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- Committer: Teddy Hogeborn
- Date: 2009-01-13 04:35:19 UTC
- Revision ID: teddy@fukt.bsnet.se-20090113043519-0yr39snphoegq8l1
* plugin-runner.c: Only space changes.
* plugins.d/mandos-client.c: - '' -
* plugins.d/password-prompt.c: - '' -
* plugins.d/mandos-client.c: - '' -
* plugins.d/password-prompt.c: - '' -
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- plugins.d/usplash
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- .bzrignore
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
6
7
*
7
8
* This program is free software: you can redistribute it and/or
8
9
* modify it under the terms of the GNU General Public License as
27
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
29
EXIT_SUCCESS, realloc() */
29
30
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
32
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
34
stat, waitpid(), WIFEXITED(),
34
35
WEXITSTATUS(), wait(), pid_t,
46
47
fcntl(), setuid(), setgid(),
47
48
F_GETFD, F_SETFD, FD_CLOEXEC,
48
49
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
dup2(), STDOUT_FILENO, _exit(),
50
51
execv(), write(), read(),
51
52
close() */
52
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
69
70
#define PDIR "/lib/mandos/plugins.d"
70
71
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
72
72
const char *argp_program_version = "plugin-runner 1.0";
73
const char *argp_program_version = "plugin-runner " VERSION;
73
74
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
75
75
struct process;
76
typedef struct plugin{
77
char *name; /* can be NULL or any plugin name */
78
char **argv;
79
int argc;
80
char **environ;
81
int envc;
82
bool disabled;
76
83
77
typedef struct process{
84
/* Variables used for running processes*/
78
85
pid_t pid;
79
86
int fd;
80
87
char *buffer;
83
90
bool eof;
84
91
volatile bool completed;
85
92
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;
96
93
struct plugin *next;
97
94
} plugin;
98
95
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))){
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){
103
if((p->name == name)
104
or (p->name and name and (strcmp(p->name, name) == 0))){
103
105
return p;
104
106
}
105
107
}
106
108
/* Create a new plugin */
107
109
plugin *new_plugin = malloc(sizeof(plugin));
108
if (new_plugin == NULL){
110
if(new_plugin == NULL){
109
111
return NULL;
110
112
}
111
113
char *copy_name = NULL;
118
120
119
121
*new_plugin = (plugin) { .name = copy_name,
120
122
.argc = 1,
121
.envc = 0,
122
123
.disabled = false,
123
.next = *plugin_list };
124
.next = plugin_list };
124
125
125
126
new_plugin->argv = malloc(sizeof(char *) * 2);
126
if (new_plugin->argv == NULL){
127
if(new_plugin->argv == NULL){
127
128
free(copy_name);
128
129
free(new_plugin);
129
130
return NULL;
130
131
}
131
132
new_plugin->argv[0] = copy_name;
132
133
new_plugin->argv[1] = NULL;
133
134
134
135
new_plugin->environ = malloc(sizeof(char *));
135
136
if(new_plugin->environ == NULL){
136
137
free(copy_name);
139
140
return NULL;
140
141
}
141
142
new_plugin->environ[0] = NULL;
143
142
144
/* Append the new plugin to the list */
143
*plugin_list = new_plugin;
145
plugin_list = new_plugin;
144
146
return new_plugin;
145
147
}
146
148
176
178
}
177
179
178
180
/* Add to a plugin's environment */
179
static bool add_environment(plugin *p, const char *def){
181
static bool add_environment(plugin *p, const char *def, bool replace){
180
182
if(p == NULL){
181
183
return false;
182
184
}
185
/* namelen = length of name of environment variable */
186
size_t namelen = (size_t)(strchrnul(def, '=') - def);
187
/* Search for this environment variable */
188
for(char **e = p->environ; *e != NULL; e++){
189
if(strncmp(*e, def, namelen + 1) == 0){
190
/* It already exists */
191
if(replace){
192
char *new = realloc(*e, strlen(def) + 1);
193
if(new == NULL){
194
return false;
195
}
196
*e = new;
197
strcpy(*e, def);
198
}
199
return true;
200
}
201
}
183
202
return add_to_char_array(def, &(p->environ), &(p->envc));
184
203
}
185
204
186
187
205
/*
188
206
* Based on the example in the GNU LibC manual chapter 13.13 "File
189
207
* Descriptor Flags".
190
208
* *Note File Descriptor Flags:(libc)Descriptor Flags.
191
209
*/
192
static int set_cloexec_flag(int fd)
193
{
210
static int set_cloexec_flag(int fd){
194
211
int ret = fcntl(fd, F_GETFD, 0);
195
212
/* If reading the flags failed, return error indication now. */
196
213
if(ret < 0){
200
217
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
201
218
}
202
219
203
process *process_list = NULL;
204
220
205
221
/* Mark processes as completed when they exit, and save their exit
206
222
status. */
207
void handle_sigchld(__attribute__((unused)) int sig){
223
static void handle_sigchld(__attribute__((unused)) int sig){
208
224
while(true){
209
process *proc = process_list;
225
plugin *proc = plugin_list;
210
226
int status;
211
227
pid_t pid = waitpid(-1, &status, WNOHANG);
212
228
if(pid == 0){
214
230
break;
215
231
}
216
232
if(pid == -1){
217
if (errno != ECHILD){
233
if(errno != ECHILD){
218
234
perror("waitpid");
219
235
}
220
236
/* No child processes */
221
237
break;
222
238
}
223
239
224
240
/* A child exited, find it in process_list */
225
241
while(proc != NULL and proc->pid != pid){
226
242
proc = proc->next;
234
250
}
235
251
}
236
252
237
bool print_out_password(const char *buffer, size_t length){
253
/* Prints out a password to stdout */
254
static bool print_out_password(const char *buffer, size_t length){
238
255
ssize_t ret;
239
if(length>0 and buffer[length-1] == '\n'){
240
length--;
241
}
242
256
for(size_t written = 0; written < length; written += (size_t)ret){
243
257
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
244
258
length - written));
249
263
return true;
250
264
}
251
265
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);
266
/* Removes and free a plugin from the plugin list */
267
static void free_plugin(plugin *plugin_node){
268
269
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
270
free(*arg);
271
}
272
free(plugin_node->argv);
273
for(char **env = plugin_node->environ; *env != NULL; env++){
274
free(*env);
275
}
276
free(plugin_node->environ);
277
free(plugin_node->buffer);
278
279
/* Removes the plugin from the singly-linked list */
280
if(plugin_node == plugin_list){
281
/* First one - simple */
282
plugin_list = plugin_list->next;
283
} else {
284
/* Second one or later */
285
for(plugin *p = plugin_list; p != NULL; p = p->next){
286
if(p->next == plugin_node){
287
p->next = plugin_node->next;
288
break;
289
}
290
}
291
}
292
293
free(plugin_node);
294
}
295
296
static void free_plugin_list(void){
297
while(plugin_list != NULL){
298
free_plugin(plugin_list);
264
299
}
265
300
}
266
301
274
309
struct stat st;
275
310
fd_set rfds_all;
276
311
int ret, maxfd = 0;
312
ssize_t sret;
277
313
uid_t uid = 65534;
278
314
gid_t gid = 65534;
279
315
bool debug = false;
304
340
{ .name = "global-options", .key = 'g',
305
341
.arg = "OPTION[,OPTION[,...]]",
306
342
.doc = "Options passed to all plugins" },
307
{ .name = "global-envs", .key = 'e',
343
{ .name = "global-env", .key = 'G',
308
344
.arg = "VAR=value",
309
345
.doc = "Environment variable passed to all plugins" },
310
346
{ .name = "options-for", .key = 'o',
311
347
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
312
348
.doc = "Options passed only to specified plugin" },
313
{ .name = "envs-for", .key = 'f',
349
{ .name = "env-for", .key = 'E',
314
350
.arg = "PLUGIN:ENV=value",
315
351
.doc = "Environment variable passed to specified plugin" },
316
352
{ .name = "disable", .key = 'd',
317
353
.arg = "PLUGIN",
318
354
.doc = "Disable a specific plugin", .group = 1 },
355
{ .name = "enable", .key = 'e',
356
.arg = "PLUGIN",
357
.doc = "Enable a specific plugin", .group = 1 },
319
358
{ .name = "plugin-dir", .key = 128,
320
359
.arg = "DIRECTORY",
321
360
.doc = "Specify a different plugin directory", .group = 2 },
333
372
{ .name = NULL }
334
373
};
335
374
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){
375
error_t parse_opt(int key, char *arg, __attribute__((unused))
376
struct argp_state *state) {
377
switch(key) {
378
case 'g': /* --global-options */
379
if(arg != NULL){
343
380
char *p;
344
381
while((p = strsep(&arg, ",")) != NULL){
345
382
if(p[0] == '\0'){
346
383
continue;
347
384
}
348
if(not add_argument(getplugin(NULL, plugins), p)){
385
if(not add_argument(getplugin(NULL), p)){
349
386
perror("add_argument");
350
387
return ARGP_ERR_UNKNOWN;
351
388
}
352
389
}
353
390
}
354
391
break;
355
case 'e':
392
case 'G': /* --global-env */
356
393
if(arg == NULL){
357
394
break;
358
395
}
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
}
396
if(not add_environment(getplugin(NULL), arg, true)){
397
perror("add_environment");
367
398
}
368
399
break;
369
case 'o':
370
if (arg != NULL){
400
case 'o': /* --options-for */
401
if(arg != NULL){
371
402
char *p_name = strsep(&arg, ":");
372
if(p_name[0] == '\0'){
403
if(p_name[0] == '\0' or arg == NULL){
373
404
break;
374
405
}
375
406
char *opt = strsep(&arg, ":");
376
if(opt[0] == '\0'){
407
if(opt[0] == '\0' or opt == NULL){
377
408
break;
378
409
}
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
}
410
char *p;
411
while((p = strsep(&opt, ",")) != NULL){
412
if(p[0] == '\0'){
413
continue;
414
}
415
if(not add_argument(getplugin(p_name), p)){
416
perror("add_argument");
417
return ARGP_ERR_UNKNOWN;
389
418
}
390
419
}
391
420
}
392
421
break;
393
case 'f':
422
case 'E': /* --env-for */
394
423
if(arg == NULL){
395
424
break;
396
425
}
399
428
if(envdef == NULL){
400
429
break;
401
430
}
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)){
431
*envdef = '\0';
432
if(not add_environment(getplugin(arg), envdef+1, true)){
408
433
perror("add_environment");
409
434
}
410
435
}
411
436
break;
412
case 'd':
413
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
437
case 'd': /* --disable */
438
if(arg != NULL){
439
plugin *p = getplugin(arg);
415
440
if(p == NULL){
416
441
return ARGP_ERR_UNKNOWN;
417
442
}
418
443
p->disabled = true;
419
444
}
420
445
break;
421
case 128:
446
case 'e': /* --enable */
447
if(arg != NULL){
448
plugin *p = getplugin(arg);
449
if(p == NULL){
450
return ARGP_ERR_UNKNOWN;
451
}
452
p->disabled = false;
453
}
454
break;
455
case 128: /* --plugin-dir */
456
free(plugindir);
422
457
plugindir = strdup(arg);
423
458
if(plugindir == NULL){
424
459
perror("strdup");
425
460
}
426
461
break;
427
case 129:
462
case 129: /* --config-file */
463
/* This is already done by parse_opt_config_file() */
464
break;
465
case 130: /* --userid */
466
/* In the GNU C library, uid_t is always unsigned int */
467
ret = sscanf(arg, "%u", &uid);
468
if(ret != 1){
469
fprintf(stderr, "Bad user ID number: \"%s\", using %u\n", arg,
470
uid);
471
}
472
break;
473
case 131: /* --groupid */
474
/* In the GNU C library, gid_t is always unsigned int */
475
ret = sscanf(arg, "%u", &gid);
476
if(ret != 1){
477
fprintf(stderr, "Bad group ID number: \"%s\", using %u\n",
478
arg, gid);
479
}
480
break;
481
case 132: /* --debug */
482
debug = true;
483
break;
484
/*
485
* When adding more options before this line, remember to also add a
486
* "case" to the "parse_opt_config_file" function below.
487
*/
488
case ARGP_KEY_ARG:
489
/* Cryptsetup always passes an argument, which is an empty
490
string if "none" was specified in /etc/crypttab. So if
491
argument was empty, we ignore it silently. */
492
if(arg[0] != '\0'){
493
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
494
}
495
break;
496
case ARGP_KEY_END:
497
break;
498
default:
499
return ARGP_ERR_UNKNOWN;
500
}
501
return 0;
502
}
503
504
/* This option parser is the same as parse_opt() above, except it
505
ignores everything but the --config-file option. */
506
error_t parse_opt_config_file(int key, char *arg,
507
__attribute__((unused))
508
struct argp_state *state) {
509
switch(key) {
510
case 'g': /* --global-options */
511
case 'G': /* --global-env */
512
case 'o': /* --options-for */
513
case 'E': /* --env-for */
514
case 'd': /* --disable */
515
case 'e': /* --enable */
516
case 128: /* --plugin-dir */
517
break;
518
case 129: /* --config-file */
519
free(argfile);
428
520
argfile = strdup(arg);
429
521
if(argfile == NULL){
430
522
perror("strdup");
431
523
}
432
524
break;
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;
525
case 130: /* --userid */
526
case 131: /* --groupid */
527
case 132: /* --debug */
442
528
case ARGP_KEY_ARG:
443
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
444
break;
445
529
case ARGP_KEY_END:
446
530
break;
447
531
default:
450
534
return 0;
451
535
}
452
536
453
plugin *plugin_list = NULL;
454
455
struct argp argp = { .options = options, .parser = parse_opt,
456
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
537
struct argp argp = { .options = options,
538
.parser = parse_opt_config_file,
539
.args_doc = "",
457
540
.doc = "Mandos plugin runner -- Run plugins" };
458
541
459
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
460
if (ret == ARGP_ERR_UNKNOWN){
542
/* Parse using parse_opt_config_file() in order to get the custom
543
config file location, if any. */
544
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
545
if(ret == ARGP_ERR_UNKNOWN){
461
546
fprintf(stderr, "Unknown error while parsing arguments\n");
462
547
exitstatus = EXIT_FAILURE;
463
548
goto fallback;
464
549
}
465
466
if (argfile == NULL){
550
551
/* Reset to the normal argument parser */
552
argp.parser = parse_opt;
553
554
/* Open the configfile if available */
555
if(argfile == NULL){
467
556
conffp = fopen(AFILE, "r");
468
557
} else {
469
558
conffp = fopen(argfile, "r");
470
}
471
559
}
472
560
if(conffp != NULL){
473
561
char *org_line = NULL;
474
562
char *p, *arg, *new_arg, *line;
475
563
size_t size = 0;
476
ssize_t sret;
477
564
const char whitespace_delims[] = " \r\t\f\v\n";
478
565
const char comment_delim[] = "#";
479
566
486
573
}
487
574
custom_argv[0] = argv[0];
488
575
custom_argv[1] = NULL;
489
576
577
/* for each line in the config file, strip whitespace and ignore
578
commented text */
490
579
while(true){
491
580
sret = getline(&org_line, &size, conffp);
492
581
if(sret == -1){
521
610
}
522
611
}
523
612
free(org_line);
524
} else{
613
} else {
525
614
/* Check for harmful errors and go to fallback. Other errors might
526
615
not affect opening plugins */
527
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
616
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
528
617
perror("fopen");
529
618
exitstatus = EXIT_FAILURE;
530
619
goto fallback;
531
620
}
532
621
}
533
622
/* If there was any arguments from configuration file,
623
pass them to parser as command arguments */
534
624
if(custom_argv != NULL){
535
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
536
if (ret == ARGP_ERR_UNKNOWN){
625
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
626
0, NULL);
627
if(ret == ARGP_ERR_UNKNOWN){
537
628
fprintf(stderr, "Unknown error while parsing arguments\n");
538
629
exitstatus = EXIT_FAILURE;
539
630
goto fallback;
540
631
}
541
632
}
542
633
634
/* Parse actual command line arguments, to let them override the
635
config file */
636
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
637
if(ret == ARGP_ERR_UNKNOWN){
638
fprintf(stderr, "Unknown error while parsing arguments\n");
639
exitstatus = EXIT_FAILURE;
640
goto fallback;
641
}
642
543
643
if(debug){
544
644
for(plugin *p = plugin_list; p != NULL; p=p->next){
545
645
fprintf(stderr, "Plugin: %s has %d arguments\n",
554
654
}
555
655
}
556
656
657
/* Strip permissions down to nobody */
557
658
ret = setuid(uid);
558
if (ret == -1){
659
if(ret == -1){
559
660
perror("setuid");
560
}
561
661
}
562
662
setgid(gid);
563
if (ret == -1){
663
if(ret == -1){
564
664
perror("setgid");
565
665
}
566
567
if (plugindir == NULL){
666
667
if(plugindir == NULL){
568
668
dir = opendir(PDIR);
569
669
} else {
570
670
dir = opendir(plugindir);
591
691
592
692
FD_ZERO(&rfds_all);
593
693
694
/* Read and execute any executable in the plugin directory*/
594
695
while(true){
595
696
dirst = readdir(dir);
596
697
597
// All directory entries have been processed
698
/* All directory entries have been processed */
598
699
if(dirst == NULL){
599
if (errno == EBADF){
700
if(errno == EBADF){
600
701
perror("readdir");
601
702
exitstatus = EXIT_FAILURE;
602
703
goto fallback;
606
707
607
708
d_name_len = strlen(dirst->d_name);
608
709
609
// Ignore dotfiles, backup files and other junk
710
/* Ignore dotfiles, backup files and other junk */
610
711
{
611
712
bool bad_name = false;
612
713
614
715
615
716
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
616
717
".dpkg-old",
718
".dpkg-bak",
617
719
".dpkg-divert", NULL };
618
720
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
619
721
size_t pre_len = strlen(*pre);
627
729
break;
628
730
}
629
731
}
630
631
732
if(bad_name){
632
733
continue;
633
734
}
634
635
735
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
636
736
size_t suf_len = strlen(*suf);
637
737
if((d_name_len >= suf_len)
652
752
}
653
753
654
754
char *filename;
655
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
755
if(plugindir == NULL){
756
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
757
} else {
758
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
759
}
656
760
if(ret < 0){
657
761
perror("asprintf");
658
762
continue;
659
763
}
660
764
661
765
ret = stat(filename, &st);
662
if (ret == -1){
766
if(ret == -1){
663
767
perror("stat");
664
768
free(filename);
665
769
continue;
666
770
}
667
668
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
771
772
/* Ignore non-executable files */
773
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
669
774
if(debug){
670
775
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
671
776
" with bad type or mode\n", filename);
673
778
free(filename);
674
779
continue;
675
780
}
676
plugin *p = getplugin(dirst->d_name, &plugin_list);
781
782
plugin *p = getplugin(dirst->d_name);
677
783
if(p == NULL){
678
784
perror("getplugin");
679
785
free(filename);
689
795
}
690
796
{
691
797
/* Add global arguments to argument list for this plugin */
692
plugin *g = getplugin(NULL, &plugin_list);
798
plugin *g = getplugin(NULL);
693
799
if(g != NULL){
694
800
for(char **a = g->argv + 1; *a != NULL; a++){
695
801
if(not add_argument(p, *a)){
698
804
}
699
805
/* Add global environment variables */
700
806
for(char **e = g->environ; *e != NULL; e++){
701
if(not add_environment(p, *e)){
807
if(not add_environment(p, *e, false)){
702
808
perror("add_environment");
703
809
}
704
810
}
709
815
process, too. */
710
816
if(p->environ[0] != NULL){
711
817
for(char **e = environ; *e != NULL; e++){
712
char *copy = strdup(*e);
713
if(copy == NULL){
714
perror("strdup");
715
continue;
716
}
717
if(not add_environment(p, copy)){
818
if(not add_environment(p, *e, false)){
718
819
perror("add_environment");
719
820
}
720
821
}
722
823
723
824
int pipefd[2];
724
825
ret = pipe(pipefd);
725
if (ret == -1){
826
if(ret == -1){
726
827
perror("pipe");
727
828
exitstatus = EXIT_FAILURE;
728
829
goto fallback;
729
830
}
831
/* Ask OS to automatic close the pipe on exec */
730
832
ret = set_cloexec_flag(pipefd[0]);
731
833
if(ret < 0){
732
834
perror("set_cloexec_flag");
740
842
goto fallback;
741
843
}
742
844
/* Block SIGCHLD until process is safely in process list */
743
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
845
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
744
846
if(ret < 0){
745
847
perror("sigprocmask");
746
848
exitstatus = EXIT_FAILURE;
747
849
goto fallback;
748
850
}
749
// Starting a new process to be watched
851
/* Starting a new process to be watched */
750
852
pid_t pid = fork();
751
853
if(pid == -1){
752
854
perror("fork");
760
862
perror("sigaction");
761
863
_exit(EXIT_FAILURE);
762
864
}
763
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
865
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
764
866
if(ret < 0){
765
867
perror("sigprocmask");
766
868
_exit(EXIT_FAILURE);
767
869
}
768
870
769
871
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
770
872
if(ret == -1){
771
873
perror("dup2");
790
892
}
791
893
/* no return */
792
894
}
793
/* parent process */
895
/* Parent process */
896
close(pipefd[1]); /* Close unused write end of pipe */
794
897
free(filename);
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);
898
plugin *new_plugin = getplugin(dirst->d_name);
899
if(new_plugin == NULL){
900
perror("getplugin");
901
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
800
902
if(ret < 0){
801
perror("sigprocmask");
903
perror("sigprocmask");
802
904
}
803
905
exitstatus = EXIT_FAILURE;
804
906
goto fallback;
805
907
}
806
908
807
*new_process = (struct process){ .pid = pid,
808
.fd = pipefd[0],
809
.next = process_list };
810
// List handling
811
process_list = new_process;
909
new_plugin->pid = pid;
910
new_plugin->fd = pipefd[0];
911
812
912
/* Unblock SIGCHLD so signal handler can be run if this process
813
913
has already completed */
814
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
914
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
815
915
if(ret < 0){
816
916
perror("sigprocmask");
817
917
exitstatus = EXIT_FAILURE;
818
918
goto fallback;
819
919
}
820
920
821
FD_SET(new_process->fd, &rfds_all);
921
FD_SET(new_plugin->fd, &rfds_all);
822
922
823
if (maxfd < new_process->fd){
824
maxfd = new_process->fd;
923
if(maxfd < new_plugin->fd){
924
maxfd = new_plugin->fd;
825
925
}
826
827
926
}
828
829
free_plugin_list(plugin_list);
830
plugin_list = NULL;
831
927
832
928
closedir(dir);
833
929
dir = NULL;
834
835
if (process_list == NULL){
836
fprintf(stderr, "No plugin processes started. Incorrect plugin"
837
" directory?\n");
838
process_list = NULL;
930
931
for(plugin *p = plugin_list; p != NULL; p = p->next){
932
if(p->pid != 0){
933
break;
934
}
935
if(p->next == NULL){
936
fprintf(stderr, "No plugin processes started. Incorrect plugin"
937
" directory?\n");
938
free_plugin_list();
939
}
839
940
}
840
while(process_list){
941
942
/* Main loop while running plugins exist */
943
while(plugin_list){
841
944
fd_set rfds = rfds_all;
842
945
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
843
if (select_ret == -1){
946
if(select_ret == -1){
844
947
perror("select");
845
948
exitstatus = EXIT_FAILURE;
846
949
goto fallback;
847
950
}
848
951
/* OK, now either a process completed, or something can be read
849
952
from one of them */
850
for(process *proc = process_list; proc ; proc = proc->next){
953
for(plugin *proc = plugin_list; proc != NULL;){
851
954
/* Is this process completely done? */
852
955
if(proc->eof and proc->completed){
853
956
/* Only accept the plugin output if it exited cleanly */
854
957
if(not WIFEXITED(proc->status)
855
958
or WEXITSTATUS(proc->status) != 0){
856
959
/* Bad exit by plugin */
960
857
961
if(debug){
858
962
if(WIFEXITED(proc->status)){
859
963
fprintf(stderr, "Plugin %u exited with status %d\n",
864
968
(unsigned int) (proc->pid),
865
969
WTERMSIG(proc->status));
866
970
} else if(WCOREDUMP(proc->status)){
867
fprintf(stderr, "Plugin %d dumped core\n",
971
fprintf(stderr, "Plugin %u dumped core\n",
868
972
(unsigned int) (proc->pid));
869
973
}
870
974
}
975
871
976
/* Remove the plugin */
872
977
FD_CLR(proc->fd, &rfds_all);
978
873
979
/* Block signal while modifying process_list */
874
980
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
875
981
if(ret < 0){
877
983
exitstatus = EXIT_FAILURE;
878
984
goto fallback;
879
985
}
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
}
986
987
plugin *next_plugin = proc->next;
988
free_plugin(proc);
989
proc = next_plugin;
990
893
991
/* We are done modifying process list, so unblock signal */
894
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
895
NULL);
992
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
993
NULL);
896
994
if(ret < 0){
897
995
perror("sigprocmask");
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;
996
exitstatus = EXIT_FAILURE;
997
goto fallback;
998
}
999
1000
if(plugin_list == NULL){
1001
break;
1002
}
1003
1004
continue;
905
1005
}
1006
906
1007
/* This process exited nicely, so print its buffer */
907
1008
908
1009
bool bret = print_out_password(proc->buffer,
909
1010
proc->buffer_length);
910
1011
if(not bret){
913
1014
}
914
1015
goto fallback;
915
1016
}
1017
916
1018
/* This process has not completed. Does it have any output? */
917
1019
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
918
1020
/* This process had nothing to say at this time */
1021
proc = proc->next;
919
1022
continue;
920
1023
}
921
1024
/* Before reading, make the process' data buffer large enough */
922
1025
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
923
1026
proc->buffer = realloc(proc->buffer, proc->buffer_size
924
1027
+ (size_t) BUFFER_SIZE);
925
if (proc->buffer == NULL){
1028
if(proc->buffer == NULL){
926
1029
perror("malloc");
927
1030
exitstatus = EXIT_FAILURE;
928
1031
goto fallback;
930
1033
proc->buffer_size += BUFFER_SIZE;
931
1034
}
932
1035
/* Read from the process */
933
ret = read(proc->fd, proc->buffer + proc->buffer_length,
934
BUFFER_SIZE);
935
if(ret < 0){
1036
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1037
BUFFER_SIZE);
1038
if(sret < 0){
936
1039
/* Read error from this process; ignore the error */
1040
proc = proc->next;
937
1041
continue;
938
1042
}
939
if(ret == 0){
1043
if(sret == 0){
940
1044
/* got EOF */
941
1045
proc->eof = true;
942
1046
} else {
943
proc->buffer_length += (size_t) ret;
1047
proc->buffer_length += (size_t) sret;
944
1048
}
945
1049
}
946
1050
}
948
1052
949
1053
fallback:
950
1054
951
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1055
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
952
1056
/* Fallback if all plugins failed, none are found or an error
953
1057
occured */
954
1058
bool bret;
955
1059
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
956
1060
char *passwordbuffer = getpass("Password: ");
957
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1061
size_t len = strlen(passwordbuffer);
1062
/* Strip trailing newline */
1063
if(len > 0 and passwordbuffer[len-1] == '\n'){
1064
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1065
len--;
1066
}
1067
bret = print_out_password(passwordbuffer, len);
958
1068
if(not bret){
959
1069
perror("print_out_password");
960
1070
exitstatus = EXIT_FAILURE;
967
1077
perror("sigaction");
968
1078
exitstatus = EXIT_FAILURE;
969
1079
}
970
1080
971
1081
if(custom_argv != NULL){
972
1082
for(char **arg = custom_argv+1; *arg != NULL; arg++){
973
1083
free(*arg);
974
1084
}
975
1085
free(custom_argv);
976
1086
}
977
free_plugin_list(plugin_list);
978
1087
979
1088
if(dir != NULL){
980
1089
closedir(dir);
981
1090
}
982
1091
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");
1092
/* Kill the processes */
1093
for(plugin *p = plugin_list; p != NULL; p = p->next){
1094
if(p->pid != 0){
1095
close(p->fd);
1096
ret = kill(p->pid, SIGTERM);
1097
if(ret == -1 and errno != ESRCH){
1098
/* Set-uid proccesses might not get closed */
1099
perror("kill");
1100
}
991
1101
}
992
free(process_list->buffer);
993
free(process_list);
994
1102
}
995
1103
996
1104
/* Wait for any remaining child processes to terminate */
1000
1108
if(errno != ECHILD){
1001
1109
perror("wait");
1002
1110
}
1003
1111
1112
free_plugin_list();
1113
1004
1114
free(plugindir);
1005
1115
free(argfile);
1006
1116
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0