To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/password-prompt.c
- browse files at revision 237.4.3
- compare with another revision
- download diff
- download tarball
- view history from revision 237.4.3
- Committer: Björn Påhlsson
- Date: 2010-10-02 16:57:03 UTC
- mfrom: (24.1.168 mandos)
- mto: (24.1.170 mandos) (237.4.29 release)
- mto: This revision was merged to the branch mainline in revision 453.
- Revision ID: belorn@fukt.bsnet.se-20101002165703-u41e3cdyj12t728p
Merge from trunk. Just a minor release to make it lintian clean.
- files removed:
- debian/mandos-client.examples
- 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 © 2008-2013 Teddy Hogeborn
6
* Copyright © 2008-2013 Björn Påhlsson
5
* Copyright © 2008-2010 Teddy Hogeborn
6
* Copyright © 2008-2010 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
getenv() */
43
41
#include <stdio.h> /* fprintf(), stderr, getline(),
44
stdin, feof(), fputc(), vfprintf(),
45
vasprintf() */
42
stdin, feof(), fputc()
43
*/
46
44
#include <errno.h> /* errno, EBADF, ENOTTY, EINVAL,
47
45
EFAULT, EFBIG, EIO, ENOSPC, EINTR
48
46
*/
49
47
#include <error.h> /* error() */
50
48
#include <iso646.h> /* or, not */
51
49
#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
*/
50
#include <string.h> /* strlen, rindex */
56
51
#include <argp.h> /* struct argp_option, struct
57
52
argp_state, struct argp,
58
53
argp_parse(), error_t,
60
55
ARGP_ERR_UNKNOWN */
61
56
#include <sysexits.h> /* EX_SOFTWARE, EX_OSERR,
62
57
EX_UNAVAILABLE, EX_IOERR, EX_OK */
63
#include <fcntl.h> /* open() */
64
#include <stdarg.h> /* va_list, va_start(), ... */
65
58
66
59
volatile sig_atomic_t quit_now = 0;
67
60
int signal_received;
68
61
bool debug = false;
69
62
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
}
63
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
107
64
108
65
static void termination_handler(int signum){
109
66
if(quit_now){
113
70
signal_received = signum;
114
71
}
115
72
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
73
int main(int argc, char **argv){
234
74
ssize_t sret;
235
75
int ret;
260
100
{ .name = NULL }
261
101
};
262
102
263
__attribute__((nonnull(3)))
264
103
error_t parse_opt (int key, char *arg, struct argp_state *state){
265
104
errno = 0;
266
105
switch (key){
302
141
case ENOMEM:
303
142
default:
304
143
errno = ret;
305
error_plus(0, errno, "argp_parse");
144
error(0, errno, "argp_parse");
306
145
return EX_OSERR;
307
146
case EINVAL:
308
147
return EX_USAGE;
312
151
if(debug){
313
152
fprintf(stderr, "Starting %s\n", argv[0]);
314
153
}
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
154
if(debug){
324
155
fprintf(stderr, "Storing current terminal attributes\n");
325
156
}
326
157
327
158
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
328
159
int e = errno;
329
error_plus(0, errno, "tcgetattr");
160
error(0, errno, "tcgetattr");
330
161
switch(e){
331
162
case EBADF:
332
163
case ENOTTY:
339
170
sigemptyset(&new_action.sa_mask);
340
171
ret = sigaddset(&new_action.sa_mask, SIGINT);
341
172
if(ret == -1){
342
error_plus(0, errno, "sigaddset");
173
error(0, errno, "sigaddset");
343
174
return EX_OSERR;
344
175
}
345
176
ret = sigaddset(&new_action.sa_mask, SIGHUP);
346
177
if(ret == -1){
347
error_plus(0, errno, "sigaddset");
178
error(0, errno, "sigaddset");
348
179
return EX_OSERR;
349
180
}
350
181
ret = sigaddset(&new_action.sa_mask, SIGTERM);
351
182
if(ret == -1){
352
error_plus(0, errno, "sigaddset");
183
error(0, errno, "sigaddset");
353
184
return EX_OSERR;
354
185
}
355
186
/* Need to check if the handler is SIG_IGN before handling:
358
189
*/
359
190
ret = sigaction(SIGINT, NULL, &old_action);
360
191
if(ret == -1){
361
error_plus(0, errno, "sigaction");
192
error(0, errno, "sigaction");
362
193
return EX_OSERR;
363
194
}
364
195
if(old_action.sa_handler != SIG_IGN){
365
196
ret = sigaction(SIGINT, &new_action, NULL);
366
197
if(ret == -1){
367
error_plus(0, errno, "sigaction");
198
error(0, errno, "sigaction");
368
199
return EX_OSERR;
369
200
}
370
201
}
371
202
ret = sigaction(SIGHUP, NULL, &old_action);
372
203
if(ret == -1){
373
error_plus(0, errno, "sigaction");
204
error(0, errno, "sigaction");
374
205
return EX_OSERR;
375
206
}
376
207
if(old_action.sa_handler != SIG_IGN){
377
208
ret = sigaction(SIGHUP, &new_action, NULL);
378
209
if(ret == -1){
379
error_plus(0, errno, "sigaction");
210
error(0, errno, "sigaction");
380
211
return EX_OSERR;
381
212
}
382
213
}
383
214
ret = sigaction(SIGTERM, NULL, &old_action);
384
215
if(ret == -1){
385
error_plus(0, errno, "sigaction");
216
error(0, errno, "sigaction");
386
217
return EX_OSERR;
387
218
}
388
219
if(old_action.sa_handler != SIG_IGN){
389
220
ret = sigaction(SIGTERM, &new_action, NULL);
390
221
if(ret == -1){
391
error_plus(0, errno, "sigaction");
222
error(0, errno, "sigaction");
392
223
return EX_OSERR;
393
224
}
394
225
}
402
233
t_new.c_lflag &= ~(tcflag_t)ECHO;
403
234
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
404
235
int e = errno;
405
error_plus(0, errno, "tcsetattr-echo");
236
error(0, errno, "tcsetattr-echo");
406
237
switch(e){
407
238
case EBADF:
408
239
case ENOTTY:
472
303
sret = write(STDOUT_FILENO, buffer + written, n - written);
473
304
if(sret < 0){
474
305
int e = errno;
475
error_plus(0, errno, "write");
306
error(0, errno, "write");
476
307
switch(e){
477
308
case EBADF:
478
309
case EFAULT:
494
325
sret = close(STDOUT_FILENO);
495
326
if(sret == -1){
496
327
int e = errno;
497
error_plus(0, errno, "close");
328
error(0, errno, "close");
498
329
switch(e){
499
330
case EBADF:
500
331
status = EX_OSFILE;
510
341
if(sret < 0){
511
342
int e = errno;
512
343
if(errno != EINTR and not feof(stdin)){
513
error_plus(0, errno, "getline");
344
error(0, errno, "getline");
514
345
switch(e){
515
346
case EBADF:
516
347
status = EX_UNAVAILABLE;
517
break;
518
348
case EIO:
519
349
case EINVAL:
520
350
default:
524
354
break;
525
355
}
526
356
}
527
/* if(sret == 0), then the only sensible thing to do is to retry
528
to read from stdin */
357
/* if(sret == 0), then the only sensible thing to do is to retry to
358
read from stdin */
529
359
fputc('\n', stderr);
530
360
if(debug and not quit_now){
531
361
/* If quit_now is nonzero, we were interrupted by a signal, and
540
370
fprintf(stderr, "Restoring terminal attributes\n");
541
371
}
542
372
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
543
error_plus(0, errno, "tcsetattr+echo");
373
error(0, errno, "tcsetattr+echo");
544
374
}
545
375
546
376
if(quit_now){
548
378
old_action.sa_handler = SIG_DFL;
549
379
ret = sigaction(signal_received, &old_action, NULL);
550
380
if(ret == -1){
551
error_plus(0, errno, "sigaction");
381
error(0, errno, "sigaction");
552
382
}
553
383
raise(signal_received);
554
384
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0