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- Committer: Teddy Hogeborn
- Date: 2008-09-05 18:37:28 UTC
- Revision ID: teddy@fukt.bsnet.se-20080905183728-l0m8v3vqa302uwrw
* mandos (main): Use EAFP with pidfile.
added
removed
plugin-runner.c
96
96
97
97
static plugin *plugin_list = NULL;
98
98
99
/* Gets a existing plugin based on name,
99
/* Gets an existing plugin based on name,
100
100
or if none is found, creates a new one */
101
101
static plugin *getplugin(char *name){
102
102
/* Check for exiting plugin with that name */
118
118
return NULL;
119
119
}
120
120
}
121
121
122
122
*new_plugin = (plugin) { .name = copy_name,
123
123
.argc = 1,
124
124
.disabled = false,
132
132
}
133
133
new_plugin->argv[0] = copy_name;
134
134
new_plugin->argv[1] = NULL;
135
135
136
136
new_plugin->environ = malloc(sizeof(char *));
137
137
if(new_plugin->environ == NULL){
138
138
free(copy_name);
141
141
return NULL;
142
142
}
143
143
new_plugin->environ[0] = NULL;
144
144
145
145
/* Append the new plugin to the list */
146
146
plugin_list = new_plugin;
147
147
return new_plugin;
179
179
}
180
180
181
181
/* Add to a plugin's environment */
182
static bool add_environment(plugin *p, const char *def){
182
static bool add_environment(plugin *p, const char *def, bool replace){
183
183
if(p == NULL){
184
184
return false;
185
185
}
186
/* namelen = length of name of environment variable */
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen + 1) == 0){
191
/* It already exists */
192
if(replace){
193
char *new = realloc(*e, strlen(def) + 1);
194
if(new == NULL){
195
return false;
196
}
197
*e = new;
198
strcpy(*e, def);
199
}
200
return true;
201
}
202
}
186
203
return add_to_char_array(def, &(p->environ), &(p->envc));
187
204
}
188
205
221
238
/* No child processes */
222
239
break;
223
240
}
224
241
225
242
/* A child exited, find it in process_list */
226
243
while(proc != NULL and proc->pid != pid){
227
244
proc = proc->next;
327
344
{ .name = "global-options", .key = 'g',
328
345
.arg = "OPTION[,OPTION[,...]]",
329
346
.doc = "Options passed to all plugins" },
330
{ .name = "global-envs", .key = 'e',
347
{ .name = "global-env", .key = 'G',
331
348
.arg = "VAR=value",
332
349
.doc = "Environment variable passed to all plugins" },
333
350
{ .name = "options-for", .key = 'o',
334
351
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
335
352
.doc = "Options passed only to specified plugin" },
336
{ .name = "envs-for", .key = 'f',
353
{ .name = "env-for", .key = 'E',
337
354
.arg = "PLUGIN:ENV=value",
338
355
.doc = "Environment variable passed to specified plugin" },
339
356
{ .name = "disable", .key = 'd',
340
357
.arg = "PLUGIN",
341
358
.doc = "Disable a specific plugin", .group = 1 },
359
{ .name = "enable", .key = 'e',
360
.arg = "PLUGIN",
361
.doc = "Enable a specific plugin", .group = 1 },
342
362
{ .name = "plugin-dir", .key = 128,
343
363
.arg = "DIRECTORY",
344
364
.doc = "Specify a different plugin directory", .group = 2 },
356
376
{ .name = NULL }
357
377
};
358
378
359
error_t parse_opt (int key, char *arg, __attribute__((unused)) struct argp_state *state) {
360
/* Get the INPUT argument from `argp_parse', which we know is a
361
pointer to our plugin list pointer. */
379
error_t parse_opt (int key, char *arg, __attribute__((unused))
380
struct argp_state *state) {
362
381
switch (key) {
363
382
case 'g': /* --global-options */
364
383
if (arg != NULL){
374
393
}
375
394
}
376
395
break;
377
case 'e': /* --global-envs */
396
case 'G': /* --global-env */
378
397
if(arg == NULL){
379
398
break;
380
399
}
383
402
if(envdef == NULL){
384
403
break;
385
404
}
386
if(not add_environment(getplugin(NULL), envdef)){
405
if(not add_environment(getplugin(NULL), envdef, true)){
387
406
perror("add_environment");
388
407
}
389
408
}
391
410
case 'o': /* --options-for */
392
411
if (arg != NULL){
393
412
char *p_name = strsep(&arg, ":");
394
if(p_name[0] == '\0'){
413
if(p_name[0] == '\0' or arg == NULL){
395
414
break;
396
415
}
397
416
char *opt = strsep(&arg, ":");
398
if(opt[0] == '\0'){
417
if(opt[0] == '\0' or opt == NULL){
399
418
break;
400
419
}
401
if(opt != NULL){
402
char *p;
403
while((p = strsep(&opt, ",")) != NULL){
404
if(p[0] == '\0'){
405
continue;
406
}
407
if(not add_argument(getplugin(p_name), p)){
408
perror("add_argument");
409
return ARGP_ERR_UNKNOWN;
410
}
420
char *p;
421
while((p = strsep(&opt, ",")) != NULL){
422
if(p[0] == '\0'){
423
continue;
424
}
425
if(not add_argument(getplugin(p_name), p)){
426
perror("add_argument");
427
return ARGP_ERR_UNKNOWN;
411
428
}
412
429
}
413
430
}
414
431
break;
415
case 'f': /* --envs-for */
432
case 'E': /* --env-for */
416
433
if(arg == NULL){
417
434
break;
418
435
}
426
443
break;
427
444
}
428
445
envdef++;
429
if(not add_environment(getplugin(p_name), envdef)){
446
if(not add_environment(getplugin(p_name), envdef, true)){
430
447
perror("add_environment");
431
448
}
432
449
}
440
457
p->disabled = true;
441
458
}
442
459
break;
460
case 'e': /* --enable */
461
if (arg != NULL){
462
plugin *p = getplugin(arg);
463
if(p == NULL){
464
return ARGP_ERR_UNKNOWN;
465
}
466
p->disabled = false;
467
}
468
break;
443
469
case 128: /* --plugin-dir */
444
470
plugindir = strdup(arg);
445
471
if(plugindir == NULL){
447
473
}
448
474
break;
449
475
case 129: /* --config-file */
450
argfile = strdup(arg);
451
if(argfile == NULL){
452
perror("strdup");
453
}
454
break;
476
/* This is already done by parse_opt_config_file() */
477
break;
455
478
case 130: /* --userid */
456
479
uid = (uid_t)strtol(arg, NULL, 10);
457
480
break;
472
495
return 0;
473
496
}
474
497
475
struct argp argp = { .options = options, .parser = parse_opt,
476
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
498
/* This option parser is the same as parse_opt() above, except it
499
ignores everything but the --config-file option. */
500
error_t parse_opt_config_file (int key, char *arg,
501
__attribute__((unused))
502
struct argp_state *state) {
503
switch (key) {
504
case 'g': /* --global-options */
505
case 'G': /* --global-env */
506
case 'o': /* --options-for */
507
case 'E': /* --env-for */
508
case 'd': /* --disable */
509
case 'e': /* --enable */
510
case 128: /* --plugin-dir */
511
break;
512
case 129: /* --config-file */
513
argfile = strdup(arg);
514
if(argfile == NULL){
515
perror("strdup");
516
}
517
break;
518
case 130: /* --userid */
519
case 131: /* --groupid */
520
case 132: /* --debug */
521
case ARGP_KEY_ARG:
522
case ARGP_KEY_END:
523
break;
524
default:
525
return ARGP_ERR_UNKNOWN;
526
}
527
return 0;
528
}
529
530
struct argp argp = { .options = options,
531
.parser = parse_opt_config_file,
532
.args_doc = "",
477
533
.doc = "Mandos plugin runner -- Run plugins" };
478
534
479
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
535
/* Parse using the parse_opt_config_file in order to get the custom
536
config file location, if any. */
537
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
480
538
if (ret == ARGP_ERR_UNKNOWN){
481
539
fprintf(stderr, "Unknown error while parsing arguments\n");
482
540
exitstatus = EXIT_FAILURE;
483
541
goto fallback;
484
542
}
485
486
/* Opens the configfile if aviable */
543
544
/* Reset to the normal argument parser */
545
argp.parser = parse_opt;
546
547
/* Open the configfile if available */
487
548
if (argfile == NULL){
488
549
conffp = fopen(AFILE, "r");
489
550
} else {
507
568
custom_argv[0] = argv[0];
508
569
custom_argv[1] = NULL;
509
570
510
/* for each line in the config file, strip whitespace and ignore commented text */
571
/* for each line in the config file, strip whitespace and ignore
572
commented text */
511
573
while(true){
512
574
sret = getline(&org_line, &size, conffp);
513
575
if(sret == -1){
542
604
}
543
605
}
544
606
free(org_line);
545
} else{
607
} else {
546
608
/* Check for harmful errors and go to fallback. Other errors might
547
609
not affect opening plugins */
548
610
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
554
616
/* If there was any arguments from configuration file,
555
617
pass them to parser as command arguments */
556
618
if(custom_argv != NULL){
557
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, NULL);
619
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
620
0, NULL);
558
621
if (ret == ARGP_ERR_UNKNOWN){
559
622
fprintf(stderr, "Unknown error while parsing arguments\n");
560
623
exitstatus = EXIT_FAILURE;
562
625
}
563
626
}
564
627
628
/* Parse actual command line arguments, to let them override the
629
config file */
630
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
631
if (ret == ARGP_ERR_UNKNOWN){
632
fprintf(stderr, "Unknown error while parsing arguments\n");
633
exitstatus = EXIT_FAILURE;
634
goto fallback;
635
}
636
565
637
if(debug){
566
638
for(plugin *p = plugin_list; p != NULL; p=p->next){
567
639
fprintf(stderr, "Plugin: %s has %d arguments\n",
575
647
}
576
648
}
577
649
}
578
650
579
651
/* Strip permissions down to nobody */
580
652
ret = setuid(uid);
581
653
if (ret == -1){
585
657
if (ret == -1){
586
658
perror("setgid");
587
659
}
588
660
589
661
if (plugindir == NULL){
590
662
dir = opendir(PDIR);
591
663
} else {
612
684
}
613
685
614
686
FD_ZERO(&rfds_all);
615
687
616
688
/* Read and execute any executable in the plugin directory*/
617
689
while(true){
618
690
dirst = readdir(dir);
619
691
620
// All directory entries have been processed
692
/* All directory entries have been processed */
621
693
if(dirst == NULL){
622
694
if (errno == EBADF){
623
695
perror("readdir");
629
701
630
702
d_name_len = strlen(dirst->d_name);
631
703
632
// Ignore dotfiles, backup files and other junk
704
/* Ignore dotfiles, backup files and other junk */
633
705
{
634
706
bool bad_name = false;
635
707
721
793
}
722
794
/* Add global environment variables */
723
795
for(char **e = g->environ; *e != NULL; e++){
724
if(not add_environment(p, *e)){
796
if(not add_environment(p, *e, false)){
725
797
perror("add_environment");
726
798
}
727
799
}
732
804
process, too. */
733
805
if(p->environ[0] != NULL){
734
806
for(char **e = environ; *e != NULL; e++){
735
char *copy = strdup(*e);
736
if(copy == NULL){
737
perror("strdup");
738
continue;
739
}
740
if(not add_environment(p, copy)){
807
if(not add_environment(p, *e, false)){
741
808
perror("add_environment");
742
809
}
743
810
}
770
837
exitstatus = EXIT_FAILURE;
771
838
goto fallback;
772
839
}
773
// Starting a new process to be watched
840
/* Starting a new process to be watched */
774
841
pid_t pid = fork();
775
842
if(pid == -1){
776
843
perror("fork");
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