/mandos/trunk : revision 132

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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 = (int)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 (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,

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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. */

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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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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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};

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358

400

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

401

struct argp_state *state){

402

switch(key){

403

char *tmp;

404

intmax_t tmpmax;

359

error_t parse_opt (int key, char *arg, __attribute__((unused)) struct argp_state *state) {

360

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

361

pointer to our plugin list pointer. */

362

switch (key) {

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363

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

406

if(arg != NULL){

407

char *plugin_option;

408

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

409

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

364

if (arg != NULL){

365

char *p;

366

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

367

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

410

368

continue;

411

369

}

412

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

370

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

413

371

perror("add_argument");

414

372

return ARGP_ERR_UNKNOWN;

415

373

}

416

374

}

417

375

}

418

376

break;

419

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

377

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

420

378

if(arg == NULL){

421

379

break;

422

380

}

423

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

424

perror("add_environment");

381

{

382

char *envdef = strdup(arg);

383

if(envdef == NULL){

384

break;

385

}

386

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

387

perror("add_environment");

388

}

425

389

}

426

390

break;

427

391

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

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)){

436

perror("add_argument");

437

return ARGP_ERR_UNKNOWN;

392

if (arg != NULL){

393

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

394

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

395

break;

396

}

397

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

398

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

399

break;

400

}

401

if(opt != NULL){

402

char *p;

403

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

404

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

405

continue;

406

}

407

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

408

perror("add_argument");

409

return ARGP_ERR_UNKNOWN;

410

}

438

411

}

439

412

}

440

413

}

441

414

break;

442

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

415

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

443

416

if(arg == NULL){

444

417

break;

445

418

}

448

421

if(envdef == NULL){

449

422

break;

450

423

}

451

*envdef = '\0';

452

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

424

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

425

if(p_name == NULL){

426

break;

427

}

428

envdef++;

429

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

453

430

perror("add_environment");

454

431

}

455

432

}

456

433

break;

457

434

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

458

if(arg != NULL){

435

if (arg != NULL){

459

436

plugin *p = getplugin(arg);

460

437

if(p == NULL){

461

438

return ARGP_ERR_UNKNOWN;

463

440

p->disabled = true;

464

441

}

465

442

break;

466

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

467

if(arg != NULL){

468

plugin *p = getplugin(arg);

469

if(p == NULL){

470

return ARGP_ERR_UNKNOWN;

471

}

472

p->disabled = false;

473

}

474

break;

475

443

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

476

free(plugindir);

477

444

plugindir = strdup(arg);

478

445

if(plugindir == NULL){

479

446

perror("strdup");

480

}

481

break;

482

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

483

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

484

break;

485

case 130: /* --userid */

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

}

495

break;

496

case 131: /* --groupid */

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

}

506

break;

507

case 132: /* --debug */

508

debug = true;

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

*/

514

case ARGP_KEY_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

}

521

break;

522

case ARGP_KEY_END:

523

break;

524

default:

525

return ARGP_ERR_UNKNOWN;

526

}

527

return 0;

528

}

529

530

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

531

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

532

error_t parse_opt_config_file(int key, char *arg,

533

__attribute__((unused))

534

struct argp_state *state){

535

switch(key){

536

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

537

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

538

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

539

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

540

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

541

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

542

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

543

break;

544

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

545

free(argfile);

447

}

448

break;

449

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

546

450

argfile = strdup(arg);

547

451

if(argfile == NULL){

548

452

perror("strdup");

549

453

}

550

break;

454

break;

551

455

case 130: /* --userid */

456

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

457

break;

552

458

case 131: /* --groupid */

459

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

460

break;

553

461

case 132: /* --debug */

462

debug = true;

463

break;

554

464

case ARGP_KEY_ARG:

465

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

466

break;

555

467

case ARGP_KEY_END:

556

468

break;

557

469

default:

560

472

return 0;

561

473

}

562

474

563

struct argp argp = { .options = options,

564

.parser = parse_opt_config_file,

565

.args_doc = "",

475

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

476

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

566

477

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

567

478

568

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

569

config file location, if any. */

570

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

571

if(ret == ARGP_ERR_UNKNOWN){

479

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

480

if (ret == ARGP_ERR_UNKNOWN){

572

481

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

573

482

exitstatus = EXIT_FAILURE;

574

483

goto fallback;

575

484

}

576

577

/* Reset to the normal argument parser */

578

argp.parser = parse_opt;

579

580

/* Open the configfile if available */

581

if(argfile == NULL){

485

486

/* Opens the configfile if aviable */

487

if (argfile == NULL){

582

488

conffp = fopen(AFILE, "r");

583

489

} else {

584

490

conffp = fopen(argfile, "r");

585

}

491

}

586

492

if(conffp != NULL){

587

493

char *org_line = NULL;

588

494

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

589

495

size_t size = 0;

496

ssize_t sret;

590

497

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

591

498

const char comment_delim[] = "#";

592

499

593

500

custom_argc = 1;

594

501

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

595

502

if(custom_argv == NULL){

599

506

}

600

507

custom_argv[0] = argv[0];

601

508

custom_argv[1] = NULL;

602

603

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

604

commented text */

509

510

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

605

511

while(true){

606

512

sret = getline(&org_line, &size, conffp);

607

513

if(sret == -1){

608

514

break;

609

515

}

610

516

611

517

line = org_line;

612

518

arg = strsep(&line, comment_delim);

613

519

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

632

538

goto fallback;

633

539

}

634

540

custom_argv[custom_argc-1] = new_arg;

635

custom_argv[custom_argc] = NULL;

541

custom_argv[custom_argc] = NULL;

636

542

}

637

543

}

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

}

646

544

free(org_line);

647

} else {

545

} else{

648

546

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

649

547

not affect opening plugins */

650

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

548

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

651

549

perror("fopen");

652

550

exitstatus = EXIT_FAILURE;

653

551

goto fallback;

656

554

/* If there was any arguments from configuration file,

657

555

pass them to parser as command arguments */

658

556

if(custom_argv != NULL){

659

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

660

0, NULL);

661

if(ret == ARGP_ERR_UNKNOWN){

557

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

558

if (ret == ARGP_ERR_UNKNOWN){

662

559

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

663

560

exitstatus = EXIT_FAILURE;

664

561

goto fallback;

665

562

}

666

563

}

667

564

668

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

669

config file */

670

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

671

if(ret == ARGP_ERR_UNKNOWN){

672

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

673

exitstatus = EXIT_FAILURE;

674

goto fallback;

675

}

676

677

565

if(debug){

678

566

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

679

567

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

681

569

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

682

570

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

683

571

}

684

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

572

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

685

573

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

686

574

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

687

575

}

688

576

}

689

577

}

690

578

691

579

/* Strip permissions down to nobody */

580

ret = setuid(uid);

581

if (ret == -1){

582

perror("setuid");

583

}

692

584

setgid(gid);

693

if(ret == -1){

585

if (ret == -1){

694

586

perror("setgid");

695

587

}

696

ret = setuid(uid);

697

if(ret == -1){

698

perror("setuid");

699

}

700

701

if(plugindir == NULL){

588

589

if (plugindir == NULL){

702

590

dir = opendir(PDIR);

703

591

} else {

704

592

dir = opendir(plugindir);

724

612

}

725

613

726

614

FD_ZERO(&rfds_all);

727

615

728

616

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

729

617

while(true){

730

do {

731

dirst = readdir(dir);

732

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

618

dirst = readdir(dir);

733

619

734

/* All directory entries have been processed */

620

// All directory entries have been processed

735

621

if(dirst == NULL){

736

if(errno == EBADF){

622

if (errno == EBADF){

737

623

perror("readdir");

738

624

exitstatus = EXIT_FAILURE;

739

625

goto fallback;

743

629

744

630

d_name_len = strlen(dirst->d_name);

745

631

746

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

632

// Ignore dotfiles, backup files and other junk

747

633

{

748

634

bool bad_name = false;

749

635

751

637

752

638

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

753

639

".dpkg-old",

754

".dpkg-bak",

755

640

".dpkg-divert", NULL };

756

641

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

757

642

size_t pre_len = strlen(*pre);

786

671

continue;

787

672

}

788

673

}

789

674

790

675

char *filename;

791

if(plugindir == NULL){

792

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

793

dirst->d_name));

794

} else {

795

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

796

plugindir,

797

dirst->d_name));

798

}

676

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

799

677

if(ret < 0){

800

678

perror("asprintf");

801

679

continue;

802

680

}

803

681

804

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

805

if(ret == -1){

682

ret = stat(filename, &st);

683

if (ret == -1){

806

684

perror("stat");

807

685

free(filename);

808

686

continue;

809

687

}

810

688

811

689

/* Ignore non-executable files */

812

if(not S_ISREG(st.st_mode)

813

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

690

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

814

691

if(debug){

815

692

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

816

693

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

844

721

}

845

722

/* Add global environment variables */

846

723

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

847

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

724

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

848

725

perror("add_environment");

849

726

}

850

727

}

855

732

process, too. */

856

733

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

857

734

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

858

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

735

char *copy = strdup(*e);

736

if(copy == NULL){

737

perror("strdup");

738

continue;

739

}

740

if(not add_environment(p, copy)){

859

741

perror("add_environment");

860

742

}

861

743

}

862

744

}

863

745

864

746

int pipefd[2];

865

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

866

if(ret == -1){

747

ret = pipe(pipefd);

748

if (ret == -1){

867

749

perror("pipe");

868

750

exitstatus = EXIT_FAILURE;

869

751

goto fallback;

882

764

goto fallback;

883

765

}

884

766

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

885

ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,

886

&sigchld_action.sa_mask,

887

NULL));

767

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

888

768

if(ret < 0){

889

769

perror("sigprocmask");

890

770

exitstatus = EXIT_FAILURE;

891

771

goto fallback;

892

772

}

893

/* Starting a new process to be watched */

894

pid_t pid;

895

do {

896

pid = fork();

897

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

773

// Starting a new process to be watched

774

pid_t pid = fork();

898

775

if(pid == -1){

899

776

perror("fork");

900

777

exitstatus = EXIT_FAILURE;

907

784

perror("sigaction");

908

785

_exit(EXIT_FAILURE);

909

786

}

910

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

787

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

911

788

if(ret < 0){

912

789

perror("sigprocmask");

913

790

_exit(EXIT_FAILURE);

914

791

}

915

792

916

793

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

917

794

if(ret == -1){

918

795

perror("dup2");

938

815

/* no return */

939

816

}

940

817

/* Parent process */

941

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

942

pipe */

818

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

943

819

free(filename);

944

820

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

945

if(new_plugin == NULL){

821

if (new_plugin == NULL){

946

822

perror("getplugin");

947

ret = (int)(TEMP_FAILURE_RETRY

948

(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,

949

NULL)));

823

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

950

824

if(ret < 0){

951

825

perror("sigprocmask");

952

826

}

959

833

960

834

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

961

835

has already completed */

962

ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,

963

&sigchld_action.sa_mask,

964

NULL));

836

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

965

837

if(ret < 0){

966

838

perror("sigprocmask");

967

839

exitstatus = EXIT_FAILURE;

970

842

971

843

FD_SET(new_plugin->fd, &rfds_all);

972

844

973

if(maxfd < new_plugin->fd){

845

if (maxfd < new_plugin->fd){

974

846

maxfd = new_plugin->fd;

975

847

}

848

976

849

}

977

850

978

TEMP_FAILURE_RETRY(closedir(dir));

851

closedir(dir);

979

852

dir = NULL;

980

free_plugin(getplugin(NULL));

981

853

982

854

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

983

855

if(p->pid != 0){

984

856

break;

989

861

free_plugin_list();

990

862

}

991

863

}

992

864

993

865

/* Main loop while running plugins exist */

994

866

while(plugin_list){

995

867

fd_set rfds = rfds_all;

996

868

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

997

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

869

if (select_ret == -1){

998

870

perror("select");

999

871

exitstatus = EXIT_FAILURE;

1000

872

goto fallback;

1001

873

}

1002

874

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

1003

875

from one of them */

1004

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

876

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

1005

877

/* Is this process completely done? */

1006

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

878

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

1007

879

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

1008

880

if(not WIFEXITED(proc->status)

1009

881

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

1010

882

/* Bad exit by plugin */

1011

883

1012

884

if(debug){

1013

885

if(WIFEXITED(proc->status)){

1014

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

1015

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

1016

(intmax_t) (proc->pid),

886

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

887

(unsigned int) (proc->pid),

1017

888

WEXITSTATUS(proc->status));

1018

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

1019

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

1020

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

1021

(intmax_t) (proc->pid),

1022

WTERMSIG(proc->status),

1023

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

889

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

890

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

891

(unsigned int) (proc->pid),

892

WTERMSIG(proc->status));

1024

893

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

1025

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

1026

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

894

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

895

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

1027

896

}

1028

897

}

1029

898

1030

899

/* Remove the plugin */

1031

900

FD_CLR(proc->fd, &rfds_all);

1032

901

1033

902

/* Block signal while modifying process_list */

1034

ret = (int)TEMP_FAILURE_RETRY(sigprocmask

1035

(SIG_BLOCK,

1036

&sigchld_action.sa_mask,

1037

NULL));

903

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

1038

904

if(ret < 0){

1039

905

perror("sigprocmask");

1040

906

exitstatus = EXIT_FAILURE;

1041

907

goto fallback;

1042

908

}

1043

1044

plugin *next_plugin = proc->next;

1045

909

free_plugin(proc);

1046

proc = next_plugin;

1047

1048

910

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

1049

ret = (int)(TEMP_FAILURE_RETRY

1050

(sigprocmask(SIG_UNBLOCK,

1051

&sigchld_action.sa_mask, NULL)));

911

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

912

NULL);

1052

913

if(ret < 0){

1053

914

perror("sigprocmask");

1054

915

exitstatus = EXIT_FAILURE;

1058

919

if(plugin_list == NULL){

1059

920

break;

1060

921

}

1061

1062

922

continue;

1063

923

}

1064

924

1065

925

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

1066

926

1067

927

bool bret = print_out_password(proc->buffer,

1068

928

proc->buffer_length);

1069

929

if(not bret){

1076

936

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

1077

937

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

1078

938

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

1079

proc = proc->next;

1080

939

continue;

1081

940

}

1082

941

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

1083

942

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

1084

943

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

1085

944

+ (size_t) BUFFER_SIZE);

1086

if(proc->buffer == NULL){

945

if (proc->buffer == NULL){

1087

946

perror("malloc");

1088

947

exitstatus = EXIT_FAILURE;

1089

948

goto fallback;

1091

950

proc->buffer_size += BUFFER_SIZE;

1092

951

}

1093

952

/* Read from the process */

1094

sret = TEMP_FAILURE_RETRY(read(proc->fd,

1095

proc->buffer

1096

+ proc->buffer_length,

1097

BUFFER_SIZE));

1098

if(sret < 0){

953

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

954

BUFFER_SIZE);

955

if(ret < 0){

1099

956

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

1100

proc = proc->next;

1101

957

continue;

1102

958

}

1103

if(sret == 0){

959

if(ret == 0){

1104

960

/* got EOF */

1105

961

proc->eof = true;

1106

962

} else {

1107

proc->buffer_length += (size_t) sret;

963

proc->buffer_length += (size_t) ret;

1108

964

}

1109

965

}

1110

966

}

1111

1112

967

968

1113

969

fallback:

1114

970

1115

971

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

1118

974

bool bret;

1119

975

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

1120

976

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

1121

size_t len = strlen(passwordbuffer);

1122

/* Strip trailing newline */

1123

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

1124

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

1125

len--;

1126

}

1127

bret = print_out_password(passwordbuffer, len);

977

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

1128

978

if(not bret){

1129

979

perror("print_out_password");

1130

980

exitstatus = EXIT_FAILURE;

1137

987

perror("sigaction");

1138

988

exitstatus = EXIT_FAILURE;

1139

989

}

1140

990

1141

991

if(custom_argv != NULL){

1142

992

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

1143

993

free(*arg);

1149

999

closedir(dir);

1150

1000

}

1151

1001

1152

/* Kill the processes */

1002

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

1153

1003

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

1154

1004

if(p->pid != 0){

1155

1005

close(p->fd);

1162

1012

}

1163

1013

1164

1014

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

1165

do {

1015

do{

1166

1016

ret = wait(NULL);

1167

1017

} while(ret >= 0);

1168

1018

if(errno != ECHILD){

1169

1019

perror("wait");

1170

1020

}

1171

1021

1172

1022

free_plugin_list();

1173

1023

1174

1024

free(plugindir);