/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 */

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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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if(p == NULL){

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return false;

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}

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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 */

282

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 {

286

/* 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){

289

p->next = plugin_node->next;

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break;

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}

250

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

251

if (argv == NULL){

252

*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));

264

if(argv == NULL){

265

return NULL;

266

}

267

argv[*argc-1] = arg;

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argv[*argc] = NULL;

269

return argv;

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}

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static void free_plugin_list(void){

299

while(plugin_list != NULL){

300

free_plugin(plugin_list);

272

static void free_plugin_list(plugin *plugin_list){

273

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++){

276

free(*arg);

277

}

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);

283

free(plugin_list);

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}

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285

}

303

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304

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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 },

356

{ .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))

377

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;

378

357

switch (key) {

379

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

358

case 'g':

380

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){

395

374

break;

396

375

}

399

378

if(envdef == NULL){

400

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break;

401

380

}

402

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

381

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

403

382

perror("add_environment");

404

383

}

405

384

}

406

385

break;

407

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

386

case 'o':

408

387

if (arg != NULL){

409

388

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

410

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

389

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

411

390

break;

412

391

}

413

392

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

414

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

393

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

415

394

break;

416

395

}

417

char *p;

418

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

419

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

420

continue;

421

}

422

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

423

perror("add_argument");

424

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

}

425

406

}

426

407

}

427

408

}

428

409

break;

429

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

410

case 'f':

430

411

if(arg == NULL){

431

412

break;

432

413

}

440

421

break;

441

422

}

442

423

envdef++;

443

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

424

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

444

425

perror("add_environment");

445

426

}

446

427

}

447

428

break;

448

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

429

case 'd':

449

430

if (arg != NULL){

450

plugin *p = getplugin(arg);

431

plugin *p = getplugin(arg, plugins);

451

432

if(p == NULL){

452

433

return ARGP_ERR_UNKNOWN;

453

434

}

454

435

p->disabled = true;

455

436

}

456

437

break;

457

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

458

if (arg != NULL){

459

plugin *p = getplugin(arg);

460

if(p == NULL){

461

return ARGP_ERR_UNKNOWN;

462

}

463

p->disabled = false;

464

}

465

break;

466

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

467

plugindir = strdup(arg);

468

if(plugindir == NULL){

469

perror("strdup");

470

}

471

break;

472

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

473

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

474

break;

475

case 130: /* --userid */

438

case 128:

439

plugindir = arg;

440

break;

441

case 129:

476

442

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

477

443

break;

478

case 131: /* --groupid */

444

case 130:

479

445

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

480

446

break;

481

case 132: /* --debug */

447

case 131:

482

448

debug = true;

483

449

break;

484

450

case ARGP_KEY_ARG:

492

458

return 0;

493

459

}

494

460

495

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

496

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

497

error_t parse_opt_config_file (int key, char *arg,

498

__attribute__((unused))

499

struct argp_state *state) {

500

switch (key) {

501

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

502

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

503

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

504

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

505

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

506

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

507

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

508

break;

509

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

510

argfile = strdup(arg);

511

if(argfile == NULL){

512

perror("strdup");

513

}

514

break;

515

case 130: /* --userid */

516

case 131: /* --groupid */

517

case 132: /* --debug */

518

case ARGP_KEY_ARG:

519

case ARGP_KEY_END:

520

break;

521

default:

522

return ARGP_ERR_UNKNOWN;

523

}

524

return 0;

525

}

461

plugin *plugin_list = NULL;

526

462

527

struct argp argp = { .options = options,

528

.parser = parse_opt_config_file,

529

.args_doc = "",

463

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

464

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

530

465

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

531

466

532

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

533

config file location, if any. */

534

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

467

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

535

468

if (ret == ARGP_ERR_UNKNOWN){

536

469

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

537

470

exitstatus = EXIT_FAILURE;

538

471

goto fallback;

539

472

}

540

541

/* Reset to the normal argument parser */

542

argp.parser = parse_opt;

543

544

/* Open the configfile if available */

545

if (argfile == NULL){

546

conffp = fopen(AFILE, "r");

547

} else {

548

conffp = fopen(argfile, "r");

549

}

473

474

conffp = fopen(argfile, "r");

550

475

if(conffp != NULL){

551

476

char *org_line = NULL;

552

477

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

555

480

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

556

481

const char comment_delim[] = "#";

557

482

558

custom_argc = 1;

559

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

560

if(custom_argv == NULL){

561

perror("malloc");

562

exitstatus = EXIT_FAILURE;

563

goto fallback;

564

}

565

custom_argv[0] = argv[0];

566

custom_argv[1] = NULL;

567

568

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

569

commented text */

570

483

while(true){

571

484

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

572

485

if(sret == -1){

580

493

continue;

581

494

}

582

495

new_arg = strdup(p);

583

if(new_arg == NULL){

584

perror("strdup");

585

exitstatus = EXIT_FAILURE;

586

free(org_line);

587

goto fallback;

588

}

589

590

custom_argc += 1;

591

custom_argv = realloc(custom_argv, sizeof(char *)

592

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

593

if(custom_argv == NULL){

594

perror("realloc");

595

exitstatus = EXIT_FAILURE;

596

free(org_line);

597

goto fallback;

598

}

599

custom_argv[custom_argc-1] = new_arg;

600

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

}

601

502

}

602

503

}

603

504

free(org_line);

604

} else {

505

} else{

605

506

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

606

507

not affect opening plugins */

607

508

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

610

511

goto fallback;

611

512

}

612

513

}

613

/* If there was any arguments from configuration file,

614

pass them to parser as command arguments */

514

615

515

if(custom_argv != NULL){

616

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

617

0, NULL);

516

custom_argv[0] = argv[0];

517

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

518

&plugin_list);

618

519

if (ret == ARGP_ERR_UNKNOWN){

619

520

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

620

521

exitstatus = EXIT_FAILURE;

622

523

}

623

524

}

624

525

625

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

626

config file */

627

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

628

if (ret == ARGP_ERR_UNKNOWN){

629

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

630

exitstatus = EXIT_FAILURE;

631

goto fallback;

632

}

633

634

526

if(debug){

635

527

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

636

528

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

645

537

}

646

538

}

647

539

648

/* Strip permissions down to nobody */

649

540

ret = setuid(uid);

650

541

if (ret == -1){

651

542

perror("setuid");

652

}

543

}

544

653

545

setgid(gid);

654

546

if (ret == -1){

655

547

perror("setgid");

656

548

}

657

549

658

if (plugindir == NULL){

659

dir = opendir(PDIR);

660

} else {

661

dir = opendir(plugindir);

662

}

663

550

dir = opendir(plugindir);

664

551

if(dir == NULL){

665

552

perror("Could not open plugin dir");

666

553

exitstatus = EXIT_FAILURE;

682

569

683

570

FD_ZERO(&rfds_all);

684

571

685

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

686

572

while(true){

687

573

dirst = readdir(dir);

688

574

689

/* All directory entries have been processed */

575

// All directory entries have been processed

690

576

if(dirst == NULL){

691

577

if (errno == EBADF){

692

578

perror("readdir");

698

584

699

585

d_name_len = strlen(dirst->d_name);

700

586

701

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

587

// Ignore dotfiles, backup files and other junk

702

588

{

703

589

bool bad_name = false;

704

590

719

605

break;

720

606

}

721

607

}

608

722

609

if(bad_name){

723

610

continue;

724

611

}

612

725

613

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

726

614

size_t suf_len = strlen(*suf);

727

615

if((d_name_len >= suf_len)

742

630

}

743

631

744

632

char *filename;

745

if(plugindir == NULL){

746

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

747

} else {

748

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

749

}

633

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

750

634

if(ret < 0){

751

635

perror("asprintf");

752

636

continue;

758

642

free(filename);

759

643

continue;

760

644

}

761

762

/* Ignore non-executable files */

645

763

646

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

764

647

if(debug){

765

648

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

768

651

free(filename);

769

652

continue;

770

653

}

771

772

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

654

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

773

655

if(p == NULL){

774

656

perror("getplugin");

775

657

free(filename);

785

667

}

786

668

{

787

669

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

788

plugin *g = getplugin(NULL);

670

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

789

671

if(g != NULL){

790

672

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

791

673

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

794

676

}

795

677

/* Add global environment variables */

796

678

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

797

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

679

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

798

680

perror("add_environment");

799

681

}

800

682

}

805

687

process, too. */

806

688

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

807

689

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

808

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)){

809

696

perror("add_environment");

810

697

}

811

698

}

818

705

exitstatus = EXIT_FAILURE;

819

706

goto fallback;

820

707

}

821

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

822

708

ret = set_cloexec_flag(pipefd[0]);

823

709

if(ret < 0){

824

710

perror("set_cloexec_flag");

838

724

exitstatus = EXIT_FAILURE;

839

725

goto fallback;

840

726

}

841

/* Starting a new process to be watched */

727

// Starting a new process to be watched

842

728

pid_t pid = fork();

843

729

if(pid == -1){

844

730

perror("fork");

882

768

}

883

769

/* no return */

884

770

}

885

/* Parent process */

886

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

771

/* parent process */

887

772

free(filename);

888

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

889

if (new_plugin == NULL){

890

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");

891

777

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

892

778

if(ret < 0){

893

perror("sigprocmask");

779

perror("sigprocmask");

894

780

}

895

781

exitstatus = EXIT_FAILURE;

896

782

goto fallback;

897

783

}

898

784

899

new_plugin->pid = pid;

900

new_plugin->fd = pipefd[0];

901

785

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

786

.fd = pipefd[0],

787

.next = process_list };

788

// List handling

789

process_list = new_process;

902

790

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

903

791

has already completed */

904

792

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

908

796

goto fallback;

909

797

}

910

798

911

FD_SET(new_plugin->fd, &rfds_all);

799

FD_SET(new_process->fd, &rfds_all);

912

800

913

if (maxfd < new_plugin->fd){

914

maxfd = new_plugin->fd;

801

if (maxfd < new_process->fd){

802

maxfd = new_process->fd;

915

803

}

916

804

917

805

}

918

806

807

free_plugin_list(plugin_list);

808

plugin_list = NULL;

809

919

810

closedir(dir);

920

811

dir = NULL;

921

922

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

923

if(p->pid != 0){

924

break;

925

}

926

if(p->next == NULL){

927

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

928

" directory?\n");

929

free_plugin_list();

930

}

812

813

if (process_list == NULL){

814

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

815

" directory?\n");

816

process_list = NULL;

931

817

}

932

933

/* Main loop while running plugins exist */

934

while(plugin_list){

818

while(process_list){

935

819

fd_set rfds = rfds_all;

936

820

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

937

821

if (select_ret == -1){

941

825

}

942

826

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

943

827

from one of them */

944

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

828

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

945

829

/* Is this process completely done? */

946

830

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

947

831

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

948

832

if(not WIFEXITED(proc->status)

949

833

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

950

834

/* Bad exit by plugin */

951

952

835

if(debug){

953

836

if(WIFEXITED(proc->status)){

954

837

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

963

846

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

964

847

}

965

848

}

966

967

849

/* Remove the plugin */

968

850

FD_CLR(proc->fd, &rfds_all);

969

970

851

/* Block signal while modifying process_list */

971

852

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

972

853

if(ret < 0){

974

855

exitstatus = EXIT_FAILURE;

975

856

goto fallback;

976

857

}

977

free_plugin(proc);

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

}

978

871

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

979

872

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

980

873

NULL);

981

874

if(ret < 0){

982

875

perror("sigprocmask");

983

exitstatus = EXIT_FAILURE;

984

goto fallback;

985

}

986

987

if(plugin_list == NULL){

988

break;

989

}

990

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;

991

883

}

992

993

884

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

994

885

995

886

bool bret = print_out_password(proc->buffer,

1000

891

}

1001

892

goto fallback;

1002

893

}

1003

1004

894

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

1005

895

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

1006

896

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

1036

926

1037

927

fallback:

1038

928

1039

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

929

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

1040

930

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

1041

931

occured */

1042

932

bool bret;

1043

933

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

1044

934

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

1045

size_t len = strlen(passwordbuffer);

1046

/* Strip trailing newline */

1047

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

1048

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

1049

len--;

1050

}

1051

bret = print_out_password(passwordbuffer, len);

935

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

1052

936

if(not bret){

1053

937

perror("print_out_password");

1054

938

exitstatus = EXIT_FAILURE;

1063

947

}

1064

948

1065

949

if(custom_argv != NULL){

1066

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

950

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

1067

951

free(*arg);

1068

952

}

1069

953

free(custom_argv);

1070

954

}

955

free_plugin_list(plugin_list);

1071

956

1072

957

if(dir != NULL){

1073

958

closedir(dir);

1074

959

}

1075

960

1076

961

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

1077

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

1078

if(p->pid != 0){

1079

close(p->fd);

1080

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

1081

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

1082

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

1083

perror("kill");

1084

}

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");

1085

969

}

970

free(process_list->buffer);

971

free(process_list);

1086

972

}

1087

973

1088

974

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

1092

978

if(errno != ECHILD){

1093

979

perror("wait");

1094

980

}

1095

1096

free_plugin_list();

1097

1098

free(plugindir);

1099

free(argfile);

1100

981

1101

982

return exitstatus;

1102

983

}