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- Committer: Teddy Hogeborn
- Date: 2009-05-23 05:59:52 UTC
- Revision ID: teddy@fukt.bsnet.se-20090523055952-wvnp7le0io6ttqni
Merge from release branch.
added
removed
plugin-runner.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
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(), WTERMSIG(),
42
WCOREDUMP() */
41
WEXITSTATUS() */
43
42
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
43
#include <iso646.h> /* and, or, not */
45
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
53
52
close() */
54
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
54
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
55
#include <string.h> /* strsep, strlen(), asprintf() */
58
56
#include <errno.h> /* errno */
59
57
#include <argp.h> /* struct argp_option, struct
60
58
argp_state, struct argp,
110
108
}
111
109
}
112
110
/* Create a new plugin */
113
plugin *new_plugin = NULL;
114
do {
115
new_plugin = malloc(sizeof(plugin));
116
} while(new_plugin == NULL and errno == EINTR);
111
plugin *new_plugin = malloc(sizeof(plugin));
117
112
if(new_plugin == NULL){
118
113
return NULL;
119
114
}
120
115
char *copy_name = NULL;
121
116
if(name != NULL){
122
do {
123
copy_name = strdup(name);
124
} while(copy_name == NULL and errno == EINTR);
117
copy_name = strdup(name);
125
118
if(copy_name == NULL){
126
119
free(new_plugin);
127
120
return NULL;
133
126
.disabled = false,
134
127
.next = plugin_list };
135
128
136
do {
137
new_plugin->argv = malloc(sizeof(char *) * 2);
138
} while(new_plugin->argv == NULL and errno == EINTR);
129
new_plugin->argv = malloc(sizeof(char *) * 2);
139
130
if(new_plugin->argv == NULL){
140
131
free(copy_name);
141
132
free(new_plugin);
144
135
new_plugin->argv[0] = copy_name;
145
136
new_plugin->argv[1] = NULL;
146
137
147
do {
148
new_plugin->environ = malloc(sizeof(char *));
149
} while(new_plugin->environ == NULL and errno == EINTR);
138
new_plugin->environ = malloc(sizeof(char *));
150
139
if(new_plugin->environ == NULL){
151
140
free(copy_name);
152
141
free(new_plugin->argv);
164
153
static bool add_to_char_array(const char *new, char ***array,
165
154
int *len){
166
155
/* Resize the pointed-to array to hold one more pointer */
167
do {
168
*array = realloc(*array, sizeof(char *)
169
* (size_t) ((*len) + 2));
170
} while(*array == NULL and errno == EINTR);
156
*array = realloc(*array, sizeof(char *)
157
* (size_t) ((*len) + 2));
171
158
/* Malloc check */
172
159
if(*array == NULL){
173
160
return false;
174
161
}
175
162
/* Make a copy of the new string */
176
char *copy;
177
do {
178
copy = strdup(new);
179
} while(copy == NULL and errno == EINTR);
163
char *copy = strdup(new);
180
164
if(copy == NULL){
181
165
return false;
182
166
}
208
192
if(strncmp(*e, def, namelen + 1) == 0){
209
193
/* It already exists */
210
194
if(replace){
211
char *new;
212
do {
213
new = realloc(*e, strlen(def) + 1);
214
} while(new == NULL and errno == EINTR);
195
char *new = realloc(*e, strlen(def) + 1);
215
196
if(new == NULL){
216
197
return false;
217
198
}
227
208
/*
228
209
* Based on the example in the GNU LibC manual chapter 13.13 "File
229
210
* Descriptor Flags".
230
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
211
* *Note File Descriptor Flags:(libc)Descriptor Flags.
231
212
*/
232
213
static int set_cloexec_flag(int fd){
233
int ret = TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
214
int ret = fcntl(fd, F_GETFD, 0);
234
215
/* If reading the flags failed, return error indication now. */
235
216
if(ret < 0){
236
217
return ret;
237
218
}
238
219
/* Store modified flag word in the descriptor. */
239
return TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD, ret | FD_CLOEXEC));
220
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
240
221
}
241
222
242
223
334
315
fd_set rfds_all;
335
316
int ret, maxfd = 0;
336
317
ssize_t sret;
318
intmax_t tmpmax;
337
319
uid_t uid = 65534;
338
320
gid_t gid = 65534;
339
321
bool debug = false;
398
380
399
381
error_t parse_opt(int key, char *arg, __attribute__((unused))
400
382
struct argp_state *state){
383
char *tmp;
401
384
switch(key){
402
char *tmp;
403
intmax_t tmpmax;
404
385
case 'g': /* --global-options */
405
386
if(arg != NULL){
406
387
char *plugin_option;
476
457
plugindir = strdup(arg);
477
458
if(plugindir == NULL){
478
459
perror("strdup");
479
}
460
}
480
461
break;
481
462
case 129: /* --config-file */
482
463
/* This is already done by parse_opt_config_file() */
546
527
if(argfile == NULL){
547
528
perror("strdup");
548
529
}
549
break;
530
break;
550
531
case 130: /* --userid */
551
532
case 131: /* --groupid */
552
533
case 132: /* --debug */
581
562
conffp = fopen(AFILE, "r");
582
563
} else {
583
564
conffp = fopen(argfile, "r");
584
}
565
}
585
566
if(conffp != NULL){
586
567
char *org_line = NULL;
587
568
char *p, *arg, *new_arg, *line;
631
612
goto fallback;
632
613
}
633
614
custom_argv[custom_argc-1] = new_arg;
634
custom_argv[custom_argc] = NULL;
615
custom_argv[custom_argc] = NULL;
635
616
}
636
617
}
637
do {
638
ret = fclose(conffp);
639
} while(ret == EOF and errno == EINTR);
640
if(ret == EOF){
641
perror("fclose");
642
exitstatus = EXIT_FAILURE;
643
goto fallback;
644
}
645
618
free(org_line);
646
619
} else {
647
620
/* Check for harmful errors and go to fallback. Other errors might
726
699
727
700
/* Read and execute any executable in the plugin directory*/
728
701
while(true){
729
do {
730
dirst = readdir(dir);
731
} while(dirst == NULL and errno == EINTR);
702
dirst = readdir(dir);
732
703
733
704
/* All directory entries have been processed */
734
705
if(dirst == NULL){
788
759
789
760
char *filename;
790
761
if(plugindir == NULL){
791
ret = TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
792
dirst->d_name));
762
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
793
763
} else {
794
ret = TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s", plugindir,
795
dirst->d_name));
764
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
796
765
}
797
766
if(ret < 0){
798
767
perror("asprintf");
799
768
continue;
800
769
}
801
770
802
ret = TEMP_FAILURE_RETRY(stat(filename, &st));
771
ret = stat(filename, &st);
803
772
if(ret == -1){
804
773
perror("stat");
805
774
free(filename);
807
776
}
808
777
809
778
/* Ignore non-executable files */
810
if(not S_ISREG(st.st_mode)
811
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
779
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
812
780
if(debug){
813
781
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
814
782
" with bad type or mode\n", filename);
860
828
}
861
829
862
830
int pipefd[2];
863
ret = TEMP_FAILURE_RETRY(pipe(pipefd));
831
ret = pipe(pipefd);
864
832
if(ret == -1){
865
833
perror("pipe");
866
834
exitstatus = EXIT_FAILURE;
880
848
goto fallback;
881
849
}
882
850
/* Block SIGCHLD until process is safely in process list */
883
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
884
&sigchld_action.sa_mask,
885
NULL));
851
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
886
852
if(ret < 0){
887
853
perror("sigprocmask");
888
854
exitstatus = EXIT_FAILURE;
889
855
goto fallback;
890
856
}
891
857
/* Starting a new process to be watched */
892
pid_t pid;
893
do {
894
pid = fork();
895
} while(pid == -1 and errno == EINTR);
858
pid_t pid = fork();
896
859
if(pid == -1){
897
860
perror("fork");
898
861
exitstatus = EXIT_FAILURE;
936
899
/* no return */
937
900
}
938
901
/* Parent process */
939
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
940
pipe */
902
close(pipefd[1]); /* Close unused write end of pipe */
941
903
free(filename);
942
904
plugin *new_plugin = getplugin(dirst->d_name);
943
905
if(new_plugin == NULL){
944
906
perror("getplugin");
945
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
946
&sigchld_action.sa_mask,
947
NULL));
907
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
948
908
if(ret < 0){
949
909
perror("sigprocmask");
950
910
}
957
917
958
918
/* Unblock SIGCHLD so signal handler can be run if this process
959
919
has already completed */
960
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
961
&sigchld_action.sa_mask,
962
NULL));
920
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
963
921
if(ret < 0){
964
922
perror("sigprocmask");
965
923
exitstatus = EXIT_FAILURE;
973
931
}
974
932
}
975
933
976
TEMP_FAILURE_RETRY(closedir(dir));
934
closedir(dir);
977
935
dir = NULL;
978
936
free_plugin(getplugin(NULL));
979
937
992
950
while(plugin_list){
993
951
fd_set rfds = rfds_all;
994
952
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
995
if(select_ret == -1 and errno != EINTR){
953
if(select_ret == -1){
996
954
perror("select");
997
955
exitstatus = EXIT_FAILURE;
998
956
goto fallback;
1015
973
WEXITSTATUS(proc->status));
1016
974
} else if(WIFSIGNALED(proc->status)){
1017
975
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1018
" signal %d: %s\n", proc->name,
976
" signal %d\n", proc->name,
1019
977
(intmax_t) (proc->pid),
1020
WTERMSIG(proc->status),
1021
strsignal(WTERMSIG(proc->status)));
978
WTERMSIG(proc->status));
1022
979
} else if(WCOREDUMP(proc->status)){
1023
980
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1024
981
" core\n", proc->name, (intmax_t) (proc->pid));
1029
986
FD_CLR(proc->fd, &rfds_all);
1030
987
1031
988
/* Block signal while modifying process_list */
1032
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1033
&sigchld_action.sa_mask,
1034
NULL));
989
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1035
990
if(ret < 0){
1036
991
perror("sigprocmask");
1037
992
exitstatus = EXIT_FAILURE;
1043
998
proc = next_plugin;
1044
999
1045
1000
/* We are done modifying process list, so unblock signal */
1046
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1047
&sigchld_action.sa_mask,
1048
NULL));
1001
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1002
NULL);
1049
1003
if(ret < 0){
1050
1004
perror("sigprocmask");
1051
1005
exitstatus = EXIT_FAILURE;
1088
1042
proc->buffer_size += BUFFER_SIZE;
1089
1043
}
1090
1044
/* Read from the process */
1091
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1092
proc->buffer
1093
+ proc->buffer_length,
1094
BUFFER_SIZE));
1045
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1046
BUFFER_SIZE);
1095
1047
if(sret < 0){
1096
1048
/* Read error from this process; ignore the error */
1097
1049
proc = proc->next;
1159
1111
}
1160
1112
1161
1113
/* Wait for any remaining child processes to terminate */
1162
do {
1114
do{
1163
1115
ret = wait(NULL);
1164
1116
} while(ret >= 0);
1165
1117
if(errno != ECHILD){
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