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,
47
46
fcntl(), setuid(), setgid(),
48
47
F_GETFD, F_SETFD, FD_CLOEXEC,
49
48
access(), pipe(), fork(), close()
50
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
51
50
execv(), write(), read(),
53
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
64
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
64
SIG_UNBLOCK, kill() */
66
65
#include <errno.h> /* errno, EBADF */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
69
67
#define BUFFER_SIZE 256
71
69
#define PDIR "/lib/mandos/plugins.d"
72
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
74
const char *argp_program_version = "plugin-runner " VERSION;
72
const char *argp_program_version = "plugin-runner 1.0";
75
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
77
typedef struct process{
84
volatile bool completed;
77
89
typedef struct plugin{
78
90
char *name; /* can be NULL or any plugin name */
85
/* Variables used for running processes*/
92
volatile sig_atomic_t completed;
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){
105
or (p->name and name and (strcmp(p->name, name) == 0))){
99
static plugin *getplugin(char *name, plugin **plugin_list){
100
for (plugin *p = *plugin_list; p != NULL; p = p->next){
101
if ((p->name == name)
102
or (p->name and name and (strcmp(p->name, name) == 0))){
109
106
/* Create a new plugin */
110
107
plugin *new_plugin = malloc(sizeof(plugin));
111
if(new_plugin == NULL){
108
if (new_plugin == NULL){
114
111
char *copy_name = NULL;
115
112
if(name != NULL){
116
113
copy_name = strdup(name);
117
114
if(copy_name == NULL){
123
*new_plugin = (plugin){ .name = copy_name,
126
.next = plugin_list };
119
*new_plugin = (plugin) { .name = copy_name,
123
.next = *plugin_list };
128
125
new_plugin->argv = malloc(sizeof(char *) * 2);
129
if(new_plugin->argv == NULL){
126
if (new_plugin->argv == NULL){
131
128
free(new_plugin);
134
131
new_plugin->argv[0] = copy_name;
135
132
new_plugin->argv[1] = NULL;
137
134
new_plugin->environ = malloc(sizeof(char *));
138
135
if(new_plugin->environ == NULL){
182
178
/* Add to a plugin's environment */
183
static bool add_environment(plugin *p, const char *def, bool replace){
179
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
183
return add_to_char_array(def, &(p->environ), &(p->envc));
208
188
* Based on the example in the GNU LibC manual chapter 13.13 "File
209
189
* Descriptor Flags".
210
190
* *Note File Descriptor Flags:(libc)Descriptor Flags.
212
static int set_cloexec_flag(int fd){
192
static int set_cloexec_flag(int fd)
213
194
int ret = fcntl(fd, F_GETFD, 0);
214
195
/* If reading the flags failed, return error indication now. */
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;
300
static void free_plugin_list(void){
301
while(plugin_list != NULL){
302
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);
345
304
{ .name = "global-options", .key = 'g',
346
305
.arg = "OPTION[,OPTION[,...]]",
347
306
.doc = "Options passed to all plugins" },
348
{ .name = "global-env", .key = 'G',
307
{ .name = "global-envs", .key = 'e',
349
308
.arg = "VAR=value",
350
309
.doc = "Environment variable passed to all plugins" },
351
310
{ .name = "options-for", .key = 'o',
352
311
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
353
312
.doc = "Options passed only to specified plugin" },
354
{ .name = "env-for", .key = 'E',
313
{ .name = "envs-for", .key = 'f',
355
314
.arg = "PLUGIN:ENV=value",
356
315
.doc = "Environment variable passed to specified plugin" },
357
316
{ .name = "disable", .key = 'd',
359
318
.doc = "Disable a specific plugin", .group = 1 },
360
{ .name = "enable", .key = 'e',
362
.doc = "Enable a specific plugin", .group = 1 },
363
319
{ .name = "plugin-dir", .key = 128,
364
320
.arg = "DIRECTORY",
365
321
.doc = "Specify a different plugin directory", .group = 2 },
380
error_t parse_opt(int key, char *arg, __attribute__((unused))
381
struct argp_state *state){
383
case 'g': /* --global-options */
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;
386
344
while((p = strsep(&arg, ",")) != NULL){
387
345
if(p[0] == '\0'){
390
if(not add_argument(getplugin(NULL), p)){
348
if(not add_argument(getplugin(NULL, plugins), p)){
391
349
perror("add_argument");
392
350
return ARGP_ERR_UNKNOWN;
397
case 'G': /* --global-env */
401
if(not add_environment(getplugin(NULL), arg, true)){
402
perror("add_environment");
360
char *envdef = strdup(arg);
364
if(not add_environment(getplugin(NULL, plugins), envdef)){
365
perror("add_environment");
405
case 'o': /* --options-for */
407
371
char *p_name = strsep(&arg, ":");
408
if(p_name[0] == '\0' or arg == NULL){
372
if(p_name[0] == '\0'){
411
375
char *opt = strsep(&arg, ":");
412
if(opt[0] == '\0' or opt == NULL){
416
while((p = strsep(&opt, ",")) != NULL){
420
if(not add_argument(getplugin(p_name), p)){
421
perror("add_argument");
422
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;
427
case 'E': /* --env-for */
433
399
if(envdef == NULL){
437
if(not add_environment(getplugin(arg), envdef+1, true)){
402
char *p_name = strndup(arg, (size_t) (envdef-arg));
407
if(not add_environment(getplugin(p_name, plugins), envdef)){
438
408
perror("add_environment");
442
case 'd': /* --disable */
444
plugin *p = getplugin(arg);
414
plugin *p = getplugin(arg, plugins);
446
416
return ARGP_ERR_UNKNOWN;
448
418
p->disabled = true;
451
case 'e': /* --enable */
453
plugin *p = getplugin(arg);
455
return ARGP_ERR_UNKNOWN;
460
case 128: /* --plugin-dir */
462
422
plugindir = strdup(arg);
463
423
if(plugindir == NULL){
464
424
perror("strdup");
467
case 129: /* --config-file */
468
/* This is already done by parse_opt_config_file() */
470
case 130: /* --userid */
471
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
472
if(ret < 1 or tmpmax != (uid_t)tmpmax
473
or arg[numchars] != '\0'){
474
fprintf(stderr, "Bad user ID number: \"%s\", using %"
475
PRIdMAX "\n", arg, (intmax_t)uid);
480
case 131: /* --groupid */
481
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
482
if(ret < 1 or tmpmax != (gid_t)tmpmax
483
or arg[numchars] != '\0'){
484
fprintf(stderr, "Bad group ID number: \"%s\", using %"
485
PRIdMAX "\n", arg, (intmax_t)gid);
490
case 132: /* --debug */
494
* When adding more options before this line, remember to also add a
495
* "case" to the "parse_opt_config_file" function below.
498
/* Cryptsetup always passes an argument, which is an empty
499
string if "none" was specified in /etc/crypttab. So if
500
argument was empty, we ignore it silently. */
502
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
508
return ARGP_ERR_UNKNOWN;
513
/* This option parser is the same as parse_opt() above, except it
514
ignores everything but the --config-file option. */
515
error_t parse_opt_config_file(int key, char *arg,
516
__attribute__((unused))
517
struct argp_state *state){
519
case 'g': /* --global-options */
520
case 'G': /* --global-env */
521
case 'o': /* --options-for */
522
case 'E': /* --env-for */
523
case 'd': /* --disable */
524
case 'e': /* --enable */
525
case 128: /* --plugin-dir */
527
case 129: /* --config-file */
529
428
argfile = strdup(arg);
530
429
if(argfile == NULL){
531
430
perror("strdup");
534
case 130: /* --userid */
535
case 131: /* --groupid */
536
case 132: /* --debug */
434
uid = (uid_t)strtol(arg, NULL, 10);
437
gid = (gid_t)strtol(arg, NULL, 10);
537
442
case ARGP_KEY_ARG:
443
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
538
445
case ARGP_KEY_END:
546
struct argp argp = { .options = options,
547
.parser = parse_opt_config_file,
453
plugin *plugin_list = NULL;
455
struct argp argp = { .options = options, .parser = parse_opt,
456
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
549
457
.doc = "Mandos plugin runner -- Run plugins" };
551
/* Parse using parse_opt_config_file() in order to get the custom
552
config file location, if any. */
553
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
554
if(ret == ARGP_ERR_UNKNOWN){
459
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
460
if (ret == ARGP_ERR_UNKNOWN){
555
461
fprintf(stderr, "Unknown error while parsing arguments\n");
556
462
exitstatus = EXIT_FAILURE;
560
/* Reset to the normal argument parser */
561
argp.parser = parse_opt;
563
/* Open the configfile if available */
466
if (argfile == NULL){
565
467
conffp = fopen(AFILE, "r");
567
469
conffp = fopen(argfile, "r");
569
472
if(conffp != NULL){
570
473
char *org_line = NULL;
571
474
char *p, *arg, *new_arg, *line;
573
477
const char whitespace_delims[] = " \r\t\f\v\n";
574
478
const char comment_delim[] = "#";
623
525
/* Check for harmful errors and go to fallback. Other errors might
624
526
not affect opening plugins */
625
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
527
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
627
529
exitstatus = EXIT_FAILURE;
631
/* If there was any arguments from configuration file,
632
pass them to parser as command arguments */
633
534
if(custom_argv != NULL){
634
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
636
if(ret == ARGP_ERR_UNKNOWN){
535
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
536
if (ret == ARGP_ERR_UNKNOWN){
637
537
fprintf(stderr, "Unknown error while parsing arguments\n");
638
538
exitstatus = EXIT_FAILURE;
643
/* Parse actual command line arguments, to let them override the
645
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
646
if(ret == ARGP_ERR_UNKNOWN){
647
fprintf(stderr, "Unknown error while parsing arguments\n");
648
exitstatus = EXIT_FAILURE;
653
544
for(plugin *p = plugin_list; p != NULL; p=p->next){
654
545
fprintf(stderr, "Plugin: %s has %d arguments\n",
656
547
for(char **a = p->argv; *a != NULL; a++){
657
548
fprintf(stderr, "\tArg: %s\n", *a);
659
fprintf(stderr, "...and %d environment variables\n", p->envc);
550
fprintf(stderr, "...and %u environment variables\n", p->envc);
660
551
for(char **a = p->environ; *a != NULL; a++){
661
552
fprintf(stderr, "\t%s\n", *a);
666
/* Strip permissions down to nobody */
669
564
perror("setgid");
676
if(plugindir == NULL){
567
if (plugindir == NULL){
677
568
dir = opendir(PDIR);
679
570
dir = opendir(plugindir);
764
if(plugindir == NULL){
765
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
767
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
655
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
770
657
perror("asprintf");
774
661
ret = stat(filename, &st);
781
/* Ignore non-executable files */
782
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
668
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
784
670
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
785
671
" with bad type or mode\n", filename);
905
close(pipefd[1]); /* Close unused write end of pipe */
907
plugin *new_plugin = getplugin(dirst->d_name);
908
if(new_plugin == NULL){
910
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
795
close(pipefd[1]); /* close unused write end of pipe */
796
process *new_process = malloc(sizeof(process));
797
if (new_process == NULL){
799
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
912
perror("sigprocmask");
801
perror("sigprocmask");
914
803
exitstatus = EXIT_FAILURE;
918
new_plugin->pid = pid;
919
new_plugin->fd = pipefd[0];
807
*new_process = (struct process){ .pid = pid,
809
.next = process_list };
811
process_list = new_process;
921
812
/* Unblock SIGCHLD so signal handler can be run if this process
922
813
has already completed */
923
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
814
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
925
816
perror("sigprocmask");
926
817
exitstatus = EXIT_FAILURE;
930
FD_SET(new_plugin->fd, &rfds_all);
821
FD_SET(new_process->fd, &rfds_all);
932
if(maxfd < new_plugin->fd){
933
maxfd = new_plugin->fd;
823
if (maxfd < new_process->fd){
824
maxfd = new_process->fd;
829
free_plugin_list(plugin_list);
939
free_plugin(getplugin(NULL));
941
for(plugin *p = plugin_list; p != NULL; p = p->next){
946
fprintf(stderr, "No plugin processes started. Incorrect plugin"
835
if (process_list == NULL){
836
fprintf(stderr, "No plugin processes started. Incorrect plugin"
952
/* Main loop while running plugins exist */
954
841
fd_set rfds = rfds_all;
955
842
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
956
if(select_ret == -1){
843
if (select_ret == -1){
957
844
perror("select");
958
845
exitstatus = EXIT_FAILURE;
961
848
/* OK, now either a process completed, or something can be read
962
849
from one of them */
963
for(plugin *proc = plugin_list; proc != NULL;){
850
for(process *proc = process_list; proc ; proc = proc->next){
964
851
/* Is this process completely done? */
965
if(proc->completed and proc->eof){
852
if(proc->eof and proc->completed){
966
853
/* Only accept the plugin output if it exited cleanly */
967
854
if(not WIFEXITED(proc->status)
968
855
or WEXITSTATUS(proc->status) != 0){
969
856
/* Bad exit by plugin */
972
858
if(WIFEXITED(proc->status)){
973
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
974
" status %d\n", proc->name,
975
(intmax_t) (proc->pid),
859
fprintf(stderr, "Plugin %u exited with status %d\n",
860
(unsigned int) (proc->pid),
976
861
WEXITSTATUS(proc->status));
977
} else if(WIFSIGNALED(proc->status)){
978
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
979
" signal %d\n", proc->name,
980
(intmax_t) (proc->pid),
862
} else if(WIFSIGNALED(proc->status)) {
863
fprintf(stderr, "Plugin %u killed by signal %d\n",
864
(unsigned int) (proc->pid),
981
865
WTERMSIG(proc->status));
982
866
} else if(WCOREDUMP(proc->status)){
983
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
984
" core\n", proc->name, (intmax_t) (proc->pid));
867
fprintf(stderr, "Plugin %d dumped core\n",
868
(unsigned int) (proc->pid));
988
871
/* Remove the plugin */
989
872
FD_CLR(proc->fd, &rfds_all);
991
873
/* Block signal while modifying process_list */
992
874
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
995
877
exitstatus = EXIT_FAILURE;
999
plugin *next_plugin = proc->next;
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;
1003
893
/* We are done modifying process list, so unblock signal */
1004
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
894
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
1007
897
perror("sigprocmask");
1008
exitstatus = EXIT_FAILURE;
1012
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
1019
906
/* This process exited nicely, so print its buffer */
1021
908
bool bret = print_out_password(proc->buffer,
1022
909
proc->buffer_length);
1067
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
951
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1068
952
/* Fallback if all plugins failed, none are found or an error
1071
955
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1072
956
char *passwordbuffer = getpass("Password: ");
1073
size_t len = strlen(passwordbuffer);
1074
/* Strip trailing newline */
1075
if(len > 0 and passwordbuffer[len-1] == '\n'){
1076
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1079
bret = print_out_password(passwordbuffer, len);
957
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1081
959
perror("print_out_password");
1082
960
exitstatus = EXIT_FAILURE;
1089
967
perror("sigaction");
1090
968
exitstatus = EXIT_FAILURE;
1093
971
if(custom_argv != NULL){
1094
972
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1097
975
free(custom_argv);
977
free_plugin_list(plugin_list);
1100
979
if(dir != NULL){
1104
/* Kill the processes */
1105
for(plugin *p = plugin_list; p != NULL; p = p->next){
1108
ret = kill(p->pid, SIGTERM);
1109
if(ret == -1 and errno != ESRCH){
1110
/* Set-uid proccesses might not get closed */
983
/* Free the process list and kill the processes */
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);
1116
996
/* Wait for any remaining child processes to terminate */