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 24.1.65
- compare with another revision
- download diff
- download tarball
- view history from revision 24.1.65
- Committer: Björn Påhlsson
- Date: 2008-08-24 23:13:57 UTC
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 102.
- Revision ID: belorn@braxen-20080824231357-e304pw7ls2dnnvw5
* plugin-runner.c (handle_sigchld): Loop until all exited children
have been wait()ed for.
have been wait()ed for.
- 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 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
6
6
*
7
7
* This program is free software: you can redistribute it and/or
8
8
* modify it under the terms of the GNU General Public License as
27
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
28
EXIT_SUCCESS, realloc() */
29
29
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, fileno(), fprintf(),
31
stderr, STDOUT_FILENO */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
33
stat, waitpid(), WIFEXITED(),
34
34
WEXITSTATUS(), wait(), pid_t,
46
46
fcntl(), setuid(), setgid(),
47
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
48
access(), pipe(), fork(), close()
49
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
50
50
execv(), write(), read(),
51
51
close() */
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
56
56
#include <argp.h> /* struct argp_option, struct
57
57
argp_state, struct argp,
58
58
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
error_t */
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
61
60
#include <signal.h> /* struct sigaction, sigemptyset(),
62
61
sigaddset(), sigaction(),
63
62
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
64
#include <errno.h> /* errno, EBADF */
66
65
67
66
#define BUFFER_SIZE 256
68
69
#define PDIR "/lib/mandos/plugins.d"
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
72
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";
73
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
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
75
86
typedef struct plugin{
76
87
char *name; /* can be NULL or any plugin name */
77
88
char **argv;
79
90
char **environ;
80
91
int envc;
81
92
bool disabled;
82
83
/* Variables used for running processes*/
84
pid_t pid;
85
int fd;
86
char *buffer;
87
size_t buffer_size;
88
size_t buffer_length;
89
bool eof;
90
volatile bool completed;
91
volatile int status;
92
93
struct plugin *next;
93
94
} plugin;
94
95
95
static plugin *plugin_list = NULL;
96
97
/* Gets an existing plugin based on name,
98
or if none is found, creates a new one */
99
static plugin *getplugin(char *name){
100
/* Check for exiting plugin with that name */
101
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){
102
98
if ((p->name == name)
103
99
or (p->name and name and (strcmp(p->name, name) == 0))){
104
100
return p;
119
115
120
116
*new_plugin = (plugin) { .name = copy_name,
121
117
.argc = 1,
118
.envc = 0,
122
119
.disabled = false,
123
.next = plugin_list };
120
.next = *plugin_list };
124
121
125
122
new_plugin->argv = malloc(sizeof(char *) * 2);
126
123
if (new_plugin->argv == NULL){
130
127
}
131
128
new_plugin->argv[0] = copy_name;
132
129
new_plugin->argv[1] = NULL;
133
130
134
131
new_plugin->environ = malloc(sizeof(char *));
135
132
if(new_plugin->environ == NULL){
136
133
free(copy_name);
139
136
return NULL;
140
137
}
141
138
new_plugin->environ[0] = NULL;
142
143
139
/* Append the new plugin to the list */
144
plugin_list = new_plugin;
140
*plugin_list = new_plugin;
145
141
return new_plugin;
146
142
}
147
143
177
173
}
178
174
179
175
/* Add to a plugin's environment */
180
static bool add_environment(plugin *p, const char *def, bool replace){
176
static bool add_environment(plugin *p, const char *def){
181
177
if(p == NULL){
182
178
return false;
183
179
}
184
/* namelen = length of name of environment variable */
185
size_t namelen = (size_t)(strchrnul(def, '=') - def);
186
/* Search for this environment variable */
187
for(char **e = p->environ; *e != NULL; e++){
188
if(strncmp(*e, def, namelen + 1) == 0){
189
/* It already exists */
190
if(replace){
191
char *new = realloc(*e, strlen(def) + 1);
192
if(new == NULL){
193
return false;
194
}
195
*e = new;
196
strcpy(*e, def);
197
}
198
return true;
199
}
200
}
201
180
return add_to_char_array(def, &(p->environ), &(p->envc));
202
181
}
203
182
183
204
184
/*
205
185
* Based on the example in the GNU LibC manual chapter 13.13 "File
206
186
* Descriptor Flags".
207
187
* *Note File Descriptor Flags:(libc)Descriptor Flags.
208
188
*/
209
static int set_cloexec_flag(int fd){
189
static int set_cloexec_flag(int fd)
190
{
210
191
int ret = fcntl(fd, F_GETFD, 0);
211
192
/* If reading the flags failed, return error indication now. */
212
193
if(ret < 0){
216
197
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
217
198
}
218
199
200
process *process_list = NULL;
219
201
220
/* Mark processes as completed when they exit, and save their exit
202
/* Mark processes as completed when it exits, and save its exit
221
203
status. */
222
static void handle_sigchld(__attribute__((unused)) int sig){
204
void handle_sigchld(__attribute__((unused)) int sig){
205
process *proc = process_list;
223
206
while(true){
224
plugin *proc = plugin_list;
225
207
int status;
226
208
pid_t pid = waitpid(-1, &status, WNOHANG);
227
209
if(pid == 0){
228
/* Only still running child processes */
229
210
break;
230
211
}
231
212
if(pid == -1){
232
213
if (errno != ECHILD){
233
214
perror("waitpid");
234
215
}
235
/* No child processes */
236
break;
216
return;
237
217
}
238
239
/* A child exited, find it in process_list */
218
240
219
while(proc != NULL and proc->pid != pid){
241
220
proc = proc->next;
242
221
}
249
228
}
250
229
}
251
230
252
/* Prints out a password to stdout */
253
static bool print_out_password(const char *buffer, size_t length){
231
bool print_out_password(const char *buffer, size_t length){
254
232
ssize_t ret;
233
if(length>0 and buffer[length-1] == '\n'){
234
length--;
235
}
255
236
for(size_t written = 0; written < length; written += (size_t)ret){
256
237
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
257
238
length - written));
262
243
return true;
263
244
}
264
245
265
/* Removes and free a plugin from the plugin list */
266
static void free_plugin(plugin *plugin_node){
267
268
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
269
free(*arg);
270
}
271
free(plugin_node->argv);
272
for(char **env = plugin_node->environ; *env != NULL; env++){
273
free(*env);
274
}
275
free(plugin_node->environ);
276
free(plugin_node->buffer);
277
278
/* Removes the plugin from the singly-linked list */
279
if(plugin_node == plugin_list){
280
/* First one - simple */
281
plugin_list = plugin_list->next;
282
} else {
283
/* Second one or later */
284
for(plugin *p = plugin_list; p != NULL; p = p->next){
285
if(p->next == plugin_node){
286
p->next = plugin_node->next;
287
break;
288
}
246
char **add_to_argv(char **argv, int *argc, char *arg){
247
if (argv == NULL){
248
*argc = 1;
249
argv = malloc(sizeof(char*) * 2);
250
if(argv == NULL){
251
return NULL;
289
252
}
290
}
291
292
free(plugin_node);
253
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
254
argv[1] = NULL;
255
}
256
*argc += 1;
257
argv = realloc(argv, sizeof(char *)
258
* ((unsigned int) *argc + 1));
259
if(argv == NULL){
260
return NULL;
261
}
262
argv[*argc-1] = arg;
263
argv[*argc] = NULL;
264
return argv;
293
265
}
294
266
295
static void free_plugin_list(void){
296
while(plugin_list != NULL){
297
free_plugin(plugin_list);
267
static void free_plugin_list(plugin *plugin_list){
268
for(plugin *next; plugin_list != NULL; plugin_list = next){
269
next = plugin_list->next;
270
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
271
free(*arg);
272
}
273
free(plugin_list->argv);
274
for(char **env = plugin_list->environ; *env != NULL; env++){
275
free(*env);
276
}
277
free(plugin_list->environ);
278
free(plugin_list);
298
279
}
299
280
}
300
281
301
282
int main(int argc, char *argv[]){
302
char *plugindir = NULL;
303
char *argfile = NULL;
283
const char *plugindir = "/lib/mandos/plugins.d";
284
const char *argfile = ARGFILE;
304
285
FILE *conffp;
305
286
size_t d_name_len;
306
287
DIR *dir = NULL;
338
319
{ .name = "global-options", .key = 'g',
339
320
.arg = "OPTION[,OPTION[,...]]",
340
321
.doc = "Options passed to all plugins" },
341
{ .name = "global-env", .key = 'G',
322
{ .name = "global-envs", .key = 'e',
342
323
.arg = "VAR=value",
343
324
.doc = "Environment variable passed to all plugins" },
344
325
{ .name = "options-for", .key = 'o',
345
326
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
346
327
.doc = "Options passed only to specified plugin" },
347
{ .name = "env-for", .key = 'E',
328
{ .name = "envs-for", .key = 'f',
348
329
.arg = "PLUGIN:ENV=value",
349
330
.doc = "Environment variable passed to specified plugin" },
350
331
{ .name = "disable", .key = 'd',
351
332
.arg = "PLUGIN",
352
333
.doc = "Disable a specific plugin", .group = 1 },
353
{ .name = "enable", .key = 'e',
354
.arg = "PLUGIN",
355
.doc = "Enable a specific plugin", .group = 1 },
356
334
{ .name = "plugin-dir", .key = 128,
357
335
.arg = "DIRECTORY",
358
336
.doc = "Specify a different plugin directory", .group = 2 },
359
{ .name = "config-file", .key = 129,
360
.arg = "FILE",
361
.doc = "Specify a different configuration file", .group = 2 },
362
{ .name = "userid", .key = 130,
363
.arg = "ID", .flags = 0,
364
.doc = "User ID the plugins will run as", .group = 3 },
365
{ .name = "groupid", .key = 131,
366
.arg = "ID", .flags = 0,
367
.doc = "Group ID the plugins will run as", .group = 3 },
368
{ .name = "debug", .key = 132,
369
.doc = "Debug mode", .group = 4 },
337
{ .name = "userid", .key = 129,
338
.arg = "ID", .flags = 0,
339
.doc = "User ID the plugins will run as", .group = 2 },
340
{ .name = "groupid", .key = 130,
341
.arg = "ID", .flags = 0,
342
.doc = "Group ID the plugins will run as", .group = 2 },
343
{ .name = "debug", .key = 131,
344
.doc = "Debug mode", .group = 3 },
370
345
{ .name = NULL }
371
346
};
372
347
373
error_t parse_opt (int key, char *arg, __attribute__((unused))
374
struct argp_state *state) {
348
error_t parse_opt (int key, char *arg, struct argp_state *state) {
349
/* Get the INPUT argument from `argp_parse', which we know is a
350
pointer to our plugin list pointer. */
351
plugin **plugins = state->input;
375
352
switch (key) {
376
case 'g': /* --global-options */
353
case 'g':
377
354
if (arg != NULL){
378
355
char *p;
379
356
while((p = strsep(&arg, ",")) != NULL){
380
357
if(p[0] == '\0'){
381
358
continue;
382
359
}
383
if(not add_argument(getplugin(NULL), p)){
360
if(not add_argument(getplugin(NULL, plugins), p)){
384
361
perror("add_argument");
385
362
return ARGP_ERR_UNKNOWN;
386
363
}
387
364
}
388
365
}
389
366
break;
390
case 'G': /* --global-env */
367
case 'e':
391
368
if(arg == NULL){
392
369
break;
393
370
}
394
if(not add_environment(getplugin(NULL), arg, true)){
395
perror("add_environment");
371
{
372
char *envdef = strdup(arg);
373
if(envdef == NULL){
374
break;
375
}
376
if(not add_environment(getplugin(NULL, plugins), envdef)){
377
perror("add_environment");
378
}
396
379
}
397
380
break;
398
case 'o': /* --options-for */
381
case 'o':
399
382
if (arg != NULL){
400
383
char *p_name = strsep(&arg, ":");
401
if(p_name[0] == '\0' or arg == NULL){
384
if(p_name[0] == '\0'){
402
385
break;
403
386
}
404
387
char *opt = strsep(&arg, ":");
405
if(opt[0] == '\0' or opt == NULL){
388
if(opt[0] == '\0'){
406
389
break;
407
390
}
408
char *p;
409
while((p = strsep(&opt, ",")) != NULL){
410
if(p[0] == '\0'){
411
continue;
412
}
413
if(not add_argument(getplugin(p_name), p)){
414
perror("add_argument");
415
return ARGP_ERR_UNKNOWN;
391
if(opt != NULL){
392
char *p;
393
while((p = strsep(&opt, ",")) != NULL){
394
if(p[0] == '\0'){
395
continue;
396
}
397
if(not add_argument(getplugin(p_name, plugins), p)){
398
perror("add_argument");
399
return ARGP_ERR_UNKNOWN;
400
}
416
401
}
417
402
}
418
403
}
419
404
break;
420
case 'E': /* --env-for */
405
case 'f':
421
406
if(arg == NULL){
422
407
break;
423
408
}
426
411
if(envdef == NULL){
427
412
break;
428
413
}
429
*envdef = '\0';
430
if(not add_environment(getplugin(arg), envdef+1, true)){
414
char *p_name = strndup(arg, (size_t) (envdef-arg));
415
if(p_name == NULL){
416
break;
417
}
418
envdef++;
419
if(not add_environment(getplugin(p_name, plugins), envdef)){
431
420
perror("add_environment");
432
421
}
433
422
}
434
423
break;
435
case 'd': /* --disable */
424
case 'd':
436
425
if (arg != NULL){
437
plugin *p = getplugin(arg);
426
plugin *p = getplugin(arg, plugins);
438
427
if(p == NULL){
439
428
return ARGP_ERR_UNKNOWN;
440
429
}
441
430
p->disabled = true;
442
431
}
443
432
break;
444
case 'e': /* --enable */
445
if (arg != NULL){
446
plugin *p = getplugin(arg);
447
if(p == NULL){
448
return ARGP_ERR_UNKNOWN;
449
}
450
p->disabled = false;
451
}
452
break;
453
case 128: /* --plugin-dir */
454
free(plugindir);
455
plugindir = strdup(arg);
456
if(plugindir == NULL){
457
perror("strdup");
458
}
459
break;
460
case 129: /* --config-file */
461
/* This is already done by parse_opt_config_file() */
462
break;
463
case 130: /* --userid */
433
case 128:
434
plugindir = arg;
435
break;
436
case 129:
464
437
uid = (uid_t)strtol(arg, NULL, 10);
465
438
break;
466
case 131: /* --groupid */
439
case 130:
467
440
gid = (gid_t)strtol(arg, NULL, 10);
468
441
break;
469
case 132: /* --debug */
442
case 131:
470
443
debug = true;
471
444
break;
472
445
case ARGP_KEY_ARG:
473
/* Cryptsetup always passes an argument, which is an empty
474
string if "none" was specified in /etc/crypttab. So if
475
argument was empty, we ignore it silently. */
476
if(arg[0] != '\0'){
477
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
478
}
479
break;
480
case ARGP_KEY_END:
481
break;
482
default:
483
return ARGP_ERR_UNKNOWN;
484
}
485
return 0;
486
}
487
488
/* This option parser is the same as parse_opt() above, except it
489
ignores everything but the --config-file option. */
490
error_t parse_opt_config_file (int key, char *arg,
491
__attribute__((unused))
492
struct argp_state *state) {
493
switch (key) {
494
case 'g': /* --global-options */
495
case 'G': /* --global-env */
496
case 'o': /* --options-for */
497
case 'E': /* --env-for */
498
case 'd': /* --disable */
499
case 'e': /* --enable */
500
case 128: /* --plugin-dir */
501
break;
502
case 129: /* --config-file */
503
free(argfile);
504
argfile = strdup(arg);
505
if(argfile == NULL){
506
perror("strdup");
507
}
508
break;
509
case 130: /* --userid */
510
case 131: /* --groupid */
511
case 132: /* --debug */
512
case ARGP_KEY_ARG:
513
case ARGP_KEY_END:
514
break;
515
default:
516
return ARGP_ERR_UNKNOWN;
517
}
518
return 0;
519
}
520
521
struct argp argp = { .options = options,
522
.parser = parse_opt_config_file,
523
.args_doc = "",
446
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
447
break;
448
case ARGP_KEY_END:
449
break;
450
default:
451
return ARGP_ERR_UNKNOWN;
452
}
453
return 0;
454
}
455
456
plugin *plugin_list = NULL;
457
458
struct argp argp = { .options = options, .parser = parse_opt,
459
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
524
460
.doc = "Mandos plugin runner -- Run plugins" };
525
461
526
/* Parse using the parse_opt_config_file in order to get the custom
527
config file location, if any. */
528
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
462
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
529
463
if (ret == ARGP_ERR_UNKNOWN){
530
464
fprintf(stderr, "Unknown error while parsing arguments\n");
531
465
exitstatus = EXIT_FAILURE;
532
466
goto fallback;
533
467
}
534
535
/* Reset to the normal argument parser */
536
argp.parser = parse_opt;
537
538
/* Open the configfile if available */
539
if (argfile == NULL){
540
conffp = fopen(AFILE, "r");
541
} else {
542
conffp = fopen(argfile, "r");
543
}
468
469
conffp = fopen(argfile, "r");
544
470
if(conffp != NULL){
545
471
char *org_line = NULL;
546
472
char *p, *arg, *new_arg, *line;
549
475
const char whitespace_delims[] = " \r\t\f\v\n";
550
476
const char comment_delim[] = "#";
551
477
552
custom_argc = 1;
553
custom_argv = malloc(sizeof(char*) * 2);
554
if(custom_argv == NULL){
555
perror("malloc");
556
exitstatus = EXIT_FAILURE;
557
goto fallback;
558
}
559
custom_argv[0] = argv[0];
560
custom_argv[1] = NULL;
561
562
/* for each line in the config file, strip whitespace and ignore
563
commented text */
564
478
while(true){
565
479
sret = getline(&org_line, &size, conffp);
566
480
if(sret == -1){
574
488
continue;
575
489
}
576
490
new_arg = strdup(p);
577
if(new_arg == NULL){
578
perror("strdup");
579
exitstatus = EXIT_FAILURE;
580
free(org_line);
581
goto fallback;
582
}
583
584
custom_argc += 1;
585
custom_argv = realloc(custom_argv, sizeof(char *)
586
* ((unsigned int) custom_argc + 1));
587
if(custom_argv == NULL){
588
perror("realloc");
589
exitstatus = EXIT_FAILURE;
590
free(org_line);
591
goto fallback;
592
}
593
custom_argv[custom_argc-1] = new_arg;
594
custom_argv[custom_argc] = NULL;
491
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
492
if (custom_argv == NULL){
493
perror("add_to_argv");
494
exitstatus = EXIT_FAILURE;
495
goto fallback;
496
}
595
497
}
596
498
}
597
499
free(org_line);
598
} else {
500
} else{
599
501
/* Check for harmful errors and go to fallback. Other errors might
600
502
not affect opening plugins */
601
503
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
604
506
goto fallback;
605
507
}
606
508
}
607
/* If there was any arguments from configuration file,
608
pass them to parser as command arguments */
509
609
510
if(custom_argv != NULL){
610
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
611
0, NULL);
511
custom_argv[0] = argv[0];
512
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
612
513
if (ret == ARGP_ERR_UNKNOWN){
613
514
fprintf(stderr, "Unknown error while parsing arguments\n");
614
515
exitstatus = EXIT_FAILURE;
616
517
}
617
518
}
618
519
619
/* Parse actual command line arguments, to let them override the
620
config file */
621
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
622
if (ret == ARGP_ERR_UNKNOWN){
623
fprintf(stderr, "Unknown error while parsing arguments\n");
624
exitstatus = EXIT_FAILURE;
625
goto fallback;
626
}
627
628
520
if(debug){
629
521
for(plugin *p = plugin_list; p != NULL; p=p->next){
630
522
fprintf(stderr, "Plugin: %s has %d arguments\n",
639
531
}
640
532
}
641
533
642
/* Strip permissions down to nobody */
643
534
ret = setuid(uid);
644
535
if (ret == -1){
645
536
perror("setuid");
646
}
537
}
538
647
539
setgid(gid);
648
540
if (ret == -1){
649
541
perror("setgid");
650
542
}
651
543
652
if (plugindir == NULL){
653
dir = opendir(PDIR);
654
} else {
655
dir = opendir(plugindir);
656
}
657
544
dir = opendir(plugindir);
658
545
if(dir == NULL){
659
546
perror("Could not open plugin dir");
660
547
exitstatus = EXIT_FAILURE;
676
563
677
564
FD_ZERO(&rfds_all);
678
565
679
/* Read and execute any executable in the plugin directory*/
680
566
while(true){
681
567
dirst = readdir(dir);
682
568
683
/* All directory entries have been processed */
569
// All directory entries have been processed
684
570
if(dirst == NULL){
685
571
if (errno == EBADF){
686
572
perror("readdir");
692
578
693
579
d_name_len = strlen(dirst->d_name);
694
580
695
/* Ignore dotfiles, backup files and other junk */
581
// Ignore dotfiles, backup files and other junk
696
582
{
697
583
bool bad_name = false;
698
584
713
599
break;
714
600
}
715
601
}
602
716
603
if(bad_name){
717
604
continue;
718
605
}
606
719
607
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
720
608
size_t suf_len = strlen(*suf);
721
609
if((d_name_len >= suf_len)
736
624
}
737
625
738
626
char *filename;
739
if(plugindir == NULL){
740
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
741
} else {
742
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
743
}
627
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
744
628
if(ret < 0){
745
629
perror("asprintf");
746
630
continue;
752
636
free(filename);
753
637
continue;
754
638
}
755
756
/* Ignore non-executable files */
639
757
640
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
758
641
if(debug){
759
642
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
762
645
free(filename);
763
646
continue;
764
647
}
765
766
plugin *p = getplugin(dirst->d_name);
648
plugin *p = getplugin(dirst->d_name, &plugin_list);
767
649
if(p == NULL){
768
650
perror("getplugin");
769
651
free(filename);
779
661
}
780
662
{
781
663
/* Add global arguments to argument list for this plugin */
782
plugin *g = getplugin(NULL);
664
plugin *g = getplugin(NULL, &plugin_list);
783
665
if(g != NULL){
784
666
for(char **a = g->argv + 1; *a != NULL; a++){
785
667
if(not add_argument(p, *a)){
788
670
}
789
671
/* Add global environment variables */
790
672
for(char **e = g->environ; *e != NULL; e++){
791
if(not add_environment(p, *e, false)){
673
if(not add_environment(p, *e)){
792
674
perror("add_environment");
793
675
}
794
676
}
799
681
process, too. */
800
682
if(p->environ[0] != NULL){
801
683
for(char **e = environ; *e != NULL; e++){
802
if(not add_environment(p, *e, false)){
684
char *copy = strdup(*e);
685
if(copy == NULL){
686
perror("strdup");
687
continue;
688
}
689
if(not add_environment(p, copy)){
803
690
perror("add_environment");
804
691
}
805
692
}
812
699
exitstatus = EXIT_FAILURE;
813
700
goto fallback;
814
701
}
815
/* Ask OS to automatic close the pipe on exec */
816
702
ret = set_cloexec_flag(pipefd[0]);
817
703
if(ret < 0){
818
704
perror("set_cloexec_flag");
832
718
exitstatus = EXIT_FAILURE;
833
719
goto fallback;
834
720
}
835
/* Starting a new process to be watched */
721
// Starting a new process to be watched
836
722
pid_t pid = fork();
837
723
if(pid == -1){
838
724
perror("fork");
846
732
perror("sigaction");
847
733
_exit(EXIT_FAILURE);
848
734
}
849
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
735
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
850
736
if(ret < 0){
851
737
perror("sigprocmask");
852
738
_exit(EXIT_FAILURE);
853
739
}
854
740
855
741
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
856
742
if(ret == -1){
857
743
perror("dup2");
876
762
}
877
763
/* no return */
878
764
}
879
/* Parent process */
880
close(pipefd[1]); /* Close unused write end of pipe */
765
/* parent process */
881
766
free(filename);
882
plugin *new_plugin = getplugin(dirst->d_name);
883
if (new_plugin == NULL){
884
perror("getplugin");
767
close(pipefd[1]); /* close unused write end of pipe */
768
process *new_process = malloc(sizeof(process));
769
if (new_process == NULL){
770
perror("malloc");
885
771
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
886
772
if(ret < 0){
887
perror("sigprocmask");
773
perror("sigprocmask");
888
774
}
889
775
exitstatus = EXIT_FAILURE;
890
776
goto fallback;
891
777
}
892
778
893
new_plugin->pid = pid;
894
new_plugin->fd = pipefd[0];
895
779
*new_process = (struct process){ .pid = pid,
780
.fd = pipefd[0],
781
.next = process_list };
782
// List handling
783
process_list = new_process;
896
784
/* Unblock SIGCHLD so signal handler can be run if this process
897
785
has already completed */
898
786
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
902
790
goto fallback;
903
791
}
904
792
905
FD_SET(new_plugin->fd, &rfds_all);
793
FD_SET(new_process->fd, &rfds_all);
906
794
907
if (maxfd < new_plugin->fd){
908
maxfd = new_plugin->fd;
795
if (maxfd < new_process->fd){
796
maxfd = new_process->fd;
909
797
}
798
910
799
}
911
800
801
free_plugin_list(plugin_list);
802
plugin_list = NULL;
803
912
804
closedir(dir);
913
805
dir = NULL;
914
915
for(plugin *p = plugin_list; p != NULL; p = p->next){
916
if(p->pid != 0){
917
break;
918
}
919
if(p->next == NULL){
920
fprintf(stderr, "No plugin processes started. Incorrect plugin"
921
" directory?\n");
922
free_plugin_list();
923
}
806
807
if (process_list == NULL){
808
fprintf(stderr, "No plugin processes started. Incorrect plugin"
809
" directory?\n");
810
process_list = NULL;
924
811
}
925
926
/* Main loop while running plugins exist */
927
while(plugin_list){
812
while(process_list){
928
813
fd_set rfds = rfds_all;
929
814
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
930
815
if (select_ret == -1){
934
819
}
935
820
/* OK, now either a process completed, or something can be read
936
821
from one of them */
937
for(plugin *proc = plugin_list; proc != NULL;){
822
for(process *proc = process_list; proc ; proc = proc->next){
938
823
/* Is this process completely done? */
939
824
if(proc->eof and proc->completed){
940
825
/* Only accept the plugin output if it exited cleanly */
941
826
if(not WIFEXITED(proc->status)
942
827
or WEXITSTATUS(proc->status) != 0){
943
828
/* Bad exit by plugin */
944
945
829
if(debug){
946
830
if(WIFEXITED(proc->status)){
947
831
fprintf(stderr, "Plugin %u exited with status %d\n",
956
840
(unsigned int) (proc->pid));
957
841
}
958
842
}
959
960
843
/* Remove the plugin */
961
844
FD_CLR(proc->fd, &rfds_all);
962
963
845
/* Block signal while modifying process_list */
964
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
846
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
965
847
if(ret < 0){
966
848
perror("sigprocmask");
967
849
exitstatus = EXIT_FAILURE;
968
850
goto fallback;
969
851
}
970
971
plugin *next_plugin = proc->next;
972
free_plugin(proc);
973
proc = next_plugin;
974
852
/* Delete this process entry from the list */
853
if(process_list == proc){
854
/* First one - simple */
855
process_list = proc->next;
856
} else {
857
/* Second one or later */
858
for(process *p = process_list; p != NULL; p = p->next){
859
if(p->next == proc){
860
p->next = proc->next;
861
break;
862
}
863
}
864
}
975
865
/* We are done modifying process list, so unblock signal */
976
866
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
977
867
NULL);
978
868
if(ret < 0){
979
869
perror("sigprocmask");
980
exitstatus = EXIT_FAILURE;
981
goto fallback;
982
}
983
984
if(plugin_list == NULL){
985
break;
986
}
987
988
continue;
870
}
871
free(proc->buffer);
872
free(proc);
873
/* We deleted this process from the list, so we can't go
874
proc->next. Therefore, start over from the beginning of
875
the process list */
876
break;
989
877
}
990
991
878
/* This process exited nicely, so print its buffer */
992
993
bool bret = print_out_password(proc->buffer,
994
proc->buffer_length);
879
880
bool bret = print_out_password(proc->buffer, proc->buffer_length);
995
881
if(not bret){
996
882
perror("print_out_password");
997
883
exitstatus = EXIT_FAILURE;
998
884
}
999
885
goto fallback;
1000
886
}
1001
1002
887
/* This process has not completed. Does it have any output? */
1003
888
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1004
889
/* This process had nothing to say at this time */
1005
proc = proc->next;
1006
890
continue;
1007
891
}
1008
892
/* Before reading, make the process' data buffer large enough */
1021
905
BUFFER_SIZE);
1022
906
if(ret < 0){
1023
907
/* Read error from this process; ignore the error */
1024
proc = proc->next;
1025
908
continue;
1026
909
}
1027
910
if(ret == 0){
1036
919
1037
920
fallback:
1038
921
1039
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1040
/* Fallback if all plugins failed, none are found or an error
1041
occured */
922
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
923
/* Fallback if all plugins failed, none are found or an error occured */
1042
924
bool bret;
1043
925
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1044
926
char *passwordbuffer = getpass("Password: ");
1045
size_t len = strlen(passwordbuffer);
1046
/* Strip trailing newline */
1047
if(len > 0 and passwordbuffer[len-1] == '\n'){
1048
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1049
len--;
1050
}
1051
bret = print_out_password(passwordbuffer, len);
927
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1052
928
if(not bret){
1053
929
perror("print_out_password");
1054
930
exitstatus = EXIT_FAILURE;
1061
937
perror("sigaction");
1062
938
exitstatus = EXIT_FAILURE;
1063
939
}
1064
940
1065
941
if(custom_argv != NULL){
1066
for(char **arg = custom_argv+1; *arg != NULL; arg++){
942
for(char **arg = custom_argv; *arg != NULL; arg++){
1067
943
free(*arg);
1068
944
}
1069
945
free(custom_argv);
1070
946
}
947
free_plugin_list(plugin_list);
1071
948
1072
949
if(dir != NULL){
1073
950
closedir(dir);
1074
951
}
1075
952
1076
/* Kill the processes */
1077
for(plugin *p = plugin_list; p != NULL; p = p->next){
1078
if(p->pid != 0){
1079
close(p->fd);
1080
ret = kill(p->pid, SIGTERM);
1081
if(ret == -1 and errno != ESRCH){
1082
/* Set-uid proccesses might not get closed */
1083
perror("kill");
1084
}
953
/* Free the process list and kill the processes */
954
for(process *next; process_list != NULL; process_list = next){
955
next = process_list->next;
956
close(process_list->fd);
957
ret = kill(process_list->pid, SIGTERM);
958
if(ret == -1 and errno != ESRCH){
959
/* set-uid proccesses migth not get closed */
960
perror("kill");
1085
961
}
962
free(process_list->buffer);
963
free(process_list);
1086
964
}
1087
965
1088
966
/* Wait for any remaining child processes to terminate */
1093
971
perror("wait");
1094
972
}
1095
973
1096
free_plugin_list();
1097
1098
free(plugindir);
1099
free(argfile);
1100
1101
974
return exitstatus;
1102
975
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0