92
84
volatile bool completed;
93
85
volatile int status;
89
typedef struct plugin{
90
char *name; /* can be NULL or any plugin name */
94
96
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){
99
static plugin *getplugin(char *name, plugin **plugin_list){
100
for (plugin *p = *plugin_list; p != NULL; p = p->next){
104
101
if ((p->name == name)
105
102
or (p->name and name and (strcmp(p->name, name) == 0))){
181
178
/* Add to a plugin's environment */
182
static bool add_environment(plugin *p, const char *def, bool replace){
179
static bool add_environment(plugin *p, const char *def){
186
/* namelen = length of name of environment variable */
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen + 1) == 0){
191
/* It already exists */
193
char *new = realloc(*e, strlen(def) + 1);
203
183
return add_to_char_array(def, &(p->environ), &(p->envc));
207
188
* Based on the example in the GNU LibC manual chapter 13.13 "File
208
189
* Descriptor Flags".
219
200
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
203
process *process_list = NULL;
223
205
/* Mark processes as completed when they exit, and save their exit
225
207
void handle_sigchld(__attribute__((unused)) int sig){
227
plugin *proc = plugin_list;
209
process *proc = process_list;
229
211
pid_t pid = waitpid(-1, &status, WNOHANG);
255
/* Prints out a password to stdout */
256
237
bool print_out_password(const char *buffer, size_t length){
239
if(length>0 and buffer[length-1] == '\n'){
258
242
for(size_t written = 0; written < length; written += (size_t)ret){
259
243
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
260
244
length - written));
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;
298
static void free_plugin_list(void){
299
while(plugin_list != NULL){
300
free_plugin(plugin_list);
252
static void free_plugin_list(plugin *plugin_list){
253
for(plugin *next; plugin_list != NULL; plugin_list = next){
254
next = plugin_list->next;
255
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
258
free(plugin_list->argv);
259
for(char **env = plugin_list->environ; *env != NULL; env++){
262
free(plugin_list->environ);
341
304
{ .name = "global-options", .key = 'g',
342
305
.arg = "OPTION[,OPTION[,...]]",
343
306
.doc = "Options passed to all plugins" },
344
{ .name = "global-env", .key = 'G',
307
{ .name = "global-envs", .key = 'e',
345
308
.arg = "VAR=value",
346
309
.doc = "Environment variable passed to all plugins" },
347
310
{ .name = "options-for", .key = 'o',
348
311
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
349
312
.doc = "Options passed only to specified plugin" },
350
{ .name = "env-for", .key = 'E',
313
{ .name = "envs-for", .key = 'f',
351
314
.arg = "PLUGIN:ENV=value",
352
315
.doc = "Environment variable passed to specified plugin" },
353
316
{ .name = "disable", .key = 'd',
355
318
.doc = "Disable a specific plugin", .group = 1 },
356
{ .name = "enable", .key = 'e',
358
.doc = "Enable a specific plugin", .group = 1 },
359
319
{ .name = "plugin-dir", .key = 128,
360
320
.arg = "DIRECTORY",
361
321
.doc = "Specify a different plugin directory", .group = 2 },
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
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;
379
case 'g': /* --global-options */
380
342
if (arg != NULL){
382
344
while((p = strsep(&arg, ",")) != NULL){
383
345
if(p[0] == '\0'){
386
if(not add_argument(getplugin(NULL), p)){
348
if(not add_argument(getplugin(NULL, plugins), p)){
387
349
perror("add_argument");
388
350
return ARGP_ERR_UNKNOWN;
393
case 'G': /* --global-env */
399
361
if(envdef == NULL){
402
if(not add_environment(getplugin(NULL), envdef, true)){
364
if(not add_environment(getplugin(NULL, plugins), envdef)){
403
365
perror("add_environment");
407
case 'o': /* --options-for */
408
370
if (arg != NULL){
409
371
char *p_name = strsep(&arg, ":");
410
if(p_name[0] == '\0' or arg == NULL){
372
if(p_name[0] == '\0'){
413
375
char *opt = strsep(&arg, ":");
414
if(opt[0] == '\0' or opt == NULL){
418
while((p = strsep(&opt, ",")) != NULL){
422
if(not add_argument(getplugin(p_name), p)){
423
perror("add_argument");
424
return ARGP_ERR_UNKNOWN;
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;
429
case 'E': /* --env-for */
443
if(not add_environment(getplugin(p_name), envdef, true)){
407
if(not add_environment(getplugin(p_name, plugins), envdef)){
444
408
perror("add_environment");
448
case 'd': /* --disable */
449
413
if (arg != NULL){
450
plugin *p = getplugin(arg);
414
plugin *p = getplugin(arg, plugins);
452
416
return ARGP_ERR_UNKNOWN;
454
418
p->disabled = true;
457
case 'e': /* --enable */
459
plugin *p = getplugin(arg);
461
return ARGP_ERR_UNKNOWN;
466
case 128: /* --plugin-dir */
467
422
plugindir = strdup(arg);
468
423
if(plugindir == NULL){
469
424
perror("strdup");
472
case 129: /* --config-file */
473
/* This is already done by parse_opt_config_file() */
475
case 130: /* --userid */
428
argfile = strdup(arg);
476
434
uid = (uid_t)strtol(arg, NULL, 10);
478
case 131: /* --groupid */
479
437
gid = (gid_t)strtol(arg, NULL, 10);
481
case 132: /* --debug */
484
442
case ARGP_KEY_ARG:
495
/* This option parser is the same as parse_opt() above, except it
496
ignores everything but the --config-file option. */
497
error_t parse_opt_config_file (int key, char *arg,
498
__attribute__((unused))
499
struct argp_state *state) {
501
case 'g': /* --global-options */
502
case 'G': /* --global-env */
503
case 'o': /* --options-for */
504
case 'E': /* --env-for */
505
case 'd': /* --disable */
506
case 'e': /* --enable */
507
case 128: /* --plugin-dir */
509
case 129: /* --config-file */
510
argfile = strdup(arg);
515
case 130: /* --userid */
516
case 131: /* --groupid */
517
case 132: /* --debug */
522
return ARGP_ERR_UNKNOWN;
453
plugin *plugin_list = NULL;
527
struct argp argp = { .options = options,
528
.parser = parse_opt_config_file,
455
struct argp argp = { .options = options, .parser = parse_opt,
456
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
530
457
.doc = "Mandos plugin runner -- Run plugins" };
532
/* Parse using the parse_opt_config_file in order to get the custom
533
config file location, if any. */
534
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
459
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
535
460
if (ret == ARGP_ERR_UNKNOWN){
536
461
fprintf(stderr, "Unknown error while parsing arguments\n");
537
462
exitstatus = EXIT_FAILURE;
541
/* Reset to the normal argument parser */
542
argp.parser = parse_opt;
544
/* Open the configfile if available */
545
466
if (argfile == NULL){
546
467
conffp = fopen(AFILE, "r");
548
469
conffp = fopen(argfile, "r");
550
472
if(conffp != NULL){
551
473
char *org_line = NULL;
552
474
char *p, *arg, *new_arg, *line;
613
/* If there was any arguments from configuration file,
614
pass them to parser as command arguments */
615
534
if(custom_argv != NULL){
616
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
535
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
618
536
if (ret == ARGP_ERR_UNKNOWN){
619
537
fprintf(stderr, "Unknown error while parsing arguments\n");
620
538
exitstatus = EXIT_FAILURE;
625
/* Parse actual command line arguments, to let them override the
627
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
628
if (ret == ARGP_ERR_UNKNOWN){
629
fprintf(stderr, "Unknown error while parsing arguments\n");
630
exitstatus = EXIT_FAILURE;
635
544
for(plugin *p = plugin_list; p != NULL; p=p->next){
636
545
fprintf(stderr, "Plugin: %s has %d arguments\n",
783
691
/* Add global arguments to argument list for this plugin */
784
plugin *g = getplugin(NULL);
692
plugin *g = getplugin(NULL, &plugin_list);
786
694
for(char **a = g->argv + 1; *a != NULL; a++){
787
695
if(not add_argument(p, *a)){
791
699
/* Add global environment variables */
792
700
for(char **e = g->environ; *e != NULL; e++){
793
if(not add_environment(p, *e, false)){
701
if(not add_environment(p, *e)){
794
702
perror("add_environment");
802
710
if(p->environ[0] != NULL){
803
711
for(char **e = environ; *e != NULL; e++){
804
if(not add_environment(p, *e, false)){
712
char *copy = strdup(*e);
717
if(not add_environment(p, copy)){
805
718
perror("add_environment");
882
close(pipefd[1]); /* Close unused write end of pipe */
884
plugin *new_plugin = getplugin(dirst->d_name);
885
if (new_plugin == NULL){
795
close(pipefd[1]); /* close unused write end of pipe */
796
process *new_process = malloc(sizeof(process));
797
if (new_process == NULL){
887
799
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
889
perror("sigprocmask");
801
perror("sigprocmask");
891
803
exitstatus = EXIT_FAILURE;
895
new_plugin->pid = pid;
896
new_plugin->fd = pipefd[0];
807
*new_process = (struct process){ .pid = pid,
809
.next = process_list };
811
process_list = new_process;
898
812
/* Unblock SIGCHLD so signal handler can be run if this process
899
813
has already completed */
900
814
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
907
FD_SET(new_plugin->fd, &rfds_all);
821
FD_SET(new_process->fd, &rfds_all);
909
if (maxfd < new_plugin->fd){
910
maxfd = new_plugin->fd;
823
if (maxfd < new_process->fd){
824
maxfd = new_process->fd;
829
free_plugin_list(plugin_list);
918
for(plugin *p = plugin_list; p != NULL; p = p->next){
923
fprintf(stderr, "No plugin processes started. Incorrect plugin"
835
if (process_list == NULL){
836
fprintf(stderr, "No plugin processes started. Incorrect plugin"
929
/* Main loop while running plugins exist */
931
841
fd_set rfds = rfds_all;
932
842
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
933
843
if (select_ret == -1){
938
848
/* OK, now either a process completed, or something can be read
939
849
from one of them */
940
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
850
for(process *proc = process_list; proc ; proc = proc->next){
941
851
/* Is this process completely done? */
942
852
if(proc->eof and proc->completed){
943
853
/* Only accept the plugin output if it exited cleanly */
944
854
if(not WIFEXITED(proc->status)
945
855
or WEXITSTATUS(proc->status) != 0){
946
856
/* Bad exit by plugin */
949
858
if(WIFEXITED(proc->status)){
950
859
fprintf(stderr, "Plugin %u exited with status %d\n",
959
868
(unsigned int) (proc->pid));
963
871
/* Remove the plugin */
964
872
FD_CLR(proc->fd, &rfds_all);
966
873
/* Block signal while modifying process_list */
967
874
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
970
877
exitstatus = EXIT_FAILURE;
880
/* Delete this process entry from the list */
881
if(process_list == proc){
882
/* First one - simple */
883
process_list = proc->next;
885
/* Second one or later */
886
for(process *p = process_list; p != NULL; p = p->next){
888
p->next = proc->next;
974
893
/* We are done modifying process list, so unblock signal */
975
894
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
978
897
perror("sigprocmask");
979
exitstatus = EXIT_FAILURE;
983
if(plugin_list == NULL){
901
/* We deleted this process from the list, so we can't go
902
proc->next. Therefore, start over from the beginning of
989
906
/* This process exited nicely, so print its buffer */
991
908
bool bret = print_out_password(proc->buffer,
1035
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
951
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1036
952
/* Fallback if all plugins failed, none are found or an error
1039
955
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1040
956
char *passwordbuffer = getpass("Password: ");
1041
size_t len = strlen(passwordbuffer);
1042
/* Strip trailing newline */
1043
if(len > 0 and passwordbuffer[len-1] == '\n'){
1044
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1047
bret = print_out_password(passwordbuffer, len);
957
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1049
959
perror("print_out_password");
1050
960
exitstatus = EXIT_FAILURE;
1065
975
free(custom_argv);
977
free_plugin_list(plugin_list);
1068
979
if(dir != NULL){
1072
983
/* Free the process list and kill the processes */
1073
for(plugin *p = plugin_list; p != NULL; p = p->next){
1076
ret = kill(p->pid, SIGTERM);
1077
if(ret == -1 and errno != ESRCH){
1078
/* Set-uid proccesses might not get closed */
984
for(process *next; process_list != NULL; process_list = next){
985
next = process_list->next;
986
close(process_list->fd);
987
ret = kill(process_list->pid, SIGTERM);
988
if(ret == -1 and errno != ESRCH){
989
/* set-uid proccesses migth not get closed */
992
free(process_list->buffer);
1084
996
/* Wait for any remaining child processes to terminate */