/mandos/release : revision 103

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(),

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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(),

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wait() */

33

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

34

43

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

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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(),

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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

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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 */

66

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>";

52

72

53

73

struct process;

54

74

59

79

size_t buffer_size;

60

80

size_t buffer_length;

61

81

bool eof;

62

bool completed;

63

int status;

82

volatile bool completed;

83

volatile int status;

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84

struct process *next;

65

85

} process;

66

86

68

88

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

69

89

char **argv;

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90

int argc;

91

char **environ;

92

int envc;

71

93

bool disabled;

72

94

struct plugin *next;

73

95

} plugin;

74

96

75

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

97

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

76

98

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

77

99

if ((p->name == name)

78

100

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

82

104

/* Create a new plugin */

83

105

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

84

106

if (new_plugin == NULL){

85

perror("malloc");

86

exit(EXIT_FAILURE);

87

}

88

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

89

123

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

90

124

if (new_plugin->argv == NULL){

91

perror("malloc");

92

exit(EXIT_FAILURE);

125

free(copy_name);

126

free(new_plugin);

127

return NULL;

93

128

}

94

new_plugin->argv[0] = name;

129

new_plugin->argv[0] = copy_name;

95

130

new_plugin->argv[1] = NULL;

96

new_plugin->argc = 1;

97

new_plugin->disabled = false;

98

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;

99

140

/* Append the new plugin to the list */

100

141

*plugin_list = new_plugin;

101

142

return new_plugin;

102

143

}

103

144

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

}

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

114

184

115

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/*

116

186

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

117

187

* Descriptor Flags".

118

188

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

119

189

*/

120

int set_cloexec_flag(int fd)

190

static int set_cloexec_flag(int fd)

121

191

{

122

192

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

123

193

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

128

198

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

129

199

}

130

200

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

136

201

process *process_list = NULL;

137

202

138

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

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/* 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

}

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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

258

parsing */

259

argv[1] = NULL;

260

}

261

*argc += 1;

262

argv = realloc(argv, sizeof(char *)

263

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

264

if(argv == NULL){

265

return NULL;

266

}

267

argv[*argc-1] = arg;

268

argv[*argc] = NULL;

269

return argv;

270

}

271

272

static void free_plugin_list(plugin *plugin_list){

273

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

274

next = plugin_list->next;

275

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

276

free(*arg);

277

}

278

free(plugin_list->argv);

279

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

280

free(*env);

281

}

282

free(plugin_list->environ);

283

free(plugin_list);

284

}

153

285

}

154

286

155

287

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

156

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

288

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

289

const char *argfile = ARGFILE;

290

FILE *conffp;

157

291

size_t d_name_len;

158

292

DIR *dir = NULL;

159

293

struct dirent *dirst;

167

301

struct sigaction old_sigchld_action;

168

302

struct sigaction sigchld_action = { .sa_handler = handle_sigchld,

169

303

.sa_flags = SA_NOCLDSTOP };

170

char *plus_options = NULL;

171

char **plus_argv = NULL;

304

char **custom_argv = NULL;

305

int custom_argc = 0;

172

306

173

307

/* Establish a signal handler */

174

308

sigemptyset(&sigchld_action.sa_mask);

175

309

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

176

if(ret < 0){

310

if(ret == -1){

177

311

perror("sigaddset");

178

exit(EXIT_FAILURE);

312

exitstatus = EXIT_FAILURE;

313

goto fallback;

179

314

}

180

315

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

181

if(ret < 0){

316

if(ret == -1){

182

317

perror("sigaction");

183

exit(EXIT_FAILURE);

318

exitstatus = EXIT_FAILURE;

319

goto fallback;

184

320

}

185

321

186

322

/* The options we understand. */

188

324

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

189

325

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

190

326

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

327

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

328

.arg = "VAR=value",

329

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

191

330

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

192

331

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

193

332

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

333

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

334

.arg = "PLUGIN:ENV=value",

335

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

194

336

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

195

337

.arg = "PLUGIN",

196

338

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

215

357

switch (key) {

216

358

case 'g':

217

359

if (arg != NULL){

218

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

219

do{

220

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

221

p = strtok(NULL, ",");

222

} while (p != NULL);

360

char *p;

361

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

362

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

363

continue;

364

}

365

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

366

perror("add_argument");

367

return ARGP_ERR_UNKNOWN;

368

}

369

}

370

}

371

break;

372

case 'e':

373

if(arg == NULL){

374

break;

375

}

376

{

377

char *envdef = strdup(arg);

378

if(envdef == NULL){

379

break;

380

}

381

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

382

perror("add_environment");

383

}

223

384

}

224

385

break;

225

386

case 'o':

226

387

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);

388

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

389

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

390

break;

391

}

392

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

393

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

394

break;

395

}

396

if(opt != NULL){

397

char *p;

398

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

399

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

400

continue;

401

}

402

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

403

perror("add_argument");

404

return ARGP_ERR_UNKNOWN;

405

}

406

}

407

}

408

}

409

break;

410

case 'f':

411

if(arg == NULL){

412

break;

413

}

414

{

415

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

416

if(envdef == NULL){

417

break;

418

}

419

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

420

if(p_name == NULL){

421

break;

422

}

423

envdef++;

424

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

425

perror("add_environment");

235

426

}

236

427

}

237

428

break;

238

429

case 'd':

239

430

if (arg != NULL){

240

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

431

plugin *p = getplugin(arg, plugins);

432

if(p == NULL){

433

return ARGP_ERR_UNKNOWN;

434

}

435

p->disabled = true;

241

436

}

242

437

break;

243

438

case 128:

253

448

debug = true;

254

449

break;

255

450

case ARGP_KEY_ARG:

256

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

257

argp_usage (state);

258

}

259

plus_options = arg;

451

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

260

452

break;

261

453

case ARGP_KEY_END:

262

454

break;

272

464

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

273

465

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

274

466

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);

467

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

468

if (ret == ARGP_ERR_UNKNOWN){

469

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

470

exitstatus = EXIT_FAILURE;

471

goto fallback;

472

}

473

474

conffp = fopen(argfile, "r");

475

if(conffp != NULL){

476

char *org_line = NULL;

477

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

478

size_t size = 0;

479

ssize_t sret;

480

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

481

const char comment_delim[] = "#";

482

483

while(true){

484

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

485

if(sret == -1){

486

break;

487

}

488

489

line = org_line;

490

arg = strsep(&line, comment_delim);

491

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

492

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

493

continue;

494

}

495

new_arg = strdup(p);

496

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

497

if (custom_argv == NULL){

498

perror("add_to_argv");

499

exitstatus = EXIT_FAILURE;

500

goto fallback;

501

}

502

}

503

}

504

free(org_line);

505

} else{

506

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

507

not affect opening plugins */

508

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

509

perror("fopen");

510

exitstatus = EXIT_FAILURE;

511

goto fallback;

512

}

513

}

514

515

if(custom_argv != NULL){

516

custom_argv[0] = argv[0];

517

ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0,

518

&plugin_list);

519

if (ret == ARGP_ERR_UNKNOWN){

520

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

521

exitstatus = EXIT_FAILURE;

522

goto fallback;

523

}

308

524

}

309

525

310

526

if(debug){

314

530

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

315

531

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

316

532

}

533

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

534

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

535

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

536

}

317

537

}

318

538

}

319

539

324

544

325

545

setgid(gid);

326

546

if (ret == -1){

327

perror("setuid");

547

perror("setgid");

328

548

}

329

549

330

550

dir = opendir(plugindir);

331

551

if(dir == NULL){

332

552

perror("Could not open plugin dir");

333

553

exitstatus = EXIT_FAILURE;

334

goto end;

554

goto fallback;

335

555

}

336

556

337

557

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

342

562

if(ret < 0){

343

563

perror("set_cloexec_flag");

344

564

exitstatus = EXIT_FAILURE;

345

goto end;

565

goto fallback;

346

566

}

347

567

}

348

568

}

354

574

355

575

// All directory entries have been processed

356

576

if(dirst == NULL){

577

if (errno == EBADF){

578

perror("readdir");

579

exitstatus = EXIT_FAILURE;

580

goto fallback;

581

}

357

582

break;

358

583

}

359

584

403

628

continue;

404

629

}

405

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

632

char *filename;

633

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

634

if(ret < 0){

635

perror("asprintf");

636

continue;

637

}

638

639

ret = stat(filename, &st);

640

if (ret == -1){

641

perror("stat");

642

free(filename);

643

continue;

644

}

418

645

419

646

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

420

647

if(debug){

424

651

free(filename);

425

652

continue;

426

653

}

427

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

654

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

655

if(p == NULL){

656

perror("getplugin");

657

free(filename);

658

continue;

659

}

660

if(p->disabled){

428

661

if(debug){

429

662

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

430

663

dirst->d_name);

432

665

free(filename);

433

666

continue;

434

667

}

435

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

436

668

{

437

669

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

438

670

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];

671

if(g != NULL){

672

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

673

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

674

perror("add_argument");

675

}

676

}

677

/* Add global environment variables */

678

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

679

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

680

perror("add_environment");

681

}

682

}

683

}

684

}

685

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

686

using execve and need to duplicate the environment from this

687

process, too. */

688

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

689

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

690

char *copy = strdup(*e);

691

if(copy == NULL){

692

perror("strdup");

693

continue;

694

}

695

if(not add_environment(p, copy)){

696

perror("add_environment");

697

}

698

}

699

}

700

701

int pipefd[2];

444

702

ret = pipe(pipefd);

445

703

if (ret == -1){

446

704

perror("pipe");

447

705

exitstatus = EXIT_FAILURE;

448

goto end;

706

goto fallback;

449

707

}

450

708

ret = set_cloexec_flag(pipefd[0]);

451

709

if(ret < 0){

452

710

perror("set_cloexec_flag");

453

711

exitstatus = EXIT_FAILURE;

454

goto end;

712

goto fallback;

455

713

}

456

714

ret = set_cloexec_flag(pipefd[1]);

457

715

if(ret < 0){

458

716

perror("set_cloexec_flag");

459

717

exitstatus = EXIT_FAILURE;

460

goto end;

718

goto fallback;

461

719

}

462

720

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

463

721

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

464

722

if(ret < 0){

465

723

perror("sigprocmask");

466

724

exitstatus = EXIT_FAILURE;

467

goto end;

725

goto fallback;

468

726

}

469

727

// Starting a new process to be watched

470

728

pid_t pid = fork();

729

if(pid == -1){

730

perror("fork");

731

exitstatus = EXIT_FAILURE;

732

goto fallback;

733

}

471

734

if(pid == 0){

472

735

/* this is the child process */

473

736

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

480

743

perror("sigprocmask");

481

744

_exit(EXIT_FAILURE);

482

745

}

483

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

746

747

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

748

if(ret == -1){

749

perror("dup2");

750

_exit(EXIT_FAILURE);

751

}

484

752

485

753

if(dirfd(dir) < 0){

486

754

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

487

755

above and must now close it manually here. */

488

756

closedir(dir);

489

757

}

490

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

491

perror("execv");

492

_exit(EXIT_FAILURE);

758

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

759

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

760

perror("execv");

761

_exit(EXIT_FAILURE);

762

}

763

} else {

764

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

765

perror("execve");

766

_exit(EXIT_FAILURE);

767

}

493

768

}

494

769

/* no return */

495

770

}

504

779

perror("sigprocmask");

505

780

}

506

781

exitstatus = EXIT_FAILURE;

507

goto end;

782

goto fallback;

508

783

}

509

784

510

785

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

518

793

if(ret < 0){

519

794

perror("sigprocmask");

520

795

exitstatus = EXIT_FAILURE;

521

goto end;

796

goto fallback;

522

797

}

523

798

524

799

FD_SET(new_process->fd, &rfds_all);

529

804

530

805

}

531

806

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

free_plugin_list(plugin_list);

808

plugin_list = NULL;

538

809

539

810

closedir(dir);

540

811

dir = NULL;

541

812

542

813

if (process_list == NULL){

543

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

544

exitstatus = EXIT_FAILURE;

545

goto end;

814

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

815

" directory?\n");

816

process_list = NULL;

546

817

}

547

818

while(process_list){

548

819

fd_set rfds = rfds_all;

550

821

if (select_ret == -1){

551

822

perror("select");

552

823

exitstatus = EXIT_FAILURE;

553

goto end;

824

goto fallback;

554

825

}

555

826

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

556

827

from one of them */

563

834

/* Bad exit by plugin */

564

835

if(debug){

565

836

if(WIFEXITED(proc->status)){

566

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

567

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

837

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

838

(unsigned int) (proc->pid),

839

WEXITSTATUS(proc->status));

568

840

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

569

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

570

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

841

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

842

(unsigned int) (proc->pid),

843

WTERMSIG(proc->status));

571

844

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

572

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

845

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

846

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

573

847

}

574

848

}

575

849

/* Remove the plugin */

576

850

FD_CLR(proc->fd, &rfds_all);

577

851

/* Block signal while modifying process_list */

578

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

852

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

579

853

if(ret < 0){

580

854

perror("sigprocmask");

581

855

exitstatus = EXIT_FAILURE;

582

goto end;

856

goto fallback;

583

857

}

584

858

/* Delete this process entry from the list */

585

859

if(process_list == proc){

608

882

break;

609

883

}

610

884

/* 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

}

885

886

bool bret = print_out_password(proc->buffer,

887

proc->buffer_length);

888

if(not bret){

889

perror("print_out_password");

890

exitstatus = EXIT_FAILURE;

622

891

}

623

goto end;

892

goto fallback;

624

893

}

625

894

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

626

895

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

634

903

if (proc->buffer == NULL){

635

904

perror("malloc");

636

905

exitstatus = EXIT_FAILURE;

637

goto end;

906

goto fallback;

638

907

}

639

908

proc->buffer_size += BUFFER_SIZE;

640

909

}

653

922

}

654

923

}

655

924

}

656

if(process_list == NULL){

657

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

658

exitstatus = EXIT_FAILURE;

925

926

927

fallback:

928

929

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

930

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

931

occured */

932

bool bret;

933

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

934

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

935

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

936

if(not bret){

937

perror("print_out_password");

938

exitstatus = EXIT_FAILURE;

939

}

659

940

}

660

941

661

end:

662

942

/* 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

}

943

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

944

if(ret == -1){

945

perror("sigaction");

946

exitstatus = EXIT_FAILURE;

947

}

948

949

if(custom_argv != NULL){

950

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

951

free(*arg);

952

}

953

free(custom_argv);

954

}

955

free_plugin_list(plugin_list);

673

956

674

957

if(dir != NULL){

675

958

closedir(dir);

679

962

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

680

963

next = process_list->next;

681

964

close(process_list->fd);

682

kill(process_list->pid, SIGTERM);

965

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

966

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

967

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

968

perror("kill");

969

}

683

970

free(process_list->buffer);

684

971

free(process_list);

685

972

}