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- Committer: Teddy Hogeborn
- Date: 2008-08-16 16:58:31 UTC
- Revision ID: teddy@fukt.bsnet.se-20080816165831-cx018vo5i9oqmgo0
* plugins.d/password-request.c (main): Include environment variables
"cryptsource" and "crypttarget"
in password prompt.
"cryptsource" and "crypttarget"
in password prompt.
- files added:
- network-protocol.txt
- files removed:
- .bzrignore
- 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;
111
105
if (new_plugin == NULL){
112
106
return NULL;
113
107
}
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,
108
*new_plugin = (plugin) { .name = name,
123
109
.argc = 1,
110
.envc = 0,
124
111
.disabled = false,
125
.next = plugin_list };
112
.next = *plugin_list };
126
113
127
114
new_plugin->argv = malloc(sizeof(char *) * 2);
128
115
if (new_plugin->argv == NULL){
129
free(copy_name);
130
116
free(new_plugin);
131
117
return NULL;
132
118
}
133
new_plugin->argv[0] = copy_name;
119
new_plugin->argv[0] = name;
134
120
new_plugin->argv[1] = NULL;
135
121
136
122
new_plugin->environ = malloc(sizeof(char *));
137
123
if(new_plugin->environ == NULL){
138
free(copy_name);
139
124
free(new_plugin->argv);
140
125
free(new_plugin);
141
126
return NULL;
142
127
}
143
128
new_plugin->environ[0] = NULL;
144
145
129
/* Append the new plugin to the list */
146
plugin_list = new_plugin;
130
*plugin_list = new_plugin;
147
131
return new_plugin;
148
132
}
149
133
179
163
}
180
164
181
165
/* Add to a plugin's environment */
182
static bool add_environment(plugin *p, const char *def, bool replace){
166
static bool add_environment(plugin *p, const char *def){
183
167
if(p == NULL){
184
168
return false;
185
169
}
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
170
return add_to_char_array(def, &(p->environ), &(p->envc));
204
171
}
205
172
173
206
174
/*
207
175
* Based on the example in the GNU LibC manual chapter 13.13 "File
208
176
* Descriptor Flags".
219
187
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
220
188
}
221
189
190
process *process_list = NULL;
222
191
223
/* Mark processes as completed when they exit, and save their exit
192
/* Mark a process as completed when it exits, and save its exit
224
193
status. */
225
194
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
}
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;
253
211
}
254
212
255
/* Prints out a password to stdout */
256
213
bool print_out_password(const char *buffer, size_t length){
257
214
ssize_t ret;
258
215
if(length>0 and buffer[length-1] == '\n'){
268
225
return true;
269
226
}
270
227
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
}
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;
295
234
}
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
}
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;
305
247
}
306
248
307
249
int main(int argc, char *argv[]){
308
char *plugindir = NULL;
309
char *argfile = NULL;
250
const char *plugindir = "/lib/mandos/plugins.d";
251
const char *argfile = ARGFILE;
310
252
FILE *conffp;
311
253
size_t d_name_len;
312
254
DIR *dir = NULL;
327
269
/* Establish a signal handler */
328
270
sigemptyset(&sigchld_action.sa_mask);
329
271
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
330
if(ret == -1){
272
if(ret < 0){
331
273
perror("sigaddset");
332
exitstatus = EXIT_FAILURE;
333
goto fallback;
274
exit(EXIT_FAILURE);
334
275
}
335
276
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
336
if(ret == -1){
277
if(ret < 0){
337
278
perror("sigaction");
338
exitstatus = EXIT_FAILURE;
339
goto fallback;
279
exit(EXIT_FAILURE);
340
280
}
341
281
342
282
/* The options we understand. */
344
284
{ .name = "global-options", .key = 'g',
345
285
.arg = "OPTION[,OPTION[,...]]",
346
286
.doc = "Options passed to all plugins" },
347
{ .name = "global-env", .key = 'G',
287
{ .name = "global-envs", .key = 'e',
348
288
.arg = "VAR=value",
349
289
.doc = "Environment variable passed to all plugins" },
350
290
{ .name = "options-for", .key = 'o',
351
291
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
352
292
.doc = "Options passed only to specified plugin" },
353
{ .name = "env-for", .key = 'E',
293
{ .name = "envs-for", .key = 'f',
354
294
.arg = "PLUGIN:ENV=value",
355
295
.doc = "Environment variable passed to specified plugin" },
356
296
{ .name = "disable", .key = 'd',
357
297
.arg = "PLUGIN",
358
298
.doc = "Disable a specific plugin", .group = 1 },
359
{ .name = "enable", .key = 'e',
360
.arg = "PLUGIN",
361
.doc = "Enable a specific plugin", .group = 1 },
362
299
{ .name = "plugin-dir", .key = 128,
363
300
.arg = "DIRECTORY",
364
301
.doc = "Specify a different plugin directory", .group = 2 },
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 },
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 },
376
310
{ .name = NULL }
377
311
};
378
312
379
error_t parse_opt (int key, char *arg, __attribute__((unused))
380
struct argp_state *state) {
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;
381
317
switch (key) {
382
case 'g': /* --global-options */
318
case 'g':
383
319
if (arg != NULL){
384
320
char *p;
385
321
while((p = strsep(&arg, ",")) != NULL){
386
322
if(p[0] == '\0'){
387
323
continue;
388
324
}
389
if(not add_argument(getplugin(NULL), p)){
325
if(not add_argument(getplugin(NULL, plugins), p)){
390
326
perror("add_argument");
391
327
return ARGP_ERR_UNKNOWN;
392
328
}
393
329
}
394
330
}
395
331
break;
396
case 'G': /* --global-env */
332
case 'e':
397
333
if(arg == NULL){
398
334
break;
399
335
}
402
338
if(envdef == NULL){
403
339
break;
404
340
}
405
if(not add_environment(getplugin(NULL), envdef, true)){
341
if(not add_environment(getplugin(NULL, plugins), envdef)){
406
342
perror("add_environment");
407
343
}
408
344
}
409
345
break;
410
case 'o': /* --options-for */
346
case 'o':
411
347
if (arg != NULL){
412
348
char *p_name = strsep(&arg, ":");
413
if(p_name[0] == '\0' or arg == NULL){
349
if(p_name[0] == '\0'){
414
350
break;
415
351
}
416
352
char *opt = strsep(&arg, ":");
417
if(opt[0] == '\0' or opt == NULL){
353
if(opt[0] == '\0'){
418
354
break;
419
355
}
420
char *p;
421
while((p = strsep(&opt, ",")) != NULL){
422
if(p[0] == '\0'){
423
continue;
424
}
425
if(not add_argument(getplugin(p_name), p)){
426
perror("add_argument");
427
return ARGP_ERR_UNKNOWN;
356
if(opt != NULL){
357
char *p;
358
while((p = strsep(&opt, ",")) != NULL){
359
if(p[0] == '\0'){
360
continue;
361
}
362
if(not add_argument(getplugin(p_name, plugins), p)){
363
perror("add_argument");
364
return ARGP_ERR_UNKNOWN;
365
}
428
366
}
429
367
}
430
368
}
431
369
break;
432
case 'E': /* --env-for */
370
case 'f':
433
371
if(arg == NULL){
434
372
break;
435
373
}
443
381
break;
444
382
}
445
383
envdef++;
446
if(not add_environment(getplugin(p_name), envdef, true)){
384
if(not add_environment(getplugin(p_name, plugins), envdef)){
447
385
perror("add_environment");
448
386
}
449
387
}
450
388
break;
451
case 'd': /* --disable */
389
case 'd':
452
390
if (arg != NULL){
453
plugin *p = getplugin(arg);
391
plugin *p = getplugin(arg, plugins);
454
392
if(p == NULL){
455
393
return ARGP_ERR_UNKNOWN;
456
394
}
457
395
p->disabled = true;
458
396
}
459
397
break;
460
case 'e': /* --enable */
461
if (arg != NULL){
462
plugin *p = getplugin(arg);
463
if(p == NULL){
464
return ARGP_ERR_UNKNOWN;
465
}
466
p->disabled = false;
467
}
468
break;
469
case 128: /* --plugin-dir */
470
plugindir = strdup(arg);
471
if(plugindir == NULL){
472
perror("strdup");
473
}
474
break;
475
case 129: /* --config-file */
476
/* This is already done by parse_opt_config_file() */
477
break;
478
case 130: /* --userid */
398
case 128:
399
plugindir = arg;
400
break;
401
case 129:
479
402
uid = (uid_t)strtol(arg, NULL, 10);
480
403
break;
481
case 131: /* --groupid */
404
case 130:
482
405
gid = (gid_t)strtol(arg, NULL, 10);
483
406
break;
484
case 132: /* --debug */
407
case 131:
485
408
debug = true;
486
409
break;
487
410
case ARGP_KEY_ARG:
495
418
return 0;
496
419
}
497
420
498
/* This option parser is the same as parse_opt() above, except it
499
ignores everything but the --config-file option. */
500
error_t parse_opt_config_file (int key, char *arg,
501
__attribute__((unused))
502
struct argp_state *state) {
503
switch (key) {
504
case 'g': /* --global-options */
505
case 'G': /* --global-env */
506
case 'o': /* --options-for */
507
case 'E': /* --env-for */
508
case 'd': /* --disable */
509
case 'e': /* --enable */
510
case 128: /* --plugin-dir */
511
break;
512
case 129: /* --config-file */
513
argfile = strdup(arg);
514
if(argfile == NULL){
515
perror("strdup");
516
}
517
break;
518
case 130: /* --userid */
519
case 131: /* --groupid */
520
case 132: /* --debug */
521
case ARGP_KEY_ARG:
522
case ARGP_KEY_END:
523
break;
524
default:
525
return ARGP_ERR_UNKNOWN;
526
}
527
return 0;
528
}
421
plugin *plugin_list = NULL;
529
422
530
struct argp argp = { .options = options,
531
.parser = parse_opt_config_file,
532
.args_doc = "",
423
struct argp argp = { .options = options, .parser = parse_opt,
424
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
533
425
.doc = "Mandos plugin runner -- Run plugins" };
534
426
535
/* Parse using the parse_opt_config_file in order to get the custom
536
config file location, if any. */
537
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
427
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
538
428
if (ret == ARGP_ERR_UNKNOWN){
539
429
fprintf(stderr, "Unknown error while parsing arguments\n");
540
430
exitstatus = EXIT_FAILURE;
541
goto fallback;
431
goto end;
542
432
}
543
544
/* Reset to the normal argument parser */
545
argp.parser = parse_opt;
546
547
/* Open the configfile if available */
548
if (argfile == NULL){
549
conffp = fopen(AFILE, "r");
550
} else {
551
conffp = fopen(argfile, "r");
552
}
433
434
conffp = fopen(argfile, "r");
553
435
if(conffp != NULL){
554
436
char *org_line = NULL;
555
char *p, *arg, *new_arg, *line;
556
437
size_t size = 0;
557
438
ssize_t sret;
439
char *p, *arg, *new_arg, *line;
558
440
const char whitespace_delims[] = " \r\t\f\v\n";
559
441
const char comment_delim[] = "#";
560
442
561
custom_argc = 1;
562
custom_argv = malloc(sizeof(char*) * 2);
563
if(custom_argv == NULL){
564
perror("malloc");
565
exitstatus = EXIT_FAILURE;
566
goto fallback;
567
}
568
custom_argv[0] = argv[0];
569
custom_argv[1] = NULL;
570
571
/* for each line in the config file, strip whitespace and ignore
572
commented text */
573
443
while(true){
574
444
sret = getline(&org_line, &size, conffp);
575
445
if(sret == -1){
583
453
continue;
584
454
}
585
455
new_arg = strdup(p);
586
if(new_arg == NULL){
587
perror("strdup");
588
exitstatus = EXIT_FAILURE;
589
free(org_line);
590
goto fallback;
591
}
592
593
custom_argc += 1;
594
custom_argv = realloc(custom_argv, sizeof(char *)
595
* ((unsigned int) custom_argc + 1));
596
if(custom_argv == NULL){
597
perror("realloc");
598
exitstatus = EXIT_FAILURE;
599
free(org_line);
600
goto fallback;
601
}
602
custom_argv[custom_argc-1] = new_arg;
603
custom_argv[custom_argc] = NULL;
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
}
604
462
}
605
463
}
606
464
free(org_line);
607
} else {
465
} else{
608
466
/* Check for harmful errors and go to fallback. Other errors might
609
467
not affect opening plugins */
610
468
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
611
469
perror("fopen");
612
470
exitstatus = EXIT_FAILURE;
613
goto fallback;
471
goto end;
614
472
}
615
473
}
616
/* If there was any arguments from configuration file,
617
pass them to parser as command arguments */
474
618
475
if(custom_argv != NULL){
619
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
620
0, NULL);
476
custom_argv[0] = argv[0];
477
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
621
478
if (ret == ARGP_ERR_UNKNOWN){
622
479
fprintf(stderr, "Unknown error while parsing arguments\n");
623
480
exitstatus = EXIT_FAILURE;
624
goto fallback;
481
goto end;
625
482
}
626
483
}
627
484
628
/* Parse actual command line arguments, to let them override the
629
config file */
630
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
631
if (ret == ARGP_ERR_UNKNOWN){
632
fprintf(stderr, "Unknown error while parsing arguments\n");
633
exitstatus = EXIT_FAILURE;
634
goto fallback;
635
}
636
637
485
if(debug){
638
486
for(plugin *p = plugin_list; p != NULL; p=p->next){
639
487
fprintf(stderr, "Plugin: %s has %d arguments\n",
648
496
}
649
497
}
650
498
651
/* Strip permissions down to nobody */
652
499
ret = setuid(uid);
653
500
if (ret == -1){
654
501
perror("setuid");
655
}
502
}
503
656
504
setgid(gid);
657
505
if (ret == -1){
658
506
perror("setgid");
659
507
}
660
508
661
if (plugindir == NULL){
662
dir = opendir(PDIR);
663
} else {
664
dir = opendir(plugindir);
665
}
666
509
dir = opendir(plugindir);
667
510
if(dir == NULL){
668
511
perror("Could not open plugin dir");
669
512
exitstatus = EXIT_FAILURE;
670
goto fallback;
513
goto end;
671
514
}
672
515
673
516
/* Set the FD_CLOEXEC flag on the directory, if possible */
678
521
if(ret < 0){
679
522
perror("set_cloexec_flag");
680
523
exitstatus = EXIT_FAILURE;
681
goto fallback;
524
goto end;
682
525
}
683
526
}
684
527
}
685
528
686
529
FD_ZERO(&rfds_all);
687
530
688
/* Read and execute any executable in the plugin directory*/
689
531
while(true){
690
532
dirst = readdir(dir);
691
533
692
/* All directory entries have been processed */
534
// All directory entries have been processed
693
535
if(dirst == NULL){
694
536
if (errno == EBADF){
695
537
perror("readdir");
696
538
exitstatus = EXIT_FAILURE;
697
goto fallback;
539
goto end;
698
540
}
699
541
break;
700
542
}
701
543
702
544
d_name_len = strlen(dirst->d_name);
703
545
704
/* Ignore dotfiles, backup files and other junk */
546
// Ignore dotfiles, backup files and other junk
705
547
{
706
548
bool bad_name = false;
707
549
722
564
break;
723
565
}
724
566
}
567
725
568
if(bad_name){
726
569
continue;
727
570
}
571
728
572
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
729
573
size_t suf_len = strlen(*suf);
730
574
if((d_name_len >= suf_len)
757
601
free(filename);
758
602
continue;
759
603
}
760
761
/* Ignore non-executable files */
604
762
605
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
763
606
if(debug){
764
607
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
767
610
free(filename);
768
611
continue;
769
612
}
770
771
plugin *p = getplugin(dirst->d_name);
613
plugin *p = getplugin(dirst->d_name, &plugin_list);
772
614
if(p == NULL){
773
615
perror("getplugin");
774
616
free(filename);
784
626
}
785
627
{
786
628
/* Add global arguments to argument list for this plugin */
787
plugin *g = getplugin(NULL);
629
plugin *g = getplugin(NULL, &plugin_list);
788
630
if(g != NULL){
789
631
for(char **a = g->argv + 1; *a != NULL; a++){
790
632
if(not add_argument(p, *a)){
793
635
}
794
636
/* Add global environment variables */
795
637
for(char **e = g->environ; *e != NULL; e++){
796
if(not add_environment(p, *e, false)){
638
if(not add_environment(p, *e)){
797
639
perror("add_environment");
798
640
}
799
641
}
804
646
process, too. */
805
647
if(p->environ[0] != NULL){
806
648
for(char **e = environ; *e != NULL; e++){
807
if(not add_environment(p, *e, false)){
649
char *copy = strdup(*e);
650
if(copy == NULL){
651
perror("strdup");
652
continue;
653
}
654
if(not add_environment(p, copy)){
808
655
perror("add_environment");
809
656
}
810
657
}
811
658
}
812
659
813
int pipefd[2];
660
int pipefd[2];
814
661
ret = pipe(pipefd);
815
662
if (ret == -1){
816
663
perror("pipe");
817
664
exitstatus = EXIT_FAILURE;
818
goto fallback;
665
goto end;
819
666
}
820
/* Ask OS to automatic close the pipe on exec */
821
667
ret = set_cloexec_flag(pipefd[0]);
822
668
if(ret < 0){
823
669
perror("set_cloexec_flag");
824
670
exitstatus = EXIT_FAILURE;
825
goto fallback;
671
goto end;
826
672
}
827
673
ret = set_cloexec_flag(pipefd[1]);
828
674
if(ret < 0){
829
675
perror("set_cloexec_flag");
830
676
exitstatus = EXIT_FAILURE;
831
goto fallback;
677
goto end;
832
678
}
833
679
/* Block SIGCHLD until process is safely in process list */
834
680
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
835
681
if(ret < 0){
836
682
perror("sigprocmask");
837
683
exitstatus = EXIT_FAILURE;
838
goto fallback;
684
goto end;
839
685
}
840
/* Starting a new process to be watched */
686
// Starting a new process to be watched
841
687
pid_t pid = fork();
842
688
if(pid == -1){
843
689
perror("fork");
844
690
exitstatus = EXIT_FAILURE;
845
goto fallback;
691
goto end;
846
692
}
847
693
if(pid == 0){
848
694
/* this is the child process */
881
727
}
882
728
/* no return */
883
729
}
884
/* Parent process */
885
close(pipefd[1]); /* Close unused write end of pipe */
730
/* parent process */
886
731
free(filename);
887
plugin *new_plugin = getplugin(dirst->d_name);
888
if (new_plugin == NULL){
889
perror("getplugin");
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");
890
736
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
891
737
if(ret < 0){
892
perror("sigprocmask");
738
perror("sigprocmask");
893
739
}
894
740
exitstatus = EXIT_FAILURE;
895
goto fallback;
741
goto end;
896
742
}
897
743
898
new_plugin->pid = pid;
899
new_plugin->fd = pipefd[0];
900
744
*new_process = (struct process){ .pid = pid,
745
.fd = pipefd[0],
746
.next = process_list };
747
// List handling
748
process_list = new_process;
901
749
/* Unblock SIGCHLD so signal handler can be run if this process
902
750
has already completed */
903
751
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
904
752
if(ret < 0){
905
753
perror("sigprocmask");
906
754
exitstatus = EXIT_FAILURE;
907
goto fallback;
908
}
909
910
FD_SET(new_plugin->fd, &rfds_all);
911
912
if (maxfd < new_plugin->fd){
913
maxfd = new_plugin->fd;
914
}
915
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);
916
776
}
917
777
918
778
closedir(dir);
919
779
dir = NULL;
920
921
for(plugin *p = plugin_list; p != NULL; p = p->next){
922
if(p->pid != 0){
923
break;
924
}
925
if(p->next == NULL){
926
fprintf(stderr, "No plugin processes started. Incorrect plugin"
927
" directory?\n");
928
free_plugin_list();
929
}
780
781
if (process_list == NULL){
782
fprintf(stderr, "No plugin processes started. Incorrect plugin"
783
" directory?\n");
784
process_list = NULL;
930
785
}
931
932
/* Main loop while running plugins exist */
933
while(plugin_list){
786
while(process_list){
934
787
fd_set rfds = rfds_all;
935
788
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
936
789
if (select_ret == -1){
937
790
perror("select");
938
791
exitstatus = EXIT_FAILURE;
939
goto fallback;
792
goto end;
940
793
}
941
794
/* OK, now either a process completed, or something can be read
942
795
from one of them */
943
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
796
for(process *proc = process_list; proc ; proc = proc->next){
944
797
/* Is this process completely done? */
945
798
if(proc->eof and proc->completed){
946
799
/* Only accept the plugin output if it exited cleanly */
947
800
if(not WIFEXITED(proc->status)
948
801
or WEXITSTATUS(proc->status) != 0){
949
802
/* Bad exit by plugin */
950
951
803
if(debug){
952
804
if(WIFEXITED(proc->status)){
953
805
fprintf(stderr, "Plugin %u exited with status %d\n",
962
814
(unsigned int) (proc->pid));
963
815
}
964
816
}
965
966
817
/* Remove the plugin */
967
818
FD_CLR(proc->fd, &rfds_all);
968
969
819
/* Block signal while modifying process_list */
970
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
820
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
971
821
if(ret < 0){
972
822
perror("sigprocmask");
973
823
exitstatus = EXIT_FAILURE;
974
goto fallback;
975
}
976
free_plugin(proc);
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
}
977
839
/* We are done modifying process list, so unblock signal */
978
840
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
979
841
NULL);
980
842
if(ret < 0){
981
843
perror("sigprocmask");
982
exitstatus = EXIT_FAILURE;
983
goto fallback;
984
}
985
986
if(plugin_list == NULL){
987
break;
988
}
989
continue;
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;
990
851
}
991
992
852
/* This process exited nicely, so print its buffer */
993
853
994
bool bret = print_out_password(proc->buffer,
995
proc->buffer_length);
854
bool bret = print_out_password(proc->buffer, proc->buffer_length);
996
855
if(not bret){
997
856
perror("print_out_password");
998
857
exitstatus = EXIT_FAILURE;
999
858
}
1000
goto fallback;
859
goto end;
1001
860
}
1002
1003
861
/* This process has not completed. Does it have any output? */
1004
862
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1005
863
/* This process had nothing to say at this time */
1012
870
if (proc->buffer == NULL){
1013
871
perror("malloc");
1014
872
exitstatus = EXIT_FAILURE;
1015
goto fallback;
873
goto end;
1016
874
}
1017
875
proc->buffer_size += BUFFER_SIZE;
1018
876
}
1033
891
}
1034
892
1035
893
1036
fallback:
894
end:
1037
895
1038
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1039
/* Fallback if all plugins failed, none are found or an error
1040
occured */
896
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
897
/* Fallback if all plugins failed, none are found or an error occured */
1041
898
bool bret;
1042
899
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1043
900
char *passwordbuffer = getpass("Password: ");
1045
902
if(not bret){
1046
903
perror("print_out_password");
1047
904
exitstatus = EXIT_FAILURE;
905
goto end;
1048
906
}
1049
907
}
1050
908
1051
909
/* Restore old signal handler */
1052
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1053
if(ret == -1){
1054
perror("sigaction");
1055
exitstatus = EXIT_FAILURE;
1056
}
1057
1058
if(custom_argv != NULL){
1059
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1060
free(*arg);
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
}
1061
922
}
1062
free(custom_argv);
923
free(plugin_list->environ);
924
free(plugin_list);
1063
925
}
1064
926
1065
927
if(dir != NULL){
1067
929
}
1068
930
1069
931
/* Free the process list and kill the processes */
1070
for(plugin *p = plugin_list; p != NULL; p = p->next){
1071
if(p->pid != 0){
1072
close(p->fd);
1073
ret = kill(p->pid, SIGTERM);
1074
if(ret == -1 and errno != ESRCH){
1075
/* Set-uid proccesses might not get closed */
1076
perror("kill");
1077
}
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");
1078
939
}
940
free(process_list->buffer);
941
free(process_list);
1079
942
}
1080
943
1081
944
/* Wait for any remaining child processes to terminate */
1085
948
if(errno != ECHILD){
1086
949
perror("wait");
1087
950
}
1088
1089
free_plugin_list();
1090
1091
free(plugindir);
1092
free(argfile);
1093
951
1094
952
return exitstatus;
1095
953
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0