3
3
* Mandos plugin runner - Run Mandos plugins
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
5
* Copyright © 2008 Teddy Hogeborn
6
* Copyright © 2008 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(), sig_atomic_t
65
SIG_UNBLOCK, kill() */
67
66
#include <errno.h> /* errno, EBADF */
68
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
70
68
#define BUFFER_SIZE 256
101
99
or if none is found, creates a new one */
102
100
static plugin *getplugin(char *name){
103
101
/* Check for exiting plugin with that name */
104
for(plugin *p = plugin_list; p != NULL; p = p->next){
106
or (p->name and name and (strcmp(p->name, name) == 0))){
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))){
110
108
/* Create a new plugin */
111
109
plugin *new_plugin = malloc(sizeof(plugin));
112
if(new_plugin == NULL){
110
if (new_plugin == NULL){
115
113
char *copy_name = NULL;
116
114
if(name != NULL){
117
115
copy_name = strdup(name);
118
116
if(copy_name == NULL){
124
*new_plugin = (plugin){ .name = copy_name,
127
.next = plugin_list };
121
*new_plugin = (plugin) { .name = copy_name,
124
.next = plugin_list };
129
126
new_plugin->argv = malloc(sizeof(char *) * 2);
130
if(new_plugin->argv == NULL){
127
if (new_plugin->argv == NULL){
132
129
free(new_plugin);
381
error_t parse_opt(int key, char *arg, __attribute__((unused))
382
struct argp_state *state){
374
error_t parse_opt (int key, char *arg, __attribute__((unused))
375
struct argp_state *state) {
385
377
case 'g': /* --global-options */
388
while((plugin_option = strsep(&arg, ",")) != NULL){
389
if(plugin_option[0] == '\0'){
380
while((p = strsep(&arg, ",")) != NULL){
392
if(not add_argument(getplugin(NULL), plugin_option)){
384
if(not add_argument(getplugin(NULL), p)){
393
385
perror("add_argument");
394
386
return ARGP_ERR_UNKNOWN;
407
399
case 'o': /* --options-for */
409
char *plugin_name = strsep(&arg, ":");
410
if(plugin_name[0] == '\0'){
414
while((plugin_option = strsep(&arg, ",")) != NULL){
415
if(not add_argument(getplugin(plugin_name), plugin_option)){
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)){
416
415
perror("add_argument");
417
416
return ARGP_ERR_UNKNOWN;
463
462
/* This is already done by parse_opt_config_file() */
465
464
case 130: /* --userid */
467
tmpmax = strtoimax(arg, &tmp, 10);
468
if(errno != 0 or tmp == arg or *tmp != '\0'
469
or tmpmax != (uid_t)tmpmax){
470
fprintf(stderr, "Bad user ID number: \"%s\", using %"
471
PRIdMAX "\n", arg, (intmax_t)uid);
465
uid = (uid_t)strtol(arg, NULL, 10);
476
467
case 131: /* --groupid */
478
tmpmax = strtoimax(arg, &tmp, 10);
479
if(errno != 0 or tmp == arg or *tmp != '\0'
480
or tmpmax != (gid_t)tmpmax){
481
fprintf(stderr, "Bad group ID number: \"%s\", using %"
482
PRIdMAX "\n", arg, (intmax_t)gid);
468
gid = (gid_t)strtol(arg, NULL, 10);
487
470
case 132: /* --debug */
491
* When adding more options before this line, remember to also add a
492
* "case" to the "parse_opt_config_file" function below.
494
473
case ARGP_KEY_ARG:
495
474
/* Cryptsetup always passes an argument, which is an empty
496
475
string if "none" was specified in /etc/crypttab. So if
510
489
/* This option parser is the same as parse_opt() above, except it
511
490
ignores everything but the --config-file option. */
512
error_t parse_opt_config_file(int key, char *arg,
513
__attribute__((unused))
514
struct argp_state *state){
491
error_t parse_opt_config_file (int key, char *arg,
492
__attribute__((unused))
493
struct argp_state *state) {
516
495
case 'g': /* --global-options */
517
496
case 'G': /* --global-env */
518
497
case 'o': /* --options-for */
546
525
.doc = "Mandos plugin runner -- Run plugins" };
548
/* Parse using parse_opt_config_file() in order to get the custom
527
/* Parse using the parse_opt_config_file in order to get the custom
549
528
config file location, if any. */
550
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
551
if(ret == ARGP_ERR_UNKNOWN){
529
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
530
if (ret == ARGP_ERR_UNKNOWN){
552
531
fprintf(stderr, "Unknown error while parsing arguments\n");
553
532
exitstatus = EXIT_FAILURE;
567
546
char *org_line = NULL;
568
547
char *p, *arg, *new_arg, *line;
570
550
const char whitespace_delims[] = " \r\t\f\v\n";
571
551
const char comment_delim[] = "#";
574
554
custom_argv = malloc(sizeof(char*) * 2);
575
555
if(custom_argv == NULL){
620
600
/* Check for harmful errors and go to fallback. Other errors might
621
601
not affect opening plugins */
622
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
602
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
624
604
exitstatus = EXIT_FAILURE;
628
608
/* If there was any arguments from configuration file,
629
609
pass them to parser as command arguments */
630
610
if(custom_argv != NULL){
631
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
633
if(ret == ARGP_ERR_UNKNOWN){
611
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
613
if (ret == ARGP_ERR_UNKNOWN){
634
614
fprintf(stderr, "Unknown error while parsing arguments\n");
635
615
exitstatus = EXIT_FAILURE;
640
620
/* Parse actual command line arguments, to let them override the
642
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
643
if(ret == ARGP_ERR_UNKNOWN){
622
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
623
if (ret == ARGP_ERR_UNKNOWN){
644
624
fprintf(stderr, "Unknown error while parsing arguments\n");
645
625
exitstatus = EXIT_FAILURE;
653
633
for(char **a = p->argv; *a != NULL; a++){
654
634
fprintf(stderr, "\tArg: %s\n", *a);
656
fprintf(stderr, "...and %d environment variables\n", p->envc);
636
fprintf(stderr, "...and %u environment variables\n", p->envc);
657
637
for(char **a = p->environ; *a != NULL; a++){
658
638
fprintf(stderr, "\t%s\n", *a);
771
751
ret = stat(filename, &st);
778
758
/* Ignore non-executable files */
779
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
759
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
781
761
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
782
762
" with bad type or mode\n", filename);
850
830
/* Block SIGCHLD until process is safely in process list */
851
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
831
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
853
833
perror("sigprocmask");
854
834
exitstatus = EXIT_FAILURE;
902
882
close(pipefd[1]); /* Close unused write end of pipe */
904
884
plugin *new_plugin = getplugin(dirst->d_name);
905
if(new_plugin == NULL){
885
if (new_plugin == NULL){
906
886
perror("getplugin");
907
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
887
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
909
889
perror("sigprocmask");
918
898
/* Unblock SIGCHLD so signal handler can be run if this process
919
899
has already completed */
920
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
900
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
922
902
perror("sigprocmask");
923
903
exitstatus = EXIT_FAILURE;
927
907
FD_SET(new_plugin->fd, &rfds_all);
929
if(maxfd < new_plugin->fd){
909
if (maxfd < new_plugin->fd){
930
910
maxfd = new_plugin->fd;
936
free_plugin(getplugin(NULL));
938
917
for(plugin *p = plugin_list; p != NULL; p = p->next){
959
938
from one of them */
960
939
for(plugin *proc = plugin_list; proc != NULL;){
961
940
/* Is this process completely done? */
962
if(proc->completed and proc->eof){
941
if(proc->eof and proc->completed){
963
942
/* Only accept the plugin output if it exited cleanly */
964
943
if(not WIFEXITED(proc->status)
965
944
or WEXITSTATUS(proc->status) != 0){
966
945
/* Bad exit by plugin */
969
948
if(WIFEXITED(proc->status)){
970
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
971
" status %d\n", proc->name,
972
(intmax_t) (proc->pid),
949
fprintf(stderr, "Plugin %u exited with status %d\n",
950
(unsigned int) (proc->pid),
973
951
WEXITSTATUS(proc->status));
974
} else if(WIFSIGNALED(proc->status)){
975
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
976
" signal %d\n", proc->name,
977
(intmax_t) (proc->pid),
952
} else if(WIFSIGNALED(proc->status)) {
953
fprintf(stderr, "Plugin %u killed by signal %d\n",
954
(unsigned int) (proc->pid),
978
955
WTERMSIG(proc->status));
979
956
} else if(WCOREDUMP(proc->status)){
980
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
981
" core\n", proc->name, (intmax_t) (proc->pid));
957
fprintf(stderr, "Plugin %d dumped core\n",
958
(unsigned int) (proc->pid));
985
962
/* Remove the plugin */
986
963
FD_CLR(proc->fd, &rfds_all);
988
965
/* Block signal while modifying process_list */
989
966
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
998
975
proc = next_plugin;
1000
977
/* We are done modifying process list, so unblock signal */
1001
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
978
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
1004
981
perror("sigprocmask");
1005
982
exitstatus = EXIT_FAILURE;
1034
1011
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1035
1012
proc->buffer = realloc(proc->buffer, proc->buffer_size
1036
1013
+ (size_t) BUFFER_SIZE);
1037
if(proc->buffer == NULL){
1014
if (proc->buffer == NULL){
1038
1015
perror("malloc");
1039
1016
exitstatus = EXIT_FAILURE;
1042
1019
proc->buffer_size += BUFFER_SIZE;
1044
1021
/* Read from the process */
1045
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1022
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1048
1025
/* Read error from this process; ignore the error */
1049
1026
proc = proc->next;
1054
1031
proc->eof = true;
1056
proc->buffer_length += (size_t) sret;
1033
proc->buffer_length += (size_t) ret;
1064
1041
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){