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- Committer: Teddy Hogeborn
- Date: 2008-09-04 12:38:35 UTC
- Revision ID: teddy@fukt.bsnet.se-20080904123835-hervuvv4pmpxl8r1
* README: Improved wording.
* initramfs-tools-hook: Do not copy auto-save files from
"/etc/mandos/plugins.d". Do not create key
ring files. Do not reset permissions on
things like "$DESTDIR/lib/mandos/plugins.d",
which should not be publicly accessible.
* plugin-runner.xml (DESCRIPTION, PLUGINS): Improved grammar.
* initramfs-tools-hook: Do not copy auto-save files from
"/etc/mandos/plugins.d". Do not create key
ring files. Do not reset permissions on
things like "$DESTDIR/lib/mandos/plugins.d",
which should not be publicly accessible.
* plugin-runner.xml (DESCRIPTION, PLUGINS): Improved grammar.
- files added:
- .bzrignore
- files removed:
- network-protocol.txt
- files modified:
- Makefile
added
removed
plugin-runner.c
56
56
#include <argp.h> /* struct argp_option, struct
57
57
argp_state, struct argp,
58
58
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
error_t */
60
61
#include <signal.h> /* struct sigaction, sigemptyset(),
61
62
sigaddset(), sigaction(),
62
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
65
#include <errno.h> /* errno, EBADF */
65
66
66
67
#define BUFFER_SIZE 256
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
69
#define PDIR "/lib/mandos/plugins.d"
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
71
69
72
const char *argp_program_version = "plugin-runner 1.0";
70
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
74
72
struct process;
73
74
typedef struct process{
75
pid_t pid;
76
int fd;
77
char *buffer;
78
size_t buffer_size;
79
size_t buffer_length;
80
bool eof;
81
bool completed;
82
int status;
83
struct process *next;
84
} process;
75
struct plugin;
85
76
86
77
typedef struct plugin{
87
78
char *name; /* can be NULL or any plugin name */
90
81
char **environ;
91
82
int envc;
92
83
bool disabled;
84
85
/* Variables used for running processes*/
86
pid_t pid;
87
int fd;
88
char *buffer;
89
size_t buffer_size;
90
size_t buffer_length;
91
bool eof;
92
volatile bool completed;
93
volatile int status;
93
94
struct plugin *next;
94
95
} plugin;
95
96
96
static plugin *getplugin(char *name, plugin **plugin_list){
97
for (plugin *p = *plugin_list; p != NULL; p = p->next){
97
static plugin *plugin_list = NULL;
98
99
/* Gets a existing plugin based on name,
100
or if none is found, creates a new one */
101
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
103
for (plugin *p = plugin_list; p != NULL; p = p->next){
98
104
if ((p->name == name)
99
105
or (p->name and name and (strcmp(p->name, name) == 0))){
100
106
return p;
105
111
if (new_plugin == NULL){
106
112
return NULL;
107
113
}
108
char *copy_name = strdup(name);
109
if(copy_name == NULL){
110
return NULL;
114
char *copy_name = NULL;
115
if(name != NULL){
116
copy_name = strdup(name);
117
if(copy_name == NULL){
118
return NULL;
119
}
111
120
}
112
121
113
122
*new_plugin = (plugin) { .name = copy_name,
114
123
.argc = 1,
115
.envc = 0,
116
124
.disabled = false,
117
.next = *plugin_list };
125
.next = plugin_list };
118
126
119
127
new_plugin->argv = malloc(sizeof(char *) * 2);
120
128
if (new_plugin->argv == NULL){
129
free(copy_name);
121
130
free(new_plugin);
122
131
return NULL;
123
132
}
124
133
new_plugin->argv[0] = copy_name;
125
134
new_plugin->argv[1] = NULL;
126
135
127
136
new_plugin->environ = malloc(sizeof(char *));
128
137
if(new_plugin->environ == NULL){
138
free(copy_name);
129
139
free(new_plugin->argv);
130
140
free(new_plugin);
131
141
return NULL;
132
142
}
133
143
new_plugin->environ[0] = NULL;
144
134
145
/* Append the new plugin to the list */
135
*plugin_list = new_plugin;
146
plugin_list = new_plugin;
136
147
return new_plugin;
137
148
}
138
149
168
179
}
169
180
170
181
/* Add to a plugin's environment */
171
static bool add_environment(plugin *p, const char *def){
182
static bool add_environment(plugin *p, const char *def, bool replace){
172
183
if(p == NULL){
173
184
return false;
174
185
}
186
/* namelen = length of name of environment variable */
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen+1) == 0){
191
/* It already exists */
192
if(replace){
193
char *new = realloc(*e, strlen(def));
194
if(new == NULL){
195
return false;
196
}
197
*e = new;
198
strcpy(*e, def);
199
}
200
return true;
201
}
202
}
175
203
return add_to_char_array(def, &(p->environ), &(p->envc));
176
204
}
177
205
178
179
206
/*
180
207
* Based on the example in the GNU LibC manual chapter 13.13 "File
181
208
* Descriptor Flags".
192
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
193
220
}
194
221
195
process *process_list = NULL;
196
222
197
/* Mark a process as completed when it exits, and save its exit
223
/* Mark processes as completed when they exit, and save their exit
198
224
status. */
199
225
void handle_sigchld(__attribute__((unused)) int sig){
200
process *proc = process_list;
201
int status;
202
pid_t pid = wait(&status);
203
if(pid == -1){
204
perror("wait");
205
return;
206
}
207
while(proc != NULL and proc->pid != pid){
208
proc = proc->next;
209
}
210
if(proc == NULL){
211
/* Process not found in process list */
212
return;
213
}
214
proc->status = status;
215
proc->completed = true;
226
while(true){
227
plugin *proc = plugin_list;
228
int status;
229
pid_t pid = waitpid(-1, &status, WNOHANG);
230
if(pid == 0){
231
/* Only still running child processes */
232
break;
233
}
234
if(pid == -1){
235
if (errno != ECHILD){
236
perror("waitpid");
237
}
238
/* No child processes */
239
break;
240
}
241
242
/* A child exited, find it in process_list */
243
while(proc != NULL and proc->pid != pid){
244
proc = proc->next;
245
}
246
if(proc == NULL){
247
/* Process not found in process list */
248
continue;
249
}
250
proc->status = status;
251
proc->completed = true;
252
}
216
253
}
217
254
255
/* Prints out a password to stdout */
218
256
bool print_out_password(const char *buffer, size_t length){
219
257
ssize_t ret;
220
258
if(length>0 and buffer[length-1] == '\n'){
230
268
return true;
231
269
}
232
270
233
char **add_to_argv(char **argv, int *argc, char *arg){
234
if (argv == NULL){
235
*argc = 1;
236
argv = malloc(sizeof(char*) * 2);
237
if(argv == NULL){
238
return NULL;
271
/* Removes and free a plugin from the plugin list */
272
static void free_plugin(plugin *plugin_node){
273
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
275
free(*arg);
276
}
277
free(plugin_node->argv);
278
for(char **env = plugin_node->environ; *env != NULL; env++){
279
free(*env);
280
}
281
free(plugin_node->environ);
282
free(plugin_node->buffer);
283
284
/* Removes the plugin from the singly-linked list */
285
if(plugin_node == plugin_list){
286
/* First one - simple */
287
plugin_list = plugin_list->next;
288
} else {
289
/* Second one or later */
290
for(plugin *p = plugin_list; p != NULL; p = p->next){
291
if(p->next == plugin_node){
292
p->next = plugin_node->next;
293
break;
294
}
239
295
}
240
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
241
argv[1] = NULL;
242
}
243
*argc += 1;
244
argv = realloc(argv, sizeof(char *)
245
* ((unsigned int) *argc + 1));
246
if(argv == NULL){
247
return NULL;
248
}
249
argv[*argc-1] = arg;
250
argv[*argc] = NULL;
251
return argv;
296
}
297
298
free(plugin_node);
252
299
}
253
300
254
static void free_plugin_list(plugin *plugin_list){
255
for(plugin *next = plugin_list; plugin_list != NULL; plugin_list = next){
256
next = plugin_list->next;
257
free(plugin_list->name);
258
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
259
free(*arg);
260
}
261
free(plugin_list->argv);
262
for(char **env = plugin_list->environ; *env != NULL; env++){
263
free(*env);
264
}
265
free(plugin_list->environ);
266
free(plugin_list);
267
}
301
static void free_plugin_list(void){
302
while(plugin_list != NULL){
303
free_plugin(plugin_list);
304
}
268
305
}
269
306
270
307
int main(int argc, char *argv[]){
271
const char *plugindir = "/lib/mandos/plugins.d";
272
const char *argfile = ARGFILE;
308
char *plugindir = NULL;
309
char *argfile = NULL;
273
310
FILE *conffp;
274
311
size_t d_name_len;
275
312
DIR *dir = NULL;
298
335
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
299
336
if(ret == -1){
300
337
perror("sigaction");
301
exitstatus = EXIT_FAILURE;
338
exitstatus = EXIT_FAILURE;
302
339
goto fallback;
303
340
}
304
341
307
344
{ .name = "global-options", .key = 'g',
308
345
.arg = "OPTION[,OPTION[,...]]",
309
346
.doc = "Options passed to all plugins" },
310
{ .name = "global-envs", .key = 'e',
347
{ .name = "global-env", .key = 'G',
311
348
.arg = "VAR=value",
312
349
.doc = "Environment variable passed to all plugins" },
313
350
{ .name = "options-for", .key = 'o',
314
351
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
315
352
.doc = "Options passed only to specified plugin" },
316
{ .name = "envs-for", .key = 'f',
353
{ .name = "env-for", .key = 'E',
317
354
.arg = "PLUGIN:ENV=value",
318
355
.doc = "Environment variable passed to specified plugin" },
319
356
{ .name = "disable", .key = 'd',
320
357
.arg = "PLUGIN",
321
358
.doc = "Disable a specific plugin", .group = 1 },
359
{ .name = "enable", .key = 'e',
360
.arg = "PLUGIN",
361
.doc = "Enable a specific plugin", .group = 1 },
322
362
{ .name = "plugin-dir", .key = 128,
323
363
.arg = "DIRECTORY",
324
364
.doc = "Specify a different plugin directory", .group = 2 },
325
{ .name = "userid", .key = 129,
326
.arg = "ID", .flags = 0,
327
.doc = "User ID the plugins will run as", .group = 2 },
328
{ .name = "groupid", .key = 130,
329
.arg = "ID", .flags = 0,
330
.doc = "Group ID the plugins will run as", .group = 2 },
331
{ .name = "debug", .key = 131,
332
.doc = "Debug mode", .group = 3 },
365
{ .name = "config-file", .key = 129,
366
.arg = "FILE",
367
.doc = "Specify a different configuration file", .group = 2 },
368
{ .name = "userid", .key = 130,
369
.arg = "ID", .flags = 0,
370
.doc = "User ID the plugins will run as", .group = 3 },
371
{ .name = "groupid", .key = 131,
372
.arg = "ID", .flags = 0,
373
.doc = "Group ID the plugins will run as", .group = 3 },
374
{ .name = "debug", .key = 132,
375
.doc = "Debug mode", .group = 4 },
333
376
{ .name = NULL }
334
377
};
335
378
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;
379
error_t parse_opt (int key, char *arg, __attribute__((unused))
380
struct argp_state *state) {
340
381
switch (key) {
341
case 'g':
382
case 'g': /* --global-options */
342
383
if (arg != NULL){
343
384
char *p;
344
385
while((p = strsep(&arg, ",")) != NULL){
345
386
if(p[0] == '\0'){
346
387
continue;
347
388
}
348
if(not add_argument(getplugin(NULL, plugins), p)){
389
if(not add_argument(getplugin(NULL), p)){
349
390
perror("add_argument");
350
391
return ARGP_ERR_UNKNOWN;
351
392
}
352
393
}
353
394
}
354
395
break;
355
case 'e':
396
case 'G': /* --global-env */
356
397
if(arg == NULL){
357
398
break;
358
399
}
361
402
if(envdef == NULL){
362
403
break;
363
404
}
364
if(not add_environment(getplugin(NULL, plugins), envdef)){
405
if(not add_environment(getplugin(NULL), envdef, true)){
365
406
perror("add_environment");
366
407
}
367
408
}
368
409
break;
369
case 'o':
410
case 'o': /* --options-for */
370
411
if (arg != NULL){
371
412
char *p_name = strsep(&arg, ":");
372
413
if(p_name[0] == '\0'){
382
423
if(p[0] == '\0'){
383
424
continue;
384
425
}
385
if(not add_argument(getplugin(p_name, plugins), p)){
426
if(not add_argument(getplugin(p_name), p)){
386
427
perror("add_argument");
387
428
return ARGP_ERR_UNKNOWN;
388
429
}
390
431
}
391
432
}
392
433
break;
393
case 'f':
434
case 'E': /* --env-for */
394
435
if(arg == NULL){
395
436
break;
396
437
}
404
445
break;
405
446
}
406
447
envdef++;
407
if(not add_environment(getplugin(p_name, plugins), envdef)){
448
if(not add_environment(getplugin(p_name), envdef, true)){
408
449
perror("add_environment");
409
450
}
410
451
}
411
452
break;
412
case 'd':
453
case 'd': /* --disable */
413
454
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
455
plugin *p = getplugin(arg);
415
456
if(p == NULL){
416
457
return ARGP_ERR_UNKNOWN;
417
458
}
418
459
p->disabled = true;
419
460
}
420
461
break;
421
case 128:
422
plugindir = arg;
423
break;
424
case 129:
462
case 'e': /* --enable */
463
if (arg != NULL){
464
plugin *p = getplugin(arg);
465
if(p == NULL){
466
return ARGP_ERR_UNKNOWN;
467
}
468
p->disabled = false;
469
}
470
break;
471
case 128: /* --plugin-dir */
472
plugindir = strdup(arg);
473
if(plugindir == NULL){
474
perror("strdup");
475
}
476
break;
477
case 129: /* --config-file */
478
/* This is already done by parse_opt_config_file() */
479
break;
480
case 130: /* --userid */
425
481
uid = (uid_t)strtol(arg, NULL, 10);
426
482
break;
427
case 130:
483
case 131: /* --groupid */
428
484
gid = (gid_t)strtol(arg, NULL, 10);
429
485
break;
430
case 131:
486
case 132: /* --debug */
431
487
debug = true;
432
488
break;
433
489
case ARGP_KEY_ARG:
441
497
return 0;
442
498
}
443
499
444
plugin *plugin_list = NULL;
500
/* This option parser is the same as parse_opt() above, except it
501
ignores everything but the --config-file option. */
502
error_t parse_opt_config_file (int key, char *arg,
503
__attribute__((unused))
504
struct argp_state *state) {
505
switch (key) {
506
case 'g': /* --global-options */
507
case 'G': /* --global-env */
508
case 'o': /* --options-for */
509
case 'E': /* --env-for */
510
case 'd': /* --disable */
511
case 'e': /* --enable */
512
case 128: /* --plugin-dir */
513
break;
514
case 129: /* --config-file */
515
argfile = strdup(arg);
516
if(argfile == NULL){
517
perror("strdup");
518
}
519
break;
520
case 130: /* --userid */
521
case 131: /* --groupid */
522
case 132: /* --debug */
523
case ARGP_KEY_ARG:
524
case ARGP_KEY_END:
525
break;
526
default:
527
return ARGP_ERR_UNKNOWN;
528
}
529
return 0;
530
}
445
531
446
struct argp argp = { .options = options, .parser = parse_opt,
447
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
532
struct argp argp = { .options = options,
533
.parser = parse_opt_config_file,
534
.args_doc = "",
448
535
.doc = "Mandos plugin runner -- Run plugins" };
449
536
450
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
537
/* Parse using the parse_opt_config_file in order to get the custom
538
config file location, if any. */
539
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
451
540
if (ret == ARGP_ERR_UNKNOWN){
452
541
fprintf(stderr, "Unknown error while parsing arguments\n");
453
542
exitstatus = EXIT_FAILURE;
454
543
goto fallback;
455
544
}
456
457
conffp = fopen(argfile, "r");
545
546
/* Reset to the normal argument parser */
547
argp.parser = parse_opt;
548
549
/* Open the configfile if available */
550
if (argfile == NULL){
551
conffp = fopen(AFILE, "r");
552
} else {
553
conffp = fopen(argfile, "r");
554
}
458
555
if(conffp != NULL){
459
556
char *org_line = NULL;
460
557
char *p, *arg, *new_arg, *line;
463
560
const char whitespace_delims[] = " \r\t\f\v\n";
464
561
const char comment_delim[] = "#";
465
562
563
custom_argc = 1;
564
custom_argv = malloc(sizeof(char*) * 2);
565
if(custom_argv == NULL){
566
perror("malloc");
567
exitstatus = EXIT_FAILURE;
568
goto fallback;
569
}
570
custom_argv[0] = argv[0];
571
custom_argv[1] = NULL;
572
573
/* for each line in the config file, strip whitespace and ignore
574
commented text */
466
575
while(true){
467
576
sret = getline(&org_line, &size, conffp);
468
577
if(sret == -1){
476
585
continue;
477
586
}
478
587
new_arg = strdup(p);
479
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
480
if (custom_argv == NULL){
481
perror("add_to_argv");
482
exitstatus = EXIT_FAILURE;
483
goto fallback;
484
}
588
if(new_arg == NULL){
589
perror("strdup");
590
exitstatus = EXIT_FAILURE;
591
free(org_line);
592
goto fallback;
593
}
594
595
custom_argc += 1;
596
custom_argv = realloc(custom_argv, sizeof(char *)
597
* ((unsigned int) custom_argc + 1));
598
if(custom_argv == NULL){
599
perror("realloc");
600
exitstatus = EXIT_FAILURE;
601
free(org_line);
602
goto fallback;
603
}
604
custom_argv[custom_argc-1] = new_arg;
605
custom_argv[custom_argc] = NULL;
485
606
}
486
607
}
487
608
free(org_line);
488
} else{
609
} else {
489
610
/* Check for harmful errors and go to fallback. Other errors might
490
611
not affect opening plugins */
491
612
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
494
615
goto fallback;
495
616
}
496
617
}
497
618
/* If there was any arguments from configuration file,
619
pass them to parser as command arguments */
498
620
if(custom_argv != NULL){
499
custom_argv[0] = argv[0];
500
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
621
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
622
0, NULL);
501
623
if (ret == ARGP_ERR_UNKNOWN){
502
624
fprintf(stderr, "Unknown error while parsing arguments\n");
503
625
exitstatus = EXIT_FAILURE;
505
627
}
506
628
}
507
629
630
/* Parse actual command line arguments, to let them override the
631
config file */
632
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
633
if (ret == ARGP_ERR_UNKNOWN){
634
fprintf(stderr, "Unknown error while parsing arguments\n");
635
exitstatus = EXIT_FAILURE;
636
goto fallback;
637
}
638
508
639
if(debug){
509
640
for(plugin *p = plugin_list; p != NULL; p=p->next){
510
641
fprintf(stderr, "Plugin: %s has %d arguments\n",
519
650
}
520
651
}
521
652
653
/* Strip permissions down to nobody */
522
654
ret = setuid(uid);
523
655
if (ret == -1){
524
656
perror("setuid");
525
}
526
657
}
527
658
setgid(gid);
528
659
if (ret == -1){
529
660
perror("setgid");
530
661
}
531
662
532
dir = opendir(plugindir);
663
if (plugindir == NULL){
664
dir = opendir(PDIR);
665
} else {
666
dir = opendir(plugindir);
667
}
668
533
669
if(dir == NULL){
534
670
perror("Could not open plugin dir");
535
671
exitstatus = EXIT_FAILURE;
551
687
552
688
FD_ZERO(&rfds_all);
553
689
690
/* Read and execute any executable in the plugin directory*/
554
691
while(true){
555
692
dirst = readdir(dir);
556
693
557
// All directory entries have been processed
694
/* All directory entries have been processed */
558
695
if(dirst == NULL){
559
696
if (errno == EBADF){
560
697
perror("readdir");
566
703
567
704
d_name_len = strlen(dirst->d_name);
568
705
569
// Ignore dotfiles, backup files and other junk
706
/* Ignore dotfiles, backup files and other junk */
570
707
{
571
708
bool bad_name = false;
572
709
587
724
break;
588
725
}
589
726
}
590
591
727
if(bad_name){
592
728
continue;
593
729
}
594
595
730
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
596
731
size_t suf_len = strlen(*suf);
597
732
if((d_name_len >= suf_len)
624
759
free(filename);
625
760
continue;
626
761
}
627
762
763
/* Ignore non-executable files */
628
764
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
629
765
if(debug){
630
766
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
633
769
free(filename);
634
770
continue;
635
771
}
636
plugin *p = getplugin(dirst->d_name, &plugin_list);
772
773
plugin *p = getplugin(dirst->d_name);
637
774
if(p == NULL){
638
775
perror("getplugin");
639
776
free(filename);
649
786
}
650
787
{
651
788
/* Add global arguments to argument list for this plugin */
652
plugin *g = getplugin(NULL, &plugin_list);
789
plugin *g = getplugin(NULL);
653
790
if(g != NULL){
654
791
for(char **a = g->argv + 1; *a != NULL; a++){
655
792
if(not add_argument(p, *a)){
658
795
}
659
796
/* Add global environment variables */
660
797
for(char **e = g->environ; *e != NULL; e++){
661
if(not add_environment(p, *e)){
798
if(not add_environment(p, *e, false)){
662
799
perror("add_environment");
663
800
}
664
801
}
669
806
process, too. */
670
807
if(p->environ[0] != NULL){
671
808
for(char **e = environ; *e != NULL; e++){
672
char *copy = strdup(*e);
673
if(copy == NULL){
674
perror("strdup");
675
continue;
676
}
677
if(not add_environment(p, copy)){
809
if(not add_environment(p, *e, false)){
678
810
perror("add_environment");
679
811
}
680
812
}
681
813
}
682
814
683
int pipefd[2];
815
int pipefd[2];
684
816
ret = pipe(pipefd);
685
817
if (ret == -1){
686
818
perror("pipe");
687
819
exitstatus = EXIT_FAILURE;
688
820
goto fallback;
689
821
}
822
/* Ask OS to automatic close the pipe on exec */
690
823
ret = set_cloexec_flag(pipefd[0]);
691
824
if(ret < 0){
692
825
perror("set_cloexec_flag");
706
839
exitstatus = EXIT_FAILURE;
707
840
goto fallback;
708
841
}
709
// Starting a new process to be watched
842
/* Starting a new process to be watched */
710
843
pid_t pid = fork();
711
844
if(pid == -1){
712
845
perror("fork");
750
883
}
751
884
/* no return */
752
885
}
753
/* parent process */
886
/* Parent process */
887
close(pipefd[1]); /* Close unused write end of pipe */
754
888
free(filename);
755
close(pipefd[1]); /* close unused write end of pipe */
756
process *new_process = malloc(sizeof(process));
757
if (new_process == NULL){
758
perror("malloc");
889
plugin *new_plugin = getplugin(dirst->d_name);
890
if (new_plugin == NULL){
891
perror("getplugin");
759
892
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
760
893
if(ret < 0){
761
perror("sigprocmask");
894
perror("sigprocmask");
762
895
}
763
896
exitstatus = EXIT_FAILURE;
764
897
goto fallback;
765
898
}
766
899
767
*new_process = (struct process){ .pid = pid,
768
.fd = pipefd[0],
769
.next = process_list };
770
// List handling
771
process_list = new_process;
900
new_plugin->pid = pid;
901
new_plugin->fd = pipefd[0];
902
772
903
/* Unblock SIGCHLD so signal handler can be run if this process
773
904
has already completed */
774
905
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
778
909
goto fallback;
779
910
}
780
911
781
FD_SET(new_process->fd, &rfds_all);
912
FD_SET(new_plugin->fd, &rfds_all);
782
913
783
if (maxfd < new_process->fd){
784
maxfd = new_process->fd;
914
if (maxfd < new_plugin->fd){
915
maxfd = new_plugin->fd;
785
916
}
786
917
787
918
}
788
919
789
free_plugin_list(plugin_list);
790
791
920
closedir(dir);
792
921
dir = NULL;
793
794
if (process_list == NULL){
795
fprintf(stderr, "No plugin processes started. Incorrect plugin"
796
" directory?\n");
797
process_list = NULL;
922
923
for(plugin *p = plugin_list; p != NULL; p = p->next){
924
if(p->pid != 0){
925
break;
926
}
927
if(p->next == NULL){
928
fprintf(stderr, "No plugin processes started. Incorrect plugin"
929
" directory?\n");
930
free_plugin_list();
931
}
798
932
}
799
while(process_list){
933
934
/* Main loop while running plugins exist */
935
while(plugin_list){
800
936
fd_set rfds = rfds_all;
801
937
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
802
938
if (select_ret == -1){
806
942
}
807
943
/* OK, now either a process completed, or something can be read
808
944
from one of them */
809
for(process *proc = process_list; proc ; proc = proc->next){
945
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
810
946
/* Is this process completely done? */
811
947
if(proc->eof and proc->completed){
812
948
/* Only accept the plugin output if it exited cleanly */
813
949
if(not WIFEXITED(proc->status)
814
950
or WEXITSTATUS(proc->status) != 0){
815
951
/* Bad exit by plugin */
952
816
953
if(debug){
817
954
if(WIFEXITED(proc->status)){
818
955
fprintf(stderr, "Plugin %u exited with status %d\n",
827
964
(unsigned int) (proc->pid));
828
965
}
829
966
}
967
830
968
/* Remove the plugin */
831
969
FD_CLR(proc->fd, &rfds_all);
970
832
971
/* Block signal while modifying process_list */
833
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
972
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
834
973
if(ret < 0){
835
974
perror("sigprocmask");
836
975
exitstatus = EXIT_FAILURE;
837
976
goto fallback;
838
977
}
839
/* Delete this process entry from the list */
840
if(process_list == proc){
841
/* First one - simple */
842
process_list = proc->next;
843
} else {
844
/* Second one or later */
845
for(process *p = process_list; p != NULL; p = p->next){
846
if(p->next == proc){
847
p->next = proc->next;
848
break;
849
}
850
}
851
}
978
free_plugin(proc);
852
979
/* We are done modifying process list, so unblock signal */
853
980
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
854
981
NULL);
855
982
if(ret < 0){
856
983
perror("sigprocmask");
857
}
858
free(proc->buffer);
859
free(proc);
860
/* We deleted this process from the list, so we can't go
861
proc->next. Therefore, start over from the beginning of
862
the process list */
863
break;
984
exitstatus = EXIT_FAILURE;
985
goto fallback;
986
}
987
988
if(plugin_list == NULL){
989
break;
990
}
991
continue;
864
992
}
993
865
994
/* This process exited nicely, so print its buffer */
866
995
867
bool bret = print_out_password(proc->buffer, proc->buffer_length);
996
bool bret = print_out_password(proc->buffer,
997
proc->buffer_length);
868
998
if(not bret){
869
999
perror("print_out_password");
870
1000
exitstatus = EXIT_FAILURE;
871
1001
}
872
1002
goto fallback;
873
1003
}
1004
874
1005
/* This process has not completed. Does it have any output? */
875
1006
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
876
1007
/* This process had nothing to say at this time */
906
1037
907
1038
fallback:
908
1039
909
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
910
/* Fallback if all plugins failed, none are found or an error occured */
1040
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1041
/* Fallback if all plugins failed, none are found or an error
1042
occured */
911
1043
bool bret;
912
1044
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
913
1045
char *passwordbuffer = getpass("Password: ");
926
1058
}
927
1059
928
1060
if(custom_argv != NULL){
929
for(char **arg = custom_argv; *arg != NULL; arg++){
1061
for(char **arg = custom_argv+1; *arg != NULL; arg++){
930
1062
free(*arg);
931
1063
}
932
1064
free(custom_argv);
933
1065
}
934
free_plugin_list(plugin_list);
935
1066
936
1067
if(dir != NULL){
937
1068
closedir(dir);
938
1069
}
939
1070
940
1071
/* Free the process list and kill the processes */
941
for(process *next; process_list != NULL; process_list = next){
942
next = process_list->next;
943
close(process_list->fd);
944
ret = kill(process_list->pid, SIGTERM);
945
if(ret == -1 and errno != ESRCH){
946
/* set-uid proccesses migth not get closed */
947
perror("kill");
1072
for(plugin *p = plugin_list; p != NULL; p = p->next){
1073
if(p->pid != 0){
1074
close(p->fd);
1075
ret = kill(p->pid, SIGTERM);
1076
if(ret == -1 and errno != ESRCH){
1077
/* Set-uid proccesses might not get closed */
1078
perror("kill");
1079
}
948
1080
}
949
free(process_list->buffer);
950
free(process_list);
951
1081
}
952
1082
953
1083
/* Wait for any remaining child processes to terminate */
957
1087
if(errno != ECHILD){
958
1088
perror("wait");
959
1089
}
1090
1091
free_plugin_list();
1092
1093
free(plugindir);
1094
free(argfile);
960
1095
961
1096
return exitstatus;
962
1097
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0