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- Committer: Björn Påhlsson
- Date: 2008-07-20 02:52:20 UTC
- Revision ID: belorn@braxen-20080720025220-r5u0388uy9iu23h6
Added following support:
Pluginbased client handler
rewritten Mandos client
Avahi instead of udp server discovery
openpgp encrypted key support
Passprompt stand alone application for direct console input
Added logging for Mandos server
Pluginbased client handler
rewritten Mandos client
Avahi instead of udp server discovery
openpgp encrypted key support
Passprompt stand alone application for direct console input
Added logging for Mandos server
- files added:
- ca.pem
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- files renamed:
- clients.conf => mandos-clients.conf
- plugin-runner.c => plugbasedclient.c
- plugins.d/mandos-client.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos => server.py
- files modified:
- Makefile
added
removed
plugins.d/plymouth.c
1
/* -*- coding: utf-8 -*- */
2
/*
3
* Plymouth - Read a password from Plymouth and output it
4
*
5
* Copyright © 2010-2011 Teddy Hogeborn
6
* Copyright © 2010-2011 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 /* asprintf(), TEMP_FAILURE_RETRY() */
26
#include <signal.h> /* sig_atomic_t, struct sigaction,
27
sigemptyset(), sigaddset(), SIGINT,
28
SIGHUP, SIGTERM, sigaction(),
29
kill(), SIG_IGN */
30
#include <stdbool.h> /* bool, false, true */
31
#include <fcntl.h> /* open(), O_RDONLY */
32
#include <iso646.h> /* and, or, not*/
33
#include <sys/types.h> /* size_t, ssize_t, pid_t, struct
34
dirent, waitpid() */
35
#include <sys/wait.h> /* waitpid() */
36
#include <stddef.h> /* NULL */
37
#include <string.h> /* strchr(), memcmp() */
38
#include <stdio.h> /* asprintf(), perror(), fopen(),
39
fscanf() */
40
#include <unistd.h> /* close(), readlink(), read(),
41
fork(), setsid(), chdir(), dup2(),
42
STDERR_FILENO, execv(), access() */
43
#include <stdlib.h> /* free(), EXIT_FAILURE, realloc(),
44
EXIT_SUCCESS, malloc(), _exit(),
45
getenv() */
46
#include <dirent.h> /* scandir(), alphasort() */
47
#include <inttypes.h> /* intmax_t, strtoumax(), SCNuMAX */
48
#include <sys/stat.h> /* struct stat, lstat() */
49
#include <sysexits.h> /* EX_OSERR, EX_UNAVAILABLE */
50
#include <error.h> /* error() */
51
#include <errno.h> /* TEMP_FAILURE_RETRY */
52
#include <argz.h> /* argz_count(), argz_extract() */
53
54
sig_atomic_t interrupted_by_signal = 0;
55
const char plymouth_pid[] = "/dev/.initramfs/plymouth.pid";
56
const char plymouth_path[] = "/bin/plymouth";
57
const char plymouthd_path[] = "/sbin/plymouthd";
58
const char *plymouthd_default_argv[] = {"/sbin/plymouthd",
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"--mode=boot",
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"--attach-to-session",
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"--pid-file="
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"/dev/.initramfs/"
63
"plymouth.pid",
64
NULL };
65
66
static void termination_handler(__attribute__((unused))int signum){
67
if(interrupted_by_signal){
68
return;
69
}
70
interrupted_by_signal = 1;
71
}
72
73
/* Create prompt string */
74
char *makeprompt(void){
75
int ret = 0;
76
char *prompt;
77
const char *const cryptsource = getenv("cryptsource");
78
const char *const crypttarget = getenv("crypttarget");
79
const char prompt_start[] = "Unlocking the disk";
80
const char prompt_end[] = "Enter passphrase";
81
82
if(cryptsource == NULL){
83
if(crypttarget == NULL){
84
ret = asprintf(&prompt, "%s\n%s", prompt_start, prompt_end);
85
} else {
86
ret = asprintf(&prompt, "%s (%s)\n%s", prompt_start,
87
crypttarget, prompt_end);
88
}
89
} else {
90
if(crypttarget == NULL){
91
ret = asprintf(&prompt, "%s %s\n%s", prompt_start, cryptsource,
92
prompt_end);
93
} else {
94
ret = asprintf(&prompt, "%s %s (%s)\n%s", prompt_start,
95
cryptsource, crypttarget, prompt_end);
96
}
97
}
98
if(ret == -1){
99
return NULL;
100
}
101
return prompt;
102
}
103
104
void kill_and_wait(pid_t pid){
105
TEMP_FAILURE_RETRY(kill(pid, SIGTERM));
106
TEMP_FAILURE_RETRY(waitpid(pid, NULL, 0));
107
}
108
109
bool become_a_daemon(void){
110
int ret = setuid(geteuid());
111
if(ret == -1){
112
error(0, errno, "setuid");
113
}
114
115
setsid();
116
ret = chdir("/");
117
if(ret == -1){
118
error(0, errno, "chdir");
119
return false;
120
}
121
ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
122
if(ret == -1){
123
error(0, errno, "dup2");
124
return false;
125
}
126
return true;
127
}
128
129
bool exec_and_wait(pid_t *pid_return, const char *path,
130
const char **argv, bool interruptable,
131
bool daemonize){
132
int status;
133
int ret;
134
pid_t pid;
135
pid = fork();
136
if(pid == -1){
137
error(0, errno, "fork");
138
return false;
139
}
140
if(pid == 0){
141
/* Child */
142
if(daemonize){
143
if(not become_a_daemon()){
144
_exit(EX_OSERR);
145
}
146
}
147
148
char **new_argv = NULL;
149
char **tmp;
150
int i = 0;
151
for (; argv[i]!=NULL; i++){
152
tmp = realloc(new_argv, sizeof(const char *) * ((size_t)i + 1));
153
if (tmp == NULL){
154
error(0, errno, "realloc");
155
free(new_argv);
156
_exit(EX_OSERR);
157
}
158
new_argv = tmp;
159
new_argv[i] = strdup(argv[i]);
160
}
161
new_argv[i] = NULL;
162
163
execv(path, (char *const *)new_argv);
164
error(0, errno, "execv");
165
_exit(EXIT_FAILURE);
166
}
167
if(pid_return != NULL){
168
*pid_return = pid;
169
}
170
do {
171
ret = waitpid(pid, &status, 0);
172
} while(ret == -1 and errno == EINTR
173
and ((not interrupted_by_signal)
174
or (not interruptable)));
175
if(interrupted_by_signal and interruptable){
176
return false;
177
}
178
if(ret == -1){
179
error(0, errno, "waitpid");
180
return false;
181
}
182
if(WIFEXITED(status) and (WEXITSTATUS(status) == 0)){
183
return true;
184
}
185
return false;
186
}
187
188
int is_plymouth(const struct dirent *proc_entry){
189
int ret;
190
{
191
uintmax_t maxvalue;
192
char *tmp;
193
errno = 0;
194
maxvalue = strtoumax(proc_entry->d_name, &tmp, 10);
195
196
if(errno != 0 or *tmp != '\0'
197
or maxvalue != (uintmax_t)((pid_t)maxvalue)){
198
return 0;
199
}
200
}
201
char exe_target[sizeof(plymouthd_path)];
202
char *exe_link;
203
ret = asprintf(&exe_link, "/proc/%s/exe", proc_entry->d_name);
204
if(ret == -1){
205
error(0, errno, "asprintf");
206
return 0;
207
}
208
209
struct stat exe_stat;
210
ret = lstat(exe_link, &exe_stat);
211
if(ret == -1){
212
free(exe_link);
213
if(errno != ENOENT){
214
error(0, errno, "lstat");
215
}
216
return 0;
217
}
218
219
if(not S_ISLNK(exe_stat.st_mode)
220
or exe_stat.st_uid != 0
221
or exe_stat.st_gid != 0){
222
free(exe_link);
223
return 0;
224
}
225
226
ssize_t sret = readlink(exe_link, exe_target, sizeof(exe_target));
227
free(exe_link);
228
if((sret != (ssize_t)sizeof(plymouthd_path)-1) or
229
(memcmp(plymouthd_path, exe_target,
230
sizeof(plymouthd_path)-1) != 0)){
231
return 0;
232
}
233
return 1;
234
}
235
236
pid_t get_pid(void){
237
int ret;
238
FILE *pidfile = fopen(plymouth_pid, "r");
239
uintmax_t maxvalue = 0;
240
if(pidfile != NULL){
241
ret = fscanf(pidfile, "%" SCNuMAX, &maxvalue);
242
if(ret != 1){
243
maxvalue = 0;
244
}
245
fclose(pidfile);
246
}
247
if(maxvalue == 0){
248
struct dirent **direntries;
249
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
250
if (ret == -1){
251
error(0, errno, "scandir");
252
}
253
if (ret > 0){
254
ret = sscanf(direntries[0]->d_name, "%" SCNuMAX, &maxvalue);
255
if (ret < 0){
256
error(0, errno, "sscanf");
257
}
258
}
259
}
260
pid_t pid;
261
pid = (pid_t)maxvalue;
262
if((uintmax_t)pid == maxvalue){
263
return pid;
264
}
265
266
return 0;
267
}
268
269
const char **getargv(pid_t pid){
270
int cl_fd;
271
char *cmdline_filename;
272
ssize_t sret;
273
int ret;
274
275
ret = asprintf(&cmdline_filename, "/proc/%" PRIuMAX "/cmdline",
276
(uintmax_t)pid);
277
if(ret == -1){
278
error(0, errno, "asprintf");
279
return NULL;
280
}
281
282
/* Open /proc/<pid>/cmdline */
283
cl_fd = open(cmdline_filename, O_RDONLY);
284
free(cmdline_filename);
285
if(cl_fd == -1){
286
error(0, errno, "open");
287
return NULL;
288
}
289
290
size_t cmdline_allocated = 0;
291
size_t cmdline_len = 0;
292
char *cmdline = NULL;
293
char *tmp;
294
const size_t blocksize = 1024;
295
do {
296
/* Allocate more space? */
297
if(cmdline_len + blocksize > cmdline_allocated){
298
tmp = realloc(cmdline, cmdline_allocated + blocksize);
299
if(tmp == NULL){
300
error(0, errno, "realloc");
301
free(cmdline);
302
close(cl_fd);
303
return NULL;
304
}
305
cmdline = tmp;
306
cmdline_allocated += blocksize;
307
}
308
309
/* Read data */
310
sret = read(cl_fd, cmdline + cmdline_len,
311
cmdline_allocated - cmdline_len);
312
if(sret == -1){
313
error(0, errno, "read");
314
free(cmdline);
315
close(cl_fd);
316
return NULL;
317
}
318
cmdline_len += (size_t)sret;
319
} while(sret != 0);
320
ret = close(cl_fd);
321
if(ret == -1){
322
error(0, errno, "close");
323
free(cmdline);
324
return NULL;
325
}
326
327
/* we got cmdline and cmdline_len, ignore rest... */
328
char **argv = malloc((argz_count(cmdline, cmdline_len) + 1)
329
* sizeof(char *)); /* Get number of args */
330
if(argv == NULL){
331
error(0, errno, "argv = malloc()");
332
free(cmdline);
333
return NULL;
334
}
335
argz_extract(cmdline, cmdline_len, argv); /* Create argv */
336
return (const char **)argv;
337
}
338
339
int main(__attribute__((unused))int argc,
340
__attribute__((unused))char **argv){
341
char *prompt;
342
char *prompt_arg;
343
pid_t plymouth_command_pid;
344
int ret;
345
bool bret;
346
347
/* test -x /bin/plymouth */
348
ret = access(plymouth_path, X_OK);
349
if(ret == -1){
350
/* Plymouth is probably not installed. Don't print an error
351
message, just exit. */
352
exit(EX_UNAVAILABLE);
353
}
354
355
{ /* Add signal handlers */
356
struct sigaction old_action,
357
new_action = { .sa_handler = termination_handler,
358
.sa_flags = 0 };
359
sigemptyset(&new_action.sa_mask);
360
for(int *sig = (int[]){ SIGINT, SIGHUP, SIGTERM, 0 };
361
*sig != 0; sig++){
362
ret = sigaddset(&new_action.sa_mask, *sig);
363
if(ret == -1){
364
error(EX_OSERR, errno, "sigaddset");
365
}
366
ret = sigaction(*sig, NULL, &old_action);
367
if(ret == -1){
368
error(EX_OSERR, errno, "sigaction");
369
}
370
if(old_action.sa_handler != SIG_IGN){
371
ret = sigaction(*sig, &new_action, NULL);
372
if(ret == -1){
373
error(EX_OSERR, errno, "sigaction");
374
}
375
}
376
}
377
}
378
379
/* plymouth --ping */
380
bret = exec_and_wait(&plymouth_command_pid, plymouth_path,
381
(const char *[])
382
{ plymouth_path, "--ping", NULL },
383
true, false);
384
if(not bret){
385
if(interrupted_by_signal){
386
kill_and_wait(plymouth_command_pid);
387
exit(EXIT_FAILURE);
388
}
389
/* Plymouth is probably not running. Don't print an error
390
message, just exit. */
391
exit(EX_UNAVAILABLE);
392
}
393
394
prompt = makeprompt();
395
ret = asprintf(&prompt_arg, "--prompt=%s", prompt);
396
free(prompt);
397
if(ret == -1){
398
error(EX_OSERR, errno, "asprintf");
399
}
400
401
/* plymouth ask-for-password --prompt="$prompt" */
402
bret = exec_and_wait(&plymouth_command_pid,
403
plymouth_path, (const char *[])
404
{ plymouth_path, "ask-for-password",
405
prompt_arg, NULL },
406
true, false);
407
free(prompt_arg);
408
if(bret){
409
exit(EXIT_SUCCESS);
410
}
411
if(not interrupted_by_signal){
412
/* exec_and_wait failed for some other reason */
413
exit(EXIT_FAILURE);
414
}
415
kill_and_wait(plymouth_command_pid);
416
417
const char **plymouthd_argv;
418
pid_t pid = get_pid();
419
if(pid == 0){
420
error(0, 0, "plymouthd pid not found");
421
plymouthd_argv = plymouthd_default_argv;
422
} else {
423
plymouthd_argv = getargv(pid);
424
}
425
426
bret = exec_and_wait(NULL, plymouth_path, (const char *[])
427
{ plymouth_path, "quit", NULL },
428
false, false);
429
if(not bret){
430
exit(EXIT_FAILURE);
431
}
432
bret = exec_and_wait(NULL, plymouthd_path, plymouthd_argv,
433
false, true);
434
if(not bret){
435
exit(EXIT_FAILURE);
436
}
437
exec_and_wait(NULL, plymouth_path, (const char *[])
438
{ plymouth_path, "show-splash", NULL },
439
false, false);
440
exit(EXIT_FAILURE);
441
}
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