197
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
200
process *process_list = NULL;
202
/* Mark a process as completed when it exits, and save its exit
223
/* Mark processes as completed when they exit, and save their exit
204
225
void handle_sigchld(__attribute__((unused)) int sig){
205
process *proc = process_list;
207
pid_t pid = wait(&status);
212
while(proc != NULL and proc->pid != pid){
216
/* Process not found in process list */
219
proc->status = status;
220
proc->completed = true;
227
plugin *proc = plugin_list;
229
pid_t pid = waitpid(-1, &status, WNOHANG);
231
/* Only still running child processes */
235
if (errno != ECHILD){
238
/* No child processes */
242
/* A child exited, find it in process_list */
243
while(proc != NULL and proc->pid != pid){
247
/* Process not found in process list */
250
proc->status = status;
251
proc->completed = true;
255
/* Prints out a password to stdout */
223
256
bool print_out_password(const char *buffer, size_t length){
225
if(length>0 and buffer[length-1] == '\n'){
228
258
for(size_t written = 0; written < length; written += (size_t)ret){
229
259
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
230
260
length - written));
238
char **add_to_argv(char **argv, int *argc, char *arg){
241
argv = malloc(sizeof(char*) * 2);
268
/* Removes and free a plugin from the plugin list */
269
static void free_plugin(plugin *plugin_node){
271
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
274
free(plugin_node->argv);
275
for(char **env = plugin_node->environ; *env != NULL; env++){
278
free(plugin_node->environ);
279
free(plugin_node->buffer);
281
/* Removes the plugin from the singly-linked list */
282
if(plugin_node == plugin_list){
283
/* First one - simple */
284
plugin_list = plugin_list->next;
286
/* Second one or later */
287
for(plugin *p = plugin_list; p != NULL; p = p->next){
288
if(p->next == plugin_node){
289
p->next = plugin_node->next;
245
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
249
argv = realloc(argv, sizeof(char *)
250
* ((unsigned int) *argc + 1));
259
static void free_plugin_list(plugin *plugin_list){
260
for(plugin *next; plugin_list != NULL; plugin_list = next){
261
next = plugin_list->next;
262
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
265
free(plugin_list->argv);
266
for(char **env = plugin_list->environ; *env != NULL; env++){
269
free(plugin_list->environ);
298
static void free_plugin_list(void){
299
while(plugin_list != NULL){
300
free_plugin(plugin_list);
274
304
int main(int argc, char *argv[]){
275
const char *plugindir = "/lib/mandos/plugins.d";
276
const char *argfile = ARGFILE;
305
char *plugindir = NULL;
306
char *argfile = NULL;
278
308
size_t d_name_len;
311
341
{ .name = "global-options", .key = 'g',
312
342
.arg = "OPTION[,OPTION[,...]]",
313
343
.doc = "Options passed to all plugins" },
314
{ .name = "global-envs", .key = 'e',
344
{ .name = "global-env", .key = 'G',
315
345
.arg = "VAR=value",
316
346
.doc = "Environment variable passed to all plugins" },
317
347
{ .name = "options-for", .key = 'o',
318
348
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
319
349
.doc = "Options passed only to specified plugin" },
320
{ .name = "envs-for", .key = 'f',
350
{ .name = "env-for", .key = 'E',
321
351
.arg = "PLUGIN:ENV=value",
322
352
.doc = "Environment variable passed to specified plugin" },
323
353
{ .name = "disable", .key = 'd',
325
355
.doc = "Disable a specific plugin", .group = 1 },
356
{ .name = "enable", .key = 'e',
358
.doc = "Enable a specific plugin", .group = 1 },
326
359
{ .name = "plugin-dir", .key = 128,
327
360
.arg = "DIRECTORY",
328
361
.doc = "Specify a different plugin directory", .group = 2 },
329
{ .name = "userid", .key = 129,
330
.arg = "ID", .flags = 0,
331
.doc = "User ID the plugins will run as", .group = 2 },
332
{ .name = "groupid", .key = 130,
333
.arg = "ID", .flags = 0,
334
.doc = "Group ID the plugins will run as", .group = 2 },
335
{ .name = "debug", .key = 131,
336
.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 },
340
error_t parse_opt (int key, char *arg, struct argp_state *state) {
341
/* Get the INPUT argument from `argp_parse', which we know is a
342
pointer to our plugin list pointer. */
343
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 */
346
380
if (arg != NULL){
348
382
while((p = strsep(&arg, ",")) != NULL){
349
383
if(p[0] == '\0'){
352
if(not add_argument(getplugin(NULL, plugins), p)){
386
if(not add_argument(getplugin(NULL), p)){
353
387
perror("add_argument");
354
388
return ARGP_ERR_UNKNOWN;
393
case 'G': /* --global-env */
364
char *envdef = strdup(arg);
368
if(not add_environment(getplugin(NULL, plugins), envdef)){
369
perror("add_environment");
397
if(not add_environment(getplugin(NULL), arg, true)){
398
perror("add_environment");
401
case 'o': /* --options-for */
374
402
if (arg != NULL){
375
403
char *p_name = strsep(&arg, ":");
376
if(p_name[0] == '\0'){
404
if(p_name[0] == '\0' or arg == NULL){
379
407
char *opt = strsep(&arg, ":");
408
if(opt[0] == '\0' or opt == NULL){
385
while((p = strsep(&opt, ",")) != NULL){
389
if(not add_argument(getplugin(p_name, plugins), p)){
390
perror("add_argument");
391
return ARGP_ERR_UNKNOWN;
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 */
403
429
if(envdef == NULL){
406
char *p_name = strndup(arg, (size_t) (envdef-arg));
411
if(not add_environment(getplugin(p_name, plugins), envdef)){
433
if(not add_environment(getplugin(arg), envdef+1, true)){
412
434
perror("add_environment");
438
case 'd': /* --disable */
417
439
if (arg != NULL){
418
plugin *p = getplugin(arg, plugins);
440
plugin *p = getplugin(arg);
420
442
return ARGP_ERR_UNKNOWN;
422
444
p->disabled = true;
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 */
429
467
uid = (uid_t)strtol(arg, NULL, 10);
469
case 131: /* --groupid */
432
470
gid = (gid_t)strtol(arg, NULL, 10);
472
case 132: /* --debug */
437
475
case ARGP_KEY_ARG:
438
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
443
return ARGP_ERR_UNKNOWN;
448
plugin *plugin_list = NULL;
450
struct argp argp = { .options = options, .parser = parse_opt,
451
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
476
/* Cryptsetup always passes an argument, which is an empty
477
string if "none" was specified in /etc/crypttab. So if
478
argument was empty, we ignore it silently. */
480
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
486
return ARGP_ERR_UNKNOWN;
491
/* This option parser is the same as parse_opt() above, except it
492
ignores everything but the --config-file option. */
493
error_t parse_opt_config_file (int key, char *arg,
494
__attribute__((unused))
495
struct argp_state *state) {
497
case 'g': /* --global-options */
498
case 'G': /* --global-env */
499
case 'o': /* --options-for */
500
case 'E': /* --env-for */
501
case 'd': /* --disable */
502
case 'e': /* --enable */
503
case 128: /* --plugin-dir */
505
case 129: /* --config-file */
507
argfile = strdup(arg);
512
case 130: /* --userid */
513
case 131: /* --groupid */
514
case 132: /* --debug */
519
return ARGP_ERR_UNKNOWN;
524
struct argp argp = { .options = options,
525
.parser = parse_opt_config_file,
452
527
.doc = "Mandos plugin runner -- Run plugins" };
454
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
529
/* Parse using the parse_opt_config_file in order to get the custom
530
config file location, if any. */
531
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
455
532
if (ret == ARGP_ERR_UNKNOWN){
456
533
fprintf(stderr, "Unknown error while parsing arguments\n");
457
534
exitstatus = EXIT_FAILURE;
461
conffp = fopen(argfile, "r");
538
/* Reset to the normal argument parser */
539
argp.parser = parse_opt;
541
/* Open the configfile if available */
542
if (argfile == NULL){
543
conffp = fopen(AFILE, "r");
545
conffp = fopen(argfile, "r");
462
547
if(conffp != NULL){
463
548
char *org_line = NULL;
464
549
char *p, *arg, *new_arg, *line;
832
960
(unsigned int) (proc->pid));
835
964
/* Remove the plugin */
836
965
FD_CLR(proc->fd, &rfds_all);
837
967
/* Block signal while modifying process_list */
838
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
968
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
840
970
perror("sigprocmask");
841
971
exitstatus = EXIT_FAILURE;
844
/* Delete this process entry from the list */
845
if(process_list == proc){
846
/* First one - simple */
847
process_list = proc->next;
849
/* Second one or later */
850
for(process *p = process_list; p != NULL; p = p->next){
852
p->next = proc->next;
857
975
/* We are done modifying process list, so unblock signal */
858
976
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
861
979
perror("sigprocmask");
865
/* We deleted this process from the list, so we can't go
866
proc->next. Therefore, start over from the beginning of
980
exitstatus = EXIT_FAILURE;
984
if(plugin_list == NULL){
988
plugin *next_plugin = proc->next;
870
994
/* This process exited nicely, so print its buffer */
872
bool bret = print_out_password(proc->buffer, proc->buffer_length);
996
bool bret = print_out_password(proc->buffer,
997
proc->buffer_length);
874
999
perror("print_out_password");
875
1000
exitstatus = EXIT_FAILURE;
879
1005
/* This process has not completed. Does it have any output? */
880
1006
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
881
1007
/* This process had nothing to say at this time */
884
1011
/* Before reading, make the process' data buffer large enough */
914
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
915
/* Fallback if all plugins failed, none are found or an error occured */
1042
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1043
/* Fallback if all plugins failed, none are found or an error
917
1046
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
918
1047
char *passwordbuffer = getpass("Password: ");
919
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1048
size_t len = strlen(passwordbuffer);
1049
/* Strip trailing newline */
1050
if(len > 0 and passwordbuffer[len-1] == '\n'){
1051
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1054
bret = print_out_password(passwordbuffer, len);
921
1056
perror("print_out_password");
922
1057
exitstatus = EXIT_FAILURE;
933
1068
if(custom_argv != NULL){
934
for(char **arg = custom_argv; *arg != NULL; arg++){
1069
for(char **arg = custom_argv+1; *arg != NULL; arg++){
937
1072
free(custom_argv);
939
free_plugin_list(plugin_list);
941
1075
if(dir != NULL){
945
1079
/* Free the process list and kill the processes */
946
for(process *next; process_list != NULL; process_list = next){
947
next = process_list->next;
948
close(process_list->fd);
949
ret = kill(process_list->pid, SIGTERM);
950
if(ret == -1 and errno != ESRCH){
951
/* set-uid proccesses migth not get closed */
1080
for(plugin *p = plugin_list; p != NULL; p = p->next){
1083
ret = kill(p->pid, SIGTERM);
1084
if(ret == -1 and errno != ESRCH){
1085
/* Set-uid proccesses might not get closed */
954
free(process_list->buffer);
958
1091
/* Wait for any remaining child processes to terminate */