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- Committer: Teddy Hogeborn
- Date: 2016-11-26 23:21:16 UTC
- Revision ID: teddy@recompile.se-20161126232116-nhqk9x1qij09b7cx
Add comment in documentation source with clarifying text.
* intro.xml (INTRODUCTION): Add comment with clarification.
* intro.xml (INTRODUCTION): Add comment with clarification.
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 © 2008-2016 Teddy Hogeborn
6
* Copyright © 2008-2016 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
37
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
38
FD_SET(), FD_ISSET(), FD_CLR */
39
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS(), WTERMSIG(),
41
WCOREDUMP() */
40
WEXITSTATUS(), WTERMSIG() */
42
41
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
43
42
#include <iso646.h> /* and, or, not */
44
43
#include <dirent.h> /* struct dirent, scandirat() */
76
75
#define BUFFER_SIZE 256
77
76
78
77
#define PDIR "/lib/mandos/plugins.d"
78
#define PHDIR "/lib/mandos/plugin-helpers"
79
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
80
81
81
const char *argp_program_version = "plugin-runner " VERSION;
347
347
348
348
int main(int argc, char *argv[]){
349
349
char *plugindir = NULL;
350
char *pluginhelperdir = NULL;
350
351
char *argfile = NULL;
351
352
FILE *conffp;
352
353
struct dirent **direntries = NULL;
414
415
.doc = "Group ID the plugins will run as", .group = 3 },
415
416
{ .name = "debug", .key = 132,
416
417
.doc = "Debug mode", .group = 4 },
418
{ .name = "plugin-helper-dir", .key = 133,
419
.arg = "DIRECTORY",
420
.doc = "Specify a different plugin helper directory",
421
.group = 2 },
417
422
/*
418
423
* These reproduce what we would get without ARGP_NO_HELP
419
424
*/
545
550
case 132: /* --debug */
546
551
debug = true;
547
552
break;
553
case 133: /* --plugin-helper-dir */
554
free(pluginhelperdir);
555
pluginhelperdir = strdup(arg);
556
if(pluginhelperdir != NULL){
557
errno = 0;
558
}
559
break;
548
560
/*
549
561
* These reproduce what we would get without ARGP_NO_HELP
550
562
*/
601
613
case 130: /* --userid */
602
614
case 131: /* --groupid */
603
615
case 132: /* --debug */
616
case 133: /* --plugin-helper-dir */
604
617
case '?': /* --help */
605
618
case -3: /* --usage */
606
619
case 'V': /* --version */
687
700
custom_argc += 1;
688
701
{
689
702
char **new_argv = realloc(custom_argv, sizeof(char *)
690
* ((unsigned int)
691
custom_argc + 1));
703
* ((size_t)custom_argc + 1));
692
704
if(new_argv == NULL){
693
705
error(0, errno, "realloc");
694
706
exitstatus = EX_OSERR;
761
773
goto fallback;
762
774
}
763
775
776
{
777
char *pluginhelperenv;
778
bool bret = true;
779
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
780
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
781
if(ret != -1){
782
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
783
}
784
if(ret == -1 or not bret){
785
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
786
" environment variable to \"%s\" for all plugins\n",
787
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
788
}
789
if(ret != -1){
790
free(pluginhelperenv);
791
}
792
}
793
764
794
if(debug){
765
795
for(plugin *p = plugin_list; p != NULL; p=p->next){
766
796
fprintf(stderr, "Plugin: %s has %d arguments\n",
777
807
778
808
if(getuid() == 0){
779
809
/* Work around Debian bug #633582:
780
<http://bugs.debian.org/633582> */
810
<https://bugs.debian.org/633582> */
781
811
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
782
812
if(plugindir_fd == -1){
783
813
if(errno != ENOENT){
795
825
}
796
826
}
797
827
}
798
TEMP_FAILURE_RETRY(close(plugindir_fd));
828
close(plugindir_fd);
799
829
}
800
830
}
801
831
860
890
return 1;
861
891
}
862
892
863
#ifdef __GLIBC__
864
#if __GLIBC_PREREQ(2, 15)
865
893
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
866
894
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
895
if(numplugins == -1){
876
896
error(0, errno, "Could not scan plugin dir");
877
897
direntries = NULL;
887
907
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
888
908
if(plugin_fd == -1){
889
909
error(0, errno, "Could not open plugin");
910
free(direntries[i]);
890
911
continue;
891
912
}
892
913
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
893
914
if(ret == -1){
894
915
error(0, errno, "stat");
895
TEMP_FAILURE_RETRY(close(plugin_fd));
916
close(plugin_fd);
917
free(direntries[i]);
896
918
continue;
897
919
}
898
920
906
928
plugindir != NULL ? plugindir : PDIR,
907
929
direntries[i]->d_name);
908
930
}
909
TEMP_FAILURE_RETRY(close(plugin_fd));
931
close(plugin_fd);
932
free(direntries[i]);
910
933
continue;
911
934
}
912
935
913
936
plugin *p = getplugin(direntries[i]->d_name);
914
937
if(p == NULL){
915
938
error(0, errno, "getplugin");
916
TEMP_FAILURE_RETRY(close(plugin_fd));
939
close(plugin_fd);
940
free(direntries[i]);
917
941
continue;
918
942
}
919
943
if(p->disabled){
921
945
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
922
946
direntries[i]->d_name);
923
947
}
924
TEMP_FAILURE_RETRY(close(plugin_fd));
948
close(plugin_fd);
949
free(direntries[i]);
925
950
continue;
926
951
}
927
952
{
960
985
if(ret == -1){
961
986
error(0, errno, "pipe");
962
987
exitstatus = EX_OSERR;
988
free(direntries[i]);
963
989
goto fallback;
964
990
}
965
991
if(pipefd[0] >= FD_SETSIZE){
966
992
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
967
993
FD_SETSIZE);
968
TEMP_FAILURE_RETRY(close(pipefd[0]));
969
TEMP_FAILURE_RETRY(close(pipefd[1]));
994
close(pipefd[0]);
995
close(pipefd[1]);
970
996
exitstatus = EX_OSERR;
997
free(direntries[i]);
971
998
goto fallback;
972
999
}
973
1000
#ifndef O_CLOEXEC
975
1002
ret = set_cloexec_flag(pipefd[0]);
976
1003
if(ret < 0){
977
1004
error(0, errno, "set_cloexec_flag");
978
TEMP_FAILURE_RETRY(close(pipefd[0]));
979
TEMP_FAILURE_RETRY(close(pipefd[1]));
1005
close(pipefd[0]);
1006
close(pipefd[1]);
980
1007
exitstatus = EX_OSERR;
1008
free(direntries[i]);
981
1009
goto fallback;
982
1010
}
983
1011
ret = set_cloexec_flag(pipefd[1]);
984
1012
if(ret < 0){
985
1013
error(0, errno, "set_cloexec_flag");
986
TEMP_FAILURE_RETRY(close(pipefd[0]));
987
TEMP_FAILURE_RETRY(close(pipefd[1]));
1014
close(pipefd[0]);
1015
close(pipefd[1]);
988
1016
exitstatus = EX_OSERR;
1017
free(direntries[i]);
989
1018
goto fallback;
990
1019
}
991
1020
#endif /* not O_CLOEXEC */
996
1025
if(ret < 0){
997
1026
error(0, errno, "sigprocmask");
998
1027
exitstatus = EX_OSERR;
1028
free(direntries[i]);
999
1029
goto fallback;
1000
1030
}
1001
1031
/* Starting a new process to be watched */
1007
1037
error(0, errno, "fork");
1008
1038
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1009
1039
&sigchld_action.sa_mask, NULL));
1010
TEMP_FAILURE_RETRY(close(pipefd[0]));
1011
TEMP_FAILURE_RETRY(close(pipefd[1]));
1040
close(pipefd[0]);
1041
close(pipefd[1]);
1012
1042
exitstatus = EX_OSERR;
1043
free(direntries[i]);
1013
1044
goto fallback;
1014
1045
}
1015
1046
if(pid == 0){
1041
1072
/* no return */
1042
1073
}
1043
1074
/* Parent process */
1044
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1045
pipe */
1046
TEMP_FAILURE_RETRY(close(plugin_fd));
1075
close(pipefd[1]); /* Close unused write end of pipe */
1076
close(plugin_fd);
1047
1077
plugin *new_plugin = getplugin(direntries[i]->d_name);
1048
1078
if(new_plugin == NULL){
1049
1079
error(0, errno, "getplugin");
1054
1084
error(0, errno, "sigprocmask");
1055
1085
}
1056
1086
exitstatus = EX_OSERR;
1087
free(direntries[i]);
1057
1088
goto fallback;
1058
1089
}
1090
free(direntries[i]);
1059
1091
1060
1092
new_plugin->pid = pid;
1061
1093
new_plugin->fd = pipefd[0];
1071
1103
goto fallback;
1072
1104
}
1073
1105
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
1106
FD_SET(new_plugin->fd, &rfds_all);
1088
1107
1089
1108
if(maxfd < new_plugin->fd){
1090
1109
maxfd = new_plugin->fd;
1093
1112
1094
1113
free(direntries);
1095
1114
direntries = NULL;
1096
TEMP_FAILURE_RETRY(close(dir_fd));
1115
close(dir_fd);
1097
1116
dir_fd = -1;
1098
1117
free_plugin(getplugin(NULL));
1099
1118
1139
1158
(intmax_t) (proc->pid),
1140
1159
WTERMSIG(proc->status),
1141
1160
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
1161
}
1146
1162
}
1147
1163
1148
1164
/* 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
1165
FD_CLR(proc->fd, &rfds_all);
1163
1166
1164
1167
/* Block signal while modifying process_list */
1165
1168
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1205
1208
}
1206
1209
1207
1210
/* 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
1211
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1225
1212
/* This process had nothing to say at this time */
1226
1213
proc = proc->next;
1227
1214
continue;
1297
1284
free(direntries);
1298
1285
1299
1286
if(dir_fd != -1){
1300
TEMP_FAILURE_RETRY(close(dir_fd));
1287
close(dir_fd);
1301
1288
}
1302
1289
1303
1290
/* Kill the processes */
1323
1310
free_plugin_list();
1324
1311
1325
1312
free(plugindir);
1313
free(pluginhelperdir);
1326
1314
free(argfile);
1327
1315
1328
1316
return exitstatus;
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