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- Committer: Teddy Hogeborn
- Date: 2008-08-31 20:01:03 UTC
- Revision ID: teddy@fukt.bsnet.se-20080831200103-wvjp5oagtxj7s25g
* plugin-runner.c: Break a couple of long lines.
added
removed
plugin-runner.c
72
72
const char *argp_program_version = "plugin-runner 1.0";
73
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
74
75
struct process;
76
77
typedef struct process{
75
struct plugin;
76
77
typedef struct plugin{
78
char *name; /* can be NULL or any plugin name */
79
char **argv;
80
int argc;
81
char **environ;
82
int envc;
83
bool disabled;
84
85
/* Variables used for running processes*/
78
86
pid_t pid;
79
87
int fd;
80
88
char *buffer;
83
91
bool eof;
84
92
volatile bool completed;
85
93
volatile int status;
86
struct process *next;
87
} process;
88
89
typedef struct plugin{
90
char *name; /* can be NULL or any plugin name */
91
char **argv;
92
int argc;
93
char **environ;
94
int envc;
95
bool disabled;
96
94
struct plugin *next;
97
95
} plugin;
98
96
99
static plugin *getplugin(char *name, plugin **plugin_list){
100
for (plugin *p = *plugin_list; p != NULL; p = p->next){
97
static plugin *plugin_list = NULL;
98
99
/* Gets a existing plugin based on name,
100
or if none is found, creates a new one */
101
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
103
for (plugin *p = plugin_list; p != NULL; p = p->next){
101
104
if ((p->name == name)
102
105
or (p->name and name and (strcmp(p->name, name) == 0))){
103
106
return p;
115
118
return NULL;
116
119
}
117
120
}
118
121
119
122
*new_plugin = (plugin) { .name = copy_name,
120
123
.argc = 1,
121
.envc = 0,
122
124
.disabled = false,
123
.next = *plugin_list };
125
.next = plugin_list };
124
126
125
127
new_plugin->argv = malloc(sizeof(char *) * 2);
126
128
if (new_plugin->argv == NULL){
139
141
return NULL;
140
142
}
141
143
new_plugin->environ[0] = NULL;
144
142
145
/* Append the new plugin to the list */
143
*plugin_list = new_plugin;
146
plugin_list = new_plugin;
144
147
return new_plugin;
145
148
}
146
149
183
186
return add_to_char_array(def, &(p->environ), &(p->envc));
184
187
}
185
188
186
187
189
/*
188
190
* Based on the example in the GNU LibC manual chapter 13.13 "File
189
191
* Descriptor Flags".
200
202
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
201
203
}
202
204
203
process *process_list = NULL;
204
205
205
206
/* Mark processes as completed when they exit, and save their exit
206
207
status. */
207
208
void handle_sigchld(__attribute__((unused)) int sig){
208
209
while(true){
209
process *proc = process_list;
210
plugin *proc = plugin_list;
210
211
int status;
211
212
pid_t pid = waitpid(-1, &status, WNOHANG);
212
213
if(pid == 0){
234
235
}
235
236
}
236
237
238
/* Prints out a password to stdout */
237
239
bool print_out_password(const char *buffer, size_t length){
238
240
ssize_t ret;
239
241
if(length>0 and buffer[length-1] == '\n'){
249
251
return true;
250
252
}
251
253
252
static void free_plugin_list(plugin *plugin_list){
253
for(plugin *next; plugin_list != NULL; plugin_list = next){
254
next = plugin_list->next;
255
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
256
free(*arg);
257
}
258
free(plugin_list->argv);
259
for(char **env = plugin_list->environ; *env != NULL; env++){
260
free(*env);
261
}
262
free(plugin_list->environ);
263
free(plugin_list);
254
/* Removes and free a plugin from the plugin list */
255
static void free_plugin(plugin *plugin_node){
256
257
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
258
free(*arg);
259
}
260
free(plugin_node->argv);
261
for(char **env = plugin_node->environ; *env != NULL; env++){
262
free(*env);
263
}
264
free(plugin_node->environ);
265
free(plugin_node->buffer);
266
267
/* Removes the plugin from the singly-linked list */
268
if(plugin_node == plugin_list){
269
/* First one - simple */
270
plugin_list = plugin_list->next;
271
} else {
272
/* Second one or later */
273
for(plugin *p = plugin_list; p != NULL; p = p->next){
274
if(p->next == plugin_node){
275
p->next = plugin_node->next;
276
break;
277
}
278
}
279
}
280
281
free(plugin_node);
282
}
283
284
static void free_plugin_list(void){
285
while(plugin_list != NULL){
286
free_plugin(plugin_list);
264
287
}
265
288
}
266
289
333
356
{ .name = NULL }
334
357
};
335
358
336
error_t parse_opt (int key, char *arg, struct argp_state *state) {
359
error_t parse_opt (int key, char *arg, __attribute__((unused))
360
struct argp_state *state) {
337
361
/* Get the INPUT argument from `argp_parse', which we know is a
338
362
pointer to our plugin list pointer. */
339
plugin **plugins = state->input;
340
363
switch (key) {
341
case 'g':
364
case 'g': /* --global-options */
342
365
if (arg != NULL){
343
366
char *p;
344
367
while((p = strsep(&arg, ",")) != NULL){
345
368
if(p[0] == '\0'){
346
369
continue;
347
370
}
348
if(not add_argument(getplugin(NULL, plugins), p)){
371
if(not add_argument(getplugin(NULL), p)){
349
372
perror("add_argument");
350
373
return ARGP_ERR_UNKNOWN;
351
374
}
352
375
}
353
376
}
354
377
break;
355
case 'e':
378
case 'e': /* --global-envs */
356
379
if(arg == NULL){
357
380
break;
358
381
}
361
384
if(envdef == NULL){
362
385
break;
363
386
}
364
if(not add_environment(getplugin(NULL, plugins), envdef)){
387
if(not add_environment(getplugin(NULL), envdef)){
365
388
perror("add_environment");
366
389
}
367
390
}
368
391
break;
369
case 'o':
392
case 'o': /* --options-for */
370
393
if (arg != NULL){
371
394
char *p_name = strsep(&arg, ":");
372
395
if(p_name[0] == '\0'){
382
405
if(p[0] == '\0'){
383
406
continue;
384
407
}
385
if(not add_argument(getplugin(p_name, plugins), p)){
408
if(not add_argument(getplugin(p_name), p)){
386
409
perror("add_argument");
387
410
return ARGP_ERR_UNKNOWN;
388
411
}
390
413
}
391
414
}
392
415
break;
393
case 'f':
416
case 'f': /* --envs-for */
394
417
if(arg == NULL){
395
418
break;
396
419
}
404
427
break;
405
428
}
406
429
envdef++;
407
if(not add_environment(getplugin(p_name, plugins), envdef)){
430
if(not add_environment(getplugin(p_name), envdef)){
408
431
perror("add_environment");
409
432
}
410
433
}
411
434
break;
412
case 'd':
435
case 'd': /* --disable */
413
436
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
437
plugin *p = getplugin(arg);
415
438
if(p == NULL){
416
439
return ARGP_ERR_UNKNOWN;
417
440
}
418
441
p->disabled = true;
419
442
}
420
443
break;
421
case 128:
444
case 128: /* --plugin-dir */
422
445
plugindir = strdup(arg);
423
446
if(plugindir == NULL){
424
447
perror("strdup");
425
448
}
426
449
break;
427
case 129:
450
case 129: /* --config-file */
428
451
argfile = strdup(arg);
429
452
if(argfile == NULL){
430
453
perror("strdup");
431
454
}
432
455
break;
433
case 130:
456
case 130: /* --userid */
434
457
uid = (uid_t)strtol(arg, NULL, 10);
435
458
break;
436
case 131:
459
case 131: /* --groupid */
437
460
gid = (gid_t)strtol(arg, NULL, 10);
438
461
break;
439
case 132:
462
case 132: /* --debug */
440
463
debug = true;
441
464
break;
442
465
case ARGP_KEY_ARG:
450
473
return 0;
451
474
}
452
475
453
plugin *plugin_list = NULL;
454
455
476
struct argp argp = { .options = options, .parser = parse_opt,
456
477
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
457
478
.doc = "Mandos plugin runner -- Run plugins" };
458
479
459
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
480
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
460
481
if (ret == ARGP_ERR_UNKNOWN){
461
482
fprintf(stderr, "Unknown error while parsing arguments\n");
462
483
exitstatus = EXIT_FAILURE;
463
484
goto fallback;
464
485
}
465
486
487
/* Opens the configfile if aviable */
466
488
if (argfile == NULL){
467
489
conffp = fopen(AFILE, "r");
468
490
} else {
469
491
conffp = fopen(argfile, "r");
470
}
471
492
}
472
493
if(conffp != NULL){
473
494
char *org_line = NULL;
474
495
char *p, *arg, *new_arg, *line;
486
507
}
487
508
custom_argv[0] = argv[0];
488
509
custom_argv[1] = NULL;
489
510
511
/* for each line in the config file, strip whitespace and ignore
512
commented text */
490
513
while(true){
491
514
sret = getline(&org_line, &size, conffp);
492
515
if(sret == -1){
530
553
goto fallback;
531
554
}
532
555
}
533
556
/* If there was any arguments from configuration file,
557
pass them to parser as command arguments */
534
558
if(custom_argv != NULL){
535
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
559
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, NULL);
536
560
if (ret == ARGP_ERR_UNKNOWN){
537
561
fprintf(stderr, "Unknown error while parsing arguments\n");
538
562
exitstatus = EXIT_FAILURE;
553
577
}
554
578
}
555
579
}
556
580
581
/* Strip permissions down to nobody */
557
582
ret = setuid(uid);
558
583
if (ret == -1){
559
584
perror("setuid");
560
}
561
585
}
562
586
setgid(gid);
563
587
if (ret == -1){
564
588
perror("setgid");
590
614
}
591
615
592
616
FD_ZERO(&rfds_all);
593
617
618
/* Read and execute any executable in the plugin directory*/
594
619
while(true){
595
620
dirst = readdir(dir);
596
621
627
652
break;
628
653
}
629
654
}
630
631
655
if(bad_name){
632
656
continue;
633
657
}
634
635
658
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
636
659
size_t suf_len = strlen(*suf);
637
660
if((d_name_len >= suf_len)
664
687
free(filename);
665
688
continue;
666
689
}
667
690
691
/* Ignore non-executable files */
668
692
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
669
693
if(debug){
670
694
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
673
697
free(filename);
674
698
continue;
675
699
}
676
plugin *p = getplugin(dirst->d_name, &plugin_list);
700
701
plugin *p = getplugin(dirst->d_name);
677
702
if(p == NULL){
678
703
perror("getplugin");
679
704
free(filename);
689
714
}
690
715
{
691
716
/* Add global arguments to argument list for this plugin */
692
plugin *g = getplugin(NULL, &plugin_list);
717
plugin *g = getplugin(NULL);
693
718
if(g != NULL){
694
719
for(char **a = g->argv + 1; *a != NULL; a++){
695
720
if(not add_argument(p, *a)){
727
752
exitstatus = EXIT_FAILURE;
728
753
goto fallback;
729
754
}
755
/* Ask OS to automatic close the pipe on exec */
730
756
ret = set_cloexec_flag(pipefd[0]);
731
757
if(ret < 0){
732
758
perror("set_cloexec_flag");
790
816
}
791
817
/* no return */
792
818
}
793
/* parent process */
819
/* Parent process */
820
close(pipefd[1]); /* Close unused write end of pipe */
794
821
free(filename);
795
close(pipefd[1]); /* close unused write end of pipe */
796
process *new_process = malloc(sizeof(process));
797
if (new_process == NULL){
798
perror("malloc");
822
plugin *new_plugin = getplugin(dirst->d_name);
823
if (new_plugin == NULL){
824
perror("getplugin");
799
825
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
800
826
if(ret < 0){
801
perror("sigprocmask");
827
perror("sigprocmask");
802
828
}
803
829
exitstatus = EXIT_FAILURE;
804
830
goto fallback;
805
831
}
806
832
807
*new_process = (struct process){ .pid = pid,
808
.fd = pipefd[0],
809
.next = process_list };
810
// List handling
811
process_list = new_process;
833
new_plugin->pid = pid;
834
new_plugin->fd = pipefd[0];
835
812
836
/* Unblock SIGCHLD so signal handler can be run if this process
813
837
has already completed */
814
838
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
818
842
goto fallback;
819
843
}
820
844
821
FD_SET(new_process->fd, &rfds_all);
845
FD_SET(new_plugin->fd, &rfds_all);
822
846
823
if (maxfd < new_process->fd){
824
maxfd = new_process->fd;
847
if (maxfd < new_plugin->fd){
848
maxfd = new_plugin->fd;
825
849
}
826
850
827
851
}
828
829
free_plugin_list(plugin_list);
830
plugin_list = NULL;
831
852
832
853
closedir(dir);
833
854
dir = NULL;
834
835
if (process_list == NULL){
836
fprintf(stderr, "No plugin processes started. Incorrect plugin"
837
" directory?\n");
838
process_list = NULL;
855
856
for(plugin *p = plugin_list; p != NULL; p = p->next){
857
if(p->pid != 0){
858
break;
859
}
860
if(p->next == NULL){
861
fprintf(stderr, "No plugin processes started. Incorrect plugin"
862
" directory?\n");
863
free_plugin_list();
864
}
839
865
}
840
while(process_list){
866
867
/* Main loop while running plugins exist */
868
while(plugin_list){
841
869
fd_set rfds = rfds_all;
842
870
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
843
871
if (select_ret == -1){
847
875
}
848
876
/* OK, now either a process completed, or something can be read
849
877
from one of them */
850
for(process *proc = process_list; proc ; proc = proc->next){
878
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
851
879
/* Is this process completely done? */
852
880
if(proc->eof and proc->completed){
853
881
/* Only accept the plugin output if it exited cleanly */
854
882
if(not WIFEXITED(proc->status)
855
883
or WEXITSTATUS(proc->status) != 0){
856
884
/* Bad exit by plugin */
885
857
886
if(debug){
858
887
if(WIFEXITED(proc->status)){
859
888
fprintf(stderr, "Plugin %u exited with status %d\n",
868
897
(unsigned int) (proc->pid));
869
898
}
870
899
}
900
871
901
/* Remove the plugin */
872
902
FD_CLR(proc->fd, &rfds_all);
903
873
904
/* Block signal while modifying process_list */
874
905
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
875
906
if(ret < 0){
877
908
exitstatus = EXIT_FAILURE;
878
909
goto fallback;
879
910
}
880
/* Delete this process entry from the list */
881
if(process_list == proc){
882
/* First one - simple */
883
process_list = proc->next;
884
} else {
885
/* Second one or later */
886
for(process *p = process_list; p != NULL; p = p->next){
887
if(p->next == proc){
888
p->next = proc->next;
889
break;
890
}
891
}
892
}
911
free_plugin(proc);
893
912
/* We are done modifying process list, so unblock signal */
894
913
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
895
914
NULL);
896
915
if(ret < 0){
897
916
perror("sigprocmask");
898
}
899
free(proc->buffer);
900
free(proc);
901
/* We deleted this process from the list, so we can't go
902
proc->next. Therefore, start over from the beginning of
903
the process list */
904
break;
917
exitstatus = EXIT_FAILURE;
918
goto fallback;
919
}
920
921
if(plugin_list == NULL){
922
break;
923
}
924
continue;
905
925
}
926
906
927
/* This process exited nicely, so print its buffer */
907
928
908
929
bool bret = print_out_password(proc->buffer,
913
934
}
914
935
goto fallback;
915
936
}
937
916
938
/* This process has not completed. Does it have any output? */
917
939
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
918
940
/* This process had nothing to say at this time */
948
970
949
971
fallback:
950
972
951
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
973
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
952
974
/* Fallback if all plugins failed, none are found or an error
953
975
occured */
954
976
bool bret;
974
996
}
975
997
free(custom_argv);
976
998
}
977
free_plugin_list(plugin_list);
978
999
979
1000
if(dir != NULL){
980
1001
closedir(dir);
981
1002
}
982
1003
983
1004
/* Free the process list and kill the processes */
984
for(process *next; process_list != NULL; process_list = next){
985
next = process_list->next;
986
close(process_list->fd);
987
ret = kill(process_list->pid, SIGTERM);
988
if(ret == -1 and errno != ESRCH){
989
/* set-uid proccesses migth not get closed */
990
perror("kill");
1005
for(plugin *p = plugin_list; p != NULL; p = p->next){
1006
if(p->pid != 0){
1007
close(p->fd);
1008
ret = kill(p->pid, SIGTERM);
1009
if(ret == -1 and errno != ESRCH){
1010
/* Set-uid proccesses might not get closed */
1011
perror("kill");
1012
}
991
1013
}
992
free(process_list->buffer);
993
free(process_list);
994
1014
}
995
1015
996
1016
/* Wait for any remaining child processes to terminate */
1001
1021
perror("wait");
1002
1022
}
1003
1023
1024
free_plugin_list();
1025
1004
1026
free(plugindir);
1005
1027
free(argfile);
1006
1028
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Version: 2.0.2.dev0