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- Committer: Teddy Hogeborn
- Date: 2008-08-30 11:31:37 UTC
- Revision ID: teddy@fukt.bsnet.se-20080830113137-v0inyj0limprzfwn
* mandos-options.xml (priority): Added <acronym> tags.
* mandos.xml (NAME): Improved wording.
* mandos.xml (NAME): Improved wording.
- 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
6
* Copyright © 2008 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,
70
69
#define PDIR "/lib/mandos/plugins.d"
71
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
72
71
73
const char *argp_program_version = "plugin-runner " VERSION;
72
const char *argp_program_version = "plugin-runner 1.0";
74
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
75
74
76
typedef struct plugin{
77
char *name; /* can be NULL or any plugin name */
78
char **argv;
79
int argc;
80
char **environ;
81
int envc;
82
bool disabled;
75
struct process;
83
76
84
/* Variables used for running processes*/
77
typedef struct process{
85
78
pid_t pid;
86
79
int fd;
87
80
char *buffer;
90
83
bool eof;
91
84
volatile bool completed;
92
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;
93
96
struct plugin *next;
94
97
} plugin;
95
98
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){
99
static plugin *getplugin(char *name, plugin **plugin_list){
100
for (plugin *p = *plugin_list; p != NULL; p = p->next){
103
101
if ((p->name == name)
104
102
or (p->name and name and (strcmp(p->name, name) == 0))){
105
103
return p;
120
118
121
119
*new_plugin = (plugin) { .name = copy_name,
122
120
.argc = 1,
121
.envc = 0,
123
122
.disabled = false,
124
.next = plugin_list };
123
.next = *plugin_list };
125
124
126
125
new_plugin->argv = malloc(sizeof(char *) * 2);
127
126
if (new_plugin->argv == NULL){
131
130
}
132
131
new_plugin->argv[0] = copy_name;
133
132
new_plugin->argv[1] = NULL;
134
133
135
134
new_plugin->environ = malloc(sizeof(char *));
136
135
if(new_plugin->environ == NULL){
137
136
free(copy_name);
140
139
return NULL;
141
140
}
142
141
new_plugin->environ[0] = NULL;
143
144
142
/* Append the new plugin to the list */
145
plugin_list = new_plugin;
143
*plugin_list = new_plugin;
146
144
return new_plugin;
147
145
}
148
146
178
176
}
179
177
180
178
/* Add to a plugin's environment */
181
static bool add_environment(plugin *p, const char *def, bool replace){
179
static bool add_environment(plugin *p, const char *def){
182
180
if(p == NULL){
183
181
return false;
184
182
}
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
183
return add_to_char_array(def, &(p->environ), &(p->envc));
203
184
}
204
185
186
205
187
/*
206
188
* Based on the example in the GNU LibC manual chapter 13.13 "File
207
189
* Descriptor Flags".
208
190
* *Note File Descriptor Flags:(libc)Descriptor Flags.
209
191
*/
210
static int set_cloexec_flag(int fd){
192
static int set_cloexec_flag(int fd)
193
{
211
194
int ret = fcntl(fd, F_GETFD, 0);
212
195
/* If reading the flags failed, return error indication now. */
213
196
if(ret < 0){
217
200
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
218
201
}
219
202
203
process *process_list = NULL;
220
204
221
205
/* Mark processes as completed when they exit, and save their exit
222
206
status. */
223
static void handle_sigchld(__attribute__((unused)) int sig){
207
void handle_sigchld(__attribute__((unused)) int sig){
224
208
while(true){
225
plugin *proc = plugin_list;
209
process *proc = process_list;
226
210
int status;
227
211
pid_t pid = waitpid(-1, &status, WNOHANG);
228
212
if(pid == 0){
236
220
/* No child processes */
237
221
break;
238
222
}
239
223
240
224
/* A child exited, find it in process_list */
241
225
while(proc != NULL and proc->pid != pid){
242
226
proc = proc->next;
250
234
}
251
235
}
252
236
253
/* Prints out a password to stdout */
254
static bool print_out_password(const char *buffer, size_t length){
237
bool print_out_password(const char *buffer, size_t length){
255
238
ssize_t ret;
239
if(length>0 and buffer[length-1] == '\n'){
240
length--;
241
}
256
242
for(size_t written = 0; written < length; written += (size_t)ret){
257
243
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
258
244
length - written));
263
249
return true;
264
250
}
265
251
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
}
290
}
291
}
292
293
free(plugin_node);
294
}
295
296
static void free_plugin_list(void){
297
while(plugin_list != NULL){
298
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);
299
264
}
300
265
}
301
266
339
304
{ .name = "global-options", .key = 'g',
340
305
.arg = "OPTION[,OPTION[,...]]",
341
306
.doc = "Options passed to all plugins" },
342
{ .name = "global-env", .key = 'G',
307
{ .name = "global-envs", .key = 'e',
343
308
.arg = "VAR=value",
344
309
.doc = "Environment variable passed to all plugins" },
345
310
{ .name = "options-for", .key = 'o',
346
311
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
347
312
.doc = "Options passed only to specified plugin" },
348
{ .name = "env-for", .key = 'E',
313
{ .name = "envs-for", .key = 'f',
349
314
.arg = "PLUGIN:ENV=value",
350
315
.doc = "Environment variable passed to specified plugin" },
351
316
{ .name = "disable", .key = 'd',
352
317
.arg = "PLUGIN",
353
318
.doc = "Disable a specific plugin", .group = 1 },
354
{ .name = "enable", .key = 'e',
355
.arg = "PLUGIN",
356
.doc = "Enable a specific plugin", .group = 1 },
357
319
{ .name = "plugin-dir", .key = 128,
358
320
.arg = "DIRECTORY",
359
321
.doc = "Specify a different plugin directory", .group = 2 },
371
333
{ .name = NULL }
372
334
};
373
335
374
error_t parse_opt (int key, char *arg, __attribute__((unused))
375
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;
376
340
switch (key) {
377
case 'g': /* --global-options */
341
case 'g':
378
342
if (arg != NULL){
379
343
char *p;
380
344
while((p = strsep(&arg, ",")) != NULL){
381
345
if(p[0] == '\0'){
382
346
continue;
383
347
}
384
if(not add_argument(getplugin(NULL), p)){
348
if(not add_argument(getplugin(NULL, plugins), p)){
385
349
perror("add_argument");
386
350
return ARGP_ERR_UNKNOWN;
387
351
}
388
352
}
389
353
}
390
354
break;
391
case 'G': /* --global-env */
355
case 'e':
392
356
if(arg == NULL){
393
357
break;
394
358
}
395
if(not add_environment(getplugin(NULL), arg, true)){
396
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
}
397
367
}
398
368
break;
399
case 'o': /* --options-for */
369
case 'o':
400
370
if (arg != NULL){
401
371
char *p_name = strsep(&arg, ":");
402
if(p_name[0] == '\0' or arg == NULL){
372
if(p_name[0] == '\0'){
403
373
break;
404
374
}
405
375
char *opt = strsep(&arg, ":");
406
if(opt[0] == '\0' or opt == NULL){
376
if(opt[0] == '\0'){
407
377
break;
408
378
}
409
char *p;
410
while((p = strsep(&opt, ",")) != NULL){
411
if(p[0] == '\0'){
412
continue;
413
}
414
if(not add_argument(getplugin(p_name), p)){
415
perror("add_argument");
416
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
}
417
389
}
418
390
}
419
391
}
420
392
break;
421
case 'E': /* --env-for */
393
case 'f':
422
394
if(arg == NULL){
423
395
break;
424
396
}
427
399
if(envdef == NULL){
428
400
break;
429
401
}
430
*envdef = '\0';
431
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)){
432
408
perror("add_environment");
433
409
}
434
410
}
435
411
break;
436
case 'd': /* --disable */
412
case 'd':
437
413
if (arg != NULL){
438
plugin *p = getplugin(arg);
414
plugin *p = getplugin(arg, plugins);
439
415
if(p == NULL){
440
416
return ARGP_ERR_UNKNOWN;
441
417
}
442
418
p->disabled = true;
443
419
}
444
420
break;
445
case 'e': /* --enable */
446
if (arg != NULL){
447
plugin *p = getplugin(arg);
448
if(p == NULL){
449
return ARGP_ERR_UNKNOWN;
450
}
451
p->disabled = false;
452
}
453
break;
454
case 128: /* --plugin-dir */
455
free(plugindir);
421
case 128:
456
422
plugindir = strdup(arg);
457
423
if(plugindir == NULL){
458
424
perror("strdup");
459
425
}
460
426
break;
461
case 129: /* --config-file */
462
/* This is already done by parse_opt_config_file() */
463
break;
464
case 130: /* --userid */
427
case 129:
428
argfile = strdup(arg);
429
if(argfile == NULL){
430
perror("strdup");
431
}
432
break;
433
case 130:
465
434
uid = (uid_t)strtol(arg, NULL, 10);
466
435
break;
467
case 131: /* --groupid */
436
case 131:
468
437
gid = (gid_t)strtol(arg, NULL, 10);
469
438
break;
470
case 132: /* --debug */
439
case 132:
471
440
debug = true;
472
441
break;
473
442
case ARGP_KEY_ARG:
474
/* Cryptsetup always passes an argument, which is an empty
475
string if "none" was specified in /etc/crypttab. So if
476
argument was empty, we ignore it silently. */
477
if(arg[0] != '\0'){
478
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
479
}
480
break;
481
case ARGP_KEY_END:
482
break;
483
default:
484
return ARGP_ERR_UNKNOWN;
485
}
486
return 0;
487
}
488
489
/* This option parser is the same as parse_opt() above, except it
490
ignores everything but the --config-file option. */
491
error_t parse_opt_config_file (int key, char *arg,
492
__attribute__((unused))
493
struct argp_state *state) {
494
switch (key) {
495
case 'g': /* --global-options */
496
case 'G': /* --global-env */
497
case 'o': /* --options-for */
498
case 'E': /* --env-for */
499
case 'd': /* --disable */
500
case 'e': /* --enable */
501
case 128: /* --plugin-dir */
502
break;
503
case 129: /* --config-file */
504
free(argfile);
505
argfile = strdup(arg);
506
if(argfile == NULL){
507
perror("strdup");
508
}
509
break;
510
case 130: /* --userid */
511
case 131: /* --groupid */
512
case 132: /* --debug */
513
case ARGP_KEY_ARG:
514
case ARGP_KEY_END:
515
break;
516
default:
517
return ARGP_ERR_UNKNOWN;
518
}
519
return 0;
520
}
521
522
struct argp argp = { .options = options,
523
.parser = parse_opt_config_file,
524
.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]",
525
457
.doc = "Mandos plugin runner -- Run plugins" };
526
458
527
/* Parse using the parse_opt_config_file in order to get the custom
528
config file location, if any. */
529
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
459
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
530
460
if (ret == ARGP_ERR_UNKNOWN){
531
461
fprintf(stderr, "Unknown error while parsing arguments\n");
532
462
exitstatus = EXIT_FAILURE;
533
463
goto fallback;
534
464
}
535
536
/* Reset to the normal argument parser */
537
argp.parser = parse_opt;
538
539
/* Open the configfile if available */
465
540
466
if (argfile == NULL){
541
467
conffp = fopen(AFILE, "r");
542
468
} else {
543
469
conffp = fopen(argfile, "r");
544
}
470
}
471
545
472
if(conffp != NULL){
546
473
char *org_line = NULL;
547
474
char *p, *arg, *new_arg, *line;
559
486
}
560
487
custom_argv[0] = argv[0];
561
488
custom_argv[1] = NULL;
562
563
/* for each line in the config file, strip whitespace and ignore
564
commented text */
489
565
490
while(true){
566
491
sret = getline(&org_line, &size, conffp);
567
492
if(sret == -1){
596
521
}
597
522
}
598
523
free(org_line);
599
} else {
524
} else{
600
525
/* Check for harmful errors and go to fallback. Other errors might
601
526
not affect opening plugins */
602
527
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
605
530
goto fallback;
606
531
}
607
532
}
608
/* If there was any arguments from configuration file,
609
pass them to parser as command arguments */
533
610
534
if(custom_argv != NULL){
611
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
612
0, NULL);
535
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
613
536
if (ret == ARGP_ERR_UNKNOWN){
614
537
fprintf(stderr, "Unknown error while parsing arguments\n");
615
538
exitstatus = EXIT_FAILURE;
617
540
}
618
541
}
619
542
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
543
if(debug){
630
544
for(plugin *p = plugin_list; p != NULL; p=p->next){
631
545
fprintf(stderr, "Plugin: %s has %d arguments\n",
640
554
}
641
555
}
642
556
643
/* Strip permissions down to nobody */
644
557
ret = setuid(uid);
645
558
if (ret == -1){
646
559
perror("setuid");
647
}
560
}
561
648
562
setgid(gid);
649
563
if (ret == -1){
650
564
perror("setgid");
651
565
}
652
566
653
567
if (plugindir == NULL){
654
568
dir = opendir(PDIR);
655
569
} else {
677
591
678
592
FD_ZERO(&rfds_all);
679
593
680
/* Read and execute any executable in the plugin directory*/
681
594
while(true){
682
595
dirst = readdir(dir);
683
596
684
/* All directory entries have been processed */
597
// All directory entries have been processed
685
598
if(dirst == NULL){
686
599
if (errno == EBADF){
687
600
perror("readdir");
693
606
694
607
d_name_len = strlen(dirst->d_name);
695
608
696
/* Ignore dotfiles, backup files and other junk */
609
// Ignore dotfiles, backup files and other junk
697
610
{
698
611
bool bad_name = false;
699
612
701
614
702
615
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
703
616
".dpkg-old",
704
".dpkg-bak",
705
617
".dpkg-divert", NULL };
706
618
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
707
619
size_t pre_len = strlen(*pre);
715
627
break;
716
628
}
717
629
}
630
718
631
if(bad_name){
719
632
continue;
720
633
}
634
721
635
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
722
636
size_t suf_len = strlen(*suf);
723
637
if((d_name_len >= suf_len)
738
652
}
739
653
740
654
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
}
655
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
746
656
if(ret < 0){
747
657
perror("asprintf");
748
658
continue;
754
664
free(filename);
755
665
continue;
756
666
}
757
758
/* Ignore non-executable files */
667
759
668
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
760
669
if(debug){
761
670
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
764
673
free(filename);
765
674
continue;
766
675
}
767
768
plugin *p = getplugin(dirst->d_name);
676
plugin *p = getplugin(dirst->d_name, &plugin_list);
769
677
if(p == NULL){
770
678
perror("getplugin");
771
679
free(filename);
781
689
}
782
690
{
783
691
/* Add global arguments to argument list for this plugin */
784
plugin *g = getplugin(NULL);
692
plugin *g = getplugin(NULL, &plugin_list);
785
693
if(g != NULL){
786
694
for(char **a = g->argv + 1; *a != NULL; a++){
787
695
if(not add_argument(p, *a)){
790
698
}
791
699
/* Add global environment variables */
792
700
for(char **e = g->environ; *e != NULL; e++){
793
if(not add_environment(p, *e, false)){
701
if(not add_environment(p, *e)){
794
702
perror("add_environment");
795
703
}
796
704
}
801
709
process, too. */
802
710
if(p->environ[0] != NULL){
803
711
for(char **e = environ; *e != NULL; e++){
804
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)){
805
718
perror("add_environment");
806
719
}
807
720
}
814
727
exitstatus = EXIT_FAILURE;
815
728
goto fallback;
816
729
}
817
/* Ask OS to automatic close the pipe on exec */
818
730
ret = set_cloexec_flag(pipefd[0]);
819
731
if(ret < 0){
820
732
perror("set_cloexec_flag");
834
746
exitstatus = EXIT_FAILURE;
835
747
goto fallback;
836
748
}
837
/* Starting a new process to be watched */
749
// Starting a new process to be watched
838
750
pid_t pid = fork();
839
751
if(pid == -1){
840
752
perror("fork");
848
760
perror("sigaction");
849
761
_exit(EXIT_FAILURE);
850
762
}
851
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
763
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
852
764
if(ret < 0){
853
765
perror("sigprocmask");
854
766
_exit(EXIT_FAILURE);
855
767
}
856
768
857
769
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
858
770
if(ret == -1){
859
771
perror("dup2");
878
790
}
879
791
/* no return */
880
792
}
881
/* Parent process */
882
close(pipefd[1]); /* Close unused write end of pipe */
793
/* parent process */
883
794
free(filename);
884
plugin *new_plugin = getplugin(dirst->d_name);
885
if (new_plugin == NULL){
886
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");
887
799
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
888
800
if(ret < 0){
889
perror("sigprocmask");
801
perror("sigprocmask");
890
802
}
891
803
exitstatus = EXIT_FAILURE;
892
804
goto fallback;
893
805
}
894
806
895
new_plugin->pid = pid;
896
new_plugin->fd = pipefd[0];
897
807
*new_process = (struct process){ .pid = pid,
808
.fd = pipefd[0],
809
.next = process_list };
810
// List handling
811
process_list = new_process;
898
812
/* Unblock SIGCHLD so signal handler can be run if this process
899
813
has already completed */
900
814
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
904
818
goto fallback;
905
819
}
906
820
907
FD_SET(new_plugin->fd, &rfds_all);
821
FD_SET(new_process->fd, &rfds_all);
908
822
909
if (maxfd < new_plugin->fd){
910
maxfd = new_plugin->fd;
823
if (maxfd < new_process->fd){
824
maxfd = new_process->fd;
911
825
}
826
912
827
}
828
829
free_plugin_list(plugin_list);
830
plugin_list = NULL;
913
831
914
832
closedir(dir);
915
833
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
}
834
835
if (process_list == NULL){
836
fprintf(stderr, "No plugin processes started. Incorrect plugin"
837
" directory?\n");
838
process_list = NULL;
926
839
}
927
928
/* Main loop while running plugins exist */
929
while(plugin_list){
840
while(process_list){
930
841
fd_set rfds = rfds_all;
931
842
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
932
843
if (select_ret == -1){
936
847
}
937
848
/* OK, now either a process completed, or something can be read
938
849
from one of them */
939
for(plugin *proc = plugin_list; proc != NULL;){
850
for(process *proc = process_list; proc ; proc = proc->next){
940
851
/* Is this process completely done? */
941
852
if(proc->eof and proc->completed){
942
853
/* Only accept the plugin output if it exited cleanly */
943
854
if(not WIFEXITED(proc->status)
944
855
or WEXITSTATUS(proc->status) != 0){
945
856
/* Bad exit by plugin */
946
947
857
if(debug){
948
858
if(WIFEXITED(proc->status)){
949
859
fprintf(stderr, "Plugin %u exited with status %d\n",
958
868
(unsigned int) (proc->pid));
959
869
}
960
870
}
961
962
871
/* Remove the plugin */
963
872
FD_CLR(proc->fd, &rfds_all);
964
965
873
/* Block signal while modifying process_list */
966
874
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
967
875
if(ret < 0){
969
877
exitstatus = EXIT_FAILURE;
970
878
goto fallback;
971
879
}
972
973
plugin *next_plugin = proc->next;
974
free_plugin(proc);
975
proc = next_plugin;
976
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
}
977
893
/* We are done modifying process list, so unblock signal */
978
894
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
979
895
NULL);
980
896
if(ret < 0){
981
897
perror("sigprocmask");
982
exitstatus = EXIT_FAILURE;
983
goto fallback;
984
}
985
986
if(plugin_list == NULL){
987
break;
988
}
989
990
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;
991
905
}
992
993
906
/* This process exited nicely, so print its buffer */
994
907
995
908
bool bret = print_out_password(proc->buffer,
996
909
proc->buffer_length);
997
910
if(not bret){
1000
913
}
1001
914
goto fallback;
1002
915
}
1003
1004
916
/* This process has not completed. Does it have any output? */
1005
917
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1006
918
/* This process had nothing to say at this time */
1007
proc = proc->next;
1008
919
continue;
1009
920
}
1010
921
/* Before reading, make the process' data buffer large enough */
1023
934
BUFFER_SIZE);
1024
935
if(ret < 0){
1025
936
/* Read error from this process; ignore the error */
1026
proc = proc->next;
1027
937
continue;
1028
938
}
1029
939
if(ret == 0){
1038
948
1039
949
fallback:
1040
950
1041
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
951
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1042
952
/* Fallback if all plugins failed, none are found or an error
1043
953
occured */
1044
954
bool bret;
1045
955
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1046
956
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);
957
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1054
958
if(not bret){
1055
959
perror("print_out_password");
1056
960
exitstatus = EXIT_FAILURE;
1063
967
perror("sigaction");
1064
968
exitstatus = EXIT_FAILURE;
1065
969
}
1066
970
1067
971
if(custom_argv != NULL){
1068
972
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1069
973
free(*arg);
1070
974
}
1071
975
free(custom_argv);
1072
976
}
977
free_plugin_list(plugin_list);
1073
978
1074
979
if(dir != NULL){
1075
980
closedir(dir);
1076
981
}
1077
982
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
}
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");
1087
991
}
992
free(process_list->buffer);
993
free(process_list);
1088
994
}
1089
995
1090
996
/* Wait for any remaining child processes to terminate */
1094
1000
if(errno != ECHILD){
1095
1001
perror("wait");
1096
1002
}
1097
1098
free_plugin_list();
1099
1003
1100
1004
free(plugindir);
1101
1005
free(argfile);
1102
1006
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0