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 & Björn Påhlsson
8
7
* This program is free software: you can redistribute it and/or
9
8
* modify it under the terms of the GNU General Public License as
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
75
typedef struct plugin{
100
98
or if none is found, creates a new one */
101
99
static plugin *getplugin(char *name){
102
100
/* 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))){
101
for (plugin *p = plugin_list; p != NULL; p = p->next){
102
if ((p->name == name)
103
or (p->name and name and (strcmp(p->name, name) == 0))){
109
107
/* Create a new plugin */
110
108
plugin *new_plugin = malloc(sizeof(plugin));
111
if(new_plugin == NULL){
109
if (new_plugin == NULL){
114
112
char *copy_name = NULL;
115
113
if(name != NULL){
116
114
copy_name = strdup(name);
117
115
if(copy_name == NULL){
123
*new_plugin = (plugin){ .name = copy_name,
126
.next = plugin_list };
120
*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);
380
error_t parse_opt(int key, char *arg, __attribute__((unused))
381
struct argp_state *state){
373
error_t parse_opt (int key, char *arg, __attribute__((unused))
374
struct argp_state *state) {
383
376
case 'g': /* --global-options */
386
379
while((p = strsep(&arg, ",")) != NULL){
387
380
if(p[0] == '\0'){
468
461
/* This is already done by parse_opt_config_file() */
470
463
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);
464
uid = (uid_t)strtol(arg, NULL, 10);
480
466
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);
467
gid = (gid_t)strtol(arg, NULL, 10);
490
469
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.
497
472
case ARGP_KEY_ARG:
498
473
/* Cryptsetup always passes an argument, which is an empty
499
474
string if "none" was specified in /etc/crypttab. So if
513
488
/* This option parser is the same as parse_opt() above, except it
514
489
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){
490
error_t parse_opt_config_file (int key, char *arg,
491
__attribute__((unused))
492
struct argp_state *state) {
519
494
case 'g': /* --global-options */
520
495
case 'G': /* --global-env */
521
496
case 'o': /* --options-for */
549
524
.doc = "Mandos plugin runner -- Run plugins" };
551
/* Parse using parse_opt_config_file() in order to get the custom
526
/* Parse using the parse_opt_config_file in order to get the custom
552
527
config file location, if any. */
553
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
554
if(ret == ARGP_ERR_UNKNOWN){
528
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
529
if (ret == ARGP_ERR_UNKNOWN){
555
530
fprintf(stderr, "Unknown error while parsing arguments\n");
556
531
exitstatus = EXIT_FAILURE;
570
545
char *org_line = NULL;
571
546
char *p, *arg, *new_arg, *line;
573
549
const char whitespace_delims[] = " \r\t\f\v\n";
574
550
const char comment_delim[] = "#";
623
599
/* Check for harmful errors and go to fallback. Other errors might
624
600
not affect opening plugins */
625
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
601
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
627
603
exitstatus = EXIT_FAILURE;
631
607
/* If there was any arguments from configuration file,
632
608
pass them to parser as command arguments */
633
609
if(custom_argv != NULL){
634
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
636
if(ret == ARGP_ERR_UNKNOWN){
610
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
612
if (ret == ARGP_ERR_UNKNOWN){
637
613
fprintf(stderr, "Unknown error while parsing arguments\n");
638
614
exitstatus = EXIT_FAILURE;
643
619
/* 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){
621
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
622
if (ret == ARGP_ERR_UNKNOWN){
647
623
fprintf(stderr, "Unknown error while parsing arguments\n");
648
624
exitstatus = EXIT_FAILURE;
656
632
for(char **a = p->argv; *a != NULL; a++){
657
633
fprintf(stderr, "\tArg: %s\n", *a);
659
fprintf(stderr, "...and %d environment variables\n", p->envc);
635
fprintf(stderr, "...and %u environment variables\n", p->envc);
660
636
for(char **a = p->environ; *a != NULL; a++){
661
637
fprintf(stderr, "\t%s\n", *a);
725
701
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
728
703
".dpkg-divert", NULL };
729
704
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
730
705
size_t pre_len = strlen(*pre);
774
749
ret = stat(filename, &st);
781
756
/* Ignore non-executable files */
782
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
757
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
784
759
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
785
760
" with bad type or mode\n", filename);
853
828
/* Block SIGCHLD until process is safely in process list */
854
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
829
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
856
831
perror("sigprocmask");
857
832
exitstatus = EXIT_FAILURE;
871
846
perror("sigaction");
872
847
_exit(EXIT_FAILURE);
874
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
849
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
876
851
perror("sigprocmask");
877
852
_exit(EXIT_FAILURE);
880
855
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
905
880
close(pipefd[1]); /* Close unused write end of pipe */
907
882
plugin *new_plugin = getplugin(dirst->d_name);
908
if(new_plugin == NULL){
883
if (new_plugin == NULL){
909
884
perror("getplugin");
910
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
885
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
912
887
perror("sigprocmask");
921
896
/* Unblock SIGCHLD so signal handler can be run if this process
922
897
has already completed */
923
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
898
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
925
900
perror("sigprocmask");
926
901
exitstatus = EXIT_FAILURE;
930
905
FD_SET(new_plugin->fd, &rfds_all);
932
if(maxfd < new_plugin->fd){
907
if (maxfd < new_plugin->fd){
933
908
maxfd = new_plugin->fd;
939
free_plugin(getplugin(NULL));
941
916
for(plugin *p = plugin_list; p != NULL; p = p->next){
948
923
free_plugin_list();
952
927
/* Main loop while running plugins exist */
953
928
while(plugin_list){
954
929
fd_set rfds = rfds_all;
955
930
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
956
if(select_ret == -1){
931
if (select_ret == -1){
957
932
perror("select");
958
933
exitstatus = EXIT_FAILURE;
962
937
from one of them */
963
938
for(plugin *proc = plugin_list; proc != NULL;){
964
939
/* Is this process completely done? */
965
if(proc->completed and proc->eof){
940
if(proc->eof and proc->completed){
966
941
/* Only accept the plugin output if it exited cleanly */
967
942
if(not WIFEXITED(proc->status)
968
943
or WEXITSTATUS(proc->status) != 0){
972
947
if(WIFEXITED(proc->status)){
973
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
974
" status %d\n", proc->name,
975
(intmax_t) (proc->pid),
948
fprintf(stderr, "Plugin %u exited with status %d\n",
949
(unsigned int) (proc->pid),
976
950
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),
951
} else if(WIFSIGNALED(proc->status)) {
952
fprintf(stderr, "Plugin %u killed by signal %d\n",
953
(unsigned int) (proc->pid),
981
954
WTERMSIG(proc->status));
982
955
} else if(WCOREDUMP(proc->status)){
983
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
984
" core\n", proc->name, (intmax_t) (proc->pid));
956
fprintf(stderr, "Plugin %d dumped core\n",
957
(unsigned int) (proc->pid));
972
/* We are done modifying process list, so unblock signal */
973
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
976
perror("sigprocmask");
977
exitstatus = EXIT_FAILURE;
981
if(plugin_list == NULL){
999
985
plugin *next_plugin = proc->next;
1000
986
free_plugin(proc);
1001
987
proc = next_plugin;
1003
/* We are done modifying process list, so unblock signal */
1004
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1007
perror("sigprocmask");
1008
exitstatus = EXIT_FAILURE;
1012
if(plugin_list == NULL){
1019
991
/* This process exited nicely, so print its buffer */
1021
993
bool bret = print_out_password(proc->buffer,
1022
994
proc->buffer_length);
1037
1009
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1038
1010
proc->buffer = realloc(proc->buffer, proc->buffer_size
1039
1011
+ (size_t) BUFFER_SIZE);
1040
if(proc->buffer == NULL){
1012
if (proc->buffer == NULL){
1041
1013
perror("malloc");
1042
1014
exitstatus = EXIT_FAILURE;
1045
1017
proc->buffer_size += BUFFER_SIZE;
1047
1019
/* Read from the process */
1048
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1020
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1051
1023
/* Read error from this process; ignore the error */
1052
1024
proc = proc->next;
1057
1029
proc->eof = true;
1059
proc->buffer_length += (size_t) sret;
1031
proc->buffer_length += (size_t) ret;