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/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
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/* -*- coding: utf-8 -*- */
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3
* Mandos plugin runner - Run Mandos plugins
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* Copyright © 2008-2018 Teddy Hogeborn
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* Copyright © 2008-2018 Björn Påhlsson
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* This file is part of Mandos.
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* Mandos is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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* Mandos is distributed in the hope that it will be useful, but
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* Copyright © 2007-2008 Teddy Hogeborn & 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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14
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15
* 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 Mandos. If not, see <http://www.gnu.org/licenses/>.
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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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* Contact the authors at <mandos@fukt.bsnet.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(), reallocarray(), realloc(),
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EXIT_SUCCESS, exit() */
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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> /* 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 <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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uid_t, gid_t, getuid(), getgid(),
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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 <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> /* 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 <dirent.h> /* DIR, struct dirent, opendir(),
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readdir(), closedir(), dirfd() */
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#include <unistd.h> /* struct stat, stat(), S_ISREG(),
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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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execv(), write(), read(),
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#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
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FD_CLOEXEC, openat(), scandirat(),
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#include <string.h> /* strsep, strlen(), strsignal(),
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strcmp(), strncmp() */
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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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size_t buffer_size;
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size_t buffer_length;
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volatile sig_atomic_t completed;
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volatile bool completed;
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struct plugin *next;
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static plugin *plugin_list = NULL;
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/* Gets an existing plugin based on name,
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/* Gets a existing plugin based on name,
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or if none is found, creates a new one */
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__attribute__((warn_unused_result))
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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))){
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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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/* Create a new plugin */
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plugin *new_plugin = NULL;
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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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char *copy_name = NULL;
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if(name != NULL){
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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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*new_plugin = (plugin){ .name = copy_name,
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.next = plugin_list };
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new_plugin->argv = malloc(sizeof(char *) * 2);
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} while(new_plugin->argv == NULL and errno == EINTR);
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if(new_plugin->argv == NULL){
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*new_plugin = (plugin) { .name = copy_name,
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.next = plugin_list };
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new_plugin->argv = malloc(sizeof(char *) * 2);
128
if (new_plugin->argv == NULL){
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free(new_plugin);
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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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new_plugin->environ = malloc(sizeof(char *));
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if(new_plugin->environ == NULL){
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free(new_plugin->argv);
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free(new_plugin);
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new_plugin->environ[0] = NULL;
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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 },
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{ .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
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{ .name = "help", .key = '?',
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.doc = "Give this help list", .group = -1 },
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{ .name = "usage", .key = -3,
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.doc = "Give a short usage message", .group = -1 },
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{ .name = "version", .key = 'V',
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.doc = "Print program version", .group = -1 },
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__attribute__((nonnull(3)))
448
error_t parse_opt(int key, char *arg, struct argp_state *state){
379
error_t parse_opt (int key, char *arg, __attribute__((unused))
380
struct argp_state *state) {
453
382
case 'g': /* --global-options */
456
while((plugin_option = strsep(&arg, ",")) != NULL){
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if(not add_argument(getplugin(NULL), plugin_option)){
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while((p = strsep(&arg, ",")) != NULL){
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if(not add_argument(getplugin(NULL), p)){
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perror("add_argument");
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return ARGP_ERR_UNKNOWN;
464
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case 'G': /* --global-env */
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if(add_environment(getplugin(NULL), arg, true)){
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char *envdef = strdup(arg);
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if(not add_environment(getplugin(NULL), envdef, true)){
406
perror("add_environment");
469
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case 'o': /* --options-for */
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char *option_list = strchr(arg, ':');
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if(option_list == NULL){
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argp_error(state, "No colon in \"%s\"", arg);
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argp_error(state, "Empty plugin name");
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while((option = strsep(&option_list, ",")) != NULL){
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if(not add_argument(getplugin(arg), option)){
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char *p_name = strsep(&arg, ":");
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if(p_name[0] == '\0'){
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char *opt = strsep(&arg, ":");
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while((p = strsep(&opt, ",")) != NULL){
426
if(not add_argument(getplugin(p_name), p)){
427
perror("add_argument");
428
return ARGP_ERR_UNKNOWN;
493
434
case 'E': /* --env-for */
495
439
char *envdef = strchr(arg, ':');
496
440
if(envdef == NULL){
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argp_error(state, "No colon in \"%s\"", arg);
443
char *p_name = strndup(arg, (size_t) (envdef-arg));
504
argp_error(state, "Empty plugin name");
508
if(add_environment(getplugin(arg), envdef, true)){
448
if(not add_environment(getplugin(p_name), envdef, true)){
449
perror("add_environment");
513
453
case 'd': /* --disable */
515
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plugin *p = getplugin(arg);
457
return ARGP_ERR_UNKNOWN;
522
462
case 'e': /* --enable */
524
464
plugin *p = getplugin(arg);
466
return ARGP_ERR_UNKNOWN;
531
471
case 128: /* --plugin-dir */
533
472
plugindir = strdup(arg);
534
if(plugindir != NULL){
473
if(plugindir == NULL){
538
477
case 129: /* --config-file */
539
478
/* This is already done by parse_opt_config_file() */
541
480
case 130: /* --userid */
542
tmp_id = strtoimax(arg, &tmp, 10);
543
if(errno != 0 or tmp == arg or *tmp != '\0'
544
or tmp_id != (uid_t)tmp_id){
545
argp_error(state, "Bad user ID number: \"%s\", using %"
546
PRIdMAX, arg, (intmax_t)uid);
481
uid = (uid_t)strtol(arg, NULL, 10);
552
483
case 131: /* --groupid */
553
tmp_id = strtoimax(arg, &tmp, 10);
554
if(errno != 0 or tmp == arg or *tmp != '\0'
555
or tmp_id != (gid_t)tmp_id){
556
argp_error(state, "Bad group ID number: \"%s\", using %"
557
PRIdMAX, arg, (intmax_t)gid);
484
gid = (gid_t)strtol(arg, NULL, 10);
563
486
case 132: /* --debug */
566
case 133: /* --plugin-helper-dir */
567
free(pluginhelperdir);
568
pluginhelperdir = strdup(arg);
569
if(pluginhelperdir != NULL){
574
* These reproduce what we would get without ARGP_NO_HELP
576
case '?': /* --help */
577
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
578
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
579
__builtin_unreachable();
580
case -3: /* --usage */
581
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
582
argp_state_help(state, state->out_stream,
583
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
584
__builtin_unreachable();
585
case 'V': /* --version */
586
fprintf(state->out_stream, "%s\n", argp_program_version);
590
* When adding more options before this line, remember to also add a
591
* "case" to the "parse_opt_config_file" function below.
593
489
case ARGP_KEY_ARG:
594
/* Cryptsetup always passes an argument, which is an empty
595
string if "none" was specified in /etc/crypttab. So if
596
argument was empty, we ignore it silently. */
601
__attribute__((fallthrough));
490
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
606
495
return ARGP_ERR_UNKNOWN;
608
return errno; /* Set to 0 at start */
611
500
/* This option parser is the same as parse_opt() above, except it
612
501
ignores everything but the --config-file option. */
613
error_t parse_opt_config_file(int key, char *arg,
614
__attribute__((unused))
615
struct argp_state *state){
502
error_t parse_opt_config_file (int key, char *arg,
503
__attribute__((unused))
504
struct argp_state *state) {
618
506
case 'g': /* --global-options */
619
507
case 'G': /* --global-env */
620
508
case 'o': /* --options-for */
712
587
new_arg = strdup(p);
713
588
if(new_arg == NULL){
714
error(0, errno, "strdup");
715
exitstatus = EX_OSERR;
590
exitstatus = EXIT_FAILURE;
720
595
custom_argc += 1;
722
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
723
char **new_argv = reallocarray(custom_argv, (size_t)custom_argc + 1,
726
char **new_argv = NULL;
727
if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
731
new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
735
if(new_argv == NULL){
736
error(0, errno, "reallocarray");
737
exitstatus = EX_OSERR;
742
custom_argv = new_argv;
596
custom_argv = realloc(custom_argv, sizeof(char *)
597
* ((unsigned int) custom_argc + 1));
598
if(custom_argv == NULL){
600
exitstatus = EXIT_FAILURE;
745
604
custom_argv[custom_argc-1] = new_arg;
746
custom_argv[custom_argc] = NULL;
605
custom_argv[custom_argc] = NULL;
750
ret = fclose(conffp);
751
} while(ret == EOF and errno == EINTR);
753
error(0, errno, "fclose");
754
exitstatus = EX_IOERR;
759
610
/* Check for harmful errors and go to fallback. Other errors might
760
611
not affect opening plugins */
761
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
762
error(0, errno, "fopen");
763
exitstatus = EX_OSERR;
612
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
614
exitstatus = EXIT_FAILURE;
767
/* If there were any arguments from the configuration file, pass
768
them to parser as command line arguments */
618
/* If there was any arguments from configuration file,
619
pass them to parser as command arguments */
769
620
if(custom_argv != NULL){
770
ret = argp_parse(&argp, custom_argc, custom_argv,
771
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
779
error(0, errno, "argp_parse");
780
exitstatus = EX_OSERR;
783
exitstatus = EX_CONFIG;
621
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
623
if (ret == ARGP_ERR_UNKNOWN){
624
fprintf(stderr, "Unknown error while parsing arguments\n");
625
exitstatus = EXIT_FAILURE;
788
630
/* Parse actual command line arguments, to let them override the
790
ret = argp_parse(&argp, argc, argv,
791
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
799
error(0, errno, "argp_parse");
800
exitstatus = EX_OSERR;
803
exitstatus = EX_USAGE;
808
char *pluginhelperenv;
810
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
811
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
813
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
815
if(ret == -1 or not bret){
816
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
817
" environment variable to \"%s\" for all plugins\n",
818
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
821
free(pluginhelperenv);
632
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
633
if (ret == ARGP_ERR_UNKNOWN){
634
fprintf(stderr, "Unknown error while parsing arguments\n");
635
exitstatus = EXIT_FAILURE;
826
for(plugin *p = plugin_list; p != NULL; p = p->next){
640
for(plugin *p = plugin_list; p != NULL; p=p->next){
827
641
fprintf(stderr, "Plugin: %s has %d arguments\n",
828
642
p->name ? p->name : "Global", p->argc - 1);
829
643
for(char **a = p->argv; *a != NULL; a++){
830
644
fprintf(stderr, "\tArg: %s\n", *a);
832
fprintf(stderr, "...and %d environment variables\n", p->envc);
646
fprintf(stderr, "...and %u environment variables\n", p->envc);
833
647
for(char **a = p->environ; *a != NULL; a++){
834
648
fprintf(stderr, "\t%s\n", *a);
840
/* Work around Debian bug #633582:
841
<https://bugs.debian.org/633582> */
842
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
843
if(plugindir_fd == -1){
845
error(0, errno, "open(\"" PDIR "\")");
848
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
850
error(0, errno, "fstat");
852
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
853
ret = fchown(plugindir_fd, uid, gid);
855
error(0, errno, "fchown");
863
/* Lower permissions */
866
error(0, errno, "setgid");
653
/* Strip permissions down to nobody */
868
654
ret = setuid(uid);
870
error(0, errno, "setuid");
873
/* Open plugin directory with close_on_exec flag */
663
if (plugindir == NULL){
666
dir = opendir(plugindir);
670
perror("Could not open plugin dir");
671
exitstatus = EXIT_FAILURE;
675
/* Set the FD_CLOEXEC flag on the directory, if possible */
875
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
878
#else /* not O_CLOEXEC */
880
#endif /* not O_CLOEXEC */
883
error(0, errno, "Could not open plugin dir");
884
exitstatus = EX_UNAVAILABLE;
889
/* Set the FD_CLOEXEC flag on the directory */
890
ret = set_cloexec_flag(dir_fd);
892
error(0, errno, "set_cloexec_flag");
893
exitstatus = EX_OSERR;
896
#endif /* O_CLOEXEC */
899
int good_name(const struct dirent * const dirent){
900
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
901
"*.dpkg-old", "*.dpkg-bak",
902
"*.dpkg-divert", NULL };
904
#pragma GCC diagnostic push
905
#pragma GCC diagnostic ignored "-Wcast-qual"
907
for(const char **pat = (const char **)patterns;
908
*pat != NULL; pat++){
910
#pragma GCC diagnostic pop
912
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
915
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
916
" matching pattern %s\n", dirent->d_name, *pat);
677
int dir_fd = dirfd(dir);
679
ret = set_cloexec_flag(dir_fd);
681
perror("set_cloexec_flag");
682
exitstatus = EXIT_FAILURE;
924
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
926
if(numplugins == -1){
927
error(0, errno, "Could not scan plugin dir");
929
exitstatus = EX_OSERR;
933
688
FD_ZERO(&rfds_all);
935
690
/* Read and execute any executable in the plugin directory*/
936
for(int i = 0; i < numplugins; i++){
938
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
940
error(0, errno, "Could not open plugin");
944
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
946
error(0, errno, "stat");
692
dirst = readdir(dir);
694
/* All directory entries have been processed */
698
exitstatus = EXIT_FAILURE;
704
d_name_len = strlen(dirst->d_name);
706
/* Ignore dotfiles, backup files and other junk */
708
bool bad_name = false;
710
const char const *bad_prefixes[] = { ".", "#", NULL };
712
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
714
".dpkg-divert", NULL };
715
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
716
size_t pre_len = strlen(*pre);
717
if((d_name_len >= pre_len)
718
and strncmp((dirst->d_name), *pre, pre_len) == 0){
720
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
721
" with bad prefix %s\n", dirst->d_name, *pre);
730
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
731
size_t suf_len = strlen(*suf);
732
if((d_name_len >= suf_len)
733
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
736
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
737
" with bad suffix %s\n", dirst->d_name, *suf);
750
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
756
ret = stat(filename, &st);
952
763
/* Ignore non-executable files */
953
if(not S_ISREG(st.st_mode)
954
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
764
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
957
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
958
" with bad type or mode\n",
959
plugindir != NULL ? plugindir : PDIR,
960
direntries[i]->d_name);
766
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
767
" with bad type or mode\n", filename);
967
plugin *p = getplugin(direntries[i]->d_name);
773
plugin *p = getplugin(dirst->d_name);
969
error(0, errno, "getplugin");
976
781
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
977
direntries[i]->d_name);
987
791
for(char **a = g->argv + 1; *a != NULL; a++){
988
792
if(not add_argument(p, *a)){
989
error(0, errno, "add_argument");
793
perror("add_argument");
992
796
/* Add global environment variables */
993
797
for(char **e = g->environ; *e != NULL; e++){
994
798
if(not add_environment(p, *e, false)){
995
error(0, errno, "add_environment");
799
perror("add_environment");
1000
/* If this plugin has any environment variables, we need to
1001
duplicate the environment from this process, too. */
804
/* If this plugin has any environment variables, we will call
805
using execve and need to duplicate the environment from this
1002
807
if(p->environ[0] != NULL){
1003
808
for(char **e = environ; *e != NULL; e++){
1004
809
if(not add_environment(p, *e, false)){
1005
error(0, errno, "add_environment");
810
perror("add_environment");
1012
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1013
#else /* O_CLOEXEC */
1014
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
1015
#endif /* O_CLOEXEC */
1017
error(0, errno, "pipe");
1018
exitstatus = EX_OSERR;
1019
free(direntries[i]);
1022
if(pipefd[0] >= FD_SETSIZE){
1023
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1027
exitstatus = EX_OSERR;
1028
free(direntries[i]);
819
exitstatus = EXIT_FAILURE;
1032
822
/* Ask OS to automatic close the pipe on exec */
1033
823
ret = set_cloexec_flag(pipefd[0]);
1035
error(0, errno, "set_cloexec_flag");
1038
exitstatus = EX_OSERR;
1039
free(direntries[i]);
825
perror("set_cloexec_flag");
826
exitstatus = EXIT_FAILURE;
1042
829
ret = set_cloexec_flag(pipefd[1]);
1044
error(0, errno, "set_cloexec_flag");
1047
exitstatus = EX_OSERR;
1048
free(direntries[i]);
831
perror("set_cloexec_flag");
832
exitstatus = EXIT_FAILURE;
1051
#endif /* not O_CLOEXEC */
1052
835
/* Block SIGCHLD until process is safely in process list */
1053
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1054
&sigchld_action.sa_mask,
836
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1057
error(0, errno, "sigprocmask");
1058
exitstatus = EX_OSERR;
1059
free(direntries[i]);
838
perror("sigprocmask");
839
exitstatus = EXIT_FAILURE;
1062
842
/* Starting a new process to be watched */
1066
} while(pid == -1 and errno == EINTR);
1068
error(0, errno, "fork");
1069
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1070
&sigchld_action.sa_mask, NULL));
1073
exitstatus = EX_OSERR;
1074
free(direntries[i]);
846
exitstatus = EXIT_FAILURE;
1078
850
/* this is the child process */
1079
851
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1081
error(0, errno, "sigaction");
1084
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
856
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1086
error(0, errno, "sigprocmask");
858
perror("sigprocmask");
1090
862
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1092
error(0, errno, "dup2");
1096
if(fexecve(plugin_fd, p->argv,
1097
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1098
error(0, errno, "fexecve for %s/%s",
1099
plugindir != NULL ? plugindir : PDIR,
1100
direntries[i]->d_name);
869
/* If dir has no file descriptor, we could not set FD_CLOEXEC
870
above and must now close it manually here. */
873
if(p->environ[0] == NULL){
874
if(execv(filename, p->argv) < 0){
879
if(execve(filename, p->argv, p->environ) < 0){
1105
886
/* Parent process */
1106
887
close(pipefd[1]); /* Close unused write end of pipe */
1108
plugin *new_plugin = getplugin(direntries[i]->d_name);
1109
if(new_plugin == NULL){
1110
error(0, errno, "getplugin");
1111
ret = (int)(TEMP_FAILURE_RETRY
1112
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
889
plugin *new_plugin = getplugin(dirst->d_name);
890
if (new_plugin == NULL){
892
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1115
error(0, errno, "sigprocmask");
894
perror("sigprocmask");
1117
exitstatus = EX_OSERR;
1118
free(direntries[i]);
896
exitstatus = EXIT_FAILURE;
1121
free(direntries[i]);
1123
900
new_plugin->pid = pid;
1124
901
new_plugin->fd = pipefd[0];
1127
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1128
new_plugin->name, (intmax_t) (new_plugin->pid));
1131
903
/* Unblock SIGCHLD so signal handler can be run if this process
1132
904
has already completed */
1133
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1134
&sigchld_action.sa_mask,
905
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1137
error(0, errno, "sigprocmask");
1138
exitstatus = EX_OSERR;
907
perror("sigprocmask");
908
exitstatus = EXIT_FAILURE;
1142
912
FD_SET(new_plugin->fd, &rfds_all);
1144
if(maxfd < new_plugin->fd){
914
if (maxfd < new_plugin->fd){
1145
915
maxfd = new_plugin->fd;
1153
free_plugin(getplugin(NULL));
1155
923
for(plugin *p = plugin_list; p != NULL; p = p->next){
1156
924
if(p->pid != 0){
1162
930
free_plugin_list();
1166
934
/* Main loop while running plugins exist */
1167
935
while(plugin_list){
1168
936
fd_set rfds = rfds_all;
1169
937
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1170
if(select_ret == -1 and errno != EINTR){
1171
error(0, errno, "select");
1172
exitstatus = EX_OSERR;
938
if (select_ret == -1){
940
exitstatus = EXIT_FAILURE;
1175
943
/* OK, now either a process completed, or something can be read
1176
944
from one of them */
1177
for(plugin *proc = plugin_list; proc != NULL;){
945
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1178
946
/* Is this process completely done? */
1179
if(proc->completed and proc->eof){
947
if(proc->eof and proc->completed){
1180
948
/* Only accept the plugin output if it exited cleanly */
1181
949
if(not WIFEXITED(proc->status)
1182
950
or WEXITSTATUS(proc->status) != 0){
1183
951
/* Bad exit by plugin */
1186
954
if(WIFEXITED(proc->status)){
1187
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1188
" status %d\n", proc->name,
1189
(intmax_t) (proc->pid),
955
fprintf(stderr, "Plugin %u exited with status %d\n",
956
(unsigned int) (proc->pid),
1190
957
WEXITSTATUS(proc->status));
1191
} else if(WIFSIGNALED(proc->status)){
1192
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1193
" signal %d: %s\n", proc->name,
1194
(intmax_t) (proc->pid),
1195
WTERMSIG(proc->status),
1196
strsignal(WTERMSIG(proc->status)));
958
} else if(WIFSIGNALED(proc->status)) {
959
fprintf(stderr, "Plugin %u killed by signal %d\n",
960
(unsigned int) (proc->pid),
961
WTERMSIG(proc->status));
962
} else if(WCOREDUMP(proc->status)){
963
fprintf(stderr, "Plugin %d dumped core\n",
964
(unsigned int) (proc->pid));
1200
968
/* Remove the plugin */
1201
969
FD_CLR(proc->fd, &rfds_all);
1203
971
/* Block signal while modifying process_list */
1204
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1206
&sigchld_action.sa_mask,
972
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1209
error(0, errno, "sigprocmask");
1210
exitstatus = EX_OSERR;
974
perror("sigprocmask");
975
exitstatus = EXIT_FAILURE;
1214
plugin *next_plugin = proc->next;
1215
978
free_plugin(proc);
1218
979
/* We are done modifying process list, so unblock signal */
1219
ret = (int)(TEMP_FAILURE_RETRY
1220
(sigprocmask(SIG_UNBLOCK,
1221
&sigchld_action.sa_mask, NULL)));
980
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
1223
error(0, errno, "sigprocmask");
1224
exitstatus = EX_OSERR;
983
perror("sigprocmask");
984
exitstatus = EXIT_FAILURE;
1228
988
if(plugin_list == NULL){
1235
994
/* This process exited nicely, so print its buffer */
1237
996
bool bret = print_out_password(proc->buffer,
1238
997
proc->buffer_length);
1240
error(0, errno, "print_out_password");
1241
exitstatus = EX_IOERR;
999
perror("print_out_password");
1000
exitstatus = EXIT_FAILURE;
1246
1005
/* This process has not completed. Does it have any output? */
1247
1006
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1248
1007
/* This process had nothing to say at this time */
1252
1010
/* Before reading, make the process' data buffer large enough */
1253
1011
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1254
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1255
+ (size_t) BUFFER_SIZE);
1256
if(new_buffer == NULL){
1257
error(0, errno, "malloc");
1258
exitstatus = EX_OSERR;
1012
proc->buffer = realloc(proc->buffer, proc->buffer_size
1013
+ (size_t) BUFFER_SIZE);
1014
if (proc->buffer == NULL){
1016
exitstatus = EXIT_FAILURE;
1261
proc->buffer = new_buffer;
1262
1019
proc->buffer_size += BUFFER_SIZE;
1264
1021
/* Read from the process */
1265
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1267
+ proc->buffer_length,
1022
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1270
1025
/* Read error from this process; ignore the error */
1276
1030
proc->eof = true;
1278
proc->buffer_length += (size_t) sret;
1032
proc->buffer_length += (size_t) ret;
1286
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1287
and exitstatus != EX_OK)){
1040
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1288
1041
/* Fallback if all plugins failed, none are found or an error
1291
1044
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1292
1045
char *passwordbuffer = getpass("Password: ");
1293
size_t len = strlen(passwordbuffer);
1294
/* Strip trailing newline */
1295
if(len > 0 and passwordbuffer[len-1] == '\n'){
1296
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1299
bret = print_out_password(passwordbuffer, len);
1046
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1301
error(0, errno, "print_out_password");
1302
exitstatus = EX_IOERR;
1048
perror("print_out_password");
1049
exitstatus = EXIT_FAILURE;
1306
1053
/* Restore old signal handler */
1307
1054
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1309
error(0, errno, "sigaction");
1310
exitstatus = EX_OSERR;
1056
perror("sigaction");
1057
exitstatus = EXIT_FAILURE;
1313
1060
if(custom_argv != NULL){
1314
1061
for(char **arg = custom_argv+1; *arg != NULL; arg++){