/mandos/release : revision 24.1.83

56

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

57

argp_state, struct argp,

58

argp_parse(), ARGP_ERR_UNKNOWN,

59

ARGP_KEY_END, ARGP_KEY_ARG, error_t */

59

ARGP_KEY_END, ARGP_KEY_ARG,

60

error_t */

60

61

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

61

62

sigaddset(), sigaction(),

62

63

sigprocmask(), SIG_BLOCK, SIGCHLD,

64

65

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

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66

67

#define BUFFER_SIZE 256

67

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

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69

#define PDIR "/lib/mandos/plugins.d"

70

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

68

71

69

72

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

70

73

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

71

74

72

struct process;

73

74

typedef struct process{

75

pid_t pid;

76

int fd;

77

char *buffer;

78

size_t buffer_size;

79

size_t buffer_length;

80

bool eof;

81

bool completed;

82

int status;

83

struct process *next;

84

} process;

75

struct plugin;

85

76

86

77

typedef struct plugin{

87

78

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

90

81

char **environ;

91

82

int envc;

92

83

bool disabled;

84

85

/* Variables used for running processes*/

86

pid_t pid;

87

int fd;

88

char *buffer;

89

size_t buffer_size;

90

size_t buffer_length;

91

bool eof;

92

volatile bool completed;

93

volatile int status;

93

94

struct plugin *next;

94

95

} plugin;

95

96

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

97

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

97

static plugin *plugin_list = NULL;

98

99

/* Gets a existing plugin based on name,

100

or if none is found, creates a new one */

101

static plugin *getplugin(char *name){

102

/* Check for exiting plugin with that name */

103

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

98

104

if ((p->name == name)

99

105

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

100

106

return p;

105

111

if (new_plugin == NULL){

106

112

return NULL;

107

113

}

108

char *copy_name = strdup(name);

109

if(copy_name == NULL){

110

return NULL;

114

char *copy_name = NULL;

115

if(name != NULL){

116

copy_name = strdup(name);

117

if(copy_name == NULL){

118

return NULL;

119

}

111

120

}

112

121

113

122

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

114

123

.argc = 1,

115

.envc = 0,

116

124

.disabled = false,

117

.next = *plugin_list };

125

.next = plugin_list };

118

126

119

127

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

120

128

if (new_plugin->argv == NULL){

129

free(copy_name);

121

130

free(new_plugin);

122

131

return NULL;

123

132

}

124

133

new_plugin->argv[0] = copy_name;

125

134

new_plugin->argv[1] = NULL;

126

135

127

136

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

128

137

if(new_plugin->environ == NULL){

138

free(copy_name);

129

139

free(new_plugin->argv);

130

140

free(new_plugin);

131

141

return NULL;

132

142

}

133

143

new_plugin->environ[0] = NULL;

144

134

145

/* Append the new plugin to the list */

135

*plugin_list = new_plugin;

146

plugin_list = new_plugin;

136

147

return new_plugin;

137

148

}

138

149

168

179

}

169

180

170

181

/* Add to a plugin's environment */

171

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

182

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

172

183

if(p == NULL){

173

184

return false;

174

185

}

186

/* namelen = length of name of environment variable */

187

size_t namelen = (size_t)(strchrnul(def, '=') - def);

188

/* Search for this environment variable */

189

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

190

if(strncmp(*e, def, namelen+1) == 0){

191

/* It already exists */

192

if(replace){

193

char *new = realloc(*e, strlen(def));

194

if(new == NULL){

195

return false;

196

}

197

*e = new;

198

strcpy(*e, def);

199

}

200

return true;

201

}

202

}

175

203

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

176

204

}

177

205

178

179

206

/*

180

207

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

181

208

* Descriptor Flags".

192

219

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

193

220

}

194

221

195

process *process_list = NULL;

196

222

197

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

223

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

198

224

status. */

199

225

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

200

process *proc = process_list;

201

int status;

202

pid_t pid = wait(&status);

203

if(pid == -1){

204

perror("wait");

205

return;

206

}

207

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

208

proc = proc->next;

209

}

210

if(proc == NULL){

211

/* Process not found in process list */

212

return;

213

}

214

proc->status = status;

215

proc->completed = true;

226

while(true){

227

plugin *proc = plugin_list;

228

int status;

229

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

230

if(pid == 0){

231

/* Only still running child processes */

232

break;

233

}

234

if(pid == -1){

235

if (errno != ECHILD){

236

perror("waitpid");

237

}

238

/* No child processes */

239

break;

240

}

241

242

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

243

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

244

proc = proc->next;

245

}

246

if(proc == NULL){

247

/* Process not found in process list */

248

continue;

249

}

250

proc->status = status;

251

proc->completed = true;

252

}

216

253

}

217

254

255

/* Prints out a password to stdout */

218

256

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

219

257

ssize_t ret;

220

258

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

230

268

return true;

231

269

}

232

270

233

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

234

if (argv == NULL){

235

*argc = 1;

236

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

237

if(argv == NULL){

238

return NULL;

271

/* Removes and free a plugin from the plugin list */

272

static void free_plugin(plugin *plugin_node){

273

274

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

275

free(*arg);

276

}

277

free(plugin_node->argv);

278

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

279

free(*env);

280

}

281

free(plugin_node->environ);

282

free(plugin_node->buffer);

283

284

/* Removes the plugin from the singly-linked list */

285

if(plugin_node == plugin_list){

286

/* First one - simple */

287

plugin_list = plugin_list->next;

288

} else {

289

/* Second one or later */

290

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

291

if(p->next == plugin_node){

292

p->next = plugin_node->next;

293

break;

294

}

239

295

}

240

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

241

argv[1] = NULL;

242

}

243

*argc += 1;

244

argv = realloc(argv, sizeof(char *)

245

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

246

if(argv == NULL){

247

return NULL;

248

}

249

argv[*argc-1] = arg;

250

argv[*argc] = NULL;

251

return argv;

296

}

297

298

free(plugin_node);

252

299

}

253

300

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

}

301

static void free_plugin_list(void){

302

while(plugin_list != NULL){

303

free_plugin(plugin_list);

304

}

268

305

}

269

306

270

307

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

271

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

272

const char *argfile = ARGFILE;

308

char *plugindir = NULL;

309

char *argfile = NULL;

273

310

FILE *conffp;

274

311

size_t d_name_len;

275

312

DIR *dir = NULL;

298

335

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

299

336

if(ret == -1){

300

337

perror("sigaction");

301

exitstatus = EXIT_FAILURE;

338

exitstatus = EXIT_FAILURE;

302

339

goto fallback;

303

340

}

304

341

307

344

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

308

345

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

309

346

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

310

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

347

{ .name = "global-env", .key = 'G',

311

348

.arg = "VAR=value",

312

349

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

313

350

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

314

351

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

315

352

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

316

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

353

{ .name = "env-for", .key = 'E',

317

354

.arg = "PLUGIN:ENV=value",

318

355

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

319

356

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

320

357

.arg = "PLUGIN",

321

358

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

359

{ .name = "enable", .key = 'e',

360

.arg = "PLUGIN",

361

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

322

362

{ .name = "plugin-dir", .key = 128,

323

363

.arg = "DIRECTORY",

324

364

.doc = "Specify a different plugin directory", .group = 2 },

325

{ .name = "userid", .key = 129,

326

.arg = "ID", .flags = 0,

327

.doc = "User ID the plugins will run as", .group = 2 },

328

{ .name = "groupid", .key = 130,

329

.arg = "ID", .flags = 0,

330

.doc = "Group ID the plugins will run as", .group = 2 },

331

{ .name = "debug", .key = 131,

332

.doc = "Debug mode", .group = 3 },

365

{ .name = "config-file", .key = 129,

366

.arg = "FILE",

367

.doc = "Specify a different configuration file", .group = 2 },

368

{ .name = "userid", .key = 130,

369

.arg = "ID", .flags = 0,

370

.doc = "User ID the plugins will run as", .group = 3 },

371

{ .name = "groupid", .key = 131,

372

.arg = "ID", .flags = 0,

373

.doc = "Group ID the plugins will run as", .group = 3 },

374

{ .name = "debug", .key = 132,

375

.doc = "Debug mode", .group = 4 },

333

376

{ .name = NULL }

334

377

};

335

378

336

error_t parse_opt (int key, char *arg, struct argp_state *state) {

337

/* Get the INPUT argument from `argp_parse', which we know is a

338

pointer to our plugin list pointer. */

339

plugin **plugins = state->input;

379

error_t parse_opt (int key, char *arg, __attribute__((unused))

380

struct argp_state *state) {

340

381

switch (key) {

341

case 'g':

382

case 'g': /* --global-options */

342

383

if (arg != NULL){

343

384

char *p;

344

385

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

345

386

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

346

387

continue;

347

388

}

348

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

389

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

349

390

perror("add_argument");

350

391

return ARGP_ERR_UNKNOWN;

351

392

}

352

393

}

353

394

}

354

395

break;

355

case 'e':

396

case 'G': /* --global-env */

356

397

if(arg == NULL){

357

398

break;

358

399

}

361

402

if(envdef == NULL){

362

403

break;

363

404

}

364

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

405

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

365

406

perror("add_environment");

366

407

}

367

408

}

368

409

break;

369

case 'o':

410

case 'o': /* --options-for */

370

411

if (arg != NULL){

371

412

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

372

413

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

382

423

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

383

424

continue;

384

425

}

385

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

426

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

386

427

perror("add_argument");

387

428

return ARGP_ERR_UNKNOWN;

388

429

}

390

431

}

391

432

}

392

433

break;

393

case 'f':

434

case 'E': /* --env-for */

394

435

if(arg == NULL){

395

436

break;

396

437

}

404

445

break;

405

446

}

406

447

envdef++;

407

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

448

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

408

449

perror("add_environment");

409

450

}

410

451

}

411

452

break;

412

case 'd':

453

case 'd': /* --disable */

413

454

if (arg != NULL){

414

plugin *p = getplugin(arg, plugins);

455

plugin *p = getplugin(arg);

415

456

if(p == NULL){

416

457

return ARGP_ERR_UNKNOWN;

417

458

}

418

459

p->disabled = true;

419

460

}

420

461

break;

421

case 128:

422

plugindir = arg;

423

break;

424

case 129:

462

case 'e': /* --enable */

463

if (arg != NULL){

464

plugin *p = getplugin(arg);

465

if(p == NULL){

466

return ARGP_ERR_UNKNOWN;

467

}

468

p->disabled = false;

469

}

470

break;

471

case 128: /* --plugin-dir */

472

plugindir = strdup(arg);

473

if(plugindir == NULL){

474

perror("strdup");

475

}

476

break;

477

case 129: /* --config-file */

478

/* This is already done by parse_opt_config_file() */

479

break;

480

case 130: /* --userid */

425

481

uid = (uid_t)strtol(arg, NULL, 10);

426

482

break;

427

case 130:

483

case 131: /* --groupid */

428

484

gid = (gid_t)strtol(arg, NULL, 10);

429

485

break;

430

case 131:

486

case 132: /* --debug */

431

487

debug = true;

432

488

break;

433

489

case ARGP_KEY_ARG:

441

497

return 0;

442

498

}

443

499

444

plugin *plugin_list = NULL;

500

/* This option parser is the same as parse_opt() above, except it

501

ignores everything but the --config-file option. */

502

error_t parse_opt_config_file (int key, char *arg,

503

__attribute__((unused))

504

struct argp_state *state) {

505

switch (key) {

506

case 'g': /* --global-options */

507

case 'G': /* --global-env */

508

case 'o': /* --options-for */

509

case 'E': /* --env-for */

510

case 'd': /* --disable */

511

case 'e': /* --enable */

512

case 128: /* --plugin-dir */

513

break;

514

case 129: /* --config-file */

515

argfile = strdup(arg);

516

if(argfile == NULL){

517

perror("strdup");

518

}

519

break;

520

case 130: /* --userid */

521

case 131: /* --groupid */

522

case 132: /* --debug */

523

case ARGP_KEY_ARG:

524

case ARGP_KEY_END:

525

break;

526

default:

527

return ARGP_ERR_UNKNOWN;

528

}

529

return 0;

530

}

445

531

446

struct argp argp = { .options = options, .parser = parse_opt,

447

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

532

struct argp argp = { .options = options,

533

.parser = parse_opt_config_file,

534

.args_doc = "",

448

535

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

449

536

450

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

537

/* Parse using the parse_opt_config_file in order to get the custom

538

config file location, if any. */

539

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

451

540

if (ret == ARGP_ERR_UNKNOWN){

452

541

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

453

542

exitstatus = EXIT_FAILURE;

454

543

goto fallback;

455

544

}

456

457

conffp = fopen(argfile, "r");

545

546

/* Reset to the normal argument parser */

547

argp.parser = parse_opt;

548

549

/* Open the configfile if available */

550

if (argfile == NULL){

551

conffp = fopen(AFILE, "r");

552

} else {

553

conffp = fopen(argfile, "r");

554

}

458

555

if(conffp != NULL){

459

556

char *org_line = NULL;

460

557

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

463

560

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

464

561

const char comment_delim[] = "#";

465

562

563

custom_argc = 1;

564

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

565

if(custom_argv == NULL){

566

perror("malloc");

567

exitstatus = EXIT_FAILURE;

568

goto fallback;

569

}

570

custom_argv[0] = argv[0];

571

custom_argv[1] = NULL;

572

573

/* for each line in the config file, strip whitespace and ignore

574

commented text */

466

575

while(true){

467

576

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

468

577

if(sret == -1){

476

585

continue;

477

586

}

478

587

new_arg = strdup(p);

479

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

480

if (custom_argv == NULL){

481

perror("add_to_argv");

482

exitstatus = EXIT_FAILURE;

483

goto fallback;

484

}

588

if(new_arg == NULL){

589

perror("strdup");

590

exitstatus = EXIT_FAILURE;

591

free(org_line);

592

goto fallback;

593

}

594

595

custom_argc += 1;

596

custom_argv = realloc(custom_argv, sizeof(char *)

597

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

598

if(custom_argv == NULL){

599

perror("realloc");

600

exitstatus = EXIT_FAILURE;

601

free(org_line);

602

goto fallback;

603

}

604

custom_argv[custom_argc-1] = new_arg;

605

custom_argv[custom_argc] = NULL;

485

606

}

486

607

}

487

608

free(org_line);

488

} else{

609

} else {

489

610

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

490

611

not affect opening plugins */

491

612

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

494

615

goto fallback;

495

616

}

496

617

}

497

618

/* If there was any arguments from configuration file,

619

pass them to parser as command arguments */

498

620

if(custom_argv != NULL){

499

custom_argv[0] = argv[0];

500

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

621

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

622

0, NULL);

501

623

if (ret == ARGP_ERR_UNKNOWN){

502

624

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

503

625

exitstatus = EXIT_FAILURE;

505

627

}

506

628

}

507

629

630

/* Parse actual command line arguments, to let them override the

631

config file */

632

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

633

if (ret == ARGP_ERR_UNKNOWN){

634

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

635

exitstatus = EXIT_FAILURE;

636

goto fallback;

637

}

638

508

639

if(debug){

509

640

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

510

641

fprintf(stderr, "Plugin: %s has %d arguments\n",

519

650

}

520

651

}

521

652

653

/* Strip permissions down to nobody */

522

654

ret = setuid(uid);

523

655

if (ret == -1){

524

656

perror("setuid");

525

}

526

657

}

527

658

setgid(gid);

528

659

if (ret == -1){

529

660

perror("setgid");

530

661

}

531

662

532

dir = opendir(plugindir);

663

if (plugindir == NULL){

664

dir = opendir(PDIR);

665

} else {

666

dir = opendir(plugindir);

667

}

668

533

669

if(dir == NULL){

534

670

perror("Could not open plugin dir");

535

671

exitstatus = EXIT_FAILURE;

551

687

552

688

FD_ZERO(&rfds_all);

553

689

690

/* Read and execute any executable in the plugin directory*/

554

691

while(true){

555

692

dirst = readdir(dir);

556

693

557

// All directory entries have been processed

694

/* All directory entries have been processed */

558

695

if(dirst == NULL){

559

696

if (errno == EBADF){

560

697

perror("readdir");

566

703

567

704

d_name_len = strlen(dirst->d_name);

568

705

569

// Ignore dotfiles, backup files and other junk

706

/* Ignore dotfiles, backup files and other junk */

570

707

{

571

708

bool bad_name = false;

572

709

587

724

break;

588

725

}

589

726

}

590

591

727

if(bad_name){

592

728

continue;

593

729

}

594

595

730

for(const char **suf = bad_suffixes; *suf != NULL; suf++){

596

731

size_t suf_len = strlen(*suf);

597

732

if((d_name_len >= suf_len)

624

759

free(filename);

625

760

continue;

626

761

}

627

762

763

/* Ignore non-executable files */

628

764

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

629

765

if(debug){

630

766

fprintf(stderr, "Ignoring plugin dir entry \"%s\""

633

769

free(filename);

634

770

continue;

635

771

}

636

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

772

773

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

637

774

if(p == NULL){

638

775

perror("getplugin");

639

776

free(filename);

649

786

}

650

787

{

651

788

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

652

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

789

plugin *g = getplugin(NULL);

653

790

if(g != NULL){

654

791

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

655

792

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

658

795

}

659

796

/* Add global environment variables */

660

797

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

661

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

798

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

662

799

perror("add_environment");

663

800

}

664

801

}

669

806

process, too. */

670

807

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

671

808

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)){

809

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

678

810

perror("add_environment");

679

811

}

680

812

}

681

813

}

682

814

683

int pipefd[2];

815

int pipefd[2];

684

816

ret = pipe(pipefd);

685

817

if (ret == -1){

686

818

perror("pipe");

687

819

exitstatus = EXIT_FAILURE;

688

820

goto fallback;

689

821

}

822

/* Ask OS to automatic close the pipe on exec */

690

823

ret = set_cloexec_flag(pipefd[0]);

691

824

if(ret < 0){

692

825

perror("set_cloexec_flag");

706

839

exitstatus = EXIT_FAILURE;

707

840

goto fallback;

708

841

}

709

// Starting a new process to be watched

842

/* Starting a new process to be watched */

710

843

pid_t pid = fork();

711

844

if(pid == -1){

712

845

perror("fork");

750

883

}

751

884

/* no return */

752

885

}

753

/* parent process */

886

/* Parent process */

887

close(pipefd[1]); /* Close unused write end of pipe */

754

888

free(filename);

755

close(pipefd[1]); /* close unused write end of pipe */

756

process *new_process = malloc(sizeof(process));

757

if (new_process == NULL){

758

perror("malloc");

889

plugin *new_plugin = getplugin(dirst->d_name);

890

if (new_plugin == NULL){

891

perror("getplugin");

759

892

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

760

893

if(ret < 0){

761

perror("sigprocmask");

894

perror("sigprocmask");

762

895

}

763

896

exitstatus = EXIT_FAILURE;

764

897

goto fallback;

765

898

}

766

899

767

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

768

.fd = pipefd[0],

769

.next = process_list };

770

// List handling

771

process_list = new_process;

900

new_plugin->pid = pid;

901

new_plugin->fd = pipefd[0];

902

772

903

/* Unblock SIGCHLD so signal handler can be run if this process

773

904

has already completed */

774

905

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

778

909

goto fallback;

779

910

}

780

911

781

FD_SET(new_process->fd, &rfds_all);

912

FD_SET(new_plugin->fd, &rfds_all);

782

913

783

if (maxfd < new_process->fd){

784

maxfd = new_process->fd;

914

if (maxfd < new_plugin->fd){

915

maxfd = new_plugin->fd;

785

916

}

786

917

787

918

}

788

919

789

free_plugin_list(plugin_list);

790

791

920

closedir(dir);

792

921

dir = NULL;

793

794

if (process_list == NULL){

795

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

796

" directory?\n");

797

process_list = NULL;

922

923

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

924

if(p->pid != 0){

925

break;

926

}

927

if(p->next == NULL){

928

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

929

" directory?\n");

930

free_plugin_list();

931

}

798

932

}

799

while(process_list){

933

934

/* Main loop while running plugins exist */

935

while(plugin_list){

800

936

fd_set rfds = rfds_all;

801

937

int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);

802

938

if (select_ret == -1){

806

942

}

807

943

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

808

944

from one of them */

809

for(process *proc = process_list; proc ; proc = proc->next){

945

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

810

946

/* Is this process completely done? */

811

947

if(proc->eof and proc->completed){

812

948

/* Only accept the plugin output if it exited cleanly */

813

949

if(not WIFEXITED(proc->status)

814

950

or WEXITSTATUS(proc->status) != 0){

815

951

/* Bad exit by plugin */

952

816

953

if(debug){

817

954

if(WIFEXITED(proc->status)){

818

955

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

827

964

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

828

965

}

829

966

}

967

830

968

/* Remove the plugin */

831

969

FD_CLR(proc->fd, &rfds_all);

970

832

971

/* Block signal while modifying process_list */

833

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

972

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

834

973

if(ret < 0){

835

974

perror("sigprocmask");

836

975

exitstatus = EXIT_FAILURE;

837

976

goto fallback;

838

977

}

839

/* Delete this process entry from the list */

840

if(process_list == proc){

841

/* First one - simple */

842

process_list = proc->next;

843

} else {

844

/* Second one or later */

845

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

846

if(p->next == proc){

847

p->next = proc->next;

848

break;

849

}

850

}

851

}

978

free_plugin(proc);

852

979

/* We are done modifying process list, so unblock signal */

853

980

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

854

981

NULL);

855

982

if(ret < 0){

856

983

perror("sigprocmask");

857

}

858

free(proc->buffer);

859

free(proc);

860

/* We deleted this process from the list, so we can't go

861

proc->next. Therefore, start over from the beginning of

862

the process list */

863

break;

984

exitstatus = EXIT_FAILURE;

985

goto fallback;

986

}

987

988

if(plugin_list == NULL){

989

break;

990

}

991

continue;

864

992

}

993

865

994

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

866

995

867

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

996

bool bret = print_out_password(proc->buffer,

997

proc->buffer_length);

868

998

if(not bret){

869

999

perror("print_out_password");

870

1000

exitstatus = EXIT_FAILURE;

871

1001

}

872

1002

goto fallback;

873

1003

}

1004

874

1005

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

875

1006

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

876

1007

/* This process had nothing to say at this time */

906

1037

907

1038

fallback:

908

1039

909

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

910

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

1040

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

1041

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

1042

occured */

911

1043

bool bret;

912

1044

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

913

1045

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

926

1058

}

927

1059

928

1060

if(custom_argv != NULL){

929

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

1061

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

930

1062

free(*arg);

931

1063

}

932

1064

free(custom_argv);

933

1065

}

934

free_plugin_list(plugin_list);

935

1066

936

1067

if(dir != NULL){

937

1068

closedir(dir);

938

1069

}

939

1070

940

1071

/* Free the process list and kill the processes */

941

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

942

next = process_list->next;

943

close(process_list->fd);

944

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

945

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

946

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

947

perror("kill");

1072

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

1073

if(p->pid != 0){

1074

close(p->fd);

1075

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

1076

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

1077

/* Set-uid proccesses might not get closed */

1078

perror("kill");

1079

}

948

1080

}

949

free(process_list->buffer);

950

free(process_list);

951

1081

}

952

1082

953

1083

/* Wait for any remaining child processes to terminate */

957

1087

if(errno != ECHILD){

958

1088

perror("wait");

959

1089

}

1090

1091

free_plugin_list();

1092

1093

free(plugindir);

1094

free(argfile);

960

1095

961

1096

return exitstatus;

962

1097

}