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237.2.123
(compared to revision 237.7.854)
: plugins.d/password-prompt.c
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- Committer: Teddy Hogeborn
- Date: 2009-09-05 17:39:34 UTC
- mto: (24.1.140 mandos) (237.12.2 mandos-persistent) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 264.
- Revision ID: teddy@fukt.bsnet.se-20090905173934-gs0r858omhudc71m
* plugin-runner.c (main): Move variables "tmpmax" and "tmp" into
the innermost scope possible.
the innermost scope possible.
- files added:
- initramfs-tools-hook-conf
- files removed:
- DBUS-API
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- 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 © 2008-2019, 2021-2022 Teddy Hogeborn
6
* Copyright © 2008-2019, 2021-2022 Björn Påhlsson
7
*
8
* This file is part of Mandos.
9
*
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
14
*
15
* Mandos is distributed in the hope that it will be useful, but
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
7
*
8
* This program is free software: you can redistribute it and/or
9
* modify it under the terms of the GNU General Public License as
10
* published by the Free Software Foundation, either version 3 of the
11
* License, or (at your option) any later version.
12
*
13
* This program is distributed in the hope that it will be useful, but
16
14
* WITHOUT ANY WARRANTY; without even the implied warranty of
17
15
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18
16
* General Public License for more details.
19
17
*
20
18
* You should have received a copy of the GNU General Public License
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
19
* along with this program. If not, see
20
* <http://www.gnu.org/licenses/>.
22
21
*
23
* Contact the authors at <mandos@recompile.se>.
22
* Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
23
* <https://www.fukt.bsnet.se/~teddy/>.
24
24
*/
25
25
26
#define _GNU_SOURCE /* vasprintf(),
27
program_invocation_short_name,
28
asprintf(), getline() */
29
#include <sys/types.h> /* sig_atomic_t, pid_t */
26
#define _GNU_SOURCE /* getline() */
27
28
#include <termios.h> /* struct termios, tcsetattr(),
29
TCSAFLUSH, tcgetattr(), ECHO */
30
#include <unistd.h> /* struct termios, tcsetattr(),
31
STDIN_FILENO, TCSAFLUSH,
32
tcgetattr(), ECHO */
33
#include <signal.h> /* sig_atomic_t, raise(), struct
34
sigaction, sigemptyset(),
35
sigaction(), sigaddset(), SIGINT,
36
SIGQUIT, SIGHUP, SIGTERM,
37
raise() */
38
#include <stddef.h> /* NULL, size_t, ssize_t */
39
#include <sys/types.h> /* ssize_t */
40
#include <stdlib.h> /* EXIT_SUCCESS, EXIT_FAILURE,
41
getopt_long, getenv() */
42
#include <stdio.h> /* fprintf(), stderr, getline(),
43
stdin, feof(), perror(), fputc(),
44
stdout, getopt_long */
45
#include <errno.h> /* errno, EINVAL */
46
#include <iso646.h> /* or, not */
30
47
#include <stdbool.h> /* bool, false, true */
31
#include <argp.h> /* argp_program_version,
32
argp_program_bug_address,
33
struct argp_option,
34
struct argp_state, argp_state_help,
35
ARGP_HELP_STD_HELP,
36
ARGP_HELP_EXIT_ERR,
37
ARGP_HELP_EXIT_OK, ARGP_HELP_USAGE,
38
argp_err_exit_status,
39
ARGP_ERR_UNKNOWN, argp_parse(),
40
ARGP_IN_ORDER, ARGP_NO_HELP */
41
#include <stdarg.h> /* va_list, va_start(), vfprintf() */
42
#include <stdio.h> /* vasprintf(), fprintf(), stderr,
43
vfprintf(), asprintf(), getline(),
44
stdin, feof(), clearerr(),
45
fputc() */
46
#include <errno.h> /* program_invocation_short_name,
47
errno, ENOENT, error_t, ENOMEM,
48
EINVAL, EBADF, ENOTTY, EFAULT,
49
EFBIG, EIO, ENOSPC, EINTR */
50
#include <string.h> /* strerror(), strrchr(), strcmp() */
51
#include <error.h> /* error() */
52
#include <stdlib.h> /* free(), realloc(), EXIT_SUCCESS,
53
EXIT_FAILURE, getenv() */
54
#include <unistd.h> /* access(), R_OK, ssize_t, close(),
55
read(), STDIN_FILENO, write(),
56
STDOUT_FILENO */
57
#include <dirent.h> /* struct dirent, scandir(),
58
alphasort() */
59
#include <inttypes.h> /* uintmax_t, strtoumax() */
60
#include <iso646.h> /* or, and, not */
61
#include <fcntl.h> /* open(), O_RDONLY */
62
#include <stddef.h> /* NULL, size_t */
63
#include <termios.h> /* struct termios, tcgetattr(),
64
tcflag_t, ECHO, tcsetattr(),
65
TCSAFLUSH */
66
#include <signal.h> /* struct sigaction, sigemptyset(),
67
sigaddset(), SIGINT, SIGHUP,
68
SIGTERM, SIG_IGN, SIG_DFL,
69
raise() */
70
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
71
EX_IOERR, EX_OSFILE, EX_OK */
48
#include <string.h> /* strlen, rindex, strncmp, strcmp */
49
#include <argp.h> /* struct argp_option, struct
50
argp_state, struct argp,
51
argp_parse(), error_t,
52
ARGP_KEY_ARG, ARGP_KEY_END,
53
ARGP_ERR_UNKNOWN */
72
54
73
55
volatile sig_atomic_t quit_now = 0;
74
56
int signal_received;
75
57
bool debug = false;
76
58
const char *argp_program_version = "password-prompt " VERSION;
77
const char *argp_program_bug_address = "<mandos@recompile.se>";
78
79
/* Needed for conflict resolution */
80
const char plymouth_name[] = "plymouthd";
81
82
/* Function to use when printing errors */
83
__attribute__((format (gnu_printf, 3, 4)))
84
void error_plus(int status, int errnum, const char *formatstring,
85
...){
86
va_list ap;
87
char *text;
88
int ret;
89
90
va_start(ap, formatstring);
91
ret = vasprintf(&text, formatstring, ap);
92
if(ret == -1){
93
fprintf(stderr, "Mandos plugin %s: ",
94
program_invocation_short_name);
95
vfprintf(stderr, formatstring, ap);
96
fprintf(stderr, ": %s\n", strerror(errnum));
97
error(status, errno, "vasprintf while printing error");
98
return;
99
}
100
fprintf(stderr, "Mandos plugin ");
101
error(status, errnum, "%s", text);
102
free(text);
103
}
59
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
104
60
105
61
static void termination_handler(int signum){
106
62
if(quit_now){
110
66
signal_received = signum;
111
67
}
112
68
113
bool conflict_detection(void){
114
115
/* plymouth conflicts with password-prompt since both want to read
116
from the terminal. Password-prompt will exit if it detects
117
plymouth since plymouth performs the same functionality.
118
*/
119
if(access("/run/plymouth/pid", R_OK) == 0){
120
return true;
121
}
122
123
__attribute__((nonnull))
124
int is_plymouth(const struct dirent *proc_entry){
125
int ret;
126
int cl_fd;
127
{
128
uintmax_t proc_id;
129
char *tmp;
130
errno = 0;
131
proc_id = strtoumax(proc_entry->d_name, &tmp, 10);
132
133
if(errno != 0 or *tmp != '\0'
134
or proc_id != (uintmax_t)((pid_t)proc_id)){
135
return 0;
136
}
137
}
138
139
char *cmdline_filename;
140
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
141
proc_entry->d_name);
142
if(ret == -1){
143
error_plus(0, errno, "asprintf");
144
return 0;
145
}
146
147
/* Open /proc/<pid>/cmdline */
148
cl_fd = open(cmdline_filename, O_RDONLY);
149
free(cmdline_filename);
150
if(cl_fd == -1){
151
if(errno != ENOENT){
152
error_plus(0, errno, "open");
153
}
154
return 0;
155
}
156
157
char *cmdline = NULL;
158
{
159
size_t cmdline_len = 0;
160
size_t cmdline_allocated = 0;
161
char *tmp;
162
const size_t blocksize = 1024;
163
ssize_t sret;
164
do {
165
/* Allocate more space? */
166
if(cmdline_len + blocksize + 1 > cmdline_allocated){
167
tmp = realloc(cmdline, cmdline_allocated + blocksize + 1);
168
if(tmp == NULL){
169
error_plus(0, errno, "realloc");
170
free(cmdline);
171
close(cl_fd);
172
return 0;
173
}
174
cmdline = tmp;
175
cmdline_allocated += blocksize;
176
}
177
178
/* Read data */
179
sret = read(cl_fd, cmdline + cmdline_len,
180
cmdline_allocated - cmdline_len);
181
if(sret == -1){
182
error_plus(0, errno, "read");
183
free(cmdline);
184
close(cl_fd);
185
return 0;
186
}
187
cmdline_len += (size_t)sret;
188
} while(sret != 0);
189
ret = close(cl_fd);
190
if(ret == -1){
191
error_plus(0, errno, "close");
192
free(cmdline);
193
return 0;
194
}
195
cmdline[cmdline_len] = '\0'; /* Make sure it is terminated */
196
}
197
/* we now have cmdline */
198
199
/* get basename */
200
char *cmdline_base = strrchr(cmdline, '/');
201
if(cmdline_base != NULL){
202
cmdline_base += 1; /* skip the slash */
203
} else {
204
cmdline_base = cmdline;
205
}
206
207
if(strcmp(cmdline_base, plymouth_name) != 0){
208
if(debug){
209
fprintf(stderr, "\"%s\" is not \"%s\"\n", cmdline_base,
210
plymouth_name);
211
}
212
free(cmdline);
213
return 0;
214
}
215
if(debug){
216
fprintf(stderr, "\"%s\" equals \"%s\"\n", cmdline_base,
217
plymouth_name);
218
}
219
free(cmdline);
220
return 1;
221
}
222
223
struct dirent **direntries = NULL;
224
int ret;
225
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
226
if(ret == -1){
227
error_plus(1, errno, "scandir");
228
}
229
{
230
int i = ret;
231
while(i--){
232
free(direntries[i]);
233
}
234
}
235
free(direntries);
236
return ret > 0;
237
}
238
239
240
69
int main(int argc, char **argv){
241
ssize_t sret;
242
int ret;
70
ssize_t ret;
243
71
size_t n;
244
72
struct termios t_new, t_old;
245
73
char *buffer = NULL;
246
74
char *prefix = NULL;
247
char *prompt = NULL;
248
75
int status = EXIT_SUCCESS;
249
76
struct sigaction old_action,
250
77
new_action = { .sa_handler = termination_handler,
254
81
{ .name = "prefix", .key = 'p',
255
82
.arg = "PREFIX", .flags = 0,
256
83
.doc = "Prefix shown before the prompt", .group = 2 },
257
{ .name = "prompt", .key = 129,
258
.arg = "PROMPT", .flags = 0,
259
.doc = "The prompt to show", .group = 2 },
260
84
{ .name = "debug", .key = 128,
261
85
.doc = "Debug mode", .group = 3 },
262
/*
263
* These reproduce what we would get without ARGP_NO_HELP
264
*/
265
{ .name = "help", .key = '?',
266
.doc = "Give this help list", .group = -1 },
267
{ .name = "usage", .key = -3,
268
.doc = "Give a short usage message", .group = -1 },
269
{ .name = "version", .key = 'V',
270
.doc = "Print program version", .group = -1 },
271
86
{ .name = NULL }
272
87
};
273
88
274
__attribute__((nonnull(3)))
275
89
error_t parse_opt (int key, char *arg, struct argp_state *state){
276
errno = 0;
277
90
switch (key){
278
case 'p': /* --prefix */
91
case 'p':
279
92
prefix = arg;
280
93
break;
281
case 128: /* --debug */
94
case 128:
282
95
debug = true;
283
96
break;
284
case 129: /* --prompt */
285
prompt = arg;
97
case ARGP_KEY_ARG:
98
argp_usage(state);
286
99
break;
287
/*
288
* These reproduce what we would get without ARGP_NO_HELP
289
*/
290
case '?': /* --help */
291
argp_state_help(state, state->out_stream,
292
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
293
& ~(unsigned int)ARGP_HELP_EXIT_OK);
294
__builtin_unreachable();
295
case -3: /* --usage */
296
argp_state_help(state, state->out_stream,
297
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
298
__builtin_unreachable();
299
case 'V': /* --version */
300
fprintf(state->out_stream, "%s\n", argp_program_version);
301
exit(argp_err_exit_status);
100
case ARGP_KEY_END:
302
101
break;
303
102
default:
304
103
return ARGP_ERR_UNKNOWN;
305
104
}
306
return errno;
105
return 0;
307
106
}
308
107
309
108
struct argp argp = { .options = options, .parser = parse_opt,
310
109
.args_doc = "",
311
110
.doc = "Mandos password-prompt -- Read and"
312
111
" output a password" };
313
ret = argp_parse(&argp, argc, argv,
314
ARGP_IN_ORDER | ARGP_NO_HELP, NULL, NULL);
315
switch(ret){
316
case 0:
317
break;
318
case ENOMEM:
319
default:
320
errno = ret;
321
error_plus(0, errno, "argp_parse");
322
return EX_OSERR;
323
case EINVAL:
324
return EX_USAGE;
112
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
113
if(ret == ARGP_ERR_UNKNOWN){
114
fprintf(stderr, "Unknown error while parsing arguments\n");
115
return EXIT_FAILURE;
325
116
}
326
117
}
327
118
328
119
if(debug){
329
120
fprintf(stderr, "Starting %s\n", argv[0]);
330
121
}
331
332
if(conflict_detection()){
333
if(debug){
334
fprintf(stderr, "Stopping %s because of conflict\n", argv[0]);
335
}
336
return EXIT_FAILURE;
337
}
338
339
122
if(debug){
340
123
fprintf(stderr, "Storing current terminal attributes\n");
341
124
}
342
125
343
126
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
344
int e = errno;
345
error_plus(0, errno, "tcgetattr");
346
switch(e){
347
case EBADF:
348
case ENOTTY:
349
return EX_UNAVAILABLE;
350
default:
351
return EX_OSERR;
352
}
127
perror("tcgetattr");
128
return EXIT_FAILURE;
353
129
}
354
130
355
131
sigemptyset(&new_action.sa_mask);
356
132
ret = sigaddset(&new_action.sa_mask, SIGINT);
357
133
if(ret == -1){
358
error_plus(0, errno, "sigaddset");
359
return EX_OSERR;
134
perror("sigaddset");
135
return EXIT_FAILURE;
360
136
}
361
137
ret = sigaddset(&new_action.sa_mask, SIGHUP);
362
138
if(ret == -1){
363
error_plus(0, errno, "sigaddset");
364
return EX_OSERR;
139
perror("sigaddset");
140
return EXIT_FAILURE;
365
141
}
366
142
ret = sigaddset(&new_action.sa_mask, SIGTERM);
367
143
if(ret == -1){
368
error_plus(0, errno, "sigaddset");
369
return EX_OSERR;
144
perror("sigaddset");
145
return EXIT_FAILURE;
370
146
}
371
147
/* Need to check if the handler is SIG_IGN before handling:
372
148
| [[info:libc:Initial Signal Actions]] |
374
150
*/
375
151
ret = sigaction(SIGINT, NULL, &old_action);
376
152
if(ret == -1){
377
error_plus(0, errno, "sigaction");
378
return EX_OSERR;
153
perror("sigaction");
154
return EXIT_FAILURE;
379
155
}
380
156
if(old_action.sa_handler != SIG_IGN){
381
157
ret = sigaction(SIGINT, &new_action, NULL);
382
158
if(ret == -1){
383
error_plus(0, errno, "sigaction");
384
return EX_OSERR;
159
perror("sigaction");
160
return EXIT_FAILURE;
385
161
}
386
162
}
387
163
ret = sigaction(SIGHUP, NULL, &old_action);
388
164
if(ret == -1){
389
error_plus(0, errno, "sigaction");
390
return EX_OSERR;
165
perror("sigaction");
166
return EXIT_FAILURE;
391
167
}
392
168
if(old_action.sa_handler != SIG_IGN){
393
169
ret = sigaction(SIGHUP, &new_action, NULL);
394
170
if(ret == -1){
395
error_plus(0, errno, "sigaction");
396
return EX_OSERR;
171
perror("sigaction");
172
return EXIT_FAILURE;
397
173
}
398
174
}
399
175
ret = sigaction(SIGTERM, NULL, &old_action);
400
176
if(ret == -1){
401
error_plus(0, errno, "sigaction");
402
return EX_OSERR;
177
perror("sigaction");
178
return EXIT_FAILURE;
403
179
}
404
180
if(old_action.sa_handler != SIG_IGN){
405
181
ret = sigaction(SIGTERM, &new_action, NULL);
406
182
if(ret == -1){
407
error_plus(0, errno, "sigaction");
408
return EX_OSERR;
183
perror("sigaction");
184
return EXIT_FAILURE;
409
185
}
410
186
}
411
187
415
191
}
416
192
417
193
t_new = t_old;
418
t_new.c_lflag &= ~(tcflag_t)ECHO;
194
t_new.c_lflag &= ~ECHO;
419
195
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
420
int e = errno;
421
error_plus(0, errno, "tcsetattr-echo");
422
switch(e){
423
case EBADF:
424
case ENOTTY:
425
return EX_UNAVAILABLE;
426
case EINVAL:
427
default:
428
return EX_OSERR;
429
}
196
perror("tcsetattr-echo");
197
return EXIT_FAILURE;
430
198
}
431
199
432
200
if(debug){
433
201
fprintf(stderr, "Waiting for input from stdin \n");
434
202
}
444
212
if(prefix){
445
213
fprintf(stderr, "%s ", prefix);
446
214
}
447
if(prompt != NULL){
448
fprintf(stderr, "%s: ", prompt);
449
} else {
450
const char *cryptsource = getenv("CRYPTTAB_SOURCE");
451
const char *crypttarget = getenv("CRYPTTAB_NAME");
452
/* Before cryptsetup 1.1.0~rc2 */
453
if(cryptsource == NULL){
454
cryptsource = getenv("cryptsource");
455
}
456
if(crypttarget == NULL){
457
crypttarget = getenv("crypttarget");
458
}
459
const char *const prompt1 = "Unlocking the disk";
460
const char *const prompt2 = "Enter passphrase";
215
{
216
const char *cryptsource = getenv("cryptsource");
217
const char *crypttarget = getenv("crypttarget");
218
const char *const prompt
219
= "Enter passphrase to unlock the disk";
461
220
if(cryptsource == NULL){
462
221
if(crypttarget == NULL){
463
fprintf(stderr, "%s to unlock the disk: ", prompt2);
222
fprintf(stderr, "%s: ", prompt);
464
223
} else {
465
fprintf(stderr, "%s (%s)\n%s: ", prompt1, crypttarget,
466
prompt2);
224
fprintf(stderr, "%s (%s): ", prompt, crypttarget);
467
225
}
468
226
} else {
469
227
if(crypttarget == NULL){
470
fprintf(stderr, "%s %s\n%s: ", prompt1, cryptsource,
471
prompt2);
228
fprintf(stderr, "%s %s: ", prompt, cryptsource);
472
229
} else {
473
fprintf(stderr, "%s %s (%s)\n%s: ", prompt1, cryptsource,
474
crypttarget, prompt2);
230
fprintf(stderr, "%s %s (%s): ", prompt, cryptsource,
231
crypttarget);
475
232
}
476
233
}
477
234
}
478
sret = getline(&buffer, &n, stdin);
479
if(sret > 0){
235
ret = getline(&buffer, &n, stdin);
236
if(ret > 0){
480
237
status = EXIT_SUCCESS;
481
238
/* Make n = data size instead of allocated buffer size */
482
n = (size_t)sret;
239
n = (size_t)ret;
483
240
/* Strip final newline */
484
if(n > 0 and buffer[n-1] == '\n'){
241
if(n>0 and buffer[n-1] == '\n'){
485
242
buffer[n-1] = '\0'; /* not strictly necessary */
486
243
n--;
487
244
}
488
245
size_t written = 0;
489
246
while(written < n){
490
sret = write(STDOUT_FILENO, buffer + written, n - written);
491
if(sret < 0){
492
int e = errno;
493
error_plus(0, errno, "write");
494
switch(e){
495
case EBADF:
496
case EFAULT:
497
case EINVAL:
498
case EFBIG:
499
case EIO:
500
case ENOSPC:
501
default:
502
status = EX_IOERR;
503
break;
504
case EINTR:
505
status = EXIT_FAILURE;
506
break;
507
}
508
break;
509
}
510
written += (size_t)sret;
511
}
512
sret = close(STDOUT_FILENO);
513
if(sret == -1){
514
int e = errno;
515
error_plus(0, errno, "close");
516
switch(e){
517
case EBADF:
518
status = EX_OSFILE;
519
break;
520
case EIO:
521
default:
522
status = EX_IOERR;
523
break;
524
}
247
ret = write(STDOUT_FILENO, buffer + written, n - written);
248
if(ret < 0){
249
perror("write");
250
status = EXIT_FAILURE;
251
break;
252
}
253
written += (size_t)ret;
525
254
}
526
255
break;
527
256
}
528
if(sret < 0){
529
int e = errno;
530
if(errno != EINTR){
531
if(not feof(stdin)){
532
error_plus(0, errno, "getline");
533
switch(e){
534
case EBADF:
535
status = EX_UNAVAILABLE;
536
break;
537
case EIO:
538
case EINVAL:
539
default:
540
status = EX_IOERR;
541
break;
542
}
543
break;
544
} else {
545
clearerr(stdin);
546
}
257
if(ret < 0){
258
if(errno != EINTR and not feof(stdin)){
259
perror("getline");
260
status = EXIT_FAILURE;
261
break;
547
262
}
548
263
}
549
/* if(sret == 0), then the only sensible thing to do is to retry
550
to read from stdin */
264
/* if(ret == 0), then the only sensible thing to do is to retry to
265
read from stdin */
551
266
fputc('\n', stderr);
552
267
if(debug and not quit_now){
553
268
/* If quit_now is nonzero, we were interrupted by a signal, and
562
277
fprintf(stderr, "Restoring terminal attributes\n");
563
278
}
564
279
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
565
error_plus(0, errno, "tcsetattr+echo");
280
perror("tcsetattr+echo");
566
281
}
567
282
568
283
if(quit_now){
570
285
old_action.sa_handler = SIG_DFL;
571
286
ret = sigaction(signal_received, &old_action, NULL);
572
287
if(ret == -1){
573
error_plus(0, errno, "sigaction");
288
perror("sigaction");
574
289
}
575
290
raise(signal_received);
576
291
}
579
294
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
580
295
status);
581
296
}
582
if(status == EXIT_SUCCESS or status == EX_OK){
297
if(status == EXIT_SUCCESS){
583
298
fputc('\n', stderr);
584
299
}
585
300
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0