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- Committer: teddy at bsnet
- Date: 2010-09-27 17:39:03 UTC
- Revision ID: teddy@fukt.bsnet.se-20100927173903-9s5e6a3hl5iswmp7
* mandos: Fixed "--help" output.
* mandos.xml (SYNOPSIS, OPTIONS): Document new option "--debuglevel".
* mandos.xml (SYNOPSIS, OPTIONS): Document new option "--debuglevel".
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
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
265
268
/* No child processes */
266
269
break;
267
270
}
268
perror("waitpid");
271
error(0, errno, "waitpid");
269
272
}
270
273
271
274
/* A child exited, find it in process_list */
356
359
sigemptyset(&sigchld_action.sa_mask);
357
360
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
358
361
if(ret == -1){
359
perror("sigaddset");
360
exitstatus = EXIT_FAILURE;
362
error(0, errno, "sigaddset");
363
exitstatus = EX_OSERR;
361
364
goto fallback;
362
365
}
363
366
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
364
367
if(ret == -1){
365
perror("sigaction");
366
exitstatus = EXIT_FAILURE;
368
error(0, errno, "sigaction");
369
exitstatus = EX_OSERR;
367
370
goto fallback;
368
371
}
369
372
598
601
case ENOMEM:
599
602
default:
600
603
errno = ret;
601
perror("argp_parse");
604
error(0, errno, "argp_parse");
602
605
exitstatus = EX_OSERR;
603
606
goto fallback;
604
607
case EINVAL:
625
628
custom_argc = 1;
626
629
custom_argv = malloc(sizeof(char*) * 2);
627
630
if(custom_argv == NULL){
628
perror("malloc");
629
exitstatus = EXIT_FAILURE;
631
error(0, errno, "malloc");
632
exitstatus = EX_OSERR;
630
633
goto fallback;
631
634
}
632
635
custom_argv[0] = argv[0];
648
651
}
649
652
new_arg = strdup(p);
650
653
if(new_arg == NULL){
651
perror("strdup");
652
exitstatus = EXIT_FAILURE;
654
error(0, errno, "strdup");
655
exitstatus = EX_OSERR;
653
656
free(org_line);
654
657
goto fallback;
655
658
}
658
661
custom_argv = realloc(custom_argv, sizeof(char *)
659
662
* ((unsigned int) custom_argc + 1));
660
663
if(custom_argv == NULL){
661
perror("realloc");
662
exitstatus = EXIT_FAILURE;
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
663
666
free(org_line);
664
667
goto fallback;
665
668
}
671
674
ret = fclose(conffp);
672
675
} while(ret == EOF and errno == EINTR);
673
676
if(ret == EOF){
674
perror("fclose");
675
exitstatus = EXIT_FAILURE;
677
error(0, errno, "fclose");
678
exitstatus = EX_IOERR;
676
679
goto fallback;
677
680
}
678
681
free(org_line);
680
683
/* Check for harmful errors and go to fallback. Other errors might
681
684
not affect opening plugins */
682
685
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
683
perror("fopen");
684
exitstatus = EXIT_FAILURE;
686
error(0, errno, "fopen");
687
exitstatus = EX_OSERR;
685
688
goto fallback;
686
689
}
687
690
}
697
700
case ENOMEM:
698
701
default:
699
702
errno = ret;
700
perror("argp_parse");
703
error(0, errno, "argp_parse");
701
704
exitstatus = EX_OSERR;
702
705
goto fallback;
703
706
case EINVAL:
717
720
case ENOMEM:
718
721
default:
719
722
errno = ret;
720
perror("argp_parse");
723
error(0, errno, "argp_parse");
721
724
exitstatus = EX_OSERR;
722
725
goto fallback;
723
726
case EINVAL:
742
745
/* Strip permissions down to nobody */
743
746
setgid(gid);
744
747
if(ret == -1){
745
perror("setgid");
748
error(0, errno, "setgid");
746
749
}
747
750
ret = setuid(uid);
748
751
if(ret == -1){
749
perror("setuid");
752
error(0, errno, "setuid");
750
753
}
751
754
752
755
/* Open plugin directory with close_on_exec flag */
770
773
);
771
774
}
772
775
if(dir_fd == -1){
773
perror("Could not open plugin dir");
774
exitstatus = EXIT_FAILURE;
776
error(0, errno, "Could not open plugin dir");
777
exitstatus = EX_UNAVAILABLE;
775
778
goto fallback;
776
779
}
777
780
779
782
/* Set the FD_CLOEXEC flag on the directory */
780
783
ret = set_cloexec_flag(dir_fd);
781
784
if(ret < 0){
782
perror("set_cloexec_flag");
785
error(0, errno, "set_cloexec_flag");
783
786
TEMP_FAILURE_RETRY(close(dir_fd));
784
exitstatus = EXIT_FAILURE;
787
exitstatus = EX_OSERR;
785
788
goto fallback;
786
789
}
787
790
#endif /* O_CLOEXEC */
788
791
789
792
dir = fdopendir(dir_fd);
790
793
if(dir == NULL){
791
perror("Could not open plugin dir");
794
error(0, errno, "Could not open plugin dir");
792
795
TEMP_FAILURE_RETRY(close(dir_fd));
793
exitstatus = EXIT_FAILURE;
796
exitstatus = EX_OSERR;
794
797
goto fallback;
795
798
}
796
799
}
806
809
/* All directory entries have been processed */
807
810
if(dirst == NULL){
808
811
if(errno == EBADF){
809
perror("readdir");
810
exitstatus = EXIT_FAILURE;
812
error(0, errno, "readdir");
813
exitstatus = EX_IOERR;
811
814
goto fallback;
812
815
}
813
816
break;
843
846
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
844
847
size_t suf_len = strlen(*suf);
845
848
if((d_name_len >= suf_len)
846
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
849
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
847
850
== 0)){
848
851
if(debug){
849
852
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
869
872
dirst->d_name));
870
873
}
871
874
if(ret < 0){
872
perror("asprintf");
875
error(0, errno, "asprintf");
873
876
continue;
874
877
}
875
878
876
879
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
877
880
if(ret == -1){
878
perror("stat");
881
error(0, errno, "stat");
879
882
free(filename);
880
883
continue;
881
884
}
893
896
894
897
plugin *p = getplugin(dirst->d_name);
895
898
if(p == NULL){
896
perror("getplugin");
899
error(0, errno, "getplugin");
897
900
free(filename);
898
901
continue;
899
902
}
911
914
if(g != NULL){
912
915
for(char **a = g->argv + 1; *a != NULL; a++){
913
916
if(not add_argument(p, *a)){
914
perror("add_argument");
917
error(0, errno, "add_argument");
915
918
}
916
919
}
917
920
/* Add global environment variables */
918
921
for(char **e = g->environ; *e != NULL; e++){
919
922
if(not add_environment(p, *e, false)){
920
perror("add_environment");
923
error(0, errno, "add_environment");
921
924
}
922
925
}
923
926
}
928
931
if(p->environ[0] != NULL){
929
932
for(char **e = environ; *e != NULL; e++){
930
933
if(not add_environment(p, *e, false)){
931
perror("add_environment");
934
error(0, errno, "add_environment");
932
935
}
933
936
}
934
937
}
936
939
int pipefd[2];
937
940
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
938
941
if(ret == -1){
939
perror("pipe");
940
exitstatus = EXIT_FAILURE;
942
error(0, errno, "pipe");
943
exitstatus = EX_OSERR;
941
944
goto fallback;
942
945
}
943
946
/* Ask OS to automatic close the pipe on exec */
944
947
ret = set_cloexec_flag(pipefd[0]);
945
948
if(ret < 0){
946
perror("set_cloexec_flag");
947
exitstatus = EXIT_FAILURE;
949
error(0, errno, "set_cloexec_flag");
950
exitstatus = EX_OSERR;
948
951
goto fallback;
949
952
}
950
953
ret = set_cloexec_flag(pipefd[1]);
951
954
if(ret < 0){
952
perror("set_cloexec_flag");
953
exitstatus = EXIT_FAILURE;
955
error(0, errno, "set_cloexec_flag");
956
exitstatus = EX_OSERR;
954
957
goto fallback;
955
958
}
956
959
/* Block SIGCHLD until process is safely in process list */
958
961
&sigchld_action.sa_mask,
959
962
NULL));
960
963
if(ret < 0){
961
perror("sigprocmask");
962
exitstatus = EXIT_FAILURE;
964
error(0, errno, "sigprocmask");
965
exitstatus = EX_OSERR;
963
966
goto fallback;
964
967
}
965
968
/* Starting a new process to be watched */
968
971
pid = fork();
969
972
} while(pid == -1 and errno == EINTR);
970
973
if(pid == -1){
971
perror("fork");
972
exitstatus = EXIT_FAILURE;
974
error(0, errno, "fork");
975
exitstatus = EX_OSERR;
973
976
goto fallback;
974
977
}
975
978
if(pid == 0){
976
979
/* this is the child process */
977
980
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
978
981
if(ret < 0){
979
perror("sigaction");
980
_exit(EXIT_FAILURE);
982
error(0, errno, "sigaction");
983
_exit(EX_OSERR);
981
984
}
982
985
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
983
986
if(ret < 0){
984
perror("sigprocmask");
985
_exit(EXIT_FAILURE);
987
error(0, errno, "sigprocmask");
988
_exit(EX_OSERR);
986
989
}
987
990
988
991
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
989
992
if(ret == -1){
990
perror("dup2");
991
_exit(EXIT_FAILURE);
993
error(0, errno, "dup2");
994
_exit(EX_OSERR);
992
995
}
993
996
994
997
if(dirfd(dir) < 0){
998
1001
}
999
1002
if(p->environ[0] == NULL){
1000
1003
if(execv(filename, p->argv) < 0){
1001
perror("execv");
1002
_exit(EXIT_FAILURE);
1004
error(0, errno, "execv for %s", filename);
1005
_exit(EX_OSERR);
1003
1006
}
1004
1007
} else {
1005
1008
if(execve(filename, p->argv, p->environ) < 0){
1006
perror("execve");
1007
_exit(EXIT_FAILURE);
1009
error(0, errno, "execve for %s", filename);
1010
_exit(EX_OSERR);
1008
1011
}
1009
1012
}
1010
1013
/* no return */
1015
1018
free(filename);
1016
1019
plugin *new_plugin = getplugin(dirst->d_name);
1017
1020
if(new_plugin == NULL){
1018
perror("getplugin");
1021
error(0, errno, "getplugin");
1019
1022
ret = (int)(TEMP_FAILURE_RETRY
1020
1023
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1021
1024
NULL)));
1022
1025
if(ret < 0){
1023
perror("sigprocmask");
1026
error(0, errno, "sigprocmask");
1024
1027
}
1025
exitstatus = EXIT_FAILURE;
1028
exitstatus = EX_OSERR;
1026
1029
goto fallback;
1027
1030
}
1028
1031
1035
1038
&sigchld_action.sa_mask,
1036
1039
NULL));
1037
1040
if(ret < 0){
1038
perror("sigprocmask");
1039
exitstatus = EXIT_FAILURE;
1041
error(0, errno, "sigprocmask");
1042
exitstatus = EX_OSERR;
1040
1043
goto fallback;
1041
1044
}
1042
1045
1068
1071
fd_set rfds = rfds_all;
1069
1072
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1070
1073
if(select_ret == -1 and errno != EINTR){
1071
perror("select");
1072
exitstatus = EXIT_FAILURE;
1074
error(0, errno, "select");
1075
exitstatus = EX_OSERR;
1073
1076
goto fallback;
1074
1077
}
1075
1078
/* OK, now either a process completed, or something can be read
1110
1113
&sigchld_action.sa_mask,
1111
1114
NULL));
1112
1115
if(ret < 0){
1113
perror("sigprocmask");
1114
exitstatus = EXIT_FAILURE;
1116
error(0, errno, "sigprocmask");
1117
exitstatus = EX_OSERR;
1115
1118
goto fallback;
1116
1119
}
1117
1120
1124
1127
(sigprocmask(SIG_UNBLOCK,
1125
1128
&sigchld_action.sa_mask, NULL)));
1126
1129
if(ret < 0){
1127
perror("sigprocmask");
1128
exitstatus = EXIT_FAILURE;
1130
error(0, errno, "sigprocmask");
1131
exitstatus = EX_OSERR;
1129
1132
goto fallback;
1130
1133
}
1131
1134
1141
1144
bool bret = print_out_password(proc->buffer,
1142
1145
proc->buffer_length);
1143
1146
if(not bret){
1144
perror("print_out_password");
1145
exitstatus = EXIT_FAILURE;
1147
error(0, errno, "print_out_password");
1148
exitstatus = EX_IOERR;
1146
1149
}
1147
1150
goto fallback;
1148
1151
}
1160
1163
proc->buffer = realloc(proc->buffer, proc->buffer_size
1161
1164
+ (size_t) BUFFER_SIZE);
1162
1165
if(proc->buffer == NULL){
1163
perror("malloc");
1164
exitstatus = EXIT_FAILURE;
1166
error(0, errno, "malloc");
1167
exitstatus = EX_OSERR;
1165
1168
goto fallback;
1166
1169
}
1167
1170
proc->buffer_size += BUFFER_SIZE;
1188
1191
1189
1192
fallback:
1190
1193
1191
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1194
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1195
and exitstatus != EX_OK)){
1192
1196
/* Fallback if all plugins failed, none are found or an error
1193
1197
occured */
1194
1198
bool bret;
1202
1206
}
1203
1207
bret = print_out_password(passwordbuffer, len);
1204
1208
if(not bret){
1205
perror("print_out_password");
1206
exitstatus = EXIT_FAILURE;
1209
error(0, errno, "print_out_password");
1210
exitstatus = EX_IOERR;
1207
1211
}
1208
1212
}
1209
1213
1210
1214
/* Restore old signal handler */
1211
1215
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1212
1216
if(ret == -1){
1213
perror("sigaction");
1214
exitstatus = EXIT_FAILURE;
1217
error(0, errno, "sigaction");
1218
exitstatus = EX_OSERR;
1215
1219
}
1216
1220
1217
1221
if(custom_argv != NULL){
1232
1236
ret = kill(p->pid, SIGTERM);
1233
1237
if(ret == -1 and errno != ESRCH){
1234
1238
/* Set-uid proccesses might not get closed */
1235
perror("kill");
1239
error(0, errno, "kill");
1236
1240
}
1237
1241
}
1238
1242
}
1242
1246
ret = wait(NULL);
1243
1247
} while(ret >= 0);
1244
1248
if(errno != ECHILD){
1245
perror("wait");
1249
error(0, errno, "wait");
1246
1250
}
1247
1251
1248
1252
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0