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- Committer: Björn Påhlsson
- Date: 2008-08-14 01:32:34 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 75.
- Revision ID: belorn@braxen-20080814013234-qs0s608s3gxwb5t7
changed from using strtok to strsep
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugin-runner.c => mandos-client.c
- plugin-runner.xml => mandos-client.xml
- 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
mandos-client.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
7
6
*
8
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
22
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
22
*/
24
23
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf() */
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
27
26
#include <stddef.h> /* size_t, NULL */
28
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
33
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
33
stat, waitpid(), WIFEXITED(),
35
34
WEXITSTATUS(), wait(), pid_t,
38
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
38
FD_SET(), FD_ISSET(), FD_CLR */
40
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
40
WEXITSTATUS() */
43
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
42
#include <iso646.h> /* and, or, not */
45
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
48
46
fcntl(), setuid(), setgid(),
49
47
F_GETFD, F_SETFD, FD_CLOEXEC,
50
48
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
52
50
execv(), write(), read(),
53
51
close() */
54
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
53
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
54
#include <string.h> /* strsep, strlen(), strcpy(),
55
strcat() */
58
56
#include <errno.h> /* errno */
59
57
#include <argp.h> /* struct argp_option, struct
60
58
argp_state, struct argp,
61
59
argp_parse(), ARGP_ERR_UNKNOWN,
62
ARGP_KEY_END, ARGP_KEY_ARG,
63
error_t */
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
64
61
#include <signal.h> /* struct sigaction, sigemptyset(),
65
62
sigaddset(), sigaction(),
66
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
64
SIG_UNBLOCK, kill() */
69
65
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
66
72
67
#define BUFFER_SIZE 256
73
68
74
#define PDIR "/lib/mandos/plugins.d"
75
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
76
77
const char *argp_program_version = "plugin-runner " VERSION;
69
const char *argp_program_version = "mandos-client 1.0";
78
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
79
71
80
typedef struct plugin{
81
char *name; /* can be NULL or any plugin name */
82
char **argv;
83
int argc;
84
char **environ;
85
int envc;
86
bool disabled;
87
88
/* Variables used for running processes*/
72
struct process;
73
74
typedef struct process{
89
75
pid_t pid;
90
76
int fd;
91
77
char *buffer;
92
78
size_t buffer_size;
93
79
size_t buffer_length;
94
80
bool eof;
95
volatile sig_atomic_t completed;
81
bool completed;
96
82
int status;
83
struct process *next;
84
} process;
85
86
typedef struct plugin{
87
char *name; /* can be NULL or any plugin name */
88
char **argv;
89
int argc;
90
bool disabled;
97
91
struct plugin *next;
98
92
} plugin;
99
93
100
static plugin *plugin_list = NULL;
101
102
/* Gets an existing plugin based on name,
103
or if none is found, creates a new one */
104
static plugin *getplugin(char *name){
105
/* Check for exiting plugin with that name */
106
for(plugin *p = plugin_list; p != NULL; p = p->next){
107
if((p->name == name)
108
or (p->name and name and (strcmp(p->name, name) == 0))){
94
static plugin *getplugin(char *name, plugin **plugin_list){
95
for (plugin *p = *plugin_list; p != NULL; p = p->next){
96
if ((p->name == name)
97
or (p->name and name and (strcmp(p->name, name) == 0))){
109
98
return p;
110
99
}
111
100
}
112
101
/* Create a new plugin */
113
102
plugin *new_plugin = malloc(sizeof(plugin));
114
if(new_plugin == NULL){
115
return NULL;
116
}
117
char *copy_name = NULL;
118
if(name != NULL){
119
copy_name = strdup(name);
120
if(copy_name == NULL){
121
free(new_plugin);
122
return NULL;
123
}
124
}
125
126
*new_plugin = (plugin){ .name = copy_name,
127
.argc = 1,
128
.disabled = false,
129
.next = plugin_list };
130
103
if (new_plugin == NULL){
104
perror("malloc");
105
exit(EXIT_FAILURE);
106
}
107
new_plugin->name = name;
131
108
new_plugin->argv = malloc(sizeof(char *) * 2);
132
if(new_plugin->argv == NULL){
133
free(copy_name);
134
free(new_plugin);
135
return NULL;
109
if (new_plugin->argv == NULL){
110
perror("malloc");
111
exit(EXIT_FAILURE);
136
112
}
137
new_plugin->argv[0] = copy_name;
113
new_plugin->argv[0] = name;
138
114
new_plugin->argv[1] = NULL;
139
140
new_plugin->environ = malloc(sizeof(char *));
141
if(new_plugin->environ == NULL){
142
free(copy_name);
143
free(new_plugin->argv);
144
free(new_plugin);
145
return NULL;
146
}
147
new_plugin->environ[0] = NULL;
148
115
new_plugin->argc = 1;
116
new_plugin->disabled = false;
117
new_plugin->next = *plugin_list;
149
118
/* Append the new plugin to the list */
150
plugin_list = new_plugin;
119
*plugin_list = new_plugin;
151
120
return new_plugin;
152
121
}
153
122
154
/* Helper function for add_argument and add_environment */
155
static bool add_to_char_array(const char *new, char ***array,
156
int *len){
157
/* Resize the pointed-to array to hold one more pointer */
158
*array = realloc(*array, sizeof(char *)
159
* (size_t) ((*len) + 2));
160
/* Malloc check */
161
if(*array == NULL){
162
return false;
163
}
164
/* Make a copy of the new string */
165
char *copy = strdup(new);
166
if(copy == NULL){
167
return false;
168
}
169
/* Insert the copy */
170
(*array)[*len] = copy;
171
(*len)++;
172
/* Add a new terminating NULL pointer to the last element */
173
(*array)[*len] = NULL;
174
return true;
175
}
176
177
/* Add to a plugin's argument vector */
178
static bool add_argument(plugin *p, const char *arg){
179
if(p == NULL){
180
return false;
181
}
182
return add_to_char_array(arg, &(p->argv), &(p->argc));
183
}
184
185
/* Add to a plugin's environment */
186
static bool add_environment(plugin *p, const char *def, bool replace){
187
if(p == NULL){
188
return false;
189
}
190
/* namelen = length of name of environment variable */
191
size_t namelen = (size_t)(strchrnul(def, '=') - def);
192
/* Search for this environment variable */
193
for(char **e = p->environ; *e != NULL; e++){
194
if(strncmp(*e, def, namelen + 1) == 0){
195
/* It already exists */
196
if(replace){
197
char *new = realloc(*e, strlen(def) + 1);
198
if(new == NULL){
199
return false;
200
}
201
*e = new;
202
strcpy(*e, def);
203
}
204
return true;
205
}
206
}
207
return add_to_char_array(def, &(p->environ), &(p->envc));
123
static void addargument(plugin *p, char *arg){
124
p->argv[p->argc] = arg;
125
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
126
if (p->argv == NULL){
127
perror("malloc");
128
exit(EXIT_FAILURE);
129
}
130
p->argc++;
131
p->argv[p->argc] = NULL;
208
132
}
209
133
210
134
/*
211
135
* Based on the example in the GNU LibC manual chapter 13.13 "File
212
136
* Descriptor Flags".
213
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
137
* *Note File Descriptor Flags:(libc)Descriptor Flags.
214
138
*/
215
static int set_cloexec_flag(int fd){
139
static int set_cloexec_flag(int fd)
140
{
216
141
int ret = fcntl(fd, F_GETFD, 0);
217
142
/* If reading the flags failed, return error indication now. */
218
143
if(ret < 0){
222
147
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
223
148
}
224
149
150
process *process_list = NULL;
225
151
226
/* Mark processes as completed when they exit, and save their exit
152
/* Mark a process as completed when it exits, and save its exit
227
153
status. */
228
static void handle_sigchld(__attribute__((unused)) int sig){
229
int old_errno = errno;
230
while(true){
231
plugin *proc = plugin_list;
232
int status;
233
pid_t pid = waitpid(-1, &status, WNOHANG);
234
if(pid == 0){
235
/* Only still running child processes */
236
break;
237
}
238
if(pid == -1){
239
if(errno == ECHILD){
240
/* No child processes */
241
break;
242
}
243
perror("waitpid");
244
}
245
246
/* A child exited, find it in process_list */
247
while(proc != NULL and proc->pid != pid){
248
proc = proc->next;
249
}
250
if(proc == NULL){
251
/* Process not found in process list */
252
continue;
253
}
254
proc->status = status;
255
proc->completed = 1;
256
}
257
errno = old_errno;
154
void handle_sigchld(__attribute__((unused)) int sig){
155
process *proc = process_list;
156
int status;
157
pid_t pid = wait(&status);
158
if(pid == -1){
159
perror("wait");
160
return;
161
}
162
while(proc != NULL and proc->pid != pid){
163
proc = proc->next;
164
}
165
if(proc == NULL){
166
/* Process not found in process list */
167
return;
168
}
169
proc->status = status;
170
proc->completed = true;
258
171
}
259
172
260
/* Prints out a password to stdout */
261
static bool print_out_password(const char *buffer, size_t length){
173
bool print_out_password(const char *buffer, size_t length){
262
174
ssize_t ret;
175
if(length>0 and buffer[length-1] == '\n'){
176
length--;
177
}
263
178
for(size_t written = 0; written < length; written += (size_t)ret){
264
179
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
265
180
length - written));
270
185
return true;
271
186
}
272
187
273
/* Removes and free a plugin from the plugin list */
274
static void free_plugin(plugin *plugin_node){
275
276
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
277
free(*arg);
278
}
279
free(plugin_node->argv);
280
for(char **env = plugin_node->environ; *env != NULL; env++){
281
free(*env);
282
}
283
free(plugin_node->environ);
284
free(plugin_node->buffer);
285
286
/* Removes the plugin from the singly-linked list */
287
if(plugin_node == plugin_list){
288
/* First one - simple */
289
plugin_list = plugin_list->next;
290
} else {
291
/* Second one or later */
292
for(plugin *p = plugin_list; p != NULL; p = p->next){
293
if(p->next == plugin_node){
294
p->next = plugin_node->next;
295
break;
296
}
297
}
298
}
299
300
free(plugin_node);
301
}
302
303
static void free_plugin_list(void){
304
while(plugin_list != NULL){
305
free_plugin(plugin_list);
306
}
307
}
308
309
188
int main(int argc, char *argv[]){
310
char *plugindir = NULL;
311
char *argfile = NULL;
312
FILE *conffp;
189
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
313
190
size_t d_name_len;
314
191
DIR *dir = NULL;
315
192
struct dirent *dirst;
316
193
struct stat st;
317
194
fd_set rfds_all;
318
195
int ret, maxfd = 0;
319
ssize_t sret;
320
196
uid_t uid = 65534;
321
197
gid_t gid = 65534;
322
198
bool debug = false;
324
200
struct sigaction old_sigchld_action;
325
201
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
326
202
.sa_flags = SA_NOCLDSTOP };
327
char **custom_argv = NULL;
328
int custom_argc = 0;
329
203
char *plus_options = NULL;
204
char **plus_argv = NULL;
205
330
206
/* Establish a signal handler */
331
207
sigemptyset(&sigchld_action.sa_mask);
332
208
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
333
if(ret == -1){
209
if(ret < 0){
334
210
perror("sigaddset");
335
exitstatus = EXIT_FAILURE;
336
goto fallback;
211
exit(EXIT_FAILURE);
337
212
}
338
213
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
339
if(ret == -1){
214
if(ret < 0){
340
215
perror("sigaction");
341
exitstatus = EXIT_FAILURE;
342
goto fallback;
216
exit(EXIT_FAILURE);
343
217
}
344
218
345
219
/* The options we understand. */
347
221
{ .name = "global-options", .key = 'g',
348
222
.arg = "OPTION[,OPTION[,...]]",
349
223
.doc = "Options passed to all plugins" },
350
{ .name = "global-env", .key = 'G',
351
.arg = "VAR=value",
352
.doc = "Environment variable passed to all plugins" },
353
224
{ .name = "options-for", .key = 'o',
354
225
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
355
226
.doc = "Options passed only to specified plugin" },
356
{ .name = "env-for", .key = 'E',
357
.arg = "PLUGIN:ENV=value",
358
.doc = "Environment variable passed to specified plugin" },
359
227
{ .name = "disable", .key = 'd',
360
228
.arg = "PLUGIN",
361
229
.doc = "Disable a specific plugin", .group = 1 },
362
{ .name = "enable", .key = 'e',
363
.arg = "PLUGIN",
364
.doc = "Enable a specific plugin", .group = 1 },
365
230
{ .name = "plugin-dir", .key = 128,
366
231
.arg = "DIRECTORY",
367
232
.doc = "Specify a different plugin directory", .group = 2 },
368
{ .name = "config-file", .key = 129,
369
.arg = "FILE",
370
.doc = "Specify a different configuration file", .group = 2 },
371
{ .name = "userid", .key = 130,
372
.arg = "ID", .flags = 0,
373
.doc = "User ID the plugins will run as", .group = 3 },
374
{ .name = "groupid", .key = 131,
375
.arg = "ID", .flags = 0,
376
.doc = "Group ID the plugins will run as", .group = 3 },
377
{ .name = "debug", .key = 132,
378
.doc = "Debug mode", .group = 4 },
233
{ .name = "userid", .key = 129,
234
.arg = "ID", .flags = 0,
235
.doc = "User ID the plugins will run as", .group = 2 },
236
{ .name = "groupid", .key = 130,
237
.arg = "ID", .flags = 0,
238
.doc = "Group ID the plugins will run as", .group = 2 },
239
{ .name = "debug", .key = 131,
240
.doc = "Debug mode", .group = 3 },
379
241
{ .name = NULL }
380
242
};
381
243
382
error_t parse_opt(int key, char *arg, __attribute__((unused))
383
struct argp_state *state){
384
switch(key){
385
char *tmp;
386
intmax_t tmpmax;
387
case 'g': /* --global-options */
388
if(arg != NULL){
389
char *plugin_option;
390
while((plugin_option = strsep(&arg, ",")) != NULL){
391
if(plugin_option[0] == '\0'){
244
error_t parse_opt (int key, char *arg, struct argp_state *state) {
245
/* Get the INPUT argument from `argp_parse', which we know is a
246
pointer to our plugin list pointer. */
247
plugin **plugins = state->input;
248
switch (key) {
249
case 'g':
250
if (arg != NULL){
251
char *p;
252
while((p = strsep(&arg, ",")) != NULL){
253
if(strcmp(p, "") == 0){
392
254
continue;
393
255
}
394
if(not add_argument(getplugin(NULL), plugin_option)){
395
perror("add_argument");
396
return ARGP_ERR_UNKNOWN;
397
}
398
}
399
}
400
break;
401
case 'G': /* --global-env */
402
if(arg == NULL){
403
break;
404
}
405
if(not add_environment(getplugin(NULL), arg, true)){
406
perror("add_environment");
407
}
408
break;
409
case 'o': /* --options-for */
410
if(arg != NULL){
411
char *plugin_name = strsep(&arg, ":");
412
if(plugin_name[0] == '\0'){
413
break;
414
}
415
char *plugin_option;
416
while((plugin_option = strsep(&arg, ",")) != NULL){
417
if(not add_argument(getplugin(plugin_name), plugin_option)){
418
perror("add_argument");
419
return ARGP_ERR_UNKNOWN;
420
}
421
}
422
}
423
break;
424
case 'E': /* --env-for */
425
if(arg == NULL){
426
break;
427
}
428
{
429
char *envdef = strchr(arg, ':');
430
if(envdef == NULL){
431
break;
432
}
433
*envdef = '\0';
434
if(not add_environment(getplugin(arg), envdef+1, true)){
435
perror("add_environment");
436
}
437
}
438
break;
439
case 'd': /* --disable */
440
if(arg != NULL){
441
plugin *p = getplugin(arg);
442
if(p == NULL){
443
return ARGP_ERR_UNKNOWN;
444
}
445
p->disabled = true;
446
}
447
break;
448
case 'e': /* --enable */
449
if(arg != NULL){
450
plugin *p = getplugin(arg);
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
453
}
454
p->disabled = false;
455
}
456
break;
457
case 128: /* --plugin-dir */
458
free(plugindir);
459
plugindir = strdup(arg);
460
if(plugindir == NULL){
461
perror("strdup");
462
}
463
break;
464
case 129: /* --config-file */
465
/* This is already done by parse_opt_config_file() */
466
break;
467
case 130: /* --userid */
468
errno = 0;
469
tmpmax = strtoimax(arg, &tmp, 10);
470
if(errno != 0 or tmp == arg or *tmp != '\0'
471
or tmpmax != (uid_t)tmpmax){
472
fprintf(stderr, "Bad user ID number: \"%s\", using %"
473
PRIdMAX "\n", arg, (intmax_t)uid);
474
} else {
475
uid = (uid_t)tmpmax;
476
}
477
break;
478
case 131: /* --groupid */
479
errno = 0;
480
tmpmax = strtoimax(arg, &tmp, 10);
481
if(errno != 0 or tmp == arg or *tmp != '\0'
482
or tmpmax != (gid_t)tmpmax){
483
fprintf(stderr, "Bad group ID number: \"%s\", using %"
484
PRIdMAX "\n", arg, (intmax_t)gid);
485
} else {
486
gid = (gid_t)tmpmax;
487
}
488
break;
489
case 132: /* --debug */
256
addargument(getplugin(NULL, plugins), p);
257
}
258
}
259
break;
260
case 'o':
261
if (arg != NULL){
262
char *name = strsep(&arg, ":");
263
if(strcmp(name, "") == 0){
264
break;
265
}
266
char *opt = strsep(&arg, ":");
267
if(strcmp(opt, "") == 0){
268
break;
269
}
270
if(opt != NULL){
271
char *p;
272
while((p = strsep(&opt, ",")) != NULL){
273
if(strcmp(p, "") == 0){
274
continue;
275
}
276
addargument(getplugin(name, plugins), p);
277
}
278
}
279
}
280
break;
281
case 'd':
282
if (arg != NULL){
283
getplugin(arg, plugins)->disabled = true;
284
}
285
break;
286
case 128:
287
plugindir = arg;
288
break;
289
case 129:
290
uid = (uid_t)strtol(arg, NULL, 10);
291
break;
292
case 130:
293
gid = (gid_t)strtol(arg, NULL, 10);
294
break;
295
case 131:
490
296
debug = true;
491
297
break;
492
/*
493
* When adding more options before this line, remember to also add a
494
* "case" to the "parse_opt_config_file" function below.
495
*/
496
case ARGP_KEY_ARG:
497
/* Cryptsetup always passes an argument, which is an empty
498
string if "none" was specified in /etc/crypttab. So if
499
argument was empty, we ignore it silently. */
500
if(arg[0] != '\0'){
501
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
502
}
503
break;
504
case ARGP_KEY_END:
505
break;
506
default:
507
return ARGP_ERR_UNKNOWN;
508
}
509
return 0;
510
}
511
512
/* This option parser is the same as parse_opt() above, except it
513
ignores everything but the --config-file option. */
514
error_t parse_opt_config_file(int key, char *arg,
515
__attribute__((unused))
516
struct argp_state *state){
517
switch(key){
518
case 'g': /* --global-options */
519
case 'G': /* --global-env */
520
case 'o': /* --options-for */
521
case 'E': /* --env-for */
522
case 'd': /* --disable */
523
case 'e': /* --enable */
524
case 128: /* --plugin-dir */
525
break;
526
case 129: /* --config-file */
527
free(argfile);
528
argfile = strdup(arg);
529
if(argfile == NULL){
530
perror("strdup");
531
}
532
break;
533
case 130: /* --userid */
534
case 131: /* --groupid */
535
case 132: /* --debug */
536
case ARGP_KEY_ARG:
537
case ARGP_KEY_END:
538
break;
539
default:
540
return ARGP_ERR_UNKNOWN;
541
}
542
return 0;
543
}
544
545
struct argp argp = { .options = options,
546
.parser = parse_opt_config_file,
547
.args_doc = "",
298
case ARGP_KEY_ARG:
299
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
300
argp_usage (state);
301
}
302
plus_options = arg;
303
break;
304
case ARGP_KEY_END:
305
break;
306
default:
307
return ARGP_ERR_UNKNOWN;
308
}
309
return 0;
310
}
311
312
plugin *plugin_list = NULL;
313
314
struct argp argp = { .options = options, .parser = parse_opt,
315
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
548
316
.doc = "Mandos plugin runner -- Run plugins" };
549
317
550
/* Parse using parse_opt_config_file() in order to get the custom
551
config file location, if any. */
552
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
553
if(ret == ARGP_ERR_UNKNOWN){
318
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
319
if (ret == ARGP_ERR_UNKNOWN){
554
320
fprintf(stderr, "Unknown error while parsing arguments\n");
555
321
exitstatus = EXIT_FAILURE;
556
goto fallback;
557
}
558
559
/* Reset to the normal argument parser */
560
argp.parser = parse_opt;
561
562
/* Open the configfile if available */
563
if(argfile == NULL){
564
conffp = fopen(AFILE, "r");
565
} else {
566
conffp = fopen(argfile, "r");
567
}
568
if(conffp != NULL){
569
char *org_line = NULL;
570
char *p, *arg, *new_arg, *line;
571
size_t size = 0;
572
const char whitespace_delims[] = " \r\t\f\v\n";
573
const char comment_delim[] = "#";
574
575
custom_argc = 1;
576
custom_argv = malloc(sizeof(char*) * 2);
577
if(custom_argv == NULL){
322
goto end;
323
}
324
325
if(plus_options){
326
/* This is a mangled argument in the form of
327
"+--option+--other-option=parameter+--yet-another-option", etc */
328
/* Make new argc and argv vars, and call argp_parse() again. */
329
plus_options++; /* skip the first '+' character */
330
const char delims[] = "+";
331
char *arg;
332
int new_argc = 1;
333
plus_argv = malloc(sizeof(char*) * 2);
334
if(plus_argv == NULL){
578
335
perror("malloc");
579
336
exitstatus = EXIT_FAILURE;
580
goto fallback;
581
}
582
custom_argv[0] = argv[0];
583
custom_argv[1] = NULL;
584
585
/* for each line in the config file, strip whitespace and ignore
586
commented text */
587
while(true){
588
sret = getline(&org_line, &size, conffp);
589
if(sret == -1){
590
break;
591
}
592
593
line = org_line;
594
arg = strsep(&line, comment_delim);
595
while((p = strsep(&arg, whitespace_delims)) != NULL){
596
if(p[0] == '\0'){
597
continue;
598
}
599
new_arg = strdup(p);
600
if(new_arg == NULL){
601
perror("strdup");
602
exitstatus = EXIT_FAILURE;
603
free(org_line);
604
goto fallback;
605
}
606
607
custom_argc += 1;
608
custom_argv = realloc(custom_argv, sizeof(char *)
609
* ((unsigned int) custom_argc + 1));
610
if(custom_argv == NULL){
611
perror("realloc");
612
exitstatus = EXIT_FAILURE;
613
free(org_line);
614
goto fallback;
615
}
616
custom_argv[custom_argc-1] = new_arg;
617
custom_argv[custom_argc] = NULL;
618
}
619
}
620
do{
621
ret = fclose(conffp);
622
}while(ret == EOF and errno == EINTR);
623
if(ret == EOF){
624
perror("fclose");
625
exitstatus = EXIT_FAILURE;
626
goto fallback;
627
}
628
free(org_line);
629
} else {
630
/* Check for harmful errors and go to fallback. Other errors might
631
not affect opening plugins */
632
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
633
perror("fopen");
634
exitstatus = EXIT_FAILURE;
635
goto fallback;
636
}
637
}
638
/* If there was any arguments from configuration file,
639
pass them to parser as command arguments */
640
if(custom_argv != NULL){
641
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
642
0, NULL);
643
if(ret == ARGP_ERR_UNKNOWN){
337
goto end;
338
}
339
plus_argv[0] = argv[0];
340
plus_argv[1] = NULL;
341
342
while((arg = strsep(&plus_options, delims)) != NULL){
343
new_argc++;
344
plus_argv = realloc(plus_argv, sizeof(char *)
345
* ((unsigned int) new_argc + 1));
346
if(plus_argv == NULL){
347
perror("realloc");
348
exitstatus = EXIT_FAILURE;
349
goto end;
350
}
351
plus_argv[new_argc-1] = arg;
352
plus_argv[new_argc] = NULL;
353
}
354
355
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
356
if (ret == ARGP_ERR_UNKNOWN){
644
357
fprintf(stderr, "Unknown error while parsing arguments\n");
645
358
exitstatus = EXIT_FAILURE;
646
goto fallback;
359
goto end;
647
360
}
648
361
}
649
362
650
/* Parse actual command line arguments, to let them override the
651
config file */
652
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
653
if(ret == ARGP_ERR_UNKNOWN){
654
fprintf(stderr, "Unknown error while parsing arguments\n");
655
exitstatus = EXIT_FAILURE;
656
goto fallback;
657
}
658
659
363
if(debug){
660
364
for(plugin *p = plugin_list; p != NULL; p=p->next){
661
365
fprintf(stderr, "Plugin: %s has %d arguments\n",
663
367
for(char **a = p->argv; *a != NULL; a++){
664
368
fprintf(stderr, "\tArg: %s\n", *a);
665
369
}
666
fprintf(stderr, "...and %d environment variables\n", p->envc);
667
for(char **a = p->environ; *a != NULL; a++){
668
fprintf(stderr, "\t%s\n", *a);
669
}
670
370
}
671
371
}
672
372
673
/* Strip permissions down to nobody */
373
ret = setuid(uid);
374
if (ret == -1){
375
perror("setuid");
376
}
377
674
378
setgid(gid);
675
if(ret == -1){
379
if (ret == -1){
676
380
perror("setgid");
677
381
}
678
ret = setuid(uid);
679
if(ret == -1){
680
perror("setuid");
681
}
682
683
if(plugindir == NULL){
684
dir = opendir(PDIR);
685
} else {
686
dir = opendir(plugindir);
687
}
688
382
383
dir = opendir(plugindir);
689
384
if(dir == NULL){
690
385
perror("Could not open plugin dir");
691
386
exitstatus = EXIT_FAILURE;
692
goto fallback;
387
goto end;
693
388
}
694
389
695
390
/* Set the FD_CLOEXEC flag on the directory, if possible */
700
395
if(ret < 0){
701
396
perror("set_cloexec_flag");
702
397
exitstatus = EXIT_FAILURE;
703
goto fallback;
398
goto end;
704
399
}
705
400
}
706
401
}
707
402
708
403
FD_ZERO(&rfds_all);
709
404
710
/* Read and execute any executable in the plugin directory*/
711
405
while(true){
712
406
dirst = readdir(dir);
713
407
714
/* All directory entries have been processed */
408
// All directory entries have been processed
715
409
if(dirst == NULL){
716
if(errno == EBADF){
410
if (errno == EBADF){
717
411
perror("readdir");
718
412
exitstatus = EXIT_FAILURE;
719
goto fallback;
413
goto end;
720
414
}
721
415
break;
722
416
}
723
417
724
418
d_name_len = strlen(dirst->d_name);
725
419
726
/* Ignore dotfiles, backup files and other junk */
420
// Ignore dotfiles, backup files and other junk
727
421
{
728
422
bool bad_name = false;
729
423
731
425
732
426
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
733
427
".dpkg-old",
734
".dpkg-bak",
735
428
".dpkg-divert", NULL };
736
429
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
737
430
size_t pre_len = strlen(*pre);
745
438
break;
746
439
}
747
440
}
441
748
442
if(bad_name){
749
443
continue;
750
444
}
445
751
446
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
752
447
size_t suf_len = strlen(*suf);
753
448
if((d_name_len >= suf_len)
767
462
}
768
463
}
769
464
770
char *filename;
771
if(plugindir == NULL){
772
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
773
} else {
774
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
775
}
776
if(ret < 0){
777
perror("asprintf");
465
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
466
if (filename == NULL){
467
perror("malloc");
778
468
continue;
779
469
}
470
strcpy(filename, plugindir); /* Spurious warning */
471
strcat(filename, "/"); /* Spurious warning */
472
strcat(filename, dirst->d_name); /* Spurious warning */
780
473
781
474
ret = stat(filename, &st);
782
if(ret == -1){
475
if (ret == -1){
783
476
perror("stat");
784
477
free(filename);
785
478
continue;
786
479
}
787
480
788
/* Ignore non-executable files */
789
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
481
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
790
482
if(debug){
791
483
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
792
484
" with bad type or mode\n", filename);
794
486
free(filename);
795
487
continue;
796
488
}
797
798
plugin *p = getplugin(dirst->d_name);
799
if(p == NULL){
800
perror("getplugin");
801
free(filename);
802
continue;
803
}
804
if(p->disabled){
489
if(getplugin(dirst->d_name, &plugin_list)->disabled){
805
490
if(debug){
806
491
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
807
492
dirst->d_name);
809
494
free(filename);
810
495
continue;
811
496
}
497
plugin *p = getplugin(dirst->d_name, &plugin_list);
812
498
{
813
499
/* Add global arguments to argument list for this plugin */
814
plugin *g = getplugin(NULL);
815
if(g != NULL){
816
for(char **a = g->argv + 1; *a != NULL; a++){
817
if(not add_argument(p, *a)){
818
perror("add_argument");
819
}
820
}
821
/* Add global environment variables */
822
for(char **e = g->environ; *e != NULL; e++){
823
if(not add_environment(p, *e, false)){
824
perror("add_environment");
825
}
826
}
827
}
828
}
829
/* If this plugin has any environment variables, we will call
830
using execve and need to duplicate the environment from this
831
process, too. */
832
if(p->environ[0] != NULL){
833
for(char **e = environ; *e != NULL; e++){
834
if(not add_environment(p, *e, false)){
835
perror("add_environment");
836
}
837
}
838
}
839
840
int pipefd[2];
500
plugin *g = getplugin(NULL, &plugin_list);
501
for(char **a = g->argv + 1; *a != NULL; a++){
502
addargument(p, *a);
503
}
504
}
505
int pipefd[2];
841
506
ret = pipe(pipefd);
842
if(ret == -1){
507
if (ret == -1){
843
508
perror("pipe");
844
509
exitstatus = EXIT_FAILURE;
845
goto fallback;
510
goto end;
846
511
}
847
/* Ask OS to automatic close the pipe on exec */
848
512
ret = set_cloexec_flag(pipefd[0]);
849
513
if(ret < 0){
850
514
perror("set_cloexec_flag");
851
515
exitstatus = EXIT_FAILURE;
852
goto fallback;
516
goto end;
853
517
}
854
518
ret = set_cloexec_flag(pipefd[1]);
855
519
if(ret < 0){
856
520
perror("set_cloexec_flag");
857
521
exitstatus = EXIT_FAILURE;
858
goto fallback;
522
goto end;
859
523
}
860
524
/* Block SIGCHLD until process is safely in process list */
861
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
525
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
862
526
if(ret < 0){
863
527
perror("sigprocmask");
864
528
exitstatus = EXIT_FAILURE;
865
goto fallback;
529
goto end;
866
530
}
867
/* Starting a new process to be watched */
531
// Starting a new process to be watched
868
532
pid_t pid = fork();
869
533
if(pid == -1){
870
534
perror("fork");
871
535
exitstatus = EXIT_FAILURE;
872
goto fallback;
536
goto end;
873
537
}
874
538
if(pid == 0){
875
539
/* this is the child process */
878
542
perror("sigaction");
879
543
_exit(EXIT_FAILURE);
880
544
}
881
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
545
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
882
546
if(ret < 0){
883
547
perror("sigprocmask");
884
548
_exit(EXIT_FAILURE);
885
549
}
886
550
887
551
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
888
552
if(ret == -1){
889
553
perror("dup2");
895
559
above and must now close it manually here. */
896
560
closedir(dir);
897
561
}
898
if(p->environ[0] == NULL){
899
if(execv(filename, p->argv) < 0){
900
perror("execv");
901
_exit(EXIT_FAILURE);
902
}
903
} else {
904
if(execve(filename, p->argv, p->environ) < 0){
905
perror("execve");
906
_exit(EXIT_FAILURE);
907
}
562
if(execv(filename, p->argv) < 0){
563
perror("execv");
564
_exit(EXIT_FAILURE);
908
565
}
909
566
/* no return */
910
567
}
911
/* Parent process */
912
close(pipefd[1]); /* Close unused write end of pipe */
568
/* parent process */
913
569
free(filename);
914
plugin *new_plugin = getplugin(dirst->d_name);
915
if(new_plugin == NULL){
916
perror("getplugin");
917
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
570
close(pipefd[1]); /* close unused write end of pipe */
571
process *new_process = malloc(sizeof(process));
572
if (new_process == NULL){
573
perror("malloc");
574
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
918
575
if(ret < 0){
919
perror("sigprocmask");
576
perror("sigprocmask");
920
577
}
921
578
exitstatus = EXIT_FAILURE;
922
goto fallback;
579
goto end;
923
580
}
924
581
925
new_plugin->pid = pid;
926
new_plugin->fd = pipefd[0];
927
582
*new_process = (struct process){ .pid = pid,
583
.fd = pipefd[0],
584
.next = process_list };
585
// List handling
586
process_list = new_process;
928
587
/* Unblock SIGCHLD so signal handler can be run if this process
929
588
has already completed */
930
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
589
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
931
590
if(ret < 0){
932
591
perror("sigprocmask");
933
592
exitstatus = EXIT_FAILURE;
934
goto fallback;
935
}
936
937
FD_SET(new_plugin->fd, &rfds_all);
938
939
if(maxfd < new_plugin->fd){
940
maxfd = new_plugin->fd;
941
}
593
goto end;
594
}
595
596
FD_SET(new_process->fd, &rfds_all);
597
598
if (maxfd < new_process->fd){
599
maxfd = new_process->fd;
600
}
601
602
}
603
604
/* Free the plugin list */
605
for(plugin *next; plugin_list != NULL; plugin_list = next){
606
next = plugin_list->next;
607
free(plugin_list->argv);
608
free(plugin_list);
942
609
}
943
610
944
611
closedir(dir);
945
612
dir = NULL;
946
free_plugin(getplugin(NULL));
947
948
for(plugin *p = plugin_list; p != NULL; p = p->next){
949
if(p->pid != 0){
950
break;
951
}
952
if(p->next == NULL){
953
fprintf(stderr, "No plugin processes started. Incorrect plugin"
954
" directory?\n");
955
free_plugin_list();
956
}
613
614
if (process_list == NULL){
615
fprintf(stderr, "No plugin processes started. Incorrect plugin"
616
" directory?\n");
617
process_list = NULL;
957
618
}
958
959
/* Main loop while running plugins exist */
960
while(plugin_list){
619
while(process_list){
961
620
fd_set rfds = rfds_all;
962
621
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
963
if(select_ret == -1){
622
if (select_ret == -1){
964
623
perror("select");
965
624
exitstatus = EXIT_FAILURE;
966
goto fallback;
625
goto end;
967
626
}
968
627
/* OK, now either a process completed, or something can be read
969
628
from one of them */
970
for(plugin *proc = plugin_list; proc != NULL;){
629
for(process *proc = process_list; proc ; proc = proc->next){
971
630
/* Is this process completely done? */
972
if(proc->completed and proc->eof){
631
if(proc->eof and proc->completed){
973
632
/* Only accept the plugin output if it exited cleanly */
974
633
if(not WIFEXITED(proc->status)
975
634
or WEXITSTATUS(proc->status) != 0){
976
635
/* Bad exit by plugin */
977
978
636
if(debug){
979
637
if(WIFEXITED(proc->status)){
980
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
981
" status %d\n", proc->name,
982
(intmax_t) (proc->pid),
638
fprintf(stderr, "Plugin %u exited with status %d\n",
639
(unsigned int) (proc->pid),
983
640
WEXITSTATUS(proc->status));
984
} else if(WIFSIGNALED(proc->status)){
985
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
986
" signal %d: %s\n", proc->name,
987
(intmax_t) (proc->pid),
988
WTERMSIG(proc->status),
989
strsignal(WTERMSIG(proc->status)));
641
} else if(WIFSIGNALED(proc->status)) {
642
fprintf(stderr, "Plugin %u killed by signal %d\n",
643
(unsigned int) (proc->pid),
644
WTERMSIG(proc->status));
990
645
} else if(WCOREDUMP(proc->status)){
991
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
992
" core\n", proc->name, (intmax_t) (proc->pid));
646
fprintf(stderr, "Plugin %d dumped core\n",
647
(unsigned int) (proc->pid));
993
648
}
994
649
}
995
996
650
/* Remove the plugin */
997
651
FD_CLR(proc->fd, &rfds_all);
998
999
652
/* Block signal while modifying process_list */
1000
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
653
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1001
654
if(ret < 0){
1002
655
perror("sigprocmask");
1003
656
exitstatus = EXIT_FAILURE;
1004
goto fallback;
1005
}
1006
1007
plugin *next_plugin = proc->next;
1008
free_plugin(proc);
1009
proc = next_plugin;
1010
657
goto end;
658
}
659
/* Delete this process entry from the list */
660
if(process_list == proc){
661
/* First one - simple */
662
process_list = proc->next;
663
} else {
664
/* Second one or later */
665
for(process *p = process_list; p != NULL; p = p->next){
666
if(p->next == proc){
667
p->next = proc->next;
668
break;
669
}
670
}
671
}
1011
672
/* We are done modifying process list, so unblock signal */
1012
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1013
NULL);
673
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
674
NULL);
1014
675
if(ret < 0){
1015
676
perror("sigprocmask");
1016
exitstatus = EXIT_FAILURE;
1017
goto fallback;
1018
}
1019
1020
if(plugin_list == NULL){
1021
break;
1022
}
1023
1024
continue;
677
}
678
free(proc->buffer);
679
free(proc);
680
/* We deleted this process from the list, so we can't go
681
proc->next. Therefore, start over from the beginning of
682
the process list */
683
break;
1025
684
}
1026
1027
685
/* This process exited nicely, so print its buffer */
1028
1029
bool bret = print_out_password(proc->buffer,
1030
proc->buffer_length);
686
687
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1031
688
if(not bret){
1032
689
perror("print_out_password");
1033
690
exitstatus = EXIT_FAILURE;
1034
691
}
1035
goto fallback;
692
goto end;
1036
693
}
1037
1038
694
/* This process has not completed. Does it have any output? */
1039
695
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1040
696
/* This process had nothing to say at this time */
1041
proc = proc->next;
1042
697
continue;
1043
698
}
1044
699
/* Before reading, make the process' data buffer large enough */
1045
700
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1046
701
proc->buffer = realloc(proc->buffer, proc->buffer_size
1047
702
+ (size_t) BUFFER_SIZE);
1048
if(proc->buffer == NULL){
703
if (proc->buffer == NULL){
1049
704
perror("malloc");
1050
705
exitstatus = EXIT_FAILURE;
1051
goto fallback;
706
goto end;
1052
707
}
1053
708
proc->buffer_size += BUFFER_SIZE;
1054
709
}
1055
710
/* Read from the process */
1056
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1057
BUFFER_SIZE);
1058
if(sret < 0){
711
ret = read(proc->fd, proc->buffer + proc->buffer_length,
712
BUFFER_SIZE);
713
if(ret < 0){
1059
714
/* Read error from this process; ignore the error */
1060
proc = proc->next;
1061
715
continue;
1062
716
}
1063
if(sret == 0){
717
if(ret == 0){
1064
718
/* got EOF */
1065
719
proc->eof = true;
1066
720
} else {
1067
proc->buffer_length += (size_t) sret;
721
proc->buffer_length += (size_t) ret;
1068
722
}
1069
723
}
1070
724
}
1071
1072
1073
fallback:
1074
1075
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1076
/* Fallback if all plugins failed, none are found or an error
1077
occured */
725
726
727
end:
728
729
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
730
/* Fallback if all plugins failed, none are found or an error occured */
1078
731
bool bret;
1079
732
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1080
733
char *passwordbuffer = getpass("Password: ");
1081
size_t len = strlen(passwordbuffer);
1082
/* Strip trailing newline */
1083
if(len > 0 and passwordbuffer[len-1] == '\n'){
1084
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1085
len--;
1086
}
1087
bret = print_out_password(passwordbuffer, len);
734
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1088
735
if(not bret){
1089
736
perror("print_out_password");
1090
737
exitstatus = EXIT_FAILURE;
738
goto end;
1091
739
}
1092
740
}
1093
741
1094
742
/* Restore old signal handler */
1095
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1096
if(ret == -1){
1097
perror("sigaction");
1098
exitstatus = EXIT_FAILURE;
1099
}
1100
1101
if(custom_argv != NULL){
1102
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1103
free(*arg);
1104
}
1105
free(custom_argv);
743
sigaction(SIGCHLD, &old_sigchld_action, NULL);
744
745
free(plus_argv);
746
747
/* Free the plugin list */
748
for(plugin *next; plugin_list != NULL; plugin_list = next){
749
next = plugin_list->next;
750
free(plugin_list->argv);
751
free(plugin_list);
1106
752
}
1107
753
1108
754
if(dir != NULL){
1109
755
closedir(dir);
1110
756
}
1111
757
1112
/* Kill the processes */
1113
for(plugin *p = plugin_list; p != NULL; p = p->next){
1114
if(p->pid != 0){
1115
close(p->fd);
1116
ret = kill(p->pid, SIGTERM);
1117
if(ret == -1 and errno != ESRCH){
1118
/* Set-uid proccesses might not get closed */
1119
perror("kill");
1120
}
758
/* Free the process list and kill the processes */
759
for(process *next; process_list != NULL; process_list = next){
760
next = process_list->next;
761
close(process_list->fd);
762
ret = kill(process_list->pid, SIGTERM);
763
if(ret == -1 and errno != ESRCH){
764
/* set-uid proccesses migth not get closed */
765
perror("kill");
1121
766
}
767
free(process_list->buffer);
768
free(process_list);
1122
769
}
1123
770
1124
771
/* Wait for any remaining child processes to terminate */
1129
776
perror("wait");
1130
777
}
1131
778
1132
free_plugin_list();
1133
1134
free(plugindir);
1135
free(argfile);
1136
1137
779
return exitstatus;
1138
780
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0