102
109
/* Create a new plugin */
103
110
plugin *new_plugin = malloc(sizeof(plugin));
104
111
if (new_plugin == NULL){
108
new_plugin->name = name;
114
char *copy_name = NULL;
116
copy_name = strdup(name);
117
if(copy_name == NULL){
122
*new_plugin = (plugin) { .name = copy_name,
125
.next = plugin_list };
109
127
new_plugin->argv = malloc(sizeof(char *) * 2);
110
128
if (new_plugin->argv == NULL){
114
new_plugin->argv[0] = name;
133
new_plugin->argv[0] = copy_name;
115
134
new_plugin->argv[1] = NULL;
116
new_plugin->argc = 1;
117
new_plugin->disabled = false;
118
new_plugin->next = *plugin_list;
136
new_plugin->environ = malloc(sizeof(char *));
137
if(new_plugin->environ == NULL){
139
free(new_plugin->argv);
143
new_plugin->environ[0] = NULL;
119
145
/* Append the new plugin to the list */
120
*plugin_list = new_plugin;
146
plugin_list = new_plugin;
121
147
return new_plugin;
124
static void addargument(plugin *p, char *arg){
125
p->argv[p->argc] = arg;
126
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
127
if (p->argv == NULL){
132
p->argv[p->argc] = NULL;
150
/* Helper function for add_argument and add_environment */
151
static bool add_to_char_array(const char *new, char ***array,
153
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
160
/* Make a copy of the new string */
161
char *copy = strdup(new);
165
/* Insert the copy */
166
(*array)[*len] = copy;
168
/* Add a new terminating NULL pointer to the last element */
169
(*array)[*len] = NULL;
173
/* Add to a plugin's argument vector */
174
static bool add_argument(plugin *p, const char *arg){
178
return add_to_char_array(arg, &(p->argv), &(p->argc));
181
/* Add to a plugin's environment */
182
static bool add_environment(plugin *p, const char *def, bool replace){
186
/* namelen = length of name of environment variable */
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen + 1) == 0){
191
/* It already exists */
193
char *new = realloc(*e, strlen(def) + 1);
203
return add_to_char_array(def, &(p->environ), &(p->envc));
246
341
{ .name = "global-options", .key = 'g',
247
342
.arg = "OPTION[,OPTION[,...]]",
248
343
.doc = "Options passed to all plugins" },
344
{ .name = "global-env", .key = 'G',
346
.doc = "Environment variable passed to all plugins" },
249
347
{ .name = "options-for", .key = 'o',
250
348
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
251
349
.doc = "Options passed only to specified plugin" },
350
{ .name = "env-for", .key = 'E',
351
.arg = "PLUGIN:ENV=value",
352
.doc = "Environment variable passed to specified plugin" },
252
353
{ .name = "disable", .key = 'd',
254
355
.doc = "Disable a specific plugin", .group = 1 },
356
{ .name = "enable", .key = 'e',
358
.doc = "Enable a specific plugin", .group = 1 },
255
359
{ .name = "plugin-dir", .key = 128,
256
360
.arg = "DIRECTORY",
257
361
.doc = "Specify a different plugin directory", .group = 2 },
258
{ .name = "userid", .key = 129,
259
.arg = "ID", .flags = 0,
260
.doc = "User ID the plugins will run as", .group = 2 },
261
{ .name = "groupid", .key = 130,
262
.arg = "ID", .flags = 0,
263
.doc = "Group ID the plugins will run as", .group = 2 },
264
{ .name = "debug", .key = 131,
265
.doc = "Debug mode", .group = 3 },
362
{ .name = "config-file", .key = 129,
364
.doc = "Specify a different configuration file", .group = 2 },
365
{ .name = "userid", .key = 130,
366
.arg = "ID", .flags = 0,
367
.doc = "User ID the plugins will run as", .group = 3 },
368
{ .name = "groupid", .key = 131,
369
.arg = "ID", .flags = 0,
370
.doc = "Group ID the plugins will run as", .group = 3 },
371
{ .name = "debug", .key = 132,
372
.doc = "Debug mode", .group = 4 },
269
error_t parse_opt (int key, char *arg, struct argp_state *state) {
270
/* Get the INPUT argument from `argp_parse', which we know is a
271
pointer to our plugin list pointer. */
272
plugin **plugins = state->input;
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
379
case 'g': /* --global-options */
275
380
if (arg != NULL){
277
382
while((p = strsep(&arg, ",")) != NULL){
278
383
if(p[0] == '\0'){
281
addargument(getplugin(NULL, plugins), p);
386
if(not add_argument(getplugin(NULL), p)){
387
perror("add_argument");
388
return ARGP_ERR_UNKNOWN;
393
case 'G': /* --global-env */
397
if(not add_environment(getplugin(NULL), arg, true)){
398
perror("add_environment");
401
case 'o': /* --options-for */
286
402
if (arg != NULL){
287
char *name = strsep(&arg, ":");
403
char *p_name = strsep(&arg, ":");
404
if(p_name[0] == '\0' or arg == NULL){
291
407
char *opt = strsep(&arg, ":");
297
while((p = strsep(&opt, ",")) != NULL){
301
addargument(getplugin(name, plugins), p);
308
getplugin(arg, plugins)->disabled = true;
408
if(opt[0] == '\0' or opt == NULL){
412
while((p = strsep(&opt, ",")) != NULL){
416
if(not add_argument(getplugin(p_name), p)){
417
perror("add_argument");
418
return ARGP_ERR_UNKNOWN;
423
case 'E': /* --env-for */
428
char *envdef = strchr(arg, ':');
433
if(not add_environment(getplugin(arg), envdef+1, true)){
434
perror("add_environment");
438
case 'd': /* --disable */
440
plugin *p = getplugin(arg);
442
return ARGP_ERR_UNKNOWN;
447
case 'e': /* --enable */
449
plugin *p = getplugin(arg);
451
return ARGP_ERR_UNKNOWN;
456
case 128: /* --plugin-dir */
458
plugindir = strdup(arg);
459
if(plugindir == NULL){
463
case 129: /* --config-file */
464
/* This is already done by parse_opt_config_file() */
466
case 130: /* --userid */
315
467
uid = (uid_t)strtol(arg, NULL, 10);
469
case 131: /* --groupid */
318
470
gid = (gid_t)strtol(arg, NULL, 10);
472
case 132: /* --debug */
323
475
case ARGP_KEY_ARG:
324
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
329
return ARGP_ERR_UNKNOWN;
334
plugin *plugin_list = NULL;
336
struct argp argp = { .options = options, .parser = parse_opt,
337
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
476
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
481
return ARGP_ERR_UNKNOWN;
486
/* This option parser is the same as parse_opt() above, except it
487
ignores everything but the --config-file option. */
488
error_t parse_opt_config_file (int key, char *arg,
489
__attribute__((unused))
490
struct argp_state *state) {
492
case 'g': /* --global-options */
493
case 'G': /* --global-env */
494
case 'o': /* --options-for */
495
case 'E': /* --env-for */
496
case 'd': /* --disable */
497
case 'e': /* --enable */
498
case 128: /* --plugin-dir */
500
case 129: /* --config-file */
502
argfile = strdup(arg);
507
case 130: /* --userid */
508
case 131: /* --groupid */
509
case 132: /* --debug */
514
return ARGP_ERR_UNKNOWN;
519
struct argp argp = { .options = options,
520
.parser = parse_opt_config_file,
338
522
.doc = "Mandos plugin runner -- Run plugins" };
340
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
524
/* Parse using the parse_opt_config_file in order to get the custom
525
config file location, if any. */
526
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
341
527
if (ret == ARGP_ERR_UNKNOWN){
342
528
fprintf(stderr, "Unknown error while parsing arguments\n");
343
529
exitstatus = EXIT_FAILURE;
347
conffp = fopen(conffile, "r");
533
/* Reset to the normal argument parser */
534
argp.parser = parse_opt;
536
/* Open the configfile if available */
537
if (argfile == NULL){
538
conffp = fopen(AFILE, "r");
540
conffp = fopen(argfile, "r");
348
542
if(conffp != NULL){
349
543
char *org_line = NULL;
544
char *p, *arg, *new_arg, *line;
352
char *p, *arg, *new_arg, *line;
353
547
const char whitespace_delims[] = " \r\t\f\v\n";
354
548
const char comment_delim[] = "#";
551
custom_argv = malloc(sizeof(char*) * 2);
552
if(custom_argv == NULL){
554
exitstatus = EXIT_FAILURE;
557
custom_argv[0] = argv[0];
558
custom_argv[1] = NULL;
560
/* for each line in the config file, strip whitespace and ignore
357
563
sret = getline(&org_line, &size, conffp);
368
574
new_arg = strdup(p);
369
custom_argv = addcustomargument(custom_argv, &custom_argc, new_arg);
370
if (custom_argv == NULL){
371
perror("addcustomargument");
372
exitstatus = EXIT_FAILURE;
577
exitstatus = EXIT_FAILURE;
583
custom_argv = realloc(custom_argv, sizeof(char *)
584
* ((unsigned int) custom_argc + 1));
585
if(custom_argv == NULL){
587
exitstatus = EXIT_FAILURE;
591
custom_argv[custom_argc-1] = new_arg;
592
custom_argv[custom_argc] = NULL;
379
/* check for harmfull errors */
597
/* Check for harmful errors and go to fallback. Other errors might
598
not affect opening plugins */
380
599
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
382
601
exitstatus = EXIT_FAILURE;
605
/* If there was any arguments from configuration file,
606
pass them to parser as command arguments */
387
607
if(custom_argv != NULL){
388
custom_argv[0] = argv[0];
389
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
608
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
390
610
if (ret == ARGP_ERR_UNKNOWN){
391
611
fprintf(stderr, "Unknown error while parsing arguments\n");
392
612
exitstatus = EXIT_FAILURE;
617
/* Parse actual command line arguments, to let them override the
619
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
620
if (ret == ARGP_ERR_UNKNOWN){
621
fprintf(stderr, "Unknown error while parsing arguments\n");
622
exitstatus = EXIT_FAILURE;
398
627
for(plugin *p = plugin_list; p != NULL; p=p->next){
399
628
fprintf(stderr, "Plugin: %s has %d arguments\n",
531
plugin *p = getplugin(dirst->d_name, &plugin_list);
533
779
/* Add global arguments to argument list for this plugin */
534
plugin *g = getplugin(NULL, &plugin_list);
535
for(char **a = g->argv + 1; *a != NULL; a++){
780
plugin *g = getplugin(NULL);
782
for(char **a = g->argv + 1; *a != NULL; a++){
783
if(not add_argument(p, *a)){
784
perror("add_argument");
787
/* Add global environment variables */
788
for(char **e = g->environ; *e != NULL; e++){
789
if(not add_environment(p, *e, false)){
790
perror("add_environment");
795
/* If this plugin has any environment variables, we will call
796
using execve and need to duplicate the environment from this
798
if(p->environ[0] != NULL){
799
for(char **e = environ; *e != NULL; e++){
800
if(not add_environment(p, *e, false)){
801
perror("add_environment");
540
807
ret = pipe(pipefd);
543
810
exitstatus = EXIT_FAILURE;
813
/* Ask OS to automatic close the pipe on exec */
546
814
ret = set_cloexec_flag(pipefd[0]);
548
816
perror("set_cloexec_flag");
549
817
exitstatus = EXIT_FAILURE;
552
820
ret = set_cloexec_flag(pipefd[1]);
554
822
perror("set_cloexec_flag");
555
823
exitstatus = EXIT_FAILURE;
558
826
/* Block SIGCHLD until process is safely in process list */
559
827
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
561
829
perror("sigprocmask");
562
830
exitstatus = EXIT_FAILURE;
565
// Starting a new process to be watched
833
/* Starting a new process to be watched */
566
834
pid_t pid = fork();
569
837
exitstatus = EXIT_FAILURE;
573
841
/* this is the child process */
593
861
above and must now close it manually here. */
596
if(execv(filename, p->argv) < 0){
864
if(p->environ[0] == NULL){
865
if(execv(filename, p->argv) < 0){
870
if(execve(filename, p->argv, p->environ) < 0){
878
close(pipefd[1]); /* Close unused write end of pipe */
604
close(pipefd[1]); /* close unused write end of pipe */
605
process *new_process = malloc(sizeof(process));
606
if (new_process == NULL){
880
plugin *new_plugin = getplugin(dirst->d_name);
881
if (new_plugin == NULL){
608
883
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
610
perror("sigprocmask");
885
perror("sigprocmask");
612
887
exitstatus = EXIT_FAILURE;
616
*new_process = (struct process){ .pid = pid,
618
.next = process_list };
620
process_list = new_process;
891
new_plugin->pid = pid;
892
new_plugin->fd = pipefd[0];
621
894
/* Unblock SIGCHLD so signal handler can be run if this process
622
895
has already completed */
623
896
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
625
898
perror("sigprocmask");
626
899
exitstatus = EXIT_FAILURE;
630
FD_SET(new_process->fd, &rfds_all);
632
if (maxfd < new_process->fd){
633
maxfd = new_process->fd;
638
/* Free the plugin list */
639
for(plugin *next; plugin_list != NULL; plugin_list = next){
640
next = plugin_list->next;
641
free(plugin_list->argv);
903
FD_SET(new_plugin->fd, &rfds_all);
905
if (maxfd < new_plugin->fd){
906
maxfd = new_plugin->fd;
648
if (process_list == NULL){
649
fprintf(stderr, "No plugin processes started. Incorrect plugin"
914
for(plugin *p = plugin_list; p != NULL; p = p->next){
919
fprintf(stderr, "No plugin processes started. Incorrect plugin"
925
/* Main loop while running plugins exist */
654
927
fd_set rfds = rfds_all;
655
928
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
656
929
if (select_ret == -1){
657
930
perror("select");
658
931
exitstatus = EXIT_FAILURE;
661
934
/* OK, now either a process completed, or something can be read
662
935
from one of them */
663
for(process *proc = process_list; proc ; proc = proc->next){
936
for(plugin *proc = plugin_list; proc != NULL;){
664
937
/* Is this process completely done? */
665
938
if(proc->eof and proc->completed){
666
939
/* Only accept the plugin output if it exited cleanly */
667
940
if(not WIFEXITED(proc->status)
668
941
or WEXITSTATUS(proc->status) != 0){
669
942
/* Bad exit by plugin */
671
945
if(WIFEXITED(proc->status)){
672
946
fprintf(stderr, "Plugin %u exited with status %d\n",
681
955
(unsigned int) (proc->pid));
684
959
/* Remove the plugin */
685
960
FD_CLR(proc->fd, &rfds_all);
686
962
/* Block signal while modifying process_list */
687
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
963
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
689
965
perror("sigprocmask");
690
966
exitstatus = EXIT_FAILURE;
693
/* Delete this process entry from the list */
694
if(process_list == proc){
695
/* First one - simple */
696
process_list = proc->next;
698
/* Second one or later */
699
for(process *p = process_list; p != NULL; p = p->next){
701
p->next = proc->next;
706
970
/* We are done modifying process list, so unblock signal */
707
971
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
710
974
perror("sigprocmask");
714
/* We deleted this process from the list, so we can't go
715
proc->next. Therefore, start over from the beginning of
975
exitstatus = EXIT_FAILURE;
979
if(plugin_list == NULL){
983
plugin *next_plugin = proc->next;
719
989
/* This process exited nicely, so print its buffer */
721
bool bret = print_out_password(proc->buffer, proc->buffer_length);
991
bool bret = print_out_password(proc->buffer,
992
proc->buffer_length);
723
994
perror("print_out_password");
724
995
exitstatus = EXIT_FAILURE;
728
1000
/* This process has not completed. Does it have any output? */
729
1001
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
730
1002
/* This process had nothing to say at this time */
733
1006
/* Before reading, make the process' data buffer large enough */