/mandos/trunk : revision 24.1.65

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

57

argp_state, struct argp,

58

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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sigaddset(), sigaction(),

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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"

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#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;

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74

typedef struct process{

75

pid_t pid;

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int fd;

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char *buffer;

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size_t buffer_size;

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size_t buffer_length;

80

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;

84

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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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;

118

112

return NULL;

119

113

}

120

114

}

121

115

122

116

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

123

117

.argc = 1,

118

.envc = 0,

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119

.disabled = false,

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.next = plugin_list };

120

.next = *plugin_list };

126

121

127

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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;

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137

}

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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;

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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){

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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 */

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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 processes as completed when it exits, and save its exit

224

203

status. */

225

204

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

205

process *proc = process_list;

226

206

while(true){

227

plugin *proc = plugin_list;

228

207

int status;

229

208

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

230

209

if(pid == 0){

231

/* Only still running child processes */

232

210

break;

233

211

}

234

212

if(pid == -1){

235

213

if (errno != ECHILD){

236

214

perror("waitpid");

237

215

}

238

/* No child processes */

239

break;

216

return;

240

217

}

241

218

242

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

243

219

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

244

220

proc = proc->next;

245

221

}

252

228

}

253

229

}

254

230

255

/* Prints out a password to stdout */

256

231

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

257

232

ssize_t ret;

258

233

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

268

243

return true;

269

244

}

270

245

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

}

246

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

247

if (argv == NULL){

248

*argc = 1;

249

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

250

if(argv == NULL){

251

return NULL;

295

252

}

296

}

297

298

free(plugin_node);

253

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

254

argv[1] = NULL;

255

}

256

*argc += 1;

257

argv = realloc(argv, sizeof(char *)

258

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

259

if(argv == NULL){

260

return NULL;

261

}

262

argv[*argc-1] = arg;

263

argv[*argc] = NULL;

264

return argv;

299

265

}

300

266

301

static void free_plugin_list(void){

302

while(plugin_list != NULL){

303

free_plugin(plugin_list);

267

static void free_plugin_list(plugin *plugin_list){

268

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

269

next = plugin_list->next;

270

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

271

free(*arg);

272

}

273

free(plugin_list->argv);

274

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

275

free(*env);

276

}

277

free(plugin_list->environ);

278

free(plugin_list);

304

279

}

305

280

}

306

281

307

282

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

308

char *plugindir = NULL;

309

char *argfile = NULL;

283

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

284

const char *argfile = ARGFILE;

310

285

FILE *conffp;

311

286

size_t d_name_len;

312

287

DIR *dir = NULL;

344

319

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

345

320

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

346

321

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

347

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

322

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

348

323

.arg = "VAR=value",

349

324

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

350

325

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

351

326

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

352

327

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

353

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

328

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

354

329

.arg = "PLUGIN:ENV=value",

355

330

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

356

331

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

357

332

.arg = "PLUGIN",

358

333

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

359

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

360

.arg = "PLUGIN",

361

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

362

334

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

363

335

.arg = "DIRECTORY",

364

336

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

365

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

366

.arg = "FILE",

367

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

368

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

369

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

370

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

371

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

372

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

373

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

374

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

375

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

337

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

338

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

339

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

340

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

341

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

342

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

343

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

344

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

376

345

{ .name = NULL }

377

346

};

378

347

379

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

380

struct argp_state *state) {

348

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

349

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

350

pointer to our plugin list pointer. */

351

plugin **plugins = state->input;

381

352

switch (key) {

382

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

353

case 'g':

383

354

if (arg != NULL){

384

355

char *p;

385

356

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

386

357

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

387

358

continue;

388

359

}

389

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

360

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

390

361

perror("add_argument");

391

362

return ARGP_ERR_UNKNOWN;

392

363

}

393

364

}

394

365

}

395

366

break;

396

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

367

case 'e':

397

368

if(arg == NULL){

398

369

break;

399

370

}

402

373

if(envdef == NULL){

403

374

break;

404

375

}

405

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

376

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

406

377

perror("add_environment");

407

378

}

408

379

}

409

380

break;

410

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

381

case 'o':

411

382

if (arg != NULL){

412

383

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

413

384

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

423

394

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

424

395

continue;

425

396

}

426

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

397

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

427

398

perror("add_argument");

428

399

return ARGP_ERR_UNKNOWN;

429

400

}

431

402

}

432

403

}

433

404

break;

434

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

405

case 'f':

435

406

if(arg == NULL){

436

407

break;

437

408

}

445

416

break;

446

417

}

447

418

envdef++;

448

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

419

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

449

420

perror("add_environment");

450

421

}

451

422

}

452

423

break;

453

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

424

case 'd':

454

425

if (arg != NULL){

455

plugin *p = getplugin(arg);

426

plugin *p = getplugin(arg, plugins);

456

427

if(p == NULL){

457

428

return ARGP_ERR_UNKNOWN;

458

429

}

459

430

p->disabled = true;

460

431

}

461

432

break;

462

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

463

if (arg != NULL){

464

plugin *p = getplugin(arg);

465

if(p == NULL){

466

return ARGP_ERR_UNKNOWN;

467

}

468

p->disabled = false;

469

}

470

break;

471

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

472

plugindir = strdup(arg);

473

if(plugindir == NULL){

474

perror("strdup");

475

}

476

break;

477

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

478

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

479

break;

480

case 130: /* --userid */

433

case 128:

434

plugindir = arg;

435

break;

436

case 129:

481

437

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

482

438

break;

483

case 131: /* --groupid */

439

case 130:

484

440

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

485

441

break;

486

case 132: /* --debug */

442

case 131:

487

443

debug = true;

488

444

break;

489

445

case ARGP_KEY_ARG:

497

453

return 0;

498

454

}

499

455

500

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

501

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

502

error_t parse_opt_config_file (int key, char *arg,

503

__attribute__((unused))

504

struct argp_state *state) {

505

switch (key) {

506

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

507

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

508

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

509

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

510

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

511

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

512

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

513

break;

514

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

515

argfile = strdup(arg);

516

if(argfile == NULL){

517

perror("strdup");

518

}

519

break;

520

case 130: /* --userid */

521

case 131: /* --groupid */

522

case 132: /* --debug */

523

case ARGP_KEY_ARG:

524

case ARGP_KEY_END:

525

break;

526

default:

527

return ARGP_ERR_UNKNOWN;

528

}

529

return 0;

530

}

456

plugin *plugin_list = NULL;

531

457

532

struct argp argp = { .options = options,

533

.parser = parse_opt_config_file,

534

.args_doc = "",

458

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

459

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

535

460

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

536

461

537

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

538

config file location, if any. */

539

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

462

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

540

463

if (ret == ARGP_ERR_UNKNOWN){

541

464

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

542

465

exitstatus = EXIT_FAILURE;

543

466

goto fallback;

544

467

}

545

546

/* Reset to the normal argument parser */

547

argp.parser = parse_opt;

548

549

/* Open the configfile if available */

550

if (argfile == NULL){

551

conffp = fopen(AFILE, "r");

552

} else {

553

conffp = fopen(argfile, "r");

554

}

468

469

conffp = fopen(argfile, "r");

555

470

if(conffp != NULL){

556

471

char *org_line = NULL;

557

472

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

560

475

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

561

476

const char comment_delim[] = "#";

562

477

563

custom_argc = 1;

564

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

565

if(custom_argv == NULL){

566

perror("malloc");

567

exitstatus = EXIT_FAILURE;

568

goto fallback;

569

}

570

custom_argv[0] = argv[0];

571

custom_argv[1] = NULL;

572

573

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

574

commented text */

575

478

while(true){

576

479

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

577

480

if(sret == -1){

585

488

continue;

586

489

}

587

490

new_arg = strdup(p);

588

if(new_arg == NULL){

589

perror("strdup");

590

exitstatus = EXIT_FAILURE;

591

free(org_line);

592

goto fallback;

593

}

594

595

custom_argc += 1;

596

custom_argv = realloc(custom_argv, sizeof(char *)

597

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

598

if(custom_argv == NULL){

599

perror("realloc");

600

exitstatus = EXIT_FAILURE;

601

free(org_line);

602

goto fallback;

603

}

604

custom_argv[custom_argc-1] = new_arg;

605

custom_argv[custom_argc] = NULL;

491

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

492

if (custom_argv == NULL){

493

perror("add_to_argv");

494

exitstatus = EXIT_FAILURE;

495

goto fallback;

496

}

606

497

}

607

498

}

608

499

free(org_line);

609

} else {

500

} else{

610

501

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

611

502

not affect opening plugins */

612

503

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

615

506

goto fallback;

616

507

}

617

508

}

618

/* If there was any arguments from configuration file,

619

pass them to parser as command arguments */

509

620

510

if(custom_argv != NULL){

621

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

622

0, NULL);

511

custom_argv[0] = argv[0];

512

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

623

513

if (ret == ARGP_ERR_UNKNOWN){

624

514

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

625

515

exitstatus = EXIT_FAILURE;

627

517

}

628

518

}

629

519

630

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

631

config file */

632

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

633

if (ret == ARGP_ERR_UNKNOWN){

634

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

635

exitstatus = EXIT_FAILURE;

636

goto fallback;

637

}

638

639

520

if(debug){

640

521

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

641

522

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

650

531

}

651

532

}

652

533

653

/* Strip permissions down to nobody */

654

534

ret = setuid(uid);

655

535

if (ret == -1){

656

536

perror("setuid");

657

}

537

}

538

658

539

setgid(gid);

659

540

if (ret == -1){

660

541

perror("setgid");

661

542

}

662

543

663

if (plugindir == NULL){

664

dir = opendir(PDIR);

665

} else {

666

dir = opendir(plugindir);

667

}

668

544

dir = opendir(plugindir);

669

545

if(dir == NULL){

670

546

perror("Could not open plugin dir");

671

547

exitstatus = EXIT_FAILURE;

687

563

688

564

FD_ZERO(&rfds_all);

689

565

690

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

691

566

while(true){

692

567

dirst = readdir(dir);

693

568

694

/* All directory entries have been processed */

569

// All directory entries have been processed

695

570

if(dirst == NULL){

696

571

if (errno == EBADF){

697

572

perror("readdir");

703

578

704

579

d_name_len = strlen(dirst->d_name);

705

580

706

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

581

// Ignore dotfiles, backup files and other junk

707

582

{

708

583

bool bad_name = false;

709

584

724

599

break;

725

600

}

726

601

}

602

727

603

if(bad_name){

728

604

continue;

729

605

}

606

730

607

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

731

608

size_t suf_len = strlen(*suf);

732

609

if((d_name_len >= suf_len)

759

636

free(filename);

760

637

continue;

761

638

}

762

763

/* Ignore non-executable files */

639

764

640

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

765

641

if(debug){

766

642

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

769

645

free(filename);

770

646

continue;

771

647

}

772

773

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

648

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

774

649

if(p == NULL){

775

650

perror("getplugin");

776

651

free(filename);

786

661

}

787

662

{

788

663

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

789

plugin *g = getplugin(NULL);

664

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

790

665

if(g != NULL){

791

666

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

792

667

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

795

670

}

796

671

/* Add global environment variables */

797

672

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

798

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

673

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

799

674

perror("add_environment");

800

675

}

801

676

}

806

681

process, too. */

807

682

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

808

683

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

809

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

684

char *copy = strdup(*e);

685

if(copy == NULL){

686

perror("strdup");

687

continue;

688

}

689

if(not add_environment(p, copy)){

810

690

perror("add_environment");

811

691

}

812

692

}

819

699

exitstatus = EXIT_FAILURE;

820

700

goto fallback;

821

701

}

822

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

823

702

ret = set_cloexec_flag(pipefd[0]);

824

703

if(ret < 0){

825

704

perror("set_cloexec_flag");

839

718

exitstatus = EXIT_FAILURE;

840

719

goto fallback;

841

720

}

842

/* Starting a new process to be watched */

721

// Starting a new process to be watched

843

722

pid_t pid = fork();

844

723

if(pid == -1){

845

724

perror("fork");

883

762

}

884

763

/* no return */

885

764

}

886

/* Parent process */

887

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

765

/* parent process */

888

766

free(filename);

889

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

890

if (new_plugin == NULL){

891

perror("getplugin");

767

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

768

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

769

if (new_process == NULL){

770

perror("malloc");

892

771

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

893

772

if(ret < 0){

894

perror("sigprocmask");

773

perror("sigprocmask");

895

774

}

896

775

exitstatus = EXIT_FAILURE;

897

776

goto fallback;

898

777

}

899

778

900

new_plugin->pid = pid;

901

new_plugin->fd = pipefd[0];

902

779

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

780

.fd = pipefd[0],

781

.next = process_list };

782

// List handling

783

process_list = new_process;

903

784

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

904

785

has already completed */

905

786

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

909

790

goto fallback;

910

791

}

911

792

912

FD_SET(new_plugin->fd, &rfds_all);

793

FD_SET(new_process->fd, &rfds_all);

913

794

914

if (maxfd < new_plugin->fd){

915

maxfd = new_plugin->fd;

795

if (maxfd < new_process->fd){

796

maxfd = new_process->fd;

916

797

}

917

798

918

799

}

919

800

801

free_plugin_list(plugin_list);

802

plugin_list = NULL;

803

920

804

closedir(dir);

921

805

dir = NULL;

922

923

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

924

if(p->pid != 0){

925

break;

926

}

927

if(p->next == NULL){

928

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

929

" directory?\n");

930

free_plugin_list();

931

}

806

807

if (process_list == NULL){

808

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

809

" directory?\n");

810

process_list = NULL;

932

811

}

933

934

/* Main loop while running plugins exist */

935

while(plugin_list){

812

while(process_list){

936

813

fd_set rfds = rfds_all;

937

814

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

938

815

if (select_ret == -1){

942

819

}

943

820

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

944

821

from one of them */

945

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

822

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

946

823

/* Is this process completely done? */

947

824

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

948

825

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

949

826

if(not WIFEXITED(proc->status)

950

827

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

951

828

/* Bad exit by plugin */

952

953

829

if(debug){

954

830

if(WIFEXITED(proc->status)){

955

831

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

964

840

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

965

841

}

966

842

}

967

968

843

/* Remove the plugin */

969

844

FD_CLR(proc->fd, &rfds_all);

970

971

845

/* Block signal while modifying process_list */

972

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

846

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

973

847

if(ret < 0){

974

848

perror("sigprocmask");

975

849

exitstatus = EXIT_FAILURE;

976

850

goto fallback;

977

851

}

978

free_plugin(proc);

852

/* Delete this process entry from the list */

853

if(process_list == proc){

854

/* First one - simple */

855

process_list = proc->next;

856

} else {

857

/* Second one or later */

858

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

859

if(p->next == proc){

860

p->next = proc->next;

861

break;

862

}

863

}

864

}

979

865

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

980

866

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

981

867

NULL);

982

868

if(ret < 0){

983

869

perror("sigprocmask");

984

exitstatus = EXIT_FAILURE;

985

goto fallback;

986

}

987

988

if(plugin_list == NULL){

989

break;

990

}

991

continue;

870

}

871

free(proc->buffer);

872

free(proc);

873

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

874

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

875

the process list */

876

break;

992

877

}

993

994

878

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

995

879

996

bool bret = print_out_password(proc->buffer,

997

proc->buffer_length);

880

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

998

881

if(not bret){

999

882

perror("print_out_password");

1000

883

exitstatus = EXIT_FAILURE;

1001

884

}

1002

885

goto fallback;

1003

886

}

1004

1005

887

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

1006

888

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

1007

889

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

1037

919

1038

920

fallback:

1039

921

1040

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

1041

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

1042

occured */

922

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

923

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

1043

924

bool bret;

1044

925

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

1045

926

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

1058

939

}

1059

940

1060

941

if(custom_argv != NULL){

1061

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

942

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

1062

943

free(*arg);

1063

944

}

1064

945

free(custom_argv);

1065

946

}

947

free_plugin_list(plugin_list);

1066

948

1067

949

if(dir != NULL){

1068

950

closedir(dir);

1069

951

}

1070

952

1071

953

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

1072

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

1073

if(p->pid != 0){

1074

close(p->fd);

1075

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

1076

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

1077

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

1078

perror("kill");

1079

}

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");

1080

961

}

962

free(process_list->buffer);

963

free(process_list);

1081

964

}

1082

965

1083

966

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

1087

970

if(errno != ECHILD){

1088

971

perror("wait");

1089

972

}

1090

1091

free_plugin_list();

1092

1093

free(plugindir);

1094

free(argfile);

1095

973

1096

974

return exitstatus;

1097

975

}