To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 237.2.182
- compare with another revision
- download diff
- download tarball
- view history from revision 237.2.182
- Committer: teddy at bsnet
- Date: 2010-09-09 18:16:14 UTC
- mfrom: (269.1.3 mandos-empty-device)
- mto: (24.1.162 mandos) (237.12.2 mandos-persistent) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 270.
- Revision ID: teddy@fukt.bsnet.se-20100909181614-oanlmvkzsiodbo3c
Merge in branch to interpret an empty device name to mean
"autodetect".
"autodetect".
- files removed:
- DBUS-API
- debian/source
- 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 © 2008-2012 Teddy Hogeborn
6
* Copyright © 2008-2012 Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
7
7
*
8
8
* This program is free software: you can redistribute it and/or
9
9
* modify it under the terms of the GNU General Public License as
19
19
* along with this program. If not, see
20
20
* <http://www.gnu.org/licenses/>.
21
21
*
22
* Contact the authors at <mandos@recompile.se>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
23
23
*/
24
24
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
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(),
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
32
stderr, STDOUT_FILENO */
33
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
34
34
stat, waitpid(), WIFEXITED(),
70
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
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 */
171
169
}
172
170
173
171
/* Helper function for add_argument and add_environment */
174
__attribute__((nonnull))
175
172
static bool add_to_char_array(const char *new, char ***array,
176
173
int *len){
177
174
/* Resize the pointed-to array to hold one more pointer */
200
197
}
201
198
202
199
/* Add to a plugin's argument vector */
203
__attribute__((nonnull(2)))
204
200
static bool add_argument(plugin *p, const char *arg){
205
201
if(p == NULL){
206
202
return false;
209
205
}
210
206
211
207
/* Add to a plugin's environment */
212
__attribute__((nonnull(2)))
213
208
static bool add_environment(plugin *p, const char *def, bool replace){
214
209
if(p == NULL){
215
210
return false;
271
266
/* No child processes */
272
267
break;
273
268
}
274
error(0, errno, "waitpid");
269
perror("waitpid");
275
270
}
276
271
277
272
/* A child exited, find it in process_list */
289
284
}
290
285
291
286
/* Prints out a password to stdout */
292
__attribute__((nonnull))
293
287
static bool print_out_password(const char *buffer, size_t length){
294
288
ssize_t ret;
295
289
for(size_t written = 0; written < length; written += (size_t)ret){
303
297
}
304
298
305
299
/* Removes and free a plugin from the plugin list */
306
__attribute__((nonnull))
307
300
static void free_plugin(plugin *plugin_node){
308
301
309
302
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
364
357
sigemptyset(&sigchld_action.sa_mask);
365
358
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
366
359
if(ret == -1){
367
error(0, errno, "sigaddset");
360
perror("sigaddset");
368
361
exitstatus = EX_OSERR;
369
362
goto fallback;
370
363
}
371
364
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
372
365
if(ret == -1){
373
error(0, errno, "sigaction");
366
perror("sigaction");
374
367
exitstatus = EX_OSERR;
375
368
goto fallback;
376
369
}
421
414
{ .name = NULL }
422
415
};
423
416
424
__attribute__((nonnull(3)))
425
417
error_t parse_opt(int key, char *arg, struct argp_state *state){
426
418
errno = 0;
427
419
switch(key){
428
420
char *tmp;
429
intmax_t tmp_id;
421
intmax_t tmpmax;
430
422
case 'g': /* --global-options */
431
423
{
432
424
char *plugin_option;
505
497
/* This is already done by parse_opt_config_file() */
506
498
break;
507
499
case 130: /* --userid */
508
tmp_id = strtoimax(arg, &tmp, 10);
500
tmpmax = strtoimax(arg, &tmp, 10);
509
501
if(errno != 0 or tmp == arg or *tmp != '\0'
510
or tmp_id != (uid_t)tmp_id){
502
or tmpmax != (uid_t)tmpmax){
511
503
argp_error(state, "Bad user ID number: \"%s\", using %"
512
504
PRIdMAX, arg, (intmax_t)uid);
513
505
break;
514
506
}
515
uid = (uid_t)tmp_id;
507
uid = (uid_t)tmpmax;
516
508
break;
517
509
case 131: /* --groupid */
518
tmp_id = strtoimax(arg, &tmp, 10);
510
tmpmax = strtoimax(arg, &tmp, 10);
519
511
if(errno != 0 or tmp == arg or *tmp != '\0'
520
or tmp_id != (gid_t)tmp_id){
512
or tmpmax != (gid_t)tmpmax){
521
513
argp_error(state, "Bad group ID number: \"%s\", using %"
522
514
PRIdMAX, arg, (intmax_t)gid);
523
515
break;
524
516
}
525
gid = (gid_t)tmp_id;
517
gid = (gid_t)tmpmax;
526
518
break;
527
519
case 132: /* --debug */
528
520
debug = true;
607
599
case ENOMEM:
608
600
default:
609
601
errno = ret;
610
error(0, errno, "argp_parse");
602
perror("argp_parse");
611
603
exitstatus = EX_OSERR;
612
604
goto fallback;
613
605
case EINVAL:
634
626
custom_argc = 1;
635
627
custom_argv = malloc(sizeof(char*) * 2);
636
628
if(custom_argv == NULL){
637
error(0, errno, "malloc");
629
perror("malloc");
638
630
exitstatus = EX_OSERR;
639
631
goto fallback;
640
632
}
657
649
}
658
650
new_arg = strdup(p);
659
651
if(new_arg == NULL){
660
error(0, errno, "strdup");
652
perror("strdup");
661
653
exitstatus = EX_OSERR;
662
654
free(org_line);
663
655
goto fallback;
667
659
custom_argv = realloc(custom_argv, sizeof(char *)
668
660
* ((unsigned int) custom_argc + 1));
669
661
if(custom_argv == NULL){
670
error(0, errno, "realloc");
662
perror("realloc");
671
663
exitstatus = EX_OSERR;
672
664
free(org_line);
673
665
goto fallback;
680
672
ret = fclose(conffp);
681
673
} while(ret == EOF and errno == EINTR);
682
674
if(ret == EOF){
683
error(0, errno, "fclose");
675
perror("fclose");
684
676
exitstatus = EX_IOERR;
685
677
goto fallback;
686
678
}
689
681
/* Check for harmful errors and go to fallback. Other errors might
690
682
not affect opening plugins */
691
683
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
692
error(0, errno, "fopen");
684
perror("fopen");
693
685
exitstatus = EX_OSERR;
694
686
goto fallback;
695
687
}
706
698
case ENOMEM:
707
699
default:
708
700
errno = ret;
709
error(0, errno, "argp_parse");
701
perror("argp_parse");
710
702
exitstatus = EX_OSERR;
711
703
goto fallback;
712
704
case EINVAL:
726
718
case ENOMEM:
727
719
default:
728
720
errno = ret;
729
error(0, errno, "argp_parse");
721
perror("argp_parse");
730
722
exitstatus = EX_OSERR;
731
723
goto fallback;
732
724
case EINVAL:
748
740
}
749
741
}
750
742
751
if(getuid() == 0){
752
/* Work around Debian bug #633582:
753
<http://bugs.debian.org/633582> */
754
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
755
if(plugindir_fd == -1){
756
error(0, errno, "open");
757
} else {
758
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
759
if(ret == -1){
760
error(0, errno, "fstat");
761
} else {
762
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
763
ret = fchown(plugindir_fd, uid, gid);
764
if(ret == -1){
765
error(0, errno, "fchown");
766
}
767
}
768
}
769
TEMP_FAILURE_RETRY(close(plugindir_fd));
770
}
771
}
772
773
/* Lower permissions */
774
ret = setgid(gid);
743
/* Strip permissions down to nobody */
744
setgid(gid);
775
745
if(ret == -1){
776
error(0, errno, "setgid");
746
perror("setgid");
777
747
}
778
748
ret = setuid(uid);
779
749
if(ret == -1){
780
error(0, errno, "setuid");
750
perror("setuid");
781
751
}
782
752
783
753
/* Open plugin directory with close_on_exec flag */
801
771
);
802
772
}
803
773
if(dir_fd == -1){
804
error(0, errno, "Could not open plugin dir");
774
perror("Could not open plugin dir");
805
775
exitstatus = EX_UNAVAILABLE;
806
776
goto fallback;
807
777
}
810
780
/* Set the FD_CLOEXEC flag on the directory */
811
781
ret = set_cloexec_flag(dir_fd);
812
782
if(ret < 0){
813
error(0, errno, "set_cloexec_flag");
783
perror("set_cloexec_flag");
814
784
TEMP_FAILURE_RETRY(close(dir_fd));
815
785
exitstatus = EX_OSERR;
816
786
goto fallback;
819
789
820
790
dir = fdopendir(dir_fd);
821
791
if(dir == NULL){
822
error(0, errno, "Could not open plugin dir");
792
perror("Could not open plugin dir");
823
793
TEMP_FAILURE_RETRY(close(dir_fd));
824
794
exitstatus = EX_OSERR;
825
795
goto fallback;
837
807
/* All directory entries have been processed */
838
808
if(dirst == NULL){
839
809
if(errno == EBADF){
840
error(0, errno, "readdir");
810
perror("readdir");
841
811
exitstatus = EX_IOERR;
842
812
goto fallback;
843
813
}
900
870
dirst->d_name));
901
871
}
902
872
if(ret < 0){
903
error(0, errno, "asprintf");
873
perror("asprintf");
904
874
continue;
905
875
}
906
876
907
877
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
908
878
if(ret == -1){
909
error(0, errno, "stat");
879
perror("stat");
910
880
free(filename);
911
881
continue;
912
882
}
924
894
925
895
plugin *p = getplugin(dirst->d_name);
926
896
if(p == NULL){
927
error(0, errno, "getplugin");
897
perror("getplugin");
928
898
free(filename);
929
899
continue;
930
900
}
942
912
if(g != NULL){
943
913
for(char **a = g->argv + 1; *a != NULL; a++){
944
914
if(not add_argument(p, *a)){
945
error(0, errno, "add_argument");
915
perror("add_argument");
946
916
}
947
917
}
948
918
/* Add global environment variables */
949
919
for(char **e = g->environ; *e != NULL; e++){
950
920
if(not add_environment(p, *e, false)){
951
error(0, errno, "add_environment");
921
perror("add_environment");
952
922
}
953
923
}
954
924
}
959
929
if(p->environ[0] != NULL){
960
930
for(char **e = environ; *e != NULL; e++){
961
931
if(not add_environment(p, *e, false)){
962
error(0, errno, "add_environment");
932
perror("add_environment");
963
933
}
964
934
}
965
935
}
967
937
int pipefd[2];
968
938
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
969
939
if(ret == -1){
970
error(0, errno, "pipe");
940
perror("pipe");
971
941
exitstatus = EX_OSERR;
972
942
goto fallback;
973
943
}
974
944
/* Ask OS to automatic close the pipe on exec */
975
945
ret = set_cloexec_flag(pipefd[0]);
976
946
if(ret < 0){
977
error(0, errno, "set_cloexec_flag");
947
perror("set_cloexec_flag");
978
948
exitstatus = EX_OSERR;
979
949
goto fallback;
980
950
}
981
951
ret = set_cloexec_flag(pipefd[1]);
982
952
if(ret < 0){
983
error(0, errno, "set_cloexec_flag");
953
perror("set_cloexec_flag");
984
954
exitstatus = EX_OSERR;
985
955
goto fallback;
986
956
}
989
959
&sigchld_action.sa_mask,
990
960
NULL));
991
961
if(ret < 0){
992
error(0, errno, "sigprocmask");
962
perror("sigprocmask");
993
963
exitstatus = EX_OSERR;
994
964
goto fallback;
995
965
}
999
969
pid = fork();
1000
970
} while(pid == -1 and errno == EINTR);
1001
971
if(pid == -1){
1002
error(0, errno, "fork");
972
perror("fork");
1003
973
exitstatus = EX_OSERR;
1004
974
goto fallback;
1005
975
}
1007
977
/* this is the child process */
1008
978
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1009
979
if(ret < 0){
1010
error(0, errno, "sigaction");
980
perror("sigaction");
1011
981
_exit(EX_OSERR);
1012
982
}
1013
983
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1014
984
if(ret < 0){
1015
error(0, errno, "sigprocmask");
985
perror("sigprocmask");
1016
986
_exit(EX_OSERR);
1017
987
}
1018
988
1019
989
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1020
990
if(ret == -1){
1021
error(0, errno, "dup2");
991
perror("dup2");
1022
992
_exit(EX_OSERR);
1023
993
}
1024
994
1029
999
}
1030
1000
if(p->environ[0] == NULL){
1031
1001
if(execv(filename, p->argv) < 0){
1032
error(0, errno, "execv for %s", filename);
1002
perror("execv");
1033
1003
_exit(EX_OSERR);
1034
1004
}
1035
1005
} else {
1036
1006
if(execve(filename, p->argv, p->environ) < 0){
1037
error(0, errno, "execve for %s", filename);
1007
perror("execve");
1038
1008
_exit(EX_OSERR);
1039
1009
}
1040
1010
}
1046
1016
free(filename);
1047
1017
plugin *new_plugin = getplugin(dirst->d_name);
1048
1018
if(new_plugin == NULL){
1049
error(0, errno, "getplugin");
1019
perror("getplugin");
1050
1020
ret = (int)(TEMP_FAILURE_RETRY
1051
1021
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1052
1022
NULL)));
1053
1023
if(ret < 0){
1054
error(0, errno, "sigprocmask");
1024
perror("sigprocmask");
1055
1025
}
1056
1026
exitstatus = EX_OSERR;
1057
1027
goto fallback;
1066
1036
&sigchld_action.sa_mask,
1067
1037
NULL));
1068
1038
if(ret < 0){
1069
error(0, errno, "sigprocmask");
1039
perror("sigprocmask");
1070
1040
exitstatus = EX_OSERR;
1071
1041
goto fallback;
1072
1042
}
1099
1069
fd_set rfds = rfds_all;
1100
1070
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1101
1071
if(select_ret == -1 and errno != EINTR){
1102
error(0, errno, "select");
1072
perror("select");
1103
1073
exitstatus = EX_OSERR;
1104
1074
goto fallback;
1105
1075
}
1141
1111
&sigchld_action.sa_mask,
1142
1112
NULL));
1143
1113
if(ret < 0){
1144
error(0, errno, "sigprocmask");
1114
perror("sigprocmask");
1145
1115
exitstatus = EX_OSERR;
1146
1116
goto fallback;
1147
1117
}
1155
1125
(sigprocmask(SIG_UNBLOCK,
1156
1126
&sigchld_action.sa_mask, NULL)));
1157
1127
if(ret < 0){
1158
error(0, errno, "sigprocmask");
1128
perror("sigprocmask");
1159
1129
exitstatus = EX_OSERR;
1160
1130
goto fallback;
1161
1131
}
1172
1142
bool bret = print_out_password(proc->buffer,
1173
1143
proc->buffer_length);
1174
1144
if(not bret){
1175
error(0, errno, "print_out_password");
1145
perror("print_out_password");
1176
1146
exitstatus = EX_IOERR;
1177
1147
}
1178
1148
goto fallback;
1191
1161
proc->buffer = realloc(proc->buffer, proc->buffer_size
1192
1162
+ (size_t) BUFFER_SIZE);
1193
1163
if(proc->buffer == NULL){
1194
error(0, errno, "malloc");
1164
perror("malloc");
1195
1165
exitstatus = EX_OSERR;
1196
1166
goto fallback;
1197
1167
}
1234
1204
}
1235
1205
bret = print_out_password(passwordbuffer, len);
1236
1206
if(not bret){
1237
error(0, errno, "print_out_password");
1207
perror("print_out_password");
1238
1208
exitstatus = EX_IOERR;
1239
1209
}
1240
1210
}
1242
1212
/* Restore old signal handler */
1243
1213
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1244
1214
if(ret == -1){
1245
error(0, errno, "sigaction");
1215
perror("sigaction");
1246
1216
exitstatus = EX_OSERR;
1247
1217
}
1248
1218
1264
1234
ret = kill(p->pid, SIGTERM);
1265
1235
if(ret == -1 and errno != ESRCH){
1266
1236
/* Set-uid proccesses might not get closed */
1267
error(0, errno, "kill");
1237
perror("kill");
1268
1238
}
1269
1239
}
1270
1240
}
1274
1244
ret = wait(NULL);
1275
1245
} while(ret >= 0);
1276
1246
if(errno != ECHILD){
1277
error(0, errno, "wait");
1247
perror("wait");
1278
1248
}
1279
1249
1280
1250
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0