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- Committer: Teddy Hogeborn
- Date: 2009-11-05 19:16:46 UTC
- Revision ID: teddy@fukt.bsnet.se-20091105191646-5l7bkq5h4wkh3huh
* mandos-monitor: New prototype version of interactive server
administraton tool using D-Bus.
administraton tool using D-Bus.
- files added:
- mandos-monitor
- 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>.
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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;
58
int signal_received;
51
59
52
static void termination_handler(__attribute__((unused))int signum){
60
static void termination_handler(int signum){
61
if(interrupted_by_signal){
62
return;
63
}
53
64
interrupted_by_signal = 1;
65
signal_received = signum;
54
66
}
55
67
56
68
int main(__attribute__((unused))int argc,
57
69
__attribute__((unused))char **argv){
58
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;
59
76
60
77
/* Create prompt string */
61
char *prompt = NULL;
62
78
{
63
79
const char *const cryptsource = getenv("cryptsource");
64
80
const char *const crypttarget = getenv("crypttarget");
81
97
}
82
98
}
83
99
if(ret == -1){
84
return EXIT_FAILURE;
100
prompt = NULL;
101
exitstatus = EX_OSERR;
102
goto failure;
85
103
}
86
104
}
87
105
88
106
/* Find splashy process */
89
pid_t splashy_pid = 0;
90
107
{
91
108
const char splashy_name[] = "/sbin/splashy";
92
DIR *proc_dir = opendir("/proc");
109
proc_dir = opendir("/proc");
93
110
if(proc_dir == NULL){
94
free(prompt);
111
int e = errno;
95
112
perror("opendir");
96
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;
97
129
}
98
130
for(struct dirent *proc_ent = readdir(proc_dir);
99
131
proc_ent != NULL;
120
152
ret = asprintf(&exe_link, "/proc/%s/exe", proc_ent->d_name);
121
153
if(ret == -1){
122
154
perror("asprintf");
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free(prompt);
124
closedir(proc_dir);
125
return EXIT_FAILURE;
155
exitstatus = EX_OSERR;
156
goto failure;
126
157
}
127
158
128
159
/* Check that it refers to a symlink owned by root:root */
133
164
free(exe_link);
134
165
continue;
135
166
}
167
int e = errno;
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perror("lstat");
137
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free(exe_link);
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free(prompt);
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closedir(proc_dir);
140
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;
141
182
}
142
183
if(not S_ISLNK(exe_stat.st_mode)
143
184
or exe_stat.st_uid != 0
157
198
}
158
199
}
159
200
closedir(proc_dir);
201
proc_dir = NULL;
160
202
}
161
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if(splashy_pid == 0){
162
free(prompt);
163
return EXIT_FAILURE;
204
exitstatus = EX_UNAVAILABLE;
205
goto failure;
164
206
}
165
207
166
208
/* Set up the signal handler */
169
211
new_action = { .sa_handler = termination_handler,
170
212
.sa_flags = 0 };
171
213
sigemptyset(&new_action.sa_mask);
172
sigaddset(&new_action.sa_mask, SIGINT);
173
sigaddset(&new_action.sa_mask, SIGHUP);
174
sigaddset(&new_action.sa_mask, SIGTERM);
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
}
175
232
ret = sigaction(SIGINT, NULL, &old_action);
176
233
if(ret == -1){
177
234
perror("sigaction");
178
free(prompt);
179
return EXIT_FAILURE;
235
exitstatus = EX_OSERR;
236
goto failure;
180
237
}
181
238
if(old_action.sa_handler != SIG_IGN){
182
239
ret = sigaction(SIGINT, &new_action, NULL);
183
240
if(ret == -1){
184
241
perror("sigaction");
185
free(prompt);
186
return EXIT_FAILURE;
242
exitstatus = EX_OSERR;
243
goto failure;
187
244
}
188
245
}
189
246
ret = sigaction(SIGHUP, NULL, &old_action);
190
247
if(ret == -1){
191
248
perror("sigaction");
192
free(prompt);
193
return EXIT_FAILURE;
249
exitstatus = EX_OSERR;
250
goto failure;
194
251
}
195
252
if(old_action.sa_handler != SIG_IGN){
196
253
ret = sigaction(SIGHUP, &new_action, NULL);
197
254
if(ret == -1){
198
255
perror("sigaction");
199
free(prompt);
200
return EXIT_FAILURE;
256
exitstatus = EX_OSERR;
257
goto failure;
201
258
}
202
259
}
203
260
ret = sigaction(SIGTERM, NULL, &old_action);
204
261
if(ret == -1){
205
262
perror("sigaction");
206
free(prompt);
207
return EXIT_FAILURE;
263
exitstatus = EX_OSERR;
264
goto failure;
208
265
}
209
266
if(old_action.sa_handler != SIG_IGN){
210
267
ret = sigaction(SIGTERM, &new_action, NULL);
211
268
if(ret == -1){
212
269
perror("sigaction");
213
free(prompt);
214
return EXIT_FAILURE;
270
exitstatus = EX_OSERR;
271
goto failure;
215
272
}
216
273
}
217
274
}
218
275
276
if(interrupted_by_signal){
277
goto failure;
278
}
279
219
280
/* Fork off the splashy command to prompt for password */
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){
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){
231
293
const char splashy_command[] = "/sbin/splashy_update";
232
ret = execl(splashy_command, splashy_command, prompt,
233
(char *)NULL);
234
if(not interrupted_by_signal){
235
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);
236
319
}
237
free(prompt);
238
_exit(EXIT_FAILURE);
239
320
}
321
free(prompt);
322
_exit(EXIT_FAILURE);
240
323
}
241
324
242
325
/* Parent */
243
326
free(prompt);
327
prompt = NULL;
328
329
if(interrupted_by_signal){
330
goto failure;
331
}
244
332
245
333
/* Wait for command to complete */
246
if(not interrupted_by_signal and splashy_command_pid != 0){
334
{
247
335
int status;
248
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
}
249
343
if(ret == -1){
250
if(errno != EINTR){
251
perror("waitpid");
252
}
344
perror("waitpid");
253
345
if(errno == ECHILD){
254
346
splashy_command_pid = 0;
255
347
}
256
348
} else {
257
349
/* The child process has exited */
258
350
splashy_command_pid = 0;
259
if(not interrupted_by_signal and WIFEXITED(status)
260
and WEXITSTATUS(status)==0){
351
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
261
352
return EXIT_SUCCESS;
262
353
}
263
354
}
264
355
}
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;
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;
304
441
}
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