27
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
29
EXIT_SUCCESS, realloc() */
29
30
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
32
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
34
stat, waitpid(), WIFEXITED(),
34
35
WEXITSTATUS(), wait(), pid_t,
85
/* Variables used for running processes*/
92
volatile sig_atomic_t completed;
94
94
struct plugin *next;
97
static plugin *getplugin(char *name, plugin **plugin_list){
98
for (plugin *p = *plugin_list; p != NULL; p = p->next){
100
or (p->name and name and (strcmp(p->name, name) == 0))){
97
static plugin *plugin_list = NULL;
99
/* Gets an existing plugin based on name,
100
or if none is found, creates a new one */
101
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
103
for(plugin *p = plugin_list; p != NULL; p = p->next){
105
or (p->name and name and (strcmp(p->name, name) == 0))){
104
109
/* Create a new plugin */
105
110
plugin *new_plugin = malloc(sizeof(plugin));
106
if (new_plugin == NULL){
111
if(new_plugin == NULL){
109
114
char *copy_name = NULL;
110
115
if(name != NULL){
111
116
copy_name = strdup(name);
112
117
if(copy_name == NULL){
117
*new_plugin = (plugin) { .name = copy_name,
121
.next = *plugin_list };
123
*new_plugin = (plugin){ .name = copy_name,
126
.next = plugin_list };
123
128
new_plugin->argv = malloc(sizeof(char *) * 2);
124
if (new_plugin->argv == NULL){
129
if(new_plugin->argv == NULL){
126
131
free(new_plugin);
129
134
new_plugin->argv[0] = copy_name;
130
135
new_plugin->argv[1] = NULL;
132
137
new_plugin->environ = malloc(sizeof(char *));
133
138
if(new_plugin->environ == NULL){
176
182
/* Add to a plugin's environment */
177
static bool add_environment(plugin *p, const char *def){
183
static bool add_environment(plugin *p, const char *def, bool replace){
187
/* namelen = length of name of environment variable */
188
size_t namelen = (size_t)(strchrnul(def, '=') - def);
189
/* Search for this environment variable */
190
for(char **e = p->environ; *e != NULL; e++){
191
if(strncmp(*e, def, namelen + 1) == 0){
192
/* It already exists */
194
char *new = realloc(*e, strlen(def) + 1);
181
204
return add_to_char_array(def, &(p->environ), &(p->envc));
186
208
* Based on the example in the GNU LibC manual chapter 13.13 "File
187
209
* Descriptor Flags".
188
210
* *Note File Descriptor Flags:(libc)Descriptor Flags.
190
static int set_cloexec_flag(int fd)
212
static int set_cloexec_flag(int fd){
192
213
int ret = fcntl(fd, F_GETFD, 0);
193
214
/* If reading the flags failed, return error indication now. */
250
char **add_to_argv(char **argv, int *argc, char *arg){
253
argv = malloc(sizeof(char*) * 2);
270
/* Removes and free a plugin from the plugin list */
271
static void free_plugin(plugin *plugin_node){
273
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
276
free(plugin_node->argv);
277
for(char **env = plugin_node->environ; *env != NULL; env++){
280
free(plugin_node->environ);
281
free(plugin_node->buffer);
283
/* Removes the plugin from the singly-linked list */
284
if(plugin_node == plugin_list){
285
/* First one - simple */
286
plugin_list = plugin_list->next;
288
/* Second one or later */
289
for(plugin *p = plugin_list; p != NULL; p = p->next){
290
if(p->next == plugin_node){
291
p->next = plugin_node->next;
257
argv[0] = NULL; /* Will be set to argv[0] in main before
262
argv = realloc(argv, sizeof(char *)
263
* ((unsigned int) *argc + 1));
272
static void free_plugin_list(plugin *plugin_list){
273
for(plugin *next; plugin_list != NULL; plugin_list = next){
274
next = plugin_list->next;
275
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
278
free(plugin_list->argv);
279
for(char **env = plugin_list->environ; *env != NULL; env++){
282
free(plugin_list->environ);
300
static void free_plugin_list(void){
301
while(plugin_list != NULL){
302
free_plugin(plugin_list);
287
306
int main(int argc, char *argv[]){
288
const char *plugindir = "/lib/mandos/plugins.d";
289
const char *argfile = ARGFILE;
307
char *plugindir = NULL;
308
char *argfile = NULL;
291
310
size_t d_name_len;
293
312
struct dirent *dirst;
315
int ret, numchars, maxfd = 0;
297
318
uid_t uid = 65534;
298
319
gid_t gid = 65534;
299
320
bool debug = false;
324
345
{ .name = "global-options", .key = 'g',
325
346
.arg = "OPTION[,OPTION[,...]]",
326
347
.doc = "Options passed to all plugins" },
327
{ .name = "global-envs", .key = 'e',
348
{ .name = "global-env", .key = 'G',
328
349
.arg = "VAR=value",
329
350
.doc = "Environment variable passed to all plugins" },
330
351
{ .name = "options-for", .key = 'o',
331
352
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
332
353
.doc = "Options passed only to specified plugin" },
333
{ .name = "envs-for", .key = 'f',
354
{ .name = "env-for", .key = 'E',
334
355
.arg = "PLUGIN:ENV=value",
335
356
.doc = "Environment variable passed to specified plugin" },
336
357
{ .name = "disable", .key = 'd',
338
359
.doc = "Disable a specific plugin", .group = 1 },
360
{ .name = "enable", .key = 'e',
362
.doc = "Enable a specific plugin", .group = 1 },
339
363
{ .name = "plugin-dir", .key = 128,
340
364
.arg = "DIRECTORY",
341
365
.doc = "Specify a different plugin directory", .group = 2 },
342
{ .name = "userid", .key = 129,
343
.arg = "ID", .flags = 0,
344
.doc = "User ID the plugins will run as", .group = 2 },
345
{ .name = "groupid", .key = 130,
346
.arg = "ID", .flags = 0,
347
.doc = "Group ID the plugins will run as", .group = 2 },
348
{ .name = "debug", .key = 131,
349
.doc = "Debug mode", .group = 3 },
366
{ .name = "config-file", .key = 129,
368
.doc = "Specify a different configuration file", .group = 2 },
369
{ .name = "userid", .key = 130,
370
.arg = "ID", .flags = 0,
371
.doc = "User ID the plugins will run as", .group = 3 },
372
{ .name = "groupid", .key = 131,
373
.arg = "ID", .flags = 0,
374
.doc = "Group ID the plugins will run as", .group = 3 },
375
{ .name = "debug", .key = 132,
376
.doc = "Debug mode", .group = 4 },
353
error_t parse_opt (int key, char *arg, struct argp_state *state) {
354
/* Get the INPUT argument from `argp_parse', which we know is a
355
pointer to our plugin list pointer. */
356
plugin **plugins = state->input;
361
while((p = strsep(&arg, ",")) != NULL){
380
error_t parse_opt(int key, char *arg, __attribute__((unused))
381
struct argp_state *state){
383
case 'g': /* --global-options */
386
while((plugin_option = strsep(&arg, ",")) != NULL){
387
if(plugin_option[0] == '\0'){
365
if(not add_argument(getplugin(NULL, plugins), p)){
390
if(not add_argument(getplugin(NULL), plugin_option)){
366
391
perror("add_argument");
367
392
return ARGP_ERR_UNKNOWN;
397
case 'G': /* --global-env */
377
char *envdef = strdup(arg);
381
if(not add_environment(getplugin(NULL, plugins), envdef)){
382
perror("add_environment");
401
if(not add_environment(getplugin(NULL), arg, true)){
402
perror("add_environment");
388
char *p_name = strsep(&arg, ":");
389
if(p_name[0] == '\0'){
392
char *opt = strsep(&arg, ":");
398
while((p = strsep(&opt, ",")) != NULL){
402
if(not add_argument(getplugin(p_name, plugins), p)){
403
perror("add_argument");
404
return ARGP_ERR_UNKNOWN;
405
case 'o': /* --options-for */
407
char *plugin_name = strsep(&arg, ":");
408
if(plugin_name[0] == '\0'){
412
while((plugin_option = strsep(&arg, ",")) != NULL){
413
if(not add_argument(getplugin(plugin_name), plugin_option)){
414
perror("add_argument");
415
return ARGP_ERR_UNKNOWN;
420
case 'E': /* --env-for */
416
426
if(envdef == NULL){
419
char *p_name = strndup(arg, (size_t) (envdef-arg));
424
if(not add_environment(getplugin(p_name, plugins), envdef)){
430
if(not add_environment(getplugin(arg), envdef+1, true)){
425
431
perror("add_environment");
431
plugin *p = getplugin(arg, plugins);
435
case 'd': /* --disable */
437
plugin *p = getplugin(arg);
433
439
return ARGP_ERR_UNKNOWN;
435
441
p->disabled = true;
442
uid = (uid_t)strtol(arg, NULL, 10);
445
gid = (gid_t)strtol(arg, NULL, 10);
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 */
464
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
465
if(ret < 1 or tmpmax != (uid_t)tmpmax
466
or arg[numchars] != '\0'){
467
fprintf(stderr, "Bad user ID number: \"%s\", using %"
468
PRIdMAX "\n", arg, (intmax_t)uid);
473
case 131: /* --groupid */
474
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
475
if(ret < 1 or tmpmax != (gid_t)tmpmax
476
or arg[numchars] != '\0'){
477
fprintf(stderr, "Bad group ID number: \"%s\", using %"
478
PRIdMAX "\n", arg, (intmax_t)gid);
483
case 132: /* --debug */
451
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
456
return ARGP_ERR_UNKNOWN;
461
plugin *plugin_list = NULL;
463
struct argp argp = { .options = options, .parser = parse_opt,
464
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
487
* When adding more options before this line, remember to also add a
488
* "case" to the "parse_opt_config_file" function below.
491
/* Cryptsetup always passes an argument, which is an empty
492
string if "none" was specified in /etc/crypttab. So if
493
argument was empty, we ignore it silently. */
495
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
501
return ARGP_ERR_UNKNOWN;
506
/* This option parser is the same as parse_opt() above, except it
507
ignores everything but the --config-file option. */
508
error_t parse_opt_config_file(int key, char *arg,
509
__attribute__((unused))
510
struct argp_state *state){
512
case 'g': /* --global-options */
513
case 'G': /* --global-env */
514
case 'o': /* --options-for */
515
case 'E': /* --env-for */
516
case 'd': /* --disable */
517
case 'e': /* --enable */
518
case 128: /* --plugin-dir */
520
case 129: /* --config-file */
522
argfile = strdup(arg);
527
case 130: /* --userid */
528
case 131: /* --groupid */
529
case 132: /* --debug */
534
return ARGP_ERR_UNKNOWN;
539
struct argp argp = { .options = options,
540
.parser = parse_opt_config_file,
465
542
.doc = "Mandos plugin runner -- Run plugins" };
467
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
468
if (ret == ARGP_ERR_UNKNOWN){
544
/* Parse using parse_opt_config_file() in order to get the custom
545
config file location, if any. */
546
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
547
if(ret == ARGP_ERR_UNKNOWN){
469
548
fprintf(stderr, "Unknown error while parsing arguments\n");
470
549
exitstatus = EXIT_FAILURE;
474
conffp = fopen(argfile, "r");
553
/* Reset to the normal argument parser */
554
argp.parser = parse_opt;
556
/* Open the configfile if available */
558
conffp = fopen(AFILE, "r");
560
conffp = fopen(argfile, "r");
475
562
if(conffp != NULL){
476
563
char *org_line = NULL;
477
564
char *p, *arg, *new_arg, *line;
480
566
const char whitespace_delims[] = " \r\t\f\v\n";
481
567
const char comment_delim[] = "#";
570
custom_argv = malloc(sizeof(char*) * 2);
571
if(custom_argv == NULL){
573
exitstatus = EXIT_FAILURE;
576
custom_argv[0] = argv[0];
577
custom_argv[1] = NULL;
579
/* for each line in the config file, strip whitespace and ignore
484
582
sret = getline(&org_line, &size, conffp);
495
593
new_arg = strdup(p);
496
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
497
if (custom_argv == NULL){
498
perror("add_to_argv");
499
exitstatus = EXIT_FAILURE;
596
exitstatus = EXIT_FAILURE;
602
custom_argv = realloc(custom_argv, sizeof(char *)
603
* ((unsigned int) custom_argc + 1));
604
if(custom_argv == NULL){
606
exitstatus = EXIT_FAILURE;
610
custom_argv[custom_argc-1] = new_arg;
611
custom_argv[custom_argc] = NULL;
506
616
/* Check for harmful errors and go to fallback. Other errors might
507
617
not affect opening plugins */
508
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
618
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
510
620
exitstatus = EXIT_FAILURE;
624
/* If there was any arguments from configuration file,
625
pass them to parser as command arguments */
515
626
if(custom_argv != NULL){
516
custom_argv[0] = argv[0];
517
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0,
519
if (ret == ARGP_ERR_UNKNOWN){
627
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
629
if(ret == ARGP_ERR_UNKNOWN){
520
630
fprintf(stderr, "Unknown error while parsing arguments\n");
521
631
exitstatus = EXIT_FAILURE;
636
/* Parse actual command line arguments, to let them override the
638
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
639
if(ret == ARGP_ERR_UNKNOWN){
640
fprintf(stderr, "Unknown error while parsing arguments\n");
641
exitstatus = EXIT_FAILURE;
527
646
for(plugin *p = plugin_list; p != NULL; p=p->next){
528
647
fprintf(stderr, "Plugin: %s has %d arguments\n",
898
close(pipefd[1]); /* Close unused write end of pipe */
773
close(pipefd[1]); /* close unused write end of pipe */
774
process *new_process = malloc(sizeof(process));
775
if (new_process == NULL){
777
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
900
plugin *new_plugin = getplugin(dirst->d_name);
901
if(new_plugin == NULL){
903
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
779
perror("sigprocmask");
905
perror("sigprocmask");
781
907
exitstatus = EXIT_FAILURE;
785
*new_process = (struct process){ .pid = pid,
787
.next = process_list };
789
process_list = new_process;
911
new_plugin->pid = pid;
912
new_plugin->fd = pipefd[0];
790
914
/* Unblock SIGCHLD so signal handler can be run if this process
791
915
has already completed */
792
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
916
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
794
918
perror("sigprocmask");
795
919
exitstatus = EXIT_FAILURE;
799
FD_SET(new_process->fd, &rfds_all);
923
FD_SET(new_plugin->fd, &rfds_all);
801
if (maxfd < new_process->fd){
802
maxfd = new_process->fd;
925
if(maxfd < new_plugin->fd){
926
maxfd = new_plugin->fd;
807
free_plugin_list(plugin_list);
813
if (process_list == NULL){
814
fprintf(stderr, "No plugin processes started. Incorrect plugin"
932
free_plugin(getplugin(NULL));
934
for(plugin *p = plugin_list; p != NULL; p = p->next){
939
fprintf(stderr, "No plugin processes started. Incorrect plugin"
945
/* Main loop while running plugins exist */
819
947
fd_set rfds = rfds_all;
820
948
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
821
if (select_ret == -1){
949
if(select_ret == -1){
822
950
perror("select");
823
951
exitstatus = EXIT_FAILURE;
826
954
/* OK, now either a process completed, or something can be read
827
955
from one of them */
828
for(process *proc = process_list; proc ; proc = proc->next){
956
for(plugin *proc = plugin_list; proc != NULL;){
829
957
/* Is this process completely done? */
830
if(proc->eof and proc->completed){
958
if(proc->completed and proc->eof){
831
959
/* Only accept the plugin output if it exited cleanly */
832
960
if(not WIFEXITED(proc->status)
833
961
or WEXITSTATUS(proc->status) != 0){
834
962
/* Bad exit by plugin */
836
965
if(WIFEXITED(proc->status)){
837
fprintf(stderr, "Plugin %u exited with status %d\n",
838
(unsigned int) (proc->pid),
966
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
967
" status %d\n", proc->name,
968
(intmax_t) (proc->pid),
839
969
WEXITSTATUS(proc->status));
840
} else if(WIFSIGNALED(proc->status)) {
841
fprintf(stderr, "Plugin %u killed by signal %d\n",
842
(unsigned int) (proc->pid),
970
} else if(WIFSIGNALED(proc->status)){
971
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
972
" signal %d\n", proc->name,
973
(intmax_t) (proc->pid),
843
974
WTERMSIG(proc->status));
844
975
} else if(WCOREDUMP(proc->status)){
845
fprintf(stderr, "Plugin %d dumped core\n",
846
(unsigned int) (proc->pid));
976
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
977
" core\n", proc->name, (intmax_t) (proc->pid));
849
981
/* Remove the plugin */
850
982
FD_CLR(proc->fd, &rfds_all);
851
984
/* Block signal while modifying process_list */
852
985
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
855
988
exitstatus = EXIT_FAILURE;
858
/* Delete this process entry from the list */
859
if(process_list == proc){
860
/* First one - simple */
861
process_list = proc->next;
863
/* Second one or later */
864
for(process *p = process_list; p != NULL; p = p->next){
866
p->next = proc->next;
992
plugin *next_plugin = proc->next;
871
996
/* We are done modifying process list, so unblock signal */
872
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
997
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
875
1000
perror("sigprocmask");
879
/* We deleted this process from the list, so we can't go
880
proc->next. Therefore, start over from the beginning of
1001
exitstatus = EXIT_FAILURE;
1005
if(plugin_list == NULL){
884
1012
/* This process exited nicely, so print its buffer */
886
1014
bool bret = print_out_password(proc->buffer,
887
1015
proc->buffer_length);
945
1082
perror("sigaction");
946
1083
exitstatus = EXIT_FAILURE;
949
1086
if(custom_argv != NULL){
950
for(char **arg = custom_argv; *arg != NULL; arg++){
1087
for(char **arg = custom_argv+1; *arg != NULL; arg++){
953
1090
free(custom_argv);
955
free_plugin_list(plugin_list);
957
1093
if(dir != NULL){
961
/* Free the process list and kill the processes */
962
for(process *next; process_list != NULL; process_list = next){
963
next = process_list->next;
964
close(process_list->fd);
965
ret = kill(process_list->pid, SIGTERM);
966
if(ret == -1 and errno != ESRCH){
967
/* set-uid proccesses migth not get closed */
1097
/* Kill the processes */
1098
for(plugin *p = plugin_list; p != NULL; p = p->next){
1101
ret = kill(p->pid, SIGTERM);
1102
if(ret == -1 and errno != ESRCH){
1103
/* Set-uid proccesses might not get closed */
970
free(process_list->buffer);
974
1109
/* Wait for any remaining child processes to terminate */