/mandos/trunk : revision 133

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

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

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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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#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, fileno(), fprintf(),

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stderr, STDOUT_FILENO */

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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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#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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WCOREDUMP() */

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WEXITSTATUS() */

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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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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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strsignal() */

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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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#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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*/

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SIG_UNBLOCK, kill() */

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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 " VERSION;

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const char *argp_program_version = "plugin-runner 1.0";

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

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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 sig_atomic_t completed;

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int status;

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volatile bool completed;

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volatile int status;

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struct plugin *next;

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} plugin;

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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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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 = 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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plugin *new_plugin = malloc(sizeof(plugin));

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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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do {

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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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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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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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*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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free(copy_name);

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free(new_plugin);

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return NULL;

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}

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new_plugin->argv[0] = copy_name;

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new_plugin->argv[1] = NULL;

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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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new_plugin->environ = malloc(sizeof(char *));

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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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return NULL;

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}

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new_plugin->environ[0] = NULL;

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/* Append the new plugin to the list */

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plugin_list = new_plugin;

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return new_plugin;

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

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

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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;

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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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char *copy = strdup(new);

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if(copy == NULL){

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return false;

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}

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}

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/* Add to a plugin's environment */

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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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if(p == NULL){

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return false;

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}

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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 **e = p->environ; *e != NULL; e++){

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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;

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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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*e = new;

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strcpy(*e, def);

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}

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return true;

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}

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}

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return add_to_char_array(def, &(p->environ), &(p->envc));

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

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

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*/

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static int set_cloexec_flag(int fd){

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

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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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/* 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 TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD, ret | FD_CLOEXEC));

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return fcntl(fd, F_SETFD, 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. */

245

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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while(true){

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plugin *proc = plugin_list;

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int status;

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break;

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}

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if(pid == -1){

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if(errno == ECHILD){

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/* No child processes */

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break;

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if (errno != ECHILD){

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perror("waitpid");

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}

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perror("waitpid");

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/* No child processes */

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break;

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}

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

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while(proc != NULL and proc->pid != pid){

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proc = proc->next;

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continue;

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}

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proc->status = status;

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proc->completed = 1;

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proc->completed = true;

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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 */

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

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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 = "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-envs", .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 = "envs-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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.arg = "PLUGIN",

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.doc = "Disable a specific plugin", .group = 1 },

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{ .name = "enable", .key = 'e',

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.arg = "PLUGIN",

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.doc = "Enable a specific plugin", .group = 1 },

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{ .name = "plugin-dir", .key = 128,

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.arg = "DIRECTORY",

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.doc = "Specify a different plugin directory", .group = 2 },

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{ .name = NULL }

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};

398

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

400

struct argp_state *state){

401

switch(key){

402

char *tmp;

403

intmax_t tmpmax;

359

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

360

struct argp_state *state) {

361

/* Get the INPUT argument from `argp_parse', which we know is a

362

pointer to our plugin list pointer. */

363

switch (key) {

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

405

if(arg != NULL){

406

char *plugin_option;

407

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

408

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

365

if (arg != NULL){

366

char *p;

367

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

368

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

409

369

continue;

410

370

}

411

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

371

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

412

372

perror("add_argument");

413

373

return ARGP_ERR_UNKNOWN;

414

374

}

415

375

}

416

376

}

417

377

break;

418

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

378

case 'e': /* --global-envs */

419

379

if(arg == NULL){

420

380

break;

421

381

}

422

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

423

perror("add_environment");

382

{

383

char *envdef = strdup(arg);

384

if(envdef == NULL){

385

break;

386

}

387

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

388

perror("add_environment");

389

}

424

390

}

425

391

break;

426

392

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

427

if(arg != NULL){

428

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

429

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

430

break;

431

}

432

char *plugin_option;

433

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

434

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

435

perror("add_argument");

436

return ARGP_ERR_UNKNOWN;

393

if (arg != NULL){

394

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

395

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

396

break;

397

}

398

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

399

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

400

break;

401

}

402

if(opt != NULL){

403

char *p;

404

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

405

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

406

continue;

407

}

408

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

409

perror("add_argument");

410

return ARGP_ERR_UNKNOWN;

411

}

437

412

}

438

413

}

439

414

}

440

415

break;

441

case 'E': /* --env-for */

416

case 'f': /* --envs-for */

442

417

if(arg == NULL){

443

418

break;

444

419

}

447

422

if(envdef == NULL){

448

423

break;

449

424

}

450

*envdef = '\0';

451

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

425

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

426

if(p_name == NULL){

427

break;

428

}

429

envdef++;

430

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

452

431

perror("add_environment");

453

432

}

454

433

}

455

434

break;

456

435

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

457

if(arg != NULL){

436

if (arg != NULL){

458

437

plugin *p = getplugin(arg);

459

438

if(p == NULL){

460

439

return ARGP_ERR_UNKNOWN;

462

441

p->disabled = true;

463

442

}

464

443

break;

465

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

466

if(arg != NULL){

467

plugin *p = getplugin(arg);

468

if(p == NULL){

469

return ARGP_ERR_UNKNOWN;

470

}

471

p->disabled = false;

472

}

473

break;

474

444

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

475

free(plugindir);

476

445

plugindir = strdup(arg);

477

446

if(plugindir == NULL){

478

447

perror("strdup");

479

}

480

break;

481

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

482

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

483

break;

484

case 130: /* --userid */

485

errno = 0;

486

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

487

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

488

or tmpmax != (uid_t)tmpmax){

489

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

490

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

491

} else {

492

uid = (uid_t)tmpmax;

493

}

494

break;

495

case 131: /* --groupid */

496

errno = 0;

497

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

498

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

499

or tmpmax != (gid_t)tmpmax){

500

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

501

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

502

} else {

503

gid = (gid_t)tmpmax;

504

}

505

break;

506

case 132: /* --debug */

507

debug = true;

508

break;

509

/*

510

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

511

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

512

*/

513

case ARGP_KEY_ARG:

514

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

515

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

516

argument was empty, we ignore it silently. */

517

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

518

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

519

}

520

break;

521

case ARGP_KEY_END:

522

break;

523

default:

524

return ARGP_ERR_UNKNOWN;

525

}

526

return 0;

527

}

528

529

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

530

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

531

error_t parse_opt_config_file(int key, char *arg,

532

__attribute__((unused))

533

struct argp_state *state){

534

switch(key){

535

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

536

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

537

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

538

case 'E': /* --env-for */

539

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

540

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

541

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

542

break;

543

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

544

free(argfile);

448

}

449

break;

450

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

545

451

argfile = strdup(arg);

546

452

if(argfile == NULL){

547

453

perror("strdup");

548

454

}

549

break;

455

break;

550

456

case 130: /* --userid */

457

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

458

break;

551

459

case 131: /* --groupid */

460

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

461

break;

552

462

case 132: /* --debug */

463

debug = true;

464

break;

553

465

case ARGP_KEY_ARG:

466

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

467

break;

554

468

case ARGP_KEY_END:

555

469

break;

556

470

default:

559

473

return 0;

560

474

}

561

475

562

struct argp argp = { .options = options,

563

.parser = parse_opt_config_file,

564

.args_doc = "",

476

struct argp argp = { .options = options, .parser = parse_opt,

477

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

565

478

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

566

479

567

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

568

config file location, if any. */

569

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

570

if(ret == ARGP_ERR_UNKNOWN){

480

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

481

if (ret == ARGP_ERR_UNKNOWN){

571

482

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

572

483

exitstatus = EXIT_FAILURE;

573

484

goto fallback;

574

485

}

575

576

/* Reset to the normal argument parser */

577

argp.parser = parse_opt;

578

579

/* Open the configfile if available */

580

if(argfile == NULL){

486

487

/* Opens the configfile if aviable */

488

if (argfile == NULL){

581

489

conffp = fopen(AFILE, "r");

582

490

} else {

583

491

conffp = fopen(argfile, "r");

584

}

492

}

585

493

if(conffp != NULL){

586

494

char *org_line = NULL;

587

495

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

588

496

size_t size = 0;

497

ssize_t sret;

589

498

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

590

499

const char comment_delim[] = "#";

591

500

592

501

custom_argc = 1;

593

502

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

594

503

if(custom_argv == NULL){

598

507

}

599

508

custom_argv[0] = argv[0];

600

509

custom_argv[1] = NULL;

601

510

602

511

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

603

512

commented text */

604

513

while(true){

606

515

if(sret == -1){

607

516

break;

608

517

}

609

518

610

519

line = org_line;

611

520

arg = strsep(&line, comment_delim);

612

521

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

631

540

goto fallback;

632

541

}

633

542

custom_argv[custom_argc-1] = new_arg;

634

custom_argv[custom_argc] = NULL;

543

custom_argv[custom_argc] = NULL;

635

544

}

636

545

}

637

do {

638

ret = fclose(conffp);

639

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

640

if(ret == EOF){

641

perror("fclose");

642

exitstatus = EXIT_FAILURE;

643

goto fallback;

644

}

645

546

free(org_line);

646

} else {

547

} else{

647

548

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

648

549

not affect opening plugins */

649

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

550

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

650

551

perror("fopen");

651

552

exitstatus = EXIT_FAILURE;

652

553

goto fallback;

655

556

/* If there was any arguments from configuration file,

656

557

pass them to parser as command arguments */

657

558

if(custom_argv != NULL){

658

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

659

0, NULL);

660

if(ret == ARGP_ERR_UNKNOWN){

559

ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, NULL);

560

if (ret == ARGP_ERR_UNKNOWN){

661

561

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

662

562

exitstatus = EXIT_FAILURE;

663

563

goto fallback;

664

564

}

665

565

}

666

566

667

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

668

config file */

669

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

670

if(ret == ARGP_ERR_UNKNOWN){

671

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

672

exitstatus = EXIT_FAILURE;

673

goto fallback;

674

}

675

676

567

if(debug){

677

568

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

678

569

fprintf(stderr, "Plugin: %s has %d arguments\n",

680

571

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

681

572

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

682

573

}

683

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

574

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

684

575

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

685

576

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

686

577

}

687

578

}

688

579

}

689

580

690

581

/* Strip permissions down to nobody */

582

ret = setuid(uid);

583

if (ret == -1){

584

perror("setuid");

585

}

691

586

setgid(gid);

692

if(ret == -1){

587

if (ret == -1){

693

588

perror("setgid");

694

589

}

695

ret = setuid(uid);

696

if(ret == -1){

697

perror("setuid");

698

}

699

700

if(plugindir == NULL){

590

591

if (plugindir == NULL){

701

592

dir = opendir(PDIR);

702

593

} else {

703

594

dir = opendir(plugindir);

723

614

}

724

615

725

616

FD_ZERO(&rfds_all);

726

617

727

618

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

728

619

while(true){

729

do {

730

dirst = readdir(dir);

731

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

620

dirst = readdir(dir);

732

621

733

/* All directory entries have been processed */

622

// All directory entries have been processed

734

623

if(dirst == NULL){

735

if(errno == EBADF){

624

if (errno == EBADF){

736

625

perror("readdir");

737

626

exitstatus = EXIT_FAILURE;

738

627

goto fallback;

742

631

743

632

d_name_len = strlen(dirst->d_name);

744

633

745

/* Ignore dotfiles, backup files and other junk */

634

// Ignore dotfiles, backup files and other junk

746

635

{

747

636

bool bad_name = false;

748

637

750

639

751

640

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

752

641

".dpkg-old",

753

".dpkg-bak",

754

642

".dpkg-divert", NULL };

755

643

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

756

644

size_t pre_len = strlen(*pre);

785

673

continue;

786

674

}

787

675

}

788

676

789

677

char *filename;

790

if(plugindir == NULL){

791

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

792

dirst->d_name));

793

} else {

794

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

795

dirst->d_name));

796

}

678

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

797

679

if(ret < 0){

798

680

perror("asprintf");

799

681

continue;

800

682

}

801

683

802

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

803

if(ret == -1){

684

ret = stat(filename, &st);

685

if (ret == -1){

804

686

perror("stat");

805

687

free(filename);

806

688

continue;

807

689

}

808

690

809

691

/* Ignore non-executable files */

810

if(not S_ISREG(st.st_mode)

811

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

692

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

812

693

if(debug){

813

694

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

814

695

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

842

723

}

843

724

/* Add global environment variables */

844

725

for(char **e = g->environ; *e != NULL; e++){

845

if(not add_environment(p, *e, false)){

726

if(not add_environment(p, *e)){

846

727

perror("add_environment");

847

728

}

848

729

}

853

734

process, too. */

854

735

if(p->environ[0] != NULL){

855

736

for(char **e = environ; *e != NULL; e++){

856

if(not add_environment(p, *e, false)){

737

char *copy = strdup(*e);

738

if(copy == NULL){

739

perror("strdup");

740

continue;

741

}

742

if(not add_environment(p, copy)){

857

743

perror("add_environment");

858

744

}

859

745

}

860

746

}

861

747

862

748

int pipefd[2];

863

ret = TEMP_FAILURE_RETRY(pipe(pipefd));

864

if(ret == -1){

749

ret = pipe(pipefd);

750

if (ret == -1){

865

751

perror("pipe");

866

752

exitstatus = EXIT_FAILURE;

867

753

goto fallback;

880

766

goto fallback;

881

767

}

882

768

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

883

ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,

884

&sigchld_action.sa_mask,

885

NULL));

769

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

886

770

if(ret < 0){

887

771

perror("sigprocmask");

888

772

exitstatus = EXIT_FAILURE;

889

773

goto fallback;

890

774

}

891

/* Starting a new process to be watched */

892

pid_t pid;

893

do {

894

pid = fork();

895

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

775

// Starting a new process to be watched

776

pid_t pid = fork();

896

777

if(pid == -1){

897

778

perror("fork");

898

779

exitstatus = EXIT_FAILURE;

905

786

perror("sigaction");

906

787

_exit(EXIT_FAILURE);

907

788

}

908

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

789

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

909

790

if(ret < 0){

910

791

perror("sigprocmask");

911

792

_exit(EXIT_FAILURE);

912

793

}

913

794

914

795

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

915

796

if(ret == -1){

916

797

perror("dup2");

936

817

/* no return */

937

818

}

938

819

/* Parent process */

939

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

940

pipe */

820

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

941

821

free(filename);

942

822

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

943

if(new_plugin == NULL){

823

if (new_plugin == NULL){

944

824

perror("getplugin");

945

ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,

946

&sigchld_action.sa_mask,

947

NULL));

825

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

948

826

if(ret < 0){

949

827

perror("sigprocmask");

950

828

}

957

835

958

836

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

959

837

has already completed */

960

ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,

961

&sigchld_action.sa_mask,

962

NULL));

838

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

963

839

if(ret < 0){

964

840

perror("sigprocmask");

965

841

exitstatus = EXIT_FAILURE;

968

844

969

845

FD_SET(new_plugin->fd, &rfds_all);

970

846

971

if(maxfd < new_plugin->fd){

847

if (maxfd < new_plugin->fd){

972

848

maxfd = new_plugin->fd;

973

849

}

850

974

851

}

975

852

976

TEMP_FAILURE_RETRY(closedir(dir));

853

closedir(dir);

977

854

dir = NULL;

978

free_plugin(getplugin(NULL));

979

855

980

856

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

981

857

if(p->pid != 0){

982

858

break;

987

863

free_plugin_list();

988

864

}

989

865

}

990

866

991

867

/* Main loop while running plugins exist */

992

868

while(plugin_list){

993

869

fd_set rfds = rfds_all;

994

870

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

995

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

871

if (select_ret == -1){

996

872

perror("select");

997

873

exitstatus = EXIT_FAILURE;

998

874

goto fallback;

999

875

}

1000

876

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

1001

877

from one of them */

1002

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

878

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

1003

879

/* Is this process completely done? */

1004

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

880

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

1005

881

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

1006

882

if(not WIFEXITED(proc->status)

1007

883

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

1008

884

/* Bad exit by plugin */

1009

885

1010

886

if(debug){

1011

887

if(WIFEXITED(proc->status)){

1012

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

1013

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

1014

(intmax_t) (proc->pid),

888

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

889

(unsigned int) (proc->pid),

1015

890

WEXITSTATUS(proc->status));

1016

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

1017

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

1018

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

1019

(intmax_t) (proc->pid),

1020

WTERMSIG(proc->status),

1021

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

891

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

892

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

893

(unsigned int) (proc->pid),

894

WTERMSIG(proc->status));

1022

895

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

1023

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

1024

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

896

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

897

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

1025

898

}

1026

899

}

1027

900

1028

901

/* Remove the plugin */

1029

902

FD_CLR(proc->fd, &rfds_all);

1030

903

1031

904

/* Block signal while modifying process_list */

1032

ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,

1033

&sigchld_action.sa_mask,

1034

NULL));

905

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

1035

906

if(ret < 0){

1036

907

perror("sigprocmask");

1037

908

exitstatus = EXIT_FAILURE;

1038

909

goto fallback;

1039

910

}

1040

1041

plugin *next_plugin = proc->next;

1042

911

free_plugin(proc);

1043

proc = next_plugin;

1044

1045

912

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

1046

ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,

1047

&sigchld_action.sa_mask,

1048

NULL));

913

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

914

NULL);

1049

915

if(ret < 0){

1050

916

perror("sigprocmask");

1051

917

exitstatus = EXIT_FAILURE;

1055

921

if(plugin_list == NULL){

1056

922

break;

1057

923

}

1058

1059

924

continue;

1060

925

}

1061

926

1062

927

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

1063

928

1064

929

bool bret = print_out_password(proc->buffer,

1065

930

proc->buffer_length);

1066

931

if(not bret){

1073

938

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

1074

939

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

1075

940

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

1076

proc = proc->next;

1077

941

continue;

1078

942

}

1079

943

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

1080

944

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

1081

945

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

1082

946

+ (size_t) BUFFER_SIZE);

1083

if(proc->buffer == NULL){

947

if (proc->buffer == NULL){

1084

948

perror("malloc");

1085

949

exitstatus = EXIT_FAILURE;

1086

950

goto fallback;

1088

952

proc->buffer_size += BUFFER_SIZE;

1089

953

}

1090

954

/* Read from the process */

1091

sret = TEMP_FAILURE_RETRY(read(proc->fd,

1092

proc->buffer

1093

+ proc->buffer_length,

1094

BUFFER_SIZE));

1095

if(sret < 0){

955

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

956

BUFFER_SIZE);

957

if(ret < 0){

1096

958

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

1097

proc = proc->next;

1098

959

continue;

1099

960

}

1100

if(sret == 0){

961

if(ret == 0){

1101

962

/* got EOF */

1102

963

proc->eof = true;

1103

964

} else {

1104

proc->buffer_length += (size_t) sret;

965

proc->buffer_length += (size_t) ret;

1105

966

}

1106

967

}

1107

968

}

1108

1109

969

970

1110

971

fallback:

1111

972

1112

973

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

1115

976

bool bret;

1116

977

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

1117

978

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

1118

size_t len = strlen(passwordbuffer);

1119

/* Strip trailing newline */

1120

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

1121

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

1122

len--;

1123

}

1124

bret = print_out_password(passwordbuffer, len);

979

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

1125

980

if(not bret){

1126

981

perror("print_out_password");

1127

982

exitstatus = EXIT_FAILURE;

1134

989

perror("sigaction");

1135

990

exitstatus = EXIT_FAILURE;

1136

991

}

1137

992

1138

993

if(custom_argv != NULL){

1139

994

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

1140

995

free(*arg);

1146

1001

closedir(dir);

1147

1002

}

1148

1003

1149

/* Kill the processes */

1004

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

1150

1005

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

1151

1006

if(p->pid != 0){

1152

1007

close(p->fd);

1159

1014

}

1160

1015

1161

1016

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

1162

do {

1017

do{

1163

1018

ret = wait(NULL);

1164

1019

} while(ret >= 0);

1165

1020

if(errno != ECHILD){

1166

1021

perror("wait");

1167

1022

}

1168

1023

1169

1024

free_plugin_list();

1170

1025

1171

1026

free(plugindir);