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- Committer: Teddy Hogeborn
- Date: 2011-12-31 23:05:34 UTC
- Revision ID: teddy@recompile.se-20111231230534-o5w0uhwx30gwhmk7
Updated year in copyright notices.
- files added:
- DBUS-API
- debian/source
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
5
* Copyright © 2008-2012 Teddy Hogeborn
6
* Copyright © 2008-2012 Björn Påhlsson
7
7
*
8
8
* This program is free software: you can redistribute it and/or
9
9
* modify it under the terms of the GNU General Public License as
19
19
* along with this program. If not, see
20
20
* <http://www.gnu.org/licenses/>.
21
21
*
22
* Contact the authors at <mandos@fukt.bsnet.se>.
22
* Contact the authors at <mandos@recompile.se>.
23
23
*/
24
24
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
26
asprintf(), O_CLOEXEC */
27
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
30
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
31
#include <stdio.h> /* fileno(), fprintf(),
32
32
stderr, STDOUT_FILENO */
33
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
34
34
stat, waitpid(), WIFEXITED(),
54
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
55
FD_CLOEXEC */
56
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
57
strsignal(), strcmp(), strncmp() */
58
58
#include <errno.h> /* errno */
59
59
#include <argp.h> /* struct argp_option, struct
60
60
argp_state, struct argp,
68
68
*/
69
69
#include <errno.h> /* errno, EBADF */
70
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
72
75
73
76
#define BUFFER_SIZE 256
74
77
76
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
77
80
78
81
const char *argp_program_version = "plugin-runner " VERSION;
79
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
80
83
81
84
typedef struct plugin{
82
85
char *name; /* can be NULL or any plugin name */
168
171
}
169
172
170
173
/* Helper function for add_argument and add_environment */
174
__attribute__((nonnull))
171
175
static bool add_to_char_array(const char *new, char ***array,
172
176
int *len){
173
177
/* Resize the pointed-to array to hold one more pointer */
196
200
}
197
201
198
202
/* Add to a plugin's argument vector */
203
__attribute__((nonnull(2)))
199
204
static bool add_argument(plugin *p, const char *arg){
200
205
if(p == NULL){
201
206
return false;
204
209
}
205
210
206
211
/* Add to a plugin's environment */
212
__attribute__((nonnull(2)))
207
213
static bool add_environment(plugin *p, const char *def, bool replace){
208
214
if(p == NULL){
209
215
return false;
265
271
/* No child processes */
266
272
break;
267
273
}
268
perror("waitpid");
274
error(0, errno, "waitpid");
269
275
}
270
276
271
277
/* A child exited, find it in process_list */
283
289
}
284
290
285
291
/* Prints out a password to stdout */
292
__attribute__((nonnull))
286
293
static bool print_out_password(const char *buffer, size_t length){
287
294
ssize_t ret;
288
295
for(size_t written = 0; written < length; written += (size_t)ret){
296
303
}
297
304
298
305
/* Removes and free a plugin from the plugin list */
306
__attribute__((nonnull))
299
307
static void free_plugin(plugin *plugin_node){
300
308
301
309
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
356
364
sigemptyset(&sigchld_action.sa_mask);
357
365
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
358
366
if(ret == -1){
359
perror("sigaddset");
360
exitstatus = EXIT_FAILURE;
367
error(0, errno, "sigaddset");
368
exitstatus = EX_OSERR;
361
369
goto fallback;
362
370
}
363
371
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
364
372
if(ret == -1){
365
perror("sigaction");
366
exitstatus = EXIT_FAILURE;
373
error(0, errno, "sigaction");
374
exitstatus = EX_OSERR;
367
375
goto fallback;
368
376
}
369
377
413
421
{ .name = NULL }
414
422
};
415
423
424
__attribute__((nonnull(3)))
416
425
error_t parse_opt(int key, char *arg, struct argp_state *state){
417
426
errno = 0;
418
427
switch(key){
419
428
char *tmp;
420
intmax_t tmpmax;
429
intmax_t tmp_id;
421
430
case 'g': /* --global-options */
422
431
{
423
432
char *plugin_option;
496
505
/* This is already done by parse_opt_config_file() */
497
506
break;
498
507
case 130: /* --userid */
499
tmpmax = strtoimax(arg, &tmp, 10);
508
tmp_id = strtoimax(arg, &tmp, 10);
500
509
if(errno != 0 or tmp == arg or *tmp != '\0'
501
or tmpmax != (uid_t)tmpmax){
510
or tmp_id != (uid_t)tmp_id){
502
511
argp_error(state, "Bad user ID number: \"%s\", using %"
503
512
PRIdMAX, arg, (intmax_t)uid);
504
513
break;
505
514
}
506
uid = (uid_t)tmpmax;
515
uid = (uid_t)tmp_id;
507
516
break;
508
517
case 131: /* --groupid */
509
tmpmax = strtoimax(arg, &tmp, 10);
518
tmp_id = strtoimax(arg, &tmp, 10);
510
519
if(errno != 0 or tmp == arg or *tmp != '\0'
511
or tmpmax != (gid_t)tmpmax){
520
or tmp_id != (gid_t)tmp_id){
512
521
argp_error(state, "Bad group ID number: \"%s\", using %"
513
522
PRIdMAX, arg, (intmax_t)gid);
514
523
break;
515
524
}
516
gid = (gid_t)tmpmax;
525
gid = (gid_t)tmp_id;
517
526
break;
518
527
case 132: /* --debug */
519
528
debug = true;
598
607
case ENOMEM:
599
608
default:
600
609
errno = ret;
601
perror("argp_parse");
610
error(0, errno, "argp_parse");
602
611
exitstatus = EX_OSERR;
603
612
goto fallback;
604
613
case EINVAL:
625
634
custom_argc = 1;
626
635
custom_argv = malloc(sizeof(char*) * 2);
627
636
if(custom_argv == NULL){
628
perror("malloc");
629
exitstatus = EXIT_FAILURE;
637
error(0, errno, "malloc");
638
exitstatus = EX_OSERR;
630
639
goto fallback;
631
640
}
632
641
custom_argv[0] = argv[0];
648
657
}
649
658
new_arg = strdup(p);
650
659
if(new_arg == NULL){
651
perror("strdup");
652
exitstatus = EXIT_FAILURE;
660
error(0, errno, "strdup");
661
exitstatus = EX_OSERR;
653
662
free(org_line);
654
663
goto fallback;
655
664
}
658
667
custom_argv = realloc(custom_argv, sizeof(char *)
659
668
* ((unsigned int) custom_argc + 1));
660
669
if(custom_argv == NULL){
661
perror("realloc");
662
exitstatus = EXIT_FAILURE;
670
error(0, errno, "realloc");
671
exitstatus = EX_OSERR;
663
672
free(org_line);
664
673
goto fallback;
665
674
}
671
680
ret = fclose(conffp);
672
681
} while(ret == EOF and errno == EINTR);
673
682
if(ret == EOF){
674
perror("fclose");
675
exitstatus = EXIT_FAILURE;
683
error(0, errno, "fclose");
684
exitstatus = EX_IOERR;
676
685
goto fallback;
677
686
}
678
687
free(org_line);
680
689
/* Check for harmful errors and go to fallback. Other errors might
681
690
not affect opening plugins */
682
691
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
683
perror("fopen");
684
exitstatus = EXIT_FAILURE;
692
error(0, errno, "fopen");
693
exitstatus = EX_OSERR;
685
694
goto fallback;
686
695
}
687
696
}
697
706
case ENOMEM:
698
707
default:
699
708
errno = ret;
700
perror("argp_parse");
709
error(0, errno, "argp_parse");
701
710
exitstatus = EX_OSERR;
702
711
goto fallback;
703
712
case EINVAL:
717
726
case ENOMEM:
718
727
default:
719
728
errno = ret;
720
perror("argp_parse");
729
error(0, errno, "argp_parse");
721
730
exitstatus = EX_OSERR;
722
731
goto fallback;
723
732
case EINVAL:
739
748
}
740
749
}
741
750
742
/* Strip permissions down to nobody */
751
if(getuid() == 0){
752
/* Work around Debian bug #633582:
753
<http://bugs.debian.org/633582> */
754
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
755
if(plugindir_fd == -1){
756
error(0, errno, "open");
757
} else {
758
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
759
if(ret == -1){
760
error(0, errno, "fstat");
761
} else {
762
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
763
ret = fchown(plugindir_fd, uid, gid);
764
if(ret == -1){
765
error(0, errno, "fchown");
766
}
767
}
768
}
769
TEMP_FAILURE_RETRY(close(plugindir_fd));
770
}
771
}
772
773
/* Lower permissions */
743
774
setgid(gid);
744
775
if(ret == -1){
745
perror("setgid");
776
error(0, errno, "setgid");
746
777
}
747
778
ret = setuid(uid);
748
779
if(ret == -1){
749
perror("setuid");
780
error(0, errno, "setuid");
750
781
}
751
782
752
783
/* Open plugin directory with close_on_exec flag */
770
801
);
771
802
}
772
803
if(dir_fd == -1){
773
perror("Could not open plugin dir");
774
exitstatus = EXIT_FAILURE;
804
error(0, errno, "Could not open plugin dir");
805
exitstatus = EX_UNAVAILABLE;
775
806
goto fallback;
776
807
}
777
808
779
810
/* Set the FD_CLOEXEC flag on the directory */
780
811
ret = set_cloexec_flag(dir_fd);
781
812
if(ret < 0){
782
perror("set_cloexec_flag");
813
error(0, errno, "set_cloexec_flag");
783
814
TEMP_FAILURE_RETRY(close(dir_fd));
784
exitstatus = EXIT_FAILURE;
815
exitstatus = EX_OSERR;
785
816
goto fallback;
786
817
}
787
818
#endif /* O_CLOEXEC */
788
819
789
820
dir = fdopendir(dir_fd);
790
821
if(dir == NULL){
791
perror("Could not open plugin dir");
822
error(0, errno, "Could not open plugin dir");
792
823
TEMP_FAILURE_RETRY(close(dir_fd));
793
exitstatus = EXIT_FAILURE;
824
exitstatus = EX_OSERR;
794
825
goto fallback;
795
826
}
796
827
}
806
837
/* All directory entries have been processed */
807
838
if(dirst == NULL){
808
839
if(errno == EBADF){
809
perror("readdir");
810
exitstatus = EXIT_FAILURE;
840
error(0, errno, "readdir");
841
exitstatus = EX_IOERR;
811
842
goto fallback;
812
843
}
813
844
break;
843
874
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
844
875
size_t suf_len = strlen(*suf);
845
876
if((d_name_len >= suf_len)
846
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
877
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
847
878
== 0)){
848
879
if(debug){
849
880
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
869
900
dirst->d_name));
870
901
}
871
902
if(ret < 0){
872
perror("asprintf");
903
error(0, errno, "asprintf");
873
904
continue;
874
905
}
875
906
876
907
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
877
908
if(ret == -1){
878
perror("stat");
909
error(0, errno, "stat");
879
910
free(filename);
880
911
continue;
881
912
}
893
924
894
925
plugin *p = getplugin(dirst->d_name);
895
926
if(p == NULL){
896
perror("getplugin");
927
error(0, errno, "getplugin");
897
928
free(filename);
898
929
continue;
899
930
}
911
942
if(g != NULL){
912
943
for(char **a = g->argv + 1; *a != NULL; a++){
913
944
if(not add_argument(p, *a)){
914
perror("add_argument");
945
error(0, errno, "add_argument");
915
946
}
916
947
}
917
948
/* Add global environment variables */
918
949
for(char **e = g->environ; *e != NULL; e++){
919
950
if(not add_environment(p, *e, false)){
920
perror("add_environment");
951
error(0, errno, "add_environment");
921
952
}
922
953
}
923
954
}
928
959
if(p->environ[0] != NULL){
929
960
for(char **e = environ; *e != NULL; e++){
930
961
if(not add_environment(p, *e, false)){
931
perror("add_environment");
962
error(0, errno, "add_environment");
932
963
}
933
964
}
934
965
}
936
967
int pipefd[2];
937
968
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
938
969
if(ret == -1){
939
perror("pipe");
940
exitstatus = EXIT_FAILURE;
970
error(0, errno, "pipe");
971
exitstatus = EX_OSERR;
941
972
goto fallback;
942
973
}
943
974
/* Ask OS to automatic close the pipe on exec */
944
975
ret = set_cloexec_flag(pipefd[0]);
945
976
if(ret < 0){
946
perror("set_cloexec_flag");
947
exitstatus = EXIT_FAILURE;
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
948
979
goto fallback;
949
980
}
950
981
ret = set_cloexec_flag(pipefd[1]);
951
982
if(ret < 0){
952
perror("set_cloexec_flag");
953
exitstatus = EXIT_FAILURE;
983
error(0, errno, "set_cloexec_flag");
984
exitstatus = EX_OSERR;
954
985
goto fallback;
955
986
}
956
987
/* Block SIGCHLD until process is safely in process list */
958
989
&sigchld_action.sa_mask,
959
990
NULL));
960
991
if(ret < 0){
961
perror("sigprocmask");
962
exitstatus = EXIT_FAILURE;
992
error(0, errno, "sigprocmask");
993
exitstatus = EX_OSERR;
963
994
goto fallback;
964
995
}
965
996
/* Starting a new process to be watched */
968
999
pid = fork();
969
1000
} while(pid == -1 and errno == EINTR);
970
1001
if(pid == -1){
971
perror("fork");
972
exitstatus = EXIT_FAILURE;
1002
error(0, errno, "fork");
1003
exitstatus = EX_OSERR;
973
1004
goto fallback;
974
1005
}
975
1006
if(pid == 0){
976
1007
/* this is the child process */
977
1008
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
978
1009
if(ret < 0){
979
perror("sigaction");
980
_exit(EXIT_FAILURE);
1010
error(0, errno, "sigaction");
1011
_exit(EX_OSERR);
981
1012
}
982
1013
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
983
1014
if(ret < 0){
984
perror("sigprocmask");
985
_exit(EXIT_FAILURE);
1015
error(0, errno, "sigprocmask");
1016
_exit(EX_OSERR);
986
1017
}
987
1018
988
1019
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
989
1020
if(ret == -1){
990
perror("dup2");
991
_exit(EXIT_FAILURE);
1021
error(0, errno, "dup2");
1022
_exit(EX_OSERR);
992
1023
}
993
1024
994
1025
if(dirfd(dir) < 0){
998
1029
}
999
1030
if(p->environ[0] == NULL){
1000
1031
if(execv(filename, p->argv) < 0){
1001
perror("execv");
1002
_exit(EXIT_FAILURE);
1032
error(0, errno, "execv for %s", filename);
1033
_exit(EX_OSERR);
1003
1034
}
1004
1035
} else {
1005
1036
if(execve(filename, p->argv, p->environ) < 0){
1006
perror("execve");
1007
_exit(EXIT_FAILURE);
1037
error(0, errno, "execve for %s", filename);
1038
_exit(EX_OSERR);
1008
1039
}
1009
1040
}
1010
1041
/* no return */
1015
1046
free(filename);
1016
1047
plugin *new_plugin = getplugin(dirst->d_name);
1017
1048
if(new_plugin == NULL){
1018
perror("getplugin");
1049
error(0, errno, "getplugin");
1019
1050
ret = (int)(TEMP_FAILURE_RETRY
1020
1051
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1021
1052
NULL)));
1022
1053
if(ret < 0){
1023
perror("sigprocmask");
1054
error(0, errno, "sigprocmask");
1024
1055
}
1025
exitstatus = EXIT_FAILURE;
1056
exitstatus = EX_OSERR;
1026
1057
goto fallback;
1027
1058
}
1028
1059
1035
1066
&sigchld_action.sa_mask,
1036
1067
NULL));
1037
1068
if(ret < 0){
1038
perror("sigprocmask");
1039
exitstatus = EXIT_FAILURE;
1069
error(0, errno, "sigprocmask");
1070
exitstatus = EX_OSERR;
1040
1071
goto fallback;
1041
1072
}
1042
1073
1068
1099
fd_set rfds = rfds_all;
1069
1100
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1070
1101
if(select_ret == -1 and errno != EINTR){
1071
perror("select");
1072
exitstatus = EXIT_FAILURE;
1102
error(0, errno, "select");
1103
exitstatus = EX_OSERR;
1073
1104
goto fallback;
1074
1105
}
1075
1106
/* OK, now either a process completed, or something can be read
1110
1141
&sigchld_action.sa_mask,
1111
1142
NULL));
1112
1143
if(ret < 0){
1113
perror("sigprocmask");
1114
exitstatus = EXIT_FAILURE;
1144
error(0, errno, "sigprocmask");
1145
exitstatus = EX_OSERR;
1115
1146
goto fallback;
1116
1147
}
1117
1148
1124
1155
(sigprocmask(SIG_UNBLOCK,
1125
1156
&sigchld_action.sa_mask, NULL)));
1126
1157
if(ret < 0){
1127
perror("sigprocmask");
1128
exitstatus = EXIT_FAILURE;
1158
error(0, errno, "sigprocmask");
1159
exitstatus = EX_OSERR;
1129
1160
goto fallback;
1130
1161
}
1131
1162
1141
1172
bool bret = print_out_password(proc->buffer,
1142
1173
proc->buffer_length);
1143
1174
if(not bret){
1144
perror("print_out_password");
1145
exitstatus = EXIT_FAILURE;
1175
error(0, errno, "print_out_password");
1176
exitstatus = EX_IOERR;
1146
1177
}
1147
1178
goto fallback;
1148
1179
}
1160
1191
proc->buffer = realloc(proc->buffer, proc->buffer_size
1161
1192
+ (size_t) BUFFER_SIZE);
1162
1193
if(proc->buffer == NULL){
1163
perror("malloc");
1164
exitstatus = EXIT_FAILURE;
1194
error(0, errno, "malloc");
1195
exitstatus = EX_OSERR;
1165
1196
goto fallback;
1166
1197
}
1167
1198
proc->buffer_size += BUFFER_SIZE;
1188
1219
1189
1220
fallback:
1190
1221
1191
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1222
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1223
and exitstatus != EX_OK)){
1192
1224
/* Fallback if all plugins failed, none are found or an error
1193
1225
occured */
1194
1226
bool bret;
1202
1234
}
1203
1235
bret = print_out_password(passwordbuffer, len);
1204
1236
if(not bret){
1205
perror("print_out_password");
1206
exitstatus = EXIT_FAILURE;
1237
error(0, errno, "print_out_password");
1238
exitstatus = EX_IOERR;
1207
1239
}
1208
1240
}
1209
1241
1210
1242
/* Restore old signal handler */
1211
1243
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1212
1244
if(ret == -1){
1213
perror("sigaction");
1214
exitstatus = EXIT_FAILURE;
1245
error(0, errno, "sigaction");
1246
exitstatus = EX_OSERR;
1215
1247
}
1216
1248
1217
1249
if(custom_argv != NULL){
1232
1264
ret = kill(p->pid, SIGTERM);
1233
1265
if(ret == -1 and errno != ESRCH){
1234
1266
/* Set-uid proccesses might not get closed */
1235
perror("kill");
1267
error(0, errno, "kill");
1236
1268
}
1237
1269
}
1238
1270
}
1242
1274
ret = wait(NULL);
1243
1275
} while(ret >= 0);
1244
1276
if(errno != ECHILD){
1245
perror("wait");
1277
error(0, errno, "wait");
1246
1278
}
1247
1279
1248
1280
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0