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- Committer: Björn Påhlsson
- Date: 2008-09-04 19:59:05 UTC
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 164.
- Revision ID: belorn@braxen-20080904195905-a3qfv1np32auumwm
fixed two bugs:
A overbuffer flow in enviro variables causing seg fault
A incorrect use of strsep causing seg fault
A overbuffer flow in enviro variables causing seg fault
A incorrect use of strsep causing seg fault
- files added:
- .bzrignore
- files removed:
- network-protocol.txt
- files renamed:
- mandos-client.c => plugin-runner.c
- mandos-client.xml => plugin-runner.xml
- 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 CONFFILE "/conf/conf.d/mandos/client.conf"
69
70
const char *argp_program_version = "mandos-client 1.0";
68
69
#define PDIR "/lib/mandos/plugins.d"
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
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 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){
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) + 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));
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 = "/conf/conf.d/mandos/plugins.d";
213
const char *conffile = CONFFILE;
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' or arg == NULL){
289
414
break;
290
415
}
291
416
char *opt = strsep(&arg, ":");
292
if(opt[0] == '\0'){
293
break;
294
}
295
if(opt != NULL){
296
char *p;
297
while((p = strsep(&opt, ",")) != NULL){
298
if(p[0] == '\0'){
299
continue;
300
}
301
addargument(getplugin(name, plugins), p);
302
}
303
}
304
}
305
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:
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 */
315
479
uid = (uid_t)strtol(arg, NULL, 10);
316
480
break;
317
case 130:
481
case 131: /* --groupid */
318
482
gid = (gid_t)strtol(arg, NULL, 10);
319
483
break;
320
case 131:
484
case 132: /* --debug */
321
485
debug = true;
322
486
break;
323
487
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]",
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");
516
}
517
break;
518
case 130: /* --userid */
519
case 131: /* --groupid */
520
case 132: /* --debug */
521
case ARGP_KEY_ARG:
522
case ARGP_KEY_END:
523
break;
524
default:
525
return ARGP_ERR_UNKNOWN;
526
}
527
return 0;
528
}
529
530
struct argp argp = { .options = options,
531
.parser = parse_opt_config_file,
532
.args_doc = "",
338
533
.doc = "Mandos plugin runner -- Run plugins" };
339
534
340
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);
341
538
if (ret == ARGP_ERR_UNKNOWN){
342
539
fprintf(stderr, "Unknown error while parsing arguments\n");
343
540
exitstatus = EXIT_FAILURE;
344
goto end;
541
goto fallback;
345
542
}
346
347
conffp = fopen(conffile, "r");
543
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
}
348
553
if(conffp != NULL){
349
554
char *org_line = NULL;
555
char *p, *arg, *new_arg, *line;
350
556
size_t size = 0;
351
557
ssize_t sret;
352
char *p, *arg, *new_arg, *line;
353
558
const char whitespace_delims[] = " \r\t\f\v\n";
354
559
const char comment_delim[] = "#";
355
560
561
custom_argc = 1;
562
custom_argv = malloc(sizeof(char*) * 2);
563
if(custom_argv == NULL){
564
perror("malloc");
565
exitstatus = EXIT_FAILURE;
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 */
356
573
while(true){
357
574
sret = getline(&org_line, &size, conffp);
358
575
if(sret == -1){
366
583
continue;
367
584
}
368
585
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
}
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;
375
604
}
376
605
}
377
606
free(org_line);
378
} else{
379
/* check for harmfull errors */
607
} else {
608
/* Check for harmful errors and go to fallback. Other errors might
609
not affect opening plugins */
380
610
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
381
611
perror("fopen");
382
612
exitstatus = EXIT_FAILURE;
383
goto end;
613
goto fallback;
384
614
}
385
615
}
386
616
/* If there was any arguments from configuration file,
617
pass them to parser as command arguments */
387
618
if(custom_argv != NULL){
388
custom_argv[0] = argv[0];
389
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
619
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
620
0, NULL);
390
621
if (ret == ARGP_ERR_UNKNOWN){
391
622
fprintf(stderr, "Unknown error while parsing arguments\n");
392
623
exitstatus = EXIT_FAILURE;
393
goto end;
624
goto fallback;
394
625
}
395
626
}
396
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
397
637
if(debug){
398
638
for(plugin *p = plugin_list; p != NULL; p=p->next){
399
639
fprintf(stderr, "Plugin: %s has %d arguments\n",
401
641
for(char **a = p->argv; *a != NULL; a++){
402
642
fprintf(stderr, "\tArg: %s\n", *a);
403
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
}
404
648
}
405
649
}
406
650
651
/* Strip permissions down to nobody */
407
652
ret = setuid(uid);
408
653
if (ret == -1){
409
654
perror("setuid");
410
}
411
655
}
412
656
setgid(gid);
413
657
if (ret == -1){
414
658
perror("setgid");
415
659
}
416
660
417
dir = opendir(plugindir);
661
if (plugindir == NULL){
662
dir = opendir(PDIR);
663
} else {
664
dir = opendir(plugindir);
665
}
666
418
667
if(dir == NULL){
419
668
perror("Could not open plugin dir");
420
669
exitstatus = EXIT_FAILURE;
421
goto end;
670
goto fallback;
422
671
}
423
672
424
673
/* Set the FD_CLOEXEC flag on the directory, if possible */
429
678
if(ret < 0){
430
679
perror("set_cloexec_flag");
431
680
exitstatus = EXIT_FAILURE;
432
goto end;
681
goto fallback;
433
682
}
434
683
}
435
684
}
436
685
437
686
FD_ZERO(&rfds_all);
438
687
688
/* Read and execute any executable in the plugin directory*/
439
689
while(true){
440
690
dirst = readdir(dir);
441
691
442
// All directory entries have been processed
692
/* All directory entries have been processed */
443
693
if(dirst == NULL){
444
694
if (errno == EBADF){
445
695
perror("readdir");
446
696
exitstatus = EXIT_FAILURE;
447
goto end;
697
goto fallback;
448
698
}
449
699
break;
450
700
}
451
701
452
702
d_name_len = strlen(dirst->d_name);
453
703
454
// Ignore dotfiles, backup files and other junk
704
/* Ignore dotfiles, backup files and other junk */
455
705
{
456
706
bool bad_name = false;
457
707
472
722
break;
473
723
}
474
724
}
475
476
725
if(bad_name){
477
726
continue;
478
727
}
479
480
728
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
481
729
size_t suf_len = strlen(*suf);
482
730
if((d_name_len >= suf_len)
495
743
continue;
496
744
}
497
745
}
498
499
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
500
if (filename == NULL){
501
perror("malloc");
746
747
char *filename;
748
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
749
if(ret < 0){
750
perror("asprintf");
502
751
continue;
503
752
}
504
strcpy(filename, plugindir); /* Spurious warning */
505
strcat(filename, "/"); /* Spurious warning */
506
strcat(filename, dirst->d_name); /* Spurious warning */
507
753
508
754
ret = stat(filename, &st);
509
755
if (ret == -1){
511
757
free(filename);
512
758
continue;
513
759
}
514
760
761
/* Ignore non-executable files */
515
762
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
516
763
if(debug){
517
764
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
520
767
free(filename);
521
768
continue;
522
769
}
523
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){
524
778
if(debug){
525
779
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
526
780
dirst->d_name);
528
782
free(filename);
529
783
continue;
530
784
}
531
plugin *p = getplugin(dirst->d_name, &plugin_list);
532
785
{
533
786
/* Add global arguments to argument list for this plugin */
534
plugin *g = getplugin(NULL, &plugin_list);
535
for(char **a = g->argv + 1; *a != NULL; a++){
536
addargument(p, *a);
537
}
538
}
539
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];
540
814
ret = pipe(pipefd);
541
815
if (ret == -1){
542
816
perror("pipe");
543
817
exitstatus = EXIT_FAILURE;
544
goto end;
818
goto fallback;
545
819
}
820
/* Ask OS to automatic close the pipe on exec */
546
821
ret = set_cloexec_flag(pipefd[0]);
547
822
if(ret < 0){
548
823
perror("set_cloexec_flag");
549
824
exitstatus = EXIT_FAILURE;
550
goto end;
825
goto fallback;
551
826
}
552
827
ret = set_cloexec_flag(pipefd[1]);
553
828
if(ret < 0){
554
829
perror("set_cloexec_flag");
555
830
exitstatus = EXIT_FAILURE;
556
goto end;
831
goto fallback;
557
832
}
558
833
/* Block SIGCHLD until process is safely in process list */
559
834
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
560
835
if(ret < 0){
561
836
perror("sigprocmask");
562
837
exitstatus = EXIT_FAILURE;
563
goto end;
838
goto fallback;
564
839
}
565
// Starting a new process to be watched
840
/* Starting a new process to be watched */
566
841
pid_t pid = fork();
567
842
if(pid == -1){
568
843
perror("fork");
569
844
exitstatus = EXIT_FAILURE;
570
goto end;
845
goto fallback;
571
846
}
572
847
if(pid == 0){
573
848
/* this is the child process */
593
868
above and must now close it manually here. */
594
869
closedir(dir);
595
870
}
596
if(execv(filename, p->argv) < 0){
597
perror("execv");
598
_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
}
599
881
}
600
882
/* no return */
601
883
}
602
/* parent process */
884
/* Parent process */
885
close(pipefd[1]); /* Close unused write end of pipe */
603
886
free(filename);
604
close(pipefd[1]); /* close unused write end of pipe */
605
process *new_process = malloc(sizeof(process));
606
if (new_process == NULL){
607
perror("malloc");
887
plugin *new_plugin = getplugin(dirst->d_name);
888
if (new_plugin == NULL){
889
perror("getplugin");
608
890
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
609
891
if(ret < 0){
610
perror("sigprocmask");
892
perror("sigprocmask");
611
893
}
612
894
exitstatus = EXIT_FAILURE;
613
goto end;
895
goto fallback;
614
896
}
615
897
616
*new_process = (struct process){ .pid = pid,
617
.fd = pipefd[0],
618
.next = process_list };
619
// List handling
620
process_list = new_process;
898
new_plugin->pid = pid;
899
new_plugin->fd = pipefd[0];
900
621
901
/* Unblock SIGCHLD so signal handler can be run if this process
622
902
has already completed */
623
903
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
624
904
if(ret < 0){
625
905
perror("sigprocmask");
626
906
exitstatus = EXIT_FAILURE;
627
goto end;
628
}
629
630
FD_SET(new_process->fd, &rfds_all);
631
632
if (maxfd < new_process->fd){
633
maxfd = new_process->fd;
634
}
635
636
}
637
638
/* Free the plugin list */
639
for(plugin *next; plugin_list != NULL; plugin_list = next){
640
next = plugin_list->next;
641
free(plugin_list->argv);
642
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
643
916
}
644
917
645
918
closedir(dir);
646
919
dir = NULL;
647
648
if (process_list == NULL){
649
fprintf(stderr, "No plugin processes started. Incorrect plugin"
650
" directory?\n");
651
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
}
652
930
}
653
while(process_list){
931
932
/* Main loop while running plugins exist */
933
while(plugin_list){
654
934
fd_set rfds = rfds_all;
655
935
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
656
936
if (select_ret == -1){
657
937
perror("select");
658
938
exitstatus = EXIT_FAILURE;
659
goto end;
939
goto fallback;
660
940
}
661
941
/* OK, now either a process completed, or something can be read
662
942
from one of them */
663
for(process *proc = process_list; proc ; proc = proc->next){
943
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
664
944
/* Is this process completely done? */
665
945
if(proc->eof and proc->completed){
666
946
/* Only accept the plugin output if it exited cleanly */
667
947
if(not WIFEXITED(proc->status)
668
948
or WEXITSTATUS(proc->status) != 0){
669
949
/* Bad exit by plugin */
950
670
951
if(debug){
671
952
if(WIFEXITED(proc->status)){
672
953
fprintf(stderr, "Plugin %u exited with status %d\n",
681
962
(unsigned int) (proc->pid));
682
963
}
683
964
}
965
684
966
/* Remove the plugin */
685
967
FD_CLR(proc->fd, &rfds_all);
968
686
969
/* Block signal while modifying process_list */
687
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
970
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
688
971
if(ret < 0){
689
972
perror("sigprocmask");
690
973
exitstatus = EXIT_FAILURE;
691
goto end;
692
}
693
/* Delete this process entry from the list */
694
if(process_list == proc){
695
/* First one - simple */
696
process_list = proc->next;
697
} else {
698
/* Second one or later */
699
for(process *p = process_list; p != NULL; p = p->next){
700
if(p->next == proc){
701
p->next = proc->next;
702
break;
703
}
704
}
705
}
974
goto fallback;
975
}
976
free_plugin(proc);
706
977
/* We are done modifying process list, so unblock signal */
707
978
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
708
979
NULL);
709
980
if(ret < 0){
710
981
perror("sigprocmask");
711
}
712
free(proc->buffer);
713
free(proc);
714
/* We deleted this process from the list, so we can't go
715
proc->next. Therefore, start over from the beginning of
716
the process list */
717
break;
982
exitstatus = EXIT_FAILURE;
983
goto fallback;
984
}
985
986
if(plugin_list == NULL){
987
break;
988
}
989
continue;
718
990
}
991
719
992
/* This process exited nicely, so print its buffer */
720
993
721
bool bret = print_out_password(proc->buffer, proc->buffer_length);
994
bool bret = print_out_password(proc->buffer,
995
proc->buffer_length);
722
996
if(not bret){
723
997
perror("print_out_password");
724
998
exitstatus = EXIT_FAILURE;
725
999
}
726
goto end;
1000
goto fallback;
727
1001
}
1002
728
1003
/* This process has not completed. Does it have any output? */
729
1004
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
730
1005
/* This process had nothing to say at this time */
737
1012
if (proc->buffer == NULL){
738
1013
perror("malloc");
739
1014
exitstatus = EXIT_FAILURE;
740
goto end;
1015
goto fallback;
741
1016
}
742
1017
proc->buffer_size += BUFFER_SIZE;
743
1018
}
758
1033
}
759
1034
760
1035
761
end:
1036
fallback:
762
1037
763
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
764
/* 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 */
765
1041
bool bret;
766
1042
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
767
1043
char *passwordbuffer = getpass("Password: ");
769
1045
if(not bret){
770
1046
perror("print_out_password");
771
1047
exitstatus = EXIT_FAILURE;
772
goto end;
773
1048
}
774
1049
}
775
1050
776
1051
/* Restore old signal handler */
777
sigaction(SIGCHLD, &old_sigchld_action, NULL);
778
779
free(custom_argv);
780
781
/* Free the plugin list */
782
for(plugin *next; plugin_list != NULL; plugin_list = next){
783
next = plugin_list->next;
784
free(plugin_list->argv);
785
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);
786
1063
}
787
1064
788
1065
if(dir != NULL){
790
1067
}
791
1068
792
1069
/* Free the process list and kill the processes */
793
for(process *next; process_list != NULL; process_list = next){
794
next = process_list->next;
795
close(process_list->fd);
796
ret = kill(process_list->pid, SIGTERM);
797
if(ret == -1 and errno != ESRCH){
798
/* set-uid proccesses migth not get closed */
799
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
}
800
1078
}
801
free(process_list->buffer);
802
free(process_list);
803
1079
}
804
1080
805
1081
/* Wait for any remaining child processes to terminate */
809
1085
if(errno != ECHILD){
810
1086
perror("wait");
811
1087
}
1088
1089
free_plugin_list();
1090
1091
free(plugindir);
1092
free(argfile);
812
1093
813
1094
return exitstatus;
814
1095
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0