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- Committer: Björn Påhlsson
- Date: 2010-09-12 18:23:40 UTC
- mfrom: (237.2.189 mandos)
- mto: (237.7.1 mandos)
- mto: This revision was merged to the branch mainline in revision 270.
- Revision ID: belorn@fukt.bsnet.se-20100912182340-09gzhdzd2a4zde5y
merge
added
removed
plugins.d/usplash.c
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(),
32
31
#include <fcntl.h> /* open(), O_WRONLY, O_RDONLY */
33
32
#include <iso646.h> /* and, or, not*/
34
33
#include <errno.h> /* errno, EINTR */
34
#include <error.h>
35
35
#include <sys/types.h> /* size_t, ssize_t, pid_t, DIR, struct
36
36
dirent */
37
37
#include <stddef.h> /* NULL */
38
38
#include <string.h> /* strlen(), memcmp() */
39
#include <stdio.h> /* asprintf(), perror() */
39
#include <stdio.h> /* asprintf()*/
40
40
#include <unistd.h> /* close(), write(), readlink(),
41
41
read(), STDOUT_FILENO, sleep(),
42
42
fork(), setuid(), geteuid(),
43
43
setsid(), chdir(), dup2(),
44
44
STDERR_FILENO, execv() */
45
45
#include <stdlib.h> /* free(), EXIT_FAILURE, realloc(),
46
EXIT_SUCCESS, malloc(), _exit() */
47
#include <stdlib.h> /* getenv() */
46
EXIT_SUCCESS, malloc(), _exit(),
47
getenv() */
48
48
#include <dirent.h> /* opendir(), readdir(), closedir() */
49
49
#include <inttypes.h> /* intmax_t, strtoimax() */
50
50
#include <sys/stat.h> /* struct stat, lstat(), S_ISLNK */
51
#include <sysexits.h> /* EX_OSERR, EX_UNAVAILABLE */
51
52
52
53
sig_atomic_t interrupted_by_signal = 0;
54
int signal_received;
55
const char usplash_name[] = "/sbin/usplash";
53
56
54
static void termination_handler(__attribute__((unused))int signum){
57
static void termination_handler(int signum){
58
if(interrupted_by_signal){
59
return;
60
}
55
61
interrupted_by_signal = 1;
62
signal_received = signum;
56
63
}
57
64
58
static bool usplash_write(const char *cmd, const char *arg){
65
static bool usplash_write(int *fifo_fd_r,
66
const char *cmd, const char *arg){
59
67
/*
60
* usplash_write("TIMEOUT", "15") will write "TIMEOUT 15\0"
61
* usplash_write("PULSATE", NULL) will write "PULSATE\0"
68
* usplash_write(&fd, "TIMEOUT", "15") will write "TIMEOUT 15\0"
69
* usplash_write(&fd, "PULSATE", NULL) will write "PULSATE\0"
62
70
* SEE ALSO
63
71
* usplash_write(8)
64
72
*/
65
73
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)){
74
if(*fifo_fd_r == -1){
75
ret = open("/dev/.initramfs/usplash_fifo", O_WRONLY);
76
if(ret == -1){
70
77
return false;
71
78
}
72
}while(fifo_fd == -1);
79
*fifo_fd_r = ret;
80
}
73
81
74
82
const char *cmd_line;
75
83
size_t cmd_line_len;
76
84
char *cmd_line_alloc = NULL;
77
85
if(arg == NULL){
78
86
cmd_line = cmd;
79
cmd_line_len = strlen(cmd);
80
}else{
81
do{
87
cmd_line_len = strlen(cmd) + 1;
88
} else {
89
do {
82
90
ret = asprintf(&cmd_line_alloc, "%s %s", cmd, arg);
83
if(ret == -1 and (errno != EINTR or interrupted_by_signal)){
91
if(ret == -1){
84
92
int e = errno;
85
close(fifo_fd);
93
TEMP_FAILURE_RETRY(close(*fifo_fd_r));
86
94
errno = e;
87
95
return false;
88
96
}
89
}while(ret == -1);
97
} while(ret == -1);
90
98
cmd_line = cmd_line_alloc;
91
99
cmd_line_len = (size_t)ret + 1;
92
100
}
93
101
94
102
size_t written = 0;
95
103
ssize_t sret = 0;
96
while(not interrupted_by_signal and written < cmd_line_len){
97
sret = write(fifo_fd, cmd_line + written,
104
while(written < cmd_line_len){
105
sret = write(*fifo_fd_r, cmd_line + written,
98
106
cmd_line_len - written);
99
107
if(sret == -1){
100
if(errno != EINTR or interrupted_by_signal){
101
int e = errno;
102
close(fifo_fd);
103
free(cmd_line_alloc);
104
errno = e;
105
return false;
106
} else {
107
continue;
108
}
108
int e = errno;
109
TEMP_FAILURE_RETRY(close(*fifo_fd_r));
110
free(cmd_line_alloc);
111
errno = e;
112
return false;
109
113
}
110
114
written += (size_t)sret;
111
115
}
112
116
free(cmd_line_alloc);
113
do{
114
ret = close(fifo_fd);
115
if(ret == -1 and (errno != EINTR or interrupted_by_signal)){
116
return false;
117
}
118
}while(ret == -1);
119
if(interrupted_by_signal){
120
return false;
121
}
117
122
118
return true;
123
119
}
124
120
121
/* Create prompt string */
122
char *makeprompt(void){
123
int ret = 0;
124
char *prompt;
125
const char *const cryptsource = getenv("cryptsource");
126
const char *const crypttarget = getenv("crypttarget");
127
const char prompt_start[] = "Enter passphrase to unlock the disk";
128
129
if(cryptsource == NULL){
130
if(crypttarget == NULL){
131
ret = asprintf(&prompt, "%s: ", prompt_start);
132
} else {
133
ret = asprintf(&prompt, "%s (%s): ", prompt_start,
134
crypttarget);
135
}
136
} else {
137
if(crypttarget == NULL){
138
ret = asprintf(&prompt, "%s %s: ", prompt_start, cryptsource);
139
} else {
140
ret = asprintf(&prompt, "%s %s (%s): ", prompt_start,
141
cryptsource, crypttarget);
142
}
143
}
144
if(ret == -1){
145
return NULL;
146
}
147
return prompt;
148
}
149
150
pid_t find_usplash(char **cmdline_r, size_t *cmdline_len_r){
151
int ret = 0;
152
ssize_t sret = 0;
153
char *cmdline = NULL;
154
size_t cmdline_len = 0;
155
DIR *proc_dir = opendir("/proc");
156
if(proc_dir == NULL){
157
error(0, errno, "opendir");
158
return -1;
159
}
160
errno = 0;
161
for(struct dirent *proc_ent = readdir(proc_dir);
162
proc_ent != NULL;
163
proc_ent = readdir(proc_dir)){
164
pid_t pid;
165
{
166
intmax_t tmpmax;
167
char *tmp;
168
tmpmax = strtoimax(proc_ent->d_name, &tmp, 10);
169
if(errno != 0 or tmp == proc_ent->d_name or *tmp != '\0'
170
or tmpmax != (pid_t)tmpmax){
171
/* Not a process */
172
errno = 0;
173
continue;
174
}
175
pid = (pid_t)tmpmax;
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
error(0, errno, "asprintf");
186
goto fail_find_usplash;
187
}
188
189
/* Check that it refers to a symlink owned by root:root */
190
struct stat exe_stat;
191
ret = lstat(exe_link, &exe_stat);
192
if(ret == -1){
193
if(errno == ENOENT){
194
free(exe_link);
195
continue;
196
}
197
error(0, errno, "lstat");
198
free(exe_link);
199
goto fail_find_usplash;
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
}
211
/* Compare executable name */
212
if((sret != ((ssize_t)sizeof(exe_target)-1))
213
or (memcmp(usplash_name, exe_target,
214
sizeof(exe_target)-1) != 0)){
215
/* Not it */
216
continue;
217
}
218
/* Found usplash */
219
/* Read and save the command line of usplash in "cmdline" */
220
{
221
/* Open /proc/<pid>/cmdline */
222
int cl_fd;
223
{
224
char *cmdline_filename;
225
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
226
proc_ent->d_name);
227
if(ret == -1){
228
error(0, errno, "asprintf");
229
goto fail_find_usplash;
230
}
231
cl_fd = open(cmdline_filename, O_RDONLY);
232
free(cmdline_filename);
233
if(cl_fd == -1){
234
error(0, errno, "open");
235
goto fail_find_usplash;
236
}
237
}
238
size_t cmdline_allocated = 0;
239
char *tmp;
240
const size_t blocksize = 1024;
241
do {
242
/* Allocate more space? */
243
if(cmdline_len + blocksize > cmdline_allocated){
244
tmp = realloc(cmdline, cmdline_allocated + blocksize);
245
if(tmp == NULL){
246
error(0, errno, "realloc");
247
close(cl_fd);
248
goto fail_find_usplash;
249
}
250
cmdline = tmp;
251
cmdline_allocated += blocksize;
252
}
253
/* Read data */
254
sret = read(cl_fd, cmdline + cmdline_len,
255
cmdline_allocated - cmdline_len);
256
if(sret == -1){
257
error(0, errno, "read");
258
close(cl_fd);
259
goto fail_find_usplash;
260
}
261
cmdline_len += (size_t)sret;
262
} while(sret != 0);
263
ret = close(cl_fd);
264
if(ret == -1){
265
error(0, errno, "close");
266
goto fail_find_usplash;
267
}
268
}
269
/* Close directory */
270
ret = closedir(proc_dir);
271
if(ret == -1){
272
error(0, errno, "closedir");
273
goto fail_find_usplash;
274
}
275
/* Success */
276
*cmdline_r = cmdline;
277
*cmdline_len_r = cmdline_len;
278
return pid;
279
}
280
281
fail_find_usplash:
282
283
free(cmdline);
284
if(proc_dir != NULL){
285
int e = errno;
286
closedir(proc_dir);
287
errno = e;
288
}
289
return 0;
290
}
291
125
292
int main(__attribute__((unused))int argc,
126
293
__attribute__((unused))char **argv){
127
294
int ret = 0;
128
295
ssize_t sret;
129
bool an_error_occured = false;
296
int fifo_fd = -1;
297
int outfifo_fd = -1;
298
char *buf = NULL;
299
size_t buf_len = 0;
300
pid_t usplash_pid = -1;
301
bool usplash_accessed = false;
302
int status = EXIT_FAILURE; /* Default failure exit status */
130
303
131
/* Create prompt string */
132
char *prompt = NULL;
133
{
134
const char *const cryptsource = getenv("cryptsource");
135
const char *const crypttarget = getenv("crypttarget");
136
const char prompt_start[] = "Enter passphrase to unlock the disk";
137
138
if(cryptsource == NULL){
139
if(crypttarget == NULL){
140
ret = asprintf(&prompt, "%s: ", prompt_start);
141
} else {
142
ret = asprintf(&prompt, "%s (%s): ", prompt_start,
143
crypttarget);
144
}
145
} else {
146
if(crypttarget == NULL){
147
ret = asprintf(&prompt, "%s %s: ", prompt_start, cryptsource);
148
} else {
149
ret = asprintf(&prompt, "%s %s (%s): ", prompt_start,
150
cryptsource, crypttarget);
151
}
152
}
153
if(ret == -1){
154
return EXIT_FAILURE;
155
}
304
char *prompt = makeprompt();
305
if(prompt == NULL){
306
status = EX_OSERR;
307
goto failure;
156
308
}
157
309
158
310
/* Find usplash process */
159
pid_t usplash_pid = 0;
160
311
char *cmdline = NULL;
161
312
size_t cmdline_len = 0;
162
const char usplash_name[] = "/sbin/usplash";
163
{
164
DIR *proc_dir = opendir("/proc");
165
if(proc_dir == NULL){
166
free(prompt);
167
perror("opendir");
168
return EXIT_FAILURE;
169
}
170
for(struct dirent *proc_ent = readdir(proc_dir);
171
proc_ent != NULL;
172
proc_ent = readdir(proc_dir)){
173
pid_t pid;
174
{
175
intmax_t tmpmax;
176
char *tmp;
177
errno = 0;
178
tmpmax = strtoimax(proc_ent->d_name, &tmp, 10);
179
if(errno != 0 or tmp == proc_ent->d_name or *tmp != '\0'
180
or tmpmax != (pid_t)tmpmax){
181
/* Not a process */
182
continue;
183
}
184
pid = (pid_t)tmpmax;
185
}
186
/* Find the executable name by doing readlink() on the
187
/proc/<pid>/exe link */
188
char exe_target[sizeof(usplash_name)];
189
{
190
/* create file name string */
191
char *exe_link;
192
ret = asprintf(&exe_link, "/proc/%s/exe", proc_ent->d_name);
193
if(ret == -1){
194
perror("asprintf");
195
free(prompt);
196
closedir(proc_dir);
197
return EXIT_FAILURE;
198
}
199
200
/* Check that it refers to a symlink owned by root:root */
201
struct stat exe_stat;
202
ret = lstat(exe_link, &exe_stat);
203
if(ret == -1){
204
if(errno == ENOENT){
205
free(exe_link);
206
continue;
207
}
208
perror("lstat");
209
free(exe_link);
210
free(prompt);
211
closedir(proc_dir);
212
return EXIT_FAILURE;
213
}
214
if(not S_ISLNK(exe_stat.st_mode)
215
or exe_stat.st_uid != 0
216
or exe_stat.st_gid != 0){
217
free(exe_link);
218
continue;
219
}
220
221
sret = readlink(exe_link, exe_target, sizeof(exe_target));
222
free(exe_link);
223
}
224
if((sret == ((ssize_t)sizeof(exe_target)-1))
225
and (memcmp(usplash_name, exe_target,
226
sizeof(exe_target)-1) == 0)){
227
usplash_pid = pid;
228
/* Read and save the command line of usplash in "cmdline" */
229
{
230
/* Open /proc/<pid>/cmdline */
231
int cl_fd;
232
{
233
char *cmdline_filename;
234
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
235
proc_ent->d_name);
236
if(ret == -1){
237
perror("asprintf");
238
free(prompt);
239
closedir(proc_dir);
240
return EXIT_FAILURE;
241
}
242
cl_fd = open(cmdline_filename, O_RDONLY);
243
if(cl_fd == -1){
244
perror("open");
245
free(cmdline_filename);
246
free(prompt);
247
closedir(proc_dir);
248
return EXIT_FAILURE;
249
}
250
free(cmdline_filename);
251
}
252
size_t cmdline_allocated = 0;
253
char *tmp;
254
const size_t blocksize = 1024;
255
do{
256
if(cmdline_len + blocksize > cmdline_allocated){
257
tmp = realloc(cmdline, cmdline_allocated + blocksize);
258
if(tmp == NULL){
259
perror("realloc");
260
free(cmdline);
261
free(prompt);
262
closedir(proc_dir);
263
return EXIT_FAILURE;
264
}
265
cmdline = tmp;
266
cmdline_allocated += blocksize;
267
}
268
sret = read(cl_fd, cmdline + cmdline_len,
269
cmdline_allocated - cmdline_len);
270
if(sret == -1){
271
perror("read");
272
free(cmdline);
273
free(prompt);
274
closedir(proc_dir);
275
return EXIT_FAILURE;
276
}
277
cmdline_len += (size_t)sret;
278
} while(sret != 0);
279
close(cl_fd);
280
}
281
break;
282
}
283
}
284
closedir(proc_dir);
285
}
313
usplash_pid = find_usplash(&cmdline, &cmdline_len);
286
314
if(usplash_pid == 0){
287
free(prompt);
288
return EXIT_FAILURE;
315
status = EX_UNAVAILABLE;
316
goto failure;
289
317
}
290
318
291
319
/* Set up the signal handler */
294
322
new_action = { .sa_handler = termination_handler,
295
323
.sa_flags = 0 };
296
324
sigemptyset(&new_action.sa_mask);
297
sigaddset(&new_action.sa_mask, SIGINT);
298
sigaddset(&new_action.sa_mask, SIGHUP);
299
sigaddset(&new_action.sa_mask, SIGTERM);
325
ret = sigaddset(&new_action.sa_mask, SIGINT);
326
if(ret == -1){
327
error(0, errno, "sigaddset");
328
status = EX_OSERR;
329
goto failure;
330
}
331
ret = sigaddset(&new_action.sa_mask, SIGHUP);
332
if(ret == -1){
333
error(0, errno, "sigaddset");
334
status = EX_OSERR;
335
goto failure;
336
}
337
ret = sigaddset(&new_action.sa_mask, SIGTERM);
338
if(ret == -1){
339
error(0, errno, "sigaddset");
340
status = EX_OSERR;
341
goto failure;
342
}
300
343
ret = sigaction(SIGINT, NULL, &old_action);
301
344
if(ret == -1){
302
perror("sigaction");
303
free(prompt);
304
return EXIT_FAILURE;
345
if(errno != EINTR){
346
error(0, errno, "sigaction");
347
status = EX_OSERR;
348
}
349
goto failure;
305
350
}
306
351
if(old_action.sa_handler != SIG_IGN){
307
352
ret = sigaction(SIGINT, &new_action, NULL);
308
353
if(ret == -1){
309
perror("sigaction");
310
free(prompt);
311
return EXIT_FAILURE;
354
if(errno != EINTR){
355
error(0, errno, "sigaction");
356
status = EX_OSERR;
357
}
358
goto failure;
312
359
}
313
360
}
314
361
ret = sigaction(SIGHUP, NULL, &old_action);
315
362
if(ret == -1){
316
perror("sigaction");
317
free(prompt);
318
return EXIT_FAILURE;
363
if(errno != EINTR){
364
error(0, errno, "sigaction");
365
status = EX_OSERR;
366
}
367
goto failure;
319
368
}
320
369
if(old_action.sa_handler != SIG_IGN){
321
370
ret = sigaction(SIGHUP, &new_action, NULL);
322
371
if(ret == -1){
323
perror("sigaction");
324
free(prompt);
325
return EXIT_FAILURE;
372
if(errno != EINTR){
373
error(0, errno, "sigaction");
374
status = EX_OSERR;
375
}
376
goto failure;
326
377
}
327
378
}
328
379
ret = sigaction(SIGTERM, NULL, &old_action);
329
380
if(ret == -1){
330
perror("sigaction");
331
free(prompt);
332
return EXIT_FAILURE;
381
if(errno != EINTR){
382
error(0, errno, "sigaction");
383
status = EX_OSERR;
384
}
385
goto failure;
333
386
}
334
387
if(old_action.sa_handler != SIG_IGN){
335
388
ret = sigaction(SIGTERM, &new_action, NULL);
336
389
if(ret == -1){
337
perror("sigaction");
338
free(prompt);
339
return EXIT_FAILURE;
390
if(errno != EINTR){
391
error(0, errno, "sigaction");
392
status = EX_OSERR;
393
}
394
goto failure;
340
395
}
341
396
}
342
397
}
343
398
399
usplash_accessed = true;
344
400
/* Write command to FIFO */
345
if(not interrupted_by_signal){
346
if(not usplash_write("TIMEOUT", "0")
347
and (errno != EINTR)){
348
perror("usplash_write");
349
an_error_occured = true;
350
}
351
}
352
if(not interrupted_by_signal and not an_error_occured){
353
if(not usplash_write("INPUTQUIET", prompt)
354
and (errno != EINTR)){
355
perror("usplash_write");
356
an_error_occured = true;
357
}
358
}
359
free(prompt);
360
361
/* This is not really a loop; while() is used to be able to "break"
362
out of it; those breaks are marked "Big" */
363
while(not interrupted_by_signal and not an_error_occured){
364
char *buf = NULL;
365
size_t buf_len = 0;
366
367
/* Open FIFO */
368
int fifo_fd;
369
do{
370
fifo_fd = open("/dev/.initramfs/usplash_outfifo", O_RDONLY);
371
if(fifo_fd == -1){
372
if(errno != EINTR){
373
perror("open");
374
an_error_occured = true;
375
break;
376
}
377
if(interrupted_by_signal){
378
break;
379
}
380
}
381
}while(fifo_fd == -1);
382
if(interrupted_by_signal or an_error_occured){
383
break; /* Big */
384
}
385
386
/* Read from FIFO */
387
size_t buf_allocated = 0;
388
const size_t blocksize = 1024;
389
do{
390
if(buf_len + blocksize > buf_allocated){
391
char *tmp = realloc(buf, buf_allocated + blocksize);
392
if(tmp == NULL){
393
perror("realloc");
394
an_error_occured = true;
395
break;
396
}
397
buf = tmp;
398
buf_allocated += blocksize;
399
}
400
do{
401
sret = read(fifo_fd, buf + buf_len, buf_allocated - buf_len);
402
if(sret == -1){
403
if(errno != EINTR){
404
perror("read");
405
an_error_occured = true;
406
break;
407
}
408
if(interrupted_by_signal){
409
break;
410
}
411
}
412
}while(sret == -1);
413
if(interrupted_by_signal or an_error_occured){
414
break;
415
}
416
417
buf_len += (size_t)sret;
418
}while(sret != 0);
419
close(fifo_fd);
420
if(interrupted_by_signal or an_error_occured){
421
break; /* Big */
422
}
423
424
if(not usplash_write("TIMEOUT", "15")
425
and (errno != EINTR)){
426
perror("usplash_write");
427
an_error_occured = true;
428
}
429
if(interrupted_by_signal or an_error_occured){
430
break; /* Big */
431
}
432
433
/* Print password to stdout */
434
size_t written = 0;
435
while(written < buf_len){
436
do{
437
sret = write(STDOUT_FILENO, buf + written, buf_len - written);
438
if(sret == -1){
439
if(errno != EINTR){
440
perror("write");
441
an_error_occured = true;
442
break;
443
}
444
if(interrupted_by_signal){
445
break;
446
}
447
}
448
}while(sret == -1);
449
if(interrupted_by_signal or an_error_occured){
450
break;
451
}
452
written += (size_t)sret;
453
}
454
free(buf);
455
if(not interrupted_by_signal and not an_error_occured){
456
free(cmdline);
457
return EXIT_SUCCESS;
458
}
459
break; /* Big */
460
} /* end of non-loop while() */
461
462
/* If we got here, an error or interrupt must have happened */
401
if(not usplash_write(&fifo_fd, "TIMEOUT", "0")){
402
if(errno != EINTR){
403
error(0, errno, "usplash_write");
404
status = EX_OSERR;
405
}
406
goto failure;
407
}
408
409
if(interrupted_by_signal){
410
goto failure;
411
}
412
413
if(not usplash_write(&fifo_fd, "INPUTQUIET", prompt)){
414
if(errno != EINTR){
415
error(0, errno, "usplash_write");
416
status = EX_OSERR;
417
}
418
goto failure;
419
}
420
421
if(interrupted_by_signal){
422
goto failure;
423
}
424
425
free(prompt);
426
prompt = NULL;
427
428
/* Read reply from usplash */
429
/* Open FIFO */
430
outfifo_fd = open("/dev/.initramfs/usplash_outfifo", O_RDONLY);
431
if(outfifo_fd == -1){
432
if(errno != EINTR){
433
error(0, errno, "open");
434
status = EX_OSERR;
435
}
436
goto failure;
437
}
438
439
if(interrupted_by_signal){
440
goto failure;
441
}
442
443
/* Read from FIFO */
444
size_t buf_allocated = 0;
445
const size_t blocksize = 1024;
446
do {
447
/* Allocate more space */
448
if(buf_len + blocksize > buf_allocated){
449
char *tmp = realloc(buf, buf_allocated + blocksize);
450
if(tmp == NULL){
451
if(errno != EINTR){
452
error(0, errno, "realloc");
453
status = EX_OSERR;
454
}
455
goto failure;
456
}
457
buf = tmp;
458
buf_allocated += blocksize;
459
}
460
sret = read(outfifo_fd, buf + buf_len,
461
buf_allocated - buf_len);
462
if(sret == -1){
463
if(errno != EINTR){
464
error(0, errno, "read");
465
status = EX_OSERR;
466
}
467
TEMP_FAILURE_RETRY(close(outfifo_fd));
468
goto failure;
469
}
470
if(interrupted_by_signal){
471
break;
472
}
473
474
buf_len += (size_t)sret;
475
} while(sret != 0);
476
ret = close(outfifo_fd);
477
if(ret == -1){
478
if(errno != EINTR){
479
error(0, errno, "close");
480
status = EX_OSERR;
481
}
482
goto failure;
483
}
484
outfifo_fd = -1;
485
486
if(interrupted_by_signal){
487
goto failure;
488
}
489
490
if(not usplash_write(&fifo_fd, "TIMEOUT", "15")){
491
if(errno != EINTR){
492
error(0, errno, "usplash_write");
493
status = EX_OSERR;
494
}
495
goto failure;
496
}
497
498
if(interrupted_by_signal){
499
goto failure;
500
}
501
502
ret = close(fifo_fd);
503
if(ret == -1){
504
if(errno != EINTR){
505
error(0, errno, "close");
506
status = EX_OSERR;
507
}
508
goto failure;
509
}
510
fifo_fd = -1;
511
512
/* Print password to stdout */
513
size_t written = 0;
514
while(written < buf_len){
515
do {
516
sret = write(STDOUT_FILENO, buf + written, buf_len - written);
517
if(sret == -1){
518
if(errno != EINTR){
519
error(0, errno, "write");
520
status = EX_OSERR;
521
}
522
goto failure;
523
}
524
} while(sret == -1);
525
526
if(interrupted_by_signal){
527
goto failure;
528
}
529
written += (size_t)sret;
530
}
531
free(buf);
532
buf = NULL;
533
534
if(interrupted_by_signal){
535
goto failure;
536
}
537
538
free(cmdline);
539
return EXIT_SUCCESS;
540
541
failure:
542
543
free(buf);
544
545
free(prompt);
546
547
/* If usplash was never accessed, we can stop now */
548
if(not usplash_accessed){
549
return status;
550
}
551
552
/* Close FIFO */
553
if(fifo_fd != -1){
554
ret = (int)TEMP_FAILURE_RETRY(close(fifo_fd));
555
if(ret == -1 and errno != EINTR){
556
error(0, errno, "close");
557
}
558
fifo_fd = -1;
559
}
560
561
/* Close output FIFO */
562
if(outfifo_fd != -1){
563
ret = (int)TEMP_FAILURE_RETRY(close(outfifo_fd));
564
if(ret == -1){
565
error(0, errno, "close");
566
}
567
}
463
568
464
569
/* Create argc and argv for new usplash*/
465
570
int cmdline_argc = 0;
471
576
(sizeof(char *)
472
577
* (size_t)(cmdline_argc + 2)));
473
578
if(tmp == NULL){
474
perror("realloc");
579
error(0, errno, "realloc");
475
580
free(cmdline_argv);
476
return EXIT_FAILURE;
581
return status;
477
582
}
478
583
cmdline_argv = tmp;
479
584
cmdline_argv[cmdline_argc] = cmdline + position;
489
594
kill(usplash_pid, SIGKILL);
490
595
sleep(1);
491
596
}
597
492
598
pid_t new_usplash_pid = fork();
493
599
if(new_usplash_pid == 0){
494
600
/* Child; will become new usplash process */
497
603
the real user ID (_mandos) */
498
604
ret = setuid(geteuid());
499
605
if(ret == -1){
500
perror("setuid");
606
error(0, errno, "setuid");
501
607
}
502
608
503
609
setsid();
504
610
ret = chdir("/");
611
if(ret == -1){
612
error(0, errno, "chdir");
613
_exit(EX_OSERR);
614
}
505
615
/* if(fork() != 0){ */
506
616
/* _exit(EXIT_SUCCESS); */
507
617
/* } */
508
618
ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
509
619
if(ret == -1){
510
perror("dup2");
511
_exit(EXIT_FAILURE);
620
error(0, errno, "dup2");
621
_exit(EX_OSERR);
512
622
}
513
623
514
624
execv(usplash_name, cmdline_argv);
515
625
if(not interrupted_by_signal){
516
perror("execv");
626
error(0, errno, "execv");
517
627
}
518
628
free(cmdline);
519
629
free(cmdline_argv);
520
_exit(EXIT_FAILURE);
630
_exit(EX_OSERR);
521
631
}
522
632
free(cmdline);
523
633
free(cmdline_argv);
524
634
sleep(2);
525
if(not usplash_write("PULSATE", NULL)
526
and (errno != EINTR)){
527
perror("usplash_write");
528
}
529
530
return EXIT_FAILURE;
635
if(not usplash_write(&fifo_fd, "PULSATE", NULL)){
636
if(errno != EINTR){
637
error(0, errno, "usplash_write");
638
}
639
}
640
641
/* Close FIFO (again) */
642
if(fifo_fd != -1){
643
ret = (int)TEMP_FAILURE_RETRY(close(fifo_fd));
644
if(ret == -1 and errno != EINTR){
645
error(0, errno, "close");
646
}
647
fifo_fd = -1;
648
}
649
650
if(interrupted_by_signal){
651
struct sigaction signal_action = { .sa_handler = SIG_DFL };
652
sigemptyset(&signal_action.sa_mask);
653
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
654
&signal_action, NULL));
655
if(ret == -1){
656
error(0, errno, "sigaction");
657
}
658
do {
659
ret = raise(signal_received);
660
} while(ret != 0 and errno == EINTR);
661
if(ret != 0){
662
error(0, errno, "raise");
663
abort();
664
}
665
TEMP_FAILURE_RETRY(pause());
666
}
667
668
return status;
531
669
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0