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- Committer: Teddy Hogeborn
- Date: 2014-08-09 23:37:07 UTC
- mto: (237.7.304 trunk)
- mto: This revision was merged to the branch mainline in revision 323.
- Revision ID: teddy@recompile.se-20140809233707-6c5qyievp78lnzf1
askpass-fifo: Lower privileges after opening FIFO.
* plugins.d/askpass-fifo.c (main): Lower privileges after opening FIFO.
* plugins.d/askpass-fifo.c (main): Lower privileges after opening FIFO.
- files added:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
5
* Copyright © 2008-2014 Teddy Hogeborn
6
* Copyright © 2008-2014 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(), O_CLOEXEC */
26
O_CLOEXEC, pipe2() */
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(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
34
stat, waitpid(), WIFEXITED(),
35
WEXITSTATUS(), wait(), pid_t,
36
uid_t, gid_t, getuid(), getgid(),
37
dirfd() */
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
34
WIFEXITED(), WEXITSTATUS(), wait(),
35
pid_t, uid_t, gid_t, getuid(),
36
getgid() */
38
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
38
FD_SET(), FD_ISSET(), FD_CLR */
40
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
40
WEXITSTATUS(), WTERMSIG(),
42
41
WCOREDUMP() */
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
44
43
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
46
readdir(), closedir(), dirfd() */
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
fcntl(), setuid(), setgid(),
49
F_GETFD, F_SETFD, FD_CLOEXEC,
50
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
52
execv(), write(), read(),
53
close() */
44
#include <dirent.h> /* struct dirent, scandirat() */
45
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
46
FD_CLOEXEC, write(), STDOUT_FILENO,
47
struct stat, fstat(), close(),
48
setgid(), setuid(), S_ISREG(),
49
faccessat() pipe2(), fork(),
50
_exit(), dup2(), fexecve(), read()
51
*/
54
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
58
57
#include <errno.h> /* errno */
59
58
#include <argp.h> /* struct argp_option, struct
60
59
argp_state, struct argp,
68
67
*/
69
68
#include <errno.h> /* errno, EBADF */
70
69
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE */
70
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
71
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
72
75
73
76
#define BUFFER_SIZE 256
74
77
76
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
77
80
78
81
const char *argp_program_version = "plugin-runner " VERSION;
79
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
80
83
81
84
typedef struct plugin{
82
85
char *name; /* can be NULL or any plugin name */
102
105
103
106
/* Gets an existing plugin based on name,
104
107
or if none is found, creates a new one */
108
__attribute__((warn_unused_result))
105
109
static plugin *getplugin(char *name){
106
110
/* Check for existing plugin with that name */
107
111
for(plugin *p = plugin_list; p != NULL; p = p->next){
168
172
}
169
173
170
174
/* Helper function for add_argument and add_environment */
175
__attribute__((nonnull, warn_unused_result))
171
176
static bool add_to_char_array(const char *new, char ***array,
172
177
int *len){
173
178
/* Resize the pointed-to array to hold one more pointer */
179
char **new_array = NULL;
174
180
do {
175
*array = realloc(*array, sizeof(char *)
176
* (size_t) ((*len) + 2));
177
} while(*array == NULL and errno == EINTR);
181
new_array = realloc(*array, sizeof(char *)
182
* (size_t) ((*len) + 2));
183
} while(new_array == NULL and errno == EINTR);
178
184
/* Malloc check */
179
if(*array == NULL){
185
if(new_array == NULL){
180
186
return false;
181
187
}
188
*array = new_array;
182
189
/* Make a copy of the new string */
183
190
char *copy;
184
191
do {
196
203
}
197
204
198
205
/* Add to a plugin's argument vector */
206
__attribute__((nonnull(2), warn_unused_result))
199
207
static bool add_argument(plugin *p, const char *arg){
200
208
if(p == NULL){
201
209
return false;
204
212
}
205
213
206
214
/* Add to a plugin's environment */
215
__attribute__((nonnull(2), warn_unused_result))
207
216
static bool add_environment(plugin *p, const char *def, bool replace){
208
217
if(p == NULL){
209
218
return false;
211
220
/* namelen = length of name of environment variable */
212
221
size_t namelen = (size_t)(strchrnul(def, '=') - def);
213
222
/* Search for this environment variable */
214
for(char **e = p->environ; *e != NULL; e++){
215
if(strncmp(*e, def, namelen + 1) == 0){
223
for(char **envdef = p->environ; *envdef != NULL; envdef++){
224
if(strncmp(*envdef, def, namelen + 1) == 0){
216
225
/* It already exists */
217
226
if(replace){
218
char *new;
227
char *new_envdef;
219
228
do {
220
new = realloc(*e, strlen(def) + 1);
221
} while(new == NULL and errno == EINTR);
222
if(new == NULL){
229
new_envdef = realloc(*envdef, strlen(def) + 1);
230
} while(new_envdef == NULL and errno == EINTR);
231
if(new_envdef == NULL){
223
232
return false;
224
233
}
225
*e = new;
226
strcpy(*e, def);
234
*envdef = new_envdef;
235
strcpy(*envdef, def);
227
236
}
228
237
return true;
229
238
}
231
240
return add_to_char_array(def, &(p->environ), &(p->envc));
232
241
}
233
242
243
#ifndef O_CLOEXEC
234
244
/*
235
245
* Based on the example in the GNU LibC manual chapter 13.13 "File
236
246
* Descriptor Flags".
237
247
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
238
248
*/
249
__attribute__((warn_unused_result))
239
250
static int set_cloexec_flag(int fd){
240
251
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
241
252
/* If reading the flags failed, return error indication now. */
246
257
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
247
258
ret | FD_CLOEXEC));
248
259
}
260
#endif /* not O_CLOEXEC */
249
261
250
262
251
263
/* Mark processes as completed when they exit, and save their exit
265
277
/* No child processes */
266
278
break;
267
279
}
268
perror("waitpid");
280
error(0, errno, "waitpid");
269
281
}
270
282
271
283
/* A child exited, find it in process_list */
283
295
}
284
296
285
297
/* Prints out a password to stdout */
298
__attribute__((nonnull, warn_unused_result))
286
299
static bool print_out_password(const char *buffer, size_t length){
287
300
ssize_t ret;
288
301
for(size_t written = 0; written < length; written += (size_t)ret){
296
309
}
297
310
298
311
/* Removes and free a plugin from the plugin list */
312
__attribute__((nonnull))
299
313
static void free_plugin(plugin *plugin_node){
300
314
301
315
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
335
349
char *plugindir = NULL;
336
350
char *argfile = NULL;
337
351
FILE *conffp;
338
size_t d_name_len;
339
DIR *dir = NULL;
340
struct dirent *dirst;
352
struct dirent **direntries = NULL;
341
353
struct stat st;
342
354
fd_set rfds_all;
343
355
int ret, maxfd = 0;
351
363
.sa_flags = SA_NOCLDSTOP };
352
364
char **custom_argv = NULL;
353
365
int custom_argc = 0;
366
int dir_fd = -1;
354
367
355
368
/* Establish a signal handler */
356
369
sigemptyset(&sigchld_action.sa_mask);
357
370
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
358
371
if(ret == -1){
359
perror("sigaddset");
360
exitstatus = EXIT_FAILURE;
372
error(0, errno, "sigaddset");
373
exitstatus = EX_OSERR;
361
374
goto fallback;
362
375
}
363
376
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
364
377
if(ret == -1){
365
perror("sigaction");
366
exitstatus = EXIT_FAILURE;
378
error(0, errno, "sigaction");
379
exitstatus = EX_OSERR;
367
380
goto fallback;
368
381
}
369
382
413
426
{ .name = NULL }
414
427
};
415
428
429
__attribute__((nonnull(3)))
416
430
error_t parse_opt(int key, char *arg, struct argp_state *state){
417
431
errno = 0;
418
432
switch(key){
419
433
char *tmp;
420
intmax_t tmpmax;
434
intmax_t tmp_id;
421
435
case 'g': /* --global-options */
422
436
{
423
437
char *plugin_option;
426
440
break;
427
441
}
428
442
}
443
errno = 0;
429
444
}
430
445
break;
431
446
case 'G': /* --global-env */
432
add_environment(getplugin(NULL), arg, true);
447
if(add_environment(getplugin(NULL), arg, true)){
448
errno = 0;
449
}
433
450
break;
434
451
case 'o': /* --options-for */
435
452
{
452
469
break;
453
470
}
454
471
}
472
errno = 0;
455
473
}
456
474
break;
457
475
case 'E': /* --env-for */
469
487
errno = EINVAL;
470
488
break;
471
489
}
472
add_environment(getplugin(arg), envdef, true);
490
if(add_environment(getplugin(arg), envdef, true)){
491
errno = 0;
492
}
473
493
}
474
494
break;
475
495
case 'd': /* --disable */
477
497
plugin *p = getplugin(arg);
478
498
if(p != NULL){
479
499
p->disabled = true;
500
errno = 0;
480
501
}
481
502
}
482
503
break;
485
506
plugin *p = getplugin(arg);
486
507
if(p != NULL){
487
508
p->disabled = false;
509
errno = 0;
488
510
}
489
511
}
490
512
break;
491
513
case 128: /* --plugin-dir */
492
514
free(plugindir);
493
515
plugindir = strdup(arg);
516
if(plugindir != NULL){
517
errno = 0;
518
}
494
519
break;
495
520
case 129: /* --config-file */
496
521
/* This is already done by parse_opt_config_file() */
497
522
break;
498
523
case 130: /* --userid */
499
tmpmax = strtoimax(arg, &tmp, 10);
524
tmp_id = strtoimax(arg, &tmp, 10);
500
525
if(errno != 0 or tmp == arg or *tmp != '\0'
501
or tmpmax != (uid_t)tmpmax){
526
or tmp_id != (uid_t)tmp_id){
502
527
argp_error(state, "Bad user ID number: \"%s\", using %"
503
528
PRIdMAX, arg, (intmax_t)uid);
504
529
break;
505
530
}
506
uid = (uid_t)tmpmax;
531
uid = (uid_t)tmp_id;
532
errno = 0;
507
533
break;
508
534
case 131: /* --groupid */
509
tmpmax = strtoimax(arg, &tmp, 10);
535
tmp_id = strtoimax(arg, &tmp, 10);
510
536
if(errno != 0 or tmp == arg or *tmp != '\0'
511
or tmpmax != (gid_t)tmpmax){
537
or tmp_id != (gid_t)tmp_id){
512
538
argp_error(state, "Bad group ID number: \"%s\", using %"
513
539
PRIdMAX, arg, (intmax_t)gid);
514
540
break;
515
541
}
516
gid = (gid_t)tmpmax;
542
gid = (gid_t)tmp_id;
543
errno = 0;
517
544
break;
518
545
case 132: /* --debug */
519
546
debug = true;
567
594
case 129: /* --config-file */
568
595
free(argfile);
569
596
argfile = strdup(arg);
597
if(argfile != NULL){
598
errno = 0;
599
}
570
600
break;
571
601
case 130: /* --userid */
572
602
case 131: /* --groupid */
598
628
case ENOMEM:
599
629
default:
600
630
errno = ret;
601
perror("argp_parse");
631
error(0, errno, "argp_parse");
602
632
exitstatus = EX_OSERR;
603
633
goto fallback;
604
634
case EINVAL:
625
655
custom_argc = 1;
626
656
custom_argv = malloc(sizeof(char*) * 2);
627
657
if(custom_argv == NULL){
628
perror("malloc");
629
exitstatus = EXIT_FAILURE;
658
error(0, errno, "malloc");
659
exitstatus = EX_OSERR;
630
660
goto fallback;
631
661
}
632
662
custom_argv[0] = argv[0];
648
678
}
649
679
new_arg = strdup(p);
650
680
if(new_arg == NULL){
651
perror("strdup");
652
exitstatus = EXIT_FAILURE;
681
error(0, errno, "strdup");
682
exitstatus = EX_OSERR;
653
683
free(org_line);
654
684
goto fallback;
655
685
}
656
686
657
687
custom_argc += 1;
658
custom_argv = realloc(custom_argv, sizeof(char *)
659
* ((unsigned int) custom_argc + 1));
660
if(custom_argv == NULL){
661
perror("realloc");
662
exitstatus = EXIT_FAILURE;
663
free(org_line);
664
goto fallback;
688
{
689
char **new_argv = realloc(custom_argv, sizeof(char *)
690
* ((unsigned int)
691
custom_argc + 1));
692
if(new_argv == NULL){
693
error(0, errno, "realloc");
694
exitstatus = EX_OSERR;
695
free(new_arg);
696
free(org_line);
697
goto fallback;
698
} else {
699
custom_argv = new_argv;
700
}
665
701
}
666
702
custom_argv[custom_argc-1] = new_arg;
667
703
custom_argv[custom_argc] = NULL;
671
707
ret = fclose(conffp);
672
708
} while(ret == EOF and errno == EINTR);
673
709
if(ret == EOF){
674
perror("fclose");
675
exitstatus = EXIT_FAILURE;
710
error(0, errno, "fclose");
711
exitstatus = EX_IOERR;
676
712
goto fallback;
677
713
}
678
714
free(org_line);
680
716
/* Check for harmful errors and go to fallback. Other errors might
681
717
not affect opening plugins */
682
718
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
683
perror("fopen");
684
exitstatus = EXIT_FAILURE;
719
error(0, errno, "fopen");
720
exitstatus = EX_OSERR;
685
721
goto fallback;
686
722
}
687
723
}
697
733
case ENOMEM:
698
734
default:
699
735
errno = ret;
700
perror("argp_parse");
736
error(0, errno, "argp_parse");
701
737
exitstatus = EX_OSERR;
702
738
goto fallback;
703
739
case EINVAL:
717
753
case ENOMEM:
718
754
default:
719
755
errno = ret;
720
perror("argp_parse");
756
error(0, errno, "argp_parse");
721
757
exitstatus = EX_OSERR;
722
758
goto fallback;
723
759
case EINVAL:
739
775
}
740
776
}
741
777
742
/* Strip permissions down to nobody */
743
setgid(gid);
778
if(getuid() == 0){
779
/* Work around Debian bug #633582:
780
<http://bugs.debian.org/633582> */
781
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
782
if(plugindir_fd == -1){
783
if(errno != ENOENT){
784
error(0, errno, "open(\"" PDIR "\")");
785
}
786
} else {
787
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
788
if(ret == -1){
789
error(0, errno, "fstat");
790
} else {
791
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
792
ret = fchown(plugindir_fd, uid, gid);
793
if(ret == -1){
794
error(0, errno, "fchown");
795
}
796
}
797
}
798
TEMP_FAILURE_RETRY(close(plugindir_fd));
799
}
800
}
801
802
/* Lower permissions */
803
ret = setgid(gid);
744
804
if(ret == -1){
745
perror("setgid");
805
error(0, errno, "setgid");
746
806
}
747
807
ret = setuid(uid);
748
808
if(ret == -1){
749
perror("setuid");
809
error(0, errno, "setuid");
750
810
}
751
811
752
812
/* Open plugin directory with close_on_exec flag */
753
813
{
754
int dir_fd = -1;
755
if(plugindir == NULL){
756
dir_fd = open(PDIR, O_RDONLY |
757
#ifdef O_CLOEXEC
758
O_CLOEXEC
759
#else /* not O_CLOEXEC */
760
0
761
#endif /* not O_CLOEXEC */
762
);
763
} else {
764
dir_fd = open(plugindir, O_RDONLY |
765
#ifdef O_CLOEXEC
766
O_CLOEXEC
767
#else /* not O_CLOEXEC */
768
0
769
#endif /* not O_CLOEXEC */
770
);
771
}
814
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
815
#ifdef O_CLOEXEC
816
O_CLOEXEC
817
#else /* not O_CLOEXEC */
818
0
819
#endif /* not O_CLOEXEC */
820
);
772
821
if(dir_fd == -1){
773
perror("Could not open plugin dir");
774
exitstatus = EXIT_FAILURE;
822
error(0, errno, "Could not open plugin dir");
823
exitstatus = EX_UNAVAILABLE;
775
824
goto fallback;
776
825
}
777
826
779
828
/* Set the FD_CLOEXEC flag on the directory */
780
829
ret = set_cloexec_flag(dir_fd);
781
830
if(ret < 0){
782
perror("set_cloexec_flag");
783
TEMP_FAILURE_RETRY(close(dir_fd));
784
exitstatus = EXIT_FAILURE;
831
error(0, errno, "set_cloexec_flag");
832
exitstatus = EX_OSERR;
785
833
goto fallback;
786
834
}
787
835
#endif /* O_CLOEXEC */
788
789
dir = fdopendir(dir_fd);
790
if(dir == NULL){
791
perror("Could not open plugin dir");
792
TEMP_FAILURE_RETRY(close(dir_fd));
793
exitstatus = EXIT_FAILURE;
794
goto fallback;
836
}
837
838
int good_name(const struct dirent * const dirent){
839
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
840
"*.dpkg-old", "*.dpkg-bak",
841
"*.dpkg-divert", NULL };
842
#ifdef __GNUC__
843
#pragma GCC diagnostic push
844
#pragma GCC diagnostic ignored "-Wcast-qual"
845
#endif
846
for(const char **pat = (const char **)patterns;
847
*pat != NULL; pat++){
848
#ifdef __GNUC__
849
#pragma GCC diagnostic pop
850
#endif
851
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
852
!= FNM_NOMATCH){
853
if(debug){
854
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
855
" matching pattern %s\n", dirent->d_name, *pat);
856
}
857
return 0;
858
}
795
859
}
860
return 1;
861
}
862
863
#ifdef __GLIBC__
864
#if __GLIBC_PREREQ(2, 15)
865
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
866
alphasort);
867
#else /* not __GLIBC_PREREQ(2, 15) */
868
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
869
&direntries, good_name, alphasort);
870
#endif /* not __GLIBC_PREREQ(2, 15) */
871
#else /* not __GLIBC__ */
872
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
873
&direntries, good_name, alphasort);
874
#endif /* not __GLIBC__ */
875
if(numplugins == -1){
876
error(0, errno, "Could not scan plugin dir");
877
direntries = NULL;
878
exitstatus = EX_OSERR;
879
goto fallback;
796
880
}
797
881
798
882
FD_ZERO(&rfds_all);
799
883
800
884
/* Read and execute any executable in the plugin directory*/
801
while(true){
802
do {
803
dirst = readdir(dir);
804
} while(dirst == NULL and errno == EINTR);
805
806
/* All directory entries have been processed */
807
if(dirst == NULL){
808
if(errno == EBADF){
809
perror("readdir");
810
exitstatus = EXIT_FAILURE;
811
goto fallback;
812
}
813
break;
814
}
815
816
d_name_len = strlen(dirst->d_name);
817
818
/* Ignore dotfiles, backup files and other junk */
819
{
820
bool bad_name = false;
821
822
const char const *bad_prefixes[] = { ".", "#", NULL };
823
824
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
825
".dpkg-old",
826
".dpkg-bak",
827
".dpkg-divert", NULL };
828
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
829
size_t pre_len = strlen(*pre);
830
if((d_name_len >= pre_len)
831
and strncmp((dirst->d_name), *pre, pre_len) == 0){
832
if(debug){
833
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
834
" with bad prefix %s\n", dirst->d_name, *pre);
835
}
836
bad_name = true;
837
break;
838
}
839
}
840
if(bad_name){
841
continue;
842
}
843
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
844
size_t suf_len = strlen(*suf);
845
if((d_name_len >= suf_len)
846
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
847
== 0)){
848
if(debug){
849
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
850
" with bad suffix %s\n", dirst->d_name, *suf);
851
}
852
bad_name = true;
853
break;
854
}
855
}
856
857
if(bad_name){
858
continue;
859
}
860
}
861
862
char *filename;
863
if(plugindir == NULL){
864
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
865
dirst->d_name));
866
} else {
867
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
868
plugindir,
869
dirst->d_name));
870
}
871
if(ret < 0){
872
perror("asprintf");
885
for(int i = 0; i < numplugins; i++){
886
887
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
888
if(plugin_fd == -1){
889
error(0, errno, "Could not open plugin");
890
free(direntries[i]);
873
891
continue;
874
892
}
875
876
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
893
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
877
894
if(ret == -1){
878
perror("stat");
879
free(filename);
895
error(0, errno, "stat");
896
TEMP_FAILURE_RETRY(close(plugin_fd));
897
free(direntries[i]);
880
898
continue;
881
899
}
882
900
883
901
/* Ignore non-executable files */
884
902
if(not S_ISREG(st.st_mode)
885
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
903
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
904
X_OK, 0)) != 0)){
886
905
if(debug){
887
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
888
" with bad type or mode\n", filename);
906
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
907
" with bad type or mode\n",
908
plugindir != NULL ? plugindir : PDIR,
909
direntries[i]->d_name);
889
910
}
890
free(filename);
911
TEMP_FAILURE_RETRY(close(plugin_fd));
912
free(direntries[i]);
891
913
continue;
892
914
}
893
915
894
plugin *p = getplugin(dirst->d_name);
916
plugin *p = getplugin(direntries[i]->d_name);
895
917
if(p == NULL){
896
perror("getplugin");
897
free(filename);
918
error(0, errno, "getplugin");
919
TEMP_FAILURE_RETRY(close(plugin_fd));
920
free(direntries[i]);
898
921
continue;
899
922
}
900
923
if(p->disabled){
901
924
if(debug){
902
925
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
903
dirst->d_name);
926
direntries[i]->d_name);
904
927
}
905
free(filename);
928
TEMP_FAILURE_RETRY(close(plugin_fd));
929
free(direntries[i]);
906
930
continue;
907
931
}
908
932
{
911
935
if(g != NULL){
912
936
for(char **a = g->argv + 1; *a != NULL; a++){
913
937
if(not add_argument(p, *a)){
914
perror("add_argument");
938
error(0, errno, "add_argument");
915
939
}
916
940
}
917
941
/* Add global environment variables */
918
942
for(char **e = g->environ; *e != NULL; e++){
919
943
if(not add_environment(p, *e, false)){
920
perror("add_environment");
944
error(0, errno, "add_environment");
921
945
}
922
946
}
923
947
}
924
948
}
925
/* If this plugin has any environment variables, we will call
926
using execve and need to duplicate the environment from this
927
process, too. */
949
/* If this plugin has any environment variables, we need to
950
duplicate the environment from this process, too. */
928
951
if(p->environ[0] != NULL){
929
952
for(char **e = environ; *e != NULL; e++){
930
953
if(not add_environment(p, *e, false)){
931
perror("add_environment");
954
error(0, errno, "add_environment");
932
955
}
933
956
}
934
957
}
935
958
936
959
int pipefd[2];
960
#ifndef O_CLOEXEC
937
961
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
962
#else /* O_CLOEXEC */
963
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
964
#endif /* O_CLOEXEC */
938
965
if(ret == -1){
939
perror("pipe");
940
exitstatus = EXIT_FAILURE;
941
goto fallback;
942
}
966
error(0, errno, "pipe");
967
exitstatus = EX_OSERR;
968
free(direntries[i]);
969
goto fallback;
970
}
971
if(pipefd[0] >= FD_SETSIZE){
972
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
973
FD_SETSIZE);
974
TEMP_FAILURE_RETRY(close(pipefd[0]));
975
TEMP_FAILURE_RETRY(close(pipefd[1]));
976
exitstatus = EX_OSERR;
977
free(direntries[i]);
978
goto fallback;
979
}
980
#ifndef O_CLOEXEC
943
981
/* Ask OS to automatic close the pipe on exec */
944
982
ret = set_cloexec_flag(pipefd[0]);
945
983
if(ret < 0){
946
perror("set_cloexec_flag");
947
exitstatus = EXIT_FAILURE;
984
error(0, errno, "set_cloexec_flag");
985
TEMP_FAILURE_RETRY(close(pipefd[0]));
986
TEMP_FAILURE_RETRY(close(pipefd[1]));
987
exitstatus = EX_OSERR;
988
free(direntries[i]);
948
989
goto fallback;
949
990
}
950
991
ret = set_cloexec_flag(pipefd[1]);
951
992
if(ret < 0){
952
perror("set_cloexec_flag");
953
exitstatus = EXIT_FAILURE;
993
error(0, errno, "set_cloexec_flag");
994
TEMP_FAILURE_RETRY(close(pipefd[0]));
995
TEMP_FAILURE_RETRY(close(pipefd[1]));
996
exitstatus = EX_OSERR;
997
free(direntries[i]);
954
998
goto fallback;
955
999
}
1000
#endif /* not O_CLOEXEC */
956
1001
/* Block SIGCHLD until process is safely in process list */
957
1002
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
958
1003
&sigchld_action.sa_mask,
959
1004
NULL));
960
1005
if(ret < 0){
961
perror("sigprocmask");
962
exitstatus = EXIT_FAILURE;
1006
error(0, errno, "sigprocmask");
1007
exitstatus = EX_OSERR;
1008
free(direntries[i]);
963
1009
goto fallback;
964
1010
}
965
1011
/* Starting a new process to be watched */
968
1014
pid = fork();
969
1015
} while(pid == -1 and errno == EINTR);
970
1016
if(pid == -1){
971
perror("fork");
972
exitstatus = EXIT_FAILURE;
1017
error(0, errno, "fork");
1018
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1019
&sigchld_action.sa_mask, NULL));
1020
TEMP_FAILURE_RETRY(close(pipefd[0]));
1021
TEMP_FAILURE_RETRY(close(pipefd[1]));
1022
exitstatus = EX_OSERR;
1023
free(direntries[i]);
973
1024
goto fallback;
974
1025
}
975
1026
if(pid == 0){
976
1027
/* this is the child process */
977
1028
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
978
1029
if(ret < 0){
979
perror("sigaction");
980
_exit(EXIT_FAILURE);
1030
error(0, errno, "sigaction");
1031
_exit(EX_OSERR);
981
1032
}
982
1033
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
983
1034
if(ret < 0){
984
perror("sigprocmask");
985
_exit(EXIT_FAILURE);
1035
error(0, errno, "sigprocmask");
1036
_exit(EX_OSERR);
986
1037
}
987
1038
988
1039
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
989
1040
if(ret == -1){
990
perror("dup2");
991
_exit(EXIT_FAILURE);
1041
error(0, errno, "dup2");
1042
_exit(EX_OSERR);
992
1043
}
993
1044
994
if(dirfd(dir) < 0){
995
/* If dir has no file descriptor, we could not set FD_CLOEXEC
996
above and must now close it manually here. */
997
closedir(dir);
998
}
999
if(p->environ[0] == NULL){
1000
if(execv(filename, p->argv) < 0){
1001
perror("execv");
1002
_exit(EXIT_FAILURE);
1003
}
1004
} else {
1005
if(execve(filename, p->argv, p->environ) < 0){
1006
perror("execve");
1007
_exit(EXIT_FAILURE);
1008
}
1045
if(fexecve(plugin_fd, p->argv,
1046
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1047
error(0, errno, "fexecve for %s/%s",
1048
plugindir != NULL ? plugindir : PDIR,
1049
direntries[i]->d_name);
1050
_exit(EX_OSERR);
1009
1051
}
1010
1052
/* no return */
1011
1053
}
1012
1054
/* Parent process */
1013
1055
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1014
1056
pipe */
1015
free(filename);
1016
plugin *new_plugin = getplugin(dirst->d_name);
1057
TEMP_FAILURE_RETRY(close(plugin_fd));
1058
plugin *new_plugin = getplugin(direntries[i]->d_name);
1017
1059
if(new_plugin == NULL){
1018
perror("getplugin");
1060
error(0, errno, "getplugin");
1019
1061
ret = (int)(TEMP_FAILURE_RETRY
1020
1062
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1021
1063
NULL)));
1022
1064
if(ret < 0){
1023
perror("sigprocmask");
1065
error(0, errno, "sigprocmask");
1024
1066
}
1025
exitstatus = EXIT_FAILURE;
1067
exitstatus = EX_OSERR;
1068
free(direntries[i]);
1026
1069
goto fallback;
1027
1070
}
1071
free(direntries[i]);
1028
1072
1029
1073
new_plugin->pid = pid;
1030
1074
new_plugin->fd = pipefd[0];
1035
1079
&sigchld_action.sa_mask,
1036
1080
NULL));
1037
1081
if(ret < 0){
1038
perror("sigprocmask");
1039
exitstatus = EXIT_FAILURE;
1082
error(0, errno, "sigprocmask");
1083
exitstatus = EX_OSERR;
1040
1084
goto fallback;
1041
1085
}
1042
1086
1087
#if defined (__GNUC__) and defined (__GLIBC__)
1088
#if not __GLIBC_PREREQ(2, 16)
1089
#pragma GCC diagnostic push
1090
#pragma GCC diagnostic ignored "-Wsign-conversion"
1091
#endif
1092
#endif
1043
1093
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1044
-Wconversion */
1094
-Wconversion in GNU libc
1095
before 2.16 */
1096
#if defined (__GNUC__) and defined (__GLIBC__)
1097
#if not __GLIBC_PREREQ(2, 16)
1098
#pragma GCC diagnostic pop
1099
#endif
1100
#endif
1045
1101
1046
1102
if(maxfd < new_plugin->fd){
1047
1103
maxfd = new_plugin->fd;
1048
1104
}
1049
1105
}
1050
1106
1051
TEMP_FAILURE_RETRY(closedir(dir));
1052
dir = NULL;
1107
free(direntries);
1108
direntries = NULL;
1109
TEMP_FAILURE_RETRY(close(dir_fd));
1110
dir_fd = -1;
1053
1111
free_plugin(getplugin(NULL));
1054
1112
1055
1113
for(plugin *p = plugin_list; p != NULL; p = p->next){
1068
1126
fd_set rfds = rfds_all;
1069
1127
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1070
1128
if(select_ret == -1 and errno != EINTR){
1071
perror("select");
1072
exitstatus = EXIT_FAILURE;
1129
error(0, errno, "select");
1130
exitstatus = EX_OSERR;
1073
1131
goto fallback;
1074
1132
}
1075
1133
/* OK, now either a process completed, or something can be read
1101
1159
}
1102
1160
1103
1161
/* Remove the plugin */
1162
#if defined (__GNUC__) and defined (__GLIBC__)
1163
#if not __GLIBC_PREREQ(2, 16)
1164
#pragma GCC diagnostic push
1165
#pragma GCC diagnostic ignored "-Wsign-conversion"
1166
#endif
1167
#endif
1104
1168
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1105
-Wconversion */
1169
-Wconversion in GNU libc
1170
before 2.16 */
1171
#if defined (__GNUC__) and defined (__GLIBC__)
1172
#if not __GLIBC_PREREQ(2, 16)
1173
#pragma GCC diagnostic pop
1174
#endif
1175
#endif
1106
1176
1107
1177
/* Block signal while modifying process_list */
1108
1178
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1110
1180
&sigchld_action.sa_mask,
1111
1181
NULL));
1112
1182
if(ret < 0){
1113
perror("sigprocmask");
1114
exitstatus = EXIT_FAILURE;
1183
error(0, errno, "sigprocmask");
1184
exitstatus = EX_OSERR;
1115
1185
goto fallback;
1116
1186
}
1117
1187
1124
1194
(sigprocmask(SIG_UNBLOCK,
1125
1195
&sigchld_action.sa_mask, NULL)));
1126
1196
if(ret < 0){
1127
perror("sigprocmask");
1128
exitstatus = EXIT_FAILURE;
1197
error(0, errno, "sigprocmask");
1198
exitstatus = EX_OSERR;
1129
1199
goto fallback;
1130
1200
}
1131
1201
1141
1211
bool bret = print_out_password(proc->buffer,
1142
1212
proc->buffer_length);
1143
1213
if(not bret){
1144
perror("print_out_password");
1145
exitstatus = EXIT_FAILURE;
1214
error(0, errno, "print_out_password");
1215
exitstatus = EX_IOERR;
1146
1216
}
1147
1217
goto fallback;
1148
1218
}
1149
1219
1150
1220
/* This process has not completed. Does it have any output? */
1221
#if defined (__GNUC__) and defined (__GLIBC__)
1222
#if not __GLIBC_PREREQ(2, 16)
1223
#pragma GCC diagnostic push
1224
#pragma GCC diagnostic ignored "-Wsign-conversion"
1225
#endif
1226
#endif
1151
1227
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1152
1228
warning from
1153
-Wconversion */
1229
-Wconversion
1230
in GNU libc
1231
before
1232
2.16 */
1233
#if defined (__GNUC__) and defined (__GLIBC__)
1234
#if not __GLIBC_PREREQ(2, 16)
1235
#pragma GCC diagnostic pop
1236
#endif
1237
#endif
1154
1238
/* This process had nothing to say at this time */
1155
1239
proc = proc->next;
1156
1240
continue;
1157
1241
}
1158
1242
/* Before reading, make the process' data buffer large enough */
1159
1243
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1160
proc->buffer = realloc(proc->buffer, proc->buffer_size
1161
+ (size_t) BUFFER_SIZE);
1162
if(proc->buffer == NULL){
1163
perror("malloc");
1164
exitstatus = EXIT_FAILURE;
1244
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1245
+ (size_t) BUFFER_SIZE);
1246
if(new_buffer == NULL){
1247
error(0, errno, "malloc");
1248
exitstatus = EX_OSERR;
1165
1249
goto fallback;
1166
1250
}
1251
proc->buffer = new_buffer;
1167
1252
proc->buffer_size += BUFFER_SIZE;
1168
1253
}
1169
1254
/* Read from the process */
1188
1273
1189
1274
fallback:
1190
1275
1191
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1276
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1277
and exitstatus != EX_OK)){
1192
1278
/* Fallback if all plugins failed, none are found or an error
1193
1279
occured */
1194
1280
bool bret;
1202
1288
}
1203
1289
bret = print_out_password(passwordbuffer, len);
1204
1290
if(not bret){
1205
perror("print_out_password");
1206
exitstatus = EXIT_FAILURE;
1291
error(0, errno, "print_out_password");
1292
exitstatus = EX_IOERR;
1207
1293
}
1208
1294
}
1209
1295
1210
1296
/* Restore old signal handler */
1211
1297
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1212
1298
if(ret == -1){
1213
perror("sigaction");
1214
exitstatus = EXIT_FAILURE;
1299
error(0, errno, "sigaction");
1300
exitstatus = EX_OSERR;
1215
1301
}
1216
1302
1217
1303
if(custom_argv != NULL){
1221
1307
free(custom_argv);
1222
1308
}
1223
1309
1224
if(dir != NULL){
1225
closedir(dir);
1310
free(direntries);
1311
1312
if(dir_fd != -1){
1313
TEMP_FAILURE_RETRY(close(dir_fd));
1226
1314
}
1227
1315
1228
1316
/* Kill the processes */
1232
1320
ret = kill(p->pid, SIGTERM);
1233
1321
if(ret == -1 and errno != ESRCH){
1234
1322
/* Set-uid proccesses might not get closed */
1235
perror("kill");
1323
error(0, errno, "kill");
1236
1324
}
1237
1325
}
1238
1326
}
1242
1330
ret = wait(NULL);
1243
1331
} while(ret >= 0);
1244
1332
if(errno != ECHILD){
1245
perror("wait");
1333
error(0, errno, "wait");
1246
1334
}
1247
1335
1248
1336
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0