/mandos/trunk : revision 182

56

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

57

argp_state, struct argp,

58

argp_parse(), ARGP_ERR_UNKNOWN,

59

ARGP_KEY_END, ARGP_KEY_ARG, error_t */

59

ARGP_KEY_END, ARGP_KEY_ARG,

60

error_t */

60

61

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

61

62

sigaddset(), sigaction(),

62

63

sigprocmask(), SIG_BLOCK, SIGCHLD,

64

65

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

65

66

67

#define BUFFER_SIZE 256

67

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

68

69

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

70

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

68

71

69

72

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

70

73

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

71

74

72

struct process;

73

74

typedef struct process{

75

pid_t pid;

76

int fd;

77

char *buffer;

78

size_t buffer_size;

79

size_t buffer_length;

80

bool eof;

81

bool completed;

82

int status;

83

struct process *next;

84

} process;

75

struct plugin;

85

76

86

77

typedef struct plugin{

87

78

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

90

81

char **environ;

91

82

int envc;

92

83

bool disabled;

84

85

/* Variables used for running processes*/

86

pid_t pid;

87

int fd;

88

char *buffer;

89

size_t buffer_size;

90

size_t buffer_length;

91

bool eof;

92

volatile bool completed;

93

volatile int status;

93

94

struct plugin *next;

94

95

} plugin;

95

96

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

97

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

97

static plugin *plugin_list = NULL;

98

99

/* Gets 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){

98

104

if ((p->name == name)

99

105

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

100

106

return p;

105

111

if (new_plugin == NULL){

106

112

return NULL;

107

113

}

108

char *copy_name = strdup(name);

109

if(copy_name == NULL){

110

return NULL;

114

char *copy_name = NULL;

115

if(name != NULL){

116

copy_name = strdup(name);

117

if(copy_name == NULL){

118

return NULL;

119

}

111

120

}

112

121

113

122

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

114

123

.argc = 1,

115

.envc = 0,

116

124

.disabled = false,

117

.next = *plugin_list };

125

.next = plugin_list };

118

126

119

127

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

120

128

if (new_plugin->argv == NULL){

129

free(copy_name);

121

130

free(new_plugin);

122

131

return NULL;

123

132

}

124

133

new_plugin->argv[0] = copy_name;

125

134

new_plugin->argv[1] = NULL;

126

135

127

136

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

128

137

if(new_plugin->environ == NULL){

138

free(copy_name);

129

139

free(new_plugin->argv);

130

140

free(new_plugin);

131

141

return NULL;

132

142

}

133

143

new_plugin->environ[0] = NULL;

144

134

145

/* Append the new plugin to the list */

135

*plugin_list = new_plugin;

146

plugin_list = new_plugin;

136

147

return new_plugin;

137

148

}

138

149

168

179

}

169

180

170

181

/* Add to a plugin's environment */

171

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

182

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

172

183

if(p == NULL){

173

184

return false;

174

185

}

186

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

187

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

188

/* Search for this environment variable */

189

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

190

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

191

/* It already exists */

192

if(replace){

193

char *new = realloc(*e, strlen(def) + 1);

194

if(new == NULL){

195

return false;

196

}

197

*e = new;

198

strcpy(*e, def);

199

}

200

return true;

201

}

202

}

175

203

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

176

204

}

177

205

178

179

206

/*

180

207

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

181

208

* Descriptor Flags".

192

219

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

193

220

}

194

221

195

process *process_list = NULL;

196

222

197

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

223

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

198

224

status. */

199

225

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

200

process *proc = process_list;

201

int status;

202

pid_t pid = wait(&status);

203

if(pid == -1){

204

perror("wait");

205

return;

206

}

207

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

208

proc = proc->next;

209

}

210

if(proc == NULL){

211

/* Process not found in process list */

212

return;

213

}

214

proc->status = status;

215

proc->completed = true;

226

while(true){

227

plugin *proc = plugin_list;

228

int status;

229

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

230

if(pid == 0){

231

/* Only still running child processes */

232

break;

233

}

234

if(pid == -1){

235

if (errno != ECHILD){

236

perror("waitpid");

237

}

238

/* No child processes */

239

break;

240

}

241

242

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

243

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

244

proc = proc->next;

245

}

246

if(proc == NULL){

247

/* Process not found in process list */

248

continue;

249

}

250

proc->status = status;

251

proc->completed = true;

252

}

216

253

}

217

254

255

/* Prints out a password to stdout */

218

256

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

219

257

ssize_t ret;

220

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

221

length--;

222

}

223

258

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

224

259

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

225

260

length - written));

230

265

return true;

231

266

}

232

267

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;

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

}

239

292

}

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;

293

}

294

295

free(plugin_node);

252

296

}

253

297

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

}

298

static void free_plugin_list(void){

299

while(plugin_list != NULL){

300

free_plugin(plugin_list);

301

}

268

302

}

269

303

270

304

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

271

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

272

const char *argfile = ARGFILE;

305

char *plugindir = NULL;

306

char *argfile = NULL;

273

307

FILE *conffp;

274

308

size_t d_name_len;

275

309

DIR *dir = NULL;

298

332

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

299

333

if(ret == -1){

300

334

perror("sigaction");

301

exitstatus = EXIT_FAILURE;

335

exitstatus = EXIT_FAILURE;

302

336

goto fallback;

303

337

}

304

338

307

341

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

308

342

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

309

343

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

310

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

344

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

311

345

.arg = "VAR=value",

312

346

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

313

347

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

314

348

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

315

349

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

316

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

350

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

317

351

.arg = "PLUGIN:ENV=value",

318

352

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

319

353

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

320

354

.arg = "PLUGIN",

321

355

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

356

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

357

.arg = "PLUGIN",

358

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

322

359

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

323

360

.arg = "DIRECTORY",

324

361

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

325

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

326

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

327

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

328

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

329

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

330

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

331

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

332

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

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 },

368

{ .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 },

333

373

{ .name = NULL }

334

374

};

335

375

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;

376

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

377

struct argp_state *state) {

340

378

switch (key) {

341

case 'g':

379

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

342

380

if (arg != NULL){

343

381

char *p;

344

382

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

345

383

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

346

384

continue;

347

385

}

348

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

386

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

349

387

perror("add_argument");

350

388

return ARGP_ERR_UNKNOWN;

351

389

}

352

390

}

353

391

}

354

392

break;

355

case 'e':

393

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

356

394

if(arg == NULL){

357

395

break;

358

396

}

359

{

360

char *envdef = strdup(arg);

361

if(envdef == NULL){

362

break;

363

}

364

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

365

perror("add_environment");

366

}

397

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

398

perror("add_environment");

367

399

}

368

400

break;

369

case 'o':

401

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

370

402

if (arg != NULL){

371

403

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

372

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

404

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

373

405

break;

374

406

}

375

407

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

376

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

408

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

377

409

break;

378

410

}

379

if(opt != NULL){

380

char *p;

381

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

382

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

383

continue;

384

}

385

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

386

perror("add_argument");

387

return ARGP_ERR_UNKNOWN;

388

}

411

char *p;

412

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

413

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

414

continue;

415

}

416

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

417

perror("add_argument");

418

return ARGP_ERR_UNKNOWN;

389

419

}

390

420

}

391

421

}

392

422

break;

393

case 'f':

423

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

394

424

if(arg == NULL){

395

425

break;

396

426

}

399

429

if(envdef == NULL){

400

430

break;

401

431

}

402

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

403

if(p_name == NULL){

404

break;

405

}

406

envdef++;

407

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

432

*envdef = '\0';

433

if(not add_environment(getplugin(arg), envdef+1, true)){

408

434

perror("add_environment");

409

435

}

410

436

}

411

437

break;

412

case 'd':

438

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

413

439

if (arg != NULL){

414

plugin *p = getplugin(arg, plugins);

440

plugin *p = getplugin(arg);

415

441

if(p == NULL){

416

442

return ARGP_ERR_UNKNOWN;

417

443

}

418

444

p->disabled = true;

419

445

}

420

446

break;

421

case 128:

422

plugindir = arg;

423

break;

424

case 129:

447

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

448

if (arg != NULL){

449

plugin *p = getplugin(arg);

450

if(p == NULL){

451

return ARGP_ERR_UNKNOWN;

452

}

453

p->disabled = false;

454

}

455

break;

456

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

457

free(plugindir);

458

plugindir = strdup(arg);

459

if(plugindir == NULL){

460

perror("strdup");

461

}

462

break;

463

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

464

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

465

break;

466

case 130: /* --userid */

425

467

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

426

468

break;

427

case 130:

469

case 131: /* --groupid */

428

470

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

429

471

break;

430

case 131:

472

case 132: /* --debug */

431

473

debug = true;

432

474

break;

433

475

case ARGP_KEY_ARG:

434

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

435

break;

436

case ARGP_KEY_END:

437

break;

438

default:

439

return ARGP_ERR_UNKNOWN;

440

}

441

return 0;

442

}

443

444

plugin *plugin_list = NULL;

445

446

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

447

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

476

/* Cryptsetup always passes an argument, which is an empty

477

string if "none" was specified in /etc/crypttab. So if

478

argument was empty, we ignore it silently. */

479

if(arg[0] != '\0'){

480

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

481

}

482

break;

483

case ARGP_KEY_END:

484

break;

485

default:

486

return ARGP_ERR_UNKNOWN;

487

}

488

return 0;

489

}

490

491

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

492

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

493

error_t parse_opt_config_file (int key, char *arg,

494

__attribute__((unused))

495

struct argp_state *state) {

496

switch (key) {

497

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

498

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

499

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

500

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

501

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

502

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

503

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

504

break;

505

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

506

free(argfile);

507

argfile = strdup(arg);

508

if(argfile == NULL){

509

perror("strdup");

510

}

511

break;

512

case 130: /* --userid */

513

case 131: /* --groupid */

514

case 132: /* --debug */

515

case ARGP_KEY_ARG:

516

case ARGP_KEY_END:

517

break;

518

default:

519

return ARGP_ERR_UNKNOWN;

520

}

521

return 0;

522

}

523

524

struct argp argp = { .options = options,

525

.parser = parse_opt_config_file,

526

.args_doc = "",

448

527

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

449

528

450

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

529

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

530

config file location, if any. */

531

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

451

532

if (ret == ARGP_ERR_UNKNOWN){

452

533

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

453

534

exitstatus = EXIT_FAILURE;

454

535

goto fallback;

455

536

}

456

457

conffp = fopen(argfile, "r");

537

538

/* Reset to the normal argument parser */

539

argp.parser = parse_opt;

540

541

/* Open the configfile if available */

542

if (argfile == NULL){

543

conffp = fopen(AFILE, "r");

544

} else {

545

conffp = fopen(argfile, "r");

546

}

458

547

if(conffp != NULL){

459

548

char *org_line = NULL;

460

549

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

463

552

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

464

553

const char comment_delim[] = "#";

465

554

555

custom_argc = 1;

556

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

557

if(custom_argv == NULL){

558

perror("malloc");

559

exitstatus = EXIT_FAILURE;

560

goto fallback;

561

}

562

custom_argv[0] = argv[0];

563

custom_argv[1] = NULL;

564

565

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

566

commented text */

466

567

while(true){

467

568

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

468

569

if(sret == -1){

476

577

continue;

477

578

}

478

579

new_arg = strdup(p);

479

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

480

if (custom_argv == NULL){

481

perror("add_to_argv");

482

exitstatus = EXIT_FAILURE;

483

goto fallback;

484

}

580

if(new_arg == NULL){

581

perror("strdup");

582

exitstatus = EXIT_FAILURE;

583

free(org_line);

584

goto fallback;

585

}

586

587

custom_argc += 1;

588

custom_argv = realloc(custom_argv, sizeof(char *)

589

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

590

if(custom_argv == NULL){

591

perror("realloc");

592

exitstatus = EXIT_FAILURE;

593

free(org_line);

594

goto fallback;

595

}

596

custom_argv[custom_argc-1] = new_arg;

597

custom_argv[custom_argc] = NULL;

485

598

}

486

599

}

487

600

free(org_line);

488

} else{

601

} else {

489

602

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

490

603

not affect opening plugins */

491

604

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

494

607

goto fallback;

495

608

}

496

609

}

497

610

/* If there was any arguments from configuration file,

611

pass them to parser as command arguments */

498

612

if(custom_argv != NULL){

499

custom_argv[0] = argv[0];

500

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

613

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

614

0, NULL);

501

615

if (ret == ARGP_ERR_UNKNOWN){

502

616

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

503

617

exitstatus = EXIT_FAILURE;

505

619

}

506

620

}

507

621

622

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

623

config file */

624

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

625

if (ret == ARGP_ERR_UNKNOWN){

626

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

627

exitstatus = EXIT_FAILURE;

628

goto fallback;

629

}

630

508

631

if(debug){

509

632

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

510

633

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

519

642

}

520

643

}

521

644

645

/* Strip permissions down to nobody */

522

646

ret = setuid(uid);

523

647

if (ret == -1){

524

648

perror("setuid");

525

}

526

649

}

527

650

setgid(gid);

528

651

if (ret == -1){

529

652

perror("setgid");

530

653

}

531

654

532

dir = opendir(plugindir);

655

if (plugindir == NULL){

656

dir = opendir(PDIR);

657

} else {

658

dir = opendir(plugindir);

659

}

660

533

661

if(dir == NULL){

534

662

perror("Could not open plugin dir");

535

663

exitstatus = EXIT_FAILURE;

551

679

552

680

FD_ZERO(&rfds_all);

553

681

682

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

554

683

while(true){

555

684

dirst = readdir(dir);

556

685

557

// All directory entries have been processed

686

/* All directory entries have been processed */

558

687

if(dirst == NULL){

559

688

if (errno == EBADF){

560

689

perror("readdir");

566

695

567

696

d_name_len = strlen(dirst->d_name);

568

697

569

// Ignore dotfiles, backup files and other junk

698

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

570

699

{

571

700

bool bad_name = false;

572

701

587

716

break;

588

717

}

589

718

}

590

591

719

if(bad_name){

592

720

continue;

593

721

}

594

595

722

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

596

723

size_t suf_len = strlen(*suf);

597

724

if((d_name_len >= suf_len)

612

739

}

613

740

614

741

char *filename;

615

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

742

if(plugindir == NULL){

743

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

744

} else {

745

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

746

}

616

747

if(ret < 0){

617

748

perror("asprintf");

618

749

continue;

624

755

free(filename);

625

756

continue;

626

757

}

627

758

759

/* Ignore non-executable files */

628

760

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

629

761

if(debug){

630

762

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

633

765

free(filename);

634

766

continue;

635

767

}

636

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

768

769

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

637

770

if(p == NULL){

638

771

perror("getplugin");

639

772

free(filename);

649

782

}

650

783

{

651

784

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

652

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

785

plugin *g = getplugin(NULL);

653

786

if(g != NULL){

654

787

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

655

788

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

658

791

}

659

792

/* Add global environment variables */

660

793

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

661

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

794

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

662

795

perror("add_environment");

663

796

}

664

797

}

669

802

process, too. */

670

803

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

671

804

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

672

char *copy = strdup(*e);

673

if(copy == NULL){

674

perror("strdup");

675

continue;

676

}

677

if(not add_environment(p, copy)){

805

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

678

806

perror("add_environment");

679

807

}

680

808

}

681

809

}

682

810

683

int pipefd[2];

811

int pipefd[2];

684

812

ret = pipe(pipefd);

685

813

if (ret == -1){

686

814

perror("pipe");

687

815

exitstatus = EXIT_FAILURE;

688

816

goto fallback;

689

817

}

818

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

690

819

ret = set_cloexec_flag(pipefd[0]);

691

820

if(ret < 0){

692

821

perror("set_cloexec_flag");

706

835

exitstatus = EXIT_FAILURE;

707

836

goto fallback;

708

837

}

709

// Starting a new process to be watched

838

/* Starting a new process to be watched */

710

839

pid_t pid = fork();

711

840

if(pid == -1){

712

841

perror("fork");

750

879

}

751

880

/* no return */

752

881

}

753

/* parent process */

882

/* Parent process */

883

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

754

884

free(filename);

755

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

756

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

757

if (new_process == NULL){

758

perror("malloc");

885

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

886

if (new_plugin == NULL){

887

perror("getplugin");

759

888

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

760

889

if(ret < 0){

761

perror("sigprocmask");

890

perror("sigprocmask");

762

891

}

763

892

exitstatus = EXIT_FAILURE;

764

893

goto fallback;

765

894

}

766

895

767

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

768

.fd = pipefd[0],

769

.next = process_list };

770

// List handling

771

process_list = new_process;

896

new_plugin->pid = pid;

897

new_plugin->fd = pipefd[0];

898

772

899

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

773

900

has already completed */

774

901

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

778

905

goto fallback;

779

906

}

780

907

781

FD_SET(new_process->fd, &rfds_all);

908

FD_SET(new_plugin->fd, &rfds_all);

782

909

783

if (maxfd < new_process->fd){

784

maxfd = new_process->fd;

910

if (maxfd < new_plugin->fd){

911

maxfd = new_plugin->fd;

785

912

}

786

913

787

914

}

788

915

789

free_plugin_list(plugin_list);

790

791

916

closedir(dir);

792

917

dir = NULL;

793

794

if (process_list == NULL){

795

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

796

" directory?\n");

797

process_list = NULL;

918

919

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

920

if(p->pid != 0){

921

break;

922

}

923

if(p->next == NULL){

924

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

925

" directory?\n");

926

free_plugin_list();

927

}

798

928

}

799

while(process_list){

929

930

/* Main loop while running plugins exist */

931

while(plugin_list){

800

932

fd_set rfds = rfds_all;

801

933

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

802

934

if (select_ret == -1){

806

938

}

807

939

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

808

940

from one of them */

809

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

941

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

810

942

/* Is this process completely done? */

811

943

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

812

944

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

813

945

if(not WIFEXITED(proc->status)

814

946

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

815

947

/* Bad exit by plugin */

948

816

949

if(debug){

817

950

if(WIFEXITED(proc->status)){

818

951

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

827

960

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

828

961

}

829

962

}

963

830

964

/* Remove the plugin */

831

965

FD_CLR(proc->fd, &rfds_all);

966

832

967

/* Block signal while modifying process_list */

833

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

968

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

834

969

if(ret < 0){

835

970

perror("sigprocmask");

836

971

exitstatus = EXIT_FAILURE;

837

972

goto fallback;

838

973

}

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

}

974

852

975

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

853

976

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

854

977

NULL);

855

978

if(ret < 0){

856

979

perror("sigprocmask");

857

}

858

free(proc->buffer);

859

free(proc);

860

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

861

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

862

the process list */

863

break;

980

exitstatus = EXIT_FAILURE;

981

goto fallback;

982

}

983

984

if(plugin_list == NULL){

985

break;

986

}

987

988

plugin *next_plugin = proc->next;

989

free_plugin(proc);

990

proc = next_plugin;

991

continue;

864

992

}

993

865

994

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

866

995

867

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

996

bool bret = print_out_password(proc->buffer,

997

proc->buffer_length);

868

998

if(not bret){

869

999

perror("print_out_password");

870

1000

exitstatus = EXIT_FAILURE;

871

1001

}

872

1002

goto fallback;

873

1003

}

1004

874

1005

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

875

1006

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

876

1007

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

1008

proc = proc->next;

877

1009

continue;

878

1010

}

879

1011

/* Before reading, make the process' data buffer large enough */

892

1024

BUFFER_SIZE);

893

1025

if(ret < 0){

894

1026

/* Read error from this process; ignore the error */

1027

proc = proc->next;

895

1028

continue;

896

1029

}

897

1030

if(ret == 0){

906

1039

907

1040

fallback:

908

1041

909

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

910

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

1042

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

1043

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

1044

occured */

911

1045

bool bret;

912

1046

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

913

1047

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

914

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

1048

size_t len = strlen(passwordbuffer);

1049

/* Strip trailing newline */

1050

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

1051

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

1052

len--;

1053

}

1054

bret = print_out_password(passwordbuffer, len);

915

1055

if(not bret){

916

1056

perror("print_out_password");

917

1057

exitstatus = EXIT_FAILURE;

926

1066

}

927

1067

928

1068

if(custom_argv != NULL){

929

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

1069

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

930

1070

free(*arg);

931

1071

}

932

1072

free(custom_argv);

933

1073

}

934

free_plugin_list(plugin_list);

935

1074

936

1075

if(dir != NULL){

937

1076

closedir(dir);

938

1077

}

939

1078

940

1079

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

941

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

942

next = process_list->next;

943

close(process_list->fd);

944

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

945

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

946

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

947

perror("kill");

1080

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

1081

if(p->pid != 0){

1082

close(p->fd);

1083

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

1084

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

1085

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

1086

perror("kill");

1087

}

948

1088

}

949

free(process_list->buffer);

950

free(process_list);

951

1089

}

952

1090

953

1091

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

957

1095

if(errno != ECHILD){

958

1096

perror("wait");

959

1097

}

1098

1099

free_plugin_list();

1100

1101

free(plugindir);

1102

free(argfile);

960

1103

961

1104

return exitstatus;

962

1105

}