
7
7
*
8
8
* This program is free software: you can redistribute it and/or
9
9
* modify it under the terms of the GNU General Public License as
19
19
* along with this program. If not, see
20
20
* <http://www.gnu.org/licenses/>.
21
21
*
22
* Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
23
* <https://www.fukt.bsnet.se/~teddy/>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
24
23
*/
25
24
26
#define _GNU_SOURCE /* asprintf() */
25
#define _GNU_SOURCE /* asprintf(), TEMP_FAILURE_RETRY() */
27
26
#include <signal.h> /* sig_atomic_t, struct sigaction,
28
27
sigemptyset(), sigaddset(), SIGINT,
29
28
SIGHUP, SIGTERM, sigaction(),
42
41
fork(), setuid(), geteuid(),
43
42
setsid(), chdir(), dup2(),
44
43
STDERR_FILENO, execv() */
45
#include <stdlib.h> /* free(), EXIT_FAILURE, strtoul(),
46
realloc(), EXIT_SUCCESS, malloc(),
47
_exit() */
44
#include <stdlib.h> /* free(), EXIT_FAILURE, realloc(),
45
EXIT_SUCCESS, malloc(), _exit() */
48
46
#include <stdlib.h> /* getenv() */
49
47
#include <dirent.h> /* opendir(), readdir(), closedir() */
48
#include <inttypes.h> /* intmax_t, strtoimax() */
50
49
#include <sys/stat.h> /* struct stat, lstat(), S_ISLNK */
51
50
52
51
sig_atomic_t interrupted_by_signal = 0;
52
int signal_received;
53
const char usplash_name[] = "/sbin/usplash";
53
54
54
static void termination_handler(__attribute__((unused))int signum){
55
static void termination_handler(int signum){
56
if(interrupted_by_signal){
57
return;
58
}
55
59
interrupted_by_signal = 1;
60
signal_received = signum;
56
61
}
57
62
58
static bool usplash_write(const char *cmd, const char *arg){
63
static bool usplash_write(int *fifo_fd_r,
64
const char *cmd, const char *arg){
59
65
/*
60
* usplash_write("TIMEOUT", "15") will write "TIMEOUT 15\0"
61
* usplash_write("PULSATE", NULL) will write "PULSATE\0"
66
* usplash_write(&fd, "TIMEOUT", "15") will write "TIMEOUT 15\0"
67
* usplash_write(&fd, "PULSATE", NULL) will write "PULSATE\0"
62
68
* SEE ALSO
63
69
* usplash_write(8)
64
70
*/
65
71
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)){
72
if(*fifo_fd_r == -1){
73
ret = open("/dev/.initramfs/usplash_fifo", O_WRONLY);
74
if(ret == -1){
70
75
return false;
71
76
}
72
}while(fifo_fd == -1);
77
*fifo_fd_r = ret;
78
}
73
79
74
80
const char *cmd_line;
75
81
size_t cmd_line_len;
76
82
char *cmd_line_alloc = NULL;
77
83
if(arg == NULL){
78
84
cmd_line = cmd;
79
cmd_line_len = strlen(cmd);
80
}else{
81
do{
85
cmd_line_len = strlen(cmd) + 1;
86
} else {
87
do {
82
88
ret = asprintf(&cmd_line_alloc, "%s %s", cmd, arg);
83
if(ret == -1 and (errno != EINTR or interrupted_by_signal)){
89
if(ret == -1){
84
90
int e = errno;
85
close(fifo_fd);
91
TEMP_FAILURE_RETRY(close(*fifo_fd_r));
86
92
errno = e;
87
93
return false;
88
94
}
89
}while(ret == -1);
95
} while(ret == -1);
90
96
cmd_line = cmd_line_alloc;
91
97
cmd_line_len = (size_t)ret + 1;
92
98
}
93
99
94
100
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
}
101
ssize_t sret = 0;
102
while(written < cmd_line_len){
103
sret = write(*fifo_fd_r, cmd_line + written,
104
cmd_line_len - written);
105
if(sret == -1){
106
int e = errno;
107
TEMP_FAILURE_RETRY(close(*fifo_fd_r));
108
free(cmd_line_alloc);
109
errno = e;
110
return false;
108
111
}
109
written += (size_t)ret;
112
written += (size_t)sret;
110
113
}
111
114
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
}
115
121
116
return true;
122
117
}
123
118
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;
119
/* Create prompt string */
120
char *makeprompt(void){
121
int ret = 0;
122
char *prompt;
123
const char *const cryptsource = getenv("cryptsource");
124
const char *const crypttarget = getenv("crypttarget");
125
const char prompt_start[] = "Enter passphrase to unlock the disk";
126
127
if(cryptsource == NULL){
128
if(crypttarget == NULL){
129
ret = asprintf(&prompt, "%s: ", prompt_start);
130
} else {
131
ret = asprintf(&prompt, "%s (%s): ", prompt_start,
132
crypttarget);
133
}
134
} else {
135
if(crypttarget == NULL){
136
ret = asprintf(&prompt, "%s %s: ", prompt_start, cryptsource);
137
} else {
138
ret = asprintf(&prompt, "%s %s (%s): ", prompt_start,
139
cryptsource, crypttarget);
140
}
141
}
142
if(ret == -1){
143
return NULL;
144
}
145
return prompt;
146
}
147
148
pid_t find_usplash(char **cmdline_r, size_t *cmdline_len_r){
149
int ret = 0;
150
ssize_t sret = 0;
159
151
char *cmdline = NULL;
160
152
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){
153
DIR *proc_dir = opendir("/proc");
154
if(proc_dir == NULL){
155
perror("opendir");
156
return -1;
157
}
158
errno = 0;
159
for(struct dirent *proc_ent = readdir(proc_dir);
160
proc_ent != NULL;
161
proc_ent = readdir(proc_dir)){
162
pid_t pid;
163
{
164
intmax_t tmpmax;
165
char *tmp;
166
tmpmax = strtoimax(proc_ent->d_name, &tmp, 10);
167
if(errno != 0 or tmp == proc_ent->d_name or *tmp != '\0'
168
or tmpmax != (pid_t)tmpmax){
174
169
/* 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)];
170
errno = 0;
171
continue;
172
}
173
pid = (pid_t)tmpmax;
174
}
175
/* Find the executable name by doing readlink() on the
176
/proc/<pid>/exe link */
177
char exe_target[sizeof(usplash_name)];
178
{
179
/* create file name string */
180
char *exe_link;
181
ret = asprintf(&exe_link, "/proc/%s/exe", proc_ent->d_name);
182
if(ret == -1){
183
perror("asprintf");
184
goto fail_find_usplash;
185
}
186
187
/* Check that it refers to a symlink owned by root:root */
188
struct stat exe_stat;
189
ret = lstat(exe_link, &exe_stat);
190
if(ret == -1){
191
if(errno == ENOENT){
192
free(exe_link);
193
continue;
194
}
195
perror("lstat");
196
free(exe_link);
197
goto fail_find_usplash;
198
}
199
if(not S_ISLNK(exe_stat.st_mode)
200
or exe_stat.st_uid != 0
201
or exe_stat.st_gid != 0){
202
free(exe_link);
203
continue;
204
}
205
206
sret = readlink(exe_link, exe_target, sizeof(exe_target));
207
free(exe_link);
208
}
209
/* Compare executable name */
210
if((sret != ((ssize_t)sizeof(exe_target)-1))
211
or (memcmp(usplash_name, exe_target,
212
sizeof(exe_target)-1) != 0)){
213
/* Not it */
214
continue;
215
}
216
/* Found usplash */
217
/* Read and save the command line of usplash in "cmdline" */
218
{
219
/* Open /proc/<pid>/cmdline */
220
int cl_fd;
180
221
{
181
/* create file name string */
182
char *exe_link;
183
ret = asprintf(&exe_link, "/proc/%s/exe", proc_ent->d_name);
222
char *cmdline_filename;
223
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
224
proc_ent->d_name);
184
225
if(ret == -1){
185
226
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;
227
goto fail_find_usplash;
228
}
229
cl_fd = open(cmdline_filename, O_RDONLY);
230
free(cmdline_filename);
231
if(cl_fd == -1){
232
perror("open");
233
goto fail_find_usplash;
212
234
}
213
235
}
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);
236
size_t cmdline_allocated = 0;
237
char *tmp;
238
const size_t blocksize = 1024;
239
do {
240
/* Allocate more space? */
241
if(cmdline_len + blocksize > cmdline_allocated){
242
tmp = realloc(cmdline, cmdline_allocated + blocksize);
243
if(tmp == NULL){
244
perror("realloc");
245
close(cl_fd);
246
goto fail_find_usplash;
241
247
}
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);
248
cmdline = tmp;
249
cmdline_allocated += blocksize;
250
}
251
/* Read data */
252
sret = read(cl_fd, cmdline + cmdline_len,
253
cmdline_allocated - cmdline_len);
254
if(sret == -1){
255
perror("read");
269
256
close(cl_fd);
257
goto fail_find_usplash;
270
258
}
271
break;
259
cmdline_len += (size_t)sret;
260
} while(sret != 0);
261
ret = close(cl_fd);
262
if(ret == -1){
263
perror("close");
264
goto fail_find_usplash;
272
265
}
273
266
}
267
/* Close directory */
268
ret = closedir(proc_dir);
269
if(ret == -1){
270
perror("closedir");
271
goto fail_find_usplash;
272
}
273
/* Success */
274
*cmdline_r = cmdline;
275
*cmdline_len_r = cmdline_len;
276
return pid;
277
}
278
279
fail_find_usplash:
280
281
free(cmdline);
282
if(proc_dir != NULL){
283
int e = errno;
274
284
closedir(proc_dir);
275
}
285
errno = e;
286
}
287
return 0;
288
}
289
290
int main(__attribute__((unused))int argc,
291
__attribute__((unused))char **argv){
292
int ret = 0;
293
ssize_t sret;
294
int fifo_fd = -1;
295
int outfifo_fd = -1;
296
char *buf = NULL;
297
size_t buf_len = 0;
298
pid_t usplash_pid = -1;
299
bool usplash_accessed = false;
300
301
char *prompt = makeprompt();
302
if(prompt == NULL){
303
goto failure;
304
}
305
306
/* Find usplash process */
307
char *cmdline = NULL;
308
size_t cmdline_len = 0;
309
usplash_pid = find_usplash(&cmdline, &cmdline_len);
276
310
if(usplash_pid == 0){
277
free(prompt);
278
return EXIT_FAILURE;
311
goto failure;
279
312
}
280
313
281
314
/* Set up the signal handler */
284
317
new_action = { .sa_handler = termination_handler,
285
318
.sa_flags = 0 };
286
319
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);
320
ret = sigaddset(&new_action.sa_mask, SIGINT);
321
if(ret == -1){
322
perror("sigaddset");
323
goto failure;
324
}
325
ret = sigaddset(&new_action.sa_mask, SIGHUP);
326
if(ret == -1){
327
perror("sigaddset");
328
goto failure;
329
}
330
ret = sigaddset(&new_action.sa_mask, SIGTERM);
331
if(ret == -1){
332
perror("sigaddset");
333
goto failure;
334
}
290
335
ret = sigaction(SIGINT, NULL, &old_action);
291
336
if(ret == -1){
292
perror("sigaction");
293
free(prompt);
294
return EXIT_FAILURE;
337
if(errno != EINTR){
338
perror("sigaction");
339
}
340
goto failure;
295
341
}
296
342
if(old_action.sa_handler != SIG_IGN){
297
343
ret = sigaction(SIGINT, &new_action, NULL);
298
344
if(ret == -1){
299
perror("sigaction");
300
free(prompt);
301
return EXIT_FAILURE;
345
if(errno != EINTR){
346
perror("sigaction");
347
}
348
goto failure;
302
349
}
303
350
}
304
351
ret = sigaction(SIGHUP, NULL, &old_action);
305
352
if(ret == -1){
306
perror("sigaction");
307
free(prompt);
308
return EXIT_FAILURE;
353
if(errno != EINTR){
354
perror("sigaction");
355
}
356
goto failure;
309
357
}
310
358
if(old_action.sa_handler != SIG_IGN){
311
359
ret = sigaction(SIGHUP, &new_action, NULL);
312
360
if(ret == -1){
313
perror("sigaction");
314
free(prompt);
315
return EXIT_FAILURE;
361
if(errno != EINTR){
362
perror("sigaction");
363
}
364
goto failure;
316
365
}
317
366
}
318
367
ret = sigaction(SIGTERM, NULL, &old_action);
319
368
if(ret == -1){
320
perror("sigaction");
321
free(prompt);
322
return EXIT_FAILURE;
369
if(errno != EINTR){
370
perror("sigaction");
371
}
372
goto failure;
323
373
}
324
374
if(old_action.sa_handler != SIG_IGN){
325
375
ret = sigaction(SIGTERM, &new_action, NULL);
326
376
if(ret == -1){
327
perror("sigaction");
328
free(prompt);
329
return EXIT_FAILURE;
377
if(errno != EINTR){
378
perror("sigaction");
379
}
380
goto failure;
330
381
}
331
382
}
332
383
}
333
384
385
usplash_accessed = true;
334
386
/* 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
}
387
if(not usplash_write(&fifo_fd, "TIMEOUT", "0")){
388
if(errno != EINTR){
389
perror("usplash_write");
390
}
391
goto failure;
392
}
393
394
if(interrupted_by_signal){
395
goto failure;
396
}
397
398
if(not usplash_write(&fifo_fd, "INPUTQUIET", prompt)){
399
if(errno != EINTR){
400
perror("usplash_write");
401
}
402
goto failure;
403
}
404
405
if(interrupted_by_signal){
406
goto failure;
407
}
408
349
409
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){
410
prompt = NULL;
411
412
/* Read reply from usplash */
413
/* Open FIFO */
414
outfifo_fd = open("/dev/.initramfs/usplash_outfifo", O_RDONLY);
415
if(outfifo_fd == -1){
416
if(errno != EINTR){
417
perror("open");
418
}
419
goto failure;
420
}
421
422
if(interrupted_by_signal){
423
goto failure;
424
}
425
426
/* Read from FIFO */
427
size_t buf_allocated = 0;
428
const size_t blocksize = 1024;
429
do {
430
/* Allocate more space */
431
if(buf_len + blocksize > buf_allocated){
432
char *tmp = realloc(buf, buf_allocated + blocksize);
433
if(tmp == NULL){
362
434
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
435
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 */
436
}
437
goto failure;
438
}
439
buf = tmp;
440
buf_allocated += blocksize;
441
}
442
sret = read(outfifo_fd, buf + buf_len,
443
buf_allocated - buf_len);
444
if(sret == -1){
445
if(errno != EINTR){
446
perror("read");
447
}
448
TEMP_FAILURE_RETRY(close(outfifo_fd));
449
goto failure;
450
}
451
if(interrupted_by_signal){
452
break;
453
}
454
455
buf_len += (size_t)sret;
456
} while(sret != 0);
457
ret = close(outfifo_fd);
458
if(ret == -1){
459
if(errno != EINTR){
460
perror("close");
461
}
462
goto failure;
463
}
464
outfifo_fd = -1;
465
466
if(interrupted_by_signal){
467
goto failure;
468
}
469
470
if(not usplash_write(&fifo_fd, "TIMEOUT", "15")){
471
if(errno != EINTR){
472
perror("usplash_write");
473
}
474
goto failure;
475
}
476
477
if(interrupted_by_signal){
478
goto failure;
479
}
480
481
ret = close(fifo_fd);
482
if(ret == -1){
483
if(errno != EINTR){
484
perror("close");
485
}
486
goto failure;
487
}
488
fifo_fd = -1;
489
490
/* Print password to stdout */
491
size_t written = 0;
492
while(written < buf_len){
493
do {
494
sret = write(STDOUT_FILENO, buf + written, buf_len - written);
495
if(sret == -1){
496
if(errno != EINTR){
497
perror("write");
498
}
499
goto failure;
500
}
501
} while(sret == -1);
502
503
if(interrupted_by_signal){
504
goto failure;
505
}
506
written += (size_t)sret;
507
}
508
free(buf);
509
buf = NULL;
510
511
if(interrupted_by_signal){
512
goto failure;
513
}
514
515
free(cmdline);
516
return EXIT_SUCCESS;
517
518
failure:
519
520
free(buf);
521
522
free(prompt);
523
524
/* If usplash was never accessed, we can stop now */
525
if(not usplash_accessed){
526
return EXIT_FAILURE;
527
}
528
529
/* Close FIFO */
530
if(fifo_fd != -1){
531
ret = (int)TEMP_FAILURE_RETRY(close(fifo_fd));
532
if(ret == -1 and errno != EINTR){
533
perror("close");
534
}
535
fifo_fd = -1;
536
}
537
538
/* Close output FIFO */
539
if(outfifo_fd != -1){
540
ret = (int)TEMP_FAILURE_RETRY(close(outfifo_fd));
541
if(ret == -1){
542
perror("close");
543
}
544
}
453
545
454
546
/* Create argc and argv for new usplash*/
455
547
int cmdline_argc = 0;
479
571
kill(usplash_pid, SIGKILL);
480
572
sleep(1);
481
573
}
574
482
575
pid_t new_usplash_pid = fork();
483
576
if(new_usplash_pid == 0){
484
577
/* Child; will become new usplash process */
485
578
486
579
/* Make the effective user ID (root) the only user ID instead of
487
the real user ID (mandos) */
580
the real user ID (_mandos) */
488
581
ret = setuid(geteuid());
489
582
if(ret == -1){
490
583
perror("setuid");
512
605
free(cmdline);
513
606
free(cmdline_argv);
514
607
sleep(2);
515
if(not usplash_write("PULSATE", NULL)
516
and (errno != EINTR)){
517
perror("usplash_write");
608
if(not usplash_write(&fifo_fd, "PULSATE", NULL)){
609
if(errno != EINTR){
610
perror("usplash_write");
611
}
612
}
613
614
/* Close FIFO (again) */
615
if(fifo_fd != -1){
616
ret = (int)TEMP_FAILURE_RETRY(close(fifo_fd));
617
if(ret == -1 and errno != EINTR){
618
perror("close");
619
}
620
fifo_fd = -1;
621
}
622
623
if(interrupted_by_signal){
624
struct sigaction signal_action = { .sa_handler = SIG_DFL };
625
sigemptyset(&signal_action.sa_mask);
626
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
627
&signal_action, NULL));
628
if(ret == -1){
629
perror("sigaction");
630
}
631
do {
632
ret = raise(signal_received);
633
} while(ret != 0 and errno == EINTR);
634
if(ret != 0){
635
perror("raise");
636
abort();
637
}
638
TEMP_FAILURE_RETRY(pause());
518
639
}
519
640
520
641
return EXIT_FAILURE;
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Version: 2.0.2.dev0