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
386
while((p = strsep(&arg, ",")) != NULL){
383
387
if(p[0] == '\0'){
398
char *envdef = strdup(arg);
402
if(not add_environment(getplugin(NULL), envdef, true)){
403
perror("add_environment");
401
if(not add_environment(getplugin(NULL), arg, true)){
402
perror("add_environment");
407
405
case 'o': /* --options-for */
409
407
char *p_name = strsep(&arg, ":");
410
408
if(p_name[0] == '\0' or arg == NULL){
435
433
if(envdef == NULL){
438
char *p_name = strndup(arg, (size_t) (envdef-arg));
443
if(not add_environment(getplugin(p_name), envdef, true)){
437
if(not add_environment(getplugin(arg), envdef+1, true)){
444
438
perror("add_environment");
448
442
case 'd': /* --disable */
450
444
plugin *p = getplugin(arg);
452
446
return ARGP_ERR_UNKNOWN;
473
468
/* This is already done by parse_opt_config_file() */
475
470
case 130: /* --userid */
476
uid = (uid_t)strtol(arg, NULL, 10);
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);
478
480
case 131: /* --groupid */
479
gid = (gid_t)strtol(arg, NULL, 10);
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);
481
490
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.
484
497
case ARGP_KEY_ARG:
485
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
498
/* Cryptsetup always passes an argument, which is an empty
499
string if "none" was specified in /etc/crypttab. So if
500
argument was empty, we ignore it silently. */
502
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
487
505
case ARGP_KEY_END:
495
513
/* This option parser is the same as parse_opt() above, except it
496
514
ignores everything but the --config-file option. */
497
error_t parse_opt_config_file (int key, char *arg,
498
__attribute__((unused))
499
struct argp_state *state) {
515
error_t parse_opt_config_file(int key, char *arg,
516
__attribute__((unused))
517
struct argp_state *state){
501
519
case 'g': /* --global-options */
502
520
case 'G': /* --global-env */
503
521
case 'o': /* --options-for */
530
549
.doc = "Mandos plugin runner -- Run plugins" };
532
/* Parse using the parse_opt_config_file in order to get the custom
551
/* Parse using parse_opt_config_file() in order to get the custom
533
552
config file location, if any. */
534
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
535
if (ret == ARGP_ERR_UNKNOWN){
553
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
554
if(ret == ARGP_ERR_UNKNOWN){
536
555
fprintf(stderr, "Unknown error while parsing arguments\n");
537
556
exitstatus = EXIT_FAILURE;
551
570
char *org_line = NULL;
552
571
char *p, *arg, *new_arg, *line;
555
573
const char whitespace_delims[] = " \r\t\f\v\n";
556
574
const char comment_delim[] = "#";
605
623
/* Check for harmful errors and go to fallback. Other errors might
606
624
not affect opening plugins */
607
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
625
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
609
627
exitstatus = EXIT_FAILURE;
613
631
/* If there was any arguments from configuration file,
614
632
pass them to parser as command arguments */
615
633
if(custom_argv != NULL){
616
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
618
if (ret == ARGP_ERR_UNKNOWN){
634
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
636
if(ret == ARGP_ERR_UNKNOWN){
619
637
fprintf(stderr, "Unknown error while parsing arguments\n");
620
638
exitstatus = EXIT_FAILURE;
625
643
/* Parse actual command line arguments, to let them override the
627
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
628
if (ret == ARGP_ERR_UNKNOWN){
645
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
646
if(ret == ARGP_ERR_UNKNOWN){
629
647
fprintf(stderr, "Unknown error while parsing arguments\n");
630
648
exitstatus = EXIT_FAILURE;
638
656
for(char **a = p->argv; *a != NULL; a++){
639
657
fprintf(stderr, "\tArg: %s\n", *a);
641
fprintf(stderr, "...and %u environment variables\n", p->envc);
659
fprintf(stderr, "...and %d environment variables\n", p->envc);
642
660
for(char **a = p->environ; *a != NULL; a++){
643
661
fprintf(stderr, "\t%s\n", *a);
707
725
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
709
728
".dpkg-divert", NULL };
710
729
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
711
730
size_t pre_len = strlen(*pre);
755
774
ret = stat(filename, &st);
762
781
/* Ignore non-executable files */
763
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
782
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
765
784
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
766
785
" with bad type or mode\n", filename);
834
853
/* Block SIGCHLD until process is safely in process list */
835
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
854
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
837
856
perror("sigprocmask");
838
857
exitstatus = EXIT_FAILURE;
852
871
perror("sigaction");
853
872
_exit(EXIT_FAILURE);
855
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
874
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
857
876
perror("sigprocmask");
858
877
_exit(EXIT_FAILURE);
861
880
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
886
905
close(pipefd[1]); /* Close unused write end of pipe */
888
907
plugin *new_plugin = getplugin(dirst->d_name);
889
if (new_plugin == NULL){
908
if(new_plugin == NULL){
890
909
perror("getplugin");
891
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
910
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
893
912
perror("sigprocmask");
902
921
/* Unblock SIGCHLD so signal handler can be run if this process
903
922
has already completed */
904
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
923
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
906
925
perror("sigprocmask");
907
926
exitstatus = EXIT_FAILURE;
911
930
FD_SET(new_plugin->fd, &rfds_all);
913
if (maxfd < new_plugin->fd){
932
if(maxfd < new_plugin->fd){
914
933
maxfd = new_plugin->fd;
922
940
for(plugin *p = plugin_list; p != NULL; p = p->next){
929
947
free_plugin_list();
933
951
/* Main loop while running plugins exist */
934
952
while(plugin_list){
935
953
fd_set rfds = rfds_all;
936
954
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
937
if (select_ret == -1){
955
if(select_ret == -1){
938
956
perror("select");
939
957
exitstatus = EXIT_FAILURE;
942
960
/* OK, now either a process completed, or something can be read
943
961
from one of them */
944
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
962
for(plugin *proc = plugin_list; proc != NULL;){
945
963
/* Is this process completely done? */
946
if(proc->eof and proc->completed){
964
if(proc->completed and proc->eof){
947
965
/* Only accept the plugin output if it exited cleanly */
948
966
if(not WIFEXITED(proc->status)
949
967
or WEXITSTATUS(proc->status) != 0){
953
971
if(WIFEXITED(proc->status)){
954
fprintf(stderr, "Plugin %u exited with status %d\n",
955
(unsigned int) (proc->pid),
972
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
973
" status %d\n", proc->name,
974
(intmax_t) (proc->pid),
956
975
WEXITSTATUS(proc->status));
957
} else if(WIFSIGNALED(proc->status)) {
958
fprintf(stderr, "Plugin %u killed by signal %d\n",
959
(unsigned int) (proc->pid),
976
} else if(WIFSIGNALED(proc->status)){
977
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
978
" signal %d\n", proc->name,
979
(intmax_t) (proc->pid),
960
980
WTERMSIG(proc->status));
961
981
} else if(WCOREDUMP(proc->status)){
962
fprintf(stderr, "Plugin %d dumped core\n",
963
(unsigned int) (proc->pid));
982
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
983
" core\n", proc->name, (intmax_t) (proc->pid));
974
994
exitstatus = EXIT_FAILURE;
998
plugin *next_plugin = proc->next;
977
999
free_plugin(proc);
978
1002
/* We are done modifying process list, so unblock signal */
979
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
1003
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
982
1006
perror("sigprocmask");
983
1007
exitstatus = EXIT_FAILURE;
1004
1029
/* This process has not completed. Does it have any output? */
1005
1030
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1006
1031
/* This process had nothing to say at this time */
1009
1035
/* Before reading, make the process' data buffer large enough */
1010
1036
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1011
1037
proc->buffer = realloc(proc->buffer, proc->buffer_size
1012
1038
+ (size_t) BUFFER_SIZE);
1013
if (proc->buffer == NULL){
1039
if(proc->buffer == NULL){
1014
1040
perror("malloc");
1015
1041
exitstatus = EXIT_FAILURE;
1018
1044
proc->buffer_size += BUFFER_SIZE;
1020
1046
/* Read from the process */
1021
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1047
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1024
1050
/* Read error from this process; ignore the error */
1029
1056
proc->eof = true;
1031
proc->buffer_length += (size_t) ret;
1058
proc->buffer_length += (size_t) sret;