/mandos/trunk : revision 155

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(),

61

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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

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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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73

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

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72

struct process;

73

74

typedef struct process{

75

pid_t pid;

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int fd;

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char *buffer;

78

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

82

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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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){

97

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 */

101

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))){

100

106

return p;

112

118

return NULL;

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119

}

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}

115

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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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126

122

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

123

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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135

131

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

132

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if(new_plugin->environ == NULL){

133

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free(copy_name);

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141

return NULL;

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142

}

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143

new_plugin->environ[0] = NULL;

144

139

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/* Append the new plugin to the list */

140

*plugin_list = new_plugin;

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plugin_list = new_plugin;

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return new_plugin;

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148

}

143

149

173

179

}

174

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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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return false;

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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 */

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if(replace){

193

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

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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));

181

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}

182

205

183

184

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/*

185

207

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

186

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* Descriptor Flags".

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

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220

}

199

221

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process *process_list = NULL;

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222

202

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

223

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

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status. */

204

225

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

205

process *proc = process_list;

206

int status;

207

pid_t pid = wait(&status);

208

if(pid == -1){

209

perror("wait");

210

return;

211

}

212

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

213

proc = proc->next;

214

}

215

if(proc == NULL){

216

/* Process not found in process list */

217

return;

218

}

219

proc->status = status;

220

proc->completed = true;

226

while(true){

227

plugin *proc = plugin_list;

228

int status;

229

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

230

if(pid == 0){

231

/* Only still running child processes */

232

break;

233

}

234

if(pid == -1){

235

if (errno != ECHILD){

236

perror("waitpid");

237

}

238

/* No child processes */

239

break;

240

}

241

242

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

243

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

244

proc = proc->next;

245

}

246

if(proc == NULL){

247

/* Process not found in process list */

248

continue;

249

}

250

proc->status = status;

251

proc->completed = true;

252

}

221

253

}

222

254

255

/* Prints out a password to stdout */

223

256

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

224

257

ssize_t ret;

225

258

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

235

268

return true;

236

269

}

237

270

238

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

239

if (argv == NULL){

240

*argc = 1;

241

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

242

if(argv == NULL){

243

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

}

244

295

}

245

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

246

argv[1] = NULL;

247

}

248

*argc += 1;

249

argv = realloc(argv, sizeof(char *)

250

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

251

if(argv == NULL){

252

return NULL;

253

}

254

argv[*argc-1] = arg;

255

argv[*argc] = NULL;

256

return argv;

296

}

297

298

free(plugin_node);

257

299

}

258

300

259

static void free_plugin_list(plugin *plugin_list){

260

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

261

next = plugin_list->next;

262

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

263

free(*arg);

264

}

265

free(plugin_list->argv);

266

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

267

free(*env);

268

}

269

free(plugin_list->environ);

270

free(plugin_list);

301

static void free_plugin_list(void){

302

while(plugin_list != NULL){

303

free_plugin(plugin_list);

271

304

}

272

305

}

273

306

274

307

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

275

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

276

const char *argfile = ARGFILE;

308

char *plugindir = NULL;

309

char *argfile = NULL;

277

310

FILE *conffp;

278

311

size_t d_name_len;

279

312

DIR *dir = NULL;

311

344

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

312

345

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

313

346

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

314

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

347

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

315

348

.arg = "VAR=value",

316

349

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

317

350

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

318

351

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

319

352

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

320

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

353

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

321

354

.arg = "PLUGIN:ENV=value",

322

355

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

323

356

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

324

357

.arg = "PLUGIN",

325

358

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

359

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

360

.arg = "PLUGIN",

361

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

326

362

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

327

363

.arg = "DIRECTORY",

328

364

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

329

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

330

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

331

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

332

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

333

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

334

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

335

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

336

.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 },

337

376

{ .name = NULL }

338

377

};

339

378

340

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

341

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

342

pointer to our plugin list pointer. */

343

plugin **plugins = state->input;

379

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

380

struct argp_state *state) {

344

381

switch (key) {

345

case 'g':

382

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

346

383

if (arg != NULL){

347

384

char *p;

348

385

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

349

386

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

350

387

continue;

351

388

}

352

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

389

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

353

390

perror("add_argument");

354

391

return ARGP_ERR_UNKNOWN;

355

392

}

356

393

}

357

394

}

358

395

break;

359

case 'e':

396

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

360

397

if(arg == NULL){

361

398

break;

362

399

}

365

402

if(envdef == NULL){

366

403

break;

367

404

}

368

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

405

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

369

406

perror("add_environment");

370

407

}

371

408

}

372

409

break;

373

case 'o':

410

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

374

411

if (arg != NULL){

375

412

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

376

413

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

386

423

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

387

424

continue;

388

425

}

389

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

426

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

390

427

perror("add_argument");

391

428

return ARGP_ERR_UNKNOWN;

392

429

}

394

431

}

395

432

}

396

433

break;

397

case 'f':

434

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

398

435

if(arg == NULL){

399

436

break;

400

437

}

408

445

break;

409

446

}

410

447

envdef++;

411

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

448

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

412

449

perror("add_environment");

413

450

}

414

451

}

415

452

break;

416

case 'd':

453

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

417

454

if (arg != NULL){

418

plugin *p = getplugin(arg, plugins);

455

plugin *p = getplugin(arg);

419

456

if(p == NULL){

420

457

return ARGP_ERR_UNKNOWN;

421

458

}

422

459

p->disabled = true;

423

460

}

424

461

break;

425

case 128:

426

plugindir = arg;

427

break;

428

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 */

429

481

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

430

482

break;

431

case 130:

483

case 131: /* --groupid */

432

484

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

433

485

break;

434

case 131:

486

case 132: /* --debug */

435

487

debug = true;

436

488

break;

437

489

case ARGP_KEY_ARG:

445

497

return 0;

446

498

}

447

499

448

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

}

449

531

450

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

451

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

532

struct argp argp = { .options = options,

533

.parser = parse_opt_config_file,

534

.args_doc = "",

452

535

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

453

536

454

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);

455

540

if (ret == ARGP_ERR_UNKNOWN){

456

541

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

457

542

exitstatus = EXIT_FAILURE;

458

543

goto fallback;

459

544

}

460

461

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

}

462

555

if(conffp != NULL){

463

556

char *org_line = NULL;

464

557

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

467

560

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

468

561

const char comment_delim[] = "#";

469

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 */

470

575

while(true){

471

576

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

472

577

if(sret == -1){

480

585

continue;

481

586

}

482

587

new_arg = strdup(p);

483

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

484

if (custom_argv == NULL){

485

perror("add_to_argv");

486

exitstatus = EXIT_FAILURE;

487

goto fallback;

488

}

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;

489

606

}

490

607

}

491

608

free(org_line);

492

} else{

609

} else {

493

610

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

494

611

not affect opening plugins */

495

612

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

498

615

goto fallback;

499

616

}

500

617

}

501

618

/* If there was any arguments from configuration file,

619

pass them to parser as command arguments */

502

620

if(custom_argv != NULL){

503

custom_argv[0] = argv[0];

504

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);

505

623

if (ret == ARGP_ERR_UNKNOWN){

506

624

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

507

625

exitstatus = EXIT_FAILURE;

509

627

}

510

628

}

511

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

512

639

if(debug){

513

640

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

514

641

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

523

650

}

524

651

}

525

652

653

/* Strip permissions down to nobody */

526

654

ret = setuid(uid);

527

655

if (ret == -1){

528

656

perror("setuid");

529

}

530

657

}

531

658

setgid(gid);

532

659

if (ret == -1){

533

660

perror("setgid");

534

661

}

535

662

536

dir = opendir(plugindir);

663

if (plugindir == NULL){

664

dir = opendir(PDIR);

665

} else {

666

dir = opendir(plugindir);

667

}

668

537

669

if(dir == NULL){

538

670

perror("Could not open plugin dir");

539

671

exitstatus = EXIT_FAILURE;

555

687

556

688

FD_ZERO(&rfds_all);

557

689

690

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

558

691

while(true){

559

692

dirst = readdir(dir);

560

693

561

// All directory entries have been processed

694

/* All directory entries have been processed */

562

695

if(dirst == NULL){

563

696

if (errno == EBADF){

564

697

perror("readdir");

570

703

571

704

d_name_len = strlen(dirst->d_name);

572

705

573

// Ignore dotfiles, backup files and other junk

706

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

574

707

{

575

708

bool bad_name = false;

576

709

591

724

break;

592

725

}

593

726

}

594

595

727

if(bad_name){

596

728

continue;

597

729

}

598

599

730

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

600

731

size_t suf_len = strlen(*suf);

601

732

if((d_name_len >= suf_len)

628

759

free(filename);

629

760

continue;

630

761

}

631

762

763

/* Ignore non-executable files */

632

764

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

633

765

if(debug){

634

766

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

637

769

free(filename);

638

770

continue;

639

771

}

640

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

772

773

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

641

774

if(p == NULL){

642

775

perror("getplugin");

643

776

free(filename);

653

786

}

654

787

{

655

788

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

656

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

789

plugin *g = getplugin(NULL);

657

790

if(g != NULL){

658

791

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

659

792

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

662

795

}

663

796

/* Add global environment variables */

664

797

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

665

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

798

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

666

799

perror("add_environment");

667

800

}

668

801

}

673

806

process, too. */

674

807

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

675

808

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

676

char *copy = strdup(*e);

677

if(copy == NULL){

678

perror("strdup");

679

continue;

680

}

681

if(not add_environment(p, copy)){

809

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

682

810

perror("add_environment");

683

811

}

684

812

}

691

819

exitstatus = EXIT_FAILURE;

692

820

goto fallback;

693

821

}

822

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

694

823

ret = set_cloexec_flag(pipefd[0]);

695

824

if(ret < 0){

696

825

perror("set_cloexec_flag");

710

839

exitstatus = EXIT_FAILURE;

711

840

goto fallback;

712

841

}

713

// Starting a new process to be watched

842

/* Starting a new process to be watched */

714

843

pid_t pid = fork();

715

844

if(pid == -1){

716

845

perror("fork");

754

883

}

755

884

/* no return */

756

885

}

757

/* parent process */

886

/* Parent process */

887

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

758

888

free(filename);

759

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

760

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

761

if (new_process == NULL){

762

perror("malloc");

889

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

890

if (new_plugin == NULL){

891

perror("getplugin");

763

892

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

764

893

if(ret < 0){

765

perror("sigprocmask");

894

perror("sigprocmask");

766

895

}

767

896

exitstatus = EXIT_FAILURE;

768

897

goto fallback;

769

898

}

770

899

771

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

772

.fd = pipefd[0],

773

.next = process_list };

774

// List handling

775

process_list = new_process;

900

new_plugin->pid = pid;

901

new_plugin->fd = pipefd[0];

902

776

903

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

777

904

has already completed */

778

905

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

782

909

goto fallback;

783

910

}

784

911

785

FD_SET(new_process->fd, &rfds_all);

912

FD_SET(new_plugin->fd, &rfds_all);

786

913

787

if (maxfd < new_process->fd){

788

maxfd = new_process->fd;

914

if (maxfd < new_plugin->fd){

915

maxfd = new_plugin->fd;

789

916

}

790

917

791

918

}

792

919

793

free_plugin_list(plugin_list);

794

plugin_list = NULL;

795

796

920

closedir(dir);

797

921

dir = NULL;

798

799

if (process_list == NULL){

800

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

801

" directory?\n");

802

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

}

803

932

}

804

while(process_list){

933

934

/* Main loop while running plugins exist */

935

while(plugin_list){

805

936

fd_set rfds = rfds_all;

806

937

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

807

938

if (select_ret == -1){

811

942

}

812

943

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

813

944

from one of them */

814

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

945

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

815

946

/* Is this process completely done? */

816

947

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

817

948

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

818

949

if(not WIFEXITED(proc->status)

819

950

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

820

951

/* Bad exit by plugin */

952

821

953

if(debug){

822

954

if(WIFEXITED(proc->status)){

823

955

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

832

964

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

833

965

}

834

966

}

967

835

968

/* Remove the plugin */

836

969

FD_CLR(proc->fd, &rfds_all);

970

837

971

/* Block signal while modifying process_list */

838

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

972

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

839

973

if(ret < 0){

840

974

perror("sigprocmask");

841

975

exitstatus = EXIT_FAILURE;

842

976

goto fallback;

843

977

}

844

/* Delete this process entry from the list */

845

if(process_list == proc){

846

/* First one - simple */

847

process_list = proc->next;

848

} else {

849

/* Second one or later */

850

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

851

if(p->next == proc){

852

p->next = proc->next;

853

break;

854

}

855

}

856

}

978

free_plugin(proc);

857

979

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

858

980

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

859

981

NULL);

860

982

if(ret < 0){

861

983

perror("sigprocmask");

862

}

863

free(proc->buffer);

864

free(proc);

865

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

866

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

867

the process list */

868

break;

984

exitstatus = EXIT_FAILURE;

985

goto fallback;

986

}

987

988

if(plugin_list == NULL){

989

break;

990

}

991

continue;

869

992

}

993

870

994

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

871

995

872

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

996

bool bret = print_out_password(proc->buffer,

997

proc->buffer_length);

873

998

if(not bret){

874

999

perror("print_out_password");

875

1000

exitstatus = EXIT_FAILURE;

876

1001

}

877

1002

goto fallback;

878

1003

}

1004

879

1005

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

880

1006

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

881

1007

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

911

1037

912

1038

fallback:

913

1039

914

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

915

/* 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 */

916

1043

bool bret;

917

1044

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

918

1045

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

931

1058

}

932

1059

933

1060

if(custom_argv != NULL){

934

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

1061

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

935

1062

free(*arg);

936

1063

}

937

1064

free(custom_argv);

938

1065

}

939

free_plugin_list(plugin_list);

940

1066

941

1067

if(dir != NULL){

942

1068

closedir(dir);

943

1069

}

944

1070

945

1071

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

946

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

947

next = process_list->next;

948

close(process_list->fd);

949

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

950

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

951

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

952

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

}

953

1080

}

954

free(process_list->buffer);

955

free(process_list);

956

1081

}

957

1082

958

1083

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

962

1087

if(errno != ECHILD){

963

1088

perror("wait");

964

1089

}

1090

1091

free_plugin_list();

1092

1093

free(plugindir);

1094

free(argfile);

965

1095

966

1096

return exitstatus;

967

1097

}