/mandos/trunk : revision 105

65

#include <errno.h> /* errno, EBADF */

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#define BUFFER_SIZE 256

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#define PDIR "/lib/mandos/plugins.d"

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#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"

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#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"

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const char *argp_program_version = "plugin-runner 1.0";

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const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";

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struct plugin;

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typedef struct plugin{

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char *name; /* can be NULL or any plugin name */

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char **argv;

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int argc;

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char **environ;

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int envc;

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bool disabled;

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/* Variables used for running processes*/

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struct process;

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typedef struct process{

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pid_t pid;

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int fd;

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char *buffer;

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bool eof;

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volatile bool completed;

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volatile int status;

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struct process *next;

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} process;

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typedef struct plugin{

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char *name; /* can be NULL or any plugin name */

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char **argv;

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int argc;

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char **environ;

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int envc;

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bool disabled;

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struct plugin *next;

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} plugin;

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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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static plugin *getplugin(char *name){

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/* Check for exiting plugin with that name */

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

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static plugin *getplugin(char *name, plugin **plugin_list){

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

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if ((p->name == name)

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or (p->name and name and (strcmp(p->name, name) == 0))){

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return p;

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*new_plugin = (plugin) { .name = copy_name,

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.argc = 1,

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.envc = 0,

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.disabled = false,

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.next = plugin_list };

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.next = *plugin_list };

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new_plugin->argv = malloc(sizeof(char *) * 2);

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if (new_plugin->argv == NULL){

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}

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new_plugin->argv[0] = copy_name;

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new_plugin->argv[1] = NULL;

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131

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new_plugin->environ = malloc(sizeof(char *));

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if(new_plugin->environ == NULL){

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free(copy_name);

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return NULL;

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}

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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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*plugin_list = new_plugin;

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return new_plugin;

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}

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}

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/* Add to a plugin's environment */

182

static bool add_environment(plugin *p, const char *def, bool replace){

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static bool add_environment(plugin *p, const char *def){

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178

if(p == NULL){

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179

return false;

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180

}

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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 **e = p->environ; *e != NULL; e++){

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if(strncmp(*e, def, namelen + 1) == 0){

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/* It already exists */

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if(replace){

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

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if(new == NULL){

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return false;

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}

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*e = new;

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strcpy(*e, def);

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}

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return true;

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}

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}

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return add_to_char_array(def, &(p->environ), &(p->envc));

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}

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/*

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* Based on the example in the GNU LibC manual chapter 13.13 "File

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* Descriptor Flags".

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return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);

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}

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process *process_list = NULL;

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/* Mark processes as completed when they exit, and save their exit

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status. */

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void handle_sigchld(__attribute__((unused)) int sig){

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while(true){

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plugin *proc = plugin_list;

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process *proc = process_list;

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int status;

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pid_t pid = waitpid(-1, &status, WNOHANG);

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if(pid == 0){

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/* No child processes */

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break;

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}

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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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proc = proc->next;

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}

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}

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/* Prints out a password to stdout */

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bool print_out_password(const char *buffer, size_t length){

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236

ssize_t ret;

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

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length--;

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}

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for(size_t written = 0; written < length; written += (size_t)ret){

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ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,

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length - written));

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return true;

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}

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/* Removes and free a plugin from the plugin list */

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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(*arg);

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}

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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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free(*env);

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}

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free(plugin_node->environ);

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free(plugin_node->buffer);

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

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if(plugin_node == plugin_list){

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/* First one - simple */

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plugin_list = plugin_list->next;

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} else {

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/* Second one or later */

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

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if(p->next == plugin_node){

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p->next = plugin_node->next;

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break;

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}

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char **add_to_argv(char **argv, int *argc, char *arg){

251

if (argv == NULL){

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*argc = 1;

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

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if(argv == NULL){

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return NULL;

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}

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}

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free(plugin_node);

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argv[0] = NULL; /* Will be set to argv[0] in main before

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parsing */

259

argv[1] = NULL;

260

}

261

*argc += 1;

262

argv = realloc(argv, sizeof(char *)

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* ((unsigned int) *argc + 1));

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if(argv == NULL){

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return NULL;

266

}

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argv[*argc-1] = arg;

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argv[*argc] = NULL;

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return argv;

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}

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static void free_plugin_list(void){

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while(plugin_list != NULL){

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free_plugin(plugin_list);

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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(*arg);

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}

278

free(plugin_list->argv);

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for(char **env = plugin_list->environ; *env != NULL; env++){

280

free(*env);

281

}

282

free(plugin_list->environ);

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free(plugin_list);

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}

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285

}

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int main(int argc, char *argv[]){

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char *plugindir = NULL;

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char *argfile = NULL;

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const char *plugindir = "/lib/mandos/plugins.d";

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const char *argfile = ARGFILE;

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FILE *conffp;

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size_t d_name_len;

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DIR *dir = NULL;

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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-env", .key = 'G',

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{ .name = "global-envs", .key = 'e',

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.arg = "VAR=value",

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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 = "env-for", .key = 'E',

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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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.arg = "PLUGIN",

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.doc = "Disable a specific plugin", .group = 1 },

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{ .name = "enable", .key = 'e',

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.arg = "PLUGIN",

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.doc = "Enable a specific plugin", .group = 1 },

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{ .name = "plugin-dir", .key = 128,

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.arg = "DIRECTORY",

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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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.arg = "FILE",

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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 },

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{ .name = "userid", .key = 129,

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.arg = "ID", .flags = 0,

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.doc = "User ID the plugins will run as", .group = 2 },

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{ .name = "groupid", .key = 130,

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.arg = "ID", .flags = 0,

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.doc = "Group ID the plugins will run as", .group = 2 },

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{ .name = "debug", .key = 131,

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.doc = "Debug mode", .group = 3 },

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{ .name = NULL }

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};

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

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struct argp_state *state) {

353

error_t parse_opt (int key, char *arg, struct argp_state *state) {

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/* Get the INPUT argument from `argp_parse', which we know is a

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pointer to our plugin list pointer. */

356

plugin **plugins = state->input;

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switch (key) {

379

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

358

case 'g':

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359

if (arg != NULL){

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360

char *p;

382

361

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

383

362

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

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363

continue;

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364

}

386

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

365

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

387

366

perror("add_argument");

388

367

return ARGP_ERR_UNKNOWN;

389

368

}

390

369

}

391

370

}

392

371

break;

393

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

372

case 'e':

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373

if(arg == NULL){

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374

break;

396

375

}

397

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

398

perror("add_environment");

376

{

377

char *envdef = strdup(arg);

378

if(envdef == NULL){

379

break;

380

}

381

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

382

perror("add_environment");

383

}

399

384

}

400

385

break;

401

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

386

case 'o':

402

387

if (arg != NULL){

403

388

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

404

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

389

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

405

390

break;

406

391

}

407

392

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

408

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

393

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

409

394

break;

410

395

}

411

char *p;

412

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

413

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

414

continue;

415

}

416

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

417

perror("add_argument");

418

return ARGP_ERR_UNKNOWN;

396

if(opt != NULL){

397

char *p;

398

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

399

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

400

continue;

401

}

402

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

403

perror("add_argument");

404

return ARGP_ERR_UNKNOWN;

405

}

419

406

}

420

407

}

421

408

}

422

409

break;

423

case 'E': /* --env-for */

410

case 'f':

424

411

if(arg == NULL){

425

412

break;

426

413

}

429

416

if(envdef == NULL){

430

417

break;

431

418

}

432

*envdef = '\0';

433

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

419

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

420

if(p_name == NULL){

421

break;

422

}

423

envdef++;

424

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

434

425

perror("add_environment");

435

426

}

436

427

}

437

428

break;

438

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

429

case 'd':

439

430

if (arg != NULL){

440

plugin *p = getplugin(arg);

431

plugin *p = getplugin(arg, plugins);

441

432

if(p == NULL){

442

433

return ARGP_ERR_UNKNOWN;

443

434

}

444

435

p->disabled = true;

445

436

}

446

437

break;

447

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

448

if (arg != NULL){

449

plugin *p = getplugin(arg);

450

if(p == NULL){

451

return ARGP_ERR_UNKNOWN;

452

}

453

p->disabled = false;

454

}

455

break;

456

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

457

free(plugindir);

458

plugindir = strdup(arg);

459

if(plugindir == NULL){

460

perror("strdup");

461

}

462

break;

463

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

464

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

465

break;

466

case 130: /* --userid */

438

case 128:

439

plugindir = arg;

440

break;

441

case 129:

467

442

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

468

443

break;

469

case 131: /* --groupid */

444

case 130:

470

445

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

471

446

break;

472

case 132: /* --debug */

447

case 131:

473

448

debug = true;

474

449

break;

475

450

case ARGP_KEY_ARG:

483

458

return 0;

484

459

}

485

460

486

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

487

ignores everything but the --config-file option. */

488

error_t parse_opt_config_file (int key, char *arg,

489

__attribute__((unused))

490

struct argp_state *state) {

491

switch (key) {

492

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

493

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

494

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

495

case 'E': /* --env-for */

496

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

497

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

498

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

499

break;

500

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

501

free(argfile);

502

argfile = strdup(arg);

503

if(argfile == NULL){

504

perror("strdup");

505

}

506

break;

507

case 130: /* --userid */

508

case 131: /* --groupid */

509

case 132: /* --debug */

510

case ARGP_KEY_ARG:

511

case ARGP_KEY_END:

512

break;

513

default:

514

return ARGP_ERR_UNKNOWN;

515

}

516

return 0;

517

}

461

plugin *plugin_list = NULL;

518

462

519

struct argp argp = { .options = options,

520

.parser = parse_opt_config_file,

521

.args_doc = "",

463

struct argp argp = { .options = options, .parser = parse_opt,

464

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

522

465

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

523

466

524

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

525

config file location, if any. */

526

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

467

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

527

468

if (ret == ARGP_ERR_UNKNOWN){

528

469

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

529

470

exitstatus = EXIT_FAILURE;

530

471

goto fallback;

531

472

}

532

533

/* Reset to the normal argument parser */

534

argp.parser = parse_opt;

535

536

/* Open the configfile if available */

537

if (argfile == NULL){

538

conffp = fopen(AFILE, "r");

539

} else {

540

conffp = fopen(argfile, "r");

541

}

473

474

conffp = fopen(argfile, "r");

542

475

if(conffp != NULL){

543

476

char *org_line = NULL;

544

477

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

547

480

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

548

481

const char comment_delim[] = "#";

549

482

550

custom_argc = 1;

551

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

552

if(custom_argv == NULL){

553

perror("malloc");

554

exitstatus = EXIT_FAILURE;

555

goto fallback;

556

}

557

custom_argv[0] = argv[0];

558

custom_argv[1] = NULL;

559

560

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

561

commented text */

562

483

while(true){

563

484

sret = getline(&org_line, &size, conffp);

564

485

if(sret == -1){

572

493

continue;

573

494

}

574

495

new_arg = strdup(p);

575

if(new_arg == NULL){

576

perror("strdup");

577

exitstatus = EXIT_FAILURE;

578

free(org_line);

579

goto fallback;

580

}

581

582

custom_argc += 1;

583

custom_argv = realloc(custom_argv, sizeof(char *)

584

* ((unsigned int) custom_argc + 1));

585

if(custom_argv == NULL){

586

perror("realloc");

587

exitstatus = EXIT_FAILURE;

588

free(org_line);

589

goto fallback;

590

}

591

custom_argv[custom_argc-1] = new_arg;

592

custom_argv[custom_argc] = NULL;

496

custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);

497

if (custom_argv == NULL){

498

perror("add_to_argv");

499

exitstatus = EXIT_FAILURE;

500

goto fallback;

501

}

593

502

}

594

503

}

595

504

free(org_line);

596

} else {

505

} else{

597

506

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

598

507

not affect opening plugins */

599

508

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

602

511

goto fallback;

603

512

}

604

513

}

605

/* If there was any arguments from configuration file,

606

pass them to parser as command arguments */

514

607

515

if(custom_argv != NULL){

608

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

609

0, NULL);

516

custom_argv[0] = argv[0];

517

ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0,

518

&plugin_list);

610

519

if (ret == ARGP_ERR_UNKNOWN){

611

520

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

612

521

exitstatus = EXIT_FAILURE;

614

523

}

615

524

}

616

525

617

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

618

config file */

619

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

620

if (ret == ARGP_ERR_UNKNOWN){

621

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

622

exitstatus = EXIT_FAILURE;

623

goto fallback;

624

}

625

626

526

if(debug){

627

527

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

628

528

fprintf(stderr, "Plugin: %s has %d arguments\n",

637

537

}

638

538

}

639

539

640

/* Strip permissions down to nobody */

641

540

ret = setuid(uid);

642

541

if (ret == -1){

643

542

perror("setuid");

644

}

543

}

544

645

545

setgid(gid);

646

546

if (ret == -1){

647

547

perror("setgid");

648

548

}

649

549

650

if (plugindir == NULL){

651

dir = opendir(PDIR);

652

} else {

653

dir = opendir(plugindir);

654

}

655

550

dir = opendir(plugindir);

656

551

if(dir == NULL){

657

552

perror("Could not open plugin dir");

658

553

exitstatus = EXIT_FAILURE;

674

569

675

570

FD_ZERO(&rfds_all);

676

571

677

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

678

572

while(true){

679

573

dirst = readdir(dir);

680

574

681

/* All directory entries have been processed */

575

// All directory entries have been processed

682

576

if(dirst == NULL){

683

577

if (errno == EBADF){

684

578

perror("readdir");

690

584

691

585

d_name_len = strlen(dirst->d_name);

692

586

693

/* Ignore dotfiles, backup files and other junk */

587

// Ignore dotfiles, backup files and other junk

694

588

{

695

589

bool bad_name = false;

696

590

711

605

break;

712

606

}

713

607

}

608

714

609

if(bad_name){

715

610

continue;

716

611

}

612

717

613

for(const char **suf = bad_suffixes; *suf != NULL; suf++){

718

614

size_t suf_len = strlen(*suf);

719

615

if((d_name_len >= suf_len)

734

630

}

735

631

736

632

char *filename;

737

if(plugindir == NULL){

738

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

739

} else {

740

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

741

}

633

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

742

634

if(ret < 0){

743

635

perror("asprintf");

744

636

continue;

750

642

free(filename);

751

643

continue;

752

644

}

753

754

/* Ignore non-executable files */

645

755

646

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

756

647

if(debug){

757

648

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

760

651

free(filename);

761

652

continue;

762

653

}

763

764

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

654

plugin *p = getplugin(dirst->d_name, &plugin_list);

765

655

if(p == NULL){

766

656

perror("getplugin");

767

657

free(filename);

777

667

}

778

668

{

779

669

/* Add global arguments to argument list for this plugin */

780

plugin *g = getplugin(NULL);

670

plugin *g = getplugin(NULL, &plugin_list);

781

671

if(g != NULL){

782

672

for(char **a = g->argv + 1; *a != NULL; a++){

783

673

if(not add_argument(p, *a)){

786

676

}

787

677

/* Add global environment variables */

788

678

for(char **e = g->environ; *e != NULL; e++){

789

if(not add_environment(p, *e, false)){

679

if(not add_environment(p, *e)){

790

680

perror("add_environment");

791

681

}

792

682

}

797

687

process, too. */

798

688

if(p->environ[0] != NULL){

799

689

for(char **e = environ; *e != NULL; e++){

800

if(not add_environment(p, *e, false)){

690

char *copy = strdup(*e);

691

if(copy == NULL){

692

perror("strdup");

693

continue;

694

}

695

if(not add_environment(p, copy)){

801

696

perror("add_environment");

802

697

}

803

698

}

810

705

exitstatus = EXIT_FAILURE;

811

706

goto fallback;

812

707

}

813

/* Ask OS to automatic close the pipe on exec */

814

708

ret = set_cloexec_flag(pipefd[0]);

815

709

if(ret < 0){

816

710

perror("set_cloexec_flag");

830

724

exitstatus = EXIT_FAILURE;

831

725

goto fallback;

832

726

}

833

/* Starting a new process to be watched */

727

// Starting a new process to be watched

834

728

pid_t pid = fork();

835

729

if(pid == -1){

836

730

perror("fork");

874

768

}

875

769

/* no return */

876

770

}

877

/* Parent process */

878

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

771

/* parent process */

879

772

free(filename);

880

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

881

if (new_plugin == NULL){

882

perror("getplugin");

773

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

774

process *new_process = malloc(sizeof(process));

775

if (new_process == NULL){

776

perror("malloc");

883

777

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

884

778

if(ret < 0){

885

perror("sigprocmask");

779

perror("sigprocmask");

886

780

}

887

781

exitstatus = EXIT_FAILURE;

888

782

goto fallback;

889

783

}

890

784

891

new_plugin->pid = pid;

892

new_plugin->fd = pipefd[0];

893

785

*new_process = (struct process){ .pid = pid,

786

.fd = pipefd[0],

787

.next = process_list };

788

// List handling

789

process_list = new_process;

894

790

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

895

791

has already completed */

896

792

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

900

796

goto fallback;

901

797

}

902

798

903

FD_SET(new_plugin->fd, &rfds_all);

799

FD_SET(new_process->fd, &rfds_all);

904

800

905

if (maxfd < new_plugin->fd){

906

maxfd = new_plugin->fd;

801

if (maxfd < new_process->fd){

802

maxfd = new_process->fd;

907

803

}

908

804

909

805

}

910

806

807

free_plugin_list(plugin_list);

808

plugin_list = NULL;

809

911

810

closedir(dir);

912

811

dir = NULL;

913

914

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

915

if(p->pid != 0){

916

break;

917

}

918

if(p->next == NULL){

919

fprintf(stderr, "No plugin processes started. Incorrect plugin"

920

" directory?\n");

921

free_plugin_list();

922

}

812

813

if (process_list == NULL){

814

fprintf(stderr, "No plugin processes started. Incorrect plugin"

815

" directory?\n");

816

process_list = NULL;

923

817

}

924

925

/* Main loop while running plugins exist */

926

while(plugin_list){

818

while(process_list){

927

819

fd_set rfds = rfds_all;

928

820

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

929

821

if (select_ret == -1){

933

825

}

934

826

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

935

827

from one of them */

936

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

828

for(process *proc = process_list; proc ; proc = proc->next){

937

829

/* Is this process completely done? */

938

830

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

939

831

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

940

832

if(not WIFEXITED(proc->status)

941

833

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

942

834

/* Bad exit by plugin */

943

944

835

if(debug){

945

836

if(WIFEXITED(proc->status)){

946

837

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

955

846

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

956

847

}

957

848

}

958

959

849

/* Remove the plugin */

960

850

FD_CLR(proc->fd, &rfds_all);

961

962

851

/* Block signal while modifying process_list */

963

852

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

964

853

if(ret < 0){

966

855

exitstatus = EXIT_FAILURE;

967

856

goto fallback;

968

857

}

969

858

/* Delete this process entry from the list */

859

if(process_list == proc){

860

/* First one - simple */

861

process_list = proc->next;

862

} else {

863

/* Second one or later */

864

for(process *p = process_list; p != NULL; p = p->next){

865

if(p->next == proc){

866

p->next = proc->next;

867

break;

868

}

869

}

870

}

970

871

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

971

872

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

972

873

NULL);

973

874

if(ret < 0){

974

875

perror("sigprocmask");

975

exitstatus = EXIT_FAILURE;

976

goto fallback;

977

}

978

979

if(plugin_list == NULL){

980

break;

981

}

982

983

plugin *next_plugin = proc->next;

984

free_plugin(proc);

985

proc = next_plugin;

986

continue;

876

}

877

free(proc->buffer);

878

free(proc);

879

/* We deleted this process from the list, so we can't go

880

proc->next. Therefore, start over from the beginning of

881

the process list */

882

break;

987

883

}

988

989

884

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

990

885

991

886

bool bret = print_out_password(proc->buffer,

996

891

}

997

892

goto fallback;

998

893

}

999

1000

894

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

1001

895

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

1002

896

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

1003

proc = proc->next;

1004

897

continue;

1005

898

}

1006

899

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

1019

912

BUFFER_SIZE);

1020

913

if(ret < 0){

1021

914

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

1022

proc = proc->next;

1023

915

continue;

1024

916

}

1025

917

if(ret == 0){

1034

926

1035

927

fallback:

1036

928

1037

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

929

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

1038

930

/* Fallback if all plugins failed, none are found or an error

1039

931

occured */

1040

932

bool bret;

1041

933

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

1042

934

char *passwordbuffer = getpass("Password: ");

1043

size_t len = strlen(passwordbuffer);

1044

/* Strip trailing newline */

1045

if(len > 0 and passwordbuffer[len-1] == '\n'){

1046

passwordbuffer[len-1] = '\0'; /* not strictly necessary */

1047

len--;

1048

}

1049

bret = print_out_password(passwordbuffer, len);

935

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

1050

936

if(not bret){

1051

937

perror("print_out_password");

1052

938

exitstatus = EXIT_FAILURE;

1061

947

}

1062

948

1063

949

if(custom_argv != NULL){

1064

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

950

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

1065

951

free(*arg);

1066

952

}

1067

953

free(custom_argv);

1068

954

}

955

free_plugin_list(plugin_list);

1069

956

1070

957

if(dir != NULL){

1071

958

closedir(dir);

1072

959

}

1073

960

1074

961

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

1075

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

1076

if(p->pid != 0){

1077

close(p->fd);

1078

ret = kill(p->pid, SIGTERM);

1079

if(ret == -1 and errno != ESRCH){

1080

/* Set-uid proccesses might not get closed */

1081

perror("kill");

1082

}

962

for(process *next; process_list != NULL; process_list = next){

963

next = process_list->next;

964

close(process_list->fd);

965

ret = kill(process_list->pid, SIGTERM);

966

if(ret == -1 and errno != ESRCH){

967

/* set-uid proccesses migth not get closed */

968

perror("kill");

1083

969

}

970

free(process_list->buffer);

971

free(process_list);

1084

972

}

1085

973

1086

974

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

1090

978

if(errno != ECHILD){

1091

979

perror("wait");

1092

980

}

1093

1094

free_plugin_list();

1095

1096

free(plugindir);

1097

free(argfile);

1098

981

1099

982

return exitstatus;

1100

983

}