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- Committer: Björn Påhlsson
- Date: 2008-08-04 20:45:38 UTC
- mfrom: (44 mandos)
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 46.
- Revision ID: belorn@braxen-20080804204538-wom27iwv1fg8xiuh
Merge
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- files renamed:
- plugin-runner.c => plugbasedclient.c
- plugins.d/mandos-client.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos.conf => server.conf
- mandos => server.py
- files modified:
- Makefile
added
removed
plugins.d/passprompt.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Password-prompt - Read a password from the terminal and print it
4
*
5
* Copyright © 2008-2010 Teddy Hogeborn
6
* Copyright © 2008-2010 Björn Påhlsson
3
* Passprompt - Read a password from the terminal and print it
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
7
6
*
8
7
* This program is free software: you can redistribute it and/or
9
8
* modify it under the terms of the GNU General Public License as
19
18
* along with this program. If not, see
20
19
* <http://www.gnu.org/licenses/>.
21
20
*
22
* Contact the authors at <mandos@fukt.bsnet.se>.
21
* Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
22
* <https://www.fukt.bsnet.se/~teddy/>.
23
23
*/
24
24
25
#define _GNU_SOURCE /* getline(), asprintf() */
25
#define _GNU_SOURCE /* getline() */
26
26
27
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
SIGQUIT, SIGHUP, SIGTERM,
36
raise() */
37
#include <stddef.h> /* NULL, size_t, ssize_t */
38
#include <sys/types.h> /* ssize_t, struct dirent, pid_t,
39
ssize_t, open() */
35
SIGQUIT, SIGHUP, SIGTERM */
36
#include <stddef.h> /* NULL, size_t */
37
#include <sys/types.h> /* ssize_t */
40
38
#include <stdlib.h> /* EXIT_SUCCESS, EXIT_FAILURE,
41
getenv(), free() */
42
#include <dirent.h> /* scandir(), alphasort() */
39
getopt_long */
43
40
#include <stdio.h> /* fprintf(), stderr, getline(),
44
stdin, feof(), fputc()
45
*/
46
#include <errno.h> /* errno, EBADF, ENOTTY, EINVAL,
47
EFAULT, EFBIG, EIO, ENOSPC, EINTR
48
*/
49
#include <error.h> /* error() */
41
stdin, feof(), perror(), fputc(),
42
stdout, getopt_long */
43
#include <errno.h> /* errno, EINVAL */
50
44
#include <iso646.h> /* or, not */
51
45
#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 */
55
#include <argp.h> /* struct argp_option, struct
56
argp_state, struct argp,
57
argp_parse(), error_t,
58
ARGP_KEY_ARG, ARGP_KEY_END,
59
ARGP_ERR_UNKNOWN */
60
#include <sysexits.h> /* EX_SOFTWARE, EX_OSERR,
61
EX_UNAVAILABLE, EX_IOERR, EX_OK */
62
#include <fcntl.h> /* open() */
46
#include <string.h> /* strlen, rindex, strncmp, strcmp */
47
#include <argp.h> /* struct argp_option,
48
struct argp_state, struct argp,
49
argp_parse() */
63
50
64
volatile sig_atomic_t quit_now = 0;
65
int signal_received;
51
volatile bool quit_now = false;
66
52
bool debug = false;
67
const char *argp_program_version = "password-prompt " VERSION;
53
const char *argp_program_version = "passprompt 0.9";
68
54
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
69
55
70
/* Needed for conflict resolution */
71
const char plymouth_name[] = "plymouthd";
72
const char plymouth_alt_name[] = "plymouthd";
73
74
75
static void termination_handler(int signum){
76
if(quit_now){
77
return;
78
}
79
quit_now = 1;
80
signal_received = signum;
81
}
82
83
bool conflict_detection(void){
84
85
/* plymouth conflicts with password-prompt since both want to read
86
from the terminal. Password-prompt will exit if it detects
87
plymouth since plymouth performs the same functionality.
88
*/
89
int is_plymouth(const struct dirent *proc_entry){
90
int ret;
91
int cl_fd;
92
{
93
uintmax_t maxvalue;
94
char *tmp;
95
errno = 0;
96
maxvalue = strtoumax(proc_entry->d_name, &tmp, 10);
97
98
if(errno != 0 or *tmp != '\0'
99
or maxvalue != (uintmax_t)((pid_t)maxvalue)){
100
return 0;
101
}
102
}
103
104
char *cmdline_filename;
105
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline", proc_entry->d_name);
106
if(ret == -1){
107
error(0, errno, "asprintf");
108
return 0;
109
}
110
111
/* Open /proc/<pid>/cmdline */
112
cl_fd = open(cmdline_filename, O_RDONLY);
113
free(cmdline_filename);
114
if(cl_fd == -1){
115
error(0, errno, "open");
116
return 0;
117
}
118
119
char *cmdline = NULL;
120
{
121
size_t cmdline_len = 0;
122
size_t cmdline_allocated = 0;
123
char *tmp;
124
const size_t blocksize = 1024;
125
ssize_t sret;
126
do {
127
/* Allocate more space? */
128
if(cmdline_len + blocksize + 1 > cmdline_allocated){
129
tmp = realloc(cmdline, cmdline_allocated + blocksize + 1);
130
if(tmp == NULL){
131
error(0, errno, "realloc");
132
free(cmdline);
133
close(cl_fd);
134
return 0;
135
}
136
cmdline = tmp;
137
cmdline_allocated += blocksize;
138
}
139
140
/* Read data */
141
sret = read(cl_fd, cmdline + cmdline_len,
142
cmdline_allocated - cmdline_len);
143
if(sret == -1){
144
error(0, errno, "read");
145
free(cmdline);
146
close(cl_fd);
147
return 0;
148
}
149
cmdline_len += (size_t)sret;
150
} while(sret != 0);
151
ret = close(cl_fd);
152
if(ret == -1){
153
error(0, errno, "close");
154
free(cmdline);
155
return 0;
156
}
157
cmdline[cmdline_len] = '\0'; /* Make sure it is terminated */
158
}
159
/* we now have cmdline */
160
161
/* get basename */
162
char *cmdline_base = strrchr(cmdline, '/');
163
if(cmdline_base != NULL){
164
cmdline_base += 1; /* skip the slash */
165
} else {
166
cmdline_base = cmdline;
167
}
168
169
if((strcmp(cmdline_base, plymouth_name) != 0)
170
and (strcmp(cmdline_base, plymouth_alt_name) != 0)){
171
free(cmdline);
172
return 0;
173
}
174
free(cmdline);
175
return 1;
176
}
177
178
struct dirent **direntries;
179
int ret;
180
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
181
if (ret == -1){
182
error(1, errno, "scandir");
183
}
184
return ret > 0;
185
}
186
56
static void termination_handler(__attribute__((unused))int signum){
57
quit_now = true;
58
}
187
59
188
60
int main(int argc, char **argv){
189
ssize_t sret;
190
int ret;
61
ssize_t ret;
191
62
size_t n;
192
63
struct termios t_new, t_old;
193
64
char *buffer = NULL;
200
71
struct argp_option options[] = {
201
72
{ .name = "prefix", .key = 'p',
202
73
.arg = "PREFIX", .flags = 0,
203
.doc = "Prefix shown before the prompt", .group = 2 },
74
.doc = "Prefix used before the passprompt", .group = 2 },
204
75
{ .name = "debug", .key = 128,
205
76
.doc = "Debug mode", .group = 3 },
206
/*
207
* These reproduce what we would get without ARGP_NO_HELP
208
*/
209
{ .name = "help", .key = '?',
210
.doc = "Give this help list", .group = -1 },
211
{ .name = "usage", .key = -3,
212
.doc = "Give a short usage message", .group = -1 },
213
{ .name = "version", .key = 'V',
214
.doc = "Print program version", .group = -1 },
215
77
{ .name = NULL }
216
78
};
217
218
error_t parse_opt (int key, char *arg, struct argp_state *state){
219
errno = 0;
220
switch (key){
79
80
error_t parse_opt (int key, char *arg, struct argp_state *state) {
81
/* Get the INPUT argument from `argp_parse', which we know is a
82
pointer to our plugin list pointer. */
83
switch (key) {
221
84
case 'p':
222
85
prefix = arg;
223
86
break;
224
87
case 128:
225
88
debug = true;
226
89
break;
227
/*
228
* These reproduce what we would get without ARGP_NO_HELP
229
*/
230
case '?': /* --help */
231
argp_state_help(state, state->out_stream,
232
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
233
& ~(unsigned int)ARGP_HELP_EXIT_OK);
234
case -3: /* --usage */
235
argp_state_help(state, state->out_stream,
236
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
237
case 'V': /* --version */
238
fprintf(state->out_stream, "%s\n", argp_program_version);
239
exit(argp_err_exit_status);
90
case ARGP_KEY_ARG:
91
argp_usage (state);
92
break;
93
case ARGP_KEY_END:
240
94
break;
241
95
default:
242
96
return ARGP_ERR_UNKNOWN;
243
97
}
244
return errno;
98
return 0;
245
99
}
246
100
247
101
struct argp argp = { .options = options, .parser = parse_opt,
248
102
.args_doc = "",
249
.doc = "Mandos password-prompt -- Read and"
250
" output a password" };
251
ret = argp_parse(&argp, argc, argv,
252
ARGP_IN_ORDER | ARGP_NO_HELP, NULL, NULL);
253
switch(ret){
254
case 0:
255
break;
256
case ENOMEM:
257
default:
258
errno = ret;
259
error(0, errno, "argp_parse");
260
return EX_OSERR;
261
case EINVAL:
262
return EX_USAGE;
263
}
103
.doc = "Mandos Passprompt -- Provides a passprompt" };
104
argp_parse (&argp, argc, argv, 0, 0, NULL);
264
105
}
265
266
if(debug){
106
107
if (debug){
267
108
fprintf(stderr, "Starting %s\n", argv[0]);
268
109
}
269
270
if (conflict_detection()){
271
if(debug){
272
fprintf(stderr, "Stopping %s because of conflict", argv[0]);
273
}
274
return EXIT_FAILURE;
275
}
276
277
if(debug){
110
if (debug){
278
111
fprintf(stderr, "Storing current terminal attributes\n");
279
112
}
280
113
281
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
282
int e = errno;
283
error(0, errno, "tcgetattr");
284
switch(e){
285
case EBADF:
286
case ENOTTY:
287
return EX_UNAVAILABLE;
288
default:
289
return EX_OSERR;
290
}
114
if (tcgetattr(STDIN_FILENO, &t_old) != 0){
115
return EXIT_FAILURE;
291
116
}
292
117
293
118
sigemptyset(&new_action.sa_mask);
294
ret = sigaddset(&new_action.sa_mask, SIGINT);
295
if(ret == -1){
296
error(0, errno, "sigaddset");
297
return EX_OSERR;
298
}
299
ret = sigaddset(&new_action.sa_mask, SIGHUP);
300
if(ret == -1){
301
error(0, errno, "sigaddset");
302
return EX_OSERR;
303
}
304
ret = sigaddset(&new_action.sa_mask, SIGTERM);
305
if(ret == -1){
306
error(0, errno, "sigaddset");
307
return EX_OSERR;
308
}
309
/* Need to check if the handler is SIG_IGN before handling:
310
| [[info:libc:Initial Signal Actions]] |
311
| [[info:libc:Basic Signal Handling]] |
312
*/
313
ret = sigaction(SIGINT, NULL, &old_action);
314
if(ret == -1){
315
error(0, errno, "sigaction");
316
return EX_OSERR;
317
}
318
if(old_action.sa_handler != SIG_IGN){
319
ret = sigaction(SIGINT, &new_action, NULL);
320
if(ret == -1){
321
error(0, errno, "sigaction");
322
return EX_OSERR;
323
}
324
}
325
ret = sigaction(SIGHUP, NULL, &old_action);
326
if(ret == -1){
327
error(0, errno, "sigaction");
328
return EX_OSERR;
329
}
330
if(old_action.sa_handler != SIG_IGN){
331
ret = sigaction(SIGHUP, &new_action, NULL);
332
if(ret == -1){
333
error(0, errno, "sigaction");
334
return EX_OSERR;
335
}
336
}
337
ret = sigaction(SIGTERM, NULL, &old_action);
338
if(ret == -1){
339
error(0, errno, "sigaction");
340
return EX_OSERR;
341
}
342
if(old_action.sa_handler != SIG_IGN){
343
ret = sigaction(SIGTERM, &new_action, NULL);
344
if(ret == -1){
345
error(0, errno, "sigaction");
346
return EX_OSERR;
347
}
348
}
349
350
351
if(debug){
119
sigaddset(&new_action.sa_mask, SIGINT);
120
sigaddset(&new_action.sa_mask, SIGHUP);
121
sigaddset(&new_action.sa_mask, SIGTERM);
122
sigaction(SIGINT, NULL, &old_action);
123
if (old_action.sa_handler != SIG_IGN)
124
sigaction(SIGINT, &new_action, NULL);
125
sigaction(SIGHUP, NULL, &old_action);
126
if (old_action.sa_handler != SIG_IGN)
127
sigaction(SIGHUP, &new_action, NULL);
128
sigaction(SIGTERM, NULL, &old_action);
129
if (old_action.sa_handler != SIG_IGN)
130
sigaction(SIGTERM, &new_action, NULL);
131
132
133
if (debug){
352
134
fprintf(stderr, "Removing echo flag from terminal attributes\n");
353
135
}
354
136
355
137
t_new = t_old;
356
t_new.c_lflag &= ~(tcflag_t)ECHO;
357
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
358
int e = errno;
359
error(0, errno, "tcsetattr-echo");
360
switch(e){
361
case EBADF:
362
case ENOTTY:
363
return EX_UNAVAILABLE;
364
case EINVAL:
365
default:
366
return EX_OSERR;
367
}
138
t_new.c_lflag &= ~ECHO;
139
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
140
perror("tcsetattr-echo");
141
return EXIT_FAILURE;
368
142
}
369
370
if(debug){
143
144
if (debug){
371
145
fprintf(stderr, "Waiting for input from stdin \n");
372
146
}
373
147
while(true){
374
if(quit_now){
375
if(debug){
376
fprintf(stderr, "Interrupted by signal, exiting.\n");
377
}
148
if (quit_now){
378
149
status = EXIT_FAILURE;
379
150
break;
380
151
}
381
152
382
153
if(prefix){
383
fprintf(stderr, "%s ", prefix);
384
}
385
{
386
const char *cryptsource = getenv("CRYPTTAB_SOURCE");
387
const char *crypttarget = getenv("CRYPTTAB_NAME");
388
/* Before cryptsetup 1.1.0~rc2 */
389
if(cryptsource == NULL){
390
cryptsource = getenv("cryptsource");
391
}
392
if(crypttarget == NULL){
393
crypttarget = getenv("crypttarget");
394
}
395
const char *const prompt1 = "Unlocking the disk";
396
const char *const prompt2 = "Enter passphrase";
397
if(cryptsource == NULL){
398
if(crypttarget == NULL){
399
fprintf(stderr, "%s to unlock the disk: ", prompt2);
400
} else {
401
fprintf(stderr, "%s (%s)\n%s: ", prompt1, crypttarget,
402
prompt2);
403
}
404
} else {
405
if(crypttarget == NULL){
406
fprintf(stderr, "%s %s\n%s: ", prompt1, cryptsource,
407
prompt2);
408
} else {
409
fprintf(stderr, "%s %s (%s)\n%s: ", prompt1, cryptsource,
410
crypttarget, prompt2);
411
}
412
}
413
}
414
sret = getline(&buffer, &n, stdin);
415
if(sret > 0){
154
fprintf(stderr, "%s Password: ", prefix);
155
} else {
156
fprintf(stderr, "Password: ");
157
}
158
ret = getline(&buffer, &n, stdin);
159
if (ret > 0){
160
fprintf(stdout, "%s", buffer);
416
161
status = EXIT_SUCCESS;
417
/* Make n = data size instead of allocated buffer size */
418
n = (size_t)sret;
419
/* Strip final newline */
420
if(n > 0 and buffer[n-1] == '\n'){
421
buffer[n-1] = '\0'; /* not strictly necessary */
422
n--;
423
}
424
size_t written = 0;
425
while(written < n){
426
sret = write(STDOUT_FILENO, buffer + written, n - written);
427
if(sret < 0){
428
int e = errno;
429
error(0, errno, "write");
430
switch(e){
431
case EBADF:
432
case EFAULT:
433
case EINVAL:
434
case EFBIG:
435
case EIO:
436
case ENOSPC:
437
default:
438
status = EX_IOERR;
439
break;
440
case EINTR:
441
status = EXIT_FAILURE;
442
break;
443
}
444
break;
445
}
446
written += (size_t)sret;
447
}
448
sret = close(STDOUT_FILENO);
449
if(sret == -1){
450
int e = errno;
451
error(0, errno, "close");
452
switch(e){
453
case EBADF:
454
status = EX_OSFILE;
455
break;
456
case EIO:
457
default:
458
status = EX_IOERR;
459
break;
460
}
461
}
462
162
break;
463
163
}
464
if(sret < 0){
465
int e = errno;
466
if(errno != EINTR and not feof(stdin)){
467
error(0, errno, "getline");
468
switch(e){
469
case EBADF:
470
status = EX_UNAVAILABLE;
471
case EIO:
472
case EINVAL:
473
default:
474
status = EX_IOERR;
475
break;
476
}
164
if (ret < 0){
165
if (errno != EINTR and not feof(stdin)){
166
perror("getline");
167
status = EXIT_FAILURE;
477
168
break;
478
169
}
479
170
}
480
/* if(sret == 0), then the only sensible thing to do is to retry to
171
/* if(ret == 0), then the only sensible thing to do is to retry to
481
172
read from stdin */
482
173
fputc('\n', stderr);
483
if(debug and not quit_now){
484
/* If quit_now is nonzero, we were interrupted by a signal, and
485
will print that later, so no need to show this too. */
486
fprintf(stderr, "getline() returned 0, retrying.\n");
487
}
488
174
}
489
175
490
free(buffer);
491
492
if(debug){
176
if (debug){
493
177
fprintf(stderr, "Restoring terminal attributes\n");
494
178
}
495
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
496
error(0, errno, "tcsetattr+echo");
497
}
498
499
if(quit_now){
500
sigemptyset(&old_action.sa_mask);
501
old_action.sa_handler = SIG_DFL;
502
ret = sigaction(signal_received, &old_action, NULL);
503
if(ret == -1){
504
error(0, errno, "sigaction");
505
}
506
raise(signal_received);
507
}
508
509
if(debug){
510
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
511
status);
512
}
513
if(status == EXIT_SUCCESS or status == EX_OK){
514
fputc('\n', stderr);
179
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
180
perror("tcsetattr+echo");
181
}
182
183
if (debug){
184
fprintf(stderr, "%s is exiting\n", argv[0]);
515
185
}
516
186
517
187
return status;
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