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- Committer: Teddy Hogeborn
- Date: 2009-10-26 21:16:16 UTC
- Revision ID: teddy@fukt.bsnet.se-20091026211616-38e9wynf4428ip2l
Merge from release branch.
- files removed:
- 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 © 2008-2011 Teddy Hogeborn
6
* Copyright © 2008-2011 Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 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@recompile.se>.
22
* Contact the authors at <mandos@fukt.bsnet.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_SUCCESS,
29
realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
30
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* fileno(), fprintf(),
31
#include <stdio.h> /* perror, 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(), strcmp(), strncmp() */
57
strsignal() */
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, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE */
75
72
76
73
#define BUFFER_SIZE 256
77
74
79
76
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
77
81
78
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
79
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
83
80
84
81
typedef struct plugin{
85
82
char *name; /* can be NULL or any plugin name */
171
168
}
172
169
173
170
/* Helper function for add_argument and add_environment */
174
__attribute__((nonnull))
175
171
static bool add_to_char_array(const char *new, char ***array,
176
172
int *len){
177
173
/* Resize the pointed-to array to hold one more pointer */
200
196
}
201
197
202
198
/* Add to a plugin's argument vector */
203
__attribute__((nonnull(2)))
204
199
static bool add_argument(plugin *p, const char *arg){
205
200
if(p == NULL){
206
201
return false;
209
204
}
210
205
211
206
/* Add to a plugin's environment */
212
__attribute__((nonnull(2)))
213
207
static bool add_environment(plugin *p, const char *def, bool replace){
214
208
if(p == NULL){
215
209
return false;
271
265
/* No child processes */
272
266
break;
273
267
}
274
error(0, errno, "waitpid");
268
perror("waitpid");
275
269
}
276
270
277
271
/* A child exited, find it in process_list */
289
283
}
290
284
291
285
/* Prints out a password to stdout */
292
__attribute__((nonnull))
293
286
static bool print_out_password(const char *buffer, size_t length){
294
287
ssize_t ret;
295
288
for(size_t written = 0; written < length; written += (size_t)ret){
303
296
}
304
297
305
298
/* Removes and free a plugin from the plugin list */
306
__attribute__((nonnull))
307
299
static void free_plugin(plugin *plugin_node){
308
300
309
301
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
364
356
sigemptyset(&sigchld_action.sa_mask);
365
357
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
366
358
if(ret == -1){
367
error(0, errno, "sigaddset");
368
exitstatus = EX_OSERR;
359
perror("sigaddset");
360
exitstatus = EXIT_FAILURE;
369
361
goto fallback;
370
362
}
371
363
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
372
364
if(ret == -1){
373
error(0, errno, "sigaction");
374
exitstatus = EX_OSERR;
365
perror("sigaction");
366
exitstatus = EXIT_FAILURE;
375
367
goto fallback;
376
368
}
377
369
421
413
{ .name = NULL }
422
414
};
423
415
424
__attribute__((nonnull(3)))
425
416
error_t parse_opt(int key, char *arg, struct argp_state *state){
426
417
errno = 0;
427
418
switch(key){
607
598
case ENOMEM:
608
599
default:
609
600
errno = ret;
610
error(0, errno, "argp_parse");
601
perror("argp_parse");
611
602
exitstatus = EX_OSERR;
612
603
goto fallback;
613
604
case EINVAL:
634
625
custom_argc = 1;
635
626
custom_argv = malloc(sizeof(char*) * 2);
636
627
if(custom_argv == NULL){
637
error(0, errno, "malloc");
638
exitstatus = EX_OSERR;
628
perror("malloc");
629
exitstatus = EXIT_FAILURE;
639
630
goto fallback;
640
631
}
641
632
custom_argv[0] = argv[0];
657
648
}
658
649
new_arg = strdup(p);
659
650
if(new_arg == NULL){
660
error(0, errno, "strdup");
661
exitstatus = EX_OSERR;
651
perror("strdup");
652
exitstatus = EXIT_FAILURE;
662
653
free(org_line);
663
654
goto fallback;
664
655
}
667
658
custom_argv = realloc(custom_argv, sizeof(char *)
668
659
* ((unsigned int) custom_argc + 1));
669
660
if(custom_argv == NULL){
670
error(0, errno, "realloc");
671
exitstatus = EX_OSERR;
661
perror("realloc");
662
exitstatus = EXIT_FAILURE;
672
663
free(org_line);
673
664
goto fallback;
674
665
}
680
671
ret = fclose(conffp);
681
672
} while(ret == EOF and errno == EINTR);
682
673
if(ret == EOF){
683
error(0, errno, "fclose");
684
exitstatus = EX_IOERR;
674
perror("fclose");
675
exitstatus = EXIT_FAILURE;
685
676
goto fallback;
686
677
}
687
678
free(org_line);
689
680
/* Check for harmful errors and go to fallback. Other errors might
690
681
not affect opening plugins */
691
682
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
692
error(0, errno, "fopen");
693
exitstatus = EX_OSERR;
683
perror("fopen");
684
exitstatus = EXIT_FAILURE;
694
685
goto fallback;
695
686
}
696
687
}
706
697
case ENOMEM:
707
698
default:
708
699
errno = ret;
709
error(0, errno, "argp_parse");
700
perror("argp_parse");
710
701
exitstatus = EX_OSERR;
711
702
goto fallback;
712
703
case EINVAL:
726
717
case ENOMEM:
727
718
default:
728
719
errno = ret;
729
error(0, errno, "argp_parse");
720
perror("argp_parse");
730
721
exitstatus = EX_OSERR;
731
722
goto fallback;
732
723
case EINVAL:
748
739
}
749
740
}
750
741
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 */
742
/* Strip permissions down to nobody */
774
743
setgid(gid);
775
744
if(ret == -1){
776
error(0, errno, "setgid");
745
perror("setgid");
777
746
}
778
747
ret = setuid(uid);
779
748
if(ret == -1){
780
error(0, errno, "setuid");
749
perror("setuid");
781
750
}
782
751
783
752
/* Open plugin directory with close_on_exec flag */
801
770
);
802
771
}
803
772
if(dir_fd == -1){
804
error(0, errno, "Could not open plugin dir");
805
exitstatus = EX_UNAVAILABLE;
773
perror("Could not open plugin dir");
774
exitstatus = EXIT_FAILURE;
806
775
goto fallback;
807
776
}
808
777
810
779
/* Set the FD_CLOEXEC flag on the directory */
811
780
ret = set_cloexec_flag(dir_fd);
812
781
if(ret < 0){
813
error(0, errno, "set_cloexec_flag");
782
perror("set_cloexec_flag");
814
783
TEMP_FAILURE_RETRY(close(dir_fd));
815
exitstatus = EX_OSERR;
784
exitstatus = EXIT_FAILURE;
816
785
goto fallback;
817
786
}
818
787
#endif /* O_CLOEXEC */
819
788
820
789
dir = fdopendir(dir_fd);
821
790
if(dir == NULL){
822
error(0, errno, "Could not open plugin dir");
791
perror("Could not open plugin dir");
823
792
TEMP_FAILURE_RETRY(close(dir_fd));
824
exitstatus = EX_OSERR;
793
exitstatus = EXIT_FAILURE;
825
794
goto fallback;
826
795
}
827
796
}
837
806
/* All directory entries have been processed */
838
807
if(dirst == NULL){
839
808
if(errno == EBADF){
840
error(0, errno, "readdir");
841
exitstatus = EX_IOERR;
809
perror("readdir");
810
exitstatus = EXIT_FAILURE;
842
811
goto fallback;
843
812
}
844
813
break;
874
843
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
875
844
size_t suf_len = strlen(*suf);
876
845
if((d_name_len >= suf_len)
877
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
846
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
878
847
== 0)){
879
848
if(debug){
880
849
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
900
869
dirst->d_name));
901
870
}
902
871
if(ret < 0){
903
error(0, errno, "asprintf");
872
perror("asprintf");
904
873
continue;
905
874
}
906
875
907
876
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
908
877
if(ret == -1){
909
error(0, errno, "stat");
878
perror("stat");
910
879
free(filename);
911
880
continue;
912
881
}
924
893
925
894
plugin *p = getplugin(dirst->d_name);
926
895
if(p == NULL){
927
error(0, errno, "getplugin");
896
perror("getplugin");
928
897
free(filename);
929
898
continue;
930
899
}
942
911
if(g != NULL){
943
912
for(char **a = g->argv + 1; *a != NULL; a++){
944
913
if(not add_argument(p, *a)){
945
error(0, errno, "add_argument");
914
perror("add_argument");
946
915
}
947
916
}
948
917
/* Add global environment variables */
949
918
for(char **e = g->environ; *e != NULL; e++){
950
919
if(not add_environment(p, *e, false)){
951
error(0, errno, "add_environment");
920
perror("add_environment");
952
921
}
953
922
}
954
923
}
959
928
if(p->environ[0] != NULL){
960
929
for(char **e = environ; *e != NULL; e++){
961
930
if(not add_environment(p, *e, false)){
962
error(0, errno, "add_environment");
931
perror("add_environment");
963
932
}
964
933
}
965
934
}
967
936
int pipefd[2];
968
937
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
969
938
if(ret == -1){
970
error(0, errno, "pipe");
971
exitstatus = EX_OSERR;
939
perror("pipe");
940
exitstatus = EXIT_FAILURE;
972
941
goto fallback;
973
942
}
974
943
/* Ask OS to automatic close the pipe on exec */
975
944
ret = set_cloexec_flag(pipefd[0]);
976
945
if(ret < 0){
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
946
perror("set_cloexec_flag");
947
exitstatus = EXIT_FAILURE;
979
948
goto fallback;
980
949
}
981
950
ret = set_cloexec_flag(pipefd[1]);
982
951
if(ret < 0){
983
error(0, errno, "set_cloexec_flag");
984
exitstatus = EX_OSERR;
952
perror("set_cloexec_flag");
953
exitstatus = EXIT_FAILURE;
985
954
goto fallback;
986
955
}
987
956
/* Block SIGCHLD until process is safely in process list */
989
958
&sigchld_action.sa_mask,
990
959
NULL));
991
960
if(ret < 0){
992
error(0, errno, "sigprocmask");
993
exitstatus = EX_OSERR;
961
perror("sigprocmask");
962
exitstatus = EXIT_FAILURE;
994
963
goto fallback;
995
964
}
996
965
/* Starting a new process to be watched */
999
968
pid = fork();
1000
969
} while(pid == -1 and errno == EINTR);
1001
970
if(pid == -1){
1002
error(0, errno, "fork");
1003
exitstatus = EX_OSERR;
971
perror("fork");
972
exitstatus = EXIT_FAILURE;
1004
973
goto fallback;
1005
974
}
1006
975
if(pid == 0){
1007
976
/* this is the child process */
1008
977
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1009
978
if(ret < 0){
1010
error(0, errno, "sigaction");
1011
_exit(EX_OSERR);
979
perror("sigaction");
980
_exit(EXIT_FAILURE);
1012
981
}
1013
982
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1014
983
if(ret < 0){
1015
error(0, errno, "sigprocmask");
1016
_exit(EX_OSERR);
984
perror("sigprocmask");
985
_exit(EXIT_FAILURE);
1017
986
}
1018
987
1019
988
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1020
989
if(ret == -1){
1021
error(0, errno, "dup2");
1022
_exit(EX_OSERR);
990
perror("dup2");
991
_exit(EXIT_FAILURE);
1023
992
}
1024
993
1025
994
if(dirfd(dir) < 0){
1029
998
}
1030
999
if(p->environ[0] == NULL){
1031
1000
if(execv(filename, p->argv) < 0){
1032
error(0, errno, "execv for %s", filename);
1033
_exit(EX_OSERR);
1001
perror("execv");
1002
_exit(EXIT_FAILURE);
1034
1003
}
1035
1004
} else {
1036
1005
if(execve(filename, p->argv, p->environ) < 0){
1037
error(0, errno, "execve for %s", filename);
1038
_exit(EX_OSERR);
1006
perror("execve");
1007
_exit(EXIT_FAILURE);
1039
1008
}
1040
1009
}
1041
1010
/* no return */
1046
1015
free(filename);
1047
1016
plugin *new_plugin = getplugin(dirst->d_name);
1048
1017
if(new_plugin == NULL){
1049
error(0, errno, "getplugin");
1018
perror("getplugin");
1050
1019
ret = (int)(TEMP_FAILURE_RETRY
1051
1020
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1052
1021
NULL)));
1053
1022
if(ret < 0){
1054
error(0, errno, "sigprocmask");
1023
perror("sigprocmask");
1055
1024
}
1056
exitstatus = EX_OSERR;
1025
exitstatus = EXIT_FAILURE;
1057
1026
goto fallback;
1058
1027
}
1059
1028
1066
1035
&sigchld_action.sa_mask,
1067
1036
NULL));
1068
1037
if(ret < 0){
1069
error(0, errno, "sigprocmask");
1070
exitstatus = EX_OSERR;
1038
perror("sigprocmask");
1039
exitstatus = EXIT_FAILURE;
1071
1040
goto fallback;
1072
1041
}
1073
1042
1099
1068
fd_set rfds = rfds_all;
1100
1069
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1101
1070
if(select_ret == -1 and errno != EINTR){
1102
error(0, errno, "select");
1103
exitstatus = EX_OSERR;
1071
perror("select");
1072
exitstatus = EXIT_FAILURE;
1104
1073
goto fallback;
1105
1074
}
1106
1075
/* OK, now either a process completed, or something can be read
1141
1110
&sigchld_action.sa_mask,
1142
1111
NULL));
1143
1112
if(ret < 0){
1144
error(0, errno, "sigprocmask");
1145
exitstatus = EX_OSERR;
1113
perror("sigprocmask");
1114
exitstatus = EXIT_FAILURE;
1146
1115
goto fallback;
1147
1116
}
1148
1117
1155
1124
(sigprocmask(SIG_UNBLOCK,
1156
1125
&sigchld_action.sa_mask, NULL)));
1157
1126
if(ret < 0){
1158
error(0, errno, "sigprocmask");
1159
exitstatus = EX_OSERR;
1127
perror("sigprocmask");
1128
exitstatus = EXIT_FAILURE;
1160
1129
goto fallback;
1161
1130
}
1162
1131
1172
1141
bool bret = print_out_password(proc->buffer,
1173
1142
proc->buffer_length);
1174
1143
if(not bret){
1175
error(0, errno, "print_out_password");
1176
exitstatus = EX_IOERR;
1144
perror("print_out_password");
1145
exitstatus = EXIT_FAILURE;
1177
1146
}
1178
1147
goto fallback;
1179
1148
}
1191
1160
proc->buffer = realloc(proc->buffer, proc->buffer_size
1192
1161
+ (size_t) BUFFER_SIZE);
1193
1162
if(proc->buffer == NULL){
1194
error(0, errno, "malloc");
1195
exitstatus = EX_OSERR;
1163
perror("malloc");
1164
exitstatus = EXIT_FAILURE;
1196
1165
goto fallback;
1197
1166
}
1198
1167
proc->buffer_size += BUFFER_SIZE;
1219
1188
1220
1189
fallback:
1221
1190
1222
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1223
and exitstatus != EX_OK)){
1191
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1224
1192
/* Fallback if all plugins failed, none are found or an error
1225
1193
occured */
1226
1194
bool bret;
1234
1202
}
1235
1203
bret = print_out_password(passwordbuffer, len);
1236
1204
if(not bret){
1237
error(0, errno, "print_out_password");
1238
exitstatus = EX_IOERR;
1205
perror("print_out_password");
1206
exitstatus = EXIT_FAILURE;
1239
1207
}
1240
1208
}
1241
1209
1242
1210
/* Restore old signal handler */
1243
1211
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1244
1212
if(ret == -1){
1245
error(0, errno, "sigaction");
1246
exitstatus = EX_OSERR;
1213
perror("sigaction");
1214
exitstatus = EXIT_FAILURE;
1247
1215
}
1248
1216
1249
1217
if(custom_argv != NULL){
1264
1232
ret = kill(p->pid, SIGTERM);
1265
1233
if(ret == -1 and errno != ESRCH){
1266
1234
/* Set-uid proccesses might not get closed */
1267
error(0, errno, "kill");
1235
perror("kill");
1268
1236
}
1269
1237
}
1270
1238
}
1274
1242
ret = wait(NULL);
1275
1243
} while(ret >= 0);
1276
1244
if(errno != ECHILD){
1277
error(0, errno, "wait");
1245
perror("wait");
1278
1246
}
1279
1247
1280
1248
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0