To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 240
- compare with another revision
- download diff
- download tarball
- view history from revision 240
- Committer: Teddy Hogeborn
- Date: 2008-12-21 19:19:25 UTC
- mfrom: (24.1.116 mandos)
- Revision ID: teddy@fukt.bsnet.se-20081221191925-iw4js3mr8e04p35r
Merge "mandos-list" from belorn.
* Makefile (PROGS): Added "mandos-list".
(mandos-list): New.
* mandos-list: New; from merge. Added unicode support.
* Makefile (PROGS): Added "mandos-list".
(mandos-list): New.
* mandos-list: New; from merge. Added unicode support.
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- plugins.d/usplash
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2008 Teddy Hogeborn
6
* Copyright © 2008 Björn Påhlsson
6
7
*
7
8
* This program is free software: you can redistribute it and/or
8
9
* modify it under the terms of the GNU General Public License as
27
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
29
EXIT_SUCCESS, realloc() */
29
30
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
32
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
34
stat, waitpid(), WIFEXITED(),
34
35
WEXITSTATUS(), wait(), pid_t,
46
47
fcntl(), setuid(), setgid(),
47
48
F_GETFD, F_SETFD, FD_CLOEXEC,
48
49
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
dup2(), STDOUT_FILENO, _exit(),
50
51
execv(), write(), read(),
51
52
close() */
52
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
65
66
#include <errno.h> /* errno, EBADF */
66
67
67
68
#define BUFFER_SIZE 256
68
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
69
70
const char *argp_program_version = "plugin-runner 1.0";
69
70
#define PDIR "/lib/mandos/plugins.d"
71
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
72
73
const char *argp_program_version = "plugin-runner " VERSION;
71
74
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
72
75
73
struct process;
76
typedef struct plugin{
77
char *name; /* can be NULL or any plugin name */
78
char **argv;
79
int argc;
80
char **environ;
81
int envc;
82
bool disabled;
74
83
75
typedef struct process{
84
/* Variables used for running processes*/
76
85
pid_t pid;
77
86
int fd;
78
87
char *buffer;
81
90
bool eof;
82
91
volatile bool completed;
83
92
volatile 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
char **environ;
92
int envc;
93
bool disabled;
94
93
struct plugin *next;
95
94
} plugin;
96
95
97
static plugin *getplugin(char *name, plugin **plugin_list){
98
for (plugin *p = *plugin_list; p != NULL; p = p->next){
96
static plugin *plugin_list = NULL;
97
98
/* Gets an existing plugin based on name,
99
or if none is found, creates a new one */
100
static plugin *getplugin(char *name){
101
/* Check for exiting plugin with that name */
102
for (plugin *p = plugin_list; p != NULL; p = p->next){
99
103
if ((p->name == name)
100
104
or (p->name and name and (strcmp(p->name, name) == 0))){
101
105
return p;
116
120
117
121
*new_plugin = (plugin) { .name = copy_name,
118
122
.argc = 1,
119
.envc = 0,
120
123
.disabled = false,
121
.next = *plugin_list };
124
.next = plugin_list };
122
125
123
126
new_plugin->argv = malloc(sizeof(char *) * 2);
124
127
if (new_plugin->argv == NULL){
128
131
}
129
132
new_plugin->argv[0] = copy_name;
130
133
new_plugin->argv[1] = NULL;
131
134
132
135
new_plugin->environ = malloc(sizeof(char *));
133
136
if(new_plugin->environ == NULL){
134
137
free(copy_name);
137
140
return NULL;
138
141
}
139
142
new_plugin->environ[0] = NULL;
143
140
144
/* Append the new plugin to the list */
141
*plugin_list = new_plugin;
145
plugin_list = new_plugin;
142
146
return new_plugin;
143
147
}
144
148
174
178
}
175
179
176
180
/* Add to a plugin's environment */
177
static bool add_environment(plugin *p, const char *def){
181
static bool add_environment(plugin *p, const char *def, bool replace){
178
182
if(p == NULL){
179
183
return false;
180
184
}
185
/* namelen = length of name of environment variable */
186
size_t namelen = (size_t)(strchrnul(def, '=') - def);
187
/* Search for this environment variable */
188
for(char **e = p->environ; *e != NULL; e++){
189
if(strncmp(*e, def, namelen + 1) == 0){
190
/* It already exists */
191
if(replace){
192
char *new = realloc(*e, strlen(def) + 1);
193
if(new == NULL){
194
return false;
195
}
196
*e = new;
197
strcpy(*e, def);
198
}
199
return true;
200
}
201
}
181
202
return add_to_char_array(def, &(p->environ), &(p->envc));
182
203
}
183
204
184
185
205
/*
186
206
* Based on the example in the GNU LibC manual chapter 13.13 "File
187
207
* Descriptor Flags".
188
208
* *Note File Descriptor Flags:(libc)Descriptor Flags.
189
209
*/
190
static int set_cloexec_flag(int fd)
191
{
210
static int set_cloexec_flag(int fd){
192
211
int ret = fcntl(fd, F_GETFD, 0);
193
212
/* If reading the flags failed, return error indication now. */
194
213
if(ret < 0){
198
217
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
199
218
}
200
219
201
process *process_list = NULL;
202
220
203
221
/* Mark processes as completed when they exit, and save their exit
204
222
status. */
205
void handle_sigchld(__attribute__((unused)) int sig){
223
static void handle_sigchld(__attribute__((unused)) int sig){
206
224
while(true){
207
process *proc = process_list;
225
plugin *proc = plugin_list;
208
226
int status;
209
227
pid_t pid = waitpid(-1, &status, WNOHANG);
210
228
if(pid == 0){
218
236
/* No child processes */
219
237
break;
220
238
}
221
239
222
240
/* A child exited, find it in process_list */
223
241
while(proc != NULL and proc->pid != pid){
224
242
proc = proc->next;
232
250
}
233
251
}
234
252
235
bool print_out_password(const char *buffer, size_t length){
253
/* Prints out a password to stdout */
254
static bool print_out_password(const char *buffer, size_t length){
236
255
ssize_t ret;
237
if(length>0 and buffer[length-1] == '\n'){
238
length--;
239
}
240
256
for(size_t written = 0; written < length; written += (size_t)ret){
241
257
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
242
258
length - written));
247
263
return true;
248
264
}
249
265
250
char **add_to_argv(char **argv, int *argc, char *arg){
251
if (argv == NULL){
252
*argc = 1;
253
argv = malloc(sizeof(char*) * 2);
254
if(argv == NULL){
255
return NULL;
266
/* Removes and free a plugin from the plugin list */
267
static void free_plugin(plugin *plugin_node){
268
269
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
270
free(*arg);
271
}
272
free(plugin_node->argv);
273
for(char **env = plugin_node->environ; *env != NULL; env++){
274
free(*env);
275
}
276
free(plugin_node->environ);
277
free(plugin_node->buffer);
278
279
/* Removes the plugin from the singly-linked list */
280
if(plugin_node == plugin_list){
281
/* First one - simple */
282
plugin_list = plugin_list->next;
283
} else {
284
/* Second one or later */
285
for(plugin *p = plugin_list; p != NULL; p = p->next){
286
if(p->next == plugin_node){
287
p->next = plugin_node->next;
288
break;
289
}
256
290
}
257
argv[0] = NULL; /* Will be set to argv[0] in main before
258
parsing */
259
argv[1] = NULL;
260
}
261
*argc += 1;
262
argv = realloc(argv, sizeof(char *)
263
* ((unsigned int) *argc + 1));
264
if(argv == NULL){
265
return NULL;
266
}
267
argv[*argc-1] = arg;
268
argv[*argc] = NULL;
269
return argv;
291
}
292
293
free(plugin_node);
270
294
}
271
295
272
static void free_plugin_list(plugin *plugin_list){
273
for(plugin *next; plugin_list != NULL; plugin_list = next){
274
next = plugin_list->next;
275
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
276
free(*arg);
277
}
278
free(plugin_list->argv);
279
for(char **env = plugin_list->environ; *env != NULL; env++){
280
free(*env);
281
}
282
free(plugin_list->environ);
283
free(plugin_list);
296
static void free_plugin_list(void){
297
while(plugin_list != NULL){
298
free_plugin(plugin_list);
284
299
}
285
300
}
286
301
287
302
int main(int argc, char *argv[]){
288
const char *plugindir = "/lib/mandos/plugins.d";
289
const char *argfile = ARGFILE;
303
char *plugindir = NULL;
304
char *argfile = NULL;
290
305
FILE *conffp;
291
306
size_t d_name_len;
292
307
DIR *dir = NULL;
324
339
{ .name = "global-options", .key = 'g',
325
340
.arg = "OPTION[,OPTION[,...]]",
326
341
.doc = "Options passed to all plugins" },
327
{ .name = "global-envs", .key = 'e',
342
{ .name = "global-env", .key = 'G',
328
343
.arg = "VAR=value",
329
344
.doc = "Environment variable passed to all plugins" },
330
345
{ .name = "options-for", .key = 'o',
331
346
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
332
347
.doc = "Options passed only to specified plugin" },
333
{ .name = "envs-for", .key = 'f',
348
{ .name = "env-for", .key = 'E',
334
349
.arg = "PLUGIN:ENV=value",
335
350
.doc = "Environment variable passed to specified plugin" },
336
351
{ .name = "disable", .key = 'd',
337
352
.arg = "PLUGIN",
338
353
.doc = "Disable a specific plugin", .group = 1 },
354
{ .name = "enable", .key = 'e',
355
.arg = "PLUGIN",
356
.doc = "Enable a specific plugin", .group = 1 },
339
357
{ .name = "plugin-dir", .key = 128,
340
358
.arg = "DIRECTORY",
341
359
.doc = "Specify a different plugin directory", .group = 2 },
342
{ .name = "userid", .key = 129,
343
.arg = "ID", .flags = 0,
344
.doc = "User ID the plugins will run as", .group = 2 },
345
{ .name = "groupid", .key = 130,
346
.arg = "ID", .flags = 0,
347
.doc = "Group ID the plugins will run as", .group = 2 },
348
{ .name = "debug", .key = 131,
349
.doc = "Debug mode", .group = 3 },
360
{ .name = "config-file", .key = 129,
361
.arg = "FILE",
362
.doc = "Specify a different configuration file", .group = 2 },
363
{ .name = "userid", .key = 130,
364
.arg = "ID", .flags = 0,
365
.doc = "User ID the plugins will run as", .group = 3 },
366
{ .name = "groupid", .key = 131,
367
.arg = "ID", .flags = 0,
368
.doc = "Group ID the plugins will run as", .group = 3 },
369
{ .name = "debug", .key = 132,
370
.doc = "Debug mode", .group = 4 },
350
371
{ .name = NULL }
351
372
};
352
373
353
error_t parse_opt (int key, char *arg, struct argp_state *state) {
354
/* Get the INPUT argument from `argp_parse', which we know is a
355
pointer to our plugin list pointer. */
356
plugin **plugins = state->input;
374
error_t parse_opt (int key, char *arg, __attribute__((unused))
375
struct argp_state *state) {
357
376
switch (key) {
358
case 'g':
377
case 'g': /* --global-options */
359
378
if (arg != NULL){
360
379
char *p;
361
380
while((p = strsep(&arg, ",")) != NULL){
362
381
if(p[0] == '\0'){
363
382
continue;
364
383
}
365
if(not add_argument(getplugin(NULL, plugins), p)){
384
if(not add_argument(getplugin(NULL), p)){
366
385
perror("add_argument");
367
386
return ARGP_ERR_UNKNOWN;
368
387
}
369
388
}
370
389
}
371
390
break;
372
case 'e':
391
case 'G': /* --global-env */
373
392
if(arg == NULL){
374
393
break;
375
394
}
376
{
377
char *envdef = strdup(arg);
378
if(envdef == NULL){
379
break;
380
}
381
if(not add_environment(getplugin(NULL, plugins), envdef)){
382
perror("add_environment");
383
}
395
if(not add_environment(getplugin(NULL), arg, true)){
396
perror("add_environment");
384
397
}
385
398
break;
386
case 'o':
399
case 'o': /* --options-for */
387
400
if (arg != NULL){
388
401
char *p_name = strsep(&arg, ":");
389
if(p_name[0] == '\0'){
402
if(p_name[0] == '\0' or arg == NULL){
390
403
break;
391
404
}
392
405
char *opt = strsep(&arg, ":");
393
if(opt[0] == '\0'){
406
if(opt[0] == '\0' or opt == NULL){
394
407
break;
395
408
}
396
if(opt != NULL){
397
char *p;
398
while((p = strsep(&opt, ",")) != NULL){
399
if(p[0] == '\0'){
400
continue;
401
}
402
if(not add_argument(getplugin(p_name, plugins), p)){
403
perror("add_argument");
404
return ARGP_ERR_UNKNOWN;
405
}
409
char *p;
410
while((p = strsep(&opt, ",")) != NULL){
411
if(p[0] == '\0'){
412
continue;
413
}
414
if(not add_argument(getplugin(p_name), p)){
415
perror("add_argument");
416
return ARGP_ERR_UNKNOWN;
406
417
}
407
418
}
408
419
}
409
420
break;
410
case 'f':
421
case 'E': /* --env-for */
411
422
if(arg == NULL){
412
423
break;
413
424
}
416
427
if(envdef == NULL){
417
428
break;
418
429
}
419
char *p_name = strndup(arg, (size_t) (envdef-arg));
420
if(p_name == NULL){
421
break;
422
}
423
envdef++;
424
if(not add_environment(getplugin(p_name, plugins), envdef)){
430
*envdef = '\0';
431
if(not add_environment(getplugin(arg), envdef+1, true)){
425
432
perror("add_environment");
426
433
}
427
434
}
428
435
break;
429
case 'd':
436
case 'd': /* --disable */
430
437
if (arg != NULL){
431
plugin *p = getplugin(arg, plugins);
438
plugin *p = getplugin(arg);
432
439
if(p == NULL){
433
440
return ARGP_ERR_UNKNOWN;
434
441
}
435
442
p->disabled = true;
436
443
}
437
444
break;
438
case 128:
439
plugindir = arg;
440
break;
441
case 129:
445
case 'e': /* --enable */
446
if (arg != NULL){
447
plugin *p = getplugin(arg);
448
if(p == NULL){
449
return ARGP_ERR_UNKNOWN;
450
}
451
p->disabled = false;
452
}
453
break;
454
case 128: /* --plugin-dir */
455
free(plugindir);
456
plugindir = strdup(arg);
457
if(plugindir == NULL){
458
perror("strdup");
459
}
460
break;
461
case 129: /* --config-file */
462
/* This is already done by parse_opt_config_file() */
463
break;
464
case 130: /* --userid */
442
465
uid = (uid_t)strtol(arg, NULL, 10);
443
466
break;
444
case 130:
467
case 131: /* --groupid */
445
468
gid = (gid_t)strtol(arg, NULL, 10);
446
469
break;
447
case 131:
470
case 132: /* --debug */
448
471
debug = true;
449
472
break;
450
473
case ARGP_KEY_ARG:
451
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
452
break;
453
case ARGP_KEY_END:
454
break;
455
default:
456
return ARGP_ERR_UNKNOWN;
457
}
458
return 0;
459
}
460
461
plugin *plugin_list = NULL;
462
463
struct argp argp = { .options = options, .parser = parse_opt,
464
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
474
/* Cryptsetup always passes an argument, which is an empty
475
string if "none" was specified in /etc/crypttab. So if
476
argument was empty, we ignore it silently. */
477
if(arg[0] != '\0'){
478
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
479
}
480
break;
481
case ARGP_KEY_END:
482
break;
483
default:
484
return ARGP_ERR_UNKNOWN;
485
}
486
return 0;
487
}
488
489
/* This option parser is the same as parse_opt() above, except it
490
ignores everything but the --config-file option. */
491
error_t parse_opt_config_file (int key, char *arg,
492
__attribute__((unused))
493
struct argp_state *state) {
494
switch (key) {
495
case 'g': /* --global-options */
496
case 'G': /* --global-env */
497
case 'o': /* --options-for */
498
case 'E': /* --env-for */
499
case 'd': /* --disable */
500
case 'e': /* --enable */
501
case 128: /* --plugin-dir */
502
break;
503
case 129: /* --config-file */
504
free(argfile);
505
argfile = strdup(arg);
506
if(argfile == NULL){
507
perror("strdup");
508
}
509
break;
510
case 130: /* --userid */
511
case 131: /* --groupid */
512
case 132: /* --debug */
513
case ARGP_KEY_ARG:
514
case ARGP_KEY_END:
515
break;
516
default:
517
return ARGP_ERR_UNKNOWN;
518
}
519
return 0;
520
}
521
522
struct argp argp = { .options = options,
523
.parser = parse_opt_config_file,
524
.args_doc = "",
465
525
.doc = "Mandos plugin runner -- Run plugins" };
466
526
467
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
527
/* Parse using the parse_opt_config_file in order to get the custom
528
config file location, if any. */
529
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
468
530
if (ret == ARGP_ERR_UNKNOWN){
469
531
fprintf(stderr, "Unknown error while parsing arguments\n");
470
532
exitstatus = EXIT_FAILURE;
471
533
goto fallback;
472
534
}
473
474
conffp = fopen(argfile, "r");
535
536
/* Reset to the normal argument parser */
537
argp.parser = parse_opt;
538
539
/* Open the configfile if available */
540
if (argfile == NULL){
541
conffp = fopen(AFILE, "r");
542
} else {
543
conffp = fopen(argfile, "r");
544
}
475
545
if(conffp != NULL){
476
546
char *org_line = NULL;
477
547
char *p, *arg, *new_arg, *line;
480
550
const char whitespace_delims[] = " \r\t\f\v\n";
481
551
const char comment_delim[] = "#";
482
552
553
custom_argc = 1;
554
custom_argv = malloc(sizeof(char*) * 2);
555
if(custom_argv == NULL){
556
perror("malloc");
557
exitstatus = EXIT_FAILURE;
558
goto fallback;
559
}
560
custom_argv[0] = argv[0];
561
custom_argv[1] = NULL;
562
563
/* for each line in the config file, strip whitespace and ignore
564
commented text */
483
565
while(true){
484
566
sret = getline(&org_line, &size, conffp);
485
567
if(sret == -1){
493
575
continue;
494
576
}
495
577
new_arg = strdup(p);
496
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
497
if (custom_argv == NULL){
498
perror("add_to_argv");
499
exitstatus = EXIT_FAILURE;
500
goto fallback;
501
}
578
if(new_arg == NULL){
579
perror("strdup");
580
exitstatus = EXIT_FAILURE;
581
free(org_line);
582
goto fallback;
583
}
584
585
custom_argc += 1;
586
custom_argv = realloc(custom_argv, sizeof(char *)
587
* ((unsigned int) custom_argc + 1));
588
if(custom_argv == NULL){
589
perror("realloc");
590
exitstatus = EXIT_FAILURE;
591
free(org_line);
592
goto fallback;
593
}
594
custom_argv[custom_argc-1] = new_arg;
595
custom_argv[custom_argc] = NULL;
502
596
}
503
597
}
504
598
free(org_line);
505
} else{
599
} else {
506
600
/* Check for harmful errors and go to fallback. Other errors might
507
601
not affect opening plugins */
508
602
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
511
605
goto fallback;
512
606
}
513
607
}
514
608
/* If there was any arguments from configuration file,
609
pass them to parser as command arguments */
515
610
if(custom_argv != NULL){
516
custom_argv[0] = argv[0];
517
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0,
518
&plugin_list);
611
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
612
0, NULL);
519
613
if (ret == ARGP_ERR_UNKNOWN){
520
614
fprintf(stderr, "Unknown error while parsing arguments\n");
521
615
exitstatus = EXIT_FAILURE;
523
617
}
524
618
}
525
619
620
/* Parse actual command line arguments, to let them override the
621
config file */
622
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
623
if (ret == ARGP_ERR_UNKNOWN){
624
fprintf(stderr, "Unknown error while parsing arguments\n");
625
exitstatus = EXIT_FAILURE;
626
goto fallback;
627
}
628
526
629
if(debug){
527
630
for(plugin *p = plugin_list; p != NULL; p=p->next){
528
631
fprintf(stderr, "Plugin: %s has %d arguments\n",
537
640
}
538
641
}
539
642
643
/* Strip permissions down to nobody */
540
644
ret = setuid(uid);
541
645
if (ret == -1){
542
646
perror("setuid");
543
}
544
647
}
545
648
setgid(gid);
546
649
if (ret == -1){
547
650
perror("setgid");
548
651
}
549
652
550
dir = opendir(plugindir);
653
if (plugindir == NULL){
654
dir = opendir(PDIR);
655
} else {
656
dir = opendir(plugindir);
657
}
658
551
659
if(dir == NULL){
552
660
perror("Could not open plugin dir");
553
661
exitstatus = EXIT_FAILURE;
569
677
570
678
FD_ZERO(&rfds_all);
571
679
680
/* Read and execute any executable in the plugin directory*/
572
681
while(true){
573
682
dirst = readdir(dir);
574
683
575
// All directory entries have been processed
684
/* All directory entries have been processed */
576
685
if(dirst == NULL){
577
686
if (errno == EBADF){
578
687
perror("readdir");
584
693
585
694
d_name_len = strlen(dirst->d_name);
586
695
587
// Ignore dotfiles, backup files and other junk
696
/* Ignore dotfiles, backup files and other junk */
588
697
{
589
698
bool bad_name = false;
590
699
592
701
593
702
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
594
703
".dpkg-old",
704
".dpkg-bak",
595
705
".dpkg-divert", NULL };
596
706
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
597
707
size_t pre_len = strlen(*pre);
605
715
break;
606
716
}
607
717
}
608
609
718
if(bad_name){
610
719
continue;
611
720
}
612
613
721
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
614
722
size_t suf_len = strlen(*suf);
615
723
if((d_name_len >= suf_len)
630
738
}
631
739
632
740
char *filename;
633
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
741
if(plugindir == NULL){
742
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
743
} else {
744
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
745
}
634
746
if(ret < 0){
635
747
perror("asprintf");
636
748
continue;
642
754
free(filename);
643
755
continue;
644
756
}
645
757
758
/* Ignore non-executable files */
646
759
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
647
760
if(debug){
648
761
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
651
764
free(filename);
652
765
continue;
653
766
}
654
plugin *p = getplugin(dirst->d_name, &plugin_list);
767
768
plugin *p = getplugin(dirst->d_name);
655
769
if(p == NULL){
656
770
perror("getplugin");
657
771
free(filename);
667
781
}
668
782
{
669
783
/* Add global arguments to argument list for this plugin */
670
plugin *g = getplugin(NULL, &plugin_list);
784
plugin *g = getplugin(NULL);
671
785
if(g != NULL){
672
786
for(char **a = g->argv + 1; *a != NULL; a++){
673
787
if(not add_argument(p, *a)){
676
790
}
677
791
/* Add global environment variables */
678
792
for(char **e = g->environ; *e != NULL; e++){
679
if(not add_environment(p, *e)){
793
if(not add_environment(p, *e, false)){
680
794
perror("add_environment");
681
795
}
682
796
}
687
801
process, too. */
688
802
if(p->environ[0] != NULL){
689
803
for(char **e = environ; *e != NULL; e++){
690
char *copy = strdup(*e);
691
if(copy == NULL){
692
perror("strdup");
693
continue;
694
}
695
if(not add_environment(p, copy)){
804
if(not add_environment(p, *e, false)){
696
805
perror("add_environment");
697
806
}
698
807
}
705
814
exitstatus = EXIT_FAILURE;
706
815
goto fallback;
707
816
}
817
/* Ask OS to automatic close the pipe on exec */
708
818
ret = set_cloexec_flag(pipefd[0]);
709
819
if(ret < 0){
710
820
perror("set_cloexec_flag");
724
834
exitstatus = EXIT_FAILURE;
725
835
goto fallback;
726
836
}
727
// Starting a new process to be watched
837
/* Starting a new process to be watched */
728
838
pid_t pid = fork();
729
839
if(pid == -1){
730
840
perror("fork");
738
848
perror("sigaction");
739
849
_exit(EXIT_FAILURE);
740
850
}
741
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
851
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
742
852
if(ret < 0){
743
853
perror("sigprocmask");
744
854
_exit(EXIT_FAILURE);
745
855
}
746
856
747
857
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
748
858
if(ret == -1){
749
859
perror("dup2");
768
878
}
769
879
/* no return */
770
880
}
771
/* parent process */
881
/* Parent process */
882
close(pipefd[1]); /* Close unused write end of pipe */
772
883
free(filename);
773
close(pipefd[1]); /* close unused write end of pipe */
774
process *new_process = malloc(sizeof(process));
775
if (new_process == NULL){
776
perror("malloc");
884
plugin *new_plugin = getplugin(dirst->d_name);
885
if (new_plugin == NULL){
886
perror("getplugin");
777
887
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
778
888
if(ret < 0){
779
perror("sigprocmask");
889
perror("sigprocmask");
780
890
}
781
891
exitstatus = EXIT_FAILURE;
782
892
goto fallback;
783
893
}
784
894
785
*new_process = (struct process){ .pid = pid,
786
.fd = pipefd[0],
787
.next = process_list };
788
// List handling
789
process_list = new_process;
895
new_plugin->pid = pid;
896
new_plugin->fd = pipefd[0];
897
790
898
/* Unblock SIGCHLD so signal handler can be run if this process
791
899
has already completed */
792
900
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
796
904
goto fallback;
797
905
}
798
906
799
FD_SET(new_process->fd, &rfds_all);
907
FD_SET(new_plugin->fd, &rfds_all);
800
908
801
if (maxfd < new_process->fd){
802
maxfd = new_process->fd;
909
if (maxfd < new_plugin->fd){
910
maxfd = new_plugin->fd;
803
911
}
804
805
912
}
806
913
807
free_plugin_list(plugin_list);
808
plugin_list = NULL;
809
810
914
closedir(dir);
811
915
dir = NULL;
812
813
if (process_list == NULL){
814
fprintf(stderr, "No plugin processes started. Incorrect plugin"
815
" directory?\n");
816
process_list = NULL;
916
917
for(plugin *p = plugin_list; p != NULL; p = p->next){
918
if(p->pid != 0){
919
break;
920
}
921
if(p->next == NULL){
922
fprintf(stderr, "No plugin processes started. Incorrect plugin"
923
" directory?\n");
924
free_plugin_list();
925
}
817
926
}
818
while(process_list){
927
928
/* Main loop while running plugins exist */
929
while(plugin_list){
819
930
fd_set rfds = rfds_all;
820
931
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
821
932
if (select_ret == -1){
825
936
}
826
937
/* OK, now either a process completed, or something can be read
827
938
from one of them */
828
for(process *proc = process_list; proc ; proc = proc->next){
939
for(plugin *proc = plugin_list; proc != NULL;){
829
940
/* Is this process completely done? */
830
941
if(proc->eof and proc->completed){
831
942
/* Only accept the plugin output if it exited cleanly */
832
943
if(not WIFEXITED(proc->status)
833
944
or WEXITSTATUS(proc->status) != 0){
834
945
/* Bad exit by plugin */
946
835
947
if(debug){
836
948
if(WIFEXITED(proc->status)){
837
949
fprintf(stderr, "Plugin %u exited with status %d\n",
846
958
(unsigned int) (proc->pid));
847
959
}
848
960
}
961
849
962
/* Remove the plugin */
850
963
FD_CLR(proc->fd, &rfds_all);
964
851
965
/* Block signal while modifying process_list */
852
966
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
853
967
if(ret < 0){
855
969
exitstatus = EXIT_FAILURE;
856
970
goto fallback;
857
971
}
858
/* Delete this process entry from the list */
859
if(process_list == proc){
860
/* First one - simple */
861
process_list = proc->next;
862
} else {
863
/* Second one or later */
864
for(process *p = process_list; p != NULL; p = p->next){
865
if(p->next == proc){
866
p->next = proc->next;
867
break;
868
}
869
}
870
}
972
973
plugin *next_plugin = proc->next;
974
free_plugin(proc);
975
proc = next_plugin;
976
871
977
/* We are done modifying process list, so unblock signal */
872
978
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
873
979
NULL);
874
980
if(ret < 0){
875
981
perror("sigprocmask");
876
}
877
free(proc->buffer);
878
free(proc);
879
/* We deleted this process from the list, so we can't go
880
proc->next. Therefore, start over from the beginning of
881
the process list */
882
break;
982
exitstatus = EXIT_FAILURE;
983
goto fallback;
984
}
985
986
if(plugin_list == NULL){
987
break;
988
}
989
990
continue;
883
991
}
992
884
993
/* This process exited nicely, so print its buffer */
885
994
886
995
bool bret = print_out_password(proc->buffer,
887
996
proc->buffer_length);
888
997
if(not bret){
891
1000
}
892
1001
goto fallback;
893
1002
}
1003
894
1004
/* This process has not completed. Does it have any output? */
895
1005
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
896
1006
/* This process had nothing to say at this time */
1007
proc = proc->next;
897
1008
continue;
898
1009
}
899
1010
/* Before reading, make the process' data buffer large enough */
912
1023
BUFFER_SIZE);
913
1024
if(ret < 0){
914
1025
/* Read error from this process; ignore the error */
1026
proc = proc->next;
915
1027
continue;
916
1028
}
917
1029
if(ret == 0){
926
1038
927
1039
fallback:
928
1040
929
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1041
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
930
1042
/* Fallback if all plugins failed, none are found or an error
931
1043
occured */
932
1044
bool bret;
933
1045
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
934
1046
char *passwordbuffer = getpass("Password: ");
935
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1047
size_t len = strlen(passwordbuffer);
1048
/* Strip trailing newline */
1049
if(len > 0 and passwordbuffer[len-1] == '\n'){
1050
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1051
len--;
1052
}
1053
bret = print_out_password(passwordbuffer, len);
936
1054
if(not bret){
937
1055
perror("print_out_password");
938
1056
exitstatus = EXIT_FAILURE;
945
1063
perror("sigaction");
946
1064
exitstatus = EXIT_FAILURE;
947
1065
}
948
1066
949
1067
if(custom_argv != NULL){
950
for(char **arg = custom_argv; *arg != NULL; arg++){
1068
for(char **arg = custom_argv+1; *arg != NULL; arg++){
951
1069
free(*arg);
952
1070
}
953
1071
free(custom_argv);
954
1072
}
955
free_plugin_list(plugin_list);
956
1073
957
1074
if(dir != NULL){
958
1075
closedir(dir);
959
1076
}
960
1077
961
/* Free the process list and kill the processes */
962
for(process *next; process_list != NULL; process_list = next){
963
next = process_list->next;
964
close(process_list->fd);
965
ret = kill(process_list->pid, SIGTERM);
966
if(ret == -1 and errno != ESRCH){
967
/* set-uid proccesses migth not get closed */
968
perror("kill");
1078
/* Kill the processes */
1079
for(plugin *p = plugin_list; p != NULL; p = p->next){
1080
if(p->pid != 0){
1081
close(p->fd);
1082
ret = kill(p->pid, SIGTERM);
1083
if(ret == -1 and errno != ESRCH){
1084
/* Set-uid proccesses might not get closed */
1085
perror("kill");
1086
}
969
1087
}
970
free(process_list->buffer);
971
free(process_list);
972
1088
}
973
1089
974
1090
/* Wait for any remaining child processes to terminate */
979
1095
perror("wait");
980
1096
}
981
1097
1098
free_plugin_list();
1099
1100
free(plugindir);
1101
free(argfile);
1102
982
1103
return exitstatus;
983
1104
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0