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- Committer: Teddy Hogeborn
- Date: 2015-05-23 12:07:07 UTC
- Revision ID: teddy@recompile.se-20150523120707-t5fq0brh2kxkvw8g
mandos: Some more minor changes to prepare for Python 3.
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008-2016 Teddy Hogeborn
6
* Copyright © 2008-2016 Björn Påhlsson
5
* Copyright © 2008-2014 Teddy Hogeborn
6
* Copyright © 2008-2014 Björn Påhlsson
7
7
*
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* This program is free software: you can redistribute it and/or
9
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* modify it under the terms of the GNU General Public License as
37
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#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
38
FD_SET(), FD_ISSET(), FD_CLR */
39
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#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS(), WTERMSIG() */
40
WEXITSTATUS(), WTERMSIG(),
41
WCOREDUMP() */
41
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#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
42
43
#include <iso646.h> /* and, or, not */
43
44
#include <dirent.h> /* struct dirent, scandirat() */
75
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#define BUFFER_SIZE 256
76
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77
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#define PDIR "/lib/mandos/plugins.d"
78
#define PHDIR "/lib/mandos/plugin-helpers"
79
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#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
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81
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const char *argp_program_version = "plugin-runner " VERSION;
347
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348
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int main(int argc, char *argv[]){
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char *plugindir = NULL;
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char *pluginhelperdir = NULL;
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char *argfile = NULL;
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FILE *conffp;
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struct dirent **direntries = NULL;
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.doc = "Group ID the plugins will run as", .group = 3 },
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{ .name = "debug", .key = 132,
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.doc = "Debug mode", .group = 4 },
418
{ .name = "plugin-helper-dir", .key = 133,
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.arg = "DIRECTORY",
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.doc = "Specify a different plugin helper directory",
421
.group = 2 },
422
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/*
423
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* These reproduce what we would get without ARGP_NO_HELP
424
419
*/
550
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case 132: /* --debug */
551
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debug = true;
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break;
553
case 133: /* --plugin-helper-dir */
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free(pluginhelperdir);
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pluginhelperdir = strdup(arg);
556
if(pluginhelperdir != NULL){
557
errno = 0;
558
}
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break;
560
548
/*
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* These reproduce what we would get without ARGP_NO_HELP
562
550
*/
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case 130: /* --userid */
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case 131: /* --groupid */
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case 132: /* --debug */
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case 133: /* --plugin-helper-dir */
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case '?': /* --help */
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case -3: /* --usage */
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case 'V': /* --version */
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custom_argc += 1;
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{
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char **new_argv = realloc(custom_argv, sizeof(char *)
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* ((size_t)custom_argc + 1));
690
* ((unsigned int)
691
custom_argc + 1));
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if(new_argv == NULL){
705
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error(0, errno, "realloc");
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exitstatus = EX_OSERR;
773
761
goto fallback;
774
762
}
775
763
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
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if(debug){
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for(plugin *p = plugin_list; p != NULL; p=p->next){
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fprintf(stderr, "Plugin: %s has %d arguments\n",
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if(getuid() == 0){
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/* Work around Debian bug #633582:
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<https://bugs.debian.org/633582> */
780
<http://bugs.debian.org/633582> */
811
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int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
812
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if(plugindir_fd == -1){
813
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if(errno != ENOENT){
825
795
}
826
796
}
827
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}
828
close(plugindir_fd);
798
TEMP_FAILURE_RETRY(close(plugindir_fd));
829
799
}
830
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}
831
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return 1;
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}
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#ifdef __GLIBC__
864
#if __GLIBC_PREREQ(2, 15)
893
865
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
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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__ */
895
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if(numplugins == -1){
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error(0, errno, "Could not scan plugin dir");
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direntries = NULL;
913
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ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
914
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if(ret == -1){
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error(0, errno, "stat");
916
close(plugin_fd);
896
TEMP_FAILURE_RETRY(close(plugin_fd));
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free(direntries[i]);
918
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continue;
919
899
}
928
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plugindir != NULL ? plugindir : PDIR,
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direntries[i]->d_name);
930
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}
931
close(plugin_fd);
911
TEMP_FAILURE_RETRY(close(plugin_fd));
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free(direntries[i]);
933
913
continue;
934
914
}
936
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plugin *p = getplugin(direntries[i]->d_name);
937
917
if(p == NULL){
938
918
error(0, errno, "getplugin");
939
close(plugin_fd);
919
TEMP_FAILURE_RETRY(close(plugin_fd));
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free(direntries[i]);
941
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continue;
942
922
}
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fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
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926
direntries[i]->d_name);
947
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}
948
close(plugin_fd);
928
TEMP_FAILURE_RETRY(close(plugin_fd));
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free(direntries[i]);
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930
continue;
951
931
}
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if(pipefd[0] >= FD_SETSIZE){
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fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
993
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FD_SETSIZE);
994
close(pipefd[0]);
995
close(pipefd[1]);
974
TEMP_FAILURE_RETRY(close(pipefd[0]));
975
TEMP_FAILURE_RETRY(close(pipefd[1]));
996
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exitstatus = EX_OSERR;
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977
free(direntries[i]);
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978
goto fallback;
1002
982
ret = set_cloexec_flag(pipefd[0]);
1003
983
if(ret < 0){
1004
984
error(0, errno, "set_cloexec_flag");
1005
close(pipefd[0]);
1006
close(pipefd[1]);
985
TEMP_FAILURE_RETRY(close(pipefd[0]));
986
TEMP_FAILURE_RETRY(close(pipefd[1]));
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exitstatus = EX_OSERR;
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free(direntries[i]);
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goto fallback;
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ret = set_cloexec_flag(pipefd[1]);
1012
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if(ret < 0){
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error(0, errno, "set_cloexec_flag");
1014
close(pipefd[0]);
1015
close(pipefd[1]);
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TEMP_FAILURE_RETRY(close(pipefd[0]));
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TEMP_FAILURE_RETRY(close(pipefd[1]));
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exitstatus = EX_OSERR;
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free(direntries[i]);
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goto fallback;
1037
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error(0, errno, "fork");
1038
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TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1039
1019
&sigchld_action.sa_mask, NULL));
1040
close(pipefd[0]);
1041
close(pipefd[1]);
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TEMP_FAILURE_RETRY(close(pipefd[0]));
1021
TEMP_FAILURE_RETRY(close(pipefd[1]));
1042
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exitstatus = EX_OSERR;
1043
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free(direntries[i]);
1044
1024
goto fallback;
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1052
/* no return */
1073
1053
}
1074
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/* Parent process */
1075
close(pipefd[1]); /* Close unused write end of pipe */
1076
close(plugin_fd);
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TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1056
pipe */
1057
TEMP_FAILURE_RETRY(close(plugin_fd));
1077
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plugin *new_plugin = getplugin(direntries[i]->d_name);
1078
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if(new_plugin == NULL){
1079
1060
error(0, errno, "getplugin");
1103
1084
goto fallback;
1104
1085
}
1105
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1106
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
1107
1101
1108
1102
if(maxfd < new_plugin->fd){
1109
1103
maxfd = new_plugin->fd;
1112
1106
1113
1107
free(direntries);
1114
1108
direntries = NULL;
1115
close(dir_fd);
1109
TEMP_FAILURE_RETRY(close(dir_fd));
1116
1110
dir_fd = -1;
1117
1111
free_plugin(getplugin(NULL));
1118
1112
1158
1152
(intmax_t) (proc->pid),
1159
1153
WTERMSIG(proc->status),
1160
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));
1161
1158
}
1162
1159
}
1163
1160
1164
1161
/* Remove the plugin */
1165
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
1166
1176
1167
1177
/* Block signal while modifying process_list */
1168
1178
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1208
1218
}
1209
1219
1210
1220
/* This process has not completed. Does it have any output? */
1211
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
1212
1238
/* This process had nothing to say at this time */
1213
1239
proc = proc->next;
1214
1240
continue;
1284
1310
free(direntries);
1285
1311
1286
1312
if(dir_fd != -1){
1287
close(dir_fd);
1313
TEMP_FAILURE_RETRY(close(dir_fd));
1288
1314
}
1289
1315
1290
1316
/* Kill the processes */
1310
1336
free_plugin_list();
1311
1337
1312
1338
free(plugindir);
1313
free(pluginhelperdir);
1314
1339
free(argfile);
1315
1340
1316
1341
return exitstatus;
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