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- Committer: Teddy Hogeborn
- Date: 2008-09-05 18:37:28 UTC
- Revision ID: teddy@fukt.bsnet.se-20080905183728-l0m8v3vqa302uwrw
* mandos (main): Use EAFP with pidfile.
- 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,
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
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
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*/
75
86
pid_t pid;
76
87
int fd;
77
88
char *buffer;
78
89
size_t buffer_size;
79
90
size_t buffer_length;
80
91
bool eof;
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;
92
volatile bool completed;
93
volatile int status;
91
94
struct plugin *next;
92
95
} plugin;
93
96
94
static plugin *getplugin(char *name, plugin **plugin_list){
95
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){
96
104
if ((p->name == name)
97
105
or (p->name and name and (strcmp(p->name, name) == 0))){
98
106
return p;
101
109
/* Create a new plugin */
102
110
plugin *new_plugin = malloc(sizeof(plugin));
103
111
if (new_plugin == NULL){
104
perror("malloc");
105
exit(EXIT_FAILURE);
106
}
107
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
108
127
new_plugin->argv = malloc(sizeof(char *) * 2);
109
128
if (new_plugin->argv == NULL){
110
perror("malloc");
111
exit(EXIT_FAILURE);
129
free(copy_name);
130
free(new_plugin);
131
return NULL;
112
132
}
113
new_plugin->argv[0] = name;
133
new_plugin->argv[0] = copy_name;
114
134
new_plugin->argv[1] = NULL;
115
new_plugin->argc = 1;
116
new_plugin->disabled = false;
117
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
118
145
/* Append the new plugin to the list */
119
*plugin_list = new_plugin;
146
plugin_list = new_plugin;
120
147
return new_plugin;
121
148
}
122
149
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;
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) + 1);
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));
132
204
}
133
205
134
206
/*
147
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
148
220
}
149
221
150
process *process_list = NULL;
151
222
152
/* Mark a process as completed when it exits, and save its exit
223
/* Mark processes as completed when they exit, and save their exit
153
224
status. */
154
225
void handle_sigchld(__attribute__((unused)) int sig){
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;
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
}
171
253
}
172
254
255
/* Prints out a password to stdout */
173
256
bool print_out_password(const char *buffer, size_t length){
174
257
ssize_t ret;
175
258
if(length>0 and buffer[length-1] == '\n'){
185
268
return true;
186
269
}
187
270
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
188
307
int main(int argc, char *argv[]){
189
const char *plugindir = "/lib/mandos/plugins.d";
308
char *plugindir = NULL;
309
char *argfile = NULL;
310
FILE *conffp;
190
311
size_t d_name_len;
191
312
DIR *dir = NULL;
192
313
struct dirent *dirst;
200
321
struct sigaction old_sigchld_action;
201
322
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
202
323
.sa_flags = SA_NOCLDSTOP };
203
char *plus_options = NULL;
204
char **plus_argv = NULL;
205
324
char **custom_argv = NULL;
325
int custom_argc = 0;
326
206
327
/* Establish a signal handler */
207
328
sigemptyset(&sigchld_action.sa_mask);
208
329
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
209
if(ret < 0){
330
if(ret == -1){
210
331
perror("sigaddset");
211
exit(EXIT_FAILURE);
332
exitstatus = EXIT_FAILURE;
333
goto fallback;
212
334
}
213
335
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
214
if(ret < 0){
336
if(ret == -1){
215
337
perror("sigaction");
216
exit(EXIT_FAILURE);
338
exitstatus = EXIT_FAILURE;
339
goto fallback;
217
340
}
218
341
219
342
/* The options we understand. */
221
344
{ .name = "global-options", .key = 'g',
222
345
.arg = "OPTION[,OPTION[,...]]",
223
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" },
224
350
{ .name = "options-for", .key = 'o',
225
351
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
226
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" },
227
356
{ .name = "disable", .key = 'd',
228
357
.arg = "PLUGIN",
229
358
.doc = "Disable a specific plugin", .group = 1 },
359
{ .name = "enable", .key = 'e',
360
.arg = "PLUGIN",
361
.doc = "Enable a specific plugin", .group = 1 },
230
362
{ .name = "plugin-dir", .key = 128,
231
363
.arg = "DIRECTORY",
232
364
.doc = "Specify a different plugin directory", .group = 2 },
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 },
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 },
241
376
{ .name = NULL }
242
377
};
243
378
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;
379
error_t parse_opt (int key, char *arg, __attribute__((unused))
380
struct argp_state *state) {
248
381
switch (key) {
249
case 'g':
382
case 'g': /* --global-options */
250
383
if (arg != NULL){
251
384
char *p;
252
385
while((p = strsep(&arg, ",")) != NULL){
253
if(strcmp(p, "") == 0){
386
if(p[0] == '\0'){
254
387
continue;
255
388
}
256
addargument(getplugin(NULL, plugins), p);
257
}
258
}
259
break;
260
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 */
261
411
if (arg != NULL){
262
char *name = strsep(&arg, ":");
263
if(strcmp(name, "") == 0){
412
char *p_name = strsep(&arg, ":");
413
if(p_name[0] == '\0' or arg == NULL){
264
414
break;
265
415
}
266
416
char *opt = strsep(&arg, ":");
267
if(strcmp(opt, "") == 0){
268
break;
269
}
270
if(opt != NULL){
271
char *p;
272
while((p = strsep(&opt, ",")) != NULL){
273
if(strcmp(p, "") == 0){
274
continue;
275
}
276
addargument(getplugin(name, plugins), p);
277
}
278
}
279
}
280
break;
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:
417
if(opt[0] == '\0' or opt == NULL){
418
break;
419
}
420
char *p;
421
while((p = strsep(&opt, ",")) != NULL){
422
if(p[0] == '\0'){
423
continue;
424
}
425
if(not add_argument(getplugin(p_name), p)){
426
perror("add_argument");
427
return ARGP_ERR_UNKNOWN;
428
}
429
}
430
}
431
break;
432
case 'E': /* --env-for */
433
if(arg == NULL){
434
break;
435
}
436
{
437
char *envdef = strchr(arg, ':');
438
if(envdef == NULL){
439
break;
440
}
441
char *p_name = strndup(arg, (size_t) (envdef-arg));
442
if(p_name == NULL){
443
break;
444
}
445
envdef++;
446
if(not add_environment(getplugin(p_name), envdef, true)){
447
perror("add_environment");
448
}
449
}
450
break;
451
case 'd': /* --disable */
452
if (arg != NULL){
453
plugin *p = getplugin(arg);
454
if(p == NULL){
455
return ARGP_ERR_UNKNOWN;
456
}
457
p->disabled = true;
458
}
459
break;
460
case 'e': /* --enable */
461
if (arg != NULL){
462
plugin *p = getplugin(arg);
463
if(p == NULL){
464
return ARGP_ERR_UNKNOWN;
465
}
466
p->disabled = false;
467
}
468
break;
469
case 128: /* --plugin-dir */
470
plugindir = strdup(arg);
471
if(plugindir == NULL){
472
perror("strdup");
473
}
474
break;
475
case 129: /* --config-file */
476
/* This is already done by parse_opt_config_file() */
477
break;
478
case 130: /* --userid */
290
479
uid = (uid_t)strtol(arg, NULL, 10);
291
480
break;
292
case 130:
481
case 131: /* --groupid */
293
482
gid = (gid_t)strtol(arg, NULL, 10);
294
483
break;
295
case 131:
484
case 132: /* --debug */
296
485
debug = true;
297
486
break;
298
487
case ARGP_KEY_ARG:
299
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
300
argp_usage (state);
488
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
489
break;
490
case ARGP_KEY_END:
491
break;
492
default:
493
return ARGP_ERR_UNKNOWN;
494
}
495
return 0;
496
}
497
498
/* This option parser is the same as parse_opt() above, except it
499
ignores everything but the --config-file option. */
500
error_t parse_opt_config_file (int key, char *arg,
501
__attribute__((unused))
502
struct argp_state *state) {
503
switch (key) {
504
case 'g': /* --global-options */
505
case 'G': /* --global-env */
506
case 'o': /* --options-for */
507
case 'E': /* --env-for */
508
case 'd': /* --disable */
509
case 'e': /* --enable */
510
case 128: /* --plugin-dir */
511
break;
512
case 129: /* --config-file */
513
argfile = strdup(arg);
514
if(argfile == NULL){
515
perror("strdup");
301
516
}
302
plus_options = arg;
303
break;
517
break;
518
case 130: /* --userid */
519
case 131: /* --groupid */
520
case 132: /* --debug */
521
case ARGP_KEY_ARG:
304
522
case ARGP_KEY_END:
305
523
break;
306
524
default:
309
527
return 0;
310
528
}
311
529
312
plugin *plugin_list = NULL;
313
314
struct argp argp = { .options = options, .parser = parse_opt,
315
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
530
struct argp argp = { .options = options,
531
.parser = parse_opt_config_file,
532
.args_doc = "",
316
533
.doc = "Mandos plugin runner -- Run plugins" };
317
534
318
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
535
/* Parse using the parse_opt_config_file in order to get the custom
536
config file location, if any. */
537
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
319
538
if (ret == ARGP_ERR_UNKNOWN){
320
539
fprintf(stderr, "Unknown error while parsing arguments\n");
321
540
exitstatus = EXIT_FAILURE;
322
goto end;
541
goto fallback;
323
542
}
324
543
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){
544
/* Reset to the normal argument parser */
545
argp.parser = parse_opt;
546
547
/* Open the configfile if available */
548
if (argfile == NULL){
549
conffp = fopen(AFILE, "r");
550
} else {
551
conffp = fopen(argfile, "r");
552
}
553
if(conffp != NULL){
554
char *org_line = NULL;
555
char *p, *arg, *new_arg, *line;
556
size_t size = 0;
557
ssize_t sret;
558
const char whitespace_delims[] = " \r\t\f\v\n";
559
const char comment_delim[] = "#";
560
561
custom_argc = 1;
562
custom_argv = malloc(sizeof(char*) * 2);
563
if(custom_argv == NULL){
335
564
perror("malloc");
336
565
exitstatus = EXIT_FAILURE;
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);
566
goto fallback;
567
}
568
custom_argv[0] = argv[0];
569
custom_argv[1] = NULL;
570
571
/* for each line in the config file, strip whitespace and ignore
572
commented text */
573
while(true){
574
sret = getline(&org_line, &size, conffp);
575
if(sret == -1){
576
break;
577
}
578
579
line = org_line;
580
arg = strsep(&line, comment_delim);
581
while((p = strsep(&arg, whitespace_delims)) != NULL){
582
if(p[0] == '\0'){
583
continue;
584
}
585
new_arg = strdup(p);
586
if(new_arg == NULL){
587
perror("strdup");
588
exitstatus = EXIT_FAILURE;
589
free(org_line);
590
goto fallback;
591
}
592
593
custom_argc += 1;
594
custom_argv = realloc(custom_argv, sizeof(char *)
595
* ((unsigned int) custom_argc + 1));
596
if(custom_argv == NULL){
597
perror("realloc");
598
exitstatus = EXIT_FAILURE;
599
free(org_line);
600
goto fallback;
601
}
602
custom_argv[custom_argc-1] = new_arg;
603
custom_argv[custom_argc] = NULL;
604
}
605
}
606
free(org_line);
607
} else {
608
/* Check for harmful errors and go to fallback. Other errors might
609
not affect opening plugins */
610
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
611
perror("fopen");
612
exitstatus = EXIT_FAILURE;
613
goto fallback;
614
}
615
}
616
/* If there was any arguments from configuration file,
617
pass them to parser as command arguments */
618
if(custom_argv != NULL){
619
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
620
0, NULL);
356
621
if (ret == ARGP_ERR_UNKNOWN){
357
622
fprintf(stderr, "Unknown error while parsing arguments\n");
358
623
exitstatus = EXIT_FAILURE;
359
goto end;
624
goto fallback;
360
625
}
361
626
}
362
627
628
/* Parse actual command line arguments, to let them override the
629
config file */
630
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
631
if (ret == ARGP_ERR_UNKNOWN){
632
fprintf(stderr, "Unknown error while parsing arguments\n");
633
exitstatus = EXIT_FAILURE;
634
goto fallback;
635
}
636
363
637
if(debug){
364
638
for(plugin *p = plugin_list; p != NULL; p=p->next){
365
639
fprintf(stderr, "Plugin: %s has %d arguments\n",
367
641
for(char **a = p->argv; *a != NULL; a++){
368
642
fprintf(stderr, "\tArg: %s\n", *a);
369
643
}
644
fprintf(stderr, "...and %u environment variables\n", p->envc);
645
for(char **a = p->environ; *a != NULL; a++){
646
fprintf(stderr, "\t%s\n", *a);
647
}
370
648
}
371
649
}
372
650
651
/* Strip permissions down to nobody */
373
652
ret = setuid(uid);
374
653
if (ret == -1){
375
654
perror("setuid");
376
}
377
655
}
378
656
setgid(gid);
379
657
if (ret == -1){
380
658
perror("setgid");
381
659
}
382
660
383
dir = opendir(plugindir);
661
if (plugindir == NULL){
662
dir = opendir(PDIR);
663
} else {
664
dir = opendir(plugindir);
665
}
666
384
667
if(dir == NULL){
385
668
perror("Could not open plugin dir");
386
669
exitstatus = EXIT_FAILURE;
387
goto end;
670
goto fallback;
388
671
}
389
672
390
673
/* Set the FD_CLOEXEC flag on the directory, if possible */
395
678
if(ret < 0){
396
679
perror("set_cloexec_flag");
397
680
exitstatus = EXIT_FAILURE;
398
goto end;
681
goto fallback;
399
682
}
400
683
}
401
684
}
402
685
403
686
FD_ZERO(&rfds_all);
404
687
688
/* Read and execute any executable in the plugin directory*/
405
689
while(true){
406
690
dirst = readdir(dir);
407
691
408
// All directory entries have been processed
692
/* All directory entries have been processed */
409
693
if(dirst == NULL){
410
694
if (errno == EBADF){
411
695
perror("readdir");
412
696
exitstatus = EXIT_FAILURE;
413
goto end;
697
goto fallback;
414
698
}
415
699
break;
416
700
}
417
701
418
702
d_name_len = strlen(dirst->d_name);
419
703
420
// Ignore dotfiles, backup files and other junk
704
/* Ignore dotfiles, backup files and other junk */
421
705
{
422
706
bool bad_name = false;
423
707
438
722
break;
439
723
}
440
724
}
441
442
725
if(bad_name){
443
726
continue;
444
727
}
445
446
728
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
447
729
size_t suf_len = strlen(*suf);
448
730
if((d_name_len >= suf_len)
461
743
continue;
462
744
}
463
745
}
464
465
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
466
if (filename == NULL){
467
perror("malloc");
746
747
char *filename;
748
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
749
if(ret < 0){
750
perror("asprintf");
468
751
continue;
469
752
}
470
strcpy(filename, plugindir); /* Spurious warning */
471
strcat(filename, "/"); /* Spurious warning */
472
strcat(filename, dirst->d_name); /* Spurious warning */
473
753
474
754
ret = stat(filename, &st);
475
755
if (ret == -1){
477
757
free(filename);
478
758
continue;
479
759
}
480
760
761
/* Ignore non-executable files */
481
762
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
482
763
if(debug){
483
764
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
486
767
free(filename);
487
768
continue;
488
769
}
489
if(getplugin(dirst->d_name, &plugin_list)->disabled){
770
771
plugin *p = getplugin(dirst->d_name);
772
if(p == NULL){
773
perror("getplugin");
774
free(filename);
775
continue;
776
}
777
if(p->disabled){
490
778
if(debug){
491
779
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
492
780
dirst->d_name);
494
782
free(filename);
495
783
continue;
496
784
}
497
plugin *p = getplugin(dirst->d_name, &plugin_list);
498
785
{
499
786
/* Add global arguments to argument list for this plugin */
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];
787
plugin *g = getplugin(NULL);
788
if(g != NULL){
789
for(char **a = g->argv + 1; *a != NULL; a++){
790
if(not add_argument(p, *a)){
791
perror("add_argument");
792
}
793
}
794
/* Add global environment variables */
795
for(char **e = g->environ; *e != NULL; e++){
796
if(not add_environment(p, *e, false)){
797
perror("add_environment");
798
}
799
}
800
}
801
}
802
/* If this plugin has any environment variables, we will call
803
using execve and need to duplicate the environment from this
804
process, too. */
805
if(p->environ[0] != NULL){
806
for(char **e = environ; *e != NULL; e++){
807
if(not add_environment(p, *e, false)){
808
perror("add_environment");
809
}
810
}
811
}
812
813
int pipefd[2];
506
814
ret = pipe(pipefd);
507
815
if (ret == -1){
508
816
perror("pipe");
509
817
exitstatus = EXIT_FAILURE;
510
goto end;
818
goto fallback;
511
819
}
820
/* Ask OS to automatic close the pipe on exec */
512
821
ret = set_cloexec_flag(pipefd[0]);
513
822
if(ret < 0){
514
823
perror("set_cloexec_flag");
515
824
exitstatus = EXIT_FAILURE;
516
goto end;
825
goto fallback;
517
826
}
518
827
ret = set_cloexec_flag(pipefd[1]);
519
828
if(ret < 0){
520
829
perror("set_cloexec_flag");
521
830
exitstatus = EXIT_FAILURE;
522
goto end;
831
goto fallback;
523
832
}
524
833
/* Block SIGCHLD until process is safely in process list */
525
834
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
526
835
if(ret < 0){
527
836
perror("sigprocmask");
528
837
exitstatus = EXIT_FAILURE;
529
goto end;
838
goto fallback;
530
839
}
531
// Starting a new process to be watched
840
/* Starting a new process to be watched */
532
841
pid_t pid = fork();
533
842
if(pid == -1){
534
843
perror("fork");
535
844
exitstatus = EXIT_FAILURE;
536
goto end;
845
goto fallback;
537
846
}
538
847
if(pid == 0){
539
848
/* this is the child process */
559
868
above and must now close it manually here. */
560
869
closedir(dir);
561
870
}
562
if(execv(filename, p->argv) < 0){
563
perror("execv");
564
_exit(EXIT_FAILURE);
871
if(p->environ[0] == NULL){
872
if(execv(filename, p->argv) < 0){
873
perror("execv");
874
_exit(EXIT_FAILURE);
875
}
876
} else {
877
if(execve(filename, p->argv, p->environ) < 0){
878
perror("execve");
879
_exit(EXIT_FAILURE);
880
}
565
881
}
566
882
/* no return */
567
883
}
568
/* parent process */
884
/* Parent process */
885
close(pipefd[1]); /* Close unused write end of pipe */
569
886
free(filename);
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");
887
plugin *new_plugin = getplugin(dirst->d_name);
888
if (new_plugin == NULL){
889
perror("getplugin");
574
890
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
575
891
if(ret < 0){
576
perror("sigprocmask");
892
perror("sigprocmask");
577
893
}
578
894
exitstatus = EXIT_FAILURE;
579
goto end;
895
goto fallback;
580
896
}
581
897
582
*new_process = (struct process){ .pid = pid,
583
.fd = pipefd[0],
584
.next = process_list };
585
// List handling
586
process_list = new_process;
898
new_plugin->pid = pid;
899
new_plugin->fd = pipefd[0];
900
587
901
/* Unblock SIGCHLD so signal handler can be run if this process
588
902
has already completed */
589
903
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
590
904
if(ret < 0){
591
905
perror("sigprocmask");
592
906
exitstatus = EXIT_FAILURE;
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);
907
goto fallback;
908
}
909
910
FD_SET(new_plugin->fd, &rfds_all);
911
912
if (maxfd < new_plugin->fd){
913
maxfd = new_plugin->fd;
914
}
915
609
916
}
610
917
611
918
closedir(dir);
612
919
dir = NULL;
613
614
if (process_list == NULL){
615
fprintf(stderr, "No plugin processes started. Incorrect plugin"
616
" directory?\n");
617
process_list = NULL;
920
921
for(plugin *p = plugin_list; p != NULL; p = p->next){
922
if(p->pid != 0){
923
break;
924
}
925
if(p->next == NULL){
926
fprintf(stderr, "No plugin processes started. Incorrect plugin"
927
" directory?\n");
928
free_plugin_list();
929
}
618
930
}
619
while(process_list){
931
932
/* Main loop while running plugins exist */
933
while(plugin_list){
620
934
fd_set rfds = rfds_all;
621
935
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
622
936
if (select_ret == -1){
623
937
perror("select");
624
938
exitstatus = EXIT_FAILURE;
625
goto end;
939
goto fallback;
626
940
}
627
941
/* OK, now either a process completed, or something can be read
628
942
from one of them */
629
for(process *proc = process_list; proc ; proc = proc->next){
943
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
630
944
/* Is this process completely done? */
631
945
if(proc->eof and proc->completed){
632
946
/* Only accept the plugin output if it exited cleanly */
633
947
if(not WIFEXITED(proc->status)
634
948
or WEXITSTATUS(proc->status) != 0){
635
949
/* Bad exit by plugin */
950
636
951
if(debug){
637
952
if(WIFEXITED(proc->status)){
638
953
fprintf(stderr, "Plugin %u exited with status %d\n",
647
962
(unsigned int) (proc->pid));
648
963
}
649
964
}
965
650
966
/* Remove the plugin */
651
967
FD_CLR(proc->fd, &rfds_all);
968
652
969
/* Block signal while modifying process_list */
653
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
970
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
654
971
if(ret < 0){
655
972
perror("sigprocmask");
656
973
exitstatus = EXIT_FAILURE;
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
}
974
goto fallback;
975
}
976
free_plugin(proc);
672
977
/* We are done modifying process list, so unblock signal */
673
978
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
674
979
NULL);
675
980
if(ret < 0){
676
981
perror("sigprocmask");
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;
982
exitstatus = EXIT_FAILURE;
983
goto fallback;
984
}
985
986
if(plugin_list == NULL){
987
break;
988
}
989
continue;
684
990
}
991
685
992
/* This process exited nicely, so print its buffer */
686
993
687
bool bret = print_out_password(proc->buffer, proc->buffer_length);
994
bool bret = print_out_password(proc->buffer,
995
proc->buffer_length);
688
996
if(not bret){
689
997
perror("print_out_password");
690
998
exitstatus = EXIT_FAILURE;
691
999
}
692
goto end;
1000
goto fallback;
693
1001
}
1002
694
1003
/* This process has not completed. Does it have any output? */
695
1004
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
696
1005
/* This process had nothing to say at this time */
703
1012
if (proc->buffer == NULL){
704
1013
perror("malloc");
705
1014
exitstatus = EXIT_FAILURE;
706
goto end;
1015
goto fallback;
707
1016
}
708
1017
proc->buffer_size += BUFFER_SIZE;
709
1018
}
724
1033
}
725
1034
726
1035
727
end:
1036
fallback:
728
1037
729
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
730
/* Fallback if all plugins failed, none are found or an error occured */
1038
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1039
/* Fallback if all plugins failed, none are found or an error
1040
occured */
731
1041
bool bret;
732
1042
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
733
1043
char *passwordbuffer = getpass("Password: ");
735
1045
if(not bret){
736
1046
perror("print_out_password");
737
1047
exitstatus = EXIT_FAILURE;
738
goto end;
739
1048
}
740
1049
}
741
1050
742
1051
/* Restore old signal handler */
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);
1052
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1053
if(ret == -1){
1054
perror("sigaction");
1055
exitstatus = EXIT_FAILURE;
1056
}
1057
1058
if(custom_argv != NULL){
1059
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1060
free(*arg);
1061
}
1062
free(custom_argv);
752
1063
}
753
1064
754
1065
if(dir != NULL){
756
1067
}
757
1068
758
1069
/* Free the process list and kill the processes */
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");
1070
for(plugin *p = plugin_list; p != NULL; p = p->next){
1071
if(p->pid != 0){
1072
close(p->fd);
1073
ret = kill(p->pid, SIGTERM);
1074
if(ret == -1 and errno != ESRCH){
1075
/* Set-uid proccesses might not get closed */
1076
perror("kill");
1077
}
766
1078
}
767
free(process_list->buffer);
768
free(process_list);
769
1079
}
770
1080
771
1081
/* Wait for any remaining child processes to terminate */
775
1085
if(errno != ECHILD){
776
1086
perror("wait");
777
1087
}
1088
1089
free_plugin_list();
1090
1091
free(plugindir);
1092
free(argfile);
778
1093
779
1094
return exitstatus;
780
1095
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0