/mandos/release : revision 24.1.82

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, error_t */

59

ARGP_KEY_END, ARGP_KEY_ARG,

60

error_t */

60

61

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

61

62

sigaddset(), sigaction(),

62

63

sigprocmask(), SIG_BLOCK, SIGCHLD,

64

65

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

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66

67

#define BUFFER_SIZE 256

67

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

68

69

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

70

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

68

71

69

72

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

70

73

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

71

74

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;

75

struct plugin;

85

76

86

77

typedef struct plugin{

87

78

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

90

81

char **environ;

91

82

int envc;

92

83

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;

93

94

struct plugin *next;

94

95

} plugin;

95

96

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

97

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

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){

98

104

if ((p->name == name)

99

105

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

100

106

return p;

108

114

char *copy_name = NULL;

109

115

if(name != NULL){

110

116

copy_name = strdup(name);

111

}

112

if(copy_name == NULL){

113

return NULL;

114

}

115

117

if(copy_name == NULL){

118

return NULL;

119

}

120

}

121

116

122

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

117

123

.argc = 1,

118

.envc = 0,

119

124

.disabled = false,

120

.next = *plugin_list };

125

.next = plugin_list };

121

126

122

127

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

123

128

if (new_plugin->argv == NULL){

127

132

}

128

133

new_plugin->argv[0] = copy_name;

129

134

new_plugin->argv[1] = NULL;

130

135

131

136

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

132

137

if(new_plugin->environ == NULL){

133

138

free(copy_name);

136

141

return NULL;

137

142

}

138

143

new_plugin->environ[0] = NULL;

144

139

145

/* Append the new plugin to the list */

140

*plugin_list = new_plugin;

146

plugin_list = new_plugin;

141

147

return new_plugin;

142

148

}

143

149

173

179

}

174

180

175

181

/* Add to a plugin's environment */

176

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

182

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

177

183

if(p == NULL){

178

184

return false;

179

185

}

186

/* namelen = length of name of environment variable */

187

size_t namelen = (size_t)(strchrnul(def, '=') - def);

188

/* Search for this environment variable */

189

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

190

if(strncmp(*e, def, namelen+1) == 0){

191

/* It already exists */

192

if(replace){

193

char *new = realloc(*e, strlen(def));

194

if(new == NULL){

195

return false;

196

}

197

*e = new;

198

strcpy(*e, def);

199

}

200

return true;

201

}

202

}

180

203

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

181

204

}

182

205

183

184

206

/*

185

207

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

186

208

* Descriptor Flags".

197

219

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

198

220

}

199

221

200

process *process_list = NULL;

201

222

202

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

223

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

203

224

status. */

204

225

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

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;

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

}

221

253

}

222

254

255

/* Prints out a password to stdout */

223

256

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

224

257

ssize_t ret;

225

258

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

235

268

return true;

236

269

}

237

270

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;

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

}

244

295

}

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

}

297

298

free(plugin_node);

257

299

}

258

300

259

static void free_plugin_list(plugin *plugin_list){

260

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

261

next = plugin_list->next;

262

free(plugin_list->name);

263

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

264

free(*arg);

265

}

266

free(plugin_list->argv);

267

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

268

free(*env);

269

}

270

free(plugin_list->environ);

271

free(plugin_list);

272

}

301

static void free_plugin_list(void){

302

while(plugin_list != NULL){

303

free_plugin(plugin_list);

304

}

273

305

}

274

306

275

307

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

276

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

277

const char *argfile = ARGFILE;

308

char *plugindir = NULL;

309

char *argfile = NULL;

278

310

FILE *conffp;

279

311

size_t d_name_len;

280

312

DIR *dir = NULL;

303

335

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

304

336

if(ret == -1){

305

337

perror("sigaction");

306

exitstatus = EXIT_FAILURE;

338

exitstatus = EXIT_FAILURE;

307

339

goto fallback;

308

340

}

309

341

312

344

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

313

345

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

314

346

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

315

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

347

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

316

348

.arg = "VAR=value",

317

349

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

318

350

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

319

351

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

320

352

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

321

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

353

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

322

354

.arg = "PLUGIN:ENV=value",

323

355

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

324

356

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

325

357

.arg = "PLUGIN",

326

358

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

359

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

360

.arg = "PLUGIN",

361

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

327

362

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

328

363

.arg = "DIRECTORY",

329

364

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

330

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

331

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

332

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

333

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

334

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

335

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

336

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

337

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

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 },

338

376

{ .name = NULL }

339

377

};

340

378

341

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

342

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

343

pointer to our plugin list pointer. */

344

plugin **plugins = state->input;

379

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

380

struct argp_state *state) {

345

381

switch (key) {

346

case 'g':

382

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

347

383

if (arg != NULL){

348

384

char *p;

349

385

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

350

386

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

351

387

continue;

352

388

}

353

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

389

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

354

390

perror("add_argument");

355

391

return ARGP_ERR_UNKNOWN;

356

392

}

357

393

}

358

394

}

359

395

break;

360

case 'e':

396

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

361

397

if(arg == NULL){

362

398

break;

363

399

}

366

402

if(envdef == NULL){

367

403

break;

368

404

}

369

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

405

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

370

406

perror("add_environment");

371

407

}

372

408

}

373

409

break;

374

case 'o':

410

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

375

411

if (arg != NULL){

376

412

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

377

413

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

387

423

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

388

424

continue;

389

425

}

390

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

426

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

391

427

perror("add_argument");

392

428

return ARGP_ERR_UNKNOWN;

393

429

}

395

431

}

396

432

}

397

433

break;

398

case 'f':

434

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

399

435

if(arg == NULL){

400

436

break;

401

437

}

409

445

break;

410

446

}

411

447

envdef++;

412

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

448

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

413

449

perror("add_environment");

414

450

}

415

451

}

416

452

break;

417

case 'd':

453

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

418

454

if (arg != NULL){

419

plugin *p = getplugin(arg, plugins);

455

plugin *p = getplugin(arg);

420

456

if(p == NULL){

421

457

return ARGP_ERR_UNKNOWN;

422

458

}

423

459

p->disabled = true;

424

460

}

425

461

break;

426

case 128:

427

plugindir = arg;

428

break;

429

case 129:

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 */

430

481

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

431

482

break;

432

case 130:

483

case 131: /* --groupid */

433

484

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

434

485

break;

435

case 131:

486

case 132: /* --debug */

436

487

debug = true;

437

488

break;

438

489

case ARGP_KEY_ARG:

446

497

return 0;

447

498

}

448

499

449

plugin *plugin_list = NULL;

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

}

450

531

451

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

452

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

532

struct argp argp = { .options = options,

533

.parser = parse_opt_config_file,

534

.args_doc = "",

453

535

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

454

536

455

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

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);

456

540

if (ret == ARGP_ERR_UNKNOWN){

457

541

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

458

542

exitstatus = EXIT_FAILURE;

459

543

goto fallback;

460

544

}

461

462

conffp = fopen(argfile, "r");

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

}

463

555

if(conffp != NULL){

464

556

char *org_line = NULL;

465

557

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

468

560

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

469

561

const char comment_delim[] = "#";

470

562

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 */

471

575

while(true){

472

576

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

473

577

if(sret == -1){

481

585

continue;

482

586

}

483

587

new_arg = strdup(p);

484

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

485

if (custom_argv == NULL){

486

perror("add_to_argv");

487

exitstatus = EXIT_FAILURE;

488

goto fallback;

489

}

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;

490

606

}

491

607

}

492

608

free(org_line);

493

} else{

609

} else {

494

610

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

495

611

not affect opening plugins */

496

612

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

499

615

goto fallback;

500

616

}

501

617

}

502

618

/* If there was any arguments from configuration file,

619

pass them to parser as command arguments */

503

620

if(custom_argv != NULL){

504

custom_argv[0] = argv[0];

505

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

621

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

622

0, NULL);

506

623

if (ret == ARGP_ERR_UNKNOWN){

507

624

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

508

625

exitstatus = EXIT_FAILURE;

510

627

}

511

628

}

512

629

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

513

639

if(debug){

514

640

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

515

641

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

524

650

}

525

651

}

526

652

653

/* Strip permissions down to nobody */

527

654

ret = setuid(uid);

528

655

if (ret == -1){

529

656

perror("setuid");

530

}

531

657

}

532

658

setgid(gid);

533

659

if (ret == -1){

534

660

perror("setgid");

535

661

}

536

662

537

dir = opendir(plugindir);

663

if (plugindir == NULL){

664

dir = opendir(PDIR);

665

} else {

666

dir = opendir(plugindir);

667

}

668

538

669

if(dir == NULL){

539

670

perror("Could not open plugin dir");

540

671

exitstatus = EXIT_FAILURE;

556

687

557

688

FD_ZERO(&rfds_all);

558

689

690

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

559

691

while(true){

560

692

dirst = readdir(dir);

561

693

562

// All directory entries have been processed

694

/* All directory entries have been processed */

563

695

if(dirst == NULL){

564

696

if (errno == EBADF){

565

697

perror("readdir");

571

703

572

704

d_name_len = strlen(dirst->d_name);

573

705

574

// Ignore dotfiles, backup files and other junk

706

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

575

707

{

576

708

bool bad_name = false;

577

709

592

724

break;

593

725

}

594

726

}

595

596

727

if(bad_name){

597

728

continue;

598

729

}

599

600

730

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

601

731

size_t suf_len = strlen(*suf);

602

732

if((d_name_len >= suf_len)

629

759

free(filename);

630

760

continue;

631

761

}

632

762

763

/* Ignore non-executable files */

633

764

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

634

765

if(debug){

635

766

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

638

769

free(filename);

639

770

continue;

640

771

}

641

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

772

773

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

642

774

if(p == NULL){

643

775

perror("getplugin");

644

776

free(filename);

654

786

}

655

787

{

656

788

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

657

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

789

plugin *g = getplugin(NULL);

658

790

if(g != NULL){

659

791

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

660

792

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

663

795

}

664

796

/* Add global environment variables */

665

797

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

666

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

798

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

667

799

perror("add_environment");

668

800

}

669

801

}

674

806

process, too. */

675

807

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

676

808

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

677

char *copy = strdup(*e);

678

if(copy == NULL){

679

perror("strdup");

680

continue;

681

}

682

if(not add_environment(p, copy)){

809

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

683

810

perror("add_environment");

684

811

}

685

812

}

686

813

}

687

814

688

int pipefd[2];

815

int pipefd[2];

689

816

ret = pipe(pipefd);

690

817

if (ret == -1){

691

818

perror("pipe");

692

819

exitstatus = EXIT_FAILURE;

693

820

goto fallback;

694

821

}

822

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

695

823

ret = set_cloexec_flag(pipefd[0]);

696

824

if(ret < 0){

697

825

perror("set_cloexec_flag");

711

839

exitstatus = EXIT_FAILURE;

712

840

goto fallback;

713

841

}

714

// Starting a new process to be watched

842

/* Starting a new process to be watched */

715

843

pid_t pid = fork();

716

844

if(pid == -1){

717

845

perror("fork");

755

883

}

756

884

/* no return */

757

885

}

758

/* parent process */

886

/* Parent process */

887

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

759

888

free(filename);

760

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

761

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

762

if (new_process == NULL){

763

perror("malloc");

889

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

890

if (new_plugin == NULL){

891

perror("getplugin");

764

892

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

765

893

if(ret < 0){

766

perror("sigprocmask");

894

perror("sigprocmask");

767

895

}

768

896

exitstatus = EXIT_FAILURE;

769

897

goto fallback;

770

898

}

771

899

772

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

773

.fd = pipefd[0],

774

.next = process_list };

775

// List handling

776

process_list = new_process;

900

new_plugin->pid = pid;

901

new_plugin->fd = pipefd[0];

902

777

903

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

778

904

has already completed */

779

905

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

783

909

goto fallback;

784

910

}

785

911

786

FD_SET(new_process->fd, &rfds_all);

912

FD_SET(new_plugin->fd, &rfds_all);

787

913

788

if (maxfd < new_process->fd){

789

maxfd = new_process->fd;

914

if (maxfd < new_plugin->fd){

915

maxfd = new_plugin->fd;

790

916

}

791

917

792

918

}

793

919

794

free_plugin_list(plugin_list);

795

796

920

closedir(dir);

797

921

dir = NULL;

798

799

if (process_list == NULL){

800

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

801

" directory?\n");

802

process_list = 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

}

803

932

}

804

while(process_list){

933

934

/* Main loop while running plugins exist */

935

while(plugin_list){

805

936

fd_set rfds = rfds_all;

806

937

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

807

938

if (select_ret == -1){

811

942

}

812

943

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

813

944

from one of them */

814

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

945

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

815

946

/* Is this process completely done? */

816

947

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

817

948

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

818

949

if(not WIFEXITED(proc->status)

819

950

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

820

951

/* Bad exit by plugin */

952

821

953

if(debug){

822

954

if(WIFEXITED(proc->status)){

823

955

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

832

964

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

833

965

}

834

966

}

967

835

968

/* Remove the plugin */

836

969

FD_CLR(proc->fd, &rfds_all);

970

837

971

/* Block signal while modifying process_list */

838

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

972

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

839

973

if(ret < 0){

840

974

perror("sigprocmask");

841

975

exitstatus = EXIT_FAILURE;

842

976

goto fallback;

843

977

}

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

}

978

free_plugin(proc);

857

979

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

858

980

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

859

981

NULL);

860

982

if(ret < 0){

861

983

perror("sigprocmask");

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;

984

exitstatus = EXIT_FAILURE;

985

goto fallback;

986

}

987

988

if(plugin_list == NULL){

989

break;

990

}

991

continue;

869

992

}

993

870

994

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

871

995

872

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

996

bool bret = print_out_password(proc->buffer,

997

proc->buffer_length);

873

998

if(not bret){

874

999

perror("print_out_password");

875

1000

exitstatus = EXIT_FAILURE;

876

1001

}

877

1002

goto fallback;

878

1003

}

1004

879

1005

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

880

1006

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

881

1007

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

911

1037

912

1038

fallback:

913

1039

914

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

915

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

1040

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

1041

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

1042

occured */

916

1043

bool bret;

917

1044

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

918

1045

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

931

1058

}

932

1059

933

1060

if(custom_argv != NULL){

934

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

1061

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

935

1062

free(*arg);

936

1063

}

937

1064

free(custom_argv);

938

1065

}

939

free_plugin_list(plugin_list);

940

1066

941

1067

if(dir != NULL){

942

1068

closedir(dir);

943

1069

}

944

1070

945

1071

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

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");

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

}

953

1080

}

954

free(process_list->buffer);

955

free(process_list);

956

1081

}

957

1082

958

1083

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

962

1087

if(errno != ECHILD){

963

1088

perror("wait");

964

1089

}

1090

1091

free_plugin_list();

1092

1093

free(plugindir);

1094

free(argfile);

965

1095

966

1096

return exitstatus;

967

1097

}