/mandos/release : revision 48

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,

60

error_t */

61

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

62

sigaddset(), sigaction(),

63

sigprocmask(), SIG_BLOCK, SIGCHLD,

64

SIG_UNBLOCK, kill() */

65

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

49

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

50

struct argp_state, struct argp,

51

argp_parse() */

66

52

67

53

#define BUFFER_SIZE 256

68

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

69

70

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

71

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

72

54

73

55

struct process;

74

56

79

61

size_t buffer_size;

80

62

size_t buffer_length;

81

63

bool eof;

82

volatile bool completed;

83

volatile int status;

64

bool completed;

65

int status;

84

66

struct process *next;

85

67

} process;

86

68

88

70

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

89

71

char **argv;

90

72

int argc;

91

char **environ;

92

int envc;

93

73

bool disabled;

94

74

struct plugin *next;

95

75

} plugin;

104

84

/* Create a new plugin */

105

85

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

106

86

if (new_plugin == NULL){

107

return NULL;

108

}

109

char *copy_name = NULL;

110

if(name != NULL){

111

copy_name = strdup(name);

112

if(copy_name == NULL){

113

return NULL;

114

}

115

}

116

117

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

118

.argc = 1,

119

.envc = 0,

120

.disabled = false,

121

.next = *plugin_list };

122

87

perror("malloc");

88

exit(EXIT_FAILURE);

89

}

90

new_plugin->name = name;

123

91

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

124

92

if (new_plugin->argv == NULL){

125

free(copy_name);

126

free(new_plugin);

127

return NULL;

93

perror("malloc");

94

exit(EXIT_FAILURE);

128

95

}

129

new_plugin->argv[0] = copy_name;

96

new_plugin->argv[0] = name;

130

97

new_plugin->argv[1] = NULL;

131

132

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

133

if(new_plugin->environ == NULL){

134

free(copy_name);

135

free(new_plugin->argv);

136

free(new_plugin);

137

return NULL;

138

}

139

new_plugin->environ[0] = NULL;

98

new_plugin->argc = 1;

99

new_plugin->disabled = false;

100

new_plugin->next = *plugin_list;

140

101

/* Append the new plugin to the list */

141

102

*plugin_list = new_plugin;

142

103

return new_plugin;

143

104

}

144

105

145

/* Helper function for add_argument and add_environment */

146

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

147

int *len){

148

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

149

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

150

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

151

/* Malloc check */

152

if(*array == NULL){

153

return false;

154

}

155

/* Make a copy of the new string */

156

char *copy = strdup(new);

157

if(copy == NULL){

158

return false;

159

}

160

/* Insert the copy */

161

(*array)[*len] = copy;

162

(*len)++;

163

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

164

(*array)[*len] = NULL;

165

return true;

166

}

167

168

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

169

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

170

if(p == NULL){

171

return false;

172

}

173

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

174

}

175

176

/* Add to a plugin's environment */

177

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

178

if(p == NULL){

179

return false;

180

}

181

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

182

}

183

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

}

184

116

185

117

/*

186

118

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

198

130

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

199

131

}

200

132

133

const char *argp_program_version = "plugbasedclient 0.9";

134

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

135

201

136

process *process_list = NULL;

202

137

203

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

138

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

204

139

status. */

205

140

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

206

while(true){

207

process *proc = process_list;

208

int status;

209

pid_t pid = waitpid(-1, &status, WNOHANG);

210

if(pid == 0){

211

/* Only still running child processes */

212

break;

213

}

214

if(pid == -1){

215

if (errno != ECHILD){

216

perror("waitpid");

217

}

218

/* No child processes */

219

break;

220

}

221

222

/* A child exited, find it in process_list */

223

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

224

proc = proc->next;

225

}

226

if(proc == NULL){

227

/* Process not found in process list */

228

continue;

229

}

230

proc->status = status;

231

proc->completed = true;

232

}

233

}

234

235

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

236

ssize_t ret;

237

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

238

length--;

239

}

240

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

241

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

242

length - written));

243

if(ret < 0){

244

return false;

245

}

246

}

247

return true;

248

}

249

250

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

251

if (argv == NULL){

252

*argc = 1;

253

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

254

if(argv == NULL){

255

return NULL;

256

}

257

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

258

argv[1] = NULL;

259

}

260

*argc += 1;

261

argv = realloc(argv, sizeof(char *)

262

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

263

if(argv == NULL){

264

return NULL;

265

}

266

argv[*argc-1] = arg;

267

argv[*argc] = NULL;

268

return argv;

269

}

270

271

static void free_plugin_list(plugin *plugin_list){

272

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

273

next = plugin_list->next;

274

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

275

free(*arg);

276

}

277

free(plugin_list->argv);

278

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

279

free(*env);

280

}

281

free(plugin_list->environ);

282

free(plugin_list);

283

}

141

process *proc = process_list;

142

int status;

143

pid_t pid = wait(&status);

144

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

145

proc = proc->next;

146

}

147

if(proc == NULL){

148

/* Process not found in process list */

149

return;

150

}

151

proc->status = status;

152

proc->completed = true;

284

153

}

285

154

286

155

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

287

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

288

const char *argfile = ARGFILE;

289

FILE *conffp;

156

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

290

157

size_t d_name_len;

291

158

DIR *dir = NULL;

292

159

struct dirent *dirst;

300

167

struct sigaction old_sigchld_action;

301

168

struct sigaction sigchld_action = { .sa_handler = handle_sigchld,

302

169

.sa_flags = SA_NOCLDSTOP };

303

char **custom_argv = NULL;

304

int custom_argc = 0;

170

char *plus_options = NULL;

171

char **plus_argv = NULL;

305

172

306

173

/* Establish a signal handler */

307

174

sigemptyset(&sigchld_action.sa_mask);

308

175

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

309

if(ret == -1){

176

if(ret < 0){

310

177

perror("sigaddset");

311

exitstatus = EXIT_FAILURE;

312

goto fallback;

178

exit(EXIT_FAILURE);

313

179

}

314

180

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

315

if(ret == -1){

181

if(ret < 0){

316

182

perror("sigaction");

317

exitstatus = EXIT_FAILURE;

318

goto fallback;

183

exit(EXIT_FAILURE);

319

184

}

320

185

321

186

/* The options we understand. */

323

188

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

324

189

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

325

190

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

326

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

327

.arg = "VAR=value",

328

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

329

191

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

330

192

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

331

193

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

332

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

333

.arg = "PLUGIN:ENV=value",

334

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

335

194

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

336

195

.arg = "PLUGIN",

337

196

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

356

215

switch (key) {

357

216

case 'g':

358

217

if (arg != NULL){

359

char *p;

360

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

361

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

362

continue;

363

}

364

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

365

perror("add_argument");

366

return ARGP_ERR_UNKNOWN;

367

}

368

}

369

}

370

break;

371

case 'e':

372

if(arg == NULL){

373

break;

374

}

375

{

376

char *envdef = strdup(arg);

377

if(envdef == NULL){

378

break;

379

}

380

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

381

perror("add_environment");

382

}

218

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

219

do{

220

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

221

p = strtok(NULL, ",");

222

} while (p != NULL);

383

223

}

384

224

break;

385

225

case 'o':

386

226

if (arg != NULL){

387

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

388

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

389

break;

390

}

391

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

392

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

393

break;

394

}

395

if(opt != NULL){

396

char *p;

397

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

398

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

399

continue;

400

}

401

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

402

perror("add_argument");

403

return ARGP_ERR_UNKNOWN;

404

}

405

}

406

}

407

}

408

break;

409

case 'f':

410

if(arg == NULL){

411

break;

412

}

413

{

414

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

415

if(envdef == NULL){

416

break;

417

}

418

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

419

if(p_name == NULL){

420

break;

421

}

422

envdef++;

423

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

424

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);

425

235

}

426

236

}

427

237

break;

428

238

case 'd':

429

239

if (arg != NULL){

430

plugin *p = getplugin(arg, plugins);

431

if(p == NULL){

432

return ARGP_ERR_UNKNOWN;

433

}

434

p->disabled = true;

240

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

435

241

}

436

242

break;

437

243

case 128:

447

253

debug = true;

448

254

break;

449

255

case ARGP_KEY_ARG:

450

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;

451

260

break;

452

261

case ARGP_KEY_END:

453

262

break;

463

272

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

464

273

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

465

274

466

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

467

if (ret == ARGP_ERR_UNKNOWN){

468

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

469

exitstatus = EXIT_FAILURE;

470

goto fallback;

471

}

472

473

conffp = fopen(argfile, "r");

474

if(conffp != NULL){

475

char *org_line = NULL;

476

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

477

size_t size = 0;

478

ssize_t sret;

479

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

480

const char comment_delim[] = "#";

481

482

while(true){

483

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

484

if(sret == -1){

485

break;

486

}

487

488

line = org_line;

489

arg = strsep(&line, comment_delim);

490

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

491

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

492

continue;

493

}

494

new_arg = strdup(p);

495

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

496

if (custom_argv == NULL){

497

perror("add_to_argv");

498

exitstatus = EXIT_FAILURE;

499

goto fallback;

500

}

501

}

502

}

503

free(org_line);

504

} else{

505

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

506

not affect opening plugins */

507

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

508

perror("fopen");

509

exitstatus = EXIT_FAILURE;

510

goto fallback;

511

}

512

}

513

514

if(custom_argv != NULL){

515

custom_argv[0] = argv[0];

516

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

517

if (ret == ARGP_ERR_UNKNOWN){

518

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

519

exitstatus = EXIT_FAILURE;

520

goto fallback;

521

}

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);

522

308

}

523

309

524

310

if(debug){

528

314

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

529

315

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

530

316

}

531

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

532

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

533

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

534

}

535

317

}

536

318

}

537

319

549

331

if(dir == NULL){

550

332

perror("Could not open plugin dir");

551

333

exitstatus = EXIT_FAILURE;

552

goto fallback;

334

goto end;

553

335

}

554

336

555

337

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

560

342

if(ret < 0){

561

343

perror("set_cloexec_flag");

562

344

exitstatus = EXIT_FAILURE;

563

goto fallback;

345

goto end;

564

346

}

565

347

}

566

348

}

572

354

573

355

// All directory entries have been processed

574

356

if(dirst == NULL){

575

if (errno == EBADF){

576

perror("readdir");

577

exitstatus = EXIT_FAILURE;

578

goto fallback;

579

}

580

357

break;

581

358

}

582

359

626

403

continue;

627

404

}

628

405

}

629

630

char *filename;

631

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

632

if(ret < 0){

633

perror("asprintf");

634

continue;

635

}

636

637

ret = stat(filename, &st);

638

if (ret == -1){

639

perror("stat");

640

free(filename);

641

continue;

642

}

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);

643

418

644

419

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

645

420

if(debug){

649

424

free(filename);

650

425

continue;

651

426

}

652

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

653

if(p == NULL){

654

perror("getplugin");

655

free(filename);

656

continue;

657

}

658

if(p->disabled){

427

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

659

428

if(debug){

660

429

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

661

430

dirst->d_name);

663

432

free(filename);

664

433

continue;

665

434

}

435

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

666

436

{

667

437

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

668

438

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

669

if(g != NULL){

670

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

671

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

672

perror("add_argument");

673

}

674

}

675

/* Add global environment variables */

676

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

677

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

678

perror("add_environment");

679

}

680

}

681

}

682

}

683

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

684

using execve and need to duplicate the environment from this

685

process, too. */

686

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

687

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

688

char *copy = strdup(*e);

689

if(copy == NULL){

690

perror("strdup");

691

continue;

692

}

693

if(not add_environment(p, copy)){

694

perror("add_environment");

695

}

696

}

697

}

698

699

int pipefd[2];

439

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

440

addargument(p, *a);

441

}

442

}

443

int pipefd[2];

700

444

ret = pipe(pipefd);

701

445

if (ret == -1){

702

446

perror("pipe");

703

447

exitstatus = EXIT_FAILURE;

704

goto fallback;

448

goto end;

705

449

}

706

450

ret = set_cloexec_flag(pipefd[0]);

707

451

if(ret < 0){

708

452

perror("set_cloexec_flag");

709

453

exitstatus = EXIT_FAILURE;

710

goto fallback;

454

goto end;

711

455

}

712

456

ret = set_cloexec_flag(pipefd[1]);

713

457

if(ret < 0){

714

458

perror("set_cloexec_flag");

715

459

exitstatus = EXIT_FAILURE;

716

goto fallback;

460

goto end;

717

461

}

718

462

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

719

463

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

720

464

if(ret < 0){

721

465

perror("sigprocmask");

722

466

exitstatus = EXIT_FAILURE;

723

goto fallback;

467

goto end;

724

468

}

725

469

// Starting a new process to be watched

726

470

pid_t pid = fork();

727

if(pid == -1){

728

perror("fork");

729

exitstatus = EXIT_FAILURE;

730

goto fallback;

731

}

732

471

if(pid == 0){

733

472

/* this is the child process */

734

473

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

741

480

perror("sigprocmask");

742

481

_exit(EXIT_FAILURE);

743

482

}

744

745

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

746

if(ret == -1){

747

perror("dup2");

748

_exit(EXIT_FAILURE);

749

}

483

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

750

484

751

485

if(dirfd(dir) < 0){

752

486

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

753

487

above and must now close it manually here. */

754

488

closedir(dir);

755

489

}

756

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

757

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

758

perror("execv");

759

_exit(EXIT_FAILURE);

760

}

761

} else {

762

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

763

perror("execve");

764

_exit(EXIT_FAILURE);

765

}

490

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

491

perror("execv");

492

_exit(EXIT_FAILURE);

766

493

}

767

494

/* no return */

768

495

}

777

504

perror("sigprocmask");

778

505

}

779

506

exitstatus = EXIT_FAILURE;

780

goto fallback;

507

goto end;

781

508

}

782

509

783

510

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

791

518

if(ret < 0){

792

519

perror("sigprocmask");

793

520

exitstatus = EXIT_FAILURE;

794

goto fallback;

521

goto end;

795

522

}

796

523

797

524

FD_SET(new_process->fd, &rfds_all);

802

529

803

530

}

804

531

805

free_plugin_list(plugin_list);

806

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

}

807

538

808

539

closedir(dir);

809

540

dir = NULL;

810

541

811

542

if (process_list == NULL){

812

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

813

" directory?\n");

814

process_list = NULL;

543

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

544

exitstatus = EXIT_FAILURE;

545

goto end;

815

546

}

816

547

while(process_list){

817

548

fd_set rfds = rfds_all;

819

550

if (select_ret == -1){

820

551

perror("select");

821

552

exitstatus = EXIT_FAILURE;

822

goto fallback;

553

goto end;

823

554

}

824

555

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

825

556

from one of them */

832

563

/* Bad exit by plugin */

833

564

if(debug){

834

565

if(WIFEXITED(proc->status)){

835

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

836

(unsigned int) (proc->pid),

837

WEXITSTATUS(proc->status));

566

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

567

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

838

568

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

839

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

840

(unsigned int) (proc->pid),

841

WTERMSIG(proc->status));

569

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

570

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

842

571

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

843

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

844

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

572

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

845

573

}

846

574

}

847

575

/* Remove the plugin */

848

576

FD_CLR(proc->fd, &rfds_all);

849

577

/* Block signal while modifying process_list */

850

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

578

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

851

579

if(ret < 0){

852

580

perror("sigprocmask");

853

581

exitstatus = EXIT_FAILURE;

854

goto fallback;

582

goto end;

855

583

}

856

584

/* Delete this process entry from the list */

857

585

if(process_list == proc){

880

608

break;

881

609

}

882

610

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

883

884

bool bret = print_out_password(proc->buffer,

885

proc->buffer_length);

886

if(not bret){

887

perror("print_out_password");

888

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

}

889

622

}

890

goto fallback;

623

goto end;

891

624

}

892

625

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

893

626

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

901

634

if (proc->buffer == NULL){

902

635

perror("malloc");

903

636

exitstatus = EXIT_FAILURE;

904

goto fallback;

637

goto end;

905

638

}

906

639

proc->buffer_size += BUFFER_SIZE;

907

640

}

920

653

}

921

654

}

922

655

}

923

924

925

fallback:

926

927

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

928

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

929

occured */

930

bool bret;

931

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

932

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

933

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

934

if(not bret){

935

perror("print_out_password");

936

exitstatus = EXIT_FAILURE;

937

}

656

if(process_list == NULL){

657

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

658

exitstatus = EXIT_FAILURE;

938

659

}

939

660

661

end:

940

662

/* Restore old signal handler */

941

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

942

if(ret == -1){

943

perror("sigaction");

944

exitstatus = EXIT_FAILURE;

945

}

946

947

if(custom_argv != NULL){

948

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

949

free(*arg);

950

}

951

free(custom_argv);

952

}

953

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

}

954

673

955

674

if(dir != NULL){

956

675

closedir(dir);

960

679

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

961

680

next = process_list->next;

962

681

close(process_list->fd);

963

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

964

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

965

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

966

perror("kill");

967

}

682

kill(process_list->pid, SIGTERM);

968

683

free(process_list->buffer);

969

684

free(process_list);

970

685

}