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- Committer: Teddy Hogeborn
- Date: 2008-09-19 23:31:34 UTC
- Revision ID: teddy@fukt.bsnet.se-20080919233134-h56et87wkgisbk85
* mandos-keygen: New "--passfile" option. Confirm entered password.
* mandos-keygen.xml (SYNOPSIS, OPTIONS): New "--passfile" option.
* mandos-keygen.xml (SYNOPSIS, OPTIONS): New "--passfile" option.
- files added:
- .bzr-builddeb
- debian
- 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
65
65
#include <errno.h> /* errno, EBADF */
66
66
67
67
#define BUFFER_SIZE 256
68
#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"
69
71
70
72
const char *argp_program_version = "plugin-runner 1.0";
71
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
72
74
73
struct process;
75
typedef struct plugin{
76
char *name; /* can be NULL or any plugin name */
77
char **argv;
78
int argc;
79
char **environ;
80
int envc;
81
bool disabled;
74
82
75
typedef struct process{
83
/* Variables used for running processes*/
76
84
pid_t pid;
77
85
int fd;
78
86
char *buffer;
81
89
bool eof;
82
90
volatile bool completed;
83
91
volatile int status;
84
struct process *next;
85
} process;
86
87
typedef struct plugin{
88
char *name; /* can be NULL or any plugin name */
89
char **argv;
90
int argc;
91
char **environ;
92
int envc;
93
bool disabled;
94
92
struct plugin *next;
95
93
} plugin;
96
94
97
static plugin *getplugin(char *name, plugin **plugin_list){
98
for (plugin *p = *plugin_list; p != NULL; p = p->next){
95
static plugin *plugin_list = NULL;
96
97
/* Gets an existing plugin based on name,
98
or if none is found, creates a new one */
99
static plugin *getplugin(char *name){
100
/* Check for exiting plugin with that name */
101
for (plugin *p = plugin_list; p != NULL; p = p->next){
99
102
if ((p->name == name)
100
103
or (p->name and name and (strcmp(p->name, name) == 0))){
101
104
return p;
116
119
117
120
*new_plugin = (plugin) { .name = copy_name,
118
121
.argc = 1,
119
.envc = 0,
120
122
.disabled = false,
121
.next = *plugin_list };
123
.next = plugin_list };
122
124
123
125
new_plugin->argv = malloc(sizeof(char *) * 2);
124
126
if (new_plugin->argv == NULL){
128
130
}
129
131
new_plugin->argv[0] = copy_name;
130
132
new_plugin->argv[1] = NULL;
131
133
132
134
new_plugin->environ = malloc(sizeof(char *));
133
135
if(new_plugin->environ == NULL){
134
136
free(copy_name);
137
139
return NULL;
138
140
}
139
141
new_plugin->environ[0] = NULL;
142
140
143
/* Append the new plugin to the list */
141
*plugin_list = new_plugin;
144
plugin_list = new_plugin;
142
145
return new_plugin;
143
146
}
144
147
174
177
}
175
178
176
179
/* Add to a plugin's environment */
177
static bool add_environment(plugin *p, const char *def){
180
static bool add_environment(plugin *p, const char *def, bool replace){
178
181
if(p == NULL){
179
182
return false;
180
183
}
184
/* namelen = length of name of environment variable */
185
size_t namelen = (size_t)(strchrnul(def, '=') - def);
186
/* Search for this environment variable */
187
for(char **e = p->environ; *e != NULL; e++){
188
if(strncmp(*e, def, namelen + 1) == 0){
189
/* It already exists */
190
if(replace){
191
char *new = realloc(*e, strlen(def) + 1);
192
if(new == NULL){
193
return false;
194
}
195
*e = new;
196
strcpy(*e, def);
197
}
198
return true;
199
}
200
}
181
201
return add_to_char_array(def, &(p->environ), &(p->envc));
182
202
}
183
203
184
185
204
/*
186
205
* Based on the example in the GNU LibC manual chapter 13.13 "File
187
206
* Descriptor Flags".
188
207
* *Note File Descriptor Flags:(libc)Descriptor Flags.
189
208
*/
190
static int set_cloexec_flag(int fd)
191
{
209
static int set_cloexec_flag(int fd){
192
210
int ret = fcntl(fd, F_GETFD, 0);
193
211
/* If reading the flags failed, return error indication now. */
194
212
if(ret < 0){
198
216
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
199
217
}
200
218
201
process *process_list = NULL;
202
219
203
220
/* Mark processes as completed when they exit, and save their exit
204
221
status. */
205
void handle_sigchld(__attribute__((unused)) int sig){
222
static void handle_sigchld(__attribute__((unused)) int sig){
206
223
while(true){
207
process *proc = process_list;
224
plugin *proc = plugin_list;
208
225
int status;
209
226
pid_t pid = waitpid(-1, &status, WNOHANG);
210
227
if(pid == 0){
218
235
/* No child processes */
219
236
break;
220
237
}
221
238
222
239
/* A child exited, find it in process_list */
223
240
while(proc != NULL and proc->pid != pid){
224
241
proc = proc->next;
232
249
}
233
250
}
234
251
235
bool print_out_password(const char *buffer, size_t length){
252
/* Prints out a password to stdout */
253
static bool print_out_password(const char *buffer, size_t length){
236
254
ssize_t ret;
237
if(length>0 and buffer[length-1] == '\n'){
238
length--;
239
}
240
255
for(size_t written = 0; written < length; written += (size_t)ret){
241
256
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
242
257
length - written));
247
262
return true;
248
263
}
249
264
250
char **add_to_argv(char **argv, int *argc, char *arg){
251
if (argv == NULL){
252
*argc = 1;
253
argv = malloc(sizeof(char*) * 2);
254
if(argv == NULL){
255
return NULL;
265
/* Removes and free a plugin from the plugin list */
266
static void free_plugin(plugin *plugin_node){
267
268
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
269
free(*arg);
270
}
271
free(plugin_node->argv);
272
for(char **env = plugin_node->environ; *env != NULL; env++){
273
free(*env);
274
}
275
free(plugin_node->environ);
276
free(plugin_node->buffer);
277
278
/* Removes the plugin from the singly-linked list */
279
if(plugin_node == plugin_list){
280
/* First one - simple */
281
plugin_list = plugin_list->next;
282
} else {
283
/* Second one or later */
284
for(plugin *p = plugin_list; p != NULL; p = p->next){
285
if(p->next == plugin_node){
286
p->next = plugin_node->next;
287
break;
288
}
256
289
}
257
argv[0] = NULL; /* Will be set to argv[0] in main before
258
parsing */
259
argv[1] = NULL;
260
}
261
*argc += 1;
262
argv = realloc(argv, sizeof(char *)
263
* ((unsigned int) *argc + 1));
264
if(argv == NULL){
265
return NULL;
266
}
267
argv[*argc-1] = arg;
268
argv[*argc] = NULL;
269
return argv;
290
}
291
292
free(plugin_node);
270
293
}
271
294
272
static void free_plugin_list(plugin *plugin_list){
273
for(plugin *next; plugin_list != NULL; plugin_list = next){
274
next = plugin_list->next;
275
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
276
free(*arg);
277
}
278
free(plugin_list->argv);
279
for(char **env = plugin_list->environ; *env != NULL; env++){
280
free(*env);
281
}
282
free(plugin_list->environ);
283
free(plugin_list);
295
static void free_plugin_list(void){
296
while(plugin_list != NULL){
297
free_plugin(plugin_list);
284
298
}
285
299
}
286
300
287
301
int main(int argc, char *argv[]){
288
const char *plugindir = "/lib/mandos/plugins.d";
289
const char *argfile = ARGFILE;
302
char *plugindir = NULL;
303
char *argfile = NULL;
290
304
FILE *conffp;
291
305
size_t d_name_len;
292
306
DIR *dir = NULL;
324
338
{ .name = "global-options", .key = 'g',
325
339
.arg = "OPTION[,OPTION[,...]]",
326
340
.doc = "Options passed to all plugins" },
327
{ .name = "global-envs", .key = 'e',
341
{ .name = "global-env", .key = 'G',
328
342
.arg = "VAR=value",
329
343
.doc = "Environment variable passed to all plugins" },
330
344
{ .name = "options-for", .key = 'o',
331
345
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
332
346
.doc = "Options passed only to specified plugin" },
333
{ .name = "envs-for", .key = 'f',
347
{ .name = "env-for", .key = 'E',
334
348
.arg = "PLUGIN:ENV=value",
335
349
.doc = "Environment variable passed to specified plugin" },
336
350
{ .name = "disable", .key = 'd',
337
351
.arg = "PLUGIN",
338
352
.doc = "Disable a specific plugin", .group = 1 },
353
{ .name = "enable", .key = 'e',
354
.arg = "PLUGIN",
355
.doc = "Enable a specific plugin", .group = 1 },
339
356
{ .name = "plugin-dir", .key = 128,
340
357
.arg = "DIRECTORY",
341
358
.doc = "Specify a different plugin directory", .group = 2 },
342
{ .name = "userid", .key = 129,
343
.arg = "ID", .flags = 0,
344
.doc = "User ID the plugins will run as", .group = 2 },
345
{ .name = "groupid", .key = 130,
346
.arg = "ID", .flags = 0,
347
.doc = "Group ID the plugins will run as", .group = 2 },
348
{ .name = "debug", .key = 131,
349
.doc = "Debug mode", .group = 3 },
359
{ .name = "config-file", .key = 129,
360
.arg = "FILE",
361
.doc = "Specify a different configuration file", .group = 2 },
362
{ .name = "userid", .key = 130,
363
.arg = "ID", .flags = 0,
364
.doc = "User ID the plugins will run as", .group = 3 },
365
{ .name = "groupid", .key = 131,
366
.arg = "ID", .flags = 0,
367
.doc = "Group ID the plugins will run as", .group = 3 },
368
{ .name = "debug", .key = 132,
369
.doc = "Debug mode", .group = 4 },
350
370
{ .name = NULL }
351
371
};
352
372
353
error_t parse_opt (int key, char *arg, struct argp_state *state) {
354
/* Get the INPUT argument from `argp_parse', which we know is a
355
pointer to our plugin list pointer. */
356
plugin **plugins = state->input;
373
error_t parse_opt (int key, char *arg, __attribute__((unused))
374
struct argp_state *state) {
357
375
switch (key) {
358
case 'g':
376
case 'g': /* --global-options */
359
377
if (arg != NULL){
360
378
char *p;
361
379
while((p = strsep(&arg, ",")) != NULL){
362
380
if(p[0] == '\0'){
363
381
continue;
364
382
}
365
if(not add_argument(getplugin(NULL, plugins), p)){
383
if(not add_argument(getplugin(NULL), p)){
366
384
perror("add_argument");
367
385
return ARGP_ERR_UNKNOWN;
368
386
}
369
387
}
370
388
}
371
389
break;
372
case 'e':
390
case 'G': /* --global-env */
373
391
if(arg == NULL){
374
392
break;
375
393
}
376
{
377
char *envdef = strdup(arg);
378
if(envdef == NULL){
379
break;
380
}
381
if(not add_environment(getplugin(NULL, plugins), envdef)){
382
perror("add_environment");
383
}
394
if(not add_environment(getplugin(NULL), arg, true)){
395
perror("add_environment");
384
396
}
385
397
break;
386
case 'o':
398
case 'o': /* --options-for */
387
399
if (arg != NULL){
388
400
char *p_name = strsep(&arg, ":");
389
if(p_name[0] == '\0'){
401
if(p_name[0] == '\0' or arg == NULL){
390
402
break;
391
403
}
392
404
char *opt = strsep(&arg, ":");
393
if(opt[0] == '\0'){
405
if(opt[0] == '\0' or opt == NULL){
394
406
break;
395
407
}
396
if(opt != NULL){
397
char *p;
398
while((p = strsep(&opt, ",")) != NULL){
399
if(p[0] == '\0'){
400
continue;
401
}
402
if(not add_argument(getplugin(p_name, plugins), p)){
403
perror("add_argument");
404
return ARGP_ERR_UNKNOWN;
405
}
408
char *p;
409
while((p = strsep(&opt, ",")) != NULL){
410
if(p[0] == '\0'){
411
continue;
412
}
413
if(not add_argument(getplugin(p_name), p)){
414
perror("add_argument");
415
return ARGP_ERR_UNKNOWN;
406
416
}
407
417
}
408
418
}
409
419
break;
410
case 'f':
420
case 'E': /* --env-for */
411
421
if(arg == NULL){
412
422
break;
413
423
}
416
426
if(envdef == NULL){
417
427
break;
418
428
}
419
char *p_name = strndup(arg, (size_t) (envdef-arg));
420
if(p_name == NULL){
421
break;
422
}
423
envdef++;
424
if(not add_environment(getplugin(p_name, plugins), envdef)){
429
*envdef = '\0';
430
if(not add_environment(getplugin(arg), envdef+1, true)){
425
431
perror("add_environment");
426
432
}
427
433
}
428
434
break;
429
case 'd':
435
case 'd': /* --disable */
430
436
if (arg != NULL){
431
plugin *p = getplugin(arg, plugins);
437
plugin *p = getplugin(arg);
432
438
if(p == NULL){
433
439
return ARGP_ERR_UNKNOWN;
434
440
}
435
441
p->disabled = true;
436
442
}
437
443
break;
438
case 128:
439
plugindir = arg;
440
break;
441
case 129:
444
case 'e': /* --enable */
445
if (arg != NULL){
446
plugin *p = getplugin(arg);
447
if(p == NULL){
448
return ARGP_ERR_UNKNOWN;
449
}
450
p->disabled = false;
451
}
452
break;
453
case 128: /* --plugin-dir */
454
free(plugindir);
455
plugindir = strdup(arg);
456
if(plugindir == NULL){
457
perror("strdup");
458
}
459
break;
460
case 129: /* --config-file */
461
/* This is already done by parse_opt_config_file() */
462
break;
463
case 130: /* --userid */
442
464
uid = (uid_t)strtol(arg, NULL, 10);
443
465
break;
444
case 130:
466
case 131: /* --groupid */
445
467
gid = (gid_t)strtol(arg, NULL, 10);
446
468
break;
447
case 131:
469
case 132: /* --debug */
448
470
debug = true;
449
471
break;
450
472
case ARGP_KEY_ARG:
451
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
452
break;
453
case ARGP_KEY_END:
454
break;
455
default:
456
return ARGP_ERR_UNKNOWN;
457
}
458
return 0;
459
}
460
461
plugin *plugin_list = NULL;
462
463
struct argp argp = { .options = options, .parser = parse_opt,
464
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
473
/* Cryptsetup always passes an argument, which is an empty
474
string if "none" was specified in /etc/crypttab. So if
475
argument was empty, we ignore it silently. */
476
if(arg[0] != '\0'){
477
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
478
}
479
break;
480
case ARGP_KEY_END:
481
break;
482
default:
483
return ARGP_ERR_UNKNOWN;
484
}
485
return 0;
486
}
487
488
/* This option parser is the same as parse_opt() above, except it
489
ignores everything but the --config-file option. */
490
error_t parse_opt_config_file (int key, char *arg,
491
__attribute__((unused))
492
struct argp_state *state) {
493
switch (key) {
494
case 'g': /* --global-options */
495
case 'G': /* --global-env */
496
case 'o': /* --options-for */
497
case 'E': /* --env-for */
498
case 'd': /* --disable */
499
case 'e': /* --enable */
500
case 128: /* --plugin-dir */
501
break;
502
case 129: /* --config-file */
503
free(argfile);
504
argfile = strdup(arg);
505
if(argfile == NULL){
506
perror("strdup");
507
}
508
break;
509
case 130: /* --userid */
510
case 131: /* --groupid */
511
case 132: /* --debug */
512
case ARGP_KEY_ARG:
513
case ARGP_KEY_END:
514
break;
515
default:
516
return ARGP_ERR_UNKNOWN;
517
}
518
return 0;
519
}
520
521
struct argp argp = { .options = options,
522
.parser = parse_opt_config_file,
523
.args_doc = "",
465
524
.doc = "Mandos plugin runner -- Run plugins" };
466
525
467
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
526
/* Parse using the parse_opt_config_file in order to get the custom
527
config file location, if any. */
528
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
468
529
if (ret == ARGP_ERR_UNKNOWN){
469
530
fprintf(stderr, "Unknown error while parsing arguments\n");
470
531
exitstatus = EXIT_FAILURE;
471
532
goto fallback;
472
533
}
473
474
conffp = fopen(argfile, "r");
534
535
/* Reset to the normal argument parser */
536
argp.parser = parse_opt;
537
538
/* Open the configfile if available */
539
if (argfile == NULL){
540
conffp = fopen(AFILE, "r");
541
} else {
542
conffp = fopen(argfile, "r");
543
}
475
544
if(conffp != NULL){
476
545
char *org_line = NULL;
477
546
char *p, *arg, *new_arg, *line;
480
549
const char whitespace_delims[] = " \r\t\f\v\n";
481
550
const char comment_delim[] = "#";
482
551
552
custom_argc = 1;
553
custom_argv = malloc(sizeof(char*) * 2);
554
if(custom_argv == NULL){
555
perror("malloc");
556
exitstatus = EXIT_FAILURE;
557
goto fallback;
558
}
559
custom_argv[0] = argv[0];
560
custom_argv[1] = NULL;
561
562
/* for each line in the config file, strip whitespace and ignore
563
commented text */
483
564
while(true){
484
565
sret = getline(&org_line, &size, conffp);
485
566
if(sret == -1){
493
574
continue;
494
575
}
495
576
new_arg = strdup(p);
496
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
497
if (custom_argv == NULL){
498
perror("add_to_argv");
499
exitstatus = EXIT_FAILURE;
500
goto fallback;
501
}
577
if(new_arg == NULL){
578
perror("strdup");
579
exitstatus = EXIT_FAILURE;
580
free(org_line);
581
goto fallback;
582
}
583
584
custom_argc += 1;
585
custom_argv = realloc(custom_argv, sizeof(char *)
586
* ((unsigned int) custom_argc + 1));
587
if(custom_argv == NULL){
588
perror("realloc");
589
exitstatus = EXIT_FAILURE;
590
free(org_line);
591
goto fallback;
592
}
593
custom_argv[custom_argc-1] = new_arg;
594
custom_argv[custom_argc] = NULL;
502
595
}
503
596
}
504
597
free(org_line);
505
} else{
598
} else {
506
599
/* Check for harmful errors and go to fallback. Other errors might
507
600
not affect opening plugins */
508
601
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
511
604
goto fallback;
512
605
}
513
606
}
514
607
/* If there was any arguments from configuration file,
608
pass them to parser as command arguments */
515
609
if(custom_argv != NULL){
516
custom_argv[0] = argv[0];
517
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0,
518
&plugin_list);
610
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
611
0, NULL);
519
612
if (ret == ARGP_ERR_UNKNOWN){
520
613
fprintf(stderr, "Unknown error while parsing arguments\n");
521
614
exitstatus = EXIT_FAILURE;
523
616
}
524
617
}
525
618
619
/* Parse actual command line arguments, to let them override the
620
config file */
621
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
622
if (ret == ARGP_ERR_UNKNOWN){
623
fprintf(stderr, "Unknown error while parsing arguments\n");
624
exitstatus = EXIT_FAILURE;
625
goto fallback;
626
}
627
526
628
if(debug){
527
629
for(plugin *p = plugin_list; p != NULL; p=p->next){
528
630
fprintf(stderr, "Plugin: %s has %d arguments\n",
537
639
}
538
640
}
539
641
642
/* Strip permissions down to nobody */
540
643
ret = setuid(uid);
541
644
if (ret == -1){
542
645
perror("setuid");
543
}
544
646
}
545
647
setgid(gid);
546
648
if (ret == -1){
547
649
perror("setgid");
548
650
}
549
651
550
dir = opendir(plugindir);
652
if (plugindir == NULL){
653
dir = opendir(PDIR);
654
} else {
655
dir = opendir(plugindir);
656
}
657
551
658
if(dir == NULL){
552
659
perror("Could not open plugin dir");
553
660
exitstatus = EXIT_FAILURE;
569
676
570
677
FD_ZERO(&rfds_all);
571
678
679
/* Read and execute any executable in the plugin directory*/
572
680
while(true){
573
681
dirst = readdir(dir);
574
682
575
// All directory entries have been processed
683
/* All directory entries have been processed */
576
684
if(dirst == NULL){
577
685
if (errno == EBADF){
578
686
perror("readdir");
584
692
585
693
d_name_len = strlen(dirst->d_name);
586
694
587
// Ignore dotfiles, backup files and other junk
695
/* Ignore dotfiles, backup files and other junk */
588
696
{
589
697
bool bad_name = false;
590
698
605
713
break;
606
714
}
607
715
}
608
609
716
if(bad_name){
610
717
continue;
611
718
}
612
613
719
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
614
720
size_t suf_len = strlen(*suf);
615
721
if((d_name_len >= suf_len)
630
736
}
631
737
632
738
char *filename;
633
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
739
if(plugindir == NULL){
740
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
741
} else {
742
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
743
}
634
744
if(ret < 0){
635
745
perror("asprintf");
636
746
continue;
642
752
free(filename);
643
753
continue;
644
754
}
645
755
756
/* Ignore non-executable files */
646
757
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
647
758
if(debug){
648
759
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
651
762
free(filename);
652
763
continue;
653
764
}
654
plugin *p = getplugin(dirst->d_name, &plugin_list);
765
766
plugin *p = getplugin(dirst->d_name);
655
767
if(p == NULL){
656
768
perror("getplugin");
657
769
free(filename);
667
779
}
668
780
{
669
781
/* Add global arguments to argument list for this plugin */
670
plugin *g = getplugin(NULL, &plugin_list);
782
plugin *g = getplugin(NULL);
671
783
if(g != NULL){
672
784
for(char **a = g->argv + 1; *a != NULL; a++){
673
785
if(not add_argument(p, *a)){
676
788
}
677
789
/* Add global environment variables */
678
790
for(char **e = g->environ; *e != NULL; e++){
679
if(not add_environment(p, *e)){
791
if(not add_environment(p, *e, false)){
680
792
perror("add_environment");
681
793
}
682
794
}
687
799
process, too. */
688
800
if(p->environ[0] != NULL){
689
801
for(char **e = environ; *e != NULL; e++){
690
char *copy = strdup(*e);
691
if(copy == NULL){
692
perror("strdup");
693
continue;
694
}
695
if(not add_environment(p, copy)){
802
if(not add_environment(p, *e, false)){
696
803
perror("add_environment");
697
804
}
698
805
}
705
812
exitstatus = EXIT_FAILURE;
706
813
goto fallback;
707
814
}
815
/* Ask OS to automatic close the pipe on exec */
708
816
ret = set_cloexec_flag(pipefd[0]);
709
817
if(ret < 0){
710
818
perror("set_cloexec_flag");
724
832
exitstatus = EXIT_FAILURE;
725
833
goto fallback;
726
834
}
727
// Starting a new process to be watched
835
/* Starting a new process to be watched */
728
836
pid_t pid = fork();
729
837
if(pid == -1){
730
838
perror("fork");
768
876
}
769
877
/* no return */
770
878
}
771
/* parent process */
879
/* Parent process */
880
close(pipefd[1]); /* Close unused write end of pipe */
772
881
free(filename);
773
close(pipefd[1]); /* close unused write end of pipe */
774
process *new_process = malloc(sizeof(process));
775
if (new_process == NULL){
776
perror("malloc");
882
plugin *new_plugin = getplugin(dirst->d_name);
883
if (new_plugin == NULL){
884
perror("getplugin");
777
885
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
778
886
if(ret < 0){
779
perror("sigprocmask");
887
perror("sigprocmask");
780
888
}
781
889
exitstatus = EXIT_FAILURE;
782
890
goto fallback;
783
891
}
784
892
785
*new_process = (struct process){ .pid = pid,
786
.fd = pipefd[0],
787
.next = process_list };
788
// List handling
789
process_list = new_process;
893
new_plugin->pid = pid;
894
new_plugin->fd = pipefd[0];
895
790
896
/* Unblock SIGCHLD so signal handler can be run if this process
791
897
has already completed */
792
898
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
796
902
goto fallback;
797
903
}
798
904
799
FD_SET(new_process->fd, &rfds_all);
905
FD_SET(new_plugin->fd, &rfds_all);
800
906
801
if (maxfd < new_process->fd){
802
maxfd = new_process->fd;
907
if (maxfd < new_plugin->fd){
908
maxfd = new_plugin->fd;
803
909
}
804
910
805
911
}
806
912
807
free_plugin_list(plugin_list);
808
plugin_list = NULL;
809
810
913
closedir(dir);
811
914
dir = NULL;
812
813
if (process_list == NULL){
814
fprintf(stderr, "No plugin processes started. Incorrect plugin"
815
" directory?\n");
816
process_list = NULL;
915
916
for(plugin *p = plugin_list; p != NULL; p = p->next){
917
if(p->pid != 0){
918
break;
919
}
920
if(p->next == NULL){
921
fprintf(stderr, "No plugin processes started. Incorrect plugin"
922
" directory?\n");
923
free_plugin_list();
924
}
817
925
}
818
while(process_list){
926
927
/* Main loop while running plugins exist */
928
while(plugin_list){
819
929
fd_set rfds = rfds_all;
820
930
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
821
931
if (select_ret == -1){
825
935
}
826
936
/* OK, now either a process completed, or something can be read
827
937
from one of them */
828
for(process *proc = process_list; proc ; proc = proc->next){
938
for(plugin *proc = plugin_list; proc != NULL;){
829
939
/* Is this process completely done? */
830
940
if(proc->eof and proc->completed){
831
941
/* Only accept the plugin output if it exited cleanly */
832
942
if(not WIFEXITED(proc->status)
833
943
or WEXITSTATUS(proc->status) != 0){
834
944
/* Bad exit by plugin */
945
835
946
if(debug){
836
947
if(WIFEXITED(proc->status)){
837
948
fprintf(stderr, "Plugin %u exited with status %d\n",
846
957
(unsigned int) (proc->pid));
847
958
}
848
959
}
960
849
961
/* Remove the plugin */
850
962
FD_CLR(proc->fd, &rfds_all);
963
851
964
/* Block signal while modifying process_list */
852
965
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
853
966
if(ret < 0){
855
968
exitstatus = EXIT_FAILURE;
856
969
goto fallback;
857
970
}
858
/* Delete this process entry from the list */
859
if(process_list == proc){
860
/* First one - simple */
861
process_list = proc->next;
862
} else {
863
/* Second one or later */
864
for(process *p = process_list; p != NULL; p = p->next){
865
if(p->next == proc){
866
p->next = proc->next;
867
break;
868
}
869
}
870
}
971
871
972
/* We are done modifying process list, so unblock signal */
872
973
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
873
974
NULL);
874
975
if(ret < 0){
875
976
perror("sigprocmask");
876
}
877
free(proc->buffer);
878
free(proc);
879
/* We deleted this process from the list, so we can't go
880
proc->next. Therefore, start over from the beginning of
881
the process list */
882
break;
977
exitstatus = EXIT_FAILURE;
978
goto fallback;
979
}
980
981
if(plugin_list == NULL){
982
break;
983
}
984
985
plugin *next_plugin = proc->next;
986
free_plugin(proc);
987
proc = next_plugin;
988
continue;
883
989
}
990
884
991
/* This process exited nicely, so print its buffer */
885
992
886
993
bool bret = print_out_password(proc->buffer,
891
998
}
892
999
goto fallback;
893
1000
}
1001
894
1002
/* This process has not completed. Does it have any output? */
895
1003
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
896
1004
/* This process had nothing to say at this time */
1005
proc = proc->next;
897
1006
continue;
898
1007
}
899
1008
/* Before reading, make the process' data buffer large enough */
912
1021
BUFFER_SIZE);
913
1022
if(ret < 0){
914
1023
/* Read error from this process; ignore the error */
1024
proc = proc->next;
915
1025
continue;
916
1026
}
917
1027
if(ret == 0){
926
1036
927
1037
fallback:
928
1038
929
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1039
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
930
1040
/* Fallback if all plugins failed, none are found or an error
931
1041
occured */
932
1042
bool bret;
933
1043
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
934
1044
char *passwordbuffer = getpass("Password: ");
935
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1045
size_t len = strlen(passwordbuffer);
1046
/* Strip trailing newline */
1047
if(len > 0 and passwordbuffer[len-1] == '\n'){
1048
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1049
len--;
1050
}
1051
bret = print_out_password(passwordbuffer, len);
936
1052
if(not bret){
937
1053
perror("print_out_password");
938
1054
exitstatus = EXIT_FAILURE;
947
1063
}
948
1064
949
1065
if(custom_argv != NULL){
950
for(char **arg = custom_argv; *arg != NULL; arg++){
1066
for(char **arg = custom_argv+1; *arg != NULL; arg++){
951
1067
free(*arg);
952
1068
}
953
1069
free(custom_argv);
954
1070
}
955
free_plugin_list(plugin_list);
956
1071
957
1072
if(dir != NULL){
958
1073
closedir(dir);
959
1074
}
960
1075
961
1076
/* Free the process list and kill the processes */
962
for(process *next; process_list != NULL; process_list = next){
963
next = process_list->next;
964
close(process_list->fd);
965
ret = kill(process_list->pid, SIGTERM);
966
if(ret == -1 and errno != ESRCH){
967
/* set-uid proccesses migth not get closed */
968
perror("kill");
1077
for(plugin *p = plugin_list; p != NULL; p = p->next){
1078
if(p->pid != 0){
1079
close(p->fd);
1080
ret = kill(p->pid, SIGTERM);
1081
if(ret == -1 and errno != ESRCH){
1082
/* Set-uid proccesses might not get closed */
1083
perror("kill");
1084
}
969
1085
}
970
free(process_list->buffer);
971
free(process_list);
972
1086
}
973
1087
974
1088
/* Wait for any remaining child processes to terminate */
978
1092
if(errno != ECHILD){
979
1093
perror("wait");
980
1094
}
1095
1096
free_plugin_list();
1097
1098
free(plugindir);
1099
free(argfile);
981
1100
982
1101
return exitstatus;
983
1102
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0