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- Committer: Teddy Hogeborn
- Date: 2009-05-17 00:50:09 UTC
- mto: (24.1.170 mandos) (237.4.29 release)
- mto: This revision was merged to the branch mainline in revision 343.
- Revision ID: teddy@fukt.bsnet.se-20090517005009-c0iptxampo6nf177
* initramfs-tools-hook-conf: Security bug fix: Add code to handle
being called by "mkinitramfs-kpkg"
instead of "update-initramfs".
being called by "mkinitramfs-kpkg"
instead of "update-initramfs".
- files removed:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/splashy.c
2
2
/*
3
3
* Splashy - Read a password from splashy and output it
4
4
*
5
* Copyright © 2008-2014 Teddy Hogeborn
6
* Copyright © 2008-2014 Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 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 <mandos@recompile.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,
29
30
SIG_IGN, kill(), SIGKILL */
30
31
#include <stddef.h> /* NULL */
31
32
#include <stdlib.h> /* getenv() */
32
#include <stdio.h> /* asprintf(), vasprintf(), vprintf(),
33
fprintf() */
33
#include <stdio.h> /* asprintf(), perror() */
34
34
#include <stdlib.h> /* EXIT_FAILURE, free(),
35
35
EXIT_SUCCESS */
36
36
#include <sys/types.h> /* pid_t, DIR, struct dirent,
41
41
#include <iso646.h> /* not, or, and */
42
42
#include <unistd.h> /* readlink(), fork(), execl(),
43
43
sleep(), dup2() STDERR_FILENO,
44
STDOUT_FILENO, _exit(),
45
pause() */
46
#include <string.h> /* memcmp(), strerror() */
47
#include <errno.h> /* errno, EACCES, ENOTDIR, ELOOP,
48
ENOENT, ENAMETOOLONG, EMFILE,
49
ENFILE, ENOMEM, ENOEXEC, EINVAL,
50
E2BIG, EFAULT, EIO, ETXTBSY,
51
EISDIR, ELIBBAD, EPERM, EINTR,
52
ECHILD */
53
#include <error.h> /* error() */
44
STDOUT_FILENO, _exit() */
45
#include <string.h> /* memcmp() */
46
#include <errno.h> /* errno */
54
47
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
55
48
WEXITSTATUS() */
56
#include <sysexits.h> /* EX_OSERR, EX_OSFILE,
57
EX_UNAVAILABLE */
58
#include <stdarg.h> /* va_list, va_start(), ... */
59
49
60
50
sig_atomic_t interrupted_by_signal = 0;
61
int signal_received;
62
63
/* Function to use when printing errors */
64
__attribute__((format (gnu_printf, 3, 4)))
65
void error_plus(int status, int errnum, const char *formatstring,
66
...){
67
va_list ap;
68
char *text;
69
int ret;
70
71
va_start(ap, formatstring);
72
ret = vasprintf(&text, formatstring, ap);
73
if(ret == -1){
74
fprintf(stderr, "Mandos plugin %s: ",
75
program_invocation_short_name);
76
vfprintf(stderr, formatstring, ap);
77
fprintf(stderr, ": ");
78
fprintf(stderr, "%s\n", strerror(errnum));
79
error(status, errno, "vasprintf while printing error");
80
return;
81
}
82
fprintf(stderr, "Mandos plugin ");
83
error(status, errnum, "%s", text);
84
free(text);
85
}
86
87
88
static void termination_handler(int signum){
89
if(interrupted_by_signal){
90
return;
91
}
51
52
static void termination_handler(__attribute__((unused))int signum){
92
53
interrupted_by_signal = 1;
93
signal_received = signum;
94
54
}
95
55
96
56
int main(__attribute__((unused))int argc,
97
57
__attribute__((unused))char **argv){
98
58
int ret = 0;
59
60
/* Create prompt string */
99
61
char *prompt = NULL;
100
DIR *proc_dir = NULL;
101
pid_t splashy_pid = 0;
102
pid_t splashy_command_pid = 0;
103
int exitstatus = EXIT_FAILURE;
104
105
/* Create prompt string */
106
62
{
107
63
const char *const cryptsource = getenv("cryptsource");
108
64
const char *const crypttarget = getenv("crypttarget");
125
81
}
126
82
}
127
83
if(ret == -1){
128
prompt = NULL;
129
exitstatus = EX_OSERR;
130
goto failure;
84
return EXIT_FAILURE;
131
85
}
132
86
}
133
87
134
88
/* Find splashy process */
89
pid_t splashy_pid = 0;
135
90
{
136
91
const char splashy_name[] = "/sbin/splashy";
137
proc_dir = opendir("/proc");
92
DIR *proc_dir = opendir("/proc");
138
93
if(proc_dir == NULL){
139
int e = errno;
140
error_plus(0, errno, "opendir");
141
switch(e){
142
case EACCES:
143
case ENOTDIR:
144
case ELOOP:
145
case ENOENT:
146
default:
147
exitstatus = EX_OSFILE;
148
break;
149
case ENAMETOOLONG:
150
case EMFILE:
151
case ENFILE:
152
case ENOMEM:
153
exitstatus = EX_OSERR;
154
break;
155
}
156
goto failure;
94
free(prompt);
95
perror("opendir");
96
return EXIT_FAILURE;
157
97
}
158
98
for(struct dirent *proc_ent = readdir(proc_dir);
159
99
proc_ent != NULL;
179
119
char *exe_link;
180
120
ret = asprintf(&exe_link, "/proc/%s/exe", proc_ent->d_name);
181
121
if(ret == -1){
182
error_plus(0, errno, "asprintf");
183
exitstatus = EX_OSERR;
184
goto failure;
122
perror("asprintf");
123
free(prompt);
124
closedir(proc_dir);
125
return EXIT_FAILURE;
185
126
}
186
127
187
128
/* Check that it refers to a symlink owned by root:root */
192
133
free(exe_link);
193
134
continue;
194
135
}
195
int e = errno;
196
error_plus(0, errno, "lstat");
136
perror("lstat");
197
137
free(exe_link);
198
switch(e){
199
case EACCES:
200
case ENOTDIR:
201
case ELOOP:
202
default:
203
exitstatus = EX_OSFILE;
204
break;
205
case ENAMETOOLONG:
206
exitstatus = EX_OSERR;
207
break;
208
}
209
goto failure;
138
free(prompt);
139
closedir(proc_dir);
140
return EXIT_FAILURE;
210
141
}
211
142
if(not S_ISLNK(exe_stat.st_mode)
212
143
or exe_stat.st_uid != 0
226
157
}
227
158
}
228
159
closedir(proc_dir);
229
proc_dir = NULL;
230
160
}
231
161
if(splashy_pid == 0){
232
exitstatus = EX_UNAVAILABLE;
233
goto failure;
162
free(prompt);
163
return EXIT_FAILURE;
234
164
}
235
165
236
166
/* Set up the signal handler */
239
169
new_action = { .sa_handler = termination_handler,
240
170
.sa_flags = 0 };
241
171
sigemptyset(&new_action.sa_mask);
242
ret = sigaddset(&new_action.sa_mask, SIGINT);
243
if(ret == -1){
244
error_plus(0, errno, "sigaddset");
245
exitstatus = EX_OSERR;
246
goto failure;
247
}
248
ret = sigaddset(&new_action.sa_mask, SIGHUP);
249
if(ret == -1){
250
error_plus(0, errno, "sigaddset");
251
exitstatus = EX_OSERR;
252
goto failure;
253
}
254
ret = sigaddset(&new_action.sa_mask, SIGTERM);
255
if(ret == -1){
256
error_plus(0, errno, "sigaddset");
257
exitstatus = EX_OSERR;
258
goto failure;
259
}
172
sigaddset(&new_action.sa_mask, SIGINT);
173
sigaddset(&new_action.sa_mask, SIGHUP);
174
sigaddset(&new_action.sa_mask, SIGTERM);
260
175
ret = sigaction(SIGINT, NULL, &old_action);
261
176
if(ret == -1){
262
error_plus(0, errno, "sigaction");
263
exitstatus = EX_OSERR;
264
goto failure;
177
perror("sigaction");
178
free(prompt);
179
return EXIT_FAILURE;
265
180
}
266
181
if(old_action.sa_handler != SIG_IGN){
267
182
ret = sigaction(SIGINT, &new_action, NULL);
268
183
if(ret == -1){
269
error_plus(0, errno, "sigaction");
270
exitstatus = EX_OSERR;
271
goto failure;
184
perror("sigaction");
185
free(prompt);
186
return EXIT_FAILURE;
272
187
}
273
188
}
274
189
ret = sigaction(SIGHUP, NULL, &old_action);
275
190
if(ret == -1){
276
error_plus(0, errno, "sigaction");
277
exitstatus = EX_OSERR;
278
goto failure;
191
perror("sigaction");
192
free(prompt);
193
return EXIT_FAILURE;
279
194
}
280
195
if(old_action.sa_handler != SIG_IGN){
281
196
ret = sigaction(SIGHUP, &new_action, NULL);
282
197
if(ret == -1){
283
error_plus(0, errno, "sigaction");
284
exitstatus = EX_OSERR;
285
goto failure;
198
perror("sigaction");
199
free(prompt);
200
return EXIT_FAILURE;
286
201
}
287
202
}
288
203
ret = sigaction(SIGTERM, NULL, &old_action);
289
204
if(ret == -1){
290
error_plus(0, errno, "sigaction");
291
exitstatus = EX_OSERR;
292
goto failure;
205
perror("sigaction");
206
free(prompt);
207
return EXIT_FAILURE;
293
208
}
294
209
if(old_action.sa_handler != SIG_IGN){
295
210
ret = sigaction(SIGTERM, &new_action, NULL);
296
211
if(ret == -1){
297
error_plus(0, errno, "sigaction");
298
exitstatus = EX_OSERR;
299
goto failure;
212
perror("sigaction");
213
free(prompt);
214
return EXIT_FAILURE;
300
215
}
301
216
}
302
217
}
303
218
304
if(interrupted_by_signal){
305
goto failure;
306
}
307
308
219
/* Fork off the splashy command to prompt for password */
309
splashy_command_pid = fork();
310
if(splashy_command_pid != 0 and interrupted_by_signal){
311
goto failure;
312
}
313
if(splashy_command_pid == -1){
314
error_plus(0, errno, "fork");
315
exitstatus = EX_OSERR;
316
goto failure;
317
}
318
/* Child */
319
if(splashy_command_pid == 0){
320
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){
321
231
const char splashy_command[] = "/sbin/splashy_update";
322
execl(splashy_command, splashy_command, prompt, (char *)NULL);
323
int e = errno;
324
error_plus(0, errno, "execl");
325
switch(e){
326
case EACCES:
327
case ENOENT:
328
case ENOEXEC:
329
case EINVAL:
330
_exit(EX_UNAVAILABLE);
331
case ENAMETOOLONG:
332
case E2BIG:
333
case ENOMEM:
334
case EFAULT:
335
case EIO:
336
case EMFILE:
337
case ENFILE:
338
case ETXTBSY:
339
default:
340
_exit(EX_OSERR);
341
case ENOTDIR:
342
case ELOOP:
343
case EISDIR:
344
#ifdef ELIBBAD
345
case ELIBBAD: /* Linux only */
346
#endif
347
case EPERM:
348
_exit(EX_OSFILE);
232
ret = execl(splashy_command, splashy_command, prompt,
233
(char *)NULL);
234
if(not interrupted_by_signal){
235
perror("execl");
349
236
}
237
free(prompt);
238
_exit(EXIT_FAILURE);
350
239
}
351
free(prompt);
352
_exit(EXIT_FAILURE);
353
240
}
354
241
355
242
/* Parent */
356
243
free(prompt);
357
prompt = NULL;
358
359
if(interrupted_by_signal){
360
goto failure;
361
}
362
244
363
245
/* Wait for command to complete */
364
{
246
if(not interrupted_by_signal and splashy_command_pid != 0){
365
247
int status;
366
do {
367
ret = waitpid(splashy_command_pid, &status, 0);
368
} while(ret == -1 and errno == EINTR
369
and not interrupted_by_signal);
370
if(interrupted_by_signal){
371
goto failure;
372
}
248
ret = waitpid(splashy_command_pid, &status, 0);
373
249
if(ret == -1){
374
error_plus(0, errno, "waitpid");
250
if(errno != EINTR){
251
perror("waitpid");
252
}
375
253
if(errno == ECHILD){
376
254
splashy_command_pid = 0;
377
255
}
378
256
} else {
379
257
/* The child process has exited */
380
258
splashy_command_pid = 0;
381
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
259
if(not interrupted_by_signal and WIFEXITED(status)
260
and WEXITSTATUS(status)==0){
382
261
return EXIT_SUCCESS;
383
262
}
384
263
}
385
264
}
386
387
failure:
388
389
free(prompt);
390
391
if(proc_dir != NULL){
392
TEMP_FAILURE_RETRY(closedir(proc_dir));
393
}
394
395
if(splashy_command_pid != 0){
396
TEMP_FAILURE_RETRY(kill(splashy_command_pid, SIGTERM));
397
398
TEMP_FAILURE_RETRY(kill(splashy_pid, SIGTERM));
399
sleep(2);
400
while(TEMP_FAILURE_RETRY(kill(splashy_pid, 0)) == 0){
401
TEMP_FAILURE_RETRY(kill(splashy_pid, SIGKILL));
402
sleep(1);
403
}
404
pid_t new_splashy_pid = (pid_t)TEMP_FAILURE_RETRY(fork());
405
if(new_splashy_pid == 0){
406
/* Child; will become new splashy process */
407
408
/* Make the effective user ID (root) the only user ID instead of
409
the real user ID (_mandos) */
410
ret = setuid(geteuid());
411
if(ret == -1){
412
error_plus(0, errno, "setuid");
413
}
414
415
setsid();
416
ret = chdir("/");
417
if(ret == -1){
418
error_plus(0, errno, "chdir");
419
}
420
/* if(fork() != 0){ */
421
/* _exit(EXIT_SUCCESS); */
422
/* } */
423
ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace stdout */
424
if(ret == -1){
425
error_plus(0, errno, "dup2");
426
_exit(EX_OSERR);
427
}
428
429
execl("/sbin/splashy", "/sbin/splashy", "boot", (char *)NULL);
430
{
431
int e = errno;
432
error_plus(0, errno, "execl");
433
switch(e){
434
case EACCES:
435
case ENOENT:
436
case ENOEXEC:
437
default:
438
_exit(EX_UNAVAILABLE);
439
case ENAMETOOLONG:
440
case E2BIG:
441
case ENOMEM:
442
_exit(EX_OSERR);
443
case ENOTDIR:
444
case ELOOP:
445
_exit(EX_OSFILE);
446
}
447
}
448
}
449
}
450
451
if(interrupted_by_signal){
452
struct sigaction signal_action;
453
sigemptyset(&signal_action.sa_mask);
454
signal_action.sa_handler = SIG_DFL;
455
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
456
&signal_action, NULL));
457
if(ret == -1){
458
error_plus(0, errno, "sigaction");
459
}
460
do {
461
ret = raise(signal_received);
462
} while(ret != 0 and errno == EINTR);
463
if(ret != 0){
464
error_plus(0, errno, "raise");
465
abort();
466
}
467
TEMP_FAILURE_RETRY(pause());
468
}
469
470
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;
471
304
}
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Version: 2.0.2.dev0