3
3
* Mandos plugin runner - Run Mandos plugins
5
* Copyright © 2008-2018 Teddy Hogeborn
6
* Copyright © 2008-2018 Björn Påhlsson
8
* This file is part of Mandos.
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.
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
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.
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.
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/>.
23
22
* Contact the authors at <mandos@recompile.se>.
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(),
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() */
313
312
__attribute__((nonnull))
314
313
static void free_plugin(plugin *plugin_node){
316
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
315
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
319
free(plugin_node->name);
320
318
free(plugin_node->argv);
321
319
for(char **env = plugin_node->environ; *env != NULL; env++){
350
348
int main(int argc, char *argv[]){
351
349
char *plugindir = NULL;
352
char *pluginhelperdir = NULL;
353
350
char *argfile = NULL;
355
struct dirent **direntries = NULL;
352
struct dirent **direntries;
358
355
int ret, maxfd = 0;
417
414
.doc = "Group ID the plugins will run as", .group = 3 },
418
415
{ .name = "debug", .key = 132,
419
416
.doc = "Debug mode", .group = 4 },
420
{ .name = "plugin-helper-dir", .key = 133,
422
.doc = "Specify a different plugin helper directory",
425
418
* These reproduce what we would get without ARGP_NO_HELP
552
545
case 132: /* --debug */
555
case 133: /* --plugin-helper-dir */
556
free(pluginhelperdir);
557
pluginhelperdir = strdup(arg);
558
if(pluginhelperdir != NULL){
563
549
* These reproduce what we would get without ARGP_NO_HELP
565
551
case '?': /* --help */
566
552
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
567
553
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
568
__builtin_unreachable();
569
554
case -3: /* --usage */
570
555
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
571
556
argp_state_help(state, state->out_stream,
572
557
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
573
__builtin_unreachable();
574
558
case 'V': /* --version */
575
559
fprintf(state->out_stream, "%s\n", argp_program_version);
576
560
exit(EXIT_SUCCESS);
709
687
custom_argc += 1;
711
689
char **new_argv = realloc(custom_argv, sizeof(char *)
712
* ((size_t)custom_argc + 1));
713
692
if(new_argv == NULL){
714
693
error(0, errno, "realloc");
715
694
exitstatus = EX_OSERR;
786
char *pluginhelperenv;
788
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
789
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
791
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
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);
799
free(pluginhelperenv);
804
for(plugin *p = plugin_list; p != NULL; p = p->next){
765
for(plugin *p = plugin_list; p != NULL; p=p->next){
805
766
fprintf(stderr, "Plugin: %s has %d arguments\n",
806
767
p->name ? p->name : "Global", p->argc - 1);
807
768
for(char **a = p->argv; *a != NULL; a++){
817
778
if(getuid() == 0){
818
779
/* Work around Debian bug #633582:
819
<https://bugs.debian.org/633582> */
780
<http://bugs.debian.org/633582> */
820
781
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
821
782
if(plugindir_fd == -1){
822
783
if(errno != ENOENT){
865
#if __GLIBC_PREREQ(2, 15)
902
866
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
868
#else /* not __GLIBC_PREREQ(2, 15) */
869
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
870
&direntries, good_name, alphasort);
871
#endif /* not __GLIBC_PREREQ(2, 15) */
872
#else /* not __GLIBC__ */
873
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
874
&direntries, good_name, alphasort);
875
#endif /* not __GLIBC__ */
904
876
if(numplugins == -1){
905
877
error(0, errno, "Could not scan plugin dir");
878
TEMP_FAILURE_RETRY(close(dir_fd));
907
879
exitstatus = EX_OSERR;
916
888
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
917
889
if(plugin_fd == -1){
918
890
error(0, errno, "Could not open plugin");
922
893
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
924
895
error(0, errno, "stat");
896
TEMP_FAILURE_RETRY(close(plugin_fd));
937
907
plugindir != NULL ? plugindir : PDIR,
938
908
direntries[i]->d_name);
910
TEMP_FAILURE_RETRY(close(plugin_fd));
945
914
plugin *p = getplugin(direntries[i]->d_name);
947
916
error(0, errno, "getplugin");
917
TEMP_FAILURE_RETRY(close(plugin_fd));
995
962
error(0, errno, "pipe");
996
963
exitstatus = EX_OSERR;
1000
966
if(pipefd[0] >= FD_SETSIZE){
1001
967
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
969
TEMP_FAILURE_RETRY(close(pipefd[0]));
970
TEMP_FAILURE_RETRY(close(pipefd[1]));
1005
971
exitstatus = EX_OSERR;
1006
free(direntries[i]);
1009
974
#ifndef O_CLOEXEC
1011
976
ret = set_cloexec_flag(pipefd[0]);
1013
978
error(0, errno, "set_cloexec_flag");
979
TEMP_FAILURE_RETRY(close(pipefd[0]));
980
TEMP_FAILURE_RETRY(close(pipefd[1]));
1016
981
exitstatus = EX_OSERR;
1017
free(direntries[i]);
1020
984
ret = set_cloexec_flag(pipefd[1]);
1022
986
error(0, errno, "set_cloexec_flag");
987
TEMP_FAILURE_RETRY(close(pipefd[0]));
988
TEMP_FAILURE_RETRY(close(pipefd[1]));
1025
989
exitstatus = EX_OSERR;
1026
free(direntries[i]);
1029
992
#endif /* not O_CLOEXEC */
1046
1008
error(0, errno, "fork");
1047
1009
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1048
1010
&sigchld_action.sa_mask, NULL));
1011
TEMP_FAILURE_RETRY(close(pipefd[0]));
1012
TEMP_FAILURE_RETRY(close(pipefd[1]));
1051
1013
exitstatus = EX_OSERR;
1052
free(direntries[i]);
1081
1042
/* no return */
1083
1044
/* Parent process */
1084
close(pipefd[1]); /* Close unused write end of pipe */
1045
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1047
TEMP_FAILURE_RETRY(close(plugin_fd));
1086
1048
plugin *new_plugin = getplugin(direntries[i]->d_name);
1087
1049
if(new_plugin == NULL){
1088
1050
error(0, errno, "getplugin");
1093
1055
error(0, errno, "sigprocmask");
1095
1057
exitstatus = EX_OSERR;
1096
free(direntries[i]);
1099
free(direntries[i]);
1101
1061
new_plugin->pid = pid;
1102
1062
new_plugin->fd = pipefd[0];
1105
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1106
new_plugin->name, (intmax_t) (new_plugin->pid));
1109
1064
/* Unblock SIGCHLD so signal handler can be run if this process
1110
1065
has already completed */
1111
1066
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1120
FD_SET(new_plugin->fd, &rfds_all);
1075
#if defined (__GNUC__) and defined (__GLIBC__)
1076
#if not __GLIBC_PREREQ(2, 16)
1077
#pragma GCC diagnostic push
1078
#pragma GCC diagnostic ignored "-Wsign-conversion"
1081
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1082
-Wconversion in GNU libc
1084
#if defined (__GNUC__) and defined (__GLIBC__)
1085
#if not __GLIBC_PREREQ(2, 16)
1086
#pragma GCC diagnostic pop
1122
1090
if(maxfd < new_plugin->fd){
1123
1091
maxfd = new_plugin->fd;
1095
TEMP_FAILURE_RETRY(close(dir_fd));
1131
1096
free_plugin(getplugin(NULL));
1133
1098
for(plugin *p = plugin_list; p != NULL; p = p->next){
1172
1137
(intmax_t) (proc->pid),
1173
1138
WTERMSIG(proc->status),
1174
1139
strsignal(WTERMSIG(proc->status)));
1140
} else if(WCOREDUMP(proc->status)){
1141
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1142
" core\n", proc->name, (intmax_t) (proc->pid));
1178
1146
/* Remove the plugin */
1179
FD_CLR(proc->fd, &rfds_all);
1147
#if defined (__GNUC__) and defined (__GLIBC__)
1148
#if not __GLIBC_PREREQ(2, 16)
1149
#pragma GCC diagnostic push
1150
#pragma GCC diagnostic ignored "-Wsign-conversion"
1153
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1154
-Wconversion in GNU libc
1156
#if defined (__GNUC__) and defined (__GLIBC__)
1157
#if not __GLIBC_PREREQ(2, 16)
1158
#pragma GCC diagnostic pop
1181
1162
/* Block signal while modifying process_list */
1182
1163
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1224
1205
/* This process has not completed. Does it have any output? */
1225
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1206
#if defined (__GNUC__) and defined (__GLIBC__)
1207
#if not __GLIBC_PREREQ(2, 16)
1208
#pragma GCC diagnostic push
1209
#pragma GCC diagnostic ignored "-Wsign-conversion"
1212
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1218
#if defined (__GNUC__) and defined (__GLIBC__)
1219
#if not __GLIBC_PREREQ(2, 16)
1220
#pragma GCC diagnostic pop
1226
1223
/* This process had nothing to say at this time */
1227
1224
proc = proc->next;
added
removed
plugin-runner.c
