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- Committer: teddy at bsnet
- Date: 2010-09-27 17:53:53 UTC
- Revision ID: teddy@fukt.bsnet.se-20100927175353-skms2ds4cjswpf4t
* debian/mandos-client.README.Debian: Remove warning about --connect
not looping, since it now does.
not looping, since it now does.
added
removed
plugins.d/splashy.c
2
2
/*
3
3
* Splashy - Read a password from splashy and output it
4
4
*
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
5
* Copyright © 2008-2010 Teddy Hogeborn
6
* Copyright © 2008-2010 Björn Påhlsson
7
7
*
8
8
* This program is free software: you can redistribute it and/or
9
9
* modify it under the terms of the GNU General Public License as
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,
30
29
SIG_IGN, kill(), SIGKILL */
31
30
#include <stddef.h> /* NULL */
32
31
#include <stdlib.h> /* getenv() */
33
#include <stdio.h> /* asprintf(), perror() */
32
#include <stdio.h> /* asprintf() */
34
33
#include <stdlib.h> /* EXIT_FAILURE, free(),
35
34
EXIT_SUCCESS */
36
35
#include <sys/types.h> /* pid_t, DIR, struct dirent,
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 */
52
#include <error.h> /* error() */
47
53
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
48
54
WEXITSTATUS() */
55
#include <sysexits.h> /* EX_OSERR, EX_OSFILE,
56
EX_UNAVAILABLE */
49
57
50
58
sig_atomic_t interrupted_by_signal = 0;
59
int signal_received;
51
60
52
static void termination_handler(__attribute__((unused))int signum){
61
static void termination_handler(int signum){
62
if(interrupted_by_signal){
63
return;
64
}
53
65
interrupted_by_signal = 1;
66
signal_received = signum;
54
67
}
55
68
56
69
int main(__attribute__((unused))int argc,
57
70
__attribute__((unused))char **argv){
58
71
int ret = 0;
72
char *prompt = NULL;
73
DIR *proc_dir = NULL;
74
pid_t splashy_pid = 0;
75
pid_t splashy_command_pid = 0;
76
int exitstatus = EXIT_FAILURE;
59
77
60
78
/* Create prompt string */
61
char *prompt = NULL;
62
79
{
63
80
const char *const cryptsource = getenv("cryptsource");
64
81
const char *const crypttarget = getenv("crypttarget");
81
98
}
82
99
}
83
100
if(ret == -1){
84
return EXIT_FAILURE;
101
prompt = NULL;
102
exitstatus = EX_OSERR;
103
goto failure;
85
104
}
86
105
}
87
106
88
107
/* Find splashy process */
89
pid_t splashy_pid = 0;
90
108
{
91
109
const char splashy_name[] = "/sbin/splashy";
92
DIR *proc_dir = opendir("/proc");
110
proc_dir = opendir("/proc");
93
111
if(proc_dir == NULL){
94
free(prompt);
95
perror("opendir");
96
return EXIT_FAILURE;
112
int e = errno;
113
error(0, errno, "opendir");
114
switch(e){
115
case EACCES:
116
case ENOTDIR:
117
case ELOOP:
118
case ENOENT:
119
default:
120
exitstatus = EX_OSFILE;
121
break;
122
case ENAMETOOLONG:
123
case EMFILE:
124
case ENFILE:
125
case ENOMEM:
126
exitstatus = EX_OSERR;
127
break;
128
}
129
goto failure;
97
130
}
98
131
for(struct dirent *proc_ent = readdir(proc_dir);
99
132
proc_ent != NULL;
119
152
char *exe_link;
120
153
ret = asprintf(&exe_link, "/proc/%s/exe", proc_ent->d_name);
121
154
if(ret == -1){
122
perror("asprintf");
123
free(prompt);
124
closedir(proc_dir);
125
return EXIT_FAILURE;
155
error(0, errno, "asprintf");
156
exitstatus = EX_OSERR;
157
goto failure;
126
158
}
127
159
128
160
/* Check that it refers to a symlink owned by root:root */
133
165
free(exe_link);
134
166
continue;
135
167
}
136
perror("lstat");
168
int e = errno;
169
error(0, errno, "lstat");
137
170
free(exe_link);
138
free(prompt);
139
closedir(proc_dir);
140
return EXIT_FAILURE;
171
switch(e){
172
case EACCES:
173
case ENOTDIR:
174
case ELOOP:
175
default:
176
exitstatus = EX_OSFILE;
177
break;
178
case ENAMETOOLONG:
179
exitstatus = EX_OSERR;
180
break;
181
}
182
goto failure;
141
183
}
142
184
if(not S_ISLNK(exe_stat.st_mode)
143
185
or exe_stat.st_uid != 0
157
199
}
158
200
}
159
201
closedir(proc_dir);
202
proc_dir = NULL;
160
203
}
161
204
if(splashy_pid == 0){
162
free(prompt);
163
return EXIT_FAILURE;
205
exitstatus = EX_UNAVAILABLE;
206
goto failure;
164
207
}
165
208
166
209
/* Set up the signal handler */
169
212
new_action = { .sa_handler = termination_handler,
170
213
.sa_flags = 0 };
171
214
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);
215
ret = sigaddset(&new_action.sa_mask, SIGINT);
216
if(ret == -1){
217
error(0, errno, "sigaddset");
218
exitstatus = EX_OSERR;
219
goto failure;
220
}
221
ret = sigaddset(&new_action.sa_mask, SIGHUP);
222
if(ret == -1){
223
error(0, errno, "sigaddset");
224
exitstatus = EX_OSERR;
225
goto failure;
226
}
227
ret = sigaddset(&new_action.sa_mask, SIGTERM);
228
if(ret == -1){
229
error(0, errno, "sigaddset");
230
exitstatus = EX_OSERR;
231
goto failure;
232
}
175
233
ret = sigaction(SIGINT, NULL, &old_action);
176
234
if(ret == -1){
177
perror("sigaction");
178
free(prompt);
179
return EXIT_FAILURE;
235
error(0, errno, "sigaction");
236
exitstatus = EX_OSERR;
237
goto failure;
180
238
}
181
239
if(old_action.sa_handler != SIG_IGN){
182
240
ret = sigaction(SIGINT, &new_action, NULL);
183
241
if(ret == -1){
184
perror("sigaction");
185
free(prompt);
186
return EXIT_FAILURE;
242
error(0, errno, "sigaction");
243
exitstatus = EX_OSERR;
244
goto failure;
187
245
}
188
246
}
189
247
ret = sigaction(SIGHUP, NULL, &old_action);
190
248
if(ret == -1){
191
perror("sigaction");
192
free(prompt);
193
return EXIT_FAILURE;
249
error(0, errno, "sigaction");
250
exitstatus = EX_OSERR;
251
goto failure;
194
252
}
195
253
if(old_action.sa_handler != SIG_IGN){
196
254
ret = sigaction(SIGHUP, &new_action, NULL);
197
255
if(ret == -1){
198
perror("sigaction");
199
free(prompt);
200
return EXIT_FAILURE;
256
error(0, errno, "sigaction");
257
exitstatus = EX_OSERR;
258
goto failure;
201
259
}
202
260
}
203
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ret = sigaction(SIGTERM, NULL, &old_action);
204
262
if(ret == -1){
205
perror("sigaction");
206
free(prompt);
207
return EXIT_FAILURE;
263
error(0, errno, "sigaction");
264
exitstatus = EX_OSERR;
265
goto failure;
208
266
}
209
267
if(old_action.sa_handler != SIG_IGN){
210
268
ret = sigaction(SIGTERM, &new_action, NULL);
211
269
if(ret == -1){
212
perror("sigaction");
213
free(prompt);
214
return EXIT_FAILURE;
270
error(0, errno, "sigaction");
271
exitstatus = EX_OSERR;
272
goto failure;
215
273
}
216
274
}
217
275
}
218
276
277
if(interrupted_by_signal){
278
goto failure;
279
}
280
219
281
/* 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){
282
splashy_command_pid = fork();
283
if(splashy_command_pid != 0 and interrupted_by_signal){
284
goto failure;
285
}
286
if(splashy_command_pid == -1){
287
error(0, errno, "fork");
288
exitstatus = EX_OSERR;
289
goto failure;
290
}
291
/* Child */
292
if(splashy_command_pid == 0){
293
if(not interrupted_by_signal){
231
294
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");
295
execl(splashy_command, splashy_command, prompt, (char *)NULL);
296
int e = errno;
297
error(0, errno, "execl");
298
switch(e){
299
case EACCES:
300
case ENOENT:
301
case ENOEXEC:
302
case EINVAL:
303
_exit(EX_UNAVAILABLE);
304
case ENAMETOOLONG:
305
case E2BIG:
306
case ENOMEM:
307
case EFAULT:
308
case EIO:
309
case EMFILE:
310
case ENFILE:
311
case ETXTBSY:
312
default:
313
_exit(EX_OSERR);
314
case ENOTDIR:
315
case ELOOP:
316
case EISDIR:
317
case ELIBBAD:
318
case EPERM:
319
_exit(EX_OSFILE);
236
320
}
237
free(prompt);
238
_exit(EXIT_FAILURE);
239
321
}
322
free(prompt);
323
_exit(EXIT_FAILURE);
240
324
}
241
325
242
326
/* Parent */
243
327
free(prompt);
328
prompt = NULL;
329
330
if(interrupted_by_signal){
331
goto failure;
332
}
244
333
245
334
/* Wait for command to complete */
246
if(not interrupted_by_signal and splashy_command_pid != 0){
335
{
247
336
int status;
248
ret = waitpid(splashy_command_pid, &status, 0);
337
do {
338
ret = waitpid(splashy_command_pid, &status, 0);
339
} while(ret == -1 and errno == EINTR
340
and not interrupted_by_signal);
341
if(interrupted_by_signal){
342
goto failure;
343
}
249
344
if(ret == -1){
250
if(errno != EINTR){
251
perror("waitpid");
252
}
345
error(0, errno, "waitpid");
253
346
if(errno == ECHILD){
254
347
splashy_command_pid = 0;
255
348
}
256
349
} else {
257
350
/* The child process has exited */
258
351
splashy_command_pid = 0;
259
if(not interrupted_by_signal and WIFEXITED(status)
260
and WEXITSTATUS(status)==0){
352
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
261
353
return EXIT_SUCCESS;
262
354
}
263
355
}
264
356
}
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;
357
358
failure:
359
360
free(prompt);
361
362
if(proc_dir != NULL){
363
TEMP_FAILURE_RETRY(closedir(proc_dir));
364
}
365
366
if(splashy_command_pid != 0){
367
TEMP_FAILURE_RETRY(kill(splashy_command_pid, SIGTERM));
368
369
TEMP_FAILURE_RETRY(kill(splashy_pid, SIGTERM));
370
sleep(2);
371
while(TEMP_FAILURE_RETRY(kill(splashy_pid, 0)) == 0){
372
TEMP_FAILURE_RETRY(kill(splashy_pid, SIGKILL));
373
sleep(1);
374
}
375
pid_t new_splashy_pid = (pid_t)TEMP_FAILURE_RETRY(fork());
376
if(new_splashy_pid == 0){
377
/* Child; will become new splashy process */
378
379
/* Make the effective user ID (root) the only user ID instead of
380
the real user ID (_mandos) */
381
ret = setuid(geteuid());
382
if(ret == -1){
383
error(0, errno, "setuid");
384
}
385
386
setsid();
387
ret = chdir("/");
388
if(ret == -1){
389
error(0, errno, "chdir");
390
}
391
/* if(fork() != 0){ */
392
/* _exit(EXIT_SUCCESS); */
393
/* } */
394
ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace stdout */
395
if(ret == -1){
396
error(0, errno, "dup2");
397
_exit(EX_OSERR);
398
}
399
400
execl("/sbin/splashy", "/sbin/splashy", "boot", (char *)NULL);
401
{
402
int e = errno;
403
error(0, errno, "execl");
404
switch(e){
405
case EACCES:
406
case ENOENT:
407
case ENOEXEC:
408
default:
409
_exit(EX_UNAVAILABLE);
410
case ENAMETOOLONG:
411
case E2BIG:
412
case ENOMEM:
413
_exit(EX_OSERR);
414
case ENOTDIR:
415
case ELOOP:
416
_exit(EX_OSFILE);
417
}
418
}
419
}
420
}
421
422
if(interrupted_by_signal){
423
struct sigaction signal_action;
424
sigemptyset(&signal_action.sa_mask);
425
signal_action.sa_handler = SIG_DFL;
426
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
427
&signal_action, NULL));
428
if(ret == -1){
429
error(0, errno, "sigaction");
430
}
431
do {
432
ret = raise(signal_received);
433
} while(ret != 0 and errno == EINTR);
434
if(ret != 0){
435
error(0, errno, "raise");
436
abort();
437
}
438
TEMP_FAILURE_RETRY(pause());
439
}
440
441
return exitstatus;
304
442
}
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