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- Committer: Björn Påhlsson
- Date: 2008-09-03 19:04:05 UTC
- mfrom: (148 mandos)
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 149.
- Revision ID: belorn@braxen-20080903190405-4uuej92nf0qnmcrc
merge
- files added:
- plugins.d/usplash
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- .bzrignore
added
removed
plugins.d/usplash.c
1
#define _GNU_SOURCE /* asprintf() */
2
#include <signal.h> /* sig_atomic_t, struct sigaction,
3
sigemptyset(), sigaddset(),
4
sigaction, SIGINT, SIG_IGN, SIGHUP,
5
SIGTERM, kill(), SIGKILL */
6
#include <stddef.h> /* NULL */
7
#include <stdlib.h> /* getenv() */
8
#include <stdio.h> /* asprintf(), perror() */
9
#include <stdlib.h> /* EXIT_FAILURE, EXIT_SUCCESS,
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strtoul(), free() */
11
#include <sys/types.h> /* pid_t, DIR, struct dirent,
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ssize_t */
13
#include <dirent.h> /* opendir(), readdir(), closedir() */
14
#include <unistd.h> /* readlink(), fork(), execl(),
15
_exit */
16
#include <string.h> /* memcmp() */
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#include <iso646.h> /* and */
18
#include <stdbool.h> /* bool, false, true */
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#include <errno.h> /* errno */
20
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
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WEXITSTATUS() */
22
#include <fcntl.h> /* open(), O_RDONLY */
23
24
sig_atomic_t interrupted_by_signal = 0;
25
26
static void termination_handler(__attribute__((unused))int signum){
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interrupted_by_signal = 1;
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}
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30
int main(__attribute__((unused))int argc,
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__attribute__((unused))char **argv){
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int ret = 0;
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ssize_t sret;
34
bool an_error_occured = false;
35
36
/* Create prompt string */
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char *prompt = NULL;
38
{
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const char *const cryptsource = getenv("cryptsource");
40
const char *const crypttarget = getenv("crypttarget");
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const char *const prompt_start = "Enter passphrase to unlock the disk";
42
43
if(cryptsource == NULL){
44
if(crypttarget == NULL){
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ret = asprintf(&prompt, "%s: ", prompt_start);
46
} else {
47
ret = asprintf(&prompt, "%s (%s): ", prompt_start,
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crypttarget);
49
}
50
} else {
51
if(crypttarget == NULL){
52
ret = asprintf(&prompt, "%s %s: ", prompt_start, cryptsource);
53
} else {
54
ret = asprintf(&prompt, "%s %s (%s): ", prompt_start,
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cryptsource, crypttarget);
56
}
57
}
58
if(ret == -1){
59
return EXIT_FAILURE;
60
}
61
}
62
63
/* Find usplash process */
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pid_t usplash_pid = 0;
65
char *cmdline = NULL;
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size_t cmdline_len = 0;
67
{
68
const char usplash_name[] = "/sbin/usplash";
69
DIR *proc_dir = opendir("/proc");
70
if(proc_dir == NULL){
71
free(prompt);
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perror("opendir");
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return EXIT_FAILURE;
74
}
75
for(struct dirent *proc_ent = readdir(proc_dir);
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proc_ent != NULL;
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proc_ent = readdir(proc_dir)){
78
pid_t pid = (pid_t) strtoul(proc_ent->d_name, NULL, 10);
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if(pid == 0){
80
/* Not a process */
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continue;
82
}
83
/* Find the executable name by doing readlink() on the
84
/proc/<pid>/exe link */
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char exe_target[sizeof(usplash_name)];
86
{
87
char *exe_link;
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ret = asprintf(&exe_link, "/proc/%s/exe", proc_ent->d_name);
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if(ret == -1){
90
perror("asprintf");
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free(prompt);
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closedir(proc_dir);
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return EXIT_FAILURE;
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}
95
sret = readlink(exe_link, exe_target, sizeof(exe_target));
96
free(exe_link);
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}
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if((sret == ((ssize_t)sizeof(exe_target)-1))
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and (memcmp(usplash_name, exe_target,
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sizeof(exe_target)-1) == 0)){
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usplash_pid = pid;
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/* Read and save the command line of usplash in "cmdline" */
103
{
104
/* Open /proc/<pid>/cmdline */
105
int cl_fd;
106
{
107
char *cmdline_filename;
108
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
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proc_ent->d_name);
110
if(ret == -1){
111
perror("asprintf");
112
free(prompt);
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closedir(proc_dir);
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return EXIT_FAILURE;
115
}
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cl_fd = open(cmdline_filename, O_RDONLY);
117
if(cl_fd == -1){
118
perror("open");
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free(cmdline_filename);
120
free(prompt);
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closedir(proc_dir);
122
return EXIT_FAILURE;
123
}
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free(cmdline_filename);
125
}
126
size_t cmdline_allocated = 0;
127
char *tmp;
128
const size_t blocksize = 1024;
129
do{
130
if(cmdline_len + blocksize > cmdline_allocated){
131
tmp = realloc(cmdline, cmdline_allocated + blocksize);
132
if(tmp == NULL){
133
perror("realloc");
134
free(cmdline);
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free(prompt);
136
closedir(proc_dir);
137
return EXIT_FAILURE;
138
}
139
cmdline = tmp;
140
cmdline_allocated += blocksize;
141
}
142
sret = read(cl_fd, cmdline + cmdline_len,
143
cmdline_allocated - cmdline_len);
144
if(sret == -1){
145
perror("read");
146
free(cmdline);
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free(prompt);
148
closedir(proc_dir);
149
return EXIT_FAILURE;
150
}
151
cmdline_len += (size_t)sret;
152
} while(sret != 0);
153
close(cl_fd);
154
}
155
break;
156
}
157
}
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closedir(proc_dir);
159
}
160
if(usplash_pid == 0){
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free(prompt);
162
return EXIT_FAILURE;
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}
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165
/* Set up the signal handler */
166
{
167
struct sigaction old_action,
168
new_action = { .sa_handler = termination_handler,
169
.sa_flags = 0 };
170
sigemptyset(&new_action.sa_mask);
171
sigaddset(&new_action.sa_mask, SIGINT);
172
sigaddset(&new_action.sa_mask, SIGHUP);
173
sigaddset(&new_action.sa_mask, SIGTERM);
174
ret = sigaction(SIGINT, NULL, &old_action);
175
if(ret == -1){
176
perror("sigaction");
177
free(prompt);
178
return EXIT_FAILURE;
179
}
180
if (old_action.sa_handler != SIG_IGN){
181
ret = sigaction(SIGINT, &new_action, NULL);
182
if(ret == -1){
183
perror("sigaction");
184
free(prompt);
185
return EXIT_FAILURE;
186
}
187
}
188
ret = sigaction(SIGHUP, NULL, &old_action);
189
if(ret == -1){
190
perror("sigaction");
191
free(prompt);
192
return EXIT_FAILURE;
193
}
194
if (old_action.sa_handler != SIG_IGN){
195
ret = sigaction(SIGHUP, &new_action, NULL);
196
if(ret == -1){
197
perror("sigaction");
198
free(prompt);
199
return EXIT_FAILURE;
200
}
201
}
202
ret = sigaction(SIGTERM, NULL, &old_action);
203
if(ret == -1){
204
perror("sigaction");
205
free(prompt);
206
return EXIT_FAILURE;
207
}
208
if (old_action.sa_handler != SIG_IGN){
209
ret = sigaction(SIGTERM, &new_action, NULL);
210
if(ret == -1){
211
perror("sigaction");
212
free(prompt);
213
return EXIT_FAILURE;
214
}
215
}
216
}
217
218
/* Write command to FIFO */
219
if(not interrupted_by_signal){
220
int fifo_fd = open("/dev/.initramfs/usplash_fifo", O_WRONLY);
221
if(fifo_fd == -1){
222
perror("open");
223
free(prompt);
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return EXIT_FAILURE;
225
}
226
char *command;
227
ret = asprintf(&command, "INPUTQUIET %s", prompt);
228
if(ret == -1){
229
perror("asprintf");
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free(prompt);
231
return EXIT_FAILURE;
232
}
233
free(prompt);
234
235
size_t command_len = (size_t)ret + 1;
236
size_t written = 0;
237
while(not interrupted_by_signal and written < command_len){
238
ret = write(fifo_fd, command + written, command_len - written);
239
if(ret == -1){
240
if(interrupted_by_signal){
241
break;
242
}
243
perror("write");
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if(written == 0){
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free(command);
246
return EXIT_FAILURE;
247
}
248
an_error_occured = true;
249
break;
250
}
251
written += (size_t)ret;
252
}
253
ret = close(fifo_fd);
254
if(ret == -1 and not interrupted_by_signal){
255
an_error_occured = true;
256
}
257
free(command);
258
}else{
259
free(prompt);
260
}
261
262
{
263
char *buf = NULL;
264
size_t buf_len = 0;
265
266
/* Read from FIFO */
267
if(not interrupted_by_signal and not an_error_occured){
268
int fifo_fd = open("/dev/.initramfs/usplash_outfifo", O_RDONLY);
269
if(fifo_fd == -1 and not interrupted_by_signal){
270
perror("open");
271
return EXIT_FAILURE;
272
}
273
size_t buf_allocated = 0;
274
const int blocksize = 1024;
275
do{
276
if(buf_len + blocksize > buf_allocated){
277
char *tmp = realloc(buf, buf_allocated + blocksize);
278
if(tmp == NULL){
279
perror("realloc");
280
an_error_occured = true;
281
break;
282
}
283
buf = tmp;
284
buf_allocated += blocksize;
285
}
286
sret = read(fifo_fd, buf + buf_len, buf_allocated - buf_len);
287
if(sret == -1){
288
perror("read");
289
an_error_occured = true;
290
break;
291
}
292
buf_len += (size_t)sret;
293
}while(not interrupted_by_signal and sret != 0);
294
close(fifo_fd);
295
}
296
297
/* Print password to stdout */
298
if(not interrupted_by_signal and not an_error_occured){
299
size_t written = 0;
300
do{
301
sret = write(STDOUT_FILENO, buf + written, buf_len - written);
302
if(sret == -1 and not interrupted_by_signal){
303
perror("write");
304
an_error_occured = true;
305
break;
306
}
307
written += (size_t)sret;
308
}while(written < buf_len);
309
if(not interrupted_by_signal and not an_error_occured){
310
return EXIT_SUCCESS;
311
}
312
}
313
}
314
315
kill(usplash_pid, SIGTERM);
316
317
int cmdline_argc = 0;
318
char **cmdline_argv = malloc(sizeof(char *));
319
/* Create argv and argc for new usplash*/
320
{
321
ptrdiff_t position = 0;
322
while((size_t)position < cmdline_len){
323
char **tmp = realloc(cmdline_argv,
324
(sizeof(char *) * (size_t)(cmdline_argc + 2)));
325
if(tmp == NULL){
326
perror("realloc");
327
free(cmdline_argv);
328
return EXIT_FAILURE;
329
}
330
cmdline_argv = tmp;
331
cmdline_argv[cmdline_argc] = cmdline + position;
332
cmdline_argc++;
333
position = (char *)rawmemchr(cmdline + position, '\0')
334
- cmdline + 1;
335
}
336
cmdline_argv[cmdline_argc] = NULL;
337
}
338
pid_t new_usplash_pid = fork();
339
if(new_usplash_pid == 0){
340
/* Child; will become new usplash process */
341
while(kill(usplash_pid, 0)){
342
sleep(2);
343
kill(usplash_pid, SIGKILL);
344
sleep(1);
345
}
346
ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
347
if(ret == -1){
348
perror("dup2");
349
_exit(EXIT_FAILURE);
350
}
351
execv("/sbin/usplash", cmdline_argv);
352
}
353
354
return EXIT_FAILURE;
355
}
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