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- Committer: Teddy Hogeborn
- Date: 2008-08-30 11:39:54 UTC
- Revision ID: teddy@fukt.bsnet.se-20080830113954-sbvgeq7z0wkdvz17
* mandos-keygen.xml (ENVIRONMENT): Replaced <varname> with <envar>.
* mandos.xml (ENVIRONMENT): - '' -
* mandos.xml (ENVIRONMENT): - '' -
- 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:
- .bzrignore
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;
121
118
122
119
*new_plugin = (plugin) { .name = copy_name,
123
120
.argc = 1,
121
.envc = 0,
124
122
.disabled = false,
125
.next = plugin_list };
123
.next = *plugin_list };
126
124
127
125
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if(new_plugin->argv == NULL){
126
if (new_plugin->argv == NULL){
129
127
free(copy_name);
130
128
free(new_plugin);
131
129
return NULL;
132
130
}
133
131
new_plugin->argv[0] = copy_name;
134
132
new_plugin->argv[1] = NULL;
135
133
136
134
new_plugin->environ = malloc(sizeof(char *));
137
135
if(new_plugin->environ == NULL){
138
136
free(copy_name);
141
139
return NULL;
142
140
}
143
141
new_plugin->environ[0] = NULL;
144
145
142
/* Append the new plugin to the list */
146
plugin_list = new_plugin;
143
*plugin_list = new_plugin;
147
144
return new_plugin;
148
145
}
149
146
179
176
}
180
177
181
178
/* Add to a plugin's environment */
182
static bool add_environment(plugin *p, const char *def, bool replace){
179
static bool add_environment(plugin *p, const char *def){
183
180
if(p == NULL){
184
181
return false;
185
182
}
186
/* namelen = length of name of environment variable */
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen + 1) == 0){
191
/* It already exists */
192
if(replace){
193
char *new = realloc(*e, strlen(def) + 1);
194
if(new == NULL){
195
return false;
196
}
197
*e = new;
198
strcpy(*e, def);
199
}
200
return true;
201
}
202
}
203
183
return add_to_char_array(def, &(p->environ), &(p->envc));
204
184
}
205
185
186
206
187
/*
207
188
* Based on the example in the GNU LibC manual chapter 13.13 "File
208
189
* Descriptor Flags".
209
190
* *Note File Descriptor Flags:(libc)Descriptor Flags.
210
191
*/
211
static int set_cloexec_flag(int fd){
192
static int set_cloexec_flag(int fd)
193
{
212
194
int ret = fcntl(fd, F_GETFD, 0);
213
195
/* If reading the flags failed, return error indication now. */
214
196
if(ret < 0){
218
200
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
219
201
}
220
202
203
process *process_list = NULL;
221
204
222
205
/* Mark processes as completed when they exit, and save their exit
223
206
status. */
224
static void handle_sigchld(__attribute__((unused)) int sig){
207
void handle_sigchld(__attribute__((unused)) int sig){
225
208
while(true){
226
plugin *proc = plugin_list;
209
process *proc = process_list;
227
210
int status;
228
211
pid_t pid = waitpid(-1, &status, WNOHANG);
229
212
if(pid == 0){
231
214
break;
232
215
}
233
216
if(pid == -1){
234
if(errno != ECHILD){
217
if (errno != ECHILD){
235
218
perror("waitpid");
236
219
}
237
220
/* No child processes */
238
221
break;
239
222
}
240
223
241
224
/* A child exited, find it in process_list */
242
225
while(proc != NULL and proc->pid != pid){
243
226
proc = proc->next;
251
234
}
252
235
}
253
236
254
/* Prints out a password to stdout */
255
static bool print_out_password(const char *buffer, size_t length){
237
bool print_out_password(const char *buffer, size_t length){
256
238
ssize_t ret;
239
if(length>0 and buffer[length-1] == '\n'){
240
length--;
241
}
257
242
for(size_t written = 0; written < length; written += (size_t)ret){
258
243
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
259
244
length - written));
264
249
return true;
265
250
}
266
251
267
/* Removes and free a plugin from the plugin list */
268
static void free_plugin(plugin *plugin_node){
269
270
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
271
free(*arg);
272
}
273
free(plugin_node->argv);
274
for(char **env = plugin_node->environ; *env != NULL; env++){
275
free(*env);
276
}
277
free(plugin_node->environ);
278
free(plugin_node->buffer);
279
280
/* Removes the plugin from the singly-linked list */
281
if(plugin_node == plugin_list){
282
/* First one - simple */
283
plugin_list = plugin_list->next;
284
} else {
285
/* Second one or later */
286
for(plugin *p = plugin_list; p != NULL; p = p->next){
287
if(p->next == plugin_node){
288
p->next = plugin_node->next;
289
break;
290
}
291
}
292
}
293
294
free(plugin_node);
295
}
296
297
static void free_plugin_list(void){
298
while(plugin_list != NULL){
299
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);
300
264
}
301
265
}
302
266
309
273
struct dirent *dirst;
310
274
struct stat st;
311
275
fd_set rfds_all;
312
int ret, numchars, maxfd = 0;
313
ssize_t sret;
314
intmax_t tmpmax;
276
int ret, maxfd = 0;
315
277
uid_t uid = 65534;
316
278
gid_t gid = 65534;
317
279
bool debug = false;
342
304
{ .name = "global-options", .key = 'g',
343
305
.arg = "OPTION[,OPTION[,...]]",
344
306
.doc = "Options passed to all plugins" },
345
{ .name = "global-env", .key = 'G',
307
{ .name = "global-envs", .key = 'e',
346
308
.arg = "VAR=value",
347
309
.doc = "Environment variable passed to all plugins" },
348
310
{ .name = "options-for", .key = 'o',
349
311
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
350
312
.doc = "Options passed only to specified plugin" },
351
{ .name = "env-for", .key = 'E',
313
{ .name = "envs-for", .key = 'f',
352
314
.arg = "PLUGIN:ENV=value",
353
315
.doc = "Environment variable passed to specified plugin" },
354
316
{ .name = "disable", .key = 'd',
355
317
.arg = "PLUGIN",
356
318
.doc = "Disable a specific plugin", .group = 1 },
357
{ .name = "enable", .key = 'e',
358
.arg = "PLUGIN",
359
.doc = "Enable a specific plugin", .group = 1 },
360
319
{ .name = "plugin-dir", .key = 128,
361
320
.arg = "DIRECTORY",
362
321
.doc = "Specify a different plugin directory", .group = 2 },
374
333
{ .name = NULL }
375
334
};
376
335
377
error_t parse_opt(int key, char *arg, __attribute__((unused))
378
struct argp_state *state) {
379
switch(key) {
380
case 'g': /* --global-options */
381
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){
382
343
char *p;
383
344
while((p = strsep(&arg, ",")) != NULL){
384
345
if(p[0] == '\0'){
385
346
continue;
386
347
}
387
if(not add_argument(getplugin(NULL), p)){
348
if(not add_argument(getplugin(NULL, plugins), p)){
388
349
perror("add_argument");
389
350
return ARGP_ERR_UNKNOWN;
390
351
}
391
352
}
392
353
}
393
354
break;
394
case 'G': /* --global-env */
355
case 'e':
395
356
if(arg == NULL){
396
357
break;
397
358
}
398
if(not add_environment(getplugin(NULL), arg, true)){
399
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
}
400
367
}
401
368
break;
402
case 'o': /* --options-for */
403
if(arg != NULL){
369
case 'o':
370
if (arg != NULL){
404
371
char *p_name = strsep(&arg, ":");
405
if(p_name[0] == '\0' or arg == NULL){
372
if(p_name[0] == '\0'){
406
373
break;
407
374
}
408
375
char *opt = strsep(&arg, ":");
409
if(opt[0] == '\0' or opt == NULL){
376
if(opt[0] == '\0'){
410
377
break;
411
378
}
412
char *p;
413
while((p = strsep(&opt, ",")) != NULL){
414
if(p[0] == '\0'){
415
continue;
416
}
417
if(not add_argument(getplugin(p_name), p)){
418
perror("add_argument");
419
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
}
420
389
}
421
390
}
422
391
}
423
392
break;
424
case 'E': /* --env-for */
393
case 'f':
425
394
if(arg == NULL){
426
395
break;
427
396
}
430
399
if(envdef == NULL){
431
400
break;
432
401
}
433
*envdef = '\0';
434
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)){
435
408
perror("add_environment");
436
409
}
437
410
}
438
411
break;
439
case 'd': /* --disable */
440
if(arg != NULL){
441
plugin *p = getplugin(arg);
412
case 'd':
413
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
442
415
if(p == NULL){
443
416
return ARGP_ERR_UNKNOWN;
444
417
}
445
418
p->disabled = true;
446
419
}
447
420
break;
448
case 'e': /* --enable */
449
if(arg != NULL){
450
plugin *p = getplugin(arg);
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
453
}
454
p->disabled = false;
455
}
456
break;
457
case 128: /* --plugin-dir */
458
free(plugindir);
421
case 128:
459
422
plugindir = strdup(arg);
460
423
if(plugindir == NULL){
461
424
perror("strdup");
462
425
}
463
426
break;
464
case 129: /* --config-file */
465
/* This is already done by parse_opt_config_file() */
466
break;
467
case 130: /* --userid */
468
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
469
if(ret < 1 or tmpmax != (uid_t)tmpmax
470
or arg[numchars] != '\0'){
471
fprintf(stderr, "Bad user ID number: \"%s\", using %"
472
PRIdMAX "\n", arg, (intmax_t)uid);
473
} else {
474
uid = (uid_t)tmpmax;
475
}
476
break;
477
case 131: /* --groupid */
478
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
479
if(ret < 1 or tmpmax != (gid_t)tmpmax
480
or arg[numchars] != '\0'){
481
fprintf(stderr, "Bad group ID number: \"%s\", using %"
482
PRIdMAX "\n", arg, (intmax_t)gid);
483
} else {
484
gid = (gid_t)tmpmax;
485
}
486
break;
487
case 132: /* --debug */
488
debug = true;
489
break;
490
/*
491
* When adding more options before this line, remember to also add a
492
* "case" to the "parse_opt_config_file" function below.
493
*/
494
case ARGP_KEY_ARG:
495
/* Cryptsetup always passes an argument, which is an empty
496
string if "none" was specified in /etc/crypttab. So if
497
argument was empty, we ignore it silently. */
498
if(arg[0] != '\0'){
499
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
500
}
501
break;
502
case ARGP_KEY_END:
503
break;
504
default:
505
return ARGP_ERR_UNKNOWN;
506
}
507
return 0;
508
}
509
510
/* This option parser is the same as parse_opt() above, except it
511
ignores everything but the --config-file option. */
512
error_t parse_opt_config_file(int key, char *arg,
513
__attribute__((unused))
514
struct argp_state *state) {
515
switch(key) {
516
case 'g': /* --global-options */
517
case 'G': /* --global-env */
518
case 'o': /* --options-for */
519
case 'E': /* --env-for */
520
case 'd': /* --disable */
521
case 'e': /* --enable */
522
case 128: /* --plugin-dir */
523
break;
524
case 129: /* --config-file */
525
free(argfile);
427
case 129:
526
428
argfile = strdup(arg);
527
429
if(argfile == NULL){
528
430
perror("strdup");
529
431
}
530
432
break;
531
case 130: /* --userid */
532
case 131: /* --groupid */
533
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;
534
442
case ARGP_KEY_ARG:
443
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
444
break;
535
445
case ARGP_KEY_END:
536
446
break;
537
447
default:
540
450
return 0;
541
451
}
542
452
543
struct argp argp = { .options = options,
544
.parser = parse_opt_config_file,
545
.args_doc = "",
453
plugin *plugin_list = NULL;
454
455
struct argp argp = { .options = options, .parser = parse_opt,
456
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
546
457
.doc = "Mandos plugin runner -- Run plugins" };
547
458
548
/* Parse using parse_opt_config_file() in order to get the custom
549
config file location, if any. */
550
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
551
if(ret == ARGP_ERR_UNKNOWN){
459
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
460
if (ret == ARGP_ERR_UNKNOWN){
552
461
fprintf(stderr, "Unknown error while parsing arguments\n");
553
462
exitstatus = EXIT_FAILURE;
554
463
goto fallback;
555
464
}
556
557
/* Reset to the normal argument parser */
558
argp.parser = parse_opt;
559
560
/* Open the configfile if available */
561
if(argfile == NULL){
465
466
if (argfile == NULL){
562
467
conffp = fopen(AFILE, "r");
563
468
} else {
564
469
conffp = fopen(argfile, "r");
565
}
470
}
471
566
472
if(conffp != NULL){
567
473
char *org_line = NULL;
568
474
char *p, *arg, *new_arg, *line;
569
475
size_t size = 0;
476
ssize_t sret;
570
477
const char whitespace_delims[] = " \r\t\f\v\n";
571
478
const char comment_delim[] = "#";
572
479
579
486
}
580
487
custom_argv[0] = argv[0];
581
488
custom_argv[1] = NULL;
582
583
/* for each line in the config file, strip whitespace and ignore
584
commented text */
489
585
490
while(true){
586
491
sret = getline(&org_line, &size, conffp);
587
492
if(sret == -1){
616
521
}
617
522
}
618
523
free(org_line);
619
} else {
524
} else{
620
525
/* Check for harmful errors and go to fallback. Other errors might
621
526
not affect opening plugins */
622
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
527
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
623
528
perror("fopen");
624
529
exitstatus = EXIT_FAILURE;
625
530
goto fallback;
626
531
}
627
532
}
628
/* If there was any arguments from configuration file,
629
pass them to parser as command arguments */
533
630
534
if(custom_argv != NULL){
631
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
632
0, NULL);
633
if(ret == ARGP_ERR_UNKNOWN){
535
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
536
if (ret == ARGP_ERR_UNKNOWN){
634
537
fprintf(stderr, "Unknown error while parsing arguments\n");
635
538
exitstatus = EXIT_FAILURE;
636
539
goto fallback;
637
540
}
638
541
}
639
542
640
/* Parse actual command line arguments, to let them override the
641
config file */
642
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
643
if(ret == ARGP_ERR_UNKNOWN){
644
fprintf(stderr, "Unknown error while parsing arguments\n");
645
exitstatus = EXIT_FAILURE;
646
goto fallback;
647
}
648
649
543
if(debug){
650
544
for(plugin *p = plugin_list; p != NULL; p=p->next){
651
545
fprintf(stderr, "Plugin: %s has %d arguments\n",
653
547
for(char **a = p->argv; *a != NULL; a++){
654
548
fprintf(stderr, "\tArg: %s\n", *a);
655
549
}
656
fprintf(stderr, "...and %d environment variables\n", p->envc);
550
fprintf(stderr, "...and %u environment variables\n", p->envc);
657
551
for(char **a = p->environ; *a != NULL; a++){
658
552
fprintf(stderr, "\t%s\n", *a);
659
553
}
660
554
}
661
555
}
662
556
663
/* Strip permissions down to nobody */
664
557
ret = setuid(uid);
665
if(ret == -1){
558
if (ret == -1){
666
559
perror("setuid");
667
}
560
}
561
668
562
setgid(gid);
669
if(ret == -1){
563
if (ret == -1){
670
564
perror("setgid");
671
565
}
672
673
if(plugindir == NULL){
566
567
if (plugindir == NULL){
674
568
dir = opendir(PDIR);
675
569
} else {
676
570
dir = opendir(plugindir);
697
591
698
592
FD_ZERO(&rfds_all);
699
593
700
/* Read and execute any executable in the plugin directory*/
701
594
while(true){
702
595
dirst = readdir(dir);
703
596
704
/* All directory entries have been processed */
597
// All directory entries have been processed
705
598
if(dirst == NULL){
706
if(errno == EBADF){
599
if (errno == EBADF){
707
600
perror("readdir");
708
601
exitstatus = EXIT_FAILURE;
709
602
goto fallback;
713
606
714
607
d_name_len = strlen(dirst->d_name);
715
608
716
/* Ignore dotfiles, backup files and other junk */
609
// Ignore dotfiles, backup files and other junk
717
610
{
718
611
bool bad_name = false;
719
612
721
614
722
615
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
723
616
".dpkg-old",
724
".dpkg-bak",
725
617
".dpkg-divert", NULL };
726
618
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
727
619
size_t pre_len = strlen(*pre);
735
627
break;
736
628
}
737
629
}
630
738
631
if(bad_name){
739
632
continue;
740
633
}
634
741
635
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
742
636
size_t suf_len = strlen(*suf);
743
637
if((d_name_len >= suf_len)
758
652
}
759
653
760
654
char *filename;
761
if(plugindir == NULL){
762
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
763
} else {
764
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
765
}
655
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
766
656
if(ret < 0){
767
657
perror("asprintf");
768
658
continue;
769
659
}
770
660
771
661
ret = stat(filename, &st);
772
if(ret == -1){
662
if (ret == -1){
773
663
perror("stat");
774
664
free(filename);
775
665
continue;
776
666
}
777
778
/* Ignore non-executable files */
779
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)){
780
669
if(debug){
781
670
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
782
671
" with bad type or mode\n", filename);
784
673
free(filename);
785
674
continue;
786
675
}
787
788
plugin *p = getplugin(dirst->d_name);
676
plugin *p = getplugin(dirst->d_name, &plugin_list);
789
677
if(p == NULL){
790
678
perror("getplugin");
791
679
free(filename);
801
689
}
802
690
{
803
691
/* Add global arguments to argument list for this plugin */
804
plugin *g = getplugin(NULL);
692
plugin *g = getplugin(NULL, &plugin_list);
805
693
if(g != NULL){
806
694
for(char **a = g->argv + 1; *a != NULL; a++){
807
695
if(not add_argument(p, *a)){
810
698
}
811
699
/* Add global environment variables */
812
700
for(char **e = g->environ; *e != NULL; e++){
813
if(not add_environment(p, *e, false)){
701
if(not add_environment(p, *e)){
814
702
perror("add_environment");
815
703
}
816
704
}
821
709
process, too. */
822
710
if(p->environ[0] != NULL){
823
711
for(char **e = environ; *e != NULL; e++){
824
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)){
825
718
perror("add_environment");
826
719
}
827
720
}
829
722
830
723
int pipefd[2];
831
724
ret = pipe(pipefd);
832
if(ret == -1){
725
if (ret == -1){
833
726
perror("pipe");
834
727
exitstatus = EXIT_FAILURE;
835
728
goto fallback;
836
729
}
837
/* Ask OS to automatic close the pipe on exec */
838
730
ret = set_cloexec_flag(pipefd[0]);
839
731
if(ret < 0){
840
732
perror("set_cloexec_flag");
848
740
goto fallback;
849
741
}
850
742
/* Block SIGCHLD until process is safely in process list */
851
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
743
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
852
744
if(ret < 0){
853
745
perror("sigprocmask");
854
746
exitstatus = EXIT_FAILURE;
855
747
goto fallback;
856
748
}
857
/* Starting a new process to be watched */
749
// Starting a new process to be watched
858
750
pid_t pid = fork();
859
751
if(pid == -1){
860
752
perror("fork");
868
760
perror("sigaction");
869
761
_exit(EXIT_FAILURE);
870
762
}
871
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
763
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
872
764
if(ret < 0){
873
765
perror("sigprocmask");
874
766
_exit(EXIT_FAILURE);
875
767
}
876
768
877
769
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
878
770
if(ret == -1){
879
771
perror("dup2");
898
790
}
899
791
/* no return */
900
792
}
901
/* Parent process */
902
close(pipefd[1]); /* Close unused write end of pipe */
793
/* parent process */
903
794
free(filename);
904
plugin *new_plugin = getplugin(dirst->d_name);
905
if(new_plugin == NULL){
906
perror("getplugin");
907
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);
908
800
if(ret < 0){
909
perror("sigprocmask");
801
perror("sigprocmask");
910
802
}
911
803
exitstatus = EXIT_FAILURE;
912
804
goto fallback;
913
805
}
914
806
915
new_plugin->pid = pid;
916
new_plugin->fd = pipefd[0];
917
807
*new_process = (struct process){ .pid = pid,
808
.fd = pipefd[0],
809
.next = process_list };
810
// List handling
811
process_list = new_process;
918
812
/* Unblock SIGCHLD so signal handler can be run if this process
919
813
has already completed */
920
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
814
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
921
815
if(ret < 0){
922
816
perror("sigprocmask");
923
817
exitstatus = EXIT_FAILURE;
924
818
goto fallback;
925
819
}
926
820
927
FD_SET(new_plugin->fd, &rfds_all);
821
FD_SET(new_process->fd, &rfds_all);
928
822
929
if(maxfd < new_plugin->fd){
930
maxfd = new_plugin->fd;
823
if (maxfd < new_process->fd){
824
maxfd = new_process->fd;
931
825
}
826
932
827
}
828
829
free_plugin_list(plugin_list);
830
plugin_list = NULL;
933
831
934
832
closedir(dir);
935
833
dir = NULL;
936
937
for(plugin *p = plugin_list; p != NULL; p = p->next){
938
if(p->pid != 0){
939
break;
940
}
941
if(p->next == NULL){
942
fprintf(stderr, "No plugin processes started. Incorrect plugin"
943
" directory?\n");
944
free_plugin_list();
945
}
834
835
if (process_list == NULL){
836
fprintf(stderr, "No plugin processes started. Incorrect plugin"
837
" directory?\n");
838
process_list = NULL;
946
839
}
947
948
/* Main loop while running plugins exist */
949
while(plugin_list){
840
while(process_list){
950
841
fd_set rfds = rfds_all;
951
842
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
952
if(select_ret == -1){
843
if (select_ret == -1){
953
844
perror("select");
954
845
exitstatus = EXIT_FAILURE;
955
846
goto fallback;
956
847
}
957
848
/* OK, now either a process completed, or something can be read
958
849
from one of them */
959
for(plugin *proc = plugin_list; proc != NULL;){
850
for(process *proc = process_list; proc ; proc = proc->next){
960
851
/* Is this process completely done? */
961
852
if(proc->eof and proc->completed){
962
853
/* Only accept the plugin output if it exited cleanly */
963
854
if(not WIFEXITED(proc->status)
964
855
or WEXITSTATUS(proc->status) != 0){
965
856
/* Bad exit by plugin */
966
967
857
if(debug){
968
858
if(WIFEXITED(proc->status)){
969
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
970
" %d\n", (intmax_t) (proc->pid),
859
fprintf(stderr, "Plugin %u exited with status %d\n",
860
(unsigned int) (proc->pid),
971
861
WEXITSTATUS(proc->status));
972
862
} else if(WIFSIGNALED(proc->status)) {
973
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
974
" %d\n", (intmax_t) (proc->pid),
863
fprintf(stderr, "Plugin %u killed by signal %d\n",
864
(unsigned int) (proc->pid),
975
865
WTERMSIG(proc->status));
976
866
} else if(WCOREDUMP(proc->status)){
977
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
978
(intmax_t) (proc->pid));
867
fprintf(stderr, "Plugin %d dumped core\n",
868
(unsigned int) (proc->pid));
979
869
}
980
870
}
981
982
871
/* Remove the plugin */
983
872
FD_CLR(proc->fd, &rfds_all);
984
985
873
/* Block signal while modifying process_list */
986
874
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
987
875
if(ret < 0){
989
877
exitstatus = EXIT_FAILURE;
990
878
goto fallback;
991
879
}
992
993
plugin *next_plugin = proc->next;
994
free_plugin(proc);
995
proc = next_plugin;
996
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
}
997
893
/* We are done modifying process list, so unblock signal */
998
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
999
NULL);
894
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
895
NULL);
1000
896
if(ret < 0){
1001
897
perror("sigprocmask");
1002
exitstatus = EXIT_FAILURE;
1003
goto fallback;
1004
}
1005
1006
if(plugin_list == NULL){
1007
break;
1008
}
1009
1010
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;
1011
905
}
1012
1013
906
/* This process exited nicely, so print its buffer */
1014
907
1015
908
bool bret = print_out_password(proc->buffer,
1016
909
proc->buffer_length);
1017
910
if(not bret){
1020
913
}
1021
914
goto fallback;
1022
915
}
1023
1024
916
/* This process has not completed. Does it have any output? */
1025
917
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1026
918
/* This process had nothing to say at this time */
1027
proc = proc->next;
1028
919
continue;
1029
920
}
1030
921
/* Before reading, make the process' data buffer large enough */
1031
922
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1032
923
proc->buffer = realloc(proc->buffer, proc->buffer_size
1033
924
+ (size_t) BUFFER_SIZE);
1034
if(proc->buffer == NULL){
925
if (proc->buffer == NULL){
1035
926
perror("malloc");
1036
927
exitstatus = EXIT_FAILURE;
1037
928
goto fallback;
1039
930
proc->buffer_size += BUFFER_SIZE;
1040
931
}
1041
932
/* Read from the process */
1042
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1043
BUFFER_SIZE);
1044
if(sret < 0){
933
ret = read(proc->fd, proc->buffer + proc->buffer_length,
934
BUFFER_SIZE);
935
if(ret < 0){
1045
936
/* Read error from this process; ignore the error */
1046
proc = proc->next;
1047
937
continue;
1048
938
}
1049
if(sret == 0){
939
if(ret == 0){
1050
940
/* got EOF */
1051
941
proc->eof = true;
1052
942
} else {
1053
proc->buffer_length += (size_t) sret;
943
proc->buffer_length += (size_t) ret;
1054
944
}
1055
945
}
1056
946
}
1058
948
1059
949
fallback:
1060
950
1061
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
951
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1062
952
/* Fallback if all plugins failed, none are found or an error
1063
953
occured */
1064
954
bool bret;
1065
955
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1066
956
char *passwordbuffer = getpass("Password: ");
1067
size_t len = strlen(passwordbuffer);
1068
/* Strip trailing newline */
1069
if(len > 0 and passwordbuffer[len-1] == '\n'){
1070
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1071
len--;
1072
}
1073
bret = print_out_password(passwordbuffer, len);
957
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1074
958
if(not bret){
1075
959
perror("print_out_password");
1076
960
exitstatus = EXIT_FAILURE;
1083
967
perror("sigaction");
1084
968
exitstatus = EXIT_FAILURE;
1085
969
}
1086
970
1087
971
if(custom_argv != NULL){
1088
972
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1089
973
free(*arg);
1090
974
}
1091
975
free(custom_argv);
1092
976
}
977
free_plugin_list(plugin_list);
1093
978
1094
979
if(dir != NULL){
1095
980
closedir(dir);
1096
981
}
1097
982
1098
/* Kill the processes */
1099
for(plugin *p = plugin_list; p != NULL; p = p->next){
1100
if(p->pid != 0){
1101
close(p->fd);
1102
ret = kill(p->pid, SIGTERM);
1103
if(ret == -1 and errno != ESRCH){
1104
/* Set-uid proccesses might not get closed */
1105
perror("kill");
1106
}
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");
1107
991
}
992
free(process_list->buffer);
993
free(process_list);
1108
994
}
1109
995
1110
996
/* Wait for any remaining child processes to terminate */
1114
1000
if(errno != ECHILD){
1115
1001
perror("wait");
1116
1002
}
1117
1118
free_plugin_list();
1119
1003
1120
1004
free(plugindir);
1121
1005
free(argfile);
1122
1006
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0