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- Committer: Björn Påhlsson
- Date: 2010-10-02 16:57:03 UTC
- mfrom: (24.1.168 mandos)
- Revision ID: belorn@fukt.bsnet.se-20101002165703-u41e3cdyj12t728p
Merge from trunk. Just a minor release to make it lintian clean.
- files added:
- DBUS-API
- 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 © 2008-2010 Teddy Hogeborn
6
* Copyright © 2008-2010 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
28
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
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(),
70
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
73
75
74
76
#define BUFFER_SIZE 256
75
77
266
268
/* No child processes */
267
269
break;
268
270
}
269
perror("waitpid");
271
error(0, errno, "waitpid");
270
272
}
271
273
272
274
/* A child exited, find it in process_list */
357
359
sigemptyset(&sigchld_action.sa_mask);
358
360
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
359
361
if(ret == -1){
360
perror("sigaddset");
362
error(0, errno, "sigaddset");
361
363
exitstatus = EX_OSERR;
362
364
goto fallback;
363
365
}
364
366
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
365
367
if(ret == -1){
366
perror("sigaction");
368
error(0, errno, "sigaction");
367
369
exitstatus = EX_OSERR;
368
370
goto fallback;
369
371
}
599
601
case ENOMEM:
600
602
default:
601
603
errno = ret;
602
perror("argp_parse");
604
error(0, errno, "argp_parse");
603
605
exitstatus = EX_OSERR;
604
606
goto fallback;
605
607
case EINVAL:
626
628
custom_argc = 1;
627
629
custom_argv = malloc(sizeof(char*) * 2);
628
630
if(custom_argv == NULL){
629
perror("malloc");
631
error(0, errno, "malloc");
630
632
exitstatus = EX_OSERR;
631
633
goto fallback;
632
634
}
649
651
}
650
652
new_arg = strdup(p);
651
653
if(new_arg == NULL){
652
perror("strdup");
654
error(0, errno, "strdup");
653
655
exitstatus = EX_OSERR;
654
656
free(org_line);
655
657
goto fallback;
659
661
custom_argv = realloc(custom_argv, sizeof(char *)
660
662
* ((unsigned int) custom_argc + 1));
661
663
if(custom_argv == NULL){
662
perror("realloc");
664
error(0, errno, "realloc");
663
665
exitstatus = EX_OSERR;
664
666
free(org_line);
665
667
goto fallback;
672
674
ret = fclose(conffp);
673
675
} while(ret == EOF and errno == EINTR);
674
676
if(ret == EOF){
675
perror("fclose");
677
error(0, errno, "fclose");
676
678
exitstatus = EX_IOERR;
677
679
goto fallback;
678
680
}
681
683
/* Check for harmful errors and go to fallback. Other errors might
682
684
not affect opening plugins */
683
685
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
684
perror("fopen");
686
error(0, errno, "fopen");
685
687
exitstatus = EX_OSERR;
686
688
goto fallback;
687
689
}
698
700
case ENOMEM:
699
701
default:
700
702
errno = ret;
701
perror("argp_parse");
703
error(0, errno, "argp_parse");
702
704
exitstatus = EX_OSERR;
703
705
goto fallback;
704
706
case EINVAL:
718
720
case ENOMEM:
719
721
default:
720
722
errno = ret;
721
perror("argp_parse");
723
error(0, errno, "argp_parse");
722
724
exitstatus = EX_OSERR;
723
725
goto fallback;
724
726
case EINVAL:
743
745
/* Strip permissions down to nobody */
744
746
setgid(gid);
745
747
if(ret == -1){
746
perror("setgid");
748
error(0, errno, "setgid");
747
749
}
748
750
ret = setuid(uid);
749
751
if(ret == -1){
750
perror("setuid");
752
error(0, errno, "setuid");
751
753
}
752
754
753
755
/* Open plugin directory with close_on_exec flag */
771
773
);
772
774
}
773
775
if(dir_fd == -1){
774
perror("Could not open plugin dir");
776
error(0, errno, "Could not open plugin dir");
775
777
exitstatus = EX_UNAVAILABLE;
776
778
goto fallback;
777
779
}
780
782
/* Set the FD_CLOEXEC flag on the directory */
781
783
ret = set_cloexec_flag(dir_fd);
782
784
if(ret < 0){
783
perror("set_cloexec_flag");
785
error(0, errno, "set_cloexec_flag");
784
786
TEMP_FAILURE_RETRY(close(dir_fd));
785
787
exitstatus = EX_OSERR;
786
788
goto fallback;
789
791
790
792
dir = fdopendir(dir_fd);
791
793
if(dir == NULL){
792
perror("Could not open plugin dir");
794
error(0, errno, "Could not open plugin dir");
793
795
TEMP_FAILURE_RETRY(close(dir_fd));
794
796
exitstatus = EX_OSERR;
795
797
goto fallback;
807
809
/* All directory entries have been processed */
808
810
if(dirst == NULL){
809
811
if(errno == EBADF){
810
perror("readdir");
812
error(0, errno, "readdir");
811
813
exitstatus = EX_IOERR;
812
814
goto fallback;
813
815
}
870
872
dirst->d_name));
871
873
}
872
874
if(ret < 0){
873
perror("asprintf");
875
error(0, errno, "asprintf");
874
876
continue;
875
877
}
876
878
877
879
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
878
880
if(ret == -1){
879
perror("stat");
881
error(0, errno, "stat");
880
882
free(filename);
881
883
continue;
882
884
}
894
896
895
897
plugin *p = getplugin(dirst->d_name);
896
898
if(p == NULL){
897
perror("getplugin");
899
error(0, errno, "getplugin");
898
900
free(filename);
899
901
continue;
900
902
}
912
914
if(g != NULL){
913
915
for(char **a = g->argv + 1; *a != NULL; a++){
914
916
if(not add_argument(p, *a)){
915
perror("add_argument");
917
error(0, errno, "add_argument");
916
918
}
917
919
}
918
920
/* Add global environment variables */
919
921
for(char **e = g->environ; *e != NULL; e++){
920
922
if(not add_environment(p, *e, false)){
921
perror("add_environment");
923
error(0, errno, "add_environment");
922
924
}
923
925
}
924
926
}
929
931
if(p->environ[0] != NULL){
930
932
for(char **e = environ; *e != NULL; e++){
931
933
if(not add_environment(p, *e, false)){
932
perror("add_environment");
934
error(0, errno, "add_environment");
933
935
}
934
936
}
935
937
}
937
939
int pipefd[2];
938
940
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
939
941
if(ret == -1){
940
perror("pipe");
942
error(0, errno, "pipe");
941
943
exitstatus = EX_OSERR;
942
944
goto fallback;
943
945
}
944
946
/* Ask OS to automatic close the pipe on exec */
945
947
ret = set_cloexec_flag(pipefd[0]);
946
948
if(ret < 0){
947
perror("set_cloexec_flag");
949
error(0, errno, "set_cloexec_flag");
948
950
exitstatus = EX_OSERR;
949
951
goto fallback;
950
952
}
951
953
ret = set_cloexec_flag(pipefd[1]);
952
954
if(ret < 0){
953
perror("set_cloexec_flag");
955
error(0, errno, "set_cloexec_flag");
954
956
exitstatus = EX_OSERR;
955
957
goto fallback;
956
958
}
959
961
&sigchld_action.sa_mask,
960
962
NULL));
961
963
if(ret < 0){
962
perror("sigprocmask");
964
error(0, errno, "sigprocmask");
963
965
exitstatus = EX_OSERR;
964
966
goto fallback;
965
967
}
969
971
pid = fork();
970
972
} while(pid == -1 and errno == EINTR);
971
973
if(pid == -1){
972
perror("fork");
974
error(0, errno, "fork");
973
975
exitstatus = EX_OSERR;
974
976
goto fallback;
975
977
}
977
979
/* this is the child process */
978
980
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
979
981
if(ret < 0){
980
perror("sigaction");
982
error(0, errno, "sigaction");
981
983
_exit(EX_OSERR);
982
984
}
983
985
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
984
986
if(ret < 0){
985
perror("sigprocmask");
987
error(0, errno, "sigprocmask");
986
988
_exit(EX_OSERR);
987
989
}
988
990
989
991
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
990
992
if(ret == -1){
991
perror("dup2");
993
error(0, errno, "dup2");
992
994
_exit(EX_OSERR);
993
995
}
994
996
999
1001
}
1000
1002
if(p->environ[0] == NULL){
1001
1003
if(execv(filename, p->argv) < 0){
1002
perror("execv");
1004
error(0, errno, "execv for %s", filename);
1003
1005
_exit(EX_OSERR);
1004
1006
}
1005
1007
} else {
1006
1008
if(execve(filename, p->argv, p->environ) < 0){
1007
perror("execve");
1009
error(0, errno, "execve for %s", filename);
1008
1010
_exit(EX_OSERR);
1009
1011
}
1010
1012
}
1016
1018
free(filename);
1017
1019
plugin *new_plugin = getplugin(dirst->d_name);
1018
1020
if(new_plugin == NULL){
1019
perror("getplugin");
1021
error(0, errno, "getplugin");
1020
1022
ret = (int)(TEMP_FAILURE_RETRY
1021
1023
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1022
1024
NULL)));
1023
1025
if(ret < 0){
1024
perror("sigprocmask");
1026
error(0, errno, "sigprocmask");
1025
1027
}
1026
1028
exitstatus = EX_OSERR;
1027
1029
goto fallback;
1036
1038
&sigchld_action.sa_mask,
1037
1039
NULL));
1038
1040
if(ret < 0){
1039
perror("sigprocmask");
1041
error(0, errno, "sigprocmask");
1040
1042
exitstatus = EX_OSERR;
1041
1043
goto fallback;
1042
1044
}
1069
1071
fd_set rfds = rfds_all;
1070
1072
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1071
1073
if(select_ret == -1 and errno != EINTR){
1072
perror("select");
1074
error(0, errno, "select");
1073
1075
exitstatus = EX_OSERR;
1074
1076
goto fallback;
1075
1077
}
1111
1113
&sigchld_action.sa_mask,
1112
1114
NULL));
1113
1115
if(ret < 0){
1114
perror("sigprocmask");
1116
error(0, errno, "sigprocmask");
1115
1117
exitstatus = EX_OSERR;
1116
1118
goto fallback;
1117
1119
}
1125
1127
(sigprocmask(SIG_UNBLOCK,
1126
1128
&sigchld_action.sa_mask, NULL)));
1127
1129
if(ret < 0){
1128
perror("sigprocmask");
1130
error(0, errno, "sigprocmask");
1129
1131
exitstatus = EX_OSERR;
1130
1132
goto fallback;
1131
1133
}
1142
1144
bool bret = print_out_password(proc->buffer,
1143
1145
proc->buffer_length);
1144
1146
if(not bret){
1145
perror("print_out_password");
1147
error(0, errno, "print_out_password");
1146
1148
exitstatus = EX_IOERR;
1147
1149
}
1148
1150
goto fallback;
1161
1163
proc->buffer = realloc(proc->buffer, proc->buffer_size
1162
1164
+ (size_t) BUFFER_SIZE);
1163
1165
if(proc->buffer == NULL){
1164
perror("malloc");
1166
error(0, errno, "malloc");
1165
1167
exitstatus = EX_OSERR;
1166
1168
goto fallback;
1167
1169
}
1204
1206
}
1205
1207
bret = print_out_password(passwordbuffer, len);
1206
1208
if(not bret){
1207
perror("print_out_password");
1209
error(0, errno, "print_out_password");
1208
1210
exitstatus = EX_IOERR;
1209
1211
}
1210
1212
}
1212
1214
/* Restore old signal handler */
1213
1215
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1214
1216
if(ret == -1){
1215
perror("sigaction");
1217
error(0, errno, "sigaction");
1216
1218
exitstatus = EX_OSERR;
1217
1219
}
1218
1220
1234
1236
ret = kill(p->pid, SIGTERM);
1235
1237
if(ret == -1 and errno != ESRCH){
1236
1238
/* Set-uid proccesses might not get closed */
1237
perror("kill");
1239
error(0, errno, "kill");
1238
1240
}
1239
1241
}
1240
1242
}
1244
1246
ret = wait(NULL);
1245
1247
} while(ret >= 0);
1246
1248
if(errno != ECHILD){
1247
perror("wait");
1249
error(0, errno, "wait");
1248
1250
}
1249
1251
1250
1252
free_plugin_list();
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