To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 183
- compare with another revision
- download diff
- download tarball
- view history from revision 183
- Committer: Teddy Hogeborn
- Date: 2008-09-13 15:36:18 UTC
- Revision ID: teddy@fukt.bsnet.se-20080913153618-atp386q2bqj0ku99
* Makefile (install-client-nokey): Do "&&" instead of ";" to catch
errors.
* README: Kill the straight quotes. Add copyright notice.
* overview.xml: Improved wording.
errors.
* README: Kill the straight quotes. Add copyright notice.
* overview.xml: Improved wording.
- files added:
- .bzrignore
- files removed:
- network-protocol.txt
- 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
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 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){
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) + 1);
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
if(length>0 and buffer[length-1] == '\n'){
216
length--;
217
}
218
258
for(size_t written = 0; written < length; written += (size_t)ret){
219
259
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
220
260
length - written));
225
265
return true;
226
266
}
227
267
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;
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
}
234
292
}
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;
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
}
247
302
}
248
303
249
304
int main(int argc, char *argv[]){
250
const char *plugindir = "/lib/mandos/plugins.d";
251
const char *argfile = ARGFILE;
305
char *plugindir = NULL;
306
char *argfile = NULL;
252
307
FILE *conffp;
253
308
size_t d_name_len;
254
309
DIR *dir = NULL;
269
324
/* Establish a signal handler */
270
325
sigemptyset(&sigchld_action.sa_mask);
271
326
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
272
if(ret < 0){
327
if(ret == -1){
273
328
perror("sigaddset");
274
exit(EXIT_FAILURE);
329
exitstatus = EXIT_FAILURE;
330
goto fallback;
275
331
}
276
332
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
277
if(ret < 0){
333
if(ret == -1){
278
334
perror("sigaction");
279
exit(EXIT_FAILURE);
335
exitstatus = EXIT_FAILURE;
336
goto fallback;
280
337
}
281
338
282
339
/* The options we understand. */
284
341
{ .name = "global-options", .key = 'g',
285
342
.arg = "OPTION[,OPTION[,...]]",
286
343
.doc = "Options passed to all plugins" },
287
{ .name = "global-envs", .key = 'e',
344
{ .name = "global-env", .key = 'G',
288
345
.arg = "VAR=value",
289
346
.doc = "Environment variable passed to all plugins" },
290
347
{ .name = "options-for", .key = 'o',
291
348
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
292
349
.doc = "Options passed only to specified plugin" },
293
{ .name = "envs-for", .key = 'f',
350
{ .name = "env-for", .key = 'E',
294
351
.arg = "PLUGIN:ENV=value",
295
352
.doc = "Environment variable passed to specified plugin" },
296
353
{ .name = "disable", .key = 'd',
297
354
.arg = "PLUGIN",
298
355
.doc = "Disable a specific plugin", .group = 1 },
356
{ .name = "enable", .key = 'e',
357
.arg = "PLUGIN",
358
.doc = "Enable a specific plugin", .group = 1 },
299
359
{ .name = "plugin-dir", .key = 128,
300
360
.arg = "DIRECTORY",
301
361
.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 },
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 },
310
373
{ .name = NULL }
311
374
};
312
375
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;
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
317
378
switch (key) {
318
case 'g':
379
case 'g': /* --global-options */
319
380
if (arg != NULL){
320
381
char *p;
321
382
while((p = strsep(&arg, ",")) != NULL){
322
383
if(p[0] == '\0'){
323
384
continue;
324
385
}
325
if(not add_argument(getplugin(NULL, plugins), p)){
386
if(not add_argument(getplugin(NULL), p)){
326
387
perror("add_argument");
327
388
return ARGP_ERR_UNKNOWN;
328
389
}
329
390
}
330
391
}
331
392
break;
332
case 'e':
393
case 'G': /* --global-env */
333
394
if(arg == NULL){
334
395
break;
335
396
}
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
}
397
if(not add_environment(getplugin(NULL), arg, true)){
398
perror("add_environment");
344
399
}
345
400
break;
346
case 'o':
401
case 'o': /* --options-for */
347
402
if (arg != NULL){
348
403
char *p_name = strsep(&arg, ":");
349
if(p_name[0] == '\0'){
404
if(p_name[0] == '\0' or arg == NULL){
350
405
break;
351
406
}
352
407
char *opt = strsep(&arg, ":");
353
if(opt[0] == '\0'){
408
if(opt[0] == '\0' or opt == NULL){
354
409
break;
355
410
}
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
}
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;
366
419
}
367
420
}
368
421
}
369
422
break;
370
case 'f':
423
case 'E': /* --env-for */
371
424
if(arg == NULL){
372
425
break;
373
426
}
376
429
if(envdef == NULL){
377
430
break;
378
431
}
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)){
432
*envdef = '\0';
433
if(not add_environment(getplugin(arg), envdef+1, true)){
385
434
perror("add_environment");
386
435
}
387
436
}
388
437
break;
389
case 'd':
438
case 'd': /* --disable */
390
439
if (arg != NULL){
391
plugin *p = getplugin(arg, plugins);
440
plugin *p = getplugin(arg);
392
441
if(p == NULL){
393
442
return ARGP_ERR_UNKNOWN;
394
443
}
395
444
p->disabled = true;
396
445
}
397
446
break;
398
case 128:
399
plugindir = arg;
400
break;
401
case 129:
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 */
402
467
uid = (uid_t)strtol(arg, NULL, 10);
403
468
break;
404
case 130:
469
case 131: /* --groupid */
405
470
gid = (gid_t)strtol(arg, NULL, 10);
406
471
break;
407
case 131:
472
case 132: /* --debug */
408
473
debug = true;
409
474
break;
410
475
case ARGP_KEY_ARG:
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]",
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 = "",
425
527
.doc = "Mandos plugin runner -- Run plugins" };
426
528
427
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
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);
428
532
if (ret == ARGP_ERR_UNKNOWN){
429
533
fprintf(stderr, "Unknown error while parsing arguments\n");
430
534
exitstatus = EXIT_FAILURE;
431
goto end;
535
goto fallback;
432
536
}
433
434
conffp = fopen(argfile, "r");
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
}
435
547
if(conffp != NULL){
436
548
char *org_line = NULL;
549
char *p, *arg, *new_arg, *line;
437
550
size_t size = 0;
438
551
ssize_t sret;
439
char *p, *arg, *new_arg, *line;
440
552
const char whitespace_delims[] = " \r\t\f\v\n";
441
553
const char comment_delim[] = "#";
442
554
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 */
443
567
while(true){
444
568
sret = getline(&org_line, &size, conffp);
445
569
if(sret == -1){
453
577
continue;
454
578
}
455
579
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
}
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;
462
598
}
463
599
}
464
600
free(org_line);
465
} else{
601
} else {
466
602
/* Check for harmful errors and go to fallback. Other errors might
467
603
not affect opening plugins */
468
604
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
469
605
perror("fopen");
470
606
exitstatus = EXIT_FAILURE;
471
goto end;
607
goto fallback;
472
608
}
473
609
}
474
610
/* If there was any arguments from configuration file,
611
pass them to parser as command arguments */
475
612
if(custom_argv != NULL){
476
custom_argv[0] = argv[0];
477
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
613
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
614
0, NULL);
478
615
if (ret == ARGP_ERR_UNKNOWN){
479
616
fprintf(stderr, "Unknown error while parsing arguments\n");
480
617
exitstatus = EXIT_FAILURE;
481
goto end;
618
goto fallback;
482
619
}
483
620
}
484
621
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
485
631
if(debug){
486
632
for(plugin *p = plugin_list; p != NULL; p=p->next){
487
633
fprintf(stderr, "Plugin: %s has %d arguments\n",
496
642
}
497
643
}
498
644
645
/* Strip permissions down to nobody */
499
646
ret = setuid(uid);
500
647
if (ret == -1){
501
648
perror("setuid");
502
}
503
649
}
504
650
setgid(gid);
505
651
if (ret == -1){
506
652
perror("setgid");
507
653
}
508
654
509
dir = opendir(plugindir);
655
if (plugindir == NULL){
656
dir = opendir(PDIR);
657
} else {
658
dir = opendir(plugindir);
659
}
660
510
661
if(dir == NULL){
511
662
perror("Could not open plugin dir");
512
663
exitstatus = EXIT_FAILURE;
513
goto end;
664
goto fallback;
514
665
}
515
666
516
667
/* Set the FD_CLOEXEC flag on the directory, if possible */
521
672
if(ret < 0){
522
673
perror("set_cloexec_flag");
523
674
exitstatus = EXIT_FAILURE;
524
goto end;
675
goto fallback;
525
676
}
526
677
}
527
678
}
528
679
529
680
FD_ZERO(&rfds_all);
530
681
682
/* Read and execute any executable in the plugin directory*/
531
683
while(true){
532
684
dirst = readdir(dir);
533
685
534
// All directory entries have been processed
686
/* All directory entries have been processed */
535
687
if(dirst == NULL){
536
688
if (errno == EBADF){
537
689
perror("readdir");
538
690
exitstatus = EXIT_FAILURE;
539
goto end;
691
goto fallback;
540
692
}
541
693
break;
542
694
}
543
695
544
696
d_name_len = strlen(dirst->d_name);
545
697
546
// Ignore dotfiles, backup files and other junk
698
/* Ignore dotfiles, backup files and other junk */
547
699
{
548
700
bool bad_name = false;
549
701
564
716
break;
565
717
}
566
718
}
567
568
719
if(bad_name){
569
720
continue;
570
721
}
571
572
722
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
573
723
size_t suf_len = strlen(*suf);
574
724
if((d_name_len >= suf_len)
589
739
}
590
740
591
741
char *filename;
592
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
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
}
593
747
if(ret < 0){
594
748
perror("asprintf");
595
749
continue;
601
755
free(filename);
602
756
continue;
603
757
}
604
758
759
/* Ignore non-executable files */
605
760
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
606
761
if(debug){
607
762
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
610
765
free(filename);
611
766
continue;
612
767
}
613
plugin *p = getplugin(dirst->d_name, &plugin_list);
768
769
plugin *p = getplugin(dirst->d_name);
614
770
if(p == NULL){
615
771
perror("getplugin");
616
772
free(filename);
626
782
}
627
783
{
628
784
/* Add global arguments to argument list for this plugin */
629
plugin *g = getplugin(NULL, &plugin_list);
785
plugin *g = getplugin(NULL);
630
786
if(g != NULL){
631
787
for(char **a = g->argv + 1; *a != NULL; a++){
632
788
if(not add_argument(p, *a)){
635
791
}
636
792
/* Add global environment variables */
637
793
for(char **e = g->environ; *e != NULL; e++){
638
if(not add_environment(p, *e)){
794
if(not add_environment(p, *e, false)){
639
795
perror("add_environment");
640
796
}
641
797
}
646
802
process, too. */
647
803
if(p->environ[0] != NULL){
648
804
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)){
805
if(not add_environment(p, *e, false)){
655
806
perror("add_environment");
656
807
}
657
808
}
658
809
}
659
810
660
int pipefd[2];
811
int pipefd[2];
661
812
ret = pipe(pipefd);
662
813
if (ret == -1){
663
814
perror("pipe");
664
815
exitstatus = EXIT_FAILURE;
665
goto end;
816
goto fallback;
666
817
}
818
/* Ask OS to automatic close the pipe on exec */
667
819
ret = set_cloexec_flag(pipefd[0]);
668
820
if(ret < 0){
669
821
perror("set_cloexec_flag");
670
822
exitstatus = EXIT_FAILURE;
671
goto end;
823
goto fallback;
672
824
}
673
825
ret = set_cloexec_flag(pipefd[1]);
674
826
if(ret < 0){
675
827
perror("set_cloexec_flag");
676
828
exitstatus = EXIT_FAILURE;
677
goto end;
829
goto fallback;
678
830
}
679
831
/* Block SIGCHLD until process is safely in process list */
680
832
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
681
833
if(ret < 0){
682
834
perror("sigprocmask");
683
835
exitstatus = EXIT_FAILURE;
684
goto end;
836
goto fallback;
685
837
}
686
// Starting a new process to be watched
838
/* Starting a new process to be watched */
687
839
pid_t pid = fork();
688
840
if(pid == -1){
689
841
perror("fork");
690
842
exitstatus = EXIT_FAILURE;
691
goto end;
843
goto fallback;
692
844
}
693
845
if(pid == 0){
694
846
/* this is the child process */
727
879
}
728
880
/* no return */
729
881
}
730
/* parent process */
882
/* Parent process */
883
close(pipefd[1]); /* Close unused write end of pipe */
731
884
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");
885
plugin *new_plugin = getplugin(dirst->d_name);
886
if (new_plugin == NULL){
887
perror("getplugin");
736
888
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
737
889
if(ret < 0){
738
perror("sigprocmask");
890
perror("sigprocmask");
739
891
}
740
892
exitstatus = EXIT_FAILURE;
741
goto end;
893
goto fallback;
742
894
}
743
895
744
*new_process = (struct process){ .pid = pid,
745
.fd = pipefd[0],
746
.next = process_list };
747
// List handling
748
process_list = new_process;
896
new_plugin->pid = pid;
897
new_plugin->fd = pipefd[0];
898
749
899
/* Unblock SIGCHLD so signal handler can be run if this process
750
900
has already completed */
751
901
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
752
902
if(ret < 0){
753
903
perror("sigprocmask");
754
904
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);
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
776
914
}
777
915
778
916
closedir(dir);
779
917
dir = NULL;
780
781
if (process_list == NULL){
782
fprintf(stderr, "No plugin processes started. Incorrect plugin"
783
" directory?\n");
784
process_list = 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
}
785
928
}
786
while(process_list){
929
930
/* Main loop while running plugins exist */
931
while(plugin_list){
787
932
fd_set rfds = rfds_all;
788
933
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
789
934
if (select_ret == -1){
790
935
perror("select");
791
936
exitstatus = EXIT_FAILURE;
792
goto end;
937
goto fallback;
793
938
}
794
939
/* OK, now either a process completed, or something can be read
795
940
from one of them */
796
for(process *proc = process_list; proc ; proc = proc->next){
941
for(plugin *proc = plugin_list; proc != NULL;){
797
942
/* Is this process completely done? */
798
943
if(proc->eof and proc->completed){
799
944
/* Only accept the plugin output if it exited cleanly */
800
945
if(not WIFEXITED(proc->status)
801
946
or WEXITSTATUS(proc->status) != 0){
802
947
/* Bad exit by plugin */
948
803
949
if(debug){
804
950
if(WIFEXITED(proc->status)){
805
951
fprintf(stderr, "Plugin %u exited with status %d\n",
814
960
(unsigned int) (proc->pid));
815
961
}
816
962
}
963
817
964
/* Remove the plugin */
818
965
FD_CLR(proc->fd, &rfds_all);
966
819
967
/* Block signal while modifying process_list */
820
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
968
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
821
969
if(ret < 0){
822
970
perror("sigprocmask");
823
971
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
}
972
goto fallback;
973
}
974
839
975
/* We are done modifying process list, so unblock signal */
840
976
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
841
977
NULL);
842
978
if(ret < 0){
843
979
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;
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;
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 */
1008
proc = proc->next;
864
1009
continue;
865
1010
}
866
1011
/* Before reading, make the process' data buffer large enough */
870
1015
if (proc->buffer == NULL){
871
1016
perror("malloc");
872
1017
exitstatus = EXIT_FAILURE;
873
goto end;
1018
goto fallback;
874
1019
}
875
1020
proc->buffer_size += BUFFER_SIZE;
876
1021
}
879
1024
BUFFER_SIZE);
880
1025
if(ret < 0){
881
1026
/* Read error from this process; ignore the error */
1027
proc = proc->next;
882
1028
continue;
883
1029
}
884
1030
if(ret == 0){
891
1037
}
892
1038
893
1039
894
end:
1040
fallback:
895
1041
896
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
897
/* Fallback if all plugins failed, none are found or an error occured */
1042
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1043
/* Fallback if all plugins failed, none are found or an error
1044
occured */
898
1045
bool bret;
899
1046
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
900
1047
char *passwordbuffer = getpass("Password: ");
901
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
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);
902
1055
if(not bret){
903
1056
perror("print_out_password");
904
1057
exitstatus = EXIT_FAILURE;
905
goto end;
906
1058
}
907
1059
}
908
1060
909
1061
/* 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
}
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);
922
1071
}
923
free(plugin_list->environ);
924
free(plugin_list);
1072
free(custom_argv);
925
1073
}
926
1074
927
1075
if(dir != NULL){
929
1077
}
930
1078
931
1079
/* 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");
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
}
939
1088
}
940
free(process_list->buffer);
941
free(process_list);
942
1089
}
943
1090
944
1091
/* Wait for any remaining child processes to terminate */
948
1095
if(errno != ECHILD){
949
1096
perror("wait");
950
1097
}
1098
1099
free_plugin_list();
1100
1101
free(plugindir);
1102
free(argfile);
951
1103
952
1104
return exitstatus;
953
1105
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0