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21
* Contact the authors at <mandos@fukt.bsnet.se>.
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
26
#include <stddef.h> /* size_t, NULL */
27
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
28
EXIT_SUCCESS, realloc() */
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52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
54
#include <string.h> /* strtok, strlen(), strcpy(),
54
#include <string.h> /* strsep, strlen(), asprintf() */
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55
#include <errno.h> /* errno */
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56
#include <argp.h> /* struct argp_option, struct
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57
argp_state, struct argp,
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58
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
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ARGP_KEY_END, ARGP_KEY_ARG,
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61
#include <signal.h> /* struct sigaction, sigemptyset(),
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sigaddset(), sigaction(),
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sigprocmask(), SIG_BLOCK, SIGCHLD,
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104
/* Create a new plugin */
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105
plugin *new_plugin = malloc(sizeof(plugin));
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106
if (new_plugin == NULL){
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new_plugin->name = name;
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char *copy_name = NULL;
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copy_name = strdup(name);
112
if(copy_name == NULL){
117
*new_plugin = (plugin) { .name = copy_name,
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.next = *plugin_list };
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123
new_plugin->argv = malloc(sizeof(char *) * 2);
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124
if (new_plugin->argv == NULL){
110
new_plugin->argv[0] = name;
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new_plugin->argv[0] = copy_name;
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130
new_plugin->argv[1] = NULL;
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new_plugin->argc = 1;
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new_plugin->disabled = false;
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new_plugin->next = *plugin_list;
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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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new_plugin->environ[0] = NULL;
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/* Append the new plugin to the list */
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141
*plugin_list = new_plugin;
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142
return new_plugin;
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static void addargument(plugin *p, char *arg){
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p->argv[p->argc] = arg;
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p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
123
if (p->argv == NULL){
128
p->argv[p->argc] = NULL;
145
/* Helper function for add_argument and add_environment */
146
static bool add_to_char_array(const char *new, char ***array,
148
/* Resize the pointed-to array to hold one more pointer */
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*array = realloc(*array, sizeof(char *)
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* (size_t) ((*len) + 2));
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/* Make a copy of the new string */
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char *copy = strdup(new);
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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;
168
/* Add to a plugin's argument vector */
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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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static bool add_environment(plugin *p, const char *def){
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return add_to_char_array(def, &(p->environ), &(p->envc));
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* Based on the example in the GNU LibC manual chapter 13.13 "File
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198
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
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const char *argp_program_version = "plugbasedclient 0.9";
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const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
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201
process *process_list = NULL;
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/* Mark a process as completed when it exits, and save its exit
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/* Mark processes as completed when they exit, and save their exit
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205
void handle_sigchld(__attribute__((unused)) int sig){
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process *proc = process_list;
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pid_t pid = wait(&status);
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while(proc != NULL and proc->pid != pid){
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/* Process not found in process list */
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proc->status = status;
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proc->completed = true;
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process *proc = process_list;
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pid_t pid = waitpid(-1, &status, WNOHANG);
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/* Only still running child processes */
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if (errno != ECHILD){
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/* No child processes */
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/* A child exited, find it in process_list */
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while(proc != NULL and proc->pid != pid){
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/* Process not found in process list */
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proc->status = status;
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proc->completed = true;
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bool print_out_password(const char *buffer, size_t length){
237
if(length>0 and buffer[length-1] == '\n'){
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for(size_t written = 0; written < length; written += (size_t)ret){
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ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
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char **add_to_argv(char **argv, int *argc, char *arg){
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argv = malloc(sizeof(char*) * 2);
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argv[0] = NULL; /* Will be set to argv[0] in main before
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argv = realloc(argv, sizeof(char *)
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* ((unsigned int) *argc + 1));
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static void free_plugin_list(plugin *plugin_list){
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for(plugin *next; plugin_list != NULL; plugin_list = next){
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next = plugin_list->next;
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for(char **arg = plugin_list->argv; *arg != NULL; arg++){
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free(plugin_list->argv);
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for(char **env = plugin_list->environ; *env != NULL; env++){
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free(plugin_list->environ);
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287
int main(int argc, char *argv[]){
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const char *plugindir = "/conf/conf.d/mandos/plugins.d";
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const char *plugindir = "/lib/mandos/plugins.d";
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const char *argfile = ARGFILE;
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291
size_t d_name_len;
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293
struct dirent *dirst;
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301
struct sigaction old_sigchld_action;
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struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
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.sa_flags = SA_NOCLDSTOP };
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char *plus_options = NULL;
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char **plus_argv = NULL;
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char **custom_argv = NULL;
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307
/* Establish a signal handler */
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sigemptyset(&sigchld_action.sa_mask);
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ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
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311
perror("sigaddset");
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exitstatus = EXIT_FAILURE;
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315
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
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perror("sigaction");
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exitstatus = EXIT_FAILURE;
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/* The options we understand. */
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{ .name = "global-options", .key = 'g',
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.arg = "OPTION[,OPTION[,...]]",
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.doc = "Options passed to all plugins" },
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{ .name = "global-envs", .key = 'e',
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.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" },
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{ .name = "envs-for", .key = 'f',
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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 },
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if (arg != NULL){
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char *p = strtok(arg, ",");
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addargument(getplugin(NULL, plugins), p);
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p = strtok(NULL, ",");
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while((p = strsep(&arg, ",")) != NULL){
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if(not add_argument(getplugin(NULL, plugins), p)){
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perror("add_argument");
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return ARGP_ERR_UNKNOWN;
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char *envdef = strdup(arg);
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if(not add_environment(getplugin(NULL, plugins), envdef)){
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perror("add_environment");
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387
if (arg != NULL){
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char *name = strtok(arg, ":");
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char *p = strtok(NULL, ":");
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addargument(getplugin(name, plugins), p);
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p = strtok(NULL, ",");
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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){
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if(not add_argument(getplugin(p_name, plugins), p)){
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perror("add_argument");
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return ARGP_ERR_UNKNOWN;
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char *envdef = strchr(arg, ':');
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char *p_name = strndup(arg, (size_t) (envdef-arg));
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if(not add_environment(getplugin(p_name, plugins), envdef)){
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perror("add_environment");
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if (arg != NULL){
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getplugin(arg, plugins)->disabled = true;
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plugin *p = getplugin(arg, plugins);
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return ARGP_ERR_UNKNOWN;
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ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
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if (ret == ARGP_ERR_UNKNOWN){
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fprintf(stderr, "Unkown error while parsing arguments\n");
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fprintf(stderr, "Unknown error while parsing arguments\n");
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exitstatus = EXIT_FAILURE;
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/* This is a mangled argument in the form of
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"+--option+--other-option=parameter+--yet-another-option", etc */
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/* Make new argc and argv vars, and call argp_parse() again. */
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plus_options++; /* skip the first '+' character */
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const char delims[] = "+";
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plus_argv = malloc(sizeof(char*) * 2);
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if(plus_argv == NULL){
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conffp = fopen(argfile, "r");
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char *org_line = NULL;
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char *p, *arg, *new_arg, *line;
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const char whitespace_delims[] = " \r\t\f\v\n";
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const char comment_delim[] = "#";
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sret = getline(&org_line, &size, conffp);
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arg = strsep(&line, comment_delim);
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while((p = strsep(&arg, whitespace_delims)) != NULL){
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custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
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if (custom_argv == NULL){
498
perror("add_to_argv");
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exitstatus = EXIT_FAILURE;
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/* Check for harmful errors and go to fallback. Other errors might
507
not affect opening plugins */
508
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
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510
exitstatus = EXIT_FAILURE;
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plus_argv[0] = argv[0];
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arg = strtok(plus_options, delims); /* Get first argument */
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plus_argv = realloc(plus_argv, sizeof(char *)
320
* ((unsigned int) new_argc + 1));
321
if(plus_argv == NULL){
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exitstatus = EXIT_FAILURE;
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plus_argv[new_argc-1] = arg;
327
plus_argv[new_argc] = NULL;
328
arg = strtok(NULL, delims); /* Get next argument */
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ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
515
if(custom_argv != NULL){
516
custom_argv[0] = argv[0];
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ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0,
331
519
if (ret == ARGP_ERR_UNKNOWN){
332
fprintf(stderr, "Unkown error while parsing arguments\n");
520
fprintf(stderr, "Unknown error while parsing arguments\n");
333
521
exitstatus = EXIT_FAILURE;
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530
for(char **a = p->argv; *a != NULL; a++){
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531
fprintf(stderr, "\tArg: %s\n", *a);
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fprintf(stderr, "...and %u environment variables\n", p->envc);
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for(char **a = p->environ; *a != NULL; a++){
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fprintf(stderr, "\t%s\n", *a);
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char *filename = malloc(d_name_len + strlen(plugindir) + 2);
441
if (filename == NULL){
443
exitstatus = EXIT_FAILURE;
633
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
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strcpy(filename, plugindir); /* Spurious warning */
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strcat(filename, "/"); /* Spurious warning */
448
strcat(filename, dirst->d_name); /* Spurious warning */
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639
ret = stat(filename, &st);
453
exitstatus = EXIT_FAILURE;
457
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if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
473
plugin *p = getplugin(dirst->d_name, &plugin_list);
475
669
/* Add global arguments to argument list for this plugin */
476
670
plugin *g = getplugin(NULL, &plugin_list);
477
for(char **a = g->argv + 1; *a != NULL; a++){
672
for(char **a = g->argv + 1; *a != NULL; a++){
673
if(not add_argument(p, *a)){
674
perror("add_argument");
677
/* Add global environment variables */
678
for(char **e = g->environ; *e != NULL; e++){
679
if(not add_environment(p, *e)){
680
perror("add_environment");
685
/* If this plugin has any environment variables, we will call
686
using execve and need to duplicate the environment from this
688
if(p->environ[0] != NULL){
689
for(char **e = environ; *e != NULL; e++){
690
char *copy = strdup(*e);
695
if(not add_environment(p, copy)){
696
perror("add_environment");
482
702
ret = pipe(pipefd);
485
705
exitstatus = EXIT_FAILURE;
488
708
ret = set_cloexec_flag(pipefd[0]);
490
710
perror("set_cloexec_flag");
491
711
exitstatus = EXIT_FAILURE;
494
714
ret = set_cloexec_flag(pipefd[1]);
496
716
perror("set_cloexec_flag");
497
717
exitstatus = EXIT_FAILURE;
500
720
/* Block SIGCHLD until process is safely in process list */
501
721
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
503
723
perror("sigprocmask");
504
724
exitstatus = EXIT_FAILURE;
507
727
// Starting a new process to be watched
508
728
pid_t pid = fork();
731
exitstatus = EXIT_FAILURE;
510
735
/* this is the child process */
511
736
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
575
/* Free the plugin list */
576
for(plugin *next; plugin_list != NULL; plugin_list = next){
577
next = plugin_list->next;
578
free(plugin_list->argv);
807
free_plugin_list(plugin_list);
585
813
if (process_list == NULL){
586
fprintf(stderr, "No plugin processes started, exiting\n");
587
exitstatus = EXIT_FAILURE;
814
fprintf(stderr, "No plugin processes started. Incorrect plugin"
590
818
while(process_list){
591
819
fd_set rfds = rfds_all;
606
834
/* Bad exit by plugin */
608
836
if(WIFEXITED(proc->status)){
609
fprintf(stderr, "Plugin %d exited with status %d\n",
610
proc->pid, WEXITSTATUS(proc->status));
837
fprintf(stderr, "Plugin %u exited with status %d\n",
838
(unsigned int) (proc->pid),
839
WEXITSTATUS(proc->status));
611
840
} else if(WIFSIGNALED(proc->status)) {
612
fprintf(stderr, "Plugin %d killed by signal %d\n",
613
proc->pid, WTERMSIG(proc->status));
841
fprintf(stderr, "Plugin %u killed by signal %d\n",
842
(unsigned int) (proc->pid),
843
WTERMSIG(proc->status));
614
844
} else if(WCOREDUMP(proc->status)){
615
fprintf(stderr, "Plugin %d dumped core\n", proc->pid);
845
fprintf(stderr, "Plugin %d dumped core\n",
846
(unsigned int) (proc->pid));
618
849
/* Remove the plugin */
619
850
FD_CLR(proc->fd, &rfds_all);
620
851
/* Block signal while modifying process_list */
621
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
623
854
perror("sigprocmask");
624
855
exitstatus = EXIT_FAILURE;
627
858
/* Delete this process entry from the list */
628
859
if(process_list == proc){
653
884
/* This process exited nicely, so print its buffer */
654
for(size_t written = 0; written < proc->buffer_length;
655
written += (size_t)ret){
656
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
657
proc->buffer + written,
662
exitstatus = EXIT_FAILURE;
886
bool bret = print_out_password(proc->buffer,
887
proc->buffer_length);
889
perror("print_out_password");
890
exitstatus = EXIT_FAILURE;
668
894
/* This process has not completed. Does it have any output? */
669
895
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
699
if(process_list == NULL){
700
fprintf(stderr, "All plugin processes failed, exiting\n");
701
exitstatus = EXIT_FAILURE;
929
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
930
/* Fallback if all plugins failed, none are found or an error
933
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
934
char *passwordbuffer = getpass("Password: ");
935
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
937
perror("print_out_password");
938
exitstatus = EXIT_FAILURE;
705
942
/* Restore old signal handler */
706
sigaction(SIGCHLD, &old_sigchld_action, NULL);
710
/* Free the plugin list */
711
for(plugin *next; plugin_list != NULL; plugin_list = next){
712
next = plugin_list->next;
713
free(plugin_list->argv);
943
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
946
exitstatus = EXIT_FAILURE;
949
if(custom_argv != NULL){
950
for(char **arg = custom_argv; *arg != NULL; arg++){
955
free_plugin_list(plugin_list);