101
107
/* Create a new plugin */
102
108
plugin *new_plugin = malloc(sizeof(plugin));
103
109
if (new_plugin == NULL){
107
new_plugin->name = name;
112
char *copy_name = NULL;
114
copy_name = strdup(name);
115
if(copy_name == NULL){
120
*new_plugin = (plugin) { .name = copy_name,
123
.next = plugin_list };
108
125
new_plugin->argv = malloc(sizeof(char *) * 2);
109
126
if (new_plugin->argv == NULL){
113
new_plugin->argv[0] = name;
131
new_plugin->argv[0] = copy_name;
114
132
new_plugin->argv[1] = NULL;
115
new_plugin->argc = 1;
116
new_plugin->disabled = false;
117
new_plugin->next = *plugin_list;
134
new_plugin->environ = malloc(sizeof(char *));
135
if(new_plugin->environ == NULL){
137
free(new_plugin->argv);
141
new_plugin->environ[0] = NULL;
118
143
/* Append the new plugin to the list */
119
*plugin_list = new_plugin;
144
plugin_list = new_plugin;
120
145
return new_plugin;
123
static void addargument(plugin *p, char *arg){
124
p->argv[p->argc] = arg;
125
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
126
if (p->argv == NULL){
131
p->argv[p->argc] = NULL;
148
/* Helper function for add_argument and add_environment */
149
static bool add_to_char_array(const char *new, char ***array,
151
/* Resize the pointed-to array to hold one more pointer */
152
*array = realloc(*array, sizeof(char *)
153
* (size_t) ((*len) + 2));
158
/* Make a copy of the new string */
159
char *copy = strdup(new);
163
/* Insert the copy */
164
(*array)[*len] = copy;
166
/* Add a new terminating NULL pointer to the last element */
167
(*array)[*len] = NULL;
171
/* Add to a plugin's argument vector */
172
static bool add_argument(plugin *p, const char *arg){
176
return add_to_char_array(arg, &(p->argv), &(p->argc));
179
/* Add to a plugin's environment */
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);
201
return add_to_char_array(def, &(p->environ), &(p->envc));
147
216
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
150
process *process_list = NULL;
152
/* Mark a process as completed when it exits, and save its exit
220
/* Mark processes as completed when they exit, and save their exit
154
void handle_sigchld(__attribute__((unused)) int sig){
155
process *proc = process_list;
157
pid_t pid = wait(&status);
162
while(proc != NULL and proc->pid != pid){
166
/* Process not found in process list */
169
proc->status = status;
170
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;
252
/* Prints out a password to stdout */
253
static bool print_out_password(const char *buffer, size_t length){
255
for(size_t written = 0; written < length; written += (size_t)ret){
256
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
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;
295
static void free_plugin_list(void){
296
while(plugin_list != NULL){
297
free_plugin(plugin_list);
173
301
int main(int argc, char *argv[]){
174
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
302
char *plugindir = NULL;
303
char *argfile = NULL;
175
305
size_t d_name_len;
177
307
struct dirent *dirst;
206
338
{ .name = "global-options", .key = 'g',
207
339
.arg = "OPTION[,OPTION[,...]]",
208
340
.doc = "Options passed to all plugins" },
341
{ .name = "global-env", .key = 'G',
343
.doc = "Environment variable passed to all plugins" },
209
344
{ .name = "options-for", .key = 'o',
210
345
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
211
346
.doc = "Options passed only to specified plugin" },
347
{ .name = "env-for", .key = 'E',
348
.arg = "PLUGIN:ENV=value",
349
.doc = "Environment variable passed to specified plugin" },
212
350
{ .name = "disable", .key = 'd',
214
352
.doc = "Disable a specific plugin", .group = 1 },
353
{ .name = "enable", .key = 'e',
355
.doc = "Enable a specific plugin", .group = 1 },
215
356
{ .name = "plugin-dir", .key = 128,
216
357
.arg = "DIRECTORY",
217
358
.doc = "Specify a different plugin directory", .group = 2 },
218
{ .name = "userid", .key = 129,
219
.arg = "ID", .flags = 0,
220
.doc = "User ID the plugins will run as", .group = 2 },
221
{ .name = "groupid", .key = 130,
222
.arg = "ID", .flags = 0,
223
.doc = "Group ID the plugins will run as", .group = 2 },
224
{ .name = "debug", .key = 131,
225
.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 },
229
error_t parse_opt (int key, char *arg, struct argp_state *state) {
230
/* Get the INPUT argument from `argp_parse', which we know is a
231
pointer to our plugin list pointer. */
232
plugin **plugins = state->input;
373
error_t parse_opt (int key, char *arg, __attribute__((unused))
374
struct argp_state *state) {
236
char *p = strtok(arg, ",");
238
addargument(getplugin(NULL, plugins), p);
239
p = strtok(NULL, ",");
245
char *name = strtok(arg, ":");
246
char *p = strtok(NULL, ":");
250
addargument(getplugin(name, plugins), p);
251
p = strtok(NULL, ",");
258
getplugin(arg, plugins)->disabled = true;
376
case 'g': /* --global-options */
379
while((p = strsep(&arg, ",")) != NULL){
383
if(not add_argument(getplugin(NULL), p)){
384
perror("add_argument");
385
return ARGP_ERR_UNKNOWN;
390
case 'G': /* --global-env */
394
if(not add_environment(getplugin(NULL), arg, true)){
395
perror("add_environment");
398
case 'o': /* --options-for */
400
char *p_name = strsep(&arg, ":");
401
if(p_name[0] == '\0' or arg == NULL){
404
char *opt = strsep(&arg, ":");
405
if(opt[0] == '\0' or opt == NULL){
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 */
425
char *envdef = strchr(arg, ':');
430
if(not add_environment(getplugin(arg), envdef+1, true)){
431
perror("add_environment");
435
case 'd': /* --disable */
437
plugin *p = getplugin(arg);
439
return ARGP_ERR_UNKNOWN;
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 */
265
464
uid = (uid_t)strtol(arg, NULL, 10);
466
case 131: /* --groupid */
268
467
gid = (gid_t)strtol(arg, NULL, 10);
469
case 132: /* --debug */
273
472
case ARGP_KEY_ARG:
274
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
282
return ARGP_ERR_UNKNOWN;
287
plugin *plugin_list = NULL;
289
struct argp argp = { .options = options, .parser = parse_opt,
290
.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,
291
524
.doc = "Mandos plugin runner -- Run plugins" };
293
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);
294
529
if (ret == ARGP_ERR_UNKNOWN){
295
fprintf(stderr, "Unkown error while parsing arguments\n");
530
fprintf(stderr, "Unknown error while parsing arguments\n");
296
531
exitstatus = EXIT_FAILURE;
301
/* This is a mangled argument in the form of
302
"+--option+--other-option=parameter+--yet-another-option", etc */
303
/* Make new argc and argv vars, and call argp_parse() again. */
304
plus_options++; /* skip the first '+' character */
305
const char delims[] = "+";
308
plus_argv = malloc(sizeof(char*) * 2);
309
if(plus_argv == NULL){
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");
545
char *org_line = NULL;
546
char *p, *arg, *new_arg, *line;
549
const char whitespace_delims[] = " \r\t\f\v\n";
550
const char comment_delim[] = "#";
553
custom_argv = malloc(sizeof(char*) * 2);
554
if(custom_argv == NULL){
310
555
perror("malloc");
311
556
exitstatus = EXIT_FAILURE;
314
plus_argv[0] = argv[0];
316
arg = strtok(plus_options, delims); /* Get first argument */
319
plus_argv = realloc(plus_argv, sizeof(char *)
320
* ((unsigned int) new_argc + 1));
321
if(plus_argv == NULL){
323
exitstatus = EXIT_FAILURE;
326
plus_argv[new_argc-1] = arg;
327
plus_argv[new_argc] = NULL;
328
arg = strtok(NULL, delims); /* Get next argument */
330
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
559
custom_argv[0] = argv[0];
560
custom_argv[1] = NULL;
562
/* for each line in the config file, strip whitespace and ignore
565
sret = getline(&org_line, &size, conffp);
571
arg = strsep(&line, comment_delim);
572
while((p = strsep(&arg, whitespace_delims)) != NULL){
579
exitstatus = EXIT_FAILURE;
585
custom_argv = realloc(custom_argv, sizeof(char *)
586
* ((unsigned int) custom_argc + 1));
587
if(custom_argv == NULL){
589
exitstatus = EXIT_FAILURE;
593
custom_argv[custom_argc-1] = new_arg;
594
custom_argv[custom_argc] = NULL;
599
/* Check for harmful errors and go to fallback. Other errors might
600
not affect opening plugins */
601
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
603
exitstatus = EXIT_FAILURE;
607
/* If there was any arguments from configuration file,
608
pass them to parser as command arguments */
609
if(custom_argv != NULL){
610
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
331
612
if (ret == ARGP_ERR_UNKNOWN){
332
fprintf(stderr, "Unkown error while parsing arguments\n");
613
fprintf(stderr, "Unknown error while parsing arguments\n");
333
614
exitstatus = EXIT_FAILURE;
619
/* Parse actual command line arguments, to let them override the
621
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
622
if (ret == ARGP_ERR_UNKNOWN){
623
fprintf(stderr, "Unknown error while parsing arguments\n");
624
exitstatus = EXIT_FAILURE;
339
629
for(plugin *p = plugin_list; p != NULL; p=p->next){
340
630
fprintf(stderr, "Plugin: %s has %d arguments\n",
530
863
above and must now close it manually here. */
533
if(execv(filename, p->argv) < 0){
866
if(p->environ[0] == NULL){
867
if(execv(filename, p->argv) < 0){
872
if(execve(filename, p->argv, p->environ) < 0){
880
close(pipefd[1]); /* Close unused write end of pipe */
541
close(pipefd[1]); /* close unused write end of pipe */
542
process *new_process = malloc(sizeof(process));
543
if (new_process == NULL){
882
plugin *new_plugin = getplugin(dirst->d_name);
883
if (new_plugin == NULL){
545
885
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
547
perror("sigprocmask");
887
perror("sigprocmask");
549
889
exitstatus = EXIT_FAILURE;
553
*new_process = (struct process){ .pid = pid,
555
.next = process_list };
557
process_list = new_process;
893
new_plugin->pid = pid;
894
new_plugin->fd = pipefd[0];
558
896
/* Unblock SIGCHLD so signal handler can be run if this process
559
897
has already completed */
560
898
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
562
900
perror("sigprocmask");
563
901
exitstatus = EXIT_FAILURE;
567
FD_SET(new_process->fd, &rfds_all);
569
if (maxfd < new_process->fd){
570
maxfd = new_process->fd;
575
/* Free the plugin list */
576
for(plugin *next; plugin_list != NULL; plugin_list = next){
577
next = plugin_list->next;
578
free(plugin_list->argv);
905
FD_SET(new_plugin->fd, &rfds_all);
907
if (maxfd < new_plugin->fd){
908
maxfd = new_plugin->fd;
585
if (process_list == NULL){
586
fprintf(stderr, "No plugin processes started, exiting\n");
587
exitstatus = EXIT_FAILURE;
916
for(plugin *p = plugin_list; p != NULL; p = p->next){
921
fprintf(stderr, "No plugin processes started. Incorrect plugin"
927
/* Main loop while running plugins exist */
591
929
fd_set rfds = rfds_all;
592
930
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
593
931
if (select_ret == -1){
594
932
perror("select");
595
933
exitstatus = EXIT_FAILURE;
598
936
/* OK, now either a process completed, or something can be read
599
937
from one of them */
600
for(process *proc = process_list; proc ; proc = proc->next){
938
for(plugin *proc = plugin_list; proc != NULL;){
601
939
/* Is this process completely done? */
602
940
if(proc->eof and proc->completed){
603
941
/* Only accept the plugin output if it exited cleanly */
604
942
if(not WIFEXITED(proc->status)
605
943
or WEXITSTATUS(proc->status) != 0){
606
944
/* Bad exit by plugin */
608
947
if(WIFEXITED(proc->status)){
609
948
fprintf(stderr, "Plugin %u exited with status %d\n",