/mandos/trunk : revision 165

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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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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 {

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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);

154

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

155

* (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 {

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 {

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

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} 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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*/

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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)

212

{

213

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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}

238

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/* Store modified flag word in the descriptor. */

239

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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}

241

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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

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/* 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;

258

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

259

length--;

260

}

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,

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length - written));

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}

300

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free(plugin_node->environ);

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free(plugin_node->buffer);

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/* Removes the plugin from the singly-linked list */

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if(plugin_node == plugin_list){

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/* First one - simple */

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struct stat st;

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fd_set rfds_all;

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int ret, maxfd = 0;

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ssize_t sret;

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uid_t uid = 65534;

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gid_t gid = 65534;

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bool debug = false;

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{ .name = NULL }

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};

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

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struct argp_state *state){

401

switch(key){

402

char *tmp;

403

intmax_t tmpmax;

379

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

380

struct argp_state *state) {

381

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'){

383

if (arg != NULL){

384

char *p;

385

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

386

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

409

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continue;

410

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}

411

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

389

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

412

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perror("add_argument");

413

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return ARGP_ERR_UNKNOWN;

414

392

}

419

397

if(arg == NULL){

420

398

break;

421

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}

422

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

423

perror("add_environment");

400

{

401

char *envdef = strdup(arg);

402

if(envdef == NULL){

403

break;

404

}

405

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

406

perror("add_environment");

407

}

424

408

}

425

409

break;

426

410

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)){

411

if (arg != NULL){

412

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

413

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

414

break;

415

}

416

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

417

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

418

break;

419

}

420

char *p;

421

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

422

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

423

continue;

424

}

425

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

435

426

perror("add_argument");

436

427

return ARGP_ERR_UNKNOWN;

437

428

}

447

438

if(envdef == NULL){

448

439

break;

449

440

}

450

*envdef = '\0';

451

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

441

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

442

if(p_name == NULL){

443

break;

444

}

445

envdef++;

446

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

452

447

perror("add_environment");

453

448

}

454

449

}

455

450

break;

456

451

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

457

if(arg != NULL){

452

if (arg != NULL){

458

453

plugin *p = getplugin(arg);

459

454

if(p == NULL){

460

455

return ARGP_ERR_UNKNOWN;

463

458

}

464

459

break;

465

460

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

466

if(arg != NULL){

461

if (arg != NULL){

467

462

plugin *p = getplugin(arg);

468

463

if(p == NULL){

469

464

return ARGP_ERR_UNKNOWN;

472

467

}

473

468

break;

474

469

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

475

free(plugindir);

476

470

plugindir = strdup(arg);

477

471

if(plugindir == NULL){

478

472

perror("strdup");

479

}

473

}

480

474

break;

481

475

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

482

476

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

483

477

break;

484

478

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

}

479

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

494

480

break;

495

481

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

}

482

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

505

483

break;

506

484

case 132: /* --debug */

507

485

debug = true;

508

486

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

487

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

}

488

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

520

489

break;

521

490

case ARGP_KEY_END:

522

491

break;

528

497

529

498

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

530

499

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){

500

error_t parse_opt_config_file (int key, char *arg,

501

__attribute__((unused))

502

struct argp_state *state) {

503

switch (key) {

535

504

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

536

505

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

537

506

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

541

510

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

542

511

break;

543

512

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

544

free(argfile);

545

513

argfile = strdup(arg);

546

514

if(argfile == NULL){

547

515

perror("strdup");

548

516

}

549

break;

517

break;

550

518

case 130: /* --userid */

551

519

case 131: /* --groupid */

552

520

case 132: /* --debug */

564

532

.args_doc = "",

565

533

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

566

534

567

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

535

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

568

536

config file location, if any. */

569

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

570

if(ret == ARGP_ERR_UNKNOWN){

537

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

538

if (ret == ARGP_ERR_UNKNOWN){

571

539

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

572

540

exitstatus = EXIT_FAILURE;

573

541

goto fallback;

577

545

argp.parser = parse_opt;

578

546

579

547

/* Open the configfile if available */

580

if(argfile == NULL){

548

if (argfile == NULL){

581

549

conffp = fopen(AFILE, "r");

582

550

} else {

583

551

conffp = fopen(argfile, "r");

584

}

552

}

585

553

if(conffp != NULL){

586

554

char *org_line = NULL;

587

555

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

588

556

size_t size = 0;

557

ssize_t sret;

589

558

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

590

559

const char comment_delim[] = "#";

591

560

592

561

custom_argc = 1;

593

562

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

594

563

if(custom_argv == NULL){

598

567

}

599

568

custom_argv[0] = argv[0];

600

569

custom_argv[1] = NULL;

601

570

602

571

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

603

572

commented text */

604

573

while(true){

606

575

if(sret == -1){

607

576

break;

608

577

}

609

578

610

579

line = org_line;

611

580

arg = strsep(&line, comment_delim);

612

581

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

631

600

goto fallback;

632

601

}

633

602

custom_argv[custom_argc-1] = new_arg;

634

custom_argv[custom_argc] = NULL;

603

custom_argv[custom_argc] = NULL;

635

604

}

636

605

}

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

606

free(org_line);

646

607

} else {

647

608

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

648

609

not affect opening plugins */

649

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

610

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

650

611

perror("fopen");

651

612

exitstatus = EXIT_FAILURE;

652

613

goto fallback;

655

616

/* If there was any arguments from configuration file,

656

617

pass them to parser as command arguments */

657

618

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){

619

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

620

0, NULL);

621

if (ret == ARGP_ERR_UNKNOWN){

661

622

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

662

623

exitstatus = EXIT_FAILURE;

663

624

goto fallback;

666

627

667

628

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

668

629

config file */

669

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

670

if(ret == ARGP_ERR_UNKNOWN){

630

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

631

if (ret == ARGP_ERR_UNKNOWN){

671

632

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

672

633

exitstatus = EXIT_FAILURE;

673

634

goto fallback;

680

641

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

681

642

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

682

643

}

683

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

644

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

684

645

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

685

646

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

686

647

}

688

649

}

689

650

690

651

/* Strip permissions down to nobody */

652

ret = setuid(uid);

653

if (ret == -1){

654

perror("setuid");

655

}

691

656

setgid(gid);

692

if(ret == -1){

657

if (ret == -1){

693

658

perror("setgid");

694

659

}

695

ret = setuid(uid);

696

if(ret == -1){

697

perror("setuid");

698

}

699

660

700

if(plugindir == NULL){

661

if (plugindir == NULL){

701

662

dir = opendir(PDIR);

702

663

} else {

703

664

dir = opendir(plugindir);

726

687

727

688

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

728

689

while(true){

729

do {

730

dirst = readdir(dir);

731

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

690

dirst = readdir(dir);

732

691

733

692

/* All directory entries have been processed */

734

693

if(dirst == NULL){

735

if(errno == EBADF){

694

if (errno == EBADF){

736

695

perror("readdir");

737

696

exitstatus = EXIT_FAILURE;

738

697

goto fallback;

750

709

751

710

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

752

711

".dpkg-old",

753

".dpkg-bak",

754

712

".dpkg-divert", NULL };

755

713

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

756

714

size_t pre_len = strlen(*pre);

785

743

continue;

786

744

}

787

745

}

788

746

789

747

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

}

748

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

797

749

if(ret < 0){

798

750

perror("asprintf");

799

751

continue;

800

752

}

801

753

802

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

803

if(ret == -1){

754

ret = stat(filename, &st);

755

if (ret == -1){

804

756

perror("stat");

805

757

free(filename);

806

758

continue;

807

759

}

808

760

809

761

/* Ignore non-executable files */

810

if(not S_ISREG(st.st_mode)

811

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

762

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

812

763

if(debug){

813

764

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

814

765

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

860

811

}

861

812

862

813

int pipefd[2];

863

ret = TEMP_FAILURE_RETRY(pipe(pipefd));

864

if(ret == -1){

814

ret = pipe(pipefd);

815

if (ret == -1){

865

816

perror("pipe");

866

817

exitstatus = EXIT_FAILURE;

867

818

goto fallback;

880

831

goto fallback;

881

832

}

882

833

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

883

ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,

884

&sigchld_action.sa_mask,

885

NULL));

834

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

886

835

if(ret < 0){

887

836

perror("sigprocmask");

888

837

exitstatus = EXIT_FAILURE;

889

838

goto fallback;

890

839

}

891

840

/* Starting a new process to be watched */

892

pid_t pid;

893

do {

894

pid = fork();

895

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

841

pid_t pid = fork();

896

842

if(pid == -1){

897

843

perror("fork");

898

844

exitstatus = EXIT_FAILURE;

905

851

perror("sigaction");

906

852

_exit(EXIT_FAILURE);

907

853

}

908

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

854

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

909

855

if(ret < 0){

910

856

perror("sigprocmask");

911

857

_exit(EXIT_FAILURE);

912

858

}

913

859

914

860

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

915

861

if(ret == -1){

916

862

perror("dup2");

936

882

/* no return */

937

883

}

938

884

/* Parent process */

939

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

940

pipe */

885

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

941

886

free(filename);

942

887

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

943

if(new_plugin == NULL){

888

if (new_plugin == NULL){

944

889

perror("getplugin");

945

ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,

946

&sigchld_action.sa_mask,

947

NULL));

890

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

948

891

if(ret < 0){

949

892

perror("sigprocmask");

950

893

}

957

900

958

901

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

959

902

has already completed */

960

ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,

961

&sigchld_action.sa_mask,

962

NULL));

903

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

963

904

if(ret < 0){

964

905

perror("sigprocmask");

965

906

exitstatus = EXIT_FAILURE;

968

909

969

910

FD_SET(new_plugin->fd, &rfds_all);

970

911

971

if(maxfd < new_plugin->fd){

912

if (maxfd < new_plugin->fd){

972

913

maxfd = new_plugin->fd;

973

914

}

915

974

916

}

975

917

976

TEMP_FAILURE_RETRY(closedir(dir));

918

closedir(dir);

977

919

dir = NULL;

978

free_plugin(getplugin(NULL));

979

920

980

921

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

981

922

if(p->pid != 0){

982

923

break;

987

928

free_plugin_list();

988

929

}

989

930

}

990

931

991

932

/* Main loop while running plugins exist */

992

933

while(plugin_list){

993

934

fd_set rfds = rfds_all;

994

935

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

995

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

936

if (select_ret == -1){

996

937

perror("select");

997

938

exitstatus = EXIT_FAILURE;

998

939

goto fallback;

999

940

}

1000

941

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

1001

942

from one of them */

1002

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

943

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

1003

944

/* Is this process completely done? */

1004

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

945

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

1005

946

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

1006

947

if(not WIFEXITED(proc->status)

1007

948

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

1008

949

/* Bad exit by plugin */

1009

950

1010

951

if(debug){

1011

952

if(WIFEXITED(proc->status)){

1012

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

1013

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

1014

(intmax_t) (proc->pid),

953

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

954

(unsigned int) (proc->pid),

1015

955

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)));

956

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

957

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

958

(unsigned int) (proc->pid),

959

WTERMSIG(proc->status));

1022

960

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

1023

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

1024

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

961

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

962

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

1025

963

}

1026

964

}

1027

965

1028

966

/* Remove the plugin */

1029

967

FD_CLR(proc->fd, &rfds_all);

1030

968

1031

969

/* Block signal while modifying process_list */

1032

ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,

1033

&sigchld_action.sa_mask,

1034

NULL));

970

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

1035

971

if(ret < 0){

1036

972

perror("sigprocmask");

1037

973

exitstatus = EXIT_FAILURE;

1038

974

goto fallback;

1039

975

}

1040

1041

plugin *next_plugin = proc->next;

1042

976

free_plugin(proc);

1043

proc = next_plugin;

1044

1045

977

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

1046

ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,

1047

&sigchld_action.sa_mask,

1048

NULL));

978

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

979

NULL);

1049

980

if(ret < 0){

1050

981

perror("sigprocmask");

1051

982

exitstatus = EXIT_FAILURE;

1055

986

if(plugin_list == NULL){

1056

987

break;

1057

988

}

1058

1059

989

continue;

1060

990

}

1061

991

1062

992

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

1063

993

1064

994

bool bret = print_out_password(proc->buffer,

1065

995

proc->buffer_length);

1066

996

if(not bret){

1073

1003

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

1074

1004

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

1075

1005

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

1076

proc = proc->next;

1077

1006

continue;

1078

1007

}

1079

1008

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

1080

1009

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

1081

1010

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

1082

1011

+ (size_t) BUFFER_SIZE);

1083

if(proc->buffer == NULL){

1012

if (proc->buffer == NULL){

1084

1013

perror("malloc");

1085

1014

exitstatus = EXIT_FAILURE;

1086

1015

goto fallback;

1088

1017

proc->buffer_size += BUFFER_SIZE;

1089

1018

}

1090

1019

/* 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){

1020

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

1021

BUFFER_SIZE);

1022

if(ret < 0){

1096

1023

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

1097

proc = proc->next;

1098

1024

continue;

1099

1025

}

1100

if(sret == 0){

1026

if(ret == 0){

1101

1027

/* got EOF */

1102

1028

proc->eof = true;

1103

1029

} else {

1104

proc->buffer_length += (size_t) sret;

1030

proc->buffer_length += (size_t) ret;

1105

1031

}

1106

1032

}

1107

1033

}

1108

1109

1034

1035

1110

1036

fallback:

1111

1037

1112

1038

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

1115

1041

bool bret;

1116

1042

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

1117

1043

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);

1044

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

1125

1045

if(not bret){

1126

1046

perror("print_out_password");

1127

1047

exitstatus = EXIT_FAILURE;

1134

1054

perror("sigaction");

1135

1055

exitstatus = EXIT_FAILURE;

1136

1056

}

1137

1057

1138

1058

if(custom_argv != NULL){

1139

1059

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

1140

1060

free(*arg);

1146

1066

closedir(dir);

1147

1067

}

1148

1068

1149

/* Kill the processes */

1069

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

1150

1070

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

1151

1071

if(p->pid != 0){

1152

1072

close(p->fd);

1159

1079

}

1160

1080

1161

1081

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

1162

do {

1082

do{

1163

1083

ret = wait(NULL);

1164

1084

} while(ret >= 0);

1165

1085

if(errno != ECHILD){

1166

1086

perror("wait");

1167

1087

}

1168

1088

1169

1089

free_plugin_list();

1170

1090

1171

1091

free(plugindir);