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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 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;
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;
215
if(length>0 and buffer[length-1] == '\n'){
216
length--;
217
}
258
218
for(size_t written = 0; written < length; written += (size_t)ret){
259
219
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
260
220
length - written));
265
225
return true;
266
226
}
267
227
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
}
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;
292
234
}
293
}
294
295
free(plugin_node);
296
}
297
298
static void free_plugin_list(void){
299
while(plugin_list != NULL){
300
free_plugin(plugin_list);
301
}
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;
302
247
}
303
248
304
249
int main(int argc, char *argv[]){
305
char *plugindir = NULL;
306
char *argfile = NULL;
250
const char *plugindir = "/lib/mandos/plugins.d";
251
const char *argfile = ARGFILE;
307
252
FILE *conffp;
308
253
size_t d_name_len;
309
254
DIR *dir = NULL;
324
269
/* Establish a signal handler */
325
270
sigemptyset(&sigchld_action.sa_mask);
326
271
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
327
if(ret == -1){
272
if(ret < 0){
328
273
perror("sigaddset");
329
exitstatus = EXIT_FAILURE;
330
goto fallback;
274
exit(EXIT_FAILURE);
331
275
}
332
276
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
333
if(ret == -1){
277
if(ret < 0){
334
278
perror("sigaction");
335
exitstatus = EXIT_FAILURE;
336
goto fallback;
279
exit(EXIT_FAILURE);
337
280
}
338
281
339
282
/* The options we understand. */
341
284
{ .name = "global-options", .key = 'g',
342
285
.arg = "OPTION[,OPTION[,...]]",
343
286
.doc = "Options passed to all plugins" },
344
{ .name = "global-env", .key = 'G',
287
{ .name = "global-envs", .key = 'e',
345
288
.arg = "VAR=value",
346
289
.doc = "Environment variable passed to all plugins" },
347
290
{ .name = "options-for", .key = 'o',
348
291
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
349
292
.doc = "Options passed only to specified plugin" },
350
{ .name = "env-for", .key = 'E',
293
{ .name = "envs-for", .key = 'f',
351
294
.arg = "PLUGIN:ENV=value",
352
295
.doc = "Environment variable passed to specified plugin" },
353
296
{ .name = "disable", .key = 'd',
354
297
.arg = "PLUGIN",
355
298
.doc = "Disable a specific plugin", .group = 1 },
356
{ .name = "enable", .key = 'e',
357
.arg = "PLUGIN",
358
.doc = "Enable a specific plugin", .group = 1 },
359
299
{ .name = "plugin-dir", .key = 128,
360
300
.arg = "DIRECTORY",
361
301
.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 },
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 },
373
310
{ .name = NULL }
374
311
};
375
312
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
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;
378
317
switch (key) {
379
case 'g': /* --global-options */
318
case 'g':
380
319
if (arg != NULL){
381
320
char *p;
382
321
while((p = strsep(&arg, ",")) != NULL){
383
322
if(p[0] == '\0'){
384
323
continue;
385
324
}
386
if(not add_argument(getplugin(NULL), p)){
325
if(not add_argument(getplugin(NULL, plugins), p)){
387
326
perror("add_argument");
388
327
return ARGP_ERR_UNKNOWN;
389
328
}
390
329
}
391
330
}
392
331
break;
393
case 'G': /* --global-env */
332
case 'e':
394
333
if(arg == NULL){
395
334
break;
396
335
}
397
if(not add_environment(getplugin(NULL), arg, true)){
398
perror("add_environment");
336
{
337
char *envdef = strdup(arg);
338
if(envdef == NULL){
339
break;
340
}
341
if(not add_environment(getplugin(NULL, plugins), envdef)){
342
perror("add_environment");
343
}
399
344
}
400
345
break;
401
case 'o': /* --options-for */
346
case 'o':
402
347
if (arg != NULL){
403
348
char *p_name = strsep(&arg, ":");
404
if(p_name[0] == '\0' or arg == NULL){
349
if(p_name[0] == '\0'){
405
350
break;
406
351
}
407
352
char *opt = strsep(&arg, ":");
408
if(opt[0] == '\0' or opt == NULL){
353
if(opt[0] == '\0'){
409
354
break;
410
355
}
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;
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
}
419
366
}
420
367
}
421
368
}
422
369
break;
423
case 'E': /* --env-for */
370
case 'f':
424
371
if(arg == NULL){
425
372
break;
426
373
}
429
376
if(envdef == NULL){
430
377
break;
431
378
}
432
*envdef = '\0';
433
if(not add_environment(getplugin(arg), envdef+1, true)){
379
char *p_name = strndup(arg, (size_t) (envdef-arg));
380
if(p_name == NULL){
381
break;
382
}
383
envdef++;
384
if(not add_environment(getplugin(p_name, plugins), envdef)){
434
385
perror("add_environment");
435
386
}
436
387
}
437
388
break;
438
case 'd': /* --disable */
389
case 'd':
439
390
if (arg != NULL){
440
plugin *p = getplugin(arg);
391
plugin *p = getplugin(arg, plugins);
441
392
if(p == NULL){
442
393
return ARGP_ERR_UNKNOWN;
443
394
}
444
395
p->disabled = true;
445
396
}
446
397
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 */
398
case 128:
399
plugindir = arg;
400
break;
401
case 129:
467
402
uid = (uid_t)strtol(arg, NULL, 10);
468
403
break;
469
case 131: /* --groupid */
404
case 130:
470
405
gid = (gid_t)strtol(arg, NULL, 10);
471
406
break;
472
case 132: /* --debug */
407
case 131:
473
408
debug = true;
474
409
break;
475
410
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 = "",
411
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
412
break;
413
case ARGP_KEY_END:
414
break;
415
default:
416
return ARGP_ERR_UNKNOWN;
417
}
418
return 0;
419
}
420
421
plugin *plugin_list = NULL;
422
423
struct argp argp = { .options = options, .parser = parse_opt,
424
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
527
425
.doc = "Mandos plugin runner -- Run plugins" };
528
426
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);
427
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
532
428
if (ret == ARGP_ERR_UNKNOWN){
533
429
fprintf(stderr, "Unknown error while parsing arguments\n");
534
430
exitstatus = EXIT_FAILURE;
535
goto fallback;
431
goto end;
536
432
}
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
}
433
434
conffp = fopen(argfile, "r");
547
435
if(conffp != NULL){
548
436
char *org_line = NULL;
549
char *p, *arg, *new_arg, *line;
550
437
size_t size = 0;
551
438
ssize_t sret;
439
char *p, *arg, *new_arg, *line;
552
440
const char whitespace_delims[] = " \r\t\f\v\n";
553
441
const char comment_delim[] = "#";
554
442
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
443
while(true){
568
444
sret = getline(&org_line, &size, conffp);
569
445
if(sret == -1){
577
453
continue;
578
454
}
579
455
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;
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
}
598
462
}
599
463
}
600
464
free(org_line);
601
} else {
465
} else{
602
466
/* Check for harmful errors and go to fallback. Other errors might
603
467
not affect opening plugins */
604
468
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
605
469
perror("fopen");
606
470
exitstatus = EXIT_FAILURE;
607
goto fallback;
471
goto end;
608
472
}
609
473
}
610
/* If there was any arguments from configuration file,
611
pass them to parser as command arguments */
474
612
475
if(custom_argv != NULL){
613
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
614
0, NULL);
476
custom_argv[0] = argv[0];
477
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
615
478
if (ret == ARGP_ERR_UNKNOWN){
616
479
fprintf(stderr, "Unknown error while parsing arguments\n");
617
480
exitstatus = EXIT_FAILURE;
618
goto fallback;
481
goto end;
619
482
}
620
483
}
621
484
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
485
if(debug){
632
486
for(plugin *p = plugin_list; p != NULL; p=p->next){
633
487
fprintf(stderr, "Plugin: %s has %d arguments\n",
642
496
}
643
497
}
644
498
645
/* Strip permissions down to nobody */
646
499
ret = setuid(uid);
647
500
if (ret == -1){
648
501
perror("setuid");
649
}
502
}
503
650
504
setgid(gid);
651
505
if (ret == -1){
652
506
perror("setgid");
653
507
}
654
508
655
if (plugindir == NULL){
656
dir = opendir(PDIR);
657
} else {
658
dir = opendir(plugindir);
659
}
660
509
dir = opendir(plugindir);
661
510
if(dir == NULL){
662
511
perror("Could not open plugin dir");
663
512
exitstatus = EXIT_FAILURE;
664
goto fallback;
513
goto end;
665
514
}
666
515
667
516
/* Set the FD_CLOEXEC flag on the directory, if possible */
672
521
if(ret < 0){
673
522
perror("set_cloexec_flag");
674
523
exitstatus = EXIT_FAILURE;
675
goto fallback;
524
goto end;
676
525
}
677
526
}
678
527
}
679
528
680
529
FD_ZERO(&rfds_all);
681
530
682
/* Read and execute any executable in the plugin directory*/
683
531
while(true){
684
532
dirst = readdir(dir);
685
533
686
/* All directory entries have been processed */
534
// All directory entries have been processed
687
535
if(dirst == NULL){
688
536
if (errno == EBADF){
689
537
perror("readdir");
690
538
exitstatus = EXIT_FAILURE;
691
goto fallback;
539
goto end;
692
540
}
693
541
break;
694
542
}
695
543
696
544
d_name_len = strlen(dirst->d_name);
697
545
698
/* Ignore dotfiles, backup files and other junk */
546
// Ignore dotfiles, backup files and other junk
699
547
{
700
548
bool bad_name = false;
701
549
716
564
break;
717
565
}
718
566
}
567
719
568
if(bad_name){
720
569
continue;
721
570
}
571
722
572
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
723
573
size_t suf_len = strlen(*suf);
724
574
if((d_name_len >= suf_len)
739
589
}
740
590
741
591
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
}
592
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
747
593
if(ret < 0){
748
594
perror("asprintf");
749
595
continue;
755
601
free(filename);
756
602
continue;
757
603
}
758
759
/* Ignore non-executable files */
604
760
605
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
761
606
if(debug){
762
607
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
765
610
free(filename);
766
611
continue;
767
612
}
768
769
plugin *p = getplugin(dirst->d_name);
613
plugin *p = getplugin(dirst->d_name, &plugin_list);
770
614
if(p == NULL){
771
615
perror("getplugin");
772
616
free(filename);
782
626
}
783
627
{
784
628
/* Add global arguments to argument list for this plugin */
785
plugin *g = getplugin(NULL);
629
plugin *g = getplugin(NULL, &plugin_list);
786
630
if(g != NULL){
787
631
for(char **a = g->argv + 1; *a != NULL; a++){
788
632
if(not add_argument(p, *a)){
791
635
}
792
636
/* Add global environment variables */
793
637
for(char **e = g->environ; *e != NULL; e++){
794
if(not add_environment(p, *e, false)){
638
if(not add_environment(p, *e)){
795
639
perror("add_environment");
796
640
}
797
641
}
802
646
process, too. */
803
647
if(p->environ[0] != NULL){
804
648
for(char **e = environ; *e != NULL; e++){
805
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)){
806
655
perror("add_environment");
807
656
}
808
657
}
809
658
}
810
659
811
int pipefd[2];
660
int pipefd[2];
812
661
ret = pipe(pipefd);
813
662
if (ret == -1){
814
663
perror("pipe");
815
664
exitstatus = EXIT_FAILURE;
816
goto fallback;
665
goto end;
817
666
}
818
/* Ask OS to automatic close the pipe on exec */
819
667
ret = set_cloexec_flag(pipefd[0]);
820
668
if(ret < 0){
821
669
perror("set_cloexec_flag");
822
670
exitstatus = EXIT_FAILURE;
823
goto fallback;
671
goto end;
824
672
}
825
673
ret = set_cloexec_flag(pipefd[1]);
826
674
if(ret < 0){
827
675
perror("set_cloexec_flag");
828
676
exitstatus = EXIT_FAILURE;
829
goto fallback;
677
goto end;
830
678
}
831
679
/* Block SIGCHLD until process is safely in process list */
832
680
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
833
681
if(ret < 0){
834
682
perror("sigprocmask");
835
683
exitstatus = EXIT_FAILURE;
836
goto fallback;
684
goto end;
837
685
}
838
/* Starting a new process to be watched */
686
// Starting a new process to be watched
839
687
pid_t pid = fork();
840
688
if(pid == -1){
841
689
perror("fork");
842
690
exitstatus = EXIT_FAILURE;
843
goto fallback;
691
goto end;
844
692
}
845
693
if(pid == 0){
846
694
/* this is the child process */
879
727
}
880
728
/* no return */
881
729
}
882
/* Parent process */
883
close(pipefd[1]); /* Close unused write end of pipe */
730
/* parent process */
884
731
free(filename);
885
plugin *new_plugin = getplugin(dirst->d_name);
886
if (new_plugin == NULL){
887
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");
888
736
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
889
737
if(ret < 0){
890
perror("sigprocmask");
738
perror("sigprocmask");
891
739
}
892
740
exitstatus = EXIT_FAILURE;
893
goto fallback;
741
goto end;
894
742
}
895
743
896
new_plugin->pid = pid;
897
new_plugin->fd = pipefd[0];
898
744
*new_process = (struct process){ .pid = pid,
745
.fd = pipefd[0],
746
.next = process_list };
747
// List handling
748
process_list = new_process;
899
749
/* Unblock SIGCHLD so signal handler can be run if this process
900
750
has already completed */
901
751
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
902
752
if(ret < 0){
903
753
perror("sigprocmask");
904
754
exitstatus = EXIT_FAILURE;
905
goto fallback;
906
}
907
908
FD_SET(new_plugin->fd, &rfds_all);
909
910
if (maxfd < new_plugin->fd){
911
maxfd = new_plugin->fd;
912
}
913
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);
914
776
}
915
777
916
778
closedir(dir);
917
779
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
}
780
781
if (process_list == NULL){
782
fprintf(stderr, "No plugin processes started. Incorrect plugin"
783
" directory?\n");
784
process_list = NULL;
928
785
}
929
930
/* Main loop while running plugins exist */
931
while(plugin_list){
786
while(process_list){
932
787
fd_set rfds = rfds_all;
933
788
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
934
789
if (select_ret == -1){
935
790
perror("select");
936
791
exitstatus = EXIT_FAILURE;
937
goto fallback;
792
goto end;
938
793
}
939
794
/* OK, now either a process completed, or something can be read
940
795
from one of them */
941
for(plugin *proc = plugin_list; proc != NULL;){
796
for(process *proc = process_list; proc ; proc = proc->next){
942
797
/* Is this process completely done? */
943
798
if(proc->eof and proc->completed){
944
799
/* Only accept the plugin output if it exited cleanly */
945
800
if(not WIFEXITED(proc->status)
946
801
or WEXITSTATUS(proc->status) != 0){
947
802
/* Bad exit by plugin */
948
949
803
if(debug){
950
804
if(WIFEXITED(proc->status)){
951
805
fprintf(stderr, "Plugin %u exited with status %d\n",
960
814
(unsigned int) (proc->pid));
961
815
}
962
816
}
963
964
817
/* Remove the plugin */
965
818
FD_CLR(proc->fd, &rfds_all);
966
967
819
/* Block signal while modifying process_list */
968
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
820
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
969
821
if(ret < 0){
970
822
perror("sigprocmask");
971
823
exitstatus = EXIT_FAILURE;
972
goto fallback;
973
}
974
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
}
975
839
/* We are done modifying process list, so unblock signal */
976
840
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
977
841
NULL);
978
842
if(ret < 0){
979
843
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;
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;
992
851
}
993
994
852
/* This process exited nicely, so print its buffer */
995
853
996
bool bret = print_out_password(proc->buffer,
997
proc->buffer_length);
854
bool bret = print_out_password(proc->buffer, proc->buffer_length);
998
855
if(not bret){
999
856
perror("print_out_password");
1000
857
exitstatus = EXIT_FAILURE;
1001
858
}
1002
goto fallback;
859
goto end;
1003
860
}
1004
1005
861
/* This process has not completed. Does it have any output? */
1006
862
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1007
863
/* This process had nothing to say at this time */
1008
proc = proc->next;
1009
864
continue;
1010
865
}
1011
866
/* Before reading, make the process' data buffer large enough */
1015
870
if (proc->buffer == NULL){
1016
871
perror("malloc");
1017
872
exitstatus = EXIT_FAILURE;
1018
goto fallback;
873
goto end;
1019
874
}
1020
875
proc->buffer_size += BUFFER_SIZE;
1021
876
}
1024
879
BUFFER_SIZE);
1025
880
if(ret < 0){
1026
881
/* Read error from this process; ignore the error */
1027
proc = proc->next;
1028
882
continue;
1029
883
}
1030
884
if(ret == 0){
1037
891
}
1038
892
1039
893
1040
fallback:
894
end:
1041
895
1042
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1043
/* Fallback if all plugins failed, none are found or an error
1044
occured */
896
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
897
/* Fallback if all plugins failed, none are found or an error occured */
1045
898
bool bret;
1046
899
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1047
900
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);
901
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1055
902
if(not bret){
1056
903
perror("print_out_password");
1057
904
exitstatus = EXIT_FAILURE;
905
goto end;
1058
906
}
1059
907
}
1060
908
1061
909
/* Restore old signal handler */
1062
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1063
if(ret == -1){
1064
perror("sigaction");
1065
exitstatus = EXIT_FAILURE;
1066
}
1067
1068
if(custom_argv != NULL){
1069
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1070
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
}
1071
922
}
1072
free(custom_argv);
923
free(plugin_list->environ);
924
free(plugin_list);
1073
925
}
1074
926
1075
927
if(dir != NULL){
1077
929
}
1078
930
1079
931
/* 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
}
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");
1088
939
}
940
free(process_list->buffer);
941
free(process_list);
1089
942
}
1090
943
1091
944
/* Wait for any remaining child processes to terminate */
1095
948
if(errno != ECHILD){
1096
949
perror("wait");
1097
950
}
1098
1099
free_plugin_list();
1100
1101
free(plugindir);
1102
free(argfile);
1103
951
1104
952
return exitstatus;
1105
953
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0