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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
- files modified:
- .bzrignore
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008-2010 Teddy Hogeborn
6
* Copyright © 2008-2010 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
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
268
265
/* No child processes */
269
266
break;
270
267
}
271
error(0, errno, "waitpid");
268
perror("waitpid");
272
269
}
273
270
274
271
/* A child exited, find it in process_list */
359
356
sigemptyset(&sigchld_action.sa_mask);
360
357
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
361
358
if(ret == -1){
362
error(0, errno, "sigaddset");
363
exitstatus = EX_OSERR;
359
perror("sigaddset");
360
exitstatus = EXIT_FAILURE;
364
361
goto fallback;
365
362
}
366
363
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
367
364
if(ret == -1){
368
error(0, errno, "sigaction");
369
exitstatus = EX_OSERR;
365
perror("sigaction");
366
exitstatus = EXIT_FAILURE;
370
367
goto fallback;
371
368
}
372
369
601
598
case ENOMEM:
602
599
default:
603
600
errno = ret;
604
error(0, errno, "argp_parse");
601
perror("argp_parse");
605
602
exitstatus = EX_OSERR;
606
603
goto fallback;
607
604
case EINVAL:
628
625
custom_argc = 1;
629
626
custom_argv = malloc(sizeof(char*) * 2);
630
627
if(custom_argv == NULL){
631
error(0, errno, "malloc");
632
exitstatus = EX_OSERR;
628
perror("malloc");
629
exitstatus = EXIT_FAILURE;
633
630
goto fallback;
634
631
}
635
632
custom_argv[0] = argv[0];
651
648
}
652
649
new_arg = strdup(p);
653
650
if(new_arg == NULL){
654
error(0, errno, "strdup");
655
exitstatus = EX_OSERR;
651
perror("strdup");
652
exitstatus = EXIT_FAILURE;
656
653
free(org_line);
657
654
goto fallback;
658
655
}
661
658
custom_argv = realloc(custom_argv, sizeof(char *)
662
659
* ((unsigned int) custom_argc + 1));
663
660
if(custom_argv == NULL){
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
661
perror("realloc");
662
exitstatus = EXIT_FAILURE;
666
663
free(org_line);
667
664
goto fallback;
668
665
}
674
671
ret = fclose(conffp);
675
672
} while(ret == EOF and errno == EINTR);
676
673
if(ret == EOF){
677
error(0, errno, "fclose");
678
exitstatus = EX_IOERR;
674
perror("fclose");
675
exitstatus = EXIT_FAILURE;
679
676
goto fallback;
680
677
}
681
678
free(org_line);
683
680
/* Check for harmful errors and go to fallback. Other errors might
684
681
not affect opening plugins */
685
682
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
686
error(0, errno, "fopen");
687
exitstatus = EX_OSERR;
683
perror("fopen");
684
exitstatus = EXIT_FAILURE;
688
685
goto fallback;
689
686
}
690
687
}
700
697
case ENOMEM:
701
698
default:
702
699
errno = ret;
703
error(0, errno, "argp_parse");
700
perror("argp_parse");
704
701
exitstatus = EX_OSERR;
705
702
goto fallback;
706
703
case EINVAL:
720
717
case ENOMEM:
721
718
default:
722
719
errno = ret;
723
error(0, errno, "argp_parse");
720
perror("argp_parse");
724
721
exitstatus = EX_OSERR;
725
722
goto fallback;
726
723
case EINVAL:
742
739
}
743
740
}
744
741
745
{
746
/* Work around Debian bug #633582:
747
<http://bugs.debian.org/633582> */
748
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
749
if(plugindir_fd == -1){
750
error(0, errno, "open");
751
} else {
752
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
753
if(ret == -1){
754
error(0, errno, "fstat");
755
} else {
756
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
757
ret = fchown(plugindir_fd, uid, gid);
758
if(ret == -1){
759
error(0, errno, "fchown");
760
}
761
}
762
}
763
TEMP_FAILURE_RETRY(close(plugindir_fd));
764
}
765
}
766
767
/* Lower permissions */
742
/* Strip permissions down to nobody */
768
743
setgid(gid);
769
744
if(ret == -1){
770
error(0, errno, "setgid");
745
perror("setgid");
771
746
}
772
747
ret = setuid(uid);
773
748
if(ret == -1){
774
error(0, errno, "setuid");
749
perror("setuid");
775
750
}
776
751
777
752
/* Open plugin directory with close_on_exec flag */
795
770
);
796
771
}
797
772
if(dir_fd == -1){
798
error(0, errno, "Could not open plugin dir");
799
exitstatus = EX_UNAVAILABLE;
773
perror("Could not open plugin dir");
774
exitstatus = EXIT_FAILURE;
800
775
goto fallback;
801
776
}
802
777
804
779
/* Set the FD_CLOEXEC flag on the directory */
805
780
ret = set_cloexec_flag(dir_fd);
806
781
if(ret < 0){
807
error(0, errno, "set_cloexec_flag");
782
perror("set_cloexec_flag");
808
783
TEMP_FAILURE_RETRY(close(dir_fd));
809
exitstatus = EX_OSERR;
784
exitstatus = EXIT_FAILURE;
810
785
goto fallback;
811
786
}
812
787
#endif /* O_CLOEXEC */
813
788
814
789
dir = fdopendir(dir_fd);
815
790
if(dir == NULL){
816
error(0, errno, "Could not open plugin dir");
791
perror("Could not open plugin dir");
817
792
TEMP_FAILURE_RETRY(close(dir_fd));
818
exitstatus = EX_OSERR;
793
exitstatus = EXIT_FAILURE;
819
794
goto fallback;
820
795
}
821
796
}
831
806
/* All directory entries have been processed */
832
807
if(dirst == NULL){
833
808
if(errno == EBADF){
834
error(0, errno, "readdir");
835
exitstatus = EX_IOERR;
809
perror("readdir");
810
exitstatus = EXIT_FAILURE;
836
811
goto fallback;
837
812
}
838
813
break;
868
843
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
869
844
size_t suf_len = strlen(*suf);
870
845
if((d_name_len >= suf_len)
871
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
846
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
872
847
== 0)){
873
848
if(debug){
874
849
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
894
869
dirst->d_name));
895
870
}
896
871
if(ret < 0){
897
error(0, errno, "asprintf");
872
perror("asprintf");
898
873
continue;
899
874
}
900
875
901
876
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
902
877
if(ret == -1){
903
error(0, errno, "stat");
878
perror("stat");
904
879
free(filename);
905
880
continue;
906
881
}
918
893
919
894
plugin *p = getplugin(dirst->d_name);
920
895
if(p == NULL){
921
error(0, errno, "getplugin");
896
perror("getplugin");
922
897
free(filename);
923
898
continue;
924
899
}
936
911
if(g != NULL){
937
912
for(char **a = g->argv + 1; *a != NULL; a++){
938
913
if(not add_argument(p, *a)){
939
error(0, errno, "add_argument");
914
perror("add_argument");
940
915
}
941
916
}
942
917
/* Add global environment variables */
943
918
for(char **e = g->environ; *e != NULL; e++){
944
919
if(not add_environment(p, *e, false)){
945
error(0, errno, "add_environment");
920
perror("add_environment");
946
921
}
947
922
}
948
923
}
953
928
if(p->environ[0] != NULL){
954
929
for(char **e = environ; *e != NULL; e++){
955
930
if(not add_environment(p, *e, false)){
956
error(0, errno, "add_environment");
931
perror("add_environment");
957
932
}
958
933
}
959
934
}
961
936
int pipefd[2];
962
937
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
963
938
if(ret == -1){
964
error(0, errno, "pipe");
965
exitstatus = EX_OSERR;
939
perror("pipe");
940
exitstatus = EXIT_FAILURE;
966
941
goto fallback;
967
942
}
968
943
/* Ask OS to automatic close the pipe on exec */
969
944
ret = set_cloexec_flag(pipefd[0]);
970
945
if(ret < 0){
971
error(0, errno, "set_cloexec_flag");
972
exitstatus = EX_OSERR;
946
perror("set_cloexec_flag");
947
exitstatus = EXIT_FAILURE;
973
948
goto fallback;
974
949
}
975
950
ret = set_cloexec_flag(pipefd[1]);
976
951
if(ret < 0){
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
952
perror("set_cloexec_flag");
953
exitstatus = EXIT_FAILURE;
979
954
goto fallback;
980
955
}
981
956
/* Block SIGCHLD until process is safely in process list */
983
958
&sigchld_action.sa_mask,
984
959
NULL));
985
960
if(ret < 0){
986
error(0, errno, "sigprocmask");
987
exitstatus = EX_OSERR;
961
perror("sigprocmask");
962
exitstatus = EXIT_FAILURE;
988
963
goto fallback;
989
964
}
990
965
/* Starting a new process to be watched */
993
968
pid = fork();
994
969
} while(pid == -1 and errno == EINTR);
995
970
if(pid == -1){
996
error(0, errno, "fork");
997
exitstatus = EX_OSERR;
971
perror("fork");
972
exitstatus = EXIT_FAILURE;
998
973
goto fallback;
999
974
}
1000
975
if(pid == 0){
1001
976
/* this is the child process */
1002
977
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1003
978
if(ret < 0){
1004
error(0, errno, "sigaction");
1005
_exit(EX_OSERR);
979
perror("sigaction");
980
_exit(EXIT_FAILURE);
1006
981
}
1007
982
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1008
983
if(ret < 0){
1009
error(0, errno, "sigprocmask");
1010
_exit(EX_OSERR);
984
perror("sigprocmask");
985
_exit(EXIT_FAILURE);
1011
986
}
1012
987
1013
988
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1014
989
if(ret == -1){
1015
error(0, errno, "dup2");
1016
_exit(EX_OSERR);
990
perror("dup2");
991
_exit(EXIT_FAILURE);
1017
992
}
1018
993
1019
994
if(dirfd(dir) < 0){
1023
998
}
1024
999
if(p->environ[0] == NULL){
1025
1000
if(execv(filename, p->argv) < 0){
1026
error(0, errno, "execv for %s", filename);
1027
_exit(EX_OSERR);
1001
perror("execv");
1002
_exit(EXIT_FAILURE);
1028
1003
}
1029
1004
} else {
1030
1005
if(execve(filename, p->argv, p->environ) < 0){
1031
error(0, errno, "execve for %s", filename);
1032
_exit(EX_OSERR);
1006
perror("execve");
1007
_exit(EXIT_FAILURE);
1033
1008
}
1034
1009
}
1035
1010
/* no return */
1040
1015
free(filename);
1041
1016
plugin *new_plugin = getplugin(dirst->d_name);
1042
1017
if(new_plugin == NULL){
1043
error(0, errno, "getplugin");
1018
perror("getplugin");
1044
1019
ret = (int)(TEMP_FAILURE_RETRY
1045
1020
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1046
1021
NULL)));
1047
1022
if(ret < 0){
1048
error(0, errno, "sigprocmask");
1023
perror("sigprocmask");
1049
1024
}
1050
exitstatus = EX_OSERR;
1025
exitstatus = EXIT_FAILURE;
1051
1026
goto fallback;
1052
1027
}
1053
1028
1060
1035
&sigchld_action.sa_mask,
1061
1036
NULL));
1062
1037
if(ret < 0){
1063
error(0, errno, "sigprocmask");
1064
exitstatus = EX_OSERR;
1038
perror("sigprocmask");
1039
exitstatus = EXIT_FAILURE;
1065
1040
goto fallback;
1066
1041
}
1067
1042
1093
1068
fd_set rfds = rfds_all;
1094
1069
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1095
1070
if(select_ret == -1 and errno != EINTR){
1096
error(0, errno, "select");
1097
exitstatus = EX_OSERR;
1071
perror("select");
1072
exitstatus = EXIT_FAILURE;
1098
1073
goto fallback;
1099
1074
}
1100
1075
/* OK, now either a process completed, or something can be read
1135
1110
&sigchld_action.sa_mask,
1136
1111
NULL));
1137
1112
if(ret < 0){
1138
error(0, errno, "sigprocmask");
1139
exitstatus = EX_OSERR;
1113
perror("sigprocmask");
1114
exitstatus = EXIT_FAILURE;
1140
1115
goto fallback;
1141
1116
}
1142
1117
1149
1124
(sigprocmask(SIG_UNBLOCK,
1150
1125
&sigchld_action.sa_mask, NULL)));
1151
1126
if(ret < 0){
1152
error(0, errno, "sigprocmask");
1153
exitstatus = EX_OSERR;
1127
perror("sigprocmask");
1128
exitstatus = EXIT_FAILURE;
1154
1129
goto fallback;
1155
1130
}
1156
1131
1166
1141
bool bret = print_out_password(proc->buffer,
1167
1142
proc->buffer_length);
1168
1143
if(not bret){
1169
error(0, errno, "print_out_password");
1170
exitstatus = EX_IOERR;
1144
perror("print_out_password");
1145
exitstatus = EXIT_FAILURE;
1171
1146
}
1172
1147
goto fallback;
1173
1148
}
1185
1160
proc->buffer = realloc(proc->buffer, proc->buffer_size
1186
1161
+ (size_t) BUFFER_SIZE);
1187
1162
if(proc->buffer == NULL){
1188
error(0, errno, "malloc");
1189
exitstatus = EX_OSERR;
1163
perror("malloc");
1164
exitstatus = EXIT_FAILURE;
1190
1165
goto fallback;
1191
1166
}
1192
1167
proc->buffer_size += BUFFER_SIZE;
1213
1188
1214
1189
fallback:
1215
1190
1216
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1217
and exitstatus != EX_OK)){
1191
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1218
1192
/* Fallback if all plugins failed, none are found or an error
1219
1193
occured */
1220
1194
bool bret;
1228
1202
}
1229
1203
bret = print_out_password(passwordbuffer, len);
1230
1204
if(not bret){
1231
error(0, errno, "print_out_password");
1232
exitstatus = EX_IOERR;
1205
perror("print_out_password");
1206
exitstatus = EXIT_FAILURE;
1233
1207
}
1234
1208
}
1235
1209
1236
1210
/* Restore old signal handler */
1237
1211
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1238
1212
if(ret == -1){
1239
error(0, errno, "sigaction");
1240
exitstatus = EX_OSERR;
1213
perror("sigaction");
1214
exitstatus = EXIT_FAILURE;
1241
1215
}
1242
1216
1243
1217
if(custom_argv != NULL){
1258
1232
ret = kill(p->pid, SIGTERM);
1259
1233
if(ret == -1 and errno != ESRCH){
1260
1234
/* Set-uid proccesses might not get closed */
1261
error(0, errno, "kill");
1235
perror("kill");
1262
1236
}
1263
1237
}
1264
1238
}
1268
1242
ret = wait(NULL);
1269
1243
} while(ret >= 0);
1270
1244
if(errno != ECHILD){
1271
error(0, errno, "wait");
1245
perror("wait");
1272
1246
}
1273
1247
1274
1248
free_plugin_list();
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