1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
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
38
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
38
FD_SET(), FD_ISSET(), FD_CLR */
40
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
43
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
42
#include <iso646.h> /* and, or, not */
45
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
54
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
56
#include <string.h> /* strsep, strlen(), asprintf(),
54
#include <string.h> /* strsep, strlen(), asprintf() */
58
55
#include <errno.h> /* errno */
59
56
#include <argp.h> /* struct argp_option, struct
60
57
argp_state, struct argp,
64
61
#include <signal.h> /* struct sigaction, sigemptyset(),
65
62
sigaddset(), sigaction(),
66
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
64
SIG_UNBLOCK, kill() */
69
65
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
72
67
#define BUFFER_SIZE 256
103
98
or if none is found, creates a new one */
104
99
static plugin *getplugin(char *name){
105
100
/* Check for exiting plugin with that name */
106
for(plugin *p = plugin_list; p != NULL; p = p->next){
108
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))){
112
107
/* Create a new plugin */
113
108
plugin *new_plugin = malloc(sizeof(plugin));
114
if(new_plugin == NULL){
109
if (new_plugin == NULL){
117
112
char *copy_name = NULL;
118
113
if(name != NULL){
119
114
copy_name = strdup(name);
120
115
if(copy_name == NULL){
126
*new_plugin = (plugin){ .name = copy_name,
129
.next = plugin_list };
120
*new_plugin = (plugin) { .name = copy_name,
123
.next = plugin_list };
131
125
new_plugin->argv = malloc(sizeof(char *) * 2);
132
if(new_plugin->argv == NULL){
126
if (new_plugin->argv == NULL){
134
128
free(new_plugin);
211
205
* Based on the example in the GNU LibC manual chapter 13.13 "File
212
206
* Descriptor Flags".
213
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
207
* *Note File Descriptor Flags:(libc)Descriptor Flags.
215
209
static int set_cloexec_flag(int fd){
216
210
int ret = fcntl(fd, F_GETFD, 0);
383
error_t parse_opt(int key, char *arg, __attribute__((unused))
384
struct argp_state *state){
373
error_t parse_opt (int key, char *arg, __attribute__((unused))
374
struct argp_state *state) {
387
376
case 'g': /* --global-options */
390
while((plugin_option = strsep(&arg, ",")) != NULL){
391
if(plugin_option[0] == '\0'){
379
while((p = strsep(&arg, ",")) != NULL){
394
if(not add_argument(getplugin(NULL), plugin_option)){
383
if(not add_argument(getplugin(NULL), p)){
395
384
perror("add_argument");
396
385
return ARGP_ERR_UNKNOWN;
409
398
case 'o': /* --options-for */
411
char *plugin_name = strsep(&arg, ":");
412
if(plugin_name[0] == '\0'){
416
while((plugin_option = strsep(&arg, ",")) != NULL){
417
if(not add_argument(getplugin(plugin_name), plugin_option)){
400
char *p_name = strsep(&arg, ":");
401
if(p_name[0] == '\0' or arg == NULL){
404
char *opt = strsep(&arg, ":");
405
if(opt[0] == '\0' or opt == NULL){
409
while((p = strsep(&opt, ",")) != NULL){
413
if(not add_argument(getplugin(p_name), p)){
418
414
perror("add_argument");
419
415
return ARGP_ERR_UNKNOWN;
459
455
plugindir = strdup(arg);
460
456
if(plugindir == NULL){
461
457
perror("strdup");
464
460
case 129: /* --config-file */
465
461
/* This is already done by parse_opt_config_file() */
467
463
case 130: /* --userid */
469
tmpmax = strtoimax(arg, &tmp, 10);
470
if(errno != 0 or tmp == arg or *tmp != '\0'
471
or tmpmax != (uid_t)tmpmax){
472
fprintf(stderr, "Bad user ID number: \"%s\", using %"
473
PRIdMAX "\n", arg, (intmax_t)uid);
464
uid = (uid_t)strtol(arg, NULL, 10);
478
466
case 131: /* --groupid */
480
tmpmax = strtoimax(arg, &tmp, 10);
481
if(errno != 0 or tmp == arg or *tmp != '\0'
482
or tmpmax != (gid_t)tmpmax){
483
fprintf(stderr, "Bad group ID number: \"%s\", using %"
484
PRIdMAX "\n", arg, (intmax_t)gid);
467
gid = (gid_t)strtol(arg, NULL, 10);
489
469
case 132: /* --debug */
493
* When adding more options before this line, remember to also add a
494
* "case" to the "parse_opt_config_file" function below.
496
472
case ARGP_KEY_ARG:
497
473
/* Cryptsetup always passes an argument, which is an empty
498
474
string if "none" was specified in /etc/crypttab. So if
512
488
/* This option parser is the same as parse_opt() above, except it
513
489
ignores everything but the --config-file option. */
514
error_t parse_opt_config_file(int key, char *arg,
515
__attribute__((unused))
516
struct argp_state *state){
490
error_t parse_opt_config_file (int key, char *arg,
491
__attribute__((unused))
492
struct argp_state *state) {
518
494
case 'g': /* --global-options */
519
495
case 'G': /* --global-env */
520
496
case 'o': /* --options-for */
548
524
.doc = "Mandos plugin runner -- Run plugins" };
550
/* 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
551
527
config file location, if any. */
552
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
553
if(ret == ARGP_ERR_UNKNOWN){
528
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
529
if (ret == ARGP_ERR_UNKNOWN){
554
530
fprintf(stderr, "Unknown error while parsing arguments\n");
555
531
exitstatus = EXIT_FAILURE;
560
536
argp.parser = parse_opt;
562
538
/* Open the configfile if available */
539
if (argfile == NULL){
564
540
conffp = fopen(AFILE, "r");
566
542
conffp = fopen(argfile, "r");
568
544
if(conffp != NULL){
569
545
char *org_line = NULL;
570
546
char *p, *arg, *new_arg, *line;
572
549
const char whitespace_delims[] = " \r\t\f\v\n";
573
550
const char comment_delim[] = "#";
576
553
custom_argv = malloc(sizeof(char*) * 2);
577
554
if(custom_argv == NULL){
616
593
custom_argv[custom_argc-1] = new_arg;
617
custom_argv[custom_argc] = NULL;
594
custom_argv[custom_argc] = NULL;
621
ret = fclose(conffp);
622
}while(ret == EOF and errno == EINTR);
625
exitstatus = EXIT_FAILURE;
630
599
/* Check for harmful errors and go to fallback. Other errors might
631
600
not affect opening plugins */
632
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
601
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
634
603
exitstatus = EXIT_FAILURE;
638
607
/* If there was any arguments from configuration file,
639
608
pass them to parser as command arguments */
640
609
if(custom_argv != NULL){
641
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
643
if(ret == ARGP_ERR_UNKNOWN){
610
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
612
if (ret == ARGP_ERR_UNKNOWN){
644
613
fprintf(stderr, "Unknown error while parsing arguments\n");
645
614
exitstatus = EXIT_FAILURE;
650
619
/* Parse actual command line arguments, to let them override the
652
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
653
if(ret == ARGP_ERR_UNKNOWN){
621
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
622
if (ret == ARGP_ERR_UNKNOWN){
654
623
fprintf(stderr, "Unknown error while parsing arguments\n");
655
624
exitstatus = EXIT_FAILURE;
663
632
for(char **a = p->argv; *a != NULL; a++){
664
633
fprintf(stderr, "\tArg: %s\n", *a);
666
fprintf(stderr, "...and %d environment variables\n", p->envc);
635
fprintf(stderr, "...and %u environment variables\n", p->envc);
667
636
for(char **a = p->environ; *a != NULL; a++){
668
637
fprintf(stderr, "\t%s\n", *a);
732
701
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
735
703
".dpkg-divert", NULL };
736
704
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
737
705
size_t pre_len = strlen(*pre);
781
749
ret = stat(filename, &st);
788
756
/* Ignore non-executable files */
789
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)){
791
759
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
792
760
" with bad type or mode\n", filename);
860
828
/* Block SIGCHLD until process is safely in process list */
861
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
829
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
863
831
perror("sigprocmask");
864
832
exitstatus = EXIT_FAILURE;
912
880
close(pipefd[1]); /* Close unused write end of pipe */
914
882
plugin *new_plugin = getplugin(dirst->d_name);
915
if(new_plugin == NULL){
883
if (new_plugin == NULL){
916
884
perror("getplugin");
917
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
885
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
919
887
perror("sigprocmask");
928
896
/* Unblock SIGCHLD so signal handler can be run if this process
929
897
has already completed */
930
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
898
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
932
900
perror("sigprocmask");
933
901
exitstatus = EXIT_FAILURE;
937
905
FD_SET(new_plugin->fd, &rfds_all);
939
if(maxfd < new_plugin->fd){
907
if (maxfd < new_plugin->fd){
940
908
maxfd = new_plugin->fd;
946
free_plugin(getplugin(NULL));
948
915
for(plugin *p = plugin_list; p != NULL; p = p->next){
969
936
from one of them */
970
937
for(plugin *proc = plugin_list; proc != NULL;){
971
938
/* Is this process completely done? */
972
if(proc->completed and proc->eof){
939
if(proc->eof and proc->completed){
973
940
/* Only accept the plugin output if it exited cleanly */
974
941
if(not WIFEXITED(proc->status)
975
942
or WEXITSTATUS(proc->status) != 0){
976
943
/* Bad exit by plugin */
979
946
if(WIFEXITED(proc->status)){
980
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
981
" status %d\n", proc->name,
982
(intmax_t) (proc->pid),
947
fprintf(stderr, "Plugin %u exited with status %d\n",
948
(unsigned int) (proc->pid),
983
949
WEXITSTATUS(proc->status));
984
} else if(WIFSIGNALED(proc->status)){
985
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
986
" signal %d: %s\n", proc->name,
987
(intmax_t) (proc->pid),
988
WTERMSIG(proc->status),
989
strsignal(WTERMSIG(proc->status)));
950
} else if(WIFSIGNALED(proc->status)) {
951
fprintf(stderr, "Plugin %u killed by signal %d\n",
952
(unsigned int) (proc->pid),
953
WTERMSIG(proc->status));
990
954
} else if(WCOREDUMP(proc->status)){
991
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
992
" core\n", proc->name, (intmax_t) (proc->pid));
955
fprintf(stderr, "Plugin %d dumped core\n",
956
(unsigned int) (proc->pid));
996
960
/* Remove the plugin */
997
961
FD_CLR(proc->fd, &rfds_all);
999
963
/* Block signal while modifying process_list */
1000
964
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1009
973
proc = next_plugin;
1011
975
/* We are done modifying process list, so unblock signal */
1012
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
976
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
1015
979
perror("sigprocmask");
1016
980
exitstatus = EXIT_FAILURE;
1045
1009
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1046
1010
proc->buffer = realloc(proc->buffer, proc->buffer_size
1047
1011
+ (size_t) BUFFER_SIZE);
1048
if(proc->buffer == NULL){
1012
if (proc->buffer == NULL){
1049
1013
perror("malloc");
1050
1014
exitstatus = EXIT_FAILURE;
1053
1017
proc->buffer_size += BUFFER_SIZE;
1055
1019
/* Read from the process */
1056
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1020
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1059
1023
/* Read error from this process; ignore the error */
1060
1024
proc = proc->next;
1065
1029
proc->eof = true;
1067
proc->buffer_length += (size_t) sret;
1031
proc->buffer_length += (size_t) ret;
1075
1039
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){