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- Committer: Teddy Hogeborn
- Date: 2008-11-01 02:26:00 UTC
- Revision ID: teddy@fukt.bsnet.se-20081101022600-bacs9fxmsliqrah1
* initramfs-tools-hook: Also ignore plugins named "*.dpkg-bak".
* plugin-runner.c: - '' -
* plugin-runner.c: - '' -
- 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 & 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, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
30
#include <stdio.h> /* perror, fileno(), fprintf(),
31
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
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
69
70
const char *argp_program_version = "plugin-runner 1.0";
68
69
#define PDIR "/lib/mandos/plugins.d"
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
72
const char *argp_program_version = "plugin-runner " VERSION;
71
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
72
74
73
struct process;
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;
74
82
75
typedef struct process{
83
/* Variables used for running processes*/
76
84
pid_t pid;
77
85
int fd;
78
86
char *buffer;
81
89
bool eof;
82
90
volatile bool completed;
83
91
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;
94
92
struct plugin *next;
95
93
} plugin;
96
94
97
static plugin *getplugin(char *name, plugin **plugin_list){
98
for (plugin *p = *plugin_list; p != NULL; p = p->next){
95
static plugin *plugin_list = NULL;
96
97
/* Gets an existing plugin based on name,
98
or if none is found, creates a new one */
99
static plugin *getplugin(char *name){
100
/* Check for exiting plugin with that name */
101
for (plugin *p = plugin_list; p != NULL; p = p->next){
99
102
if ((p->name == name)
100
103
or (p->name and name and (strcmp(p->name, name) == 0))){
101
104
return p;
116
119
117
120
*new_plugin = (plugin) { .name = copy_name,
118
121
.argc = 1,
119
.envc = 0,
120
122
.disabled = false,
121
.next = *plugin_list };
123
.next = plugin_list };
122
124
123
125
new_plugin->argv = malloc(sizeof(char *) * 2);
124
126
if (new_plugin->argv == NULL){
128
130
}
129
131
new_plugin->argv[0] = copy_name;
130
132
new_plugin->argv[1] = NULL;
131
133
132
134
new_plugin->environ = malloc(sizeof(char *));
133
135
if(new_plugin->environ == NULL){
134
136
free(copy_name);
137
139
return NULL;
138
140
}
139
141
new_plugin->environ[0] = NULL;
142
140
143
/* Append the new plugin to the list */
141
*plugin_list = new_plugin;
144
plugin_list = new_plugin;
142
145
return new_plugin;
143
146
}
144
147
174
177
}
175
178
176
179
/* Add to a plugin's environment */
177
static bool add_environment(plugin *p, const char *def){
180
static bool add_environment(plugin *p, const char *def, bool replace){
178
181
if(p == NULL){
179
182
return false;
180
183
}
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
}
181
201
return add_to_char_array(def, &(p->environ), &(p->envc));
182
202
}
183
203
184
185
204
/*
186
205
* Based on the example in the GNU LibC manual chapter 13.13 "File
187
206
* Descriptor Flags".
188
207
* *Note File Descriptor Flags:(libc)Descriptor Flags.
189
208
*/
190
static int set_cloexec_flag(int fd)
191
{
209
static int set_cloexec_flag(int fd){
192
210
int ret = fcntl(fd, F_GETFD, 0);
193
211
/* If reading the flags failed, return error indication now. */
194
212
if(ret < 0){
198
216
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
199
217
}
200
218
201
process *process_list = NULL;
202
219
203
220
/* Mark processes as completed when they exit, and save their exit
204
221
status. */
205
void handle_sigchld(__attribute__((unused)) int sig){
222
static void handle_sigchld(__attribute__((unused)) int sig){
206
223
while(true){
207
process *proc = process_list;
224
plugin *proc = plugin_list;
208
225
int status;
209
226
pid_t pid = waitpid(-1, &status, WNOHANG);
210
227
if(pid == 0){
218
235
/* No child processes */
219
236
break;
220
237
}
221
238
222
239
/* A child exited, find it in process_list */
223
240
while(proc != NULL and proc->pid != pid){
224
241
proc = proc->next;
232
249
}
233
250
}
234
251
235
bool print_out_password(const char *buffer, size_t length){
252
/* Prints out a password to stdout */
253
static bool print_out_password(const char *buffer, size_t length){
236
254
ssize_t ret;
237
if(length>0 and buffer[length-1] == '\n'){
238
length--;
239
}
240
255
for(size_t written = 0; written < length; written += (size_t)ret){
241
256
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
242
257
length - written));
247
262
return true;
248
263
}
249
264
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);
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);
262
298
}
263
299
}
264
300
265
301
int main(int argc, char *argv[]){
266
const char *plugindir = "/lib/mandos/plugins.d";
267
const char *argfile = ARGFILE;
302
char *plugindir = NULL;
303
char *argfile = NULL;
268
304
FILE *conffp;
269
305
size_t d_name_len;
270
306
DIR *dir = NULL;
302
338
{ .name = "global-options", .key = 'g',
303
339
.arg = "OPTION[,OPTION[,...]]",
304
340
.doc = "Options passed to all plugins" },
305
{ .name = "global-envs", .key = 'e',
341
{ .name = "global-env", .key = 'G',
306
342
.arg = "VAR=value",
307
343
.doc = "Environment variable passed to all plugins" },
308
344
{ .name = "options-for", .key = 'o',
309
345
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
310
346
.doc = "Options passed only to specified plugin" },
311
{ .name = "envs-for", .key = 'f',
347
{ .name = "env-for", .key = 'E',
312
348
.arg = "PLUGIN:ENV=value",
313
349
.doc = "Environment variable passed to specified plugin" },
314
350
{ .name = "disable", .key = 'd',
315
351
.arg = "PLUGIN",
316
352
.doc = "Disable a specific plugin", .group = 1 },
353
{ .name = "enable", .key = 'e',
354
.arg = "PLUGIN",
355
.doc = "Enable a specific plugin", .group = 1 },
317
356
{ .name = "plugin-dir", .key = 128,
318
357
.arg = "DIRECTORY",
319
358
.doc = "Specify a different plugin directory", .group = 2 },
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 },
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 },
328
370
{ .name = NULL }
329
371
};
330
372
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;
373
error_t parse_opt (int key, char *arg, __attribute__((unused))
374
struct argp_state *state) {
335
375
switch (key) {
336
case 'g':
376
case 'g': /* --global-options */
337
377
if (arg != NULL){
338
378
char *p;
339
379
while((p = strsep(&arg, ",")) != NULL){
340
380
if(p[0] == '\0'){
341
381
continue;
342
382
}
343
if(not add_argument(getplugin(NULL, plugins), p)){
383
if(not add_argument(getplugin(NULL), p)){
344
384
perror("add_argument");
345
385
return ARGP_ERR_UNKNOWN;
346
386
}
347
387
}
348
388
}
349
389
break;
350
case 'e':
390
case 'G': /* --global-env */
351
391
if(arg == NULL){
352
392
break;
353
393
}
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
}
394
if(not add_environment(getplugin(NULL), arg, true)){
395
perror("add_environment");
362
396
}
363
397
break;
364
case 'o':
398
case 'o': /* --options-for */
365
399
if (arg != NULL){
366
400
char *p_name = strsep(&arg, ":");
367
if(p_name[0] == '\0'){
401
if(p_name[0] == '\0' or arg == NULL){
368
402
break;
369
403
}
370
404
char *opt = strsep(&arg, ":");
371
if(opt[0] == '\0'){
405
if(opt[0] == '\0' or opt == NULL){
372
406
break;
373
407
}
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
}
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;
384
416
}
385
417
}
386
418
}
387
419
break;
388
case 'f':
420
case 'E': /* --env-for */
389
421
if(arg == NULL){
390
422
break;
391
423
}
394
426
if(envdef == NULL){
395
427
break;
396
428
}
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)){
429
*envdef = '\0';
430
if(not add_environment(getplugin(arg), envdef+1, true)){
403
431
perror("add_environment");
404
432
}
405
433
}
406
434
break;
407
case 'd':
435
case 'd': /* --disable */
408
436
if (arg != NULL){
409
plugin *p = getplugin(arg, plugins);
437
plugin *p = getplugin(arg);
410
438
if(p == NULL){
411
439
return ARGP_ERR_UNKNOWN;
412
440
}
413
441
p->disabled = true;
414
442
}
415
443
break;
416
case 128:
417
plugindir = arg;
418
break;
419
case 129:
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 */
420
464
uid = (uid_t)strtol(arg, NULL, 10);
421
465
break;
422
case 130:
466
case 131: /* --groupid */
423
467
gid = (gid_t)strtol(arg, NULL, 10);
424
468
break;
425
case 131:
469
case 132: /* --debug */
426
470
debug = true;
427
471
break;
428
472
case ARGP_KEY_ARG:
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]",
473
/* Cryptsetup always passes an argument, which is an empty
474
string if "none" was specified in /etc/crypttab. So if
475
argument was empty, we ignore it silently. */
476
if(arg[0] != '\0'){
477
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
478
}
479
break;
480
case ARGP_KEY_END:
481
break;
482
default:
483
return ARGP_ERR_UNKNOWN;
484
}
485
return 0;
486
}
487
488
/* This option parser is the same as parse_opt() above, except it
489
ignores everything but the --config-file option. */
490
error_t parse_opt_config_file (int key, char *arg,
491
__attribute__((unused))
492
struct argp_state *state) {
493
switch (key) {
494
case 'g': /* --global-options */
495
case 'G': /* --global-env */
496
case 'o': /* --options-for */
497
case 'E': /* --env-for */
498
case 'd': /* --disable */
499
case 'e': /* --enable */
500
case 128: /* --plugin-dir */
501
break;
502
case 129: /* --config-file */
503
free(argfile);
504
argfile = strdup(arg);
505
if(argfile == NULL){
506
perror("strdup");
507
}
508
break;
509
case 130: /* --userid */
510
case 131: /* --groupid */
511
case 132: /* --debug */
512
case ARGP_KEY_ARG:
513
case ARGP_KEY_END:
514
break;
515
default:
516
return ARGP_ERR_UNKNOWN;
517
}
518
return 0;
519
}
520
521
struct argp argp = { .options = options,
522
.parser = parse_opt_config_file,
523
.args_doc = "",
443
524
.doc = "Mandos plugin runner -- Run plugins" };
444
525
445
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
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);
446
529
if (ret == ARGP_ERR_UNKNOWN){
447
530
fprintf(stderr, "Unknown error while parsing arguments\n");
448
531
exitstatus = EXIT_FAILURE;
449
532
goto fallback;
450
533
}
451
452
conffp = fopen(argfile, "r");
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
}
453
544
if(conffp != NULL){
454
545
char *org_line = NULL;
455
546
char *p, *arg, *new_arg, *line;
467
558
}
468
559
custom_argv[0] = argv[0];
469
560
custom_argv[1] = NULL;
470
561
562
/* for each line in the config file, strip whitespace and ignore
563
commented text */
471
564
while(true){
472
565
sret = getline(&org_line, &size, conffp);
473
566
if(sret == -1){
481
574
continue;
482
575
}
483
576
new_arg = strdup(p);
484
577
if(new_arg == NULL){
578
perror("strdup");
579
exitstatus = EXIT_FAILURE;
580
free(org_line);
581
goto fallback;
582
}
583
485
584
custom_argc += 1;
486
585
custom_argv = realloc(custom_argv, sizeof(char *)
487
586
* ((unsigned int) custom_argc + 1));
496
595
}
497
596
}
498
597
free(org_line);
499
} else{
598
} else {
500
599
/* Check for harmful errors and go to fallback. Other errors might
501
600
not affect opening plugins */
502
601
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
505
604
goto fallback;
506
605
}
507
606
}
508
607
/* If there was any arguments from configuration file,
608
pass them to parser as command arguments */
509
609
if(custom_argv != NULL){
510
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
610
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
611
0, NULL);
511
612
if (ret == ARGP_ERR_UNKNOWN){
512
613
fprintf(stderr, "Unknown error while parsing arguments\n");
513
614
exitstatus = EXIT_FAILURE;
515
616
}
516
617
}
517
618
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
518
628
if(debug){
519
629
for(plugin *p = plugin_list; p != NULL; p=p->next){
520
630
fprintf(stderr, "Plugin: %s has %d arguments\n",
529
639
}
530
640
}
531
641
642
/* Strip permissions down to nobody */
532
643
ret = setuid(uid);
533
644
if (ret == -1){
534
645
perror("setuid");
535
}
536
646
}
537
647
setgid(gid);
538
648
if (ret == -1){
539
649
perror("setgid");
540
650
}
541
651
542
dir = opendir(plugindir);
652
if (plugindir == NULL){
653
dir = opendir(PDIR);
654
} else {
655
dir = opendir(plugindir);
656
}
657
543
658
if(dir == NULL){
544
659
perror("Could not open plugin dir");
545
660
exitstatus = EXIT_FAILURE;
561
676
562
677
FD_ZERO(&rfds_all);
563
678
679
/* Read and execute any executable in the plugin directory*/
564
680
while(true){
565
681
dirst = readdir(dir);
566
682
567
// All directory entries have been processed
683
/* All directory entries have been processed */
568
684
if(dirst == NULL){
569
685
if (errno == EBADF){
570
686
perror("readdir");
576
692
577
693
d_name_len = strlen(dirst->d_name);
578
694
579
// Ignore dotfiles, backup files and other junk
695
/* Ignore dotfiles, backup files and other junk */
580
696
{
581
697
bool bad_name = false;
582
698
584
700
585
701
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
586
702
".dpkg-old",
703
".dpkg-bak",
587
704
".dpkg-divert", NULL };
588
705
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
589
706
size_t pre_len = strlen(*pre);
597
714
break;
598
715
}
599
716
}
600
601
717
if(bad_name){
602
718
continue;
603
719
}
604
605
720
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
606
721
size_t suf_len = strlen(*suf);
607
722
if((d_name_len >= suf_len)
622
737
}
623
738
624
739
char *filename;
625
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
740
if(plugindir == NULL){
741
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
742
} else {
743
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
744
}
626
745
if(ret < 0){
627
746
perror("asprintf");
628
747
continue;
634
753
free(filename);
635
754
continue;
636
755
}
637
756
757
/* Ignore non-executable files */
638
758
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
639
759
if(debug){
640
760
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
643
763
free(filename);
644
764
continue;
645
765
}
646
plugin *p = getplugin(dirst->d_name, &plugin_list);
766
767
plugin *p = getplugin(dirst->d_name);
647
768
if(p == NULL){
648
769
perror("getplugin");
649
770
free(filename);
659
780
}
660
781
{
661
782
/* Add global arguments to argument list for this plugin */
662
plugin *g = getplugin(NULL, &plugin_list);
783
plugin *g = getplugin(NULL);
663
784
if(g != NULL){
664
785
for(char **a = g->argv + 1; *a != NULL; a++){
665
786
if(not add_argument(p, *a)){
668
789
}
669
790
/* Add global environment variables */
670
791
for(char **e = g->environ; *e != NULL; e++){
671
if(not add_environment(p, *e)){
792
if(not add_environment(p, *e, false)){
672
793
perror("add_environment");
673
794
}
674
795
}
679
800
process, too. */
680
801
if(p->environ[0] != NULL){
681
802
for(char **e = environ; *e != NULL; e++){
682
char *copy = strdup(*e);
683
if(copy == NULL){
684
perror("strdup");
685
continue;
686
}
687
if(not add_environment(p, copy)){
803
if(not add_environment(p, *e, false)){
688
804
perror("add_environment");
689
805
}
690
806
}
697
813
exitstatus = EXIT_FAILURE;
698
814
goto fallback;
699
815
}
816
/* Ask OS to automatic close the pipe on exec */
700
817
ret = set_cloexec_flag(pipefd[0]);
701
818
if(ret < 0){
702
819
perror("set_cloexec_flag");
716
833
exitstatus = EXIT_FAILURE;
717
834
goto fallback;
718
835
}
719
// Starting a new process to be watched
836
/* Starting a new process to be watched */
720
837
pid_t pid = fork();
721
838
if(pid == -1){
722
839
perror("fork");
730
847
perror("sigaction");
731
848
_exit(EXIT_FAILURE);
732
849
}
733
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
850
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
734
851
if(ret < 0){
735
852
perror("sigprocmask");
736
853
_exit(EXIT_FAILURE);
737
854
}
738
855
739
856
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
740
857
if(ret == -1){
741
858
perror("dup2");
760
877
}
761
878
/* no return */
762
879
}
763
/* parent process */
880
/* Parent process */
881
close(pipefd[1]); /* Close unused write end of pipe */
764
882
free(filename);
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");
883
plugin *new_plugin = getplugin(dirst->d_name);
884
if (new_plugin == NULL){
885
perror("getplugin");
769
886
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
770
887
if(ret < 0){
771
perror("sigprocmask");
888
perror("sigprocmask");
772
889
}
773
890
exitstatus = EXIT_FAILURE;
774
891
goto fallback;
775
892
}
776
893
777
*new_process = (struct process){ .pid = pid,
778
.fd = pipefd[0],
779
.next = process_list };
780
// List handling
781
process_list = new_process;
894
new_plugin->pid = pid;
895
new_plugin->fd = pipefd[0];
896
782
897
/* Unblock SIGCHLD so signal handler can be run if this process
783
898
has already completed */
784
899
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
788
903
goto fallback;
789
904
}
790
905
791
FD_SET(new_process->fd, &rfds_all);
906
FD_SET(new_plugin->fd, &rfds_all);
792
907
793
if (maxfd < new_process->fd){
794
maxfd = new_process->fd;
908
if (maxfd < new_plugin->fd){
909
maxfd = new_plugin->fd;
795
910
}
796
797
911
}
798
912
799
free_plugin_list(plugin_list);
800
plugin_list = NULL;
801
802
913
closedir(dir);
803
914
dir = NULL;
804
805
if (process_list == NULL){
806
fprintf(stderr, "No plugin processes started. Incorrect plugin"
807
" directory?\n");
808
process_list = 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
}
809
925
}
810
while(process_list){
926
927
/* Main loop while running plugins exist */
928
while(plugin_list){
811
929
fd_set rfds = rfds_all;
812
930
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
813
931
if (select_ret == -1){
817
935
}
818
936
/* OK, now either a process completed, or something can be read
819
937
from one of them */
820
for(process *proc = process_list; proc ; proc = proc->next){
938
for(plugin *proc = plugin_list; proc != NULL;){
821
939
/* Is this process completely done? */
822
940
if(proc->eof and proc->completed){
823
941
/* Only accept the plugin output if it exited cleanly */
824
942
if(not WIFEXITED(proc->status)
825
943
or WEXITSTATUS(proc->status) != 0){
826
944
/* Bad exit by plugin */
945
827
946
if(debug){
828
947
if(WIFEXITED(proc->status)){
829
948
fprintf(stderr, "Plugin %u exited with status %d\n",
838
957
(unsigned int) (proc->pid));
839
958
}
840
959
}
960
841
961
/* Remove the plugin */
842
962
FD_CLR(proc->fd, &rfds_all);
963
843
964
/* Block signal while modifying process_list */
844
965
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
845
966
if(ret < 0){
847
968
exitstatus = EXIT_FAILURE;
848
969
goto fallback;
849
970
}
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
}
971
972
plugin *next_plugin = proc->next;
973
free_plugin(proc);
974
proc = next_plugin;
975
863
976
/* We are done modifying process list, so unblock signal */
864
977
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
865
978
NULL);
866
979
if(ret < 0){
867
980
perror("sigprocmask");
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;
981
exitstatus = EXIT_FAILURE;
982
goto fallback;
983
}
984
985
if(plugin_list == NULL){
986
break;
987
}
988
989
continue;
875
990
}
991
876
992
/* This process exited nicely, so print its buffer */
877
993
878
994
bool bret = print_out_password(proc->buffer,
879
995
proc->buffer_length);
880
996
if(not bret){
883
999
}
884
1000
goto fallback;
885
1001
}
1002
886
1003
/* This process has not completed. Does it have any output? */
887
1004
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
888
1005
/* This process had nothing to say at this time */
1006
proc = proc->next;
889
1007
continue;
890
1008
}
891
1009
/* Before reading, make the process' data buffer large enough */
904
1022
BUFFER_SIZE);
905
1023
if(ret < 0){
906
1024
/* Read error from this process; ignore the error */
1025
proc = proc->next;
907
1026
continue;
908
1027
}
909
1028
if(ret == 0){
918
1037
919
1038
fallback:
920
1039
921
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1040
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
922
1041
/* Fallback if all plugins failed, none are found or an error
923
1042
occured */
924
1043
bool bret;
925
1044
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
926
1045
char *passwordbuffer = getpass("Password: ");
927
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1046
size_t len = strlen(passwordbuffer);
1047
/* Strip trailing newline */
1048
if(len > 0 and passwordbuffer[len-1] == '\n'){
1049
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1050
len--;
1051
}
1052
bret = print_out_password(passwordbuffer, len);
928
1053
if(not bret){
929
1054
perror("print_out_password");
930
1055
exitstatus = EXIT_FAILURE;
937
1062
perror("sigaction");
938
1063
exitstatus = EXIT_FAILURE;
939
1064
}
940
1065
941
1066
if(custom_argv != NULL){
942
1067
for(char **arg = custom_argv+1; *arg != NULL; arg++){
943
1068
free(*arg);
944
1069
}
945
1070
free(custom_argv);
946
1071
}
947
free_plugin_list(plugin_list);
948
1072
949
1073
if(dir != NULL){
950
1074
closedir(dir);
951
1075
}
952
1076
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");
1077
/* Kill the processes */
1078
for(plugin *p = plugin_list; p != NULL; p = p->next){
1079
if(p->pid != 0){
1080
close(p->fd);
1081
ret = kill(p->pid, SIGTERM);
1082
if(ret == -1 and errno != ESRCH){
1083
/* Set-uid proccesses might not get closed */
1084
perror("kill");
1085
}
961
1086
}
962
free(process_list->buffer);
963
free(process_list);
964
1087
}
965
1088
966
1089
/* Wait for any remaining child processes to terminate */
971
1094
perror("wait");
972
1095
}
973
1096
1097
free_plugin_list();
1098
1099
free(plugindir);
1100
free(argfile);
1101
974
1102
return exitstatus;
975
1103
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0