/mandos/trunk : revision 101

56

#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 */

59

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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66

#define BUFFER_SIZE 256

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#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

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struct plugin;

72

struct process;

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74

typedef struct process{

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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;

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} process;

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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;

82

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;

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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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volatile bool completed;

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volatile int status;

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struct plugin *next;

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} plugin;

96

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static plugin *plugin_list = NULL;

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/* Gets a existing plugin based on name,

100

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

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static plugin *getplugin(char *name){

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/* 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){

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

104

98

if ((p->name == name)

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99

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

106

100

return p;

118

112

return NULL;

119

113

}

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114

}

121

115

122

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

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117

.argc = 1,

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.envc = 0,

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119

.disabled = false,

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.next = plugin_list };

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.next = *plugin_list };

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121

127

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

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123

if (new_plugin->argv == NULL){

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127

}

133

128

new_plugin->argv[0] = copy_name;

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129

new_plugin->argv[1] = NULL;

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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;

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137

}

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138

new_plugin->environ[0] = NULL;

144

145

139

/* Append the new plugin to the list */

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plugin_list = new_plugin;

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*plugin_list = new_plugin;

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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){

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177

if(p == NULL){

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178

return false;

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179

}

186

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

187

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

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/* Search for this environment variable */

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

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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

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".

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197

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

220

198

}

221

199

200

process *process_list = NULL;

222

201

223

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

202

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

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203

status. */

225

204

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

}

205

process *proc = process_list;

206

int status;

207

pid_t pid = wait(&status);

208

if(pid == -1){

209

perror("wait");

210

return;

211

}

212

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

213

proc = proc->next;

214

}

215

if(proc == NULL){

216

/* Process not found in process list */

217

return;

218

}

219

proc->status = status;

220

proc->completed = true;

253

221

}

254

222

255

/* Prints out a password to stdout */

256

223

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

257

224

ssize_t ret;

258

225

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

268

235

return true;

269

236

}

270

237

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

}

238

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

239

if (argv == NULL){

240

*argc = 1;

241

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

242

if(argv == NULL){

243

return NULL;

295

244

}

296

}

297

298

free(plugin_node);

245

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

246

argv[1] = NULL;

247

}

248

*argc += 1;

249

argv = realloc(argv, sizeof(char *)

250

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

251

if(argv == NULL){

252

return NULL;

253

}

254

argv[*argc-1] = arg;

255

argv[*argc] = NULL;

256

return argv;

299

257

}

300

258

301

static void free_plugin_list(void){

302

while(plugin_list != NULL){

303

free_plugin(plugin_list);

259

static void free_plugin_list(plugin *plugin_list){

260

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

261

next = plugin_list->next;

262

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

263

free(*arg);

264

}

265

free(plugin_list->argv);

266

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

267

free(*env);

268

}

269

free(plugin_list->environ);

270

free(plugin_list);

304

271

}

305

272

}

306

273

307

274

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

308

char *plugindir = NULL;

309

char *argfile = NULL;

275

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

276

const char *argfile = ARGFILE;

310

277

FILE *conffp;

311

278

size_t d_name_len;

312

279

DIR *dir = NULL;

344

311

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

345

312

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

346

313

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

347

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

314

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

348

315

.arg = "VAR=value",

349

316

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

350

317

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

351

318

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

352

319

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

353

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

320

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

354

321

.arg = "PLUGIN:ENV=value",

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322

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

356

323

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

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324

.arg = "PLUGIN",

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325

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

359

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

360

.arg = "PLUGIN",

361

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

362

326

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

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327

.arg = "DIRECTORY",

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328

.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 },

329

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

330

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

331

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

332

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

333

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

334

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

335

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

336

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

376

337

{ .name = NULL }

377

338

};

378

339

379

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

380

struct argp_state *state) {

340

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

341

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

342

pointer to our plugin list pointer. */

343

plugin **plugins = state->input;

381

344

switch (key) {

382

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

345

case 'g':

383

346

if (arg != NULL){

384

347

char *p;

385

348

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

386

349

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

387

350

continue;

388

351

}

389

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

352

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

390

353

perror("add_argument");

391

354

return ARGP_ERR_UNKNOWN;

392

355

}

393

356

}

394

357

}

395

358

break;

396

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

359

case 'e':

397

360

if(arg == NULL){

398

361

break;

399

362

}

402

365

if(envdef == NULL){

403

366

break;

404

367

}

405

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

368

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

406

369

perror("add_environment");

407

370

}

408

371

}

409

372

break;

410

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

373

case 'o':

411

374

if (arg != NULL){

412

375

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

413

376

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

423

386

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

424

387

continue;

425

388

}

426

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

389

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

427

390

perror("add_argument");

428

391

return ARGP_ERR_UNKNOWN;

429

392

}

431

394

}

432

395

}

433

396

break;

434

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

397

case 'f':

435

398

if(arg == NULL){

436

399

break;

437

400

}

445

408

break;

446

409

}

447

410

envdef++;

448

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

411

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

449

412

perror("add_environment");

450

413

}

451

414

}

452

415

break;

453

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

416

case 'd':

454

417

if (arg != NULL){

455

plugin *p = getplugin(arg);

418

plugin *p = getplugin(arg, plugins);

456

419

if(p == NULL){

457

420

return ARGP_ERR_UNKNOWN;

458

421

}

459

422

p->disabled = true;

460

423

}

461

424

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 */

425

case 128:

426

plugindir = arg;

427

break;

428

case 129:

481

429

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

482

430

break;

483

case 131: /* --groupid */

431

case 130:

484

432

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

485

433

break;

486

case 132: /* --debug */

434

case 131:

487

435

debug = true;

488

436

break;

489

437

case ARGP_KEY_ARG:

497

445

return 0;

498

446

}

499

447

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

}

448

plugin *plugin_list = NULL;

531

449

532

struct argp argp = { .options = options,

533

.parser = parse_opt_config_file,

534

.args_doc = "",

450

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

451

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

535

452

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

536

453

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);

454

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

540

455

if (ret == ARGP_ERR_UNKNOWN){

541

456

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

542

457

exitstatus = EXIT_FAILURE;

543

458

goto fallback;

544

459

}

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

}

460

461

conffp = fopen(argfile, "r");

555

462

if(conffp != NULL){

556

463

char *org_line = NULL;

557

464

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

560

467

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

561

468

const char comment_delim[] = "#";

562

469

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

470

while(true){

576

471

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

577

472

if(sret == -1){

585

480

continue;

586

481

}

587

482

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;

483

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

484

if (custom_argv == NULL){

485

perror("add_to_argv");

486

exitstatus = EXIT_FAILURE;

487

goto fallback;

488

}

606

489

}

607

490

}

608

491

free(org_line);

609

} else {

492

} else{

610

493

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

611

494

not affect opening plugins */

612

495

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

615

498

goto fallback;

616

499

}

617

500

}

618

/* If there was any arguments from configuration file,

619

pass them to parser as command arguments */

501

620

502

if(custom_argv != NULL){

621

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

622

0, NULL);

503

custom_argv[0] = argv[0];

504

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

623

505

if (ret == ARGP_ERR_UNKNOWN){

624

506

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

625

507

exitstatus = EXIT_FAILURE;

627

509

}

628

510

}

629

511

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

512

if(debug){

640

513

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

641

514

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

650

523

}

651

524

}

652

525

653

/* Strip permissions down to nobody */

654

526

ret = setuid(uid);

655

527

if (ret == -1){

656

528

perror("setuid");

657

}

529

}

530

658

531

setgid(gid);

659

532

if (ret == -1){

660

533

perror("setgid");

661

534

}

662

535

663

if (plugindir == NULL){

664

dir = opendir(PDIR);

665

} else {

666

dir = opendir(plugindir);

667

}

668

536

dir = opendir(plugindir);

669

537

if(dir == NULL){

670

538

perror("Could not open plugin dir");

671

539

exitstatus = EXIT_FAILURE;

687

555

688

556

FD_ZERO(&rfds_all);

689

557

690

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

691

558

while(true){

692

559

dirst = readdir(dir);

693

560

694

/* All directory entries have been processed */

561

// All directory entries have been processed

695

562

if(dirst == NULL){

696

563

if (errno == EBADF){

697

564

perror("readdir");

703

570

704

571

d_name_len = strlen(dirst->d_name);

705

572

706

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

573

// Ignore dotfiles, backup files and other junk

707

574

{

708

575

bool bad_name = false;

709

576

724

591

break;

725

592

}

726

593

}

594

727

595

if(bad_name){

728

596

continue;

729

597

}

598

730

599

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

731

600

size_t suf_len = strlen(*suf);

732

601

if((d_name_len >= suf_len)

759

628

free(filename);

760

629

continue;

761

630

}

762

763

/* Ignore non-executable files */

631

764

632

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

765

633

if(debug){

766

634

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

769

637

free(filename);

770

638

continue;

771

639

}

772

773

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

640

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

774

641

if(p == NULL){

775

642

perror("getplugin");

776

643

free(filename);

786

653

}

787

654

{

788

655

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

789

plugin *g = getplugin(NULL);

656

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

790

657

if(g != NULL){

791

658

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

792

659

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

795

662

}

796

663

/* Add global environment variables */

797

664

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

798

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

665

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

799

666

perror("add_environment");

800

667

}

801

668

}

806

673

process, too. */

807

674

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

808

675

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

809

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

676

char *copy = strdup(*e);

677

if(copy == NULL){

678

perror("strdup");

679

continue;

680

}

681

if(not add_environment(p, copy)){

810

682

perror("add_environment");

811

683

}

812

684

}

819

691

exitstatus = EXIT_FAILURE;

820

692

goto fallback;

821

693

}

822

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

823

694

ret = set_cloexec_flag(pipefd[0]);

824

695

if(ret < 0){

825

696

perror("set_cloexec_flag");

839

710

exitstatus = EXIT_FAILURE;

840

711

goto fallback;

841

712

}

842

/* Starting a new process to be watched */

713

// Starting a new process to be watched

843

714

pid_t pid = fork();

844

715

if(pid == -1){

845

716

perror("fork");

883

754

}

884

755

/* no return */

885

756

}

886

/* Parent process */

887

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

757

/* parent process */

888

758

free(filename);

889

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

890

if (new_plugin == NULL){

891

perror("getplugin");

759

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

760

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

761

if (new_process == NULL){

762

perror("malloc");

892

763

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

893

764

if(ret < 0){

894

perror("sigprocmask");

765

perror("sigprocmask");

895

766

}

896

767

exitstatus = EXIT_FAILURE;

897

768

goto fallback;

898

769

}

899

770

900

new_plugin->pid = pid;

901

new_plugin->fd = pipefd[0];

902

771

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

772

.fd = pipefd[0],

773

.next = process_list };

774

// List handling

775

process_list = new_process;

903

776

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

904

777

has already completed */

905

778

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

909

782

goto fallback;

910

783

}

911

784

912

FD_SET(new_plugin->fd, &rfds_all);

785

FD_SET(new_process->fd, &rfds_all);

913

786

914

if (maxfd < new_plugin->fd){

915

maxfd = new_plugin->fd;

787

if (maxfd < new_process->fd){

788

maxfd = new_process->fd;

916

789

}

917

790

918

791

}

919

792

793

free_plugin_list(plugin_list);

794

plugin_list = NULL;

795

920

796

closedir(dir);

921

797

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

}

798

799

if (process_list == NULL){

800

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

801

" directory?\n");

802

process_list = NULL;

932

803

}

933

934

/* Main loop while running plugins exist */

935

while(plugin_list){

804

while(process_list){

936

805

fd_set rfds = rfds_all;

937

806

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

938

807

if (select_ret == -1){

942

811

}

943

812

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

944

813

from one of them */

945

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

814

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

946

815

/* Is this process completely done? */

947

816

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

948

817

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

949

818

if(not WIFEXITED(proc->status)

950

819

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

951

820

/* Bad exit by plugin */

952

953

821

if(debug){

954

822

if(WIFEXITED(proc->status)){

955

823

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

964

832

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

965

833

}

966

834

}

967

968

835

/* Remove the plugin */

969

836

FD_CLR(proc->fd, &rfds_all);

970

971

837

/* Block signal while modifying process_list */

972

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

838

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

973

839

if(ret < 0){

974

840

perror("sigprocmask");

975

841

exitstatus = EXIT_FAILURE;

976

842

goto fallback;

977

843

}

978

free_plugin(proc);

844

/* Delete this process entry from the list */

845

if(process_list == proc){

846

/* First one - simple */

847

process_list = proc->next;

848

} else {

849

/* Second one or later */

850

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

851

if(p->next == proc){

852

p->next = proc->next;

853

break;

854

}

855

}

856

}

979

857

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

980

858

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

981

859

NULL);

982

860

if(ret < 0){

983

861

perror("sigprocmask");

984

exitstatus = EXIT_FAILURE;

985

goto fallback;

986

}

987

988

if(plugin_list == NULL){

989

break;

990

}

991

continue;

862

}

863

free(proc->buffer);

864

free(proc);

865

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

866

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

867

the process list */

868

break;

992

869

}

993

994

870

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

995

871

996

bool bret = print_out_password(proc->buffer,

997

proc->buffer_length);

872

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

998

873

if(not bret){

999

874

perror("print_out_password");

1000

875

exitstatus = EXIT_FAILURE;

1001

876

}

1002

877

goto fallback;

1003

878

}

1004

1005

879

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

1006

880

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

1007

881

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

1037

911

1038

912

fallback:

1039

913

1040

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

1041

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

1042

occured */

914

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

915

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

1043

916

bool bret;

1044

917

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

1045

918

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

1058

931

}

1059

932

1060

933

if(custom_argv != NULL){

1061

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

934

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

1062

935

free(*arg);

1063

936

}

1064

937

free(custom_argv);

1065

938

}

939

free_plugin_list(plugin_list);

1066

940

1067

941

if(dir != NULL){

1068

942

closedir(dir);

1069

943

}

1070

944

1071

945

/* 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

}

946

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

947

next = process_list->next;

948

close(process_list->fd);

949

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

950

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

951

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

952

perror("kill");

1080

953

}

954

free(process_list->buffer);

955

free(process_list);

1081

956

}

1082

957

1083

958

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

1087

962

if(errno != ECHILD){

1088

963

perror("wait");

1089

964

}

1090

1091

free_plugin_list();

1092

1093

free(plugindir);

1094

free(argfile);

1095

965

1096

966

return exitstatus;

1097

967

}