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- Committer: Teddy Hogeborn
- Date: 2008-08-24 09:40:58 UTC
- Revision ID: teddy@fukt.bsnet.se-20080824094058-bdqng3t1e3hfnk2e
* plugin-runner.c (getplugin): Only copy "name" if not NULL. Free
"copy_name" if any error occurs.
(free_plugin_list): Do not free "name" member; it it freed as part
of argv.
(main): Set plugin_list to NULL after freeing it.
"copy_name" if any error occurs.
(free_plugin_list): Do not free "name" member; it it freed as part
of argv.
(main): Set plugin_list to NULL after freeing it.
- files removed:
- .bzrignore
- debian
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
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,
60
error_t */
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
61
60
#include <signal.h> /* struct sigaction, sigemptyset(),
62
61
sigaddset(), sigaction(),
63
62
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
64
#include <errno.h> /* errno, EBADF */
66
65
67
66
#define BUFFER_SIZE 256
68
69
#define PDIR "/lib/mandos/plugins.d"
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
68
72
69
const char *argp_program_version = "plugin-runner 1.0";
73
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
71
75
struct plugin;
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;
76
85
77
86
typedef struct plugin{
78
87
char *name; /* can be NULL or any plugin name */
81
90
char **environ;
82
91
int envc;
83
92
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;
94
93
struct plugin *next;
95
94
} plugin;
96
95
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){
96
static plugin *getplugin(char *name, plugin **plugin_list){
97
for (plugin *p = *plugin_list; p != NULL; p = p->next){
104
98
if ((p->name == name)
105
99
or (p->name and name and (strcmp(p->name, name) == 0))){
106
100
return p;
121
115
122
116
*new_plugin = (plugin) { .name = copy_name,
123
117
.argc = 1,
118
.envc = 0,
124
119
.disabled = false,
125
.next = plugin_list };
120
.next = *plugin_list };
126
121
127
122
new_plugin->argv = malloc(sizeof(char *) * 2);
128
123
if (new_plugin->argv == NULL){
132
127
}
133
128
new_plugin->argv[0] = copy_name;
134
129
new_plugin->argv[1] = NULL;
135
130
136
131
new_plugin->environ = malloc(sizeof(char *));
137
132
if(new_plugin->environ == NULL){
138
133
free(copy_name);
141
136
return NULL;
142
137
}
143
138
new_plugin->environ[0] = NULL;
144
145
139
/* Append the new plugin to the list */
146
plugin_list = new_plugin;
140
*plugin_list = new_plugin;
147
141
return new_plugin;
148
142
}
149
143
179
173
}
180
174
181
175
/* Add to a plugin's environment */
182
static bool add_environment(plugin *p, const char *def, bool replace){
176
static bool add_environment(plugin *p, const char *def){
183
177
if(p == NULL){
184
178
return false;
185
179
}
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
}
203
180
return add_to_char_array(def, &(p->environ), &(p->envc));
204
181
}
205
182
183
206
184
/*
207
185
* Based on the example in the GNU LibC manual chapter 13.13 "File
208
186
* Descriptor Flags".
219
197
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
220
198
}
221
199
200
process *process_list = NULL;
222
201
223
/* Mark processes as completed when they exit, and save their exit
202
/* Mark a process as completed when it exits, and save its exit
224
203
status. */
225
204
void handle_sigchld(__attribute__((unused)) int sig){
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
}
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;
253
221
}
254
222
255
/* Prints out a password to stdout */
256
223
bool print_out_password(const char *buffer, size_t length){
257
224
ssize_t ret;
225
if(length>0 and buffer[length-1] == '\n'){
226
length--;
227
}
258
228
for(size_t written = 0; written < length; written += (size_t)ret){
259
229
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
260
230
length - written));
265
235
return true;
266
236
}
267
237
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
}
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;
292
244
}
293
}
294
295
free(plugin_node);
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;
296
257
}
297
258
298
static void free_plugin_list(void){
299
while(plugin_list != NULL){
300
free_plugin(plugin_list);
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);
301
271
}
302
272
}
303
273
304
274
int main(int argc, char *argv[]){
305
char *plugindir = NULL;
306
char *argfile = NULL;
275
const char *plugindir = "/lib/mandos/plugins.d";
276
const char *argfile = ARGFILE;
307
277
FILE *conffp;
308
278
size_t d_name_len;
309
279
DIR *dir = NULL;
341
311
{ .name = "global-options", .key = 'g',
342
312
.arg = "OPTION[,OPTION[,...]]",
343
313
.doc = "Options passed to all plugins" },
344
{ .name = "global-env", .key = 'G',
314
{ .name = "global-envs", .key = 'e',
345
315
.arg = "VAR=value",
346
316
.doc = "Environment variable passed to all plugins" },
347
317
{ .name = "options-for", .key = 'o',
348
318
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
349
319
.doc = "Options passed only to specified plugin" },
350
{ .name = "env-for", .key = 'E',
320
{ .name = "envs-for", .key = 'f',
351
321
.arg = "PLUGIN:ENV=value",
352
322
.doc = "Environment variable passed to specified plugin" },
353
323
{ .name = "disable", .key = 'd',
354
324
.arg = "PLUGIN",
355
325
.doc = "Disable a specific plugin", .group = 1 },
356
{ .name = "enable", .key = 'e',
357
.arg = "PLUGIN",
358
.doc = "Enable a specific plugin", .group = 1 },
359
326
{ .name = "plugin-dir", .key = 128,
360
327
.arg = "DIRECTORY",
361
328
.doc = "Specify a different plugin directory", .group = 2 },
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 },
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 },
373
337
{ .name = NULL }
374
338
};
375
339
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
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;
378
344
switch (key) {
379
case 'g': /* --global-options */
345
case 'g':
380
346
if (arg != NULL){
381
347
char *p;
382
348
while((p = strsep(&arg, ",")) != NULL){
383
349
if(p[0] == '\0'){
384
350
continue;
385
351
}
386
if(not add_argument(getplugin(NULL), p)){
352
if(not add_argument(getplugin(NULL, plugins), p)){
387
353
perror("add_argument");
388
354
return ARGP_ERR_UNKNOWN;
389
355
}
390
356
}
391
357
}
392
358
break;
393
case 'G': /* --global-env */
359
case 'e':
394
360
if(arg == NULL){
395
361
break;
396
362
}
397
if(not add_environment(getplugin(NULL), arg, true)){
398
perror("add_environment");
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
}
399
371
}
400
372
break;
401
case 'o': /* --options-for */
373
case 'o':
402
374
if (arg != NULL){
403
375
char *p_name = strsep(&arg, ":");
404
if(p_name[0] == '\0' or arg == NULL){
376
if(p_name[0] == '\0'){
405
377
break;
406
378
}
407
379
char *opt = strsep(&arg, ":");
408
if(opt[0] == '\0' or opt == NULL){
380
if(opt[0] == '\0'){
409
381
break;
410
382
}
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;
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
}
419
393
}
420
394
}
421
395
}
422
396
break;
423
case 'E': /* --env-for */
397
case 'f':
424
398
if(arg == NULL){
425
399
break;
426
400
}
429
403
if(envdef == NULL){
430
404
break;
431
405
}
432
*envdef = '\0';
433
if(not add_environment(getplugin(arg), envdef+1, true)){
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)){
434
412
perror("add_environment");
435
413
}
436
414
}
437
415
break;
438
case 'd': /* --disable */
416
case 'd':
439
417
if (arg != NULL){
440
plugin *p = getplugin(arg);
418
plugin *p = getplugin(arg, plugins);
441
419
if(p == NULL){
442
420
return ARGP_ERR_UNKNOWN;
443
421
}
444
422
p->disabled = true;
445
423
}
446
424
break;
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 */
425
case 128:
426
plugindir = arg;
427
break;
428
case 129:
467
429
uid = (uid_t)strtol(arg, NULL, 10);
468
430
break;
469
case 131: /* --groupid */
431
case 130:
470
432
gid = (gid_t)strtol(arg, NULL, 10);
471
433
break;
472
case 132: /* --debug */
434
case 131:
473
435
debug = true;
474
436
break;
475
437
case ARGP_KEY_ARG:
476
/* Cryptsetup always passes an argument, which is an empty
477
string if "none" was specified in /etc/crypttab. So if
478
argument was empty, we ignore it silently. */
479
if(arg[0] != '\0'){
480
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
481
}
482
break;
483
case ARGP_KEY_END:
484
break;
485
default:
486
return ARGP_ERR_UNKNOWN;
487
}
488
return 0;
489
}
490
491
/* This option parser is the same as parse_opt() above, except it
492
ignores everything but the --config-file option. */
493
error_t parse_opt_config_file (int key, char *arg,
494
__attribute__((unused))
495
struct argp_state *state) {
496
switch (key) {
497
case 'g': /* --global-options */
498
case 'G': /* --global-env */
499
case 'o': /* --options-for */
500
case 'E': /* --env-for */
501
case 'd': /* --disable */
502
case 'e': /* --enable */
503
case 128: /* --plugin-dir */
504
break;
505
case 129: /* --config-file */
506
free(argfile);
507
argfile = strdup(arg);
508
if(argfile == NULL){
509
perror("strdup");
510
}
511
break;
512
case 130: /* --userid */
513
case 131: /* --groupid */
514
case 132: /* --debug */
515
case ARGP_KEY_ARG:
516
case ARGP_KEY_END:
517
break;
518
default:
519
return ARGP_ERR_UNKNOWN;
520
}
521
return 0;
522
}
523
524
struct argp argp = { .options = options,
525
.parser = parse_opt_config_file,
526
.args_doc = "",
438
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
439
break;
440
case ARGP_KEY_END:
441
break;
442
default:
443
return ARGP_ERR_UNKNOWN;
444
}
445
return 0;
446
}
447
448
plugin *plugin_list = NULL;
449
450
struct argp argp = { .options = options, .parser = parse_opt,
451
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
527
452
.doc = "Mandos plugin runner -- Run plugins" };
528
453
529
/* Parse using the parse_opt_config_file in order to get the custom
530
config file location, if any. */
531
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
454
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
532
455
if (ret == ARGP_ERR_UNKNOWN){
533
456
fprintf(stderr, "Unknown error while parsing arguments\n");
534
457
exitstatus = EXIT_FAILURE;
535
458
goto fallback;
536
459
}
537
538
/* Reset to the normal argument parser */
539
argp.parser = parse_opt;
540
541
/* Open the configfile if available */
542
if (argfile == NULL){
543
conffp = fopen(AFILE, "r");
544
} else {
545
conffp = fopen(argfile, "r");
546
}
460
461
conffp = fopen(argfile, "r");
547
462
if(conffp != NULL){
548
463
char *org_line = NULL;
549
464
char *p, *arg, *new_arg, *line;
552
467
const char whitespace_delims[] = " \r\t\f\v\n";
553
468
const char comment_delim[] = "#";
554
469
555
custom_argc = 1;
556
custom_argv = malloc(sizeof(char*) * 2);
557
if(custom_argv == NULL){
558
perror("malloc");
559
exitstatus = EXIT_FAILURE;
560
goto fallback;
561
}
562
custom_argv[0] = argv[0];
563
custom_argv[1] = NULL;
564
565
/* for each line in the config file, strip whitespace and ignore
566
commented text */
567
470
while(true){
568
471
sret = getline(&org_line, &size, conffp);
569
472
if(sret == -1){
577
480
continue;
578
481
}
579
482
new_arg = strdup(p);
580
if(new_arg == NULL){
581
perror("strdup");
582
exitstatus = EXIT_FAILURE;
583
free(org_line);
584
goto fallback;
585
}
586
587
custom_argc += 1;
588
custom_argv = realloc(custom_argv, sizeof(char *)
589
* ((unsigned int) custom_argc + 1));
590
if(custom_argv == NULL){
591
perror("realloc");
592
exitstatus = EXIT_FAILURE;
593
free(org_line);
594
goto fallback;
595
}
596
custom_argv[custom_argc-1] = new_arg;
597
custom_argv[custom_argc] = NULL;
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
}
598
489
}
599
490
}
600
491
free(org_line);
601
} else {
492
} else{
602
493
/* Check for harmful errors and go to fallback. Other errors might
603
494
not affect opening plugins */
604
495
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
607
498
goto fallback;
608
499
}
609
500
}
610
/* If there was any arguments from configuration file,
611
pass them to parser as command arguments */
501
612
502
if(custom_argv != NULL){
613
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
614
0, NULL);
503
custom_argv[0] = argv[0];
504
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
615
505
if (ret == ARGP_ERR_UNKNOWN){
616
506
fprintf(stderr, "Unknown error while parsing arguments\n");
617
507
exitstatus = EXIT_FAILURE;
619
509
}
620
510
}
621
511
622
/* Parse actual command line arguments, to let them override the
623
config file */
624
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
625
if (ret == ARGP_ERR_UNKNOWN){
626
fprintf(stderr, "Unknown error while parsing arguments\n");
627
exitstatus = EXIT_FAILURE;
628
goto fallback;
629
}
630
631
512
if(debug){
632
513
for(plugin *p = plugin_list; p != NULL; p=p->next){
633
514
fprintf(stderr, "Plugin: %s has %d arguments\n",
642
523
}
643
524
}
644
525
645
/* Strip permissions down to nobody */
646
526
ret = setuid(uid);
647
527
if (ret == -1){
648
528
perror("setuid");
649
}
529
}
530
650
531
setgid(gid);
651
532
if (ret == -1){
652
533
perror("setgid");
653
534
}
654
535
655
if (plugindir == NULL){
656
dir = opendir(PDIR);
657
} else {
658
dir = opendir(plugindir);
659
}
660
536
dir = opendir(plugindir);
661
537
if(dir == NULL){
662
538
perror("Could not open plugin dir");
663
539
exitstatus = EXIT_FAILURE;
679
555
680
556
FD_ZERO(&rfds_all);
681
557
682
/* Read and execute any executable in the plugin directory*/
683
558
while(true){
684
559
dirst = readdir(dir);
685
560
686
/* All directory entries have been processed */
561
// All directory entries have been processed
687
562
if(dirst == NULL){
688
563
if (errno == EBADF){
689
564
perror("readdir");
695
570
696
571
d_name_len = strlen(dirst->d_name);
697
572
698
/* Ignore dotfiles, backup files and other junk */
573
// Ignore dotfiles, backup files and other junk
699
574
{
700
575
bool bad_name = false;
701
576
716
591
break;
717
592
}
718
593
}
594
719
595
if(bad_name){
720
596
continue;
721
597
}
598
722
599
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
723
600
size_t suf_len = strlen(*suf);
724
601
if((d_name_len >= suf_len)
739
616
}
740
617
741
618
char *filename;
742
if(plugindir == NULL){
743
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
744
} else {
745
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
746
}
619
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
747
620
if(ret < 0){
748
621
perror("asprintf");
749
622
continue;
755
628
free(filename);
756
629
continue;
757
630
}
758
759
/* Ignore non-executable files */
631
760
632
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
761
633
if(debug){
762
634
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
765
637
free(filename);
766
638
continue;
767
639
}
768
769
plugin *p = getplugin(dirst->d_name);
640
plugin *p = getplugin(dirst->d_name, &plugin_list);
770
641
if(p == NULL){
771
642
perror("getplugin");
772
643
free(filename);
782
653
}
783
654
{
784
655
/* Add global arguments to argument list for this plugin */
785
plugin *g = getplugin(NULL);
656
plugin *g = getplugin(NULL, &plugin_list);
786
657
if(g != NULL){
787
658
for(char **a = g->argv + 1; *a != NULL; a++){
788
659
if(not add_argument(p, *a)){
791
662
}
792
663
/* Add global environment variables */
793
664
for(char **e = g->environ; *e != NULL; e++){
794
if(not add_environment(p, *e, false)){
665
if(not add_environment(p, *e)){
795
666
perror("add_environment");
796
667
}
797
668
}
802
673
process, too. */
803
674
if(p->environ[0] != NULL){
804
675
for(char **e = environ; *e != NULL; e++){
805
if(not add_environment(p, *e, false)){
676
char *copy = strdup(*e);
677
if(copy == NULL){
678
perror("strdup");
679
continue;
680
}
681
if(not add_environment(p, copy)){
806
682
perror("add_environment");
807
683
}
808
684
}
815
691
exitstatus = EXIT_FAILURE;
816
692
goto fallback;
817
693
}
818
/* Ask OS to automatic close the pipe on exec */
819
694
ret = set_cloexec_flag(pipefd[0]);
820
695
if(ret < 0){
821
696
perror("set_cloexec_flag");
835
710
exitstatus = EXIT_FAILURE;
836
711
goto fallback;
837
712
}
838
/* Starting a new process to be watched */
713
// Starting a new process to be watched
839
714
pid_t pid = fork();
840
715
if(pid == -1){
841
716
perror("fork");
879
754
}
880
755
/* no return */
881
756
}
882
/* Parent process */
883
close(pipefd[1]); /* Close unused write end of pipe */
757
/* parent process */
884
758
free(filename);
885
plugin *new_plugin = getplugin(dirst->d_name);
886
if (new_plugin == NULL){
887
perror("getplugin");
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");
888
763
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
889
764
if(ret < 0){
890
perror("sigprocmask");
765
perror("sigprocmask");
891
766
}
892
767
exitstatus = EXIT_FAILURE;
893
768
goto fallback;
894
769
}
895
770
896
new_plugin->pid = pid;
897
new_plugin->fd = pipefd[0];
898
771
*new_process = (struct process){ .pid = pid,
772
.fd = pipefd[0],
773
.next = process_list };
774
// List handling
775
process_list = new_process;
899
776
/* Unblock SIGCHLD so signal handler can be run if this process
900
777
has already completed */
901
778
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
905
782
goto fallback;
906
783
}
907
784
908
FD_SET(new_plugin->fd, &rfds_all);
785
FD_SET(new_process->fd, &rfds_all);
909
786
910
if (maxfd < new_plugin->fd){
911
maxfd = new_plugin->fd;
787
if (maxfd < new_process->fd){
788
maxfd = new_process->fd;
912
789
}
913
790
914
791
}
915
792
793
free_plugin_list(plugin_list);
794
plugin_list = NULL;
795
916
796
closedir(dir);
917
797
dir = NULL;
918
919
for(plugin *p = plugin_list; p != NULL; p = p->next){
920
if(p->pid != 0){
921
break;
922
}
923
if(p->next == NULL){
924
fprintf(stderr, "No plugin processes started. Incorrect plugin"
925
" directory?\n");
926
free_plugin_list();
927
}
798
799
if (process_list == NULL){
800
fprintf(stderr, "No plugin processes started. Incorrect plugin"
801
" directory?\n");
802
process_list = NULL;
928
803
}
929
930
/* Main loop while running plugins exist */
931
while(plugin_list){
804
while(process_list){
932
805
fd_set rfds = rfds_all;
933
806
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
934
807
if (select_ret == -1){
938
811
}
939
812
/* OK, now either a process completed, or something can be read
940
813
from one of them */
941
for(plugin *proc = plugin_list; proc != NULL;){
814
for(process *proc = process_list; proc ; proc = proc->next){
942
815
/* Is this process completely done? */
943
816
if(proc->eof and proc->completed){
944
817
/* Only accept the plugin output if it exited cleanly */
945
818
if(not WIFEXITED(proc->status)
946
819
or WEXITSTATUS(proc->status) != 0){
947
820
/* Bad exit by plugin */
948
949
821
if(debug){
950
822
if(WIFEXITED(proc->status)){
951
823
fprintf(stderr, "Plugin %u exited with status %d\n",
960
832
(unsigned int) (proc->pid));
961
833
}
962
834
}
963
964
835
/* Remove the plugin */
965
836
FD_CLR(proc->fd, &rfds_all);
966
967
837
/* Block signal while modifying process_list */
968
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
838
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
969
839
if(ret < 0){
970
840
perror("sigprocmask");
971
841
exitstatus = EXIT_FAILURE;
972
842
goto fallback;
973
843
}
974
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
}
975
857
/* We are done modifying process list, so unblock signal */
976
858
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
977
859
NULL);
978
860
if(ret < 0){
979
861
perror("sigprocmask");
980
exitstatus = EXIT_FAILURE;
981
goto fallback;
982
}
983
984
if(plugin_list == NULL){
985
break;
986
}
987
988
plugin *next_plugin = proc->next;
989
free_plugin(proc);
990
proc = next_plugin;
991
continue;
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;
992
869
}
993
994
870
/* This process exited nicely, so print its buffer */
995
871
996
bool bret = print_out_password(proc->buffer,
997
proc->buffer_length);
872
bool bret = print_out_password(proc->buffer, proc->buffer_length);
998
873
if(not bret){
999
874
perror("print_out_password");
1000
875
exitstatus = EXIT_FAILURE;
1001
876
}
1002
877
goto fallback;
1003
878
}
1004
1005
879
/* This process has not completed. Does it have any output? */
1006
880
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1007
881
/* This process had nothing to say at this time */
1008
proc = proc->next;
1009
882
continue;
1010
883
}
1011
884
/* Before reading, make the process' data buffer large enough */
1024
897
BUFFER_SIZE);
1025
898
if(ret < 0){
1026
899
/* Read error from this process; ignore the error */
1027
proc = proc->next;
1028
900
continue;
1029
901
}
1030
902
if(ret == 0){
1039
911
1040
912
fallback:
1041
913
1042
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1043
/* Fallback if all plugins failed, none are found or an error
1044
occured */
914
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
915
/* Fallback if all plugins failed, none are found or an error occured */
1045
916
bool bret;
1046
917
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1047
918
char *passwordbuffer = getpass("Password: ");
1048
size_t len = strlen(passwordbuffer);
1049
/* Strip trailing newline */
1050
if(len > 0 and passwordbuffer[len-1] == '\n'){
1051
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1052
len--;
1053
}
1054
bret = print_out_password(passwordbuffer, len);
919
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1055
920
if(not bret){
1056
921
perror("print_out_password");
1057
922
exitstatus = EXIT_FAILURE;
1066
931
}
1067
932
1068
933
if(custom_argv != NULL){
1069
for(char **arg = custom_argv+1; *arg != NULL; arg++){
934
for(char **arg = custom_argv; *arg != NULL; arg++){
1070
935
free(*arg);
1071
936
}
1072
937
free(custom_argv);
1073
938
}
939
free_plugin_list(plugin_list);
1074
940
1075
941
if(dir != NULL){
1076
942
closedir(dir);
1077
943
}
1078
944
1079
945
/* Free the process list and kill the processes */
1080
for(plugin *p = plugin_list; p != NULL; p = p->next){
1081
if(p->pid != 0){
1082
close(p->fd);
1083
ret = kill(p->pid, SIGTERM);
1084
if(ret == -1 and errno != ESRCH){
1085
/* Set-uid proccesses might not get closed */
1086
perror("kill");
1087
}
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");
1088
953
}
954
free(process_list->buffer);
955
free(process_list);
1089
956
}
1090
957
1091
958
/* Wait for any remaining child processes to terminate */
1095
962
if(errno != ECHILD){
1096
963
perror("wait");
1097
964
}
1098
1099
free_plugin_list();
1100
1101
free(plugindir);
1102
free(argfile);
1103
965
1104
966
return exitstatus;
1105
967
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0