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 258
- compare with another revision
- download diff
- download tarball
- view history from revision 258
- Committer: Teddy Hogeborn
- Date: 2009-01-10 01:14:02 UTC
- mfrom: (257.1.1 mandos)
- Revision ID: teddy@fukt.bsnet.se-20090110011402-lils5ov6elqmk0sh
Fix compilation error on AMD64, thanks to Frans Pop
<elendil@planet.nl> for the report, thanks to Mooie <mooie@cow.se> for
the fix:
* Makefile (FORTIFY): Replaced "-pie" with "-fPIC".
(LINK_FORTIFY): Renamed to "LINK_FORTIFY_LD" and added "-fPIE".
(LINK_FORTIFY): New; set to "-pie".
(LDFLAGS): Also include "$(LINK_FORTIFY)" (unmodified).
<elendil@planet.nl> for the report, thanks to Mooie <mooie@cow.se> for
the fix:
* Makefile (FORTIFY): Replaced "-pie" with "-fPIC".
(LINK_FORTIFY): Renamed to "LINK_FORTIFY_LD" and added "-fPIE".
(LINK_FORTIFY): New; set to "-pie".
(LDFLAGS): Also include "$(LINK_FORTIFY)" (unmodified).
- 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 © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 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
static void free_plugin_list(plugin *plugin_list){
251
for(plugin *next; plugin_list != NULL; plugin_list = next){
252
next = plugin_list->next;
253
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
254
free(*arg);
255
}
256
free(plugin_list->argv);
257
for(char **env = plugin_list->environ; *env != NULL; env++){
258
free(*env);
259
}
260
free(plugin_list->environ);
261
free(plugin_list);
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
}
290
}
291
}
292
293
free(plugin_node);
294
}
295
296
static void free_plugin_list(void){
297
while(plugin_list != NULL){
298
free_plugin(plugin_list);
262
299
}
263
300
}
264
301
265
302
int main(int argc, char *argv[]){
266
const char *plugindir = "/lib/mandos/plugins.d";
267
const char *argfile = ARGFILE;
303
char *plugindir = NULL;
304
char *argfile = NULL;
268
305
FILE *conffp;
269
306
size_t d_name_len;
270
307
DIR *dir = NULL;
272
309
struct stat st;
273
310
fd_set rfds_all;
274
311
int ret, maxfd = 0;
312
ssize_t sret;
275
313
uid_t uid = 65534;
276
314
gid_t gid = 65534;
277
315
bool debug = false;
302
340
{ .name = "global-options", .key = 'g',
303
341
.arg = "OPTION[,OPTION[,...]]",
304
342
.doc = "Options passed to all plugins" },
305
{ .name = "global-envs", .key = 'e',
343
{ .name = "global-env", .key = 'G',
306
344
.arg = "VAR=value",
307
345
.doc = "Environment variable passed to all plugins" },
308
346
{ .name = "options-for", .key = 'o',
309
347
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
310
348
.doc = "Options passed only to specified plugin" },
311
{ .name = "envs-for", .key = 'f',
349
{ .name = "env-for", .key = 'E',
312
350
.arg = "PLUGIN:ENV=value",
313
351
.doc = "Environment variable passed to specified plugin" },
314
352
{ .name = "disable", .key = 'd',
315
353
.arg = "PLUGIN",
316
354
.doc = "Disable a specific plugin", .group = 1 },
355
{ .name = "enable", .key = 'e',
356
.arg = "PLUGIN",
357
.doc = "Enable a specific plugin", .group = 1 },
317
358
{ .name = "plugin-dir", .key = 128,
318
359
.arg = "DIRECTORY",
319
360
.doc = "Specify a different plugin directory", .group = 2 },
320
{ .name = "userid", .key = 129,
321
.arg = "ID", .flags = 0,
322
.doc = "User ID the plugins will run as", .group = 2 },
323
{ .name = "groupid", .key = 130,
324
.arg = "ID", .flags = 0,
325
.doc = "Group ID the plugins will run as", .group = 2 },
326
{ .name = "debug", .key = 131,
327
.doc = "Debug mode", .group = 3 },
361
{ .name = "config-file", .key = 129,
362
.arg = "FILE",
363
.doc = "Specify a different configuration file", .group = 2 },
364
{ .name = "userid", .key = 130,
365
.arg = "ID", .flags = 0,
366
.doc = "User ID the plugins will run as", .group = 3 },
367
{ .name = "groupid", .key = 131,
368
.arg = "ID", .flags = 0,
369
.doc = "Group ID the plugins will run as", .group = 3 },
370
{ .name = "debug", .key = 132,
371
.doc = "Debug mode", .group = 4 },
328
372
{ .name = NULL }
329
373
};
330
374
331
error_t parse_opt (int key, char *arg, struct argp_state *state) {
332
/* Get the INPUT argument from `argp_parse', which we know is a
333
pointer to our plugin list pointer. */
334
plugin **plugins = state->input;
375
error_t parse_opt (int key, char *arg, __attribute__((unused))
376
struct argp_state *state) {
335
377
switch (key) {
336
case 'g':
378
case 'g': /* --global-options */
337
379
if (arg != NULL){
338
380
char *p;
339
381
while((p = strsep(&arg, ",")) != NULL){
340
382
if(p[0] == '\0'){
341
383
continue;
342
384
}
343
if(not add_argument(getplugin(NULL, plugins), p)){
385
if(not add_argument(getplugin(NULL), p)){
344
386
perror("add_argument");
345
387
return ARGP_ERR_UNKNOWN;
346
388
}
347
389
}
348
390
}
349
391
break;
350
case 'e':
392
case 'G': /* --global-env */
351
393
if(arg == NULL){
352
394
break;
353
395
}
354
{
355
char *envdef = strdup(arg);
356
if(envdef == NULL){
357
break;
358
}
359
if(not add_environment(getplugin(NULL, plugins), envdef)){
360
perror("add_environment");
361
}
396
if(not add_environment(getplugin(NULL), arg, true)){
397
perror("add_environment");
362
398
}
363
399
break;
364
case 'o':
400
case 'o': /* --options-for */
365
401
if (arg != NULL){
366
402
char *p_name = strsep(&arg, ":");
367
if(p_name[0] == '\0'){
403
if(p_name[0] == '\0' or arg == NULL){
368
404
break;
369
405
}
370
406
char *opt = strsep(&arg, ":");
371
if(opt[0] == '\0'){
407
if(opt[0] == '\0' or opt == NULL){
372
408
break;
373
409
}
374
if(opt != NULL){
375
char *p;
376
while((p = strsep(&opt, ",")) != NULL){
377
if(p[0] == '\0'){
378
continue;
379
}
380
if(not add_argument(getplugin(p_name, plugins), p)){
381
perror("add_argument");
382
return ARGP_ERR_UNKNOWN;
383
}
410
char *p;
411
while((p = strsep(&opt, ",")) != NULL){
412
if(p[0] == '\0'){
413
continue;
414
}
415
if(not add_argument(getplugin(p_name), p)){
416
perror("add_argument");
417
return ARGP_ERR_UNKNOWN;
384
418
}
385
419
}
386
420
}
387
421
break;
388
case 'f':
422
case 'E': /* --env-for */
389
423
if(arg == NULL){
390
424
break;
391
425
}
394
428
if(envdef == NULL){
395
429
break;
396
430
}
397
char *p_name = strndup(arg, (size_t) (envdef-arg));
398
if(p_name == NULL){
399
break;
400
}
401
envdef++;
402
if(not add_environment(getplugin(p_name, plugins), envdef)){
431
*envdef = '\0';
432
if(not add_environment(getplugin(arg), envdef+1, true)){
403
433
perror("add_environment");
404
434
}
405
435
}
406
436
break;
407
case 'd':
437
case 'd': /* --disable */
408
438
if (arg != NULL){
409
plugin *p = getplugin(arg, plugins);
439
plugin *p = getplugin(arg);
410
440
if(p == NULL){
411
441
return ARGP_ERR_UNKNOWN;
412
442
}
413
443
p->disabled = true;
414
444
}
415
445
break;
416
case 128:
417
plugindir = arg;
418
break;
419
case 129:
446
case 'e': /* --enable */
447
if (arg != NULL){
448
plugin *p = getplugin(arg);
449
if(p == NULL){
450
return ARGP_ERR_UNKNOWN;
451
}
452
p->disabled = false;
453
}
454
break;
455
case 128: /* --plugin-dir */
456
free(plugindir);
457
plugindir = strdup(arg);
458
if(plugindir == NULL){
459
perror("strdup");
460
}
461
break;
462
case 129: /* --config-file */
463
/* This is already done by parse_opt_config_file() */
464
break;
465
case 130: /* --userid */
420
466
uid = (uid_t)strtol(arg, NULL, 10);
421
467
break;
422
case 130:
468
case 131: /* --groupid */
423
469
gid = (gid_t)strtol(arg, NULL, 10);
424
470
break;
425
case 131:
471
case 132: /* --debug */
426
472
debug = true;
427
473
break;
428
474
case ARGP_KEY_ARG:
429
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
430
break;
431
case ARGP_KEY_END:
432
break;
433
default:
434
return ARGP_ERR_UNKNOWN;
435
}
436
return 0;
437
}
438
439
plugin *plugin_list = NULL;
440
441
struct argp argp = { .options = options, .parser = parse_opt,
442
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
475
/* Cryptsetup always passes an argument, which is an empty
476
string if "none" was specified in /etc/crypttab. So if
477
argument was empty, we ignore it silently. */
478
if(arg[0] != '\0'){
479
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
480
}
481
break;
482
case ARGP_KEY_END:
483
break;
484
default:
485
return ARGP_ERR_UNKNOWN;
486
}
487
return 0;
488
}
489
490
/* This option parser is the same as parse_opt() above, except it
491
ignores everything but the --config-file option. */
492
error_t parse_opt_config_file (int key, char *arg,
493
__attribute__((unused))
494
struct argp_state *state) {
495
switch (key) {
496
case 'g': /* --global-options */
497
case 'G': /* --global-env */
498
case 'o': /* --options-for */
499
case 'E': /* --env-for */
500
case 'd': /* --disable */
501
case 'e': /* --enable */
502
case 128: /* --plugin-dir */
503
break;
504
case 129: /* --config-file */
505
free(argfile);
506
argfile = strdup(arg);
507
if(argfile == NULL){
508
perror("strdup");
509
}
510
break;
511
case 130: /* --userid */
512
case 131: /* --groupid */
513
case 132: /* --debug */
514
case ARGP_KEY_ARG:
515
case ARGP_KEY_END:
516
break;
517
default:
518
return ARGP_ERR_UNKNOWN;
519
}
520
return 0;
521
}
522
523
struct argp argp = { .options = options,
524
.parser = parse_opt_config_file,
525
.args_doc = "",
443
526
.doc = "Mandos plugin runner -- Run plugins" };
444
527
445
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
528
/* Parse using the parse_opt_config_file in order to get the custom
529
config file location, if any. */
530
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
446
531
if (ret == ARGP_ERR_UNKNOWN){
447
532
fprintf(stderr, "Unknown error while parsing arguments\n");
448
533
exitstatus = EXIT_FAILURE;
449
534
goto fallback;
450
535
}
451
452
conffp = fopen(argfile, "r");
536
537
/* Reset to the normal argument parser */
538
argp.parser = parse_opt;
539
540
/* Open the configfile if available */
541
if (argfile == NULL){
542
conffp = fopen(AFILE, "r");
543
} else {
544
conffp = fopen(argfile, "r");
545
}
453
546
if(conffp != NULL){
454
547
char *org_line = NULL;
455
548
char *p, *arg, *new_arg, *line;
456
549
size_t size = 0;
457
ssize_t sret;
458
550
const char whitespace_delims[] = " \r\t\f\v\n";
459
551
const char comment_delim[] = "#";
460
552
467
559
}
468
560
custom_argv[0] = argv[0];
469
561
custom_argv[1] = NULL;
470
562
563
/* for each line in the config file, strip whitespace and ignore
564
commented text */
471
565
while(true){
472
566
sret = getline(&org_line, &size, conffp);
473
567
if(sret == -1){
481
575
continue;
482
576
}
483
577
new_arg = strdup(p);
484
578
if(new_arg == NULL){
579
perror("strdup");
580
exitstatus = EXIT_FAILURE;
581
free(org_line);
582
goto fallback;
583
}
584
485
585
custom_argc += 1;
486
586
custom_argv = realloc(custom_argv, sizeof(char *)
487
587
* ((unsigned int) custom_argc + 1));
496
596
}
497
597
}
498
598
free(org_line);
499
} else{
599
} else {
500
600
/* Check for harmful errors and go to fallback. Other errors might
501
601
not affect opening plugins */
502
602
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
505
605
goto fallback;
506
606
}
507
607
}
508
608
/* If there was any arguments from configuration file,
609
pass them to parser as command arguments */
509
610
if(custom_argv != NULL){
510
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
611
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
612
0, NULL);
511
613
if (ret == ARGP_ERR_UNKNOWN){
512
614
fprintf(stderr, "Unknown error while parsing arguments\n");
513
615
exitstatus = EXIT_FAILURE;
515
617
}
516
618
}
517
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
518
629
if(debug){
519
630
for(plugin *p = plugin_list; p != NULL; p=p->next){
520
631
fprintf(stderr, "Plugin: %s has %d arguments\n",
529
640
}
530
641
}
531
642
643
/* Strip permissions down to nobody */
532
644
ret = setuid(uid);
533
645
if (ret == -1){
534
646
perror("setuid");
535
}
536
647
}
537
648
setgid(gid);
538
649
if (ret == -1){
539
650
perror("setgid");
540
651
}
541
652
542
dir = opendir(plugindir);
653
if (plugindir == NULL){
654
dir = opendir(PDIR);
655
} else {
656
dir = opendir(plugindir);
657
}
658
543
659
if(dir == NULL){
544
660
perror("Could not open plugin dir");
545
661
exitstatus = EXIT_FAILURE;
561
677
562
678
FD_ZERO(&rfds_all);
563
679
680
/* Read and execute any executable in the plugin directory*/
564
681
while(true){
565
682
dirst = readdir(dir);
566
683
567
// All directory entries have been processed
684
/* All directory entries have been processed */
568
685
if(dirst == NULL){
569
686
if (errno == EBADF){
570
687
perror("readdir");
576
693
577
694
d_name_len = strlen(dirst->d_name);
578
695
579
// Ignore dotfiles, backup files and other junk
696
/* Ignore dotfiles, backup files and other junk */
580
697
{
581
698
bool bad_name = false;
582
699
584
701
585
702
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
586
703
".dpkg-old",
704
".dpkg-bak",
587
705
".dpkg-divert", NULL };
588
706
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
589
707
size_t pre_len = strlen(*pre);
597
715
break;
598
716
}
599
717
}
600
601
718
if(bad_name){
602
719
continue;
603
720
}
604
605
721
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
606
722
size_t suf_len = strlen(*suf);
607
723
if((d_name_len >= suf_len)
622
738
}
623
739
624
740
char *filename;
625
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
}
626
746
if(ret < 0){
627
747
perror("asprintf");
628
748
continue;
634
754
free(filename);
635
755
continue;
636
756
}
637
757
758
/* Ignore non-executable files */
638
759
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
639
760
if(debug){
640
761
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
643
764
free(filename);
644
765
continue;
645
766
}
646
plugin *p = getplugin(dirst->d_name, &plugin_list);
767
768
plugin *p = getplugin(dirst->d_name);
647
769
if(p == NULL){
648
770
perror("getplugin");
649
771
free(filename);
659
781
}
660
782
{
661
783
/* Add global arguments to argument list for this plugin */
662
plugin *g = getplugin(NULL, &plugin_list);
784
plugin *g = getplugin(NULL);
663
785
if(g != NULL){
664
786
for(char **a = g->argv + 1; *a != NULL; a++){
665
787
if(not add_argument(p, *a)){
668
790
}
669
791
/* Add global environment variables */
670
792
for(char **e = g->environ; *e != NULL; e++){
671
if(not add_environment(p, *e)){
793
if(not add_environment(p, *e, false)){
672
794
perror("add_environment");
673
795
}
674
796
}
679
801
process, too. */
680
802
if(p->environ[0] != NULL){
681
803
for(char **e = environ; *e != NULL; e++){
682
char *copy = strdup(*e);
683
if(copy == NULL){
684
perror("strdup");
685
continue;
686
}
687
if(not add_environment(p, copy)){
804
if(not add_environment(p, *e, false)){
688
805
perror("add_environment");
689
806
}
690
807
}
697
814
exitstatus = EXIT_FAILURE;
698
815
goto fallback;
699
816
}
817
/* Ask OS to automatic close the pipe on exec */
700
818
ret = set_cloexec_flag(pipefd[0]);
701
819
if(ret < 0){
702
820
perror("set_cloexec_flag");
716
834
exitstatus = EXIT_FAILURE;
717
835
goto fallback;
718
836
}
719
// Starting a new process to be watched
837
/* Starting a new process to be watched */
720
838
pid_t pid = fork();
721
839
if(pid == -1){
722
840
perror("fork");
730
848
perror("sigaction");
731
849
_exit(EXIT_FAILURE);
732
850
}
733
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
851
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
734
852
if(ret < 0){
735
853
perror("sigprocmask");
736
854
_exit(EXIT_FAILURE);
737
855
}
738
856
739
857
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
740
858
if(ret == -1){
741
859
perror("dup2");
760
878
}
761
879
/* no return */
762
880
}
763
/* parent process */
881
/* Parent process */
882
close(pipefd[1]); /* Close unused write end of pipe */
764
883
free(filename);
765
close(pipefd[1]); /* close unused write end of pipe */
766
process *new_process = malloc(sizeof(process));
767
if (new_process == NULL){
768
perror("malloc");
884
plugin *new_plugin = getplugin(dirst->d_name);
885
if (new_plugin == NULL){
886
perror("getplugin");
769
887
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
770
888
if(ret < 0){
771
perror("sigprocmask");
889
perror("sigprocmask");
772
890
}
773
891
exitstatus = EXIT_FAILURE;
774
892
goto fallback;
775
893
}
776
894
777
*new_process = (struct process){ .pid = pid,
778
.fd = pipefd[0],
779
.next = process_list };
780
// List handling
781
process_list = new_process;
895
new_plugin->pid = pid;
896
new_plugin->fd = pipefd[0];
897
782
898
/* Unblock SIGCHLD so signal handler can be run if this process
783
899
has already completed */
784
900
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
788
904
goto fallback;
789
905
}
790
906
791
FD_SET(new_process->fd, &rfds_all);
907
FD_SET(new_plugin->fd, &rfds_all);
792
908
793
if (maxfd < new_process->fd){
794
maxfd = new_process->fd;
909
if (maxfd < new_plugin->fd){
910
maxfd = new_plugin->fd;
795
911
}
796
797
912
}
798
913
799
free_plugin_list(plugin_list);
800
plugin_list = NULL;
801
802
914
closedir(dir);
803
915
dir = NULL;
804
805
if (process_list == NULL){
806
fprintf(stderr, "No plugin processes started. Incorrect plugin"
807
" directory?\n");
808
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
}
809
926
}
810
while(process_list){
927
928
/* Main loop while running plugins exist */
929
while(plugin_list){
811
930
fd_set rfds = rfds_all;
812
931
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
813
932
if (select_ret == -1){
817
936
}
818
937
/* OK, now either a process completed, or something can be read
819
938
from one of them */
820
for(process *proc = process_list; proc ; proc = proc->next){
939
for(plugin *proc = plugin_list; proc != NULL;){
821
940
/* Is this process completely done? */
822
941
if(proc->eof and proc->completed){
823
942
/* Only accept the plugin output if it exited cleanly */
824
943
if(not WIFEXITED(proc->status)
825
944
or WEXITSTATUS(proc->status) != 0){
826
945
/* Bad exit by plugin */
946
827
947
if(debug){
828
948
if(WIFEXITED(proc->status)){
829
949
fprintf(stderr, "Plugin %u exited with status %d\n",
838
958
(unsigned int) (proc->pid));
839
959
}
840
960
}
961
841
962
/* Remove the plugin */
842
963
FD_CLR(proc->fd, &rfds_all);
964
843
965
/* Block signal while modifying process_list */
844
966
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
845
967
if(ret < 0){
847
969
exitstatus = EXIT_FAILURE;
848
970
goto fallback;
849
971
}
850
/* Delete this process entry from the list */
851
if(process_list == proc){
852
/* First one - simple */
853
process_list = proc->next;
854
} else {
855
/* Second one or later */
856
for(process *p = process_list; p != NULL; p = p->next){
857
if(p->next == proc){
858
p->next = proc->next;
859
break;
860
}
861
}
862
}
972
973
plugin *next_plugin = proc->next;
974
free_plugin(proc);
975
proc = next_plugin;
976
863
977
/* We are done modifying process list, so unblock signal */
864
978
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
865
979
NULL);
866
980
if(ret < 0){
867
981
perror("sigprocmask");
868
}
869
free(proc->buffer);
870
free(proc);
871
/* We deleted this process from the list, so we can't go
872
proc->next. Therefore, start over from the beginning of
873
the process list */
874
break;
982
exitstatus = EXIT_FAILURE;
983
goto fallback;
984
}
985
986
if(plugin_list == NULL){
987
break;
988
}
989
990
continue;
875
991
}
992
876
993
/* This process exited nicely, so print its buffer */
877
994
878
995
bool bret = print_out_password(proc->buffer,
879
996
proc->buffer_length);
880
997
if(not bret){
883
1000
}
884
1001
goto fallback;
885
1002
}
1003
886
1004
/* This process has not completed. Does it have any output? */
887
1005
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
888
1006
/* This process had nothing to say at this time */
1007
proc = proc->next;
889
1008
continue;
890
1009
}
891
1010
/* Before reading, make the process' data buffer large enough */
900
1019
proc->buffer_size += BUFFER_SIZE;
901
1020
}
902
1021
/* Read from the process */
903
ret = read(proc->fd, proc->buffer + proc->buffer_length,
904
BUFFER_SIZE);
905
if(ret < 0){
1022
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1023
BUFFER_SIZE);
1024
if(sret < 0){
906
1025
/* Read error from this process; ignore the error */
1026
proc = proc->next;
907
1027
continue;
908
1028
}
909
if(ret == 0){
1029
if(sret == 0){
910
1030
/* got EOF */
911
1031
proc->eof = true;
912
1032
} else {
913
proc->buffer_length += (size_t) ret;
1033
proc->buffer_length += (size_t) sret;
914
1034
}
915
1035
}
916
1036
}
918
1038
919
1039
fallback:
920
1040
921
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1041
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
922
1042
/* Fallback if all plugins failed, none are found or an error
923
1043
occured */
924
1044
bool bret;
925
1045
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
926
1046
char *passwordbuffer = getpass("Password: ");
927
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);
928
1054
if(not bret){
929
1055
perror("print_out_password");
930
1056
exitstatus = EXIT_FAILURE;
937
1063
perror("sigaction");
938
1064
exitstatus = EXIT_FAILURE;
939
1065
}
940
1066
941
1067
if(custom_argv != NULL){
942
1068
for(char **arg = custom_argv+1; *arg != NULL; arg++){
943
1069
free(*arg);
944
1070
}
945
1071
free(custom_argv);
946
1072
}
947
free_plugin_list(plugin_list);
948
1073
949
1074
if(dir != NULL){
950
1075
closedir(dir);
951
1076
}
952
1077
953
/* Free the process list and kill the processes */
954
for(process *next; process_list != NULL; process_list = next){
955
next = process_list->next;
956
close(process_list->fd);
957
ret = kill(process_list->pid, SIGTERM);
958
if(ret == -1 and errno != ESRCH){
959
/* set-uid proccesses migth not get closed */
960
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
}
961
1087
}
962
free(process_list->buffer);
963
free(process_list);
964
1088
}
965
1089
966
1090
/* Wait for any remaining child processes to terminate */
971
1095
perror("wait");
972
1096
}
973
1097
1098
free_plugin_list();
1099
1100
free(plugindir);
1101
free(argfile);
1102
974
1103
return exitstatus;
975
1104
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0