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- Committer: Teddy Hogeborn
- Date: 2009-10-22 00:05:01 UTC
- Revision ID: teddy@fukt.bsnet.se-20091022000501-g792e99q5g1wkyet
Merge from release branch.
- files modified:
- Makefile
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
23
23
*/
24
24
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf() */
26
asprintf(), O_CLOEXEC */
27
27
#include <stddef.h> /* size_t, NULL */
28
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
29
EXIT_SUCCESS, realloc() */
30
30
#include <stdbool.h> /* bool, true, false */
31
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
34
34
stat, waitpid(), WIFEXITED(),
35
35
WEXITSTATUS(), wait(), pid_t,
36
36
uid_t, gid_t, getuid(), getgid(),
38
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
39
FD_SET(), FD_ISSET(), FD_CLR */
40
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS() */
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
42
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
44
#include <iso646.h> /* and, or, not */
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
45
46
readdir(), closedir(), dirfd() */
46
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
47
48
fcntl(), setuid(), setgid(),
52
53
close() */
53
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
54
55
FD_CLOEXEC */
55
#include <string.h> /* strsep, strlen(), asprintf() */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
56
58
#include <errno.h> /* errno */
57
59
#include <argp.h> /* struct argp_option, struct
58
60
argp_state, struct argp,
108
110
}
109
111
}
110
112
/* Create a new plugin */
111
plugin *new_plugin = malloc(sizeof(plugin));
113
plugin *new_plugin = NULL;
114
do {
115
new_plugin = malloc(sizeof(plugin));
116
} while(new_plugin == NULL and errno == EINTR);
112
117
if(new_plugin == NULL){
113
118
return NULL;
114
119
}
115
120
char *copy_name = NULL;
116
121
if(name != NULL){
117
copy_name = strdup(name);
122
do {
123
copy_name = strdup(name);
124
} while(copy_name == NULL and errno == EINTR);
118
125
if(copy_name == NULL){
119
126
free(new_plugin);
120
127
return NULL;
126
133
.disabled = false,
127
134
.next = plugin_list };
128
135
129
new_plugin->argv = malloc(sizeof(char *) * 2);
136
do {
137
new_plugin->argv = malloc(sizeof(char *) * 2);
138
} while(new_plugin->argv == NULL and errno == EINTR);
130
139
if(new_plugin->argv == NULL){
131
140
free(copy_name);
132
141
free(new_plugin);
135
144
new_plugin->argv[0] = copy_name;
136
145
new_plugin->argv[1] = NULL;
137
146
138
new_plugin->environ = malloc(sizeof(char *));
147
do {
148
new_plugin->environ = malloc(sizeof(char *));
149
} while(new_plugin->environ == NULL and errno == EINTR);
139
150
if(new_plugin->environ == NULL){
140
151
free(copy_name);
141
152
free(new_plugin->argv);
153
164
static bool add_to_char_array(const char *new, char ***array,
154
165
int *len){
155
166
/* Resize the pointed-to array to hold one more pointer */
156
*array = realloc(*array, sizeof(char *)
157
* (size_t) ((*len) + 2));
167
do {
168
*array = realloc(*array, sizeof(char *)
169
* (size_t) ((*len) + 2));
170
} while(*array == NULL and errno == EINTR);
158
171
/* Malloc check */
159
172
if(*array == NULL){
160
173
return false;
161
174
}
162
175
/* Make a copy of the new string */
163
char *copy = strdup(new);
176
char *copy;
177
do {
178
copy = strdup(new);
179
} while(copy == NULL and errno == EINTR);
164
180
if(copy == NULL){
165
181
return false;
166
182
}
192
208
if(strncmp(*e, def, namelen + 1) == 0){
193
209
/* It already exists */
194
210
if(replace){
195
char *new = realloc(*e, strlen(def) + 1);
211
char *new;
212
do {
213
new = realloc(*e, strlen(def) + 1);
214
} while(new == NULL and errno == EINTR);
196
215
if(new == NULL){
197
216
return false;
198
217
}
208
227
/*
209
228
* Based on the example in the GNU LibC manual chapter 13.13 "File
210
229
* Descriptor Flags".
211
* *Note File Descriptor Flags:(libc)Descriptor Flags.
230
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
212
231
*/
213
232
static int set_cloexec_flag(int fd){
214
int ret = fcntl(fd, F_GETFD, 0);
233
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
215
234
/* If reading the flags failed, return error indication now. */
216
235
if(ret < 0){
217
236
return ret;
218
237
}
219
238
/* Store modified flag word in the descriptor. */
220
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
239
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
240
ret | FD_CLOEXEC));
221
241
}
222
242
223
243
315
335
fd_set rfds_all;
316
336
int ret, maxfd = 0;
317
337
ssize_t sret;
318
intmax_t tmpmax;
319
338
uid_t uid = 65534;
320
339
gid_t gid = 65534;
321
340
bool debug = false;
380
399
381
400
error_t parse_opt(int key, char *arg, __attribute__((unused))
382
401
struct argp_state *state){
383
char *tmp;
384
402
switch(key){
403
char *tmp;
404
intmax_t tmpmax;
385
405
case 'g': /* --global-options */
386
406
if(arg != NULL){
387
407
char *plugin_option;
457
477
plugindir = strdup(arg);
458
478
if(plugindir == NULL){
459
479
perror("strdup");
460
}
480
}
461
481
break;
462
482
case 129: /* --config-file */
463
483
/* This is already done by parse_opt_config_file() */
527
547
if(argfile == NULL){
528
548
perror("strdup");
529
549
}
530
break;
550
break;
531
551
case 130: /* --userid */
532
552
case 131: /* --groupid */
533
553
case 132: /* --debug */
562
582
conffp = fopen(AFILE, "r");
563
583
} else {
564
584
conffp = fopen(argfile, "r");
565
}
585
}
566
586
if(conffp != NULL){
567
587
char *org_line = NULL;
568
588
char *p, *arg, *new_arg, *line;
612
632
goto fallback;
613
633
}
614
634
custom_argv[custom_argc-1] = new_arg;
615
custom_argv[custom_argc] = NULL;
635
custom_argv[custom_argc] = NULL;
616
636
}
617
637
}
638
do {
639
ret = fclose(conffp);
640
} while(ret == EOF and errno == EINTR);
641
if(ret == EOF){
642
perror("fclose");
643
exitstatus = EXIT_FAILURE;
644
goto fallback;
645
}
618
646
free(org_line);
619
647
} else {
620
648
/* Check for harmful errors and go to fallback. Other errors might
670
698
perror("setuid");
671
699
}
672
700
673
if(plugindir == NULL){
674
dir = opendir(PDIR);
675
} else {
676
dir = opendir(plugindir);
677
}
678
679
if(dir == NULL){
680
perror("Could not open plugin dir");
681
exitstatus = EXIT_FAILURE;
682
goto fallback;
683
}
684
685
/* Set the FD_CLOEXEC flag on the directory, if possible */
701
/* Open plugin directory with close_on_exec flag */
686
702
{
687
int dir_fd = dirfd(dir);
688
if(dir_fd >= 0){
689
ret = set_cloexec_flag(dir_fd);
690
if(ret < 0){
691
perror("set_cloexec_flag");
692
exitstatus = EXIT_FAILURE;
693
goto fallback;
694
}
703
int dir_fd = -1;
704
if(plugindir == NULL){
705
dir_fd = open(PDIR, O_RDONLY |
706
#ifdef O_CLOEXEC
707
O_CLOEXEC
708
#else /* not O_CLOEXEC */
709
0
710
#endif /* not O_CLOEXEC */
711
);
712
} else {
713
dir_fd = open(plugindir, O_RDONLY |
714
#ifdef O_CLOEXEC
715
O_CLOEXEC
716
#else /* not O_CLOEXEC */
717
0
718
#endif /* not O_CLOEXEC */
719
);
720
}
721
if(dir_fd == -1){
722
perror("Could not open plugin dir");
723
exitstatus = EXIT_FAILURE;
724
goto fallback;
725
}
726
727
#ifndef O_CLOEXEC
728
/* Set the FD_CLOEXEC flag on the directory */
729
ret = set_cloexec_flag(dir_fd);
730
if(ret < 0){
731
perror("set_cloexec_flag");
732
TEMP_FAILURE_RETRY(close(dir_fd));
733
exitstatus = EXIT_FAILURE;
734
goto fallback;
735
}
736
#endif /* O_CLOEXEC */
737
738
dir = fdopendir(dir_fd);
739
if(dir == NULL){
740
perror("Could not open plugin dir");
741
TEMP_FAILURE_RETRY(close(dir_fd));
742
exitstatus = EXIT_FAILURE;
743
goto fallback;
695
744
}
696
745
}
697
746
699
748
700
749
/* Read and execute any executable in the plugin directory*/
701
750
while(true){
702
dirst = readdir(dir);
751
do {
752
dirst = readdir(dir);
753
} while(dirst == NULL and errno == EINTR);
703
754
704
755
/* All directory entries have been processed */
705
756
if(dirst == NULL){
759
810
760
811
char *filename;
761
812
if(plugindir == NULL){
762
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
813
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
814
dirst->d_name));
763
815
} else {
764
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
816
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
817
plugindir,
818
dirst->d_name));
765
819
}
766
820
if(ret < 0){
767
821
perror("asprintf");
768
822
continue;
769
823
}
770
824
771
ret = stat(filename, &st);
825
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
772
826
if(ret == -1){
773
827
perror("stat");
774
828
free(filename);
776
830
}
777
831
778
832
/* Ignore non-executable files */
779
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
833
if(not S_ISREG(st.st_mode)
834
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
780
835
if(debug){
781
836
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
782
837
" with bad type or mode\n", filename);
828
883
}
829
884
830
885
int pipefd[2];
831
ret = pipe(pipefd);
886
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
832
887
if(ret == -1){
833
888
perror("pipe");
834
889
exitstatus = EXIT_FAILURE;
848
903
goto fallback;
849
904
}
850
905
/* Block SIGCHLD until process is safely in process list */
851
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
906
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
907
&sigchld_action.sa_mask,
908
NULL));
852
909
if(ret < 0){
853
910
perror("sigprocmask");
854
911
exitstatus = EXIT_FAILURE;
855
912
goto fallback;
856
913
}
857
914
/* Starting a new process to be watched */
858
pid_t pid = fork();
915
pid_t pid;
916
do {
917
pid = fork();
918
} while(pid == -1 and errno == EINTR);
859
919
if(pid == -1){
860
920
perror("fork");
861
921
exitstatus = EXIT_FAILURE;
899
959
/* no return */
900
960
}
901
961
/* Parent process */
902
close(pipefd[1]); /* Close unused write end of pipe */
962
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
963
pipe */
903
964
free(filename);
904
965
plugin *new_plugin = getplugin(dirst->d_name);
905
966
if(new_plugin == NULL){
906
967
perror("getplugin");
907
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
968
ret = (int)(TEMP_FAILURE_RETRY
969
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
970
NULL)));
908
971
if(ret < 0){
909
972
perror("sigprocmask");
910
973
}
917
980
918
981
/* Unblock SIGCHLD so signal handler can be run if this process
919
982
has already completed */
920
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
983
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
984
&sigchld_action.sa_mask,
985
NULL));
921
986
if(ret < 0){
922
987
perror("sigprocmask");
923
988
exitstatus = EXIT_FAILURE;
924
989
goto fallback;
925
990
}
926
991
927
FD_SET(new_plugin->fd, &rfds_all);
992
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
993
-Wconversion */
928
994
929
995
if(maxfd < new_plugin->fd){
930
996
maxfd = new_plugin->fd;
931
997
}
932
998
}
933
999
934
closedir(dir);
1000
TEMP_FAILURE_RETRY(closedir(dir));
935
1001
dir = NULL;
936
1002
free_plugin(getplugin(NULL));
937
1003
950
1016
while(plugin_list){
951
1017
fd_set rfds = rfds_all;
952
1018
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
953
if(select_ret == -1){
1019
if(select_ret == -1 and errno != EINTR){
954
1020
perror("select");
955
1021
exitstatus = EXIT_FAILURE;
956
1022
goto fallback;
973
1039
WEXITSTATUS(proc->status));
974
1040
} else if(WIFSIGNALED(proc->status)){
975
1041
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
976
" signal %d\n", proc->name,
1042
" signal %d: %s\n", proc->name,
977
1043
(intmax_t) (proc->pid),
978
WTERMSIG(proc->status));
1044
WTERMSIG(proc->status),
1045
strsignal(WTERMSIG(proc->status)));
979
1046
} else if(WCOREDUMP(proc->status)){
980
1047
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
981
1048
" core\n", proc->name, (intmax_t) (proc->pid));
983
1050
}
984
1051
985
1052
/* Remove the plugin */
986
FD_CLR(proc->fd, &rfds_all);
1053
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1054
-Wconversion */
987
1055
988
1056
/* Block signal while modifying process_list */
989
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1057
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1058
(SIG_BLOCK,
1059
&sigchld_action.sa_mask,
1060
NULL));
990
1061
if(ret < 0){
991
1062
perror("sigprocmask");
992
1063
exitstatus = EXIT_FAILURE;
998
1069
proc = next_plugin;
999
1070
1000
1071
/* We are done modifying process list, so unblock signal */
1001
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1002
NULL);
1072
ret = (int)(TEMP_FAILURE_RETRY
1073
(sigprocmask(SIG_UNBLOCK,
1074
&sigchld_action.sa_mask, NULL)));
1003
1075
if(ret < 0){
1004
1076
perror("sigprocmask");
1005
1077
exitstatus = EXIT_FAILURE;
1025
1097
}
1026
1098
1027
1099
/* This process has not completed. Does it have any output? */
1028
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1100
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1101
warning from
1102
-Wconversion */
1029
1103
/* This process had nothing to say at this time */
1030
1104
proc = proc->next;
1031
1105
continue;
1042
1116
proc->buffer_size += BUFFER_SIZE;
1043
1117
}
1044
1118
/* Read from the process */
1045
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1046
BUFFER_SIZE);
1119
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1120
proc->buffer
1121
+ proc->buffer_length,
1122
BUFFER_SIZE));
1047
1123
if(sret < 0){
1048
1124
/* Read error from this process; ignore the error */
1049
1125
proc = proc->next;
1111
1187
}
1112
1188
1113
1189
/* Wait for any remaining child processes to terminate */
1114
do{
1190
do {
1115
1191
ret = wait(NULL);
1116
1192
} while(ret >= 0);
1117
1193
if(errno != ECHILD){
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Version: 2.0.2.dev0