/mandos/release : revision 24.1.53

56

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

57

argp_state, struct argp,

58

argp_parse(), ARGP_ERR_UNKNOWN,

59

ARGP_KEY_END, ARGP_KEY_ARG,

60

error_t */

59

ARGP_KEY_END, ARGP_KEY_ARG, error_t */

61

60

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

62

61

sigaddset(), sigaction(),

63

62

sigprocmask(), SIG_BLOCK, SIGCHLD,

65

64

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

66

65

67

66

#define BUFFER_SIZE 256

68

69

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

70

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

67

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

71

68

72

69

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

73

70

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

74

71

75

struct plugin;

72

struct process;

73

74

typedef struct process{

75

pid_t pid;

76

int fd;

77

char *buffer;

78

size_t buffer_size;

79

size_t buffer_length;

80

bool eof;

81

bool completed;

82

int status;

83

struct process *next;

84

} process;

76

85

77

86

typedef struct plugin{

78

87

char *name; /* can be NULL or any plugin name */

81

90

char **environ;

82

91

int envc;

83

92

bool disabled;

84

85

/* Variables used for running processes*/

86

pid_t pid;

87

int fd;

88

char *buffer;

89

size_t buffer_size;

90

size_t buffer_length;

91

bool eof;

92

volatile bool completed;

93

volatile int status;

94

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;

111

105

if (new_plugin == NULL){

112

106

return NULL;

113

107

}

114

char *copy_name = NULL;

115

if(name != NULL){

116

copy_name = strdup(name);

117

if(copy_name == NULL){

118

return NULL;

119

}

120

}

121

122

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

108

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

123

109

.argc = 1,

110

.envc = 0,

124

111

.disabled = false,

125

.next = plugin_list };

112

.next = *plugin_list };

126

113

127

114

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

128

115

if (new_plugin->argv == NULL){

129

free(copy_name);

130

116

free(new_plugin);

131

117

return NULL;

132

118

}

133

new_plugin->argv[0] = copy_name;

119

new_plugin->argv[0] = name;

134

120

new_plugin->argv[1] = NULL;

135

121

136

122

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

137

123

if(new_plugin->environ == NULL){

138

free(copy_name);

139

124

free(new_plugin->argv);

140

125

free(new_plugin);

141

126

return NULL;

142

127

}

143

128

new_plugin->environ[0] = NULL;

144

145

129

/* Append the new plugin to the list */

146

plugin_list = new_plugin;

130

*plugin_list = new_plugin;

147

131

return new_plugin;

148

132

}

149

133

186

170

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

187

171

}

188

172

173

189

174

/*

190

175

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

191

176

* Descriptor Flags".

202

187

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

203

188

}

204

189

190

process *process_list = NULL;

205

191

206

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

192

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

207

193

status. */

208

194

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

209

while(true){

210

plugin *proc = plugin_list;

211

int status;

212

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

213

if(pid == 0){

214

/* Only still running child processes */

215

break;

216

}

217

if(pid == -1){

218

if (errno != ECHILD){

219

perror("waitpid");

220

}

221

/* No child processes */

222

break;

223

}

224

225

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

226

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

227

proc = proc->next;

228

}

229

if(proc == NULL){

230

/* Process not found in process list */

231

continue;

232

}

233

proc->status = status;

234

proc->completed = true;

235

}

195

process *proc = process_list;

196

int status;

197

pid_t pid = wait(&status);

198

if(pid == -1){

199

perror("wait");

200

return;

201

}

202

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

203

proc = proc->next;

204

}

205

if(proc == NULL){

206

/* Process not found in process list */

207

return;

208

}

209

proc->status = status;

210

proc->completed = true;

236

211

}

237

212

238

/* Prints out a password to stdout */

239

213

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

240

214

ssize_t ret;

241

215

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

251

225

return true;

252

226

}

253

227

254

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

255

static void free_plugin(plugin *plugin_node){

256

257

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

258

free(*arg);

259

}

260

free(plugin_node->argv);

261

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

262

free(*env);

263

}

264

free(plugin_node->environ);

265

free(plugin_node->buffer);

266

267

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

268

if(plugin_node == plugin_list){

269

/* First one - simple */

270

plugin_list = plugin_list->next;

271

} else {

272

/* Second one or later */

273

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

274

if(p->next == plugin_node){

275

p->next = plugin_node->next;

276

break;

277

}

228

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

229

if (argv == NULL){

230

*argc = 1;

231

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

232

if(argv == NULL){

233

return NULL;

278

234

}

279

}

280

281

free(plugin_node);

282

}

283

284

static void free_plugin_list(void){

285

while(plugin_list != NULL){

286

free_plugin(plugin_list);

287

}

235

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

236

argv[1] = NULL;

237

}

238

*argc += 1;

239

argv = realloc(argv, sizeof(char *)

240

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

241

if(argv == NULL){

242

return NULL;

243

}

244

argv[*argc-1] = arg;

245

argv[*argc] = NULL;

246

return argv;

288

247

}

289

248

290

249

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

291

char *plugindir = NULL;

292

char *argfile = NULL;

250

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

251

const char *argfile = ARGFILE;

293

252

FILE *conffp;

294

253

size_t d_name_len;

295

254

DIR *dir = NULL;

310

269

/* Establish a signal handler */

311

270

sigemptyset(&sigchld_action.sa_mask);

312

271

ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);

313

if(ret == -1){

272

if(ret < 0){

314

273

perror("sigaddset");

315

exitstatus = EXIT_FAILURE;

316

goto fallback;

274

exit(EXIT_FAILURE);

317

275

}

318

276

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

319

if(ret == -1){

277

if(ret < 0){

320

278

perror("sigaction");

321

exitstatus = EXIT_FAILURE;

322

goto fallback;

279

exit(EXIT_FAILURE);

323

280

}

324

281

325

282

/* The options we understand. */

342

299

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

343

300

.arg = "DIRECTORY",

344

301

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

345

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

346

.arg = "FILE",

347

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

348

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

349

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

350

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

351

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

352

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

353

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

354

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

355

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

302

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

303

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

304

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

305

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

306

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

307

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

308

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

309

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

356

310

{ .name = NULL }

357

311

};

358

312

359

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

360

struct argp_state *state) {

313

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

361

314

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

362

315

pointer to our plugin list pointer. */

316

plugin **plugins = state->input;

363

317

switch (key) {

364

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

318

case 'g':

365

319

if (arg != NULL){

366

320

char *p;

367

321

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

368

322

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

369

323

continue;

370

324

}

371

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

325

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

372

326

perror("add_argument");

373

327

return ARGP_ERR_UNKNOWN;

374

328

}

375

329

}

376

330

}

377

331

break;

378

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

332

case 'e':

379

333

if(arg == NULL){

380

334

break;

381

335

}

384

338

if(envdef == NULL){

385

339

break;

386

340

}

387

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

341

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

388

342

perror("add_environment");

389

343

}

390

344

}

391

345

break;

392

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

346

case 'o':

393

347

if (arg != NULL){

394

348

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

395

349

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

405

359

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

406

360

continue;

407

361

}

408

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

362

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

409

363

perror("add_argument");

410

364

return ARGP_ERR_UNKNOWN;

411

365

}

413

367

}

414

368

}

415

369

break;

416

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

370

case 'f':

417

371

if(arg == NULL){

418

372

break;

419

373

}

427

381

break;

428

382

}

429

383

envdef++;

430

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

384

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

431

385

perror("add_environment");

432

386

}

433

387

}

434

388

break;

435

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

389

case 'd':

436

390

if (arg != NULL){

437

plugin *p = getplugin(arg);

391

plugin *p = getplugin(arg, plugins);

438

392

if(p == NULL){

439

393

return ARGP_ERR_UNKNOWN;

440

394

}

441

395

p->disabled = true;

442

396

}

443

397

break;

444

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

445

plugindir = strdup(arg);

446

if(plugindir == NULL){

447

perror("strdup");

448

}

398

case 128:

399

plugindir = arg;

449

400

break;

450

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

451

argfile = strdup(arg);

452

if(argfile == NULL){

453

perror("strdup");

454

}

455

break;

456

case 130: /* --userid */

401

case 129:

457

402

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

458

403

break;

459

case 131: /* --groupid */

404

case 130:

460

405

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

461

406

break;

462

case 132: /* --debug */

407

case 131:

463

408

debug = true;

464

409

break;

465

410

case ARGP_KEY_ARG:

473

418

return 0;

474

419

}

475

420

421

plugin *plugin_list = NULL;

422

476

423

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

477

424

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

478

425

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

479

426

480

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

427

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

481

428

if (ret == ARGP_ERR_UNKNOWN){

482

429

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

483

430

exitstatus = EXIT_FAILURE;

484

goto fallback;

431

goto end;

485

432

}

486

433

487

/* Opens the configfile if aviable */

488

if (argfile == NULL){

489

conffp = fopen(AFILE, "r");

490

} else {

491

conffp = fopen(argfile, "r");

492

}

434

conffp = fopen(argfile, "r");

493

435

if(conffp != NULL){

494

436

char *org_line = NULL;

495

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

496

437

size_t size = 0;

497

438

ssize_t sret;

439

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

498

440

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

499

441

const char comment_delim[] = "#";

500

442

501

custom_argc = 1;

502

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

503

if(custom_argv == NULL){

504

perror("malloc");

505

exitstatus = EXIT_FAILURE;

506

goto fallback;

507

}

508

custom_argv[0] = argv[0];

509

custom_argv[1] = NULL;

510

511

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

512

commented text */

513

443

while(true){

514

444

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

515

445

if(sret == -1){

523

453

continue;

524

454

}

525

455

new_arg = strdup(p);

526

if(new_arg == NULL){

527

perror("strdup");

528

exitstatus = EXIT_FAILURE;

529

free(org_line);

530

goto fallback;

531

}

532

533

custom_argc += 1;

534

custom_argv = realloc(custom_argv, sizeof(char *)

535

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

536

if(custom_argv == NULL){

537

perror("realloc");

538

exitstatus = EXIT_FAILURE;

539

free(org_line);

540

goto fallback;

541

}

542

custom_argv[custom_argc-1] = new_arg;

543

custom_argv[custom_argc] = NULL;

456

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

457

if (custom_argv == NULL){

458

perror("add_to_argv");

459

exitstatus = EXIT_FAILURE;

460

goto end;

461

}

544

462

}

545

463

}

546

464

free(org_line);

550

468

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

551

469

perror("fopen");

552

470

exitstatus = EXIT_FAILURE;

553

goto fallback;

471

goto end;

554

472

}

555

473

}

556

/* If there was any arguments from configuration file,

557

pass them to parser as command arguments */

474

558

475

if(custom_argv != NULL){

559

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

476

custom_argv[0] = argv[0];

477

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

560

478

if (ret == ARGP_ERR_UNKNOWN){

561

479

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

562

480

exitstatus = EXIT_FAILURE;

563

goto fallback;

481

goto end;

564

482

}

565

483

}

566

484

577

495

}

578

496

}

579

497

}

580

581

/* Strip permissions down to nobody */

498

582

499

ret = setuid(uid);

583

500

if (ret == -1){

584

501

perror("setuid");

585

}

502

}

503

586

504

setgid(gid);

587

505

if (ret == -1){

588

506

perror("setgid");

589

507

}

590

591

if (plugindir == NULL){

592

dir = opendir(PDIR);

593

} else {

594

dir = opendir(plugindir);

595

}

596

508

509

dir = opendir(plugindir);

597

510

if(dir == NULL){

598

511

perror("Could not open plugin dir");

599

512

exitstatus = EXIT_FAILURE;

600

goto fallback;

513

goto end;

601

514

}

602

515

603

516

/* Set the FD_CLOEXEC flag on the directory, if possible */

608

521

if(ret < 0){

609

522

perror("set_cloexec_flag");

610

523

exitstatus = EXIT_FAILURE;

611

goto fallback;

524

goto end;

612

525

}

613

526

}

614

527

}

615

528

616

529

FD_ZERO(&rfds_all);

617

618

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

530

619

531

while(true){

620

532

dirst = readdir(dir);

621

533

624

536

if (errno == EBADF){

625

537

perror("readdir");

626

538

exitstatus = EXIT_FAILURE;

627

goto fallback;

539

goto end;

628

540

}

629

541

break;

630

542

}

652

564

break;

653

565

}

654

566

}

567

655

568

if(bad_name){

656

569

continue;

657

570

}

571

658

572

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

659

573

size_t suf_len = strlen(*suf);

660

574

if((d_name_len >= suf_len)

687

601

free(filename);

688

602

continue;

689

603

}

690

691

/* Ignore non-executable files */

604

692

605

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

693

606

if(debug){

694

607

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

697

610

free(filename);

698

611

continue;

699

612

}

700

701

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

613

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

702

614

if(p == NULL){

703

615

perror("getplugin");

704

616

free(filename);

714

626

}

715

627

{

716

628

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

717

plugin *g = getplugin(NULL);

629

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

718

630

if(g != NULL){

719

631

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

720

632

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

745

657

}

746

658

}

747

659

748

int pipefd[2];

660

int pipefd[2];

749

661

ret = pipe(pipefd);

750

662

if (ret == -1){

751

663

perror("pipe");

752

664

exitstatus = EXIT_FAILURE;

753

goto fallback;

665

goto end;

754

666

}

755

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

756

667

ret = set_cloexec_flag(pipefd[0]);

757

668

if(ret < 0){

758

669

perror("set_cloexec_flag");

759

670

exitstatus = EXIT_FAILURE;

760

goto fallback;

671

goto end;

761

672

}

762

673

ret = set_cloexec_flag(pipefd[1]);

763

674

if(ret < 0){

764

675

perror("set_cloexec_flag");

765

676

exitstatus = EXIT_FAILURE;

766

goto fallback;

677

goto end;

767

678

}

768

679

/* Block SIGCHLD until process is safely in process list */

769

680

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

770

681

if(ret < 0){

771

682

perror("sigprocmask");

772

683

exitstatus = EXIT_FAILURE;

773

goto fallback;

684

goto end;

774

685

}

775

686

// Starting a new process to be watched

776

687

pid_t pid = fork();

777

688

if(pid == -1){

778

689

perror("fork");

779

690

exitstatus = EXIT_FAILURE;

780

goto fallback;

691

goto end;

781

692

}

782

693

if(pid == 0){

783

694

/* this is the child process */

816

727

}

817

728

/* no return */

818

729

}

819

/* Parent process */

820

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

730

/* parent process */

821

731

free(filename);

822

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

823

if (new_plugin == NULL){

824

perror("getplugin");

732

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

733

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

734

if (new_process == NULL){

735

perror("malloc");

825

736

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

826

737

if(ret < 0){

827

perror("sigprocmask");

738

perror("sigprocmask");

828

739

}

829

740

exitstatus = EXIT_FAILURE;

830

goto fallback;

741

goto end;

831

742

}

832

743

833

new_plugin->pid = pid;

834

new_plugin->fd = pipefd[0];

835

744

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

745

.fd = pipefd[0],

746

.next = process_list };

747

// List handling

748

process_list = new_process;

836

749

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

837

750

has already completed */

838

751

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

839

752

if(ret < 0){

840

753

perror("sigprocmask");

841

754

exitstatus = EXIT_FAILURE;

842

goto fallback;

843

}

844

845

FD_SET(new_plugin->fd, &rfds_all);

846

847

if (maxfd < new_plugin->fd){

848

maxfd = new_plugin->fd;

849

}

850

755

goto end;

756

}

757

758

FD_SET(new_process->fd, &rfds_all);

759

760

if (maxfd < new_process->fd){

761

maxfd = new_process->fd;

762

}

763

764

}

765

766

/* Free the plugin list */

767

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

768

next = plugin_list->next;

769

free(plugin_list->argv);

770

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

771

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

772

free(*e);

773

}

774

}

775

free(plugin_list);

851

776

}

852

777

853

778

closedir(dir);

854

779

dir = NULL;

855

856

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

857

if(p->pid != 0){

858

break;

859

}

860

if(p->next == NULL){

861

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

862

" directory?\n");

863

free_plugin_list();

864

}

780

781

if (process_list == NULL){

782

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

783

" directory?\n");

784

process_list = NULL;

865

785

}

866

867

/* Main loop while running plugins exist */

868

while(plugin_list){

786

while(process_list){

869

787

fd_set rfds = rfds_all;

870

788

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

871

789

if (select_ret == -1){

872

790

perror("select");

873

791

exitstatus = EXIT_FAILURE;

874

goto fallback;

792

goto end;

875

793

}

876

794

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

877

795

from one of them */

878

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

796

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

879

797

/* Is this process completely done? */

880

798

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

881

799

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

882

800

if(not WIFEXITED(proc->status)

883

801

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

884

802

/* Bad exit by plugin */

885

886

803

if(debug){

887

804

if(WIFEXITED(proc->status)){

888

805

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

897

814

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

898

815

}

899

816

}

900

901

817

/* Remove the plugin */

902

818

FD_CLR(proc->fd, &rfds_all);

903

904

819

/* Block signal while modifying process_list */

905

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

820

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

906

821

if(ret < 0){

907

822

perror("sigprocmask");

908

823

exitstatus = EXIT_FAILURE;

909

goto fallback;

910

}

911

free_plugin(proc);

824

goto end;

825

}

826

/* Delete this process entry from the list */

827

if(process_list == proc){

828

/* First one - simple */

829

process_list = proc->next;

830

} else {

831

/* Second one or later */

832

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

833

if(p->next == proc){

834

p->next = proc->next;

835

break;

836

}

837

}

838

}

912

839

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

913

840

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

914

841

NULL);

915

842

if(ret < 0){

916

843

perror("sigprocmask");

917

exitstatus = EXIT_FAILURE;

918

goto fallback;

919

}

920

921

if(plugin_list == NULL){

922

break;

923

}

924

continue;

844

}

845

free(proc->buffer);

846

free(proc);

847

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

848

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

849

the process list */

850

break;

925

851

}

926

927

852

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

928

853

929

bool bret = print_out_password(proc->buffer,

930

proc->buffer_length);

854

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

931

855

if(not bret){

932

856

perror("print_out_password");

933

857

exitstatus = EXIT_FAILURE;

934

858

}

935

goto fallback;

859

goto end;

936

860

}

937

938

861

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

939

862

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

940

863

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

947

870

if (proc->buffer == NULL){

948

871

perror("malloc");

949

872

exitstatus = EXIT_FAILURE;

950

goto fallback;

873

goto end;

951

874

}

952

875

proc->buffer_size += BUFFER_SIZE;

953

876

}

968

891

}

969

892

970

893

971

fallback:

894

end:

972

895

973

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

974

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

975

occured */

896

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

897

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

976

898

bool bret;

977

899

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

978

900

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

980

902

if(not bret){

981

903

perror("print_out_password");

982

904

exitstatus = EXIT_FAILURE;

905

goto end;

983

906

}

984

907

}

985

908

986

909

/* Restore old signal handler */

987

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

988

if(ret == -1){

989

perror("sigaction");

990

exitstatus = EXIT_FAILURE;

991

}

992

993

if(custom_argv != NULL){

994

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

995

free(*arg);

910

sigaction(SIGCHLD, &old_sigchld_action, NULL);

911

912

free(custom_argv);

913

914

/* Free the plugin list */

915

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

916

next = plugin_list->next;

917

free(plugin_list->argv);

918

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

919

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

920

free(*e);

921

}

996

922

}

997

free(custom_argv);

923

free(plugin_list->environ);

924

free(plugin_list);

998

925

}

999

926

1000

927

if(dir != NULL){

1002

929

}

1003

930

1004

931

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

1005

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

1006

if(p->pid != 0){

1007

close(p->fd);

1008

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

1009

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

1010

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

1011

perror("kill");

1012

}

932

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

933

next = process_list->next;

934

close(process_list->fd);

935

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

936

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

937

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

938

perror("kill");

1013

939

}

940

free(process_list->buffer);

941

free(process_list);

1014

942

}

1015

943

1016

944

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

1020

948

if(errno != ECHILD){

1021

949

perror("wait");

1022

950

}

1023

1024

free_plugin_list();

1025

1026

free(plugindir);

1027

free(argfile);

1028

951

1029

952

return exitstatus;

1030

953

}