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- Committer: Teddy Hogeborn
- Date: 2008-11-08 17:26:35 UTC
- Revision ID: teddy@fukt.bsnet.se-20081108172635-6eexzbysvsk4bu1z
* mandos: Also import "with_statement" and "absolute_import" from
"__future__. Import "closing" from "contextlib".
(Client.__init__): Use "with closing" on "secfile".
(Client.checker_callback): Call "self.bump_timeout()" instead of
doing it directly.
(Client.bump_timeout): New method to bump up the timeout.
(TCP_handler.handle): Simplify code to provide fallback default for
GnuTLS priority string.
(IPv6_TCPServer): Do not inherit from
"SocketServer.ForkingTCPServer", since that is
undocumented - instead, follow the example code
from the documentation.
(if_nametoindex): Use "with closing" on the socket.
"__future__. Import "closing" from "contextlib".
(Client.__init__): Use "with closing" on "secfile".
(Client.checker_callback): Call "self.bump_timeout()" instead of
doing it directly.
(Client.bump_timeout): New method to bump up the timeout.
(TCP_handler.handle): Simplify code to provide fallback default for
GnuTLS priority string.
(IPv6_TCPServer): Do not inherit from
"SocketServer.ForkingTCPServer", since that is
undocumented - instead, follow the example code
from the documentation.
(if_nametoindex): Use "with closing" on the socket.
- 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:
- .bzrignore
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,
69
69
#define PDIR "/lib/mandos/plugins.d"
70
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
71
72
const char *argp_program_version = "plugin-runner 1.0";
72
const char *argp_program_version = "plugin-runner " VERSION;
73
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
74
75
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;
76
82
77
typedef struct process{
83
/* Variables used for running processes*/
78
84
pid_t pid;
79
85
int fd;
80
86
char *buffer;
83
89
bool eof;
84
90
volatile bool completed;
85
91
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
92
struct plugin *next;
97
93
} plugin;
98
94
99
static plugin *getplugin(char *name, plugin **plugin_list){
100
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){
101
102
if ((p->name == name)
102
103
or (p->name and name and (strcmp(p->name, name) == 0))){
103
104
return p;
118
119
119
120
*new_plugin = (plugin) { .name = copy_name,
120
121
.argc = 1,
121
.envc = 0,
122
122
.disabled = false,
123
.next = *plugin_list };
123
.next = plugin_list };
124
124
125
125
new_plugin->argv = malloc(sizeof(char *) * 2);
126
126
if (new_plugin->argv == NULL){
130
130
}
131
131
new_plugin->argv[0] = copy_name;
132
132
new_plugin->argv[1] = NULL;
133
133
134
134
new_plugin->environ = malloc(sizeof(char *));
135
135
if(new_plugin->environ == NULL){
136
136
free(copy_name);
139
139
return NULL;
140
140
}
141
141
new_plugin->environ[0] = NULL;
142
142
143
/* Append the new plugin to the list */
143
*plugin_list = new_plugin;
144
plugin_list = new_plugin;
144
145
return new_plugin;
145
146
}
146
147
176
177
}
177
178
178
179
/* Add to a plugin's environment */
179
static bool add_environment(plugin *p, const char *def){
180
static bool add_environment(plugin *p, const char *def, bool replace){
180
181
if(p == NULL){
181
182
return false;
182
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
}
183
201
return add_to_char_array(def, &(p->environ), &(p->envc));
184
202
}
185
203
186
187
204
/*
188
205
* Based on the example in the GNU LibC manual chapter 13.13 "File
189
206
* Descriptor Flags".
190
207
* *Note File Descriptor Flags:(libc)Descriptor Flags.
191
208
*/
192
static int set_cloexec_flag(int fd)
193
{
209
static int set_cloexec_flag(int fd){
194
210
int ret = fcntl(fd, F_GETFD, 0);
195
211
/* If reading the flags failed, return error indication now. */
196
212
if(ret < 0){
200
216
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
201
217
}
202
218
203
process *process_list = NULL;
204
219
205
220
/* Mark processes as completed when they exit, and save their exit
206
221
status. */
207
void handle_sigchld(__attribute__((unused)) int sig){
222
static void handle_sigchld(__attribute__((unused)) int sig){
208
223
while(true){
209
process *proc = process_list;
224
plugin *proc = plugin_list;
210
225
int status;
211
226
pid_t pid = waitpid(-1, &status, WNOHANG);
212
227
if(pid == 0){
220
235
/* No child processes */
221
236
break;
222
237
}
223
238
224
239
/* A child exited, find it in process_list */
225
240
while(proc != NULL and proc->pid != pid){
226
241
proc = proc->next;
234
249
}
235
250
}
236
251
237
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){
238
254
ssize_t ret;
239
if(length>0 and buffer[length-1] == '\n'){
240
length--;
241
}
242
255
for(size_t written = 0; written < length; written += (size_t)ret){
243
256
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
244
257
length - written));
249
262
return true;
250
263
}
251
264
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);
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);
264
298
}
265
299
}
266
300
304
338
{ .name = "global-options", .key = 'g',
305
339
.arg = "OPTION[,OPTION[,...]]",
306
340
.doc = "Options passed to all plugins" },
307
{ .name = "global-envs", .key = 'e',
341
{ .name = "global-env", .key = 'G',
308
342
.arg = "VAR=value",
309
343
.doc = "Environment variable passed to all plugins" },
310
344
{ .name = "options-for", .key = 'o',
311
345
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
312
346
.doc = "Options passed only to specified plugin" },
313
{ .name = "envs-for", .key = 'f',
347
{ .name = "env-for", .key = 'E',
314
348
.arg = "PLUGIN:ENV=value",
315
349
.doc = "Environment variable passed to specified plugin" },
316
350
{ .name = "disable", .key = 'd',
317
351
.arg = "PLUGIN",
318
352
.doc = "Disable a specific plugin", .group = 1 },
353
{ .name = "enable", .key = 'e',
354
.arg = "PLUGIN",
355
.doc = "Enable a specific plugin", .group = 1 },
319
356
{ .name = "plugin-dir", .key = 128,
320
357
.arg = "DIRECTORY",
321
358
.doc = "Specify a different plugin directory", .group = 2 },
333
370
{ .name = NULL }
334
371
};
335
372
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;
373
error_t parse_opt (int key, char *arg, __attribute__((unused))
374
struct argp_state *state) {
340
375
switch (key) {
341
case 'g':
376
case 'g': /* --global-options */
342
377
if (arg != NULL){
343
378
char *p;
344
379
while((p = strsep(&arg, ",")) != NULL){
345
380
if(p[0] == '\0'){
346
381
continue;
347
382
}
348
if(not add_argument(getplugin(NULL, plugins), p)){
383
if(not add_argument(getplugin(NULL), p)){
349
384
perror("add_argument");
350
385
return ARGP_ERR_UNKNOWN;
351
386
}
352
387
}
353
388
}
354
389
break;
355
case 'e':
390
case 'G': /* --global-env */
356
391
if(arg == NULL){
357
392
break;
358
393
}
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
}
394
if(not add_environment(getplugin(NULL), arg, true)){
395
perror("add_environment");
367
396
}
368
397
break;
369
case 'o':
398
case 'o': /* --options-for */
370
399
if (arg != NULL){
371
400
char *p_name = strsep(&arg, ":");
372
if(p_name[0] == '\0'){
401
if(p_name[0] == '\0' or arg == NULL){
373
402
break;
374
403
}
375
404
char *opt = strsep(&arg, ":");
376
if(opt[0] == '\0'){
405
if(opt[0] == '\0' or opt == NULL){
377
406
break;
378
407
}
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
}
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;
389
416
}
390
417
}
391
418
}
392
419
break;
393
case 'f':
420
case 'E': /* --env-for */
394
421
if(arg == NULL){
395
422
break;
396
423
}
399
426
if(envdef == NULL){
400
427
break;
401
428
}
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)){
429
*envdef = '\0';
430
if(not add_environment(getplugin(arg), envdef+1, true)){
408
431
perror("add_environment");
409
432
}
410
433
}
411
434
break;
412
case 'd':
435
case 'd': /* --disable */
413
436
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
437
plugin *p = getplugin(arg);
415
438
if(p == NULL){
416
439
return ARGP_ERR_UNKNOWN;
417
440
}
418
441
p->disabled = true;
419
442
}
420
443
break;
421
case 128:
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);
422
455
plugindir = strdup(arg);
423
456
if(plugindir == NULL){
424
457
perror("strdup");
425
458
}
426
459
break;
427
case 129:
460
case 129: /* --config-file */
461
/* This is already done by parse_opt_config_file() */
462
break;
463
case 130: /* --userid */
464
uid = (uid_t)strtol(arg, NULL, 10);
465
break;
466
case 131: /* --groupid */
467
gid = (gid_t)strtol(arg, NULL, 10);
468
break;
469
case 132: /* --debug */
470
debug = true;
471
break;
472
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);
428
504
argfile = strdup(arg);
429
505
if(argfile == NULL){
430
506
perror("strdup");
431
507
}
432
508
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;
509
case 130: /* --userid */
510
case 131: /* --groupid */
511
case 132: /* --debug */
442
512
case ARGP_KEY_ARG:
443
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
444
break;
445
513
case ARGP_KEY_END:
446
514
break;
447
515
default:
450
518
return 0;
451
519
}
452
520
453
plugin *plugin_list = NULL;
454
455
struct argp argp = { .options = options, .parser = parse_opt,
456
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
521
struct argp argp = { .options = options,
522
.parser = parse_opt_config_file,
523
.args_doc = "",
457
524
.doc = "Mandos plugin runner -- Run plugins" };
458
525
459
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);
460
529
if (ret == ARGP_ERR_UNKNOWN){
461
530
fprintf(stderr, "Unknown error while parsing arguments\n");
462
531
exitstatus = EXIT_FAILURE;
463
532
goto fallback;
464
533
}
465
534
535
/* Reset to the normal argument parser */
536
argp.parser = parse_opt;
537
538
/* Open the configfile if available */
466
539
if (argfile == NULL){
467
540
conffp = fopen(AFILE, "r");
468
541
} else {
469
542
conffp = fopen(argfile, "r");
470
}
471
543
}
472
544
if(conffp != NULL){
473
545
char *org_line = NULL;
474
546
char *p, *arg, *new_arg, *line;
486
558
}
487
559
custom_argv[0] = argv[0];
488
560
custom_argv[1] = NULL;
489
561
562
/* for each line in the config file, strip whitespace and ignore
563
commented text */
490
564
while(true){
491
565
sret = getline(&org_line, &size, conffp);
492
566
if(sret == -1){
521
595
}
522
596
}
523
597
free(org_line);
524
} else{
598
} else {
525
599
/* Check for harmful errors and go to fallback. Other errors might
526
600
not affect opening plugins */
527
601
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
530
604
goto fallback;
531
605
}
532
606
}
533
607
/* If there was any arguments from configuration file,
608
pass them to parser as command arguments */
534
609
if(custom_argv != NULL){
535
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);
536
612
if (ret == ARGP_ERR_UNKNOWN){
537
613
fprintf(stderr, "Unknown error while parsing arguments\n");
538
614
exitstatus = EXIT_FAILURE;
540
616
}
541
617
}
542
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
543
628
if(debug){
544
629
for(plugin *p = plugin_list; p != NULL; p=p->next){
545
630
fprintf(stderr, "Plugin: %s has %d arguments\n",
554
639
}
555
640
}
556
641
642
/* Strip permissions down to nobody */
557
643
ret = setuid(uid);
558
644
if (ret == -1){
559
645
perror("setuid");
560
}
561
646
}
562
647
setgid(gid);
563
648
if (ret == -1){
564
649
perror("setgid");
565
650
}
566
651
567
652
if (plugindir == NULL){
568
653
dir = opendir(PDIR);
569
654
} else {
591
676
592
677
FD_ZERO(&rfds_all);
593
678
679
/* Read and execute any executable in the plugin directory*/
594
680
while(true){
595
681
dirst = readdir(dir);
596
682
597
// All directory entries have been processed
683
/* All directory entries have been processed */
598
684
if(dirst == NULL){
599
685
if (errno == EBADF){
600
686
perror("readdir");
606
692
607
693
d_name_len = strlen(dirst->d_name);
608
694
609
// Ignore dotfiles, backup files and other junk
695
/* Ignore dotfiles, backup files and other junk */
610
696
{
611
697
bool bad_name = false;
612
698
614
700
615
701
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
616
702
".dpkg-old",
703
".dpkg-bak",
617
704
".dpkg-divert", NULL };
618
705
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
619
706
size_t pre_len = strlen(*pre);
627
714
break;
628
715
}
629
716
}
630
631
717
if(bad_name){
632
718
continue;
633
719
}
634
635
720
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
636
721
size_t suf_len = strlen(*suf);
637
722
if((d_name_len >= suf_len)
652
737
}
653
738
654
739
char *filename;
655
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
}
656
745
if(ret < 0){
657
746
perror("asprintf");
658
747
continue;
664
753
free(filename);
665
754
continue;
666
755
}
667
756
757
/* Ignore non-executable files */
668
758
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
669
759
if(debug){
670
760
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
673
763
free(filename);
674
764
continue;
675
765
}
676
plugin *p = getplugin(dirst->d_name, &plugin_list);
766
767
plugin *p = getplugin(dirst->d_name);
677
768
if(p == NULL){
678
769
perror("getplugin");
679
770
free(filename);
689
780
}
690
781
{
691
782
/* Add global arguments to argument list for this plugin */
692
plugin *g = getplugin(NULL, &plugin_list);
783
plugin *g = getplugin(NULL);
693
784
if(g != NULL){
694
785
for(char **a = g->argv + 1; *a != NULL; a++){
695
786
if(not add_argument(p, *a)){
698
789
}
699
790
/* Add global environment variables */
700
791
for(char **e = g->environ; *e != NULL; e++){
701
if(not add_environment(p, *e)){
792
if(not add_environment(p, *e, false)){
702
793
perror("add_environment");
703
794
}
704
795
}
709
800
process, too. */
710
801
if(p->environ[0] != NULL){
711
802
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)){
803
if(not add_environment(p, *e, false)){
718
804
perror("add_environment");
719
805
}
720
806
}
727
813
exitstatus = EXIT_FAILURE;
728
814
goto fallback;
729
815
}
816
/* Ask OS to automatic close the pipe on exec */
730
817
ret = set_cloexec_flag(pipefd[0]);
731
818
if(ret < 0){
732
819
perror("set_cloexec_flag");
746
833
exitstatus = EXIT_FAILURE;
747
834
goto fallback;
748
835
}
749
// Starting a new process to be watched
836
/* Starting a new process to be watched */
750
837
pid_t pid = fork();
751
838
if(pid == -1){
752
839
perror("fork");
760
847
perror("sigaction");
761
848
_exit(EXIT_FAILURE);
762
849
}
763
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
850
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
764
851
if(ret < 0){
765
852
perror("sigprocmask");
766
853
_exit(EXIT_FAILURE);
767
854
}
768
855
769
856
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
770
857
if(ret == -1){
771
858
perror("dup2");
790
877
}
791
878
/* no return */
792
879
}
793
/* parent process */
880
/* Parent process */
881
close(pipefd[1]); /* Close unused write end of pipe */
794
882
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");
883
plugin *new_plugin = getplugin(dirst->d_name);
884
if (new_plugin == NULL){
885
perror("getplugin");
799
886
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
800
887
if(ret < 0){
801
perror("sigprocmask");
888
perror("sigprocmask");
802
889
}
803
890
exitstatus = EXIT_FAILURE;
804
891
goto fallback;
805
892
}
806
893
807
*new_process = (struct process){ .pid = pid,
808
.fd = pipefd[0],
809
.next = process_list };
810
// List handling
811
process_list = new_process;
894
new_plugin->pid = pid;
895
new_plugin->fd = pipefd[0];
896
812
897
/* Unblock SIGCHLD so signal handler can be run if this process
813
898
has already completed */
814
899
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
818
903
goto fallback;
819
904
}
820
905
821
FD_SET(new_process->fd, &rfds_all);
906
FD_SET(new_plugin->fd, &rfds_all);
822
907
823
if (maxfd < new_process->fd){
824
maxfd = new_process->fd;
908
if (maxfd < new_plugin->fd){
909
maxfd = new_plugin->fd;
825
910
}
826
827
911
}
828
829
free_plugin_list(plugin_list);
830
plugin_list = NULL;
831
912
832
913
closedir(dir);
833
914
dir = NULL;
834
835
if (process_list == NULL){
836
fprintf(stderr, "No plugin processes started. Incorrect plugin"
837
" directory?\n");
838
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
}
839
925
}
840
while(process_list){
926
927
/* Main loop while running plugins exist */
928
while(plugin_list){
841
929
fd_set rfds = rfds_all;
842
930
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
843
931
if (select_ret == -1){
847
935
}
848
936
/* OK, now either a process completed, or something can be read
849
937
from one of them */
850
for(process *proc = process_list; proc ; proc = proc->next){
938
for(plugin *proc = plugin_list; proc != NULL;){
851
939
/* Is this process completely done? */
852
940
if(proc->eof and proc->completed){
853
941
/* Only accept the plugin output if it exited cleanly */
854
942
if(not WIFEXITED(proc->status)
855
943
or WEXITSTATUS(proc->status) != 0){
856
944
/* Bad exit by plugin */
945
857
946
if(debug){
858
947
if(WIFEXITED(proc->status)){
859
948
fprintf(stderr, "Plugin %u exited with status %d\n",
868
957
(unsigned int) (proc->pid));
869
958
}
870
959
}
960
871
961
/* Remove the plugin */
872
962
FD_CLR(proc->fd, &rfds_all);
963
873
964
/* Block signal while modifying process_list */
874
965
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
875
966
if(ret < 0){
877
968
exitstatus = EXIT_FAILURE;
878
969
goto fallback;
879
970
}
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
}
971
972
plugin *next_plugin = proc->next;
973
free_plugin(proc);
974
proc = next_plugin;
975
893
976
/* We are done modifying process list, so unblock signal */
894
977
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
895
978
NULL);
896
979
if(ret < 0){
897
980
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;
981
exitstatus = EXIT_FAILURE;
982
goto fallback;
983
}
984
985
if(plugin_list == NULL){
986
break;
987
}
988
989
continue;
905
990
}
991
906
992
/* This process exited nicely, so print its buffer */
907
993
908
994
bool bret = print_out_password(proc->buffer,
909
995
proc->buffer_length);
910
996
if(not bret){
913
999
}
914
1000
goto fallback;
915
1001
}
1002
916
1003
/* This process has not completed. Does it have any output? */
917
1004
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
918
1005
/* This process had nothing to say at this time */
1006
proc = proc->next;
919
1007
continue;
920
1008
}
921
1009
/* Before reading, make the process' data buffer large enough */
934
1022
BUFFER_SIZE);
935
1023
if(ret < 0){
936
1024
/* Read error from this process; ignore the error */
1025
proc = proc->next;
937
1026
continue;
938
1027
}
939
1028
if(ret == 0){
948
1037
949
1038
fallback:
950
1039
951
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1040
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
952
1041
/* Fallback if all plugins failed, none are found or an error
953
1042
occured */
954
1043
bool bret;
955
1044
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
956
1045
char *passwordbuffer = getpass("Password: ");
957
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);
958
1053
if(not bret){
959
1054
perror("print_out_password");
960
1055
exitstatus = EXIT_FAILURE;
967
1062
perror("sigaction");
968
1063
exitstatus = EXIT_FAILURE;
969
1064
}
970
1065
971
1066
if(custom_argv != NULL){
972
1067
for(char **arg = custom_argv+1; *arg != NULL; arg++){
973
1068
free(*arg);
974
1069
}
975
1070
free(custom_argv);
976
1071
}
977
free_plugin_list(plugin_list);
978
1072
979
1073
if(dir != NULL){
980
1074
closedir(dir);
981
1075
}
982
1076
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");
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
}
991
1086
}
992
free(process_list->buffer);
993
free(process_list);
994
1087
}
995
1088
996
1089
/* Wait for any remaining child processes to terminate */
1000
1093
if(errno != ECHILD){
1001
1094
perror("wait");
1002
1095
}
1003
1096
1097
free_plugin_list();
1098
1004
1099
free(plugindir);
1005
1100
free(argfile);
1006
1101
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0