3
3
* Mandos plugin runner - Run Mandos plugins
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
7
8
* This program is free software: you can redistribute it and/or
8
9
* modify it under the terms of the GNU General Public License as
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,
46
47
fcntl(), setuid(), setgid(),
47
48
F_GETFD, F_SETFD, FD_CLOEXEC,
48
49
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
dup2(), STDOUT_FILENO, _exit(),
50
51
execv(), write(), read(),
52
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
63
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
65
SIG_UNBLOCK, kill() */
65
66
#include <errno.h> /* errno, EBADF */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
67
69
#define BUFFER_SIZE 256
69
71
#define PDIR "/lib/mandos/plugins.d"
70
72
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
72
const char *argp_program_version = "plugin-runner 1.0";
74
const char *argp_program_version = "plugin-runner " VERSION;
73
75
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
77
77
typedef struct plugin{
78
78
char *name; /* can be NULL or any plugin name */
100
100
or if none is found, creates a new one */
101
101
static plugin *getplugin(char *name){
102
102
/* Check for exiting plugin with that name */
103
for (plugin *p = plugin_list; p != NULL; p = p->next){
104
if ((p->name == name)
105
or (p->name and name and (strcmp(p->name, name) == 0))){
103
for(plugin *p = plugin_list; p != NULL; p = p->next){
105
or (p->name and name and (strcmp(p->name, name) == 0))){
109
109
/* Create a new plugin */
110
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
111
if(new_plugin == NULL){
114
114
char *copy_name = NULL;
115
115
if(name != NULL){
116
116
copy_name = strdup(name);
117
117
if(copy_name == NULL){
122
*new_plugin = (plugin) { .name = copy_name,
125
.next = plugin_list };
123
*new_plugin = (plugin){ .name = copy_name,
126
.next = plugin_list };
127
128
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if (new_plugin->argv == NULL){
129
if(new_plugin->argv == NULL){
130
131
free(new_plugin);
208
209
* Descriptor Flags".
209
210
* *Note File Descriptor Flags:(libc)Descriptor Flags.
211
static int set_cloexec_flag(int fd)
212
static int set_cloexec_flag(int fd){
213
213
int ret = fcntl(fd, F_GETFD, 0);
214
214
/* If reading the flags failed, return error indication now. */
223
223
/* Mark processes as completed when they exit, and save their exit
225
void handle_sigchld(__attribute__((unused)) int sig){
225
static void handle_sigchld(__attribute__((unused)) int sig){
226
int old_errno = errno;
227
228
plugin *proc = plugin_list;
250
251
proc->status = status;
251
proc->completed = true;
255
257
/* Prints out a password to stdout */
256
bool print_out_password(const char *buffer, size_t length){
258
static bool print_out_password(const char *buffer, size_t length){
258
260
for(size_t written = 0; written < length; written += (size_t)ret){
259
261
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
380
error_t parse_opt(int key, char *arg, __attribute__((unused))
381
struct argp_state *state){
379
383
case 'g': /* --global-options */
382
while((p = strsep(&arg, ",")) != NULL){
386
while((plugin_option = strsep(&arg, ",")) != NULL){
387
if(plugin_option[0] == '\0'){
386
if(not add_argument(getplugin(NULL), p)){
390
if(not add_argument(getplugin(NULL), plugin_option)){
387
391
perror("add_argument");
388
392
return ARGP_ERR_UNKNOWN;
401
405
case 'o': /* --options-for */
403
char *p_name = strsep(&arg, ":");
404
if(p_name[0] == '\0' or arg == NULL){
407
char *opt = strsep(&arg, ":");
408
if(opt[0] == '\0' or opt == NULL){
412
while((p = strsep(&opt, ",")) != NULL){
416
if(not add_argument(getplugin(p_name), p)){
407
char *plugin_name = strsep(&arg, ":");
408
if(plugin_name[0] == '\0'){
412
while((plugin_option = strsep(&arg, ",")) != NULL){
413
if(not add_argument(getplugin(plugin_name), plugin_option)){
417
414
perror("add_argument");
418
415
return ARGP_ERR_UNKNOWN;
464
461
/* This is already done by parse_opt_config_file() */
466
463
case 130: /* --userid */
467
uid = (uid_t)strtol(arg, NULL, 10);
464
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
465
if(ret < 1 or tmpmax != (uid_t)tmpmax
466
or arg[numchars] != '\0'){
467
fprintf(stderr, "Bad user ID number: \"%s\", using %"
468
PRIdMAX "\n", arg, (intmax_t)uid);
469
473
case 131: /* --groupid */
470
gid = (gid_t)strtol(arg, NULL, 10);
474
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
475
if(ret < 1 or tmpmax != (gid_t)tmpmax
476
or arg[numchars] != '\0'){
477
fprintf(stderr, "Bad group ID number: \"%s\", using %"
478
PRIdMAX "\n", arg, (intmax_t)gid);
472
483
case 132: /* --debug */
487
* When adding more options before this line, remember to also add a
488
* "case" to the "parse_opt_config_file" function below.
475
490
case ARGP_KEY_ARG:
476
491
/* Cryptsetup always passes an argument, which is an empty
477
492
string if "none" was specified in /etc/crypttab. So if
491
506
/* This option parser is the same as parse_opt() above, except it
492
507
ignores everything but the --config-file option. */
493
error_t parse_opt_config_file (int key, char *arg,
494
__attribute__((unused))
495
struct argp_state *state) {
508
error_t parse_opt_config_file(int key, char *arg,
509
__attribute__((unused))
510
struct argp_state *state){
497
512
case 'g': /* --global-options */
498
513
case 'G': /* --global-env */
499
514
case 'o': /* --options-for */
527
542
.doc = "Mandos plugin runner -- Run plugins" };
529
/* Parse using the parse_opt_config_file in order to get the custom
544
/* Parse using parse_opt_config_file() in order to get the custom
530
545
config file location, if any. */
531
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
532
if (ret == ARGP_ERR_UNKNOWN){
546
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
547
if(ret == ARGP_ERR_UNKNOWN){
533
548
fprintf(stderr, "Unknown error while parsing arguments\n");
534
549
exitstatus = EXIT_FAILURE;
548
563
char *org_line = NULL;
549
564
char *p, *arg, *new_arg, *line;
552
566
const char whitespace_delims[] = " \r\t\f\v\n";
553
567
const char comment_delim[] = "#";
602
616
/* Check for harmful errors and go to fallback. Other errors might
603
617
not affect opening plugins */
604
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
618
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
606
620
exitstatus = EXIT_FAILURE;
610
624
/* If there was any arguments from configuration file,
611
625
pass them to parser as command arguments */
612
626
if(custom_argv != NULL){
613
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
615
if (ret == ARGP_ERR_UNKNOWN){
627
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
629
if(ret == ARGP_ERR_UNKNOWN){
616
630
fprintf(stderr, "Unknown error while parsing arguments\n");
617
631
exitstatus = EXIT_FAILURE;
622
636
/* Parse actual command line arguments, to let them override the
624
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
625
if (ret == ARGP_ERR_UNKNOWN){
638
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
639
if(ret == ARGP_ERR_UNKNOWN){
626
640
fprintf(stderr, "Unknown error while parsing arguments\n");
627
641
exitstatus = EXIT_FAILURE;
635
649
for(char **a = p->argv; *a != NULL; a++){
636
650
fprintf(stderr, "\tArg: %s\n", *a);
638
fprintf(stderr, "...and %u environment variables\n", p->envc);
652
fprintf(stderr, "...and %d environment variables\n", p->envc);
639
653
for(char **a = p->environ; *a != NULL; a++){
640
654
fprintf(stderr, "\t%s\n", *a);
704
718
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
706
721
".dpkg-divert", NULL };
707
722
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
708
723
size_t pre_len = strlen(*pre);
752
767
ret = stat(filename, &st);
759
774
/* Ignore non-executable files */
760
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
775
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
762
777
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
763
778
" with bad type or mode\n", filename);
831
846
/* Block SIGCHLD until process is safely in process list */
832
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
847
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
834
849
perror("sigprocmask");
835
850
exitstatus = EXIT_FAILURE;
849
864
perror("sigaction");
850
865
_exit(EXIT_FAILURE);
852
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
867
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
854
869
perror("sigprocmask");
855
870
_exit(EXIT_FAILURE);
858
873
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
883
898
close(pipefd[1]); /* Close unused write end of pipe */
885
900
plugin *new_plugin = getplugin(dirst->d_name);
886
if (new_plugin == NULL){
901
if(new_plugin == NULL){
887
902
perror("getplugin");
888
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
903
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
890
905
perror("sigprocmask");
899
914
/* Unblock SIGCHLD so signal handler can be run if this process
900
915
has already completed */
901
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
916
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
903
918
perror("sigprocmask");
904
919
exitstatus = EXIT_FAILURE;
908
923
FD_SET(new_plugin->fd, &rfds_all);
910
if (maxfd < new_plugin->fd){
925
if(maxfd < new_plugin->fd){
911
926
maxfd = new_plugin->fd;
932
free_plugin(getplugin(NULL));
919
934
for(plugin *p = plugin_list; p != NULL; p = p->next){
926
941
free_plugin_list();
930
945
/* Main loop while running plugins exist */
931
946
while(plugin_list){
932
947
fd_set rfds = rfds_all;
933
948
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
934
if (select_ret == -1){
949
if(select_ret == -1){
935
950
perror("select");
936
951
exitstatus = EXIT_FAILURE;
940
955
from one of them */
941
956
for(plugin *proc = plugin_list; proc != NULL;){
942
957
/* Is this process completely done? */
943
if(proc->eof and proc->completed){
958
if(proc->completed and proc->eof){
944
959
/* Only accept the plugin output if it exited cleanly */
945
960
if(not WIFEXITED(proc->status)
946
961
or WEXITSTATUS(proc->status) != 0){
950
965
if(WIFEXITED(proc->status)){
951
fprintf(stderr, "Plugin %u exited with status %d\n",
952
(unsigned int) (proc->pid),
966
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
967
" status %d\n", proc->name,
968
(intmax_t) (proc->pid),
953
969
WEXITSTATUS(proc->status));
954
} else if(WIFSIGNALED(proc->status)) {
955
fprintf(stderr, "Plugin %u killed by signal %d\n",
956
(unsigned int) (proc->pid),
970
} else if(WIFSIGNALED(proc->status)){
971
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
972
" signal %d\n", proc->name,
973
(intmax_t) (proc->pid),
957
974
WTERMSIG(proc->status));
958
975
} else if(WCOREDUMP(proc->status)){
959
fprintf(stderr, "Plugin %d dumped core\n",
960
(unsigned int) (proc->pid));
976
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
977
" core\n", proc->name, (intmax_t) (proc->pid));
992
plugin *next_plugin = proc->next;
975
996
/* We are done modifying process list, so unblock signal */
976
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
997
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
979
1000
perror("sigprocmask");
980
1001
exitstatus = EXIT_FAILURE;
1012
1030
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1013
1031
proc->buffer = realloc(proc->buffer, proc->buffer_size
1014
1032
+ (size_t) BUFFER_SIZE);
1015
if (proc->buffer == NULL){
1033
if(proc->buffer == NULL){
1016
1034
perror("malloc");
1017
1035
exitstatus = EXIT_FAILURE;
1020
1038
proc->buffer_size += BUFFER_SIZE;
1022
1040
/* Read from the process */
1023
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1041
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1026
1044
/* Read error from this process; ignore the error */
1027
1045
proc = proc->next;
1032
1050
proc->eof = true;
1034
proc->buffer_length += (size_t) ret;
1052
proc->buffer_length += (size_t) sret;