/mandos/trunk : revision 183

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;

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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 *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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149

174

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}

175

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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){

178

183

if(p == NULL){

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184

return false;

180

185

}

186

/* namelen = length of name of environment variable */

187

size_t namelen = (size_t)(strchrnul(def, '=') - def);

188

/* Search for this environment variable */

189

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);

194

if(new == NULL){

195

return false;

196

}

197

*e = new;

198

strcpy(*e, def);

199

}

200

return true;

201

}

202

}

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

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}

183

205

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185

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/*

186

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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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203

223

/* 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){

206

226

while(true){

207

process *proc = process_list;

227

plugin *proc = plugin_list;

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int status;

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

210

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if(pid == 0){

218

238

/* No child processes */

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239

break;

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240

}

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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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253

}

234

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255

/* Prints out a password to stdout */

235

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

236

257

ssize_t ret;

237

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

238

length--;

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}

240

258

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

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259

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

242

260

length - written));

247

265

return true;

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}

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267

250

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

251

if (argv == NULL){

252

*argc = 1;

253

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++){

272

free(*arg);

273

}

274

free(plugin_node->argv);

275

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

276

free(*env);

277

}

278

free(plugin_node->environ);

279

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

}

256

292

}

257

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

258

argv[1] = NULL;

259

}

260

*argc += 1;

261

argv = realloc(argv, sizeof(char *)

262

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

263

if(argv == NULL){

264

return NULL;

265

}

266

argv[*argc-1] = arg;

267

argv[*argc] = NULL;

268

return argv;

293

}

294

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free(plugin_node);

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296

}

270

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static void free_plugin_list(plugin *plugin_list){

272

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

273

next = plugin_list->next;

274

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

275

free(*arg);

276

}

277

free(plugin_list->argv);

278

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

279

free(*env);

280

}

281

free(plugin_list->environ);

282

free(plugin_list);

298

static void free_plugin_list(void){

299

while(plugin_list != NULL){

300

free_plugin(plugin_list);

283

301

}

284

302

}

285

303

286

304

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

287

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

288

const char *argfile = ARGFILE;

305

char *plugindir = NULL;

306

char *argfile = NULL;

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307

FILE *conffp;

290

308

size_t d_name_len;

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309

DIR *dir = NULL;

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341

{ .name = "global-options", .key = 'g',

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.arg = "OPTION[,OPTION[,...]]",

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343

.doc = "Options passed to all plugins" },

326

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

344

{ .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" },

332

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

350

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

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.arg = "PLUGIN:ENV=value",

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352

.doc = "Environment variable passed to specified plugin" },

335

353

{ .name = "disable", .key = 'd',

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354

.arg = "PLUGIN",

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355

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

356

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

357

.arg = "PLUGIN",

358

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

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359

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

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360

.arg = "DIRECTORY",

340

361

.doc = "Specify a different plugin directory", .group = 2 },

341

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

342

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

343

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

344

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

345

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

346

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

347

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

348

.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,

366

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

367

.doc = "User ID the plugins will run as", .group = 3 },

368

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

369

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

370

.doc = "Group ID the plugins will run as", .group = 3 },

371

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

372

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

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373

{ .name = NULL }

350

374

};

351

375

352

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

353

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

354

pointer to our plugin list pointer. */

355

plugin **plugins = state->input;

376

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

377

struct argp_state *state) {

356

378

switch (key) {

357

case 'g':

379

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

358

380

if (arg != NULL){

359

381

char *p;

360

382

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

361

383

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

362

384

continue;

363

385

}

364

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

386

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

365

387

perror("add_argument");

366

388

return ARGP_ERR_UNKNOWN;

367

389

}

368

390

}

369

391

}

370

392

break;

371

case 'e':

393

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

372

394

if(arg == NULL){

373

395

break;

374

396

}

375

{

376

char *envdef = strdup(arg);

377

if(envdef == NULL){

378

break;

379

}

380

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

381

perror("add_environment");

382

}

397

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

398

perror("add_environment");

383

399

}

384

400

break;

385

case 'o':

401

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

386

402

if (arg != NULL){

387

403

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

388

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

404

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

389

405

break;

390

406

}

391

407

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

392

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

408

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

393

409

break;

394

410

}

395

if(opt != NULL){

396

char *p;

397

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

398

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

399

continue;

400

}

401

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

402

perror("add_argument");

403

return ARGP_ERR_UNKNOWN;

404

}

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;

405

419

}

406

420

}

407

421

}

408

422

break;

409

case 'f':

423

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

410

424

if(arg == NULL){

411

425

break;

412

426

}

415

429

if(envdef == NULL){

416

430

break;

417

431

}

418

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

419

if(p_name == NULL){

420

break;

421

}

422

envdef++;

423

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

432

*envdef = '\0';

433

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

424

434

perror("add_environment");

425

435

}

426

436

}

427

437

break;

428

case 'd':

438

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

429

439

if (arg != NULL){

430

plugin *p = getplugin(arg, plugins);

440

plugin *p = getplugin(arg);

431

441

if(p == NULL){

432

442

return ARGP_ERR_UNKNOWN;

433

443

}

434

444

p->disabled = true;

435

445

}

436

446

break;

437

case 128:

438

plugindir = arg;

439

break;

440

case 129:

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 */

441

467

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

442

468

break;

443

case 130:

469

case 131: /* --groupid */

444

470

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

445

471

break;

446

case 131:

472

case 132: /* --debug */

447

473

debug = true;

448

474

break;

449

475

case ARGP_KEY_ARG:

450

fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);

451

break;

452

case ARGP_KEY_END:

453

break;

454

default:

455

return ARGP_ERR_UNKNOWN;

456

}

457

return 0;

458

}

459

460

plugin *plugin_list = NULL;

461

462

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

463

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

476

/* Cryptsetup always passes an argument, which is an empty

477

string if "none" was specified in /etc/crypttab. So if

478

argument was empty, we ignore it silently. */

479

if(arg[0] != '\0'){

480

fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);

481

}

482

break;

483

case ARGP_KEY_END:

484

break;

485

default:

486

return ARGP_ERR_UNKNOWN;

487

}

488

return 0;

489

}

490

491

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

492

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

493

error_t parse_opt_config_file (int key, char *arg,

494

__attribute__((unused))

495

struct argp_state *state) {

496

switch (key) {

497

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

498

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

499

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

500

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

501

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

502

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

503

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

504

break;

505

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

506

free(argfile);

507

argfile = strdup(arg);

508

if(argfile == NULL){

509

perror("strdup");

510

}

511

break;

512

case 130: /* --userid */

513

case 131: /* --groupid */

514

case 132: /* --debug */

515

case ARGP_KEY_ARG:

516

case ARGP_KEY_END:

517

break;

518

default:

519

return ARGP_ERR_UNKNOWN;

520

}

521

return 0;

522

}

523

524

struct argp argp = { .options = options,

525

.parser = parse_opt_config_file,

526

.args_doc = "",

464

527

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

465

528

466

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

529

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

530

config file location, if any. */

531

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

467

532

if (ret == ARGP_ERR_UNKNOWN){

468

533

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

469

534

exitstatus = EXIT_FAILURE;

470

535

goto fallback;

471

536

}

472

473

conffp = fopen(argfile, "r");

537

538

/* Reset to the normal argument parser */

539

argp.parser = parse_opt;

540

541

/* Open the configfile if available */

542

if (argfile == NULL){

543

conffp = fopen(AFILE, "r");

544

} else {

545

conffp = fopen(argfile, "r");

546

}

474

547

if(conffp != NULL){

475

548

char *org_line = NULL;

476

549

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

479

552

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

480

553

const char comment_delim[] = "#";

481

554

555

custom_argc = 1;

556

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

557

if(custom_argv == NULL){

558

perror("malloc");

559

exitstatus = EXIT_FAILURE;

560

goto fallback;

561

}

562

custom_argv[0] = argv[0];

563

custom_argv[1] = NULL;

564

565

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

566

commented text */

482

567

while(true){

483

568

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

484

569

if(sret == -1){

492

577

continue;

493

578

}

494

579

new_arg = strdup(p);

495

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

496

if (custom_argv == NULL){

497

perror("add_to_argv");

498

exitstatus = EXIT_FAILURE;

499

goto fallback;

500

}

580

if(new_arg == NULL){

581

perror("strdup");

582

exitstatus = EXIT_FAILURE;

583

free(org_line);

584

goto fallback;

585

}

586

587

custom_argc += 1;

588

custom_argv = realloc(custom_argv, sizeof(char *)

589

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

590

if(custom_argv == NULL){

591

perror("realloc");

592

exitstatus = EXIT_FAILURE;

593

free(org_line);

594

goto fallback;

595

}

596

custom_argv[custom_argc-1] = new_arg;

597

custom_argv[custom_argc] = NULL;

501

598

}

502

599

}

503

600

free(org_line);

504

} else{

601

} else {

505

602

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

506

603

not affect opening plugins */

507

604

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

510

607

goto fallback;

511

608

}

512

609

}

513

610

/* If there was any arguments from configuration file,

611

pass them to parser as command arguments */

514

612

if(custom_argv != NULL){

515

custom_argv[0] = argv[0];

516

ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);

613

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

614

0, NULL);

517

615

if (ret == ARGP_ERR_UNKNOWN){

518

616

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

519

617

exitstatus = EXIT_FAILURE;

521

619

}

522

620

}

523

621

622

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

623

config file */

624

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

625

if (ret == ARGP_ERR_UNKNOWN){

626

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

627

exitstatus = EXIT_FAILURE;

628

goto fallback;

629

}

630

524

631

if(debug){

525

632

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

526

633

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

535

642

}

536

643

}

537

644

645

/* Strip permissions down to nobody */

538

646

ret = setuid(uid);

539

647

if (ret == -1){

540

648

perror("setuid");

541

}

542

649

}

543

650

setgid(gid);

544

651

if (ret == -1){

545

652

perror("setgid");

546

653

}

547

654

548

dir = opendir(plugindir);

655

if (plugindir == NULL){

656

dir = opendir(PDIR);

657

} else {

658

dir = opendir(plugindir);

659

}

660

549

661

if(dir == NULL){

550

662

perror("Could not open plugin dir");

551

663

exitstatus = EXIT_FAILURE;

567

679

568

680

FD_ZERO(&rfds_all);

569

681

682

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

570

683

while(true){

571

684

dirst = readdir(dir);

572

685

573

// All directory entries have been processed

686

/* All directory entries have been processed */

574

687

if(dirst == NULL){

575

688

if (errno == EBADF){

576

689

perror("readdir");

582

695

583

696

d_name_len = strlen(dirst->d_name);

584

697

585

// Ignore dotfiles, backup files and other junk

698

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

586

699

{

587

700

bool bad_name = false;

588

701

603

716

break;

604

717

}

605

718

}

606

607

719

if(bad_name){

608

720

continue;

609

721

}

610

611

722

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

612

723

size_t suf_len = strlen(*suf);

613

724

if((d_name_len >= suf_len)

628

739

}

629

740

630

741

char *filename;

631

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

742

if(plugindir == NULL){

743

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

744

} else {

745

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

746

}

632

747

if(ret < 0){

633

748

perror("asprintf");

634

749

continue;

640

755

free(filename);

641

756

continue;

642

757

}

643

758

759

/* Ignore non-executable files */

644

760

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

645

761

if(debug){

646

762

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

649

765

free(filename);

650

766

continue;

651

767

}

652

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

768

769

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

653

770

if(p == NULL){

654

771

perror("getplugin");

655

772

free(filename);

665

782

}

666

783

{

667

784

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

668

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

785

plugin *g = getplugin(NULL);

669

786

if(g != NULL){

670

787

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

671

788

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

674

791

}

675

792

/* Add global environment variables */

676

793

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

677

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

794

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

678

795

perror("add_environment");

679

796

}

680

797

}

685

802

process, too. */

686

803

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

687

804

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

688

char *copy = strdup(*e);

689

if(copy == NULL){

690

perror("strdup");

691

continue;

692

}

693

if(not add_environment(p, copy)){

805

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

694

806

perror("add_environment");

695

807

}

696

808

}

703

815

exitstatus = EXIT_FAILURE;

704

816

goto fallback;

705

817

}

818

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

706

819

ret = set_cloexec_flag(pipefd[0]);

707

820

if(ret < 0){

708

821

perror("set_cloexec_flag");

722

835

exitstatus = EXIT_FAILURE;

723

836

goto fallback;

724

837

}

725

// Starting a new process to be watched

838

/* Starting a new process to be watched */

726

839

pid_t pid = fork();

727

840

if(pid == -1){

728

841

perror("fork");

766

879

}

767

880

/* no return */

768

881

}

769

/* parent process */

882

/* Parent process */

883

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

770

884

free(filename);

771

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

772

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

773

if (new_process == NULL){

774

perror("malloc");

885

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

886

if (new_plugin == NULL){

887

perror("getplugin");

775

888

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

776

889

if(ret < 0){

777

perror("sigprocmask");

890

perror("sigprocmask");

778

891

}

779

892

exitstatus = EXIT_FAILURE;

780

893

goto fallback;

781

894

}

782

895

783

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

784

.fd = pipefd[0],

785

.next = process_list };

786

// List handling

787

process_list = new_process;

896

new_plugin->pid = pid;

897

new_plugin->fd = pipefd[0];

898

788

899

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

789

900

has already completed */

790

901

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

794

905

goto fallback;

795

906

}

796

907

797

FD_SET(new_process->fd, &rfds_all);

908

FD_SET(new_plugin->fd, &rfds_all);

798

909

799

if (maxfd < new_process->fd){

800

maxfd = new_process->fd;

910

if (maxfd < new_plugin->fd){

911

maxfd = new_plugin->fd;

801

912

}

802

913

803

914

}

804

915

805

free_plugin_list(plugin_list);

806

plugin_list = NULL;

807

808

916

closedir(dir);

809

917

dir = NULL;

810

811

if (process_list == NULL){

812

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

813

" directory?\n");

814

process_list = NULL;

918

919

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

920

if(p->pid != 0){

921

break;

922

}

923

if(p->next == NULL){

924

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

925

" directory?\n");

926

free_plugin_list();

927

}

815

928

}

816

while(process_list){

929

930

/* Main loop while running plugins exist */

931

while(plugin_list){

817

932

fd_set rfds = rfds_all;

818

933

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

819

934

if (select_ret == -1){

823

938

}

824

939

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

825

940

from one of them */

826

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

941

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

827

942

/* Is this process completely done? */

828

943

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

829

944

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

830

945

if(not WIFEXITED(proc->status)

831

946

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

832

947

/* Bad exit by plugin */

948

833

949

if(debug){

834

950

if(WIFEXITED(proc->status)){

835

951

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

844

960

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

845

961

}

846

962

}

963

847

964

/* Remove the plugin */

848

965

FD_CLR(proc->fd, &rfds_all);

966

849

967

/* Block signal while modifying process_list */

850

968

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

851

969

if(ret < 0){

853

971

exitstatus = EXIT_FAILURE;

854

972

goto fallback;

855

973

}

856

/* Delete this process entry from the list */

857

if(process_list == proc){

858

/* First one - simple */

859

process_list = proc->next;

860

} else {

861

/* Second one or later */

862

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

863

if(p->next == proc){

864

p->next = proc->next;

865

break;

866

}

867

}

868

}

974

869

975

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

870

976

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

871

977

NULL);

872

978

if(ret < 0){

873

979

perror("sigprocmask");

874

}

875

free(proc->buffer);

876

free(proc);

877

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

878

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

879

the process list */

880

break;

980

exitstatus = EXIT_FAILURE;

981

goto fallback;

982

}

983

984

if(plugin_list == NULL){

985

break;

986

}

987

988

plugin *next_plugin = proc->next;

989

free_plugin(proc);

990

proc = next_plugin;

991

continue;

881

992

}

993

882

994

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

883

995

884

996

bool bret = print_out_password(proc->buffer,

889

1001

}

890

1002

goto fallback;

891

1003

}

1004

892

1005

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

893

1006

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

894

1007

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

1008

proc = proc->next;

895

1009

continue;

896

1010

}

897

1011

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

910

1024

BUFFER_SIZE);

911

1025

if(ret < 0){

912

1026

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

1027

proc = proc->next;

913

1028

continue;

914

1029

}

915

1030

if(ret == 0){

924

1039

925

1040

fallback:

926

1041

927

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

1042

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

928

1043

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

929

1044

occured */

930

1045

bool bret;

931

1046

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

932

1047

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

933

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

1048

size_t len = strlen(passwordbuffer);

1049

/* Strip trailing newline */

1050

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

1051

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

1052

len--;

1053

}

1054

bret = print_out_password(passwordbuffer, len);

934

1055

if(not bret){

935

1056

perror("print_out_password");

936

1057

exitstatus = EXIT_FAILURE;

945

1066

}

946

1067

947

1068

if(custom_argv != NULL){

948

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

1069

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

949

1070

free(*arg);

950

1071

}

951

1072

free(custom_argv);

952

1073

}

953

free_plugin_list(plugin_list);

954

1074

955

1075

if(dir != NULL){

956

1076

closedir(dir);

957

1077

}

958

1078

959

1079

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

960

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

961

next = process_list->next;

962

close(process_list->fd);

963

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

964

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

965

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

966

perror("kill");

1080

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

1081

if(p->pid != 0){

1082

close(p->fd);

1083

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

1084

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

1085

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

1086

perror("kill");

1087

}

967

1088

}

968

free(process_list->buffer);

969

free(process_list);

970

1089

}

971

1090

972

1091

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

976

1095

if(errno != ECHILD){

977

1096

perror("wait");

978

1097

}

1098

1099

free_plugin_list();

1100

1101

free(plugindir);

1102

free(argfile);

979

1103

980

1104

return exitstatus;

981

1105

}