/mandos/trunk : revision 392

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/* -*- coding: utf-8 -*- */

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/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */

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/*

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* Mandos plugin runner - Run Mandos plugins

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*

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*

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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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*/

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#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),

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asprintf() */

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asprintf(), O_CLOEXEC */

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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 <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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#include <stdio.h> /* perror, fileno(), fprintf(),

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stderr, STDOUT_FILENO */

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#include <sys/types.h> /* DIR, fdopendir(), 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() */

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WEXITSTATUS(), WTERMSIG(),

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WCOREDUMP() */

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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> /* DIR, struct dirent, opendir(),

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#include <dirent.h> /* DIR, struct dirent, fdopendir(),

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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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dup2(), STDOUT_FILENO, _exit(),

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execv(), write(), read(),

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close() */

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#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,

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FD_CLOEXEC */

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#include <string.h> /* strsep, strlen(), asprintf() */

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#include <string.h> /* strsep, strlen(), asprintf(),

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strsignal() */

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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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#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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*/

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#include <errno.h> /* errno, EBADF */

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#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */

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#define BUFFER_SIZE 256

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#define PDIR "/lib/mandos/plugins.d"

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#define AFILE "/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_version = "plugin-runner " VERSION;

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const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";

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struct plugin;

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typedef struct plugin{

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char *name; /* can be NULL or any plugin name */

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char **argv;

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char **environ;

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int envc;

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bool disabled;

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/* Variables used for running processes*/

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pid_t pid;

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int fd;

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size_t buffer_size;

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size_t buffer_length;

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bool eof;

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volatile bool completed;

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volatile int status;

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volatile sig_atomic_t completed;

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int status;

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struct plugin *next;

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} plugin;

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or if none is found, creates a new one */

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static plugin *getplugin(char *name){

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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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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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return p;

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}

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}

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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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plugin *new_plugin = NULL;

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do {

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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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return NULL;

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}

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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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do {

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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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free(new_plugin);

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return NULL;

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}

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}

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*new_plugin = (plugin) { .name = copy_name,

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.argc = 1,

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.disabled = false,

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.next = plugin_list };

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*new_plugin = (plugin){ .name = copy_name,

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.argc = 1,

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.disabled = false,

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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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do {

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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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free(copy_name);

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free(new_plugin);

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return 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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do {

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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(copy_name);

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free(new_plugin->argv);

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164

static bool add_to_char_array(const char *new, char ***array,

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int *len){

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/* Resize the pointed-to array to hold one more pointer */

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*array = realloc(*array, sizeof(char *)

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* (size_t) ((*len) + 2));

167

do {

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*array = realloc(*array, sizeof(char *)

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* (size_t) ((*len) + 2));

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} while(*array == NULL and errno == EINTR);

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/* Malloc check */

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if(*array == NULL){

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return false;

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}

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/* Make a copy of the new string */

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char *copy = strdup(new);

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char *copy;

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do {

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copy = strdup(new);

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} while(copy == NULL and errno == EINTR);

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if(copy == NULL){

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return false;

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}

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if(strncmp(*e, def, namelen + 1) == 0){

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/* It already exists */

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if(replace){

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char *new = realloc(*e, strlen(def) + 1);

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char *new;

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do {

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new = realloc(*e, strlen(def) + 1);

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} while(new == NULL and errno == EINTR);

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if(new == NULL){

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return false;

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}

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/*

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* Based on the example in the GNU LibC manual chapter 13.13 "File

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* Descriptor Flags".

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* *Note File Descriptor Flags:(libc)Descriptor Flags.

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| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |

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*/

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static int set_cloexec_flag(int fd)

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{

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int ret = fcntl(fd, F_GETFD, 0);

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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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if(ret < 0){

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return ret;

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}

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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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ret | FD_CLOEXEC));

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}

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/* Mark processes as completed when they exit, and save their exit

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status. */

225

void handle_sigchld(__attribute__((unused)) int sig){

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static void handle_sigchld(__attribute__((unused)) int sig){

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int old_errno = errno;

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while(true){

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plugin *proc = plugin_list;

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int status;

232

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break;

233

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}

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if(pid == -1){

235

if (errno != ECHILD){

236

perror("waitpid");

257

if(errno == ECHILD){

258

/* No child processes */

259

break;

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}

238

/* No child processes */

239

break;

261

perror("waitpid");

240

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}

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/* A child exited, find it in process_list */

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continue;

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}

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proc->status = status;

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proc->completed = true;

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proc->completed = 1;

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}

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errno = old_errno;

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}

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/* Prints out a password to stdout */

256

bool print_out_password(const char *buffer, size_t length){

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static bool print_out_password(const char *buffer, size_t length){

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ssize_t ret;

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if(length>0 and buffer[length-1] == '\n'){

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length--;

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}

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for(size_t written = 0; written < length; written += (size_t)ret){

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ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,

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length - written));

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}

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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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struct stat st;

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fd_set rfds_all;

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int ret, maxfd = 0;

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ssize_t sret;

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uid_t uid = 65534;

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gid_t gid = 65534;

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bool debug = false;

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{ .name = NULL }

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};

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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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switch (key) {

400

error_t parse_opt(int key, char *arg, __attribute__((unused))

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struct argp_state *state){

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switch(key){

403

char *tmp;

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intmax_t tmpmax;

382

405

case 'g': /* --global-options */

383

if (arg != NULL){

384

char *p;

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while((p = strsep(&arg, ",")) != NULL){

386

if(p[0] == '\0'){

406

if(arg != NULL){

407

char *plugin_option;

408

while((plugin_option = strsep(&arg, ",")) != NULL){

409

if(plugin_option[0] == '\0'){

387

410

continue;

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}

389

if(not add_argument(getplugin(NULL), p)){

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if(not add_argument(getplugin(NULL), plugin_option)){

390

413

perror("add_argument");

391

414

return ARGP_ERR_UNKNOWN;

392

415

}

397

420

if(arg == NULL){

398

421

break;

399

422

}

400

{

401

char *envdef = strdup(arg);

402

if(envdef == NULL){

403

break;

404

}

405

if(not add_environment(getplugin(NULL), envdef, true)){

406

perror("add_environment");

407

}

423

if(not add_environment(getplugin(NULL), arg, true)){

424

perror("add_environment");

408

425

}

409

426

break;

410

427

case 'o': /* --options-for */

411

if (arg != NULL){

412

char *p_name = strsep(&arg, ":");

413

if(p_name[0] == '\0' or arg == NULL){

414

break;

415

}

416

char *opt = strsep(&arg, ":");

417

if(opt[0] == '\0' or opt == NULL){

418

break;

419

}

420

char *p;

421

while((p = strsep(&opt, ",")) != NULL){

422

if(p[0] == '\0'){

423

continue;

424

}

425

if(not add_argument(getplugin(p_name), p)){

428

if(arg != NULL){

429

char *plugin_name = strsep(&arg, ":");

430

if(plugin_name[0] == '\0'){

431

break;

432

}

433

char *plugin_option;

434

while((plugin_option = strsep(&arg, ",")) != NULL){

435

if(not add_argument(getplugin(plugin_name), plugin_option)){

426

436

perror("add_argument");

427

437

return ARGP_ERR_UNKNOWN;

428

438

}

438

448

if(envdef == NULL){

439

449

break;

440

450

}

441

char *p_name = strndup(arg, (size_t) (envdef-arg));

442

if(p_name == NULL){

443

break;

444

}

445

envdef++;

446

if(not add_environment(getplugin(p_name), envdef, true)){

451

*envdef = '\0';

452

if(not add_environment(getplugin(arg), envdef+1, true)){

447

453

perror("add_environment");

448

454

}

449

455

}

450

456

break;

451

457

case 'd': /* --disable */

452

if (arg != NULL){

458

if(arg != NULL){

453

459

plugin *p = getplugin(arg);

454

460

if(p == NULL){

455

461

return ARGP_ERR_UNKNOWN;

458

464

}

459

465

break;

460

466

case 'e': /* --enable */

461

if (arg != NULL){

467

if(arg != NULL){

462

468

plugin *p = getplugin(arg);

463

469

if(p == NULL){

464

470

return ARGP_ERR_UNKNOWN;

467

473

}

468

474

break;

469

475

case 128: /* --plugin-dir */

476

free(plugindir);

470

477

plugindir = strdup(arg);

471

478

if(plugindir == NULL){

472

479

perror("strdup");

473

}

480

}

474

481

break;

475

482

case 129: /* --config-file */

476

483

/* This is already done by parse_opt_config_file() */

477

484

break;

478

485

case 130: /* --userid */

479

uid = (uid_t)strtol(arg, NULL, 10);

486

errno = 0;

487

tmpmax = strtoimax(arg, &tmp, 10);

488

if(errno != 0 or tmp == arg or *tmp != '\0'

489

or tmpmax != (uid_t)tmpmax){

490

fprintf(stderr, "Bad user ID number: \"%s\", using %"

491

PRIdMAX "\n", arg, (intmax_t)uid);

492

} else {

493

uid = (uid_t)tmpmax;

494

}

480

495

break;

481

496

case 131: /* --groupid */

482

gid = (gid_t)strtol(arg, NULL, 10);

497

errno = 0;

498

tmpmax = strtoimax(arg, &tmp, 10);

499

if(errno != 0 or tmp == arg or *tmp != '\0'

500

or tmpmax != (gid_t)tmpmax){

501

fprintf(stderr, "Bad group ID number: \"%s\", using %"

502

PRIdMAX "\n", arg, (intmax_t)gid);

503

} else {

504

gid = (gid_t)tmpmax;

505

}

483

506

break;

484

507

case 132: /* --debug */

485

508

debug = true;

486

509

break;

510

/*

511

* When adding more options before this line, remember to also add a

512

* "case" to the "parse_opt_config_file" function below.

513

*/

487

514

case ARGP_KEY_ARG:

488

fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);

515

/* Cryptsetup always passes an argument, which is an empty

516

string if "none" was specified in /etc/crypttab. So if

517

argument was empty, we ignore it silently. */

518

if(arg[0] != '\0'){

519

fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);

520

}

489

521

break;

490

522

case ARGP_KEY_END:

491

523

break;

497

529

498

530

/* This option parser is the same as parse_opt() above, except it

499

531

ignores everything but the --config-file option. */

500

error_t parse_opt_config_file (int key, char *arg,

501

__attribute__((unused))

502

struct argp_state *state) {

503

switch (key) {

532

error_t parse_opt_config_file(int key, char *arg,

533

__attribute__((unused))

534

struct argp_state *state){

535

switch(key){

504

536

case 'g': /* --global-options */

505

537

case 'G': /* --global-env */

506

538

case 'o': /* --options-for */

510

542

case 128: /* --plugin-dir */

511

543

break;

512

544

case 129: /* --config-file */

545

free(argfile);

513

546

argfile = strdup(arg);

514

547

if(argfile == NULL){

515

548

perror("strdup");

516

549

}

517

break;

550

break;

518

551

case 130: /* --userid */

519

552

case 131: /* --groupid */

520

553

case 132: /* --debug */

532

565

.args_doc = "",

533

566

.doc = "Mandos plugin runner -- Run plugins" };

534

567

535

/* Parse using the parse_opt_config_file in order to get the custom

568

/* Parse using parse_opt_config_file() in order to get the custom

536

569

config file location, if any. */

537

ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);

538

if (ret == ARGP_ERR_UNKNOWN){

570

ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);

571

if(ret == ARGP_ERR_UNKNOWN){

539

572

fprintf(stderr, "Unknown error while parsing arguments\n");

540

573

exitstatus = EXIT_FAILURE;

541

574

goto fallback;

545

578

argp.parser = parse_opt;

546

579

547

580

/* Open the configfile if available */

548

if (argfile == NULL){

581

if(argfile == NULL){

549

582

conffp = fopen(AFILE, "r");

550

583

} else {

551

584

conffp = fopen(argfile, "r");

552

}

585

}

553

586

if(conffp != NULL){

554

587

char *org_line = NULL;

555

588

char *p, *arg, *new_arg, *line;

556

589

size_t size = 0;

557

ssize_t sret;

558

590

const char whitespace_delims[] = " \r\t\f\v\n";

559

591

const char comment_delim[] = "#";

560

592

561

593

custom_argc = 1;

562

594

custom_argv = malloc(sizeof(char*) * 2);

563

595

if(custom_argv == NULL){

567

599

}

568

600

custom_argv[0] = argv[0];

569

601

custom_argv[1] = NULL;

570

602

571

603

/* for each line in the config file, strip whitespace and ignore

572

604

commented text */

573

605

while(true){

575

607

if(sret == -1){

576

608

break;

577

609

}

578

610

579

611

line = org_line;

580

612

arg = strsep(&line, comment_delim);

581

613

while((p = strsep(&arg, whitespace_delims)) != NULL){

600

632

goto fallback;

601

633

}

602

634

custom_argv[custom_argc-1] = new_arg;

603

custom_argv[custom_argc] = NULL;

635

custom_argv[custom_argc] = NULL;

604

636

}

605

637

}

638

do {

639

ret = fclose(conffp);

640

} while(ret == EOF and errno == EINTR);

641

if(ret == EOF){

642

perror("fclose");

643

exitstatus = EXIT_FAILURE;

644

goto fallback;

645

}

606

646

free(org_line);

607

647

} else {

608

648

/* Check for harmful errors and go to fallback. Other errors might

609

649

not affect opening plugins */

610

if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){

650

if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){

611

651

perror("fopen");

612

652

exitstatus = EXIT_FAILURE;

613

653

goto fallback;

616

656

/* If there was any arguments from configuration file,

617

657

pass them to parser as command arguments */

618

658

if(custom_argv != NULL){

619

ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,

620

0, NULL);

621

if (ret == ARGP_ERR_UNKNOWN){

659

ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,

660

0, NULL);

661

if(ret == ARGP_ERR_UNKNOWN){

622

662

fprintf(stderr, "Unknown error while parsing arguments\n");

623

663

exitstatus = EXIT_FAILURE;

624

664

goto fallback;

627

667

628

668

/* Parse actual command line arguments, to let them override the

629

669

config file */

630

ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);

631

if (ret == ARGP_ERR_UNKNOWN){

670

ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);

671

if(ret == ARGP_ERR_UNKNOWN){

632

672

fprintf(stderr, "Unknown error while parsing arguments\n");

633

673

exitstatus = EXIT_FAILURE;

634

674

goto fallback;

641

681

for(char **a = p->argv; *a != NULL; a++){

642

682

fprintf(stderr, "\tArg: %s\n", *a);

643

683

}

644

fprintf(stderr, "...and %u environment variables\n", p->envc);

684

fprintf(stderr, "...and %d environment variables\n", p->envc);

645

685

for(char **a = p->environ; *a != NULL; a++){

646

686

fprintf(stderr, "\t%s\n", *a);

647

687

}

649

689

}

650

690

651

691

/* Strip permissions down to nobody */

692

setgid(gid);

693

if(ret == -1){

694

perror("setgid");

695

}

652

696

ret = setuid(uid);

653

if (ret == -1){

697

if(ret == -1){

654

698

perror("setuid");

655

}

656

setgid(gid);

657

if (ret == -1){

658

perror("setgid");

659

}

660

661

if (plugindir == NULL){

662

dir = opendir(PDIR);

663

} else {

664

dir = opendir(plugindir);

665

}

666

667

if(dir == NULL){

668

perror("Could not open plugin dir");

669

exitstatus = EXIT_FAILURE;

670

goto fallback;

671

}

672

673

/* Set the FD_CLOEXEC flag on the directory, if possible */

699

}

700

701

/* Open plugin directory with close_on_exec flag */

674

702

{

675

int dir_fd = dirfd(dir);

676

if(dir_fd >= 0){

677

ret = set_cloexec_flag(dir_fd);

678

if(ret < 0){

679

perror("set_cloexec_flag");

680

exitstatus = EXIT_FAILURE;

681

goto fallback;

682

}

703

int dir_fd = -1;

704

if(plugindir == NULL){

705

dir_fd = open(PDIR, O_RDONLY |

706

#ifdef O_CLOEXEC

707

O_CLOEXEC

708

#else /* not O_CLOEXEC */

709

0

710

#endif /* not O_CLOEXEC */

711

);

712

} else {

713

dir_fd = open(plugindir, O_RDONLY |

714

#ifdef O_CLOEXEC

715

O_CLOEXEC

716

#else /* not O_CLOEXEC */

717

0

718

#endif /* not O_CLOEXEC */

719

);

720

}

721

if(dir_fd == -1){

722

perror("Could not open plugin dir");

723

exitstatus = EXIT_FAILURE;

724

goto fallback;

725

}

726

727

#ifndef O_CLOEXEC

728

/* Set the FD_CLOEXEC flag on the directory */

729

ret = set_cloexec_flag(dir_fd);

730

if(ret < 0){

731

perror("set_cloexec_flag");

732

TEMP_FAILURE_RETRY(close(dir_fd));

733

exitstatus = EXIT_FAILURE;

734

goto fallback;

735

}

736

#endif /* O_CLOEXEC */

737

738

dir = fdopendir(dir_fd);

739

if(dir == NULL){

740

perror("Could not open plugin dir");

741

TEMP_FAILURE_RETRY(close(dir_fd));

742

exitstatus = EXIT_FAILURE;

743

goto fallback;

683

744

}

684

745

}

685

746

687

748

688

749

/* Read and execute any executable in the plugin directory*/

689

750

while(true){

690

dirst = readdir(dir);

751

do {

752

dirst = readdir(dir);

753

} while(dirst == NULL and errno == EINTR);

691

754

692

755

/* All directory entries have been processed */

693

756

if(dirst == NULL){

694

if (errno == EBADF){

757

if(errno == EBADF){

695

758

perror("readdir");

696

759

exitstatus = EXIT_FAILURE;

697

760

goto fallback;

709

772

710

773

const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",

711

774

".dpkg-old",

775

".dpkg-bak",

712

776

".dpkg-divert", NULL };

713

777

for(const char **pre = bad_prefixes; *pre != NULL; pre++){

714

778

size_t pre_len = strlen(*pre);

743

807

continue;

744

808

}

745

809

}

746

810

747

811

char *filename;

748

ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);

812

if(plugindir == NULL){

813

ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",

814

dirst->d_name));

815

} else {

816

ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",

817

plugindir,

818

dirst->d_name));

819

}

749

820

if(ret < 0){

750

821

perror("asprintf");

751

822

continue;

752

823

}

753

824

754

ret = stat(filename, &st);

755

if (ret == -1){

825

ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));

826

if(ret == -1){

756

827

perror("stat");

757

828

free(filename);

758

829

continue;

759

830

}

760

831

761

832

/* Ignore non-executable files */

762

if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){

833

if(not S_ISREG(st.st_mode)

834

or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){

763

835

if(debug){

764

836

fprintf(stderr, "Ignoring plugin dir entry \"%s\""

765

837

" with bad type or mode\n", filename);

811

883

}

812

884

813

885

int pipefd[2];

814

ret = pipe(pipefd);

815

if (ret == -1){

886

ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));

887

if(ret == -1){

816

888

perror("pipe");

817

889

exitstatus = EXIT_FAILURE;

818

890

goto fallback;

831

903

goto fallback;

832

904

}

833

905

/* Block SIGCHLD until process is safely in process list */

834

ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);

906

ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,

907

&sigchld_action.sa_mask,

908

NULL));

835

909

if(ret < 0){

836

910

perror("sigprocmask");

837

911

exitstatus = EXIT_FAILURE;

838

912

goto fallback;

839

913

}

840

914

/* Starting a new process to be watched */

841

pid_t pid = fork();

915

pid_t pid;

916

do {

917

pid = fork();

918

} while(pid == -1 and errno == EINTR);

842

919

if(pid == -1){

843

920

perror("fork");

844

921

exitstatus = EXIT_FAILURE;

851

928

perror("sigaction");

852

929

_exit(EXIT_FAILURE);

853

930

}

854

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);

931

ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);

855

932

if(ret < 0){

856

933

perror("sigprocmask");

857

934

_exit(EXIT_FAILURE);

858

935

}

859

936

860

937

ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */

861

938

if(ret == -1){

862

939

perror("dup2");

882

959

/* no return */

883

960

}

884

961

/* Parent process */

885

close(pipefd[1]); /* Close unused write end of pipe */

962

TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of

963

pipe */

886

964

free(filename);

887

965

plugin *new_plugin = getplugin(dirst->d_name);

888

if (new_plugin == NULL){

966

if(new_plugin == NULL){

889

967

perror("getplugin");

890

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);

968

ret = (int)(TEMP_FAILURE_RETRY

969

(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,

970

NULL)));

891

971

if(ret < 0){

892

972

perror("sigprocmask");

893

973

}

900

980

901

981

/* Unblock SIGCHLD so signal handler can be run if this process

902

982

has already completed */

903

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);

983

ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,

984

&sigchld_action.sa_mask,

985

NULL));

904

986

if(ret < 0){

905

987

perror("sigprocmask");

906

988

exitstatus = EXIT_FAILURE;

907

989

goto fallback;

908

990

}

909

991

910

FD_SET(new_plugin->fd, &rfds_all);

992

FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from

993

-Wconversion */

911

994

912

if (maxfd < new_plugin->fd){

995

if(maxfd < new_plugin->fd){

913

996

maxfd = new_plugin->fd;

914

997

}

915

916

998

}

917

999

918

closedir(dir);

1000

TEMP_FAILURE_RETRY(closedir(dir));

919

1001

dir = NULL;

920

1002

free_plugin(getplugin(NULL));

1003

921

1004

for(plugin *p = plugin_list; p != NULL; p = p->next){

922

1005

if(p->pid != 0){

923

1006

break;

928

1011

free_plugin_list();

929

1012

}

930

1013

}

931

1014

932

1015

/* Main loop while running plugins exist */

933

1016

while(plugin_list){

934

1017

fd_set rfds = rfds_all;

935

1018

int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);

936

if (select_ret == -1){

1019

if(select_ret == -1 and errno != EINTR){

937

1020

perror("select");

938

1021

exitstatus = EXIT_FAILURE;

939

1022

goto fallback;

940

1023

}

941

1024

/* OK, now either a process completed, or something can be read

942

1025

from one of them */

943

for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){

1026

for(plugin *proc = plugin_list; proc != NULL;){

944

1027

/* Is this process completely done? */

945

if(proc->eof and proc->completed){

1028

if(proc->completed and proc->eof){

946

1029

/* Only accept the plugin output if it exited cleanly */

947

1030

if(not WIFEXITED(proc->status)

948

1031

or WEXITSTATUS(proc->status) != 0){

949

1032

/* Bad exit by plugin */

950

1033

951

1034

if(debug){

952

1035

if(WIFEXITED(proc->status)){

953

fprintf(stderr, "Plugin %u exited with status %d\n",

954

(unsigned int) (proc->pid),

1036

fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"

1037

" status %d\n", proc->name,

1038

(intmax_t) (proc->pid),

955

1039

WEXITSTATUS(proc->status));

956

} else if(WIFSIGNALED(proc->status)) {

957

fprintf(stderr, "Plugin %u killed by signal %d\n",

958

(unsigned int) (proc->pid),

959

WTERMSIG(proc->status));

1040

} else if(WIFSIGNALED(proc->status)){

1041

fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"

1042

" signal %d: %s\n", proc->name,

1043

(intmax_t) (proc->pid),

1044

WTERMSIG(proc->status),

1045

strsignal(WTERMSIG(proc->status)));

960

1046

} else if(WCOREDUMP(proc->status)){

961

fprintf(stderr, "Plugin %d dumped core\n",

962

(unsigned int) (proc->pid));

1047

fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"

1048

" core\n", proc->name, (intmax_t) (proc->pid));

963

1049

}

964

1050

}

965

1051

966

1052

/* Remove the plugin */

967

FD_CLR(proc->fd, &rfds_all);

968

1053

FD_CLR(proc->fd, &rfds_all); /* Spurious warning from

1054

-Wconversion */

1055

969

1056

/* Block signal while modifying process_list */

970

ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);

1057

ret = (int)TEMP_FAILURE_RETRY(sigprocmask

1058

(SIG_BLOCK,

1059

&sigchld_action.sa_mask,

1060

NULL));

971

1061

if(ret < 0){

972

1062

perror("sigprocmask");

973

1063

exitstatus = EXIT_FAILURE;

974

1064

goto fallback;

975

1065

}

1066

1067

plugin *next_plugin = proc->next;

976

1068

free_plugin(proc);

1069

proc = next_plugin;

1070

977

1071

/* We are done modifying process list, so unblock signal */

978

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

979

NULL);

1072

ret = (int)(TEMP_FAILURE_RETRY

1073

(sigprocmask(SIG_UNBLOCK,

1074

&sigchld_action.sa_mask, NULL)));

980

1075

if(ret < 0){

981

1076

perror("sigprocmask");

982

1077

exitstatus = EXIT_FAILURE;

986

1081

if(plugin_list == NULL){

987

1082

break;

988

1083

}

1084

989

1085

continue;

990

1086

}

991

1087

992

1088

/* This process exited nicely, so print its buffer */

993

1089

994

1090

bool bret = print_out_password(proc->buffer,

995

1091

proc->buffer_length);

996

1092

if(not bret){

1001

1097

}

1002

1098

1003

1099

/* This process has not completed. Does it have any output? */

1004

if(proc->eof or not FD_ISSET(proc->fd, &rfds)){

1100

if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious

1101

warning from

1102

-Wconversion */

1005

1103

/* This process had nothing to say at this time */

1104

proc = proc->next;

1006

1105

continue;

1007

1106

}

1008

1107

/* Before reading, make the process' data buffer large enough */

1009

1108

if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){

1010

1109

proc->buffer = realloc(proc->buffer, proc->buffer_size

1011

1110

+ (size_t) BUFFER_SIZE);

1012

if (proc->buffer == NULL){

1111

if(proc->buffer == NULL){

1013

1112

perror("malloc");

1014

1113

exitstatus = EXIT_FAILURE;

1015

1114

goto fallback;

1017

1116

proc->buffer_size += BUFFER_SIZE;

1018

1117

}

1019

1118

/* Read from the process */

1020

ret = read(proc->fd, proc->buffer + proc->buffer_length,

1021

BUFFER_SIZE);

1022

if(ret < 0){

1119

sret = TEMP_FAILURE_RETRY(read(proc->fd,

1120

proc->buffer

1121

+ proc->buffer_length,

1122

BUFFER_SIZE));

1123

if(sret < 0){

1023

1124

/* Read error from this process; ignore the error */

1125

proc = proc->next;

1024

1126

continue;

1025

1127

}

1026

if(ret == 0){

1128

if(sret == 0){

1027

1129

/* got EOF */

1028

1130

proc->eof = true;

1029

1131

} else {

1030

proc->buffer_length += (size_t) ret;

1132

proc->buffer_length += (size_t) sret;

1031

1133

}

1032

1134

}

1033

1135

}

1034

1035

1136

1137

1036

1138

fallback:

1037

1139

1038

1140

if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){

1041

1143

bool bret;

1042

1144

fprintf(stderr, "Going to fallback mode using getpass(3)\n");

1043

1145

char *passwordbuffer = getpass("Password: ");

1044

bret = print_out_password(passwordbuffer, strlen(passwordbuffer));

1146

size_t len = strlen(passwordbuffer);

1147

/* Strip trailing newline */

1148

if(len > 0 and passwordbuffer[len-1] == '\n'){

1149

passwordbuffer[len-1] = '\0'; /* not strictly necessary */

1150

len--;

1151

}

1152

bret = print_out_password(passwordbuffer, len);

1045

1153

if(not bret){

1046

1154

perror("print_out_password");

1047

1155

exitstatus = EXIT_FAILURE;

1054

1162

perror("sigaction");

1055

1163

exitstatus = EXIT_FAILURE;

1056

1164

}

1057

1165

1058

1166

if(custom_argv != NULL){

1059

1167

for(char **arg = custom_argv+1; *arg != NULL; arg++){

1060

1168

free(*arg);

1066

1174

closedir(dir);

1067

1175

}

1068

1176

1069

/* Free the process list and kill the processes */

1177

/* Kill the processes */

1070

1178

for(plugin *p = plugin_list; p != NULL; p = p->next){

1071

1179

if(p->pid != 0){

1072

1180

close(p->fd);

1079

1187

}

1080

1188

1081

1189

/* Wait for any remaining child processes to terminate */

1082

do{

1190

do {

1083

1191

ret = wait(NULL);

1084

1192

} while(ret >= 0);

1085

1193

if(errno != ECHILD){

1086

1194

perror("wait");

1087

1195

}

1088

1196

1089

1197

free_plugin_list();

1090

1198

1091

1199

free(plugindir);