/mandos/release : revision 50

21

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

22

*/

23

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() */

24

#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */

25

26

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

27

stderr, STDOUT_FILENO */

42

28

#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() */

43

34

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

44

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

35

readdir(), closedir() */

36

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

45

37

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

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() */

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() */

55

48

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

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 */

49

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

50

struct argp_state, struct argp,

51

argp_parse() */

65

52

66

53

#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>";

71

54

72

55

struct process;

73

56

87

70

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

88

71

char **argv;

89

72

int argc;

90

char **environ;

91

int envc;

92

73

bool disabled;

93

74

struct plugin *next;

94

75

} plugin;

103

84

/* Create a new plugin */

104

85

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

105

86

if (new_plugin == NULL){

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

87

perror("malloc");

88

exit(EXIT_FAILURE);

89

}

90

new_plugin->name = name;

119

91

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

120

92

if (new_plugin->argv == NULL){

121

free(new_plugin);

122

return NULL;

93

perror("malloc");

94

exit(EXIT_FAILURE);

123

95

}

124

new_plugin->argv[0] = copy_name;

96

new_plugin->argv[0] = name;

125

97

new_plugin->argv[1] = NULL;

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;

98

new_plugin->argc = 1;

99

new_plugin->disabled = false;

100

new_plugin->next = *plugin_list;

134

101

/* Append the new plugin to the list */

135

102

*plugin_list = new_plugin;

136

103

return new_plugin;

137

104

}

138

105

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

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

}

178

116

179

117

/*

180

118

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

192

130

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

193

131

}

194

132

133

const char *argp_program_version = "plugbasedclient 0.9";

134

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

135

195

136

process *process_list = NULL;

196

137

197

138

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

200

141

process *proc = process_list;

201

142

int status;

202

143

pid_t pid = wait(&status);

203

if(pid == -1){

204

perror("wait");

205

return;

206

}

207

144

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

208

145

proc = proc->next;

209

146

}

215

152

proc->completed = true;

216

153

}

217

154

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

270

155

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

271

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

272

const char *argfile = ARGFILE;

273

FILE *conffp;

156

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

274

157

size_t d_name_len;

275

158

DIR *dir = NULL;

276

159

struct dirent *dirst;

284

167

struct sigaction old_sigchld_action;

285

168

struct sigaction sigchld_action = { .sa_handler = handle_sigchld,

286

169

.sa_flags = SA_NOCLDSTOP };

287

char **custom_argv = NULL;

288

int custom_argc = 0;

170

char *plus_options = NULL;

171

char **plus_argv = NULL;

289

172

290

173

/* Establish a signal handler */

291

174

sigemptyset(&sigchld_action.sa_mask);

292

175

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

293

if(ret == -1){

176

if(ret < 0){

294

177

perror("sigaddset");

295

exitstatus = EXIT_FAILURE;

296

goto fallback;

178

exit(EXIT_FAILURE);

297

179

}

298

180

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

299

if(ret == -1){

181

if(ret < 0){

300

182

perror("sigaction");

301

exitstatus = EXIT_FAILURE;

302

goto fallback;

183

exit(EXIT_FAILURE);

303

184

}

304

185

305

186

/* The options we understand. */

307

188

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

308

189

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

309

190

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

310

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

311

.arg = "VAR=value",

312

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

313

191

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

314

192

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

315

193

.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" },

319

194

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

320

195

.arg = "PLUGIN",

321

196

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

340

215

switch (key) {

341

216

case 'g':

342

217

if (arg != NULL){

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

}

218

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

219

do{

220

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

221

p = strtok(NULL, ",");

222

} while (p != NULL);

367

223

}

368

224

break;

369

225

case 'o':

370

226

if (arg != NULL){

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");

227

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

228

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

229

if(p != NULL){

230

p = strtok(p, ",");

231

do{

232

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

233

p = strtok(NULL, ",");

234

} while (p != NULL);

409

235

}

410

236

}

411

237

break;

412

238

case 'd':

413

239

if (arg != NULL){

414

plugin *p = getplugin(arg, plugins);

415

if(p == NULL){

416

return ARGP_ERR_UNKNOWN;

417

}

418

p->disabled = true;

240

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

419

241

}

420

242

break;

421

243

case 128:

431

253

debug = true;

432

254

break;

433

255

case ARGP_KEY_ARG:

434

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

256

if(plus_options != NULL or arg == NULL or arg[0] != '+'){

257

argp_usage (state);

258

}

259

plus_options = arg;

435

260

break;

436

261

case ARGP_KEY_END:

437

262

break;

447

272

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

448

273

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

449

274

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

}

275

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

276

277

if(plus_options){

278

/* This is a mangled argument in the form of

279

"+--option+--other-option=parameter+--yet-another-option", etc */

280

/* Make new argc and argv vars, and call argp_parse() again. */

281

plus_options++; /* skip the first '+' character */

282

const char delims[] = "+";

283

char *arg;

284

int new_argc = 1;

285

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

286

if(plus_argv == NULL){

287

perror("malloc");

288

exitstatus = EXIT_FAILURE;

289

goto end;

290

}

291

plus_argv[0] = argv[0];

292

plus_argv[1] = NULL;

293

arg = strtok(plus_options, delims); /* Get first argument */

294

while(arg != NULL){

295

new_argc++;

296

plus_argv = realloc(plus_argv, sizeof(char *)

297

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

298

if(plus_argv == NULL){

299

perror("malloc");

300

exitstatus = EXIT_FAILURE;

301

goto end;

302

}

303

plus_argv[new_argc-1] = arg;

304

plus_argv[new_argc] = NULL;

305

arg = strtok(NULL, delims); /* Get next argument */

306

}

307

argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);

506

308

}

507

309

508

310

if(debug){

512

314

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

513

315

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

514

316

}

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

}

519

317

}

520

318

}

521

319

533

331

if(dir == NULL){

534

332

perror("Could not open plugin dir");

535

333

exitstatus = EXIT_FAILURE;

536

goto fallback;

334

goto end;

537

335

}

538

336

539

337

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

544

342

if(ret < 0){

545

343

perror("set_cloexec_flag");

546

344

exitstatus = EXIT_FAILURE;

547

goto fallback;

345

goto end;

548

346

}

549

347

}

550

348

}

556

354

557

355

// All directory entries have been processed

558

356

if(dirst == NULL){

559

if (errno == EBADF){

560

perror("readdir");

561

exitstatus = EXIT_FAILURE;

562

goto fallback;

563

}

564

357

break;

565

358

}

566

359

610

403

continue;

611

404

}

612

405

}

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

}

406

407

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

408

if (filename == NULL){

409

perror("malloc");

410

exitstatus = EXIT_FAILURE;

411

goto end;

412

}

413

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

414

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

415

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

416

417

stat(filename, &st);

627

418

628

419

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

629

420

if(debug){

633

424

free(filename);

634

425

continue;

635

426

}

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){

427

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

643

428

if(debug){

644

429

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

645

430

dirst->d_name);

647

432

free(filename);

648

433

continue;

649

434

}

435

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

650

436

{

651

437

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

652

438

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

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

439

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

440

addargument(p, *a);

441

}

442

}

683

443

int pipefd[2];

684

444

ret = pipe(pipefd);

685

445

if (ret == -1){

686

446

perror("pipe");

687

447

exitstatus = EXIT_FAILURE;

688

goto fallback;

448

goto end;

689

449

}

690

450

ret = set_cloexec_flag(pipefd[0]);

691

451

if(ret < 0){

692

452

perror("set_cloexec_flag");

693

453

exitstatus = EXIT_FAILURE;

694

goto fallback;

454

goto end;

695

455

}

696

456

ret = set_cloexec_flag(pipefd[1]);

697

457

if(ret < 0){

698

458

perror("set_cloexec_flag");

699

459

exitstatus = EXIT_FAILURE;

700

goto fallback;

460

goto end;

701

461

}

702

462

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

703

463

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

704

464

if(ret < 0){

705

465

perror("sigprocmask");

706

466

exitstatus = EXIT_FAILURE;

707

goto fallback;

467

goto end;

708

468

}

709

469

// Starting a new process to be watched

710

470

pid_t pid = fork();

711

if(pid == -1){

712

perror("fork");

713

exitstatus = EXIT_FAILURE;

714

goto fallback;

715

}

716

471

if(pid == 0){

717

472

/* this is the child process */

718

473

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

725

480

perror("sigprocmask");

726

481

_exit(EXIT_FAILURE);

727

482

}

728

729

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

730

if(ret == -1){

731

perror("dup2");

732

_exit(EXIT_FAILURE);

733

}

483

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

734

484

735

485

if(dirfd(dir) < 0){

736

486

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

737

487

above and must now close it manually here. */

738

488

closedir(dir);

739

489

}

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

}

490

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

491

perror("execv");

492

_exit(EXIT_FAILURE);

750

493

}

751

494

/* no return */

752

495

}

761

504

perror("sigprocmask");

762

505

}

763

506

exitstatus = EXIT_FAILURE;

764

goto fallback;

507

goto end;

765

508

}

766

509

767

510

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

775

518

if(ret < 0){

776

519

perror("sigprocmask");

777

520

exitstatus = EXIT_FAILURE;

778

goto fallback;

521

goto end;

779

522

}

780

523

781

524

FD_SET(new_process->fd, &rfds_all);

786

529

787

530

}

788

531

789

free_plugin_list(plugin_list);

532

/* Free the plugin list */

533

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

534

next = plugin_list->next;

535

free(plugin_list->argv);

536

free(plugin_list);

537

}

790

538

791

539

closedir(dir);

792

540

dir = NULL;

793

541

794

542

if (process_list == NULL){

795

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

796

" directory?\n");

797

process_list = NULL;

543

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

544

exitstatus = EXIT_FAILURE;

545

goto end;

798

546

}

799

547

while(process_list){

800

548

fd_set rfds = rfds_all;

802

550

if (select_ret == -1){

803

551

perror("select");

804

552

exitstatus = EXIT_FAILURE;

805

goto fallback;

553

goto end;

806

554

}

807

555

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

808

556

from one of them */

815

563

/* Bad exit by plugin */

816

564

if(debug){

817

565

if(WIFEXITED(proc->status)){

818

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

819

(unsigned int) (proc->pid),

820

WEXITSTATUS(proc->status));

566

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

567

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

821

568

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

822

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

823

(unsigned int) (proc->pid),

824

WTERMSIG(proc->status));

569

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

570

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

825

571

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

826

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

827

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

572

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

828

573

}

829

574

}

830

575

/* Remove the plugin */

834

579

if(ret < 0){

835

580

perror("sigprocmask");

836

581

exitstatus = EXIT_FAILURE;

837

goto fallback;

582

goto end;

838

583

}

839

584

/* Delete this process entry from the list */

840

585

if(process_list == proc){

863

608

break;

864

609

}

865

610

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

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;

611

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

612

written += (size_t)ret){

613

ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,

614

proc->buffer + written,

615

proc->buffer_length

616

- written));

617

if(ret < 0){

618

perror("write");

619

exitstatus = EXIT_FAILURE;

620

goto end;

621

}

871

622

}

872

goto fallback;

623

goto end;

873

624

}

874

625

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

875

626

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

883

634

if (proc->buffer == NULL){

884

635

perror("malloc");

885

636

exitstatus = EXIT_FAILURE;

886

goto fallback;

637

goto end;

887

638

}

888

639

proc->buffer_size += BUFFER_SIZE;

889

640

}

902

653

}

903

654

}

904

655

}

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

}

656

if(process_list == NULL){

657

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

658

exitstatus = EXIT_FAILURE;

919

659

}

920

660

661

end:

921

662

/* Restore old signal handler */

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);

663

sigaction(SIGCHLD, &old_sigchld_action, NULL);

664

665

free(plus_argv);

666

667

/* Free the plugin list */

668

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

669

next = plugin_list->next;

670

free(plugin_list->argv);

671

free(plugin_list);

672

}

935

673

936

674

if(dir != NULL){

937

675

closedir(dir);

941

679

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

942

680

next = process_list->next;

943

681

close(process_list->fd);

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

}

682

kill(process_list->pid, SIGTERM);

949

683

free(process_list->buffer);

950

684

free(process_list);

951

685

}