1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
3
3
* Mandos plugin runner - Run Mandos plugins
5
* Copyright © 2008-2022 Teddy Hogeborn
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* Copyright © 2008-2022 Björn Påhlsson
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* This file is part of Mandos.
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* Mandos is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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* Mandos is distributed in the hope that it will be useful, but
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* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
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* 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
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* License, or (at your option) any later version.
12
* This program is distributed in the hope that it will be useful, but
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13
* WITHOUT ANY WARRANTY; without even the implied warranty of
17
14
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18
15
* General Public License for more details.
20
17
* You should have received a copy of the GNU General Public License
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
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* along with this program. If not, see
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* <http://www.gnu.org/licenses/>.
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* Contact the authors at <mandos@recompile.se>.
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* Contact the authors at <mandos@fukt.bsnet.se>.
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#define _GNU_SOURCE /* strchrnul(), TEMP_FAILURE_RETRY(),
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getline(), asprintf(), O_CLOEXEC,
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scandirat(), pipe2() */
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#include <argp.h> /* argp_program_version,
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argp_program_bug_address,
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struct argp_state, argp_error(),
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ARGP_NO_EXIT, argp_state_help,
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ARGP_HELP_USAGE, ARGP_HELP_EXIT_OK,
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ARGP_KEY_ARG, ARGP_ERR_UNKNOWN,
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struct argp, argp_parse(),
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ARGP_IN_ORDER, ARGP_NO_HELP */
39
#include <stdbool.h> /* bool, false, true */
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#include <sys/types.h> /* pid_t, sig_atomic_t, uid_t, gid_t,
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getuid(), setgid(), setuid() */
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
42
26
#include <stddef.h> /* size_t, NULL */
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#include <iso646.h> /* or, and, not */
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#include <string.h> /* strcmp(), strdup(), strchrnul(),
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strncmp(), strlen(), strcpy(),
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strsep(), strchr(), strsignal() */
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#include <stdlib.h> /* malloc(), free(), reallocarray(),
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realloc(), EXIT_SUCCESS */
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#include <errno.h> /* errno, EINTR, ENOMEM, ECHILD,
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error_t, EINVAL, EMFILE, ENFILE,
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#include <stdint.h> /* SIZE_MAX */
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#define _GNU_SOURCE /* strchrnul(), TEMP_FAILURE_RETRY(),
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getline(), asprintf(), O_CLOEXEC,
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scandirat(), pipe2() */
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#include <unistd.h> /* TEMP_FAILURE_RETRY(), ssize_t,
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write(), STDOUT_FILENO, uid_t,
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gid_t, getuid(), fchown(), close(),
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symlink(), setgid(), setuid(),
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faccessat(), X_OK, pipe(), pipe2(),
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fork(), _exit(), dup2(), fexecve(),
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
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EXIT_SUCCESS, realloc() */
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#include <stdbool.h> /* bool, true, false */
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#include <stdio.h> /* perror, popen(), fileno(),
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fprintf(), stderr, STDOUT_FILENO */
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#include <sys/types.h> /* DIR, opendir(), stat(), struct
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stat, waitpid(), WIFEXITED(),
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WEXITSTATUS(), wait(), pid_t,
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uid_t, gid_t, getuid(), getgid(),
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#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
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FD_SET(), FD_ISSET(), FD_CLR */
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#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
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#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
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#include <iso646.h> /* and, or, not */
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#include <dirent.h> /* DIR, struct dirent, opendir(),
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readdir(), closedir(), dirfd() */
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#include <unistd.h> /* struct stat, stat(), S_ISREG(),
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fcntl(), setuid(), setgid(),
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F_GETFD, F_SETFD, FD_CLOEXEC,
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access(), pipe(), fork(), close()
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dup2, STDOUT_FILENO, _exit(),
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execv(), write(), read(),
63
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
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FD_CLOEXEC, open(), O_RDONLY,
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O_CLOEXEC, openat() */
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#include <sys/wait.h> /* waitpid(), WNOHANG, WIFEXITED(),
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WEXITSTATUS(), WIFSIGNALED(),
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#include <error.h> /* error() */
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#include <stdio.h> /* FILE, fprintf(), fopen(),
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getline(), fclose(), EOF,
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#include <dirent.h> /* struct dirent, scandirat(),
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#include <sys/stat.h> /* struct stat, fstat(), S_ISDIR(),
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#include <sys/select.h> /* fd_set, FD_ZERO(), FD_SETSIZE,
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FD_SET(), select(), FD_CLR(),
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#include <signal.h> /* struct sigaction, SA_NOCLDSTOP,
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sigemptyset(), sigaddset(),
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SIGCHLD, sigprocmask(), SIG_BLOCK,
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SIG_UNBLOCK, kill(), SIGTERM */
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#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
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EX_CONFIG, EX_UNAVAILABLE, EX_OK */
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#include <inttypes.h> /* intmax_t, strtoimax(), PRIdMAX */
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#include <fnmatch.h> /* fnmatch(), FNM_FILE_NAME,
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FNM_PERIOD, FNM_NOMATCH */
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#include <string.h> /* strsep, strlen(), asprintf() */
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#include <errno.h> /* errno */
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#include <argp.h> /* struct argp_option, struct
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argp_state, struct argp,
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argp_parse(), ARGP_ERR_UNKNOWN,
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ARGP_KEY_END, ARGP_KEY_ARG,
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#include <signal.h> /* struct sigaction, sigemptyset(),
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sigaddset(), sigaction(),
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sigprocmask(), SIG_BLOCK, SIGCHLD,
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SIG_UNBLOCK, kill() */
65
#include <errno.h> /* errno, EBADF */
90
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#define BUFFER_SIZE 256
92
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#define PDIR "/lib/mandos/plugins.d"
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#define PHDIR "/lib/mandos/plugin-helpers"
94
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
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const char *argp_program_version = "plugin-runner " VERSION;
97
const char *argp_program_bug_address = "<mandos@recompile.se>";
72
const char *argp_program_version = "plugin-runner 1.0";
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const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
99
77
typedef struct plugin{
100
78
char *name; /* can be NULL or any plugin name */
442
370
.doc = "Group ID the plugins will run as", .group = 3 },
443
371
{ .name = "debug", .key = 132,
444
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.doc = "Debug mode", .group = 4 },
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{ .name = "plugin-helper-dir", .key = 133,
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.doc = "Specify a different plugin helper directory",
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* 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 },
461
__attribute__((nonnull(3)))
462
error_t parse_opt(int key, char *arg, struct argp_state *state){
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
467
379
case 'g': /* --global-options */
470
while((plugin_option = strsep(&arg, ",")) != NULL){
471
if(not add_argument(getplugin(NULL), plugin_option)){
382
while((p = strsep(&arg, ",")) != NULL){
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if(not add_argument(getplugin(NULL), p)){
387
perror("add_argument");
388
return ARGP_ERR_UNKNOWN;
478
393
case 'G': /* --global-env */
479
if(add_environment(getplugin(NULL), arg, true)){
398
char *envdef = strdup(arg);
402
if(not add_environment(getplugin(NULL), envdef, true)){
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perror("add_environment");
483
407
case 'o': /* --options-for */
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)){
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;
507
429
case 'E': /* --env-for */
509
434
char *envdef = strchr(arg, ':');
510
435
if(envdef == NULL){
511
argp_error(state, "No colon in \"%s\"", arg);
438
char *p_name = strndup(arg, (size_t) (envdef-arg));
518
argp_error(state, "Empty plugin name");
522
if(add_environment(getplugin(arg), envdef, true)){
443
if(not add_environment(getplugin(p_name), envdef, true)){
444
perror("add_environment");
527
448
case 'd': /* --disable */
529
450
plugin *p = getplugin(arg);
452
return ARGP_ERR_UNKNOWN;
536
457
case 'e': /* --enable */
538
459
plugin *p = getplugin(arg);
461
return ARGP_ERR_UNKNOWN;
545
466
case 128: /* --plugin-dir */
547
467
plugindir = strdup(arg);
548
if(plugindir != NULL){
468
if(plugindir == NULL){
552
472
case 129: /* --config-file */
553
473
/* This is already done by parse_opt_config_file() */
555
475
case 130: /* --userid */
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);
476
uid = (uid_t)strtol(arg, NULL, 10);
566
478
case 131: /* --groupid */
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);
479
gid = (gid_t)strtol(arg, NULL, 10);
577
481
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.
607
484
case ARGP_KEY_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));
485
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
620
490
return ARGP_ERR_UNKNOWN;
622
return errno; /* Set to 0 at start */
625
495
/* This option parser is the same as parse_opt() above, except it
626
496
ignores everything but the --config-file option. */
627
error_t parse_opt_config_file(int key, char *arg,
628
__attribute__((unused))
629
struct argp_state *state){
497
error_t parse_opt_config_file (int key, char *arg,
498
__attribute__((unused))
499
struct argp_state *state) {
632
501
case 'g': /* --global-options */
633
502
case 'G': /* --global-env */
634
503
case 'o': /* --options-for */
726
582
new_arg = strdup(p);
727
583
if(new_arg == NULL){
728
error(0, errno, "strdup");
729
exitstatus = EX_OSERR;
585
exitstatus = EXIT_FAILURE;
734
590
custom_argc += 1;
736
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
737
char **new_argv = reallocarray(custom_argv,
738
(size_t)custom_argc + 1,
741
char **new_argv = NULL;
742
if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
746
new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
750
if(new_argv == NULL){
751
error(0, errno, "reallocarray");
752
exitstatus = EX_OSERR;
757
custom_argv = new_argv;
591
custom_argv = realloc(custom_argv, sizeof(char *)
592
* ((unsigned int) custom_argc + 1));
593
if(custom_argv == NULL){
595
exitstatus = EXIT_FAILURE;
760
599
custom_argv[custom_argc-1] = new_arg;
761
custom_argv[custom_argc] = NULL;
600
custom_argv[custom_argc] = NULL;
765
ret = fclose(conffp);
766
} while(ret == EOF and errno == EINTR);
768
error(0, errno, "fclose");
769
exitstatus = EX_IOERR;
774
605
/* Check for harmful errors and go to fallback. Other errors might
775
606
not affect opening plugins */
776
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
777
error(0, errno, "fopen");
778
exitstatus = EX_OSERR;
607
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
609
exitstatus = EXIT_FAILURE;
782
/* If there were any arguments from the configuration file, pass
783
them to parser as command line arguments */
613
/* If there was any arguments from configuration file,
614
pass them to parser as command arguments */
784
615
if(custom_argv != NULL){
785
ret = argp_parse(&argp, custom_argc, custom_argv,
786
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
794
error(0, errno, "argp_parse");
795
exitstatus = EX_OSERR;
798
exitstatus = EX_CONFIG;
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;
803
625
/* Parse actual command line arguments, to let them override the
805
ret = argp_parse(&argp, argc, argv,
806
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
814
error(0, errno, "argp_parse");
815
exitstatus = EX_OSERR;
818
exitstatus = EX_USAGE;
823
char *pluginhelperenv;
825
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
826
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
828
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
830
if(ret == -1 or not bret){
831
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
832
" environment variable to \"%s\" for all plugins\n",
833
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
836
free(pluginhelperenv);
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;
841
for(plugin *p = plugin_list; p != NULL; p = p->next){
635
for(plugin *p = plugin_list; p != NULL; p=p->next){
842
636
fprintf(stderr, "Plugin: %s has %d arguments\n",
843
637
p->name ? p->name : "Global", p->argc - 1);
844
638
for(char **a = p->argv; *a != NULL; a++){
845
639
fprintf(stderr, "\tArg: %s\n", *a);
847
fprintf(stderr, "...and %d environment variables\n", p->envc);
641
fprintf(stderr, "...and %u environment variables\n", p->envc);
848
642
for(char **a = p->environ; *a != NULL; a++){
849
643
fprintf(stderr, "\t%s\n", *a);
855
/* Work around Debian bug #633582:
856
<https://bugs.debian.org/633582> */
857
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
858
if(plugindir_fd == -1){
860
error(0, errno, "open(\"" PDIR "\")");
863
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
865
error(0, errno, "fstat");
867
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
868
ret = fchown(plugindir_fd, uid, gid);
870
error(0, errno, "fchown");
877
/* Work around Debian bug #981302
878
<https://bugs.debian.org/981302> */
879
if(lstat("/dev/fd", &st) != 0 and errno == ENOENT){
880
ret = symlink("/proc/self/fd", "/dev/fd");
882
error(0, errno, "Failed to create /dev/fd symlink");
887
/* Lower permissions */
890
error(0, errno, "setgid");
648
/* Strip permissions down to nobody */
892
649
ret = setuid(uid);
894
error(0, errno, "setuid");
897
/* Open plugin directory with close_on_exec flag */
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 */
899
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
902
#else /* not O_CLOEXEC */
904
#endif /* not O_CLOEXEC */
907
error(0, errno, "Could not open plugin dir");
908
exitstatus = EX_UNAVAILABLE;
913
/* Set the FD_CLOEXEC flag on the directory */
914
ret = set_cloexec_flag(dir_fd);
916
error(0, errno, "set_cloexec_flag");
917
exitstatus = EX_OSERR;
920
#endif /* O_CLOEXEC */
923
int good_name(const struct dirent * const dirent){
924
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
925
"*.dpkg-old", "*.dpkg-bak",
926
"*.dpkg-divert", NULL };
928
#pragma GCC diagnostic push
929
#pragma GCC diagnostic ignored "-Wcast-qual"
931
for(const char **pat = (const char **)patterns;
932
*pat != NULL; pat++){
934
#pragma GCC diagnostic pop
936
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
939
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
940
" matching pattern %s\n", dirent->d_name, *pat);
672
int dir_fd = dirfd(dir);
674
ret = set_cloexec_flag(dir_fd);
676
perror("set_cloexec_flag");
677
exitstatus = EXIT_FAILURE;
948
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
950
if(numplugins == -1){
951
error(0, errno, "Could not scan plugin dir");
953
exitstatus = EX_OSERR;
957
683
FD_ZERO(&rfds_all);
959
685
/* Read and execute any executable in the plugin directory*/
960
for(int i = 0; i < numplugins; i++){
962
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
964
error(0, errno, "Could not open plugin");
968
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
970
error(0, errno, "stat");
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
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
751
ret = stat(filename, &st);
976
758
/* Ignore non-executable files */
977
if(not S_ISREG(st.st_mode)
978
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
759
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
981
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
982
" with bad type or mode\n",
983
plugindir != NULL ? plugindir : PDIR,
984
direntries[i]->d_name);
761
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
762
" with bad type or mode\n", filename);
991
plugin *p = getplugin(direntries[i]->d_name);
768
plugin *p = getplugin(dirst->d_name);
993
error(0, errno, "getplugin");
1000
776
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
1001
direntries[i]->d_name);
1004
free(direntries[i]);
1011
786
for(char **a = g->argv + 1; *a != NULL; a++){
1012
787
if(not add_argument(p, *a)){
1013
error(0, errno, "add_argument");
788
perror("add_argument");
1016
791
/* Add global environment variables */
1017
792
for(char **e = g->environ; *e != NULL; e++){
1018
793
if(not add_environment(p, *e, false)){
1019
error(0, errno, "add_environment");
794
perror("add_environment");
1024
/* If this plugin has any environment variables, we need to
1025
duplicate the environment from this process, too. */
799
/* If this plugin has any environment variables, we will call
800
using execve and need to duplicate the environment from this
1026
802
if(p->environ[0] != NULL){
1027
803
for(char **e = environ; *e != NULL; e++){
1028
804
if(not add_environment(p, *e, false)){
1029
error(0, errno, "add_environment");
805
perror("add_environment");
1036
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1037
#else /* O_CLOEXEC */
1038
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
1039
#endif /* O_CLOEXEC */
1041
error(0, errno, "pipe");
1042
exitstatus = EX_OSERR;
1043
free(direntries[i]);
1046
if(pipefd[0] >= FD_SETSIZE){
1047
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1051
exitstatus = EX_OSERR;
1052
free(direntries[i]);
814
exitstatus = EXIT_FAILURE;
1056
817
/* Ask OS to automatic close the pipe on exec */
1057
818
ret = set_cloexec_flag(pipefd[0]);
1059
error(0, errno, "set_cloexec_flag");
1062
exitstatus = EX_OSERR;
1063
free(direntries[i]);
820
perror("set_cloexec_flag");
821
exitstatus = EXIT_FAILURE;
1066
824
ret = set_cloexec_flag(pipefd[1]);
1068
error(0, errno, "set_cloexec_flag");
1071
exitstatus = EX_OSERR;
1072
free(direntries[i]);
826
perror("set_cloexec_flag");
827
exitstatus = EXIT_FAILURE;
1075
#endif /* not O_CLOEXEC */
1076
830
/* Block SIGCHLD until process is safely in process list */
1077
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1078
&sigchld_action.sa_mask,
831
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1081
error(0, errno, "sigprocmask");
1082
exitstatus = EX_OSERR;
1083
free(direntries[i]);
833
perror("sigprocmask");
834
exitstatus = EXIT_FAILURE;
1086
837
/* Starting a new process to be watched */
1090
} while(pid == -1 and errno == EINTR);
1092
error(0, errno, "fork");
1093
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1094
&sigchld_action.sa_mask, NULL));
1097
exitstatus = EX_OSERR;
1098
free(direntries[i]);
841
exitstatus = EXIT_FAILURE;
1102
845
/* this is the child process */
1103
846
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1105
error(0, errno, "sigaction");
1108
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
851
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1110
error(0, errno, "sigprocmask");
853
perror("sigprocmask");
1114
857
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1116
error(0, errno, "dup2");
1120
if(fexecve(plugin_fd, p->argv,
1121
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1122
error(0, errno, "fexecve for %s/%s",
1123
plugindir != NULL ? plugindir : PDIR,
1124
direntries[i]->d_name);
864
/* If dir has no file descriptor, we could not set FD_CLOEXEC
865
above and must now close it manually here. */
868
if(p->environ[0] == NULL){
869
if(execv(filename, p->argv) < 0){
874
if(execve(filename, p->argv, p->environ) < 0){
1129
881
/* Parent process */
1130
882
close(pipefd[1]); /* Close unused write end of pipe */
1132
plugin *new_plugin = getplugin(direntries[i]->d_name);
1133
if(new_plugin == NULL){
1134
error(0, errno, "getplugin");
1135
ret = (int)(TEMP_FAILURE_RETRY
1136
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
884
plugin *new_plugin = getplugin(dirst->d_name);
885
if (new_plugin == NULL){
887
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1139
error(0, errno, "sigprocmask");
889
perror("sigprocmask");
1141
exitstatus = EX_OSERR;
1142
free(direntries[i]);
891
exitstatus = EXIT_FAILURE;
1145
free(direntries[i]);
1147
895
new_plugin->pid = pid;
1148
896
new_plugin->fd = pipefd[0];
1151
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1152
new_plugin->name, (intmax_t) (new_plugin->pid));
1155
898
/* Unblock SIGCHLD so signal handler can be run if this process
1156
899
has already completed */
1157
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1158
&sigchld_action.sa_mask,
900
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1161
error(0, errno, "sigprocmask");
1162
exitstatus = EX_OSERR;
902
perror("sigprocmask");
903
exitstatus = EXIT_FAILURE;
1166
907
FD_SET(new_plugin->fd, &rfds_all);
1168
if(maxfd < new_plugin->fd){
909
if (maxfd < new_plugin->fd){
1169
910
maxfd = new_plugin->fd;
1177
free_plugin(getplugin(NULL));
1179
918
for(plugin *p = plugin_list; p != NULL; p = p->next){
1180
919
if(p->pid != 0){
1186
925
free_plugin_list();
1190
929
/* Main loop while running plugins exist */
1191
930
while(plugin_list){
1192
931
fd_set rfds = rfds_all;
1193
932
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1194
if(select_ret == -1 and errno != EINTR){
1195
error(0, errno, "select");
1196
exitstatus = EX_OSERR;
933
if (select_ret == -1){
935
exitstatus = EXIT_FAILURE;
1199
938
/* OK, now either a process completed, or something can be read
1200
939
from one of them */
1201
for(plugin *proc = plugin_list; proc != NULL;){
940
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1202
941
/* Is this process completely done? */
1203
if(proc->completed and proc->eof){
942
if(proc->eof and proc->completed){
1204
943
/* Only accept the plugin output if it exited cleanly */
1205
944
if(not WIFEXITED(proc->status)
1206
945
or WEXITSTATUS(proc->status) != 0){
1207
946
/* Bad exit by plugin */
1210
949
if(WIFEXITED(proc->status)){
1211
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1212
" status %d\n", proc->name,
1213
(intmax_t) (proc->pid),
950
fprintf(stderr, "Plugin %u exited with status %d\n",
951
(unsigned int) (proc->pid),
1214
952
WEXITSTATUS(proc->status));
1215
} else if(WIFSIGNALED(proc->status)){
1216
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1217
" signal %d: %s\n", proc->name,
1218
(intmax_t) (proc->pid),
1219
WTERMSIG(proc->status),
1220
strsignal(WTERMSIG(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));
957
} else if(WCOREDUMP(proc->status)){
958
fprintf(stderr, "Plugin %d dumped core\n",
959
(unsigned int) (proc->pid));
1224
963
/* Remove the plugin */
1225
964
FD_CLR(proc->fd, &rfds_all);
1227
966
/* Block signal while modifying process_list */
1228
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1230
&sigchld_action.sa_mask,
967
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1233
error(0, errno, "sigprocmask");
1234
exitstatus = EX_OSERR;
969
perror("sigprocmask");
970
exitstatus = EXIT_FAILURE;
1238
plugin *next_plugin = proc->next;
1239
973
free_plugin(proc);
1242
974
/* We are done modifying process list, so unblock signal */
1243
ret = (int)(TEMP_FAILURE_RETRY
1244
(sigprocmask(SIG_UNBLOCK,
1245
&sigchld_action.sa_mask, NULL)));
975
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
1247
error(0, errno, "sigprocmask");
1248
exitstatus = EX_OSERR;
978
perror("sigprocmask");
979
exitstatus = EXIT_FAILURE;
1252
983
if(plugin_list == NULL){
1259
989
/* This process exited nicely, so print its buffer */
1261
991
bool bret = print_out_password(proc->buffer,
1262
992
proc->buffer_length);
1264
error(0, errno, "print_out_password");
1265
exitstatus = EX_IOERR;
994
perror("print_out_password");
995
exitstatus = EXIT_FAILURE;