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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
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
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,
70
69
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
70
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
71
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
73
75
74
76
#define BUFFER_SIZE 256
75
77
77
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
78
80
79
81
const char *argp_program_version = "plugin-runner " VERSION;
80
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
81
83
82
84
typedef struct plugin{
83
85
char *name; /* can be NULL or any plugin name */
103
105
104
106
/* Gets an existing plugin based on name,
105
107
or if none is found, creates a new one */
108
__attribute__((warn_unused_result))
106
109
static plugin *getplugin(char *name){
107
110
/* Check for existing plugin with that name */
108
111
for(plugin *p = plugin_list; p != NULL; p = p->next){
169
172
}
170
173
171
174
/* Helper function for add_argument and add_environment */
175
__attribute__((nonnull, warn_unused_result))
172
176
static bool add_to_char_array(const char *new, char ***array,
173
177
int *len){
174
178
/* Resize the pointed-to array to hold one more pointer */
179
char **new_array = NULL;
175
180
do {
176
*array = realloc(*array, sizeof(char *)
177
* (size_t) ((*len) + 2));
178
} 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);
179
184
/* Malloc check */
180
if(*array == NULL){
185
if(new_array == NULL){
181
186
return false;
182
187
}
188
*array = new_array;
183
189
/* Make a copy of the new string */
184
190
char *copy;
185
191
do {
197
203
}
198
204
199
205
/* Add to a plugin's argument vector */
206
__attribute__((nonnull(2), warn_unused_result))
200
207
static bool add_argument(plugin *p, const char *arg){
201
208
if(p == NULL){
202
209
return false;
205
212
}
206
213
207
214
/* Add to a plugin's environment */
215
__attribute__((nonnull(2), warn_unused_result))
208
216
static bool add_environment(plugin *p, const char *def, bool replace){
209
217
if(p == NULL){
210
218
return false;
212
220
/* namelen = length of name of environment variable */
213
221
size_t namelen = (size_t)(strchrnul(def, '=') - def);
214
222
/* Search for this environment variable */
215
for(char **e = p->environ; *e != NULL; e++){
216
if(strncmp(*e, def, namelen + 1) == 0){
223
for(char **envdef = p->environ; *envdef != NULL; envdef++){
224
if(strncmp(*envdef, def, namelen + 1) == 0){
217
225
/* It already exists */
218
226
if(replace){
219
char *new;
227
char *new_envdef;
220
228
do {
221
new = realloc(*e, strlen(def) + 1);
222
} while(new == NULL and errno == EINTR);
223
if(new == NULL){
229
new_envdef = realloc(*envdef, strlen(def) + 1);
230
} while(new_envdef == NULL and errno == EINTR);
231
if(new_envdef == NULL){
224
232
return false;
225
233
}
226
*e = new;
227
strcpy(*e, def);
234
*envdef = new_envdef;
235
strcpy(*envdef, def);
228
236
}
229
237
return true;
230
238
}
232
240
return add_to_char_array(def, &(p->environ), &(p->envc));
233
241
}
234
242
243
#ifndef O_CLOEXEC
235
244
/*
236
245
* Based on the example in the GNU LibC manual chapter 13.13 "File
237
246
* Descriptor Flags".
238
247
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
239
248
*/
249
__attribute__((warn_unused_result))
240
250
static int set_cloexec_flag(int fd){
241
251
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
242
252
/* If reading the flags failed, return error indication now. */
247
257
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
248
258
ret | FD_CLOEXEC));
249
259
}
260
#endif /* not O_CLOEXEC */
250
261
251
262
252
263
/* Mark processes as completed when they exit, and save their exit
266
277
/* No child processes */
267
278
break;
268
279
}
269
perror("waitpid");
280
error(0, errno, "waitpid");
270
281
}
271
282
272
283
/* A child exited, find it in process_list */
284
295
}
285
296
286
297
/* Prints out a password to stdout */
298
__attribute__((nonnull, warn_unused_result))
287
299
static bool print_out_password(const char *buffer, size_t length){
288
300
ssize_t ret;
289
301
for(size_t written = 0; written < length; written += (size_t)ret){
297
309
}
298
310
299
311
/* Removes and free a plugin from the plugin list */
312
__attribute__((nonnull))
300
313
static void free_plugin(plugin *plugin_node){
301
314
302
315
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
336
349
char *plugindir = NULL;
337
350
char *argfile = NULL;
338
351
FILE *conffp;
339
size_t d_name_len;
340
DIR *dir = NULL;
341
struct dirent *dirst;
352
struct dirent **direntries = NULL;
342
353
struct stat st;
343
354
fd_set rfds_all;
344
355
int ret, maxfd = 0;
352
363
.sa_flags = SA_NOCLDSTOP };
353
364
char **custom_argv = NULL;
354
365
int custom_argc = 0;
366
int dir_fd = -1;
355
367
356
368
/* Establish a signal handler */
357
369
sigemptyset(&sigchld_action.sa_mask);
358
370
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
359
371
if(ret == -1){
360
perror("sigaddset");
372
error(0, errno, "sigaddset");
361
373
exitstatus = EX_OSERR;
362
374
goto fallback;
363
375
}
364
376
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
365
377
if(ret == -1){
366
perror("sigaction");
378
error(0, errno, "sigaction");
367
379
exitstatus = EX_OSERR;
368
380
goto fallback;
369
381
}
414
426
{ .name = NULL }
415
427
};
416
428
429
__attribute__((nonnull(3)))
417
430
error_t parse_opt(int key, char *arg, struct argp_state *state){
418
431
errno = 0;
419
432
switch(key){
420
433
char *tmp;
421
intmax_t tmpmax;
434
intmax_t tmp_id;
422
435
case 'g': /* --global-options */
423
436
{
424
437
char *plugin_option;
427
440
break;
428
441
}
429
442
}
443
errno = 0;
430
444
}
431
445
break;
432
446
case 'G': /* --global-env */
433
add_environment(getplugin(NULL), arg, true);
447
if(add_environment(getplugin(NULL), arg, true)){
448
errno = 0;
449
}
434
450
break;
435
451
case 'o': /* --options-for */
436
452
{
453
469
break;
454
470
}
455
471
}
472
errno = 0;
456
473
}
457
474
break;
458
475
case 'E': /* --env-for */
470
487
errno = EINVAL;
471
488
break;
472
489
}
473
add_environment(getplugin(arg), envdef, true);
490
if(add_environment(getplugin(arg), envdef, true)){
491
errno = 0;
492
}
474
493
}
475
494
break;
476
495
case 'd': /* --disable */
478
497
plugin *p = getplugin(arg);
479
498
if(p != NULL){
480
499
p->disabled = true;
500
errno = 0;
481
501
}
482
502
}
483
503
break;
486
506
plugin *p = getplugin(arg);
487
507
if(p != NULL){
488
508
p->disabled = false;
509
errno = 0;
489
510
}
490
511
}
491
512
break;
492
513
case 128: /* --plugin-dir */
493
514
free(plugindir);
494
515
plugindir = strdup(arg);
516
if(plugindir != NULL){
517
errno = 0;
518
}
495
519
break;
496
520
case 129: /* --config-file */
497
521
/* This is already done by parse_opt_config_file() */
498
522
break;
499
523
case 130: /* --userid */
500
tmpmax = strtoimax(arg, &tmp, 10);
524
tmp_id = strtoimax(arg, &tmp, 10);
501
525
if(errno != 0 or tmp == arg or *tmp != '\0'
502
or tmpmax != (uid_t)tmpmax){
526
or tmp_id != (uid_t)tmp_id){
503
527
argp_error(state, "Bad user ID number: \"%s\", using %"
504
528
PRIdMAX, arg, (intmax_t)uid);
505
529
break;
506
530
}
507
uid = (uid_t)tmpmax;
531
uid = (uid_t)tmp_id;
532
errno = 0;
508
533
break;
509
534
case 131: /* --groupid */
510
tmpmax = strtoimax(arg, &tmp, 10);
535
tmp_id = strtoimax(arg, &tmp, 10);
511
536
if(errno != 0 or tmp == arg or *tmp != '\0'
512
or tmpmax != (gid_t)tmpmax){
537
or tmp_id != (gid_t)tmp_id){
513
538
argp_error(state, "Bad group ID number: \"%s\", using %"
514
539
PRIdMAX, arg, (intmax_t)gid);
515
540
break;
516
541
}
517
gid = (gid_t)tmpmax;
542
gid = (gid_t)tmp_id;
543
errno = 0;
518
544
break;
519
545
case 132: /* --debug */
520
546
debug = true;
568
594
case 129: /* --config-file */
569
595
free(argfile);
570
596
argfile = strdup(arg);
597
if(argfile != NULL){
598
errno = 0;
599
}
571
600
break;
572
601
case 130: /* --userid */
573
602
case 131: /* --groupid */
599
628
case ENOMEM:
600
629
default:
601
630
errno = ret;
602
perror("argp_parse");
631
error(0, errno, "argp_parse");
603
632
exitstatus = EX_OSERR;
604
633
goto fallback;
605
634
case EINVAL:
626
655
custom_argc = 1;
627
656
custom_argv = malloc(sizeof(char*) * 2);
628
657
if(custom_argv == NULL){
629
perror("malloc");
658
error(0, errno, "malloc");
630
659
exitstatus = EX_OSERR;
631
660
goto fallback;
632
661
}
649
678
}
650
679
new_arg = strdup(p);
651
680
if(new_arg == NULL){
652
perror("strdup");
681
error(0, errno, "strdup");
653
682
exitstatus = EX_OSERR;
654
683
free(org_line);
655
684
goto fallback;
656
685
}
657
686
658
687
custom_argc += 1;
659
custom_argv = realloc(custom_argv, sizeof(char *)
660
* ((unsigned int) custom_argc + 1));
661
if(custom_argv == NULL){
662
perror("realloc");
663
exitstatus = EX_OSERR;
664
free(org_line);
665
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
}
666
701
}
667
702
custom_argv[custom_argc-1] = new_arg;
668
703
custom_argv[custom_argc] = NULL;
672
707
ret = fclose(conffp);
673
708
} while(ret == EOF and errno == EINTR);
674
709
if(ret == EOF){
675
perror("fclose");
710
error(0, errno, "fclose");
676
711
exitstatus = EX_IOERR;
677
712
goto fallback;
678
713
}
681
716
/* Check for harmful errors and go to fallback. Other errors might
682
717
not affect opening plugins */
683
718
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
684
perror("fopen");
719
error(0, errno, "fopen");
685
720
exitstatus = EX_OSERR;
686
721
goto fallback;
687
722
}
698
733
case ENOMEM:
699
734
default:
700
735
errno = ret;
701
perror("argp_parse");
736
error(0, errno, "argp_parse");
702
737
exitstatus = EX_OSERR;
703
738
goto fallback;
704
739
case EINVAL:
718
753
case ENOMEM:
719
754
default:
720
755
errno = ret;
721
perror("argp_parse");
756
error(0, errno, "argp_parse");
722
757
exitstatus = EX_OSERR;
723
758
goto fallback;
724
759
case EINVAL:
740
775
}
741
776
}
742
777
743
/* Strip permissions down to nobody */
744
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);
745
804
if(ret == -1){
746
perror("setgid");
805
error(0, errno, "setgid");
747
806
}
748
807
ret = setuid(uid);
749
808
if(ret == -1){
750
perror("setuid");
809
error(0, errno, "setuid");
751
810
}
752
811
753
812
/* Open plugin directory with close_on_exec flag */
754
813
{
755
int dir_fd = -1;
756
if(plugindir == NULL){
757
dir_fd = open(PDIR, O_RDONLY |
758
#ifdef O_CLOEXEC
759
O_CLOEXEC
760
#else /* not O_CLOEXEC */
761
0
762
#endif /* not O_CLOEXEC */
763
);
764
} else {
765
dir_fd = open(plugindir, O_RDONLY |
766
#ifdef O_CLOEXEC
767
O_CLOEXEC
768
#else /* not O_CLOEXEC */
769
0
770
#endif /* not O_CLOEXEC */
771
);
772
}
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
);
773
821
if(dir_fd == -1){
774
perror("Could not open plugin dir");
822
error(0, errno, "Could not open plugin dir");
775
823
exitstatus = EX_UNAVAILABLE;
776
824
goto fallback;
777
825
}
780
828
/* Set the FD_CLOEXEC flag on the directory */
781
829
ret = set_cloexec_flag(dir_fd);
782
830
if(ret < 0){
783
perror("set_cloexec_flag");
784
TEMP_FAILURE_RETRY(close(dir_fd));
831
error(0, errno, "set_cloexec_flag");
785
832
exitstatus = EX_OSERR;
786
833
goto fallback;
787
834
}
788
835
#endif /* O_CLOEXEC */
789
790
dir = fdopendir(dir_fd);
791
if(dir == NULL){
792
perror("Could not open plugin dir");
793
TEMP_FAILURE_RETRY(close(dir_fd));
794
exitstatus = EX_OSERR;
795
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
}
796
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;
797
880
}
798
881
799
882
FD_ZERO(&rfds_all);
800
883
801
884
/* Read and execute any executable in the plugin directory*/
802
while(true){
803
do {
804
dirst = readdir(dir);
805
} while(dirst == NULL and errno == EINTR);
806
807
/* All directory entries have been processed */
808
if(dirst == NULL){
809
if(errno == EBADF){
810
perror("readdir");
811
exitstatus = EX_IOERR;
812
goto fallback;
813
}
814
break;
815
}
816
817
d_name_len = strlen(dirst->d_name);
818
819
/* Ignore dotfiles, backup files and other junk */
820
{
821
bool bad_name = false;
822
823
const char const *bad_prefixes[] = { ".", "#", NULL };
824
825
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
826
".dpkg-old",
827
".dpkg-bak",
828
".dpkg-divert", NULL };
829
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
830
size_t pre_len = strlen(*pre);
831
if((d_name_len >= pre_len)
832
and strncmp((dirst->d_name), *pre, pre_len) == 0){
833
if(debug){
834
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
835
" with bad prefix %s\n", dirst->d_name, *pre);
836
}
837
bad_name = true;
838
break;
839
}
840
}
841
if(bad_name){
842
continue;
843
}
844
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
845
size_t suf_len = strlen(*suf);
846
if((d_name_len >= suf_len)
847
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
848
== 0)){
849
if(debug){
850
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
851
" with bad suffix %s\n", dirst->d_name, *suf);
852
}
853
bad_name = true;
854
break;
855
}
856
}
857
858
if(bad_name){
859
continue;
860
}
861
}
862
863
char *filename;
864
if(plugindir == NULL){
865
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
866
dirst->d_name));
867
} else {
868
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
869
plugindir,
870
dirst->d_name));
871
}
872
if(ret < 0){
873
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]);
874
891
continue;
875
892
}
876
877
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
893
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
878
894
if(ret == -1){
879
perror("stat");
880
free(filename);
895
error(0, errno, "stat");
896
TEMP_FAILURE_RETRY(close(plugin_fd));
897
free(direntries[i]);
881
898
continue;
882
899
}
883
900
884
901
/* Ignore non-executable files */
885
902
if(not S_ISREG(st.st_mode)
886
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)){
887
905
if(debug){
888
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
889
" 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);
890
910
}
891
free(filename);
911
TEMP_FAILURE_RETRY(close(plugin_fd));
912
free(direntries[i]);
892
913
continue;
893
914
}
894
915
895
plugin *p = getplugin(dirst->d_name);
916
plugin *p = getplugin(direntries[i]->d_name);
896
917
if(p == NULL){
897
perror("getplugin");
898
free(filename);
918
error(0, errno, "getplugin");
919
TEMP_FAILURE_RETRY(close(plugin_fd));
920
free(direntries[i]);
899
921
continue;
900
922
}
901
923
if(p->disabled){
902
924
if(debug){
903
925
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
904
dirst->d_name);
926
direntries[i]->d_name);
905
927
}
906
free(filename);
928
TEMP_FAILURE_RETRY(close(plugin_fd));
929
free(direntries[i]);
907
930
continue;
908
931
}
909
932
{
912
935
if(g != NULL){
913
936
for(char **a = g->argv + 1; *a != NULL; a++){
914
937
if(not add_argument(p, *a)){
915
perror("add_argument");
938
error(0, errno, "add_argument");
916
939
}
917
940
}
918
941
/* Add global environment variables */
919
942
for(char **e = g->environ; *e != NULL; e++){
920
943
if(not add_environment(p, *e, false)){
921
perror("add_environment");
944
error(0, errno, "add_environment");
922
945
}
923
946
}
924
947
}
925
948
}
926
/* If this plugin has any environment variables, we will call
927
using execve and need to duplicate the environment from this
928
process, too. */
949
/* If this plugin has any environment variables, we need to
950
duplicate the environment from this process, too. */
929
951
if(p->environ[0] != NULL){
930
952
for(char **e = environ; *e != NULL; e++){
931
953
if(not add_environment(p, *e, false)){
932
perror("add_environment");
954
error(0, errno, "add_environment");
933
955
}
934
956
}
935
957
}
936
958
937
959
int pipefd[2];
960
#ifndef O_CLOEXEC
938
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 */
939
965
if(ret == -1){
940
perror("pipe");
941
exitstatus = EX_OSERR;
942
goto fallback;
943
}
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
944
981
/* Ask OS to automatic close the pipe on exec */
945
982
ret = set_cloexec_flag(pipefd[0]);
946
983
if(ret < 0){
947
perror("set_cloexec_flag");
984
error(0, errno, "set_cloexec_flag");
985
TEMP_FAILURE_RETRY(close(pipefd[0]));
986
TEMP_FAILURE_RETRY(close(pipefd[1]));
948
987
exitstatus = EX_OSERR;
988
free(direntries[i]);
949
989
goto fallback;
950
990
}
951
991
ret = set_cloexec_flag(pipefd[1]);
952
992
if(ret < 0){
953
perror("set_cloexec_flag");
993
error(0, errno, "set_cloexec_flag");
994
TEMP_FAILURE_RETRY(close(pipefd[0]));
995
TEMP_FAILURE_RETRY(close(pipefd[1]));
954
996
exitstatus = EX_OSERR;
997
free(direntries[i]);
955
998
goto fallback;
956
999
}
1000
#endif /* not O_CLOEXEC */
957
1001
/* Block SIGCHLD until process is safely in process list */
958
1002
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
959
1003
&sigchld_action.sa_mask,
960
1004
NULL));
961
1005
if(ret < 0){
962
perror("sigprocmask");
1006
error(0, errno, "sigprocmask");
963
1007
exitstatus = EX_OSERR;
1008
free(direntries[i]);
964
1009
goto fallback;
965
1010
}
966
1011
/* Starting a new process to be watched */
969
1014
pid = fork();
970
1015
} while(pid == -1 and errno == EINTR);
971
1016
if(pid == -1){
972
perror("fork");
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]));
973
1022
exitstatus = EX_OSERR;
1023
free(direntries[i]);
974
1024
goto fallback;
975
1025
}
976
1026
if(pid == 0){
977
1027
/* this is the child process */
978
1028
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
979
1029
if(ret < 0){
980
perror("sigaction");
1030
error(0, errno, "sigaction");
981
1031
_exit(EX_OSERR);
982
1032
}
983
1033
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
984
1034
if(ret < 0){
985
perror("sigprocmask");
1035
error(0, errno, "sigprocmask");
986
1036
_exit(EX_OSERR);
987
1037
}
988
1038
989
1039
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
990
1040
if(ret == -1){
991
perror("dup2");
1041
error(0, errno, "dup2");
992
1042
_exit(EX_OSERR);
993
1043
}
994
1044
995
if(dirfd(dir) < 0){
996
/* If dir has no file descriptor, we could not set FD_CLOEXEC
997
above and must now close it manually here. */
998
closedir(dir);
999
}
1000
if(p->environ[0] == NULL){
1001
if(execv(filename, p->argv) < 0){
1002
perror("execv");
1003
_exit(EX_OSERR);
1004
}
1005
} else {
1006
if(execve(filename, p->argv, p->environ) < 0){
1007
perror("execve");
1008
_exit(EX_OSERR);
1009
}
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);
1010
1051
}
1011
1052
/* no return */
1012
1053
}
1013
1054
/* Parent process */
1014
1055
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1015
1056
pipe */
1016
free(filename);
1017
plugin *new_plugin = getplugin(dirst->d_name);
1057
TEMP_FAILURE_RETRY(close(plugin_fd));
1058
plugin *new_plugin = getplugin(direntries[i]->d_name);
1018
1059
if(new_plugin == NULL){
1019
perror("getplugin");
1060
error(0, errno, "getplugin");
1020
1061
ret = (int)(TEMP_FAILURE_RETRY
1021
1062
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1022
1063
NULL)));
1023
1064
if(ret < 0){
1024
perror("sigprocmask");
1065
error(0, errno, "sigprocmask");
1025
1066
}
1026
1067
exitstatus = EX_OSERR;
1068
free(direntries[i]);
1027
1069
goto fallback;
1028
1070
}
1071
free(direntries[i]);
1029
1072
1030
1073
new_plugin->pid = pid;
1031
1074
new_plugin->fd = pipefd[0];
1036
1079
&sigchld_action.sa_mask,
1037
1080
NULL));
1038
1081
if(ret < 0){
1039
perror("sigprocmask");
1082
error(0, errno, "sigprocmask");
1040
1083
exitstatus = EX_OSERR;
1041
1084
goto fallback;
1042
1085
}
1043
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
1044
1093
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1045
-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
1046
1101
1047
1102
if(maxfd < new_plugin->fd){
1048
1103
maxfd = new_plugin->fd;
1049
1104
}
1050
1105
}
1051
1106
1052
TEMP_FAILURE_RETRY(closedir(dir));
1053
dir = NULL;
1107
free(direntries);
1108
direntries = NULL;
1109
TEMP_FAILURE_RETRY(close(dir_fd));
1110
dir_fd = -1;
1054
1111
free_plugin(getplugin(NULL));
1055
1112
1056
1113
for(plugin *p = plugin_list; p != NULL; p = p->next){
1069
1126
fd_set rfds = rfds_all;
1070
1127
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1071
1128
if(select_ret == -1 and errno != EINTR){
1072
perror("select");
1129
error(0, errno, "select");
1073
1130
exitstatus = EX_OSERR;
1074
1131
goto fallback;
1075
1132
}
1102
1159
}
1103
1160
1104
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
1105
1168
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1106
-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
1107
1176
1108
1177
/* Block signal while modifying process_list */
1109
1178
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1111
1180
&sigchld_action.sa_mask,
1112
1181
NULL));
1113
1182
if(ret < 0){
1114
perror("sigprocmask");
1183
error(0, errno, "sigprocmask");
1115
1184
exitstatus = EX_OSERR;
1116
1185
goto fallback;
1117
1186
}
1125
1194
(sigprocmask(SIG_UNBLOCK,
1126
1195
&sigchld_action.sa_mask, NULL)));
1127
1196
if(ret < 0){
1128
perror("sigprocmask");
1197
error(0, errno, "sigprocmask");
1129
1198
exitstatus = EX_OSERR;
1130
1199
goto fallback;
1131
1200
}
1142
1211
bool bret = print_out_password(proc->buffer,
1143
1212
proc->buffer_length);
1144
1213
if(not bret){
1145
perror("print_out_password");
1214
error(0, errno, "print_out_password");
1146
1215
exitstatus = EX_IOERR;
1147
1216
}
1148
1217
goto fallback;
1149
1218
}
1150
1219
1151
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
1152
1227
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1153
1228
warning from
1154
-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
1155
1238
/* This process had nothing to say at this time */
1156
1239
proc = proc->next;
1157
1240
continue;
1158
1241
}
1159
1242
/* Before reading, make the process' data buffer large enough */
1160
1243
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1161
proc->buffer = realloc(proc->buffer, proc->buffer_size
1162
+ (size_t) BUFFER_SIZE);
1163
if(proc->buffer == NULL){
1164
perror("malloc");
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");
1165
1248
exitstatus = EX_OSERR;
1166
1249
goto fallback;
1167
1250
}
1251
proc->buffer = new_buffer;
1168
1252
proc->buffer_size += BUFFER_SIZE;
1169
1253
}
1170
1254
/* Read from the process */
1204
1288
}
1205
1289
bret = print_out_password(passwordbuffer, len);
1206
1290
if(not bret){
1207
perror("print_out_password");
1291
error(0, errno, "print_out_password");
1208
1292
exitstatus = EX_IOERR;
1209
1293
}
1210
1294
}
1212
1296
/* Restore old signal handler */
1213
1297
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1214
1298
if(ret == -1){
1215
perror("sigaction");
1299
error(0, errno, "sigaction");
1216
1300
exitstatus = EX_OSERR;
1217
1301
}
1218
1302
1223
1307
free(custom_argv);
1224
1308
}
1225
1309
1226
if(dir != NULL){
1227
closedir(dir);
1310
free(direntries);
1311
1312
if(dir_fd != -1){
1313
TEMP_FAILURE_RETRY(close(dir_fd));
1228
1314
}
1229
1315
1230
1316
/* Kill the processes */
1234
1320
ret = kill(p->pid, SIGTERM);
1235
1321
if(ret == -1 and errno != ESRCH){
1236
1322
/* Set-uid proccesses might not get closed */
1237
perror("kill");
1323
error(0, errno, "kill");
1238
1324
}
1239
1325
}
1240
1326
}
1244
1330
ret = wait(NULL);
1245
1331
} while(ret >= 0);
1246
1332
if(errno != ECHILD){
1247
perror("wait");
1333
error(0, errno, "wait");
1248
1334
}
1249
1335
1250
1336
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0