/mandos/release : revision 24.1.10

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 */

65

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>";

49

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

50

struct argp_state, struct argp,

51

argp_parse() */

71

52

72

53

struct process;

73

54

87

68

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

88

69

char **argv;

89

70

int argc;

90

char **environ;

91

int envc;

92

71

bool disabled;

93

72

struct plugin *next;

94

73

} plugin;

95

74

96

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

75

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

97

76

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

98

77

if ((p->name == name)

99

78

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

103

82

/* Create a new plugin */

104

83

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

105

84

if (new_plugin == NULL){

106

return NULL;

107

}

108

char *copy_name = NULL;

109

if(name != NULL){

110

copy_name = strdup(name);

111

if(copy_name == NULL){

112

return NULL;

113

}

114

}

115

116

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

117

.argc = 1,

118

.envc = 0,

119

.disabled = false,

120

.next = *plugin_list };

121

85

perror("malloc");

86

exit(EXIT_FAILURE);

87

}

88

new_plugin->name = name;

122

89

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

123

90

if (new_plugin->argv == NULL){

124

free(copy_name);

125

free(new_plugin);

126

return NULL;

91

perror("malloc");

92

exit(EXIT_FAILURE);

127

93

}

128

new_plugin->argv[0] = copy_name;

94

new_plugin->argv[0] = name;

129

95

new_plugin->argv[1] = NULL;

130

131

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

132

if(new_plugin->environ == NULL){

133

free(copy_name);

134

free(new_plugin->argv);

135

free(new_plugin);

136

return NULL;

137

}

138

new_plugin->environ[0] = NULL;

96

new_plugin->argc = 1;

97

new_plugin->disabled = false;

98

new_plugin->next = *plugin_list;

139

99

/* Append the new plugin to the list */

140

100

*plugin_list = new_plugin;

141

101

return new_plugin;

142

102

}

143

103

144

/* Helper function for add_argument and add_environment */

145

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

146

int *len){

147

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

148

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

149

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

150

/* Malloc check */

151

if(*array == NULL){

152

return false;

153

}

154

/* Make a copy of the new string */

155

char *copy = strdup(new);

156

if(copy == NULL){

157

return false;

158

}

159

/* Insert the copy */

160

(*array)[*len] = copy;

161

(*len)++;

162

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

163

(*array)[*len] = NULL;

164

return true;

165

}

166

167

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

168

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

169

if(p == NULL){

170

return false;

171

}

172

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

173

}

174

175

/* Add to a plugin's environment */

176

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

177

if(p == NULL){

178

return false;

179

}

180

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

181

}

182

104

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

105

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

106

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

107

if (p->argv == NULL){

108

perror("malloc");

109

exit(EXIT_FAILURE);

110

}

111

p->argc++;

112

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

113

}

183

114

184

115

/*

185

116

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

186

117

* Descriptor Flags".

187

118

* *Note File Descriptor Flags:(libc)Descriptor Flags.

188

119

*/

189

static int set_cloexec_flag(int fd)

120

int set_cloexec_flag(int fd)

190

121

{

191

122

int ret = fcntl(fd, F_GETFD, 0);

192

123

/* If reading the flags failed, return error indication now. */

197

128

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

198

129

}

199

130

131

#define BUFFER_SIZE 256

132

133

const char *argp_program_version = "plugbasedclient 0.9";

134

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

135

200

136

process *process_list = NULL;

201

137

202

138

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

205

141

process *proc = process_list;

206

142

int status;

207

143

pid_t pid = wait(&status);

208

if(pid == -1){

209

perror("wait");

210

return;

211

}

212

144

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

213

145

proc = proc->next;

214

146

}

220

152

proc->completed = true;

221

153

}

222

154

223

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

224

ssize_t ret;

225

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

226

length--;

227

}

228

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

229

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

230

length - written));

231

if(ret < 0){

232

return false;

233

}

234

}

235

return true;

236

}

237

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;

244

}

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;

257

}

258

259

static void free_plugin_list(plugin *plugin_list){

260

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

261

next = plugin_list->next;

262

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

263

free(*arg);

264

}

265

free(plugin_list->argv);

266

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

267

free(*env);

268

}

269

free(plugin_list->environ);

270

free(plugin_list);

271

}

272

}

273

274

155

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

275

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

276

const char *argfile = ARGFILE;

277

FILE *conffp;

156

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

278

157

size_t d_name_len;

279

158

DIR *dir = NULL;

280

159

struct dirent *dirst;

288

167

struct sigaction old_sigchld_action;

289

168

struct sigaction sigchld_action = { .sa_handler = handle_sigchld,

290

169

.sa_flags = SA_NOCLDSTOP };

291

char **custom_argv = NULL;

292

int custom_argc = 0;

170

char *plus_options = NULL;

171

char **plus_argv = NULL;

293

172

294

173

/* Establish a signal handler */

295

174

sigemptyset(&sigchld_action.sa_mask);

296

175

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

297

if(ret == -1){

176

if(ret < 0){

298

177

perror("sigaddset");

299

exitstatus = EXIT_FAILURE;

300

goto fallback;

178

exit(EXIT_FAILURE);

301

179

}

302

180

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

303

if(ret == -1){

181

if(ret < 0){

304

182

perror("sigaction");

305

exitstatus = EXIT_FAILURE;

306

goto fallback;

183

exit(EXIT_FAILURE);

307

184

}

308

185

309

186

/* The options we understand. */

311

188

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

312

189

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

313

190

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

314

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

315

.arg = "VAR=value",

316

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

317

191

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

318

192

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

319

193

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

320

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

321

.arg = "PLUGIN:ENV=value",

322

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

323

194

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

324

195

.arg = "PLUGIN",

325

196

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

344

215

switch (key) {

345

216

case 'g':

346

217

if (arg != NULL){

347

char *p;

348

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

349

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

350

continue;

351

}

352

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

353

perror("add_argument");

354

return ARGP_ERR_UNKNOWN;

355

}

356

}

357

}

358

break;

359

case 'e':

360

if(arg == NULL){

361

break;

362

}

363

{

364

char *envdef = strdup(arg);

365

if(envdef == NULL){

366

break;

367

}

368

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

369

perror("add_environment");

370

}

218

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

219

do{

220

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

221

p = strtok(NULL, ",");

222

} while (p != NULL);

371

223

}

372

224

break;

373

225

case 'o':

374

226

if (arg != NULL){

375

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

376

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

377

break;

378

}

379

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

380

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

381

break;

382

}

383

if(opt != NULL){

384

char *p;

385

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

386

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

387

continue;

388

}

389

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

390

perror("add_argument");

391

return ARGP_ERR_UNKNOWN;

392

}

393

}

394

}

395

}

396

break;

397

case 'f':

398

if(arg == NULL){

399

break;

400

}

401

{

402

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

403

if(envdef == NULL){

404

break;

405

}

406

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

407

if(p_name == NULL){

408

break;

409

}

410

envdef++;

411

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

412

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);

413

235

}

414

236

}

415

237

break;

416

238

case 'd':

417

239

if (arg != NULL){

418

plugin *p = getplugin(arg, plugins);

419

if(p == NULL){

420

return ARGP_ERR_UNKNOWN;

421

}

422

p->disabled = true;

240

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

423

241

}

424

242

break;

425

243

case 128:

435

253

debug = true;

436

254

break;

437

255

case ARGP_KEY_ARG:

438

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;

439

260

break;

440

261

case ARGP_KEY_END:

441

262

break;

451

272

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

452

273

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

453

274

454

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

455

if (ret == ARGP_ERR_UNKNOWN){

456

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

457

exitstatus = EXIT_FAILURE;

458

goto fallback;

459

}

460

461

conffp = fopen(argfile, "r");

462

if(conffp != NULL){

463

char *org_line = NULL;

464

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

465

size_t size = 0;

466

ssize_t sret;

467

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

468

const char comment_delim[] = "#";

469

470

while(true){

471

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

472

if(sret == -1){

473

break;

474

}

475

476

line = org_line;

477

arg = strsep(&line, comment_delim);

478

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

479

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

480

continue;

481

}

482

new_arg = strdup(p);

483

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

484

if (custom_argv == NULL){

485

perror("add_to_argv");

486

exitstatus = EXIT_FAILURE;

487

goto fallback;

488

}

489

}

490

}

491

free(org_line);

492

} else{

493

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

494

not affect opening plugins */

495

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

496

perror("fopen");

497

exitstatus = EXIT_FAILURE;

498

goto fallback;

499

}

500

}

501

502

if(custom_argv != NULL){

503

custom_argv[0] = argv[0];

504

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

505

if (ret == ARGP_ERR_UNKNOWN){

506

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

507

exitstatus = EXIT_FAILURE;

508

goto fallback;

509

}

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);

510

308

}

511

309

512

310

if(debug){

516

314

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

517

315

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

518

316

}

519

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

520

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

521

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

522

}

523

317

}

524

318

}

525

319

530

324

531

325

setgid(gid);

532

326

if (ret == -1){

533

perror("setgid");

327

perror("setuid");

534

328

}

535

329

536

330

dir = opendir(plugindir);

537

331

if(dir == NULL){

538

332

perror("Could not open plugin dir");

539

333

exitstatus = EXIT_FAILURE;

540

goto fallback;

334

goto end;

541

335

}

542

336

543

337

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

548

342

if(ret < 0){

549

343

perror("set_cloexec_flag");

550

344

exitstatus = EXIT_FAILURE;

551

goto fallback;

345

goto end;

552

346

}

553

347

}

554

348

}

560

354

561

355

// All directory entries have been processed

562

356

if(dirst == NULL){

563

if (errno == EBADF){

564

perror("readdir");

565

exitstatus = EXIT_FAILURE;

566

goto fallback;

567

}

568

357

break;

569

358

}

570

359

614

403

continue;

615

404

}

616

405

}

617

618

char *filename;

619

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

620

if(ret < 0){

621

perror("asprintf");

622

continue;

623

}

624

625

ret = stat(filename, &st);

626

if (ret == -1){

627

perror("stat");

628

free(filename);

629

continue;

630

}

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);

631

418

632

419

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

633

420

if(debug){

637

424

free(filename);

638

425

continue;

639

426

}

640

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

641

if(p == NULL){

642

perror("getplugin");

643

free(filename);

644

continue;

645

}

646

if(p->disabled){

427

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

647

428

if(debug){

648

429

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

649

430

dirst->d_name);

651

432

free(filename);

652

433

continue;

653

434

}

435

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

654

436

{

655

437

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

656

438

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

657

if(g != NULL){

658

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

659

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

660

perror("add_argument");

661

}

662

}

663

/* Add global environment variables */

664

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

665

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

666

perror("add_environment");

667

}

668

}

669

}

670

}

671

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

672

using execve and need to duplicate the environment from this

673

process, too. */

674

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

675

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

676

char *copy = strdup(*e);

677

if(copy == NULL){

678

perror("strdup");

679

continue;

680

}

681

if(not add_environment(p, copy)){

682

perror("add_environment");

683

}

684

}

685

}

686

687

int pipefd[2];

439

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

440

addargument(p, *a);

441

}

442

}

443

int pipefd[2];

688

444

ret = pipe(pipefd);

689

445

if (ret == -1){

690

446

perror("pipe");

691

447

exitstatus = EXIT_FAILURE;

692

goto fallback;

448

goto end;

693

449

}

694

450

ret = set_cloexec_flag(pipefd[0]);

695

451

if(ret < 0){

696

452

perror("set_cloexec_flag");

697

453

exitstatus = EXIT_FAILURE;

698

goto fallback;

454

goto end;

699

455

}

700

456

ret = set_cloexec_flag(pipefd[1]);

701

457

if(ret < 0){

702

458

perror("set_cloexec_flag");

703

459

exitstatus = EXIT_FAILURE;

704

goto fallback;

460

goto end;

705

461

}

706

462

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

707

463

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

708

464

if(ret < 0){

709

465

perror("sigprocmask");

710

466

exitstatus = EXIT_FAILURE;

711

goto fallback;

467

goto end;

712

468

}

713

469

// Starting a new process to be watched

714

470

pid_t pid = fork();

715

if(pid == -1){

716

perror("fork");

717

exitstatus = EXIT_FAILURE;

718

goto fallback;

719

}

720

471

if(pid == 0){

721

472

/* this is the child process */

722

473

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

729

480

perror("sigprocmask");

730

481

_exit(EXIT_FAILURE);

731

482

}

732

733

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

734

if(ret == -1){

735

perror("dup2");

736

_exit(EXIT_FAILURE);

737

}

483

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

738

484

739

485

if(dirfd(dir) < 0){

740

486

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

741

487

above and must now close it manually here. */

742

488

closedir(dir);

743

489

}

744

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

745

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

746

perror("execv");

747

_exit(EXIT_FAILURE);

748

}

749

} else {

750

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

751

perror("execve");

752

_exit(EXIT_FAILURE);

753

}

490

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

491

perror("execv");

492

_exit(EXIT_FAILURE);

754

493

}

755

494

/* no return */

756

495

}

765

504

perror("sigprocmask");

766

505

}

767

506

exitstatus = EXIT_FAILURE;

768

goto fallback;

507

goto end;

769

508

}

770

509

771

510

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

779

518

if(ret < 0){

780

519

perror("sigprocmask");

781

520

exitstatus = EXIT_FAILURE;

782

goto fallback;

521

goto end;

783

522

}

784

523

785

524

FD_SET(new_process->fd, &rfds_all);

790

529

791

530

}

792

531

793

free_plugin_list(plugin_list);

794

plugin_list = NULL;

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

}

795

538

796

539

closedir(dir);

797

540

dir = NULL;

798

541

799

542

if (process_list == NULL){

800

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

801

" directory?\n");

802

process_list = NULL;

543

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

544

exitstatus = EXIT_FAILURE;

545

goto end;

803

546

}

804

547

while(process_list){

805

548

fd_set rfds = rfds_all;

807

550

if (select_ret == -1){

808

551

perror("select");

809

552

exitstatus = EXIT_FAILURE;

810

goto fallback;

553

goto end;

811

554

}

812

555

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

813

556

from one of them */

820

563

/* Bad exit by plugin */

821

564

if(debug){

822

565

if(WIFEXITED(proc->status)){

823

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

824

(unsigned int) (proc->pid),

825

WEXITSTATUS(proc->status));

566

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

567

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

826

568

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

827

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

828

(unsigned int) (proc->pid),

829

WTERMSIG(proc->status));

569

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

570

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

830

571

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

831

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

832

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

572

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

833

573

}

834

574

}

835

575

/* Remove the plugin */

839

579

if(ret < 0){

840

580

perror("sigprocmask");

841

581

exitstatus = EXIT_FAILURE;

842

goto fallback;

582

goto end;

843

583

}

844

584

/* Delete this process entry from the list */

845

585

if(process_list == proc){

868

608

break;

869

609

}

870

610

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

871

872

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

873

if(not bret){

874

perror("print_out_password");

875

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

}

876

622

}

877

goto fallback;

623

goto end;

878

624

}

879

625

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

880

626

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

888

634

if (proc->buffer == NULL){

889

635

perror("malloc");

890

636

exitstatus = EXIT_FAILURE;

891

goto fallback;

637

goto end;

892

638

}

893

639

proc->buffer_size += BUFFER_SIZE;

894

640

}

907

653

}

908

654

}

909

655

}

910

911

912

fallback:

913

914

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

915

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

916

bool bret;

917

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

918

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

919

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

920

if(not bret){

921

perror("print_out_password");

922

exitstatus = EXIT_FAILURE;

923

}

656

if(process_list == NULL){

657

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

658

exitstatus = EXIT_FAILURE;

924

659

}

925

660

661

end:

926

662

/* Restore old signal handler */

927

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

928

if(ret == -1){

929

perror("sigaction");

930

exitstatus = EXIT_FAILURE;

931

}

932

933

if(custom_argv != NULL){

934

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

935

free(*arg);

936

}

937

free(custom_argv);

938

}

939

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

}

940

673

941

674

if(dir != NULL){

942

675

closedir(dir);

946

679

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

947

680

next = process_list->next;

948

681

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");

953

}

682

kill(process_list->pid, SIGTERM);

954

683

free(process_list->buffer);

955

684

free(process_list);

956

685

}