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- Committer: Björn Påhlsson
- Date: 2008-12-21 16:34:22 UTC
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 238.
- Revision ID: belorn@braxen-20081221163422-nzolm1l1yed6ta9g
added a mandos list client program
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- plugins.d/usplash
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2008 Teddy Hogeborn
6
* Copyright © 2008 Björn Påhlsson
6
7
*
7
8
* This program is free software: you can redistribute it and/or
8
9
* modify it under the terms of the GNU General Public License as
27
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
29
EXIT_SUCCESS, realloc() */
29
30
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
32
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
34
stat, waitpid(), WIFEXITED(),
34
35
WEXITSTATUS(), wait(), pid_t,
46
47
fcntl(), setuid(), setgid(),
47
48
F_GETFD, F_SETFD, FD_CLOEXEC,
48
49
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
dup2(), STDOUT_FILENO, _exit(),
50
51
execv(), write(), read(),
51
52
close() */
52
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
69
70
#define PDIR "/lib/mandos/plugins.d"
70
71
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
72
72
const char *argp_program_version = "plugin-runner 1.0";
73
const char *argp_program_version = "plugin-runner " VERSION;
73
74
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
75
75
struct process;
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;
76
83
77
typedef struct process{
84
/* Variables used for running processes*/
78
85
pid_t pid;
79
86
int fd;
80
87
char *buffer;
83
90
bool eof;
84
91
volatile bool completed;
85
92
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;
96
93
struct plugin *next;
97
94
} plugin;
98
95
99
static plugin *getplugin(char *name, plugin **plugin_list){
100
for (plugin *p = *plugin_list; p != NULL; p = p->next){
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){
101
103
if ((p->name == name)
102
104
or (p->name and name and (strcmp(p->name, name) == 0))){
103
105
return p;
118
120
119
121
*new_plugin = (plugin) { .name = copy_name,
120
122
.argc = 1,
121
.envc = 0,
122
123
.disabled = false,
123
.next = *plugin_list };
124
.next = plugin_list };
124
125
125
126
new_plugin->argv = malloc(sizeof(char *) * 2);
126
127
if (new_plugin->argv == NULL){
130
131
}
131
132
new_plugin->argv[0] = copy_name;
132
133
new_plugin->argv[1] = NULL;
133
134
134
135
new_plugin->environ = malloc(sizeof(char *));
135
136
if(new_plugin->environ == NULL){
136
137
free(copy_name);
139
140
return NULL;
140
141
}
141
142
new_plugin->environ[0] = NULL;
143
142
144
/* Append the new plugin to the list */
143
*plugin_list = new_plugin;
145
plugin_list = new_plugin;
144
146
return new_plugin;
145
147
}
146
148
176
178
}
177
179
178
180
/* Add to a plugin's environment */
179
static bool add_environment(plugin *p, const char *def){
181
static bool add_environment(plugin *p, const char *def, bool replace){
180
182
if(p == NULL){
181
183
return false;
182
184
}
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
}
183
202
return add_to_char_array(def, &(p->environ), &(p->envc));
184
203
}
185
204
186
187
205
/*
188
206
* Based on the example in the GNU LibC manual chapter 13.13 "File
189
207
* Descriptor Flags".
190
208
* *Note File Descriptor Flags:(libc)Descriptor Flags.
191
209
*/
192
static int set_cloexec_flag(int fd)
193
{
210
static int set_cloexec_flag(int fd){
194
211
int ret = fcntl(fd, F_GETFD, 0);
195
212
/* If reading the flags failed, return error indication now. */
196
213
if(ret < 0){
200
217
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
201
218
}
202
219
203
process *process_list = NULL;
204
220
205
221
/* Mark processes as completed when they exit, and save their exit
206
222
status. */
207
void handle_sigchld(__attribute__((unused)) int sig){
223
static void handle_sigchld(__attribute__((unused)) int sig){
208
224
while(true){
209
process *proc = process_list;
225
plugin *proc = plugin_list;
210
226
int status;
211
227
pid_t pid = waitpid(-1, &status, WNOHANG);
212
228
if(pid == 0){
220
236
/* No child processes */
221
237
break;
222
238
}
223
239
224
240
/* A child exited, find it in process_list */
225
241
while(proc != NULL and proc->pid != pid){
226
242
proc = proc->next;
234
250
}
235
251
}
236
252
237
bool print_out_password(const char *buffer, size_t length){
253
/* Prints out a password to stdout */
254
static bool print_out_password(const char *buffer, size_t length){
238
255
ssize_t ret;
239
if(length>0 and buffer[length-1] == '\n'){
240
length--;
241
}
242
256
for(size_t written = 0; written < length; written += (size_t)ret){
243
257
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
244
258
length - written));
249
263
return true;
250
264
}
251
265
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);
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);
264
299
}
265
300
}
266
301
304
339
{ .name = "global-options", .key = 'g',
305
340
.arg = "OPTION[,OPTION[,...]]",
306
341
.doc = "Options passed to all plugins" },
307
{ .name = "global-envs", .key = 'e',
342
{ .name = "global-env", .key = 'G',
308
343
.arg = "VAR=value",
309
344
.doc = "Environment variable passed to all plugins" },
310
345
{ .name = "options-for", .key = 'o',
311
346
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
312
347
.doc = "Options passed only to specified plugin" },
313
{ .name = "envs-for", .key = 'f',
348
{ .name = "env-for", .key = 'E',
314
349
.arg = "PLUGIN:ENV=value",
315
350
.doc = "Environment variable passed to specified plugin" },
316
351
{ .name = "disable", .key = 'd',
317
352
.arg = "PLUGIN",
318
353
.doc = "Disable a specific plugin", .group = 1 },
354
{ .name = "enable", .key = 'e',
355
.arg = "PLUGIN",
356
.doc = "Enable a specific plugin", .group = 1 },
319
357
{ .name = "plugin-dir", .key = 128,
320
358
.arg = "DIRECTORY",
321
359
.doc = "Specify a different plugin directory", .group = 2 },
333
371
{ .name = NULL }
334
372
};
335
373
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;
374
error_t parse_opt (int key, char *arg, __attribute__((unused))
375
struct argp_state *state) {
340
376
switch (key) {
341
case 'g':
377
case 'g': /* --global-options */
342
378
if (arg != NULL){
343
379
char *p;
344
380
while((p = strsep(&arg, ",")) != NULL){
345
381
if(p[0] == '\0'){
346
382
continue;
347
383
}
348
if(not add_argument(getplugin(NULL, plugins), p)){
384
if(not add_argument(getplugin(NULL), p)){
349
385
perror("add_argument");
350
386
return ARGP_ERR_UNKNOWN;
351
387
}
352
388
}
353
389
}
354
390
break;
355
case 'e':
391
case 'G': /* --global-env */
356
392
if(arg == NULL){
357
393
break;
358
394
}
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
}
395
if(not add_environment(getplugin(NULL), arg, true)){
396
perror("add_environment");
367
397
}
368
398
break;
369
case 'o':
399
case 'o': /* --options-for */
370
400
if (arg != NULL){
371
401
char *p_name = strsep(&arg, ":");
372
if(p_name[0] == '\0'){
402
if(p_name[0] == '\0' or arg == NULL){
373
403
break;
374
404
}
375
405
char *opt = strsep(&arg, ":");
376
if(opt[0] == '\0'){
406
if(opt[0] == '\0' or opt == NULL){
377
407
break;
378
408
}
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
}
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;
389
417
}
390
418
}
391
419
}
392
420
break;
393
case 'f':
421
case 'E': /* --env-for */
394
422
if(arg == NULL){
395
423
break;
396
424
}
399
427
if(envdef == NULL){
400
428
break;
401
429
}
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)){
430
*envdef = '\0';
431
if(not add_environment(getplugin(arg), envdef+1, true)){
408
432
perror("add_environment");
409
433
}
410
434
}
411
435
break;
412
case 'd':
436
case 'd': /* --disable */
413
437
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
438
plugin *p = getplugin(arg);
415
439
if(p == NULL){
416
440
return ARGP_ERR_UNKNOWN;
417
441
}
418
442
p->disabled = true;
419
443
}
420
444
break;
421
case 128:
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);
422
456
plugindir = strdup(arg);
423
457
if(plugindir == NULL){
424
458
perror("strdup");
425
459
}
426
460
break;
427
case 129:
461
case 129: /* --config-file */
462
/* This is already done by parse_opt_config_file() */
463
break;
464
case 130: /* --userid */
465
uid = (uid_t)strtol(arg, NULL, 10);
466
break;
467
case 131: /* --groupid */
468
gid = (gid_t)strtol(arg, NULL, 10);
469
break;
470
case 132: /* --debug */
471
debug = true;
472
break;
473
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);
428
505
argfile = strdup(arg);
429
506
if(argfile == NULL){
430
507
perror("strdup");
431
508
}
432
509
break;
433
case 130:
434
uid = (uid_t)strtol(arg, NULL, 10);
435
break;
436
case 131:
437
gid = (gid_t)strtol(arg, NULL, 10);
438
break;
439
case 132:
440
debug = true;
441
break;
510
case 130: /* --userid */
511
case 131: /* --groupid */
512
case 132: /* --debug */
442
513
case ARGP_KEY_ARG:
443
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
444
break;
445
514
case ARGP_KEY_END:
446
515
break;
447
516
default:
450
519
return 0;
451
520
}
452
521
453
plugin *plugin_list = NULL;
454
455
struct argp argp = { .options = options, .parser = parse_opt,
456
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
522
struct argp argp = { .options = options,
523
.parser = parse_opt_config_file,
524
.args_doc = "",
457
525
.doc = "Mandos plugin runner -- Run plugins" };
458
526
459
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
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);
460
530
if (ret == ARGP_ERR_UNKNOWN){
461
531
fprintf(stderr, "Unknown error while parsing arguments\n");
462
532
exitstatus = EXIT_FAILURE;
463
533
goto fallback;
464
534
}
465
535
536
/* Reset to the normal argument parser */
537
argp.parser = parse_opt;
538
539
/* Open the configfile if available */
466
540
if (argfile == NULL){
467
541
conffp = fopen(AFILE, "r");
468
542
} else {
469
543
conffp = fopen(argfile, "r");
470
}
471
544
}
472
545
if(conffp != NULL){
473
546
char *org_line = NULL;
474
547
char *p, *arg, *new_arg, *line;
486
559
}
487
560
custom_argv[0] = argv[0];
488
561
custom_argv[1] = NULL;
489
562
563
/* for each line in the config file, strip whitespace and ignore
564
commented text */
490
565
while(true){
491
566
sret = getline(&org_line, &size, conffp);
492
567
if(sret == -1){
521
596
}
522
597
}
523
598
free(org_line);
524
} else{
599
} else {
525
600
/* Check for harmful errors and go to fallback. Other errors might
526
601
not affect opening plugins */
527
602
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
530
605
goto fallback;
531
606
}
532
607
}
533
608
/* If there was any arguments from configuration file,
609
pass them to parser as command arguments */
534
610
if(custom_argv != NULL){
535
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
611
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
612
0, NULL);
536
613
if (ret == ARGP_ERR_UNKNOWN){
537
614
fprintf(stderr, "Unknown error while parsing arguments\n");
538
615
exitstatus = EXIT_FAILURE;
540
617
}
541
618
}
542
619
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
543
629
if(debug){
544
630
for(plugin *p = plugin_list; p != NULL; p=p->next){
545
631
fprintf(stderr, "Plugin: %s has %d arguments\n",
554
640
}
555
641
}
556
642
643
/* Strip permissions down to nobody */
557
644
ret = setuid(uid);
558
645
if (ret == -1){
559
646
perror("setuid");
560
}
561
647
}
562
648
setgid(gid);
563
649
if (ret == -1){
564
650
perror("setgid");
565
651
}
566
652
567
653
if (plugindir == NULL){
568
654
dir = opendir(PDIR);
569
655
} else {
591
677
592
678
FD_ZERO(&rfds_all);
593
679
680
/* Read and execute any executable in the plugin directory*/
594
681
while(true){
595
682
dirst = readdir(dir);
596
683
597
// All directory entries have been processed
684
/* All directory entries have been processed */
598
685
if(dirst == NULL){
599
686
if (errno == EBADF){
600
687
perror("readdir");
606
693
607
694
d_name_len = strlen(dirst->d_name);
608
695
609
// Ignore dotfiles, backup files and other junk
696
/* Ignore dotfiles, backup files and other junk */
610
697
{
611
698
bool bad_name = false;
612
699
614
701
615
702
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
616
703
".dpkg-old",
704
".dpkg-bak",
617
705
".dpkg-divert", NULL };
618
706
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
619
707
size_t pre_len = strlen(*pre);
627
715
break;
628
716
}
629
717
}
630
631
718
if(bad_name){
632
719
continue;
633
720
}
634
635
721
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
636
722
size_t suf_len = strlen(*suf);
637
723
if((d_name_len >= suf_len)
652
738
}
653
739
654
740
char *filename;
655
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
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
}
656
746
if(ret < 0){
657
747
perror("asprintf");
658
748
continue;
664
754
free(filename);
665
755
continue;
666
756
}
667
757
758
/* Ignore non-executable files */
668
759
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
669
760
if(debug){
670
761
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
673
764
free(filename);
674
765
continue;
675
766
}
676
plugin *p = getplugin(dirst->d_name, &plugin_list);
767
768
plugin *p = getplugin(dirst->d_name);
677
769
if(p == NULL){
678
770
perror("getplugin");
679
771
free(filename);
689
781
}
690
782
{
691
783
/* Add global arguments to argument list for this plugin */
692
plugin *g = getplugin(NULL, &plugin_list);
784
plugin *g = getplugin(NULL);
693
785
if(g != NULL){
694
786
for(char **a = g->argv + 1; *a != NULL; a++){
695
787
if(not add_argument(p, *a)){
698
790
}
699
791
/* Add global environment variables */
700
792
for(char **e = g->environ; *e != NULL; e++){
701
if(not add_environment(p, *e)){
793
if(not add_environment(p, *e, false)){
702
794
perror("add_environment");
703
795
}
704
796
}
709
801
process, too. */
710
802
if(p->environ[0] != NULL){
711
803
for(char **e = environ; *e != NULL; e++){
712
char *copy = strdup(*e);
713
if(copy == NULL){
714
perror("strdup");
715
continue;
716
}
717
if(not add_environment(p, copy)){
804
if(not add_environment(p, *e, false)){
718
805
perror("add_environment");
719
806
}
720
807
}
727
814
exitstatus = EXIT_FAILURE;
728
815
goto fallback;
729
816
}
817
/* Ask OS to automatic close the pipe on exec */
730
818
ret = set_cloexec_flag(pipefd[0]);
731
819
if(ret < 0){
732
820
perror("set_cloexec_flag");
746
834
exitstatus = EXIT_FAILURE;
747
835
goto fallback;
748
836
}
749
// Starting a new process to be watched
837
/* Starting a new process to be watched */
750
838
pid_t pid = fork();
751
839
if(pid == -1){
752
840
perror("fork");
760
848
perror("sigaction");
761
849
_exit(EXIT_FAILURE);
762
850
}
763
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
851
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
764
852
if(ret < 0){
765
853
perror("sigprocmask");
766
854
_exit(EXIT_FAILURE);
767
855
}
768
856
769
857
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
770
858
if(ret == -1){
771
859
perror("dup2");
790
878
}
791
879
/* no return */
792
880
}
793
/* parent process */
881
/* Parent process */
882
close(pipefd[1]); /* Close unused write end of pipe */
794
883
free(filename);
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");
884
plugin *new_plugin = getplugin(dirst->d_name);
885
if (new_plugin == NULL){
886
perror("getplugin");
799
887
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
800
888
if(ret < 0){
801
perror("sigprocmask");
889
perror("sigprocmask");
802
890
}
803
891
exitstatus = EXIT_FAILURE;
804
892
goto fallback;
805
893
}
806
894
807
*new_process = (struct process){ .pid = pid,
808
.fd = pipefd[0],
809
.next = process_list };
810
// List handling
811
process_list = new_process;
895
new_plugin->pid = pid;
896
new_plugin->fd = pipefd[0];
897
812
898
/* Unblock SIGCHLD so signal handler can be run if this process
813
899
has already completed */
814
900
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
818
904
goto fallback;
819
905
}
820
906
821
FD_SET(new_process->fd, &rfds_all);
907
FD_SET(new_plugin->fd, &rfds_all);
822
908
823
if (maxfd < new_process->fd){
824
maxfd = new_process->fd;
909
if (maxfd < new_plugin->fd){
910
maxfd = new_plugin->fd;
825
911
}
826
827
912
}
828
829
free_plugin_list(plugin_list);
830
plugin_list = NULL;
831
913
832
914
closedir(dir);
833
915
dir = NULL;
834
835
if (process_list == NULL){
836
fprintf(stderr, "No plugin processes started. Incorrect plugin"
837
" directory?\n");
838
process_list = 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
}
839
926
}
840
while(process_list){
927
928
/* Main loop while running plugins exist */
929
while(plugin_list){
841
930
fd_set rfds = rfds_all;
842
931
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
843
932
if (select_ret == -1){
847
936
}
848
937
/* OK, now either a process completed, or something can be read
849
938
from one of them */
850
for(process *proc = process_list; proc ; proc = proc->next){
939
for(plugin *proc = plugin_list; proc != NULL;){
851
940
/* Is this process completely done? */
852
941
if(proc->eof and proc->completed){
853
942
/* Only accept the plugin output if it exited cleanly */
854
943
if(not WIFEXITED(proc->status)
855
944
or WEXITSTATUS(proc->status) != 0){
856
945
/* Bad exit by plugin */
946
857
947
if(debug){
858
948
if(WIFEXITED(proc->status)){
859
949
fprintf(stderr, "Plugin %u exited with status %d\n",
868
958
(unsigned int) (proc->pid));
869
959
}
870
960
}
961
871
962
/* Remove the plugin */
872
963
FD_CLR(proc->fd, &rfds_all);
964
873
965
/* Block signal while modifying process_list */
874
966
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
875
967
if(ret < 0){
877
969
exitstatus = EXIT_FAILURE;
878
970
goto fallback;
879
971
}
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
}
972
973
plugin *next_plugin = proc->next;
974
free_plugin(proc);
975
proc = next_plugin;
976
893
977
/* We are done modifying process list, so unblock signal */
894
978
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
895
979
NULL);
896
980
if(ret < 0){
897
981
perror("sigprocmask");
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;
982
exitstatus = EXIT_FAILURE;
983
goto fallback;
984
}
985
986
if(plugin_list == NULL){
987
break;
988
}
989
990
continue;
905
991
}
992
906
993
/* This process exited nicely, so print its buffer */
907
994
908
995
bool bret = print_out_password(proc->buffer,
909
996
proc->buffer_length);
910
997
if(not bret){
913
1000
}
914
1001
goto fallback;
915
1002
}
1003
916
1004
/* This process has not completed. Does it have any output? */
917
1005
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
918
1006
/* This process had nothing to say at this time */
1007
proc = proc->next;
919
1008
continue;
920
1009
}
921
1010
/* Before reading, make the process' data buffer large enough */
934
1023
BUFFER_SIZE);
935
1024
if(ret < 0){
936
1025
/* Read error from this process; ignore the error */
1026
proc = proc->next;
937
1027
continue;
938
1028
}
939
1029
if(ret == 0){
948
1038
949
1039
fallback:
950
1040
951
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1041
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
952
1042
/* Fallback if all plugins failed, none are found or an error
953
1043
occured */
954
1044
bool bret;
955
1045
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
956
1046
char *passwordbuffer = getpass("Password: ");
957
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
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);
958
1054
if(not bret){
959
1055
perror("print_out_password");
960
1056
exitstatus = EXIT_FAILURE;
967
1063
perror("sigaction");
968
1064
exitstatus = EXIT_FAILURE;
969
1065
}
970
1066
971
1067
if(custom_argv != NULL){
972
1068
for(char **arg = custom_argv+1; *arg != NULL; arg++){
973
1069
free(*arg);
974
1070
}
975
1071
free(custom_argv);
976
1072
}
977
free_plugin_list(plugin_list);
978
1073
979
1074
if(dir != NULL){
980
1075
closedir(dir);
981
1076
}
982
1077
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");
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
}
991
1087
}
992
free(process_list->buffer);
993
free(process_list);
994
1088
}
995
1089
996
1090
/* Wait for any remaining child processes to terminate */
1000
1094
if(errno != ECHILD){
1001
1095
perror("wait");
1002
1096
}
1003
1097
1098
free_plugin_list();
1099
1004
1100
free(plugindir);
1005
1101
free(argfile);
1006
1102
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0