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/usplash.c
- browse files at revision 420
- compare with another revision
- download diff
- download tarball
- view history from revision 420
- Committer: teddy at bsnet
- Date: 2010-09-09 18:28:57 UTC
- mfrom: (237.3.1 mandos-makefile-warning)
- Revision ID: teddy@fukt.bsnet.se-20100909182857-fuq4l9zetww2fyxw
* Makefile: Merge branch adding warning messages to "run-*" targets.
- files added:
- dbus-mandos.conf
- files removed:
- debian/mandos-client.config
- files modified:
- INSTALL
added
removed
plugins.d/usplash.c
1
#define _GNU_SOURCE /* asprintf() */
1
/* -*- coding: utf-8 -*- */
2
/*
3
* Usplash - 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 <mandos@fukt.bsnet.se>.
23
*/
24
25
#define _GNU_SOURCE /* asprintf(), TEMP_FAILURE_RETRY() */
2
26
#include <signal.h> /* sig_atomic_t, struct sigaction,
3
27
sigemptyset(), sigaddset(), SIGINT,
4
28
SIGHUP, SIGTERM, sigaction(),
17
41
fork(), setuid(), geteuid(),
18
42
setsid(), chdir(), dup2(),
19
43
STDERR_FILENO, execv() */
20
#include <stdlib.h> /* free(), EXIT_FAILURE, strtoul(),
21
realloc(), EXIT_SUCCESS, malloc(),
22
_exit() */
44
#include <stdlib.h> /* free(), EXIT_FAILURE, realloc(),
45
EXIT_SUCCESS, malloc(), _exit() */
23
46
#include <stdlib.h> /* getenv() */
24
47
#include <dirent.h> /* opendir(), readdir(), closedir() */
48
#include <inttypes.h> /* intmax_t, strtoimax() */
25
49
#include <sys/stat.h> /* struct stat, lstat(), S_ISLNK */
50
#include <sysexits.h> /* EX_OSERR, EX_UNAVAILABLE */
26
51
27
52
sig_atomic_t interrupted_by_signal = 0;
53
int signal_received;
54
const char usplash_name[] = "/sbin/usplash";
28
55
29
static void termination_handler(__attribute__((unused))int signum){
56
static void termination_handler(int signum){
57
if(interrupted_by_signal){
58
return;
59
}
30
60
interrupted_by_signal = 1;
61
signal_received = signum;
31
62
}
32
63
33
static bool usplash_write(const char *cmd, const char *arg){
64
static bool usplash_write(int *fifo_fd_r,
65
const char *cmd, const char *arg){
34
66
/*
35
* usplash_write("TIMEOUT", "15") will write "TIMEOUT 15\0"
36
* usplash_write("PULSATE", NULL) will write "PULSATE\0"
67
* usplash_write(&fd, "TIMEOUT", "15") will write "TIMEOUT 15\0"
68
* usplash_write(&fd, "PULSATE", NULL) will write "PULSATE\0"
37
69
* SEE ALSO
38
70
* usplash_write(8)
39
71
*/
40
72
int ret;
41
int fifo_fd;
42
do{
43
fifo_fd = open("/dev/.initramfs/usplash_fifo", O_WRONLY);
44
if(fifo_fd == -1 and (errno != EINTR or interrupted_by_signal)){
73
if(*fifo_fd_r == -1){
74
ret = open("/dev/.initramfs/usplash_fifo", O_WRONLY);
75
if(ret == -1){
45
76
return false;
46
77
}
47
}while(fifo_fd == -1);
78
*fifo_fd_r = ret;
79
}
48
80
49
81
const char *cmd_line;
50
82
size_t cmd_line_len;
51
83
char *cmd_line_alloc = NULL;
52
84
if(arg == NULL){
53
85
cmd_line = cmd;
54
cmd_line_len = strlen(cmd);
55
}else{
56
do{
86
cmd_line_len = strlen(cmd) + 1;
87
} else {
88
do {
57
89
ret = asprintf(&cmd_line_alloc, "%s %s", cmd, arg);
58
if(ret == -1 and (errno != EINTR or interrupted_by_signal)){
90
if(ret == -1){
59
91
int e = errno;
60
close(fifo_fd);
92
TEMP_FAILURE_RETRY(close(*fifo_fd_r));
61
93
errno = e;
62
94
return false;
63
95
}
64
}while(ret == -1);
96
} while(ret == -1);
65
97
cmd_line = cmd_line_alloc;
66
98
cmd_line_len = (size_t)ret + 1;
67
99
}
68
100
69
101
size_t written = 0;
70
while(not interrupted_by_signal and written < cmd_line_len){
71
ret = write(fifo_fd, cmd_line + written,
72
cmd_line_len - written);
73
if(ret == -1){
74
if(errno != EINTR or interrupted_by_signal){
75
int e = errno;
76
close(fifo_fd);
77
free(cmd_line_alloc);
78
errno = e;
79
return false;
80
} else {
81
continue;
82
}
102
ssize_t sret = 0;
103
while(written < cmd_line_len){
104
sret = write(*fifo_fd_r, cmd_line + written,
105
cmd_line_len - written);
106
if(sret == -1){
107
int e = errno;
108
TEMP_FAILURE_RETRY(close(*fifo_fd_r));
109
free(cmd_line_alloc);
110
errno = e;
111
return false;
83
112
}
84
written += (size_t)ret;
113
written += (size_t)sret;
85
114
}
86
115
free(cmd_line_alloc);
87
do{
88
ret = close(fifo_fd);
89
if(ret == -1 and (errno != EINTR or interrupted_by_signal)){
90
return false;
91
}
92
}while(ret == -1);
93
if(interrupted_by_signal){
94
return false;
95
}
116
96
117
return true;
97
118
}
98
119
99
int main(__attribute__((unused))int argc,
100
__attribute__((unused))char **argv){
101
int ret = 0;
102
ssize_t sret;
103
bool an_error_occured = false;
104
105
/* Create prompt string */
106
char *prompt = NULL;
107
{
108
const char *const cryptsource = getenv("cryptsource");
109
const char *const crypttarget = getenv("crypttarget");
110
const char prompt_start[] = "Enter passphrase to unlock the disk";
111
112
if(cryptsource == NULL){
113
if(crypttarget == NULL){
114
ret = asprintf(&prompt, "%s: ", prompt_start);
115
} else {
116
ret = asprintf(&prompt, "%s (%s): ", prompt_start,
117
crypttarget);
118
}
119
} else {
120
if(crypttarget == NULL){
121
ret = asprintf(&prompt, "%s %s: ", prompt_start, cryptsource);
122
} else {
123
ret = asprintf(&prompt, "%s %s (%s): ", prompt_start,
124
cryptsource, crypttarget);
125
}
126
}
127
if(ret == -1){
128
return EXIT_FAILURE;
129
}
130
}
131
132
/* Find usplash process */
133
pid_t usplash_pid = 0;
120
/* Create prompt string */
121
char *makeprompt(void){
122
int ret = 0;
123
char *prompt;
124
const char *const cryptsource = getenv("cryptsource");
125
const char *const crypttarget = getenv("crypttarget");
126
const char prompt_start[] = "Enter passphrase to unlock the disk";
127
128
if(cryptsource == NULL){
129
if(crypttarget == NULL){
130
ret = asprintf(&prompt, "%s: ", prompt_start);
131
} else {
132
ret = asprintf(&prompt, "%s (%s): ", prompt_start,
133
crypttarget);
134
}
135
} else {
136
if(crypttarget == NULL){
137
ret = asprintf(&prompt, "%s %s: ", prompt_start, cryptsource);
138
} else {
139
ret = asprintf(&prompt, "%s %s (%s): ", prompt_start,
140
cryptsource, crypttarget);
141
}
142
}
143
if(ret == -1){
144
return NULL;
145
}
146
return prompt;
147
}
148
149
pid_t find_usplash(char **cmdline_r, size_t *cmdline_len_r){
150
int ret = 0;
151
ssize_t sret = 0;
134
152
char *cmdline = NULL;
135
153
size_t cmdline_len = 0;
136
const char usplash_name[] = "/sbin/usplash";
137
{
138
DIR *proc_dir = opendir("/proc");
139
if(proc_dir == NULL){
140
free(prompt);
141
perror("opendir");
142
return EXIT_FAILURE;
143
}
144
for(struct dirent *proc_ent = readdir(proc_dir);
145
proc_ent != NULL;
146
proc_ent = readdir(proc_dir)){
147
pid_t pid = (pid_t) strtoul(proc_ent->d_name, NULL, 10);
148
if(pid == 0){
154
DIR *proc_dir = opendir("/proc");
155
if(proc_dir == NULL){
156
perror("opendir");
157
return -1;
158
}
159
errno = 0;
160
for(struct dirent *proc_ent = readdir(proc_dir);
161
proc_ent != NULL;
162
proc_ent = readdir(proc_dir)){
163
pid_t pid;
164
{
165
intmax_t tmpmax;
166
char *tmp;
167
tmpmax = strtoimax(proc_ent->d_name, &tmp, 10);
168
if(errno != 0 or tmp == proc_ent->d_name or *tmp != '\0'
169
or tmpmax != (pid_t)tmpmax){
149
170
/* Not a process */
150
continue;
151
}
152
/* Find the executable name by doing readlink() on the
153
/proc/<pid>/exe link */
154
char exe_target[sizeof(usplash_name)];
171
errno = 0;
172
continue;
173
}
174
pid = (pid_t)tmpmax;
175
}
176
/* Find the executable name by doing readlink() on the
177
/proc/<pid>/exe link */
178
char exe_target[sizeof(usplash_name)];
179
{
180
/* create file name string */
181
char *exe_link;
182
ret = asprintf(&exe_link, "/proc/%s/exe", proc_ent->d_name);
183
if(ret == -1){
184
perror("asprintf");
185
goto fail_find_usplash;
186
}
187
188
/* Check that it refers to a symlink owned by root:root */
189
struct stat exe_stat;
190
ret = lstat(exe_link, &exe_stat);
191
if(ret == -1){
192
if(errno == ENOENT){
193
free(exe_link);
194
continue;
195
}
196
perror("lstat");
197
free(exe_link);
198
goto fail_find_usplash;
199
}
200
if(not S_ISLNK(exe_stat.st_mode)
201
or exe_stat.st_uid != 0
202
or exe_stat.st_gid != 0){
203
free(exe_link);
204
continue;
205
}
206
207
sret = readlink(exe_link, exe_target, sizeof(exe_target));
208
free(exe_link);
209
}
210
/* Compare executable name */
211
if((sret != ((ssize_t)sizeof(exe_target)-1))
212
or (memcmp(usplash_name, exe_target,
213
sizeof(exe_target)-1) != 0)){
214
/* Not it */
215
continue;
216
}
217
/* Found usplash */
218
/* Read and save the command line of usplash in "cmdline" */
219
{
220
/* Open /proc/<pid>/cmdline */
221
int cl_fd;
155
222
{
156
/* create file name string */
157
char *exe_link;
158
ret = asprintf(&exe_link, "/proc/%s/exe", proc_ent->d_name);
223
char *cmdline_filename;
224
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
225
proc_ent->d_name);
159
226
if(ret == -1){
160
227
perror("asprintf");
161
free(prompt);
162
closedir(proc_dir);
163
return EXIT_FAILURE;
164
}
165
166
/* Check that it refers to a symlink owned by root:root */
167
struct stat exe_stat;
168
ret = lstat(exe_link, &exe_stat);
169
if(ret == -1){
170
perror("lstat");
171
free(exe_link);
172
free(prompt);
173
closedir(proc_dir);
174
return EXIT_FAILURE;
175
}
176
if(not S_ISLNK(exe_stat.st_mode)
177
or exe_stat.st_uid != 0
178
or exe_stat.st_gid != 0){
179
free(exe_link);
180
continue;
181
}
182
183
sret = readlink(exe_link, exe_target, sizeof(exe_target));
184
free(exe_link);
185
if(sret == -1){
186
continue;
228
goto fail_find_usplash;
229
}
230
cl_fd = open(cmdline_filename, O_RDONLY);
231
free(cmdline_filename);
232
if(cl_fd == -1){
233
perror("open");
234
goto fail_find_usplash;
187
235
}
188
236
}
189
if((sret == ((ssize_t)sizeof(exe_target)-1))
190
and (memcmp(usplash_name, exe_target,
191
sizeof(exe_target)-1) == 0)){
192
usplash_pid = pid;
193
/* Read and save the command line of usplash in "cmdline" */
194
{
195
/* Open /proc/<pid>/cmdline */
196
int cl_fd;
197
{
198
char *cmdline_filename;
199
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
200
proc_ent->d_name);
201
if(ret == -1){
202
perror("asprintf");
203
free(prompt);
204
closedir(proc_dir);
205
return EXIT_FAILURE;
206
}
207
cl_fd = open(cmdline_filename, O_RDONLY);
208
if(cl_fd == -1){
209
perror("open");
210
free(cmdline_filename);
211
free(prompt);
212
closedir(proc_dir);
213
return EXIT_FAILURE;
214
}
215
free(cmdline_filename);
237
size_t cmdline_allocated = 0;
238
char *tmp;
239
const size_t blocksize = 1024;
240
do {
241
/* Allocate more space? */
242
if(cmdline_len + blocksize > cmdline_allocated){
243
tmp = realloc(cmdline, cmdline_allocated + blocksize);
244
if(tmp == NULL){
245
perror("realloc");
246
close(cl_fd);
247
goto fail_find_usplash;
216
248
}
217
size_t cmdline_allocated = 0;
218
char *tmp;
219
const size_t blocksize = 1024;
220
do{
221
if(cmdline_len + blocksize > cmdline_allocated){
222
tmp = realloc(cmdline, cmdline_allocated + blocksize);
223
if(tmp == NULL){
224
perror("realloc");
225
free(cmdline);
226
free(prompt);
227
closedir(proc_dir);
228
return EXIT_FAILURE;
229
}
230
cmdline = tmp;
231
cmdline_allocated += blocksize;
232
}
233
sret = read(cl_fd, cmdline + cmdline_len,
234
cmdline_allocated - cmdline_len);
235
if(sret == -1){
236
perror("read");
237
free(cmdline);
238
free(prompt);
239
closedir(proc_dir);
240
return EXIT_FAILURE;
241
}
242
cmdline_len += (size_t)sret;
243
} while(sret != 0);
249
cmdline = tmp;
250
cmdline_allocated += blocksize;
251
}
252
/* Read data */
253
sret = read(cl_fd, cmdline + cmdline_len,
254
cmdline_allocated - cmdline_len);
255
if(sret == -1){
256
perror("read");
244
257
close(cl_fd);
258
goto fail_find_usplash;
245
259
}
246
break;
260
cmdline_len += (size_t)sret;
261
} while(sret != 0);
262
ret = close(cl_fd);
263
if(ret == -1){
264
perror("close");
265
goto fail_find_usplash;
247
266
}
248
267
}
268
/* Close directory */
269
ret = closedir(proc_dir);
270
if(ret == -1){
271
perror("closedir");
272
goto fail_find_usplash;
273
}
274
/* Success */
275
*cmdline_r = cmdline;
276
*cmdline_len_r = cmdline_len;
277
return pid;
278
}
279
280
fail_find_usplash:
281
282
free(cmdline);
283
if(proc_dir != NULL){
284
int e = errno;
249
285
closedir(proc_dir);
250
}
286
errno = e;
287
}
288
return 0;
289
}
290
291
int main(__attribute__((unused))int argc,
292
__attribute__((unused))char **argv){
293
int ret = 0;
294
ssize_t sret;
295
int fifo_fd = -1;
296
int outfifo_fd = -1;
297
char *buf = NULL;
298
size_t buf_len = 0;
299
pid_t usplash_pid = -1;
300
bool usplash_accessed = false;
301
int status = EXIT_FAILURE; /* Default failure exit status */
302
303
char *prompt = makeprompt();
304
if(prompt == NULL){
305
status = EX_OSERR;
306
goto failure;
307
}
308
309
/* Find usplash process */
310
char *cmdline = NULL;
311
size_t cmdline_len = 0;
312
usplash_pid = find_usplash(&cmdline, &cmdline_len);
251
313
if(usplash_pid == 0){
252
free(prompt);
253
return EXIT_FAILURE;
314
status = EX_UNAVAILABLE;
315
goto failure;
254
316
}
255
317
256
318
/* Set up the signal handler */
259
321
new_action = { .sa_handler = termination_handler,
260
322
.sa_flags = 0 };
261
323
sigemptyset(&new_action.sa_mask);
262
sigaddset(&new_action.sa_mask, SIGINT);
263
sigaddset(&new_action.sa_mask, SIGHUP);
264
sigaddset(&new_action.sa_mask, SIGTERM);
324
ret = sigaddset(&new_action.sa_mask, SIGINT);
325
if(ret == -1){
326
perror("sigaddset");
327
status = EX_OSERR;
328
goto failure;
329
}
330
ret = sigaddset(&new_action.sa_mask, SIGHUP);
331
if(ret == -1){
332
perror("sigaddset");
333
status = EX_OSERR;
334
goto failure;
335
}
336
ret = sigaddset(&new_action.sa_mask, SIGTERM);
337
if(ret == -1){
338
perror("sigaddset");
339
status = EX_OSERR;
340
goto failure;
341
}
265
342
ret = sigaction(SIGINT, NULL, &old_action);
266
343
if(ret == -1){
267
perror("sigaction");
268
free(prompt);
269
return EXIT_FAILURE;
344
if(errno != EINTR){
345
perror("sigaction");
346
status = EX_OSERR;
347
}
348
goto failure;
270
349
}
271
350
if(old_action.sa_handler != SIG_IGN){
272
351
ret = sigaction(SIGINT, &new_action, NULL);
273
352
if(ret == -1){
274
perror("sigaction");
275
free(prompt);
276
return EXIT_FAILURE;
353
if(errno != EINTR){
354
perror("sigaction");
355
status = EX_OSERR;
356
}
357
goto failure;
277
358
}
278
359
}
279
360
ret = sigaction(SIGHUP, NULL, &old_action);
280
361
if(ret == -1){
281
perror("sigaction");
282
free(prompt);
283
return EXIT_FAILURE;
362
if(errno != EINTR){
363
perror("sigaction");
364
status = EX_OSERR;
365
}
366
goto failure;
284
367
}
285
368
if(old_action.sa_handler != SIG_IGN){
286
369
ret = sigaction(SIGHUP, &new_action, NULL);
287
370
if(ret == -1){
288
perror("sigaction");
289
free(prompt);
290
return EXIT_FAILURE;
371
if(errno != EINTR){
372
perror("sigaction");
373
status = EX_OSERR;
374
}
375
goto failure;
291
376
}
292
377
}
293
378
ret = sigaction(SIGTERM, NULL, &old_action);
294
379
if(ret == -1){
295
perror("sigaction");
296
free(prompt);
297
return EXIT_FAILURE;
380
if(errno != EINTR){
381
perror("sigaction");
382
status = EX_OSERR;
383
}
384
goto failure;
298
385
}
299
386
if(old_action.sa_handler != SIG_IGN){
300
387
ret = sigaction(SIGTERM, &new_action, NULL);
301
388
if(ret == -1){
302
perror("sigaction");
303
free(prompt);
304
return EXIT_FAILURE;
389
if(errno != EINTR){
390
perror("sigaction");
391
status = EX_OSERR;
392
}
393
goto failure;
305
394
}
306
395
}
307
396
}
308
397
398
usplash_accessed = true;
309
399
/* Write command to FIFO */
310
if(not interrupted_by_signal){
311
if(not usplash_write("TIMEOUT", "0")
312
and (errno != EINTR)){
313
perror("usplash_write");
314
an_error_occured = true;
315
}
316
}
317
if(not interrupted_by_signal and not an_error_occured){
318
if(not usplash_write("INPUTQUIET", prompt)
319
and (errno != EINTR)){
320
perror("usplash_write");
321
an_error_occured = true;
322
}
323
}
400
if(not usplash_write(&fifo_fd, "TIMEOUT", "0")){
401
if(errno != EINTR){
402
perror("usplash_write");
403
status = EX_OSERR;
404
}
405
goto failure;
406
}
407
408
if(interrupted_by_signal){
409
goto failure;
410
}
411
412
if(not usplash_write(&fifo_fd, "INPUTQUIET", prompt)){
413
if(errno != EINTR){
414
perror("usplash_write");
415
status = EX_OSERR;
416
}
417
goto failure;
418
}
419
420
if(interrupted_by_signal){
421
goto failure;
422
}
423
324
424
free(prompt);
325
326
/* This is not really a loop; while() is used to be able to "break"
327
out of it; those breaks are marked "Big" */
328
while(not interrupted_by_signal and not an_error_occured){
329
char *buf = NULL;
330
size_t buf_len = 0;
331
332
/* Open FIFO */
333
int fifo_fd;
334
do{
335
fifo_fd = open("/dev/.initramfs/usplash_outfifo", O_RDONLY);
336
if(fifo_fd == -1){
425
prompt = NULL;
426
427
/* Read reply from usplash */
428
/* Open FIFO */
429
outfifo_fd = open("/dev/.initramfs/usplash_outfifo", O_RDONLY);
430
if(outfifo_fd == -1){
431
if(errno != EINTR){
432
perror("open");
433
status = EX_OSERR;
434
}
435
goto failure;
436
}
437
438
if(interrupted_by_signal){
439
goto failure;
440
}
441
442
/* Read from FIFO */
443
size_t buf_allocated = 0;
444
const size_t blocksize = 1024;
445
do {
446
/* Allocate more space */
447
if(buf_len + blocksize > buf_allocated){
448
char *tmp = realloc(buf, buf_allocated + blocksize);
449
if(tmp == NULL){
337
450
if(errno != EINTR){
338
perror("open");
339
an_error_occured = true;
340
break;
341
}
342
if(interrupted_by_signal){
343
break;
344
}
345
}
346
}while(fifo_fd == -1);
347
if(interrupted_by_signal or an_error_occured){
348
break; /* Big */
349
}
350
351
/* Read from FIFO */
352
size_t buf_allocated = 0;
353
const size_t blocksize = 1024;
354
do{
355
if(buf_len + blocksize > buf_allocated){
356
char *tmp = realloc(buf, buf_allocated + blocksize);
357
if(tmp == NULL){
358
451
perror("realloc");
359
an_error_occured = true;
360
break;
361
}
362
buf = tmp;
363
buf_allocated += blocksize;
364
}
365
do{
366
sret = read(fifo_fd, buf + buf_len, buf_allocated - buf_len);
367
if(sret == -1){
368
if(errno != EINTR){
369
perror("read");
370
an_error_occured = true;
371
break;
372
}
373
if(interrupted_by_signal){
374
break;
375
}
376
}
377
}while(sret == -1);
378
if(interrupted_by_signal or an_error_occured){
379
break;
380
}
381
382
buf_len += (size_t)sret;
383
}while(sret != 0);
384
close(fifo_fd);
385
if(interrupted_by_signal or an_error_occured){
386
break; /* Big */
387
}
388
389
if(not usplash_write("TIMEOUT", "15")
390
and (errno != EINTR)){
391
perror("usplash_write");
392
an_error_occured = true;
393
}
394
if(interrupted_by_signal or an_error_occured){
395
break; /* Big */
396
}
397
398
/* Print password to stdout */
399
size_t written = 0;
400
while(written < buf_len){
401
do{
402
sret = write(STDOUT_FILENO, buf + written, buf_len - written);
403
if(sret == -1){
404
if(errno != EINTR){
405
perror("write");
406
an_error_occured = true;
407
break;
408
}
409
if(interrupted_by_signal){
410
break;
411
}
412
}
413
}while(sret == -1);
414
if(interrupted_by_signal or an_error_occured){
415
break;
416
}
417
written += (size_t)sret;
418
}
419
free(buf);
420
if(not interrupted_by_signal and not an_error_occured){
421
free(cmdline);
422
return EXIT_SUCCESS;
423
}
424
break; /* Big */
425
} /* end of non-loop while() */
426
427
/* If we got here, an error or interrupt must have happened */
452
status = EX_OSERR;
453
}
454
goto failure;
455
}
456
buf = tmp;
457
buf_allocated += blocksize;
458
}
459
sret = read(outfifo_fd, buf + buf_len,
460
buf_allocated - buf_len);
461
if(sret == -1){
462
if(errno != EINTR){
463
perror("read");
464
status = EX_OSERR;
465
}
466
TEMP_FAILURE_RETRY(close(outfifo_fd));
467
goto failure;
468
}
469
if(interrupted_by_signal){
470
break;
471
}
472
473
buf_len += (size_t)sret;
474
} while(sret != 0);
475
ret = close(outfifo_fd);
476
if(ret == -1){
477
if(errno != EINTR){
478
perror("close");
479
status = EX_OSERR;
480
}
481
goto failure;
482
}
483
outfifo_fd = -1;
484
485
if(interrupted_by_signal){
486
goto failure;
487
}
488
489
if(not usplash_write(&fifo_fd, "TIMEOUT", "15")){
490
if(errno != EINTR){
491
perror("usplash_write");
492
status = EX_OSERR;
493
}
494
goto failure;
495
}
496
497
if(interrupted_by_signal){
498
goto failure;
499
}
500
501
ret = close(fifo_fd);
502
if(ret == -1){
503
if(errno != EINTR){
504
perror("close");
505
status = EX_OSERR;
506
}
507
goto failure;
508
}
509
fifo_fd = -1;
510
511
/* Print password to stdout */
512
size_t written = 0;
513
while(written < buf_len){
514
do {
515
sret = write(STDOUT_FILENO, buf + written, buf_len - written);
516
if(sret == -1){
517
if(errno != EINTR){
518
perror("write");
519
status = EX_OSERR;
520
}
521
goto failure;
522
}
523
} while(sret == -1);
524
525
if(interrupted_by_signal){
526
goto failure;
527
}
528
written += (size_t)sret;
529
}
530
free(buf);
531
buf = NULL;
532
533
if(interrupted_by_signal){
534
goto failure;
535
}
536
537
free(cmdline);
538
return EXIT_SUCCESS;
539
540
failure:
541
542
free(buf);
543
544
free(prompt);
545
546
/* If usplash was never accessed, we can stop now */
547
if(not usplash_accessed){
548
return status;
549
}
550
551
/* Close FIFO */
552
if(fifo_fd != -1){
553
ret = (int)TEMP_FAILURE_RETRY(close(fifo_fd));
554
if(ret == -1 and errno != EINTR){
555
perror("close");
556
}
557
fifo_fd = -1;
558
}
559
560
/* Close output FIFO */
561
if(outfifo_fd != -1){
562
ret = (int)TEMP_FAILURE_RETRY(close(outfifo_fd));
563
if(ret == -1){
564
perror("close");
565
}
566
}
428
567
429
568
/* Create argc and argv for new usplash*/
430
569
int cmdline_argc = 0;
438
577
if(tmp == NULL){
439
578
perror("realloc");
440
579
free(cmdline_argv);
441
return EXIT_FAILURE;
580
return status;
442
581
}
443
582
cmdline_argv = tmp;
444
583
cmdline_argv[cmdline_argc] = cmdline + position;
454
593
kill(usplash_pid, SIGKILL);
455
594
sleep(1);
456
595
}
596
457
597
pid_t new_usplash_pid = fork();
458
598
if(new_usplash_pid == 0){
459
599
/* Child; will become new usplash process */
460
600
461
601
/* Make the effective user ID (root) the only user ID instead of
462
the real user ID (mandos) */
602
the real user ID (_mandos) */
463
603
ret = setuid(geteuid());
464
604
if(ret == -1){
465
605
perror("setuid");
473
613
ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
474
614
if(ret == -1){
475
615
perror("dup2");
476
_exit(EXIT_FAILURE);
616
_exit(EX_OSERR);
477
617
}
478
618
479
619
execv(usplash_name, cmdline_argv);
482
622
}
483
623
free(cmdline);
484
624
free(cmdline_argv);
485
_exit(EXIT_FAILURE);
625
_exit(EX_OSERR);
486
626
}
487
627
free(cmdline);
488
628
free(cmdline_argv);
489
629
sleep(2);
490
if(not usplash_write("PULSATE", NULL)
491
and (errno != EINTR)){
492
perror("usplash_write");
493
}
494
495
return EXIT_FAILURE;
630
if(not usplash_write(&fifo_fd, "PULSATE", NULL)){
631
if(errno != EINTR){
632
perror("usplash_write");
633
}
634
}
635
636
/* Close FIFO (again) */
637
if(fifo_fd != -1){
638
ret = (int)TEMP_FAILURE_RETRY(close(fifo_fd));
639
if(ret == -1 and errno != EINTR){
640
perror("close");
641
}
642
fifo_fd = -1;
643
}
644
645
if(interrupted_by_signal){
646
struct sigaction signal_action = { .sa_handler = SIG_DFL };
647
sigemptyset(&signal_action.sa_mask);
648
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
649
&signal_action, NULL));
650
if(ret == -1){
651
perror("sigaction");
652
}
653
do {
654
ret = raise(signal_received);
655
} while(ret != 0 and errno == EINTR);
656
if(ret != 0){
657
perror("raise");
658
abort();
659
}
660
TEMP_FAILURE_RETRY(pause());
661
}
662
663
return status;
496
664
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0