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- Committer: Teddy Hogeborn
- Date: 2012-06-17 14:55:31 UTC
- Revision ID: teddy@recompile.se-20120617145531-o24z982oerm6xb6s
* mandos: New "--foreground" option.
- files added:
- DBUS-API
- debian/source
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
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 © 2008-2012 Teddy Hogeborn
6
* Copyright © 2008-2012 Björn Påhlsson
7
7
*
8
8
* This program is free software: you can redistribute it and/or
9
9
* modify it under the terms of the GNU General Public License as
19
19
* along with this program. If not, see
20
20
* <http://www.gnu.org/licenses/>.
21
21
*
22
* Contact the authors at <mandos@fukt.bsnet.se>.
22
* Contact the authors at <mandos@recompile.se>.
23
23
*/
24
24
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf() */
26
asprintf(), O_CLOEXEC */
27
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
30
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
31
#include <stdio.h> /* fileno(), fprintf(),
32
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
34
34
stat, waitpid(), WIFEXITED(),
35
35
WEXITSTATUS(), wait(), pid_t,
36
36
uid_t, gid_t, getuid(), getgid(),
42
42
WCOREDUMP() */
43
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
44
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
46
46
readdir(), closedir(), dirfd() */
47
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
48
fcntl(), setuid(), setgid(),
54
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
55
FD_CLOEXEC */
56
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
57
strsignal(), strcmp(), strncmp() */
58
58
#include <errno.h> /* errno */
59
59
#include <argp.h> /* struct argp_option, struct
60
60
argp_state, struct argp,
68
68
*/
69
69
#include <errno.h> /* errno, EBADF */
70
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
71
75
72
76
#define BUFFER_SIZE 256
73
77
75
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
76
80
77
81
const char *argp_program_version = "plugin-runner " VERSION;
78
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
79
83
80
84
typedef struct plugin{
81
85
char *name; /* can be NULL or any plugin name */
102
106
/* Gets an existing plugin based on name,
103
107
or if none is found, creates a new one */
104
108
static plugin *getplugin(char *name){
105
/* Check for exiting plugin with that name */
109
/* Check for existing plugin with that name */
106
110
for(plugin *p = plugin_list; p != NULL; p = p->next){
107
111
if((p->name == name)
108
112
or (p->name and name and (strcmp(p->name, name) == 0))){
110
114
}
111
115
}
112
116
/* Create a new plugin */
113
plugin *new_plugin = malloc(sizeof(plugin));
117
plugin *new_plugin = NULL;
118
do {
119
new_plugin = malloc(sizeof(plugin));
120
} while(new_plugin == NULL and errno == EINTR);
114
121
if(new_plugin == NULL){
115
122
return NULL;
116
123
}
117
124
char *copy_name = NULL;
118
125
if(name != NULL){
119
copy_name = strdup(name);
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
120
129
if(copy_name == NULL){
130
int e = errno;
121
131
free(new_plugin);
132
errno = e;
122
133
return NULL;
123
134
}
124
135
}
128
139
.disabled = false,
129
140
.next = plugin_list };
130
141
131
new_plugin->argv = malloc(sizeof(char *) * 2);
142
do {
143
new_plugin->argv = malloc(sizeof(char *) * 2);
144
} while(new_plugin->argv == NULL and errno == EINTR);
132
145
if(new_plugin->argv == NULL){
146
int e = errno;
133
147
free(copy_name);
134
148
free(new_plugin);
149
errno = e;
135
150
return NULL;
136
151
}
137
152
new_plugin->argv[0] = copy_name;
138
153
new_plugin->argv[1] = NULL;
139
154
140
new_plugin->environ = malloc(sizeof(char *));
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
141
158
if(new_plugin->environ == NULL){
159
int e = errno;
142
160
free(copy_name);
143
161
free(new_plugin->argv);
144
162
free(new_plugin);
163
errno = e;
145
164
return NULL;
146
165
}
147
166
new_plugin->environ[0] = NULL;
152
171
}
153
172
154
173
/* Helper function for add_argument and add_environment */
174
__attribute__((nonnull))
155
175
static bool add_to_char_array(const char *new, char ***array,
156
176
int *len){
157
177
/* Resize the pointed-to array to hold one more pointer */
158
*array = realloc(*array, sizeof(char *)
159
* (size_t) ((*len) + 2));
178
do {
179
*array = realloc(*array, sizeof(char *)
180
* (size_t) ((*len) + 2));
181
} while(*array == NULL and errno == EINTR);
160
182
/* Malloc check */
161
183
if(*array == NULL){
162
184
return false;
163
185
}
164
186
/* Make a copy of the new string */
165
char *copy = strdup(new);
187
char *copy;
188
do {
189
copy = strdup(new);
190
} while(copy == NULL and errno == EINTR);
166
191
if(copy == NULL){
167
192
return false;
168
193
}
175
200
}
176
201
177
202
/* Add to a plugin's argument vector */
203
__attribute__((nonnull(2)))
178
204
static bool add_argument(plugin *p, const char *arg){
179
205
if(p == NULL){
180
206
return false;
183
209
}
184
210
185
211
/* Add to a plugin's environment */
212
__attribute__((nonnull(2)))
186
213
static bool add_environment(plugin *p, const char *def, bool replace){
187
214
if(p == NULL){
188
215
return false;
194
221
if(strncmp(*e, def, namelen + 1) == 0){
195
222
/* It already exists */
196
223
if(replace){
197
char *new = realloc(*e, strlen(def) + 1);
224
char *new;
225
do {
226
new = realloc(*e, strlen(def) + 1);
227
} while(new == NULL and errno == EINTR);
198
228
if(new == NULL){
199
229
return false;
200
230
}
210
240
/*
211
241
* Based on the example in the GNU LibC manual chapter 13.13 "File
212
242
* Descriptor Flags".
213
* *Note File Descriptor Flags:(libc)Descriptor Flags.
243
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
214
244
*/
215
245
static int set_cloexec_flag(int fd){
216
int ret = fcntl(fd, F_GETFD, 0);
246
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
217
247
/* If reading the flags failed, return error indication now. */
218
248
if(ret < 0){
219
249
return ret;
220
250
}
221
251
/* Store modified flag word in the descriptor. */
222
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
252
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
253
ret | FD_CLOEXEC));
223
254
}
224
255
225
256
240
271
/* No child processes */
241
272
break;
242
273
}
243
perror("waitpid");
274
error(0, errno, "waitpid");
244
275
}
245
276
246
277
/* A child exited, find it in process_list */
258
289
}
259
290
260
291
/* Prints out a password to stdout */
292
__attribute__((nonnull))
261
293
static bool print_out_password(const char *buffer, size_t length){
262
294
ssize_t ret;
263
295
for(size_t written = 0; written < length; written += (size_t)ret){
271
303
}
272
304
273
305
/* Removes and free a plugin from the plugin list */
306
__attribute__((nonnull))
274
307
static void free_plugin(plugin *plugin_node){
275
308
276
309
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
317
350
fd_set rfds_all;
318
351
int ret, maxfd = 0;
319
352
ssize_t sret;
320
intmax_t tmpmax;
321
353
uid_t uid = 65534;
322
354
gid_t gid = 65534;
323
355
bool debug = false;
332
364
sigemptyset(&sigchld_action.sa_mask);
333
365
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
334
366
if(ret == -1){
335
perror("sigaddset");
336
exitstatus = EXIT_FAILURE;
367
error(0, errno, "sigaddset");
368
exitstatus = EX_OSERR;
337
369
goto fallback;
338
370
}
339
371
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
340
372
if(ret == -1){
341
perror("sigaction");
342
exitstatus = EXIT_FAILURE;
373
error(0, errno, "sigaction");
374
exitstatus = EX_OSERR;
343
375
goto fallback;
344
376
}
345
377
377
409
.doc = "Group ID the plugins will run as", .group = 3 },
378
410
{ .name = "debug", .key = 132,
379
411
.doc = "Debug mode", .group = 4 },
412
/*
413
* These reproduce what we would get without ARGP_NO_HELP
414
*/
415
{ .name = "help", .key = '?',
416
.doc = "Give this help list", .group = -1 },
417
{ .name = "usage", .key = -3,
418
.doc = "Give a short usage message", .group = -1 },
419
{ .name = "version", .key = 'V',
420
.doc = "Print program version", .group = -1 },
380
421
{ .name = NULL }
381
422
};
382
423
383
error_t parse_opt(int key, char *arg, __attribute__((unused))
384
struct argp_state *state){
385
char *tmp;
424
__attribute__((nonnull(3)))
425
error_t parse_opt(int key, char *arg, struct argp_state *state){
426
errno = 0;
386
427
switch(key){
428
char *tmp;
429
intmax_t tmp_id;
387
430
case 'g': /* --global-options */
388
if(arg != NULL){
431
{
389
432
char *plugin_option;
390
433
while((plugin_option = strsep(&arg, ",")) != NULL){
391
if(plugin_option[0] == '\0'){
392
continue;
393
}
394
434
if(not add_argument(getplugin(NULL), plugin_option)){
395
perror("add_argument");
396
return ARGP_ERR_UNKNOWN;
435
break;
397
436
}
398
437
}
399
438
}
400
439
break;
401
440
case 'G': /* --global-env */
402
if(arg == NULL){
403
break;
404
}
405
if(not add_environment(getplugin(NULL), arg, true)){
406
perror("add_environment");
407
}
441
add_environment(getplugin(NULL), arg, true);
408
442
break;
409
443
case 'o': /* --options-for */
410
if(arg != NULL){
411
char *plugin_name = strsep(&arg, ":");
412
if(plugin_name[0] == '\0'){
413
break;
414
}
415
char *plugin_option;
416
while((plugin_option = strsep(&arg, ",")) != NULL){
417
if(not add_argument(getplugin(plugin_name), plugin_option)){
418
perror("add_argument");
419
return ARGP_ERR_UNKNOWN;
444
{
445
char *option_list = strchr(arg, ':');
446
if(option_list == NULL){
447
argp_error(state, "No colon in \"%s\"", arg);
448
errno = EINVAL;
449
break;
450
}
451
*option_list = '\0';
452
option_list++;
453
if(arg[0] == '\0'){
454
argp_error(state, "Empty plugin name");
455
errno = EINVAL;
456
break;
457
}
458
char *option;
459
while((option = strsep(&option_list, ",")) != NULL){
460
if(not add_argument(getplugin(arg), option)){
461
break;
420
462
}
421
463
}
422
464
}
423
465
break;
424
466
case 'E': /* --env-for */
425
if(arg == NULL){
426
break;
427
}
428
467
{
429
468
char *envdef = strchr(arg, ':');
430
469
if(envdef == NULL){
470
argp_error(state, "No colon in \"%s\"", arg);
471
errno = EINVAL;
431
472
break;
432
473
}
433
474
*envdef = '\0';
434
if(not add_environment(getplugin(arg), envdef+1, true)){
435
perror("add_environment");
475
envdef++;
476
if(arg[0] == '\0'){
477
argp_error(state, "Empty plugin name");
478
errno = EINVAL;
479
break;
436
480
}
481
add_environment(getplugin(arg), envdef, true);
437
482
}
438
483
break;
439
484
case 'd': /* --disable */
440
if(arg != NULL){
485
{
441
486
plugin *p = getplugin(arg);
442
if(p == NULL){
443
return ARGP_ERR_UNKNOWN;
487
if(p != NULL){
488
p->disabled = true;
444
489
}
445
p->disabled = true;
446
490
}
447
491
break;
448
492
case 'e': /* --enable */
449
if(arg != NULL){
493
{
450
494
plugin *p = getplugin(arg);
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
495
if(p != NULL){
496
p->disabled = false;
453
497
}
454
p->disabled = false;
455
498
}
456
499
break;
457
500
case 128: /* --plugin-dir */
458
501
free(plugindir);
459
502
plugindir = strdup(arg);
460
if(plugindir == NULL){
461
perror("strdup");
462
}
463
503
break;
464
504
case 129: /* --config-file */
465
505
/* This is already done by parse_opt_config_file() */
466
506
break;
467
507
case 130: /* --userid */
468
errno = 0;
469
tmpmax = strtoimax(arg, &tmp, 10);
508
tmp_id = strtoimax(arg, &tmp, 10);
470
509
if(errno != 0 or tmp == arg or *tmp != '\0'
471
or tmpmax != (uid_t)tmpmax){
472
fprintf(stderr, "Bad user ID number: \"%s\", using %"
473
PRIdMAX "\n", arg, (intmax_t)uid);
474
} else {
475
uid = (uid_t)tmpmax;
510
or tmp_id != (uid_t)tmp_id){
511
argp_error(state, "Bad user ID number: \"%s\", using %"
512
PRIdMAX, arg, (intmax_t)uid);
513
break;
476
514
}
515
uid = (uid_t)tmp_id;
477
516
break;
478
517
case 131: /* --groupid */
479
errno = 0;
480
tmpmax = strtoimax(arg, &tmp, 10);
518
tmp_id = strtoimax(arg, &tmp, 10);
481
519
if(errno != 0 or tmp == arg or *tmp != '\0'
482
or tmpmax != (gid_t)tmpmax){
483
fprintf(stderr, "Bad group ID number: \"%s\", using %"
484
PRIdMAX "\n", arg, (intmax_t)gid);
485
} else {
486
gid = (gid_t)tmpmax;
520
or tmp_id != (gid_t)tmp_id){
521
argp_error(state, "Bad group ID number: \"%s\", using %"
522
PRIdMAX, arg, (intmax_t)gid);
523
break;
487
524
}
525
gid = (gid_t)tmp_id;
488
526
break;
489
527
case 132: /* --debug */
490
528
debug = true;
491
529
break;
530
/*
531
* These reproduce what we would get without ARGP_NO_HELP
532
*/
533
case '?': /* --help */
534
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
535
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
536
case -3: /* --usage */
537
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
538
argp_state_help(state, state->out_stream,
539
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
540
case 'V': /* --version */
541
fprintf(state->out_stream, "%s\n", argp_program_version);
542
exit(EXIT_SUCCESS);
543
break;
492
544
/*
493
545
* When adding more options before this line, remember to also add a
494
546
* "case" to the "parse_opt_config_file" function below.
497
549
/* Cryptsetup always passes an argument, which is an empty
498
550
string if "none" was specified in /etc/crypttab. So if
499
551
argument was empty, we ignore it silently. */
500
if(arg[0] != '\0'){
501
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
552
if(arg[0] == '\0'){
553
break;
502
554
}
503
break;
504
case ARGP_KEY_END:
505
break;
506
555
default:
507
556
return ARGP_ERR_UNKNOWN;
508
557
}
509
return 0;
558
return errno; /* Set to 0 at start */
510
559
}
511
560
512
561
/* This option parser is the same as parse_opt() above, except it
514
563
error_t parse_opt_config_file(int key, char *arg,
515
564
__attribute__((unused))
516
565
struct argp_state *state){
566
errno = 0;
517
567
switch(key){
518
568
case 'g': /* --global-options */
519
569
case 'G': /* --global-env */
526
576
case 129: /* --config-file */
527
577
free(argfile);
528
578
argfile = strdup(arg);
529
if(argfile == NULL){
530
perror("strdup");
531
}
532
579
break;
533
580
case 130: /* --userid */
534
581
case 131: /* --groupid */
535
582
case 132: /* --debug */
583
case '?': /* --help */
584
case -3: /* --usage */
585
case 'V': /* --version */
536
586
case ARGP_KEY_ARG:
537
case ARGP_KEY_END:
538
587
break;
539
588
default:
540
589
return ARGP_ERR_UNKNOWN;
541
590
}
542
return 0;
591
return errno;
543
592
}
544
593
545
594
struct argp argp = { .options = options,
549
598
550
599
/* Parse using parse_opt_config_file() in order to get the custom
551
600
config file location, if any. */
552
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
553
if(ret == ARGP_ERR_UNKNOWN){
554
fprintf(stderr, "Unknown error while parsing arguments\n");
555
exitstatus = EXIT_FAILURE;
601
ret = argp_parse(&argp, argc, argv,
602
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
603
NULL, NULL);
604
switch(ret){
605
case 0:
606
break;
607
case ENOMEM:
608
default:
609
errno = ret;
610
error(0, errno, "argp_parse");
611
exitstatus = EX_OSERR;
612
goto fallback;
613
case EINVAL:
614
exitstatus = EX_USAGE;
556
615
goto fallback;
557
616
}
558
617
575
634
custom_argc = 1;
576
635
custom_argv = malloc(sizeof(char*) * 2);
577
636
if(custom_argv == NULL){
578
perror("malloc");
579
exitstatus = EXIT_FAILURE;
637
error(0, errno, "malloc");
638
exitstatus = EX_OSERR;
580
639
goto fallback;
581
640
}
582
641
custom_argv[0] = argv[0];
598
657
}
599
658
new_arg = strdup(p);
600
659
if(new_arg == NULL){
601
perror("strdup");
602
exitstatus = EXIT_FAILURE;
660
error(0, errno, "strdup");
661
exitstatus = EX_OSERR;
603
662
free(org_line);
604
663
goto fallback;
605
664
}
608
667
custom_argv = realloc(custom_argv, sizeof(char *)
609
668
* ((unsigned int) custom_argc + 1));
610
669
if(custom_argv == NULL){
611
perror("realloc");
612
exitstatus = EXIT_FAILURE;
670
error(0, errno, "realloc");
671
exitstatus = EX_OSERR;
613
672
free(org_line);
614
673
goto fallback;
615
674
}
617
676
custom_argv[custom_argc] = NULL;
618
677
}
619
678
}
679
do {
680
ret = fclose(conffp);
681
} while(ret == EOF and errno == EINTR);
682
if(ret == EOF){
683
error(0, errno, "fclose");
684
exitstatus = EX_IOERR;
685
goto fallback;
686
}
620
687
free(org_line);
621
688
} else {
622
689
/* Check for harmful errors and go to fallback. Other errors might
623
690
not affect opening plugins */
624
691
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
625
perror("fopen");
626
exitstatus = EXIT_FAILURE;
692
error(0, errno, "fopen");
693
exitstatus = EX_OSERR;
627
694
goto fallback;
628
695
}
629
696
}
630
/* If there was any arguments from configuration file,
631
pass them to parser as command arguments */
697
/* If there were any arguments from the configuration file, pass
698
them to parser as command line arguments */
632
699
if(custom_argv != NULL){
633
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
634
0, NULL);
635
if(ret == ARGP_ERR_UNKNOWN){
636
fprintf(stderr, "Unknown error while parsing arguments\n");
637
exitstatus = EXIT_FAILURE;
700
ret = argp_parse(&argp, custom_argc, custom_argv,
701
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
702
NULL, NULL);
703
switch(ret){
704
case 0:
705
break;
706
case ENOMEM:
707
default:
708
errno = ret;
709
error(0, errno, "argp_parse");
710
exitstatus = EX_OSERR;
711
goto fallback;
712
case EINVAL:
713
exitstatus = EX_CONFIG;
638
714
goto fallback;
639
715
}
640
716
}
641
717
642
718
/* Parse actual command line arguments, to let them override the
643
719
config file */
644
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
645
if(ret == ARGP_ERR_UNKNOWN){
646
fprintf(stderr, "Unknown error while parsing arguments\n");
647
exitstatus = EXIT_FAILURE;
720
ret = argp_parse(&argp, argc, argv,
721
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
722
NULL, NULL);
723
switch(ret){
724
case 0:
725
break;
726
case ENOMEM:
727
default:
728
errno = ret;
729
error(0, errno, "argp_parse");
730
exitstatus = EX_OSERR;
731
goto fallback;
732
case EINVAL:
733
exitstatus = EX_USAGE;
648
734
goto fallback;
649
735
}
650
736
662
748
}
663
749
}
664
750
665
/* Strip permissions down to nobody */
751
if(getuid() == 0){
752
/* Work around Debian bug #633582:
753
<http://bugs.debian.org/633582> */
754
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
755
if(plugindir_fd == -1){
756
error(0, errno, "open");
757
} else {
758
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
759
if(ret == -1){
760
error(0, errno, "fstat");
761
} else {
762
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
763
ret = fchown(plugindir_fd, uid, gid);
764
if(ret == -1){
765
error(0, errno, "fchown");
766
}
767
}
768
}
769
TEMP_FAILURE_RETRY(close(plugindir_fd));
770
}
771
}
772
773
/* Lower permissions */
666
774
setgid(gid);
667
775
if(ret == -1){
668
perror("setgid");
776
error(0, errno, "setgid");
669
777
}
670
778
ret = setuid(uid);
671
779
if(ret == -1){
672
perror("setuid");
673
}
674
675
if(plugindir == NULL){
676
dir = opendir(PDIR);
677
} else {
678
dir = opendir(plugindir);
679
}
680
681
if(dir == NULL){
682
perror("Could not open plugin dir");
683
exitstatus = EXIT_FAILURE;
684
goto fallback;
685
}
686
687
/* Set the FD_CLOEXEC flag on the directory, if possible */
780
error(0, errno, "setuid");
781
}
782
783
/* Open plugin directory with close_on_exec flag */
688
784
{
689
int dir_fd = dirfd(dir);
690
if(dir_fd >= 0){
691
ret = set_cloexec_flag(dir_fd);
692
if(ret < 0){
693
perror("set_cloexec_flag");
694
exitstatus = EXIT_FAILURE;
695
goto fallback;
696
}
785
int dir_fd = -1;
786
if(plugindir == NULL){
787
dir_fd = open(PDIR, O_RDONLY |
788
#ifdef O_CLOEXEC
789
O_CLOEXEC
790
#else /* not O_CLOEXEC */
791
0
792
#endif /* not O_CLOEXEC */
793
);
794
} else {
795
dir_fd = open(plugindir, O_RDONLY |
796
#ifdef O_CLOEXEC
797
O_CLOEXEC
798
#else /* not O_CLOEXEC */
799
0
800
#endif /* not O_CLOEXEC */
801
);
802
}
803
if(dir_fd == -1){
804
error(0, errno, "Could not open plugin dir");
805
exitstatus = EX_UNAVAILABLE;
806
goto fallback;
807
}
808
809
#ifndef O_CLOEXEC
810
/* Set the FD_CLOEXEC flag on the directory */
811
ret = set_cloexec_flag(dir_fd);
812
if(ret < 0){
813
error(0, errno, "set_cloexec_flag");
814
TEMP_FAILURE_RETRY(close(dir_fd));
815
exitstatus = EX_OSERR;
816
goto fallback;
817
}
818
#endif /* O_CLOEXEC */
819
820
dir = fdopendir(dir_fd);
821
if(dir == NULL){
822
error(0, errno, "Could not open plugin dir");
823
TEMP_FAILURE_RETRY(close(dir_fd));
824
exitstatus = EX_OSERR;
825
goto fallback;
697
826
}
698
827
}
699
828
701
830
702
831
/* Read and execute any executable in the plugin directory*/
703
832
while(true){
704
dirst = readdir(dir);
833
do {
834
dirst = readdir(dir);
835
} while(dirst == NULL and errno == EINTR);
705
836
706
837
/* All directory entries have been processed */
707
838
if(dirst == NULL){
708
839
if(errno == EBADF){
709
perror("readdir");
710
exitstatus = EXIT_FAILURE;
840
error(0, errno, "readdir");
841
exitstatus = EX_IOERR;
711
842
goto fallback;
712
843
}
713
844
break;
743
874
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
744
875
size_t suf_len = strlen(*suf);
745
876
if((d_name_len >= suf_len)
746
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
877
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
747
878
== 0)){
748
879
if(debug){
749
880
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
761
892
762
893
char *filename;
763
894
if(plugindir == NULL){
764
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
895
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
896
dirst->d_name));
765
897
} else {
766
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
898
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
899
plugindir,
900
dirst->d_name));
767
901
}
768
902
if(ret < 0){
769
perror("asprintf");
903
error(0, errno, "asprintf");
770
904
continue;
771
905
}
772
906
773
ret = stat(filename, &st);
907
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
774
908
if(ret == -1){
775
perror("stat");
909
error(0, errno, "stat");
776
910
free(filename);
777
911
continue;
778
912
}
779
913
780
914
/* Ignore non-executable files */
781
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
915
if(not S_ISREG(st.st_mode)
916
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
782
917
if(debug){
783
918
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
784
919
" with bad type or mode\n", filename);
789
924
790
925
plugin *p = getplugin(dirst->d_name);
791
926
if(p == NULL){
792
perror("getplugin");
927
error(0, errno, "getplugin");
793
928
free(filename);
794
929
continue;
795
930
}
807
942
if(g != NULL){
808
943
for(char **a = g->argv + 1; *a != NULL; a++){
809
944
if(not add_argument(p, *a)){
810
perror("add_argument");
945
error(0, errno, "add_argument");
811
946
}
812
947
}
813
948
/* Add global environment variables */
814
949
for(char **e = g->environ; *e != NULL; e++){
815
950
if(not add_environment(p, *e, false)){
816
perror("add_environment");
951
error(0, errno, "add_environment");
817
952
}
818
953
}
819
954
}
824
959
if(p->environ[0] != NULL){
825
960
for(char **e = environ; *e != NULL; e++){
826
961
if(not add_environment(p, *e, false)){
827
perror("add_environment");
962
error(0, errno, "add_environment");
828
963
}
829
964
}
830
965
}
831
966
832
967
int pipefd[2];
833
ret = pipe(pipefd);
968
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
834
969
if(ret == -1){
835
perror("pipe");
836
exitstatus = EXIT_FAILURE;
970
error(0, errno, "pipe");
971
exitstatus = EX_OSERR;
837
972
goto fallback;
838
973
}
839
974
/* Ask OS to automatic close the pipe on exec */
840
975
ret = set_cloexec_flag(pipefd[0]);
841
976
if(ret < 0){
842
perror("set_cloexec_flag");
843
exitstatus = EXIT_FAILURE;
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
844
979
goto fallback;
845
980
}
846
981
ret = set_cloexec_flag(pipefd[1]);
847
982
if(ret < 0){
848
perror("set_cloexec_flag");
849
exitstatus = EXIT_FAILURE;
983
error(0, errno, "set_cloexec_flag");
984
exitstatus = EX_OSERR;
850
985
goto fallback;
851
986
}
852
987
/* Block SIGCHLD until process is safely in process list */
853
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
988
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
989
&sigchld_action.sa_mask,
990
NULL));
854
991
if(ret < 0){
855
perror("sigprocmask");
856
exitstatus = EXIT_FAILURE;
992
error(0, errno, "sigprocmask");
993
exitstatus = EX_OSERR;
857
994
goto fallback;
858
995
}
859
996
/* Starting a new process to be watched */
860
pid_t pid = fork();
997
pid_t pid;
998
do {
999
pid = fork();
1000
} while(pid == -1 and errno == EINTR);
861
1001
if(pid == -1){
862
perror("fork");
863
exitstatus = EXIT_FAILURE;
1002
error(0, errno, "fork");
1003
exitstatus = EX_OSERR;
864
1004
goto fallback;
865
1005
}
866
1006
if(pid == 0){
867
1007
/* this is the child process */
868
1008
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
869
1009
if(ret < 0){
870
perror("sigaction");
871
_exit(EXIT_FAILURE);
1010
error(0, errno, "sigaction");
1011
_exit(EX_OSERR);
872
1012
}
873
1013
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
874
1014
if(ret < 0){
875
perror("sigprocmask");
876
_exit(EXIT_FAILURE);
1015
error(0, errno, "sigprocmask");
1016
_exit(EX_OSERR);
877
1017
}
878
1018
879
1019
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
880
1020
if(ret == -1){
881
perror("dup2");
882
_exit(EXIT_FAILURE);
1021
error(0, errno, "dup2");
1022
_exit(EX_OSERR);
883
1023
}
884
1024
885
1025
if(dirfd(dir) < 0){
889
1029
}
890
1030
if(p->environ[0] == NULL){
891
1031
if(execv(filename, p->argv) < 0){
892
perror("execv");
893
_exit(EXIT_FAILURE);
1032
error(0, errno, "execv for %s", filename);
1033
_exit(EX_OSERR);
894
1034
}
895
1035
} else {
896
1036
if(execve(filename, p->argv, p->environ) < 0){
897
perror("execve");
898
_exit(EXIT_FAILURE);
1037
error(0, errno, "execve for %s", filename);
1038
_exit(EX_OSERR);
899
1039
}
900
1040
}
901
1041
/* no return */
902
1042
}
903
1043
/* Parent process */
904
close(pipefd[1]); /* Close unused write end of pipe */
1044
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1045
pipe */
905
1046
free(filename);
906
1047
plugin *new_plugin = getplugin(dirst->d_name);
907
1048
if(new_plugin == NULL){
908
perror("getplugin");
909
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1049
error(0, errno, "getplugin");
1050
ret = (int)(TEMP_FAILURE_RETRY
1051
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1052
NULL)));
910
1053
if(ret < 0){
911
perror("sigprocmask");
1054
error(0, errno, "sigprocmask");
912
1055
}
913
exitstatus = EXIT_FAILURE;
1056
exitstatus = EX_OSERR;
914
1057
goto fallback;
915
1058
}
916
1059
919
1062
920
1063
/* Unblock SIGCHLD so signal handler can be run if this process
921
1064
has already completed */
922
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1065
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1066
&sigchld_action.sa_mask,
1067
NULL));
923
1068
if(ret < 0){
924
perror("sigprocmask");
925
exitstatus = EXIT_FAILURE;
1069
error(0, errno, "sigprocmask");
1070
exitstatus = EX_OSERR;
926
1071
goto fallback;
927
1072
}
928
1073
929
FD_SET(new_plugin->fd, &rfds_all);
1074
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1075
-Wconversion */
930
1076
931
1077
if(maxfd < new_plugin->fd){
932
1078
maxfd = new_plugin->fd;
933
1079
}
934
1080
}
935
1081
936
closedir(dir);
1082
TEMP_FAILURE_RETRY(closedir(dir));
937
1083
dir = NULL;
938
1084
free_plugin(getplugin(NULL));
939
1085
952
1098
while(plugin_list){
953
1099
fd_set rfds = rfds_all;
954
1100
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
955
if(select_ret == -1){
956
perror("select");
957
exitstatus = EXIT_FAILURE;
1101
if(select_ret == -1 and errno != EINTR){
1102
error(0, errno, "select");
1103
exitstatus = EX_OSERR;
958
1104
goto fallback;
959
1105
}
960
1106
/* OK, now either a process completed, or something can be read
986
1132
}
987
1133
988
1134
/* Remove the plugin */
989
FD_CLR(proc->fd, &rfds_all);
1135
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1136
-Wconversion */
990
1137
991
1138
/* Block signal while modifying process_list */
992
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1139
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1140
(SIG_BLOCK,
1141
&sigchld_action.sa_mask,
1142
NULL));
993
1143
if(ret < 0){
994
perror("sigprocmask");
995
exitstatus = EXIT_FAILURE;
1144
error(0, errno, "sigprocmask");
1145
exitstatus = EX_OSERR;
996
1146
goto fallback;
997
1147
}
998
1148
1001
1151
proc = next_plugin;
1002
1152
1003
1153
/* We are done modifying process list, so unblock signal */
1004
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1005
NULL);
1154
ret = (int)(TEMP_FAILURE_RETRY
1155
(sigprocmask(SIG_UNBLOCK,
1156
&sigchld_action.sa_mask, NULL)));
1006
1157
if(ret < 0){
1007
perror("sigprocmask");
1008
exitstatus = EXIT_FAILURE;
1158
error(0, errno, "sigprocmask");
1159
exitstatus = EX_OSERR;
1009
1160
goto fallback;
1010
1161
}
1011
1162
1021
1172
bool bret = print_out_password(proc->buffer,
1022
1173
proc->buffer_length);
1023
1174
if(not bret){
1024
perror("print_out_password");
1025
exitstatus = EXIT_FAILURE;
1175
error(0, errno, "print_out_password");
1176
exitstatus = EX_IOERR;
1026
1177
}
1027
1178
goto fallback;
1028
1179
}
1029
1180
1030
1181
/* This process has not completed. Does it have any output? */
1031
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1182
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1183
warning from
1184
-Wconversion */
1032
1185
/* This process had nothing to say at this time */
1033
1186
proc = proc->next;
1034
1187
continue;
1038
1191
proc->buffer = realloc(proc->buffer, proc->buffer_size
1039
1192
+ (size_t) BUFFER_SIZE);
1040
1193
if(proc->buffer == NULL){
1041
perror("malloc");
1042
exitstatus = EXIT_FAILURE;
1194
error(0, errno, "malloc");
1195
exitstatus = EX_OSERR;
1043
1196
goto fallback;
1044
1197
}
1045
1198
proc->buffer_size += BUFFER_SIZE;
1046
1199
}
1047
1200
/* Read from the process */
1048
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1049
BUFFER_SIZE);
1201
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1202
proc->buffer
1203
+ proc->buffer_length,
1204
BUFFER_SIZE));
1050
1205
if(sret < 0){
1051
1206
/* Read error from this process; ignore the error */
1052
1207
proc = proc->next;
1064
1219
1065
1220
fallback:
1066
1221
1067
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1222
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1223
and exitstatus != EX_OK)){
1068
1224
/* Fallback if all plugins failed, none are found or an error
1069
1225
occured */
1070
1226
bool bret;
1078
1234
}
1079
1235
bret = print_out_password(passwordbuffer, len);
1080
1236
if(not bret){
1081
perror("print_out_password");
1082
exitstatus = EXIT_FAILURE;
1237
error(0, errno, "print_out_password");
1238
exitstatus = EX_IOERR;
1083
1239
}
1084
1240
}
1085
1241
1086
1242
/* Restore old signal handler */
1087
1243
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1088
1244
if(ret == -1){
1089
perror("sigaction");
1090
exitstatus = EXIT_FAILURE;
1245
error(0, errno, "sigaction");
1246
exitstatus = EX_OSERR;
1091
1247
}
1092
1248
1093
1249
if(custom_argv != NULL){
1108
1264
ret = kill(p->pid, SIGTERM);
1109
1265
if(ret == -1 and errno != ESRCH){
1110
1266
/* Set-uid proccesses might not get closed */
1111
perror("kill");
1267
error(0, errno, "kill");
1112
1268
}
1113
1269
}
1114
1270
}
1115
1271
1116
1272
/* Wait for any remaining child processes to terminate */
1117
do{
1273
do {
1118
1274
ret = wait(NULL);
1119
1275
} while(ret >= 0);
1120
1276
if(errno != ECHILD){
1121
perror("wait");
1277
error(0, errno, "wait");
1122
1278
}
1123
1279
1124
1280
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0