/mandos/trunk : revision 24.1.62

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#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,

60

error_t */

59

ARGP_KEY_END, ARGP_KEY_ARG, error_t */

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

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61

sigaddset(), sigaction(),

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62

sigprocmask(), SIG_BLOCK, SIGCHLD,

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64

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

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65

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66

#define BUFFER_SIZE 256

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69

#define PDIR "/lib/mandos/plugins.d"

70

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

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

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68

72

69

const char *argp_program_version = "plugin-runner 1.0";

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70

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

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71

75

struct plugin;

72

struct process;

73

74

typedef struct process{

75

pid_t pid;

76

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;

81

bool completed;

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int status;

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struct process *next;

84

} 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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90

char **environ;

82

91

int envc;

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92

bool disabled;

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85

/* 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;

90

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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93

struct plugin *next;

95

94

} plugin;

96

95

97

static plugin *plugin_list = NULL;

98

99

/* Gets a existing plugin based on name,

100

or if none is found, creates a new one */

101

static plugin *getplugin(char *name){

102

/* Check for exiting plugin with that name */

103

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

96

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

97

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

104

98

if ((p->name == name)

105

99

or (p->name and name and (strcmp(p->name, name) == 0))){

106

100

return p;

114

108

char *copy_name = NULL;

115

109

if(name != NULL){

116

110

copy_name = strdup(name);

117

if(copy_name == NULL){

118

return NULL;

119

}

120

}

121

111

}

112

if(copy_name == NULL){

113

return NULL;

114

}

115

122

116

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

123

117

.argc = 1,

118

.envc = 0,

124

119

.disabled = false,

125

.next = plugin_list };

120

.next = *plugin_list };

126

121

127

122

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

128

123

if (new_plugin->argv == NULL){

132

127

}

133

128

new_plugin->argv[0] = copy_name;

134

129

new_plugin->argv[1] = NULL;

135

130

136

131

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

137

132

if(new_plugin->environ == NULL){

138

133

free(copy_name);

141

136

return NULL;

142

137

}

143

138

new_plugin->environ[0] = NULL;

144

145

139

/* Append the new plugin to the list */

146

plugin_list = new_plugin;

140

*plugin_list = new_plugin;

147

141

return new_plugin;

148

142

}

149

143

179

173

}

180

174

181

175

/* Add to a plugin's environment */

182

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

176

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

183

177

if(p == NULL){

184

178

return false;

185

179

}

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++){

190

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){

195

return false;

196

}

197

*e = new;

198

strcpy(*e, def);

199

}

200

return true;

201

}

202

}

203

180

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

204

181

}

205

182

183

206

184

/*

207

185

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

208

186

* Descriptor Flags".

219

197

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

220

198

}

221

199

200

process *process_list = NULL;

222

201

223

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

202

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

224

203

status. */

225

204

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

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

}

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;

253

221

}

254

222

255

/* Prints out a password to stdout */

256

223

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

257

224

ssize_t ret;

258

225

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

268

235

return true;

269

236

}

270

237

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

}

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;

295

244

}

296

}

297

298

free(plugin_node);

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;

299

257

}

300

258

301

static void free_plugin_list(void){

302

while(plugin_list != NULL){

303

free_plugin(plugin_list);

304

}

259

static void free_plugin_list(plugin *plugin_list){

260

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

261

next = plugin_list->next;

262

free(plugin_list->name);

263

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

264

free(*arg);

265

}

266

free(plugin_list->argv);

267

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

268

free(*env);

269

}

270

free(plugin_list->environ);

271

free(plugin_list);

272

}

305

273

}

306

274

307

275

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

308

char *plugindir = NULL;

309

char *argfile = NULL;

276

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

277

const char *argfile = ARGFILE;

310

278

FILE *conffp;

311

279

size_t d_name_len;

312

280

DIR *dir = NULL;

335

303

ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);

336

304

if(ret == -1){

337

305

perror("sigaction");

338

exitstatus = EXIT_FAILURE;

306

exitstatus = EXIT_FAILURE;

339

307

goto fallback;

340

308

}

341

309

344

312

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

345

313

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

346

314

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

347

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

315

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

348

316

.arg = "VAR=value",

349

317

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

350

318

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

351

319

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

352

320

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

353

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

321

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

354

322

.arg = "PLUGIN:ENV=value",

355

323

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

356

324

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

359

327

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

360

328

.arg = "DIRECTORY",

361

329

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

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 },

330

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

331

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

332

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

333

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

334

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

335

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

336

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

337

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

373

338

{ .name = NULL }

374

339

};

375

340

376

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

377

struct argp_state *state) {

341

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

378

342

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

379

343

pointer to our plugin list pointer. */

344

plugin **plugins = state->input;

380

345

switch (key) {

381

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

346

case 'g':

382

347

if (arg != NULL){

383

348

char *p;

384

349

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

385

350

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

386

351

continue;

387

352

}

388

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

353

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

389

354

perror("add_argument");

390

355

return ARGP_ERR_UNKNOWN;

391

356

}

392

357

}

393

358

}

394

359

break;

395

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

360

case 'e':

396

361

if(arg == NULL){

397

362

break;

398

363

}

401

366

if(envdef == NULL){

402

367

break;

403

368

}

404

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

369

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

405

370

perror("add_environment");

406

371

}

407

372

}

408

373

break;

409

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

374

case 'o':

410

375

if (arg != NULL){

411

376

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

412

377

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

422

387

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

423

388

continue;

424

389

}

425

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

390

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

426

391

perror("add_argument");

427

392

return ARGP_ERR_UNKNOWN;

428

393

}

430

395

}

431

396

}

432

397

break;

433

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

398

case 'f':

434

399

if(arg == NULL){

435

400

break;

436

401

}

444

409

break;

445

410

}

446

411

envdef++;

447

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

412

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

448

413

perror("add_environment");

449

414

}

450

415

}

451

416

break;

452

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

417

case 'd':

453

418

if (arg != NULL){

454

plugin *p = getplugin(arg);

419

plugin *p = getplugin(arg, plugins);

455

420

if(p == NULL){

456

421

return ARGP_ERR_UNKNOWN;

457

422

}

458

423

p->disabled = true;

459

424

}

460

425

break;

461

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

462

plugindir = strdup(arg);

463

if(plugindir == NULL){

464

perror("strdup");

465

}

426

case 128:

427

plugindir = arg;

466

428

break;

467

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

468

argfile = strdup(arg);

469

if(argfile == NULL){

470

perror("strdup");

471

}

472

break;

473

case 130: /* --userid */

429

case 129:

474

430

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

475

431

break;

476

case 131: /* --groupid */

432

case 130:

477

433

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

478

434

break;

479

case 132: /* --debug */

435

case 131:

480

436

debug = true;

481

437

break;

482

438

case ARGP_KEY_ARG:

490

446

return 0;

491

447

}

492

448

449

plugin *plugin_list = NULL;

450

493

451

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

494

.args_doc = "",

452

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

495

453

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

496

454

497

/* Open the configfile if available */

498

if (argfile == NULL){

499

conffp = fopen(AFILE, "r");

500

} else {

501

conffp = fopen(argfile, "r");

502

}

455

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

456

if (ret == ARGP_ERR_UNKNOWN){

457

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

458

exitstatus = EXIT_FAILURE;

459

goto fallback;

460

}

461

462

conffp = fopen(argfile, "r");

503

463

if(conffp != NULL){

504

464

char *org_line = NULL;

505

465

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

508

468

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

509

469

const char comment_delim[] = "#";

510

470

511

custom_argc = 1;

512

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

513

if(custom_argv == NULL){

514

perror("malloc");

515

exitstatus = EXIT_FAILURE;

516

goto fallback;

517

}

518

custom_argv[0] = argv[0];

519

custom_argv[1] = NULL;

520

521

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

522

commented text */

523

471

while(true){

524

472

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

525

473

if(sret == -1){

533

481

continue;

534

482

}

535

483

new_arg = strdup(p);

536

if(new_arg == NULL){

537

perror("strdup");

538

exitstatus = EXIT_FAILURE;

539

free(org_line);

540

goto fallback;

541

}

542

543

custom_argc += 1;

544

custom_argv = realloc(custom_argv, sizeof(char *)

545

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

546

if(custom_argv == NULL){

547

perror("realloc");

548

exitstatus = EXIT_FAILURE;

549

free(org_line);

550

goto fallback;

551

}

552

custom_argv[custom_argc-1] = new_arg;

553

custom_argv[custom_argc] = NULL;

484

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

485

if (custom_argv == NULL){

486

perror("add_to_argv");

487

exitstatus = EXIT_FAILURE;

488

goto fallback;

489

}

554

490

}

555

491

}

556

492

free(org_line);

557

} else {

493

} else{

558

494

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

559

495

not affect opening plugins */

560

496

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

563

499

goto fallback;

564

500

}

565

501

}

566

/* If there was any arguments from configuration file,

567

pass them to parser as command arguments */

502

568

503

if(custom_argv != NULL){

569

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

570

0, NULL);

504

custom_argv[0] = argv[0];

505

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

571

506

if (ret == ARGP_ERR_UNKNOWN){

572

507

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

573

508

exitstatus = EXIT_FAILURE;

575

510

}

576

511

}

577

512

578

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

579

config file */

580

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

581

if (ret == ARGP_ERR_UNKNOWN){

582

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

583

exitstatus = EXIT_FAILURE;

584

goto fallback;

585

}

586

587

513

if(debug){

588

514

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

589

515

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

598

524

}

599

525

}

600

526

601

/* Strip permissions down to nobody */

602

527

ret = setuid(uid);

603

528

if (ret == -1){

604

529

perror("setuid");

605

}

530

}

531

606

532

setgid(gid);

607

533

if (ret == -1){

608

534

perror("setgid");

609

535

}

610

536

611

if (plugindir == NULL){

612

dir = opendir(PDIR);

613

} else {

614

dir = opendir(plugindir);

615

}

616

537

dir = opendir(plugindir);

617

538

if(dir == NULL){

618

539

perror("Could not open plugin dir");

619

540

exitstatus = EXIT_FAILURE;

635

556

636

557

FD_ZERO(&rfds_all);

637

558

638

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

639

559

while(true){

640

560

dirst = readdir(dir);

641

561

642

/* All directory entries have been processed */

562

// All directory entries have been processed

643

563

if(dirst == NULL){

644

564

if (errno == EBADF){

645

565

perror("readdir");

651

571

652

572

d_name_len = strlen(dirst->d_name);

653

573

654

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

574

// Ignore dotfiles, backup files and other junk

655

575

{

656

576

bool bad_name = false;

657

577

672

592

break;

673

593

}

674

594

}

595

675

596

if(bad_name){

676

597

continue;

677

598

}

599

678

600

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

679

601

size_t suf_len = strlen(*suf);

680

602

if((d_name_len >= suf_len)

707

629

free(filename);

708

630

continue;

709

631

}

710

711

/* Ignore non-executable files */

632

712

633

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

713

634

if(debug){

714

635

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

717

638

free(filename);

718

639

continue;

719

640

}

720

721

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

641

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

722

642

if(p == NULL){

723

643

perror("getplugin");

724

644

free(filename);

734

654

}

735

655

{

736

656

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

737

plugin *g = getplugin(NULL);

657

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

738

658

if(g != NULL){

739

659

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

740

660

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

743

663

}

744

664

/* Add global environment variables */

745

665

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

746

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

666

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

747

667

perror("add_environment");

748

668

}

749

669

}

754

674

process, too. */

755

675

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

756

676

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

757

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

677

char *copy = strdup(*e);

678

if(copy == NULL){

679

perror("strdup");

680

continue;

681

}

682

if(not add_environment(p, copy)){

758

683

perror("add_environment");

759

684

}

760

685

}

761

686

}

762

687

763

int pipefd[2];

688

int pipefd[2];

764

689

ret = pipe(pipefd);

765

690

if (ret == -1){

766

691

perror("pipe");

767

692

exitstatus = EXIT_FAILURE;

768

693

goto fallback;

769

694

}

770

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

771

695

ret = set_cloexec_flag(pipefd[0]);

772

696

if(ret < 0){

773

697

perror("set_cloexec_flag");

787

711

exitstatus = EXIT_FAILURE;

788

712

goto fallback;

789

713

}

790

/* Starting a new process to be watched */

714

// Starting a new process to be watched

791

715

pid_t pid = fork();

792

716

if(pid == -1){

793

717

perror("fork");

831

755

}

832

756

/* no return */

833

757

}

834

/* Parent process */

835

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

758

/* parent process */

836

759

free(filename);

837

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

838

if (new_plugin == NULL){

839

perror("getplugin");

760

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

761

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

762

if (new_process == NULL){

763

perror("malloc");

840

764

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

841

765

if(ret < 0){

842

perror("sigprocmask");

766

perror("sigprocmask");

843

767

}

844

768

exitstatus = EXIT_FAILURE;

845

769

goto fallback;

846

770

}

847

771

848

new_plugin->pid = pid;

849

new_plugin->fd = pipefd[0];

850

772

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

773

.fd = pipefd[0],

774

.next = process_list };

775

// List handling

776

process_list = new_process;

851

777

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

852

778

has already completed */

853

779

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

857

783

goto fallback;

858

784

}

859

785

860

FD_SET(new_plugin->fd, &rfds_all);

786

FD_SET(new_process->fd, &rfds_all);

861

787

862

if (maxfd < new_plugin->fd){

863

maxfd = new_plugin->fd;

788

if (maxfd < new_process->fd){

789

maxfd = new_process->fd;

864

790

}

865

791

866

792

}

867

793

794

free_plugin_list(plugin_list);

795

868

796

closedir(dir);

869

797

dir = NULL;

870

871

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

872

if(p->pid != 0){

873

break;

874

}

875

if(p->next == NULL){

876

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

877

" directory?\n");

878

free_plugin_list();

879

}

798

799

if (process_list == NULL){

800

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

801

" directory?\n");

802

process_list = NULL;

880

803

}

881

882

/* Main loop while running plugins exist */

883

while(plugin_list){

804

while(process_list){

884

805

fd_set rfds = rfds_all;

885

806

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

886

807

if (select_ret == -1){

890

811

}

891

812

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

892

813

from one of them */

893

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

814

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

894

815

/* Is this process completely done? */

895

816

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

896

817

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

897

818

if(not WIFEXITED(proc->status)

898

819

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

899

820

/* Bad exit by plugin */

900

901

821

if(debug){

902

822

if(WIFEXITED(proc->status)){

903

823

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

912

832

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

913

833

}

914

834

}

915

916

835

/* Remove the plugin */

917

836

FD_CLR(proc->fd, &rfds_all);

918

919

837

/* Block signal while modifying process_list */

920

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

838

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

921

839

if(ret < 0){

922

840

perror("sigprocmask");

923

841

exitstatus = EXIT_FAILURE;

924

842

goto fallback;

925

843

}

926

free_plugin(proc);

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

}

927

857

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

928

858

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

929

859

NULL);

930

860

if(ret < 0){

931

861

perror("sigprocmask");

932

exitstatus = EXIT_FAILURE;

933

goto fallback;

934

}

935

936

if(plugin_list == NULL){

937

break;

938

}

939

continue;

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;

940

869

}

941

942

870

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

943

871

944

bool bret = print_out_password(proc->buffer,

945

proc->buffer_length);

872

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

946

873

if(not bret){

947

874

perror("print_out_password");

948

875

exitstatus = EXIT_FAILURE;

949

876

}

950

877

goto fallback;

951

878

}

952

953

879

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

954

880

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

955

881

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

985

911

986

912

fallback:

987

913

988

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

989

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

990

occured */

914

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

915

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

991

916

bool bret;

992

917

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

993

918

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

1006

931

}

1007

932

1008

933

if(custom_argv != NULL){

1009

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

934

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

1010

935

free(*arg);

1011

936

}

1012

937

free(custom_argv);

1013

938

}

939

free_plugin_list(plugin_list);

1014

940

1015

941

if(dir != NULL){

1016

942

closedir(dir);

1017

943

}

1018

944

1019

945

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

1020

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

1021

if(p->pid != 0){

1022

close(p->fd);

1023

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

1024

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

1025

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

1026

perror("kill");

1027

}

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");

1028

953

}

954

free(process_list->buffer);

955

free(process_list);

1029

956

}

1030

957

1031

958

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

1035

962

if(errno != ECHILD){

1036

963

perror("wait");

1037

964

}

1038

1039

free_plugin_list();

1040

1041

free(plugindir);

1042

free(argfile);

1043

965

1044

966

return exitstatus;

1045

967

}