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
7
* This program is free software: you can redistribute it and/or
8
* modify it under the terms of the GNU General Public License as
9
* published by the Free Software Foundation, either version 3 of the
10
* License, or (at your option) any later version.
12
* This program is distributed in the hope that it will be useful, but
5
* Copyright © 2008-2020 Teddy Hogeborn
6
* Copyright © 2008-2020 Björn Påhlsson
8
* This file is part of Mandos.
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
15
* Mandos is distributed in the hope that it will be useful, but
13
16
* WITHOUT ANY WARRANTY; without even the implied warranty of
14
17
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15
18
* General Public License for more details.
17
20
* You should have received a copy of the GNU General Public License
18
* along with this program. If not, see
19
* <http://www.gnu.org/licenses/>.
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
* Contact the authors at <mandos@recompile.se>.
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
#define _GNU_SOURCE /* strchrnul(), TEMP_FAILURE_RETRY(),
27
getline(), asprintf(), O_CLOEXEC,
28
scandirat(), pipe2() */
29
#include <argp.h> /* argp_program_version,
30
argp_program_bug_address,
32
struct argp_state, argp_error(),
33
ARGP_NO_EXIT, argp_state_help,
35
ARGP_HELP_USAGE, ARGP_HELP_EXIT_OK,
36
ARGP_KEY_ARG, ARGP_ERR_UNKNOWN,
37
struct argp, argp_parse(),
38
ARGP_IN_ORDER, ARGP_NO_HELP */
39
#include <stdbool.h> /* bool, false, true */
40
#include <sys/types.h> /* pid_t, sig_atomic_t, uid_t, gid_t,
41
getuid(), setgid(), setuid() */
26
42
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
29
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
FD_SET(), FD_ISSET(), FD_CLR */
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
43
#include <iso646.h> /* or, and, not */
44
#include <string.h> /* strcmp(), strdup(), strchrnul(),
45
strncmp(), strlen(), strcpy(),
46
strsep(), strchr(), strsignal() */
47
#include <stdlib.h> /* malloc(), free(), reallocarray(),
48
realloc(), EXIT_SUCCESS */
49
#include <errno.h> /* errno, EINTR, ENOMEM, ECHILD,
50
error_t, EINVAL, EMFILE, ENFILE,
52
#include <stdint.h> /* SIZE_MAX */
53
#define _GNU_SOURCE /* strchrnul(), TEMP_FAILURE_RETRY(),
54
getline(), asprintf(), O_CLOEXEC,
55
scandirat(), pipe2() */
56
#include <unistd.h> /* TEMP_FAILURE_RETRY(), ssize_t,
57
write(), STDOUT_FILENO, uid_t,
58
gid_t, getuid(), fchown(), close(),
59
symlink(), setgid(), setuid(),
60
faccessat(), X_OK, pipe(), pipe2(),
61
fork(), _exit(), dup2(), fexecve(),
52
63
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
54
#include <string.h> /* strsep, strlen(), asprintf() */
55
#include <errno.h> /* errno */
56
#include <argp.h> /* struct argp_option, struct
57
argp_state, struct argp,
58
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG,
61
#include <signal.h> /* struct sigaction, sigemptyset(),
62
sigaddset(), sigaction(),
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
65
#include <errno.h> /* errno, EBADF */
64
FD_CLOEXEC, open(), O_RDONLY,
65
O_CLOEXEC, openat() */
66
#include <sys/wait.h> /* waitpid(), WNOHANG, WIFEXITED(),
67
WEXITSTATUS(), WIFSIGNALED(),
69
#include <error.h> /* error() */
70
#include <stdio.h> /* FILE, fprintf(), fopen(),
71
getline(), fclose(), EOF,
73
#include <dirent.h> /* struct dirent, scandirat(),
75
#include <sys/stat.h> /* struct stat, fstat(), S_ISDIR(),
77
#include <sys/select.h> /* fd_set, FD_ZERO(), FD_SETSIZE,
78
FD_SET(), select(), FD_CLR(),
80
#include <signal.h> /* struct sigaction, SA_NOCLDSTOP,
81
sigemptyset(), sigaddset(),
82
SIGCHLD, sigprocmask(), SIG_BLOCK,
83
SIG_UNBLOCK, kill(), SIGTERM */
84
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
85
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
86
#include <inttypes.h> /* intmax_t, strtoimax(), PRIdMAX */
87
#include <fnmatch.h> /* fnmatch(), FNM_FILE_NAME,
88
FNM_PERIOD, FNM_NOMATCH */
67
90
#define BUFFER_SIZE 256
69
92
#define PDIR "/lib/mandos/plugins.d"
93
#define PHDIR "/lib/mandos/plugin-helpers"
70
94
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
72
const char *argp_program_version = "plugin-runner 1.0";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
96
const char *argp_program_version = "plugin-runner " VERSION;
97
const char *argp_program_bug_address = "<mandos@recompile.se>";
77
99
typedef struct plugin{
78
100
char *name; /* can be NULL or any plugin name */
370
442
.doc = "Group ID the plugins will run as", .group = 3 },
371
443
{ .name = "debug", .key = 132,
372
444
.doc = "Debug mode", .group = 4 },
445
{ .name = "plugin-helper-dir", .key = 133,
447
.doc = "Specify a different plugin helper directory",
450
* These reproduce what we would get without ARGP_NO_HELP
452
{ .name = "help", .key = '?',
453
.doc = "Give this help list", .group = -1 },
454
{ .name = "usage", .key = -3,
455
.doc = "Give a short usage message", .group = -1 },
456
{ .name = "version", .key = 'V',
457
.doc = "Print program version", .group = -1 },
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
461
__attribute__((nonnull(3)))
462
error_t parse_opt(int key, char *arg, struct argp_state *state){
379
467
case 'g': /* --global-options */
382
while((p = strsep(&arg, ",")) != NULL){
386
if(not add_argument(getplugin(NULL), p)){
387
perror("add_argument");
388
return ARGP_ERR_UNKNOWN;
470
while((plugin_option = strsep(&arg, ",")) != NULL){
471
if(not add_argument(getplugin(NULL), plugin_option)){
393
478
case 'G': /* --global-env */
398
char *envdef = strdup(arg);
402
if(not add_environment(getplugin(NULL), envdef, true)){
403
perror("add_environment");
479
if(add_environment(getplugin(NULL), arg, true)){
407
483
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)){
423
perror("add_argument");
424
return ARGP_ERR_UNKNOWN;
485
char *option_list = strchr(arg, ':');
486
if(option_list == NULL){
487
argp_error(state, "No colon in \"%s\"", arg);
494
argp_error(state, "Empty plugin name");
499
while((option = strsep(&option_list, ",")) != NULL){
500
if(not add_argument(getplugin(arg), option)){
429
507
case 'E': /* --env-for */
434
509
char *envdef = strchr(arg, ':');
435
510
if(envdef == NULL){
438
char *p_name = strndup(arg, (size_t) (envdef-arg));
511
argp_error(state, "No colon in \"%s\"", arg);
443
if(not add_environment(getplugin(p_name), envdef, true)){
444
perror("add_environment");
518
argp_error(state, "Empty plugin name");
522
if(add_environment(getplugin(arg), envdef, true)){
448
527
case 'd': /* --disable */
450
529
plugin *p = getplugin(arg);
452
return ARGP_ERR_UNKNOWN;
457
536
case 'e': /* --enable */
459
538
plugin *p = getplugin(arg);
461
return ARGP_ERR_UNKNOWN;
466
545
case 128: /* --plugin-dir */
467
547
plugindir = strdup(arg);
468
if(plugindir == NULL){
548
if(plugindir != NULL){
472
552
case 129: /* --config-file */
473
553
/* This is already done by parse_opt_config_file() */
475
555
case 130: /* --userid */
476
uid = (uid_t)strtol(arg, NULL, 10);
556
tmp_id = strtoimax(arg, &tmp, 10);
557
if(errno != 0 or tmp == arg or *tmp != '\0'
558
or tmp_id != (uid_t)tmp_id){
559
argp_error(state, "Bad user ID number: \"%s\", using %"
560
PRIdMAX, arg, (intmax_t)uid);
478
566
case 131: /* --groupid */
479
gid = (gid_t)strtol(arg, NULL, 10);
567
tmp_id = strtoimax(arg, &tmp, 10);
568
if(errno != 0 or tmp == arg or *tmp != '\0'
569
or tmp_id != (gid_t)tmp_id){
570
argp_error(state, "Bad group ID number: \"%s\", using %"
571
PRIdMAX, arg, (intmax_t)gid);
481
577
case 132: /* --debug */
580
case 133: /* --plugin-helper-dir */
581
free(pluginhelperdir);
582
pluginhelperdir = strdup(arg);
583
if(pluginhelperdir != NULL){
588
* These reproduce what we would get without ARGP_NO_HELP
590
case '?': /* --help */
591
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
592
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
593
__builtin_unreachable();
594
case -3: /* --usage */
595
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
596
argp_state_help(state, state->out_stream,
597
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
598
__builtin_unreachable();
599
case 'V': /* --version */
600
fprintf(state->out_stream, "%s\n", argp_program_version);
604
* When adding more options before this line, remember to also add a
605
* "case" to the "parse_opt_config_file" function below.
484
607
case ARGP_KEY_ARG:
485
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
608
/* Cryptsetup always passes an argument, which is an empty
609
string if "none" was specified in /etc/crypttab. So if
610
argument was empty, we ignore it silently. */
615
__attribute__((fallthrough));
490
620
return ARGP_ERR_UNKNOWN;
622
return errno; /* Set to 0 at start */
495
625
/* This option parser is the same as parse_opt() above, except it
496
626
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) {
627
error_t parse_opt_config_file(int key, char *arg,
628
__attribute__((unused))
629
struct argp_state *state){
501
632
case 'g': /* --global-options */
502
633
case 'G': /* --global-env */
503
634
case 'o': /* --options-for */
582
726
new_arg = strdup(p);
583
727
if(new_arg == NULL){
585
exitstatus = EXIT_FAILURE;
728
error(0, errno, "strdup");
729
exitstatus = EX_OSERR;
590
734
custom_argc += 1;
591
custom_argv = realloc(custom_argv, sizeof(char *)
592
* ((unsigned int) custom_argc + 1));
593
if(custom_argv == NULL){
595
exitstatus = EXIT_FAILURE;
736
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
737
char **new_argv = reallocarray(custom_argv, (size_t)custom_argc + 1,
740
char **new_argv = NULL;
741
if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
745
new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
749
if(new_argv == NULL){
750
error(0, errno, "reallocarray");
751
exitstatus = EX_OSERR;
756
custom_argv = new_argv;
599
759
custom_argv[custom_argc-1] = new_arg;
600
custom_argv[custom_argc] = NULL;
760
custom_argv[custom_argc] = NULL;
764
ret = fclose(conffp);
765
} while(ret == EOF and errno == EINTR);
767
error(0, errno, "fclose");
768
exitstatus = EX_IOERR;
605
773
/* Check for harmful errors and go to fallback. Other errors might
606
774
not affect opening plugins */
607
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
609
exitstatus = EXIT_FAILURE;
775
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
776
error(0, errno, "fopen");
777
exitstatus = EX_OSERR;
613
/* If there was any arguments from configuration file,
614
pass them to parser as command arguments */
781
/* If there were any arguments from the configuration file, pass
782
them to parser as command line arguments */
615
783
if(custom_argv != NULL){
616
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
618
if (ret == ARGP_ERR_UNKNOWN){
619
fprintf(stderr, "Unknown error while parsing arguments\n");
620
exitstatus = EXIT_FAILURE;
784
ret = argp_parse(&argp, custom_argc, custom_argv,
785
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
793
error(0, errno, "argp_parse");
794
exitstatus = EX_OSERR;
797
exitstatus = EX_CONFIG;
625
802
/* 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){
629
fprintf(stderr, "Unknown error while parsing arguments\n");
630
exitstatus = EXIT_FAILURE;
804
ret = argp_parse(&argp, argc, argv,
805
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
813
error(0, errno, "argp_parse");
814
exitstatus = EX_OSERR;
817
exitstatus = EX_USAGE;
822
char *pluginhelperenv;
824
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
825
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
827
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
829
if(ret == -1 or not bret){
830
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
831
" environment variable to \"%s\" for all plugins\n",
832
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
835
free(pluginhelperenv);
635
for(plugin *p = plugin_list; p != NULL; p=p->next){
840
for(plugin *p = plugin_list; p != NULL; p = p->next){
636
841
fprintf(stderr, "Plugin: %s has %d arguments\n",
637
842
p->name ? p->name : "Global", p->argc - 1);
638
843
for(char **a = p->argv; *a != NULL; a++){
639
844
fprintf(stderr, "\tArg: %s\n", *a);
641
fprintf(stderr, "...and %u environment variables\n", p->envc);
846
fprintf(stderr, "...and %d environment variables\n", p->envc);
642
847
for(char **a = p->environ; *a != NULL; a++){
643
848
fprintf(stderr, "\t%s\n", *a);
648
/* Strip permissions down to nobody */
854
/* Work around Debian bug #633582:
855
<https://bugs.debian.org/633582> */
856
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
857
if(plugindir_fd == -1){
859
error(0, errno, "open(\"" PDIR "\")");
862
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
864
error(0, errno, "fstat");
866
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
867
ret = fchown(plugindir_fd, uid, gid);
869
error(0, errno, "fchown");
876
/* Work around Debian bug #981302
877
<https://bugs.debian.org/981302> */
878
if(lstat("/dev/fd", &st) != 0 and errno == ENOENT){
879
ret = symlink("/proc/self/fd", "/dev/fd");
881
error(0, errno, "Failed to create /dev/fd symlink");
886
/* Lower permissions */
889
error(0, errno, "setgid");
649
891
ret = setuid(uid);
658
if (plugindir == NULL){
661
dir = opendir(plugindir);
665
perror("Could not open plugin dir");
666
exitstatus = EXIT_FAILURE;
670
/* Set the FD_CLOEXEC flag on the directory, if possible */
893
error(0, errno, "setuid");
896
/* Open plugin directory with close_on_exec flag */
672
int dir_fd = dirfd(dir);
674
ret = set_cloexec_flag(dir_fd);
676
perror("set_cloexec_flag");
677
exitstatus = EXIT_FAILURE;
898
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
901
#else /* not O_CLOEXEC */
903
#endif /* not O_CLOEXEC */
906
error(0, errno, "Could not open plugin dir");
907
exitstatus = EX_UNAVAILABLE;
912
/* Set the FD_CLOEXEC flag on the directory */
913
ret = set_cloexec_flag(dir_fd);
915
error(0, errno, "set_cloexec_flag");
916
exitstatus = EX_OSERR;
919
#endif /* O_CLOEXEC */
922
int good_name(const struct dirent * const dirent){
923
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
924
"*.dpkg-old", "*.dpkg-bak",
925
"*.dpkg-divert", NULL };
927
#pragma GCC diagnostic push
928
#pragma GCC diagnostic ignored "-Wcast-qual"
930
for(const char **pat = (const char **)patterns;
931
*pat != NULL; pat++){
933
#pragma GCC diagnostic pop
935
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
938
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
939
" matching pattern %s\n", dirent->d_name, *pat);
947
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
949
if(numplugins == -1){
950
error(0, errno, "Could not scan plugin dir");
952
exitstatus = EX_OSERR;
683
956
FD_ZERO(&rfds_all);
685
958
/* Read and execute any executable in the plugin directory*/
687
dirst = readdir(dir);
689
/* All directory entries have been processed */
693
exitstatus = EXIT_FAILURE;
699
d_name_len = strlen(dirst->d_name);
701
/* Ignore dotfiles, backup files and other junk */
703
bool bad_name = false;
705
const char const *bad_prefixes[] = { ".", "#", NULL };
707
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
709
".dpkg-divert", NULL };
710
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
711
size_t pre_len = strlen(*pre);
712
if((d_name_len >= pre_len)
713
and strncmp((dirst->d_name), *pre, pre_len) == 0){
715
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
716
" with bad prefix %s\n", dirst->d_name, *pre);
725
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
726
size_t suf_len = strlen(*suf);
727
if((d_name_len >= suf_len)
728
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
731
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
732
" with bad suffix %s\n", dirst->d_name, *suf);
745
if(plugindir == NULL){
746
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
748
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
755
ret = stat(filename, &st);
959
for(int i = 0; i < numplugins; i++){
961
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
963
error(0, errno, "Could not open plugin");
967
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
969
error(0, errno, "stat");
762
975
/* Ignore non-executable files */
763
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
976
if(not S_ISREG(st.st_mode)
977
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
765
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
766
" with bad type or mode\n", filename);
980
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
981
" with bad type or mode\n",
982
plugindir != NULL ? plugindir : PDIR,
983
direntries[i]->d_name);
772
plugin *p = getplugin(dirst->d_name);
990
plugin *p = getplugin(direntries[i]->d_name);
992
error(0, errno, "getplugin");
780
999
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
1000
direntries[i]->d_name);
1003
free(direntries[i]);
790
1010
for(char **a = g->argv + 1; *a != NULL; a++){
791
1011
if(not add_argument(p, *a)){
792
perror("add_argument");
1012
error(0, errno, "add_argument");
795
1015
/* Add global environment variables */
796
1016
for(char **e = g->environ; *e != NULL; e++){
797
1017
if(not add_environment(p, *e, false)){
798
perror("add_environment");
1018
error(0, errno, "add_environment");
803
/* If this plugin has any environment variables, we will call
804
using execve and need to duplicate the environment from this
1023
/* If this plugin has any environment variables, we need to
1024
duplicate the environment from this process, too. */
806
1025
if(p->environ[0] != NULL){
807
1026
for(char **e = environ; *e != NULL; e++){
808
1027
if(not add_environment(p, *e, false)){
809
perror("add_environment");
1028
error(0, errno, "add_environment");
818
exitstatus = EXIT_FAILURE;
1035
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1036
#else /* O_CLOEXEC */
1037
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
1038
#endif /* O_CLOEXEC */
1040
error(0, errno, "pipe");
1041
exitstatus = EX_OSERR;
1042
free(direntries[i]);
1045
if(pipefd[0] >= FD_SETSIZE){
1046
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1050
exitstatus = EX_OSERR;
1051
free(direntries[i]);
821
1055
/* Ask OS to automatic close the pipe on exec */
822
1056
ret = set_cloexec_flag(pipefd[0]);
824
perror("set_cloexec_flag");
825
exitstatus = EXIT_FAILURE;
1058
error(0, errno, "set_cloexec_flag");
1061
exitstatus = EX_OSERR;
1062
free(direntries[i]);
828
1065
ret = set_cloexec_flag(pipefd[1]);
830
perror("set_cloexec_flag");
831
exitstatus = EXIT_FAILURE;
1067
error(0, errno, "set_cloexec_flag");
1070
exitstatus = EX_OSERR;
1071
free(direntries[i]);
1074
#endif /* not O_CLOEXEC */
834
1075
/* Block SIGCHLD until process is safely in process list */
835
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1076
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1077
&sigchld_action.sa_mask,
837
perror("sigprocmask");
838
exitstatus = EXIT_FAILURE;
1080
error(0, errno, "sigprocmask");
1081
exitstatus = EX_OSERR;
1082
free(direntries[i]);
841
1085
/* Starting a new process to be watched */
1089
} while(pid == -1 and errno == EINTR);
845
exitstatus = EXIT_FAILURE;
1091
error(0, errno, "fork");
1092
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1093
&sigchld_action.sa_mask, NULL));
1096
exitstatus = EX_OSERR;
1097
free(direntries[i]);
849
1101
/* this is the child process */
850
1102
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1104
error(0, errno, "sigaction");
855
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1107
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
857
perror("sigprocmask");
1109
error(0, errno, "sigprocmask");
861
1113
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1115
error(0, errno, "dup2");
868
/* If dir has no file descriptor, we could not set FD_CLOEXEC
869
above and must now close it manually here. */
872
if(p->environ[0] == NULL){
873
if(execv(filename, p->argv) < 0){
878
if(execve(filename, p->argv, p->environ) < 0){
1119
if(fexecve(plugin_fd, p->argv,
1120
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1121
error(0, errno, "fexecve for %s/%s",
1122
plugindir != NULL ? plugindir : PDIR,
1123
direntries[i]->d_name);
885
1128
/* Parent process */
886
1129
close(pipefd[1]); /* Close unused write end of pipe */
888
plugin *new_plugin = getplugin(dirst->d_name);
889
if (new_plugin == NULL){
891
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1131
plugin *new_plugin = getplugin(direntries[i]->d_name);
1132
if(new_plugin == NULL){
1133
error(0, errno, "getplugin");
1134
ret = (int)(TEMP_FAILURE_RETRY
1135
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
893
perror("sigprocmask");
1138
error(0, errno, "sigprocmask");
895
exitstatus = EXIT_FAILURE;
1140
exitstatus = EX_OSERR;
1141
free(direntries[i]);
1144
free(direntries[i]);
899
1146
new_plugin->pid = pid;
900
1147
new_plugin->fd = pipefd[0];
1150
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1151
new_plugin->name, (intmax_t) (new_plugin->pid));
902
1154
/* Unblock SIGCHLD so signal handler can be run if this process
903
1155
has already completed */
904
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1156
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1157
&sigchld_action.sa_mask,
906
perror("sigprocmask");
907
exitstatus = EXIT_FAILURE;
1160
error(0, errno, "sigprocmask");
1161
exitstatus = EX_OSERR;
911
1165
FD_SET(new_plugin->fd, &rfds_all);
913
if (maxfd < new_plugin->fd){
1167
if(maxfd < new_plugin->fd){
914
1168
maxfd = new_plugin->fd;
1176
free_plugin(getplugin(NULL));
922
1178
for(plugin *p = plugin_list; p != NULL; p = p->next){
923
1179
if(p->pid != 0){
929
1185
free_plugin_list();
933
1189
/* Main loop while running plugins exist */
934
1190
while(plugin_list){
935
1191
fd_set rfds = rfds_all;
936
1192
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
937
if (select_ret == -1){
939
exitstatus = EXIT_FAILURE;
1193
if(select_ret == -1 and errno != EINTR){
1194
error(0, errno, "select");
1195
exitstatus = EX_OSERR;
942
1198
/* OK, now either a process completed, or something can be read
943
1199
from one of them */
944
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1200
for(plugin *proc = plugin_list; proc != NULL;){
945
1201
/* Is this process completely done? */
946
if(proc->eof and proc->completed){
1202
if(proc->completed and proc->eof){
947
1203
/* Only accept the plugin output if it exited cleanly */
948
1204
if(not WIFEXITED(proc->status)
949
1205
or WEXITSTATUS(proc->status) != 0){
950
1206
/* Bad exit by plugin */
953
1209
if(WIFEXITED(proc->status)){
954
fprintf(stderr, "Plugin %u exited with status %d\n",
955
(unsigned int) (proc->pid),
1210
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1211
" status %d\n", proc->name,
1212
(intmax_t) (proc->pid),
956
1213
WEXITSTATUS(proc->status));
957
} else if(WIFSIGNALED(proc->status)) {
958
fprintf(stderr, "Plugin %u killed by signal %d\n",
959
(unsigned int) (proc->pid),
960
WTERMSIG(proc->status));
961
} else if(WCOREDUMP(proc->status)){
962
fprintf(stderr, "Plugin %d dumped core\n",
963
(unsigned int) (proc->pid));
1214
} else if(WIFSIGNALED(proc->status)){
1215
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1216
" signal %d: %s\n", proc->name,
1217
(intmax_t) (proc->pid),
1218
WTERMSIG(proc->status),
1219
strsignal(WTERMSIG(proc->status)));
967
1223
/* Remove the plugin */
968
1224
FD_CLR(proc->fd, &rfds_all);
970
1226
/* Block signal while modifying process_list */
971
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1227
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1229
&sigchld_action.sa_mask,
973
perror("sigprocmask");
974
exitstatus = EXIT_FAILURE;
1232
error(0, errno, "sigprocmask");
1233
exitstatus = EX_OSERR;
1237
plugin *next_plugin = proc->next;
977
1238
free_plugin(proc);
978
1241
/* We are done modifying process list, so unblock signal */
979
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
1242
ret = (int)(TEMP_FAILURE_RETRY
1243
(sigprocmask(SIG_UNBLOCK,
1244
&sigchld_action.sa_mask, NULL)));
982
perror("sigprocmask");
983
exitstatus = EXIT_FAILURE;
1246
error(0, errno, "sigprocmask");
1247
exitstatus = EX_OSERR;
987
1251
if(plugin_list == NULL){
993
1258
/* This process exited nicely, so print its buffer */
995
1260
bool bret = print_out_password(proc->buffer,
996
1261
proc->buffer_length);
998
perror("print_out_password");
999
exitstatus = EXIT_FAILURE;
1263
error(0, errno, "print_out_password");
1264
exitstatus = EX_IOERR;