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- Committer: Björn Påhlsson
- Date: 2009-01-16 23:19:44 UTC
- mfrom: (271 mandos)
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 291.
- Revision ID: belorn@braxen-20090116231944-qw97sandjaohrywo
merge
- 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,
63
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
65
SIG_UNBLOCK, kill() */
65
66
#include <errno.h> /* errno, EBADF */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
66
68
67
69
#define BUFFER_SIZE 256
68
70
69
71
#define PDIR "/lib/mandos/plugins.d"
70
72
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
73
72
const char *argp_program_version = "plugin-runner 1.0";
74
const char *argp_program_version = "plugin-runner " VERSION;
73
75
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
76
75
struct process;
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;
76
84
77
typedef struct process{
85
/* Variables used for running processes*/
78
86
pid_t pid;
79
87
int fd;
80
88
char *buffer;
83
91
bool eof;
84
92
volatile bool completed;
85
93
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
94
struct plugin *next;
97
95
} plugin;
98
96
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))){
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))){
103
106
return p;
104
107
}
105
108
}
106
109
/* Create a new plugin */
107
110
plugin *new_plugin = malloc(sizeof(plugin));
108
if (new_plugin == NULL){
111
if(new_plugin == NULL){
109
112
return NULL;
110
113
}
111
114
char *copy_name = NULL;
118
121
119
122
*new_plugin = (plugin) { .name = copy_name,
120
123
.argc = 1,
121
.envc = 0,
122
124
.disabled = false,
123
.next = *plugin_list };
125
.next = plugin_list };
124
126
125
127
new_plugin->argv = malloc(sizeof(char *) * 2);
126
if (new_plugin->argv == NULL){
128
if(new_plugin->argv == NULL){
127
129
free(copy_name);
128
130
free(new_plugin);
129
131
return NULL;
130
132
}
131
133
new_plugin->argv[0] = copy_name;
132
134
new_plugin->argv[1] = NULL;
133
135
134
136
new_plugin->environ = malloc(sizeof(char *));
135
137
if(new_plugin->environ == NULL){
136
138
free(copy_name);
139
141
return NULL;
140
142
}
141
143
new_plugin->environ[0] = NULL;
144
142
145
/* Append the new plugin to the list */
143
*plugin_list = new_plugin;
146
plugin_list = new_plugin;
144
147
return new_plugin;
145
148
}
146
149
176
179
}
177
180
178
181
/* Add to a plugin's environment */
179
static bool add_environment(plugin *p, const char *def){
182
static bool add_environment(plugin *p, const char *def, bool replace){
180
183
if(p == NULL){
181
184
return false;
182
185
}
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
}
183
203
return add_to_char_array(def, &(p->environ), &(p->envc));
184
204
}
185
205
186
187
206
/*
188
207
* Based on the example in the GNU LibC manual chapter 13.13 "File
189
208
* Descriptor Flags".
190
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
191
210
*/
192
static int set_cloexec_flag(int fd)
193
{
211
static int set_cloexec_flag(int fd){
194
212
int ret = fcntl(fd, F_GETFD, 0);
195
213
/* If reading the flags failed, return error indication now. */
196
214
if(ret < 0){
200
218
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
201
219
}
202
220
203
process *process_list = NULL;
204
221
205
222
/* Mark processes as completed when they exit, and save their exit
206
223
status. */
207
void handle_sigchld(__attribute__((unused)) int sig){
224
static void handle_sigchld(__attribute__((unused)) int sig){
208
225
while(true){
209
process *proc = process_list;
226
plugin *proc = plugin_list;
210
227
int status;
211
228
pid_t pid = waitpid(-1, &status, WNOHANG);
212
229
if(pid == 0){
214
231
break;
215
232
}
216
233
if(pid == -1){
217
if (errno != ECHILD){
234
if(errno != ECHILD){
218
235
perror("waitpid");
219
236
}
220
237
/* No child processes */
221
238
break;
222
239
}
223
240
224
241
/* A child exited, find it in process_list */
225
242
while(proc != NULL and proc->pid != pid){
226
243
proc = proc->next;
234
251
}
235
252
}
236
253
237
bool print_out_password(const char *buffer, size_t length){
254
/* Prints out a password to stdout */
255
static bool print_out_password(const char *buffer, size_t length){
238
256
ssize_t ret;
239
if(length>0 and buffer[length-1] == '\n'){
240
length--;
241
}
242
257
for(size_t written = 0; written < length; written += (size_t)ret){
243
258
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
244
259
length - written));
249
264
return true;
250
265
}
251
266
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);
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);
264
300
}
265
301
}
266
302
273
309
struct dirent *dirst;
274
310
struct stat st;
275
311
fd_set rfds_all;
276
int ret, maxfd = 0;
312
int ret, numchars, maxfd = 0;
313
ssize_t sret;
314
intmax_t tmpmax;
277
315
uid_t uid = 65534;
278
316
gid_t gid = 65534;
279
317
bool debug = false;
304
342
{ .name = "global-options", .key = 'g',
305
343
.arg = "OPTION[,OPTION[,...]]",
306
344
.doc = "Options passed to all plugins" },
307
{ .name = "global-envs", .key = 'e',
345
{ .name = "global-env", .key = 'G',
308
346
.arg = "VAR=value",
309
347
.doc = "Environment variable passed to all plugins" },
310
348
{ .name = "options-for", .key = 'o',
311
349
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
312
350
.doc = "Options passed only to specified plugin" },
313
{ .name = "envs-for", .key = 'f',
351
{ .name = "env-for", .key = 'E',
314
352
.arg = "PLUGIN:ENV=value",
315
353
.doc = "Environment variable passed to specified plugin" },
316
354
{ .name = "disable", .key = 'd',
317
355
.arg = "PLUGIN",
318
356
.doc = "Disable a specific plugin", .group = 1 },
357
{ .name = "enable", .key = 'e',
358
.arg = "PLUGIN",
359
.doc = "Enable a specific plugin", .group = 1 },
319
360
{ .name = "plugin-dir", .key = 128,
320
361
.arg = "DIRECTORY",
321
362
.doc = "Specify a different plugin directory", .group = 2 },
333
374
{ .name = NULL }
334
375
};
335
376
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){
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){
343
382
char *p;
344
383
while((p = strsep(&arg, ",")) != NULL){
345
384
if(p[0] == '\0'){
346
385
continue;
347
386
}
348
if(not add_argument(getplugin(NULL, plugins), p)){
387
if(not add_argument(getplugin(NULL), p)){
349
388
perror("add_argument");
350
389
return ARGP_ERR_UNKNOWN;
351
390
}
352
391
}
353
392
}
354
393
break;
355
case 'e':
394
case 'G': /* --global-env */
356
395
if(arg == NULL){
357
396
break;
358
397
}
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
}
398
if(not add_environment(getplugin(NULL), arg, true)){
399
perror("add_environment");
367
400
}
368
401
break;
369
case 'o':
370
if (arg != NULL){
402
case 'o': /* --options-for */
403
if(arg != NULL){
371
404
char *p_name = strsep(&arg, ":");
372
if(p_name[0] == '\0'){
405
if(p_name[0] == '\0' or arg == NULL){
373
406
break;
374
407
}
375
408
char *opt = strsep(&arg, ":");
376
if(opt[0] == '\0'){
409
if(opt[0] == '\0' or opt == NULL){
377
410
break;
378
411
}
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
}
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;
389
420
}
390
421
}
391
422
}
392
423
break;
393
case 'f':
424
case 'E': /* --env-for */
394
425
if(arg == NULL){
395
426
break;
396
427
}
399
430
if(envdef == NULL){
400
431
break;
401
432
}
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)){
433
*envdef = '\0';
434
if(not add_environment(getplugin(arg), envdef+1, true)){
408
435
perror("add_environment");
409
436
}
410
437
}
411
438
break;
412
case 'd':
413
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
439
case 'd': /* --disable */
440
if(arg != NULL){
441
plugin *p = getplugin(arg);
415
442
if(p == NULL){
416
443
return ARGP_ERR_UNKNOWN;
417
444
}
418
445
p->disabled = true;
419
446
}
420
447
break;
421
case 128:
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);
422
459
plugindir = strdup(arg);
423
460
if(plugindir == NULL){
424
461
perror("strdup");
425
462
}
426
463
break;
427
case 129:
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);
428
526
argfile = strdup(arg);
429
527
if(argfile == NULL){
430
528
perror("strdup");
431
529
}
432
530
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;
531
case 130: /* --userid */
532
case 131: /* --groupid */
533
case 132: /* --debug */
442
534
case ARGP_KEY_ARG:
443
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
444
break;
445
535
case ARGP_KEY_END:
446
536
break;
447
537
default:
450
540
return 0;
451
541
}
452
542
453
plugin *plugin_list = NULL;
454
455
struct argp argp = { .options = options, .parser = parse_opt,
456
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
543
struct argp argp = { .options = options,
544
.parser = parse_opt_config_file,
545
.args_doc = "",
457
546
.doc = "Mandos plugin runner -- Run plugins" };
458
547
459
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
460
if (ret == ARGP_ERR_UNKNOWN){
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){
461
552
fprintf(stderr, "Unknown error while parsing arguments\n");
462
553
exitstatus = EXIT_FAILURE;
463
554
goto fallback;
464
555
}
465
466
if (argfile == NULL){
556
557
/* Reset to the normal argument parser */
558
argp.parser = parse_opt;
559
560
/* Open the configfile if available */
561
if(argfile == NULL){
467
562
conffp = fopen(AFILE, "r");
468
563
} else {
469
564
conffp = fopen(argfile, "r");
470
}
471
565
}
472
566
if(conffp != NULL){
473
567
char *org_line = NULL;
474
568
char *p, *arg, *new_arg, *line;
475
569
size_t size = 0;
476
ssize_t sret;
477
570
const char whitespace_delims[] = " \r\t\f\v\n";
478
571
const char comment_delim[] = "#";
479
572
486
579
}
487
580
custom_argv[0] = argv[0];
488
581
custom_argv[1] = NULL;
489
582
583
/* for each line in the config file, strip whitespace and ignore
584
commented text */
490
585
while(true){
491
586
sret = getline(&org_line, &size, conffp);
492
587
if(sret == -1){
521
616
}
522
617
}
523
618
free(org_line);
524
} else{
619
} else {
525
620
/* Check for harmful errors and go to fallback. Other errors might
526
621
not affect opening plugins */
527
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
622
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
528
623
perror("fopen");
529
624
exitstatus = EXIT_FAILURE;
530
625
goto fallback;
531
626
}
532
627
}
533
628
/* If there was any arguments from configuration file,
629
pass them to parser as command arguments */
534
630
if(custom_argv != NULL){
535
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
536
if (ret == ARGP_ERR_UNKNOWN){
631
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
632
0, NULL);
633
if(ret == ARGP_ERR_UNKNOWN){
537
634
fprintf(stderr, "Unknown error while parsing arguments\n");
538
635
exitstatus = EXIT_FAILURE;
539
636
goto fallback;
540
637
}
541
638
}
542
639
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
543
649
if(debug){
544
650
for(plugin *p = plugin_list; p != NULL; p=p->next){
545
651
fprintf(stderr, "Plugin: %s has %d arguments\n",
547
653
for(char **a = p->argv; *a != NULL; a++){
548
654
fprintf(stderr, "\tArg: %s\n", *a);
549
655
}
550
fprintf(stderr, "...and %u environment variables\n", p->envc);
656
fprintf(stderr, "...and %d environment variables\n", p->envc);
551
657
for(char **a = p->environ; *a != NULL; a++){
552
658
fprintf(stderr, "\t%s\n", *a);
553
659
}
554
660
}
555
661
}
556
662
663
/* Strip permissions down to nobody */
557
664
ret = setuid(uid);
558
if (ret == -1){
665
if(ret == -1){
559
666
perror("setuid");
560
}
561
667
}
562
668
setgid(gid);
563
if (ret == -1){
669
if(ret == -1){
564
670
perror("setgid");
565
671
}
566
567
if (plugindir == NULL){
672
673
if(plugindir == NULL){
568
674
dir = opendir(PDIR);
569
675
} else {
570
676
dir = opendir(plugindir);
591
697
592
698
FD_ZERO(&rfds_all);
593
699
700
/* Read and execute any executable in the plugin directory*/
594
701
while(true){
595
702
dirst = readdir(dir);
596
703
597
// All directory entries have been processed
704
/* All directory entries have been processed */
598
705
if(dirst == NULL){
599
if (errno == EBADF){
706
if(errno == EBADF){
600
707
perror("readdir");
601
708
exitstatus = EXIT_FAILURE;
602
709
goto fallback;
606
713
607
714
d_name_len = strlen(dirst->d_name);
608
715
609
// Ignore dotfiles, backup files and other junk
716
/* Ignore dotfiles, backup files and other junk */
610
717
{
611
718
bool bad_name = false;
612
719
614
721
615
722
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
616
723
".dpkg-old",
724
".dpkg-bak",
617
725
".dpkg-divert", NULL };
618
726
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
619
727
size_t pre_len = strlen(*pre);
627
735
break;
628
736
}
629
737
}
630
631
738
if(bad_name){
632
739
continue;
633
740
}
634
635
741
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
636
742
size_t suf_len = strlen(*suf);
637
743
if((d_name_len >= suf_len)
652
758
}
653
759
654
760
char *filename;
655
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
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
}
656
766
if(ret < 0){
657
767
perror("asprintf");
658
768
continue;
659
769
}
660
770
661
771
ret = stat(filename, &st);
662
if (ret == -1){
772
if(ret == -1){
663
773
perror("stat");
664
774
free(filename);
665
775
continue;
666
776
}
667
668
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
777
778
/* Ignore non-executable files */
779
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
669
780
if(debug){
670
781
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
671
782
" with bad type or mode\n", filename);
673
784
free(filename);
674
785
continue;
675
786
}
676
plugin *p = getplugin(dirst->d_name, &plugin_list);
787
788
plugin *p = getplugin(dirst->d_name);
677
789
if(p == NULL){
678
790
perror("getplugin");
679
791
free(filename);
689
801
}
690
802
{
691
803
/* Add global arguments to argument list for this plugin */
692
plugin *g = getplugin(NULL, &plugin_list);
804
plugin *g = getplugin(NULL);
693
805
if(g != NULL){
694
806
for(char **a = g->argv + 1; *a != NULL; a++){
695
807
if(not add_argument(p, *a)){
698
810
}
699
811
/* Add global environment variables */
700
812
for(char **e = g->environ; *e != NULL; e++){
701
if(not add_environment(p, *e)){
813
if(not add_environment(p, *e, false)){
702
814
perror("add_environment");
703
815
}
704
816
}
709
821
process, too. */
710
822
if(p->environ[0] != NULL){
711
823
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)){
824
if(not add_environment(p, *e, false)){
718
825
perror("add_environment");
719
826
}
720
827
}
722
829
723
830
int pipefd[2];
724
831
ret = pipe(pipefd);
725
if (ret == -1){
832
if(ret == -1){
726
833
perror("pipe");
727
834
exitstatus = EXIT_FAILURE;
728
835
goto fallback;
729
836
}
837
/* Ask OS to automatic close the pipe on exec */
730
838
ret = set_cloexec_flag(pipefd[0]);
731
839
if(ret < 0){
732
840
perror("set_cloexec_flag");
740
848
goto fallback;
741
849
}
742
850
/* Block SIGCHLD until process is safely in process list */
743
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
851
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
744
852
if(ret < 0){
745
853
perror("sigprocmask");
746
854
exitstatus = EXIT_FAILURE;
747
855
goto fallback;
748
856
}
749
// Starting a new process to be watched
857
/* Starting a new process to be watched */
750
858
pid_t pid = fork();
751
859
if(pid == -1){
752
860
perror("fork");
760
868
perror("sigaction");
761
869
_exit(EXIT_FAILURE);
762
870
}
763
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
871
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
764
872
if(ret < 0){
765
873
perror("sigprocmask");
766
874
_exit(EXIT_FAILURE);
767
875
}
768
876
769
877
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
770
878
if(ret == -1){
771
879
perror("dup2");
790
898
}
791
899
/* no return */
792
900
}
793
/* parent process */
901
/* Parent process */
902
close(pipefd[1]); /* Close unused write end of pipe */
794
903
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);
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);
800
908
if(ret < 0){
801
perror("sigprocmask");
909
perror("sigprocmask");
802
910
}
803
911
exitstatus = EXIT_FAILURE;
804
912
goto fallback;
805
913
}
806
914
807
*new_process = (struct process){ .pid = pid,
808
.fd = pipefd[0],
809
.next = process_list };
810
// List handling
811
process_list = new_process;
915
new_plugin->pid = pid;
916
new_plugin->fd = pipefd[0];
917
812
918
/* Unblock SIGCHLD so signal handler can be run if this process
813
919
has already completed */
814
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
920
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
815
921
if(ret < 0){
816
922
perror("sigprocmask");
817
923
exitstatus = EXIT_FAILURE;
818
924
goto fallback;
819
925
}
820
926
821
FD_SET(new_process->fd, &rfds_all);
927
FD_SET(new_plugin->fd, &rfds_all);
822
928
823
if (maxfd < new_process->fd){
824
maxfd = new_process->fd;
929
if(maxfd < new_plugin->fd){
930
maxfd = new_plugin->fd;
825
931
}
826
827
932
}
828
829
free_plugin_list(plugin_list);
830
plugin_list = NULL;
831
933
832
934
closedir(dir);
833
935
dir = NULL;
834
835
if (process_list == NULL){
836
fprintf(stderr, "No plugin processes started. Incorrect plugin"
837
" directory?\n");
838
process_list = 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
}
839
946
}
840
while(process_list){
947
948
/* Main loop while running plugins exist */
949
while(plugin_list){
841
950
fd_set rfds = rfds_all;
842
951
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
843
if (select_ret == -1){
952
if(select_ret == -1){
844
953
perror("select");
845
954
exitstatus = EXIT_FAILURE;
846
955
goto fallback;
847
956
}
848
957
/* OK, now either a process completed, or something can be read
849
958
from one of them */
850
for(process *proc = process_list; proc ; proc = proc->next){
959
for(plugin *proc = plugin_list; proc != NULL;){
851
960
/* Is this process completely done? */
852
961
if(proc->eof and proc->completed){
853
962
/* Only accept the plugin output if it exited cleanly */
854
963
if(not WIFEXITED(proc->status)
855
964
or WEXITSTATUS(proc->status) != 0){
856
965
/* Bad exit by plugin */
966
857
967
if(debug){
858
968
if(WIFEXITED(proc->status)){
859
fprintf(stderr, "Plugin %u exited with status %d\n",
860
(unsigned int) (proc->pid),
969
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
970
" %d\n", (intmax_t) (proc->pid),
861
971
WEXITSTATUS(proc->status));
862
972
} else if(WIFSIGNALED(proc->status)) {
863
fprintf(stderr, "Plugin %u killed by signal %d\n",
864
(unsigned int) (proc->pid),
973
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
974
" %d\n", (intmax_t) (proc->pid),
865
975
WTERMSIG(proc->status));
866
976
} else if(WCOREDUMP(proc->status)){
867
fprintf(stderr, "Plugin %d dumped core\n",
868
(unsigned int) (proc->pid));
977
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
978
(intmax_t) (proc->pid));
869
979
}
870
980
}
981
871
982
/* Remove the plugin */
872
983
FD_CLR(proc->fd, &rfds_all);
984
873
985
/* Block signal while modifying process_list */
874
986
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
875
987
if(ret < 0){
877
989
exitstatus = EXIT_FAILURE;
878
990
goto fallback;
879
991
}
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
}
992
993
plugin *next_plugin = proc->next;
994
free_plugin(proc);
995
proc = next_plugin;
996
893
997
/* We are done modifying process list, so unblock signal */
894
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
895
NULL);
998
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
999
NULL);
896
1000
if(ret < 0){
897
1001
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;
1002
exitstatus = EXIT_FAILURE;
1003
goto fallback;
1004
}
1005
1006
if(plugin_list == NULL){
1007
break;
1008
}
1009
1010
continue;
905
1011
}
1012
906
1013
/* This process exited nicely, so print its buffer */
907
1014
908
1015
bool bret = print_out_password(proc->buffer,
909
1016
proc->buffer_length);
910
1017
if(not bret){
913
1020
}
914
1021
goto fallback;
915
1022
}
1023
916
1024
/* This process has not completed. Does it have any output? */
917
1025
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
918
1026
/* This process had nothing to say at this time */
1027
proc = proc->next;
919
1028
continue;
920
1029
}
921
1030
/* Before reading, make the process' data buffer large enough */
922
1031
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
923
1032
proc->buffer = realloc(proc->buffer, proc->buffer_size
924
1033
+ (size_t) BUFFER_SIZE);
925
if (proc->buffer == NULL){
1034
if(proc->buffer == NULL){
926
1035
perror("malloc");
927
1036
exitstatus = EXIT_FAILURE;
928
1037
goto fallback;
930
1039
proc->buffer_size += BUFFER_SIZE;
931
1040
}
932
1041
/* Read from the process */
933
ret = read(proc->fd, proc->buffer + proc->buffer_length,
934
BUFFER_SIZE);
935
if(ret < 0){
1042
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1043
BUFFER_SIZE);
1044
if(sret < 0){
936
1045
/* Read error from this process; ignore the error */
1046
proc = proc->next;
937
1047
continue;
938
1048
}
939
if(ret == 0){
1049
if(sret == 0){
940
1050
/* got EOF */
941
1051
proc->eof = true;
942
1052
} else {
943
proc->buffer_length += (size_t) ret;
1053
proc->buffer_length += (size_t) sret;
944
1054
}
945
1055
}
946
1056
}
948
1058
949
1059
fallback:
950
1060
951
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1061
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
952
1062
/* Fallback if all plugins failed, none are found or an error
953
1063
occured */
954
1064
bool bret;
955
1065
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
956
1066
char *passwordbuffer = getpass("Password: ");
957
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
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);
958
1074
if(not bret){
959
1075
perror("print_out_password");
960
1076
exitstatus = EXIT_FAILURE;
967
1083
perror("sigaction");
968
1084
exitstatus = EXIT_FAILURE;
969
1085
}
970
1086
971
1087
if(custom_argv != NULL){
972
1088
for(char **arg = custom_argv+1; *arg != NULL; arg++){
973
1089
free(*arg);
974
1090
}
975
1091
free(custom_argv);
976
1092
}
977
free_plugin_list(plugin_list);
978
1093
979
1094
if(dir != NULL){
980
1095
closedir(dir);
981
1096
}
982
1097
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");
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
}
991
1107
}
992
free(process_list->buffer);
993
free(process_list);
994
1108
}
995
1109
996
1110
/* Wait for any remaining child processes to terminate */
1000
1114
if(errno != ECHILD){
1001
1115
perror("wait");
1002
1116
}
1003
1117
1118
free_plugin_list();
1119
1004
1120
free(plugindir);
1005
1121
free(argfile);
1006
1122
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0