To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 237.7.296
- compare with another revision
- download diff
- download tarball
- view history from revision 237.7.296
- Committer: Teddy Hogeborn
- Date: 2015-05-23 10:41:35 UTC
- mto: (237.7.304 trunk)
- mto: This revision was merged to the branch mainline in revision 325.
- Revision ID: teddy@recompile.se-20150523104135-s08sbkurj1wf0jrz
mandos-keygen: Update copyright year.
- files added:
- initramfs-tools-hook-conf
- files removed:
- bugs.xml
- debian/tests
- dracut-module
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008-2021 Teddy Hogeborn
6
* Copyright © 2008-2021 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
*/
25
24
26
#define _GNU_SOURCE /* strchrnul(), TEMP_FAILURE_RETRY(),
27
getline(), asprintf(), O_CLOEXEC,
28
scandirat(), pipe2() */
29
#include <argp.h> /* argp_program_version,
30
argp_program_bug_address,
31
struct argp_option,
32
struct argp_state, argp_error(),
33
ARGP_NO_EXIT, argp_state_help,
34
ARGP_HELP_STD_HELP,
35
ARGP_HELP_USAGE, ARGP_HELP_EXIT_OK,
36
ARGP_KEY_ARG, ARGP_ERR_UNKNOWN,
37
struct argp, argp_parse(),
38
ARGP_IN_ORDER, ARGP_NO_HELP */
39
#include <stdbool.h> /* bool, false, true */
40
#include <sys/types.h> /* pid_t, sig_atomic_t, uid_t, gid_t,
41
getuid(), setgid(), setuid() */
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
O_CLOEXEC, pipe2() */
42
27
#include <stddef.h> /* size_t, NULL */
43
#include <iso646.h> /* or, and, not */
44
#include <string.h> /* strcmp(), strdup(), strchrnul(),
45
strncmp(), strlen(), strcpy(),
46
strsep(), strchr(), strsignal() */
47
#include <stdlib.h> /* malloc(), free(), reallocarray(),
48
realloc(), EXIT_SUCCESS */
49
#include <errno.h> /* errno, EINTR, ENOMEM, ECHILD,
50
error_t, EINVAL, EMFILE, ENFILE,
51
ENOENT, ESRCH */
52
#include <stdint.h> /* SIZE_MAX */
53
#define _GNU_SOURCE /* strchrnul(), TEMP_FAILURE_RETRY(),
54
getline(), asprintf(), O_CLOEXEC,
55
scandirat(), pipe2() */
56
#include <unistd.h> /* TEMP_FAILURE_RETRY(), ssize_t,
57
write(), STDOUT_FILENO, uid_t,
58
gid_t, getuid(), fchown(), close(),
59
symlink(), setgid(), setuid(),
60
faccessat(), X_OK, pipe(), pipe2(),
61
fork(), _exit(), dup2(), fexecve(),
62
read(), getpass() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
34
WIFEXITED(), WEXITSTATUS(), wait(),
35
pid_t, uid_t, gid_t, getuid(),
36
getgid() */
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
FD_SET(), FD_ISSET(), FD_CLR */
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS(), WTERMSIG(),
41
WCOREDUMP() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
43
#include <iso646.h> /* and, or, not */
44
#include <dirent.h> /* struct dirent, scandirat() */
45
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
46
FD_CLOEXEC, write(), STDOUT_FILENO,
47
struct stat, fstat(), close(),
48
setgid(), setuid(), S_ISREG(),
49
faccessat() pipe2(), fork(),
50
_exit(), dup2(), fexecve(), read()
51
*/
63
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
64
FD_CLOEXEC, open(), O_RDONLY,
65
O_CLOEXEC, openat() */
66
#include <sys/wait.h> /* waitpid(), WNOHANG, WIFEXITED(),
67
WEXITSTATUS(), WIFSIGNALED(),
68
WTERMSIG(), wait() */
69
#include <error.h> /* error() */
70
#include <stdio.h> /* FILE, fprintf(), fopen(),
71
getline(), fclose(), EOF,
72
asprintf(), stderr */
73
#include <dirent.h> /* struct dirent, scandirat(),
74
alphasort() */
75
#include <sys/stat.h> /* struct stat, fstat(), S_ISDIR(),
76
lstat(), S_ISREG() */
77
#include <sys/select.h> /* fd_set, FD_ZERO(), FD_SETSIZE,
78
FD_SET(), select(), FD_CLR(),
79
FD_ISSET() */
80
#include <signal.h> /* struct sigaction, SA_NOCLDSTOP,
81
sigemptyset(), sigaddset(),
82
SIGCHLD, sigprocmask(), SIG_BLOCK,
83
SIG_UNBLOCK, kill(), SIGTERM */
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
57
#include <errno.h> /* errno */
58
#include <argp.h> /* struct argp_option, struct
59
argp_state, struct argp,
60
argp_parse(), ARGP_ERR_UNKNOWN,
61
ARGP_KEY_END, ARGP_KEY_ARG,
62
error_t */
63
#include <signal.h> /* struct sigaction, sigemptyset(),
64
sigaddset(), sigaction(),
65
sigprocmask(), SIG_BLOCK, SIGCHLD,
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
68
#include <errno.h> /* errno, EBADF */
69
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
84
70
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
85
71
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
86
#include <inttypes.h> /* intmax_t, strtoimax(), PRIdMAX */
87
#include <fnmatch.h> /* fnmatch(), FNM_FILE_NAME,
88
FNM_PERIOD, FNM_NOMATCH */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
89
75
90
76
#define BUFFER_SIZE 256
91
77
92
78
#define PDIR "/lib/mandos/plugins.d"
93
#define PHDIR "/lib/mandos/plugin-helpers"
94
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
95
80
96
81
const char *argp_program_version = "plugin-runner " VERSION;
193
178
/* Resize the pointed-to array to hold one more pointer */
194
179
char **new_array = NULL;
195
180
do {
196
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
197
new_array = reallocarray(*array, (size_t)((*len) + 2),
198
sizeof(char *));
199
#else
200
if(((size_t)((*len) + 2)) > (SIZE_MAX / sizeof(char *))){
201
/* overflow */
202
new_array = NULL;
203
errno = ENOMEM;
204
} else {
205
new_array = realloc(*array, (size_t)((*len) + 2)
206
* sizeof(char *));
207
}
208
#endif
181
new_array = realloc(*array, sizeof(char *)
182
* (size_t) ((*len) + 2));
209
183
} while(new_array == NULL and errno == EINTR);
210
184
/* Malloc check */
211
185
if(new_array == NULL){
338
312
__attribute__((nonnull))
339
313
static void free_plugin(plugin *plugin_node){
340
314
341
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
315
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
342
316
free(*arg);
343
317
}
344
free(plugin_node->name);
345
318
free(plugin_node->argv);
346
319
for(char **env = plugin_node->environ; *env != NULL; env++){
347
320
free(*env);
374
347
375
348
int main(int argc, char *argv[]){
376
349
char *plugindir = NULL;
377
char *pluginhelperdir = NULL;
378
350
char *argfile = NULL;
379
351
FILE *conffp;
380
352
struct dirent **direntries = NULL;
442
414
.doc = "Group ID the plugins will run as", .group = 3 },
443
415
{ .name = "debug", .key = 132,
444
416
.doc = "Debug mode", .group = 4 },
445
{ .name = "plugin-helper-dir", .key = 133,
446
.arg = "DIRECTORY",
447
.doc = "Specify a different plugin helper directory",
448
.group = 2 },
449
417
/*
450
418
* These reproduce what we would get without ARGP_NO_HELP
451
419
*/
577
545
case 132: /* --debug */
578
546
debug = true;
579
547
break;
580
case 133: /* --plugin-helper-dir */
581
free(pluginhelperdir);
582
pluginhelperdir = strdup(arg);
583
if(pluginhelperdir != NULL){
584
errno = 0;
585
}
586
break;
587
548
/*
588
549
* These reproduce what we would get without ARGP_NO_HELP
589
550
*/
590
551
case '?': /* --help */
591
552
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
592
553
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
593
__builtin_unreachable();
594
554
case -3: /* --usage */
595
555
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
596
556
argp_state_help(state, state->out_stream,
597
557
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
598
__builtin_unreachable();
599
558
case 'V': /* --version */
600
559
fprintf(state->out_stream, "%s\n", argp_program_version);
601
560
exit(EXIT_SUCCESS);
611
570
if(arg[0] == '\0'){
612
571
break;
613
572
}
614
#if __GNUC__ >= 7
615
__attribute__((fallthrough));
616
#else
617
/* FALLTHROUGH */
618
#endif
619
573
default:
620
574
return ARGP_ERR_UNKNOWN;
621
575
}
647
601
case 130: /* --userid */
648
602
case 131: /* --groupid */
649
603
case 132: /* --debug */
650
case 133: /* --plugin-helper-dir */
651
604
case '?': /* --help */
652
605
case -3: /* --usage */
653
606
case 'V': /* --version */
733
686
734
687
custom_argc += 1;
735
688
{
736
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
737
char **new_argv = reallocarray(custom_argv,
738
(size_t)custom_argc + 1,
739
sizeof(char *));
740
#else
741
char **new_argv = NULL;
742
if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
743
/* overflow */
744
errno = ENOMEM;
745
} else {
746
new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
747
* sizeof(char *));
748
}
749
#endif
689
char **new_argv = realloc(custom_argv, sizeof(char *)
690
* ((unsigned int)
691
custom_argc + 1));
750
692
if(new_argv == NULL){
751
error(0, errno, "reallocarray");
693
error(0, errno, "realloc");
752
694
exitstatus = EX_OSERR;
753
695
free(new_arg);
754
696
free(org_line);
819
761
goto fallback;
820
762
}
821
763
822
{
823
char *pluginhelperenv;
824
bool bret = true;
825
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
826
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
827
if(ret != -1){
828
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
829
}
830
if(ret == -1 or not bret){
831
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
832
" environment variable to \"%s\" for all plugins\n",
833
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
834
}
835
if(ret != -1){
836
free(pluginhelperenv);
837
}
838
}
839
840
764
if(debug){
841
for(plugin *p = plugin_list; p != NULL; p = p->next){
765
for(plugin *p = plugin_list; p != NULL; p=p->next){
842
766
fprintf(stderr, "Plugin: %s has %d arguments\n",
843
767
p->name ? p->name : "Global", p->argc - 1);
844
768
for(char **a = p->argv; *a != NULL; a++){
853
777
854
778
if(getuid() == 0){
855
779
/* Work around Debian bug #633582:
856
<https://bugs.debian.org/633582> */
780
<http://bugs.debian.org/633582> */
857
781
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
858
782
if(plugindir_fd == -1){
859
783
if(errno != ENOENT){
871
795
}
872
796
}
873
797
}
874
close(plugindir_fd);
875
}
876
877
/* Work around Debian bug #981302
878
<https://bugs.debian.org/981302> */
879
if(lstat("/dev/fd", &st) != 0 and errno == ENOENT){
880
ret = symlink("/proc/self/fd", "/dev/fd");
881
if(ret == -1){
882
error(0, errno, "Failed to create /dev/fd symlink");
883
}
798
TEMP_FAILURE_RETRY(close(plugindir_fd));
884
799
}
885
800
}
886
801
945
860
return 1;
946
861
}
947
862
863
#ifdef __GLIBC__
864
#if __GLIBC_PREREQ(2, 15)
948
865
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
949
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__ */
950
875
if(numplugins == -1){
951
876
error(0, errno, "Could not scan plugin dir");
952
877
direntries = NULL;
968
893
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
969
894
if(ret == -1){
970
895
error(0, errno, "stat");
971
close(plugin_fd);
896
TEMP_FAILURE_RETRY(close(plugin_fd));
972
897
free(direntries[i]);
973
898
continue;
974
899
}
983
908
plugindir != NULL ? plugindir : PDIR,
984
909
direntries[i]->d_name);
985
910
}
986
close(plugin_fd);
911
TEMP_FAILURE_RETRY(close(plugin_fd));
987
912
free(direntries[i]);
988
913
continue;
989
914
}
991
916
plugin *p = getplugin(direntries[i]->d_name);
992
917
if(p == NULL){
993
918
error(0, errno, "getplugin");
994
close(plugin_fd);
919
TEMP_FAILURE_RETRY(close(plugin_fd));
995
920
free(direntries[i]);
996
921
continue;
997
922
}
1000
925
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
1001
926
direntries[i]->d_name);
1002
927
}
1003
close(plugin_fd);
928
TEMP_FAILURE_RETRY(close(plugin_fd));
1004
929
free(direntries[i]);
1005
930
continue;
1006
931
}
1046
971
if(pipefd[0] >= FD_SETSIZE){
1047
972
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1048
973
FD_SETSIZE);
1049
close(pipefd[0]);
1050
close(pipefd[1]);
974
TEMP_FAILURE_RETRY(close(pipefd[0]));
975
TEMP_FAILURE_RETRY(close(pipefd[1]));
1051
976
exitstatus = EX_OSERR;
1052
977
free(direntries[i]);
1053
978
goto fallback;
1057
982
ret = set_cloexec_flag(pipefd[0]);
1058
983
if(ret < 0){
1059
984
error(0, errno, "set_cloexec_flag");
1060
close(pipefd[0]);
1061
close(pipefd[1]);
985
TEMP_FAILURE_RETRY(close(pipefd[0]));
986
TEMP_FAILURE_RETRY(close(pipefd[1]));
1062
987
exitstatus = EX_OSERR;
1063
988
free(direntries[i]);
1064
989
goto fallback;
1066
991
ret = set_cloexec_flag(pipefd[1]);
1067
992
if(ret < 0){
1068
993
error(0, errno, "set_cloexec_flag");
1069
close(pipefd[0]);
1070
close(pipefd[1]);
994
TEMP_FAILURE_RETRY(close(pipefd[0]));
995
TEMP_FAILURE_RETRY(close(pipefd[1]));
1071
996
exitstatus = EX_OSERR;
1072
997
free(direntries[i]);
1073
998
goto fallback;
1092
1017
error(0, errno, "fork");
1093
1018
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1094
1019
&sigchld_action.sa_mask, NULL));
1095
close(pipefd[0]);
1096
close(pipefd[1]);
1020
TEMP_FAILURE_RETRY(close(pipefd[0]));
1021
TEMP_FAILURE_RETRY(close(pipefd[1]));
1097
1022
exitstatus = EX_OSERR;
1098
1023
free(direntries[i]);
1099
1024
goto fallback;
1127
1052
/* no return */
1128
1053
}
1129
1054
/* Parent process */
1130
close(pipefd[1]); /* Close unused write end of pipe */
1131
close(plugin_fd);
1055
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1056
pipe */
1057
TEMP_FAILURE_RETRY(close(plugin_fd));
1132
1058
plugin *new_plugin = getplugin(direntries[i]->d_name);
1133
1059
if(new_plugin == NULL){
1134
1060
error(0, errno, "getplugin");
1146
1072
1147
1073
new_plugin->pid = pid;
1148
1074
new_plugin->fd = pipefd[0];
1149
1150
if(debug){
1151
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1152
new_plugin->name, (intmax_t) (new_plugin->pid));
1153
}
1154
1075
1155
1076
/* Unblock SIGCHLD so signal handler can be run if this process
1156
1077
has already completed */
1157
1078
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1163
1084
goto fallback;
1164
1085
}
1165
1086
1166
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
1167
1101
1168
1102
if(maxfd < new_plugin->fd){
1169
1103
maxfd = new_plugin->fd;
1172
1106
1173
1107
free(direntries);
1174
1108
direntries = NULL;
1175
close(dir_fd);
1109
TEMP_FAILURE_RETRY(close(dir_fd));
1176
1110
dir_fd = -1;
1177
1111
free_plugin(getplugin(NULL));
1178
1112
1218
1152
(intmax_t) (proc->pid),
1219
1153
WTERMSIG(proc->status),
1220
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));
1221
1158
}
1222
1159
}
1223
1160
1224
1161
/* Remove the plugin */
1225
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
1226
1176
1227
1177
/* Block signal while modifying process_list */
1228
1178
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1268
1218
}
1269
1219
1270
1220
/* This process has not completed. Does it have any output? */
1271
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
1272
1238
/* This process had nothing to say at this time */
1273
1239
proc = proc->next;
1274
1240
continue;
1344
1310
free(direntries);
1345
1311
1346
1312
if(dir_fd != -1){
1347
close(dir_fd);
1313
TEMP_FAILURE_RETRY(close(dir_fd));
1348
1314
}
1349
1315
1350
1316
/* Kill the processes */
1370
1336
free_plugin_list();
1371
1337
1372
1338
free(plugindir);
1373
free(pluginhelperdir);
1374
1339
free(argfile);
1375
1340
1376
1341
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0