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- Committer: Björn Påhlsson
- Date: 2008-08-15 20:47:22 UTC
- mfrom: (76 mandos)
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 77.
- Revision ID: belorn@braxen-20080815204722-yvylhrvub57csggz
merge + minor adjustments
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
plugins.d/password-prompt.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
*
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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
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* <http://www.gnu.org/licenses/>.
21
20
*
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* Contact the authors at <mandos@fukt.bsnet.se>.
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* Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
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* <https://www.fukt.bsnet.se/~teddy/>.
23
23
*/
24
24
25
25
#define _GNU_SOURCE /* getline() */
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() */
35
SIGQUIT, SIGHUP, SIGTERM */
37
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#include <stddef.h> /* NULL, size_t, ssize_t */
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#include <sys/types.h> /* ssize_t */
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38
#include <stdlib.h> /* EXIT_SUCCESS, EXIT_FAILURE,
40
getenv() */
39
getopt_long */
41
40
#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() */
41
stdin, feof(), perror(), fputc(),
42
stdout, getopt_long */
43
#include <errno.h> /* errno, EINVAL */
48
44
#include <iso646.h> /* or, not */
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#include <stdbool.h> /* bool, false, true */
50
#include <string.h> /* strlen, rindex */
46
#include <string.h> /* strlen, rindex, strncmp, strcmp */
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47
#include <argp.h> /* struct argp_option, struct
52
48
argp_state, struct argp,
53
49
argp_parse(), error_t,
54
50
ARGP_KEY_ARG, ARGP_KEY_END,
55
51
ARGP_ERR_UNKNOWN */
56
#include <sysexits.h> /* EX_SOFTWARE, EX_OSERR,
57
EX_UNAVAILABLE, EX_IOERR, EX_OK */
58
52
59
volatile sig_atomic_t quit_now = 0;
60
int signal_received;
53
volatile bool quit_now = false;
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54
bool debug = false;
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const char *argp_program_version = "password-prompt " VERSION;
55
const char *argp_program_version = "password-prompt 1.0";
63
56
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
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57
65
static void termination_handler(int signum){
66
if(quit_now){
67
return;
68
}
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quit_now = 1;
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signal_received = signum;
58
static void termination_handler(__attribute__((unused))int signum){
59
quit_now = true;
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60
}
72
61
73
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int main(int argc, char **argv){
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ssize_t sret;
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int ret;
63
ssize_t ret;
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64
size_t n;
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65
struct termios t_new, t_old;
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66
char *buffer = NULL;
85
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struct argp_option options[] = {
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{ .name = "prefix", .key = 'p',
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.arg = "PREFIX", .flags = 0,
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.doc = "Prefix shown before the prompt", .group = 2 },
76
.doc = "Prefix used before the passprompt", .group = 2 },
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{ .name = "debug", .key = 128,
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.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 },
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{ .name = NULL }
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80
};
102
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error_t parse_opt (int key, char *arg, struct argp_state *state){
104
errno = 0;
105
switch (key){
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error_t parse_opt (int key, char *arg, struct argp_state *state) {
83
/* Get the INPUT argument from `argp_parse', which we know is a
84
pointer to our plugin list pointer. */
85
switch (key) {
106
86
case 'p':
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87
prefix = arg;
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88
break;
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89
case 128:
110
90
debug = true;
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91
break;
112
/*
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);
124
exit(argp_err_exit_status);
92
case ARGP_KEY_ARG:
93
argp_usage (state);
94
break;
95
case ARGP_KEY_END:
125
96
break;
126
97
default:
127
98
return ARGP_ERR_UNKNOWN;
128
99
}
129
return errno;
100
return 0;
130
101
}
131
102
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struct argp argp = { .options = options, .parser = parse_opt,
133
104
.args_doc = "",
134
.doc = "Mandos password-prompt -- Read and"
135
" output a password" };
136
ret = argp_parse(&argp, argc, argv,
137
ARGP_IN_ORDER | ARGP_NO_HELP, NULL, NULL);
138
switch(ret){
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case 0:
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break;
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case ENOMEM:
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default:
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errno = ret;
144
error(0, errno, "argp_parse");
145
return EX_OSERR;
146
case EINVAL:
147
return EX_USAGE;
105
.doc = "Mandos Passprompt -- Provides a passprompt" };
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ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
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if (ret == ARGP_ERR_UNKNOWN){
108
fprintf(stderr, "Unknown error while parsing arguments\n");
109
return EXIT_FAILURE;
148
110
}
149
111
}
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if(debug){
112
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if (debug){
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114
fprintf(stderr, "Starting %s\n", argv[0]);
153
115
}
154
if(debug){
116
if (debug){
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fprintf(stderr, "Storing current terminal attributes\n");
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118
}
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119
158
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
159
int e = errno;
160
error(0, errno, "tcgetattr");
161
switch(e){
162
case EBADF:
163
case ENOTTY:
164
return EX_UNAVAILABLE;
165
default:
166
return EX_OSERR;
167
}
120
if (tcgetattr(STDIN_FILENO, &t_old) != 0){
121
return EXIT_FAILURE;
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}
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sigemptyset(&new_action.sa_mask);
171
ret = sigaddset(&new_action.sa_mask, SIGINT);
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if(ret == -1){
173
error(0, errno, "sigaddset");
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return EX_OSERR;
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}
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ret = sigaddset(&new_action.sa_mask, SIGHUP);
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if(ret == -1){
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error(0, errno, "sigaddset");
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return EX_OSERR;
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}
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ret = sigaddset(&new_action.sa_mask, SIGTERM);
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if(ret == -1){
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error(0, errno, "sigaddset");
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return EX_OSERR;
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}
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/* Need to check if the handler is SIG_IGN before handling:
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| [[info:libc:Initial Signal Actions]] |
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| [[info:libc:Basic Signal Handling]] |
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*/
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sigaddset(&new_action.sa_mask, SIGINT);
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sigaddset(&new_action.sa_mask, SIGHUP);
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sigaddset(&new_action.sa_mask, SIGTERM);
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ret = sigaction(SIGINT, 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;
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perror("sigaction");
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return EXIT_FAILURE;
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}
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if(old_action.sa_handler != SIG_IGN){
133
if (old_action.sa_handler != SIG_IGN){
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ret = sigaction(SIGINT, &new_action, NULL);
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if(ret == -1){
198
error(0, errno, "sigaction");
199
return EX_OSERR;
136
perror("sigaction");
137
return EXIT_FAILURE;
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138
}
201
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}
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ret = sigaction(SIGHUP, NULL, &old_action);
203
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if(ret == -1){
204
error(0, errno, "sigaction");
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return EX_OSERR;
142
perror("sigaction");
143
return EXIT_FAILURE;
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}
207
if(old_action.sa_handler != SIG_IGN){
145
if (old_action.sa_handler != SIG_IGN){
208
146
ret = sigaction(SIGHUP, &new_action, NULL);
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147
if(ret == -1){
210
error(0, errno, "sigaction");
211
return EX_OSERR;
148
perror("sigaction");
149
return EXIT_FAILURE;
212
150
}
213
151
}
214
152
ret = sigaction(SIGTERM, NULL, &old_action);
215
153
if(ret == -1){
216
error(0, errno, "sigaction");
217
return EX_OSERR;
154
perror("sigaction");
155
return EXIT_FAILURE;
218
156
}
219
if(old_action.sa_handler != SIG_IGN){
157
if (old_action.sa_handler != SIG_IGN){
220
158
ret = sigaction(SIGTERM, &new_action, NULL);
221
159
if(ret == -1){
222
error(0, errno, "sigaction");
223
return EX_OSERR;
160
perror("sigaction");
161
return EXIT_FAILURE;
224
162
}
225
163
}
226
164
227
165
228
if(debug){
166
if (debug){
229
167
fprintf(stderr, "Removing echo flag from terminal attributes\n");
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168
}
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t_new = t_old;
233
t_new.c_lflag &= ~(tcflag_t)ECHO;
234
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
}
171
t_new.c_lflag &= ~ECHO;
172
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
173
perror("tcsetattr-echo");
174
return EXIT_FAILURE;
245
175
}
246
247
if(debug){
176
177
if (debug){
248
178
fprintf(stderr, "Waiting for input from stdin \n");
249
179
}
250
180
while(true){
251
if(quit_now){
252
if(debug){
253
fprintf(stderr, "Interrupted by signal, exiting.\n");
254
}
181
if (quit_now){
255
182
status = EXIT_FAILURE;
256
183
break;
257
184
}
258
185
259
186
if(prefix){
260
fprintf(stderr, "%s ", prefix);
261
}
262
{
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";
274
if(cryptsource == NULL){
275
if(crypttarget == NULL){
276
fprintf(stderr, "%s to unlock the disk: ", prompt2);
277
} else {
278
fprintf(stderr, "%s (%s)\n%s: ", prompt1, crypttarget,
279
prompt2);
280
}
281
} else {
282
if(crypttarget == NULL){
283
fprintf(stderr, "%s %s\n%s: ", prompt1, cryptsource,
284
prompt2);
285
} else {
286
fprintf(stderr, "%s %s (%s)\n%s: ", prompt1, cryptsource,
287
crypttarget, prompt2);
288
}
289
}
290
}
291
sret = getline(&buffer, &n, stdin);
292
if(sret > 0){
187
fprintf(stderr, "%s Password: ", prefix);
188
} else {
189
fprintf(stderr, "Password: ");
190
}
191
ret = getline(&buffer, &n, stdin);
192
if (ret > 0){
193
fprintf(stdout, "%s", buffer);
293
194
status = EXIT_SUCCESS;
294
/* Make n = data size instead of allocated buffer size */
295
n = (size_t)sret;
296
/* Strip final newline */
297
if(n > 0 and buffer[n-1] == '\n'){
298
buffer[n-1] = '\0'; /* not strictly necessary */
299
n--;
300
}
301
size_t written = 0;
302
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
}
338
}
339
195
break;
340
196
}
341
if(sret < 0){
342
int e = errno;
343
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
}
197
if (ret < 0){
198
if (errno != EINTR and not feof(stdin)){
199
perror("getline");
200
status = EXIT_FAILURE;
354
201
break;
355
202
}
356
203
}
357
/* if(sret == 0), then the only sensible thing to do is to retry to
204
/* if(ret == 0), then the only sensible thing to do is to retry to
358
205
read from stdin */
359
206
fputc('\n', stderr);
360
if(debug and not quit_now){
361
/* If quit_now is nonzero, we were interrupted by a signal, and
362
will print that later, so no need to show this too. */
363
fprintf(stderr, "getline() returned 0, retrying.\n");
364
}
365
207
}
366
208
367
free(buffer);
368
369
if(debug){
209
if (debug){
370
210
fprintf(stderr, "Restoring terminal attributes\n");
371
211
}
372
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);
384
}
385
386
if(debug){
387
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
388
status);
389
}
390
if(status == EXIT_SUCCESS or status == EX_OK){
391
fputc('\n', stderr);
212
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
213
perror("tcsetattr+echo");
214
}
215
216
if (debug){
217
fprintf(stderr, "%s is exiting\n", argv[0]);
392
218
}
393
219
394
220
return status;
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