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- Committer: Teddy Hogeborn
- Date: 2009-08-30 03:10:29 UTC
- Revision ID: teddy@fukt.bsnet.se-20090830031029-cj8po3rc4g1cux1d
* mandos: White-space fixes only.
* mandos-ctl: - '' -
* plugin-runner.c: - '' -
* plugins.d/askpass-fifo.c: - '' -
* plugins.d/mandos-client.c: - '' -
* plugins.d/password-prompt.c: - '' -
* mandos-ctl: - '' -
* plugin-runner.c: - '' -
* plugins.d/askpass-fifo.c: - '' -
* plugins.d/mandos-client.c: - '' -
* plugins.d/password-prompt.c: - '' -
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- ca.pem
- files renamed:
- server.py => mandos
- server.conf => mandos.conf
- plugbasedclient.c => plugin-runner.c
- plugins.d/mandosclient.c => plugins.d/mandos-client.c
- plugins.d/passprompt.c => plugins.d/password-prompt.c
- files modified:
- Makefile
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
6
7
*
7
8
* This program is free software: you can redistribute it and/or
8
9
* modify it under the terms of the GNU General Public License as
21
22
* Contact the authors at <mandos@fukt.bsnet.se>.
22
23
*/
23
24
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
26
#include <stdio.h> /* popen(), fileno(), fprintf(),
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf() */
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
27
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
stat, waitpid(), WIFEXITED(),
35
WEXITSTATUS(), wait(), pid_t,
36
uid_t, gid_t, getuid(), getgid(),
37
dirfd() */
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
FD_SET(), FD_ISSET(), FD_CLR */
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS() */
42
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
28
43
#include <iso646.h> /* and, or, not */
29
#include <sys/types.h> /* DIR, opendir(), stat(),
30
struct stat, waitpid(),
31
WIFEXITED(), WEXITSTATUS(),
32
wait() */
33
#include <sys/wait.h> /* wait() */
34
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
35
readdir(), closedir() */
36
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
45
readdir(), closedir(), dirfd() */
37
46
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
38
fcntl() */
39
#include <fcntl.h> /* fcntl() */
40
#include <stddef.h> /* NULL */
41
#include <stdlib.h> /* EXIT_FAILURE */
42
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
43
FD_SET(), FD_ISSET() */
44
#include <string.h> /* strlen(), strcpy(), strcat() */
45
#include <stdbool.h> /* true */
46
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
47
WEXITSTATUS() */
47
fcntl(), setuid(), setgid(),
48
F_GETFD, F_SETFD, FD_CLOEXEC,
49
access(), pipe(), fork(), close()
50
dup2(), STDOUT_FILENO, _exit(),
51
execv(), write(), read(),
52
close() */
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
54
FD_CLOEXEC */
55
#include <string.h> /* strsep, strlen(), asprintf() */
48
56
#include <errno.h> /* errno */
49
#include <argp.h> /* struct argp_option,
50
struct argp_state, struct argp,
51
argp_parse() */
57
#include <argp.h> /* struct argp_option, struct
58
argp_state, struct argp,
59
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG,
61
error_t */
62
#include <signal.h> /* struct sigaction, sigemptyset(),
63
sigaddset(), sigaction(),
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
SIG_UNBLOCK, kill(), sig_atomic_t
66
*/
67
#include <errno.h> /* errno, EBADF */
68
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
52
69
53
70
#define BUFFER_SIZE 256
54
71
55
struct process;
56
57
typedef struct process{
72
#define PDIR "/lib/mandos/plugins.d"
73
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
74
75
const char *argp_program_version = "plugin-runner " VERSION;
76
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
77
78
typedef struct plugin{
79
char *name; /* can be NULL or any plugin name */
80
char **argv;
81
int argc;
82
char **environ;
83
int envc;
84
bool disabled;
85
86
/* Variables used for running processes*/
58
87
pid_t pid;
59
88
int fd;
60
89
char *buffer;
61
90
size_t buffer_size;
62
91
size_t buffer_length;
63
92
bool eof;
64
bool completed;
93
volatile sig_atomic_t completed;
65
94
int status;
66
struct process *next;
67
} process;
68
69
typedef struct plugin{
70
char *name; /* can be NULL or any plugin name */
71
char **argv;
72
int argc;
73
bool disabled;
74
95
struct plugin *next;
75
96
} plugin;
76
97
77
static plugin *getplugin(char *name, plugin **plugin_list){
78
for (plugin *p = *plugin_list; p != NULL; p = p->next){
79
if ((p->name == name)
80
or (p->name and name and (strcmp(p->name, name) == 0))){
98
static plugin *plugin_list = NULL;
99
100
/* Gets an existing plugin based on name,
101
or if none is found, creates a new one */
102
static plugin *getplugin(char *name){
103
/* Check for exiting plugin with that name */
104
for(plugin *p = plugin_list; p != NULL; p = p->next){
105
if((p->name == name)
106
or (p->name and name and (strcmp(p->name, name) == 0))){
81
107
return p;
82
108
}
83
109
}
84
110
/* Create a new plugin */
85
111
plugin *new_plugin = malloc(sizeof(plugin));
86
if (new_plugin == NULL){
87
perror("malloc");
88
exit(EXIT_FAILURE);
89
}
90
new_plugin->name = name;
112
if(new_plugin == NULL){
113
return NULL;
114
}
115
char *copy_name = NULL;
116
if(name != NULL){
117
copy_name = strdup(name);
118
if(copy_name == NULL){
119
free(new_plugin);
120
return NULL;
121
}
122
}
123
124
*new_plugin = (plugin){ .name = copy_name,
125
.argc = 1,
126
.disabled = false,
127
.next = plugin_list };
128
91
129
new_plugin->argv = malloc(sizeof(char *) * 2);
92
if (new_plugin->argv == NULL){
93
perror("malloc");
94
exit(EXIT_FAILURE);
130
if(new_plugin->argv == NULL){
131
free(copy_name);
132
free(new_plugin);
133
return NULL;
95
134
}
96
new_plugin->argv[0] = name;
135
new_plugin->argv[0] = copy_name;
97
136
new_plugin->argv[1] = NULL;
98
new_plugin->argc = 1;
99
new_plugin->disabled = false;
100
new_plugin->next = *plugin_list;
137
138
new_plugin->environ = malloc(sizeof(char *));
139
if(new_plugin->environ == NULL){
140
free(copy_name);
141
free(new_plugin->argv);
142
free(new_plugin);
143
return NULL;
144
}
145
new_plugin->environ[0] = NULL;
146
101
147
/* Append the new plugin to the list */
102
*plugin_list = new_plugin;
148
plugin_list = new_plugin;
103
149
return new_plugin;
104
150
}
105
151
106
static void addargument(plugin *p, char *arg){
107
p->argv[p->argc] = arg;
108
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
109
if (p->argv == NULL){
110
perror("malloc");
111
exit(EXIT_FAILURE);
112
}
113
p->argc++;
114
p->argv[p->argc] = NULL;
152
/* Helper function for add_argument and add_environment */
153
static bool add_to_char_array(const char *new, char ***array,
154
int *len){
155
/* Resize the pointed-to array to hold one more pointer */
156
*array = realloc(*array, sizeof(char *)
157
* (size_t) ((*len) + 2));
158
/* Malloc check */
159
if(*array == NULL){
160
return false;
161
}
162
/* Make a copy of the new string */
163
char *copy = strdup(new);
164
if(copy == NULL){
165
return false;
166
}
167
/* Insert the copy */
168
(*array)[*len] = copy;
169
(*len)++;
170
/* Add a new terminating NULL pointer to the last element */
171
(*array)[*len] = NULL;
172
return true;
173
}
174
175
/* Add to a plugin's argument vector */
176
static bool add_argument(plugin *p, const char *arg){
177
if(p == NULL){
178
return false;
179
}
180
return add_to_char_array(arg, &(p->argv), &(p->argc));
181
}
182
183
/* Add to a plugin's environment */
184
static bool add_environment(plugin *p, const char *def, bool replace){
185
if(p == NULL){
186
return false;
187
}
188
/* namelen = length of name of environment variable */
189
size_t namelen = (size_t)(strchrnul(def, '=') - def);
190
/* Search for this environment variable */
191
for(char **e = p->environ; *e != NULL; e++){
192
if(strncmp(*e, def, namelen + 1) == 0){
193
/* It already exists */
194
if(replace){
195
char *new = realloc(*e, strlen(def) + 1);
196
if(new == NULL){
197
return false;
198
}
199
*e = new;
200
strcpy(*e, def);
201
}
202
return true;
203
}
204
}
205
return add_to_char_array(def, &(p->environ), &(p->envc));
115
206
}
116
207
117
208
/*
119
210
* Descriptor Flags".
120
211
* *Note File Descriptor Flags:(libc)Descriptor Flags.
121
212
*/
122
static int set_cloexec_flag(int fd)
123
{
213
static int set_cloexec_flag(int fd){
124
214
int ret = fcntl(fd, F_GETFD, 0);
125
215
/* If reading the flags failed, return error indication now. */
126
216
if(ret < 0){
130
220
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
131
221
}
132
222
133
const char *argp_program_version = "plugbasedclient 0.9";
134
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
135
136
process *process_list = NULL;
137
138
/* Mark a process as completed when it exits, and save its exit
223
224
/* Mark processes as completed when they exit, and save their exit
139
225
status. */
140
void handle_sigchld(__attribute__((unused)) int sig){
141
process *proc = process_list;
142
int status;
143
pid_t pid = wait(&status);
144
while(proc != NULL and proc->pid != pid){
145
proc = proc->next;
146
}
147
if(proc == NULL){
148
/* Process not found in process list */
149
return;
150
}
151
proc->status = status;
152
proc->completed = true;
226
static void handle_sigchld(__attribute__((unused)) int sig){
227
int old_errno = errno;
228
while(true){
229
plugin *proc = plugin_list;
230
int status;
231
pid_t pid = waitpid(-1, &status, WNOHANG);
232
if(pid == 0){
233
/* Only still running child processes */
234
break;
235
}
236
if(pid == -1){
237
if(errno == ECHILD){
238
/* No child processes */
239
break;
240
}
241
perror("waitpid");
242
}
243
244
/* A child exited, find it in process_list */
245
while(proc != NULL and proc->pid != pid){
246
proc = proc->next;
247
}
248
if(proc == NULL){
249
/* Process not found in process list */
250
continue;
251
}
252
proc->status = status;
253
proc->completed = 1;
254
}
255
errno = old_errno;
256
}
257
258
/* Prints out a password to stdout */
259
static bool print_out_password(const char *buffer, size_t length){
260
ssize_t ret;
261
for(size_t written = 0; written < length; written += (size_t)ret){
262
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
263
length - written));
264
if(ret < 0){
265
return false;
266
}
267
}
268
return true;
269
}
270
271
/* Removes and free a plugin from the plugin list */
272
static void free_plugin(plugin *plugin_node){
273
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
275
free(*arg);
276
}
277
free(plugin_node->argv);
278
for(char **env = plugin_node->environ; *env != NULL; env++){
279
free(*env);
280
}
281
free(plugin_node->environ);
282
free(plugin_node->buffer);
283
284
/* Removes the plugin from the singly-linked list */
285
if(plugin_node == plugin_list){
286
/* First one - simple */
287
plugin_list = plugin_list->next;
288
} else {
289
/* Second one or later */
290
for(plugin *p = plugin_list; p != NULL; p = p->next){
291
if(p->next == plugin_node){
292
p->next = plugin_node->next;
293
break;
294
}
295
}
296
}
297
298
free(plugin_node);
299
}
300
301
static void free_plugin_list(void){
302
while(plugin_list != NULL){
303
free_plugin(plugin_list);
304
}
153
305
}
154
306
155
307
int main(int argc, char *argv[]){
156
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
308
char *plugindir = NULL;
309
char *argfile = NULL;
310
FILE *conffp;
157
311
size_t d_name_len;
158
312
DIR *dir = NULL;
159
313
struct dirent *dirst;
160
314
struct stat st;
161
315
fd_set rfds_all;
162
316
int ret, maxfd = 0;
317
ssize_t sret;
318
intmax_t tmpmax;
163
319
uid_t uid = 65534;
164
320
gid_t gid = 65534;
165
321
bool debug = false;
167
323
struct sigaction old_sigchld_action;
168
324
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
169
325
.sa_flags = SA_NOCLDSTOP };
170
char *plus_options = NULL;
171
char **plus_argv = NULL;
326
char **custom_argv = NULL;
327
int custom_argc = 0;
172
328
173
329
/* Establish a signal handler */
174
330
sigemptyset(&sigchld_action.sa_mask);
175
331
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
176
if(ret < 0){
332
if(ret == -1){
177
333
perror("sigaddset");
178
exit(EXIT_FAILURE);
334
exitstatus = EXIT_FAILURE;
335
goto fallback;
179
336
}
180
337
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
181
if(ret < 0){
338
if(ret == -1){
182
339
perror("sigaction");
183
exit(EXIT_FAILURE);
340
exitstatus = EXIT_FAILURE;
341
goto fallback;
184
342
}
185
343
186
344
/* The options we understand. */
188
346
{ .name = "global-options", .key = 'g',
189
347
.arg = "OPTION[,OPTION[,...]]",
190
348
.doc = "Options passed to all plugins" },
349
{ .name = "global-env", .key = 'G',
350
.arg = "VAR=value",
351
.doc = "Environment variable passed to all plugins" },
191
352
{ .name = "options-for", .key = 'o',
192
353
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
193
354
.doc = "Options passed only to specified plugin" },
355
{ .name = "env-for", .key = 'E',
356
.arg = "PLUGIN:ENV=value",
357
.doc = "Environment variable passed to specified plugin" },
194
358
{ .name = "disable", .key = 'd',
195
359
.arg = "PLUGIN",
196
360
.doc = "Disable a specific plugin", .group = 1 },
361
{ .name = "enable", .key = 'e',
362
.arg = "PLUGIN",
363
.doc = "Enable a specific plugin", .group = 1 },
197
364
{ .name = "plugin-dir", .key = 128,
198
365
.arg = "DIRECTORY",
199
366
.doc = "Specify a different plugin directory", .group = 2 },
200
{ .name = "userid", .key = 129,
201
.arg = "ID", .flags = 0,
202
.doc = "User ID the plugins will run as", .group = 2 },
203
{ .name = "groupid", .key = 130,
204
.arg = "ID", .flags = 0,
205
.doc = "Group ID the plugins will run as", .group = 2 },
206
{ .name = "debug", .key = 131,
207
.doc = "Debug mode", .group = 3 },
367
{ .name = "config-file", .key = 129,
368
.arg = "FILE",
369
.doc = "Specify a different configuration file", .group = 2 },
370
{ .name = "userid", .key = 130,
371
.arg = "ID", .flags = 0,
372
.doc = "User ID the plugins will run as", .group = 3 },
373
{ .name = "groupid", .key = 131,
374
.arg = "ID", .flags = 0,
375
.doc = "Group ID the plugins will run as", .group = 3 },
376
{ .name = "debug", .key = 132,
377
.doc = "Debug mode", .group = 4 },
208
378
{ .name = NULL }
209
379
};
210
380
211
error_t parse_opt (int key, char *arg, struct argp_state *state) {
212
/* Get the INPUT argument from `argp_parse', which we know is a
213
pointer to our plugin list pointer. */
214
plugin **plugins = state->input;
215
switch (key) {
216
case 'g':
217
if (arg != NULL){
218
char *p = strtok(arg, ",");
219
do{
220
addargument(getplugin(NULL, plugins), p);
221
p = strtok(NULL, ",");
222
} while (p != NULL);
223
}
224
break;
225
case 'o':
226
if (arg != NULL){
227
char *name = strtok(arg, ":");
228
char *p = strtok(NULL, ":");
229
if(p != NULL){
230
p = strtok(p, ",");
231
do{
232
addargument(getplugin(name, plugins), p);
233
p = strtok(NULL, ",");
234
} while (p != NULL);
235
}
236
}
237
break;
238
case 'd':
239
if (arg != NULL){
240
getplugin(arg, plugins)->disabled = true;
241
}
242
break;
243
case 128:
244
plugindir = arg;
245
break;
246
case 129:
247
uid = (uid_t)strtol(arg, NULL, 10);
248
break;
249
case 130:
250
gid = (gid_t)strtol(arg, NULL, 10);
251
break;
252
case 131:
381
error_t parse_opt(int key, char *arg, __attribute__((unused))
382
struct argp_state *state){
383
char *tmp;
384
switch(key){
385
case 'g': /* --global-options */
386
if(arg != NULL){
387
char *plugin_option;
388
while((plugin_option = strsep(&arg, ",")) != NULL){
389
if(plugin_option[0] == '\0'){
390
continue;
391
}
392
if(not add_argument(getplugin(NULL), plugin_option)){
393
perror("add_argument");
394
return ARGP_ERR_UNKNOWN;
395
}
396
}
397
}
398
break;
399
case 'G': /* --global-env */
400
if(arg == NULL){
401
break;
402
}
403
if(not add_environment(getplugin(NULL), arg, true)){
404
perror("add_environment");
405
}
406
break;
407
case 'o': /* --options-for */
408
if(arg != NULL){
409
char *plugin_name = strsep(&arg, ":");
410
if(plugin_name[0] == '\0'){
411
break;
412
}
413
char *plugin_option;
414
while((plugin_option = strsep(&arg, ",")) != NULL){
415
if(not add_argument(getplugin(plugin_name), plugin_option)){
416
perror("add_argument");
417
return ARGP_ERR_UNKNOWN;
418
}
419
}
420
}
421
break;
422
case 'E': /* --env-for */
423
if(arg == NULL){
424
break;
425
}
426
{
427
char *envdef = strchr(arg, ':');
428
if(envdef == NULL){
429
break;
430
}
431
*envdef = '\0';
432
if(not add_environment(getplugin(arg), envdef+1, true)){
433
perror("add_environment");
434
}
435
}
436
break;
437
case 'd': /* --disable */
438
if(arg != NULL){
439
plugin *p = getplugin(arg);
440
if(p == NULL){
441
return ARGP_ERR_UNKNOWN;
442
}
443
p->disabled = true;
444
}
445
break;
446
case 'e': /* --enable */
447
if(arg != NULL){
448
plugin *p = getplugin(arg);
449
if(p == NULL){
450
return ARGP_ERR_UNKNOWN;
451
}
452
p->disabled = false;
453
}
454
break;
455
case 128: /* --plugin-dir */
456
free(plugindir);
457
plugindir = strdup(arg);
458
if(plugindir == NULL){
459
perror("strdup");
460
}
461
break;
462
case 129: /* --config-file */
463
/* This is already done by parse_opt_config_file() */
464
break;
465
case 130: /* --userid */
466
errno = 0;
467
tmpmax = strtoimax(arg, &tmp, 10);
468
if(errno != 0 or tmp == arg or *tmp != '\0'
469
or tmpmax != (uid_t)tmpmax){
470
fprintf(stderr, "Bad user ID number: \"%s\", using %"
471
PRIdMAX "\n", arg, (intmax_t)uid);
472
} else {
473
uid = (uid_t)tmpmax;
474
}
475
break;
476
case 131: /* --groupid */
477
errno = 0;
478
tmpmax = strtoimax(arg, &tmp, 10);
479
if(errno != 0 or tmp == arg or *tmp != '\0'
480
or tmpmax != (gid_t)tmpmax){
481
fprintf(stderr, "Bad group ID number: \"%s\", using %"
482
PRIdMAX "\n", arg, (intmax_t)gid);
483
} else {
484
gid = (gid_t)tmpmax;
485
}
486
break;
487
case 132: /* --debug */
253
488
debug = true;
254
489
break;
255
case ARGP_KEY_ARG:
256
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
257
argp_usage (state);
258
}
259
plus_options = arg;
260
break;
261
case ARGP_KEY_END:
262
break;
263
default:
264
return ARGP_ERR_UNKNOWN;
265
}
266
return 0;
267
}
268
269
plugin *plugin_list = NULL;
270
271
struct argp argp = { .options = options, .parser = parse_opt,
272
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
490
/*
491
* When adding more options before this line, remember to also add a
492
* "case" to the "parse_opt_config_file" function below.
493
*/
494
case ARGP_KEY_ARG:
495
/* Cryptsetup always passes an argument, which is an empty
496
string if "none" was specified in /etc/crypttab. So if
497
argument was empty, we ignore it silently. */
498
if(arg[0] != '\0'){
499
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
500
}
501
break;
502
case ARGP_KEY_END:
503
break;
504
default:
505
return ARGP_ERR_UNKNOWN;
506
}
507
return 0;
508
}
509
510
/* This option parser is the same as parse_opt() above, except it
511
ignores everything but the --config-file option. */
512
error_t parse_opt_config_file(int key, char *arg,
513
__attribute__((unused))
514
struct argp_state *state){
515
switch(key){
516
case 'g': /* --global-options */
517
case 'G': /* --global-env */
518
case 'o': /* --options-for */
519
case 'E': /* --env-for */
520
case 'd': /* --disable */
521
case 'e': /* --enable */
522
case 128: /* --plugin-dir */
523
break;
524
case 129: /* --config-file */
525
free(argfile);
526
argfile = strdup(arg);
527
if(argfile == NULL){
528
perror("strdup");
529
}
530
break;
531
case 130: /* --userid */
532
case 131: /* --groupid */
533
case 132: /* --debug */
534
case ARGP_KEY_ARG:
535
case ARGP_KEY_END:
536
break;
537
default:
538
return ARGP_ERR_UNKNOWN;
539
}
540
return 0;
541
}
542
543
struct argp argp = { .options = options,
544
.parser = parse_opt_config_file,
545
.args_doc = "",
273
546
.doc = "Mandos plugin runner -- Run plugins" };
274
547
275
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
276
277
if(plus_options){
278
/* This is a mangled argument in the form of
279
"+--option+--other-option=parameter+--yet-another-option", etc */
280
/* Make new argc and argv vars, and call argp_parse() again. */
281
plus_options++; /* skip the first '+' character */
282
const char delims[] = "+";
283
char *arg;
284
int new_argc = 1;
285
plus_argv = malloc(sizeof(char*) * 2);
286
if(plus_argv == NULL){
548
/* Parse using parse_opt_config_file() in order to get the custom
549
config file location, if any. */
550
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
551
if(ret == ARGP_ERR_UNKNOWN){
552
fprintf(stderr, "Unknown error while parsing arguments\n");
553
exitstatus = EXIT_FAILURE;
554
goto fallback;
555
}
556
557
/* Reset to the normal argument parser */
558
argp.parser = parse_opt;
559
560
/* Open the configfile if available */
561
if(argfile == NULL){
562
conffp = fopen(AFILE, "r");
563
} else {
564
conffp = fopen(argfile, "r");
565
}
566
if(conffp != NULL){
567
char *org_line = NULL;
568
char *p, *arg, *new_arg, *line;
569
size_t size = 0;
570
const char whitespace_delims[] = " \r\t\f\v\n";
571
const char comment_delim[] = "#";
572
573
custom_argc = 1;
574
custom_argv = malloc(sizeof(char*) * 2);
575
if(custom_argv == NULL){
287
576
perror("malloc");
288
577
exitstatus = EXIT_FAILURE;
289
goto end;
290
}
291
plus_argv[0] = argv[0];
292
plus_argv[1] = NULL;
293
arg = strtok(plus_options, delims); /* Get first argument */
294
while(arg != NULL){
295
new_argc++;
296
plus_argv = realloc(plus_argv, sizeof(char *)
297
* ((unsigned int) new_argc + 1));
298
if(plus_argv == NULL){
299
perror("malloc");
300
exitstatus = EXIT_FAILURE;
301
goto end;
302
}
303
plus_argv[new_argc-1] = arg;
304
plus_argv[new_argc] = NULL;
305
arg = strtok(NULL, delims); /* Get next argument */
306
}
307
argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
578
goto fallback;
579
}
580
custom_argv[0] = argv[0];
581
custom_argv[1] = NULL;
582
583
/* for each line in the config file, strip whitespace and ignore
584
commented text */
585
while(true){
586
sret = getline(&org_line, &size, conffp);
587
if(sret == -1){
588
break;
589
}
590
591
line = org_line;
592
arg = strsep(&line, comment_delim);
593
while((p = strsep(&arg, whitespace_delims)) != NULL){
594
if(p[0] == '\0'){
595
continue;
596
}
597
new_arg = strdup(p);
598
if(new_arg == NULL){
599
perror("strdup");
600
exitstatus = EXIT_FAILURE;
601
free(org_line);
602
goto fallback;
603
}
604
605
custom_argc += 1;
606
custom_argv = realloc(custom_argv, sizeof(char *)
607
* ((unsigned int) custom_argc + 1));
608
if(custom_argv == NULL){
609
perror("realloc");
610
exitstatus = EXIT_FAILURE;
611
free(org_line);
612
goto fallback;
613
}
614
custom_argv[custom_argc-1] = new_arg;
615
custom_argv[custom_argc] = NULL;
616
}
617
}
618
free(org_line);
619
} else {
620
/* Check for harmful errors and go to fallback. Other errors might
621
not affect opening plugins */
622
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
623
perror("fopen");
624
exitstatus = EXIT_FAILURE;
625
goto fallback;
626
}
627
}
628
/* If there was any arguments from configuration file,
629
pass them to parser as command arguments */
630
if(custom_argv != NULL){
631
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
632
0, NULL);
633
if(ret == ARGP_ERR_UNKNOWN){
634
fprintf(stderr, "Unknown error while parsing arguments\n");
635
exitstatus = EXIT_FAILURE;
636
goto fallback;
637
}
638
}
639
640
/* Parse actual command line arguments, to let them override the
641
config file */
642
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
643
if(ret == ARGP_ERR_UNKNOWN){
644
fprintf(stderr, "Unknown error while parsing arguments\n");
645
exitstatus = EXIT_FAILURE;
646
goto fallback;
308
647
}
309
648
310
649
if(debug){
314
653
for(char **a = p->argv; *a != NULL; a++){
315
654
fprintf(stderr, "\tArg: %s\n", *a);
316
655
}
656
fprintf(stderr, "...and %d environment variables\n", p->envc);
657
for(char **a = p->environ; *a != NULL; a++){
658
fprintf(stderr, "\t%s\n", *a);
659
}
317
660
}
318
661
}
319
662
663
/* Strip permissions down to nobody */
664
setgid(gid);
665
if(ret == -1){
666
perror("setgid");
667
}
320
668
ret = setuid(uid);
321
if (ret == -1){
669
if(ret == -1){
322
670
perror("setuid");
323
671
}
324
672
325
setgid(gid);
326
if (ret == -1){
327
perror("setgid");
673
if(plugindir == NULL){
674
dir = opendir(PDIR);
675
} else {
676
dir = opendir(plugindir);
328
677
}
329
678
330
dir = opendir(plugindir);
331
679
if(dir == NULL){
332
680
perror("Could not open plugin dir");
333
681
exitstatus = EXIT_FAILURE;
334
goto end;
682
goto fallback;
335
683
}
336
684
337
685
/* Set the FD_CLOEXEC flag on the directory, if possible */
342
690
if(ret < 0){
343
691
perror("set_cloexec_flag");
344
692
exitstatus = EXIT_FAILURE;
345
goto end;
693
goto fallback;
346
694
}
347
695
}
348
696
}
349
697
350
698
FD_ZERO(&rfds_all);
351
699
700
/* Read and execute any executable in the plugin directory*/
352
701
while(true){
353
702
dirst = readdir(dir);
354
703
355
// All directory entries have been processed
704
/* All directory entries have been processed */
356
705
if(dirst == NULL){
706
if(errno == EBADF){
707
perror("readdir");
708
exitstatus = EXIT_FAILURE;
709
goto fallback;
710
}
357
711
break;
358
712
}
359
713
360
714
d_name_len = strlen(dirst->d_name);
361
715
362
// Ignore dotfiles, backup files and other junk
716
/* Ignore dotfiles, backup files and other junk */
363
717
{
364
718
bool bad_name = false;
365
719
367
721
368
722
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
369
723
".dpkg-old",
724
".dpkg-bak",
370
725
".dpkg-divert", NULL };
371
726
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
372
727
size_t pre_len = strlen(*pre);
380
735
break;
381
736
}
382
737
}
383
384
738
if(bad_name){
385
739
continue;
386
740
}
387
388
741
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
389
742
size_t suf_len = strlen(*suf);
390
743
if((d_name_len >= suf_len)
404
757
}
405
758
}
406
759
407
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
408
if (filename == NULL){
409
perror("malloc");
410
exitstatus = EXIT_FAILURE;
411
goto end;
412
}
413
strcpy(filename, plugindir); /* Spurious warning */
414
strcat(filename, "/"); /* Spurious warning */
415
strcat(filename, dirst->d_name); /* Spurious warning */
416
417
stat(filename, &st);
418
419
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
760
char *filename;
761
if(plugindir == NULL){
762
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
763
} else {
764
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
765
}
766
if(ret < 0){
767
perror("asprintf");
768
continue;
769
}
770
771
ret = stat(filename, &st);
772
if(ret == -1){
773
perror("stat");
774
free(filename);
775
continue;
776
}
777
778
/* Ignore non-executable files */
779
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
420
780
if(debug){
421
781
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
422
782
" with bad type or mode\n", filename);
424
784
free(filename);
425
785
continue;
426
786
}
427
if(getplugin(dirst->d_name, &plugin_list)->disabled){
787
788
plugin *p = getplugin(dirst->d_name);
789
if(p == NULL){
790
perror("getplugin");
791
free(filename);
792
continue;
793
}
794
if(p->disabled){
428
795
if(debug){
429
796
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
430
797
dirst->d_name);
432
799
free(filename);
433
800
continue;
434
801
}
435
plugin *p = getplugin(dirst->d_name, &plugin_list);
436
802
{
437
803
/* Add global arguments to argument list for this plugin */
438
plugin *g = getplugin(NULL, &plugin_list);
439
for(char **a = g->argv + 1; *a != NULL; a++){
440
addargument(p, *a);
441
}
442
}
443
int pipefd[2];
804
plugin *g = getplugin(NULL);
805
if(g != NULL){
806
for(char **a = g->argv + 1; *a != NULL; a++){
807
if(not add_argument(p, *a)){
808
perror("add_argument");
809
}
810
}
811
/* Add global environment variables */
812
for(char **e = g->environ; *e != NULL; e++){
813
if(not add_environment(p, *e, false)){
814
perror("add_environment");
815
}
816
}
817
}
818
}
819
/* If this plugin has any environment variables, we will call
820
using execve and need to duplicate the environment from this
821
process, too. */
822
if(p->environ[0] != NULL){
823
for(char **e = environ; *e != NULL; e++){
824
if(not add_environment(p, *e, false)){
825
perror("add_environment");
826
}
827
}
828
}
829
830
int pipefd[2];
444
831
ret = pipe(pipefd);
445
if (ret == -1){
832
if(ret == -1){
446
833
perror("pipe");
447
834
exitstatus = EXIT_FAILURE;
448
goto end;
835
goto fallback;
449
836
}
837
/* Ask OS to automatic close the pipe on exec */
450
838
ret = set_cloexec_flag(pipefd[0]);
451
839
if(ret < 0){
452
840
perror("set_cloexec_flag");
453
841
exitstatus = EXIT_FAILURE;
454
goto end;
842
goto fallback;
455
843
}
456
844
ret = set_cloexec_flag(pipefd[1]);
457
845
if(ret < 0){
458
846
perror("set_cloexec_flag");
459
847
exitstatus = EXIT_FAILURE;
460
goto end;
848
goto fallback;
461
849
}
462
850
/* Block SIGCHLD until process is safely in process list */
463
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
851
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
464
852
if(ret < 0){
465
853
perror("sigprocmask");
466
854
exitstatus = EXIT_FAILURE;
467
goto end;
855
goto fallback;
468
856
}
469
// Starting a new process to be watched
857
/* Starting a new process to be watched */
470
858
pid_t pid = fork();
859
if(pid == -1){
860
perror("fork");
861
exitstatus = EXIT_FAILURE;
862
goto fallback;
863
}
471
864
if(pid == 0){
472
865
/* this is the child process */
473
866
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
475
868
perror("sigaction");
476
869
_exit(EXIT_FAILURE);
477
870
}
478
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
871
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
479
872
if(ret < 0){
480
873
perror("sigprocmask");
481
874
_exit(EXIT_FAILURE);
482
875
}
483
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
876
877
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
878
if(ret == -1){
879
perror("dup2");
880
_exit(EXIT_FAILURE);
881
}
484
882
485
883
if(dirfd(dir) < 0){
486
884
/* If dir has no file descriptor, we could not set FD_CLOEXEC
487
885
above and must now close it manually here. */
488
886
closedir(dir);
489
887
}
490
if(execv(filename, p->argv) < 0){
491
perror("execv");
492
_exit(EXIT_FAILURE);
888
if(p->environ[0] == NULL){
889
if(execv(filename, p->argv) < 0){
890
perror("execv");
891
_exit(EXIT_FAILURE);
892
}
893
} else {
894
if(execve(filename, p->argv, p->environ) < 0){
895
perror("execve");
896
_exit(EXIT_FAILURE);
897
}
493
898
}
494
899
/* no return */
495
900
}
496
/* parent process */
901
/* Parent process */
902
close(pipefd[1]); /* Close unused write end of pipe */
497
903
free(filename);
498
close(pipefd[1]); /* close unused write end of pipe */
499
process *new_process = malloc(sizeof(process));
500
if (new_process == NULL){
501
perror("malloc");
502
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
904
plugin *new_plugin = getplugin(dirst->d_name);
905
if(new_plugin == NULL){
906
perror("getplugin");
907
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
503
908
if(ret < 0){
504
perror("sigprocmask");
909
perror("sigprocmask");
505
910
}
506
911
exitstatus = EXIT_FAILURE;
507
goto end;
912
goto fallback;
508
913
}
509
914
510
*new_process = (struct process){ .pid = pid,
511
.fd = pipefd[0],
512
.next = process_list };
513
// List handling
514
process_list = new_process;
915
new_plugin->pid = pid;
916
new_plugin->fd = pipefd[0];
917
515
918
/* Unblock SIGCHLD so signal handler can be run if this process
516
919
has already completed */
517
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
920
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
518
921
if(ret < 0){
519
922
perror("sigprocmask");
520
923
exitstatus = EXIT_FAILURE;
521
goto end;
522
}
523
524
FD_SET(new_process->fd, &rfds_all);
525
526
if (maxfd < new_process->fd){
527
maxfd = new_process->fd;
528
}
529
530
}
531
532
/* Free the plugin list */
533
for(plugin *next; plugin_list != NULL; plugin_list = next){
534
next = plugin_list->next;
535
free(plugin_list->argv);
536
free(plugin_list);
924
goto fallback;
925
}
926
927
FD_SET(new_plugin->fd, &rfds_all);
928
929
if(maxfd < new_plugin->fd){
930
maxfd = new_plugin->fd;
931
}
537
932
}
538
933
539
934
closedir(dir);
540
935
dir = NULL;
936
free_plugin(getplugin(NULL));
541
937
542
if (process_list == NULL){
543
fprintf(stderr, "No plugin processes started, exiting\n");
544
exitstatus = EXIT_FAILURE;
545
goto end;
938
for(plugin *p = plugin_list; p != NULL; p = p->next){
939
if(p->pid != 0){
940
break;
941
}
942
if(p->next == NULL){
943
fprintf(stderr, "No plugin processes started. Incorrect plugin"
944
" directory?\n");
945
free_plugin_list();
946
}
546
947
}
547
while(process_list){
948
949
/* Main loop while running plugins exist */
950
while(plugin_list){
548
951
fd_set rfds = rfds_all;
549
952
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
550
if (select_ret == -1){
953
if(select_ret == -1){
551
954
perror("select");
552
955
exitstatus = EXIT_FAILURE;
553
goto end;
956
goto fallback;
554
957
}
555
958
/* OK, now either a process completed, or something can be read
556
959
from one of them */
557
for(process *proc = process_list; proc ; proc = proc->next){
960
for(plugin *proc = plugin_list; proc != NULL;){
558
961
/* Is this process completely done? */
559
if(proc->eof and proc->completed){
962
if(proc->completed and proc->eof){
560
963
/* Only accept the plugin output if it exited cleanly */
561
964
if(not WIFEXITED(proc->status)
562
965
or WEXITSTATUS(proc->status) != 0){
563
966
/* Bad exit by plugin */
967
564
968
if(debug){
565
969
if(WIFEXITED(proc->status)){
566
fprintf(stderr, "Plugin %d exited with status %d\n",
567
proc->pid, WEXITSTATUS(proc->status));
568
} else if(WIFSIGNALED(proc->status)) {
569
fprintf(stderr, "Plugin %d killed by signal %d\n",
570
proc->pid, WTERMSIG(proc->status));
970
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
971
" status %d\n", proc->name,
972
(intmax_t) (proc->pid),
973
WEXITSTATUS(proc->status));
974
} else if(WIFSIGNALED(proc->status)){
975
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
976
" signal %d\n", proc->name,
977
(intmax_t) (proc->pid),
978
WTERMSIG(proc->status));
571
979
} else if(WCOREDUMP(proc->status)){
572
fprintf(stderr, "Plugin %d dumped core\n", proc->pid);
980
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
981
" core\n", proc->name, (intmax_t) (proc->pid));
573
982
}
574
983
}
984
575
985
/* Remove the plugin */
576
986
FD_CLR(proc->fd, &rfds_all);
987
577
988
/* Block signal while modifying process_list */
578
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
989
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
579
990
if(ret < 0){
580
991
perror("sigprocmask");
581
992
exitstatus = EXIT_FAILURE;
582
goto end;
583
}
584
/* Delete this process entry from the list */
585
if(process_list == proc){
586
/* First one - simple */
587
process_list = proc->next;
588
} else {
589
/* Second one or later */
590
for(process *p = process_list; p != NULL; p = p->next){
591
if(p->next == proc){
592
p->next = proc->next;
593
break;
594
}
595
}
596
}
993
goto fallback;
994
}
995
996
plugin *next_plugin = proc->next;
997
free_plugin(proc);
998
proc = next_plugin;
999
597
1000
/* We are done modifying process list, so unblock signal */
598
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
599
NULL);
1001
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1002
NULL);
600
1003
if(ret < 0){
601
1004
perror("sigprocmask");
602
}
603
free(proc->buffer);
604
free(proc);
605
/* We deleted this process from the list, so we can't go
606
proc->next. Therefore, start over from the beginning of
607
the process list */
608
break;
1005
exitstatus = EXIT_FAILURE;
1006
goto fallback;
1007
}
1008
1009
if(plugin_list == NULL){
1010
break;
1011
}
1012
1013
continue;
609
1014
}
1015
610
1016
/* This process exited nicely, so print its buffer */
611
for(size_t written = 0; written < proc->buffer_length;
612
written += (size_t)ret){
613
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
614
proc->buffer + written,
615
proc->buffer_length
616
- written));
617
if(ret < 0){
618
perror("write");
619
exitstatus = EXIT_FAILURE;
620
goto end;
621
}
1017
1018
bool bret = print_out_password(proc->buffer,
1019
proc->buffer_length);
1020
if(not bret){
1021
perror("print_out_password");
1022
exitstatus = EXIT_FAILURE;
622
1023
}
623
goto end;
1024
goto fallback;
624
1025
}
1026
625
1027
/* This process has not completed. Does it have any output? */
626
1028
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
627
1029
/* This process had nothing to say at this time */
1030
proc = proc->next;
628
1031
continue;
629
1032
}
630
1033
/* Before reading, make the process' data buffer large enough */
631
1034
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
632
1035
proc->buffer = realloc(proc->buffer, proc->buffer_size
633
1036
+ (size_t) BUFFER_SIZE);
634
if (proc->buffer == NULL){
1037
if(proc->buffer == NULL){
635
1038
perror("malloc");
636
1039
exitstatus = EXIT_FAILURE;
637
goto end;
1040
goto fallback;
638
1041
}
639
1042
proc->buffer_size += BUFFER_SIZE;
640
1043
}
641
1044
/* Read from the process */
642
ret = read(proc->fd, proc->buffer + proc->buffer_length,
643
BUFFER_SIZE);
644
if(ret < 0){
1045
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1046
BUFFER_SIZE);
1047
if(sret < 0){
645
1048
/* Read error from this process; ignore the error */
1049
proc = proc->next;
646
1050
continue;
647
1051
}
648
if(ret == 0){
1052
if(sret == 0){
649
1053
/* got EOF */
650
1054
proc->eof = true;
651
1055
} else {
652
proc->buffer_length += (size_t) ret;
1056
proc->buffer_length += (size_t) sret;
653
1057
}
654
1058
}
655
1059
}
656
if(process_list == NULL){
657
fprintf(stderr, "All plugin processes failed, exiting\n");
658
exitstatus = EXIT_FAILURE;
1060
1061
1062
fallback:
1063
1064
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1065
/* Fallback if all plugins failed, none are found or an error
1066
occured */
1067
bool bret;
1068
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1069
char *passwordbuffer = getpass("Password: ");
1070
size_t len = strlen(passwordbuffer);
1071
/* Strip trailing newline */
1072
if(len > 0 and passwordbuffer[len-1] == '\n'){
1073
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1074
len--;
1075
}
1076
bret = print_out_password(passwordbuffer, len);
1077
if(not bret){
1078
perror("print_out_password");
1079
exitstatus = EXIT_FAILURE;
1080
}
659
1081
}
660
1082
661
end:
662
1083
/* Restore old signal handler */
663
sigaction(SIGCHLD, &old_sigchld_action, NULL);
664
665
free(plus_argv);
666
667
/* Free the plugin list */
668
for(plugin *next; plugin_list != NULL; plugin_list = next){
669
next = plugin_list->next;
670
free(plugin_list->argv);
671
free(plugin_list);
1084
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1085
if(ret == -1){
1086
perror("sigaction");
1087
exitstatus = EXIT_FAILURE;
1088
}
1089
1090
if(custom_argv != NULL){
1091
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1092
free(*arg);
1093
}
1094
free(custom_argv);
672
1095
}
673
1096
674
1097
if(dir != NULL){
675
1098
closedir(dir);
676
1099
}
677
1100
678
/* Free the process list and kill the processes */
679
for(process *next; process_list != NULL; process_list = next){
680
next = process_list->next;
681
close(process_list->fd);
682
kill(process_list->pid, SIGTERM);
683
free(process_list->buffer);
684
free(process_list);
1101
/* Kill the processes */
1102
for(plugin *p = plugin_list; p != NULL; p = p->next){
1103
if(p->pid != 0){
1104
close(p->fd);
1105
ret = kill(p->pid, SIGTERM);
1106
if(ret == -1 and errno != ESRCH){
1107
/* Set-uid proccesses might not get closed */
1108
perror("kill");
1109
}
1110
}
685
1111
}
686
1112
687
1113
/* Wait for any remaining child processes to terminate */
692
1118
perror("wait");
693
1119
}
694
1120
1121
free_plugin_list();
1122
1123
free(plugindir);
1124
free(argfile);
1125
695
1126
return exitstatus;
696
1127
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0