To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 98
- compare with another revision
- download diff
- download tarball
- view history from revision 98
- Committer: Teddy Hogeborn
- Date: 2008-08-24 09:40:58 UTC
- Revision ID: teddy@fukt.bsnet.se-20080824094058-bdqng3t1e3hfnk2e
* plugin-runner.c (getplugin): Only copy "name" if not NULL. Free
"copy_name" if any error occurs.
(free_plugin_list): Do not free "name" member; it it freed as part
of argv.
(main): Set plugin_list to NULL after freeing it.
"copy_name" if any error occurs.
(free_plugin_list): Do not free "name" member; it it freed as part
of argv.
(main): Set plugin_list to NULL after freeing it.
- files added:
- plugins.d/usplash
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
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
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,
47
46
fcntl(), setuid(), setgid(),
48
47
F_GETFD, F_SETFD, FD_CLOEXEC,
49
48
access(), pipe(), fork(), close()
50
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
51
50
execv(), write(), read(),
52
51
close() */
53
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
57
56
#include <argp.h> /* struct argp_option, struct
58
57
argp_state, struct argp,
59
58
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG,
61
error_t */
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
62
60
#include <signal.h> /* struct sigaction, sigemptyset(),
63
61
sigaddset(), sigaction(),
64
62
sigprocmask(), SIG_BLOCK, SIGCHLD,
66
64
#include <errno.h> /* errno, EBADF */
67
65
68
66
#define BUFFER_SIZE 256
69
70
#define PDIR "/lib/mandos/plugins.d"
71
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
72
73
const char *argp_program_version = "plugin-runner " VERSION;
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
69
const char *argp_program_version = "plugin-runner 1.0";
74
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
75
71
72
struct process;
73
74
typedef struct process{
75
pid_t pid;
76
int fd;
77
char *buffer;
78
size_t buffer_size;
79
size_t buffer_length;
80
bool eof;
81
bool completed;
82
int status;
83
struct process *next;
84
} process;
85
76
86
typedef struct plugin{
77
87
char *name; /* can be NULL or any plugin name */
78
88
char **argv;
80
90
char **environ;
81
91
int envc;
82
92
bool disabled;
83
84
/* Variables used for running processes*/
85
pid_t pid;
86
int fd;
87
char *buffer;
88
size_t buffer_size;
89
size_t buffer_length;
90
bool eof;
91
volatile bool completed;
92
volatile int status;
93
93
struct plugin *next;
94
94
} plugin;
95
95
96
static plugin *plugin_list = NULL;
97
98
/* Gets an existing plugin based on name,
99
or if none is found, creates a new one */
100
static plugin *getplugin(char *name){
101
/* Check for exiting plugin with that name */
102
for (plugin *p = plugin_list; p != NULL; p = p->next){
96
static plugin *getplugin(char *name, plugin **plugin_list){
97
for (plugin *p = *plugin_list; p != NULL; p = p->next){
103
98
if ((p->name == name)
104
99
or (p->name and name and (strcmp(p->name, name) == 0))){
105
100
return p;
120
115
121
116
*new_plugin = (plugin) { .name = copy_name,
122
117
.argc = 1,
118
.envc = 0,
123
119
.disabled = false,
124
.next = plugin_list };
120
.next = *plugin_list };
125
121
126
122
new_plugin->argv = malloc(sizeof(char *) * 2);
127
123
if (new_plugin->argv == NULL){
131
127
}
132
128
new_plugin->argv[0] = copy_name;
133
129
new_plugin->argv[1] = NULL;
134
130
135
131
new_plugin->environ = malloc(sizeof(char *));
136
132
if(new_plugin->environ == NULL){
137
133
free(copy_name);
140
136
return NULL;
141
137
}
142
138
new_plugin->environ[0] = NULL;
143
144
139
/* Append the new plugin to the list */
145
plugin_list = new_plugin;
140
*plugin_list = new_plugin;
146
141
return new_plugin;
147
142
}
148
143
178
173
}
179
174
180
175
/* Add to a plugin's environment */
181
static bool add_environment(plugin *p, const char *def, bool replace){
176
static bool add_environment(plugin *p, const char *def){
182
177
if(p == NULL){
183
178
return false;
184
179
}
185
/* namelen = length of name of environment variable */
186
size_t namelen = (size_t)(strchrnul(def, '=') - def);
187
/* Search for this environment variable */
188
for(char **e = p->environ; *e != NULL; e++){
189
if(strncmp(*e, def, namelen + 1) == 0){
190
/* It already exists */
191
if(replace){
192
char *new = realloc(*e, strlen(def) + 1);
193
if(new == NULL){
194
return false;
195
}
196
*e = new;
197
strcpy(*e, def);
198
}
199
return true;
200
}
201
}
202
180
return add_to_char_array(def, &(p->environ), &(p->envc));
203
181
}
204
182
183
205
184
/*
206
185
* Based on the example in the GNU LibC manual chapter 13.13 "File
207
186
* Descriptor Flags".
208
187
* *Note File Descriptor Flags:(libc)Descriptor Flags.
209
188
*/
210
static int set_cloexec_flag(int fd){
189
static int set_cloexec_flag(int fd)
190
{
211
191
int ret = fcntl(fd, F_GETFD, 0);
212
192
/* If reading the flags failed, return error indication now. */
213
193
if(ret < 0){
217
197
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
218
198
}
219
199
200
process *process_list = NULL;
220
201
221
/* Mark processes as completed when they exit, and save their exit
202
/* Mark a process as completed when it exits, and save its exit
222
203
status. */
223
static void handle_sigchld(__attribute__((unused)) int sig){
224
while(true){
225
plugin *proc = plugin_list;
226
int status;
227
pid_t pid = waitpid(-1, &status, WNOHANG);
228
if(pid == 0){
229
/* Only still running child processes */
230
break;
231
}
232
if(pid == -1){
233
if (errno != ECHILD){
234
perror("waitpid");
235
}
236
/* No child processes */
237
break;
238
}
239
240
/* A child exited, find it in process_list */
241
while(proc != NULL and proc->pid != pid){
242
proc = proc->next;
243
}
244
if(proc == NULL){
245
/* Process not found in process list */
246
continue;
247
}
248
proc->status = status;
249
proc->completed = true;
250
}
204
void handle_sigchld(__attribute__((unused)) int sig){
205
process *proc = process_list;
206
int status;
207
pid_t pid = wait(&status);
208
if(pid == -1){
209
perror("wait");
210
return;
211
}
212
while(proc != NULL and proc->pid != pid){
213
proc = proc->next;
214
}
215
if(proc == NULL){
216
/* Process not found in process list */
217
return;
218
}
219
proc->status = status;
220
proc->completed = true;
251
221
}
252
222
253
/* Prints out a password to stdout */
254
static bool print_out_password(const char *buffer, size_t length){
223
bool print_out_password(const char *buffer, size_t length){
255
224
ssize_t ret;
225
if(length>0 and buffer[length-1] == '\n'){
226
length--;
227
}
256
228
for(size_t written = 0; written < length; written += (size_t)ret){
257
229
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
258
230
length - written));
263
235
return true;
264
236
}
265
237
266
/* Removes and free a plugin from the plugin list */
267
static void free_plugin(plugin *plugin_node){
268
269
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
270
free(*arg);
271
}
272
free(plugin_node->argv);
273
for(char **env = plugin_node->environ; *env != NULL; env++){
274
free(*env);
275
}
276
free(plugin_node->environ);
277
free(plugin_node->buffer);
278
279
/* Removes the plugin from the singly-linked list */
280
if(plugin_node == plugin_list){
281
/* First one - simple */
282
plugin_list = plugin_list->next;
283
} else {
284
/* Second one or later */
285
for(plugin *p = plugin_list; p != NULL; p = p->next){
286
if(p->next == plugin_node){
287
p->next = plugin_node->next;
288
break;
289
}
238
char **add_to_argv(char **argv, int *argc, char *arg){
239
if (argv == NULL){
240
*argc = 1;
241
argv = malloc(sizeof(char*) * 2);
242
if(argv == NULL){
243
return NULL;
290
244
}
291
}
292
293
free(plugin_node);
245
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
246
argv[1] = NULL;
247
}
248
*argc += 1;
249
argv = realloc(argv, sizeof(char *)
250
* ((unsigned int) *argc + 1));
251
if(argv == NULL){
252
return NULL;
253
}
254
argv[*argc-1] = arg;
255
argv[*argc] = NULL;
256
return argv;
294
257
}
295
258
296
static void free_plugin_list(void){
297
while(plugin_list != NULL){
298
free_plugin(plugin_list);
259
static void free_plugin_list(plugin *plugin_list){
260
for(plugin *next; plugin_list != NULL; plugin_list = next){
261
next = plugin_list->next;
262
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
263
free(*arg);
264
}
265
free(plugin_list->argv);
266
for(char **env = plugin_list->environ; *env != NULL; env++){
267
free(*env);
268
}
269
free(plugin_list->environ);
270
free(plugin_list);
299
271
}
300
272
}
301
273
302
274
int main(int argc, char *argv[]){
303
char *plugindir = NULL;
304
char *argfile = NULL;
275
const char *plugindir = "/lib/mandos/plugins.d";
276
const char *argfile = ARGFILE;
305
277
FILE *conffp;
306
278
size_t d_name_len;
307
279
DIR *dir = NULL;
309
281
struct stat st;
310
282
fd_set rfds_all;
311
283
int ret, maxfd = 0;
312
ssize_t sret;
313
284
uid_t uid = 65534;
314
285
gid_t gid = 65534;
315
286
bool debug = false;
340
311
{ .name = "global-options", .key = 'g',
341
312
.arg = "OPTION[,OPTION[,...]]",
342
313
.doc = "Options passed to all plugins" },
343
{ .name = "global-env", .key = 'G',
314
{ .name = "global-envs", .key = 'e',
344
315
.arg = "VAR=value",
345
316
.doc = "Environment variable passed to all plugins" },
346
317
{ .name = "options-for", .key = 'o',
347
318
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
348
319
.doc = "Options passed only to specified plugin" },
349
{ .name = "env-for", .key = 'E',
320
{ .name = "envs-for", .key = 'f',
350
321
.arg = "PLUGIN:ENV=value",
351
322
.doc = "Environment variable passed to specified plugin" },
352
323
{ .name = "disable", .key = 'd',
353
324
.arg = "PLUGIN",
354
325
.doc = "Disable a specific plugin", .group = 1 },
355
{ .name = "enable", .key = 'e',
356
.arg = "PLUGIN",
357
.doc = "Enable a specific plugin", .group = 1 },
358
326
{ .name = "plugin-dir", .key = 128,
359
327
.arg = "DIRECTORY",
360
328
.doc = "Specify a different plugin directory", .group = 2 },
361
{ .name = "config-file", .key = 129,
362
.arg = "FILE",
363
.doc = "Specify a different configuration file", .group = 2 },
364
{ .name = "userid", .key = 130,
365
.arg = "ID", .flags = 0,
366
.doc = "User ID the plugins will run as", .group = 3 },
367
{ .name = "groupid", .key = 131,
368
.arg = "ID", .flags = 0,
369
.doc = "Group ID the plugins will run as", .group = 3 },
370
{ .name = "debug", .key = 132,
371
.doc = "Debug mode", .group = 4 },
329
{ .name = "userid", .key = 129,
330
.arg = "ID", .flags = 0,
331
.doc = "User ID the plugins will run as", .group = 2 },
332
{ .name = "groupid", .key = 130,
333
.arg = "ID", .flags = 0,
334
.doc = "Group ID the plugins will run as", .group = 2 },
335
{ .name = "debug", .key = 131,
336
.doc = "Debug mode", .group = 3 },
372
337
{ .name = NULL }
373
338
};
374
339
375
error_t parse_opt (int key, char *arg, __attribute__((unused))
376
struct argp_state *state) {
340
error_t parse_opt (int key, char *arg, struct argp_state *state) {
341
/* Get the INPUT argument from `argp_parse', which we know is a
342
pointer to our plugin list pointer. */
343
plugin **plugins = state->input;
377
344
switch (key) {
378
case 'g': /* --global-options */
345
case 'g':
379
346
if (arg != NULL){
380
347
char *p;
381
348
while((p = strsep(&arg, ",")) != NULL){
382
349
if(p[0] == '\0'){
383
350
continue;
384
351
}
385
if(not add_argument(getplugin(NULL), p)){
352
if(not add_argument(getplugin(NULL, plugins), p)){
386
353
perror("add_argument");
387
354
return ARGP_ERR_UNKNOWN;
388
355
}
389
356
}
390
357
}
391
358
break;
392
case 'G': /* --global-env */
359
case 'e':
393
360
if(arg == NULL){
394
361
break;
395
362
}
396
if(not add_environment(getplugin(NULL), arg, true)){
397
perror("add_environment");
363
{
364
char *envdef = strdup(arg);
365
if(envdef == NULL){
366
break;
367
}
368
if(not add_environment(getplugin(NULL, plugins), envdef)){
369
perror("add_environment");
370
}
398
371
}
399
372
break;
400
case 'o': /* --options-for */
373
case 'o':
401
374
if (arg != NULL){
402
375
char *p_name = strsep(&arg, ":");
403
if(p_name[0] == '\0' or arg == NULL){
376
if(p_name[0] == '\0'){
404
377
break;
405
378
}
406
379
char *opt = strsep(&arg, ":");
407
if(opt[0] == '\0' or opt == NULL){
380
if(opt[0] == '\0'){
408
381
break;
409
382
}
410
char *p;
411
while((p = strsep(&opt, ",")) != NULL){
412
if(p[0] == '\0'){
413
continue;
414
}
415
if(not add_argument(getplugin(p_name), p)){
416
perror("add_argument");
417
return ARGP_ERR_UNKNOWN;
383
if(opt != NULL){
384
char *p;
385
while((p = strsep(&opt, ",")) != NULL){
386
if(p[0] == '\0'){
387
continue;
388
}
389
if(not add_argument(getplugin(p_name, plugins), p)){
390
perror("add_argument");
391
return ARGP_ERR_UNKNOWN;
392
}
418
393
}
419
394
}
420
395
}
421
396
break;
422
case 'E': /* --env-for */
397
case 'f':
423
398
if(arg == NULL){
424
399
break;
425
400
}
428
403
if(envdef == NULL){
429
404
break;
430
405
}
431
*envdef = '\0';
432
if(not add_environment(getplugin(arg), envdef+1, true)){
406
char *p_name = strndup(arg, (size_t) (envdef-arg));
407
if(p_name == NULL){
408
break;
409
}
410
envdef++;
411
if(not add_environment(getplugin(p_name, plugins), envdef)){
433
412
perror("add_environment");
434
413
}
435
414
}
436
415
break;
437
case 'd': /* --disable */
416
case 'd':
438
417
if (arg != NULL){
439
plugin *p = getplugin(arg);
418
plugin *p = getplugin(arg, plugins);
440
419
if(p == NULL){
441
420
return ARGP_ERR_UNKNOWN;
442
421
}
443
422
p->disabled = true;
444
423
}
445
424
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 */
425
case 128:
426
plugindir = arg;
427
break;
428
case 129:
466
429
uid = (uid_t)strtol(arg, NULL, 10);
467
430
break;
468
case 131: /* --groupid */
431
case 130:
469
432
gid = (gid_t)strtol(arg, NULL, 10);
470
433
break;
471
case 132: /* --debug */
434
case 131:
472
435
debug = true;
473
436
break;
474
437
case ARGP_KEY_ARG:
475
/* Cryptsetup always passes an argument, which is an empty
476
string if "none" was specified in /etc/crypttab. So if
477
argument was empty, we ignore it silently. */
478
if(arg[0] != '\0'){
479
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
480
}
481
break;
482
case ARGP_KEY_END:
483
break;
484
default:
485
return ARGP_ERR_UNKNOWN;
486
}
487
return 0;
488
}
489
490
/* This option parser is the same as parse_opt() above, except it
491
ignores everything but the --config-file option. */
492
error_t parse_opt_config_file (int key, char *arg,
493
__attribute__((unused))
494
struct argp_state *state) {
495
switch (key) {
496
case 'g': /* --global-options */
497
case 'G': /* --global-env */
498
case 'o': /* --options-for */
499
case 'E': /* --env-for */
500
case 'd': /* --disable */
501
case 'e': /* --enable */
502
case 128: /* --plugin-dir */
503
break;
504
case 129: /* --config-file */
505
free(argfile);
506
argfile = strdup(arg);
507
if(argfile == NULL){
508
perror("strdup");
509
}
510
break;
511
case 130: /* --userid */
512
case 131: /* --groupid */
513
case 132: /* --debug */
514
case ARGP_KEY_ARG:
515
case ARGP_KEY_END:
516
break;
517
default:
518
return ARGP_ERR_UNKNOWN;
519
}
520
return 0;
521
}
522
523
struct argp argp = { .options = options,
524
.parser = parse_opt_config_file,
525
.args_doc = "",
438
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
439
break;
440
case ARGP_KEY_END:
441
break;
442
default:
443
return ARGP_ERR_UNKNOWN;
444
}
445
return 0;
446
}
447
448
plugin *plugin_list = NULL;
449
450
struct argp argp = { .options = options, .parser = parse_opt,
451
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
526
452
.doc = "Mandos plugin runner -- Run plugins" };
527
453
528
/* Parse using the parse_opt_config_file in order to get the custom
529
config file location, if any. */
530
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
454
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
531
455
if (ret == ARGP_ERR_UNKNOWN){
532
456
fprintf(stderr, "Unknown error while parsing arguments\n");
533
457
exitstatus = EXIT_FAILURE;
534
458
goto fallback;
535
459
}
536
537
/* Reset to the normal argument parser */
538
argp.parser = parse_opt;
539
540
/* Open the configfile if available */
541
if (argfile == NULL){
542
conffp = fopen(AFILE, "r");
543
} else {
544
conffp = fopen(argfile, "r");
545
}
460
461
conffp = fopen(argfile, "r");
546
462
if(conffp != NULL){
547
463
char *org_line = NULL;
548
464
char *p, *arg, *new_arg, *line;
549
465
size_t size = 0;
466
ssize_t sret;
550
467
const char whitespace_delims[] = " \r\t\f\v\n";
551
468
const char comment_delim[] = "#";
552
469
553
custom_argc = 1;
554
custom_argv = malloc(sizeof(char*) * 2);
555
if(custom_argv == NULL){
556
perror("malloc");
557
exitstatus = EXIT_FAILURE;
558
goto fallback;
559
}
560
custom_argv[0] = argv[0];
561
custom_argv[1] = NULL;
562
563
/* for each line in the config file, strip whitespace and ignore
564
commented text */
565
470
while(true){
566
471
sret = getline(&org_line, &size, conffp);
567
472
if(sret == -1){
575
480
continue;
576
481
}
577
482
new_arg = strdup(p);
578
if(new_arg == NULL){
579
perror("strdup");
580
exitstatus = EXIT_FAILURE;
581
free(org_line);
582
goto fallback;
583
}
584
585
custom_argc += 1;
586
custom_argv = realloc(custom_argv, sizeof(char *)
587
* ((unsigned int) custom_argc + 1));
588
if(custom_argv == NULL){
589
perror("realloc");
590
exitstatus = EXIT_FAILURE;
591
free(org_line);
592
goto fallback;
593
}
594
custom_argv[custom_argc-1] = new_arg;
595
custom_argv[custom_argc] = NULL;
483
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
484
if (custom_argv == NULL){
485
perror("add_to_argv");
486
exitstatus = EXIT_FAILURE;
487
goto fallback;
488
}
596
489
}
597
490
}
598
491
free(org_line);
599
} else {
492
} else{
600
493
/* Check for harmful errors and go to fallback. Other errors might
601
494
not affect opening plugins */
602
495
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
605
498
goto fallback;
606
499
}
607
500
}
608
/* If there was any arguments from configuration file,
609
pass them to parser as command arguments */
501
610
502
if(custom_argv != NULL){
611
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
612
0, NULL);
503
custom_argv[0] = argv[0];
504
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
613
505
if (ret == ARGP_ERR_UNKNOWN){
614
506
fprintf(stderr, "Unknown error while parsing arguments\n");
615
507
exitstatus = EXIT_FAILURE;
617
509
}
618
510
}
619
511
620
/* Parse actual command line arguments, to let them override the
621
config file */
622
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
623
if (ret == ARGP_ERR_UNKNOWN){
624
fprintf(stderr, "Unknown error while parsing arguments\n");
625
exitstatus = EXIT_FAILURE;
626
goto fallback;
627
}
628
629
512
if(debug){
630
513
for(plugin *p = plugin_list; p != NULL; p=p->next){
631
514
fprintf(stderr, "Plugin: %s has %d arguments\n",
640
523
}
641
524
}
642
525
643
/* Strip permissions down to nobody */
644
526
ret = setuid(uid);
645
527
if (ret == -1){
646
528
perror("setuid");
647
}
529
}
530
648
531
setgid(gid);
649
532
if (ret == -1){
650
533
perror("setgid");
651
534
}
652
535
653
if (plugindir == NULL){
654
dir = opendir(PDIR);
655
} else {
656
dir = opendir(plugindir);
657
}
658
536
dir = opendir(plugindir);
659
537
if(dir == NULL){
660
538
perror("Could not open plugin dir");
661
539
exitstatus = EXIT_FAILURE;
677
555
678
556
FD_ZERO(&rfds_all);
679
557
680
/* Read and execute any executable in the plugin directory*/
681
558
while(true){
682
559
dirst = readdir(dir);
683
560
684
/* All directory entries have been processed */
561
// All directory entries have been processed
685
562
if(dirst == NULL){
686
563
if (errno == EBADF){
687
564
perror("readdir");
693
570
694
571
d_name_len = strlen(dirst->d_name);
695
572
696
/* Ignore dotfiles, backup files and other junk */
573
// Ignore dotfiles, backup files and other junk
697
574
{
698
575
bool bad_name = false;
699
576
701
578
702
579
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
703
580
".dpkg-old",
704
".dpkg-bak",
705
581
".dpkg-divert", NULL };
706
582
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
707
583
size_t pre_len = strlen(*pre);
715
591
break;
716
592
}
717
593
}
594
718
595
if(bad_name){
719
596
continue;
720
597
}
598
721
599
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
722
600
size_t suf_len = strlen(*suf);
723
601
if((d_name_len >= suf_len)
738
616
}
739
617
740
618
char *filename;
741
if(plugindir == NULL){
742
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
743
} else {
744
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
745
}
619
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
746
620
if(ret < 0){
747
621
perror("asprintf");
748
622
continue;
754
628
free(filename);
755
629
continue;
756
630
}
757
758
/* Ignore non-executable files */
631
759
632
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
760
633
if(debug){
761
634
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
764
637
free(filename);
765
638
continue;
766
639
}
767
768
plugin *p = getplugin(dirst->d_name);
640
plugin *p = getplugin(dirst->d_name, &plugin_list);
769
641
if(p == NULL){
770
642
perror("getplugin");
771
643
free(filename);
781
653
}
782
654
{
783
655
/* Add global arguments to argument list for this plugin */
784
plugin *g = getplugin(NULL);
656
plugin *g = getplugin(NULL, &plugin_list);
785
657
if(g != NULL){
786
658
for(char **a = g->argv + 1; *a != NULL; a++){
787
659
if(not add_argument(p, *a)){
790
662
}
791
663
/* Add global environment variables */
792
664
for(char **e = g->environ; *e != NULL; e++){
793
if(not add_environment(p, *e, false)){
665
if(not add_environment(p, *e)){
794
666
perror("add_environment");
795
667
}
796
668
}
801
673
process, too. */
802
674
if(p->environ[0] != NULL){
803
675
for(char **e = environ; *e != NULL; e++){
804
if(not add_environment(p, *e, false)){
676
char *copy = strdup(*e);
677
if(copy == NULL){
678
perror("strdup");
679
continue;
680
}
681
if(not add_environment(p, copy)){
805
682
perror("add_environment");
806
683
}
807
684
}
814
691
exitstatus = EXIT_FAILURE;
815
692
goto fallback;
816
693
}
817
/* Ask OS to automatic close the pipe on exec */
818
694
ret = set_cloexec_flag(pipefd[0]);
819
695
if(ret < 0){
820
696
perror("set_cloexec_flag");
834
710
exitstatus = EXIT_FAILURE;
835
711
goto fallback;
836
712
}
837
/* Starting a new process to be watched */
713
// Starting a new process to be watched
838
714
pid_t pid = fork();
839
715
if(pid == -1){
840
716
perror("fork");
848
724
perror("sigaction");
849
725
_exit(EXIT_FAILURE);
850
726
}
851
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
727
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
852
728
if(ret < 0){
853
729
perror("sigprocmask");
854
730
_exit(EXIT_FAILURE);
855
731
}
856
732
857
733
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
858
734
if(ret == -1){
859
735
perror("dup2");
878
754
}
879
755
/* no return */
880
756
}
881
/* Parent process */
882
close(pipefd[1]); /* Close unused write end of pipe */
757
/* parent process */
883
758
free(filename);
884
plugin *new_plugin = getplugin(dirst->d_name);
885
if (new_plugin == NULL){
886
perror("getplugin");
759
close(pipefd[1]); /* close unused write end of pipe */
760
process *new_process = malloc(sizeof(process));
761
if (new_process == NULL){
762
perror("malloc");
887
763
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
888
764
if(ret < 0){
889
perror("sigprocmask");
765
perror("sigprocmask");
890
766
}
891
767
exitstatus = EXIT_FAILURE;
892
768
goto fallback;
893
769
}
894
770
895
new_plugin->pid = pid;
896
new_plugin->fd = pipefd[0];
897
771
*new_process = (struct process){ .pid = pid,
772
.fd = pipefd[0],
773
.next = process_list };
774
// List handling
775
process_list = new_process;
898
776
/* Unblock SIGCHLD so signal handler can be run if this process
899
777
has already completed */
900
778
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
904
782
goto fallback;
905
783
}
906
784
907
FD_SET(new_plugin->fd, &rfds_all);
785
FD_SET(new_process->fd, &rfds_all);
908
786
909
if (maxfd < new_plugin->fd){
910
maxfd = new_plugin->fd;
787
if (maxfd < new_process->fd){
788
maxfd = new_process->fd;
911
789
}
790
912
791
}
913
792
793
free_plugin_list(plugin_list);
794
plugin_list = NULL;
795
914
796
closedir(dir);
915
797
dir = NULL;
916
917
for(plugin *p = plugin_list; p != NULL; p = p->next){
918
if(p->pid != 0){
919
break;
920
}
921
if(p->next == NULL){
922
fprintf(stderr, "No plugin processes started. Incorrect plugin"
923
" directory?\n");
924
free_plugin_list();
925
}
798
799
if (process_list == NULL){
800
fprintf(stderr, "No plugin processes started. Incorrect plugin"
801
" directory?\n");
802
process_list = NULL;
926
803
}
927
928
/* Main loop while running plugins exist */
929
while(plugin_list){
804
while(process_list){
930
805
fd_set rfds = rfds_all;
931
806
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
932
807
if (select_ret == -1){
936
811
}
937
812
/* OK, now either a process completed, or something can be read
938
813
from one of them */
939
for(plugin *proc = plugin_list; proc != NULL;){
814
for(process *proc = process_list; proc ; proc = proc->next){
940
815
/* Is this process completely done? */
941
816
if(proc->eof and proc->completed){
942
817
/* Only accept the plugin output if it exited cleanly */
943
818
if(not WIFEXITED(proc->status)
944
819
or WEXITSTATUS(proc->status) != 0){
945
820
/* Bad exit by plugin */
946
947
821
if(debug){
948
822
if(WIFEXITED(proc->status)){
949
823
fprintf(stderr, "Plugin %u exited with status %d\n",
958
832
(unsigned int) (proc->pid));
959
833
}
960
834
}
961
962
835
/* Remove the plugin */
963
836
FD_CLR(proc->fd, &rfds_all);
964
965
837
/* Block signal while modifying process_list */
966
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
838
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
967
839
if(ret < 0){
968
840
perror("sigprocmask");
969
841
exitstatus = EXIT_FAILURE;
970
842
goto fallback;
971
843
}
972
973
plugin *next_plugin = proc->next;
974
free_plugin(proc);
975
proc = next_plugin;
976
844
/* Delete this process entry from the list */
845
if(process_list == proc){
846
/* First one - simple */
847
process_list = proc->next;
848
} else {
849
/* Second one or later */
850
for(process *p = process_list; p != NULL; p = p->next){
851
if(p->next == proc){
852
p->next = proc->next;
853
break;
854
}
855
}
856
}
977
857
/* We are done modifying process list, so unblock signal */
978
858
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
979
859
NULL);
980
860
if(ret < 0){
981
861
perror("sigprocmask");
982
exitstatus = EXIT_FAILURE;
983
goto fallback;
984
}
985
986
if(plugin_list == NULL){
987
break;
988
}
989
990
continue;
862
}
863
free(proc->buffer);
864
free(proc);
865
/* We deleted this process from the list, so we can't go
866
proc->next. Therefore, start over from the beginning of
867
the process list */
868
break;
991
869
}
992
993
870
/* This process exited nicely, so print its buffer */
994
995
bool bret = print_out_password(proc->buffer,
996
proc->buffer_length);
871
872
bool bret = print_out_password(proc->buffer, proc->buffer_length);
997
873
if(not bret){
998
874
perror("print_out_password");
999
875
exitstatus = EXIT_FAILURE;
1000
876
}
1001
877
goto fallback;
1002
878
}
1003
1004
879
/* This process has not completed. Does it have any output? */
1005
880
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1006
881
/* This process had nothing to say at this time */
1007
proc = proc->next;
1008
882
continue;
1009
883
}
1010
884
/* Before reading, make the process' data buffer large enough */
1019
893
proc->buffer_size += BUFFER_SIZE;
1020
894
}
1021
895
/* Read from the process */
1022
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1023
BUFFER_SIZE);
1024
if(sret < 0){
896
ret = read(proc->fd, proc->buffer + proc->buffer_length,
897
BUFFER_SIZE);
898
if(ret < 0){
1025
899
/* Read error from this process; ignore the error */
1026
proc = proc->next;
1027
900
continue;
1028
901
}
1029
if(sret == 0){
902
if(ret == 0){
1030
903
/* got EOF */
1031
904
proc->eof = true;
1032
905
} else {
1033
proc->buffer_length += (size_t) sret;
906
proc->buffer_length += (size_t) ret;
1034
907
}
1035
908
}
1036
909
}
1038
911
1039
912
fallback:
1040
913
1041
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1042
/* Fallback if all plugins failed, none are found or an error
1043
occured */
914
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
915
/* Fallback if all plugins failed, none are found or an error occured */
1044
916
bool bret;
1045
917
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1046
918
char *passwordbuffer = getpass("Password: ");
1047
size_t len = strlen(passwordbuffer);
1048
/* Strip trailing newline */
1049
if(len > 0 and passwordbuffer[len-1] == '\n'){
1050
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1051
len--;
1052
}
1053
bret = print_out_password(passwordbuffer, len);
919
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1054
920
if(not bret){
1055
921
perror("print_out_password");
1056
922
exitstatus = EXIT_FAILURE;
1063
929
perror("sigaction");
1064
930
exitstatus = EXIT_FAILURE;
1065
931
}
1066
932
1067
933
if(custom_argv != NULL){
1068
for(char **arg = custom_argv+1; *arg != NULL; arg++){
934
for(char **arg = custom_argv; *arg != NULL; arg++){
1069
935
free(*arg);
1070
936
}
1071
937
free(custom_argv);
1072
938
}
939
free_plugin_list(plugin_list);
1073
940
1074
941
if(dir != NULL){
1075
942
closedir(dir);
1076
943
}
1077
944
1078
/* Kill the processes */
1079
for(plugin *p = plugin_list; p != NULL; p = p->next){
1080
if(p->pid != 0){
1081
close(p->fd);
1082
ret = kill(p->pid, SIGTERM);
1083
if(ret == -1 and errno != ESRCH){
1084
/* Set-uid proccesses might not get closed */
1085
perror("kill");
1086
}
945
/* Free the process list and kill the processes */
946
for(process *next; process_list != NULL; process_list = next){
947
next = process_list->next;
948
close(process_list->fd);
949
ret = kill(process_list->pid, SIGTERM);
950
if(ret == -1 and errno != ESRCH){
951
/* set-uid proccesses migth not get closed */
952
perror("kill");
1087
953
}
954
free(process_list->buffer);
955
free(process_list);
1088
956
}
1089
957
1090
958
/* Wait for any remaining child processes to terminate */
1095
963
perror("wait");
1096
964
}
1097
965
1098
free_plugin_list();
1099
1100
free(plugindir);
1101
free(argfile);
1102
1103
966
return exitstatus;
1104
967
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0