1
/* -*- coding: utf-8 -*- */
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/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
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3
* Mandos plugin runner - Run Mandos plugins
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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
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* 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
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* Copyright © 2008-2018 Teddy Hogeborn
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* Copyright © 2008-2018 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
13
16
* WITHOUT ANY WARRANTY; without even the implied warranty of
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17
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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18
* General Public License for more details.
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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/>.
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* 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
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#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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#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 <stdio.h> /* fileno(), fprintf(),
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stderr, STDOUT_FILENO, fclose() */
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#include <sys/types.h> /* fstat(), struct stat, waitpid(),
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WIFEXITED(), WEXITSTATUS(), wait(),
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pid_t, uid_t, gid_t, getuid(),
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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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WEXITSTATUS(), WTERMSIG() */
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#include <sys/stat.h> /* struct stat, fstat(), 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(),
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#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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57
#include <errno.h> /* errno */
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58
#include <argp.h> /* struct argp_option, struct
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argp_state, struct argp,
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60
argp_parse(), ARGP_ERR_UNKNOWN,
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ARGP_KEY_END, ARGP_KEY_ARG, error_t */
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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() */
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SIG_UNBLOCK, kill(), sig_atomic_t
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#include <errno.h> /* errno, EBADF */
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#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
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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 <errno.h> /* errno */
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#include <error.h> /* error() */
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#include <fnmatch.h> /* fnmatch() */
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#define BUFFER_SIZE 256
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#define ARGFILE "/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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typedef struct process{
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#define PDIR "/lib/mandos/plugins.d"
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#define PHDIR "/lib/mandos/plugin-helpers"
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#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
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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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char *name; /* can be NULL or any plugin name */
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{ .name = "global-options", .key = 'g',
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.arg = "OPTION[,OPTION[,...]]",
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.doc = "Options passed to all plugins" },
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{ .name = "global-envs", .key = 'e',
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{ .name = "global-env", .key = 'G',
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391
.arg = "VAR=value",
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.doc = "Environment variable passed to all plugins" },
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{ .name = "options-for", .key = 'o',
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.arg = "PLUGIN:OPTION[,OPTION[,...]]",
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.doc = "Options passed only to specified plugin" },
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{ .name = "envs-for", .key = 'f',
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{ .name = "env-for", .key = 'E',
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.arg = "PLUGIN:ENV=value",
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.doc = "Environment variable passed to specified plugin" },
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{ .name = "disable", .key = 'd',
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.doc = "Disable a specific plugin", .group = 1 },
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{ .name = "enable", .key = 'e',
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.doc = "Enable a specific plugin", .group = 1 },
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{ .name = "plugin-dir", .key = 128,
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406
.arg = "DIRECTORY",
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.doc = "Specify a different plugin directory", .group = 2 },
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{ .name = "userid", .key = 129,
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.arg = "ID", .flags = 0,
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.doc = "User ID the plugins will run as", .group = 2 },
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{ .name = "groupid", .key = 130,
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.arg = "ID", .flags = 0,
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.doc = "Group ID the plugins will run as", .group = 2 },
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{ .name = "debug", .key = 131,
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.doc = "Debug mode", .group = 3 },
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{ .name = "config-file", .key = 129,
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.doc = "Specify a different configuration file", .group = 2 },
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{ .name = "userid", .key = 130,
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.arg = "ID", .flags = 0,
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.doc = "User ID the plugins will run as", .group = 3 },
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{ .name = "groupid", .key = 131,
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.arg = "ID", .flags = 0,
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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
426
{ .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, struct argp_state *state) {
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/* Get the INPUT argument from `argp_parse', which we know is a
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pointer to our plugin list pointer. */
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plugin **plugins = state->input;
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while((p = strsep(&arg, ",")) != NULL){
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if(not add_argument(getplugin(NULL, plugins), p)){
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perror("add_argument");
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return ARGP_ERR_UNKNOWN;
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char *envdef = strdup(arg);
369
if(not add_environment(getplugin(NULL, plugins), envdef)){
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perror("add_environment");
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char *p_name = strsep(&arg, ":");
377
if(p_name[0] == '\0'){
380
char *opt = strsep(&arg, ":");
386
while((p = strsep(&opt, ",")) != NULL){
390
if(not add_argument(getplugin(p_name, plugins), p)){
391
perror("add_argument");
392
return ARGP_ERR_UNKNOWN;
435
__attribute__((nonnull(3)))
436
error_t parse_opt(int key, char *arg, struct argp_state *state){
441
case 'g': /* --global-options */
444
while((plugin_option = strsep(&arg, ",")) != NULL){
445
if(not add_argument(getplugin(NULL), plugin_option)){
452
case 'G': /* --global-env */
453
if(add_environment(getplugin(NULL), arg, true)){
457
case 'o': /* --options-for */
459
char *option_list = strchr(arg, ':');
460
if(option_list == NULL){
461
argp_error(state, "No colon in \"%s\"", arg);
468
argp_error(state, "Empty plugin name");
473
while((option = strsep(&option_list, ",")) != NULL){
474
if(not add_argument(getplugin(arg), option)){
481
case 'E': /* --env-for */
403
483
char *envdef = strchr(arg, ':');
404
484
if(envdef == NULL){
407
char *p_name = strndup(arg, (size_t) (envdef-arg));
485
argp_error(state, "No colon in \"%s\"", arg);
412
if(not add_environment(getplugin(p_name, plugins), envdef)){
413
perror("add_environment");
419
plugin *p = getplugin(arg, plugins);
421
return ARGP_ERR_UNKNOWN;
430
uid = (uid_t)strtol(arg, NULL, 10);
433
gid = (gid_t)strtol(arg, NULL, 10);
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argp_error(state, "Empty plugin name");
496
if(add_environment(getplugin(arg), envdef, true)){
501
case 'd': /* --disable */
503
plugin *p = getplugin(arg);
510
case 'e': /* --enable */
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plugin *p = getplugin(arg);
519
case 128: /* --plugin-dir */
521
plugindir = strdup(arg);
522
if(plugindir != NULL){
526
case 129: /* --config-file */
527
/* This is already done by parse_opt_config_file() */
529
case 130: /* --userid */
530
tmp_id = strtoimax(arg, &tmp, 10);
531
if(errno != 0 or tmp == arg or *tmp != '\0'
532
or tmp_id != (uid_t)tmp_id){
533
argp_error(state, "Bad user ID number: \"%s\", using %"
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PRIdMAX, arg, (intmax_t)uid);
540
case 131: /* --groupid */
541
tmp_id = strtoimax(arg, &tmp, 10);
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if(errno != 0 or tmp == arg or *tmp != '\0'
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or tmp_id != (gid_t)tmp_id){
544
argp_error(state, "Bad group ID number: \"%s\", using %"
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PRIdMAX, arg, (intmax_t)gid);
551
case 132: /* --debug */
439
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
444
return ARGP_ERR_UNKNOWN;
449
plugin *plugin_list = NULL;
451
struct argp argp = { .options = options, .parser = parse_opt,
452
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
554
case 133: /* --plugin-helper-dir */
555
free(pluginhelperdir);
556
pluginhelperdir = strdup(arg);
557
if(pluginhelperdir != NULL){
562
* These reproduce what we would get without ARGP_NO_HELP
564
case '?': /* --help */
565
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
566
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
567
case -3: /* --usage */
568
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
569
argp_state_help(state, state->out_stream,
570
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
571
case 'V': /* --version */
572
fprintf(state->out_stream, "%s\n", argp_program_version);
576
* When adding more options before this line, remember to also add a
577
* "case" to the "parse_opt_config_file" function below.
580
/* Cryptsetup always passes an argument, which is an empty
581
string if "none" was specified in /etc/crypttab. So if
582
argument was empty, we ignore it silently. */
587
return ARGP_ERR_UNKNOWN;
589
return errno; /* Set to 0 at start */
592
/* This option parser is the same as parse_opt() above, except it
593
ignores everything but the --config-file option. */
594
error_t parse_opt_config_file(int key, char *arg,
595
__attribute__((unused))
596
struct argp_state *state){
599
case 'g': /* --global-options */
600
case 'G': /* --global-env */
601
case 'o': /* --options-for */
602
case 'E': /* --env-for */
603
case 'd': /* --disable */
604
case 'e': /* --enable */
605
case 128: /* --plugin-dir */
607
case 129: /* --config-file */
609
argfile = strdup(arg);
614
case 130: /* --userid */
615
case 131: /* --groupid */
616
case 132: /* --debug */
617
case 133: /* --plugin-helper-dir */
618
case '?': /* --help */
619
case -3: /* --usage */
620
case 'V': /* --version */
624
return ARGP_ERR_UNKNOWN;
629
struct argp argp = { .options = options,
630
.parser = parse_opt_config_file,
453
632
.doc = "Mandos plugin runner -- Run plugins" };
455
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
456
if (ret == ARGP_ERR_UNKNOWN){
457
fprintf(stderr, "Unknown error while parsing arguments\n");
458
exitstatus = EXIT_FAILURE;
462
conffp = fopen(argfile, "r");
634
/* Parse using parse_opt_config_file() in order to get the custom
635
config file location, if any. */
636
ret = argp_parse(&argp, argc, argv,
637
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
645
error(0, errno, "argp_parse");
646
exitstatus = EX_OSERR;
649
exitstatus = EX_USAGE;
653
/* Reset to the normal argument parser */
654
argp.parser = parse_opt;
656
/* Open the configfile if available */
658
conffp = fopen(AFILE, "r");
660
conffp = fopen(argfile, "r");
463
662
if(conffp != NULL){
464
663
char *org_line = NULL;
465
664
char *p, *arg, *new_arg, *line;
468
666
const char whitespace_delims[] = " \r\t\f\v\n";
469
667
const char comment_delim[] = "#";
670
custom_argv = malloc(sizeof(char*) * 2);
671
if(custom_argv == NULL){
672
error(0, errno, "malloc");
673
exitstatus = EX_OSERR;
676
custom_argv[0] = argv[0];
677
custom_argv[1] = NULL;
679
/* for each line in the config file, strip whitespace and ignore
472
682
sret = getline(&org_line, &size, conffp);
478
688
arg = strsep(&line, comment_delim);
479
689
while((p = strsep(&arg, whitespace_delims)) != NULL){
483
693
new_arg = strdup(p);
484
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
485
if (custom_argv == NULL){
486
perror("add_to_argv");
487
exitstatus = EXIT_FAILURE;
695
error(0, errno, "strdup");
696
exitstatus = EX_OSERR;
703
char **new_argv = realloc(custom_argv, sizeof(char *)
704
* ((size_t)custom_argc + 1));
705
if(new_argv == NULL){
706
error(0, errno, "realloc");
707
exitstatus = EX_OSERR;
712
custom_argv = new_argv;
715
custom_argv[custom_argc-1] = new_arg;
716
custom_argv[custom_argc] = NULL;
720
ret = fclose(conffp);
721
} while(ret == EOF and errno == EINTR);
723
error(0, errno, "fclose");
724
exitstatus = EX_IOERR;
494
729
/* Check for harmful errors and go to fallback. Other errors might
495
730
not affect opening plugins */
496
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
498
exitstatus = EXIT_FAILURE;
731
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
732
error(0, errno, "fopen");
733
exitstatus = EX_OSERR;
737
/* If there were any arguments from the configuration file, pass
738
them to parser as command line arguments */
503
739
if(custom_argv != NULL){
504
custom_argv[0] = argv[0];
505
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
506
if (ret == ARGP_ERR_UNKNOWN){
507
fprintf(stderr, "Unknown error while parsing arguments\n");
508
exitstatus = EXIT_FAILURE;
740
ret = argp_parse(&argp, custom_argc, custom_argv,
741
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
749
error(0, errno, "argp_parse");
750
exitstatus = EX_OSERR;
753
exitstatus = EX_CONFIG;
758
/* Parse actual command line arguments, to let them override the
760
ret = argp_parse(&argp, argc, argv,
761
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
769
error(0, errno, "argp_parse");
770
exitstatus = EX_OSERR;
773
exitstatus = EX_USAGE;
778
char *pluginhelperenv;
780
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
781
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
783
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
785
if(ret == -1 or not bret){
786
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
787
" environment variable to \"%s\" for all plugins\n",
788
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
791
free(pluginhelperenv);
514
for(plugin *p = plugin_list; p != NULL; p=p->next){
796
for(plugin *p = plugin_list; p != NULL; p = p->next){
515
797
fprintf(stderr, "Plugin: %s has %d arguments\n",
516
798
p->name ? p->name : "Global", p->argc - 1);
517
799
for(char **a = p->argv; *a != NULL; a++){
518
800
fprintf(stderr, "\tArg: %s\n", *a);
520
fprintf(stderr, "...and %u environment variables\n", p->envc);
802
fprintf(stderr, "...and %d environment variables\n", p->envc);
521
803
for(char **a = p->environ; *a != NULL; a++){
522
804
fprintf(stderr, "\t%s\n", *a);
810
/* Work around Debian bug #633582:
811
<https://bugs.debian.org/633582> */
812
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
813
if(plugindir_fd == -1){
815
error(0, errno, "open(\"" PDIR "\")");
818
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
820
error(0, errno, "fstat");
822
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
823
ret = fchown(plugindir_fd, uid, gid);
825
error(0, errno, "fchown");
833
/* Lower permissions */
836
error(0, errno, "setgid");
527
838
ret = setuid(uid);
537
dir = opendir(plugindir);
539
perror("Could not open plugin dir");
540
exitstatus = EXIT_FAILURE;
544
/* Set the FD_CLOEXEC flag on the directory, if possible */
840
error(0, errno, "setuid");
843
/* Open plugin directory with close_on_exec flag */
546
int dir_fd = dirfd(dir);
548
ret = set_cloexec_flag(dir_fd);
550
perror("set_cloexec_flag");
551
exitstatus = EXIT_FAILURE;
845
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
848
#else /* not O_CLOEXEC */
850
#endif /* not O_CLOEXEC */
853
error(0, errno, "Could not open plugin dir");
854
exitstatus = EX_UNAVAILABLE;
859
/* Set the FD_CLOEXEC flag on the directory */
860
ret = set_cloexec_flag(dir_fd);
862
error(0, errno, "set_cloexec_flag");
863
exitstatus = EX_OSERR;
866
#endif /* O_CLOEXEC */
869
int good_name(const struct dirent * const dirent){
870
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
871
"*.dpkg-old", "*.dpkg-bak",
872
"*.dpkg-divert", NULL };
874
#pragma GCC diagnostic push
875
#pragma GCC diagnostic ignored "-Wcast-qual"
877
for(const char **pat = (const char **)patterns;
878
*pat != NULL; pat++){
880
#pragma GCC diagnostic pop
882
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
885
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
886
" matching pattern %s\n", dirent->d_name, *pat);
894
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
896
if(numplugins == -1){
897
error(0, errno, "Could not scan plugin dir");
899
exitstatus = EX_OSERR;
557
903
FD_ZERO(&rfds_all);
560
dirst = readdir(dir);
562
// All directory entries have been processed
566
exitstatus = EXIT_FAILURE;
572
d_name_len = strlen(dirst->d_name);
574
// Ignore dotfiles, backup files and other junk
576
bool bad_name = false;
578
const char const *bad_prefixes[] = { ".", "#", NULL };
580
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
582
".dpkg-divert", NULL };
583
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
584
size_t pre_len = strlen(*pre);
585
if((d_name_len >= pre_len)
586
and strncmp((dirst->d_name), *pre, pre_len) == 0){
588
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
589
" with bad prefix %s\n", dirst->d_name, *pre);
600
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
601
size_t suf_len = strlen(*suf);
602
if((d_name_len >= suf_len)
603
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
606
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
607
" with bad suffix %s\n", dirst->d_name, *suf);
620
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
626
ret = stat(filename, &st);
633
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
905
/* Read and execute any executable in the plugin directory*/
906
for(int i = 0; i < numplugins; i++){
908
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
910
error(0, errno, "Could not open plugin");
914
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
916
error(0, errno, "stat");
922
/* Ignore non-executable files */
923
if(not S_ISREG(st.st_mode)
924
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
635
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
636
" with bad type or mode\n", filename);
927
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
928
" with bad type or mode\n",
929
plugindir != NULL ? plugindir : PDIR,
930
direntries[i]->d_name);
641
plugin *p = getplugin(dirst->d_name, &plugin_list);
937
plugin *p = getplugin(direntries[i]->d_name);
939
error(0, errno, "getplugin");
649
946
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
947
direntries[i]->d_name);
656
954
/* Add global arguments to argument list for this plugin */
657
plugin *g = getplugin(NULL, &plugin_list);
955
plugin *g = getplugin(NULL);
659
957
for(char **a = g->argv + 1; *a != NULL; a++){
660
958
if(not add_argument(p, *a)){
661
perror("add_argument");
959
error(0, errno, "add_argument");
664
962
/* Add global environment variables */
665
963
for(char **e = g->environ; *e != NULL; e++){
666
if(not add_environment(p, *e)){
667
perror("add_environment");
964
if(not add_environment(p, *e, false)){
965
error(0, errno, "add_environment");
672
/* If this plugin has any environment variables, we will call
673
using execve and need to duplicate the environment from this
970
/* If this plugin has any environment variables, we need to
971
duplicate the environment from this process, too. */
675
972
if(p->environ[0] != NULL){
676
973
for(char **e = environ; *e != NULL; e++){
677
char *copy = strdup(*e);
682
if(not add_environment(p, copy)){
683
perror("add_environment");
974
if(not add_environment(p, *e, false)){
975
error(0, errno, "add_environment");
692
exitstatus = EXIT_FAILURE;
982
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
983
#else /* O_CLOEXEC */
984
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
985
#endif /* O_CLOEXEC */
987
error(0, errno, "pipe");
988
exitstatus = EX_OSERR;
992
if(pipefd[0] >= FD_SETSIZE){
993
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
997
exitstatus = EX_OSERR;
1002
/* Ask OS to automatic close the pipe on exec */
695
1003
ret = set_cloexec_flag(pipefd[0]);
697
perror("set_cloexec_flag");
698
exitstatus = EXIT_FAILURE;
1005
error(0, errno, "set_cloexec_flag");
1008
exitstatus = EX_OSERR;
1009
free(direntries[i]);
701
1012
ret = set_cloexec_flag(pipefd[1]);
703
perror("set_cloexec_flag");
704
exitstatus = EXIT_FAILURE;
1014
error(0, errno, "set_cloexec_flag");
1017
exitstatus = EX_OSERR;
1018
free(direntries[i]);
1021
#endif /* not O_CLOEXEC */
707
1022
/* Block SIGCHLD until process is safely in process list */
708
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1023
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1024
&sigchld_action.sa_mask,
710
perror("sigprocmask");
711
exitstatus = EXIT_FAILURE;
1027
error(0, errno, "sigprocmask");
1028
exitstatus = EX_OSERR;
1029
free(direntries[i]);
714
// Starting a new process to be watched
1032
/* Starting a new process to be watched */
1036
} while(pid == -1 and errno == EINTR);
718
exitstatus = EXIT_FAILURE;
1038
error(0, errno, "fork");
1039
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1040
&sigchld_action.sa_mask, NULL));
1043
exitstatus = EX_OSERR;
1044
free(direntries[i]);
722
1048
/* this is the child process */
723
1049
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1051
error(0, errno, "sigaction");
728
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1054
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
730
perror("sigprocmask");
1056
error(0, errno, "sigprocmask");
734
1060
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1062
error(0, errno, "dup2");
741
/* If dir has no file descriptor, we could not set FD_CLOEXEC
742
above and must now close it manually here. */
745
if(p->environ[0] == NULL){
746
if(execv(filename, p->argv) < 0){
751
if(execve(filename, p->argv, p->environ) < 0){
1066
if(fexecve(plugin_fd, p->argv,
1067
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1068
error(0, errno, "fexecve for %s/%s",
1069
plugindir != NULL ? plugindir : PDIR,
1070
direntries[i]->d_name);
760
close(pipefd[1]); /* close unused write end of pipe */
761
process *new_process = malloc(sizeof(process));
762
if (new_process == NULL){
764
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1075
/* Parent process */
1076
close(pipefd[1]); /* Close unused write end of pipe */
1078
plugin *new_plugin = getplugin(direntries[i]->d_name);
1079
if(new_plugin == NULL){
1080
error(0, errno, "getplugin");
1081
ret = (int)(TEMP_FAILURE_RETRY
1082
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
766
perror("sigprocmask");
1085
error(0, errno, "sigprocmask");
768
exitstatus = EXIT_FAILURE;
1087
exitstatus = EX_OSERR;
1088
free(direntries[i]);
772
*new_process = (struct process){ .pid = pid,
774
.next = process_list };
776
process_list = new_process;
1091
free(direntries[i]);
1093
new_plugin->pid = pid;
1094
new_plugin->fd = pipefd[0];
777
1096
/* Unblock SIGCHLD so signal handler can be run if this process
778
1097
has already completed */
779
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1098
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1099
&sigchld_action.sa_mask,
781
perror("sigprocmask");
782
exitstatus = EXIT_FAILURE;
1102
error(0, errno, "sigprocmask");
1103
exitstatus = EX_OSERR;
786
FD_SET(new_process->fd, &rfds_all);
788
if (maxfd < new_process->fd){
789
maxfd = new_process->fd;
794
free_plugin_list(plugin_list);
799
if (process_list == NULL){
800
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1107
FD_SET(new_plugin->fd, &rfds_all);
1109
if(maxfd < new_plugin->fd){
1110
maxfd = new_plugin->fd;
1118
free_plugin(getplugin(NULL));
1120
for(plugin *p = plugin_list; p != NULL; p = p->next){
1124
if(p->next == NULL){
1125
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1131
/* Main loop while running plugins exist */
805
1133
fd_set rfds = rfds_all;
806
1134
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
807
if (select_ret == -1){
809
exitstatus = EXIT_FAILURE;
1135
if(select_ret == -1 and errno != EINTR){
1136
error(0, errno, "select");
1137
exitstatus = EX_OSERR;
812
1140
/* OK, now either a process completed, or something can be read
813
1141
from one of them */
814
for(process *proc = process_list; proc ; proc = proc->next){
1142
for(plugin *proc = plugin_list; proc != NULL;){
815
1143
/* Is this process completely done? */
816
if(proc->eof and proc->completed){
1144
if(proc->completed and proc->eof){
817
1145
/* Only accept the plugin output if it exited cleanly */
818
1146
if(not WIFEXITED(proc->status)
819
1147
or WEXITSTATUS(proc->status) != 0){
820
1148
/* Bad exit by plugin */
822
1151
if(WIFEXITED(proc->status)){
823
fprintf(stderr, "Plugin %u exited with status %d\n",
824
(unsigned int) (proc->pid),
1152
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1153
" status %d\n", proc->name,
1154
(intmax_t) (proc->pid),
825
1155
WEXITSTATUS(proc->status));
826
} else if(WIFSIGNALED(proc->status)) {
827
fprintf(stderr, "Plugin %u killed by signal %d\n",
828
(unsigned int) (proc->pid),
829
WTERMSIG(proc->status));
830
} else if(WCOREDUMP(proc->status)){
831
fprintf(stderr, "Plugin %d dumped core\n",
832
(unsigned int) (proc->pid));
1156
} else if(WIFSIGNALED(proc->status)){
1157
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1158
" signal %d: %s\n", proc->name,
1159
(intmax_t) (proc->pid),
1160
WTERMSIG(proc->status),
1161
strsignal(WTERMSIG(proc->status)));
835
1165
/* Remove the plugin */
836
1166
FD_CLR(proc->fd, &rfds_all);
837
1168
/* Block signal while modifying process_list */
838
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1169
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1171
&sigchld_action.sa_mask,
840
perror("sigprocmask");
841
exitstatus = EXIT_FAILURE;
1174
error(0, errno, "sigprocmask");
1175
exitstatus = EX_OSERR;
844
/* Delete this process entry from the list */
845
if(process_list == proc){
846
/* First one - simple */
847
process_list = proc->next;
849
/* Second one or later */
850
for(process *p = process_list; p != NULL; p = p->next){
852
p->next = proc->next;
1179
plugin *next_plugin = proc->next;
857
1183
/* We are done modifying process list, so unblock signal */
858
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
1184
ret = (int)(TEMP_FAILURE_RETRY
1185
(sigprocmask(SIG_UNBLOCK,
1186
&sigchld_action.sa_mask, NULL)));
861
perror("sigprocmask");
865
/* We deleted this process from the list, so we can't go
866
proc->next. Therefore, start over from the beginning of
1188
error(0, errno, "sigprocmask");
1189
exitstatus = EX_OSERR;
1193
if(plugin_list == NULL){
870
1200
/* This process exited nicely, so print its buffer */
872
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1202
bool bret = print_out_password(proc->buffer,
1203
proc->buffer_length);
874
perror("print_out_password");
875
exitstatus = EXIT_FAILURE;
1205
error(0, errno, "print_out_password");
1206
exitstatus = EX_IOERR;
879
1211
/* This process has not completed. Does it have any output? */
880
1212
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
881
1213
/* This process had nothing to say at this time */
884
1217
/* Before reading, make the process' data buffer large enough */
885
1218
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
886
proc->buffer = realloc(proc->buffer, proc->buffer_size
887
+ (size_t) BUFFER_SIZE);
888
if (proc->buffer == NULL){
890
exitstatus = EXIT_FAILURE;
1219
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1220
+ (size_t) BUFFER_SIZE);
1221
if(new_buffer == NULL){
1222
error(0, errno, "malloc");
1223
exitstatus = EX_OSERR;
1226
proc->buffer = new_buffer;
893
1227
proc->buffer_size += BUFFER_SIZE;
895
1229
/* Read from the process */
896
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1230
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1232
+ proc->buffer_length,
899
1235
/* Read error from this process; ignore the error */
904
1241
proc->eof = true;
906
proc->buffer_length += (size_t) ret;
1243
proc->buffer_length += (size_t) sret;
914
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
915
/* Fallback if all plugins failed, none are found or an error occured */
1251
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1252
and exitstatus != EX_OK)){
1253
/* Fallback if all plugins failed, none are found or an error
917
1256
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
918
1257
char *passwordbuffer = getpass("Password: ");
919
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1258
size_t len = strlen(passwordbuffer);
1259
/* Strip trailing newline */
1260
if(len > 0 and passwordbuffer[len-1] == '\n'){
1261
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1264
bret = print_out_password(passwordbuffer, len);
921
perror("print_out_password");
922
exitstatus = EXIT_FAILURE;
1266
error(0, errno, "print_out_password");
1267
exitstatus = EX_IOERR;
926
1271
/* Restore old signal handler */
927
1272
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
930
exitstatus = EXIT_FAILURE;
1274
error(0, errno, "sigaction");
1275
exitstatus = EX_OSERR;
933
1278
if(custom_argv != NULL){
934
for(char **arg = custom_argv; *arg != NULL; arg++){
1279
for(char **arg = custom_argv+1; *arg != NULL; arg++){
937
1282
free(custom_argv);
939
free_plugin_list(plugin_list);
945
/* Free the process list and kill the processes */
946
for(process *next; process_list != NULL; process_list = next){
947
next = process_list->next;
948
close(process_list->fd);
949
ret = kill(process_list->pid, SIGTERM);
950
if(ret == -1 and errno != ESRCH){
951
/* set-uid proccesses migth not get closed */
1291
/* Kill the processes */
1292
for(plugin *p = plugin_list; p != NULL; p = p->next){
1295
ret = kill(p->pid, SIGTERM);
1296
if(ret == -1 and errno != ESRCH){
1297
/* Set-uid proccesses might not get closed */
1298
error(0, errno, "kill");
954
free(process_list->buffer);
958
1303
/* Wait for any remaining child processes to terminate */
960
1305
ret = wait(NULL);
961
1306
} while(ret >= 0);
962
1307
if(errno != ECHILD){
1308
error(0, errno, "wait");
1314
free(pluginhelperdir);
966
1317
return exitstatus;