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- Committer: Teddy Hogeborn
- Date: 2009-02-23 11:52:42 UTC
- mto: (237.4.2 mandos-pipe-ipc) (24.1.137 mandos) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 252.
- Revision ID: teddy@fukt.bsnet.se-20090223115242-5930ewin7m4o6zpr
* README (The Plugin System): Improve wording.
- files removed:
- 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 <mandos@fukt.bsnet.se>.
22
* Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
23
* <https://www.fukt.bsnet.se/~teddy/>.
23
24
*/
24
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
26
#define _GNU_SOURCE /* asprintf() */
26
27
#include <signal.h> /* sig_atomic_t, struct sigaction,
27
28
sigemptyset(), sigaddset(), SIGINT,
28
29
SIGHUP, SIGTERM, sigaction,
40
41
#include <iso646.h> /* not, or, and */
41
42
#include <unistd.h> /* readlink(), fork(), execl(),
42
43
sleep(), dup2() STDERR_FILENO,
43
STDOUT_FILENO, _exit(),
44
pause() */
44
STDOUT_FILENO, _exit() */
45
45
#include <string.h> /* memcmp() */
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 */
46
#include <errno.h> /* errno */
52
47
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
53
48
WEXITSTATUS() */
54
#include <sysexits.h> /* EX_OSERR, EX_OSFILE,
55
EX_UNAVAILABLE */
56
49
57
50
sig_atomic_t interrupted_by_signal = 0;
58
int signal_received;
59
51
60
static void termination_handler(int signum){
61
if(interrupted_by_signal){
62
return;
63
}
52
static void termination_handler(__attribute__((unused))int signum){
64
53
interrupted_by_signal = 1;
65
signal_received = signum;
66
54
}
67
55
68
56
int main(__attribute__((unused))int argc,
69
57
__attribute__((unused))char **argv){
70
58
int ret = 0;
59
60
/* Create prompt string */
71
61
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;
76
77
/* Create prompt string */
78
62
{
79
63
const char *const cryptsource = getenv("cryptsource");
80
64
const char *const crypttarget = getenv("crypttarget");
97
81
}
98
82
}
99
83
if(ret == -1){
100
prompt = NULL;
101
exitstatus = EX_OSERR;
102
goto failure;
84
return EXIT_FAILURE;
103
85
}
104
86
}
105
87
106
88
/* Find splashy process */
89
pid_t splashy_pid = 0;
107
90
{
108
91
const char splashy_name[] = "/sbin/splashy";
109
proc_dir = opendir("/proc");
92
DIR *proc_dir = opendir("/proc");
110
93
if(proc_dir == NULL){
111
int e = errno;
94
free(prompt);
112
95
perror("opendir");
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;
96
return EXIT_FAILURE;
129
97
}
130
98
for(struct dirent *proc_ent = readdir(proc_dir);
131
99
proc_ent != NULL;
152
120
ret = asprintf(&exe_link, "/proc/%s/exe", proc_ent->d_name);
153
121
if(ret == -1){
154
122
perror("asprintf");
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exitstatus = EX_OSERR;
156
goto failure;
123
free(prompt);
124
closedir(proc_dir);
125
return EXIT_FAILURE;
157
126
}
158
127
159
128
/* Check that it refers to a symlink owned by root:root */
164
133
free(exe_link);
165
134
continue;
166
135
}
167
int e = errno;
168
136
perror("lstat");
169
137
free(exe_link);
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;
138
free(prompt);
139
closedir(proc_dir);
140
return EXIT_FAILURE;
182
141
}
183
142
if(not S_ISLNK(exe_stat.st_mode)
184
143
or exe_stat.st_uid != 0
198
157
}
199
158
}
200
159
closedir(proc_dir);
201
proc_dir = NULL;
202
160
}
203
161
if(splashy_pid == 0){
204
exitstatus = EX_UNAVAILABLE;
205
goto failure;
162
free(prompt);
163
return EXIT_FAILURE;
206
164
}
207
165
208
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/* Set up the signal handler */
211
169
new_action = { .sa_handler = termination_handler,
212
170
.sa_flags = 0 };
213
171
sigemptyset(&new_action.sa_mask);
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;
231
}
172
sigaddset(&new_action.sa_mask, SIGINT);
173
sigaddset(&new_action.sa_mask, SIGHUP);
174
sigaddset(&new_action.sa_mask, SIGTERM);
232
175
ret = sigaction(SIGINT, NULL, &old_action);
233
176
if(ret == -1){
234
177
perror("sigaction");
235
exitstatus = EX_OSERR;
236
goto failure;
178
free(prompt);
179
return EXIT_FAILURE;
237
180
}
238
181
if(old_action.sa_handler != SIG_IGN){
239
182
ret = sigaction(SIGINT, &new_action, NULL);
240
183
if(ret == -1){
241
184
perror("sigaction");
242
exitstatus = EX_OSERR;
243
goto failure;
185
free(prompt);
186
return EXIT_FAILURE;
244
187
}
245
188
}
246
189
ret = sigaction(SIGHUP, NULL, &old_action);
247
190
if(ret == -1){
248
191
perror("sigaction");
249
exitstatus = EX_OSERR;
250
goto failure;
192
free(prompt);
193
return EXIT_FAILURE;
251
194
}
252
195
if(old_action.sa_handler != SIG_IGN){
253
196
ret = sigaction(SIGHUP, &new_action, NULL);
254
197
if(ret == -1){
255
198
perror("sigaction");
256
exitstatus = EX_OSERR;
257
goto failure;
199
free(prompt);
200
return EXIT_FAILURE;
258
201
}
259
202
}
260
203
ret = sigaction(SIGTERM, NULL, &old_action);
261
204
if(ret == -1){
262
205
perror("sigaction");
263
exitstatus = EX_OSERR;
264
goto failure;
206
free(prompt);
207
return EXIT_FAILURE;
265
208
}
266
209
if(old_action.sa_handler != SIG_IGN){
267
210
ret = sigaction(SIGTERM, &new_action, NULL);
268
211
if(ret == -1){
269
212
perror("sigaction");
270
exitstatus = EX_OSERR;
271
goto failure;
213
free(prompt);
214
return EXIT_FAILURE;
272
215
}
273
216
}
274
217
}
275
218
276
if(interrupted_by_signal){
277
goto failure;
278
}
279
280
219
/* Fork off the splashy command to prompt for password */
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){
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){
293
231
const char splashy_command[] = "/sbin/splashy_update";
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);
232
ret = execl(splashy_command, splashy_command, prompt,
233
(char *)NULL);
234
if(not interrupted_by_signal){
235
perror("execl");
319
236
}
237
free(prompt);
238
_exit(EXIT_FAILURE);
320
239
}
321
free(prompt);
322
_exit(EXIT_FAILURE);
323
240
}
324
241
325
242
/* Parent */
326
243
free(prompt);
327
prompt = NULL;
328
329
if(interrupted_by_signal){
330
goto failure;
331
}
332
244
333
245
/* Wait for command to complete */
334
{
246
if(not interrupted_by_signal and splashy_command_pid != 0){
335
247
int status;
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
}
248
ret = waitpid(splashy_command_pid, &status, 0);
343
249
if(ret == -1){
344
perror("waitpid");
250
if(errno != EINTR){
251
perror("waitpid");
252
}
345
253
if(errno == ECHILD){
346
254
splashy_command_pid = 0;
347
255
}
348
256
} else {
349
257
/* The child process has exited */
350
258
splashy_command_pid = 0;
351
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
259
if(not interrupted_by_signal and WIFEXITED(status)
260
and WEXITSTATUS(status)==0){
352
261
return EXIT_SUCCESS;
353
262
}
354
263
}
355
264
}
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;
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;
441
304
}
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