28
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
33
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
33
stat, waitpid(), WIFEXITED(),
35
34
WEXITSTATUS(), wait(), pid_t,
92
82
volatile bool completed;
93
83
volatile int status;
87
typedef struct plugin{
88
char *name; /* can be NULL or any plugin name */
94
94
struct plugin *next;
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))){
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))){
109
104
/* Create a new plugin */
110
105
plugin *new_plugin = malloc(sizeof(plugin));
111
if(new_plugin == NULL){
106
if (new_plugin == NULL){
114
109
char *copy_name = NULL;
115
110
if(name != NULL){
116
111
copy_name = strdup(name);
117
112
if(copy_name == NULL){
123
117
*new_plugin = (plugin) { .name = copy_name,
125
120
.disabled = false,
126
.next = plugin_list };
121
.next = *plugin_list };
128
123
new_plugin->argv = malloc(sizeof(char *) * 2);
129
if(new_plugin->argv == NULL){
124
if (new_plugin->argv == NULL){
131
126
free(new_plugin);
134
129
new_plugin->argv[0] = copy_name;
135
130
new_plugin->argv[1] = NULL;
137
132
new_plugin->environ = malloc(sizeof(char *));
138
133
if(new_plugin->environ == NULL){
182
176
/* Add to a plugin's environment */
183
static bool add_environment(plugin *p, const char *def, bool replace){
177
static bool add_environment(plugin *p, const char *def){
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);
204
181
return add_to_char_array(def, &(p->environ), &(p->envc));
208
186
* Based on the example in the GNU LibC manual chapter 13.13 "File
209
187
* Descriptor Flags".
210
188
* *Note File Descriptor Flags:(libc)Descriptor Flags.
212
static int set_cloexec_flag(int fd){
190
static int set_cloexec_flag(int fd)
213
192
int ret = fcntl(fd, F_GETFD, 0);
214
193
/* If reading the flags failed, return error indication now. */
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;
250
char **add_to_argv(char **argv, int *argc, char *arg){
253
argv = malloc(sizeof(char*) * 2);
257
argv[0] = NULL; /* Will be set to argv[0] in main before
262
argv = realloc(argv, sizeof(char *)
263
* ((unsigned int) *argc + 1));
298
static void free_plugin_list(void){
299
while(plugin_list != NULL){
300
free_plugin(plugin_list);
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);
304
287
int main(int argc, char *argv[]){
305
char *plugindir = NULL;
306
char *argfile = NULL;
288
const char *plugindir = "/lib/mandos/plugins.d";
289
const char *argfile = ARGFILE;
308
291
size_t d_name_len;
310
293
struct dirent *dirst;
313
int ret, numchars, maxfd = 0;
316
297
uid_t uid = 65534;
317
298
gid_t gid = 65534;
318
299
bool debug = false;
343
324
{ .name = "global-options", .key = 'g',
344
325
.arg = "OPTION[,OPTION[,...]]",
345
326
.doc = "Options passed to all plugins" },
346
{ .name = "global-env", .key = 'G',
327
{ .name = "global-envs", .key = 'e',
347
328
.arg = "VAR=value",
348
329
.doc = "Environment variable passed to all plugins" },
349
330
{ .name = "options-for", .key = 'o',
350
331
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
351
332
.doc = "Options passed only to specified plugin" },
352
{ .name = "env-for", .key = 'E',
333
{ .name = "envs-for", .key = 'f',
353
334
.arg = "PLUGIN:ENV=value",
354
335
.doc = "Environment variable passed to specified plugin" },
355
336
{ .name = "disable", .key = 'd',
357
338
.doc = "Disable a specific plugin", .group = 1 },
358
{ .name = "enable", .key = 'e',
360
.doc = "Enable a specific plugin", .group = 1 },
361
339
{ .name = "plugin-dir", .key = 128,
362
340
.arg = "DIRECTORY",
363
341
.doc = "Specify a different plugin directory", .group = 2 },
364
{ .name = "config-file", .key = 129,
366
.doc = "Specify a different configuration file", .group = 2 },
367
{ .name = "userid", .key = 130,
368
.arg = "ID", .flags = 0,
369
.doc = "User ID the plugins will run as", .group = 3 },
370
{ .name = "groupid", .key = 131,
371
.arg = "ID", .flags = 0,
372
.doc = "Group ID the plugins will run as", .group = 3 },
373
{ .name = "debug", .key = 132,
374
.doc = "Debug mode", .group = 4 },
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 },
378
error_t parse_opt(int key, char *arg, __attribute__((unused))
379
struct argp_state *state) {
381
case 'g': /* --global-options */
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;
384
361
while((p = strsep(&arg, ",")) != NULL){
385
362
if(p[0] == '\0'){
388
if(not add_argument(getplugin(NULL), p)){
365
if(not add_argument(getplugin(NULL, plugins), p)){
389
366
perror("add_argument");
390
367
return ARGP_ERR_UNKNOWN;
395
case 'G': /* --global-env */
399
if(not add_environment(getplugin(NULL), arg, true)){
400
perror("add_environment");
377
char *envdef = strdup(arg);
381
if(not add_environment(getplugin(NULL, plugins), envdef)){
382
perror("add_environment");
403
case 'o': /* --options-for */
405
388
char *p_name = strsep(&arg, ":");
406
if(p_name[0] == '\0' or arg == NULL){
389
if(p_name[0] == '\0'){
409
392
char *opt = strsep(&arg, ":");
410
if(opt[0] == '\0' or opt == NULL){
414
while((p = strsep(&opt, ",")) != NULL){
418
if(not add_argument(getplugin(p_name), p)){
419
perror("add_argument");
420
return ARGP_ERR_UNKNOWN;
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;
425
case 'E': /* --env-for */
431
416
if(envdef == NULL){
435
if(not add_environment(getplugin(arg), envdef+1, true)){
419
char *p_name = strndup(arg, (size_t) (envdef-arg));
424
if(not add_environment(getplugin(p_name, plugins), envdef)){
436
425
perror("add_environment");
440
case 'd': /* --disable */
442
plugin *p = getplugin(arg);
431
plugin *p = getplugin(arg, plugins);
444
433
return ARGP_ERR_UNKNOWN;
446
435
p->disabled = true;
449
case 'e': /* --enable */
451
plugin *p = getplugin(arg);
453
return ARGP_ERR_UNKNOWN;
458
case 128: /* --plugin-dir */
460
plugindir = strdup(arg);
461
if(plugindir == NULL){
465
case 129: /* --config-file */
466
/* This is already done by parse_opt_config_file() */
468
case 130: /* --userid */
469
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
470
if(ret < 1 or tmpmax != (uid_t)tmpmax
471
or arg[numchars] != '\0'){
472
fprintf(stderr, "Bad user ID number: \"%s\", using %"
473
PRIdMAX "\n", arg, (intmax_t)uid);
478
case 131: /* --groupid */
479
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
480
if(ret < 1 or tmpmax != (gid_t)tmpmax
481
or arg[numchars] != '\0'){
482
fprintf(stderr, "Bad group ID number: \"%s\", using %"
483
PRIdMAX "\n", arg, (intmax_t)gid);
488
case 132: /* --debug */
442
uid = (uid_t)strtol(arg, NULL, 10);
445
gid = (gid_t)strtol(arg, NULL, 10);
492
* When adding more options before this line, remember to also add a
493
* "case" to the "parse_opt_config_file" function below.
496
/* Cryptsetup always passes an argument, which is an empty
497
string if "none" was specified in /etc/crypttab. So if
498
argument was empty, we ignore it silently. */
500
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
506
return ARGP_ERR_UNKNOWN;
511
/* This option parser is the same as parse_opt() above, except it
512
ignores everything but the --config-file option. */
513
error_t parse_opt_config_file(int key, char *arg,
514
__attribute__((unused))
515
struct argp_state *state) {
517
case 'g': /* --global-options */
518
case 'G': /* --global-env */
519
case 'o': /* --options-for */
520
case 'E': /* --env-for */
521
case 'd': /* --disable */
522
case 'e': /* --enable */
523
case 128: /* --plugin-dir */
525
case 129: /* --config-file */
527
argfile = strdup(arg);
532
case 130: /* --userid */
533
case 131: /* --groupid */
534
case 132: /* --debug */
539
return ARGP_ERR_UNKNOWN;
544
struct argp argp = { .options = options,
545
.parser = parse_opt_config_file,
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]",
547
465
.doc = "Mandos plugin runner -- Run plugins" };
549
/* Parse using parse_opt_config_file() in order to get the custom
550
config file location, if any. */
551
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
552
if(ret == ARGP_ERR_UNKNOWN){
467
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
468
if (ret == ARGP_ERR_UNKNOWN){
553
469
fprintf(stderr, "Unknown error while parsing arguments\n");
554
470
exitstatus = EXIT_FAILURE;
558
/* Reset to the normal argument parser */
559
argp.parser = parse_opt;
561
/* Open the configfile if available */
563
conffp = fopen(AFILE, "r");
565
conffp = fopen(argfile, "r");
474
conffp = fopen(argfile, "r");
567
475
if(conffp != NULL){
568
476
char *org_line = NULL;
569
477
char *p, *arg, *new_arg, *line;
571
480
const char whitespace_delims[] = " \r\t\f\v\n";
572
481
const char comment_delim[] = "#";
575
custom_argv = malloc(sizeof(char*) * 2);
576
if(custom_argv == NULL){
578
exitstatus = EXIT_FAILURE;
581
custom_argv[0] = argv[0];
582
custom_argv[1] = NULL;
584
/* for each line in the config file, strip whitespace and ignore
587
484
sret = getline(&org_line, &size, conffp);
598
495
new_arg = strdup(p);
601
exitstatus = EXIT_FAILURE;
607
custom_argv = realloc(custom_argv, sizeof(char *)
608
* ((unsigned int) custom_argc + 1));
609
if(custom_argv == NULL){
611
exitstatus = EXIT_FAILURE;
615
custom_argv[custom_argc-1] = new_arg;
616
custom_argv[custom_argc] = NULL;
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;
621
506
/* Check for harmful errors and go to fallback. Other errors might
622
507
not affect opening plugins */
623
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
508
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
625
510
exitstatus = EXIT_FAILURE;
629
/* If there was any arguments from configuration file,
630
pass them to parser as command arguments */
631
515
if(custom_argv != NULL){
632
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
634
if(ret == ARGP_ERR_UNKNOWN){
516
custom_argv[0] = argv[0];
517
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0,
519
if (ret == ARGP_ERR_UNKNOWN){
635
520
fprintf(stderr, "Unknown error while parsing arguments\n");
636
521
exitstatus = EXIT_FAILURE;
641
/* Parse actual command line arguments, to let them override the
643
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
644
if(ret == ARGP_ERR_UNKNOWN){
645
fprintf(stderr, "Unknown error while parsing arguments\n");
646
exitstatus = EXIT_FAILURE;
651
527
for(plugin *p = plugin_list; p != NULL; p=p->next){
652
528
fprintf(stderr, "Plugin: %s has %d arguments\n",
903
close(pipefd[1]); /* Close unused write end of pipe */
905
plugin *new_plugin = getplugin(dirst->d_name);
906
if(new_plugin == NULL){
908
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
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);
910
perror("sigprocmask");
779
perror("sigprocmask");
912
781
exitstatus = EXIT_FAILURE;
916
new_plugin->pid = pid;
917
new_plugin->fd = pipefd[0];
785
*new_process = (struct process){ .pid = pid,
787
.next = process_list };
789
process_list = new_process;
919
790
/* Unblock SIGCHLD so signal handler can be run if this process
920
791
has already completed */
921
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
792
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
923
794
perror("sigprocmask");
924
795
exitstatus = EXIT_FAILURE;
928
FD_SET(new_plugin->fd, &rfds_all);
799
FD_SET(new_process->fd, &rfds_all);
930
if(maxfd < new_plugin->fd){
931
maxfd = new_plugin->fd;
801
if (maxfd < new_process->fd){
802
maxfd = new_process->fd;
807
free_plugin_list(plugin_list);
938
for(plugin *p = plugin_list; p != NULL; p = p->next){
943
fprintf(stderr, "No plugin processes started. Incorrect plugin"
813
if (process_list == NULL){
814
fprintf(stderr, "No plugin processes started. Incorrect plugin"
949
/* Main loop while running plugins exist */
951
819
fd_set rfds = rfds_all;
952
820
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
953
if(select_ret == -1){
821
if (select_ret == -1){
954
822
perror("select");
955
823
exitstatus = EXIT_FAILURE;
958
826
/* OK, now either a process completed, or something can be read
959
827
from one of them */
960
for(plugin *proc = plugin_list; proc != NULL;){
828
for(process *proc = process_list; proc ; proc = proc->next){
961
829
/* Is this process completely done? */
962
830
if(proc->eof and proc->completed){
963
831
/* Only accept the plugin output if it exited cleanly */
964
832
if(not WIFEXITED(proc->status)
965
833
or WEXITSTATUS(proc->status) != 0){
966
834
/* Bad exit by plugin */
969
836
if(WIFEXITED(proc->status)){
970
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
971
" %d\n", (intmax_t) (proc->pid),
837
fprintf(stderr, "Plugin %u exited with status %d\n",
838
(unsigned int) (proc->pid),
972
839
WEXITSTATUS(proc->status));
973
840
} else if(WIFSIGNALED(proc->status)) {
974
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
975
" %d\n", (intmax_t) (proc->pid),
841
fprintf(stderr, "Plugin %u killed by signal %d\n",
842
(unsigned int) (proc->pid),
976
843
WTERMSIG(proc->status));
977
844
} else if(WCOREDUMP(proc->status)){
978
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
979
(intmax_t) (proc->pid));
845
fprintf(stderr, "Plugin %d dumped core\n",
846
(unsigned int) (proc->pid));
983
849
/* Remove the plugin */
984
850
FD_CLR(proc->fd, &rfds_all);
986
851
/* Block signal while modifying process_list */
987
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
990
855
exitstatus = EXIT_FAILURE;
994
plugin *next_plugin = proc->next;
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;
998
871
/* We are done modifying process list, so unblock signal */
999
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
872
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
1002
875
perror("sigprocmask");
1003
exitstatus = EXIT_FAILURE;
1007
if(plugin_list == NULL){
879
/* We deleted this process from the list, so we can't go
880
proc->next. Therefore, start over from the beginning of
1014
884
/* This process exited nicely, so print its buffer */
1016
886
bool bret = print_out_password(proc->buffer,
1017
887
proc->buffer_length);
1084
945
perror("sigaction");
1085
946
exitstatus = EXIT_FAILURE;
1088
949
if(custom_argv != NULL){
1089
for(char **arg = custom_argv+1; *arg != NULL; arg++){
950
for(char **arg = custom_argv; *arg != NULL; arg++){
1092
953
free(custom_argv);
955
free_plugin_list(plugin_list);
1095
957
if(dir != NULL){
1099
/* Kill the processes */
1100
for(plugin *p = plugin_list; p != NULL; p = p->next){
1103
ret = kill(p->pid, SIGTERM);
1104
if(ret == -1 and errno != ESRCH){
1105
/* Set-uid proccesses might not get closed */
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 */
970
free(process_list->buffer);
1111
974
/* Wait for any remaining child processes to terminate */