3
3
* Mandos plugin runner - Run Mandos plugins
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
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* This program is free software: you can redistribute it and/or
9
* modify it under the terms of the GNU General Public License as
10
* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
13
* This program is distributed in the hope that it will be useful, but
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
14
16
* WITHOUT ANY WARRANTY; without even the implied warranty of
15
17
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16
18
* General Public License for more details.
18
20
* You should have received a copy of the GNU General Public License
19
* 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>.
23
* Contact the authors at <mandos@recompile.se>.
25
26
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
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28
#include <stddef.h> /* size_t, NULL */
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#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
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EXIT_SUCCESS, realloc() */
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#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
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31
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
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stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
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 <stdio.h> /* fileno(), fprintf(),
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stderr, STDOUT_FILENO, fclose() */
34
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
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WIFEXITED(), WEXITSTATUS(), wait(),
36
pid_t, uid_t, gid_t, getuid(),
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38
#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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WEXITSTATUS(), WTERMSIG(),
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#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
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WEXITSTATUS(), WTERMSIG() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
44
43
#include <iso646.h> /* and, or, not */
45
#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(),
44
#include <dirent.h> /* struct dirent, scandirat() */
45
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
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FD_CLOEXEC, write(), STDOUT_FILENO,
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struct stat, fstat(), close(),
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setgid(), setuid(), S_ISREG(),
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faccessat() pipe2(), fork(),
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_exit(), dup2(), fexecve(), read()
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#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
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#include <string.h> /* strsep, strlen(), asprintf(),
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FD_CLOEXEC, openat(), scandirat(),
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#include <string.h> /* strsep, strlen(), strsignal(),
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strcmp(), strncmp() */
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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,
394
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.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
427
{ .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 },
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{ .name = "version", .key = 'V',
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.doc = "Print program version", .group = -1 },
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error_t parse_opt(int key, char *arg, __attribute__((unused))
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struct argp_state *state){
436
__attribute__((nonnull(3)))
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error_t parse_opt(int key, char *arg, struct argp_state *state){
405
442
case 'g': /* --global-options */
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char *plugin_option;
408
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while((plugin_option = strsep(&arg, ",")) != NULL){
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if(plugin_option[0] == '\0'){
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if(not add_argument(getplugin(NULL), plugin_option)){
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perror("add_argument");
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return ARGP_ERR_UNKNOWN;
419
453
case 'G': /* --global-env */
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if(not add_environment(getplugin(NULL), arg, true)){
424
perror("add_environment");
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if(add_environment(getplugin(NULL), arg, true)){
427
458
case 'o': /* --options-for */
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char *plugin_name = strsep(&arg, ":");
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if(plugin_name[0] == '\0'){
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while((plugin_option = strsep(&arg, ",")) != NULL){
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if(not add_argument(getplugin(plugin_name), plugin_option)){
436
perror("add_argument");
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return ARGP_ERR_UNKNOWN;
460
char *option_list = strchr(arg, ':');
461
if(option_list == NULL){
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argp_error(state, "No colon in \"%s\"", arg);
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argp_error(state, "Empty plugin name");
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while((option = strsep(&option_list, ",")) != NULL){
475
if(not add_argument(getplugin(arg), option)){
442
482
case 'E': /* --env-for */
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char *envdef = strchr(arg, ':');
448
485
if(envdef == NULL){
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argp_error(state, "No colon in \"%s\"", arg);
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if(not add_environment(getplugin(arg), envdef+1, true)){
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perror("add_environment");
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argp_error(state, "Empty plugin name");
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if(add_environment(getplugin(arg), envdef, true)){
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502
case 'd': /* --disable */
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plugin *p = getplugin(arg);
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return ARGP_ERR_UNKNOWN;
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511
case 'e': /* --enable */
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plugin *p = getplugin(arg);
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return ARGP_ERR_UNKNOWN;
475
520
case 128: /* --plugin-dir */
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plugindir = strdup(arg);
478
if(plugindir == NULL){
523
if(plugindir != NULL){
482
527
case 129: /* --config-file */
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/* This is already done by parse_opt_config_file() */
485
530
case 130: /* --userid */
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tmpmax = strtoimax(arg, &tmp, 10);
531
tmp_id = strtoimax(arg, &tmp, 10);
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if(errno != 0 or tmp == arg or *tmp != '\0'
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or tmpmax != (uid_t)tmpmax){
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fprintf(stderr, "Bad user ID number: \"%s\", using %"
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PRIdMAX "\n", arg, (intmax_t)uid);
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or tmp_id != (uid_t)tmp_id){
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argp_error(state, "Bad user ID number: \"%s\", using %"
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PRIdMAX, arg, (intmax_t)uid);
496
541
case 131: /* --groupid */
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tmpmax = strtoimax(arg, &tmp, 10);
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tmp_id = strtoimax(arg, &tmp, 10);
499
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if(errno != 0 or tmp == arg or *tmp != '\0'
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or tmpmax != (gid_t)tmpmax){
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fprintf(stderr, "Bad group ID number: \"%s\", using %"
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PRIdMAX "\n", arg, (intmax_t)gid);
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or tmp_id != (gid_t)tmp_id){
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argp_error(state, "Bad group ID number: \"%s\", using %"
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PRIdMAX, arg, (intmax_t)gid);
507
552
case 132: /* --debug */
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case 133: /* --plugin-helper-dir */
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free(pluginhelperdir);
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pluginhelperdir = strdup(arg);
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if(pluginhelperdir != NULL){
563
* These reproduce what we would get without ARGP_NO_HELP
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case '?': /* --help */
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state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
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argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
568
case -3: /* --usage */
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state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
570
argp_state_help(state, state->out_stream,
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ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
572
case 'V': /* --version */
573
fprintf(state->out_stream, "%s\n", argp_program_version);
511
577
* When adding more options before this line, remember to also add a
512
578
* "case" to the "parse_opt_config_file" function below.
648
730
/* Check for harmful errors and go to fallback. Other errors might
649
731
not affect opening plugins */
650
732
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
652
exitstatus = EXIT_FAILURE;
733
error(0, errno, "fopen");
734
exitstatus = EX_OSERR;
656
/* If there was any arguments from configuration file,
657
pass them to parser as command arguments */
738
/* If there were any arguments from the configuration file, pass
739
them to parser as command line arguments */
658
740
if(custom_argv != NULL){
659
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
661
if(ret == ARGP_ERR_UNKNOWN){
662
fprintf(stderr, "Unknown error while parsing arguments\n");
663
exitstatus = EXIT_FAILURE;
741
ret = argp_parse(&argp, custom_argc, custom_argv,
742
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
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error(0, errno, "argp_parse");
751
exitstatus = EX_OSERR;
754
exitstatus = EX_CONFIG;
668
759
/* Parse actual command line arguments, to let them override the
670
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
671
if(ret == ARGP_ERR_UNKNOWN){
672
fprintf(stderr, "Unknown error while parsing arguments\n");
673
exitstatus = EXIT_FAILURE;
761
ret = argp_parse(&argp, argc, argv,
762
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
770
error(0, errno, "argp_parse");
771
exitstatus = EX_OSERR;
774
exitstatus = EX_USAGE;
779
char *pluginhelperenv;
781
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
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pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
784
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
786
if(ret == -1 or not bret){
787
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
788
" environment variable to \"%s\" for all plugins\n",
789
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
792
free(pluginhelperenv);
678
for(plugin *p = plugin_list; p != NULL; p=p->next){
797
for(plugin *p = plugin_list; p != NULL; p = p->next){
679
798
fprintf(stderr, "Plugin: %s has %d arguments\n",
680
799
p->name ? p->name : "Global", p->argc - 1);
681
800
for(char **a = p->argv; *a != NULL; a++){
691
/* Strip permissions down to nobody */
811
/* Work around Debian bug #633582:
812
<https://bugs.debian.org/633582> */
813
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
814
if(plugindir_fd == -1){
816
error(0, errno, "open(\"" PDIR "\")");
819
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
821
error(0, errno, "fstat");
823
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
824
ret = fchown(plugindir_fd, uid, gid);
826
error(0, errno, "fchown");
834
/* Lower permissions */
837
error(0, errno, "setgid");
696
839
ret = setuid(uid);
701
if(plugindir == NULL){
704
dir = opendir(plugindir);
708
perror("Could not open plugin dir");
709
exitstatus = EXIT_FAILURE;
713
/* Set the FD_CLOEXEC flag on the directory, if possible */
841
error(0, errno, "setuid");
844
/* Open plugin directory with close_on_exec flag */
715
int dir_fd = dirfd(dir);
717
ret = set_cloexec_flag(dir_fd);
719
perror("set_cloexec_flag");
720
exitstatus = EXIT_FAILURE;
846
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
849
#else /* not O_CLOEXEC */
851
#endif /* not O_CLOEXEC */
854
error(0, errno, "Could not open plugin dir");
855
exitstatus = EX_UNAVAILABLE;
860
/* Set the FD_CLOEXEC flag on the directory */
861
ret = set_cloexec_flag(dir_fd);
863
error(0, errno, "set_cloexec_flag");
864
exitstatus = EX_OSERR;
867
#endif /* O_CLOEXEC */
870
int good_name(const struct dirent * const dirent){
871
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
872
"*.dpkg-old", "*.dpkg-bak",
873
"*.dpkg-divert", NULL };
875
#pragma GCC diagnostic push
876
#pragma GCC diagnostic ignored "-Wcast-qual"
878
for(const char **pat = (const char **)patterns;
879
*pat != NULL; pat++){
881
#pragma GCC diagnostic pop
883
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
886
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
887
" matching pattern %s\n", dirent->d_name, *pat);
895
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
897
if(numplugins == -1){
898
error(0, errno, "Could not scan plugin dir");
900
exitstatus = EX_OSERR;
726
904
FD_ZERO(&rfds_all);
728
906
/* Read and execute any executable in the plugin directory*/
731
dirst = readdir(dir);
732
} while(dirst == NULL and errno == EINTR);
734
/* All directory entries have been processed */
738
exitstatus = EXIT_FAILURE;
744
d_name_len = strlen(dirst->d_name);
746
/* Ignore dotfiles, backup files and other junk */
748
bool bad_name = false;
750
const char const *bad_prefixes[] = { ".", "#", NULL };
752
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
755
".dpkg-divert", NULL };
756
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
757
size_t pre_len = strlen(*pre);
758
if((d_name_len >= pre_len)
759
and strncmp((dirst->d_name), *pre, pre_len) == 0){
761
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
762
" with bad prefix %s\n", dirst->d_name, *pre);
771
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
772
size_t suf_len = strlen(*suf);
773
if((d_name_len >= suf_len)
774
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
777
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
778
" with bad suffix %s\n", dirst->d_name, *suf);
791
if(plugindir == NULL){
792
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
795
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
907
for(int i = 0; i < numplugins; i++){
909
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
911
error(0, errno, "Could not open plugin");
804
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
915
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
917
error(0, errno, "stat");
811
923
/* Ignore non-executable files */
812
924
if(not S_ISREG(st.st_mode)
813
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
925
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
815
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
816
" with bad type or mode\n", filename);
928
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
929
" with bad type or mode\n",
930
plugindir != NULL ? plugindir : PDIR,
931
direntries[i]->d_name);
822
plugin *p = getplugin(dirst->d_name);
938
plugin *p = getplugin(direntries[i]->d_name);
940
error(0, errno, "getplugin");
830
947
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
948
direntries[i]->d_name);
840
958
for(char **a = g->argv + 1; *a != NULL; a++){
841
959
if(not add_argument(p, *a)){
842
perror("add_argument");
960
error(0, errno, "add_argument");
845
963
/* Add global environment variables */
846
964
for(char **e = g->environ; *e != NULL; e++){
847
965
if(not add_environment(p, *e, false)){
848
perror("add_environment");
966
error(0, errno, "add_environment");
853
/* If this plugin has any environment variables, we will call
854
using execve and need to duplicate the environment from this
971
/* If this plugin has any environment variables, we need to
972
duplicate the environment from this process, too. */
856
973
if(p->environ[0] != NULL){
857
974
for(char **e = environ; *e != NULL; e++){
858
975
if(not add_environment(p, *e, false)){
859
perror("add_environment");
976
error(0, errno, "add_environment");
865
983
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
984
#else /* O_CLOEXEC */
985
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
986
#endif /* O_CLOEXEC */
868
exitstatus = EXIT_FAILURE;
988
error(0, errno, "pipe");
989
exitstatus = EX_OSERR;
993
if(pipefd[0] >= FD_SETSIZE){
994
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
998
exitstatus = EX_OSERR;
871
1003
/* Ask OS to automatic close the pipe on exec */
872
1004
ret = set_cloexec_flag(pipefd[0]);
874
perror("set_cloexec_flag");
875
exitstatus = EXIT_FAILURE;
1006
error(0, errno, "set_cloexec_flag");
1009
exitstatus = EX_OSERR;
1010
free(direntries[i]);
878
1013
ret = set_cloexec_flag(pipefd[1]);
880
perror("set_cloexec_flag");
881
exitstatus = EXIT_FAILURE;
1015
error(0, errno, "set_cloexec_flag");
1018
exitstatus = EX_OSERR;
1019
free(direntries[i]);
1022
#endif /* not O_CLOEXEC */
884
1023
/* Block SIGCHLD until process is safely in process list */
885
1024
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
886
1025
&sigchld_action.sa_mask,
889
perror("sigprocmask");
890
exitstatus = EXIT_FAILURE;
1028
error(0, errno, "sigprocmask");
1029
exitstatus = EX_OSERR;
1030
free(direntries[i]);
893
1033
/* Starting a new process to be watched */
897
1037
} while(pid == -1 and errno == EINTR);
900
exitstatus = EXIT_FAILURE;
1039
error(0, errno, "fork");
1040
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1041
&sigchld_action.sa_mask, NULL));
1044
exitstatus = EX_OSERR;
1045
free(direntries[i]);
904
1049
/* this is the child process */
905
1050
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1052
error(0, errno, "sigaction");
910
1055
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
912
perror("sigprocmask");
1057
error(0, errno, "sigprocmask");
916
1061
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1063
error(0, errno, "dup2");
923
/* If dir has no file descriptor, we could not set FD_CLOEXEC
924
above and must now close it manually here. */
927
if(p->environ[0] == NULL){
928
if(execv(filename, p->argv) < 0){
933
if(execve(filename, p->argv, p->environ) < 0){
1067
if(fexecve(plugin_fd, p->argv,
1068
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1069
error(0, errno, "fexecve for %s/%s",
1070
plugindir != NULL ? plugindir : PDIR,
1071
direntries[i]->d_name);
940
1076
/* Parent process */
941
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
944
plugin *new_plugin = getplugin(dirst->d_name);
1077
close(pipefd[1]); /* Close unused write end of pipe */
1079
plugin *new_plugin = getplugin(direntries[i]->d_name);
945
1080
if(new_plugin == NULL){
1081
error(0, errno, "getplugin");
947
1082
ret = (int)(TEMP_FAILURE_RETRY
948
1083
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
951
perror("sigprocmask");
1086
error(0, errno, "sigprocmask");
953
exitstatus = EXIT_FAILURE;
1088
exitstatus = EX_OSERR;
1089
free(direntries[i]);
1092
free(direntries[i]);
957
1094
new_plugin->pid = pid;
958
1095
new_plugin->fd = pipefd[0];