1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
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,
37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
41
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
44
#include <iso646.h> /* and, or, not */
43
45
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
48
fcntl(), setuid(), setgid(),
47
49
F_GETFD, F_SETFD, FD_CLOEXEC,
48
50
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
51
dup2(), STDOUT_FILENO, _exit(),
50
52
execv(), write(), read(),
52
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
54
#include <string.h> /* strsep, strlen(), asprintf() */
56
#include <string.h> /* strsep, strlen(), asprintf(),
55
58
#include <errno.h> /* errno */
56
59
#include <argp.h> /* struct argp_option, struct
57
60
argp_state, struct argp,
61
64
#include <signal.h> /* struct sigaction, sigemptyset(),
62
65
sigaddset(), sigaction(),
63
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
67
SIG_UNBLOCK, kill(), sig_atomic_t
65
69
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
67
72
#define BUFFER_SIZE 256
69
74
#define PDIR "/lib/mandos/plugins.d"
70
75
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
72
const char *argp_program_version = "plugin-runner 1.0";
77
const char *argp_program_version = "plugin-runner " VERSION;
73
78
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
77
80
typedef struct plugin{
78
81
char *name; /* can be NULL or any plugin name */
100
103
or if none is found, creates a new one */
101
104
static plugin *getplugin(char *name){
102
105
/* 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))){
106
for(plugin *p = plugin_list; p != NULL; p = p->next){
108
or (p->name and name and (strcmp(p->name, name) == 0))){
109
112
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
113
plugin *new_plugin = NULL;
115
new_plugin = malloc(sizeof(plugin));
116
} while(new_plugin == NULL and errno == EINTR);
117
if(new_plugin == NULL){
114
120
char *copy_name = NULL;
115
121
if(name != NULL){
116
copy_name = strdup(name);
123
copy_name = strdup(name);
124
} while(copy_name == NULL and errno == EINTR);
117
125
if(copy_name == NULL){
122
*new_plugin = (plugin) { .name = copy_name,
125
.next = plugin_list };
131
*new_plugin = (plugin){ .name = copy_name,
134
.next = plugin_list };
127
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if (new_plugin->argv == NULL){
137
new_plugin->argv = malloc(sizeof(char *) * 2);
138
} while(new_plugin->argv == NULL and errno == EINTR);
139
if(new_plugin->argv == NULL){
130
141
free(new_plugin);
151
164
static bool add_to_char_array(const char *new, char ***array,
153
166
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
168
*array = realloc(*array, sizeof(char *)
169
* (size_t) ((*len) + 2));
170
} while(*array == NULL and errno == EINTR);
156
171
/* Malloc check */
157
172
if(*array == NULL){
160
175
/* Make a copy of the new string */
161
char *copy = strdup(new);
179
} while(copy == NULL and errno == EINTR);
162
180
if(copy == NULL){
207
228
* Based on the example in the GNU LibC manual chapter 13.13 "File
208
229
* Descriptor Flags".
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
230
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
211
static int set_cloexec_flag(int fd)
213
int ret = fcntl(fd, F_GETFD, 0);
232
static int set_cloexec_flag(int fd){
233
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
214
234
/* If reading the flags failed, return error indication now. */
218
238
/* Store modified flag word in the descriptor. */
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
239
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
223
244
/* Mark processes as completed when they exit, and save their exit
225
void handle_sigchld(__attribute__((unused)) int sig){
246
static void handle_sigchld(__attribute__((unused)) int sig){
247
int old_errno = errno;
227
249
plugin *proc = plugin_list;
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
400
error_t parse_opt(int key, char *arg, __attribute__((unused))
401
struct argp_state *state){
379
405
case 'g': /* --global-options */
382
while((p = strsep(&arg, ",")) != NULL){
408
while((plugin_option = strsep(&arg, ",")) != NULL){
409
if(plugin_option[0] == '\0'){
386
if(not add_argument(getplugin(NULL), p)){
412
if(not add_argument(getplugin(NULL), plugin_option)){
387
413
perror("add_argument");
388
414
return ARGP_ERR_UNKNOWN;
398
char *envdef = strdup(arg);
402
if(not add_environment(getplugin(NULL), envdef, true)){
403
perror("add_environment");
423
if(not add_environment(getplugin(NULL), arg, true)){
424
perror("add_environment");
407
427
case 'o': /* --options-for */
409
char *p_name = strsep(&arg, ":");
410
if(p_name[0] == '\0' or arg == NULL){
413
char *opt = strsep(&arg, ":");
414
if(opt[0] == '\0' or opt == NULL){
418
while((p = strsep(&opt, ",")) != NULL){
422
if(not add_argument(getplugin(p_name), p)){
429
char *plugin_name = strsep(&arg, ":");
430
if(plugin_name[0] == '\0'){
434
while((plugin_option = strsep(&arg, ",")) != NULL){
435
if(not add_argument(getplugin(plugin_name), plugin_option)){
423
436
perror("add_argument");
424
437
return ARGP_ERR_UNKNOWN;
435
448
if(envdef == NULL){
438
char *p_name = strndup(arg, (size_t) (envdef-arg));
443
if(not add_environment(getplugin(p_name), envdef, true)){
452
if(not add_environment(getplugin(arg), envdef+1, true)){
444
453
perror("add_environment");
448
457
case 'd': /* --disable */
450
459
plugin *p = getplugin(arg);
452
461
return ARGP_ERR_UNKNOWN;
466
475
case 128: /* --plugin-dir */
467
477
plugindir = strdup(arg);
468
478
if(plugindir == NULL){
469
479
perror("strdup");
472
482
case 129: /* --config-file */
473
483
/* This is already done by parse_opt_config_file() */
475
485
case 130: /* --userid */
476
uid = (uid_t)strtol(arg, NULL, 10);
487
tmpmax = strtoimax(arg, &tmp, 10);
488
if(errno != 0 or tmp == arg or *tmp != '\0'
489
or tmpmax != (uid_t)tmpmax){
490
fprintf(stderr, "Bad user ID number: \"%s\", using %"
491
PRIdMAX "\n", arg, (intmax_t)uid);
478
496
case 131: /* --groupid */
479
gid = (gid_t)strtol(arg, NULL, 10);
498
tmpmax = strtoimax(arg, &tmp, 10);
499
if(errno != 0 or tmp == arg or *tmp != '\0'
500
or tmpmax != (gid_t)tmpmax){
501
fprintf(stderr, "Bad group ID number: \"%s\", using %"
502
PRIdMAX "\n", arg, (intmax_t)gid);
481
507
case 132: /* --debug */
511
* When adding more options before this line, remember to also add a
512
* "case" to the "parse_opt_config_file" function below.
484
514
case ARGP_KEY_ARG:
485
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
515
/* Cryptsetup always passes an argument, which is an empty
516
string if "none" was specified in /etc/crypttab. So if
517
argument was empty, we ignore it silently. */
519
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
487
522
case ARGP_KEY_END:
495
530
/* This option parser is the same as parse_opt() above, except it
496
531
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) {
532
error_t parse_opt_config_file(int key, char *arg,
533
__attribute__((unused))
534
struct argp_state *state){
501
536
case 'g': /* --global-options */
502
537
case 'G': /* --global-env */
503
538
case 'o': /* --options-for */
530
566
.doc = "Mandos plugin runner -- Run plugins" };
532
/* Parse using the parse_opt_config_file in order to get the custom
568
/* Parse using parse_opt_config_file() in order to get the custom
533
569
config file location, if any. */
534
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
535
if (ret == ARGP_ERR_UNKNOWN){
570
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
571
if(ret == ARGP_ERR_UNKNOWN){
536
572
fprintf(stderr, "Unknown error while parsing arguments\n");
537
573
exitstatus = EXIT_FAILURE;
542
578
argp.parser = parse_opt;
544
580
/* Open the configfile if available */
545
if (argfile == NULL){
546
582
conffp = fopen(AFILE, "r");
548
584
conffp = fopen(argfile, "r");
550
586
if(conffp != NULL){
551
587
char *org_line = NULL;
552
588
char *p, *arg, *new_arg, *line;
555
590
const char whitespace_delims[] = " \r\t\f\v\n";
556
591
const char comment_delim[] = "#";
559
594
custom_argv = malloc(sizeof(char*) * 2);
560
595
if(custom_argv == NULL){
599
634
custom_argv[custom_argc-1] = new_arg;
600
custom_argv[custom_argc] = NULL;
635
custom_argv[custom_argc] = NULL;
639
ret = fclose(conffp);
640
} while(ret == EOF and errno == EINTR);
643
exitstatus = EXIT_FAILURE;
605
648
/* Check for harmful errors and go to fallback. Other errors might
606
649
not affect opening plugins */
607
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
650
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
609
652
exitstatus = EXIT_FAILURE;
613
656
/* If there was any arguments from configuration file,
614
657
pass them to parser as command arguments */
615
658
if(custom_argv != NULL){
616
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
618
if (ret == ARGP_ERR_UNKNOWN){
659
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
661
if(ret == ARGP_ERR_UNKNOWN){
619
662
fprintf(stderr, "Unknown error while parsing arguments\n");
620
663
exitstatus = EXIT_FAILURE;
625
668
/* 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){
670
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
671
if(ret == ARGP_ERR_UNKNOWN){
629
672
fprintf(stderr, "Unknown error while parsing arguments\n");
630
673
exitstatus = EXIT_FAILURE;
638
681
for(char **a = p->argv; *a != NULL; a++){
639
682
fprintf(stderr, "\tArg: %s\n", *a);
641
fprintf(stderr, "...and %u environment variables\n", p->envc);
684
fprintf(stderr, "...and %d environment variables\n", p->envc);
642
685
for(char **a = p->environ; *a != NULL; a++){
643
686
fprintf(stderr, "\t%s\n", *a);
745
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
791
if(plugindir == NULL){
792
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
795
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
747
800
perror("asprintf");
751
ret = stat(filename, &st);
804
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
758
811
/* Ignore non-executable files */
759
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
812
if(not S_ISREG(st.st_mode)
813
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
761
815
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
762
816
" with bad type or mode\n", filename);
830
884
/* Block SIGCHLD until process is safely in process list */
831
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
885
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
886
&sigchld_action.sa_mask,
833
889
perror("sigprocmask");
834
890
exitstatus = EXIT_FAILURE;
837
893
/* Starting a new process to be watched */
897
} while(pid == -1 and errno == EINTR);
841
900
exitstatus = EXIT_FAILURE;
881
940
/* Parent process */
882
close(pipefd[1]); /* Close unused write end of pipe */
941
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
884
944
plugin *new_plugin = getplugin(dirst->d_name);
885
if (new_plugin == NULL){
945
if(new_plugin == NULL){
886
946
perror("getplugin");
887
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
947
ret = (int)(TEMP_FAILURE_RETRY
948
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
889
951
perror("sigprocmask");
925
989
free_plugin_list();
929
993
/* Main loop while running plugins exist */
930
994
while(plugin_list){
931
995
fd_set rfds = rfds_all;
932
996
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
933
if (select_ret == -1){
997
if(select_ret == -1 and errno != EINTR){
934
998
perror("select");
935
999
exitstatus = EXIT_FAILURE;
938
1002
/* OK, now either a process completed, or something can be read
939
1003
from one of them */
940
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1004
for(plugin *proc = plugin_list; proc != NULL;){
941
1005
/* Is this process completely done? */
942
if(proc->eof and proc->completed){
1006
if(proc->completed and proc->eof){
943
1007
/* Only accept the plugin output if it exited cleanly */
944
1008
if(not WIFEXITED(proc->status)
945
1009
or WEXITSTATUS(proc->status) != 0){
946
1010
/* Bad exit by plugin */
949
1013
if(WIFEXITED(proc->status)){
950
fprintf(stderr, "Plugin %u exited with status %d\n",
951
(unsigned int) (proc->pid),
1014
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1015
" status %d\n", proc->name,
1016
(intmax_t) (proc->pid),
952
1017
WEXITSTATUS(proc->status));
953
} else if(WIFSIGNALED(proc->status)) {
954
fprintf(stderr, "Plugin %u killed by signal %d\n",
955
(unsigned int) (proc->pid),
956
WTERMSIG(proc->status));
1018
} else if(WIFSIGNALED(proc->status)){
1019
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1020
" signal %d: %s\n", proc->name,
1021
(intmax_t) (proc->pid),
1022
WTERMSIG(proc->status),
1023
strsignal(WTERMSIG(proc->status)));
957
1024
} else if(WCOREDUMP(proc->status)){
958
fprintf(stderr, "Plugin %d dumped core\n",
959
(unsigned int) (proc->pid));
1025
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1026
" core\n", proc->name, (intmax_t) (proc->pid));
963
1030
/* Remove the plugin */
964
1031
FD_CLR(proc->fd, &rfds_all);
966
1033
/* Block signal while modifying process_list */
967
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1034
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1036
&sigchld_action.sa_mask,
969
1039
perror("sigprocmask");
970
1040
exitstatus = EXIT_FAILURE;
1044
plugin *next_plugin = proc->next;
973
1045
free_plugin(proc);
974
1048
/* We are done modifying process list, so unblock signal */
975
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
1049
ret = (int)(TEMP_FAILURE_RETRY
1050
(sigprocmask(SIG_UNBLOCK,
1051
&sigchld_action.sa_mask, NULL)));
978
1053
perror("sigprocmask");
979
1054
exitstatus = EXIT_FAILURE;
1000
1076
/* This process has not completed. Does it have any output? */
1001
1077
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1002
1078
/* This process had nothing to say at this time */
1005
1082
/* Before reading, make the process' data buffer large enough */
1006
1083
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1007
1084
proc->buffer = realloc(proc->buffer, proc->buffer_size
1008
1085
+ (size_t) BUFFER_SIZE);
1009
if (proc->buffer == NULL){
1086
if(proc->buffer == NULL){
1010
1087
perror("malloc");
1011
1088
exitstatus = EXIT_FAILURE;
1014
1091
proc->buffer_size += BUFFER_SIZE;
1016
1093
/* Read from the process */
1017
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1094
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1096
+ proc->buffer_length,
1020
1099
/* Read error from this process; ignore the error */
1025
1105
proc->eof = true;
1027
proc->buffer_length += (size_t) ret;
1107
proc->buffer_length += (size_t) sret;
1035
1115
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){