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- Committer: Teddy Hogeborn
- Date: 2008-09-02 13:04:42 UTC
- Revision ID: teddy@fukt.bsnet.se-20080902130442-ytnjsmllaph18e20
* plugin-runner.xml (PLUGINS/WRITING PLUGINS): New section.
(BUGS): Commented out. There are no bugs.
(EXAMPLE): Added lots of examples.
(SECURITY): Added text.
(SEE ALSO): Added "crypttab(5)" and "execve(2)".
(BUGS): Commented out. There are no bugs.
(EXAMPLE): Added lots of examples.
(SECURITY): Added text.
(SEE ALSO): Added "crypttab(5)" and "execve(2)".
- 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
*new_plugin = (plugin) { .name = name,
114
char *copy_name = NULL;
115
if(name != NULL){
116
copy_name = strdup(name);
117
if(copy_name == NULL){
118
return NULL;
119
}
120
}
121
122
*new_plugin = (plugin) { .name = copy_name,
109
123
.argc = 1,
110
.envc = 0,
111
124
.disabled = false,
112
.next = *plugin_list };
125
.next = plugin_list };
113
126
114
127
new_plugin->argv = malloc(sizeof(char *) * 2);
115
128
if (new_plugin->argv == NULL){
129
free(copy_name);
116
130
free(new_plugin);
117
131
return NULL;
118
132
}
119
new_plugin->argv[0] = name;
133
new_plugin->argv[0] = copy_name;
120
134
new_plugin->argv[1] = NULL;
121
135
122
136
new_plugin->environ = malloc(sizeof(char *));
123
137
if(new_plugin->environ == NULL){
138
free(copy_name);
124
139
free(new_plugin->argv);
125
140
free(new_plugin);
126
141
return NULL;
127
142
}
128
143
new_plugin->environ[0] = NULL;
144
129
145
/* Append the new plugin to the list */
130
*plugin_list = new_plugin;
146
plugin_list = new_plugin;
131
147
return new_plugin;
132
148
}
133
149
163
179
}
164
180
165
181
/* Add to a plugin's environment */
166
static bool add_environment(plugin *p, const char *def){
182
static bool add_environment(plugin *p, const char *def, bool replace){
167
183
if(p == NULL){
168
184
return false;
169
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
}
170
203
return add_to_char_array(def, &(p->environ), &(p->envc));
171
204
}
172
205
173
174
206
/*
175
207
* Based on the example in the GNU LibC manual chapter 13.13 "File
176
208
* Descriptor Flags".
187
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
188
220
}
189
221
190
process *process_list = NULL;
191
222
192
/* Mark a process as completed when it exits, and save its exit
223
/* Mark processes as completed when they exit, and save their exit
193
224
status. */
194
225
void handle_sigchld(__attribute__((unused)) int sig){
195
process *proc = process_list;
196
int status;
197
pid_t pid = wait(&status);
198
if(pid == -1){
199
perror("wait");
200
return;
201
}
202
while(proc != NULL and proc->pid != pid){
203
proc = proc->next;
204
}
205
if(proc == NULL){
206
/* Process not found in process list */
207
return;
208
}
209
proc->status = status;
210
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
}
211
253
}
212
254
255
/* Prints out a password to stdout */
213
256
bool print_out_password(const char *buffer, size_t length){
214
257
ssize_t ret;
215
258
if(length>0 and buffer[length-1] == '\n'){
225
268
return true;
226
269
}
227
270
228
char **add_to_argv(char **argv, int *argc, char *arg){
229
if (argv == NULL){
230
*argc = 1;
231
argv = malloc(sizeof(char*) * 2);
232
if(argv == NULL){
233
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
}
234
295
}
235
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
236
argv[1] = NULL;
237
}
238
*argc += 1;
239
argv = realloc(argv, sizeof(char *)
240
* ((unsigned int) *argc + 1));
241
if(argv == NULL){
242
return NULL;
243
}
244
argv[*argc-1] = arg;
245
argv[*argc] = NULL;
246
return argv;
296
}
297
298
free(plugin_node);
299
}
300
301
static void free_plugin_list(void){
302
while(plugin_list != NULL){
303
free_plugin(plugin_list);
304
}
247
305
}
248
306
249
307
int main(int argc, char *argv[]){
250
const char *plugindir = "/lib/mandos/plugins.d";
251
const char *argfile = ARGFILE;
308
char *plugindir = NULL;
309
char *argfile = NULL;
252
310
FILE *conffp;
253
311
size_t d_name_len;
254
312
DIR *dir = NULL;
269
327
/* Establish a signal handler */
270
328
sigemptyset(&sigchld_action.sa_mask);
271
329
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
272
if(ret < 0){
330
if(ret == -1){
273
331
perror("sigaddset");
274
exit(EXIT_FAILURE);
332
exitstatus = EXIT_FAILURE;
333
goto fallback;
275
334
}
276
335
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
277
if(ret < 0){
336
if(ret == -1){
278
337
perror("sigaction");
279
exit(EXIT_FAILURE);
338
exitstatus = EXIT_FAILURE;
339
goto fallback;
280
340
}
281
341
282
342
/* The options we understand. */
284
344
{ .name = "global-options", .key = 'g',
285
345
.arg = "OPTION[,OPTION[,...]]",
286
346
.doc = "Options passed to all plugins" },
287
{ .name = "global-envs", .key = 'e',
347
{ .name = "global-env", .key = 'G',
288
348
.arg = "VAR=value",
289
349
.doc = "Environment variable passed to all plugins" },
290
350
{ .name = "options-for", .key = 'o',
291
351
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
292
352
.doc = "Options passed only to specified plugin" },
293
{ .name = "envs-for", .key = 'f',
353
{ .name = "env-for", .key = 'E',
294
354
.arg = "PLUGIN:ENV=value",
295
355
.doc = "Environment variable passed to specified plugin" },
296
356
{ .name = "disable", .key = 'd',
297
357
.arg = "PLUGIN",
298
358
.doc = "Disable a specific plugin", .group = 1 },
359
{ .name = "enable", .key = 'e',
360
.arg = "PLUGIN",
361
.doc = "Enable a specific plugin", .group = 1 },
299
362
{ .name = "plugin-dir", .key = 128,
300
363
.arg = "DIRECTORY",
301
364
.doc = "Specify a different plugin directory", .group = 2 },
302
{ .name = "userid", .key = 129,
303
.arg = "ID", .flags = 0,
304
.doc = "User ID the plugins will run as", .group = 2 },
305
{ .name = "groupid", .key = 130,
306
.arg = "ID", .flags = 0,
307
.doc = "Group ID the plugins will run as", .group = 2 },
308
{ .name = "debug", .key = 131,
309
.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 },
310
376
{ .name = NULL }
311
377
};
312
378
313
error_t parse_opt (int key, char *arg, struct argp_state *state) {
314
/* Get the INPUT argument from `argp_parse', which we know is a
315
pointer to our plugin list pointer. */
316
plugin **plugins = state->input;
379
error_t parse_opt (int key, char *arg, __attribute__((unused))
380
struct argp_state *state) {
317
381
switch (key) {
318
case 'g':
382
case 'g': /* --global-options */
319
383
if (arg != NULL){
320
384
char *p;
321
385
while((p = strsep(&arg, ",")) != NULL){
322
386
if(p[0] == '\0'){
323
387
continue;
324
388
}
325
if(not add_argument(getplugin(NULL, plugins), p)){
389
if(not add_argument(getplugin(NULL), p)){
326
390
perror("add_argument");
327
391
return ARGP_ERR_UNKNOWN;
328
392
}
329
393
}
330
394
}
331
395
break;
332
case 'e':
396
case 'G': /* --global-env */
333
397
if(arg == NULL){
334
398
break;
335
399
}
338
402
if(envdef == NULL){
339
403
break;
340
404
}
341
if(not add_environment(getplugin(NULL, plugins), envdef)){
405
if(not add_environment(getplugin(NULL), envdef, true)){
342
406
perror("add_environment");
343
407
}
344
408
}
345
409
break;
346
case 'o':
410
case 'o': /* --options-for */
347
411
if (arg != NULL){
348
412
char *p_name = strsep(&arg, ":");
349
413
if(p_name[0] == '\0'){
359
423
if(p[0] == '\0'){
360
424
continue;
361
425
}
362
if(not add_argument(getplugin(p_name, plugins), p)){
426
if(not add_argument(getplugin(p_name), p)){
363
427
perror("add_argument");
364
428
return ARGP_ERR_UNKNOWN;
365
429
}
367
431
}
368
432
}
369
433
break;
370
case 'f':
434
case 'E': /* --env-for */
371
435
if(arg == NULL){
372
436
break;
373
437
}
381
445
break;
382
446
}
383
447
envdef++;
384
if(not add_environment(getplugin(p_name, plugins), envdef)){
448
if(not add_environment(getplugin(p_name), envdef, true)){
385
449
perror("add_environment");
386
450
}
387
451
}
388
452
break;
389
case 'd':
453
case 'd': /* --disable */
390
454
if (arg != NULL){
391
plugin *p = getplugin(arg, plugins);
455
plugin *p = getplugin(arg);
392
456
if(p == NULL){
393
457
return ARGP_ERR_UNKNOWN;
394
458
}
395
459
p->disabled = true;
396
460
}
397
461
break;
398
case 128:
399
plugindir = arg;
400
break;
401
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 */
402
481
uid = (uid_t)strtol(arg, NULL, 10);
403
482
break;
404
case 130:
483
case 131: /* --groupid */
405
484
gid = (gid_t)strtol(arg, NULL, 10);
406
485
break;
407
case 131:
486
case 132: /* --debug */
408
487
debug = true;
409
488
break;
410
489
case ARGP_KEY_ARG:
418
497
return 0;
419
498
}
420
499
421
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
}
422
531
423
struct argp argp = { .options = options, .parser = parse_opt,
424
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
532
struct argp argp = { .options = options,
533
.parser = parse_opt_config_file,
534
.args_doc = "",
425
535
.doc = "Mandos plugin runner -- Run plugins" };
426
536
427
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);
428
540
if (ret == ARGP_ERR_UNKNOWN){
429
541
fprintf(stderr, "Unknown error while parsing arguments\n");
430
542
exitstatus = EXIT_FAILURE;
431
goto end;
543
goto fallback;
432
544
}
433
434
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
}
435
555
if(conffp != NULL){
436
556
char *org_line = NULL;
557
char *p, *arg, *new_arg, *line;
437
558
size_t size = 0;
438
559
ssize_t sret;
439
char *p, *arg, *new_arg, *line;
440
560
const char whitespace_delims[] = " \r\t\f\v\n";
441
561
const char comment_delim[] = "#";
442
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 */
443
575
while(true){
444
576
sret = getline(&org_line, &size, conffp);
445
577
if(sret == -1){
453
585
continue;
454
586
}
455
587
new_arg = strdup(p);
456
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
457
if (custom_argv == NULL){
458
perror("add_to_argv");
459
exitstatus = EXIT_FAILURE;
460
goto end;
461
}
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;
462
606
}
463
607
}
464
608
free(org_line);
465
} else{
609
} else {
466
610
/* Check for harmful errors and go to fallback. Other errors might
467
611
not affect opening plugins */
468
612
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
469
613
perror("fopen");
470
614
exitstatus = EXIT_FAILURE;
471
goto end;
615
goto fallback;
472
616
}
473
617
}
474
618
/* If there was any arguments from configuration file,
619
pass them to parser as command arguments */
475
620
if(custom_argv != NULL){
476
custom_argv[0] = argv[0];
477
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);
478
623
if (ret == ARGP_ERR_UNKNOWN){
479
624
fprintf(stderr, "Unknown error while parsing arguments\n");
480
625
exitstatus = EXIT_FAILURE;
481
goto end;
626
goto fallback;
482
627
}
483
628
}
484
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
485
639
if(debug){
486
640
for(plugin *p = plugin_list; p != NULL; p=p->next){
487
641
fprintf(stderr, "Plugin: %s has %d arguments\n",
496
650
}
497
651
}
498
652
653
/* Strip permissions down to nobody */
499
654
ret = setuid(uid);
500
655
if (ret == -1){
501
656
perror("setuid");
502
}
503
657
}
504
658
setgid(gid);
505
659
if (ret == -1){
506
660
perror("setgid");
507
661
}
508
662
509
dir = opendir(plugindir);
663
if (plugindir == NULL){
664
dir = opendir(PDIR);
665
} else {
666
dir = opendir(plugindir);
667
}
668
510
669
if(dir == NULL){
511
670
perror("Could not open plugin dir");
512
671
exitstatus = EXIT_FAILURE;
513
goto end;
672
goto fallback;
514
673
}
515
674
516
675
/* Set the FD_CLOEXEC flag on the directory, if possible */
521
680
if(ret < 0){
522
681
perror("set_cloexec_flag");
523
682
exitstatus = EXIT_FAILURE;
524
goto end;
683
goto fallback;
525
684
}
526
685
}
527
686
}
528
687
529
688
FD_ZERO(&rfds_all);
530
689
690
/* Read and execute any executable in the plugin directory*/
531
691
while(true){
532
692
dirst = readdir(dir);
533
693
534
// All directory entries have been processed
694
/* All directory entries have been processed */
535
695
if(dirst == NULL){
536
696
if (errno == EBADF){
537
697
perror("readdir");
538
698
exitstatus = EXIT_FAILURE;
539
goto end;
699
goto fallback;
540
700
}
541
701
break;
542
702
}
543
703
544
704
d_name_len = strlen(dirst->d_name);
545
705
546
// Ignore dotfiles, backup files and other junk
706
/* Ignore dotfiles, backup files and other junk */
547
707
{
548
708
bool bad_name = false;
549
709
564
724
break;
565
725
}
566
726
}
567
568
727
if(bad_name){
569
728
continue;
570
729
}
571
572
730
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
573
731
size_t suf_len = strlen(*suf);
574
732
if((d_name_len >= suf_len)
601
759
free(filename);
602
760
continue;
603
761
}
604
762
763
/* Ignore non-executable files */
605
764
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
606
765
if(debug){
607
766
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
610
769
free(filename);
611
770
continue;
612
771
}
613
plugin *p = getplugin(dirst->d_name, &plugin_list);
772
773
plugin *p = getplugin(dirst->d_name);
614
774
if(p == NULL){
615
775
perror("getplugin");
616
776
free(filename);
626
786
}
627
787
{
628
788
/* Add global arguments to argument list for this plugin */
629
plugin *g = getplugin(NULL, &plugin_list);
789
plugin *g = getplugin(NULL);
630
790
if(g != NULL){
631
791
for(char **a = g->argv + 1; *a != NULL; a++){
632
792
if(not add_argument(p, *a)){
635
795
}
636
796
/* Add global environment variables */
637
797
for(char **e = g->environ; *e != NULL; e++){
638
if(not add_environment(p, *e)){
798
if(not add_environment(p, *e, false)){
639
799
perror("add_environment");
640
800
}
641
801
}
646
806
process, too. */
647
807
if(p->environ[0] != NULL){
648
808
for(char **e = environ; *e != NULL; e++){
649
char *copy = strdup(*e);
650
if(copy == NULL){
651
perror("strdup");
652
continue;
653
}
654
if(not add_environment(p, copy)){
809
if(not add_environment(p, *e, false)){
655
810
perror("add_environment");
656
811
}
657
812
}
658
813
}
659
814
660
int pipefd[2];
815
int pipefd[2];
661
816
ret = pipe(pipefd);
662
817
if (ret == -1){
663
818
perror("pipe");
664
819
exitstatus = EXIT_FAILURE;
665
goto end;
820
goto fallback;
666
821
}
822
/* Ask OS to automatic close the pipe on exec */
667
823
ret = set_cloexec_flag(pipefd[0]);
668
824
if(ret < 0){
669
825
perror("set_cloexec_flag");
670
826
exitstatus = EXIT_FAILURE;
671
goto end;
827
goto fallback;
672
828
}
673
829
ret = set_cloexec_flag(pipefd[1]);
674
830
if(ret < 0){
675
831
perror("set_cloexec_flag");
676
832
exitstatus = EXIT_FAILURE;
677
goto end;
833
goto fallback;
678
834
}
679
835
/* Block SIGCHLD until process is safely in process list */
680
836
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
681
837
if(ret < 0){
682
838
perror("sigprocmask");
683
839
exitstatus = EXIT_FAILURE;
684
goto end;
840
goto fallback;
685
841
}
686
// Starting a new process to be watched
842
/* Starting a new process to be watched */
687
843
pid_t pid = fork();
688
844
if(pid == -1){
689
845
perror("fork");
690
846
exitstatus = EXIT_FAILURE;
691
goto end;
847
goto fallback;
692
848
}
693
849
if(pid == 0){
694
850
/* this is the child process */
727
883
}
728
884
/* no return */
729
885
}
730
/* parent process */
886
/* Parent process */
887
close(pipefd[1]); /* Close unused write end of pipe */
731
888
free(filename);
732
close(pipefd[1]); /* close unused write end of pipe */
733
process *new_process = malloc(sizeof(process));
734
if (new_process == NULL){
735
perror("malloc");
889
plugin *new_plugin = getplugin(dirst->d_name);
890
if (new_plugin == NULL){
891
perror("getplugin");
736
892
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
737
893
if(ret < 0){
738
perror("sigprocmask");
894
perror("sigprocmask");
739
895
}
740
896
exitstatus = EXIT_FAILURE;
741
goto end;
897
goto fallback;
742
898
}
743
899
744
*new_process = (struct process){ .pid = pid,
745
.fd = pipefd[0],
746
.next = process_list };
747
// List handling
748
process_list = new_process;
900
new_plugin->pid = pid;
901
new_plugin->fd = pipefd[0];
902
749
903
/* Unblock SIGCHLD so signal handler can be run if this process
750
904
has already completed */
751
905
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
752
906
if(ret < 0){
753
907
perror("sigprocmask");
754
908
exitstatus = EXIT_FAILURE;
755
goto end;
756
}
757
758
FD_SET(new_process->fd, &rfds_all);
759
760
if (maxfd < new_process->fd){
761
maxfd = new_process->fd;
762
}
763
764
}
765
766
/* Free the plugin list */
767
for(plugin *next; plugin_list != NULL; plugin_list = next){
768
next = plugin_list->next;
769
free(plugin_list->argv);
770
if(plugin_list->environ[0] != NULL){
771
for(char **e = plugin_list->environ; *e != NULL; e++){
772
free(*e);
773
}
774
}
775
free(plugin_list);
909
goto fallback;
910
}
911
912
FD_SET(new_plugin->fd, &rfds_all);
913
914
if (maxfd < new_plugin->fd){
915
maxfd = new_plugin->fd;
916
}
917
776
918
}
777
919
778
920
closedir(dir);
779
921
dir = NULL;
780
781
if (process_list == NULL){
782
fprintf(stderr, "No plugin processes started. Incorrect plugin"
783
" directory?\n");
784
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
}
785
932
}
786
while(process_list){
933
934
/* Main loop while running plugins exist */
935
while(plugin_list){
787
936
fd_set rfds = rfds_all;
788
937
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
789
938
if (select_ret == -1){
790
939
perror("select");
791
940
exitstatus = EXIT_FAILURE;
792
goto end;
941
goto fallback;
793
942
}
794
943
/* OK, now either a process completed, or something can be read
795
944
from one of them */
796
for(process *proc = process_list; proc ; proc = proc->next){
945
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
797
946
/* Is this process completely done? */
798
947
if(proc->eof and proc->completed){
799
948
/* Only accept the plugin output if it exited cleanly */
800
949
if(not WIFEXITED(proc->status)
801
950
or WEXITSTATUS(proc->status) != 0){
802
951
/* Bad exit by plugin */
952
803
953
if(debug){
804
954
if(WIFEXITED(proc->status)){
805
955
fprintf(stderr, "Plugin %u exited with status %d\n",
814
964
(unsigned int) (proc->pid));
815
965
}
816
966
}
967
817
968
/* Remove the plugin */
818
969
FD_CLR(proc->fd, &rfds_all);
970
819
971
/* Block signal while modifying process_list */
820
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
972
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
821
973
if(ret < 0){
822
974
perror("sigprocmask");
823
975
exitstatus = EXIT_FAILURE;
824
goto end;
825
}
826
/* Delete this process entry from the list */
827
if(process_list == proc){
828
/* First one - simple */
829
process_list = proc->next;
830
} else {
831
/* Second one or later */
832
for(process *p = process_list; p != NULL; p = p->next){
833
if(p->next == proc){
834
p->next = proc->next;
835
break;
836
}
837
}
838
}
976
goto fallback;
977
}
978
free_plugin(proc);
839
979
/* We are done modifying process list, so unblock signal */
840
980
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
841
981
NULL);
842
982
if(ret < 0){
843
983
perror("sigprocmask");
844
}
845
free(proc->buffer);
846
free(proc);
847
/* We deleted this process from the list, so we can't go
848
proc->next. Therefore, start over from the beginning of
849
the process list */
850
break;
984
exitstatus = EXIT_FAILURE;
985
goto fallback;
986
}
987
988
if(plugin_list == NULL){
989
break;
990
}
991
continue;
851
992
}
993
852
994
/* This process exited nicely, so print its buffer */
853
995
854
bool bret = print_out_password(proc->buffer, proc->buffer_length);
996
bool bret = print_out_password(proc->buffer,
997
proc->buffer_length);
855
998
if(not bret){
856
999
perror("print_out_password");
857
1000
exitstatus = EXIT_FAILURE;
858
1001
}
859
goto end;
1002
goto fallback;
860
1003
}
1004
861
1005
/* This process has not completed. Does it have any output? */
862
1006
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
863
1007
/* This process had nothing to say at this time */
870
1014
if (proc->buffer == NULL){
871
1015
perror("malloc");
872
1016
exitstatus = EXIT_FAILURE;
873
goto end;
1017
goto fallback;
874
1018
}
875
1019
proc->buffer_size += BUFFER_SIZE;
876
1020
}
891
1035
}
892
1036
893
1037
894
end:
1038
fallback:
895
1039
896
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
897
/* 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 */
898
1043
bool bret;
899
1044
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
900
1045
char *passwordbuffer = getpass("Password: ");
902
1047
if(not bret){
903
1048
perror("print_out_password");
904
1049
exitstatus = EXIT_FAILURE;
905
goto end;
906
1050
}
907
1051
}
908
1052
909
1053
/* Restore old signal handler */
910
sigaction(SIGCHLD, &old_sigchld_action, NULL);
911
912
free(custom_argv);
913
914
/* Free the plugin list */
915
for(plugin *next; plugin_list != NULL; plugin_list = next){
916
next = plugin_list->next;
917
free(plugin_list->argv);
918
if(plugin_list->environ[0] != NULL){
919
for(char **e = plugin_list->environ; *e != NULL; e++){
920
free(*e);
921
}
1054
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1055
if(ret == -1){
1056
perror("sigaction");
1057
exitstatus = EXIT_FAILURE;
1058
}
1059
1060
if(custom_argv != NULL){
1061
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1062
free(*arg);
922
1063
}
923
free(plugin_list->environ);
924
free(plugin_list);
1064
free(custom_argv);
925
1065
}
926
1066
927
1067
if(dir != NULL){
929
1069
}
930
1070
931
1071
/* Free the process list and kill the processes */
932
for(process *next; process_list != NULL; process_list = next){
933
next = process_list->next;
934
close(process_list->fd);
935
ret = kill(process_list->pid, SIGTERM);
936
if(ret == -1 and errno != ESRCH){
937
/* set-uid proccesses migth not get closed */
938
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
}
939
1080
}
940
free(process_list->buffer);
941
free(process_list);
942
1081
}
943
1082
944
1083
/* Wait for any remaining child processes to terminate */
948
1087
if(errno != ECHILD){
949
1088
perror("wait");
950
1089
}
1090
1091
free_plugin_list();
1092
1093
free(plugindir);
1094
free(argfile);
951
1095
952
1096
return exitstatus;
953
1097
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0