/mandos/release : revision 162

56

#include <argp.h> /* struct argp_option, struct

57

argp_state, struct argp,

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argp_parse(), ARGP_ERR_UNKNOWN,

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ARGP_KEY_END, ARGP_KEY_ARG, error_t */

59

ARGP_KEY_END, ARGP_KEY_ARG,

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error_t */

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61

#include <signal.h> /* struct sigaction, sigemptyset(),

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sigaddset(), sigaction(),

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sigprocmask(), SIG_BLOCK, SIGCHLD,

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65

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

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#define BUFFER_SIZE 256

67

#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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74

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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size_t buffer_size;

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size_t buffer_length;

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bool eof;

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bool completed;

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int status;

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struct process *next;

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} 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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81

char **environ;

91

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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;

88

char *buffer;

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size_t buffer_size;

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size_t buffer_length;

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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 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){

97

static plugin *plugin_list = NULL;

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/* Gets a 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 */

103

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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106

return p;

112

118

return NULL;

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}

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}

115

121

116

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

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123

.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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128

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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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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141

return NULL;

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142

}

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new_plugin->environ[0] = NULL;

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139

145

/* 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

173

179

}

174

180

175

181

/* Add to a plugin's environment */

176

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;

179

185

}

186

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

187

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));

194

if(new == NULL){

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return false;

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}

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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}

182

205

183

184

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/*

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207

* 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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}

199

221

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process *process_list = NULL;

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222

202

/* Mark processes as completed when it exits, and save its exit

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

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status. */

204

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

205

process *proc = process_list;

206

226

while(true){

227

plugin *proc = plugin_list;

207

228

int status;

208

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

209

230

if(pid == 0){

231

/* Only still running child processes */

210

232

break;

211

233

}

212

234

if(pid == -1){

213

235

if (errno != ECHILD){

214

236

perror("waitpid");

215

237

}

216

return;

238

/* No child processes */

239

break;

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240

}

218

241

242

/* A child exited, find it in process_list */

219

243

while(proc != NULL and proc->pid != pid){

220

244

proc = proc->next;

221

245

}

228

252

}

229

253

}

230

254

255

/* Prints out a password to stdout */

231

256

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

232

257

ssize_t ret;

233

258

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

243

268

return true;

244

269

}

245

270

246

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

247

if (argv == NULL){

248

*argc = 1;

249

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

250

if(argv == NULL){

251

return NULL;

271

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

272

static void free_plugin(plugin *plugin_node){

273

274

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

275

free(*arg);

276

}

277

free(plugin_node->argv);

278

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

279

free(*env);

280

}

281

free(plugin_node->environ);

282

free(plugin_node->buffer);

283

284

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

285

if(plugin_node == plugin_list){

286

/* First one - simple */

287

plugin_list = plugin_list->next;

288

} else {

289

/* Second one or later */

290

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

291

if(p->next == plugin_node){

292

p->next = plugin_node->next;

293

break;

294

}

252

295

}

253

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

254

argv[1] = NULL;

255

}

256

*argc += 1;

257

argv = realloc(argv, sizeof(char *)

258

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

259

if(argv == NULL){

260

return NULL;

261

}

262

argv[*argc-1] = arg;

263

argv[*argc] = NULL;

264

return argv;

296

}

297

298

free(plugin_node);

265

299

}

266

300

267

static void free_plugin_list(plugin *plugin_list){

268

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

269

next = plugin_list->next;

270

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

271

free(*arg);

272

}

273

free(plugin_list->argv);

274

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

275

free(*env);

276

}

277

free(plugin_list->environ);

278

free(plugin_list);

301

static void free_plugin_list(void){

302

while(plugin_list != NULL){

303

free_plugin(plugin_list);

279

304

}

280

305

}

281

306

282

307

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

283

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

284

const char *argfile = ARGFILE;

308

char *plugindir = NULL;

309

char *argfile = NULL;

285

310

FILE *conffp;

286

311

size_t d_name_len;

287

312

DIR *dir = NULL;

319

344

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

320

345

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

321

346

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

322

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

347

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

323

348

.arg = "VAR=value",

324

349

.doc = "Environment variable passed to all plugins" },

325

350

{ .name = "options-for", .key = 'o',

326

351

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

327

352

.doc = "Options passed only to specified plugin" },

328

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

353

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

329

354

.arg = "PLUGIN:ENV=value",

330

355

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

331

356

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

332

357

.arg = "PLUGIN",

333

358

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

359

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

360

.arg = "PLUGIN",

361

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

334

362

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

335

363

.arg = "DIRECTORY",

336

364

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

337

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

338

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

339

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

340

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

341

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

342

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

343

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

344

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

365

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

366

.arg = "FILE",

367

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

368

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

369

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

370

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

371

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

372

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

373

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

374

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

375

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

345

376

{ .name = NULL }

346

377

};

347

378

348

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

349

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

350

pointer to our plugin list pointer. */

351

plugin **plugins = state->input;

379

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

380

struct argp_state *state) {

352

381

switch (key) {

353

case 'g':

382

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

354

383

if (arg != NULL){

355

384

char *p;

356

385

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

357

386

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

358

387

continue;

359

388

}

360

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

389

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

361

390

perror("add_argument");

362

391

return ARGP_ERR_UNKNOWN;

363

392

}

364

393

}

365

394

}

366

395

break;

367

case 'e':

396

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

368

397

if(arg == NULL){

369

398

break;

370

399

}

373

402

if(envdef == NULL){

374

403

break;

375

404

}

376

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

405

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

377

406

perror("add_environment");

378

407

}

379

408

}

380

409

break;

381

case 'o':

410

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

382

411

if (arg != NULL){

383

412

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

384

413

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

394

423

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

395

424

continue;

396

425

}

397

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

426

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

398

427

perror("add_argument");

399

428

return ARGP_ERR_UNKNOWN;

400

429

}

402

431

}

403

432

}

404

433

break;

405

case 'f':

434

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

406

435

if(arg == NULL){

407

436

break;

408

437

}

416

445

break;

417

446

}

418

447

envdef++;

419

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

448

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

420

449

perror("add_environment");

421

450

}

422

451

}

423

452

break;

424

case 'd':

453

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

425

454

if (arg != NULL){

426

plugin *p = getplugin(arg, plugins);

455

plugin *p = getplugin(arg);

427

456

if(p == NULL){

428

457

return ARGP_ERR_UNKNOWN;

429

458

}

430

459

p->disabled = true;

431

460

}

432

461

break;

433

case 128:

434

plugindir = arg;

435

break;

436

case 129:

462

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

463

if (arg != NULL){

464

plugin *p = getplugin(arg);

465

if(p == NULL){

466

return ARGP_ERR_UNKNOWN;

467

}

468

p->disabled = false;

469

}

470

break;

471

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

472

plugindir = strdup(arg);

473

if(plugindir == NULL){

474

perror("strdup");

475

}

476

break;

477

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

478

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

479

break;

480

case 130: /* --userid */

437

481

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

438

482

break;

439

case 130:

483

case 131: /* --groupid */

440

484

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

441

485

break;

442

case 131:

486

case 132: /* --debug */

443

487

debug = true;

444

488

break;

445

489

case ARGP_KEY_ARG:

453

497

return 0;

454

498

}

455

499

456

plugin *plugin_list = NULL;

500

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

501

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

502

error_t parse_opt_config_file (int key, char *arg,

503

__attribute__((unused))

504

struct argp_state *state) {

505

switch (key) {

506

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

507

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

508

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

509

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

510

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

511

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

512

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

513

break;

514

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

515

argfile = strdup(arg);

516

if(argfile == NULL){

517

perror("strdup");

518

}

519

break;

520

case 130: /* --userid */

521

case 131: /* --groupid */

522

case 132: /* --debug */

523

case ARGP_KEY_ARG:

524

case ARGP_KEY_END:

525

break;

526

default:

527

return ARGP_ERR_UNKNOWN;

528

}

529

return 0;

530

}

457

531

458

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

459

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

532

struct argp argp = { .options = options,

533

.parser = parse_opt_config_file,

534

.args_doc = "",

460

535

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

461

536

462

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

537

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

538

config file location, if any. */

539

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

463

540

if (ret == ARGP_ERR_UNKNOWN){

464

541

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

465

542

exitstatus = EXIT_FAILURE;

466

543

goto fallback;

467

544

}

468

469

conffp = fopen(argfile, "r");

545

546

/* Reset to the normal argument parser */

547

argp.parser = parse_opt;

548

549

/* Open the configfile if available */

550

if (argfile == NULL){

551

conffp = fopen(AFILE, "r");

552

} else {

553

conffp = fopen(argfile, "r");

554

}

470

555

if(conffp != NULL){

471

556

char *org_line = NULL;

472

557

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

475

560

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

476

561

const char comment_delim[] = "#";

477

562

563

custom_argc = 1;

564

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

565

if(custom_argv == NULL){

566

perror("malloc");

567

exitstatus = EXIT_FAILURE;

568

goto fallback;

569

}

570

custom_argv[0] = argv[0];

571

custom_argv[1] = NULL;

572

573

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

574

commented text */

478

575

while(true){

479

576

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

480

577

if(sret == -1){

488

585

continue;

489

586

}

490

587

new_arg = strdup(p);

491

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

492

if (custom_argv == NULL){

493

perror("add_to_argv");

494

exitstatus = EXIT_FAILURE;

495

goto fallback;

496

}

588

if(new_arg == NULL){

589

perror("strdup");

590

exitstatus = EXIT_FAILURE;

591

free(org_line);

592

goto fallback;

593

}

594

595

custom_argc += 1;

596

custom_argv = realloc(custom_argv, sizeof(char *)

597

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

598

if(custom_argv == NULL){

599

perror("realloc");

600

exitstatus = EXIT_FAILURE;

601

free(org_line);

602

goto fallback;

603

}

604

custom_argv[custom_argc-1] = new_arg;

605

custom_argv[custom_argc] = NULL;

497

606

}

498

607

}

499

608

free(org_line);

500

} else{

609

} else {

501

610

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

502

611

not affect opening plugins */

503

612

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

506

615

goto fallback;

507

616

}

508

617

}

509

618

/* If there was any arguments from configuration file,

619

pass them to parser as command arguments */

510

620

if(custom_argv != NULL){

511

custom_argv[0] = argv[0];

512

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

621

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

622

0, NULL);

513

623

if (ret == ARGP_ERR_UNKNOWN){

514

624

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

515

625

exitstatus = EXIT_FAILURE;

517

627

}

518

628

}

519

629

630

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

631

config file */

632

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

633

if (ret == ARGP_ERR_UNKNOWN){

634

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

635

exitstatus = EXIT_FAILURE;

636

goto fallback;

637

}

638

520

639

if(debug){

521

640

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

522

641

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

531

650

}

532

651

}

533

652

653

/* Strip permissions down to nobody */

534

654

ret = setuid(uid);

535

655

if (ret == -1){

536

656

perror("setuid");

537

}

538

657

}

539

658

setgid(gid);

540

659

if (ret == -1){

541

660

perror("setgid");

542

661

}

543

662

544

dir = opendir(plugindir);

663

if (plugindir == NULL){

664

dir = opendir(PDIR);

665

} else {

666

dir = opendir(plugindir);

667

}

668

545

669

if(dir == NULL){

546

670

perror("Could not open plugin dir");

547

671

exitstatus = EXIT_FAILURE;

563

687

564

688

FD_ZERO(&rfds_all);

565

689

690

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

566

691

while(true){

567

692

dirst = readdir(dir);

568

693

569

// All directory entries have been processed

694

/* All directory entries have been processed */

570

695

if(dirst == NULL){

571

696

if (errno == EBADF){

572

697

perror("readdir");

578

703

579

704

d_name_len = strlen(dirst->d_name);

580

705

581

// Ignore dotfiles, backup files and other junk

706

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

582

707

{

583

708

bool bad_name = false;

584

709

599

724

break;

600

725

}

601

726

}

602

603

727

if(bad_name){

604

728

continue;

605

729

}

606

607

730

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

608

731

size_t suf_len = strlen(*suf);

609

732

if((d_name_len >= suf_len)

636

759

free(filename);

637

760

continue;

638

761

}

639

762

763

/* Ignore non-executable files */

640

764

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

641

765

if(debug){

642

766

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

645

769

free(filename);

646

770

continue;

647

771

}

648

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

772

773

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

649

774

if(p == NULL){

650

775

perror("getplugin");

651

776

free(filename);

661

786

}

662

787

{

663

788

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

664

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

789

plugin *g = getplugin(NULL);

665

790

if(g != NULL){

666

791

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

667

792

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

670

795

}

671

796

/* Add global environment variables */

672

797

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

673

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

798

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

674

799

perror("add_environment");

675

800

}

676

801

}

681

806

process, too. */

682

807

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

683

808

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

684

char *copy = strdup(*e);

685

if(copy == NULL){

686

perror("strdup");

687

continue;

688

}

689

if(not add_environment(p, copy)){

809

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

690

810

perror("add_environment");

691

811

}

692

812

}

699

819

exitstatus = EXIT_FAILURE;

700

820

goto fallback;

701

821

}

822

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

702

823

ret = set_cloexec_flag(pipefd[0]);

703

824

if(ret < 0){

704

825

perror("set_cloexec_flag");

718

839

exitstatus = EXIT_FAILURE;

719

840

goto fallback;

720

841

}

721

// Starting a new process to be watched

842

/* Starting a new process to be watched */

722

843

pid_t pid = fork();

723

844

if(pid == -1){

724

845

perror("fork");

762

883

}

763

884

/* no return */

764

885

}

765

/* parent process */

886

/* Parent process */

887

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

766

888

free(filename);

767

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

768

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

769

if (new_process == NULL){

770

perror("malloc");

889

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

890

if (new_plugin == NULL){

891

perror("getplugin");

771

892

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

772

893

if(ret < 0){

773

perror("sigprocmask");

894

perror("sigprocmask");

774

895

}

775

896

exitstatus = EXIT_FAILURE;

776

897

goto fallback;

777

898

}

778

899

779

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

780

.fd = pipefd[0],

781

.next = process_list };

782

// List handling

783

process_list = new_process;

900

new_plugin->pid = pid;

901

new_plugin->fd = pipefd[0];

902

784

903

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

785

904

has already completed */

786

905

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

790

909

goto fallback;

791

910

}

792

911

793

FD_SET(new_process->fd, &rfds_all);

912

FD_SET(new_plugin->fd, &rfds_all);

794

913

795

if (maxfd < new_process->fd){

796

maxfd = new_process->fd;

914

if (maxfd < new_plugin->fd){

915

maxfd = new_plugin->fd;

797

916

}

798

917

799

918

}

800

919

801

free_plugin_list(plugin_list);

802

plugin_list = NULL;

803

804

920

closedir(dir);

805

921

dir = NULL;

806

807

if (process_list == NULL){

808

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

809

" directory?\n");

810

process_list = NULL;

922

923

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

924

if(p->pid != 0){

925

break;

926

}

927

if(p->next == NULL){

928

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

929

" directory?\n");

930

free_plugin_list();

931

}

811

932

}

812

while(process_list){

933

934

/* Main loop while running plugins exist */

935

while(plugin_list){

813

936

fd_set rfds = rfds_all;

814

937

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

815

938

if (select_ret == -1){

819

942

}

820

943

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

821

944

from one of them */

822

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

945

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

823

946

/* Is this process completely done? */

824

947

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

825

948

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

826

949

if(not WIFEXITED(proc->status)

827

950

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

828

951

/* Bad exit by plugin */

952

829

953

if(debug){

830

954

if(WIFEXITED(proc->status)){

831

955

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

840

964

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

841

965

}

842

966

}

967

843

968

/* Remove the plugin */

844

969

FD_CLR(proc->fd, &rfds_all);

970

845

971

/* Block signal while modifying process_list */

846

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

972

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

847

973

if(ret < 0){

848

974

perror("sigprocmask");

849

975

exitstatus = EXIT_FAILURE;

850

976

goto fallback;

851

977

}

852

/* Delete this process entry from the list */

853

if(process_list == proc){

854

/* First one - simple */

855

process_list = proc->next;

856

} else {

857

/* Second one or later */

858

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

859

if(p->next == proc){

860

p->next = proc->next;

861

break;

862

}

863

}

864

}

978

free_plugin(proc);

865

979

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

866

980

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

867

981

NULL);

868

982

if(ret < 0){

869

983

perror("sigprocmask");

870

}

871

free(proc->buffer);

872

free(proc);

873

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

874

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

875

the process list */

876

break;

984

exitstatus = EXIT_FAILURE;

985

goto fallback;

986

}

987

988

if(plugin_list == NULL){

989

break;

990

}

991

continue;

877

992

}

993

878

994

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

879

995

880

bool bret = print_out_password(proc->buffer, proc->buffer_length);

996

bool bret = print_out_password(proc->buffer,

997

proc->buffer_length);

881

998

if(not bret){

882

999

perror("print_out_password");

883

1000

exitstatus = EXIT_FAILURE;

884

1001

}

885

1002

goto fallback;

886

1003

}

1004

887

1005

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

888

1006

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

889

1007

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

919

1037

920

1038

fallback:

921

1039

922

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

923

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

1040

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

1041

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

1042

occured */

924

1043

bool bret;

925

1044

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

926

1045

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

939

1058

}

940

1059

941

1060

if(custom_argv != NULL){

942

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

1061

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

943

1062

free(*arg);

944

1063

}

945

1064

free(custom_argv);

946

1065

}

947

free_plugin_list(plugin_list);

948

1066

949

1067

if(dir != NULL){

950

1068

closedir(dir);

951

1069

}

952

1070

953

1071

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

954

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

955

next = process_list->next;

956

close(process_list->fd);

957

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

958

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

959

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

960

perror("kill");

1072

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

1073

if(p->pid != 0){

1074

close(p->fd);

1075

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

1076

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

1077

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

1078

perror("kill");

1079

}

961

1080

}

962

free(process_list->buffer);

963

free(process_list);

964

1081

}

965

1082

966

1083

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

970

1087

if(errno != ECHILD){

971

1088

perror("wait");

972

1089

}

1090

1091

free_plugin_list();

1092

1093

free(plugindir);

1094

free(argfile);

973

1095

974

1096

return exitstatus;

975

1097

}