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- Committer: Teddy Hogeborn
- Date: 2008-09-26 19:47:21 UTC
- Revision ID: teddy@fukt.bsnet.se-20080926194721-r8pm2p876hcf9xay
* Makefile (PLUGINS): Added "plugins.d/askpass-fifo".
(install-client-nokey): - '' -
* debian/mandos-client.lintian-overrides: Added "plugins.d/askpass-fifo".
* plugins.d/askpass-fifo.c: New.
(install-client-nokey): - '' -
* debian/mandos-client.lintian-overrides: Added "plugins.d/askpass-fifo".
* plugins.d/askpass-fifo.c: New.
- files added:
- debian/mandos-client.config
- files removed:
- NEWS
- files modified:
- .bzrignore
added
removed
plugins.d/splashy.c
1
/* -*- coding: utf-8 -*- */
2
/*
3
* Splashy - Read a password from splashy and output it
4
*
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
7
*
8
* This program is free software: you can redistribute it and/or
9
* modify it under the terms of the GNU General Public License as
10
* published by the Free Software Foundation, either version 3 of the
11
* License, or (at your option) any later version.
12
*
13
* This program is distributed in the hope that it will be useful, but
14
* WITHOUT ANY WARRANTY; without even the implied warranty of
15
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16
* General Public License for more details.
17
*
18
* You should have received a copy of the GNU General Public License
19
* along with this program. If not, see
20
* <http://www.gnu.org/licenses/>.
21
*
22
* Contact the authors at <mandos@fukt.bsnet.se>.
23
*/
24
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
1
#define _GNU_SOURCE /* asprintf() */
26
2
#include <signal.h> /* sig_atomic_t, struct sigaction,
27
sigemptyset(), sigaddset(), SIGINT,
28
SIGHUP, SIGTERM, sigaction,
29
SIG_IGN, kill(), SIGKILL */
3
sigemptyset(), sigaddset(),
4
sigaction, SIGINT, SIG_IGN, SIGHUP,
5
SIGTERM, kill(), SIGKILL */
30
6
#include <stddef.h> /* NULL */
31
7
#include <stdlib.h> /* getenv() */
32
8
#include <stdio.h> /* asprintf(), perror() */
33
#include <stdlib.h> /* EXIT_FAILURE, free(),
34
EXIT_SUCCESS */
9
#include <stdlib.h> /* EXIT_FAILURE, EXIT_SUCCESS,
10
strtoul(), free() */
35
11
#include <sys/types.h> /* pid_t, DIR, struct dirent,
36
12
ssize_t */
37
13
#include <dirent.h> /* opendir(), readdir(), closedir() */
38
#include <inttypes.h> /* intmax_t, strtoimax() */
39
#include <sys/stat.h> /* struct stat, lstat(), S_ISLNK */
40
#include <iso646.h> /* not, or, and */
41
14
#include <unistd.h> /* readlink(), fork(), execl(),
42
sleep(), dup2() STDERR_FILENO,
43
STDOUT_FILENO, _exit(),
44
pause() */
15
_exit */
45
16
#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 */
17
#include <iso646.h> /* and */
18
#include <errno.h> /* errno */
52
19
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
53
20
WEXITSTATUS() */
54
#include <sysexits.h> /* EX_OSERR, EX_OSFILE,
55
EX_UNAVAILABLE */
56
21
57
22
sig_atomic_t interrupted_by_signal = 0;
58
int signal_received;
59
23
60
static void termination_handler(int signum){
61
if(interrupted_by_signal){
62
return;
63
}
24
static void termination_handler(__attribute__((unused))int signum){
64
25
interrupted_by_signal = 1;
65
signal_received = signum;
66
26
}
67
27
68
28
int main(__attribute__((unused))int argc,
69
29
__attribute__((unused))char **argv){
70
30
int ret = 0;
31
32
/* Create prompt string */
71
33
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
34
{
79
35
const char *const cryptsource = getenv("cryptsource");
80
36
const char *const crypttarget = getenv("crypttarget");
97
53
}
98
54
}
99
55
if(ret == -1){
100
prompt = NULL;
101
exitstatus = EX_OSERR;
102
goto failure;
56
return EXIT_FAILURE;
103
57
}
104
58
}
105
59
106
60
/* Find splashy process */
61
pid_t splashy_pid = 0;
107
62
{
108
63
const char splashy_name[] = "/sbin/splashy";
109
proc_dir = opendir("/proc");
64
DIR *proc_dir = opendir("/proc");
110
65
if(proc_dir == NULL){
111
int e = errno;
66
free(prompt);
112
67
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;
68
return EXIT_FAILURE;
129
69
}
130
70
for(struct dirent *proc_ent = readdir(proc_dir);
131
71
proc_ent != NULL;
132
72
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;
73
pid_t pid = (pid_t) strtoul(proc_ent->d_name, NULL, 10);
74
if(pid == 0){
75
/* Not a process */
76
continue;
145
77
}
146
78
/* Find the executable name by doing readlink() on the
147
79
/proc/<pid>/exe link */
152
84
ret = asprintf(&exe_link, "/proc/%s/exe", proc_ent->d_name);
153
85
if(ret == -1){
154
86
perror("asprintf");
155
exitstatus = EX_OSERR;
156
goto failure;
157
}
158
159
/* Check that it refers to a symlink owned by root:root */
160
struct stat exe_stat;
161
ret = lstat(exe_link, &exe_stat);
162
if(ret == -1){
163
if(errno == ENOENT){
164
free(exe_link);
165
continue;
166
}
167
int e = errno;
168
perror("lstat");
169
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;
182
}
183
if(not S_ISLNK(exe_stat.st_mode)
184
or exe_stat.st_uid != 0
185
or exe_stat.st_gid != 0){
186
free(exe_link);
187
continue;
188
}
189
87
free(prompt);
88
closedir(proc_dir);
89
return EXIT_FAILURE;
90
}
190
91
sret = readlink(exe_link, exe_target, sizeof(exe_target));
191
92
free(exe_link);
192
93
}
198
99
}
199
100
}
200
101
closedir(proc_dir);
201
proc_dir = NULL;
202
102
}
203
103
if(splashy_pid == 0){
204
exitstatus = EX_UNAVAILABLE;
205
goto failure;
104
free(prompt);
105
return EXIT_FAILURE;
206
106
}
207
107
208
108
/* Set up the signal handler */
211
111
new_action = { .sa_handler = termination_handler,
212
112
.sa_flags = 0 };
213
113
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
}
114
sigaddset(&new_action.sa_mask, SIGINT);
115
sigaddset(&new_action.sa_mask, SIGHUP);
116
sigaddset(&new_action.sa_mask, SIGTERM);
232
117
ret = sigaction(SIGINT, NULL, &old_action);
233
118
if(ret == -1){
234
119
perror("sigaction");
235
exitstatus = EX_OSERR;
236
goto failure;
120
free(prompt);
121
return EXIT_FAILURE;
237
122
}
238
if(old_action.sa_handler != SIG_IGN){
123
if (old_action.sa_handler != SIG_IGN){
239
124
ret = sigaction(SIGINT, &new_action, NULL);
240
125
if(ret == -1){
241
126
perror("sigaction");
242
exitstatus = EX_OSERR;
243
goto failure;
127
free(prompt);
128
return EXIT_FAILURE;
244
129
}
245
130
}
246
131
ret = sigaction(SIGHUP, NULL, &old_action);
247
132
if(ret == -1){
248
133
perror("sigaction");
249
exitstatus = EX_OSERR;
250
goto failure;
134
free(prompt);
135
return EXIT_FAILURE;
251
136
}
252
if(old_action.sa_handler != SIG_IGN){
137
if (old_action.sa_handler != SIG_IGN){
253
138
ret = sigaction(SIGHUP, &new_action, NULL);
254
139
if(ret == -1){
255
140
perror("sigaction");
256
exitstatus = EX_OSERR;
257
goto failure;
141
free(prompt);
142
return EXIT_FAILURE;
258
143
}
259
144
}
260
145
ret = sigaction(SIGTERM, NULL, &old_action);
261
146
if(ret == -1){
262
147
perror("sigaction");
263
exitstatus = EX_OSERR;
264
goto failure;
148
free(prompt);
149
return EXIT_FAILURE;
265
150
}
266
if(old_action.sa_handler != SIG_IGN){
151
if (old_action.sa_handler != SIG_IGN){
267
152
ret = sigaction(SIGTERM, &new_action, NULL);
268
153
if(ret == -1){
269
154
perror("sigaction");
270
exitstatus = EX_OSERR;
271
goto failure;
155
free(prompt);
156
return EXIT_FAILURE;
272
157
}
273
158
}
274
159
}
275
160
276
if(interrupted_by_signal){
277
goto failure;
278
}
279
280
161
/* 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){
162
pid_t splashy_command_pid = 0;
163
if(not interrupted_by_signal){
164
splashy_command_pid = fork();
165
if(splashy_command_pid == -1){
166
if(not interrupted_by_signal){
167
perror("fork");
168
}
169
return EXIT_FAILURE;
170
}
171
/* Child */
172
if(splashy_command_pid == 0){
293
173
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);
174
ret = execl(splashy_command, splashy_command, prompt,
175
(char *)NULL);
176
if(not interrupted_by_signal and errno != ENOENT){
177
/* Don't report "File not found", since splashy might not be
178
installed. */
179
perror("execl");
319
180
}
181
free(prompt);
182
return EXIT_FAILURE;
320
183
}
321
free(prompt);
322
_exit(EXIT_FAILURE);
323
184
}
324
185
325
186
/* Parent */
326
187
free(prompt);
327
prompt = NULL;
328
329
if(interrupted_by_signal){
330
goto failure;
331
}
332
188
333
189
/* Wait for command to complete */
334
{
335
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
}
343
if(ret == -1){
344
perror("waitpid");
345
if(errno == ECHILD){
346
splashy_command_pid = 0;
347
}
348
} else {
349
/* The child process has exited */
350
splashy_command_pid = 0;
351
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
352
return EXIT_SUCCESS;
353
}
354
}
355
}
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));
190
int status;
191
while(not interrupted_by_signal){
192
waitpid(splashy_command_pid, &status, 0);
193
if(not interrupted_by_signal
194
and WIFEXITED(status) and WEXITSTATUS(status)==0){
195
return EXIT_SUCCESS;
196
}
197
}
198
kill(splashy_pid, SIGTERM);
199
if(interrupted_by_signal){
200
kill(splashy_command_pid, SIGTERM);
201
}
202
203
pid_t new_splashy_pid = fork();
204
if(new_splashy_pid == 0){
205
/* Child; will become new splashy process */
206
while(kill(splashy_pid, 0)){
207
sleep(2);
208
kill(splashy_pid, SIGKILL);
372
209
sleep(1);
373
210
}
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));
211
ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
427
212
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());
213
perror("dup2");
214
_exit(EXIT_FAILURE);
215
}
216
execl("/sbin/splashy", "/sbin/splashy", "boot", (char *)NULL);
438
217
}
439
218
440
return exitstatus;
219
return EXIT_FAILURE;
441
220
}
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Version: 2.0.2.dev0