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- Committer: Björn Påhlsson
- Date: 2008-08-25 07:54:51 UTC
- mfrom: (105 mandos)
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 107.
- Revision ID: belorn@braxen-20080825075451-e8paccr1qwxg7p4p
merge
- files added:
- plugins.d/usplash
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
7
6
*
8
7
* This program is free software: you can redistribute it and/or
9
8
* modify it under the terms of the GNU General Public License as
28
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
33
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
33
stat, waitpid(), WIFEXITED(),
35
34
WEXITSTATUS(), wait(), pid_t,
47
46
fcntl(), setuid(), setgid(),
48
47
F_GETFD, F_SETFD, FD_CLOEXEC,
49
48
access(), pipe(), fork(), close()
50
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
51
50
execv(), write(), read(),
52
51
close() */
53
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
64
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
64
SIG_UNBLOCK, kill() */
66
65
#include <errno.h> /* errno, EBADF */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
68
66
69
67
#define BUFFER_SIZE 256
70
68
71
69
#define PDIR "/lib/mandos/plugins.d"
72
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
73
71
74
const char *argp_program_version = "plugin-runner " VERSION;
72
const char *argp_program_version = "plugin-runner 1.0";
75
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
76
74
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;
75
struct process;
84
76
85
/* Variables used for running processes*/
77
typedef struct process{
86
78
pid_t pid;
87
79
int fd;
88
80
char *buffer;
91
83
bool eof;
92
84
volatile bool completed;
93
85
volatile int status;
86
struct process *next;
87
} process;
88
89
typedef struct plugin{
90
char *name; /* can be NULL or any plugin name */
91
char **argv;
92
int argc;
93
char **environ;
94
int envc;
95
bool disabled;
94
96
struct plugin *next;
95
97
} plugin;
96
98
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){
104
if((p->name == name)
105
or (p->name and name and (strcmp(p->name, name) == 0))){
99
static plugin *getplugin(char *name, plugin **plugin_list){
100
for (plugin *p = *plugin_list; p != NULL; p = p->next){
101
if ((p->name == name)
102
or (p->name and name and (strcmp(p->name, name) == 0))){
106
103
return p;
107
104
}
108
105
}
109
106
/* Create a new plugin */
110
107
plugin *new_plugin = malloc(sizeof(plugin));
111
if(new_plugin == NULL){
108
if (new_plugin == NULL){
112
109
return NULL;
113
110
}
114
111
char *copy_name = NULL;
115
112
if(name != NULL){
116
113
copy_name = strdup(name);
117
114
if(copy_name == NULL){
118
free(new_plugin);
119
115
return NULL;
120
116
}
121
117
}
122
118
123
119
*new_plugin = (plugin) { .name = copy_name,
124
120
.argc = 1,
121
.envc = 0,
125
122
.disabled = false,
126
.next = plugin_list };
123
.next = *plugin_list };
127
124
128
125
new_plugin->argv = malloc(sizeof(char *) * 2);
129
if(new_plugin->argv == NULL){
126
if (new_plugin->argv == NULL){
130
127
free(copy_name);
131
128
free(new_plugin);
132
129
return NULL;
133
130
}
134
131
new_plugin->argv[0] = copy_name;
135
132
new_plugin->argv[1] = NULL;
136
133
137
134
new_plugin->environ = malloc(sizeof(char *));
138
135
if(new_plugin->environ == NULL){
139
136
free(copy_name);
142
139
return NULL;
143
140
}
144
141
new_plugin->environ[0] = NULL;
145
146
142
/* Append the new plugin to the list */
147
plugin_list = new_plugin;
143
*plugin_list = new_plugin;
148
144
return new_plugin;
149
145
}
150
146
180
176
}
181
177
182
178
/* Add to a plugin's environment */
183
static bool add_environment(plugin *p, const char *def, bool replace){
179
static bool add_environment(plugin *p, const char *def){
184
180
if(p == NULL){
185
181
return false;
186
182
}
187
/* namelen = length of name of environment variable */
188
size_t namelen = (size_t)(strchrnul(def, '=') - def);
189
/* Search for this environment variable */
190
for(char **e = p->environ; *e != NULL; e++){
191
if(strncmp(*e, def, namelen + 1) == 0){
192
/* It already exists */
193
if(replace){
194
char *new = realloc(*e, strlen(def) + 1);
195
if(new == NULL){
196
return false;
197
}
198
*e = new;
199
strcpy(*e, def);
200
}
201
return true;
202
}
203
}
204
183
return add_to_char_array(def, &(p->environ), &(p->envc));
205
184
}
206
185
186
207
187
/*
208
188
* Based on the example in the GNU LibC manual chapter 13.13 "File
209
189
* Descriptor Flags".
210
190
* *Note File Descriptor Flags:(libc)Descriptor Flags.
211
191
*/
212
static int set_cloexec_flag(int fd){
192
static int set_cloexec_flag(int fd)
193
{
213
194
int ret = fcntl(fd, F_GETFD, 0);
214
195
/* If reading the flags failed, return error indication now. */
215
196
if(ret < 0){
219
200
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
220
201
}
221
202
203
process *process_list = NULL;
222
204
223
205
/* Mark processes as completed when they exit, and save their exit
224
206
status. */
225
static void handle_sigchld(__attribute__((unused)) int sig){
207
void handle_sigchld(__attribute__((unused)) int sig){
226
208
while(true){
227
plugin *proc = plugin_list;
209
process *proc = process_list;
228
210
int status;
229
211
pid_t pid = waitpid(-1, &status, WNOHANG);
230
212
if(pid == 0){
232
214
break;
233
215
}
234
216
if(pid == -1){
235
if(errno != ECHILD){
217
if (errno != ECHILD){
236
218
perror("waitpid");
237
219
}
238
220
/* No child processes */
239
221
break;
240
222
}
241
223
242
224
/* A child exited, find it in process_list */
243
225
while(proc != NULL and proc->pid != pid){
244
226
proc = proc->next;
252
234
}
253
235
}
254
236
255
/* Prints out a password to stdout */
256
static bool print_out_password(const char *buffer, size_t length){
237
bool print_out_password(const char *buffer, size_t length){
257
238
ssize_t ret;
239
if(length>0 and buffer[length-1] == '\n'){
240
length--;
241
}
258
242
for(size_t written = 0; written < length; written += (size_t)ret){
259
243
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
260
244
length - written));
265
249
return true;
266
250
}
267
251
268
/* Removes and free a plugin from the plugin list */
269
static void free_plugin(plugin *plugin_node){
270
271
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
272
free(*arg);
273
}
274
free(plugin_node->argv);
275
for(char **env = plugin_node->environ; *env != NULL; env++){
276
free(*env);
277
}
278
free(plugin_node->environ);
279
free(plugin_node->buffer);
280
281
/* Removes the plugin from the singly-linked list */
282
if(plugin_node == plugin_list){
283
/* First one - simple */
284
plugin_list = plugin_list->next;
285
} else {
286
/* Second one or later */
287
for(plugin *p = plugin_list; p != NULL; p = p->next){
288
if(p->next == plugin_node){
289
p->next = plugin_node->next;
290
break;
291
}
292
}
293
}
294
295
free(plugin_node);
296
}
297
298
static void free_plugin_list(void){
299
while(plugin_list != NULL){
300
free_plugin(plugin_list);
252
static void free_plugin_list(plugin *plugin_list){
253
for(plugin *next; plugin_list != NULL; plugin_list = next){
254
next = plugin_list->next;
255
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
256
free(*arg);
257
}
258
free(plugin_list->argv);
259
for(char **env = plugin_list->environ; *env != NULL; env++){
260
free(*env);
261
}
262
free(plugin_list->environ);
263
free(plugin_list);
301
264
}
302
265
}
303
266
310
273
struct dirent *dirst;
311
274
struct stat st;
312
275
fd_set rfds_all;
313
int ret, numchars, maxfd = 0;
314
ssize_t sret;
315
intmax_t tmpmax;
276
int ret, maxfd = 0;
316
277
uid_t uid = 65534;
317
278
gid_t gid = 65534;
318
279
bool debug = false;
343
304
{ .name = "global-options", .key = 'g',
344
305
.arg = "OPTION[,OPTION[,...]]",
345
306
.doc = "Options passed to all plugins" },
346
{ .name = "global-env", .key = 'G',
307
{ .name = "global-envs", .key = 'e',
347
308
.arg = "VAR=value",
348
309
.doc = "Environment variable passed to all plugins" },
349
310
{ .name = "options-for", .key = 'o',
350
311
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
351
312
.doc = "Options passed only to specified plugin" },
352
{ .name = "env-for", .key = 'E',
313
{ .name = "envs-for", .key = 'f',
353
314
.arg = "PLUGIN:ENV=value",
354
315
.doc = "Environment variable passed to specified plugin" },
355
316
{ .name = "disable", .key = 'd',
356
317
.arg = "PLUGIN",
357
318
.doc = "Disable a specific plugin", .group = 1 },
358
{ .name = "enable", .key = 'e',
359
.arg = "PLUGIN",
360
.doc = "Enable a specific plugin", .group = 1 },
361
319
{ .name = "plugin-dir", .key = 128,
362
320
.arg = "DIRECTORY",
363
321
.doc = "Specify a different plugin directory", .group = 2 },
375
333
{ .name = NULL }
376
334
};
377
335
378
error_t parse_opt(int key, char *arg, __attribute__((unused))
379
struct argp_state *state) {
380
switch(key) {
381
case 'g': /* --global-options */
382
if(arg != NULL){
336
error_t parse_opt (int key, char *arg, struct argp_state *state) {
337
/* Get the INPUT argument from `argp_parse', which we know is a
338
pointer to our plugin list pointer. */
339
plugin **plugins = state->input;
340
switch (key) {
341
case 'g':
342
if (arg != NULL){
383
343
char *p;
384
344
while((p = strsep(&arg, ",")) != NULL){
385
345
if(p[0] == '\0'){
386
346
continue;
387
347
}
388
if(not add_argument(getplugin(NULL), p)){
348
if(not add_argument(getplugin(NULL, plugins), p)){
389
349
perror("add_argument");
390
350
return ARGP_ERR_UNKNOWN;
391
351
}
392
352
}
393
353
}
394
354
break;
395
case 'G': /* --global-env */
355
case 'e':
396
356
if(arg == NULL){
397
357
break;
398
358
}
399
if(not add_environment(getplugin(NULL), arg, true)){
400
perror("add_environment");
359
{
360
char *envdef = strdup(arg);
361
if(envdef == NULL){
362
break;
363
}
364
if(not add_environment(getplugin(NULL, plugins), envdef)){
365
perror("add_environment");
366
}
401
367
}
402
368
break;
403
case 'o': /* --options-for */
404
if(arg != NULL){
369
case 'o':
370
if (arg != NULL){
405
371
char *p_name = strsep(&arg, ":");
406
if(p_name[0] == '\0' or arg == NULL){
372
if(p_name[0] == '\0'){
407
373
break;
408
374
}
409
375
char *opt = strsep(&arg, ":");
410
if(opt[0] == '\0' or opt == NULL){
376
if(opt[0] == '\0'){
411
377
break;
412
378
}
413
char *p;
414
while((p = strsep(&opt, ",")) != NULL){
415
if(p[0] == '\0'){
416
continue;
417
}
418
if(not add_argument(getplugin(p_name), p)){
419
perror("add_argument");
420
return ARGP_ERR_UNKNOWN;
379
if(opt != NULL){
380
char *p;
381
while((p = strsep(&opt, ",")) != NULL){
382
if(p[0] == '\0'){
383
continue;
384
}
385
if(not add_argument(getplugin(p_name, plugins), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
388
}
421
389
}
422
390
}
423
391
}
424
392
break;
425
case 'E': /* --env-for */
393
case 'f':
426
394
if(arg == NULL){
427
395
break;
428
396
}
431
399
if(envdef == NULL){
432
400
break;
433
401
}
434
*envdef = '\0';
435
if(not add_environment(getplugin(arg), envdef+1, true)){
402
char *p_name = strndup(arg, (size_t) (envdef-arg));
403
if(p_name == NULL){
404
break;
405
}
406
envdef++;
407
if(not add_environment(getplugin(p_name, plugins), envdef)){
436
408
perror("add_environment");
437
409
}
438
410
}
439
411
break;
440
case 'd': /* --disable */
441
if(arg != NULL){
442
plugin *p = getplugin(arg);
412
case 'd':
413
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
443
415
if(p == NULL){
444
416
return ARGP_ERR_UNKNOWN;
445
417
}
446
418
p->disabled = true;
447
419
}
448
420
break;
449
case 'e': /* --enable */
450
if(arg != NULL){
451
plugin *p = getplugin(arg);
452
if(p == NULL){
453
return ARGP_ERR_UNKNOWN;
454
}
455
p->disabled = false;
456
}
457
break;
458
case 128: /* --plugin-dir */
459
free(plugindir);
421
case 128:
460
422
plugindir = strdup(arg);
461
423
if(plugindir == NULL){
462
424
perror("strdup");
463
425
}
464
426
break;
465
case 129: /* --config-file */
466
/* This is already done by parse_opt_config_file() */
467
break;
468
case 130: /* --userid */
469
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
470
if(ret < 1 or tmpmax != (uid_t)tmpmax
471
or arg[numchars] != '\0'){
472
fprintf(stderr, "Bad user ID number: \"%s\", using %"
473
PRIdMAX "\n", arg, (intmax_t)uid);
474
} else {
475
uid = (uid_t)tmpmax;
476
}
477
break;
478
case 131: /* --groupid */
479
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
480
if(ret < 1 or tmpmax != (gid_t)tmpmax
481
or arg[numchars] != '\0'){
482
fprintf(stderr, "Bad group ID number: \"%s\", using %"
483
PRIdMAX "\n", arg, (intmax_t)gid);
484
} else {
485
gid = (gid_t)tmpmax;
486
}
487
break;
488
case 132: /* --debug */
489
debug = true;
490
break;
491
/*
492
* When adding more options before this line, remember to also add a
493
* "case" to the "parse_opt_config_file" function below.
494
*/
495
case ARGP_KEY_ARG:
496
/* Cryptsetup always passes an argument, which is an empty
497
string if "none" was specified in /etc/crypttab. So if
498
argument was empty, we ignore it silently. */
499
if(arg[0] != '\0'){
500
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
501
}
502
break;
503
case ARGP_KEY_END:
504
break;
505
default:
506
return ARGP_ERR_UNKNOWN;
507
}
508
return 0;
509
}
510
511
/* This option parser is the same as parse_opt() above, except it
512
ignores everything but the --config-file option. */
513
error_t parse_opt_config_file(int key, char *arg,
514
__attribute__((unused))
515
struct argp_state *state) {
516
switch(key) {
517
case 'g': /* --global-options */
518
case 'G': /* --global-env */
519
case 'o': /* --options-for */
520
case 'E': /* --env-for */
521
case 'd': /* --disable */
522
case 'e': /* --enable */
523
case 128: /* --plugin-dir */
524
break;
525
case 129: /* --config-file */
526
free(argfile);
427
case 129:
527
428
argfile = strdup(arg);
528
429
if(argfile == NULL){
529
430
perror("strdup");
530
431
}
531
432
break;
532
case 130: /* --userid */
533
case 131: /* --groupid */
534
case 132: /* --debug */
433
case 130:
434
uid = (uid_t)strtol(arg, NULL, 10);
435
break;
436
case 131:
437
gid = (gid_t)strtol(arg, NULL, 10);
438
break;
439
case 132:
440
debug = true;
441
break;
535
442
case ARGP_KEY_ARG:
443
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
444
break;
536
445
case ARGP_KEY_END:
537
446
break;
538
447
default:
541
450
return 0;
542
451
}
543
452
544
struct argp argp = { .options = options,
545
.parser = parse_opt_config_file,
546
.args_doc = "",
453
plugin *plugin_list = NULL;
454
455
struct argp argp = { .options = options, .parser = parse_opt,
456
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
547
457
.doc = "Mandos plugin runner -- Run plugins" };
548
458
549
/* Parse using parse_opt_config_file() in order to get the custom
550
config file location, if any. */
551
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
552
if(ret == ARGP_ERR_UNKNOWN){
459
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
460
if (ret == ARGP_ERR_UNKNOWN){
553
461
fprintf(stderr, "Unknown error while parsing arguments\n");
554
462
exitstatus = EXIT_FAILURE;
555
463
goto fallback;
556
464
}
557
558
/* Reset to the normal argument parser */
559
argp.parser = parse_opt;
560
561
/* Open the configfile if available */
562
if(argfile == NULL){
465
466
if (argfile == NULL){
563
467
conffp = fopen(AFILE, "r");
564
468
} else {
565
469
conffp = fopen(argfile, "r");
566
}
470
}
471
567
472
if(conffp != NULL){
568
473
char *org_line = NULL;
569
474
char *p, *arg, *new_arg, *line;
570
475
size_t size = 0;
476
ssize_t sret;
571
477
const char whitespace_delims[] = " \r\t\f\v\n";
572
478
const char comment_delim[] = "#";
573
479
580
486
}
581
487
custom_argv[0] = argv[0];
582
488
custom_argv[1] = NULL;
583
584
/* for each line in the config file, strip whitespace and ignore
585
commented text */
489
586
490
while(true){
587
491
sret = getline(&org_line, &size, conffp);
588
492
if(sret == -1){
617
521
}
618
522
}
619
523
free(org_line);
620
} else {
524
} else{
621
525
/* Check for harmful errors and go to fallback. Other errors might
622
526
not affect opening plugins */
623
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
527
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
624
528
perror("fopen");
625
529
exitstatus = EXIT_FAILURE;
626
530
goto fallback;
627
531
}
628
532
}
629
/* If there was any arguments from configuration file,
630
pass them to parser as command arguments */
533
631
534
if(custom_argv != NULL){
632
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
633
0, NULL);
634
if(ret == ARGP_ERR_UNKNOWN){
535
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
536
if (ret == ARGP_ERR_UNKNOWN){
635
537
fprintf(stderr, "Unknown error while parsing arguments\n");
636
538
exitstatus = EXIT_FAILURE;
637
539
goto fallback;
638
540
}
639
541
}
640
542
641
/* Parse actual command line arguments, to let them override the
642
config file */
643
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
644
if(ret == ARGP_ERR_UNKNOWN){
645
fprintf(stderr, "Unknown error while parsing arguments\n");
646
exitstatus = EXIT_FAILURE;
647
goto fallback;
648
}
649
650
543
if(debug){
651
544
for(plugin *p = plugin_list; p != NULL; p=p->next){
652
545
fprintf(stderr, "Plugin: %s has %d arguments\n",
654
547
for(char **a = p->argv; *a != NULL; a++){
655
548
fprintf(stderr, "\tArg: %s\n", *a);
656
549
}
657
fprintf(stderr, "...and %d environment variables\n", p->envc);
550
fprintf(stderr, "...and %u environment variables\n", p->envc);
658
551
for(char **a = p->environ; *a != NULL; a++){
659
552
fprintf(stderr, "\t%s\n", *a);
660
553
}
661
554
}
662
555
}
663
556
664
/* Strip permissions down to nobody */
665
557
ret = setuid(uid);
666
if(ret == -1){
558
if (ret == -1){
667
559
perror("setuid");
668
}
560
}
561
669
562
setgid(gid);
670
if(ret == -1){
563
if (ret == -1){
671
564
perror("setgid");
672
565
}
673
674
if(plugindir == NULL){
566
567
if (plugindir == NULL){
675
568
dir = opendir(PDIR);
676
569
} else {
677
570
dir = opendir(plugindir);
698
591
699
592
FD_ZERO(&rfds_all);
700
593
701
/* Read and execute any executable in the plugin directory*/
702
594
while(true){
703
595
dirst = readdir(dir);
704
596
705
/* All directory entries have been processed */
597
// All directory entries have been processed
706
598
if(dirst == NULL){
707
if(errno == EBADF){
599
if (errno == EBADF){
708
600
perror("readdir");
709
601
exitstatus = EXIT_FAILURE;
710
602
goto fallback;
714
606
715
607
d_name_len = strlen(dirst->d_name);
716
608
717
/* Ignore dotfiles, backup files and other junk */
609
// Ignore dotfiles, backup files and other junk
718
610
{
719
611
bool bad_name = false;
720
612
722
614
723
615
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
724
616
".dpkg-old",
725
".dpkg-bak",
726
617
".dpkg-divert", NULL };
727
618
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
728
619
size_t pre_len = strlen(*pre);
736
627
break;
737
628
}
738
629
}
630
739
631
if(bad_name){
740
632
continue;
741
633
}
634
742
635
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
743
636
size_t suf_len = strlen(*suf);
744
637
if((d_name_len >= suf_len)
759
652
}
760
653
761
654
char *filename;
762
if(plugindir == NULL){
763
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
764
} else {
765
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
766
}
655
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
767
656
if(ret < 0){
768
657
perror("asprintf");
769
658
continue;
770
659
}
771
660
772
661
ret = stat(filename, &st);
773
if(ret == -1){
662
if (ret == -1){
774
663
perror("stat");
775
664
free(filename);
776
665
continue;
777
666
}
778
779
/* Ignore non-executable files */
780
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
667
668
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
781
669
if(debug){
782
670
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
783
671
" with bad type or mode\n", filename);
785
673
free(filename);
786
674
continue;
787
675
}
788
789
plugin *p = getplugin(dirst->d_name);
676
plugin *p = getplugin(dirst->d_name, &plugin_list);
790
677
if(p == NULL){
791
678
perror("getplugin");
792
679
free(filename);
802
689
}
803
690
{
804
691
/* Add global arguments to argument list for this plugin */
805
plugin *g = getplugin(NULL);
692
plugin *g = getplugin(NULL, &plugin_list);
806
693
if(g != NULL){
807
694
for(char **a = g->argv + 1; *a != NULL; a++){
808
695
if(not add_argument(p, *a)){
811
698
}
812
699
/* Add global environment variables */
813
700
for(char **e = g->environ; *e != NULL; e++){
814
if(not add_environment(p, *e, false)){
701
if(not add_environment(p, *e)){
815
702
perror("add_environment");
816
703
}
817
704
}
822
709
process, too. */
823
710
if(p->environ[0] != NULL){
824
711
for(char **e = environ; *e != NULL; e++){
825
if(not add_environment(p, *e, false)){
712
char *copy = strdup(*e);
713
if(copy == NULL){
714
perror("strdup");
715
continue;
716
}
717
if(not add_environment(p, copy)){
826
718
perror("add_environment");
827
719
}
828
720
}
830
722
831
723
int pipefd[2];
832
724
ret = pipe(pipefd);
833
if(ret == -1){
725
if (ret == -1){
834
726
perror("pipe");
835
727
exitstatus = EXIT_FAILURE;
836
728
goto fallback;
837
729
}
838
/* Ask OS to automatic close the pipe on exec */
839
730
ret = set_cloexec_flag(pipefd[0]);
840
731
if(ret < 0){
841
732
perror("set_cloexec_flag");
849
740
goto fallback;
850
741
}
851
742
/* Block SIGCHLD until process is safely in process list */
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
743
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
853
744
if(ret < 0){
854
745
perror("sigprocmask");
855
746
exitstatus = EXIT_FAILURE;
856
747
goto fallback;
857
748
}
858
/* Starting a new process to be watched */
749
// Starting a new process to be watched
859
750
pid_t pid = fork();
860
751
if(pid == -1){
861
752
perror("fork");
869
760
perror("sigaction");
870
761
_exit(EXIT_FAILURE);
871
762
}
872
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
763
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
873
764
if(ret < 0){
874
765
perror("sigprocmask");
875
766
_exit(EXIT_FAILURE);
876
767
}
877
768
878
769
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
879
770
if(ret == -1){
880
771
perror("dup2");
899
790
}
900
791
/* no return */
901
792
}
902
/* Parent process */
903
close(pipefd[1]); /* Close unused write end of pipe */
793
/* parent process */
904
794
free(filename);
905
plugin *new_plugin = getplugin(dirst->d_name);
906
if(new_plugin == NULL){
907
perror("getplugin");
908
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
795
close(pipefd[1]); /* close unused write end of pipe */
796
process *new_process = malloc(sizeof(process));
797
if (new_process == NULL){
798
perror("malloc");
799
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
909
800
if(ret < 0){
910
perror("sigprocmask");
801
perror("sigprocmask");
911
802
}
912
803
exitstatus = EXIT_FAILURE;
913
804
goto fallback;
914
805
}
915
806
916
new_plugin->pid = pid;
917
new_plugin->fd = pipefd[0];
918
807
*new_process = (struct process){ .pid = pid,
808
.fd = pipefd[0],
809
.next = process_list };
810
// List handling
811
process_list = new_process;
919
812
/* Unblock SIGCHLD so signal handler can be run if this process
920
813
has already completed */
921
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
814
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
922
815
if(ret < 0){
923
816
perror("sigprocmask");
924
817
exitstatus = EXIT_FAILURE;
925
818
goto fallback;
926
819
}
927
820
928
FD_SET(new_plugin->fd, &rfds_all);
821
FD_SET(new_process->fd, &rfds_all);
929
822
930
if(maxfd < new_plugin->fd){
931
maxfd = new_plugin->fd;
823
if (maxfd < new_process->fd){
824
maxfd = new_process->fd;
932
825
}
826
933
827
}
828
829
free_plugin_list(plugin_list);
830
plugin_list = NULL;
934
831
935
832
closedir(dir);
936
833
dir = NULL;
937
938
for(plugin *p = plugin_list; p != NULL; p = p->next){
939
if(p->pid != 0){
940
break;
941
}
942
if(p->next == NULL){
943
fprintf(stderr, "No plugin processes started. Incorrect plugin"
944
" directory?\n");
945
free_plugin_list();
946
}
834
835
if (process_list == NULL){
836
fprintf(stderr, "No plugin processes started. Incorrect plugin"
837
" directory?\n");
838
process_list = NULL;
947
839
}
948
949
/* Main loop while running plugins exist */
950
while(plugin_list){
840
while(process_list){
951
841
fd_set rfds = rfds_all;
952
842
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
953
if(select_ret == -1){
843
if (select_ret == -1){
954
844
perror("select");
955
845
exitstatus = EXIT_FAILURE;
956
846
goto fallback;
957
847
}
958
848
/* OK, now either a process completed, or something can be read
959
849
from one of them */
960
for(plugin *proc = plugin_list; proc != NULL;){
850
for(process *proc = process_list; proc ; proc = proc->next){
961
851
/* Is this process completely done? */
962
852
if(proc->eof and proc->completed){
963
853
/* Only accept the plugin output if it exited cleanly */
964
854
if(not WIFEXITED(proc->status)
965
855
or WEXITSTATUS(proc->status) != 0){
966
856
/* Bad exit by plugin */
967
968
857
if(debug){
969
858
if(WIFEXITED(proc->status)){
970
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
971
" %d\n", (intmax_t) (proc->pid),
859
fprintf(stderr, "Plugin %u exited with status %d\n",
860
(unsigned int) (proc->pid),
972
861
WEXITSTATUS(proc->status));
973
862
} else if(WIFSIGNALED(proc->status)) {
974
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
975
" %d\n", (intmax_t) (proc->pid),
863
fprintf(stderr, "Plugin %u killed by signal %d\n",
864
(unsigned int) (proc->pid),
976
865
WTERMSIG(proc->status));
977
866
} else if(WCOREDUMP(proc->status)){
978
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
979
(intmax_t) (proc->pid));
867
fprintf(stderr, "Plugin %d dumped core\n",
868
(unsigned int) (proc->pid));
980
869
}
981
870
}
982
983
871
/* Remove the plugin */
984
872
FD_CLR(proc->fd, &rfds_all);
985
986
873
/* Block signal while modifying process_list */
987
874
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
988
875
if(ret < 0){
990
877
exitstatus = EXIT_FAILURE;
991
878
goto fallback;
992
879
}
993
994
plugin *next_plugin = proc->next;
995
free_plugin(proc);
996
proc = next_plugin;
997
880
/* Delete this process entry from the list */
881
if(process_list == proc){
882
/* First one - simple */
883
process_list = proc->next;
884
} else {
885
/* Second one or later */
886
for(process *p = process_list; p != NULL; p = p->next){
887
if(p->next == proc){
888
p->next = proc->next;
889
break;
890
}
891
}
892
}
998
893
/* We are done modifying process list, so unblock signal */
999
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1000
NULL);
894
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
895
NULL);
1001
896
if(ret < 0){
1002
897
perror("sigprocmask");
1003
exitstatus = EXIT_FAILURE;
1004
goto fallback;
1005
}
1006
1007
if(plugin_list == NULL){
1008
break;
1009
}
1010
1011
continue;
898
}
899
free(proc->buffer);
900
free(proc);
901
/* We deleted this process from the list, so we can't go
902
proc->next. Therefore, start over from the beginning of
903
the process list */
904
break;
1012
905
}
1013
1014
906
/* This process exited nicely, so print its buffer */
1015
907
1016
908
bool bret = print_out_password(proc->buffer,
1017
909
proc->buffer_length);
1018
910
if(not bret){
1021
913
}
1022
914
goto fallback;
1023
915
}
1024
1025
916
/* This process has not completed. Does it have any output? */
1026
917
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1027
918
/* This process had nothing to say at this time */
1028
proc = proc->next;
1029
919
continue;
1030
920
}
1031
921
/* Before reading, make the process' data buffer large enough */
1032
922
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1033
923
proc->buffer = realloc(proc->buffer, proc->buffer_size
1034
924
+ (size_t) BUFFER_SIZE);
1035
if(proc->buffer == NULL){
925
if (proc->buffer == NULL){
1036
926
perror("malloc");
1037
927
exitstatus = EXIT_FAILURE;
1038
928
goto fallback;
1040
930
proc->buffer_size += BUFFER_SIZE;
1041
931
}
1042
932
/* Read from the process */
1043
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1044
BUFFER_SIZE);
1045
if(sret < 0){
933
ret = read(proc->fd, proc->buffer + proc->buffer_length,
934
BUFFER_SIZE);
935
if(ret < 0){
1046
936
/* Read error from this process; ignore the error */
1047
proc = proc->next;
1048
937
continue;
1049
938
}
1050
if(sret == 0){
939
if(ret == 0){
1051
940
/* got EOF */
1052
941
proc->eof = true;
1053
942
} else {
1054
proc->buffer_length += (size_t) sret;
943
proc->buffer_length += (size_t) ret;
1055
944
}
1056
945
}
1057
946
}
1059
948
1060
949
fallback:
1061
950
1062
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
951
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1063
952
/* Fallback if all plugins failed, none are found or an error
1064
953
occured */
1065
954
bool bret;
1066
955
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1067
956
char *passwordbuffer = getpass("Password: ");
1068
size_t len = strlen(passwordbuffer);
1069
/* Strip trailing newline */
1070
if(len > 0 and passwordbuffer[len-1] == '\n'){
1071
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1072
len--;
1073
}
1074
bret = print_out_password(passwordbuffer, len);
957
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1075
958
if(not bret){
1076
959
perror("print_out_password");
1077
960
exitstatus = EXIT_FAILURE;
1084
967
perror("sigaction");
1085
968
exitstatus = EXIT_FAILURE;
1086
969
}
1087
970
1088
971
if(custom_argv != NULL){
1089
972
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1090
973
free(*arg);
1091
974
}
1092
975
free(custom_argv);
1093
976
}
977
free_plugin_list(plugin_list);
1094
978
1095
979
if(dir != NULL){
1096
980
closedir(dir);
1097
981
}
1098
982
1099
/* Kill the processes */
1100
for(plugin *p = plugin_list; p != NULL; p = p->next){
1101
if(p->pid != 0){
1102
close(p->fd);
1103
ret = kill(p->pid, SIGTERM);
1104
if(ret == -1 and errno != ESRCH){
1105
/* Set-uid proccesses might not get closed */
1106
perror("kill");
1107
}
983
/* Free the process list and kill the processes */
984
for(process *next; process_list != NULL; process_list = next){
985
next = process_list->next;
986
close(process_list->fd);
987
ret = kill(process_list->pid, SIGTERM);
988
if(ret == -1 and errno != ESRCH){
989
/* set-uid proccesses migth not get closed */
990
perror("kill");
1108
991
}
992
free(process_list->buffer);
993
free(process_list);
1109
994
}
1110
995
1111
996
/* Wait for any remaining child processes to terminate */
1115
1000
if(errno != ECHILD){
1116
1001
perror("wait");
1117
1002
}
1118
1119
free_plugin_list();
1120
1003
1121
1004
free(plugindir);
1122
1005
free(argfile);
1123
1006
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0