/mandos/release : revision 24.1.65

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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,

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error_t */

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ARGP_KEY_END, ARGP_KEY_ARG, error_t */

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

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sigaddset(), sigaction(),

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sigprocmask(), SIG_BLOCK, SIGCHLD,

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64

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

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65

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

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

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71

75

struct plugin;

72

struct process;

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74

typedef struct process{

75

pid_t pid;

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int fd;

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char *buffer;

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size_t buffer_size;

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size_t buffer_length;

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bool eof;

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bool completed;

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int status;

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struct process *next;

84

} process;

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85

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typedef struct plugin{

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

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90

char **environ;

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91

int envc;

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92

bool disabled;

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/* Variables used for running processes*/

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pid_t pid;

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int fd;

88

char *buffer;

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size_t buffer_size;

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size_t buffer_length;

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bool eof;

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volatile bool completed;

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volatile int status;

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struct plugin *next;

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94

} plugin;

96

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97

static plugin *plugin_list = NULL;

98

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/* Gets an 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;

121

115

122

116

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

123

117

.argc = 1,

118

.envc = 0,

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119

.disabled = false,

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.next = plugin_list };

120

.next = *plugin_list };

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121

127

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

128

123

if (new_plugin->argv == NULL){

132

127

}

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128

new_plugin->argv[0] = copy_name;

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129

new_plugin->argv[1] = NULL;

135

130

136

131

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

137

132

if(new_plugin->environ == NULL){

138

133

free(copy_name);

141

136

return NULL;

142

137

}

143

138

new_plugin->environ[0] = NULL;

144

145

139

/* Append the new plugin to the list */

146

plugin_list = new_plugin;

140

*plugin_list = new_plugin;

147

141

return new_plugin;

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142

}

149

143

179

173

}

180

174

181

175

/* Add to a plugin's environment */

182

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

176

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

183

177

if(p == NULL){

184

178

return false;

185

179

}

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) + 1);

194

if(new == NULL){

195

return false;

196

}

197

*e = new;

198

strcpy(*e, def);

199

}

200

return true;

201

}

202

}

203

180

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

204

181

}

205

182

183

206

184

/*

207

185

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

208

186

* Descriptor Flags".

219

197

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

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198

}

221

199

200

process *process_list = NULL;

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201

223

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

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

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203

status. */

225

204

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

205

process *proc = process_list;

226

206

while(true){

227

plugin *proc = plugin_list;

228

207

int status;

229

208

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

230

209

if(pid == 0){

231

/* Only still running child processes */

232

210

break;

233

211

}

234

212

if(pid == -1){

235

213

if (errno != ECHILD){

236

214

perror("waitpid");

237

215

}

238

/* No child processes */

239

break;

216

return;

240

217

}

241

242

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

218

243

219

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

244

220

proc = proc->next;

245

221

}

252

228

}

253

229

}

254

230

255

/* Prints out a password to stdout */

256

231

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

257

232

ssize_t ret;

233

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

234

length--;

235

}

258

236

for(size_t written = 0; written < length; written += (size_t)ret){

259

237

ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,

260

238

length - written));

265

243

return true;

266

244

}

267

245

268

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

269

static void free_plugin(plugin *plugin_node){

270

271

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

272

free(*arg);

273

}

274

free(plugin_node->argv);

275

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

276

free(*env);

277

}

278

free(plugin_node->environ);

279

free(plugin_node->buffer);

280

281

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

282

if(plugin_node == plugin_list){

283

/* First one - simple */

284

plugin_list = plugin_list->next;

285

} else {

286

/* Second one or later */

287

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

288

if(p->next == plugin_node){

289

p->next = plugin_node->next;

290

break;

291

}

246

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

247

if (argv == NULL){

248

*argc = 1;

249

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

250

if(argv == NULL){

251

return NULL;

292

252

}

293

}

294

295

free(plugin_node);

253

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

254

argv[1] = NULL;

255

}

256

*argc += 1;

257

argv = realloc(argv, sizeof(char *)

258

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

259

if(argv == NULL){

260

return NULL;

261

}

262

argv[*argc-1] = arg;

263

argv[*argc] = NULL;

264

return argv;

296

265

}

297

266

298

static void free_plugin_list(void){

299

while(plugin_list != NULL){

300

free_plugin(plugin_list);

267

static void free_plugin_list(plugin *plugin_list){

268

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

269

next = plugin_list->next;

270

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

271

free(*arg);

272

}

273

free(plugin_list->argv);

274

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

275

free(*env);

276

}

277

free(plugin_list->environ);

278

free(plugin_list);

301

279

}

302

280

}

303

281

304

282

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

305

char *plugindir = NULL;

306

char *argfile = NULL;

283

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

284

const char *argfile = ARGFILE;

307

285

FILE *conffp;

308

286

size_t d_name_len;

309

287

DIR *dir = NULL;

341

319

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

342

320

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

343

321

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

344

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

322

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

345

323

.arg = "VAR=value",

346

324

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

347

325

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

348

326

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

349

327

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

350

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

328

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

351

329

.arg = "PLUGIN:ENV=value",

352

330

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

353

331

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

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332

.arg = "PLUGIN",

355

333

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

356

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

357

.arg = "PLUGIN",

358

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

359

334

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

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335

.arg = "DIRECTORY",

361

336

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

362

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

363

.arg = "FILE",

364

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

365

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

366

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

367

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

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

369

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

370

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

371

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

372

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

337

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

338

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

339

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

340

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

341

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

342

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

343

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

344

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

373

345

{ .name = NULL }

374

346

};

375

347

376

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

377

struct argp_state *state) {

348

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

349

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

350

pointer to our plugin list pointer. */

351

plugin **plugins = state->input;

378

352

switch (key) {

379

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

353

case 'g':

380

354

if (arg != NULL){

381

355

char *p;

382

356

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

383

357

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

384

358

continue;

385

359

}

386

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

360

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

387

361

perror("add_argument");

388

362

return ARGP_ERR_UNKNOWN;

389

363

}

390

364

}

391

365

}

392

366

break;

393

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

367

case 'e':

394

368

if(arg == NULL){

395

369

break;

396

370

}

399

373

if(envdef == NULL){

400

374

break;

401

375

}

402

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

376

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

403

377

perror("add_environment");

404

378

}

405

379

}

406

380

break;

407

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

381

case 'o':

408

382

if (arg != NULL){

409

383

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

410

if(p_name[0] == '\0' or arg == NULL){

384

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

411

385

break;

412

386

}

413

387

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

414

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

388

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

415

389

break;

416

390

}

417

char *p;

418

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

419

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

420

continue;

421

}

422

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

423

perror("add_argument");

424

return ARGP_ERR_UNKNOWN;

391

if(opt != NULL){

392

char *p;

393

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

394

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

395

continue;

396

}

397

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

398

perror("add_argument");

399

return ARGP_ERR_UNKNOWN;

400

}

425

401

}

426

402

}

427

403

}

428

404

break;

429

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

405

case 'f':

430

406

if(arg == NULL){

431

407

break;

432

408

}

440

416

break;

441

417

}

442

418

envdef++;

443

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

419

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

444

420

perror("add_environment");

445

421

}

446

422

}

447

423

break;

448

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

424

case 'd':

449

425

if (arg != NULL){

450

plugin *p = getplugin(arg);

426

plugin *p = getplugin(arg, plugins);

451

427

if(p == NULL){

452

428

return ARGP_ERR_UNKNOWN;

453

429

}

454

430

p->disabled = true;

455

431

}

456

432

break;

457

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

458

if (arg != NULL){

459

plugin *p = getplugin(arg);

460

if(p == NULL){

461

return ARGP_ERR_UNKNOWN;

462

}

463

p->disabled = false;

464

}

465

break;

466

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

467

plugindir = strdup(arg);

468

if(plugindir == NULL){

469

perror("strdup");

470

}

471

break;

472

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

473

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

474

break;

475

case 130: /* --userid */

433

case 128:

434

plugindir = arg;

435

break;

436

case 129:

476

437

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

477

438

break;

478

case 131: /* --groupid */

439

case 130:

479

440

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

480

441

break;

481

case 132: /* --debug */

442

case 131:

482

443

debug = true;

483

444

break;

484

445

case ARGP_KEY_ARG:

492

453

return 0;

493

454

}

494

455

495

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

496

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

497

error_t parse_opt_config_file (int key, char *arg,

498

__attribute__((unused))

499

struct argp_state *state) {

500

switch (key) {

501

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

502

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

503

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

504

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

505

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

506

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

507

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

508

break;

509

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

510

argfile = strdup(arg);

511

if(argfile == NULL){

512

perror("strdup");

513

}

514

break;

515

case 130: /* --userid */

516

case 131: /* --groupid */

517

case 132: /* --debug */

518

case ARGP_KEY_ARG:

519

case ARGP_KEY_END:

520

break;

521

default:

522

return ARGP_ERR_UNKNOWN;

523

}

524

return 0;

525

}

456

plugin *plugin_list = NULL;

526

457

527

struct argp argp = { .options = options,

528

.parser = parse_opt_config_file,

529

.args_doc = "",

458

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

459

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

530

460

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

531

461

532

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

533

config file location, if any. */

534

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

462

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

535

463

if (ret == ARGP_ERR_UNKNOWN){

536

464

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

537

465

exitstatus = EXIT_FAILURE;

538

466

goto fallback;

539

467

}

540

541

/* Reset to the normal argument parser */

542

argp.parser = parse_opt;

543

544

/* Open the configfile if available */

545

if (argfile == NULL){

546

conffp = fopen(AFILE, "r");

547

} else {

548

conffp = fopen(argfile, "r");

549

}

468

469

conffp = fopen(argfile, "r");

550

470

if(conffp != NULL){

551

471

char *org_line = NULL;

552

472

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

555

475

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

556

476

const char comment_delim[] = "#";

557

477

558

custom_argc = 1;

559

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

560

if(custom_argv == NULL){

561

perror("malloc");

562

exitstatus = EXIT_FAILURE;

563

goto fallback;

564

}

565

custom_argv[0] = argv[0];

566

custom_argv[1] = NULL;

567

568

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

569

commented text */

570

478

while(true){

571

479

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

572

480

if(sret == -1){

580

488

continue;

581

489

}

582

490

new_arg = strdup(p);

583

if(new_arg == NULL){

584

perror("strdup");

585

exitstatus = EXIT_FAILURE;

586

free(org_line);

587

goto fallback;

588

}

589

590

custom_argc += 1;

591

custom_argv = realloc(custom_argv, sizeof(char *)

592

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

593

if(custom_argv == NULL){

594

perror("realloc");

595

exitstatus = EXIT_FAILURE;

596

free(org_line);

597

goto fallback;

598

}

599

custom_argv[custom_argc-1] = new_arg;

600

custom_argv[custom_argc] = NULL;

491

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

492

if (custom_argv == NULL){

493

perror("add_to_argv");

494

exitstatus = EXIT_FAILURE;

495

goto fallback;

496

}

601

497

}

602

498

}

603

499

free(org_line);

604

} else {

500

} else{

605

501

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

606

502

not affect opening plugins */

607

503

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

610

506

goto fallback;

611

507

}

612

508

}

613

/* If there was any arguments from configuration file,

614

pass them to parser as command arguments */

509

615

510

if(custom_argv != NULL){

616

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

617

0, NULL);

511

custom_argv[0] = argv[0];

512

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

618

513

if (ret == ARGP_ERR_UNKNOWN){

619

514

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

620

515

exitstatus = EXIT_FAILURE;

622

517

}

623

518

}

624

519

625

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

626

config file */

627

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

628

if (ret == ARGP_ERR_UNKNOWN){

629

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

630

exitstatus = EXIT_FAILURE;

631

goto fallback;

632

}

633

634

520

if(debug){

635

521

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

636

522

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

645

531

}

646

532

}

647

533

648

/* Strip permissions down to nobody */

649

534

ret = setuid(uid);

650

535

if (ret == -1){

651

536

perror("setuid");

652

}

537

}

538

653

539

setgid(gid);

654

540

if (ret == -1){

655

541

perror("setgid");

656

542

}

657

543

658

if (plugindir == NULL){

659

dir = opendir(PDIR);

660

} else {

661

dir = opendir(plugindir);

662

}

663

544

dir = opendir(plugindir);

664

545

if(dir == NULL){

665

546

perror("Could not open plugin dir");

666

547

exitstatus = EXIT_FAILURE;

682

563

683

564

FD_ZERO(&rfds_all);

684

565

685

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

686

566

while(true){

687

567

dirst = readdir(dir);

688

568

689

/* All directory entries have been processed */

569

// All directory entries have been processed

690

570

if(dirst == NULL){

691

571

if (errno == EBADF){

692

572

perror("readdir");

698

578

699

579

d_name_len = strlen(dirst->d_name);

700

580

701

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

581

// Ignore dotfiles, backup files and other junk

702

582

{

703

583

bool bad_name = false;

704

584

719

599

break;

720

600

}

721

601

}

602

722

603

if(bad_name){

723

604

continue;

724

605

}

606

725

607

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

726

608

size_t suf_len = strlen(*suf);

727

609

if((d_name_len >= suf_len)

742

624

}

743

625

744

626

char *filename;

745

if(plugindir == NULL){

746

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

747

} else {

748

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

749

}

627

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

750

628

if(ret < 0){

751

629

perror("asprintf");

752

630

continue;

758

636

free(filename);

759

637

continue;

760

638

}

761

762

/* Ignore non-executable files */

639

763

640

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

764

641

if(debug){

765

642

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

768

645

free(filename);

769

646

continue;

770

647

}

771

772

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

648

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

773

649

if(p == NULL){

774

650

perror("getplugin");

775

651

free(filename);

785

661

}

786

662

{

787

663

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

788

plugin *g = getplugin(NULL);

664

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

789

665

if(g != NULL){

790

666

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

791

667

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

794

670

}

795

671

/* Add global environment variables */

796

672

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

797

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

673

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

798

674

perror("add_environment");

799

675

}

800

676

}

805

681

process, too. */

806

682

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

807

683

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

808

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

684

char *copy = strdup(*e);

685

if(copy == NULL){

686

perror("strdup");

687

continue;

688

}

689

if(not add_environment(p, copy)){

809

690

perror("add_environment");

810

691

}

811

692

}

818

699

exitstatus = EXIT_FAILURE;

819

700

goto fallback;

820

701

}

821

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

822

702

ret = set_cloexec_flag(pipefd[0]);

823

703

if(ret < 0){

824

704

perror("set_cloexec_flag");

838

718

exitstatus = EXIT_FAILURE;

839

719

goto fallback;

840

720

}

841

/* Starting a new process to be watched */

721

// Starting a new process to be watched

842

722

pid_t pid = fork();

843

723

if(pid == -1){

844

724

perror("fork");

882

762

}

883

763

/* no return */

884

764

}

885

/* Parent process */

886

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

765

/* parent process */

887

766

free(filename);

888

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

889

if (new_plugin == NULL){

890

perror("getplugin");

767

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

768

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

769

if (new_process == NULL){

770

perror("malloc");

891

771

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

892

772

if(ret < 0){

893

perror("sigprocmask");

773

perror("sigprocmask");

894

774

}

895

775

exitstatus = EXIT_FAILURE;

896

776

goto fallback;

897

777

}

898

778

899

new_plugin->pid = pid;

900

new_plugin->fd = pipefd[0];

901

779

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

780

.fd = pipefd[0],

781

.next = process_list };

782

// List handling

783

process_list = new_process;

902

784

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

903

785

has already completed */

904

786

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

908

790

goto fallback;

909

791

}

910

792

911

FD_SET(new_plugin->fd, &rfds_all);

793

FD_SET(new_process->fd, &rfds_all);

912

794

913

if (maxfd < new_plugin->fd){

914

maxfd = new_plugin->fd;

795

if (maxfd < new_process->fd){

796

maxfd = new_process->fd;

915

797

}

916

798

917

799

}

918

800

801

free_plugin_list(plugin_list);

802

plugin_list = NULL;

803

919

804

closedir(dir);

920

805

dir = NULL;

921

922

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

923

if(p->pid != 0){

924

break;

925

}

926

if(p->next == NULL){

927

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

928

" directory?\n");

929

free_plugin_list();

930

}

806

807

if (process_list == NULL){

808

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

809

" directory?\n");

810

process_list = NULL;

931

811

}

932

933

/* Main loop while running plugins exist */

934

while(plugin_list){

812

while(process_list){

935

813

fd_set rfds = rfds_all;

936

814

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

937

815

if (select_ret == -1){

941

819

}

942

820

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

943

821

from one of them */

944

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

822

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

945

823

/* Is this process completely done? */

946

824

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

947

825

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

948

826

if(not WIFEXITED(proc->status)

949

827

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

950

828

/* Bad exit by plugin */

951

952

829

if(debug){

953

830

if(WIFEXITED(proc->status)){

954

831

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

963

840

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

964

841

}

965

842

}

966

967

843

/* Remove the plugin */

968

844

FD_CLR(proc->fd, &rfds_all);

969

970

845

/* Block signal while modifying process_list */

971

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

846

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

972

847

if(ret < 0){

973

848

perror("sigprocmask");

974

849

exitstatus = EXIT_FAILURE;

975

850

goto fallback;

976

851

}

977

free_plugin(proc);

852

/* Delete this process entry from the list */

853

if(process_list == proc){

854

/* First one - simple */

855

process_list = proc->next;

856

} else {

857

/* Second one or later */

858

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

859

if(p->next == proc){

860

p->next = proc->next;

861

break;

862

}

863

}

864

}

978

865

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

979

866

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

980

867

NULL);

981

868

if(ret < 0){

982

869

perror("sigprocmask");

983

exitstatus = EXIT_FAILURE;

984

goto fallback;

985

}

986

987

if(plugin_list == NULL){

988

break;

989

}

990

continue;

870

}

871

free(proc->buffer);

872

free(proc);

873

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

874

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

875

the process list */

876

break;

991

877

}

992

993

878

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

994

879

995

bool bret = print_out_password(proc->buffer,

996

proc->buffer_length);

880

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

997

881

if(not bret){

998

882

perror("print_out_password");

999

883

exitstatus = EXIT_FAILURE;

1000

884

}

1001

885

goto fallback;

1002

886

}

1003

1004

887

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

1005

888

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

1006

889

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

1036

919

1037

920

fallback:

1038

921

1039

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

1040

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

1041

occured */

922

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

923

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

1042

924

bool bret;

1043

925

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

1044

926

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

1045

size_t len = strlen(passwordbuffer);

1046

/* Strip trailing newline */

1047

if(len > 0 and passwordbuffer[len-1] == '\n'){

1048

passwordbuffer[len-1] = '\0'; /* not strictly necessary */

1049

len--;

1050

}

1051

bret = print_out_password(passwordbuffer, len);

927

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

1052

928

if(not bret){

1053

929

perror("print_out_password");

1054

930

exitstatus = EXIT_FAILURE;

1063

939

}

1064

940

1065

941

if(custom_argv != NULL){

1066

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

942

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

1067

943

free(*arg);

1068

944

}

1069

945

free(custom_argv);

1070

946

}

947

free_plugin_list(plugin_list);

1071

948

1072

949

if(dir != NULL){

1073

950

closedir(dir);

1074

951

}

1075

952

1076

953

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

1077

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

1078

if(p->pid != 0){

1079

close(p->fd);

1080

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

1081

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

1082

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

1083

perror("kill");

1084

}

954

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

955

next = process_list->next;

956

close(process_list->fd);

957

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

958

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

959

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

960

perror("kill");

1085

961

}

962

free(process_list->buffer);

963

free(process_list);

1086

964

}

1087

965

1088

966

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

1092

970

if(errno != ECHILD){

1093

971

perror("wait");

1094

972

}

1095

1096

free_plugin_list();

1097

1098

free(plugindir);

1099

free(argfile);

1100

973

1101

974

return exitstatus;

1102

975

}