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/* -*- coding: utf-8 -*- */
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/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
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* 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
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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* 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>.
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#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
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#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
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#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() */
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#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> /* strtok, strlen(), strcpy(),
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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,
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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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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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/* Variables used for running processes*/
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size_t buffer_size;
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size_t buffer_length;
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volatile sig_atomic_t completed;
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typedef struct plugin{
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char *name; /* can be NULL or any plugin name */
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struct plugin *next;
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static plugin *getplugin(char *name, plugin **plugin_list){
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for (plugin *p = *plugin_list; p != NULL; p = p->next){
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or (p->name and name and (strcmp(p->name, name) == 0))){
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static plugin *plugin_list = NULL;
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/* Gets an existing plugin based on name,
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or if none is found, creates a new one */
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__attribute__((warn_unused_result))
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static plugin *getplugin(char *name){
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/* Check for existing plugin with that name */
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for(plugin *p = plugin_list; p != NULL; p = p->next){
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or (p->name and name and (strcmp(p->name, name) == 0))){
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/* Create a new plugin */
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plugin *new_plugin = malloc(sizeof(plugin));
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if (new_plugin == NULL){
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new_plugin->name = name;
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new_plugin->argv = malloc(sizeof(char *) * 2);
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if (new_plugin->argv == NULL){
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new_plugin->argv[0] = name;
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plugin *new_plugin = NULL;
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new_plugin = malloc(sizeof(plugin));
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} while(new_plugin == NULL and errno == EINTR);
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if(new_plugin == NULL){
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char *copy_name = NULL;
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copy_name = strdup(name);
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} while(copy_name == NULL and errno == EINTR);
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if(copy_name == NULL){
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*new_plugin = (plugin){ .name = copy_name,
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.next = plugin_list };
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new_plugin->argv = malloc(sizeof(char *) * 2);
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} while(new_plugin->argv == NULL and errno == EINTR);
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if(new_plugin->argv == NULL){
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new_plugin->argv[0] = copy_name;
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new_plugin->argv[1] = NULL;
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new_plugin->argc = 1;
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new_plugin->disabled = false;
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new_plugin->next = *plugin_list;
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new_plugin->environ = malloc(sizeof(char *));
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} while(new_plugin->environ == NULL and errno == EINTR);
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if(new_plugin->environ == NULL){
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free(new_plugin->argv);
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new_plugin->environ[0] = NULL;
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/* Append the new plugin to the list */
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*plugin_list = new_plugin;
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plugin_list = new_plugin;
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return new_plugin;
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static void addargument(plugin *p, char *arg){
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p->argv[p->argc] = arg;
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p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
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if (p->argv == NULL){
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p->argv[p->argc] = NULL;
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/* Helper function for add_argument and add_environment */
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__attribute__((nonnull, warn_unused_result))
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static bool add_to_char_array(const char *new, char ***array,
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/* Resize the pointed-to array to hold one more pointer */
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char **new_array = NULL;
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new_array = realloc(*array, sizeof(char *)
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* (size_t) ((*len) + 2));
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} while(new_array == NULL and errno == EINTR);
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if(new_array == NULL){
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/* Make a copy of the new string */
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} while(copy == NULL and errno == EINTR);
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/* Insert the copy */
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(*array)[*len] = copy;
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/* Add a new terminating NULL pointer to the last element */
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(*array)[*len] = NULL;
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/* Add to a plugin's argument vector */
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__attribute__((nonnull(2), warn_unused_result))
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static bool add_argument(plugin *p, const char *arg){
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return add_to_char_array(arg, &(p->argv), &(p->argc));
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/* Add to a plugin's environment */
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__attribute__((nonnull(2), warn_unused_result))
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static bool add_environment(plugin *p, const char *def, bool replace){
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/* namelen = length of name of environment variable */
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size_t namelen = (size_t)(strchrnul(def, '=') - def);
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/* Search for this environment variable */
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for(char **envdef = p->environ; *envdef != NULL; envdef++){
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if(strncmp(*envdef, def, namelen + 1) == 0){
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/* It already exists */
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new_envdef = realloc(*envdef, strlen(def) + 1);
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} while(new_envdef == NULL and errno == EINTR);
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if(new_envdef == NULL){
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*envdef = new_envdef;
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strcpy(*envdef, def);
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return add_to_char_array(def, &(p->environ), &(p->envc));
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* Based on the example in the GNU LibC manual chapter 13.13 "File
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* Descriptor Flags".
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* *Note File Descriptor Flags:(libc)Descriptor Flags.
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| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
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static int set_cloexec_flag(int fd)
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int ret = fcntl(fd, F_GETFD, 0);
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__attribute__((warn_unused_result))
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static int set_cloexec_flag(int fd){
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int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
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/* If reading the flags failed, return error indication now. */
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/* Store modified flag word in the descriptor. */
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return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
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return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
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const char *argp_program_version = "plugbasedclient 0.9";
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const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
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process *process_list = NULL;
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/* Mark a process as completed when it exits, and save its exit
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#endif /* not O_CLOEXEC */
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/* Mark processes as completed when they exit, and save their exit
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void handle_sigchld(__attribute__((unused)) int sig){
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process *proc = process_list;
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pid_t pid = wait(&status);
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while(proc != NULL and proc->pid != pid){
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/* Process not found in process list */
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proc->status = status;
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proc->completed = true;
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static void handle_sigchld(__attribute__((unused)) int sig){
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int old_errno = errno;
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plugin *proc = plugin_list;
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pid_t pid = waitpid(-1, &status, WNOHANG);
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/* Only still running child processes */
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/* No child processes */
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error(0, errno, "waitpid");
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/* A child exited, find it in process_list */
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while(proc != NULL and proc->pid != pid){
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/* Process not found in process list */
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proc->status = status;
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/* Prints out a password to stdout */
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__attribute__((nonnull, warn_unused_result))
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static bool print_out_password(const char *buffer, size_t length){
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for(size_t written = 0; written < length; written += (size_t)ret){
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ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
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/* Removes and free a plugin from the plugin list */
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__attribute__((nonnull))
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static void free_plugin(plugin *plugin_node){
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for(char **arg = plugin_node->argv; *arg != NULL; arg++){
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free(plugin_node->argv);
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for(char **env = plugin_node->environ; *env != NULL; env++){
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free(plugin_node->environ);
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free(plugin_node->buffer);
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/* Removes the plugin from the singly-linked list */
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if(plugin_node == plugin_list){
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/* First one - simple */
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plugin_list = plugin_list->next;
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/* Second one or later */
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for(plugin *p = plugin_list; p != NULL; p = p->next){
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if(p->next == plugin_node){
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p->next = plugin_node->next;
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static void free_plugin_list(void){
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while(plugin_list != NULL){
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free_plugin(plugin_list);
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int main(int argc, char *argv[]){
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const char *plugindir = "/conf/conf.d/mandos/plugins.d";
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struct dirent *dirst;
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char *plugindir = NULL;
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char *pluginhelperdir = NULL;
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char *argfile = NULL;
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struct dirent **direntries = NULL;
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int ret, maxfd = 0;
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uid_t uid = 65534;
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gid_t gid = 65534;
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bool debug = false;
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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-env", .key = 'G',
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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 = "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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.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 },
428
{ .name = "usage", .key = -3,
429
.doc = "Give a short usage message", .group = -1 },
430
{ .name = "version", .key = 'V',
431
.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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char *p = strtok(arg, ",");
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addargument(getplugin(NULL, plugins), p);
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p = strtok(NULL, ",");
245
char *name = strtok(arg, ":");
246
char *p = strtok(NULL, ":");
250
addargument(getplugin(name, plugins), p);
251
p = strtok(NULL, ",");
258
getplugin(arg, plugins)->disabled = true;
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uid = (uid_t)strtol(arg, NULL, 10);
268
gid = (gid_t)strtol(arg, NULL, 10);
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 */
483
char *envdef = strchr(arg, ':');
485
argp_error(state, "No colon in \"%s\"", arg);
492
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 */
512
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 %"
534
PRIdMAX, arg, (intmax_t)uid);
540
case 131: /* --groupid */
541
tmp_id = strtoimax(arg, &tmp, 10);
542
if(errno != 0 or tmp == arg or *tmp != '\0'
543
or tmp_id != (gid_t)tmp_id){
544
argp_error(state, "Bad group ID number: \"%s\", using %"
545
PRIdMAX, arg, (intmax_t)gid);
551
case 132: /* --debug */
274
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
282
return ARGP_ERR_UNKNOWN;
287
plugin *plugin_list = NULL;
289
struct argp argp = { .options = options, .parser = parse_opt,
290
.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,
291
632
.doc = "Mandos plugin runner -- Run plugins" };
293
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
294
if (ret == ARGP_ERR_UNKNOWN){
295
perror("argp_parse");
296
exitstatus = EXIT_FAILURE;
301
/* This is a mangled argument in the form of
302
"+--option+--other-option=parameter+--yet-another-option", etc */
303
/* Make new argc and argv vars, and call argp_parse() again. */
304
plus_options++; /* skip the first '+' character */
305
const char delims[] = "+";
308
plus_argv = malloc(sizeof(char*) * 2);
309
if(plus_argv == NULL){
311
exitstatus = EXIT_FAILURE;
314
plus_argv[0] = argv[0];
316
arg = strtok(plus_options, delims); /* Get first argument */
319
plus_argv = realloc(plus_argv, sizeof(char *)
320
* ((unsigned int) new_argc + 1));
321
if(plus_argv == NULL){
323
exitstatus = EXIT_FAILURE;
326
plus_argv[new_argc-1] = arg;
327
plus_argv[new_argc] = NULL;
328
arg = strtok(NULL, delims); /* Get next argument */
330
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
331
if (ret == ARGP_ERR_UNKNOWN){
332
perror("argp_parse");
333
exitstatus = EXIT_FAILURE;
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");
663
char *org_line = NULL;
664
char *p, *arg, *new_arg, *line;
666
const char whitespace_delims[] = " \r\t\f\v\n";
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
682
sret = getline(&org_line, &size, conffp);
688
arg = strsep(&line, comment_delim);
689
while((p = strsep(&arg, whitespace_delims)) != NULL){
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;
729
/* Check for harmful errors and go to fallback. Other errors might
730
not affect opening plugins */
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 */
739
if(custom_argv != NULL){
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);
339
for(plugin *p = plugin_list; p != NULL; p=p->next){
796
for(plugin *p = plugin_list; p != NULL; p = p->next){
340
797
fprintf(stderr, "Plugin: %s has %d arguments\n",
341
798
p->name ? p->name : "Global", p->argc - 1);
342
799
for(char **a = p->argv; *a != NULL; a++){
343
800
fprintf(stderr, "\tArg: %s\n", *a);
802
fprintf(stderr, "...and %d environment variables\n", p->envc);
803
for(char **a = p->environ; *a != NULL; a++){
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");
348
838
ret = setuid(uid);
358
dir = opendir(plugindir);
360
perror("Could not open plugin dir");
361
exitstatus = EXIT_FAILURE;
365
/* Set the FD_CLOEXEC flag on the directory, if possible */
840
error(0, errno, "setuid");
843
/* Open plugin directory with close_on_exec flag */
367
int dir_fd = dirfd(dir);
369
ret = set_cloexec_flag(dir_fd);
371
perror("set_cloexec_flag");
372
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;
378
903
FD_ZERO(&rfds_all);
381
dirst = readdir(dir);
383
// All directory entries have been processed
387
exitstatus = EXIT_FAILURE;
393
d_name_len = strlen(dirst->d_name);
395
// Ignore dotfiles, backup files and other junk
397
bool bad_name = false;
399
const char const *bad_prefixes[] = { ".", "#", NULL };
401
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
403
".dpkg-divert", NULL };
404
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
405
size_t pre_len = strlen(*pre);
406
if((d_name_len >= pre_len)
407
and strncmp((dirst->d_name), *pre, pre_len) == 0){
409
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
410
" with bad prefix %s\n", dirst->d_name, *pre);
421
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
422
size_t suf_len = strlen(*suf);
423
if((d_name_len >= suf_len)
424
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
427
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
428
" with bad suffix %s\n", dirst->d_name, *suf);
440
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
441
if (filename == NULL){
443
exitstatus = EXIT_FAILURE;
446
strcpy(filename, plugindir); /* Spurious warning */
447
strcat(filename, "/"); /* Spurious warning */
448
strcat(filename, dirst->d_name); /* Spurious warning */
450
ret = stat(filename, &st);
453
exitstatus = EXIT_FAILURE;
457
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,
459
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
460
" 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);
465
if(getplugin(dirst->d_name, &plugin_list)->disabled){
937
plugin *p = getplugin(direntries[i]->d_name);
939
error(0, errno, "getplugin");
467
946
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
947
direntries[i]->d_name);
473
plugin *p = getplugin(dirst->d_name, &plugin_list);
475
954
/* Add global arguments to argument list for this plugin */
476
plugin *g = getplugin(NULL, &plugin_list);
477
for(char **a = g->argv + 1; *a != NULL; a++){
485
exitstatus = EXIT_FAILURE;
955
plugin *g = getplugin(NULL);
957
for(char **a = g->argv + 1; *a != NULL; a++){
958
if(not add_argument(p, *a)){
959
error(0, errno, "add_argument");
962
/* Add global environment variables */
963
for(char **e = g->environ; *e != NULL; e++){
964
if(not add_environment(p, *e, false)){
965
error(0, errno, "add_environment");
970
/* If this plugin has any environment variables, we need to
971
duplicate the environment from this process, too. */
972
if(p->environ[0] != NULL){
973
for(char **e = environ; *e != NULL; e++){
974
if(not add_environment(p, *e, false)){
975
error(0, errno, "add_environment");
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 */
488
1003
ret = set_cloexec_flag(pipefd[0]);
490
perror("set_cloexec_flag");
491
exitstatus = EXIT_FAILURE;
1005
error(0, errno, "set_cloexec_flag");
1008
exitstatus = EX_OSERR;
1009
free(direntries[i]);
494
1012
ret = set_cloexec_flag(pipefd[1]);
496
perror("set_cloexec_flag");
497
exitstatus = EXIT_FAILURE;
1014
error(0, errno, "set_cloexec_flag");
1017
exitstatus = EX_OSERR;
1018
free(direntries[i]);
1021
#endif /* not O_CLOEXEC */
500
1022
/* Block SIGCHLD until process is safely in process list */
501
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1023
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1024
&sigchld_action.sa_mask,
503
perror("sigprocmask");
504
exitstatus = EXIT_FAILURE;
507
// Starting a new process to be watched
1027
error(0, errno, "sigprocmask");
1028
exitstatus = EX_OSERR;
1029
free(direntries[i]);
1032
/* Starting a new process to be watched */
1036
} while(pid == -1 and errno == EINTR);
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]);
510
1048
/* this is the child process */
511
1049
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1051
error(0, errno, "sigaction");
516
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1054
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
518
perror("sigprocmask");
1056
error(0, errno, "sigprocmask");
522
1060
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1062
error(0, errno, "dup2");
529
/* If dir has no file descriptor, we could not set FD_CLOEXEC
530
above and must now close it manually here. */
533
if(execv(filename, p->argv) < 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);
541
close(pipefd[1]); /* close unused write end of pipe */
542
process *new_process = malloc(sizeof(process));
543
if (new_process == NULL){
545
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,
547
perror("sigprocmask");
1085
error(0, errno, "sigprocmask");
549
exitstatus = EXIT_FAILURE;
1087
exitstatus = EX_OSERR;
1088
free(direntries[i]);
553
*new_process = (struct process){ .pid = pid,
555
.next = process_list };
557
process_list = new_process;
1091
free(direntries[i]);
1093
new_plugin->pid = pid;
1094
new_plugin->fd = pipefd[0];
558
1096
/* Unblock SIGCHLD so signal handler can be run if this process
559
1097
has already completed */
560
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1098
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1099
&sigchld_action.sa_mask,
562
perror("sigprocmask");
563
exitstatus = EXIT_FAILURE;
567
FD_SET(new_process->fd, &rfds_all);
569
if (maxfd < new_process->fd){
570
maxfd = new_process->fd;
575
/* Free the plugin list */
576
for(plugin *next; plugin_list != NULL; plugin_list = next){
577
next = plugin_list->next;
578
free(plugin_list->argv);
585
if (process_list == NULL){
586
fprintf(stderr, "No plugin processes started, exiting\n");
587
exitstatus = EXIT_FAILURE;
1102
error(0, errno, "sigprocmask");
1103
exitstatus = EX_OSERR;
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 */
591
1133
fd_set rfds = rfds_all;
592
1134
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
593
if (select_ret == -1){
595
exitstatus = EXIT_FAILURE;
1135
if(select_ret == -1 and errno != EINTR){
1136
error(0, errno, "select");
1137
exitstatus = EX_OSERR;
598
1140
/* OK, now either a process completed, or something can be read
599
1141
from one of them */
600
for(process *proc = process_list; proc ; proc = proc->next){
1142
for(plugin *proc = plugin_list; proc != NULL;){
601
1143
/* Is this process completely done? */
602
if(proc->eof and proc->completed){
1144
if(proc->completed and proc->eof){
603
1145
/* Only accept the plugin output if it exited cleanly */
604
1146
if(not WIFEXITED(proc->status)
605
1147
or WEXITSTATUS(proc->status) != 0){
606
1148
/* Bad exit by plugin */
608
1151
if(WIFEXITED(proc->status)){
609
fprintf(stderr, "Plugin %d exited with status %d\n",
610
proc->pid, WEXITSTATUS(proc->status));
611
} else if(WIFSIGNALED(proc->status)) {
612
fprintf(stderr, "Plugin %d killed by signal %d\n",
613
proc->pid, WTERMSIG(proc->status));
614
} else if(WCOREDUMP(proc->status)){
615
fprintf(stderr, "Plugin %d dumped core\n", proc->pid);
1152
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1153
" status %d\n", proc->name,
1154
(intmax_t) (proc->pid),
1155
WEXITSTATUS(proc->status));
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)));
618
1165
/* Remove the plugin */
619
1166
FD_CLR(proc->fd, &rfds_all);
620
1168
/* Block signal while modifying process_list */
621
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1169
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1171
&sigchld_action.sa_mask,
623
perror("sigprocmask");
624
exitstatus = EXIT_FAILURE;
627
/* Delete this process entry from the list */
628
if(process_list == proc){
629
/* First one - simple */
630
process_list = proc->next;
632
/* Second one or later */
633
for(process *p = process_list; p != NULL; p = p->next){
635
p->next = proc->next;
1174
error(0, errno, "sigprocmask");
1175
exitstatus = EX_OSERR;
1179
plugin *next_plugin = proc->next;
640
1183
/* We are done modifying process list, so unblock signal */
641
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
1184
ret = (int)(TEMP_FAILURE_RETRY
1185
(sigprocmask(SIG_UNBLOCK,
1186
&sigchld_action.sa_mask, NULL)));
644
perror("sigprocmask");
648
/* We deleted this process from the list, so we can't go
649
proc->next. Therefore, start over from the beginning of
1188
error(0, errno, "sigprocmask");
1189
exitstatus = EX_OSERR;
1193
if(plugin_list == NULL){
653
1200
/* This process exited nicely, so print its buffer */
654
for(size_t written = 0; written < proc->buffer_length;
655
written += (size_t)ret){
656
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
657
proc->buffer + written,
662
exitstatus = EXIT_FAILURE;
1202
bool bret = print_out_password(proc->buffer,
1203
proc->buffer_length);
1205
error(0, errno, "print_out_password");
1206
exitstatus = EX_IOERR;
668
1211
/* This process has not completed. Does it have any output? */
669
1212
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
670
1213
/* This process had nothing to say at this time */
673
1217
/* Before reading, make the process' data buffer large enough */
674
1218
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
675
proc->buffer = realloc(proc->buffer, proc->buffer_size
676
+ (size_t) BUFFER_SIZE);
677
if (proc->buffer == NULL){
679
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;
682
1227
proc->buffer_size += BUFFER_SIZE;
684
1229
/* Read from the process */
685
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1230
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1232
+ proc->buffer_length,
688
1235
/* Read error from this process; ignore the error */
693
1241
proc->eof = true;
695
proc->buffer_length += (size_t) ret;
1243
proc->buffer_length += (size_t) sret;
699
if(process_list == NULL){
700
fprintf(stderr, "All plugin processes failed, exiting\n");
701
exitstatus = EXIT_FAILURE;
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
1256
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1257
char *passwordbuffer = getpass("Password: ");
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);
1266
error(0, errno, "print_out_password");
1267
exitstatus = EX_IOERR;
705
1271
/* Restore old signal handler */
706
sigaction(SIGCHLD, &old_sigchld_action, NULL);
710
/* Free the plugin list */
711
for(plugin *next; plugin_list != NULL; plugin_list = next){
712
next = plugin_list->next;
713
free(plugin_list->argv);
721
/* Free the process list and kill the processes */
722
for(process *next; process_list != NULL; process_list = next){
723
next = process_list->next;
724
close(process_list->fd);
725
ret = kill(process_list->pid, SIGTERM);
726
if(ret == -1 and errno != ESRCH){
727
/* set-uid proccesses migth not get closed */
730
free(process_list->buffer);
1272
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1274
error(0, errno, "sigaction");
1275
exitstatus = EX_OSERR;
1278
if(custom_argv != NULL){
1279
for(char **arg = custom_argv+1; *arg != NULL; arg++){
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");
734
1303
/* Wait for any remaining child processes to terminate */
736
1305
ret = wait(NULL);
737
1306
} while(ret >= 0);
738
1307
if(errno != ECHILD){
1308
error(0, errno, "wait");
1314
free(pluginhelperdir);
742
1317
return exitstatus;