/mandos/trunk : revision 171

65

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

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#define BUFFER_SIZE 256

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

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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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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 process;

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typedef struct process{

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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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pid_t pid;

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int fd;

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char *buffer;

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91

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;

91

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

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

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static plugin *plugin_list = NULL;

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/* Gets an existing plugin based on name,

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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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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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132

}

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new_plugin->argv[0] = copy_name;

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new_plugin->argv[1] = NULL;

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132

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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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148

}

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174

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}

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/* Add to a plugin's environment */

177

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

182

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

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183

if(p == NULL){

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184

return false;

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185

}

186

/* 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){

191

/* It already exists */

192

if(replace){

193

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

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if(new == NULL){

195

return false;

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}

197

*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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process *proc = process_list;

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plugin *proc = plugin_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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257

ssize_t ret;

237

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

238

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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}

249

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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);

254

if(argv == NULL){

255

return NULL;

268

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

269

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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}

274

free(plugin_node->argv);

275

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

276

free(*env);

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}

278

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){

283

/* First one - simple */

284

plugin_list = plugin_list->next;

285

} else {

286

/* Second one or later */

287

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

288

if(p->next == plugin_node){

289

p->next = plugin_node->next;

290

break;

291

}

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292

}

257

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

258

parsing */

259

argv[1] = NULL;

260

}

261

*argc += 1;

262

argv = realloc(argv, sizeof(char *)

263

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

264

if(argv == NULL){

265

return NULL;

266

}

267

argv[*argc-1] = arg;

268

argv[*argc] = NULL;

269

return argv;

293

}

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free(plugin_node);

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}

271

297

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static void free_plugin_list(plugin *plugin_list){

273

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

274

next = plugin_list->next;

275

for(char **arg = plugin_list->argv; *arg != NULL; arg++){

276

free(*arg);

277

}

278

free(plugin_list->argv);

279

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

280

free(*env);

281

}

282

free(plugin_list->environ);

283

free(plugin_list);

298

static void free_plugin_list(void){

299

while(plugin_list != NULL){

300

free_plugin(plugin_list);

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}

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302

}

286

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287

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

288

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

289

const char *argfile = ARGFILE;

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char *plugindir = NULL;

306

char *argfile = NULL;

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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-envs", .key = 'e',

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{ .name = "global-env", .key = 'G',

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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 = "envs-for", .key = 'f',

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

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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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355

.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 },

342

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

343

.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,

346

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

347

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

348

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

349

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

362

{ .name = "config-file", .key = 129,

363

.arg = "FILE",

364

.doc = "Specify a different configuration file", .group = 2 },

365

{ .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 },

371

{ .name = "debug", .key = 132,

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.doc = "Debug mode", .group = 4 },

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{ .name = NULL }

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374

};

352

375

353

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

354

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

355

pointer to our plugin list pointer. */

356

plugin **plugins = state->input;

376

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

377

struct argp_state *state) {

357

378

switch (key) {

358

case 'g':

379

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

359

380

if (arg != NULL){

360

381

char *p;

361

382

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

362

383

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

363

384

continue;

364

385

}

365

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

386

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

366

387

perror("add_argument");

367

388

return ARGP_ERR_UNKNOWN;

368

389

}

369

390

}

370

391

}

371

392

break;

372

case 'e':

393

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

373

394

if(arg == NULL){

374

395

break;

375

396

}

378

399

if(envdef == NULL){

379

400

break;

380

401

}

381

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

402

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

382

403

perror("add_environment");

383

404

}

384

405

}

385

406

break;

386

case 'o':

407

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

387

408

if (arg != NULL){

388

409

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

389

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

410

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

390

411

break;

391

412

}

392

413

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

393

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

414

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

394

415

break;

395

416

}

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

}

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;

406

425

}

407

426

}

408

427

}

409

428

break;

410

case 'f':

429

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

411

430

if(arg == NULL){

412

431

break;

413

432

}

421

440

break;

422

441

}

423

442

envdef++;

424

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

443

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

425

444

perror("add_environment");

426

445

}

427

446

}

428

447

break;

429

case 'd':

448

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

430

449

if (arg != NULL){

431

plugin *p = getplugin(arg, plugins);

450

plugin *p = getplugin(arg);

432

451

if(p == NULL){

433

452

return ARGP_ERR_UNKNOWN;

434

453

}

435

454

p->disabled = true;

436

455

}

437

456

break;

438

case 128:

439

plugindir = arg;

440

break;

441

case 129:

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 */

442

476

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

443

477

break;

444

case 130:

478

case 131: /* --groupid */

445

479

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

446

480

break;

447

case 131:

481

case 132: /* --debug */

448

482

debug = true;

449

483

break;

450

484

case ARGP_KEY_ARG:

458

492

return 0;

459

493

}

460

494

461

plugin *plugin_list = NULL;

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

}

462

526

463

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

464

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

527

struct argp argp = { .options = options,

528

.parser = parse_opt_config_file,

529

.args_doc = "",

465

530

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

466

531

467

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

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);

468

535

if (ret == ARGP_ERR_UNKNOWN){

469

536

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

470

537

exitstatus = EXIT_FAILURE;

471

538

goto fallback;

472

539

}

473

474

conffp = fopen(argfile, "r");

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

}

475

550

if(conffp != NULL){

476

551

char *org_line = NULL;

477

552

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

480

555

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

481

556

const char comment_delim[] = "#";

482

557

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 */

483

570

while(true){

484

571

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

485

572

if(sret == -1){

493

580

continue;

494

581

}

495

582

new_arg = strdup(p);

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

}

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;

502

601

}

503

602

}

504

603

free(org_line);

505

} else{

604

} else {

506

605

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

507

606

not affect opening plugins */

508

607

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

511

610

goto fallback;

512

611

}

513

612

}

514

613

/* If there was any arguments from configuration file,

614

pass them to parser as command arguments */

515

615

if(custom_argv != NULL){

516

custom_argv[0] = argv[0];

517

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

518

&plugin_list);

616

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

617

0, NULL);

519

618

if (ret == ARGP_ERR_UNKNOWN){

520

619

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

521

620

exitstatus = EXIT_FAILURE;

523

622

}

524

623

}

525

624

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

526

634

if(debug){

527

635

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

528

636

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

537

645

}

538

646

}

539

647

648

/* Strip permissions down to nobody */

540

649

ret = setuid(uid);

541

650

if (ret == -1){

542

651

perror("setuid");

543

}

544

652

}

545

653

setgid(gid);

546

654

if (ret == -1){

547

655

perror("setgid");

548

656

}

549

657

550

dir = opendir(plugindir);

658

if (plugindir == NULL){

659

dir = opendir(PDIR);

660

} else {

661

dir = opendir(plugindir);

662

}

663

551

664

if(dir == NULL){

552

665

perror("Could not open plugin dir");

553

666

exitstatus = EXIT_FAILURE;

569

682

570

683

FD_ZERO(&rfds_all);

571

684

685

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

572

686

while(true){

573

687

dirst = readdir(dir);

574

688

575

// All directory entries have been processed

689

/* All directory entries have been processed */

576

690

if(dirst == NULL){

577

691

if (errno == EBADF){

578

692

perror("readdir");

584

698

585

699

d_name_len = strlen(dirst->d_name);

586

700

587

// Ignore dotfiles, backup files and other junk

701

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

588

702

{

589

703

bool bad_name = false;

590

704

605

719

break;

606

720

}

607

721

}

608

609

722

if(bad_name){

610

723

continue;

611

724

}

612

613

725

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

614

726

size_t suf_len = strlen(*suf);

615

727

if((d_name_len >= suf_len)

630

742

}

631

743

632

744

char *filename;

633

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

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

}

634

750

if(ret < 0){

635

751

perror("asprintf");

636

752

continue;

642

758

free(filename);

643

759

continue;

644

760

}

645

761

762

/* Ignore non-executable files */

646

763

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

647

764

if(debug){

648

765

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

651

768

free(filename);

652

769

continue;

653

770

}

654

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

771

772

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

655

773

if(p == NULL){

656

774

perror("getplugin");

657

775

free(filename);

667

785

}

668

786

{

669

787

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

670

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

788

plugin *g = getplugin(NULL);

671

789

if(g != NULL){

672

790

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

673

791

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

676

794

}

677

795

/* Add global environment variables */

678

796

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

679

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

797

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

680

798

perror("add_environment");

681

799

}

682

800

}

687

805

process, too. */

688

806

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

689

807

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

690

char *copy = strdup(*e);

691

if(copy == NULL){

692

perror("strdup");

693

continue;

694

}

695

if(not add_environment(p, copy)){

808

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

696

809

perror("add_environment");

697

810

}

698

811

}

705

818

exitstatus = EXIT_FAILURE;

706

819

goto fallback;

707

820

}

821

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

708

822

ret = set_cloexec_flag(pipefd[0]);

709

823

if(ret < 0){

710

824

perror("set_cloexec_flag");

724

838

exitstatus = EXIT_FAILURE;

725

839

goto fallback;

726

840

}

727

// Starting a new process to be watched

841

/* Starting a new process to be watched */

728

842

pid_t pid = fork();

729

843

if(pid == -1){

730

844

perror("fork");

768

882

}

769

883

/* no return */

770

884

}

771

/* parent process */

885

/* Parent process */

886

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

772

887

free(filename);

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");

888

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

889

if (new_plugin == NULL){

890

perror("getplugin");

777

891

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

778

892

if(ret < 0){

779

perror("sigprocmask");

893

perror("sigprocmask");

780

894

}

781

895

exitstatus = EXIT_FAILURE;

782

896

goto fallback;

783

897

}

784

898

785

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

786

.fd = pipefd[0],

787

.next = process_list };

788

// List handling

789

process_list = new_process;

899

new_plugin->pid = pid;

900

new_plugin->fd = pipefd[0];

901

790

902

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

791

903

has already completed */

792

904

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

796

908

goto fallback;

797

909

}

798

910

799

FD_SET(new_process->fd, &rfds_all);

911

FD_SET(new_plugin->fd, &rfds_all);

800

912

801

if (maxfd < new_process->fd){

802

maxfd = new_process->fd;

913

if (maxfd < new_plugin->fd){

914

maxfd = new_plugin->fd;

803

915

}

804

916

805

917

}

806

918

807

free_plugin_list(plugin_list);

808

plugin_list = NULL;

809

810

919

closedir(dir);

811

920

dir = NULL;

812

813

if (process_list == NULL){

814

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

815

" directory?\n");

816

process_list = 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

}

817

931

}

818

while(process_list){

932

933

/* Main loop while running plugins exist */

934

while(plugin_list){

819

935

fd_set rfds = rfds_all;

820

936

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

821

937

if (select_ret == -1){

825

941

}

826

942

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

827

943

from one of them */

828

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

944

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

829

945

/* Is this process completely done? */

830

946

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

831

947

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

832

948

if(not WIFEXITED(proc->status)

833

949

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

834

950

/* Bad exit by plugin */

951

835

952

if(debug){

836

953

if(WIFEXITED(proc->status)){

837

954

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

846

963

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

847

964

}

848

965

}

966

849

967

/* Remove the plugin */

850

968

FD_CLR(proc->fd, &rfds_all);

969

851

970

/* Block signal while modifying process_list */

852

971

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

853

972

if(ret < 0){

855

974

exitstatus = EXIT_FAILURE;

856

975

goto fallback;

857

976

}

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

}

977

free_plugin(proc);

871

978

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

872

979

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

873

980

NULL);

874

981

if(ret < 0){

875

982

perror("sigprocmask");

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;

983

exitstatus = EXIT_FAILURE;

984

goto fallback;

985

}

986

987

if(plugin_list == NULL){

988

break;

989

}

990

continue;

883

991

}

992

884

993

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

885

994

886

995

bool bret = print_out_password(proc->buffer,

891

1000

}

892

1001

goto fallback;

893

1002

}

1003

894

1004

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

895

1005

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

896

1006

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

926

1036

927

1037

fallback:

928

1038

929

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

1039

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

930

1040

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

931

1041

occured */

932

1042

bool bret;

933

1043

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

934

1044

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

935

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

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);

936

1052

if(not bret){

937

1053

perror("print_out_password");

938

1054

exitstatus = EXIT_FAILURE;

947

1063

}

948

1064

949

1065

if(custom_argv != NULL){

950

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

1066

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

951

1067

free(*arg);

952

1068

}

953

1069

free(custom_argv);

954

1070

}

955

free_plugin_list(plugin_list);

956

1071

957

1072

if(dir != NULL){

958

1073

closedir(dir);

959

1074

}

960

1075

961

1076

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

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");

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

}

969

1085

}

970

free(process_list->buffer);

971

free(process_list);

972

1086

}

973

1087

974

1088

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

978

1092

if(errno != ECHILD){

979

1093

perror("wait");

980

1094

}

1095

1096

free_plugin_list();

1097

1098

free(plugindir);

1099

free(argfile);

981

1100

982

1101

return exitstatus;

983

1102

}