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- Committer: Björn Påhlsson
- Date: 2009-09-07 22:21:35 UTC
- mfrom: (358 mandos)
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 415.
- Revision ID: belorn@braxen-20090907222135-pk7qmvsg3bmqqo5i
merge
- files removed:
- DBUS-API
- debian/source
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008-2012 Teddy Hogeborn
6
* Copyright © 2008-2012 Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 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@recompile.se>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
23
23
*/
24
24
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
26
asprintf() */
27
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
30
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* fileno(), fprintf(),
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
33
#include <sys/types.h> /* DIR, opendir(), 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, fdopendir(),
45
#include <dirent.h> /* DIR, struct dirent, opendir(),
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(), strcmp(), strncmp() */
57
strsignal() */
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() */
75
71
76
72
#define BUFFER_SIZE 256
77
73
79
75
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
76
81
77
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
78
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
83
79
84
80
typedef struct plugin{
85
81
char *name; /* can be NULL or any plugin name */
106
102
/* Gets an existing plugin based on name,
107
103
or if none is found, creates a new one */
108
104
static plugin *getplugin(char *name){
109
/* Check for existing plugin with that name */
105
/* Check for exiting plugin with that name */
110
106
for(plugin *p = plugin_list; p != NULL; p = p->next){
111
107
if((p->name == name)
112
108
or (p->name and name and (strcmp(p->name, name) == 0))){
114
110
}
115
111
}
116
112
/* Create a new plugin */
117
plugin *new_plugin = NULL;
118
do {
119
new_plugin = malloc(sizeof(plugin));
120
} while(new_plugin == NULL and errno == EINTR);
113
plugin *new_plugin = malloc(sizeof(plugin));
121
114
if(new_plugin == NULL){
122
115
return NULL;
123
116
}
124
117
char *copy_name = NULL;
125
118
if(name != NULL){
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
119
copy_name = strdup(name);
129
120
if(copy_name == NULL){
130
int e = errno;
131
121
free(new_plugin);
132
errno = e;
133
122
return NULL;
134
123
}
135
124
}
139
128
.disabled = false,
140
129
.next = plugin_list };
141
130
142
do {
143
new_plugin->argv = malloc(sizeof(char *) * 2);
144
} while(new_plugin->argv == NULL and errno == EINTR);
131
new_plugin->argv = malloc(sizeof(char *) * 2);
145
132
if(new_plugin->argv == NULL){
146
int e = errno;
147
133
free(copy_name);
148
134
free(new_plugin);
149
errno = e;
150
135
return NULL;
151
136
}
152
137
new_plugin->argv[0] = copy_name;
153
138
new_plugin->argv[1] = NULL;
154
139
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
140
new_plugin->environ = malloc(sizeof(char *));
158
141
if(new_plugin->environ == NULL){
159
int e = errno;
160
142
free(copy_name);
161
143
free(new_plugin->argv);
162
144
free(new_plugin);
163
errno = e;
164
145
return NULL;
165
146
}
166
147
new_plugin->environ[0] = NULL;
171
152
}
172
153
173
154
/* Helper function for add_argument and add_environment */
174
__attribute__((nonnull))
175
155
static bool add_to_char_array(const char *new, char ***array,
176
156
int *len){
177
157
/* Resize the pointed-to array to hold one more pointer */
178
do {
179
*array = realloc(*array, sizeof(char *)
180
* (size_t) ((*len) + 2));
181
} while(*array == NULL and errno == EINTR);
158
*array = realloc(*array, sizeof(char *)
159
* (size_t) ((*len) + 2));
182
160
/* Malloc check */
183
161
if(*array == NULL){
184
162
return false;
185
163
}
186
164
/* Make a copy of the new string */
187
char *copy;
188
do {
189
copy = strdup(new);
190
} while(copy == NULL and errno == EINTR);
165
char *copy = strdup(new);
191
166
if(copy == NULL){
192
167
return false;
193
168
}
200
175
}
201
176
202
177
/* Add to a plugin's argument vector */
203
__attribute__((nonnull(2)))
204
178
static bool add_argument(plugin *p, const char *arg){
205
179
if(p == NULL){
206
180
return false;
209
183
}
210
184
211
185
/* Add to a plugin's environment */
212
__attribute__((nonnull(2)))
213
186
static bool add_environment(plugin *p, const char *def, bool replace){
214
187
if(p == NULL){
215
188
return false;
221
194
if(strncmp(*e, def, namelen + 1) == 0){
222
195
/* It already exists */
223
196
if(replace){
224
char *new;
225
do {
226
new = realloc(*e, strlen(def) + 1);
227
} while(new == NULL and errno == EINTR);
197
char *new = realloc(*e, strlen(def) + 1);
228
198
if(new == NULL){
229
199
return false;
230
200
}
240
210
/*
241
211
* Based on the example in the GNU LibC manual chapter 13.13 "File
242
212
* Descriptor Flags".
243
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
213
* *Note File Descriptor Flags:(libc)Descriptor Flags.
244
214
*/
245
215
static int set_cloexec_flag(int fd){
246
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
216
int ret = fcntl(fd, F_GETFD, 0);
247
217
/* If reading the flags failed, return error indication now. */
248
218
if(ret < 0){
249
219
return ret;
250
220
}
251
221
/* Store modified flag word in the descriptor. */
252
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
253
ret | FD_CLOEXEC));
222
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
254
223
}
255
224
256
225
271
240
/* No child processes */
272
241
break;
273
242
}
274
error(0, errno, "waitpid");
243
perror("waitpid");
275
244
}
276
245
277
246
/* A child exited, find it in process_list */
289
258
}
290
259
291
260
/* Prints out a password to stdout */
292
__attribute__((nonnull))
293
261
static bool print_out_password(const char *buffer, size_t length){
294
262
ssize_t ret;
295
263
for(size_t written = 0; written < length; written += (size_t)ret){
303
271
}
304
272
305
273
/* Removes and free a plugin from the plugin list */
306
__attribute__((nonnull))
307
274
static void free_plugin(plugin *plugin_node){
308
275
309
276
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
350
317
fd_set rfds_all;
351
318
int ret, maxfd = 0;
352
319
ssize_t sret;
320
intmax_t tmpmax;
353
321
uid_t uid = 65534;
354
322
gid_t gid = 65534;
355
323
bool debug = false;
364
332
sigemptyset(&sigchld_action.sa_mask);
365
333
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
366
334
if(ret == -1){
367
error(0, errno, "sigaddset");
368
exitstatus = EX_OSERR;
335
perror("sigaddset");
336
exitstatus = EXIT_FAILURE;
369
337
goto fallback;
370
338
}
371
339
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
372
340
if(ret == -1){
373
error(0, errno, "sigaction");
374
exitstatus = EX_OSERR;
341
perror("sigaction");
342
exitstatus = EXIT_FAILURE;
375
343
goto fallback;
376
344
}
377
345
409
377
.doc = "Group ID the plugins will run as", .group = 3 },
410
378
{ .name = "debug", .key = 132,
411
379
.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 },
421
380
{ .name = NULL }
422
381
};
423
382
424
__attribute__((nonnull(3)))
425
error_t parse_opt(int key, char *arg, struct argp_state *state){
426
errno = 0;
383
error_t parse_opt(int key, char *arg, __attribute__((unused))
384
struct argp_state *state){
385
char *tmp;
427
386
switch(key){
428
char *tmp;
429
intmax_t tmp_id;
430
387
case 'g': /* --global-options */
431
{
388
if(arg != NULL){
432
389
char *plugin_option;
433
390
while((plugin_option = strsep(&arg, ",")) != NULL){
391
if(plugin_option[0] == '\0'){
392
continue;
393
}
434
394
if(not add_argument(getplugin(NULL), plugin_option)){
435
break;
395
perror("add_argument");
396
return ARGP_ERR_UNKNOWN;
436
397
}
437
398
}
438
399
}
439
400
break;
440
401
case 'G': /* --global-env */
441
add_environment(getplugin(NULL), arg, true);
402
if(arg == NULL){
403
break;
404
}
405
if(not add_environment(getplugin(NULL), arg, true)){
406
perror("add_environment");
407
}
442
408
break;
443
409
case 'o': /* --options-for */
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;
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;
462
420
}
463
421
}
464
422
}
465
423
break;
466
424
case 'E': /* --env-for */
425
if(arg == NULL){
426
break;
427
}
467
428
{
468
429
char *envdef = strchr(arg, ':');
469
430
if(envdef == NULL){
470
argp_error(state, "No colon in \"%s\"", arg);
471
errno = EINVAL;
472
431
break;
473
432
}
474
433
*envdef = '\0';
475
envdef++;
476
if(arg[0] == '\0'){
477
argp_error(state, "Empty plugin name");
478
errno = EINVAL;
479
break;
434
if(not add_environment(getplugin(arg), envdef+1, true)){
435
perror("add_environment");
480
436
}
481
add_environment(getplugin(arg), envdef, true);
482
437
}
483
438
break;
484
439
case 'd': /* --disable */
485
{
440
if(arg != NULL){
486
441
plugin *p = getplugin(arg);
487
if(p != NULL){
488
p->disabled = true;
442
if(p == NULL){
443
return ARGP_ERR_UNKNOWN;
489
444
}
445
p->disabled = true;
490
446
}
491
447
break;
492
448
case 'e': /* --enable */
493
{
449
if(arg != NULL){
494
450
plugin *p = getplugin(arg);
495
if(p != NULL){
496
p->disabled = false;
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
497
453
}
454
p->disabled = false;
498
455
}
499
456
break;
500
457
case 128: /* --plugin-dir */
501
458
free(plugindir);
502
459
plugindir = strdup(arg);
460
if(plugindir == NULL){
461
perror("strdup");
462
}
503
463
break;
504
464
case 129: /* --config-file */
505
465
/* This is already done by parse_opt_config_file() */
506
466
break;
507
467
case 130: /* --userid */
508
tmp_id = strtoimax(arg, &tmp, 10);
468
errno = 0;
469
tmpmax = strtoimax(arg, &tmp, 10);
509
470
if(errno != 0 or tmp == arg or *tmp != '\0'
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;
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;
514
476
}
515
uid = (uid_t)tmp_id;
516
477
break;
517
478
case 131: /* --groupid */
518
tmp_id = strtoimax(arg, &tmp, 10);
479
errno = 0;
480
tmpmax = strtoimax(arg, &tmp, 10);
519
481
if(errno != 0 or tmp == arg or *tmp != '\0'
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;
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;
524
487
}
525
gid = (gid_t)tmp_id;
526
488
break;
527
489
case 132: /* --debug */
528
490
debug = true;
529
491
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;
544
492
/*
545
493
* When adding more options before this line, remember to also add a
546
494
* "case" to the "parse_opt_config_file" function below.
549
497
/* Cryptsetup always passes an argument, which is an empty
550
498
string if "none" was specified in /etc/crypttab. So if
551
499
argument was empty, we ignore it silently. */
552
if(arg[0] == '\0'){
553
break;
500
if(arg[0] != '\0'){
501
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
554
502
}
503
break;
504
case ARGP_KEY_END:
505
break;
555
506
default:
556
507
return ARGP_ERR_UNKNOWN;
557
508
}
558
return errno; /* Set to 0 at start */
509
return 0;
559
510
}
560
511
561
512
/* This option parser is the same as parse_opt() above, except it
563
514
error_t parse_opt_config_file(int key, char *arg,
564
515
__attribute__((unused))
565
516
struct argp_state *state){
566
errno = 0;
567
517
switch(key){
568
518
case 'g': /* --global-options */
569
519
case 'G': /* --global-env */
576
526
case 129: /* --config-file */
577
527
free(argfile);
578
528
argfile = strdup(arg);
529
if(argfile == NULL){
530
perror("strdup");
531
}
579
532
break;
580
533
case 130: /* --userid */
581
534
case 131: /* --groupid */
582
535
case 132: /* --debug */
583
case '?': /* --help */
584
case -3: /* --usage */
585
case 'V': /* --version */
586
536
case ARGP_KEY_ARG:
537
case ARGP_KEY_END:
587
538
break;
588
539
default:
589
540
return ARGP_ERR_UNKNOWN;
590
541
}
591
return errno;
542
return 0;
592
543
}
593
544
594
545
struct argp argp = { .options = options,
598
549
599
550
/* Parse using parse_opt_config_file() in order to get the custom
600
551
config file location, if any. */
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;
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;
615
556
goto fallback;
616
557
}
617
558
634
575
custom_argc = 1;
635
576
custom_argv = malloc(sizeof(char*) * 2);
636
577
if(custom_argv == NULL){
637
error(0, errno, "malloc");
638
exitstatus = EX_OSERR;
578
perror("malloc");
579
exitstatus = EXIT_FAILURE;
639
580
goto fallback;
640
581
}
641
582
custom_argv[0] = argv[0];
657
598
}
658
599
new_arg = strdup(p);
659
600
if(new_arg == NULL){
660
error(0, errno, "strdup");
661
exitstatus = EX_OSERR;
601
perror("strdup");
602
exitstatus = EXIT_FAILURE;
662
603
free(org_line);
663
604
goto fallback;
664
605
}
667
608
custom_argv = realloc(custom_argv, sizeof(char *)
668
609
* ((unsigned int) custom_argc + 1));
669
610
if(custom_argv == NULL){
670
error(0, errno, "realloc");
671
exitstatus = EX_OSERR;
611
perror("realloc");
612
exitstatus = EXIT_FAILURE;
672
613
free(org_line);
673
614
goto fallback;
674
615
}
676
617
custom_argv[custom_argc] = NULL;
677
618
}
678
619
}
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
}
687
620
free(org_line);
688
621
} else {
689
622
/* Check for harmful errors and go to fallback. Other errors might
690
623
not affect opening plugins */
691
624
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
692
error(0, errno, "fopen");
693
exitstatus = EX_OSERR;
625
perror("fopen");
626
exitstatus = EXIT_FAILURE;
694
627
goto fallback;
695
628
}
696
629
}
697
/* If there were any arguments from the configuration file, pass
698
them to parser as command line arguments */
630
/* If there was any arguments from configuration file,
631
pass them to parser as command arguments */
699
632
if(custom_argv != NULL){
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;
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;
714
638
goto fallback;
715
639
}
716
640
}
717
641
718
642
/* Parse actual command line arguments, to let them override the
719
643
config file */
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;
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;
734
648
goto fallback;
735
649
}
736
650
748
662
}
749
663
}
750
664
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 */
665
/* Strip permissions down to nobody */
774
666
setgid(gid);
775
667
if(ret == -1){
776
error(0, errno, "setgid");
668
perror("setgid");
777
669
}
778
670
ret = setuid(uid);
779
671
if(ret == -1){
780
error(0, errno, "setuid");
781
}
782
783
/* Open plugin directory with close_on_exec flag */
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 */
784
688
{
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;
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
}
826
697
}
827
698
}
828
699
830
701
831
702
/* Read and execute any executable in the plugin directory*/
832
703
while(true){
833
do {
834
dirst = readdir(dir);
835
} while(dirst == NULL and errno == EINTR);
704
dirst = readdir(dir);
836
705
837
706
/* All directory entries have been processed */
838
707
if(dirst == NULL){
839
708
if(errno == EBADF){
840
error(0, errno, "readdir");
841
exitstatus = EX_IOERR;
709
perror("readdir");
710
exitstatus = EXIT_FAILURE;
842
711
goto fallback;
843
712
}
844
713
break;
874
743
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
875
744
size_t suf_len = strlen(*suf);
876
745
if((d_name_len >= suf_len)
877
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
746
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
878
747
== 0)){
879
748
if(debug){
880
749
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
892
761
893
762
char *filename;
894
763
if(plugindir == NULL){
895
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
896
dirst->d_name));
764
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
897
765
} else {
898
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
899
plugindir,
900
dirst->d_name));
766
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
901
767
}
902
768
if(ret < 0){
903
error(0, errno, "asprintf");
769
perror("asprintf");
904
770
continue;
905
771
}
906
772
907
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
773
ret = stat(filename, &st);
908
774
if(ret == -1){
909
error(0, errno, "stat");
775
perror("stat");
910
776
free(filename);
911
777
continue;
912
778
}
913
779
914
780
/* Ignore non-executable files */
915
if(not S_ISREG(st.st_mode)
916
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
781
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
917
782
if(debug){
918
783
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
919
784
" with bad type or mode\n", filename);
924
789
925
790
plugin *p = getplugin(dirst->d_name);
926
791
if(p == NULL){
927
error(0, errno, "getplugin");
792
perror("getplugin");
928
793
free(filename);
929
794
continue;
930
795
}
942
807
if(g != NULL){
943
808
for(char **a = g->argv + 1; *a != NULL; a++){
944
809
if(not add_argument(p, *a)){
945
error(0, errno, "add_argument");
810
perror("add_argument");
946
811
}
947
812
}
948
813
/* Add global environment variables */
949
814
for(char **e = g->environ; *e != NULL; e++){
950
815
if(not add_environment(p, *e, false)){
951
error(0, errno, "add_environment");
816
perror("add_environment");
952
817
}
953
818
}
954
819
}
959
824
if(p->environ[0] != NULL){
960
825
for(char **e = environ; *e != NULL; e++){
961
826
if(not add_environment(p, *e, false)){
962
error(0, errno, "add_environment");
827
perror("add_environment");
963
828
}
964
829
}
965
830
}
966
831
967
832
int pipefd[2];
968
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
833
ret = pipe(pipefd);
969
834
if(ret == -1){
970
error(0, errno, "pipe");
971
exitstatus = EX_OSERR;
835
perror("pipe");
836
exitstatus = EXIT_FAILURE;
972
837
goto fallback;
973
838
}
974
839
/* Ask OS to automatic close the pipe on exec */
975
840
ret = set_cloexec_flag(pipefd[0]);
976
841
if(ret < 0){
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
842
perror("set_cloexec_flag");
843
exitstatus = EXIT_FAILURE;
979
844
goto fallback;
980
845
}
981
846
ret = set_cloexec_flag(pipefd[1]);
982
847
if(ret < 0){
983
error(0, errno, "set_cloexec_flag");
984
exitstatus = EX_OSERR;
848
perror("set_cloexec_flag");
849
exitstatus = EXIT_FAILURE;
985
850
goto fallback;
986
851
}
987
852
/* Block SIGCHLD until process is safely in process list */
988
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
989
&sigchld_action.sa_mask,
990
NULL));
853
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
991
854
if(ret < 0){
992
error(0, errno, "sigprocmask");
993
exitstatus = EX_OSERR;
855
perror("sigprocmask");
856
exitstatus = EXIT_FAILURE;
994
857
goto fallback;
995
858
}
996
859
/* Starting a new process to be watched */
997
pid_t pid;
998
do {
999
pid = fork();
1000
} while(pid == -1 and errno == EINTR);
860
pid_t pid = fork();
1001
861
if(pid == -1){
1002
error(0, errno, "fork");
1003
exitstatus = EX_OSERR;
862
perror("fork");
863
exitstatus = EXIT_FAILURE;
1004
864
goto fallback;
1005
865
}
1006
866
if(pid == 0){
1007
867
/* this is the child process */
1008
868
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1009
869
if(ret < 0){
1010
error(0, errno, "sigaction");
1011
_exit(EX_OSERR);
870
perror("sigaction");
871
_exit(EXIT_FAILURE);
1012
872
}
1013
873
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1014
874
if(ret < 0){
1015
error(0, errno, "sigprocmask");
1016
_exit(EX_OSERR);
875
perror("sigprocmask");
876
_exit(EXIT_FAILURE);
1017
877
}
1018
878
1019
879
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1020
880
if(ret == -1){
1021
error(0, errno, "dup2");
1022
_exit(EX_OSERR);
881
perror("dup2");
882
_exit(EXIT_FAILURE);
1023
883
}
1024
884
1025
885
if(dirfd(dir) < 0){
1029
889
}
1030
890
if(p->environ[0] == NULL){
1031
891
if(execv(filename, p->argv) < 0){
1032
error(0, errno, "execv for %s", filename);
1033
_exit(EX_OSERR);
892
perror("execv");
893
_exit(EXIT_FAILURE);
1034
894
}
1035
895
} else {
1036
896
if(execve(filename, p->argv, p->environ) < 0){
1037
error(0, errno, "execve for %s", filename);
1038
_exit(EX_OSERR);
897
perror("execve");
898
_exit(EXIT_FAILURE);
1039
899
}
1040
900
}
1041
901
/* no return */
1042
902
}
1043
903
/* Parent process */
1044
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1045
pipe */
904
close(pipefd[1]); /* Close unused write end of pipe */
1046
905
free(filename);
1047
906
plugin *new_plugin = getplugin(dirst->d_name);
1048
907
if(new_plugin == NULL){
1049
error(0, errno, "getplugin");
1050
ret = (int)(TEMP_FAILURE_RETRY
1051
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1052
NULL)));
908
perror("getplugin");
909
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1053
910
if(ret < 0){
1054
error(0, errno, "sigprocmask");
911
perror("sigprocmask");
1055
912
}
1056
exitstatus = EX_OSERR;
913
exitstatus = EXIT_FAILURE;
1057
914
goto fallback;
1058
915
}
1059
916
1062
919
1063
920
/* Unblock SIGCHLD so signal handler can be run if this process
1064
921
has already completed */
1065
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1066
&sigchld_action.sa_mask,
1067
NULL));
922
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1068
923
if(ret < 0){
1069
error(0, errno, "sigprocmask");
1070
exitstatus = EX_OSERR;
924
perror("sigprocmask");
925
exitstatus = EXIT_FAILURE;
1071
926
goto fallback;
1072
927
}
1073
928
1074
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1075
-Wconversion */
929
FD_SET(new_plugin->fd, &rfds_all);
1076
930
1077
931
if(maxfd < new_plugin->fd){
1078
932
maxfd = new_plugin->fd;
1079
933
}
1080
934
}
1081
935
1082
TEMP_FAILURE_RETRY(closedir(dir));
936
closedir(dir);
1083
937
dir = NULL;
1084
938
free_plugin(getplugin(NULL));
1085
939
1098
952
while(plugin_list){
1099
953
fd_set rfds = rfds_all;
1100
954
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1101
if(select_ret == -1 and errno != EINTR){
1102
error(0, errno, "select");
1103
exitstatus = EX_OSERR;
955
if(select_ret == -1){
956
perror("select");
957
exitstatus = EXIT_FAILURE;
1104
958
goto fallback;
1105
959
}
1106
960
/* OK, now either a process completed, or something can be read
1132
986
}
1133
987
1134
988
/* Remove the plugin */
1135
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1136
-Wconversion */
989
FD_CLR(proc->fd, &rfds_all);
1137
990
1138
991
/* Block signal while modifying process_list */
1139
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1140
(SIG_BLOCK,
1141
&sigchld_action.sa_mask,
1142
NULL));
992
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1143
993
if(ret < 0){
1144
error(0, errno, "sigprocmask");
1145
exitstatus = EX_OSERR;
994
perror("sigprocmask");
995
exitstatus = EXIT_FAILURE;
1146
996
goto fallback;
1147
997
}
1148
998
1151
1001
proc = next_plugin;
1152
1002
1153
1003
/* We are done modifying process list, so unblock signal */
1154
ret = (int)(TEMP_FAILURE_RETRY
1155
(sigprocmask(SIG_UNBLOCK,
1156
&sigchld_action.sa_mask, NULL)));
1004
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1005
NULL);
1157
1006
if(ret < 0){
1158
error(0, errno, "sigprocmask");
1159
exitstatus = EX_OSERR;
1007
perror("sigprocmask");
1008
exitstatus = EXIT_FAILURE;
1160
1009
goto fallback;
1161
1010
}
1162
1011
1172
1021
bool bret = print_out_password(proc->buffer,
1173
1022
proc->buffer_length);
1174
1023
if(not bret){
1175
error(0, errno, "print_out_password");
1176
exitstatus = EX_IOERR;
1024
perror("print_out_password");
1025
exitstatus = EXIT_FAILURE;
1177
1026
}
1178
1027
goto fallback;
1179
1028
}
1180
1029
1181
1030
/* This process has not completed. Does it have any output? */
1182
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1183
warning from
1184
-Wconversion */
1031
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1185
1032
/* This process had nothing to say at this time */
1186
1033
proc = proc->next;
1187
1034
continue;
1191
1038
proc->buffer = realloc(proc->buffer, proc->buffer_size
1192
1039
+ (size_t) BUFFER_SIZE);
1193
1040
if(proc->buffer == NULL){
1194
error(0, errno, "malloc");
1195
exitstatus = EX_OSERR;
1041
perror("malloc");
1042
exitstatus = EXIT_FAILURE;
1196
1043
goto fallback;
1197
1044
}
1198
1045
proc->buffer_size += BUFFER_SIZE;
1199
1046
}
1200
1047
/* Read from the process */
1201
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1202
proc->buffer
1203
+ proc->buffer_length,
1204
BUFFER_SIZE));
1048
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1049
BUFFER_SIZE);
1205
1050
if(sret < 0){
1206
1051
/* Read error from this process; ignore the error */
1207
1052
proc = proc->next;
1219
1064
1220
1065
fallback:
1221
1066
1222
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1223
and exitstatus != EX_OK)){
1067
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1224
1068
/* Fallback if all plugins failed, none are found or an error
1225
1069
occured */
1226
1070
bool bret;
1234
1078
}
1235
1079
bret = print_out_password(passwordbuffer, len);
1236
1080
if(not bret){
1237
error(0, errno, "print_out_password");
1238
exitstatus = EX_IOERR;
1081
perror("print_out_password");
1082
exitstatus = EXIT_FAILURE;
1239
1083
}
1240
1084
}
1241
1085
1242
1086
/* Restore old signal handler */
1243
1087
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1244
1088
if(ret == -1){
1245
error(0, errno, "sigaction");
1246
exitstatus = EX_OSERR;
1089
perror("sigaction");
1090
exitstatus = EXIT_FAILURE;
1247
1091
}
1248
1092
1249
1093
if(custom_argv != NULL){
1264
1108
ret = kill(p->pid, SIGTERM);
1265
1109
if(ret == -1 and errno != ESRCH){
1266
1110
/* Set-uid proccesses might not get closed */
1267
error(0, errno, "kill");
1111
perror("kill");
1268
1112
}
1269
1113
}
1270
1114
}
1271
1115
1272
1116
/* Wait for any remaining child processes to terminate */
1273
do {
1117
do{
1274
1118
ret = wait(NULL);
1275
1119
} while(ret >= 0);
1276
1120
if(errno != ECHILD){
1277
error(0, errno, "wait");
1121
perror("wait");
1278
1122
}
1279
1123
1280
1124
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0