1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
3
3
* Mandos plugin runner - Run Mandos plugins
5
* Copyright © 2008-2018 Teddy Hogeborn
6
* Copyright © 2008-2018 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
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
16
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/>.
18
* along with this program. If not, see
19
* <http://www.gnu.org/licenses/>.
23
* Contact the authors at <mandos@recompile.se>.
21
* Contact the authors at <mandos@fukt.bsnet.se>.
26
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
28
26
#include <stddef.h> /* size_t, NULL */
29
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
31
29
#include <stdbool.h> /* bool, true, false */
32
#include <stdio.h> /* fileno(), fprintf(),
33
stderr, STDOUT_FILENO, fclose() */
34
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
35
WIFEXITED(), WEXITSTATUS(), wait(),
36
pid_t, uid_t, gid_t, getuid(),
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(),
38
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
38
FD_SET(), FD_ISSET(), FD_CLR */
40
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
42
#include <iso646.h> /* and, or, not */
44
#include <dirent.h> /* struct dirent, scandirat() */
45
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
46
FD_CLOEXEC, write(), STDOUT_FILENO,
47
struct stat, fstat(), close(),
48
setgid(), setuid(), S_ISREG(),
49
faccessat() pipe2(), fork(),
50
_exit(), dup2(), fexecve(), read()
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(),
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC, openat(), scandirat(),
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
54
#include <string.h> /* strsep, strlen(), asprintf() */
57
55
#include <errno.h> /* errno */
58
56
#include <argp.h> /* struct argp_option, struct
59
57
argp_state, struct argp,
97
89
size_t buffer_size;
98
90
size_t buffer_length;
100
volatile sig_atomic_t completed;
92
volatile bool completed;
102
94
struct plugin *next;
105
97
static plugin *plugin_list = NULL;
107
/* Gets an existing plugin based on name,
99
/* Gets a existing plugin based on name,
108
100
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
110
101
static plugin *getplugin(char *name){
111
/* Check for existing plugin with that name */
112
for(plugin *p = plugin_list; p != NULL; p = p->next){
114
or (p->name and name and (strcmp(p->name, name) == 0))){
102
/* 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))){
118
109
/* Create a new plugin */
119
plugin *new_plugin = NULL;
121
new_plugin = malloc(sizeof(plugin));
122
} while(new_plugin == NULL and errno == EINTR);
123
if(new_plugin == NULL){
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
126
114
char *copy_name = NULL;
127
115
if(name != NULL){
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
116
copy_name = strdup(name);
131
117
if(copy_name == NULL){
139
*new_plugin = (plugin){ .name = copy_name,
142
.next = plugin_list };
145
new_plugin->argv = malloc(sizeof(char *) * 2);
146
} while(new_plugin->argv == NULL and errno == EINTR);
147
if(new_plugin->argv == NULL){
122
*new_plugin = (plugin) { .name = copy_name,
125
.next = plugin_list };
127
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if (new_plugin->argv == NULL){
150
130
free(new_plugin);
154
133
new_plugin->argv[0] = copy_name;
155
134
new_plugin->argv[1] = NULL;
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
136
new_plugin->environ = malloc(sizeof(char *));
160
137
if(new_plugin->environ == NULL){
163
139
free(new_plugin->argv);
164
140
free(new_plugin);
168
143
new_plugin->environ[0] = NULL;
417
370
.doc = "Group ID the plugins will run as", .group = 3 },
418
371
{ .name = "debug", .key = 132,
419
372
.doc = "Debug mode", .group = 4 },
420
{ .name = "plugin-helper-dir", .key = 133,
422
.doc = "Specify a different plugin helper directory",
425
* These reproduce what we would get without ARGP_NO_HELP
427
{ .name = "help", .key = '?',
428
.doc = "Give this help list", .group = -1 },
429
{ .name = "usage", .key = -3,
430
.doc = "Give a short usage message", .group = -1 },
431
{ .name = "version", .key = 'V',
432
.doc = "Print program version", .group = -1 },
436
__attribute__((nonnull(3)))
437
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) {
442
379
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;
393
case 'e': /* --global-env */
445
while((plugin_option = strsep(&arg, ",")) != NULL){
446
if(not add_argument(getplugin(NULL), plugin_option)){
453
case 'G': /* --global-env */
454
if(add_environment(getplugin(NULL), arg, true)){
398
char *envdef = strdup(arg);
402
if(not add_environment(getplugin(NULL), envdef, true)){
403
perror("add_environment");
458
407
case 'o': /* --options-for */
460
char *option_list = strchr(arg, ':');
461
if(option_list == NULL){
462
argp_error(state, "No colon in \"%s\"", arg);
469
argp_error(state, "Empty plugin name");
474
while((option = strsep(&option_list, ",")) != NULL){
475
if(not add_argument(getplugin(arg), option)){
409
char *p_name = strsep(&arg, ":");
410
if(p_name[0] == '\0'){
413
char *opt = strsep(&arg, ":");
419
while((p = strsep(&opt, ",")) != NULL){
423
if(not add_argument(getplugin(p_name), p)){
424
perror("add_argument");
425
return ARGP_ERR_UNKNOWN;
482
case 'E': /* --env-for */
431
case 'f': /* --env-for */
484
436
char *envdef = strchr(arg, ':');
485
437
if(envdef == NULL){
486
argp_error(state, "No colon in \"%s\"", arg);
440
char *p_name = strndup(arg, (size_t) (envdef-arg));
493
argp_error(state, "Empty plugin name");
497
if(add_environment(getplugin(arg), envdef, true)){
445
if(not add_environment(getplugin(p_name), envdef, true)){
446
perror("add_environment");
502
450
case 'd': /* --disable */
504
plugin *p = getplugin(arg);
511
case 'e': /* --enable */
513
plugin *p = getplugin(arg);
452
plugin *p = getplugin(arg);
454
return ARGP_ERR_UNKNOWN;
520
459
case 128: /* --plugin-dir */
522
460
plugindir = strdup(arg);
523
if(plugindir != NULL){
461
if(plugindir == NULL){
527
465
case 129: /* --config-file */
528
466
/* This is already done by parse_opt_config_file() */
530
468
case 130: /* --userid */
531
tmp_id = strtoimax(arg, &tmp, 10);
532
if(errno != 0 or tmp == arg or *tmp != '\0'
533
or tmp_id != (uid_t)tmp_id){
534
argp_error(state, "Bad user ID number: \"%s\", using %"
535
PRIdMAX, arg, (intmax_t)uid);
469
uid = (uid_t)strtol(arg, NULL, 10);
541
471
case 131: /* --groupid */
542
tmp_id = strtoimax(arg, &tmp, 10);
543
if(errno != 0 or tmp == arg or *tmp != '\0'
544
or tmp_id != (gid_t)tmp_id){
545
argp_error(state, "Bad group ID number: \"%s\", using %"
546
PRIdMAX, arg, (intmax_t)gid);
472
gid = (gid_t)strtol(arg, NULL, 10);
552
474
case 132: /* --debug */
555
case 133: /* --plugin-helper-dir */
556
free(pluginhelperdir);
557
pluginhelperdir = strdup(arg);
558
if(pluginhelperdir != NULL){
563
* These reproduce what we would get without ARGP_NO_HELP
565
case '?': /* --help */
566
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
567
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
568
__builtin_unreachable();
569
case -3: /* --usage */
570
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
571
argp_state_help(state, state->out_stream,
572
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
573
__builtin_unreachable();
574
case 'V': /* --version */
575
fprintf(state->out_stream, "%s\n", argp_program_version);
579
* When adding more options before this line, remember to also add a
580
* "case" to the "parse_opt_config_file" function below.
582
477
case ARGP_KEY_ARG:
583
/* Cryptsetup always passes an argument, which is an empty
584
string if "none" was specified in /etc/crypttab. So if
585
argument was empty, we ignore it silently. */
478
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
591
483
return ARGP_ERR_UNKNOWN;
593
return errno; /* Set to 0 at start */
596
488
/* This option parser is the same as parse_opt() above, except it
597
489
ignores everything but the --config-file option. */
598
error_t parse_opt_config_file(int key, char *arg,
599
__attribute__((unused))
600
struct argp_state *state){
490
error_t parse_opt_config_file (int key, char *arg,
491
__attribute__((unused))
492
struct argp_state *state) {
603
494
case 'g': /* --global-options */
604
case 'G': /* --global-env */
495
case 'e': /* --global-env */
605
496
case 'o': /* --options-for */
606
case 'E': /* --env-for */
497
case 'f': /* --env-for */
607
498
case 'd': /* --disable */
608
case 'e': /* --enable */
609
499
case 128: /* --plugin-dir */
611
501
case 129: /* --config-file */
613
502
argfile = strdup(arg);
618
507
case 130: /* --userid */
619
508
case 131: /* --groupid */
620
509
case 132: /* --debug */
621
case 133: /* --plugin-helper-dir */
622
case '?': /* --help */
623
case -3: /* --usage */
624
case 'V': /* --version */
625
510
case ARGP_KEY_ARG:
628
514
return ARGP_ERR_UNKNOWN;
633
519
struct argp argp = { .options = options,
697
574
new_arg = strdup(p);
698
575
if(new_arg == NULL){
699
error(0, errno, "strdup");
700
exitstatus = EX_OSERR;
577
exitstatus = EXIT_FAILURE;
705
582
custom_argc += 1;
707
char **new_argv = realloc(custom_argv, sizeof(char *)
708
* ((size_t)custom_argc + 1));
709
if(new_argv == NULL){
710
error(0, errno, "realloc");
711
exitstatus = EX_OSERR;
716
custom_argv = new_argv;
583
custom_argv = realloc(custom_argv, sizeof(char *)
584
* ((unsigned int) custom_argc + 1));
585
if(custom_argv == NULL){
587
exitstatus = EXIT_FAILURE;
719
591
custom_argv[custom_argc-1] = new_arg;
720
custom_argv[custom_argc] = NULL;
592
custom_argv[custom_argc] = NULL;
724
ret = fclose(conffp);
725
} while(ret == EOF and errno == EINTR);
727
error(0, errno, "fclose");
728
exitstatus = EX_IOERR;
733
597
/* Check for harmful errors and go to fallback. Other errors might
734
598
not affect opening plugins */
735
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
736
error(0, errno, "fopen");
737
exitstatus = EX_OSERR;
599
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
601
exitstatus = EXIT_FAILURE;
741
/* If there were any arguments from the configuration file, pass
742
them to parser as command line arguments */
605
/* If there was any arguments from configuration file,
606
pass them to parser as command arguments */
743
607
if(custom_argv != NULL){
744
ret = argp_parse(&argp, custom_argc, custom_argv,
745
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
753
error(0, errno, "argp_parse");
754
exitstatus = EX_OSERR;
757
exitstatus = EX_CONFIG;
608
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
610
if (ret == ARGP_ERR_UNKNOWN){
611
fprintf(stderr, "Unknown error while parsing arguments\n");
612
exitstatus = EXIT_FAILURE;
762
617
/* Parse actual command line arguments, to let them override the
764
ret = argp_parse(&argp, argc, argv,
765
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
773
error(0, errno, "argp_parse");
774
exitstatus = EX_OSERR;
777
exitstatus = EX_USAGE;
782
char *pluginhelperenv;
784
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
785
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
787
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
789
if(ret == -1 or not bret){
790
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
791
" environment variable to \"%s\" for all plugins\n",
792
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
795
free(pluginhelperenv);
619
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
620
if (ret == ARGP_ERR_UNKNOWN){
621
fprintf(stderr, "Unknown error while parsing arguments\n");
622
exitstatus = EXIT_FAILURE;
800
for(plugin *p = plugin_list; p != NULL; p = p->next){
627
for(plugin *p = plugin_list; p != NULL; p=p->next){
801
628
fprintf(stderr, "Plugin: %s has %d arguments\n",
802
629
p->name ? p->name : "Global", p->argc - 1);
803
630
for(char **a = p->argv; *a != NULL; a++){
804
631
fprintf(stderr, "\tArg: %s\n", *a);
806
fprintf(stderr, "...and %d environment variables\n", p->envc);
633
fprintf(stderr, "...and %u environment variables\n", p->envc);
807
634
for(char **a = p->environ; *a != NULL; a++){
808
635
fprintf(stderr, "\t%s\n", *a);
814
/* Work around Debian bug #633582:
815
<https://bugs.debian.org/633582> */
816
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
817
if(plugindir_fd == -1){
819
error(0, errno, "open(\"" PDIR "\")");
822
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
824
error(0, errno, "fstat");
826
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
827
ret = fchown(plugindir_fd, uid, gid);
829
error(0, errno, "fchown");
837
/* Lower permissions */
840
error(0, errno, "setgid");
640
/* Strip permissions down to nobody */
842
641
ret = setuid(uid);
844
error(0, errno, "setuid");
847
/* Open plugin directory with close_on_exec flag */
650
if (plugindir == NULL){
653
dir = opendir(plugindir);
657
perror("Could not open plugin dir");
658
exitstatus = EXIT_FAILURE;
662
/* Set the FD_CLOEXEC flag on the directory, if possible */
849
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
852
#else /* not O_CLOEXEC */
854
#endif /* not O_CLOEXEC */
857
error(0, errno, "Could not open plugin dir");
858
exitstatus = EX_UNAVAILABLE;
863
/* Set the FD_CLOEXEC flag on the directory */
864
ret = set_cloexec_flag(dir_fd);
866
error(0, errno, "set_cloexec_flag");
867
exitstatus = EX_OSERR;
870
#endif /* O_CLOEXEC */
873
int good_name(const struct dirent * const dirent){
874
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
875
"*.dpkg-old", "*.dpkg-bak",
876
"*.dpkg-divert", NULL };
878
#pragma GCC diagnostic push
879
#pragma GCC diagnostic ignored "-Wcast-qual"
881
for(const char **pat = (const char **)patterns;
882
*pat != NULL; pat++){
884
#pragma GCC diagnostic pop
886
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
889
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
890
" matching pattern %s\n", dirent->d_name, *pat);
664
int dir_fd = dirfd(dir);
666
ret = set_cloexec_flag(dir_fd);
668
perror("set_cloexec_flag");
669
exitstatus = EXIT_FAILURE;
898
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
900
if(numplugins == -1){
901
error(0, errno, "Could not scan plugin dir");
903
exitstatus = EX_OSERR;
907
675
FD_ZERO(&rfds_all);
909
677
/* Read and execute any executable in the plugin directory*/
910
for(int i = 0; i < numplugins; i++){
912
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
914
error(0, errno, "Could not open plugin");
918
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
920
error(0, errno, "stat");
679
dirst = readdir(dir);
681
/* All directory entries have been processed */
685
exitstatus = EXIT_FAILURE;
691
d_name_len = strlen(dirst->d_name);
693
/* Ignore dotfiles, backup files and other junk */
695
bool bad_name = false;
697
const char const *bad_prefixes[] = { ".", "#", NULL };
699
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
701
".dpkg-divert", NULL };
702
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
703
size_t pre_len = strlen(*pre);
704
if((d_name_len >= pre_len)
705
and strncmp((dirst->d_name), *pre, pre_len) == 0){
707
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
708
" with bad prefix %s\n", dirst->d_name, *pre);
717
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
718
size_t suf_len = strlen(*suf);
719
if((d_name_len >= suf_len)
720
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
723
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
724
" with bad suffix %s\n", dirst->d_name, *suf);
737
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
743
ret = stat(filename, &st);
926
750
/* Ignore non-executable files */
927
if(not S_ISREG(st.st_mode)
928
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
751
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
931
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
932
" with bad type or mode\n",
933
plugindir != NULL ? plugindir : PDIR,
934
direntries[i]->d_name);
753
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
754
" with bad type or mode\n", filename);
941
plugin *p = getplugin(direntries[i]->d_name);
760
plugin *p = getplugin(dirst->d_name);
943
error(0, errno, "getplugin");
950
768
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
951
direntries[i]->d_name);
961
778
for(char **a = g->argv + 1; *a != NULL; a++){
962
779
if(not add_argument(p, *a)){
963
error(0, errno, "add_argument");
780
perror("add_argument");
966
783
/* Add global environment variables */
967
784
for(char **e = g->environ; *e != NULL; e++){
968
785
if(not add_environment(p, *e, false)){
969
error(0, errno, "add_environment");
786
perror("add_environment");
974
/* If this plugin has any environment variables, we need to
975
duplicate the environment from this process, too. */
791
/* If this plugin has any environment variables, we will call
792
using execve and need to duplicate the environment from this
976
794
if(p->environ[0] != NULL){
977
795
for(char **e = environ; *e != NULL; e++){
978
796
if(not add_environment(p, *e, false)){
979
error(0, errno, "add_environment");
797
perror("add_environment");
986
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
987
#else /* O_CLOEXEC */
988
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
989
#endif /* O_CLOEXEC */
991
error(0, errno, "pipe");
992
exitstatus = EX_OSERR;
996
if(pipefd[0] >= FD_SETSIZE){
997
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1001
exitstatus = EX_OSERR;
1002
free(direntries[i]);
806
exitstatus = EXIT_FAILURE;
1006
809
/* Ask OS to automatic close the pipe on exec */
1007
810
ret = set_cloexec_flag(pipefd[0]);
1009
error(0, errno, "set_cloexec_flag");
1012
exitstatus = EX_OSERR;
1013
free(direntries[i]);
812
perror("set_cloexec_flag");
813
exitstatus = EXIT_FAILURE;
1016
816
ret = set_cloexec_flag(pipefd[1]);
1018
error(0, errno, "set_cloexec_flag");
1021
exitstatus = EX_OSERR;
1022
free(direntries[i]);
818
perror("set_cloexec_flag");
819
exitstatus = EXIT_FAILURE;
1025
#endif /* not O_CLOEXEC */
1026
822
/* Block SIGCHLD until process is safely in process list */
1027
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1028
&sigchld_action.sa_mask,
823
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1031
error(0, errno, "sigprocmask");
1032
exitstatus = EX_OSERR;
1033
free(direntries[i]);
825
perror("sigprocmask");
826
exitstatus = EXIT_FAILURE;
1036
829
/* Starting a new process to be watched */
1040
} while(pid == -1 and errno == EINTR);
1042
error(0, errno, "fork");
1043
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1044
&sigchld_action.sa_mask, NULL));
1047
exitstatus = EX_OSERR;
1048
free(direntries[i]);
833
exitstatus = EXIT_FAILURE;
1052
837
/* this is the child process */
1053
838
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1055
error(0, errno, "sigaction");
1058
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
843
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1060
error(0, errno, "sigprocmask");
845
perror("sigprocmask");
1064
849
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1066
error(0, errno, "dup2");
1070
if(fexecve(plugin_fd, p->argv,
1071
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1072
error(0, errno, "fexecve for %s/%s",
1073
plugindir != NULL ? plugindir : PDIR,
1074
direntries[i]->d_name);
856
/* If dir has no file descriptor, we could not set FD_CLOEXEC
857
above and must now close it manually here. */
860
if(p->environ[0] == NULL){
861
if(execv(filename, p->argv) < 0){
866
if(execve(filename, p->argv, p->environ) < 0){
1079
873
/* Parent process */
1080
874
close(pipefd[1]); /* Close unused write end of pipe */
1082
plugin *new_plugin = getplugin(direntries[i]->d_name);
1083
if(new_plugin == NULL){
1084
error(0, errno, "getplugin");
1085
ret = (int)(TEMP_FAILURE_RETRY
1086
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
876
plugin *new_plugin = getplugin(dirst->d_name);
877
if (new_plugin == NULL){
879
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1089
error(0, errno, "sigprocmask");
881
perror("sigprocmask");
1091
exitstatus = EX_OSERR;
1092
free(direntries[i]);
883
exitstatus = EXIT_FAILURE;
1095
free(direntries[i]);
1097
887
new_plugin->pid = pid;
1098
888
new_plugin->fd = pipefd[0];
1101
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1102
new_plugin->name, (intmax_t) (new_plugin->pid));
1105
890
/* Unblock SIGCHLD so signal handler can be run if this process
1106
891
has already completed */
1107
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1108
&sigchld_action.sa_mask,
892
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1111
error(0, errno, "sigprocmask");
1112
exitstatus = EX_OSERR;
894
perror("sigprocmask");
895
exitstatus = EXIT_FAILURE;
1116
899
FD_SET(new_plugin->fd, &rfds_all);
1118
if(maxfd < new_plugin->fd){
901
if (maxfd < new_plugin->fd){
1119
902
maxfd = new_plugin->fd;
1127
free_plugin(getplugin(NULL));
1129
910
for(plugin *p = plugin_list; p != NULL; p = p->next){
1130
911
if(p->pid != 0){
1136
917
free_plugin_list();
1140
921
/* Main loop while running plugins exist */
1141
922
while(plugin_list){
1142
923
fd_set rfds = rfds_all;
1143
924
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1144
if(select_ret == -1 and errno != EINTR){
1145
error(0, errno, "select");
1146
exitstatus = EX_OSERR;
925
if (select_ret == -1){
927
exitstatus = EXIT_FAILURE;
1149
930
/* OK, now either a process completed, or something can be read
1150
931
from one of them */
1151
for(plugin *proc = plugin_list; proc != NULL;){
932
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1152
933
/* Is this process completely done? */
1153
if(proc->completed and proc->eof){
934
if(proc->eof and proc->completed){
1154
935
/* Only accept the plugin output if it exited cleanly */
1155
936
if(not WIFEXITED(proc->status)
1156
937
or WEXITSTATUS(proc->status) != 0){
1157
938
/* Bad exit by plugin */
1160
941
if(WIFEXITED(proc->status)){
1161
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1162
" status %d\n", proc->name,
1163
(intmax_t) (proc->pid),
942
fprintf(stderr, "Plugin %u exited with status %d\n",
943
(unsigned int) (proc->pid),
1164
944
WEXITSTATUS(proc->status));
1165
} else if(WIFSIGNALED(proc->status)){
1166
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1167
" signal %d: %s\n", proc->name,
1168
(intmax_t) (proc->pid),
1169
WTERMSIG(proc->status),
1170
strsignal(WTERMSIG(proc->status)));
945
} else if(WIFSIGNALED(proc->status)) {
946
fprintf(stderr, "Plugin %u killed by signal %d\n",
947
(unsigned int) (proc->pid),
948
WTERMSIG(proc->status));
949
} else if(WCOREDUMP(proc->status)){
950
fprintf(stderr, "Plugin %d dumped core\n",
951
(unsigned int) (proc->pid));
1174
955
/* Remove the plugin */
1175
956
FD_CLR(proc->fd, &rfds_all);
1177
958
/* Block signal while modifying process_list */
1178
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1180
&sigchld_action.sa_mask,
959
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1183
error(0, errno, "sigprocmask");
1184
exitstatus = EX_OSERR;
961
perror("sigprocmask");
962
exitstatus = EXIT_FAILURE;
1188
plugin *next_plugin = proc->next;
1189
965
free_plugin(proc);
1192
966
/* We are done modifying process list, so unblock signal */
1193
ret = (int)(TEMP_FAILURE_RETRY
1194
(sigprocmask(SIG_UNBLOCK,
1195
&sigchld_action.sa_mask, NULL)));
967
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
1197
error(0, errno, "sigprocmask");
1198
exitstatus = EX_OSERR;
970
perror("sigprocmask");
971
exitstatus = EXIT_FAILURE;
1202
975
if(plugin_list == NULL){
1209
981
/* This process exited nicely, so print its buffer */
1211
983
bool bret = print_out_password(proc->buffer,
1212
984
proc->buffer_length);
1214
error(0, errno, "print_out_password");
1215
exitstatus = EX_IOERR;
986
perror("print_out_password");
987
exitstatus = EXIT_FAILURE;
1220
992
/* This process has not completed. Does it have any output? */
1221
993
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1222
994
/* This process had nothing to say at this time */
1226
997
/* Before reading, make the process' data buffer large enough */
1227
998
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1228
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1229
+ (size_t) BUFFER_SIZE);
1230
if(new_buffer == NULL){
1231
error(0, errno, "malloc");
1232
exitstatus = EX_OSERR;
999
proc->buffer = realloc(proc->buffer, proc->buffer_size
1000
+ (size_t) BUFFER_SIZE);
1001
if (proc->buffer == NULL){
1003
exitstatus = EXIT_FAILURE;
1235
proc->buffer = new_buffer;
1236
1006
proc->buffer_size += BUFFER_SIZE;
1238
1008
/* Read from the process */
1239
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1241
+ proc->buffer_length,
1009
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1244
1012
/* Read error from this process; ignore the error */
1250
1017
proc->eof = true;
1252
proc->buffer_length += (size_t) sret;
1019
proc->buffer_length += (size_t) ret;
1260
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1261
and exitstatus != EX_OK)){
1027
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1262
1028
/* Fallback if all plugins failed, none are found or an error
1265
1031
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1266
1032
char *passwordbuffer = getpass("Password: ");
1267
size_t len = strlen(passwordbuffer);
1268
/* Strip trailing newline */
1269
if(len > 0 and passwordbuffer[len-1] == '\n'){
1270
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1273
bret = print_out_password(passwordbuffer, len);
1033
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1275
error(0, errno, "print_out_password");
1276
exitstatus = EX_IOERR;
1035
perror("print_out_password");
1036
exitstatus = EXIT_FAILURE;
1280
1040
/* Restore old signal handler */
1281
1041
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1283
error(0, errno, "sigaction");
1284
exitstatus = EX_OSERR;
1043
perror("sigaction");
1044
exitstatus = EXIT_FAILURE;
1287
1047
if(custom_argv != NULL){
1288
1048
for(char **arg = custom_argv+1; *arg != NULL; arg++){