/mandos/trunk : revision 24.1.67

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,

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 */

52

66

53

67

#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>";

54

72

55

73

struct process;

56

74

61

79

size_t buffer_size;

62

80

size_t buffer_length;

63

81

bool eof;

64

bool completed;

65

int status;

82

volatile bool completed;

83

volatile int status;

66

84

struct process *next;

67

85

} process;

68

86

70

88

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

71

89

char **argv;

72

90

int argc;

91

char **environ;

92

int envc;

73

93

bool disabled;

74

94

struct plugin *next;

75

95

} plugin;

84

104

/* Create a new plugin */

85

105

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

86

106

if (new_plugin == NULL){

87

perror("malloc");

88

exit(EXIT_FAILURE);

89

}

90

new_plugin->name = name;

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

91

123

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

92

124

if (new_plugin->argv == NULL){

93

perror("malloc");

94

exit(EXIT_FAILURE);

125

free(copy_name);

126

free(new_plugin);

127

return NULL;

95

128

}

96

new_plugin->argv[0] = name;

129

new_plugin->argv[0] = copy_name;

97

130

new_plugin->argv[1] = NULL;

98

new_plugin->argc = 1;

99

new_plugin->disabled = false;

100

new_plugin->next = *plugin_list;

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;

101

140

/* Append the new plugin to the list */

102

141

*plugin_list = new_plugin;

103

142

return new_plugin;

104

143

}

105

144

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

}

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

116

184

117

185

/*

118

186

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

130

198

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

131

199

}

132

200

133

const char *argp_program_version = "plugbasedclient 0.9";

134

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

135

136

201

process *process_list = NULL;

137

202

138

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

203

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

139

204

status. */

140

205

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

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;

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

static void free_plugin_list(plugin *plugin_list){

251

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

252

next = plugin_list->next;

253

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

254

free(*arg);

255

}

256

free(plugin_list->argv);

257

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

258

free(*env);

259

}

260

free(plugin_list->environ);

261

free(plugin_list);

262

}

153

263

}

154

264

155

265

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

156

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

266

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

267

const char *argfile = ARGFILE;

268

FILE *conffp;

157

269

size_t d_name_len;

158

270

DIR *dir = NULL;

159

271

struct dirent *dirst;

167

279

struct sigaction old_sigchld_action;

168

280

struct sigaction sigchld_action = { .sa_handler = handle_sigchld,

169

281

.sa_flags = SA_NOCLDSTOP };

170

char *plus_options = NULL;

171

char **plus_argv = NULL;

282

char **custom_argv = NULL;

283

int custom_argc = 0;

172

284

173

285

/* Establish a signal handler */

174

286

sigemptyset(&sigchld_action.sa_mask);

175

287

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

176

if(ret < 0){

288

if(ret == -1){

177

289

perror("sigaddset");

178

exit(EXIT_FAILURE);

290

exitstatus = EXIT_FAILURE;

291

goto fallback;

179

292

}

180

293

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

181

if(ret < 0){

294

if(ret == -1){

182

295

perror("sigaction");

183

exit(EXIT_FAILURE);

296

exitstatus = EXIT_FAILURE;

297

goto fallback;

184

298

}

185

299

186

300

/* The options we understand. */

188

302

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

189

303

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

190

304

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

305

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

306

.arg = "VAR=value",

307

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

191

308

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

192

309

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

193

310

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

311

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

312

.arg = "PLUGIN:ENV=value",

313

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

194

314

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

195

315

.arg = "PLUGIN",

196

316

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

215

335

switch (key) {

216

336

case 'g':

217

337

if (arg != NULL){

218

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

219

do{

220

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

221

p = strtok(NULL, ",");

222

} while (p != NULL);

338

char *p;

339

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

340

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

341

continue;

342

}

343

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

344

perror("add_argument");

345

return ARGP_ERR_UNKNOWN;

346

}

347

}

348

}

349

break;

350

case 'e':

351

if(arg == NULL){

352

break;

353

}

354

{

355

char *envdef = strdup(arg);

356

if(envdef == NULL){

357

break;

358

}

359

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

360

perror("add_environment");

361

}

223

362

}

224

363

break;

225

364

case 'o':

226

365

if (arg != NULL){

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);

366

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

367

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

368

break;

369

}

370

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

371

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

372

break;

373

}

374

if(opt != NULL){

375

char *p;

376

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

377

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

378

continue;

379

}

380

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

381

perror("add_argument");

382

return ARGP_ERR_UNKNOWN;

383

}

384

}

385

}

386

}

387

break;

388

case 'f':

389

if(arg == NULL){

390

break;

391

}

392

{

393

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

394

if(envdef == NULL){

395

break;

396

}

397

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

398

if(p_name == NULL){

399

break;

400

}

401

envdef++;

402

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

403

perror("add_environment");

235

404

}

236

405

}

237

406

break;

238

407

case 'd':

239

408

if (arg != NULL){

240

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

409

plugin *p = getplugin(arg, plugins);

410

if(p == NULL){

411

return ARGP_ERR_UNKNOWN;

412

}

413

p->disabled = true;

241

414

}

242

415

break;

243

416

case 128:

253

426

debug = true;

254

427

break;

255

428

case ARGP_KEY_ARG:

256

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

257

argp_usage (state);

258

}

259

plus_options = arg;

429

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

260

430

break;

261

431

case ARGP_KEY_END:

262

432

break;

272

442

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

273

443

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

274

444

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){

445

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

446

if (ret == ARGP_ERR_UNKNOWN){

447

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

448

exitstatus = EXIT_FAILURE;

449

goto fallback;

450

}

451

452

conffp = fopen(argfile, "r");

453

if(conffp != NULL){

454

char *org_line = NULL;

455

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

456

size_t size = 0;

457

ssize_t sret;

458

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

459

const char comment_delim[] = "#";

460

461

custom_argc = 1;

462

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

463

if(custom_argv == NULL){

287

464

perror("malloc");

288

465

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);

466

goto fallback;

467

}

468

custom_argv[0] = argv[0];

469

custom_argv[1] = NULL;

470

471

while(true){

472

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

473

if(sret == -1){

474

break;

475

}

476

477

line = org_line;

478

arg = strsep(&line, comment_delim);

479

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

480

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

481

continue;

482

}

483

new_arg = strdup(p);

484

485

custom_argc += 1;

486

custom_argv = realloc(custom_argv, sizeof(char *)

487

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

488

if(custom_argv == NULL){

489

perror("realloc");

490

exitstatus = EXIT_FAILURE;

491

free(org_line);

492

goto fallback;

493

}

494

custom_argv[custom_argc-1] = new_arg;

495

custom_argv[custom_argc] = NULL;

496

}

497

}

498

free(org_line);

499

} else{

500

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

501

not affect opening plugins */

502

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

503

perror("fopen");

504

exitstatus = EXIT_FAILURE;

505

goto fallback;

506

}

507

}

508

509

if(custom_argv != NULL){

510

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

511

if (ret == ARGP_ERR_UNKNOWN){

512

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

513

exitstatus = EXIT_FAILURE;

514

goto fallback;

515

}

308

516

}

309

517

310

518

if(debug){

314

522

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

315

523

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

316

524

}

525

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

526

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

527

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

528

}

317

529

}

318

530

}

319

531

331

543

if(dir == NULL){

332

544

perror("Could not open plugin dir");

333

545

exitstatus = EXIT_FAILURE;

334

goto end;

546

goto fallback;

335

547

}

336

548

337

549

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

342

554

if(ret < 0){

343

555

perror("set_cloexec_flag");

344

556

exitstatus = EXIT_FAILURE;

345

goto end;

557

goto fallback;

346

558

}

347

559

}

348

560

}

354

566

355

567

// All directory entries have been processed

356

568

if(dirst == NULL){

569

if (errno == EBADF){

570

perror("readdir");

571

exitstatus = EXIT_FAILURE;

572

goto fallback;

573

}

357

574

break;

358

575

}

359

576

403

620

continue;

404

621

}

405

622

}

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);

623

624

char *filename;

625

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

626

if(ret < 0){

627

perror("asprintf");

628

continue;

629

}

630

631

ret = stat(filename, &st);

632

if (ret == -1){

633

perror("stat");

634

free(filename);

635

continue;

636

}

418

637

419

638

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

420

639

if(debug){

424

643

free(filename);

425

644

continue;

426

645

}

427

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

646

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

647

if(p == NULL){

648

perror("getplugin");

649

free(filename);

650

continue;

651

}

652

if(p->disabled){

428

653

if(debug){

429

654

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

430

655

dirst->d_name);

432

657

free(filename);

433

658

continue;

434

659

}

435

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

436

660

{

437

661

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

438

662

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

439

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

440

addargument(p, *a);

441

}

442

}

443

int pipefd[2];

663

if(g != NULL){

664

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

665

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

666

perror("add_argument");

667

}

668

}

669

/* Add global environment variables */

670

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

671

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

672

perror("add_environment");

673

}

674

}

675

}

676

}

677

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

678

using execve and need to duplicate the environment from this

679

process, too. */

680

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

681

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

682

char *copy = strdup(*e);

683

if(copy == NULL){

684

perror("strdup");

685

continue;

686

}

687

if(not add_environment(p, copy)){

688

perror("add_environment");

689

}

690

}

691

}

692

693

int pipefd[2];

444

694

ret = pipe(pipefd);

445

695

if (ret == -1){

446

696

perror("pipe");

447

697

exitstatus = EXIT_FAILURE;

448

goto end;

698

goto fallback;

449

699

}

450

700

ret = set_cloexec_flag(pipefd[0]);

451

701

if(ret < 0){

452

702

perror("set_cloexec_flag");

453

703

exitstatus = EXIT_FAILURE;

454

goto end;

704

goto fallback;

455

705

}

456

706

ret = set_cloexec_flag(pipefd[1]);

457

707

if(ret < 0){

458

708

perror("set_cloexec_flag");

459

709

exitstatus = EXIT_FAILURE;

460

goto end;

710

goto fallback;

461

711

}

462

712

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

463

713

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

464

714

if(ret < 0){

465

715

perror("sigprocmask");

466

716

exitstatus = EXIT_FAILURE;

467

goto end;

717

goto fallback;

468

718

}

469

719

// Starting a new process to be watched

470

720

pid_t pid = fork();

721

if(pid == -1){

722

perror("fork");

723

exitstatus = EXIT_FAILURE;

724

goto fallback;

725

}

471

726

if(pid == 0){

472

727

/* this is the child process */

473

728

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

480

735

perror("sigprocmask");

481

736

_exit(EXIT_FAILURE);

482

737

}

483

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

738

739

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

740

if(ret == -1){

741

perror("dup2");

742

_exit(EXIT_FAILURE);

743

}

484

744

485

745

if(dirfd(dir) < 0){

486

746

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

487

747

above and must now close it manually here. */

488

748

closedir(dir);

489

749

}

490

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

491

perror("execv");

492

_exit(EXIT_FAILURE);

750

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

751

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

752

perror("execv");

753

_exit(EXIT_FAILURE);

754

}

755

} else {

756

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

757

perror("execve");

758

_exit(EXIT_FAILURE);

759

}

493

760

}

494

761

/* no return */

495

762

}

504

771

perror("sigprocmask");

505

772

}

506

773

exitstatus = EXIT_FAILURE;

507

goto end;

774

goto fallback;

508

775

}

509

776

510

777

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

518

785

if(ret < 0){

519

786

perror("sigprocmask");

520

787

exitstatus = EXIT_FAILURE;

521

goto end;

788

goto fallback;

522

789

}

523

790

524

791

FD_SET(new_process->fd, &rfds_all);

529

796

530

797

}

531

798

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

}

799

free_plugin_list(plugin_list);

800

plugin_list = NULL;

538

801

539

802

closedir(dir);

540

803

dir = NULL;

541

804

542

805

if (process_list == NULL){

543

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

544

exitstatus = EXIT_FAILURE;

545

goto end;

806

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

807

" directory?\n");

808

process_list = NULL;

546

809

}

547

810

while(process_list){

548

811

fd_set rfds = rfds_all;

550

813

if (select_ret == -1){

551

814

perror("select");

552

815

exitstatus = EXIT_FAILURE;

553

goto end;

816

goto fallback;

554

817

}

555

818

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

556

819

from one of them */

563

826

/* Bad exit by plugin */

564

827

if(debug){

565

828

if(WIFEXITED(proc->status)){

566

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

567

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

829

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

830

(unsigned int) (proc->pid),

831

WEXITSTATUS(proc->status));

568

832

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

569

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

570

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

833

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

834

(unsigned int) (proc->pid),

835

WTERMSIG(proc->status));

571

836

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

572

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

837

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

838

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

573

839

}

574

840

}

575

841

/* Remove the plugin */

576

842

FD_CLR(proc->fd, &rfds_all);

577

843

/* Block signal while modifying process_list */

578

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

844

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

579

845

if(ret < 0){

580

846

perror("sigprocmask");

581

847

exitstatus = EXIT_FAILURE;

582

goto end;

848

goto fallback;

583

849

}

584

850

/* Delete this process entry from the list */

585

851

if(process_list == proc){

608

874

break;

609

875

}

610

876

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

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

}

877

878

bool bret = print_out_password(proc->buffer,

879

proc->buffer_length);

880

if(not bret){

881

perror("print_out_password");

882

exitstatus = EXIT_FAILURE;

622

883

}

623

goto end;

884

goto fallback;

624

885

}

625

886

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

626

887

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

634

895

if (proc->buffer == NULL){

635

896

perror("malloc");

636

897

exitstatus = EXIT_FAILURE;

637

goto end;

898

goto fallback;

638

899

}

639

900

proc->buffer_size += BUFFER_SIZE;

640

901

}

653

914

}

654

915

}

655

916

}

656

if(process_list == NULL){

657

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

658

exitstatus = EXIT_FAILURE;

917

918

919

fallback:

920

921

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

922

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

923

occured */

924

bool bret;

925

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

926

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

927

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

928

if(not bret){

929

perror("print_out_password");

930

exitstatus = EXIT_FAILURE;

931

}

659

932

}

660

933

661

end:

662

934

/* Restore old signal handler */

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

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

936

if(ret == -1){

937

perror("sigaction");

938

exitstatus = EXIT_FAILURE;

939

}

940

941

if(custom_argv != NULL){

942

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

943

free(*arg);

944

}

945

free(custom_argv);

946

}

947

free_plugin_list(plugin_list);

673

948

674

949

if(dir != NULL){

675

950

closedir(dir);

679

954

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

680

955

next = process_list->next;

681

956

close(process_list->fd);

682

kill(process_list->pid, SIGTERM);

957

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

958

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

959

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

960

perror("kill");

961

}

683

962

free(process_list->buffer);

684

963

free(process_list);

685

964

}