101
109
/* Create a new plugin */
102
110
plugin *new_plugin = malloc(sizeof(plugin));
103
111
if (new_plugin == NULL){
107
new_plugin->name = name;
114
char *copy_name = NULL;
116
copy_name = strdup(name);
117
if(copy_name == NULL){
122
*new_plugin = (plugin) { .name = copy_name,
125
.next = plugin_list };
108
127
new_plugin->argv = malloc(sizeof(char *) * 2);
109
128
if (new_plugin->argv == NULL){
113
new_plugin->argv[0] = name;
133
new_plugin->argv[0] = copy_name;
114
134
new_plugin->argv[1] = NULL;
115
new_plugin->argc = 1;
116
new_plugin->disabled = false;
117
new_plugin->next = *plugin_list;
136
new_plugin->environ = malloc(sizeof(char *));
137
if(new_plugin->environ == NULL){
139
free(new_plugin->argv);
143
new_plugin->environ[0] = NULL;
118
145
/* Append the new plugin to the list */
119
*plugin_list = new_plugin;
146
plugin_list = new_plugin;
120
147
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;
150
/* Helper function for add_argument and add_environment */
151
static bool add_to_char_array(const char *new, char ***array,
153
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
160
/* Make a copy of the new string */
161
char *copy = strdup(new);
165
/* Insert the copy */
166
(*array)[*len] = copy;
168
/* Add a new terminating NULL pointer to the last element */
169
(*array)[*len] = NULL;
173
/* Add to a plugin's argument vector */
174
static bool add_argument(plugin *p, const char *arg){
178
return add_to_char_array(arg, &(p->argv), &(p->argc));
181
/* Add to a plugin's environment */
182
static bool add_environment(plugin *p, const char *def, bool replace){
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
return add_to_char_array(def, &(p->environ), &(p->envc));
147
219
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
223
/* Mark processes as completed when they exit, and save their exit
154
225
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;
227
plugin *proc = plugin_list;
229
pid_t pid = waitpid(-1, &status, WNOHANG);
231
/* Only still running child processes */
235
if (errno != ECHILD){
238
/* No child processes */
242
/* A child exited, find it in process_list */
243
while(proc != NULL and proc->pid != pid){
247
/* Process not found in process list */
250
proc->status = status;
251
proc->completed = true;
255
/* Prints out a password to stdout */
173
256
bool print_out_password(const char *buffer, size_t length){
175
if(length>0 and buffer[length-1] == '\n'){
178
258
for(size_t written = 0; written < length; written += (size_t)ret){
179
259
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
180
260
length - written));
221
341
{ .name = "global-options", .key = 'g',
222
342
.arg = "OPTION[,OPTION[,...]]",
223
343
.doc = "Options passed to all plugins" },
344
{ .name = "global-env", .key = 'G',
346
.doc = "Environment variable passed to all plugins" },
224
347
{ .name = "options-for", .key = 'o',
225
348
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
226
349
.doc = "Options passed only to specified plugin" },
350
{ .name = "env-for", .key = 'E',
351
.arg = "PLUGIN:ENV=value",
352
.doc = "Environment variable passed to specified plugin" },
227
353
{ .name = "disable", .key = 'd',
229
355
.doc = "Disable a specific plugin", .group = 1 },
356
{ .name = "enable", .key = 'e',
358
.doc = "Enable a specific plugin", .group = 1 },
230
359
{ .name = "plugin-dir", .key = 128,
231
360
.arg = "DIRECTORY",
232
361
.doc = "Specify a different plugin directory", .group = 2 },
233
{ .name = "userid", .key = 129,
234
.arg = "ID", .flags = 0,
235
.doc = "User ID the plugins will run as", .group = 2 },
236
{ .name = "groupid", .key = 130,
237
.arg = "ID", .flags = 0,
238
.doc = "Group ID the plugins will run as", .group = 2 },
239
{ .name = "debug", .key = 131,
240
.doc = "Debug mode", .group = 3 },
362
{ .name = "config-file", .key = 129,
364
.doc = "Specify a different configuration file", .group = 2 },
365
{ .name = "userid", .key = 130,
366
.arg = "ID", .flags = 0,
367
.doc = "User ID the plugins will run as", .group = 3 },
368
{ .name = "groupid", .key = 131,
369
.arg = "ID", .flags = 0,
370
.doc = "Group ID the plugins will run as", .group = 3 },
371
{ .name = "debug", .key = 132,
372
.doc = "Debug mode", .group = 4 },
244
error_t parse_opt (int key, char *arg, struct argp_state *state) {
245
/* Get the INPUT argument from `argp_parse', which we know is a
246
pointer to our plugin list pointer. */
247
plugin **plugins = state->input;
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
251
char *p = strtok(arg, ",");
253
addargument(getplugin(NULL, plugins), p);
254
p = strtok(NULL, ",");
260
char *name = strtok(arg, ":");
261
char *p = strtok(NULL, ":");
265
addargument(getplugin(name, plugins), p);
266
p = strtok(NULL, ",");
273
getplugin(arg, plugins)->disabled = true;
379
case 'g': /* --global-options */
382
while((p = strsep(&arg, ",")) != NULL){
386
if(not add_argument(getplugin(NULL), p)){
387
perror("add_argument");
388
return ARGP_ERR_UNKNOWN;
393
case 'G': /* --global-env */
398
char *envdef = strdup(arg);
402
if(not add_environment(getplugin(NULL), envdef, true)){
403
perror("add_environment");
407
case 'o': /* --options-for */
409
char *p_name = strsep(&arg, ":");
410
if(p_name[0] == '\0' or arg == NULL){
413
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;
429
case 'E': /* --env-for */
434
char *envdef = strchr(arg, ':');
438
char *p_name = strndup(arg, (size_t) (envdef-arg));
443
if(not add_environment(getplugin(p_name), envdef, true)){
444
perror("add_environment");
448
case 'd': /* --disable */
450
plugin *p = getplugin(arg);
452
return ARGP_ERR_UNKNOWN;
457
case 'e': /* --enable */
459
plugin *p = getplugin(arg);
461
return ARGP_ERR_UNKNOWN;
466
case 128: /* --plugin-dir */
467
plugindir = strdup(arg);
468
if(plugindir == NULL){
472
case 129: /* --config-file */
473
/* This is already done by parse_opt_config_file() */
475
case 130: /* --userid */
280
476
uid = (uid_t)strtol(arg, NULL, 10);
478
case 131: /* --groupid */
283
479
gid = (gid_t)strtol(arg, NULL, 10);
481
case 132: /* --debug */
288
484
case ARGP_KEY_ARG:
289
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
485
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
490
return ARGP_ERR_UNKNOWN;
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 */
294
519
case ARGP_KEY_END:
302
plugin *plugin_list = NULL;
304
struct argp argp = { .options = options, .parser = parse_opt,
305
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
527
struct argp argp = { .options = options,
528
.parser = parse_opt_config_file,
306
530
.doc = "Mandos plugin runner -- Run plugins" };
308
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
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);
309
535
if (ret == ARGP_ERR_UNKNOWN){
310
536
fprintf(stderr, "Unknown error while parsing arguments\n");
311
537
exitstatus = EXIT_FAILURE;
316
/* This is a mangled argument in the form of
317
"+--option+--other-option=parameter+--yet-another-option", etc */
318
/* Make new argc and argv vars, and call argp_parse() again. */
319
plus_options++; /* skip the first '+' character */
320
const char delims[] = "+";
323
plus_argv = malloc(sizeof(char*) * 2);
324
if(plus_argv == NULL){
541
/* Reset to the normal argument parser */
542
argp.parser = parse_opt;
544
/* Open the configfile if available */
545
if (argfile == NULL){
546
conffp = fopen(AFILE, "r");
548
conffp = fopen(argfile, "r");
551
char *org_line = NULL;
552
char *p, *arg, *new_arg, *line;
555
const char whitespace_delims[] = " \r\t\f\v\n";
556
const char comment_delim[] = "#";
559
custom_argv = malloc(sizeof(char*) * 2);
560
if(custom_argv == NULL){
325
561
perror("malloc");
326
562
exitstatus = EXIT_FAILURE;
329
plus_argv[0] = argv[0];
331
arg = strtok(plus_options, delims); /* Get first argument */
334
plus_argv = realloc(plus_argv, sizeof(char *)
335
* ((unsigned int) new_argc + 1));
336
if(plus_argv == NULL){
338
exitstatus = EXIT_FAILURE;
341
plus_argv[new_argc-1] = arg;
342
plus_argv[new_argc] = NULL;
343
arg = strtok(NULL, delims); /* Get next argument */
345
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
565
custom_argv[0] = argv[0];
566
custom_argv[1] = NULL;
568
/* for each line in the config file, strip whitespace and ignore
571
sret = getline(&org_line, &size, conffp);
577
arg = strsep(&line, comment_delim);
578
while((p = strsep(&arg, whitespace_delims)) != NULL){
585
exitstatus = EXIT_FAILURE;
591
custom_argv = realloc(custom_argv, sizeof(char *)
592
* ((unsigned int) custom_argc + 1));
593
if(custom_argv == NULL){
595
exitstatus = EXIT_FAILURE;
599
custom_argv[custom_argc-1] = new_arg;
600
custom_argv[custom_argc] = NULL;
605
/* Check for harmful errors and go to fallback. Other errors might
606
not affect opening plugins */
607
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
609
exitstatus = EXIT_FAILURE;
613
/* If there was any arguments from configuration file,
614
pass them to parser as command arguments */
615
if(custom_argv != NULL){
616
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
346
618
if (ret == ARGP_ERR_UNKNOWN){
347
619
fprintf(stderr, "Unknown error while parsing arguments\n");
348
620
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;
354
635
for(plugin *p = plugin_list; p != NULL; p=p->next){
355
636
fprintf(stderr, "Plugin: %s has %d arguments\n",
488
plugin *p = getplugin(dirst->d_name, &plugin_list);
490
783
/* Add global arguments to argument list for this plugin */
491
plugin *g = getplugin(NULL, &plugin_list);
492
for(char **a = g->argv + 1; *a != NULL; a++){
784
plugin *g = getplugin(NULL);
786
for(char **a = g->argv + 1; *a != NULL; a++){
787
if(not add_argument(p, *a)){
788
perror("add_argument");
791
/* Add global environment variables */
792
for(char **e = g->environ; *e != NULL; e++){
793
if(not add_environment(p, *e, false)){
794
perror("add_environment");
799
/* If this plugin has any environment variables, we will call
800
using execve and need to duplicate the environment from this
802
if(p->environ[0] != NULL){
803
for(char **e = environ; *e != NULL; e++){
804
if(not add_environment(p, *e, false)){
805
perror("add_environment");
497
811
ret = pipe(pipefd);
500
814
exitstatus = EXIT_FAILURE;
817
/* Ask OS to automatic close the pipe on exec */
503
818
ret = set_cloexec_flag(pipefd[0]);
505
820
perror("set_cloexec_flag");
506
821
exitstatus = EXIT_FAILURE;
509
824
ret = set_cloexec_flag(pipefd[1]);
511
826
perror("set_cloexec_flag");
512
827
exitstatus = EXIT_FAILURE;
515
830
/* Block SIGCHLD until process is safely in process list */
516
831
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
518
833
perror("sigprocmask");
519
834
exitstatus = EXIT_FAILURE;
522
// Starting a new process to be watched
837
/* Starting a new process to be watched */
523
838
pid_t pid = fork();
841
exitstatus = EXIT_FAILURE;
525
845
/* this is the child process */
526
846
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
545
865
above and must now close it manually here. */
548
if(execv(filename, p->argv) < 0){
868
if(p->environ[0] == NULL){
869
if(execv(filename, p->argv) < 0){
874
if(execve(filename, p->argv, p->environ) < 0){
882
close(pipefd[1]); /* Close unused write end of pipe */
556
close(pipefd[1]); /* close unused write end of pipe */
557
process *new_process = malloc(sizeof(process));
558
if (new_process == NULL){
884
plugin *new_plugin = getplugin(dirst->d_name);
885
if (new_plugin == NULL){
560
887
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
562
perror("sigprocmask");
889
perror("sigprocmask");
564
891
exitstatus = EXIT_FAILURE;
568
*new_process = (struct process){ .pid = pid,
570
.next = process_list };
572
process_list = new_process;
895
new_plugin->pid = pid;
896
new_plugin->fd = pipefd[0];
573
898
/* Unblock SIGCHLD so signal handler can be run if this process
574
899
has already completed */
575
900
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
577
902
perror("sigprocmask");
578
903
exitstatus = EXIT_FAILURE;
582
FD_SET(new_process->fd, &rfds_all);
584
if (maxfd < new_process->fd){
585
maxfd = new_process->fd;
590
/* Free the plugin list */
591
for(plugin *next; plugin_list != NULL; plugin_list = next){
592
next = plugin_list->next;
593
free(plugin_list->argv);
907
FD_SET(new_plugin->fd, &rfds_all);
909
if (maxfd < new_plugin->fd){
910
maxfd = new_plugin->fd;
600
if (process_list == NULL){
601
fprintf(stderr, "No plugin processes started. Incorrect plugin"
918
for(plugin *p = plugin_list; p != NULL; p = p->next){
923
fprintf(stderr, "No plugin processes started. Incorrect plugin"
929
/* Main loop while running plugins exist */
606
931
fd_set rfds = rfds_all;
607
932
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
608
933
if (select_ret == -1){
609
934
perror("select");
610
935
exitstatus = EXIT_FAILURE;
613
938
/* OK, now either a process completed, or something can be read
614
939
from one of them */
615
for(process *proc = process_list; proc ; proc = proc->next){
940
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
616
941
/* Is this process completely done? */
617
942
if(proc->eof and proc->completed){
618
943
/* Only accept the plugin output if it exited cleanly */
619
944
if(not WIFEXITED(proc->status)
620
945
or WEXITSTATUS(proc->status) != 0){
621
946
/* Bad exit by plugin */
623
949
if(WIFEXITED(proc->status)){
624
950
fprintf(stderr, "Plugin %u exited with status %d\n",
633
959
(unsigned int) (proc->pid));
636
963
/* Remove the plugin */
637
964
FD_CLR(proc->fd, &rfds_all);
638
966
/* Block signal while modifying process_list */
639
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
967
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
641
969
perror("sigprocmask");
642
970
exitstatus = EXIT_FAILURE;
645
/* Delete this process entry from the list */
646
if(process_list == proc){
647
/* First one - simple */
648
process_list = proc->next;
650
/* Second one or later */
651
for(process *p = process_list; p != NULL; p = p->next){
653
p->next = proc->next;
658
974
/* We are done modifying process list, so unblock signal */
659
975
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
662
978
perror("sigprocmask");
666
/* We deleted this process from the list, so we can't go
667
proc->next. Therefore, start over from the beginning of
979
exitstatus = EXIT_FAILURE;
983
if(plugin_list == NULL){
671
989
/* This process exited nicely, so print its buffer */
673
bool bret = print_out_password(proc->buffer, proc->buffer_length);
991
bool bret = print_out_password(proc->buffer,
992
proc->buffer_length);
675
994
perror("print_out_password");
676
995
exitstatus = EXIT_FAILURE;
680
1000
/* This process has not completed. Does it have any output? */
681
1001
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
682
1002
/* This process had nothing to say at this time */
712
if(process_list == NULL){
1035
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1036
/* Fallback if all plugins failed, none are found or an error
714
1039
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
715
1040
char *passwordbuffer = getpass("Password: ");
716
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
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);
718
1049
perror("print_out_password");
719
1050
exitstatus = EXIT_FAILURE;
726
1054
/* Restore old signal handler */
727
sigaction(SIGCHLD, &old_sigchld_action, NULL);
731
/* Free the plugin list */
732
for(plugin *next; plugin_list != NULL; plugin_list = next){
733
next = plugin_list->next;
734
free(plugin_list->argv);
1055
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1057
perror("sigaction");
1058
exitstatus = EXIT_FAILURE;
1061
if(custom_argv != NULL){
1062
for(char **arg = custom_argv+1; *arg != NULL; arg++){
738
1068
if(dir != NULL){