/mandos/release : revision 24.1.55

21

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

22

*/

23

24

#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */

25

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() */

51

close() */

52

#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,

53

FD_CLOEXEC */

54

#include <string.h> /* strsep, strlen(), strcpy(),

55

strcat() */

54

#include <string.h> /* strsep, strlen(), asprintf() */

56

55

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

57

56

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

58

57

argp_state, struct argp,

65

64

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

66

65

67

66

#define BUFFER_SIZE 256

68

#define ARGFILE "/conf/conf.d/mandos/plugins.conf"

67

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

69

68

70

69

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

71

70

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

88

87

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

89

88

char **argv;

90

89

int argc;

90

char **environ;

91

int envc;

91

92

bool disabled;

92

93

struct plugin *next;

93

94

} plugin;

102

103

/* Create a new plugin */

103

104

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

104

105

if (new_plugin == NULL){

105

perror("malloc");

106

exit(EXIT_FAILURE);

107

}

108

new_plugin->name = name;

106

return NULL;

107

}

108

char *copy_name = strdup(name);

109

if(copy_name == NULL){

110

return NULL;

111

}

112

113

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

114

.argc = 1,

115

.envc = 0,

116

.disabled = false,

117

.next = *plugin_list };

118

109

119

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

110

120

if (new_plugin->argv == NULL){

111

perror("malloc");

112

exit(EXIT_FAILURE);

121

free(new_plugin);

122

return NULL;

113

123

}

114

new_plugin->argv[0] = name;

124

new_plugin->argv[0] = copy_name;

115

125

new_plugin->argv[1] = NULL;

116

new_plugin->argc = 1;

117

new_plugin->disabled = false;

118

new_plugin->next = *plugin_list;

126

127

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

128

if(new_plugin->environ == NULL){

129

free(new_plugin->argv);

130

free(new_plugin);

131

return NULL;

132

}

133

new_plugin->environ[0] = NULL;

119

134

/* Append the new plugin to the list */

120

135

*plugin_list = new_plugin;

121

136

return new_plugin;

122

137

}

123

138

124

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

125

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

126

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

127

if (p->argv == NULL){

128

perror("malloc");

129

exit(EXIT_FAILURE);

130

}

131

p->argc++;

132

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

133

}

139

/* Helper function for add_argument and add_environment */

140

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

141

int *len){

142

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

143

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

144

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

145

/* Malloc check */

146

if(*array == NULL){

147

return false;

148

}

149

/* Make a copy of the new string */

150

char *copy = strdup(new);

151

if(copy == NULL){

152

return false;

153

}

154

/* Insert the copy */

155

(*array)[*len] = copy;

156

(*len)++;

157

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

158

(*array)[*len] = NULL;

159

return true;

160

}

161

162

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

163

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

164

if(p == NULL){

165

return false;

166

}

167

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

168

}

169

170

/* Add to a plugin's environment */

171

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

172

if(p == NULL){

173

return false;

174

}

175

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

176

}

177

134

178

135

179

/*

136

180

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

186

230

return true;

187

231

}

188

232

189

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

190

233

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

191

234

if (argv == NULL){

192

235

*argc = 1;

193

236

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

208

251

return argv;

209

252

}

210

253

254

static void free_plugin_list(plugin *plugin_list){

255

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

256

next = plugin_list->next;

257

free(plugin_list->name);

258

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

259

free(*arg);

260

}

261

free(plugin_list->argv);

262

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

263

free(*env);

264

}

265

free(plugin_list->environ);

266

free(plugin_list);

267

}

268

}

269

211

270

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

212

271

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

213

272

const char *argfile = ARGFILE;

231

290

/* Establish a signal handler */

232

291

sigemptyset(&sigchld_action.sa_mask);

233

292

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

234

if(ret < 0){

293

if(ret == -1){

235

294

perror("sigaddset");

236

exit(EXIT_FAILURE);

295

exitstatus = EXIT_FAILURE;

296

goto fallback;

237

297

}

238

298

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

239

if(ret < 0){

299

if(ret == -1){

240

300

perror("sigaction");

241

exit(EXIT_FAILURE);

301

exitstatus = EXIT_FAILURE;

302

goto fallback;

242

303

}

243

304

244

305

/* The options we understand. */

246

307

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

247

308

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

248

309

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

310

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

311

.arg = "VAR=value",

312

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

249

313

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

250

314

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

251

315

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

316

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

317

.arg = "PLUGIN:ENV=value",

318

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

252

319

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

253

320

.arg = "PLUGIN",

254

321

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

278

345

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

279

346

continue;

280

347

}

281

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

348

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

349

perror("add_argument");

350

return ARGP_ERR_UNKNOWN;

351

}

352

}

353

}

354

break;

355

case 'e':

356

if(arg == NULL){

357

break;

358

}

359

{

360

char *envdef = strdup(arg);

361

if(envdef == NULL){

362

break;

363

}

364

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

365

perror("add_environment");

282

366

}

283

367

}

284

368

break;

285

369

case 'o':

286

370

if (arg != NULL){

287

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

288

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

371

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

372

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

289

373

break;

290

374

}

291

375

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

298

382

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

299

383

continue;

300

384

}

301

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

385

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

386

perror("add_argument");

387

return ARGP_ERR_UNKNOWN;

388

}

302

389

}

303

390

}

304

391

}

305

392

break;

393

case 'f':

394

if(arg == NULL){

395

break;

396

}

397

{

398

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

399

if(envdef == NULL){

400

break;

401

}

402

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

403

if(p_name == NULL){

404

break;

405

}

406

envdef++;

407

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

408

perror("add_environment");

409

}

410

}

411

break;

306

412

case 'd':

307

413

if (arg != NULL){

308

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

414

plugin *p = getplugin(arg, plugins);

415

if(p == NULL){

416

return ARGP_ERR_UNKNOWN;

417

}

418

p->disabled = true;

309

419

}

310

420

break;

311

421

case 128:

321

431

debug = true;

322

432

break;

323

433

case ARGP_KEY_ARG:

324

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

434

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

325

435

break;

326

436

case ARGP_KEY_END:

327

437

break;

341

451

if (ret == ARGP_ERR_UNKNOWN){

342

452

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

343

453

exitstatus = EXIT_FAILURE;

344

goto end;

454

goto fallback;

345

455

}

346

456

347

457

conffp = fopen(argfile, "r");

348

458

if(conffp != NULL){

349

459

char *org_line = NULL;

460

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

350

461

size_t size = 0;

351

462

ssize_t sret;

352

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

353

463

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

354

464

const char comment_delim[] = "#";

355

465

366

476

continue;

367

477

}

368

478

new_arg = strdup(p);

369

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

479

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

370

480

if (custom_argv == NULL){

371

perror("addcustomargument");

481

perror("add_to_argv");

372

482

exitstatus = EXIT_FAILURE;

373

goto end;

483

goto fallback;

374

484

}

375

485

}

376

486

}

381

491

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

382

492

perror("fopen");

383

493

exitstatus = EXIT_FAILURE;

384

goto end;

494

goto fallback;

385

495

}

386

496

}

387

497

391

501

if (ret == ARGP_ERR_UNKNOWN){

392

502

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

393

503

exitstatus = EXIT_FAILURE;

394

goto end;

504

goto fallback;

395

505

}

396

506

}

397

507

402

512

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

403

513

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

404

514

}

515

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

516

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

517

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

518

}

405

519

}

406

520

}

407

521

419

533

if(dir == NULL){

420

534

perror("Could not open plugin dir");

421

535

exitstatus = EXIT_FAILURE;

422

goto end;

536

goto fallback;

423

537

}

424

538

425

539

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

430

544

if(ret < 0){

431

545

perror("set_cloexec_flag");

432

546

exitstatus = EXIT_FAILURE;

433

goto end;

547

goto fallback;

434

548

}

435

549

}

436

550

}

445

559

if (errno == EBADF){

446

560

perror("readdir");

447

561

exitstatus = EXIT_FAILURE;

448

goto end;

562

goto fallback;

449

563

}

450

564

break;

451

565

}

496

610

continue;

497

611

}

498

612

}

499

500

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

501

if (filename == NULL){

502

perror("malloc");

613

614

char *filename;

615

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

616

if(ret < 0){

617

perror("asprintf");

503

618

continue;

504

619

}

505

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

506

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

507

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

508

620

509

621

ret = stat(filename, &st);

510

622

if (ret == -1){

521

633

free(filename);

522

634

continue;

523

635

}

524

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

636

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

637

if(p == NULL){

638

perror("getplugin");

639

free(filename);

640

continue;

641

}

642

if(p->disabled){

525

643

if(debug){

526

644

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

527

645

dirst->d_name);

529

647

free(filename);

530

648

continue;

531

649

}

532

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

533

650

{

534

651

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

535

652

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

536

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

537

addargument(p, *a);

538

}

539

}

653

if(g != NULL){

654

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

655

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

656

perror("add_argument");

657

}

658

}

659

/* Add global environment variables */

660

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

661

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

662

perror("add_environment");

663

}

664

}

665

}

666

}

667

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

668

using execve and need to duplicate the environment from this

669

process, too. */

670

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

671

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

672

char *copy = strdup(*e);

673

if(copy == NULL){

674

perror("strdup");

675

continue;

676

}

677

if(not add_environment(p, copy)){

678

perror("add_environment");

679

}

680

}

681

}

682

540

683

int pipefd[2];

541

684

ret = pipe(pipefd);

542

685

if (ret == -1){

543

686

perror("pipe");

544

687

exitstatus = EXIT_FAILURE;

545

goto end;

688

goto fallback;

546

689

}

547

690

ret = set_cloexec_flag(pipefd[0]);

548

691

if(ret < 0){

549

692

perror("set_cloexec_flag");

550

693

exitstatus = EXIT_FAILURE;

551

goto end;

694

goto fallback;

552

695

}

553

696

ret = set_cloexec_flag(pipefd[1]);

554

697

if(ret < 0){

555

698

perror("set_cloexec_flag");

556

699

exitstatus = EXIT_FAILURE;

557

goto end;

700

goto fallback;

558

701

}

559

702

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

560

703

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

561

704

if(ret < 0){

562

705

perror("sigprocmask");

563

706

exitstatus = EXIT_FAILURE;

564

goto end;

707

goto fallback;

565

708

}

566

709

// Starting a new process to be watched

567

710

pid_t pid = fork();

568

711

if(pid == -1){

569

712

perror("fork");

570

713

exitstatus = EXIT_FAILURE;

571

goto end;

714

goto fallback;

572

715

}

573

716

if(pid == 0){

574

717

/* this is the child process */

594

737

above and must now close it manually here. */

595

738

closedir(dir);

596

739

}

597

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

598

perror("execv");

599

_exit(EXIT_FAILURE);

740

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

741

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

742

perror("execv");

743

_exit(EXIT_FAILURE);

744

}

745

} else {

746

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

747

perror("execve");

748

_exit(EXIT_FAILURE);

749

}

600

750

}

601

751

/* no return */

602

752

}

611

761

perror("sigprocmask");

612

762

}

613

763

exitstatus = EXIT_FAILURE;

614

goto end;

764

goto fallback;

615

765

}

616

766

617

767

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

625

775

if(ret < 0){

626

776

perror("sigprocmask");

627

777

exitstatus = EXIT_FAILURE;

628

goto end;

778

goto fallback;

629

779

}

630

780

631

781

FD_SET(new_process->fd, &rfds_all);

636

786

637

787

}

638

788

639

/* Free the plugin list */

640

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

641

next = plugin_list->next;

642

free(plugin_list->argv);

643

free(plugin_list);

644

}

789

free_plugin_list(plugin_list);

645

790

646

791

closedir(dir);

647

792

dir = NULL;

657

802

if (select_ret == -1){

658

803

perror("select");

659

804

exitstatus = EXIT_FAILURE;

660

goto end;

805

goto fallback;

661

806

}

662

807

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

663

808

from one of them */

689

834

if(ret < 0){

690

835

perror("sigprocmask");

691

836

exitstatus = EXIT_FAILURE;

692

goto end;

837

goto fallback;

693

838

}

694

839

/* Delete this process entry from the list */

695

840

if(process_list == proc){

724

869

perror("print_out_password");

725

870

exitstatus = EXIT_FAILURE;

726

871

}

727

goto end;

872

goto fallback;

728

873

}

729

874

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

730

875

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

738

883

if (proc->buffer == NULL){

739

884

perror("malloc");

740

885

exitstatus = EXIT_FAILURE;

741

goto end;

886

goto fallback;

742

887

}

743

888

proc->buffer_size += BUFFER_SIZE;

744

889

}

759

904

}

760

905

761

906

762

end:

907

fallback:

763

908

764

909

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

765

910

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

770

915

if(not bret){

771

916

perror("print_out_password");

772

917

exitstatus = EXIT_FAILURE;

773

goto end;

774

918

}

775

919

}

776

920

777

921

/* Restore old signal handler */

778

sigaction(SIGCHLD, &old_sigchld_action, NULL);

779

780

free(custom_argv);

781

782

/* Free the plugin list */

783

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

784

next = plugin_list->next;

785

free(plugin_list->argv);

786

free(plugin_list);

787

}

922

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

923

if(ret == -1){

924

perror("sigaction");

925

exitstatus = EXIT_FAILURE;

926

}

927

928

if(custom_argv != NULL){

929

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

930

free(*arg);

931

}

932

free(custom_argv);

933

}

934

free_plugin_list(plugin_list);

788

935

789

936

if(dir != NULL){

790

937

closedir(dir);