/mandos/release : revision 24.1.63

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 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){

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;

121

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) + 1);

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;

225

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

226

length--;

227

}

258

228

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

259

229

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

260

230

length - written));

265

235

return true;

266

236

}

267

237

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

}

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;

292

244

}

293

}

294

295

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;

296

257

}

297

258

298

static void free_plugin_list(void){

299

while(plugin_list != NULL){

300

free_plugin(plugin_list);

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

271

}

302

272

}

303

273

304

274

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

305

char *plugindir = NULL;

306

char *argfile = NULL;

275

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

276

const char *argfile = ARGFILE;

307

277

FILE *conffp;

308

278

size_t d_name_len;

309

279

DIR *dir = NULL;

341

311

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

342

312

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

343

313

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

344

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

314

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

345

315

.arg = "VAR=value",

346

316

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

347

317

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

348

318

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

349

319

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

350

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

320

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

351

321

.arg = "PLUGIN:ENV=value",

352

322

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

353

323

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

354

324

.arg = "PLUGIN",

355

325

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

356

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

357

.arg = "PLUGIN",

358

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

359

326

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

360

327

.arg = "DIRECTORY",

361

328

.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 },

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 },

373

337

{ .name = NULL }

374

338

};

375

339

376

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

377

struct argp_state *state) {

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;

378

344

switch (key) {

379

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

345

case 'g':

380

346

if (arg != NULL){

381

347

char *p;

382

348

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

383

349

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

384

350

continue;

385

351

}

386

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

352

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

387

353

perror("add_argument");

388

354

return ARGP_ERR_UNKNOWN;

389

355

}

390

356

}

391

357

}

392

358

break;

393

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

359

case 'e':

394

360

if(arg == NULL){

395

361

break;

396

362

}

397

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

398

perror("add_environment");

363

{

364

char *envdef = strdup(arg);

365

if(envdef == NULL){

366

break;

367

}

368

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

369

perror("add_environment");

370

}

399

371

}

400

372

break;

401

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

373

case 'o':

402

374

if (arg != NULL){

403

375

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

404

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

376

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

405

377

break;

406

378

}

407

379

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

408

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

380

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

409

381

break;

410

382

}

411

char *p;

412

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

413

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

414

continue;

415

}

416

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

417

perror("add_argument");

418

return ARGP_ERR_UNKNOWN;

383

if(opt != NULL){

384

char *p;

385

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

386

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

387

continue;

388

}

389

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

390

perror("add_argument");

391

return ARGP_ERR_UNKNOWN;

392

}

419

393

}

420

394

}

421

395

}

422

396

break;

423

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

397

case 'f':

424

398

if(arg == NULL){

425

399

break;

426

400

}

429

403

if(envdef == NULL){

430

404

break;

431

405

}

432

*envdef = '\0';

433

if(not add_environment(getplugin(arg), envdef+1, true)){

406

char *p_name = strndup(arg, (size_t) (envdef-arg));

407

if(p_name == NULL){

408

break;

409

}

410

envdef++;

411

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

434

412

perror("add_environment");

435

413

}

436

414

}

437

415

break;

438

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

416

case 'd':

439

417

if (arg != NULL){

440

plugin *p = getplugin(arg);

418

plugin *p = getplugin(arg, plugins);

441

419

if(p == NULL){

442

420

return ARGP_ERR_UNKNOWN;

443

421

}

444

422

p->disabled = true;

445

423

}

446

424

break;

447

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

448

if (arg != NULL){

449

plugin *p = getplugin(arg);

450

if(p == NULL){

451

return ARGP_ERR_UNKNOWN;

452

}

453

p->disabled = false;

454

}

455

break;

456

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

457

free(plugindir);

458

plugindir = strdup(arg);

459

if(plugindir == NULL){

460

perror("strdup");

461

}

462

break;

463

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

464

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

465

break;

466

case 130: /* --userid */

425

case 128:

426

plugindir = arg;

427

break;

428

case 129:

467

429

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

468

430

break;

469

case 131: /* --groupid */

431

case 130:

470

432

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

471

433

break;

472

case 132: /* --debug */

434

case 131:

473

435

debug = true;

474

436

break;

475

437

case ARGP_KEY_ARG:

476

/* Cryptsetup always passes an argument, which is an empty

477

string if "none" was specified in /etc/crypttab. So if

478

argument was empty, we ignore it silently. */

479

if(arg[0] != '\0'){

480

fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);

481

}

482

break;

483

case ARGP_KEY_END:

484

break;

485

default:

486

return ARGP_ERR_UNKNOWN;

487

}

488

return 0;

489

}

490

491

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

492

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

493

error_t parse_opt_config_file (int key, char *arg,

494

__attribute__((unused))

495

struct argp_state *state) {

496

switch (key) {

497

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

498

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

499

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

500

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

501

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

502

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

503

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

504

break;

505

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

506

free(argfile);

507

argfile = strdup(arg);

508

if(argfile == NULL){

509

perror("strdup");

510

}

511

break;

512

case 130: /* --userid */

513

case 131: /* --groupid */

514

case 132: /* --debug */

515

case ARGP_KEY_ARG:

516

case ARGP_KEY_END:

517

break;

518

default:

519

return ARGP_ERR_UNKNOWN;

520

}

521

return 0;

522

}

523

524

struct argp argp = { .options = options,

525

.parser = parse_opt_config_file,

526

.args_doc = "",

438

fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);

439

break;

440

case ARGP_KEY_END:

441

break;

442

default:

443

return ARGP_ERR_UNKNOWN;

444

}

445

return 0;

446

}

447

448

plugin *plugin_list = NULL;

449

450

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

451

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

527

452

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

528

453

529

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

530

config file location, if any. */

531

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

454

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

532

455

if (ret == ARGP_ERR_UNKNOWN){

533

456

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

534

457

exitstatus = EXIT_FAILURE;

535

458

goto fallback;

536

459

}

537

538

/* Reset to the normal argument parser */

539

argp.parser = parse_opt;

540

541

/* Open the configfile if available */

542

if (argfile == NULL){

543

conffp = fopen(AFILE, "r");

544

} else {

545

conffp = fopen(argfile, "r");

546

}

460

461

conffp = fopen(argfile, "r");

547

462

if(conffp != NULL){

548

463

char *org_line = NULL;

549

464

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

552

467

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

553

468

const char comment_delim[] = "#";

554

469

555

custom_argc = 1;

556

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

557

if(custom_argv == NULL){

558

perror("malloc");

559

exitstatus = EXIT_FAILURE;

560

goto fallback;

561

}

562

custom_argv[0] = argv[0];

563

custom_argv[1] = NULL;

564

565

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

566

commented text */

567

470

while(true){

568

471

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

569

472

if(sret == -1){

577

480

continue;

578

481

}

579

482

new_arg = strdup(p);

580

if(new_arg == NULL){

581

perror("strdup");

582

exitstatus = EXIT_FAILURE;

583

free(org_line);

584

goto fallback;

585

}

586

587

custom_argc += 1;

588

custom_argv = realloc(custom_argv, sizeof(char *)

589

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

590

if(custom_argv == NULL){

591

perror("realloc");

592

exitstatus = EXIT_FAILURE;

593

free(org_line);

594

goto fallback;

595

}

596

custom_argv[custom_argc-1] = new_arg;

597

custom_argv[custom_argc] = NULL;

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

}

598

489

}

599

490

}

600

491

free(org_line);

601

} else {

492

} else{

602

493

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

603

494

not affect opening plugins */

604

495

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

607

498

goto fallback;

608

499

}

609

500

}

610

/* If there was any arguments from configuration file,

611

pass them to parser as command arguments */

501

612

502

if(custom_argv != NULL){

613

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

614

0, NULL);

503

custom_argv[0] = argv[0];

504

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

615

505

if (ret == ARGP_ERR_UNKNOWN){

616

506

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

617

507

exitstatus = EXIT_FAILURE;

619

509

}

620

510

}

621

511

622

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

623

config file */

624

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

625

if (ret == ARGP_ERR_UNKNOWN){

626

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

627

exitstatus = EXIT_FAILURE;

628

goto fallback;

629

}

630

631

512

if(debug){

632

513

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

633

514

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

642

523

}

643

524

}

644

525

645

/* Strip permissions down to nobody */

646

526

ret = setuid(uid);

647

527

if (ret == -1){

648

528

perror("setuid");

649

}

529

}

530

650

531

setgid(gid);

651

532

if (ret == -1){

652

533

perror("setgid");

653

534

}

654

535

655

if (plugindir == NULL){

656

dir = opendir(PDIR);

657

} else {

658

dir = opendir(plugindir);

659

}

660

536

dir = opendir(plugindir);

661

537

if(dir == NULL){

662

538

perror("Could not open plugin dir");

663

539

exitstatus = EXIT_FAILURE;

679

555

680

556

FD_ZERO(&rfds_all);

681

557

682

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

683

558

while(true){

684

559

dirst = readdir(dir);

685

560

686

/* All directory entries have been processed */

561

// All directory entries have been processed

687

562

if(dirst == NULL){

688

563

if (errno == EBADF){

689

564

perror("readdir");

695

570

696

571

d_name_len = strlen(dirst->d_name);

697

572

698

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

573

// Ignore dotfiles, backup files and other junk

699

574

{

700

575

bool bad_name = false;

701

576

716

591

break;

717

592

}

718

593

}

594

719

595

if(bad_name){

720

596

continue;

721

597

}

598

722

599

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

723

600

size_t suf_len = strlen(*suf);

724

601

if((d_name_len >= suf_len)

739

616

}

740

617

741

618

char *filename;

742

if(plugindir == NULL){

743

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

744

} else {

745

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

746

}

619

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

747

620

if(ret < 0){

748

621

perror("asprintf");

749

622

continue;

755

628

free(filename);

756

629

continue;

757

630

}

758

759

/* Ignore non-executable files */

631

760

632

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

761

633

if(debug){

762

634

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

765

637

free(filename);

766

638

continue;

767

639

}

768

769

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

640

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

770

641

if(p == NULL){

771

642

perror("getplugin");

772

643

free(filename);

782

653

}

783

654

{

784

655

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

785

plugin *g = getplugin(NULL);

656

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

786

657

if(g != NULL){

787

658

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

788

659

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

791

662

}

792

663

/* Add global environment variables */

793

664

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

794

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

665

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

795

666

perror("add_environment");

796

667

}

797

668

}

802

673

process, too. */

803

674

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

804

675

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

805

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

676

char *copy = strdup(*e);

677

if(copy == NULL){

678

perror("strdup");

679

continue;

680

}

681

if(not add_environment(p, copy)){

806

682

perror("add_environment");

807

683

}

808

684

}

815

691

exitstatus = EXIT_FAILURE;

816

692

goto fallback;

817

693

}

818

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

819

694

ret = set_cloexec_flag(pipefd[0]);

820

695

if(ret < 0){

821

696

perror("set_cloexec_flag");

835

710

exitstatus = EXIT_FAILURE;

836

711

goto fallback;

837

712

}

838

/* Starting a new process to be watched */

713

// Starting a new process to be watched

839

714

pid_t pid = fork();

840

715

if(pid == -1){

841

716

perror("fork");

879

754

}

880

755

/* no return */

881

756

}

882

/* Parent process */

883

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

757

/* parent process */

884

758

free(filename);

885

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

886

if (new_plugin == NULL){

887

perror("getplugin");

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");

888

763

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

889

764

if(ret < 0){

890

perror("sigprocmask");

765

perror("sigprocmask");

891

766

}

892

767

exitstatus = EXIT_FAILURE;

893

768

goto fallback;

894

769

}

895

770

896

new_plugin->pid = pid;

897

new_plugin->fd = pipefd[0];

898

771

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

772

.fd = pipefd[0],

773

.next = process_list };

774

// List handling

775

process_list = new_process;

899

776

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

900

777

has already completed */

901

778

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

905

782

goto fallback;

906

783

}

907

784

908

FD_SET(new_plugin->fd, &rfds_all);

785

FD_SET(new_process->fd, &rfds_all);

909

786

910

if (maxfd < new_plugin->fd){

911

maxfd = new_plugin->fd;

787

if (maxfd < new_process->fd){

788

maxfd = new_process->fd;

912

789

}

913

790

914

791

}

915

792

793

free_plugin_list(plugin_list);

794

plugin_list = NULL;

795

916

796

closedir(dir);

917

797

dir = NULL;

918

919

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

920

if(p->pid != 0){

921

break;

922

}

923

if(p->next == NULL){

924

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

925

" directory?\n");

926

free_plugin_list();

927

}

798

799

if (process_list == NULL){

800

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

801

" directory?\n");

802

process_list = NULL;

928

803

}

929

930

/* Main loop while running plugins exist */

931

while(plugin_list){

804

while(process_list){

932

805

fd_set rfds = rfds_all;

933

806

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

934

807

if (select_ret == -1){

938

811

}

939

812

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

940

813

from one of them */

941

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

814

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

942

815

/* Is this process completely done? */

943

816

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

944

817

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

945

818

if(not WIFEXITED(proc->status)

946

819

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

947

820

/* Bad exit by plugin */

948

949

821

if(debug){

950

822

if(WIFEXITED(proc->status)){

951

823

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

960

832

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

961

833

}

962

834

}

963

964

835

/* Remove the plugin */

965

836

FD_CLR(proc->fd, &rfds_all);

966

967

837

/* Block signal while modifying process_list */

968

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

838

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

969

839

if(ret < 0){

970

840

perror("sigprocmask");

971

841

exitstatus = EXIT_FAILURE;

972

842

goto fallback;

973

843

}

974

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

}

975

857

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

976

858

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

977

859

NULL);

978

860

if(ret < 0){

979

861

perror("sigprocmask");

980

exitstatus = EXIT_FAILURE;

981

goto fallback;

982

}

983

984

if(plugin_list == NULL){

985

break;

986

}

987

988

plugin *next_plugin = proc->next;

989

free_plugin(proc);

990

proc = next_plugin;

991

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;

992

869

}

993

994

870

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

995

871

996

bool bret = print_out_password(proc->buffer,

997

proc->buffer_length);

872

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

998

873

if(not bret){

999

874

perror("print_out_password");

1000

875

exitstatus = EXIT_FAILURE;

1001

876

}

1002

877

goto fallback;

1003

878

}

1004

1005

879

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

1006

880

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

1007

881

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

1008

proc = proc->next;

1009

882

continue;

1010

883

}

1011

884

/* Before reading, make the process' data buffer large enough */

1024

897

BUFFER_SIZE);

1025

898

if(ret < 0){

1026

899

/* Read error from this process; ignore the error */

1027

proc = proc->next;

1028

900

continue;

1029

901

}

1030

902

if(ret == 0){

1039

911

1040

912

fallback:

1041

913

1042

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

1043

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

1044

occured */

914

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

915

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

1045

916

bool bret;

1046

917

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

1047

918

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

1048

size_t len = strlen(passwordbuffer);

1049

/* Strip trailing newline */

1050

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

1051

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

1052

len--;

1053

}

1054

bret = print_out_password(passwordbuffer, len);

919

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

1055

920

if(not bret){

1056

921

perror("print_out_password");

1057

922

exitstatus = EXIT_FAILURE;

1066

931

}

1067

932

1068

933

if(custom_argv != NULL){

1069

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

934

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

1070

935

free(*arg);

1071

936

}

1072

937

free(custom_argv);

1073

938

}

939

free_plugin_list(plugin_list);

1074

940

1075

941

if(dir != NULL){

1076

942

closedir(dir);

1077

943

}

1078

944

1079

945

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

1080

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

1081

if(p->pid != 0){

1082

close(p->fd);

1083

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

1084

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

1085

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

1086

perror("kill");

1087

}

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");

1088

953

}

954

free(process_list->buffer);

955

free(process_list);

1089

956

}

1090

957

1091

958

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

1095

962

if(errno != ECHILD){

1096

963

perror("wait");

1097

964

}

1098

1099

free_plugin_list();

1100

1101

free(plugindir);

1102

free(argfile);

1103

965

1104

966

return exitstatus;

1105

967

}