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- Committer: Teddy Hogeborn
- Date: 2019-07-30 19:27:59 UTC
- mfrom: (237.4.116 release)
- Revision ID: teddy@recompile.se-20190730192759-hvvvlvdi5c5tkob9
Merge from release branch
- files added:
- bugs.xml
- debian/tests
- dracut-module
- plugin-helpers
- files removed:
- initramfs-tools-hook-conf
- files modified:
- .bzrignore
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
#if __GNUC__ >= 7
590
__attribute__((fallthrough));
591
#else
592
/* FALLTHROUGH */
593
#endif
573
594
default:
574
595
return ARGP_ERR_UNKNOWN;
575
596
}
601
622
case 130: /* --userid */
602
623
case 131: /* --groupid */
603
624
case 132: /* --debug */
625
case 133: /* --plugin-helper-dir */
604
626
case '?': /* --help */
605
627
case -3: /* --usage */
606
628
case 'V': /* --version */
687
709
custom_argc += 1;
688
710
{
689
711
char **new_argv = realloc(custom_argv, sizeof(char *)
690
* ((unsigned int)
691
custom_argc + 1));
712
* ((size_t)custom_argc + 1));
692
713
if(new_argv == NULL){
693
714
error(0, errno, "realloc");
694
715
exitstatus = EX_OSERR;
761
782
goto fallback;
762
783
}
763
784
785
{
786
char *pluginhelperenv;
787
bool bret = true;
788
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
789
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
790
if(ret != -1){
791
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
792
}
793
if(ret == -1 or not bret){
794
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
795
" environment variable to \"%s\" for all plugins\n",
796
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
797
}
798
if(ret != -1){
799
free(pluginhelperenv);
800
}
801
}
802
764
803
if(debug){
765
for(plugin *p = plugin_list; p != NULL; p=p->next){
804
for(plugin *p = plugin_list; p != NULL; p = p->next){
766
805
fprintf(stderr, "Plugin: %s has %d arguments\n",
767
806
p->name ? p->name : "Global", p->argc - 1);
768
807
for(char **a = p->argv; *a != NULL; a++){
777
816
778
817
if(getuid() == 0){
779
818
/* Work around Debian bug #633582:
780
<http://bugs.debian.org/633582> */
819
<https://bugs.debian.org/633582> */
781
820
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
782
821
if(plugindir_fd == -1){
783
822
if(errno != ENOENT){
795
834
}
796
835
}
797
836
}
798
TEMP_FAILURE_RETRY(close(plugindir_fd));
837
close(plugindir_fd);
799
838
}
800
839
}
801
840
860
899
return 1;
861
900
}
862
901
863
#ifdef __GLIBC__
864
#if __GLIBC_PREREQ(2, 15)
865
902
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
866
903
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
904
if(numplugins == -1){
876
905
error(0, errno, "Could not scan plugin dir");
877
906
direntries = NULL;
893
922
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
894
923
if(ret == -1){
895
924
error(0, errno, "stat");
896
TEMP_FAILURE_RETRY(close(plugin_fd));
925
close(plugin_fd);
897
926
free(direntries[i]);
898
927
continue;
899
928
}
908
937
plugindir != NULL ? plugindir : PDIR,
909
938
direntries[i]->d_name);
910
939
}
911
TEMP_FAILURE_RETRY(close(plugin_fd));
940
close(plugin_fd);
912
941
free(direntries[i]);
913
942
continue;
914
943
}
916
945
plugin *p = getplugin(direntries[i]->d_name);
917
946
if(p == NULL){
918
947
error(0, errno, "getplugin");
919
TEMP_FAILURE_RETRY(close(plugin_fd));
948
close(plugin_fd);
920
949
free(direntries[i]);
921
950
continue;
922
951
}
925
954
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
926
955
direntries[i]->d_name);
927
956
}
928
TEMP_FAILURE_RETRY(close(plugin_fd));
957
close(plugin_fd);
929
958
free(direntries[i]);
930
959
continue;
931
960
}
971
1000
if(pipefd[0] >= FD_SETSIZE){
972
1001
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
973
1002
FD_SETSIZE);
974
TEMP_FAILURE_RETRY(close(pipefd[0]));
975
TEMP_FAILURE_RETRY(close(pipefd[1]));
1003
close(pipefd[0]);
1004
close(pipefd[1]);
976
1005
exitstatus = EX_OSERR;
977
1006
free(direntries[i]);
978
1007
goto fallback;
982
1011
ret = set_cloexec_flag(pipefd[0]);
983
1012
if(ret < 0){
984
1013
error(0, errno, "set_cloexec_flag");
985
TEMP_FAILURE_RETRY(close(pipefd[0]));
986
TEMP_FAILURE_RETRY(close(pipefd[1]));
1014
close(pipefd[0]);
1015
close(pipefd[1]);
987
1016
exitstatus = EX_OSERR;
988
1017
free(direntries[i]);
989
1018
goto fallback;
991
1020
ret = set_cloexec_flag(pipefd[1]);
992
1021
if(ret < 0){
993
1022
error(0, errno, "set_cloexec_flag");
994
TEMP_FAILURE_RETRY(close(pipefd[0]));
995
TEMP_FAILURE_RETRY(close(pipefd[1]));
1023
close(pipefd[0]);
1024
close(pipefd[1]);
996
1025
exitstatus = EX_OSERR;
997
1026
free(direntries[i]);
998
1027
goto fallback;
1017
1046
error(0, errno, "fork");
1018
1047
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1019
1048
&sigchld_action.sa_mask, NULL));
1020
TEMP_FAILURE_RETRY(close(pipefd[0]));
1021
TEMP_FAILURE_RETRY(close(pipefd[1]));
1049
close(pipefd[0]);
1050
close(pipefd[1]);
1022
1051
exitstatus = EX_OSERR;
1023
1052
free(direntries[i]);
1024
1053
goto fallback;
1052
1081
/* no return */
1053
1082
}
1054
1083
/* Parent process */
1055
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1056
pipe */
1057
TEMP_FAILURE_RETRY(close(plugin_fd));
1084
close(pipefd[1]); /* Close unused write end of pipe */
1085
close(plugin_fd);
1058
1086
plugin *new_plugin = getplugin(direntries[i]->d_name);
1059
1087
if(new_plugin == NULL){
1060
1088
error(0, errno, "getplugin");
1072
1100
1073
1101
new_plugin->pid = pid;
1074
1102
new_plugin->fd = pipefd[0];
1075
1103
1104
if(debug){
1105
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1106
new_plugin->name, (intmax_t) (new_plugin->pid));
1107
}
1108
1076
1109
/* Unblock SIGCHLD so signal handler can be run if this process
1077
1110
has already completed */
1078
1111
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1084
1117
goto fallback;
1085
1118
}
1086
1119
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
1120
FD_SET(new_plugin->fd, &rfds_all);
1101
1121
1102
1122
if(maxfd < new_plugin->fd){
1103
1123
maxfd = new_plugin->fd;
1106
1126
1107
1127
free(direntries);
1108
1128
direntries = NULL;
1109
TEMP_FAILURE_RETRY(close(dir_fd));
1129
close(dir_fd);
1110
1130
dir_fd = -1;
1111
1131
free_plugin(getplugin(NULL));
1112
1132
1152
1172
(intmax_t) (proc->pid),
1153
1173
WTERMSIG(proc->status),
1154
1174
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));
1158
1175
}
1159
1176
}
1160
1177
1161
1178
/* Remove the plugin */
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
1179
FD_CLR(proc->fd, &rfds_all);
1176
1180
1177
1181
/* Block signal while modifying process_list */
1178
1182
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1218
1222
}
1219
1223
1220
1224
/* This process has not completed. Does it have any output? */
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
1225
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1238
1226
/* This process had nothing to say at this time */
1239
1227
proc = proc->next;
1240
1228
continue;
1310
1298
free(direntries);
1311
1299
1312
1300
if(dir_fd != -1){
1313
TEMP_FAILURE_RETRY(close(dir_fd));
1301
close(dir_fd);
1314
1302
}
1315
1303
1316
1304
/* Kill the processes */
1336
1324
free_plugin_list();
1337
1325
1338
1326
free(plugindir);
1327
free(pluginhelperdir);
1339
1328
free(argfile);
1340
1329
1341
1330
return exitstatus;
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