3
3
* Mandos plugin runner - Run Mandos plugins
5
* Copyright © 2008 Teddy Hogeborn
6
* Copyright © 2008 Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
8
8
* This program is free software: you can redistribute it and/or
9
9
* modify it under the terms of the GNU General Public License as
62
62
#include <signal.h> /* struct sigaction, sigemptyset(),
63
63
sigaddset(), sigaction(),
64
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
SIG_UNBLOCK, kill() */
65
SIG_UNBLOCK, kill(), sig_atomic_t
66
67
#include <errno.h> /* errno, EBADF */
68
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
68
70
#define BUFFER_SIZE 256
99
101
or if none is found, creates a new one */
100
102
static plugin *getplugin(char *name){
101
103
/* Check for exiting plugin with that name */
102
for (plugin *p = plugin_list; p != NULL; p = p->next){
103
if ((p->name == name)
104
or (p->name and name and (strcmp(p->name, name) == 0))){
104
for(plugin *p = plugin_list; p != NULL; p = p->next){
106
or (p->name and name and (strcmp(p->name, name) == 0))){
108
110
/* Create a new plugin */
109
111
plugin *new_plugin = malloc(sizeof(plugin));
110
if (new_plugin == NULL){
112
if(new_plugin == NULL){
113
115
char *copy_name = NULL;
114
116
if(name != NULL){
115
117
copy_name = strdup(name);
116
118
if(copy_name == NULL){
121
*new_plugin = (plugin) { .name = copy_name,
124
.next = plugin_list };
124
*new_plugin = (plugin){ .name = copy_name,
127
.next = plugin_list };
126
129
new_plugin->argv = malloc(sizeof(char *) * 2);
127
if (new_plugin->argv == NULL){
130
if(new_plugin->argv == NULL){
129
132
free(new_plugin);
374
error_t parse_opt (int key, char *arg, __attribute__((unused))
375
struct argp_state *state) {
381
error_t parse_opt(int key, char *arg, __attribute__((unused))
382
struct argp_state *state){
377
384
case 'g': /* --global-options */
380
while((p = strsep(&arg, ",")) != NULL){
387
while((plugin_option = strsep(&arg, ",")) != NULL){
388
if(plugin_option[0] == '\0'){
384
if(not add_argument(getplugin(NULL), p)){
391
if(not add_argument(getplugin(NULL), plugin_option)){
385
392
perror("add_argument");
386
393
return ARGP_ERR_UNKNOWN;
399
406
case 'o': /* --options-for */
401
char *p_name = strsep(&arg, ":");
402
if(p_name[0] == '\0' or arg == NULL){
405
char *opt = strsep(&arg, ":");
406
if(opt[0] == '\0' or opt == NULL){
410
while((p = strsep(&opt, ",")) != NULL){
414
if(not add_argument(getplugin(p_name), p)){
408
char *plugin_name = strsep(&arg, ":");
409
if(plugin_name[0] == '\0'){
413
while((plugin_option = strsep(&arg, ",")) != NULL){
414
if(not add_argument(getplugin(plugin_name), plugin_option)){
415
415
perror("add_argument");
416
416
return ARGP_ERR_UNKNOWN;
462
462
/* This is already done by parse_opt_config_file() */
464
464
case 130: /* --userid */
465
uid = (uid_t)strtol(arg, NULL, 10);
465
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
466
if(ret < 1 or tmpmax != (uid_t)tmpmax
467
or arg[numchars] != '\0'){
468
fprintf(stderr, "Bad user ID number: \"%s\", using %"
469
PRIdMAX "\n", arg, (intmax_t)uid);
467
474
case 131: /* --groupid */
468
gid = (gid_t)strtol(arg, NULL, 10);
475
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
476
if(ret < 1 or tmpmax != (gid_t)tmpmax
477
or arg[numchars] != '\0'){
478
fprintf(stderr, "Bad group ID number: \"%s\", using %"
479
PRIdMAX "\n", arg, (intmax_t)gid);
470
484
case 132: /* --debug */
488
* When adding more options before this line, remember to also add a
489
* "case" to the "parse_opt_config_file" function below.
473
491
case ARGP_KEY_ARG:
474
492
/* Cryptsetup always passes an argument, which is an empty
475
493
string if "none" was specified in /etc/crypttab. So if
489
507
/* This option parser is the same as parse_opt() above, except it
490
508
ignores everything but the --config-file option. */
491
error_t parse_opt_config_file (int key, char *arg,
492
__attribute__((unused))
493
struct argp_state *state) {
509
error_t parse_opt_config_file(int key, char *arg,
510
__attribute__((unused))
511
struct argp_state *state){
495
513
case 'g': /* --global-options */
496
514
case 'G': /* --global-env */
497
515
case 'o': /* --options-for */
525
543
.doc = "Mandos plugin runner -- Run plugins" };
527
/* Parse using the parse_opt_config_file in order to get the custom
545
/* Parse using parse_opt_config_file() in order to get the custom
528
546
config file location, if any. */
529
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
530
if (ret == ARGP_ERR_UNKNOWN){
547
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
548
if(ret == ARGP_ERR_UNKNOWN){
531
549
fprintf(stderr, "Unknown error while parsing arguments\n");
532
550
exitstatus = EXIT_FAILURE;
546
564
char *org_line = NULL;
547
565
char *p, *arg, *new_arg, *line;
550
567
const char whitespace_delims[] = " \r\t\f\v\n";
551
568
const char comment_delim[] = "#";
600
617
/* Check for harmful errors and go to fallback. Other errors might
601
618
not affect opening plugins */
602
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
619
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
604
621
exitstatus = EXIT_FAILURE;
608
625
/* If there was any arguments from configuration file,
609
626
pass them to parser as command arguments */
610
627
if(custom_argv != NULL){
611
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
613
if (ret == ARGP_ERR_UNKNOWN){
628
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
630
if(ret == ARGP_ERR_UNKNOWN){
614
631
fprintf(stderr, "Unknown error while parsing arguments\n");
615
632
exitstatus = EXIT_FAILURE;
620
637
/* Parse actual command line arguments, to let them override the
622
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
623
if (ret == ARGP_ERR_UNKNOWN){
639
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
640
if(ret == ARGP_ERR_UNKNOWN){
624
641
fprintf(stderr, "Unknown error while parsing arguments\n");
625
642
exitstatus = EXIT_FAILURE;
633
650
for(char **a = p->argv; *a != NULL; a++){
634
651
fprintf(stderr, "\tArg: %s\n", *a);
636
fprintf(stderr, "...and %u environment variables\n", p->envc);
653
fprintf(stderr, "...and %d environment variables\n", p->envc);
637
654
for(char **a = p->environ; *a != NULL; a++){
638
655
fprintf(stderr, "\t%s\n", *a);
751
768
ret = stat(filename, &st);
758
775
/* Ignore non-executable files */
759
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
776
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
761
778
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
762
779
" with bad type or mode\n", filename);
830
847
/* Block SIGCHLD until process is safely in process list */
831
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
848
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
833
850
perror("sigprocmask");
834
851
exitstatus = EXIT_FAILURE;
882
899
close(pipefd[1]); /* Close unused write end of pipe */
884
901
plugin *new_plugin = getplugin(dirst->d_name);
885
if (new_plugin == NULL){
902
if(new_plugin == NULL){
886
903
perror("getplugin");
887
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
904
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
889
906
perror("sigprocmask");
898
915
/* Unblock SIGCHLD so signal handler can be run if this process
899
916
has already completed */
900
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
917
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
902
919
perror("sigprocmask");
903
920
exitstatus = EXIT_FAILURE;
907
924
FD_SET(new_plugin->fd, &rfds_all);
909
if (maxfd < new_plugin->fd){
926
if(maxfd < new_plugin->fd){
910
927
maxfd = new_plugin->fd;
933
free_plugin(getplugin(NULL));
917
935
for(plugin *p = plugin_list; p != NULL; p = p->next){
938
956
from one of them */
939
957
for(plugin *proc = plugin_list; proc != NULL;){
940
958
/* Is this process completely done? */
941
if(proc->eof and proc->completed){
959
if(proc->completed and proc->eof){
942
960
/* Only accept the plugin output if it exited cleanly */
943
961
if(not WIFEXITED(proc->status)
944
962
or WEXITSTATUS(proc->status) != 0){
948
966
if(WIFEXITED(proc->status)){
949
fprintf(stderr, "Plugin %u exited with status %d\n",
950
(unsigned int) (proc->pid),
967
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
968
" status %d\n", proc->name,
969
(intmax_t) (proc->pid),
951
970
WEXITSTATUS(proc->status));
952
} else if(WIFSIGNALED(proc->status)) {
953
fprintf(stderr, "Plugin %u killed by signal %d\n",
954
(unsigned int) (proc->pid),
971
} else if(WIFSIGNALED(proc->status)){
972
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
973
" signal %d\n", proc->name,
974
(intmax_t) (proc->pid),
955
975
WTERMSIG(proc->status));
956
976
} else if(WCOREDUMP(proc->status)){
957
fprintf(stderr, "Plugin %d dumped core\n",
958
(unsigned int) (proc->pid));
977
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
978
" core\n", proc->name, (intmax_t) (proc->pid));
975
995
proc = next_plugin;
977
997
/* We are done modifying process list, so unblock signal */
978
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
998
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
981
1001
perror("sigprocmask");
982
1002
exitstatus = EXIT_FAILURE;
1011
1031
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1012
1032
proc->buffer = realloc(proc->buffer, proc->buffer_size
1013
1033
+ (size_t) BUFFER_SIZE);
1014
if (proc->buffer == NULL){
1034
if(proc->buffer == NULL){
1015
1035
perror("malloc");
1016
1036
exitstatus = EXIT_FAILURE;
1019
1039
proc->buffer_size += BUFFER_SIZE;
1021
1041
/* Read from the process */
1022
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1042
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1025
1045
/* Read error from this process; ignore the error */
1026
1046
proc = proc->next;
1031
1051
proc->eof = true;
1033
proc->buffer_length += (size_t) ret;
1053
proc->buffer_length += (size_t) sret;