1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
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* Mandos plugin runner - Run Mandos plugins
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* Copyright © 2008-2015 Teddy Hogeborn
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* Copyright © 2008-2015 Björn Påhlsson
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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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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see
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* <http://www.gnu.org/licenses/>.
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* Contact the authors at <mandos@recompile.se>.
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#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
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#include <stddef.h> /* size_t, NULL */
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#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
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#include <stdbool.h> /* bool, true, false */
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#include <stdio.h> /* fileno(), fprintf(),
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stderr, STDOUT_FILENO, fclose() */
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#include <sys/types.h> /* fstat(), struct stat, waitpid(),
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WIFEXITED(), WEXITSTATUS(), wait(),
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pid_t, uid_t, gid_t, getuid(),
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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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#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
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#include <iso646.h> /* and, or, not */
44
#include <dirent.h> /* struct dirent, scandirat() */
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#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
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FD_CLOEXEC, write(), STDOUT_FILENO,
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struct stat, fstat(), close(),
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setgid(), setuid(), S_ISREG(),
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faccessat() pipe2(), fork(),
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_exit(), dup2(), fexecve(), read()
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#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
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FD_CLOEXEC, openat(), scandirat(),
55
#include <string.h> /* strsep, strlen(), strsignal(),
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strcmp(), strncmp() */
57
#include <errno.h> /* errno */
58
#include <argp.h> /* struct argp_option, struct
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argp_state, struct argp,
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argp_parse(), ARGP_ERR_UNKNOWN,
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ARGP_KEY_END, ARGP_KEY_ARG,
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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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#include <errno.h> /* errno, EBADF */
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#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
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#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
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EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
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#define BUFFER_SIZE 256
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#define PDIR "/lib/mandos/plugins.d"
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#define PHDIR "/lib/mandos/plugin-helpers"
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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_bug_address = "<mandos@recompile.se>";
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typedef struct plugin{
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char *name; /* can be NULL or any plugin name */
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/* Variables used for running processes*/
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volatile sig_atomic_t completed;
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static plugin *plugin_list = NULL;
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/* Gets an existing plugin based on name,
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or if none is found, creates a new one */
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__attribute__((warn_unused_result))
110
static plugin *getplugin(char *name){
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/* Check for existing plugin with that name */
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for(plugin *p = plugin_list; p != NULL; p = p->next){
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or (p->name and name and (strcmp(p->name, name) == 0))){
118
/* Create a new plugin */
119
plugin *new_plugin = NULL;
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new_plugin = malloc(sizeof(plugin));
122
} while(new_plugin == NULL and errno == EINTR);
123
if(new_plugin == NULL){
126
char *copy_name = NULL;
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copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
131
if(copy_name == NULL){
139
*new_plugin = (plugin){ .name = copy_name,
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.next = plugin_list };
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new_plugin->argv = malloc(sizeof(char *) * 2);
146
} while(new_plugin->argv == NULL and errno == EINTR);
147
if(new_plugin->argv == NULL){
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new_plugin->argv[0] = copy_name;
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new_plugin->argv[1] = NULL;
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new_plugin->environ = malloc(sizeof(char *));
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} while(new_plugin->environ == NULL and errno == EINTR);
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if(new_plugin->environ == NULL){
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free(new_plugin->argv);
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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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/* Helper function for add_argument and add_environment */
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__attribute__((nonnull, warn_unused_result))
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static bool add_to_char_array(const char *new, char ***array,
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/* Resize the pointed-to array to hold one more pointer */
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char **new_array = NULL;
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new_array = realloc(*array, sizeof(char *)
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* (size_t) ((*len) + 2));
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} while(new_array == NULL and errno == EINTR);
186
if(new_array == NULL){
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/* Make a copy of the new string */
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} while(copy == NULL and errno == EINTR);
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/* Insert the copy */
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(*array)[*len] = copy;
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/* Add a new terminating NULL pointer to the last element */
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(*array)[*len] = NULL;
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/* Add to a plugin's argument vector */
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__attribute__((nonnull(2), warn_unused_result))
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static bool add_argument(plugin *p, const char *arg){
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return add_to_char_array(arg, &(p->argv), &(p->argc));
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/* Add to a plugin's environment */
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__attribute__((nonnull(2), warn_unused_result))
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static bool add_environment(plugin *p, const char *def, bool replace){
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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 **envdef = p->environ; *envdef != NULL; envdef++){
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if(strncmp(*envdef, def, namelen + 1) == 0){
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/* It already exists */
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new_envdef = realloc(*envdef, strlen(def) + 1);
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} while(new_envdef == NULL and errno == EINTR);
232
if(new_envdef == NULL){
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
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return add_to_char_array(def, &(p->environ), &(p->envc));
246
* Based on the example in the GNU LibC manual chapter 13.13 "File
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| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
250
__attribute__((warn_unused_result))
251
static int set_cloexec_flag(int fd){
252
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
253
/* If reading the flags failed, return error indication now. */
257
/* Store modified flag word in the descriptor. */
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
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#endif /* not O_CLOEXEC */
264
/* Mark processes as completed when they exit, and save their exit
266
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
269
plugin *proc = plugin_list;
271
pid_t pid = waitpid(-1, &status, WNOHANG);
273
/* Only still running child processes */
278
/* No child processes */
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error(0, errno, "waitpid");
284
/* A child exited, find it in process_list */
285
while(proc != NULL and proc->pid != pid){
289
/* Process not found in process list */
292
proc->status = status;
298
/* Prints out a password to stdout */
299
__attribute__((nonnull, warn_unused_result))
300
static bool print_out_password(const char *buffer, size_t length){
302
for(size_t written = 0; written < length; written += (size_t)ret){
303
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
312
/* Removes and free a plugin from the plugin list */
313
__attribute__((nonnull))
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static void free_plugin(plugin *plugin_node){
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for(char **arg = plugin_node->argv; *arg != NULL; arg++){
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free(plugin_node->argv);
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for(char **env = plugin_node->environ; *env != NULL; env++){
323
free(plugin_node->environ);
324
free(plugin_node->buffer);
326
/* Removes the plugin from the singly-linked list */
327
if(plugin_node == plugin_list){
328
/* First one - simple */
329
plugin_list = plugin_list->next;
331
/* Second one or later */
332
for(plugin *p = plugin_list; p != NULL; p = p->next){
333
if(p->next == plugin_node){
334
p->next = plugin_node->next;
343
static void free_plugin_list(void){
344
while(plugin_list != NULL){
345
free_plugin(plugin_list);
349
int main(int argc, char *argv[]){
350
char *plugindir = NULL;
351
char *pluginhelperdir = NULL;
352
char *argfile = NULL;
354
struct dirent **direntries = NULL;
362
int exitstatus = EXIT_SUCCESS;
363
struct sigaction old_sigchld_action;
364
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
365
.sa_flags = SA_NOCLDSTOP };
366
char **custom_argv = NULL;
370
/* Establish a signal handler */
371
sigemptyset(&sigchld_action.sa_mask);
372
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
374
error(0, errno, "sigaddset");
375
exitstatus = EX_OSERR;
378
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
380
error(0, errno, "sigaction");
381
exitstatus = EX_OSERR;
385
/* The options we understand. */
386
struct argp_option options[] = {
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{ .name = "global-options", .key = 'g',
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.arg = "OPTION[,OPTION[,...]]",
389
.doc = "Options passed to all plugins" },
390
{ .name = "global-env", .key = 'G',
392
.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" },
396
{ .name = "env-for", .key = 'E',
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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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.doc = "Disable a specific plugin", .group = 1 },
402
{ .name = "enable", .key = 'e',
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.doc = "Enable a specific plugin", .group = 1 },
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{ .name = "plugin-dir", .key = 128,
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.doc = "Specify a different plugin directory", .group = 2 },
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{ .name = "config-file", .key = 129,
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.doc = "Specify a different configuration file", .group = 2 },
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{ .name = "userid", .key = 130,
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.arg = "ID", .flags = 0,
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.doc = "User ID the plugins will run as", .group = 3 },
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{ .name = "groupid", .key = 131,
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.arg = "ID", .flags = 0,
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.doc = "Group ID the plugins will run as", .group = 3 },
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{ .name = "debug", .key = 132,
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.doc = "Debug mode", .group = 4 },
419
{ .name = "plugin-helper-dir", .key = 133,
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.doc = "Specify a different plugin helper directory",
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* These reproduce what we would get without ARGP_NO_HELP
426
{ .name = "help", .key = '?',
427
.doc = "Give this help list", .group = -1 },
428
{ .name = "usage", .key = -3,
429
.doc = "Give a short usage message", .group = -1 },
430
{ .name = "version", .key = 'V',
431
.doc = "Print program version", .group = -1 },
435
__attribute__((nonnull(3)))
436
error_t parse_opt(int key, char *arg, struct argp_state *state){
441
case 'g': /* --global-options */
444
while((plugin_option = strsep(&arg, ",")) != NULL){
445
if(not add_argument(getplugin(NULL), plugin_option)){
452
case 'G': /* --global-env */
453
if(add_environment(getplugin(NULL), arg, true)){
457
case 'o': /* --options-for */
459
char *option_list = strchr(arg, ':');
460
if(option_list == NULL){
461
argp_error(state, "No colon in \"%s\"", arg);
468
argp_error(state, "Empty plugin name");
473
while((option = strsep(&option_list, ",")) != NULL){
474
if(not add_argument(getplugin(arg), option)){
481
case 'E': /* --env-for */
483
char *envdef = strchr(arg, ':');
485
argp_error(state, "No colon in \"%s\"", arg);
492
argp_error(state, "Empty plugin name");
496
if(add_environment(getplugin(arg), envdef, true)){
501
case 'd': /* --disable */
503
plugin *p = getplugin(arg);
510
case 'e': /* --enable */
512
plugin *p = getplugin(arg);
519
case 128: /* --plugin-dir */
521
plugindir = strdup(arg);
522
if(plugindir != NULL){
526
case 129: /* --config-file */
527
/* This is already done by parse_opt_config_file() */
529
case 130: /* --userid */
530
tmp_id = strtoimax(arg, &tmp, 10);
531
if(errno != 0 or tmp == arg or *tmp != '\0'
532
or tmp_id != (uid_t)tmp_id){
533
argp_error(state, "Bad user ID number: \"%s\", using %"
534
PRIdMAX, arg, (intmax_t)uid);
540
case 131: /* --groupid */
541
tmp_id = strtoimax(arg, &tmp, 10);
542
if(errno != 0 or tmp == arg or *tmp != '\0'
543
or tmp_id != (gid_t)tmp_id){
544
argp_error(state, "Bad group ID number: \"%s\", using %"
545
PRIdMAX, arg, (intmax_t)gid);
551
case 132: /* --debug */
554
case 133: /* --plugin-helper-dir */
555
free(pluginhelperdir);
556
pluginhelperdir = strdup(arg);
557
if(pluginhelperdir != NULL){
562
* These reproduce what we would get without ARGP_NO_HELP
564
case '?': /* --help */
565
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
566
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
567
case -3: /* --usage */
568
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
569
argp_state_help(state, state->out_stream,
570
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
571
case 'V': /* --version */
572
fprintf(state->out_stream, "%s\n", argp_program_version);
576
* When adding more options before this line, remember to also add a
577
* "case" to the "parse_opt_config_file" function below.
580
/* Cryptsetup always passes an argument, which is an empty
581
string if "none" was specified in /etc/crypttab. So if
582
argument was empty, we ignore it silently. */
587
return ARGP_ERR_UNKNOWN;
589
return errno; /* Set to 0 at start */
592
/* This option parser is the same as parse_opt() above, except it
593
ignores everything but the --config-file option. */
594
error_t parse_opt_config_file(int key, char *arg,
595
__attribute__((unused))
596
struct argp_state *state){
599
case 'g': /* --global-options */
600
case 'G': /* --global-env */
601
case 'o': /* --options-for */
602
case 'E': /* --env-for */
603
case 'd': /* --disable */
604
case 'e': /* --enable */
605
case 128: /* --plugin-dir */
607
case 129: /* --config-file */
609
argfile = strdup(arg);
614
case 130: /* --userid */
615
case 131: /* --groupid */
616
case 132: /* --debug */
617
case 133: /* --plugin-helper-dir */
618
case '?': /* --help */
619
case -3: /* --usage */
620
case 'V': /* --version */
624
return ARGP_ERR_UNKNOWN;
629
struct argp argp = { .options = options,
630
.parser = parse_opt_config_file,
632
.doc = "Mandos plugin runner -- Run plugins" };
634
/* Parse using parse_opt_config_file() in order to get the custom
635
config file location, if any. */
636
ret = argp_parse(&argp, argc, argv,
637
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
645
error(0, errno, "argp_parse");
646
exitstatus = EX_OSERR;
649
exitstatus = EX_USAGE;
653
/* Reset to the normal argument parser */
654
argp.parser = parse_opt;
656
/* Open the configfile if available */
658
conffp = fopen(AFILE, "r");
660
conffp = fopen(argfile, "r");
663
char *org_line = NULL;
664
char *p, *arg, *new_arg, *line;
666
const char whitespace_delims[] = " \r\t\f\v\n";
667
const char comment_delim[] = "#";
670
custom_argv = malloc(sizeof(char*) * 2);
671
if(custom_argv == NULL){
672
error(0, errno, "malloc");
673
exitstatus = EX_OSERR;
676
custom_argv[0] = argv[0];
677
custom_argv[1] = NULL;
679
/* for each line in the config file, strip whitespace and ignore
682
sret = getline(&org_line, &size, conffp);
688
arg = strsep(&line, comment_delim);
689
while((p = strsep(&arg, whitespace_delims)) != NULL){
695
error(0, errno, "strdup");
696
exitstatus = EX_OSERR;
703
char **new_argv = realloc(custom_argv, sizeof(char *)
706
if(new_argv == NULL){
707
error(0, errno, "realloc");
708
exitstatus = EX_OSERR;
713
custom_argv = new_argv;
716
custom_argv[custom_argc-1] = new_arg;
717
custom_argv[custom_argc] = NULL;
721
ret = fclose(conffp);
722
} while(ret == EOF and errno == EINTR);
724
error(0, errno, "fclose");
725
exitstatus = EX_IOERR;
730
/* Check for harmful errors and go to fallback. Other errors might
731
not affect opening plugins */
732
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
733
error(0, errno, "fopen");
734
exitstatus = EX_OSERR;
738
/* If there were any arguments from the configuration file, pass
739
them to parser as command line arguments */
740
if(custom_argv != NULL){
741
ret = argp_parse(&argp, custom_argc, custom_argv,
742
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
750
error(0, errno, "argp_parse");
751
exitstatus = EX_OSERR;
754
exitstatus = EX_CONFIG;
759
/* Parse actual command line arguments, to let them override the
761
ret = argp_parse(&argp, argc, argv,
762
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
770
error(0, errno, "argp_parse");
771
exitstatus = EX_OSERR;
774
exitstatus = EX_USAGE;
779
char *pluginhelperenv;
781
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
782
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
784
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
786
if(ret == -1 or not bret){
787
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
788
" environment variable to \"%s\" for all plugins\n",
789
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
792
free(pluginhelperenv);
797
for(plugin *p = plugin_list; p != NULL; p=p->next){
798
fprintf(stderr, "Plugin: %s has %d arguments\n",
799
p->name ? p->name : "Global", p->argc - 1);
800
for(char **a = p->argv; *a != NULL; a++){
801
fprintf(stderr, "\tArg: %s\n", *a);
803
fprintf(stderr, "...and %d environment variables\n", p->envc);
804
for(char **a = p->environ; *a != NULL; a++){
805
fprintf(stderr, "\t%s\n", *a);
811
/* Work around Debian bug #633582:
812
<http://bugs.debian.org/633582> */
813
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
814
if(plugindir_fd == -1){
816
error(0, errno, "open(\"" PDIR "\")");
819
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
821
error(0, errno, "fstat");
823
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
824
ret = fchown(plugindir_fd, uid, gid);
826
error(0, errno, "fchown");
834
/* Lower permissions */
837
error(0, errno, "setgid");
841
error(0, errno, "setuid");
844
/* Open plugin directory with close_on_exec flag */
846
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
849
#else /* not O_CLOEXEC */
851
#endif /* not O_CLOEXEC */
854
error(0, errno, "Could not open plugin dir");
855
exitstatus = EX_UNAVAILABLE;
860
/* Set the FD_CLOEXEC flag on the directory */
861
ret = set_cloexec_flag(dir_fd);
863
error(0, errno, "set_cloexec_flag");
864
exitstatus = EX_OSERR;
867
#endif /* O_CLOEXEC */
870
int good_name(const struct dirent * const dirent){
871
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
872
"*.dpkg-old", "*.dpkg-bak",
873
"*.dpkg-divert", NULL };
875
#pragma GCC diagnostic push
876
#pragma GCC diagnostic ignored "-Wcast-qual"
878
for(const char **pat = (const char **)patterns;
879
*pat != NULL; pat++){
881
#pragma GCC diagnostic pop
883
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
886
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
887
" matching pattern %s\n", dirent->d_name, *pat);
896
#if __GLIBC_PREREQ(2, 15)
897
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
899
#else /* not __GLIBC_PREREQ(2, 15) */
900
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
901
&direntries, good_name, alphasort);
902
#endif /* not __GLIBC_PREREQ(2, 15) */
903
#else /* not __GLIBC__ */
904
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
905
&direntries, good_name, alphasort);
906
#endif /* not __GLIBC__ */
907
if(numplugins == -1){
908
error(0, errno, "Could not scan plugin dir");
910
exitstatus = EX_OSERR;
916
/* Read and execute any executable in the plugin directory*/
917
for(int i = 0; i < numplugins; i++){
919
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
921
error(0, errno, "Could not open plugin");
925
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
927
error(0, errno, "stat");
933
/* Ignore non-executable files */
934
if(not S_ISREG(st.st_mode)
935
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
938
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
939
" with bad type or mode\n",
940
plugindir != NULL ? plugindir : PDIR,
941
direntries[i]->d_name);
948
plugin *p = getplugin(direntries[i]->d_name);
950
error(0, errno, "getplugin");
957
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
958
direntries[i]->d_name);
965
/* Add global arguments to argument list for this plugin */
966
plugin *g = getplugin(NULL);
968
for(char **a = g->argv + 1; *a != NULL; a++){
969
if(not add_argument(p, *a)){
970
error(0, errno, "add_argument");
973
/* Add global environment variables */
974
for(char **e = g->environ; *e != NULL; e++){
975
if(not add_environment(p, *e, false)){
976
error(0, errno, "add_environment");
981
/* If this plugin has any environment variables, we need to
982
duplicate the environment from this process, too. */
983
if(p->environ[0] != NULL){
984
for(char **e = environ; *e != NULL; e++){
985
if(not add_environment(p, *e, false)){
986
error(0, errno, "add_environment");
993
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
994
#else /* O_CLOEXEC */
995
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
996
#endif /* O_CLOEXEC */
998
error(0, errno, "pipe");
999
exitstatus = EX_OSERR;
1000
free(direntries[i]);
1003
if(pipefd[0] >= FD_SETSIZE){
1004
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1008
exitstatus = EX_OSERR;
1009
free(direntries[i]);
1013
/* Ask OS to automatic close the pipe on exec */
1014
ret = set_cloexec_flag(pipefd[0]);
1016
error(0, errno, "set_cloexec_flag");
1019
exitstatus = EX_OSERR;
1020
free(direntries[i]);
1023
ret = set_cloexec_flag(pipefd[1]);
1025
error(0, errno, "set_cloexec_flag");
1028
exitstatus = EX_OSERR;
1029
free(direntries[i]);
1032
#endif /* not O_CLOEXEC */
1033
/* Block SIGCHLD until process is safely in process list */
1034
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1035
&sigchld_action.sa_mask,
1038
error(0, errno, "sigprocmask");
1039
exitstatus = EX_OSERR;
1040
free(direntries[i]);
1043
/* Starting a new process to be watched */
1047
} while(pid == -1 and errno == EINTR);
1049
error(0, errno, "fork");
1050
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1051
&sigchld_action.sa_mask, NULL));
1054
exitstatus = EX_OSERR;
1055
free(direntries[i]);
1059
/* this is the child process */
1060
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1062
error(0, errno, "sigaction");
1065
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1067
error(0, errno, "sigprocmask");
1071
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1073
error(0, errno, "dup2");
1077
if(fexecve(plugin_fd, p->argv,
1078
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1079
error(0, errno, "fexecve for %s/%s",
1080
plugindir != NULL ? plugindir : PDIR,
1081
direntries[i]->d_name);
1086
/* Parent process */
1087
close(pipefd[1]); /* Close unused write end of pipe */
1089
plugin *new_plugin = getplugin(direntries[i]->d_name);
1090
if(new_plugin == NULL){
1091
error(0, errno, "getplugin");
1092
ret = (int)(TEMP_FAILURE_RETRY
1093
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1096
error(0, errno, "sigprocmask");
1098
exitstatus = EX_OSERR;
1099
free(direntries[i]);
1102
free(direntries[i]);
1104
new_plugin->pid = pid;
1105
new_plugin->fd = pipefd[0];
1107
/* Unblock SIGCHLD so signal handler can be run if this process
1108
has already completed */
1109
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1110
&sigchld_action.sa_mask,
1113
error(0, errno, "sigprocmask");
1114
exitstatus = EX_OSERR;
1118
#if defined (__GNUC__) and defined (__GLIBC__)
1119
#if not __GLIBC_PREREQ(2, 16)
1120
#pragma GCC diagnostic push
1121
#pragma GCC diagnostic ignored "-Wsign-conversion"
1124
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1125
-Wconversion in GNU libc
1127
#if defined (__GNUC__) and defined (__GLIBC__)
1128
#if not __GLIBC_PREREQ(2, 16)
1129
#pragma GCC diagnostic pop
1133
if(maxfd < new_plugin->fd){
1134
maxfd = new_plugin->fd;
1142
free_plugin(getplugin(NULL));
1144
for(plugin *p = plugin_list; p != NULL; p = p->next){
1148
if(p->next == NULL){
1149
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1155
/* Main loop while running plugins exist */
1157
fd_set rfds = rfds_all;
1158
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1159
if(select_ret == -1 and errno != EINTR){
1160
error(0, errno, "select");
1161
exitstatus = EX_OSERR;
1164
/* OK, now either a process completed, or something can be read
1166
for(plugin *proc = plugin_list; proc != NULL;){
1167
/* Is this process completely done? */
1168
if(proc->completed and proc->eof){
1169
/* Only accept the plugin output if it exited cleanly */
1170
if(not WIFEXITED(proc->status)
1171
or WEXITSTATUS(proc->status) != 0){
1172
/* Bad exit by plugin */
1175
if(WIFEXITED(proc->status)){
1176
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1177
" status %d\n", proc->name,
1178
(intmax_t) (proc->pid),
1179
WEXITSTATUS(proc->status));
1180
} else if(WIFSIGNALED(proc->status)){
1181
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1182
" signal %d: %s\n", proc->name,
1183
(intmax_t) (proc->pid),
1184
WTERMSIG(proc->status),
1185
strsignal(WTERMSIG(proc->status)));
1186
} else if(WCOREDUMP(proc->status)){
1187
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1188
" core\n", proc->name, (intmax_t) (proc->pid));
1192
/* Remove the plugin */
1193
#if defined (__GNUC__) and defined (__GLIBC__)
1194
#if not __GLIBC_PREREQ(2, 16)
1195
#pragma GCC diagnostic push
1196
#pragma GCC diagnostic ignored "-Wsign-conversion"
1199
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1200
-Wconversion in GNU libc
1202
#if defined (__GNUC__) and defined (__GLIBC__)
1203
#if not __GLIBC_PREREQ(2, 16)
1204
#pragma GCC diagnostic pop
1208
/* Block signal while modifying process_list */
1209
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1211
&sigchld_action.sa_mask,
1214
error(0, errno, "sigprocmask");
1215
exitstatus = EX_OSERR;
1219
plugin *next_plugin = proc->next;
1223
/* We are done modifying process list, so unblock signal */
1224
ret = (int)(TEMP_FAILURE_RETRY
1225
(sigprocmask(SIG_UNBLOCK,
1226
&sigchld_action.sa_mask, NULL)));
1228
error(0, errno, "sigprocmask");
1229
exitstatus = EX_OSERR;
1233
if(plugin_list == NULL){
1240
/* This process exited nicely, so print its buffer */
1242
bool bret = print_out_password(proc->buffer,
1243
proc->buffer_length);
1245
error(0, errno, "print_out_password");
1246
exitstatus = EX_IOERR;
1251
/* This process has not completed. Does it have any output? */
1252
#if defined (__GNUC__) and defined (__GLIBC__)
1253
#if not __GLIBC_PREREQ(2, 16)
1254
#pragma GCC diagnostic push
1255
#pragma GCC diagnostic ignored "-Wsign-conversion"
1258
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1264
#if defined (__GNUC__) and defined (__GLIBC__)
1265
#if not __GLIBC_PREREQ(2, 16)
1266
#pragma GCC diagnostic pop
1269
/* This process had nothing to say at this time */
1273
/* Before reading, make the process' data buffer large enough */
1274
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1275
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1276
+ (size_t) BUFFER_SIZE);
1277
if(new_buffer == NULL){
1278
error(0, errno, "malloc");
1279
exitstatus = EX_OSERR;
1282
proc->buffer = new_buffer;
1283
proc->buffer_size += BUFFER_SIZE;
1285
/* Read from the process */
1286
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1288
+ proc->buffer_length,
1291
/* Read error from this process; ignore the error */
1299
proc->buffer_length += (size_t) sret;
1307
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1308
and exitstatus != EX_OK)){
1309
/* Fallback if all plugins failed, none are found or an error
1312
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1313
char *passwordbuffer = getpass("Password: ");
1314
size_t len = strlen(passwordbuffer);
1315
/* Strip trailing newline */
1316
if(len > 0 and passwordbuffer[len-1] == '\n'){
1317
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1320
bret = print_out_password(passwordbuffer, len);
1322
error(0, errno, "print_out_password");
1323
exitstatus = EX_IOERR;
1327
/* Restore old signal handler */
1328
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1330
error(0, errno, "sigaction");
1331
exitstatus = EX_OSERR;
1334
if(custom_argv != NULL){
1335
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1347
/* Kill the processes */
1348
for(plugin *p = plugin_list; p != NULL; p = p->next){
1351
ret = kill(p->pid, SIGTERM);
1352
if(ret == -1 and errno != ESRCH){
1353
/* Set-uid proccesses might not get closed */
1354
error(0, errno, "kill");
1359
/* Wait for any remaining child processes to terminate */
1363
if(errno != ECHILD){
1364
error(0, errno, "wait");
1370
free(pluginhelperdir);