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- Committer: teddy at bsnet
- Date: 2010-09-08 19:25:13 UTC
- Revision ID: teddy@fukt.bsnet.se-20100908192513-ccso0jpam3qg4yze
* TODO: Clarifications.
- files added:
- NEWS
- files removed:
- debian/mandos-client.config
- files modified:
- .bzrignore
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(),
5
29
SIG_IGN, kill(), SIGKILL */
6
30
#include <stdbool.h> /* bool, false, true */
7
31
#include <fcntl.h> /* open(), O_WRONLY, O_RDONLY */
32
#include <iso646.h> /* and, or, not*/
8
33
#include <errno.h> /* errno, EINTR */
9
#include <sys/types.h> /* size_t, ssize_t, pid_t, DIR,
10
struct dirent */
34
#include <sys/types.h> /* size_t, ssize_t, pid_t, DIR, struct
35
dirent */
11
36
#include <stddef.h> /* NULL */
12
37
#include <string.h> /* strlen(), memcmp() */
13
38
#include <stdio.h> /* asprintf(), perror() */
16
41
fork(), setuid(), geteuid(),
17
42
setsid(), chdir(), dup2(),
18
43
STDERR_FILENO, execv() */
19
#include <stdlib.h> /* free(), EXIT_FAILURE, strtoul(),
20
realloc(), EXIT_SUCCESS, malloc(),
21
_exit() */
44
#include <stdlib.h> /* free(), EXIT_FAILURE, realloc(),
45
EXIT_SUCCESS, malloc(), _exit() */
22
46
#include <stdlib.h> /* getenv() */
23
47
#include <dirent.h> /* opendir(), readdir(), closedir() */
24
25
26
27
#include <iso646.h> /* and */
28
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
29
WEXITSTATUS() */
48
#include <inttypes.h> /* intmax_t, strtoimax() */
49
#include <sys/stat.h> /* struct stat, lstat(), S_ISLNK */
50
#include <sysexits.h> /* EX_OSERR, EX_UNAVAILABLE */
30
51
31
52
sig_atomic_t interrupted_by_signal = 0;
53
int signal_received;
54
const char usplash_name[] = "/sbin/usplash";
32
55
33
static void termination_handler(__attribute__((unused))int signum){
56
static void termination_handler(int signum){
57
if(interrupted_by_signal){
58
return;
59
}
34
60
interrupted_by_signal = 1;
61
signal_received = signum;
35
62
}
36
63
37
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){
38
66
/*
39
* usplash_write("TIMEOUT", "15"); -> "TIMEOUT 15\0"
40
* usplash_write("PULSATE", NULL); -> "PULSATE\0"
67
* usplash_write(&fd, "TIMEOUT", "15") will write "TIMEOUT 15\0"
68
* usplash_write(&fd, "PULSATE", NULL) will write "PULSATE\0"
41
69
* SEE ALSO
42
70
* usplash_write(8)
43
71
*/
44
72
int ret;
45
int fifo_fd;
46
do{
47
fifo_fd = open("/dev/.initramfs/usplash_fifo", O_WRONLY);
48
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){
49
76
return false;
50
77
}
51
}while(fifo_fd == -1);
78
*fifo_fd_r = ret;
79
}
52
80
53
81
const char *cmd_line;
54
82
size_t cmd_line_len;
55
83
char *cmd_line_alloc = NULL;
56
84
if(arg == NULL){
57
85
cmd_line = cmd;
58
cmd_line_len = strlen(cmd);
59
}else{
60
do{
86
cmd_line_len = strlen(cmd) + 1;
87
} else {
88
do {
61
89
ret = asprintf(&cmd_line_alloc, "%s %s", cmd, arg);
62
if(ret == -1 and (errno != EINTR or interrupted_by_signal)){
90
if(ret == -1){
63
91
int e = errno;
64
close(fifo_fd);
92
TEMP_FAILURE_RETRY(close(*fifo_fd_r));
65
93
errno = e;
66
94
return false;
67
95
}
68
}while(ret == -1);
96
} while(ret == -1);
69
97
cmd_line = cmd_line_alloc;
70
98
cmd_line_len = (size_t)ret + 1;
71
99
}
72
100
73
101
size_t written = 0;
74
while(not interrupted_by_signal and written < cmd_line_len){
75
ret = write(fifo_fd, cmd_line + written,
76
cmd_line_len - written);
77
if(ret == -1){
78
if(errno != EINTR or interrupted_by_signal){
79
int e = errno;
80
close(fifo_fd);
81
free(cmd_line_alloc);
82
errno = e;
83
return false;
84
} else {
85
continue;
86
}
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;
87
112
}
88
written += (size_t)ret;
113
written += (size_t)sret;
89
114
}
90
115
free(cmd_line_alloc);
91
do{
92
ret = close(fifo_fd);
93
if(ret == -1 and (errno != EINTR or interrupted_by_signal)){
94
return false;
95
}
96
}while(ret == -1);
97
if(interrupted_by_signal){
98
return false;
99
}
116
100
117
return true;
101
118
}
102
119
103
int main(__attribute__((unused))int argc,
104
__attribute__((unused))char **argv){
105
int ret = 0;
106
ssize_t sret;
107
bool an_error_occured = false;
108
109
/* Create prompt string */
110
char *prompt = NULL;
111
{
112
const char *const cryptsource = getenv("cryptsource");
113
const char *const crypttarget = getenv("crypttarget");
114
const char prompt_start[] = "Enter passphrase to unlock the disk";
115
116
if(cryptsource == NULL){
117
if(crypttarget == NULL){
118
ret = asprintf(&prompt, "%s: ", prompt_start);
119
} else {
120
ret = asprintf(&prompt, "%s (%s): ", prompt_start,
121
crypttarget);
122
}
123
} else {
124
if(crypttarget == NULL){
125
ret = asprintf(&prompt, "%s %s: ", prompt_start, cryptsource);
126
} else {
127
ret = asprintf(&prompt, "%s %s (%s): ", prompt_start,
128
cryptsource, crypttarget);
129
}
130
}
131
if(ret == -1){
132
return EXIT_FAILURE;
133
}
134
}
135
136
/* Find usplash process */
137
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;
138
152
char *cmdline = NULL;
139
153
size_t cmdline_len = 0;
140
const char usplash_name[] = "/sbin/usplash";
141
{
142
DIR *proc_dir = opendir("/proc");
143
if(proc_dir == NULL){
144
free(prompt);
145
perror("opendir");
146
return EXIT_FAILURE;
147
}
148
for(struct dirent *proc_ent = readdir(proc_dir);
149
proc_ent != NULL;
150
proc_ent = readdir(proc_dir)){
151
pid_t pid = (pid_t) strtoul(proc_ent->d_name, NULL, 10);
152
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){
153
170
/* Not a process */
154
continue;
155
}
156
/* Find the executable name by doing readlink() on the
157
/proc/<pid>/exe link */
158
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;
159
222
{
160
char *exe_link;
161
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);
162
226
if(ret == -1){
163
227
perror("asprintf");
164
free(prompt);
165
closedir(proc_dir);
166
return EXIT_FAILURE;
228
goto fail_find_usplash;
167
229
}
168
sret = readlink(exe_link, exe_target, sizeof(exe_target));
169
free(exe_link);
170
if(sret == -1){
171
continue;
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;
172
235
}
173
236
}
174
if((sret == ((ssize_t)sizeof(exe_target)-1))
175
and (memcmp(usplash_name, exe_target,
176
sizeof(exe_target)-1) == 0)){
177
usplash_pid = pid;
178
/* Read and save the command line of usplash in "cmdline" */
179
{
180
/* Open /proc/<pid>/cmdline */
181
int cl_fd;
182
{
183
char *cmdline_filename;
184
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
185
proc_ent->d_name);
186
if(ret == -1){
187
perror("asprintf");
188
free(prompt);
189
closedir(proc_dir);
190
return EXIT_FAILURE;
191
}
192
cl_fd = open(cmdline_filename, O_RDONLY);
193
if(cl_fd == -1){
194
perror("open");
195
free(cmdline_filename);
196
free(prompt);
197
closedir(proc_dir);
198
return EXIT_FAILURE;
199
}
200
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;
201
248
}
202
size_t cmdline_allocated = 0;
203
char *tmp;
204
const size_t blocksize = 1024;
205
do{
206
if(cmdline_len + blocksize > cmdline_allocated){
207
tmp = realloc(cmdline, cmdline_allocated + blocksize);
208
if(tmp == NULL){
209
perror("realloc");
210
free(cmdline);
211
free(prompt);
212
closedir(proc_dir);
213
return EXIT_FAILURE;
214
}
215
cmdline = tmp;
216
cmdline_allocated += blocksize;
217
}
218
sret = read(cl_fd, cmdline + cmdline_len,
219
cmdline_allocated - cmdline_len);
220
if(sret == -1){
221
perror("read");
222
free(cmdline);
223
free(prompt);
224
closedir(proc_dir);
225
return EXIT_FAILURE;
226
}
227
cmdline_len += (size_t)sret;
228
} 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");
229
257
close(cl_fd);
258
goto fail_find_usplash;
230
259
}
231
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;
232
266
}
233
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;
234
285
closedir(proc_dir);
235
}
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);
236
313
if(usplash_pid == 0){
237
free(prompt);
238
return EXIT_FAILURE;
314
status = EX_UNAVAILABLE;
315
goto failure;
239
316
}
240
317
241
318
/* Set up the signal handler */
244
321
new_action = { .sa_handler = termination_handler,
245
322
.sa_flags = 0 };
246
323
sigemptyset(&new_action.sa_mask);
247
sigaddset(&new_action.sa_mask, SIGINT);
248
sigaddset(&new_action.sa_mask, SIGHUP);
249
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
}
250
342
ret = sigaction(SIGINT, NULL, &old_action);
251
343
if(ret == -1){
252
perror("sigaction");
253
free(prompt);
254
return EXIT_FAILURE;
344
if(errno != EINTR){
345
perror("sigaction");
346
status = EX_OSERR;
347
}
348
goto failure;
255
349
}
256
if (old_action.sa_handler != SIG_IGN){
350
if(old_action.sa_handler != SIG_IGN){
257
351
ret = sigaction(SIGINT, &new_action, NULL);
258
352
if(ret == -1){
259
perror("sigaction");
260
free(prompt);
261
return EXIT_FAILURE;
353
if(errno != EINTR){
354
perror("sigaction");
355
status = EX_OSERR;
356
}
357
goto failure;
262
358
}
263
359
}
264
360
ret = sigaction(SIGHUP, NULL, &old_action);
265
361
if(ret == -1){
266
perror("sigaction");
267
free(prompt);
268
return EXIT_FAILURE;
362
if(errno != EINTR){
363
perror("sigaction");
364
status = EX_OSERR;
365
}
366
goto failure;
269
367
}
270
if (old_action.sa_handler != SIG_IGN){
368
if(old_action.sa_handler != SIG_IGN){
271
369
ret = sigaction(SIGHUP, &new_action, NULL);
272
370
if(ret == -1){
273
perror("sigaction");
274
free(prompt);
275
return EXIT_FAILURE;
371
if(errno != EINTR){
372
perror("sigaction");
373
status = EX_OSERR;
374
}
375
goto failure;
276
376
}
277
377
}
278
378
ret = sigaction(SIGTERM, NULL, &old_action);
279
379
if(ret == -1){
280
perror("sigaction");
281
free(prompt);
282
return EXIT_FAILURE;
380
if(errno != EINTR){
381
perror("sigaction");
382
status = EX_OSERR;
383
}
384
goto failure;
283
385
}
284
if (old_action.sa_handler != SIG_IGN){
386
if(old_action.sa_handler != SIG_IGN){
285
387
ret = sigaction(SIGTERM, &new_action, NULL);
286
388
if(ret == -1){
287
perror("sigaction");
288
free(prompt);
289
return EXIT_FAILURE;
389
if(errno != EINTR){
390
perror("sigaction");
391
status = EX_OSERR;
392
}
393
goto failure;
290
394
}
291
395
}
292
396
}
293
397
398
usplash_accessed = true;
294
399
/* Write command to FIFO */
295
if(not interrupted_by_signal){
296
if(not usplash_write("TIMEOUT", "0")
297
and (errno != EINTR)){
298
perror("usplash_write");
299
an_error_occured = true;
300
}
301
}
302
if(not interrupted_by_signal and not an_error_occured){
303
if(not usplash_write("INPUTQUIET", prompt)
304
and (errno != EINTR)){
305
perror("usplash_write");
306
an_error_occured = true;
307
}
308
}
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
309
424
free(prompt);
310
311
/* This is not really a loop; while() is used to be able to "break"
312
out of it; those breaks are marked "Big" */
313
while(not interrupted_by_signal and not an_error_occured){
314
char *buf = NULL;
315
size_t buf_len = 0;
316
317
/* Open FIFO */
318
int fifo_fd;
319
do{
320
fifo_fd = open("/dev/.initramfs/usplash_outfifo", O_RDONLY);
321
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){
322
450
if(errno != EINTR){
323
perror("open");
324
an_error_occured = true;
325
break;
326
}
327
if(interrupted_by_signal){
328
break;
329
}
330
}
331
}while(fifo_fd == -1);
332
if(interrupted_by_signal or an_error_occured){
333
break; /* Big */
334
}
335
336
/* Read from FIFO */
337
size_t buf_allocated = 0;
338
const size_t blocksize = 1024;
339
do{
340
if(buf_len + blocksize > buf_allocated){
341
char *tmp = realloc(buf, buf_allocated + blocksize);
342
if(tmp == NULL){
343
451
perror("realloc");
344
an_error_occured = true;
345
break;
346
}
347
buf = tmp;
348
buf_allocated += blocksize;
349
}
350
do{
351
sret = read(fifo_fd, buf + buf_len, buf_allocated - buf_len);
352
if(sret == -1){
353
if(errno != EINTR){
354
perror("read");
355
an_error_occured = true;
356
break;
357
}
358
if(interrupted_by_signal){
359
break;
360
}
361
}
362
}while(sret == -1);
363
if(interrupted_by_signal or an_error_occured){
364
break;
365
}
366
367
buf_len += (size_t)sret;
368
}while(sret != 0);
369
close(fifo_fd);
370
if(interrupted_by_signal or an_error_occured){
371
break; /* Big */
372
}
373
374
if(not usplash_write("TIMEOUT", "15")
375
and (errno != EINTR)){
376
perror("usplash_write");
377
an_error_occured = true;
378
}
379
if(interrupted_by_signal or an_error_occured){
380
break; /* Big */
381
}
382
383
/* Print password to stdout */
384
size_t written = 0;
385
while(written < buf_len){
386
do{
387
sret = write(STDOUT_FILENO, buf + written, buf_len - written);
388
if(sret == -1){
389
if(errno != EINTR){
390
perror("write");
391
an_error_occured = true;
392
break;
393
}
394
if(interrupted_by_signal){
395
break;
396
}
397
}
398
}while(sret == -1);
399
if(interrupted_by_signal or an_error_occured){
400
break;
401
}
402
written += (size_t)sret;
403
}
404
free(buf);
405
if(not interrupted_by_signal and not an_error_occured){
406
free(cmdline);
407
return EXIT_SUCCESS;
408
}
409
break; /* Big */
410
}
411
412
/* If we got here, an error or interrupt must have happened */
413
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
}
567
568
/* Create argc and argv for new usplash*/
414
569
int cmdline_argc = 0;
415
570
char **cmdline_argv = malloc(sizeof(char *));
416
/* Create argv and argc for new usplash*/
417
571
{
418
572
size_t position = 0;
419
573
while(position < cmdline_len){
423
577
if(tmp == NULL){
424
578
perror("realloc");
425
579
free(cmdline_argv);
426
return EXIT_FAILURE;
580
return status;
427
581
}
428
582
cmdline_argv = tmp;
429
583
cmdline_argv[cmdline_argc] = cmdline + position;
433
587
cmdline_argv[cmdline_argc] = NULL;
434
588
}
435
589
/* Kill old usplash */
436
kill(usplash_pid, SIGTERM);
437
sleep(2);
590
kill(usplash_pid, SIGTERM);
591
sleep(2);
438
592
while(kill(usplash_pid, 0) == 0){
439
593
kill(usplash_pid, SIGKILL);
440
594
sleep(1);
441
595
}
596
442
597
pid_t new_usplash_pid = fork();
443
598
if(new_usplash_pid == 0){
444
599
/* Child; will become new usplash process */
445
600
446
601
/* Make the effective user ID (root) the only user ID instead of
447
the real user ID (mandos) */
602
the real user ID (_mandos) */
448
603
ret = setuid(geteuid());
449
if (ret == -1){
604
if(ret == -1){
450
605
perror("setuid");
451
606
}
452
607
458
613
ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
459
614
if(ret == -1){
460
615
perror("dup2");
461
_exit(EXIT_FAILURE);
616
_exit(EX_OSERR);
462
617
}
463
618
464
619
execv(usplash_name, cmdline_argv);
465
perror("execv");
620
if(not interrupted_by_signal){
621
perror("execv");
622
}
466
623
free(cmdline);
467
624
free(cmdline_argv);
468
_exit(EXIT_FAILURE);
625
_exit(EX_OSERR);
469
626
}
470
627
free(cmdline);
471
628
free(cmdline_argv);
472
629
sleep(2);
473
if(not usplash_write("PULSATE", NULL)
474
and (errno != EINTR)){
475
perror("usplash_write");
476
}
477
478
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;
479
664
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0