170
179
/* Add to a plugin's environment */
171
static bool add_environment(plugin *p, const char *def){
180
static bool add_environment(plugin *p, const char *def, bool replace){
184
/* namelen = length of name of environment variable */
185
size_t namelen = (size_t)(strchrnul(def, '=') - def);
186
/* Search for this environment variable */
187
for(char **e = p->environ; *e != NULL; e++){
188
if(strncmp(*e, def, namelen + 1) == 0){
189
/* It already exists */
191
char *new = realloc(*e, strlen(def) + 1);
175
201
return add_to_char_array(def, &(p->environ), &(p->envc));
180
205
* Based on the example in the GNU LibC manual chapter 13.13 "File
181
206
* Descriptor Flags".
182
207
* *Note File Descriptor Flags:(libc)Descriptor Flags.
184
static int set_cloexec_flag(int fd)
209
static int set_cloexec_flag(int fd){
186
210
int ret = fcntl(fd, F_GETFD, 0);
187
211
/* If reading the flags failed, return error indication now. */
192
216
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
195
process *process_list = NULL;
197
/* Mark a process as completed when it exits, and save its exit
220
/* Mark processes as completed when they exit, and save their exit
199
void handle_sigchld(__attribute__((unused)) int sig){
200
process *proc = process_list;
202
pid_t pid = wait(&status);
207
while(proc != NULL and proc->pid != pid){
211
/* Process not found in process list */
214
proc->status = status;
215
proc->completed = true;
222
static void handle_sigchld(__attribute__((unused)) int sig){
224
plugin *proc = plugin_list;
226
pid_t pid = waitpid(-1, &status, WNOHANG);
228
/* Only still running child processes */
232
if (errno != ECHILD){
235
/* No child processes */
239
/* A child exited, find it in process_list */
240
while(proc != NULL and proc->pid != pid){
244
/* Process not found in process list */
247
proc->status = status;
248
proc->completed = true;
218
bool print_out_password(const char *buffer, size_t length){
252
/* Prints out a password to stdout */
253
static bool print_out_password(const char *buffer, size_t length){
220
if(length>0 and buffer[length-1] == '\n'){
223
255
for(size_t written = 0; written < length; written += (size_t)ret){
224
256
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
225
257
length - written));
233
char **add_to_argv(char **argv, int *argc, char *arg){
236
argv = malloc(sizeof(char*) * 2);
265
/* Removes and free a plugin from the plugin list */
266
static void free_plugin(plugin *plugin_node){
268
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
271
free(plugin_node->argv);
272
for(char **env = plugin_node->environ; *env != NULL; env++){
275
free(plugin_node->environ);
276
free(plugin_node->buffer);
278
/* Removes the plugin from the singly-linked list */
279
if(plugin_node == plugin_list){
280
/* First one - simple */
281
plugin_list = plugin_list->next;
283
/* Second one or later */
284
for(plugin *p = plugin_list; p != NULL; p = p->next){
285
if(p->next == plugin_node){
286
p->next = plugin_node->next;
240
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
244
argv = realloc(argv, sizeof(char *)
245
* ((unsigned int) *argc + 1));
254
static void free_plugin_list(plugin *plugin_list){
255
for(plugin *next = plugin_list; plugin_list != NULL; plugin_list = next){
256
next = plugin_list->next;
257
free(plugin_list->name);
258
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
261
free(plugin_list->argv);
262
for(char **env = plugin_list->environ; *env != NULL; env++){
265
free(plugin_list->environ);
295
static void free_plugin_list(void){
296
while(plugin_list != NULL){
297
free_plugin(plugin_list);
270
301
int main(int argc, char *argv[]){
271
const char *plugindir = "/lib/mandos/plugins.d";
272
const char *argfile = ARGFILE;
302
char *plugindir = NULL;
303
char *argfile = NULL;
274
305
size_t d_name_len;
307
338
{ .name = "global-options", .key = 'g',
308
339
.arg = "OPTION[,OPTION[,...]]",
309
340
.doc = "Options passed to all plugins" },
310
{ .name = "global-envs", .key = 'e',
341
{ .name = "global-env", .key = 'G',
311
342
.arg = "VAR=value",
312
343
.doc = "Environment variable passed to all plugins" },
313
344
{ .name = "options-for", .key = 'o',
314
345
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
315
346
.doc = "Options passed only to specified plugin" },
316
{ .name = "envs-for", .key = 'f',
347
{ .name = "env-for", .key = 'E',
317
348
.arg = "PLUGIN:ENV=value",
318
349
.doc = "Environment variable passed to specified plugin" },
319
350
{ .name = "disable", .key = 'd',
321
352
.doc = "Disable a specific plugin", .group = 1 },
353
{ .name = "enable", .key = 'e',
355
.doc = "Enable a specific plugin", .group = 1 },
322
356
{ .name = "plugin-dir", .key = 128,
323
357
.arg = "DIRECTORY",
324
358
.doc = "Specify a different plugin directory", .group = 2 },
325
{ .name = "userid", .key = 129,
326
.arg = "ID", .flags = 0,
327
.doc = "User ID the plugins will run as", .group = 2 },
328
{ .name = "groupid", .key = 130,
329
.arg = "ID", .flags = 0,
330
.doc = "Group ID the plugins will run as", .group = 2 },
331
{ .name = "debug", .key = 131,
332
.doc = "Debug mode", .group = 3 },
359
{ .name = "config-file", .key = 129,
361
.doc = "Specify a different configuration file", .group = 2 },
362
{ .name = "userid", .key = 130,
363
.arg = "ID", .flags = 0,
364
.doc = "User ID the plugins will run as", .group = 3 },
365
{ .name = "groupid", .key = 131,
366
.arg = "ID", .flags = 0,
367
.doc = "Group ID the plugins will run as", .group = 3 },
368
{ .name = "debug", .key = 132,
369
.doc = "Debug mode", .group = 4 },
336
error_t parse_opt (int key, char *arg, struct argp_state *state) {
337
/* Get the INPUT argument from `argp_parse', which we know is a
338
pointer to our plugin list pointer. */
339
plugin **plugins = state->input;
373
error_t parse_opt (int key, char *arg, __attribute__((unused))
374
struct argp_state *state) {
376
case 'g': /* --global-options */
342
377
if (arg != NULL){
344
379
while((p = strsep(&arg, ",")) != NULL){
345
380
if(p[0] == '\0'){
348
if(not add_argument(getplugin(NULL, plugins), p)){
383
if(not add_argument(getplugin(NULL), p)){
349
384
perror("add_argument");
350
385
return ARGP_ERR_UNKNOWN;
390
case 'G': /* --global-env */
360
char *envdef = strdup(arg);
364
if(not add_environment(getplugin(NULL, plugins), envdef)){
365
perror("add_environment");
394
if(not add_environment(getplugin(NULL), arg, true)){
395
perror("add_environment");
398
case 'o': /* --options-for */
370
399
if (arg != NULL){
371
400
char *p_name = strsep(&arg, ":");
372
if(p_name[0] == '\0'){
401
if(p_name[0] == '\0' or arg == NULL){
375
404
char *opt = strsep(&arg, ":");
405
if(opt[0] == '\0' or opt == NULL){
381
while((p = strsep(&opt, ",")) != NULL){
385
if(not add_argument(getplugin(p_name, plugins), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
409
while((p = strsep(&opt, ",")) != NULL){
413
if(not add_argument(getplugin(p_name), p)){
414
perror("add_argument");
415
return ARGP_ERR_UNKNOWN;
420
case 'E': /* --env-for */
399
426
if(envdef == NULL){
402
char *p_name = strndup(arg, (size_t) (envdef-arg));
407
if(not add_environment(getplugin(p_name, plugins), envdef)){
430
if(not add_environment(getplugin(arg), envdef+1, true)){
408
431
perror("add_environment");
435
case 'd': /* --disable */
413
436
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
437
plugin *p = getplugin(arg);
416
439
return ARGP_ERR_UNKNOWN;
418
441
p->disabled = true;
444
case 'e': /* --enable */
446
plugin *p = getplugin(arg);
448
return ARGP_ERR_UNKNOWN;
453
case 128: /* --plugin-dir */
455
plugindir = strdup(arg);
456
if(plugindir == NULL){
460
case 129: /* --config-file */
461
/* This is already done by parse_opt_config_file() */
463
case 130: /* --userid */
425
464
uid = (uid_t)strtol(arg, NULL, 10);
466
case 131: /* --groupid */
428
467
gid = (gid_t)strtol(arg, NULL, 10);
469
case 132: /* --debug */
433
472
case ARGP_KEY_ARG:
434
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
439
return ARGP_ERR_UNKNOWN;
444
plugin *plugin_list = NULL;
446
struct argp argp = { .options = options, .parser = parse_opt,
447
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
473
/* Cryptsetup always passes an argument, which is an empty
474
string if "none" was specified in /etc/crypttab. So if
475
argument was empty, we ignore it silently. */
477
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
483
return ARGP_ERR_UNKNOWN;
488
/* This option parser is the same as parse_opt() above, except it
489
ignores everything but the --config-file option. */
490
error_t parse_opt_config_file (int key, char *arg,
491
__attribute__((unused))
492
struct argp_state *state) {
494
case 'g': /* --global-options */
495
case 'G': /* --global-env */
496
case 'o': /* --options-for */
497
case 'E': /* --env-for */
498
case 'd': /* --disable */
499
case 'e': /* --enable */
500
case 128: /* --plugin-dir */
502
case 129: /* --config-file */
504
argfile = strdup(arg);
509
case 130: /* --userid */
510
case 131: /* --groupid */
511
case 132: /* --debug */
516
return ARGP_ERR_UNKNOWN;
521
struct argp argp = { .options = options,
522
.parser = parse_opt_config_file,
448
524
.doc = "Mandos plugin runner -- Run plugins" };
450
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
526
/* Parse using the parse_opt_config_file in order to get the custom
527
config file location, if any. */
528
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
451
529
if (ret == ARGP_ERR_UNKNOWN){
452
530
fprintf(stderr, "Unknown error while parsing arguments\n");
453
531
exitstatus = EXIT_FAILURE;
457
conffp = fopen(argfile, "r");
535
/* Reset to the normal argument parser */
536
argp.parser = parse_opt;
538
/* Open the configfile if available */
539
if (argfile == NULL){
540
conffp = fopen(AFILE, "r");
542
conffp = fopen(argfile, "r");
458
544
if(conffp != NULL){
459
545
char *org_line = NULL;
460
546
char *p, *arg, *new_arg, *line;
827
957
(unsigned int) (proc->pid));
830
961
/* Remove the plugin */
831
962
FD_CLR(proc->fd, &rfds_all);
832
964
/* Block signal while modifying process_list */
833
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
965
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
835
967
perror("sigprocmask");
836
968
exitstatus = EXIT_FAILURE;
839
/* Delete this process entry from the list */
840
if(process_list == proc){
841
/* First one - simple */
842
process_list = proc->next;
844
/* Second one or later */
845
for(process *p = process_list; p != NULL; p = p->next){
847
p->next = proc->next;
852
972
/* We are done modifying process list, so unblock signal */
853
973
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
856
976
perror("sigprocmask");
860
/* We deleted this process from the list, so we can't go
861
proc->next. Therefore, start over from the beginning of
977
exitstatus = EXIT_FAILURE;
981
if(plugin_list == NULL){
985
plugin *next_plugin = proc->next;
865
991
/* This process exited nicely, so print its buffer */
867
bool bret = print_out_password(proc->buffer, proc->buffer_length);
993
bool bret = print_out_password(proc->buffer,
994
proc->buffer_length);
869
996
perror("print_out_password");
870
997
exitstatus = EXIT_FAILURE;
874
1002
/* This process has not completed. Does it have any output? */
875
1003
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
876
1004
/* This process had nothing to say at this time */
879
1008
/* Before reading, make the process' data buffer large enough */
909
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
910
/* Fallback if all plugins failed, none are found or an error occured */
1039
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1040
/* Fallback if all plugins failed, none are found or an error
912
1043
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
913
1044
char *passwordbuffer = getpass("Password: ");
914
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1045
size_t len = strlen(passwordbuffer);
1046
/* Strip trailing newline */
1047
if(len > 0 and passwordbuffer[len-1] == '\n'){
1048
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1051
bret = print_out_password(passwordbuffer, len);
916
1053
perror("print_out_password");
917
1054
exitstatus = EXIT_FAILURE;
928
1065
if(custom_argv != NULL){
929
for(char **arg = custom_argv; *arg != NULL; arg++){
1066
for(char **arg = custom_argv+1; *arg != NULL; arg++){
932
1069
free(custom_argv);
934
free_plugin_list(plugin_list);
936
1072
if(dir != NULL){
940
1076
/* Free the process list and kill the processes */
941
for(process *next; process_list != NULL; process_list = next){
942
next = process_list->next;
943
close(process_list->fd);
944
ret = kill(process_list->pid, SIGTERM);
945
if(ret == -1 and errno != ESRCH){
946
/* set-uid proccesses migth not get closed */
1077
for(plugin *p = plugin_list; p != NULL; p = p->next){
1080
ret = kill(p->pid, SIGTERM);
1081
if(ret == -1 and errno != ESRCH){
1082
/* Set-uid proccesses might not get closed */
949
free(process_list->buffer);
953
1088
/* Wait for any remaining child processes to terminate */