/mandos/release : revision 24.1.61

21

* Contact the authors at <mandos@fukt.bsnet.se>.

22

*/

23

24

#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */

25

26

#include <stdio.h> /* popen(), fileno(), fprintf(),

27

stderr, STDOUT_FILENO */

24

#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),

25

asprintf() */

26

#include <stddef.h> /* size_t, NULL */

27

#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,

28

EXIT_SUCCESS, realloc() */

29

#include <stdbool.h> /* bool, true, false */

30

#include <stdio.h> /* perror, popen(), fileno(),

31

fprintf(), stderr, STDOUT_FILENO */

32

#include <sys/types.h> /* DIR, opendir(), stat(), struct

33

stat, waitpid(), WIFEXITED(),

34

WEXITSTATUS(), wait(), pid_t,

35

uid_t, gid_t, getuid(), getgid(),

36

dirfd() */

37

#include <sys/select.h> /* fd_set, select(), FD_ZERO(),

38

FD_SET(), FD_ISSET(), FD_CLR */

39

#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),

40

WEXITSTATUS() */

41

#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */

28

42

#include <iso646.h> /* and, or, not */

29

#include <sys/types.h> /* DIR, opendir(), stat(),

30

struct stat, waitpid(),

31

WIFEXITED(), WEXITSTATUS(),

32

wait() */

33

#include <sys/wait.h> /* wait() */

34

43

#include <dirent.h> /* DIR, struct dirent, opendir(),

35

readdir(), closedir() */

36

#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */

44

readdir(), closedir(), dirfd() */

37

45

#include <unistd.h> /* struct stat, stat(), S_ISREG(),

38

fcntl() */

39

#include <fcntl.h> /* fcntl() */

40

#include <stddef.h> /* NULL */

41

#include <stdlib.h> /* EXIT_FAILURE */

42

#include <sys/select.h> /* fd_set, select(), FD_ZERO(),

43

FD_SET(), FD_ISSET() */

44

#include <string.h> /* strlen(), strcpy(), strcat() */

45

#include <stdbool.h> /* true */

46

#include <sys/wait.h> /* waitpid(), WIFEXITED(),

47

WEXITSTATUS() */

46

fcntl(), setuid(), setgid(),

47

F_GETFD, F_SETFD, FD_CLOEXEC,

48

access(), pipe(), fork(), close()

49

dup2, STDOUT_FILENO, _exit(),

50

execv(), write(), read(),

51

close() */

52

#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,

53

FD_CLOEXEC */

54

#include <string.h> /* strsep, strlen(), asprintf() */

48

55

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

49

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

50

struct argp_state, struct argp,

51

argp_parse() */

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 */

60

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

61

sigaddset(), sigaction(),

62

sigprocmask(), SIG_BLOCK, SIGCHLD,

63

SIG_UNBLOCK, kill() */

64

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

52

65

53

66

#define BUFFER_SIZE 256

67

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

68

69

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

70

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

54

71

55

72

struct process;

56

73

70

87

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

71

88

char **argv;

72

89

int argc;

90

char **environ;

91

int envc;

73

92

bool disabled;

74

93

struct plugin *next;

75

94

} plugin;

84

103

/* Create a new plugin */

85

104

plugin *new_plugin = malloc(sizeof(plugin));

86

105

if (new_plugin == NULL){

87

perror("malloc");

88

exit(EXIT_FAILURE);

89

}

90

new_plugin->name = name;

106

return NULL;

107

}

108

char *copy_name = strdup(name);

109

if(copy_name == NULL){

110

return NULL;

111

}

112

113

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

114

.argc = 1,

115

.envc = 0,

116

.disabled = false,

117

.next = *plugin_list };

118

91

119

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

92

120

if (new_plugin->argv == NULL){

93

perror("malloc");

94

exit(EXIT_FAILURE);

121

free(new_plugin);

122

return NULL;

95

123

}

96

new_plugin->argv[0] = name;

124

new_plugin->argv[0] = copy_name;

97

125

new_plugin->argv[1] = NULL;

98

new_plugin->argc = 1;

99

new_plugin->disabled = false;

100

new_plugin->next = *plugin_list;

126

127

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

128

if(new_plugin->environ == NULL){

129

free(new_plugin->argv);

130

free(new_plugin);

131

return NULL;

132

}

133

new_plugin->environ[0] = NULL;

101

134

/* Append the new plugin to the list */

102

135

*plugin_list = new_plugin;

103

136

return new_plugin;

104

137

}

105

138

106

static void addargument(plugin *p, char *arg){

107

p->argv[p->argc] = arg;

108

p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));

109

if (p->argv == NULL){

110

perror("malloc");

111

exit(EXIT_FAILURE);

112

}

113

p->argc++;

114

p->argv[p->argc] = NULL;

115

}

139

/* Helper function for add_argument and add_environment */

140

static bool add_to_char_array(const char *new, char ***array,

141

int *len){

142

/* Resize the pointed-to array to hold one more pointer */

143

*array = realloc(*array, sizeof(char *)

144

* (size_t) ((*len) + 2));

145

/* Malloc check */

146

if(*array == NULL){

147

return false;

148

}

149

/* Make a copy of the new string */

150

char *copy = strdup(new);

151

if(copy == NULL){

152

return false;

153

}

154

/* Insert the copy */

155

(*array)[*len] = copy;

156

(*len)++;

157

/* Add a new terminating NULL pointer to the last element */

158

(*array)[*len] = NULL;

159

return true;

160

}

161

162

/* Add to a plugin's argument vector */

163

static bool add_argument(plugin *p, const char *arg){

164

if(p == NULL){

165

return false;

166

}

167

return add_to_char_array(arg, &(p->argv), &(p->argc));

168

}

169

170

/* Add to a plugin's environment */

171

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

172

if(p == NULL){

173

return false;

174

}

175

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

176

}

177

116

178

117

179

/*

118

180

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

130

192

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

131

193

}

132

194

133

const char *argp_program_version = "plugbasedclient 0.9";

134

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

135

136

195

process *process_list = NULL;

137

196

138

197

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

141

200

process *proc = process_list;

142

201

int status;

143

202

pid_t pid = wait(&status);

203

if(pid == -1){

204

perror("wait");

205

return;

206

}

144

207

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

145

proc = proc->next;

208

proc = proc->next;

146

209

}

147

210

if(proc == NULL){

148

211

/* Process not found in process list */

152

215

proc->completed = true;

153

216

}

154

217

218

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

219

ssize_t ret;

220

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

221

length--;

222

}

223

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

224

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

225

length - written));

226

if(ret < 0){

227

return false;

228

}

229

}

230

return true;

231

}

232

233

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

234

if (argv == NULL){

235

*argc = 1;

236

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

237

if(argv == NULL){

238

return NULL;

239

}

240

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

241

argv[1] = NULL;

242

}

243

*argc += 1;

244

argv = realloc(argv, sizeof(char *)

245

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

246

if(argv == NULL){

247

return NULL;

248

}

249

argv[*argc-1] = arg;

250

argv[*argc] = NULL;

251

return argv;

252

}

253

254

static void free_plugin_list(plugin *plugin_list){

255

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

256

next = plugin_list->next;

257

free(plugin_list->name);

258

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

259

free(*arg);

260

}

261

free(plugin_list->argv);

262

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

263

free(*env);

264

}

265

free(plugin_list->environ);

266

free(plugin_list);

267

}

268

}

269

155

270

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

156

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

271

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

272

const char *argfile = ARGFILE;

273

FILE *conffp;

157

274

size_t d_name_len;

158

275

DIR *dir = NULL;

159

276

struct dirent *dirst;

160

277

struct stat st;

161

278

fd_set rfds_all;

162

279

int ret, maxfd = 0;

280

uid_t uid = 65534;

281

gid_t gid = 65534;

163

282

bool debug = false;

164

283

int exitstatus = EXIT_SUCCESS;

284

struct sigaction old_sigchld_action;

285

struct sigaction sigchld_action = { .sa_handler = handle_sigchld,

286

.sa_flags = SA_NOCLDSTOP };

287

char **custom_argv = NULL;

288

int custom_argc = 0;

165

289

166

290

/* Establish a signal handler */

167

struct sigaction old_sigchld_action,

168

sigchld_action = { .sa_handler = handle_sigchld,

169

.sa_flags = SA_NOCLDSTOP };

170

291

sigemptyset(&sigchld_action.sa_mask);

171

292

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

172

if(ret < 0){

293

if(ret == -1){

173

294

perror("sigaddset");

174

exit(EXIT_FAILURE);

295

exitstatus = EXIT_FAILURE;

296

goto fallback;

175

297

}

176

298

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

177

if(ret < 0){

299

if(ret == -1){

178

300

perror("sigaction");

179

exit(EXIT_FAILURE);

301

exitstatus = EXIT_FAILURE;

302

goto fallback;

180

303

}

181

304

182

305

/* The options we understand. */

184

307

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

185

308

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

186

309

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

310

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

311

.arg = "VAR=value",

312

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

187

313

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

188

314

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

189

315

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

316

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

317

.arg = "PLUGIN:ENV=value",

318

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

190

319

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

191

320

.arg = "PLUGIN",

192

321

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

193

322

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

194

323

.arg = "DIRECTORY",

195

324

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

196

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

325

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

326

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

327

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

328

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

329

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

330

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

331

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

197

332

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

198

333

{ .name = NULL }

199

334

};

205

340

switch (key) {

206

341

case 'g':

207

342

if (arg != NULL){

208

char *p = strtok(arg, ",");

209

do{

210

addargument(getplugin(NULL, plugins), p);

211

p = strtok(NULL, ",");

212

} while (p);

343

char *p;

344

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

345

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

346

continue;

347

}

348

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

349

perror("add_argument");

350

return ARGP_ERR_UNKNOWN;

351

}

352

}

353

}

354

break;

355

case 'e':

356

if(arg == NULL){

357

break;

358

}

359

{

360

char *envdef = strdup(arg);

361

if(envdef == NULL){

362

break;

363

}

364

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

365

perror("add_environment");

366

}

213

367

}

214

368

break;

215

369

case 'o':

216

370

if (arg != NULL){

217

char *name = strtok(arg, ":");

218

char *p = strtok(NULL, ":");

219

if(p){

220

p = strtok(p, ",");

221

do{

222

addargument(getplugin(name, plugins), p);

223

p = strtok(NULL, ",");

224

} while (p);

371

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

372

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

373

break;

374

}

375

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

376

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

377

break;

378

}

379

if(opt != NULL){

380

char *p;

381

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

382

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

383

continue;

384

}

385

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

386

perror("add_argument");

387

return ARGP_ERR_UNKNOWN;

388

}

389

}

390

}

391

}

392

break;

393

case 'f':

394

if(arg == NULL){

395

break;

396

}

397

{

398

char *envdef = strchr(arg, ':');

399

if(envdef == NULL){

400

break;

401

}

402

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

403

if(p_name == NULL){

404

break;

405

}

406

envdef++;

407

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

408

perror("add_environment");

225

409

}

226

410

}

227

411

break;

228

412

case 'd':

229

413

if (arg != NULL){

230

getplugin(arg, plugins)->disabled = true;

414

plugin *p = getplugin(arg, plugins);

415

if(p == NULL){

416

return ARGP_ERR_UNKNOWN;

417

}

418

p->disabled = true;

231

419

}

232

420

break;

233

421

case 128:

234

422

plugindir = arg;

235

423

break;

236

424

case 129:

425

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

426

break;

427

case 130:

428

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

429

break;

430

case 131:

237

431

debug = true;

238

432

break;

239

433

case ARGP_KEY_ARG:

240

argp_usage (state);

434

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

241

435

break;

242

436

case ARGP_KEY_END:

243

437

break;

250

444

plugin *plugin_list = NULL;

251

445

252

446

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

253

.args_doc = "",

447

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

254

448

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

255

449

256

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

450

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

451

if (ret == ARGP_ERR_UNKNOWN){

452

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

453

exitstatus = EXIT_FAILURE;

454

goto fallback;

455

}

456

457

conffp = fopen(argfile, "r");

458

if(conffp != NULL){

459

char *org_line = NULL;

460

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

461

size_t size = 0;

462

ssize_t sret;

463

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

464

const char comment_delim[] = "#";

465

466

while(true){

467

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

468

if(sret == -1){

469

break;

470

}

471

472

line = org_line;

473

arg = strsep(&line, comment_delim);

474

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

475

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

476

continue;

477

}

478

new_arg = strdup(p);

479

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

480

if (custom_argv == NULL){

481

perror("add_to_argv");

482

exitstatus = EXIT_FAILURE;

483

goto fallback;

484

}

485

}

486

}

487

free(org_line);

488

} else{

489

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

490

not affect opening plugins */

491

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

492

perror("fopen");

493

exitstatus = EXIT_FAILURE;

494

goto fallback;

495

}

496

}

497

498

if(custom_argv != NULL){

499

custom_argv[0] = argv[0];

500

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

501

if (ret == ARGP_ERR_UNKNOWN){

502

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

503

exitstatus = EXIT_FAILURE;

504

goto fallback;

505

}

506

}

257

507

258

508

if(debug){

259

509

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

262

512

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

263

513

fprintf(stderr, "\tArg: %s\n", *a);

264

514

}

515

fprintf(stderr, "...and %u environment variables\n", p->envc);

516

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

517

fprintf(stderr, "\t%s\n", *a);

518

}

265

519

}

266

520

}

267

521

522

ret = setuid(uid);

523

if (ret == -1){

524

perror("setuid");

525

}

526

527

setgid(gid);

528

if (ret == -1){

529

perror("setgid");

530

}

531

268

532

dir = opendir(plugindir);

269

533

if(dir == NULL){

270

534

perror("Could not open plugin dir");

271

535

exitstatus = EXIT_FAILURE;

272

goto end;

536

goto fallback;

273

537

}

274

538

275

539

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

280

544

if(ret < 0){

281

545

perror("set_cloexec_flag");

282

546

exitstatus = EXIT_FAILURE;

283

goto end;

547

goto fallback;

284

548

}

285

549

}

286

550

}

292

556

293

557

// All directory entries have been processed

294

558

if(dirst == NULL){

559

if (errno == EBADF){

560

perror("readdir");

561

exitstatus = EXIT_FAILURE;

562

goto fallback;

563

}

295

564

break;

296

565

}

297

566

341

610

continue;

342

611

}

343

612

}

344

345

char *filename = malloc(d_name_len + strlen(plugindir) + 2);

346

if (filename == NULL){

347

perror("malloc");

348

exitstatus = EXIT_FAILURE;

349

goto end;

350

}

351

strcpy(filename, plugindir); /* Spurious warning */

352

strcat(filename, "/"); /* Spurious warning */

353

strcat(filename, dirst->d_name); /* Spurious warning */

354

355

stat(filename, &st);

613

614

char *filename;

615

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

616

if(ret < 0){

617

perror("asprintf");

618

continue;

619

}

620

621

ret = stat(filename, &st);

622

if (ret == -1){

623

perror("stat");

624

free(filename);

625

continue;

626

}

356

627

357

628

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

358

629

if(debug){

362

633

free(filename);

363

634

continue;

364

635

}

365

if(getplugin(dirst->d_name, &plugin_list)->disabled){

636

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

637

if(p == NULL){

638

perror("getplugin");

639

free(filename);

640

continue;

641

}

642

if(p->disabled){

366

643

if(debug){

367

644

fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",

368

645

dirst->d_name);

370

647

free(filename);

371

648

continue;

372

649

}

373

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

374

650

{

375

651

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

376

652

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

377

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

378

addargument(p, *a);

379

}

380

}

653

if(g != NULL){

654

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

655

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

656

perror("add_argument");

657

}

658

}

659

/* Add global environment variables */

660

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

661

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

662

perror("add_environment");

663

}

664

}

665

}

666

}

667

/* If this plugin has any environment variables, we will call

668

using execve and need to duplicate the environment from this

669

process, too. */

670

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

671

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

672

char *copy = strdup(*e);

673

if(copy == NULL){

674

perror("strdup");

675

continue;

676

}

677

if(not add_environment(p, copy)){

678

perror("add_environment");

679

}

680

}

681

}

682

381

683

int pipefd[2];

382

684

ret = pipe(pipefd);

383

685

if (ret == -1){

384

686

perror("pipe");

385

687

exitstatus = EXIT_FAILURE;

386

goto end;

688

goto fallback;

387

689

}

388

690

ret = set_cloexec_flag(pipefd[0]);

389

691

if(ret < 0){

390

692

perror("set_cloexec_flag");

391

693

exitstatus = EXIT_FAILURE;

392

goto end;

694

goto fallback;

393

695

}

394

696

ret = set_cloexec_flag(pipefd[1]);

395

697

if(ret < 0){

396

698

perror("set_cloexec_flag");

397

699

exitstatus = EXIT_FAILURE;

398

goto end;

700

goto fallback;

399

701

}

400

702

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

401

703

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

402

704

if(ret < 0){

403

705

perror("sigprocmask");

404

706

exitstatus = EXIT_FAILURE;

405

goto end;

707

goto fallback;

406

708

}

407

709

// Starting a new process to be watched

408

710

pid_t pid = fork();

711

if(pid == -1){

712

perror("fork");

713

exitstatus = EXIT_FAILURE;

714

goto fallback;

715

}

409

716

if(pid == 0){

410

717

/* this is the child process */

411

718

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

418

725

perror("sigprocmask");

419

726

_exit(EXIT_FAILURE);

420

727

}

421

dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */

728

729

ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */

730

if(ret == -1){

731

perror("dup2");

732

_exit(EXIT_FAILURE);

733

}

422

734

423

735

if(dirfd(dir) < 0){

424

736

/* If dir has no file descriptor, we could not set FD_CLOEXEC

425

737

above and must now close it manually here. */

426

738

closedir(dir);

427

739

}

428

if(execv(filename, p->argv) < 0){

429

perror("execv");

430

_exit(EXIT_FAILURE);

740

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

741

if(execv(filename, p->argv) < 0){

742

perror("execv");

743

_exit(EXIT_FAILURE);

744

}

745

} else {

746

if(execve(filename, p->argv, p->environ) < 0){

747

perror("execve");

748

_exit(EXIT_FAILURE);

749

}

431

750

}

432

751

/* no return */

433

752

}

442

761

perror("sigprocmask");

443

762

}

444

763

exitstatus = EXIT_FAILURE;

445

goto end;

764

goto fallback;

446

765

}

447

766

448

767

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

456

775

if(ret < 0){

457

776

perror("sigprocmask");

458

777

exitstatus = EXIT_FAILURE;

459

goto end;

778

goto fallback;

460

779

}

461

780

462

781

FD_SET(new_process->fd, &rfds_all);

467

786

468

787

}

469

788

470

/* Free the plugin list */

471

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

472

next = plugin_list->next;

473

free(plugin_list->argv);

474

free(plugin_list);

475

}

789

free_plugin_list(plugin_list);

476

790

477

791

closedir(dir);

478

792

dir = NULL;

479

793

480

794

if (process_list == NULL){

481

fprintf(stderr, "No plugin processes started, exiting\n");

482

exitstatus = EXIT_FAILURE;

483

goto end;

795

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

796

" directory?\n");

797

process_list = NULL;

484

798

}

485

799

while(process_list){

486

800

fd_set rfds = rfds_all;

488

802

if (select_ret == -1){

489

803

perror("select");

490

804

exitstatus = EXIT_FAILURE;

491

goto end;

805

goto fallback;

492

806

}

493

807

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

494

808

from one of them */

501

815

/* Bad exit by plugin */

502

816

if(debug){

503

817

if(WIFEXITED(proc->status)){

504

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

505

proc->pid, WEXITSTATUS(proc->status));

818

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

819

(unsigned int) (proc->pid),

820

WEXITSTATUS(proc->status));

506

821

} else if(WIFSIGNALED(proc->status)) {

507

fprintf(stderr, "Plugin %d killed by signal %d\n",

508

proc->pid, WTERMSIG(proc->status));

822

fprintf(stderr, "Plugin %u killed by signal %d\n",

823

(unsigned int) (proc->pid),

824

WTERMSIG(proc->status));

509

825

} else if(WCOREDUMP(proc->status)){

510

fprintf(stderr, "Plugin %d dumped core\n", proc->pid);

826

fprintf(stderr, "Plugin %d dumped core\n",

827

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

511

828

}

512

829

}

513

830

/* Remove the plugin */

517

834

if(ret < 0){

518

835

perror("sigprocmask");

519

836

exitstatus = EXIT_FAILURE;

520

goto end;

837

goto fallback;

521

838

}

522

839

/* Delete this process entry from the list */

523

840

if(process_list == proc){

546

863

break;

547

864

}

548

865

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

549

for(size_t written = 0; written < proc->buffer_length;

550

written += (size_t)ret){

551

ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,

552

proc->buffer + written,

553

proc->buffer_length

554

- written));

555

if(ret < 0){

556

perror("write");

557

exitstatus = EXIT_FAILURE;

558

goto end;

559

}

866

867

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

868

if(not bret){

869

perror("print_out_password");

870

exitstatus = EXIT_FAILURE;

560

871

}

561

goto end;

872

goto fallback;

562

873

}

563

874

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

564

875

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

572

883

if (proc->buffer == NULL){

573

884

perror("malloc");

574

885

exitstatus = EXIT_FAILURE;

575

goto end;

886

goto fallback;

576

887

}

577

888

proc->buffer_size += BUFFER_SIZE;

578

889

}

591

902

}

592

903

}

593

904

}

594

if(process_list == NULL){

595

fprintf(stderr, "All plugin processes failed, exiting\n");

596

exitstatus = EXIT_FAILURE;

905

906

907

fallback:

908

909

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

910

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

911

bool bret;

912

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

913

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

914

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

915

if(not bret){

916

perror("print_out_password");

917

exitstatus = EXIT_FAILURE;

918

}

597

919

}

598

920

599

end:

600

921

/* Restore old signal handler */

601

sigaction(SIGCHLD, &old_sigchld_action, NULL);

602

603

/* Free the plugin list */

604

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

605

next = plugin_list->next;

606

free(plugin_list->argv);

607

free(plugin_list);

608

}

922

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

923

if(ret == -1){

924

perror("sigaction");

925

exitstatus = EXIT_FAILURE;

926

}

927

928

if(custom_argv != NULL){

929

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

930

free(*arg);

931

}

932

free(custom_argv);

933

}

934

free_plugin_list(plugin_list);

609

935

610

936

if(dir != NULL){

611

937

closedir(dir);

615

941

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

616

942

next = process_list->next;

617

943

close(process_list->fd);

618

kill(process_list->pid, SIGTERM);

944

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

945

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

946

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

947

perror("kill");

948

}

619

949

free(process_list->buffer);

620

950

free(process_list);

621

951

}