To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/splashy.c
- browse files at revision 406
- compare with another revision
- download diff
- download tarball
- view history from revision 406
- Committer: Teddy Hogeborn
- Date: 2009-11-09 07:35:16 UTC
- Revision ID: teddy@fukt.bsnet.se-20091109073516-v1vem352uz0vuwrd
* dbus-mandos.conf: New; to be copied to
"/etc/dbus-1/system.d/mandos.conf".
"/etc/dbus-1/system.d/mandos.conf".
- files added:
- dbus-mandos.conf
- files modified:
- Makefile
added
removed
plugins.d/splashy.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 /* TEMP_FAILURE_RETRY(), asprintf() */
27
26
#include <signal.h> /* sig_atomic_t, struct sigaction,
28
27
sigemptyset(), sigaddset(), SIGINT,
29
28
SIGHUP, SIGTERM, sigaction,
41
40
#include <iso646.h> /* not, or, and */
42
41
#include <unistd.h> /* readlink(), fork(), execl(),
43
42
sleep(), dup2() STDERR_FILENO,
44
STDOUT_FILENO, _exit() */
43
STDOUT_FILENO, _exit(),
44
pause() */
45
45
#include <string.h> /* memcmp() */
46
#include <errno.h> /* errno */
46
#include <errno.h> /* errno, EACCES, ENOTDIR, ELOOP,
47
ENOENT, ENAMETOOLONG, EMFILE,
48
ENFILE, ENOMEM, ENOEXEC, EINVAL,
49
E2BIG, EFAULT, EIO, ETXTBSY,
50
EISDIR, ELIBBAD, EPERM, EINTR,
51
ECHILD */
47
52
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
48
53
WEXITSTATUS() */
54
#include <sysexits.h> /* EX_OSERR, EX_OSFILE,
55
EX_UNAVAILABLE */
49
56
50
57
sig_atomic_t interrupted_by_signal = 0;
51
58
int signal_received;
61
68
int main(__attribute__((unused))int argc,
62
69
__attribute__((unused))char **argv){
63
70
int ret = 0;
71
char *prompt = NULL;
72
DIR *proc_dir = NULL;
73
pid_t splashy_pid = 0;
74
pid_t splashy_command_pid = 0;
75
int exitstatus = EXIT_FAILURE;
64
76
65
77
/* Create prompt string */
66
char *prompt = NULL;
67
78
{
68
79
const char *const cryptsource = getenv("cryptsource");
69
80
const char *const crypttarget = getenv("crypttarget");
86
97
}
87
98
}
88
99
if(ret == -1){
89
return EXIT_FAILURE;
100
prompt = NULL;
101
exitstatus = EX_OSERR;
102
goto failure;
90
103
}
91
104
}
92
105
93
106
/* Find splashy process */
94
pid_t splashy_pid = 0;
95
107
{
96
108
const char splashy_name[] = "/sbin/splashy";
97
DIR *proc_dir = opendir("/proc");
109
proc_dir = opendir("/proc");
98
110
if(proc_dir == NULL){
99
free(prompt);
111
int e = errno;
100
112
perror("opendir");
101
return EXIT_FAILURE;
113
switch(e){
114
case EACCES:
115
case ENOTDIR:
116
case ELOOP:
117
case ENOENT:
118
default:
119
exitstatus = EX_OSFILE;
120
break;
121
case ENAMETOOLONG:
122
case EMFILE:
123
case ENFILE:
124
case ENOMEM:
125
exitstatus = EX_OSERR;
126
break;
127
}
128
goto failure;
102
129
}
103
130
for(struct dirent *proc_ent = readdir(proc_dir);
104
131
proc_ent != NULL;
125
152
ret = asprintf(&exe_link, "/proc/%s/exe", proc_ent->d_name);
126
153
if(ret == -1){
127
154
perror("asprintf");
128
free(prompt);
129
closedir(proc_dir);
130
return EXIT_FAILURE;
155
exitstatus = EX_OSERR;
156
goto failure;
131
157
}
132
158
133
159
/* Check that it refers to a symlink owned by root:root */
138
164
free(exe_link);
139
165
continue;
140
166
}
167
int e = errno;
141
168
perror("lstat");
142
169
free(exe_link);
143
free(prompt);
144
closedir(proc_dir);
145
return EXIT_FAILURE;
170
switch(e){
171
case EACCES:
172
case ENOTDIR:
173
case ELOOP:
174
default:
175
exitstatus = EX_OSFILE;
176
break;
177
case ENAMETOOLONG:
178
exitstatus = EX_OSERR;
179
break;
180
}
181
goto failure;
146
182
}
147
183
if(not S_ISLNK(exe_stat.st_mode)
148
184
or exe_stat.st_uid != 0
162
198
}
163
199
}
164
200
closedir(proc_dir);
201
proc_dir = NULL;
165
202
}
166
203
if(splashy_pid == 0){
167
free(prompt);
168
return EXIT_FAILURE;
204
exitstatus = EX_UNAVAILABLE;
205
goto failure;
169
206
}
170
207
171
208
/* Set up the signal handler */
174
211
new_action = { .sa_handler = termination_handler,
175
212
.sa_flags = 0 };
176
213
sigemptyset(&new_action.sa_mask);
177
sigaddset(&new_action.sa_mask, SIGINT);
178
if(ret == -1){
179
perror("sigaddset");
180
free(prompt);
181
return EXIT_FAILURE;
182
}
183
sigaddset(&new_action.sa_mask, SIGHUP);
184
if(ret == -1){
185
perror("sigaddset");
186
free(prompt);
187
return EXIT_FAILURE;
188
}
189
sigaddset(&new_action.sa_mask, SIGTERM);
190
if(ret == -1){
191
perror("sigaddset");
192
free(prompt);
193
return EXIT_FAILURE;
214
ret = sigaddset(&new_action.sa_mask, SIGINT);
215
if(ret == -1){
216
perror("sigaddset");
217
exitstatus = EX_OSERR;
218
goto failure;
219
}
220
ret = sigaddset(&new_action.sa_mask, SIGHUP);
221
if(ret == -1){
222
perror("sigaddset");
223
exitstatus = EX_OSERR;
224
goto failure;
225
}
226
ret = sigaddset(&new_action.sa_mask, SIGTERM);
227
if(ret == -1){
228
perror("sigaddset");
229
exitstatus = EX_OSERR;
230
goto failure;
194
231
}
195
232
ret = sigaction(SIGINT, NULL, &old_action);
196
233
if(ret == -1){
197
234
perror("sigaction");
198
free(prompt);
199
return EXIT_FAILURE;
235
exitstatus = EX_OSERR;
236
goto failure;
200
237
}
201
238
if(old_action.sa_handler != SIG_IGN){
202
239
ret = sigaction(SIGINT, &new_action, NULL);
203
240
if(ret == -1){
204
241
perror("sigaction");
205
free(prompt);
206
return EXIT_FAILURE;
242
exitstatus = EX_OSERR;
243
goto failure;
207
244
}
208
245
}
209
246
ret = sigaction(SIGHUP, NULL, &old_action);
210
247
if(ret == -1){
211
248
perror("sigaction");
212
free(prompt);
213
return EXIT_FAILURE;
249
exitstatus = EX_OSERR;
250
goto failure;
214
251
}
215
252
if(old_action.sa_handler != SIG_IGN){
216
253
ret = sigaction(SIGHUP, &new_action, NULL);
217
254
if(ret == -1){
218
255
perror("sigaction");
219
free(prompt);
220
return EXIT_FAILURE;
256
exitstatus = EX_OSERR;
257
goto failure;
221
258
}
222
259
}
223
260
ret = sigaction(SIGTERM, NULL, &old_action);
224
261
if(ret == -1){
225
262
perror("sigaction");
226
free(prompt);
227
return EXIT_FAILURE;
263
exitstatus = EX_OSERR;
264
goto failure;
228
265
}
229
266
if(old_action.sa_handler != SIG_IGN){
230
267
ret = sigaction(SIGTERM, &new_action, NULL);
231
268
if(ret == -1){
232
269
perror("sigaction");
233
free(prompt);
234
return EXIT_FAILURE;
270
exitstatus = EX_OSERR;
271
goto failure;
235
272
}
236
273
}
237
274
}
238
275
276
if(interrupted_by_signal){
277
goto failure;
278
}
279
239
280
/* Fork off the splashy command to prompt for password */
240
pid_t splashy_command_pid = 0;
241
if(not interrupted_by_signal){
242
splashy_command_pid = fork();
243
if(splashy_command_pid == -1){
244
if(not interrupted_by_signal){
245
perror("fork");
246
}
247
return EXIT_FAILURE;
248
}
249
/* Child */
250
if(splashy_command_pid == 0){
281
splashy_command_pid = fork();
282
if(splashy_command_pid != 0 and interrupted_by_signal){
283
goto failure;
284
}
285
if(splashy_command_pid == -1){
286
perror("fork");
287
exitstatus = EX_OSERR;
288
goto failure;
289
}
290
/* Child */
291
if(splashy_command_pid == 0){
292
if(not interrupted_by_signal){
251
293
const char splashy_command[] = "/sbin/splashy_update";
252
ret = execl(splashy_command, splashy_command, prompt,
253
(char *)NULL);
254
if(not interrupted_by_signal){
255
perror("execl");
294
execl(splashy_command, splashy_command, prompt, (char *)NULL);
295
int e = errno;
296
perror("execl");
297
switch(e){
298
case EACCES:
299
case ENOENT:
300
case ENOEXEC:
301
case EINVAL:
302
_exit(EX_UNAVAILABLE);
303
case ENAMETOOLONG:
304
case E2BIG:
305
case ENOMEM:
306
case EFAULT:
307
case EIO:
308
case EMFILE:
309
case ENFILE:
310
case ETXTBSY:
311
default:
312
_exit(EX_OSERR);
313
case ENOTDIR:
314
case ELOOP:
315
case EISDIR:
316
case ELIBBAD:
317
case EPERM:
318
_exit(EX_OSFILE);
256
319
}
257
free(prompt);
258
_exit(EXIT_FAILURE);
259
320
}
321
free(prompt);
322
_exit(EXIT_FAILURE);
260
323
}
261
324
262
325
/* Parent */
263
326
free(prompt);
327
prompt = NULL;
328
329
if(interrupted_by_signal){
330
goto failure;
331
}
264
332
265
333
/* Wait for command to complete */
266
if(not interrupted_by_signal and splashy_command_pid != 0){
334
{
267
335
int status;
268
ret = waitpid(splashy_command_pid, &status, 0);
336
do {
337
ret = waitpid(splashy_command_pid, &status, 0);
338
} while(ret == -1 and errno == EINTR
339
and not interrupted_by_signal);
340
if(interrupted_by_signal){
341
goto failure;
342
}
269
343
if(ret == -1){
270
if(errno != EINTR){
271
perror("waitpid");
272
}
344
perror("waitpid");
273
345
if(errno == ECHILD){
274
346
splashy_command_pid = 0;
275
347
}
276
348
} else {
277
349
/* The child process has exited */
278
350
splashy_command_pid = 0;
279
if(not interrupted_by_signal and WIFEXITED(status)
280
and WEXITSTATUS(status)==0){
351
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
281
352
return EXIT_SUCCESS;
282
353
}
283
354
}
284
355
}
285
kill(splashy_pid, SIGTERM);
286
if(interrupted_by_signal and splashy_command_pid != 0){
287
kill(splashy_command_pid, SIGTERM);
288
}
289
sleep(2);
290
while(kill(splashy_pid, 0) == 0){
291
kill(splashy_pid, SIGKILL);
292
sleep(1);
293
}
294
pid_t new_splashy_pid = fork();
295
if(new_splashy_pid == 0){
296
/* Child; will become new splashy process */
297
298
/* Make the effective user ID (root) the only user ID instead of
299
the real user ID (_mandos) */
300
ret = setuid(geteuid());
301
if(ret == -1){
302
perror("setuid");
303
}
304
305
setsid();
306
ret = chdir("/");
307
/* if(fork() != 0){ */
308
/* _exit(EXIT_SUCCESS); */
309
/* } */
310
ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
311
if(ret == -1){
312
perror("dup2");
313
_exit(EXIT_FAILURE);
314
}
315
316
execl("/sbin/splashy", "/sbin/splashy", "boot", (char *)NULL);
317
if(not interrupted_by_signal){
318
perror("execl");
319
}
320
_exit(EXIT_FAILURE);
321
}
322
323
return EXIT_FAILURE;
356
357
failure:
358
359
free(prompt);
360
361
if(proc_dir != NULL){
362
TEMP_FAILURE_RETRY(closedir(proc_dir));
363
}
364
365
if(splashy_command_pid != 0){
366
TEMP_FAILURE_RETRY(kill(splashy_command_pid, SIGTERM));
367
368
TEMP_FAILURE_RETRY(kill(splashy_pid, SIGTERM));
369
sleep(2);
370
while(TEMP_FAILURE_RETRY(kill(splashy_pid, 0)) == 0){
371
TEMP_FAILURE_RETRY(kill(splashy_pid, SIGKILL));
372
sleep(1);
373
}
374
pid_t new_splashy_pid = (pid_t)TEMP_FAILURE_RETRY(fork());
375
if(new_splashy_pid == 0){
376
/* Child; will become new splashy process */
377
378
/* Make the effective user ID (root) the only user ID instead of
379
the real user ID (_mandos) */
380
ret = setuid(geteuid());
381
if(ret == -1){
382
perror("setuid");
383
}
384
385
setsid();
386
ret = chdir("/");
387
if(ret == -1){
388
perror("chdir");
389
}
390
/* if(fork() != 0){ */
391
/* _exit(EXIT_SUCCESS); */
392
/* } */
393
ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace stdout */
394
if(ret == -1){
395
perror("dup2");
396
_exit(EX_OSERR);
397
}
398
399
execl("/sbin/splashy", "/sbin/splashy", "boot", (char *)NULL);
400
{
401
int e = errno;
402
perror("execl");
403
switch(e){
404
case EACCES:
405
case ENOENT:
406
case ENOEXEC:
407
default:
408
_exit(EX_UNAVAILABLE);
409
case ENAMETOOLONG:
410
case E2BIG:
411
case ENOMEM:
412
_exit(EX_OSERR);
413
case ENOTDIR:
414
case ELOOP:
415
_exit(EX_OSFILE);
416
}
417
}
418
}
419
}
420
421
if(interrupted_by_signal){
422
struct sigaction signal_action;
423
sigemptyset(&signal_action.sa_mask);
424
signal_action.sa_handler = SIG_DFL;
425
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
426
&signal_action, NULL));
427
if(ret == -1){
428
perror("sigaction");
429
}
430
do {
431
ret = raise(signal_received);
432
} while(ret != 0 and errno == EINTR);
433
if(ret != 0){
434
perror("raise");
435
abort();
436
}
437
TEMP_FAILURE_RETRY(pause());
438
}
439
440
return exitstatus;
324
441
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0