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- Committer: Teddy Hogeborn
- Date: 2014-10-05 19:39:25 UTC
- Revision ID: teddy@recompile.se-20141005193925-jjqx2n2dt3icy28u
* mandos.service ([Unit]/Documentation): New.
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;
348
347
349
348
int main(int argc, char *argv[]){
350
349
char *plugindir = NULL;
351
char *pluginhelperdir = NULL;
352
350
char *argfile = NULL;
353
351
FILE *conffp;
354
352
struct dirent **direntries = NULL;
416
414
.doc = "Group ID the plugins will run as", .group = 3 },
417
415
{ .name = "debug", .key = 132,
418
416
.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 },
423
417
/*
424
418
* These reproduce what we would get without ARGP_NO_HELP
425
419
*/
551
545
case 132: /* --debug */
552
546
debug = true;
553
547
break;
554
case 133: /* --plugin-helper-dir */
555
free(pluginhelperdir);
556
pluginhelperdir = strdup(arg);
557
if(pluginhelperdir != NULL){
558
errno = 0;
559
}
560
break;
561
548
/*
562
549
* These reproduce what we would get without ARGP_NO_HELP
563
550
*/
614
601
case 130: /* --userid */
615
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case 131: /* --groupid */
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case 132: /* --debug */
617
case 133: /* --plugin-helper-dir */
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case '?': /* --help */
619
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case -3: /* --usage */
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case 'V': /* --version */
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custom_argc += 1;
702
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{
703
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char **new_argv = realloc(custom_argv, sizeof(char *)
704
* ((size_t)custom_argc + 1));
690
* ((unsigned int)
691
custom_argc + 1));
705
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if(new_argv == NULL){
706
693
error(0, errno, "realloc");
707
694
exitstatus = EX_OSERR;
774
761
goto fallback;
775
762
}
776
763
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
795
764
if(debug){
796
for(plugin *p = plugin_list; p != NULL; p = p->next){
765
for(plugin *p = plugin_list; p != NULL; p=p->next){
797
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fprintf(stderr, "Plugin: %s has %d arguments\n",
798
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p->name ? p->name : "Global", p->argc - 1);
799
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for(char **a = p->argv; *a != NULL; a++){
808
777
809
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if(getuid() == 0){
810
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/* Work around Debian bug #633582:
811
<https://bugs.debian.org/633582> */
780
<http://bugs.debian.org/633582> */
812
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int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
813
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if(plugindir_fd == -1){
814
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if(errno != ENOENT){
826
795
}
827
796
}
828
797
}
829
close(plugindir_fd);
798
TEMP_FAILURE_RETRY(close(plugindir_fd));
830
799
}
831
800
}
832
801
891
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return 1;
892
861
}
893
862
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#ifdef __GLIBC__
864
#if __GLIBC_PREREQ(2, 15)
894
865
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
895
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__ */
896
875
if(numplugins == -1){
897
876
error(0, errno, "Could not scan plugin dir");
898
877
direntries = NULL;
914
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ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
915
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if(ret == -1){
916
895
error(0, errno, "stat");
917
close(plugin_fd);
896
TEMP_FAILURE_RETRY(close(plugin_fd));
918
897
free(direntries[i]);
919
898
continue;
920
899
}
929
908
plugindir != NULL ? plugindir : PDIR,
930
909
direntries[i]->d_name);
931
910
}
932
close(plugin_fd);
911
TEMP_FAILURE_RETRY(close(plugin_fd));
933
912
free(direntries[i]);
934
913
continue;
935
914
}
937
916
plugin *p = getplugin(direntries[i]->d_name);
938
917
if(p == NULL){
939
918
error(0, errno, "getplugin");
940
close(plugin_fd);
919
TEMP_FAILURE_RETRY(close(plugin_fd));
941
920
free(direntries[i]);
942
921
continue;
943
922
}
946
925
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
947
926
direntries[i]->d_name);
948
927
}
949
close(plugin_fd);
928
TEMP_FAILURE_RETRY(close(plugin_fd));
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929
free(direntries[i]);
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930
continue;
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931
}
992
971
if(pipefd[0] >= FD_SETSIZE){
993
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fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
994
973
FD_SETSIZE);
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close(pipefd[0]);
996
close(pipefd[1]);
974
TEMP_FAILURE_RETRY(close(pipefd[0]));
975
TEMP_FAILURE_RETRY(close(pipefd[1]));
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976
exitstatus = EX_OSERR;
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977
free(direntries[i]);
999
978
goto fallback;
1003
982
ret = set_cloexec_flag(pipefd[0]);
1004
983
if(ret < 0){
1005
984
error(0, errno, "set_cloexec_flag");
1006
close(pipefd[0]);
1007
close(pipefd[1]);
985
TEMP_FAILURE_RETRY(close(pipefd[0]));
986
TEMP_FAILURE_RETRY(close(pipefd[1]));
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987
exitstatus = EX_OSERR;
1009
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free(direntries[i]);
1010
989
goto fallback;
1012
991
ret = set_cloexec_flag(pipefd[1]);
1013
992
if(ret < 0){
1014
993
error(0, errno, "set_cloexec_flag");
1015
close(pipefd[0]);
1016
close(pipefd[1]);
994
TEMP_FAILURE_RETRY(close(pipefd[0]));
995
TEMP_FAILURE_RETRY(close(pipefd[1]));
1017
996
exitstatus = EX_OSERR;
1018
997
free(direntries[i]);
1019
998
goto fallback;
1038
1017
error(0, errno, "fork");
1039
1018
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1040
1019
&sigchld_action.sa_mask, NULL));
1041
close(pipefd[0]);
1042
close(pipefd[1]);
1020
TEMP_FAILURE_RETRY(close(pipefd[0]));
1021
TEMP_FAILURE_RETRY(close(pipefd[1]));
1043
1022
exitstatus = EX_OSERR;
1044
1023
free(direntries[i]);
1045
1024
goto fallback;
1073
1052
/* no return */
1074
1053
}
1075
1054
/* Parent process */
1076
close(pipefd[1]); /* Close unused write end of pipe */
1077
close(plugin_fd);
1055
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1056
pipe */
1057
TEMP_FAILURE_RETRY(close(plugin_fd));
1078
1058
plugin *new_plugin = getplugin(direntries[i]->d_name);
1079
1059
if(new_plugin == NULL){
1080
1060
error(0, errno, "getplugin");
1104
1084
goto fallback;
1105
1085
}
1106
1086
1107
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
1108
1101
1109
1102
if(maxfd < new_plugin->fd){
1110
1103
maxfd = new_plugin->fd;
1113
1106
1114
1107
free(direntries);
1115
1108
direntries = NULL;
1116
close(dir_fd);
1109
TEMP_FAILURE_RETRY(close(dir_fd));
1117
1110
dir_fd = -1;
1118
1111
free_plugin(getplugin(NULL));
1119
1112
1159
1152
(intmax_t) (proc->pid),
1160
1153
WTERMSIG(proc->status),
1161
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));
1162
1158
}
1163
1159
}
1164
1160
1165
1161
/* Remove the plugin */
1166
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
1167
1176
1168
1177
/* Block signal while modifying process_list */
1169
1178
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1209
1218
}
1210
1219
1211
1220
/* This process has not completed. Does it have any output? */
1212
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
1213
1238
/* This process had nothing to say at this time */
1214
1239
proc = proc->next;
1215
1240
continue;
1285
1310
free(direntries);
1286
1311
1287
1312
if(dir_fd != -1){
1288
close(dir_fd);
1313
TEMP_FAILURE_RETRY(close(dir_fd));
1289
1314
}
1290
1315
1291
1316
/* Kill the processes */
1311
1336
free_plugin_list();
1312
1337
1313
1338
free(plugindir);
1314
free(pluginhelperdir);
1315
1339
free(argfile);
1316
1340
1317
1341
return exitstatus;
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