/mandos/trunk : revision 173

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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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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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*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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126

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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->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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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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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 */

167

do {

168

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

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

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

154

*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){

173

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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;

177

do {

178

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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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;

212

do {

213

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

214

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

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

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if(new == NULL){

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return false;

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}

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/*

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

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* Descriptor Flags".

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

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

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*/

232

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)

212

{

213

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

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/* If reading the flags failed, return error indication now. */

235

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if(ret < 0){

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return ret;

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}

238

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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));

219

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){

246

int old_errno = errno;

225

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

247

226

while(true){

248

227

plugin *proc = plugin_list;

249

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int status;

253

232

break;

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233

}

255

234

if(pid == -1){

256

if(errno == ECHILD){

257

/* No child processes */

258

break;

235

if (errno != ECHILD){

236

perror("waitpid");

259

237

}

260

perror("waitpid");

238

/* No child processes */

239

break;

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240

}

262

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

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continue;

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}

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proc->status = status;

272

proc->completed = 1;

251

proc->completed = true;

273

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}

274

errno = old_errno;

275

253

}

276

254

277

255

/* Prints out a password to stdout */

278

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

256

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

279

257

ssize_t ret;

280

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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,

299

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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 */

304

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if(plugin_node == plugin_list){

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/* First one - simple */

333

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struct stat st;

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fd_set rfds_all;

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int ret, maxfd = 0;

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ssize_t sret;

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uid_t uid = 65534;

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gid_t gid = 65534;

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bool debug = false;

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{ .name = NULL }

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};

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375

399

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

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struct argp_state *state){

401

switch(key){

402

char *tmp;

403

intmax_t tmpmax;

376

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

377

struct argp_state *state) {

378

switch (key) {

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

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if(arg != NULL){

406

char *plugin_option;

407

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

408

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

380

if (arg != NULL){

381

char *p;

382

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

383

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

409

384

continue;

410

385

}

411

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

386

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

412

387

perror("add_argument");

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return ARGP_ERR_UNKNOWN;

414

389

}

419

394

if(arg == NULL){

420

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break;

421

396

}

422

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

423

perror("add_environment");

397

{

398

char *envdef = strdup(arg);

399

if(envdef == NULL){

400

break;

401

}

402

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

403

perror("add_environment");

404

}

424

405

}

425

406

break;

426

407

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)){

408

if (arg != NULL){

409

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

410

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

411

break;

412

}

413

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

414

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

415

break;

416

}

417

char *p;

418

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

419

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

420

continue;

421

}

422

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

435

423

perror("add_argument");

436

424

return ARGP_ERR_UNKNOWN;

437

425

}

447

435

if(envdef == NULL){

448

436

break;

449

437

}

450

*envdef = '\0';

451

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

438

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

439

if(p_name == NULL){

440

break;

441

}

442

envdef++;

443

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

452

444

perror("add_environment");

453

445

}

454

446

}

455

447

break;

456

448

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

457

if(arg != NULL){

449

if (arg != NULL){

458

450

plugin *p = getplugin(arg);

459

451

if(p == NULL){

460

452

return ARGP_ERR_UNKNOWN;

463

455

}

464

456

break;

465

457

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

466

if(arg != NULL){

458

if (arg != NULL){

467

459

plugin *p = getplugin(arg);

468

460

if(p == NULL){

469

461

return ARGP_ERR_UNKNOWN;

472

464

}

473

465

break;

474

466

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

475

free(plugindir);

476

467

plugindir = strdup(arg);

477

468

if(plugindir == NULL){

478

469

perror("strdup");

479

}

470

}

480

471

break;

481

472

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

482

473

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

483

474

break;

484

475

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

}

476

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

494

477

break;

495

478

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

}

479

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

505

480

break;

506

481

case 132: /* --debug */

507

482

debug = true;

508

483

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

484

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

}

485

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

520

486

break;

521

487

case ARGP_KEY_END:

522

488

break;

528

494

529

495

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

530

496

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){

497

error_t parse_opt_config_file (int key, char *arg,

498

__attribute__((unused))

499

struct argp_state *state) {

500

switch (key) {

535

501

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

536

502

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

537

503

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

541

507

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

542

508

break;

543

509

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

544

free(argfile);

545

510

argfile = strdup(arg);

546

511

if(argfile == NULL){

547

512

perror("strdup");

548

513

}

549

break;

514

break;

550

515

case 130: /* --userid */

551

516

case 131: /* --groupid */

552

517

case 132: /* --debug */

564

529

.args_doc = "",

565

530

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

566

531

567

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

532

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

568

533

config file location, if any. */

569

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

570

if(ret == ARGP_ERR_UNKNOWN){

534

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

535

if (ret == ARGP_ERR_UNKNOWN){

571

536

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

572

537

exitstatus = EXIT_FAILURE;

573

538

goto fallback;

577

542

argp.parser = parse_opt;

578

543

579

544

/* Open the configfile if available */

580

if(argfile == NULL){

545

if (argfile == NULL){

581

546

conffp = fopen(AFILE, "r");

582

547

} else {

583

548

conffp = fopen(argfile, "r");

584

}

549

}

585

550

if(conffp != NULL){

586

551

char *org_line = NULL;

587

552

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

588

553

size_t size = 0;

554

ssize_t sret;

589

555

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

590

556

const char comment_delim[] = "#";

591

557

592

558

custom_argc = 1;

593

559

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

594

560

if(custom_argv == NULL){

598

564

}

599

565

custom_argv[0] = argv[0];

600

566

custom_argv[1] = NULL;

601

567

602

568

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

603

569

commented text */

604

570

while(true){

606

572

if(sret == -1){

607

573

break;

608

574

}

609

575

610

576

line = org_line;

611

577

arg = strsep(&line, comment_delim);

612

578

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

631

597

goto fallback;

632

598

}

633

599

custom_argv[custom_argc-1] = new_arg;

634

custom_argv[custom_argc] = NULL;

600

custom_argv[custom_argc] = NULL;

635

601

}

636

602

}

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

603

free(org_line);

646

604

} else {

647

605

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

648

606

not affect opening plugins */

649

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

607

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

650

608

perror("fopen");

651

609

exitstatus = EXIT_FAILURE;

652

610

goto fallback;

655

613

/* If there was any arguments from configuration file,

656

614

pass them to parser as command arguments */

657

615

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){

616

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

617

0, NULL);

618

if (ret == ARGP_ERR_UNKNOWN){

661

619

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

662

620

exitstatus = EXIT_FAILURE;

663

621

goto fallback;

666

624

667

625

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

668

626

config file */

669

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

670

if(ret == ARGP_ERR_UNKNOWN){

627

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

628

if (ret == ARGP_ERR_UNKNOWN){

671

629

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

672

630

exitstatus = EXIT_FAILURE;

673

631

goto fallback;

680

638

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

681

639

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

682

640

}

683

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

641

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

684

642

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

685

643

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

686

644

}

688

646

}

689

647

690

648

/* Strip permissions down to nobody */

649

ret = setuid(uid);

650

if (ret == -1){

651

perror("setuid");

652

}

691

653

setgid(gid);

692

if(ret == -1){

654

if (ret == -1){

693

655

perror("setgid");

694

656

}

695

ret = setuid(uid);

696

if(ret == -1){

697

perror("setuid");

698

}

699

657

700

if(plugindir == NULL){

658

if (plugindir == NULL){

701

659

dir = opendir(PDIR);

702

660

} else {

703

661

dir = opendir(plugindir);

726

684

727

685

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

728

686

while(true){

729

do {

730

dirst = readdir(dir);

731

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

687

dirst = readdir(dir);

732

688

733

689

/* All directory entries have been processed */

734

690

if(dirst == NULL){

735

if(errno == EBADF){

691

if (errno == EBADF){

736

692

perror("readdir");

737

693

exitstatus = EXIT_FAILURE;

738

694

goto fallback;

750

706

751

707

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

752

708

".dpkg-old",

753

".dpkg-bak",

754

709

".dpkg-divert", NULL };

755

710

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

756

711

size_t pre_len = strlen(*pre);

785

740

continue;

786

741

}

787

742

}

788

743

789

744

char *filename;

790

745

if(plugindir == NULL){

791

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

792

dirst->d_name));

746

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

793

747

} else {

794

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

795

dirst->d_name));

748

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

796

749

}

797

750

if(ret < 0){

798

751

perror("asprintf");

799

752

continue;

800

753

}

801

754

802

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

803

if(ret == -1){

755

ret = stat(filename, &st);

756

if (ret == -1){

804

757

perror("stat");

805

758

free(filename);

806

759

continue;

807

760

}

808

761

809

762

/* Ignore non-executable files */

810

if(not S_ISREG(st.st_mode)

811

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

763

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

812

764

if(debug){

813

765

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

814

766

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

860

812

}

861

813

862

814

int pipefd[2];

863

ret = TEMP_FAILURE_RETRY(pipe(pipefd));

864

if(ret == -1){

815

ret = pipe(pipefd);

816

if (ret == -1){

865

817

perror("pipe");

866

818

exitstatus = EXIT_FAILURE;

867

819

goto fallback;

880

832

goto fallback;

881

833

}

882

834

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

883

ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,

884

&sigchld_action.sa_mask,

885

NULL));

835

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

886

836

if(ret < 0){

887

837

perror("sigprocmask");

888

838

exitstatus = EXIT_FAILURE;

889

839

goto fallback;

890

840

}

891

841

/* Starting a new process to be watched */

892

pid_t pid;

893

do {

894

pid = fork();

895

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

842

pid_t pid = fork();

896

843

if(pid == -1){

897

844

perror("fork");

898

845

exitstatus = EXIT_FAILURE;

905

852

perror("sigaction");

906

853

_exit(EXIT_FAILURE);

907

854

}

908

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

855

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

909

856

if(ret < 0){

910

857

perror("sigprocmask");

911

858

_exit(EXIT_FAILURE);

912

859

}

913

860

914

861

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

915

862

if(ret == -1){

916

863

perror("dup2");

936

883

/* no return */

937

884

}

938

885

/* Parent process */

939

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

940

pipe */

886

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

941

887

free(filename);

942

888

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

943

if(new_plugin == NULL){

889

if (new_plugin == NULL){

944

890

perror("getplugin");

945

ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,

946

&sigchld_action.sa_mask,

947

NULL));

891

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

948

892

if(ret < 0){

949

893

perror("sigprocmask");

950

894

}

957

901

958

902

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

959

903

has already completed */

960

ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,

961

&sigchld_action.sa_mask,

962

NULL));

904

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

963

905

if(ret < 0){

964

906

perror("sigprocmask");

965

907

exitstatus = EXIT_FAILURE;

968

910

969

911

FD_SET(new_plugin->fd, &rfds_all);

970

912

971

if(maxfd < new_plugin->fd){

913

if (maxfd < new_plugin->fd){

972

914

maxfd = new_plugin->fd;

973

915

}

916

974

917

}

975

918

976

TEMP_FAILURE_RETRY(closedir(dir));

919

closedir(dir);

977

920

dir = NULL;

978

free_plugin(getplugin(NULL));

979

921

980

922

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

981

923

if(p->pid != 0){

982

924

break;

987

929

free_plugin_list();

988

930

}

989

931

}

990

932

991

933

/* Main loop while running plugins exist */

992

934

while(plugin_list){

993

935

fd_set rfds = rfds_all;

994

936

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

995

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

937

if (select_ret == -1){

996

938

perror("select");

997

939

exitstatus = EXIT_FAILURE;

998

940

goto fallback;

999

941

}

1000

942

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

1001

943

from one of them */

1002

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

944

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

1003

945

/* Is this process completely done? */

1004

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

946

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

1005

947

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

1006

948

if(not WIFEXITED(proc->status)

1007

949

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

1008

950

/* Bad exit by plugin */

1009

951

1010

952

if(debug){

1011

953

if(WIFEXITED(proc->status)){

1012

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

1013

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

1014

(intmax_t) (proc->pid),

954

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

955

(unsigned int) (proc->pid),

1015

956

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)));

957

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

958

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

959

(unsigned int) (proc->pid),

960

WTERMSIG(proc->status));

1022

961

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

1023

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

1024

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

962

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

963

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

1025

964

}

1026

965

}

1027

966

1028

967

/* Remove the plugin */

1029

968

FD_CLR(proc->fd, &rfds_all);

1030

969

1031

970

/* Block signal while modifying process_list */

1032

ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,

1033

&sigchld_action.sa_mask,

1034

NULL));

971

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

1035

972

if(ret < 0){

1036

973

perror("sigprocmask");

1037

974

exitstatus = EXIT_FAILURE;

1038

975

goto fallback;

1039

976

}

1040

1041

plugin *next_plugin = proc->next;

1042

977

free_plugin(proc);

1043

proc = next_plugin;

1044

1045

978

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

1046

ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,

1047

&sigchld_action.sa_mask,

1048

NULL));

979

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

980

NULL);

1049

981

if(ret < 0){

1050

982

perror("sigprocmask");

1051

983

exitstatus = EXIT_FAILURE;

1055

987

if(plugin_list == NULL){

1056

988

break;

1057

989

}

1058

1059

990

continue;

1060

991

}

1061

992

1062

993

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

1063

994

1064

995

bool bret = print_out_password(proc->buffer,

1065

996

proc->buffer_length);

1066

997

if(not bret){

1073

1004

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

1074

1005

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

1075

1006

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

1076

proc = proc->next;

1077

1007

continue;

1078

1008

}

1079

1009

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

1080

1010

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

1081

1011

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

1082

1012

+ (size_t) BUFFER_SIZE);

1083

if(proc->buffer == NULL){

1013

if (proc->buffer == NULL){

1084

1014

perror("malloc");

1085

1015

exitstatus = EXIT_FAILURE;

1086

1016

goto fallback;

1088

1018

proc->buffer_size += BUFFER_SIZE;

1089

1019

}

1090

1020

/* 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){

1021

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

1022

BUFFER_SIZE);

1023

if(ret < 0){

1096

1024

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

1097

proc = proc->next;

1098

1025

continue;

1099

1026

}

1100

if(sret == 0){

1027

if(ret == 0){

1101

1028

/* got EOF */

1102

1029

proc->eof = true;

1103

1030

} else {

1104

proc->buffer_length += (size_t) sret;

1031

proc->buffer_length += (size_t) ret;

1105

1032

}

1106

1033

}

1107

1034

}

1108

1109

1035

1036

1110

1037

fallback:

1111

1038

1112

1039

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

1134

1061

perror("sigaction");

1135

1062

exitstatus = EXIT_FAILURE;

1136

1063

}

1137

1064

1138

1065

if(custom_argv != NULL){

1139

1066

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

1140

1067

free(*arg);

1146

1073

closedir(dir);

1147

1074

}

1148

1075

1149

/* Kill the processes */

1076

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

1150

1077

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

1151

1078

if(p->pid != 0){

1152

1079

close(p->fd);

1159

1086

}

1160

1087

1161

1088

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

1162

do {

1089

do{

1163

1090

ret = wait(NULL);

1164

1091

} while(ret >= 0);

1165

1092

if(errno != ECHILD){

1166

1093

perror("wait");

1167

1094

}

1168

1095

1169

1096

free_plugin_list();

1170

1097

1171

1098

free(plugindir);