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- Committer: Björn Påhlsson
- Date: 2009-01-10 21:49:25 UTC
- mfrom: (237.2.25 mandos)
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 245.
- Revision ID: belorn@braxen-20090110214925-f0y2sjhb0br4nexb
merge
- files removed:
- dbus-mandos.conf
- files modified:
- INSTALL
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,
30
31
#include <stddef.h> /* NULL */
31
32
#include <stdlib.h> /* getenv() */
32
33
#include <stdio.h> /* asprintf(), perror() */
33
#include <stdlib.h> /* EXIT_FAILURE, free(),
34
#include <stdlib.h> /* EXIT_FAILURE, free(), strtoul(),
34
35
EXIT_SUCCESS */
35
36
#include <sys/types.h> /* pid_t, DIR, struct dirent,
36
37
ssize_t */
37
38
#include <dirent.h> /* opendir(), readdir(), closedir() */
38
#include <inttypes.h> /* intmax_t, strtoimax() */
39
39
#include <sys/stat.h> /* struct stat, lstat(), S_ISLNK */
40
40
#include <iso646.h> /* not, or, and */
41
41
#include <unistd.h> /* readlink(), fork(), execl(),
42
42
sleep(), dup2() STDERR_FILENO,
43
STDOUT_FILENO, _exit(),
44
pause() */
43
STDOUT_FILENO, _exit() */
45
44
#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 */
45
#include <errno.h> /* errno */
52
46
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
53
47
WEXITSTATUS() */
54
#include <sysexits.h> /* EX_OSERR, EX_OSFILE,
55
EX_UNAVAILABLE */
56
48
57
49
sig_atomic_t interrupted_by_signal = 0;
58
int signal_received;
59
50
60
static void termination_handler(int signum){
61
if(interrupted_by_signal){
62
return;
63
}
51
static void termination_handler(__attribute__((unused))int signum){
64
52
interrupted_by_signal = 1;
65
signal_received = signum;
66
53
}
67
54
68
55
int main(__attribute__((unused))int argc,
69
56
__attribute__((unused))char **argv){
70
57
int ret = 0;
58
59
/* Create prompt string */
71
60
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
61
{
79
62
const char *const cryptsource = getenv("cryptsource");
80
63
const char *const crypttarget = getenv("crypttarget");
97
80
}
98
81
}
99
82
if(ret == -1){
100
prompt = NULL;
101
exitstatus = EX_OSERR;
102
goto failure;
83
return EXIT_FAILURE;
103
84
}
104
85
}
105
86
106
87
/* Find splashy process */
88
pid_t splashy_pid = 0;
107
89
{
108
90
const char splashy_name[] = "/sbin/splashy";
109
proc_dir = opendir("/proc");
91
DIR *proc_dir = opendir("/proc");
110
92
if(proc_dir == NULL){
111
int e = errno;
93
free(prompt);
112
94
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;
95
return EXIT_FAILURE;
129
96
}
130
97
for(struct dirent *proc_ent = readdir(proc_dir);
131
98
proc_ent != NULL;
132
99
proc_ent = readdir(proc_dir)){
133
pid_t pid;
134
{
135
intmax_t tmpmax;
136
char *tmp;
137
errno = 0;
138
tmpmax = strtoimax(proc_ent->d_name, &tmp, 10);
139
if(errno != 0 or tmp == proc_ent->d_name or *tmp != '\0'
140
or tmpmax != (pid_t)tmpmax){
141
/* Not a process */
142
continue;
143
}
144
pid = (pid_t)tmpmax;
100
pid_t pid = (pid_t) strtoul(proc_ent->d_name, NULL, 10);
101
if(pid == 0){
102
/* Not a process */
103
continue;
145
104
}
146
105
/* Find the executable name by doing readlink() on the
147
106
/proc/<pid>/exe link */
152
111
ret = asprintf(&exe_link, "/proc/%s/exe", proc_ent->d_name);
153
112
if(ret == -1){
154
113
perror("asprintf");
155
exitstatus = EX_OSERR;
156
goto failure;
114
free(prompt);
115
closedir(proc_dir);
116
return EXIT_FAILURE;
157
117
}
158
118
159
119
/* Check that it refers to a symlink owned by root:root */
164
124
free(exe_link);
165
125
continue;
166
126
}
167
int e = errno;
168
127
perror("lstat");
169
128
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;
129
free(prompt);
130
closedir(proc_dir);
131
return EXIT_FAILURE;
182
132
}
183
133
if(not S_ISLNK(exe_stat.st_mode)
184
134
or exe_stat.st_uid != 0
198
148
}
199
149
}
200
150
closedir(proc_dir);
201
proc_dir = NULL;
202
151
}
203
152
if(splashy_pid == 0){
204
exitstatus = EX_UNAVAILABLE;
205
goto failure;
153
free(prompt);
154
return EXIT_FAILURE;
206
155
}
207
156
208
157
/* Set up the signal handler */
211
160
new_action = { .sa_handler = termination_handler,
212
161
.sa_flags = 0 };
213
162
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
}
163
sigaddset(&new_action.sa_mask, SIGINT);
164
sigaddset(&new_action.sa_mask, SIGHUP);
165
sigaddset(&new_action.sa_mask, SIGTERM);
232
166
ret = sigaction(SIGINT, NULL, &old_action);
233
167
if(ret == -1){
234
168
perror("sigaction");
235
exitstatus = EX_OSERR;
236
goto failure;
169
free(prompt);
170
return EXIT_FAILURE;
237
171
}
238
172
if(old_action.sa_handler != SIG_IGN){
239
173
ret = sigaction(SIGINT, &new_action, NULL);
240
174
if(ret == -1){
241
175
perror("sigaction");
242
exitstatus = EX_OSERR;
243
goto failure;
176
free(prompt);
177
return EXIT_FAILURE;
244
178
}
245
179
}
246
180
ret = sigaction(SIGHUP, NULL, &old_action);
247
181
if(ret == -1){
248
182
perror("sigaction");
249
exitstatus = EX_OSERR;
250
goto failure;
183
free(prompt);
184
return EXIT_FAILURE;
251
185
}
252
186
if(old_action.sa_handler != SIG_IGN){
253
187
ret = sigaction(SIGHUP, &new_action, NULL);
254
188
if(ret == -1){
255
189
perror("sigaction");
256
exitstatus = EX_OSERR;
257
goto failure;
190
free(prompt);
191
return EXIT_FAILURE;
258
192
}
259
193
}
260
194
ret = sigaction(SIGTERM, NULL, &old_action);
261
195
if(ret == -1){
262
196
perror("sigaction");
263
exitstatus = EX_OSERR;
264
goto failure;
197
free(prompt);
198
return EXIT_FAILURE;
265
199
}
266
200
if(old_action.sa_handler != SIG_IGN){
267
201
ret = sigaction(SIGTERM, &new_action, NULL);
268
202
if(ret == -1){
269
203
perror("sigaction");
270
exitstatus = EX_OSERR;
271
goto failure;
204
free(prompt);
205
return EXIT_FAILURE;
272
206
}
273
207
}
274
208
}
275
209
276
if(interrupted_by_signal){
277
goto failure;
278
}
279
280
210
/* 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){
211
pid_t splashy_command_pid = 0;
212
if(not interrupted_by_signal){
213
splashy_command_pid = fork();
214
if(splashy_command_pid == -1){
215
if(not interrupted_by_signal){
216
perror("fork");
217
}
218
return EXIT_FAILURE;
219
}
220
/* Child */
221
if(splashy_command_pid == 0){
293
222
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);
223
ret = execl(splashy_command, splashy_command, prompt,
224
(char *)NULL);
225
if(not interrupted_by_signal){
226
perror("execl");
319
227
}
228
free(prompt);
229
_exit(EXIT_FAILURE);
320
230
}
321
free(prompt);
322
_exit(EXIT_FAILURE);
323
231
}
324
232
325
233
/* Parent */
326
234
free(prompt);
327
prompt = NULL;
328
329
if(interrupted_by_signal){
330
goto failure;
331
}
332
235
333
236
/* Wait for command to complete */
334
{
237
if(not interrupted_by_signal and splashy_command_pid != 0){
335
238
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
}
239
ret = waitpid(splashy_command_pid, &status, 0);
343
240
if(ret == -1){
344
perror("waitpid");
241
if(errno != EINTR){
242
perror("waitpid");
243
}
345
244
if(errno == ECHILD){
346
245
splashy_command_pid = 0;
347
246
}
348
247
} else {
349
248
/* The child process has exited */
350
249
splashy_command_pid = 0;
351
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
250
if(not interrupted_by_signal and WIFEXITED(status)
251
and WEXITSTATUS(status)==0){
352
252
return EXIT_SUCCESS;
353
253
}
354
254
}
355
255
}
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;
256
kill(splashy_pid, SIGTERM);
257
if(interrupted_by_signal and splashy_command_pid != 0){
258
kill(splashy_command_pid, SIGTERM);
259
}
260
sleep(2);
261
while(kill(splashy_pid, 0) == 0){
262
kill(splashy_pid, SIGKILL);
263
sleep(1);
264
}
265
pid_t new_splashy_pid = fork();
266
if(new_splashy_pid == 0){
267
/* Child; will become new splashy process */
268
269
/* Make the effective user ID (root) the only user ID instead of
270
the real user ID (mandos) */
271
ret = setuid(geteuid());
272
if(ret == -1){
273
perror("setuid");
274
}
275
276
setsid();
277
ret = chdir("/");
278
/* if(fork() != 0){ */
279
/* _exit(EXIT_SUCCESS); */
280
/* } */
281
ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
282
if(ret == -1){
283
perror("dup2");
284
_exit(EXIT_FAILURE);
285
}
286
287
execl("/sbin/splashy", "/sbin/splashy", "boot", (char *)NULL);
288
if(not interrupted_by_signal){
289
perror("execl");
290
}
291
_exit(EXIT_FAILURE);
292
}
293
294
return EXIT_FAILURE;
441
295
}
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