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- Committer: Teddy Hogeborn
- Date: 2009-02-05 03:26:27 UTC
- Revision ID: teddy@fukt.bsnet.se-20090205032627-fbvgm97q5gtrbg10
* plugin-runner.c (handle_sigchld): Bug fix: Save and restore "errno".
- files added:
- initramfs-tools-hook-conf
- files removed:
- DBUS-API
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/splashy.c
2
2
/*
3
3
* Splashy - Read a password from splashy and output it
4
4
*
5
* Copyright © 2008-2018 Teddy Hogeborn
6
* Copyright © 2008-2018 Björn Påhlsson
7
*
8
* This file is part of Mandos.
9
*
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.
14
*
15
* Mandos is distributed in the hope that it will be useful, but
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
7
*
8
* This program is free software: you can redistribute it and/or
9
* modify it under the terms of the GNU General Public License as
10
* published by the Free Software Foundation, either version 3 of the
11
* License, or (at your option) any later version.
12
*
13
* This program is distributed in the hope that it will be useful, but
16
14
* WITHOUT ANY WARRANTY; without even the implied warranty of
17
15
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18
16
* General Public License for more details.
19
17
*
20
18
* You should have received a copy of the GNU General Public License
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
19
* along with this program. If not, see
20
* <http://www.gnu.org/licenses/>.
22
21
*
23
* Contact the authors at <mandos@recompile.se>.
22
* Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
23
* <https://www.fukt.bsnet.se/~teddy/>.
24
24
*/
25
25
26
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
26
#define _GNU_SOURCE /* asprintf() */
27
27
#include <signal.h> /* sig_atomic_t, struct sigaction,
28
28
sigemptyset(), sigaddset(), SIGINT,
29
29
SIGHUP, SIGTERM, sigaction,
30
30
SIG_IGN, kill(), SIGKILL */
31
31
#include <stddef.h> /* NULL */
32
32
#include <stdlib.h> /* getenv() */
33
#include <stdio.h> /* asprintf(), vasprintf(), vprintf(),
34
fprintf() */
33
#include <stdio.h> /* asprintf(), perror(), sscanf() */
35
34
#include <stdlib.h> /* EXIT_FAILURE, free(),
36
35
EXIT_SUCCESS */
37
36
#include <sys/types.h> /* pid_t, DIR, struct dirent,
38
37
ssize_t */
39
38
#include <dirent.h> /* opendir(), readdir(), closedir() */
40
#include <inttypes.h> /* intmax_t, strtoimax() */
39
#include <inttypes.h> /* intmax_t, SCNdMAX */
41
40
#include <sys/stat.h> /* struct stat, lstat(), S_ISLNK */
42
41
#include <iso646.h> /* not, or, and */
43
42
#include <unistd.h> /* readlink(), fork(), execl(),
44
43
sleep(), dup2() STDERR_FILENO,
45
STDOUT_FILENO, _exit(),
46
pause() */
47
#include <string.h> /* memcmp(), strerror() */
48
#include <errno.h> /* errno, EACCES, ENOTDIR, ELOOP,
49
ENOENT, ENAMETOOLONG, EMFILE,
50
ENFILE, ENOMEM, ENOEXEC, EINVAL,
51
E2BIG, EFAULT, EIO, ETXTBSY,
52
EISDIR, ELIBBAD, EPERM, EINTR,
53
ECHILD */
54
#include <error.h> /* error() */
44
STDOUT_FILENO, _exit() */
45
#include <string.h> /* memcmp() */
46
#include <errno.h> /* errno */
55
47
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
56
48
WEXITSTATUS() */
57
#include <sysexits.h> /* EX_OSERR, EX_OSFILE,
58
EX_UNAVAILABLE */
59
#include <stdarg.h> /* va_list, va_start(), ... */
60
49
61
50
sig_atomic_t interrupted_by_signal = 0;
62
int signal_received;
63
64
/* Function to use when printing errors */
65
__attribute__((format (gnu_printf, 3, 4)))
66
void error_plus(int status, int errnum, const char *formatstring,
67
...){
68
va_list ap;
69
char *text;
70
int ret;
71
72
va_start(ap, formatstring);
73
ret = vasprintf(&text, formatstring, ap);
74
if(ret == -1){
75
fprintf(stderr, "Mandos plugin %s: ",
76
program_invocation_short_name);
77
vfprintf(stderr, formatstring, ap);
78
fprintf(stderr, ": ");
79
fprintf(stderr, "%s\n", strerror(errnum));
80
error(status, errno, "vasprintf while printing error");
81
return;
82
}
83
fprintf(stderr, "Mandos plugin ");
84
error(status, errnum, "%s", text);
85
free(text);
86
}
87
88
89
static void termination_handler(int signum){
90
if(interrupted_by_signal){
91
return;
92
}
51
52
static void termination_handler(__attribute__((unused))int signum){
93
53
interrupted_by_signal = 1;
94
signal_received = signum;
95
54
}
96
55
97
56
int main(__attribute__((unused))int argc,
98
57
__attribute__((unused))char **argv){
99
58
int ret = 0;
59
60
/* Create prompt string */
100
61
char *prompt = NULL;
101
DIR *proc_dir = NULL;
102
pid_t splashy_pid = 0;
103
pid_t splashy_command_pid = 0;
104
int exitstatus = EXIT_FAILURE;
105
106
/* Create prompt string */
107
62
{
108
63
const char *const cryptsource = getenv("cryptsource");
109
64
const char *const crypttarget = getenv("crypttarget");
126
81
}
127
82
}
128
83
if(ret == -1){
129
prompt = NULL;
130
exitstatus = EX_OSERR;
131
goto failure;
84
return EXIT_FAILURE;
132
85
}
133
86
}
134
87
135
88
/* Find splashy process */
89
pid_t splashy_pid = 0;
136
90
{
137
91
const char splashy_name[] = "/sbin/splashy";
138
proc_dir = opendir("/proc");
92
DIR *proc_dir = opendir("/proc");
139
93
if(proc_dir == NULL){
140
int e = errno;
141
error_plus(0, errno, "opendir");
142
switch(e){
143
case EACCES:
144
case ENOTDIR:
145
case ELOOP:
146
case ENOENT:
147
default:
148
exitstatus = EX_OSFILE;
149
break;
150
case ENAMETOOLONG:
151
case EMFILE:
152
case ENFILE:
153
case ENOMEM:
154
exitstatus = EX_OSERR;
155
break;
156
}
157
goto failure;
94
free(prompt);
95
perror("opendir");
96
return EXIT_FAILURE;
158
97
}
159
98
for(struct dirent *proc_ent = readdir(proc_dir);
160
99
proc_ent != NULL;
162
101
pid_t pid;
163
102
{
164
103
intmax_t tmpmax;
165
char *tmp;
166
errno = 0;
167
tmpmax = strtoimax(proc_ent->d_name, &tmp, 10);
168
if(errno != 0 or tmp == proc_ent->d_name or *tmp != '\0'
169
or tmpmax != (pid_t)tmpmax){
104
int numchars;
105
ret = sscanf(proc_ent->d_name, "%" SCNdMAX "%n", &tmpmax,
106
&numchars);
107
if(ret < 1 or tmpmax != (pid_t)tmpmax
108
or proc_ent->d_name[numchars] != '\0'){
170
109
/* Not a process */
171
110
continue;
172
111
}
180
119
char *exe_link;
181
120
ret = asprintf(&exe_link, "/proc/%s/exe", proc_ent->d_name);
182
121
if(ret == -1){
183
error_plus(0, errno, "asprintf");
184
exitstatus = EX_OSERR;
185
goto failure;
122
perror("asprintf");
123
free(prompt);
124
closedir(proc_dir);
125
return EXIT_FAILURE;
186
126
}
187
127
188
128
/* Check that it refers to a symlink owned by root:root */
193
133
free(exe_link);
194
134
continue;
195
135
}
196
int e = errno;
197
error_plus(0, errno, "lstat");
136
perror("lstat");
198
137
free(exe_link);
199
switch(e){
200
case EACCES:
201
case ENOTDIR:
202
case ELOOP:
203
default:
204
exitstatus = EX_OSFILE;
205
break;
206
case ENAMETOOLONG:
207
exitstatus = EX_OSERR;
208
break;
209
}
210
goto failure;
138
free(prompt);
139
closedir(proc_dir);
140
return EXIT_FAILURE;
211
141
}
212
142
if(not S_ISLNK(exe_stat.st_mode)
213
143
or exe_stat.st_uid != 0
227
157
}
228
158
}
229
159
closedir(proc_dir);
230
proc_dir = NULL;
231
160
}
232
161
if(splashy_pid == 0){
233
exitstatus = EX_UNAVAILABLE;
234
goto failure;
162
free(prompt);
163
return EXIT_FAILURE;
235
164
}
236
165
237
166
/* Set up the signal handler */
240
169
new_action = { .sa_handler = termination_handler,
241
170
.sa_flags = 0 };
242
171
sigemptyset(&new_action.sa_mask);
243
ret = sigaddset(&new_action.sa_mask, SIGINT);
244
if(ret == -1){
245
error_plus(0, errno, "sigaddset");
246
exitstatus = EX_OSERR;
247
goto failure;
248
}
249
ret = sigaddset(&new_action.sa_mask, SIGHUP);
250
if(ret == -1){
251
error_plus(0, errno, "sigaddset");
252
exitstatus = EX_OSERR;
253
goto failure;
254
}
255
ret = sigaddset(&new_action.sa_mask, SIGTERM);
256
if(ret == -1){
257
error_plus(0, errno, "sigaddset");
258
exitstatus = EX_OSERR;
259
goto failure;
260
}
172
sigaddset(&new_action.sa_mask, SIGINT);
173
sigaddset(&new_action.sa_mask, SIGHUP);
174
sigaddset(&new_action.sa_mask, SIGTERM);
261
175
ret = sigaction(SIGINT, NULL, &old_action);
262
176
if(ret == -1){
263
error_plus(0, errno, "sigaction");
264
exitstatus = EX_OSERR;
265
goto failure;
177
perror("sigaction");
178
free(prompt);
179
return EXIT_FAILURE;
266
180
}
267
181
if(old_action.sa_handler != SIG_IGN){
268
182
ret = sigaction(SIGINT, &new_action, NULL);
269
183
if(ret == -1){
270
error_plus(0, errno, "sigaction");
271
exitstatus = EX_OSERR;
272
goto failure;
184
perror("sigaction");
185
free(prompt);
186
return EXIT_FAILURE;
273
187
}
274
188
}
275
189
ret = sigaction(SIGHUP, NULL, &old_action);
276
190
if(ret == -1){
277
error_plus(0, errno, "sigaction");
278
exitstatus = EX_OSERR;
279
goto failure;
191
perror("sigaction");
192
free(prompt);
193
return EXIT_FAILURE;
280
194
}
281
195
if(old_action.sa_handler != SIG_IGN){
282
196
ret = sigaction(SIGHUP, &new_action, NULL);
283
197
if(ret == -1){
284
error_plus(0, errno, "sigaction");
285
exitstatus = EX_OSERR;
286
goto failure;
198
perror("sigaction");
199
free(prompt);
200
return EXIT_FAILURE;
287
201
}
288
202
}
289
203
ret = sigaction(SIGTERM, NULL, &old_action);
290
204
if(ret == -1){
291
error_plus(0, errno, "sigaction");
292
exitstatus = EX_OSERR;
293
goto failure;
205
perror("sigaction");
206
free(prompt);
207
return EXIT_FAILURE;
294
208
}
295
209
if(old_action.sa_handler != SIG_IGN){
296
210
ret = sigaction(SIGTERM, &new_action, NULL);
297
211
if(ret == -1){
298
error_plus(0, errno, "sigaction");
299
exitstatus = EX_OSERR;
300
goto failure;
212
perror("sigaction");
213
free(prompt);
214
return EXIT_FAILURE;
301
215
}
302
216
}
303
217
}
304
218
305
if(interrupted_by_signal){
306
goto failure;
307
}
308
309
219
/* Fork off the splashy command to prompt for password */
310
splashy_command_pid = fork();
311
if(splashy_command_pid != 0 and interrupted_by_signal){
312
goto failure;
313
}
314
if(splashy_command_pid == -1){
315
error_plus(0, errno, "fork");
316
exitstatus = EX_OSERR;
317
goto failure;
318
}
319
/* Child */
320
if(splashy_command_pid == 0){
321
if(not interrupted_by_signal){
220
pid_t splashy_command_pid = 0;
221
if(not interrupted_by_signal){
222
splashy_command_pid = fork();
223
if(splashy_command_pid == -1){
224
if(not interrupted_by_signal){
225
perror("fork");
226
}
227
return EXIT_FAILURE;
228
}
229
/* Child */
230
if(splashy_command_pid == 0){
322
231
const char splashy_command[] = "/sbin/splashy_update";
323
execl(splashy_command, splashy_command, prompt, (char *)NULL);
324
int e = errno;
325
error_plus(0, errno, "execl");
326
switch(e){
327
case EACCES:
328
case ENOENT:
329
case ENOEXEC:
330
case EINVAL:
331
_exit(EX_UNAVAILABLE);
332
case ENAMETOOLONG:
333
case E2BIG:
334
case ENOMEM:
335
case EFAULT:
336
case EIO:
337
case EMFILE:
338
case ENFILE:
339
case ETXTBSY:
340
default:
341
_exit(EX_OSERR);
342
case ENOTDIR:
343
case ELOOP:
344
case EISDIR:
345
#ifdef ELIBBAD
346
case ELIBBAD: /* Linux only */
347
#endif
348
case EPERM:
349
_exit(EX_OSFILE);
232
ret = execl(splashy_command, splashy_command, prompt,
233
(char *)NULL);
234
if(not interrupted_by_signal){
235
perror("execl");
350
236
}
237
free(prompt);
238
_exit(EXIT_FAILURE);
351
239
}
352
free(prompt);
353
_exit(EXIT_FAILURE);
354
240
}
355
241
356
242
/* Parent */
357
243
free(prompt);
358
prompt = NULL;
359
360
if(interrupted_by_signal){
361
goto failure;
362
}
363
244
364
245
/* Wait for command to complete */
365
{
246
if(not interrupted_by_signal and splashy_command_pid != 0){
366
247
int status;
367
do {
368
ret = waitpid(splashy_command_pid, &status, 0);
369
} while(ret == -1 and errno == EINTR
370
and not interrupted_by_signal);
371
if(interrupted_by_signal){
372
goto failure;
373
}
248
ret = waitpid(splashy_command_pid, &status, 0);
374
249
if(ret == -1){
375
error_plus(0, errno, "waitpid");
250
if(errno != EINTR){
251
perror("waitpid");
252
}
376
253
if(errno == ECHILD){
377
254
splashy_command_pid = 0;
378
255
}
379
256
} else {
380
257
/* The child process has exited */
381
258
splashy_command_pid = 0;
382
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
259
if(not interrupted_by_signal and WIFEXITED(status)
260
and WEXITSTATUS(status)==0){
383
261
return EXIT_SUCCESS;
384
262
}
385
263
}
386
264
}
387
388
failure:
389
390
free(prompt);
391
392
if(proc_dir != NULL){
393
TEMP_FAILURE_RETRY(closedir(proc_dir));
394
}
395
396
if(splashy_command_pid != 0){
397
TEMP_FAILURE_RETRY(kill(splashy_command_pid, SIGTERM));
398
399
TEMP_FAILURE_RETRY(kill(splashy_pid, SIGTERM));
400
sleep(2);
401
while(TEMP_FAILURE_RETRY(kill(splashy_pid, 0)) == 0){
402
TEMP_FAILURE_RETRY(kill(splashy_pid, SIGKILL));
403
sleep(1);
404
}
405
pid_t new_splashy_pid = (pid_t)TEMP_FAILURE_RETRY(fork());
406
if(new_splashy_pid == 0){
407
/* Child; will become new splashy process */
408
409
/* Make the effective user ID (root) the only user ID instead of
410
the real user ID (_mandos) */
411
ret = setuid(geteuid());
412
if(ret == -1){
413
error_plus(0, errno, "setuid");
414
}
415
416
setsid();
417
ret = chdir("/");
418
if(ret == -1){
419
error_plus(0, errno, "chdir");
420
}
421
/* if(fork() != 0){ */
422
/* _exit(EXIT_SUCCESS); */
423
/* } */
424
ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace stdout */
425
if(ret == -1){
426
error_plus(0, errno, "dup2");
427
_exit(EX_OSERR);
428
}
429
430
execl("/sbin/splashy", "/sbin/splashy", "boot", (char *)NULL);
431
{
432
int e = errno;
433
error_plus(0, errno, "execl");
434
switch(e){
435
case EACCES:
436
case ENOENT:
437
case ENOEXEC:
438
default:
439
_exit(EX_UNAVAILABLE);
440
case ENAMETOOLONG:
441
case E2BIG:
442
case ENOMEM:
443
_exit(EX_OSERR);
444
case ENOTDIR:
445
case ELOOP:
446
_exit(EX_OSFILE);
447
}
448
}
449
}
450
}
451
452
if(interrupted_by_signal){
453
struct sigaction signal_action;
454
sigemptyset(&signal_action.sa_mask);
455
signal_action.sa_handler = SIG_DFL;
456
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
457
&signal_action, NULL));
458
if(ret == -1){
459
error_plus(0, errno, "sigaction");
460
}
461
do {
462
ret = raise(signal_received);
463
} while(ret != 0 and errno == EINTR);
464
if(ret != 0){
465
error_plus(0, errno, "raise");
466
abort();
467
}
468
TEMP_FAILURE_RETRY(pause());
469
}
470
471
return exitstatus;
265
kill(splashy_pid, SIGTERM);
266
if(interrupted_by_signal and splashy_command_pid != 0){
267
kill(splashy_command_pid, SIGTERM);
268
}
269
sleep(2);
270
while(kill(splashy_pid, 0) == 0){
271
kill(splashy_pid, SIGKILL);
272
sleep(1);
273
}
274
pid_t new_splashy_pid = fork();
275
if(new_splashy_pid == 0){
276
/* Child; will become new splashy process */
277
278
/* Make the effective user ID (root) the only user ID instead of
279
the real user ID (_mandos) */
280
ret = setuid(geteuid());
281
if(ret == -1){
282
perror("setuid");
283
}
284
285
setsid();
286
ret = chdir("/");
287
/* if(fork() != 0){ */
288
/* _exit(EXIT_SUCCESS); */
289
/* } */
290
ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
291
if(ret == -1){
292
perror("dup2");
293
_exit(EXIT_FAILURE);
294
}
295
296
execl("/sbin/splashy", "/sbin/splashy", "boot", (char *)NULL);
297
if(not interrupted_by_signal){
298
perror("execl");
299
}
300
_exit(EXIT_FAILURE);
301
}
302
303
return EXIT_FAILURE;
472
304
}
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