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, PRIdMAX, strtoimax() */
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 */
90
89
size_t buffer_size;
91
90
size_t buffer_length;
93
volatile sig_atomic_t completed;
92
volatile bool completed;
95
94
struct plugin *next;
98
97
static plugin *plugin_list = NULL;
100
/* Gets an existing plugin based on name,
99
/* Gets a existing plugin based on 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);
189
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
190
188
/* Search for this environment variable */
191
189
for(char **e = p->environ; *e != NULL; e++){
192
if(strncmp(*e, def, namelen + 1) == 0){
190
if(strncmp(*e, def, namelen+1) == 0){
193
191
/* It already exists */
195
char *new = realloc(*e, strlen(def) + 1);
193
char *new = realloc(*e, strlen(def));
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. */
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) {
385
382
case 'g': /* --global-options */
388
while((plugin_option = strsep(&arg, ",")) != NULL){
389
if(plugin_option[0] == '\0'){
385
while((p = strsep(&arg, ",")) != NULL){
392
if(not add_argument(getplugin(NULL), plugin_option)){
389
if(not add_argument(getplugin(NULL), p)){
393
390
perror("add_argument");
394
391
return ARGP_ERR_UNKNOWN;
403
if(not add_environment(getplugin(NULL), arg, true)){
404
perror("add_environment");
401
char *envdef = strdup(arg);
405
if(not add_environment(getplugin(NULL), envdef, true)){
406
perror("add_environment");
407
410
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)){
416
perror("add_argument");
417
return ARGP_ERR_UNKNOWN;
412
char *p_name = strsep(&arg, ":");
413
if(p_name[0] == '\0'){
416
char *opt = strsep(&arg, ":");
422
while((p = strsep(&opt, ",")) != NULL){
426
if(not add_argument(getplugin(p_name), p)){
427
perror("add_argument");
428
return ARGP_ERR_UNKNOWN;
428
440
if(envdef == NULL){
432
if(not add_environment(getplugin(arg), envdef+1, true)){
443
char *p_name = strndup(arg, (size_t) (envdef-arg));
448
if(not add_environment(getplugin(p_name), envdef, true)){
433
449
perror("add_environment");
437
453
case 'd': /* --disable */
439
455
plugin *p = getplugin(arg);
441
457
return ARGP_ERR_UNKNOWN;
463
478
/* This is already done by parse_opt_config_file() */
465
480
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);
481
uid = (uid_t)strtol(arg, NULL, 10);
476
483
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);
484
gid = (gid_t)strtol(arg, NULL, 10);
487
486
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
489
case ARGP_KEY_ARG:
495
/* Cryptsetup always passes an argument, which is an empty
496
string if "none" was specified in /etc/crypttab. So if
497
argument was empty, we ignore it silently. */
499
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
490
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
502
492
case ARGP_KEY_END:
510
500
/* This option parser is the same as parse_opt() above, except it
511
501
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){
502
error_t parse_opt_config_file (int key, char *arg,
503
__attribute__((unused))
504
struct argp_state *state) {
516
506
case 'g': /* --global-options */
517
507
case 'G': /* --global-env */
518
508
case 'o': /* --options-for */
546
535
.doc = "Mandos plugin runner -- Run plugins" };
548
/* Parse using parse_opt_config_file() in order to get the custom
537
/* Parse using the parse_opt_config_file in order to get the custom
549
538
config file location, if any. */
550
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
551
if(ret == ARGP_ERR_UNKNOWN){
539
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
540
if (ret == ARGP_ERR_UNKNOWN){
552
541
fprintf(stderr, "Unknown error while parsing arguments\n");
553
542
exitstatus = EXIT_FAILURE;
628
618
/* If there was any arguments from configuration file,
629
619
pass them to parser as command arguments */
630
620
if(custom_argv != NULL){
631
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
633
if(ret == ARGP_ERR_UNKNOWN){
621
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
623
if (ret == ARGP_ERR_UNKNOWN){
634
624
fprintf(stderr, "Unknown error while parsing arguments\n");
635
625
exitstatus = EXIT_FAILURE;
640
630
/* 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){
632
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
633
if (ret == ARGP_ERR_UNKNOWN){
644
634
fprintf(stderr, "Unknown error while parsing arguments\n");
645
635
exitstatus = EXIT_FAILURE;
653
643
for(char **a = p->argv; *a != NULL; a++){
654
644
fprintf(stderr, "\tArg: %s\n", *a);
656
fprintf(stderr, "...and %d environment variables\n", p->envc);
646
fprintf(stderr, "...and %u environment variables\n", p->envc);
657
647
for(char **a = p->environ; *a != NULL; a++){
658
648
fprintf(stderr, "\t%s\n", *a);
761
if(plugindir == NULL){
762
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
764
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
750
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
767
752
perror("asprintf");
771
756
ret = stat(filename, &st);
778
763
/* Ignore non-executable files */
779
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
764
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
781
766
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
782
767
" with bad type or mode\n", filename);
850
835
/* Block SIGCHLD until process is safely in process list */
851
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
836
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
853
838
perror("sigprocmask");
854
839
exitstatus = EXIT_FAILURE;
868
853
perror("sigaction");
869
854
_exit(EXIT_FAILURE);
871
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
856
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
873
858
perror("sigprocmask");
874
859
_exit(EXIT_FAILURE);
877
862
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
902
887
close(pipefd[1]); /* Close unused write end of pipe */
904
889
plugin *new_plugin = getplugin(dirst->d_name);
905
if(new_plugin == NULL){
890
if (new_plugin == NULL){
906
891
perror("getplugin");
907
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
892
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
909
894
perror("sigprocmask");
918
903
/* Unblock SIGCHLD so signal handler can be run if this process
919
904
has already completed */
920
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
905
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
922
907
perror("sigprocmask");
923
908
exitstatus = EXIT_FAILURE;
927
912
FD_SET(new_plugin->fd, &rfds_all);
929
if(maxfd < new_plugin->fd){
914
if (maxfd < new_plugin->fd){
930
915
maxfd = new_plugin->fd;
936
free_plugin(getplugin(NULL));
938
923
for(plugin *p = plugin_list; p != NULL; p = p->next){
945
930
free_plugin_list();
949
934
/* Main loop while running plugins exist */
950
935
while(plugin_list){
951
936
fd_set rfds = rfds_all;
952
937
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
953
if(select_ret == -1){
938
if (select_ret == -1){
954
939
perror("select");
955
940
exitstatus = EXIT_FAILURE;
958
943
/* OK, now either a process completed, or something can be read
959
944
from one of them */
960
for(plugin *proc = plugin_list; proc != NULL;){
945
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
961
946
/* Is this process completely done? */
962
if(proc->completed and proc->eof){
947
if(proc->eof and proc->completed){
963
948
/* Only accept the plugin output if it exited cleanly */
964
949
if(not WIFEXITED(proc->status)
965
950
or WEXITSTATUS(proc->status) != 0){
966
951
/* Bad exit by plugin */
969
954
if(WIFEXITED(proc->status)){
970
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
971
" status %d\n", proc->name,
972
(intmax_t) (proc->pid),
955
fprintf(stderr, "Plugin %u exited with status %d\n",
956
(unsigned int) (proc->pid),
973
957
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),
958
} else if(WIFSIGNALED(proc->status)) {
959
fprintf(stderr, "Plugin %u killed by signal %d\n",
960
(unsigned int) (proc->pid),
978
961
WTERMSIG(proc->status));
979
962
} else if(WCOREDUMP(proc->status)){
980
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
981
" core\n", proc->name, (intmax_t) (proc->pid));
963
fprintf(stderr, "Plugin %d dumped core\n",
964
(unsigned int) (proc->pid));
985
968
/* Remove the plugin */
986
969
FD_CLR(proc->fd, &rfds_all);
988
971
/* Block signal while modifying process_list */
989
972
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
992
975
exitstatus = EXIT_FAILURE;
996
plugin *next_plugin = proc->next;
997
978
free_plugin(proc);
1000
979
/* We are done modifying process list, so unblock signal */
1001
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
980
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
1004
983
perror("sigprocmask");
1005
984
exitstatus = EXIT_FAILURE;
1027
1005
/* This process has not completed. Does it have any output? */
1028
1006
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1029
1007
/* This process had nothing to say at this time */
1033
1010
/* Before reading, make the process' data buffer large enough */
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 */
1054
1030
proc->eof = true;
1056
proc->buffer_length += (size_t) sret;
1032
proc->buffer_length += (size_t) ret;
1064
1040
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1068
1044
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1069
1045
char *passwordbuffer = getpass("Password: ");
1070
size_t len = strlen(passwordbuffer);
1071
/* Strip trailing newline */
1072
if(len > 0 and passwordbuffer[len-1] == '\n'){
1073
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1076
bret = print_out_password(passwordbuffer, len);
1046
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1078
1048
perror("print_out_password");
1079
1049
exitstatus = EXIT_FAILURE;