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- Committer: Björn Påhlsson
- Date: 2011-02-27 15:45:24 UTC
- mto: (237.7.15 mandos)
- mto: This revision was merged to the branch mainline in revision 282.
- Revision ID: belorn@fukt.bsnet.se-20110227154524-zac8443jod8v1g1g
fixed bug with conflict detection between plymouthd and password-prompt
- files added:
- DBUS-API
- debian/source
- files renamed:
- mandos-list => mandos-ctl
- files modified:
- .bzrignore
added
removed
plugins.d/usplash.c
2
2
/*
3
3
* Usplash - Read a password from usplash and output it
4
4
*
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
5
* Copyright © 2008-2010 Teddy Hogeborn
6
* Copyright © 2008-2010 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(),
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
#include <stdlib.h> /* free(), EXIT_FAILURE, strtoul(),
46
realloc(), EXIT_SUCCESS, malloc(),
47
_exit() */
48
#include <stdlib.h> /* getenv() */
45
#include <stdlib.h> /* free(), EXIT_FAILURE, realloc(),
46
EXIT_SUCCESS, malloc(), _exit(),
47
getenv() */
49
48
#include <dirent.h> /* opendir(), readdir(), closedir() */
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 */
52
#include <argz.h> /* argz_count(), argz_extract() */
51
53
52
54
sig_atomic_t interrupted_by_signal = 0;
55
int signal_received;
56
const char usplash_name[] = "/sbin/usplash";
53
57
54
static void termination_handler(__attribute__((unused))int signum){
58
static void termination_handler(int signum){
59
if(interrupted_by_signal){
60
return;
61
}
55
62
interrupted_by_signal = 1;
63
signal_received = signum;
56
64
}
57
65
58
static bool usplash_write(const char *cmd, const char *arg){
66
static bool usplash_write(int *fifo_fd_r,
67
const char *cmd, const char *arg){
59
68
/*
60
* usplash_write("TIMEOUT", "15") will write "TIMEOUT 15\0"
61
* usplash_write("PULSATE", NULL) will write "PULSATE\0"
69
* usplash_write(&fd, "TIMEOUT", "15") will write "TIMEOUT 15\0"
70
* usplash_write(&fd, "PULSATE", NULL) will write "PULSATE\0"
62
71
* SEE ALSO
63
72
* usplash_write(8)
64
73
*/
65
74
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)){
75
if(*fifo_fd_r == -1){
76
ret = open("/dev/.initramfs/usplash_fifo", O_WRONLY);
77
if(ret == -1){
70
78
return false;
71
79
}
72
}while(fifo_fd == -1);
80
*fifo_fd_r = ret;
81
}
73
82
74
83
const char *cmd_line;
75
84
size_t cmd_line_len;
76
85
char *cmd_line_alloc = NULL;
77
86
if(arg == NULL){
78
87
cmd_line = cmd;
79
cmd_line_len = strlen(cmd);
80
}else{
81
do{
88
cmd_line_len = strlen(cmd) + 1;
89
} else {
90
do {
82
91
ret = asprintf(&cmd_line_alloc, "%s %s", cmd, arg);
83
if(ret == -1 and (errno != EINTR or interrupted_by_signal)){
92
if(ret == -1){
84
93
int e = errno;
85
close(fifo_fd);
94
TEMP_FAILURE_RETRY(close(*fifo_fd_r));
86
95
errno = e;
87
96
return false;
88
97
}
89
}while(ret == -1);
98
} while(ret == -1);
90
99
cmd_line = cmd_line_alloc;
91
100
cmd_line_len = (size_t)ret + 1;
92
101
}
93
102
94
103
size_t written = 0;
95
104
ssize_t sret = 0;
96
while(not interrupted_by_signal and written < cmd_line_len){
97
sret = write(fifo_fd, cmd_line + written,
105
while(written < cmd_line_len){
106
sret = write(*fifo_fd_r, cmd_line + written,
98
107
cmd_line_len - written);
99
108
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
}
109
int e = errno;
110
TEMP_FAILURE_RETRY(close(*fifo_fd_r));
111
free(cmd_line_alloc);
112
errno = e;
113
return false;
109
114
}
110
115
written += (size_t)sret;
111
116
}
112
117
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
}
118
122
119
return true;
123
120
}
124
121
122
/* Create prompt string */
123
char *makeprompt(void){
124
int ret = 0;
125
char *prompt;
126
const char *const cryptsource = getenv("cryptsource");
127
const char *const crypttarget = getenv("crypttarget");
128
const char prompt_start[] = "Enter passphrase to unlock the disk";
129
130
if(cryptsource == NULL){
131
if(crypttarget == NULL){
132
ret = asprintf(&prompt, "%s: ", prompt_start);
133
} else {
134
ret = asprintf(&prompt, "%s (%s): ", prompt_start,
135
crypttarget);
136
}
137
} else {
138
if(crypttarget == NULL){
139
ret = asprintf(&prompt, "%s %s: ", prompt_start, cryptsource);
140
} else {
141
ret = asprintf(&prompt, "%s %s (%s): ", prompt_start,
142
cryptsource, crypttarget);
143
}
144
}
145
if(ret == -1){
146
return NULL;
147
}
148
return prompt;
149
}
150
151
pid_t find_usplash(char **cmdline_r, size_t *cmdline_len_r){
152
int ret = 0;
153
ssize_t sret = 0;
154
char *cmdline = NULL;
155
size_t cmdline_len = 0;
156
DIR *proc_dir = opendir("/proc");
157
if(proc_dir == NULL){
158
error(0, errno, "opendir");
159
return -1;
160
}
161
errno = 0;
162
for(struct dirent *proc_ent = readdir(proc_dir);
163
proc_ent != NULL;
164
proc_ent = readdir(proc_dir)){
165
pid_t pid;
166
{
167
intmax_t tmpmax;
168
char *tmp;
169
tmpmax = strtoimax(proc_ent->d_name, &tmp, 10);
170
if(errno != 0 or tmp == proc_ent->d_name or *tmp != '\0'
171
or tmpmax != (pid_t)tmpmax){
172
/* Not a process */
173
errno = 0;
174
continue;
175
}
176
pid = (pid_t)tmpmax;
177
}
178
/* Find the executable name by doing readlink() on the
179
/proc/<pid>/exe link */
180
char exe_target[sizeof(usplash_name)];
181
{
182
/* create file name string */
183
char *exe_link;
184
ret = asprintf(&exe_link, "/proc/%s/exe", proc_ent->d_name);
185
if(ret == -1){
186
error(0, errno, "asprintf");
187
goto fail_find_usplash;
188
}
189
190
/* Check that it refers to a symlink owned by root:root */
191
struct stat exe_stat;
192
ret = lstat(exe_link, &exe_stat);
193
if(ret == -1){
194
if(errno == ENOENT){
195
free(exe_link);
196
continue;
197
}
198
error(0, errno, "lstat");
199
free(exe_link);
200
goto fail_find_usplash;
201
}
202
if(not S_ISLNK(exe_stat.st_mode)
203
or exe_stat.st_uid != 0
204
or exe_stat.st_gid != 0){
205
free(exe_link);
206
continue;
207
}
208
209
sret = readlink(exe_link, exe_target, sizeof(exe_target));
210
free(exe_link);
211
}
212
/* Compare executable name */
213
if((sret != ((ssize_t)sizeof(exe_target)-1))
214
or (memcmp(usplash_name, exe_target,
215
sizeof(exe_target)-1) != 0)){
216
/* Not it */
217
continue;
218
}
219
/* Found usplash */
220
/* Read and save the command line of usplash in "cmdline" */
221
{
222
/* Open /proc/<pid>/cmdline */
223
int cl_fd;
224
{
225
char *cmdline_filename;
226
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
227
proc_ent->d_name);
228
if(ret == -1){
229
error(0, errno, "asprintf");
230
goto fail_find_usplash;
231
}
232
cl_fd = open(cmdline_filename, O_RDONLY);
233
free(cmdline_filename);
234
if(cl_fd == -1){
235
error(0, errno, "open");
236
goto fail_find_usplash;
237
}
238
}
239
size_t cmdline_allocated = 0;
240
char *tmp;
241
const size_t blocksize = 1024;
242
do {
243
/* Allocate more space? */
244
if(cmdline_len + blocksize > cmdline_allocated){
245
tmp = realloc(cmdline, cmdline_allocated + blocksize);
246
if(tmp == NULL){
247
error(0, errno, "realloc");
248
close(cl_fd);
249
goto fail_find_usplash;
250
}
251
cmdline = tmp;
252
cmdline_allocated += blocksize;
253
}
254
/* Read data */
255
sret = read(cl_fd, cmdline + cmdline_len,
256
cmdline_allocated - cmdline_len);
257
if(sret == -1){
258
error(0, errno, "read");
259
close(cl_fd);
260
goto fail_find_usplash;
261
}
262
cmdline_len += (size_t)sret;
263
} while(sret != 0);
264
ret = close(cl_fd);
265
if(ret == -1){
266
error(0, errno, "close");
267
goto fail_find_usplash;
268
}
269
}
270
/* Close directory */
271
ret = closedir(proc_dir);
272
if(ret == -1){
273
error(0, errno, "closedir");
274
goto fail_find_usplash;
275
}
276
/* Success */
277
*cmdline_r = cmdline;
278
*cmdline_len_r = cmdline_len;
279
return pid;
280
}
281
282
fail_find_usplash:
283
284
free(cmdline);
285
if(proc_dir != NULL){
286
int e = errno;
287
closedir(proc_dir);
288
errno = e;
289
}
290
return 0;
291
}
292
125
293
int main(__attribute__((unused))int argc,
126
294
__attribute__((unused))char **argv){
127
295
int ret = 0;
128
296
ssize_t sret;
129
bool an_error_occured = false;
297
int fifo_fd = -1;
298
int outfifo_fd = -1;
299
char *buf = NULL;
300
size_t buf_len = 0;
301
pid_t usplash_pid = -1;
302
bool usplash_accessed = false;
303
int status = EXIT_FAILURE; /* Default failure exit status */
130
304
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
}
305
char *prompt = makeprompt();
306
if(prompt == NULL){
307
status = EX_OSERR;
308
goto failure;
156
309
}
157
310
158
311
/* Find usplash process */
159
pid_t usplash_pid = 0;
160
312
char *cmdline = NULL;
161
313
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 = (pid_t) strtoul(proc_ent->d_name, NULL, 10);
174
if(pid == 0){
175
/* Not a process */
176
continue;
177
}
178
/* Find the executable name by doing readlink() on the
179
/proc/<pid>/exe link */
180
char exe_target[sizeof(usplash_name)];
181
{
182
/* create file name string */
183
char *exe_link;
184
ret = asprintf(&exe_link, "/proc/%s/exe", proc_ent->d_name);
185
if(ret == -1){
186
perror("asprintf");
187
free(prompt);
188
closedir(proc_dir);
189
return EXIT_FAILURE;
190
}
191
192
/* Check that it refers to a symlink owned by root:root */
193
struct stat exe_stat;
194
ret = lstat(exe_link, &exe_stat);
195
if(ret == -1){
196
if(errno == ENOENT){
197
free(exe_link);
198
continue;
199
}
200
perror("lstat");
201
free(exe_link);
202
free(prompt);
203
closedir(proc_dir);
204
return EXIT_FAILURE;
205
}
206
if(not S_ISLNK(exe_stat.st_mode)
207
or exe_stat.st_uid != 0
208
or exe_stat.st_gid != 0){
209
free(exe_link);
210
continue;
211
}
212
213
sret = readlink(exe_link, exe_target, sizeof(exe_target));
214
free(exe_link);
215
}
216
if((sret == ((ssize_t)sizeof(exe_target)-1))
217
and (memcmp(usplash_name, exe_target,
218
sizeof(exe_target)-1) == 0)){
219
usplash_pid = pid;
220
/* Read and save the command line of usplash in "cmdline" */
221
{
222
/* Open /proc/<pid>/cmdline */
223
int cl_fd;
224
{
225
char *cmdline_filename;
226
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
227
proc_ent->d_name);
228
if(ret == -1){
229
perror("asprintf");
230
free(prompt);
231
closedir(proc_dir);
232
return EXIT_FAILURE;
233
}
234
cl_fd = open(cmdline_filename, O_RDONLY);
235
if(cl_fd == -1){
236
perror("open");
237
free(cmdline_filename);
238
free(prompt);
239
closedir(proc_dir);
240
return EXIT_FAILURE;
241
}
242
free(cmdline_filename);
243
}
244
size_t cmdline_allocated = 0;
245
char *tmp;
246
const size_t blocksize = 1024;
247
do{
248
if(cmdline_len + blocksize > cmdline_allocated){
249
tmp = realloc(cmdline, cmdline_allocated + blocksize);
250
if(tmp == NULL){
251
perror("realloc");
252
free(cmdline);
253
free(prompt);
254
closedir(proc_dir);
255
return EXIT_FAILURE;
256
}
257
cmdline = tmp;
258
cmdline_allocated += blocksize;
259
}
260
sret = read(cl_fd, cmdline + cmdline_len,
261
cmdline_allocated - cmdline_len);
262
if(sret == -1){
263
perror("read");
264
free(cmdline);
265
free(prompt);
266
closedir(proc_dir);
267
return EXIT_FAILURE;
268
}
269
cmdline_len += (size_t)sret;
270
} while(sret != 0);
271
close(cl_fd);
272
}
273
break;
274
}
275
}
276
closedir(proc_dir);
277
}
314
usplash_pid = find_usplash(&cmdline, &cmdline_len);
278
315
if(usplash_pid == 0){
279
free(prompt);
280
return EXIT_FAILURE;
316
status = EX_UNAVAILABLE;
317
goto failure;
281
318
}
282
319
283
320
/* Set up the signal handler */
286
323
new_action = { .sa_handler = termination_handler,
287
324
.sa_flags = 0 };
288
325
sigemptyset(&new_action.sa_mask);
289
sigaddset(&new_action.sa_mask, SIGINT);
290
sigaddset(&new_action.sa_mask, SIGHUP);
291
sigaddset(&new_action.sa_mask, SIGTERM);
326
ret = sigaddset(&new_action.sa_mask, SIGINT);
327
if(ret == -1){
328
error(0, errno, "sigaddset");
329
status = EX_OSERR;
330
goto failure;
331
}
332
ret = sigaddset(&new_action.sa_mask, SIGHUP);
333
if(ret == -1){
334
error(0, errno, "sigaddset");
335
status = EX_OSERR;
336
goto failure;
337
}
338
ret = sigaddset(&new_action.sa_mask, SIGTERM);
339
if(ret == -1){
340
error(0, errno, "sigaddset");
341
status = EX_OSERR;
342
goto failure;
343
}
292
344
ret = sigaction(SIGINT, NULL, &old_action);
293
345
if(ret == -1){
294
perror("sigaction");
295
free(prompt);
296
return EXIT_FAILURE;
346
if(errno != EINTR){
347
error(0, errno, "sigaction");
348
status = EX_OSERR;
349
}
350
goto failure;
297
351
}
298
352
if(old_action.sa_handler != SIG_IGN){
299
353
ret = sigaction(SIGINT, &new_action, NULL);
300
354
if(ret == -1){
301
perror("sigaction");
302
free(prompt);
303
return EXIT_FAILURE;
355
if(errno != EINTR){
356
error(0, errno, "sigaction");
357
status = EX_OSERR;
358
}
359
goto failure;
304
360
}
305
361
}
306
362
ret = sigaction(SIGHUP, NULL, &old_action);
307
363
if(ret == -1){
308
perror("sigaction");
309
free(prompt);
310
return EXIT_FAILURE;
364
if(errno != EINTR){
365
error(0, errno, "sigaction");
366
status = EX_OSERR;
367
}
368
goto failure;
311
369
}
312
370
if(old_action.sa_handler != SIG_IGN){
313
371
ret = sigaction(SIGHUP, &new_action, NULL);
314
372
if(ret == -1){
315
perror("sigaction");
316
free(prompt);
317
return EXIT_FAILURE;
373
if(errno != EINTR){
374
error(0, errno, "sigaction");
375
status = EX_OSERR;
376
}
377
goto failure;
318
378
}
319
379
}
320
380
ret = sigaction(SIGTERM, NULL, &old_action);
321
381
if(ret == -1){
322
perror("sigaction");
323
free(prompt);
324
return EXIT_FAILURE;
382
if(errno != EINTR){
383
error(0, errno, "sigaction");
384
status = EX_OSERR;
385
}
386
goto failure;
325
387
}
326
388
if(old_action.sa_handler != SIG_IGN){
327
389
ret = sigaction(SIGTERM, &new_action, NULL);
328
390
if(ret == -1){
329
perror("sigaction");
330
free(prompt);
331
return EXIT_FAILURE;
391
if(errno != EINTR){
392
error(0, errno, "sigaction");
393
status = EX_OSERR;
394
}
395
goto failure;
332
396
}
333
397
}
334
398
}
335
399
400
usplash_accessed = true;
336
401
/* Write command to FIFO */
337
if(not interrupted_by_signal){
338
if(not usplash_write("TIMEOUT", "0")
339
and (errno != EINTR)){
340
perror("usplash_write");
341
an_error_occured = true;
342
}
343
}
344
if(not interrupted_by_signal and not an_error_occured){
345
if(not usplash_write("INPUTQUIET", prompt)
346
and (errno != EINTR)){
347
perror("usplash_write");
348
an_error_occured = true;
349
}
350
}
402
if(not usplash_write(&fifo_fd, "TIMEOUT", "0")){
403
if(errno != EINTR){
404
error(0, errno, "usplash_write");
405
status = EX_OSERR;
406
}
407
goto failure;
408
}
409
410
if(interrupted_by_signal){
411
goto failure;
412
}
413
414
if(not usplash_write(&fifo_fd, "INPUTQUIET", prompt)){
415
if(errno != EINTR){
416
error(0, errno, "usplash_write");
417
status = EX_OSERR;
418
}
419
goto failure;
420
}
421
422
if(interrupted_by_signal){
423
goto failure;
424
}
425
351
426
free(prompt);
352
353
/* This is not really a loop; while() is used to be able to "break"
354
out of it; those breaks are marked "Big" */
355
while(not interrupted_by_signal and not an_error_occured){
356
char *buf = NULL;
357
size_t buf_len = 0;
358
359
/* Open FIFO */
360
int fifo_fd;
361
do{
362
fifo_fd = open("/dev/.initramfs/usplash_outfifo", O_RDONLY);
363
if(fifo_fd == -1){
364
if(errno != EINTR){
365
perror("open");
366
an_error_occured = true;
367
break;
368
}
369
if(interrupted_by_signal){
370
break;
371
}
372
}
373
}while(fifo_fd == -1);
374
if(interrupted_by_signal or an_error_occured){
375
break; /* Big */
376
}
377
378
/* Read from FIFO */
379
size_t buf_allocated = 0;
380
const size_t blocksize = 1024;
381
do{
382
if(buf_len + blocksize > buf_allocated){
383
char *tmp = realloc(buf, buf_allocated + blocksize);
384
if(tmp == NULL){
385
perror("realloc");
386
an_error_occured = true;
387
break;
388
}
389
buf = tmp;
390
buf_allocated += blocksize;
391
}
392
do{
393
sret = read(fifo_fd, buf + buf_len, buf_allocated - buf_len);
394
if(sret == -1){
395
if(errno != EINTR){
396
perror("read");
397
an_error_occured = true;
398
break;
399
}
400
if(interrupted_by_signal){
401
break;
402
}
403
}
404
}while(sret == -1);
405
if(interrupted_by_signal or an_error_occured){
406
break;
407
}
408
409
buf_len += (size_t)sret;
410
}while(sret != 0);
411
close(fifo_fd);
412
if(interrupted_by_signal or an_error_occured){
413
break; /* Big */
414
}
415
416
if(not usplash_write("TIMEOUT", "15")
417
and (errno != EINTR)){
418
perror("usplash_write");
419
an_error_occured = true;
420
}
421
if(interrupted_by_signal or an_error_occured){
422
break; /* Big */
423
}
424
425
/* Print password to stdout */
426
size_t written = 0;
427
while(written < buf_len){
428
do{
429
sret = write(STDOUT_FILENO, buf + written, buf_len - written);
430
if(sret == -1){
431
if(errno != EINTR){
432
perror("write");
433
an_error_occured = true;
434
break;
435
}
436
if(interrupted_by_signal){
437
break;
438
}
439
}
440
}while(sret == -1);
441
if(interrupted_by_signal or an_error_occured){
442
break;
443
}
444
written += (size_t)sret;
445
}
446
free(buf);
447
if(not interrupted_by_signal and not an_error_occured){
448
free(cmdline);
449
return EXIT_SUCCESS;
450
}
451
break; /* Big */
452
} /* end of non-loop while() */
453
454
/* If we got here, an error or interrupt must have happened */
455
456
/* Create argc and argv for new usplash*/
457
int cmdline_argc = 0;
458
char **cmdline_argv = malloc(sizeof(char *));
459
{
460
size_t position = 0;
461
while(position < cmdline_len){
462
char **tmp = realloc(cmdline_argv,
463
(sizeof(char *)
464
* (size_t)(cmdline_argc + 2)));
427
prompt = NULL;
428
429
/* Read reply from usplash */
430
/* Open FIFO */
431
outfifo_fd = open("/dev/.initramfs/usplash_outfifo", O_RDONLY);
432
if(outfifo_fd == -1){
433
if(errno != EINTR){
434
error(0, errno, "open");
435
status = EX_OSERR;
436
}
437
goto failure;
438
}
439
440
if(interrupted_by_signal){
441
goto failure;
442
}
443
444
/* Read from FIFO */
445
size_t buf_allocated = 0;
446
const size_t blocksize = 1024;
447
do {
448
/* Allocate more space */
449
if(buf_len + blocksize > buf_allocated){
450
char *tmp = realloc(buf, buf_allocated + blocksize);
465
451
if(tmp == NULL){
466
perror("realloc");
467
free(cmdline_argv);
468
return EXIT_FAILURE;
469
}
470
cmdline_argv = tmp;
471
cmdline_argv[cmdline_argc] = cmdline + position;
472
cmdline_argc++;
473
position += strlen(cmdline + position) + 1;
474
}
475
cmdline_argv[cmdline_argc] = NULL;
476
}
452
if(errno != EINTR){
453
error(0, errno, "realloc");
454
status = EX_OSERR;
455
}
456
goto failure;
457
}
458
buf = tmp;
459
buf_allocated += blocksize;
460
}
461
sret = read(outfifo_fd, buf + buf_len,
462
buf_allocated - buf_len);
463
if(sret == -1){
464
if(errno != EINTR){
465
error(0, errno, "read");
466
status = EX_OSERR;
467
}
468
TEMP_FAILURE_RETRY(close(outfifo_fd));
469
goto failure;
470
}
471
if(interrupted_by_signal){
472
break;
473
}
474
475
buf_len += (size_t)sret;
476
} while(sret != 0);
477
ret = close(outfifo_fd);
478
if(ret == -1){
479
if(errno != EINTR){
480
error(0, errno, "close");
481
status = EX_OSERR;
482
}
483
goto failure;
484
}
485
outfifo_fd = -1;
486
487
if(interrupted_by_signal){
488
goto failure;
489
}
490
491
if(not usplash_write(&fifo_fd, "TIMEOUT", "15")){
492
if(errno != EINTR){
493
error(0, errno, "usplash_write");
494
status = EX_OSERR;
495
}
496
goto failure;
497
}
498
499
if(interrupted_by_signal){
500
goto failure;
501
}
502
503
ret = close(fifo_fd);
504
if(ret == -1){
505
if(errno != EINTR){
506
error(0, errno, "close");
507
status = EX_OSERR;
508
}
509
goto failure;
510
}
511
fifo_fd = -1;
512
513
/* Print password to stdout */
514
size_t written = 0;
515
while(written < buf_len){
516
do {
517
sret = write(STDOUT_FILENO, buf + written, buf_len - written);
518
if(sret == -1){
519
if(errno != EINTR){
520
error(0, errno, "write");
521
status = EX_OSERR;
522
}
523
goto failure;
524
}
525
} while(sret == -1);
526
527
if(interrupted_by_signal){
528
goto failure;
529
}
530
written += (size_t)sret;
531
}
532
free(buf);
533
buf = NULL;
534
535
if(interrupted_by_signal){
536
goto failure;
537
}
538
539
free(cmdline);
540
return EXIT_SUCCESS;
541
542
failure:
543
544
free(buf);
545
546
free(prompt);
547
548
/* If usplash was never accessed, we can stop now */
549
if(not usplash_accessed){
550
return status;
551
}
552
553
/* Close FIFO */
554
if(fifo_fd != -1){
555
ret = (int)TEMP_FAILURE_RETRY(close(fifo_fd));
556
if(ret == -1 and errno != EINTR){
557
error(0, errno, "close");
558
}
559
fifo_fd = -1;
560
}
561
562
/* Close output FIFO */
563
if(outfifo_fd != -1){
564
ret = (int)TEMP_FAILURE_RETRY(close(outfifo_fd));
565
if(ret == -1){
566
error(0, errno, "close");
567
}
568
}
569
570
/* Create argv for new usplash*/
571
char **cmdline_argv = malloc((argz_count(cmdline, cmdline_len) + 1)
572
* sizeof(char *)); /* Count args */
573
if(cmdline_argv == NULL){
574
error(0, errno, "malloc");
575
return status;
576
}
577
argz_extract(cmdline, cmdline_len, cmdline_argv); /* Create argv */
578
477
579
/* Kill old usplash */
478
580
kill(usplash_pid, SIGTERM);
479
581
sleep(2);
481
583
kill(usplash_pid, SIGKILL);
482
584
sleep(1);
483
585
}
586
484
587
pid_t new_usplash_pid = fork();
485
588
if(new_usplash_pid == 0){
486
589
/* Child; will become new usplash process */
487
590
488
591
/* Make the effective user ID (root) the only user ID instead of
489
the real user ID (mandos) */
592
the real user ID (_mandos) */
490
593
ret = setuid(geteuid());
491
594
if(ret == -1){
492
perror("setuid");
595
error(0, errno, "setuid");
493
596
}
494
597
495
598
setsid();
496
599
ret = chdir("/");
600
if(ret == -1){
601
error(0, errno, "chdir");
602
_exit(EX_OSERR);
603
}
497
604
/* if(fork() != 0){ */
498
605
/* _exit(EXIT_SUCCESS); */
499
606
/* } */
500
607
ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
501
608
if(ret == -1){
502
perror("dup2");
503
_exit(EXIT_FAILURE);
609
error(0, errno, "dup2");
610
_exit(EX_OSERR);
504
611
}
505
612
506
613
execv(usplash_name, cmdline_argv);
507
614
if(not interrupted_by_signal){
508
perror("execv");
615
error(0, errno, "execv");
509
616
}
510
617
free(cmdline);
511
618
free(cmdline_argv);
512
_exit(EXIT_FAILURE);
619
_exit(EX_OSERR);
513
620
}
514
621
free(cmdline);
515
622
free(cmdline_argv);
516
623
sleep(2);
517
if(not usplash_write("PULSATE", NULL)
518
and (errno != EINTR)){
519
perror("usplash_write");
520
}
521
522
return EXIT_FAILURE;
624
if(not usplash_write(&fifo_fd, "PULSATE", NULL)){
625
if(errno != EINTR){
626
error(0, errno, "usplash_write");
627
}
628
}
629
630
/* Close FIFO (again) */
631
if(fifo_fd != -1){
632
ret = (int)TEMP_FAILURE_RETRY(close(fifo_fd));
633
if(ret == -1 and errno != EINTR){
634
error(0, errno, "close");
635
}
636
fifo_fd = -1;
637
}
638
639
if(interrupted_by_signal){
640
struct sigaction signal_action = { .sa_handler = SIG_DFL };
641
sigemptyset(&signal_action.sa_mask);
642
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
643
&signal_action, NULL));
644
if(ret == -1){
645
error(0, errno, "sigaction");
646
}
647
do {
648
ret = raise(signal_received);
649
} while(ret != 0 and errno == EINTR);
650
if(ret != 0){
651
error(0, errno, "raise");
652
abort();
653
}
654
TEMP_FAILURE_RETRY(pause());
655
}
656
657
return status;
523
658
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0