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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(), getline() */
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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> /* strsep, 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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#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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/* 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 */
224
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));
136
246
* 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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253
/* 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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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
155
void handle_sigchld(__attribute__((unused)) int sig){
156
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 */
281
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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bool print_out_password(const char *buffer, size_t length){
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/* Prints out a password to stdout */
299
__attribute__((nonnull, warn_unused_result))
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static bool print_out_password(const char *buffer, size_t length){
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if(length>0 and buffer[length-1] == '\n'){
179
302
for(size_t written = 0; written < length; written += (size_t)ret){
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ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
181
304
length - written));
246
387
{ .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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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" },
396
{ .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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.arg = "DIRECTORY",
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407
.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 },
261
{ .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 },
264
{ .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 },
419
{ .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 = '?',
427
.doc = "Give this help list", .group = -1 },
428
{ .name = "usage", .key = -3,
429
.doc = "Give a short usage message", .group = -1 },
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{ .name = "version", .key = 'V',
431
.doc = "Print program version", .group = -1 },
269
error_t parse_opt (int key, char *arg, struct argp_state *state) {
270
/* Get the INPUT argument from `argp_parse', which we know is a
271
pointer to our plugin list pointer. */
272
plugin **plugins = state->input;
277
while((p = strsep(&arg, ",")) != NULL){
281
addargument(getplugin(NULL, plugins), p);
287
char *name = strsep(&arg, ":");
291
char *opt = strsep(&arg, ":");
297
while((p = strsep(&opt, ",")) != NULL){
301
addargument(getplugin(name, plugins), p);
308
getplugin(arg, plugins)->disabled = true;
315
uid = (uid_t)strtol(arg, NULL, 10);
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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 */
324
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
329
return ARGP_ERR_UNKNOWN;
334
plugin *plugin_list = NULL;
336
struct argp argp = { .options = options, .parser = parse_opt,
337
.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
__builtin_unreachable();
568
case -3: /* --usage */
569
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
570
argp_state_help(state, state->out_stream,
571
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
572
__builtin_unreachable();
573
case 'V': /* --version */
574
fprintf(state->out_stream, "%s\n", argp_program_version);
578
* When adding more options before this line, remember to also add a
579
* "case" to the "parse_opt_config_file" function below.
582
/* Cryptsetup always passes an argument, which is an empty
583
string if "none" was specified in /etc/crypttab. So if
584
argument was empty, we ignore it silently. */
590
return ARGP_ERR_UNKNOWN;
592
return errno; /* Set to 0 at start */
595
/* This option parser is the same as parse_opt() above, except it
596
ignores everything but the --config-file option. */
597
error_t parse_opt_config_file(int key, char *arg,
598
__attribute__((unused))
599
struct argp_state *state){
602
case 'g': /* --global-options */
603
case 'G': /* --global-env */
604
case 'o': /* --options-for */
605
case 'E': /* --env-for */
606
case 'd': /* --disable */
607
case 'e': /* --enable */
608
case 128: /* --plugin-dir */
610
case 129: /* --config-file */
612
argfile = strdup(arg);
617
case 130: /* --userid */
618
case 131: /* --groupid */
619
case 132: /* --debug */
620
case 133: /* --plugin-helper-dir */
621
case '?': /* --help */
622
case -3: /* --usage */
623
case 'V': /* --version */
627
return ARGP_ERR_UNKNOWN;
632
struct argp argp = { .options = options,
633
.parser = parse_opt_config_file,
338
635
.doc = "Mandos plugin runner -- Run plugins" };
340
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
341
if (ret == ARGP_ERR_UNKNOWN){
342
fprintf(stderr, "Unknown error while parsing arguments\n");
343
exitstatus = EXIT_FAILURE;
347
conffp = fopen(argfile, "r");
637
/* Parse using parse_opt_config_file() in order to get the custom
638
config file location, if any. */
639
ret = argp_parse(&argp, argc, argv,
640
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
648
error(0, errno, "argp_parse");
649
exitstatus = EX_OSERR;
652
exitstatus = EX_USAGE;
656
/* Reset to the normal argument parser */
657
argp.parser = parse_opt;
659
/* Open the configfile if available */
661
conffp = fopen(AFILE, "r");
663
conffp = fopen(argfile, "r");
348
665
if(conffp != NULL){
349
666
char *org_line = NULL;
667
char *p, *arg, *new_arg, *line;
352
char *p, *arg, *new_arg, *line;
353
669
const char whitespace_delims[] = " \r\t\f\v\n";
354
670
const char comment_delim[] = "#";
673
custom_argv = malloc(sizeof(char*) * 2);
674
if(custom_argv == NULL){
675
error(0, errno, "malloc");
676
exitstatus = EX_OSERR;
679
custom_argv[0] = argv[0];
680
custom_argv[1] = NULL;
682
/* for each line in the config file, strip whitespace and ignore
357
685
sret = getline(&org_line, &size, conffp);
363
691
arg = strsep(&line, comment_delim);
364
692
while((p = strsep(&arg, whitespace_delims)) != NULL){
368
696
new_arg = strdup(p);
369
custom_argv = addcustomargument(custom_argv, &custom_argc, new_arg);
370
if (custom_argv == NULL){
371
perror("addcustomargument");
372
exitstatus = EXIT_FAILURE;
698
error(0, errno, "strdup");
699
exitstatus = EX_OSERR;
706
char **new_argv = realloc(custom_argv, sizeof(char *)
707
* ((size_t)custom_argc + 1));
708
if(new_argv == NULL){
709
error(0, errno, "realloc");
710
exitstatus = EX_OSERR;
715
custom_argv = new_argv;
718
custom_argv[custom_argc-1] = new_arg;
719
custom_argv[custom_argc] = NULL;
723
ret = fclose(conffp);
724
} while(ret == EOF and errno == EINTR);
726
error(0, errno, "fclose");
727
exitstatus = EX_IOERR;
379
732
/* Check for harmful errors and go to fallback. Other errors might
380
733
not affect opening plugins */
381
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
383
exitstatus = EXIT_FAILURE;
734
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
735
error(0, errno, "fopen");
736
exitstatus = EX_OSERR;
740
/* If there were any arguments from the configuration file, pass
741
them to parser as command line arguments */
388
742
if(custom_argv != NULL){
389
custom_argv[0] = argv[0];
390
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
391
if (ret == ARGP_ERR_UNKNOWN){
392
fprintf(stderr, "Unknown error while parsing arguments\n");
393
exitstatus = EXIT_FAILURE;
743
ret = argp_parse(&argp, custom_argc, custom_argv,
744
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
752
error(0, errno, "argp_parse");
753
exitstatus = EX_OSERR;
756
exitstatus = EX_CONFIG;
761
/* Parse actual command line arguments, to let them override the
763
ret = argp_parse(&argp, argc, argv,
764
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
772
error(0, errno, "argp_parse");
773
exitstatus = EX_OSERR;
776
exitstatus = EX_USAGE;
781
char *pluginhelperenv;
783
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
784
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
786
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
788
if(ret == -1 or not bret){
789
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
790
" environment variable to \"%s\" for all plugins\n",
791
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
794
free(pluginhelperenv);
399
for(plugin *p = plugin_list; p != NULL; p=p->next){
799
for(plugin *p = plugin_list; p != NULL; p = p->next){
400
800
fprintf(stderr, "Plugin: %s has %d arguments\n",
401
801
p->name ? p->name : "Global", p->argc - 1);
402
802
for(char **a = p->argv; *a != NULL; a++){
403
803
fprintf(stderr, "\tArg: %s\n", *a);
805
fprintf(stderr, "...and %d environment variables\n", p->envc);
806
for(char **a = p->environ; *a != NULL; a++){
807
fprintf(stderr, "\t%s\n", *a);
813
/* Work around Debian bug #633582:
814
<https://bugs.debian.org/633582> */
815
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
816
if(plugindir_fd == -1){
818
error(0, errno, "open(\"" PDIR "\")");
821
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
823
error(0, errno, "fstat");
825
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
826
ret = fchown(plugindir_fd, uid, gid);
828
error(0, errno, "fchown");
836
/* Lower permissions */
839
error(0, errno, "setgid");
408
841
ret = setuid(uid);
418
dir = opendir(plugindir);
420
perror("Could not open plugin dir");
421
exitstatus = EXIT_FAILURE;
425
/* Set the FD_CLOEXEC flag on the directory, if possible */
843
error(0, errno, "setuid");
846
/* Open plugin directory with close_on_exec flag */
427
int dir_fd = dirfd(dir);
429
ret = set_cloexec_flag(dir_fd);
431
perror("set_cloexec_flag");
432
exitstatus = EXIT_FAILURE;
848
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
851
#else /* not O_CLOEXEC */
853
#endif /* not O_CLOEXEC */
856
error(0, errno, "Could not open plugin dir");
857
exitstatus = EX_UNAVAILABLE;
862
/* Set the FD_CLOEXEC flag on the directory */
863
ret = set_cloexec_flag(dir_fd);
865
error(0, errno, "set_cloexec_flag");
866
exitstatus = EX_OSERR;
869
#endif /* O_CLOEXEC */
872
int good_name(const struct dirent * const dirent){
873
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
874
"*.dpkg-old", "*.dpkg-bak",
875
"*.dpkg-divert", NULL };
877
#pragma GCC diagnostic push
878
#pragma GCC diagnostic ignored "-Wcast-qual"
880
for(const char **pat = (const char **)patterns;
881
*pat != NULL; pat++){
883
#pragma GCC diagnostic pop
885
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
888
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
889
" matching pattern %s\n", dirent->d_name, *pat);
897
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
899
if(numplugins == -1){
900
error(0, errno, "Could not scan plugin dir");
902
exitstatus = EX_OSERR;
438
906
FD_ZERO(&rfds_all);
441
dirst = readdir(dir);
443
// All directory entries have been processed
447
exitstatus = EXIT_FAILURE;
453
d_name_len = strlen(dirst->d_name);
455
// Ignore dotfiles, backup files and other junk
457
bool bad_name = false;
459
const char const *bad_prefixes[] = { ".", "#", NULL };
461
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
463
".dpkg-divert", NULL };
464
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
465
size_t pre_len = strlen(*pre);
466
if((d_name_len >= pre_len)
467
and strncmp((dirst->d_name), *pre, pre_len) == 0){
469
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
470
" with bad prefix %s\n", dirst->d_name, *pre);
481
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
482
size_t suf_len = strlen(*suf);
483
if((d_name_len >= suf_len)
484
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
487
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
488
" with bad suffix %s\n", dirst->d_name, *suf);
500
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
501
if (filename == NULL){
505
strcpy(filename, plugindir); /* Spurious warning */
506
strcat(filename, "/"); /* Spurious warning */
507
strcat(filename, dirst->d_name); /* Spurious warning */
509
ret = stat(filename, &st);
516
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
908
/* Read and execute any executable in the plugin directory*/
909
for(int i = 0; i < numplugins; i++){
911
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
913
error(0, errno, "Could not open plugin");
917
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
919
error(0, errno, "stat");
925
/* Ignore non-executable files */
926
if(not S_ISREG(st.st_mode)
927
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
518
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
519
" with bad type or mode\n", filename);
930
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
931
" with bad type or mode\n",
932
plugindir != NULL ? plugindir : PDIR,
933
direntries[i]->d_name);
524
if(getplugin(dirst->d_name, &plugin_list)->disabled){
940
plugin *p = getplugin(direntries[i]->d_name);
942
error(0, errno, "getplugin");
526
949
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
950
direntries[i]->d_name);
532
plugin *p = getplugin(dirst->d_name, &plugin_list);
534
957
/* Add global arguments to argument list for this plugin */
535
plugin *g = getplugin(NULL, &plugin_list);
536
for(char **a = g->argv + 1; *a != NULL; a++){
544
exitstatus = EXIT_FAILURE;
958
plugin *g = getplugin(NULL);
960
for(char **a = g->argv + 1; *a != NULL; a++){
961
if(not add_argument(p, *a)){
962
error(0, errno, "add_argument");
965
/* Add global environment variables */
966
for(char **e = g->environ; *e != NULL; e++){
967
if(not add_environment(p, *e, false)){
968
error(0, errno, "add_environment");
973
/* If this plugin has any environment variables, we need to
974
duplicate the environment from this process, too. */
975
if(p->environ[0] != NULL){
976
for(char **e = environ; *e != NULL; e++){
977
if(not add_environment(p, *e, false)){
978
error(0, errno, "add_environment");
985
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
986
#else /* O_CLOEXEC */
987
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
988
#endif /* O_CLOEXEC */
990
error(0, errno, "pipe");
991
exitstatus = EX_OSERR;
995
if(pipefd[0] >= FD_SETSIZE){
996
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1000
exitstatus = EX_OSERR;
1001
free(direntries[i]);
1005
/* Ask OS to automatic close the pipe on exec */
547
1006
ret = set_cloexec_flag(pipefd[0]);
549
perror("set_cloexec_flag");
550
exitstatus = EXIT_FAILURE;
1008
error(0, errno, "set_cloexec_flag");
1011
exitstatus = EX_OSERR;
1012
free(direntries[i]);
553
1015
ret = set_cloexec_flag(pipefd[1]);
555
perror("set_cloexec_flag");
556
exitstatus = EXIT_FAILURE;
1017
error(0, errno, "set_cloexec_flag");
1020
exitstatus = EX_OSERR;
1021
free(direntries[i]);
1024
#endif /* not O_CLOEXEC */
559
1025
/* Block SIGCHLD until process is safely in process list */
560
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1026
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1027
&sigchld_action.sa_mask,
562
perror("sigprocmask");
563
exitstatus = EXIT_FAILURE;
1030
error(0, errno, "sigprocmask");
1031
exitstatus = EX_OSERR;
1032
free(direntries[i]);
566
// Starting a new process to be watched
1035
/* Starting a new process to be watched */
1039
} while(pid == -1 and errno == EINTR);
570
exitstatus = EXIT_FAILURE;
1041
error(0, errno, "fork");
1042
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1043
&sigchld_action.sa_mask, NULL));
1046
exitstatus = EX_OSERR;
1047
free(direntries[i]);
574
1051
/* this is the child process */
575
1052
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1054
error(0, errno, "sigaction");
580
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1057
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
582
perror("sigprocmask");
1059
error(0, errno, "sigprocmask");
586
1063
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1065
error(0, errno, "dup2");
593
/* If dir has no file descriptor, we could not set FD_CLOEXEC
594
above and must now close it manually here. */
597
if(execv(filename, p->argv) < 0){
1069
if(fexecve(plugin_fd, p->argv,
1070
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1071
error(0, errno, "fexecve for %s/%s",
1072
plugindir != NULL ? plugindir : PDIR,
1073
direntries[i]->d_name);
605
close(pipefd[1]); /* close unused write end of pipe */
606
process *new_process = malloc(sizeof(process));
607
if (new_process == NULL){
609
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1078
/* Parent process */
1079
close(pipefd[1]); /* Close unused write end of pipe */
1081
plugin *new_plugin = getplugin(direntries[i]->d_name);
1082
if(new_plugin == NULL){
1083
error(0, errno, "getplugin");
1084
ret = (int)(TEMP_FAILURE_RETRY
1085
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
611
perror("sigprocmask");
1088
error(0, errno, "sigprocmask");
613
exitstatus = EXIT_FAILURE;
1090
exitstatus = EX_OSERR;
1091
free(direntries[i]);
1094
free(direntries[i]);
617
*new_process = (struct process){ .pid = pid,
619
.next = process_list };
621
process_list = new_process;
1096
new_plugin->pid = pid;
1097
new_plugin->fd = pipefd[0];
1100
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1101
new_plugin->name, (intmax_t) (new_plugin->pid));
622
1104
/* Unblock SIGCHLD so signal handler can be run if this process
623
1105
has already completed */
624
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1106
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1107
&sigchld_action.sa_mask,
626
perror("sigprocmask");
627
exitstatus = EXIT_FAILURE;
631
FD_SET(new_process->fd, &rfds_all);
633
if (maxfd < new_process->fd){
634
maxfd = new_process->fd;
639
/* Free the plugin list */
640
for(plugin *next; plugin_list != NULL; plugin_list = next){
641
next = plugin_list->next;
642
free(plugin_list->argv);
649
if (process_list == NULL){
650
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1110
error(0, errno, "sigprocmask");
1111
exitstatus = EX_OSERR;
1115
FD_SET(new_plugin->fd, &rfds_all);
1117
if(maxfd < new_plugin->fd){
1118
maxfd = new_plugin->fd;
1126
free_plugin(getplugin(NULL));
1128
for(plugin *p = plugin_list; p != NULL; p = p->next){
1132
if(p->next == NULL){
1133
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1139
/* Main loop while running plugins exist */
655
1141
fd_set rfds = rfds_all;
656
1142
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
657
if (select_ret == -1){
659
exitstatus = EXIT_FAILURE;
1143
if(select_ret == -1 and errno != EINTR){
1144
error(0, errno, "select");
1145
exitstatus = EX_OSERR;
662
1148
/* OK, now either a process completed, or something can be read
663
1149
from one of them */
664
for(process *proc = process_list; proc ; proc = proc->next){
1150
for(plugin *proc = plugin_list; proc != NULL;){
665
1151
/* Is this process completely done? */
666
if(proc->eof and proc->completed){
1152
if(proc->completed and proc->eof){
667
1153
/* Only accept the plugin output if it exited cleanly */
668
1154
if(not WIFEXITED(proc->status)
669
1155
or WEXITSTATUS(proc->status) != 0){
670
1156
/* Bad exit by plugin */
672
1159
if(WIFEXITED(proc->status)){
673
fprintf(stderr, "Plugin %u exited with status %d\n",
674
(unsigned int) (proc->pid),
1160
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1161
" status %d\n", proc->name,
1162
(intmax_t) (proc->pid),
675
1163
WEXITSTATUS(proc->status));
676
} else if(WIFSIGNALED(proc->status)) {
677
fprintf(stderr, "Plugin %u killed by signal %d\n",
678
(unsigned int) (proc->pid),
679
WTERMSIG(proc->status));
680
} else if(WCOREDUMP(proc->status)){
681
fprintf(stderr, "Plugin %d dumped core\n",
682
(unsigned int) (proc->pid));
1164
} else if(WIFSIGNALED(proc->status)){
1165
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1166
" signal %d: %s\n", proc->name,
1167
(intmax_t) (proc->pid),
1168
WTERMSIG(proc->status),
1169
strsignal(WTERMSIG(proc->status)));
685
1173
/* Remove the plugin */
686
1174
FD_CLR(proc->fd, &rfds_all);
687
1176
/* Block signal while modifying process_list */
688
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1177
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1179
&sigchld_action.sa_mask,
690
perror("sigprocmask");
691
exitstatus = EXIT_FAILURE;
694
/* Delete this process entry from the list */
695
if(process_list == proc){
696
/* First one - simple */
697
process_list = proc->next;
699
/* Second one or later */
700
for(process *p = process_list; p != NULL; p = p->next){
702
p->next = proc->next;
1182
error(0, errno, "sigprocmask");
1183
exitstatus = EX_OSERR;
1187
plugin *next_plugin = proc->next;
707
1191
/* We are done modifying process list, so unblock signal */
708
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
1192
ret = (int)(TEMP_FAILURE_RETRY
1193
(sigprocmask(SIG_UNBLOCK,
1194
&sigchld_action.sa_mask, NULL)));
711
perror("sigprocmask");
715
/* We deleted this process from the list, so we can't go
716
proc->next. Therefore, start over from the beginning of
1196
error(0, errno, "sigprocmask");
1197
exitstatus = EX_OSERR;
1201
if(plugin_list == NULL){
720
1208
/* This process exited nicely, so print its buffer */
722
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1210
bool bret = print_out_password(proc->buffer,
1211
proc->buffer_length);
724
perror("print_out_password");
725
exitstatus = EXIT_FAILURE;
1213
error(0, errno, "print_out_password");
1214
exitstatus = EX_IOERR;
729
1219
/* This process has not completed. Does it have any output? */
730
1220
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
731
1221
/* This process had nothing to say at this time */
734
1225
/* Before reading, make the process' data buffer large enough */
735
1226
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
736
proc->buffer = realloc(proc->buffer, proc->buffer_size
737
+ (size_t) BUFFER_SIZE);
738
if (proc->buffer == NULL){
740
exitstatus = EXIT_FAILURE;
1227
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1228
+ (size_t) BUFFER_SIZE);
1229
if(new_buffer == NULL){
1230
error(0, errno, "malloc");
1231
exitstatus = EX_OSERR;
1234
proc->buffer = new_buffer;
743
1235
proc->buffer_size += BUFFER_SIZE;
745
1237
/* Read from the process */
746
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1238
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1240
+ proc->buffer_length,
749
1243
/* Read error from this process; ignore the error */
754
1249
proc->eof = true;
756
proc->buffer_length += (size_t) ret;
1251
proc->buffer_length += (size_t) sret;
764
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
765
/* Fallback if all plugins failed, none are found or an error occured */
1259
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1260
and exitstatus != EX_OK)){
1261
/* Fallback if all plugins failed, none are found or an error
767
1264
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
768
1265
char *passwordbuffer = getpass("Password: ");
769
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1266
size_t len = strlen(passwordbuffer);
1267
/* Strip trailing newline */
1268
if(len > 0 and passwordbuffer[len-1] == '\n'){
1269
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1272
bret = print_out_password(passwordbuffer, len);
771
perror("print_out_password");
772
exitstatus = EXIT_FAILURE;
1274
error(0, errno, "print_out_password");
1275
exitstatus = EX_IOERR;
777
1279
/* Restore old signal handler */
778
sigaction(SIGCHLD, &old_sigchld_action, NULL);
782
/* Free the plugin list */
783
for(plugin *next; plugin_list != NULL; plugin_list = next){
784
next = plugin_list->next;
785
free(plugin_list->argv);
793
/* Free the process list and kill the processes */
794
for(process *next; process_list != NULL; process_list = next){
795
next = process_list->next;
796
close(process_list->fd);
797
ret = kill(process_list->pid, SIGTERM);
798
if(ret == -1 and errno != ESRCH){
799
/* set-uid proccesses migth not get closed */
802
free(process_list->buffer);
1280
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1282
error(0, errno, "sigaction");
1283
exitstatus = EX_OSERR;
1286
if(custom_argv != NULL){
1287
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1299
/* Kill the processes */
1300
for(plugin *p = plugin_list; p != NULL; p = p->next){
1303
ret = kill(p->pid, SIGTERM);
1304
if(ret == -1 and errno != ESRCH){
1305
/* Set-uid proccesses might not get closed */
1306
error(0, errno, "kill");
806
1311
/* Wait for any remaining child processes to terminate */
808
1313
ret = wait(NULL);
809
1314
} while(ret >= 0);
810
1315
if(errno != ECHILD){
1316
error(0, errno, "wait");
1322
free(pluginhelperdir);
814
1325
return exitstatus;