To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/splashy.c
- browse files at revision 240
- compare with another revision
- download diff
- download tarball
- view history from revision 240
- Committer: Teddy Hogeborn
- Date: 2008-12-21 19:19:25 UTC
- mfrom: (24.1.116 mandos)
- Revision ID: teddy@fukt.bsnet.se-20081221191925-iw4js3mr8e04p35r
Merge "mandos-list" from belorn.
* Makefile (PROGS): Added "mandos-list".
(mandos-list): New.
* mandos-list: New; from merge. Added unicode support.
* Makefile (PROGS): Added "mandos-list".
(mandos-list): New.
* mandos-list: New; from merge. Added unicode support.
- files added:
- debian/mandos-client.config
- files removed:
- debian/watch
- files renamed:
- mandos-ctl => mandos-list
- files modified:
- INSTALL
added
removed
plugins.d/splashy.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Splashy - Read a password from splashy and output it
3
* Passprompt - 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 Teddy Hogeborn
6
* Copyright © 2008 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@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
45
#include <errno.h> /* errno */
47
46
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
48
47
WEXITSTATUS() */
49
48
50
49
sig_atomic_t interrupted_by_signal = 0;
51
int signal_received;
52
50
53
static void termination_handler(int signum){
54
if(interrupted_by_signal){
55
return;
56
}
51
static void termination_handler(__attribute__((unused))int signum){
57
52
interrupted_by_signal = 1;
58
signal_received = signum;
59
53
}
60
54
61
55
int main(__attribute__((unused))int argc,
62
56
__attribute__((unused))char **argv){
63
57
int ret = 0;
58
59
/* Create prompt string */
64
60
char *prompt = NULL;
65
DIR *proc_dir = NULL;
66
pid_t splashy_pid = 0;
67
pid_t splashy_command_pid = 0;
68
69
/* Create prompt string */
70
61
{
71
62
const char *const cryptsource = getenv("cryptsource");
72
63
const char *const crypttarget = getenv("crypttarget");
89
80
}
90
81
}
91
82
if(ret == -1){
92
prompt = NULL;
93
goto failure;
83
return EXIT_FAILURE;
94
84
}
95
85
}
96
86
97
87
/* Find splashy process */
88
pid_t splashy_pid = 0;
98
89
{
99
90
const char splashy_name[] = "/sbin/splashy";
100
proc_dir = opendir("/proc");
91
DIR *proc_dir = opendir("/proc");
101
92
if(proc_dir == NULL){
93
free(prompt);
102
94
perror("opendir");
103
goto failure;
95
return EXIT_FAILURE;
104
96
}
105
97
for(struct dirent *proc_ent = readdir(proc_dir);
106
98
proc_ent != NULL;
107
99
proc_ent = readdir(proc_dir)){
108
pid_t pid;
109
{
110
intmax_t tmpmax;
111
char *tmp;
112
errno = 0;
113
tmpmax = strtoimax(proc_ent->d_name, &tmp, 10);
114
if(errno != 0 or tmp == proc_ent->d_name or *tmp != '\0'
115
or tmpmax != (pid_t)tmpmax){
116
/* Not a process */
117
continue;
118
}
119
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;
120
104
}
121
105
/* Find the executable name by doing readlink() on the
122
106
/proc/<pid>/exe link */
127
111
ret = asprintf(&exe_link, "/proc/%s/exe", proc_ent->d_name);
128
112
if(ret == -1){
129
113
perror("asprintf");
130
goto failure;
114
free(prompt);
115
closedir(proc_dir);
116
return EXIT_FAILURE;
131
117
}
132
118
133
119
/* Check that it refers to a symlink owned by root:root */
134
120
struct stat exe_stat;
135
121
ret = lstat(exe_link, &exe_stat);
136
122
if(ret == -1){
137
if(errno == ENOENT){
138
free(exe_link);
139
continue;
140
}
141
123
perror("lstat");
142
124
free(exe_link);
143
goto failure;
125
free(prompt);
126
closedir(proc_dir);
127
return EXIT_FAILURE;
144
128
}
145
129
if(not S_ISLNK(exe_stat.st_mode)
146
130
or exe_stat.st_uid != 0
160
144
}
161
145
}
162
146
closedir(proc_dir);
163
proc_dir = NULL;
164
147
}
165
148
if(splashy_pid == 0){
166
goto failure;
149
free(prompt);
150
return EXIT_FAILURE;
167
151
}
168
152
169
153
/* Set up the signal handler */
172
156
new_action = { .sa_handler = termination_handler,
173
157
.sa_flags = 0 };
174
158
sigemptyset(&new_action.sa_mask);
175
ret = sigaddset(&new_action.sa_mask, SIGINT);
176
if(ret == -1){
177
perror("sigaddset");
178
goto failure;
179
}
180
ret = sigaddset(&new_action.sa_mask, SIGHUP);
181
if(ret == -1){
182
perror("sigaddset");
183
goto failure;
184
}
185
ret = sigaddset(&new_action.sa_mask, SIGTERM);
186
if(ret == -1){
187
perror("sigaddset");
188
goto failure;
189
}
159
sigaddset(&new_action.sa_mask, SIGINT);
160
sigaddset(&new_action.sa_mask, SIGHUP);
161
sigaddset(&new_action.sa_mask, SIGTERM);
190
162
ret = sigaction(SIGINT, NULL, &old_action);
191
163
if(ret == -1){
192
164
perror("sigaction");
193
goto failure;
165
free(prompt);
166
return EXIT_FAILURE;
194
167
}
195
168
if(old_action.sa_handler != SIG_IGN){
196
169
ret = sigaction(SIGINT, &new_action, NULL);
197
170
if(ret == -1){
198
171
perror("sigaction");
199
goto failure;
172
free(prompt);
173
return EXIT_FAILURE;
200
174
}
201
175
}
202
176
ret = sigaction(SIGHUP, NULL, &old_action);
203
177
if(ret == -1){
204
178
perror("sigaction");
205
goto failure;
179
free(prompt);
180
return EXIT_FAILURE;
206
181
}
207
182
if(old_action.sa_handler != SIG_IGN){
208
183
ret = sigaction(SIGHUP, &new_action, NULL);
209
184
if(ret == -1){
210
185
perror("sigaction");
211
goto failure;
186
free(prompt);
187
return EXIT_FAILURE;
212
188
}
213
189
}
214
190
ret = sigaction(SIGTERM, NULL, &old_action);
215
191
if(ret == -1){
216
192
perror("sigaction");
217
goto failure;
193
free(prompt);
194
return EXIT_FAILURE;
218
195
}
219
196
if(old_action.sa_handler != SIG_IGN){
220
197
ret = sigaction(SIGTERM, &new_action, NULL);
221
198
if(ret == -1){
222
199
perror("sigaction");
223
goto failure;
200
free(prompt);
201
return EXIT_FAILURE;
224
202
}
225
203
}
226
204
}
227
205
228
if(interrupted_by_signal){
229
goto failure;
230
}
231
232
206
/* Fork off the splashy command to prompt for password */
233
splashy_command_pid = fork();
234
if(splashy_command_pid != 0 and interrupted_by_signal){
235
goto failure;
236
}
237
if(splashy_command_pid == -1){
238
perror("fork");
239
goto failure;
240
}
241
/* Child */
242
if(splashy_command_pid == 0){
243
if(not interrupted_by_signal){
207
pid_t splashy_command_pid = 0;
208
if(not interrupted_by_signal){
209
splashy_command_pid = fork();
210
if(splashy_command_pid == -1){
211
if(not interrupted_by_signal){
212
perror("fork");
213
}
214
return EXIT_FAILURE;
215
}
216
/* Child */
217
if(splashy_command_pid == 0){
244
218
const char splashy_command[] = "/sbin/splashy_update";
245
execl(splashy_command, splashy_command, prompt, (char *)NULL);
246
perror("execl");
219
ret = execl(splashy_command, splashy_command, prompt,
220
(char *)NULL);
221
if(not interrupted_by_signal){
222
perror("execl");
223
}
224
free(prompt);
225
_exit(EXIT_FAILURE);
247
226
}
248
free(prompt);
249
_exit(EXIT_FAILURE);
250
227
}
251
228
252
229
/* Parent */
253
230
free(prompt);
254
prompt = NULL;
255
256
if(interrupted_by_signal){
257
goto failure;
258
}
259
231
260
232
/* Wait for command to complete */
261
{
233
if(not interrupted_by_signal and splashy_command_pid != 0){
262
234
int status;
263
do {
264
ret = waitpid(splashy_command_pid, &status, 0);
265
} while(ret == -1 and errno == EINTR
266
and not interrupted_by_signal);
267
if(interrupted_by_signal){
268
goto failure;
269
}
235
ret = waitpid(splashy_command_pid, &status, 0);
270
236
if(ret == -1){
271
perror("waitpid");
237
if(errno != EINTR){
238
perror("waitpid");
239
}
272
240
if(errno == ECHILD){
273
241
splashy_command_pid = 0;
274
242
}
275
243
} else {
276
244
/* The child process has exited */
277
245
splashy_command_pid = 0;
278
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
246
if(not interrupted_by_signal and WIFEXITED(status)
247
and WEXITSTATUS(status)==0){
279
248
return EXIT_SUCCESS;
280
249
}
281
250
}
282
251
}
283
284
failure:
285
286
free(prompt);
287
288
if(proc_dir != NULL){
289
TEMP_FAILURE_RETRY(closedir(proc_dir));
290
}
291
292
if(splashy_command_pid != 0){
293
TEMP_FAILURE_RETRY(kill(splashy_command_pid, SIGTERM));
294
295
TEMP_FAILURE_RETRY(kill(splashy_pid, SIGTERM));
296
sleep(2);
297
while(TEMP_FAILURE_RETRY(kill(splashy_pid, 0)) == 0){
298
TEMP_FAILURE_RETRY(kill(splashy_pid, SIGKILL));
299
sleep(1);
300
}
301
pid_t new_splashy_pid = (pid_t)TEMP_FAILURE_RETRY(fork());
302
if(new_splashy_pid == 0){
303
/* Child; will become new splashy process */
304
305
/* Make the effective user ID (root) the only user ID instead of
306
the real user ID (_mandos) */
307
ret = setuid(geteuid());
308
if(ret == -1){
309
perror("setuid");
310
}
311
312
setsid();
313
ret = chdir("/");
314
if(ret == -1){
315
perror("chdir");
316
}
317
/* if(fork() != 0){ */
318
/* _exit(EXIT_SUCCESS); */
319
/* } */
320
ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace stdout */
321
if(ret == -1){
322
perror("dup2");
323
_exit(EXIT_FAILURE);
324
}
325
326
execl("/sbin/splashy", "/sbin/splashy", "boot", (char *)NULL);
252
kill(splashy_pid, SIGTERM);
253
if(interrupted_by_signal and splashy_command_pid != 0){
254
kill(splashy_command_pid, SIGTERM);
255
}
256
sleep(2);
257
while(kill(splashy_pid, 0) == 0){
258
kill(splashy_pid, SIGKILL);
259
sleep(1);
260
}
261
pid_t new_splashy_pid = fork();
262
if(new_splashy_pid == 0){
263
/* Child; will become new splashy process */
264
265
/* Make the effective user ID (root) the only user ID instead of
266
the real user ID (mandos) */
267
ret = setuid(geteuid());
268
if(ret == -1){
269
perror("setuid");
270
}
271
272
setsid();
273
ret = chdir("/");
274
/* if(fork() != 0){ */
275
/* _exit(EXIT_SUCCESS); */
276
/* } */
277
ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
278
if(ret == -1){
279
perror("dup2");
280
_exit(EXIT_FAILURE);
281
}
282
283
execl("/sbin/splashy", "/sbin/splashy", "boot", (char *)NULL);
284
if(not interrupted_by_signal){
327
285
perror("execl");
328
_exit(EXIT_FAILURE);
329
}
330
}
331
332
if(interrupted_by_signal){
333
struct sigaction signal_action;
334
sigemptyset(&signal_action.sa_mask);
335
signal_action.sa_handler = SIG_DFL;
336
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
337
&signal_action, NULL));
338
if(ret == -1){
339
perror("sigaction");
340
}
341
do {
342
ret = raise(signal_received);
343
} while(ret != 0 and errno == EINTR);
344
if(ret != 0){
345
perror("raise");
346
abort();
347
}
348
TEMP_FAILURE_RETRY(pause());
286
}
287
_exit(EXIT_FAILURE);
349
288
}
350
289
351
290
return EXIT_FAILURE;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0