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- Committer: teddy at bsnet
- Date: 2010-09-08 19:25:13 UTC
- Revision ID: teddy@fukt.bsnet.se-20100908192513-ccso0jpam3qg4yze
* TODO: Clarifications.
- files removed:
- 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 © 2008-2014 Teddy Hogeborn
6
* Copyright © 2008-2014 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
O_CLOEXEC, pipe2() */
26
asprintf(), O_CLOEXEC */
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> /* 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() */
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() */
37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
41
WEXITSTATUS(), WTERMSIG(),
41
42
WCOREDUMP() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
44
#include <iso646.h> /* and, or, not */
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
*/
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() */
52
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
55
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
57
58
#include <errno.h> /* errno */
58
59
#include <argp.h> /* struct argp_option, struct
59
60
argp_state, struct argp,
69
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
70
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
71
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
75
73
76
74
#define BUFFER_SIZE 256
77
75
79
77
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
78
81
79
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
80
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
83
81
84
82
typedef struct plugin{
85
83
char *name; /* can be NULL or any plugin name */
105
103
106
104
/* Gets an existing plugin based on name,
107
105
or if none is found, creates a new one */
108
__attribute__((warn_unused_result))
109
106
static plugin *getplugin(char *name){
110
107
/* Check for existing plugin with that name */
111
108
for(plugin *p = plugin_list; p != NULL; p = p->next){
172
169
}
173
170
174
171
/* Helper function for add_argument and add_environment */
175
__attribute__((nonnull, warn_unused_result))
176
172
static bool add_to_char_array(const char *new, char ***array,
177
173
int *len){
178
174
/* Resize the pointed-to array to hold one more pointer */
179
char **new_array = NULL;
180
175
do {
181
new_array = realloc(*array, sizeof(char *)
182
* (size_t) ((*len) + 2));
183
} while(new_array == NULL and errno == EINTR);
176
*array = realloc(*array, sizeof(char *)
177
* (size_t) ((*len) + 2));
178
} while(*array == NULL and errno == EINTR);
184
179
/* Malloc check */
185
if(new_array == NULL){
180
if(*array == NULL){
186
181
return false;
187
182
}
188
*array = new_array;
189
183
/* Make a copy of the new string */
190
184
char *copy;
191
185
do {
203
197
}
204
198
205
199
/* Add to a plugin's argument vector */
206
__attribute__((nonnull(2), warn_unused_result))
207
200
static bool add_argument(plugin *p, const char *arg){
208
201
if(p == NULL){
209
202
return false;
212
205
}
213
206
214
207
/* Add to a plugin's environment */
215
__attribute__((nonnull(2), warn_unused_result))
216
208
static bool add_environment(plugin *p, const char *def, bool replace){
217
209
if(p == NULL){
218
210
return false;
220
212
/* namelen = length of name of environment variable */
221
213
size_t namelen = (size_t)(strchrnul(def, '=') - def);
222
214
/* Search for this environment variable */
223
for(char **envdef = p->environ; *envdef != NULL; envdef++){
224
if(strncmp(*envdef, def, namelen + 1) == 0){
215
for(char **e = p->environ; *e != NULL; e++){
216
if(strncmp(*e, def, namelen + 1) == 0){
225
217
/* It already exists */
226
218
if(replace){
227
char *new_envdef;
219
char *new;
228
220
do {
229
new_envdef = realloc(*envdef, strlen(def) + 1);
230
} while(new_envdef == NULL and errno == EINTR);
231
if(new_envdef == NULL){
221
new = realloc(*e, strlen(def) + 1);
222
} while(new == NULL and errno == EINTR);
223
if(new == NULL){
232
224
return false;
233
225
}
234
*envdef = new_envdef;
235
strcpy(*envdef, def);
226
*e = new;
227
strcpy(*e, def);
236
228
}
237
229
return true;
238
230
}
240
232
return add_to_char_array(def, &(p->environ), &(p->envc));
241
233
}
242
234
243
#ifndef O_CLOEXEC
244
235
/*
245
236
* Based on the example in the GNU LibC manual chapter 13.13 "File
246
237
* Descriptor Flags".
247
238
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
248
239
*/
249
__attribute__((warn_unused_result))
250
240
static int set_cloexec_flag(int fd){
251
241
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
252
242
/* If reading the flags failed, return error indication now. */
257
247
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
258
248
ret | FD_CLOEXEC));
259
249
}
260
#endif /* not O_CLOEXEC */
261
250
262
251
263
252
/* Mark processes as completed when they exit, and save their exit
277
266
/* No child processes */
278
267
break;
279
268
}
280
error(0, errno, "waitpid");
269
perror("waitpid");
281
270
}
282
271
283
272
/* A child exited, find it in process_list */
295
284
}
296
285
297
286
/* Prints out a password to stdout */
298
__attribute__((nonnull, warn_unused_result))
299
287
static bool print_out_password(const char *buffer, size_t length){
300
288
ssize_t ret;
301
289
for(size_t written = 0; written < length; written += (size_t)ret){
309
297
}
310
298
311
299
/* Removes and free a plugin from the plugin list */
312
__attribute__((nonnull))
313
300
static void free_plugin(plugin *plugin_node){
314
301
315
302
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
349
336
char *plugindir = NULL;
350
337
char *argfile = NULL;
351
338
FILE *conffp;
352
struct dirent **direntries = NULL;
339
size_t d_name_len;
340
DIR *dir = NULL;
341
struct dirent *dirst;
353
342
struct stat st;
354
343
fd_set rfds_all;
355
344
int ret, maxfd = 0;
363
352
.sa_flags = SA_NOCLDSTOP };
364
353
char **custom_argv = NULL;
365
354
int custom_argc = 0;
366
int dir_fd = -1;
367
355
368
356
/* Establish a signal handler */
369
357
sigemptyset(&sigchld_action.sa_mask);
370
358
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
371
359
if(ret == -1){
372
error(0, errno, "sigaddset");
360
perror("sigaddset");
373
361
exitstatus = EX_OSERR;
374
362
goto fallback;
375
363
}
376
364
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
377
365
if(ret == -1){
378
error(0, errno, "sigaction");
366
perror("sigaction");
379
367
exitstatus = EX_OSERR;
380
368
goto fallback;
381
369
}
426
414
{ .name = NULL }
427
415
};
428
416
429
__attribute__((nonnull(3)))
430
417
error_t parse_opt(int key, char *arg, struct argp_state *state){
431
418
errno = 0;
432
419
switch(key){
433
420
char *tmp;
434
intmax_t tmp_id;
421
intmax_t tmpmax;
435
422
case 'g': /* --global-options */
436
423
{
437
424
char *plugin_option;
440
427
break;
441
428
}
442
429
}
443
errno = 0;
444
430
}
445
431
break;
446
432
case 'G': /* --global-env */
447
if(add_environment(getplugin(NULL), arg, true)){
448
errno = 0;
449
}
433
add_environment(getplugin(NULL), arg, true);
450
434
break;
451
435
case 'o': /* --options-for */
452
436
{
469
453
break;
470
454
}
471
455
}
472
errno = 0;
473
456
}
474
457
break;
475
458
case 'E': /* --env-for */
487
470
errno = EINVAL;
488
471
break;
489
472
}
490
if(add_environment(getplugin(arg), envdef, true)){
491
errno = 0;
492
}
473
add_environment(getplugin(arg), envdef, true);
493
474
}
494
475
break;
495
476
case 'd': /* --disable */
497
478
plugin *p = getplugin(arg);
498
479
if(p != NULL){
499
480
p->disabled = true;
500
errno = 0;
501
481
}
502
482
}
503
483
break;
506
486
plugin *p = getplugin(arg);
507
487
if(p != NULL){
508
488
p->disabled = false;
509
errno = 0;
510
489
}
511
490
}
512
491
break;
513
492
case 128: /* --plugin-dir */
514
493
free(plugindir);
515
494
plugindir = strdup(arg);
516
if(plugindir != NULL){
517
errno = 0;
518
}
519
495
break;
520
496
case 129: /* --config-file */
521
497
/* This is already done by parse_opt_config_file() */
522
498
break;
523
499
case 130: /* --userid */
524
tmp_id = strtoimax(arg, &tmp, 10);
500
tmpmax = strtoimax(arg, &tmp, 10);
525
501
if(errno != 0 or tmp == arg or *tmp != '\0'
526
or tmp_id != (uid_t)tmp_id){
502
or tmpmax != (uid_t)tmpmax){
527
503
argp_error(state, "Bad user ID number: \"%s\", using %"
528
504
PRIdMAX, arg, (intmax_t)uid);
529
505
break;
530
506
}
531
uid = (uid_t)tmp_id;
532
errno = 0;
507
uid = (uid_t)tmpmax;
533
508
break;
534
509
case 131: /* --groupid */
535
tmp_id = strtoimax(arg, &tmp, 10);
510
tmpmax = strtoimax(arg, &tmp, 10);
536
511
if(errno != 0 or tmp == arg or *tmp != '\0'
537
or tmp_id != (gid_t)tmp_id){
512
or tmpmax != (gid_t)tmpmax){
538
513
argp_error(state, "Bad group ID number: \"%s\", using %"
539
514
PRIdMAX, arg, (intmax_t)gid);
540
515
break;
541
516
}
542
gid = (gid_t)tmp_id;
543
errno = 0;
517
gid = (gid_t)tmpmax;
544
518
break;
545
519
case 132: /* --debug */
546
520
debug = true;
594
568
case 129: /* --config-file */
595
569
free(argfile);
596
570
argfile = strdup(arg);
597
if(argfile != NULL){
598
errno = 0;
599
}
600
571
break;
601
572
case 130: /* --userid */
602
573
case 131: /* --groupid */
628
599
case ENOMEM:
629
600
default:
630
601
errno = ret;
631
error(0, errno, "argp_parse");
602
perror("argp_parse");
632
603
exitstatus = EX_OSERR;
633
604
goto fallback;
634
605
case EINVAL:
655
626
custom_argc = 1;
656
627
custom_argv = malloc(sizeof(char*) * 2);
657
628
if(custom_argv == NULL){
658
error(0, errno, "malloc");
629
perror("malloc");
659
630
exitstatus = EX_OSERR;
660
631
goto fallback;
661
632
}
678
649
}
679
650
new_arg = strdup(p);
680
651
if(new_arg == NULL){
681
error(0, errno, "strdup");
652
perror("strdup");
682
653
exitstatus = EX_OSERR;
683
654
free(org_line);
684
655
goto fallback;
685
656
}
686
657
687
658
custom_argc += 1;
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
}
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;
701
666
}
702
667
custom_argv[custom_argc-1] = new_arg;
703
668
custom_argv[custom_argc] = NULL;
707
672
ret = fclose(conffp);
708
673
} while(ret == EOF and errno == EINTR);
709
674
if(ret == EOF){
710
error(0, errno, "fclose");
675
perror("fclose");
711
676
exitstatus = EX_IOERR;
712
677
goto fallback;
713
678
}
716
681
/* Check for harmful errors and go to fallback. Other errors might
717
682
not affect opening plugins */
718
683
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
719
error(0, errno, "fopen");
684
perror("fopen");
720
685
exitstatus = EX_OSERR;
721
686
goto fallback;
722
687
}
733
698
case ENOMEM:
734
699
default:
735
700
errno = ret;
736
error(0, errno, "argp_parse");
701
perror("argp_parse");
737
702
exitstatus = EX_OSERR;
738
703
goto fallback;
739
704
case EINVAL:
753
718
case ENOMEM:
754
719
default:
755
720
errno = ret;
756
error(0, errno, "argp_parse");
721
perror("argp_parse");
757
722
exitstatus = EX_OSERR;
758
723
goto fallback;
759
724
case EINVAL:
775
740
}
776
741
}
777
742
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);
743
/* Strip permissions down to nobody */
744
setgid(gid);
804
745
if(ret == -1){
805
error(0, errno, "setgid");
746
perror("setgid");
806
747
}
807
748
ret = setuid(uid);
808
749
if(ret == -1){
809
error(0, errno, "setuid");
750
perror("setuid");
810
751
}
811
752
812
753
/* Open plugin directory with close_on_exec flag */
813
754
{
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
);
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
}
821
773
if(dir_fd == -1){
822
error(0, errno, "Could not open plugin dir");
774
perror("Could not open plugin dir");
823
775
exitstatus = EX_UNAVAILABLE;
824
776
goto fallback;
825
777
}
828
780
/* Set the FD_CLOEXEC flag on the directory */
829
781
ret = set_cloexec_flag(dir_fd);
830
782
if(ret < 0){
831
error(0, errno, "set_cloexec_flag");
783
perror("set_cloexec_flag");
784
TEMP_FAILURE_RETRY(close(dir_fd));
832
785
exitstatus = EX_OSERR;
833
786
goto fallback;
834
787
}
835
788
#endif /* O_CLOEXEC */
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
}
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;
859
796
}
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;
880
797
}
881
798
882
799
FD_ZERO(&rfds_all);
883
800
884
801
/* Read and execute any executable in the plugin directory*/
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]);
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");
891
874
continue;
892
875
}
893
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
876
877
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
894
878
if(ret == -1){
895
error(0, errno, "stat");
896
TEMP_FAILURE_RETRY(close(plugin_fd));
897
free(direntries[i]);
879
perror("stat");
880
free(filename);
898
881
continue;
899
882
}
900
883
901
884
/* Ignore non-executable files */
902
885
if(not S_ISREG(st.st_mode)
903
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
904
X_OK, 0)) != 0)){
886
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
905
887
if(debug){
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);
888
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
889
" with bad type or mode\n", filename);
910
890
}
911
TEMP_FAILURE_RETRY(close(plugin_fd));
912
free(direntries[i]);
891
free(filename);
913
892
continue;
914
893
}
915
894
916
plugin *p = getplugin(direntries[i]->d_name);
895
plugin *p = getplugin(dirst->d_name);
917
896
if(p == NULL){
918
error(0, errno, "getplugin");
919
TEMP_FAILURE_RETRY(close(plugin_fd));
920
free(direntries[i]);
897
perror("getplugin");
898
free(filename);
921
899
continue;
922
900
}
923
901
if(p->disabled){
924
902
if(debug){
925
903
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
926
direntries[i]->d_name);
904
dirst->d_name);
927
905
}
928
TEMP_FAILURE_RETRY(close(plugin_fd));
929
free(direntries[i]);
906
free(filename);
930
907
continue;
931
908
}
932
909
{
935
912
if(g != NULL){
936
913
for(char **a = g->argv + 1; *a != NULL; a++){
937
914
if(not add_argument(p, *a)){
938
error(0, errno, "add_argument");
915
perror("add_argument");
939
916
}
940
917
}
941
918
/* Add global environment variables */
942
919
for(char **e = g->environ; *e != NULL; e++){
943
920
if(not add_environment(p, *e, false)){
944
error(0, errno, "add_environment");
921
perror("add_environment");
945
922
}
946
923
}
947
924
}
948
925
}
949
/* If this plugin has any environment variables, we need to
950
duplicate the environment from this process, too. */
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. */
951
929
if(p->environ[0] != NULL){
952
930
for(char **e = environ; *e != NULL; e++){
953
931
if(not add_environment(p, *e, false)){
954
error(0, errno, "add_environment");
932
perror("add_environment");
955
933
}
956
934
}
957
935
}
958
936
959
937
int pipefd[2];
960
#ifndef O_CLOEXEC
961
938
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 */
965
939
if(ret == -1){
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
940
perror("pipe");
941
exitstatus = EX_OSERR;
942
goto fallback;
943
}
981
944
/* Ask OS to automatic close the pipe on exec */
982
945
ret = set_cloexec_flag(pipefd[0]);
983
946
if(ret < 0){
984
error(0, errno, "set_cloexec_flag");
985
TEMP_FAILURE_RETRY(close(pipefd[0]));
986
TEMP_FAILURE_RETRY(close(pipefd[1]));
947
perror("set_cloexec_flag");
987
948
exitstatus = EX_OSERR;
988
free(direntries[i]);
989
949
goto fallback;
990
950
}
991
951
ret = set_cloexec_flag(pipefd[1]);
992
952
if(ret < 0){
993
error(0, errno, "set_cloexec_flag");
994
TEMP_FAILURE_RETRY(close(pipefd[0]));
995
TEMP_FAILURE_RETRY(close(pipefd[1]));
953
perror("set_cloexec_flag");
996
954
exitstatus = EX_OSERR;
997
free(direntries[i]);
998
955
goto fallback;
999
956
}
1000
#endif /* not O_CLOEXEC */
1001
957
/* Block SIGCHLD until process is safely in process list */
1002
958
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1003
959
&sigchld_action.sa_mask,
1004
960
NULL));
1005
961
if(ret < 0){
1006
error(0, errno, "sigprocmask");
962
perror("sigprocmask");
1007
963
exitstatus = EX_OSERR;
1008
free(direntries[i]);
1009
964
goto fallback;
1010
965
}
1011
966
/* Starting a new process to be watched */
1014
969
pid = fork();
1015
970
} while(pid == -1 and errno == EINTR);
1016
971
if(pid == -1){
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]));
972
perror("fork");
1022
973
exitstatus = EX_OSERR;
1023
free(direntries[i]);
1024
974
goto fallback;
1025
975
}
1026
976
if(pid == 0){
1027
977
/* this is the child process */
1028
978
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1029
979
if(ret < 0){
1030
error(0, errno, "sigaction");
980
perror("sigaction");
1031
981
_exit(EX_OSERR);
1032
982
}
1033
983
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1034
984
if(ret < 0){
1035
error(0, errno, "sigprocmask");
985
perror("sigprocmask");
1036
986
_exit(EX_OSERR);
1037
987
}
1038
988
1039
989
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1040
990
if(ret == -1){
1041
error(0, errno, "dup2");
991
perror("dup2");
1042
992
_exit(EX_OSERR);
1043
993
}
1044
994
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);
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
}
1051
1010
}
1052
1011
/* no return */
1053
1012
}
1054
1013
/* Parent process */
1055
1014
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1056
1015
pipe */
1057
TEMP_FAILURE_RETRY(close(plugin_fd));
1058
plugin *new_plugin = getplugin(direntries[i]->d_name);
1016
free(filename);
1017
plugin *new_plugin = getplugin(dirst->d_name);
1059
1018
if(new_plugin == NULL){
1060
error(0, errno, "getplugin");
1019
perror("getplugin");
1061
1020
ret = (int)(TEMP_FAILURE_RETRY
1062
1021
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1063
1022
NULL)));
1064
1023
if(ret < 0){
1065
error(0, errno, "sigprocmask");
1024
perror("sigprocmask");
1066
1025
}
1067
1026
exitstatus = EX_OSERR;
1068
free(direntries[i]);
1069
1027
goto fallback;
1070
1028
}
1071
free(direntries[i]);
1072
1029
1073
1030
new_plugin->pid = pid;
1074
1031
new_plugin->fd = pipefd[0];
1079
1036
&sigchld_action.sa_mask,
1080
1037
NULL));
1081
1038
if(ret < 0){
1082
error(0, errno, "sigprocmask");
1039
perror("sigprocmask");
1083
1040
exitstatus = EX_OSERR;
1084
1041
goto fallback;
1085
1042
}
1086
1043
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
1093
1044
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
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
-Wconversion */
1101
1046
1102
1047
if(maxfd < new_plugin->fd){
1103
1048
maxfd = new_plugin->fd;
1104
1049
}
1105
1050
}
1106
1051
1107
free(direntries);
1108
direntries = NULL;
1109
TEMP_FAILURE_RETRY(close(dir_fd));
1110
dir_fd = -1;
1052
TEMP_FAILURE_RETRY(closedir(dir));
1053
dir = NULL;
1111
1054
free_plugin(getplugin(NULL));
1112
1055
1113
1056
for(plugin *p = plugin_list; p != NULL; p = p->next){
1126
1069
fd_set rfds = rfds_all;
1127
1070
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1128
1071
if(select_ret == -1 and errno != EINTR){
1129
error(0, errno, "select");
1072
perror("select");
1130
1073
exitstatus = EX_OSERR;
1131
1074
goto fallback;
1132
1075
}
1159
1102
}
1160
1103
1161
1104
/* 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
1168
1105
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
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
-Wconversion */
1176
1107
1177
1108
/* Block signal while modifying process_list */
1178
1109
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1180
1111
&sigchld_action.sa_mask,
1181
1112
NULL));
1182
1113
if(ret < 0){
1183
error(0, errno, "sigprocmask");
1114
perror("sigprocmask");
1184
1115
exitstatus = EX_OSERR;
1185
1116
goto fallback;
1186
1117
}
1194
1125
(sigprocmask(SIG_UNBLOCK,
1195
1126
&sigchld_action.sa_mask, NULL)));
1196
1127
if(ret < 0){
1197
error(0, errno, "sigprocmask");
1128
perror("sigprocmask");
1198
1129
exitstatus = EX_OSERR;
1199
1130
goto fallback;
1200
1131
}
1211
1142
bool bret = print_out_password(proc->buffer,
1212
1143
proc->buffer_length);
1213
1144
if(not bret){
1214
error(0, errno, "print_out_password");
1145
perror("print_out_password");
1215
1146
exitstatus = EX_IOERR;
1216
1147
}
1217
1148
goto fallback;
1218
1149
}
1219
1150
1220
1151
/* 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
1227
1152
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1228
1153
warning from
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
-Wconversion */
1238
1155
/* This process had nothing to say at this time */
1239
1156
proc = proc->next;
1240
1157
continue;
1241
1158
}
1242
1159
/* Before reading, make the process' data buffer large enough */
1243
1160
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
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");
1161
proc->buffer = realloc(proc->buffer, proc->buffer_size
1162
+ (size_t) BUFFER_SIZE);
1163
if(proc->buffer == NULL){
1164
perror("malloc");
1248
1165
exitstatus = EX_OSERR;
1249
1166
goto fallback;
1250
1167
}
1251
proc->buffer = new_buffer;
1252
1168
proc->buffer_size += BUFFER_SIZE;
1253
1169
}
1254
1170
/* Read from the process */
1288
1204
}
1289
1205
bret = print_out_password(passwordbuffer, len);
1290
1206
if(not bret){
1291
error(0, errno, "print_out_password");
1207
perror("print_out_password");
1292
1208
exitstatus = EX_IOERR;
1293
1209
}
1294
1210
}
1296
1212
/* Restore old signal handler */
1297
1213
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1298
1214
if(ret == -1){
1299
error(0, errno, "sigaction");
1215
perror("sigaction");
1300
1216
exitstatus = EX_OSERR;
1301
1217
}
1302
1218
1307
1223
free(custom_argv);
1308
1224
}
1309
1225
1310
free(direntries);
1311
1312
if(dir_fd != -1){
1313
TEMP_FAILURE_RETRY(close(dir_fd));
1226
if(dir != NULL){
1227
closedir(dir);
1314
1228
}
1315
1229
1316
1230
/* Kill the processes */
1320
1234
ret = kill(p->pid, SIGTERM);
1321
1235
if(ret == -1 and errno != ESRCH){
1322
1236
/* Set-uid proccesses might not get closed */
1323
error(0, errno, "kill");
1237
perror("kill");
1324
1238
}
1325
1239
}
1326
1240
}
1330
1244
ret = wait(NULL);
1331
1245
} while(ret >= 0);
1332
1246
if(errno != ECHILD){
1333
error(0, errno, "wait");
1247
perror("wait");
1334
1248
}
1335
1249
1336
1250
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0