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- Committer: Teddy Hogeborn
- Date: 2018-02-22 18:34:39 UTC
- mfrom: (942 trunk)
- mto: This revision was merged to the branch mainline in revision 943.
- Revision ID: teddy@recompile.se-20180222183439-ardlmmsvs6jbkp8x
Merge from trunk
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
*/
570
583
if(arg[0] == '\0'){
571
584
break;
572
585
}
586
/* FALLTHROUGH */
573
587
default:
574
588
return ARGP_ERR_UNKNOWN;
575
589
}
601
615
case 130: /* --userid */
602
616
case 131: /* --groupid */
603
617
case 132: /* --debug */
618
case 133: /* --plugin-helper-dir */
604
619
case '?': /* --help */
605
620
case -3: /* --usage */
606
621
case 'V': /* --version */
687
702
custom_argc += 1;
688
703
{
689
704
char **new_argv = realloc(custom_argv, sizeof(char *)
690
* ((unsigned int)
691
custom_argc + 1));
705
* ((size_t)custom_argc + 1));
692
706
if(new_argv == NULL){
693
707
error(0, errno, "realloc");
694
708
exitstatus = EX_OSERR;
761
775
goto fallback;
762
776
}
763
777
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
764
796
if(debug){
765
for(plugin *p = plugin_list; p != NULL; p=p->next){
797
for(plugin *p = plugin_list; p != NULL; p = p->next){
766
798
fprintf(stderr, "Plugin: %s has %d arguments\n",
767
799
p->name ? p->name : "Global", p->argc - 1);
768
800
for(char **a = p->argv; *a != NULL; a++){
777
809
778
810
if(getuid() == 0){
779
811
/* Work around Debian bug #633582:
780
<http://bugs.debian.org/633582> */
812
<https://bugs.debian.org/633582> */
781
813
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
782
814
if(plugindir_fd == -1){
783
815
if(errno != ENOENT){
795
827
}
796
828
}
797
829
}
798
TEMP_FAILURE_RETRY(close(plugindir_fd));
830
close(plugindir_fd);
799
831
}
800
832
}
801
833
860
892
return 1;
861
893
}
862
894
863
#ifdef __GLIBC__
864
#if __GLIBC_PREREQ(2, 15)
865
895
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
866
896
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
897
if(numplugins == -1){
876
898
error(0, errno, "Could not scan plugin dir");
877
899
direntries = NULL;
887
909
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
888
910
if(plugin_fd == -1){
889
911
error(0, errno, "Could not open plugin");
912
free(direntries[i]);
890
913
continue;
891
914
}
892
915
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
893
916
if(ret == -1){
894
917
error(0, errno, "stat");
895
TEMP_FAILURE_RETRY(close(plugin_fd));
918
close(plugin_fd);
919
free(direntries[i]);
896
920
continue;
897
921
}
898
922
906
930
plugindir != NULL ? plugindir : PDIR,
907
931
direntries[i]->d_name);
908
932
}
909
TEMP_FAILURE_RETRY(close(plugin_fd));
933
close(plugin_fd);
934
free(direntries[i]);
910
935
continue;
911
936
}
912
937
913
938
plugin *p = getplugin(direntries[i]->d_name);
914
939
if(p == NULL){
915
940
error(0, errno, "getplugin");
916
TEMP_FAILURE_RETRY(close(plugin_fd));
941
close(plugin_fd);
942
free(direntries[i]);
917
943
continue;
918
944
}
919
945
if(p->disabled){
921
947
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
922
948
direntries[i]->d_name);
923
949
}
924
TEMP_FAILURE_RETRY(close(plugin_fd));
950
close(plugin_fd);
951
free(direntries[i]);
925
952
continue;
926
953
}
927
954
{
960
987
if(ret == -1){
961
988
error(0, errno, "pipe");
962
989
exitstatus = EX_OSERR;
990
free(direntries[i]);
963
991
goto fallback;
964
992
}
965
993
if(pipefd[0] >= FD_SETSIZE){
966
994
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
967
995
FD_SETSIZE);
968
TEMP_FAILURE_RETRY(close(pipefd[0]));
969
TEMP_FAILURE_RETRY(close(pipefd[1]));
996
close(pipefd[0]);
997
close(pipefd[1]);
970
998
exitstatus = EX_OSERR;
999
free(direntries[i]);
971
1000
goto fallback;
972
1001
}
973
1002
#ifndef O_CLOEXEC
975
1004
ret = set_cloexec_flag(pipefd[0]);
976
1005
if(ret < 0){
977
1006
error(0, errno, "set_cloexec_flag");
978
TEMP_FAILURE_RETRY(close(pipefd[0]));
979
TEMP_FAILURE_RETRY(close(pipefd[1]));
1007
close(pipefd[0]);
1008
close(pipefd[1]);
980
1009
exitstatus = EX_OSERR;
1010
free(direntries[i]);
981
1011
goto fallback;
982
1012
}
983
1013
ret = set_cloexec_flag(pipefd[1]);
984
1014
if(ret < 0){
985
1015
error(0, errno, "set_cloexec_flag");
986
TEMP_FAILURE_RETRY(close(pipefd[0]));
987
TEMP_FAILURE_RETRY(close(pipefd[1]));
1016
close(pipefd[0]);
1017
close(pipefd[1]);
988
1018
exitstatus = EX_OSERR;
1019
free(direntries[i]);
989
1020
goto fallback;
990
1021
}
991
1022
#endif /* not O_CLOEXEC */
996
1027
if(ret < 0){
997
1028
error(0, errno, "sigprocmask");
998
1029
exitstatus = EX_OSERR;
1030
free(direntries[i]);
999
1031
goto fallback;
1000
1032
}
1001
1033
/* Starting a new process to be watched */
1007
1039
error(0, errno, "fork");
1008
1040
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1009
1041
&sigchld_action.sa_mask, NULL));
1010
TEMP_FAILURE_RETRY(close(pipefd[0]));
1011
TEMP_FAILURE_RETRY(close(pipefd[1]));
1042
close(pipefd[0]);
1043
close(pipefd[1]);
1012
1044
exitstatus = EX_OSERR;
1045
free(direntries[i]);
1013
1046
goto fallback;
1014
1047
}
1015
1048
if(pid == 0){
1041
1074
/* no return */
1042
1075
}
1043
1076
/* Parent process */
1044
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1045
pipe */
1046
TEMP_FAILURE_RETRY(close(plugin_fd));
1077
close(pipefd[1]); /* Close unused write end of pipe */
1078
close(plugin_fd);
1047
1079
plugin *new_plugin = getplugin(direntries[i]->d_name);
1048
1080
if(new_plugin == NULL){
1049
1081
error(0, errno, "getplugin");
1054
1086
error(0, errno, "sigprocmask");
1055
1087
}
1056
1088
exitstatus = EX_OSERR;
1089
free(direntries[i]);
1057
1090
goto fallback;
1058
1091
}
1092
free(direntries[i]);
1059
1093
1060
1094
new_plugin->pid = pid;
1061
1095
new_plugin->fd = pipefd[0];
1071
1105
goto fallback;
1072
1106
}
1073
1107
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
1108
FD_SET(new_plugin->fd, &rfds_all);
1088
1109
1089
1110
if(maxfd < new_plugin->fd){
1090
1111
maxfd = new_plugin->fd;
1093
1114
1094
1115
free(direntries);
1095
1116
direntries = NULL;
1096
TEMP_FAILURE_RETRY(close(dir_fd));
1117
close(dir_fd);
1097
1118
dir_fd = -1;
1098
1119
free_plugin(getplugin(NULL));
1099
1120
1139
1160
(intmax_t) (proc->pid),
1140
1161
WTERMSIG(proc->status),
1141
1162
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
1163
}
1146
1164
}
1147
1165
1148
1166
/* 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
1167
FD_CLR(proc->fd, &rfds_all);
1163
1168
1164
1169
/* Block signal while modifying process_list */
1165
1170
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1205
1210
}
1206
1211
1207
1212
/* 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
1213
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1225
1214
/* This process had nothing to say at this time */
1226
1215
proc = proc->next;
1227
1216
continue;
1297
1286
free(direntries);
1298
1287
1299
1288
if(dir_fd != -1){
1300
TEMP_FAILURE_RETRY(close(dir_fd));
1289
close(dir_fd);
1301
1290
}
1302
1291
1303
1292
/* Kill the processes */
1323
1312
free_plugin_list();
1324
1313
1325
1314
free(plugindir);
1315
free(pluginhelperdir);
1326
1316
free(argfile);
1327
1317
1328
1318
return exitstatus;
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