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- Committer: Björn Påhlsson
- Date: 2011-10-02 19:18:24 UTC
- mto: (237.7.53 trunk)
- mto: This revision was merged to the branch mainline in revision 286.
- Revision ID: belorn@fukt.bsnet.se-20111002191824-eweh4pvneeg3qzia
transitional stuff actually working
documented change to D-Bus API
documented change to D-Bus API
- files added:
- DBUS-API
- debian/source
- 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 © 2008-2011 Teddy Hogeborn
6
* Copyright © 2008-2011 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
22
22
* Contact the authors at <mandos@fukt.bsnet.se>.
23
23
*/
24
24
25
#define _GNU_SOURCE /* asprintf() */
25
#define _GNU_SOURCE /* asprintf(), TEMP_FAILURE_RETRY() */
26
26
#include <signal.h> /* sig_atomic_t, struct sigaction,
27
27
sigemptyset(), sigaddset(), SIGINT,
28
28
SIGHUP, SIGTERM, sigaction(),
31
31
#include <fcntl.h> /* open(), O_WRONLY, O_RDONLY */
32
32
#include <iso646.h> /* and, or, not*/
33
33
#include <errno.h> /* errno, EINTR */
34
#include <error.h>
34
35
#include <sys/types.h> /* size_t, ssize_t, pid_t, DIR, struct
35
36
dirent */
36
37
#include <stddef.h> /* NULL */
37
#include <string.h> /* strlen(), memcmp() */
38
#include <stdio.h> /* asprintf(), perror() */
38
#include <string.h> /* strlen(), memcmp(), strerror() */
39
#include <stdio.h> /* asprintf(), vasprintf(), vprintf(),
40
fprintf() */
39
41
#include <unistd.h> /* close(), write(), readlink(),
40
42
read(), STDOUT_FILENO, sleep(),
41
43
fork(), setuid(), geteuid(),
42
44
setsid(), chdir(), dup2(),
43
45
STDERR_FILENO, execv() */
44
46
#include <stdlib.h> /* free(), EXIT_FAILURE, realloc(),
45
EXIT_SUCCESS, malloc(), _exit() */
46
#include <stdlib.h> /* getenv() */
47
EXIT_SUCCESS, malloc(), _exit(),
48
getenv() */
47
49
#include <dirent.h> /* opendir(), readdir(), closedir() */
48
50
#include <inttypes.h> /* intmax_t, strtoimax() */
49
51
#include <sys/stat.h> /* struct stat, lstat(), S_ISLNK */
52
#include <sysexits.h> /* EX_OSERR, EX_UNAVAILABLE */
53
#include <argz.h> /* argz_count(), argz_extract() */
54
#include <stdarg.h> /* va_list, va_start(), ... */
50
55
51
56
sig_atomic_t interrupted_by_signal = 0;
52
53
static void termination_handler(__attribute__((unused))int signum){
57
int signal_received;
58
const char usplash_name[] = "/sbin/usplash";
59
60
/* Function to use when printing errors */
61
void error_plus(int status, int errnum, const char *formatstring,
62
...){
63
va_list ap;
64
char *text;
65
int ret;
66
67
va_start(ap, formatstring);
68
ret = vasprintf(&text, formatstring, ap);
69
if (ret == -1){
70
fprintf(stderr, "Mandos plugin %s: ",
71
program_invocation_short_name);
72
vfprintf(stderr, formatstring, ap);
73
fprintf(stderr, ": ");
74
fprintf(stderr, "%s\n", strerror(errnum));
75
error(status, errno, "vasprintf while printing error");
76
return;
77
}
78
fprintf(stderr, "Mandos plugin ");
79
error(status, errnum, "%s", text);
80
free(text);
81
}
82
83
static void termination_handler(int signum){
84
if(interrupted_by_signal){
85
return;
86
}
54
87
interrupted_by_signal = 1;
88
signal_received = signum;
55
89
}
56
90
57
static bool usplash_write(const char *cmd, const char *arg){
91
static bool usplash_write(int *fifo_fd_r,
92
const char *cmd, const char *arg){
58
93
/*
59
* usplash_write("TIMEOUT", "15") will write "TIMEOUT 15\0"
60
* usplash_write("PULSATE", NULL) will write "PULSATE\0"
94
* usplash_write(&fd, "TIMEOUT", "15") will write "TIMEOUT 15\0"
95
* usplash_write(&fd, "PULSATE", NULL) will write "PULSATE\0"
61
96
* SEE ALSO
62
97
* usplash_write(8)
63
98
*/
64
99
int ret;
65
int fifo_fd;
66
do {
67
fifo_fd = open("/dev/.initramfs/usplash_fifo", O_WRONLY);
68
if((fifo_fd == -1) and (errno != EINTR or interrupted_by_signal)){
100
if(*fifo_fd_r == -1){
101
ret = open("/dev/.initramfs/usplash_fifo", O_WRONLY);
102
if(ret == -1){
69
103
return false;
70
104
}
71
} while(fifo_fd == -1);
105
*fifo_fd_r = ret;
106
}
72
107
73
108
const char *cmd_line;
74
109
size_t cmd_line_len;
75
110
char *cmd_line_alloc = NULL;
76
111
if(arg == NULL){
77
112
cmd_line = cmd;
78
cmd_line_len = strlen(cmd);
113
cmd_line_len = strlen(cmd) + 1;
79
114
} else {
80
115
do {
81
116
ret = asprintf(&cmd_line_alloc, "%s %s", cmd, arg);
82
if(ret == -1 and (errno != EINTR or interrupted_by_signal)){
117
if(ret == -1){
83
118
int e = errno;
84
close(fifo_fd);
119
TEMP_FAILURE_RETRY(close(*fifo_fd_r));
85
120
errno = e;
86
121
return false;
87
122
}
92
127
93
128
size_t written = 0;
94
129
ssize_t sret = 0;
95
while(not interrupted_by_signal and written < cmd_line_len){
96
sret = write(fifo_fd, cmd_line + written,
130
while(written < cmd_line_len){
131
sret = write(*fifo_fd_r, cmd_line + written,
97
132
cmd_line_len - written);
98
133
if(sret == -1){
99
if(errno != EINTR or interrupted_by_signal){
100
int e = errno;
101
close(fifo_fd);
102
free(cmd_line_alloc);
103
errno = e;
104
return false;
105
} else {
106
continue;
107
}
134
int e = errno;
135
TEMP_FAILURE_RETRY(close(*fifo_fd_r));
136
free(cmd_line_alloc);
137
errno = e;
138
return false;
108
139
}
109
140
written += (size_t)sret;
110
141
}
111
142
free(cmd_line_alloc);
112
do {
113
ret = close(fifo_fd);
114
if(ret == -1 and (errno != EINTR or interrupted_by_signal)){
115
return false;
116
}
117
} while(ret == -1);
118
if(interrupted_by_signal){
119
return false;
120
}
143
121
144
return true;
122
145
}
123
146
147
/* Create prompt string */
148
char *makeprompt(void){
149
int ret = 0;
150
char *prompt;
151
const char *const cryptsource = getenv("cryptsource");
152
const char *const crypttarget = getenv("crypttarget");
153
const char prompt_start[] = "Enter passphrase to unlock the disk";
154
155
if(cryptsource == NULL){
156
if(crypttarget == NULL){
157
ret = asprintf(&prompt, "%s: ", prompt_start);
158
} else {
159
ret = asprintf(&prompt, "%s (%s): ", prompt_start,
160
crypttarget);
161
}
162
} else {
163
if(crypttarget == NULL){
164
ret = asprintf(&prompt, "%s %s: ", prompt_start, cryptsource);
165
} else {
166
ret = asprintf(&prompt, "%s %s (%s): ", prompt_start,
167
cryptsource, crypttarget);
168
}
169
}
170
if(ret == -1){
171
return NULL;
172
}
173
return prompt;
174
}
175
176
pid_t find_usplash(char **cmdline_r, size_t *cmdline_len_r){
177
int ret = 0;
178
ssize_t sret = 0;
179
char *cmdline = NULL;
180
size_t cmdline_len = 0;
181
DIR *proc_dir = opendir("/proc");
182
if(proc_dir == NULL){
183
error_plus(0, errno, "opendir");
184
return -1;
185
}
186
errno = 0;
187
for(struct dirent *proc_ent = readdir(proc_dir);
188
proc_ent != NULL;
189
proc_ent = readdir(proc_dir)){
190
pid_t pid;
191
{
192
intmax_t tmpmax;
193
char *tmp;
194
tmpmax = strtoimax(proc_ent->d_name, &tmp, 10);
195
if(errno != 0 or tmp == proc_ent->d_name or *tmp != '\0'
196
or tmpmax != (pid_t)tmpmax){
197
/* Not a process */
198
errno = 0;
199
continue;
200
}
201
pid = (pid_t)tmpmax;
202
}
203
/* Find the executable name by doing readlink() on the
204
/proc/<pid>/exe link */
205
char exe_target[sizeof(usplash_name)];
206
{
207
/* create file name string */
208
char *exe_link;
209
ret = asprintf(&exe_link, "/proc/%s/exe", proc_ent->d_name);
210
if(ret == -1){
211
error_plus(0, errno, "asprintf");
212
goto fail_find_usplash;
213
}
214
215
/* Check that it refers to a symlink owned by root:root */
216
struct stat exe_stat;
217
ret = lstat(exe_link, &exe_stat);
218
if(ret == -1){
219
if(errno == ENOENT){
220
free(exe_link);
221
continue;
222
}
223
error_plus(0, errno, "lstat");
224
free(exe_link);
225
goto fail_find_usplash;
226
}
227
if(not S_ISLNK(exe_stat.st_mode)
228
or exe_stat.st_uid != 0
229
or exe_stat.st_gid != 0){
230
free(exe_link);
231
continue;
232
}
233
234
sret = readlink(exe_link, exe_target, sizeof(exe_target));
235
free(exe_link);
236
}
237
/* Compare executable name */
238
if((sret != ((ssize_t)sizeof(exe_target)-1))
239
or (memcmp(usplash_name, exe_target,
240
sizeof(exe_target)-1) != 0)){
241
/* Not it */
242
continue;
243
}
244
/* Found usplash */
245
/* Read and save the command line of usplash in "cmdline" */
246
{
247
/* Open /proc/<pid>/cmdline */
248
int cl_fd;
249
{
250
char *cmdline_filename;
251
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
252
proc_ent->d_name);
253
if(ret == -1){
254
error_plus(0, errno, "asprintf");
255
goto fail_find_usplash;
256
}
257
cl_fd = open(cmdline_filename, O_RDONLY);
258
free(cmdline_filename);
259
if(cl_fd == -1){
260
error_plus(0, errno, "open");
261
goto fail_find_usplash;
262
}
263
}
264
size_t cmdline_allocated = 0;
265
char *tmp;
266
const size_t blocksize = 1024;
267
do {
268
/* Allocate more space? */
269
if(cmdline_len + blocksize > cmdline_allocated){
270
tmp = realloc(cmdline, cmdline_allocated + blocksize);
271
if(tmp == NULL){
272
error_plus(0, errno, "realloc");
273
close(cl_fd);
274
goto fail_find_usplash;
275
}
276
cmdline = tmp;
277
cmdline_allocated += blocksize;
278
}
279
/* Read data */
280
sret = read(cl_fd, cmdline + cmdline_len,
281
cmdline_allocated - cmdline_len);
282
if(sret == -1){
283
error_plus(0, errno, "read");
284
close(cl_fd);
285
goto fail_find_usplash;
286
}
287
cmdline_len += (size_t)sret;
288
} while(sret != 0);
289
ret = close(cl_fd);
290
if(ret == -1){
291
error_plus(0, errno, "close");
292
goto fail_find_usplash;
293
}
294
}
295
/* Close directory */
296
ret = closedir(proc_dir);
297
if(ret == -1){
298
error_plus(0, errno, "closedir");
299
goto fail_find_usplash;
300
}
301
/* Success */
302
*cmdline_r = cmdline;
303
*cmdline_len_r = cmdline_len;
304
return pid;
305
}
306
307
fail_find_usplash:
308
309
free(cmdline);
310
if(proc_dir != NULL){
311
int e = errno;
312
closedir(proc_dir);
313
errno = e;
314
}
315
return 0;
316
}
317
124
318
int main(__attribute__((unused))int argc,
125
319
__attribute__((unused))char **argv){
126
320
int ret = 0;
127
321
ssize_t sret;
128
bool an_error_occured = false;
322
int fifo_fd = -1;
323
int outfifo_fd = -1;
324
char *buf = NULL;
325
size_t buf_len = 0;
326
pid_t usplash_pid = -1;
327
bool usplash_accessed = false;
328
int status = EXIT_FAILURE; /* Default failure exit status */
129
329
130
/* Create prompt string */
131
char *prompt = NULL;
132
{
133
const char *const cryptsource = getenv("cryptsource");
134
const char *const crypttarget = getenv("crypttarget");
135
const char prompt_start[] = "Enter passphrase to unlock the disk";
136
137
if(cryptsource == NULL){
138
if(crypttarget == NULL){
139
ret = asprintf(&prompt, "%s: ", prompt_start);
140
} else {
141
ret = asprintf(&prompt, "%s (%s): ", prompt_start,
142
crypttarget);
143
}
144
} else {
145
if(crypttarget == NULL){
146
ret = asprintf(&prompt, "%s %s: ", prompt_start, cryptsource);
147
} else {
148
ret = asprintf(&prompt, "%s %s (%s): ", prompt_start,
149
cryptsource, crypttarget);
150
}
151
}
152
if(ret == -1){
153
return EXIT_FAILURE;
154
}
330
char *prompt = makeprompt();
331
if(prompt == NULL){
332
status = EX_OSERR;
333
goto failure;
155
334
}
156
335
157
336
/* Find usplash process */
158
pid_t usplash_pid = 0;
159
337
char *cmdline = NULL;
160
338
size_t cmdline_len = 0;
161
const char usplash_name[] = "/sbin/usplash";
162
{
163
DIR *proc_dir = opendir("/proc");
164
if(proc_dir == NULL){
165
free(prompt);
166
perror("opendir");
167
return EXIT_FAILURE;
168
}
169
for(struct dirent *proc_ent = readdir(proc_dir);
170
proc_ent != NULL;
171
proc_ent = readdir(proc_dir)){
172
pid_t pid;
173
{
174
intmax_t tmpmax;
175
char *tmp;
176
errno = 0;
177
tmpmax = strtoimax(proc_ent->d_name, &tmp, 10);
178
if(errno != 0 or tmp == proc_ent->d_name or *tmp != '\0'
179
or tmpmax != (pid_t)tmpmax){
180
/* Not a process */
181
continue;
182
}
183
pid = (pid_t)tmpmax;
184
}
185
/* Find the executable name by doing readlink() on the
186
/proc/<pid>/exe link */
187
char exe_target[sizeof(usplash_name)];
188
{
189
/* create file name string */
190
char *exe_link;
191
ret = asprintf(&exe_link, "/proc/%s/exe", proc_ent->d_name);
192
if(ret == -1){
193
perror("asprintf");
194
free(prompt);
195
closedir(proc_dir);
196
return EXIT_FAILURE;
197
}
198
199
/* Check that it refers to a symlink owned by root:root */
200
struct stat exe_stat;
201
ret = lstat(exe_link, &exe_stat);
202
if(ret == -1){
203
if(errno == ENOENT){
204
free(exe_link);
205
continue;
206
}
207
perror("lstat");
208
free(exe_link);
209
free(prompt);
210
closedir(proc_dir);
211
return EXIT_FAILURE;
212
}
213
if(not S_ISLNK(exe_stat.st_mode)
214
or exe_stat.st_uid != 0
215
or exe_stat.st_gid != 0){
216
free(exe_link);
217
continue;
218
}
219
220
sret = readlink(exe_link, exe_target, sizeof(exe_target));
221
free(exe_link);
222
}
223
if((sret == ((ssize_t)sizeof(exe_target)-1))
224
and (memcmp(usplash_name, exe_target,
225
sizeof(exe_target)-1) == 0)){
226
usplash_pid = pid;
227
/* Read and save the command line of usplash in "cmdline" */
228
{
229
/* Open /proc/<pid>/cmdline */
230
int cl_fd;
231
{
232
char *cmdline_filename;
233
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
234
proc_ent->d_name);
235
if(ret == -1){
236
perror("asprintf");
237
free(prompt);
238
closedir(proc_dir);
239
return EXIT_FAILURE;
240
}
241
cl_fd = open(cmdline_filename, O_RDONLY);
242
if(cl_fd == -1){
243
perror("open");
244
free(cmdline_filename);
245
free(prompt);
246
closedir(proc_dir);
247
return EXIT_FAILURE;
248
}
249
free(cmdline_filename);
250
}
251
size_t cmdline_allocated = 0;
252
char *tmp;
253
const size_t blocksize = 1024;
254
do {
255
if(cmdline_len + blocksize > cmdline_allocated){
256
tmp = realloc(cmdline, cmdline_allocated + blocksize);
257
if(tmp == NULL){
258
perror("realloc");
259
free(cmdline);
260
free(prompt);
261
closedir(proc_dir);
262
return EXIT_FAILURE;
263
}
264
cmdline = tmp;
265
cmdline_allocated += blocksize;
266
}
267
sret = read(cl_fd, cmdline + cmdline_len,
268
cmdline_allocated - cmdline_len);
269
if(sret == -1){
270
perror("read");
271
free(cmdline);
272
free(prompt);
273
closedir(proc_dir);
274
return EXIT_FAILURE;
275
}
276
cmdline_len += (size_t)sret;
277
} while(sret != 0);
278
close(cl_fd);
279
}
280
break;
281
}
282
}
283
closedir(proc_dir);
284
}
339
usplash_pid = find_usplash(&cmdline, &cmdline_len);
285
340
if(usplash_pid == 0){
286
free(prompt);
287
return EXIT_FAILURE;
341
status = EX_UNAVAILABLE;
342
goto failure;
288
343
}
289
344
290
345
/* Set up the signal handler */
293
348
new_action = { .sa_handler = termination_handler,
294
349
.sa_flags = 0 };
295
350
sigemptyset(&new_action.sa_mask);
296
sigaddset(&new_action.sa_mask, SIGINT);
297
sigaddset(&new_action.sa_mask, SIGHUP);
298
sigaddset(&new_action.sa_mask, SIGTERM);
351
ret = sigaddset(&new_action.sa_mask, SIGINT);
352
if(ret == -1){
353
error_plus(0, errno, "sigaddset");
354
status = EX_OSERR;
355
goto failure;
356
}
357
ret = sigaddset(&new_action.sa_mask, SIGHUP);
358
if(ret == -1){
359
error_plus(0, errno, "sigaddset");
360
status = EX_OSERR;
361
goto failure;
362
}
363
ret = sigaddset(&new_action.sa_mask, SIGTERM);
364
if(ret == -1){
365
error_plus(0, errno, "sigaddset");
366
status = EX_OSERR;
367
goto failure;
368
}
299
369
ret = sigaction(SIGINT, NULL, &old_action);
300
370
if(ret == -1){
301
perror("sigaction");
302
free(prompt);
303
return EXIT_FAILURE;
371
if(errno != EINTR){
372
error_plus(0, errno, "sigaction");
373
status = EX_OSERR;
374
}
375
goto failure;
304
376
}
305
377
if(old_action.sa_handler != SIG_IGN){
306
378
ret = sigaction(SIGINT, &new_action, NULL);
307
379
if(ret == -1){
308
perror("sigaction");
309
free(prompt);
310
return EXIT_FAILURE;
380
if(errno != EINTR){
381
error_plus(0, errno, "sigaction");
382
status = EX_OSERR;
383
}
384
goto failure;
311
385
}
312
386
}
313
387
ret = sigaction(SIGHUP, NULL, &old_action);
314
388
if(ret == -1){
315
perror("sigaction");
316
free(prompt);
317
return EXIT_FAILURE;
389
if(errno != EINTR){
390
error_plus(0, errno, "sigaction");
391
status = EX_OSERR;
392
}
393
goto failure;
318
394
}
319
395
if(old_action.sa_handler != SIG_IGN){
320
396
ret = sigaction(SIGHUP, &new_action, NULL);
321
397
if(ret == -1){
322
perror("sigaction");
323
free(prompt);
324
return EXIT_FAILURE;
398
if(errno != EINTR){
399
error_plus(0, errno, "sigaction");
400
status = EX_OSERR;
401
}
402
goto failure;
325
403
}
326
404
}
327
405
ret = sigaction(SIGTERM, NULL, &old_action);
328
406
if(ret == -1){
329
perror("sigaction");
330
free(prompt);
331
return EXIT_FAILURE;
407
if(errno != EINTR){
408
error_plus(0, errno, "sigaction");
409
status = EX_OSERR;
410
}
411
goto failure;
332
412
}
333
413
if(old_action.sa_handler != SIG_IGN){
334
414
ret = sigaction(SIGTERM, &new_action, NULL);
335
415
if(ret == -1){
336
perror("sigaction");
337
free(prompt);
338
return EXIT_FAILURE;
416
if(errno != EINTR){
417
error_plus(0, errno, "sigaction");
418
status = EX_OSERR;
419
}
420
goto failure;
339
421
}
340
422
}
341
423
}
342
424
425
usplash_accessed = true;
343
426
/* Write command to FIFO */
344
if(not interrupted_by_signal){
345
if(not usplash_write("TIMEOUT", "0")
346
and (errno != EINTR)){
347
perror("usplash_write");
348
an_error_occured = true;
349
}
350
}
351
if(not interrupted_by_signal and not an_error_occured){
352
if(not usplash_write("INPUTQUIET", prompt)
353
and (errno != EINTR)){
354
perror("usplash_write");
355
an_error_occured = true;
356
}
357
}
427
if(not usplash_write(&fifo_fd, "TIMEOUT", "0")){
428
if(errno != EINTR){
429
error_plus(0, errno, "usplash_write");
430
status = EX_OSERR;
431
}
432
goto failure;
433
}
434
435
if(interrupted_by_signal){
436
goto failure;
437
}
438
439
if(not usplash_write(&fifo_fd, "INPUTQUIET", prompt)){
440
if(errno != EINTR){
441
error_plus(0, errno, "usplash_write");
442
status = EX_OSERR;
443
}
444
goto failure;
445
}
446
447
if(interrupted_by_signal){
448
goto failure;
449
}
450
358
451
free(prompt);
359
360
/* This is not really a loop; while() is used to be able to "break"
361
out of it; those breaks are marked "Big" */
362
while(not interrupted_by_signal and not an_error_occured){
363
char *buf = NULL;
364
size_t buf_len = 0;
365
366
/* Open FIFO */
367
int fifo_fd;
368
do {
369
fifo_fd = open("/dev/.initramfs/usplash_outfifo", O_RDONLY);
370
if(fifo_fd == -1){
371
if(errno != EINTR){
372
perror("open");
373
an_error_occured = true;
374
break;
375
}
376
if(interrupted_by_signal){
377
break;
378
}
379
}
380
} while(fifo_fd == -1);
381
if(interrupted_by_signal or an_error_occured){
382
break; /* Big */
383
}
384
385
/* Read from FIFO */
386
size_t buf_allocated = 0;
387
const size_t blocksize = 1024;
388
do {
389
if(buf_len + blocksize > buf_allocated){
390
char *tmp = realloc(buf, buf_allocated + blocksize);
391
if(tmp == NULL){
392
perror("realloc");
393
an_error_occured = true;
394
break;
395
}
396
buf = tmp;
397
buf_allocated += blocksize;
398
}
399
do {
400
sret = read(fifo_fd, buf + buf_len, buf_allocated - buf_len);
401
if(sret == -1){
402
if(errno != EINTR){
403
perror("read");
404
an_error_occured = true;
405
break;
406
}
407
if(interrupted_by_signal){
408
break;
409
}
410
}
411
} while(sret == -1);
412
if(interrupted_by_signal or an_error_occured){
413
break;
414
}
415
416
buf_len += (size_t)sret;
417
} while(sret != 0);
418
close(fifo_fd);
419
if(interrupted_by_signal or an_error_occured){
420
break; /* Big */
421
}
422
423
if(not usplash_write("TIMEOUT", "15")
424
and (errno != EINTR)){
425
perror("usplash_write");
426
an_error_occured = true;
427
}
428
if(interrupted_by_signal or an_error_occured){
429
break; /* Big */
430
}
431
432
/* Print password to stdout */
433
size_t written = 0;
434
while(written < buf_len){
435
do {
436
sret = write(STDOUT_FILENO, buf + written, buf_len - written);
437
if(sret == -1){
438
if(errno != EINTR){
439
perror("write");
440
an_error_occured = true;
441
break;
442
}
443
if(interrupted_by_signal){
444
break;
445
}
446
}
447
} while(sret == -1);
448
if(interrupted_by_signal or an_error_occured){
449
break;
450
}
451
written += (size_t)sret;
452
}
453
free(buf);
454
if(not interrupted_by_signal and not an_error_occured){
455
free(cmdline);
456
return EXIT_SUCCESS;
457
}
458
break; /* Big */
459
} /* end of non-loop while() */
460
461
/* If we got here, an error or interrupt must have happened */
462
463
/* Create argc and argv for new usplash*/
464
int cmdline_argc = 0;
465
char **cmdline_argv = malloc(sizeof(char *));
466
{
467
size_t position = 0;
468
while(position < cmdline_len){
469
char **tmp = realloc(cmdline_argv,
470
(sizeof(char *)
471
* (size_t)(cmdline_argc + 2)));
452
prompt = NULL;
453
454
/* Read reply from usplash */
455
/* Open FIFO */
456
outfifo_fd = open("/dev/.initramfs/usplash_outfifo", O_RDONLY);
457
if(outfifo_fd == -1){
458
if(errno != EINTR){
459
error_plus(0, errno, "open");
460
status = EX_OSERR;
461
}
462
goto failure;
463
}
464
465
if(interrupted_by_signal){
466
goto failure;
467
}
468
469
/* Read from FIFO */
470
size_t buf_allocated = 0;
471
const size_t blocksize = 1024;
472
do {
473
/* Allocate more space */
474
if(buf_len + blocksize > buf_allocated){
475
char *tmp = realloc(buf, buf_allocated + blocksize);
472
476
if(tmp == NULL){
473
perror("realloc");
474
free(cmdline_argv);
475
return EXIT_FAILURE;
476
}
477
cmdline_argv = tmp;
478
cmdline_argv[cmdline_argc] = cmdline + position;
479
cmdline_argc++;
480
position += strlen(cmdline + position) + 1;
481
}
482
cmdline_argv[cmdline_argc] = NULL;
483
}
477
if(errno != EINTR){
478
error_plus(0, errno, "realloc");
479
status = EX_OSERR;
480
}
481
goto failure;
482
}
483
buf = tmp;
484
buf_allocated += blocksize;
485
}
486
sret = read(outfifo_fd, buf + buf_len,
487
buf_allocated - buf_len);
488
if(sret == -1){
489
if(errno != EINTR){
490
error_plus(0, errno, "read");
491
status = EX_OSERR;
492
}
493
TEMP_FAILURE_RETRY(close(outfifo_fd));
494
goto failure;
495
}
496
if(interrupted_by_signal){
497
break;
498
}
499
500
buf_len += (size_t)sret;
501
} while(sret != 0);
502
ret = close(outfifo_fd);
503
if(ret == -1){
504
if(errno != EINTR){
505
error_plus(0, errno, "close");
506
status = EX_OSERR;
507
}
508
goto failure;
509
}
510
outfifo_fd = -1;
511
512
if(interrupted_by_signal){
513
goto failure;
514
}
515
516
if(not usplash_write(&fifo_fd, "TIMEOUT", "15")){
517
if(errno != EINTR){
518
error_plus(0, errno, "usplash_write");
519
status = EX_OSERR;
520
}
521
goto failure;
522
}
523
524
if(interrupted_by_signal){
525
goto failure;
526
}
527
528
ret = close(fifo_fd);
529
if(ret == -1){
530
if(errno != EINTR){
531
error_plus(0, errno, "close");
532
status = EX_OSERR;
533
}
534
goto failure;
535
}
536
fifo_fd = -1;
537
538
/* Print password to stdout */
539
size_t written = 0;
540
while(written < buf_len){
541
do {
542
sret = write(STDOUT_FILENO, buf + written, buf_len - written);
543
if(sret == -1){
544
if(errno != EINTR){
545
error_plus(0, errno, "write");
546
status = EX_OSERR;
547
}
548
goto failure;
549
}
550
} while(sret == -1);
551
552
if(interrupted_by_signal){
553
goto failure;
554
}
555
written += (size_t)sret;
556
}
557
free(buf);
558
buf = NULL;
559
560
if(interrupted_by_signal){
561
goto failure;
562
}
563
564
free(cmdline);
565
return EXIT_SUCCESS;
566
567
failure:
568
569
free(buf);
570
571
free(prompt);
572
573
/* If usplash was never accessed, we can stop now */
574
if(not usplash_accessed){
575
return status;
576
}
577
578
/* Close FIFO */
579
if(fifo_fd != -1){
580
ret = (int)TEMP_FAILURE_RETRY(close(fifo_fd));
581
if(ret == -1 and errno != EINTR){
582
error_plus(0, errno, "close");
583
}
584
fifo_fd = -1;
585
}
586
587
/* Close output FIFO */
588
if(outfifo_fd != -1){
589
ret = (int)TEMP_FAILURE_RETRY(close(outfifo_fd));
590
if(ret == -1){
591
error_plus(0, errno, "close");
592
}
593
}
594
595
/* Create argv for new usplash*/
596
char **cmdline_argv = malloc((argz_count(cmdline, cmdline_len) + 1)
597
* sizeof(char *)); /* Count args */
598
if(cmdline_argv == NULL){
599
error_plus(0, errno, "malloc");
600
return status;
601
}
602
argz_extract(cmdline, cmdline_len, cmdline_argv); /* Create argv */
603
484
604
/* Kill old usplash */
485
605
kill(usplash_pid, SIGTERM);
486
606
sleep(2);
488
608
kill(usplash_pid, SIGKILL);
489
609
sleep(1);
490
610
}
611
491
612
pid_t new_usplash_pid = fork();
492
613
if(new_usplash_pid == 0){
493
614
/* Child; will become new usplash process */
496
617
the real user ID (_mandos) */
497
618
ret = setuid(geteuid());
498
619
if(ret == -1){
499
perror("setuid");
620
error_plus(0, errno, "setuid");
500
621
}
501
622
502
623
setsid();
503
624
ret = chdir("/");
625
if(ret == -1){
626
error_plus(0, errno, "chdir");
627
_exit(EX_OSERR);
628
}
504
629
/* if(fork() != 0){ */
505
630
/* _exit(EXIT_SUCCESS); */
506
631
/* } */
507
632
ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
508
633
if(ret == -1){
509
perror("dup2");
510
_exit(EXIT_FAILURE);
634
error_plus(0, errno, "dup2");
635
_exit(EX_OSERR);
511
636
}
512
637
513
638
execv(usplash_name, cmdline_argv);
514
639
if(not interrupted_by_signal){
515
perror("execv");
640
error_plus(0, errno, "execv");
516
641
}
517
642
free(cmdline);
518
643
free(cmdline_argv);
519
_exit(EXIT_FAILURE);
644
_exit(EX_OSERR);
520
645
}
521
646
free(cmdline);
522
647
free(cmdline_argv);
523
648
sleep(2);
524
if(not usplash_write("PULSATE", NULL)
525
and (errno != EINTR)){
526
perror("usplash_write");
527
}
528
529
return EXIT_FAILURE;
649
if(not usplash_write(&fifo_fd, "PULSATE", NULL)){
650
if(errno != EINTR){
651
error_plus(0, errno, "usplash_write");
652
}
653
}
654
655
/* Close FIFO (again) */
656
if(fifo_fd != -1){
657
ret = (int)TEMP_FAILURE_RETRY(close(fifo_fd));
658
if(ret == -1 and errno != EINTR){
659
error_plus(0, errno, "close");
660
}
661
fifo_fd = -1;
662
}
663
664
if(interrupted_by_signal){
665
struct sigaction signal_action = { .sa_handler = SIG_DFL };
666
sigemptyset(&signal_action.sa_mask);
667
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
668
&signal_action, NULL));
669
if(ret == -1){
670
error_plus(0, errno, "sigaction");
671
}
672
do {
673
ret = raise(signal_received);
674
} while(ret != 0 and errno == EINTR);
675
if(ret != 0){
676
error_plus(0, errno, "raise");
677
abort();
678
}
679
TEMP_FAILURE_RETRY(pause());
680
}
681
682
return status;
530
683
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0