/mandos/release : revision 24.1.55

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

57

argp_state, struct argp,

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argp_parse(), ARGP_ERR_UNKNOWN,

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ARGP_KEY_END, ARGP_KEY_ARG,

60

error_t */

59

ARGP_KEY_END, ARGP_KEY_ARG, error_t */

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

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61

sigaddset(), sigaction(),

63

62

sigprocmask(), SIG_BLOCK, SIGCHLD,

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64

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

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65

67

66

#define BUFFER_SIZE 256

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69

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

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

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

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68

72

69

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

73

70

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

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71

75

struct plugin;

72

struct process;

73

74

typedef struct process{

75

pid_t pid;

76

int fd;

77

char *buffer;

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size_t buffer_size;

79

size_t buffer_length;

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bool eof;

81

bool completed;

82

int status;

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struct process *next;

84

} process;

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85

77

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typedef struct plugin{

78

87

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

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90

char **environ;

82

91

int envc;

83

92

bool disabled;

84

85

/* Variables used for running processes*/

86

pid_t pid;

87

int fd;

88

char *buffer;

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size_t buffer_size;

90

size_t buffer_length;

91

bool eof;

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volatile bool completed;

93

volatile int status;

94

93

struct plugin *next;

95

94

} plugin;

96

95

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){

96

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

97

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

104

98

if ((p->name == name)

105

99

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

106

100

return p;

111

105

if (new_plugin == NULL){

112

106

return NULL;

113

107

}

114

char *copy_name = NULL;

115

if(name != NULL){

116

copy_name = strdup(name);

117

if(copy_name == NULL){

118

return NULL;

119

}

108

char *copy_name = strdup(name);

109

if(copy_name == NULL){

110

return NULL;

120

111

}

121

112

122

113

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

123

114

.argc = 1,

115

.envc = 0,

124

116

.disabled = false,

125

.next = plugin_list };

117

.next = *plugin_list };

126

118

127

119

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

128

120

if (new_plugin->argv == NULL){

129

free(copy_name);

130

121

free(new_plugin);

131

122

return NULL;

132

123

}

133

124

new_plugin->argv[0] = copy_name;

134

125

new_plugin->argv[1] = NULL;

135

126

136

127

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

137

128

if(new_plugin->environ == NULL){

138

free(copy_name);

139

129

free(new_plugin->argv);

140

130

free(new_plugin);

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131

return NULL;

142

132

}

143

133

new_plugin->environ[0] = NULL;

144

145

134

/* Append the new plugin to the list */

146

plugin_list = new_plugin;

135

*plugin_list = new_plugin;

147

136

return new_plugin;

148

137

}

149

138

179

168

}

180

169

181

170

/* Add to a plugin's environment */

182

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

171

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

183

172

if(p == NULL){

184

173

return false;

185

174

}

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

}

203

175

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

204

176

}

205

177

178

206

179

/*

207

180

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

208

181

* Descriptor Flags".

219

192

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

220

193

}

221

194

195

process *process_list = NULL;

222

196

223

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

197

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

224

198

status. */

225

199

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

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

}

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;

253

216

}

254

217

255

/* Prints out a password to stdout */

256

218

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

257

219

ssize_t ret;

258

220

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

268

230

return true;

269

231

}

270

232

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

}

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;

295

239

}

296

}

297

298

free(plugin_node);

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;

299

252

}

300

253

301

static void free_plugin_list(void){

302

while(plugin_list != NULL){

303

free_plugin(plugin_list);

304

}

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

}

305

268

}

306

269

307

270

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

308

char *plugindir = NULL;

309

char *argfile = NULL;

271

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

272

const char *argfile = ARGFILE;

310

273

FILE *conffp;

311

274

size_t d_name_len;

312

275

DIR *dir = NULL;

335

298

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

336

299

if(ret == -1){

337

300

perror("sigaction");

338

exitstatus = EXIT_FAILURE;

301

exitstatus = EXIT_FAILURE;

339

302

goto fallback;

340

303

}

341

304

344

307

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

345

308

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

346

309

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

347

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

310

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

348

311

.arg = "VAR=value",

349

312

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

350

313

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

351

314

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

352

315

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

353

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

316

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

354

317

.arg = "PLUGIN:ENV=value",

355

318

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

356

319

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

357

320

.arg = "PLUGIN",

358

321

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

359

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

360

.arg = "PLUGIN",

361

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

362

322

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

363

323

.arg = "DIRECTORY",

364

324

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

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 },

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 },

376

333

{ .name = NULL }

377

334

};

378

335

379

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

380

struct argp_state *state) {

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;

381

340

switch (key) {

382

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

341

case 'g':

383

342

if (arg != NULL){

384

343

char *p;

385

344

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

386

345

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

387

346

continue;

388

347

}

389

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

348

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

390

349

perror("add_argument");

391

350

return ARGP_ERR_UNKNOWN;

392

351

}

393

352

}

394

353

}

395

354

break;

396

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

355

case 'e':

397

356

if(arg == NULL){

398

357

break;

399

358

}

402

361

if(envdef == NULL){

403

362

break;

404

363

}

405

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

364

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

406

365

perror("add_environment");

407

366

}

408

367

}

409

368

break;

410

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

369

case 'o':

411

370

if (arg != NULL){

412

371

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

413

372

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

423

382

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

424

383

continue;

425

384

}

426

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

385

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

427

386

perror("add_argument");

428

387

return ARGP_ERR_UNKNOWN;

429

388

}

431

390

}

432

391

}

433

392

break;

434

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

393

case 'f':

435

394

if(arg == NULL){

436

395

break;

437

396

}

445

404

break;

446

405

}

447

406

envdef++;

448

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

407

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

449

408

perror("add_environment");

450

409

}

451

410

}

452

411

break;

453

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

412

case 'd':

454

413

if (arg != NULL){

455

plugin *p = getplugin(arg);

414

plugin *p = getplugin(arg, plugins);

456

415

if(p == NULL){

457

416

return ARGP_ERR_UNKNOWN;

458

417

}

459

418

p->disabled = true;

460

419

}

461

420

break;

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 */

421

case 128:

422

plugindir = arg;

423

break;

424

case 129:

481

425

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

482

426

break;

483

case 131: /* --groupid */

427

case 130:

484

428

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

485

429

break;

486

case 132: /* --debug */

430

case 131:

487

431

debug = true;

488

432

break;

489

433

case ARGP_KEY_ARG:

497

441

return 0;

498

442

}

499

443

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

}

444

plugin *plugin_list = NULL;

531

445

532

struct argp argp = { .options = options,

533

.parser = parse_opt_config_file,

534

.args_doc = "",

446

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

447

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

535

448

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

536

449

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);

450

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

540

451

if (ret == ARGP_ERR_UNKNOWN){

541

452

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

542

453

exitstatus = EXIT_FAILURE;

543

454

goto fallback;

544

455

}

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

}

456

457

conffp = fopen(argfile, "r");

555

458

if(conffp != NULL){

556

459

char *org_line = NULL;

557

460

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

560

463

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

561

464

const char comment_delim[] = "#";

562

465

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 */

575

466

while(true){

576

467

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

577

468

if(sret == -1){

585

476

continue;

586

477

}

587

478

new_arg = strdup(p);

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;

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

}

606

485

}

607

486

}

608

487

free(org_line);

609

} else {

488

} else{

610

489

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

611

490

not affect opening plugins */

612

491

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

615

494

goto fallback;

616

495

}

617

496

}

618

/* If there was any arguments from configuration file,

619

pass them to parser as command arguments */

497

620

498

if(custom_argv != NULL){

621

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

622

0, NULL);

499

custom_argv[0] = argv[0];

500

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

623

501

if (ret == ARGP_ERR_UNKNOWN){

624

502

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

625

503

exitstatus = EXIT_FAILURE;

627

505

}

628

506

}

629

507

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

639

508

if(debug){

640

509

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

641

510

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

650

519

}

651

520

}

652

521

653

/* Strip permissions down to nobody */

654

522

ret = setuid(uid);

655

523

if (ret == -1){

656

524

perror("setuid");

657

}

525

}

526

658

527

setgid(gid);

659

528

if (ret == -1){

660

529

perror("setgid");

661

530

}

662

531

663

if (plugindir == NULL){

664

dir = opendir(PDIR);

665

} else {

666

dir = opendir(plugindir);

667

}

668

532

dir = opendir(plugindir);

669

533

if(dir == NULL){

670

534

perror("Could not open plugin dir");

671

535

exitstatus = EXIT_FAILURE;

687

551

688

552

FD_ZERO(&rfds_all);

689

553

690

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

691

554

while(true){

692

555

dirst = readdir(dir);

693

556

694

/* All directory entries have been processed */

557

// All directory entries have been processed

695

558

if(dirst == NULL){

696

559

if (errno == EBADF){

697

560

perror("readdir");

703

566

704

567

d_name_len = strlen(dirst->d_name);

705

568

706

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

569

// Ignore dotfiles, backup files and other junk

707

570

{

708

571

bool bad_name = false;

709

572

724

587

break;

725

588

}

726

589

}

590

727

591

if(bad_name){

728

592

continue;

729

593

}

594

730

595

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

731

596

size_t suf_len = strlen(*suf);

732

597

if((d_name_len >= suf_len)

759

624

free(filename);

760

625

continue;

761

626

}

762

763

/* Ignore non-executable files */

627

764

628

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

765

629

if(debug){

766

630

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

769

633

free(filename);

770

634

continue;

771

635

}

772

773

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

636

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

774

637

if(p == NULL){

775

638

perror("getplugin");

776

639

free(filename);

786

649

}

787

650

{

788

651

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

789

plugin *g = getplugin(NULL);

652

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

790

653

if(g != NULL){

791

654

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

792

655

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

795

658

}

796

659

/* Add global environment variables */

797

660

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

798

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

661

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

799

662

perror("add_environment");

800

663

}

801

664

}

806

669

process, too. */

807

670

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

808

671

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

809

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

672

char *copy = strdup(*e);

673

if(copy == NULL){

674

perror("strdup");

675

continue;

676

}

677

if(not add_environment(p, copy)){

810

678

perror("add_environment");

811

679

}

812

680

}

813

681

}

814

682

815

int pipefd[2];

683

int pipefd[2];

816

684

ret = pipe(pipefd);

817

685

if (ret == -1){

818

686

perror("pipe");

819

687

exitstatus = EXIT_FAILURE;

820

688

goto fallback;

821

689

}

822

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

823

690

ret = set_cloexec_flag(pipefd[0]);

824

691

if(ret < 0){

825

692

perror("set_cloexec_flag");

839

706

exitstatus = EXIT_FAILURE;

840

707

goto fallback;

841

708

}

842

/* Starting a new process to be watched */

709

// Starting a new process to be watched

843

710

pid_t pid = fork();

844

711

if(pid == -1){

845

712

perror("fork");

883

750

}

884

751

/* no return */

885

752

}

886

/* Parent process */

887

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

753

/* parent process */

888

754

free(filename);

889

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

890

if (new_plugin == NULL){

891

perror("getplugin");

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");

892

759

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

893

760

if(ret < 0){

894

perror("sigprocmask");

761

perror("sigprocmask");

895

762

}

896

763

exitstatus = EXIT_FAILURE;

897

764

goto fallback;

898

765

}

899

766

900

new_plugin->pid = pid;

901

new_plugin->fd = pipefd[0];

902

767

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

768

.fd = pipefd[0],

769

.next = process_list };

770

// List handling

771

process_list = new_process;

903

772

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

904

773

has already completed */

905

774

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

909

778

goto fallback;

910

779

}

911

780

912

FD_SET(new_plugin->fd, &rfds_all);

781

FD_SET(new_process->fd, &rfds_all);

913

782

914

if (maxfd < new_plugin->fd){

915

maxfd = new_plugin->fd;

783

if (maxfd < new_process->fd){

784

maxfd = new_process->fd;

916

785

}

917

786

918

787

}

919

788

789

free_plugin_list(plugin_list);

790

920

791

closedir(dir);

921

792

dir = 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

}

793

794

if (process_list == NULL){

795

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

796

" directory?\n");

797

process_list = NULL;

932

798

}

933

934

/* Main loop while running plugins exist */

935

while(plugin_list){

799

while(process_list){

936

800

fd_set rfds = rfds_all;

937

801

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

938

802

if (select_ret == -1){

942

806

}

943

807

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

944

808

from one of them */

945

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

809

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

946

810

/* Is this process completely done? */

947

811

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

948

812

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

949

813

if(not WIFEXITED(proc->status)

950

814

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

951

815

/* Bad exit by plugin */

952

953

816

if(debug){

954

817

if(WIFEXITED(proc->status)){

955

818

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

964

827

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

965

828

}

966

829

}

967

968

830

/* Remove the plugin */

969

831

FD_CLR(proc->fd, &rfds_all);

970

971

832

/* Block signal while modifying process_list */

972

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

833

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

973

834

if(ret < 0){

974

835

perror("sigprocmask");

975

836

exitstatus = EXIT_FAILURE;

976

837

goto fallback;

977

838

}

978

free_plugin(proc);

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

}

979

852

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

980

853

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

981

854

NULL);

982

855

if(ret < 0){

983

856

perror("sigprocmask");

984

exitstatus = EXIT_FAILURE;

985

goto fallback;

986

}

987

988

if(plugin_list == NULL){

989

break;

990

}

991

continue;

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;

992

864

}

993

994

865

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

995

866

996

bool bret = print_out_password(proc->buffer,

997

proc->buffer_length);

867

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

998

868

if(not bret){

999

869

perror("print_out_password");

1000

870

exitstatus = EXIT_FAILURE;

1001

871

}

1002

872

goto fallback;

1003

873

}

1004

1005

874

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

1006

875

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

1007

876

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

1037

906

1038

907

fallback:

1039

908

1040

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

1041

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

1042

occured */

909

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

910

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

1043

911

bool bret;

1044

912

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

1045

913

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

1058

926

}

1059

927

1060

928

if(custom_argv != NULL){

1061

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

929

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

1062

930

free(*arg);

1063

931

}

1064

932

free(custom_argv);

1065

933

}

934

free_plugin_list(plugin_list);

1066

935

1067

936

if(dir != NULL){

1068

937

closedir(dir);

1069

938

}

1070

939

1071

940

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

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

}

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");

1080

948

}

949

free(process_list->buffer);

950

free(process_list);

1081

951

}

1082

952

1083

953

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

1087

957

if(errno != ECHILD){

1088

958

perror("wait");

1089

959

}

1090

1091

free_plugin_list();

1092

1093

free(plugindir);

1094

free(argfile);

1095

960

1096

961

return exitstatus;

1097

962

}