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- Committer: Teddy Hogeborn
- Date: 2015-05-30 16:47:00 UTC
- Revision ID: teddy@recompile.se-20150530164700-77zrd7964gdhbk1f
mandos: Disable D-Bus if any DBusException is raised when connecting.
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008-2018 Teddy Hogeborn
6
* Copyright © 2008-2018 Björn Påhlsson
7
*
8
* This file is part of Mandos.
9
*
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
14
*
15
* Mandos is distributed in the hope that it will be useful, but
5
* Copyright © 2008-2014 Teddy Hogeborn
6
* Copyright © 2008-2014 Björn Påhlsson
7
*
8
* This program is free software: you can redistribute it and/or
9
* modify it under the terms of the GNU General Public License as
10
* published by the Free Software Foundation, either version 3 of the
11
* License, or (at your option) any later version.
12
*
13
* This program is distributed in the hope that it will be useful, but
16
14
* WITHOUT ANY WARRANTY; without even the implied warranty of
17
15
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18
16
* General Public License for more details.
19
17
*
20
18
* You should have received a copy of the GNU General Public License
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
19
* along with this program. If not, see
20
* <http://www.gnu.org/licenses/>.
22
21
*
23
22
* Contact the authors at <mandos@recompile.se>.
24
23
*/
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
WEXITSTATUS(), WTERMSIG() */
40
WEXITSTATUS(), WTERMSIG(),
41
WCOREDUMP() */
42
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
43
43
#include <iso646.h> /* and, or, not */
44
44
#include <dirent.h> /* struct dirent, scandirat() */
76
76
#define BUFFER_SIZE 256
77
77
78
78
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
80
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
81
80
82
81
const char *argp_program_version = "plugin-runner " VERSION;
313
312
__attribute__((nonnull))
314
313
static void free_plugin(plugin *plugin_node){
315
314
316
free(plugin_node->name);
317
315
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
318
316
free(*arg);
319
317
}
349
347
350
348
int main(int argc, char *argv[]){
351
349
char *plugindir = NULL;
352
char *pluginhelperdir = NULL;
353
350
char *argfile = NULL;
354
351
FILE *conffp;
355
352
struct dirent **direntries = NULL;
417
414
.doc = "Group ID the plugins will run as", .group = 3 },
418
415
{ .name = "debug", .key = 132,
419
416
.doc = "Debug mode", .group = 4 },
420
{ .name = "plugin-helper-dir", .key = 133,
421
.arg = "DIRECTORY",
422
.doc = "Specify a different plugin helper directory",
423
.group = 2 },
424
417
/*
425
418
* These reproduce what we would get without ARGP_NO_HELP
426
419
*/
552
545
case 132: /* --debug */
553
546
debug = true;
554
547
break;
555
case 133: /* --plugin-helper-dir */
556
free(pluginhelperdir);
557
pluginhelperdir = strdup(arg);
558
if(pluginhelperdir != NULL){
559
errno = 0;
560
}
561
break;
562
548
/*
563
549
* These reproduce what we would get without ARGP_NO_HELP
564
550
*/
615
601
case 130: /* --userid */
616
602
case 131: /* --groupid */
617
603
case 132: /* --debug */
618
case 133: /* --plugin-helper-dir */
619
604
case '?': /* --help */
620
605
case -3: /* --usage */
621
606
case 'V': /* --version */
702
687
custom_argc += 1;
703
688
{
704
689
char **new_argv = realloc(custom_argv, sizeof(char *)
705
* ((size_t)custom_argc + 1));
690
* ((unsigned int)
691
custom_argc + 1));
706
692
if(new_argv == NULL){
707
693
error(0, errno, "realloc");
708
694
exitstatus = EX_OSERR;
775
761
goto fallback;
776
762
}
777
763
778
{
779
char *pluginhelperenv;
780
bool bret = true;
781
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
782
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
783
if(ret != -1){
784
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
785
}
786
if(ret == -1 or not bret){
787
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
788
" environment variable to \"%s\" for all plugins\n",
789
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
790
}
791
if(ret != -1){
792
free(pluginhelperenv);
793
}
794
}
795
796
764
if(debug){
797
for(plugin *p = plugin_list; p != NULL; p = p->next){
765
for(plugin *p = plugin_list; p != NULL; p=p->next){
798
766
fprintf(stderr, "Plugin: %s has %d arguments\n",
799
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p->name ? p->name : "Global", p->argc - 1);
800
768
for(char **a = p->argv; *a != NULL; a++){
809
777
810
778
if(getuid() == 0){
811
779
/* Work around Debian bug #633582:
812
<https://bugs.debian.org/633582> */
780
<http://bugs.debian.org/633582> */
813
781
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
814
782
if(plugindir_fd == -1){
815
783
if(errno != ENOENT){
827
795
}
828
796
}
829
797
}
830
close(plugindir_fd);
798
TEMP_FAILURE_RETRY(close(plugindir_fd));
831
799
}
832
800
}
833
801
892
860
return 1;
893
861
}
894
862
863
#ifdef __GLIBC__
864
#if __GLIBC_PREREQ(2, 15)
895
865
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
896
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__ */
897
875
if(numplugins == -1){
898
876
error(0, errno, "Could not scan plugin dir");
899
877
direntries = NULL;
915
893
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
916
894
if(ret == -1){
917
895
error(0, errno, "stat");
918
close(plugin_fd);
896
TEMP_FAILURE_RETRY(close(plugin_fd));
919
897
free(direntries[i]);
920
898
continue;
921
899
}
930
908
plugindir != NULL ? plugindir : PDIR,
931
909
direntries[i]->d_name);
932
910
}
933
close(plugin_fd);
911
TEMP_FAILURE_RETRY(close(plugin_fd));
934
912
free(direntries[i]);
935
913
continue;
936
914
}
938
916
plugin *p = getplugin(direntries[i]->d_name);
939
917
if(p == NULL){
940
918
error(0, errno, "getplugin");
941
close(plugin_fd);
919
TEMP_FAILURE_RETRY(close(plugin_fd));
942
920
free(direntries[i]);
943
921
continue;
944
922
}
947
925
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
948
926
direntries[i]->d_name);
949
927
}
950
close(plugin_fd);
928
TEMP_FAILURE_RETRY(close(plugin_fd));
951
929
free(direntries[i]);
952
930
continue;
953
931
}
993
971
if(pipefd[0] >= FD_SETSIZE){
994
972
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
995
973
FD_SETSIZE);
996
close(pipefd[0]);
997
close(pipefd[1]);
974
TEMP_FAILURE_RETRY(close(pipefd[0]));
975
TEMP_FAILURE_RETRY(close(pipefd[1]));
998
976
exitstatus = EX_OSERR;
999
977
free(direntries[i]);
1000
978
goto fallback;
1004
982
ret = set_cloexec_flag(pipefd[0]);
1005
983
if(ret < 0){
1006
984
error(0, errno, "set_cloexec_flag");
1007
close(pipefd[0]);
1008
close(pipefd[1]);
985
TEMP_FAILURE_RETRY(close(pipefd[0]));
986
TEMP_FAILURE_RETRY(close(pipefd[1]));
1009
987
exitstatus = EX_OSERR;
1010
988
free(direntries[i]);
1011
989
goto fallback;
1013
991
ret = set_cloexec_flag(pipefd[1]);
1014
992
if(ret < 0){
1015
993
error(0, errno, "set_cloexec_flag");
1016
close(pipefd[0]);
1017
close(pipefd[1]);
994
TEMP_FAILURE_RETRY(close(pipefd[0]));
995
TEMP_FAILURE_RETRY(close(pipefd[1]));
1018
996
exitstatus = EX_OSERR;
1019
997
free(direntries[i]);
1020
998
goto fallback;
1039
1017
error(0, errno, "fork");
1040
1018
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1041
1019
&sigchld_action.sa_mask, NULL));
1042
close(pipefd[0]);
1043
close(pipefd[1]);
1020
TEMP_FAILURE_RETRY(close(pipefd[0]));
1021
TEMP_FAILURE_RETRY(close(pipefd[1]));
1044
1022
exitstatus = EX_OSERR;
1045
1023
free(direntries[i]);
1046
1024
goto fallback;
1074
1052
/* no return */
1075
1053
}
1076
1054
/* Parent process */
1077
close(pipefd[1]); /* Close unused write end of pipe */
1078
close(plugin_fd);
1055
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1056
pipe */
1057
TEMP_FAILURE_RETRY(close(plugin_fd));
1079
1058
plugin *new_plugin = getplugin(direntries[i]->d_name);
1080
1059
if(new_plugin == NULL){
1081
1060
error(0, errno, "getplugin");
1105
1084
goto fallback;
1106
1085
}
1107
1086
1108
FD_SET(new_plugin->fd, &rfds_all);
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
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
1109
1101
1110
1102
if(maxfd < new_plugin->fd){
1111
1103
maxfd = new_plugin->fd;
1114
1106
1115
1107
free(direntries);
1116
1108
direntries = NULL;
1117
close(dir_fd);
1109
TEMP_FAILURE_RETRY(close(dir_fd));
1118
1110
dir_fd = -1;
1119
1111
free_plugin(getplugin(NULL));
1120
1112
1160
1152
(intmax_t) (proc->pid),
1161
1153
WTERMSIG(proc->status),
1162
1154
strsignal(WTERMSIG(proc->status)));
1155
} else if(WCOREDUMP(proc->status)){
1156
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1157
" core\n", proc->name, (intmax_t) (proc->pid));
1163
1158
}
1164
1159
}
1165
1160
1166
1161
/* Remove the plugin */
1167
FD_CLR(proc->fd, &rfds_all);
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
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
1168
1176
1169
1177
/* Block signal while modifying process_list */
1170
1178
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1210
1218
}
1211
1219
1212
1220
/* This process has not completed. Does it have any output? */
1213
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
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
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1228
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
1214
1238
/* This process had nothing to say at this time */
1215
1239
proc = proc->next;
1216
1240
continue;
1286
1310
free(direntries);
1287
1311
1288
1312
if(dir_fd != -1){
1289
close(dir_fd);
1313
TEMP_FAILURE_RETRY(close(dir_fd));
1290
1314
}
1291
1315
1292
1316
/* Kill the processes */
1312
1336
free_plugin_list();
1313
1337
1314
1338
free(plugindir);
1315
free(pluginhelperdir);
1316
1339
free(argfile);
1317
1340
1318
1341
return exitstatus;
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