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- Committer: Teddy Hogeborn
- Date: 2008-09-02 13:04:42 UTC
- Revision ID: teddy@fukt.bsnet.se-20080902130442-ytnjsmllaph18e20
* plugin-runner.xml (PLUGINS/WRITING PLUGINS): New section.
(BUGS): Commented out. There are no bugs.
(EXAMPLE): Added lots of examples.
(SECURITY): Added text.
(SEE ALSO): Added "crypttab(5)" and "execve(2)".
(BUGS): Commented out. There are no bugs.
(EXAMPLE): Added lots of examples.
(SECURITY): Added text.
(SEE ALSO): Added "crypttab(5)" and "execve(2)".
- files added:
- .bzrignore
- files removed:
- network-protocol.txt
- 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() */
25
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
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(), strcpy(),
55
strcat() */
54
#include <string.h> /* strsep, strlen(), asprintf() */
56
55
#include <errno.h> /* errno */
57
56
#include <argp.h> /* struct argp_option, struct
58
57
argp_state, struct argp,
59
58
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
error_t */
61
61
#include <signal.h> /* struct sigaction, sigemptyset(),
62
62
sigaddset(), sigaction(),
63
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
65
#include <errno.h> /* errno, EBADF */
66
66
67
67
#define BUFFER_SIZE 256
68
#define ARGFILE "/conf/conf.d/mandos/plugins.conf"
68
69
#define PDIR "/lib/mandos/plugins.d"
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
69
71
70
72
const char *argp_program_version = "plugin-runner 1.0";
71
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
72
74
73
struct process;
74
75
typedef struct process{
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*/
76
86
pid_t pid;
77
87
int fd;
78
88
char *buffer;
79
89
size_t buffer_size;
80
90
size_t buffer_length;
81
91
bool eof;
82
bool completed;
83
int status;
84
struct process *next;
85
} process;
86
87
typedef struct plugin{
88
char *name; /* can be NULL or any plugin name */
89
char **argv;
90
int argc;
91
bool disabled;
92
volatile bool completed;
93
volatile int status;
92
94
struct plugin *next;
93
95
} plugin;
94
96
95
static plugin *getplugin(char *name, plugin **plugin_list){
96
for (plugin *p = *plugin_list; p != NULL; p = p->next){
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){
97
104
if ((p->name == name)
98
105
or (p->name and name and (strcmp(p->name, name) == 0))){
99
106
return p;
102
109
/* Create a new plugin */
103
110
plugin *new_plugin = malloc(sizeof(plugin));
104
111
if (new_plugin == NULL){
105
perror("malloc");
106
exit(EXIT_FAILURE);
107
}
108
new_plugin->name = name;
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
109
127
new_plugin->argv = malloc(sizeof(char *) * 2);
110
128
if (new_plugin->argv == NULL){
111
perror("malloc");
112
exit(EXIT_FAILURE);
129
free(copy_name);
130
free(new_plugin);
131
return NULL;
113
132
}
114
new_plugin->argv[0] = name;
133
new_plugin->argv[0] = copy_name;
115
134
new_plugin->argv[1] = NULL;
116
new_plugin->argc = 1;
117
new_plugin->disabled = false;
118
new_plugin->next = *plugin_list;
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
119
145
/* Append the new plugin to the list */
120
*plugin_list = new_plugin;
146
plugin_list = new_plugin;
121
147
return new_plugin;
122
148
}
123
149
124
static void addargument(plugin *p, char *arg){
125
p->argv[p->argc] = arg;
126
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
127
if (p->argv == NULL){
128
perror("malloc");
129
exit(EXIT_FAILURE);
130
}
131
p->argc++;
132
p->argv[p->argc] = NULL;
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));
133
204
}
134
205
135
206
/*
148
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
149
220
}
150
221
151
process *process_list = NULL;
152
222
153
/* Mark a process as completed when it exits, and save its exit
223
/* Mark processes as completed when they exit, and save their exit
154
224
status. */
155
225
void handle_sigchld(__attribute__((unused)) int sig){
156
process *proc = process_list;
157
int status;
158
pid_t pid = wait(&status);
159
if(pid == -1){
160
perror("wait");
161
return;
162
}
163
while(proc != NULL and proc->pid != pid){
164
proc = proc->next;
165
}
166
if(proc == NULL){
167
/* Process not found in process list */
168
return;
169
}
170
proc->status = status;
171
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
}
172
253
}
173
254
255
/* Prints out a password to stdout */
174
256
bool print_out_password(const char *buffer, size_t length){
175
257
ssize_t ret;
176
258
if(length>0 and buffer[length-1] == '\n'){
186
268
return true;
187
269
}
188
270
189
char ** addcustomargument(char **argv, int *argc, char *arg){
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);
190
283
191
if (argv == NULL){
192
*argc = 1;
193
argv = malloc(sizeof(char*) * 2);
194
if(argv == NULL){
195
return NULL;
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
}
196
295
}
197
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
198
argv[1] = NULL;
199
}
200
*argc += 1;
201
argv = realloc(argv, sizeof(char *)
202
* ((unsigned int) *argc + 1));
203
if(argv == NULL){
204
return NULL;
205
}
206
argv[*argc-1] = arg;
207
argv[*argc] = NULL;
208
return argv;
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
}
209
305
}
210
306
211
307
int main(int argc, char *argv[]){
212
const char *plugindir = "/lib/mandos/plugins.d";
213
const char *argfile = ARGFILE;
308
char *plugindir = NULL;
309
char *argfile = NULL;
214
310
FILE *conffp;
215
311
size_t d_name_len;
216
312
DIR *dir = NULL;
231
327
/* Establish a signal handler */
232
328
sigemptyset(&sigchld_action.sa_mask);
233
329
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
234
if(ret < 0){
330
if(ret == -1){
235
331
perror("sigaddset");
236
exit(EXIT_FAILURE);
332
exitstatus = EXIT_FAILURE;
333
goto fallback;
237
334
}
238
335
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
239
if(ret < 0){
336
if(ret == -1){
240
337
perror("sigaction");
241
exit(EXIT_FAILURE);
338
exitstatus = EXIT_FAILURE;
339
goto fallback;
242
340
}
243
341
244
342
/* The options we understand. */
246
344
{ .name = "global-options", .key = 'g',
247
345
.arg = "OPTION[,OPTION[,...]]",
248
346
.doc = "Options passed to all plugins" },
347
{ .name = "global-env", .key = 'G',
348
.arg = "VAR=value",
349
.doc = "Environment variable passed to all plugins" },
249
350
{ .name = "options-for", .key = 'o',
250
351
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
251
352
.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" },
252
356
{ .name = "disable", .key = 'd',
253
357
.arg = "PLUGIN",
254
358
.doc = "Disable a specific plugin", .group = 1 },
359
{ .name = "enable", .key = 'e',
360
.arg = "PLUGIN",
361
.doc = "Enable a specific plugin", .group = 1 },
255
362
{ .name = "plugin-dir", .key = 128,
256
363
.arg = "DIRECTORY",
257
364
.doc = "Specify a different plugin directory", .group = 2 },
258
{ .name = "userid", .key = 129,
259
.arg = "ID", .flags = 0,
260
.doc = "User ID the plugins will run as", .group = 2 },
261
{ .name = "groupid", .key = 130,
262
.arg = "ID", .flags = 0,
263
.doc = "Group ID the plugins will run as", .group = 2 },
264
{ .name = "debug", .key = 131,
265
.doc = "Debug mode", .group = 3 },
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 },
266
376
{ .name = NULL }
267
377
};
268
378
269
error_t parse_opt (int key, char *arg, struct argp_state *state) {
270
/* Get the INPUT argument from `argp_parse', which we know is a
271
pointer to our plugin list pointer. */
272
plugin **plugins = state->input;
379
error_t parse_opt (int key, char *arg, __attribute__((unused))
380
struct argp_state *state) {
273
381
switch (key) {
274
case 'g':
382
case 'g': /* --global-options */
275
383
if (arg != NULL){
276
384
char *p;
277
385
while((p = strsep(&arg, ",")) != NULL){
278
386
if(p[0] == '\0'){
279
387
continue;
280
388
}
281
addargument(getplugin(NULL, plugins), p);
282
}
283
}
284
break;
285
case 'o':
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 */
286
411
if (arg != NULL){
287
char *name = strsep(&arg, ":");
288
if(name[0] == '\0'){
412
char *p_name = strsep(&arg, ":");
413
if(p_name[0] == '\0'){
289
414
break;
290
415
}
291
416
char *opt = strsep(&arg, ":");
298
423
if(p[0] == '\0'){
299
424
continue;
300
425
}
301
addargument(getplugin(name, plugins), p);
426
if(not add_argument(getplugin(p_name), p)){
427
perror("add_argument");
428
return ARGP_ERR_UNKNOWN;
429
}
302
430
}
303
431
}
304
432
}
305
433
break;
306
case 'd':
307
if (arg != NULL){
308
getplugin(arg, plugins)->disabled = true;
309
}
310
break;
311
case 128:
312
plugindir = arg;
313
break;
314
case 129:
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 */
315
481
uid = (uid_t)strtol(arg, NULL, 10);
316
482
break;
317
case 130:
483
case 131: /* --groupid */
318
484
gid = (gid_t)strtol(arg, NULL, 10);
319
485
break;
320
case 131:
486
case 132: /* --debug */
321
487
debug = true;
322
488
break;
323
489
case ARGP_KEY_ARG:
324
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
325
break;
326
case ARGP_KEY_END:
327
break;
328
default:
329
return ARGP_ERR_UNKNOWN;
330
}
331
return 0;
332
}
333
334
plugin *plugin_list = NULL;
335
336
struct argp argp = { .options = options, .parser = parse_opt,
337
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
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");
518
}
519
break;
520
case 130: /* --userid */
521
case 131: /* --groupid */
522
case 132: /* --debug */
523
case ARGP_KEY_ARG:
524
case ARGP_KEY_END:
525
break;
526
default:
527
return ARGP_ERR_UNKNOWN;
528
}
529
return 0;
530
}
531
532
struct argp argp = { .options = options,
533
.parser = parse_opt_config_file,
534
.args_doc = "",
338
535
.doc = "Mandos plugin runner -- Run plugins" };
339
536
340
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
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);
341
540
if (ret == ARGP_ERR_UNKNOWN){
342
541
fprintf(stderr, "Unknown error while parsing arguments\n");
343
542
exitstatus = EXIT_FAILURE;
344
goto end;
543
goto fallback;
345
544
}
346
347
conffp = fopen(argfile, "r");
545
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
}
348
555
if(conffp != NULL){
349
556
char *org_line = NULL;
557
char *p, *arg, *new_arg, *line;
350
558
size_t size = 0;
351
559
ssize_t sret;
352
char *p, *arg, *new_arg, *line;
353
560
const char whitespace_delims[] = " \r\t\f\v\n";
354
561
const char comment_delim[] = "#";
355
562
563
custom_argc = 1;
564
custom_argv = malloc(sizeof(char*) * 2);
565
if(custom_argv == NULL){
566
perror("malloc");
567
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 */
356
575
while(true){
357
576
sret = getline(&org_line, &size, conffp);
358
577
if(sret == -1){
366
585
continue;
367
586
}
368
587
new_arg = strdup(p);
369
custom_argv = addcustomargument(custom_argv, &custom_argc, new_arg);
370
if (custom_argv == NULL){
371
perror("addcustomargument");
372
exitstatus = EXIT_FAILURE;
373
goto end;
374
}
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;
375
606
}
376
607
}
377
608
free(org_line);
378
} else{
609
} else {
379
610
/* Check for harmful errors and go to fallback. Other errors might
380
611
not affect opening plugins */
381
612
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
382
613
perror("fopen");
383
614
exitstatus = EXIT_FAILURE;
384
goto end;
615
goto fallback;
385
616
}
386
617
}
387
618
/* If there was any arguments from configuration file,
619
pass them to parser as command arguments */
388
620
if(custom_argv != NULL){
389
custom_argv[0] = argv[0];
390
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
621
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
622
0, NULL);
391
623
if (ret == ARGP_ERR_UNKNOWN){
392
624
fprintf(stderr, "Unknown error while parsing arguments\n");
393
625
exitstatus = EXIT_FAILURE;
394
goto end;
626
goto fallback;
395
627
}
396
628
}
397
629
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
398
639
if(debug){
399
640
for(plugin *p = plugin_list; p != NULL; p=p->next){
400
641
fprintf(stderr, "Plugin: %s has %d arguments\n",
402
643
for(char **a = p->argv; *a != NULL; a++){
403
644
fprintf(stderr, "\tArg: %s\n", *a);
404
645
}
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
}
405
650
}
406
651
}
407
652
653
/* Strip permissions down to nobody */
408
654
ret = setuid(uid);
409
655
if (ret == -1){
410
656
perror("setuid");
411
}
412
657
}
413
658
setgid(gid);
414
659
if (ret == -1){
415
660
perror("setgid");
416
661
}
417
662
418
dir = opendir(plugindir);
663
if (plugindir == NULL){
664
dir = opendir(PDIR);
665
} else {
666
dir = opendir(plugindir);
667
}
668
419
669
if(dir == NULL){
420
670
perror("Could not open plugin dir");
421
671
exitstatus = EXIT_FAILURE;
422
goto end;
672
goto fallback;
423
673
}
424
674
425
675
/* Set the FD_CLOEXEC flag on the directory, if possible */
430
680
if(ret < 0){
431
681
perror("set_cloexec_flag");
432
682
exitstatus = EXIT_FAILURE;
433
goto end;
683
goto fallback;
434
684
}
435
685
}
436
686
}
437
687
438
688
FD_ZERO(&rfds_all);
439
689
690
/* Read and execute any executable in the plugin directory*/
440
691
while(true){
441
692
dirst = readdir(dir);
442
693
443
// All directory entries have been processed
694
/* All directory entries have been processed */
444
695
if(dirst == NULL){
445
696
if (errno == EBADF){
446
697
perror("readdir");
447
698
exitstatus = EXIT_FAILURE;
448
goto end;
699
goto fallback;
449
700
}
450
701
break;
451
702
}
452
703
453
704
d_name_len = strlen(dirst->d_name);
454
705
455
// Ignore dotfiles, backup files and other junk
706
/* Ignore dotfiles, backup files and other junk */
456
707
{
457
708
bool bad_name = false;
458
709
473
724
break;
474
725
}
475
726
}
476
477
727
if(bad_name){
478
728
continue;
479
729
}
480
481
730
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
482
731
size_t suf_len = strlen(*suf);
483
732
if((d_name_len >= suf_len)
496
745
continue;
497
746
}
498
747
}
499
500
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
501
if (filename == NULL){
502
perror("malloc");
748
749
char *filename;
750
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
751
if(ret < 0){
752
perror("asprintf");
503
753
continue;
504
754
}
505
strcpy(filename, plugindir); /* Spurious warning */
506
strcat(filename, "/"); /* Spurious warning */
507
strcat(filename, dirst->d_name); /* Spurious warning */
508
755
509
756
ret = stat(filename, &st);
510
757
if (ret == -1){
512
759
free(filename);
513
760
continue;
514
761
}
515
762
763
/* Ignore non-executable files */
516
764
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
517
765
if(debug){
518
766
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
521
769
free(filename);
522
770
continue;
523
771
}
524
if(getplugin(dirst->d_name, &plugin_list)->disabled){
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){
525
780
if(debug){
526
781
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
527
782
dirst->d_name);
529
784
free(filename);
530
785
continue;
531
786
}
532
plugin *p = getplugin(dirst->d_name, &plugin_list);
533
787
{
534
788
/* Add global arguments to argument list for this plugin */
535
plugin *g = getplugin(NULL, &plugin_list);
536
for(char **a = g->argv + 1; *a != NULL; a++){
537
addargument(p, *a);
538
}
539
}
540
int pipefd[2];
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];
541
816
ret = pipe(pipefd);
542
817
if (ret == -1){
543
818
perror("pipe");
544
819
exitstatus = EXIT_FAILURE;
545
goto end;
820
goto fallback;
546
821
}
822
/* Ask OS to automatic close the pipe on exec */
547
823
ret = set_cloexec_flag(pipefd[0]);
548
824
if(ret < 0){
549
825
perror("set_cloexec_flag");
550
826
exitstatus = EXIT_FAILURE;
551
goto end;
827
goto fallback;
552
828
}
553
829
ret = set_cloexec_flag(pipefd[1]);
554
830
if(ret < 0){
555
831
perror("set_cloexec_flag");
556
832
exitstatus = EXIT_FAILURE;
557
goto end;
833
goto fallback;
558
834
}
559
835
/* Block SIGCHLD until process is safely in process list */
560
836
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
561
837
if(ret < 0){
562
838
perror("sigprocmask");
563
839
exitstatus = EXIT_FAILURE;
564
goto end;
840
goto fallback;
565
841
}
566
// Starting a new process to be watched
842
/* Starting a new process to be watched */
567
843
pid_t pid = fork();
568
844
if(pid == -1){
569
845
perror("fork");
570
846
exitstatus = EXIT_FAILURE;
571
goto end;
847
goto fallback;
572
848
}
573
849
if(pid == 0){
574
850
/* this is the child process */
594
870
above and must now close it manually here. */
595
871
closedir(dir);
596
872
}
597
if(execv(filename, p->argv) < 0){
598
perror("execv");
599
_exit(EXIT_FAILURE);
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
}
600
883
}
601
884
/* no return */
602
885
}
603
/* parent process */
886
/* Parent process */
887
close(pipefd[1]); /* Close unused write end of pipe */
604
888
free(filename);
605
close(pipefd[1]); /* close unused write end of pipe */
606
process *new_process = malloc(sizeof(process));
607
if (new_process == NULL){
608
perror("malloc");
889
plugin *new_plugin = getplugin(dirst->d_name);
890
if (new_plugin == NULL){
891
perror("getplugin");
609
892
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
610
893
if(ret < 0){
611
perror("sigprocmask");
894
perror("sigprocmask");
612
895
}
613
896
exitstatus = EXIT_FAILURE;
614
goto end;
897
goto fallback;
615
898
}
616
899
617
*new_process = (struct process){ .pid = pid,
618
.fd = pipefd[0],
619
.next = process_list };
620
// List handling
621
process_list = new_process;
900
new_plugin->pid = pid;
901
new_plugin->fd = pipefd[0];
902
622
903
/* Unblock SIGCHLD so signal handler can be run if this process
623
904
has already completed */
624
905
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
625
906
if(ret < 0){
626
907
perror("sigprocmask");
627
908
exitstatus = EXIT_FAILURE;
628
goto end;
629
}
630
631
FD_SET(new_process->fd, &rfds_all);
632
633
if (maxfd < new_process->fd){
634
maxfd = new_process->fd;
635
}
636
637
}
638
639
/* Free the plugin list */
640
for(plugin *next; plugin_list != NULL; plugin_list = next){
641
next = plugin_list->next;
642
free(plugin_list->argv);
643
free(plugin_list);
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
644
918
}
645
919
646
920
closedir(dir);
647
921
dir = NULL;
648
649
if (process_list == NULL){
650
fprintf(stderr, "No plugin processes started. Incorrect plugin"
651
" directory?\n");
652
process_list = 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
}
653
932
}
654
while(process_list){
933
934
/* Main loop while running plugins exist */
935
while(plugin_list){
655
936
fd_set rfds = rfds_all;
656
937
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
657
938
if (select_ret == -1){
658
939
perror("select");
659
940
exitstatus = EXIT_FAILURE;
660
goto end;
941
goto fallback;
661
942
}
662
943
/* OK, now either a process completed, or something can be read
663
944
from one of them */
664
for(process *proc = process_list; proc ; proc = proc->next){
945
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
665
946
/* Is this process completely done? */
666
947
if(proc->eof and proc->completed){
667
948
/* Only accept the plugin output if it exited cleanly */
668
949
if(not WIFEXITED(proc->status)
669
950
or WEXITSTATUS(proc->status) != 0){
670
951
/* Bad exit by plugin */
952
671
953
if(debug){
672
954
if(WIFEXITED(proc->status)){
673
955
fprintf(stderr, "Plugin %u exited with status %d\n",
682
964
(unsigned int) (proc->pid));
683
965
}
684
966
}
967
685
968
/* Remove the plugin */
686
969
FD_CLR(proc->fd, &rfds_all);
970
687
971
/* Block signal while modifying process_list */
688
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
972
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
689
973
if(ret < 0){
690
974
perror("sigprocmask");
691
975
exitstatus = EXIT_FAILURE;
692
goto end;
693
}
694
/* Delete this process entry from the list */
695
if(process_list == proc){
696
/* First one - simple */
697
process_list = proc->next;
698
} else {
699
/* Second one or later */
700
for(process *p = process_list; p != NULL; p = p->next){
701
if(p->next == proc){
702
p->next = proc->next;
703
break;
704
}
705
}
706
}
976
goto fallback;
977
}
978
free_plugin(proc);
707
979
/* We are done modifying process list, so unblock signal */
708
980
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
709
981
NULL);
710
982
if(ret < 0){
711
983
perror("sigprocmask");
712
}
713
free(proc->buffer);
714
free(proc);
715
/* We deleted this process from the list, so we can't go
716
proc->next. Therefore, start over from the beginning of
717
the process list */
718
break;
984
exitstatus = EXIT_FAILURE;
985
goto fallback;
986
}
987
988
if(plugin_list == NULL){
989
break;
990
}
991
continue;
719
992
}
993
720
994
/* This process exited nicely, so print its buffer */
721
995
722
bool bret = print_out_password(proc->buffer, proc->buffer_length);
996
bool bret = print_out_password(proc->buffer,
997
proc->buffer_length);
723
998
if(not bret){
724
999
perror("print_out_password");
725
1000
exitstatus = EXIT_FAILURE;
726
1001
}
727
goto end;
1002
goto fallback;
728
1003
}
1004
729
1005
/* This process has not completed. Does it have any output? */
730
1006
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
731
1007
/* This process had nothing to say at this time */
738
1014
if (proc->buffer == NULL){
739
1015
perror("malloc");
740
1016
exitstatus = EXIT_FAILURE;
741
goto end;
1017
goto fallback;
742
1018
}
743
1019
proc->buffer_size += BUFFER_SIZE;
744
1020
}
759
1035
}
760
1036
761
1037
762
end:
1038
fallback:
763
1039
764
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
765
/* Fallback if all plugins failed, none are found or an error occured */
1040
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1041
/* Fallback if all plugins failed, none are found or an error
1042
occured */
766
1043
bool bret;
767
1044
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
768
1045
char *passwordbuffer = getpass("Password: ");
770
1047
if(not bret){
771
1048
perror("print_out_password");
772
1049
exitstatus = EXIT_FAILURE;
773
goto end;
774
1050
}
775
1051
}
776
1052
777
1053
/* Restore old signal handler */
778
sigaction(SIGCHLD, &old_sigchld_action, NULL);
779
780
free(custom_argv);
781
782
/* Free the plugin list */
783
for(plugin *next; plugin_list != NULL; plugin_list = next){
784
next = plugin_list->next;
785
free(plugin_list->argv);
786
free(plugin_list);
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);
787
1065
}
788
1066
789
1067
if(dir != NULL){
791
1069
}
792
1070
793
1071
/* Free the process list and kill the processes */
794
for(process *next; process_list != NULL; process_list = next){
795
next = process_list->next;
796
close(process_list->fd);
797
ret = kill(process_list->pid, SIGTERM);
798
if(ret == -1 and errno != ESRCH){
799
/* set-uid proccesses migth not get closed */
800
perror("kill");
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
}
801
1080
}
802
free(process_list->buffer);
803
free(process_list);
804
1081
}
805
1082
806
1083
/* Wait for any remaining child processes to terminate */
810
1087
if(errno != ECHILD){
811
1088
perror("wait");
812
1089
}
1090
1091
free_plugin_list();
1092
1093
free(plugindir);
1094
free(argfile);
813
1095
814
1096
return exitstatus;
815
1097
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0