3
3
* Mandos plugin runner - Run Mandos plugins
5
* Copyright © 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
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
98
100
or if none is found, creates a new one */
99
101
static plugin *getplugin(char *name){
100
102
/* Check for exiting plugin with that name */
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))){
103
for(plugin *p = plugin_list; p != NULL; p = p->next){
105
or (p->name and name and (strcmp(p->name, name) == 0))){
107
109
/* Create a new plugin */
108
110
plugin *new_plugin = malloc(sizeof(plugin));
109
if (new_plugin == NULL){
111
if(new_plugin == NULL){
112
114
char *copy_name = NULL;
373
error_t parse_opt (int key, char *arg, __attribute__((unused))
374
struct argp_state *state) {
377
error_t parse_opt(int key, char *arg, __attribute__((unused))
378
struct argp_state *state) {
376
380
case 'g': /* --global-options */
379
383
while((p = strsep(&arg, ",")) != NULL){
380
384
if(p[0] == '\0'){
461
465
/* This is already done by parse_opt_config_file() */
463
467
case 130: /* --userid */
464
uid = (uid_t)strtol(arg, NULL, 10);
468
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
469
if(ret < 1 or tmpmax != (uid_t)tmpmax
470
or arg[numchars] != '\0'){
471
fprintf(stderr, "Bad user ID number: \"%s\", using %"
472
PRIdMAX "\n", arg, (intmax_t)uid);
466
477
case 131: /* --groupid */
467
gid = (gid_t)strtol(arg, NULL, 10);
478
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
479
if(ret < 1 or tmpmax != (gid_t)tmpmax
480
or arg[numchars] != '\0'){
481
fprintf(stderr, "Bad group ID number: \"%s\", using %"
482
PRIdMAX "\n", arg, (intmax_t)gid);
469
487
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.
472
494
case ARGP_KEY_ARG:
473
495
/* Cryptsetup always passes an argument, which is an empty
474
496
string if "none" was specified in /etc/crypttab. So if
488
510
/* This option parser is the same as parse_opt() above, except it
489
511
ignores everything but the --config-file option. */
490
error_t parse_opt_config_file (int key, char *arg,
491
__attribute__((unused))
492
struct argp_state *state) {
512
error_t parse_opt_config_file(int key, char *arg,
513
__attribute__((unused))
514
struct argp_state *state) {
494
516
case 'g': /* --global-options */
495
517
case 'G': /* --global-env */
496
518
case 'o': /* --options-for */
524
546
.doc = "Mandos plugin runner -- Run plugins" };
526
/* Parse using the parse_opt_config_file in order to get the custom
548
/* Parse using parse_opt_config_file() in order to get the custom
527
549
config file location, if any. */
528
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
529
if (ret == ARGP_ERR_UNKNOWN){
550
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
551
if(ret == ARGP_ERR_UNKNOWN){
530
552
fprintf(stderr, "Unknown error while parsing arguments\n");
531
553
exitstatus = EXIT_FAILURE;
545
567
char *org_line = NULL;
546
568
char *p, *arg, *new_arg, *line;
549
570
const char whitespace_delims[] = " \r\t\f\v\n";
550
571
const char comment_delim[] = "#";
599
620
/* Check for harmful errors and go to fallback. Other errors might
600
621
not affect opening plugins */
601
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
622
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
603
624
exitstatus = EXIT_FAILURE;
607
628
/* If there was any arguments from configuration file,
608
629
pass them to parser as command arguments */
609
630
if(custom_argv != NULL){
610
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
612
if (ret == ARGP_ERR_UNKNOWN){
631
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
633
if(ret == ARGP_ERR_UNKNOWN){
613
634
fprintf(stderr, "Unknown error while parsing arguments\n");
614
635
exitstatus = EXIT_FAILURE;
619
640
/* Parse actual command line arguments, to let them override the
621
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
622
if (ret == ARGP_ERR_UNKNOWN){
642
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
643
if(ret == ARGP_ERR_UNKNOWN){
623
644
fprintf(stderr, "Unknown error while parsing arguments\n");
624
645
exitstatus = EXIT_FAILURE;
632
653
for(char **a = p->argv; *a != NULL; a++){
633
654
fprintf(stderr, "\tArg: %s\n", *a);
635
fprintf(stderr, "...and %u environment variables\n", p->envc);
656
fprintf(stderr, "...and %d environment variables\n", p->envc);
636
657
for(char **a = p->environ; *a != NULL; a++){
637
658
fprintf(stderr, "\t%s\n", *a);
750
771
ret = stat(filename, &st);
757
778
/* Ignore non-executable files */
758
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
779
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
760
781
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
761
782
" with bad type or mode\n", filename);
829
850
/* Block SIGCHLD until process is safely in process list */
830
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
851
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
832
853
perror("sigprocmask");
833
854
exitstatus = EXIT_FAILURE;
881
902
close(pipefd[1]); /* Close unused write end of pipe */
883
904
plugin *new_plugin = getplugin(dirst->d_name);
884
if (new_plugin == NULL){
905
if(new_plugin == NULL){
885
906
perror("getplugin");
886
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
907
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
888
909
perror("sigprocmask");
897
918
/* Unblock SIGCHLD so signal handler can be run if this process
898
919
has already completed */
899
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
920
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
901
922
perror("sigprocmask");
902
923
exitstatus = EXIT_FAILURE;
947
968
if(WIFEXITED(proc->status)){
948
fprintf(stderr, "Plugin %u exited with status %d\n",
949
(unsigned int) (proc->pid),
969
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
970
" %d\n", (intmax_t) (proc->pid),
950
971
WEXITSTATUS(proc->status));
951
972
} else if(WIFSIGNALED(proc->status)) {
952
fprintf(stderr, "Plugin %u killed by signal %d\n",
953
(unsigned int) (proc->pid),
973
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
974
" %d\n", (intmax_t) (proc->pid),
954
975
WTERMSIG(proc->status));
955
976
} else if(WCOREDUMP(proc->status)){
956
fprintf(stderr, "Plugin %d dumped core\n",
957
(unsigned int) (proc->pid));
977
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
978
(intmax_t) (proc->pid));
974
995
proc = next_plugin;
976
997
/* We are done modifying process list, so unblock signal */
977
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
998
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
980
1001
perror("sigprocmask");
981
1002
exitstatus = EXIT_FAILURE;
1010
1031
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1011
1032
proc->buffer = realloc(proc->buffer, proc->buffer_size
1012
1033
+ (size_t) BUFFER_SIZE);
1013
if (proc->buffer == NULL){
1034
if(proc->buffer == NULL){
1014
1035
perror("malloc");
1015
1036
exitstatus = EXIT_FAILURE;
1018
1039
proc->buffer_size += BUFFER_SIZE;
1020
1041
/* Read from the process */
1021
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1042
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1024
1045
/* Read error from this process; ignore the error */
1025
1046
proc = proc->next;
1030
1051
proc->eof = true;
1032
proc->buffer_length += (size_t) ret;
1053
proc->buffer_length += (size_t) sret;