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- Committer: Björn Påhlsson
- Date: 2008-08-29 09:32:06 UTC
- mfrom: (114 mandos)
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 132.
- Revision ID: belorn@braxen-20080829093206-12p8xfyduzkpf618
merge
- 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:
- .bzrignore
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,
69
69
#define PDIR "/lib/mandos/plugins.d"
70
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
71
72
const char *argp_program_version = "plugin-runner " VERSION;
72
const char *argp_program_version = "plugin-runner 1.0";
73
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
74
75
typedef struct plugin{
76
char *name; /* can be NULL or any plugin name */
77
char **argv;
78
int argc;
79
char **environ;
80
int envc;
81
bool disabled;
75
struct process;
82
76
83
/* Variables used for running processes*/
77
typedef struct process{
84
78
pid_t pid;
85
79
int fd;
86
80
char *buffer;
89
83
bool eof;
90
84
volatile bool completed;
91
85
volatile int status;
86
struct process *next;
87
} process;
88
89
typedef struct plugin{
90
char *name; /* can be NULL or any plugin name */
91
char **argv;
92
int argc;
93
char **environ;
94
int envc;
95
bool disabled;
92
96
struct plugin *next;
93
97
} plugin;
94
98
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){
99
static plugin *getplugin(char *name, plugin **plugin_list){
100
for (plugin *p = *plugin_list; p != NULL; p = p->next){
102
101
if ((p->name == name)
103
102
or (p->name and name and (strcmp(p->name, name) == 0))){
104
103
return p;
119
118
120
119
*new_plugin = (plugin) { .name = copy_name,
121
120
.argc = 1,
121
.envc = 0,
122
122
.disabled = false,
123
.next = plugin_list };
123
.next = *plugin_list };
124
124
125
125
new_plugin->argv = malloc(sizeof(char *) * 2);
126
126
if (new_plugin->argv == NULL){
130
130
}
131
131
new_plugin->argv[0] = copy_name;
132
132
new_plugin->argv[1] = NULL;
133
133
134
134
new_plugin->environ = malloc(sizeof(char *));
135
135
if(new_plugin->environ == NULL){
136
136
free(copy_name);
139
139
return NULL;
140
140
}
141
141
new_plugin->environ[0] = NULL;
142
143
142
/* Append the new plugin to the list */
144
plugin_list = new_plugin;
143
*plugin_list = new_plugin;
145
144
return new_plugin;
146
145
}
147
146
177
176
}
178
177
179
178
/* Add to a plugin's environment */
180
static bool add_environment(plugin *p, const char *def, bool replace){
179
static bool add_environment(plugin *p, const char *def){
181
180
if(p == NULL){
182
181
return false;
183
182
}
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
183
return add_to_char_array(def, &(p->environ), &(p->envc));
202
184
}
203
185
186
204
187
/*
205
188
* Based on the example in the GNU LibC manual chapter 13.13 "File
206
189
* Descriptor Flags".
207
190
* *Note File Descriptor Flags:(libc)Descriptor Flags.
208
191
*/
209
static int set_cloexec_flag(int fd){
192
static int set_cloexec_flag(int fd)
193
{
210
194
int ret = fcntl(fd, F_GETFD, 0);
211
195
/* If reading the flags failed, return error indication now. */
212
196
if(ret < 0){
216
200
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
217
201
}
218
202
203
process *process_list = NULL;
219
204
220
205
/* Mark processes as completed when they exit, and save their exit
221
206
status. */
222
static void handle_sigchld(__attribute__((unused)) int sig){
207
void handle_sigchld(__attribute__((unused)) int sig){
223
208
while(true){
224
plugin *proc = plugin_list;
209
process *proc = process_list;
225
210
int status;
226
211
pid_t pid = waitpid(-1, &status, WNOHANG);
227
212
if(pid == 0){
235
220
/* No child processes */
236
221
break;
237
222
}
238
223
239
224
/* A child exited, find it in process_list */
240
225
while(proc != NULL and proc->pid != pid){
241
226
proc = proc->next;
249
234
}
250
235
}
251
236
252
/* Prints out a password to stdout */
253
static bool print_out_password(const char *buffer, size_t length){
237
bool print_out_password(const char *buffer, size_t length){
254
238
ssize_t ret;
239
if(length>0 and buffer[length-1] == '\n'){
240
length--;
241
}
255
242
for(size_t written = 0; written < length; written += (size_t)ret){
256
243
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
257
244
length - written));
262
249
return true;
263
250
}
264
251
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
}
289
}
290
}
291
292
free(plugin_node);
293
}
294
295
static void free_plugin_list(void){
296
while(plugin_list != NULL){
297
free_plugin(plugin_list);
252
static void free_plugin_list(plugin *plugin_list){
253
for(plugin *next; plugin_list != NULL; plugin_list = next){
254
next = plugin_list->next;
255
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
256
free(*arg);
257
}
258
free(plugin_list->argv);
259
for(char **env = plugin_list->environ; *env != NULL; env++){
260
free(*env);
261
}
262
free(plugin_list->environ);
263
free(plugin_list);
298
264
}
299
265
}
300
266
338
304
{ .name = "global-options", .key = 'g',
339
305
.arg = "OPTION[,OPTION[,...]]",
340
306
.doc = "Options passed to all plugins" },
341
{ .name = "global-env", .key = 'G',
307
{ .name = "global-envs", .key = 'e',
342
308
.arg = "VAR=value",
343
309
.doc = "Environment variable passed to all plugins" },
344
310
{ .name = "options-for", .key = 'o',
345
311
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
346
312
.doc = "Options passed only to specified plugin" },
347
{ .name = "env-for", .key = 'E',
313
{ .name = "envs-for", .key = 'f',
348
314
.arg = "PLUGIN:ENV=value",
349
315
.doc = "Environment variable passed to specified plugin" },
350
316
{ .name = "disable", .key = 'd',
351
317
.arg = "PLUGIN",
352
318
.doc = "Disable a specific plugin", .group = 1 },
353
{ .name = "enable", .key = 'e',
354
.arg = "PLUGIN",
355
.doc = "Enable a specific plugin", .group = 1 },
356
319
{ .name = "plugin-dir", .key = 128,
357
320
.arg = "DIRECTORY",
358
321
.doc = "Specify a different plugin directory", .group = 2 },
370
333
{ .name = NULL }
371
334
};
372
335
373
error_t parse_opt (int key, char *arg, __attribute__((unused))
374
struct argp_state *state) {
336
error_t parse_opt (int key, char *arg, struct argp_state *state) {
337
/* Get the INPUT argument from `argp_parse', which we know is a
338
pointer to our plugin list pointer. */
339
plugin **plugins = state->input;
375
340
switch (key) {
376
case 'g': /* --global-options */
341
case 'g':
377
342
if (arg != NULL){
378
343
char *p;
379
344
while((p = strsep(&arg, ",")) != NULL){
380
345
if(p[0] == '\0'){
381
346
continue;
382
347
}
383
if(not add_argument(getplugin(NULL), p)){
348
if(not add_argument(getplugin(NULL, plugins), p)){
384
349
perror("add_argument");
385
350
return ARGP_ERR_UNKNOWN;
386
351
}
387
352
}
388
353
}
389
354
break;
390
case 'G': /* --global-env */
355
case 'e':
391
356
if(arg == NULL){
392
357
break;
393
358
}
394
if(not add_environment(getplugin(NULL), arg, true)){
395
perror("add_environment");
359
{
360
char *envdef = strdup(arg);
361
if(envdef == NULL){
362
break;
363
}
364
if(not add_environment(getplugin(NULL, plugins), envdef)){
365
perror("add_environment");
366
}
396
367
}
397
368
break;
398
case 'o': /* --options-for */
369
case 'o':
399
370
if (arg != NULL){
400
371
char *p_name = strsep(&arg, ":");
401
if(p_name[0] == '\0' or arg == NULL){
372
if(p_name[0] == '\0'){
402
373
break;
403
374
}
404
375
char *opt = strsep(&arg, ":");
405
if(opt[0] == '\0' or opt == NULL){
376
if(opt[0] == '\0'){
406
377
break;
407
378
}
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;
379
if(opt != NULL){
380
char *p;
381
while((p = strsep(&opt, ",")) != NULL){
382
if(p[0] == '\0'){
383
continue;
384
}
385
if(not add_argument(getplugin(p_name, plugins), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
388
}
416
389
}
417
390
}
418
391
}
419
392
break;
420
case 'E': /* --env-for */
393
case 'f':
421
394
if(arg == NULL){
422
395
break;
423
396
}
426
399
if(envdef == NULL){
427
400
break;
428
401
}
429
*envdef = '\0';
430
if(not add_environment(getplugin(arg), envdef+1, true)){
402
char *p_name = strndup(arg, (size_t) (envdef-arg));
403
if(p_name == NULL){
404
break;
405
}
406
envdef++;
407
if(not add_environment(getplugin(p_name, plugins), envdef)){
431
408
perror("add_environment");
432
409
}
433
410
}
434
411
break;
435
case 'd': /* --disable */
412
case 'd':
436
413
if (arg != NULL){
437
plugin *p = getplugin(arg);
414
plugin *p = getplugin(arg, plugins);
438
415
if(p == NULL){
439
416
return ARGP_ERR_UNKNOWN;
440
417
}
441
418
p->disabled = true;
442
419
}
443
420
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);
421
case 128:
455
422
plugindir = strdup(arg);
456
423
if(plugindir == NULL){
457
424
perror("strdup");
458
425
}
459
426
break;
460
case 129: /* --config-file */
461
/* This is already done by parse_opt_config_file() */
462
break;
463
case 130: /* --userid */
427
case 129:
428
argfile = strdup(arg);
429
if(argfile == NULL){
430
perror("strdup");
431
}
432
break;
433
case 130:
464
434
uid = (uid_t)strtol(arg, NULL, 10);
465
435
break;
466
case 131: /* --groupid */
436
case 131:
467
437
gid = (gid_t)strtol(arg, NULL, 10);
468
438
break;
469
case 132: /* --debug */
439
case 132:
470
440
debug = true;
471
441
break;
472
442
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 = "",
443
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
444
break;
445
case ARGP_KEY_END:
446
break;
447
default:
448
return ARGP_ERR_UNKNOWN;
449
}
450
return 0;
451
}
452
453
plugin *plugin_list = NULL;
454
455
struct argp argp = { .options = options, .parser = parse_opt,
456
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
524
457
.doc = "Mandos plugin runner -- Run plugins" };
525
458
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);
459
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
529
460
if (ret == ARGP_ERR_UNKNOWN){
530
461
fprintf(stderr, "Unknown error while parsing arguments\n");
531
462
exitstatus = EXIT_FAILURE;
532
463
goto fallback;
533
464
}
534
535
/* Reset to the normal argument parser */
536
argp.parser = parse_opt;
537
538
/* Open the configfile if available */
465
539
466
if (argfile == NULL){
540
467
conffp = fopen(AFILE, "r");
541
468
} else {
542
469
conffp = fopen(argfile, "r");
543
}
470
}
471
544
472
if(conffp != NULL){
545
473
char *org_line = NULL;
546
474
char *p, *arg, *new_arg, *line;
558
486
}
559
487
custom_argv[0] = argv[0];
560
488
custom_argv[1] = NULL;
561
562
/* for each line in the config file, strip whitespace and ignore
563
commented text */
489
564
490
while(true){
565
491
sret = getline(&org_line, &size, conffp);
566
492
if(sret == -1){
595
521
}
596
522
}
597
523
free(org_line);
598
} else {
524
} else{
599
525
/* Check for harmful errors and go to fallback. Other errors might
600
526
not affect opening plugins */
601
527
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
604
530
goto fallback;
605
531
}
606
532
}
607
/* If there was any arguments from configuration file,
608
pass them to parser as command arguments */
533
609
534
if(custom_argv != NULL){
610
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
611
0, NULL);
535
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
612
536
if (ret == ARGP_ERR_UNKNOWN){
613
537
fprintf(stderr, "Unknown error while parsing arguments\n");
614
538
exitstatus = EXIT_FAILURE;
616
540
}
617
541
}
618
542
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
543
if(debug){
629
544
for(plugin *p = plugin_list; p != NULL; p=p->next){
630
545
fprintf(stderr, "Plugin: %s has %d arguments\n",
639
554
}
640
555
}
641
556
642
/* Strip permissions down to nobody */
643
557
ret = setuid(uid);
644
558
if (ret == -1){
645
559
perror("setuid");
646
}
560
}
561
647
562
setgid(gid);
648
563
if (ret == -1){
649
564
perror("setgid");
650
565
}
651
566
652
567
if (plugindir == NULL){
653
568
dir = opendir(PDIR);
654
569
} else {
676
591
677
592
FD_ZERO(&rfds_all);
678
593
679
/* Read and execute any executable in the plugin directory*/
680
594
while(true){
681
595
dirst = readdir(dir);
682
596
683
/* All directory entries have been processed */
597
// All directory entries have been processed
684
598
if(dirst == NULL){
685
599
if (errno == EBADF){
686
600
perror("readdir");
692
606
693
607
d_name_len = strlen(dirst->d_name);
694
608
695
/* Ignore dotfiles, backup files and other junk */
609
// Ignore dotfiles, backup files and other junk
696
610
{
697
611
bool bad_name = false;
698
612
713
627
break;
714
628
}
715
629
}
630
716
631
if(bad_name){
717
632
continue;
718
633
}
634
719
635
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
720
636
size_t suf_len = strlen(*suf);
721
637
if((d_name_len >= suf_len)
736
652
}
737
653
738
654
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
}
655
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
744
656
if(ret < 0){
745
657
perror("asprintf");
746
658
continue;
752
664
free(filename);
753
665
continue;
754
666
}
755
756
/* Ignore non-executable files */
667
757
668
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
758
669
if(debug){
759
670
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
762
673
free(filename);
763
674
continue;
764
675
}
765
766
plugin *p = getplugin(dirst->d_name);
676
plugin *p = getplugin(dirst->d_name, &plugin_list);
767
677
if(p == NULL){
768
678
perror("getplugin");
769
679
free(filename);
779
689
}
780
690
{
781
691
/* Add global arguments to argument list for this plugin */
782
plugin *g = getplugin(NULL);
692
plugin *g = getplugin(NULL, &plugin_list);
783
693
if(g != NULL){
784
694
for(char **a = g->argv + 1; *a != NULL; a++){
785
695
if(not add_argument(p, *a)){
788
698
}
789
699
/* Add global environment variables */
790
700
for(char **e = g->environ; *e != NULL; e++){
791
if(not add_environment(p, *e, false)){
701
if(not add_environment(p, *e)){
792
702
perror("add_environment");
793
703
}
794
704
}
799
709
process, too. */
800
710
if(p->environ[0] != NULL){
801
711
for(char **e = environ; *e != NULL; e++){
802
if(not add_environment(p, *e, false)){
712
char *copy = strdup(*e);
713
if(copy == NULL){
714
perror("strdup");
715
continue;
716
}
717
if(not add_environment(p, copy)){
803
718
perror("add_environment");
804
719
}
805
720
}
812
727
exitstatus = EXIT_FAILURE;
813
728
goto fallback;
814
729
}
815
/* Ask OS to automatic close the pipe on exec */
816
730
ret = set_cloexec_flag(pipefd[0]);
817
731
if(ret < 0){
818
732
perror("set_cloexec_flag");
832
746
exitstatus = EXIT_FAILURE;
833
747
goto fallback;
834
748
}
835
/* Starting a new process to be watched */
749
// Starting a new process to be watched
836
750
pid_t pid = fork();
837
751
if(pid == -1){
838
752
perror("fork");
846
760
perror("sigaction");
847
761
_exit(EXIT_FAILURE);
848
762
}
849
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
763
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
850
764
if(ret < 0){
851
765
perror("sigprocmask");
852
766
_exit(EXIT_FAILURE);
853
767
}
854
768
855
769
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
856
770
if(ret == -1){
857
771
perror("dup2");
876
790
}
877
791
/* no return */
878
792
}
879
/* Parent process */
880
close(pipefd[1]); /* Close unused write end of pipe */
793
/* parent process */
881
794
free(filename);
882
plugin *new_plugin = getplugin(dirst->d_name);
883
if (new_plugin == NULL){
884
perror("getplugin");
795
close(pipefd[1]); /* close unused write end of pipe */
796
process *new_process = malloc(sizeof(process));
797
if (new_process == NULL){
798
perror("malloc");
885
799
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
886
800
if(ret < 0){
887
perror("sigprocmask");
801
perror("sigprocmask");
888
802
}
889
803
exitstatus = EXIT_FAILURE;
890
804
goto fallback;
891
805
}
892
806
893
new_plugin->pid = pid;
894
new_plugin->fd = pipefd[0];
895
807
*new_process = (struct process){ .pid = pid,
808
.fd = pipefd[0],
809
.next = process_list };
810
// List handling
811
process_list = new_process;
896
812
/* Unblock SIGCHLD so signal handler can be run if this process
897
813
has already completed */
898
814
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
902
818
goto fallback;
903
819
}
904
820
905
FD_SET(new_plugin->fd, &rfds_all);
821
FD_SET(new_process->fd, &rfds_all);
906
822
907
if (maxfd < new_plugin->fd){
908
maxfd = new_plugin->fd;
823
if (maxfd < new_process->fd){
824
maxfd = new_process->fd;
909
825
}
826
910
827
}
828
829
free_plugin_list(plugin_list);
830
plugin_list = NULL;
911
831
912
832
closedir(dir);
913
833
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
}
834
835
if (process_list == NULL){
836
fprintf(stderr, "No plugin processes started. Incorrect plugin"
837
" directory?\n");
838
process_list = NULL;
924
839
}
925
926
/* Main loop while running plugins exist */
927
while(plugin_list){
840
while(process_list){
928
841
fd_set rfds = rfds_all;
929
842
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
930
843
if (select_ret == -1){
934
847
}
935
848
/* OK, now either a process completed, or something can be read
936
849
from one of them */
937
for(plugin *proc = plugin_list; proc != NULL;){
850
for(process *proc = process_list; proc ; proc = proc->next){
938
851
/* Is this process completely done? */
939
852
if(proc->eof and proc->completed){
940
853
/* Only accept the plugin output if it exited cleanly */
941
854
if(not WIFEXITED(proc->status)
942
855
or WEXITSTATUS(proc->status) != 0){
943
856
/* Bad exit by plugin */
944
945
857
if(debug){
946
858
if(WIFEXITED(proc->status)){
947
859
fprintf(stderr, "Plugin %u exited with status %d\n",
956
868
(unsigned int) (proc->pid));
957
869
}
958
870
}
959
960
871
/* Remove the plugin */
961
872
FD_CLR(proc->fd, &rfds_all);
962
963
873
/* Block signal while modifying process_list */
964
874
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
965
875
if(ret < 0){
967
877
exitstatus = EXIT_FAILURE;
968
878
goto fallback;
969
879
}
970
971
plugin *next_plugin = proc->next;
972
free_plugin(proc);
973
proc = next_plugin;
974
880
/* Delete this process entry from the list */
881
if(process_list == proc){
882
/* First one - simple */
883
process_list = proc->next;
884
} else {
885
/* Second one or later */
886
for(process *p = process_list; p != NULL; p = p->next){
887
if(p->next == proc){
888
p->next = proc->next;
889
break;
890
}
891
}
892
}
975
893
/* We are done modifying process list, so unblock signal */
976
894
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
977
895
NULL);
978
896
if(ret < 0){
979
897
perror("sigprocmask");
980
exitstatus = EXIT_FAILURE;
981
goto fallback;
982
}
983
984
if(plugin_list == NULL){
985
break;
986
}
987
988
continue;
898
}
899
free(proc->buffer);
900
free(proc);
901
/* We deleted this process from the list, so we can't go
902
proc->next. Therefore, start over from the beginning of
903
the process list */
904
break;
989
905
}
990
991
906
/* This process exited nicely, so print its buffer */
992
907
993
908
bool bret = print_out_password(proc->buffer,
994
909
proc->buffer_length);
995
910
if(not bret){
998
913
}
999
914
goto fallback;
1000
915
}
1001
1002
916
/* This process has not completed. Does it have any output? */
1003
917
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1004
918
/* This process had nothing to say at this time */
1005
proc = proc->next;
1006
919
continue;
1007
920
}
1008
921
/* Before reading, make the process' data buffer large enough */
1021
934
BUFFER_SIZE);
1022
935
if(ret < 0){
1023
936
/* Read error from this process; ignore the error */
1024
proc = proc->next;
1025
937
continue;
1026
938
}
1027
939
if(ret == 0){
1036
948
1037
949
fallback:
1038
950
1039
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
951
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1040
952
/* Fallback if all plugins failed, none are found or an error
1041
953
occured */
1042
954
bool bret;
1043
955
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1044
956
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);
957
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1052
958
if(not bret){
1053
959
perror("print_out_password");
1054
960
exitstatus = EXIT_FAILURE;
1061
967
perror("sigaction");
1062
968
exitstatus = EXIT_FAILURE;
1063
969
}
1064
970
1065
971
if(custom_argv != NULL){
1066
972
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1067
973
free(*arg);
1068
974
}
1069
975
free(custom_argv);
1070
976
}
977
free_plugin_list(plugin_list);
1071
978
1072
979
if(dir != NULL){
1073
980
closedir(dir);
1074
981
}
1075
982
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
}
983
/* Free the process list and kill the processes */
984
for(process *next; process_list != NULL; process_list = next){
985
next = process_list->next;
986
close(process_list->fd);
987
ret = kill(process_list->pid, SIGTERM);
988
if(ret == -1 and errno != ESRCH){
989
/* set-uid proccesses migth not get closed */
990
perror("kill");
1085
991
}
992
free(process_list->buffer);
993
free(process_list);
1086
994
}
1087
995
1088
996
/* Wait for any remaining child processes to terminate */
1092
1000
if(errno != ECHILD){
1093
1001
perror("wait");
1094
1002
}
1095
1096
free_plugin_list();
1097
1003
1098
1004
free(plugindir);
1099
1005
free(argfile);
1100
1006
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0