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- Committer: Björn Påhlsson
- Date: 2008-08-25 01:40:19 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 107.
- Revision ID: belorn@braxen-20080825014019-p8ji8qn1bga4koao
transformed a function to a part of main
- 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 © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 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,
66
65
#include <errno.h> /* errno, EBADF */
67
66
68
67
#define BUFFER_SIZE 256
69
70
#define PDIR "/lib/mandos/plugins.d"
71
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
72
73
const char *argp_program_version = "plugin-runner " VERSION;
68
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
69
70
const char *argp_program_version = "plugin-runner 1.0";
74
71
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
75
72
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;
73
struct process;
83
74
84
/* Variables used for running processes*/
75
typedef struct process{
85
76
pid_t pid;
86
77
int fd;
87
78
char *buffer;
90
81
bool eof;
91
82
volatile bool completed;
92
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;
93
94
struct plugin *next;
94
95
} plugin;
95
96
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){
97
static plugin *getplugin(char *name, plugin **plugin_list){
98
for (plugin *p = *plugin_list; p != NULL; p = p->next){
103
99
if ((p->name == name)
104
100
or (p->name and name and (strcmp(p->name, name) == 0))){
105
101
return p;
120
116
121
117
*new_plugin = (plugin) { .name = copy_name,
122
118
.argc = 1,
119
.envc = 0,
123
120
.disabled = false,
124
.next = plugin_list };
121
.next = *plugin_list };
125
122
126
123
new_plugin->argv = malloc(sizeof(char *) * 2);
127
124
if (new_plugin->argv == NULL){
131
128
}
132
129
new_plugin->argv[0] = copy_name;
133
130
new_plugin->argv[1] = NULL;
134
131
135
132
new_plugin->environ = malloc(sizeof(char *));
136
133
if(new_plugin->environ == NULL){
137
134
free(copy_name);
140
137
return NULL;
141
138
}
142
139
new_plugin->environ[0] = NULL;
143
144
140
/* Append the new plugin to the list */
145
plugin_list = new_plugin;
141
*plugin_list = new_plugin;
146
142
return new_plugin;
147
143
}
148
144
178
174
}
179
175
180
176
/* Add to a plugin's environment */
181
static bool add_environment(plugin *p, const char *def, bool replace){
177
static bool add_environment(plugin *p, const char *def){
182
178
if(p == NULL){
183
179
return false;
184
180
}
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
181
return add_to_char_array(def, &(p->environ), &(p->envc));
203
182
}
204
183
184
205
185
/*
206
186
* Based on the example in the GNU LibC manual chapter 13.13 "File
207
187
* Descriptor Flags".
208
188
* *Note File Descriptor Flags:(libc)Descriptor Flags.
209
189
*/
210
static int set_cloexec_flag(int fd){
190
static int set_cloexec_flag(int fd)
191
{
211
192
int ret = fcntl(fd, F_GETFD, 0);
212
193
/* If reading the flags failed, return error indication now. */
213
194
if(ret < 0){
217
198
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
218
199
}
219
200
201
process *process_list = NULL;
220
202
221
203
/* Mark processes as completed when they exit, and save their exit
222
204
status. */
223
static void handle_sigchld(__attribute__((unused)) int sig){
205
void handle_sigchld(__attribute__((unused)) int sig){
224
206
while(true){
225
plugin *proc = plugin_list;
207
process *proc = process_list;
226
208
int status;
227
209
pid_t pid = waitpid(-1, &status, WNOHANG);
228
210
if(pid == 0){
236
218
/* No child processes */
237
219
break;
238
220
}
239
221
240
222
/* A child exited, find it in process_list */
241
223
while(proc != NULL and proc->pid != pid){
242
224
proc = proc->next;
250
232
}
251
233
}
252
234
253
/* Prints out a password to stdout */
254
static bool print_out_password(const char *buffer, size_t length){
235
bool print_out_password(const char *buffer, size_t length){
255
236
ssize_t ret;
237
if(length>0 and buffer[length-1] == '\n'){
238
length--;
239
}
256
240
for(size_t written = 0; written < length; written += (size_t)ret){
257
241
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
258
242
length - written));
263
247
return true;
264
248
}
265
249
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);
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);
299
262
}
300
263
}
301
264
302
265
int main(int argc, char *argv[]){
303
char *plugindir = NULL;
304
char *argfile = NULL;
266
const char *plugindir = "/lib/mandos/plugins.d";
267
const char *argfile = ARGFILE;
305
268
FILE *conffp;
306
269
size_t d_name_len;
307
270
DIR *dir = NULL;
339
302
{ .name = "global-options", .key = 'g',
340
303
.arg = "OPTION[,OPTION[,...]]",
341
304
.doc = "Options passed to all plugins" },
342
{ .name = "global-env", .key = 'G',
305
{ .name = "global-envs", .key = 'e',
343
306
.arg = "VAR=value",
344
307
.doc = "Environment variable passed to all plugins" },
345
308
{ .name = "options-for", .key = 'o',
346
309
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
347
310
.doc = "Options passed only to specified plugin" },
348
{ .name = "env-for", .key = 'E',
311
{ .name = "envs-for", .key = 'f',
349
312
.arg = "PLUGIN:ENV=value",
350
313
.doc = "Environment variable passed to specified plugin" },
351
314
{ .name = "disable", .key = 'd',
352
315
.arg = "PLUGIN",
353
316
.doc = "Disable a specific plugin", .group = 1 },
354
{ .name = "enable", .key = 'e',
355
.arg = "PLUGIN",
356
.doc = "Enable a specific plugin", .group = 1 },
357
317
{ .name = "plugin-dir", .key = 128,
358
318
.arg = "DIRECTORY",
359
319
.doc = "Specify a different plugin directory", .group = 2 },
360
{ .name = "config-file", .key = 129,
361
.arg = "FILE",
362
.doc = "Specify a different configuration file", .group = 2 },
363
{ .name = "userid", .key = 130,
364
.arg = "ID", .flags = 0,
365
.doc = "User ID the plugins will run as", .group = 3 },
366
{ .name = "groupid", .key = 131,
367
.arg = "ID", .flags = 0,
368
.doc = "Group ID the plugins will run as", .group = 3 },
369
{ .name = "debug", .key = 132,
370
.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 },
371
328
{ .name = NULL }
372
329
};
373
330
374
error_t parse_opt (int key, char *arg, __attribute__((unused))
375
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;
376
335
switch (key) {
377
case 'g': /* --global-options */
336
case 'g':
378
337
if (arg != NULL){
379
338
char *p;
380
339
while((p = strsep(&arg, ",")) != NULL){
381
340
if(p[0] == '\0'){
382
341
continue;
383
342
}
384
if(not add_argument(getplugin(NULL), p)){
343
if(not add_argument(getplugin(NULL, plugins), p)){
385
344
perror("add_argument");
386
345
return ARGP_ERR_UNKNOWN;
387
346
}
388
347
}
389
348
}
390
349
break;
391
case 'G': /* --global-env */
350
case 'e':
392
351
if(arg == NULL){
393
352
break;
394
353
}
395
if(not add_environment(getplugin(NULL), arg, true)){
396
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
}
397
362
}
398
363
break;
399
case 'o': /* --options-for */
364
case 'o':
400
365
if (arg != NULL){
401
366
char *p_name = strsep(&arg, ":");
402
if(p_name[0] == '\0' or arg == NULL){
367
if(p_name[0] == '\0'){
403
368
break;
404
369
}
405
370
char *opt = strsep(&arg, ":");
406
if(opt[0] == '\0' or opt == NULL){
371
if(opt[0] == '\0'){
407
372
break;
408
373
}
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;
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
}
417
384
}
418
385
}
419
386
}
420
387
break;
421
case 'E': /* --env-for */
388
case 'f':
422
389
if(arg == NULL){
423
390
break;
424
391
}
427
394
if(envdef == NULL){
428
395
break;
429
396
}
430
*envdef = '\0';
431
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)){
432
403
perror("add_environment");
433
404
}
434
405
}
435
406
break;
436
case 'd': /* --disable */
407
case 'd':
437
408
if (arg != NULL){
438
plugin *p = getplugin(arg);
409
plugin *p = getplugin(arg, plugins);
439
410
if(p == NULL){
440
411
return ARGP_ERR_UNKNOWN;
441
412
}
442
413
p->disabled = true;
443
414
}
444
415
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);
456
plugindir = strdup(arg);
457
if(plugindir == NULL){
458
perror("strdup");
459
}
460
break;
461
case 129: /* --config-file */
462
/* This is already done by parse_opt_config_file() */
463
break;
464
case 130: /* --userid */
416
case 128:
417
plugindir = arg;
418
break;
419
case 129:
465
420
uid = (uid_t)strtol(arg, NULL, 10);
466
421
break;
467
case 131: /* --groupid */
422
case 130:
468
423
gid = (gid_t)strtol(arg, NULL, 10);
469
424
break;
470
case 132: /* --debug */
425
case 131:
471
426
debug = true;
472
427
break;
473
428
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 = "",
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]",
525
443
.doc = "Mandos plugin runner -- Run plugins" };
526
444
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);
445
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
530
446
if (ret == ARGP_ERR_UNKNOWN){
531
447
fprintf(stderr, "Unknown error while parsing arguments\n");
532
448
exitstatus = EXIT_FAILURE;
533
449
goto fallback;
534
450
}
535
536
/* Reset to the normal argument parser */
537
argp.parser = parse_opt;
538
539
/* Open the configfile if available */
540
if (argfile == NULL){
541
conffp = fopen(AFILE, "r");
542
} else {
543
conffp = fopen(argfile, "r");
544
}
451
452
conffp = fopen(argfile, "r");
545
453
if(conffp != NULL){
546
454
char *org_line = NULL;
547
455
char *p, *arg, *new_arg, *line;
559
467
}
560
468
custom_argv[0] = argv[0];
561
469
custom_argv[1] = NULL;
562
563
/* for each line in the config file, strip whitespace and ignore
564
commented text */
470
565
471
while(true){
566
472
sret = getline(&org_line, &size, conffp);
567
473
if(sret == -1){
575
481
continue;
576
482
}
577
483
new_arg = strdup(p);
578
if(new_arg == NULL){
579
perror("strdup");
580
exitstatus = EXIT_FAILURE;
581
free(org_line);
582
goto fallback;
583
}
584
484
585
485
custom_argc += 1;
586
486
custom_argv = realloc(custom_argv, sizeof(char *)
587
487
* ((unsigned int) custom_argc + 1));
596
496
}
597
497
}
598
498
free(org_line);
599
} else {
499
} else{
600
500
/* Check for harmful errors and go to fallback. Other errors might
601
501
not affect opening plugins */
602
502
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
605
505
goto fallback;
606
506
}
607
507
}
608
/* If there was any arguments from configuration file,
609
pass them to parser as command arguments */
508
610
509
if(custom_argv != NULL){
611
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
612
0, NULL);
510
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
613
511
if (ret == ARGP_ERR_UNKNOWN){
614
512
fprintf(stderr, "Unknown error while parsing arguments\n");
615
513
exitstatus = EXIT_FAILURE;
617
515
}
618
516
}
619
517
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
518
if(debug){
630
519
for(plugin *p = plugin_list; p != NULL; p=p->next){
631
520
fprintf(stderr, "Plugin: %s has %d arguments\n",
640
529
}
641
530
}
642
531
643
/* Strip permissions down to nobody */
644
532
ret = setuid(uid);
645
533
if (ret == -1){
646
534
perror("setuid");
647
}
535
}
536
648
537
setgid(gid);
649
538
if (ret == -1){
650
539
perror("setgid");
651
540
}
652
541
653
if (plugindir == NULL){
654
dir = opendir(PDIR);
655
} else {
656
dir = opendir(plugindir);
657
}
658
542
dir = opendir(plugindir);
659
543
if(dir == NULL){
660
544
perror("Could not open plugin dir");
661
545
exitstatus = EXIT_FAILURE;
677
561
678
562
FD_ZERO(&rfds_all);
679
563
680
/* Read and execute any executable in the plugin directory*/
681
564
while(true){
682
565
dirst = readdir(dir);
683
566
684
/* All directory entries have been processed */
567
// All directory entries have been processed
685
568
if(dirst == NULL){
686
569
if (errno == EBADF){
687
570
perror("readdir");
693
576
694
577
d_name_len = strlen(dirst->d_name);
695
578
696
/* Ignore dotfiles, backup files and other junk */
579
// Ignore dotfiles, backup files and other junk
697
580
{
698
581
bool bad_name = false;
699
582
701
584
702
585
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
703
586
".dpkg-old",
704
".dpkg-bak",
705
587
".dpkg-divert", NULL };
706
588
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
707
589
size_t pre_len = strlen(*pre);
715
597
break;
716
598
}
717
599
}
600
718
601
if(bad_name){
719
602
continue;
720
603
}
604
721
605
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
722
606
size_t suf_len = strlen(*suf);
723
607
if((d_name_len >= suf_len)
738
622
}
739
623
740
624
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
}
625
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
746
626
if(ret < 0){
747
627
perror("asprintf");
748
628
continue;
754
634
free(filename);
755
635
continue;
756
636
}
757
758
/* Ignore non-executable files */
637
759
638
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
760
639
if(debug){
761
640
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
764
643
free(filename);
765
644
continue;
766
645
}
767
768
plugin *p = getplugin(dirst->d_name);
646
plugin *p = getplugin(dirst->d_name, &plugin_list);
769
647
if(p == NULL){
770
648
perror("getplugin");
771
649
free(filename);
781
659
}
782
660
{
783
661
/* Add global arguments to argument list for this plugin */
784
plugin *g = getplugin(NULL);
662
plugin *g = getplugin(NULL, &plugin_list);
785
663
if(g != NULL){
786
664
for(char **a = g->argv + 1; *a != NULL; a++){
787
665
if(not add_argument(p, *a)){
790
668
}
791
669
/* Add global environment variables */
792
670
for(char **e = g->environ; *e != NULL; e++){
793
if(not add_environment(p, *e, false)){
671
if(not add_environment(p, *e)){
794
672
perror("add_environment");
795
673
}
796
674
}
801
679
process, too. */
802
680
if(p->environ[0] != NULL){
803
681
for(char **e = environ; *e != NULL; e++){
804
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)){
805
688
perror("add_environment");
806
689
}
807
690
}
814
697
exitstatus = EXIT_FAILURE;
815
698
goto fallback;
816
699
}
817
/* Ask OS to automatic close the pipe on exec */
818
700
ret = set_cloexec_flag(pipefd[0]);
819
701
if(ret < 0){
820
702
perror("set_cloexec_flag");
834
716
exitstatus = EXIT_FAILURE;
835
717
goto fallback;
836
718
}
837
/* Starting a new process to be watched */
719
// Starting a new process to be watched
838
720
pid_t pid = fork();
839
721
if(pid == -1){
840
722
perror("fork");
848
730
perror("sigaction");
849
731
_exit(EXIT_FAILURE);
850
732
}
851
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
733
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
852
734
if(ret < 0){
853
735
perror("sigprocmask");
854
736
_exit(EXIT_FAILURE);
855
737
}
856
738
857
739
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
858
740
if(ret == -1){
859
741
perror("dup2");
878
760
}
879
761
/* no return */
880
762
}
881
/* Parent process */
882
close(pipefd[1]); /* Close unused write end of pipe */
763
/* parent process */
883
764
free(filename);
884
plugin *new_plugin = getplugin(dirst->d_name);
885
if (new_plugin == NULL){
886
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");
887
769
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
888
770
if(ret < 0){
889
perror("sigprocmask");
771
perror("sigprocmask");
890
772
}
891
773
exitstatus = EXIT_FAILURE;
892
774
goto fallback;
893
775
}
894
776
895
new_plugin->pid = pid;
896
new_plugin->fd = pipefd[0];
897
777
*new_process = (struct process){ .pid = pid,
778
.fd = pipefd[0],
779
.next = process_list };
780
// List handling
781
process_list = new_process;
898
782
/* Unblock SIGCHLD so signal handler can be run if this process
899
783
has already completed */
900
784
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
904
788
goto fallback;
905
789
}
906
790
907
FD_SET(new_plugin->fd, &rfds_all);
791
FD_SET(new_process->fd, &rfds_all);
908
792
909
if (maxfd < new_plugin->fd){
910
maxfd = new_plugin->fd;
793
if (maxfd < new_process->fd){
794
maxfd = new_process->fd;
911
795
}
796
912
797
}
913
798
799
free_plugin_list(plugin_list);
800
plugin_list = NULL;
801
914
802
closedir(dir);
915
803
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
}
804
805
if (process_list == NULL){
806
fprintf(stderr, "No plugin processes started. Incorrect plugin"
807
" directory?\n");
808
process_list = NULL;
926
809
}
927
928
/* Main loop while running plugins exist */
929
while(plugin_list){
810
while(process_list){
930
811
fd_set rfds = rfds_all;
931
812
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
932
813
if (select_ret == -1){
936
817
}
937
818
/* OK, now either a process completed, or something can be read
938
819
from one of them */
939
for(plugin *proc = plugin_list; proc != NULL;){
820
for(process *proc = process_list; proc ; proc = proc->next){
940
821
/* Is this process completely done? */
941
822
if(proc->eof and proc->completed){
942
823
/* Only accept the plugin output if it exited cleanly */
943
824
if(not WIFEXITED(proc->status)
944
825
or WEXITSTATUS(proc->status) != 0){
945
826
/* Bad exit by plugin */
946
947
827
if(debug){
948
828
if(WIFEXITED(proc->status)){
949
829
fprintf(stderr, "Plugin %u exited with status %d\n",
958
838
(unsigned int) (proc->pid));
959
839
}
960
840
}
961
962
841
/* Remove the plugin */
963
842
FD_CLR(proc->fd, &rfds_all);
964
965
843
/* Block signal while modifying process_list */
966
844
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
967
845
if(ret < 0){
969
847
exitstatus = EXIT_FAILURE;
970
848
goto fallback;
971
849
}
972
973
plugin *next_plugin = proc->next;
974
free_plugin(proc);
975
proc = next_plugin;
976
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
}
977
863
/* We are done modifying process list, so unblock signal */
978
864
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
979
865
NULL);
980
866
if(ret < 0){
981
867
perror("sigprocmask");
982
exitstatus = EXIT_FAILURE;
983
goto fallback;
984
}
985
986
if(plugin_list == NULL){
987
break;
988
}
989
990
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;
991
875
}
992
993
876
/* This process exited nicely, so print its buffer */
994
877
995
878
bool bret = print_out_password(proc->buffer,
996
879
proc->buffer_length);
997
880
if(not bret){
1000
883
}
1001
884
goto fallback;
1002
885
}
1003
1004
886
/* This process has not completed. Does it have any output? */
1005
887
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1006
888
/* This process had nothing to say at this time */
1007
proc = proc->next;
1008
889
continue;
1009
890
}
1010
891
/* Before reading, make the process' data buffer large enough */
1023
904
BUFFER_SIZE);
1024
905
if(ret < 0){
1025
906
/* Read error from this process; ignore the error */
1026
proc = proc->next;
1027
907
continue;
1028
908
}
1029
909
if(ret == 0){
1038
918
1039
919
fallback:
1040
920
1041
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
921
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1042
922
/* Fallback if all plugins failed, none are found or an error
1043
923
occured */
1044
924
bool bret;
1045
925
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1046
926
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);
927
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1054
928
if(not bret){
1055
929
perror("print_out_password");
1056
930
exitstatus = EXIT_FAILURE;
1063
937
perror("sigaction");
1064
938
exitstatus = EXIT_FAILURE;
1065
939
}
1066
940
1067
941
if(custom_argv != NULL){
1068
942
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1069
943
free(*arg);
1070
944
}
1071
945
free(custom_argv);
1072
946
}
947
free_plugin_list(plugin_list);
1073
948
1074
949
if(dir != NULL){
1075
950
closedir(dir);
1076
951
}
1077
952
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
}
953
/* Free the process list and kill the processes */
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");
1087
961
}
962
free(process_list->buffer);
963
free(process_list);
1088
964
}
1089
965
1090
966
/* Wait for any remaining child processes to terminate */
1095
971
perror("wait");
1096
972
}
1097
973
1098
free_plugin_list();
1099
1100
free(plugindir);
1101
free(argfile);
1102
1103
974
return exitstatus;
1104
975
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0