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- Committer: Teddy Hogeborn
- Date: 2008-08-14 02:29:36 UTC
- mfrom: (24.1.50 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080814022936-ook77vj8i1a42msu
Merge.
* Makefile (OPTIMIZE): Uncommented again.
* Makefile (OPTIMIZE): Uncommented again.
- files added:
- network-protocol.txt
- files removed:
- .bzrignore
- files modified:
- Makefile
added
removed
plugin-runner.c
21
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
22
*/
23
23
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
26
26
#include <stddef.h> /* size_t, NULL */
27
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
28
EXIT_SUCCESS, realloc() */
51
51
close() */
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
54
#include <string.h> /* strsep, strlen(), strcpy(),
55
strcat() */
55
56
#include <errno.h> /* errno */
56
57
#include <argp.h> /* struct argp_option, struct
57
58
argp_state, struct argp,
58
59
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
error_t */
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
61
61
#include <signal.h> /* struct sigaction, sigemptyset(),
62
62
sigaddset(), sigaction(),
63
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
66
66
67
67
#define BUFFER_SIZE 256
68
68
69
#define PDIR "/lib/mandos/plugins.d"
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
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;
76
77
typedef struct plugin{
78
char *name; /* can be NULL or any plugin name */
79
char **argv;
80
int argc;
81
char **environ;
82
int envc;
83
bool disabled;
84
85
/* Variables used for running processes*/
72
struct process;
73
74
typedef struct process{
86
75
pid_t pid;
87
76
int fd;
88
77
char *buffer;
89
78
size_t buffer_size;
90
79
size_t buffer_length;
91
80
bool eof;
92
volatile bool completed;
93
volatile int status;
81
bool completed;
82
int status;
83
struct process *next;
84
} process;
85
86
typedef struct plugin{
87
char *name; /* can be NULL or any plugin name */
88
char **argv;
89
int argc;
90
bool disabled;
94
91
struct plugin *next;
95
92
} plugin;
96
93
97
static plugin *plugin_list = NULL;
98
99
/* Gets a 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){
94
static plugin *getplugin(char *name, plugin **plugin_list){
95
for (plugin *p = *plugin_list; p != NULL; p = p->next){
104
96
if ((p->name == name)
105
97
or (p->name and name and (strcmp(p->name, name) == 0))){
106
98
return p;
109
101
/* Create a new plugin */
110
102
plugin *new_plugin = malloc(sizeof(plugin));
111
103
if (new_plugin == NULL){
112
return NULL;
113
}
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,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
126
104
perror("malloc");
105
exit(EXIT_FAILURE);
106
}
107
new_plugin->name = name;
127
108
new_plugin->argv = malloc(sizeof(char *) * 2);
128
109
if (new_plugin->argv == NULL){
129
free(copy_name);
130
free(new_plugin);
131
return NULL;
110
perror("malloc");
111
exit(EXIT_FAILURE);
132
112
}
133
new_plugin->argv[0] = copy_name;
113
new_plugin->argv[0] = name;
134
114
new_plugin->argv[1] = NULL;
135
136
new_plugin->environ = malloc(sizeof(char *));
137
if(new_plugin->environ == NULL){
138
free(copy_name);
139
free(new_plugin->argv);
140
free(new_plugin);
141
return NULL;
142
}
143
new_plugin->environ[0] = NULL;
144
115
new_plugin->argc = 1;
116
new_plugin->disabled = false;
117
new_plugin->next = *plugin_list;
145
118
/* Append the new plugin to the list */
146
plugin_list = new_plugin;
119
*plugin_list = new_plugin;
147
120
return new_plugin;
148
121
}
149
122
150
/* Helper function for add_argument and add_environment */
151
static bool add_to_char_array(const char *new, char ***array,
152
int *len){
153
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
156
/* Malloc check */
157
if(*array == NULL){
158
return false;
159
}
160
/* Make a copy of the new string */
161
char *copy = strdup(new);
162
if(copy == NULL){
163
return false;
164
}
165
/* Insert the copy */
166
(*array)[*len] = copy;
167
(*len)++;
168
/* Add a new terminating NULL pointer to the last element */
169
(*array)[*len] = NULL;
170
return true;
171
}
172
173
/* Add to a plugin's argument vector */
174
static bool add_argument(plugin *p, const char *arg){
175
if(p == NULL){
176
return false;
177
}
178
return add_to_char_array(arg, &(p->argv), &(p->argc));
179
}
180
181
/* Add to a plugin's environment */
182
static bool add_environment(plugin *p, const char *def, bool replace){
183
if(p == NULL){
184
return false;
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));
194
if(new == NULL){
195
return false;
196
}
197
*e = new;
198
strcpy(*e, def);
199
}
200
return true;
201
}
202
}
203
return add_to_char_array(def, &(p->environ), &(p->envc));
123
static void addargument(plugin *p, char *arg){
124
p->argv[p->argc] = arg;
125
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
126
if (p->argv == NULL){
127
perror("malloc");
128
exit(EXIT_FAILURE);
129
}
130
p->argc++;
131
p->argv[p->argc] = NULL;
204
132
}
205
133
206
134
/*
219
147
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
220
148
}
221
149
150
process *process_list = NULL;
222
151
223
/* Mark processes as completed when they exit, and save their exit
152
/* Mark a process as completed when it exits, and save its exit
224
153
status. */
225
154
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
}
155
process *proc = process_list;
156
int status;
157
pid_t pid = wait(&status);
158
if(pid == -1){
159
perror("wait");
160
return;
161
}
162
while(proc != NULL and proc->pid != pid){
163
proc = proc->next;
164
}
165
if(proc == NULL){
166
/* Process not found in process list */
167
return;
168
}
169
proc->status = status;
170
proc->completed = true;
253
171
}
254
172
255
/* Prints out a password to stdout */
256
173
bool print_out_password(const char *buffer, size_t length){
257
174
ssize_t ret;
258
175
if(length>0 and buffer[length-1] == '\n'){
268
185
return true;
269
186
}
270
187
271
/* Removes and free a plugin from the plugin list */
272
static void free_plugin(plugin *plugin_node){
273
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
275
free(*arg);
276
}
277
free(plugin_node->argv);
278
for(char **env = plugin_node->environ; *env != NULL; env++){
279
free(*env);
280
}
281
free(plugin_node->environ);
282
free(plugin_node->buffer);
283
284
/* Removes the plugin from the singly-linked list */
285
if(plugin_node == plugin_list){
286
/* First one - simple */
287
plugin_list = plugin_list->next;
288
} else {
289
/* Second one or later */
290
for(plugin *p = plugin_list; p != NULL; p = p->next){
291
if(p->next == plugin_node){
292
p->next = plugin_node->next;
293
break;
294
}
295
}
296
}
297
298
free(plugin_node);
299
}
300
301
static void free_plugin_list(void){
302
while(plugin_list != NULL){
303
free_plugin(plugin_list);
304
}
305
}
306
307
188
int main(int argc, char *argv[]){
308
char *plugindir = NULL;
309
char *argfile = NULL;
310
FILE *conffp;
189
const char *plugindir = "/lib/mandos/plugins.d";
311
190
size_t d_name_len;
312
191
DIR *dir = NULL;
313
192
struct dirent *dirst;
321
200
struct sigaction old_sigchld_action;
322
201
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
323
202
.sa_flags = SA_NOCLDSTOP };
324
char **custom_argv = NULL;
325
int custom_argc = 0;
326
203
char *plus_options = NULL;
204
char **plus_argv = NULL;
205
327
206
/* Establish a signal handler */
328
207
sigemptyset(&sigchld_action.sa_mask);
329
208
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
330
if(ret == -1){
209
if(ret < 0){
331
210
perror("sigaddset");
332
exitstatus = EXIT_FAILURE;
333
goto fallback;
211
exit(EXIT_FAILURE);
334
212
}
335
213
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
336
if(ret == -1){
214
if(ret < 0){
337
215
perror("sigaction");
338
exitstatus = EXIT_FAILURE;
339
goto fallback;
216
exit(EXIT_FAILURE);
340
217
}
341
218
342
219
/* The options we understand. */
344
221
{ .name = "global-options", .key = 'g',
345
222
.arg = "OPTION[,OPTION[,...]]",
346
223
.doc = "Options passed to all plugins" },
347
{ .name = "global-env", .key = 'G',
348
.arg = "VAR=value",
349
.doc = "Environment variable passed to all plugins" },
350
224
{ .name = "options-for", .key = 'o',
351
225
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
352
226
.doc = "Options passed only to specified plugin" },
353
{ .name = "env-for", .key = 'E',
354
.arg = "PLUGIN:ENV=value",
355
.doc = "Environment variable passed to specified plugin" },
356
227
{ .name = "disable", .key = 'd',
357
228
.arg = "PLUGIN",
358
229
.doc = "Disable a specific plugin", .group = 1 },
359
{ .name = "enable", .key = 'e',
360
.arg = "PLUGIN",
361
.doc = "Enable a specific plugin", .group = 1 },
362
230
{ .name = "plugin-dir", .key = 128,
363
231
.arg = "DIRECTORY",
364
232
.doc = "Specify a different plugin directory", .group = 2 },
365
{ .name = "config-file", .key = 129,
366
.arg = "FILE",
367
.doc = "Specify a different configuration file", .group = 2 },
368
{ .name = "userid", .key = 130,
369
.arg = "ID", .flags = 0,
370
.doc = "User ID the plugins will run as", .group = 3 },
371
{ .name = "groupid", .key = 131,
372
.arg = "ID", .flags = 0,
373
.doc = "Group ID the plugins will run as", .group = 3 },
374
{ .name = "debug", .key = 132,
375
.doc = "Debug mode", .group = 4 },
233
{ .name = "userid", .key = 129,
234
.arg = "ID", .flags = 0,
235
.doc = "User ID the plugins will run as", .group = 2 },
236
{ .name = "groupid", .key = 130,
237
.arg = "ID", .flags = 0,
238
.doc = "Group ID the plugins will run as", .group = 2 },
239
{ .name = "debug", .key = 131,
240
.doc = "Debug mode", .group = 3 },
376
241
{ .name = NULL }
377
242
};
378
243
379
error_t parse_opt (int key, char *arg, __attribute__((unused))
380
struct argp_state *state) {
244
error_t parse_opt (int key, char *arg, struct argp_state *state) {
245
/* Get the INPUT argument from `argp_parse', which we know is a
246
pointer to our plugin list pointer. */
247
plugin **plugins = state->input;
381
248
switch (key) {
382
case 'g': /* --global-options */
249
case 'g':
383
250
if (arg != NULL){
384
251
char *p;
385
252
while((p = strsep(&arg, ",")) != NULL){
386
if(p[0] == '\0'){
253
if(strcmp(p, "") == 0){
387
254
continue;
388
255
}
389
if(not add_argument(getplugin(NULL), p)){
390
perror("add_argument");
391
return ARGP_ERR_UNKNOWN;
392
}
393
}
394
}
395
break;
396
case 'G': /* --global-env */
397
if(arg == NULL){
398
break;
399
}
400
{
401
char *envdef = strdup(arg);
402
if(envdef == NULL){
403
break;
404
}
405
if(not add_environment(getplugin(NULL), envdef, true)){
406
perror("add_environment");
407
}
408
}
409
break;
410
case 'o': /* --options-for */
256
addargument(getplugin(NULL, plugins), p);
257
}
258
}
259
break;
260
case 'o':
411
261
if (arg != NULL){
412
char *p_name = strsep(&arg, ":");
413
if(p_name[0] == '\0'){
262
char *name = strsep(&arg, ":");
263
if(strcmp(name, "") == 0){
414
264
break;
415
265
}
416
266
char *opt = strsep(&arg, ":");
417
if(opt[0] == '\0'){
267
if(strcmp(opt, "") == 0){
418
268
break;
419
269
}
420
270
if(opt != NULL){
421
271
char *p;
422
272
while((p = strsep(&opt, ",")) != NULL){
423
if(p[0] == '\0'){
273
if(strcmp(p, "") == 0){
424
274
continue;
425
275
}
426
if(not add_argument(getplugin(p_name), p)){
427
perror("add_argument");
428
return ARGP_ERR_UNKNOWN;
429
}
276
addargument(getplugin(name, plugins), p);
430
277
}
431
278
}
432
279
}
433
280
break;
434
case 'E': /* --env-for */
435
if(arg == NULL){
436
break;
437
}
438
{
439
char *envdef = strchr(arg, ':');
440
if(envdef == NULL){
441
break;
442
}
443
char *p_name = strndup(arg, (size_t) (envdef-arg));
444
if(p_name == NULL){
445
break;
446
}
447
envdef++;
448
if(not add_environment(getplugin(p_name), envdef, true)){
449
perror("add_environment");
450
}
451
}
452
break;
453
case 'd': /* --disable */
454
if (arg != NULL){
455
plugin *p = getplugin(arg);
456
if(p == NULL){
457
return ARGP_ERR_UNKNOWN;
458
}
459
p->disabled = true;
460
}
461
break;
462
case 'e': /* --enable */
463
if (arg != NULL){
464
plugin *p = getplugin(arg);
465
if(p == NULL){
466
return ARGP_ERR_UNKNOWN;
467
}
468
p->disabled = false;
469
}
470
break;
471
case 128: /* --plugin-dir */
472
plugindir = strdup(arg);
473
if(plugindir == NULL){
474
perror("strdup");
475
}
476
break;
477
case 129: /* --config-file */
478
/* This is already done by parse_opt_config_file() */
479
break;
480
case 130: /* --userid */
281
case 'd':
282
if (arg != NULL){
283
getplugin(arg, plugins)->disabled = true;
284
}
285
break;
286
case 128:
287
plugindir = arg;
288
break;
289
case 129:
481
290
uid = (uid_t)strtol(arg, NULL, 10);
482
291
break;
483
case 131: /* --groupid */
292
case 130:
484
293
gid = (gid_t)strtol(arg, NULL, 10);
485
294
break;
486
case 132: /* --debug */
295
case 131:
487
296
debug = true;
488
297
break;
489
298
case ARGP_KEY_ARG:
490
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
491
break;
492
case ARGP_KEY_END:
493
break;
494
default:
495
return ARGP_ERR_UNKNOWN;
496
}
497
return 0;
498
}
499
500
/* This option parser is the same as parse_opt() above, except it
501
ignores everything but the --config-file option. */
502
error_t parse_opt_config_file (int key, char *arg,
503
__attribute__((unused))
504
struct argp_state *state) {
505
switch (key) {
506
case 'g': /* --global-options */
507
case 'G': /* --global-env */
508
case 'o': /* --options-for */
509
case 'E': /* --env-for */
510
case 'd': /* --disable */
511
case 'e': /* --enable */
512
case 128: /* --plugin-dir */
513
break;
514
case 129: /* --config-file */
515
argfile = strdup(arg);
516
if(argfile == NULL){
517
perror("strdup");
299
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
300
argp_usage (state);
518
301
}
519
break;
520
case 130: /* --userid */
521
case 131: /* --groupid */
522
case 132: /* --debug */
523
case ARGP_KEY_ARG:
302
plus_options = arg;
303
break;
524
304
case ARGP_KEY_END:
525
305
break;
526
306
default:
529
309
return 0;
530
310
}
531
311
532
struct argp argp = { .options = options,
533
.parser = parse_opt_config_file,
534
.args_doc = "",
312
plugin *plugin_list = NULL;
313
314
struct argp argp = { .options = options, .parser = parse_opt,
315
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
535
316
.doc = "Mandos plugin runner -- Run plugins" };
536
317
537
/* Parse using the parse_opt_config_file in order to get the custom
538
config file location, if any. */
539
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
318
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
540
319
if (ret == ARGP_ERR_UNKNOWN){
541
320
fprintf(stderr, "Unknown error while parsing arguments\n");
542
321
exitstatus = EXIT_FAILURE;
543
goto fallback;
322
goto end;
544
323
}
545
324
546
/* Reset to the normal argument parser */
547
argp.parser = parse_opt;
548
549
/* Open the configfile if available */
550
if (argfile == NULL){
551
conffp = fopen(AFILE, "r");
552
} else {
553
conffp = fopen(argfile, "r");
554
}
555
if(conffp != NULL){
556
char *org_line = NULL;
557
char *p, *arg, *new_arg, *line;
558
size_t size = 0;
559
ssize_t sret;
560
const char whitespace_delims[] = " \r\t\f\v\n";
561
const char comment_delim[] = "#";
562
563
custom_argc = 1;
564
custom_argv = malloc(sizeof(char*) * 2);
565
if(custom_argv == NULL){
325
if(plus_options){
326
/* This is a mangled argument in the form of
327
"+--option+--other-option=parameter+--yet-another-option", etc */
328
/* Make new argc and argv vars, and call argp_parse() again. */
329
plus_options++; /* skip the first '+' character */
330
const char delims[] = "+";
331
char *arg;
332
int new_argc = 1;
333
plus_argv = malloc(sizeof(char*) * 2);
334
if(plus_argv == NULL){
566
335
perror("malloc");
567
336
exitstatus = EXIT_FAILURE;
568
goto fallback;
569
}
570
custom_argv[0] = argv[0];
571
custom_argv[1] = NULL;
572
573
/* for each line in the config file, strip whitespace and ignore
574
commented text */
575
while(true){
576
sret = getline(&org_line, &size, conffp);
577
if(sret == -1){
578
break;
579
}
580
581
line = org_line;
582
arg = strsep(&line, comment_delim);
583
while((p = strsep(&arg, whitespace_delims)) != NULL){
584
if(p[0] == '\0'){
585
continue;
586
}
587
new_arg = strdup(p);
588
if(new_arg == NULL){
589
perror("strdup");
590
exitstatus = EXIT_FAILURE;
591
free(org_line);
592
goto fallback;
593
}
594
595
custom_argc += 1;
596
custom_argv = realloc(custom_argv, sizeof(char *)
597
* ((unsigned int) custom_argc + 1));
598
if(custom_argv == NULL){
599
perror("realloc");
600
exitstatus = EXIT_FAILURE;
601
free(org_line);
602
goto fallback;
603
}
604
custom_argv[custom_argc-1] = new_arg;
605
custom_argv[custom_argc] = NULL;
606
}
607
}
608
free(org_line);
609
} else {
610
/* Check for harmful errors and go to fallback. Other errors might
611
not affect opening plugins */
612
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
613
perror("fopen");
614
exitstatus = EXIT_FAILURE;
615
goto fallback;
616
}
617
}
618
/* If there was any arguments from configuration file,
619
pass them to parser as command arguments */
620
if(custom_argv != NULL){
621
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
622
0, NULL);
337
goto end;
338
}
339
plus_argv[0] = argv[0];
340
plus_argv[1] = NULL;
341
342
while((arg = strsep(&plus_options, delims)) != NULL){
343
new_argc++;
344
plus_argv = realloc(plus_argv, sizeof(char *)
345
* ((unsigned int) new_argc + 1));
346
if(plus_argv == NULL){
347
perror("realloc");
348
exitstatus = EXIT_FAILURE;
349
goto end;
350
}
351
plus_argv[new_argc-1] = arg;
352
plus_argv[new_argc] = NULL;
353
}
354
355
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
623
356
if (ret == ARGP_ERR_UNKNOWN){
624
357
fprintf(stderr, "Unknown error while parsing arguments\n");
625
358
exitstatus = EXIT_FAILURE;
626
goto fallback;
359
goto end;
627
360
}
628
361
}
629
362
630
/* Parse actual command line arguments, to let them override the
631
config file */
632
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
633
if (ret == ARGP_ERR_UNKNOWN){
634
fprintf(stderr, "Unknown error while parsing arguments\n");
635
exitstatus = EXIT_FAILURE;
636
goto fallback;
637
}
638
639
363
if(debug){
640
364
for(plugin *p = plugin_list; p != NULL; p=p->next){
641
365
fprintf(stderr, "Plugin: %s has %d arguments\n",
643
367
for(char **a = p->argv; *a != NULL; a++){
644
368
fprintf(stderr, "\tArg: %s\n", *a);
645
369
}
646
fprintf(stderr, "...and %u environment variables\n", p->envc);
647
for(char **a = p->environ; *a != NULL; a++){
648
fprintf(stderr, "\t%s\n", *a);
649
}
650
370
}
651
371
}
652
372
653
/* Strip permissions down to nobody */
654
373
ret = setuid(uid);
655
374
if (ret == -1){
656
375
perror("setuid");
657
}
376
}
377
658
378
setgid(gid);
659
379
if (ret == -1){
660
380
perror("setgid");
661
381
}
662
382
663
if (plugindir == NULL){
664
dir = opendir(PDIR);
665
} else {
666
dir = opendir(plugindir);
667
}
668
383
dir = opendir(plugindir);
669
384
if(dir == NULL){
670
385
perror("Could not open plugin dir");
671
386
exitstatus = EXIT_FAILURE;
672
goto fallback;
387
goto end;
673
388
}
674
389
675
390
/* Set the FD_CLOEXEC flag on the directory, if possible */
680
395
if(ret < 0){
681
396
perror("set_cloexec_flag");
682
397
exitstatus = EXIT_FAILURE;
683
goto fallback;
398
goto end;
684
399
}
685
400
}
686
401
}
687
402
688
403
FD_ZERO(&rfds_all);
689
404
690
/* Read and execute any executable in the plugin directory*/
691
405
while(true){
692
406
dirst = readdir(dir);
693
407
694
/* All directory entries have been processed */
408
// All directory entries have been processed
695
409
if(dirst == NULL){
696
410
if (errno == EBADF){
697
411
perror("readdir");
698
412
exitstatus = EXIT_FAILURE;
699
goto fallback;
413
goto end;
700
414
}
701
415
break;
702
416
}
703
417
704
418
d_name_len = strlen(dirst->d_name);
705
419
706
/* Ignore dotfiles, backup files and other junk */
420
// Ignore dotfiles, backup files and other junk
707
421
{
708
422
bool bad_name = false;
709
423
724
438
break;
725
439
}
726
440
}
441
727
442
if(bad_name){
728
443
continue;
729
444
}
445
730
446
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
731
447
size_t suf_len = strlen(*suf);
732
448
if((d_name_len >= suf_len)
745
461
continue;
746
462
}
747
463
}
748
749
char *filename;
750
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
751
if(ret < 0){
752
perror("asprintf");
464
465
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
466
if (filename == NULL){
467
perror("malloc");
753
468
continue;
754
469
}
470
strcpy(filename, plugindir); /* Spurious warning */
471
strcat(filename, "/"); /* Spurious warning */
472
strcat(filename, dirst->d_name); /* Spurious warning */
755
473
756
474
ret = stat(filename, &st);
757
475
if (ret == -1){
759
477
free(filename);
760
478
continue;
761
479
}
762
763
/* Ignore non-executable files */
480
764
481
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
765
482
if(debug){
766
483
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
769
486
free(filename);
770
487
continue;
771
488
}
772
773
plugin *p = getplugin(dirst->d_name);
774
if(p == NULL){
775
perror("getplugin");
776
free(filename);
777
continue;
778
}
779
if(p->disabled){
489
if(getplugin(dirst->d_name, &plugin_list)->disabled){
780
490
if(debug){
781
491
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
782
492
dirst->d_name);
784
494
free(filename);
785
495
continue;
786
496
}
497
plugin *p = getplugin(dirst->d_name, &plugin_list);
787
498
{
788
499
/* Add global arguments to argument list for this plugin */
789
plugin *g = getplugin(NULL);
790
if(g != NULL){
791
for(char **a = g->argv + 1; *a != NULL; a++){
792
if(not add_argument(p, *a)){
793
perror("add_argument");
794
}
795
}
796
/* Add global environment variables */
797
for(char **e = g->environ; *e != NULL; e++){
798
if(not add_environment(p, *e, false)){
799
perror("add_environment");
800
}
801
}
802
}
803
}
804
/* If this plugin has any environment variables, we will call
805
using execve and need to duplicate the environment from this
806
process, too. */
807
if(p->environ[0] != NULL){
808
for(char **e = environ; *e != NULL; e++){
809
if(not add_environment(p, *e, false)){
810
perror("add_environment");
811
}
812
}
813
}
814
815
int pipefd[2];
500
plugin *g = getplugin(NULL, &plugin_list);
501
for(char **a = g->argv + 1; *a != NULL; a++){
502
addargument(p, *a);
503
}
504
}
505
int pipefd[2];
816
506
ret = pipe(pipefd);
817
507
if (ret == -1){
818
508
perror("pipe");
819
509
exitstatus = EXIT_FAILURE;
820
goto fallback;
510
goto end;
821
511
}
822
/* Ask OS to automatic close the pipe on exec */
823
512
ret = set_cloexec_flag(pipefd[0]);
824
513
if(ret < 0){
825
514
perror("set_cloexec_flag");
826
515
exitstatus = EXIT_FAILURE;
827
goto fallback;
516
goto end;
828
517
}
829
518
ret = set_cloexec_flag(pipefd[1]);
830
519
if(ret < 0){
831
520
perror("set_cloexec_flag");
832
521
exitstatus = EXIT_FAILURE;
833
goto fallback;
522
goto end;
834
523
}
835
524
/* Block SIGCHLD until process is safely in process list */
836
525
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
837
526
if(ret < 0){
838
527
perror("sigprocmask");
839
528
exitstatus = EXIT_FAILURE;
840
goto fallback;
529
goto end;
841
530
}
842
/* Starting a new process to be watched */
531
// Starting a new process to be watched
843
532
pid_t pid = fork();
844
533
if(pid == -1){
845
534
perror("fork");
846
535
exitstatus = EXIT_FAILURE;
847
goto fallback;
536
goto end;
848
537
}
849
538
if(pid == 0){
850
539
/* this is the child process */
870
559
above and must now close it manually here. */
871
560
closedir(dir);
872
561
}
873
if(p->environ[0] == NULL){
874
if(execv(filename, p->argv) < 0){
875
perror("execv");
876
_exit(EXIT_FAILURE);
877
}
878
} else {
879
if(execve(filename, p->argv, p->environ) < 0){
880
perror("execve");
881
_exit(EXIT_FAILURE);
882
}
562
if(execv(filename, p->argv) < 0){
563
perror("execv");
564
_exit(EXIT_FAILURE);
883
565
}
884
566
/* no return */
885
567
}
886
/* Parent process */
887
close(pipefd[1]); /* Close unused write end of pipe */
568
/* parent process */
888
569
free(filename);
889
plugin *new_plugin = getplugin(dirst->d_name);
890
if (new_plugin == NULL){
891
perror("getplugin");
570
close(pipefd[1]); /* close unused write end of pipe */
571
process *new_process = malloc(sizeof(process));
572
if (new_process == NULL){
573
perror("malloc");
892
574
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
893
575
if(ret < 0){
894
perror("sigprocmask");
576
perror("sigprocmask");
895
577
}
896
578
exitstatus = EXIT_FAILURE;
897
goto fallback;
579
goto end;
898
580
}
899
581
900
new_plugin->pid = pid;
901
new_plugin->fd = pipefd[0];
902
582
*new_process = (struct process){ .pid = pid,
583
.fd = pipefd[0],
584
.next = process_list };
585
// List handling
586
process_list = new_process;
903
587
/* Unblock SIGCHLD so signal handler can be run if this process
904
588
has already completed */
905
589
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
906
590
if(ret < 0){
907
591
perror("sigprocmask");
908
592
exitstatus = EXIT_FAILURE;
909
goto fallback;
910
}
911
912
FD_SET(new_plugin->fd, &rfds_all);
913
914
if (maxfd < new_plugin->fd){
915
maxfd = new_plugin->fd;
916
}
917
593
goto end;
594
}
595
596
FD_SET(new_process->fd, &rfds_all);
597
598
if (maxfd < new_process->fd){
599
maxfd = new_process->fd;
600
}
601
602
}
603
604
/* Free the plugin list */
605
for(plugin *next; plugin_list != NULL; plugin_list = next){
606
next = plugin_list->next;
607
free(plugin_list->argv);
608
free(plugin_list);
918
609
}
919
610
920
611
closedir(dir);
921
612
dir = NULL;
922
923
for(plugin *p = plugin_list; p != NULL; p = p->next){
924
if(p->pid != 0){
925
break;
926
}
927
if(p->next == NULL){
928
fprintf(stderr, "No plugin processes started. Incorrect plugin"
929
" directory?\n");
930
free_plugin_list();
931
}
613
614
if (process_list == NULL){
615
fprintf(stderr, "No plugin processes started. Incorrect plugin"
616
" directory?\n");
617
process_list = NULL;
932
618
}
933
934
/* Main loop while running plugins exist */
935
while(plugin_list){
619
while(process_list){
936
620
fd_set rfds = rfds_all;
937
621
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
938
622
if (select_ret == -1){
939
623
perror("select");
940
624
exitstatus = EXIT_FAILURE;
941
goto fallback;
625
goto end;
942
626
}
943
627
/* OK, now either a process completed, or something can be read
944
628
from one of them */
945
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
629
for(process *proc = process_list; proc ; proc = proc->next){
946
630
/* Is this process completely done? */
947
631
if(proc->eof and proc->completed){
948
632
/* Only accept the plugin output if it exited cleanly */
949
633
if(not WIFEXITED(proc->status)
950
634
or WEXITSTATUS(proc->status) != 0){
951
635
/* Bad exit by plugin */
952
953
636
if(debug){
954
637
if(WIFEXITED(proc->status)){
955
638
fprintf(stderr, "Plugin %u exited with status %d\n",
964
647
(unsigned int) (proc->pid));
965
648
}
966
649
}
967
968
650
/* Remove the plugin */
969
651
FD_CLR(proc->fd, &rfds_all);
970
971
652
/* Block signal while modifying process_list */
972
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
653
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
973
654
if(ret < 0){
974
655
perror("sigprocmask");
975
656
exitstatus = EXIT_FAILURE;
976
goto fallback;
977
}
978
free_plugin(proc);
657
goto end;
658
}
659
/* Delete this process entry from the list */
660
if(process_list == proc){
661
/* First one - simple */
662
process_list = proc->next;
663
} else {
664
/* Second one or later */
665
for(process *p = process_list; p != NULL; p = p->next){
666
if(p->next == proc){
667
p->next = proc->next;
668
break;
669
}
670
}
671
}
979
672
/* We are done modifying process list, so unblock signal */
980
673
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
981
674
NULL);
982
675
if(ret < 0){
983
676
perror("sigprocmask");
984
exitstatus = EXIT_FAILURE;
985
goto fallback;
986
}
987
988
if(plugin_list == NULL){
989
break;
990
}
991
continue;
677
}
678
free(proc->buffer);
679
free(proc);
680
/* We deleted this process from the list, so we can't go
681
proc->next. Therefore, start over from the beginning of
682
the process list */
683
break;
992
684
}
993
994
685
/* This process exited nicely, so print its buffer */
995
686
996
bool bret = print_out_password(proc->buffer,
997
proc->buffer_length);
687
bool bret = print_out_password(proc->buffer, proc->buffer_length);
998
688
if(not bret){
999
689
perror("print_out_password");
1000
690
exitstatus = EXIT_FAILURE;
1001
691
}
1002
goto fallback;
692
goto end;
1003
693
}
1004
1005
694
/* This process has not completed. Does it have any output? */
1006
695
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1007
696
/* This process had nothing to say at this time */
1014
703
if (proc->buffer == NULL){
1015
704
perror("malloc");
1016
705
exitstatus = EXIT_FAILURE;
1017
goto fallback;
706
goto end;
1018
707
}
1019
708
proc->buffer_size += BUFFER_SIZE;
1020
709
}
1035
724
}
1036
725
1037
726
1038
fallback:
727
end:
1039
728
1040
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1041
/* Fallback if all plugins failed, none are found or an error
1042
occured */
729
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
730
/* Fallback if all plugins failed, none are found or an error occured */
1043
731
bool bret;
1044
732
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1045
733
char *passwordbuffer = getpass("Password: ");
1047
735
if(not bret){
1048
736
perror("print_out_password");
1049
737
exitstatus = EXIT_FAILURE;
738
goto end;
1050
739
}
1051
740
}
1052
741
1053
742
/* Restore old signal handler */
1054
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1055
if(ret == -1){
1056
perror("sigaction");
1057
exitstatus = EXIT_FAILURE;
1058
}
1059
1060
if(custom_argv != NULL){
1061
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1062
free(*arg);
1063
}
1064
free(custom_argv);
743
sigaction(SIGCHLD, &old_sigchld_action, NULL);
744
745
free(plus_argv);
746
747
/* Free the plugin list */
748
for(plugin *next; plugin_list != NULL; plugin_list = next){
749
next = plugin_list->next;
750
free(plugin_list->argv);
751
free(plugin_list);
1065
752
}
1066
753
1067
754
if(dir != NULL){
1069
756
}
1070
757
1071
758
/* Free the process list and kill the processes */
1072
for(plugin *p = plugin_list; p != NULL; p = p->next){
1073
if(p->pid != 0){
1074
close(p->fd);
1075
ret = kill(p->pid, SIGTERM);
1076
if(ret == -1 and errno != ESRCH){
1077
/* Set-uid proccesses might not get closed */
1078
perror("kill");
1079
}
759
for(process *next; process_list != NULL; process_list = next){
760
next = process_list->next;
761
close(process_list->fd);
762
ret = kill(process_list->pid, SIGTERM);
763
if(ret == -1 and errno != ESRCH){
764
/* set-uid proccesses migth not get closed */
765
perror("kill");
1080
766
}
767
free(process_list->buffer);
768
free(process_list);
1081
769
}
1082
770
1083
771
/* Wait for any remaining child processes to terminate */
1087
775
if(errno != ECHILD){
1088
776
perror("wait");
1089
777
}
1090
1091
free_plugin_list();
1092
1093
free(plugindir);
1094
free(argfile);
1095
778
1096
779
return exitstatus;
1097
780
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0