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- Committer: Teddy Hogeborn
- Date: 2009-10-22 00:05:01 UTC
- Revision ID: teddy@fukt.bsnet.se-20091022000501-g792e99q5g1wkyet
Merge from release branch.
- files removed:
- DBUS-API
- debian/source
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/password-prompt.c
2
2
/*
3
3
* Password-prompt - Read a password from the terminal and print it
4
4
*
5
* Copyright © 2008-2012 Teddy Hogeborn
6
* Copyright © 2008-2012 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 <mandos@fukt.bsnet.se>.
23
23
*/
24
24
25
#define _GNU_SOURCE /* getline(), asprintf() */
25
#define _GNU_SOURCE /* getline() */
26
26
27
#include <termios.h> /* struct termios, tcsetattr(),
27
#include <termios.h> /* struct termios, tcsetattr(),
28
28
TCSAFLUSH, tcgetattr(), ECHO */
29
29
#include <unistd.h> /* struct termios, tcsetattr(),
30
30
STDIN_FILENO, TCSAFLUSH,
31
tcgetattr(), ECHO, readlink() */
31
tcgetattr(), ECHO */
32
32
#include <signal.h> /* sig_atomic_t, raise(), struct
33
33
sigaction, sigemptyset(),
34
34
sigaction(), sigaddset(), SIGINT,
35
35
SIGQUIT, SIGHUP, SIGTERM,
36
36
raise() */
37
37
#include <stddef.h> /* NULL, size_t, ssize_t */
38
#include <sys/types.h> /* ssize_t, struct dirent, pid_t,
39
ssize_t, open() */
38
#include <sys/types.h> /* ssize_t */
40
39
#include <stdlib.h> /* EXIT_SUCCESS, EXIT_FAILURE,
41
getenv(), free() */
42
#include <dirent.h> /* scandir(), alphasort() */
40
getopt_long, getenv() */
43
41
#include <stdio.h> /* fprintf(), stderr, getline(),
44
stdin, feof(), fputc(), vfprintf(),
45
vasprintf() */
42
stdin, feof(), perror(), fputc(),
43
getopt_long */
46
44
#include <errno.h> /* errno, EBADF, ENOTTY, EINVAL,
47
45
EFAULT, EFBIG, EIO, ENOSPC, EINTR
48
46
*/
49
#include <error.h> /* error() */
50
47
#include <iso646.h> /* or, not */
51
48
#include <stdbool.h> /* bool, false, true */
52
#include <inttypes.h> /* strtoumax() */
53
#include <sys/stat.h> /* struct stat, lstat(), open() */
54
#include <string.h> /* strlen, rindex, memcmp, strerror()
55
*/
49
#include <string.h> /* strlen, rindex, strncmp, strcmp */
56
50
#include <argp.h> /* struct argp_option, struct
57
51
argp_state, struct argp,
58
52
argp_parse(), error_t,
60
54
ARGP_ERR_UNKNOWN */
61
55
#include <sysexits.h> /* EX_SOFTWARE, EX_OSERR,
62
56
EX_UNAVAILABLE, EX_IOERR, EX_OK */
63
#include <fcntl.h> /* open() */
64
#include <stdarg.h> /* va_list, va_start(), ... */
65
57
66
58
volatile sig_atomic_t quit_now = 0;
67
59
int signal_received;
68
60
bool debug = false;
69
61
const char *argp_program_version = "password-prompt " VERSION;
70
const char *argp_program_bug_address = "<mandos@recompile.se>";
71
72
/* Needed for conflict resolution */
73
const char plymouth_name[] = "plymouthd";
74
75
__attribute__((format (gnu_printf, 2, 3), nonnull(1)))
76
int fprintf_plus(FILE *stream, const char *format, ...){
77
va_list ap;
78
va_start (ap, format);
79
80
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
81
program_invocation_short_name));
82
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
83
}
84
85
/* Function to use when printing errors */
86
__attribute__((format (gnu_printf, 3, 4)))
87
void error_plus(int status, int errnum, const char *formatstring,
88
...){
89
va_list ap;
90
char *text;
91
int ret;
92
93
va_start(ap, formatstring);
94
ret = vasprintf(&text, formatstring, ap);
95
if (ret == -1){
96
fprintf(stderr, "Mandos plugin %s: ",
97
program_invocation_short_name);
98
vfprintf(stderr, formatstring, ap);
99
fprintf(stderr, ": %s\n", strerror(errnum));
100
error(status, errno, "vasprintf while printing error");
101
return;
102
}
103
fprintf(stderr, "Mandos plugin ");
104
error(status, errnum, "%s", text);
105
free(text);
106
}
62
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
107
63
108
64
static void termination_handler(int signum){
109
65
if(quit_now){
113
69
signal_received = signum;
114
70
}
115
71
116
bool conflict_detection(void){
117
118
/* plymouth conflicts with password-prompt since both want to read
119
from the terminal. Password-prompt will exit if it detects
120
plymouth since plymouth performs the same functionality.
121
*/
122
__attribute__((nonnull))
123
int is_plymouth(const struct dirent *proc_entry){
124
int ret;
125
int cl_fd;
126
{
127
uintmax_t proc_id;
128
char *tmp;
129
errno = 0;
130
proc_id = strtoumax(proc_entry->d_name, &tmp, 10);
131
132
if(errno != 0 or *tmp != '\0'
133
or proc_id != (uintmax_t)((pid_t)proc_id)){
134
return 0;
135
}
136
}
137
138
char *cmdline_filename;
139
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
140
proc_entry->d_name);
141
if(ret == -1){
142
error_plus(0, errno, "asprintf");
143
return 0;
144
}
145
146
/* Open /proc/<pid>/cmdline */
147
cl_fd = open(cmdline_filename, O_RDONLY);
148
free(cmdline_filename);
149
if(cl_fd == -1){
150
if(errno != ENOENT){
151
error_plus(0, errno, "open");
152
}
153
return 0;
154
}
155
156
char *cmdline = NULL;
157
{
158
size_t cmdline_len = 0;
159
size_t cmdline_allocated = 0;
160
char *tmp;
161
const size_t blocksize = 1024;
162
ssize_t sret;
163
do {
164
/* Allocate more space? */
165
if(cmdline_len + blocksize + 1 > cmdline_allocated){
166
tmp = realloc(cmdline, cmdline_allocated + blocksize + 1);
167
if(tmp == NULL){
168
error_plus(0, errno, "realloc");
169
free(cmdline);
170
close(cl_fd);
171
return 0;
172
}
173
cmdline = tmp;
174
cmdline_allocated += blocksize;
175
}
176
177
/* Read data */
178
sret = read(cl_fd, cmdline + cmdline_len,
179
cmdline_allocated - cmdline_len);
180
if(sret == -1){
181
error_plus(0, errno, "read");
182
free(cmdline);
183
close(cl_fd);
184
return 0;
185
}
186
cmdline_len += (size_t)sret;
187
} while(sret != 0);
188
ret = close(cl_fd);
189
if(ret == -1){
190
error_plus(0, errno, "close");
191
free(cmdline);
192
return 0;
193
}
194
cmdline[cmdline_len] = '\0'; /* Make sure it is terminated */
195
}
196
/* we now have cmdline */
197
198
/* get basename */
199
char *cmdline_base = strrchr(cmdline, '/');
200
if(cmdline_base != NULL){
201
cmdline_base += 1; /* skip the slash */
202
} else {
203
cmdline_base = cmdline;
204
}
205
206
if(strcmp(cmdline_base, plymouth_name) != 0){
207
if(debug){
208
fprintf(stderr, "\"%s\" is not \"%s\"\n", cmdline_base,
209
plymouth_name);
210
}
211
free(cmdline);
212
return 0;
213
}
214
if(debug){
215
fprintf(stderr, "\"%s\" equals \"%s\"\n", cmdline_base,
216
plymouth_name);
217
}
218
free(cmdline);
219
return 1;
220
}
221
222
struct dirent **direntries = NULL;
223
int ret;
224
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
225
if (ret == -1){
226
error_plus(1, errno, "scandir");
227
}
228
free(direntries);
229
return ret > 0;
230
}
231
232
233
72
int main(int argc, char **argv){
234
ssize_t sret;
235
int ret;
73
ssize_t ret;
236
74
size_t n;
237
75
struct termios t_new, t_old;
238
76
char *buffer = NULL;
248
86
.doc = "Prefix shown before the prompt", .group = 2 },
249
87
{ .name = "debug", .key = 128,
250
88
.doc = "Debug mode", .group = 3 },
251
/*
252
* These reproduce what we would get without ARGP_NO_HELP
253
*/
254
{ .name = "help", .key = '?',
255
.doc = "Give this help list", .group = -1 },
256
{ .name = "usage", .key = -3,
257
.doc = "Give a short usage message", .group = -1 },
258
{ .name = "version", .key = 'V',
259
.doc = "Print program version", .group = -1 },
260
89
{ .name = NULL }
261
90
};
262
91
263
__attribute__((nonnull(3)))
264
92
error_t parse_opt (int key, char *arg, struct argp_state *state){
265
errno = 0;
266
93
switch (key){
267
94
case 'p':
268
95
prefix = arg;
270
97
case 128:
271
98
debug = true;
272
99
break;
273
/*
274
* These reproduce what we would get without ARGP_NO_HELP
275
*/
276
case '?': /* --help */
277
argp_state_help(state, state->out_stream,
278
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
279
& ~(unsigned int)ARGP_HELP_EXIT_OK);
280
case -3: /* --usage */
281
argp_state_help(state, state->out_stream,
282
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
283
case 'V': /* --version */
284
fprintf(state->out_stream, "%s\n", argp_program_version);
285
exit(argp_err_exit_status);
100
case ARGP_KEY_ARG:
101
argp_usage(state);
102
break;
103
case ARGP_KEY_END:
286
104
break;
287
105
default:
288
106
return ARGP_ERR_UNKNOWN;
289
107
}
290
return errno;
108
return 0;
291
109
}
292
110
293
111
struct argp argp = { .options = options, .parser = parse_opt,
294
112
.args_doc = "",
295
113
.doc = "Mandos password-prompt -- Read and"
296
114
" output a password" };
297
ret = argp_parse(&argp, argc, argv,
298
ARGP_IN_ORDER | ARGP_NO_HELP, NULL, NULL);
299
switch(ret){
300
case 0:
301
break;
302
case ENOMEM:
303
default:
304
errno = ret;
305
error_plus(0, errno, "argp_parse");
306
return EX_OSERR;
307
case EINVAL:
308
return EX_USAGE;
115
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
116
if(ret == ARGP_ERR_UNKNOWN){
117
fprintf(stderr, "Unknown error while parsing arguments\n");
118
return EX_SOFTWARE;
309
119
}
310
120
}
311
121
312
122
if(debug){
313
123
fprintf(stderr, "Starting %s\n", argv[0]);
314
124
}
315
316
if (conflict_detection()){
317
if(debug){
318
fprintf(stderr, "Stopping %s because of conflict\n", argv[0]);
319
}
320
return EXIT_FAILURE;
321
}
322
323
125
if(debug){
324
126
fprintf(stderr, "Storing current terminal attributes\n");
325
127
}
326
128
327
129
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
328
130
int e = errno;
329
error_plus(0, errno, "tcgetattr");
131
perror("tcgetattr");
330
132
switch(e){
331
133
case EBADF:
332
134
case ENOTTY:
339
141
sigemptyset(&new_action.sa_mask);
340
142
ret = sigaddset(&new_action.sa_mask, SIGINT);
341
143
if(ret == -1){
342
error_plus(0, errno, "sigaddset");
144
perror("sigaddset");
343
145
return EX_OSERR;
344
146
}
345
147
ret = sigaddset(&new_action.sa_mask, SIGHUP);
346
148
if(ret == -1){
347
error_plus(0, errno, "sigaddset");
149
perror("sigaddset");
348
150
return EX_OSERR;
349
151
}
350
152
ret = sigaddset(&new_action.sa_mask, SIGTERM);
351
153
if(ret == -1){
352
error_plus(0, errno, "sigaddset");
154
perror("sigaddset");
353
155
return EX_OSERR;
354
156
}
355
157
/* Need to check if the handler is SIG_IGN before handling:
358
160
*/
359
161
ret = sigaction(SIGINT, NULL, &old_action);
360
162
if(ret == -1){
361
error_plus(0, errno, "sigaction");
163
perror("sigaction");
362
164
return EX_OSERR;
363
165
}
364
166
if(old_action.sa_handler != SIG_IGN){
365
167
ret = sigaction(SIGINT, &new_action, NULL);
366
168
if(ret == -1){
367
error_plus(0, errno, "sigaction");
169
perror("sigaction");
368
170
return EX_OSERR;
369
171
}
370
172
}
371
173
ret = sigaction(SIGHUP, NULL, &old_action);
372
174
if(ret == -1){
373
error_plus(0, errno, "sigaction");
175
perror("sigaction");
374
176
return EX_OSERR;
375
177
}
376
178
if(old_action.sa_handler != SIG_IGN){
377
179
ret = sigaction(SIGHUP, &new_action, NULL);
378
180
if(ret == -1){
379
error_plus(0, errno, "sigaction");
181
perror("sigaction");
380
182
return EX_OSERR;
381
183
}
382
184
}
383
185
ret = sigaction(SIGTERM, NULL, &old_action);
384
186
if(ret == -1){
385
error_plus(0, errno, "sigaction");
187
perror("sigaction");
386
188
return EX_OSERR;
387
189
}
388
190
if(old_action.sa_handler != SIG_IGN){
389
191
ret = sigaction(SIGTERM, &new_action, NULL);
390
192
if(ret == -1){
391
error_plus(0, errno, "sigaction");
193
perror("sigaction");
392
194
return EX_OSERR;
393
195
}
394
196
}
402
204
t_new.c_lflag &= ~(tcflag_t)ECHO;
403
205
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
404
206
int e = errno;
405
error_plus(0, errno, "tcsetattr-echo");
207
perror("tcsetattr-echo");
406
208
switch(e){
407
209
case EBADF:
408
210
case ENOTTY:
429
231
fprintf(stderr, "%s ", prefix);
430
232
}
431
233
{
432
const char *cryptsource = getenv("CRYPTTAB_SOURCE");
433
const char *crypttarget = getenv("CRYPTTAB_NAME");
434
/* Before cryptsetup 1.1.0~rc2 */
435
if(cryptsource == NULL){
436
cryptsource = getenv("cryptsource");
437
}
438
if(crypttarget == NULL){
439
crypttarget = getenv("crypttarget");
440
}
441
const char *const prompt1 = "Unlocking the disk";
442
const char *const prompt2 = "Enter passphrase";
234
const char *cryptsource = getenv("cryptsource");
235
const char *crypttarget = getenv("crypttarget");
236
const char *const prompt
237
= "Enter passphrase to unlock the disk";
443
238
if(cryptsource == NULL){
444
239
if(crypttarget == NULL){
445
fprintf(stderr, "%s to unlock the disk: ", prompt2);
240
fprintf(stderr, "%s: ", prompt);
446
241
} else {
447
fprintf(stderr, "%s (%s)\n%s: ", prompt1, crypttarget,
448
prompt2);
242
fprintf(stderr, "%s (%s): ", prompt, crypttarget);
449
243
}
450
244
} else {
451
245
if(crypttarget == NULL){
452
fprintf(stderr, "%s %s\n%s: ", prompt1, cryptsource,
453
prompt2);
246
fprintf(stderr, "%s %s: ", prompt, cryptsource);
454
247
} else {
455
fprintf(stderr, "%s %s (%s)\n%s: ", prompt1, cryptsource,
456
crypttarget, prompt2);
248
fprintf(stderr, "%s %s (%s): ", prompt, cryptsource,
249
crypttarget);
457
250
}
458
251
}
459
252
}
460
sret = getline(&buffer, &n, stdin);
461
if(sret > 0){
253
ret = getline(&buffer, &n, stdin);
254
if(ret > 0){
462
255
status = EXIT_SUCCESS;
463
256
/* Make n = data size instead of allocated buffer size */
464
n = (size_t)sret;
257
n = (size_t)ret;
465
258
/* Strip final newline */
466
259
if(n > 0 and buffer[n-1] == '\n'){
467
260
buffer[n-1] = '\0'; /* not strictly necessary */
469
262
}
470
263
size_t written = 0;
471
264
while(written < n){
472
sret = write(STDOUT_FILENO, buffer + written, n - written);
473
if(sret < 0){
265
ret = write(STDOUT_FILENO, buffer + written, n - written);
266
if(ret < 0){
474
267
int e = errno;
475
error_plus(0, errno, "write");
268
perror("write");
476
269
switch(e){
477
270
case EBADF:
478
271
case EFAULT:
489
282
}
490
283
break;
491
284
}
492
written += (size_t)sret;
285
written += (size_t)ret;
493
286
}
494
sret = close(STDOUT_FILENO);
495
if(sret == -1){
287
ret = close(STDOUT_FILENO);
288
if(ret == -1){
496
289
int e = errno;
497
error_plus(0, errno, "close");
290
perror("close");
498
291
switch(e){
499
292
case EBADF:
500
293
status = EX_OSFILE;
507
300
}
508
301
break;
509
302
}
510
if(sret < 0){
303
if(ret < 0){
511
304
int e = errno;
512
305
if(errno != EINTR and not feof(stdin)){
513
error_plus(0, errno, "getline");
306
perror("getline");
514
307
switch(e){
515
308
case EBADF:
516
309
status = EX_UNAVAILABLE;
517
break;
518
310
case EIO:
519
311
case EINVAL:
520
312
default:
524
316
break;
525
317
}
526
318
}
527
/* if(sret == 0), then the only sensible thing to do is to retry
528
to read from stdin */
319
/* if(ret == 0), then the only sensible thing to do is to retry to
320
read from stdin */
529
321
fputc('\n', stderr);
530
322
if(debug and not quit_now){
531
323
/* If quit_now is nonzero, we were interrupted by a signal, and
540
332
fprintf(stderr, "Restoring terminal attributes\n");
541
333
}
542
334
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
543
error_plus(0, errno, "tcsetattr+echo");
335
perror("tcsetattr+echo");
544
336
}
545
337
546
338
if(quit_now){
548
340
old_action.sa_handler = SIG_DFL;
549
341
ret = sigaction(signal_received, &old_action, NULL);
550
342
if(ret == -1){
551
error_plus(0, errno, "sigaction");
343
perror("sigaction");
552
344
}
553
345
raise(signal_received);
554
346
}
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