/mandos/trunk : revision 24.1.53

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#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 */

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65

67

66

#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"

67

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

71

68

72

69

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

73

70

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

74

71

75

struct plugin;

72

struct process;

73

74

typedef struct process{

75

pid_t pid;

76

int fd;

77

char *buffer;

78

size_t buffer_size;

79

size_t buffer_length;

80

bool eof;

81

bool completed;

82

int status;

83

struct process *next;

84

} process;

76

85

77

86

typedef struct plugin{

78

87

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

81

90

char **environ;

82

91

int envc;

83

92

bool disabled;

84

85

/* Variables used for running processes*/

86

pid_t pid;

87

int fd;

88

char *buffer;

89

size_t buffer_size;

90

size_t buffer_length;

91

bool eof;

92

volatile bool completed;

93

volatile int status;

94

93

struct plugin *next;

95

94

} plugin;

96

95

97

static plugin *plugin_list = NULL;

98

99

/* Gets a existing plugin based on name,

100

or if none is found, creates a new one */

101

static plugin *getplugin(char *name){

102

/* Check for exiting plugin with that name */

103

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

96

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

97

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

104

98

if ((p->name == name)

105

99

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

106

100

return p;

111

105

if (new_plugin == NULL){

112

106

return NULL;

113

107

}

114

char *copy_name = NULL;

115

if(name != NULL){

116

copy_name = strdup(name);

117

if(copy_name == NULL){

118

return NULL;

119

}

120

}

121

122

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

108

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

123

109

.argc = 1,

110

.envc = 0,

124

111

.disabled = false,

125

.next = plugin_list };

112

.next = *plugin_list };

126

113

127

114

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

128

115

if (new_plugin->argv == NULL){

129

free(copy_name);

130

116

free(new_plugin);

131

117

return NULL;

132

118

}

133

new_plugin->argv[0] = copy_name;

119

new_plugin->argv[0] = name;

134

120

new_plugin->argv[1] = NULL;

135

121

136

122

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

137

123

if(new_plugin->environ == NULL){

138

free(copy_name);

139

124

free(new_plugin->argv);

140

125

free(new_plugin);

141

126

return NULL;

142

127

}

143

128

new_plugin->environ[0] = NULL;

144

145

129

/* Append the new plugin to the list */

146

plugin_list = new_plugin;

130

*plugin_list = new_plugin;

147

131

return new_plugin;

148

132

}

149

133

179

163

}

180

164

181

165

/* Add to a plugin's environment */

182

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

166

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

183

167

if(p == NULL){

184

168

return false;

185

169

}

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

}

203

170

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

204

171

}

205

172

173

206

174

/*

207

175

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

208

176

* Descriptor Flags".

219

187

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

220

188

}

221

189

190

process *process_list = NULL;

222

191

223

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

192

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

224

193

status. */

225

194

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

}

195

process *proc = process_list;

196

int status;

197

pid_t pid = wait(&status);

198

if(pid == -1){

199

perror("wait");

200

return;

201

}

202

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

203

proc = proc->next;

204

}

205

if(proc == NULL){

206

/* Process not found in process list */

207

return;

208

}

209

proc->status = status;

210

proc->completed = true;

253

211

}

254

212

255

/* Prints out a password to stdout */

256

213

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

257

214

ssize_t ret;

258

215

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

268

225

return true;

269

226

}

270

227

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

}

228

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

229

if (argv == NULL){

230

*argc = 1;

231

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

232

if(argv == NULL){

233

return NULL;

295

234

}

296

}

297

298

free(plugin_node);

299

}

300

301

static void free_plugin_list(void){

302

while(plugin_list != NULL){

303

free_plugin(plugin_list);

304

}

235

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

236

argv[1] = NULL;

237

}

238

*argc += 1;

239

argv = realloc(argv, sizeof(char *)

240

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

241

if(argv == NULL){

242

return NULL;

243

}

244

argv[*argc-1] = arg;

245

argv[*argc] = NULL;

246

return argv;

305

247

}

306

248

307

249

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

308

char *plugindir = NULL;

309

char *argfile = NULL;

250

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

251

const char *argfile = ARGFILE;

310

252

FILE *conffp;

311

253

size_t d_name_len;

312

254

DIR *dir = NULL;

327

269

/* Establish a signal handler */

328

270

sigemptyset(&sigchld_action.sa_mask);

329

271

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

330

if(ret == -1){

272

if(ret < 0){

331

273

perror("sigaddset");

332

exitstatus = EXIT_FAILURE;

333

goto fallback;

274

exit(EXIT_FAILURE);

334

275

}

335

276

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

336

if(ret == -1){

277

if(ret < 0){

337

278

perror("sigaction");

338

exitstatus = EXIT_FAILURE;

339

goto fallback;

279

exit(EXIT_FAILURE);

340

280

}

341

281

342

282

/* The options we understand. */

344

284

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

345

285

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

346

286

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

347

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

287

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

348

288

.arg = "VAR=value",

349

289

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

350

290

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

351

291

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

352

292

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

353

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

293

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

354

294

.arg = "PLUGIN:ENV=value",

355

295

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

356

296

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

359

299

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

360

300

.arg = "DIRECTORY",

361

301

.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 },

302

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

303

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

304

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

305

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

306

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

307

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

308

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

309

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

373

310

{ .name = NULL }

374

311

};

375

312

376

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

377

struct argp_state *state) {

313

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

314

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

315

pointer to our plugin list pointer. */

316

plugin **plugins = state->input;

378

317

switch (key) {

379

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

318

case 'g':

380

319

if (arg != NULL){

381

320

char *p;

382

321

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

383

322

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

384

323

continue;

385

324

}

386

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

325

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

387

326

perror("add_argument");

388

327

return ARGP_ERR_UNKNOWN;

389

328

}

390

329

}

391

330

}

392

331

break;

393

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

332

case 'e':

394

333

if(arg == NULL){

395

334

break;

396

335

}

399

338

if(envdef == NULL){

400

339

break;

401

340

}

402

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

341

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

403

342

perror("add_environment");

404

343

}

405

344

}

406

345

break;

407

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

346

case 'o':

408

347

if (arg != NULL){

409

348

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

410

349

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

420

359

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

421

360

continue;

422

361

}

423

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

362

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

424

363

perror("add_argument");

425

364

return ARGP_ERR_UNKNOWN;

426

365

}

428

367

}

429

368

}

430

369

break;

431

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

370

case 'f':

432

371

if(arg == NULL){

433

372

break;

434

373

}

442

381

break;

443

382

}

444

383

envdef++;

445

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

384

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

446

385

perror("add_environment");

447

386

}

448

387

}

449

388

break;

450

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

389

case 'd':

451

390

if (arg != NULL){

452

plugin *p = getplugin(arg);

391

plugin *p = getplugin(arg, plugins);

453

392

if(p == NULL){

454

393

return ARGP_ERR_UNKNOWN;

455

394

}

456

395

p->disabled = true;

457

396

}

458

397

break;

459

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

460

plugindir = strdup(arg);

461

if(plugindir == NULL){

462

perror("strdup");

463

}

464

break;

465

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

466

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

467

break;

468

case 130: /* --userid */

398

case 128:

399

plugindir = arg;

400

break;

401

case 129:

469

402

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

470

403

break;

471

case 131: /* --groupid */

404

case 130:

472

405

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

473

406

break;

474

case 132: /* --debug */

407

case 131:

475

408

debug = true;

476

409

break;

477

410

case ARGP_KEY_ARG:

485

418

return 0;

486

419

}

487

420

488

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

489

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

490

error_t parse_opt_config_file (int key, char *arg,

491

__attribute__((unused))

492

struct argp_state *state) {

493

switch (key) {

494

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

495

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

496

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

497

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

498

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

499

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

500

break;

501

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

502

argfile = strdup(arg);

503

if(argfile == NULL){

504

perror("strdup");

505

}

506

break;

507

case 130: /* --userid */

508

case 131: /* --groupid */

509

case 132: /* --debug */

510

case ARGP_KEY_ARG:

511

case ARGP_KEY_END:

512

break;

513

default:

514

return ARGP_ERR_UNKNOWN;

515

}

516

return 0;

517

}

421

plugin *plugin_list = NULL;

518

422

519

struct argp argp = { .options = options,

520

.parser = parse_opt_config_file,

521

.args_doc = "",

423

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

424

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

522

425

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

523

426

524

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

525

config file location, if any. */

526

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

427

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

527

428

if (ret == ARGP_ERR_UNKNOWN){

528

429

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

529

430

exitstatus = EXIT_FAILURE;

530

goto fallback;

431

goto end;

531

432

}

532

533

/* Reset to the normal argument parser */

534

argp.parser = parse_opt;

535

536

/* Open the configfile if available */

537

if (argfile == NULL){

538

conffp = fopen(AFILE, "r");

539

} else {

540

conffp = fopen(argfile, "r");

541

}

433

434

conffp = fopen(argfile, "r");

542

435

if(conffp != NULL){

543

436

char *org_line = NULL;

544

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

545

437

size_t size = 0;

546

438

ssize_t sret;

439

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

547

440

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

548

441

const char comment_delim[] = "#";

549

442

550

custom_argc = 1;

551

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

552

if(custom_argv == NULL){

553

perror("malloc");

554

exitstatus = EXIT_FAILURE;

555

goto fallback;

556

}

557

custom_argv[0] = argv[0];

558

custom_argv[1] = NULL;

559

560

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

561

commented text */

562

443

while(true){

563

444

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

564

445

if(sret == -1){

572

453

continue;

573

454

}

574

455

new_arg = strdup(p);

575

if(new_arg == NULL){

576

perror("strdup");

577

exitstatus = EXIT_FAILURE;

578

free(org_line);

579

goto fallback;

580

}

581

582

custom_argc += 1;

583

custom_argv = realloc(custom_argv, sizeof(char *)

584

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

585

if(custom_argv == NULL){

586

perror("realloc");

587

exitstatus = EXIT_FAILURE;

588

free(org_line);

589

goto fallback;

590

}

591

custom_argv[custom_argc-1] = new_arg;

592

custom_argv[custom_argc] = NULL;

456

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

457

if (custom_argv == NULL){

458

perror("add_to_argv");

459

exitstatus = EXIT_FAILURE;

460

goto end;

461

}

593

462

}

594

463

}

595

464

free(org_line);

596

} else {

465

} else{

597

466

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

598

467

not affect opening plugins */

599

468

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

600

469

perror("fopen");

601

470

exitstatus = EXIT_FAILURE;

602

goto fallback;

471

goto end;

603

472

}

604

473

}

605

/* If there was any arguments from configuration file,

606

pass them to parser as command arguments */

474

607

475

if(custom_argv != NULL){

608

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

609

0, NULL);

476

custom_argv[0] = argv[0];

477

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

610

478

if (ret == ARGP_ERR_UNKNOWN){

611

479

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

612

480

exitstatus = EXIT_FAILURE;

613

goto fallback;

481

goto end;

614

482

}

615

483

}

616

484

617

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

618

config file */

619

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

620

if (ret == ARGP_ERR_UNKNOWN){

621

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

622

exitstatus = EXIT_FAILURE;

623

goto fallback;

624

}

625

626

485

if(debug){

627

486

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

628

487

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

637

496

}

638

497

}

639

498

640

/* Strip permissions down to nobody */

641

499

ret = setuid(uid);

642

500

if (ret == -1){

643

501

perror("setuid");

644

}

502

}

503

645

504

setgid(gid);

646

505

if (ret == -1){

647

506

perror("setgid");

648

507

}

649

508

650

if (plugindir == NULL){

651

dir = opendir(PDIR);

652

} else {

653

dir = opendir(plugindir);

654

}

655

509

dir = opendir(plugindir);

656

510

if(dir == NULL){

657

511

perror("Could not open plugin dir");

658

512

exitstatus = EXIT_FAILURE;

659

goto fallback;

513

goto end;

660

514

}

661

515

662

516

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

667

521

if(ret < 0){

668

522

perror("set_cloexec_flag");

669

523

exitstatus = EXIT_FAILURE;

670

goto fallback;

524

goto end;

671

525

}

672

526

}

673

527

}

674

528

675

529

FD_ZERO(&rfds_all);

676

530

677

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

678

531

while(true){

679

532

dirst = readdir(dir);

680

533

681

/* All directory entries have been processed */

534

// All directory entries have been processed

682

535

if(dirst == NULL){

683

536

if (errno == EBADF){

684

537

perror("readdir");

685

538

exitstatus = EXIT_FAILURE;

686

goto fallback;

539

goto end;

687

540

}

688

541

break;

689

542

}

690

543

691

544

d_name_len = strlen(dirst->d_name);

692

545

693

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

546

// Ignore dotfiles, backup files and other junk

694

547

{

695

548

bool bad_name = false;

696

549

711

564

break;

712

565

}

713

566

}

567

714

568

if(bad_name){

715

569

continue;

716

570

}

571

717

572

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

718

573

size_t suf_len = strlen(*suf);

719

574

if((d_name_len >= suf_len)

746

601

free(filename);

747

602

continue;

748

603

}

749

750

/* Ignore non-executable files */

604

751

605

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

752

606

if(debug){

753

607

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

756

610

free(filename);

757

611

continue;

758

612

}

759

760

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

613

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

761

614

if(p == NULL){

762

615

perror("getplugin");

763

616

free(filename);

773

626

}

774

627

{

775

628

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

776

plugin *g = getplugin(NULL);

629

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

777

630

if(g != NULL){

778

631

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

779

632

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

782

635

}

783

636

/* Add global environment variables */

784

637

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

785

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

638

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

786

639

perror("add_environment");

787

640

}

788

641

}

793

646

process, too. */

794

647

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

795

648

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

796

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

649

char *copy = strdup(*e);

650

if(copy == NULL){

651

perror("strdup");

652

continue;

653

}

654

if(not add_environment(p, copy)){

797

655

perror("add_environment");

798

656

}

799

657

}

800

658

}

801

659

802

int pipefd[2];

660

int pipefd[2];

803

661

ret = pipe(pipefd);

804

662

if (ret == -1){

805

663

perror("pipe");

806

664

exitstatus = EXIT_FAILURE;

807

goto fallback;

665

goto end;

808

666

}

809

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

810

667

ret = set_cloexec_flag(pipefd[0]);

811

668

if(ret < 0){

812

669

perror("set_cloexec_flag");

813

670

exitstatus = EXIT_FAILURE;

814

goto fallback;

671

goto end;

815

672

}

816

673

ret = set_cloexec_flag(pipefd[1]);

817

674

if(ret < 0){

818

675

perror("set_cloexec_flag");

819

676

exitstatus = EXIT_FAILURE;

820

goto fallback;

677

goto end;

821

678

}

822

679

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

823

680

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

824

681

if(ret < 0){

825

682

perror("sigprocmask");

826

683

exitstatus = EXIT_FAILURE;

827

goto fallback;

684

goto end;

828

685

}

829

/* Starting a new process to be watched */

686

// Starting a new process to be watched

830

687

pid_t pid = fork();

831

688

if(pid == -1){

832

689

perror("fork");

833

690

exitstatus = EXIT_FAILURE;

834

goto fallback;

691

goto end;

835

692

}

836

693

if(pid == 0){

837

694

/* this is the child process */

870

727

}

871

728

/* no return */

872

729

}

873

/* Parent process */

874

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

730

/* parent process */

875

731

free(filename);

876

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

877

if (new_plugin == NULL){

878

perror("getplugin");

732

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

733

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

734

if (new_process == NULL){

735

perror("malloc");

879

736

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

880

737

if(ret < 0){

881

perror("sigprocmask");

738

perror("sigprocmask");

882

739

}

883

740

exitstatus = EXIT_FAILURE;

884

goto fallback;

741

goto end;

885

742

}

886

743

887

new_plugin->pid = pid;

888

new_plugin->fd = pipefd[0];

889

744

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

745

.fd = pipefd[0],

746

.next = process_list };

747

// List handling

748

process_list = new_process;

890

749

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

891

750

has already completed */

892

751

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

893

752

if(ret < 0){

894

753

perror("sigprocmask");

895

754

exitstatus = EXIT_FAILURE;

896

goto fallback;

897

}

898

899

FD_SET(new_plugin->fd, &rfds_all);

900

901

if (maxfd < new_plugin->fd){

902

maxfd = new_plugin->fd;

903

}

904

755

goto end;

756

}

757

758

FD_SET(new_process->fd, &rfds_all);

759

760

if (maxfd < new_process->fd){

761

maxfd = new_process->fd;

762

}

763

764

}

765

766

/* Free the plugin list */

767

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

768

next = plugin_list->next;

769

free(plugin_list->argv);

770

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

771

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

772

free(*e);

773

}

774

}

775

free(plugin_list);

905

776

}

906

777

907

778

closedir(dir);

908

779

dir = NULL;

909

910

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

911

if(p->pid != 0){

912

break;

913

}

914

if(p->next == NULL){

915

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

916

" directory?\n");

917

free_plugin_list();

918

}

780

781

if (process_list == NULL){

782

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

783

" directory?\n");

784

process_list = NULL;

919

785

}

920

921

/* Main loop while running plugins exist */

922

while(plugin_list){

786

while(process_list){

923

787

fd_set rfds = rfds_all;

924

788

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

925

789

if (select_ret == -1){

926

790

perror("select");

927

791

exitstatus = EXIT_FAILURE;

928

goto fallback;

792

goto end;

929

793

}

930

794

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

931

795

from one of them */

932

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

796

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

933

797

/* Is this process completely done? */

934

798

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

935

799

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

936

800

if(not WIFEXITED(proc->status)

937

801

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

938

802

/* Bad exit by plugin */

939

940

803

if(debug){

941

804

if(WIFEXITED(proc->status)){

942

805

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

951

814

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

952

815

}

953

816

}

954

955

817

/* Remove the plugin */

956

818

FD_CLR(proc->fd, &rfds_all);

957

958

819

/* Block signal while modifying process_list */

959

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

820

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

960

821

if(ret < 0){

961

822

perror("sigprocmask");

962

823

exitstatus = EXIT_FAILURE;

963

goto fallback;

964

}

965

free_plugin(proc);

824

goto end;

825

}

826

/* Delete this process entry from the list */

827

if(process_list == proc){

828

/* First one - simple */

829

process_list = proc->next;

830

} else {

831

/* Second one or later */

832

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

833

if(p->next == proc){

834

p->next = proc->next;

835

break;

836

}

837

}

838

}

966

839

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

967

840

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

968

841

NULL);

969

842

if(ret < 0){

970

843

perror("sigprocmask");

971

exitstatus = EXIT_FAILURE;

972

goto fallback;

973

}

974

975

if(plugin_list == NULL){

976

break;

977

}

978

continue;

844

}

845

free(proc->buffer);

846

free(proc);

847

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

848

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

849

the process list */

850

break;

979

851

}

980

981

852

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

982

853

983

bool bret = print_out_password(proc->buffer,

984

proc->buffer_length);

854

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

985

855

if(not bret){

986

856

perror("print_out_password");

987

857

exitstatus = EXIT_FAILURE;

988

858

}

989

goto fallback;

859

goto end;

990

860

}

991

992

861

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

993

862

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

994

863

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

1001

870

if (proc->buffer == NULL){

1002

871

perror("malloc");

1003

872

exitstatus = EXIT_FAILURE;

1004

goto fallback;

873

goto end;

1005

874

}

1006

875

proc->buffer_size += BUFFER_SIZE;

1007

876

}

1022

891

}

1023

892

1024

893

1025

fallback:

894

end:

1026

895

1027

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

1028

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

1029

occured */

896

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

897

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

1030

898

bool bret;

1031

899

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

1032

900

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

1034

902

if(not bret){

1035

903

perror("print_out_password");

1036

904

exitstatus = EXIT_FAILURE;

905

goto end;

1037

906

}

1038

907

}

1039

908

1040

909

/* Restore old signal handler */

1041

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

1042

if(ret == -1){

1043

perror("sigaction");

1044

exitstatus = EXIT_FAILURE;

1045

}

1046

1047

if(custom_argv != NULL){

1048

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

1049

free(*arg);

910

sigaction(SIGCHLD, &old_sigchld_action, NULL);

911

912

free(custom_argv);

913

914

/* Free the plugin list */

915

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

916

next = plugin_list->next;

917

free(plugin_list->argv);

918

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

919

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

920

free(*e);

921

}

1050

922

}

1051

free(custom_argv);

923

free(plugin_list->environ);

924

free(plugin_list);

1052

925

}

1053

926

1054

927

if(dir != NULL){

1056

929

}

1057

930

1058

931

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

1059

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

1060

if(p->pid != 0){

1061

close(p->fd);

1062

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

1063

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

1064

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

1065

perror("kill");

1066

}

932

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

933

next = process_list->next;

934

close(process_list->fd);

935

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

936

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

937

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

938

perror("kill");

1067

939

}

940

free(process_list->buffer);

941

free(process_list);

1068

942

}

1069

943

1070

944

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

1074

948

if(errno != ECHILD){

1075

949

perror("wait");

1076

950

}

1077

1078

free_plugin_list();

1079

1080

free(plugindir);

1081

free(argfile);

1082

951

1083

952

return exitstatus;

1084

953

}