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,
82
92
volatile bool completed;
83
93
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 *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
123
*new_plugin = (plugin) { .name = copy_name,
120
125
.disabled = false,
121
.next = *plugin_list };
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){
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/* 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
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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);
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214
/* If reading the flags failed, return error indication now. */
250
static void free_plugin_list(plugin *plugin_list){
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for(plugin *next; plugin_list != NULL; plugin_list = next){
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next = plugin_list->next;
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for(char **arg = plugin_list->argv; *arg != NULL; arg++){
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free(plugin_list->argv);
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for(char **env = plugin_list->environ; *env != NULL; env++){
260
free(plugin_list->environ);
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/* 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);
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for(char **env = plugin_node->environ; *env != NULL; env++){
278
free(plugin_node->environ);
279
free(plugin_node->buffer);
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/* 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);
265
304
int main(int argc, char *argv[]){
266
const char *plugindir = "/lib/mandos/plugins.d";
267
const char *argfile = ARGFILE;
305
char *plugindir = NULL;
306
char *argfile = NULL;
269
308
size_t d_name_len;
271
310
struct dirent *dirst;
313
int ret, numchars, maxfd = 0;
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316
uid_t uid = 65534;
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317
gid_t gid = 65534;
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318
bool debug = false;
302
343
{ .name = "global-options", .key = 'g',
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344
.arg = "OPTION[,OPTION[,...]]",
304
345
.doc = "Options passed to all plugins" },
305
{ .name = "global-envs", .key = 'e',
346
{ .name = "global-env", .key = 'G',
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347
.arg = "VAR=value",
307
348
.doc = "Environment variable passed to all plugins" },
308
349
{ .name = "options-for", .key = 'o',
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350
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
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351
.doc = "Options passed only to specified plugin" },
311
{ .name = "envs-for", .key = 'f',
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{ .name = "env-for", .key = 'E',
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353
.arg = "PLUGIN:ENV=value",
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354
.doc = "Environment variable passed to specified plugin" },
314
355
{ .name = "disable", .key = 'd',
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357
.doc = "Disable a specific plugin", .group = 1 },
358
{ .name = "enable", .key = 'e',
360
.doc = "Enable a specific plugin", .group = 1 },
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361
{ .name = "plugin-dir", .key = 128,
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362
.arg = "DIRECTORY",
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363
.doc = "Specify a different plugin directory", .group = 2 },
320
{ .name = "userid", .key = 129,
321
.arg = "ID", .flags = 0,
322
.doc = "User ID the plugins will run as", .group = 2 },
323
{ .name = "groupid", .key = 130,
324
.arg = "ID", .flags = 0,
325
.doc = "Group ID the plugins will run as", .group = 2 },
326
{ .name = "debug", .key = 131,
327
.doc = "Debug mode", .group = 3 },
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,
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.doc = "Debug mode", .group = 4 },
331
error_t parse_opt (int key, char *arg, struct argp_state *state) {
332
/* Get the INPUT argument from `argp_parse', which we know is a
333
pointer to our plugin list pointer. */
334
plugin **plugins = state->input;
378
error_t parse_opt(int key, char *arg, __attribute__((unused))
379
struct argp_state *state) {
381
case 'g': /* --global-options */
339
384
while((p = strsep(&arg, ",")) != NULL){
340
385
if(p[0] == '\0'){
343
if(not add_argument(getplugin(NULL, plugins), p)){
388
if(not add_argument(getplugin(NULL), p)){
344
389
perror("add_argument");
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390
return ARGP_ERR_UNKNOWN;
395
case 'G': /* --global-env */
355
char *envdef = strdup(arg);
359
if(not add_environment(getplugin(NULL, plugins), envdef)){
360
perror("add_environment");
399
if(not add_environment(getplugin(NULL), arg, true)){
400
perror("add_environment");
403
case 'o': /* --options-for */
366
405
char *p_name = strsep(&arg, ":");
367
if(p_name[0] == '\0'){
406
if(p_name[0] == '\0' or arg == NULL){
370
409
char *opt = strsep(&arg, ":");
410
if(opt[0] == '\0' or opt == NULL){
376
while((p = strsep(&opt, ",")) != NULL){
380
if(not add_argument(getplugin(p_name, plugins), p)){
381
perror("add_argument");
382
return ARGP_ERR_UNKNOWN;
414
while((p = strsep(&opt, ",")) != NULL){
418
if(not add_argument(getplugin(p_name), p)){
419
perror("add_argument");
420
return ARGP_ERR_UNKNOWN;
425
case 'E': /* --env-for */
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431
if(envdef == NULL){
397
char *p_name = strndup(arg, (size_t) (envdef-arg));
402
if(not add_environment(getplugin(p_name, plugins), envdef)){
435
if(not add_environment(getplugin(arg), envdef+1, true)){
403
436
perror("add_environment");
409
plugin *p = getplugin(arg, plugins);
440
case 'd': /* --disable */
442
plugin *p = getplugin(arg);
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444
return ARGP_ERR_UNKNOWN;
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446
p->disabled = true;
420
uid = (uid_t)strtol(arg, NULL, 10);
423
gid = (gid_t)strtol(arg, NULL, 10);
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 */
429
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
434
return ARGP_ERR_UNKNOWN;
439
plugin *plugin_list = NULL;
441
struct argp argp = { .options = options, .parser = parse_opt,
442
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
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,
443
547
.doc = "Mandos plugin runner -- Run plugins" };
445
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
446
if (ret == ARGP_ERR_UNKNOWN){
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){
447
553
fprintf(stderr, "Unknown error while parsing arguments\n");
448
554
exitstatus = EXIT_FAILURE;
452
conffp = fopen(argfile, "r");
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");
453
567
if(conffp != NULL){
454
568
char *org_line = NULL;
455
569
char *p, *arg, *new_arg, *line;
458
571
const char whitespace_delims[] = " \r\t\f\v\n";
459
572
const char comment_delim[] = "#";
500
621
/* Check for harmful errors and go to fallback. Other errors might
501
622
not affect opening plugins */
502
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
623
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
504
625
exitstatus = EXIT_FAILURE;
629
/* If there was any arguments from configuration file,
630
pass them to parser as command arguments */
509
631
if(custom_argv != NULL){
510
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
511
if (ret == ARGP_ERR_UNKNOWN){
632
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
634
if(ret == ARGP_ERR_UNKNOWN){
512
635
fprintf(stderr, "Unknown error while parsing arguments\n");
513
636
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;
519
651
for(plugin *p = plugin_list; p != NULL; p=p->next){
520
652
fprintf(stderr, "Plugin: %s has %d arguments\n",
903
close(pipefd[1]); /* Close unused write end of pipe */
765
close(pipefd[1]); /* close unused write end of pipe */
766
process *new_process = malloc(sizeof(process));
767
if (new_process == NULL){
769
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
905
plugin *new_plugin = getplugin(dirst->d_name);
906
if(new_plugin == NULL){
908
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
771
perror("sigprocmask");
910
perror("sigprocmask");
773
912
exitstatus = EXIT_FAILURE;
777
*new_process = (struct process){ .pid = pid,
779
.next = process_list };
781
process_list = new_process;
916
new_plugin->pid = pid;
917
new_plugin->fd = pipefd[0];
782
919
/* Unblock SIGCHLD so signal handler can be run if this process
783
920
has already completed */
784
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
921
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
786
923
perror("sigprocmask");
787
924
exitstatus = EXIT_FAILURE;
791
FD_SET(new_process->fd, &rfds_all);
928
FD_SET(new_plugin->fd, &rfds_all);
793
if (maxfd < new_process->fd){
794
maxfd = new_process->fd;
930
if(maxfd < new_plugin->fd){
931
maxfd = new_plugin->fd;
799
free_plugin_list(plugin_list);
805
if (process_list == NULL){
806
fprintf(stderr, "No plugin processes started. Incorrect plugin"
938
for(plugin *p = plugin_list; p != NULL; p = p->next){
943
fprintf(stderr, "No plugin processes started. Incorrect plugin"
949
/* Main loop while running plugins exist */
811
951
fd_set rfds = rfds_all;
812
952
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
813
if (select_ret == -1){
953
if(select_ret == -1){
814
954
perror("select");
815
955
exitstatus = EXIT_FAILURE;
818
958
/* OK, now either a process completed, or something can be read
819
959
from one of them */
820
for(process *proc = process_list; proc ; proc = proc->next){
960
for(plugin *proc = plugin_list; proc != NULL;){
821
961
/* Is this process completely done? */
822
962
if(proc->eof and proc->completed){
823
963
/* Only accept the plugin output if it exited cleanly */
824
964
if(not WIFEXITED(proc->status)
825
965
or WEXITSTATUS(proc->status) != 0){
826
966
/* Bad exit by plugin */
828
969
if(WIFEXITED(proc->status)){
829
fprintf(stderr, "Plugin %u exited with status %d\n",
830
(unsigned int) (proc->pid),
970
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
971
" %d\n", (intmax_t) (proc->pid),
831
972
WEXITSTATUS(proc->status));
832
973
} else if(WIFSIGNALED(proc->status)) {
833
fprintf(stderr, "Plugin %u killed by signal %d\n",
834
(unsigned int) (proc->pid),
974
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
975
" %d\n", (intmax_t) (proc->pid),
835
976
WTERMSIG(proc->status));
836
977
} else if(WCOREDUMP(proc->status)){
837
fprintf(stderr, "Plugin %d dumped core\n",
838
(unsigned int) (proc->pid));
978
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
979
(intmax_t) (proc->pid));
841
983
/* Remove the plugin */
842
984
FD_CLR(proc->fd, &rfds_all);
843
986
/* Block signal while modifying process_list */
844
987
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
847
990
exitstatus = EXIT_FAILURE;
850
/* Delete this process entry from the list */
851
if(process_list == proc){
852
/* First one - simple */
853
process_list = proc->next;
855
/* Second one or later */
856
for(process *p = process_list; p != NULL; p = p->next){
858
p->next = proc->next;
994
plugin *next_plugin = proc->next;
863
998
/* We are done modifying process list, so unblock signal */
864
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
999
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
867
1002
perror("sigprocmask");
871
/* We deleted this process from the list, so we can't go
872
proc->next. Therefore, start over from the beginning of
1003
exitstatus = EXIT_FAILURE;
1007
if(plugin_list == NULL){
876
1014
/* This process exited nicely, so print its buffer */
878
1016
bool bret = print_out_password(proc->buffer,
879
1017
proc->buffer_length);
937
1084
perror("sigaction");
938
1085
exitstatus = EXIT_FAILURE;
941
1088
if(custom_argv != NULL){
942
1089
for(char **arg = custom_argv+1; *arg != NULL; arg++){
945
1092
free(custom_argv);
947
free_plugin_list(plugin_list);
949
1095
if(dir != NULL){
953
/* Free the process list and kill the processes */
954
for(process *next; process_list != NULL; process_list = next){
955
next = process_list->next;
956
close(process_list->fd);
957
ret = kill(process_list->pid, SIGTERM);
958
if(ret == -1 and errno != ESRCH){
959
/* set-uid proccesses migth not get closed */
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 */
962
free(process_list->buffer);
966
1111
/* Wait for any remaining child processes to terminate */