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- Committer: Björn Påhlsson
- Date: 2008-08-25 01:40:55 UTC
- mfrom: (103 mandos)
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 107.
- Revision ID: belorn@braxen-20080825014055-pv5v6vqwb7wjmxqx
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:
- 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,
65
65
#include <errno.h> /* errno, EBADF */
66
66
67
67
#define BUFFER_SIZE 256
68
69
#define PDIR "/lib/mandos/plugins.d"
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
69
72
70
const char *argp_program_version = "plugin-runner 1.0";
73
71
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
72
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;
73
struct process;
82
74
83
/* Variables used for running processes*/
75
typedef struct process{
84
76
pid_t pid;
85
77
int fd;
86
78
char *buffer;
89
81
bool eof;
90
82
volatile bool completed;
91
83
volatile int status;
84
struct process *next;
85
} process;
86
87
typedef struct plugin{
88
char *name; /* can be NULL or any plugin name */
89
char **argv;
90
int argc;
91
char **environ;
92
int envc;
93
bool disabled;
92
94
struct plugin *next;
93
95
} plugin;
94
96
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){
97
static plugin *getplugin(char *name, plugin **plugin_list){
98
for (plugin *p = *plugin_list; p != NULL; p = p->next){
102
99
if ((p->name == name)
103
100
or (p->name and name and (strcmp(p->name, name) == 0))){
104
101
return p;
119
116
120
117
*new_plugin = (plugin) { .name = copy_name,
121
118
.argc = 1,
119
.envc = 0,
122
120
.disabled = false,
123
.next = plugin_list };
121
.next = *plugin_list };
124
122
125
123
new_plugin->argv = malloc(sizeof(char *) * 2);
126
124
if (new_plugin->argv == NULL){
130
128
}
131
129
new_plugin->argv[0] = copy_name;
132
130
new_plugin->argv[1] = NULL;
133
131
134
132
new_plugin->environ = malloc(sizeof(char *));
135
133
if(new_plugin->environ == NULL){
136
134
free(copy_name);
139
137
return NULL;
140
138
}
141
139
new_plugin->environ[0] = NULL;
142
143
140
/* Append the new plugin to the list */
144
plugin_list = new_plugin;
141
*plugin_list = new_plugin;
145
142
return new_plugin;
146
143
}
147
144
177
174
}
178
175
179
176
/* Add to a plugin's environment */
180
static bool add_environment(plugin *p, const char *def, bool replace){
177
static bool add_environment(plugin *p, const char *def){
181
178
if(p == NULL){
182
179
return false;
183
180
}
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
181
return add_to_char_array(def, &(p->environ), &(p->envc));
202
182
}
203
183
184
204
185
/*
205
186
* Based on the example in the GNU LibC manual chapter 13.13 "File
206
187
* Descriptor Flags".
207
188
* *Note File Descriptor Flags:(libc)Descriptor Flags.
208
189
*/
209
static int set_cloexec_flag(int fd){
190
static int set_cloexec_flag(int fd)
191
{
210
192
int ret = fcntl(fd, F_GETFD, 0);
211
193
/* If reading the flags failed, return error indication now. */
212
194
if(ret < 0){
216
198
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
217
199
}
218
200
201
process *process_list = NULL;
219
202
220
203
/* Mark processes as completed when they exit, and save their exit
221
204
status. */
222
static void handle_sigchld(__attribute__((unused)) int sig){
205
void handle_sigchld(__attribute__((unused)) int sig){
223
206
while(true){
224
plugin *proc = plugin_list;
207
process *proc = process_list;
225
208
int status;
226
209
pid_t pid = waitpid(-1, &status, WNOHANG);
227
210
if(pid == 0){
235
218
/* No child processes */
236
219
break;
237
220
}
238
221
239
222
/* A child exited, find it in process_list */
240
223
while(proc != NULL and proc->pid != pid){
241
224
proc = proc->next;
249
232
}
250
233
}
251
234
252
/* Prints out a password to stdout */
253
static bool print_out_password(const char *buffer, size_t length){
235
bool print_out_password(const char *buffer, size_t length){
254
236
ssize_t ret;
237
if(length>0 and buffer[length-1] == '\n'){
238
length--;
239
}
255
240
for(size_t written = 0; written < length; written += (size_t)ret){
256
241
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
257
242
length - written));
262
247
return true;
263
248
}
264
249
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);
250
static void free_plugin_list(plugin *plugin_list){
251
for(plugin *next; plugin_list != NULL; plugin_list = next){
252
next = plugin_list->next;
253
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
254
free(*arg);
255
}
256
free(plugin_list->argv);
257
for(char **env = plugin_list->environ; *env != NULL; env++){
258
free(*env);
259
}
260
free(plugin_list->environ);
261
free(plugin_list);
298
262
}
299
263
}
300
264
301
265
int main(int argc, char *argv[]){
302
char *plugindir = NULL;
303
char *argfile = NULL;
266
const char *plugindir = "/lib/mandos/plugins.d";
267
const char *argfile = ARGFILE;
304
268
FILE *conffp;
305
269
size_t d_name_len;
306
270
DIR *dir = NULL;
338
302
{ .name = "global-options", .key = 'g',
339
303
.arg = "OPTION[,OPTION[,...]]",
340
304
.doc = "Options passed to all plugins" },
341
{ .name = "global-env", .key = 'G',
305
{ .name = "global-envs", .key = 'e',
342
306
.arg = "VAR=value",
343
307
.doc = "Environment variable passed to all plugins" },
344
308
{ .name = "options-for", .key = 'o',
345
309
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
346
310
.doc = "Options passed only to specified plugin" },
347
{ .name = "env-for", .key = 'E',
311
{ .name = "envs-for", .key = 'f',
348
312
.arg = "PLUGIN:ENV=value",
349
313
.doc = "Environment variable passed to specified plugin" },
350
314
{ .name = "disable", .key = 'd',
351
315
.arg = "PLUGIN",
352
316
.doc = "Disable a specific plugin", .group = 1 },
353
{ .name = "enable", .key = 'e',
354
.arg = "PLUGIN",
355
.doc = "Enable a specific plugin", .group = 1 },
356
317
{ .name = "plugin-dir", .key = 128,
357
318
.arg = "DIRECTORY",
358
319
.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 },
320
{ .name = "userid", .key = 129,
321
.arg = "ID", .flags = 0,
322
.doc = "User ID the plugins will run as", .group = 2 },
323
{ .name = "groupid", .key = 130,
324
.arg = "ID", .flags = 0,
325
.doc = "Group ID the plugins will run as", .group = 2 },
326
{ .name = "debug", .key = 131,
327
.doc = "Debug mode", .group = 3 },
370
328
{ .name = NULL }
371
329
};
372
330
373
error_t parse_opt (int key, char *arg, __attribute__((unused))
374
struct argp_state *state) {
331
error_t parse_opt (int key, char *arg, struct argp_state *state) {
332
/* Get the INPUT argument from `argp_parse', which we know is a
333
pointer to our plugin list pointer. */
334
plugin **plugins = state->input;
375
335
switch (key) {
376
case 'g': /* --global-options */
336
case 'g':
377
337
if (arg != NULL){
378
338
char *p;
379
339
while((p = strsep(&arg, ",")) != NULL){
380
340
if(p[0] == '\0'){
381
341
continue;
382
342
}
383
if(not add_argument(getplugin(NULL), p)){
343
if(not add_argument(getplugin(NULL, plugins), p)){
384
344
perror("add_argument");
385
345
return ARGP_ERR_UNKNOWN;
386
346
}
387
347
}
388
348
}
389
349
break;
390
case 'G': /* --global-env */
350
case 'e':
391
351
if(arg == NULL){
392
352
break;
393
353
}
394
if(not add_environment(getplugin(NULL), arg, true)){
395
perror("add_environment");
354
{
355
char *envdef = strdup(arg);
356
if(envdef == NULL){
357
break;
358
}
359
if(not add_environment(getplugin(NULL, plugins), envdef)){
360
perror("add_environment");
361
}
396
362
}
397
363
break;
398
case 'o': /* --options-for */
364
case 'o':
399
365
if (arg != NULL){
400
366
char *p_name = strsep(&arg, ":");
401
if(p_name[0] == '\0' or arg == NULL){
367
if(p_name[0] == '\0'){
402
368
break;
403
369
}
404
370
char *opt = strsep(&arg, ":");
405
if(opt[0] == '\0' or opt == NULL){
371
if(opt[0] == '\0'){
406
372
break;
407
373
}
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;
374
if(opt != NULL){
375
char *p;
376
while((p = strsep(&opt, ",")) != NULL){
377
if(p[0] == '\0'){
378
continue;
379
}
380
if(not add_argument(getplugin(p_name, plugins), p)){
381
perror("add_argument");
382
return ARGP_ERR_UNKNOWN;
383
}
416
384
}
417
385
}
418
386
}
419
387
break;
420
case 'E': /* --env-for */
388
case 'f':
421
389
if(arg == NULL){
422
390
break;
423
391
}
426
394
if(envdef == NULL){
427
395
break;
428
396
}
429
*envdef = '\0';
430
if(not add_environment(getplugin(arg), envdef+1, true)){
397
char *p_name = strndup(arg, (size_t) (envdef-arg));
398
if(p_name == NULL){
399
break;
400
}
401
envdef++;
402
if(not add_environment(getplugin(p_name, plugins), envdef)){
431
403
perror("add_environment");
432
404
}
433
405
}
434
406
break;
435
case 'd': /* --disable */
407
case 'd':
436
408
if (arg != NULL){
437
plugin *p = getplugin(arg);
409
plugin *p = getplugin(arg, plugins);
438
410
if(p == NULL){
439
411
return ARGP_ERR_UNKNOWN;
440
412
}
441
413
p->disabled = true;
442
414
}
443
415
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 */
416
case 128:
417
plugindir = arg;
418
break;
419
case 129:
464
420
uid = (uid_t)strtol(arg, NULL, 10);
465
421
break;
466
case 131: /* --groupid */
422
case 130:
467
423
gid = (gid_t)strtol(arg, NULL, 10);
468
424
break;
469
case 132: /* --debug */
425
case 131:
470
426
debug = true;
471
427
break;
472
428
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 = "",
429
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
430
break;
431
case ARGP_KEY_END:
432
break;
433
default:
434
return ARGP_ERR_UNKNOWN;
435
}
436
return 0;
437
}
438
439
plugin *plugin_list = NULL;
440
441
struct argp argp = { .options = options, .parser = parse_opt,
442
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
524
443
.doc = "Mandos plugin runner -- Run plugins" };
525
444
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);
445
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
529
446
if (ret == ARGP_ERR_UNKNOWN){
530
447
fprintf(stderr, "Unknown error while parsing arguments\n");
531
448
exitstatus = EXIT_FAILURE;
532
449
goto fallback;
533
450
}
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
}
451
452
conffp = fopen(argfile, "r");
544
453
if(conffp != NULL){
545
454
char *org_line = NULL;
546
455
char *p, *arg, *new_arg, *line;
558
467
}
559
468
custom_argv[0] = argv[0];
560
469
custom_argv[1] = NULL;
561
562
/* for each line in the config file, strip whitespace and ignore
563
commented text */
470
564
471
while(true){
565
472
sret = getline(&org_line, &size, conffp);
566
473
if(sret == -1){
574
481
continue;
575
482
}
576
483
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
484
584
485
custom_argc += 1;
585
486
custom_argv = realloc(custom_argv, sizeof(char *)
586
487
* ((unsigned int) custom_argc + 1));
595
496
}
596
497
}
597
498
free(org_line);
598
} else {
499
} else{
599
500
/* Check for harmful errors and go to fallback. Other errors might
600
501
not affect opening plugins */
601
502
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
604
505
goto fallback;
605
506
}
606
507
}
607
/* If there was any arguments from configuration file,
608
pass them to parser as command arguments */
508
609
509
if(custom_argv != NULL){
610
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
611
0, NULL);
510
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
612
511
if (ret == ARGP_ERR_UNKNOWN){
613
512
fprintf(stderr, "Unknown error while parsing arguments\n");
614
513
exitstatus = EXIT_FAILURE;
616
515
}
617
516
}
618
517
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
518
if(debug){
629
519
for(plugin *p = plugin_list; p != NULL; p=p->next){
630
520
fprintf(stderr, "Plugin: %s has %d arguments\n",
639
529
}
640
530
}
641
531
642
/* Strip permissions down to nobody */
643
532
ret = setuid(uid);
644
533
if (ret == -1){
645
534
perror("setuid");
646
}
535
}
536
647
537
setgid(gid);
648
538
if (ret == -1){
649
539
perror("setgid");
650
540
}
651
541
652
if (plugindir == NULL){
653
dir = opendir(PDIR);
654
} else {
655
dir = opendir(plugindir);
656
}
657
542
dir = opendir(plugindir);
658
543
if(dir == NULL){
659
544
perror("Could not open plugin dir");
660
545
exitstatus = EXIT_FAILURE;
676
561
677
562
FD_ZERO(&rfds_all);
678
563
679
/* Read and execute any executable in the plugin directory*/
680
564
while(true){
681
565
dirst = readdir(dir);
682
566
683
/* All directory entries have been processed */
567
// All directory entries have been processed
684
568
if(dirst == NULL){
685
569
if (errno == EBADF){
686
570
perror("readdir");
692
576
693
577
d_name_len = strlen(dirst->d_name);
694
578
695
/* Ignore dotfiles, backup files and other junk */
579
// Ignore dotfiles, backup files and other junk
696
580
{
697
581
bool bad_name = false;
698
582
713
597
break;
714
598
}
715
599
}
600
716
601
if(bad_name){
717
602
continue;
718
603
}
604
719
605
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
720
606
size_t suf_len = strlen(*suf);
721
607
if((d_name_len >= suf_len)
736
622
}
737
623
738
624
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
}
625
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
744
626
if(ret < 0){
745
627
perror("asprintf");
746
628
continue;
752
634
free(filename);
753
635
continue;
754
636
}
755
756
/* Ignore non-executable files */
637
757
638
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
758
639
if(debug){
759
640
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
762
643
free(filename);
763
644
continue;
764
645
}
765
766
plugin *p = getplugin(dirst->d_name);
646
plugin *p = getplugin(dirst->d_name, &plugin_list);
767
647
if(p == NULL){
768
648
perror("getplugin");
769
649
free(filename);
779
659
}
780
660
{
781
661
/* Add global arguments to argument list for this plugin */
782
plugin *g = getplugin(NULL);
662
plugin *g = getplugin(NULL, &plugin_list);
783
663
if(g != NULL){
784
664
for(char **a = g->argv + 1; *a != NULL; a++){
785
665
if(not add_argument(p, *a)){
788
668
}
789
669
/* Add global environment variables */
790
670
for(char **e = g->environ; *e != NULL; e++){
791
if(not add_environment(p, *e, false)){
671
if(not add_environment(p, *e)){
792
672
perror("add_environment");
793
673
}
794
674
}
799
679
process, too. */
800
680
if(p->environ[0] != NULL){
801
681
for(char **e = environ; *e != NULL; e++){
802
if(not add_environment(p, *e, false)){
682
char *copy = strdup(*e);
683
if(copy == NULL){
684
perror("strdup");
685
continue;
686
}
687
if(not add_environment(p, copy)){
803
688
perror("add_environment");
804
689
}
805
690
}
812
697
exitstatus = EXIT_FAILURE;
813
698
goto fallback;
814
699
}
815
/* Ask OS to automatic close the pipe on exec */
816
700
ret = set_cloexec_flag(pipefd[0]);
817
701
if(ret < 0){
818
702
perror("set_cloexec_flag");
832
716
exitstatus = EXIT_FAILURE;
833
717
goto fallback;
834
718
}
835
/* Starting a new process to be watched */
719
// Starting a new process to be watched
836
720
pid_t pid = fork();
837
721
if(pid == -1){
838
722
perror("fork");
876
760
}
877
761
/* no return */
878
762
}
879
/* Parent process */
880
close(pipefd[1]); /* Close unused write end of pipe */
763
/* parent process */
881
764
free(filename);
882
plugin *new_plugin = getplugin(dirst->d_name);
883
if (new_plugin == NULL){
884
perror("getplugin");
765
close(pipefd[1]); /* close unused write end of pipe */
766
process *new_process = malloc(sizeof(process));
767
if (new_process == NULL){
768
perror("malloc");
885
769
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
886
770
if(ret < 0){
887
perror("sigprocmask");
771
perror("sigprocmask");
888
772
}
889
773
exitstatus = EXIT_FAILURE;
890
774
goto fallback;
891
775
}
892
776
893
new_plugin->pid = pid;
894
new_plugin->fd = pipefd[0];
895
777
*new_process = (struct process){ .pid = pid,
778
.fd = pipefd[0],
779
.next = process_list };
780
// List handling
781
process_list = new_process;
896
782
/* Unblock SIGCHLD so signal handler can be run if this process
897
783
has already completed */
898
784
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
902
788
goto fallback;
903
789
}
904
790
905
FD_SET(new_plugin->fd, &rfds_all);
791
FD_SET(new_process->fd, &rfds_all);
906
792
907
if (maxfd < new_plugin->fd){
908
maxfd = new_plugin->fd;
793
if (maxfd < new_process->fd){
794
maxfd = new_process->fd;
909
795
}
910
796
911
797
}
912
798
799
free_plugin_list(plugin_list);
800
plugin_list = NULL;
801
913
802
closedir(dir);
914
803
dir = NULL;
915
916
for(plugin *p = plugin_list; p != NULL; p = p->next){
917
if(p->pid != 0){
918
break;
919
}
920
if(p->next == NULL){
921
fprintf(stderr, "No plugin processes started. Incorrect plugin"
922
" directory?\n");
923
free_plugin_list();
924
}
804
805
if (process_list == NULL){
806
fprintf(stderr, "No plugin processes started. Incorrect plugin"
807
" directory?\n");
808
process_list = NULL;
925
809
}
926
927
/* Main loop while running plugins exist */
928
while(plugin_list){
810
while(process_list){
929
811
fd_set rfds = rfds_all;
930
812
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
931
813
if (select_ret == -1){
935
817
}
936
818
/* OK, now either a process completed, or something can be read
937
819
from one of them */
938
for(plugin *proc = plugin_list; proc != NULL;){
820
for(process *proc = process_list; proc ; proc = proc->next){
939
821
/* Is this process completely done? */
940
822
if(proc->eof and proc->completed){
941
823
/* Only accept the plugin output if it exited cleanly */
942
824
if(not WIFEXITED(proc->status)
943
825
or WEXITSTATUS(proc->status) != 0){
944
826
/* Bad exit by plugin */
945
946
827
if(debug){
947
828
if(WIFEXITED(proc->status)){
948
829
fprintf(stderr, "Plugin %u exited with status %d\n",
957
838
(unsigned int) (proc->pid));
958
839
}
959
840
}
960
961
841
/* Remove the plugin */
962
842
FD_CLR(proc->fd, &rfds_all);
963
964
843
/* Block signal while modifying process_list */
965
844
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
966
845
if(ret < 0){
968
847
exitstatus = EXIT_FAILURE;
969
848
goto fallback;
970
849
}
971
850
/* Delete this process entry from the list */
851
if(process_list == proc){
852
/* First one - simple */
853
process_list = proc->next;
854
} else {
855
/* Second one or later */
856
for(process *p = process_list; p != NULL; p = p->next){
857
if(p->next == proc){
858
p->next = proc->next;
859
break;
860
}
861
}
862
}
972
863
/* We are done modifying process list, so unblock signal */
973
864
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
974
865
NULL);
975
866
if(ret < 0){
976
867
perror("sigprocmask");
977
exitstatus = EXIT_FAILURE;
978
goto fallback;
979
}
980
981
if(plugin_list == NULL){
982
break;
983
}
984
985
plugin *next_plugin = proc->next;
986
free_plugin(proc);
987
proc = next_plugin;
988
continue;
868
}
869
free(proc->buffer);
870
free(proc);
871
/* We deleted this process from the list, so we can't go
872
proc->next. Therefore, start over from the beginning of
873
the process list */
874
break;
989
875
}
990
991
876
/* This process exited nicely, so print its buffer */
992
877
993
878
bool bret = print_out_password(proc->buffer,
998
883
}
999
884
goto fallback;
1000
885
}
1001
1002
886
/* This process has not completed. Does it have any output? */
1003
887
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1004
888
/* This process had nothing to say at this time */
1005
proc = proc->next;
1006
889
continue;
1007
890
}
1008
891
/* Before reading, make the process' data buffer large enough */
1021
904
BUFFER_SIZE);
1022
905
if(ret < 0){
1023
906
/* Read error from this process; ignore the error */
1024
proc = proc->next;
1025
907
continue;
1026
908
}
1027
909
if(ret == 0){
1036
918
1037
919
fallback:
1038
920
1039
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
921
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1040
922
/* Fallback if all plugins failed, none are found or an error
1041
923
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;
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
953
/* Free the process list and 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
}
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 */
1092
970
if(errno != ECHILD){
1093
971
perror("wait");
1094
972
}
1095
1096
free_plugin_list();
1097
1098
free(plugindir);
1099
free(argfile);
1100
973
1101
974
return exitstatus;
1102
975
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0