175
179
/* Add to a plugin's environment */
176
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);
180
201
return add_to_char_array(def, &(p->environ), &(p->envc));
185
205
* Based on the example in the GNU LibC manual chapter 13.13 "File
186
206
* Descriptor Flags".
187
207
* *Note File Descriptor Flags:(libc)Descriptor Flags.
189
static int set_cloexec_flag(int fd)
209
static int set_cloexec_flag(int fd){
191
210
int ret = fcntl(fd, F_GETFD, 0);
192
211
/* If reading the flags failed, return error indication now. */
246
char **add_to_argv(char **argv, int *argc, char *arg){
249
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;
253
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
257
argv = realloc(argv, sizeof(char *)
258
* ((unsigned int) *argc + 1));
267
static void free_plugin_list(plugin *plugin_list){
268
for(plugin *next; plugin_list != NULL; plugin_list = next){
269
next = plugin_list->next;
270
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
273
free(plugin_list->argv);
274
for(char **env = plugin_list->environ; *env != NULL; env++){
277
free(plugin_list->environ);
295
static void free_plugin_list(void){
296
while(plugin_list != NULL){
297
free_plugin(plugin_list);
282
301
int main(int argc, char *argv[]){
283
const char *plugindir = "/lib/mandos/plugins.d";
284
const char *argfile = ARGFILE;
302
char *plugindir = NULL;
303
char *argfile = NULL;
286
305
size_t d_name_len;
319
338
{ .name = "global-options", .key = 'g',
320
339
.arg = "OPTION[,OPTION[,...]]",
321
340
.doc = "Options passed to all plugins" },
322
{ .name = "global-envs", .key = 'e',
341
{ .name = "global-env", .key = 'G',
323
342
.arg = "VAR=value",
324
343
.doc = "Environment variable passed to all plugins" },
325
344
{ .name = "options-for", .key = 'o',
326
345
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
327
346
.doc = "Options passed only to specified plugin" },
328
{ .name = "envs-for", .key = 'f',
347
{ .name = "env-for", .key = 'E',
329
348
.arg = "PLUGIN:ENV=value",
330
349
.doc = "Environment variable passed to specified plugin" },
331
350
{ .name = "disable", .key = 'd',
333
352
.doc = "Disable a specific plugin", .group = 1 },
353
{ .name = "enable", .key = 'e',
355
.doc = "Enable a specific plugin", .group = 1 },
334
356
{ .name = "plugin-dir", .key = 128,
335
357
.arg = "DIRECTORY",
336
358
.doc = "Specify a different plugin directory", .group = 2 },
337
{ .name = "userid", .key = 129,
338
.arg = "ID", .flags = 0,
339
.doc = "User ID the plugins will run as", .group = 2 },
340
{ .name = "groupid", .key = 130,
341
.arg = "ID", .flags = 0,
342
.doc = "Group ID the plugins will run as", .group = 2 },
343
{ .name = "debug", .key = 131,
344
.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 },
348
error_t parse_opt (int key, char *arg, struct argp_state *state) {
349
/* Get the INPUT argument from `argp_parse', which we know is a
350
pointer to our plugin list pointer. */
351
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 */
354
377
if (arg != NULL){
356
379
while((p = strsep(&arg, ",")) != NULL){
357
380
if(p[0] == '\0'){
360
if(not add_argument(getplugin(NULL, plugins), p)){
383
if(not add_argument(getplugin(NULL), p)){
361
384
perror("add_argument");
362
385
return ARGP_ERR_UNKNOWN;
390
case 'G': /* --global-env */
372
char *envdef = strdup(arg);
376
if(not add_environment(getplugin(NULL, plugins), envdef)){
377
perror("add_environment");
394
if(not add_environment(getplugin(NULL), arg, true)){
395
perror("add_environment");
398
case 'o': /* --options-for */
382
399
if (arg != NULL){
383
400
char *p_name = strsep(&arg, ":");
384
if(p_name[0] == '\0'){
401
if(p_name[0] == '\0' or arg == NULL){
387
404
char *opt = strsep(&arg, ":");
405
if(opt[0] == '\0' or opt == NULL){
393
while((p = strsep(&opt, ",")) != NULL){
397
if(not add_argument(getplugin(p_name, plugins), p)){
398
perror("add_argument");
399
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 */
411
426
if(envdef == NULL){
414
char *p_name = strndup(arg, (size_t) (envdef-arg));
419
if(not add_environment(getplugin(p_name, plugins), envdef)){
430
if(not add_environment(getplugin(arg), envdef+1, true)){
420
431
perror("add_environment");
435
case 'd': /* --disable */
425
436
if (arg != NULL){
426
plugin *p = getplugin(arg, plugins);
437
plugin *p = getplugin(arg);
428
439
return ARGP_ERR_UNKNOWN;
430
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 */
437
464
uid = (uid_t)strtol(arg, NULL, 10);
466
case 131: /* --groupid */
440
467
gid = (gid_t)strtol(arg, NULL, 10);
469
case 132: /* --debug */
445
472
case ARGP_KEY_ARG:
446
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
451
return ARGP_ERR_UNKNOWN;
456
plugin *plugin_list = NULL;
458
struct argp argp = { .options = options, .parser = parse_opt,
459
.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,
460
524
.doc = "Mandos plugin runner -- Run plugins" };
462
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);
463
529
if (ret == ARGP_ERR_UNKNOWN){
464
530
fprintf(stderr, "Unknown error while parsing arguments\n");
465
531
exitstatus = EXIT_FAILURE;
469
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");
470
544
if(conffp != NULL){
471
545
char *org_line = NULL;
472
546
char *p, *arg, *new_arg, *line;
840
957
(unsigned int) (proc->pid));
843
961
/* Remove the plugin */
844
962
FD_CLR(proc->fd, &rfds_all);
845
964
/* Block signal while modifying process_list */
846
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
965
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
848
967
perror("sigprocmask");
849
968
exitstatus = EXIT_FAILURE;
852
/* Delete this process entry from the list */
853
if(process_list == proc){
854
/* First one - simple */
855
process_list = proc->next;
857
/* Second one or later */
858
for(process *p = process_list; p != NULL; p = p->next){
860
p->next = proc->next;
865
972
/* We are done modifying process list, so unblock signal */
866
973
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
869
976
perror("sigprocmask");
873
/* We deleted this process from the list, so we can't go
874
proc->next. Therefore, start over from the beginning of
977
exitstatus = EXIT_FAILURE;
981
if(plugin_list == NULL){
985
plugin *next_plugin = proc->next;
878
991
/* This process exited nicely, so print its buffer */
880
bool bret = print_out_password(proc->buffer, proc->buffer_length);
993
bool bret = print_out_password(proc->buffer,
994
proc->buffer_length);
882
996
perror("print_out_password");
883
997
exitstatus = EXIT_FAILURE;
887
1002
/* This process has not completed. Does it have any output? */
888
1003
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
889
1004
/* This process had nothing to say at this time */
892
1008
/* Before reading, make the process' data buffer large enough */
922
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
923
/* 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
925
1043
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
926
1044
char *passwordbuffer = getpass("Password: ");
927
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);
929
1053
perror("print_out_password");
930
1054
exitstatus = EXIT_FAILURE;
941
1065
if(custom_argv != NULL){
942
for(char **arg = custom_argv; *arg != NULL; arg++){
1066
for(char **arg = custom_argv+1; *arg != NULL; arg++){
945
1069
free(custom_argv);
947
free_plugin_list(plugin_list);
949
1072
if(dir != NULL){
953
1076
/* Free the process list and kill the processes */
954
for(process *next; process_list != NULL; process_list = next){
955
next = process_list->next;
956
close(process_list->fd);
957
ret = kill(process_list->pid, SIGTERM);
958
if(ret == -1 and errno != ESRCH){
959
/* 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 */
962
free(process_list->buffer);
966
1088
/* Wait for any remaining child processes to terminate */