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
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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
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful, but
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.
10
* 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
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
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* <http://www.gnu.org/licenses/>.
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
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* Contact the authors at <mandos@fukt.bsnet.se>.
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* Contact the authors at <mandos@recompile.se>.
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
#define _GNU_SOURCE /* strchrnul(), TEMP_FAILURE_RETRY(),
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getline(), asprintf(), O_CLOEXEC,
28
scandirat(), pipe2() */
29
#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 */
40
#include <sys/types.h> /* pid_t, sig_atomic_t, uid_t, gid_t,
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getuid(), setgid(), setuid() */
26
42
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
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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(),
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WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
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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(),
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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(),
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(),
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realloc(), EXIT_SUCCESS */
49
#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 */
53
#define _GNU_SOURCE /* strchrnul(), TEMP_FAILURE_RETRY(),
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getline(), asprintf(), O_CLOEXEC,
55
scandirat(), pipe2() */
56
#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(),
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
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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 */
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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,
73
#include <dirent.h> /* struct dirent, scandirat(),
75
#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 */
67
90
#define BUFFER_SIZE 256
69
92
#define PDIR "/lib/mandos/plugins.d"
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#define PHDIR "/lib/mandos/plugin-helpers"
70
94
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
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const char *argp_program_version = "plugin-runner 1.0";
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const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
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const char *argp_program_version = "plugin-runner " VERSION;
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const char *argp_program_bug_address = "<mandos@recompile.se>";
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typedef struct plugin{
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100
char *name; /* can be NULL or any plugin name */
373
442
.doc = "Group ID the plugins will run as", .group = 3 },
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{ .name = "debug", .key = 132,
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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 = '?',
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.doc = "Give this help list", .group = -1 },
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{ .name = "usage", .key = -3,
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.doc = "Give a short usage message", .group = -1 },
456
{ .name = "version", .key = 'V',
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.doc = "Print program version", .group = -1 },
379
error_t parse_opt (int key, char *arg, __attribute__((unused))
380
struct argp_state *state) {
461
__attribute__((nonnull(3)))
462
error_t parse_opt(int key, char *arg, struct argp_state *state){
382
467
case 'g': /* --global-options */
385
while((p = strsep(&arg, ",")) != NULL){
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if(not add_argument(getplugin(NULL), p)){
390
perror("add_argument");
391
return ARGP_ERR_UNKNOWN;
470
while((plugin_option = strsep(&arg, ",")) != NULL){
471
if(not add_argument(getplugin(NULL), plugin_option)){
396
478
case 'G': /* --global-env */
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if(not add_environment(getplugin(NULL), arg, true)){
401
perror("add_environment");
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if(add_environment(getplugin(NULL), arg, true)){
404
483
case 'o': /* --options-for */
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char *p_name = strsep(&arg, ":");
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if(p_name[0] == '\0' or arg == NULL){
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char *opt = strsep(&arg, ":");
411
if(opt[0] == '\0' or opt == NULL){
415
while((p = strsep(&opt, ",")) != NULL){
419
if(not add_argument(getplugin(p_name), p)){
420
perror("add_argument");
421
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)){
426
507
case 'E': /* --env-for */
431
509
char *envdef = strchr(arg, ':');
432
510
if(envdef == NULL){
511
argp_error(state, "No colon in \"%s\"", arg);
436
if(not add_environment(getplugin(arg), envdef+1, true)){
437
perror("add_environment");
518
argp_error(state, "Empty plugin name");
522
if(add_environment(getplugin(arg), envdef, true)){
441
527
case 'd': /* --disable */
443
529
plugin *p = getplugin(arg);
445
return ARGP_ERR_UNKNOWN;
450
536
case 'e': /* --enable */
452
538
plugin *p = getplugin(arg);
454
return ARGP_ERR_UNKNOWN;
459
545
case 128: /* --plugin-dir */
461
547
plugindir = strdup(arg);
462
if(plugindir == NULL){
548
if(plugindir != NULL){
466
552
case 129: /* --config-file */
467
553
/* This is already done by parse_opt_config_file() */
469
555
case 130: /* --userid */
470
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);
472
566
case 131: /* --groupid */
473
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);
475
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.
478
607
case ARGP_KEY_ARG:
479
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));
484
620
return ARGP_ERR_UNKNOWN;
622
return errno; /* Set to 0 at start */
489
625
/* This option parser is the same as parse_opt() above, except it
490
626
ignores everything but the --config-file option. */
491
error_t parse_opt_config_file (int key, char *arg,
492
__attribute__((unused))
493
struct argp_state *state) {
627
error_t parse_opt_config_file(int key, char *arg,
628
__attribute__((unused))
629
struct argp_state *state){
495
632
case 'g': /* --global-options */
496
633
case 'G': /* --global-env */
497
634
case 'o': /* --options-for */
577
726
new_arg = strdup(p);
578
727
if(new_arg == NULL){
580
exitstatus = EXIT_FAILURE;
728
error(0, errno, "strdup");
729
exitstatus = EX_OSERR;
585
734
custom_argc += 1;
586
custom_argv = realloc(custom_argv, sizeof(char *)
587
* ((unsigned int) custom_argc + 1));
588
if(custom_argv == NULL){
590
exitstatus = EXIT_FAILURE;
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;
594
760
custom_argv[custom_argc-1] = new_arg;
595
custom_argv[custom_argc] = NULL;
761
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;
600
774
/* Check for harmful errors and go to fallback. Other errors might
601
775
not affect opening plugins */
602
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
604
exitstatus = EXIT_FAILURE;
776
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
777
error(0, errno, "fopen");
778
exitstatus = EX_OSERR;
608
/* If there was any arguments from configuration file,
609
pass them to parser as command arguments */
782
/* If there were any arguments from the configuration file, pass
783
them to parser as command line arguments */
610
784
if(custom_argv != NULL){
611
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
613
if (ret == ARGP_ERR_UNKNOWN){
614
fprintf(stderr, "Unknown error while parsing arguments\n");
615
exitstatus = EXIT_FAILURE;
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;
620
803
/* Parse actual command line arguments, to let them override the
622
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
623
if (ret == ARGP_ERR_UNKNOWN){
624
fprintf(stderr, "Unknown error while parsing arguments\n");
625
exitstatus = EXIT_FAILURE;
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);
630
for(plugin *p = plugin_list; p != NULL; p=p->next){
841
for(plugin *p = plugin_list; p != NULL; p = p->next){
631
842
fprintf(stderr, "Plugin: %s has %d arguments\n",
632
843
p->name ? p->name : "Global", p->argc - 1);
633
844
for(char **a = p->argv; *a != NULL; a++){
634
845
fprintf(stderr, "\tArg: %s\n", *a);
636
fprintf(stderr, "...and %u environment variables\n", p->envc);
847
fprintf(stderr, "...and %d environment variables\n", p->envc);
637
848
for(char **a = p->environ; *a != NULL; a++){
638
849
fprintf(stderr, "\t%s\n", *a);
643
/* Strip permissions down to nobody */
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");
644
892
ret = setuid(uid);
653
if (plugindir == NULL){
656
dir = opendir(plugindir);
660
perror("Could not open plugin dir");
661
exitstatus = EXIT_FAILURE;
665
/* Set the FD_CLOEXEC flag on the directory, if possible */
894
error(0, errno, "setuid");
897
/* Open plugin directory with close_on_exec flag */
667
int dir_fd = dirfd(dir);
669
ret = set_cloexec_flag(dir_fd);
671
perror("set_cloexec_flag");
672
exitstatus = EXIT_FAILURE;
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);
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;
678
957
FD_ZERO(&rfds_all);
680
959
/* Read and execute any executable in the plugin directory*/
682
dirst = readdir(dir);
684
/* All directory entries have been processed */
688
exitstatus = EXIT_FAILURE;
694
d_name_len = strlen(dirst->d_name);
696
/* Ignore dotfiles, backup files and other junk */
698
bool bad_name = false;
700
const char const *bad_prefixes[] = { ".", "#", NULL };
702
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
704
".dpkg-divert", NULL };
705
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
706
size_t pre_len = strlen(*pre);
707
if((d_name_len >= pre_len)
708
and strncmp((dirst->d_name), *pre, pre_len) == 0){
710
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
711
" with bad prefix %s\n", dirst->d_name, *pre);
720
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
721
size_t suf_len = strlen(*suf);
722
if((d_name_len >= suf_len)
723
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
726
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
727
" with bad suffix %s\n", dirst->d_name, *suf);
740
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
746
ret = stat(filename, &st);
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");
753
976
/* Ignore non-executable files */
754
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
977
if(not S_ISREG(st.st_mode)
978
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
756
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
757
" with bad type or mode\n", filename);
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);
763
plugin *p = getplugin(dirst->d_name);
991
plugin *p = getplugin(direntries[i]->d_name);
993
error(0, errno, "getplugin");
771
1000
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
1001
direntries[i]->d_name);
1004
free(direntries[i]);
781
1011
for(char **a = g->argv + 1; *a != NULL; a++){
782
1012
if(not add_argument(p, *a)){
783
perror("add_argument");
1013
error(0, errno, "add_argument");
786
1016
/* Add global environment variables */
787
1017
for(char **e = g->environ; *e != NULL; e++){
788
1018
if(not add_environment(p, *e, false)){
789
perror("add_environment");
1019
error(0, errno, "add_environment");
794
/* If this plugin has any environment variables, we will call
795
using execve and need to duplicate the environment from this
1024
/* If this plugin has any environment variables, we need to
1025
duplicate the environment from this process, too. */
797
1026
if(p->environ[0] != NULL){
798
1027
for(char **e = environ; *e != NULL; e++){
799
1028
if(not add_environment(p, *e, false)){
800
perror("add_environment");
1029
error(0, errno, "add_environment");
809
exitstatus = EXIT_FAILURE;
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]);
812
1056
/* Ask OS to automatic close the pipe on exec */
813
1057
ret = set_cloexec_flag(pipefd[0]);
815
perror("set_cloexec_flag");
816
exitstatus = EXIT_FAILURE;
1059
error(0, errno, "set_cloexec_flag");
1062
exitstatus = EX_OSERR;
1063
free(direntries[i]);
819
1066
ret = set_cloexec_flag(pipefd[1]);
821
perror("set_cloexec_flag");
822
exitstatus = EXIT_FAILURE;
1068
error(0, errno, "set_cloexec_flag");
1071
exitstatus = EX_OSERR;
1072
free(direntries[i]);
1075
#endif /* not O_CLOEXEC */
825
1076
/* Block SIGCHLD until process is safely in process list */
826
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1077
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1078
&sigchld_action.sa_mask,
828
perror("sigprocmask");
829
exitstatus = EXIT_FAILURE;
1081
error(0, errno, "sigprocmask");
1082
exitstatus = EX_OSERR;
1083
free(direntries[i]);
832
1086
/* Starting a new process to be watched */
1090
} while(pid == -1 and errno == EINTR);
836
exitstatus = EXIT_FAILURE;
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]);
840
1102
/* this is the child process */
841
1103
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1105
error(0, errno, "sigaction");
846
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1108
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
848
perror("sigprocmask");
1110
error(0, errno, "sigprocmask");
852
1114
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1116
error(0, errno, "dup2");
859
/* If dir has no file descriptor, we could not set FD_CLOEXEC
860
above and must now close it manually here. */
863
if(p->environ[0] == NULL){
864
if(execv(filename, p->argv) < 0){
869
if(execve(filename, p->argv, p->environ) < 0){
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);
876
1129
/* Parent process */
877
1130
close(pipefd[1]); /* Close unused write end of pipe */
879
plugin *new_plugin = getplugin(dirst->d_name);
880
if (new_plugin == NULL){
882
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
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
perror("sigprocmask");
1139
error(0, errno, "sigprocmask");
886
exitstatus = EXIT_FAILURE;
1141
exitstatus = EX_OSERR;
1142
free(direntries[i]);
1145
free(direntries[i]);
890
1147
new_plugin->pid = pid;
891
1148
new_plugin->fd = pipefd[0];
1151
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1152
new_plugin->name, (intmax_t) (new_plugin->pid));
893
1155
/* Unblock SIGCHLD so signal handler can be run if this process
894
1156
has already completed */
895
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1157
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1158
&sigchld_action.sa_mask,
897
perror("sigprocmask");
898
exitstatus = EXIT_FAILURE;
1161
error(0, errno, "sigprocmask");
1162
exitstatus = EX_OSERR;
902
1166
FD_SET(new_plugin->fd, &rfds_all);
904
if (maxfd < new_plugin->fd){
1168
if(maxfd < new_plugin->fd){
905
1169
maxfd = new_plugin->fd;
1177
free_plugin(getplugin(NULL));
913
1179
for(plugin *p = plugin_list; p != NULL; p = p->next){
914
1180
if(p->pid != 0){
920
1186
free_plugin_list();
924
1190
/* Main loop while running plugins exist */
925
1191
while(plugin_list){
926
1192
fd_set rfds = rfds_all;
927
1193
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
928
if (select_ret == -1){
930
exitstatus = EXIT_FAILURE;
1194
if(select_ret == -1 and errno != EINTR){
1195
error(0, errno, "select");
1196
exitstatus = EX_OSERR;
933
1199
/* OK, now either a process completed, or something can be read
934
1200
from one of them */
935
1201
for(plugin *proc = plugin_list; proc != NULL;){
936
1202
/* Is this process completely done? */
937
if(proc->eof and proc->completed){
1203
if(proc->completed and proc->eof){
938
1204
/* Only accept the plugin output if it exited cleanly */
939
1205
if(not WIFEXITED(proc->status)
940
1206
or WEXITSTATUS(proc->status) != 0){
941
1207
/* Bad exit by plugin */
944
1210
if(WIFEXITED(proc->status)){
945
fprintf(stderr, "Plugin %u exited with status %d\n",
946
(unsigned int) (proc->pid),
1211
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1212
" status %d\n", proc->name,
1213
(intmax_t) (proc->pid),
947
1214
WEXITSTATUS(proc->status));
948
} else if(WIFSIGNALED(proc->status)) {
949
fprintf(stderr, "Plugin %u killed by signal %d\n",
950
(unsigned int) (proc->pid),
951
WTERMSIG(proc->status));
952
} else if(WCOREDUMP(proc->status)){
953
fprintf(stderr, "Plugin %d dumped core\n",
954
(unsigned int) (proc->pid));
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)));
958
1224
/* Remove the plugin */
959
1225
FD_CLR(proc->fd, &rfds_all);
961
1227
/* Block signal while modifying process_list */
962
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
964
perror("sigprocmask");
965
exitstatus = EXIT_FAILURE;
969
/* We are done modifying process list, so unblock signal */
970
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
973
perror("sigprocmask");
974
exitstatus = EXIT_FAILURE;
978
if(plugin_list == NULL){
1228
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1230
&sigchld_action.sa_mask,
1233
error(0, errno, "sigprocmask");
1234
exitstatus = EX_OSERR;
982
1238
plugin *next_plugin = proc->next;
983
1239
free_plugin(proc);
984
1240
proc = next_plugin;
1242
/* 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)));
1247
error(0, errno, "sigprocmask");
1248
exitstatus = EX_OSERR;
1252
if(plugin_list == NULL){
988
1259
/* This process exited nicely, so print its buffer */
990
1261
bool bret = print_out_password(proc->buffer,
991
1262
proc->buffer_length);
993
perror("print_out_password");
994
exitstatus = EXIT_FAILURE;
1264
error(0, errno, "print_out_password");
1265
exitstatus = EX_IOERR;
1005
1276
/* Before reading, make the process' data buffer large enough */
1006
1277
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1007
proc->buffer = realloc(proc->buffer, proc->buffer_size
1008
+ (size_t) BUFFER_SIZE);
1009
if (proc->buffer == NULL){
1011
exitstatus = EXIT_FAILURE;
1278
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1279
+ (size_t) BUFFER_SIZE);
1280
if(new_buffer == NULL){
1281
error(0, errno, "malloc");
1282
exitstatus = EX_OSERR;
1285
proc->buffer = new_buffer;
1014
1286
proc->buffer_size += BUFFER_SIZE;
1016
1288
/* Read from the process */
1017
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1289
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1291
+ proc->buffer_length,
1020
1294
/* Read error from this process; ignore the error */
1021
1295
proc = proc->next;
1026
1300
proc->eof = true;
1028
proc->buffer_length += (size_t) ret;
1302
proc->buffer_length += (size_t) sret;
1036
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1310
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1311
and exitstatus != EX_OK)){
1037
1312
/* Fallback if all plugins failed, none are found or an error
1040
1315
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1041
1316
char *passwordbuffer = getpass("Password: ");
1042
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1317
size_t len = strlen(passwordbuffer);
1318
/* Strip trailing newline */
1319
if(len > 0 and passwordbuffer[len-1] == '\n'){
1320
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1323
bret = print_out_password(passwordbuffer, len);
1044
perror("print_out_password");
1045
exitstatus = EXIT_FAILURE;
1325
error(0, errno, "print_out_password");
1326
exitstatus = EX_IOERR;
1049
1330
/* Restore old signal handler */
1050
1331
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1052
perror("sigaction");
1053
exitstatus = EXIT_FAILURE;
1333
error(0, errno, "sigaction");
1334
exitstatus = EX_OSERR;
1056
1337
if(custom_argv != NULL){
1057
1338
for(char **arg = custom_argv+1; *arg != NULL; arg++){