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- Committer: Björn Påhlsson
- Date: 2008-08-24 23:13:57 UTC
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 102.
- Revision ID: belorn@braxen-20080824231357-e304pw7ls2dnnvw5
* plugin-runner.c (handle_sigchld): Loop until all exited children
have been wait()ed for.
have been wait()ed for.
- 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,
57
56
#include <argp.h> /* struct argp_option, struct
58
57
argp_state, struct argp,
59
58
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG,
61
error_t */
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
62
60
#include <signal.h> /* struct sigaction, sigemptyset(),
63
61
sigaddset(), sigaction(),
64
62
sigprocmask(), SIG_BLOCK, SIGCHLD,
66
64
#include <errno.h> /* errno, EBADF */
67
65
68
66
#define BUFFER_SIZE 256
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;
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
69
const char *argp_program_version = "plugin-runner 1.0";
74
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
75
71
72
struct process;
73
74
typedef struct process{
75
pid_t pid;
76
int fd;
77
char *buffer;
78
size_t buffer_size;
79
size_t buffer_length;
80
bool eof;
81
bool completed;
82
int status;
83
struct process *next;
84
} process;
85
76
86
typedef struct plugin{
77
87
char *name; /* can be NULL or any plugin name */
78
88
char **argv;
80
90
char **environ;
81
91
int envc;
82
92
bool disabled;
83
84
/* Variables used for running processes*/
85
pid_t pid;
86
int fd;
87
char *buffer;
88
size_t buffer_size;
89
size_t buffer_length;
90
bool eof;
91
volatile bool completed;
92
volatile int status;
93
93
struct plugin *next;
94
94
} plugin;
95
95
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){
96
static plugin *getplugin(char *name, plugin **plugin_list){
97
for (plugin *p = *plugin_list; p != NULL; p = p->next){
103
98
if ((p->name == name)
104
99
or (p->name and name and (strcmp(p->name, name) == 0))){
105
100
return p;
120
115
121
116
*new_plugin = (plugin) { .name = copy_name,
122
117
.argc = 1,
118
.envc = 0,
123
119
.disabled = false,
124
.next = plugin_list };
120
.next = *plugin_list };
125
121
126
122
new_plugin->argv = malloc(sizeof(char *) * 2);
127
123
if (new_plugin->argv == NULL){
131
127
}
132
128
new_plugin->argv[0] = copy_name;
133
129
new_plugin->argv[1] = NULL;
134
130
135
131
new_plugin->environ = malloc(sizeof(char *));
136
132
if(new_plugin->environ == NULL){
137
133
free(copy_name);
140
136
return NULL;
141
137
}
142
138
new_plugin->environ[0] = NULL;
143
144
139
/* Append the new plugin to the list */
145
plugin_list = new_plugin;
140
*plugin_list = new_plugin;
146
141
return new_plugin;
147
142
}
148
143
178
173
}
179
174
180
175
/* Add to a plugin's environment */
181
static bool add_environment(plugin *p, const char *def, bool replace){
176
static bool add_environment(plugin *p, const char *def){
182
177
if(p == NULL){
183
178
return false;
184
179
}
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
}
202
180
return add_to_char_array(def, &(p->environ), &(p->envc));
203
181
}
204
182
183
205
184
/*
206
185
* Based on the example in the GNU LibC manual chapter 13.13 "File
207
186
* Descriptor Flags".
208
187
* *Note File Descriptor Flags:(libc)Descriptor Flags.
209
188
*/
210
static int set_cloexec_flag(int fd){
189
static int set_cloexec_flag(int fd)
190
{
211
191
int ret = fcntl(fd, F_GETFD, 0);
212
192
/* If reading the flags failed, return error indication now. */
213
193
if(ret < 0){
217
197
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
218
198
}
219
199
200
process *process_list = NULL;
220
201
221
/* Mark processes as completed when they exit, and save their exit
202
/* Mark processes as completed when it exits, and save its exit
222
203
status. */
223
static void handle_sigchld(__attribute__((unused)) int sig){
204
void handle_sigchld(__attribute__((unused)) int sig){
205
process *proc = process_list;
224
206
while(true){
225
plugin *proc = plugin_list;
226
207
int status;
227
208
pid_t pid = waitpid(-1, &status, WNOHANG);
228
209
if(pid == 0){
229
/* Only still running child processes */
230
210
break;
231
211
}
232
212
if(pid == -1){
233
213
if (errno != ECHILD){
234
214
perror("waitpid");
235
215
}
236
/* No child processes */
237
break;
216
return;
238
217
}
239
240
/* A child exited, find it in process_list */
218
241
219
while(proc != NULL and proc->pid != pid){
242
220
proc = proc->next;
243
221
}
250
228
}
251
229
}
252
230
253
/* Prints out a password to stdout */
254
static bool print_out_password(const char *buffer, size_t length){
231
bool print_out_password(const char *buffer, size_t length){
255
232
ssize_t ret;
233
if(length>0 and buffer[length-1] == '\n'){
234
length--;
235
}
256
236
for(size_t written = 0; written < length; written += (size_t)ret){
257
237
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
258
238
length - written));
263
243
return true;
264
244
}
265
245
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
}
246
char **add_to_argv(char **argv, int *argc, char *arg){
247
if (argv == NULL){
248
*argc = 1;
249
argv = malloc(sizeof(char*) * 2);
250
if(argv == NULL){
251
return NULL;
290
252
}
291
}
292
293
free(plugin_node);
253
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
254
argv[1] = NULL;
255
}
256
*argc += 1;
257
argv = realloc(argv, sizeof(char *)
258
* ((unsigned int) *argc + 1));
259
if(argv == NULL){
260
return NULL;
261
}
262
argv[*argc-1] = arg;
263
argv[*argc] = NULL;
264
return argv;
294
265
}
295
266
296
static void free_plugin_list(void){
297
while(plugin_list != NULL){
298
free_plugin(plugin_list);
267
static void free_plugin_list(plugin *plugin_list){
268
for(plugin *next; plugin_list != NULL; plugin_list = next){
269
next = plugin_list->next;
270
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
271
free(*arg);
272
}
273
free(plugin_list->argv);
274
for(char **env = plugin_list->environ; *env != NULL; env++){
275
free(*env);
276
}
277
free(plugin_list->environ);
278
free(plugin_list);
299
279
}
300
280
}
301
281
302
282
int main(int argc, char *argv[]){
303
char *plugindir = NULL;
304
char *argfile = NULL;
283
const char *plugindir = "/lib/mandos/plugins.d";
284
const char *argfile = ARGFILE;
305
285
FILE *conffp;
306
286
size_t d_name_len;
307
287
DIR *dir = NULL;
339
319
{ .name = "global-options", .key = 'g',
340
320
.arg = "OPTION[,OPTION[,...]]",
341
321
.doc = "Options passed to all plugins" },
342
{ .name = "global-env", .key = 'G',
322
{ .name = "global-envs", .key = 'e',
343
323
.arg = "VAR=value",
344
324
.doc = "Environment variable passed to all plugins" },
345
325
{ .name = "options-for", .key = 'o',
346
326
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
347
327
.doc = "Options passed only to specified plugin" },
348
{ .name = "env-for", .key = 'E',
328
{ .name = "envs-for", .key = 'f',
349
329
.arg = "PLUGIN:ENV=value",
350
330
.doc = "Environment variable passed to specified plugin" },
351
331
{ .name = "disable", .key = 'd',
352
332
.arg = "PLUGIN",
353
333
.doc = "Disable a specific plugin", .group = 1 },
354
{ .name = "enable", .key = 'e',
355
.arg = "PLUGIN",
356
.doc = "Enable a specific plugin", .group = 1 },
357
334
{ .name = "plugin-dir", .key = 128,
358
335
.arg = "DIRECTORY",
359
336
.doc = "Specify a different plugin directory", .group = 2 },
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 },
337
{ .name = "userid", .key = 129,
338
.arg = "ID", .flags = 0,
339
.doc = "User ID the plugins will run as", .group = 2 },
340
{ .name = "groupid", .key = 130,
341
.arg = "ID", .flags = 0,
342
.doc = "Group ID the plugins will run as", .group = 2 },
343
{ .name = "debug", .key = 131,
344
.doc = "Debug mode", .group = 3 },
371
345
{ .name = NULL }
372
346
};
373
347
374
error_t parse_opt (int key, char *arg, __attribute__((unused))
375
struct argp_state *state) {
348
error_t parse_opt (int key, char *arg, struct argp_state *state) {
349
/* Get the INPUT argument from `argp_parse', which we know is a
350
pointer to our plugin list pointer. */
351
plugin **plugins = state->input;
376
352
switch (key) {
377
case 'g': /* --global-options */
353
case 'g':
378
354
if (arg != NULL){
379
355
char *p;
380
356
while((p = strsep(&arg, ",")) != NULL){
381
357
if(p[0] == '\0'){
382
358
continue;
383
359
}
384
if(not add_argument(getplugin(NULL), p)){
360
if(not add_argument(getplugin(NULL, plugins), p)){
385
361
perror("add_argument");
386
362
return ARGP_ERR_UNKNOWN;
387
363
}
388
364
}
389
365
}
390
366
break;
391
case 'G': /* --global-env */
367
case 'e':
392
368
if(arg == NULL){
393
369
break;
394
370
}
395
if(not add_environment(getplugin(NULL), arg, true)){
396
perror("add_environment");
371
{
372
char *envdef = strdup(arg);
373
if(envdef == NULL){
374
break;
375
}
376
if(not add_environment(getplugin(NULL, plugins), envdef)){
377
perror("add_environment");
378
}
397
379
}
398
380
break;
399
case 'o': /* --options-for */
381
case 'o':
400
382
if (arg != NULL){
401
383
char *p_name = strsep(&arg, ":");
402
if(p_name[0] == '\0' or arg == NULL){
384
if(p_name[0] == '\0'){
403
385
break;
404
386
}
405
387
char *opt = strsep(&arg, ":");
406
if(opt[0] == '\0' or opt == NULL){
388
if(opt[0] == '\0'){
407
389
break;
408
390
}
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;
391
if(opt != NULL){
392
char *p;
393
while((p = strsep(&opt, ",")) != NULL){
394
if(p[0] == '\0'){
395
continue;
396
}
397
if(not add_argument(getplugin(p_name, plugins), p)){
398
perror("add_argument");
399
return ARGP_ERR_UNKNOWN;
400
}
417
401
}
418
402
}
419
403
}
420
404
break;
421
case 'E': /* --env-for */
405
case 'f':
422
406
if(arg == NULL){
423
407
break;
424
408
}
427
411
if(envdef == NULL){
428
412
break;
429
413
}
430
*envdef = '\0';
431
if(not add_environment(getplugin(arg), envdef+1, true)){
414
char *p_name = strndup(arg, (size_t) (envdef-arg));
415
if(p_name == NULL){
416
break;
417
}
418
envdef++;
419
if(not add_environment(getplugin(p_name, plugins), envdef)){
432
420
perror("add_environment");
433
421
}
434
422
}
435
423
break;
436
case 'd': /* --disable */
424
case 'd':
437
425
if (arg != NULL){
438
plugin *p = getplugin(arg);
426
plugin *p = getplugin(arg, plugins);
439
427
if(p == NULL){
440
428
return ARGP_ERR_UNKNOWN;
441
429
}
442
430
p->disabled = true;
443
431
}
444
432
break;
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 */
433
case 128:
434
plugindir = arg;
435
break;
436
case 129:
465
437
uid = (uid_t)strtol(arg, NULL, 10);
466
438
break;
467
case 131: /* --groupid */
439
case 130:
468
440
gid = (gid_t)strtol(arg, NULL, 10);
469
441
break;
470
case 132: /* --debug */
442
case 131:
471
443
debug = true;
472
444
break;
473
445
case ARGP_KEY_ARG:
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 = "",
446
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
447
break;
448
case ARGP_KEY_END:
449
break;
450
default:
451
return ARGP_ERR_UNKNOWN;
452
}
453
return 0;
454
}
455
456
plugin *plugin_list = NULL;
457
458
struct argp argp = { .options = options, .parser = parse_opt,
459
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
525
460
.doc = "Mandos plugin runner -- Run plugins" };
526
461
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);
462
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
530
463
if (ret == ARGP_ERR_UNKNOWN){
531
464
fprintf(stderr, "Unknown error while parsing arguments\n");
532
465
exitstatus = EXIT_FAILURE;
533
466
goto fallback;
534
467
}
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
}
468
469
conffp = fopen(argfile, "r");
545
470
if(conffp != NULL){
546
471
char *org_line = NULL;
547
472
char *p, *arg, *new_arg, *line;
550
475
const char whitespace_delims[] = " \r\t\f\v\n";
551
476
const char comment_delim[] = "#";
552
477
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 */
565
478
while(true){
566
479
sret = getline(&org_line, &size, conffp);
567
480
if(sret == -1){
575
488
continue;
576
489
}
577
490
new_arg = strdup(p);
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;
491
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
492
if (custom_argv == NULL){
493
perror("add_to_argv");
494
exitstatus = EXIT_FAILURE;
495
goto fallback;
496
}
596
497
}
597
498
}
598
499
free(org_line);
599
} else {
500
} else{
600
501
/* Check for harmful errors and go to fallback. Other errors might
601
502
not affect opening plugins */
602
503
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
605
506
goto fallback;
606
507
}
607
508
}
608
/* If there was any arguments from configuration file,
609
pass them to parser as command arguments */
509
610
510
if(custom_argv != NULL){
611
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
612
0, NULL);
511
custom_argv[0] = argv[0];
512
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
613
513
if (ret == ARGP_ERR_UNKNOWN){
614
514
fprintf(stderr, "Unknown error while parsing arguments\n");
615
515
exitstatus = EXIT_FAILURE;
617
517
}
618
518
}
619
519
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
629
520
if(debug){
630
521
for(plugin *p = plugin_list; p != NULL; p=p->next){
631
522
fprintf(stderr, "Plugin: %s has %d arguments\n",
640
531
}
641
532
}
642
533
643
/* Strip permissions down to nobody */
644
534
ret = setuid(uid);
645
535
if (ret == -1){
646
536
perror("setuid");
647
}
537
}
538
648
539
setgid(gid);
649
540
if (ret == -1){
650
541
perror("setgid");
651
542
}
652
543
653
if (plugindir == NULL){
654
dir = opendir(PDIR);
655
} else {
656
dir = opendir(plugindir);
657
}
658
544
dir = opendir(plugindir);
659
545
if(dir == NULL){
660
546
perror("Could not open plugin dir");
661
547
exitstatus = EXIT_FAILURE;
677
563
678
564
FD_ZERO(&rfds_all);
679
565
680
/* Read and execute any executable in the plugin directory*/
681
566
while(true){
682
567
dirst = readdir(dir);
683
568
684
/* All directory entries have been processed */
569
// All directory entries have been processed
685
570
if(dirst == NULL){
686
571
if (errno == EBADF){
687
572
perror("readdir");
693
578
694
579
d_name_len = strlen(dirst->d_name);
695
580
696
/* Ignore dotfiles, backup files and other junk */
581
// Ignore dotfiles, backup files and other junk
697
582
{
698
583
bool bad_name = false;
699
584
701
586
702
587
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
703
588
".dpkg-old",
704
".dpkg-bak",
705
589
".dpkg-divert", NULL };
706
590
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
707
591
size_t pre_len = strlen(*pre);
715
599
break;
716
600
}
717
601
}
602
718
603
if(bad_name){
719
604
continue;
720
605
}
606
721
607
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
722
608
size_t suf_len = strlen(*suf);
723
609
if((d_name_len >= suf_len)
738
624
}
739
625
740
626
char *filename;
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
}
627
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
746
628
if(ret < 0){
747
629
perror("asprintf");
748
630
continue;
754
636
free(filename);
755
637
continue;
756
638
}
757
758
/* Ignore non-executable files */
639
759
640
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
760
641
if(debug){
761
642
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
764
645
free(filename);
765
646
continue;
766
647
}
767
768
plugin *p = getplugin(dirst->d_name);
648
plugin *p = getplugin(dirst->d_name, &plugin_list);
769
649
if(p == NULL){
770
650
perror("getplugin");
771
651
free(filename);
781
661
}
782
662
{
783
663
/* Add global arguments to argument list for this plugin */
784
plugin *g = getplugin(NULL);
664
plugin *g = getplugin(NULL, &plugin_list);
785
665
if(g != NULL){
786
666
for(char **a = g->argv + 1; *a != NULL; a++){
787
667
if(not add_argument(p, *a)){
790
670
}
791
671
/* Add global environment variables */
792
672
for(char **e = g->environ; *e != NULL; e++){
793
if(not add_environment(p, *e, false)){
673
if(not add_environment(p, *e)){
794
674
perror("add_environment");
795
675
}
796
676
}
801
681
process, too. */
802
682
if(p->environ[0] != NULL){
803
683
for(char **e = environ; *e != NULL; e++){
804
if(not add_environment(p, *e, false)){
684
char *copy = strdup(*e);
685
if(copy == NULL){
686
perror("strdup");
687
continue;
688
}
689
if(not add_environment(p, copy)){
805
690
perror("add_environment");
806
691
}
807
692
}
814
699
exitstatus = EXIT_FAILURE;
815
700
goto fallback;
816
701
}
817
/* Ask OS to automatic close the pipe on exec */
818
702
ret = set_cloexec_flag(pipefd[0]);
819
703
if(ret < 0){
820
704
perror("set_cloexec_flag");
834
718
exitstatus = EXIT_FAILURE;
835
719
goto fallback;
836
720
}
837
/* Starting a new process to be watched */
721
// Starting a new process to be watched
838
722
pid_t pid = fork();
839
723
if(pid == -1){
840
724
perror("fork");
848
732
perror("sigaction");
849
733
_exit(EXIT_FAILURE);
850
734
}
851
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
735
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
852
736
if(ret < 0){
853
737
perror("sigprocmask");
854
738
_exit(EXIT_FAILURE);
855
739
}
856
740
857
741
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
858
742
if(ret == -1){
859
743
perror("dup2");
878
762
}
879
763
/* no return */
880
764
}
881
/* Parent process */
882
close(pipefd[1]); /* Close unused write end of pipe */
765
/* parent process */
883
766
free(filename);
884
plugin *new_plugin = getplugin(dirst->d_name);
885
if (new_plugin == NULL){
886
perror("getplugin");
767
close(pipefd[1]); /* close unused write end of pipe */
768
process *new_process = malloc(sizeof(process));
769
if (new_process == NULL){
770
perror("malloc");
887
771
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
888
772
if(ret < 0){
889
perror("sigprocmask");
773
perror("sigprocmask");
890
774
}
891
775
exitstatus = EXIT_FAILURE;
892
776
goto fallback;
893
777
}
894
778
895
new_plugin->pid = pid;
896
new_plugin->fd = pipefd[0];
897
779
*new_process = (struct process){ .pid = pid,
780
.fd = pipefd[0],
781
.next = process_list };
782
// List handling
783
process_list = new_process;
898
784
/* Unblock SIGCHLD so signal handler can be run if this process
899
785
has already completed */
900
786
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
904
790
goto fallback;
905
791
}
906
792
907
FD_SET(new_plugin->fd, &rfds_all);
793
FD_SET(new_process->fd, &rfds_all);
908
794
909
if (maxfd < new_plugin->fd){
910
maxfd = new_plugin->fd;
795
if (maxfd < new_process->fd){
796
maxfd = new_process->fd;
911
797
}
798
912
799
}
913
800
801
free_plugin_list(plugin_list);
802
plugin_list = NULL;
803
914
804
closedir(dir);
915
805
dir = 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
}
806
807
if (process_list == NULL){
808
fprintf(stderr, "No plugin processes started. Incorrect plugin"
809
" directory?\n");
810
process_list = NULL;
926
811
}
927
928
/* Main loop while running plugins exist */
929
while(plugin_list){
812
while(process_list){
930
813
fd_set rfds = rfds_all;
931
814
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
932
815
if (select_ret == -1){
936
819
}
937
820
/* OK, now either a process completed, or something can be read
938
821
from one of them */
939
for(plugin *proc = plugin_list; proc != NULL;){
822
for(process *proc = process_list; proc ; proc = proc->next){
940
823
/* Is this process completely done? */
941
824
if(proc->eof and proc->completed){
942
825
/* Only accept the plugin output if it exited cleanly */
943
826
if(not WIFEXITED(proc->status)
944
827
or WEXITSTATUS(proc->status) != 0){
945
828
/* Bad exit by plugin */
946
947
829
if(debug){
948
830
if(WIFEXITED(proc->status)){
949
831
fprintf(stderr, "Plugin %u exited with status %d\n",
958
840
(unsigned int) (proc->pid));
959
841
}
960
842
}
961
962
843
/* Remove the plugin */
963
844
FD_CLR(proc->fd, &rfds_all);
964
965
845
/* Block signal while modifying process_list */
966
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
846
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
967
847
if(ret < 0){
968
848
perror("sigprocmask");
969
849
exitstatus = EXIT_FAILURE;
970
850
goto fallback;
971
851
}
972
973
plugin *next_plugin = proc->next;
974
free_plugin(proc);
975
proc = next_plugin;
976
852
/* Delete this process entry from the list */
853
if(process_list == proc){
854
/* First one - simple */
855
process_list = proc->next;
856
} else {
857
/* Second one or later */
858
for(process *p = process_list; p != NULL; p = p->next){
859
if(p->next == proc){
860
p->next = proc->next;
861
break;
862
}
863
}
864
}
977
865
/* We are done modifying process list, so unblock signal */
978
866
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
979
867
NULL);
980
868
if(ret < 0){
981
869
perror("sigprocmask");
982
exitstatus = EXIT_FAILURE;
983
goto fallback;
984
}
985
986
if(plugin_list == NULL){
987
break;
988
}
989
990
continue;
870
}
871
free(proc->buffer);
872
free(proc);
873
/* We deleted this process from the list, so we can't go
874
proc->next. Therefore, start over from the beginning of
875
the process list */
876
break;
991
877
}
992
993
878
/* This process exited nicely, so print its buffer */
994
995
bool bret = print_out_password(proc->buffer,
996
proc->buffer_length);
879
880
bool bret = print_out_password(proc->buffer, proc->buffer_length);
997
881
if(not bret){
998
882
perror("print_out_password");
999
883
exitstatus = EXIT_FAILURE;
1000
884
}
1001
885
goto fallback;
1002
886
}
1003
1004
887
/* This process has not completed. Does it have any output? */
1005
888
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1006
889
/* This process had nothing to say at this time */
1007
proc = proc->next;
1008
890
continue;
1009
891
}
1010
892
/* Before reading, make the process' data buffer large enough */
1023
905
BUFFER_SIZE);
1024
906
if(ret < 0){
1025
907
/* Read error from this process; ignore the error */
1026
proc = proc->next;
1027
908
continue;
1028
909
}
1029
910
if(ret == 0){
1038
919
1039
920
fallback:
1040
921
1041
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1042
/* Fallback if all plugins failed, none are found or an error
1043
occured */
922
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
923
/* Fallback if all plugins failed, none are found or an error occured */
1044
924
bool bret;
1045
925
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1046
926
char *passwordbuffer = getpass("Password: ");
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);
927
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1054
928
if(not bret){
1055
929
perror("print_out_password");
1056
930
exitstatus = EXIT_FAILURE;
1063
937
perror("sigaction");
1064
938
exitstatus = EXIT_FAILURE;
1065
939
}
1066
940
1067
941
if(custom_argv != NULL){
1068
for(char **arg = custom_argv+1; *arg != NULL; arg++){
942
for(char **arg = custom_argv; *arg != NULL; arg++){
1069
943
free(*arg);
1070
944
}
1071
945
free(custom_argv);
1072
946
}
947
free_plugin_list(plugin_list);
1073
948
1074
949
if(dir != NULL){
1075
950
closedir(dir);
1076
951
}
1077
952
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
}
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");
1087
961
}
962
free(process_list->buffer);
963
free(process_list);
1088
964
}
1089
965
1090
966
/* Wait for any remaining child processes to terminate */
1095
971
perror("wait");
1096
972
}
1097
973
1098
free_plugin_list();
1099
1100
free(plugindir);
1101
free(argfile);
1102
1103
974
return exitstatus;
1104
975
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0