To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 176
- compare with another revision
- download diff
- download tarball
- view history from revision 176
- Committer: Teddy Hogeborn
- Date: 2008-09-07 01:44:44 UTC
- mfrom: (24.1.93 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080907014444-cf4ilzndc0tbn8va
Merge & resolve.
- files added:
- .bzrignore
- 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
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 an 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;
115
121
116
122
*new_plugin = (plugin) { .name = copy_name,
117
123
.argc = 1,
118
.envc = 0,
119
124
.disabled = false,
120
.next = *plugin_list };
125
.next = plugin_list };
121
126
122
127
new_plugin->argv = malloc(sizeof(char *) * 2);
123
128
if (new_plugin->argv == NULL){
127
132
}
128
133
new_plugin->argv[0] = copy_name;
129
134
new_plugin->argv[1] = NULL;
130
135
131
136
new_plugin->environ = malloc(sizeof(char *));
132
137
if(new_plugin->environ == NULL){
133
138
free(copy_name);
136
141
return NULL;
137
142
}
138
143
new_plugin->environ[0] = NULL;
144
139
145
/* Append the new plugin to the list */
140
*plugin_list = new_plugin;
146
plugin_list = new_plugin;
141
147
return new_plugin;
142
148
}
143
149
173
179
}
174
180
175
181
/* Add to a plugin's environment */
176
static bool add_environment(plugin *p, const char *def){
182
static bool add_environment(plugin *p, const char *def, bool replace){
177
183
if(p == NULL){
178
184
return false;
179
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) + 1);
194
if(new == NULL){
195
return false;
196
}
197
*e = new;
198
strcpy(*e, def);
199
}
200
return true;
201
}
202
}
180
203
return add_to_char_array(def, &(p->environ), &(p->envc));
181
204
}
182
205
183
184
206
/*
185
207
* Based on the example in the GNU LibC manual chapter 13.13 "File
186
208
* Descriptor Flags".
197
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
198
220
}
199
221
200
process *process_list = NULL;
201
222
202
/* Mark a process as completed when it exits, and save its exit
223
/* Mark processes as completed when they exit, and save their exit
203
224
status. */
204
225
void handle_sigchld(__attribute__((unused)) int sig){
205
process *proc = process_list;
206
int status;
207
pid_t pid = wait(&status);
208
if(pid == -1){
209
perror("wait");
210
return;
211
}
212
while(proc != NULL and proc->pid != pid){
213
proc = proc->next;
214
}
215
if(proc == NULL){
216
/* Process not found in process list */
217
return;
218
}
219
proc->status = status;
220
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
}
221
253
}
222
254
255
/* Prints out a password to stdout */
223
256
bool print_out_password(const char *buffer, size_t length){
224
257
ssize_t ret;
225
if(length>0 and buffer[length-1] == '\n'){
226
length--;
227
}
228
258
for(size_t written = 0; written < length; written += (size_t)ret){
229
259
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
230
260
length - written));
235
265
return true;
236
266
}
237
267
238
char **add_to_argv(char **argv, int *argc, char *arg){
239
if (argv == NULL){
240
*argc = 1;
241
argv = malloc(sizeof(char*) * 2);
242
if(argv == NULL){
243
return NULL;
268
/* Removes and free a plugin from the plugin list */
269
static void free_plugin(plugin *plugin_node){
270
271
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
272
free(*arg);
273
}
274
free(plugin_node->argv);
275
for(char **env = plugin_node->environ; *env != NULL; env++){
276
free(*env);
277
}
278
free(plugin_node->environ);
279
free(plugin_node->buffer);
280
281
/* Removes the plugin from the singly-linked list */
282
if(plugin_node == plugin_list){
283
/* First one - simple */
284
plugin_list = plugin_list->next;
285
} else {
286
/* Second one or later */
287
for(plugin *p = plugin_list; p != NULL; p = p->next){
288
if(p->next == plugin_node){
289
p->next = plugin_node->next;
290
break;
291
}
244
292
}
245
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
246
argv[1] = NULL;
247
}
248
*argc += 1;
249
argv = realloc(argv, sizeof(char *)
250
* ((unsigned int) *argc + 1));
251
if(argv == NULL){
252
return NULL;
253
}
254
argv[*argc-1] = arg;
255
argv[*argc] = NULL;
256
return argv;
293
}
294
295
free(plugin_node);
257
296
}
258
297
259
static void free_plugin_list(plugin *plugin_list){
260
for(plugin *next; plugin_list != NULL; plugin_list = next){
261
next = plugin_list->next;
262
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
263
free(*arg);
264
}
265
free(plugin_list->argv);
266
for(char **env = plugin_list->environ; *env != NULL; env++){
267
free(*env);
268
}
269
free(plugin_list->environ);
270
free(plugin_list);
298
static void free_plugin_list(void){
299
while(plugin_list != NULL){
300
free_plugin(plugin_list);
271
301
}
272
302
}
273
303
274
304
int main(int argc, char *argv[]){
275
const char *plugindir = "/lib/mandos/plugins.d";
276
const char *argfile = ARGFILE;
305
char *plugindir = NULL;
306
char *argfile = NULL;
277
307
FILE *conffp;
278
308
size_t d_name_len;
279
309
DIR *dir = NULL;
311
341
{ .name = "global-options", .key = 'g',
312
342
.arg = "OPTION[,OPTION[,...]]",
313
343
.doc = "Options passed to all plugins" },
314
{ .name = "global-envs", .key = 'e',
344
{ .name = "global-env", .key = 'G',
315
345
.arg = "VAR=value",
316
346
.doc = "Environment variable passed to all plugins" },
317
347
{ .name = "options-for", .key = 'o',
318
348
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
319
349
.doc = "Options passed only to specified plugin" },
320
{ .name = "envs-for", .key = 'f',
350
{ .name = "env-for", .key = 'E',
321
351
.arg = "PLUGIN:ENV=value",
322
352
.doc = "Environment variable passed to specified plugin" },
323
353
{ .name = "disable", .key = 'd',
324
354
.arg = "PLUGIN",
325
355
.doc = "Disable a specific plugin", .group = 1 },
356
{ .name = "enable", .key = 'e',
357
.arg = "PLUGIN",
358
.doc = "Enable a specific plugin", .group = 1 },
326
359
{ .name = "plugin-dir", .key = 128,
327
360
.arg = "DIRECTORY",
328
361
.doc = "Specify a different plugin directory", .group = 2 },
329
{ .name = "userid", .key = 129,
330
.arg = "ID", .flags = 0,
331
.doc = "User ID the plugins will run as", .group = 2 },
332
{ .name = "groupid", .key = 130,
333
.arg = "ID", .flags = 0,
334
.doc = "Group ID the plugins will run as", .group = 2 },
335
{ .name = "debug", .key = 131,
336
.doc = "Debug mode", .group = 3 },
362
{ .name = "config-file", .key = 129,
363
.arg = "FILE",
364
.doc = "Specify a different configuration file", .group = 2 },
365
{ .name = "userid", .key = 130,
366
.arg = "ID", .flags = 0,
367
.doc = "User ID the plugins will run as", .group = 3 },
368
{ .name = "groupid", .key = 131,
369
.arg = "ID", .flags = 0,
370
.doc = "Group ID the plugins will run as", .group = 3 },
371
{ .name = "debug", .key = 132,
372
.doc = "Debug mode", .group = 4 },
337
373
{ .name = NULL }
338
374
};
339
375
340
error_t parse_opt (int key, char *arg, struct argp_state *state) {
341
/* Get the INPUT argument from `argp_parse', which we know is a
342
pointer to our plugin list pointer. */
343
plugin **plugins = state->input;
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
344
378
switch (key) {
345
case 'g':
379
case 'g': /* --global-options */
346
380
if (arg != NULL){
347
381
char *p;
348
382
while((p = strsep(&arg, ",")) != NULL){
349
383
if(p[0] == '\0'){
350
384
continue;
351
385
}
352
if(not add_argument(getplugin(NULL, plugins), p)){
386
if(not add_argument(getplugin(NULL), p)){
353
387
perror("add_argument");
354
388
return ARGP_ERR_UNKNOWN;
355
389
}
356
390
}
357
391
}
358
392
break;
359
case 'e':
393
case 'G': /* --global-env */
360
394
if(arg == NULL){
361
395
break;
362
396
}
363
{
364
char *envdef = strdup(arg);
365
if(envdef == NULL){
366
break;
367
}
368
if(not add_environment(getplugin(NULL, plugins), envdef)){
369
perror("add_environment");
370
}
397
if(not add_environment(getplugin(NULL), arg, true)){
398
perror("add_environment");
371
399
}
372
400
break;
373
case 'o':
401
case 'o': /* --options-for */
374
402
if (arg != NULL){
375
403
char *p_name = strsep(&arg, ":");
376
if(p_name[0] == '\0'){
404
if(p_name[0] == '\0' or arg == NULL){
377
405
break;
378
406
}
379
407
char *opt = strsep(&arg, ":");
380
if(opt[0] == '\0'){
408
if(opt[0] == '\0' or opt == NULL){
381
409
break;
382
410
}
383
if(opt != NULL){
384
char *p;
385
while((p = strsep(&opt, ",")) != NULL){
386
if(p[0] == '\0'){
387
continue;
388
}
389
if(not add_argument(getplugin(p_name, plugins), p)){
390
perror("add_argument");
391
return ARGP_ERR_UNKNOWN;
392
}
411
char *p;
412
while((p = strsep(&opt, ",")) != NULL){
413
if(p[0] == '\0'){
414
continue;
415
}
416
if(not add_argument(getplugin(p_name), p)){
417
perror("add_argument");
418
return ARGP_ERR_UNKNOWN;
393
419
}
394
420
}
395
421
}
396
422
break;
397
case 'f':
423
case 'E': /* --env-for */
398
424
if(arg == NULL){
399
425
break;
400
426
}
403
429
if(envdef == NULL){
404
430
break;
405
431
}
406
char *p_name = strndup(arg, (size_t) (envdef-arg));
407
if(p_name == NULL){
408
break;
409
}
410
envdef++;
411
if(not add_environment(getplugin(p_name, plugins), envdef)){
432
*envdef = '\0';
433
if(not add_environment(getplugin(arg), envdef+1, true)){
412
434
perror("add_environment");
413
435
}
414
436
}
415
437
break;
416
case 'd':
438
case 'd': /* --disable */
417
439
if (arg != NULL){
418
plugin *p = getplugin(arg, plugins);
440
plugin *p = getplugin(arg);
419
441
if(p == NULL){
420
442
return ARGP_ERR_UNKNOWN;
421
443
}
422
444
p->disabled = true;
423
445
}
424
446
break;
425
case 128:
426
plugindir = arg;
427
break;
428
case 129:
447
case 'e': /* --enable */
448
if (arg != NULL){
449
plugin *p = getplugin(arg);
450
if(p == NULL){
451
return ARGP_ERR_UNKNOWN;
452
}
453
p->disabled = false;
454
}
455
break;
456
case 128: /* --plugin-dir */
457
free(plugindir);
458
plugindir = strdup(arg);
459
if(plugindir == NULL){
460
perror("strdup");
461
}
462
break;
463
case 129: /* --config-file */
464
/* This is already done by parse_opt_config_file() */
465
break;
466
case 130: /* --userid */
429
467
uid = (uid_t)strtol(arg, NULL, 10);
430
468
break;
431
case 130:
469
case 131: /* --groupid */
432
470
gid = (gid_t)strtol(arg, NULL, 10);
433
471
break;
434
case 131:
472
case 132: /* --debug */
435
473
debug = true;
436
474
break;
437
475
case ARGP_KEY_ARG:
445
483
return 0;
446
484
}
447
485
448
plugin *plugin_list = NULL;
486
/* This option parser is the same as parse_opt() above, except it
487
ignores everything but the --config-file option. */
488
error_t parse_opt_config_file (int key, char *arg,
489
__attribute__((unused))
490
struct argp_state *state) {
491
switch (key) {
492
case 'g': /* --global-options */
493
case 'G': /* --global-env */
494
case 'o': /* --options-for */
495
case 'E': /* --env-for */
496
case 'd': /* --disable */
497
case 'e': /* --enable */
498
case 128: /* --plugin-dir */
499
break;
500
case 129: /* --config-file */
501
free(argfile);
502
argfile = strdup(arg);
503
if(argfile == NULL){
504
perror("strdup");
505
}
506
break;
507
case 130: /* --userid */
508
case 131: /* --groupid */
509
case 132: /* --debug */
510
case ARGP_KEY_ARG:
511
case ARGP_KEY_END:
512
break;
513
default:
514
return ARGP_ERR_UNKNOWN;
515
}
516
return 0;
517
}
449
518
450
struct argp argp = { .options = options, .parser = parse_opt,
451
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
519
struct argp argp = { .options = options,
520
.parser = parse_opt_config_file,
521
.args_doc = "",
452
522
.doc = "Mandos plugin runner -- Run plugins" };
453
523
454
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
524
/* Parse using the parse_opt_config_file in order to get the custom
525
config file location, if any. */
526
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
455
527
if (ret == ARGP_ERR_UNKNOWN){
456
528
fprintf(stderr, "Unknown error while parsing arguments\n");
457
529
exitstatus = EXIT_FAILURE;
458
530
goto fallback;
459
531
}
460
461
conffp = fopen(argfile, "r");
532
533
/* Reset to the normal argument parser */
534
argp.parser = parse_opt;
535
536
/* Open the configfile if available */
537
if (argfile == NULL){
538
conffp = fopen(AFILE, "r");
539
} else {
540
conffp = fopen(argfile, "r");
541
}
462
542
if(conffp != NULL){
463
543
char *org_line = NULL;
464
544
char *p, *arg, *new_arg, *line;
467
547
const char whitespace_delims[] = " \r\t\f\v\n";
468
548
const char comment_delim[] = "#";
469
549
550
custom_argc = 1;
551
custom_argv = malloc(sizeof(char*) * 2);
552
if(custom_argv == NULL){
553
perror("malloc");
554
exitstatus = EXIT_FAILURE;
555
goto fallback;
556
}
557
custom_argv[0] = argv[0];
558
custom_argv[1] = NULL;
559
560
/* for each line in the config file, strip whitespace and ignore
561
commented text */
470
562
while(true){
471
563
sret = getline(&org_line, &size, conffp);
472
564
if(sret == -1){
480
572
continue;
481
573
}
482
574
new_arg = strdup(p);
483
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
484
if (custom_argv == NULL){
485
perror("add_to_argv");
486
exitstatus = EXIT_FAILURE;
487
goto fallback;
488
}
575
if(new_arg == NULL){
576
perror("strdup");
577
exitstatus = EXIT_FAILURE;
578
free(org_line);
579
goto fallback;
580
}
581
582
custom_argc += 1;
583
custom_argv = realloc(custom_argv, sizeof(char *)
584
* ((unsigned int) custom_argc + 1));
585
if(custom_argv == NULL){
586
perror("realloc");
587
exitstatus = EXIT_FAILURE;
588
free(org_line);
589
goto fallback;
590
}
591
custom_argv[custom_argc-1] = new_arg;
592
custom_argv[custom_argc] = NULL;
489
593
}
490
594
}
491
595
free(org_line);
492
} else{
596
} else {
493
597
/* Check for harmful errors and go to fallback. Other errors might
494
598
not affect opening plugins */
495
599
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
498
602
goto fallback;
499
603
}
500
604
}
501
605
/* If there was any arguments from configuration file,
606
pass them to parser as command arguments */
502
607
if(custom_argv != NULL){
503
custom_argv[0] = argv[0];
504
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
608
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
609
0, NULL);
505
610
if (ret == ARGP_ERR_UNKNOWN){
506
611
fprintf(stderr, "Unknown error while parsing arguments\n");
507
612
exitstatus = EXIT_FAILURE;
509
614
}
510
615
}
511
616
617
/* Parse actual command line arguments, to let them override the
618
config file */
619
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
620
if (ret == ARGP_ERR_UNKNOWN){
621
fprintf(stderr, "Unknown error while parsing arguments\n");
622
exitstatus = EXIT_FAILURE;
623
goto fallback;
624
}
625
512
626
if(debug){
513
627
for(plugin *p = plugin_list; p != NULL; p=p->next){
514
628
fprintf(stderr, "Plugin: %s has %d arguments\n",
523
637
}
524
638
}
525
639
640
/* Strip permissions down to nobody */
526
641
ret = setuid(uid);
527
642
if (ret == -1){
528
643
perror("setuid");
529
}
530
644
}
531
645
setgid(gid);
532
646
if (ret == -1){
533
647
perror("setgid");
534
648
}
535
649
536
dir = opendir(plugindir);
650
if (plugindir == NULL){
651
dir = opendir(PDIR);
652
} else {
653
dir = opendir(plugindir);
654
}
655
537
656
if(dir == NULL){
538
657
perror("Could not open plugin dir");
539
658
exitstatus = EXIT_FAILURE;
555
674
556
675
FD_ZERO(&rfds_all);
557
676
677
/* Read and execute any executable in the plugin directory*/
558
678
while(true){
559
679
dirst = readdir(dir);
560
680
561
// All directory entries have been processed
681
/* All directory entries have been processed */
562
682
if(dirst == NULL){
563
683
if (errno == EBADF){
564
684
perror("readdir");
570
690
571
691
d_name_len = strlen(dirst->d_name);
572
692
573
// Ignore dotfiles, backup files and other junk
693
/* Ignore dotfiles, backup files and other junk */
574
694
{
575
695
bool bad_name = false;
576
696
591
711
break;
592
712
}
593
713
}
594
595
714
if(bad_name){
596
715
continue;
597
716
}
598
599
717
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
600
718
size_t suf_len = strlen(*suf);
601
719
if((d_name_len >= suf_len)
616
734
}
617
735
618
736
char *filename;
619
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
737
if(plugindir == NULL){
738
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
739
} else {
740
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
741
}
620
742
if(ret < 0){
621
743
perror("asprintf");
622
744
continue;
628
750
free(filename);
629
751
continue;
630
752
}
631
753
754
/* Ignore non-executable files */
632
755
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
633
756
if(debug){
634
757
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
637
760
free(filename);
638
761
continue;
639
762
}
640
plugin *p = getplugin(dirst->d_name, &plugin_list);
763
764
plugin *p = getplugin(dirst->d_name);
641
765
if(p == NULL){
642
766
perror("getplugin");
643
767
free(filename);
653
777
}
654
778
{
655
779
/* Add global arguments to argument list for this plugin */
656
plugin *g = getplugin(NULL, &plugin_list);
780
plugin *g = getplugin(NULL);
657
781
if(g != NULL){
658
782
for(char **a = g->argv + 1; *a != NULL; a++){
659
783
if(not add_argument(p, *a)){
662
786
}
663
787
/* Add global environment variables */
664
788
for(char **e = g->environ; *e != NULL; e++){
665
if(not add_environment(p, *e)){
789
if(not add_environment(p, *e, false)){
666
790
perror("add_environment");
667
791
}
668
792
}
673
797
process, too. */
674
798
if(p->environ[0] != NULL){
675
799
for(char **e = environ; *e != NULL; e++){
676
char *copy = strdup(*e);
677
if(copy == NULL){
678
perror("strdup");
679
continue;
680
}
681
if(not add_environment(p, copy)){
800
if(not add_environment(p, *e, false)){
682
801
perror("add_environment");
683
802
}
684
803
}
691
810
exitstatus = EXIT_FAILURE;
692
811
goto fallback;
693
812
}
813
/* Ask OS to automatic close the pipe on exec */
694
814
ret = set_cloexec_flag(pipefd[0]);
695
815
if(ret < 0){
696
816
perror("set_cloexec_flag");
710
830
exitstatus = EXIT_FAILURE;
711
831
goto fallback;
712
832
}
713
// Starting a new process to be watched
833
/* Starting a new process to be watched */
714
834
pid_t pid = fork();
715
835
if(pid == -1){
716
836
perror("fork");
754
874
}
755
875
/* no return */
756
876
}
757
/* parent process */
877
/* Parent process */
878
close(pipefd[1]); /* Close unused write end of pipe */
758
879
free(filename);
759
close(pipefd[1]); /* close unused write end of pipe */
760
process *new_process = malloc(sizeof(process));
761
if (new_process == NULL){
762
perror("malloc");
880
plugin *new_plugin = getplugin(dirst->d_name);
881
if (new_plugin == NULL){
882
perror("getplugin");
763
883
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
764
884
if(ret < 0){
765
perror("sigprocmask");
885
perror("sigprocmask");
766
886
}
767
887
exitstatus = EXIT_FAILURE;
768
888
goto fallback;
769
889
}
770
890
771
*new_process = (struct process){ .pid = pid,
772
.fd = pipefd[0],
773
.next = process_list };
774
// List handling
775
process_list = new_process;
891
new_plugin->pid = pid;
892
new_plugin->fd = pipefd[0];
893
776
894
/* Unblock SIGCHLD so signal handler can be run if this process
777
895
has already completed */
778
896
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
782
900
goto fallback;
783
901
}
784
902
785
FD_SET(new_process->fd, &rfds_all);
903
FD_SET(new_plugin->fd, &rfds_all);
786
904
787
if (maxfd < new_process->fd){
788
maxfd = new_process->fd;
905
if (maxfd < new_plugin->fd){
906
maxfd = new_plugin->fd;
789
907
}
790
908
791
909
}
792
910
793
free_plugin_list(plugin_list);
794
plugin_list = NULL;
795
796
911
closedir(dir);
797
912
dir = NULL;
798
799
if (process_list == NULL){
800
fprintf(stderr, "No plugin processes started. Incorrect plugin"
801
" directory?\n");
802
process_list = NULL;
913
914
for(plugin *p = plugin_list; p != NULL; p = p->next){
915
if(p->pid != 0){
916
break;
917
}
918
if(p->next == NULL){
919
fprintf(stderr, "No plugin processes started. Incorrect plugin"
920
" directory?\n");
921
free_plugin_list();
922
}
803
923
}
804
while(process_list){
924
925
/* Main loop while running plugins exist */
926
while(plugin_list){
805
927
fd_set rfds = rfds_all;
806
928
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
807
929
if (select_ret == -1){
811
933
}
812
934
/* OK, now either a process completed, or something can be read
813
935
from one of them */
814
for(process *proc = process_list; proc ; proc = proc->next){
936
for(plugin *proc = plugin_list; proc != NULL;){
815
937
/* Is this process completely done? */
816
938
if(proc->eof and proc->completed){
817
939
/* Only accept the plugin output if it exited cleanly */
818
940
if(not WIFEXITED(proc->status)
819
941
or WEXITSTATUS(proc->status) != 0){
820
942
/* Bad exit by plugin */
943
821
944
if(debug){
822
945
if(WIFEXITED(proc->status)){
823
946
fprintf(stderr, "Plugin %u exited with status %d\n",
832
955
(unsigned int) (proc->pid));
833
956
}
834
957
}
958
835
959
/* Remove the plugin */
836
960
FD_CLR(proc->fd, &rfds_all);
961
837
962
/* Block signal while modifying process_list */
838
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
963
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
839
964
if(ret < 0){
840
965
perror("sigprocmask");
841
966
exitstatus = EXIT_FAILURE;
842
967
goto fallback;
843
968
}
844
/* Delete this process entry from the list */
845
if(process_list == proc){
846
/* First one - simple */
847
process_list = proc->next;
848
} else {
849
/* Second one or later */
850
for(process *p = process_list; p != NULL; p = p->next){
851
if(p->next == proc){
852
p->next = proc->next;
853
break;
854
}
855
}
856
}
969
857
970
/* We are done modifying process list, so unblock signal */
858
971
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
859
972
NULL);
860
973
if(ret < 0){
861
974
perror("sigprocmask");
862
}
863
free(proc->buffer);
864
free(proc);
865
/* We deleted this process from the list, so we can't go
866
proc->next. Therefore, start over from the beginning of
867
the process list */
868
break;
975
exitstatus = EXIT_FAILURE;
976
goto fallback;
977
}
978
979
if(plugin_list == NULL){
980
break;
981
}
982
983
plugin *next_plugin = proc->next;
984
free_plugin(proc);
985
proc = next_plugin;
986
continue;
869
987
}
988
870
989
/* This process exited nicely, so print its buffer */
871
990
872
bool bret = print_out_password(proc->buffer, proc->buffer_length);
991
bool bret = print_out_password(proc->buffer,
992
proc->buffer_length);
873
993
if(not bret){
874
994
perror("print_out_password");
875
995
exitstatus = EXIT_FAILURE;
876
996
}
877
997
goto fallback;
878
998
}
999
879
1000
/* This process has not completed. Does it have any output? */
880
1001
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
881
1002
/* This process had nothing to say at this time */
1003
proc = proc->next;
882
1004
continue;
883
1005
}
884
1006
/* Before reading, make the process' data buffer large enough */
897
1019
BUFFER_SIZE);
898
1020
if(ret < 0){
899
1021
/* Read error from this process; ignore the error */
1022
proc = proc->next;
900
1023
continue;
901
1024
}
902
1025
if(ret == 0){
911
1034
912
1035
fallback:
913
1036
914
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
915
/* Fallback if all plugins failed, none are found or an error occured */
1037
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1038
/* Fallback if all plugins failed, none are found or an error
1039
occured */
916
1040
bool bret;
917
1041
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
918
1042
char *passwordbuffer = getpass("Password: ");
919
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1043
size_t len = strlen(passwordbuffer);
1044
/* Strip trailing newline */
1045
if(len > 0 and passwordbuffer[len-1] == '\n'){
1046
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1047
len--;
1048
}
1049
bret = print_out_password(passwordbuffer, len);
920
1050
if(not bret){
921
1051
perror("print_out_password");
922
1052
exitstatus = EXIT_FAILURE;
931
1061
}
932
1062
933
1063
if(custom_argv != NULL){
934
for(char **arg = custom_argv; *arg != NULL; arg++){
1064
for(char **arg = custom_argv+1; *arg != NULL; arg++){
935
1065
free(*arg);
936
1066
}
937
1067
free(custom_argv);
938
1068
}
939
free_plugin_list(plugin_list);
940
1069
941
1070
if(dir != NULL){
942
1071
closedir(dir);
943
1072
}
944
1073
945
1074
/* Free the process list and kill the processes */
946
for(process *next; process_list != NULL; process_list = next){
947
next = process_list->next;
948
close(process_list->fd);
949
ret = kill(process_list->pid, SIGTERM);
950
if(ret == -1 and errno != ESRCH){
951
/* set-uid proccesses migth not get closed */
952
perror("kill");
1075
for(plugin *p = plugin_list; p != NULL; p = p->next){
1076
if(p->pid != 0){
1077
close(p->fd);
1078
ret = kill(p->pid, SIGTERM);
1079
if(ret == -1 and errno != ESRCH){
1080
/* Set-uid proccesses might not get closed */
1081
perror("kill");
1082
}
953
1083
}
954
free(process_list->buffer);
955
free(process_list);
956
1084
}
957
1085
958
1086
/* Wait for any remaining child processes to terminate */
962
1090
if(errno != ECHILD){
963
1091
perror("wait");
964
1092
}
1093
1094
free_plugin_list();
1095
1096
free(plugindir);
1097
free(argfile);
965
1098
966
1099
return exitstatus;
967
1100
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0