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* Mandos plugin runner - Run Mandos plugins
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* Copyright © 2008-2020 Teddy Hogeborn
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* Copyright © 2008-2020 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 © 2008-2014 Teddy Hogeborn
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* Copyright © 2008-2014 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 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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#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
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O_CLOEXEC, pipe2() */
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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_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/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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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 */
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#include <dirent.h> /* struct dirent, scandirat() */
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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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#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
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new_array = reallocarray(*array, (size_t)((*len) + 2),
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if(((size_t)((*len) + 2)) > (SIZE_MAX / sizeof(char *))){
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new_array = realloc(*array, (size_t)((*len) + 2)
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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);
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/* Malloc check */
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if(new_array == NULL){
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__attribute__((nonnull))
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static void free_plugin(plugin *plugin_node){
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for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
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for(char **arg = plugin_node->argv; *arg != NULL; arg++){
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free(plugin_node->name);
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free(plugin_node->argv);
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for(char **env = plugin_node->environ; *env != NULL; env++){
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int main(int argc, char *argv[]){
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char *plugindir = NULL;
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char *pluginhelperdir = NULL;
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char *argfile = NULL;
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struct dirent **direntries = NULL;
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struct dirent **direntries;
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int ret, maxfd = 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 },
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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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case 132: /* --debug */
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case 133: /* --plugin-helper-dir */
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free(pluginhelperdir);
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pluginhelperdir = strdup(arg);
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if(pluginhelperdir != NULL){
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* These reproduce what we would get without ARGP_NO_HELP
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case '?': /* --help */
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state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
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argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
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__builtin_unreachable();
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case -3: /* --usage */
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state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
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argp_state_help(state, state->out_stream,
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ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
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__builtin_unreachable();
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case 'V': /* --version */
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fprintf(state->out_stream, "%s\n", argp_program_version);
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exit(EXIT_SUCCESS);
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custom_argc += 1;
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#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
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char **new_argv = reallocarray(custom_argv, (size_t)custom_argc + 1,
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char **new_argv = NULL;
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if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
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new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
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char **new_argv = realloc(custom_argv, sizeof(char *)
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if(new_argv == NULL){
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error(0, errno, "reallocarray");
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error(0, errno, "realloc");
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exitstatus = EX_OSERR;
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char *pluginhelperenv;
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ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
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pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
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bret = add_environment(getplugin(NULL), pluginhelperenv, true);
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if(ret == -1 or not bret){
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error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
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" environment variable to \"%s\" for all plugins\n",
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pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
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free(pluginhelperenv);
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for(plugin *p = plugin_list; p != NULL; p = p->next){
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for(plugin *p = plugin_list; p != NULL; p=p->next){
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fprintf(stderr, "Plugin: %s has %d arguments\n",
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p->name ? p->name : "Global", p->argc - 1);
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for(char **a = p->argv; *a != NULL; a++){
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if(getuid() == 0){
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/* Work around Debian bug #633582:
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<https://bugs.debian.org/633582> */
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<http://bugs.debian.org/633582> */
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int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
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if(plugindir_fd == -1){
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if(errno != ENOENT){
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#if __GLIBC_PREREQ(2, 15)
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int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
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#else /* not __GLIBC_PREREQ(2, 15) */
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int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
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&direntries, good_name, alphasort);
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#endif /* not __GLIBC_PREREQ(2, 15) */
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#else /* not __GLIBC__ */
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int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
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&direntries, good_name, alphasort);
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#endif /* not __GLIBC__ */
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if(numplugins == -1){
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error(0, errno, "Could not scan plugin dir");
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TEMP_FAILURE_RETRY(close(dir_fd));
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exitstatus = EX_OSERR;
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int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
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if(plugin_fd == -1){
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error(0, errno, "Could not open plugin");
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ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
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error(0, errno, "stat");
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TEMP_FAILURE_RETRY(close(plugin_fd));
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plugindir != NULL ? plugindir : PDIR,
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direntries[i]->d_name);
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TEMP_FAILURE_RETRY(close(plugin_fd));
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plugin *p = getplugin(direntries[i]->d_name);
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error(0, errno, "getplugin");
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TEMP_FAILURE_RETRY(close(plugin_fd));
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error(0, errno, "pipe");
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exitstatus = EX_OSERR;
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free(direntries[i]);
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if(pipefd[0] >= FD_SETSIZE){
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fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
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TEMP_FAILURE_RETRY(close(pipefd[0]));
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TEMP_FAILURE_RETRY(close(pipefd[1]));
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exitstatus = EX_OSERR;
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free(direntries[i]);
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#ifndef O_CLOEXEC
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ret = set_cloexec_flag(pipefd[0]);
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error(0, errno, "set_cloexec_flag");
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TEMP_FAILURE_RETRY(close(pipefd[0]));
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TEMP_FAILURE_RETRY(close(pipefd[1]));
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exitstatus = EX_OSERR;
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free(direntries[i]);
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ret = set_cloexec_flag(pipefd[1]);
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error(0, errno, "set_cloexec_flag");
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TEMP_FAILURE_RETRY(close(pipefd[0]));
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TEMP_FAILURE_RETRY(close(pipefd[1]));
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exitstatus = EX_OSERR;
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free(direntries[i]);
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#endif /* not O_CLOEXEC */
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error(0, errno, "fork");
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TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
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&sigchld_action.sa_mask, NULL));
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TEMP_FAILURE_RETRY(close(pipefd[0]));
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TEMP_FAILURE_RETRY(close(pipefd[1]));
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exitstatus = EX_OSERR;
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free(direntries[i]);
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/* no return */
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/* Parent process */
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close(pipefd[1]); /* Close unused write end of pipe */
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TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
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TEMP_FAILURE_RETRY(close(plugin_fd));
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plugin *new_plugin = getplugin(direntries[i]->d_name);
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if(new_plugin == NULL){
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error(0, errno, "getplugin");
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error(0, errno, "sigprocmask");
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exitstatus = EX_OSERR;
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free(direntries[i]);
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free(direntries[i]);
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new_plugin->pid = pid;
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new_plugin->fd = pipefd[0];
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fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
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new_plugin->name, (intmax_t) (new_plugin->pid));
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/* Unblock SIGCHLD so signal handler can be run if this process
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has already completed */
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ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
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FD_SET(new_plugin->fd, &rfds_all);
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#if defined (__GNUC__) and defined (__GLIBC__)
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#if not __GLIBC_PREREQ(2, 16)
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wsign-conversion"
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FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
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-Wconversion in GNU libc
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#if defined (__GNUC__) and defined (__GLIBC__)
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#if not __GLIBC_PREREQ(2, 16)
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#pragma GCC diagnostic pop
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if(maxfd < new_plugin->fd){
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maxfd = new_plugin->fd;
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TEMP_FAILURE_RETRY(close(dir_fd));
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free_plugin(getplugin(NULL));
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for(plugin *p = plugin_list; p != NULL; p = p->next){
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(intmax_t) (proc->pid),
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WTERMSIG(proc->status),
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strsignal(WTERMSIG(proc->status)));
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} else if(WCOREDUMP(proc->status)){
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fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
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" core\n", proc->name, (intmax_t) (proc->pid));
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/* Remove the plugin */
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FD_CLR(proc->fd, &rfds_all);
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#if defined (__GNUC__) and defined (__GLIBC__)
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#if not __GLIBC_PREREQ(2, 16)
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wsign-conversion"
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FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
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-Wconversion in GNU libc
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#if defined (__GNUC__) and defined (__GLIBC__)
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#if not __GLIBC_PREREQ(2, 16)
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#pragma GCC diagnostic pop
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/* Block signal while modifying process_list */
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ret = (int)TEMP_FAILURE_RETRY(sigprocmask
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/* This process has not completed. Does it have any output? */
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if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
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#if defined (__GNUC__) and defined (__GLIBC__)
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#if not __GLIBC_PREREQ(2, 16)
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wsign-conversion"
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if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
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#if defined (__GNUC__) and defined (__GLIBC__)
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#if not __GLIBC_PREREQ(2, 16)
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#pragma GCC diagnostic pop
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/* This process had nothing to say at this time */
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proc = proc->next;
added
removed
plugin-runner.c
