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- Committer: Teddy Hogeborn
- Date: 2018-02-12 17:07:19 UTC
- mfrom: (237.4.96 release)
- Revision ID: teddy@recompile.se-20180212170719-pg26c4ob584d3xls
Merge from release branch
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
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
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
14
16
* WITHOUT ANY WARRANTY; without even the implied warranty of
15
17
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16
18
* General Public License for more details.
17
19
*
18
20
* You should have received a copy of the GNU General Public License
19
* along with this program. If not, see
20
* <http://www.gnu.org/licenses/>.
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
21
22
*
22
23
* Contact the authors at <mandos@recompile.se>.
23
24
*/
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
WEXITSTATUS(), WTERMSIG(),
41
WCOREDUMP() */
41
WEXITSTATUS(), WTERMSIG() */
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"
79
80
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
81
81
82
const char *argp_program_version = "plugin-runner " VERSION;
347
348
348
349
int main(int argc, char *argv[]){
349
350
char *plugindir = NULL;
351
char *pluginhelperdir = NULL;
350
352
char *argfile = NULL;
351
353
FILE *conffp;
352
354
struct dirent **direntries = NULL;
414
416
.doc = "Group ID the plugins will run as", .group = 3 },
415
417
{ .name = "debug", .key = 132,
416
418
.doc = "Debug mode", .group = 4 },
419
{ .name = "plugin-helper-dir", .key = 133,
420
.arg = "DIRECTORY",
421
.doc = "Specify a different plugin helper directory",
422
.group = 2 },
417
423
/*
418
424
* These reproduce what we would get without ARGP_NO_HELP
419
425
*/
545
551
case 132: /* --debug */
546
552
debug = true;
547
553
break;
554
case 133: /* --plugin-helper-dir */
555
free(pluginhelperdir);
556
pluginhelperdir = strdup(arg);
557
if(pluginhelperdir != NULL){
558
errno = 0;
559
}
560
break;
548
561
/*
549
562
* These reproduce what we would get without ARGP_NO_HELP
550
563
*/
601
614
case 130: /* --userid */
602
615
case 131: /* --groupid */
603
616
case 132: /* --debug */
617
case 133: /* --plugin-helper-dir */
604
618
case '?': /* --help */
605
619
case -3: /* --usage */
606
620
case 'V': /* --version */
687
701
custom_argc += 1;
688
702
{
689
703
char **new_argv = realloc(custom_argv, sizeof(char *)
690
* ((unsigned int)
691
custom_argc + 1));
704
* ((size_t)custom_argc + 1));
692
705
if(new_argv == NULL){
693
706
error(0, errno, "realloc");
694
707
exitstatus = EX_OSERR;
761
774
goto fallback;
762
775
}
763
776
777
{
778
char *pluginhelperenv;
779
bool bret = true;
780
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
781
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
782
if(ret != -1){
783
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
784
}
785
if(ret == -1 or not bret){
786
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
787
" environment variable to \"%s\" for all plugins\n",
788
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
789
}
790
if(ret != -1){
791
free(pluginhelperenv);
792
}
793
}
794
764
795
if(debug){
765
for(plugin *p = plugin_list; p != NULL; p=p->next){
796
for(plugin *p = plugin_list; p != NULL; p = p->next){
766
797
fprintf(stderr, "Plugin: %s has %d arguments\n",
767
798
p->name ? p->name : "Global", p->argc - 1);
768
799
for(char **a = p->argv; *a != NULL; a++){
777
808
778
809
if(getuid() == 0){
779
810
/* Work around Debian bug #633582:
780
<http://bugs.debian.org/633582> */
811
<https://bugs.debian.org/633582> */
781
812
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
782
813
if(plugindir_fd == -1){
783
814
if(errno != ENOENT){
795
826
}
796
827
}
797
828
}
798
TEMP_FAILURE_RETRY(close(plugindir_fd));
829
close(plugindir_fd);
799
830
}
800
831
}
801
832
860
891
return 1;
861
892
}
862
893
863
#ifdef __GLIBC__
864
#if __GLIBC_PREREQ(2, 15)
865
894
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
866
895
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
896
if(numplugins == -1){
876
897
error(0, errno, "Could not scan plugin dir");
877
898
direntries = NULL;
887
908
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
888
909
if(plugin_fd == -1){
889
910
error(0, errno, "Could not open plugin");
911
free(direntries[i]);
890
912
continue;
891
913
}
892
914
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
893
915
if(ret == -1){
894
916
error(0, errno, "stat");
895
TEMP_FAILURE_RETRY(close(plugin_fd));
917
close(plugin_fd);
918
free(direntries[i]);
896
919
continue;
897
920
}
898
921
906
929
plugindir != NULL ? plugindir : PDIR,
907
930
direntries[i]->d_name);
908
931
}
909
TEMP_FAILURE_RETRY(close(plugin_fd));
932
close(plugin_fd);
933
free(direntries[i]);
910
934
continue;
911
935
}
912
936
913
937
plugin *p = getplugin(direntries[i]->d_name);
914
938
if(p == NULL){
915
939
error(0, errno, "getplugin");
916
TEMP_FAILURE_RETRY(close(plugin_fd));
940
close(plugin_fd);
941
free(direntries[i]);
917
942
continue;
918
943
}
919
944
if(p->disabled){
921
946
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
922
947
direntries[i]->d_name);
923
948
}
924
TEMP_FAILURE_RETRY(close(plugin_fd));
949
close(plugin_fd);
950
free(direntries[i]);
925
951
continue;
926
952
}
927
953
{
960
986
if(ret == -1){
961
987
error(0, errno, "pipe");
962
988
exitstatus = EX_OSERR;
989
free(direntries[i]);
963
990
goto fallback;
964
991
}
965
992
if(pipefd[0] >= FD_SETSIZE){
966
993
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
967
994
FD_SETSIZE);
968
TEMP_FAILURE_RETRY(close(pipefd[0]));
969
TEMP_FAILURE_RETRY(close(pipefd[1]));
995
close(pipefd[0]);
996
close(pipefd[1]);
970
997
exitstatus = EX_OSERR;
998
free(direntries[i]);
971
999
goto fallback;
972
1000
}
973
1001
#ifndef O_CLOEXEC
975
1003
ret = set_cloexec_flag(pipefd[0]);
976
1004
if(ret < 0){
977
1005
error(0, errno, "set_cloexec_flag");
978
TEMP_FAILURE_RETRY(close(pipefd[0]));
979
TEMP_FAILURE_RETRY(close(pipefd[1]));
1006
close(pipefd[0]);
1007
close(pipefd[1]);
980
1008
exitstatus = EX_OSERR;
1009
free(direntries[i]);
981
1010
goto fallback;
982
1011
}
983
1012
ret = set_cloexec_flag(pipefd[1]);
984
1013
if(ret < 0){
985
1014
error(0, errno, "set_cloexec_flag");
986
TEMP_FAILURE_RETRY(close(pipefd[0]));
987
TEMP_FAILURE_RETRY(close(pipefd[1]));
1015
close(pipefd[0]);
1016
close(pipefd[1]);
988
1017
exitstatus = EX_OSERR;
1018
free(direntries[i]);
989
1019
goto fallback;
990
1020
}
991
1021
#endif /* not O_CLOEXEC */
996
1026
if(ret < 0){
997
1027
error(0, errno, "sigprocmask");
998
1028
exitstatus = EX_OSERR;
1029
free(direntries[i]);
999
1030
goto fallback;
1000
1031
}
1001
1032
/* Starting a new process to be watched */
1007
1038
error(0, errno, "fork");
1008
1039
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1009
1040
&sigchld_action.sa_mask, NULL));
1010
TEMP_FAILURE_RETRY(close(pipefd[0]));
1011
TEMP_FAILURE_RETRY(close(pipefd[1]));
1041
close(pipefd[0]);
1042
close(pipefd[1]);
1012
1043
exitstatus = EX_OSERR;
1044
free(direntries[i]);
1013
1045
goto fallback;
1014
1046
}
1015
1047
if(pid == 0){
1041
1073
/* no return */
1042
1074
}
1043
1075
/* Parent process */
1044
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1045
pipe */
1046
TEMP_FAILURE_RETRY(close(plugin_fd));
1076
close(pipefd[1]); /* Close unused write end of pipe */
1077
close(plugin_fd);
1047
1078
plugin *new_plugin = getplugin(direntries[i]->d_name);
1048
1079
if(new_plugin == NULL){
1049
1080
error(0, errno, "getplugin");
1054
1085
error(0, errno, "sigprocmask");
1055
1086
}
1056
1087
exitstatus = EX_OSERR;
1088
free(direntries[i]);
1057
1089
goto fallback;
1058
1090
}
1091
free(direntries[i]);
1059
1092
1060
1093
new_plugin->pid = pid;
1061
1094
new_plugin->fd = pipefd[0];
1071
1104
goto fallback;
1072
1105
}
1073
1106
1074
#if defined (__GNUC__) and defined (__GLIBC__)
1075
#if not __GLIBC_PREREQ(2, 16)
1076
#pragma GCC diagnostic push
1077
#pragma GCC diagnostic ignored "-Wsign-conversion"
1078
#endif
1079
#endif
1080
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1081
-Wconversion in GNU libc
1082
before 2.16 */
1083
#if defined (__GNUC__) and defined (__GLIBC__)
1084
#if not __GLIBC_PREREQ(2, 16)
1085
#pragma GCC diagnostic pop
1086
#endif
1087
#endif
1107
FD_SET(new_plugin->fd, &rfds_all);
1088
1108
1089
1109
if(maxfd < new_plugin->fd){
1090
1110
maxfd = new_plugin->fd;
1093
1113
1094
1114
free(direntries);
1095
1115
direntries = NULL;
1096
TEMP_FAILURE_RETRY(close(dir_fd));
1116
close(dir_fd);
1097
1117
dir_fd = -1;
1098
1118
free_plugin(getplugin(NULL));
1099
1119
1139
1159
(intmax_t) (proc->pid),
1140
1160
WTERMSIG(proc->status),
1141
1161
strsignal(WTERMSIG(proc->status)));
1142
} else if(WCOREDUMP(proc->status)){
1143
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1144
" core\n", proc->name, (intmax_t) (proc->pid));
1145
1162
}
1146
1163
}
1147
1164
1148
1165
/* Remove the plugin */
1149
#if defined (__GNUC__) and defined (__GLIBC__)
1150
#if not __GLIBC_PREREQ(2, 16)
1151
#pragma GCC diagnostic push
1152
#pragma GCC diagnostic ignored "-Wsign-conversion"
1153
#endif
1154
#endif
1155
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1156
-Wconversion in GNU libc
1157
before 2.16 */
1158
#if defined (__GNUC__) and defined (__GLIBC__)
1159
#if not __GLIBC_PREREQ(2, 16)
1160
#pragma GCC diagnostic pop
1161
#endif
1162
#endif
1166
FD_CLR(proc->fd, &rfds_all);
1163
1167
1164
1168
/* Block signal while modifying process_list */
1165
1169
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1205
1209
}
1206
1210
1207
1211
/* This process has not completed. Does it have any output? */
1208
#if defined (__GNUC__) and defined (__GLIBC__)
1209
#if not __GLIBC_PREREQ(2, 16)
1210
#pragma GCC diagnostic push
1211
#pragma GCC diagnostic ignored "-Wsign-conversion"
1212
#endif
1213
#endif
1214
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1215
warning from
1216
-Wconversion
1217
in GNU libc
1218
before
1219
2.16 */
1220
#if defined (__GNUC__) and defined (__GLIBC__)
1221
#if not __GLIBC_PREREQ(2, 16)
1222
#pragma GCC diagnostic pop
1223
#endif
1224
#endif
1212
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1225
1213
/* This process had nothing to say at this time */
1226
1214
proc = proc->next;
1227
1215
continue;
1297
1285
free(direntries);
1298
1286
1299
1287
if(dir_fd != -1){
1300
TEMP_FAILURE_RETRY(close(dir_fd));
1288
close(dir_fd);
1301
1289
}
1302
1290
1303
1291
/* Kill the processes */
1323
1311
free_plugin_list();
1324
1312
1325
1313
free(plugindir);
1314
free(pluginhelperdir);
1326
1315
free(argfile);
1327
1316
1328
1317
return exitstatus;
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