3
3
* Mandos plugin runner - Run Mandos plugins
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
5
* Copyright © 2007-2008 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
28
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
33
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
33
stat, waitpid(), WIFEXITED(),
35
34
WEXITSTATUS(), wait(), pid_t,
47
46
fcntl(), setuid(), setgid(),
48
47
F_GETFD, F_SETFD, FD_CLOEXEC,
49
48
access(), pipe(), fork(), close()
50
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
51
50
execv(), write(), read(),
53
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
62
61
#include <signal.h> /* struct sigaction, sigemptyset(),
63
62
sigaddset(), sigaction(),
64
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
SIG_UNBLOCK, kill(), sig_atomic_t
64
SIG_UNBLOCK, kill() */
67
65
#include <errno.h> /* errno, EBADF */
68
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
70
67
#define BUFFER_SIZE 256
72
69
#define PDIR "/lib/mandos/plugins.d"
73
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
75
const char *argp_program_version = "plugin-runner " VERSION;
72
const char *argp_program_version = "plugin-runner 1.0";
76
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
78
77
typedef struct plugin{
79
78
char *name; /* can be NULL or any plugin name */
101
100
or if none is found, creates a new one */
102
101
static plugin *getplugin(char *name){
103
102
/* 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))){
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))){
110
109
/* Create a new plugin */
111
110
plugin *new_plugin = malloc(sizeof(plugin));
112
if(new_plugin == NULL){
111
if (new_plugin == NULL){
115
114
char *copy_name = NULL;
116
115
if(name != NULL){
117
116
copy_name = strdup(name);
118
117
if(copy_name == NULL){
124
*new_plugin = (plugin){ .name = copy_name,
127
.next = plugin_list };
122
*new_plugin = (plugin) { .name = copy_name,
125
.next = plugin_list };
129
127
new_plugin->argv = malloc(sizeof(char *) * 2);
130
if(new_plugin->argv == NULL){
128
if (new_plugin->argv == NULL){
132
130
free(new_plugin);
210
208
* Descriptor Flags".
211
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
213
static int set_cloexec_flag(int fd){
211
static int set_cloexec_flag(int fd)
214
213
int ret = fcntl(fd, F_GETFD, 0);
215
214
/* If reading the flags failed, return error indication now. */
224
223
/* Mark processes as completed when they exit, and save their exit
226
static void handle_sigchld(__attribute__((unused)) int sig){
227
int old_errno = errno;
225
void handle_sigchld(__attribute__((unused)) int sig){
229
227
plugin *proc = plugin_list;
252
250
proc->status = status;
251
proc->completed = true;
258
255
/* Prints out a password to stdout */
259
static bool print_out_password(const char *buffer, size_t length){
256
bool print_out_password(const char *buffer, size_t length){
258
if(length>0 and buffer[length-1] == '\n'){
261
261
for(size_t written = 0; written < length; written += (size_t)ret){
262
262
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
263
263
length - written));
381
error_t parse_opt(int key, char *arg, __attribute__((unused))
382
struct argp_state *state){
379
error_t parse_opt (int key, char *arg, __attribute__((unused))
380
struct argp_state *state) {
384
382
case 'g': /* --global-options */
387
while((plugin_option = strsep(&arg, ",")) != NULL){
388
if(plugin_option[0] == '\0'){
385
while((p = strsep(&arg, ",")) != NULL){
391
if(not add_argument(getplugin(NULL), plugin_option)){
389
if(not add_argument(getplugin(NULL), p)){
392
390
perror("add_argument");
393
391
return ARGP_ERR_UNKNOWN;
406
404
case 'o': /* --options-for */
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)){
406
char *p_name = strsep(&arg, ":");
407
if(p_name[0] == '\0' or arg == NULL){
410
char *opt = strsep(&arg, ":");
411
if(opt[0] == '\0' or opt == NULL){
415
while((p = strsep(&opt, ",")) != NULL){
419
if(not add_argument(getplugin(p_name), p)){
415
420
perror("add_argument");
416
421
return ARGP_ERR_UNKNOWN;
462
467
/* This is already done by parse_opt_config_file() */
464
469
case 130: /* --userid */
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);
470
uid = (uid_t)strtol(arg, NULL, 10);
474
472
case 131: /* --groupid */
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);
473
gid = (gid_t)strtol(arg, NULL, 10);
484
475
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.
491
478
case ARGP_KEY_ARG:
492
/* Cryptsetup always passes an argument, which is an empty
493
string if "none" was specified in /etc/crypttab. So if
494
argument was empty, we ignore it silently. */
496
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
479
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
499
481
case ARGP_KEY_END:
507
489
/* This option parser is the same as parse_opt() above, except it
508
490
ignores everything but the --config-file option. */
509
error_t parse_opt_config_file(int key, char *arg,
510
__attribute__((unused))
511
struct argp_state *state){
491
error_t parse_opt_config_file (int key, char *arg,
492
__attribute__((unused))
493
struct argp_state *state) {
513
495
case 'g': /* --global-options */
514
496
case 'G': /* --global-env */
515
497
case 'o': /* --options-for */
543
525
.doc = "Mandos plugin runner -- Run plugins" };
545
/* 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
546
528
config file location, if any. */
547
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
548
if(ret == ARGP_ERR_UNKNOWN){
529
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
530
if (ret == ARGP_ERR_UNKNOWN){
549
531
fprintf(stderr, "Unknown error while parsing arguments\n");
550
532
exitstatus = EXIT_FAILURE;
564
546
char *org_line = NULL;
565
547
char *p, *arg, *new_arg, *line;
567
550
const char whitespace_delims[] = " \r\t\f\v\n";
568
551
const char comment_delim[] = "#";
617
600
/* Check for harmful errors and go to fallback. Other errors might
618
601
not affect opening plugins */
619
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
602
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
621
604
exitstatus = EXIT_FAILURE;
625
608
/* If there was any arguments from configuration file,
626
609
pass them to parser as command arguments */
627
610
if(custom_argv != NULL){
628
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
630
if(ret == ARGP_ERR_UNKNOWN){
611
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
613
if (ret == ARGP_ERR_UNKNOWN){
631
614
fprintf(stderr, "Unknown error while parsing arguments\n");
632
615
exitstatus = EXIT_FAILURE;
637
620
/* Parse actual command line arguments, to let them override the
639
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
640
if(ret == ARGP_ERR_UNKNOWN){
622
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
623
if (ret == ARGP_ERR_UNKNOWN){
641
624
fprintf(stderr, "Unknown error while parsing arguments\n");
642
625
exitstatus = EXIT_FAILURE;
650
633
for(char **a = p->argv; *a != NULL; a++){
651
634
fprintf(stderr, "\tArg: %s\n", *a);
653
fprintf(stderr, "...and %d environment variables\n", p->envc);
636
fprintf(stderr, "...and %u environment variables\n", p->envc);
654
637
for(char **a = p->environ; *a != NULL; a++){
655
638
fprintf(stderr, "\t%s\n", *a);
719
702
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
722
704
".dpkg-divert", NULL };
723
705
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
724
706
size_t pre_len = strlen(*pre);
758
if(plugindir == NULL){
759
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
761
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
740
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
764
742
perror("asprintf");
768
746
ret = stat(filename, &st);
775
753
/* Ignore non-executable files */
776
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
754
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
778
756
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
779
757
" with bad type or mode\n", filename);
847
825
/* Block SIGCHLD until process is safely in process list */
848
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
826
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
850
828
perror("sigprocmask");
851
829
exitstatus = EXIT_FAILURE;
865
843
perror("sigaction");
866
844
_exit(EXIT_FAILURE);
868
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
846
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
870
848
perror("sigprocmask");
871
849
_exit(EXIT_FAILURE);
874
852
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
899
877
close(pipefd[1]); /* Close unused write end of pipe */
901
879
plugin *new_plugin = getplugin(dirst->d_name);
902
if(new_plugin == NULL){
880
if (new_plugin == NULL){
903
881
perror("getplugin");
904
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
882
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
906
884
perror("sigprocmask");
915
893
/* Unblock SIGCHLD so signal handler can be run if this process
916
894
has already completed */
917
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
895
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
919
897
perror("sigprocmask");
920
898
exitstatus = EXIT_FAILURE;
924
902
FD_SET(new_plugin->fd, &rfds_all);
926
if(maxfd < new_plugin->fd){
904
if (maxfd < new_plugin->fd){
927
905
maxfd = new_plugin->fd;
933
free_plugin(getplugin(NULL));
935
913
for(plugin *p = plugin_list; p != NULL; p = p->next){
942
920
free_plugin_list();
946
924
/* Main loop while running plugins exist */
947
925
while(plugin_list){
948
926
fd_set rfds = rfds_all;
949
927
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
950
if(select_ret == -1){
928
if (select_ret == -1){
951
929
perror("select");
952
930
exitstatus = EXIT_FAILURE;
956
934
from one of them */
957
935
for(plugin *proc = plugin_list; proc != NULL;){
958
936
/* Is this process completely done? */
959
if(proc->completed and proc->eof){
937
if(proc->eof and proc->completed){
960
938
/* Only accept the plugin output if it exited cleanly */
961
939
if(not WIFEXITED(proc->status)
962
940
or WEXITSTATUS(proc->status) != 0){
966
944
if(WIFEXITED(proc->status)){
967
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
968
" status %d\n", proc->name,
969
(intmax_t) (proc->pid),
945
fprintf(stderr, "Plugin %u exited with status %d\n",
946
(unsigned int) (proc->pid),
970
947
WEXITSTATUS(proc->status));
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),
948
} else if(WIFSIGNALED(proc->status)) {
949
fprintf(stderr, "Plugin %u killed by signal %d\n",
950
(unsigned int) (proc->pid),
975
951
WTERMSIG(proc->status));
976
952
} else if(WCOREDUMP(proc->status)){
977
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
978
" core\n", proc->name, (intmax_t) (proc->pid));
953
fprintf(stderr, "Plugin %d dumped core\n",
954
(unsigned int) (proc->pid));
969
/* We are done modifying process list, so unblock signal */
970
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
973
perror("sigprocmask");
974
exitstatus = EXIT_FAILURE;
978
if(plugin_list == NULL){
993
982
plugin *next_plugin = proc->next;
994
983
free_plugin(proc);
995
984
proc = next_plugin;
997
/* We are done modifying process list, so unblock signal */
998
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1001
perror("sigprocmask");
1002
exitstatus = EXIT_FAILURE;
1006
if(plugin_list == NULL){
1013
988
/* This process exited nicely, so print its buffer */
1015
990
bool bret = print_out_password(proc->buffer,
1016
991
proc->buffer_length);
1031
1006
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1032
1007
proc->buffer = realloc(proc->buffer, proc->buffer_size
1033
1008
+ (size_t) BUFFER_SIZE);
1034
if(proc->buffer == NULL){
1009
if (proc->buffer == NULL){
1035
1010
perror("malloc");
1036
1011
exitstatus = EXIT_FAILURE;
1039
1014
proc->buffer_size += BUFFER_SIZE;
1041
1016
/* Read from the process */
1042
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1017
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1045
1020
/* Read error from this process; ignore the error */
1046
1021
proc = proc->next;
1051
1026
proc->eof = true;
1053
proc->buffer_length += (size_t) sret;
1028
proc->buffer_length += (size_t) ret;
1065
1040
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1066
1041
char *passwordbuffer = getpass("Password: ");
1067
size_t len = strlen(passwordbuffer);
1068
/* Strip trailing newline */
1069
if(len > 0 and passwordbuffer[len-1] == '\n'){
1070
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1073
bret = print_out_password(passwordbuffer, len);
1042
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1075
1044
perror("print_out_password");
1076
1045
exitstatus = EXIT_FAILURE;