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- Committer: Teddy Hogeborn
- Date: 2008-09-08 18:54:47 UTC
- Revision ID: teddy@fukt.bsnet.se-20080908185447-dm2ertwxa20qbckf
* INSTALL: Even better text.
- files added:
- .bzrignore
- 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
char *copy_name = strdup(name);
109
if(copy_name == NULL){
110
return NULL;
114
char *copy_name = NULL;
115
if(name != NULL){
116
copy_name = strdup(name);
117
if(copy_name == NULL){
118
return NULL;
119
}
111
120
}
112
121
113
122
*new_plugin = (plugin) { .name = copy_name,
114
123
.argc = 1,
115
.envc = 0,
116
124
.disabled = false,
117
.next = *plugin_list };
125
.next = plugin_list };
118
126
119
127
new_plugin->argv = malloc(sizeof(char *) * 2);
120
128
if (new_plugin->argv == NULL){
129
free(copy_name);
121
130
free(new_plugin);
122
131
return NULL;
123
132
}
124
133
new_plugin->argv[0] = copy_name;
125
134
new_plugin->argv[1] = NULL;
126
135
127
136
new_plugin->environ = malloc(sizeof(char *));
128
137
if(new_plugin->environ == NULL){
138
free(copy_name);
129
139
free(new_plugin->argv);
130
140
free(new_plugin);
131
141
return NULL;
132
142
}
133
143
new_plugin->environ[0] = NULL;
144
134
145
/* Append the new plugin to the list */
135
*plugin_list = new_plugin;
146
plugin_list = new_plugin;
136
147
return new_plugin;
137
148
}
138
149
168
179
}
169
180
170
181
/* Add to a plugin's environment */
171
static bool add_environment(plugin *p, const char *def){
182
static bool add_environment(plugin *p, const char *def, bool replace){
172
183
if(p == NULL){
173
184
return false;
174
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
}
175
203
return add_to_char_array(def, &(p->environ), &(p->envc));
176
204
}
177
205
178
179
206
/*
180
207
* Based on the example in the GNU LibC manual chapter 13.13 "File
181
208
* Descriptor Flags".
192
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
193
220
}
194
221
195
process *process_list = NULL;
196
222
197
/* Mark a process as completed when it exits, and save its exit
223
/* Mark processes as completed when they exit, and save their exit
198
224
status. */
199
225
void handle_sigchld(__attribute__((unused)) int sig){
200
process *proc = process_list;
201
int status;
202
pid_t pid = wait(&status);
203
if(pid == -1){
204
perror("wait");
205
return;
206
}
207
while(proc != NULL and proc->pid != pid){
208
proc = proc->next;
209
}
210
if(proc == NULL){
211
/* Process not found in process list */
212
return;
213
}
214
proc->status = status;
215
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
}
216
253
}
217
254
255
/* Prints out a password to stdout */
218
256
bool print_out_password(const char *buffer, size_t length){
219
257
ssize_t ret;
220
if(length>0 and buffer[length-1] == '\n'){
221
length--;
222
}
223
258
for(size_t written = 0; written < length; written += (size_t)ret){
224
259
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
225
260
length - written));
230
265
return true;
231
266
}
232
267
233
char **add_to_argv(char **argv, int *argc, char *arg){
234
if (argv == NULL){
235
*argc = 1;
236
argv = malloc(sizeof(char*) * 2);
237
if(argv == NULL){
238
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
}
239
292
}
240
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
241
argv[1] = NULL;
242
}
243
*argc += 1;
244
argv = realloc(argv, sizeof(char *)
245
* ((unsigned int) *argc + 1));
246
if(argv == NULL){
247
return NULL;
248
}
249
argv[*argc-1] = arg;
250
argv[*argc] = NULL;
251
return argv;
293
}
294
295
free(plugin_node);
252
296
}
253
297
254
static void free_plugin_list(plugin *plugin_list){
255
for(plugin *next = plugin_list; plugin_list != NULL; plugin_list = next){
256
next = plugin_list->next;
257
free(plugin_list->name);
258
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
259
free(*arg);
260
}
261
free(plugin_list->argv);
262
for(char **env = plugin_list->environ; *env != NULL; env++){
263
free(*env);
264
}
265
free(plugin_list->environ);
266
free(plugin_list);
267
}
298
static void free_plugin_list(void){
299
while(plugin_list != NULL){
300
free_plugin(plugin_list);
301
}
268
302
}
269
303
270
304
int main(int argc, char *argv[]){
271
const char *plugindir = "/lib/mandos/plugins.d";
272
const char *argfile = ARGFILE;
305
char *plugindir = NULL;
306
char *argfile = NULL;
273
307
FILE *conffp;
274
308
size_t d_name_len;
275
309
DIR *dir = NULL;
298
332
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
299
333
if(ret == -1){
300
334
perror("sigaction");
301
exitstatus = EXIT_FAILURE;
335
exitstatus = EXIT_FAILURE;
302
336
goto fallback;
303
337
}
304
338
307
341
{ .name = "global-options", .key = 'g',
308
342
.arg = "OPTION[,OPTION[,...]]",
309
343
.doc = "Options passed to all plugins" },
310
{ .name = "global-envs", .key = 'e',
344
{ .name = "global-env", .key = 'G',
311
345
.arg = "VAR=value",
312
346
.doc = "Environment variable passed to all plugins" },
313
347
{ .name = "options-for", .key = 'o',
314
348
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
315
349
.doc = "Options passed only to specified plugin" },
316
{ .name = "envs-for", .key = 'f',
350
{ .name = "env-for", .key = 'E',
317
351
.arg = "PLUGIN:ENV=value",
318
352
.doc = "Environment variable passed to specified plugin" },
319
353
{ .name = "disable", .key = 'd',
320
354
.arg = "PLUGIN",
321
355
.doc = "Disable a specific plugin", .group = 1 },
356
{ .name = "enable", .key = 'e',
357
.arg = "PLUGIN",
358
.doc = "Enable a specific plugin", .group = 1 },
322
359
{ .name = "plugin-dir", .key = 128,
323
360
.arg = "DIRECTORY",
324
361
.doc = "Specify a different plugin directory", .group = 2 },
325
{ .name = "userid", .key = 129,
326
.arg = "ID", .flags = 0,
327
.doc = "User ID the plugins will run as", .group = 2 },
328
{ .name = "groupid", .key = 130,
329
.arg = "ID", .flags = 0,
330
.doc = "Group ID the plugins will run as", .group = 2 },
331
{ .name = "debug", .key = 131,
332
.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 },
333
373
{ .name = NULL }
334
374
};
335
375
336
error_t parse_opt (int key, char *arg, struct argp_state *state) {
337
/* Get the INPUT argument from `argp_parse', which we know is a
338
pointer to our plugin list pointer. */
339
plugin **plugins = state->input;
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
340
378
switch (key) {
341
case 'g':
379
case 'g': /* --global-options */
342
380
if (arg != NULL){
343
381
char *p;
344
382
while((p = strsep(&arg, ",")) != NULL){
345
383
if(p[0] == '\0'){
346
384
continue;
347
385
}
348
if(not add_argument(getplugin(NULL, plugins), p)){
386
if(not add_argument(getplugin(NULL), p)){
349
387
perror("add_argument");
350
388
return ARGP_ERR_UNKNOWN;
351
389
}
352
390
}
353
391
}
354
392
break;
355
case 'e':
393
case 'G': /* --global-env */
356
394
if(arg == NULL){
357
395
break;
358
396
}
359
{
360
char *envdef = strdup(arg);
361
if(envdef == NULL){
362
break;
363
}
364
if(not add_environment(getplugin(NULL, plugins), envdef)){
365
perror("add_environment");
366
}
397
if(not add_environment(getplugin(NULL), arg, true)){
398
perror("add_environment");
367
399
}
368
400
break;
369
case 'o':
401
case 'o': /* --options-for */
370
402
if (arg != NULL){
371
403
char *p_name = strsep(&arg, ":");
372
if(p_name[0] == '\0'){
404
if(p_name[0] == '\0' or arg == NULL){
373
405
break;
374
406
}
375
407
char *opt = strsep(&arg, ":");
376
if(opt[0] == '\0'){
408
if(opt[0] == '\0' or opt == NULL){
377
409
break;
378
410
}
379
if(opt != NULL){
380
char *p;
381
while((p = strsep(&opt, ",")) != NULL){
382
if(p[0] == '\0'){
383
continue;
384
}
385
if(not add_argument(getplugin(p_name, plugins), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
388
}
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;
389
419
}
390
420
}
391
421
}
392
422
break;
393
case 'f':
423
case 'E': /* --env-for */
394
424
if(arg == NULL){
395
425
break;
396
426
}
399
429
if(envdef == NULL){
400
430
break;
401
431
}
402
char *p_name = strndup(arg, (size_t) (envdef-arg));
403
if(p_name == NULL){
404
break;
405
}
406
envdef++;
407
if(not add_environment(getplugin(p_name, plugins), envdef)){
432
*envdef = '\0';
433
if(not add_environment(getplugin(arg), envdef+1, true)){
408
434
perror("add_environment");
409
435
}
410
436
}
411
437
break;
412
case 'd':
438
case 'd': /* --disable */
413
439
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
440
plugin *p = getplugin(arg);
415
441
if(p == NULL){
416
442
return ARGP_ERR_UNKNOWN;
417
443
}
418
444
p->disabled = true;
419
445
}
420
446
break;
421
case 128:
422
plugindir = arg;
423
break;
424
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 */
425
467
uid = (uid_t)strtol(arg, NULL, 10);
426
468
break;
427
case 130:
469
case 131: /* --groupid */
428
470
gid = (gid_t)strtol(arg, NULL, 10);
429
471
break;
430
case 131:
472
case 132: /* --debug */
431
473
debug = true;
432
474
break;
433
475
case ARGP_KEY_ARG:
434
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
435
break;
436
case ARGP_KEY_END:
437
break;
438
default:
439
return ARGP_ERR_UNKNOWN;
440
}
441
return 0;
442
}
443
444
plugin *plugin_list = NULL;
445
446
struct argp argp = { .options = options, .parser = parse_opt,
447
.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 = "",
448
527
.doc = "Mandos plugin runner -- Run plugins" };
449
528
450
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);
451
532
if (ret == ARGP_ERR_UNKNOWN){
452
533
fprintf(stderr, "Unknown error while parsing arguments\n");
453
534
exitstatus = EXIT_FAILURE;
454
535
goto fallback;
455
536
}
456
457
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
}
458
547
if(conffp != NULL){
459
548
char *org_line = NULL;
460
549
char *p, *arg, *new_arg, *line;
463
552
const char whitespace_delims[] = " \r\t\f\v\n";
464
553
const char comment_delim[] = "#";
465
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 */
466
567
while(true){
467
568
sret = getline(&org_line, &size, conffp);
468
569
if(sret == -1){
476
577
continue;
477
578
}
478
579
new_arg = strdup(p);
479
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
480
if (custom_argv == NULL){
481
perror("add_to_argv");
482
exitstatus = EXIT_FAILURE;
483
goto fallback;
484
}
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;
485
598
}
486
599
}
487
600
free(org_line);
488
} else{
601
} else {
489
602
/* Check for harmful errors and go to fallback. Other errors might
490
603
not affect opening plugins */
491
604
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
494
607
goto fallback;
495
608
}
496
609
}
497
610
/* If there was any arguments from configuration file,
611
pass them to parser as command arguments */
498
612
if(custom_argv != NULL){
499
custom_argv[0] = argv[0];
500
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);
501
615
if (ret == ARGP_ERR_UNKNOWN){
502
616
fprintf(stderr, "Unknown error while parsing arguments\n");
503
617
exitstatus = EXIT_FAILURE;
505
619
}
506
620
}
507
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
508
631
if(debug){
509
632
for(plugin *p = plugin_list; p != NULL; p=p->next){
510
633
fprintf(stderr, "Plugin: %s has %d arguments\n",
519
642
}
520
643
}
521
644
645
/* Strip permissions down to nobody */
522
646
ret = setuid(uid);
523
647
if (ret == -1){
524
648
perror("setuid");
525
}
526
649
}
527
650
setgid(gid);
528
651
if (ret == -1){
529
652
perror("setgid");
530
653
}
531
654
532
dir = opendir(plugindir);
655
if (plugindir == NULL){
656
dir = opendir(PDIR);
657
} else {
658
dir = opendir(plugindir);
659
}
660
533
661
if(dir == NULL){
534
662
perror("Could not open plugin dir");
535
663
exitstatus = EXIT_FAILURE;
551
679
552
680
FD_ZERO(&rfds_all);
553
681
682
/* Read and execute any executable in the plugin directory*/
554
683
while(true){
555
684
dirst = readdir(dir);
556
685
557
// All directory entries have been processed
686
/* All directory entries have been processed */
558
687
if(dirst == NULL){
559
688
if (errno == EBADF){
560
689
perror("readdir");
566
695
567
696
d_name_len = strlen(dirst->d_name);
568
697
569
// Ignore dotfiles, backup files and other junk
698
/* Ignore dotfiles, backup files and other junk */
570
699
{
571
700
bool bad_name = false;
572
701
587
716
break;
588
717
}
589
718
}
590
591
719
if(bad_name){
592
720
continue;
593
721
}
594
595
722
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
596
723
size_t suf_len = strlen(*suf);
597
724
if((d_name_len >= suf_len)
612
739
}
613
740
614
741
char *filename;
615
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
}
616
747
if(ret < 0){
617
748
perror("asprintf");
618
749
continue;
624
755
free(filename);
625
756
continue;
626
757
}
627
758
759
/* Ignore non-executable files */
628
760
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
629
761
if(debug){
630
762
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
633
765
free(filename);
634
766
continue;
635
767
}
636
plugin *p = getplugin(dirst->d_name, &plugin_list);
768
769
plugin *p = getplugin(dirst->d_name);
637
770
if(p == NULL){
638
771
perror("getplugin");
639
772
free(filename);
649
782
}
650
783
{
651
784
/* Add global arguments to argument list for this plugin */
652
plugin *g = getplugin(NULL, &plugin_list);
785
plugin *g = getplugin(NULL);
653
786
if(g != NULL){
654
787
for(char **a = g->argv + 1; *a != NULL; a++){
655
788
if(not add_argument(p, *a)){
658
791
}
659
792
/* Add global environment variables */
660
793
for(char **e = g->environ; *e != NULL; e++){
661
if(not add_environment(p, *e)){
794
if(not add_environment(p, *e, false)){
662
795
perror("add_environment");
663
796
}
664
797
}
669
802
process, too. */
670
803
if(p->environ[0] != NULL){
671
804
for(char **e = environ; *e != NULL; e++){
672
char *copy = strdup(*e);
673
if(copy == NULL){
674
perror("strdup");
675
continue;
676
}
677
if(not add_environment(p, copy)){
805
if(not add_environment(p, *e, false)){
678
806
perror("add_environment");
679
807
}
680
808
}
681
809
}
682
810
683
int pipefd[2];
811
int pipefd[2];
684
812
ret = pipe(pipefd);
685
813
if (ret == -1){
686
814
perror("pipe");
687
815
exitstatus = EXIT_FAILURE;
688
816
goto fallback;
689
817
}
818
/* Ask OS to automatic close the pipe on exec */
690
819
ret = set_cloexec_flag(pipefd[0]);
691
820
if(ret < 0){
692
821
perror("set_cloexec_flag");
706
835
exitstatus = EXIT_FAILURE;
707
836
goto fallback;
708
837
}
709
// Starting a new process to be watched
838
/* Starting a new process to be watched */
710
839
pid_t pid = fork();
711
840
if(pid == -1){
712
841
perror("fork");
750
879
}
751
880
/* no return */
752
881
}
753
/* parent process */
882
/* Parent process */
883
close(pipefd[1]); /* Close unused write end of pipe */
754
884
free(filename);
755
close(pipefd[1]); /* close unused write end of pipe */
756
process *new_process = malloc(sizeof(process));
757
if (new_process == NULL){
758
perror("malloc");
885
plugin *new_plugin = getplugin(dirst->d_name);
886
if (new_plugin == NULL){
887
perror("getplugin");
759
888
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
760
889
if(ret < 0){
761
perror("sigprocmask");
890
perror("sigprocmask");
762
891
}
763
892
exitstatus = EXIT_FAILURE;
764
893
goto fallback;
765
894
}
766
895
767
*new_process = (struct process){ .pid = pid,
768
.fd = pipefd[0],
769
.next = process_list };
770
// List handling
771
process_list = new_process;
896
new_plugin->pid = pid;
897
new_plugin->fd = pipefd[0];
898
772
899
/* Unblock SIGCHLD so signal handler can be run if this process
773
900
has already completed */
774
901
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
778
905
goto fallback;
779
906
}
780
907
781
FD_SET(new_process->fd, &rfds_all);
908
FD_SET(new_plugin->fd, &rfds_all);
782
909
783
if (maxfd < new_process->fd){
784
maxfd = new_process->fd;
910
if (maxfd < new_plugin->fd){
911
maxfd = new_plugin->fd;
785
912
}
786
913
787
914
}
788
915
789
free_plugin_list(plugin_list);
790
791
916
closedir(dir);
792
917
dir = NULL;
793
794
if (process_list == NULL){
795
fprintf(stderr, "No plugin processes started. Incorrect plugin"
796
" directory?\n");
797
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
}
798
928
}
799
while(process_list){
929
930
/* Main loop while running plugins exist */
931
while(plugin_list){
800
932
fd_set rfds = rfds_all;
801
933
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
802
934
if (select_ret == -1){
806
938
}
807
939
/* OK, now either a process completed, or something can be read
808
940
from one of them */
809
for(process *proc = process_list; proc ; proc = proc->next){
941
for(plugin *proc = plugin_list; proc != NULL;){
810
942
/* Is this process completely done? */
811
943
if(proc->eof and proc->completed){
812
944
/* Only accept the plugin output if it exited cleanly */
813
945
if(not WIFEXITED(proc->status)
814
946
or WEXITSTATUS(proc->status) != 0){
815
947
/* Bad exit by plugin */
948
816
949
if(debug){
817
950
if(WIFEXITED(proc->status)){
818
951
fprintf(stderr, "Plugin %u exited with status %d\n",
827
960
(unsigned int) (proc->pid));
828
961
}
829
962
}
963
830
964
/* Remove the plugin */
831
965
FD_CLR(proc->fd, &rfds_all);
966
832
967
/* Block signal while modifying process_list */
833
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
968
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
834
969
if(ret < 0){
835
970
perror("sigprocmask");
836
971
exitstatus = EXIT_FAILURE;
837
972
goto fallback;
838
973
}
839
/* Delete this process entry from the list */
840
if(process_list == proc){
841
/* First one - simple */
842
process_list = proc->next;
843
} else {
844
/* Second one or later */
845
for(process *p = process_list; p != NULL; p = p->next){
846
if(p->next == proc){
847
p->next = proc->next;
848
break;
849
}
850
}
851
}
974
852
975
/* We are done modifying process list, so unblock signal */
853
976
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
854
977
NULL);
855
978
if(ret < 0){
856
979
perror("sigprocmask");
857
}
858
free(proc->buffer);
859
free(proc);
860
/* We deleted this process from the list, so we can't go
861
proc->next. Therefore, start over from the beginning of
862
the process list */
863
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;
864
992
}
993
865
994
/* This process exited nicely, so print its buffer */
866
995
867
bool bret = print_out_password(proc->buffer, proc->buffer_length);
996
bool bret = print_out_password(proc->buffer,
997
proc->buffer_length);
868
998
if(not bret){
869
999
perror("print_out_password");
870
1000
exitstatus = EXIT_FAILURE;
871
1001
}
872
1002
goto fallback;
873
1003
}
1004
874
1005
/* This process has not completed. Does it have any output? */
875
1006
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
876
1007
/* This process had nothing to say at this time */
1008
proc = proc->next;
877
1009
continue;
878
1010
}
879
1011
/* Before reading, make the process' data buffer large enough */
892
1024
BUFFER_SIZE);
893
1025
if(ret < 0){
894
1026
/* Read error from this process; ignore the error */
1027
proc = proc->next;
895
1028
continue;
896
1029
}
897
1030
if(ret == 0){
906
1039
907
1040
fallback:
908
1041
909
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
910
/* 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 */
911
1045
bool bret;
912
1046
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
913
1047
char *passwordbuffer = getpass("Password: ");
914
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);
915
1055
if(not bret){
916
1056
perror("print_out_password");
917
1057
exitstatus = EXIT_FAILURE;
926
1066
}
927
1067
928
1068
if(custom_argv != NULL){
929
for(char **arg = custom_argv; *arg != NULL; arg++){
1069
for(char **arg = custom_argv+1; *arg != NULL; arg++){
930
1070
free(*arg);
931
1071
}
932
1072
free(custom_argv);
933
1073
}
934
free_plugin_list(plugin_list);
935
1074
936
1075
if(dir != NULL){
937
1076
closedir(dir);
938
1077
}
939
1078
940
1079
/* Free the process list and kill the processes */
941
for(process *next; process_list != NULL; process_list = next){
942
next = process_list->next;
943
close(process_list->fd);
944
ret = kill(process_list->pid, SIGTERM);
945
if(ret == -1 and errno != ESRCH){
946
/* set-uid proccesses migth not get closed */
947
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
}
948
1088
}
949
free(process_list->buffer);
950
free(process_list);
951
1089
}
952
1090
953
1091
/* Wait for any remaining child processes to terminate */
957
1095
if(errno != ECHILD){
958
1096
perror("wait");
959
1097
}
1098
1099
free_plugin_list();
1100
1101
free(plugindir);
1102
free(argfile);
960
1103
961
1104
return exitstatus;
962
1105
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0