/mandos/release : revision 24.1.67

65

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

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67

#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"

68

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

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

73

71

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

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75

struct plugin;

76

77

typedef struct plugin{

78

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

79

char **argv;

80

int argc;

81

char **environ;

82

int envc;

83

bool disabled;

84

85

/* Variables used for running processes*/

73

struct process;

74

75

typedef struct process{

86

76

pid_t pid;

87

77

int fd;

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78

char *buffer;

91

81

bool eof;

92

82

volatile bool completed;

93

83

volatile int status;

84

struct process *next;

85

} process;

86

87

typedef struct plugin{

88

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

89

char **argv;

90

int argc;

91

char **environ;

92

int envc;

93

bool disabled;

94

struct plugin *next;

95

} plugin;

96

97

static plugin *plugin_list = NULL;

98

99

/* Gets an 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){

97

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

98

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

104

99

if ((p->name == name)

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100

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

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101

return p;

121

116

122

117

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

123

118

.argc = 1,

119

.envc = 0,

124

120

.disabled = false,

125

.next = plugin_list };

121

.next = *plugin_list };

126

122

127

123

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

128

124

if (new_plugin->argv == NULL){

132

128

}

133

129

new_plugin->argv[0] = copy_name;

134

130

new_plugin->argv[1] = NULL;

135

131

136

132

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

137

133

if(new_plugin->environ == NULL){

138

134

free(copy_name);

141

137

return NULL;

142

138

}

143

139

new_plugin->environ[0] = NULL;

144

145

140

/* Append the new plugin to the list */

146

plugin_list = new_plugin;

141

*plugin_list = new_plugin;

147

142

return new_plugin;

148

143

}

149

144

179

174

}

180

175

181

176

/* Add to a plugin's environment */

182

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

177

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

183

178

if(p == NULL){

184

179

return false;

185

180

}

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) + 1);

194

if(new == NULL){

195

return false;

196

}

197

*e = new;

198

strcpy(*e, def);

199

}

200

return true;

201

}

202

}

203

181

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

204

182

}

205

183

184

206

185

/*

207

186

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

208

187

* Descriptor Flags".

219

198

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

220

199

}

221

200

201

process *process_list = NULL;

222

202

223

203

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

224

204

status. */

225

205

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

226

206

while(true){

227

plugin *proc = plugin_list;

207

process *proc = process_list;

228

208

int status;

229

209

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

230

210

if(pid == 0){

238

218

/* No child processes */

239

219

break;

240

220

}

241

221

242

222

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

243

223

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

244

224

proc = proc->next;

252

232

}

253

233

}

254

234

255

/* Prints out a password to stdout */

256

235

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

257

236

ssize_t ret;

237

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

238

length--;

239

}

258

240

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

259

241

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

260

242

length - written));

265

247

return true;

266

248

}

267

249

268

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

269

static void free_plugin(plugin *plugin_node){

270

271

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

272

free(*arg);

273

}

274

free(plugin_node->argv);

275

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

276

free(*env);

277

}

278

free(plugin_node->environ);

279

free(plugin_node->buffer);

280

281

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

282

if(plugin_node == plugin_list){

283

/* First one - simple */

284

plugin_list = plugin_list->next;

285

} else {

286

/* Second one or later */

287

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

288

if(p->next == plugin_node){

289

p->next = plugin_node->next;

290

break;

291

}

292

}

293

}

294

295

free(plugin_node);

296

}

297

298

static void free_plugin_list(void){

299

while(plugin_list != NULL){

300

free_plugin(plugin_list);

250

static void free_plugin_list(plugin *plugin_list){

251

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

252

next = plugin_list->next;

253

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

254

free(*arg);

255

}

256

free(plugin_list->argv);

257

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

258

free(*env);

259

}

260

free(plugin_list->environ);

261

free(plugin_list);

301

262

}

302

263

}

303

264

304

265

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

305

char *plugindir = NULL;

306

char *argfile = NULL;

266

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

267

const char *argfile = ARGFILE;

307

268

FILE *conffp;

308

269

size_t d_name_len;

309

270

DIR *dir = NULL;

341

302

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

342

303

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

343

304

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

344

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

305

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

345

306

.arg = "VAR=value",

346

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

347

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

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

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310

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

350

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

311

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

351

312

.arg = "PLUGIN:ENV=value",

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313

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

353

314

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

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315

.arg = "PLUGIN",

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316

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

356

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

357

.arg = "PLUGIN",

358

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

359

317

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

360

318

.arg = "DIRECTORY",

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319

.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 },

320

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

321

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

322

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

323

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

324

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

325

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

326

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

327

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

373

328

{ .name = NULL }

374

329

};

375

330

376

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

377

struct argp_state *state) {

331

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

332

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

333

pointer to our plugin list pointer. */

334

plugin **plugins = state->input;

378

335

switch (key) {

379

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

336

case 'g':

380

337

if (arg != NULL){

381

338

char *p;

382

339

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

383

340

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

384

341

continue;

385

342

}

386

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

343

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

387

344

perror("add_argument");

388

345

return ARGP_ERR_UNKNOWN;

389

346

}

390

347

}

391

348

}

392

349

break;

393

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

350

case 'e':

394

351

if(arg == NULL){

395

352

break;

396

353

}

399

356

if(envdef == NULL){

400

357

break;

401

358

}

402

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

359

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

403

360

perror("add_environment");

404

361

}

405

362

}

406

363

break;

407

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

364

case 'o':

408

365

if (arg != NULL){

409

366

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

410

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

367

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

411

368

break;

412

369

}

413

370

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

414

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

371

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

415

372

break;

416

373

}

417

char *p;

418

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

419

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

420

continue;

421

}

422

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

423

perror("add_argument");

424

return ARGP_ERR_UNKNOWN;

374

if(opt != NULL){

375

char *p;

376

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

377

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

378

continue;

379

}

380

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

381

perror("add_argument");

382

return ARGP_ERR_UNKNOWN;

383

}

425

384

}

426

385

}

427

386

}

428

387

break;

429

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

388

case 'f':

430

389

if(arg == NULL){

431

390

break;

432

391

}

440

399

break;

441

400

}

442

401

envdef++;

443

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

402

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

444

403

perror("add_environment");

445

404

}

446

405

}

447

406

break;

448

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

407

case 'd':

449

408

if (arg != NULL){

450

plugin *p = getplugin(arg);

409

plugin *p = getplugin(arg, plugins);

451

410

if(p == NULL){

452

411

return ARGP_ERR_UNKNOWN;

453

412

}

454

413

p->disabled = true;

455

414

}

456

415

break;

457

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

458

if (arg != NULL){

459

plugin *p = getplugin(arg);

460

if(p == NULL){

461

return ARGP_ERR_UNKNOWN;

462

}

463

p->disabled = false;

464

}

465

break;

466

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

467

plugindir = strdup(arg);

468

if(plugindir == NULL){

469

perror("strdup");

470

}

471

break;

472

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

473

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

474

break;

475

case 130: /* --userid */

416

case 128:

417

plugindir = arg;

418

break;

419

case 129:

476

420

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

477

421

break;

478

case 131: /* --groupid */

422

case 130:

479

423

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

480

424

break;

481

case 132: /* --debug */

425

case 131:

482

426

debug = true;

483

427

break;

484

428

case ARGP_KEY_ARG:

492

436

return 0;

493

437

}

494

438

495

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

496

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

497

error_t parse_opt_config_file (int key, char *arg,

498

__attribute__((unused))

499

struct argp_state *state) {

500

switch (key) {

501

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

502

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

503

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

504

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

505

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

506

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

507

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

508

break;

509

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

510

argfile = strdup(arg);

511

if(argfile == NULL){

512

perror("strdup");

513

}

514

break;

515

case 130: /* --userid */

516

case 131: /* --groupid */

517

case 132: /* --debug */

518

case ARGP_KEY_ARG:

519

case ARGP_KEY_END:

520

break;

521

default:

522

return ARGP_ERR_UNKNOWN;

523

}

524

return 0;

525

}

439

plugin *plugin_list = NULL;

526

440

527

struct argp argp = { .options = options,

528

.parser = parse_opt_config_file,

529

.args_doc = "",

441

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

442

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

530

443

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

531

444

532

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

533

config file location, if any. */

534

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

445

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

535

446

if (ret == ARGP_ERR_UNKNOWN){

536

447

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

537

448

exitstatus = EXIT_FAILURE;

538

449

goto fallback;

539

450

}

540

541

/* Reset to the normal argument parser */

542

argp.parser = parse_opt;

543

544

/* Open the configfile if available */

545

if (argfile == NULL){

546

conffp = fopen(AFILE, "r");

547

} else {

548

conffp = fopen(argfile, "r");

549

}

451

452

conffp = fopen(argfile, "r");

550

453

if(conffp != NULL){

551

454

char *org_line = NULL;

552

455

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

564

467

}

565

468

custom_argv[0] = argv[0];

566

469

custom_argv[1] = NULL;

567

568

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

569

commented text */

470

570

471

while(true){

571

472

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

572

473

if(sret == -1){

580

481

continue;

581

482

}

582

483

new_arg = strdup(p);

583

if(new_arg == NULL){

584

perror("strdup");

585

exitstatus = EXIT_FAILURE;

586

free(org_line);

587

goto fallback;

588

}

589

484

590

485

custom_argc += 1;

591

486

custom_argv = realloc(custom_argv, sizeof(char *)

592

487

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

601

496

}

602

497

}

603

498

free(org_line);

604

} else {

499

} else{

605

500

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

606

501

not affect opening plugins */

607

502

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

610

505

goto fallback;

611

506

}

612

507

}

613

/* If there was any arguments from configuration file,

614

pass them to parser as command arguments */

508

615

509

if(custom_argv != NULL){

616

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

617

0, NULL);

510

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

618

511

if (ret == ARGP_ERR_UNKNOWN){

619

512

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

620

513

exitstatus = EXIT_FAILURE;

622

515

}

623

516

}

624

517

625

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

626

config file */

627

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

628

if (ret == ARGP_ERR_UNKNOWN){

629

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

630

exitstatus = EXIT_FAILURE;

631

goto fallback;

632

}

633

634

518

if(debug){

635

519

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

636

520

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

645

529

}

646

530

}

647

531

648

/* Strip permissions down to nobody */

649

532

ret = setuid(uid);

650

533

if (ret == -1){

651

534

perror("setuid");

652

}

535

}

536

653

537

setgid(gid);

654

538

if (ret == -1){

655

539

perror("setgid");

656

540

}

657

541

658

if (plugindir == NULL){

659

dir = opendir(PDIR);

660

} else {

661

dir = opendir(plugindir);

662

}

663

542

dir = opendir(plugindir);

664

543

if(dir == NULL){

665

544

perror("Could not open plugin dir");

666

545

exitstatus = EXIT_FAILURE;

682

561

683

562

FD_ZERO(&rfds_all);

684

563

685

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

686

564

while(true){

687

565

dirst = readdir(dir);

688

566

689

/* All directory entries have been processed */

567

// All directory entries have been processed

690

568

if(dirst == NULL){

691

569

if (errno == EBADF){

692

570

perror("readdir");

698

576

699

577

d_name_len = strlen(dirst->d_name);

700

578

701

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

579

// Ignore dotfiles, backup files and other junk

702

580

{

703

581

bool bad_name = false;

704

582

719

597

break;

720

598

}

721

599

}

600

722

601

if(bad_name){

723

602

continue;

724

603

}

604

725

605

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

726

606

size_t suf_len = strlen(*suf);

727

607

if((d_name_len >= suf_len)

742

622

}

743

623

744

624

char *filename;

745

if(plugindir == NULL){

746

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

747

} else {

748

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

749

}

625

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

750

626

if(ret < 0){

751

627

perror("asprintf");

752

628

continue;

758

634

free(filename);

759

635

continue;

760

636

}

761

762

/* Ignore non-executable files */

637

763

638

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

764

639

if(debug){

765

640

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

768

643

free(filename);

769

644

continue;

770

645

}

771

772

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

646

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

773

647

if(p == NULL){

774

648

perror("getplugin");

775

649

free(filename);

785

659

}

786

660

{

787

661

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

788

plugin *g = getplugin(NULL);

662

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

789

663

if(g != NULL){

790

664

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

791

665

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

794

668

}

795

669

/* Add global environment variables */

796

670

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

797

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

671

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

798

672

perror("add_environment");

799

673

}

800

674

}

805

679

process, too. */

806

680

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

807

681

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

808

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

682

char *copy = strdup(*e);

683

if(copy == NULL){

684

perror("strdup");

685

continue;

686

}

687

if(not add_environment(p, copy)){

809

688

perror("add_environment");

810

689

}

811

690

}

818

697

exitstatus = EXIT_FAILURE;

819

698

goto fallback;

820

699

}

821

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

822

700

ret = set_cloexec_flag(pipefd[0]);

823

701

if(ret < 0){

824

702

perror("set_cloexec_flag");

838

716

exitstatus = EXIT_FAILURE;

839

717

goto fallback;

840

718

}

841

/* Starting a new process to be watched */

719

// Starting a new process to be watched

842

720

pid_t pid = fork();

843

721

if(pid == -1){

844

722

perror("fork");

882

760

}

883

761

/* no return */

884

762

}

885

/* Parent process */

886

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

763

/* parent process */

887

764

free(filename);

888

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

889

if (new_plugin == NULL){

890

perror("getplugin");

765

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

766

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

767

if (new_process == NULL){

768

perror("malloc");

891

769

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

892

770

if(ret < 0){

893

perror("sigprocmask");

771

perror("sigprocmask");

894

772

}

895

773

exitstatus = EXIT_FAILURE;

896

774

goto fallback;

897

775

}

898

776

899

new_plugin->pid = pid;

900

new_plugin->fd = pipefd[0];

901

777

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

778

.fd = pipefd[0],

779

.next = process_list };

780

// List handling

781

process_list = new_process;

902

782

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

903

783

has already completed */

904

784

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

908

788

goto fallback;

909

789

}

910

790

911

FD_SET(new_plugin->fd, &rfds_all);

791

FD_SET(new_process->fd, &rfds_all);

912

792

913

if (maxfd < new_plugin->fd){

914

maxfd = new_plugin->fd;

793

if (maxfd < new_process->fd){

794

maxfd = new_process->fd;

915

795

}

916

796

917

797

}

918

798

799

free_plugin_list(plugin_list);

800

plugin_list = NULL;

801

919

802

closedir(dir);

920

803

dir = NULL;

921

922

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

923

if(p->pid != 0){

924

break;

925

}

926

if(p->next == NULL){

927

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

928

" directory?\n");

929

free_plugin_list();

930

}

804

805

if (process_list == NULL){

806

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

807

" directory?\n");

808

process_list = NULL;

931

809

}

932

933

/* Main loop while running plugins exist */

934

while(plugin_list){

810

while(process_list){

935

811

fd_set rfds = rfds_all;

936

812

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

937

813

if (select_ret == -1){

941

817

}

942

818

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

943

819

from one of them */

944

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

820

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

945

821

/* Is this process completely done? */

946

822

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

947

823

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

948

824

if(not WIFEXITED(proc->status)

949

825

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

950

826

/* Bad exit by plugin */

951

952

827

if(debug){

953

828

if(WIFEXITED(proc->status)){

954

829

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

963

838

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

964

839

}

965

840

}

966

967

841

/* Remove the plugin */

968

842

FD_CLR(proc->fd, &rfds_all);

969

970

843

/* Block signal while modifying process_list */

971

844

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

972

845

if(ret < 0){

974

847

exitstatus = EXIT_FAILURE;

975

848

goto fallback;

976

849

}

977

free_plugin(proc);

850

/* Delete this process entry from the list */

851

if(process_list == proc){

852

/* First one - simple */

853

process_list = proc->next;

854

} else {

855

/* Second one or later */

856

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

857

if(p->next == proc){

858

p->next = proc->next;

859

break;

860

}

861

}

862

}

978

863

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

979

864

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

980

865

NULL);

981

866

if(ret < 0){

982

867

perror("sigprocmask");

983

exitstatus = EXIT_FAILURE;

984

goto fallback;

985

}

986

987

if(plugin_list == NULL){

988

break;

989

}

990

continue;

868

}

869

free(proc->buffer);

870

free(proc);

871

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

872

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

873

the process list */

874

break;

991

875

}

992

993

876

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

994

877

995

878

bool bret = print_out_password(proc->buffer,

1000

883

}

1001

884

goto fallback;

1002

885

}

1003

1004

886

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

1005

887

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

1006

888

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

1036

918

1037

919

fallback:

1038

920

1039

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

921

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

1040

922

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

1041

923

occured */

1042

924

bool bret;

1043

925

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

1044

926

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

1045

size_t len = strlen(passwordbuffer);

1046

/* Strip trailing newline */

1047

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

1048

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

1049

len--;

1050

}

1051

bret = print_out_password(passwordbuffer, len);

927

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

1052

928

if(not bret){

1053

929

perror("print_out_password");

1054

930

exitstatus = EXIT_FAILURE;

1068

944

}

1069

945

free(custom_argv);

1070

946

}

947

free_plugin_list(plugin_list);

1071

948

1072

949

if(dir != NULL){

1073

950

closedir(dir);

1074

951

}

1075

952

1076

953

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

1077

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

1078

if(p->pid != 0){

1079

close(p->fd);

1080

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

1081

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

1082

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

1083

perror("kill");

1084

}

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");

1085

961

}

962

free(process_list->buffer);

963

free(process_list);

1086

964

}

1087

965

1088

966

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

1092

970

if(errno != ECHILD){

1093

971

perror("wait");

1094

972

}

1095

1096

free_plugin_list();

1097

1098

free(plugindir);

1099

free(argfile);

1100

973

1101

974

return exitstatus;

1102

975

}