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/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
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/* -*- coding: utf-8 -*- */
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* Mandos plugin runner - Run Mandos plugins
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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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* 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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* 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 Mandos. If not, see <http://www.gnu.org/licenses/>.
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* along with this program. If not, see
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* <http://www.gnu.org/licenses/>.
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* Contact the authors at <mandos@recompile.se>.
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* Contact the authors at <mandos@fukt.bsnet.se>.
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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 <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
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EXIT_SUCCESS, realloc() */
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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 <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 <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 <sys/stat.h> /* struct stat, stat(), 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 <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 <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 <string.h> /* strsep, strlen(), asprintf() */
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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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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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volatile bool completed;
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struct plugin *next;
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static plugin *plugin_list = NULL;
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/* Gets an existing plugin based on name,
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/* Gets a 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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/* Check for exiting plugin with that name */
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for (plugin *p = plugin_list; p != NULL; p = p->next){
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if ((p->name == name)
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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 = 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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plugin *new_plugin = malloc(sizeof(plugin));
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if (new_plugin == NULL){
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char *copy_name = NULL;
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if(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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copy_name = strdup(name);
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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 = (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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if (new_plugin->argv == NULL){
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free(new_plugin);
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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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new_plugin->environ = malloc(sizeof(char *));
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if(new_plugin->environ == NULL){
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free(new_plugin->argv);
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free(new_plugin);
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new_plugin->environ[0] = NULL;
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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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static bool add_environment(plugin *p, const char *def){
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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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for(char **e = p->environ; *e != NULL; e++){
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if(strncmp(*e, def, namelen+1) == 0){
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/* Refuse to add an existing variable */
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return add_to_char_array(def, &(p->environ), &(p->envc));
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* Based on the example in the GNU LibC manual chapter 13.13 "File
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* Descriptor Flags".
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| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
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* *Note File Descriptor Flags:(libc)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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static int set_cloexec_flag(int fd)
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int ret = fcntl(fd, F_GETFD, 0);
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/* If reading the flags failed, return error indication now. */
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/* Store modified flag word in the descriptor. */
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return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
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return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
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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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void handle_sigchld(__attribute__((unused)) int sig){
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plugin *proc = plugin_list;
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{ .name = "global-options", .key = 'g',
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.arg = "OPTION[,OPTION[,...]]",
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.doc = "Options passed to all plugins" },
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{ .name = "global-env", .key = 'G',
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{ .name = "global-env", .key = 'e',
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.arg = "VAR=value",
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.doc = "Environment variable passed to all plugins" },
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{ .name = "options-for", .key = 'o',
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.arg = "PLUGIN:OPTION[,OPTION[,...]]",
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.doc = "Options passed only to specified plugin" },
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{ .name = "env-for", .key = 'E',
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{ .name = "env-for", .key = 'f',
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.arg = "PLUGIN:ENV=value",
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.doc = "Environment variable passed to specified plugin" },
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{ .name = "disable", .key = 'd',
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.doc = "Disable a specific plugin", .group = 1 },
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{ .name = "enable", .key = 'e',
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.doc = "Enable a specific plugin", .group = 1 },
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{ .name = "plugin-dir", .key = 128,
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.arg = "DIRECTORY",
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.doc = "Specify a different plugin directory", .group = 2 },
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.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
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{ .name = "help", .key = '?',
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.doc = "Give this help list", .group = -1 },
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{ .name = "usage", .key = -3,
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.doc = "Give a short usage message", .group = -1 },
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{ .name = "version", .key = 'V',
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.doc = "Print program version", .group = -1 },
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__attribute__((nonnull(3)))
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error_t parse_opt(int key, char *arg, struct argp_state *state){
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error_t parse_opt (int key, char *arg, __attribute__((unused))
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struct argp_state *state) {
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/* Get the INPUT argument from `argp_parse', which we know is a
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pointer to our plugin list pointer. */
442
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case 'g': /* --global-options */
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while((p = strsep(&arg, ",")) != NULL){
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if(not add_argument(getplugin(NULL), p)){
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perror("add_argument");
382
return ARGP_ERR_UNKNOWN;
387
case 'e': /* --global-env */
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while((plugin_option = strsep(&arg, ",")) != NULL){
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if(not add_argument(getplugin(NULL), plugin_option)){
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case 'G': /* --global-env */
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if(add_environment(getplugin(NULL), arg, true)){
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char *envdef = strdup(arg);
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if(not add_environment(getplugin(NULL), envdef)){
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perror("add_environment");
458
401
case 'o': /* --options-for */
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char *option_list = strchr(arg, ':');
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if(option_list == NULL){
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argp_error(state, "No colon in \"%s\"", arg);
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argp_error(state, "Empty plugin name");
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while((option = strsep(&option_list, ",")) != NULL){
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if(not add_argument(getplugin(arg), option)){
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char *p_name = strsep(&arg, ":");
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if(p_name[0] == '\0'){
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char *opt = strsep(&arg, ":");
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while((p = strsep(&opt, ",")) != NULL){
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if(not add_argument(getplugin(p_name), p)){
418
perror("add_argument");
419
return ARGP_ERR_UNKNOWN;
482
case 'E': /* --env-for */
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case 'f': /* --env-for */
484
430
char *envdef = strchr(arg, ':');
485
431
if(envdef == NULL){
486
argp_error(state, "No colon in \"%s\"", arg);
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char *p_name = strndup(arg, (size_t) (envdef-arg));
493
argp_error(state, "Empty plugin name");
497
if(add_environment(getplugin(arg), envdef, true)){
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if(not add_environment(getplugin(p_name), envdef)){
440
perror("add_environment");
502
444
case 'd': /* --disable */
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plugin *p = getplugin(arg);
511
case 'e': /* --enable */
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plugin *p = getplugin(arg);
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plugin *p = getplugin(arg);
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return ARGP_ERR_UNKNOWN;
520
453
case 128: /* --plugin-dir */
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454
plugindir = strdup(arg);
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if(plugindir != NULL){
455
if(plugindir == NULL){
527
459
case 129: /* --config-file */
528
/* This is already done by parse_opt_config_file() */
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argfile = strdup(arg);
530
465
case 130: /* --userid */
531
tmp_id = strtoimax(arg, &tmp, 10);
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if(errno != 0 or tmp == arg or *tmp != '\0'
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or tmp_id != (uid_t)tmp_id){
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argp_error(state, "Bad user ID number: \"%s\", using %"
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PRIdMAX, arg, (intmax_t)uid);
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uid = (uid_t)strtol(arg, NULL, 10);
541
468
case 131: /* --groupid */
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tmp_id = strtoimax(arg, &tmp, 10);
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if(errno != 0 or tmp == arg or *tmp != '\0'
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or tmp_id != (gid_t)tmp_id){
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argp_error(state, "Bad group ID number: \"%s\", using %"
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PRIdMAX, arg, (intmax_t)gid);
469
gid = (gid_t)strtol(arg, NULL, 10);
552
471
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 */
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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,
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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,
475
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
480
return ARGP_ERR_UNKNOWN;
485
struct argp argp = { .options = options, .parser = parse_opt,
486
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
633
487
.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;
489
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
490
if (ret == ARGP_ERR_UNKNOWN){
491
fprintf(stderr, "Unknown error while parsing arguments\n");
492
exitstatus = EXIT_FAILURE;
654
/* Reset to the normal argument parser */
655
argp.parser = parse_opt;
657
/* Open the configfile if available */
496
/* Opens the configfile if aviable */
497
if (argfile == NULL){
659
498
conffp = fopen(AFILE, "r");
661
500
conffp = fopen(argfile, "r");
663
502
if(conffp != NULL){
664
503
char *org_line = NULL;
665
504
char *p, *arg, *new_arg, *line;
667
507
const char whitespace_delims[] = " \r\t\f\v\n";
668
508
const char comment_delim[] = "#";
671
511
custom_argv = malloc(sizeof(char*) * 2);
672
512
if(custom_argv == NULL){
673
error(0, errno, "malloc");
674
exitstatus = EX_OSERR;
514
exitstatus = EXIT_FAILURE;
677
517
custom_argv[0] = argv[0];
678
518
custom_argv[1] = NULL;
680
520
/* for each line in the config file, strip whitespace and ignore
681
521
commented text */
694
534
new_arg = strdup(p);
695
535
if(new_arg == NULL){
696
error(0, errno, "strdup");
697
exitstatus = EX_OSERR;
537
exitstatus = EXIT_FAILURE;
702
542
custom_argc += 1;
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;
543
custom_argv = realloc(custom_argv, sizeof(char *)
544
* ((unsigned int) custom_argc + 1));
545
if(custom_argv == NULL){
547
exitstatus = EXIT_FAILURE;
716
551
custom_argv[custom_argc-1] = new_arg;
717
custom_argv[custom_argc] = NULL;
552
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
557
/* Check for harmful errors and go to fallback. Other errors might
731
558
not affect opening plugins */
732
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
733
error(0, errno, "fopen");
734
exitstatus = EX_OSERR;
559
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
561
exitstatus = EXIT_FAILURE;
738
/* If there were any arguments from the configuration file, pass
739
them to parser as command line arguments */
565
/* If there was any arguments from configuration file,
566
pass them to parser as command arguments */
740
567
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);
568
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, NULL);
569
if (ret == ARGP_ERR_UNKNOWN){
570
fprintf(stderr, "Unknown error while parsing arguments\n");
571
exitstatus = EXIT_FAILURE;
797
for(plugin *p = plugin_list; p != NULL; p = p->next){
577
for(plugin *p = plugin_list; p != NULL; p=p->next){
798
578
fprintf(stderr, "Plugin: %s has %d arguments\n",
799
579
p->name ? p->name : "Global", p->argc - 1);
800
580
for(char **a = p->argv; *a != NULL; a++){
801
581
fprintf(stderr, "\tArg: %s\n", *a);
803
fprintf(stderr, "...and %d environment variables\n", p->envc);
583
fprintf(stderr, "...and %u environment variables\n", p->envc);
804
584
for(char **a = p->environ; *a != NULL; a++){
805
585
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");
590
/* Strip permissions down to nobody */
839
591
ret = setuid(uid);
841
error(0, errno, "setuid");
844
/* Open plugin directory with close_on_exec flag */
600
if (plugindir == NULL){
603
dir = opendir(plugindir);
607
perror("Could not open plugin dir");
608
exitstatus = EXIT_FAILURE;
612
/* Set the FD_CLOEXEC flag on the directory, if possible */
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);
614
int dir_fd = dirfd(dir);
616
ret = set_cloexec_flag(dir_fd);
618
perror("set_cloexec_flag");
619
exitstatus = EXIT_FAILURE;
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;
904
625
FD_ZERO(&rfds_all);
906
627
/* 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");
629
dirst = readdir(dir);
631
// All directory entries have been processed
635
exitstatus = EXIT_FAILURE;
641
d_name_len = strlen(dirst->d_name);
643
// Ignore dotfiles, backup files and other junk
645
bool bad_name = false;
647
const char const *bad_prefixes[] = { ".", "#", NULL };
649
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
651
".dpkg-divert", NULL };
652
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
653
size_t pre_len = strlen(*pre);
654
if((d_name_len >= pre_len)
655
and strncmp((dirst->d_name), *pre, pre_len) == 0){
657
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
658
" with bad prefix %s\n", dirst->d_name, *pre);
667
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
668
size_t suf_len = strlen(*suf);
669
if((d_name_len >= suf_len)
670
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
673
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
674
" with bad suffix %s\n", dirst->d_name, *suf);
687
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
693
ret = stat(filename, &st);
923
700
/* Ignore non-executable files */
924
if(not S_ISREG(st.st_mode)
925
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
701
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
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);
703
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
704
" with bad type or mode\n", filename);
938
plugin *p = getplugin(direntries[i]->d_name);
710
plugin *p = getplugin(dirst->d_name);
940
error(0, errno, "getplugin");
947
718
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
948
direntries[i]->d_name);
958
728
for(char **a = g->argv + 1; *a != NULL; a++){
959
729
if(not add_argument(p, *a)){
960
error(0, errno, "add_argument");
730
perror("add_argument");
963
733
/* Add global environment variables */
964
734
for(char **e = g->environ; *e != NULL; e++){
965
if(not add_environment(p, *e, false)){
966
error(0, errno, "add_environment");
735
if(not add_environment(p, *e)){
736
perror("add_environment");
971
/* If this plugin has any environment variables, we need to
972
duplicate the environment from this process, too. */
741
/* If this plugin has any environment variables, we will call
742
using execve and need to duplicate the environment from this
973
744
if(p->environ[0] != NULL){
974
745
for(char **e = environ; *e != NULL; e++){
975
if(not add_environment(p, *e, false)){
976
error(0, errno, "add_environment");
746
char *copy = strdup(*e);
751
if(not add_environment(p, copy)){
752
perror("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;
761
exitstatus = EXIT_FAILURE;
1003
764
/* Ask OS to automatic close the pipe on exec */
1004
765
ret = set_cloexec_flag(pipefd[0]);
1006
error(0, errno, "set_cloexec_flag");
1009
exitstatus = EX_OSERR;
1010
free(direntries[i]);
767
perror("set_cloexec_flag");
768
exitstatus = EXIT_FAILURE;
1013
771
ret = set_cloexec_flag(pipefd[1]);
1015
error(0, errno, "set_cloexec_flag");
1018
exitstatus = EX_OSERR;
1019
free(direntries[i]);
773
perror("set_cloexec_flag");
774
exitstatus = EXIT_FAILURE;
1022
#endif /* not O_CLOEXEC */
1023
777
/* Block SIGCHLD until process is safely in process list */
1024
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1025
&sigchld_action.sa_mask,
778
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1028
error(0, errno, "sigprocmask");
1029
exitstatus = EX_OSERR;
1030
free(direntries[i]);
780
perror("sigprocmask");
781
exitstatus = EXIT_FAILURE;
1033
/* Starting a new process to be watched */
1037
} while(pid == -1 and errno == EINTR);
784
// Starting a new process to be watched
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]);
788
exitstatus = EXIT_FAILURE;
1049
792
/* this is the child process */
1050
793
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1052
error(0, errno, "sigaction");
1055
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
798
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1057
error(0, errno, "sigprocmask");
800
perror("sigprocmask");
1061
804
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);
811
/* If dir has no file descriptor, we could not set FD_CLOEXEC
812
above and must now close it manually here. */
815
if(p->environ[0] == NULL){
816
if(execv(filename, p->argv) < 0){
821
if(execve(filename, p->argv, p->environ) < 0){
1076
828
/* Parent process */
1077
829
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,
831
plugin *new_plugin = getplugin(dirst->d_name);
832
if (new_plugin == NULL){
834
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1086
error(0, errno, "sigprocmask");
836
perror("sigprocmask");
1088
exitstatus = EX_OSERR;
1089
free(direntries[i]);
838
exitstatus = EXIT_FAILURE;
1092
free(direntries[i]);
1094
842
new_plugin->pid = pid;
1095
843
new_plugin->fd = pipefd[0];
1097
845
/* Unblock SIGCHLD so signal handler can be run if this process
1098
846
has already completed */
1099
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1100
&sigchld_action.sa_mask,
847
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1103
error(0, errno, "sigprocmask");
1104
exitstatus = EX_OSERR;
849
perror("sigprocmask");
850
exitstatus = EXIT_FAILURE;
1108
854
FD_SET(new_plugin->fd, &rfds_all);
1110
if(maxfd < new_plugin->fd){
856
if (maxfd < new_plugin->fd){
1111
857
maxfd = new_plugin->fd;
1119
free_plugin(getplugin(NULL));
1121
865
for(plugin *p = plugin_list; p != NULL; p = p->next){
1122
866
if(p->pid != 0){
1128
872
free_plugin_list();
1132
876
/* Main loop while running plugins exist */
1133
877
while(plugin_list){
1134
878
fd_set rfds = rfds_all;
1135
879
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;
880
if (select_ret == -1){
882
exitstatus = EXIT_FAILURE;
1141
885
/* OK, now either a process completed, or something can be read
1142
886
from one of them */
1143
for(plugin *proc = plugin_list; proc != NULL;){
887
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1144
888
/* Is this process completely done? */
1145
if(proc->completed and proc->eof){
889
if(proc->eof and proc->completed){
1146
890
/* Only accept the plugin output if it exited cleanly */
1147
891
if(not WIFEXITED(proc->status)
1148
892
or WEXITSTATUS(proc->status) != 0){
1149
893
/* Bad exit by plugin */
1152
896
if(WIFEXITED(proc->status)){
1153
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1154
" status %d\n", proc->name,
1155
(intmax_t) (proc->pid),
897
fprintf(stderr, "Plugin %u exited with status %d\n",
898
(unsigned int) (proc->pid),
1156
899
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)));
900
} else if(WIFSIGNALED(proc->status)) {
901
fprintf(stderr, "Plugin %u killed by signal %d\n",
902
(unsigned int) (proc->pid),
903
WTERMSIG(proc->status));
904
} else if(WCOREDUMP(proc->status)){
905
fprintf(stderr, "Plugin %d dumped core\n",
906
(unsigned int) (proc->pid));
1166
910
/* Remove the plugin */
1167
911
FD_CLR(proc->fd, &rfds_all);
1169
913
/* Block signal while modifying process_list */
1170
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1172
&sigchld_action.sa_mask,
914
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1175
error(0, errno, "sigprocmask");
1176
exitstatus = EX_OSERR;
916
perror("sigprocmask");
917
exitstatus = EXIT_FAILURE;
1180
plugin *next_plugin = proc->next;
1181
920
free_plugin(proc);
1184
921
/* 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)));
922
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
1189
error(0, errno, "sigprocmask");
1190
exitstatus = EX_OSERR;
925
perror("sigprocmask");
926
exitstatus = EXIT_FAILURE;
1194
930
if(plugin_list == NULL){
1201
936
/* This process exited nicely, so print its buffer */
1203
938
bool bret = print_out_password(proc->buffer,
1204
939
proc->buffer_length);
1206
error(0, errno, "print_out_password");
1207
exitstatus = EX_IOERR;
941
perror("print_out_password");
942
exitstatus = EXIT_FAILURE;
1212
947
/* This process has not completed. Does it have any output? */
1213
948
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1214
949
/* This process had nothing to say at this time */
1218
952
/* Before reading, make the process' data buffer large enough */
1219
953
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;
954
proc->buffer = realloc(proc->buffer, proc->buffer_size
955
+ (size_t) BUFFER_SIZE);
956
if (proc->buffer == NULL){
958
exitstatus = EXIT_FAILURE;
1227
proc->buffer = new_buffer;
1228
961
proc->buffer_size += BUFFER_SIZE;
1230
963
/* Read from the process */
1231
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1233
+ proc->buffer_length,
964
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1236
967
/* Read error from this process; ignore the error */
1242
972
proc->eof = true;
1244
proc->buffer_length += (size_t) sret;
974
proc->buffer_length += (size_t) ret;
1252
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1253
and exitstatus != EX_OK)){
982
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1254
983
/* Fallback if all plugins failed, none are found or an error
1257
986
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1258
987
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);
988
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1267
error(0, errno, "print_out_password");
1268
exitstatus = EX_IOERR;
990
perror("print_out_password");
991
exitstatus = EXIT_FAILURE;
1272
995
/* Restore old signal handler */
1273
996
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1275
error(0, errno, "sigaction");
1276
exitstatus = EX_OSERR;
999
exitstatus = EXIT_FAILURE;
1279
1002
if(custom_argv != NULL){
1280
1003
for(char **arg = custom_argv+1; *arg != NULL; arg++){