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- Committer: Teddy Hogeborn
- Date: 2009-02-23 11:52:42 UTC
- Revision ID: teddy@fukt.bsnet.se-20090223115242-5930ewin7m4o6zpr
* README (The Plugin System): Improve wording.
added
removed
plugins.d/password-prompt.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
3
* Password-prompt - Read a password from the terminal and print it
4
4
*
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>.
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* Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
23
* <https://www.fukt.bsnet.se/~teddy/>.
23
24
*/
24
25
25
26
#define _GNU_SOURCE /* getline() */
32
33
#include <signal.h> /* sig_atomic_t, raise(), struct
33
34
sigaction, sigemptyset(),
34
35
sigaction(), sigaddset(), SIGINT,
35
SIGQUIT, SIGHUP, SIGTERM,
36
raise() */
36
SIGQUIT, SIGHUP, SIGTERM */
37
37
#include <stddef.h> /* NULL, size_t, ssize_t */
38
38
#include <sys/types.h> /* ssize_t */
39
39
#include <stdlib.h> /* EXIT_SUCCESS, EXIT_FAILURE,
40
getenv() */
40
getopt_long, getenv() */
41
41
#include <stdio.h> /* fprintf(), stderr, getline(),
42
stdin, feof(), fputc()
43
*/
44
#include <errno.h> /* errno, EBADF, ENOTTY, EINVAL,
45
EFAULT, EFBIG, EIO, ENOSPC, EINTR
46
*/
47
#include <error.h> /* error() */
42
stdin, feof(), perror(), fputc(),
43
stdout, getopt_long */
44
#include <errno.h> /* errno, EINVAL */
48
45
#include <iso646.h> /* or, not */
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46
#include <stdbool.h> /* bool, false, true */
50
#include <string.h> /* strlen, rindex */
47
#include <string.h> /* strlen, rindex, strncmp, strcmp */
51
48
#include <argp.h> /* struct argp_option, struct
52
49
argp_state, struct argp,
53
50
argp_parse(), error_t,
54
51
ARGP_KEY_ARG, ARGP_KEY_END,
55
52
ARGP_ERR_UNKNOWN */
56
#include <sysexits.h> /* EX_SOFTWARE, EX_OSERR,
57
EX_UNAVAILABLE, EX_IOERR, EX_OK */
58
53
59
54
volatile sig_atomic_t quit_now = 0;
60
int signal_received;
61
55
bool debug = false;
62
56
const char *argp_program_version = "password-prompt " VERSION;
63
57
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
64
58
65
static void termination_handler(int signum){
66
if(quit_now){
67
return;
68
}
59
static void termination_handler(__attribute__((unused))int signum){
69
60
quit_now = 1;
70
signal_received = signum;
71
61
}
72
62
73
63
int main(int argc, char **argv){
74
ssize_t sret;
75
int ret;
64
ssize_t ret;
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65
size_t n;
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66
struct termios t_new, t_old;
78
67
char *buffer = NULL;
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77
.doc = "Prefix shown before the prompt", .group = 2 },
89
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{ .name = "debug", .key = 128,
90
79
.doc = "Debug mode", .group = 3 },
91
/*
92
* These reproduce what we would get without ARGP_NO_HELP
93
*/
94
{ .name = "help", .key = '?',
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.doc = "Give this help list", .group = -1 },
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{ .name = "usage", .key = -3,
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.doc = "Give a short usage message", .group = -1 },
98
{ .name = "version", .key = 'V',
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.doc = "Print program version", .group = -1 },
100
80
{ .name = NULL }
101
81
};
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82
103
83
error_t parse_opt (int key, char *arg, struct argp_state *state){
104
errno = 0;
105
84
switch (key){
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85
case 'p':
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86
prefix = arg;
109
88
case 128:
110
89
debug = true;
111
90
break;
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/*
113
* These reproduce what we would get without ARGP_NO_HELP
114
*/
115
case '?': /* --help */
116
argp_state_help(state, state->out_stream,
117
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
118
& ~(unsigned int)ARGP_HELP_EXIT_OK);
119
case -3: /* --usage */
120
argp_state_help(state, state->out_stream,
121
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
122
case 'V': /* --version */
123
fprintf(state->out_stream, "%s\n", argp_program_version);
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exit(argp_err_exit_status);
91
case ARGP_KEY_ARG:
92
argp_usage(state);
93
break;
94
case ARGP_KEY_END:
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95
break;
126
96
default:
127
97
return ARGP_ERR_UNKNOWN;
128
98
}
129
return errno;
99
return 0;
130
100
}
131
101
132
102
struct argp argp = { .options = options, .parser = parse_opt,
133
103
.args_doc = "",
134
104
.doc = "Mandos password-prompt -- Read and"
135
105
" output a password" };
136
ret = argp_parse(&argp, argc, argv,
137
ARGP_IN_ORDER | ARGP_NO_HELP, NULL, NULL);
138
switch(ret){
139
case 0:
140
break;
141
case ENOMEM:
142
default:
143
errno = ret;
144
error(0, errno, "argp_parse");
145
return EX_OSERR;
146
case EINVAL:
147
return EX_USAGE;
106
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
107
if(ret == ARGP_ERR_UNKNOWN){
108
fprintf(stderr, "Unknown error while parsing arguments\n");
109
return EXIT_FAILURE;
148
110
}
149
111
}
150
112
156
118
}
157
119
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120
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
159
int e = errno;
160
error(0, errno, "tcgetattr");
161
switch(e){
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case EBADF:
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case ENOTTY:
164
return EX_UNAVAILABLE;
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default:
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return EX_OSERR;
167
}
121
perror("tcgetattr");
122
return EXIT_FAILURE;
168
123
}
169
124
170
125
sigemptyset(&new_action.sa_mask);
171
ret = sigaddset(&new_action.sa_mask, SIGINT);
172
if(ret == -1){
173
error(0, errno, "sigaddset");
174
return EX_OSERR;
175
}
176
ret = sigaddset(&new_action.sa_mask, SIGHUP);
177
if(ret == -1){
178
error(0, errno, "sigaddset");
179
return EX_OSERR;
180
}
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ret = sigaddset(&new_action.sa_mask, SIGTERM);
182
if(ret == -1){
183
error(0, errno, "sigaddset");
184
return EX_OSERR;
185
}
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/* Need to check if the handler is SIG_IGN before handling:
187
| [[info:libc:Initial Signal Actions]] |
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| [[info:libc:Basic Signal Handling]] |
189
*/
126
sigaddset(&new_action.sa_mask, SIGINT);
127
sigaddset(&new_action.sa_mask, SIGHUP);
128
sigaddset(&new_action.sa_mask, SIGTERM);
190
129
ret = sigaction(SIGINT, NULL, &old_action);
191
130
if(ret == -1){
192
error(0, errno, "sigaction");
193
return EX_OSERR;
131
perror("sigaction");
132
return EXIT_FAILURE;
194
133
}
195
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if(old_action.sa_handler != SIG_IGN){
196
135
ret = sigaction(SIGINT, &new_action, NULL);
197
136
if(ret == -1){
198
error(0, errno, "sigaction");
199
return EX_OSERR;
137
perror("sigaction");
138
return EXIT_FAILURE;
200
139
}
201
140
}
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ret = sigaction(SIGHUP, NULL, &old_action);
203
142
if(ret == -1){
204
error(0, errno, "sigaction");
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return EX_OSERR;
143
perror("sigaction");
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return EXIT_FAILURE;
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}
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if(old_action.sa_handler != SIG_IGN){
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ret = sigaction(SIGHUP, &new_action, NULL);
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if(ret == -1){
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error(0, errno, "sigaction");
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return EX_OSERR;
149
perror("sigaction");
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return EXIT_FAILURE;
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}
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}
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ret = sigaction(SIGTERM, NULL, &old_action);
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if(ret == -1){
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error(0, errno, "sigaction");
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return EX_OSERR;
155
perror("sigaction");
156
return EXIT_FAILURE;
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157
}
219
158
if(old_action.sa_handler != SIG_IGN){
220
159
ret = sigaction(SIGTERM, &new_action, NULL);
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160
if(ret == -1){
222
error(0, errno, "sigaction");
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return EX_OSERR;
161
perror("sigaction");
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return EXIT_FAILURE;
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}
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164
}
226
165
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}
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t_new = t_old;
233
t_new.c_lflag &= ~(tcflag_t)ECHO;
172
t_new.c_lflag &= ~ECHO;
234
173
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
235
int e = errno;
236
error(0, errno, "tcsetattr-echo");
237
switch(e){
238
case EBADF:
239
case ENOTTY:
240
return EX_UNAVAILABLE;
241
case EINVAL:
242
default:
243
return EX_OSERR;
244
}
174
perror("tcsetattr-echo");
175
return EXIT_FAILURE;
245
176
}
246
177
247
178
if(debug){
248
179
fprintf(stderr, "Waiting for input from stdin \n");
249
180
}
260
191
fprintf(stderr, "%s ", prefix);
261
192
}
262
193
{
263
const char *cryptsource = getenv("CRYPTTAB_SOURCE");
264
const char *crypttarget = getenv("CRYPTTAB_NAME");
265
/* Before cryptsetup 1.1.0~rc2 */
266
if(cryptsource == NULL){
267
cryptsource = getenv("cryptsource");
268
}
269
if(crypttarget == NULL){
270
crypttarget = getenv("crypttarget");
271
}
272
const char *const prompt1 = "Unlocking the disk";
273
const char *const prompt2 = "Enter passphrase";
194
const char *cryptsource = getenv("cryptsource");
195
const char *crypttarget = getenv("crypttarget");
196
const char *const prompt
197
= "Enter passphrase to unlock the disk";
274
198
if(cryptsource == NULL){
275
199
if(crypttarget == NULL){
276
fprintf(stderr, "%s to unlock the disk: ", prompt2);
200
fprintf(stderr, "%s: ", prompt);
277
201
} else {
278
fprintf(stderr, "%s (%s)\n%s: ", prompt1, crypttarget,
279
prompt2);
202
fprintf(stderr, "%s (%s): ", prompt, crypttarget);
280
203
}
281
204
} else {
282
205
if(crypttarget == NULL){
283
fprintf(stderr, "%s %s\n%s: ", prompt1, cryptsource,
284
prompt2);
206
fprintf(stderr, "%s %s: ", prompt, cryptsource);
285
207
} else {
286
fprintf(stderr, "%s %s (%s)\n%s: ", prompt1, cryptsource,
287
crypttarget, prompt2);
208
fprintf(stderr, "%s %s (%s): ", prompt, cryptsource,
209
crypttarget);
288
210
}
289
211
}
290
212
}
291
sret = getline(&buffer, &n, stdin);
292
if(sret > 0){
213
ret = getline(&buffer, &n, stdin);
214
if(ret > 0){
293
215
status = EXIT_SUCCESS;
294
216
/* Make n = data size instead of allocated buffer size */
295
n = (size_t)sret;
217
n = (size_t)ret;
296
218
/* Strip final newline */
297
if(n > 0 and buffer[n-1] == '\n'){
219
if(n>0 and buffer[n-1] == '\n'){
298
220
buffer[n-1] = '\0'; /* not strictly necessary */
299
221
n--;
300
222
}
301
223
size_t written = 0;
302
224
while(written < n){
303
sret = write(STDOUT_FILENO, buffer + written, n - written);
304
if(sret < 0){
305
int e = errno;
306
error(0, errno, "write");
307
switch(e){
308
case EBADF:
309
case EFAULT:
310
case EINVAL:
311
case EFBIG:
312
case EIO:
313
case ENOSPC:
314
default:
315
status = EX_IOERR;
316
break;
317
case EINTR:
318
status = EXIT_FAILURE;
319
break;
320
}
321
break;
322
}
323
written += (size_t)sret;
324
}
325
sret = close(STDOUT_FILENO);
326
if(sret == -1){
327
int e = errno;
328
error(0, errno, "close");
329
switch(e){
330
case EBADF:
331
status = EX_OSFILE;
332
break;
333
case EIO:
334
default:
335
status = EX_IOERR;
336
break;
337
}
225
ret = write(STDOUT_FILENO, buffer + written, n - written);
226
if(ret < 0){
227
perror("write");
228
status = EXIT_FAILURE;
229
break;
230
}
231
written += (size_t)ret;
338
232
}
339
233
break;
340
234
}
341
if(sret < 0){
342
int e = errno;
235
if(ret < 0){
343
236
if(errno != EINTR and not feof(stdin)){
344
error(0, errno, "getline");
345
switch(e){
346
case EBADF:
347
status = EX_UNAVAILABLE;
348
case EIO:
349
case EINVAL:
350
default:
351
status = EX_IOERR;
352
break;
353
}
237
perror("getline");
238
status = EXIT_FAILURE;
354
239
break;
355
240
}
356
241
}
357
/* if(sret == 0), then the only sensible thing to do is to retry to
242
/* if(ret == 0), then the only sensible thing to do is to retry to
358
243
read from stdin */
359
244
fputc('\n', stderr);
360
if(debug and not quit_now){
245
if(debug and quit_now == 0){
361
246
/* If quit_now is nonzero, we were interrupted by a signal, and
362
247
will print that later, so no need to show this too. */
363
248
fprintf(stderr, "getline() returned 0, retrying.\n");
370
255
fprintf(stderr, "Restoring terminal attributes\n");
371
256
}
372
257
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
373
error(0, errno, "tcsetattr+echo");
374
}
375
376
if(quit_now){
377
sigemptyset(&old_action.sa_mask);
378
old_action.sa_handler = SIG_DFL;
379
ret = sigaction(signal_received, &old_action, NULL);
380
if(ret == -1){
381
error(0, errno, "sigaction");
382
}
383
raise(signal_received);
258
perror("tcsetattr+echo");
384
259
}
385
260
386
261
if(debug){
387
262
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
388
263
status);
389
264
}
390
if(status == EXIT_SUCCESS or status == EX_OK){
265
if(status == EXIT_SUCCESS){
391
266
fputc('\n', stderr);
392
267
}
393
268
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