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
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* 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() */
42
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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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59
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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393
{ .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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405
{ .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);
341
if(not add_environment(getplugin(NULL, plugins), envdef)){
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perror("add_environment");
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char *p_name = strsep(&arg, ":");
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if(p_name[0] == '\0'){
352
char *opt = strsep(&arg, ":");
358
while((p = strsep(&opt, ",")) != NULL){
362
if(not add_argument(getplugin(p_name, plugins), p)){
363
perror("add_argument");
364
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 */
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while((plugin_option = strsep(&arg, ",")) != NULL){
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if(not add_argument(getplugin(NULL), plugin_option)){
452
case 'G': /* --global-env */
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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 */
375
483
char *envdef = strchr(arg, ':');
376
484
if(envdef == NULL){
379
char *p_name = strndup(arg, (size_t) (envdef-arg));
485
argp_error(state, "No colon in \"%s\"", arg);
384
if(not add_environment(getplugin(p_name, plugins), envdef)){
385
perror("add_environment");
391
plugin *p = getplugin(arg, plugins);
393
return ARGP_ERR_UNKNOWN;
402
uid = (uid_t)strtol(arg, NULL, 10);
405
gid = (gid_t)strtol(arg, NULL, 10);
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argp_error(state, "Empty plugin name");
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if(add_environment(getplugin(arg), envdef, true)){
501
case 'd': /* --disable */
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plugin *p = getplugin(arg);
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case 'e': /* --enable */
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plugin *p = getplugin(arg);
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case 128: /* --plugin-dir */
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plugindir = strdup(arg);
522
if(plugindir != NULL){
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case 129: /* --config-file */
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/* This is already done by parse_opt_config_file() */
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case 130: /* --userid */
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tmp_id = strtoimax(arg, &tmp, 10);
531
if(errno != 0 or tmp == arg or *tmp != '\0'
532
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);
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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){
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argp_error(state, "Bad group ID number: \"%s\", using %"
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PRIdMAX, arg, (intmax_t)gid);
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case 132: /* --debug */
411
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
416
return ARGP_ERR_UNKNOWN;
421
plugin *plugin_list = NULL;
423
struct argp argp = { .options = options, .parser = parse_opt,
424
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
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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. */
588
return ARGP_ERR_UNKNOWN;
590
return errno; /* Set to 0 at start */
593
/* This option parser is the same as parse_opt() above, except it
594
ignores everything but the --config-file option. */
595
error_t parse_opt_config_file(int key, char *arg,
596
__attribute__((unused))
597
struct argp_state *state){
600
case 'g': /* --global-options */
601
case 'G': /* --global-env */
602
case 'o': /* --options-for */
603
case 'E': /* --env-for */
604
case 'd': /* --disable */
605
case 'e': /* --enable */
606
case 128: /* --plugin-dir */
608
case 129: /* --config-file */
610
argfile = strdup(arg);
615
case 130: /* --userid */
616
case 131: /* --groupid */
617
case 132: /* --debug */
618
case 133: /* --plugin-helper-dir */
619
case '?': /* --help */
620
case -3: /* --usage */
621
case 'V': /* --version */
625
return ARGP_ERR_UNKNOWN;
630
struct argp argp = { .options = options,
631
.parser = parse_opt_config_file,
425
633
.doc = "Mandos plugin runner -- Run plugins" };
427
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
428
if (ret == ARGP_ERR_UNKNOWN){
429
fprintf(stderr, "Unknown error while parsing arguments\n");
430
exitstatus = EXIT_FAILURE;
434
conffp = fopen(argfile, "r");
635
/* Parse using parse_opt_config_file() in order to get the custom
636
config file location, if any. */
637
ret = argp_parse(&argp, argc, argv,
638
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
646
error(0, errno, "argp_parse");
647
exitstatus = EX_OSERR;
650
exitstatus = EX_USAGE;
654
/* Reset to the normal argument parser */
655
argp.parser = parse_opt;
657
/* Open the configfile if available */
659
conffp = fopen(AFILE, "r");
661
conffp = fopen(argfile, "r");
435
663
if(conffp != NULL){
436
664
char *org_line = NULL;
665
char *p, *arg, *new_arg, *line;
439
char *p, *arg, *new_arg, *line;
440
667
const char whitespace_delims[] = " \r\t\f\v\n";
441
668
const char comment_delim[] = "#";
671
custom_argv = malloc(sizeof(char*) * 2);
672
if(custom_argv == NULL){
673
error(0, errno, "malloc");
674
exitstatus = EX_OSERR;
677
custom_argv[0] = argv[0];
678
custom_argv[1] = NULL;
680
/* for each line in the config file, strip whitespace and ignore
444
683
sret = getline(&org_line, &size, conffp);
450
689
arg = strsep(&line, comment_delim);
451
690
while((p = strsep(&arg, whitespace_delims)) != NULL){
455
694
new_arg = strdup(p);
456
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
457
if (custom_argv == NULL){
458
perror("add_to_argv");
459
exitstatus = EXIT_FAILURE;
696
error(0, errno, "strdup");
697
exitstatus = EX_OSERR;
704
char **new_argv = realloc(custom_argv, sizeof(char *)
705
* ((size_t)custom_argc + 1));
706
if(new_argv == NULL){
707
error(0, errno, "realloc");
708
exitstatus = EX_OSERR;
713
custom_argv = new_argv;
716
custom_argv[custom_argc-1] = new_arg;
717
custom_argv[custom_argc] = NULL;
721
ret = fclose(conffp);
722
} while(ret == EOF and errno == EINTR);
724
error(0, errno, "fclose");
725
exitstatus = EX_IOERR;
466
730
/* Check for harmful errors and go to fallback. Other errors might
467
731
not affect opening plugins */
468
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
470
exitstatus = EXIT_FAILURE;
732
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
733
error(0, errno, "fopen");
734
exitstatus = EX_OSERR;
738
/* If there were any arguments from the configuration file, pass
739
them to parser as command line arguments */
475
740
if(custom_argv != NULL){
476
custom_argv[0] = argv[0];
477
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
478
if (ret == ARGP_ERR_UNKNOWN){
479
fprintf(stderr, "Unknown error while parsing arguments\n");
480
exitstatus = EXIT_FAILURE;
741
ret = argp_parse(&argp, custom_argc, custom_argv,
742
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
750
error(0, errno, "argp_parse");
751
exitstatus = EX_OSERR;
754
exitstatus = EX_CONFIG;
759
/* Parse actual command line arguments, to let them override the
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",
782
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);
486
for(plugin *p = plugin_list; p != NULL; p=p->next){
797
for(plugin *p = plugin_list; p != NULL; p = p->next){
487
798
fprintf(stderr, "Plugin: %s has %d arguments\n",
488
799
p->name ? p->name : "Global", p->argc - 1);
489
800
for(char **a = p->argv; *a != NULL; a++){
490
801
fprintf(stderr, "\tArg: %s\n", *a);
492
fprintf(stderr, "...and %u environment variables\n", p->envc);
803
fprintf(stderr, "...and %d environment variables\n", p->envc);
493
804
for(char **a = p->environ; *a != NULL; a++){
494
805
fprintf(stderr, "\t%s\n", *a);
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");
499
839
ret = setuid(uid);
509
dir = opendir(plugindir);
511
perror("Could not open plugin dir");
512
exitstatus = EXIT_FAILURE;
516
/* Set the FD_CLOEXEC flag on the directory, if possible */
841
error(0, errno, "setuid");
844
/* Open plugin directory with close_on_exec flag */
518
int dir_fd = dirfd(dir);
520
ret = set_cloexec_flag(dir_fd);
522
perror("set_cloexec_flag");
523
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;
529
904
FD_ZERO(&rfds_all);
532
dirst = readdir(dir);
534
// All directory entries have been processed
538
exitstatus = EXIT_FAILURE;
544
d_name_len = strlen(dirst->d_name);
546
// Ignore dotfiles, backup files and other junk
548
bool bad_name = false;
550
const char const *bad_prefixes[] = { ".", "#", NULL };
552
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
554
".dpkg-divert", NULL };
555
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
556
size_t pre_len = strlen(*pre);
557
if((d_name_len >= pre_len)
558
and strncmp((dirst->d_name), *pre, pre_len) == 0){
560
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
561
" with bad prefix %s\n", dirst->d_name, *pre);
572
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
573
size_t suf_len = strlen(*suf);
574
if((d_name_len >= suf_len)
575
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
578
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
579
" with bad suffix %s\n", dirst->d_name, *suf);
592
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
598
ret = stat(filename, &st);
605
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
906
/* Read and execute any executable in the plugin directory*/
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");
915
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
917
error(0, errno, "stat");
923
/* Ignore non-executable files */
924
if(not S_ISREG(st.st_mode)
925
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
607
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
608
" 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);
613
plugin *p = getplugin(dirst->d_name, &plugin_list);
938
plugin *p = getplugin(direntries[i]->d_name);
940
error(0, errno, "getplugin");
621
947
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
948
direntries[i]->d_name);
628
955
/* Add global arguments to argument list for this plugin */
629
plugin *g = getplugin(NULL, &plugin_list);
956
plugin *g = getplugin(NULL);
631
958
for(char **a = g->argv + 1; *a != NULL; a++){
632
959
if(not add_argument(p, *a)){
633
perror("add_argument");
960
error(0, errno, "add_argument");
636
963
/* Add global environment variables */
637
964
for(char **e = g->environ; *e != NULL; e++){
638
if(not add_environment(p, *e)){
639
perror("add_environment");
965
if(not add_environment(p, *e, false)){
966
error(0, errno, "add_environment");
644
/* If this plugin has any environment variables, we will call
645
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. */
647
973
if(p->environ[0] != NULL){
648
974
for(char **e = environ; *e != NULL; e++){
649
char *copy = strdup(*e);
654
if(not add_environment(p, copy)){
655
perror("add_environment");
975
if(not add_environment(p, *e, false)){
976
error(0, errno, "add_environment");
664
exitstatus = EXIT_FAILURE;
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 */
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;
1003
/* Ask OS to automatic close the pipe on exec */
667
1004
ret = set_cloexec_flag(pipefd[0]);
669
perror("set_cloexec_flag");
670
exitstatus = EXIT_FAILURE;
1006
error(0, errno, "set_cloexec_flag");
1009
exitstatus = EX_OSERR;
1010
free(direntries[i]);
673
1013
ret = set_cloexec_flag(pipefd[1]);
675
perror("set_cloexec_flag");
676
exitstatus = EXIT_FAILURE;
1015
error(0, errno, "set_cloexec_flag");
1018
exitstatus = EX_OSERR;
1019
free(direntries[i]);
1022
#endif /* not O_CLOEXEC */
679
1023
/* Block SIGCHLD until process is safely in process list */
680
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1024
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1025
&sigchld_action.sa_mask,
682
perror("sigprocmask");
683
exitstatus = EXIT_FAILURE;
1028
error(0, errno, "sigprocmask");
1029
exitstatus = EX_OSERR;
1030
free(direntries[i]);
686
// Starting a new process to be watched
1033
/* Starting a new process to be watched */
1037
} while(pid == -1 and errno == EINTR);
690
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]);
694
1049
/* this is the child process */
695
1050
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1052
error(0, errno, "sigaction");
700
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1055
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
702
perror("sigprocmask");
1057
error(0, errno, "sigprocmask");
706
1061
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1063
error(0, errno, "dup2");
713
/* If dir has no file descriptor, we could not set FD_CLOEXEC
714
above and must now close it manually here. */
717
if(p->environ[0] == NULL){
718
if(execv(filename, p->argv) < 0){
723
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);
732
close(pipefd[1]); /* close unused write end of pipe */
733
process *new_process = malloc(sizeof(process));
734
if (new_process == NULL){
736
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1076
/* Parent process */
1077
close(pipefd[1]); /* Close unused write end of pipe */
1079
plugin *new_plugin = getplugin(direntries[i]->d_name);
1080
if(new_plugin == NULL){
1081
error(0, errno, "getplugin");
1082
ret = (int)(TEMP_FAILURE_RETRY
1083
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
738
perror("sigprocmask");
1086
error(0, errno, "sigprocmask");
740
exitstatus = EXIT_FAILURE;
1088
exitstatus = EX_OSERR;
1089
free(direntries[i]);
744
*new_process = (struct process){ .pid = pid,
746
.next = process_list };
748
process_list = new_process;
1092
free(direntries[i]);
1094
new_plugin->pid = pid;
1095
new_plugin->fd = pipefd[0];
749
1097
/* Unblock SIGCHLD so signal handler can be run if this process
750
1098
has already completed */
751
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1099
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1100
&sigchld_action.sa_mask,
753
perror("sigprocmask");
754
exitstatus = EXIT_FAILURE;
758
FD_SET(new_process->fd, &rfds_all);
760
if (maxfd < new_process->fd){
761
maxfd = new_process->fd;
766
/* Free the plugin list */
767
for(plugin *next; plugin_list != NULL; plugin_list = next){
768
next = plugin_list->next;
769
free(plugin_list->argv);
770
if(plugin_list->environ[0] != NULL){
771
for(char **e = plugin_list->environ; *e != NULL; e++){
781
if (process_list == NULL){
782
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1103
error(0, errno, "sigprocmask");
1104
exitstatus = EX_OSERR;
1108
FD_SET(new_plugin->fd, &rfds_all);
1110
if(maxfd < new_plugin->fd){
1111
maxfd = new_plugin->fd;
1119
free_plugin(getplugin(NULL));
1121
for(plugin *p = plugin_list; p != NULL; p = p->next){
1125
if(p->next == NULL){
1126
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1132
/* Main loop while running plugins exist */
787
1134
fd_set rfds = rfds_all;
788
1135
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
789
if (select_ret == -1){
791
exitstatus = EXIT_FAILURE;
1136
if(select_ret == -1 and errno != EINTR){
1137
error(0, errno, "select");
1138
exitstatus = EX_OSERR;
794
1141
/* OK, now either a process completed, or something can be read
795
1142
from one of them */
796
for(process *proc = process_list; proc ; proc = proc->next){
1143
for(plugin *proc = plugin_list; proc != NULL;){
797
1144
/* Is this process completely done? */
798
if(proc->eof and proc->completed){
1145
if(proc->completed and proc->eof){
799
1146
/* Only accept the plugin output if it exited cleanly */
800
1147
if(not WIFEXITED(proc->status)
801
1148
or WEXITSTATUS(proc->status) != 0){
802
1149
/* Bad exit by plugin */
804
1152
if(WIFEXITED(proc->status)){
805
fprintf(stderr, "Plugin %u exited with status %d\n",
806
(unsigned int) (proc->pid),
1153
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1154
" status %d\n", proc->name,
1155
(intmax_t) (proc->pid),
807
1156
WEXITSTATUS(proc->status));
808
} else if(WIFSIGNALED(proc->status)) {
809
fprintf(stderr, "Plugin %u killed by signal %d\n",
810
(unsigned int) (proc->pid),
811
WTERMSIG(proc->status));
812
} else if(WCOREDUMP(proc->status)){
813
fprintf(stderr, "Plugin %d dumped core\n",
814
(unsigned int) (proc->pid));
1157
} else if(WIFSIGNALED(proc->status)){
1158
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1159
" signal %d: %s\n", proc->name,
1160
(intmax_t) (proc->pid),
1161
WTERMSIG(proc->status),
1162
strsignal(WTERMSIG(proc->status)));
817
1166
/* Remove the plugin */
818
1167
FD_CLR(proc->fd, &rfds_all);
819
1169
/* Block signal while modifying process_list */
820
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1170
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1172
&sigchld_action.sa_mask,
822
perror("sigprocmask");
823
exitstatus = EXIT_FAILURE;
826
/* Delete this process entry from the list */
827
if(process_list == proc){
828
/* First one - simple */
829
process_list = proc->next;
831
/* Second one or later */
832
for(process *p = process_list; p != NULL; p = p->next){
834
p->next = proc->next;
1175
error(0, errno, "sigprocmask");
1176
exitstatus = EX_OSERR;
1180
plugin *next_plugin = proc->next;
839
1184
/* We are done modifying process list, so unblock signal */
840
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
1185
ret = (int)(TEMP_FAILURE_RETRY
1186
(sigprocmask(SIG_UNBLOCK,
1187
&sigchld_action.sa_mask, NULL)));
843
perror("sigprocmask");
847
/* We deleted this process from the list, so we can't go
848
proc->next. Therefore, start over from the beginning of
1189
error(0, errno, "sigprocmask");
1190
exitstatus = EX_OSERR;
1194
if(plugin_list == NULL){
852
1201
/* This process exited nicely, so print its buffer */
854
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1203
bool bret = print_out_password(proc->buffer,
1204
proc->buffer_length);
856
perror("print_out_password");
857
exitstatus = EXIT_FAILURE;
1206
error(0, errno, "print_out_password");
1207
exitstatus = EX_IOERR;
861
1212
/* This process has not completed. Does it have any output? */
862
1213
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
863
1214
/* This process had nothing to say at this time */
866
1218
/* Before reading, make the process' data buffer large enough */
867
1219
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
868
proc->buffer = realloc(proc->buffer, proc->buffer_size
869
+ (size_t) BUFFER_SIZE);
870
if (proc->buffer == NULL){
872
exitstatus = EXIT_FAILURE;
1220
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1221
+ (size_t) BUFFER_SIZE);
1222
if(new_buffer == NULL){
1223
error(0, errno, "malloc");
1224
exitstatus = EX_OSERR;
1227
proc->buffer = new_buffer;
875
1228
proc->buffer_size += BUFFER_SIZE;
877
1230
/* Read from the process */
878
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1231
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1233
+ proc->buffer_length,
881
1236
/* Read error from this process; ignore the error */
886
1242
proc->eof = true;
888
proc->buffer_length += (size_t) ret;
1244
proc->buffer_length += (size_t) sret;
896
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
897
/* Fallback if all plugins failed, none are found or an error occured */
1252
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1253
and exitstatus != EX_OK)){
1254
/* Fallback if all plugins failed, none are found or an error
899
1257
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
900
1258
char *passwordbuffer = getpass("Password: ");
901
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1259
size_t len = strlen(passwordbuffer);
1260
/* Strip trailing newline */
1261
if(len > 0 and passwordbuffer[len-1] == '\n'){
1262
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1265
bret = print_out_password(passwordbuffer, len);
903
perror("print_out_password");
904
exitstatus = EXIT_FAILURE;
1267
error(0, errno, "print_out_password");
1268
exitstatus = EX_IOERR;
909
1272
/* Restore old signal handler */
910
sigaction(SIGCHLD, &old_sigchld_action, NULL);
914
/* Free the plugin list */
915
for(plugin *next; plugin_list != NULL; plugin_list = next){
916
next = plugin_list->next;
917
free(plugin_list->argv);
918
if(plugin_list->environ[0] != NULL){
919
for(char **e = plugin_list->environ; *e != NULL; e++){
1273
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1275
error(0, errno, "sigaction");
1276
exitstatus = EX_OSERR;
1279
if(custom_argv != NULL){
1280
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1292
/* Kill the processes */
1293
for(plugin *p = plugin_list; p != NULL; p = p->next){
1296
ret = kill(p->pid, SIGTERM);
1297
if(ret == -1 and errno != ESRCH){
1298
/* Set-uid proccesses might not get closed */
1299
error(0, errno, "kill");
923
free(plugin_list->environ);
931
/* Free the process list and kill the processes */
932
for(process *next; process_list != NULL; process_list = next){
933
next = process_list->next;
934
close(process_list->fd);
935
ret = kill(process_list->pid, SIGTERM);
936
if(ret == -1 and errno != ESRCH){
937
/* set-uid proccesses migth not get closed */
940
free(process_list->buffer);
944
1304
/* Wait for any remaining child processes to terminate */
946
1306
ret = wait(NULL);
947
1307
} while(ret >= 0);
948
1308
if(errno != ECHILD){
1309
error(0, errno, "wait");
1315
free(pluginhelperdir);
952
1318
return exitstatus;