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- Committer: Teddy Hogeborn
- Date: 2019-04-09 19:41:53 UTC
- mfrom: (1099 trunk)
- mto: This revision was merged to the branch mainline in revision 1100.
- Revision ID: teddy@recompile.se-20190409194153-khftfvj3ee27md1a
Merge from trunk
- files added:
- bugs.xml
- plugin-helpers
- files removed:
- initramfs-tools-hook-conf
- files modified:
- DBUS-API
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;
312
313
__attribute__((nonnull))
313
314
static void free_plugin(plugin *plugin_node){
314
315
315
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
316
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
316
317
free(*arg);
317
318
}
319
free(plugin_node->name);
318
320
free(plugin_node->argv);
319
321
for(char **env = plugin_node->environ; *env != NULL; env++){
320
322
free(*env);
347
349
348
350
int main(int argc, char *argv[]){
349
351
char *plugindir = NULL;
352
char *pluginhelperdir = NULL;
350
353
char *argfile = NULL;
351
354
FILE *conffp;
352
355
struct dirent **direntries = NULL;
414
417
.doc = "Group ID the plugins will run as", .group = 3 },
415
418
{ .name = "debug", .key = 132,
416
419
.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 },
417
424
/*
418
425
* These reproduce what we would get without ARGP_NO_HELP
419
426
*/
545
552
case 132: /* --debug */
546
553
debug = true;
547
554
break;
555
case 133: /* --plugin-helper-dir */
556
free(pluginhelperdir);
557
pluginhelperdir = strdup(arg);
558
if(pluginhelperdir != NULL){
559
errno = 0;
560
}
561
break;
548
562
/*
549
563
* These reproduce what we would get without ARGP_NO_HELP
550
564
*/
551
565
case '?': /* --help */
552
566
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
553
567
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
568
__builtin_unreachable();
554
569
case -3: /* --usage */
555
570
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
556
571
argp_state_help(state, state->out_stream,
557
572
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
573
__builtin_unreachable();
558
574
case 'V': /* --version */
559
575
fprintf(state->out_stream, "%s\n", argp_program_version);
560
576
exit(EXIT_SUCCESS);
570
586
if(arg[0] == '\0'){
571
587
break;
572
588
}
589
/* FALLTHROUGH */
573
590
default:
574
591
return ARGP_ERR_UNKNOWN;
575
592
}
601
618
case 130: /* --userid */
602
619
case 131: /* --groupid */
603
620
case 132: /* --debug */
621
case 133: /* --plugin-helper-dir */
604
622
case '?': /* --help */
605
623
case -3: /* --usage */
606
624
case 'V': /* --version */
687
705
custom_argc += 1;
688
706
{
689
707
char **new_argv = realloc(custom_argv, sizeof(char *)
690
* ((unsigned int)
691
custom_argc + 1));
708
* ((size_t)custom_argc + 1));
692
709
if(new_argv == NULL){
693
710
error(0, errno, "realloc");
694
711
exitstatus = EX_OSERR;
761
778
goto fallback;
762
779
}
763
780
781
{
782
char *pluginhelperenv;
783
bool bret = true;
784
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
785
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
786
if(ret != -1){
787
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
788
}
789
if(ret == -1 or not bret){
790
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
791
" environment variable to \"%s\" for all plugins\n",
792
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
793
}
794
if(ret != -1){
795
free(pluginhelperenv);
796
}
797
}
798
764
799
if(debug){
765
for(plugin *p = plugin_list; p != NULL; p=p->next){
800
for(plugin *p = plugin_list; p != NULL; p = p->next){
766
801
fprintf(stderr, "Plugin: %s has %d arguments\n",
767
802
p->name ? p->name : "Global", p->argc - 1);
768
803
for(char **a = p->argv; *a != NULL; a++){
777
812
778
813
if(getuid() == 0){
779
814
/* Work around Debian bug #633582:
780
<http://bugs.debian.org/633582> */
815
<https://bugs.debian.org/633582> */
781
816
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
782
817
if(plugindir_fd == -1){
783
818
if(errno != ENOENT){
795
830
}
796
831
}
797
832
}
798
TEMP_FAILURE_RETRY(close(plugindir_fd));
833
close(plugindir_fd);
799
834
}
800
835
}
801
836
860
895
return 1;
861
896
}
862
897
863
#ifdef __GLIBC__
864
#if __GLIBC_PREREQ(2, 15)
865
898
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
866
899
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
900
if(numplugins == -1){
876
901
error(0, errno, "Could not scan plugin dir");
877
902
direntries = NULL;
887
912
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
888
913
if(plugin_fd == -1){
889
914
error(0, errno, "Could not open plugin");
915
free(direntries[i]);
890
916
continue;
891
917
}
892
918
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
893
919
if(ret == -1){
894
920
error(0, errno, "stat");
895
TEMP_FAILURE_RETRY(close(plugin_fd));
921
close(plugin_fd);
922
free(direntries[i]);
896
923
continue;
897
924
}
898
925
906
933
plugindir != NULL ? plugindir : PDIR,
907
934
direntries[i]->d_name);
908
935
}
909
TEMP_FAILURE_RETRY(close(plugin_fd));
936
close(plugin_fd);
937
free(direntries[i]);
910
938
continue;
911
939
}
912
940
913
941
plugin *p = getplugin(direntries[i]->d_name);
914
942
if(p == NULL){
915
943
error(0, errno, "getplugin");
916
TEMP_FAILURE_RETRY(close(plugin_fd));
944
close(plugin_fd);
945
free(direntries[i]);
917
946
continue;
918
947
}
919
948
if(p->disabled){
921
950
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
922
951
direntries[i]->d_name);
923
952
}
924
TEMP_FAILURE_RETRY(close(plugin_fd));
953
close(plugin_fd);
954
free(direntries[i]);
925
955
continue;
926
956
}
927
957
{
960
990
if(ret == -1){
961
991
error(0, errno, "pipe");
962
992
exitstatus = EX_OSERR;
993
free(direntries[i]);
963
994
goto fallback;
964
995
}
965
996
if(pipefd[0] >= FD_SETSIZE){
966
997
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
967
998
FD_SETSIZE);
968
TEMP_FAILURE_RETRY(close(pipefd[0]));
969
TEMP_FAILURE_RETRY(close(pipefd[1]));
999
close(pipefd[0]);
1000
close(pipefd[1]);
970
1001
exitstatus = EX_OSERR;
1002
free(direntries[i]);
971
1003
goto fallback;
972
1004
}
973
1005
#ifndef O_CLOEXEC
975
1007
ret = set_cloexec_flag(pipefd[0]);
976
1008
if(ret < 0){
977
1009
error(0, errno, "set_cloexec_flag");
978
TEMP_FAILURE_RETRY(close(pipefd[0]));
979
TEMP_FAILURE_RETRY(close(pipefd[1]));
1010
close(pipefd[0]);
1011
close(pipefd[1]);
980
1012
exitstatus = EX_OSERR;
1013
free(direntries[i]);
981
1014
goto fallback;
982
1015
}
983
1016
ret = set_cloexec_flag(pipefd[1]);
984
1017
if(ret < 0){
985
1018
error(0, errno, "set_cloexec_flag");
986
TEMP_FAILURE_RETRY(close(pipefd[0]));
987
TEMP_FAILURE_RETRY(close(pipefd[1]));
1019
close(pipefd[0]);
1020
close(pipefd[1]);
988
1021
exitstatus = EX_OSERR;
1022
free(direntries[i]);
989
1023
goto fallback;
990
1024
}
991
1025
#endif /* not O_CLOEXEC */
996
1030
if(ret < 0){
997
1031
error(0, errno, "sigprocmask");
998
1032
exitstatus = EX_OSERR;
1033
free(direntries[i]);
999
1034
goto fallback;
1000
1035
}
1001
1036
/* Starting a new process to be watched */
1007
1042
error(0, errno, "fork");
1008
1043
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1009
1044
&sigchld_action.sa_mask, NULL));
1010
TEMP_FAILURE_RETRY(close(pipefd[0]));
1011
TEMP_FAILURE_RETRY(close(pipefd[1]));
1045
close(pipefd[0]);
1046
close(pipefd[1]);
1012
1047
exitstatus = EX_OSERR;
1048
free(direntries[i]);
1013
1049
goto fallback;
1014
1050
}
1015
1051
if(pid == 0){
1041
1077
/* no return */
1042
1078
}
1043
1079
/* Parent process */
1044
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1045
pipe */
1046
TEMP_FAILURE_RETRY(close(plugin_fd));
1080
close(pipefd[1]); /* Close unused write end of pipe */
1081
close(plugin_fd);
1047
1082
plugin *new_plugin = getplugin(direntries[i]->d_name);
1048
1083
if(new_plugin == NULL){
1049
1084
error(0, errno, "getplugin");
1054
1089
error(0, errno, "sigprocmask");
1055
1090
}
1056
1091
exitstatus = EX_OSERR;
1092
free(direntries[i]);
1057
1093
goto fallback;
1058
1094
}
1095
free(direntries[i]);
1059
1096
1060
1097
new_plugin->pid = pid;
1061
1098
new_plugin->fd = pipefd[0];
1062
1099
1100
if(debug){
1101
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1102
new_plugin->name, (intmax_t) (new_plugin->pid));
1103
}
1104
1063
1105
/* Unblock SIGCHLD so signal handler can be run if this process
1064
1106
has already completed */
1065
1107
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1071
1113
goto fallback;
1072
1114
}
1073
1115
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
1116
FD_SET(new_plugin->fd, &rfds_all);
1088
1117
1089
1118
if(maxfd < new_plugin->fd){
1090
1119
maxfd = new_plugin->fd;
1093
1122
1094
1123
free(direntries);
1095
1124
direntries = NULL;
1096
TEMP_FAILURE_RETRY(close(dir_fd));
1125
close(dir_fd);
1097
1126
dir_fd = -1;
1098
1127
free_plugin(getplugin(NULL));
1099
1128
1139
1168
(intmax_t) (proc->pid),
1140
1169
WTERMSIG(proc->status),
1141
1170
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
1171
}
1146
1172
}
1147
1173
1148
1174
/* 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
1175
FD_CLR(proc->fd, &rfds_all);
1163
1176
1164
1177
/* Block signal while modifying process_list */
1165
1178
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1205
1218
}
1206
1219
1207
1220
/* 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
1221
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1225
1222
/* This process had nothing to say at this time */
1226
1223
proc = proc->next;
1227
1224
continue;
1297
1294
free(direntries);
1298
1295
1299
1296
if(dir_fd != -1){
1300
TEMP_FAILURE_RETRY(close(dir_fd));
1297
close(dir_fd);
1301
1298
}
1302
1299
1303
1300
/* Kill the processes */
1323
1320
free_plugin_list();
1324
1321
1325
1322
free(plugindir);
1323
free(pluginhelperdir);
1326
1324
free(argfile);
1327
1325
1328
1326
return exitstatus;
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Version: 2.0.2.dev0