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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 © 2008-2017 Teddy Hogeborn
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* Copyright © 2008-2017 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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17
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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18
* General Public License for more details.
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* 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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#include <stdio.h> /* popen, fileno */
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#include <iso646.h> /* and, or, not */
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#include <sys/types.h> /* DIR, opendir, stat, struct stat, waitpid,
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WIFEXITED, WEXITSTATUS, wait */
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#include <sys/wait.h> /* wait */
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#include <dirent.h> /* DIR, opendir */
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#include <sys/stat.h> /* stat, struct stat */
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#include <unistd.h> /* stat, struct stat, chdir */
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#include <stdlib.h> /* EXIT_FAILURE */
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#include <sys/select.h> /* fd_set, select, FD_ZERO, FD_SET,
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#include <string.h> /* strlen, strcpy, strcat */
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#include <stdbool.h> /* true */
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#include <sys/wait.h> /* waitpid, WIFEXITED, WEXITSTATUS */
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#include <errno.h> /* errno */
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#include <argp.h> /* argp */
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typedef struct process{
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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_SUCCESS,
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#include <stdbool.h> /* bool, true, false */
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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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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> /* 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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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,
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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(), 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 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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typedef struct plugin{
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char *name; /* can be "global" and any plugin name */
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volatile sig_atomic_t completed;
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struct plugin *next;
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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->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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new_plugin->next = *plugin_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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void addarguments(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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p->argv[p->argc] = NULL;
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#define BUFFER_SIZE 256
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const char *argp_program_version =
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"plugbasedclient 0.9";
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const char *argp_program_bug_address =
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"<mandos@fukt.bsnet.se>";
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"Mandos plugin runner -- Run Mandos plugins";
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/* A description of the arguments we accept. */
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static char args_doc[] = "";
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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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| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
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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. */
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
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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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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");
284
/* 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,
312
/* 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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free(plugin_node->name);
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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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char plugindir[] = "plugins.d";
111
size_t d_name_len, plugindir_len = sizeof(plugindir)-1;
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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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process *process_list = NULL;
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int exitstatus = EXIT_SUCCESS;
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struct sigaction old_sigchld_action;
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struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
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.sa_flags = SA_NOCLDSTOP };
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char **custom_argv = NULL;
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/* Establish a signal handler */
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sigemptyset(&sigchld_action.sa_mask);
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ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
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error(0, errno, "sigaddset");
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exitstatus = EX_OSERR;
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ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
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error(0, errno, "sigaction");
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exitstatus = EX_OSERR;
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/* The options we understand. */
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387
struct argp_option options[] = {
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{ .name = "global-options", .key = 'g',
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.arg = "option[,option[,...]]", .flags = 0,
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.doc = "Options effecting all plugins" },
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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[,...]]", .flags = 0,
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.doc = "Options effecting only specified plugins" },
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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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.doc = "Specify a different plugin directory", .group = 2 },
409
{ .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
427
{ .name = "help", .key = '?',
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.doc = "Give this help list", .group = -1 },
429
{ .name = "usage", .key = -3,
430
.doc = "Give a short usage message", .group = -1 },
431
{ .name = "version", .key = 'V',
432
.doc = "Print program version", .group = -1 },
130
error_t parse_opt (int key, char *arg, struct argp_state *state) {
131
/* Get the INPUT argument from `argp_parse', which we
132
know is a pointer to our arguments structure. */
133
plugin **plugins = state->input;
137
char *p = strtok(arg, ",");
139
addarguments(getplugin(NULL, plugins), p);
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p = strtok(NULL, ",");
146
char *name = strtok(arg, ":");
147
char *p = strtok(NULL, ":");
150
addarguments(getplugin(name, plugins), p);
151
p = strtok(NULL, ",");
161
return ARGP_ERR_UNKNOWN;
166
plugin *plugin_list = NULL;
168
struct argp argp = { .options = options, .parser = parse_opt,
169
.args_doc = args_doc, .doc = doc };
171
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
173
/* for(plugin *p = plugin_list; p != NULL; p=p->next){ */
174
/* fprintf(stderr, "Plugin: %s has %d arguments\n", p->name ? p->name : "Global", p->argc); */
175
/* for(char **a = p->argv + 1; *a != NULL; a++){ */
176
/* fprintf(stderr, "\tArg: %s\n", *a); */
182
dir = opendir(plugindir);
185
fprintf(stderr, "Can not open directory\n");
192
dirst = readdir(dir);
194
// All directory entries have been processed
199
d_name_len = strlen(dirst->d_name);
201
// Ignore dotfiles and backup files
202
if (dirst->d_name[0] == '.'
203
or dirst->d_name[d_name_len - 1] == '~'){
207
char *filename = malloc(d_name_len + plugindir_len + 2);
208
strcpy(filename, plugindir);
209
strcat(filename, "/");
210
strcat(filename, dirst->d_name);
214
if (S_ISREG(st.st_mode) and (access(filename, X_OK) == 0)){
215
// Starting a new process to be watched
216
process *new_process = malloc(sizeof(process));
223
new_process->pid = fork();
224
if(new_process->pid == 0){
225
/* this is the child process */
227
close(pipefd[0]); /* close unused read end of pipe */
228
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
230
basename = strrchr(filename, '/');
231
if (basename == NULL){
236
plugin *p = getplugin(basename, &plugin_list);
238
plugin *g = getplugin(NULL, &plugin_list);
436
__attribute__((nonnull(3)))
437
error_t parse_opt(int key, char *arg, struct argp_state *state){
442
case 'g': /* --global-options */
445
while((plugin_option = strsep(&arg, ",")) != NULL){
446
if(not add_argument(getplugin(NULL), plugin_option)){
453
case 'G': /* --global-env */
454
if(add_environment(getplugin(NULL), arg, true)){
458
case 'o': /* --options-for */
460
char *option_list = strchr(arg, ':');
461
if(option_list == NULL){
462
argp_error(state, "No colon in \"%s\"", arg);
469
argp_error(state, "Empty plugin name");
474
while((option = strsep(&option_list, ",")) != NULL){
475
if(not add_argument(getplugin(arg), option)){
482
case 'E': /* --env-for */
484
char *envdef = strchr(arg, ':');
486
argp_error(state, "No colon in \"%s\"", arg);
493
argp_error(state, "Empty plugin name");
497
if(add_environment(getplugin(arg), envdef, true)){
502
case 'd': /* --disable */
504
plugin *p = getplugin(arg);
511
case 'e': /* --enable */
513
plugin *p = getplugin(arg);
520
case 128: /* --plugin-dir */
522
plugindir = strdup(arg);
523
if(plugindir != NULL){
527
case 129: /* --config-file */
528
/* This is already done by parse_opt_config_file() */
530
case 130: /* --userid */
531
tmp_id = strtoimax(arg, &tmp, 10);
532
if(errno != 0 or tmp == arg or *tmp != '\0'
533
or tmp_id != (uid_t)tmp_id){
534
argp_error(state, "Bad user ID number: \"%s\", using %"
535
PRIdMAX, arg, (intmax_t)uid);
541
case 131: /* --groupid */
542
tmp_id = strtoimax(arg, &tmp, 10);
543
if(errno != 0 or tmp == arg or *tmp != '\0'
544
or tmp_id != (gid_t)tmp_id){
545
argp_error(state, "Bad group ID number: \"%s\", using %"
546
PRIdMAX, arg, (intmax_t)gid);
552
case 132: /* --debug */
555
case 133: /* --plugin-helper-dir */
556
free(pluginhelperdir);
557
pluginhelperdir = strdup(arg);
558
if(pluginhelperdir != NULL){
563
* These reproduce what we would get without ARGP_NO_HELP
565
case '?': /* --help */
566
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
567
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
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
case 'V': /* --version */
573
fprintf(state->out_stream, "%s\n", argp_program_version);
577
* When adding more options before this line, remember to also add a
578
* "case" to the "parse_opt_config_file" function below.
581
/* Cryptsetup always passes an argument, which is an empty
582
string if "none" was specified in /etc/crypttab. So if
583
argument was empty, we ignore it silently. */
588
return ARGP_ERR_UNKNOWN;
590
return errno; /* Set to 0 at start */
593
/* This option parser is the same as parse_opt() above, except it
594
ignores everything but the --config-file option. */
595
error_t parse_opt_config_file(int key, char *arg,
596
__attribute__((unused))
597
struct argp_state *state){
600
case 'g': /* --global-options */
601
case 'G': /* --global-env */
602
case 'o': /* --options-for */
603
case 'E': /* --env-for */
604
case 'd': /* --disable */
605
case 'e': /* --enable */
606
case 128: /* --plugin-dir */
608
case 129: /* --config-file */
610
argfile = strdup(arg);
615
case 130: /* --userid */
616
case 131: /* --groupid */
617
case 132: /* --debug */
618
case 133: /* --plugin-helper-dir */
619
case '?': /* --help */
620
case -3: /* --usage */
621
case 'V': /* --version */
625
return ARGP_ERR_UNKNOWN;
630
struct argp argp = { .options = options,
631
.parser = parse_opt_config_file,
633
.doc = "Mandos plugin runner -- Run plugins" };
635
/* Parse using parse_opt_config_file() in order to get the custom
636
config file location, if any. */
637
ret = argp_parse(&argp, argc, argv,
638
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
646
error(0, errno, "argp_parse");
647
exitstatus = EX_OSERR;
650
exitstatus = EX_USAGE;
654
/* Reset to the normal argument parser */
655
argp.parser = parse_opt;
657
/* Open the configfile if available */
659
conffp = fopen(AFILE, "r");
661
conffp = fopen(argfile, "r");
664
char *org_line = NULL;
665
char *p, *arg, *new_arg, *line;
667
const char whitespace_delims[] = " \r\t\f\v\n";
668
const char comment_delim[] = "#";
671
custom_argv = malloc(sizeof(char*) * 2);
672
if(custom_argv == NULL){
673
error(0, errno, "malloc");
674
exitstatus = EX_OSERR;
677
custom_argv[0] = argv[0];
678
custom_argv[1] = NULL;
680
/* for each line in the config file, strip whitespace and ignore
683
sret = getline(&org_line, &size, conffp);
689
arg = strsep(&line, comment_delim);
690
while((p = strsep(&arg, whitespace_delims)) != NULL){
696
error(0, errno, "strdup");
697
exitstatus = EX_OSERR;
704
char **new_argv = realloc(custom_argv, sizeof(char *)
705
* ((size_t)custom_argc + 1));
706
if(new_argv == NULL){
707
error(0, errno, "realloc");
708
exitstatus = EX_OSERR;
713
custom_argv = new_argv;
716
custom_argv[custom_argc-1] = new_arg;
717
custom_argv[custom_argc] = NULL;
721
ret = fclose(conffp);
722
} while(ret == EOF and errno == EINTR);
724
error(0, errno, "fclose");
725
exitstatus = EX_IOERR;
730
/* Check for harmful errors and go to fallback. Other errors might
731
not affect opening plugins */
732
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
733
error(0, errno, "fopen");
734
exitstatus = EX_OSERR;
738
/* If there were any arguments from the configuration file, pass
739
them to parser as command line arguments */
740
if(custom_argv != NULL){
741
ret = argp_parse(&argp, custom_argc, custom_argv,
742
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
750
error(0, errno, "argp_parse");
751
exitstatus = EX_OSERR;
754
exitstatus = EX_CONFIG;
759
/* Parse actual command line arguments, to let them override the
761
ret = argp_parse(&argp, argc, argv,
762
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
770
error(0, errno, "argp_parse");
771
exitstatus = EX_OSERR;
774
exitstatus = EX_USAGE;
779
char *pluginhelperenv;
781
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
782
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
784
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
786
if(ret == -1 or not bret){
787
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
788
" environment variable to \"%s\" for all plugins\n",
789
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
792
free(pluginhelperenv);
797
for(plugin *p = plugin_list; p != NULL; p = p->next){
798
fprintf(stderr, "Plugin: %s has %d arguments\n",
799
p->name ? p->name : "Global", p->argc - 1);
800
for(char **a = p->argv; *a != NULL; a++){
801
fprintf(stderr, "\tArg: %s\n", *a);
803
fprintf(stderr, "...and %d environment variables\n", p->envc);
804
for(char **a = p->environ; *a != NULL; a++){
805
fprintf(stderr, "\t%s\n", *a);
811
/* Work around Debian bug #633582:
812
<https://bugs.debian.org/633582> */
813
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
814
if(plugindir_fd == -1){
816
error(0, errno, "open(\"" PDIR "\")");
819
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
821
error(0, errno, "fstat");
823
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
824
ret = fchown(plugindir_fd, uid, gid);
826
error(0, errno, "fchown");
834
/* Lower permissions */
837
error(0, errno, "setgid");
841
error(0, errno, "setuid");
844
/* Open plugin directory with close_on_exec flag */
846
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
849
#else /* not O_CLOEXEC */
851
#endif /* not O_CLOEXEC */
854
error(0, errno, "Could not open plugin dir");
855
exitstatus = EX_UNAVAILABLE;
860
/* Set the FD_CLOEXEC flag on the directory */
861
ret = set_cloexec_flag(dir_fd);
863
error(0, errno, "set_cloexec_flag");
864
exitstatus = EX_OSERR;
867
#endif /* O_CLOEXEC */
870
int good_name(const struct dirent * const dirent){
871
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
872
"*.dpkg-old", "*.dpkg-bak",
873
"*.dpkg-divert", NULL };
875
#pragma GCC diagnostic push
876
#pragma GCC diagnostic ignored "-Wcast-qual"
878
for(const char **pat = (const char **)patterns;
879
*pat != NULL; pat++){
881
#pragma GCC diagnostic pop
883
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
886
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
887
" matching pattern %s\n", dirent->d_name, *pat);
895
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
897
if(numplugins == -1){
898
error(0, errno, "Could not scan plugin dir");
900
exitstatus = EX_OSERR;
906
/* Read and execute any executable in the plugin directory*/
907
for(int i = 0; i < numplugins; i++){
909
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
911
error(0, errno, "Could not open plugin");
915
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
917
error(0, errno, "stat");
923
/* Ignore non-executable files */
924
if(not S_ISREG(st.st_mode)
925
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
928
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
929
" with bad type or mode\n",
930
plugindir != NULL ? plugindir : PDIR,
931
direntries[i]->d_name);
938
plugin *p = getplugin(direntries[i]->d_name);
940
error(0, errno, "getplugin");
947
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
948
direntries[i]->d_name);
955
/* Add global arguments to argument list for this plugin */
956
plugin *g = getplugin(NULL);
239
958
for(char **a = g->argv + 1; *a != NULL; a++){
242
if(execv(filename, p->argv) < 0){
249
close(pipefd[1]); /* close unused write end of pipe */
250
new_process->fd = pipefd[0];
251
new_process->buffer = malloc(BUFFER_SIZE);
252
if (new_process->buffer == NULL){
256
new_process->buffer_size = BUFFER_SIZE;
257
new_process->buffer_length = 0;
258
FD_SET(new_process->fd, &rfds_orig);
260
if (maxfd < new_process->fd){
261
maxfd = new_process->fd;
265
new_process->next = process_list;
266
process_list = new_process;
272
if (process_list != NULL){
274
fd_set rfds = rfds_orig;
275
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
276
if (select_ret == -1){
280
for(process *process_itr = process_list; process_itr != NULL;
281
process_itr = process_itr->next){
282
if(FD_ISSET(process_itr->fd, &rfds)){
283
if(process_itr->buffer_length + BUFFER_SIZE
284
> process_itr->buffer_size){
285
process_itr->buffer = realloc(process_itr->buffer,
286
process_itr->buffer_size
287
+ (size_t) BUFFER_SIZE);
288
if (process_itr->buffer == NULL){
292
process_itr->buffer_size += BUFFER_SIZE;
294
ret = read(process_itr->fd, process_itr->buffer
295
+ process_itr->buffer_length, BUFFER_SIZE);
297
/* Read error from this process; ignore it */
300
process_itr->buffer_length += (size_t) ret;
303
/* wait for process exit */
305
waitpid(process_itr->pid, &status, 0);
306
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
307
for(size_t written = 0;
308
written < process_itr->buffer_length;){
309
ret = write(STDOUT_FILENO,
310
process_itr->buffer + written,
311
process_itr->buffer_length - written);
316
written += (size_t)ret;
320
FD_CLR(process_itr->fd, &rfds_orig);
330
for(process *process_itr = process_list; process_itr != NULL;
331
process_itr = process_itr->next){
332
close(process_itr->fd);
333
kill(process_itr->pid, SIGTERM);
334
free(process_itr->buffer);
959
if(not add_argument(p, *a)){
960
error(0, errno, "add_argument");
963
/* Add global environment variables */
964
for(char **e = g->environ; *e != NULL; e++){
965
if(not add_environment(p, *e, false)){
966
error(0, errno, "add_environment");
971
/* If this plugin has any environment variables, we need to
972
duplicate the environment from this process, too. */
973
if(p->environ[0] != NULL){
974
for(char **e = environ; *e != NULL; e++){
975
if(not add_environment(p, *e, false)){
976
error(0, errno, "add_environment");
983
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
984
#else /* O_CLOEXEC */
985
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
986
#endif /* O_CLOEXEC */
988
error(0, errno, "pipe");
989
exitstatus = EX_OSERR;
993
if(pipefd[0] >= FD_SETSIZE){
994
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
998
exitstatus = EX_OSERR;
1003
/* Ask OS to automatic close the pipe on exec */
1004
ret = set_cloexec_flag(pipefd[0]);
1006
error(0, errno, "set_cloexec_flag");
1009
exitstatus = EX_OSERR;
1010
free(direntries[i]);
1013
ret = set_cloexec_flag(pipefd[1]);
1015
error(0, errno, "set_cloexec_flag");
1018
exitstatus = EX_OSERR;
1019
free(direntries[i]);
1022
#endif /* not O_CLOEXEC */
1023
/* Block SIGCHLD until process is safely in process list */
1024
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1025
&sigchld_action.sa_mask,
1028
error(0, errno, "sigprocmask");
1029
exitstatus = EX_OSERR;
1030
free(direntries[i]);
1033
/* Starting a new process to be watched */
1037
} while(pid == -1 and errno == EINTR);
1039
error(0, errno, "fork");
1040
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1041
&sigchld_action.sa_mask, NULL));
1044
exitstatus = EX_OSERR;
1045
free(direntries[i]);
1049
/* this is the child process */
1050
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1052
error(0, errno, "sigaction");
1055
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1057
error(0, errno, "sigprocmask");
1061
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1063
error(0, errno, "dup2");
1067
if(fexecve(plugin_fd, p->argv,
1068
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1069
error(0, errno, "fexecve for %s/%s",
1070
plugindir != NULL ? plugindir : PDIR,
1071
direntries[i]->d_name);
1076
/* Parent process */
1077
close(pipefd[1]); /* Close unused write end of pipe */
1079
plugin *new_plugin = getplugin(direntries[i]->d_name);
1080
if(new_plugin == NULL){
1081
error(0, errno, "getplugin");
1082
ret = (int)(TEMP_FAILURE_RETRY
1083
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1086
error(0, errno, "sigprocmask");
1088
exitstatus = EX_OSERR;
1089
free(direntries[i]);
1092
free(direntries[i]);
1094
new_plugin->pid = pid;
1095
new_plugin->fd = pipefd[0];
1097
/* Unblock SIGCHLD so signal handler can be run if this process
1098
has already completed */
1099
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1100
&sigchld_action.sa_mask,
1103
error(0, errno, "sigprocmask");
1104
exitstatus = EX_OSERR;
1108
FD_SET(new_plugin->fd, &rfds_all);
1110
if(maxfd < new_plugin->fd){
1111
maxfd = new_plugin->fd;
1119
free_plugin(getplugin(NULL));
1121
for(plugin *p = plugin_list; p != NULL; p = p->next){
1125
if(p->next == NULL){
1126
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1132
/* Main loop while running plugins exist */
1134
fd_set rfds = rfds_all;
1135
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1136
if(select_ret == -1 and errno != EINTR){
1137
error(0, errno, "select");
1138
exitstatus = EX_OSERR;
1141
/* OK, now either a process completed, or something can be read
1143
for(plugin *proc = plugin_list; proc != NULL;){
1144
/* Is this process completely done? */
1145
if(proc->completed and proc->eof){
1146
/* Only accept the plugin output if it exited cleanly */
1147
if(not WIFEXITED(proc->status)
1148
or WEXITSTATUS(proc->status) != 0){
1149
/* Bad exit by plugin */
1152
if(WIFEXITED(proc->status)){
1153
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1154
" status %d\n", proc->name,
1155
(intmax_t) (proc->pid),
1156
WEXITSTATUS(proc->status));
1157
} else if(WIFSIGNALED(proc->status)){
1158
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1159
" signal %d: %s\n", proc->name,
1160
(intmax_t) (proc->pid),
1161
WTERMSIG(proc->status),
1162
strsignal(WTERMSIG(proc->status)));
1166
/* Remove the plugin */
1167
FD_CLR(proc->fd, &rfds_all);
1169
/* Block signal while modifying process_list */
1170
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1172
&sigchld_action.sa_mask,
1175
error(0, errno, "sigprocmask");
1176
exitstatus = EX_OSERR;
1180
plugin *next_plugin = proc->next;
1184
/* We are done modifying process list, so unblock signal */
1185
ret = (int)(TEMP_FAILURE_RETRY
1186
(sigprocmask(SIG_UNBLOCK,
1187
&sigchld_action.sa_mask, NULL)));
1189
error(0, errno, "sigprocmask");
1190
exitstatus = EX_OSERR;
1194
if(plugin_list == NULL){
1201
/* This process exited nicely, so print its buffer */
1203
bool bret = print_out_password(proc->buffer,
1204
proc->buffer_length);
1206
error(0, errno, "print_out_password");
1207
exitstatus = EX_IOERR;
1212
/* This process has not completed. Does it have any output? */
1213
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1214
/* This process had nothing to say at this time */
1218
/* Before reading, make the process' data buffer large enough */
1219
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1220
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1221
+ (size_t) BUFFER_SIZE);
1222
if(new_buffer == NULL){
1223
error(0, errno, "malloc");
1224
exitstatus = EX_OSERR;
1227
proc->buffer = new_buffer;
1228
proc->buffer_size += BUFFER_SIZE;
1230
/* Read from the process */
1231
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1233
+ proc->buffer_length,
1236
/* Read error from this process; ignore the error */
1244
proc->buffer_length += (size_t) sret;
1252
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1253
and exitstatus != EX_OK)){
1254
/* Fallback if all plugins failed, none are found or an error
1257
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1258
char *passwordbuffer = getpass("Password: ");
1259
size_t len = strlen(passwordbuffer);
1260
/* Strip trailing newline */
1261
if(len > 0 and passwordbuffer[len-1] == '\n'){
1262
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1265
bret = print_out_password(passwordbuffer, len);
1267
error(0, errno, "print_out_password");
1268
exitstatus = EX_IOERR;
1272
/* Restore old signal handler */
1273
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1275
error(0, errno, "sigaction");
1276
exitstatus = EX_OSERR;
1279
if(custom_argv != NULL){
1280
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1292
/* Kill the processes */
1293
for(plugin *p = plugin_list; p != NULL; p = p->next){
1296
ret = kill(p->pid, SIGTERM);
1297
if(ret == -1 and errno != ESRCH){
1298
/* Set-uid proccesses might not get closed */
1299
error(0, errno, "kill");
1304
/* Wait for any remaining child processes to terminate */
1308
if(errno != ECHILD){
1309
error(0, errno, "wait");
1315
free(pluginhelperdir);