3
3
* Usplash - Read a password from usplash and output it
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
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.
13
* This program is distributed in the hope that it will be useful, but
5
* Copyright © 2008-2017 Teddy Hogeborn
6
* Copyright © 2008-2017 Björn Påhlsson
8
* This file is part of Mandos.
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
15
* Mandos is distributed in the hope that it will be useful, but
14
16
* WITHOUT ANY WARRANTY; without even the implied warranty of
15
17
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16
18
* General Public License for more details.
18
20
* 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
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
23
* Contact the authors at <mandos@recompile.se>.
25
#define _GNU_SOURCE /* asprintf() */
26
#define _GNU_SOURCE /* asprintf(), TEMP_FAILURE_RETRY() */
26
27
#include <signal.h> /* sig_atomic_t, struct sigaction,
27
28
sigemptyset(), sigaddset(), SIGINT,
28
29
SIGHUP, SIGTERM, sigaction(),
31
32
#include <fcntl.h> /* open(), O_WRONLY, O_RDONLY */
32
33
#include <iso646.h> /* and, or, not*/
33
34
#include <errno.h> /* errno, EINTR */
34
36
#include <sys/types.h> /* size_t, ssize_t, pid_t, DIR, struct
36
38
#include <stddef.h> /* NULL */
37
#include <string.h> /* strlen(), memcmp() */
38
#include <stdio.h> /* asprintf(), perror() */
39
#include <string.h> /* strlen(), memcmp(), strerror() */
40
#include <stdio.h> /* asprintf(), vasprintf(), vprintf(),
39
42
#include <unistd.h> /* close(), write(), readlink(),
40
43
read(), STDOUT_FILENO, sleep(),
41
44
fork(), setuid(), geteuid(),
42
45
setsid(), chdir(), dup2(),
43
46
STDERR_FILENO, execv() */
44
47
#include <stdlib.h> /* free(), EXIT_FAILURE, realloc(),
45
EXIT_SUCCESS, malloc(), _exit() */
46
#include <stdlib.h> /* getenv() */
48
EXIT_SUCCESS, malloc(), _exit(),
47
50
#include <dirent.h> /* opendir(), readdir(), closedir() */
48
51
#include <inttypes.h> /* intmax_t, strtoimax() */
49
52
#include <sys/stat.h> /* struct stat, lstat(), S_ISLNK */
53
#include <sysexits.h> /* EX_OSERR, EX_UNAVAILABLE */
54
#include <argz.h> /* argz_count(), argz_extract() */
55
#include <stdarg.h> /* va_list, va_start(), ... */
51
57
sig_atomic_t interrupted_by_signal = 0;
53
static void termination_handler(__attribute__((unused))int signum){
59
const char usplash_name[] = "/sbin/usplash";
61
/* Function to use when printing errors */
62
__attribute__((format (gnu_printf, 3, 4)))
63
void error_plus(int status, int errnum, const char *formatstring,
69
va_start(ap, formatstring);
70
ret = vasprintf(&text, formatstring, ap);
72
fprintf(stderr, "Mandos plugin %s: ",
73
program_invocation_short_name);
74
vfprintf(stderr, formatstring, ap);
75
fprintf(stderr, ": ");
76
fprintf(stderr, "%s\n", strerror(errnum));
77
error(status, errno, "vasprintf while printing error");
80
fprintf(stderr, "Mandos plugin ");
81
error(status, errnum, "%s", text);
85
static void termination_handler(int signum){
86
if(interrupted_by_signal){
54
89
interrupted_by_signal = 1;
90
signal_received = signum;
57
static bool usplash_write(const char *cmd, const char *arg){
93
static bool usplash_write(int *fifo_fd_r,
94
const char *cmd, const char *arg){
59
* usplash_write("TIMEOUT", "15") will write "TIMEOUT 15\0"
60
* usplash_write("PULSATE", NULL) will write "PULSATE\0"
96
* usplash_write(&fd, "TIMEOUT", "15") will write "TIMEOUT 15\0"
97
* usplash_write(&fd, "PULSATE", NULL) will write "PULSATE\0"
67
fifo_fd = open("/dev/.initramfs/usplash_fifo", O_WRONLY);
68
if(fifo_fd == -1 and (errno != EINTR or interrupted_by_signal)){
102
if(*fifo_fd_r == -1){
103
ret = open("/dev/.initramfs/usplash_fifo", O_WRONLY);
71
} while(fifo_fd == -1);
73
110
const char *cmd_line;
74
111
size_t cmd_line_len;
75
112
char *cmd_line_alloc = NULL;
78
cmd_line_len = strlen(cmd);
115
cmd_line_len = strlen(cmd) + 1;
81
118
ret = asprintf(&cmd_line_alloc, "%s %s", cmd, arg);
82
if(ret == -1 and (errno != EINTR or interrupted_by_signal)){
93
130
size_t written = 0;
95
while(not interrupted_by_signal and written < cmd_line_len){
96
sret = write(fifo_fd, cmd_line + written,
132
while(written < cmd_line_len){
133
sret = write(*fifo_fd_r, cmd_line + written,
97
134
cmd_line_len - written);
99
if(errno != EINTR or interrupted_by_signal){
102
free(cmd_line_alloc);
138
free(cmd_line_alloc);
109
142
written += (size_t)sret;
111
144
free(cmd_line_alloc);
113
ret = close(fifo_fd);
114
if(ret == -1 and (errno != EINTR or interrupted_by_signal)){
118
if(interrupted_by_signal){
149
/* Create prompt string */
150
char *makeprompt(void){
153
const char *const cryptsource = getenv("cryptsource");
154
const char *const crypttarget = getenv("crypttarget");
155
const char prompt_start[] = "Enter passphrase to unlock the disk";
157
if(cryptsource == NULL){
158
if(crypttarget == NULL){
159
ret = asprintf(&prompt, "%s: ", prompt_start);
161
ret = asprintf(&prompt, "%s (%s): ", prompt_start,
165
if(crypttarget == NULL){
166
ret = asprintf(&prompt, "%s %s: ", prompt_start, cryptsource);
168
ret = asprintf(&prompt, "%s %s (%s): ", prompt_start,
169
cryptsource, crypttarget);
178
pid_t find_usplash(char **cmdline_r, size_t *cmdline_len_r){
181
char *cmdline = NULL;
182
size_t cmdline_len = 0;
183
DIR *proc_dir = opendir("/proc");
184
if(proc_dir == NULL){
185
error_plus(0, errno, "opendir");
189
for(struct dirent *proc_ent = readdir(proc_dir);
191
proc_ent = readdir(proc_dir)){
196
tmpmax = strtoimax(proc_ent->d_name, &tmp, 10);
197
if(errno != 0 or tmp == proc_ent->d_name or *tmp != '\0'
198
or tmpmax != (pid_t)tmpmax){
205
/* Find the executable name by doing readlink() on the
206
/proc/<pid>/exe link */
207
char exe_target[sizeof(usplash_name)];
209
/* create file name string */
211
ret = asprintf(&exe_link, "/proc/%s/exe", proc_ent->d_name);
213
error_plus(0, errno, "asprintf");
214
goto fail_find_usplash;
217
/* Check that it refers to a symlink owned by root:root */
218
struct stat exe_stat;
219
ret = lstat(exe_link, &exe_stat);
225
error_plus(0, errno, "lstat");
227
goto fail_find_usplash;
229
if(not S_ISLNK(exe_stat.st_mode)
230
or exe_stat.st_uid != 0
231
or exe_stat.st_gid != 0){
236
sret = readlink(exe_link, exe_target, sizeof(exe_target));
239
/* Compare executable name */
240
if((sret != ((ssize_t)sizeof(exe_target)-1))
241
or (memcmp(usplash_name, exe_target,
242
sizeof(exe_target)-1) != 0)){
247
/* Read and save the command line of usplash in "cmdline" */
249
/* Open /proc/<pid>/cmdline */
252
char *cmdline_filename;
253
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
256
error_plus(0, errno, "asprintf");
257
goto fail_find_usplash;
259
cl_fd = open(cmdline_filename, O_RDONLY);
260
free(cmdline_filename);
262
error_plus(0, errno, "open");
263
goto fail_find_usplash;
266
size_t cmdline_allocated = 0;
268
const size_t blocksize = 1024;
270
/* Allocate more space? */
271
if(cmdline_len + blocksize > cmdline_allocated){
272
tmp = realloc(cmdline, cmdline_allocated + blocksize);
274
error_plus(0, errno, "realloc");
276
goto fail_find_usplash;
279
cmdline_allocated += blocksize;
282
sret = read(cl_fd, cmdline + cmdline_len,
283
cmdline_allocated - cmdline_len);
285
error_plus(0, errno, "read");
287
goto fail_find_usplash;
289
cmdline_len += (size_t)sret;
293
error_plus(0, errno, "close");
294
goto fail_find_usplash;
297
/* Close directory */
298
ret = closedir(proc_dir);
300
error_plus(0, errno, "closedir");
301
goto fail_find_usplash;
304
*cmdline_r = cmdline;
305
*cmdline_len_r = cmdline_len;
312
if(proc_dir != NULL){
124
320
int main(__attribute__((unused))int argc,
125
321
__attribute__((unused))char **argv){
128
bool an_error_occured = false;
328
pid_t usplash_pid = -1;
329
bool usplash_accessed = false;
330
int status = EXIT_FAILURE; /* Default failure exit status */
130
/* Create prompt string */
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";
137
if(cryptsource == NULL){
138
if(crypttarget == NULL){
139
ret = asprintf(&prompt, "%s: ", prompt_start);
141
ret = asprintf(&prompt, "%s (%s): ", prompt_start,
145
if(crypttarget == NULL){
146
ret = asprintf(&prompt, "%s %s: ", prompt_start, cryptsource);
148
ret = asprintf(&prompt, "%s %s (%s): ", prompt_start,
149
cryptsource, crypttarget);
332
char *prompt = makeprompt();
157
338
/* Find usplash process */
158
pid_t usplash_pid = 0;
159
339
char *cmdline = NULL;
160
340
size_t cmdline_len = 0;
161
const char usplash_name[] = "/sbin/usplash";
163
DIR *proc_dir = opendir("/proc");
164
if(proc_dir == NULL){
169
for(struct dirent *proc_ent = readdir(proc_dir);
171
proc_ent = readdir(proc_dir)){
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){
185
/* Find the executable name by doing readlink() on the
186
/proc/<pid>/exe link */
187
char exe_target[sizeof(usplash_name)];
189
/* create file name string */
191
ret = asprintf(&exe_link, "/proc/%s/exe", proc_ent->d_name);
199
/* Check that it refers to a symlink owned by root:root */
200
struct stat exe_stat;
201
ret = lstat(exe_link, &exe_stat);
213
if(not S_ISLNK(exe_stat.st_mode)
214
or exe_stat.st_uid != 0
215
or exe_stat.st_gid != 0){
220
sret = readlink(exe_link, exe_target, sizeof(exe_target));
223
if((sret == ((ssize_t)sizeof(exe_target)-1))
224
and (memcmp(usplash_name, exe_target,
225
sizeof(exe_target)-1) == 0)){
227
/* Read and save the command line of usplash in "cmdline" */
229
/* Open /proc/<pid>/cmdline */
232
char *cmdline_filename;
233
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
241
cl_fd = open(cmdline_filename, O_RDONLY);
244
free(cmdline_filename);
249
free(cmdline_filename);
251
size_t cmdline_allocated = 0;
253
const size_t blocksize = 1024;
255
if(cmdline_len + blocksize > cmdline_allocated){
256
tmp = realloc(cmdline, cmdline_allocated + blocksize);
265
cmdline_allocated += blocksize;
267
sret = read(cl_fd, cmdline + cmdline_len,
268
cmdline_allocated - cmdline_len);
276
cmdline_len += (size_t)sret;
341
usplash_pid = find_usplash(&cmdline, &cmdline_len);
285
342
if(usplash_pid == 0){
343
status = EX_UNAVAILABLE;
290
347
/* Set up the signal handler */
293
350
new_action = { .sa_handler = termination_handler,
295
352
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);
353
ret = sigaddset(&new_action.sa_mask, SIGINT);
355
error_plus(0, errno, "sigaddset");
359
ret = sigaddset(&new_action.sa_mask, SIGHUP);
361
error_plus(0, errno, "sigaddset");
365
ret = sigaddset(&new_action.sa_mask, SIGTERM);
367
error_plus(0, errno, "sigaddset");
299
371
ret = sigaction(SIGINT, NULL, &old_action);
374
error_plus(0, errno, "sigaction");
305
379
if(old_action.sa_handler != SIG_IGN){
306
380
ret = sigaction(SIGINT, &new_action, NULL);
383
error_plus(0, errno, "sigaction");
313
389
ret = sigaction(SIGHUP, NULL, &old_action);
392
error_plus(0, errno, "sigaction");
319
397
if(old_action.sa_handler != SIG_IGN){
320
398
ret = sigaction(SIGHUP, &new_action, NULL);
401
error_plus(0, errno, "sigaction");
327
407
ret = sigaction(SIGTERM, NULL, &old_action);
410
error_plus(0, errno, "sigaction");
333
415
if(old_action.sa_handler != SIG_IGN){
334
416
ret = sigaction(SIGTERM, &new_action, NULL);
419
error_plus(0, errno, "sigaction");
427
usplash_accessed = true;
343
428
/* 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;
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;
429
if(not usplash_write(&fifo_fd, "TIMEOUT", "0")){
431
error_plus(0, errno, "usplash_write");
437
if(interrupted_by_signal){
441
if(not usplash_write(&fifo_fd, "INPUTQUIET", prompt)){
443
error_plus(0, errno, "usplash_write");
449
if(interrupted_by_signal){
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){
369
fifo_fd = open("/dev/.initramfs/usplash_outfifo", O_RDONLY);
373
an_error_occured = true;
376
if(interrupted_by_signal){
380
} while(fifo_fd == -1);
381
if(interrupted_by_signal or an_error_occured){
386
size_t buf_allocated = 0;
387
const size_t blocksize = 1024;
389
if(buf_len + blocksize > buf_allocated){
390
char *tmp = realloc(buf, buf_allocated + blocksize);
393
an_error_occured = true;
397
buf_allocated += blocksize;
400
sret = read(fifo_fd, buf + buf_len, buf_allocated - buf_len);
404
an_error_occured = true;
407
if(interrupted_by_signal){
412
if(interrupted_by_signal or an_error_occured){
416
buf_len += (size_t)sret;
419
if(interrupted_by_signal or an_error_occured){
423
if(not usplash_write("TIMEOUT", "15")
424
and (errno != EINTR)){
425
perror("usplash_write");
426
an_error_occured = true;
428
if(interrupted_by_signal or an_error_occured){
432
/* Print password to stdout */
434
while(written < buf_len){
436
sret = write(STDOUT_FILENO, buf + written, buf_len - written);
440
an_error_occured = true;
443
if(interrupted_by_signal){
448
if(interrupted_by_signal or an_error_occured){
451
written += (size_t)sret;
454
if(not interrupted_by_signal and not an_error_occured){
459
} /* end of non-loop while() */
461
/* If we got here, an error or interrupt must have happened */
463
/* Create argc and argv for new usplash*/
464
int cmdline_argc = 0;
465
char **cmdline_argv = malloc(sizeof(char *));
468
while(position < cmdline_len){
469
char **tmp = realloc(cmdline_argv,
471
* (size_t)(cmdline_argc + 2)));
456
/* Read reply from usplash */
458
outfifo_fd = open("/dev/.initramfs/usplash_outfifo", O_RDONLY);
459
if(outfifo_fd == -1){
461
error_plus(0, errno, "open");
467
if(interrupted_by_signal){
472
size_t buf_allocated = 0;
473
const size_t blocksize = 1024;
475
/* Allocate more space */
476
if(buf_len + blocksize > buf_allocated){
477
char *tmp = realloc(buf, buf_allocated + blocksize);
478
cmdline_argv[cmdline_argc] = cmdline + position;
480
position += strlen(cmdline + position) + 1;
482
cmdline_argv[cmdline_argc] = NULL;
480
error_plus(0, errno, "realloc");
486
buf_allocated += blocksize;
488
sret = read(outfifo_fd, buf + buf_len,
489
buf_allocated - buf_len);
492
error_plus(0, errno, "read");
498
if(interrupted_by_signal){
502
buf_len += (size_t)sret;
504
ret = close(outfifo_fd);
507
error_plus(0, errno, "close");
514
if(interrupted_by_signal){
518
if(not usplash_write(&fifo_fd, "TIMEOUT", "15")){
520
error_plus(0, errno, "usplash_write");
526
if(interrupted_by_signal){
530
ret = close(fifo_fd);
533
error_plus(0, errno, "close");
540
/* Print password to stdout */
542
while(written < buf_len){
544
sret = write(STDOUT_FILENO, buf + written, buf_len - written);
547
error_plus(0, errno, "write");
554
if(interrupted_by_signal){
557
written += (size_t)sret;
562
if(interrupted_by_signal){
575
/* If usplash was never accessed, we can stop now */
576
if(not usplash_accessed){
582
ret = close(fifo_fd);
583
if(ret == -1 and errno != EINTR){
584
error_plus(0, errno, "close");
589
/* Close output FIFO */
590
if(outfifo_fd != -1){
591
ret = close(outfifo_fd);
593
error_plus(0, errno, "close");
597
/* Create argv for new usplash*/
598
char **cmdline_argv = malloc((argz_count(cmdline, cmdline_len) + 1)
599
* sizeof(char *)); /* Count args */
600
if(cmdline_argv == NULL){
601
error_plus(0, errno, "malloc");
604
argz_extract(cmdline, cmdline_len, cmdline_argv); /* Create argv */
484
606
/* Kill old usplash */
485
607
kill(usplash_pid, SIGTERM);
496
619
the real user ID (_mandos) */
497
620
ret = setuid(geteuid());
622
error_plus(0, errno, "setuid");
503
626
ret = chdir("/");
628
error_plus(0, errno, "chdir");
504
631
/* if(fork() != 0){ */
505
632
/* _exit(EXIT_SUCCESS); */
507
634
ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
636
error_plus(0, errno, "dup2");
513
640
execv(usplash_name, cmdline_argv);
514
641
if(not interrupted_by_signal){
642
error_plus(0, errno, "execv");
518
645
free(cmdline_argv);
522
649
free(cmdline_argv);
524
if(not usplash_write("PULSATE", NULL)
525
and (errno != EINTR)){
526
perror("usplash_write");
651
if(not usplash_write(&fifo_fd, "PULSATE", NULL)){
653
error_plus(0, errno, "usplash_write");
657
/* Close FIFO (again) */
659
ret = close(fifo_fd);
660
if(ret == -1 and errno != EINTR){
661
error_plus(0, errno, "close");
666
if(interrupted_by_signal){
667
struct sigaction signal_action = { .sa_handler = SIG_DFL };
668
sigemptyset(&signal_action.sa_mask);
669
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
670
&signal_action, NULL));
672
error_plus(0, errno, "sigaction");
675
ret = raise(signal_received);
676
} while(ret != 0 and errno == EINTR);
678
error_plus(0, errno, "raise");
681
TEMP_FAILURE_RETRY(pause());